1 /* Xtensa-specific support for 32-bit ELF.
2 Copyright 2003, 2004, 2005, 2006, 2007 Free Software Foundation, Inc.
4 This file is part of BFD, the Binary File Descriptor library.
6 This program is free software; you can redistribute it and/or
7 modify it under the terms of the GNU General Public License as
8 published by the Free Software Foundation; either version 2 of the
9 License, or (at your option) any later version.
11 This program is distributed in the hope that it will be useful, but
12 WITHOUT ANY WARRANTY; without even the implied warranty of
13 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
14 General Public License for more details.
16 You should have received a copy of the GNU General Public License
17 along with this program; if not, write to the Free Software
18 Foundation, Inc., 51 Franklin Street - Fifth Floor, Boston, MA
30 #include "elf/xtensa.h"
31 #include "xtensa-isa.h"
32 #include "xtensa-config.h"
34 #define XTENSA_NO_NOP_REMOVAL 0
36 /* Local helper functions. */
38 static bfd_boolean
add_extra_plt_sections (struct bfd_link_info
*, int);
39 static char *vsprint_msg (const char *, const char *, int, ...) ATTRIBUTE_PRINTF(2,4);
40 static bfd_reloc_status_type bfd_elf_xtensa_reloc
41 (bfd
*, arelent
*, asymbol
*, void *, asection
*, bfd
*, char **);
42 static bfd_boolean do_fix_for_relocatable_link
43 (Elf_Internal_Rela
*, bfd
*, asection
*, bfd_byte
*);
44 static void do_fix_for_final_link
45 (Elf_Internal_Rela
*, bfd
*, asection
*, bfd_byte
*, bfd_vma
*);
47 /* Local functions to handle Xtensa configurability. */
49 static bfd_boolean
is_indirect_call_opcode (xtensa_opcode
);
50 static bfd_boolean
is_direct_call_opcode (xtensa_opcode
);
51 static bfd_boolean
is_windowed_call_opcode (xtensa_opcode
);
52 static xtensa_opcode
get_const16_opcode (void);
53 static xtensa_opcode
get_l32r_opcode (void);
54 static bfd_vma
l32r_offset (bfd_vma
, bfd_vma
);
55 static int get_relocation_opnd (xtensa_opcode
, int);
56 static int get_relocation_slot (int);
57 static xtensa_opcode get_relocation_opcode
58 (bfd
*, asection
*, bfd_byte
*, Elf_Internal_Rela
*);
59 static bfd_boolean is_l32r_relocation
60 (bfd
*, asection
*, bfd_byte
*, Elf_Internal_Rela
*);
61 static bfd_boolean
is_alt_relocation (int);
62 static bfd_boolean
is_operand_relocation (int);
63 static bfd_size_type insn_decode_len
64 (bfd_byte
*, bfd_size_type
, bfd_size_type
);
65 static xtensa_opcode insn_decode_opcode
66 (bfd_byte
*, bfd_size_type
, bfd_size_type
, int);
67 static bfd_boolean check_branch_target_aligned
68 (bfd_byte
*, bfd_size_type
, bfd_vma
, bfd_vma
);
69 static bfd_boolean check_loop_aligned
70 (bfd_byte
*, bfd_size_type
, bfd_vma
, bfd_vma
);
71 static bfd_boolean
check_branch_target_aligned_address (bfd_vma
, int);
72 static bfd_size_type get_asm_simplify_size
73 (bfd_byte
*, bfd_size_type
, bfd_size_type
);
75 /* Functions for link-time code simplifications. */
77 static bfd_reloc_status_type elf_xtensa_do_asm_simplify
78 (bfd_byte
*, bfd_vma
, bfd_vma
, char **);
79 static bfd_reloc_status_type contract_asm_expansion
80 (bfd_byte
*, bfd_vma
, Elf_Internal_Rela
*, char **);
81 static xtensa_opcode
swap_callx_for_call_opcode (xtensa_opcode
);
82 static xtensa_opcode
get_expanded_call_opcode (bfd_byte
*, int, bfd_boolean
*);
84 /* Access to internal relocations, section contents and symbols. */
86 static Elf_Internal_Rela
*retrieve_internal_relocs
87 (bfd
*, asection
*, bfd_boolean
);
88 static void pin_internal_relocs (asection
*, Elf_Internal_Rela
*);
89 static void release_internal_relocs (asection
*, Elf_Internal_Rela
*);
90 static bfd_byte
*retrieve_contents (bfd
*, asection
*, bfd_boolean
);
91 static void pin_contents (asection
*, bfd_byte
*);
92 static void release_contents (asection
*, bfd_byte
*);
93 static Elf_Internal_Sym
*retrieve_local_syms (bfd
*);
95 /* Miscellaneous utility functions. */
97 static asection
*elf_xtensa_get_plt_section (struct bfd_link_info
*, int);
98 static asection
*elf_xtensa_get_gotplt_section (struct bfd_link_info
*, int);
99 static asection
*get_elf_r_symndx_section (bfd
*, unsigned long);
100 static struct elf_link_hash_entry
*get_elf_r_symndx_hash_entry
101 (bfd
*, unsigned long);
102 static bfd_vma
get_elf_r_symndx_offset (bfd
*, unsigned long);
103 static bfd_boolean
is_reloc_sym_weak (bfd
*, Elf_Internal_Rela
*);
104 static bfd_boolean
pcrel_reloc_fits (xtensa_opcode
, int, bfd_vma
, bfd_vma
);
105 static bfd_boolean
xtensa_is_property_section (asection
*);
106 static bfd_boolean
xtensa_is_insntable_section (asection
*);
107 static bfd_boolean
xtensa_is_littable_section (asection
*);
108 static bfd_boolean
xtensa_is_proptable_section (asection
*);
109 static int internal_reloc_compare (const void *, const void *);
110 static int internal_reloc_matches (const void *, const void *);
111 extern asection
*xtensa_get_property_section (asection
*, const char *);
112 static flagword
xtensa_get_property_predef_flags (asection
*);
114 /* Other functions called directly by the linker. */
116 typedef void (*deps_callback_t
)
117 (asection
*, bfd_vma
, asection
*, bfd_vma
, void *);
118 extern bfd_boolean xtensa_callback_required_dependence
119 (bfd
*, asection
*, struct bfd_link_info
*, deps_callback_t
, void *);
122 /* Globally visible flag for choosing size optimization of NOP removal
123 instead of branch-target-aware minimization for NOP removal.
124 When nonzero, narrow all instructions and remove all NOPs possible
125 around longcall expansions. */
127 int elf32xtensa_size_opt
;
130 /* The "new_section_hook" is used to set up a per-section
131 "xtensa_relax_info" data structure with additional information used
132 during relaxation. */
134 typedef struct xtensa_relax_info_struct xtensa_relax_info
;
137 /* The GNU tools do not easily allow extending interfaces to pass around
138 the pointer to the Xtensa ISA information, so instead we add a global
139 variable here (in BFD) that can be used by any of the tools that need
142 xtensa_isa xtensa_default_isa
;
145 /* When this is true, relocations may have been modified to refer to
146 symbols from other input files. The per-section list of "fix"
147 records needs to be checked when resolving relocations. */
149 static bfd_boolean relaxing_section
= FALSE
;
151 /* When this is true, during final links, literals that cannot be
152 coalesced and their relocations may be moved to other sections. */
154 int elf32xtensa_no_literal_movement
= 1;
157 static reloc_howto_type elf_howto_table
[] =
159 HOWTO (R_XTENSA_NONE
, 0, 0, 0, FALSE
, 0, complain_overflow_dont
,
160 bfd_elf_xtensa_reloc
, "R_XTENSA_NONE",
162 HOWTO (R_XTENSA_32
, 0, 2, 32, FALSE
, 0, complain_overflow_bitfield
,
163 bfd_elf_xtensa_reloc
, "R_XTENSA_32",
164 TRUE
, 0xffffffff, 0xffffffff, FALSE
),
166 /* Replace a 32-bit value with a value from the runtime linker (only
167 used by linker-generated stub functions). The r_addend value is
168 special: 1 means to substitute a pointer to the runtime linker's
169 dynamic resolver function; 2 means to substitute the link map for
170 the shared object. */
171 HOWTO (R_XTENSA_RTLD
, 0, 2, 32, FALSE
, 0, complain_overflow_dont
,
172 NULL
, "R_XTENSA_RTLD", FALSE
, 0, 0, FALSE
),
174 HOWTO (R_XTENSA_GLOB_DAT
, 0, 2, 32, FALSE
, 0, complain_overflow_bitfield
,
175 bfd_elf_generic_reloc
, "R_XTENSA_GLOB_DAT",
176 FALSE
, 0, 0xffffffff, FALSE
),
177 HOWTO (R_XTENSA_JMP_SLOT
, 0, 2, 32, FALSE
, 0, complain_overflow_bitfield
,
178 bfd_elf_generic_reloc
, "R_XTENSA_JMP_SLOT",
179 FALSE
, 0, 0xffffffff, FALSE
),
180 HOWTO (R_XTENSA_RELATIVE
, 0, 2, 32, FALSE
, 0, complain_overflow_bitfield
,
181 bfd_elf_generic_reloc
, "R_XTENSA_RELATIVE",
182 FALSE
, 0, 0xffffffff, FALSE
),
183 HOWTO (R_XTENSA_PLT
, 0, 2, 32, FALSE
, 0, complain_overflow_bitfield
,
184 bfd_elf_xtensa_reloc
, "R_XTENSA_PLT",
185 FALSE
, 0, 0xffffffff, FALSE
),
189 /* Old relocations for backward compatibility. */
190 HOWTO (R_XTENSA_OP0
, 0, 0, 0, TRUE
, 0, complain_overflow_dont
,
191 bfd_elf_xtensa_reloc
, "R_XTENSA_OP0", FALSE
, 0, 0, TRUE
),
192 HOWTO (R_XTENSA_OP1
, 0, 0, 0, TRUE
, 0, complain_overflow_dont
,
193 bfd_elf_xtensa_reloc
, "R_XTENSA_OP1", FALSE
, 0, 0, TRUE
),
194 HOWTO (R_XTENSA_OP2
, 0, 0, 0, TRUE
, 0, complain_overflow_dont
,
195 bfd_elf_xtensa_reloc
, "R_XTENSA_OP2", FALSE
, 0, 0, TRUE
),
197 /* Assembly auto-expansion. */
198 HOWTO (R_XTENSA_ASM_EXPAND
, 0, 0, 0, TRUE
, 0, complain_overflow_dont
,
199 bfd_elf_xtensa_reloc
, "R_XTENSA_ASM_EXPAND", FALSE
, 0, 0, TRUE
),
200 /* Relax assembly auto-expansion. */
201 HOWTO (R_XTENSA_ASM_SIMPLIFY
, 0, 0, 0, TRUE
, 0, complain_overflow_dont
,
202 bfd_elf_xtensa_reloc
, "R_XTENSA_ASM_SIMPLIFY", FALSE
, 0, 0, TRUE
),
207 /* GNU extension to record C++ vtable hierarchy. */
208 HOWTO (R_XTENSA_GNU_VTINHERIT
, 0, 2, 0, FALSE
, 0, complain_overflow_dont
,
209 NULL
, "R_XTENSA_GNU_VTINHERIT",
211 /* GNU extension to record C++ vtable member usage. */
212 HOWTO (R_XTENSA_GNU_VTENTRY
, 0, 2, 0, FALSE
, 0, complain_overflow_dont
,
213 _bfd_elf_rel_vtable_reloc_fn
, "R_XTENSA_GNU_VTENTRY",
216 /* Relocations for supporting difference of symbols. */
217 HOWTO (R_XTENSA_DIFF8
, 0, 0, 8, FALSE
, 0, complain_overflow_bitfield
,
218 bfd_elf_xtensa_reloc
, "R_XTENSA_DIFF8", FALSE
, 0, 0xff, FALSE
),
219 HOWTO (R_XTENSA_DIFF16
, 0, 1, 16, FALSE
, 0, complain_overflow_bitfield
,
220 bfd_elf_xtensa_reloc
, "R_XTENSA_DIFF16", FALSE
, 0, 0xffff, FALSE
),
221 HOWTO (R_XTENSA_DIFF32
, 0, 2, 32, FALSE
, 0, complain_overflow_bitfield
,
222 bfd_elf_xtensa_reloc
, "R_XTENSA_DIFF32", FALSE
, 0, 0xffffffff, FALSE
),
224 /* General immediate operand relocations. */
225 HOWTO (R_XTENSA_SLOT0_OP
, 0, 0, 0, TRUE
, 0, complain_overflow_dont
,
226 bfd_elf_xtensa_reloc
, "R_XTENSA_SLOT0_OP", FALSE
, 0, 0, TRUE
),
227 HOWTO (R_XTENSA_SLOT1_OP
, 0, 0, 0, TRUE
, 0, complain_overflow_dont
,
228 bfd_elf_xtensa_reloc
, "R_XTENSA_SLOT1_OP", FALSE
, 0, 0, TRUE
),
229 HOWTO (R_XTENSA_SLOT2_OP
, 0, 0, 0, TRUE
, 0, complain_overflow_dont
,
230 bfd_elf_xtensa_reloc
, "R_XTENSA_SLOT2_OP", FALSE
, 0, 0, TRUE
),
231 HOWTO (R_XTENSA_SLOT3_OP
, 0, 0, 0, TRUE
, 0, complain_overflow_dont
,
232 bfd_elf_xtensa_reloc
, "R_XTENSA_SLOT3_OP", FALSE
, 0, 0, TRUE
),
233 HOWTO (R_XTENSA_SLOT4_OP
, 0, 0, 0, TRUE
, 0, complain_overflow_dont
,
234 bfd_elf_xtensa_reloc
, "R_XTENSA_SLOT4_OP", FALSE
, 0, 0, TRUE
),
235 HOWTO (R_XTENSA_SLOT5_OP
, 0, 0, 0, TRUE
, 0, complain_overflow_dont
,
236 bfd_elf_xtensa_reloc
, "R_XTENSA_SLOT5_OP", FALSE
, 0, 0, TRUE
),
237 HOWTO (R_XTENSA_SLOT6_OP
, 0, 0, 0, TRUE
, 0, complain_overflow_dont
,
238 bfd_elf_xtensa_reloc
, "R_XTENSA_SLOT6_OP", FALSE
, 0, 0, TRUE
),
239 HOWTO (R_XTENSA_SLOT7_OP
, 0, 0, 0, TRUE
, 0, complain_overflow_dont
,
240 bfd_elf_xtensa_reloc
, "R_XTENSA_SLOT7_OP", FALSE
, 0, 0, TRUE
),
241 HOWTO (R_XTENSA_SLOT8_OP
, 0, 0, 0, TRUE
, 0, complain_overflow_dont
,
242 bfd_elf_xtensa_reloc
, "R_XTENSA_SLOT8_OP", FALSE
, 0, 0, TRUE
),
243 HOWTO (R_XTENSA_SLOT9_OP
, 0, 0, 0, TRUE
, 0, complain_overflow_dont
,
244 bfd_elf_xtensa_reloc
, "R_XTENSA_SLOT9_OP", FALSE
, 0, 0, TRUE
),
245 HOWTO (R_XTENSA_SLOT10_OP
, 0, 0, 0, TRUE
, 0, complain_overflow_dont
,
246 bfd_elf_xtensa_reloc
, "R_XTENSA_SLOT10_OP", FALSE
, 0, 0, TRUE
),
247 HOWTO (R_XTENSA_SLOT11_OP
, 0, 0, 0, TRUE
, 0, complain_overflow_dont
,
248 bfd_elf_xtensa_reloc
, "R_XTENSA_SLOT11_OP", FALSE
, 0, 0, TRUE
),
249 HOWTO (R_XTENSA_SLOT12_OP
, 0, 0, 0, TRUE
, 0, complain_overflow_dont
,
250 bfd_elf_xtensa_reloc
, "R_XTENSA_SLOT12_OP", FALSE
, 0, 0, TRUE
),
251 HOWTO (R_XTENSA_SLOT13_OP
, 0, 0, 0, TRUE
, 0, complain_overflow_dont
,
252 bfd_elf_xtensa_reloc
, "R_XTENSA_SLOT13_OP", FALSE
, 0, 0, TRUE
),
253 HOWTO (R_XTENSA_SLOT14_OP
, 0, 0, 0, TRUE
, 0, complain_overflow_dont
,
254 bfd_elf_xtensa_reloc
, "R_XTENSA_SLOT14_OP", FALSE
, 0, 0, TRUE
),
256 /* "Alternate" relocations. The meaning of these is opcode-specific. */
257 HOWTO (R_XTENSA_SLOT0_ALT
, 0, 0, 0, TRUE
, 0, complain_overflow_dont
,
258 bfd_elf_xtensa_reloc
, "R_XTENSA_SLOT0_ALT", FALSE
, 0, 0, TRUE
),
259 HOWTO (R_XTENSA_SLOT1_ALT
, 0, 0, 0, TRUE
, 0, complain_overflow_dont
,
260 bfd_elf_xtensa_reloc
, "R_XTENSA_SLOT1_ALT", FALSE
, 0, 0, TRUE
),
261 HOWTO (R_XTENSA_SLOT2_ALT
, 0, 0, 0, TRUE
, 0, complain_overflow_dont
,
262 bfd_elf_xtensa_reloc
, "R_XTENSA_SLOT2_ALT", FALSE
, 0, 0, TRUE
),
263 HOWTO (R_XTENSA_SLOT3_ALT
, 0, 0, 0, TRUE
, 0, complain_overflow_dont
,
264 bfd_elf_xtensa_reloc
, "R_XTENSA_SLOT3_ALT", FALSE
, 0, 0, TRUE
),
265 HOWTO (R_XTENSA_SLOT4_ALT
, 0, 0, 0, TRUE
, 0, complain_overflow_dont
,
266 bfd_elf_xtensa_reloc
, "R_XTENSA_SLOT4_ALT", FALSE
, 0, 0, TRUE
),
267 HOWTO (R_XTENSA_SLOT5_ALT
, 0, 0, 0, TRUE
, 0, complain_overflow_dont
,
268 bfd_elf_xtensa_reloc
, "R_XTENSA_SLOT5_ALT", FALSE
, 0, 0, TRUE
),
269 HOWTO (R_XTENSA_SLOT6_ALT
, 0, 0, 0, TRUE
, 0, complain_overflow_dont
,
270 bfd_elf_xtensa_reloc
, "R_XTENSA_SLOT6_ALT", FALSE
, 0, 0, TRUE
),
271 HOWTO (R_XTENSA_SLOT7_ALT
, 0, 0, 0, TRUE
, 0, complain_overflow_dont
,
272 bfd_elf_xtensa_reloc
, "R_XTENSA_SLOT7_ALT", FALSE
, 0, 0, TRUE
),
273 HOWTO (R_XTENSA_SLOT8_ALT
, 0, 0, 0, TRUE
, 0, complain_overflow_dont
,
274 bfd_elf_xtensa_reloc
, "R_XTENSA_SLOT8_ALT", FALSE
, 0, 0, TRUE
),
275 HOWTO (R_XTENSA_SLOT9_ALT
, 0, 0, 0, TRUE
, 0, complain_overflow_dont
,
276 bfd_elf_xtensa_reloc
, "R_XTENSA_SLOT9_ALT", FALSE
, 0, 0, TRUE
),
277 HOWTO (R_XTENSA_SLOT10_ALT
, 0, 0, 0, TRUE
, 0, complain_overflow_dont
,
278 bfd_elf_xtensa_reloc
, "R_XTENSA_SLOT10_ALT", FALSE
, 0, 0, TRUE
),
279 HOWTO (R_XTENSA_SLOT11_ALT
, 0, 0, 0, TRUE
, 0, complain_overflow_dont
,
280 bfd_elf_xtensa_reloc
, "R_XTENSA_SLOT11_ALT", FALSE
, 0, 0, TRUE
),
281 HOWTO (R_XTENSA_SLOT12_ALT
, 0, 0, 0, TRUE
, 0, complain_overflow_dont
,
282 bfd_elf_xtensa_reloc
, "R_XTENSA_SLOT12_ALT", FALSE
, 0, 0, TRUE
),
283 HOWTO (R_XTENSA_SLOT13_ALT
, 0, 0, 0, TRUE
, 0, complain_overflow_dont
,
284 bfd_elf_xtensa_reloc
, "R_XTENSA_SLOT13_ALT", FALSE
, 0, 0, TRUE
),
285 HOWTO (R_XTENSA_SLOT14_ALT
, 0, 0, 0, TRUE
, 0, complain_overflow_dont
,
286 bfd_elf_xtensa_reloc
, "R_XTENSA_SLOT14_ALT", FALSE
, 0, 0, TRUE
),
291 fprintf (stderr, "Xtensa bfd reloc lookup %d (%s)\n", code, str)
296 static reloc_howto_type
*
297 elf_xtensa_reloc_type_lookup (bfd
*abfd ATTRIBUTE_UNUSED
,
298 bfd_reloc_code_real_type code
)
303 TRACE ("BFD_RELOC_NONE");
304 return &elf_howto_table
[(unsigned) R_XTENSA_NONE
];
307 TRACE ("BFD_RELOC_32");
308 return &elf_howto_table
[(unsigned) R_XTENSA_32
];
310 case BFD_RELOC_XTENSA_DIFF8
:
311 TRACE ("BFD_RELOC_XTENSA_DIFF8");
312 return &elf_howto_table
[(unsigned) R_XTENSA_DIFF8
];
314 case BFD_RELOC_XTENSA_DIFF16
:
315 TRACE ("BFD_RELOC_XTENSA_DIFF16");
316 return &elf_howto_table
[(unsigned) R_XTENSA_DIFF16
];
318 case BFD_RELOC_XTENSA_DIFF32
:
319 TRACE ("BFD_RELOC_XTENSA_DIFF32");
320 return &elf_howto_table
[(unsigned) R_XTENSA_DIFF32
];
322 case BFD_RELOC_XTENSA_RTLD
:
323 TRACE ("BFD_RELOC_XTENSA_RTLD");
324 return &elf_howto_table
[(unsigned) R_XTENSA_RTLD
];
326 case BFD_RELOC_XTENSA_GLOB_DAT
:
327 TRACE ("BFD_RELOC_XTENSA_GLOB_DAT");
328 return &elf_howto_table
[(unsigned) R_XTENSA_GLOB_DAT
];
330 case BFD_RELOC_XTENSA_JMP_SLOT
:
331 TRACE ("BFD_RELOC_XTENSA_JMP_SLOT");
332 return &elf_howto_table
[(unsigned) R_XTENSA_JMP_SLOT
];
334 case BFD_RELOC_XTENSA_RELATIVE
:
335 TRACE ("BFD_RELOC_XTENSA_RELATIVE");
336 return &elf_howto_table
[(unsigned) R_XTENSA_RELATIVE
];
338 case BFD_RELOC_XTENSA_PLT
:
339 TRACE ("BFD_RELOC_XTENSA_PLT");
340 return &elf_howto_table
[(unsigned) R_XTENSA_PLT
];
342 case BFD_RELOC_XTENSA_OP0
:
343 TRACE ("BFD_RELOC_XTENSA_OP0");
344 return &elf_howto_table
[(unsigned) R_XTENSA_OP0
];
346 case BFD_RELOC_XTENSA_OP1
:
347 TRACE ("BFD_RELOC_XTENSA_OP1");
348 return &elf_howto_table
[(unsigned) R_XTENSA_OP1
];
350 case BFD_RELOC_XTENSA_OP2
:
351 TRACE ("BFD_RELOC_XTENSA_OP2");
352 return &elf_howto_table
[(unsigned) R_XTENSA_OP2
];
354 case BFD_RELOC_XTENSA_ASM_EXPAND
:
355 TRACE ("BFD_RELOC_XTENSA_ASM_EXPAND");
356 return &elf_howto_table
[(unsigned) R_XTENSA_ASM_EXPAND
];
358 case BFD_RELOC_XTENSA_ASM_SIMPLIFY
:
359 TRACE ("BFD_RELOC_XTENSA_ASM_SIMPLIFY");
360 return &elf_howto_table
[(unsigned) R_XTENSA_ASM_SIMPLIFY
];
362 case BFD_RELOC_VTABLE_INHERIT
:
363 TRACE ("BFD_RELOC_VTABLE_INHERIT");
364 return &elf_howto_table
[(unsigned) R_XTENSA_GNU_VTINHERIT
];
366 case BFD_RELOC_VTABLE_ENTRY
:
367 TRACE ("BFD_RELOC_VTABLE_ENTRY");
368 return &elf_howto_table
[(unsigned) R_XTENSA_GNU_VTENTRY
];
371 if (code
>= BFD_RELOC_XTENSA_SLOT0_OP
372 && code
<= BFD_RELOC_XTENSA_SLOT14_OP
)
374 unsigned n
= (R_XTENSA_SLOT0_OP
+
375 (code
- BFD_RELOC_XTENSA_SLOT0_OP
));
376 return &elf_howto_table
[n
];
379 if (code
>= BFD_RELOC_XTENSA_SLOT0_ALT
380 && code
<= BFD_RELOC_XTENSA_SLOT14_ALT
)
382 unsigned n
= (R_XTENSA_SLOT0_ALT
+
383 (code
- BFD_RELOC_XTENSA_SLOT0_ALT
));
384 return &elf_howto_table
[n
];
394 static reloc_howto_type
*
395 elf_xtensa_reloc_name_lookup (bfd
*abfd ATTRIBUTE_UNUSED
,
400 for (i
= 0; i
< sizeof (elf_howto_table
) / sizeof (elf_howto_table
[0]); i
++)
401 if (elf_howto_table
[i
].name
!= NULL
402 && strcasecmp (elf_howto_table
[i
].name
, r_name
) == 0)
403 return &elf_howto_table
[i
];
409 /* Given an ELF "rela" relocation, find the corresponding howto and record
410 it in the BFD internal arelent representation of the relocation. */
413 elf_xtensa_info_to_howto_rela (bfd
*abfd ATTRIBUTE_UNUSED
,
415 Elf_Internal_Rela
*dst
)
417 unsigned int r_type
= ELF32_R_TYPE (dst
->r_info
);
419 BFD_ASSERT (r_type
< (unsigned int) R_XTENSA_max
);
420 cache_ptr
->howto
= &elf_howto_table
[r_type
];
424 /* Functions for the Xtensa ELF linker. */
426 /* The name of the dynamic interpreter. This is put in the .interp
429 #define ELF_DYNAMIC_INTERPRETER "/lib/ld.so"
431 /* The size in bytes of an entry in the procedure linkage table.
432 (This does _not_ include the space for the literals associated with
435 #define PLT_ENTRY_SIZE 16
437 /* For _really_ large PLTs, we may need to alternate between literals
438 and code to keep the literals within the 256K range of the L32R
439 instructions in the code. It's unlikely that anyone would ever need
440 such a big PLT, but an arbitrary limit on the PLT size would be bad.
441 Thus, we split the PLT into chunks. Since there's very little
442 overhead (2 extra literals) for each chunk, the chunk size is kept
443 small so that the code for handling multiple chunks get used and
444 tested regularly. With 254 entries, there are 1K of literals for
445 each chunk, and that seems like a nice round number. */
447 #define PLT_ENTRIES_PER_CHUNK 254
449 /* PLT entries are actually used as stub functions for lazy symbol
450 resolution. Once the symbol is resolved, the stub function is never
451 invoked. Note: the 32-byte frame size used here cannot be changed
452 without a corresponding change in the runtime linker. */
454 static const bfd_byte elf_xtensa_be_plt_entry
[PLT_ENTRY_SIZE
] =
456 0x6c, 0x10, 0x04, /* entry sp, 32 */
457 0x18, 0x00, 0x00, /* l32r a8, [got entry for rtld's resolver] */
458 0x1a, 0x00, 0x00, /* l32r a10, [got entry for rtld's link map] */
459 0x1b, 0x00, 0x00, /* l32r a11, [literal for reloc index] */
460 0x0a, 0x80, 0x00, /* jx a8 */
464 static const bfd_byte elf_xtensa_le_plt_entry
[PLT_ENTRY_SIZE
] =
466 0x36, 0x41, 0x00, /* entry sp, 32 */
467 0x81, 0x00, 0x00, /* l32r a8, [got entry for rtld's resolver] */
468 0xa1, 0x00, 0x00, /* l32r a10, [got entry for rtld's link map] */
469 0xb1, 0x00, 0x00, /* l32r a11, [literal for reloc index] */
470 0xa0, 0x08, 0x00, /* jx a8 */
474 /* Xtensa ELF linker hash table. */
476 struct elf_xtensa_link_hash_table
478 struct elf_link_hash_table elf
;
480 /* Short-cuts to get to dynamic linker sections. */
487 asection
*spltlittbl
;
489 /* Total count of PLT relocations seen during check_relocs.
490 The actual PLT code must be split into multiple sections and all
491 the sections have to be created before size_dynamic_sections,
492 where we figure out the exact number of PLT entries that will be
493 needed. It is OK if this count is an overestimate, e.g., some
494 relocations may be removed by GC. */
498 /* Get the Xtensa ELF linker hash table from a link_info structure. */
500 #define elf_xtensa_hash_table(p) \
501 ((struct elf_xtensa_link_hash_table *) ((p)->hash))
503 /* Create an Xtensa ELF linker hash table. */
505 static struct bfd_link_hash_table
*
506 elf_xtensa_link_hash_table_create (bfd
*abfd
)
508 struct elf_xtensa_link_hash_table
*ret
;
509 bfd_size_type amt
= sizeof (struct elf_xtensa_link_hash_table
);
511 ret
= bfd_malloc (amt
);
515 if (!_bfd_elf_link_hash_table_init (&ret
->elf
, abfd
,
516 _bfd_elf_link_hash_newfunc
,
517 sizeof (struct elf_link_hash_entry
)))
529 ret
->spltlittbl
= NULL
;
531 ret
->plt_reloc_count
= 0;
533 return &ret
->elf
.root
;
536 static inline bfd_boolean
537 elf_xtensa_dynamic_symbol_p (struct elf_link_hash_entry
*h
,
538 struct bfd_link_info
*info
)
540 /* Check if we should do dynamic things to this symbol. The
541 "ignore_protected" argument need not be set, because Xtensa code
542 does not require special handling of STV_PROTECTED to make function
543 pointer comparisons work properly. The PLT addresses are never
544 used for function pointers. */
546 return _bfd_elf_dynamic_symbol_p (h
, info
, 0);
551 property_table_compare (const void *ap
, const void *bp
)
553 const property_table_entry
*a
= (const property_table_entry
*) ap
;
554 const property_table_entry
*b
= (const property_table_entry
*) bp
;
556 if (a
->address
== b
->address
)
558 if (a
->size
!= b
->size
)
559 return (a
->size
- b
->size
);
561 if ((a
->flags
& XTENSA_PROP_ALIGN
) != (b
->flags
& XTENSA_PROP_ALIGN
))
562 return ((b
->flags
& XTENSA_PROP_ALIGN
)
563 - (a
->flags
& XTENSA_PROP_ALIGN
));
565 if ((a
->flags
& XTENSA_PROP_ALIGN
)
566 && (GET_XTENSA_PROP_ALIGNMENT (a
->flags
)
567 != GET_XTENSA_PROP_ALIGNMENT (b
->flags
)))
568 return (GET_XTENSA_PROP_ALIGNMENT (a
->flags
)
569 - GET_XTENSA_PROP_ALIGNMENT (b
->flags
));
571 if ((a
->flags
& XTENSA_PROP_UNREACHABLE
)
572 != (b
->flags
& XTENSA_PROP_UNREACHABLE
))
573 return ((b
->flags
& XTENSA_PROP_UNREACHABLE
)
574 - (a
->flags
& XTENSA_PROP_UNREACHABLE
));
576 return (a
->flags
- b
->flags
);
579 return (a
->address
- b
->address
);
584 property_table_matches (const void *ap
, const void *bp
)
586 const property_table_entry
*a
= (const property_table_entry
*) ap
;
587 const property_table_entry
*b
= (const property_table_entry
*) bp
;
589 /* Check if one entry overlaps with the other. */
590 if ((b
->address
>= a
->address
&& b
->address
< (a
->address
+ a
->size
))
591 || (a
->address
>= b
->address
&& a
->address
< (b
->address
+ b
->size
)))
594 return (a
->address
- b
->address
);
598 /* Get the literal table or property table entries for the given
599 section. Sets TABLE_P and returns the number of entries. On
600 error, returns a negative value. */
603 xtensa_read_table_entries (bfd
*abfd
,
605 property_table_entry
**table_p
,
606 const char *sec_name
,
607 bfd_boolean output_addr
)
609 asection
*table_section
;
610 bfd_size_type table_size
= 0;
611 bfd_byte
*table_data
;
612 property_table_entry
*blocks
;
613 int blk
, block_count
;
614 bfd_size_type num_records
;
615 Elf_Internal_Rela
*internal_relocs
, *irel
, *rel_end
;
616 bfd_vma section_addr
, off
;
617 flagword predef_flags
;
618 bfd_size_type table_entry_size
, section_limit
;
621 || !(section
->flags
& SEC_ALLOC
)
622 || (section
->flags
& SEC_DEBUGGING
))
628 table_section
= xtensa_get_property_section (section
, sec_name
);
630 table_size
= table_section
->size
;
638 predef_flags
= xtensa_get_property_predef_flags (table_section
);
639 table_entry_size
= 12;
641 table_entry_size
-= 4;
643 num_records
= table_size
/ table_entry_size
;
644 table_data
= retrieve_contents (abfd
, table_section
, TRUE
);
645 blocks
= (property_table_entry
*)
646 bfd_malloc (num_records
* sizeof (property_table_entry
));
650 section_addr
= section
->output_section
->vma
+ section
->output_offset
;
652 section_addr
= section
->vma
;
654 internal_relocs
= retrieve_internal_relocs (abfd
, table_section
, TRUE
);
655 if (internal_relocs
&& !table_section
->reloc_done
)
657 qsort (internal_relocs
, table_section
->reloc_count
,
658 sizeof (Elf_Internal_Rela
), internal_reloc_compare
);
659 irel
= internal_relocs
;
664 section_limit
= bfd_get_section_limit (abfd
, section
);
665 rel_end
= internal_relocs
+ table_section
->reloc_count
;
667 for (off
= 0; off
< table_size
; off
+= table_entry_size
)
669 bfd_vma address
= bfd_get_32 (abfd
, table_data
+ off
);
671 /* Skip any relocations before the current offset. This should help
672 avoid confusion caused by unexpected relocations for the preceding
675 (irel
->r_offset
< off
676 || (irel
->r_offset
== off
677 && ELF32_R_TYPE (irel
->r_info
) == R_XTENSA_NONE
)))
684 if (irel
&& irel
->r_offset
== off
)
687 unsigned long r_symndx
= ELF32_R_SYM (irel
->r_info
);
688 BFD_ASSERT (ELF32_R_TYPE (irel
->r_info
) == R_XTENSA_32
);
690 if (get_elf_r_symndx_section (abfd
, r_symndx
) != section
)
693 sym_off
= get_elf_r_symndx_offset (abfd
, r_symndx
);
694 BFD_ASSERT (sym_off
== 0);
695 address
+= (section_addr
+ sym_off
+ irel
->r_addend
);
699 if (address
< section_addr
700 || address
>= section_addr
+ section_limit
)
704 blocks
[block_count
].address
= address
;
705 blocks
[block_count
].size
= bfd_get_32 (abfd
, table_data
+ off
+ 4);
707 blocks
[block_count
].flags
= predef_flags
;
709 blocks
[block_count
].flags
= bfd_get_32 (abfd
, table_data
+ off
+ 8);
713 release_contents (table_section
, table_data
);
714 release_internal_relocs (table_section
, internal_relocs
);
718 /* Now sort them into address order for easy reference. */
719 qsort (blocks
, block_count
, sizeof (property_table_entry
),
720 property_table_compare
);
722 /* Check that the table contents are valid. Problems may occur,
723 for example, if an unrelocated object file is stripped. */
724 for (blk
= 1; blk
< block_count
; blk
++)
726 /* The only circumstance where two entries may legitimately
727 have the same address is when one of them is a zero-size
728 placeholder to mark a place where fill can be inserted.
729 The zero-size entry should come first. */
730 if (blocks
[blk
- 1].address
== blocks
[blk
].address
&&
731 blocks
[blk
- 1].size
!= 0)
733 (*_bfd_error_handler
) (_("%B(%A): invalid property table"),
735 bfd_set_error (bfd_error_bad_value
);
747 static property_table_entry
*
748 elf_xtensa_find_property_entry (property_table_entry
*property_table
,
749 int property_table_size
,
752 property_table_entry entry
;
753 property_table_entry
*rv
;
755 if (property_table_size
== 0)
758 entry
.address
= addr
;
762 rv
= bsearch (&entry
, property_table
, property_table_size
,
763 sizeof (property_table_entry
), property_table_matches
);
769 elf_xtensa_in_literal_pool (property_table_entry
*lit_table
,
773 if (elf_xtensa_find_property_entry (lit_table
, lit_table_size
, addr
))
780 /* Look through the relocs for a section during the first phase, and
781 calculate needed space in the dynamic reloc sections. */
784 elf_xtensa_check_relocs (bfd
*abfd
,
785 struct bfd_link_info
*info
,
787 const Elf_Internal_Rela
*relocs
)
789 struct elf_xtensa_link_hash_table
*htab
;
790 Elf_Internal_Shdr
*symtab_hdr
;
791 struct elf_link_hash_entry
**sym_hashes
;
792 const Elf_Internal_Rela
*rel
;
793 const Elf_Internal_Rela
*rel_end
;
795 if (info
->relocatable
)
798 htab
= elf_xtensa_hash_table (info
);
799 symtab_hdr
= &elf_tdata (abfd
)->symtab_hdr
;
800 sym_hashes
= elf_sym_hashes (abfd
);
802 rel_end
= relocs
+ sec
->reloc_count
;
803 for (rel
= relocs
; rel
< rel_end
; rel
++)
806 unsigned long r_symndx
;
807 struct elf_link_hash_entry
*h
;
809 r_symndx
= ELF32_R_SYM (rel
->r_info
);
810 r_type
= ELF32_R_TYPE (rel
->r_info
);
812 if (r_symndx
>= NUM_SHDR_ENTRIES (symtab_hdr
))
814 (*_bfd_error_handler
) (_("%B: bad symbol index: %d"),
819 if (r_symndx
< symtab_hdr
->sh_info
)
823 h
= sym_hashes
[r_symndx
- symtab_hdr
->sh_info
];
824 while (h
->root
.type
== bfd_link_hash_indirect
825 || h
->root
.type
== bfd_link_hash_warning
)
826 h
= (struct elf_link_hash_entry
*) h
->root
.u
.i
.link
;
835 if ((sec
->flags
& SEC_ALLOC
) != 0)
837 if (h
->got
.refcount
<= 0)
840 h
->got
.refcount
+= 1;
845 /* If this relocation is against a local symbol, then it's
846 exactly the same as a normal local GOT entry. */
850 if ((sec
->flags
& SEC_ALLOC
) != 0)
852 if (h
->plt
.refcount
<= 0)
858 h
->plt
.refcount
+= 1;
860 /* Keep track of the total PLT relocation count even if we
861 don't yet know whether the dynamic sections will be
863 htab
->plt_reloc_count
+= 1;
865 if (elf_hash_table (info
)->dynamic_sections_created
)
867 if (! add_extra_plt_sections (info
, htab
->plt_reloc_count
))
874 if ((sec
->flags
& SEC_ALLOC
) != 0)
876 bfd_signed_vma
*local_got_refcounts
;
878 /* This is a global offset table entry for a local symbol. */
879 local_got_refcounts
= elf_local_got_refcounts (abfd
);
880 if (local_got_refcounts
== NULL
)
884 size
= symtab_hdr
->sh_info
;
885 size
*= sizeof (bfd_signed_vma
);
886 local_got_refcounts
=
887 (bfd_signed_vma
*) bfd_zalloc (abfd
, size
);
888 if (local_got_refcounts
== NULL
)
890 elf_local_got_refcounts (abfd
) = local_got_refcounts
;
892 local_got_refcounts
[r_symndx
] += 1;
899 case R_XTENSA_SLOT0_OP
:
900 case R_XTENSA_SLOT1_OP
:
901 case R_XTENSA_SLOT2_OP
:
902 case R_XTENSA_SLOT3_OP
:
903 case R_XTENSA_SLOT4_OP
:
904 case R_XTENSA_SLOT5_OP
:
905 case R_XTENSA_SLOT6_OP
:
906 case R_XTENSA_SLOT7_OP
:
907 case R_XTENSA_SLOT8_OP
:
908 case R_XTENSA_SLOT9_OP
:
909 case R_XTENSA_SLOT10_OP
:
910 case R_XTENSA_SLOT11_OP
:
911 case R_XTENSA_SLOT12_OP
:
912 case R_XTENSA_SLOT13_OP
:
913 case R_XTENSA_SLOT14_OP
:
914 case R_XTENSA_SLOT0_ALT
:
915 case R_XTENSA_SLOT1_ALT
:
916 case R_XTENSA_SLOT2_ALT
:
917 case R_XTENSA_SLOT3_ALT
:
918 case R_XTENSA_SLOT4_ALT
:
919 case R_XTENSA_SLOT5_ALT
:
920 case R_XTENSA_SLOT6_ALT
:
921 case R_XTENSA_SLOT7_ALT
:
922 case R_XTENSA_SLOT8_ALT
:
923 case R_XTENSA_SLOT9_ALT
:
924 case R_XTENSA_SLOT10_ALT
:
925 case R_XTENSA_SLOT11_ALT
:
926 case R_XTENSA_SLOT12_ALT
:
927 case R_XTENSA_SLOT13_ALT
:
928 case R_XTENSA_SLOT14_ALT
:
929 case R_XTENSA_ASM_EXPAND
:
930 case R_XTENSA_ASM_SIMPLIFY
:
932 case R_XTENSA_DIFF16
:
933 case R_XTENSA_DIFF32
:
934 /* Nothing to do for these. */
937 case R_XTENSA_GNU_VTINHERIT
:
938 /* This relocation describes the C++ object vtable hierarchy.
939 Reconstruct it for later use during GC. */
940 if (!bfd_elf_gc_record_vtinherit (abfd
, sec
, h
, rel
->r_offset
))
944 case R_XTENSA_GNU_VTENTRY
:
945 /* This relocation describes which C++ vtable entries are actually
946 used. Record for later use during GC. */
947 if (!bfd_elf_gc_record_vtentry (abfd
, sec
, h
, rel
->r_addend
))
960 /* Return the section that should be marked against GC for a given
964 elf_xtensa_gc_mark_hook (asection
*sec
,
965 struct bfd_link_info
*info
,
966 Elf_Internal_Rela
*rel
,
967 struct elf_link_hash_entry
*h
,
968 Elf_Internal_Sym
*sym
)
970 /* Property sections are marked "KEEP" in the linker scripts, but they
971 should not cause other sections to be marked. (This approach relies
972 on elf_xtensa_discard_info to remove property table entries that
973 describe discarded sections. Alternatively, it might be more
974 efficient to avoid using "KEEP" in the linker scripts and instead use
975 the gc_mark_extra_sections hook to mark only the property sections
976 that describe marked sections. That alternative does not work well
977 with the current property table sections, which do not correspond
978 one-to-one with the sections they describe, but that should be fixed
980 if (xtensa_is_property_section (sec
))
984 switch (ELF32_R_TYPE (rel
->r_info
))
986 case R_XTENSA_GNU_VTINHERIT
:
987 case R_XTENSA_GNU_VTENTRY
:
991 return _bfd_elf_gc_mark_hook (sec
, info
, rel
, h
, sym
);
995 /* Update the GOT & PLT entry reference counts
996 for the section being removed. */
999 elf_xtensa_gc_sweep_hook (bfd
*abfd
,
1000 struct bfd_link_info
*info ATTRIBUTE_UNUSED
,
1002 const Elf_Internal_Rela
*relocs
)
1004 Elf_Internal_Shdr
*symtab_hdr
;
1005 struct elf_link_hash_entry
**sym_hashes
;
1006 bfd_signed_vma
*local_got_refcounts
;
1007 const Elf_Internal_Rela
*rel
, *relend
;
1009 if ((sec
->flags
& SEC_ALLOC
) == 0)
1012 symtab_hdr
= &elf_tdata (abfd
)->symtab_hdr
;
1013 sym_hashes
= elf_sym_hashes (abfd
);
1014 local_got_refcounts
= elf_local_got_refcounts (abfd
);
1016 relend
= relocs
+ sec
->reloc_count
;
1017 for (rel
= relocs
; rel
< relend
; rel
++)
1019 unsigned long r_symndx
;
1020 unsigned int r_type
;
1021 struct elf_link_hash_entry
*h
= NULL
;
1023 r_symndx
= ELF32_R_SYM (rel
->r_info
);
1024 if (r_symndx
>= symtab_hdr
->sh_info
)
1026 h
= sym_hashes
[r_symndx
- symtab_hdr
->sh_info
];
1027 while (h
->root
.type
== bfd_link_hash_indirect
1028 || h
->root
.type
== bfd_link_hash_warning
)
1029 h
= (struct elf_link_hash_entry
*) h
->root
.u
.i
.link
;
1032 r_type
= ELF32_R_TYPE (rel
->r_info
);
1038 if (h
->got
.refcount
> 0)
1045 if (h
->plt
.refcount
> 0)
1050 if (local_got_refcounts
[r_symndx
] > 0)
1051 local_got_refcounts
[r_symndx
] -= 1;
1063 /* Create all the dynamic sections. */
1066 elf_xtensa_create_dynamic_sections (bfd
*dynobj
, struct bfd_link_info
*info
)
1068 struct elf_xtensa_link_hash_table
*htab
;
1069 flagword flags
, noalloc_flags
;
1071 htab
= elf_xtensa_hash_table (info
);
1073 /* First do all the standard stuff. */
1074 if (! _bfd_elf_create_dynamic_sections (dynobj
, info
))
1076 htab
->splt
= bfd_get_section_by_name (dynobj
, ".plt");
1077 htab
->srelplt
= bfd_get_section_by_name (dynobj
, ".rela.plt");
1078 htab
->sgot
= bfd_get_section_by_name (dynobj
, ".got");
1079 htab
->sgotplt
= bfd_get_section_by_name (dynobj
, ".got.plt");
1081 /* Create any extra PLT sections in case check_relocs has already
1082 been called on all the non-dynamic input files. */
1083 if (! add_extra_plt_sections (info
, htab
->plt_reloc_count
))
1086 noalloc_flags
= (SEC_HAS_CONTENTS
| SEC_IN_MEMORY
1087 | SEC_LINKER_CREATED
| SEC_READONLY
);
1088 flags
= noalloc_flags
| SEC_ALLOC
| SEC_LOAD
;
1090 /* Mark the ".got.plt" section READONLY. */
1091 if (htab
->sgotplt
== NULL
1092 || ! bfd_set_section_flags (dynobj
, htab
->sgotplt
, flags
))
1095 /* Create ".rela.got". */
1096 htab
->srelgot
= bfd_make_section_with_flags (dynobj
, ".rela.got", flags
);
1097 if (htab
->srelgot
== NULL
1098 || ! bfd_set_section_alignment (dynobj
, htab
->srelgot
, 2))
1101 /* Create ".got.loc" (literal tables for use by dynamic linker). */
1102 htab
->sgotloc
= bfd_make_section_with_flags (dynobj
, ".got.loc", flags
);
1103 if (htab
->sgotloc
== NULL
1104 || ! bfd_set_section_alignment (dynobj
, htab
->sgotloc
, 2))
1107 /* Create ".xt.lit.plt" (literal table for ".got.plt*"). */
1108 htab
->spltlittbl
= bfd_make_section_with_flags (dynobj
, ".xt.lit.plt",
1110 if (htab
->spltlittbl
== NULL
1111 || ! bfd_set_section_alignment (dynobj
, htab
->spltlittbl
, 2))
1119 add_extra_plt_sections (struct bfd_link_info
*info
, int count
)
1121 bfd
*dynobj
= elf_hash_table (info
)->dynobj
;
1124 /* Iterate over all chunks except 0 which uses the standard ".plt" and
1125 ".got.plt" sections. */
1126 for (chunk
= count
/ PLT_ENTRIES_PER_CHUNK
; chunk
> 0; chunk
--)
1132 /* Stop when we find a section has already been created. */
1133 if (elf_xtensa_get_plt_section (info
, chunk
))
1136 flags
= (SEC_ALLOC
| SEC_LOAD
| SEC_HAS_CONTENTS
| SEC_IN_MEMORY
1137 | SEC_LINKER_CREATED
| SEC_READONLY
);
1139 sname
= (char *) bfd_malloc (10);
1140 sprintf (sname
, ".plt.%u", chunk
);
1141 s
= bfd_make_section_with_flags (dynobj
, sname
, flags
| SEC_CODE
);
1143 || ! bfd_set_section_alignment (dynobj
, s
, 2))
1146 sname
= (char *) bfd_malloc (14);
1147 sprintf (sname
, ".got.plt.%u", chunk
);
1148 s
= bfd_make_section_with_flags (dynobj
, sname
, flags
);
1150 || ! bfd_set_section_alignment (dynobj
, s
, 2))
1158 /* Adjust a symbol defined by a dynamic object and referenced by a
1159 regular object. The current definition is in some section of the
1160 dynamic object, but we're not including those sections. We have to
1161 change the definition to something the rest of the link can
1165 elf_xtensa_adjust_dynamic_symbol (struct bfd_link_info
*info ATTRIBUTE_UNUSED
,
1166 struct elf_link_hash_entry
*h
)
1168 /* If this is a weak symbol, and there is a real definition, the
1169 processor independent code will have arranged for us to see the
1170 real definition first, and we can just use the same value. */
1173 BFD_ASSERT (h
->u
.weakdef
->root
.type
== bfd_link_hash_defined
1174 || h
->u
.weakdef
->root
.type
== bfd_link_hash_defweak
);
1175 h
->root
.u
.def
.section
= h
->u
.weakdef
->root
.u
.def
.section
;
1176 h
->root
.u
.def
.value
= h
->u
.weakdef
->root
.u
.def
.value
;
1180 /* This is a reference to a symbol defined by a dynamic object. The
1181 reference must go through the GOT, so there's no need for COPY relocs,
1189 elf_xtensa_allocate_dynrelocs (struct elf_link_hash_entry
*h
, void *arg
)
1191 struct bfd_link_info
*info
;
1192 struct elf_xtensa_link_hash_table
*htab
;
1193 bfd_boolean is_dynamic
;
1195 if (h
->root
.type
== bfd_link_hash_indirect
)
1198 if (h
->root
.type
== bfd_link_hash_warning
)
1199 h
= (struct elf_link_hash_entry
*) h
->root
.u
.i
.link
;
1201 info
= (struct bfd_link_info
*) arg
;
1202 htab
= elf_xtensa_hash_table (info
);
1204 is_dynamic
= elf_xtensa_dynamic_symbol_p (h
, info
);
1210 /* For shared objects, there's no need for PLT entries for local
1211 symbols (use RELATIVE relocs instead of JMP_SLOT relocs). */
1212 if (h
->plt
.refcount
> 0)
1214 if (h
->got
.refcount
< 0)
1215 h
->got
.refcount
= 0;
1216 h
->got
.refcount
+= h
->plt
.refcount
;
1217 h
->plt
.refcount
= 0;
1222 /* Don't need any dynamic relocations at all. */
1223 h
->plt
.refcount
= 0;
1224 h
->got
.refcount
= 0;
1228 if (h
->plt
.refcount
> 0)
1229 htab
->srelplt
->size
+= (h
->plt
.refcount
* sizeof (Elf32_External_Rela
));
1231 if (h
->got
.refcount
> 0)
1232 htab
->srelgot
->size
+= (h
->got
.refcount
* sizeof (Elf32_External_Rela
));
1239 elf_xtensa_allocate_local_got_size (struct bfd_link_info
*info
)
1241 struct elf_xtensa_link_hash_table
*htab
;
1244 htab
= elf_xtensa_hash_table (info
);
1246 for (i
= info
->input_bfds
; i
; i
= i
->link_next
)
1248 bfd_signed_vma
*local_got_refcounts
;
1249 bfd_size_type j
, cnt
;
1250 Elf_Internal_Shdr
*symtab_hdr
;
1252 local_got_refcounts
= elf_local_got_refcounts (i
);
1253 if (!local_got_refcounts
)
1256 symtab_hdr
= &elf_tdata (i
)->symtab_hdr
;
1257 cnt
= symtab_hdr
->sh_info
;
1259 for (j
= 0; j
< cnt
; ++j
)
1261 if (local_got_refcounts
[j
] > 0)
1262 htab
->srelgot
->size
+= (local_got_refcounts
[j
]
1263 * sizeof (Elf32_External_Rela
));
1269 /* Set the sizes of the dynamic sections. */
1272 elf_xtensa_size_dynamic_sections (bfd
*output_bfd ATTRIBUTE_UNUSED
,
1273 struct bfd_link_info
*info
)
1275 struct elf_xtensa_link_hash_table
*htab
;
1277 asection
*s
, *srelplt
, *splt
, *sgotplt
, *srelgot
, *spltlittbl
, *sgotloc
;
1278 bfd_boolean relplt
, relgot
;
1279 int plt_entries
, plt_chunks
, chunk
;
1284 htab
= elf_xtensa_hash_table (info
);
1285 dynobj
= elf_hash_table (info
)->dynobj
;
1288 srelgot
= htab
->srelgot
;
1289 srelplt
= htab
->srelplt
;
1291 if (elf_hash_table (info
)->dynamic_sections_created
)
1293 BFD_ASSERT (htab
->srelgot
!= NULL
1294 && htab
->srelplt
!= NULL
1295 && htab
->sgot
!= NULL
1296 && htab
->spltlittbl
!= NULL
1297 && htab
->sgotloc
!= NULL
);
1299 /* Set the contents of the .interp section to the interpreter. */
1300 if (info
->executable
)
1302 s
= bfd_get_section_by_name (dynobj
, ".interp");
1305 s
->size
= sizeof ELF_DYNAMIC_INTERPRETER
;
1306 s
->contents
= (unsigned char *) ELF_DYNAMIC_INTERPRETER
;
1309 /* Allocate room for one word in ".got". */
1310 htab
->sgot
->size
= 4;
1312 /* Allocate space in ".rela.got" for literals that reference global
1313 symbols and space in ".rela.plt" for literals that have PLT
1315 elf_link_hash_traverse (elf_hash_table (info
),
1316 elf_xtensa_allocate_dynrelocs
,
1319 /* If we are generating a shared object, we also need space in
1320 ".rela.got" for R_XTENSA_RELATIVE relocs for literals that
1321 reference local symbols. */
1323 elf_xtensa_allocate_local_got_size (info
);
1325 /* Allocate space in ".plt" to match the size of ".rela.plt". For
1326 each PLT entry, we need the PLT code plus a 4-byte literal.
1327 For each chunk of ".plt", we also need two more 4-byte
1328 literals, two corresponding entries in ".rela.got", and an
1329 8-byte entry in ".xt.lit.plt". */
1330 spltlittbl
= htab
->spltlittbl
;
1331 plt_entries
= srelplt
->size
/ sizeof (Elf32_External_Rela
);
1333 (plt_entries
+ PLT_ENTRIES_PER_CHUNK
- 1) / PLT_ENTRIES_PER_CHUNK
;
1335 /* Iterate over all the PLT chunks, including any extra sections
1336 created earlier because the initial count of PLT relocations
1337 was an overestimate. */
1339 (splt
= elf_xtensa_get_plt_section (info
, chunk
)) != NULL
;
1344 sgotplt
= elf_xtensa_get_gotplt_section (info
, chunk
);
1345 BFD_ASSERT (sgotplt
!= NULL
);
1347 if (chunk
< plt_chunks
- 1)
1348 chunk_entries
= PLT_ENTRIES_PER_CHUNK
;
1349 else if (chunk
== plt_chunks
- 1)
1350 chunk_entries
= plt_entries
- (chunk
* PLT_ENTRIES_PER_CHUNK
);
1354 if (chunk_entries
!= 0)
1356 sgotplt
->size
= 4 * (chunk_entries
+ 2);
1357 splt
->size
= PLT_ENTRY_SIZE
* chunk_entries
;
1358 srelgot
->size
+= 2 * sizeof (Elf32_External_Rela
);
1359 spltlittbl
->size
+= 8;
1368 /* Allocate space in ".got.loc" to match the total size of all the
1370 sgotloc
= htab
->sgotloc
;
1371 sgotloc
->size
= spltlittbl
->size
;
1372 for (abfd
= info
->input_bfds
; abfd
!= NULL
; abfd
= abfd
->link_next
)
1374 if (abfd
->flags
& DYNAMIC
)
1376 for (s
= abfd
->sections
; s
!= NULL
; s
= s
->next
)
1378 if (! elf_discarded_section (s
)
1379 && xtensa_is_littable_section (s
)
1381 sgotloc
->size
+= s
->size
;
1386 /* Allocate memory for dynamic sections. */
1389 for (s
= dynobj
->sections
; s
!= NULL
; s
= s
->next
)
1393 if ((s
->flags
& SEC_LINKER_CREATED
) == 0)
1396 /* It's OK to base decisions on the section name, because none
1397 of the dynobj section names depend upon the input files. */
1398 name
= bfd_get_section_name (dynobj
, s
);
1400 if (CONST_STRNEQ (name
, ".rela"))
1404 if (strcmp (name
, ".rela.plt") == 0)
1406 else if (strcmp (name
, ".rela.got") == 0)
1409 /* We use the reloc_count field as a counter if we need
1410 to copy relocs into the output file. */
1414 else if (! CONST_STRNEQ (name
, ".plt.")
1415 && ! CONST_STRNEQ (name
, ".got.plt.")
1416 && strcmp (name
, ".got") != 0
1417 && strcmp (name
, ".plt") != 0
1418 && strcmp (name
, ".got.plt") != 0
1419 && strcmp (name
, ".xt.lit.plt") != 0
1420 && strcmp (name
, ".got.loc") != 0)
1422 /* It's not one of our sections, so don't allocate space. */
1428 /* If we don't need this section, strip it from the output
1429 file. We must create the ".plt*" and ".got.plt*"
1430 sections in create_dynamic_sections and/or check_relocs
1431 based on a conservative estimate of the PLT relocation
1432 count, because the sections must be created before the
1433 linker maps input sections to output sections. The
1434 linker does that before size_dynamic_sections, where we
1435 compute the exact size of the PLT, so there may be more
1436 of these sections than are actually needed. */
1437 s
->flags
|= SEC_EXCLUDE
;
1439 else if ((s
->flags
& SEC_HAS_CONTENTS
) != 0)
1441 /* Allocate memory for the section contents. */
1442 s
->contents
= (bfd_byte
*) bfd_zalloc (dynobj
, s
->size
);
1443 if (s
->contents
== NULL
)
1448 if (elf_hash_table (info
)->dynamic_sections_created
)
1450 /* Add the special XTENSA_RTLD relocations now. The offsets won't be
1451 known until finish_dynamic_sections, but we need to get the relocs
1452 in place before they are sorted. */
1453 for (chunk
= 0; chunk
< plt_chunks
; chunk
++)
1455 Elf_Internal_Rela irela
;
1459 irela
.r_info
= ELF32_R_INFO (0, R_XTENSA_RTLD
);
1462 loc
= (srelgot
->contents
1463 + srelgot
->reloc_count
* sizeof (Elf32_External_Rela
));
1464 bfd_elf32_swap_reloca_out (output_bfd
, &irela
, loc
);
1465 bfd_elf32_swap_reloca_out (output_bfd
, &irela
,
1466 loc
+ sizeof (Elf32_External_Rela
));
1467 srelgot
->reloc_count
+= 2;
1470 /* Add some entries to the .dynamic section. We fill in the
1471 values later, in elf_xtensa_finish_dynamic_sections, but we
1472 must add the entries now so that we get the correct size for
1473 the .dynamic section. The DT_DEBUG entry is filled in by the
1474 dynamic linker and used by the debugger. */
1475 #define add_dynamic_entry(TAG, VAL) \
1476 _bfd_elf_add_dynamic_entry (info, TAG, VAL)
1478 if (info
->executable
)
1480 if (!add_dynamic_entry (DT_DEBUG
, 0))
1486 if (!add_dynamic_entry (DT_PLTGOT
, 0)
1487 || !add_dynamic_entry (DT_PLTRELSZ
, 0)
1488 || !add_dynamic_entry (DT_PLTREL
, DT_RELA
)
1489 || !add_dynamic_entry (DT_JMPREL
, 0))
1495 if (!add_dynamic_entry (DT_RELA
, 0)
1496 || !add_dynamic_entry (DT_RELASZ
, 0)
1497 || !add_dynamic_entry (DT_RELAENT
, sizeof (Elf32_External_Rela
)))
1501 if (!add_dynamic_entry (DT_XTENSA_GOT_LOC_OFF
, 0)
1502 || !add_dynamic_entry (DT_XTENSA_GOT_LOC_SZ
, 0))
1505 #undef add_dynamic_entry
1511 /* Perform the specified relocation. The instruction at (contents + address)
1512 is modified to set one operand to represent the value in "relocation". The
1513 operand position is determined by the relocation type recorded in the
1516 #define CALL_SEGMENT_BITS (30)
1517 #define CALL_SEGMENT_SIZE (1 << CALL_SEGMENT_BITS)
1519 static bfd_reloc_status_type
1520 elf_xtensa_do_reloc (reloc_howto_type
*howto
,
1522 asection
*input_section
,
1526 bfd_boolean is_weak_undef
,
1527 char **error_message
)
1530 xtensa_opcode opcode
;
1531 xtensa_isa isa
= xtensa_default_isa
;
1532 static xtensa_insnbuf ibuff
= NULL
;
1533 static xtensa_insnbuf sbuff
= NULL
;
1534 bfd_vma self_address
= 0;
1535 bfd_size_type input_size
;
1541 ibuff
= xtensa_insnbuf_alloc (isa
);
1542 sbuff
= xtensa_insnbuf_alloc (isa
);
1545 input_size
= bfd_get_section_limit (abfd
, input_section
);
1547 switch (howto
->type
)
1550 case R_XTENSA_DIFF8
:
1551 case R_XTENSA_DIFF16
:
1552 case R_XTENSA_DIFF32
:
1553 return bfd_reloc_ok
;
1555 case R_XTENSA_ASM_EXPAND
:
1558 /* Check for windowed CALL across a 1GB boundary. */
1559 xtensa_opcode opcode
=
1560 get_expanded_call_opcode (contents
+ address
,
1561 input_size
- address
, 0);
1562 if (is_windowed_call_opcode (opcode
))
1564 self_address
= (input_section
->output_section
->vma
1565 + input_section
->output_offset
1567 if ((self_address
>> CALL_SEGMENT_BITS
)
1568 != (relocation
>> CALL_SEGMENT_BITS
))
1570 *error_message
= "windowed longcall crosses 1GB boundary; "
1572 return bfd_reloc_dangerous
;
1576 return bfd_reloc_ok
;
1578 case R_XTENSA_ASM_SIMPLIFY
:
1580 /* Convert the L32R/CALLX to CALL. */
1581 bfd_reloc_status_type retval
=
1582 elf_xtensa_do_asm_simplify (contents
, address
, input_size
,
1584 if (retval
!= bfd_reloc_ok
)
1585 return bfd_reloc_dangerous
;
1587 /* The CALL needs to be relocated. Continue below for that part. */
1589 howto
= &elf_howto_table
[(unsigned) R_XTENSA_SLOT0_OP
];
1597 x
= bfd_get_32 (abfd
, contents
+ address
);
1599 bfd_put_32 (abfd
, x
, contents
+ address
);
1601 return bfd_reloc_ok
;
1604 /* Only instruction slot-specific relocations handled below.... */
1605 slot
= get_relocation_slot (howto
->type
);
1606 if (slot
== XTENSA_UNDEFINED
)
1608 *error_message
= "unexpected relocation";
1609 return bfd_reloc_dangerous
;
1612 /* Read the instruction into a buffer and decode the opcode. */
1613 xtensa_insnbuf_from_chars (isa
, ibuff
, contents
+ address
,
1614 input_size
- address
);
1615 fmt
= xtensa_format_decode (isa
, ibuff
);
1616 if (fmt
== XTENSA_UNDEFINED
)
1618 *error_message
= "cannot decode instruction format";
1619 return bfd_reloc_dangerous
;
1622 xtensa_format_get_slot (isa
, fmt
, slot
, ibuff
, sbuff
);
1624 opcode
= xtensa_opcode_decode (isa
, fmt
, slot
, sbuff
);
1625 if (opcode
== XTENSA_UNDEFINED
)
1627 *error_message
= "cannot decode instruction opcode";
1628 return bfd_reloc_dangerous
;
1631 /* Check for opcode-specific "alternate" relocations. */
1632 if (is_alt_relocation (howto
->type
))
1634 if (opcode
== get_l32r_opcode ())
1636 /* Handle the special-case of non-PC-relative L32R instructions. */
1637 bfd
*output_bfd
= input_section
->output_section
->owner
;
1638 asection
*lit4_sec
= bfd_get_section_by_name (output_bfd
, ".lit4");
1641 *error_message
= "relocation references missing .lit4 section";
1642 return bfd_reloc_dangerous
;
1644 self_address
= ((lit4_sec
->vma
& ~0xfff)
1645 + 0x40000 - 3); /* -3 to compensate for do_reloc */
1646 newval
= relocation
;
1649 else if (opcode
== get_const16_opcode ())
1651 /* ALT used for high 16 bits. */
1652 newval
= relocation
>> 16;
1657 /* No other "alternate" relocations currently defined. */
1658 *error_message
= "unexpected relocation";
1659 return bfd_reloc_dangerous
;
1662 else /* Not an "alternate" relocation.... */
1664 if (opcode
== get_const16_opcode ())
1666 newval
= relocation
& 0xffff;
1671 /* ...normal PC-relative relocation.... */
1673 /* Determine which operand is being relocated. */
1674 opnd
= get_relocation_opnd (opcode
, howto
->type
);
1675 if (opnd
== XTENSA_UNDEFINED
)
1677 *error_message
= "unexpected relocation";
1678 return bfd_reloc_dangerous
;
1681 if (!howto
->pc_relative
)
1683 *error_message
= "expected PC-relative relocation";
1684 return bfd_reloc_dangerous
;
1687 /* Calculate the PC address for this instruction. */
1688 self_address
= (input_section
->output_section
->vma
1689 + input_section
->output_offset
1692 newval
= relocation
;
1696 /* Apply the relocation. */
1697 if (xtensa_operand_do_reloc (isa
, opcode
, opnd
, &newval
, self_address
)
1698 || xtensa_operand_encode (isa
, opcode
, opnd
, &newval
)
1699 || xtensa_operand_set_field (isa
, opcode
, opnd
, fmt
, slot
,
1702 const char *opname
= xtensa_opcode_name (isa
, opcode
);
1705 msg
= "cannot encode";
1706 if (is_direct_call_opcode (opcode
))
1708 if ((relocation
& 0x3) != 0)
1709 msg
= "misaligned call target";
1711 msg
= "call target out of range";
1713 else if (opcode
== get_l32r_opcode ())
1715 if ((relocation
& 0x3) != 0)
1716 msg
= "misaligned literal target";
1717 else if (is_alt_relocation (howto
->type
))
1718 msg
= "literal target out of range (too many literals)";
1719 else if (self_address
> relocation
)
1720 msg
= "literal target out of range (try using text-section-literals)";
1722 msg
= "literal placed after use";
1725 *error_message
= vsprint_msg (opname
, ": %s", strlen (msg
) + 2, msg
);
1726 return bfd_reloc_dangerous
;
1729 /* Check for calls across 1GB boundaries. */
1730 if (is_direct_call_opcode (opcode
)
1731 && is_windowed_call_opcode (opcode
))
1733 if ((self_address
>> CALL_SEGMENT_BITS
)
1734 != (relocation
>> CALL_SEGMENT_BITS
))
1737 "windowed call crosses 1GB boundary; return may fail";
1738 return bfd_reloc_dangerous
;
1742 /* Write the modified instruction back out of the buffer. */
1743 xtensa_format_set_slot (isa
, fmt
, slot
, ibuff
, sbuff
);
1744 xtensa_insnbuf_to_chars (isa
, ibuff
, contents
+ address
,
1745 input_size
- address
);
1746 return bfd_reloc_ok
;
1751 vsprint_msg (const char *origmsg
, const char *fmt
, int arglen
, ...)
1753 /* To reduce the size of the memory leak,
1754 we only use a single message buffer. */
1755 static bfd_size_type alloc_size
= 0;
1756 static char *message
= NULL
;
1757 bfd_size_type orig_len
, len
= 0;
1758 bfd_boolean is_append
;
1760 VA_OPEN (ap
, arglen
);
1761 VA_FIXEDARG (ap
, const char *, origmsg
);
1763 is_append
= (origmsg
== message
);
1765 orig_len
= strlen (origmsg
);
1766 len
= orig_len
+ strlen (fmt
) + arglen
+ 20;
1767 if (len
> alloc_size
)
1769 message
= (char *) bfd_realloc (message
, len
);
1773 memcpy (message
, origmsg
, orig_len
);
1774 vsprintf (message
+ orig_len
, fmt
, ap
);
1780 /* This function is registered as the "special_function" in the
1781 Xtensa howto for handling simplify operations.
1782 bfd_perform_relocation / bfd_install_relocation use it to
1783 perform (install) the specified relocation. Since this replaces the code
1784 in bfd_perform_relocation, it is basically an Xtensa-specific,
1785 stripped-down version of bfd_perform_relocation. */
1787 static bfd_reloc_status_type
1788 bfd_elf_xtensa_reloc (bfd
*abfd
,
1789 arelent
*reloc_entry
,
1792 asection
*input_section
,
1794 char **error_message
)
1797 bfd_reloc_status_type flag
;
1798 bfd_size_type octets
= reloc_entry
->address
* bfd_octets_per_byte (abfd
);
1799 bfd_vma output_base
= 0;
1800 reloc_howto_type
*howto
= reloc_entry
->howto
;
1801 asection
*reloc_target_output_section
;
1802 bfd_boolean is_weak_undef
;
1804 if (!xtensa_default_isa
)
1805 xtensa_default_isa
= xtensa_isa_init (0, 0);
1807 /* ELF relocs are against symbols. If we are producing relocatable
1808 output, and the reloc is against an external symbol, the resulting
1809 reloc will also be against the same symbol. In such a case, we
1810 don't want to change anything about the way the reloc is handled,
1811 since it will all be done at final link time. This test is similar
1812 to what bfd_elf_generic_reloc does except that it lets relocs with
1813 howto->partial_inplace go through even if the addend is non-zero.
1814 (The real problem is that partial_inplace is set for XTENSA_32
1815 relocs to begin with, but that's a long story and there's little we
1816 can do about it now....) */
1818 if (output_bfd
&& (symbol
->flags
& BSF_SECTION_SYM
) == 0)
1820 reloc_entry
->address
+= input_section
->output_offset
;
1821 return bfd_reloc_ok
;
1824 /* Is the address of the relocation really within the section? */
1825 if (reloc_entry
->address
> bfd_get_section_limit (abfd
, input_section
))
1826 return bfd_reloc_outofrange
;
1828 /* Work out which section the relocation is targeted at and the
1829 initial relocation command value. */
1831 /* Get symbol value. (Common symbols are special.) */
1832 if (bfd_is_com_section (symbol
->section
))
1835 relocation
= symbol
->value
;
1837 reloc_target_output_section
= symbol
->section
->output_section
;
1839 /* Convert input-section-relative symbol value to absolute. */
1840 if ((output_bfd
&& !howto
->partial_inplace
)
1841 || reloc_target_output_section
== NULL
)
1844 output_base
= reloc_target_output_section
->vma
;
1846 relocation
+= output_base
+ symbol
->section
->output_offset
;
1848 /* Add in supplied addend. */
1849 relocation
+= reloc_entry
->addend
;
1851 /* Here the variable relocation holds the final address of the
1852 symbol we are relocating against, plus any addend. */
1855 if (!howto
->partial_inplace
)
1857 /* This is a partial relocation, and we want to apply the relocation
1858 to the reloc entry rather than the raw data. Everything except
1859 relocations against section symbols has already been handled
1862 BFD_ASSERT (symbol
->flags
& BSF_SECTION_SYM
);
1863 reloc_entry
->addend
= relocation
;
1864 reloc_entry
->address
+= input_section
->output_offset
;
1865 return bfd_reloc_ok
;
1869 reloc_entry
->address
+= input_section
->output_offset
;
1870 reloc_entry
->addend
= 0;
1874 is_weak_undef
= (bfd_is_und_section (symbol
->section
)
1875 && (symbol
->flags
& BSF_WEAK
) != 0);
1876 flag
= elf_xtensa_do_reloc (howto
, abfd
, input_section
, relocation
,
1877 (bfd_byte
*) data
, (bfd_vma
) octets
,
1878 is_weak_undef
, error_message
);
1880 if (flag
== bfd_reloc_dangerous
)
1882 /* Add the symbol name to the error message. */
1883 if (! *error_message
)
1884 *error_message
= "";
1885 *error_message
= vsprint_msg (*error_message
, ": (%s + 0x%lx)",
1886 strlen (symbol
->name
) + 17,
1888 (unsigned long) reloc_entry
->addend
);
1895 /* Set up an entry in the procedure linkage table. */
1898 elf_xtensa_create_plt_entry (struct bfd_link_info
*info
,
1900 unsigned reloc_index
)
1902 asection
*splt
, *sgotplt
;
1903 bfd_vma plt_base
, got_base
;
1904 bfd_vma code_offset
, lit_offset
;
1907 chunk
= reloc_index
/ PLT_ENTRIES_PER_CHUNK
;
1908 splt
= elf_xtensa_get_plt_section (info
, chunk
);
1909 sgotplt
= elf_xtensa_get_gotplt_section (info
, chunk
);
1910 BFD_ASSERT (splt
!= NULL
&& sgotplt
!= NULL
);
1912 plt_base
= splt
->output_section
->vma
+ splt
->output_offset
;
1913 got_base
= sgotplt
->output_section
->vma
+ sgotplt
->output_offset
;
1915 lit_offset
= 8 + (reloc_index
% PLT_ENTRIES_PER_CHUNK
) * 4;
1916 code_offset
= (reloc_index
% PLT_ENTRIES_PER_CHUNK
) * PLT_ENTRY_SIZE
;
1918 /* Fill in the literal entry. This is the offset of the dynamic
1919 relocation entry. */
1920 bfd_put_32 (output_bfd
, reloc_index
* sizeof (Elf32_External_Rela
),
1921 sgotplt
->contents
+ lit_offset
);
1923 /* Fill in the entry in the procedure linkage table. */
1924 memcpy (splt
->contents
+ code_offset
,
1925 (bfd_big_endian (output_bfd
)
1926 ? elf_xtensa_be_plt_entry
1927 : elf_xtensa_le_plt_entry
),
1929 bfd_put_16 (output_bfd
, l32r_offset (got_base
+ 0,
1930 plt_base
+ code_offset
+ 3),
1931 splt
->contents
+ code_offset
+ 4);
1932 bfd_put_16 (output_bfd
, l32r_offset (got_base
+ 4,
1933 plt_base
+ code_offset
+ 6),
1934 splt
->contents
+ code_offset
+ 7);
1935 bfd_put_16 (output_bfd
, l32r_offset (got_base
+ lit_offset
,
1936 plt_base
+ code_offset
+ 9),
1937 splt
->contents
+ code_offset
+ 10);
1939 return plt_base
+ code_offset
;
1943 /* Relocate an Xtensa ELF section. This is invoked by the linker for
1944 both relocatable and final links. */
1947 elf_xtensa_relocate_section (bfd
*output_bfd
,
1948 struct bfd_link_info
*info
,
1950 asection
*input_section
,
1952 Elf_Internal_Rela
*relocs
,
1953 Elf_Internal_Sym
*local_syms
,
1954 asection
**local_sections
)
1956 struct elf_xtensa_link_hash_table
*htab
;
1957 Elf_Internal_Shdr
*symtab_hdr
;
1958 Elf_Internal_Rela
*rel
;
1959 Elf_Internal_Rela
*relend
;
1960 struct elf_link_hash_entry
**sym_hashes
;
1961 property_table_entry
*lit_table
= 0;
1963 char *error_message
= NULL
;
1964 bfd_size_type input_size
;
1966 if (!xtensa_default_isa
)
1967 xtensa_default_isa
= xtensa_isa_init (0, 0);
1969 htab
= elf_xtensa_hash_table (info
);
1970 symtab_hdr
= &elf_tdata (input_bfd
)->symtab_hdr
;
1971 sym_hashes
= elf_sym_hashes (input_bfd
);
1973 if (elf_hash_table (info
)->dynamic_sections_created
)
1975 ltblsize
= xtensa_read_table_entries (input_bfd
, input_section
,
1976 &lit_table
, XTENSA_LIT_SEC_NAME
,
1982 input_size
= bfd_get_section_limit (input_bfd
, input_section
);
1985 relend
= relocs
+ input_section
->reloc_count
;
1986 for (; rel
< relend
; rel
++)
1989 reloc_howto_type
*howto
;
1990 unsigned long r_symndx
;
1991 struct elf_link_hash_entry
*h
;
1992 Elf_Internal_Sym
*sym
;
1995 bfd_reloc_status_type r
;
1996 bfd_boolean is_weak_undef
;
1997 bfd_boolean unresolved_reloc
;
2000 r_type
= ELF32_R_TYPE (rel
->r_info
);
2001 if (r_type
== (int) R_XTENSA_GNU_VTINHERIT
2002 || r_type
== (int) R_XTENSA_GNU_VTENTRY
)
2005 if (r_type
< 0 || r_type
>= (int) R_XTENSA_max
)
2007 bfd_set_error (bfd_error_bad_value
);
2010 howto
= &elf_howto_table
[r_type
];
2012 r_symndx
= ELF32_R_SYM (rel
->r_info
);
2017 is_weak_undef
= FALSE
;
2018 unresolved_reloc
= FALSE
;
2021 if (howto
->partial_inplace
&& !info
->relocatable
)
2023 /* Because R_XTENSA_32 was made partial_inplace to fix some
2024 problems with DWARF info in partial links, there may be
2025 an addend stored in the contents. Take it out of there
2026 and move it back into the addend field of the reloc. */
2027 rel
->r_addend
+= bfd_get_32 (input_bfd
, contents
+ rel
->r_offset
);
2028 bfd_put_32 (input_bfd
, 0, contents
+ rel
->r_offset
);
2031 if (r_symndx
< symtab_hdr
->sh_info
)
2033 sym
= local_syms
+ r_symndx
;
2034 sec
= local_sections
[r_symndx
];
2035 relocation
= _bfd_elf_rela_local_sym (output_bfd
, sym
, &sec
, rel
);
2039 RELOC_FOR_GLOBAL_SYMBOL (info
, input_bfd
, input_section
, rel
,
2040 r_symndx
, symtab_hdr
, sym_hashes
,
2042 unresolved_reloc
, warned
);
2045 && !unresolved_reloc
2046 && h
->root
.type
== bfd_link_hash_undefweak
)
2047 is_weak_undef
= TRUE
;
2050 if (sec
!= NULL
&& elf_discarded_section (sec
))
2052 /* For relocs against symbols from removed linkonce sections,
2053 or sections discarded by a linker script, we just want the
2054 section contents zeroed. Avoid any special processing. */
2055 _bfd_clear_contents (howto
, input_bfd
, contents
+ rel
->r_offset
);
2061 if (info
->relocatable
)
2063 /* This is a relocatable link.
2064 1) If the reloc is against a section symbol, adjust
2065 according to the output section.
2066 2) If there is a new target for this relocation,
2067 the new target will be in the same output section.
2068 We adjust the relocation by the output section
2071 if (relaxing_section
)
2073 /* Check if this references a section in another input file. */
2074 if (!do_fix_for_relocatable_link (rel
, input_bfd
, input_section
,
2077 r_type
= ELF32_R_TYPE (rel
->r_info
);
2080 if (r_type
== R_XTENSA_ASM_SIMPLIFY
)
2082 char *error_message
= NULL
;
2083 /* Convert ASM_SIMPLIFY into the simpler relocation
2084 so that they never escape a relaxing link. */
2085 r
= contract_asm_expansion (contents
, input_size
, rel
,
2087 if (r
!= bfd_reloc_ok
)
2089 if (!((*info
->callbacks
->reloc_dangerous
)
2090 (info
, error_message
, input_bfd
, input_section
,
2094 r_type
= ELF32_R_TYPE (rel
->r_info
);
2097 /* This is a relocatable link, so we don't have to change
2098 anything unless the reloc is against a section symbol,
2099 in which case we have to adjust according to where the
2100 section symbol winds up in the output section. */
2101 if (r_symndx
< symtab_hdr
->sh_info
)
2103 sym
= local_syms
+ r_symndx
;
2104 if (ELF_ST_TYPE (sym
->st_info
) == STT_SECTION
)
2106 sec
= local_sections
[r_symndx
];
2107 rel
->r_addend
+= sec
->output_offset
+ sym
->st_value
;
2111 /* If there is an addend with a partial_inplace howto,
2112 then move the addend to the contents. This is a hack
2113 to work around problems with DWARF in relocatable links
2114 with some previous version of BFD. Now we can't easily get
2115 rid of the hack without breaking backward compatibility.... */
2118 howto
= &elf_howto_table
[r_type
];
2119 if (howto
->partial_inplace
)
2121 r
= elf_xtensa_do_reloc (howto
, input_bfd
, input_section
,
2122 rel
->r_addend
, contents
,
2123 rel
->r_offset
, FALSE
,
2125 if (r
!= bfd_reloc_ok
)
2127 if (!((*info
->callbacks
->reloc_dangerous
)
2128 (info
, error_message
, input_bfd
, input_section
,
2136 /* Done with work for relocatable link; continue with next reloc. */
2140 /* This is a final link. */
2142 if (relaxing_section
)
2144 /* Check if this references a section in another input file. */
2145 do_fix_for_final_link (rel
, input_bfd
, input_section
, contents
,
2148 /* Update some already cached values. */
2149 r_type
= ELF32_R_TYPE (rel
->r_info
);
2150 howto
= &elf_howto_table
[r_type
];
2153 /* Sanity check the address. */
2154 if (rel
->r_offset
>= input_size
2155 && ELF32_R_TYPE (rel
->r_info
) != R_XTENSA_NONE
)
2157 (*_bfd_error_handler
)
2158 (_("%B(%A+0x%lx): relocation offset out of range (size=0x%x)"),
2159 input_bfd
, input_section
, rel
->r_offset
, input_size
);
2160 bfd_set_error (bfd_error_bad_value
);
2164 /* Generate dynamic relocations. */
2165 if (elf_hash_table (info
)->dynamic_sections_created
)
2167 bfd_boolean dynamic_symbol
= elf_xtensa_dynamic_symbol_p (h
, info
);
2169 if (dynamic_symbol
&& is_operand_relocation (r_type
))
2171 /* This is an error. The symbol's real value won't be known
2172 until runtime and it's likely to be out of range anyway. */
2173 const char *name
= h
->root
.root
.string
;
2174 error_message
= vsprint_msg ("invalid relocation for dynamic "
2176 strlen (name
) + 2, name
);
2177 if (!((*info
->callbacks
->reloc_dangerous
)
2178 (info
, error_message
, input_bfd
, input_section
,
2182 else if ((r_type
== R_XTENSA_32
|| r_type
== R_XTENSA_PLT
)
2183 && (input_section
->flags
& SEC_ALLOC
) != 0
2184 && (dynamic_symbol
|| info
->shared
))
2186 Elf_Internal_Rela outrel
;
2190 if (dynamic_symbol
&& r_type
== R_XTENSA_PLT
)
2191 srel
= htab
->srelplt
;
2193 srel
= htab
->srelgot
;
2195 BFD_ASSERT (srel
!= NULL
);
2198 _bfd_elf_section_offset (output_bfd
, info
,
2199 input_section
, rel
->r_offset
);
2201 if ((outrel
.r_offset
| 1) == (bfd_vma
) -1)
2202 memset (&outrel
, 0, sizeof outrel
);
2205 outrel
.r_offset
+= (input_section
->output_section
->vma
2206 + input_section
->output_offset
);
2208 /* Complain if the relocation is in a read-only section
2209 and not in a literal pool. */
2210 if ((input_section
->flags
& SEC_READONLY
) != 0
2211 && !elf_xtensa_in_literal_pool (lit_table
, ltblsize
,
2215 _("dynamic relocation in read-only section");
2216 if (!((*info
->callbacks
->reloc_dangerous
)
2217 (info
, error_message
, input_bfd
, input_section
,
2224 outrel
.r_addend
= rel
->r_addend
;
2227 if (r_type
== R_XTENSA_32
)
2230 ELF32_R_INFO (h
->dynindx
, R_XTENSA_GLOB_DAT
);
2233 else /* r_type == R_XTENSA_PLT */
2236 ELF32_R_INFO (h
->dynindx
, R_XTENSA_JMP_SLOT
);
2238 /* Create the PLT entry and set the initial
2239 contents of the literal entry to the address of
2242 elf_xtensa_create_plt_entry (info
, output_bfd
,
2245 unresolved_reloc
= FALSE
;
2249 /* Generate a RELATIVE relocation. */
2250 outrel
.r_info
= ELF32_R_INFO (0, R_XTENSA_RELATIVE
);
2251 outrel
.r_addend
= 0;
2255 loc
= (srel
->contents
2256 + srel
->reloc_count
++ * sizeof (Elf32_External_Rela
));
2257 bfd_elf32_swap_reloca_out (output_bfd
, &outrel
, loc
);
2258 BFD_ASSERT (sizeof (Elf32_External_Rela
) * srel
->reloc_count
2263 /* Dynamic relocs are not propagated for SEC_DEBUGGING sections
2264 because such sections are not SEC_ALLOC and thus ld.so will
2265 not process them. */
2266 if (unresolved_reloc
2267 && !((input_section
->flags
& SEC_DEBUGGING
) != 0
2270 (*_bfd_error_handler
)
2271 (_("%B(%A+0x%lx): unresolvable %s relocation against symbol `%s'"),
2274 (long) rel
->r_offset
,
2276 h
->root
.root
.string
);
2280 /* There's no point in calling bfd_perform_relocation here.
2281 Just go directly to our "special function". */
2282 r
= elf_xtensa_do_reloc (howto
, input_bfd
, input_section
,
2283 relocation
+ rel
->r_addend
,
2284 contents
, rel
->r_offset
, is_weak_undef
,
2287 if (r
!= bfd_reloc_ok
&& !warned
)
2291 BFD_ASSERT (r
== bfd_reloc_dangerous
|| r
== bfd_reloc_other
);
2292 BFD_ASSERT (error_message
!= NULL
);
2295 name
= h
->root
.root
.string
;
2298 name
= bfd_elf_string_from_elf_section
2299 (input_bfd
, symtab_hdr
->sh_link
, sym
->st_name
);
2300 if (name
&& *name
== '\0')
2301 name
= bfd_section_name (input_bfd
, sec
);
2305 if (rel
->r_addend
== 0)
2306 error_message
= vsprint_msg (error_message
, ": %s",
2307 strlen (name
) + 2, name
);
2309 error_message
= vsprint_msg (error_message
, ": (%s+0x%x)",
2311 name
, (int)rel
->r_addend
);
2314 if (!((*info
->callbacks
->reloc_dangerous
)
2315 (info
, error_message
, input_bfd
, input_section
,
2324 input_section
->reloc_done
= TRUE
;
2330 /* Finish up dynamic symbol handling. There's not much to do here since
2331 the PLT and GOT entries are all set up by relocate_section. */
2334 elf_xtensa_finish_dynamic_symbol (bfd
*output_bfd ATTRIBUTE_UNUSED
,
2335 struct bfd_link_info
*info ATTRIBUTE_UNUSED
,
2336 struct elf_link_hash_entry
*h
,
2337 Elf_Internal_Sym
*sym
)
2339 if (h
->needs_plt
&& !h
->def_regular
)
2341 /* Mark the symbol as undefined, rather than as defined in
2342 the .plt section. Leave the value alone. */
2343 sym
->st_shndx
= SHN_UNDEF
;
2344 /* If the symbol is weak, we do need to clear the value.
2345 Otherwise, the PLT entry would provide a definition for
2346 the symbol even if the symbol wasn't defined anywhere,
2347 and so the symbol would never be NULL. */
2348 if (!h
->ref_regular_nonweak
)
2352 /* Mark _DYNAMIC and _GLOBAL_OFFSET_TABLE_ as absolute. */
2353 if (strcmp (h
->root
.root
.string
, "_DYNAMIC") == 0
2354 || h
== elf_hash_table (info
)->hgot
)
2355 sym
->st_shndx
= SHN_ABS
;
2361 /* Combine adjacent literal table entries in the output. Adjacent
2362 entries within each input section may have been removed during
2363 relaxation, but we repeat the process here, even though it's too late
2364 to shrink the output section, because it's important to minimize the
2365 number of literal table entries to reduce the start-up work for the
2366 runtime linker. Returns the number of remaining table entries or -1
2370 elf_xtensa_combine_prop_entries (bfd
*output_bfd
,
2375 property_table_entry
*table
;
2376 bfd_size_type section_size
, sgotloc_size
;
2380 section_size
= sxtlit
->size
;
2381 BFD_ASSERT (section_size
% 8 == 0);
2382 num
= section_size
/ 8;
2384 sgotloc_size
= sgotloc
->size
;
2385 if (sgotloc_size
!= section_size
)
2387 (*_bfd_error_handler
)
2388 (_("internal inconsistency in size of .got.loc section"));
2392 table
= bfd_malloc (num
* sizeof (property_table_entry
));
2396 /* The ".xt.lit.plt" section has the SEC_IN_MEMORY flag set and this
2397 propagates to the output section, where it doesn't really apply and
2398 where it breaks the following call to bfd_malloc_and_get_section. */
2399 sxtlit
->flags
&= ~SEC_IN_MEMORY
;
2401 if (!bfd_malloc_and_get_section (output_bfd
, sxtlit
, &contents
))
2409 /* There should never be any relocations left at this point, so this
2410 is quite a bit easier than what is done during relaxation. */
2412 /* Copy the raw contents into a property table array and sort it. */
2414 for (n
= 0; n
< num
; n
++)
2416 table
[n
].address
= bfd_get_32 (output_bfd
, &contents
[offset
]);
2417 table
[n
].size
= bfd_get_32 (output_bfd
, &contents
[offset
+ 4]);
2420 qsort (table
, num
, sizeof (property_table_entry
), property_table_compare
);
2422 for (n
= 0; n
< num
; n
++)
2424 bfd_boolean remove
= FALSE
;
2426 if (table
[n
].size
== 0)
2429 (table
[n
-1].address
+ table
[n
-1].size
== table
[n
].address
))
2431 table
[n
-1].size
+= table
[n
].size
;
2437 for (m
= n
; m
< num
- 1; m
++)
2439 table
[m
].address
= table
[m
+1].address
;
2440 table
[m
].size
= table
[m
+1].size
;
2448 /* Copy the data back to the raw contents. */
2450 for (n
= 0; n
< num
; n
++)
2452 bfd_put_32 (output_bfd
, table
[n
].address
, &contents
[offset
]);
2453 bfd_put_32 (output_bfd
, table
[n
].size
, &contents
[offset
+ 4]);
2457 /* Clear the removed bytes. */
2458 if ((bfd_size_type
) (num
* 8) < section_size
)
2459 memset (&contents
[num
* 8], 0, section_size
- num
* 8);
2461 if (! bfd_set_section_contents (output_bfd
, sxtlit
, contents
, 0,
2465 /* Copy the contents to ".got.loc". */
2466 memcpy (sgotloc
->contents
, contents
, section_size
);
2474 /* Finish up the dynamic sections. */
2477 elf_xtensa_finish_dynamic_sections (bfd
*output_bfd
,
2478 struct bfd_link_info
*info
)
2480 struct elf_xtensa_link_hash_table
*htab
;
2482 asection
*sdyn
, *srelplt
, *sgot
, *sxtlit
, *sgotloc
;
2483 Elf32_External_Dyn
*dyncon
, *dynconend
;
2484 int num_xtlit_entries
;
2486 if (! elf_hash_table (info
)->dynamic_sections_created
)
2489 htab
= elf_xtensa_hash_table (info
);
2490 dynobj
= elf_hash_table (info
)->dynobj
;
2491 sdyn
= bfd_get_section_by_name (dynobj
, ".dynamic");
2492 BFD_ASSERT (sdyn
!= NULL
);
2494 /* Set the first entry in the global offset table to the address of
2495 the dynamic section. */
2499 BFD_ASSERT (sgot
->size
== 4);
2501 bfd_put_32 (output_bfd
, 0, sgot
->contents
);
2503 bfd_put_32 (output_bfd
,
2504 sdyn
->output_section
->vma
+ sdyn
->output_offset
,
2508 srelplt
= htab
->srelplt
;
2509 if (srelplt
&& srelplt
->size
!= 0)
2511 asection
*sgotplt
, *srelgot
, *spltlittbl
;
2512 int chunk
, plt_chunks
, plt_entries
;
2513 Elf_Internal_Rela irela
;
2515 unsigned rtld_reloc
;
2517 srelgot
= htab
->srelgot
;
2518 spltlittbl
= htab
->spltlittbl
;
2519 BFD_ASSERT (srelgot
!= NULL
&& spltlittbl
!= NULL
);
2521 /* Find the first XTENSA_RTLD relocation. Presumably the rest
2522 of them follow immediately after.... */
2523 for (rtld_reloc
= 0; rtld_reloc
< srelgot
->reloc_count
; rtld_reloc
++)
2525 loc
= srelgot
->contents
+ rtld_reloc
* sizeof (Elf32_External_Rela
);
2526 bfd_elf32_swap_reloca_in (output_bfd
, loc
, &irela
);
2527 if (ELF32_R_TYPE (irela
.r_info
) == R_XTENSA_RTLD
)
2530 BFD_ASSERT (rtld_reloc
< srelgot
->reloc_count
);
2532 plt_entries
= srelplt
->size
/ sizeof (Elf32_External_Rela
);
2534 (plt_entries
+ PLT_ENTRIES_PER_CHUNK
- 1) / PLT_ENTRIES_PER_CHUNK
;
2536 for (chunk
= 0; chunk
< plt_chunks
; chunk
++)
2538 int chunk_entries
= 0;
2540 sgotplt
= elf_xtensa_get_gotplt_section (info
, chunk
);
2541 BFD_ASSERT (sgotplt
!= NULL
);
2543 /* Emit special RTLD relocations for the first two entries in
2544 each chunk of the .got.plt section. */
2546 loc
= srelgot
->contents
+ rtld_reloc
* sizeof (Elf32_External_Rela
);
2547 bfd_elf32_swap_reloca_in (output_bfd
, loc
, &irela
);
2548 BFD_ASSERT (ELF32_R_TYPE (irela
.r_info
) == R_XTENSA_RTLD
);
2549 irela
.r_offset
= (sgotplt
->output_section
->vma
2550 + sgotplt
->output_offset
);
2551 irela
.r_addend
= 1; /* tell rtld to set value to resolver function */
2552 bfd_elf32_swap_reloca_out (output_bfd
, &irela
, loc
);
2554 BFD_ASSERT (rtld_reloc
<= srelgot
->reloc_count
);
2556 /* Next literal immediately follows the first. */
2557 loc
+= sizeof (Elf32_External_Rela
);
2558 bfd_elf32_swap_reloca_in (output_bfd
, loc
, &irela
);
2559 BFD_ASSERT (ELF32_R_TYPE (irela
.r_info
) == R_XTENSA_RTLD
);
2560 irela
.r_offset
= (sgotplt
->output_section
->vma
2561 + sgotplt
->output_offset
+ 4);
2562 /* Tell rtld to set value to object's link map. */
2564 bfd_elf32_swap_reloca_out (output_bfd
, &irela
, loc
);
2566 BFD_ASSERT (rtld_reloc
<= srelgot
->reloc_count
);
2568 /* Fill in the literal table. */
2569 if (chunk
< plt_chunks
- 1)
2570 chunk_entries
= PLT_ENTRIES_PER_CHUNK
;
2572 chunk_entries
= plt_entries
- (chunk
* PLT_ENTRIES_PER_CHUNK
);
2574 BFD_ASSERT ((unsigned) (chunk
+ 1) * 8 <= spltlittbl
->size
);
2575 bfd_put_32 (output_bfd
,
2576 sgotplt
->output_section
->vma
+ sgotplt
->output_offset
,
2577 spltlittbl
->contents
+ (chunk
* 8) + 0);
2578 bfd_put_32 (output_bfd
,
2579 8 + (chunk_entries
* 4),
2580 spltlittbl
->contents
+ (chunk
* 8) + 4);
2583 /* All the dynamic relocations have been emitted at this point.
2584 Make sure the relocation sections are the correct size. */
2585 if (srelgot
->size
!= (sizeof (Elf32_External_Rela
)
2586 * srelgot
->reloc_count
)
2587 || srelplt
->size
!= (sizeof (Elf32_External_Rela
)
2588 * srelplt
->reloc_count
))
2591 /* The .xt.lit.plt section has just been modified. This must
2592 happen before the code below which combines adjacent literal
2593 table entries, and the .xt.lit.plt contents have to be forced to
2595 if (! bfd_set_section_contents (output_bfd
,
2596 spltlittbl
->output_section
,
2597 spltlittbl
->contents
,
2598 spltlittbl
->output_offset
,
2601 /* Clear SEC_HAS_CONTENTS so the contents won't be output again. */
2602 spltlittbl
->flags
&= ~SEC_HAS_CONTENTS
;
2605 /* Combine adjacent literal table entries. */
2606 BFD_ASSERT (! info
->relocatable
);
2607 sxtlit
= bfd_get_section_by_name (output_bfd
, ".xt.lit");
2608 sgotloc
= htab
->sgotloc
;
2609 BFD_ASSERT (sxtlit
&& sgotloc
);
2611 elf_xtensa_combine_prop_entries (output_bfd
, sxtlit
, sgotloc
);
2612 if (num_xtlit_entries
< 0)
2615 dyncon
= (Elf32_External_Dyn
*) sdyn
->contents
;
2616 dynconend
= (Elf32_External_Dyn
*) (sdyn
->contents
+ sdyn
->size
);
2617 for (; dyncon
< dynconend
; dyncon
++)
2619 Elf_Internal_Dyn dyn
;
2621 bfd_elf32_swap_dyn_in (dynobj
, dyncon
, &dyn
);
2628 case DT_XTENSA_GOT_LOC_SZ
:
2629 dyn
.d_un
.d_val
= num_xtlit_entries
;
2632 case DT_XTENSA_GOT_LOC_OFF
:
2633 dyn
.d_un
.d_ptr
= htab
->sgotloc
->vma
;
2637 dyn
.d_un
.d_ptr
= htab
->sgot
->vma
;
2641 dyn
.d_un
.d_ptr
= htab
->srelplt
->vma
;
2645 dyn
.d_un
.d_val
= htab
->srelplt
->size
;
2649 /* Adjust RELASZ to not include JMPREL. This matches what
2650 glibc expects and what is done for several other ELF
2651 targets (e.g., i386, alpha), but the "correct" behavior
2652 seems to be unresolved. Since the linker script arranges
2653 for .rela.plt to follow all other relocation sections, we
2654 don't have to worry about changing the DT_RELA entry. */
2656 dyn
.d_un
.d_val
-= htab
->srelplt
->size
;
2660 bfd_elf32_swap_dyn_out (output_bfd
, &dyn
, dyncon
);
2667 /* Functions for dealing with the e_flags field. */
2669 /* Merge backend specific data from an object file to the output
2670 object file when linking. */
2673 elf_xtensa_merge_private_bfd_data (bfd
*ibfd
, bfd
*obfd
)
2675 unsigned out_mach
, in_mach
;
2676 flagword out_flag
, in_flag
;
2678 /* Check if we have the same endianess. */
2679 if (!_bfd_generic_verify_endian_match (ibfd
, obfd
))
2682 /* Don't even pretend to support mixed-format linking. */
2683 if (bfd_get_flavour (ibfd
) != bfd_target_elf_flavour
2684 || bfd_get_flavour (obfd
) != bfd_target_elf_flavour
)
2687 out_flag
= elf_elfheader (obfd
)->e_flags
;
2688 in_flag
= elf_elfheader (ibfd
)->e_flags
;
2690 out_mach
= out_flag
& EF_XTENSA_MACH
;
2691 in_mach
= in_flag
& EF_XTENSA_MACH
;
2692 if (out_mach
!= in_mach
)
2694 (*_bfd_error_handler
)
2695 (_("%B: incompatible machine type. Output is 0x%x. Input is 0x%x"),
2696 ibfd
, out_mach
, in_mach
);
2697 bfd_set_error (bfd_error_wrong_format
);
2701 if (! elf_flags_init (obfd
))
2703 elf_flags_init (obfd
) = TRUE
;
2704 elf_elfheader (obfd
)->e_flags
= in_flag
;
2706 if (bfd_get_arch (obfd
) == bfd_get_arch (ibfd
)
2707 && bfd_get_arch_info (obfd
)->the_default
)
2708 return bfd_set_arch_mach (obfd
, bfd_get_arch (ibfd
),
2709 bfd_get_mach (ibfd
));
2714 if ((out_flag
& EF_XTENSA_XT_INSN
) != (in_flag
& EF_XTENSA_XT_INSN
))
2715 elf_elfheader (obfd
)->e_flags
&= (~ EF_XTENSA_XT_INSN
);
2717 if ((out_flag
& EF_XTENSA_XT_LIT
) != (in_flag
& EF_XTENSA_XT_LIT
))
2718 elf_elfheader (obfd
)->e_flags
&= (~ EF_XTENSA_XT_LIT
);
2725 elf_xtensa_set_private_flags (bfd
*abfd
, flagword flags
)
2727 BFD_ASSERT (!elf_flags_init (abfd
)
2728 || elf_elfheader (abfd
)->e_flags
== flags
);
2730 elf_elfheader (abfd
)->e_flags
|= flags
;
2731 elf_flags_init (abfd
) = TRUE
;
2738 elf_xtensa_print_private_bfd_data (bfd
*abfd
, void *farg
)
2740 FILE *f
= (FILE *) farg
;
2741 flagword e_flags
= elf_elfheader (abfd
)->e_flags
;
2743 fprintf (f
, "\nXtensa header:\n");
2744 if ((e_flags
& EF_XTENSA_MACH
) == E_XTENSA_MACH
)
2745 fprintf (f
, "\nMachine = Base\n");
2747 fprintf (f
, "\nMachine Id = 0x%x\n", e_flags
& EF_XTENSA_MACH
);
2749 fprintf (f
, "Insn tables = %s\n",
2750 (e_flags
& EF_XTENSA_XT_INSN
) ? "true" : "false");
2752 fprintf (f
, "Literal tables = %s\n",
2753 (e_flags
& EF_XTENSA_XT_LIT
) ? "true" : "false");
2755 return _bfd_elf_print_private_bfd_data (abfd
, farg
);
2759 /* Set the right machine number for an Xtensa ELF file. */
2762 elf_xtensa_object_p (bfd
*abfd
)
2765 unsigned long arch
= elf_elfheader (abfd
)->e_flags
& EF_XTENSA_MACH
;
2770 mach
= bfd_mach_xtensa
;
2776 (void) bfd_default_set_arch_mach (abfd
, bfd_arch_xtensa
, mach
);
2781 /* The final processing done just before writing out an Xtensa ELF object
2782 file. This gets the Xtensa architecture right based on the machine
2786 elf_xtensa_final_write_processing (bfd
*abfd
,
2787 bfd_boolean linker ATTRIBUTE_UNUSED
)
2792 switch (mach
= bfd_get_mach (abfd
))
2794 case bfd_mach_xtensa
:
2795 val
= E_XTENSA_MACH
;
2801 elf_elfheader (abfd
)->e_flags
&= (~ EF_XTENSA_MACH
);
2802 elf_elfheader (abfd
)->e_flags
|= val
;
2806 static enum elf_reloc_type_class
2807 elf_xtensa_reloc_type_class (const Elf_Internal_Rela
*rela
)
2809 switch ((int) ELF32_R_TYPE (rela
->r_info
))
2811 case R_XTENSA_RELATIVE
:
2812 return reloc_class_relative
;
2813 case R_XTENSA_JMP_SLOT
:
2814 return reloc_class_plt
;
2816 return reloc_class_normal
;
2822 elf_xtensa_discard_info_for_section (bfd
*abfd
,
2823 struct elf_reloc_cookie
*cookie
,
2824 struct bfd_link_info
*info
,
2828 bfd_vma section_size
;
2829 bfd_vma offset
, actual_offset
;
2830 bfd_size_type removed_bytes
= 0;
2831 bfd_size_type entry_size
;
2833 if (sec
->output_section
2834 && bfd_is_abs_section (sec
->output_section
))
2837 if (xtensa_is_proptable_section (sec
))
2842 section_size
= sec
->size
;
2843 if (section_size
== 0 || section_size
% entry_size
!= 0)
2846 contents
= retrieve_contents (abfd
, sec
, info
->keep_memory
);
2850 cookie
->rels
= retrieve_internal_relocs (abfd
, sec
, info
->keep_memory
);
2853 release_contents (sec
, contents
);
2857 /* Sort the relocations. They should already be in order when
2858 relaxation is enabled, but it might not be. */
2859 qsort (cookie
->rels
, sec
->reloc_count
, sizeof (Elf_Internal_Rela
),
2860 internal_reloc_compare
);
2862 cookie
->rel
= cookie
->rels
;
2863 cookie
->relend
= cookie
->rels
+ sec
->reloc_count
;
2865 for (offset
= 0; offset
< section_size
; offset
+= entry_size
)
2867 actual_offset
= offset
- removed_bytes
;
2869 /* The ...symbol_deleted_p function will skip over relocs but it
2870 won't adjust their offsets, so do that here. */
2871 while (cookie
->rel
< cookie
->relend
2872 && cookie
->rel
->r_offset
< offset
)
2874 cookie
->rel
->r_offset
-= removed_bytes
;
2878 while (cookie
->rel
< cookie
->relend
2879 && cookie
->rel
->r_offset
== offset
)
2881 if (bfd_elf_reloc_symbol_deleted_p (offset
, cookie
))
2883 /* Remove the table entry. (If the reloc type is NONE, then
2884 the entry has already been merged with another and deleted
2885 during relaxation.) */
2886 if (ELF32_R_TYPE (cookie
->rel
->r_info
) != R_XTENSA_NONE
)
2888 /* Shift the contents up. */
2889 if (offset
+ entry_size
< section_size
)
2890 memmove (&contents
[actual_offset
],
2891 &contents
[actual_offset
+ entry_size
],
2892 section_size
- offset
- entry_size
);
2893 removed_bytes
+= entry_size
;
2896 /* Remove this relocation. */
2897 cookie
->rel
->r_info
= ELF32_R_INFO (0, R_XTENSA_NONE
);
2900 /* Adjust the relocation offset for previous removals. This
2901 should not be done before calling ...symbol_deleted_p
2902 because it might mess up the offset comparisons there.
2903 Make sure the offset doesn't underflow in the case where
2904 the first entry is removed. */
2905 if (cookie
->rel
->r_offset
>= removed_bytes
)
2906 cookie
->rel
->r_offset
-= removed_bytes
;
2908 cookie
->rel
->r_offset
= 0;
2914 if (removed_bytes
!= 0)
2916 /* Adjust any remaining relocs (shouldn't be any). */
2917 for (; cookie
->rel
< cookie
->relend
; cookie
->rel
++)
2919 if (cookie
->rel
->r_offset
>= removed_bytes
)
2920 cookie
->rel
->r_offset
-= removed_bytes
;
2922 cookie
->rel
->r_offset
= 0;
2925 /* Clear the removed bytes. */
2926 memset (&contents
[section_size
- removed_bytes
], 0, removed_bytes
);
2928 pin_contents (sec
, contents
);
2929 pin_internal_relocs (sec
, cookie
->rels
);
2932 sec
->size
= section_size
- removed_bytes
;
2934 if (xtensa_is_littable_section (sec
))
2936 asection
*sgotloc
= elf_xtensa_hash_table (info
)->sgotloc
;
2938 sgotloc
->size
-= removed_bytes
;
2943 release_contents (sec
, contents
);
2944 release_internal_relocs (sec
, cookie
->rels
);
2947 return (removed_bytes
!= 0);
2952 elf_xtensa_discard_info (bfd
*abfd
,
2953 struct elf_reloc_cookie
*cookie
,
2954 struct bfd_link_info
*info
)
2957 bfd_boolean changed
= FALSE
;
2959 for (sec
= abfd
->sections
; sec
!= NULL
; sec
= sec
->next
)
2961 if (xtensa_is_property_section (sec
))
2963 if (elf_xtensa_discard_info_for_section (abfd
, cookie
, info
, sec
))
2973 elf_xtensa_ignore_discarded_relocs (asection
*sec
)
2975 return xtensa_is_property_section (sec
);
2980 elf_xtensa_action_discarded (asection
*sec
)
2982 if (strcmp (".xt_except_table", sec
->name
) == 0)
2985 if (strcmp (".xt_except_desc", sec
->name
) == 0)
2988 return _bfd_elf_default_action_discarded (sec
);
2992 /* Support for core dump NOTE sections. */
2995 elf_xtensa_grok_prstatus (bfd
*abfd
, Elf_Internal_Note
*note
)
3000 /* The size for Xtensa is variable, so don't try to recognize the format
3001 based on the size. Just assume this is GNU/Linux. */
3004 elf_tdata (abfd
)->core_signal
= bfd_get_16 (abfd
, note
->descdata
+ 12);
3007 elf_tdata (abfd
)->core_pid
= bfd_get_32 (abfd
, note
->descdata
+ 24);
3011 size
= note
->descsz
- offset
- 4;
3013 /* Make a ".reg/999" section. */
3014 return _bfd_elfcore_make_pseudosection (abfd
, ".reg",
3015 size
, note
->descpos
+ offset
);
3020 elf_xtensa_grok_psinfo (bfd
*abfd
, Elf_Internal_Note
*note
)
3022 switch (note
->descsz
)
3027 case 128: /* GNU/Linux elf_prpsinfo */
3028 elf_tdata (abfd
)->core_program
3029 = _bfd_elfcore_strndup (abfd
, note
->descdata
+ 32, 16);
3030 elf_tdata (abfd
)->core_command
3031 = _bfd_elfcore_strndup (abfd
, note
->descdata
+ 48, 80);
3034 /* Note that for some reason, a spurious space is tacked
3035 onto the end of the args in some (at least one anyway)
3036 implementations, so strip it off if it exists. */
3039 char *command
= elf_tdata (abfd
)->core_command
;
3040 int n
= strlen (command
);
3042 if (0 < n
&& command
[n
- 1] == ' ')
3043 command
[n
- 1] = '\0';
3050 /* Generic Xtensa configurability stuff. */
3052 static xtensa_opcode callx0_op
= XTENSA_UNDEFINED
;
3053 static xtensa_opcode callx4_op
= XTENSA_UNDEFINED
;
3054 static xtensa_opcode callx8_op
= XTENSA_UNDEFINED
;
3055 static xtensa_opcode callx12_op
= XTENSA_UNDEFINED
;
3056 static xtensa_opcode call0_op
= XTENSA_UNDEFINED
;
3057 static xtensa_opcode call4_op
= XTENSA_UNDEFINED
;
3058 static xtensa_opcode call8_op
= XTENSA_UNDEFINED
;
3059 static xtensa_opcode call12_op
= XTENSA_UNDEFINED
;
3062 init_call_opcodes (void)
3064 if (callx0_op
== XTENSA_UNDEFINED
)
3066 callx0_op
= xtensa_opcode_lookup (xtensa_default_isa
, "callx0");
3067 callx4_op
= xtensa_opcode_lookup (xtensa_default_isa
, "callx4");
3068 callx8_op
= xtensa_opcode_lookup (xtensa_default_isa
, "callx8");
3069 callx12_op
= xtensa_opcode_lookup (xtensa_default_isa
, "callx12");
3070 call0_op
= xtensa_opcode_lookup (xtensa_default_isa
, "call0");
3071 call4_op
= xtensa_opcode_lookup (xtensa_default_isa
, "call4");
3072 call8_op
= xtensa_opcode_lookup (xtensa_default_isa
, "call8");
3073 call12_op
= xtensa_opcode_lookup (xtensa_default_isa
, "call12");
3079 is_indirect_call_opcode (xtensa_opcode opcode
)
3081 init_call_opcodes ();
3082 return (opcode
== callx0_op
3083 || opcode
== callx4_op
3084 || opcode
== callx8_op
3085 || opcode
== callx12_op
);
3090 is_direct_call_opcode (xtensa_opcode opcode
)
3092 init_call_opcodes ();
3093 return (opcode
== call0_op
3094 || opcode
== call4_op
3095 || opcode
== call8_op
3096 || opcode
== call12_op
);
3101 is_windowed_call_opcode (xtensa_opcode opcode
)
3103 init_call_opcodes ();
3104 return (opcode
== call4_op
3105 || opcode
== call8_op
3106 || opcode
== call12_op
3107 || opcode
== callx4_op
3108 || opcode
== callx8_op
3109 || opcode
== callx12_op
);
3113 static xtensa_opcode
3114 get_const16_opcode (void)
3116 static bfd_boolean done_lookup
= FALSE
;
3117 static xtensa_opcode const16_opcode
= XTENSA_UNDEFINED
;
3120 const16_opcode
= xtensa_opcode_lookup (xtensa_default_isa
, "const16");
3123 return const16_opcode
;
3127 static xtensa_opcode
3128 get_l32r_opcode (void)
3130 static xtensa_opcode l32r_opcode
= XTENSA_UNDEFINED
;
3131 static bfd_boolean done_lookup
= FALSE
;
3135 l32r_opcode
= xtensa_opcode_lookup (xtensa_default_isa
, "l32r");
3143 l32r_offset (bfd_vma addr
, bfd_vma pc
)
3147 offset
= addr
- ((pc
+3) & -4);
3148 BFD_ASSERT ((offset
& ((1 << 2) - 1)) == 0);
3149 offset
= (signed int) offset
>> 2;
3150 BFD_ASSERT ((signed int) offset
>> 16 == -1);
3156 get_relocation_opnd (xtensa_opcode opcode
, int r_type
)
3158 xtensa_isa isa
= xtensa_default_isa
;
3159 int last_immed
, last_opnd
, opi
;
3161 if (opcode
== XTENSA_UNDEFINED
)
3162 return XTENSA_UNDEFINED
;
3164 /* Find the last visible PC-relative immediate operand for the opcode.
3165 If there are no PC-relative immediates, then choose the last visible
3166 immediate; otherwise, fail and return XTENSA_UNDEFINED. */
3167 last_immed
= XTENSA_UNDEFINED
;
3168 last_opnd
= xtensa_opcode_num_operands (isa
, opcode
);
3169 for (opi
= last_opnd
- 1; opi
>= 0; opi
--)
3171 if (xtensa_operand_is_visible (isa
, opcode
, opi
) == 0)
3173 if (xtensa_operand_is_PCrelative (isa
, opcode
, opi
) == 1)
3178 if (last_immed
== XTENSA_UNDEFINED
3179 && xtensa_operand_is_register (isa
, opcode
, opi
) == 0)
3183 return XTENSA_UNDEFINED
;
3185 /* If the operand number was specified in an old-style relocation,
3186 check for consistency with the operand computed above. */
3187 if (r_type
>= R_XTENSA_OP0
&& r_type
<= R_XTENSA_OP2
)
3189 int reloc_opnd
= r_type
- R_XTENSA_OP0
;
3190 if (reloc_opnd
!= last_immed
)
3191 return XTENSA_UNDEFINED
;
3199 get_relocation_slot (int r_type
)
3209 if (r_type
>= R_XTENSA_SLOT0_OP
&& r_type
<= R_XTENSA_SLOT14_OP
)
3210 return r_type
- R_XTENSA_SLOT0_OP
;
3211 if (r_type
>= R_XTENSA_SLOT0_ALT
&& r_type
<= R_XTENSA_SLOT14_ALT
)
3212 return r_type
- R_XTENSA_SLOT0_ALT
;
3216 return XTENSA_UNDEFINED
;
3220 /* Get the opcode for a relocation. */
3222 static xtensa_opcode
3223 get_relocation_opcode (bfd
*abfd
,
3226 Elf_Internal_Rela
*irel
)
3228 static xtensa_insnbuf ibuff
= NULL
;
3229 static xtensa_insnbuf sbuff
= NULL
;
3230 xtensa_isa isa
= xtensa_default_isa
;
3234 if (contents
== NULL
)
3235 return XTENSA_UNDEFINED
;
3237 if (bfd_get_section_limit (abfd
, sec
) <= irel
->r_offset
)
3238 return XTENSA_UNDEFINED
;
3242 ibuff
= xtensa_insnbuf_alloc (isa
);
3243 sbuff
= xtensa_insnbuf_alloc (isa
);
3246 /* Decode the instruction. */
3247 xtensa_insnbuf_from_chars (isa
, ibuff
, &contents
[irel
->r_offset
],
3248 sec
->size
- irel
->r_offset
);
3249 fmt
= xtensa_format_decode (isa
, ibuff
);
3250 slot
= get_relocation_slot (ELF32_R_TYPE (irel
->r_info
));
3251 if (slot
== XTENSA_UNDEFINED
)
3252 return XTENSA_UNDEFINED
;
3253 xtensa_format_get_slot (isa
, fmt
, slot
, ibuff
, sbuff
);
3254 return xtensa_opcode_decode (isa
, fmt
, slot
, sbuff
);
3259 is_l32r_relocation (bfd
*abfd
,
3262 Elf_Internal_Rela
*irel
)
3264 xtensa_opcode opcode
;
3265 if (!is_operand_relocation (ELF32_R_TYPE (irel
->r_info
)))
3267 opcode
= get_relocation_opcode (abfd
, sec
, contents
, irel
);
3268 return (opcode
== get_l32r_opcode ());
3272 static bfd_size_type
3273 get_asm_simplify_size (bfd_byte
*contents
,
3274 bfd_size_type content_len
,
3275 bfd_size_type offset
)
3277 bfd_size_type insnlen
, size
= 0;
3279 /* Decode the size of the next two instructions. */
3280 insnlen
= insn_decode_len (contents
, content_len
, offset
);
3286 insnlen
= insn_decode_len (contents
, content_len
, offset
+ size
);
3296 is_alt_relocation (int r_type
)
3298 return (r_type
>= R_XTENSA_SLOT0_ALT
3299 && r_type
<= R_XTENSA_SLOT14_ALT
);
3304 is_operand_relocation (int r_type
)
3314 if (r_type
>= R_XTENSA_SLOT0_OP
&& r_type
<= R_XTENSA_SLOT14_OP
)
3316 if (r_type
>= R_XTENSA_SLOT0_ALT
&& r_type
<= R_XTENSA_SLOT14_ALT
)
3325 #define MIN_INSN_LENGTH 2
3327 /* Return 0 if it fails to decode. */
3330 insn_decode_len (bfd_byte
*contents
,
3331 bfd_size_type content_len
,
3332 bfd_size_type offset
)
3335 xtensa_isa isa
= xtensa_default_isa
;
3337 static xtensa_insnbuf ibuff
= NULL
;
3339 if (offset
+ MIN_INSN_LENGTH
> content_len
)
3343 ibuff
= xtensa_insnbuf_alloc (isa
);
3344 xtensa_insnbuf_from_chars (isa
, ibuff
, &contents
[offset
],
3345 content_len
- offset
);
3346 fmt
= xtensa_format_decode (isa
, ibuff
);
3347 if (fmt
== XTENSA_UNDEFINED
)
3349 insn_len
= xtensa_format_length (isa
, fmt
);
3350 if (insn_len
== XTENSA_UNDEFINED
)
3356 /* Decode the opcode for a single slot instruction.
3357 Return 0 if it fails to decode or the instruction is multi-slot. */
3360 insn_decode_opcode (bfd_byte
*contents
,
3361 bfd_size_type content_len
,
3362 bfd_size_type offset
,
3365 xtensa_isa isa
= xtensa_default_isa
;
3367 static xtensa_insnbuf insnbuf
= NULL
;
3368 static xtensa_insnbuf slotbuf
= NULL
;
3370 if (offset
+ MIN_INSN_LENGTH
> content_len
)
3371 return XTENSA_UNDEFINED
;
3373 if (insnbuf
== NULL
)
3375 insnbuf
= xtensa_insnbuf_alloc (isa
);
3376 slotbuf
= xtensa_insnbuf_alloc (isa
);
3379 xtensa_insnbuf_from_chars (isa
, insnbuf
, &contents
[offset
],
3380 content_len
- offset
);
3381 fmt
= xtensa_format_decode (isa
, insnbuf
);
3382 if (fmt
== XTENSA_UNDEFINED
)
3383 return XTENSA_UNDEFINED
;
3385 if (slot
>= xtensa_format_num_slots (isa
, fmt
))
3386 return XTENSA_UNDEFINED
;
3388 xtensa_format_get_slot (isa
, fmt
, slot
, insnbuf
, slotbuf
);
3389 return xtensa_opcode_decode (isa
, fmt
, slot
, slotbuf
);
3393 /* The offset is the offset in the contents.
3394 The address is the address of that offset. */
3397 check_branch_target_aligned (bfd_byte
*contents
,
3398 bfd_size_type content_length
,
3402 bfd_size_type insn_len
= insn_decode_len (contents
, content_length
, offset
);
3405 return check_branch_target_aligned_address (address
, insn_len
);
3410 check_loop_aligned (bfd_byte
*contents
,
3411 bfd_size_type content_length
,
3415 bfd_size_type loop_len
, insn_len
;
3416 xtensa_opcode opcode
;
3418 opcode
= insn_decode_opcode (contents
, content_length
, offset
, 0);
3419 if (opcode
== XTENSA_UNDEFINED
3420 || xtensa_opcode_is_loop (xtensa_default_isa
, opcode
) != 1)
3426 loop_len
= insn_decode_len (contents
, content_length
, offset
);
3427 insn_len
= insn_decode_len (contents
, content_length
, offset
+ loop_len
);
3428 if (loop_len
== 0 || insn_len
== 0)
3434 return check_branch_target_aligned_address (address
+ loop_len
, insn_len
);
3439 check_branch_target_aligned_address (bfd_vma addr
, int len
)
3442 return (addr
% 8 == 0);
3443 return ((addr
>> 2) == ((addr
+ len
- 1) >> 2));
3447 /* Instruction widening and narrowing. */
3449 /* When FLIX is available we need to access certain instructions only
3450 when they are 16-bit or 24-bit instructions. This table caches
3451 information about such instructions by walking through all the
3452 opcodes and finding the smallest single-slot format into which each
3455 static xtensa_format
*op_single_fmt_table
= NULL
;
3459 init_op_single_format_table (void)
3461 xtensa_isa isa
= xtensa_default_isa
;
3462 xtensa_insnbuf ibuf
;
3463 xtensa_opcode opcode
;
3467 if (op_single_fmt_table
)
3470 ibuf
= xtensa_insnbuf_alloc (isa
);
3471 num_opcodes
= xtensa_isa_num_opcodes (isa
);
3473 op_single_fmt_table
= (xtensa_format
*)
3474 bfd_malloc (sizeof (xtensa_format
) * num_opcodes
);
3475 for (opcode
= 0; opcode
< num_opcodes
; opcode
++)
3477 op_single_fmt_table
[opcode
] = XTENSA_UNDEFINED
;
3478 for (fmt
= 0; fmt
< xtensa_isa_num_formats (isa
); fmt
++)
3480 if (xtensa_format_num_slots (isa
, fmt
) == 1
3481 && xtensa_opcode_encode (isa
, fmt
, 0, ibuf
, opcode
) == 0)
3483 xtensa_opcode old_fmt
= op_single_fmt_table
[opcode
];
3484 int fmt_length
= xtensa_format_length (isa
, fmt
);
3485 if (old_fmt
== XTENSA_UNDEFINED
3486 || fmt_length
< xtensa_format_length (isa
, old_fmt
))
3487 op_single_fmt_table
[opcode
] = fmt
;
3491 xtensa_insnbuf_free (isa
, ibuf
);
3495 static xtensa_format
3496 get_single_format (xtensa_opcode opcode
)
3498 init_op_single_format_table ();
3499 return op_single_fmt_table
[opcode
];
3503 /* For the set of narrowable instructions we do NOT include the
3504 narrowings beqz -> beqz.n or bnez -> bnez.n because of complexities
3505 involved during linker relaxation that may require these to
3506 re-expand in some conditions. Also, the narrowing "or" -> mov.n
3507 requires special case code to ensure it only works when op1 == op2. */
3515 struct string_pair narrowable
[] =
3518 { "addi", "addi.n" },
3519 { "addmi", "addi.n" },
3520 { "l32i", "l32i.n" },
3521 { "movi", "movi.n" },
3523 { "retw", "retw.n" },
3524 { "s32i", "s32i.n" },
3525 { "or", "mov.n" } /* special case only when op1 == op2 */
3528 struct string_pair widenable
[] =
3531 { "addi", "addi.n" },
3532 { "addmi", "addi.n" },
3533 { "beqz", "beqz.n" },
3534 { "bnez", "bnez.n" },
3535 { "l32i", "l32i.n" },
3536 { "movi", "movi.n" },
3538 { "retw", "retw.n" },
3539 { "s32i", "s32i.n" },
3540 { "or", "mov.n" } /* special case only when op1 == op2 */
3544 /* Check if an instruction can be "narrowed", i.e., changed from a standard
3545 3-byte instruction to a 2-byte "density" instruction. If it is valid,
3546 return the instruction buffer holding the narrow instruction. Otherwise,
3547 return 0. The set of valid narrowing are specified by a string table
3548 but require some special case operand checks in some cases. */
3550 static xtensa_insnbuf
3551 can_narrow_instruction (xtensa_insnbuf slotbuf
,
3553 xtensa_opcode opcode
)
3555 xtensa_isa isa
= xtensa_default_isa
;
3556 xtensa_format o_fmt
;
3559 static xtensa_insnbuf o_insnbuf
= NULL
;
3560 static xtensa_insnbuf o_slotbuf
= NULL
;
3562 if (o_insnbuf
== NULL
)
3564 o_insnbuf
= xtensa_insnbuf_alloc (isa
);
3565 o_slotbuf
= xtensa_insnbuf_alloc (isa
);
3568 for (opi
= 0; opi
< (sizeof (narrowable
)/sizeof (struct string_pair
)); opi
++)
3570 bfd_boolean is_or
= (strcmp ("or", narrowable
[opi
].wide
) == 0);
3572 if (opcode
== xtensa_opcode_lookup (isa
, narrowable
[opi
].wide
))
3574 uint32 value
, newval
;
3575 int i
, operand_count
, o_operand_count
;
3576 xtensa_opcode o_opcode
;
3578 /* Address does not matter in this case. We might need to
3579 fix it to handle branches/jumps. */
3580 bfd_vma self_address
= 0;
3582 o_opcode
= xtensa_opcode_lookup (isa
, narrowable
[opi
].narrow
);
3583 if (o_opcode
== XTENSA_UNDEFINED
)
3585 o_fmt
= get_single_format (o_opcode
);
3586 if (o_fmt
== XTENSA_UNDEFINED
)
3589 if (xtensa_format_length (isa
, fmt
) != 3
3590 || xtensa_format_length (isa
, o_fmt
) != 2)
3593 xtensa_format_encode (isa
, o_fmt
, o_insnbuf
);
3594 operand_count
= xtensa_opcode_num_operands (isa
, opcode
);
3595 o_operand_count
= xtensa_opcode_num_operands (isa
, o_opcode
);
3597 if (xtensa_opcode_encode (isa
, o_fmt
, 0, o_slotbuf
, o_opcode
) != 0)
3602 if (xtensa_opcode_num_operands (isa
, o_opcode
) != operand_count
)
3607 uint32 rawval0
, rawval1
, rawval2
;
3609 if (o_operand_count
+ 1 != operand_count
3610 || xtensa_operand_get_field (isa
, opcode
, 0,
3611 fmt
, 0, slotbuf
, &rawval0
) != 0
3612 || xtensa_operand_get_field (isa
, opcode
, 1,
3613 fmt
, 0, slotbuf
, &rawval1
) != 0
3614 || xtensa_operand_get_field (isa
, opcode
, 2,
3615 fmt
, 0, slotbuf
, &rawval2
) != 0
3616 || rawval1
!= rawval2
3617 || rawval0
== rawval1
/* it is a nop */)
3621 for (i
= 0; i
< o_operand_count
; ++i
)
3623 if (xtensa_operand_get_field (isa
, opcode
, i
, fmt
, 0,
3625 || xtensa_operand_decode (isa
, opcode
, i
, &value
))
3628 /* PC-relative branches need adjustment, but
3629 the PC-rel operand will always have a relocation. */
3631 if (xtensa_operand_do_reloc (isa
, o_opcode
, i
, &newval
,
3633 || xtensa_operand_encode (isa
, o_opcode
, i
, &newval
)
3634 || xtensa_operand_set_field (isa
, o_opcode
, i
, o_fmt
, 0,
3639 if (xtensa_format_set_slot (isa
, o_fmt
, 0, o_insnbuf
, o_slotbuf
))
3649 /* Attempt to narrow an instruction. If the narrowing is valid, perform
3650 the action in-place directly into the contents and return TRUE. Otherwise,
3651 the return value is FALSE and the contents are not modified. */
3654 narrow_instruction (bfd_byte
*contents
,
3655 bfd_size_type content_length
,
3656 bfd_size_type offset
)
3658 xtensa_opcode opcode
;
3659 bfd_size_type insn_len
;
3660 xtensa_isa isa
= xtensa_default_isa
;
3662 xtensa_insnbuf o_insnbuf
;
3664 static xtensa_insnbuf insnbuf
= NULL
;
3665 static xtensa_insnbuf slotbuf
= NULL
;
3667 if (insnbuf
== NULL
)
3669 insnbuf
= xtensa_insnbuf_alloc (isa
);
3670 slotbuf
= xtensa_insnbuf_alloc (isa
);
3673 BFD_ASSERT (offset
< content_length
);
3675 if (content_length
< 2)
3678 /* We will hand-code a few of these for a little while.
3679 These have all been specified in the assembler aleady. */
3680 xtensa_insnbuf_from_chars (isa
, insnbuf
, &contents
[offset
],
3681 content_length
- offset
);
3682 fmt
= xtensa_format_decode (isa
, insnbuf
);
3683 if (xtensa_format_num_slots (isa
, fmt
) != 1)
3686 if (xtensa_format_get_slot (isa
, fmt
, 0, insnbuf
, slotbuf
) != 0)
3689 opcode
= xtensa_opcode_decode (isa
, fmt
, 0, slotbuf
);
3690 if (opcode
== XTENSA_UNDEFINED
)
3692 insn_len
= xtensa_format_length (isa
, fmt
);
3693 if (insn_len
> content_length
)
3696 o_insnbuf
= can_narrow_instruction (slotbuf
, fmt
, opcode
);
3699 xtensa_insnbuf_to_chars (isa
, o_insnbuf
, contents
+ offset
,
3700 content_length
- offset
);
3708 /* Check if an instruction can be "widened", i.e., changed from a 2-byte
3709 "density" instruction to a standard 3-byte instruction. If it is valid,
3710 return the instruction buffer holding the wide instruction. Otherwise,
3711 return 0. The set of valid widenings are specified by a string table
3712 but require some special case operand checks in some cases. */
3714 static xtensa_insnbuf
3715 can_widen_instruction (xtensa_insnbuf slotbuf
,
3717 xtensa_opcode opcode
)
3719 xtensa_isa isa
= xtensa_default_isa
;
3720 xtensa_format o_fmt
;
3723 static xtensa_insnbuf o_insnbuf
= NULL
;
3724 static xtensa_insnbuf o_slotbuf
= NULL
;
3726 if (o_insnbuf
== NULL
)
3728 o_insnbuf
= xtensa_insnbuf_alloc (isa
);
3729 o_slotbuf
= xtensa_insnbuf_alloc (isa
);
3732 for (opi
= 0; opi
< (sizeof (widenable
)/sizeof (struct string_pair
)); opi
++)
3734 bfd_boolean is_or
= (strcmp ("or", widenable
[opi
].wide
) == 0);
3735 bfd_boolean is_branch
= (strcmp ("beqz", widenable
[opi
].wide
) == 0
3736 || strcmp ("bnez", widenable
[opi
].wide
) == 0);
3738 if (opcode
== xtensa_opcode_lookup (isa
, widenable
[opi
].narrow
))
3740 uint32 value
, newval
;
3741 int i
, operand_count
, o_operand_count
, check_operand_count
;
3742 xtensa_opcode o_opcode
;
3744 /* Address does not matter in this case. We might need to fix it
3745 to handle branches/jumps. */
3746 bfd_vma self_address
= 0;
3748 o_opcode
= xtensa_opcode_lookup (isa
, widenable
[opi
].wide
);
3749 if (o_opcode
== XTENSA_UNDEFINED
)
3751 o_fmt
= get_single_format (o_opcode
);
3752 if (o_fmt
== XTENSA_UNDEFINED
)
3755 if (xtensa_format_length (isa
, fmt
) != 2
3756 || xtensa_format_length (isa
, o_fmt
) != 3)
3759 xtensa_format_encode (isa
, o_fmt
, o_insnbuf
);
3760 operand_count
= xtensa_opcode_num_operands (isa
, opcode
);
3761 o_operand_count
= xtensa_opcode_num_operands (isa
, o_opcode
);
3762 check_operand_count
= o_operand_count
;
3764 if (xtensa_opcode_encode (isa
, o_fmt
, 0, o_slotbuf
, o_opcode
) != 0)
3769 if (xtensa_opcode_num_operands (isa
, o_opcode
) != operand_count
)
3774 uint32 rawval0
, rawval1
;
3776 if (o_operand_count
!= operand_count
+ 1
3777 || xtensa_operand_get_field (isa
, opcode
, 0,
3778 fmt
, 0, slotbuf
, &rawval0
) != 0
3779 || xtensa_operand_get_field (isa
, opcode
, 1,
3780 fmt
, 0, slotbuf
, &rawval1
) != 0
3781 || rawval0
== rawval1
/* it is a nop */)
3785 check_operand_count
--;
3787 for (i
= 0; i
< check_operand_count
; i
++)
3790 if (is_or
&& i
== o_operand_count
- 1)
3792 if (xtensa_operand_get_field (isa
, opcode
, new_i
, fmt
, 0,
3794 || xtensa_operand_decode (isa
, opcode
, new_i
, &value
))
3797 /* PC-relative branches need adjustment, but
3798 the PC-rel operand will always have a relocation. */
3800 if (xtensa_operand_do_reloc (isa
, o_opcode
, i
, &newval
,
3802 || xtensa_operand_encode (isa
, o_opcode
, i
, &newval
)
3803 || xtensa_operand_set_field (isa
, o_opcode
, i
, o_fmt
, 0,
3808 if (xtensa_format_set_slot (isa
, o_fmt
, 0, o_insnbuf
, o_slotbuf
))
3818 /* Attempt to widen an instruction. If the widening is valid, perform
3819 the action in-place directly into the contents and return TRUE. Otherwise,
3820 the return value is FALSE and the contents are not modified. */
3823 widen_instruction (bfd_byte
*contents
,
3824 bfd_size_type content_length
,
3825 bfd_size_type offset
)
3827 xtensa_opcode opcode
;
3828 bfd_size_type insn_len
;
3829 xtensa_isa isa
= xtensa_default_isa
;
3831 xtensa_insnbuf o_insnbuf
;
3833 static xtensa_insnbuf insnbuf
= NULL
;
3834 static xtensa_insnbuf slotbuf
= NULL
;
3836 if (insnbuf
== NULL
)
3838 insnbuf
= xtensa_insnbuf_alloc (isa
);
3839 slotbuf
= xtensa_insnbuf_alloc (isa
);
3842 BFD_ASSERT (offset
< content_length
);
3844 if (content_length
< 2)
3847 /* We will hand-code a few of these for a little while.
3848 These have all been specified in the assembler aleady. */
3849 xtensa_insnbuf_from_chars (isa
, insnbuf
, &contents
[offset
],
3850 content_length
- offset
);
3851 fmt
= xtensa_format_decode (isa
, insnbuf
);
3852 if (xtensa_format_num_slots (isa
, fmt
) != 1)
3855 if (xtensa_format_get_slot (isa
, fmt
, 0, insnbuf
, slotbuf
) != 0)
3858 opcode
= xtensa_opcode_decode (isa
, fmt
, 0, slotbuf
);
3859 if (opcode
== XTENSA_UNDEFINED
)
3861 insn_len
= xtensa_format_length (isa
, fmt
);
3862 if (insn_len
> content_length
)
3865 o_insnbuf
= can_widen_instruction (slotbuf
, fmt
, opcode
);
3868 xtensa_insnbuf_to_chars (isa
, o_insnbuf
, contents
+ offset
,
3869 content_length
- offset
);
3876 /* Code for transforming CALLs at link-time. */
3878 static bfd_reloc_status_type
3879 elf_xtensa_do_asm_simplify (bfd_byte
*contents
,
3881 bfd_vma content_length
,
3882 char **error_message
)
3884 static xtensa_insnbuf insnbuf
= NULL
;
3885 static xtensa_insnbuf slotbuf
= NULL
;
3886 xtensa_format core_format
= XTENSA_UNDEFINED
;
3887 xtensa_opcode opcode
;
3888 xtensa_opcode direct_call_opcode
;
3889 xtensa_isa isa
= xtensa_default_isa
;
3890 bfd_byte
*chbuf
= contents
+ address
;
3893 if (insnbuf
== NULL
)
3895 insnbuf
= xtensa_insnbuf_alloc (isa
);
3896 slotbuf
= xtensa_insnbuf_alloc (isa
);
3899 if (content_length
< address
)
3901 *error_message
= _("Attempt to convert L32R/CALLX to CALL failed");
3902 return bfd_reloc_other
;
3905 opcode
= get_expanded_call_opcode (chbuf
, content_length
- address
, 0);
3906 direct_call_opcode
= swap_callx_for_call_opcode (opcode
);
3907 if (direct_call_opcode
== XTENSA_UNDEFINED
)
3909 *error_message
= _("Attempt to convert L32R/CALLX to CALL failed");
3910 return bfd_reloc_other
;
3913 /* Assemble a NOP ("or a1, a1, a1") into the 0 byte offset. */
3914 core_format
= xtensa_format_lookup (isa
, "x24");
3915 opcode
= xtensa_opcode_lookup (isa
, "or");
3916 xtensa_opcode_encode (isa
, core_format
, 0, slotbuf
, opcode
);
3917 for (opn
= 0; opn
< 3; opn
++)
3920 xtensa_operand_encode (isa
, opcode
, opn
, ®no
);
3921 xtensa_operand_set_field (isa
, opcode
, opn
, core_format
, 0,
3924 xtensa_format_encode (isa
, core_format
, insnbuf
);
3925 xtensa_format_set_slot (isa
, core_format
, 0, insnbuf
, slotbuf
);
3926 xtensa_insnbuf_to_chars (isa
, insnbuf
, chbuf
, content_length
- address
);
3928 /* Assemble a CALL ("callN 0") into the 3 byte offset. */
3929 xtensa_opcode_encode (isa
, core_format
, 0, slotbuf
, direct_call_opcode
);
3930 xtensa_operand_set_field (isa
, opcode
, 0, core_format
, 0, slotbuf
, 0);
3932 xtensa_format_encode (isa
, core_format
, insnbuf
);
3933 xtensa_format_set_slot (isa
, core_format
, 0, insnbuf
, slotbuf
);
3934 xtensa_insnbuf_to_chars (isa
, insnbuf
, chbuf
+ 3,
3935 content_length
- address
- 3);
3937 return bfd_reloc_ok
;
3941 static bfd_reloc_status_type
3942 contract_asm_expansion (bfd_byte
*contents
,
3943 bfd_vma content_length
,
3944 Elf_Internal_Rela
*irel
,
3945 char **error_message
)
3947 bfd_reloc_status_type retval
=
3948 elf_xtensa_do_asm_simplify (contents
, irel
->r_offset
, content_length
,
3951 if (retval
!= bfd_reloc_ok
)
3952 return bfd_reloc_dangerous
;
3954 /* Update the irel->r_offset field so that the right immediate and
3955 the right instruction are modified during the relocation. */
3956 irel
->r_offset
+= 3;
3957 irel
->r_info
= ELF32_R_INFO (ELF32_R_SYM (irel
->r_info
), R_XTENSA_SLOT0_OP
);
3958 return bfd_reloc_ok
;
3962 static xtensa_opcode
3963 swap_callx_for_call_opcode (xtensa_opcode opcode
)
3965 init_call_opcodes ();
3967 if (opcode
== callx0_op
) return call0_op
;
3968 if (opcode
== callx4_op
) return call4_op
;
3969 if (opcode
== callx8_op
) return call8_op
;
3970 if (opcode
== callx12_op
) return call12_op
;
3972 /* Return XTENSA_UNDEFINED if the opcode is not an indirect call. */
3973 return XTENSA_UNDEFINED
;
3977 /* Check if "buf" is pointing to a "L32R aN; CALLX aN" or "CONST16 aN;
3978 CONST16 aN; CALLX aN" sequence, and if so, return the CALLX opcode.
3979 If not, return XTENSA_UNDEFINED. */
3981 #define L32R_TARGET_REG_OPERAND 0
3982 #define CONST16_TARGET_REG_OPERAND 0
3983 #define CALLN_SOURCE_OPERAND 0
3985 static xtensa_opcode
3986 get_expanded_call_opcode (bfd_byte
*buf
, int bufsize
, bfd_boolean
*p_uses_l32r
)
3988 static xtensa_insnbuf insnbuf
= NULL
;
3989 static xtensa_insnbuf slotbuf
= NULL
;
3991 xtensa_opcode opcode
;
3992 xtensa_isa isa
= xtensa_default_isa
;
3993 uint32 regno
, const16_regno
, call_regno
;
3996 if (insnbuf
== NULL
)
3998 insnbuf
= xtensa_insnbuf_alloc (isa
);
3999 slotbuf
= xtensa_insnbuf_alloc (isa
);
4002 xtensa_insnbuf_from_chars (isa
, insnbuf
, buf
, bufsize
);
4003 fmt
= xtensa_format_decode (isa
, insnbuf
);
4004 if (fmt
== XTENSA_UNDEFINED
4005 || xtensa_format_get_slot (isa
, fmt
, 0, insnbuf
, slotbuf
))
4006 return XTENSA_UNDEFINED
;
4008 opcode
= xtensa_opcode_decode (isa
, fmt
, 0, slotbuf
);
4009 if (opcode
== XTENSA_UNDEFINED
)
4010 return XTENSA_UNDEFINED
;
4012 if (opcode
== get_l32r_opcode ())
4015 *p_uses_l32r
= TRUE
;
4016 if (xtensa_operand_get_field (isa
, opcode
, L32R_TARGET_REG_OPERAND
,
4017 fmt
, 0, slotbuf
, ®no
)
4018 || xtensa_operand_decode (isa
, opcode
, L32R_TARGET_REG_OPERAND
,
4020 return XTENSA_UNDEFINED
;
4022 else if (opcode
== get_const16_opcode ())
4025 *p_uses_l32r
= FALSE
;
4026 if (xtensa_operand_get_field (isa
, opcode
, CONST16_TARGET_REG_OPERAND
,
4027 fmt
, 0, slotbuf
, ®no
)
4028 || xtensa_operand_decode (isa
, opcode
, CONST16_TARGET_REG_OPERAND
,
4030 return XTENSA_UNDEFINED
;
4032 /* Check that the next instruction is also CONST16. */
4033 offset
+= xtensa_format_length (isa
, fmt
);
4034 xtensa_insnbuf_from_chars (isa
, insnbuf
, buf
+ offset
, bufsize
- offset
);
4035 fmt
= xtensa_format_decode (isa
, insnbuf
);
4036 if (fmt
== XTENSA_UNDEFINED
4037 || xtensa_format_get_slot (isa
, fmt
, 0, insnbuf
, slotbuf
))
4038 return XTENSA_UNDEFINED
;
4039 opcode
= xtensa_opcode_decode (isa
, fmt
, 0, slotbuf
);
4040 if (opcode
!= get_const16_opcode ())
4041 return XTENSA_UNDEFINED
;
4043 if (xtensa_operand_get_field (isa
, opcode
, CONST16_TARGET_REG_OPERAND
,
4044 fmt
, 0, slotbuf
, &const16_regno
)
4045 || xtensa_operand_decode (isa
, opcode
, CONST16_TARGET_REG_OPERAND
,
4047 || const16_regno
!= regno
)
4048 return XTENSA_UNDEFINED
;
4051 return XTENSA_UNDEFINED
;
4053 /* Next instruction should be an CALLXn with operand 0 == regno. */
4054 offset
+= xtensa_format_length (isa
, fmt
);
4055 xtensa_insnbuf_from_chars (isa
, insnbuf
, buf
+ offset
, bufsize
- offset
);
4056 fmt
= xtensa_format_decode (isa
, insnbuf
);
4057 if (fmt
== XTENSA_UNDEFINED
4058 || xtensa_format_get_slot (isa
, fmt
, 0, insnbuf
, slotbuf
))
4059 return XTENSA_UNDEFINED
;
4060 opcode
= xtensa_opcode_decode (isa
, fmt
, 0, slotbuf
);
4061 if (opcode
== XTENSA_UNDEFINED
4062 || !is_indirect_call_opcode (opcode
))
4063 return XTENSA_UNDEFINED
;
4065 if (xtensa_operand_get_field (isa
, opcode
, CALLN_SOURCE_OPERAND
,
4066 fmt
, 0, slotbuf
, &call_regno
)
4067 || xtensa_operand_decode (isa
, opcode
, CALLN_SOURCE_OPERAND
,
4069 return XTENSA_UNDEFINED
;
4071 if (call_regno
!= regno
)
4072 return XTENSA_UNDEFINED
;
4078 /* Data structures used during relaxation. */
4080 /* r_reloc: relocation values. */
4082 /* Through the relaxation process, we need to keep track of the values
4083 that will result from evaluating relocations. The standard ELF
4084 relocation structure is not sufficient for this purpose because we're
4085 operating on multiple input files at once, so we need to know which
4086 input file a relocation refers to. The r_reloc structure thus
4087 records both the input file (bfd) and ELF relocation.
4089 For efficiency, an r_reloc also contains a "target_offset" field to
4090 cache the target-section-relative offset value that is represented by
4093 The r_reloc also contains a virtual offset that allows multiple
4094 inserted literals to be placed at the same "address" with
4095 different offsets. */
4097 typedef struct r_reloc_struct r_reloc
;
4099 struct r_reloc_struct
4102 Elf_Internal_Rela rela
;
4103 bfd_vma target_offset
;
4104 bfd_vma virtual_offset
;
4108 /* The r_reloc structure is included by value in literal_value, but not
4109 every literal_value has an associated relocation -- some are simple
4110 constants. In such cases, we set all the fields in the r_reloc
4111 struct to zero. The r_reloc_is_const function should be used to
4112 detect this case. */
4115 r_reloc_is_const (const r_reloc
*r_rel
)
4117 return (r_rel
->abfd
== NULL
);
4122 r_reloc_get_target_offset (const r_reloc
*r_rel
)
4124 bfd_vma target_offset
;
4125 unsigned long r_symndx
;
4127 BFD_ASSERT (!r_reloc_is_const (r_rel
));
4128 r_symndx
= ELF32_R_SYM (r_rel
->rela
.r_info
);
4129 target_offset
= get_elf_r_symndx_offset (r_rel
->abfd
, r_symndx
);
4130 return (target_offset
+ r_rel
->rela
.r_addend
);
4134 static struct elf_link_hash_entry
*
4135 r_reloc_get_hash_entry (const r_reloc
*r_rel
)
4137 unsigned long r_symndx
= ELF32_R_SYM (r_rel
->rela
.r_info
);
4138 return get_elf_r_symndx_hash_entry (r_rel
->abfd
, r_symndx
);
4143 r_reloc_get_section (const r_reloc
*r_rel
)
4145 unsigned long r_symndx
= ELF32_R_SYM (r_rel
->rela
.r_info
);
4146 return get_elf_r_symndx_section (r_rel
->abfd
, r_symndx
);
4151 r_reloc_is_defined (const r_reloc
*r_rel
)
4157 sec
= r_reloc_get_section (r_rel
);
4158 if (sec
== bfd_abs_section_ptr
4159 || sec
== bfd_com_section_ptr
4160 || sec
== bfd_und_section_ptr
)
4167 r_reloc_init (r_reloc
*r_rel
,
4169 Elf_Internal_Rela
*irel
,
4171 bfd_size_type content_length
)
4174 reloc_howto_type
*howto
;
4178 r_rel
->rela
= *irel
;
4180 r_rel
->target_offset
= r_reloc_get_target_offset (r_rel
);
4181 r_rel
->virtual_offset
= 0;
4182 r_type
= ELF32_R_TYPE (r_rel
->rela
.r_info
);
4183 howto
= &elf_howto_table
[r_type
];
4184 if (howto
->partial_inplace
)
4186 bfd_vma inplace_val
;
4187 BFD_ASSERT (r_rel
->rela
.r_offset
< content_length
);
4189 inplace_val
= bfd_get_32 (abfd
, &contents
[r_rel
->rela
.r_offset
]);
4190 r_rel
->target_offset
+= inplace_val
;
4194 memset (r_rel
, 0, sizeof (r_reloc
));
4201 print_r_reloc (FILE *fp
, const r_reloc
*r_rel
)
4203 if (r_reloc_is_defined (r_rel
))
4205 asection
*sec
= r_reloc_get_section (r_rel
);
4206 fprintf (fp
, " %s(%s + ", sec
->owner
->filename
, sec
->name
);
4208 else if (r_reloc_get_hash_entry (r_rel
))
4209 fprintf (fp
, " %s + ", r_reloc_get_hash_entry (r_rel
)->root
.root
.string
);
4211 fprintf (fp
, " ?? + ");
4213 fprintf_vma (fp
, r_rel
->target_offset
);
4214 if (r_rel
->virtual_offset
)
4216 fprintf (fp
, " + ");
4217 fprintf_vma (fp
, r_rel
->virtual_offset
);
4226 /* source_reloc: relocations that reference literals. */
4228 /* To determine whether literals can be coalesced, we need to first
4229 record all the relocations that reference the literals. The
4230 source_reloc structure below is used for this purpose. The
4231 source_reloc entries are kept in a per-literal-section array, sorted
4232 by offset within the literal section (i.e., target offset).
4234 The source_sec and r_rel.rela.r_offset fields identify the source of
4235 the relocation. The r_rel field records the relocation value, i.e.,
4236 the offset of the literal being referenced. The opnd field is needed
4237 to determine the range of the immediate field to which the relocation
4238 applies, so we can determine whether another literal with the same
4239 value is within range. The is_null field is true when the relocation
4240 is being removed (e.g., when an L32R is being removed due to a CALLX
4241 that is converted to a direct CALL). */
4243 typedef struct source_reloc_struct source_reloc
;
4245 struct source_reloc_struct
4247 asection
*source_sec
;
4249 xtensa_opcode opcode
;
4251 bfd_boolean is_null
;
4252 bfd_boolean is_abs_literal
;
4257 init_source_reloc (source_reloc
*reloc
,
4258 asection
*source_sec
,
4259 const r_reloc
*r_rel
,
4260 xtensa_opcode opcode
,
4262 bfd_boolean is_abs_literal
)
4264 reloc
->source_sec
= source_sec
;
4265 reloc
->r_rel
= *r_rel
;
4266 reloc
->opcode
= opcode
;
4268 reloc
->is_null
= FALSE
;
4269 reloc
->is_abs_literal
= is_abs_literal
;
4273 /* Find the source_reloc for a particular source offset and relocation
4274 type. Note that the array is sorted by _target_ offset, so this is
4275 just a linear search. */
4277 static source_reloc
*
4278 find_source_reloc (source_reloc
*src_relocs
,
4281 Elf_Internal_Rela
*irel
)
4285 for (i
= 0; i
< src_count
; i
++)
4287 if (src_relocs
[i
].source_sec
== sec
4288 && src_relocs
[i
].r_rel
.rela
.r_offset
== irel
->r_offset
4289 && (ELF32_R_TYPE (src_relocs
[i
].r_rel
.rela
.r_info
)
4290 == ELF32_R_TYPE (irel
->r_info
)))
4291 return &src_relocs
[i
];
4299 source_reloc_compare (const void *ap
, const void *bp
)
4301 const source_reloc
*a
= (const source_reloc
*) ap
;
4302 const source_reloc
*b
= (const source_reloc
*) bp
;
4304 if (a
->r_rel
.target_offset
!= b
->r_rel
.target_offset
)
4305 return (a
->r_rel
.target_offset
- b
->r_rel
.target_offset
);
4307 /* We don't need to sort on these criteria for correctness,
4308 but enforcing a more strict ordering prevents unstable qsort
4309 from behaving differently with different implementations.
4310 Without the code below we get correct but different results
4311 on Solaris 2.7 and 2.8. We would like to always produce the
4312 same results no matter the host. */
4314 if ((!a
->is_null
) - (!b
->is_null
))
4315 return ((!a
->is_null
) - (!b
->is_null
));
4316 return internal_reloc_compare (&a
->r_rel
.rela
, &b
->r_rel
.rela
);
4320 /* Literal values and value hash tables. */
4322 /* Literals with the same value can be coalesced. The literal_value
4323 structure records the value of a literal: the "r_rel" field holds the
4324 information from the relocation on the literal (if there is one) and
4325 the "value" field holds the contents of the literal word itself.
4327 The value_map structure records a literal value along with the
4328 location of a literal holding that value. The value_map hash table
4329 is indexed by the literal value, so that we can quickly check if a
4330 particular literal value has been seen before and is thus a candidate
4333 typedef struct literal_value_struct literal_value
;
4334 typedef struct value_map_struct value_map
;
4335 typedef struct value_map_hash_table_struct value_map_hash_table
;
4337 struct literal_value_struct
4340 unsigned long value
;
4341 bfd_boolean is_abs_literal
;
4344 struct value_map_struct
4346 literal_value val
; /* The literal value. */
4347 r_reloc loc
; /* Location of the literal. */
4351 struct value_map_hash_table_struct
4353 unsigned bucket_count
;
4354 value_map
**buckets
;
4356 bfd_boolean has_last_loc
;
4362 init_literal_value (literal_value
*lit
,
4363 const r_reloc
*r_rel
,
4364 unsigned long value
,
4365 bfd_boolean is_abs_literal
)
4367 lit
->r_rel
= *r_rel
;
4369 lit
->is_abs_literal
= is_abs_literal
;
4374 literal_value_equal (const literal_value
*src1
,
4375 const literal_value
*src2
,
4376 bfd_boolean final_static_link
)
4378 struct elf_link_hash_entry
*h1
, *h2
;
4380 if (r_reloc_is_const (&src1
->r_rel
) != r_reloc_is_const (&src2
->r_rel
))
4383 if (r_reloc_is_const (&src1
->r_rel
))
4384 return (src1
->value
== src2
->value
);
4386 if (ELF32_R_TYPE (src1
->r_rel
.rela
.r_info
)
4387 != ELF32_R_TYPE (src2
->r_rel
.rela
.r_info
))
4390 if (src1
->r_rel
.target_offset
!= src2
->r_rel
.target_offset
)
4393 if (src1
->r_rel
.virtual_offset
!= src2
->r_rel
.virtual_offset
)
4396 if (src1
->value
!= src2
->value
)
4399 /* Now check for the same section (if defined) or the same elf_hash
4400 (if undefined or weak). */
4401 h1
= r_reloc_get_hash_entry (&src1
->r_rel
);
4402 h2
= r_reloc_get_hash_entry (&src2
->r_rel
);
4403 if (r_reloc_is_defined (&src1
->r_rel
)
4404 && (final_static_link
4405 || ((!h1
|| h1
->root
.type
!= bfd_link_hash_defweak
)
4406 && (!h2
|| h2
->root
.type
!= bfd_link_hash_defweak
))))
4408 if (r_reloc_get_section (&src1
->r_rel
)
4409 != r_reloc_get_section (&src2
->r_rel
))
4414 /* Require that the hash entries (i.e., symbols) be identical. */
4415 if (h1
!= h2
|| h1
== 0)
4419 if (src1
->is_abs_literal
!= src2
->is_abs_literal
)
4426 /* Must be power of 2. */
4427 #define INITIAL_HASH_RELOC_BUCKET_COUNT 1024
4429 static value_map_hash_table
*
4430 value_map_hash_table_init (void)
4432 value_map_hash_table
*values
;
4434 values
= (value_map_hash_table
*)
4435 bfd_zmalloc (sizeof (value_map_hash_table
));
4436 values
->bucket_count
= INITIAL_HASH_RELOC_BUCKET_COUNT
;
4438 values
->buckets
= (value_map
**)
4439 bfd_zmalloc (sizeof (value_map
*) * values
->bucket_count
);
4440 if (values
->buckets
== NULL
)
4445 values
->has_last_loc
= FALSE
;
4452 value_map_hash_table_delete (value_map_hash_table
*table
)
4454 free (table
->buckets
);
4460 hash_bfd_vma (bfd_vma val
)
4462 return (val
>> 2) + (val
>> 10);
4467 literal_value_hash (const literal_value
*src
)
4471 hash_val
= hash_bfd_vma (src
->value
);
4472 if (!r_reloc_is_const (&src
->r_rel
))
4476 hash_val
+= hash_bfd_vma (src
->is_abs_literal
* 1000);
4477 hash_val
+= hash_bfd_vma (src
->r_rel
.target_offset
);
4478 hash_val
+= hash_bfd_vma (src
->r_rel
.virtual_offset
);
4480 /* Now check for the same section and the same elf_hash. */
4481 if (r_reloc_is_defined (&src
->r_rel
))
4482 sec_or_hash
= r_reloc_get_section (&src
->r_rel
);
4484 sec_or_hash
= r_reloc_get_hash_entry (&src
->r_rel
);
4485 hash_val
+= hash_bfd_vma ((bfd_vma
) (size_t) sec_or_hash
);
4491 /* Check if the specified literal_value has been seen before. */
4494 value_map_get_cached_value (value_map_hash_table
*map
,
4495 const literal_value
*val
,
4496 bfd_boolean final_static_link
)
4502 idx
= literal_value_hash (val
);
4503 idx
= idx
& (map
->bucket_count
- 1);
4504 bucket
= map
->buckets
[idx
];
4505 for (map_e
= bucket
; map_e
; map_e
= map_e
->next
)
4507 if (literal_value_equal (&map_e
->val
, val
, final_static_link
))
4514 /* Record a new literal value. It is illegal to call this if VALUE
4515 already has an entry here. */
4518 add_value_map (value_map_hash_table
*map
,
4519 const literal_value
*val
,
4521 bfd_boolean final_static_link
)
4523 value_map
**bucket_p
;
4526 value_map
*val_e
= (value_map
*) bfd_zmalloc (sizeof (value_map
));
4529 bfd_set_error (bfd_error_no_memory
);
4533 BFD_ASSERT (!value_map_get_cached_value (map
, val
, final_static_link
));
4537 idx
= literal_value_hash (val
);
4538 idx
= idx
& (map
->bucket_count
- 1);
4539 bucket_p
= &map
->buckets
[idx
];
4541 val_e
->next
= *bucket_p
;
4544 /* FIXME: Consider resizing the hash table if we get too many entries. */
4550 /* Lists of text actions (ta_) for narrowing, widening, longcall
4551 conversion, space fill, code & literal removal, etc. */
4553 /* The following text actions are generated:
4555 "ta_remove_insn" remove an instruction or instructions
4556 "ta_remove_longcall" convert longcall to call
4557 "ta_convert_longcall" convert longcall to nop/call
4558 "ta_narrow_insn" narrow a wide instruction
4559 "ta_widen" widen a narrow instruction
4560 "ta_fill" add fill or remove fill
4561 removed < 0 is a fill; branches to the fill address will be
4562 changed to address + fill size (e.g., address - removed)
4563 removed >= 0 branches to the fill address will stay unchanged
4564 "ta_remove_literal" remove a literal; this action is
4565 indicated when a literal is removed
4567 "ta_add_literal" insert a new literal; this action is
4568 indicated when a literal has been moved.
4569 It may use a virtual_offset because
4570 multiple literals can be placed at the
4573 For each of these text actions, we also record the number of bytes
4574 removed by performing the text action. In the case of a "ta_widen"
4575 or a "ta_fill" that adds space, the removed_bytes will be negative. */
4577 typedef struct text_action_struct text_action
;
4578 typedef struct text_action_list_struct text_action_list
;
4579 typedef enum text_action_enum_t text_action_t
;
4581 enum text_action_enum_t
4584 ta_remove_insn
, /* removed = -size */
4585 ta_remove_longcall
, /* removed = -size */
4586 ta_convert_longcall
, /* removed = 0 */
4587 ta_narrow_insn
, /* removed = -1 */
4588 ta_widen_insn
, /* removed = +1 */
4589 ta_fill
, /* removed = +size */
4595 /* Structure for a text action record. */
4596 struct text_action_struct
4598 text_action_t action
;
4599 asection
*sec
; /* Optional */
4601 bfd_vma virtual_offset
; /* Zero except for adding literals. */
4603 literal_value value
; /* Only valid when adding literals. */
4609 /* List of all of the actions taken on a text section. */
4610 struct text_action_list_struct
4616 static text_action
*
4617 find_fill_action (text_action_list
*l
, asection
*sec
, bfd_vma offset
)
4621 /* It is not necessary to fill at the end of a section. */
4622 if (sec
->size
== offset
)
4625 for (m_p
= &l
->head
; *m_p
&& (*m_p
)->offset
<= offset
; m_p
= &(*m_p
)->next
)
4627 text_action
*t
= *m_p
;
4628 /* When the action is another fill at the same address,
4629 just increase the size. */
4630 if (t
->offset
== offset
&& t
->action
== ta_fill
)
4638 compute_removed_action_diff (const text_action
*ta
,
4642 int removable_space
)
4645 int current_removed
= 0;
4648 current_removed
= ta
->removed_bytes
;
4650 BFD_ASSERT (ta
== NULL
|| ta
->offset
== offset
);
4651 BFD_ASSERT (ta
== NULL
|| ta
->action
== ta_fill
);
4653 /* It is not necessary to fill at the end of a section. Clean this up. */
4654 if (sec
->size
== offset
)
4655 new_removed
= removable_space
- 0;
4659 int added
= -removed
- current_removed
;
4660 /* Ignore multiples of the section alignment. */
4661 added
= ((1 << sec
->alignment_power
) - 1) & added
;
4662 new_removed
= (-added
);
4664 /* Modify for removable. */
4665 space
= removable_space
- new_removed
;
4666 new_removed
= (removable_space
4667 - (((1 << sec
->alignment_power
) - 1) & space
));
4669 return (new_removed
- current_removed
);
4674 adjust_fill_action (text_action
*ta
, int fill_diff
)
4676 ta
->removed_bytes
+= fill_diff
;
4680 /* Add a modification action to the text. For the case of adding or
4681 removing space, modify any current fill and assume that
4682 "unreachable_space" bytes can be freely contracted. Note that a
4683 negative removed value is a fill. */
4686 text_action_add (text_action_list
*l
,
4687 text_action_t action
,
4695 /* It is not necessary to fill at the end of a section. */
4696 if (action
== ta_fill
&& sec
->size
== offset
)
4699 /* It is not necessary to fill 0 bytes. */
4700 if (action
== ta_fill
&& removed
== 0)
4703 for (m_p
= &l
->head
; *m_p
&& (*m_p
)->offset
<= offset
; m_p
= &(*m_p
)->next
)
4705 text_action
*t
= *m_p
;
4706 /* When the action is another fill at the same address,
4707 just increase the size. */
4708 if (t
->offset
== offset
&& t
->action
== ta_fill
&& action
== ta_fill
)
4710 t
->removed_bytes
+= removed
;
4715 /* Create a new record and fill it up. */
4716 ta
= (text_action
*) bfd_zmalloc (sizeof (text_action
));
4717 ta
->action
= action
;
4719 ta
->offset
= offset
;
4720 ta
->removed_bytes
= removed
;
4727 text_action_add_literal (text_action_list
*l
,
4728 text_action_t action
,
4730 const literal_value
*value
,
4735 asection
*sec
= r_reloc_get_section (loc
);
4736 bfd_vma offset
= loc
->target_offset
;
4737 bfd_vma virtual_offset
= loc
->virtual_offset
;
4739 BFD_ASSERT (action
== ta_add_literal
);
4741 for (m_p
= &l
->head
; *m_p
!= NULL
; m_p
= &(*m_p
)->next
)
4743 if ((*m_p
)->offset
> offset
4744 && ((*m_p
)->offset
!= offset
4745 || (*m_p
)->virtual_offset
> virtual_offset
))
4749 /* Create a new record and fill it up. */
4750 ta
= (text_action
*) bfd_zmalloc (sizeof (text_action
));
4751 ta
->action
= action
;
4753 ta
->offset
= offset
;
4754 ta
->virtual_offset
= virtual_offset
;
4756 ta
->removed_bytes
= removed
;
4763 offset_with_removed_text (text_action_list
*action_list
, bfd_vma offset
)
4768 for (r
= action_list
->head
; r
&& r
->offset
<= offset
; r
= r
->next
)
4770 if (r
->offset
< offset
4771 || (r
->action
== ta_fill
&& r
->removed_bytes
< 0))
4772 removed
+= r
->removed_bytes
;
4775 return (offset
- removed
);
4780 action_list_count (text_action_list
*action_list
)
4782 text_action
*r
= action_list
->head
;
4784 for (r
= action_list
->head
; r
!= NULL
; r
= r
->next
)
4793 offset_with_removed_text_before_fill (text_action_list
*action_list
,
4799 for (r
= action_list
->head
; r
&& r
->offset
< offset
; r
= r
->next
)
4800 removed
+= r
->removed_bytes
;
4802 return (offset
- removed
);
4806 /* The find_insn_action routine will only find non-fill actions. */
4808 static text_action
*
4809 find_insn_action (text_action_list
*action_list
, bfd_vma offset
)
4812 for (t
= action_list
->head
; t
; t
= t
->next
)
4814 if (t
->offset
== offset
)
4821 case ta_remove_insn
:
4822 case ta_remove_longcall
:
4823 case ta_convert_longcall
:
4824 case ta_narrow_insn
:
4827 case ta_remove_literal
:
4828 case ta_add_literal
:
4841 print_action_list (FILE *fp
, text_action_list
*action_list
)
4845 fprintf (fp
, "Text Action\n");
4846 for (r
= action_list
->head
; r
!= NULL
; r
= r
->next
)
4848 const char *t
= "unknown";
4851 case ta_remove_insn
:
4852 t
= "remove_insn"; break;
4853 case ta_remove_longcall
:
4854 t
= "remove_longcall"; break;
4855 case ta_convert_longcall
:
4856 t
= "remove_longcall"; break;
4857 case ta_narrow_insn
:
4858 t
= "narrow_insn"; break;
4860 t
= "widen_insn"; break;
4865 case ta_remove_literal
:
4866 t
= "remove_literal"; break;
4867 case ta_add_literal
:
4868 t
= "add_literal"; break;
4871 fprintf (fp
, "%s: %s[0x%lx] \"%s\" %d\n",
4872 r
->sec
->owner
->filename
,
4873 r
->sec
->name
, r
->offset
, t
, r
->removed_bytes
);
4880 /* Lists of literals being coalesced or removed. */
4882 /* In the usual case, the literal identified by "from" is being
4883 coalesced with another literal identified by "to". If the literal is
4884 unused and is being removed altogether, "to.abfd" will be NULL.
4885 The removed_literal entries are kept on a per-section list, sorted
4886 by the "from" offset field. */
4888 typedef struct removed_literal_struct removed_literal
;
4889 typedef struct removed_literal_list_struct removed_literal_list
;
4891 struct removed_literal_struct
4895 removed_literal
*next
;
4898 struct removed_literal_list_struct
4900 removed_literal
*head
;
4901 removed_literal
*tail
;
4905 /* Record that the literal at "from" is being removed. If "to" is not
4906 NULL, the "from" literal is being coalesced with the "to" literal. */
4909 add_removed_literal (removed_literal_list
*removed_list
,
4910 const r_reloc
*from
,
4913 removed_literal
*r
, *new_r
, *next_r
;
4915 new_r
= (removed_literal
*) bfd_zmalloc (sizeof (removed_literal
));
4917 new_r
->from
= *from
;
4921 new_r
->to
.abfd
= NULL
;
4924 r
= removed_list
->head
;
4927 removed_list
->head
= new_r
;
4928 removed_list
->tail
= new_r
;
4930 /* Special check for common case of append. */
4931 else if (removed_list
->tail
->from
.target_offset
< from
->target_offset
)
4933 removed_list
->tail
->next
= new_r
;
4934 removed_list
->tail
= new_r
;
4938 while (r
->from
.target_offset
< from
->target_offset
&& r
->next
)
4944 new_r
->next
= next_r
;
4946 removed_list
->tail
= new_r
;
4951 /* Check if the list of removed literals contains an entry for the
4952 given address. Return the entry if found. */
4954 static removed_literal
*
4955 find_removed_literal (removed_literal_list
*removed_list
, bfd_vma addr
)
4957 removed_literal
*r
= removed_list
->head
;
4958 while (r
&& r
->from
.target_offset
< addr
)
4960 if (r
&& r
->from
.target_offset
== addr
)
4969 print_removed_literals (FILE *fp
, removed_literal_list
*removed_list
)
4972 r
= removed_list
->head
;
4974 fprintf (fp
, "Removed Literals\n");
4975 for (; r
!= NULL
; r
= r
->next
)
4977 print_r_reloc (fp
, &r
->from
);
4978 fprintf (fp
, " => ");
4979 if (r
->to
.abfd
== NULL
)
4980 fprintf (fp
, "REMOVED");
4982 print_r_reloc (fp
, &r
->to
);
4990 /* Per-section data for relaxation. */
4992 typedef struct reloc_bfd_fix_struct reloc_bfd_fix
;
4994 struct xtensa_relax_info_struct
4996 bfd_boolean is_relaxable_literal_section
;
4997 bfd_boolean is_relaxable_asm_section
;
4998 int visited
; /* Number of times visited. */
5000 source_reloc
*src_relocs
; /* Array[src_count]. */
5002 int src_next
; /* Next src_relocs entry to assign. */
5004 removed_literal_list removed_list
;
5005 text_action_list action_list
;
5007 reloc_bfd_fix
*fix_list
;
5008 reloc_bfd_fix
*fix_array
;
5009 unsigned fix_array_count
;
5011 /* Support for expanding the reloc array that is stored
5012 in the section structure. If the relocations have been
5013 reallocated, the newly allocated relocations will be referenced
5014 here along with the actual size allocated. The relocation
5015 count will always be found in the section structure. */
5016 Elf_Internal_Rela
*allocated_relocs
;
5017 unsigned relocs_count
;
5018 unsigned allocated_relocs_count
;
5021 struct elf_xtensa_section_data
5023 struct bfd_elf_section_data elf
;
5024 xtensa_relax_info relax_info
;
5029 elf_xtensa_new_section_hook (bfd
*abfd
, asection
*sec
)
5031 if (!sec
->used_by_bfd
)
5033 struct elf_xtensa_section_data
*sdata
;
5034 bfd_size_type amt
= sizeof (*sdata
);
5036 sdata
= bfd_zalloc (abfd
, amt
);
5039 sec
->used_by_bfd
= sdata
;
5042 return _bfd_elf_new_section_hook (abfd
, sec
);
5046 static xtensa_relax_info
*
5047 get_xtensa_relax_info (asection
*sec
)
5049 struct elf_xtensa_section_data
*section_data
;
5051 /* No info available if no section or if it is an output section. */
5052 if (!sec
|| sec
== sec
->output_section
)
5055 section_data
= (struct elf_xtensa_section_data
*) elf_section_data (sec
);
5056 return §ion_data
->relax_info
;
5061 init_xtensa_relax_info (asection
*sec
)
5063 xtensa_relax_info
*relax_info
= get_xtensa_relax_info (sec
);
5065 relax_info
->is_relaxable_literal_section
= FALSE
;
5066 relax_info
->is_relaxable_asm_section
= FALSE
;
5067 relax_info
->visited
= 0;
5069 relax_info
->src_relocs
= NULL
;
5070 relax_info
->src_count
= 0;
5071 relax_info
->src_next
= 0;
5073 relax_info
->removed_list
.head
= NULL
;
5074 relax_info
->removed_list
.tail
= NULL
;
5076 relax_info
->action_list
.head
= NULL
;
5078 relax_info
->fix_list
= NULL
;
5079 relax_info
->fix_array
= NULL
;
5080 relax_info
->fix_array_count
= 0;
5082 relax_info
->allocated_relocs
= NULL
;
5083 relax_info
->relocs_count
= 0;
5084 relax_info
->allocated_relocs_count
= 0;
5088 /* Coalescing literals may require a relocation to refer to a section in
5089 a different input file, but the standard relocation information
5090 cannot express that. Instead, the reloc_bfd_fix structures are used
5091 to "fix" the relocations that refer to sections in other input files.
5092 These structures are kept on per-section lists. The "src_type" field
5093 records the relocation type in case there are multiple relocations on
5094 the same location. FIXME: This is ugly; an alternative might be to
5095 add new symbols with the "owner" field to some other input file. */
5097 struct reloc_bfd_fix_struct
5101 unsigned src_type
; /* Relocation type. */
5104 asection
*target_sec
;
5105 bfd_vma target_offset
;
5106 bfd_boolean translated
;
5108 reloc_bfd_fix
*next
;
5112 static reloc_bfd_fix
*
5113 reloc_bfd_fix_init (asection
*src_sec
,
5117 asection
*target_sec
,
5118 bfd_vma target_offset
,
5119 bfd_boolean translated
)
5123 fix
= (reloc_bfd_fix
*) bfd_malloc (sizeof (reloc_bfd_fix
));
5124 fix
->src_sec
= src_sec
;
5125 fix
->src_offset
= src_offset
;
5126 fix
->src_type
= src_type
;
5127 fix
->target_abfd
= target_abfd
;
5128 fix
->target_sec
= target_sec
;
5129 fix
->target_offset
= target_offset
;
5130 fix
->translated
= translated
;
5137 add_fix (asection
*src_sec
, reloc_bfd_fix
*fix
)
5139 xtensa_relax_info
*relax_info
;
5141 relax_info
= get_xtensa_relax_info (src_sec
);
5142 fix
->next
= relax_info
->fix_list
;
5143 relax_info
->fix_list
= fix
;
5148 fix_compare (const void *ap
, const void *bp
)
5150 const reloc_bfd_fix
*a
= (const reloc_bfd_fix
*) ap
;
5151 const reloc_bfd_fix
*b
= (const reloc_bfd_fix
*) bp
;
5153 if (a
->src_offset
!= b
->src_offset
)
5154 return (a
->src_offset
- b
->src_offset
);
5155 return (a
->src_type
- b
->src_type
);
5160 cache_fix_array (asection
*sec
)
5162 unsigned i
, count
= 0;
5164 xtensa_relax_info
*relax_info
= get_xtensa_relax_info (sec
);
5166 if (relax_info
== NULL
)
5168 if (relax_info
->fix_list
== NULL
)
5171 for (r
= relax_info
->fix_list
; r
!= NULL
; r
= r
->next
)
5174 relax_info
->fix_array
=
5175 (reloc_bfd_fix
*) bfd_malloc (sizeof (reloc_bfd_fix
) * count
);
5176 relax_info
->fix_array_count
= count
;
5178 r
= relax_info
->fix_list
;
5179 for (i
= 0; i
< count
; i
++, r
= r
->next
)
5181 relax_info
->fix_array
[count
- 1 - i
] = *r
;
5182 relax_info
->fix_array
[count
- 1 - i
].next
= NULL
;
5185 qsort (relax_info
->fix_array
, relax_info
->fix_array_count
,
5186 sizeof (reloc_bfd_fix
), fix_compare
);
5190 static reloc_bfd_fix
*
5191 get_bfd_fix (asection
*sec
, bfd_vma offset
, unsigned type
)
5193 xtensa_relax_info
*relax_info
= get_xtensa_relax_info (sec
);
5197 if (relax_info
== NULL
)
5199 if (relax_info
->fix_list
== NULL
)
5202 if (relax_info
->fix_array
== NULL
)
5203 cache_fix_array (sec
);
5205 key
.src_offset
= offset
;
5206 key
.src_type
= type
;
5207 rv
= bsearch (&key
, relax_info
->fix_array
, relax_info
->fix_array_count
,
5208 sizeof (reloc_bfd_fix
), fix_compare
);
5213 /* Section caching. */
5215 typedef struct section_cache_struct section_cache_t
;
5217 struct section_cache_struct
5221 bfd_byte
*contents
; /* Cache of the section contents. */
5222 bfd_size_type content_length
;
5224 property_table_entry
*ptbl
; /* Cache of the section property table. */
5227 Elf_Internal_Rela
*relocs
; /* Cache of the section relocations. */
5228 unsigned reloc_count
;
5233 init_section_cache (section_cache_t
*sec_cache
)
5235 memset (sec_cache
, 0, sizeof (*sec_cache
));
5240 clear_section_cache (section_cache_t
*sec_cache
)
5244 release_contents (sec_cache
->sec
, sec_cache
->contents
);
5245 release_internal_relocs (sec_cache
->sec
, sec_cache
->relocs
);
5246 if (sec_cache
->ptbl
)
5247 free (sec_cache
->ptbl
);
5248 memset (sec_cache
, 0, sizeof (sec_cache
));
5254 section_cache_section (section_cache_t
*sec_cache
,
5256 struct bfd_link_info
*link_info
)
5259 property_table_entry
*prop_table
= NULL
;
5261 bfd_byte
*contents
= NULL
;
5262 Elf_Internal_Rela
*internal_relocs
= NULL
;
5263 bfd_size_type sec_size
;
5267 if (sec
== sec_cache
->sec
)
5271 sec_size
= bfd_get_section_limit (abfd
, sec
);
5273 /* Get the contents. */
5274 contents
= retrieve_contents (abfd
, sec
, link_info
->keep_memory
);
5275 if (contents
== NULL
&& sec_size
!= 0)
5278 /* Get the relocations. */
5279 internal_relocs
= retrieve_internal_relocs (abfd
, sec
,
5280 link_info
->keep_memory
);
5282 /* Get the entry table. */
5283 ptblsize
= xtensa_read_table_entries (abfd
, sec
, &prop_table
,
5284 XTENSA_PROP_SEC_NAME
, FALSE
);
5288 /* Fill in the new section cache. */
5289 clear_section_cache (sec_cache
);
5290 memset (sec_cache
, 0, sizeof (sec_cache
));
5292 sec_cache
->sec
= sec
;
5293 sec_cache
->contents
= contents
;
5294 sec_cache
->content_length
= sec_size
;
5295 sec_cache
->relocs
= internal_relocs
;
5296 sec_cache
->reloc_count
= sec
->reloc_count
;
5297 sec_cache
->pte_count
= ptblsize
;
5298 sec_cache
->ptbl
= prop_table
;
5303 release_contents (sec
, contents
);
5304 release_internal_relocs (sec
, internal_relocs
);
5311 /* Extended basic blocks. */
5313 /* An ebb_struct represents an Extended Basic Block. Within this
5314 range, we guarantee that all instructions are decodable, the
5315 property table entries are contiguous, and no property table
5316 specifies a segment that cannot have instructions moved. This
5317 structure contains caches of the contents, property table and
5318 relocations for the specified section for easy use. The range is
5319 specified by ranges of indices for the byte offset, property table
5320 offsets and relocation offsets. These must be consistent. */
5322 typedef struct ebb_struct ebb_t
;
5328 bfd_byte
*contents
; /* Cache of the section contents. */
5329 bfd_size_type content_length
;
5331 property_table_entry
*ptbl
; /* Cache of the section property table. */
5334 Elf_Internal_Rela
*relocs
; /* Cache of the section relocations. */
5335 unsigned reloc_count
;
5337 bfd_vma start_offset
; /* Offset in section. */
5338 unsigned start_ptbl_idx
; /* Offset in the property table. */
5339 unsigned start_reloc_idx
; /* Offset in the relocations. */
5342 unsigned end_ptbl_idx
;
5343 unsigned end_reloc_idx
;
5345 bfd_boolean ends_section
; /* Is this the last ebb in a section? */
5347 /* The unreachable property table at the end of this set of blocks;
5348 NULL if the end is not an unreachable block. */
5349 property_table_entry
*ends_unreachable
;
5353 enum ebb_target_enum
5356 EBB_DESIRE_TGT_ALIGN
,
5357 EBB_REQUIRE_TGT_ALIGN
,
5358 EBB_REQUIRE_LOOP_ALIGN
,
5363 /* proposed_action_struct is similar to the text_action_struct except
5364 that is represents a potential transformation, not one that will
5365 occur. We build a list of these for an extended basic block
5366 and use them to compute the actual actions desired. We must be
5367 careful that the entire set of actual actions we perform do not
5368 break any relocations that would fit if the actions were not
5371 typedef struct proposed_action_struct proposed_action
;
5373 struct proposed_action_struct
5375 enum ebb_target_enum align_type
; /* for the target alignment */
5376 bfd_vma alignment_pow
;
5377 text_action_t action
;
5380 bfd_boolean do_action
; /* If false, then we will not perform the action. */
5384 /* The ebb_constraint_struct keeps a set of proposed actions for an
5385 extended basic block. */
5387 typedef struct ebb_constraint_struct ebb_constraint
;
5389 struct ebb_constraint_struct
5392 bfd_boolean start_movable
;
5394 /* Bytes of extra space at the beginning if movable. */
5395 int start_extra_space
;
5397 enum ebb_target_enum start_align
;
5399 bfd_boolean end_movable
;
5401 /* Bytes of extra space at the end if movable. */
5402 int end_extra_space
;
5404 unsigned action_count
;
5405 unsigned action_allocated
;
5407 /* Array of proposed actions. */
5408 proposed_action
*actions
;
5410 /* Action alignments -- one for each proposed action. */
5411 enum ebb_target_enum
*action_aligns
;
5416 init_ebb_constraint (ebb_constraint
*c
)
5418 memset (c
, 0, sizeof (ebb_constraint
));
5423 free_ebb_constraint (ebb_constraint
*c
)
5431 init_ebb (ebb_t
*ebb
,
5434 bfd_size_type content_length
,
5435 property_table_entry
*prop_table
,
5437 Elf_Internal_Rela
*internal_relocs
,
5438 unsigned reloc_count
)
5440 memset (ebb
, 0, sizeof (ebb_t
));
5442 ebb
->contents
= contents
;
5443 ebb
->content_length
= content_length
;
5444 ebb
->ptbl
= prop_table
;
5445 ebb
->pte_count
= ptblsize
;
5446 ebb
->relocs
= internal_relocs
;
5447 ebb
->reloc_count
= reloc_count
;
5448 ebb
->start_offset
= 0;
5449 ebb
->end_offset
= ebb
->content_length
- 1;
5450 ebb
->start_ptbl_idx
= 0;
5451 ebb
->end_ptbl_idx
= ptblsize
;
5452 ebb
->start_reloc_idx
= 0;
5453 ebb
->end_reloc_idx
= reloc_count
;
5457 /* Extend the ebb to all decodable contiguous sections. The algorithm
5458 for building a basic block around an instruction is to push it
5459 forward until we hit the end of a section, an unreachable block or
5460 a block that cannot be transformed. Then we push it backwards
5461 searching for similar conditions. */
5463 static bfd_boolean
extend_ebb_bounds_forward (ebb_t
*);
5464 static bfd_boolean
extend_ebb_bounds_backward (ebb_t
*);
5465 static bfd_size_type insn_block_decodable_len
5466 (bfd_byte
*, bfd_size_type
, bfd_vma
, bfd_size_type
);
5469 extend_ebb_bounds (ebb_t
*ebb
)
5471 if (!extend_ebb_bounds_forward (ebb
))
5473 if (!extend_ebb_bounds_backward (ebb
))
5480 extend_ebb_bounds_forward (ebb_t
*ebb
)
5482 property_table_entry
*the_entry
, *new_entry
;
5484 the_entry
= &ebb
->ptbl
[ebb
->end_ptbl_idx
];
5486 /* Stop when (1) we cannot decode an instruction, (2) we are at
5487 the end of the property tables, (3) we hit a non-contiguous property
5488 table entry, (4) we hit a NO_TRANSFORM region. */
5493 bfd_size_type insn_block_len
;
5495 entry_end
= the_entry
->address
- ebb
->sec
->vma
+ the_entry
->size
;
5497 insn_block_decodable_len (ebb
->contents
, ebb
->content_length
,
5499 entry_end
- ebb
->end_offset
);
5500 if (insn_block_len
!= (entry_end
- ebb
->end_offset
))
5502 (*_bfd_error_handler
)
5503 (_("%B(%A+0x%lx): could not decode instruction; possible configuration mismatch"),
5504 ebb
->sec
->owner
, ebb
->sec
, ebb
->end_offset
+ insn_block_len
);
5507 ebb
->end_offset
+= insn_block_len
;
5509 if (ebb
->end_offset
== ebb
->sec
->size
)
5510 ebb
->ends_section
= TRUE
;
5512 /* Update the reloc counter. */
5513 while (ebb
->end_reloc_idx
+ 1 < ebb
->reloc_count
5514 && (ebb
->relocs
[ebb
->end_reloc_idx
+ 1].r_offset
5517 ebb
->end_reloc_idx
++;
5520 if (ebb
->end_ptbl_idx
+ 1 == ebb
->pte_count
)
5523 new_entry
= &ebb
->ptbl
[ebb
->end_ptbl_idx
+ 1];
5524 if (((new_entry
->flags
& XTENSA_PROP_INSN
) == 0)
5525 || ((new_entry
->flags
& XTENSA_PROP_INSN_NO_TRANSFORM
) != 0)
5526 || ((the_entry
->flags
& XTENSA_PROP_ALIGN
) != 0))
5529 if (the_entry
->address
+ the_entry
->size
!= new_entry
->address
)
5532 the_entry
= new_entry
;
5533 ebb
->end_ptbl_idx
++;
5536 /* Quick check for an unreachable or end of file just at the end. */
5537 if (ebb
->end_ptbl_idx
+ 1 == ebb
->pte_count
)
5539 if (ebb
->end_offset
== ebb
->content_length
)
5540 ebb
->ends_section
= TRUE
;
5544 new_entry
= &ebb
->ptbl
[ebb
->end_ptbl_idx
+ 1];
5545 if ((new_entry
->flags
& XTENSA_PROP_UNREACHABLE
) != 0
5546 && the_entry
->address
+ the_entry
->size
== new_entry
->address
)
5547 ebb
->ends_unreachable
= new_entry
;
5550 /* Any other ending requires exact alignment. */
5556 extend_ebb_bounds_backward (ebb_t
*ebb
)
5558 property_table_entry
*the_entry
, *new_entry
;
5560 the_entry
= &ebb
->ptbl
[ebb
->start_ptbl_idx
];
5562 /* Stop when (1) we cannot decode the instructions in the current entry.
5563 (2) we are at the beginning of the property tables, (3) we hit a
5564 non-contiguous property table entry, (4) we hit a NO_TRANSFORM region. */
5568 bfd_vma block_begin
;
5569 bfd_size_type insn_block_len
;
5571 block_begin
= the_entry
->address
- ebb
->sec
->vma
;
5573 insn_block_decodable_len (ebb
->contents
, ebb
->content_length
,
5575 ebb
->start_offset
- block_begin
);
5576 if (insn_block_len
!= ebb
->start_offset
- block_begin
)
5578 (*_bfd_error_handler
)
5579 (_("%B(%A+0x%lx): could not decode instruction; possible configuration mismatch"),
5580 ebb
->sec
->owner
, ebb
->sec
, ebb
->end_offset
+ insn_block_len
);
5583 ebb
->start_offset
-= insn_block_len
;
5585 /* Update the reloc counter. */
5586 while (ebb
->start_reloc_idx
> 0
5587 && (ebb
->relocs
[ebb
->start_reloc_idx
- 1].r_offset
5588 >= ebb
->start_offset
))
5590 ebb
->start_reloc_idx
--;
5593 if (ebb
->start_ptbl_idx
== 0)
5596 new_entry
= &ebb
->ptbl
[ebb
->start_ptbl_idx
- 1];
5597 if ((new_entry
->flags
& XTENSA_PROP_INSN
) == 0
5598 || ((new_entry
->flags
& XTENSA_PROP_INSN_NO_TRANSFORM
) != 0)
5599 || ((new_entry
->flags
& XTENSA_PROP_ALIGN
) != 0))
5601 if (new_entry
->address
+ new_entry
->size
!= the_entry
->address
)
5604 the_entry
= new_entry
;
5605 ebb
->start_ptbl_idx
--;
5611 static bfd_size_type
5612 insn_block_decodable_len (bfd_byte
*contents
,
5613 bfd_size_type content_len
,
5614 bfd_vma block_offset
,
5615 bfd_size_type block_len
)
5617 bfd_vma offset
= block_offset
;
5619 while (offset
< block_offset
+ block_len
)
5621 bfd_size_type insn_len
= 0;
5623 insn_len
= insn_decode_len (contents
, content_len
, offset
);
5625 return (offset
- block_offset
);
5628 return (offset
- block_offset
);
5633 ebb_propose_action (ebb_constraint
*c
,
5634 enum ebb_target_enum align_type
,
5635 bfd_vma alignment_pow
,
5636 text_action_t action
,
5639 bfd_boolean do_action
)
5641 proposed_action
*act
;
5643 if (c
->action_allocated
<= c
->action_count
)
5645 unsigned new_allocated
, i
;
5646 proposed_action
*new_actions
;
5648 new_allocated
= (c
->action_count
+ 2) * 2;
5649 new_actions
= (proposed_action
*)
5650 bfd_zmalloc (sizeof (proposed_action
) * new_allocated
);
5652 for (i
= 0; i
< c
->action_count
; i
++)
5653 new_actions
[i
] = c
->actions
[i
];
5656 c
->actions
= new_actions
;
5657 c
->action_allocated
= new_allocated
;
5660 act
= &c
->actions
[c
->action_count
];
5661 act
->align_type
= align_type
;
5662 act
->alignment_pow
= alignment_pow
;
5663 act
->action
= action
;
5664 act
->offset
= offset
;
5665 act
->removed_bytes
= removed_bytes
;
5666 act
->do_action
= do_action
;
5672 /* Access to internal relocations, section contents and symbols. */
5674 /* During relaxation, we need to modify relocations, section contents,
5675 and symbol definitions, and we need to keep the original values from
5676 being reloaded from the input files, i.e., we need to "pin" the
5677 modified values in memory. We also want to continue to observe the
5678 setting of the "keep-memory" flag. The following functions wrap the
5679 standard BFD functions to take care of this for us. */
5681 static Elf_Internal_Rela
*
5682 retrieve_internal_relocs (bfd
*abfd
, asection
*sec
, bfd_boolean keep_memory
)
5684 Elf_Internal_Rela
*internal_relocs
;
5686 if ((sec
->flags
& SEC_LINKER_CREATED
) != 0)
5689 internal_relocs
= elf_section_data (sec
)->relocs
;
5690 if (internal_relocs
== NULL
)
5691 internal_relocs
= (_bfd_elf_link_read_relocs
5692 (abfd
, sec
, NULL
, NULL
, keep_memory
));
5693 return internal_relocs
;
5698 pin_internal_relocs (asection
*sec
, Elf_Internal_Rela
*internal_relocs
)
5700 elf_section_data (sec
)->relocs
= internal_relocs
;
5705 release_internal_relocs (asection
*sec
, Elf_Internal_Rela
*internal_relocs
)
5708 && elf_section_data (sec
)->relocs
!= internal_relocs
)
5709 free (internal_relocs
);
5714 retrieve_contents (bfd
*abfd
, asection
*sec
, bfd_boolean keep_memory
)
5717 bfd_size_type sec_size
;
5719 sec_size
= bfd_get_section_limit (abfd
, sec
);
5720 contents
= elf_section_data (sec
)->this_hdr
.contents
;
5722 if (contents
== NULL
&& sec_size
!= 0)
5724 if (!bfd_malloc_and_get_section (abfd
, sec
, &contents
))
5731 elf_section_data (sec
)->this_hdr
.contents
= contents
;
5738 pin_contents (asection
*sec
, bfd_byte
*contents
)
5740 elf_section_data (sec
)->this_hdr
.contents
= contents
;
5745 release_contents (asection
*sec
, bfd_byte
*contents
)
5747 if (contents
&& elf_section_data (sec
)->this_hdr
.contents
!= contents
)
5752 static Elf_Internal_Sym
*
5753 retrieve_local_syms (bfd
*input_bfd
)
5755 Elf_Internal_Shdr
*symtab_hdr
;
5756 Elf_Internal_Sym
*isymbuf
;
5759 symtab_hdr
= &elf_tdata (input_bfd
)->symtab_hdr
;
5760 locsymcount
= symtab_hdr
->sh_info
;
5762 isymbuf
= (Elf_Internal_Sym
*) symtab_hdr
->contents
;
5763 if (isymbuf
== NULL
&& locsymcount
!= 0)
5764 isymbuf
= bfd_elf_get_elf_syms (input_bfd
, symtab_hdr
, locsymcount
, 0,
5767 /* Save the symbols for this input file so they won't be read again. */
5768 if (isymbuf
&& isymbuf
!= (Elf_Internal_Sym
*) symtab_hdr
->contents
)
5769 symtab_hdr
->contents
= (unsigned char *) isymbuf
;
5775 /* Code for link-time relaxation. */
5777 /* Initialization for relaxation: */
5778 static bfd_boolean
analyze_relocations (struct bfd_link_info
*);
5779 static bfd_boolean find_relaxable_sections
5780 (bfd
*, asection
*, struct bfd_link_info
*, bfd_boolean
*);
5781 static bfd_boolean collect_source_relocs
5782 (bfd
*, asection
*, struct bfd_link_info
*);
5783 static bfd_boolean is_resolvable_asm_expansion
5784 (bfd
*, asection
*, bfd_byte
*, Elf_Internal_Rela
*, struct bfd_link_info
*,
5786 static Elf_Internal_Rela
*find_associated_l32r_irel
5787 (bfd
*, asection
*, bfd_byte
*, Elf_Internal_Rela
*, Elf_Internal_Rela
*);
5788 static bfd_boolean compute_text_actions
5789 (bfd
*, asection
*, struct bfd_link_info
*);
5790 static bfd_boolean
compute_ebb_proposed_actions (ebb_constraint
*);
5791 static bfd_boolean
compute_ebb_actions (ebb_constraint
*);
5792 static bfd_boolean check_section_ebb_pcrels_fit
5793 (bfd
*, asection
*, bfd_byte
*, Elf_Internal_Rela
*, const ebb_constraint
*,
5794 const xtensa_opcode
*);
5795 static bfd_boolean
check_section_ebb_reduces (const ebb_constraint
*);
5796 static void text_action_add_proposed
5797 (text_action_list
*, const ebb_constraint
*, asection
*);
5798 static int compute_fill_extra_space (property_table_entry
*);
5801 static bfd_boolean compute_removed_literals
5802 (bfd
*, asection
*, struct bfd_link_info
*, value_map_hash_table
*);
5803 static Elf_Internal_Rela
*get_irel_at_offset
5804 (asection
*, Elf_Internal_Rela
*, bfd_vma
);
5805 static bfd_boolean is_removable_literal
5806 (const source_reloc
*, int, const source_reloc
*, int);
5807 static bfd_boolean remove_dead_literal
5808 (bfd
*, asection
*, struct bfd_link_info
*, Elf_Internal_Rela
*,
5809 Elf_Internal_Rela
*, source_reloc
*, property_table_entry
*, int);
5810 static bfd_boolean identify_literal_placement
5811 (bfd
*, asection
*, bfd_byte
*, struct bfd_link_info
*,
5812 value_map_hash_table
*, bfd_boolean
*, Elf_Internal_Rela
*, int,
5813 source_reloc
*, property_table_entry
*, int, section_cache_t
*,
5815 static bfd_boolean
relocations_reach (source_reloc
*, int, const r_reloc
*);
5816 static bfd_boolean coalesce_shared_literal
5817 (asection
*, source_reloc
*, property_table_entry
*, int, value_map
*);
5818 static bfd_boolean move_shared_literal
5819 (asection
*, struct bfd_link_info
*, source_reloc
*, property_table_entry
*,
5820 int, const r_reloc
*, const literal_value
*, section_cache_t
*);
5823 static bfd_boolean
relax_section (bfd
*, asection
*, struct bfd_link_info
*);
5824 static bfd_boolean
translate_section_fixes (asection
*);
5825 static bfd_boolean
translate_reloc_bfd_fix (reloc_bfd_fix
*);
5826 static void translate_reloc (const r_reloc
*, r_reloc
*);
5827 static void shrink_dynamic_reloc_sections
5828 (struct bfd_link_info
*, bfd
*, asection
*, Elf_Internal_Rela
*);
5829 static bfd_boolean move_literal
5830 (bfd
*, struct bfd_link_info
*, asection
*, bfd_vma
, bfd_byte
*,
5831 xtensa_relax_info
*, Elf_Internal_Rela
**, const literal_value
*);
5832 static bfd_boolean relax_property_section
5833 (bfd
*, asection
*, struct bfd_link_info
*);
5836 static bfd_boolean
relax_section_symbols (bfd
*, asection
*);
5840 elf_xtensa_relax_section (bfd
*abfd
,
5842 struct bfd_link_info
*link_info
,
5845 static value_map_hash_table
*values
= NULL
;
5846 static bfd_boolean relocations_analyzed
= FALSE
;
5847 xtensa_relax_info
*relax_info
;
5849 if (!relocations_analyzed
)
5851 /* Do some overall initialization for relaxation. */
5852 values
= value_map_hash_table_init ();
5855 relaxing_section
= TRUE
;
5856 if (!analyze_relocations (link_info
))
5858 relocations_analyzed
= TRUE
;
5862 /* Don't mess with linker-created sections. */
5863 if ((sec
->flags
& SEC_LINKER_CREATED
) != 0)
5866 relax_info
= get_xtensa_relax_info (sec
);
5867 BFD_ASSERT (relax_info
!= NULL
);
5869 switch (relax_info
->visited
)
5872 /* Note: It would be nice to fold this pass into
5873 analyze_relocations, but it is important for this step that the
5874 sections be examined in link order. */
5875 if (!compute_removed_literals (abfd
, sec
, link_info
, values
))
5882 value_map_hash_table_delete (values
);
5884 if (!relax_section (abfd
, sec
, link_info
))
5890 if (!relax_section_symbols (abfd
, sec
))
5895 relax_info
->visited
++;
5900 /* Initialization for relaxation. */
5902 /* This function is called once at the start of relaxation. It scans
5903 all the input sections and marks the ones that are relaxable (i.e.,
5904 literal sections with L32R relocations against them), and then
5905 collects source_reloc information for all the relocations against
5906 those relaxable sections. During this process, it also detects
5907 longcalls, i.e., calls relaxed by the assembler into indirect
5908 calls, that can be optimized back into direct calls. Within each
5909 extended basic block (ebb) containing an optimized longcall, it
5910 computes a set of "text actions" that can be performed to remove
5911 the L32R associated with the longcall while optionally preserving
5912 branch target alignments. */
5915 analyze_relocations (struct bfd_link_info
*link_info
)
5919 bfd_boolean is_relaxable
= FALSE
;
5921 /* Initialize the per-section relaxation info. */
5922 for (abfd
= link_info
->input_bfds
; abfd
!= NULL
; abfd
= abfd
->link_next
)
5923 for (sec
= abfd
->sections
; sec
!= NULL
; sec
= sec
->next
)
5925 init_xtensa_relax_info (sec
);
5928 /* Mark relaxable sections (and count relocations against each one). */
5929 for (abfd
= link_info
->input_bfds
; abfd
!= NULL
; abfd
= abfd
->link_next
)
5930 for (sec
= abfd
->sections
; sec
!= NULL
; sec
= sec
->next
)
5932 if (!find_relaxable_sections (abfd
, sec
, link_info
, &is_relaxable
))
5936 /* Bail out if there are no relaxable sections. */
5940 /* Allocate space for source_relocs. */
5941 for (abfd
= link_info
->input_bfds
; abfd
!= NULL
; abfd
= abfd
->link_next
)
5942 for (sec
= abfd
->sections
; sec
!= NULL
; sec
= sec
->next
)
5944 xtensa_relax_info
*relax_info
;
5946 relax_info
= get_xtensa_relax_info (sec
);
5947 if (relax_info
->is_relaxable_literal_section
5948 || relax_info
->is_relaxable_asm_section
)
5950 relax_info
->src_relocs
= (source_reloc
*)
5951 bfd_malloc (relax_info
->src_count
* sizeof (source_reloc
));
5954 relax_info
->src_count
= 0;
5957 /* Collect info on relocations against each relaxable section. */
5958 for (abfd
= link_info
->input_bfds
; abfd
!= NULL
; abfd
= abfd
->link_next
)
5959 for (sec
= abfd
->sections
; sec
!= NULL
; sec
= sec
->next
)
5961 if (!collect_source_relocs (abfd
, sec
, link_info
))
5965 /* Compute the text actions. */
5966 for (abfd
= link_info
->input_bfds
; abfd
!= NULL
; abfd
= abfd
->link_next
)
5967 for (sec
= abfd
->sections
; sec
!= NULL
; sec
= sec
->next
)
5969 if (!compute_text_actions (abfd
, sec
, link_info
))
5977 /* Find all the sections that might be relaxed. The motivation for
5978 this pass is that collect_source_relocs() needs to record _all_ the
5979 relocations that target each relaxable section. That is expensive
5980 and unnecessary unless the target section is actually going to be
5981 relaxed. This pass identifies all such sections by checking if
5982 they have L32Rs pointing to them. In the process, the total number
5983 of relocations targeting each section is also counted so that we
5984 know how much space to allocate for source_relocs against each
5985 relaxable literal section. */
5988 find_relaxable_sections (bfd
*abfd
,
5990 struct bfd_link_info
*link_info
,
5991 bfd_boolean
*is_relaxable_p
)
5993 Elf_Internal_Rela
*internal_relocs
;
5995 bfd_boolean ok
= TRUE
;
5997 xtensa_relax_info
*source_relax_info
;
5998 bfd_boolean is_l32r_reloc
;
6000 internal_relocs
= retrieve_internal_relocs (abfd
, sec
,
6001 link_info
->keep_memory
);
6002 if (internal_relocs
== NULL
)
6005 contents
= retrieve_contents (abfd
, sec
, link_info
->keep_memory
);
6006 if (contents
== NULL
&& sec
->size
!= 0)
6012 source_relax_info
= get_xtensa_relax_info (sec
);
6013 for (i
= 0; i
< sec
->reloc_count
; i
++)
6015 Elf_Internal_Rela
*irel
= &internal_relocs
[i
];
6017 asection
*target_sec
;
6018 xtensa_relax_info
*target_relax_info
;
6020 /* If this section has not already been marked as "relaxable", and
6021 if it contains any ASM_EXPAND relocations (marking expanded
6022 longcalls) that can be optimized into direct calls, then mark
6023 the section as "relaxable". */
6024 if (source_relax_info
6025 && !source_relax_info
->is_relaxable_asm_section
6026 && ELF32_R_TYPE (irel
->r_info
) == R_XTENSA_ASM_EXPAND
)
6028 bfd_boolean is_reachable
= FALSE
;
6029 if (is_resolvable_asm_expansion (abfd
, sec
, contents
, irel
,
6030 link_info
, &is_reachable
)
6033 source_relax_info
->is_relaxable_asm_section
= TRUE
;
6034 *is_relaxable_p
= TRUE
;
6038 r_reloc_init (&r_rel
, abfd
, irel
, contents
,
6039 bfd_get_section_limit (abfd
, sec
));
6041 target_sec
= r_reloc_get_section (&r_rel
);
6042 target_relax_info
= get_xtensa_relax_info (target_sec
);
6043 if (!target_relax_info
)
6046 /* Count PC-relative operand relocations against the target section.
6047 Note: The conditions tested here must match the conditions under
6048 which init_source_reloc is called in collect_source_relocs(). */
6049 is_l32r_reloc
= FALSE
;
6050 if (is_operand_relocation (ELF32_R_TYPE (irel
->r_info
)))
6052 xtensa_opcode opcode
=
6053 get_relocation_opcode (abfd
, sec
, contents
, irel
);
6054 if (opcode
!= XTENSA_UNDEFINED
)
6056 is_l32r_reloc
= (opcode
== get_l32r_opcode ());
6057 if (!is_alt_relocation (ELF32_R_TYPE (irel
->r_info
))
6059 target_relax_info
->src_count
++;
6063 if (is_l32r_reloc
&& r_reloc_is_defined (&r_rel
))
6065 /* Mark the target section as relaxable. */
6066 target_relax_info
->is_relaxable_literal_section
= TRUE
;
6067 *is_relaxable_p
= TRUE
;
6072 release_contents (sec
, contents
);
6073 release_internal_relocs (sec
, internal_relocs
);
6078 /* Record _all_ the relocations that point to relaxable sections, and
6079 get rid of ASM_EXPAND relocs by either converting them to
6080 ASM_SIMPLIFY or by removing them. */
6083 collect_source_relocs (bfd
*abfd
,
6085 struct bfd_link_info
*link_info
)
6087 Elf_Internal_Rela
*internal_relocs
;
6089 bfd_boolean ok
= TRUE
;
6091 bfd_size_type sec_size
;
6093 internal_relocs
= retrieve_internal_relocs (abfd
, sec
,
6094 link_info
->keep_memory
);
6095 if (internal_relocs
== NULL
)
6098 sec_size
= bfd_get_section_limit (abfd
, sec
);
6099 contents
= retrieve_contents (abfd
, sec
, link_info
->keep_memory
);
6100 if (contents
== NULL
&& sec_size
!= 0)
6106 /* Record relocations against relaxable literal sections. */
6107 for (i
= 0; i
< sec
->reloc_count
; i
++)
6109 Elf_Internal_Rela
*irel
= &internal_relocs
[i
];
6111 asection
*target_sec
;
6112 xtensa_relax_info
*target_relax_info
;
6114 r_reloc_init (&r_rel
, abfd
, irel
, contents
, sec_size
);
6116 target_sec
= r_reloc_get_section (&r_rel
);
6117 target_relax_info
= get_xtensa_relax_info (target_sec
);
6119 if (target_relax_info
6120 && (target_relax_info
->is_relaxable_literal_section
6121 || target_relax_info
->is_relaxable_asm_section
))
6123 xtensa_opcode opcode
= XTENSA_UNDEFINED
;
6125 bfd_boolean is_abs_literal
= FALSE
;
6127 if (is_alt_relocation (ELF32_R_TYPE (irel
->r_info
)))
6129 /* None of the current alternate relocs are PC-relative,
6130 and only PC-relative relocs matter here. However, we
6131 still need to record the opcode for literal
6133 opcode
= get_relocation_opcode (abfd
, sec
, contents
, irel
);
6134 if (opcode
== get_l32r_opcode ())
6136 is_abs_literal
= TRUE
;
6140 opcode
= XTENSA_UNDEFINED
;
6142 else if (is_operand_relocation (ELF32_R_TYPE (irel
->r_info
)))
6144 opcode
= get_relocation_opcode (abfd
, sec
, contents
, irel
);
6145 opnd
= get_relocation_opnd (opcode
, ELF32_R_TYPE (irel
->r_info
));
6148 if (opcode
!= XTENSA_UNDEFINED
)
6150 int src_next
= target_relax_info
->src_next
++;
6151 source_reloc
*s_reloc
= &target_relax_info
->src_relocs
[src_next
];
6153 init_source_reloc (s_reloc
, sec
, &r_rel
, opcode
, opnd
,
6159 /* Now get rid of ASM_EXPAND relocations. At this point, the
6160 src_relocs array for the target literal section may still be
6161 incomplete, but it must at least contain the entries for the L32R
6162 relocations associated with ASM_EXPANDs because they were just
6163 added in the preceding loop over the relocations. */
6165 for (i
= 0; i
< sec
->reloc_count
; i
++)
6167 Elf_Internal_Rela
*irel
= &internal_relocs
[i
];
6168 bfd_boolean is_reachable
;
6170 if (!is_resolvable_asm_expansion (abfd
, sec
, contents
, irel
, link_info
,
6176 Elf_Internal_Rela
*l32r_irel
;
6178 asection
*target_sec
;
6179 xtensa_relax_info
*target_relax_info
;
6181 /* Mark the source_reloc for the L32R so that it will be
6182 removed in compute_removed_literals(), along with the
6183 associated literal. */
6184 l32r_irel
= find_associated_l32r_irel (abfd
, sec
, contents
,
6185 irel
, internal_relocs
);
6186 if (l32r_irel
== NULL
)
6189 r_reloc_init (&r_rel
, abfd
, l32r_irel
, contents
, sec_size
);
6191 target_sec
= r_reloc_get_section (&r_rel
);
6192 target_relax_info
= get_xtensa_relax_info (target_sec
);
6194 if (target_relax_info
6195 && (target_relax_info
->is_relaxable_literal_section
6196 || target_relax_info
->is_relaxable_asm_section
))
6198 source_reloc
*s_reloc
;
6200 /* Search the source_relocs for the entry corresponding to
6201 the l32r_irel. Note: The src_relocs array is not yet
6202 sorted, but it wouldn't matter anyway because we're
6203 searching by source offset instead of target offset. */
6204 s_reloc
= find_source_reloc (target_relax_info
->src_relocs
,
6205 target_relax_info
->src_next
,
6207 BFD_ASSERT (s_reloc
);
6208 s_reloc
->is_null
= TRUE
;
6211 /* Convert this reloc to ASM_SIMPLIFY. */
6212 irel
->r_info
= ELF32_R_INFO (ELF32_R_SYM (irel
->r_info
),
6213 R_XTENSA_ASM_SIMPLIFY
);
6214 l32r_irel
->r_info
= ELF32_R_INFO (0, R_XTENSA_NONE
);
6216 pin_internal_relocs (sec
, internal_relocs
);
6220 /* It is resolvable but doesn't reach. We resolve now
6221 by eliminating the relocation -- the call will remain
6222 expanded into L32R/CALLX. */
6223 irel
->r_info
= ELF32_R_INFO (0, R_XTENSA_NONE
);
6224 pin_internal_relocs (sec
, internal_relocs
);
6229 release_contents (sec
, contents
);
6230 release_internal_relocs (sec
, internal_relocs
);
6235 /* Return TRUE if the asm expansion can be resolved. Generally it can
6236 be resolved on a final link or when a partial link locates it in the
6237 same section as the target. Set "is_reachable" flag if the target of
6238 the call is within the range of a direct call, given the current VMA
6239 for this section and the target section. */
6242 is_resolvable_asm_expansion (bfd
*abfd
,
6245 Elf_Internal_Rela
*irel
,
6246 struct bfd_link_info
*link_info
,
6247 bfd_boolean
*is_reachable_p
)
6249 asection
*target_sec
;
6250 bfd_vma target_offset
;
6252 xtensa_opcode opcode
, direct_call_opcode
;
6253 bfd_vma self_address
;
6254 bfd_vma dest_address
;
6255 bfd_boolean uses_l32r
;
6256 bfd_size_type sec_size
;
6258 *is_reachable_p
= FALSE
;
6260 if (contents
== NULL
)
6263 if (ELF32_R_TYPE (irel
->r_info
) != R_XTENSA_ASM_EXPAND
)
6266 sec_size
= bfd_get_section_limit (abfd
, sec
);
6267 opcode
= get_expanded_call_opcode (contents
+ irel
->r_offset
,
6268 sec_size
- irel
->r_offset
, &uses_l32r
);
6269 /* Optimization of longcalls that use CONST16 is not yet implemented. */
6273 direct_call_opcode
= swap_callx_for_call_opcode (opcode
);
6274 if (direct_call_opcode
== XTENSA_UNDEFINED
)
6277 /* Check and see that the target resolves. */
6278 r_reloc_init (&r_rel
, abfd
, irel
, contents
, sec_size
);
6279 if (!r_reloc_is_defined (&r_rel
))
6282 target_sec
= r_reloc_get_section (&r_rel
);
6283 target_offset
= r_rel
.target_offset
;
6285 /* If the target is in a shared library, then it doesn't reach. This
6286 isn't supposed to come up because the compiler should never generate
6287 non-PIC calls on systems that use shared libraries, but the linker
6288 shouldn't crash regardless. */
6289 if (!target_sec
->output_section
)
6292 /* For relocatable sections, we can only simplify when the output
6293 section of the target is the same as the output section of the
6295 if (link_info
->relocatable
6296 && (target_sec
->output_section
!= sec
->output_section
6297 || is_reloc_sym_weak (abfd
, irel
)))
6300 self_address
= (sec
->output_section
->vma
6301 + sec
->output_offset
+ irel
->r_offset
+ 3);
6302 dest_address
= (target_sec
->output_section
->vma
6303 + target_sec
->output_offset
+ target_offset
);
6305 *is_reachable_p
= pcrel_reloc_fits (direct_call_opcode
, 0,
6306 self_address
, dest_address
);
6308 if ((self_address
>> CALL_SEGMENT_BITS
) !=
6309 (dest_address
>> CALL_SEGMENT_BITS
))
6316 static Elf_Internal_Rela
*
6317 find_associated_l32r_irel (bfd
*abfd
,
6320 Elf_Internal_Rela
*other_irel
,
6321 Elf_Internal_Rela
*internal_relocs
)
6325 for (i
= 0; i
< sec
->reloc_count
; i
++)
6327 Elf_Internal_Rela
*irel
= &internal_relocs
[i
];
6329 if (irel
== other_irel
)
6331 if (irel
->r_offset
!= other_irel
->r_offset
)
6333 if (is_l32r_relocation (abfd
, sec
, contents
, irel
))
6341 static xtensa_opcode
*
6342 build_reloc_opcodes (bfd
*abfd
,
6345 Elf_Internal_Rela
*internal_relocs
)
6348 xtensa_opcode
*reloc_opcodes
=
6349 (xtensa_opcode
*) bfd_malloc (sizeof (xtensa_opcode
) * sec
->reloc_count
);
6350 for (i
= 0; i
< sec
->reloc_count
; i
++)
6352 Elf_Internal_Rela
*irel
= &internal_relocs
[i
];
6353 reloc_opcodes
[i
] = get_relocation_opcode (abfd
, sec
, contents
, irel
);
6355 return reloc_opcodes
;
6359 /* The compute_text_actions function will build a list of potential
6360 transformation actions for code in the extended basic block of each
6361 longcall that is optimized to a direct call. From this list we
6362 generate a set of actions to actually perform that optimizes for
6363 space and, if not using size_opt, maintains branch target
6366 These actions to be performed are placed on a per-section list.
6367 The actual changes are performed by relax_section() in the second
6371 compute_text_actions (bfd
*abfd
,
6373 struct bfd_link_info
*link_info
)
6375 xtensa_opcode
*reloc_opcodes
= NULL
;
6376 xtensa_relax_info
*relax_info
;
6378 Elf_Internal_Rela
*internal_relocs
;
6379 bfd_boolean ok
= TRUE
;
6381 property_table_entry
*prop_table
= 0;
6383 bfd_size_type sec_size
;
6385 relax_info
= get_xtensa_relax_info (sec
);
6386 BFD_ASSERT (relax_info
);
6387 BFD_ASSERT (relax_info
->src_next
== relax_info
->src_count
);
6389 /* Do nothing if the section contains no optimized longcalls. */
6390 if (!relax_info
->is_relaxable_asm_section
)
6393 internal_relocs
= retrieve_internal_relocs (abfd
, sec
,
6394 link_info
->keep_memory
);
6396 if (internal_relocs
)
6397 qsort (internal_relocs
, sec
->reloc_count
, sizeof (Elf_Internal_Rela
),
6398 internal_reloc_compare
);
6400 sec_size
= bfd_get_section_limit (abfd
, sec
);
6401 contents
= retrieve_contents (abfd
, sec
, link_info
->keep_memory
);
6402 if (contents
== NULL
&& sec_size
!= 0)
6408 ptblsize
= xtensa_read_table_entries (abfd
, sec
, &prop_table
,
6409 XTENSA_PROP_SEC_NAME
, FALSE
);
6416 for (i
= 0; i
< sec
->reloc_count
; i
++)
6418 Elf_Internal_Rela
*irel
= &internal_relocs
[i
];
6420 property_table_entry
*the_entry
;
6423 ebb_constraint ebb_table
;
6424 bfd_size_type simplify_size
;
6426 if (irel
&& ELF32_R_TYPE (irel
->r_info
) != R_XTENSA_ASM_SIMPLIFY
)
6428 r_offset
= irel
->r_offset
;
6430 simplify_size
= get_asm_simplify_size (contents
, sec_size
, r_offset
);
6431 if (simplify_size
== 0)
6433 (*_bfd_error_handler
)
6434 (_("%B(%A+0x%lx): could not decode instruction for XTENSA_ASM_SIMPLIFY relocation; possible configuration mismatch"),
6435 sec
->owner
, sec
, r_offset
);
6439 /* If the instruction table is not around, then don't do this
6441 the_entry
= elf_xtensa_find_property_entry (prop_table
, ptblsize
,
6442 sec
->vma
+ irel
->r_offset
);
6443 if (the_entry
== NULL
|| XTENSA_NO_NOP_REMOVAL
)
6445 text_action_add (&relax_info
->action_list
,
6446 ta_convert_longcall
, sec
, r_offset
,
6451 /* If the next longcall happens to be at the same address as an
6452 unreachable section of size 0, then skip forward. */
6453 ptbl_idx
= the_entry
- prop_table
;
6454 while ((the_entry
->flags
& XTENSA_PROP_UNREACHABLE
)
6455 && the_entry
->size
== 0
6456 && ptbl_idx
+ 1 < ptblsize
6457 && (prop_table
[ptbl_idx
+ 1].address
6458 == prop_table
[ptbl_idx
].address
))
6464 if (the_entry
->flags
& XTENSA_PROP_INSN_NO_TRANSFORM
)
6465 /* NO_REORDER is OK */
6468 init_ebb_constraint (&ebb_table
);
6469 ebb
= &ebb_table
.ebb
;
6470 init_ebb (ebb
, sec
, contents
, sec_size
, prop_table
, ptblsize
,
6471 internal_relocs
, sec
->reloc_count
);
6472 ebb
->start_offset
= r_offset
+ simplify_size
;
6473 ebb
->end_offset
= r_offset
+ simplify_size
;
6474 ebb
->start_ptbl_idx
= ptbl_idx
;
6475 ebb
->end_ptbl_idx
= ptbl_idx
;
6476 ebb
->start_reloc_idx
= i
;
6477 ebb
->end_reloc_idx
= i
;
6479 /* Precompute the opcode for each relocation. */
6480 if (reloc_opcodes
== NULL
)
6481 reloc_opcodes
= build_reloc_opcodes (abfd
, sec
, contents
,
6484 if (!extend_ebb_bounds (ebb
)
6485 || !compute_ebb_proposed_actions (&ebb_table
)
6486 || !compute_ebb_actions (&ebb_table
)
6487 || !check_section_ebb_pcrels_fit (abfd
, sec
, contents
,
6488 internal_relocs
, &ebb_table
,
6490 || !check_section_ebb_reduces (&ebb_table
))
6492 /* If anything goes wrong or we get unlucky and something does
6493 not fit, with our plan because of expansion between
6494 critical branches, just convert to a NOP. */
6496 text_action_add (&relax_info
->action_list
,
6497 ta_convert_longcall
, sec
, r_offset
, 0);
6498 i
= ebb_table
.ebb
.end_reloc_idx
;
6499 free_ebb_constraint (&ebb_table
);
6503 text_action_add_proposed (&relax_info
->action_list
, &ebb_table
, sec
);
6505 /* Update the index so we do not go looking at the relocations
6506 we have already processed. */
6507 i
= ebb_table
.ebb
.end_reloc_idx
;
6508 free_ebb_constraint (&ebb_table
);
6512 if (relax_info
->action_list
.head
)
6513 print_action_list (stderr
, &relax_info
->action_list
);
6517 release_contents (sec
, contents
);
6518 release_internal_relocs (sec
, internal_relocs
);
6522 free (reloc_opcodes
);
6528 /* Do not widen an instruction if it is preceeded by a
6529 loop opcode. It might cause misalignment. */
6532 prev_instr_is_a_loop (bfd_byte
*contents
,
6533 bfd_size_type content_length
,
6534 bfd_size_type offset
)
6536 xtensa_opcode prev_opcode
;
6540 prev_opcode
= insn_decode_opcode (contents
, content_length
, offset
-3, 0);
6541 return (xtensa_opcode_is_loop (xtensa_default_isa
, prev_opcode
) == 1);
6545 /* Find all of the possible actions for an extended basic block. */
6548 compute_ebb_proposed_actions (ebb_constraint
*ebb_table
)
6550 const ebb_t
*ebb
= &ebb_table
->ebb
;
6551 unsigned rel_idx
= ebb
->start_reloc_idx
;
6552 property_table_entry
*entry
, *start_entry
, *end_entry
;
6554 xtensa_isa isa
= xtensa_default_isa
;
6556 static xtensa_insnbuf insnbuf
= NULL
;
6557 static xtensa_insnbuf slotbuf
= NULL
;
6559 if (insnbuf
== NULL
)
6561 insnbuf
= xtensa_insnbuf_alloc (isa
);
6562 slotbuf
= xtensa_insnbuf_alloc (isa
);
6565 start_entry
= &ebb
->ptbl
[ebb
->start_ptbl_idx
];
6566 end_entry
= &ebb
->ptbl
[ebb
->end_ptbl_idx
];
6568 for (entry
= start_entry
; entry
<= end_entry
; entry
++)
6570 bfd_vma start_offset
, end_offset
;
6571 bfd_size_type insn_len
;
6573 start_offset
= entry
->address
- ebb
->sec
->vma
;
6574 end_offset
= entry
->address
+ entry
->size
- ebb
->sec
->vma
;
6576 if (entry
== start_entry
)
6577 start_offset
= ebb
->start_offset
;
6578 if (entry
== end_entry
)
6579 end_offset
= ebb
->end_offset
;
6580 offset
= start_offset
;
6582 if (offset
== entry
->address
- ebb
->sec
->vma
6583 && (entry
->flags
& XTENSA_PROP_INSN_BRANCH_TARGET
) != 0)
6585 enum ebb_target_enum align_type
= EBB_DESIRE_TGT_ALIGN
;
6586 BFD_ASSERT (offset
!= end_offset
);
6587 if (offset
== end_offset
)
6590 insn_len
= insn_decode_len (ebb
->contents
, ebb
->content_length
,
6595 if (check_branch_target_aligned_address (offset
, insn_len
))
6596 align_type
= EBB_REQUIRE_TGT_ALIGN
;
6598 ebb_propose_action (ebb_table
, align_type
, 0,
6599 ta_none
, offset
, 0, TRUE
);
6602 while (offset
!= end_offset
)
6604 Elf_Internal_Rela
*irel
;
6605 xtensa_opcode opcode
;
6607 while (rel_idx
< ebb
->end_reloc_idx
6608 && (ebb
->relocs
[rel_idx
].r_offset
< offset
6609 || (ebb
->relocs
[rel_idx
].r_offset
== offset
6610 && (ELF32_R_TYPE (ebb
->relocs
[rel_idx
].r_info
)
6611 != R_XTENSA_ASM_SIMPLIFY
))))
6614 /* Check for longcall. */
6615 irel
= &ebb
->relocs
[rel_idx
];
6616 if (irel
->r_offset
== offset
6617 && ELF32_R_TYPE (irel
->r_info
) == R_XTENSA_ASM_SIMPLIFY
)
6619 bfd_size_type simplify_size
;
6621 simplify_size
= get_asm_simplify_size (ebb
->contents
,
6622 ebb
->content_length
,
6624 if (simplify_size
== 0)
6627 ebb_propose_action (ebb_table
, EBB_NO_ALIGN
, 0,
6628 ta_convert_longcall
, offset
, 0, TRUE
);
6630 offset
+= simplify_size
;
6634 if (offset
+ MIN_INSN_LENGTH
> ebb
->content_length
)
6636 xtensa_insnbuf_from_chars (isa
, insnbuf
, &ebb
->contents
[offset
],
6637 ebb
->content_length
- offset
);
6638 fmt
= xtensa_format_decode (isa
, insnbuf
);
6639 if (fmt
== XTENSA_UNDEFINED
)
6641 insn_len
= xtensa_format_length (isa
, fmt
);
6642 if (insn_len
== (bfd_size_type
) XTENSA_UNDEFINED
)
6645 if (xtensa_format_num_slots (isa
, fmt
) != 1)
6651 xtensa_format_get_slot (isa
, fmt
, 0, insnbuf
, slotbuf
);
6652 opcode
= xtensa_opcode_decode (isa
, fmt
, 0, slotbuf
);
6653 if (opcode
== XTENSA_UNDEFINED
)
6656 if ((entry
->flags
& XTENSA_PROP_INSN_NO_DENSITY
) == 0
6657 && (entry
->flags
& XTENSA_PROP_INSN_NO_TRANSFORM
) == 0
6658 && can_narrow_instruction (slotbuf
, fmt
, opcode
) != 0)
6660 /* Add an instruction narrow action. */
6661 ebb_propose_action (ebb_table
, EBB_NO_ALIGN
, 0,
6662 ta_narrow_insn
, offset
, 0, FALSE
);
6664 else if ((entry
->flags
& XTENSA_PROP_INSN_NO_TRANSFORM
) == 0
6665 && can_widen_instruction (slotbuf
, fmt
, opcode
) != 0
6666 && ! prev_instr_is_a_loop (ebb
->contents
,
6667 ebb
->content_length
, offset
))
6669 /* Add an instruction widen action. */
6670 ebb_propose_action (ebb_table
, EBB_NO_ALIGN
, 0,
6671 ta_widen_insn
, offset
, 0, FALSE
);
6673 else if (xtensa_opcode_is_loop (xtensa_default_isa
, opcode
) == 1)
6675 /* Check for branch targets. */
6676 ebb_propose_action (ebb_table
, EBB_REQUIRE_LOOP_ALIGN
, 0,
6677 ta_none
, offset
, 0, TRUE
);
6684 if (ebb
->ends_unreachable
)
6686 ebb_propose_action (ebb_table
, EBB_NO_ALIGN
, 0,
6687 ta_fill
, ebb
->end_offset
, 0, TRUE
);
6693 (*_bfd_error_handler
)
6694 (_("%B(%A+0x%lx): could not decode instruction; possible configuration mismatch"),
6695 ebb
->sec
->owner
, ebb
->sec
, offset
);
6700 /* After all of the information has collected about the
6701 transformations possible in an EBB, compute the appropriate actions
6702 here in compute_ebb_actions. We still must check later to make
6703 sure that the actions do not break any relocations. The algorithm
6704 used here is pretty greedy. Basically, it removes as many no-ops
6705 as possible so that the end of the EBB has the same alignment
6706 characteristics as the original. First, it uses narrowing, then
6707 fill space at the end of the EBB, and finally widenings. If that
6708 does not work, it tries again with one fewer no-op removed. The
6709 optimization will only be performed if all of the branch targets
6710 that were aligned before transformation are also aligned after the
6713 When the size_opt flag is set, ignore the branch target alignments,
6714 narrow all wide instructions, and remove all no-ops unless the end
6715 of the EBB prevents it. */
6718 compute_ebb_actions (ebb_constraint
*ebb_table
)
6722 int removed_bytes
= 0;
6723 ebb_t
*ebb
= &ebb_table
->ebb
;
6724 unsigned seg_idx_start
= 0;
6725 unsigned seg_idx_end
= 0;
6727 /* We perform this like the assembler relaxation algorithm: Start by
6728 assuming all instructions are narrow and all no-ops removed; then
6731 /* For each segment of this that has a solid constraint, check to
6732 see if there are any combinations that will keep the constraint.
6734 for (seg_idx_end
= 0; seg_idx_end
< ebb_table
->action_count
; seg_idx_end
++)
6736 bfd_boolean requires_text_end_align
= FALSE
;
6737 unsigned longcall_count
= 0;
6738 unsigned longcall_convert_count
= 0;
6739 unsigned narrowable_count
= 0;
6740 unsigned narrowable_convert_count
= 0;
6741 unsigned widenable_count
= 0;
6742 unsigned widenable_convert_count
= 0;
6744 proposed_action
*action
= NULL
;
6745 int align
= (1 << ebb_table
->ebb
.sec
->alignment_power
);
6747 seg_idx_start
= seg_idx_end
;
6749 for (i
= seg_idx_start
; i
< ebb_table
->action_count
; i
++)
6751 action
= &ebb_table
->actions
[i
];
6752 if (action
->action
== ta_convert_longcall
)
6754 if (action
->action
== ta_narrow_insn
)
6756 if (action
->action
== ta_widen_insn
)
6758 if (action
->action
== ta_fill
)
6760 if (action
->align_type
== EBB_REQUIRE_LOOP_ALIGN
)
6762 if (action
->align_type
== EBB_REQUIRE_TGT_ALIGN
6763 && !elf32xtensa_size_opt
)
6768 if (seg_idx_end
== ebb_table
->action_count
&& !ebb
->ends_unreachable
)
6769 requires_text_end_align
= TRUE
;
6771 if (elf32xtensa_size_opt
&& !requires_text_end_align
6772 && action
->align_type
!= EBB_REQUIRE_LOOP_ALIGN
6773 && action
->align_type
!= EBB_REQUIRE_TGT_ALIGN
)
6775 longcall_convert_count
= longcall_count
;
6776 narrowable_convert_count
= narrowable_count
;
6777 widenable_convert_count
= 0;
6781 /* There is a constraint. Convert the max number of longcalls. */
6782 narrowable_convert_count
= 0;
6783 longcall_convert_count
= 0;
6784 widenable_convert_count
= 0;
6786 for (j
= 0; j
< longcall_count
; j
++)
6788 int removed
= (longcall_count
- j
) * 3 & (align
- 1);
6789 unsigned desire_narrow
= (align
- removed
) & (align
- 1);
6790 unsigned desire_widen
= removed
;
6791 if (desire_narrow
<= narrowable_count
)
6793 narrowable_convert_count
= desire_narrow
;
6794 narrowable_convert_count
+=
6795 (align
* ((narrowable_count
- narrowable_convert_count
)
6797 longcall_convert_count
= (longcall_count
- j
);
6798 widenable_convert_count
= 0;
6801 if (desire_widen
<= widenable_count
&& !elf32xtensa_size_opt
)
6803 narrowable_convert_count
= 0;
6804 longcall_convert_count
= longcall_count
- j
;
6805 widenable_convert_count
= desire_widen
;
6811 /* Now the number of conversions are saved. Do them. */
6812 for (i
= seg_idx_start
; i
< seg_idx_end
; i
++)
6814 action
= &ebb_table
->actions
[i
];
6815 switch (action
->action
)
6817 case ta_convert_longcall
:
6818 if (longcall_convert_count
!= 0)
6820 action
->action
= ta_remove_longcall
;
6821 action
->do_action
= TRUE
;
6822 action
->removed_bytes
+= 3;
6823 longcall_convert_count
--;
6826 case ta_narrow_insn
:
6827 if (narrowable_convert_count
!= 0)
6829 action
->do_action
= TRUE
;
6830 action
->removed_bytes
+= 1;
6831 narrowable_convert_count
--;
6835 if (widenable_convert_count
!= 0)
6837 action
->do_action
= TRUE
;
6838 action
->removed_bytes
-= 1;
6839 widenable_convert_count
--;
6848 /* Now we move on to some local opts. Try to remove each of the
6849 remaining longcalls. */
6851 if (ebb_table
->ebb
.ends_section
|| ebb_table
->ebb
.ends_unreachable
)
6854 for (i
= 0; i
< ebb_table
->action_count
; i
++)
6856 int old_removed_bytes
= removed_bytes
;
6857 proposed_action
*action
= &ebb_table
->actions
[i
];
6859 if (action
->do_action
&& action
->action
== ta_convert_longcall
)
6861 bfd_boolean bad_alignment
= FALSE
;
6863 for (j
= i
+ 1; j
< ebb_table
->action_count
; j
++)
6865 proposed_action
*new_action
= &ebb_table
->actions
[j
];
6866 bfd_vma offset
= new_action
->offset
;
6867 if (new_action
->align_type
== EBB_REQUIRE_TGT_ALIGN
)
6869 if (!check_branch_target_aligned
6870 (ebb_table
->ebb
.contents
,
6871 ebb_table
->ebb
.content_length
,
6872 offset
, offset
- removed_bytes
))
6874 bad_alignment
= TRUE
;
6878 if (new_action
->align_type
== EBB_REQUIRE_LOOP_ALIGN
)
6880 if (!check_loop_aligned (ebb_table
->ebb
.contents
,
6881 ebb_table
->ebb
.content_length
,
6883 offset
- removed_bytes
))
6885 bad_alignment
= TRUE
;
6889 if (new_action
->action
== ta_narrow_insn
6890 && !new_action
->do_action
6891 && ebb_table
->ebb
.sec
->alignment_power
== 2)
6893 /* Narrow an instruction and we are done. */
6894 new_action
->do_action
= TRUE
;
6895 new_action
->removed_bytes
+= 1;
6896 bad_alignment
= FALSE
;
6899 if (new_action
->action
== ta_widen_insn
6900 && new_action
->do_action
6901 && ebb_table
->ebb
.sec
->alignment_power
== 2)
6903 /* Narrow an instruction and we are done. */
6904 new_action
->do_action
= FALSE
;
6905 new_action
->removed_bytes
+= 1;
6906 bad_alignment
= FALSE
;
6912 action
->removed_bytes
+= 3;
6913 action
->action
= ta_remove_longcall
;
6914 action
->do_action
= TRUE
;
6917 removed_bytes
= old_removed_bytes
;
6918 if (action
->do_action
)
6919 removed_bytes
+= action
->removed_bytes
;
6924 for (i
= 0; i
< ebb_table
->action_count
; ++i
)
6926 proposed_action
*action
= &ebb_table
->actions
[i
];
6927 if (action
->do_action
)
6928 removed_bytes
+= action
->removed_bytes
;
6931 if ((removed_bytes
% (1 << ebb_table
->ebb
.sec
->alignment_power
)) != 0
6932 && ebb
->ends_unreachable
)
6934 proposed_action
*action
;
6938 BFD_ASSERT (ebb_table
->action_count
!= 0);
6939 action
= &ebb_table
->actions
[ebb_table
->action_count
- 1];
6940 BFD_ASSERT (action
->action
== ta_fill
);
6941 BFD_ASSERT (ebb
->ends_unreachable
->flags
& XTENSA_PROP_UNREACHABLE
);
6943 extra_space
= compute_fill_extra_space (ebb
->ends_unreachable
);
6944 br
= action
->removed_bytes
+ removed_bytes
+ extra_space
;
6945 br
= br
& ((1 << ebb
->sec
->alignment_power
) - 1);
6947 action
->removed_bytes
= extra_space
- br
;
6953 /* The xlate_map is a sorted array of address mappings designed to
6954 answer the offset_with_removed_text() query with a binary search instead
6955 of a linear search through the section's action_list. */
6957 typedef struct xlate_map_entry xlate_map_entry_t
;
6958 typedef struct xlate_map xlate_map_t
;
6960 struct xlate_map_entry
6962 unsigned orig_address
;
6963 unsigned new_address
;
6969 unsigned entry_count
;
6970 xlate_map_entry_t
*entry
;
6975 xlate_compare (const void *a_v
, const void *b_v
)
6977 const xlate_map_entry_t
*a
= (const xlate_map_entry_t
*) a_v
;
6978 const xlate_map_entry_t
*b
= (const xlate_map_entry_t
*) b_v
;
6979 if (a
->orig_address
< b
->orig_address
)
6981 if (a
->orig_address
> (b
->orig_address
+ b
->size
- 1))
6988 xlate_offset_with_removed_text (const xlate_map_t
*map
,
6989 text_action_list
*action_list
,
6992 xlate_map_entry_t tmp
;
6994 xlate_map_entry_t
*e
;
6997 return offset_with_removed_text (action_list
, offset
);
6999 if (map
->entry_count
== 0)
7002 tmp
.orig_address
= offset
;
7003 tmp
.new_address
= offset
;
7006 r
= bsearch (&offset
, map
->entry
, map
->entry_count
,
7007 sizeof (xlate_map_entry_t
), &xlate_compare
);
7008 e
= (xlate_map_entry_t
*) r
;
7010 BFD_ASSERT (e
!= NULL
);
7013 return e
->new_address
- e
->orig_address
+ offset
;
7017 /* Build a binary searchable offset translation map from a section's
7020 static xlate_map_t
*
7021 build_xlate_map (asection
*sec
, xtensa_relax_info
*relax_info
)
7023 xlate_map_t
*map
= (xlate_map_t
*) bfd_malloc (sizeof (xlate_map_t
));
7024 text_action_list
*action_list
= &relax_info
->action_list
;
7025 unsigned num_actions
= 0;
7028 xlate_map_entry_t
*current_entry
;
7033 num_actions
= action_list_count (action_list
);
7034 map
->entry
= (xlate_map_entry_t
*)
7035 bfd_malloc (sizeof (xlate_map_entry_t
) * (num_actions
+ 1));
7036 if (map
->entry
== NULL
)
7041 map
->entry_count
= 0;
7044 current_entry
= &map
->entry
[0];
7046 current_entry
->orig_address
= 0;
7047 current_entry
->new_address
= 0;
7048 current_entry
->size
= 0;
7050 for (r
= action_list
->head
; r
!= NULL
; r
= r
->next
)
7052 unsigned orig_size
= 0;
7056 case ta_remove_insn
:
7057 case ta_convert_longcall
:
7058 case ta_remove_literal
:
7059 case ta_add_literal
:
7061 case ta_remove_longcall
:
7064 case ta_narrow_insn
:
7073 current_entry
->size
=
7074 r
->offset
+ orig_size
- current_entry
->orig_address
;
7075 if (current_entry
->size
!= 0)
7080 current_entry
->orig_address
= r
->offset
+ orig_size
;
7081 removed
+= r
->removed_bytes
;
7082 current_entry
->new_address
= r
->offset
+ orig_size
- removed
;
7083 current_entry
->size
= 0;
7086 current_entry
->size
= (bfd_get_section_limit (sec
->owner
, sec
)
7087 - current_entry
->orig_address
);
7088 if (current_entry
->size
!= 0)
7095 /* Free an offset translation map. */
7098 free_xlate_map (xlate_map_t
*map
)
7100 if (map
&& map
->entry
)
7107 /* Use check_section_ebb_pcrels_fit to make sure that all of the
7108 relocations in a section will fit if a proposed set of actions
7112 check_section_ebb_pcrels_fit (bfd
*abfd
,
7115 Elf_Internal_Rela
*internal_relocs
,
7116 const ebb_constraint
*constraint
,
7117 const xtensa_opcode
*reloc_opcodes
)
7120 Elf_Internal_Rela
*irel
;
7121 xlate_map_t
*xmap
= NULL
;
7122 bfd_boolean ok
= TRUE
;
7123 xtensa_relax_info
*relax_info
;
7125 relax_info
= get_xtensa_relax_info (sec
);
7127 if (relax_info
&& sec
->reloc_count
> 100)
7129 xmap
= build_xlate_map (sec
, relax_info
);
7130 /* NULL indicates out of memory, but the slow version
7131 can still be used. */
7134 for (i
= 0; i
< sec
->reloc_count
; i
++)
7137 bfd_vma orig_self_offset
, orig_target_offset
;
7138 bfd_vma self_offset
, target_offset
;
7140 reloc_howto_type
*howto
;
7141 int self_removed_bytes
, target_removed_bytes
;
7143 irel
= &internal_relocs
[i
];
7144 r_type
= ELF32_R_TYPE (irel
->r_info
);
7146 howto
= &elf_howto_table
[r_type
];
7147 /* We maintain the required invariant: PC-relative relocations
7148 that fit before linking must fit after linking. Thus we only
7149 need to deal with relocations to the same section that are
7151 if (ELF32_R_TYPE (irel
->r_info
) == R_XTENSA_ASM_SIMPLIFY
7152 || !howto
->pc_relative
)
7155 r_reloc_init (&r_rel
, abfd
, irel
, contents
,
7156 bfd_get_section_limit (abfd
, sec
));
7158 if (r_reloc_get_section (&r_rel
) != sec
)
7161 orig_self_offset
= irel
->r_offset
;
7162 orig_target_offset
= r_rel
.target_offset
;
7164 self_offset
= orig_self_offset
;
7165 target_offset
= orig_target_offset
;
7170 xlate_offset_with_removed_text (xmap
, &relax_info
->action_list
,
7173 xlate_offset_with_removed_text (xmap
, &relax_info
->action_list
,
7174 orig_target_offset
);
7177 self_removed_bytes
= 0;
7178 target_removed_bytes
= 0;
7180 for (j
= 0; j
< constraint
->action_count
; ++j
)
7182 proposed_action
*action
= &constraint
->actions
[j
];
7183 bfd_vma offset
= action
->offset
;
7184 int removed_bytes
= action
->removed_bytes
;
7185 if (offset
< orig_self_offset
7186 || (offset
== orig_self_offset
&& action
->action
== ta_fill
7187 && action
->removed_bytes
< 0))
7188 self_removed_bytes
+= removed_bytes
;
7189 if (offset
< orig_target_offset
7190 || (offset
== orig_target_offset
&& action
->action
== ta_fill
7191 && action
->removed_bytes
< 0))
7192 target_removed_bytes
+= removed_bytes
;
7194 self_offset
-= self_removed_bytes
;
7195 target_offset
-= target_removed_bytes
;
7197 /* Try to encode it. Get the operand and check. */
7198 if (is_alt_relocation (ELF32_R_TYPE (irel
->r_info
)))
7200 /* None of the current alternate relocs are PC-relative,
7201 and only PC-relative relocs matter here. */
7205 xtensa_opcode opcode
;
7209 opcode
= reloc_opcodes
[i
];
7211 opcode
= get_relocation_opcode (abfd
, sec
, contents
, irel
);
7212 if (opcode
== XTENSA_UNDEFINED
)
7218 opnum
= get_relocation_opnd (opcode
, ELF32_R_TYPE (irel
->r_info
));
7219 if (opnum
== XTENSA_UNDEFINED
)
7225 if (!pcrel_reloc_fits (opcode
, opnum
, self_offset
, target_offset
))
7234 free_xlate_map (xmap
);
7241 check_section_ebb_reduces (const ebb_constraint
*constraint
)
7246 for (i
= 0; i
< constraint
->action_count
; i
++)
7248 const proposed_action
*action
= &constraint
->actions
[i
];
7249 if (action
->do_action
)
7250 removed
+= action
->removed_bytes
;
7260 text_action_add_proposed (text_action_list
*l
,
7261 const ebb_constraint
*ebb_table
,
7266 for (i
= 0; i
< ebb_table
->action_count
; i
++)
7268 proposed_action
*action
= &ebb_table
->actions
[i
];
7270 if (!action
->do_action
)
7272 switch (action
->action
)
7274 case ta_remove_insn
:
7275 case ta_remove_longcall
:
7276 case ta_convert_longcall
:
7277 case ta_narrow_insn
:
7280 case ta_remove_literal
:
7281 text_action_add (l
, action
->action
, sec
, action
->offset
,
7282 action
->removed_bytes
);
7295 compute_fill_extra_space (property_table_entry
*entry
)
7297 int fill_extra_space
;
7302 if ((entry
->flags
& XTENSA_PROP_UNREACHABLE
) == 0)
7305 fill_extra_space
= entry
->size
;
7306 if ((entry
->flags
& XTENSA_PROP_ALIGN
) != 0)
7308 /* Fill bytes for alignment:
7309 (2**n)-1 - (addr + (2**n)-1) & (2**n -1) */
7310 int pow
= GET_XTENSA_PROP_ALIGNMENT (entry
->flags
);
7311 int nsm
= (1 << pow
) - 1;
7312 bfd_vma addr
= entry
->address
+ entry
->size
;
7313 bfd_vma align_fill
= nsm
- ((addr
+ nsm
) & nsm
);
7314 fill_extra_space
+= align_fill
;
7316 return fill_extra_space
;
7320 /* First relaxation pass. */
7322 /* If the section contains relaxable literals, check each literal to
7323 see if it has the same value as another literal that has already
7324 been seen, either in the current section or a previous one. If so,
7325 add an entry to the per-section list of removed literals. The
7326 actual changes are deferred until the next pass. */
7329 compute_removed_literals (bfd
*abfd
,
7331 struct bfd_link_info
*link_info
,
7332 value_map_hash_table
*values
)
7334 xtensa_relax_info
*relax_info
;
7336 Elf_Internal_Rela
*internal_relocs
;
7337 source_reloc
*src_relocs
, *rel
;
7338 bfd_boolean ok
= TRUE
;
7339 property_table_entry
*prop_table
= NULL
;
7342 bfd_boolean last_loc_is_prev
= FALSE
;
7343 bfd_vma last_target_offset
= 0;
7344 section_cache_t target_sec_cache
;
7345 bfd_size_type sec_size
;
7347 init_section_cache (&target_sec_cache
);
7349 /* Do nothing if it is not a relaxable literal section. */
7350 relax_info
= get_xtensa_relax_info (sec
);
7351 BFD_ASSERT (relax_info
);
7352 if (!relax_info
->is_relaxable_literal_section
)
7355 internal_relocs
= retrieve_internal_relocs (abfd
, sec
,
7356 link_info
->keep_memory
);
7358 sec_size
= bfd_get_section_limit (abfd
, sec
);
7359 contents
= retrieve_contents (abfd
, sec
, link_info
->keep_memory
);
7360 if (contents
== NULL
&& sec_size
!= 0)
7366 /* Sort the source_relocs by target offset. */
7367 src_relocs
= relax_info
->src_relocs
;
7368 qsort (src_relocs
, relax_info
->src_count
,
7369 sizeof (source_reloc
), source_reloc_compare
);
7370 qsort (internal_relocs
, sec
->reloc_count
, sizeof (Elf_Internal_Rela
),
7371 internal_reloc_compare
);
7373 ptblsize
= xtensa_read_table_entries (abfd
, sec
, &prop_table
,
7374 XTENSA_PROP_SEC_NAME
, FALSE
);
7382 for (i
= 0; i
< relax_info
->src_count
; i
++)
7384 Elf_Internal_Rela
*irel
= NULL
;
7386 rel
= &src_relocs
[i
];
7387 if (get_l32r_opcode () != rel
->opcode
)
7389 irel
= get_irel_at_offset (sec
, internal_relocs
,
7390 rel
->r_rel
.target_offset
);
7392 /* If the relocation on this is not a simple R_XTENSA_32 or
7393 R_XTENSA_PLT then do not consider it. This may happen when
7394 the difference of two symbols is used in a literal. */
7395 if (irel
&& (ELF32_R_TYPE (irel
->r_info
) != R_XTENSA_32
7396 && ELF32_R_TYPE (irel
->r_info
) != R_XTENSA_PLT
))
7399 /* If the target_offset for this relocation is the same as the
7400 previous relocation, then we've already considered whether the
7401 literal can be coalesced. Skip to the next one.... */
7402 if (i
!= 0 && prev_i
!= -1
7403 && src_relocs
[i
-1].r_rel
.target_offset
== rel
->r_rel
.target_offset
)
7407 if (last_loc_is_prev
&&
7408 last_target_offset
+ 4 != rel
->r_rel
.target_offset
)
7409 last_loc_is_prev
= FALSE
;
7411 /* Check if the relocation was from an L32R that is being removed
7412 because a CALLX was converted to a direct CALL, and check if
7413 there are no other relocations to the literal. */
7414 if (is_removable_literal (rel
, i
, src_relocs
, relax_info
->src_count
))
7416 if (!remove_dead_literal (abfd
, sec
, link_info
, internal_relocs
,
7417 irel
, rel
, prop_table
, ptblsize
))
7422 last_target_offset
= rel
->r_rel
.target_offset
;
7426 if (!identify_literal_placement (abfd
, sec
, contents
, link_info
,
7428 &last_loc_is_prev
, irel
,
7429 relax_info
->src_count
- i
, rel
,
7430 prop_table
, ptblsize
,
7431 &target_sec_cache
, rel
->is_abs_literal
))
7436 last_target_offset
= rel
->r_rel
.target_offset
;
7440 print_removed_literals (stderr
, &relax_info
->removed_list
);
7441 print_action_list (stderr
, &relax_info
->action_list
);
7445 if (prop_table
) free (prop_table
);
7446 clear_section_cache (&target_sec_cache
);
7448 release_contents (sec
, contents
);
7449 release_internal_relocs (sec
, internal_relocs
);
7454 static Elf_Internal_Rela
*
7455 get_irel_at_offset (asection
*sec
,
7456 Elf_Internal_Rela
*internal_relocs
,
7460 Elf_Internal_Rela
*irel
;
7462 Elf_Internal_Rela key
;
7464 if (!internal_relocs
)
7467 key
.r_offset
= offset
;
7468 irel
= bsearch (&key
, internal_relocs
, sec
->reloc_count
,
7469 sizeof (Elf_Internal_Rela
), internal_reloc_matches
);
7473 /* bsearch does not guarantee which will be returned if there are
7474 multiple matches. We need the first that is not an alignment. */
7475 i
= irel
- internal_relocs
;
7478 if (internal_relocs
[i
-1].r_offset
!= offset
)
7482 for ( ; i
< sec
->reloc_count
; i
++)
7484 irel
= &internal_relocs
[i
];
7485 r_type
= ELF32_R_TYPE (irel
->r_info
);
7486 if (irel
->r_offset
== offset
&& r_type
!= R_XTENSA_NONE
)
7495 is_removable_literal (const source_reloc
*rel
,
7497 const source_reloc
*src_relocs
,
7500 const source_reloc
*curr_rel
;
7504 for (++i
; i
< src_count
; ++i
)
7506 curr_rel
= &src_relocs
[i
];
7507 /* If all others have the same target offset.... */
7508 if (curr_rel
->r_rel
.target_offset
!= rel
->r_rel
.target_offset
)
7511 if (!curr_rel
->is_null
7512 && !xtensa_is_property_section (curr_rel
->source_sec
)
7513 && !(curr_rel
->source_sec
->flags
& SEC_DEBUGGING
))
7521 remove_dead_literal (bfd
*abfd
,
7523 struct bfd_link_info
*link_info
,
7524 Elf_Internal_Rela
*internal_relocs
,
7525 Elf_Internal_Rela
*irel
,
7527 property_table_entry
*prop_table
,
7530 property_table_entry
*entry
;
7531 xtensa_relax_info
*relax_info
;
7533 relax_info
= get_xtensa_relax_info (sec
);
7537 entry
= elf_xtensa_find_property_entry (prop_table
, ptblsize
,
7538 sec
->vma
+ rel
->r_rel
.target_offset
);
7540 /* Mark the unused literal so that it will be removed. */
7541 add_removed_literal (&relax_info
->removed_list
, &rel
->r_rel
, NULL
);
7543 text_action_add (&relax_info
->action_list
,
7544 ta_remove_literal
, sec
, rel
->r_rel
.target_offset
, 4);
7546 /* If the section is 4-byte aligned, do not add fill. */
7547 if (sec
->alignment_power
> 2)
7549 int fill_extra_space
;
7550 bfd_vma entry_sec_offset
;
7552 property_table_entry
*the_add_entry
;
7556 entry_sec_offset
= entry
->address
- sec
->vma
+ entry
->size
;
7558 entry_sec_offset
= rel
->r_rel
.target_offset
+ 4;
7560 /* If the literal range is at the end of the section,
7562 the_add_entry
= elf_xtensa_find_property_entry (prop_table
, ptblsize
,
7564 fill_extra_space
= compute_fill_extra_space (the_add_entry
);
7566 fa
= find_fill_action (&relax_info
->action_list
, sec
, entry_sec_offset
);
7567 removed_diff
= compute_removed_action_diff (fa
, sec
, entry_sec_offset
,
7568 -4, fill_extra_space
);
7570 adjust_fill_action (fa
, removed_diff
);
7572 text_action_add (&relax_info
->action_list
,
7573 ta_fill
, sec
, entry_sec_offset
, removed_diff
);
7576 /* Zero out the relocation on this literal location. */
7579 if (elf_hash_table (link_info
)->dynamic_sections_created
)
7580 shrink_dynamic_reloc_sections (link_info
, abfd
, sec
, irel
);
7582 irel
->r_info
= ELF32_R_INFO (0, R_XTENSA_NONE
);
7583 pin_internal_relocs (sec
, internal_relocs
);
7586 /* Do not modify "last_loc_is_prev". */
7592 identify_literal_placement (bfd
*abfd
,
7595 struct bfd_link_info
*link_info
,
7596 value_map_hash_table
*values
,
7597 bfd_boolean
*last_loc_is_prev_p
,
7598 Elf_Internal_Rela
*irel
,
7599 int remaining_src_rels
,
7601 property_table_entry
*prop_table
,
7603 section_cache_t
*target_sec_cache
,
7604 bfd_boolean is_abs_literal
)
7608 xtensa_relax_info
*relax_info
;
7609 bfd_boolean literal_placed
= FALSE
;
7611 unsigned long value
;
7612 bfd_boolean final_static_link
;
7613 bfd_size_type sec_size
;
7615 relax_info
= get_xtensa_relax_info (sec
);
7619 sec_size
= bfd_get_section_limit (abfd
, sec
);
7622 (!link_info
->relocatable
7623 && !elf_hash_table (link_info
)->dynamic_sections_created
);
7625 /* The placement algorithm first checks to see if the literal is
7626 already in the value map. If so and the value map is reachable
7627 from all uses, then the literal is moved to that location. If
7628 not, then we identify the last location where a fresh literal was
7629 placed. If the literal can be safely moved there, then we do so.
7630 If not, then we assume that the literal is not to move and leave
7631 the literal where it is, marking it as the last literal
7634 /* Find the literal value. */
7636 r_reloc_init (&r_rel
, abfd
, irel
, contents
, sec_size
);
7639 BFD_ASSERT (rel
->r_rel
.target_offset
< sec_size
);
7640 value
= bfd_get_32 (abfd
, contents
+ rel
->r_rel
.target_offset
);
7642 init_literal_value (&val
, &r_rel
, value
, is_abs_literal
);
7644 /* Check if we've seen another literal with the same value that
7645 is in the same output section. */
7646 val_map
= value_map_get_cached_value (values
, &val
, final_static_link
);
7649 && (r_reloc_get_section (&val_map
->loc
)->output_section
7650 == sec
->output_section
)
7651 && relocations_reach (rel
, remaining_src_rels
, &val_map
->loc
)
7652 && coalesce_shared_literal (sec
, rel
, prop_table
, ptblsize
, val_map
))
7654 /* No change to last_loc_is_prev. */
7655 literal_placed
= TRUE
;
7658 /* For relocatable links, do not try to move literals. To do it
7659 correctly might increase the number of relocations in an input
7660 section making the default relocatable linking fail. */
7661 if (!link_info
->relocatable
&& !literal_placed
7662 && values
->has_last_loc
&& !(*last_loc_is_prev_p
))
7664 asection
*target_sec
= r_reloc_get_section (&values
->last_loc
);
7665 if (target_sec
&& target_sec
->output_section
== sec
->output_section
)
7667 /* Increment the virtual offset. */
7668 r_reloc try_loc
= values
->last_loc
;
7669 try_loc
.virtual_offset
+= 4;
7671 /* There is a last loc that was in the same output section. */
7672 if (relocations_reach (rel
, remaining_src_rels
, &try_loc
)
7673 && move_shared_literal (sec
, link_info
, rel
,
7674 prop_table
, ptblsize
,
7675 &try_loc
, &val
, target_sec_cache
))
7677 values
->last_loc
.virtual_offset
+= 4;
7678 literal_placed
= TRUE
;
7680 val_map
= add_value_map (values
, &val
, &try_loc
,
7683 val_map
->loc
= try_loc
;
7688 if (!literal_placed
)
7690 /* Nothing worked, leave the literal alone but update the last loc. */
7691 values
->has_last_loc
= TRUE
;
7692 values
->last_loc
= rel
->r_rel
;
7694 val_map
= add_value_map (values
, &val
, &rel
->r_rel
, final_static_link
);
7696 val_map
->loc
= rel
->r_rel
;
7697 *last_loc_is_prev_p
= TRUE
;
7704 /* Check if the original relocations (presumably on L32R instructions)
7705 identified by reloc[0..N] can be changed to reference the literal
7706 identified by r_rel. If r_rel is out of range for any of the
7707 original relocations, then we don't want to coalesce the original
7708 literal with the one at r_rel. We only check reloc[0..N], where the
7709 offsets are all the same as for reloc[0] (i.e., they're all
7710 referencing the same literal) and where N is also bounded by the
7711 number of remaining entries in the "reloc" array. The "reloc" array
7712 is sorted by target offset so we know all the entries for the same
7713 literal will be contiguous. */
7716 relocations_reach (source_reloc
*reloc
,
7717 int remaining_relocs
,
7718 const r_reloc
*r_rel
)
7720 bfd_vma from_offset
, source_address
, dest_address
;
7724 if (!r_reloc_is_defined (r_rel
))
7727 sec
= r_reloc_get_section (r_rel
);
7728 from_offset
= reloc
[0].r_rel
.target_offset
;
7730 for (i
= 0; i
< remaining_relocs
; i
++)
7732 if (reloc
[i
].r_rel
.target_offset
!= from_offset
)
7735 /* Ignore relocations that have been removed. */
7736 if (reloc
[i
].is_null
)
7739 /* The original and new output section for these must be the same
7740 in order to coalesce. */
7741 if (r_reloc_get_section (&reloc
[i
].r_rel
)->output_section
7742 != sec
->output_section
)
7745 /* Absolute literals in the same output section can always be
7747 if (reloc
[i
].is_abs_literal
)
7750 /* A literal with no PC-relative relocations can be moved anywhere. */
7751 if (reloc
[i
].opnd
!= -1)
7753 /* Otherwise, check to see that it fits. */
7754 source_address
= (reloc
[i
].source_sec
->output_section
->vma
7755 + reloc
[i
].source_sec
->output_offset
7756 + reloc
[i
].r_rel
.rela
.r_offset
);
7757 dest_address
= (sec
->output_section
->vma
7758 + sec
->output_offset
7759 + r_rel
->target_offset
);
7761 if (!pcrel_reloc_fits (reloc
[i
].opcode
, reloc
[i
].opnd
,
7762 source_address
, dest_address
))
7771 /* Move a literal to another literal location because it is
7772 the same as the other literal value. */
7775 coalesce_shared_literal (asection
*sec
,
7777 property_table_entry
*prop_table
,
7781 property_table_entry
*entry
;
7783 property_table_entry
*the_add_entry
;
7785 xtensa_relax_info
*relax_info
;
7787 relax_info
= get_xtensa_relax_info (sec
);
7791 entry
= elf_xtensa_find_property_entry
7792 (prop_table
, ptblsize
, sec
->vma
+ rel
->r_rel
.target_offset
);
7793 if (entry
&& (entry
->flags
& XTENSA_PROP_INSN_NO_TRANSFORM
))
7796 /* Mark that the literal will be coalesced. */
7797 add_removed_literal (&relax_info
->removed_list
, &rel
->r_rel
, &val_map
->loc
);
7799 text_action_add (&relax_info
->action_list
,
7800 ta_remove_literal
, sec
, rel
->r_rel
.target_offset
, 4);
7802 /* If the section is 4-byte aligned, do not add fill. */
7803 if (sec
->alignment_power
> 2)
7805 int fill_extra_space
;
7806 bfd_vma entry_sec_offset
;
7809 entry_sec_offset
= entry
->address
- sec
->vma
+ entry
->size
;
7811 entry_sec_offset
= rel
->r_rel
.target_offset
+ 4;
7813 /* If the literal range is at the end of the section,
7815 fill_extra_space
= 0;
7816 the_add_entry
= elf_xtensa_find_property_entry (prop_table
, ptblsize
,
7818 if (the_add_entry
&& (the_add_entry
->flags
& XTENSA_PROP_UNREACHABLE
))
7819 fill_extra_space
= the_add_entry
->size
;
7821 fa
= find_fill_action (&relax_info
->action_list
, sec
, entry_sec_offset
);
7822 removed_diff
= compute_removed_action_diff (fa
, sec
, entry_sec_offset
,
7823 -4, fill_extra_space
);
7825 adjust_fill_action (fa
, removed_diff
);
7827 text_action_add (&relax_info
->action_list
,
7828 ta_fill
, sec
, entry_sec_offset
, removed_diff
);
7835 /* Move a literal to another location. This may actually increase the
7836 total amount of space used because of alignments so we need to do
7837 this carefully. Also, it may make a branch go out of range. */
7840 move_shared_literal (asection
*sec
,
7841 struct bfd_link_info
*link_info
,
7843 property_table_entry
*prop_table
,
7845 const r_reloc
*target_loc
,
7846 const literal_value
*lit_value
,
7847 section_cache_t
*target_sec_cache
)
7849 property_table_entry
*the_add_entry
, *src_entry
, *target_entry
= NULL
;
7850 text_action
*fa
, *target_fa
;
7852 xtensa_relax_info
*relax_info
, *target_relax_info
;
7853 asection
*target_sec
;
7855 ebb_constraint ebb_table
;
7856 bfd_boolean relocs_fit
;
7858 /* If this routine always returns FALSE, the literals that cannot be
7859 coalesced will not be moved. */
7860 if (elf32xtensa_no_literal_movement
)
7863 relax_info
= get_xtensa_relax_info (sec
);
7867 target_sec
= r_reloc_get_section (target_loc
);
7868 target_relax_info
= get_xtensa_relax_info (target_sec
);
7870 /* Literals to undefined sections may not be moved because they
7871 must report an error. */
7872 if (bfd_is_und_section (target_sec
))
7875 src_entry
= elf_xtensa_find_property_entry
7876 (prop_table
, ptblsize
, sec
->vma
+ rel
->r_rel
.target_offset
);
7878 if (!section_cache_section (target_sec_cache
, target_sec
, link_info
))
7881 target_entry
= elf_xtensa_find_property_entry
7882 (target_sec_cache
->ptbl
, target_sec_cache
->pte_count
,
7883 target_sec
->vma
+ target_loc
->target_offset
);
7888 /* Make sure that we have not broken any branches. */
7891 init_ebb_constraint (&ebb_table
);
7892 ebb
= &ebb_table
.ebb
;
7893 init_ebb (ebb
, target_sec_cache
->sec
, target_sec_cache
->contents
,
7894 target_sec_cache
->content_length
,
7895 target_sec_cache
->ptbl
, target_sec_cache
->pte_count
,
7896 target_sec_cache
->relocs
, target_sec_cache
->reloc_count
);
7898 /* Propose to add 4 bytes + worst-case alignment size increase to
7900 ebb_propose_action (&ebb_table
, EBB_NO_ALIGN
, 0,
7901 ta_fill
, target_loc
->target_offset
,
7902 -4 - (1 << target_sec
->alignment_power
), TRUE
);
7904 /* Check all of the PC-relative relocations to make sure they still fit. */
7905 relocs_fit
= check_section_ebb_pcrels_fit (target_sec
->owner
, target_sec
,
7906 target_sec_cache
->contents
,
7907 target_sec_cache
->relocs
,
7913 text_action_add_literal (&target_relax_info
->action_list
,
7914 ta_add_literal
, target_loc
, lit_value
, -4);
7916 if (target_sec
->alignment_power
> 2 && target_entry
!= src_entry
)
7918 /* May need to add or remove some fill to maintain alignment. */
7919 int fill_extra_space
;
7920 bfd_vma entry_sec_offset
;
7923 target_entry
->address
- target_sec
->vma
+ target_entry
->size
;
7925 /* If the literal range is at the end of the section,
7927 fill_extra_space
= 0;
7929 elf_xtensa_find_property_entry (target_sec_cache
->ptbl
,
7930 target_sec_cache
->pte_count
,
7932 if (the_add_entry
&& (the_add_entry
->flags
& XTENSA_PROP_UNREACHABLE
))
7933 fill_extra_space
= the_add_entry
->size
;
7935 target_fa
= find_fill_action (&target_relax_info
->action_list
,
7936 target_sec
, entry_sec_offset
);
7937 removed_diff
= compute_removed_action_diff (target_fa
, target_sec
,
7938 entry_sec_offset
, 4,
7941 adjust_fill_action (target_fa
, removed_diff
);
7943 text_action_add (&target_relax_info
->action_list
,
7944 ta_fill
, target_sec
, entry_sec_offset
, removed_diff
);
7947 /* Mark that the literal will be moved to the new location. */
7948 add_removed_literal (&relax_info
->removed_list
, &rel
->r_rel
, target_loc
);
7950 /* Remove the literal. */
7951 text_action_add (&relax_info
->action_list
,
7952 ta_remove_literal
, sec
, rel
->r_rel
.target_offset
, 4);
7954 /* If the section is 4-byte aligned, do not add fill. */
7955 if (sec
->alignment_power
> 2 && target_entry
!= src_entry
)
7957 int fill_extra_space
;
7958 bfd_vma entry_sec_offset
;
7961 entry_sec_offset
= src_entry
->address
- sec
->vma
+ src_entry
->size
;
7963 entry_sec_offset
= rel
->r_rel
.target_offset
+4;
7965 /* If the literal range is at the end of the section,
7967 fill_extra_space
= 0;
7968 the_add_entry
= elf_xtensa_find_property_entry (prop_table
, ptblsize
,
7970 if (the_add_entry
&& (the_add_entry
->flags
& XTENSA_PROP_UNREACHABLE
))
7971 fill_extra_space
= the_add_entry
->size
;
7973 fa
= find_fill_action (&relax_info
->action_list
, sec
, entry_sec_offset
);
7974 removed_diff
= compute_removed_action_diff (fa
, sec
, entry_sec_offset
,
7975 -4, fill_extra_space
);
7977 adjust_fill_action (fa
, removed_diff
);
7979 text_action_add (&relax_info
->action_list
,
7980 ta_fill
, sec
, entry_sec_offset
, removed_diff
);
7987 /* Second relaxation pass. */
7989 /* Modify all of the relocations to point to the right spot, and if this
7990 is a relaxable section, delete the unwanted literals and fix the
7994 relax_section (bfd
*abfd
, asection
*sec
, struct bfd_link_info
*link_info
)
7996 Elf_Internal_Rela
*internal_relocs
;
7997 xtensa_relax_info
*relax_info
;
7999 bfd_boolean ok
= TRUE
;
8001 bfd_boolean rv
= FALSE
;
8002 bfd_boolean virtual_action
;
8003 bfd_size_type sec_size
;
8005 sec_size
= bfd_get_section_limit (abfd
, sec
);
8006 relax_info
= get_xtensa_relax_info (sec
);
8007 BFD_ASSERT (relax_info
);
8009 /* First translate any of the fixes that have been added already. */
8010 translate_section_fixes (sec
);
8012 /* Handle property sections (e.g., literal tables) specially. */
8013 if (xtensa_is_property_section (sec
))
8015 BFD_ASSERT (!relax_info
->is_relaxable_literal_section
);
8016 return relax_property_section (abfd
, sec
, link_info
);
8019 internal_relocs
= retrieve_internal_relocs (abfd
, sec
,
8020 link_info
->keep_memory
);
8021 contents
= retrieve_contents (abfd
, sec
, link_info
->keep_memory
);
8022 if (contents
== NULL
&& sec_size
!= 0)
8028 if (internal_relocs
)
8030 for (i
= 0; i
< sec
->reloc_count
; i
++)
8032 Elf_Internal_Rela
*irel
;
8033 xtensa_relax_info
*target_relax_info
;
8034 bfd_vma source_offset
, old_source_offset
;
8037 asection
*target_sec
;
8039 /* Locally change the source address.
8040 Translate the target to the new target address.
8041 If it points to this section and has been removed,
8045 irel
= &internal_relocs
[i
];
8046 source_offset
= irel
->r_offset
;
8047 old_source_offset
= source_offset
;
8049 r_type
= ELF32_R_TYPE (irel
->r_info
);
8050 r_reloc_init (&r_rel
, abfd
, irel
, contents
,
8051 bfd_get_section_limit (abfd
, sec
));
8053 /* If this section could have changed then we may need to
8054 change the relocation's offset. */
8056 if (relax_info
->is_relaxable_literal_section
8057 || relax_info
->is_relaxable_asm_section
)
8059 if (r_type
!= R_XTENSA_NONE
8060 && find_removed_literal (&relax_info
->removed_list
,
8063 /* Remove this relocation. */
8064 if (elf_hash_table (link_info
)->dynamic_sections_created
)
8065 shrink_dynamic_reloc_sections (link_info
, abfd
, sec
, irel
);
8066 irel
->r_info
= ELF32_R_INFO (0, R_XTENSA_NONE
);
8067 irel
->r_offset
= offset_with_removed_text
8068 (&relax_info
->action_list
, irel
->r_offset
);
8069 pin_internal_relocs (sec
, internal_relocs
);
8073 if (r_type
== R_XTENSA_ASM_SIMPLIFY
)
8075 text_action
*action
=
8076 find_insn_action (&relax_info
->action_list
,
8078 if (action
&& (action
->action
== ta_convert_longcall
8079 || action
->action
== ta_remove_longcall
))
8081 bfd_reloc_status_type retval
;
8082 char *error_message
= NULL
;
8084 retval
= contract_asm_expansion (contents
, sec_size
,
8085 irel
, &error_message
);
8086 if (retval
!= bfd_reloc_ok
)
8088 (*link_info
->callbacks
->reloc_dangerous
)
8089 (link_info
, error_message
, abfd
, sec
,
8093 /* Update the action so that the code that moves
8094 the contents will do the right thing. */
8095 if (action
->action
== ta_remove_longcall
)
8096 action
->action
= ta_remove_insn
;
8098 action
->action
= ta_none
;
8099 /* Refresh the info in the r_rel. */
8100 r_reloc_init (&r_rel
, abfd
, irel
, contents
, sec_size
);
8101 r_type
= ELF32_R_TYPE (irel
->r_info
);
8105 source_offset
= offset_with_removed_text
8106 (&relax_info
->action_list
, irel
->r_offset
);
8107 irel
->r_offset
= source_offset
;
8110 /* If the target section could have changed then
8111 we may need to change the relocation's target offset. */
8113 target_sec
= r_reloc_get_section (&r_rel
);
8114 target_relax_info
= get_xtensa_relax_info (target_sec
);
8116 if (target_relax_info
8117 && (target_relax_info
->is_relaxable_literal_section
8118 || target_relax_info
->is_relaxable_asm_section
))
8122 bfd_vma addend_displacement
;
8124 translate_reloc (&r_rel
, &new_reloc
);
8126 if (r_type
== R_XTENSA_DIFF8
8127 || r_type
== R_XTENSA_DIFF16
8128 || r_type
== R_XTENSA_DIFF32
)
8130 bfd_vma diff_value
= 0, new_end_offset
, diff_mask
= 0;
8132 if (bfd_get_section_limit (abfd
, sec
) < old_source_offset
)
8134 (*link_info
->callbacks
->reloc_dangerous
)
8135 (link_info
, _("invalid relocation address"),
8136 abfd
, sec
, old_source_offset
);
8142 case R_XTENSA_DIFF8
:
8144 bfd_get_8 (abfd
, &contents
[old_source_offset
]);
8146 case R_XTENSA_DIFF16
:
8148 bfd_get_16 (abfd
, &contents
[old_source_offset
]);
8150 case R_XTENSA_DIFF32
:
8152 bfd_get_32 (abfd
, &contents
[old_source_offset
]);
8156 new_end_offset
= offset_with_removed_text
8157 (&target_relax_info
->action_list
,
8158 r_rel
.target_offset
+ diff_value
);
8159 diff_value
= new_end_offset
- new_reloc
.target_offset
;
8163 case R_XTENSA_DIFF8
:
8165 bfd_put_8 (abfd
, diff_value
,
8166 &contents
[old_source_offset
]);
8168 case R_XTENSA_DIFF16
:
8170 bfd_put_16 (abfd
, diff_value
,
8171 &contents
[old_source_offset
]);
8173 case R_XTENSA_DIFF32
:
8174 diff_mask
= 0xffffffff;
8175 bfd_put_32 (abfd
, diff_value
,
8176 &contents
[old_source_offset
]);
8180 /* Check for overflow. */
8181 if ((diff_value
& ~diff_mask
) != 0)
8183 (*link_info
->callbacks
->reloc_dangerous
)
8184 (link_info
, _("overflow after relaxation"),
8185 abfd
, sec
, old_source_offset
);
8189 pin_contents (sec
, contents
);
8192 /* FIXME: If the relocation still references a section in
8193 the same input file, the relocation should be modified
8194 directly instead of adding a "fix" record. */
8196 addend_displacement
=
8197 new_reloc
.target_offset
+ new_reloc
.virtual_offset
;
8199 fix
= reloc_bfd_fix_init (sec
, source_offset
, r_type
, 0,
8200 r_reloc_get_section (&new_reloc
),
8201 addend_displacement
, TRUE
);
8205 pin_internal_relocs (sec
, internal_relocs
);
8209 if ((relax_info
->is_relaxable_literal_section
8210 || relax_info
->is_relaxable_asm_section
)
8211 && relax_info
->action_list
.head
)
8213 /* Walk through the planned actions and build up a table
8214 of move, copy and fill records. Use the move, copy and
8215 fill records to perform the actions once. */
8217 bfd_size_type size
= sec
->size
;
8219 bfd_size_type final_size
, copy_size
, orig_insn_size
;
8220 bfd_byte
*scratch
= NULL
;
8221 bfd_byte
*dup_contents
= NULL
;
8222 bfd_size_type orig_size
= size
;
8223 bfd_vma orig_dot
= 0;
8224 bfd_vma orig_dot_copied
= 0; /* Byte copied already from
8225 orig dot in physical memory. */
8226 bfd_vma orig_dot_vo
= 0; /* Virtual offset from orig_dot. */
8227 bfd_vma dup_dot
= 0;
8229 text_action
*action
= relax_info
->action_list
.head
;
8231 final_size
= sec
->size
;
8232 for (action
= relax_info
->action_list
.head
; action
;
8233 action
= action
->next
)
8235 final_size
-= action
->removed_bytes
;
8238 scratch
= (bfd_byte
*) bfd_zmalloc (final_size
);
8239 dup_contents
= (bfd_byte
*) bfd_zmalloc (final_size
);
8241 /* The dot is the current fill location. */
8243 print_action_list (stderr
, &relax_info
->action_list
);
8246 for (action
= relax_info
->action_list
.head
; action
;
8247 action
= action
->next
)
8249 virtual_action
= FALSE
;
8250 if (action
->offset
> orig_dot
)
8252 orig_dot
+= orig_dot_copied
;
8253 orig_dot_copied
= 0;
8255 /* Out of the virtual world. */
8258 if (action
->offset
> orig_dot
)
8260 copy_size
= action
->offset
- orig_dot
;
8261 memmove (&dup_contents
[dup_dot
], &contents
[orig_dot
], copy_size
);
8262 orig_dot
+= copy_size
;
8263 dup_dot
+= copy_size
;
8264 BFD_ASSERT (action
->offset
== orig_dot
);
8266 else if (action
->offset
< orig_dot
)
8268 if (action
->action
== ta_fill
8269 && action
->offset
- action
->removed_bytes
== orig_dot
)
8271 /* This is OK because the fill only effects the dup_dot. */
8273 else if (action
->action
== ta_add_literal
)
8275 /* TBD. Might need to handle this. */
8278 if (action
->offset
== orig_dot
)
8280 if (action
->virtual_offset
> orig_dot_vo
)
8282 if (orig_dot_vo
== 0)
8284 /* Need to copy virtual_offset bytes. Probably four. */
8285 copy_size
= action
->virtual_offset
- orig_dot_vo
;
8286 memmove (&dup_contents
[dup_dot
],
8287 &contents
[orig_dot
], copy_size
);
8288 orig_dot_copied
= copy_size
;
8289 dup_dot
+= copy_size
;
8291 virtual_action
= TRUE
;
8294 BFD_ASSERT (action
->virtual_offset
<= orig_dot_vo
);
8296 switch (action
->action
)
8298 case ta_remove_literal
:
8299 case ta_remove_insn
:
8300 BFD_ASSERT (action
->removed_bytes
>= 0);
8301 orig_dot
+= action
->removed_bytes
;
8304 case ta_narrow_insn
:
8307 memmove (scratch
, &contents
[orig_dot
], orig_insn_size
);
8308 BFD_ASSERT (action
->removed_bytes
== 1);
8309 rv
= narrow_instruction (scratch
, final_size
, 0);
8311 memmove (&dup_contents
[dup_dot
], scratch
, copy_size
);
8312 orig_dot
+= orig_insn_size
;
8313 dup_dot
+= copy_size
;
8317 if (action
->removed_bytes
>= 0)
8318 orig_dot
+= action
->removed_bytes
;
8321 /* Already zeroed in dup_contents. Just bump the
8323 dup_dot
+= (-action
->removed_bytes
);
8328 BFD_ASSERT (action
->removed_bytes
== 0);
8331 case ta_convert_longcall
:
8332 case ta_remove_longcall
:
8333 /* These will be removed or converted before we get here. */
8340 memmove (scratch
, &contents
[orig_dot
], orig_insn_size
);
8341 BFD_ASSERT (action
->removed_bytes
== -1);
8342 rv
= widen_instruction (scratch
, final_size
, 0);
8344 memmove (&dup_contents
[dup_dot
], scratch
, copy_size
);
8345 orig_dot
+= orig_insn_size
;
8346 dup_dot
+= copy_size
;
8349 case ta_add_literal
:
8352 BFD_ASSERT (action
->removed_bytes
== -4);
8353 /* TBD -- place the literal value here and insert
8355 memset (&dup_contents
[dup_dot
], 0, 4);
8356 pin_internal_relocs (sec
, internal_relocs
);
8357 pin_contents (sec
, contents
);
8359 if (!move_literal (abfd
, link_info
, sec
, dup_dot
, dup_contents
,
8360 relax_info
, &internal_relocs
, &action
->value
))
8364 orig_dot_vo
+= copy_size
;
8366 orig_dot
+= orig_insn_size
;
8367 dup_dot
+= copy_size
;
8371 /* Not implemented yet. */
8376 size
-= action
->removed_bytes
;
8377 removed
+= action
->removed_bytes
;
8378 BFD_ASSERT (dup_dot
<= final_size
);
8379 BFD_ASSERT (orig_dot
<= orig_size
);
8382 orig_dot
+= orig_dot_copied
;
8383 orig_dot_copied
= 0;
8385 if (orig_dot
!= orig_size
)
8387 copy_size
= orig_size
- orig_dot
;
8388 BFD_ASSERT (orig_size
> orig_dot
);
8389 BFD_ASSERT (dup_dot
+ copy_size
== final_size
);
8390 memmove (&dup_contents
[dup_dot
], &contents
[orig_dot
], copy_size
);
8391 orig_dot
+= copy_size
;
8392 dup_dot
+= copy_size
;
8394 BFD_ASSERT (orig_size
== orig_dot
);
8395 BFD_ASSERT (final_size
== dup_dot
);
8397 /* Move the dup_contents back. */
8398 if (final_size
> orig_size
)
8400 /* Contents need to be reallocated. Swap the dup_contents into
8402 sec
->contents
= dup_contents
;
8404 contents
= dup_contents
;
8405 pin_contents (sec
, contents
);
8409 BFD_ASSERT (final_size
<= orig_size
);
8410 memset (contents
, 0, orig_size
);
8411 memcpy (contents
, dup_contents
, final_size
);
8412 free (dup_contents
);
8415 pin_contents (sec
, contents
);
8417 sec
->size
= final_size
;
8421 release_internal_relocs (sec
, internal_relocs
);
8422 release_contents (sec
, contents
);
8428 translate_section_fixes (asection
*sec
)
8430 xtensa_relax_info
*relax_info
;
8433 relax_info
= get_xtensa_relax_info (sec
);
8437 for (r
= relax_info
->fix_list
; r
!= NULL
; r
= r
->next
)
8438 if (!translate_reloc_bfd_fix (r
))
8445 /* Translate a fix given the mapping in the relax info for the target
8446 section. If it has already been translated, no work is required. */
8449 translate_reloc_bfd_fix (reloc_bfd_fix
*fix
)
8451 reloc_bfd_fix new_fix
;
8453 xtensa_relax_info
*relax_info
;
8454 removed_literal
*removed
;
8455 bfd_vma new_offset
, target_offset
;
8457 if (fix
->translated
)
8460 sec
= fix
->target_sec
;
8461 target_offset
= fix
->target_offset
;
8463 relax_info
= get_xtensa_relax_info (sec
);
8466 fix
->translated
= TRUE
;
8472 /* The fix does not need to be translated if the section cannot change. */
8473 if (!relax_info
->is_relaxable_literal_section
8474 && !relax_info
->is_relaxable_asm_section
)
8476 fix
->translated
= TRUE
;
8480 /* If the literal has been moved and this relocation was on an
8481 opcode, then the relocation should move to the new literal
8482 location. Otherwise, the relocation should move within the
8486 if (is_operand_relocation (fix
->src_type
))
8488 /* Check if the original relocation is against a literal being
8490 removed
= find_removed_literal (&relax_info
->removed_list
,
8498 /* The fact that there is still a relocation to this literal indicates
8499 that the literal is being coalesced, not simply removed. */
8500 BFD_ASSERT (removed
->to
.abfd
!= NULL
);
8502 /* This was moved to some other address (possibly another section). */
8503 new_sec
= r_reloc_get_section (&removed
->to
);
8507 relax_info
= get_xtensa_relax_info (sec
);
8509 (!relax_info
->is_relaxable_literal_section
8510 && !relax_info
->is_relaxable_asm_section
))
8512 target_offset
= removed
->to
.target_offset
;
8513 new_fix
.target_sec
= new_sec
;
8514 new_fix
.target_offset
= target_offset
;
8515 new_fix
.translated
= TRUE
;
8520 target_offset
= removed
->to
.target_offset
;
8521 new_fix
.target_sec
= new_sec
;
8524 /* The target address may have been moved within its section. */
8525 new_offset
= offset_with_removed_text (&relax_info
->action_list
,
8528 new_fix
.target_offset
= new_offset
;
8529 new_fix
.target_offset
= new_offset
;
8530 new_fix
.translated
= TRUE
;
8536 /* Fix up a relocation to take account of removed literals. */
8539 translate_reloc (const r_reloc
*orig_rel
, r_reloc
*new_rel
)
8542 xtensa_relax_info
*relax_info
;
8543 removed_literal
*removed
;
8544 bfd_vma new_offset
, target_offset
, removed_bytes
;
8546 *new_rel
= *orig_rel
;
8548 if (!r_reloc_is_defined (orig_rel
))
8550 sec
= r_reloc_get_section (orig_rel
);
8552 relax_info
= get_xtensa_relax_info (sec
);
8553 BFD_ASSERT (relax_info
);
8555 if (!relax_info
->is_relaxable_literal_section
8556 && !relax_info
->is_relaxable_asm_section
)
8559 target_offset
= orig_rel
->target_offset
;
8562 if (is_operand_relocation (ELF32_R_TYPE (orig_rel
->rela
.r_info
)))
8564 /* Check if the original relocation is against a literal being
8566 removed
= find_removed_literal (&relax_info
->removed_list
,
8569 if (removed
&& removed
->to
.abfd
)
8573 /* The fact that there is still a relocation to this literal indicates
8574 that the literal is being coalesced, not simply removed. */
8575 BFD_ASSERT (removed
->to
.abfd
!= NULL
);
8577 /* This was moved to some other address
8578 (possibly in another section). */
8579 *new_rel
= removed
->to
;
8580 new_sec
= r_reloc_get_section (new_rel
);
8584 relax_info
= get_xtensa_relax_info (sec
);
8586 || (!relax_info
->is_relaxable_literal_section
8587 && !relax_info
->is_relaxable_asm_section
))
8590 target_offset
= new_rel
->target_offset
;
8593 /* ...and the target address may have been moved within its section. */
8594 new_offset
= offset_with_removed_text (&relax_info
->action_list
,
8597 /* Modify the offset and addend. */
8598 removed_bytes
= target_offset
- new_offset
;
8599 new_rel
->target_offset
= new_offset
;
8600 new_rel
->rela
.r_addend
-= removed_bytes
;
8604 /* For dynamic links, there may be a dynamic relocation for each
8605 literal. The number of dynamic relocations must be computed in
8606 size_dynamic_sections, which occurs before relaxation. When a
8607 literal is removed, this function checks if there is a corresponding
8608 dynamic relocation and shrinks the size of the appropriate dynamic
8609 relocation section accordingly. At this point, the contents of the
8610 dynamic relocation sections have not yet been filled in, so there's
8611 nothing else that needs to be done. */
8614 shrink_dynamic_reloc_sections (struct bfd_link_info
*info
,
8616 asection
*input_section
,
8617 Elf_Internal_Rela
*rel
)
8619 struct elf_xtensa_link_hash_table
*htab
;
8620 Elf_Internal_Shdr
*symtab_hdr
;
8621 struct elf_link_hash_entry
**sym_hashes
;
8622 unsigned long r_symndx
;
8624 struct elf_link_hash_entry
*h
;
8625 bfd_boolean dynamic_symbol
;
8627 htab
= elf_xtensa_hash_table (info
);
8628 symtab_hdr
= &elf_tdata (abfd
)->symtab_hdr
;
8629 sym_hashes
= elf_sym_hashes (abfd
);
8631 r_type
= ELF32_R_TYPE (rel
->r_info
);
8632 r_symndx
= ELF32_R_SYM (rel
->r_info
);
8634 if (r_symndx
< symtab_hdr
->sh_info
)
8637 h
= sym_hashes
[r_symndx
- symtab_hdr
->sh_info
];
8639 dynamic_symbol
= elf_xtensa_dynamic_symbol_p (h
, info
);
8641 if ((r_type
== R_XTENSA_32
|| r_type
== R_XTENSA_PLT
)
8642 && (input_section
->flags
& SEC_ALLOC
) != 0
8643 && (dynamic_symbol
|| info
->shared
))
8646 bfd_boolean is_plt
= FALSE
;
8648 if (dynamic_symbol
&& r_type
== R_XTENSA_PLT
)
8650 srel
= htab
->srelplt
;
8654 srel
= htab
->srelgot
;
8656 /* Reduce size of the .rela.* section by one reloc. */
8657 BFD_ASSERT (srel
!= NULL
);
8658 BFD_ASSERT (srel
->size
>= sizeof (Elf32_External_Rela
));
8659 srel
->size
-= sizeof (Elf32_External_Rela
);
8663 asection
*splt
, *sgotplt
, *srelgot
;
8664 int reloc_index
, chunk
;
8666 /* Find the PLT reloc index of the entry being removed. This
8667 is computed from the size of ".rela.plt". It is needed to
8668 figure out which PLT chunk to resize. Usually "last index
8669 = size - 1" since the index starts at zero, but in this
8670 context, the size has just been decremented so there's no
8671 need to subtract one. */
8672 reloc_index
= srel
->size
/ sizeof (Elf32_External_Rela
);
8674 chunk
= reloc_index
/ PLT_ENTRIES_PER_CHUNK
;
8675 splt
= elf_xtensa_get_plt_section (info
, chunk
);
8676 sgotplt
= elf_xtensa_get_gotplt_section (info
, chunk
);
8677 BFD_ASSERT (splt
!= NULL
&& sgotplt
!= NULL
);
8679 /* Check if an entire PLT chunk has just been eliminated. */
8680 if (reloc_index
% PLT_ENTRIES_PER_CHUNK
== 0)
8682 /* The two magic GOT entries for that chunk can go away. */
8683 srelgot
= htab
->srelgot
;
8684 BFD_ASSERT (srelgot
!= NULL
);
8685 srelgot
->reloc_count
-= 2;
8686 srelgot
->size
-= 2 * sizeof (Elf32_External_Rela
);
8689 /* There should be only one entry left (and it will be
8691 BFD_ASSERT (sgotplt
->size
== 4);
8692 BFD_ASSERT (splt
->size
== PLT_ENTRY_SIZE
);
8695 BFD_ASSERT (sgotplt
->size
>= 4);
8696 BFD_ASSERT (splt
->size
>= PLT_ENTRY_SIZE
);
8699 splt
->size
-= PLT_ENTRY_SIZE
;
8705 /* Take an r_rel and move it to another section. This usually
8706 requires extending the interal_relocation array and pinning it. If
8707 the original r_rel is from the same BFD, we can complete this here.
8708 Otherwise, we add a fix record to let the final link fix the
8709 appropriate address. Contents and internal relocations for the
8710 section must be pinned after calling this routine. */
8713 move_literal (bfd
*abfd
,
8714 struct bfd_link_info
*link_info
,
8718 xtensa_relax_info
*relax_info
,
8719 Elf_Internal_Rela
**internal_relocs_p
,
8720 const literal_value
*lit
)
8722 Elf_Internal_Rela
*new_relocs
= NULL
;
8723 size_t new_relocs_count
= 0;
8724 Elf_Internal_Rela this_rela
;
8725 const r_reloc
*r_rel
;
8727 r_rel
= &lit
->r_rel
;
8728 BFD_ASSERT (elf_section_data (sec
)->relocs
== *internal_relocs_p
);
8730 if (r_reloc_is_const (r_rel
))
8731 bfd_put_32 (abfd
, lit
->value
, contents
+ offset
);
8736 asection
*target_sec
;
8740 r_type
= ELF32_R_TYPE (r_rel
->rela
.r_info
);
8741 target_sec
= r_reloc_get_section (r_rel
);
8743 /* This is the difficult case. We have to create a fix up. */
8744 this_rela
.r_offset
= offset
;
8745 this_rela
.r_info
= ELF32_R_INFO (0, r_type
);
8746 this_rela
.r_addend
=
8747 r_rel
->target_offset
- r_reloc_get_target_offset (r_rel
);
8748 bfd_put_32 (abfd
, lit
->value
, contents
+ offset
);
8750 /* Currently, we cannot move relocations during a relocatable link. */
8751 BFD_ASSERT (!link_info
->relocatable
);
8752 fix
= reloc_bfd_fix_init (sec
, offset
, r_type
, r_rel
->abfd
,
8753 r_reloc_get_section (r_rel
),
8754 r_rel
->target_offset
+ r_rel
->virtual_offset
,
8756 /* We also need to mark that relocations are needed here. */
8757 sec
->flags
|= SEC_RELOC
;
8759 translate_reloc_bfd_fix (fix
);
8760 /* This fix has not yet been translated. */
8763 /* Add the relocation. If we have already allocated our own
8764 space for the relocations and we have room for more, then use
8765 it. Otherwise, allocate new space and move the literals. */
8766 insert_at
= sec
->reloc_count
;
8767 for (i
= 0; i
< sec
->reloc_count
; ++i
)
8769 if (this_rela
.r_offset
< (*internal_relocs_p
)[i
].r_offset
)
8776 if (*internal_relocs_p
!= relax_info
->allocated_relocs
8777 || sec
->reloc_count
+ 1 > relax_info
->allocated_relocs_count
)
8779 BFD_ASSERT (relax_info
->allocated_relocs
== NULL
8780 || sec
->reloc_count
== relax_info
->relocs_count
);
8782 if (relax_info
->allocated_relocs_count
== 0)
8783 new_relocs_count
= (sec
->reloc_count
+ 2) * 2;
8785 new_relocs_count
= (relax_info
->allocated_relocs_count
+ 2) * 2;
8787 new_relocs
= (Elf_Internal_Rela
*)
8788 bfd_zmalloc (sizeof (Elf_Internal_Rela
) * (new_relocs_count
));
8792 /* We could handle this more quickly by finding the split point. */
8794 memcpy (new_relocs
, *internal_relocs_p
,
8795 insert_at
* sizeof (Elf_Internal_Rela
));
8797 new_relocs
[insert_at
] = this_rela
;
8799 if (insert_at
!= sec
->reloc_count
)
8800 memcpy (new_relocs
+ insert_at
+ 1,
8801 (*internal_relocs_p
) + insert_at
,
8802 (sec
->reloc_count
- insert_at
)
8803 * sizeof (Elf_Internal_Rela
));
8805 if (*internal_relocs_p
!= relax_info
->allocated_relocs
)
8807 /* The first time we re-allocate, we can only free the
8808 old relocs if they were allocated with bfd_malloc.
8809 This is not true when keep_memory is in effect. */
8810 if (!link_info
->keep_memory
)
8811 free (*internal_relocs_p
);
8814 free (*internal_relocs_p
);
8815 relax_info
->allocated_relocs
= new_relocs
;
8816 relax_info
->allocated_relocs_count
= new_relocs_count
;
8817 elf_section_data (sec
)->relocs
= new_relocs
;
8819 relax_info
->relocs_count
= sec
->reloc_count
;
8820 *internal_relocs_p
= new_relocs
;
8824 if (insert_at
!= sec
->reloc_count
)
8827 for (idx
= sec
->reloc_count
; idx
> insert_at
; idx
--)
8828 (*internal_relocs_p
)[idx
] = (*internal_relocs_p
)[idx
-1];
8830 (*internal_relocs_p
)[insert_at
] = this_rela
;
8832 if (relax_info
->allocated_relocs
)
8833 relax_info
->relocs_count
= sec
->reloc_count
;
8840 /* This is similar to relax_section except that when a target is moved,
8841 we shift addresses up. We also need to modify the size. This
8842 algorithm does NOT allow for relocations into the middle of the
8843 property sections. */
8846 relax_property_section (bfd
*abfd
,
8848 struct bfd_link_info
*link_info
)
8850 Elf_Internal_Rela
*internal_relocs
;
8853 bfd_boolean ok
= TRUE
;
8854 bfd_boolean is_full_prop_section
;
8855 size_t last_zfill_target_offset
= 0;
8856 asection
*last_zfill_target_sec
= NULL
;
8857 bfd_size_type sec_size
;
8858 bfd_size_type entry_size
;
8860 sec_size
= bfd_get_section_limit (abfd
, sec
);
8861 internal_relocs
= retrieve_internal_relocs (abfd
, sec
,
8862 link_info
->keep_memory
);
8863 contents
= retrieve_contents (abfd
, sec
, link_info
->keep_memory
);
8864 if (contents
== NULL
&& sec_size
!= 0)
8870 is_full_prop_section
= xtensa_is_proptable_section (sec
);
8871 if (is_full_prop_section
)
8876 if (internal_relocs
)
8878 for (i
= 0; i
< sec
->reloc_count
; i
++)
8880 Elf_Internal_Rela
*irel
;
8881 xtensa_relax_info
*target_relax_info
;
8883 asection
*target_sec
;
8885 bfd_byte
*size_p
, *flags_p
;
8887 /* Locally change the source address.
8888 Translate the target to the new target address.
8889 If it points to this section and has been removed, MOVE IT.
8890 Also, don't forget to modify the associated SIZE at
8893 irel
= &internal_relocs
[i
];
8894 r_type
= ELF32_R_TYPE (irel
->r_info
);
8895 if (r_type
== R_XTENSA_NONE
)
8898 /* Find the literal value. */
8899 r_reloc_init (&val
.r_rel
, abfd
, irel
, contents
, sec_size
);
8900 size_p
= &contents
[irel
->r_offset
+ 4];
8902 if (is_full_prop_section
)
8903 flags_p
= &contents
[irel
->r_offset
+ 8];
8904 BFD_ASSERT (irel
->r_offset
+ entry_size
<= sec_size
);
8906 target_sec
= r_reloc_get_section (&val
.r_rel
);
8907 target_relax_info
= get_xtensa_relax_info (target_sec
);
8909 if (target_relax_info
8910 && (target_relax_info
->is_relaxable_literal_section
8911 || target_relax_info
->is_relaxable_asm_section
))
8913 /* Translate the relocation's destination. */
8914 bfd_vma new_offset
, new_end_offset
;
8915 long old_size
, new_size
;
8917 new_offset
= offset_with_removed_text
8918 (&target_relax_info
->action_list
, val
.r_rel
.target_offset
);
8920 /* Assert that we are not out of bounds. */
8921 old_size
= bfd_get_32 (abfd
, size_p
);
8925 /* Only the first zero-sized unreachable entry is
8926 allowed to expand. In this case the new offset
8927 should be the offset before the fill and the new
8928 size is the expansion size. For other zero-sized
8929 entries the resulting size should be zero with an
8930 offset before or after the fill address depending
8931 on whether the expanding unreachable entry
8933 if (last_zfill_target_sec
8934 && last_zfill_target_sec
== target_sec
8935 && last_zfill_target_offset
== val
.r_rel
.target_offset
)
8936 new_end_offset
= new_offset
;
8939 new_end_offset
= new_offset
;
8940 new_offset
= offset_with_removed_text_before_fill
8941 (&target_relax_info
->action_list
,
8942 val
.r_rel
.target_offset
);
8944 /* If it is not unreachable and we have not yet
8945 seen an unreachable at this address, place it
8946 before the fill address. */
8948 || (bfd_get_32 (abfd
, flags_p
)
8949 & XTENSA_PROP_UNREACHABLE
) == 0)
8950 new_end_offset
= new_offset
;
8953 last_zfill_target_sec
= target_sec
;
8954 last_zfill_target_offset
= val
.r_rel
.target_offset
;
8960 new_end_offset
= offset_with_removed_text_before_fill
8961 (&target_relax_info
->action_list
,
8962 val
.r_rel
.target_offset
+ old_size
);
8965 new_size
= new_end_offset
- new_offset
;
8967 if (new_size
!= old_size
)
8969 bfd_put_32 (abfd
, new_size
, size_p
);
8970 pin_contents (sec
, contents
);
8973 if (new_offset
!= val
.r_rel
.target_offset
)
8975 bfd_vma diff
= new_offset
- val
.r_rel
.target_offset
;
8976 irel
->r_addend
+= diff
;
8977 pin_internal_relocs (sec
, internal_relocs
);
8983 /* Combine adjacent property table entries. This is also done in
8984 finish_dynamic_sections() but at that point it's too late to
8985 reclaim the space in the output section, so we do this twice. */
8987 if (internal_relocs
&& (!link_info
->relocatable
8988 || xtensa_is_littable_section (sec
)))
8990 Elf_Internal_Rela
*last_irel
= NULL
;
8991 Elf_Internal_Rela
*irel
, *next_rel
, *rel_end
;
8992 int removed_bytes
= 0;
8994 bfd_vma section_size
;
8995 flagword predef_flags
;
8997 predef_flags
= xtensa_get_property_predef_flags (sec
);
8999 /* Walk over memory and relocations at the same time.
9000 This REQUIRES that the internal_relocs be sorted by offset. */
9001 qsort (internal_relocs
, sec
->reloc_count
, sizeof (Elf_Internal_Rela
),
9002 internal_reloc_compare
);
9004 pin_internal_relocs (sec
, internal_relocs
);
9005 pin_contents (sec
, contents
);
9007 next_rel
= internal_relocs
;
9008 rel_end
= internal_relocs
+ sec
->reloc_count
;
9010 section_size
= sec
->size
;
9011 BFD_ASSERT (section_size
% entry_size
== 0);
9013 for (offset
= 0; offset
< section_size
; offset
+= entry_size
)
9015 Elf_Internal_Rela
*offset_rel
, *extra_rel
;
9016 bfd_vma bytes_to_remove
, size
, actual_offset
;
9017 bfd_boolean remove_this_rel
;
9020 /* Find the first relocation for the entry at the current offset.
9021 Adjust the offsets of any extra relocations for the previous
9026 for (irel
= next_rel
; irel
< rel_end
; irel
++)
9028 if ((irel
->r_offset
== offset
9029 && ELF32_R_TYPE (irel
->r_info
) != R_XTENSA_NONE
)
9030 || irel
->r_offset
> offset
)
9035 irel
->r_offset
-= removed_bytes
;
9039 /* Find the next relocation (if there are any left). */
9043 for (irel
= offset_rel
+ 1; irel
< rel_end
; irel
++)
9045 if (ELF32_R_TYPE (irel
->r_info
) != R_XTENSA_NONE
)
9053 /* Check if there are relocations on the current entry. There
9054 should usually be a relocation on the offset field. If there
9055 are relocations on the size or flags, then we can't optimize
9056 this entry. Also, find the next relocation to examine on the
9060 if (offset_rel
->r_offset
>= offset
+ entry_size
)
9062 next_rel
= offset_rel
;
9063 /* There are no relocations on the current entry, but we
9064 might still be able to remove it if the size is zero. */
9067 else if (offset_rel
->r_offset
> offset
9069 && extra_rel
->r_offset
< offset
+ entry_size
))
9071 /* There is a relocation on the size or flags, so we can't
9072 do anything with this entry. Continue with the next. */
9073 next_rel
= offset_rel
;
9078 BFD_ASSERT (offset_rel
->r_offset
== offset
);
9079 offset_rel
->r_offset
-= removed_bytes
;
9080 next_rel
= offset_rel
+ 1;
9086 remove_this_rel
= FALSE
;
9087 bytes_to_remove
= 0;
9088 actual_offset
= offset
- removed_bytes
;
9089 size
= bfd_get_32 (abfd
, &contents
[actual_offset
+ 4]);
9091 if (is_full_prop_section
)
9092 flags
= bfd_get_32 (abfd
, &contents
[actual_offset
+ 8]);
9094 flags
= predef_flags
;
9097 && (flags
& XTENSA_PROP_ALIGN
) == 0
9098 && (flags
& XTENSA_PROP_UNREACHABLE
) == 0)
9100 /* Always remove entries with zero size and no alignment. */
9101 bytes_to_remove
= entry_size
;
9103 remove_this_rel
= TRUE
;
9106 && ELF32_R_TYPE (offset_rel
->r_info
) == R_XTENSA_32
)
9112 bfd_get_32 (abfd
, &contents
[last_irel
->r_offset
+ 4]);
9113 bfd_vma old_address
=
9114 (last_irel
->r_addend
9115 + bfd_get_32 (abfd
, &contents
[last_irel
->r_offset
]));
9116 bfd_vma new_address
=
9117 (offset_rel
->r_addend
9118 + bfd_get_32 (abfd
, &contents
[actual_offset
]));
9119 if (is_full_prop_section
)
9120 old_flags
= bfd_get_32
9121 (abfd
, &contents
[last_irel
->r_offset
+ 8]);
9123 old_flags
= predef_flags
;
9125 if ((ELF32_R_SYM (offset_rel
->r_info
)
9126 == ELF32_R_SYM (last_irel
->r_info
))
9127 && old_address
+ old_size
== new_address
9128 && old_flags
== flags
9129 && (old_flags
& XTENSA_PROP_INSN_BRANCH_TARGET
) == 0
9130 && (old_flags
& XTENSA_PROP_INSN_LOOP_TARGET
) == 0)
9132 /* Fix the old size. */
9133 bfd_put_32 (abfd
, old_size
+ size
,
9134 &contents
[last_irel
->r_offset
+ 4]);
9135 bytes_to_remove
= entry_size
;
9136 remove_this_rel
= TRUE
;
9139 last_irel
= offset_rel
;
9142 last_irel
= offset_rel
;
9145 if (remove_this_rel
)
9147 offset_rel
->r_info
= ELF32_R_INFO (0, R_XTENSA_NONE
);
9148 /* In case this is the last entry, move the relocation offset
9149 to the previous entry, if there is one. */
9150 if (offset_rel
->r_offset
>= bytes_to_remove
)
9151 offset_rel
->r_offset
-= bytes_to_remove
;
9153 offset_rel
->r_offset
= 0;
9156 if (bytes_to_remove
!= 0)
9158 removed_bytes
+= bytes_to_remove
;
9159 if (offset
+ bytes_to_remove
< section_size
)
9160 memmove (&contents
[actual_offset
],
9161 &contents
[actual_offset
+ bytes_to_remove
],
9162 section_size
- offset
- bytes_to_remove
);
9168 /* Fix up any extra relocations on the last entry. */
9169 for (irel
= next_rel
; irel
< rel_end
; irel
++)
9170 irel
->r_offset
-= removed_bytes
;
9172 /* Clear the removed bytes. */
9173 memset (&contents
[section_size
- removed_bytes
], 0, removed_bytes
);
9175 sec
->size
= section_size
- removed_bytes
;
9177 if (xtensa_is_littable_section (sec
))
9179 asection
*sgotloc
= elf_xtensa_hash_table (link_info
)->sgotloc
;
9181 sgotloc
->size
-= removed_bytes
;
9187 release_internal_relocs (sec
, internal_relocs
);
9188 release_contents (sec
, contents
);
9193 /* Third relaxation pass. */
9195 /* Change symbol values to account for removed literals. */
9198 relax_section_symbols (bfd
*abfd
, asection
*sec
)
9200 xtensa_relax_info
*relax_info
;
9201 unsigned int sec_shndx
;
9202 Elf_Internal_Shdr
*symtab_hdr
;
9203 Elf_Internal_Sym
*isymbuf
;
9204 unsigned i
, num_syms
, num_locals
;
9206 relax_info
= get_xtensa_relax_info (sec
);
9207 BFD_ASSERT (relax_info
);
9209 if (!relax_info
->is_relaxable_literal_section
9210 && !relax_info
->is_relaxable_asm_section
)
9213 sec_shndx
= _bfd_elf_section_from_bfd_section (abfd
, sec
);
9215 symtab_hdr
= &elf_tdata (abfd
)->symtab_hdr
;
9216 isymbuf
= retrieve_local_syms (abfd
);
9218 num_syms
= symtab_hdr
->sh_size
/ sizeof (Elf32_External_Sym
);
9219 num_locals
= symtab_hdr
->sh_info
;
9221 /* Adjust the local symbols defined in this section. */
9222 for (i
= 0; i
< num_locals
; i
++)
9224 Elf_Internal_Sym
*isym
= &isymbuf
[i
];
9226 if (isym
->st_shndx
== sec_shndx
)
9228 bfd_vma new_address
= offset_with_removed_text
9229 (&relax_info
->action_list
, isym
->st_value
);
9230 bfd_vma new_size
= isym
->st_size
;
9232 if (ELF32_ST_TYPE (isym
->st_info
) == STT_FUNC
)
9234 bfd_vma new_end
= offset_with_removed_text
9235 (&relax_info
->action_list
, isym
->st_value
+ isym
->st_size
);
9236 new_size
= new_end
- new_address
;
9239 isym
->st_value
= new_address
;
9240 isym
->st_size
= new_size
;
9244 /* Now adjust the global symbols defined in this section. */
9245 for (i
= 0; i
< (num_syms
- num_locals
); i
++)
9247 struct elf_link_hash_entry
*sym_hash
;
9249 sym_hash
= elf_sym_hashes (abfd
)[i
];
9251 if (sym_hash
->root
.type
== bfd_link_hash_warning
)
9252 sym_hash
= (struct elf_link_hash_entry
*) sym_hash
->root
.u
.i
.link
;
9254 if ((sym_hash
->root
.type
== bfd_link_hash_defined
9255 || sym_hash
->root
.type
== bfd_link_hash_defweak
)
9256 && sym_hash
->root
.u
.def
.section
== sec
)
9258 bfd_vma new_address
= offset_with_removed_text
9259 (&relax_info
->action_list
, sym_hash
->root
.u
.def
.value
);
9260 bfd_vma new_size
= sym_hash
->size
;
9262 if (sym_hash
->type
== STT_FUNC
)
9264 bfd_vma new_end
= offset_with_removed_text
9265 (&relax_info
->action_list
,
9266 sym_hash
->root
.u
.def
.value
+ sym_hash
->size
);
9267 new_size
= new_end
- new_address
;
9270 sym_hash
->root
.u
.def
.value
= new_address
;
9271 sym_hash
->size
= new_size
;
9279 /* "Fix" handling functions, called while performing relocations. */
9282 do_fix_for_relocatable_link (Elf_Internal_Rela
*rel
,
9284 asection
*input_section
,
9288 asection
*sec
, *old_sec
;
9290 int r_type
= ELF32_R_TYPE (rel
->r_info
);
9293 if (r_type
== R_XTENSA_NONE
)
9296 fix
= get_bfd_fix (input_section
, rel
->r_offset
, r_type
);
9300 r_reloc_init (&r_rel
, input_bfd
, rel
, contents
,
9301 bfd_get_section_limit (input_bfd
, input_section
));
9302 old_sec
= r_reloc_get_section (&r_rel
);
9303 old_offset
= r_rel
.target_offset
;
9305 if (!old_sec
|| !r_reloc_is_defined (&r_rel
))
9307 if (r_type
!= R_XTENSA_ASM_EXPAND
)
9309 (*_bfd_error_handler
)
9310 (_("%B(%A+0x%lx): unexpected fix for %s relocation"),
9311 input_bfd
, input_section
, rel
->r_offset
,
9312 elf_howto_table
[r_type
].name
);
9315 /* Leave it be. Resolution will happen in a later stage. */
9319 sec
= fix
->target_sec
;
9320 rel
->r_addend
+= ((sec
->output_offset
+ fix
->target_offset
)
9321 - (old_sec
->output_offset
+ old_offset
));
9328 do_fix_for_final_link (Elf_Internal_Rela
*rel
,
9330 asection
*input_section
,
9332 bfd_vma
*relocationp
)
9335 int r_type
= ELF32_R_TYPE (rel
->r_info
);
9339 if (r_type
== R_XTENSA_NONE
)
9342 fix
= get_bfd_fix (input_section
, rel
->r_offset
, r_type
);
9346 sec
= fix
->target_sec
;
9348 fixup_diff
= rel
->r_addend
;
9349 if (elf_howto_table
[fix
->src_type
].partial_inplace
)
9351 bfd_vma inplace_val
;
9352 BFD_ASSERT (fix
->src_offset
9353 < bfd_get_section_limit (input_bfd
, input_section
));
9354 inplace_val
= bfd_get_32 (input_bfd
, &contents
[fix
->src_offset
]);
9355 fixup_diff
+= inplace_val
;
9358 *relocationp
= (sec
->output_section
->vma
9359 + sec
->output_offset
9360 + fix
->target_offset
- fixup_diff
);
9364 /* Miscellaneous utility functions.... */
9367 elf_xtensa_get_plt_section (struct bfd_link_info
*info
, int chunk
)
9369 struct elf_xtensa_link_hash_table
*htab
;
9375 htab
= elf_xtensa_hash_table (info
);
9379 dynobj
= elf_hash_table (info
)->dynobj
;
9380 sprintf (plt_name
, ".plt.%u", chunk
);
9381 return bfd_get_section_by_name (dynobj
, plt_name
);
9386 elf_xtensa_get_gotplt_section (struct bfd_link_info
*info
, int chunk
)
9388 struct elf_xtensa_link_hash_table
*htab
;
9394 htab
= elf_xtensa_hash_table (info
);
9395 return htab
->sgotplt
;
9398 dynobj
= elf_hash_table (info
)->dynobj
;
9399 sprintf (got_name
, ".got.plt.%u", chunk
);
9400 return bfd_get_section_by_name (dynobj
, got_name
);
9404 /* Get the input section for a given symbol index.
9406 . a section symbol, return the section;
9407 . a common symbol, return the common section;
9408 . an undefined symbol, return the undefined section;
9409 . an indirect symbol, follow the links;
9410 . an absolute value, return the absolute section. */
9413 get_elf_r_symndx_section (bfd
*abfd
, unsigned long r_symndx
)
9415 Elf_Internal_Shdr
*symtab_hdr
= &elf_tdata (abfd
)->symtab_hdr
;
9416 asection
*target_sec
= NULL
;
9417 if (r_symndx
< symtab_hdr
->sh_info
)
9419 Elf_Internal_Sym
*isymbuf
;
9420 unsigned int section_index
;
9422 isymbuf
= retrieve_local_syms (abfd
);
9423 section_index
= isymbuf
[r_symndx
].st_shndx
;
9425 if (section_index
== SHN_UNDEF
)
9426 target_sec
= bfd_und_section_ptr
;
9427 else if (section_index
> 0 && section_index
< SHN_LORESERVE
)
9428 target_sec
= bfd_section_from_elf_index (abfd
, section_index
);
9429 else if (section_index
== SHN_ABS
)
9430 target_sec
= bfd_abs_section_ptr
;
9431 else if (section_index
== SHN_COMMON
)
9432 target_sec
= bfd_com_section_ptr
;
9439 unsigned long indx
= r_symndx
- symtab_hdr
->sh_info
;
9440 struct elf_link_hash_entry
*h
= elf_sym_hashes (abfd
)[indx
];
9442 while (h
->root
.type
== bfd_link_hash_indirect
9443 || h
->root
.type
== bfd_link_hash_warning
)
9444 h
= (struct elf_link_hash_entry
*) h
->root
.u
.i
.link
;
9446 switch (h
->root
.type
)
9448 case bfd_link_hash_defined
:
9449 case bfd_link_hash_defweak
:
9450 target_sec
= h
->root
.u
.def
.section
;
9452 case bfd_link_hash_common
:
9453 target_sec
= bfd_com_section_ptr
;
9455 case bfd_link_hash_undefined
:
9456 case bfd_link_hash_undefweak
:
9457 target_sec
= bfd_und_section_ptr
;
9459 default: /* New indirect warning. */
9460 target_sec
= bfd_und_section_ptr
;
9468 static struct elf_link_hash_entry
*
9469 get_elf_r_symndx_hash_entry (bfd
*abfd
, unsigned long r_symndx
)
9472 struct elf_link_hash_entry
*h
;
9473 Elf_Internal_Shdr
*symtab_hdr
= &elf_tdata (abfd
)->symtab_hdr
;
9475 if (r_symndx
< symtab_hdr
->sh_info
)
9478 indx
= r_symndx
- symtab_hdr
->sh_info
;
9479 h
= elf_sym_hashes (abfd
)[indx
];
9480 while (h
->root
.type
== bfd_link_hash_indirect
9481 || h
->root
.type
== bfd_link_hash_warning
)
9482 h
= (struct elf_link_hash_entry
*) h
->root
.u
.i
.link
;
9487 /* Get the section-relative offset for a symbol number. */
9490 get_elf_r_symndx_offset (bfd
*abfd
, unsigned long r_symndx
)
9492 Elf_Internal_Shdr
*symtab_hdr
= &elf_tdata (abfd
)->symtab_hdr
;
9495 if (r_symndx
< symtab_hdr
->sh_info
)
9497 Elf_Internal_Sym
*isymbuf
;
9498 isymbuf
= retrieve_local_syms (abfd
);
9499 offset
= isymbuf
[r_symndx
].st_value
;
9503 unsigned long indx
= r_symndx
- symtab_hdr
->sh_info
;
9504 struct elf_link_hash_entry
*h
=
9505 elf_sym_hashes (abfd
)[indx
];
9507 while (h
->root
.type
== bfd_link_hash_indirect
9508 || h
->root
.type
== bfd_link_hash_warning
)
9509 h
= (struct elf_link_hash_entry
*) h
->root
.u
.i
.link
;
9510 if (h
->root
.type
== bfd_link_hash_defined
9511 || h
->root
.type
== bfd_link_hash_defweak
)
9512 offset
= h
->root
.u
.def
.value
;
9519 is_reloc_sym_weak (bfd
*abfd
, Elf_Internal_Rela
*rel
)
9521 unsigned long r_symndx
= ELF32_R_SYM (rel
->r_info
);
9522 struct elf_link_hash_entry
*h
;
9524 h
= get_elf_r_symndx_hash_entry (abfd
, r_symndx
);
9525 if (h
&& h
->root
.type
== bfd_link_hash_defweak
)
9532 pcrel_reloc_fits (xtensa_opcode opc
,
9534 bfd_vma self_address
,
9535 bfd_vma dest_address
)
9537 xtensa_isa isa
= xtensa_default_isa
;
9538 uint32 valp
= dest_address
;
9539 if (xtensa_operand_do_reloc (isa
, opc
, opnd
, &valp
, self_address
)
9540 || xtensa_operand_encode (isa
, opc
, opnd
, &valp
))
9547 xtensa_is_property_section (asection
*sec
)
9549 if (xtensa_is_insntable_section (sec
)
9550 || xtensa_is_littable_section (sec
)
9551 || xtensa_is_proptable_section (sec
))
9559 xtensa_is_insntable_section (asection
*sec
)
9561 if (CONST_STRNEQ (sec
->name
, XTENSA_INSN_SEC_NAME
)
9562 || CONST_STRNEQ (sec
->name
, ".gnu.linkonce.x."))
9570 xtensa_is_littable_section (asection
*sec
)
9572 if (CONST_STRNEQ (sec
->name
, XTENSA_LIT_SEC_NAME
)
9573 || CONST_STRNEQ (sec
->name
, ".gnu.linkonce.p."))
9581 xtensa_is_proptable_section (asection
*sec
)
9583 if (CONST_STRNEQ (sec
->name
, XTENSA_PROP_SEC_NAME
)
9584 || CONST_STRNEQ (sec
->name
, ".gnu.linkonce.prop."))
9592 internal_reloc_compare (const void *ap
, const void *bp
)
9594 const Elf_Internal_Rela
*a
= (const Elf_Internal_Rela
*) ap
;
9595 const Elf_Internal_Rela
*b
= (const Elf_Internal_Rela
*) bp
;
9597 if (a
->r_offset
!= b
->r_offset
)
9598 return (a
->r_offset
- b
->r_offset
);
9600 /* We don't need to sort on these criteria for correctness,
9601 but enforcing a more strict ordering prevents unstable qsort
9602 from behaving differently with different implementations.
9603 Without the code below we get correct but different results
9604 on Solaris 2.7 and 2.8. We would like to always produce the
9605 same results no matter the host. */
9607 if (a
->r_info
!= b
->r_info
)
9608 return (a
->r_info
- b
->r_info
);
9610 return (a
->r_addend
- b
->r_addend
);
9615 internal_reloc_matches (const void *ap
, const void *bp
)
9617 const Elf_Internal_Rela
*a
= (const Elf_Internal_Rela
*) ap
;
9618 const Elf_Internal_Rela
*b
= (const Elf_Internal_Rela
*) bp
;
9620 /* Check if one entry overlaps with the other; this shouldn't happen
9621 except when searching for a match. */
9622 return (a
->r_offset
- b
->r_offset
);
9626 /* Predicate function used to look up a section in a particular group. */
9629 match_section_group (bfd
*abfd ATTRIBUTE_UNUSED
, asection
*sec
, void *inf
)
9631 const char *gname
= inf
;
9632 const char *group_name
= elf_group_name (sec
);
9634 return (group_name
== gname
9635 || (group_name
!= NULL
9637 && strcmp (group_name
, gname
) == 0));
9641 static int linkonce_len
= sizeof (".gnu.linkonce.") - 1;
9644 xtensa_get_property_section (asection
*sec
, const char *base_name
)
9646 const char *suffix
, *group_name
;
9647 char *prop_sec_name
;
9650 group_name
= elf_group_name (sec
);
9653 suffix
= strrchr (sec
->name
, '.');
9654 if (suffix
== sec
->name
)
9656 prop_sec_name
= (char *) bfd_malloc (strlen (base_name
) + 1
9657 + (suffix
? strlen (suffix
) : 0));
9658 strcpy (prop_sec_name
, base_name
);
9660 strcat (prop_sec_name
, suffix
);
9662 else if (strncmp (sec
->name
, ".gnu.linkonce.", linkonce_len
) == 0)
9664 char *linkonce_kind
= 0;
9666 if (strcmp (base_name
, XTENSA_INSN_SEC_NAME
) == 0)
9667 linkonce_kind
= "x.";
9668 else if (strcmp (base_name
, XTENSA_LIT_SEC_NAME
) == 0)
9669 linkonce_kind
= "p.";
9670 else if (strcmp (base_name
, XTENSA_PROP_SEC_NAME
) == 0)
9671 linkonce_kind
= "prop.";
9675 prop_sec_name
= (char *) bfd_malloc (strlen (sec
->name
)
9676 + strlen (linkonce_kind
) + 1);
9677 memcpy (prop_sec_name
, ".gnu.linkonce.", linkonce_len
);
9678 strcpy (prop_sec_name
+ linkonce_len
, linkonce_kind
);
9680 suffix
= sec
->name
+ linkonce_len
;
9681 /* For backward compatibility, replace "t." instead of inserting
9682 the new linkonce_kind (but not for "prop" sections). */
9683 if (CONST_STRNEQ (suffix
, "t.") && linkonce_kind
[1] == '.')
9685 strcat (prop_sec_name
+ linkonce_len
, suffix
);
9688 prop_sec_name
= strdup (base_name
);
9690 /* Check if the section already exists. */
9691 prop_sec
= bfd_get_section_by_name_if (sec
->owner
, prop_sec_name
,
9692 match_section_group
,
9693 (void *) group_name
);
9694 /* If not, create it. */
9697 flagword flags
= (SEC_RELOC
| SEC_HAS_CONTENTS
| SEC_READONLY
);
9698 flags
|= (bfd_get_section_flags (sec
->owner
, sec
)
9699 & (SEC_LINK_ONCE
| SEC_LINK_DUPLICATES
));
9701 prop_sec
= bfd_make_section_anyway_with_flags
9702 (sec
->owner
, strdup (prop_sec_name
), flags
);
9706 elf_group_name (prop_sec
) = group_name
;
9709 free (prop_sec_name
);
9715 xtensa_get_property_predef_flags (asection
*sec
)
9717 if (xtensa_is_insntable_section (sec
))
9718 return (XTENSA_PROP_INSN
9719 | XTENSA_PROP_INSN_NO_TRANSFORM
9720 | XTENSA_PROP_INSN_NO_REORDER
);
9722 if (xtensa_is_littable_section (sec
))
9723 return (XTENSA_PROP_LITERAL
9724 | XTENSA_PROP_INSN_NO_TRANSFORM
9725 | XTENSA_PROP_INSN_NO_REORDER
);
9731 /* Other functions called directly by the linker. */
9734 xtensa_callback_required_dependence (bfd
*abfd
,
9736 struct bfd_link_info
*link_info
,
9737 deps_callback_t callback
,
9740 Elf_Internal_Rela
*internal_relocs
;
9743 bfd_boolean ok
= TRUE
;
9744 bfd_size_type sec_size
;
9746 sec_size
= bfd_get_section_limit (abfd
, sec
);
9748 /* ".plt*" sections have no explicit relocations but they contain L32R
9749 instructions that reference the corresponding ".got.plt*" sections. */
9750 if ((sec
->flags
& SEC_LINKER_CREATED
) != 0
9751 && CONST_STRNEQ (sec
->name
, ".plt"))
9755 /* Find the corresponding ".got.plt*" section. */
9756 if (sec
->name
[4] == '\0')
9757 sgotplt
= bfd_get_section_by_name (sec
->owner
, ".got.plt");
9763 BFD_ASSERT (sec
->name
[4] == '.');
9764 chunk
= strtol (&sec
->name
[5], NULL
, 10);
9766 sprintf (got_name
, ".got.plt.%u", chunk
);
9767 sgotplt
= bfd_get_section_by_name (sec
->owner
, got_name
);
9769 BFD_ASSERT (sgotplt
);
9771 /* Assume worst-case offsets: L32R at the very end of the ".plt"
9772 section referencing a literal at the very beginning of
9773 ".got.plt". This is very close to the real dependence, anyway. */
9774 (*callback
) (sec
, sec_size
, sgotplt
, 0, closure
);
9777 internal_relocs
= retrieve_internal_relocs (abfd
, sec
,
9778 link_info
->keep_memory
);
9779 if (internal_relocs
== NULL
9780 || sec
->reloc_count
== 0)
9783 /* Cache the contents for the duration of this scan. */
9784 contents
= retrieve_contents (abfd
, sec
, link_info
->keep_memory
);
9785 if (contents
== NULL
&& sec_size
!= 0)
9791 if (!xtensa_default_isa
)
9792 xtensa_default_isa
= xtensa_isa_init (0, 0);
9794 for (i
= 0; i
< sec
->reloc_count
; i
++)
9796 Elf_Internal_Rela
*irel
= &internal_relocs
[i
];
9797 if (is_l32r_relocation (abfd
, sec
, contents
, irel
))
9800 asection
*target_sec
;
9801 bfd_vma target_offset
;
9803 r_reloc_init (&l32r_rel
, abfd
, irel
, contents
, sec_size
);
9806 /* L32Rs must be local to the input file. */
9807 if (r_reloc_is_defined (&l32r_rel
))
9809 target_sec
= r_reloc_get_section (&l32r_rel
);
9810 target_offset
= l32r_rel
.target_offset
;
9812 (*callback
) (sec
, irel
->r_offset
, target_sec
, target_offset
,
9818 release_internal_relocs (sec
, internal_relocs
);
9819 release_contents (sec
, contents
);
9823 /* The default literal sections should always be marked as "code" (i.e.,
9824 SHF_EXECINSTR). This is particularly important for the Linux kernel
9825 module loader so that the literals are not placed after the text. */
9826 static const struct bfd_elf_special_section elf_xtensa_special_sections
[] =
9828 { STRING_COMMA_LEN (".fini.literal"), 0, SHT_PROGBITS
, SHF_ALLOC
+ SHF_EXECINSTR
},
9829 { STRING_COMMA_LEN (".init.literal"), 0, SHT_PROGBITS
, SHF_ALLOC
+ SHF_EXECINSTR
},
9830 { STRING_COMMA_LEN (".literal"), 0, SHT_PROGBITS
, SHF_ALLOC
+ SHF_EXECINSTR
},
9831 { STRING_COMMA_LEN (".xtensa.info"), 0, SHT_NOTE
, 0 },
9832 { NULL
, 0, 0, 0, 0 }
9836 #define TARGET_LITTLE_SYM bfd_elf32_xtensa_le_vec
9837 #define TARGET_LITTLE_NAME "elf32-xtensa-le"
9838 #define TARGET_BIG_SYM bfd_elf32_xtensa_be_vec
9839 #define TARGET_BIG_NAME "elf32-xtensa-be"
9840 #define ELF_ARCH bfd_arch_xtensa
9842 #define ELF_MACHINE_CODE EM_XTENSA
9843 #define ELF_MACHINE_ALT1 EM_XTENSA_OLD
9846 #define ELF_MAXPAGESIZE (1 << XCHAL_MMU_MIN_PTE_PAGE_SIZE)
9847 #else /* !XCHAL_HAVE_MMU */
9848 #define ELF_MAXPAGESIZE 1
9849 #endif /* !XCHAL_HAVE_MMU */
9850 #endif /* ELF_ARCH */
9852 #define elf_backend_can_gc_sections 1
9853 #define elf_backend_can_refcount 1
9854 #define elf_backend_plt_readonly 1
9855 #define elf_backend_got_header_size 4
9856 #define elf_backend_want_dynbss 0
9857 #define elf_backend_want_got_plt 1
9859 #define elf_info_to_howto elf_xtensa_info_to_howto_rela
9861 #define bfd_elf32_bfd_merge_private_bfd_data elf_xtensa_merge_private_bfd_data
9862 #define bfd_elf32_new_section_hook elf_xtensa_new_section_hook
9863 #define bfd_elf32_bfd_print_private_bfd_data elf_xtensa_print_private_bfd_data
9864 #define bfd_elf32_bfd_relax_section elf_xtensa_relax_section
9865 #define bfd_elf32_bfd_reloc_type_lookup elf_xtensa_reloc_type_lookup
9866 #define bfd_elf32_bfd_reloc_name_lookup \
9867 elf_xtensa_reloc_name_lookup
9868 #define bfd_elf32_bfd_set_private_flags elf_xtensa_set_private_flags
9869 #define bfd_elf32_bfd_link_hash_table_create elf_xtensa_link_hash_table_create
9871 #define elf_backend_adjust_dynamic_symbol elf_xtensa_adjust_dynamic_symbol
9872 #define elf_backend_check_relocs elf_xtensa_check_relocs
9873 #define elf_backend_create_dynamic_sections elf_xtensa_create_dynamic_sections
9874 #define elf_backend_discard_info elf_xtensa_discard_info
9875 #define elf_backend_ignore_discarded_relocs elf_xtensa_ignore_discarded_relocs
9876 #define elf_backend_final_write_processing elf_xtensa_final_write_processing
9877 #define elf_backend_finish_dynamic_sections elf_xtensa_finish_dynamic_sections
9878 #define elf_backend_finish_dynamic_symbol elf_xtensa_finish_dynamic_symbol
9879 #define elf_backend_gc_mark_hook elf_xtensa_gc_mark_hook
9880 #define elf_backend_gc_sweep_hook elf_xtensa_gc_sweep_hook
9881 #define elf_backend_grok_prstatus elf_xtensa_grok_prstatus
9882 #define elf_backend_grok_psinfo elf_xtensa_grok_psinfo
9883 #define elf_backend_object_p elf_xtensa_object_p
9884 #define elf_backend_reloc_type_class elf_xtensa_reloc_type_class
9885 #define elf_backend_relocate_section elf_xtensa_relocate_section
9886 #define elf_backend_size_dynamic_sections elf_xtensa_size_dynamic_sections
9887 #define elf_backend_omit_section_dynsym \
9888 ((bfd_boolean (*) (bfd *, struct bfd_link_info *, asection *)) bfd_true)
9889 #define elf_backend_special_sections elf_xtensa_special_sections
9890 #define elf_backend_action_discarded elf_xtensa_action_discarded
9892 #include "elf32-target.h"