1 /* Intel 80386/80486-specific support for 32-bit ELF
2 Copyright 1993, 1994, 1995, 1996, 1997, 1998, 1999, 2000, 2001, 2002,
3 2003, 2004, 2005, 2006, 2007, 2008 Free Software Foundation, Inc.
5 This file is part of BFD, the Binary File Descriptor library.
7 This program is free software; you can redistribute it and/or modify
8 it under the terms of the GNU General Public License as published by
9 the Free Software Foundation; either version 3 of the License, or
10 (at your option) any later version.
12 This program is distributed in the hope that it will be useful,
13 but WITHOUT ANY WARRANTY; without even the implied warranty of
14 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
15 GNU General Public License for more details.
17 You should have received a copy of the GNU General Public License
18 along with this program; if not, write to the Free Software
19 Foundation, Inc., 51 Franklin Street - Fifth Floor, Boston,
20 MA 02110-1301, USA. */
27 #include "elf-vxworks.h"
28 #include "bfd_stdint.h"
32 /* 386 uses REL relocations instead of RELA. */
37 static reloc_howto_type elf_howto_table
[]=
39 HOWTO(R_386_NONE
, 0, 0, 0, FALSE
, 0, complain_overflow_bitfield
,
40 bfd_elf_generic_reloc
, "R_386_NONE",
41 TRUE
, 0x00000000, 0x00000000, FALSE
),
42 HOWTO(R_386_32
, 0, 2, 32, FALSE
, 0, complain_overflow_bitfield
,
43 bfd_elf_generic_reloc
, "R_386_32",
44 TRUE
, 0xffffffff, 0xffffffff, FALSE
),
45 HOWTO(R_386_PC32
, 0, 2, 32, TRUE
, 0, complain_overflow_bitfield
,
46 bfd_elf_generic_reloc
, "R_386_PC32",
47 TRUE
, 0xffffffff, 0xffffffff, TRUE
),
48 HOWTO(R_386_GOT32
, 0, 2, 32, FALSE
, 0, complain_overflow_bitfield
,
49 bfd_elf_generic_reloc
, "R_386_GOT32",
50 TRUE
, 0xffffffff, 0xffffffff, FALSE
),
51 HOWTO(R_386_PLT32
, 0, 2, 32, TRUE
, 0, complain_overflow_bitfield
,
52 bfd_elf_generic_reloc
, "R_386_PLT32",
53 TRUE
, 0xffffffff, 0xffffffff, TRUE
),
54 HOWTO(R_386_COPY
, 0, 2, 32, FALSE
, 0, complain_overflow_bitfield
,
55 bfd_elf_generic_reloc
, "R_386_COPY",
56 TRUE
, 0xffffffff, 0xffffffff, FALSE
),
57 HOWTO(R_386_GLOB_DAT
, 0, 2, 32, FALSE
, 0, complain_overflow_bitfield
,
58 bfd_elf_generic_reloc
, "R_386_GLOB_DAT",
59 TRUE
, 0xffffffff, 0xffffffff, FALSE
),
60 HOWTO(R_386_JUMP_SLOT
, 0, 2, 32, FALSE
, 0, complain_overflow_bitfield
,
61 bfd_elf_generic_reloc
, "R_386_JUMP_SLOT",
62 TRUE
, 0xffffffff, 0xffffffff, FALSE
),
63 HOWTO(R_386_RELATIVE
, 0, 2, 32, FALSE
, 0, complain_overflow_bitfield
,
64 bfd_elf_generic_reloc
, "R_386_RELATIVE",
65 TRUE
, 0xffffffff, 0xffffffff, FALSE
),
66 HOWTO(R_386_GOTOFF
, 0, 2, 32, FALSE
, 0, complain_overflow_bitfield
,
67 bfd_elf_generic_reloc
, "R_386_GOTOFF",
68 TRUE
, 0xffffffff, 0xffffffff, FALSE
),
69 HOWTO(R_386_GOTPC
, 0, 2, 32, TRUE
, 0, complain_overflow_bitfield
,
70 bfd_elf_generic_reloc
, "R_386_GOTPC",
71 TRUE
, 0xffffffff, 0xffffffff, TRUE
),
73 /* We have a gap in the reloc numbers here.
74 R_386_standard counts the number up to this point, and
75 R_386_ext_offset is the value to subtract from a reloc type of
76 R_386_16 thru R_386_PC8 to form an index into this table. */
77 #define R_386_standard (R_386_GOTPC + 1)
78 #define R_386_ext_offset (R_386_TLS_TPOFF - R_386_standard)
80 /* These relocs are a GNU extension. */
81 HOWTO(R_386_TLS_TPOFF
, 0, 2, 32, FALSE
, 0, complain_overflow_bitfield
,
82 bfd_elf_generic_reloc
, "R_386_TLS_TPOFF",
83 TRUE
, 0xffffffff, 0xffffffff, FALSE
),
84 HOWTO(R_386_TLS_IE
, 0, 2, 32, FALSE
, 0, complain_overflow_bitfield
,
85 bfd_elf_generic_reloc
, "R_386_TLS_IE",
86 TRUE
, 0xffffffff, 0xffffffff, FALSE
),
87 HOWTO(R_386_TLS_GOTIE
, 0, 2, 32, FALSE
, 0, complain_overflow_bitfield
,
88 bfd_elf_generic_reloc
, "R_386_TLS_GOTIE",
89 TRUE
, 0xffffffff, 0xffffffff, FALSE
),
90 HOWTO(R_386_TLS_LE
, 0, 2, 32, FALSE
, 0, complain_overflow_bitfield
,
91 bfd_elf_generic_reloc
, "R_386_TLS_LE",
92 TRUE
, 0xffffffff, 0xffffffff, FALSE
),
93 HOWTO(R_386_TLS_GD
, 0, 2, 32, FALSE
, 0, complain_overflow_bitfield
,
94 bfd_elf_generic_reloc
, "R_386_TLS_GD",
95 TRUE
, 0xffffffff, 0xffffffff, FALSE
),
96 HOWTO(R_386_TLS_LDM
, 0, 2, 32, FALSE
, 0, complain_overflow_bitfield
,
97 bfd_elf_generic_reloc
, "R_386_TLS_LDM",
98 TRUE
, 0xffffffff, 0xffffffff, FALSE
),
99 HOWTO(R_386_16
, 0, 1, 16, FALSE
, 0, complain_overflow_bitfield
,
100 bfd_elf_generic_reloc
, "R_386_16",
101 TRUE
, 0xffff, 0xffff, FALSE
),
102 HOWTO(R_386_PC16
, 0, 1, 16, TRUE
, 0, complain_overflow_bitfield
,
103 bfd_elf_generic_reloc
, "R_386_PC16",
104 TRUE
, 0xffff, 0xffff, TRUE
),
105 HOWTO(R_386_8
, 0, 0, 8, FALSE
, 0, complain_overflow_bitfield
,
106 bfd_elf_generic_reloc
, "R_386_8",
107 TRUE
, 0xff, 0xff, FALSE
),
108 HOWTO(R_386_PC8
, 0, 0, 8, TRUE
, 0, complain_overflow_signed
,
109 bfd_elf_generic_reloc
, "R_386_PC8",
110 TRUE
, 0xff, 0xff, TRUE
),
112 #define R_386_ext (R_386_PC8 + 1 - R_386_ext_offset)
113 #define R_386_tls_offset (R_386_TLS_LDO_32 - R_386_ext)
114 /* These are common with Solaris TLS implementation. */
115 HOWTO(R_386_TLS_LDO_32
, 0, 2, 32, FALSE
, 0, complain_overflow_bitfield
,
116 bfd_elf_generic_reloc
, "R_386_TLS_LDO_32",
117 TRUE
, 0xffffffff, 0xffffffff, FALSE
),
118 HOWTO(R_386_TLS_IE_32
, 0, 2, 32, FALSE
, 0, complain_overflow_bitfield
,
119 bfd_elf_generic_reloc
, "R_386_TLS_IE_32",
120 TRUE
, 0xffffffff, 0xffffffff, FALSE
),
121 HOWTO(R_386_TLS_LE_32
, 0, 2, 32, FALSE
, 0, complain_overflow_bitfield
,
122 bfd_elf_generic_reloc
, "R_386_TLS_LE_32",
123 TRUE
, 0xffffffff, 0xffffffff, FALSE
),
124 HOWTO(R_386_TLS_DTPMOD32
, 0, 2, 32, FALSE
, 0, complain_overflow_bitfield
,
125 bfd_elf_generic_reloc
, "R_386_TLS_DTPMOD32",
126 TRUE
, 0xffffffff, 0xffffffff, FALSE
),
127 HOWTO(R_386_TLS_DTPOFF32
, 0, 2, 32, FALSE
, 0, complain_overflow_bitfield
,
128 bfd_elf_generic_reloc
, "R_386_TLS_DTPOFF32",
129 TRUE
, 0xffffffff, 0xffffffff, FALSE
),
130 HOWTO(R_386_TLS_TPOFF32
, 0, 2, 32, FALSE
, 0, complain_overflow_bitfield
,
131 bfd_elf_generic_reloc
, "R_386_TLS_TPOFF32",
132 TRUE
, 0xffffffff, 0xffffffff, FALSE
),
134 HOWTO(R_386_TLS_GOTDESC
, 0, 2, 32, FALSE
, 0, complain_overflow_bitfield
,
135 bfd_elf_generic_reloc
, "R_386_TLS_GOTDESC",
136 TRUE
, 0xffffffff, 0xffffffff, FALSE
),
137 HOWTO(R_386_TLS_DESC_CALL
, 0, 0, 0, FALSE
, 0, complain_overflow_dont
,
138 bfd_elf_generic_reloc
, "R_386_TLS_DESC_CALL",
140 HOWTO(R_386_TLS_DESC
, 0, 2, 32, FALSE
, 0, complain_overflow_bitfield
,
141 bfd_elf_generic_reloc
, "R_386_TLS_DESC",
142 TRUE
, 0xffffffff, 0xffffffff, FALSE
),
143 HOWTO(R_386_IRELATIVE
, 0, 2, 32, FALSE
, 0, complain_overflow_bitfield
,
144 bfd_elf_generic_reloc
, "R_386_IRELATIVE",
145 TRUE
, 0xffffffff, 0xffffffff, FALSE
),
148 #define R_386_irelative (R_386_IRELATIVE + 1 - R_386_tls_offset)
149 #define R_386_vt_offset (R_386_GNU_VTINHERIT - R_386_irelative)
151 /* GNU extension to record C++ vtable hierarchy. */
152 HOWTO (R_386_GNU_VTINHERIT
, /* type */
154 2, /* size (0 = byte, 1 = short, 2 = long) */
156 FALSE
, /* pc_relative */
158 complain_overflow_dont
, /* complain_on_overflow */
159 NULL
, /* special_function */
160 "R_386_GNU_VTINHERIT", /* name */
161 FALSE
, /* partial_inplace */
164 FALSE
), /* pcrel_offset */
166 /* GNU extension to record C++ vtable member usage. */
167 HOWTO (R_386_GNU_VTENTRY
, /* type */
169 2, /* size (0 = byte, 1 = short, 2 = long) */
171 FALSE
, /* pc_relative */
173 complain_overflow_dont
, /* complain_on_overflow */
174 _bfd_elf_rel_vtable_reloc_fn
, /* special_function */
175 "R_386_GNU_VTENTRY", /* name */
176 FALSE
, /* partial_inplace */
179 FALSE
) /* pcrel_offset */
181 #define R_386_vt (R_386_GNU_VTENTRY + 1 - R_386_vt_offset)
185 #ifdef DEBUG_GEN_RELOC
187 fprintf (stderr, "i386 bfd reloc lookup %d (%s)\n", code, str)
192 static reloc_howto_type
*
193 elf_i386_reloc_type_lookup (bfd
*abfd ATTRIBUTE_UNUSED
,
194 bfd_reloc_code_real_type code
)
199 TRACE ("BFD_RELOC_NONE");
200 return &elf_howto_table
[R_386_NONE
];
203 TRACE ("BFD_RELOC_32");
204 return &elf_howto_table
[R_386_32
];
207 TRACE ("BFD_RELOC_CTOR");
208 return &elf_howto_table
[R_386_32
];
210 case BFD_RELOC_32_PCREL
:
211 TRACE ("BFD_RELOC_PC32");
212 return &elf_howto_table
[R_386_PC32
];
214 case BFD_RELOC_386_GOT32
:
215 TRACE ("BFD_RELOC_386_GOT32");
216 return &elf_howto_table
[R_386_GOT32
];
218 case BFD_RELOC_386_PLT32
:
219 TRACE ("BFD_RELOC_386_PLT32");
220 return &elf_howto_table
[R_386_PLT32
];
222 case BFD_RELOC_386_COPY
:
223 TRACE ("BFD_RELOC_386_COPY");
224 return &elf_howto_table
[R_386_COPY
];
226 case BFD_RELOC_386_GLOB_DAT
:
227 TRACE ("BFD_RELOC_386_GLOB_DAT");
228 return &elf_howto_table
[R_386_GLOB_DAT
];
230 case BFD_RELOC_386_JUMP_SLOT
:
231 TRACE ("BFD_RELOC_386_JUMP_SLOT");
232 return &elf_howto_table
[R_386_JUMP_SLOT
];
234 case BFD_RELOC_386_RELATIVE
:
235 TRACE ("BFD_RELOC_386_RELATIVE");
236 return &elf_howto_table
[R_386_RELATIVE
];
238 case BFD_RELOC_386_GOTOFF
:
239 TRACE ("BFD_RELOC_386_GOTOFF");
240 return &elf_howto_table
[R_386_GOTOFF
];
242 case BFD_RELOC_386_GOTPC
:
243 TRACE ("BFD_RELOC_386_GOTPC");
244 return &elf_howto_table
[R_386_GOTPC
];
246 /* These relocs are a GNU extension. */
247 case BFD_RELOC_386_TLS_TPOFF
:
248 TRACE ("BFD_RELOC_386_TLS_TPOFF");
249 return &elf_howto_table
[R_386_TLS_TPOFF
- R_386_ext_offset
];
251 case BFD_RELOC_386_TLS_IE
:
252 TRACE ("BFD_RELOC_386_TLS_IE");
253 return &elf_howto_table
[R_386_TLS_IE
- R_386_ext_offset
];
255 case BFD_RELOC_386_TLS_GOTIE
:
256 TRACE ("BFD_RELOC_386_TLS_GOTIE");
257 return &elf_howto_table
[R_386_TLS_GOTIE
- R_386_ext_offset
];
259 case BFD_RELOC_386_TLS_LE
:
260 TRACE ("BFD_RELOC_386_TLS_LE");
261 return &elf_howto_table
[R_386_TLS_LE
- R_386_ext_offset
];
263 case BFD_RELOC_386_TLS_GD
:
264 TRACE ("BFD_RELOC_386_TLS_GD");
265 return &elf_howto_table
[R_386_TLS_GD
- R_386_ext_offset
];
267 case BFD_RELOC_386_TLS_LDM
:
268 TRACE ("BFD_RELOC_386_TLS_LDM");
269 return &elf_howto_table
[R_386_TLS_LDM
- R_386_ext_offset
];
272 TRACE ("BFD_RELOC_16");
273 return &elf_howto_table
[R_386_16
- R_386_ext_offset
];
275 case BFD_RELOC_16_PCREL
:
276 TRACE ("BFD_RELOC_16_PCREL");
277 return &elf_howto_table
[R_386_PC16
- R_386_ext_offset
];
280 TRACE ("BFD_RELOC_8");
281 return &elf_howto_table
[R_386_8
- R_386_ext_offset
];
283 case BFD_RELOC_8_PCREL
:
284 TRACE ("BFD_RELOC_8_PCREL");
285 return &elf_howto_table
[R_386_PC8
- R_386_ext_offset
];
287 /* Common with Sun TLS implementation. */
288 case BFD_RELOC_386_TLS_LDO_32
:
289 TRACE ("BFD_RELOC_386_TLS_LDO_32");
290 return &elf_howto_table
[R_386_TLS_LDO_32
- R_386_tls_offset
];
292 case BFD_RELOC_386_TLS_IE_32
:
293 TRACE ("BFD_RELOC_386_TLS_IE_32");
294 return &elf_howto_table
[R_386_TLS_IE_32
- R_386_tls_offset
];
296 case BFD_RELOC_386_TLS_LE_32
:
297 TRACE ("BFD_RELOC_386_TLS_LE_32");
298 return &elf_howto_table
[R_386_TLS_LE_32
- R_386_tls_offset
];
300 case BFD_RELOC_386_TLS_DTPMOD32
:
301 TRACE ("BFD_RELOC_386_TLS_DTPMOD32");
302 return &elf_howto_table
[R_386_TLS_DTPMOD32
- R_386_tls_offset
];
304 case BFD_RELOC_386_TLS_DTPOFF32
:
305 TRACE ("BFD_RELOC_386_TLS_DTPOFF32");
306 return &elf_howto_table
[R_386_TLS_DTPOFF32
- R_386_tls_offset
];
308 case BFD_RELOC_386_TLS_TPOFF32
:
309 TRACE ("BFD_RELOC_386_TLS_TPOFF32");
310 return &elf_howto_table
[R_386_TLS_TPOFF32
- R_386_tls_offset
];
312 case BFD_RELOC_386_TLS_GOTDESC
:
313 TRACE ("BFD_RELOC_386_TLS_GOTDESC");
314 return &elf_howto_table
[R_386_TLS_GOTDESC
- R_386_tls_offset
];
316 case BFD_RELOC_386_TLS_DESC_CALL
:
317 TRACE ("BFD_RELOC_386_TLS_DESC_CALL");
318 return &elf_howto_table
[R_386_TLS_DESC_CALL
- R_386_tls_offset
];
320 case BFD_RELOC_386_TLS_DESC
:
321 TRACE ("BFD_RELOC_386_TLS_DESC");
322 return &elf_howto_table
[R_386_TLS_DESC
- R_386_tls_offset
];
324 case BFD_RELOC_386_IRELATIVE
:
325 TRACE ("BFD_RELOC_386_IRELATIVE");
326 return &elf_howto_table
[R_386_IRELATIVE
];
328 case BFD_RELOC_VTABLE_INHERIT
:
329 TRACE ("BFD_RELOC_VTABLE_INHERIT");
330 return &elf_howto_table
[R_386_GNU_VTINHERIT
- R_386_vt_offset
];
332 case BFD_RELOC_VTABLE_ENTRY
:
333 TRACE ("BFD_RELOC_VTABLE_ENTRY");
334 return &elf_howto_table
[R_386_GNU_VTENTRY
- R_386_vt_offset
];
344 static reloc_howto_type
*
345 elf_i386_reloc_name_lookup (bfd
*abfd ATTRIBUTE_UNUSED
,
350 for (i
= 0; i
< sizeof (elf_howto_table
) / sizeof (elf_howto_table
[0]); i
++)
351 if (elf_howto_table
[i
].name
!= NULL
352 && strcasecmp (elf_howto_table
[i
].name
, r_name
) == 0)
353 return &elf_howto_table
[i
];
358 static reloc_howto_type
*
359 elf_i386_rtype_to_howto (bfd
*abfd
, unsigned r_type
)
363 if ((indx
= r_type
) >= R_386_standard
364 && ((indx
= r_type
- R_386_ext_offset
) - R_386_standard
365 >= R_386_ext
- R_386_standard
)
366 && ((indx
= r_type
- R_386_tls_offset
) - R_386_ext
367 >= R_386_irelative
- R_386_ext
)
368 && ((indx
= r_type
- R_386_vt_offset
) - R_386_irelative
369 >= R_386_vt
- R_386_irelative
))
371 (*_bfd_error_handler
) (_("%B: invalid relocation type %d"),
375 BFD_ASSERT (elf_howto_table
[indx
].type
== r_type
);
376 return &elf_howto_table
[indx
];
380 elf_i386_info_to_howto_rel (bfd
*abfd ATTRIBUTE_UNUSED
,
382 Elf_Internal_Rela
*dst
)
384 unsigned int r_type
= ELF32_R_TYPE (dst
->r_info
);
385 cache_ptr
->howto
= elf_i386_rtype_to_howto (abfd
, r_type
);
388 /* Return whether a symbol name implies a local label. The UnixWare
389 2.1 cc generates temporary symbols that start with .X, so we
390 recognize them here. FIXME: do other SVR4 compilers also use .X?.
391 If so, we should move the .X recognition into
392 _bfd_elf_is_local_label_name. */
395 elf_i386_is_local_label_name (bfd
*abfd
, const char *name
)
397 if (name
[0] == '.' && name
[1] == 'X')
400 return _bfd_elf_is_local_label_name (abfd
, name
);
403 /* Support for core dump NOTE sections. */
406 elf_i386_grok_prstatus (bfd
*abfd
, Elf_Internal_Note
*note
)
411 if (note
->namesz
== 8 && strcmp (note
->namedata
, "FreeBSD") == 0)
413 int pr_version
= bfd_get_32 (abfd
, note
->descdata
);
419 elf_tdata (abfd
)->core_signal
= bfd_get_32 (abfd
, note
->descdata
+ 20);
422 elf_tdata (abfd
)->core_pid
= bfd_get_32 (abfd
, note
->descdata
+ 24);
426 size
= bfd_get_32 (abfd
, note
->descdata
+ 8);
430 switch (note
->descsz
)
435 case 144: /* Linux/i386 */
437 elf_tdata (abfd
)->core_signal
= bfd_get_16 (abfd
, note
->descdata
+ 12);
440 elf_tdata (abfd
)->core_pid
= bfd_get_32 (abfd
, note
->descdata
+ 24);
450 /* Make a ".reg/999" section. */
451 return _bfd_elfcore_make_pseudosection (abfd
, ".reg",
452 size
, note
->descpos
+ offset
);
456 elf_i386_grok_psinfo (bfd
*abfd
, Elf_Internal_Note
*note
)
458 if (note
->namesz
== 8 && strcmp (note
->namedata
, "FreeBSD") == 0)
460 int pr_version
= bfd_get_32 (abfd
, note
->descdata
);
465 elf_tdata (abfd
)->core_program
466 = _bfd_elfcore_strndup (abfd
, note
->descdata
+ 8, 17);
467 elf_tdata (abfd
)->core_command
468 = _bfd_elfcore_strndup (abfd
, note
->descdata
+ 25, 81);
472 switch (note
->descsz
)
477 case 124: /* Linux/i386 elf_prpsinfo. */
478 elf_tdata (abfd
)->core_program
479 = _bfd_elfcore_strndup (abfd
, note
->descdata
+ 28, 16);
480 elf_tdata (abfd
)->core_command
481 = _bfd_elfcore_strndup (abfd
, note
->descdata
+ 44, 80);
485 /* Note that for some reason, a spurious space is tacked
486 onto the end of the args in some (at least one anyway)
487 implementations, so strip it off if it exists. */
489 char *command
= elf_tdata (abfd
)->core_command
;
490 int n
= strlen (command
);
492 if (0 < n
&& command
[n
- 1] == ' ')
493 command
[n
- 1] = '\0';
499 /* Functions for the i386 ELF linker.
501 In order to gain some understanding of code in this file without
502 knowing all the intricate details of the linker, note the
505 Functions named elf_i386_* are called by external routines, other
506 functions are only called locally. elf_i386_* functions appear
507 in this file more or less in the order in which they are called
508 from external routines. eg. elf_i386_check_relocs is called
509 early in the link process, elf_i386_finish_dynamic_sections is
510 one of the last functions. */
513 /* The name of the dynamic interpreter. This is put in the .interp
516 #define ELF_DYNAMIC_INTERPRETER "/usr/lib/libc.so.1"
518 /* If ELIMINATE_COPY_RELOCS is non-zero, the linker will try to avoid
519 copying dynamic variables from a shared lib into an app's dynbss
520 section, and instead use a dynamic relocation to point into the
522 #define ELIMINATE_COPY_RELOCS 1
524 /* The size in bytes of an entry in the procedure linkage table. */
526 #define PLT_ENTRY_SIZE 16
528 /* The first entry in an absolute procedure linkage table looks like
529 this. See the SVR4 ABI i386 supplement to see how this works.
530 Will be padded to PLT_ENTRY_SIZE with htab->plt0_pad_byte. */
532 static const bfd_byte elf_i386_plt0_entry
[12] =
534 0xff, 0x35, /* pushl contents of address */
535 0, 0, 0, 0, /* replaced with address of .got + 4. */
536 0xff, 0x25, /* jmp indirect */
537 0, 0, 0, 0 /* replaced with address of .got + 8. */
540 /* Subsequent entries in an absolute procedure linkage table look like
543 static const bfd_byte elf_i386_plt_entry
[PLT_ENTRY_SIZE
] =
545 0xff, 0x25, /* jmp indirect */
546 0, 0, 0, 0, /* replaced with address of this symbol in .got. */
547 0x68, /* pushl immediate */
548 0, 0, 0, 0, /* replaced with offset into relocation table. */
549 0xe9, /* jmp relative */
550 0, 0, 0, 0 /* replaced with offset to start of .plt. */
553 /* The first entry in a PIC procedure linkage table look like this.
554 Will be padded to PLT_ENTRY_SIZE with htab->plt0_pad_byte. */
556 static const bfd_byte elf_i386_pic_plt0_entry
[12] =
558 0xff, 0xb3, 4, 0, 0, 0, /* pushl 4(%ebx) */
559 0xff, 0xa3, 8, 0, 0, 0 /* jmp *8(%ebx) */
562 /* Subsequent entries in a PIC procedure linkage table look like this. */
564 static const bfd_byte elf_i386_pic_plt_entry
[PLT_ENTRY_SIZE
] =
566 0xff, 0xa3, /* jmp *offset(%ebx) */
567 0, 0, 0, 0, /* replaced with offset of this symbol in .got. */
568 0x68, /* pushl immediate */
569 0, 0, 0, 0, /* replaced with offset into relocation table. */
570 0xe9, /* jmp relative */
571 0, 0, 0, 0 /* replaced with offset to start of .plt. */
574 /* On VxWorks, the .rel.plt.unloaded section has absolute relocations
575 for the PLTResolve stub and then for each PLT entry. */
576 #define PLTRESOLVE_RELOCS_SHLIB 0
577 #define PLTRESOLVE_RELOCS 2
578 #define PLT_NON_JUMP_SLOT_RELOCS 2
580 /* The i386 linker needs to keep track of the number of relocs that it
581 decides to copy as dynamic relocs in check_relocs for each symbol.
582 This is so that it can later discard them if they are found to be
583 unnecessary. We store the information in a field extending the
584 regular ELF linker hash table. */
586 struct elf_i386_dyn_relocs
588 struct elf_i386_dyn_relocs
*next
;
590 /* The input section of the reloc. */
593 /* Total number of relocs copied for the input section. */
596 /* Number of pc-relative relocs copied for the input section. */
597 bfd_size_type pc_count
;
600 /* i386 ELF linker hash entry. */
602 struct elf_i386_link_hash_entry
604 struct elf_link_hash_entry elf
;
606 /* Track dynamic relocs copied for this symbol. */
607 struct elf_i386_dyn_relocs
*dyn_relocs
;
609 #define GOT_UNKNOWN 0
613 #define GOT_TLS_IE_POS 5
614 #define GOT_TLS_IE_NEG 6
615 #define GOT_TLS_IE_BOTH 7
616 #define GOT_TLS_GDESC 8
617 #define GOT_TLS_GD_BOTH_P(type) \
618 ((type) == (GOT_TLS_GD | GOT_TLS_GDESC))
619 #define GOT_TLS_GD_P(type) \
620 ((type) == GOT_TLS_GD || GOT_TLS_GD_BOTH_P (type))
621 #define GOT_TLS_GDESC_P(type) \
622 ((type) == GOT_TLS_GDESC || GOT_TLS_GD_BOTH_P (type))
623 #define GOT_TLS_GD_ANY_P(type) \
624 (GOT_TLS_GD_P (type) || GOT_TLS_GDESC_P (type))
625 unsigned char tls_type
;
627 /* Offset of the GOTPLT entry reserved for the TLS descriptor,
628 starting at the end of the jump table. */
632 #define elf_i386_hash_entry(ent) ((struct elf_i386_link_hash_entry *)(ent))
634 struct elf_i386_obj_tdata
636 struct elf_obj_tdata root
;
638 /* tls_type for each local got entry. */
639 char *local_got_tls_type
;
641 /* GOTPLT entries for TLS descriptors. */
642 bfd_vma
*local_tlsdesc_gotent
;
645 #define elf_i386_tdata(abfd) \
646 ((struct elf_i386_obj_tdata *) (abfd)->tdata.any)
648 #define elf_i386_local_got_tls_type(abfd) \
649 (elf_i386_tdata (abfd)->local_got_tls_type)
651 #define elf_i386_local_tlsdesc_gotent(abfd) \
652 (elf_i386_tdata (abfd)->local_tlsdesc_gotent)
654 #define is_i386_elf(bfd) \
655 (bfd_get_flavour (bfd) == bfd_target_elf_flavour \
656 && elf_tdata (bfd) != NULL \
657 && elf_object_id (bfd) == I386_ELF_TDATA)
660 elf_i386_mkobject (bfd
*abfd
)
662 return bfd_elf_allocate_object (abfd
, sizeof (struct elf_i386_obj_tdata
),
666 /* i386 ELF linker hash table. */
668 struct elf_i386_link_hash_table
670 struct elf_link_hash_table elf
;
672 /* Short-cuts to get to dynamic linker sections. */
685 /* The (unloaded but important) .rel.plt.unloaded section on VxWorks. */
688 /* True if the target system is VxWorks. */
691 /* Value used to fill the last word of the first plt entry. */
692 bfd_byte plt0_pad_byte
;
694 /* The index of the next unused R_386_TLS_DESC slot in .rel.plt. */
695 bfd_vma next_tls_desc_index
;
698 bfd_signed_vma refcount
;
702 /* The amount of space used by the reserved portion of the sgotplt
703 section, plus whatever space is used by the jump slots. */
704 bfd_vma sgotplt_jump_table_size
;
706 /* Small local sym to section mapping cache. */
707 struct sym_sec_cache sym_sec
;
709 /* _TLS_MODULE_BASE_ symbol. */
710 struct bfd_link_hash_entry
*tls_module_base
;
712 /* Used by local STT_GNU_IFUNC symbols. */
713 htab_t loc_hash_table
;
714 void *loc_hash_memory
;
717 /* Get the i386 ELF linker hash table from a link_info structure. */
719 #define elf_i386_hash_table(p) \
720 ((struct elf_i386_link_hash_table *) ((p)->hash))
722 #define elf_i386_compute_jump_table_size(htab) \
723 ((htab)->next_tls_desc_index * 4)
725 /* Create an entry in an i386 ELF linker hash table. */
727 static struct bfd_hash_entry
*
728 elf_i386_link_hash_newfunc (struct bfd_hash_entry
*entry
,
729 struct bfd_hash_table
*table
,
732 /* Allocate the structure if it has not already been allocated by a
736 entry
= bfd_hash_allocate (table
,
737 sizeof (struct elf_i386_link_hash_entry
));
742 /* Call the allocation method of the superclass. */
743 entry
= _bfd_elf_link_hash_newfunc (entry
, table
, string
);
746 struct elf_i386_link_hash_entry
*eh
;
748 eh
= (struct elf_i386_link_hash_entry
*) entry
;
749 eh
->dyn_relocs
= NULL
;
750 eh
->tls_type
= GOT_UNKNOWN
;
751 eh
->tlsdesc_got
= (bfd_vma
) -1;
758 elf_i386_local_hash (int id
, int r_sym
)
760 return ((((id
& 0xff) << 24) | ((id
& 0xff00) << 8))
761 ^ r_sym
^ (id
>> 16));
764 /* Compute a hash of a local hash entry. We use elf_link_hash_entry
765 for local symbol so that we can handle local STT_GNU_IFUNC symbols
766 as global symbol. We reuse indx and dynstr_index for local symbol
767 hash since they aren't used by global symbols in this backend. */
770 elf_i386_local_htab_hash (const void *ptr
)
772 struct elf_link_hash_entry
*h
773 = (struct elf_link_hash_entry
*) ptr
;
774 return elf_i386_local_hash (h
->indx
, h
->dynstr_index
);
777 /* Compare local hash entries. */
780 elf_i386_local_htab_eq (const void *ptr1
, const void *ptr2
)
782 struct elf_link_hash_entry
*h1
783 = (struct elf_link_hash_entry
*) ptr1
;
784 struct elf_link_hash_entry
*h2
785 = (struct elf_link_hash_entry
*) ptr2
;
787 return h1
->indx
== h2
->indx
&& h1
->dynstr_index
== h2
->dynstr_index
;
790 /* Find and/or create a hash entry for local symbol. */
792 static struct elf_link_hash_entry
*
793 elf_i386_get_local_sym_hash (struct elf_i386_link_hash_table
*htab
,
794 bfd
*abfd
, const Elf_Internal_Rela
*rel
,
797 struct elf_i386_link_hash_entry e
, *ret
;
798 asection
*sec
= abfd
->sections
;
799 hashval_t h
= elf_i386_local_hash (sec
->id
,
800 ELF32_R_SYM (rel
->r_info
));
803 e
.elf
.indx
= sec
->id
;
804 e
.elf
.dynstr_index
= ELF32_R_SYM (rel
->r_info
);
805 slot
= htab_find_slot_with_hash (htab
->loc_hash_table
, &e
, h
,
806 create
? INSERT
: NO_INSERT
);
813 ret
= (struct elf_i386_link_hash_entry
*) *slot
;
817 ret
= (struct elf_i386_link_hash_entry
*)
818 objalloc_alloc ((struct objalloc
*) htab
->loc_hash_memory
,
819 sizeof (struct elf_i386_link_hash_entry
));
822 memset (ret
, 0, sizeof (*ret
));
823 ret
->elf
.indx
= sec
->id
;
824 ret
->elf
.dynstr_index
= ELF32_R_SYM (rel
->r_info
);
825 ret
->elf
.dynindx
= -1;
826 ret
->elf
.plt
.offset
= (bfd_vma
) -1;
827 ret
->elf
.got
.offset
= (bfd_vma
) -1;
833 /* Create an i386 ELF linker hash table. */
835 static struct bfd_link_hash_table
*
836 elf_i386_link_hash_table_create (bfd
*abfd
)
838 struct elf_i386_link_hash_table
*ret
;
839 bfd_size_type amt
= sizeof (struct elf_i386_link_hash_table
);
841 ret
= bfd_malloc (amt
);
845 if (!_bfd_elf_link_hash_table_init (&ret
->elf
, abfd
,
846 elf_i386_link_hash_newfunc
,
847 sizeof (struct elf_i386_link_hash_entry
)))
863 ret
->irelifunc
= NULL
;
864 ret
->tls_ldm_got
.refcount
= 0;
865 ret
->next_tls_desc_index
= 0;
866 ret
->sgotplt_jump_table_size
= 0;
867 ret
->sym_sec
.abfd
= NULL
;
869 ret
->srelplt2
= NULL
;
870 ret
->plt0_pad_byte
= 0;
871 ret
->tls_module_base
= NULL
;
873 ret
->loc_hash_table
= htab_try_create (1024,
874 elf_i386_local_htab_hash
,
875 elf_i386_local_htab_eq
,
877 ret
->loc_hash_memory
= objalloc_create ();
878 if (!ret
->loc_hash_table
|| !ret
->loc_hash_memory
)
884 return &ret
->elf
.root
;
887 /* Destroy an i386 ELF linker hash table. */
890 elf_i386_link_hash_table_free (struct bfd_link_hash_table
*hash
)
892 struct elf_i386_link_hash_table
*htab
893 = (struct elf_i386_link_hash_table
*) hash
;
895 if (htab
->loc_hash_table
)
896 htab_delete (htab
->loc_hash_table
);
897 if (htab
->loc_hash_memory
)
898 objalloc_free ((struct objalloc
*) htab
->loc_hash_memory
);
899 _bfd_generic_link_hash_table_free (hash
);
902 /* Create .got, .gotplt, and .rel.got sections in DYNOBJ, and set up
903 shortcuts to them in our hash table. */
906 elf_i386_create_got_section (bfd
*dynobj
, struct bfd_link_info
*info
)
908 struct elf_i386_link_hash_table
*htab
;
910 if (! _bfd_elf_create_got_section (dynobj
, info
))
913 htab
= elf_i386_hash_table (info
);
914 htab
->sgot
= bfd_get_section_by_name (dynobj
, ".got");
915 htab
->sgotplt
= bfd_get_section_by_name (dynobj
, ".got.plt");
916 if (!htab
->sgot
|| !htab
->sgotplt
)
919 htab
->srelgot
= bfd_make_section_with_flags (dynobj
, ".rel.got",
920 (SEC_ALLOC
| SEC_LOAD
925 if (htab
->srelgot
== NULL
926 || ! bfd_set_section_alignment (dynobj
, htab
->srelgot
, 2))
931 /* Create .plt, .rel.plt, .got, .got.plt, .rel.got, .dynbss, and
932 .rel.bss sections in DYNOBJ, and set up shortcuts to them in our
936 elf_i386_create_dynamic_sections (bfd
*dynobj
, struct bfd_link_info
*info
)
938 struct elf_i386_link_hash_table
*htab
;
940 htab
= elf_i386_hash_table (info
);
941 if (!htab
->sgot
&& !elf_i386_create_got_section (dynobj
, info
))
944 if (!_bfd_elf_create_dynamic_sections (dynobj
, info
))
947 htab
->splt
= bfd_get_section_by_name (dynobj
, ".plt");
948 htab
->srelplt
= bfd_get_section_by_name (dynobj
, ".rel.plt");
949 htab
->sdynbss
= bfd_get_section_by_name (dynobj
, ".dynbss");
951 htab
->srelbss
= bfd_get_section_by_name (dynobj
, ".rel.bss");
953 if (!htab
->splt
|| !htab
->srelplt
|| !htab
->sdynbss
954 || (!info
->shared
&& !htab
->srelbss
))
958 && !elf_vxworks_create_dynamic_sections (dynobj
, info
, &htab
->srelplt2
))
964 /* Copy the extra info we tack onto an elf_link_hash_entry. */
967 elf_i386_copy_indirect_symbol (struct bfd_link_info
*info
,
968 struct elf_link_hash_entry
*dir
,
969 struct elf_link_hash_entry
*ind
)
971 struct elf_i386_link_hash_entry
*edir
, *eind
;
973 edir
= (struct elf_i386_link_hash_entry
*) dir
;
974 eind
= (struct elf_i386_link_hash_entry
*) ind
;
976 if (eind
->dyn_relocs
!= NULL
)
978 if (edir
->dyn_relocs
!= NULL
)
980 struct elf_i386_dyn_relocs
**pp
;
981 struct elf_i386_dyn_relocs
*p
;
983 /* Add reloc counts against the indirect sym to the direct sym
984 list. Merge any entries against the same section. */
985 for (pp
= &eind
->dyn_relocs
; (p
= *pp
) != NULL
; )
987 struct elf_i386_dyn_relocs
*q
;
989 for (q
= edir
->dyn_relocs
; q
!= NULL
; q
= q
->next
)
990 if (q
->sec
== p
->sec
)
992 q
->pc_count
+= p
->pc_count
;
993 q
->count
+= p
->count
;
1000 *pp
= edir
->dyn_relocs
;
1003 edir
->dyn_relocs
= eind
->dyn_relocs
;
1004 eind
->dyn_relocs
= NULL
;
1007 if (ind
->root
.type
== bfd_link_hash_indirect
1008 && dir
->got
.refcount
<= 0)
1010 edir
->tls_type
= eind
->tls_type
;
1011 eind
->tls_type
= GOT_UNKNOWN
;
1014 if (ELIMINATE_COPY_RELOCS
1015 && ind
->root
.type
!= bfd_link_hash_indirect
1016 && dir
->dynamic_adjusted
)
1018 /* If called to transfer flags for a weakdef during processing
1019 of elf_adjust_dynamic_symbol, don't copy non_got_ref.
1020 We clear it ourselves for ELIMINATE_COPY_RELOCS. */
1021 dir
->ref_dynamic
|= ind
->ref_dynamic
;
1022 dir
->ref_regular
|= ind
->ref_regular
;
1023 dir
->ref_regular_nonweak
|= ind
->ref_regular_nonweak
;
1024 dir
->needs_plt
|= ind
->needs_plt
;
1025 dir
->pointer_equality_needed
|= ind
->pointer_equality_needed
;
1028 _bfd_elf_link_hash_copy_indirect (info
, dir
, ind
);
1038 /* Return TRUE if the TLS access code sequence support transition
1042 elf_i386_check_tls_transition (bfd
*abfd
, asection
*sec
,
1044 Elf_Internal_Shdr
*symtab_hdr
,
1045 struct elf_link_hash_entry
**sym_hashes
,
1046 unsigned int r_type
,
1047 const Elf_Internal_Rela
*rel
,
1048 const Elf_Internal_Rela
*relend
)
1050 unsigned int val
, type
;
1051 unsigned long r_symndx
;
1052 struct elf_link_hash_entry
*h
;
1055 /* Get the section contents. */
1056 if (contents
== NULL
)
1058 if (elf_section_data (sec
)->this_hdr
.contents
!= NULL
)
1059 contents
= elf_section_data (sec
)->this_hdr
.contents
;
1062 /* FIXME: How to better handle error condition? */
1063 if (!bfd_malloc_and_get_section (abfd
, sec
, &contents
))
1066 /* Cache the section contents for elf_link_input_bfd. */
1067 elf_section_data (sec
)->this_hdr
.contents
= contents
;
1071 offset
= rel
->r_offset
;
1076 if (offset
< 2 || (rel
+ 1) >= relend
)
1079 type
= bfd_get_8 (abfd
, contents
+ offset
- 2);
1080 if (r_type
== R_386_TLS_GD
)
1082 /* Check transition from GD access model. Only
1083 leal foo@tlsgd(,%reg,1), %eax; call ___tls_get_addr
1084 leal foo@tlsgd(%reg), %eax; call ___tls_get_addr; nop
1085 can transit to different access model. */
1086 if ((offset
+ 10) > sec
->size
||
1087 (type
!= 0x8d && type
!= 0x04))
1090 val
= bfd_get_8 (abfd
, contents
+ offset
- 1);
1093 /* leal foo@tlsgd(,%reg,1), %eax; call ___tls_get_addr */
1097 if (bfd_get_8 (abfd
, contents
+ offset
- 3) != 0x8d)
1100 if ((val
& 0xc7) != 0x05 || val
== (4 << 3))
1105 /* leal foo@tlsgd(%reg), %eax; call ___tls_get_addr; nop */
1106 if ((val
& 0xf8) != 0x80 || (val
& 7) == 4)
1109 if (bfd_get_8 (abfd
, contents
+ offset
+ 9) != 0x90)
1115 /* Check transition from LD access model. Only
1116 leal foo@tlsgd(%reg), %eax; call ___tls_get_addr
1117 can transit to different access model. */
1118 if (type
!= 0x8d || (offset
+ 9) > sec
->size
)
1121 val
= bfd_get_8 (abfd
, contents
+ offset
- 1);
1122 if ((val
& 0xf8) != 0x80 || (val
& 7) == 4)
1126 if (bfd_get_8 (abfd
, contents
+ offset
+ 4) != 0xe8)
1129 r_symndx
= ELF32_R_SYM (rel
[1].r_info
);
1130 if (r_symndx
< symtab_hdr
->sh_info
)
1133 h
= sym_hashes
[r_symndx
- symtab_hdr
->sh_info
];
1134 /* Use strncmp to check ___tls_get_addr since ___tls_get_addr
1135 may be versioned. */
1137 && h
->root
.root
.string
!= NULL
1138 && (ELF32_R_TYPE (rel
[1].r_info
) == R_386_PC32
1139 || ELF32_R_TYPE (rel
[1].r_info
) == R_386_PLT32
)
1140 && (strncmp (h
->root
.root
.string
, "___tls_get_addr",
1144 /* Check transition from IE access model:
1145 movl foo@indntpoff(%rip), %eax
1146 movl foo@indntpoff(%rip), %reg
1147 addl foo@indntpoff(%rip), %reg
1150 if (offset
< 1 || (offset
+ 4) > sec
->size
)
1153 /* Check "movl foo@tpoff(%rip), %eax" first. */
1154 val
= bfd_get_8 (abfd
, contents
+ offset
- 1);
1161 /* Check movl|addl foo@tpoff(%rip), %reg. */
1162 type
= bfd_get_8 (abfd
, contents
+ offset
- 2);
1163 return ((type
== 0x8b || type
== 0x03)
1164 && (val
& 0xc7) == 0x05);
1166 case R_386_TLS_GOTIE
:
1167 case R_386_TLS_IE_32
:
1168 /* Check transition from {IE_32,GOTIE} access model:
1169 subl foo@{tpoff,gontoff}(%reg1), %reg2
1170 movl foo@{tpoff,gontoff}(%reg1), %reg2
1171 addl foo@{tpoff,gontoff}(%reg1), %reg2
1174 if (offset
< 2 || (offset
+ 4) > sec
->size
)
1177 val
= bfd_get_8 (abfd
, contents
+ offset
- 1);
1178 if ((val
& 0xc0) != 0x80 || (val
& 7) == 4)
1181 type
= bfd_get_8 (abfd
, contents
+ offset
- 2);
1182 return type
== 0x8b || type
== 0x2b || type
== 0x03;
1184 case R_386_TLS_GOTDESC
:
1185 /* Check transition from GDesc access model:
1186 leal x@tlsdesc(%ebx), %eax
1188 Make sure it's a leal adding ebx to a 32-bit offset
1189 into any register, although it's probably almost always
1192 if (offset
< 2 || (offset
+ 4) > sec
->size
)
1195 if (bfd_get_8 (abfd
, contents
+ offset
- 2) != 0x8d)
1198 val
= bfd_get_8 (abfd
, contents
+ offset
- 1);
1199 return (val
& 0xc7) == 0x83;
1201 case R_386_TLS_DESC_CALL
:
1202 /* Check transition from GDesc access model:
1203 call *x@tlsdesc(%rax)
1205 if (offset
+ 2 <= sec
->size
)
1207 /* Make sure that it's a call *x@tlsdesc(%rax). */
1208 static i386_opcode16 call
= { { 0xff, 0x10 } };
1209 return bfd_get_16 (abfd
, contents
+ offset
) == call
.i
;
1219 /* Return TRUE if the TLS access transition is OK or no transition
1220 will be performed. Update R_TYPE if there is a transition. */
1223 elf_i386_tls_transition (struct bfd_link_info
*info
, bfd
*abfd
,
1224 asection
*sec
, bfd_byte
*contents
,
1225 Elf_Internal_Shdr
*symtab_hdr
,
1226 struct elf_link_hash_entry
**sym_hashes
,
1227 unsigned int *r_type
, int tls_type
,
1228 const Elf_Internal_Rela
*rel
,
1229 const Elf_Internal_Rela
*relend
,
1230 struct elf_link_hash_entry
*h
)
1232 unsigned int from_type
= *r_type
;
1233 unsigned int to_type
= from_type
;
1234 bfd_boolean check
= TRUE
;
1239 case R_386_TLS_GOTDESC
:
1240 case R_386_TLS_DESC_CALL
:
1241 case R_386_TLS_IE_32
:
1243 case R_386_TLS_GOTIE
:
1247 to_type
= R_386_TLS_LE_32
;
1248 else if (from_type
!= R_386_TLS_IE
1249 && from_type
!= R_386_TLS_GOTIE
)
1250 to_type
= R_386_TLS_IE_32
;
1253 /* When we are called from elf_i386_relocate_section, CONTENTS
1254 isn't NULL and there may be additional transitions based on
1256 if (contents
!= NULL
)
1258 unsigned int new_to_type
= to_type
;
1263 && (tls_type
& GOT_TLS_IE
))
1264 new_to_type
= R_386_TLS_LE_32
;
1266 if (to_type
== R_386_TLS_GD
1267 || to_type
== R_386_TLS_GOTDESC
1268 || to_type
== R_386_TLS_DESC_CALL
)
1270 if (tls_type
== GOT_TLS_IE_POS
)
1271 new_to_type
= R_386_TLS_GOTIE
;
1272 else if (tls_type
& GOT_TLS_IE
)
1273 new_to_type
= R_386_TLS_IE_32
;
1276 /* We checked the transition before when we were called from
1277 elf_i386_check_relocs. We only want to check the new
1278 transition which hasn't been checked before. */
1279 check
= new_to_type
!= to_type
&& from_type
== to_type
;
1280 to_type
= new_to_type
;
1287 to_type
= R_386_TLS_LE_32
;
1294 /* Return TRUE if there is no transition. */
1295 if (from_type
== to_type
)
1298 /* Check if the transition can be performed. */
1300 && ! elf_i386_check_tls_transition (abfd
, sec
, contents
,
1301 symtab_hdr
, sym_hashes
,
1302 from_type
, rel
, relend
))
1304 reloc_howto_type
*from
, *to
;
1306 from
= elf_i386_rtype_to_howto (abfd
, from_type
);
1307 to
= elf_i386_rtype_to_howto (abfd
, to_type
);
1309 (*_bfd_error_handler
)
1310 (_("%B: TLS transition from %s to %s against `%s' at 0x%lx "
1311 "in section `%A' failed"),
1312 abfd
, sec
, from
->name
, to
->name
,
1313 h
? h
->root
.root
.string
: "a local symbol",
1314 (unsigned long) rel
->r_offset
);
1315 bfd_set_error (bfd_error_bad_value
);
1323 /* Look through the relocs for a section during the first phase, and
1324 calculate needed space in the global offset table, procedure linkage
1325 table, and dynamic reloc sections. */
1328 elf_i386_check_relocs (bfd
*abfd
,
1329 struct bfd_link_info
*info
,
1331 const Elf_Internal_Rela
*relocs
)
1333 struct elf_i386_link_hash_table
*htab
;
1334 Elf_Internal_Shdr
*symtab_hdr
;
1335 struct elf_link_hash_entry
**sym_hashes
;
1336 const Elf_Internal_Rela
*rel
;
1337 const Elf_Internal_Rela
*rel_end
;
1339 Elf_Internal_Sym
*isymbuf
;
1341 if (info
->relocatable
)
1344 BFD_ASSERT (is_i386_elf (abfd
));
1346 htab
= elf_i386_hash_table (info
);
1347 symtab_hdr
= &elf_symtab_hdr (abfd
);
1348 isymbuf
= (Elf_Internal_Sym
*) symtab_hdr
->contents
;
1349 sym_hashes
= elf_sym_hashes (abfd
);
1353 rel_end
= relocs
+ sec
->reloc_count
;
1354 for (rel
= relocs
; rel
< rel_end
; rel
++)
1356 unsigned int r_type
;
1357 unsigned long r_symndx
;
1358 struct elf_link_hash_entry
*h
;
1360 r_symndx
= ELF32_R_SYM (rel
->r_info
);
1361 r_type
= ELF32_R_TYPE (rel
->r_info
);
1363 if (r_symndx
>= NUM_SHDR_ENTRIES (symtab_hdr
))
1365 (*_bfd_error_handler
) (_("%B: bad symbol index: %d"),
1371 if (r_symndx
< symtab_hdr
->sh_info
)
1373 /* A local symbol. */
1374 Elf_Internal_Sym
*isym
;
1376 /* Read this BFD's local symbols. */
1377 if (isymbuf
== NULL
)
1379 if (isymbuf
== NULL
)
1380 isymbuf
= bfd_elf_get_elf_syms (abfd
, symtab_hdr
,
1381 symtab_hdr
->sh_info
, 0,
1383 if (isymbuf
== NULL
)
1387 /* Check relocation against local STT_GNU_IFUNC symbol. */
1388 isym
= isymbuf
+ r_symndx
;
1389 if (ELF32_ST_TYPE (isym
->st_info
) == STT_GNU_IFUNC
)
1391 h
= elf_i386_get_local_sym_hash (htab
, abfd
, rel
,
1396 /* Fake a STT_GNU_IFUNC symbol. */
1397 h
->type
= STT_GNU_IFUNC
;
1400 h
->forced_local
= 1;
1401 h
->root
.type
= bfd_link_hash_defined
;
1408 h
= sym_hashes
[r_symndx
- symtab_hdr
->sh_info
];
1409 while (h
->root
.type
== bfd_link_hash_indirect
1410 || h
->root
.type
== bfd_link_hash_warning
)
1411 h
= (struct elf_link_hash_entry
*) h
->root
.u
.i
.link
;
1416 /* Create the ifunc sections for static executables. If we
1417 never see an indirect function symbol nor we are building
1418 a static executable, those sections will be empty and
1419 won't appear in output. */
1430 if (htab
->irelifunc
== NULL
&& htab
->iplt
== NULL
)
1432 if (!_bfd_elf_create_ifunc_sections (abfd
, info
))
1437 htab
->irelifunc
= bfd_get_section_by_name (abfd
,
1439 if (!htab
->irelifunc
)
1444 htab
->iplt
= bfd_get_section_by_name (abfd
, ".iplt");
1445 htab
->irelplt
= bfd_get_section_by_name (abfd
,
1447 htab
->igotplt
= bfd_get_section_by_name (abfd
,
1458 /* Since STT_GNU_IFUNC symbol must go through PLT, we handle
1459 it here if it is defined in a non-shared object. */
1460 if (h
->type
== STT_GNU_IFUNC
1463 /* It is referenced by a non-shared object. */
1466 /* STT_GNU_IFUNC symbol must go through PLT. */
1467 h
->plt
.refcount
+= 1;
1469 /* STT_GNU_IFUNC needs dynamic sections. */
1470 if (htab
->elf
.dynobj
== NULL
)
1471 htab
->elf
.dynobj
= abfd
;
1476 (*_bfd_error_handler
)
1477 (_("%B: relocation %s against STT_GNU_IFUNC "
1478 "symbol `%s' isn't handled by %s"), abfd
,
1479 elf_howto_table
[r_type
].name
,
1480 (h
->root
.root
.string
1481 ? h
->root
.root
.string
: "a local symbol"),
1483 bfd_set_error (bfd_error_bad_value
);
1488 h
->pointer_equality_needed
= 1;
1491 struct elf_i386_dyn_relocs
*p
;
1492 struct elf_i386_dyn_relocs
**head
;
1494 /* We must copy these reloc types into the
1495 output file. Create a reloc section in
1496 dynobj and make room for this reloc. */
1499 if (htab
->elf
.dynobj
== NULL
)
1500 htab
->elf
.dynobj
= abfd
;
1502 sreloc
= _bfd_elf_make_dynamic_reloc_section
1503 (sec
, htab
->elf
.dynobj
, 2, abfd
, FALSE
);
1509 head
= &((struct elf_i386_link_hash_entry
*) h
)->dyn_relocs
;
1511 if (p
== NULL
|| p
->sec
!= sec
)
1513 bfd_size_type amt
= sizeof *p
;
1514 p
= bfd_alloc (htab
->elf
.dynobj
, amt
);
1536 h
->got
.refcount
+= 1;
1537 if (htab
->sgot
== NULL
1538 && !elf_i386_create_got_section (htab
->elf
.dynobj
,
1548 if (! elf_i386_tls_transition (info
, abfd
, sec
, NULL
,
1549 symtab_hdr
, sym_hashes
,
1550 &r_type
, GOT_UNKNOWN
,
1557 htab
->tls_ldm_got
.refcount
+= 1;
1561 /* This symbol requires a procedure linkage table entry. We
1562 actually build the entry in adjust_dynamic_symbol,
1563 because this might be a case of linking PIC code which is
1564 never referenced by a dynamic object, in which case we
1565 don't need to generate a procedure linkage table entry
1568 /* If this is a local symbol, we resolve it directly without
1569 creating a procedure linkage table entry. */
1574 h
->plt
.refcount
+= 1;
1577 case R_386_TLS_IE_32
:
1579 case R_386_TLS_GOTIE
:
1581 info
->flags
|= DF_STATIC_TLS
;
1586 case R_386_TLS_GOTDESC
:
1587 case R_386_TLS_DESC_CALL
:
1588 /* This symbol requires a global offset table entry. */
1590 int tls_type
, old_tls_type
;
1595 case R_386_GOT32
: tls_type
= GOT_NORMAL
; break;
1596 case R_386_TLS_GD
: tls_type
= GOT_TLS_GD
; break;
1597 case R_386_TLS_GOTDESC
:
1598 case R_386_TLS_DESC_CALL
:
1599 tls_type
= GOT_TLS_GDESC
; break;
1600 case R_386_TLS_IE_32
:
1601 if (ELF32_R_TYPE (rel
->r_info
) == r_type
)
1602 tls_type
= GOT_TLS_IE_NEG
;
1604 /* If this is a GD->IE transition, we may use either of
1605 R_386_TLS_TPOFF and R_386_TLS_TPOFF32. */
1606 tls_type
= GOT_TLS_IE
;
1609 case R_386_TLS_GOTIE
:
1610 tls_type
= GOT_TLS_IE_POS
; break;
1615 h
->got
.refcount
+= 1;
1616 old_tls_type
= elf_i386_hash_entry(h
)->tls_type
;
1620 bfd_signed_vma
*local_got_refcounts
;
1622 /* This is a global offset table entry for a local symbol. */
1623 local_got_refcounts
= elf_local_got_refcounts (abfd
);
1624 if (local_got_refcounts
== NULL
)
1628 size
= symtab_hdr
->sh_info
;
1629 size
*= (sizeof (bfd_signed_vma
)
1630 + sizeof (bfd_vma
) + sizeof(char));
1631 local_got_refcounts
= bfd_zalloc (abfd
, size
);
1632 if (local_got_refcounts
== NULL
)
1634 elf_local_got_refcounts (abfd
) = local_got_refcounts
;
1635 elf_i386_local_tlsdesc_gotent (abfd
)
1636 = (bfd_vma
*) (local_got_refcounts
+ symtab_hdr
->sh_info
);
1637 elf_i386_local_got_tls_type (abfd
)
1638 = (char *) (local_got_refcounts
+ 2 * symtab_hdr
->sh_info
);
1640 local_got_refcounts
[r_symndx
] += 1;
1641 old_tls_type
= elf_i386_local_got_tls_type (abfd
) [r_symndx
];
1644 if ((old_tls_type
& GOT_TLS_IE
) && (tls_type
& GOT_TLS_IE
))
1645 tls_type
|= old_tls_type
;
1646 /* If a TLS symbol is accessed using IE at least once,
1647 there is no point to use dynamic model for it. */
1648 else if (old_tls_type
!= tls_type
&& old_tls_type
!= GOT_UNKNOWN
1649 && (! GOT_TLS_GD_ANY_P (old_tls_type
)
1650 || (tls_type
& GOT_TLS_IE
) == 0))
1652 if ((old_tls_type
& GOT_TLS_IE
) && GOT_TLS_GD_ANY_P (tls_type
))
1653 tls_type
= old_tls_type
;
1654 else if (GOT_TLS_GD_ANY_P (old_tls_type
)
1655 && GOT_TLS_GD_ANY_P (tls_type
))
1656 tls_type
|= old_tls_type
;
1659 (*_bfd_error_handler
)
1660 (_("%B: `%s' accessed both as normal and "
1661 "thread local symbol"),
1663 h
? h
->root
.root
.string
: "<local>");
1668 if (old_tls_type
!= tls_type
)
1671 elf_i386_hash_entry (h
)->tls_type
= tls_type
;
1673 elf_i386_local_got_tls_type (abfd
) [r_symndx
] = tls_type
;
1681 if (htab
->sgot
== NULL
)
1683 if (htab
->elf
.dynobj
== NULL
)
1684 htab
->elf
.dynobj
= abfd
;
1685 if (!elf_i386_create_got_section (htab
->elf
.dynobj
, info
))
1688 if (r_type
!= R_386_TLS_IE
)
1692 case R_386_TLS_LE_32
:
1696 info
->flags
|= DF_STATIC_TLS
;
1701 if (h
!= NULL
&& info
->executable
)
1703 /* If this reloc is in a read-only section, we might
1704 need a copy reloc. We can't check reliably at this
1705 stage whether the section is read-only, as input
1706 sections have not yet been mapped to output sections.
1707 Tentatively set the flag for now, and correct in
1708 adjust_dynamic_symbol. */
1711 /* We may need a .plt entry if the function this reloc
1712 refers to is in a shared lib. */
1713 h
->plt
.refcount
+= 1;
1714 if (r_type
!= R_386_PC32
)
1715 h
->pointer_equality_needed
= 1;
1718 /* If we are creating a shared library, and this is a reloc
1719 against a global symbol, or a non PC relative reloc
1720 against a local symbol, then we need to copy the reloc
1721 into the shared library. However, if we are linking with
1722 -Bsymbolic, we do not need to copy a reloc against a
1723 global symbol which is defined in an object we are
1724 including in the link (i.e., DEF_REGULAR is set). At
1725 this point we have not seen all the input files, so it is
1726 possible that DEF_REGULAR is not set now but will be set
1727 later (it is never cleared). In case of a weak definition,
1728 DEF_REGULAR may be cleared later by a strong definition in
1729 a shared library. We account for that possibility below by
1730 storing information in the relocs_copied field of the hash
1731 table entry. A similar situation occurs when creating
1732 shared libraries and symbol visibility changes render the
1735 If on the other hand, we are creating an executable, we
1736 may need to keep relocations for symbols satisfied by a
1737 dynamic library if we manage to avoid copy relocs for the
1740 && (sec
->flags
& SEC_ALLOC
) != 0
1741 && (r_type
!= R_386_PC32
1743 && (! SYMBOLIC_BIND (info
, h
)
1744 || h
->root
.type
== bfd_link_hash_defweak
1745 || !h
->def_regular
))))
1746 || (ELIMINATE_COPY_RELOCS
1748 && (sec
->flags
& SEC_ALLOC
) != 0
1750 && (h
->root
.type
== bfd_link_hash_defweak
1751 || !h
->def_regular
)))
1753 struct elf_i386_dyn_relocs
*p
;
1754 struct elf_i386_dyn_relocs
**head
;
1756 /* We must copy these reloc types into the output file.
1757 Create a reloc section in dynobj and make room for
1761 if (htab
->elf
.dynobj
== NULL
)
1762 htab
->elf
.dynobj
= abfd
;
1764 sreloc
= _bfd_elf_make_dynamic_reloc_section
1765 (sec
, htab
->elf
.dynobj
, 2, abfd
, /*rela?*/ FALSE
);
1771 /* If this is a global symbol, we count the number of
1772 relocations we need for this symbol. */
1775 head
= &((struct elf_i386_link_hash_entry
*) h
)->dyn_relocs
;
1780 /* Track dynamic relocs needed for local syms too.
1781 We really need local syms available to do this
1785 s
= bfd_section_from_r_symndx (abfd
, &htab
->sym_sec
,
1790 vpp
= &elf_section_data (s
)->local_dynrel
;
1791 head
= (struct elf_i386_dyn_relocs
**)vpp
;
1795 if (p
== NULL
|| p
->sec
!= sec
)
1797 bfd_size_type amt
= sizeof *p
;
1798 p
= bfd_alloc (htab
->elf
.dynobj
, amt
);
1809 if (r_type
== R_386_PC32
)
1814 /* This relocation describes the C++ object vtable hierarchy.
1815 Reconstruct it for later use during GC. */
1816 case R_386_GNU_VTINHERIT
:
1817 if (!bfd_elf_gc_record_vtinherit (abfd
, sec
, h
, rel
->r_offset
))
1821 /* This relocation describes which C++ vtable entries are actually
1822 used. Record for later use during GC. */
1823 case R_386_GNU_VTENTRY
:
1824 BFD_ASSERT (h
!= NULL
);
1826 && !bfd_elf_gc_record_vtentry (abfd
, sec
, h
, rel
->r_offset
))
1838 /* Return the section that should be marked against GC for a given
1842 elf_i386_gc_mark_hook (asection
*sec
,
1843 struct bfd_link_info
*info
,
1844 Elf_Internal_Rela
*rel
,
1845 struct elf_link_hash_entry
*h
,
1846 Elf_Internal_Sym
*sym
)
1849 switch (ELF32_R_TYPE (rel
->r_info
))
1851 case R_386_GNU_VTINHERIT
:
1852 case R_386_GNU_VTENTRY
:
1856 return _bfd_elf_gc_mark_hook (sec
, info
, rel
, h
, sym
);
1859 /* Update the got entry reference counts for the section being removed. */
1862 elf_i386_gc_sweep_hook (bfd
*abfd
,
1863 struct bfd_link_info
*info
,
1865 const Elf_Internal_Rela
*relocs
)
1867 Elf_Internal_Shdr
*symtab_hdr
;
1868 struct elf_link_hash_entry
**sym_hashes
;
1869 bfd_signed_vma
*local_got_refcounts
;
1870 const Elf_Internal_Rela
*rel
, *relend
;
1872 if (info
->relocatable
)
1875 elf_section_data (sec
)->local_dynrel
= NULL
;
1877 symtab_hdr
= &elf_symtab_hdr (abfd
);
1878 sym_hashes
= elf_sym_hashes (abfd
);
1879 local_got_refcounts
= elf_local_got_refcounts (abfd
);
1881 relend
= relocs
+ sec
->reloc_count
;
1882 for (rel
= relocs
; rel
< relend
; rel
++)
1884 unsigned long r_symndx
;
1885 unsigned int r_type
;
1886 struct elf_link_hash_entry
*h
= NULL
;
1888 r_symndx
= ELF32_R_SYM (rel
->r_info
);
1889 if (r_symndx
>= symtab_hdr
->sh_info
)
1891 struct elf_i386_link_hash_entry
*eh
;
1892 struct elf_i386_dyn_relocs
**pp
;
1893 struct elf_i386_dyn_relocs
*p
;
1895 h
= sym_hashes
[r_symndx
- symtab_hdr
->sh_info
];
1896 while (h
->root
.type
== bfd_link_hash_indirect
1897 || h
->root
.type
== bfd_link_hash_warning
)
1898 h
= (struct elf_link_hash_entry
*) h
->root
.u
.i
.link
;
1899 eh
= (struct elf_i386_link_hash_entry
*) h
;
1901 for (pp
= &eh
->dyn_relocs
; (p
= *pp
) != NULL
; pp
= &p
->next
)
1904 /* Everything must go for SEC. */
1910 r_type
= ELF32_R_TYPE (rel
->r_info
);
1911 if (! elf_i386_tls_transition (info
, abfd
, sec
, NULL
,
1912 symtab_hdr
, sym_hashes
,
1913 &r_type
, GOT_UNKNOWN
,
1920 if (elf_i386_hash_table (info
)->tls_ldm_got
.refcount
> 0)
1921 elf_i386_hash_table (info
)->tls_ldm_got
.refcount
-= 1;
1925 case R_386_TLS_GOTDESC
:
1926 case R_386_TLS_DESC_CALL
:
1927 case R_386_TLS_IE_32
:
1929 case R_386_TLS_GOTIE
:
1933 if (h
->got
.refcount
> 0)
1934 h
->got
.refcount
-= 1;
1936 else if (local_got_refcounts
!= NULL
)
1938 if (local_got_refcounts
[r_symndx
] > 0)
1939 local_got_refcounts
[r_symndx
] -= 1;
1952 if (h
->plt
.refcount
> 0)
1953 h
->plt
.refcount
-= 1;
1965 /* Adjust a symbol defined by a dynamic object and referenced by a
1966 regular object. The current definition is in some section of the
1967 dynamic object, but we're not including those sections. We have to
1968 change the definition to something the rest of the link can
1972 elf_i386_adjust_dynamic_symbol (struct bfd_link_info
*info
,
1973 struct elf_link_hash_entry
*h
)
1975 struct elf_i386_link_hash_table
*htab
;
1978 /* STT_GNU_IFUNC symbol must go through PLT. */
1979 if (h
->type
== STT_GNU_IFUNC
)
1981 if (h
->plt
.refcount
<= 0)
1983 h
->plt
.offset
= (bfd_vma
) -1;
1989 /* If this is a function, put it in the procedure linkage table. We
1990 will fill in the contents of the procedure linkage table later,
1991 when we know the address of the .got section. */
1992 if (h
->type
== STT_FUNC
1995 if (h
->plt
.refcount
<= 0
1996 || SYMBOL_CALLS_LOCAL (info
, h
)
1997 || (ELF_ST_VISIBILITY (h
->other
) != STV_DEFAULT
1998 && h
->root
.type
== bfd_link_hash_undefweak
))
2000 /* This case can occur if we saw a PLT32 reloc in an input
2001 file, but the symbol was never referred to by a dynamic
2002 object, or if all references were garbage collected. In
2003 such a case, we don't actually need to build a procedure
2004 linkage table, and we can just do a PC32 reloc instead. */
2005 h
->plt
.offset
= (bfd_vma
) -1;
2012 /* It's possible that we incorrectly decided a .plt reloc was
2013 needed for an R_386_PC32 reloc to a non-function sym in
2014 check_relocs. We can't decide accurately between function and
2015 non-function syms in check-relocs; Objects loaded later in
2016 the link may change h->type. So fix it now. */
2017 h
->plt
.offset
= (bfd_vma
) -1;
2019 /* If this is a weak symbol, and there is a real definition, the
2020 processor independent code will have arranged for us to see the
2021 real definition first, and we can just use the same value. */
2022 if (h
->u
.weakdef
!= NULL
)
2024 BFD_ASSERT (h
->u
.weakdef
->root
.type
== bfd_link_hash_defined
2025 || h
->u
.weakdef
->root
.type
== bfd_link_hash_defweak
);
2026 h
->root
.u
.def
.section
= h
->u
.weakdef
->root
.u
.def
.section
;
2027 h
->root
.u
.def
.value
= h
->u
.weakdef
->root
.u
.def
.value
;
2028 if (ELIMINATE_COPY_RELOCS
|| info
->nocopyreloc
)
2029 h
->non_got_ref
= h
->u
.weakdef
->non_got_ref
;
2033 /* This is a reference to a symbol defined by a dynamic object which
2034 is not a function. */
2036 /* If we are creating a shared library, we must presume that the
2037 only references to the symbol are via the global offset table.
2038 For such cases we need not do anything here; the relocations will
2039 be handled correctly by relocate_section. */
2043 /* If there are no references to this symbol that do not use the
2044 GOT, we don't need to generate a copy reloc. */
2045 if (!h
->non_got_ref
)
2048 /* If -z nocopyreloc was given, we won't generate them either. */
2049 if (info
->nocopyreloc
)
2055 htab
= elf_i386_hash_table (info
);
2057 /* If there aren't any dynamic relocs in read-only sections, then
2058 we can keep the dynamic relocs and avoid the copy reloc. This
2059 doesn't work on VxWorks, where we can not have dynamic relocations
2060 (other than copy and jump slot relocations) in an executable. */
2061 if (ELIMINATE_COPY_RELOCS
&& !htab
->is_vxworks
)
2063 struct elf_i386_link_hash_entry
* eh
;
2064 struct elf_i386_dyn_relocs
*p
;
2066 eh
= (struct elf_i386_link_hash_entry
*) h
;
2067 for (p
= eh
->dyn_relocs
; p
!= NULL
; p
= p
->next
)
2069 s
= p
->sec
->output_section
;
2070 if (s
!= NULL
&& (s
->flags
& SEC_READONLY
) != 0)
2083 (*_bfd_error_handler
) (_("dynamic variable `%s' is zero size"),
2084 h
->root
.root
.string
);
2088 /* We must allocate the symbol in our .dynbss section, which will
2089 become part of the .bss section of the executable. There will be
2090 an entry for this symbol in the .dynsym section. The dynamic
2091 object will contain position independent code, so all references
2092 from the dynamic object to this symbol will go through the global
2093 offset table. The dynamic linker will use the .dynsym entry to
2094 determine the address it must put in the global offset table, so
2095 both the dynamic object and the regular object will refer to the
2096 same memory location for the variable. */
2098 /* We must generate a R_386_COPY reloc to tell the dynamic linker to
2099 copy the initial value out of the dynamic object and into the
2100 runtime process image. */
2101 if ((h
->root
.u
.def
.section
->flags
& SEC_ALLOC
) != 0)
2103 htab
->srelbss
->size
+= sizeof (Elf32_External_Rel
);
2109 return _bfd_elf_adjust_dynamic_copy (h
, s
);
2112 /* Allocate space in .plt, .got and associated reloc sections for
2116 elf_i386_allocate_dynrelocs (struct elf_link_hash_entry
*h
, void *inf
)
2118 struct bfd_link_info
*info
;
2119 struct elf_i386_link_hash_table
*htab
;
2120 struct elf_i386_link_hash_entry
*eh
;
2121 struct elf_i386_dyn_relocs
*p
;
2123 if (h
->root
.type
== bfd_link_hash_indirect
)
2126 if (h
->root
.type
== bfd_link_hash_warning
)
2127 /* When warning symbols are created, they **replace** the "real"
2128 entry in the hash table, thus we never get to see the real
2129 symbol in a hash traversal. So look at it now. */
2130 h
= (struct elf_link_hash_entry
*) h
->root
.u
.i
.link
;
2131 eh
= (struct elf_i386_link_hash_entry
*) h
;
2133 info
= (struct bfd_link_info
*) inf
;
2134 htab
= elf_i386_hash_table (info
);
2136 /* Since STT_GNU_IFUNC symbol must go through PLT, we handle it
2137 here if it is defined and referenced in a non-shared object. */
2138 if (h
->type
== STT_GNU_IFUNC
2141 asection
*plt
, *gotplt
, *relplt
;
2143 /* When a shared library references a STT_GNU_IFUNC symbol
2144 defined in executable. the .got.plt slot in the shared library
2145 will contain address of the .plt slot in the binary and only
2146 its .got.plt will contain the resolved function that should be
2147 called. Pointer equality won't work correctly. PIE should
2148 be used if pointer equality is required here. */
2150 && (h
->dynindx
!= -1
2151 || info
->export_dynamic
)
2152 && h
->pointer_equality_needed
)
2154 info
->callbacks
->einfo
2155 (_("%F%P: dynamic STT_GNU_IFUNC symbol `%s' with pointer "
2156 "equality in `%B' can not be used when making an "
2157 "executable; recompile with -fPIE and relink with -pie\n"),
2158 h
->root
.root
.string
,
2159 h
->root
.u
.def
.section
->owner
);
2160 bfd_set_error (bfd_error_bad_value
);
2164 /* Return and discard space for dynamic relocations against it if
2165 it is never referenced in a non-shared object. */
2166 if (!h
->ref_regular
)
2168 if (h
->plt
.refcount
> 0
2169 || h
->got
.refcount
> 0)
2171 h
->got
.offset
= (bfd_vma
) -1;
2172 eh
->dyn_relocs
= NULL
;
2176 /* When building a static executable, use .iplt, .igot.plt and
2177 .rel.iplt sections for STT_GNU_IFUNC symbols. */
2178 if (htab
->splt
!= NULL
)
2181 gotplt
= htab
->sgotplt
;
2182 relplt
= htab
->srelplt
;
2184 /* If this is the first .plt entry, make room for the special
2187 plt
->size
+= PLT_ENTRY_SIZE
;
2192 gotplt
= htab
->igotplt
;
2193 relplt
= htab
->irelplt
;
2196 /* Don't update value of STT_GNU_IFUNC symbol to PLT. We need
2197 the original value for R_386_IRELATIVE. */
2198 h
->plt
.offset
= plt
->size
;
2200 /* Make room for this entry in the .plt/.iplt section. */
2201 plt
->size
+= PLT_ENTRY_SIZE
;
2203 /* We also need to make an entry in the .got.plt/.got.iplt
2204 section, which will be placed in the .got section by the
2208 /* We also need to make an entry in the .rela.plt/.rela.iplt
2210 relplt
->size
+= sizeof (Elf32_External_Rel
);
2211 relplt
->reloc_count
++;
2213 /* We need dynamic relocation for STT_GNU_IFUNC symbol only
2214 when there is a non-GOT reference in a shared object. */
2217 eh
->dyn_relocs
= NULL
;
2219 /* Finally, allocate space. */
2220 for (p
= eh
->dyn_relocs
; p
!= NULL
; p
= p
->next
)
2221 htab
->irelifunc
->size
+= p
->count
* sizeof (Elf32_External_Rel
);
2223 /* For STT_GNU_IFUNC symbol, .got.plt has the real function
2224 addres and .got has the PLT entry adddress. We will load
2225 the GOT entry with the PLT entry in finish_dynamic_symbol if
2226 it is used. For branch, it uses .got.plt. For symbol value,
2227 1. Use .got.plt in a shared object if it is forced local or
2229 2. Use .got.plt in a non-shared object if pointer equality
2231 3. Use .got.plt in PIE.
2232 4. Use .got.plt if .got isn't used.
2233 5. Otherwise use .got so that it can be shared among different
2234 objects at run-time.
2235 We only need to relocate .got entry in shared object. */
2237 && (h
->dynindx
== -1
2238 || h
->forced_local
))
2240 && !h
->pointer_equality_needed
)
2241 || (info
->executable
&& info
->shared
)
2242 || htab
->sgot
== NULL
)
2245 h
->got
.offset
= (bfd_vma
) -1;
2249 h
->got
.offset
= htab
->sgot
->size
;
2250 htab
->sgot
->size
+= 4;
2252 htab
->srelgot
->size
+= sizeof (Elf32_External_Rel
);
2257 else if (htab
->elf
.dynamic_sections_created
2258 && h
->plt
.refcount
> 0)
2260 /* Make sure this symbol is output as a dynamic symbol.
2261 Undefined weak syms won't yet be marked as dynamic. */
2262 if (h
->dynindx
== -1
2263 && !h
->forced_local
)
2265 if (! bfd_elf_link_record_dynamic_symbol (info
, h
))
2270 || WILL_CALL_FINISH_DYNAMIC_SYMBOL (1, 0, h
))
2272 asection
*s
= htab
->splt
;
2274 /* If this is the first .plt entry, make room for the special
2277 s
->size
+= PLT_ENTRY_SIZE
;
2279 h
->plt
.offset
= s
->size
;
2281 /* If this symbol is not defined in a regular file, and we are
2282 not generating a shared library, then set the symbol to this
2283 location in the .plt. This is required to make function
2284 pointers compare as equal between the normal executable and
2285 the shared library. */
2289 h
->root
.u
.def
.section
= s
;
2290 h
->root
.u
.def
.value
= h
->plt
.offset
;
2293 /* Make room for this entry. */
2294 s
->size
+= PLT_ENTRY_SIZE
;
2296 /* We also need to make an entry in the .got.plt section, which
2297 will be placed in the .got section by the linker script. */
2298 htab
->sgotplt
->size
+= 4;
2300 /* We also need to make an entry in the .rel.plt section. */
2301 htab
->srelplt
->size
+= sizeof (Elf32_External_Rel
);
2302 htab
->next_tls_desc_index
++;
2304 if (htab
->is_vxworks
&& !info
->shared
)
2306 /* VxWorks has a second set of relocations for each PLT entry
2307 in executables. They go in a separate relocation section,
2308 which is processed by the kernel loader. */
2310 /* There are two relocations for the initial PLT entry: an
2311 R_386_32 relocation for _GLOBAL_OFFSET_TABLE_ + 4 and an
2312 R_386_32 relocation for _GLOBAL_OFFSET_TABLE_ + 8. */
2314 if (h
->plt
.offset
== PLT_ENTRY_SIZE
)
2315 htab
->srelplt2
->size
+= (sizeof (Elf32_External_Rel
) * 2);
2317 /* There are two extra relocations for each subsequent PLT entry:
2318 an R_386_32 relocation for the GOT entry, and an R_386_32
2319 relocation for the PLT entry. */
2321 htab
->srelplt2
->size
+= (sizeof (Elf32_External_Rel
) * 2);
2326 h
->plt
.offset
= (bfd_vma
) -1;
2332 h
->plt
.offset
= (bfd_vma
) -1;
2336 eh
->tlsdesc_got
= (bfd_vma
) -1;
2338 /* If R_386_TLS_{IE_32,IE,GOTIE} symbol is now local to the binary,
2339 make it a R_386_TLS_LE_32 requiring no TLS entry. */
2340 if (h
->got
.refcount
> 0
2343 && (elf_i386_hash_entry(h
)->tls_type
& GOT_TLS_IE
))
2344 h
->got
.offset
= (bfd_vma
) -1;
2345 else if (h
->got
.refcount
> 0)
2349 int tls_type
= elf_i386_hash_entry(h
)->tls_type
;
2351 /* Make sure this symbol is output as a dynamic symbol.
2352 Undefined weak syms won't yet be marked as dynamic. */
2353 if (h
->dynindx
== -1
2354 && !h
->forced_local
)
2356 if (! bfd_elf_link_record_dynamic_symbol (info
, h
))
2361 if (GOT_TLS_GDESC_P (tls_type
))
2363 eh
->tlsdesc_got
= htab
->sgotplt
->size
2364 - elf_i386_compute_jump_table_size (htab
);
2365 htab
->sgotplt
->size
+= 8;
2366 h
->got
.offset
= (bfd_vma
) -2;
2368 if (! GOT_TLS_GDESC_P (tls_type
)
2369 || GOT_TLS_GD_P (tls_type
))
2371 h
->got
.offset
= s
->size
;
2373 /* R_386_TLS_GD needs 2 consecutive GOT slots. */
2374 if (GOT_TLS_GD_P (tls_type
) || tls_type
== GOT_TLS_IE_BOTH
)
2377 dyn
= htab
->elf
.dynamic_sections_created
;
2378 /* R_386_TLS_IE_32 needs one dynamic relocation,
2379 R_386_TLS_IE resp. R_386_TLS_GOTIE needs one dynamic relocation,
2380 (but if both R_386_TLS_IE_32 and R_386_TLS_IE is present, we
2381 need two), R_386_TLS_GD needs one if local symbol and two if
2383 if (tls_type
== GOT_TLS_IE_BOTH
)
2384 htab
->srelgot
->size
+= 2 * sizeof (Elf32_External_Rel
);
2385 else if ((GOT_TLS_GD_P (tls_type
) && h
->dynindx
== -1)
2386 || (tls_type
& GOT_TLS_IE
))
2387 htab
->srelgot
->size
+= sizeof (Elf32_External_Rel
);
2388 else if (GOT_TLS_GD_P (tls_type
))
2389 htab
->srelgot
->size
+= 2 * sizeof (Elf32_External_Rel
);
2390 else if (! GOT_TLS_GDESC_P (tls_type
)
2391 && (ELF_ST_VISIBILITY (h
->other
) == STV_DEFAULT
2392 || h
->root
.type
!= bfd_link_hash_undefweak
)
2394 || WILL_CALL_FINISH_DYNAMIC_SYMBOL (dyn
, 0, h
)))
2395 htab
->srelgot
->size
+= sizeof (Elf32_External_Rel
);
2396 if (GOT_TLS_GDESC_P (tls_type
))
2397 htab
->srelplt
->size
+= sizeof (Elf32_External_Rel
);
2400 h
->got
.offset
= (bfd_vma
) -1;
2402 if (eh
->dyn_relocs
== NULL
)
2405 /* In the shared -Bsymbolic case, discard space allocated for
2406 dynamic pc-relative relocs against symbols which turn out to be
2407 defined in regular objects. For the normal shared case, discard
2408 space for pc-relative relocs that have become local due to symbol
2409 visibility changes. */
2413 /* The only reloc that uses pc_count is R_386_PC32, which will
2414 appear on a call or on something like ".long foo - .". We
2415 want calls to protected symbols to resolve directly to the
2416 function rather than going via the plt. If people want
2417 function pointer comparisons to work as expected then they
2418 should avoid writing assembly like ".long foo - .". */
2419 if (SYMBOL_CALLS_LOCAL (info
, h
))
2421 struct elf_i386_dyn_relocs
**pp
;
2423 for (pp
= &eh
->dyn_relocs
; (p
= *pp
) != NULL
; )
2425 p
->count
-= p
->pc_count
;
2434 if (htab
->is_vxworks
)
2436 struct elf_i386_dyn_relocs
**pp
;
2437 for (pp
= &eh
->dyn_relocs
; (p
= *pp
) != NULL
; )
2439 if (strcmp (p
->sec
->output_section
->name
, ".tls_vars") == 0)
2446 /* Also discard relocs on undefined weak syms with non-default
2448 if (eh
->dyn_relocs
!= NULL
2449 && h
->root
.type
== bfd_link_hash_undefweak
)
2451 if (ELF_ST_VISIBILITY (h
->other
) != STV_DEFAULT
)
2452 eh
->dyn_relocs
= NULL
;
2454 /* Make sure undefined weak symbols are output as a dynamic
2456 else if (h
->dynindx
== -1
2457 && !h
->forced_local
)
2459 if (! bfd_elf_link_record_dynamic_symbol (info
, h
))
2464 else if (ELIMINATE_COPY_RELOCS
)
2466 /* For the non-shared case, discard space for relocs against
2467 symbols which turn out to need copy relocs or are not
2473 || (htab
->elf
.dynamic_sections_created
2474 && (h
->root
.type
== bfd_link_hash_undefweak
2475 || h
->root
.type
== bfd_link_hash_undefined
))))
2477 /* Make sure this symbol is output as a dynamic symbol.
2478 Undefined weak syms won't yet be marked as dynamic. */
2479 if (h
->dynindx
== -1
2480 && !h
->forced_local
)
2482 if (! bfd_elf_link_record_dynamic_symbol (info
, h
))
2486 /* If that succeeded, we know we'll be keeping all the
2488 if (h
->dynindx
!= -1)
2492 eh
->dyn_relocs
= NULL
;
2497 /* Finally, allocate space. */
2498 for (p
= eh
->dyn_relocs
; p
!= NULL
; p
= p
->next
)
2502 sreloc
= elf_section_data (p
->sec
)->sreloc
;
2504 BFD_ASSERT (sreloc
!= NULL
);
2505 sreloc
->size
+= p
->count
* sizeof (Elf32_External_Rel
);
2511 /* Allocate space in .plt, .got and associated reloc sections for
2512 local dynamic relocs. */
2515 elf_i386_allocate_local_dynrelocs (void **slot
, void *inf
)
2517 struct elf_link_hash_entry
*h
2518 = (struct elf_link_hash_entry
*) *slot
;
2520 if (h
->type
!= STT_GNU_IFUNC
2524 || h
->root
.type
!= bfd_link_hash_defined
)
2527 return elf_i386_allocate_dynrelocs (h
, inf
);
2530 /* Find any dynamic relocs that apply to read-only sections. */
2533 elf_i386_readonly_dynrelocs (struct elf_link_hash_entry
*h
, void *inf
)
2535 struct elf_i386_link_hash_entry
*eh
;
2536 struct elf_i386_dyn_relocs
*p
;
2538 if (h
->root
.type
== bfd_link_hash_warning
)
2539 h
= (struct elf_link_hash_entry
*) h
->root
.u
.i
.link
;
2541 eh
= (struct elf_i386_link_hash_entry
*) h
;
2542 for (p
= eh
->dyn_relocs
; p
!= NULL
; p
= p
->next
)
2544 asection
*s
= p
->sec
->output_section
;
2546 if (s
!= NULL
&& (s
->flags
& SEC_READONLY
) != 0)
2548 struct bfd_link_info
*info
= (struct bfd_link_info
*) inf
;
2550 info
->flags
|= DF_TEXTREL
;
2552 /* Not an error, just cut short the traversal. */
2559 /* Set the sizes of the dynamic sections. */
2562 elf_i386_size_dynamic_sections (bfd
*output_bfd ATTRIBUTE_UNUSED
,
2563 struct bfd_link_info
*info
)
2565 struct elf_i386_link_hash_table
*htab
;
2571 htab
= elf_i386_hash_table (info
);
2572 dynobj
= htab
->elf
.dynobj
;
2576 if (htab
->elf
.dynamic_sections_created
)
2578 /* Set the contents of the .interp section to the interpreter. */
2579 if (info
->executable
)
2581 s
= bfd_get_section_by_name (dynobj
, ".interp");
2584 s
->size
= sizeof ELF_DYNAMIC_INTERPRETER
;
2585 s
->contents
= (unsigned char *) ELF_DYNAMIC_INTERPRETER
;
2589 /* Set up .got offsets for local syms, and space for local dynamic
2591 for (ibfd
= info
->input_bfds
; ibfd
!= NULL
; ibfd
= ibfd
->link_next
)
2593 bfd_signed_vma
*local_got
;
2594 bfd_signed_vma
*end_local_got
;
2595 char *local_tls_type
;
2596 bfd_vma
*local_tlsdesc_gotent
;
2597 bfd_size_type locsymcount
;
2598 Elf_Internal_Shdr
*symtab_hdr
;
2601 if (! is_i386_elf (ibfd
))
2604 for (s
= ibfd
->sections
; s
!= NULL
; s
= s
->next
)
2606 struct elf_i386_dyn_relocs
*p
;
2608 for (p
= ((struct elf_i386_dyn_relocs
*)
2609 elf_section_data (s
)->local_dynrel
);
2613 if (!bfd_is_abs_section (p
->sec
)
2614 && bfd_is_abs_section (p
->sec
->output_section
))
2616 /* Input section has been discarded, either because
2617 it is a copy of a linkonce section or due to
2618 linker script /DISCARD/, so we'll be discarding
2621 else if (htab
->is_vxworks
2622 && strcmp (p
->sec
->output_section
->name
,
2625 /* Relocations in vxworks .tls_vars sections are
2626 handled specially by the loader. */
2628 else if (p
->count
!= 0)
2630 srel
= elf_section_data (p
->sec
)->sreloc
;
2631 srel
->size
+= p
->count
* sizeof (Elf32_External_Rel
);
2632 if ((p
->sec
->output_section
->flags
& SEC_READONLY
) != 0)
2633 info
->flags
|= DF_TEXTREL
;
2638 local_got
= elf_local_got_refcounts (ibfd
);
2642 symtab_hdr
= &elf_symtab_hdr (ibfd
);
2643 locsymcount
= symtab_hdr
->sh_info
;
2644 end_local_got
= local_got
+ locsymcount
;
2645 local_tls_type
= elf_i386_local_got_tls_type (ibfd
);
2646 local_tlsdesc_gotent
= elf_i386_local_tlsdesc_gotent (ibfd
);
2648 srel
= htab
->srelgot
;
2649 for (; local_got
< end_local_got
;
2650 ++local_got
, ++local_tls_type
, ++local_tlsdesc_gotent
)
2652 *local_tlsdesc_gotent
= (bfd_vma
) -1;
2655 if (GOT_TLS_GDESC_P (*local_tls_type
))
2657 *local_tlsdesc_gotent
= htab
->sgotplt
->size
2658 - elf_i386_compute_jump_table_size (htab
);
2659 htab
->sgotplt
->size
+= 8;
2660 *local_got
= (bfd_vma
) -2;
2662 if (! GOT_TLS_GDESC_P (*local_tls_type
)
2663 || GOT_TLS_GD_P (*local_tls_type
))
2665 *local_got
= s
->size
;
2667 if (GOT_TLS_GD_P (*local_tls_type
)
2668 || *local_tls_type
== GOT_TLS_IE_BOTH
)
2672 || GOT_TLS_GD_ANY_P (*local_tls_type
)
2673 || (*local_tls_type
& GOT_TLS_IE
))
2675 if (*local_tls_type
== GOT_TLS_IE_BOTH
)
2676 srel
->size
+= 2 * sizeof (Elf32_External_Rel
);
2677 else if (GOT_TLS_GD_P (*local_tls_type
)
2678 || ! GOT_TLS_GDESC_P (*local_tls_type
))
2679 srel
->size
+= sizeof (Elf32_External_Rel
);
2680 if (GOT_TLS_GDESC_P (*local_tls_type
))
2681 htab
->srelplt
->size
+= sizeof (Elf32_External_Rel
);
2685 *local_got
= (bfd_vma
) -1;
2689 if (htab
->tls_ldm_got
.refcount
> 0)
2691 /* Allocate 2 got entries and 1 dynamic reloc for R_386_TLS_LDM
2693 htab
->tls_ldm_got
.offset
= htab
->sgot
->size
;
2694 htab
->sgot
->size
+= 8;
2695 htab
->srelgot
->size
+= sizeof (Elf32_External_Rel
);
2698 htab
->tls_ldm_got
.offset
= -1;
2700 /* Allocate global sym .plt and .got entries, and space for global
2701 sym dynamic relocs. */
2702 elf_link_hash_traverse (&htab
->elf
, elf_i386_allocate_dynrelocs
, info
);
2704 /* Allocate .plt and .got entries, and space for local symbols. */
2705 htab_traverse (htab
->loc_hash_table
,
2706 elf_i386_allocate_local_dynrelocs
,
2709 /* For every jump slot reserved in the sgotplt, reloc_count is
2710 incremented. However, when we reserve space for TLS descriptors,
2711 it's not incremented, so in order to compute the space reserved
2712 for them, it suffices to multiply the reloc count by the jump
2715 htab
->sgotplt_jump_table_size
= htab
->next_tls_desc_index
* 4;
2717 /* We now have determined the sizes of the various dynamic sections.
2718 Allocate memory for them. */
2720 for (s
= dynobj
->sections
; s
!= NULL
; s
= s
->next
)
2722 bfd_boolean strip_section
= TRUE
;
2724 if ((s
->flags
& SEC_LINKER_CREATED
) == 0)
2729 || s
== htab
->sgotplt
2731 || s
== htab
->igotplt
2732 || s
== htab
->sdynbss
)
2734 /* Strip this section if we don't need it; see the
2736 /* We'd like to strip these sections if they aren't needed, but if
2737 we've exported dynamic symbols from them we must leave them.
2738 It's too late to tell BFD to get rid of the symbols. */
2740 if (htab
->elf
.hplt
!= NULL
)
2741 strip_section
= FALSE
;
2743 else if (CONST_STRNEQ (bfd_get_section_name (dynobj
, s
), ".rel"))
2745 if (s
->size
!= 0 && s
!= htab
->srelplt
&& s
!= htab
->srelplt2
)
2748 /* We use the reloc_count field as a counter if we need
2749 to copy relocs into the output file. */
2754 /* It's not one of our sections, so don't allocate space. */
2760 /* If we don't need this section, strip it from the
2761 output file. This is mostly to handle .rel.bss and
2762 .rel.plt. We must create both sections in
2763 create_dynamic_sections, because they must be created
2764 before the linker maps input sections to output
2765 sections. The linker does that before
2766 adjust_dynamic_symbol is called, and it is that
2767 function which decides whether anything needs to go
2768 into these sections. */
2770 s
->flags
|= SEC_EXCLUDE
;
2774 if ((s
->flags
& SEC_HAS_CONTENTS
) == 0)
2777 /* Allocate memory for the section contents. We use bfd_zalloc
2778 here in case unused entries are not reclaimed before the
2779 section's contents are written out. This should not happen,
2780 but this way if it does, we get a R_386_NONE reloc instead
2782 s
->contents
= bfd_zalloc (dynobj
, s
->size
);
2783 if (s
->contents
== NULL
)
2787 if (htab
->elf
.dynamic_sections_created
)
2789 /* Add some entries to the .dynamic section. We fill in the
2790 values later, in elf_i386_finish_dynamic_sections, but we
2791 must add the entries now so that we get the correct size for
2792 the .dynamic section. The DT_DEBUG entry is filled in by the
2793 dynamic linker and used by the debugger. */
2794 #define add_dynamic_entry(TAG, VAL) \
2795 _bfd_elf_add_dynamic_entry (info, TAG, VAL)
2797 if (info
->executable
)
2799 if (!add_dynamic_entry (DT_DEBUG
, 0))
2803 if (htab
->splt
->size
!= 0)
2805 if (!add_dynamic_entry (DT_PLTGOT
, 0)
2806 || !add_dynamic_entry (DT_PLTRELSZ
, 0)
2807 || !add_dynamic_entry (DT_PLTREL
, DT_REL
)
2808 || !add_dynamic_entry (DT_JMPREL
, 0))
2814 if (!add_dynamic_entry (DT_REL
, 0)
2815 || !add_dynamic_entry (DT_RELSZ
, 0)
2816 || !add_dynamic_entry (DT_RELENT
, sizeof (Elf32_External_Rel
)))
2819 /* If any dynamic relocs apply to a read-only section,
2820 then we need a DT_TEXTREL entry. */
2821 if ((info
->flags
& DF_TEXTREL
) == 0)
2822 elf_link_hash_traverse (&htab
->elf
,
2823 elf_i386_readonly_dynrelocs
, info
);
2825 if ((info
->flags
& DF_TEXTREL
) != 0)
2827 if (!add_dynamic_entry (DT_TEXTREL
, 0))
2831 if (htab
->is_vxworks
2832 && !elf_vxworks_add_dynamic_entries (output_bfd
, info
))
2835 #undef add_dynamic_entry
2841 elf_i386_always_size_sections (bfd
*output_bfd
,
2842 struct bfd_link_info
*info
)
2844 asection
*tls_sec
= elf_hash_table (info
)->tls_sec
;
2848 struct elf_link_hash_entry
*tlsbase
;
2850 tlsbase
= elf_link_hash_lookup (elf_hash_table (info
),
2851 "_TLS_MODULE_BASE_",
2852 FALSE
, FALSE
, FALSE
);
2854 if (tlsbase
&& tlsbase
->type
== STT_TLS
)
2856 struct bfd_link_hash_entry
*bh
= NULL
;
2857 const struct elf_backend_data
*bed
2858 = get_elf_backend_data (output_bfd
);
2860 if (!(_bfd_generic_link_add_one_symbol
2861 (info
, output_bfd
, "_TLS_MODULE_BASE_", BSF_LOCAL
,
2862 tls_sec
, 0, NULL
, FALSE
,
2863 bed
->collect
, &bh
)))
2866 elf_i386_hash_table (info
)->tls_module_base
= bh
;
2868 tlsbase
= (struct elf_link_hash_entry
*)bh
;
2869 tlsbase
->def_regular
= 1;
2870 tlsbase
->other
= STV_HIDDEN
;
2871 (*bed
->elf_backend_hide_symbol
) (info
, tlsbase
, TRUE
);
2878 /* Set the correct type for an x86 ELF section. We do this by the
2879 section name, which is a hack, but ought to work. */
2882 elf_i386_fake_sections (bfd
*abfd ATTRIBUTE_UNUSED
,
2883 Elf_Internal_Shdr
*hdr
,
2886 register const char *name
;
2888 name
= bfd_get_section_name (abfd
, sec
);
2890 /* This is an ugly, but unfortunately necessary hack that is
2891 needed when producing EFI binaries on x86. It tells
2892 elf.c:elf_fake_sections() not to consider ".reloc" as a section
2893 containing ELF relocation info. We need this hack in order to
2894 be able to generate ELF binaries that can be translated into
2895 EFI applications (which are essentially COFF objects). Those
2896 files contain a COFF ".reloc" section inside an ELFNN object,
2897 which would normally cause BFD to segfault because it would
2898 attempt to interpret this section as containing relocation
2899 entries for section "oc". With this hack enabled, ".reloc"
2900 will be treated as a normal data section, which will avoid the
2901 segfault. However, you won't be able to create an ELFNN binary
2902 with a section named "oc" that needs relocations, but that's
2903 the kind of ugly side-effects you get when detecting section
2904 types based on their names... In practice, this limitation is
2905 unlikely to bite. */
2906 if (strcmp (name
, ".reloc") == 0)
2907 hdr
->sh_type
= SHT_PROGBITS
;
2912 /* _TLS_MODULE_BASE_ needs to be treated especially when linking
2913 executables. Rather than setting it to the beginning of the TLS
2914 section, we have to set it to the end. This function may be called
2915 multiple times, it is idempotent. */
2918 elf_i386_set_tls_module_base (struct bfd_link_info
*info
)
2920 struct bfd_link_hash_entry
*base
;
2922 if (!info
->executable
)
2925 base
= elf_i386_hash_table (info
)->tls_module_base
;
2930 base
->u
.def
.value
= elf_hash_table (info
)->tls_size
;
2933 /* Return the base VMA address which should be subtracted from real addresses
2934 when resolving @dtpoff relocation.
2935 This is PT_TLS segment p_vaddr. */
2938 elf_i386_dtpoff_base (struct bfd_link_info
*info
)
2940 /* If tls_sec is NULL, we should have signalled an error already. */
2941 if (elf_hash_table (info
)->tls_sec
== NULL
)
2943 return elf_hash_table (info
)->tls_sec
->vma
;
2946 /* Return the relocation value for @tpoff relocation
2947 if STT_TLS virtual address is ADDRESS. */
2950 elf_i386_tpoff (struct bfd_link_info
*info
, bfd_vma address
)
2952 struct elf_link_hash_table
*htab
= elf_hash_table (info
);
2954 /* If tls_sec is NULL, we should have signalled an error already. */
2955 if (htab
->tls_sec
== NULL
)
2957 return htab
->tls_size
+ htab
->tls_sec
->vma
- address
;
2960 /* Relocate an i386 ELF section. */
2963 elf_i386_relocate_section (bfd
*output_bfd
,
2964 struct bfd_link_info
*info
,
2966 asection
*input_section
,
2968 Elf_Internal_Rela
*relocs
,
2969 Elf_Internal_Sym
*local_syms
,
2970 asection
**local_sections
)
2972 struct elf_i386_link_hash_table
*htab
;
2973 Elf_Internal_Shdr
*symtab_hdr
;
2974 struct elf_link_hash_entry
**sym_hashes
;
2975 bfd_vma
*local_got_offsets
;
2976 bfd_vma
*local_tlsdesc_gotents
;
2977 Elf_Internal_Rela
*rel
;
2978 Elf_Internal_Rela
*relend
;
2979 bfd_boolean is_vxworks_tls
;
2981 BFD_ASSERT (is_i386_elf (input_bfd
));
2983 htab
= elf_i386_hash_table (info
);
2984 symtab_hdr
= &elf_symtab_hdr (input_bfd
);
2985 sym_hashes
= elf_sym_hashes (input_bfd
);
2986 local_got_offsets
= elf_local_got_offsets (input_bfd
);
2987 local_tlsdesc_gotents
= elf_i386_local_tlsdesc_gotent (input_bfd
);
2988 /* We have to handle relocations in vxworks .tls_vars sections
2989 specially, because the dynamic loader is 'weird'. */
2990 is_vxworks_tls
= (htab
->is_vxworks
&& info
->shared
2991 && !strcmp (input_section
->output_section
->name
,
2994 elf_i386_set_tls_module_base (info
);
2997 relend
= relocs
+ input_section
->reloc_count
;
2998 for (; rel
< relend
; rel
++)
3000 unsigned int r_type
;
3001 reloc_howto_type
*howto
;
3002 unsigned long r_symndx
;
3003 struct elf_link_hash_entry
*h
;
3004 Elf_Internal_Sym
*sym
;
3006 bfd_vma off
, offplt
;
3008 bfd_boolean unresolved_reloc
;
3009 bfd_reloc_status_type r
;
3013 r_type
= ELF32_R_TYPE (rel
->r_info
);
3014 if (r_type
== R_386_GNU_VTINHERIT
3015 || r_type
== R_386_GNU_VTENTRY
)
3018 if ((indx
= r_type
) >= R_386_standard
3019 && ((indx
= r_type
- R_386_ext_offset
) - R_386_standard
3020 >= R_386_ext
- R_386_standard
)
3021 && ((indx
= r_type
- R_386_tls_offset
) - R_386_ext
3022 >= R_386_irelative
- R_386_ext
))
3024 (*_bfd_error_handler
)
3025 (_("%B: unrecognized relocation (0x%x) in section `%A'"),
3026 input_bfd
, input_section
, r_type
);
3027 bfd_set_error (bfd_error_bad_value
);
3030 howto
= elf_howto_table
+ indx
;
3032 r_symndx
= ELF32_R_SYM (rel
->r_info
);
3036 unresolved_reloc
= FALSE
;
3037 if (r_symndx
< symtab_hdr
->sh_info
)
3039 sym
= local_syms
+ r_symndx
;
3040 sec
= local_sections
[r_symndx
];
3041 relocation
= (sec
->output_section
->vma
3042 + sec
->output_offset
3045 if (ELF_ST_TYPE (sym
->st_info
) == STT_SECTION
3046 && ((sec
->flags
& SEC_MERGE
) != 0
3047 || (info
->relocatable
3048 && sec
->output_offset
!= 0)))
3051 bfd_byte
*where
= contents
+ rel
->r_offset
;
3053 switch (howto
->size
)
3056 addend
= bfd_get_8 (input_bfd
, where
);
3057 if (howto
->pc_relative
)
3059 addend
= (addend
^ 0x80) - 0x80;
3064 addend
= bfd_get_16 (input_bfd
, where
);
3065 if (howto
->pc_relative
)
3067 addend
= (addend
^ 0x8000) - 0x8000;
3072 addend
= bfd_get_32 (input_bfd
, where
);
3073 if (howto
->pc_relative
)
3075 addend
= (addend
^ 0x80000000) - 0x80000000;
3083 if (info
->relocatable
)
3084 addend
+= sec
->output_offset
;
3087 asection
*msec
= sec
;
3088 addend
= _bfd_elf_rel_local_sym (output_bfd
, sym
, &msec
,
3090 addend
-= relocation
;
3091 addend
+= msec
->output_section
->vma
+ msec
->output_offset
;
3094 switch (howto
->size
)
3097 /* FIXME: overflow checks. */
3098 if (howto
->pc_relative
)
3100 bfd_put_8 (input_bfd
, addend
, where
);
3103 if (howto
->pc_relative
)
3105 bfd_put_16 (input_bfd
, addend
, where
);
3108 if (howto
->pc_relative
)
3110 bfd_put_32 (input_bfd
, addend
, where
);
3114 else if (ELF32_ST_TYPE (sym
->st_info
) == STT_GNU_IFUNC
)
3116 /* Relocate against local STT_GNU_IFUNC symbol. */
3117 h
= elf_i386_get_local_sym_hash (htab
, input_bfd
,
3122 /* Set STT_GNU_IFUNC symbol value. */
3123 h
->root
.u
.def
.value
= sym
->st_value
;
3124 h
->root
.u
.def
.section
= sec
;
3131 RELOC_FOR_GLOBAL_SYMBOL (info
, input_bfd
, input_section
, rel
,
3132 r_symndx
, symtab_hdr
, sym_hashes
,
3134 unresolved_reloc
, warned
);
3137 if (sec
!= NULL
&& elf_discarded_section (sec
))
3139 /* For relocs against symbols from removed linkonce sections,
3140 or sections discarded by a linker script, we just want the
3141 section contents zeroed. Avoid any special processing. */
3142 _bfd_clear_contents (howto
, input_bfd
, contents
+ rel
->r_offset
);
3148 if (info
->relocatable
)
3151 /* Since STT_GNU_IFUNC symbol must go through PLT, we handle
3152 it here if it is defined in a non-shared object. */
3154 && h
->type
== STT_GNU_IFUNC
3157 asection
*plt
, *gotplt
, *base_got
;
3160 if ((input_section
->flags
& SEC_ALLOC
) == 0
3161 || h
->plt
.offset
== (bfd_vma
) -1)
3164 /* STT_GNU_IFUNC symbol must go through PLT. */
3165 if (htab
->splt
!= NULL
)
3168 gotplt
= htab
->sgotplt
;
3173 gotplt
= htab
->igotplt
;
3176 relocation
= (plt
->output_section
->vma
3177 + plt
->output_offset
+ h
->plt
.offset
);
3182 (*_bfd_error_handler
)
3183 (_("%B: relocation %s against STT_GNU_IFUNC "
3184 "symbol `%s' isn't handled by %s"), input_bfd
,
3185 elf_howto_table
[r_type
].name
,
3186 (h
->root
.root
.string
3187 ? h
->root
.root
.string
: "a local symbol"),
3189 bfd_set_error (bfd_error_bad_value
);
3193 /* Generate dynamic relcoation only when there is a
3194 non-GOF reference in a shared object. */
3195 if (info
->shared
&& h
->non_got_ref
)
3197 Elf_Internal_Rela outrel
;
3202 /* Need a dynamic relocation to get the real function
3204 offset
= _bfd_elf_section_offset (output_bfd
,
3208 if (offset
== (bfd_vma
) -1
3209 || offset
== (bfd_vma
) -2)
3212 outrel
.r_offset
= (input_section
->output_section
->vma
3213 + input_section
->output_offset
3216 if (h
->dynindx
== -1
3218 || info
->executable
)
3220 /* This symbol is resolved locally. */
3221 outrel
.r_info
= ELF32_R_INFO (0, R_386_IRELATIVE
);
3222 bfd_put_32 (output_bfd
,
3223 (h
->root
.u
.def
.value
3224 + h
->root
.u
.def
.section
->output_section
->vma
3225 + h
->root
.u
.def
.section
->output_offset
),
3229 outrel
.r_info
= ELF32_R_INFO (h
->dynindx
, r_type
);
3231 sreloc
= htab
->irelifunc
;
3232 loc
= sreloc
->contents
;
3233 loc
+= (sreloc
->reloc_count
++
3234 * sizeof (Elf32_External_Rel
));
3235 bfd_elf32_swap_reloc_out (output_bfd
, &outrel
, loc
);
3237 /* If this reloc is against an external symbol, we
3238 do not want to fiddle with the addend. Otherwise,
3239 we need to include the symbol value so that it
3240 becomes an addend for the dynamic reloc. For an
3241 internal symbol, we have updated addend. */
3250 base_got
= htab
->sgot
;
3251 off
= h
->got
.offset
;
3253 if (base_got
== NULL
)
3256 if (off
== (bfd_vma
) -1)
3258 /* We can't use h->got.offset here to save state, or
3259 even just remember the offset, as finish_dynamic_symbol
3260 would use that as offset into .got. */
3262 if (htab
->splt
!= NULL
)
3264 plt_index
= h
->plt
.offset
/ PLT_ENTRY_SIZE
- 1;
3265 off
= (plt_index
+ 3) * 4;
3266 base_got
= htab
->sgotplt
;
3270 plt_index
= h
->plt
.offset
/ PLT_ENTRY_SIZE
;
3271 off
= plt_index
* 4;
3272 base_got
= htab
->igotplt
;
3275 if (h
->dynindx
== -1
3279 /* This references the local defitionion. We must
3280 initialize this entry in the global offset table.
3281 Since the offset must always be a multiple of 8,
3282 we use the least significant bit to record
3283 whether we have initialized it already.
3285 When doing a dynamic link, we create a .rela.got
3286 relocation entry to initialize the value. This
3287 is done in the finish_dynamic_symbol routine. */
3292 bfd_put_32 (output_bfd
, relocation
,
3293 base_got
->contents
+ off
);
3300 /* Adjust for static executables. */
3301 if (htab
->splt
== NULL
)
3302 relocation
+= gotplt
->output_offset
;
3306 relocation
= (base_got
->output_section
->vma
3307 + base_got
->output_offset
+ off
3308 - gotplt
->output_section
->vma
3309 - gotplt
->output_offset
);
3310 /* Adjust for static executables. */
3311 if (htab
->splt
== NULL
)
3312 relocation
+= gotplt
->output_offset
;
3318 relocation
-= (gotplt
->output_section
->vma
3319 + gotplt
->output_offset
);
3327 /* Relocation is to the entry for this symbol in the global
3329 if (htab
->sgot
== NULL
)
3336 off
= h
->got
.offset
;
3337 dyn
= htab
->elf
.dynamic_sections_created
;
3338 if (! WILL_CALL_FINISH_DYNAMIC_SYMBOL (dyn
, info
->shared
, h
)
3340 && SYMBOL_REFERENCES_LOCAL (info
, h
))
3341 || (ELF_ST_VISIBILITY (h
->other
)
3342 && h
->root
.type
== bfd_link_hash_undefweak
))
3344 /* This is actually a static link, or it is a
3345 -Bsymbolic link and the symbol is defined
3346 locally, or the symbol was forced to be local
3347 because of a version file. We must initialize
3348 this entry in the global offset table. Since the
3349 offset must always be a multiple of 4, we use the
3350 least significant bit to record whether we have
3351 initialized it already.
3353 When doing a dynamic link, we create a .rel.got
3354 relocation entry to initialize the value. This
3355 is done in the finish_dynamic_symbol routine. */
3360 bfd_put_32 (output_bfd
, relocation
,
3361 htab
->sgot
->contents
+ off
);
3366 unresolved_reloc
= FALSE
;
3370 if (local_got_offsets
== NULL
)
3373 off
= local_got_offsets
[r_symndx
];
3375 /* The offset must always be a multiple of 4. We use
3376 the least significant bit to record whether we have
3377 already generated the necessary reloc. */
3382 bfd_put_32 (output_bfd
, relocation
,
3383 htab
->sgot
->contents
+ off
);
3388 Elf_Internal_Rela outrel
;
3395 outrel
.r_offset
= (htab
->sgot
->output_section
->vma
3396 + htab
->sgot
->output_offset
3398 outrel
.r_info
= ELF32_R_INFO (0, R_386_RELATIVE
);
3400 loc
+= s
->reloc_count
++ * sizeof (Elf32_External_Rel
);
3401 bfd_elf32_swap_reloc_out (output_bfd
, &outrel
, loc
);
3404 local_got_offsets
[r_symndx
] |= 1;
3408 if (off
>= (bfd_vma
) -2)
3411 relocation
= htab
->sgot
->output_section
->vma
3412 + htab
->sgot
->output_offset
+ off
3413 - htab
->sgotplt
->output_section
->vma
3414 - htab
->sgotplt
->output_offset
;
3418 /* Relocation is relative to the start of the global offset
3421 /* Check to make sure it isn't a protected function symbol
3422 for shared library since it may not be local when used
3423 as function address. We also need to make sure that a
3424 symbol is defined locally. */
3425 if (info
->shared
&& h
)
3427 if (!h
->def_regular
)
3431 switch (ELF_ST_VISIBILITY (h
->other
))
3434 v
= _("hidden symbol");
3437 v
= _("internal symbol");
3440 v
= _("protected symbol");
3447 (*_bfd_error_handler
)
3448 (_("%B: relocation R_386_GOTOFF against undefined %s `%s' can not be used when making a shared object"),
3449 input_bfd
, v
, h
->root
.root
.string
);
3450 bfd_set_error (bfd_error_bad_value
);
3453 else if (!info
->executable
3454 && h
->type
== STT_FUNC
3455 && ELF_ST_VISIBILITY (h
->other
) == STV_PROTECTED
)
3457 (*_bfd_error_handler
)
3458 (_("%B: relocation R_386_GOTOFF against protected function `%s' can not be used when making a shared object"),
3459 input_bfd
, h
->root
.root
.string
);
3460 bfd_set_error (bfd_error_bad_value
);
3465 /* Note that sgot is not involved in this
3466 calculation. We always want the start of .got.plt. If we
3467 defined _GLOBAL_OFFSET_TABLE_ in a different way, as is
3468 permitted by the ABI, we might have to change this
3470 relocation
-= htab
->sgotplt
->output_section
->vma
3471 + htab
->sgotplt
->output_offset
;
3475 /* Use global offset table as symbol value. */
3476 relocation
= htab
->sgotplt
->output_section
->vma
3477 + htab
->sgotplt
->output_offset
;
3478 unresolved_reloc
= FALSE
;
3482 /* Relocation is to the entry for this symbol in the
3483 procedure linkage table. */
3485 /* Resolve a PLT32 reloc against a local symbol directly,
3486 without using the procedure linkage table. */
3490 if (h
->plt
.offset
== (bfd_vma
) -1
3491 || htab
->splt
== NULL
)
3493 /* We didn't make a PLT entry for this symbol. This
3494 happens when statically linking PIC code, or when
3495 using -Bsymbolic. */
3499 relocation
= (htab
->splt
->output_section
->vma
3500 + htab
->splt
->output_offset
3502 unresolved_reloc
= FALSE
;
3507 if ((input_section
->flags
& SEC_ALLOC
) == 0
3513 || ELF_ST_VISIBILITY (h
->other
) == STV_DEFAULT
3514 || h
->root
.type
!= bfd_link_hash_undefweak
)
3515 && (r_type
!= R_386_PC32
3516 || !SYMBOL_CALLS_LOCAL (info
, h
)))
3517 || (ELIMINATE_COPY_RELOCS
3524 || h
->root
.type
== bfd_link_hash_undefweak
3525 || h
->root
.type
== bfd_link_hash_undefined
)))
3527 Elf_Internal_Rela outrel
;
3529 bfd_boolean skip
, relocate
;
3532 /* When generating a shared object, these relocations
3533 are copied into the output file to be resolved at run
3540 _bfd_elf_section_offset (output_bfd
, info
, input_section
,
3542 if (outrel
.r_offset
== (bfd_vma
) -1)
3544 else if (outrel
.r_offset
== (bfd_vma
) -2)
3545 skip
= TRUE
, relocate
= TRUE
;
3546 outrel
.r_offset
+= (input_section
->output_section
->vma
3547 + input_section
->output_offset
);
3550 memset (&outrel
, 0, sizeof outrel
);
3553 && (r_type
== R_386_PC32
3555 || !SYMBOLIC_BIND (info
, h
)
3556 || !h
->def_regular
))
3557 outrel
.r_info
= ELF32_R_INFO (h
->dynindx
, r_type
);
3560 /* This symbol is local, or marked to become local. */
3562 outrel
.r_info
= ELF32_R_INFO (0, R_386_RELATIVE
);
3565 sreloc
= elf_section_data (input_section
)->sreloc
;
3567 BFD_ASSERT (sreloc
!= NULL
&& sreloc
->contents
!= NULL
);
3569 loc
= sreloc
->contents
;
3570 loc
+= sreloc
->reloc_count
++ * sizeof (Elf32_External_Rel
);
3572 bfd_elf32_swap_reloc_out (output_bfd
, &outrel
, loc
);
3574 /* If this reloc is against an external symbol, we do
3575 not want to fiddle with the addend. Otherwise, we
3576 need to include the symbol value so that it becomes
3577 an addend for the dynamic reloc. */
3586 Elf_Internal_Rela outrel
;
3590 outrel
.r_offset
= rel
->r_offset
3591 + input_section
->output_section
->vma
3592 + input_section
->output_offset
;
3593 outrel
.r_info
= ELF32_R_INFO (0, R_386_RELATIVE
);
3594 sreloc
= elf_section_data (input_section
)->sreloc
;
3597 loc
= sreloc
->contents
;
3598 loc
+= sreloc
->reloc_count
++ * sizeof (Elf32_External_Rel
);
3599 bfd_elf32_swap_reloc_out (output_bfd
, &outrel
, loc
);
3604 case R_386_TLS_GOTDESC
:
3605 case R_386_TLS_DESC_CALL
:
3606 case R_386_TLS_IE_32
:
3607 case R_386_TLS_GOTIE
:
3608 tls_type
= GOT_UNKNOWN
;
3609 if (h
== NULL
&& local_got_offsets
)
3610 tls_type
= elf_i386_local_got_tls_type (input_bfd
) [r_symndx
];
3612 tls_type
= elf_i386_hash_entry(h
)->tls_type
;
3613 if (tls_type
== GOT_TLS_IE
)
3614 tls_type
= GOT_TLS_IE_NEG
;
3616 if (! elf_i386_tls_transition (info
, input_bfd
,
3617 input_section
, contents
,
3618 symtab_hdr
, sym_hashes
,
3619 &r_type
, tls_type
, rel
,
3623 if (r_type
== R_386_TLS_LE_32
)
3625 BFD_ASSERT (! unresolved_reloc
);
3626 if (ELF32_R_TYPE (rel
->r_info
) == R_386_TLS_GD
)
3631 /* GD->LE transition. */
3632 type
= bfd_get_8 (input_bfd
, contents
+ rel
->r_offset
- 2);
3635 /* leal foo(,%reg,1), %eax; call ___tls_get_addr
3637 movl %gs:0, %eax; subl $foo@tpoff, %eax
3638 (6 byte form of subl). */
3639 memcpy (contents
+ rel
->r_offset
- 3,
3640 "\x65\xa1\0\0\0\0\x81\xe8\0\0\0", 12);
3641 roff
= rel
->r_offset
+ 5;
3645 /* leal foo(%reg), %eax; call ___tls_get_addr; nop
3647 movl %gs:0, %eax; subl $foo@tpoff, %eax
3648 (6 byte form of subl). */
3649 memcpy (contents
+ rel
->r_offset
- 2,
3650 "\x65\xa1\0\0\0\0\x81\xe8\0\0\0", 12);
3651 roff
= rel
->r_offset
+ 6;
3653 bfd_put_32 (output_bfd
, elf_i386_tpoff (info
, relocation
),
3655 /* Skip R_386_PC32/R_386_PLT32. */
3659 else if (ELF32_R_TYPE (rel
->r_info
) == R_386_TLS_GOTDESC
)
3661 /* GDesc -> LE transition.
3662 It's originally something like:
3663 leal x@tlsdesc(%ebx), %eax
3667 Registers other than %eax may be set up here. */
3672 roff
= rel
->r_offset
;
3673 val
= bfd_get_8 (input_bfd
, contents
+ roff
- 1);
3675 /* Now modify the instruction as appropriate. */
3676 /* aoliva FIXME: remove the above and xor the byte
3678 bfd_put_8 (output_bfd
, val
^ 0x86,
3679 contents
+ roff
- 1);
3680 bfd_put_32 (output_bfd
, -elf_i386_tpoff (info
, relocation
),
3684 else if (ELF32_R_TYPE (rel
->r_info
) == R_386_TLS_DESC_CALL
)
3686 /* GDesc -> LE transition.
3694 roff
= rel
->r_offset
;
3695 bfd_put_8 (output_bfd
, 0x66, contents
+ roff
);
3696 bfd_put_8 (output_bfd
, 0x90, contents
+ roff
+ 1);
3699 else if (ELF32_R_TYPE (rel
->r_info
) == R_386_TLS_IE
)
3703 /* IE->LE transition:
3704 Originally it can be one of:
3712 val
= bfd_get_8 (input_bfd
, contents
+ rel
->r_offset
- 1);
3715 /* movl foo, %eax. */
3716 bfd_put_8 (output_bfd
, 0xb8,
3717 contents
+ rel
->r_offset
- 1);
3723 type
= bfd_get_8 (input_bfd
,
3724 contents
+ rel
->r_offset
- 2);
3729 bfd_put_8 (output_bfd
, 0xc7,
3730 contents
+ rel
->r_offset
- 2);
3731 bfd_put_8 (output_bfd
,
3732 0xc0 | ((val
>> 3) & 7),
3733 contents
+ rel
->r_offset
- 1);
3737 bfd_put_8 (output_bfd
, 0x81,
3738 contents
+ rel
->r_offset
- 2);
3739 bfd_put_8 (output_bfd
,
3740 0xc0 | ((val
>> 3) & 7),
3741 contents
+ rel
->r_offset
- 1);
3748 bfd_put_32 (output_bfd
, -elf_i386_tpoff (info
, relocation
),
3749 contents
+ rel
->r_offset
);
3754 unsigned int val
, type
;
3756 /* {IE_32,GOTIE}->LE transition:
3757 Originally it can be one of:
3758 subl foo(%reg1), %reg2
3759 movl foo(%reg1), %reg2
3760 addl foo(%reg1), %reg2
3763 movl $foo, %reg2 (6 byte form)
3764 addl $foo, %reg2. */
3765 type
= bfd_get_8 (input_bfd
, contents
+ rel
->r_offset
- 2);
3766 val
= bfd_get_8 (input_bfd
, contents
+ rel
->r_offset
- 1);
3770 bfd_put_8 (output_bfd
, 0xc7,
3771 contents
+ rel
->r_offset
- 2);
3772 bfd_put_8 (output_bfd
, 0xc0 | ((val
>> 3) & 7),
3773 contents
+ rel
->r_offset
- 1);
3775 else if (type
== 0x2b)
3778 bfd_put_8 (output_bfd
, 0x81,
3779 contents
+ rel
->r_offset
- 2);
3780 bfd_put_8 (output_bfd
, 0xe8 | ((val
>> 3) & 7),
3781 contents
+ rel
->r_offset
- 1);
3783 else if (type
== 0x03)
3786 bfd_put_8 (output_bfd
, 0x81,
3787 contents
+ rel
->r_offset
- 2);
3788 bfd_put_8 (output_bfd
, 0xc0 | ((val
>> 3) & 7),
3789 contents
+ rel
->r_offset
- 1);
3793 if (ELF32_R_TYPE (rel
->r_info
) == R_386_TLS_GOTIE
)
3794 bfd_put_32 (output_bfd
, -elf_i386_tpoff (info
, relocation
),
3795 contents
+ rel
->r_offset
);
3797 bfd_put_32 (output_bfd
, elf_i386_tpoff (info
, relocation
),
3798 contents
+ rel
->r_offset
);
3803 if (htab
->sgot
== NULL
)
3808 off
= h
->got
.offset
;
3809 offplt
= elf_i386_hash_entry (h
)->tlsdesc_got
;
3813 if (local_got_offsets
== NULL
)
3816 off
= local_got_offsets
[r_symndx
];
3817 offplt
= local_tlsdesc_gotents
[r_symndx
];
3824 Elf_Internal_Rela outrel
;
3829 if (htab
->srelgot
== NULL
)
3832 indx
= h
&& h
->dynindx
!= -1 ? h
->dynindx
: 0;
3834 if (GOT_TLS_GDESC_P (tls_type
))
3836 outrel
.r_info
= ELF32_R_INFO (indx
, R_386_TLS_DESC
);
3837 BFD_ASSERT (htab
->sgotplt_jump_table_size
+ offplt
+ 8
3838 <= htab
->sgotplt
->size
);
3839 outrel
.r_offset
= (htab
->sgotplt
->output_section
->vma
3840 + htab
->sgotplt
->output_offset
3842 + htab
->sgotplt_jump_table_size
);
3843 sreloc
= htab
->srelplt
;
3844 loc
= sreloc
->contents
;
3845 loc
+= (htab
->next_tls_desc_index
++
3846 * sizeof (Elf32_External_Rel
));
3847 BFD_ASSERT (loc
+ sizeof (Elf32_External_Rel
)
3848 <= sreloc
->contents
+ sreloc
->size
);
3849 bfd_elf32_swap_reloc_out (output_bfd
, &outrel
, loc
);
3852 BFD_ASSERT (! unresolved_reloc
);
3853 bfd_put_32 (output_bfd
,
3854 relocation
- elf_i386_dtpoff_base (info
),
3855 htab
->sgotplt
->contents
+ offplt
3856 + htab
->sgotplt_jump_table_size
+ 4);
3860 bfd_put_32 (output_bfd
, 0,
3861 htab
->sgotplt
->contents
+ offplt
3862 + htab
->sgotplt_jump_table_size
+ 4);
3866 sreloc
= htab
->srelgot
;
3868 outrel
.r_offset
= (htab
->sgot
->output_section
->vma
3869 + htab
->sgot
->output_offset
+ off
);
3871 if (GOT_TLS_GD_P (tls_type
))
3872 dr_type
= R_386_TLS_DTPMOD32
;
3873 else if (GOT_TLS_GDESC_P (tls_type
))
3875 else if (tls_type
== GOT_TLS_IE_POS
)
3876 dr_type
= R_386_TLS_TPOFF
;
3878 dr_type
= R_386_TLS_TPOFF32
;
3880 if (dr_type
== R_386_TLS_TPOFF
&& indx
== 0)
3881 bfd_put_32 (output_bfd
,
3882 relocation
- elf_i386_dtpoff_base (info
),
3883 htab
->sgot
->contents
+ off
);
3884 else if (dr_type
== R_386_TLS_TPOFF32
&& indx
== 0)
3885 bfd_put_32 (output_bfd
,
3886 elf_i386_dtpoff_base (info
) - relocation
,
3887 htab
->sgot
->contents
+ off
);
3888 else if (dr_type
!= R_386_TLS_DESC
)
3889 bfd_put_32 (output_bfd
, 0,
3890 htab
->sgot
->contents
+ off
);
3891 outrel
.r_info
= ELF32_R_INFO (indx
, dr_type
);
3893 loc
= sreloc
->contents
;
3894 loc
+= sreloc
->reloc_count
++ * sizeof (Elf32_External_Rel
);
3895 BFD_ASSERT (loc
+ sizeof (Elf32_External_Rel
)
3896 <= sreloc
->contents
+ sreloc
->size
);
3897 bfd_elf32_swap_reloc_out (output_bfd
, &outrel
, loc
);
3899 if (GOT_TLS_GD_P (tls_type
))
3903 BFD_ASSERT (! unresolved_reloc
);
3904 bfd_put_32 (output_bfd
,
3905 relocation
- elf_i386_dtpoff_base (info
),
3906 htab
->sgot
->contents
+ off
+ 4);
3910 bfd_put_32 (output_bfd
, 0,
3911 htab
->sgot
->contents
+ off
+ 4);
3912 outrel
.r_info
= ELF32_R_INFO (indx
,
3913 R_386_TLS_DTPOFF32
);
3914 outrel
.r_offset
+= 4;
3915 sreloc
->reloc_count
++;
3916 loc
+= sizeof (Elf32_External_Rel
);
3917 BFD_ASSERT (loc
+ sizeof (Elf32_External_Rel
)
3918 <= sreloc
->contents
+ sreloc
->size
);
3919 bfd_elf32_swap_reloc_out (output_bfd
, &outrel
, loc
);
3922 else if (tls_type
== GOT_TLS_IE_BOTH
)
3924 bfd_put_32 (output_bfd
,
3926 ? relocation
- elf_i386_dtpoff_base (info
)
3928 htab
->sgot
->contents
+ off
+ 4);
3929 outrel
.r_info
= ELF32_R_INFO (indx
, R_386_TLS_TPOFF
);
3930 outrel
.r_offset
+= 4;
3931 sreloc
->reloc_count
++;
3932 loc
+= sizeof (Elf32_External_Rel
);
3933 bfd_elf32_swap_reloc_out (output_bfd
, &outrel
, loc
);
3940 local_got_offsets
[r_symndx
] |= 1;
3943 if (off
>= (bfd_vma
) -2
3944 && ! GOT_TLS_GDESC_P (tls_type
))
3946 if (r_type
== R_386_TLS_GOTDESC
3947 || r_type
== R_386_TLS_DESC_CALL
)
3949 relocation
= htab
->sgotplt_jump_table_size
+ offplt
;
3950 unresolved_reloc
= FALSE
;
3952 else if (r_type
== ELF32_R_TYPE (rel
->r_info
))
3954 bfd_vma g_o_t
= htab
->sgotplt
->output_section
->vma
3955 + htab
->sgotplt
->output_offset
;
3956 relocation
= htab
->sgot
->output_section
->vma
3957 + htab
->sgot
->output_offset
+ off
- g_o_t
;
3958 if ((r_type
== R_386_TLS_IE
|| r_type
== R_386_TLS_GOTIE
)
3959 && tls_type
== GOT_TLS_IE_BOTH
)
3961 if (r_type
== R_386_TLS_IE
)
3962 relocation
+= g_o_t
;
3963 unresolved_reloc
= FALSE
;
3965 else if (ELF32_R_TYPE (rel
->r_info
) == R_386_TLS_GD
)
3967 unsigned int val
, type
;
3970 /* GD->IE transition. */
3971 type
= bfd_get_8 (input_bfd
, contents
+ rel
->r_offset
- 2);
3972 val
= bfd_get_8 (input_bfd
, contents
+ rel
->r_offset
- 1);
3975 /* leal foo(,%reg,1), %eax; call ___tls_get_addr
3977 movl %gs:0, %eax; subl $foo@gottpoff(%reg), %eax. */
3979 roff
= rel
->r_offset
- 3;
3983 /* leal foo(%reg), %eax; call ___tls_get_addr; nop
3985 movl %gs:0, %eax; subl $foo@gottpoff(%reg), %eax. */
3986 roff
= rel
->r_offset
- 2;
3988 memcpy (contents
+ roff
,
3989 "\x65\xa1\0\0\0\0\x2b\x80\0\0\0", 12);
3990 contents
[roff
+ 7] = 0x80 | (val
& 7);
3991 /* If foo is used only with foo@gotntpoff(%reg) and
3992 foo@indntpoff, but not with foo@gottpoff(%reg), change
3993 subl $foo@gottpoff(%reg), %eax
3995 addl $foo@gotntpoff(%reg), %eax. */
3996 if (tls_type
== GOT_TLS_IE_POS
)
3997 contents
[roff
+ 6] = 0x03;
3998 bfd_put_32 (output_bfd
,
3999 htab
->sgot
->output_section
->vma
4000 + htab
->sgot
->output_offset
+ off
4001 - htab
->sgotplt
->output_section
->vma
4002 - htab
->sgotplt
->output_offset
,
4003 contents
+ roff
+ 8);
4004 /* Skip R_386_PLT32. */
4008 else if (ELF32_R_TYPE (rel
->r_info
) == R_386_TLS_GOTDESC
)
4010 /* GDesc -> IE transition.
4011 It's originally something like:
4012 leal x@tlsdesc(%ebx), %eax
4015 movl x@gotntpoff(%ebx), %eax # before xchg %ax,%ax
4017 movl x@gottpoff(%ebx), %eax # before negl %eax
4019 Registers other than %eax may be set up here. */
4023 /* First, make sure it's a leal adding ebx to a 32-bit
4024 offset into any register, although it's probably
4025 almost always going to be eax. */
4026 roff
= rel
->r_offset
;
4028 /* Now modify the instruction as appropriate. */
4029 /* To turn a leal into a movl in the form we use it, it
4030 suffices to change the first byte from 0x8d to 0x8b.
4031 aoliva FIXME: should we decide to keep the leal, all
4032 we have to do is remove the statement below, and
4033 adjust the relaxation of R_386_TLS_DESC_CALL. */
4034 bfd_put_8 (output_bfd
, 0x8b, contents
+ roff
- 2);
4036 if (tls_type
== GOT_TLS_IE_BOTH
)
4039 bfd_put_32 (output_bfd
,
4040 htab
->sgot
->output_section
->vma
4041 + htab
->sgot
->output_offset
+ off
4042 - htab
->sgotplt
->output_section
->vma
4043 - htab
->sgotplt
->output_offset
,
4047 else if (ELF32_R_TYPE (rel
->r_info
) == R_386_TLS_DESC_CALL
)
4049 /* GDesc -> IE transition.
4057 depending on how we transformed the TLS_GOTDESC above.
4062 roff
= rel
->r_offset
;
4064 /* Now modify the instruction as appropriate. */
4065 if (tls_type
!= GOT_TLS_IE_NEG
)
4068 bfd_put_8 (output_bfd
, 0x66, contents
+ roff
);
4069 bfd_put_8 (output_bfd
, 0x90, contents
+ roff
+ 1);
4074 bfd_put_8 (output_bfd
, 0xf7, contents
+ roff
);
4075 bfd_put_8 (output_bfd
, 0xd8, contents
+ roff
+ 1);
4085 if (! elf_i386_tls_transition (info
, input_bfd
,
4086 input_section
, contents
,
4087 symtab_hdr
, sym_hashes
,
4088 &r_type
, GOT_UNKNOWN
, rel
,
4092 if (r_type
!= R_386_TLS_LDM
)
4094 /* LD->LE transition:
4095 leal foo(%reg), %eax; call ___tls_get_addr.
4097 movl %gs:0, %eax; nop; leal 0(%esi,1), %esi. */
4098 BFD_ASSERT (r_type
== R_386_TLS_LE_32
);
4099 memcpy (contents
+ rel
->r_offset
- 2,
4100 "\x65\xa1\0\0\0\0\x90\x8d\x74\x26", 11);
4101 /* Skip R_386_PC32/R_386_PLT32. */
4106 if (htab
->sgot
== NULL
)
4109 off
= htab
->tls_ldm_got
.offset
;
4114 Elf_Internal_Rela outrel
;
4117 if (htab
->srelgot
== NULL
)
4120 outrel
.r_offset
= (htab
->sgot
->output_section
->vma
4121 + htab
->sgot
->output_offset
+ off
);
4123 bfd_put_32 (output_bfd
, 0,
4124 htab
->sgot
->contents
+ off
);
4125 bfd_put_32 (output_bfd
, 0,
4126 htab
->sgot
->contents
+ off
+ 4);
4127 outrel
.r_info
= ELF32_R_INFO (0, R_386_TLS_DTPMOD32
);
4128 loc
= htab
->srelgot
->contents
;
4129 loc
+= htab
->srelgot
->reloc_count
++ * sizeof (Elf32_External_Rel
);
4130 bfd_elf32_swap_reloc_out (output_bfd
, &outrel
, loc
);
4131 htab
->tls_ldm_got
.offset
|= 1;
4133 relocation
= htab
->sgot
->output_section
->vma
4134 + htab
->sgot
->output_offset
+ off
4135 - htab
->sgotplt
->output_section
->vma
4136 - htab
->sgotplt
->output_offset
;
4137 unresolved_reloc
= FALSE
;
4140 case R_386_TLS_LDO_32
:
4141 if (info
->shared
|| (input_section
->flags
& SEC_CODE
) == 0)
4142 relocation
-= elf_i386_dtpoff_base (info
);
4144 /* When converting LDO to LE, we must negate. */
4145 relocation
= -elf_i386_tpoff (info
, relocation
);
4148 case R_386_TLS_LE_32
:
4152 Elf_Internal_Rela outrel
;
4157 outrel
.r_offset
= rel
->r_offset
4158 + input_section
->output_section
->vma
4159 + input_section
->output_offset
;
4160 if (h
!= NULL
&& h
->dynindx
!= -1)
4164 if (r_type
== R_386_TLS_LE_32
)
4165 outrel
.r_info
= ELF32_R_INFO (indx
, R_386_TLS_TPOFF32
);
4167 outrel
.r_info
= ELF32_R_INFO (indx
, R_386_TLS_TPOFF
);
4168 sreloc
= elf_section_data (input_section
)->sreloc
;
4171 loc
= sreloc
->contents
;
4172 loc
+= sreloc
->reloc_count
++ * sizeof (Elf32_External_Rel
);
4173 bfd_elf32_swap_reloc_out (output_bfd
, &outrel
, loc
);
4176 else if (r_type
== R_386_TLS_LE_32
)
4177 relocation
= elf_i386_dtpoff_base (info
) - relocation
;
4179 relocation
-= elf_i386_dtpoff_base (info
);
4181 else if (r_type
== R_386_TLS_LE_32
)
4182 relocation
= elf_i386_tpoff (info
, relocation
);
4184 relocation
= -elf_i386_tpoff (info
, relocation
);
4191 /* Dynamic relocs are not propagated for SEC_DEBUGGING sections
4192 because such sections are not SEC_ALLOC and thus ld.so will
4193 not process them. */
4194 if (unresolved_reloc
4195 && !((input_section
->flags
& SEC_DEBUGGING
) != 0
4198 (*_bfd_error_handler
)
4199 (_("%B(%A+0x%lx): unresolvable %s relocation against symbol `%s'"),
4202 (long) rel
->r_offset
,
4204 h
->root
.root
.string
);
4209 r
= _bfd_final_link_relocate (howto
, input_bfd
, input_section
,
4210 contents
, rel
->r_offset
,
4213 if (r
!= bfd_reloc_ok
)
4218 name
= h
->root
.root
.string
;
4221 name
= bfd_elf_string_from_elf_section (input_bfd
,
4222 symtab_hdr
->sh_link
,
4227 name
= bfd_section_name (input_bfd
, sec
);
4230 if (r
== bfd_reloc_overflow
)
4232 if (! ((*info
->callbacks
->reloc_overflow
)
4233 (info
, (h
? &h
->root
: NULL
), name
, howto
->name
,
4234 (bfd_vma
) 0, input_bfd
, input_section
,
4240 (*_bfd_error_handler
)
4241 (_("%B(%A+0x%lx): reloc against `%s': error %d"),
4242 input_bfd
, input_section
,
4243 (long) rel
->r_offset
, name
, (int) r
);
4252 /* Finish up dynamic symbol handling. We set the contents of various
4253 dynamic sections here. */
4256 elf_i386_finish_dynamic_symbol (bfd
*output_bfd
,
4257 struct bfd_link_info
*info
,
4258 struct elf_link_hash_entry
*h
,
4259 Elf_Internal_Sym
*sym
)
4261 struct elf_i386_link_hash_table
*htab
;
4263 htab
= elf_i386_hash_table (info
);
4265 if (h
->plt
.offset
!= (bfd_vma
) -1)
4269 Elf_Internal_Rela rel
;
4271 asection
*plt
, *gotplt
, *relplt
;
4273 /* When building a static executable, use .iplt, .igot.plt and
4274 .rel.iplt sections for STT_GNU_IFUNC symbols. */
4275 if (htab
->splt
!= NULL
)
4278 gotplt
= htab
->sgotplt
;
4279 relplt
= htab
->srelplt
;
4284 gotplt
= htab
->igotplt
;
4285 relplt
= htab
->irelplt
;
4288 /* This symbol has an entry in the procedure linkage table. Set
4291 if ((h
->dynindx
== -1
4292 && !((h
->forced_local
|| info
->executable
)
4294 && h
->type
== STT_GNU_IFUNC
))
4300 /* Get the index in the procedure linkage table which
4301 corresponds to this symbol. This is the index of this symbol
4302 in all the symbols for which we are making plt entries. The
4303 first entry in the procedure linkage table is reserved.
4305 Get the offset into the .got table of the entry that
4306 corresponds to this function. Each .got entry is 4 bytes.
4307 The first three are reserved.
4309 For static executables, we don't reserve anything. */
4311 if (plt
== htab
->splt
)
4313 plt_index
= h
->plt
.offset
/ PLT_ENTRY_SIZE
- 1;
4314 got_offset
= (plt_index
+ 3) * 4;
4318 plt_index
= h
->plt
.offset
/ PLT_ENTRY_SIZE
;
4319 got_offset
= plt_index
* 4;
4322 /* Fill in the entry in the procedure linkage table. */
4325 memcpy (plt
->contents
+ h
->plt
.offset
, elf_i386_plt_entry
,
4327 bfd_put_32 (output_bfd
,
4328 (gotplt
->output_section
->vma
4329 + gotplt
->output_offset
4331 plt
->contents
+ h
->plt
.offset
+ 2);
4333 if (htab
->is_vxworks
)
4335 int s
, k
, reloc_index
;
4337 /* Create the R_386_32 relocation referencing the GOT
4338 for this PLT entry. */
4340 /* S: Current slot number (zero-based). */
4341 s
= (h
->plt
.offset
- PLT_ENTRY_SIZE
) / PLT_ENTRY_SIZE
;
4342 /* K: Number of relocations for PLTResolve. */
4344 k
= PLTRESOLVE_RELOCS_SHLIB
;
4346 k
= PLTRESOLVE_RELOCS
;
4347 /* Skip the PLTresolve relocations, and the relocations for
4348 the other PLT slots. */
4349 reloc_index
= k
+ s
* PLT_NON_JUMP_SLOT_RELOCS
;
4350 loc
= (htab
->srelplt2
->contents
+ reloc_index
4351 * sizeof (Elf32_External_Rel
));
4353 rel
.r_offset
= (htab
->splt
->output_section
->vma
4354 + htab
->splt
->output_offset
4355 + h
->plt
.offset
+ 2),
4356 rel
.r_info
= ELF32_R_INFO (htab
->elf
.hgot
->indx
, R_386_32
);
4357 bfd_elf32_swap_reloc_out (output_bfd
, &rel
, loc
);
4359 /* Create the R_386_32 relocation referencing the beginning of
4360 the PLT for this GOT entry. */
4361 rel
.r_offset
= (htab
->sgotplt
->output_section
->vma
4362 + htab
->sgotplt
->output_offset
4364 rel
.r_info
= ELF32_R_INFO (htab
->elf
.hplt
->indx
, R_386_32
);
4365 bfd_elf32_swap_reloc_out (output_bfd
, &rel
,
4366 loc
+ sizeof (Elf32_External_Rel
));
4371 memcpy (plt
->contents
+ h
->plt
.offset
, elf_i386_pic_plt_entry
,
4373 bfd_put_32 (output_bfd
, got_offset
,
4374 plt
->contents
+ h
->plt
.offset
+ 2);
4377 /* Don't fill PLT entry for static executables. */
4378 if (plt
== htab
->splt
)
4380 bfd_put_32 (output_bfd
, plt_index
* sizeof (Elf32_External_Rel
),
4381 plt
->contents
+ h
->plt
.offset
+ 7);
4382 bfd_put_32 (output_bfd
, - (h
->plt
.offset
+ PLT_ENTRY_SIZE
),
4383 plt
->contents
+ h
->plt
.offset
+ 12);
4386 /* Fill in the entry in the global offset table. */
4387 bfd_put_32 (output_bfd
,
4388 (plt
->output_section
->vma
4389 + plt
->output_offset
4392 gotplt
->contents
+ got_offset
);
4394 /* Fill in the entry in the .rel.plt section. */
4395 rel
.r_offset
= (gotplt
->output_section
->vma
4396 + gotplt
->output_offset
4398 if (h
->dynindx
== -1
4399 || ((info
->executable
4400 || ELF_ST_VISIBILITY (h
->other
) != STV_DEFAULT
)
4402 && h
->type
== STT_GNU_IFUNC
))
4404 /* If an STT_GNU_IFUNC symbol is locally defined, generate
4405 R_386_IRELATIVE instead of R_386_JUMP_SLOT. Store addend
4406 in the .got.plt section. */
4407 bfd_put_32 (output_bfd
,
4408 (h
->root
.u
.def
.value
4409 + h
->root
.u
.def
.section
->output_section
->vma
4410 + h
->root
.u
.def
.section
->output_offset
),
4411 gotplt
->contents
+ got_offset
);
4412 rel
.r_info
= ELF32_R_INFO (0, R_386_IRELATIVE
);
4415 rel
.r_info
= ELF32_R_INFO (h
->dynindx
, R_386_JUMP_SLOT
);
4416 loc
= relplt
->contents
+ plt_index
* sizeof (Elf32_External_Rel
);
4417 bfd_elf32_swap_reloc_out (output_bfd
, &rel
, loc
);
4419 if (!h
->def_regular
)
4421 /* Mark the symbol as undefined, rather than as defined in
4422 the .plt section. Leave the value if there were any
4423 relocations where pointer equality matters (this is a clue
4424 for the dynamic linker, to make function pointer
4425 comparisons work between an application and shared
4426 library), otherwise set it to zero. If a function is only
4427 called from a binary, there is no need to slow down
4428 shared libraries because of that. */
4429 sym
->st_shndx
= SHN_UNDEF
;
4430 if (!h
->pointer_equality_needed
)
4435 if (h
->got
.offset
!= (bfd_vma
) -1
4436 && ! GOT_TLS_GD_ANY_P (elf_i386_hash_entry(h
)->tls_type
)
4437 && (elf_i386_hash_entry(h
)->tls_type
& GOT_TLS_IE
) == 0)
4439 Elf_Internal_Rela rel
;
4442 /* This symbol has an entry in the global offset table. Set it
4445 if (htab
->sgot
== NULL
|| htab
->srelgot
== NULL
)
4448 rel
.r_offset
= (htab
->sgot
->output_section
->vma
4449 + htab
->sgot
->output_offset
4450 + (h
->got
.offset
& ~(bfd_vma
) 1));
4452 /* If this is a static link, or it is a -Bsymbolic link and the
4453 symbol is defined locally or was forced to be local because
4454 of a version file, we just want to emit a RELATIVE reloc.
4455 The entry in the global offset table will already have been
4456 initialized in the relocate_section function. */
4458 && h
->type
== STT_GNU_IFUNC
)
4462 /* Generate R_386_GLOB_DAT. */
4467 if (!h
->pointer_equality_needed
)
4470 /* For non-shared object, we can't use .got.plt, which
4471 contains the real function addres if we need pointer
4472 equality. We load the GOT entry with the PLT entry. */
4473 asection
*plt
= htab
->splt
? htab
->splt
: htab
->iplt
;
4474 bfd_put_32 (output_bfd
,
4475 (plt
->output_section
->vma
4476 + plt
->output_offset
+ h
->plt
.offset
),
4477 htab
->sgot
->contents
+ h
->got
.offset
);
4481 else if (info
->shared
4482 && SYMBOL_REFERENCES_LOCAL (info
, h
))
4484 BFD_ASSERT((h
->got
.offset
& 1) != 0);
4485 rel
.r_info
= ELF32_R_INFO (0, R_386_RELATIVE
);
4489 BFD_ASSERT((h
->got
.offset
& 1) == 0);
4491 bfd_put_32 (output_bfd
, (bfd_vma
) 0,
4492 htab
->sgot
->contents
+ h
->got
.offset
);
4493 rel
.r_info
= ELF32_R_INFO (h
->dynindx
, R_386_GLOB_DAT
);
4496 loc
= htab
->srelgot
->contents
;
4497 loc
+= htab
->srelgot
->reloc_count
++ * sizeof (Elf32_External_Rel
);
4498 bfd_elf32_swap_reloc_out (output_bfd
, &rel
, loc
);
4503 Elf_Internal_Rela rel
;
4506 /* This symbol needs a copy reloc. Set it up. */
4508 if (h
->dynindx
== -1
4509 || (h
->root
.type
!= bfd_link_hash_defined
4510 && h
->root
.type
!= bfd_link_hash_defweak
)
4511 || htab
->srelbss
== NULL
)
4514 rel
.r_offset
= (h
->root
.u
.def
.value
4515 + h
->root
.u
.def
.section
->output_section
->vma
4516 + h
->root
.u
.def
.section
->output_offset
);
4517 rel
.r_info
= ELF32_R_INFO (h
->dynindx
, R_386_COPY
);
4518 loc
= htab
->srelbss
->contents
;
4519 loc
+= htab
->srelbss
->reloc_count
++ * sizeof (Elf32_External_Rel
);
4520 bfd_elf32_swap_reloc_out (output_bfd
, &rel
, loc
);
4523 /* Mark _DYNAMIC and _GLOBAL_OFFSET_TABLE_ as absolute. SYM may
4524 be NULL for local symbols.
4526 On VxWorks, the _GLOBAL_OFFSET_TABLE_ symbol is not absolute: it
4527 is relative to the ".got" section. */
4529 && (strcmp (h
->root
.root
.string
, "_DYNAMIC") == 0
4530 || (!htab
->is_vxworks
&& h
== htab
->elf
.hgot
)))
4531 sym
->st_shndx
= SHN_ABS
;
4536 /* Finish up local dynamic symbol handling. We set the contents of
4537 various dynamic sections here. */
4540 elf_i386_finish_local_dynamic_symbol (void **slot
, void *inf
)
4542 struct elf_link_hash_entry
*h
4543 = (struct elf_link_hash_entry
*) *slot
;
4544 struct bfd_link_info
*info
4545 = (struct bfd_link_info
*) inf
;
4547 return elf_i386_finish_dynamic_symbol (info
->output_bfd
, info
,
4551 /* Used to decide how to sort relocs in an optimal manner for the
4552 dynamic linker, before writing them out. */
4554 static enum elf_reloc_type_class
4555 elf_i386_reloc_type_class (const Elf_Internal_Rela
*rela
)
4557 switch (ELF32_R_TYPE (rela
->r_info
))
4559 case R_386_RELATIVE
:
4560 return reloc_class_relative
;
4561 case R_386_JUMP_SLOT
:
4562 return reloc_class_plt
;
4564 return reloc_class_copy
;
4566 return reloc_class_normal
;
4570 /* Finish up the dynamic sections. */
4573 elf_i386_finish_dynamic_sections (bfd
*output_bfd
,
4574 struct bfd_link_info
*info
)
4576 struct elf_i386_link_hash_table
*htab
;
4580 htab
= elf_i386_hash_table (info
);
4581 dynobj
= htab
->elf
.dynobj
;
4582 sdyn
= bfd_get_section_by_name (dynobj
, ".dynamic");
4584 if (htab
->elf
.dynamic_sections_created
)
4586 Elf32_External_Dyn
*dyncon
, *dynconend
;
4588 if (sdyn
== NULL
|| htab
->sgot
== NULL
)
4591 dyncon
= (Elf32_External_Dyn
*) sdyn
->contents
;
4592 dynconend
= (Elf32_External_Dyn
*) (sdyn
->contents
+ sdyn
->size
);
4593 for (; dyncon
< dynconend
; dyncon
++)
4595 Elf_Internal_Dyn dyn
;
4598 bfd_elf32_swap_dyn_in (dynobj
, dyncon
, &dyn
);
4603 if (htab
->is_vxworks
4604 && elf_vxworks_finish_dynamic_entry (output_bfd
, &dyn
))
4610 dyn
.d_un
.d_ptr
= s
->output_section
->vma
+ s
->output_offset
;
4615 dyn
.d_un
.d_ptr
= s
->output_section
->vma
+ s
->output_offset
;
4620 dyn
.d_un
.d_val
= s
->size
;
4624 /* My reading of the SVR4 ABI indicates that the
4625 procedure linkage table relocs (DT_JMPREL) should be
4626 included in the overall relocs (DT_REL). This is
4627 what Solaris does. However, UnixWare can not handle
4628 that case. Therefore, we override the DT_RELSZ entry
4629 here to make it not include the JMPREL relocs. */
4633 dyn
.d_un
.d_val
-= s
->size
;
4637 /* We may not be using the standard ELF linker script.
4638 If .rel.plt is the first .rel section, we adjust
4639 DT_REL to not include it. */
4643 if (dyn
.d_un
.d_ptr
!= s
->output_section
->vma
+ s
->output_offset
)
4645 dyn
.d_un
.d_ptr
+= s
->size
;
4649 bfd_elf32_swap_dyn_out (output_bfd
, &dyn
, dyncon
);
4652 /* Fill in the first entry in the procedure linkage table. */
4653 if (htab
->splt
&& htab
->splt
->size
> 0)
4657 memcpy (htab
->splt
->contents
, elf_i386_pic_plt0_entry
,
4658 sizeof (elf_i386_pic_plt0_entry
));
4659 memset (htab
->splt
->contents
+ sizeof (elf_i386_pic_plt0_entry
),
4660 htab
->plt0_pad_byte
,
4661 PLT_ENTRY_SIZE
- sizeof (elf_i386_pic_plt0_entry
));
4665 memcpy (htab
->splt
->contents
, elf_i386_plt0_entry
,
4666 sizeof(elf_i386_plt0_entry
));
4667 memset (htab
->splt
->contents
+ sizeof (elf_i386_plt0_entry
),
4668 htab
->plt0_pad_byte
,
4669 PLT_ENTRY_SIZE
- sizeof (elf_i386_plt0_entry
));
4670 bfd_put_32 (output_bfd
,
4671 (htab
->sgotplt
->output_section
->vma
4672 + htab
->sgotplt
->output_offset
4674 htab
->splt
->contents
+ 2);
4675 bfd_put_32 (output_bfd
,
4676 (htab
->sgotplt
->output_section
->vma
4677 + htab
->sgotplt
->output_offset
4679 htab
->splt
->contents
+ 8);
4681 if (htab
->is_vxworks
)
4683 Elf_Internal_Rela rel
;
4685 /* Generate a relocation for _GLOBAL_OFFSET_TABLE_ + 4.
4686 On IA32 we use REL relocations so the addend goes in
4687 the PLT directly. */
4688 rel
.r_offset
= (htab
->splt
->output_section
->vma
4689 + htab
->splt
->output_offset
4691 rel
.r_info
= ELF32_R_INFO (htab
->elf
.hgot
->indx
, R_386_32
);
4692 bfd_elf32_swap_reloc_out (output_bfd
, &rel
,
4693 htab
->srelplt2
->contents
);
4694 /* Generate a relocation for _GLOBAL_OFFSET_TABLE_ + 8. */
4695 rel
.r_offset
= (htab
->splt
->output_section
->vma
4696 + htab
->splt
->output_offset
4698 rel
.r_info
= ELF32_R_INFO (htab
->elf
.hgot
->indx
, R_386_32
);
4699 bfd_elf32_swap_reloc_out (output_bfd
, &rel
,
4700 htab
->srelplt2
->contents
+
4701 sizeof (Elf32_External_Rel
));
4705 /* UnixWare sets the entsize of .plt to 4, although that doesn't
4706 really seem like the right value. */
4707 elf_section_data (htab
->splt
->output_section
)
4708 ->this_hdr
.sh_entsize
= 4;
4710 /* Correct the .rel.plt.unloaded relocations. */
4711 if (htab
->is_vxworks
&& !info
->shared
)
4713 int num_plts
= (htab
->splt
->size
/ PLT_ENTRY_SIZE
) - 1;
4716 p
= htab
->srelplt2
->contents
;
4718 p
+= PLTRESOLVE_RELOCS_SHLIB
* sizeof (Elf32_External_Rel
);
4720 p
+= PLTRESOLVE_RELOCS
* sizeof (Elf32_External_Rel
);
4722 for (; num_plts
; num_plts
--)
4724 Elf_Internal_Rela rel
;
4725 bfd_elf32_swap_reloc_in (output_bfd
, p
, &rel
);
4726 rel
.r_info
= ELF32_R_INFO (htab
->elf
.hgot
->indx
, R_386_32
);
4727 bfd_elf32_swap_reloc_out (output_bfd
, &rel
, p
);
4728 p
+= sizeof (Elf32_External_Rel
);
4730 bfd_elf32_swap_reloc_in (output_bfd
, p
, &rel
);
4731 rel
.r_info
= ELF32_R_INFO (htab
->elf
.hplt
->indx
, R_386_32
);
4732 bfd_elf32_swap_reloc_out (output_bfd
, &rel
, p
);
4733 p
+= sizeof (Elf32_External_Rel
);
4741 /* Fill in the first three entries in the global offset table. */
4742 if (htab
->sgotplt
->size
> 0)
4744 bfd_put_32 (output_bfd
,
4746 : sdyn
->output_section
->vma
+ sdyn
->output_offset
),
4747 htab
->sgotplt
->contents
);
4748 bfd_put_32 (output_bfd
, 0, htab
->sgotplt
->contents
+ 4);
4749 bfd_put_32 (output_bfd
, 0, htab
->sgotplt
->contents
+ 8);
4752 elf_section_data (htab
->sgotplt
->output_section
)->this_hdr
.sh_entsize
= 4;
4755 if (htab
->sgot
&& htab
->sgot
->size
> 0)
4756 elf_section_data (htab
->sgot
->output_section
)->this_hdr
.sh_entsize
= 4;
4758 /* Fill PLT and GOT entries for local STT_GNU_IFUNC symbols. */
4759 htab_traverse (htab
->loc_hash_table
,
4760 elf_i386_finish_local_dynamic_symbol
,
4766 /* Return address for Ith PLT stub in section PLT, for relocation REL
4767 or (bfd_vma) -1 if it should not be included. */
4770 elf_i386_plt_sym_val (bfd_vma i
, const asection
*plt
,
4771 const arelent
*rel ATTRIBUTE_UNUSED
)
4773 return plt
->vma
+ (i
+ 1) * PLT_ENTRY_SIZE
;
4776 /* Return TRUE if symbol should be hashed in the `.gnu.hash' section. */
4779 elf_i386_hash_symbol (struct elf_link_hash_entry
*h
)
4781 if (h
->plt
.offset
!= (bfd_vma
) -1
4783 && !h
->pointer_equality_needed
)
4786 return _bfd_elf_hash_symbol (h
);
4789 /* Hook called by the linker routine which adds symbols from an object
4793 elf_i386_add_symbol_hook (bfd
* abfd ATTRIBUTE_UNUSED
,
4794 struct bfd_link_info
* info ATTRIBUTE_UNUSED
,
4795 Elf_Internal_Sym
* sym
,
4796 const char ** namep ATTRIBUTE_UNUSED
,
4797 flagword
* flagsp ATTRIBUTE_UNUSED
,
4798 asection
** secp ATTRIBUTE_UNUSED
,
4799 bfd_vma
* valp ATTRIBUTE_UNUSED
)
4801 if (ELF_ST_TYPE (sym
->st_info
) == STT_GNU_IFUNC
)
4802 elf_tdata (info
->output_bfd
)->has_ifunc_symbols
= TRUE
;
4807 #define TARGET_LITTLE_SYM bfd_elf32_i386_vec
4808 #define TARGET_LITTLE_NAME "elf32-i386"
4809 #define ELF_ARCH bfd_arch_i386
4810 #define ELF_MACHINE_CODE EM_386
4811 #define ELF_MAXPAGESIZE 0x1000
4813 #define elf_backend_can_gc_sections 1
4814 #define elf_backend_can_refcount 1
4815 #define elf_backend_want_got_plt 1
4816 #define elf_backend_plt_readonly 1
4817 #define elf_backend_want_plt_sym 0
4818 #define elf_backend_got_header_size 12
4820 /* Support RELA for objdump of prelink objects. */
4821 #define elf_info_to_howto elf_i386_info_to_howto_rel
4822 #define elf_info_to_howto_rel elf_i386_info_to_howto_rel
4824 #define bfd_elf32_mkobject elf_i386_mkobject
4826 #define bfd_elf32_bfd_is_local_label_name elf_i386_is_local_label_name
4827 #define bfd_elf32_bfd_link_hash_table_create elf_i386_link_hash_table_create
4828 #define bfd_elf32_bfd_link_hash_table_free elf_i386_link_hash_table_free
4829 #define bfd_elf32_bfd_reloc_type_lookup elf_i386_reloc_type_lookup
4830 #define bfd_elf32_bfd_reloc_name_lookup elf_i386_reloc_name_lookup
4832 #define elf_backend_adjust_dynamic_symbol elf_i386_adjust_dynamic_symbol
4833 #define elf_backend_relocs_compatible _bfd_elf_relocs_compatible
4834 #define elf_backend_check_relocs elf_i386_check_relocs
4835 #define elf_backend_copy_indirect_symbol elf_i386_copy_indirect_symbol
4836 #define elf_backend_create_dynamic_sections elf_i386_create_dynamic_sections
4837 #define elf_backend_fake_sections elf_i386_fake_sections
4838 #define elf_backend_finish_dynamic_sections elf_i386_finish_dynamic_sections
4839 #define elf_backend_finish_dynamic_symbol elf_i386_finish_dynamic_symbol
4840 #define elf_backend_gc_mark_hook elf_i386_gc_mark_hook
4841 #define elf_backend_gc_sweep_hook elf_i386_gc_sweep_hook
4842 #define elf_backend_grok_prstatus elf_i386_grok_prstatus
4843 #define elf_backend_grok_psinfo elf_i386_grok_psinfo
4844 #define elf_backend_reloc_type_class elf_i386_reloc_type_class
4845 #define elf_backend_relocate_section elf_i386_relocate_section
4846 #define elf_backend_size_dynamic_sections elf_i386_size_dynamic_sections
4847 #define elf_backend_always_size_sections elf_i386_always_size_sections
4848 #define elf_backend_omit_section_dynsym \
4849 ((bfd_boolean (*) (bfd *, struct bfd_link_info *, asection *)) bfd_true)
4850 #define elf_backend_plt_sym_val elf_i386_plt_sym_val
4851 #define elf_backend_hash_symbol elf_i386_hash_symbol
4852 #define elf_backend_add_symbol_hook elf_i386_add_symbol_hook
4853 #undef elf_backend_post_process_headers
4854 #define elf_backend_post_process_headers _bfd_elf_set_osabi
4856 #include "elf32-target.h"
4858 /* FreeBSD support. */
4860 #undef TARGET_LITTLE_SYM
4861 #define TARGET_LITTLE_SYM bfd_elf32_i386_freebsd_vec
4862 #undef TARGET_LITTLE_NAME
4863 #define TARGET_LITTLE_NAME "elf32-i386-freebsd"
4865 #define ELF_OSABI ELFOSABI_FREEBSD
4867 /* The kernel recognizes executables as valid only if they carry a
4868 "FreeBSD" label in the ELF header. So we put this label on all
4869 executables and (for simplicity) also all other object files. */
4872 elf_i386_fbsd_post_process_headers (bfd
*abfd
, struct bfd_link_info
*info
)
4874 _bfd_elf_set_osabi (abfd
, info
);
4876 #ifdef OLD_FREEBSD_ABI_LABEL
4877 /* The ABI label supported by FreeBSD <= 4.0 is quite nonstandard. */
4878 memcpy (&i_ehdrp
->e_ident
[EI_ABIVERSION
], "FreeBSD", 8);
4882 #undef elf_backend_post_process_headers
4883 #define elf_backend_post_process_headers elf_i386_fbsd_post_process_headers
4885 #define elf32_bed elf32_i386_fbsd_bed
4887 #undef elf_backend_add_symbol_hook
4889 #include "elf32-target.h"
4891 /* VxWorks support. */
4893 #undef TARGET_LITTLE_SYM
4894 #define TARGET_LITTLE_SYM bfd_elf32_i386_vxworks_vec
4895 #undef TARGET_LITTLE_NAME
4896 #define TARGET_LITTLE_NAME "elf32-i386-vxworks"
4899 /* Like elf_i386_link_hash_table_create but with tweaks for VxWorks. */
4901 static struct bfd_link_hash_table
*
4902 elf_i386_vxworks_link_hash_table_create (bfd
*abfd
)
4904 struct bfd_link_hash_table
*ret
;
4905 struct elf_i386_link_hash_table
*htab
;
4907 ret
= elf_i386_link_hash_table_create (abfd
);
4910 htab
= (struct elf_i386_link_hash_table
*) ret
;
4911 htab
->is_vxworks
= 1;
4912 htab
->plt0_pad_byte
= 0x90;
4919 #undef elf_backend_relocs_compatible
4920 #undef elf_backend_post_process_headers
4921 #undef bfd_elf32_bfd_link_hash_table_create
4922 #define bfd_elf32_bfd_link_hash_table_create \
4923 elf_i386_vxworks_link_hash_table_create
4924 #undef elf_backend_add_symbol_hook
4925 #define elf_backend_add_symbol_hook \
4926 elf_vxworks_add_symbol_hook
4927 #undef elf_backend_link_output_symbol_hook
4928 #define elf_backend_link_output_symbol_hook \
4929 elf_vxworks_link_output_symbol_hook
4930 #undef elf_backend_emit_relocs
4931 #define elf_backend_emit_relocs elf_vxworks_emit_relocs
4932 #undef elf_backend_final_write_processing
4933 #define elf_backend_final_write_processing \
4934 elf_vxworks_final_write_processing
4936 /* On VxWorks, we emit relocations against _PROCEDURE_LINKAGE_TABLE_, so
4938 #undef elf_backend_want_plt_sym
4939 #define elf_backend_want_plt_sym 1
4942 #define elf32_bed elf32_i386_vxworks_bed
4944 #include "elf32-target.h"