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2005-06-20 H.J. Lu <hongjiu.lu@intel.com>
[binutils-gdb.git] / bfd / elf64-s390.c
1 /* IBM S/390-specific support for 64-bit ELF
2 Copyright 2000, 2001, 2002, 2003, 2004, 2005
3 Free Software Foundation, Inc.
4 Contributed Martin Schwidefsky (schwidefsky@de.ibm.com).
5
6 This file is part of BFD, the Binary File Descriptor library.
7
8 This program is free software; you can redistribute it and/or modify
9 it under the terms of the GNU General Public License as published by
10 the Free Software Foundation; either version 2 of the License, or
11 (at your option) any later version.
12
13 This program is distributed in the hope that it will be useful,
14 but WITHOUT ANY WARRANTY; without even the implied warranty of
15 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
16 GNU General Public License for more details.
17
18 You should have received a copy of the GNU General Public License
19 along with this program; if not, write to the Free Software
20 Foundation, Inc., 51 Franklin Street - Fifth Floor, Boston, MA
21 02110-1301, USA. */
22
23 #include "bfd.h"
24 #include "sysdep.h"
25 #include "bfdlink.h"
26 #include "libbfd.h"
27 #include "elf-bfd.h"
28
29 static reloc_howto_type *elf_s390_reloc_type_lookup
30 PARAMS ((bfd *, bfd_reloc_code_real_type));
31 static void elf_s390_info_to_howto
32 PARAMS ((bfd *, arelent *, Elf_Internal_Rela *));
33 static bfd_boolean elf_s390_is_local_label_name
34 PARAMS ((bfd *, const char *));
35 static struct bfd_hash_entry *link_hash_newfunc
36 PARAMS ((struct bfd_hash_entry *, struct bfd_hash_table *, const char *));
37 static struct bfd_link_hash_table *elf_s390_link_hash_table_create
38 PARAMS ((bfd *));
39 static bfd_boolean create_got_section
40 PARAMS((bfd *, struct bfd_link_info *));
41 static bfd_boolean elf_s390_create_dynamic_sections
42 PARAMS((bfd *, struct bfd_link_info *));
43 static void elf_s390_copy_indirect_symbol
44 PARAMS ((const struct elf_backend_data *, struct elf_link_hash_entry *,
45 struct elf_link_hash_entry *));
46 static bfd_boolean elf_s390_check_relocs
47 PARAMS ((bfd *, struct bfd_link_info *, asection *,
48 const Elf_Internal_Rela *));
49 static asection *elf_s390_gc_mark_hook
50 PARAMS ((asection *, struct bfd_link_info *, Elf_Internal_Rela *,
51 struct elf_link_hash_entry *, Elf_Internal_Sym *));
52 static bfd_boolean elf_s390_gc_sweep_hook
53 PARAMS ((bfd *, struct bfd_link_info *, asection *,
54 const Elf_Internal_Rela *));
55 struct elf_s390_link_hash_entry;
56 static void elf_s390_adjust_gotplt
57 PARAMS ((struct elf_s390_link_hash_entry *));
58 static bfd_boolean elf_s390_adjust_dynamic_symbol
59 PARAMS ((struct bfd_link_info *, struct elf_link_hash_entry *));
60 static bfd_boolean allocate_dynrelocs
61 PARAMS ((struct elf_link_hash_entry *, PTR));
62 static bfd_boolean readonly_dynrelocs
63 PARAMS ((struct elf_link_hash_entry *, PTR));
64 static bfd_boolean elf_s390_size_dynamic_sections
65 PARAMS ((bfd *, struct bfd_link_info *));
66 static bfd_boolean elf_s390_relocate_section
67 PARAMS ((bfd *, struct bfd_link_info *, bfd *, asection *, bfd_byte *,
68 Elf_Internal_Rela *, Elf_Internal_Sym *, asection **));
69 static bfd_boolean elf_s390_finish_dynamic_symbol
70 PARAMS ((bfd *, struct bfd_link_info *, struct elf_link_hash_entry *,
71 Elf_Internal_Sym *));
72 static enum elf_reloc_type_class elf_s390_reloc_type_class
73 PARAMS ((const Elf_Internal_Rela *));
74 static bfd_boolean elf_s390_finish_dynamic_sections
75 PARAMS ((bfd *, struct bfd_link_info *));
76 static bfd_boolean elf_s390_mkobject
77 PARAMS ((bfd *));
78 static bfd_boolean elf_s390_object_p
79 PARAMS ((bfd *));
80 static int elf_s390_tls_transition
81 PARAMS ((struct bfd_link_info *, int, int));
82 static bfd_reloc_status_type s390_tls_reloc
83 PARAMS ((bfd *, arelent *, asymbol *, PTR, asection *, bfd *, char **));
84 static bfd_vma dtpoff_base
85 PARAMS ((struct bfd_link_info *));
86 static bfd_vma tpoff
87 PARAMS ((struct bfd_link_info *, bfd_vma));
88 static void invalid_tls_insn
89 PARAMS ((bfd *, asection *, Elf_Internal_Rela *));
90 static bfd_reloc_status_type s390_elf_ldisp_reloc
91 PARAMS ((bfd *, arelent *, asymbol *, PTR, asection *, bfd *, char **));
92
93 #include "elf/s390.h"
94
95 /* In case we're on a 32-bit machine, construct a 64-bit "-1" value
96 from smaller values. Start with zero, widen, *then* decrement. */
97 #define MINUS_ONE (((bfd_vma)0) - 1)
98
99 /* The relocation "howto" table. */
100 static reloc_howto_type elf_howto_table[] =
101 {
102 HOWTO (R_390_NONE, /* type */
103 0, /* rightshift */
104 0, /* size (0 = byte, 1 = short, 2 = long) */
105 0, /* bitsize */
106 FALSE, /* pc_relative */
107 0, /* bitpos */
108 complain_overflow_dont, /* complain_on_overflow */
109 bfd_elf_generic_reloc, /* special_function */
110 "R_390_NONE", /* name */
111 FALSE, /* partial_inplace */
112 0, /* src_mask */
113 0, /* dst_mask */
114 FALSE), /* pcrel_offset */
115
116 HOWTO(R_390_8, 0, 0, 8, FALSE, 0, complain_overflow_bitfield,
117 bfd_elf_generic_reloc, "R_390_8", FALSE, 0,0x000000ff, FALSE),
118 HOWTO(R_390_12, 0, 1, 12, FALSE, 0, complain_overflow_dont,
119 bfd_elf_generic_reloc, "R_390_12", FALSE, 0,0x00000fff, FALSE),
120 HOWTO(R_390_16, 0, 1, 16, FALSE, 0, complain_overflow_bitfield,
121 bfd_elf_generic_reloc, "R_390_16", FALSE, 0,0x0000ffff, FALSE),
122 HOWTO(R_390_32, 0, 2, 32, FALSE, 0, complain_overflow_bitfield,
123 bfd_elf_generic_reloc, "R_390_32", FALSE, 0,0xffffffff, FALSE),
124 HOWTO(R_390_PC32, 0, 2, 32, TRUE, 0, complain_overflow_bitfield,
125 bfd_elf_generic_reloc, "R_390_PC32", FALSE, 0,0xffffffff, TRUE),
126 HOWTO(R_390_GOT12, 0, 1, 12, FALSE, 0, complain_overflow_bitfield,
127 bfd_elf_generic_reloc, "R_390_GOT12", FALSE, 0,0x00000fff, FALSE),
128 HOWTO(R_390_GOT32, 0, 2, 32, FALSE, 0, complain_overflow_bitfield,
129 bfd_elf_generic_reloc, "R_390_GOT32", FALSE, 0,0xffffffff, FALSE),
130 HOWTO(R_390_PLT32, 0, 2, 32, TRUE, 0, complain_overflow_bitfield,
131 bfd_elf_generic_reloc, "R_390_PLT32", FALSE, 0,0xffffffff, TRUE),
132 HOWTO(R_390_COPY, 0, 4, 64, FALSE, 0, complain_overflow_bitfield,
133 bfd_elf_generic_reloc, "R_390_COPY", FALSE, 0,MINUS_ONE, FALSE),
134 HOWTO(R_390_GLOB_DAT, 0, 4, 64, FALSE, 0, complain_overflow_bitfield,
135 bfd_elf_generic_reloc, "R_390_GLOB_DAT", FALSE, 0,MINUS_ONE, FALSE),
136 HOWTO(R_390_JMP_SLOT, 0, 4, 64, FALSE, 0, complain_overflow_bitfield,
137 bfd_elf_generic_reloc, "R_390_JMP_SLOT", FALSE, 0,MINUS_ONE, FALSE),
138 HOWTO(R_390_RELATIVE, 0, 4, 64, TRUE, 0, complain_overflow_bitfield,
139 bfd_elf_generic_reloc, "R_390_RELATIVE", FALSE, 0,MINUS_ONE, FALSE),
140 HOWTO(R_390_GOTOFF32, 0, 2, 32, FALSE, 0, complain_overflow_bitfield,
141 bfd_elf_generic_reloc, "R_390_GOTOFF32", FALSE, 0,MINUS_ONE, FALSE),
142 HOWTO(R_390_GOTPC, 0, 4, 64, TRUE, 0, complain_overflow_bitfield,
143 bfd_elf_generic_reloc, "R_390_GOTPC", FALSE, 0,MINUS_ONE, TRUE),
144 HOWTO(R_390_GOT16, 0, 1, 16, FALSE, 0, complain_overflow_bitfield,
145 bfd_elf_generic_reloc, "R_390_GOT16", FALSE, 0,0x0000ffff, FALSE),
146 HOWTO(R_390_PC16, 0, 1, 16, TRUE, 0, complain_overflow_bitfield,
147 bfd_elf_generic_reloc, "R_390_PC16", FALSE, 0,0x0000ffff, TRUE),
148 HOWTO(R_390_PC16DBL, 1, 1, 16, TRUE, 0, complain_overflow_bitfield,
149 bfd_elf_generic_reloc, "R_390_PC16DBL", FALSE, 0,0x0000ffff, TRUE),
150 HOWTO(R_390_PLT16DBL, 1, 1, 16, TRUE, 0, complain_overflow_bitfield,
151 bfd_elf_generic_reloc, "R_390_PLT16DBL", FALSE, 0,0x0000ffff, TRUE),
152 HOWTO(R_390_PC32DBL, 1, 2, 32, TRUE, 0, complain_overflow_bitfield,
153 bfd_elf_generic_reloc, "R_390_PC32DBL", FALSE, 0,0xffffffff, TRUE),
154 HOWTO(R_390_PLT32DBL, 1, 2, 32, TRUE, 0, complain_overflow_bitfield,
155 bfd_elf_generic_reloc, "R_390_PLT32DBL", FALSE, 0,0xffffffff, TRUE),
156 HOWTO(R_390_GOTPCDBL, 1, 2, 32, TRUE, 0, complain_overflow_bitfield,
157 bfd_elf_generic_reloc, "R_390_GOTPCDBL", FALSE, 0,MINUS_ONE, TRUE),
158 HOWTO(R_390_64, 0, 4, 64, FALSE, 0, complain_overflow_bitfield,
159 bfd_elf_generic_reloc, "R_390_64", FALSE, 0,MINUS_ONE, FALSE),
160 HOWTO(R_390_PC64, 0, 4, 64, TRUE, 0, complain_overflow_bitfield,
161 bfd_elf_generic_reloc, "R_390_PC64", FALSE, 0,MINUS_ONE, TRUE),
162 HOWTO(R_390_GOT64, 0, 4, 64, FALSE, 0, complain_overflow_bitfield,
163 bfd_elf_generic_reloc, "R_390_GOT64", FALSE, 0,MINUS_ONE, FALSE),
164 HOWTO(R_390_PLT64, 0, 4, 64, TRUE, 0, complain_overflow_bitfield,
165 bfd_elf_generic_reloc, "R_390_PLT64", FALSE, 0,MINUS_ONE, TRUE),
166 HOWTO(R_390_GOTENT, 1, 2, 32, TRUE, 0, complain_overflow_bitfield,
167 bfd_elf_generic_reloc, "R_390_GOTENT", FALSE, 0,MINUS_ONE, TRUE),
168 HOWTO(R_390_GOTOFF16, 0, 1, 16, FALSE, 0, complain_overflow_bitfield,
169 bfd_elf_generic_reloc, "R_390_GOTOFF16", FALSE, 0,0x0000ffff, FALSE),
170 HOWTO(R_390_GOTOFF64, 0, 4, 64, FALSE, 0, complain_overflow_bitfield,
171 bfd_elf_generic_reloc, "R_390_GOTOFF64", FALSE, 0,MINUS_ONE, FALSE),
172 HOWTO(R_390_GOTPLT12, 0, 1, 12, FALSE, 0, complain_overflow_dont,
173 bfd_elf_generic_reloc, "R_390_GOTPLT12", FALSE, 0,0x00000fff, FALSE),
174 HOWTO(R_390_GOTPLT16, 0, 1, 16, FALSE, 0, complain_overflow_bitfield,
175 bfd_elf_generic_reloc, "R_390_GOTPLT16", FALSE, 0,0x0000ffff, FALSE),
176 HOWTO(R_390_GOTPLT32, 0, 2, 32, FALSE, 0, complain_overflow_bitfield,
177 bfd_elf_generic_reloc, "R_390_GOTPLT32", FALSE, 0,0xffffffff, FALSE),
178 HOWTO(R_390_GOTPLT64, 0, 4, 64, FALSE, 0, complain_overflow_bitfield,
179 bfd_elf_generic_reloc, "R_390_GOTPLT64", FALSE, 0,MINUS_ONE, FALSE),
180 HOWTO(R_390_GOTPLTENT, 1, 2, 32, TRUE, 0, complain_overflow_bitfield,
181 bfd_elf_generic_reloc, "R_390_GOTPLTENT",FALSE, 0,MINUS_ONE, TRUE),
182 HOWTO(R_390_PLTOFF16, 0, 1, 16, FALSE, 0, complain_overflow_bitfield,
183 bfd_elf_generic_reloc, "R_390_PLTOFF16", FALSE, 0,0x0000ffff, FALSE),
184 HOWTO(R_390_PLTOFF32, 0, 2, 32, FALSE, 0, complain_overflow_bitfield,
185 bfd_elf_generic_reloc, "R_390_PLTOFF32", FALSE, 0,0xffffffff, FALSE),
186 HOWTO(R_390_PLTOFF64, 0, 4, 64, FALSE, 0, complain_overflow_bitfield,
187 bfd_elf_generic_reloc, "R_390_PLTOFF64", FALSE, 0,MINUS_ONE, FALSE),
188 HOWTO(R_390_TLS_LOAD, 0, 0, 0, FALSE, 0, complain_overflow_dont,
189 s390_tls_reloc, "R_390_TLS_LOAD", FALSE, 0, 0, FALSE),
190 HOWTO(R_390_TLS_GDCALL, 0, 0, 0, FALSE, 0, complain_overflow_dont,
191 s390_tls_reloc, "R_390_TLS_GDCALL", FALSE, 0, 0, FALSE),
192 HOWTO(R_390_TLS_LDCALL, 0, 0, 0, FALSE, 0, complain_overflow_dont,
193 s390_tls_reloc, "R_390_TLS_LDCALL", FALSE, 0, 0, FALSE),
194 EMPTY_HOWTO (R_390_TLS_GD32), /* Empty entry for R_390_TLS_GD32. */
195 HOWTO(R_390_TLS_GD64, 0, 4, 64, FALSE, 0, complain_overflow_bitfield,
196 bfd_elf_generic_reloc, "R_390_TLS_GD64", FALSE, 0, MINUS_ONE, FALSE),
197 HOWTO(R_390_TLS_GOTIE12, 0, 1, 12, FALSE, 0, complain_overflow_dont,
198 bfd_elf_generic_reloc, "R_390_TLS_GOTIE12", FALSE, 0, 0x00000fff, FALSE),
199 EMPTY_HOWTO (R_390_TLS_GOTIE32), /* Empty entry for R_390_TLS_GOTIE32. */
200 HOWTO(R_390_TLS_GOTIE64, 0, 4, 64, FALSE, 0, complain_overflow_bitfield,
201 bfd_elf_generic_reloc, "R_390_TLS_GOTIE64", FALSE, 0, MINUS_ONE, FALSE),
202 EMPTY_HOWTO (R_390_TLS_LDM32), /* Empty entry for R_390_TLS_LDM32. */
203 HOWTO(R_390_TLS_LDM64, 0, 4, 64, FALSE, 0, complain_overflow_bitfield,
204 bfd_elf_generic_reloc, "R_390_TLS_LDM64", FALSE, 0, MINUS_ONE, FALSE),
205 EMPTY_HOWTO (R_390_TLS_IE32), /* Empty entry for R_390_TLS_IE32. */
206 HOWTO(R_390_TLS_IE64, 0, 4, 64, FALSE, 0, complain_overflow_bitfield,
207 bfd_elf_generic_reloc, "R_390_TLS_IE64", FALSE, 0, MINUS_ONE, FALSE),
208 HOWTO(R_390_TLS_IEENT, 1, 2, 32, TRUE, 0, complain_overflow_bitfield,
209 bfd_elf_generic_reloc, "R_390_TLS_IEENT", FALSE, 0, MINUS_ONE, TRUE),
210 EMPTY_HOWTO (R_390_TLS_LE32), /* Empty entry for R_390_TLS_LE32. */
211 HOWTO(R_390_TLS_LE64, 0, 2, 32, FALSE, 0, complain_overflow_bitfield,
212 bfd_elf_generic_reloc, "R_390_TLS_LE64", FALSE, 0, MINUS_ONE, FALSE),
213 EMPTY_HOWTO (R_390_TLS_LDO32), /* Empty entry for R_390_TLS_LDO32. */
214 HOWTO(R_390_TLS_LDO64, 0, 4, 64, FALSE, 0, complain_overflow_bitfield,
215 bfd_elf_generic_reloc, "R_390_TLS_LDO64", FALSE, 0, MINUS_ONE, FALSE),
216 HOWTO(R_390_TLS_DTPMOD, 0, 4, 64, FALSE, 0, complain_overflow_bitfield,
217 bfd_elf_generic_reloc, "R_390_TLS_DTPMOD", FALSE, 0, MINUS_ONE, FALSE),
218 HOWTO(R_390_TLS_DTPOFF, 0, 4, 64, FALSE, 0, complain_overflow_bitfield,
219 bfd_elf_generic_reloc, "R_390_TLS_DTPOFF", FALSE, 0, MINUS_ONE, FALSE),
220 HOWTO(R_390_TLS_TPOFF, 0, 4, 64, FALSE, 0, complain_overflow_bitfield,
221 bfd_elf_generic_reloc, "R_390_TLS_TPOFF", FALSE, 0, MINUS_ONE, FALSE),
222 HOWTO(R_390_20, 0, 2, 20, FALSE, 8, complain_overflow_dont,
223 s390_elf_ldisp_reloc, "R_390_20", FALSE, 0,0x0fffff00, FALSE),
224 HOWTO(R_390_GOT20, 0, 2, 20, FALSE, 8, complain_overflow_dont,
225 s390_elf_ldisp_reloc, "R_390_GOT20", FALSE, 0,0x0fffff00, FALSE),
226 HOWTO(R_390_GOTPLT20, 0, 2, 20, FALSE, 8, complain_overflow_dont,
227 s390_elf_ldisp_reloc, "R_390_GOTPLT20", FALSE, 0,0x0fffff00, FALSE),
228 HOWTO(R_390_TLS_GOTIE20, 0, 2, 20, FALSE, 8, complain_overflow_dont,
229 s390_elf_ldisp_reloc, "R_390_TLS_GOTIE20", FALSE, 0,0x0fffff00, FALSE),
230 };
231
232 /* GNU extension to record C++ vtable hierarchy. */
233 static reloc_howto_type elf64_s390_vtinherit_howto =
234 HOWTO (R_390_GNU_VTINHERIT, 0,4,0,FALSE,0,complain_overflow_dont, NULL, "R_390_GNU_VTINHERIT", FALSE,0, 0, FALSE);
235 static reloc_howto_type elf64_s390_vtentry_howto =
236 HOWTO (R_390_GNU_VTENTRY, 0,4,0,FALSE,0,complain_overflow_dont, _bfd_elf_rel_vtable_reloc_fn,"R_390_GNU_VTENTRY", FALSE,0,0, FALSE);
237
238 static reloc_howto_type *
239 elf_s390_reloc_type_lookup (abfd, code)
240 bfd *abfd ATTRIBUTE_UNUSED;
241 bfd_reloc_code_real_type code;
242 {
243 switch (code)
244 {
245 case BFD_RELOC_NONE:
246 return &elf_howto_table[(int) R_390_NONE];
247 case BFD_RELOC_8:
248 return &elf_howto_table[(int) R_390_8];
249 case BFD_RELOC_390_12:
250 return &elf_howto_table[(int) R_390_12];
251 case BFD_RELOC_16:
252 return &elf_howto_table[(int) R_390_16];
253 case BFD_RELOC_32:
254 return &elf_howto_table[(int) R_390_32];
255 case BFD_RELOC_CTOR:
256 return &elf_howto_table[(int) R_390_32];
257 case BFD_RELOC_32_PCREL:
258 return &elf_howto_table[(int) R_390_PC32];
259 case BFD_RELOC_390_GOT12:
260 return &elf_howto_table[(int) R_390_GOT12];
261 case BFD_RELOC_32_GOT_PCREL:
262 return &elf_howto_table[(int) R_390_GOT32];
263 case BFD_RELOC_390_PLT32:
264 return &elf_howto_table[(int) R_390_PLT32];
265 case BFD_RELOC_390_COPY:
266 return &elf_howto_table[(int) R_390_COPY];
267 case BFD_RELOC_390_GLOB_DAT:
268 return &elf_howto_table[(int) R_390_GLOB_DAT];
269 case BFD_RELOC_390_JMP_SLOT:
270 return &elf_howto_table[(int) R_390_JMP_SLOT];
271 case BFD_RELOC_390_RELATIVE:
272 return &elf_howto_table[(int) R_390_RELATIVE];
273 case BFD_RELOC_32_GOTOFF:
274 return &elf_howto_table[(int) R_390_GOTOFF32];
275 case BFD_RELOC_390_GOTPC:
276 return &elf_howto_table[(int) R_390_GOTPC];
277 case BFD_RELOC_390_GOT16:
278 return &elf_howto_table[(int) R_390_GOT16];
279 case BFD_RELOC_16_PCREL:
280 return &elf_howto_table[(int) R_390_PC16];
281 case BFD_RELOC_390_PC16DBL:
282 return &elf_howto_table[(int) R_390_PC16DBL];
283 case BFD_RELOC_390_PLT16DBL:
284 return &elf_howto_table[(int) R_390_PLT16DBL];
285 case BFD_RELOC_390_PC32DBL:
286 return &elf_howto_table[(int) R_390_PC32DBL];
287 case BFD_RELOC_390_PLT32DBL:
288 return &elf_howto_table[(int) R_390_PLT32DBL];
289 case BFD_RELOC_390_GOTPCDBL:
290 return &elf_howto_table[(int) R_390_GOTPCDBL];
291 case BFD_RELOC_64:
292 return &elf_howto_table[(int) R_390_64];
293 case BFD_RELOC_64_PCREL:
294 return &elf_howto_table[(int) R_390_PC64];
295 case BFD_RELOC_390_GOT64:
296 return &elf_howto_table[(int) R_390_GOT64];
297 case BFD_RELOC_390_PLT64:
298 return &elf_howto_table[(int) R_390_PLT64];
299 case BFD_RELOC_390_GOTENT:
300 return &elf_howto_table[(int) R_390_GOTENT];
301 case BFD_RELOC_16_GOTOFF:
302 return &elf_howto_table[(int) R_390_GOTOFF16];
303 case BFD_RELOC_390_GOTOFF64:
304 return &elf_howto_table[(int) R_390_GOTOFF64];
305 case BFD_RELOC_390_GOTPLT12:
306 return &elf_howto_table[(int) R_390_GOTPLT12];
307 case BFD_RELOC_390_GOTPLT16:
308 return &elf_howto_table[(int) R_390_GOTPLT16];
309 case BFD_RELOC_390_GOTPLT32:
310 return &elf_howto_table[(int) R_390_GOTPLT32];
311 case BFD_RELOC_390_GOTPLT64:
312 return &elf_howto_table[(int) R_390_GOTPLT64];
313 case BFD_RELOC_390_GOTPLTENT:
314 return &elf_howto_table[(int) R_390_GOTPLTENT];
315 case BFD_RELOC_390_PLTOFF16:
316 return &elf_howto_table[(int) R_390_PLTOFF16];
317 case BFD_RELOC_390_PLTOFF32:
318 return &elf_howto_table[(int) R_390_PLTOFF32];
319 case BFD_RELOC_390_PLTOFF64:
320 return &elf_howto_table[(int) R_390_PLTOFF64];
321 case BFD_RELOC_390_TLS_LOAD:
322 return &elf_howto_table[(int) R_390_TLS_LOAD];
323 case BFD_RELOC_390_TLS_GDCALL:
324 return &elf_howto_table[(int) R_390_TLS_GDCALL];
325 case BFD_RELOC_390_TLS_LDCALL:
326 return &elf_howto_table[(int) R_390_TLS_LDCALL];
327 case BFD_RELOC_390_TLS_GD64:
328 return &elf_howto_table[(int) R_390_TLS_GD64];
329 case BFD_RELOC_390_TLS_GOTIE12:
330 return &elf_howto_table[(int) R_390_TLS_GOTIE12];
331 case BFD_RELOC_390_TLS_GOTIE64:
332 return &elf_howto_table[(int) R_390_TLS_GOTIE64];
333 case BFD_RELOC_390_TLS_LDM64:
334 return &elf_howto_table[(int) R_390_TLS_LDM64];
335 case BFD_RELOC_390_TLS_IE64:
336 return &elf_howto_table[(int) R_390_TLS_IE64];
337 case BFD_RELOC_390_TLS_IEENT:
338 return &elf_howto_table[(int) R_390_TLS_IEENT];
339 case BFD_RELOC_390_TLS_LE64:
340 return &elf_howto_table[(int) R_390_TLS_LE64];
341 case BFD_RELOC_390_TLS_LDO64:
342 return &elf_howto_table[(int) R_390_TLS_LDO64];
343 case BFD_RELOC_390_TLS_DTPMOD:
344 return &elf_howto_table[(int) R_390_TLS_DTPMOD];
345 case BFD_RELOC_390_TLS_DTPOFF:
346 return &elf_howto_table[(int) R_390_TLS_DTPOFF];
347 case BFD_RELOC_390_TLS_TPOFF:
348 return &elf_howto_table[(int) R_390_TLS_TPOFF];
349 case BFD_RELOC_390_20:
350 return &elf_howto_table[(int) R_390_20];
351 case BFD_RELOC_390_GOT20:
352 return &elf_howto_table[(int) R_390_GOT20];
353 case BFD_RELOC_390_GOTPLT20:
354 return &elf_howto_table[(int) R_390_GOTPLT20];
355 case BFD_RELOC_390_TLS_GOTIE20:
356 return &elf_howto_table[(int) R_390_TLS_GOTIE20];
357 case BFD_RELOC_VTABLE_INHERIT:
358 return &elf64_s390_vtinherit_howto;
359 case BFD_RELOC_VTABLE_ENTRY:
360 return &elf64_s390_vtentry_howto;
361 default:
362 break;
363 }
364 return 0;
365 }
366
367 /* We need to use ELF64_R_TYPE so we have our own copy of this function,
368 and elf64-s390.c has its own copy. */
369
370 static void
371 elf_s390_info_to_howto (abfd, cache_ptr, dst)
372 bfd *abfd ATTRIBUTE_UNUSED;
373 arelent *cache_ptr;
374 Elf_Internal_Rela *dst;
375 {
376 switch (ELF64_R_TYPE(dst->r_info))
377 {
378 case R_390_GNU_VTINHERIT:
379 cache_ptr->howto = &elf64_s390_vtinherit_howto;
380 break;
381
382 case R_390_GNU_VTENTRY:
383 cache_ptr->howto = &elf64_s390_vtentry_howto;
384 break;
385
386 default:
387 BFD_ASSERT (ELF64_R_TYPE(dst->r_info) < (unsigned int) R_390_max);
388 cache_ptr->howto = &elf_howto_table[ELF64_R_TYPE(dst->r_info)];
389 }
390 }
391
392 /* A relocation function which doesn't do anything. */
393 static bfd_reloc_status_type
394 s390_tls_reloc (abfd, reloc_entry, symbol, data, input_section,
395 output_bfd, error_message)
396 bfd *abfd ATTRIBUTE_UNUSED;
397 arelent *reloc_entry;
398 asymbol *symbol ATTRIBUTE_UNUSED;
399 PTR data ATTRIBUTE_UNUSED;
400 asection *input_section;
401 bfd *output_bfd;
402 char **error_message ATTRIBUTE_UNUSED;
403 {
404 if (output_bfd)
405 reloc_entry->address += input_section->output_offset;
406 return bfd_reloc_ok;
407 }
408
409 /* Handle the large displacement relocs. */
410 static bfd_reloc_status_type
411 s390_elf_ldisp_reloc (abfd, reloc_entry, symbol, data, input_section,
412 output_bfd, error_message)
413 bfd *abfd;
414 arelent *reloc_entry;
415 asymbol *symbol;
416 PTR data;
417 asection *input_section;
418 bfd *output_bfd;
419 char **error_message ATTRIBUTE_UNUSED;
420 {
421 reloc_howto_type *howto = reloc_entry->howto;
422 bfd_vma relocation;
423 bfd_vma insn;
424
425 if (output_bfd != (bfd *) NULL
426 && (symbol->flags & BSF_SECTION_SYM) == 0
427 && (! howto->partial_inplace
428 || reloc_entry->addend == 0))
429 {
430 reloc_entry->address += input_section->output_offset;
431 return bfd_reloc_ok;
432 }
433 if (output_bfd != NULL)
434 return bfd_reloc_continue;
435
436 if (reloc_entry->address > bfd_get_section_limit (abfd, input_section))
437 return bfd_reloc_outofrange;
438
439 relocation = (symbol->value
440 + symbol->section->output_section->vma
441 + symbol->section->output_offset);
442 relocation += reloc_entry->addend;
443 if (howto->pc_relative)
444 {
445 relocation -= (input_section->output_section->vma
446 + input_section->output_offset);
447 relocation -= reloc_entry->address;
448 }
449
450 insn = bfd_get_32 (abfd, (bfd_byte *) data + reloc_entry->address);
451 insn |= (relocation & 0xfff) << 16 | (relocation & 0xff000) >> 4;
452 bfd_put_32 (abfd, insn, (bfd_byte *) data + reloc_entry->address);
453
454 if ((bfd_signed_vma) relocation < - 0x80000
455 || (bfd_signed_vma) relocation > 0x7ffff)
456 return bfd_reloc_overflow;
457 else
458 return bfd_reloc_ok;
459 }
460
461 static bfd_boolean
462 elf_s390_is_local_label_name (abfd, name)
463 bfd *abfd;
464 const char *name;
465 {
466 if (name[0] == '.' && (name[1] == 'X' || name[1] == 'L'))
467 return TRUE;
468
469 return _bfd_elf_is_local_label_name (abfd, name);
470 }
471
472 /* Functions for the 390 ELF linker. */
473
474 /* The name of the dynamic interpreter. This is put in the .interp
475 section. */
476
477 #define ELF_DYNAMIC_INTERPRETER "/usr/lib/ld.so.1"
478
479 /* If ELIMINATE_COPY_RELOCS is non-zero, the linker will try to avoid
480 copying dynamic variables from a shared lib into an app's dynbss
481 section, and instead use a dynamic relocation to point into the
482 shared lib. */
483 #define ELIMINATE_COPY_RELOCS 1
484
485 /* The size in bytes of the first entry in the procedure linkage table. */
486 #define PLT_FIRST_ENTRY_SIZE 32
487 /* The size in bytes of an entry in the procedure linkage table. */
488 #define PLT_ENTRY_SIZE 32
489
490 #define GOT_ENTRY_SIZE 8
491
492 /* The first three entries in a procedure linkage table are reserved,
493 and the initial contents are unimportant (we zero them out).
494 Subsequent entries look like this. See the SVR4 ABI 386
495 supplement to see how this works. */
496
497 /* For the s390, simple addr offset can only be 0 - 4096.
498 To use the full 16777216 TB address space, several instructions
499 are needed to load an address in a register and execute
500 a branch( or just saving the address)
501
502 Furthermore, only r 0 and 1 are free to use!!! */
503
504 /* The first 3 words in the GOT are then reserved.
505 Word 0 is the address of the dynamic table.
506 Word 1 is a pointer to a structure describing the object
507 Word 2 is used to point to the loader entry address.
508
509 The code for PLT entries looks like this:
510
511 The GOT holds the address in the PLT to be executed.
512 The loader then gets:
513 24(15) = Pointer to the structure describing the object.
514 28(15) = Offset in symbol table
515 The loader must then find the module where the function is
516 and insert the address in the GOT.
517
518 PLT1: LARL 1,<fn>@GOTENT # 6 bytes Load address of GOT entry in r1
519 LG 1,0(1) # 6 bytes Load address from GOT in r1
520 BCR 15,1 # 2 bytes Jump to address
521 RET1: BASR 1,0 # 2 bytes Return from GOT 1st time
522 LGF 1,12(1) # 6 bytes Load offset in symbl table in r1
523 BRCL 15,-x # 6 bytes Jump to start of PLT
524 .long ? # 4 bytes offset into symbol table
525
526 Total = 32 bytes per PLT entry
527 Fixup at offset 2: relative address to GOT entry
528 Fixup at offset 22: relative branch to PLT0
529 Fixup at offset 28: 32 bit offset into symbol table
530
531 A 32 bit offset into the symbol table is enough. It allows for symbol
532 tables up to a size of 2 gigabyte. A single dynamic object (the main
533 program, any shared library) is limited to 4GB in size and I want to see
534 the program that manages to have a symbol table of more than 2 GB with a
535 total size of at max 4 GB. */
536
537 #define PLT_ENTRY_WORD0 (bfd_vma) 0xc0100000
538 #define PLT_ENTRY_WORD1 (bfd_vma) 0x0000e310
539 #define PLT_ENTRY_WORD2 (bfd_vma) 0x10000004
540 #define PLT_ENTRY_WORD3 (bfd_vma) 0x07f10d10
541 #define PLT_ENTRY_WORD4 (bfd_vma) 0xe310100c
542 #define PLT_ENTRY_WORD5 (bfd_vma) 0x0014c0f4
543 #define PLT_ENTRY_WORD6 (bfd_vma) 0x00000000
544 #define PLT_ENTRY_WORD7 (bfd_vma) 0x00000000
545
546 /* The first PLT entry pushes the offset into the symbol table
547 from R1 onto the stack at 8(15) and the loader object info
548 at 12(15), loads the loader address in R1 and jumps to it. */
549
550 /* The first entry in the PLT:
551
552 PLT0:
553 STG 1,56(15) # r1 contains the offset into the symbol table
554 LARL 1,_GLOBAL_OFFSET_TABLE # load address of global offset table
555 MVC 48(8,15),8(1) # move loader ino (object struct address) to stack
556 LG 1,16(1) # get entry address of loader
557 BCR 15,1 # jump to loader
558
559 Fixup at offset 8: relative address to start of GOT. */
560
561 #define PLT_FIRST_ENTRY_WORD0 (bfd_vma) 0xe310f038
562 #define PLT_FIRST_ENTRY_WORD1 (bfd_vma) 0x0024c010
563 #define PLT_FIRST_ENTRY_WORD2 (bfd_vma) 0x00000000
564 #define PLT_FIRST_ENTRY_WORD3 (bfd_vma) 0xd207f030
565 #define PLT_FIRST_ENTRY_WORD4 (bfd_vma) 0x1008e310
566 #define PLT_FIRST_ENTRY_WORD5 (bfd_vma) 0x10100004
567 #define PLT_FIRST_ENTRY_WORD6 (bfd_vma) 0x07f10700
568 #define PLT_FIRST_ENTRY_WORD7 (bfd_vma) 0x07000700
569
570 /* The s390 linker needs to keep track of the number of relocs that it
571 decides to copy as dynamic relocs in check_relocs for each symbol.
572 This is so that it can later discard them if they are found to be
573 unnecessary. We store the information in a field extending the
574 regular ELF linker hash table. */
575
576 struct elf_s390_dyn_relocs
577 {
578 struct elf_s390_dyn_relocs *next;
579
580 /* The input section of the reloc. */
581 asection *sec;
582
583 /* Total number of relocs copied for the input section. */
584 bfd_size_type count;
585
586 /* Number of pc-relative relocs copied for the input section. */
587 bfd_size_type pc_count;
588 };
589
590 /* s390 ELF linker hash entry. */
591
592 struct elf_s390_link_hash_entry
593 {
594 struct elf_link_hash_entry elf;
595
596 /* Track dynamic relocs copied for this symbol. */
597 struct elf_s390_dyn_relocs *dyn_relocs;
598
599 /* Number of GOTPLT references for a function. */
600 bfd_signed_vma gotplt_refcount;
601
602 #define GOT_UNKNOWN 0
603 #define GOT_NORMAL 1
604 #define GOT_TLS_GD 2
605 #define GOT_TLS_IE 3
606 #define GOT_TLS_IE_NLT 3
607 unsigned char tls_type;
608 };
609
610 #define elf_s390_hash_entry(ent) \
611 ((struct elf_s390_link_hash_entry *)(ent))
612
613 struct elf_s390_obj_tdata
614 {
615 struct elf_obj_tdata root;
616
617 /* tls_type for each local got entry. */
618 char *local_got_tls_type;
619 };
620
621 #define elf_s390_tdata(abfd) \
622 ((struct elf_s390_obj_tdata *) (abfd)->tdata.any)
623
624 #define elf_s390_local_got_tls_type(abfd) \
625 (elf_s390_tdata (abfd)->local_got_tls_type)
626
627 static bfd_boolean
628 elf_s390_mkobject (abfd)
629 bfd *abfd;
630 {
631 bfd_size_type amt = sizeof (struct elf_s390_obj_tdata);
632 abfd->tdata.any = bfd_zalloc (abfd, amt);
633 if (abfd->tdata.any == NULL)
634 return FALSE;
635 return TRUE;
636 }
637
638 static bfd_boolean
639 elf_s390_object_p (abfd)
640 bfd *abfd;
641 {
642 /* Set the right machine number for an s390 elf32 file. */
643 return bfd_default_set_arch_mach (abfd, bfd_arch_s390, bfd_mach_s390_64);
644 }
645
646 /* s390 ELF linker hash table. */
647
648 struct elf_s390_link_hash_table
649 {
650 struct elf_link_hash_table elf;
651
652 /* Short-cuts to get to dynamic linker sections. */
653 asection *sgot;
654 asection *sgotplt;
655 asection *srelgot;
656 asection *splt;
657 asection *srelplt;
658 asection *sdynbss;
659 asection *srelbss;
660
661 union {
662 bfd_signed_vma refcount;
663 bfd_vma offset;
664 } tls_ldm_got;
665
666 /* Small local sym to section mapping cache. */
667 struct sym_sec_cache sym_sec;
668 };
669
670 /* Get the s390 ELF linker hash table from a link_info structure. */
671
672 #define elf_s390_hash_table(p) \
673 ((struct elf_s390_link_hash_table *) ((p)->hash))
674
675 /* Create an entry in an s390 ELF linker hash table. */
676
677 static struct bfd_hash_entry *
678 link_hash_newfunc (entry, table, string)
679 struct bfd_hash_entry *entry;
680 struct bfd_hash_table *table;
681 const char *string;
682 {
683 /* Allocate the structure if it has not already been allocated by a
684 subclass. */
685 if (entry == NULL)
686 {
687 entry = bfd_hash_allocate (table,
688 sizeof (struct elf_s390_link_hash_entry));
689 if (entry == NULL)
690 return entry;
691 }
692
693 /* Call the allocation method of the superclass. */
694 entry = _bfd_elf_link_hash_newfunc (entry, table, string);
695 if (entry != NULL)
696 {
697 struct elf_s390_link_hash_entry *eh;
698
699 eh = (struct elf_s390_link_hash_entry *) entry;
700 eh->dyn_relocs = NULL;
701 eh->gotplt_refcount = 0;
702 eh->tls_type = GOT_UNKNOWN;
703 }
704
705 return entry;
706 }
707
708 /* Create an s390 ELF linker hash table. */
709
710 static struct bfd_link_hash_table *
711 elf_s390_link_hash_table_create (abfd)
712 bfd *abfd;
713 {
714 struct elf_s390_link_hash_table *ret;
715 bfd_size_type amt = sizeof (struct elf_s390_link_hash_table);
716
717 ret = (struct elf_s390_link_hash_table *) bfd_malloc (amt);
718 if (ret == NULL)
719 return NULL;
720
721 if (! _bfd_elf_link_hash_table_init (&ret->elf, abfd, link_hash_newfunc))
722 {
723 free (ret);
724 return NULL;
725 }
726
727 ret->sgot = NULL;
728 ret->sgotplt = NULL;
729 ret->srelgot = NULL;
730 ret->splt = NULL;
731 ret->srelplt = NULL;
732 ret->sdynbss = NULL;
733 ret->srelbss = NULL;
734 ret->tls_ldm_got.refcount = 0;
735 ret->sym_sec.abfd = NULL;
736
737 return &ret->elf.root;
738 }
739
740 /* Create .got, .gotplt, and .rela.got sections in DYNOBJ, and set up
741 shortcuts to them in our hash table. */
742
743 static bfd_boolean
744 create_got_section (dynobj, info)
745 bfd *dynobj;
746 struct bfd_link_info *info;
747 {
748 struct elf_s390_link_hash_table *htab;
749
750 if (! _bfd_elf_create_got_section (dynobj, info))
751 return FALSE;
752
753 htab = elf_s390_hash_table (info);
754 htab->sgot = bfd_get_section_by_name (dynobj, ".got");
755 htab->sgotplt = bfd_get_section_by_name (dynobj, ".got.plt");
756 if (!htab->sgot || !htab->sgotplt)
757 abort ();
758
759 htab->srelgot = bfd_make_section_with_flags (dynobj, ".rela.got",
760 (SEC_ALLOC | SEC_LOAD
761 | SEC_HAS_CONTENTS
762 | SEC_IN_MEMORY
763 | SEC_LINKER_CREATED
764 | SEC_READONLY));
765 if (htab->srelgot == NULL
766 || ! bfd_set_section_alignment (dynobj, htab->srelgot, 3))
767 return FALSE;
768 return TRUE;
769 }
770
771 /* Create .plt, .rela.plt, .got, .got.plt, .rela.got, .dynbss, and
772 .rela.bss sections in DYNOBJ, and set up shortcuts to them in our
773 hash table. */
774
775 static bfd_boolean
776 elf_s390_create_dynamic_sections (dynobj, info)
777 bfd *dynobj;
778 struct bfd_link_info *info;
779 {
780 struct elf_s390_link_hash_table *htab;
781
782 htab = elf_s390_hash_table (info);
783 if (!htab->sgot && !create_got_section (dynobj, info))
784 return FALSE;
785
786 if (!_bfd_elf_create_dynamic_sections (dynobj, info))
787 return FALSE;
788
789 htab->splt = bfd_get_section_by_name (dynobj, ".plt");
790 htab->srelplt = bfd_get_section_by_name (dynobj, ".rela.plt");
791 htab->sdynbss = bfd_get_section_by_name (dynobj, ".dynbss");
792 if (!info->shared)
793 htab->srelbss = bfd_get_section_by_name (dynobj, ".rela.bss");
794
795 if (!htab->splt || !htab->srelplt || !htab->sdynbss
796 || (!info->shared && !htab->srelbss))
797 abort ();
798
799 return TRUE;
800 }
801
802 /* Copy the extra info we tack onto an elf_link_hash_entry. */
803
804 static void
805 elf_s390_copy_indirect_symbol (bed, dir, ind)
806 const struct elf_backend_data *bed;
807 struct elf_link_hash_entry *dir, *ind;
808 {
809 struct elf_s390_link_hash_entry *edir, *eind;
810
811 edir = (struct elf_s390_link_hash_entry *) dir;
812 eind = (struct elf_s390_link_hash_entry *) ind;
813
814 if (eind->dyn_relocs != NULL)
815 {
816 if (edir->dyn_relocs != NULL)
817 {
818 struct elf_s390_dyn_relocs **pp;
819 struct elf_s390_dyn_relocs *p;
820
821 if (ind->root.type == bfd_link_hash_indirect)
822 abort ();
823
824 /* Add reloc counts against the weak sym to the strong sym
825 list. Merge any entries against the same section. */
826 for (pp = &eind->dyn_relocs; (p = *pp) != NULL; )
827 {
828 struct elf_s390_dyn_relocs *q;
829
830 for (q = edir->dyn_relocs; q != NULL; q = q->next)
831 if (q->sec == p->sec)
832 {
833 q->pc_count += p->pc_count;
834 q->count += p->count;
835 *pp = p->next;
836 break;
837 }
838 if (q == NULL)
839 pp = &p->next;
840 }
841 *pp = edir->dyn_relocs;
842 }
843
844 edir->dyn_relocs = eind->dyn_relocs;
845 eind->dyn_relocs = NULL;
846 }
847
848 if (ind->root.type == bfd_link_hash_indirect
849 && dir->got.refcount <= 0)
850 {
851 edir->tls_type = eind->tls_type;
852 eind->tls_type = GOT_UNKNOWN;
853 }
854
855 if (ELIMINATE_COPY_RELOCS
856 && ind->root.type != bfd_link_hash_indirect
857 && dir->dynamic_adjusted)
858 {
859 /* If called to transfer flags for a weakdef during processing
860 of elf_adjust_dynamic_symbol, don't copy non_got_ref.
861 We clear it ourselves for ELIMINATE_COPY_RELOCS. */
862 dir->ref_dynamic |= ind->ref_dynamic;
863 dir->ref_regular |= ind->ref_regular;
864 dir->ref_regular_nonweak |= ind->ref_regular_nonweak;
865 dir->needs_plt |= ind->needs_plt;
866 }
867 else
868 _bfd_elf_link_hash_copy_indirect (bed, dir, ind);
869 }
870
871 static int
872 elf_s390_tls_transition (info, r_type, is_local)
873 struct bfd_link_info *info;
874 int r_type;
875 int is_local;
876 {
877 if (info->shared)
878 return r_type;
879
880 switch (r_type)
881 {
882 case R_390_TLS_GD64:
883 case R_390_TLS_IE64:
884 if (is_local)
885 return R_390_TLS_LE64;
886 return R_390_TLS_IE64;
887 case R_390_TLS_GOTIE64:
888 if (is_local)
889 return R_390_TLS_LE64;
890 return R_390_TLS_GOTIE64;
891 case R_390_TLS_LDM64:
892 return R_390_TLS_LE64;
893 }
894
895 return r_type;
896 }
897
898 /* Look through the relocs for a section during the first phase, and
899 allocate space in the global offset table or procedure linkage
900 table. */
901
902 static bfd_boolean
903 elf_s390_check_relocs (abfd, info, sec, relocs)
904 bfd *abfd;
905 struct bfd_link_info *info;
906 asection *sec;
907 const Elf_Internal_Rela *relocs;
908 {
909 struct elf_s390_link_hash_table *htab;
910 Elf_Internal_Shdr *symtab_hdr;
911 struct elf_link_hash_entry **sym_hashes;
912 const Elf_Internal_Rela *rel;
913 const Elf_Internal_Rela *rel_end;
914 asection *sreloc;
915 bfd_signed_vma *local_got_refcounts;
916 int tls_type, old_tls_type;
917
918 if (info->relocatable)
919 return TRUE;
920
921 htab = elf_s390_hash_table (info);
922 symtab_hdr = &elf_tdata (abfd)->symtab_hdr;
923 sym_hashes = elf_sym_hashes (abfd);
924 local_got_refcounts = elf_local_got_refcounts (abfd);
925
926 sreloc = NULL;
927
928 rel_end = relocs + sec->reloc_count;
929 for (rel = relocs; rel < rel_end; rel++)
930 {
931 unsigned int r_type;
932 unsigned long r_symndx;
933 struct elf_link_hash_entry *h;
934
935 r_symndx = ELF64_R_SYM (rel->r_info);
936
937 if (r_symndx >= NUM_SHDR_ENTRIES (symtab_hdr))
938 {
939 (*_bfd_error_handler) (_("%B: bad symbol index: %d"),
940 abfd,
941 r_symndx);
942 return FALSE;
943 }
944
945 if (r_symndx < symtab_hdr->sh_info)
946 h = NULL;
947 else
948 {
949 h = sym_hashes[r_symndx - symtab_hdr->sh_info];
950 while (h->root.type == bfd_link_hash_indirect
951 || h->root.type == bfd_link_hash_warning)
952 h = (struct elf_link_hash_entry *) h->root.u.i.link;
953 }
954
955 /* Create got section and local_got_refcounts array if they
956 are needed. */
957 r_type = elf_s390_tls_transition (info,
958 ELF64_R_TYPE (rel->r_info),
959 h == NULL);
960 switch (r_type)
961 {
962 case R_390_GOT12:
963 case R_390_GOT16:
964 case R_390_GOT20:
965 case R_390_GOT32:
966 case R_390_GOT64:
967 case R_390_GOTENT:
968 case R_390_GOTPLT12:
969 case R_390_GOTPLT16:
970 case R_390_GOTPLT20:
971 case R_390_GOTPLT32:
972 case R_390_GOTPLT64:
973 case R_390_GOTPLTENT:
974 case R_390_TLS_GD64:
975 case R_390_TLS_GOTIE12:
976 case R_390_TLS_GOTIE20:
977 case R_390_TLS_GOTIE64:
978 case R_390_TLS_IEENT:
979 case R_390_TLS_IE64:
980 case R_390_TLS_LDM64:
981 if (h == NULL
982 && local_got_refcounts == NULL)
983 {
984 bfd_size_type size;
985
986 size = symtab_hdr->sh_info;
987 size *= (sizeof (bfd_signed_vma) + sizeof(char));
988 local_got_refcounts = ((bfd_signed_vma *)
989 bfd_zalloc (abfd, size));
990 if (local_got_refcounts == NULL)
991 return FALSE;
992 elf_local_got_refcounts (abfd) = local_got_refcounts;
993 elf_s390_local_got_tls_type (abfd)
994 = (char *) (local_got_refcounts + symtab_hdr->sh_info);
995 }
996 /* Fall through. */
997 case R_390_GOTOFF16:
998 case R_390_GOTOFF32:
999 case R_390_GOTOFF64:
1000 case R_390_GOTPC:
1001 case R_390_GOTPCDBL:
1002 if (htab->sgot == NULL)
1003 {
1004 if (htab->elf.dynobj == NULL)
1005 htab->elf.dynobj = abfd;
1006 if (!create_got_section (htab->elf.dynobj, info))
1007 return FALSE;
1008 }
1009 }
1010
1011 switch (r_type)
1012 {
1013 case R_390_GOTOFF16:
1014 case R_390_GOTOFF32:
1015 case R_390_GOTOFF64:
1016 case R_390_GOTPC:
1017 case R_390_GOTPCDBL:
1018 /* Got is created, nothing to be done. */
1019 break;
1020
1021 case R_390_PLT16DBL:
1022 case R_390_PLT32:
1023 case R_390_PLT32DBL:
1024 case R_390_PLT64:
1025 case R_390_PLTOFF16:
1026 case R_390_PLTOFF32:
1027 case R_390_PLTOFF64:
1028 /* This symbol requires a procedure linkage table entry. We
1029 actually build the entry in adjust_dynamic_symbol,
1030 because this might be a case of linking PIC code which is
1031 never referenced by a dynamic object, in which case we
1032 don't need to generate a procedure linkage table entry
1033 after all. */
1034
1035 /* If this is a local symbol, we resolve it directly without
1036 creating a procedure linkage table entry. */
1037 if (h != NULL)
1038 {
1039 h->needs_plt = 1;
1040 h->plt.refcount += 1;
1041 }
1042 break;
1043
1044 case R_390_GOTPLT12:
1045 case R_390_GOTPLT16:
1046 case R_390_GOTPLT20:
1047 case R_390_GOTPLT32:
1048 case R_390_GOTPLT64:
1049 case R_390_GOTPLTENT:
1050 /* This symbol requires either a procedure linkage table entry
1051 or an entry in the local got. We actually build the entry
1052 in adjust_dynamic_symbol because whether this is really a
1053 global reference can change and with it the fact if we have
1054 to create a plt entry or a local got entry. To be able to
1055 make a once global symbol a local one we have to keep track
1056 of the number of gotplt references that exist for this
1057 symbol. */
1058 if (h != NULL)
1059 {
1060 ((struct elf_s390_link_hash_entry *) h)->gotplt_refcount++;
1061 h->needs_plt = 1;
1062 h->plt.refcount += 1;
1063 }
1064 else
1065 local_got_refcounts[r_symndx] += 1;
1066 break;
1067
1068 case R_390_TLS_LDM64:
1069 htab->tls_ldm_got.refcount += 1;
1070 break;
1071
1072 case R_390_TLS_IE64:
1073 case R_390_TLS_GOTIE12:
1074 case R_390_TLS_GOTIE20:
1075 case R_390_TLS_GOTIE64:
1076 case R_390_TLS_IEENT:
1077 if (info->shared)
1078 info->flags |= DF_STATIC_TLS;
1079 /* Fall through */
1080
1081 case R_390_GOT12:
1082 case R_390_GOT16:
1083 case R_390_GOT20:
1084 case R_390_GOT32:
1085 case R_390_GOT64:
1086 case R_390_GOTENT:
1087 case R_390_TLS_GD64:
1088 /* This symbol requires a global offset table entry. */
1089 switch (r_type)
1090 {
1091 default:
1092 case R_390_GOT12:
1093 case R_390_GOT16:
1094 case R_390_GOT20:
1095 case R_390_GOT32:
1096 case R_390_GOTENT:
1097 tls_type = GOT_NORMAL;
1098 break;
1099 case R_390_TLS_GD64:
1100 tls_type = GOT_TLS_GD;
1101 break;
1102 case R_390_TLS_IE64:
1103 case R_390_TLS_GOTIE64:
1104 tls_type = GOT_TLS_IE;
1105 break;
1106 case R_390_TLS_GOTIE12:
1107 case R_390_TLS_GOTIE20:
1108 case R_390_TLS_IEENT:
1109 tls_type = GOT_TLS_IE_NLT;
1110 break;
1111 }
1112
1113 if (h != NULL)
1114 {
1115 h->got.refcount += 1;
1116 old_tls_type = elf_s390_hash_entry(h)->tls_type;
1117 }
1118 else
1119 {
1120 local_got_refcounts[r_symndx] += 1;
1121 old_tls_type = elf_s390_local_got_tls_type (abfd) [r_symndx];
1122 }
1123 /* If a TLS symbol is accessed using IE at least once,
1124 there is no point to use dynamic model for it. */
1125 if (old_tls_type != tls_type && old_tls_type != GOT_UNKNOWN)
1126 {
1127 if (old_tls_type == GOT_NORMAL || tls_type == GOT_NORMAL)
1128 {
1129 (*_bfd_error_handler)
1130 (_("%B: `%s' accessed both as normal and thread local symbol"),
1131 abfd, h->root.root.string);
1132 return FALSE;
1133 }
1134 if (old_tls_type > tls_type)
1135 tls_type = old_tls_type;
1136 }
1137
1138 if (old_tls_type != tls_type)
1139 {
1140 if (h != NULL)
1141 elf_s390_hash_entry (h)->tls_type = tls_type;
1142 else
1143 elf_s390_local_got_tls_type (abfd) [r_symndx] = tls_type;
1144 }
1145
1146 if (r_type != R_390_TLS_IE64)
1147 break;
1148 /* Fall through */
1149
1150 case R_390_TLS_LE64:
1151 if (!info->shared)
1152 break;
1153 info->flags |= DF_STATIC_TLS;
1154 /* Fall through */
1155
1156 case R_390_8:
1157 case R_390_16:
1158 case R_390_32:
1159 case R_390_64:
1160 case R_390_PC16:
1161 case R_390_PC16DBL:
1162 case R_390_PC32:
1163 case R_390_PC32DBL:
1164 case R_390_PC64:
1165 if (h != NULL && !info->shared)
1166 {
1167 /* If this reloc is in a read-only section, we might
1168 need a copy reloc. We can't check reliably at this
1169 stage whether the section is read-only, as input
1170 sections have not yet been mapped to output sections.
1171 Tentatively set the flag for now, and correct in
1172 adjust_dynamic_symbol. */
1173 h->non_got_ref = 1;
1174
1175 /* We may need a .plt entry if the function this reloc
1176 refers to is in a shared lib. */
1177 h->plt.refcount += 1;
1178 }
1179
1180 /* If we are creating a shared library, and this is a reloc
1181 against a global symbol, or a non PC relative reloc
1182 against a local symbol, then we need to copy the reloc
1183 into the shared library. However, if we are linking with
1184 -Bsymbolic, we do not need to copy a reloc against a
1185 global symbol which is defined in an object we are
1186 including in the link (i.e., DEF_REGULAR is set). At
1187 this point we have not seen all the input files, so it is
1188 possible that DEF_REGULAR is not set now but will be set
1189 later (it is never cleared). In case of a weak definition,
1190 DEF_REGULAR may be cleared later by a strong definition in
1191 a shared library. We account for that possibility below by
1192 storing information in the relocs_copied field of the hash
1193 table entry. A similar situation occurs when creating
1194 shared libraries and symbol visibility changes render the
1195 symbol local.
1196
1197 If on the other hand, we are creating an executable, we
1198 may need to keep relocations for symbols satisfied by a
1199 dynamic library if we manage to avoid copy relocs for the
1200 symbol. */
1201 if ((info->shared
1202 && (sec->flags & SEC_ALLOC) != 0
1203 && ((ELF64_R_TYPE (rel->r_info) != R_390_PC16
1204 && ELF64_R_TYPE (rel->r_info) != R_390_PC16DBL
1205 && ELF64_R_TYPE (rel->r_info) != R_390_PC32
1206 && ELF64_R_TYPE (rel->r_info) != R_390_PC32DBL
1207 && ELF64_R_TYPE (rel->r_info) != R_390_PC64)
1208 || (h != NULL
1209 && (! info->symbolic
1210 || h->root.type == bfd_link_hash_defweak
1211 || !h->def_regular))))
1212 || (ELIMINATE_COPY_RELOCS
1213 && !info->shared
1214 && (sec->flags & SEC_ALLOC) != 0
1215 && h != NULL
1216 && (h->root.type == bfd_link_hash_defweak
1217 || !h->def_regular)))
1218 {
1219 struct elf_s390_dyn_relocs *p;
1220 struct elf_s390_dyn_relocs **head;
1221
1222 /* We must copy these reloc types into the output file.
1223 Create a reloc section in dynobj and make room for
1224 this reloc. */
1225 if (sreloc == NULL)
1226 {
1227 const char *name;
1228 bfd *dynobj;
1229
1230 name = (bfd_elf_string_from_elf_section
1231 (abfd,
1232 elf_elfheader (abfd)->e_shstrndx,
1233 elf_section_data (sec)->rel_hdr.sh_name));
1234 if (name == NULL)
1235 return FALSE;
1236
1237 if (strncmp (name, ".rela", 5) != 0
1238 || strcmp (bfd_get_section_name (abfd, sec),
1239 name + 5) != 0)
1240 {
1241 (*_bfd_error_handler)
1242 (_("%B: bad relocation section name `%s\'"),
1243 abfd, name);
1244 }
1245
1246 if (htab->elf.dynobj == NULL)
1247 htab->elf.dynobj = abfd;
1248
1249 dynobj = htab->elf.dynobj;
1250 sreloc = bfd_get_section_by_name (dynobj, name);
1251 if (sreloc == NULL)
1252 {
1253 flagword flags;
1254
1255 flags = (SEC_HAS_CONTENTS | SEC_READONLY
1256 | SEC_IN_MEMORY | SEC_LINKER_CREATED);
1257 if ((sec->flags & SEC_ALLOC) != 0)
1258 flags |= SEC_ALLOC | SEC_LOAD;
1259 sreloc = bfd_make_section_with_flags (dynobj,
1260 name,
1261 flags);
1262 if (sreloc == NULL
1263 || ! bfd_set_section_alignment (dynobj, sreloc, 3))
1264 return FALSE;
1265 }
1266 elf_section_data (sec)->sreloc = sreloc;
1267 }
1268
1269 /* If this is a global symbol, we count the number of
1270 relocations we need for this symbol. */
1271 if (h != NULL)
1272 {
1273 head = &((struct elf_s390_link_hash_entry *) h)->dyn_relocs;
1274 }
1275 else
1276 {
1277 /* Track dynamic relocs needed for local syms too.
1278 We really need local syms available to do this
1279 easily. Oh well. */
1280
1281 asection *s;
1282 s = bfd_section_from_r_symndx (abfd, &htab->sym_sec,
1283 sec, r_symndx);
1284 if (s == NULL)
1285 return FALSE;
1286
1287 head = ((struct elf_s390_dyn_relocs **)
1288 &elf_section_data (s)->local_dynrel);
1289 }
1290
1291 p = *head;
1292 if (p == NULL || p->sec != sec)
1293 {
1294 bfd_size_type amt = sizeof *p;
1295 p = ((struct elf_s390_dyn_relocs *)
1296 bfd_alloc (htab->elf.dynobj, amt));
1297 if (p == NULL)
1298 return FALSE;
1299 p->next = *head;
1300 *head = p;
1301 p->sec = sec;
1302 p->count = 0;
1303 p->pc_count = 0;
1304 }
1305
1306 p->count += 1;
1307 if (ELF64_R_TYPE (rel->r_info) == R_390_PC16
1308 || ELF64_R_TYPE (rel->r_info) == R_390_PC16DBL
1309 || ELF64_R_TYPE (rel->r_info) == R_390_PC32
1310 || ELF64_R_TYPE (rel->r_info) == R_390_PC32DBL
1311 || ELF64_R_TYPE (rel->r_info) == R_390_PC64)
1312 p->pc_count += 1;
1313 }
1314 break;
1315
1316 /* This relocation describes the C++ object vtable hierarchy.
1317 Reconstruct it for later use during GC. */
1318 case R_390_GNU_VTINHERIT:
1319 if (!bfd_elf_gc_record_vtinherit (abfd, sec, h, rel->r_offset))
1320 return FALSE;
1321 break;
1322
1323 /* This relocation describes which C++ vtable entries are actually
1324 used. Record for later use during GC. */
1325 case R_390_GNU_VTENTRY:
1326 if (!bfd_elf_gc_record_vtentry (abfd, sec, h, rel->r_addend))
1327 return FALSE;
1328 break;
1329
1330 default:
1331 break;
1332 }
1333 }
1334
1335 return TRUE;
1336 }
1337
1338 /* Return the section that should be marked against GC for a given
1339 relocation. */
1340
1341 static asection *
1342 elf_s390_gc_mark_hook (sec, info, rel, h, sym)
1343 asection *sec;
1344 struct bfd_link_info *info ATTRIBUTE_UNUSED;
1345 Elf_Internal_Rela *rel;
1346 struct elf_link_hash_entry *h;
1347 Elf_Internal_Sym *sym;
1348 {
1349 if (h != NULL)
1350 {
1351 switch (ELF64_R_TYPE (rel->r_info))
1352 {
1353 case R_390_GNU_VTINHERIT:
1354 case R_390_GNU_VTENTRY:
1355 break;
1356
1357 default:
1358 switch (h->root.type)
1359 {
1360 case bfd_link_hash_defined:
1361 case bfd_link_hash_defweak:
1362 return h->root.u.def.section;
1363
1364 case bfd_link_hash_common:
1365 return h->root.u.c.p->section;
1366
1367 default:
1368 break;
1369 }
1370 }
1371 }
1372 else
1373 return bfd_section_from_elf_index (sec->owner, sym->st_shndx);
1374
1375 return NULL;
1376 }
1377
1378 /* Update the got entry reference counts for the section being removed. */
1379
1380 static bfd_boolean
1381 elf_s390_gc_sweep_hook (abfd, info, sec, relocs)
1382 bfd *abfd;
1383 struct bfd_link_info *info;
1384 asection *sec;
1385 const Elf_Internal_Rela *relocs;
1386 {
1387 Elf_Internal_Shdr *symtab_hdr;
1388 struct elf_link_hash_entry **sym_hashes;
1389 bfd_signed_vma *local_got_refcounts;
1390 const Elf_Internal_Rela *rel, *relend;
1391
1392 elf_section_data (sec)->local_dynrel = NULL;
1393
1394 symtab_hdr = &elf_tdata (abfd)->symtab_hdr;
1395 sym_hashes = elf_sym_hashes (abfd);
1396 local_got_refcounts = elf_local_got_refcounts (abfd);
1397
1398 relend = relocs + sec->reloc_count;
1399 for (rel = relocs; rel < relend; rel++)
1400 {
1401 unsigned long r_symndx;
1402 unsigned int r_type;
1403 struct elf_link_hash_entry *h = NULL;
1404
1405 r_symndx = ELF64_R_SYM (rel->r_info);
1406 if (r_symndx >= symtab_hdr->sh_info)
1407 {
1408 struct elf_s390_link_hash_entry *eh;
1409 struct elf_s390_dyn_relocs **pp;
1410 struct elf_s390_dyn_relocs *p;
1411
1412 h = sym_hashes[r_symndx - symtab_hdr->sh_info];
1413 while (h->root.type == bfd_link_hash_indirect
1414 || h->root.type == bfd_link_hash_warning)
1415 h = (struct elf_link_hash_entry *) h->root.u.i.link;
1416 eh = (struct elf_s390_link_hash_entry *) h;
1417
1418 for (pp = &eh->dyn_relocs; (p = *pp) != NULL; pp = &p->next)
1419 if (p->sec == sec)
1420 {
1421 /* Everything must go for SEC. */
1422 *pp = p->next;
1423 break;
1424 }
1425 }
1426
1427 r_type = ELF64_R_TYPE (rel->r_info);
1428 r_type = elf_s390_tls_transition (info, r_type, h != NULL);
1429 switch (r_type)
1430 {
1431 case R_390_TLS_LDM64:
1432 if (elf_s390_hash_table (info)->tls_ldm_got.refcount > 0)
1433 elf_s390_hash_table (info)->tls_ldm_got.refcount -= 1;
1434 break;
1435
1436 case R_390_TLS_GD64:
1437 case R_390_TLS_IE64:
1438 case R_390_TLS_GOTIE12:
1439 case R_390_TLS_GOTIE20:
1440 case R_390_TLS_GOTIE64:
1441 case R_390_TLS_IEENT:
1442 case R_390_GOT12:
1443 case R_390_GOT16:
1444 case R_390_GOT20:
1445 case R_390_GOT32:
1446 case R_390_GOT64:
1447 case R_390_GOTOFF16:
1448 case R_390_GOTOFF32:
1449 case R_390_GOTOFF64:
1450 case R_390_GOTPC:
1451 case R_390_GOTPCDBL:
1452 case R_390_GOTENT:
1453 if (h != NULL)
1454 {
1455 if (h->got.refcount > 0)
1456 h->got.refcount -= 1;
1457 }
1458 else if (local_got_refcounts != NULL)
1459 {
1460 if (local_got_refcounts[r_symndx] > 0)
1461 local_got_refcounts[r_symndx] -= 1;
1462 }
1463 break;
1464
1465 case R_390_8:
1466 case R_390_12:
1467 case R_390_16:
1468 case R_390_20:
1469 case R_390_32:
1470 case R_390_64:
1471 case R_390_PC16:
1472 case R_390_PC16DBL:
1473 case R_390_PC32:
1474 case R_390_PC32DBL:
1475 case R_390_PC64:
1476 if (info->shared)
1477 break;
1478 /* Fall through */
1479
1480 case R_390_PLT16DBL:
1481 case R_390_PLT32:
1482 case R_390_PLT32DBL:
1483 case R_390_PLT64:
1484 case R_390_PLTOFF16:
1485 case R_390_PLTOFF32:
1486 case R_390_PLTOFF64:
1487 if (h != NULL)
1488 {
1489 if (h->plt.refcount > 0)
1490 h->plt.refcount -= 1;
1491 }
1492 break;
1493
1494 case R_390_GOTPLT12:
1495 case R_390_GOTPLT16:
1496 case R_390_GOTPLT20:
1497 case R_390_GOTPLT32:
1498 case R_390_GOTPLT64:
1499 case R_390_GOTPLTENT:
1500 if (h != NULL)
1501 {
1502 if (h->plt.refcount > 0)
1503 {
1504 ((struct elf_s390_link_hash_entry *) h)->gotplt_refcount--;
1505 h->plt.refcount -= 1;
1506 }
1507 }
1508 else if (local_got_refcounts != NULL)
1509 {
1510 if (local_got_refcounts[r_symndx] > 0)
1511 local_got_refcounts[r_symndx] -= 1;
1512 }
1513 break;
1514
1515 default:
1516 break;
1517 }
1518 }
1519
1520 return TRUE;
1521 }
1522
1523 /* Make sure we emit a GOT entry if the symbol was supposed to have a PLT
1524 entry but we found we will not create any. Called when we find we will
1525 not have any PLT for this symbol, by for example
1526 elf_s390_adjust_dynamic_symbol when we're doing a proper dynamic link,
1527 or elf_s390_size_dynamic_sections if no dynamic sections will be
1528 created (we're only linking static objects). */
1529
1530 static void
1531 elf_s390_adjust_gotplt (h)
1532 struct elf_s390_link_hash_entry *h;
1533 {
1534 if (h->elf.root.type == bfd_link_hash_warning)
1535 h = (struct elf_s390_link_hash_entry *) h->elf.root.u.i.link;
1536
1537 if (h->gotplt_refcount <= 0)
1538 return;
1539
1540 /* We simply add the number of gotplt references to the number
1541 * of got references for this symbol. */
1542 h->elf.got.refcount += h->gotplt_refcount;
1543 h->gotplt_refcount = -1;
1544 }
1545
1546 /* Adjust a symbol defined by a dynamic object and referenced by a
1547 regular object. The current definition is in some section of the
1548 dynamic object, but we're not including those sections. We have to
1549 change the definition to something the rest of the link can
1550 understand. */
1551
1552 static bfd_boolean
1553 elf_s390_adjust_dynamic_symbol (info, h)
1554 struct bfd_link_info *info;
1555 struct elf_link_hash_entry *h;
1556 {
1557 struct elf_s390_link_hash_table *htab;
1558 asection *s;
1559 unsigned int power_of_two;
1560
1561 /* If this is a function, put it in the procedure linkage table. We
1562 will fill in the contents of the procedure linkage table later
1563 (although we could actually do it here). */
1564 if (h->type == STT_FUNC
1565 || h->needs_plt)
1566 {
1567 if (h->plt.refcount <= 0
1568 || (! info->shared
1569 && !h->def_dynamic
1570 && !h->ref_dynamic
1571 && h->root.type != bfd_link_hash_undefweak
1572 && h->root.type != bfd_link_hash_undefined))
1573 {
1574 /* This case can occur if we saw a PLT32 reloc in an input
1575 file, but the symbol was never referred to by a dynamic
1576 object, or if all references were garbage collected. In
1577 such a case, we don't actually need to build a procedure
1578 linkage table, and we can just do a PC32 reloc instead. */
1579 h->plt.offset = (bfd_vma) -1;
1580 h->needs_plt = 0;
1581 elf_s390_adjust_gotplt((struct elf_s390_link_hash_entry *) h);
1582 }
1583
1584 return TRUE;
1585 }
1586 else
1587 /* It's possible that we incorrectly decided a .plt reloc was
1588 needed for an R_390_PC32 reloc to a non-function sym in
1589 check_relocs. We can't decide accurately between function and
1590 non-function syms in check-relocs; Objects loaded later in
1591 the link may change h->type. So fix it now. */
1592 h->plt.offset = (bfd_vma) -1;
1593
1594 /* If this is a weak symbol, and there is a real definition, the
1595 processor independent code will have arranged for us to see the
1596 real definition first, and we can just use the same value. */
1597 if (h->u.weakdef != NULL)
1598 {
1599 BFD_ASSERT (h->u.weakdef->root.type == bfd_link_hash_defined
1600 || h->u.weakdef->root.type == bfd_link_hash_defweak);
1601 h->root.u.def.section = h->u.weakdef->root.u.def.section;
1602 h->root.u.def.value = h->u.weakdef->root.u.def.value;
1603 if (ELIMINATE_COPY_RELOCS || info->nocopyreloc)
1604 h->non_got_ref = h->u.weakdef->non_got_ref;
1605 return TRUE;
1606 }
1607
1608 /* This is a reference to a symbol defined by a dynamic object which
1609 is not a function. */
1610
1611 /* If we are creating a shared library, we must presume that the
1612 only references to the symbol are via the global offset table.
1613 For such cases we need not do anything here; the relocations will
1614 be handled correctly by relocate_section. */
1615 if (info->shared)
1616 return TRUE;
1617
1618 /* If there are no references to this symbol that do not use the
1619 GOT, we don't need to generate a copy reloc. */
1620 if (!h->non_got_ref)
1621 return TRUE;
1622
1623 /* If -z nocopyreloc was given, we won't generate them either. */
1624 if (info->nocopyreloc)
1625 {
1626 h->non_got_ref = 0;
1627 return TRUE;
1628 }
1629
1630 if (ELIMINATE_COPY_RELOCS)
1631 {
1632 struct elf_s390_link_hash_entry * eh;
1633 struct elf_s390_dyn_relocs *p;
1634
1635 eh = (struct elf_s390_link_hash_entry *) h;
1636 for (p = eh->dyn_relocs; p != NULL; p = p->next)
1637 {
1638 s = p->sec->output_section;
1639 if (s != NULL && (s->flags & SEC_READONLY) != 0)
1640 break;
1641 }
1642
1643 /* If we didn't find any dynamic relocs in read-only sections, then
1644 we'll be keeping the dynamic relocs and avoiding the copy reloc. */
1645 if (p == NULL)
1646 {
1647 h->non_got_ref = 0;
1648 return TRUE;
1649 }
1650 }
1651
1652 /* We must allocate the symbol in our .dynbss section, which will
1653 become part of the .bss section of the executable. There will be
1654 an entry for this symbol in the .dynsym section. The dynamic
1655 object will contain position independent code, so all references
1656 from the dynamic object to this symbol will go through the global
1657 offset table. The dynamic linker will use the .dynsym entry to
1658 determine the address it must put in the global offset table, so
1659 both the dynamic object and the regular object will refer to the
1660 same memory location for the variable. */
1661
1662 htab = elf_s390_hash_table (info);
1663
1664 /* We must generate a R_390_COPY reloc to tell the dynamic linker to
1665 copy the initial value out of the dynamic object and into the
1666 runtime process image. */
1667 if ((h->root.u.def.section->flags & SEC_ALLOC) != 0)
1668 {
1669 htab->srelbss->size += sizeof (Elf64_External_Rela);
1670 h->needs_copy = 1;
1671 }
1672
1673 /* We need to figure out the alignment required for this symbol. I
1674 have no idea how ELF linkers handle this. */
1675 power_of_two = bfd_log2 (h->size);
1676 if (power_of_two > 3)
1677 power_of_two = 3;
1678
1679 /* Apply the required alignment. */
1680 s = htab->sdynbss;
1681 s->size = BFD_ALIGN (s->size, (bfd_size_type) (1 << power_of_two));
1682 if (power_of_two > bfd_get_section_alignment (htab->elf.dynobj, s))
1683 {
1684 if (! bfd_set_section_alignment (htab->elf.dynobj, s, power_of_two))
1685 return FALSE;
1686 }
1687
1688 /* Define the symbol as being at this point in the section. */
1689 h->root.u.def.section = s;
1690 h->root.u.def.value = s->size;
1691
1692 /* Increment the section size to make room for the symbol. */
1693 s->size += h->size;
1694
1695 return TRUE;
1696 }
1697
1698 /* Allocate space in .plt, .got and associated reloc sections for
1699 dynamic relocs. */
1700
1701 static bfd_boolean
1702 allocate_dynrelocs (h, inf)
1703 struct elf_link_hash_entry *h;
1704 PTR inf;
1705 {
1706 struct bfd_link_info *info;
1707 struct elf_s390_link_hash_table *htab;
1708 struct elf_s390_link_hash_entry *eh;
1709 struct elf_s390_dyn_relocs *p;
1710
1711 if (h->root.type == bfd_link_hash_indirect)
1712 return TRUE;
1713
1714 if (h->root.type == bfd_link_hash_warning)
1715 /* When warning symbols are created, they **replace** the "real"
1716 entry in the hash table, thus we never get to see the real
1717 symbol in a hash traversal. So look at it now. */
1718 h = (struct elf_link_hash_entry *) h->root.u.i.link;
1719
1720 info = (struct bfd_link_info *) inf;
1721 htab = elf_s390_hash_table (info);
1722
1723 if (htab->elf.dynamic_sections_created
1724 && h->plt.refcount > 0
1725 && (ELF_ST_VISIBILITY (h->other) == STV_DEFAULT
1726 || h->root.type != bfd_link_hash_undefweak))
1727 {
1728 /* Make sure this symbol is output as a dynamic symbol.
1729 Undefined weak syms won't yet be marked as dynamic. */
1730 if (h->dynindx == -1
1731 && !h->forced_local)
1732 {
1733 if (! bfd_elf_link_record_dynamic_symbol (info, h))
1734 return FALSE;
1735 }
1736
1737 if (info->shared
1738 || WILL_CALL_FINISH_DYNAMIC_SYMBOL (1, 0, h))
1739 {
1740 asection *s = htab->splt;
1741
1742 /* If this is the first .plt entry, make room for the special
1743 first entry. */
1744 if (s->size == 0)
1745 s->size += PLT_FIRST_ENTRY_SIZE;
1746
1747 h->plt.offset = s->size;
1748
1749 /* If this symbol is not defined in a regular file, and we are
1750 not generating a shared library, then set the symbol to this
1751 location in the .plt. This is required to make function
1752 pointers compare as equal between the normal executable and
1753 the shared library. */
1754 if (! info->shared
1755 && !h->def_regular)
1756 {
1757 h->root.u.def.section = s;
1758 h->root.u.def.value = h->plt.offset;
1759 }
1760
1761 /* Make room for this entry. */
1762 s->size += PLT_ENTRY_SIZE;
1763
1764 /* We also need to make an entry in the .got.plt section, which
1765 will be placed in the .got section by the linker script. */
1766 htab->sgotplt->size += GOT_ENTRY_SIZE;
1767
1768 /* We also need to make an entry in the .rela.plt section. */
1769 htab->srelplt->size += sizeof (Elf64_External_Rela);
1770 }
1771 else
1772 {
1773 h->plt.offset = (bfd_vma) -1;
1774 h->needs_plt = 0;
1775 elf_s390_adjust_gotplt((struct elf_s390_link_hash_entry *) h);
1776 }
1777 }
1778 else
1779 {
1780 h->plt.offset = (bfd_vma) -1;
1781 h->needs_plt = 0;
1782 elf_s390_adjust_gotplt((struct elf_s390_link_hash_entry *) h);
1783 }
1784
1785 /* If R_390_TLS_{IE64,GOTIE64,GOTIE12,IEENT} symbol is now local to
1786 the binary, we can optimize a bit. IE64 and GOTIE64 get converted
1787 to R_390_TLS_LE64 requiring no TLS entry. For GOTIE12 and IEENT
1788 we can save the dynamic TLS relocation. */
1789 if (h->got.refcount > 0
1790 && !info->shared
1791 && h->dynindx == -1
1792 && elf_s390_hash_entry(h)->tls_type >= GOT_TLS_IE)
1793 {
1794 if (elf_s390_hash_entry(h)->tls_type == GOT_TLS_IE_NLT)
1795 /* For the GOTIE access without a literal pool entry the offset has
1796 to be stored somewhere. The immediate value in the instruction
1797 is not bit enough so the value is stored in the got. */
1798 {
1799 h->got.offset = htab->sgot->size;
1800 htab->sgot->size += GOT_ENTRY_SIZE;
1801 }
1802 else
1803 h->got.offset = (bfd_vma) -1;
1804 }
1805 else if (h->got.refcount > 0)
1806 {
1807 asection *s;
1808 bfd_boolean dyn;
1809 int tls_type = elf_s390_hash_entry(h)->tls_type;
1810
1811 /* Make sure this symbol is output as a dynamic symbol.
1812 Undefined weak syms won't yet be marked as dynamic. */
1813 if (h->dynindx == -1
1814 && !h->forced_local)
1815 {
1816 if (! bfd_elf_link_record_dynamic_symbol (info, h))
1817 return FALSE;
1818 }
1819
1820 s = htab->sgot;
1821 h->got.offset = s->size;
1822 s->size += GOT_ENTRY_SIZE;
1823 /* R_390_TLS_GD64 needs 2 consecutive GOT slots. */
1824 if (tls_type == GOT_TLS_GD)
1825 s->size += GOT_ENTRY_SIZE;
1826 dyn = htab->elf.dynamic_sections_created;
1827 /* R_390_TLS_IE64 needs one dynamic relocation,
1828 R_390_TLS_GD64 needs one if local symbol and two if global. */
1829 if ((tls_type == GOT_TLS_GD && h->dynindx == -1)
1830 || tls_type >= GOT_TLS_IE)
1831 htab->srelgot->size += sizeof (Elf64_External_Rela);
1832 else if (tls_type == GOT_TLS_GD)
1833 htab->srelgot->size += 2 * sizeof (Elf64_External_Rela);
1834 else if ((ELF_ST_VISIBILITY (h->other) == STV_DEFAULT
1835 || h->root.type != bfd_link_hash_undefweak)
1836 && (info->shared
1837 || WILL_CALL_FINISH_DYNAMIC_SYMBOL (dyn, 0, h)))
1838 htab->srelgot->size += sizeof (Elf64_External_Rela);
1839 }
1840 else
1841 h->got.offset = (bfd_vma) -1;
1842
1843 eh = (struct elf_s390_link_hash_entry *) h;
1844 if (eh->dyn_relocs == NULL)
1845 return TRUE;
1846
1847 /* In the shared -Bsymbolic case, discard space allocated for
1848 dynamic pc-relative relocs against symbols which turn out to be
1849 defined in regular objects. For the normal shared case, discard
1850 space for pc-relative relocs that have become local due to symbol
1851 visibility changes. */
1852
1853 if (info->shared)
1854 {
1855 if (SYMBOL_REFERENCES_LOCAL (info, h))
1856 {
1857 struct elf_s390_dyn_relocs **pp;
1858
1859 for (pp = &eh->dyn_relocs; (p = *pp) != NULL; )
1860 {
1861 p->count -= p->pc_count;
1862 p->pc_count = 0;
1863 if (p->count == 0)
1864 *pp = p->next;
1865 else
1866 pp = &p->next;
1867 }
1868 }
1869
1870 /* Also discard relocs on undefined weak syms with non-default
1871 visibility. */
1872 if (ELF_ST_VISIBILITY (h->other) != STV_DEFAULT
1873 && h->root.type == bfd_link_hash_undefweak)
1874 eh->dyn_relocs = NULL;
1875 }
1876 else if (ELIMINATE_COPY_RELOCS)
1877 {
1878 /* For the non-shared case, discard space for relocs against
1879 symbols which turn out to need copy relocs or are not
1880 dynamic. */
1881
1882 if (!h->non_got_ref
1883 && ((h->def_dynamic
1884 && !h->def_regular)
1885 || (htab->elf.dynamic_sections_created
1886 && (h->root.type == bfd_link_hash_undefweak
1887 || h->root.type == bfd_link_hash_undefined))))
1888 {
1889 /* Make sure this symbol is output as a dynamic symbol.
1890 Undefined weak syms won't yet be marked as dynamic. */
1891 if (h->dynindx == -1
1892 && !h->forced_local)
1893 {
1894 if (! bfd_elf_link_record_dynamic_symbol (info, h))
1895 return FALSE;
1896 }
1897
1898 /* If that succeeded, we know we'll be keeping all the
1899 relocs. */
1900 if (h->dynindx != -1)
1901 goto keep;
1902 }
1903
1904 eh->dyn_relocs = NULL;
1905
1906 keep: ;
1907 }
1908
1909 /* Finally, allocate space. */
1910 for (p = eh->dyn_relocs; p != NULL; p = p->next)
1911 {
1912 asection *sreloc = elf_section_data (p->sec)->sreloc;
1913 sreloc->size += p->count * sizeof (Elf64_External_Rela);
1914 }
1915
1916 return TRUE;
1917 }
1918
1919 /* Find any dynamic relocs that apply to read-only sections. */
1920
1921 static bfd_boolean
1922 readonly_dynrelocs (h, inf)
1923 struct elf_link_hash_entry *h;
1924 PTR inf;
1925 {
1926 struct elf_s390_link_hash_entry *eh;
1927 struct elf_s390_dyn_relocs *p;
1928
1929 if (h->root.type == bfd_link_hash_warning)
1930 h = (struct elf_link_hash_entry *) h->root.u.i.link;
1931
1932 eh = (struct elf_s390_link_hash_entry *) h;
1933 for (p = eh->dyn_relocs; p != NULL; p = p->next)
1934 {
1935 asection *s = p->sec->output_section;
1936
1937 if (s != NULL && (s->flags & SEC_READONLY) != 0)
1938 {
1939 struct bfd_link_info *info = (struct bfd_link_info *) inf;
1940
1941 info->flags |= DF_TEXTREL;
1942
1943 /* Not an error, just cut short the traversal. */
1944 return FALSE;
1945 }
1946 }
1947 return TRUE;
1948 }
1949
1950 /* Set the sizes of the dynamic sections. */
1951
1952 static bfd_boolean
1953 elf_s390_size_dynamic_sections (output_bfd, info)
1954 bfd *output_bfd ATTRIBUTE_UNUSED;
1955 struct bfd_link_info *info;
1956 {
1957 struct elf_s390_link_hash_table *htab;
1958 bfd *dynobj;
1959 asection *s;
1960 bfd_boolean relocs;
1961 bfd *ibfd;
1962
1963 htab = elf_s390_hash_table (info);
1964 dynobj = htab->elf.dynobj;
1965 if (dynobj == NULL)
1966 abort ();
1967
1968 if (htab->elf.dynamic_sections_created)
1969 {
1970 /* Set the contents of the .interp section to the interpreter. */
1971 if (info->executable)
1972 {
1973 s = bfd_get_section_by_name (dynobj, ".interp");
1974 if (s == NULL)
1975 abort ();
1976 s->size = sizeof ELF_DYNAMIC_INTERPRETER;
1977 s->contents = (unsigned char *) ELF_DYNAMIC_INTERPRETER;
1978 }
1979 }
1980
1981 /* Set up .got offsets for local syms, and space for local dynamic
1982 relocs. */
1983 for (ibfd = info->input_bfds; ibfd != NULL; ibfd = ibfd->link_next)
1984 {
1985 bfd_signed_vma *local_got;
1986 bfd_signed_vma *end_local_got;
1987 char *local_tls_type;
1988 bfd_size_type locsymcount;
1989 Elf_Internal_Shdr *symtab_hdr;
1990 asection *srela;
1991
1992 if (bfd_get_flavour (ibfd) != bfd_target_elf_flavour)
1993 continue;
1994
1995 for (s = ibfd->sections; s != NULL; s = s->next)
1996 {
1997 struct elf_s390_dyn_relocs *p;
1998
1999 for (p = *((struct elf_s390_dyn_relocs **)
2000 &elf_section_data (s)->local_dynrel);
2001 p != NULL;
2002 p = p->next)
2003 {
2004 if (!bfd_is_abs_section (p->sec)
2005 && bfd_is_abs_section (p->sec->output_section))
2006 {
2007 /* Input section has been discarded, either because
2008 it is a copy of a linkonce section or due to
2009 linker script /DISCARD/, so we'll be discarding
2010 the relocs too. */
2011 }
2012 else if (p->count != 0)
2013 {
2014 srela = elf_section_data (p->sec)->sreloc;
2015 srela->size += p->count * sizeof (Elf64_External_Rela);
2016 if ((p->sec->output_section->flags & SEC_READONLY) != 0)
2017 info->flags |= DF_TEXTREL;
2018 }
2019 }
2020 }
2021
2022 local_got = elf_local_got_refcounts (ibfd);
2023 if (!local_got)
2024 continue;
2025
2026 symtab_hdr = &elf_tdata (ibfd)->symtab_hdr;
2027 locsymcount = symtab_hdr->sh_info;
2028 end_local_got = local_got + locsymcount;
2029 local_tls_type = elf_s390_local_got_tls_type (ibfd);
2030 s = htab->sgot;
2031 srela = htab->srelgot;
2032 for (; local_got < end_local_got; ++local_got, ++local_tls_type)
2033 {
2034 if (*local_got > 0)
2035 {
2036 *local_got = s->size;
2037 s->size += GOT_ENTRY_SIZE;
2038 if (*local_tls_type == GOT_TLS_GD)
2039 s->size += GOT_ENTRY_SIZE;
2040 if (info->shared)
2041 srela->size += sizeof (Elf64_External_Rela);
2042 }
2043 else
2044 *local_got = (bfd_vma) -1;
2045 }
2046 }
2047
2048 if (htab->tls_ldm_got.refcount > 0)
2049 {
2050 /* Allocate 2 got entries and 1 dynamic reloc for R_390_TLS_LDM64
2051 relocs. */
2052 htab->tls_ldm_got.offset = htab->sgot->size;
2053 htab->sgot->size += 2 * GOT_ENTRY_SIZE;
2054 htab->srelgot->size += sizeof (Elf64_External_Rela);
2055 }
2056 else
2057 htab->tls_ldm_got.offset = -1;
2058
2059 /* Allocate global sym .plt and .got entries, and space for global
2060 sym dynamic relocs. */
2061 elf_link_hash_traverse (&htab->elf, allocate_dynrelocs, (PTR) info);
2062
2063 /* We now have determined the sizes of the various dynamic sections.
2064 Allocate memory for them. */
2065 relocs = FALSE;
2066 for (s = dynobj->sections; s != NULL; s = s->next)
2067 {
2068 if ((s->flags & SEC_LINKER_CREATED) == 0)
2069 continue;
2070
2071 if (s == htab->splt
2072 || s == htab->sgot
2073 || s == htab->sgotplt)
2074 {
2075 /* Strip this section if we don't need it; see the
2076 comment below. */
2077 }
2078 else if (strncmp (bfd_get_section_name (dynobj, s), ".rela", 5) == 0)
2079 {
2080 if (s->size != 0 && s != htab->srelplt)
2081 relocs = TRUE;
2082
2083 /* We use the reloc_count field as a counter if we need
2084 to copy relocs into the output file. */
2085 s->reloc_count = 0;
2086 }
2087 else
2088 {
2089 /* It's not one of our sections, so don't allocate space. */
2090 continue;
2091 }
2092
2093 if (s->size == 0)
2094 {
2095 /* If we don't need this section, strip it from the
2096 output file. This is to handle .rela.bss and
2097 .rela.plt. We must create it in
2098 create_dynamic_sections, because it must be created
2099 before the linker maps input sections to output
2100 sections. The linker does that before
2101 adjust_dynamic_symbol is called, and it is that
2102 function which decides whether anything needs to go
2103 into these sections. */
2104
2105 s->flags |= SEC_EXCLUDE;
2106 continue;
2107 }
2108
2109 /* Allocate memory for the section contents. We use bfd_zalloc
2110 here in case unused entries are not reclaimed before the
2111 section's contents are written out. This should not happen,
2112 but this way if it does, we get a R_390_NONE reloc instead
2113 of garbage. */
2114 s->contents = (bfd_byte *) bfd_zalloc (dynobj, s->size);
2115 if (s->contents == NULL)
2116 return FALSE;
2117 }
2118
2119 if (htab->elf.dynamic_sections_created)
2120 {
2121 /* Add some entries to the .dynamic section. We fill in the
2122 values later, in elf_s390_finish_dynamic_sections, but we
2123 must add the entries now so that we get the correct size for
2124 the .dynamic section. The DT_DEBUG entry is filled in by the
2125 dynamic linker and used by the debugger. */
2126 #define add_dynamic_entry(TAG, VAL) \
2127 _bfd_elf_add_dynamic_entry (info, TAG, VAL)
2128
2129 if (info->executable)
2130 {
2131 if (!add_dynamic_entry (DT_DEBUG, 0))
2132 return FALSE;
2133 }
2134
2135 if (htab->splt->size != 0)
2136 {
2137 if (!add_dynamic_entry (DT_PLTGOT, 0)
2138 || !add_dynamic_entry (DT_PLTRELSZ, 0)
2139 || !add_dynamic_entry (DT_PLTREL, DT_RELA)
2140 || !add_dynamic_entry (DT_JMPREL, 0))
2141 return FALSE;
2142 }
2143
2144 if (relocs)
2145 {
2146 if (!add_dynamic_entry (DT_RELA, 0)
2147 || !add_dynamic_entry (DT_RELASZ, 0)
2148 || !add_dynamic_entry (DT_RELAENT, sizeof (Elf64_External_Rela)))
2149 return FALSE;
2150
2151 /* If any dynamic relocs apply to a read-only section,
2152 then we need a DT_TEXTREL entry. */
2153 if ((info->flags & DF_TEXTREL) == 0)
2154 elf_link_hash_traverse (&htab->elf, readonly_dynrelocs,
2155 (PTR) info);
2156
2157 if ((info->flags & DF_TEXTREL) != 0)
2158 {
2159 if (!add_dynamic_entry (DT_TEXTREL, 0))
2160 return FALSE;
2161 }
2162 }
2163 }
2164 #undef add_dynamic_entry
2165
2166 return TRUE;
2167 }
2168
2169 /* Return the base VMA address which should be subtracted from real addresses
2170 when resolving @dtpoff relocation.
2171 This is PT_TLS segment p_vaddr. */
2172
2173 static bfd_vma
2174 dtpoff_base (info)
2175 struct bfd_link_info *info;
2176 {
2177 /* If tls_sec is NULL, we should have signalled an error already. */
2178 if (elf_hash_table (info)->tls_sec == NULL)
2179 return 0;
2180 return elf_hash_table (info)->tls_sec->vma;
2181 }
2182
2183 /* Return the relocation value for @tpoff relocation
2184 if STT_TLS virtual address is ADDRESS. */
2185
2186 static bfd_vma
2187 tpoff (info, address)
2188 struct bfd_link_info *info;
2189 bfd_vma address;
2190 {
2191 struct elf_link_hash_table *htab = elf_hash_table (info);
2192
2193 /* If tls_sec is NULL, we should have signalled an error already. */
2194 if (htab->tls_sec == NULL)
2195 return 0;
2196 return htab->tls_size + htab->tls_sec->vma - address;
2197 }
2198
2199 /* Complain if TLS instruction relocation is against an invalid
2200 instruction. */
2201
2202 static void
2203 invalid_tls_insn (input_bfd, input_section, rel)
2204 bfd *input_bfd;
2205 asection *input_section;
2206 Elf_Internal_Rela *rel;
2207 {
2208 reloc_howto_type *howto;
2209
2210 howto = elf_howto_table + ELF64_R_TYPE (rel->r_info);
2211 (*_bfd_error_handler)
2212 (_("%B(%A+0x%lx): invalid instruction for TLS relocation %s"),
2213 input_bfd,
2214 input_section,
2215 (long) rel->r_offset,
2216 howto->name);
2217 }
2218
2219 /* Relocate a 390 ELF section. */
2220
2221 static bfd_boolean
2222 elf_s390_relocate_section (output_bfd, info, input_bfd, input_section,
2223 contents, relocs, local_syms, local_sections)
2224 bfd *output_bfd;
2225 struct bfd_link_info *info;
2226 bfd *input_bfd;
2227 asection *input_section;
2228 bfd_byte *contents;
2229 Elf_Internal_Rela *relocs;
2230 Elf_Internal_Sym *local_syms;
2231 asection **local_sections;
2232 {
2233 struct elf_s390_link_hash_table *htab;
2234 Elf_Internal_Shdr *symtab_hdr;
2235 struct elf_link_hash_entry **sym_hashes;
2236 bfd_vma *local_got_offsets;
2237 Elf_Internal_Rela *rel;
2238 Elf_Internal_Rela *relend;
2239
2240 if (info->relocatable)
2241 return TRUE;
2242
2243 htab = elf_s390_hash_table (info);
2244 symtab_hdr = &elf_tdata (input_bfd)->symtab_hdr;
2245 sym_hashes = elf_sym_hashes (input_bfd);
2246 local_got_offsets = elf_local_got_offsets (input_bfd);
2247
2248 rel = relocs;
2249 relend = relocs + input_section->reloc_count;
2250 for (; rel < relend; rel++)
2251 {
2252 unsigned int r_type;
2253 reloc_howto_type *howto;
2254 unsigned long r_symndx;
2255 struct elf_link_hash_entry *h;
2256 Elf_Internal_Sym *sym;
2257 asection *sec;
2258 bfd_vma off;
2259 bfd_vma relocation;
2260 bfd_boolean unresolved_reloc;
2261 bfd_reloc_status_type r;
2262 int tls_type;
2263
2264 r_type = ELF64_R_TYPE (rel->r_info);
2265 if (r_type == (int) R_390_GNU_VTINHERIT
2266 || r_type == (int) R_390_GNU_VTENTRY)
2267 continue;
2268 if (r_type >= (int) R_390_max)
2269 {
2270 bfd_set_error (bfd_error_bad_value);
2271 return FALSE;
2272 }
2273
2274 howto = elf_howto_table + r_type;
2275 r_symndx = ELF64_R_SYM (rel->r_info);
2276
2277 /* This is a final link. */
2278 h = NULL;
2279 sym = NULL;
2280 sec = NULL;
2281 unresolved_reloc = FALSE;
2282 if (r_symndx < symtab_hdr->sh_info)
2283 {
2284 sym = local_syms + r_symndx;
2285 sec = local_sections[r_symndx];
2286 relocation = _bfd_elf_rela_local_sym (output_bfd, sym, &sec, rel);
2287 }
2288 else
2289 {
2290 bfd_boolean warned ATTRIBUTE_UNUSED;
2291
2292 RELOC_FOR_GLOBAL_SYMBOL (info, input_bfd, input_section, rel,
2293 r_symndx, symtab_hdr, sym_hashes,
2294 h, sec, relocation,
2295 unresolved_reloc, warned);
2296 }
2297
2298 switch (r_type)
2299 {
2300 case R_390_GOTPLT12:
2301 case R_390_GOTPLT16:
2302 case R_390_GOTPLT20:
2303 case R_390_GOTPLT32:
2304 case R_390_GOTPLT64:
2305 case R_390_GOTPLTENT:
2306 /* There are three cases for a GOTPLT relocation. 1) The
2307 relocation is against the jump slot entry of a plt that
2308 will get emitted to the output file. 2) The relocation
2309 is against the jump slot of a plt entry that has been
2310 removed. elf_s390_adjust_gotplt has created a GOT entry
2311 as replacement. 3) The relocation is against a local symbol.
2312 Cases 2) and 3) are the same as the GOT relocation code
2313 so we just have to test for case 1 and fall through for
2314 the other two. */
2315 if (h != NULL && h->plt.offset != (bfd_vma) -1)
2316 {
2317 bfd_vma plt_index;
2318
2319 /* Calc. index no.
2320 Current offset - size first entry / entry size. */
2321 plt_index = (h->plt.offset - PLT_FIRST_ENTRY_SIZE) /
2322 PLT_ENTRY_SIZE;
2323
2324 /* Offset in GOT is PLT index plus GOT headers(3) times 4,
2325 addr & GOT addr. */
2326 relocation = (plt_index + 3) * GOT_ENTRY_SIZE;
2327 unresolved_reloc = FALSE;
2328
2329 if (r_type == R_390_GOTPLTENT)
2330 relocation += htab->sgot->output_section->vma;
2331 break;
2332 }
2333 /* Fall through. */
2334
2335 case R_390_GOT12:
2336 case R_390_GOT16:
2337 case R_390_GOT20:
2338 case R_390_GOT32:
2339 case R_390_GOT64:
2340 case R_390_GOTENT:
2341 /* Relocation is to the entry for this symbol in the global
2342 offset table. */
2343 if (htab->sgot == NULL)
2344 abort ();
2345
2346 if (h != NULL)
2347 {
2348 bfd_boolean dyn;
2349
2350 off = h->got.offset;
2351 dyn = htab->elf.dynamic_sections_created;
2352 if (! WILL_CALL_FINISH_DYNAMIC_SYMBOL (dyn, info->shared, h)
2353 || (info->shared
2354 && (info->symbolic
2355 || h->dynindx == -1
2356 || h->forced_local)
2357 && h->def_regular)
2358 || (ELF_ST_VISIBILITY (h->other)
2359 && h->root.type == bfd_link_hash_undefweak))
2360 {
2361 /* This is actually a static link, or it is a
2362 -Bsymbolic link and the symbol is defined
2363 locally, or the symbol was forced to be local
2364 because of a version file. We must initialize
2365 this entry in the global offset table. Since the
2366 offset must always be a multiple of 2, we use the
2367 least significant bit to record whether we have
2368 initialized it already.
2369
2370 When doing a dynamic link, we create a .rel.got
2371 relocation entry to initialize the value. This
2372 is done in the finish_dynamic_symbol routine. */
2373 if ((off & 1) != 0)
2374 off &= ~1;
2375 else
2376 {
2377 bfd_put_64 (output_bfd, relocation,
2378 htab->sgot->contents + off);
2379 h->got.offset |= 1;
2380 }
2381 }
2382 else
2383 unresolved_reloc = FALSE;
2384 }
2385 else
2386 {
2387 if (local_got_offsets == NULL)
2388 abort ();
2389
2390 off = local_got_offsets[r_symndx];
2391
2392 /* The offset must always be a multiple of 8. We use
2393 the least significant bit to record whether we have
2394 already generated the necessary reloc. */
2395 if ((off & 1) != 0)
2396 off &= ~1;
2397 else
2398 {
2399 bfd_put_64 (output_bfd, relocation,
2400 htab->sgot->contents + off);
2401
2402 if (info->shared)
2403 {
2404 asection *s;
2405 Elf_Internal_Rela outrel;
2406 bfd_byte *loc;
2407
2408 s = htab->srelgot;
2409 if (s == NULL)
2410 abort ();
2411
2412 outrel.r_offset = (htab->sgot->output_section->vma
2413 + htab->sgot->output_offset
2414 + off);
2415 outrel.r_info = ELF64_R_INFO (0, R_390_RELATIVE);
2416 outrel.r_addend = relocation;
2417 loc = s->contents;
2418 loc += s->reloc_count++ * sizeof (Elf64_External_Rela);
2419 bfd_elf64_swap_reloca_out (output_bfd, &outrel, loc);
2420 }
2421
2422 local_got_offsets[r_symndx] |= 1;
2423 }
2424 }
2425
2426 if (off >= (bfd_vma) -2)
2427 abort ();
2428
2429 relocation = htab->sgot->output_offset + off;
2430
2431 /* For @GOTENT the relocation is against the offset between
2432 the instruction and the symbols entry in the GOT and not
2433 between the start of the GOT and the symbols entry. We
2434 add the vma of the GOT to get the correct value. */
2435 if ( r_type == R_390_GOTENT
2436 || r_type == R_390_GOTPLTENT)
2437 relocation += htab->sgot->output_section->vma;
2438
2439 break;
2440
2441 case R_390_GOTOFF16:
2442 case R_390_GOTOFF32:
2443 case R_390_GOTOFF64:
2444 /* Relocation is relative to the start of the global offset
2445 table. */
2446
2447 /* Note that sgot->output_offset is not involved in this
2448 calculation. We always want the start of .got. If we
2449 defined _GLOBAL_OFFSET_TABLE in a different way, as is
2450 permitted by the ABI, we might have to change this
2451 calculation. */
2452 relocation -= htab->sgot->output_section->vma;
2453 break;
2454
2455 case R_390_GOTPC:
2456 case R_390_GOTPCDBL:
2457 /* Use global offset table as symbol value. */
2458 relocation = htab->sgot->output_section->vma;
2459 unresolved_reloc = FALSE;
2460 break;
2461
2462 case R_390_PLT16DBL:
2463 case R_390_PLT32:
2464 case R_390_PLT32DBL:
2465 case R_390_PLT64:
2466 /* Relocation is to the entry for this symbol in the
2467 procedure linkage table. */
2468
2469 /* Resolve a PLT32 reloc against a local symbol directly,
2470 without using the procedure linkage table. */
2471 if (h == NULL)
2472 break;
2473
2474 if (h->plt.offset == (bfd_vma) -1
2475 || htab->splt == NULL)
2476 {
2477 /* We didn't make a PLT entry for this symbol. This
2478 happens when statically linking PIC code, or when
2479 using -Bsymbolic. */
2480 break;
2481 }
2482
2483 relocation = (htab->splt->output_section->vma
2484 + htab->splt->output_offset
2485 + h->plt.offset);
2486 unresolved_reloc = FALSE;
2487 break;
2488
2489 case R_390_PLTOFF16:
2490 case R_390_PLTOFF32:
2491 case R_390_PLTOFF64:
2492 /* Relocation is to the entry for this symbol in the
2493 procedure linkage table relative to the start of the GOT. */
2494
2495 /* For local symbols or if we didn't make a PLT entry for
2496 this symbol resolve the symbol directly. */
2497 if ( h == NULL
2498 || h->plt.offset == (bfd_vma) -1
2499 || htab->splt == NULL)
2500 {
2501 relocation -= htab->sgot->output_section->vma;
2502 break;
2503 }
2504
2505 relocation = (htab->splt->output_section->vma
2506 + htab->splt->output_offset
2507 + h->plt.offset
2508 - htab->sgot->output_section->vma);
2509 unresolved_reloc = FALSE;
2510 break;
2511
2512 case R_390_8:
2513 case R_390_16:
2514 case R_390_32:
2515 case R_390_64:
2516 case R_390_PC16:
2517 case R_390_PC16DBL:
2518 case R_390_PC32:
2519 case R_390_PC32DBL:
2520 case R_390_PC64:
2521 /* r_symndx will be zero only for relocs against symbols
2522 from removed linkonce sections, or sections discarded by
2523 a linker script. */
2524 if (r_symndx == 0
2525 || (input_section->flags & SEC_ALLOC) == 0)
2526 break;
2527
2528 if ((info->shared
2529 && (h == NULL
2530 || ELF_ST_VISIBILITY (h->other) == STV_DEFAULT
2531 || h->root.type != bfd_link_hash_undefweak)
2532 && ((r_type != R_390_PC16
2533 && r_type != R_390_PC16DBL
2534 && r_type != R_390_PC32
2535 && r_type != R_390_PC32DBL
2536 && r_type != R_390_PC64)
2537 || (h != NULL
2538 && !SYMBOL_REFERENCES_LOCAL (info, h))))
2539 || (ELIMINATE_COPY_RELOCS
2540 && !info->shared
2541 && h != NULL
2542 && h->dynindx != -1
2543 && !h->non_got_ref
2544 && ((h->def_dynamic
2545 && !h->def_regular)
2546 || h->root.type == bfd_link_hash_undefweak
2547 || h->root.type == bfd_link_hash_undefined)))
2548 {
2549 Elf_Internal_Rela outrel;
2550 bfd_boolean skip, relocate;
2551 asection *sreloc;
2552 bfd_byte *loc;
2553
2554 /* When generating a shared object, these relocations
2555 are copied into the output file to be resolved at run
2556 time. */
2557 skip = FALSE;
2558 relocate = FALSE;
2559
2560 outrel.r_offset =
2561 _bfd_elf_section_offset (output_bfd, info, input_section,
2562 rel->r_offset);
2563 if (outrel.r_offset == (bfd_vma) -1)
2564 skip = TRUE;
2565 else if (outrel.r_offset == (bfd_vma) -2)
2566 skip = TRUE, relocate = TRUE;
2567
2568 outrel.r_offset += (input_section->output_section->vma
2569 + input_section->output_offset);
2570
2571 if (skip)
2572 memset (&outrel, 0, sizeof outrel);
2573 else if (h != NULL
2574 && h->dynindx != -1
2575 && (r_type == R_390_PC16
2576 || r_type == R_390_PC16DBL
2577 || r_type == R_390_PC32
2578 || r_type == R_390_PC32DBL
2579 || r_type == R_390_PC64
2580 || !info->shared
2581 || !info->symbolic
2582 || !h->def_regular))
2583 {
2584 outrel.r_info = ELF64_R_INFO (h->dynindx, r_type);
2585 outrel.r_addend = rel->r_addend;
2586 }
2587 else
2588 {
2589 /* This symbol is local, or marked to become local. */
2590 outrel.r_addend = relocation + rel->r_addend;
2591 if (r_type == R_390_64)
2592 {
2593 relocate = TRUE;
2594 outrel.r_info = ELF64_R_INFO (0, R_390_RELATIVE);
2595 }
2596 else
2597 {
2598 long sindx;
2599
2600 if (bfd_is_abs_section (sec))
2601 sindx = 0;
2602 else if (sec == NULL || sec->owner == NULL)
2603 {
2604 bfd_set_error(bfd_error_bad_value);
2605 return FALSE;
2606 }
2607 else
2608 {
2609 asection *osec;
2610
2611 osec = sec->output_section;
2612 sindx = elf_section_data (osec)->dynindx;
2613 BFD_ASSERT (sindx > 0);
2614
2615 /* We are turning this relocation into one
2616 against a section symbol, so subtract out
2617 the output section's address but not the
2618 offset of the input section in the output
2619 section. */
2620
2621 outrel.r_addend -= osec->vma;
2622 }
2623 outrel.r_info = ELF64_R_INFO (sindx, r_type);
2624 }
2625 }
2626
2627 sreloc = elf_section_data (input_section)->sreloc;
2628 if (sreloc == NULL)
2629 abort ();
2630
2631 loc = sreloc->contents;
2632 loc += sreloc->reloc_count++ * sizeof (Elf64_External_Rela);
2633 bfd_elf64_swap_reloca_out (output_bfd, &outrel, loc);
2634
2635 /* If this reloc is against an external symbol, we do
2636 not want to fiddle with the addend. Otherwise, we
2637 need to include the symbol value so that it becomes
2638 an addend for the dynamic reloc. */
2639 if (! relocate)
2640 continue;
2641 }
2642
2643 break;
2644
2645 /* Relocations for tls literal pool entries. */
2646 case R_390_TLS_IE64:
2647 if (info->shared)
2648 {
2649 Elf_Internal_Rela outrel;
2650 asection *sreloc;
2651 bfd_byte *loc;
2652
2653 outrel.r_offset = rel->r_offset
2654 + input_section->output_section->vma
2655 + input_section->output_offset;
2656 outrel.r_info = ELF64_R_INFO (0, R_390_RELATIVE);
2657 sreloc = elf_section_data (input_section)->sreloc;
2658 if (sreloc == NULL)
2659 abort ();
2660 loc = sreloc->contents;
2661 loc += sreloc->reloc_count++ * sizeof (Elf64_External_Rela);
2662 bfd_elf64_swap_reloc_out (output_bfd, &outrel, loc);
2663 }
2664 /* Fall through. */
2665
2666 case R_390_TLS_GD64:
2667 case R_390_TLS_GOTIE64:
2668 r_type = elf_s390_tls_transition (info, r_type, h == NULL);
2669 tls_type = GOT_UNKNOWN;
2670 if (h == NULL && local_got_offsets)
2671 tls_type = elf_s390_local_got_tls_type (input_bfd) [r_symndx];
2672 else if (h != NULL)
2673 {
2674 tls_type = elf_s390_hash_entry(h)->tls_type;
2675 if (!info->shared && h->dynindx == -1 && tls_type >= GOT_TLS_IE)
2676 r_type = R_390_TLS_LE64;
2677 }
2678 if (r_type == R_390_TLS_GD64 && tls_type >= GOT_TLS_IE)
2679 r_type = R_390_TLS_IE64;
2680
2681 if (r_type == R_390_TLS_LE64)
2682 {
2683 /* This relocation gets optimized away by the local exec
2684 access optimization. */
2685 BFD_ASSERT (! unresolved_reloc);
2686 bfd_put_64 (output_bfd, -tpoff (info, relocation),
2687 contents + rel->r_offset);
2688 continue;
2689 }
2690
2691 if (htab->sgot == NULL)
2692 abort ();
2693
2694 if (h != NULL)
2695 off = h->got.offset;
2696 else
2697 {
2698 if (local_got_offsets == NULL)
2699 abort ();
2700
2701 off = local_got_offsets[r_symndx];
2702 }
2703
2704 emit_tls_relocs:
2705
2706 if ((off & 1) != 0)
2707 off &= ~1;
2708 else
2709 {
2710 Elf_Internal_Rela outrel;
2711 bfd_byte *loc;
2712 int dr_type, indx;
2713
2714 if (htab->srelgot == NULL)
2715 abort ();
2716
2717 outrel.r_offset = (htab->sgot->output_section->vma
2718 + htab->sgot->output_offset + off);
2719
2720 indx = h && h->dynindx != -1 ? h->dynindx : 0;
2721 if (r_type == R_390_TLS_GD64)
2722 dr_type = R_390_TLS_DTPMOD;
2723 else
2724 dr_type = R_390_TLS_TPOFF;
2725 if (dr_type == R_390_TLS_TPOFF && indx == 0)
2726 outrel.r_addend = relocation - dtpoff_base (info);
2727 else
2728 outrel.r_addend = 0;
2729 outrel.r_info = ELF64_R_INFO (indx, dr_type);
2730 loc = htab->srelgot->contents;
2731 loc += htab->srelgot->reloc_count++
2732 * sizeof (Elf64_External_Rela);
2733 bfd_elf64_swap_reloca_out (output_bfd, &outrel, loc);
2734
2735 if (r_type == R_390_TLS_GD64)
2736 {
2737 if (indx == 0)
2738 {
2739 BFD_ASSERT (! unresolved_reloc);
2740 bfd_put_64 (output_bfd,
2741 relocation - dtpoff_base (info),
2742 htab->sgot->contents + off + GOT_ENTRY_SIZE);
2743 }
2744 else
2745 {
2746 outrel.r_info = ELF64_R_INFO (indx, R_390_TLS_DTPOFF);
2747 outrel.r_offset += GOT_ENTRY_SIZE;
2748 outrel.r_addend = 0;
2749 htab->srelgot->reloc_count++;
2750 loc += sizeof (Elf64_External_Rela);
2751 bfd_elf64_swap_reloca_out (output_bfd, &outrel, loc);
2752 }
2753 }
2754
2755 if (h != NULL)
2756 h->got.offset |= 1;
2757 else
2758 local_got_offsets[r_symndx] |= 1;
2759 }
2760
2761 if (off >= (bfd_vma) -2)
2762 abort ();
2763 if (r_type == ELF64_R_TYPE (rel->r_info))
2764 {
2765 relocation = htab->sgot->output_offset + off;
2766 if (r_type == R_390_TLS_IE64 || r_type == R_390_TLS_IEENT)
2767 relocation += htab->sgot->output_section->vma;
2768 unresolved_reloc = FALSE;
2769 }
2770 else
2771 {
2772 bfd_put_64 (output_bfd, htab->sgot->output_offset + off,
2773 contents + rel->r_offset);
2774 continue;
2775 }
2776 break;
2777
2778 case R_390_TLS_GOTIE12:
2779 case R_390_TLS_GOTIE20:
2780 case R_390_TLS_IEENT:
2781 if (h == NULL)
2782 {
2783 if (local_got_offsets == NULL)
2784 abort();
2785 off = local_got_offsets[r_symndx];
2786 if (info->shared)
2787 goto emit_tls_relocs;
2788 }
2789 else
2790 {
2791 off = h->got.offset;
2792 tls_type = elf_s390_hash_entry(h)->tls_type;
2793 if (info->shared || h->dynindx != -1 || tls_type < GOT_TLS_IE)
2794 goto emit_tls_relocs;
2795 }
2796
2797 if (htab->sgot == NULL)
2798 abort ();
2799
2800 BFD_ASSERT (! unresolved_reloc);
2801 bfd_put_64 (output_bfd, -tpoff (info, relocation),
2802 htab->sgot->contents + off);
2803 relocation = htab->sgot->output_offset + off;
2804 if (r_type == R_390_TLS_IEENT)
2805 relocation += htab->sgot->output_section->vma;
2806 unresolved_reloc = FALSE;
2807 break;
2808
2809 case R_390_TLS_LDM64:
2810 if (! info->shared)
2811 /* The literal pool entry this relocation refers to gets ignored
2812 by the optimized code of the local exec model. Do nothing
2813 and the value will turn out zero. */
2814 continue;
2815
2816 if (htab->sgot == NULL)
2817 abort ();
2818
2819 off = htab->tls_ldm_got.offset;
2820 if (off & 1)
2821 off &= ~1;
2822 else
2823 {
2824 Elf_Internal_Rela outrel;
2825 bfd_byte *loc;
2826
2827 if (htab->srelgot == NULL)
2828 abort ();
2829
2830 outrel.r_offset = (htab->sgot->output_section->vma
2831 + htab->sgot->output_offset + off);
2832
2833 bfd_put_64 (output_bfd, 0,
2834 htab->sgot->contents + off + GOT_ENTRY_SIZE);
2835 outrel.r_info = ELF64_R_INFO (0, R_390_TLS_DTPMOD);
2836 outrel.r_addend = 0;
2837 loc = htab->srelgot->contents;
2838 loc += htab->srelgot->reloc_count++
2839 * sizeof (Elf64_External_Rela);
2840 bfd_elf64_swap_reloca_out (output_bfd, &outrel, loc);
2841 htab->tls_ldm_got.offset |= 1;
2842 }
2843 relocation = htab->sgot->output_offset + off;
2844 unresolved_reloc = FALSE;
2845 break;
2846
2847 case R_390_TLS_LE64:
2848 if (info->shared)
2849 {
2850 /* Linking a shared library with non-fpic code requires
2851 a R_390_TLS_TPOFF relocation. */
2852 Elf_Internal_Rela outrel;
2853 asection *sreloc;
2854 bfd_byte *loc;
2855 int indx;
2856
2857 outrel.r_offset = rel->r_offset
2858 + input_section->output_section->vma
2859 + input_section->output_offset;
2860 if (h != NULL && h->dynindx != -1)
2861 indx = h->dynindx;
2862 else
2863 indx = 0;
2864 outrel.r_info = ELF64_R_INFO (indx, R_390_TLS_TPOFF);
2865 if (indx == 0)
2866 outrel.r_addend = relocation - dtpoff_base (info);
2867 else
2868 outrel.r_addend = 0;
2869 sreloc = elf_section_data (input_section)->sreloc;
2870 if (sreloc == NULL)
2871 abort ();
2872 loc = sreloc->contents;
2873 loc += sreloc->reloc_count++ * sizeof (Elf64_External_Rela);
2874 bfd_elf64_swap_reloca_out (output_bfd, &outrel, loc);
2875 }
2876 else
2877 {
2878 BFD_ASSERT (! unresolved_reloc);
2879 bfd_put_64 (output_bfd, -tpoff (info, relocation),
2880 contents + rel->r_offset);
2881 }
2882 continue;
2883
2884 case R_390_TLS_LDO64:
2885 if (info->shared || (input_section->flags & SEC_CODE) == 0)
2886 relocation -= dtpoff_base (info);
2887 else
2888 /* When converting LDO to LE, we must negate. */
2889 relocation = -tpoff (info, relocation);
2890 break;
2891
2892 /* Relocations for tls instructions. */
2893 case R_390_TLS_LOAD:
2894 case R_390_TLS_GDCALL:
2895 case R_390_TLS_LDCALL:
2896 tls_type = GOT_UNKNOWN;
2897 if (h == NULL && local_got_offsets)
2898 tls_type = elf_s390_local_got_tls_type (input_bfd) [r_symndx];
2899 else if (h != NULL)
2900 tls_type = elf_s390_hash_entry(h)->tls_type;
2901
2902 if (tls_type == GOT_TLS_GD)
2903 continue;
2904
2905 if (r_type == R_390_TLS_LOAD)
2906 {
2907 if (!info->shared && (h == NULL || h->dynindx == -1))
2908 {
2909 /* IE->LE transition. Four valid cases:
2910 lg %rx,(0,%ry) -> sllg %rx,%ry,0
2911 lg %rx,(%ry,0) -> sllg %rx,%ry,0
2912 lg %rx,(%ry,%r12) -> sllg %rx,%ry,0
2913 lg %rx,(%r12,%ry) -> sllg %rx,%ry,0 */
2914 unsigned int insn0, insn1, ry;
2915
2916 insn0 = bfd_get_32 (input_bfd, contents + rel->r_offset);
2917 insn1 = bfd_get_16 (input_bfd, contents + rel->r_offset + 4);
2918 if (insn1 != 0x0004)
2919 invalid_tls_insn (input_bfd, input_section, rel);
2920 ry = 0;
2921 if ((insn0 & 0xff00f000) == 0xe3000000)
2922 /* lg %rx,0(%ry,0) -> sllg %rx,%ry,0 */
2923 ry = (insn0 & 0x000f0000);
2924 else if ((insn0 & 0xff0f0000) == 0xe3000000)
2925 /* lg %rx,0(0,%ry) -> sllg %rx,%ry,0 */
2926 ry = (insn0 & 0x0000f000) << 4;
2927 else if ((insn0 & 0xff00f000) == 0xe300c000)
2928 /* lg %rx,0(%ry,%r12) -> sllg %rx,%ry,0 */
2929 ry = (insn0 & 0x000f0000);
2930 else if ((insn0 & 0xff0f0000) == 0xe30c0000)
2931 /* lg %rx,0(%r12,%ry) -> sllg %rx,%ry,0 */
2932 ry = (insn0 & 0x0000f000) << 4;
2933 else
2934 invalid_tls_insn (input_bfd, input_section, rel);
2935 insn0 = 0xeb000000 | (insn0 & 0x00f00000) | ry;
2936 insn1 = 0x000d;
2937 bfd_put_32 (output_bfd, insn0, contents + rel->r_offset);
2938 bfd_put_16 (output_bfd, insn1, contents + rel->r_offset + 4);
2939 }
2940 }
2941 else if (r_type == R_390_TLS_GDCALL)
2942 {
2943 unsigned int insn0, insn1;
2944
2945 insn0 = bfd_get_32 (input_bfd, contents + rel->r_offset);
2946 insn1 = bfd_get_16 (input_bfd, contents + rel->r_offset + 4);
2947 if ((insn0 & 0xffff0000) != 0xc0e50000)
2948 invalid_tls_insn (input_bfd, input_section, rel);
2949 if (!info->shared && (h == NULL || h->dynindx == -1))
2950 {
2951 /* GD->LE transition.
2952 brasl %r14,__tls_get_addr@plt -> brcl 0,. */
2953 insn0 = 0xc0040000;
2954 insn1 = 0x0000;
2955 }
2956 else
2957 {
2958 /* GD->IE transition.
2959 brasl %r14,__tls_get_addr@plt -> lg %r2,0(%r2,%r12) */
2960 insn0 = 0xe322c000;
2961 insn1 = 0x0004;
2962 }
2963 bfd_put_32 (output_bfd, insn0, contents + rel->r_offset);
2964 bfd_put_16 (output_bfd, insn1, contents + rel->r_offset + 4);
2965 }
2966 else if (r_type == R_390_TLS_LDCALL)
2967 {
2968 if (!info->shared)
2969 {
2970 unsigned int insn0, insn1;
2971
2972 insn0 = bfd_get_32 (input_bfd, contents + rel->r_offset);
2973 insn1 = bfd_get_16 (input_bfd, contents + rel->r_offset + 4);
2974 if ((insn0 & 0xffff0000) != 0xc0e50000)
2975 invalid_tls_insn (input_bfd, input_section, rel);
2976 /* LD->LE transition.
2977 brasl %r14,__tls_get_addr@plt -> brcl 0,. */
2978 insn0 = 0xc0040000;
2979 insn1 = 0x0000;
2980 bfd_put_32 (output_bfd, insn0, contents + rel->r_offset);
2981 bfd_put_16 (output_bfd, insn1, contents + rel->r_offset + 4);
2982 }
2983 }
2984 continue;
2985
2986 default:
2987 break;
2988 }
2989
2990 /* Dynamic relocs are not propagated for SEC_DEBUGGING sections
2991 because such sections are not SEC_ALLOC and thus ld.so will
2992 not process them. */
2993 if (unresolved_reloc
2994 && !((input_section->flags & SEC_DEBUGGING) != 0
2995 && h->def_dynamic))
2996 (*_bfd_error_handler)
2997 (_("%B(%A+0x%lx): unresolvable relocation against symbol `%s'"),
2998 input_bfd,
2999 input_section,
3000 (long) rel->r_offset,
3001 h->root.root.string);
3002
3003 if (r_type == R_390_20
3004 || r_type == R_390_GOT20
3005 || r_type == R_390_GOTPLT20
3006 || r_type == R_390_TLS_GOTIE20)
3007 {
3008 relocation += rel->r_addend;
3009 relocation = (relocation&0xfff) << 8 | (relocation&0xff000) >> 12;
3010 r = _bfd_final_link_relocate (howto, input_bfd, input_section,
3011 contents, rel->r_offset,
3012 relocation, 0);
3013 }
3014 else
3015 r = _bfd_final_link_relocate (howto, input_bfd, input_section,
3016 contents, rel->r_offset,
3017 relocation, rel->r_addend);
3018
3019 if (r != bfd_reloc_ok)
3020 {
3021 const char *name;
3022
3023 if (h != NULL)
3024 name = h->root.root.string;
3025 else
3026 {
3027 name = bfd_elf_string_from_elf_section (input_bfd,
3028 symtab_hdr->sh_link,
3029 sym->st_name);
3030 if (name == NULL)
3031 return FALSE;
3032 if (*name == '\0')
3033 name = bfd_section_name (input_bfd, sec);
3034 }
3035
3036 if (r == bfd_reloc_overflow)
3037 {
3038
3039 if (! ((*info->callbacks->reloc_overflow)
3040 (info, (h ? &h->root : NULL), name, howto->name,
3041 (bfd_vma) 0, input_bfd, input_section,
3042 rel->r_offset)))
3043 return FALSE;
3044 }
3045 else
3046 {
3047 (*_bfd_error_handler)
3048 (_("%B(%A+0x%lx): reloc against `%s': error %d"),
3049 input_bfd, input_section,
3050 (long) rel->r_offset, name, (int) r);
3051 return FALSE;
3052 }
3053 }
3054 }
3055
3056 return TRUE;
3057 }
3058
3059 /* Finish up dynamic symbol handling. We set the contents of various
3060 dynamic sections here. */
3061
3062 static bfd_boolean
3063 elf_s390_finish_dynamic_symbol (output_bfd, info, h, sym)
3064 bfd *output_bfd;
3065 struct bfd_link_info *info;
3066 struct elf_link_hash_entry *h;
3067 Elf_Internal_Sym *sym;
3068 {
3069 struct elf_s390_link_hash_table *htab;
3070
3071 htab = elf_s390_hash_table (info);
3072
3073 if (h->plt.offset != (bfd_vma) -1)
3074 {
3075 bfd_vma plt_index;
3076 bfd_vma got_offset;
3077 Elf_Internal_Rela rela;
3078 bfd_byte *loc;
3079
3080 /* This symbol has an entry in the procedure linkage table. Set
3081 it up. */
3082
3083 if (h->dynindx == -1
3084 || htab->splt == NULL
3085 || htab->sgotplt == NULL
3086 || htab->srelplt == NULL)
3087 abort ();
3088
3089 /* Calc. index no.
3090 Current offset - size first entry / entry size. */
3091 plt_index = (h->plt.offset - PLT_FIRST_ENTRY_SIZE) / PLT_ENTRY_SIZE;
3092
3093 /* Offset in GOT is PLT index plus GOT headers(3) times 8,
3094 addr & GOT addr. */
3095 got_offset = (plt_index + 3) * GOT_ENTRY_SIZE;
3096
3097 /* Fill in the blueprint of a PLT. */
3098 bfd_put_32 (output_bfd, (bfd_vma) PLT_ENTRY_WORD0,
3099 htab->splt->contents + h->plt.offset);
3100 bfd_put_32 (output_bfd, (bfd_vma) PLT_ENTRY_WORD1,
3101 htab->splt->contents + h->plt.offset + 4);
3102 bfd_put_32 (output_bfd, (bfd_vma) PLT_ENTRY_WORD2,
3103 htab->splt->contents + h->plt.offset + 8);
3104 bfd_put_32 (output_bfd, (bfd_vma) PLT_ENTRY_WORD3,
3105 htab->splt->contents + h->plt.offset + 12);
3106 bfd_put_32 (output_bfd, (bfd_vma) PLT_ENTRY_WORD4,
3107 htab->splt->contents + h->plt.offset + 16);
3108 bfd_put_32 (output_bfd, (bfd_vma) PLT_ENTRY_WORD5,
3109 htab->splt->contents + h->plt.offset + 20);
3110 bfd_put_32 (output_bfd, (bfd_vma) PLT_ENTRY_WORD6,
3111 htab->splt->contents + h->plt.offset + 24);
3112 bfd_put_32 (output_bfd, (bfd_vma) PLT_ENTRY_WORD7,
3113 htab->splt->contents + h->plt.offset + 28);
3114 /* Fixup the relative address to the GOT entry */
3115 bfd_put_32 (output_bfd,
3116 (htab->sgotplt->output_section->vma +
3117 htab->sgotplt->output_offset + got_offset
3118 - (htab->splt->output_section->vma + h->plt.offset))/2,
3119 htab->splt->contents + h->plt.offset + 2);
3120 /* Fixup the relative branch to PLT 0 */
3121 bfd_put_32 (output_bfd, - (PLT_FIRST_ENTRY_SIZE +
3122 (PLT_ENTRY_SIZE * plt_index) + 22)/2,
3123 htab->splt->contents + h->plt.offset + 24);
3124 /* Fixup offset into symbol table */
3125 bfd_put_32 (output_bfd, plt_index * sizeof (Elf64_External_Rela),
3126 htab->splt->contents + h->plt.offset + 28);
3127
3128 /* Fill in the entry in the global offset table.
3129 Points to instruction after GOT offset. */
3130 bfd_put_64 (output_bfd,
3131 (htab->splt->output_section->vma
3132 + htab->splt->output_offset
3133 + h->plt.offset
3134 + 14),
3135 htab->sgotplt->contents + got_offset);
3136
3137 /* Fill in the entry in the .rela.plt section. */
3138 rela.r_offset = (htab->sgotplt->output_section->vma
3139 + htab->sgotplt->output_offset
3140 + got_offset);
3141 rela.r_info = ELF64_R_INFO (h->dynindx, R_390_JMP_SLOT);
3142 rela.r_addend = 0;
3143 loc = htab->srelplt->contents + plt_index * sizeof (Elf64_External_Rela);
3144 bfd_elf64_swap_reloca_out (output_bfd, &rela, loc);
3145
3146 if (!h->def_regular)
3147 {
3148 /* Mark the symbol as undefined, rather than as defined in
3149 the .plt section. Leave the value alone. This is a clue
3150 for the dynamic linker, to make function pointer
3151 comparisons work between an application and shared
3152 library. */
3153 sym->st_shndx = SHN_UNDEF;
3154 }
3155 }
3156
3157 if (h->got.offset != (bfd_vma) -1
3158 && elf_s390_hash_entry(h)->tls_type != GOT_TLS_GD
3159 && elf_s390_hash_entry(h)->tls_type != GOT_TLS_IE
3160 && elf_s390_hash_entry(h)->tls_type != GOT_TLS_IE_NLT)
3161 {
3162 Elf_Internal_Rela rela;
3163 bfd_byte *loc;
3164
3165 /* This symbol has an entry in the global offset table. Set it
3166 up. */
3167 if (htab->sgot == NULL || htab->srelgot == NULL)
3168 abort ();
3169
3170 rela.r_offset = (htab->sgot->output_section->vma
3171 + htab->sgot->output_offset
3172 + (h->got.offset &~ (bfd_vma) 1));
3173
3174 /* If this is a static link, or it is a -Bsymbolic link and the
3175 symbol is defined locally or was forced to be local because
3176 of a version file, we just want to emit a RELATIVE reloc.
3177 The entry in the global offset table will already have been
3178 initialized in the relocate_section function. */
3179 if (info->shared
3180 && (info->symbolic
3181 || h->dynindx == -1
3182 || h->forced_local)
3183 && h->def_regular)
3184 {
3185 BFD_ASSERT((h->got.offset & 1) != 0);
3186 rela.r_info = ELF64_R_INFO (0, R_390_RELATIVE);
3187 rela.r_addend = (h->root.u.def.value
3188 + h->root.u.def.section->output_section->vma
3189 + h->root.u.def.section->output_offset);
3190 }
3191 else
3192 {
3193 BFD_ASSERT((h->got.offset & 1) == 0);
3194 bfd_put_64 (output_bfd, (bfd_vma) 0, htab->sgot->contents + h->got.offset);
3195 rela.r_info = ELF64_R_INFO (h->dynindx, R_390_GLOB_DAT);
3196 rela.r_addend = 0;
3197 }
3198
3199 loc = htab->srelgot->contents;
3200 loc += htab->srelgot->reloc_count++ * sizeof (Elf64_External_Rela);
3201 bfd_elf64_swap_reloca_out (output_bfd, &rela, loc);
3202 }
3203
3204 if (h->needs_copy)
3205 {
3206 Elf_Internal_Rela rela;
3207 bfd_byte *loc;
3208
3209 /* This symbols needs a copy reloc. Set it up. */
3210
3211 if (h->dynindx == -1
3212 || (h->root.type != bfd_link_hash_defined
3213 && h->root.type != bfd_link_hash_defweak)
3214 || htab->srelbss == NULL)
3215 abort ();
3216
3217 rela.r_offset = (h->root.u.def.value
3218 + h->root.u.def.section->output_section->vma
3219 + h->root.u.def.section->output_offset);
3220 rela.r_info = ELF64_R_INFO (h->dynindx, R_390_COPY);
3221 rela.r_addend = 0;
3222 loc = htab->srelbss->contents;
3223 loc += htab->srelbss->reloc_count++ * sizeof (Elf64_External_Rela);
3224 bfd_elf64_swap_reloca_out (output_bfd, &rela, loc);
3225 }
3226
3227 /* Mark some specially defined symbols as absolute. */
3228 if (strcmp (h->root.root.string, "_DYNAMIC") == 0
3229 || strcmp (h->root.root.string, "_GLOBAL_OFFSET_TABLE_") == 0
3230 || strcmp (h->root.root.string, "_PROCEDURE_LINKAGE_TABLE_") == 0)
3231 sym->st_shndx = SHN_ABS;
3232
3233 return TRUE;
3234 }
3235
3236 /* Used to decide how to sort relocs in an optimal manner for the
3237 dynamic linker, before writing them out. */
3238
3239 static enum elf_reloc_type_class
3240 elf_s390_reloc_type_class (rela)
3241 const Elf_Internal_Rela *rela;
3242 {
3243 switch ((int) ELF64_R_TYPE (rela->r_info))
3244 {
3245 case R_390_RELATIVE:
3246 return reloc_class_relative;
3247 case R_390_JMP_SLOT:
3248 return reloc_class_plt;
3249 case R_390_COPY:
3250 return reloc_class_copy;
3251 default:
3252 return reloc_class_normal;
3253 }
3254 }
3255
3256 /* Finish up the dynamic sections. */
3257
3258 static bfd_boolean
3259 elf_s390_finish_dynamic_sections (output_bfd, info)
3260 bfd *output_bfd;
3261 struct bfd_link_info *info;
3262 {
3263 struct elf_s390_link_hash_table *htab;
3264 bfd *dynobj;
3265 asection *sdyn;
3266
3267 htab = elf_s390_hash_table (info);
3268 dynobj = htab->elf.dynobj;
3269 sdyn = bfd_get_section_by_name (dynobj, ".dynamic");
3270
3271 if (htab->elf.dynamic_sections_created)
3272 {
3273 Elf64_External_Dyn *dyncon, *dynconend;
3274
3275 if (sdyn == NULL || htab->sgot == NULL)
3276 abort ();
3277
3278 dyncon = (Elf64_External_Dyn *) sdyn->contents;
3279 dynconend = (Elf64_External_Dyn *) (sdyn->contents + sdyn->size);
3280 for (; dyncon < dynconend; dyncon++)
3281 {
3282 Elf_Internal_Dyn dyn;
3283 asection *s;
3284
3285 bfd_elf64_swap_dyn_in (dynobj, dyncon, &dyn);
3286
3287 switch (dyn.d_tag)
3288 {
3289 default:
3290 continue;
3291
3292 case DT_PLTGOT:
3293 dyn.d_un.d_ptr = htab->sgot->output_section->vma;
3294 break;
3295
3296 case DT_JMPREL:
3297 dyn.d_un.d_ptr = htab->srelplt->output_section->vma;
3298 break;
3299
3300 case DT_PLTRELSZ:
3301 s = htab->srelplt->output_section;
3302 dyn.d_un.d_val = s->size;
3303 break;
3304
3305 case DT_RELASZ:
3306 /* The procedure linkage table relocs (DT_JMPREL) should
3307 not be included in the overall relocs (DT_RELA).
3308 Therefore, we override the DT_RELASZ entry here to
3309 make it not include the JMPREL relocs. Since the
3310 linker script arranges for .rela.plt to follow all
3311 other relocation sections, we don't have to worry
3312 about changing the DT_RELA entry. */
3313 s = htab->srelplt->output_section;
3314 dyn.d_un.d_val -= s->size;
3315 break;
3316 }
3317
3318 bfd_elf64_swap_dyn_out (output_bfd, &dyn, dyncon);
3319 }
3320
3321 /* Fill in the special first entry in the procedure linkage table. */
3322 if (htab->splt && htab->splt->size > 0)
3323 {
3324 /* fill in blueprint for plt 0 entry */
3325 bfd_put_32 (output_bfd, (bfd_vma) PLT_FIRST_ENTRY_WORD0,
3326 htab->splt->contents );
3327 bfd_put_32 (output_bfd, (bfd_vma) PLT_FIRST_ENTRY_WORD1,
3328 htab->splt->contents +4 );
3329 bfd_put_32 (output_bfd, (bfd_vma) PLT_FIRST_ENTRY_WORD3,
3330 htab->splt->contents +12 );
3331 bfd_put_32 (output_bfd, (bfd_vma) PLT_FIRST_ENTRY_WORD4,
3332 htab->splt->contents +16 );
3333 bfd_put_32 (output_bfd, (bfd_vma) PLT_FIRST_ENTRY_WORD5,
3334 htab->splt->contents +20 );
3335 bfd_put_32 (output_bfd, (bfd_vma) PLT_FIRST_ENTRY_WORD6,
3336 htab->splt->contents + 24);
3337 bfd_put_32 (output_bfd, (bfd_vma) PLT_FIRST_ENTRY_WORD7,
3338 htab->splt->contents + 28 );
3339 /* Fixup relative address to start of GOT */
3340 bfd_put_32 (output_bfd,
3341 (htab->sgotplt->output_section->vma +
3342 htab->sgotplt->output_offset
3343 - htab->splt->output_section->vma - 6)/2,
3344 htab->splt->contents + 8);
3345 }
3346 elf_section_data (htab->splt->output_section)
3347 ->this_hdr.sh_entsize = PLT_ENTRY_SIZE;
3348 }
3349
3350 if (htab->sgotplt)
3351 {
3352 /* Fill in the first three entries in the global offset table. */
3353 if (htab->sgotplt->size > 0)
3354 {
3355 bfd_put_64 (output_bfd,
3356 (sdyn == NULL ? (bfd_vma) 0
3357 : sdyn->output_section->vma + sdyn->output_offset),
3358 htab->sgotplt->contents);
3359 /* One entry for shared object struct ptr. */
3360 bfd_put_64 (output_bfd, (bfd_vma) 0, htab->sgotplt->contents + 8);
3361 /* One entry for _dl_runtime_resolve. */
3362 bfd_put_64 (output_bfd, (bfd_vma) 0, htab->sgotplt->contents + 12);
3363 }
3364
3365 elf_section_data (htab->sgot->output_section)
3366 ->this_hdr.sh_entsize = 8;
3367 }
3368 return TRUE;
3369 }
3370
3371 /* Return address for Ith PLT stub in section PLT, for relocation REL
3372 or (bfd_vma) -1 if it should not be included. */
3373
3374 static bfd_vma
3375 elf_s390_plt_sym_val (bfd_vma i, const asection *plt,
3376 const arelent *rel ATTRIBUTE_UNUSED)
3377 {
3378 return plt->vma + PLT_FIRST_ENTRY_SIZE + i * PLT_ENTRY_SIZE;
3379 }
3380
3381
3382 /* Why was the hash table entry size definition changed from
3383 ARCH_SIZE/8 to 4? This breaks the 64 bit dynamic linker and
3384 this is the only reason for the s390_elf64_size_info structure. */
3385
3386 const struct elf_size_info s390_elf64_size_info =
3387 {
3388 sizeof (Elf64_External_Ehdr),
3389 sizeof (Elf64_External_Phdr),
3390 sizeof (Elf64_External_Shdr),
3391 sizeof (Elf64_External_Rel),
3392 sizeof (Elf64_External_Rela),
3393 sizeof (Elf64_External_Sym),
3394 sizeof (Elf64_External_Dyn),
3395 sizeof (Elf_External_Note),
3396 8, /* hash-table entry size. */
3397 1, /* internal relocations per external relocations. */
3398 64, /* arch_size. */
3399 3, /* log_file_align. */
3400 ELFCLASS64, EV_CURRENT,
3401 bfd_elf64_write_out_phdrs,
3402 bfd_elf64_write_shdrs_and_ehdr,
3403 bfd_elf64_write_relocs,
3404 bfd_elf64_swap_symbol_in,
3405 bfd_elf64_swap_symbol_out,
3406 bfd_elf64_slurp_reloc_table,
3407 bfd_elf64_slurp_symbol_table,
3408 bfd_elf64_swap_dyn_in,
3409 bfd_elf64_swap_dyn_out,
3410 bfd_elf64_swap_reloc_in,
3411 bfd_elf64_swap_reloc_out,
3412 bfd_elf64_swap_reloca_in,
3413 bfd_elf64_swap_reloca_out
3414 };
3415
3416 #define TARGET_BIG_SYM bfd_elf64_s390_vec
3417 #define TARGET_BIG_NAME "elf64-s390"
3418 #define ELF_ARCH bfd_arch_s390
3419 #define ELF_MACHINE_CODE EM_S390
3420 #define ELF_MACHINE_ALT1 EM_S390_OLD
3421 #define ELF_MAXPAGESIZE 0x1000
3422
3423 #define elf_backend_size_info s390_elf64_size_info
3424
3425 #define elf_backend_can_gc_sections 1
3426 #define elf_backend_can_refcount 1
3427 #define elf_backend_want_got_plt 1
3428 #define elf_backend_plt_readonly 1
3429 #define elf_backend_want_plt_sym 0
3430 #define elf_backend_got_header_size 24
3431 #define elf_backend_rela_normal 1
3432
3433 #define elf_info_to_howto elf_s390_info_to_howto
3434
3435 #define bfd_elf64_bfd_is_local_label_name elf_s390_is_local_label_name
3436 #define bfd_elf64_bfd_link_hash_table_create elf_s390_link_hash_table_create
3437 #define bfd_elf64_bfd_reloc_type_lookup elf_s390_reloc_type_lookup
3438
3439 #define elf_backend_adjust_dynamic_symbol elf_s390_adjust_dynamic_symbol
3440 #define elf_backend_check_relocs elf_s390_check_relocs
3441 #define elf_backend_copy_indirect_symbol elf_s390_copy_indirect_symbol
3442 #define elf_backend_create_dynamic_sections elf_s390_create_dynamic_sections
3443 #define elf_backend_finish_dynamic_sections elf_s390_finish_dynamic_sections
3444 #define elf_backend_finish_dynamic_symbol elf_s390_finish_dynamic_symbol
3445 #define elf_backend_gc_mark_hook elf_s390_gc_mark_hook
3446 #define elf_backend_gc_sweep_hook elf_s390_gc_sweep_hook
3447 #define elf_backend_reloc_type_class elf_s390_reloc_type_class
3448 #define elf_backend_relocate_section elf_s390_relocate_section
3449 #define elf_backend_size_dynamic_sections elf_s390_size_dynamic_sections
3450 #define elf_backend_reloc_type_class elf_s390_reloc_type_class
3451 #define elf_backend_plt_sym_val elf_s390_plt_sym_val
3452
3453 #define bfd_elf64_mkobject elf_s390_mkobject
3454 #define elf_backend_object_p elf_s390_object_p
3455
3456 #include "elf64-target.h"