Commit | Line | Data |
---|---|---|
252b5132 | 1 | /* Intel 80386/80486-specific support for 32-bit ELF |
7898deda | 2 | Copyright 1993, 1994, 1995, 1996, 1997, 1998, 1999, 2000, 2001 |
638632bd | 3 | Free Software Foundation, Inc. |
252b5132 RH |
4 | |
5 | This file is part of BFD, the Binary File Descriptor library. | |
6 | ||
7 | This program is free software; you can redistribute it and/or modify | |
8 | it under the terms of the GNU General Public License as published by | |
9 | the Free Software Foundation; either version 2 of the License, or | |
10 | (at your option) any later version. | |
11 | ||
12 | This program is distributed in the hope that it will be useful, | |
13 | but WITHOUT ANY WARRANTY; without even the implied warranty of | |
14 | MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the | |
15 | GNU General Public License for more details. | |
16 | ||
17 | You should have received a copy of the GNU General Public License | |
18 | along with this program; if not, write to the Free Software | |
19 | Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA. */ | |
20 | ||
21 | #include "bfd.h" | |
22 | #include "sysdep.h" | |
23 | #include "bfdlink.h" | |
24 | #include "libbfd.h" | |
25 | #include "elf-bfd.h" | |
26 | ||
27 | static reloc_howto_type *elf_i386_reloc_type_lookup | |
28 | PARAMS ((bfd *, bfd_reloc_code_real_type)); | |
29 | static void elf_i386_info_to_howto | |
30 | PARAMS ((bfd *, arelent *, Elf32_Internal_Rela *)); | |
31 | static void elf_i386_info_to_howto_rel | |
32 | PARAMS ((bfd *, arelent *, Elf32_Internal_Rel *)); | |
33 | static boolean elf_i386_is_local_label_name PARAMS ((bfd *, const char *)); | |
34 | static struct bfd_hash_entry *elf_i386_link_hash_newfunc | |
35 | PARAMS ((struct bfd_hash_entry *, struct bfd_hash_table *, const char *)); | |
36 | static struct bfd_link_hash_table *elf_i386_link_hash_table_create | |
37 | PARAMS ((bfd *)); | |
6725bdbf AM |
38 | static boolean create_got_section PARAMS((bfd *, struct bfd_link_info *)); |
39 | static boolean elf_i386_create_dynamic_sections | |
40 | PARAMS((bfd *, struct bfd_link_info *)); | |
252b5132 RH |
41 | static boolean elf_i386_check_relocs |
42 | PARAMS ((bfd *, struct bfd_link_info *, asection *, | |
43 | const Elf_Internal_Rela *)); | |
a7b97311 AM |
44 | static asection *elf_i386_gc_mark_hook |
45 | PARAMS ((bfd *, struct bfd_link_info *, Elf_Internal_Rela *, | |
46 | struct elf_link_hash_entry *, Elf_Internal_Sym *)); | |
47 | static boolean elf_i386_gc_sweep_hook | |
48 | PARAMS ((bfd *, struct bfd_link_info *, asection *, | |
49 | const Elf_Internal_Rela *)); | |
252b5132 RH |
50 | static boolean elf_i386_adjust_dynamic_symbol |
51 | PARAMS ((struct bfd_link_info *, struct elf_link_hash_entry *)); | |
0c715baa AM |
52 | static boolean allocate_dynrelocs |
53 | PARAMS ((struct elf_link_hash_entry *, PTR)); | |
54 | static boolean readonly_dynrelocs | |
6725bdbf | 55 | PARAMS ((struct elf_link_hash_entry *, PTR)); |
252b5132 RH |
56 | static boolean elf_i386_size_dynamic_sections |
57 | PARAMS ((bfd *, struct bfd_link_info *)); | |
58 | static boolean elf_i386_relocate_section | |
59 | PARAMS ((bfd *, struct bfd_link_info *, bfd *, asection *, bfd_byte *, | |
60 | Elf_Internal_Rela *, Elf_Internal_Sym *, asection **)); | |
61 | static boolean elf_i386_finish_dynamic_symbol | |
62 | PARAMS ((bfd *, struct bfd_link_info *, struct elf_link_hash_entry *, | |
63 | Elf_Internal_Sym *)); | |
64 | static boolean elf_i386_finish_dynamic_sections | |
65 | PARAMS ((bfd *, struct bfd_link_info *)); | |
a7b97311 AM |
66 | static boolean elf_i386_fake_sections |
67 | PARAMS ((bfd *, Elf32_Internal_Shdr *, asection *)); | |
f51e552e AM |
68 | static enum elf_reloc_type_class elf_i386_reloc_type_class |
69 | PARAMS ((const Elf_Internal_Rela *)); | |
2e67030c DJ |
70 | static boolean elf_i386_grok_prstatus |
71 | PARAMS ((bfd *abfd, Elf_Internal_Note *note)); | |
72 | static boolean elf_i386_grok_psinfo | |
73 | PARAMS ((bfd *abfd, Elf_Internal_Note *note)); | |
252b5132 RH |
74 | |
75 | #define USE_REL 1 /* 386 uses REL relocations instead of RELA */ | |
76 | ||
77 | #include "elf/i386.h" | |
78 | ||
79 | static reloc_howto_type elf_howto_table[]= | |
80 | { | |
1b452ec6 AM |
81 | HOWTO(R_386_NONE, 0, 0, 0, false, 0, complain_overflow_bitfield, |
82 | bfd_elf_generic_reloc, "R_386_NONE", | |
83 | true, 0x00000000, 0x00000000, false), | |
84 | HOWTO(R_386_32, 0, 2, 32, false, 0, complain_overflow_bitfield, | |
85 | bfd_elf_generic_reloc, "R_386_32", | |
86 | true, 0xffffffff, 0xffffffff, false), | |
87 | HOWTO(R_386_PC32, 0, 2, 32, true, 0, complain_overflow_bitfield, | |
88 | bfd_elf_generic_reloc, "R_386_PC32", | |
89 | true, 0xffffffff, 0xffffffff, true), | |
90 | HOWTO(R_386_GOT32, 0, 2, 32, false, 0, complain_overflow_bitfield, | |
91 | bfd_elf_generic_reloc, "R_386_GOT32", | |
92 | true, 0xffffffff, 0xffffffff, false), | |
93 | HOWTO(R_386_PLT32, 0, 2, 32, true, 0, complain_overflow_bitfield, | |
94 | bfd_elf_generic_reloc, "R_386_PLT32", | |
95 | true, 0xffffffff, 0xffffffff, true), | |
96 | HOWTO(R_386_COPY, 0, 2, 32, false, 0, complain_overflow_bitfield, | |
97 | bfd_elf_generic_reloc, "R_386_COPY", | |
98 | true, 0xffffffff, 0xffffffff, false), | |
99 | HOWTO(R_386_GLOB_DAT, 0, 2, 32, false, 0, complain_overflow_bitfield, | |
100 | bfd_elf_generic_reloc, "R_386_GLOB_DAT", | |
101 | true, 0xffffffff, 0xffffffff, false), | |
102 | HOWTO(R_386_JUMP_SLOT, 0, 2, 32, false, 0, complain_overflow_bitfield, | |
103 | bfd_elf_generic_reloc, "R_386_JUMP_SLOT", | |
104 | true, 0xffffffff, 0xffffffff, false), | |
105 | HOWTO(R_386_RELATIVE, 0, 2, 32, false, 0, complain_overflow_bitfield, | |
106 | bfd_elf_generic_reloc, "R_386_RELATIVE", | |
107 | true, 0xffffffff, 0xffffffff, false), | |
108 | HOWTO(R_386_GOTOFF, 0, 2, 32, false, 0, complain_overflow_bitfield, | |
109 | bfd_elf_generic_reloc, "R_386_GOTOFF", | |
110 | true, 0xffffffff, 0xffffffff, false), | |
111 | HOWTO(R_386_GOTPC, 0, 2, 32, true, 0, complain_overflow_bitfield, | |
112 | bfd_elf_generic_reloc, "R_386_GOTPC", | |
113 | true, 0xffffffff, 0xffffffff, true), | |
114 | ||
dc47f327 AM |
115 | /* We have a gap in the reloc numbers here. |
116 | R_386_standard counts the number up to this point, and | |
117 | R_386_ext_offset is the value to subtract from a reloc type of | |
118 | R_386_16 thru R_386_PC8 to form an index into this table. */ | |
1b452ec6 AM |
119 | #define R_386_standard ((unsigned int) R_386_GOTPC + 1) |
120 | #define R_386_ext_offset ((unsigned int) R_386_16 - R_386_standard) | |
121 | ||
252b5132 | 122 | /* The remaining relocs are a GNU extension. */ |
1b452ec6 AM |
123 | HOWTO(R_386_16, 0, 1, 16, false, 0, complain_overflow_bitfield, |
124 | bfd_elf_generic_reloc, "R_386_16", | |
125 | true, 0xffff, 0xffff, false), | |
126 | HOWTO(R_386_PC16, 0, 1, 16, true, 0, complain_overflow_bitfield, | |
127 | bfd_elf_generic_reloc, "R_386_PC16", | |
128 | true, 0xffff, 0xffff, true), | |
129 | HOWTO(R_386_8, 0, 0, 8, false, 0, complain_overflow_bitfield, | |
130 | bfd_elf_generic_reloc, "R_386_8", | |
131 | true, 0xff, 0xff, false), | |
132 | HOWTO(R_386_PC8, 0, 0, 8, true, 0, complain_overflow_signed, | |
133 | bfd_elf_generic_reloc, "R_386_PC8", | |
dc47f327 AM |
134 | true, 0xff, 0xff, true), |
135 | ||
136 | /* Another gap. */ | |
137 | #define R_386_ext ((unsigned int) R_386_PC8 + 1 - R_386_ext_offset) | |
138 | #define R_386_vt_offset ((unsigned int) R_386_GNU_VTINHERIT - R_386_ext) | |
252b5132 RH |
139 | |
140 | /* GNU extension to record C++ vtable hierarchy. */ | |
252b5132 RH |
141 | HOWTO (R_386_GNU_VTINHERIT, /* type */ |
142 | 0, /* rightshift */ | |
143 | 2, /* size (0 = byte, 1 = short, 2 = long) */ | |
144 | 0, /* bitsize */ | |
145 | false, /* pc_relative */ | |
146 | 0, /* bitpos */ | |
147 | complain_overflow_dont, /* complain_on_overflow */ | |
148 | NULL, /* special_function */ | |
149 | "R_386_GNU_VTINHERIT", /* name */ | |
150 | false, /* partial_inplace */ | |
151 | 0, /* src_mask */ | |
152 | 0, /* dst_mask */ | |
dc47f327 | 153 | false), |
252b5132 RH |
154 | |
155 | /* GNU extension to record C++ vtable member usage. */ | |
252b5132 RH |
156 | HOWTO (R_386_GNU_VTENTRY, /* type */ |
157 | 0, /* rightshift */ | |
158 | 2, /* size (0 = byte, 1 = short, 2 = long) */ | |
159 | 0, /* bitsize */ | |
160 | false, /* pc_relative */ | |
161 | 0, /* bitpos */ | |
162 | complain_overflow_dont, /* complain_on_overflow */ | |
163 | _bfd_elf_rel_vtable_reloc_fn, /* special_function */ | |
164 | "R_386_GNU_VTENTRY", /* name */ | |
165 | false, /* partial_inplace */ | |
166 | 0, /* src_mask */ | |
167 | 0, /* dst_mask */ | |
dc47f327 AM |
168 | false) |
169 | ||
170 | #define R_386_vt ((unsigned int) R_386_GNU_VTENTRY + 1 - R_386_vt_offset) | |
171 | ||
172 | }; | |
173 | ||
252b5132 RH |
174 | #ifdef DEBUG_GEN_RELOC |
175 | #define TRACE(str) fprintf (stderr, "i386 bfd reloc lookup %d (%s)\n", code, str) | |
176 | #else | |
177 | #define TRACE(str) | |
178 | #endif | |
179 | ||
180 | static reloc_howto_type * | |
181 | elf_i386_reloc_type_lookup (abfd, code) | |
7442e600 | 182 | bfd *abfd ATTRIBUTE_UNUSED; |
252b5132 RH |
183 | bfd_reloc_code_real_type code; |
184 | { | |
185 | switch (code) | |
186 | { | |
187 | case BFD_RELOC_NONE: | |
188 | TRACE ("BFD_RELOC_NONE"); | |
1b452ec6 | 189 | return &elf_howto_table[(unsigned int) R_386_NONE ]; |
252b5132 RH |
190 | |
191 | case BFD_RELOC_32: | |
192 | TRACE ("BFD_RELOC_32"); | |
1b452ec6 | 193 | return &elf_howto_table[(unsigned int) R_386_32 ]; |
252b5132 RH |
194 | |
195 | case BFD_RELOC_CTOR: | |
196 | TRACE ("BFD_RELOC_CTOR"); | |
1b452ec6 | 197 | return &elf_howto_table[(unsigned int) R_386_32 ]; |
252b5132 RH |
198 | |
199 | case BFD_RELOC_32_PCREL: | |
200 | TRACE ("BFD_RELOC_PC32"); | |
1b452ec6 | 201 | return &elf_howto_table[(unsigned int) R_386_PC32 ]; |
252b5132 RH |
202 | |
203 | case BFD_RELOC_386_GOT32: | |
204 | TRACE ("BFD_RELOC_386_GOT32"); | |
1b452ec6 | 205 | return &elf_howto_table[(unsigned int) R_386_GOT32 ]; |
252b5132 RH |
206 | |
207 | case BFD_RELOC_386_PLT32: | |
208 | TRACE ("BFD_RELOC_386_PLT32"); | |
1b452ec6 | 209 | return &elf_howto_table[(unsigned int) R_386_PLT32 ]; |
252b5132 RH |
210 | |
211 | case BFD_RELOC_386_COPY: | |
212 | TRACE ("BFD_RELOC_386_COPY"); | |
1b452ec6 | 213 | return &elf_howto_table[(unsigned int) R_386_COPY ]; |
252b5132 RH |
214 | |
215 | case BFD_RELOC_386_GLOB_DAT: | |
216 | TRACE ("BFD_RELOC_386_GLOB_DAT"); | |
1b452ec6 | 217 | return &elf_howto_table[(unsigned int) R_386_GLOB_DAT ]; |
252b5132 RH |
218 | |
219 | case BFD_RELOC_386_JUMP_SLOT: | |
220 | TRACE ("BFD_RELOC_386_JUMP_SLOT"); | |
1b452ec6 | 221 | return &elf_howto_table[(unsigned int) R_386_JUMP_SLOT ]; |
252b5132 RH |
222 | |
223 | case BFD_RELOC_386_RELATIVE: | |
224 | TRACE ("BFD_RELOC_386_RELATIVE"); | |
1b452ec6 | 225 | return &elf_howto_table[(unsigned int) R_386_RELATIVE ]; |
252b5132 RH |
226 | |
227 | case BFD_RELOC_386_GOTOFF: | |
228 | TRACE ("BFD_RELOC_386_GOTOFF"); | |
1b452ec6 | 229 | return &elf_howto_table[(unsigned int) R_386_GOTOFF ]; |
252b5132 RH |
230 | |
231 | case BFD_RELOC_386_GOTPC: | |
232 | TRACE ("BFD_RELOC_386_GOTPC"); | |
1b452ec6 | 233 | return &elf_howto_table[(unsigned int) R_386_GOTPC ]; |
252b5132 RH |
234 | |
235 | /* The remaining relocs are a GNU extension. */ | |
236 | case BFD_RELOC_16: | |
237 | TRACE ("BFD_RELOC_16"); | |
1b452ec6 | 238 | return &elf_howto_table[(unsigned int) R_386_16 - R_386_ext_offset]; |
252b5132 RH |
239 | |
240 | case BFD_RELOC_16_PCREL: | |
241 | TRACE ("BFD_RELOC_16_PCREL"); | |
1b452ec6 | 242 | return &elf_howto_table[(unsigned int) R_386_PC16 - R_386_ext_offset]; |
252b5132 RH |
243 | |
244 | case BFD_RELOC_8: | |
245 | TRACE ("BFD_RELOC_8"); | |
1b452ec6 | 246 | return &elf_howto_table[(unsigned int) R_386_8 - R_386_ext_offset]; |
252b5132 RH |
247 | |
248 | case BFD_RELOC_8_PCREL: | |
249 | TRACE ("BFD_RELOC_8_PCREL"); | |
1b452ec6 | 250 | return &elf_howto_table[(unsigned int) R_386_PC8 - R_386_ext_offset]; |
252b5132 RH |
251 | |
252 | case BFD_RELOC_VTABLE_INHERIT: | |
253 | TRACE ("BFD_RELOC_VTABLE_INHERIT"); | |
dc47f327 AM |
254 | return &elf_howto_table[(unsigned int) R_386_GNU_VTINHERIT |
255 | - R_386_vt_offset]; | |
252b5132 RH |
256 | |
257 | case BFD_RELOC_VTABLE_ENTRY: | |
258 | TRACE ("BFD_RELOC_VTABLE_ENTRY"); | |
dc47f327 AM |
259 | return &elf_howto_table[(unsigned int) R_386_GNU_VTENTRY |
260 | - R_386_vt_offset]; | |
252b5132 RH |
261 | |
262 | default: | |
263 | break; | |
264 | } | |
265 | ||
266 | TRACE ("Unknown"); | |
267 | return 0; | |
268 | } | |
269 | ||
270 | static void | |
271 | elf_i386_info_to_howto (abfd, cache_ptr, dst) | |
7442e600 ILT |
272 | bfd *abfd ATTRIBUTE_UNUSED; |
273 | arelent *cache_ptr ATTRIBUTE_UNUSED; | |
274 | Elf32_Internal_Rela *dst ATTRIBUTE_UNUSED; | |
252b5132 RH |
275 | { |
276 | abort (); | |
277 | } | |
278 | ||
279 | static void | |
280 | elf_i386_info_to_howto_rel (abfd, cache_ptr, dst) | |
7442e600 | 281 | bfd *abfd ATTRIBUTE_UNUSED; |
252b5132 RH |
282 | arelent *cache_ptr; |
283 | Elf32_Internal_Rel *dst; | |
284 | { | |
dc47f327 AM |
285 | unsigned int r_type = ELF32_R_TYPE (dst->r_info); |
286 | unsigned int indx; | |
287 | ||
288 | if ((indx = r_type) >= R_386_standard | |
289 | && ((indx = r_type - R_386_ext_offset) - R_386_standard | |
290 | >= R_386_ext - R_386_standard) | |
291 | && ((indx = r_type - R_386_vt_offset) - R_386_ext | |
292 | >= R_386_vt - R_386_ext)) | |
252b5132 | 293 | { |
dc47f327 | 294 | (*_bfd_error_handler) (_("%s: invalid relocation type %d"), |
8f615d07 | 295 | bfd_archive_filename (abfd), (int) r_type); |
dc47f327 | 296 | indx = (unsigned int) R_386_NONE; |
252b5132 | 297 | } |
dc47f327 | 298 | cache_ptr->howto = &elf_howto_table[indx]; |
252b5132 RH |
299 | } |
300 | ||
301 | /* Return whether a symbol name implies a local label. The UnixWare | |
302 | 2.1 cc generates temporary symbols that start with .X, so we | |
303 | recognize them here. FIXME: do other SVR4 compilers also use .X?. | |
304 | If so, we should move the .X recognition into | |
305 | _bfd_elf_is_local_label_name. */ | |
306 | ||
307 | static boolean | |
308 | elf_i386_is_local_label_name (abfd, name) | |
309 | bfd *abfd; | |
310 | const char *name; | |
311 | { | |
312 | if (name[0] == '.' && name[1] == 'X') | |
313 | return true; | |
314 | ||
315 | return _bfd_elf_is_local_label_name (abfd, name); | |
316 | } | |
317 | \f | |
318 | /* Functions for the i386 ELF linker. */ | |
319 | ||
320 | /* The name of the dynamic interpreter. This is put in the .interp | |
321 | section. */ | |
322 | ||
323 | #define ELF_DYNAMIC_INTERPRETER "/usr/lib/libc.so.1" | |
324 | ||
325 | /* The size in bytes of an entry in the procedure linkage table. */ | |
326 | ||
327 | #define PLT_ENTRY_SIZE 16 | |
328 | ||
329 | /* The first entry in an absolute procedure linkage table looks like | |
330 | this. See the SVR4 ABI i386 supplement to see how this works. */ | |
331 | ||
332 | static const bfd_byte elf_i386_plt0_entry[PLT_ENTRY_SIZE] = | |
333 | { | |
334 | 0xff, 0x35, /* pushl contents of address */ | |
335 | 0, 0, 0, 0, /* replaced with address of .got + 4. */ | |
336 | 0xff, 0x25, /* jmp indirect */ | |
337 | 0, 0, 0, 0, /* replaced with address of .got + 8. */ | |
338 | 0, 0, 0, 0 /* pad out to 16 bytes. */ | |
339 | }; | |
340 | ||
341 | /* Subsequent entries in an absolute procedure linkage table look like | |
342 | this. */ | |
343 | ||
344 | static const bfd_byte elf_i386_plt_entry[PLT_ENTRY_SIZE] = | |
345 | { | |
346 | 0xff, 0x25, /* jmp indirect */ | |
347 | 0, 0, 0, 0, /* replaced with address of this symbol in .got. */ | |
348 | 0x68, /* pushl immediate */ | |
349 | 0, 0, 0, 0, /* replaced with offset into relocation table. */ | |
350 | 0xe9, /* jmp relative */ | |
351 | 0, 0, 0, 0 /* replaced with offset to start of .plt. */ | |
352 | }; | |
353 | ||
354 | /* The first entry in a PIC procedure linkage table look like this. */ | |
355 | ||
356 | static const bfd_byte elf_i386_pic_plt0_entry[PLT_ENTRY_SIZE] = | |
357 | { | |
358 | 0xff, 0xb3, 4, 0, 0, 0, /* pushl 4(%ebx) */ | |
359 | 0xff, 0xa3, 8, 0, 0, 0, /* jmp *8(%ebx) */ | |
360 | 0, 0, 0, 0 /* pad out to 16 bytes. */ | |
361 | }; | |
362 | ||
363 | /* Subsequent entries in a PIC procedure linkage table look like this. */ | |
364 | ||
365 | static const bfd_byte elf_i386_pic_plt_entry[PLT_ENTRY_SIZE] = | |
366 | { | |
367 | 0xff, 0xa3, /* jmp *offset(%ebx) */ | |
368 | 0, 0, 0, 0, /* replaced with offset of this symbol in .got. */ | |
369 | 0x68, /* pushl immediate */ | |
370 | 0, 0, 0, 0, /* replaced with offset into relocation table. */ | |
371 | 0xe9, /* jmp relative */ | |
372 | 0, 0, 0, 0 /* replaced with offset to start of .plt. */ | |
373 | }; | |
374 | ||
375 | /* The i386 linker needs to keep track of the number of relocs that it | |
ffb2e45b AM |
376 | decides to copy as dynamic relocs in check_relocs for each symbol. |
377 | This is so that it can later discard them if they are found to be | |
378 | unnecessary. We store the information in a field extending the | |
379 | regular ELF linker hash table. */ | |
252b5132 | 380 | |
ffb2e45b | 381 | struct elf_i386_dyn_relocs |
252b5132 | 382 | { |
ffb2e45b | 383 | struct elf_i386_dyn_relocs *next; |
0c715baa AM |
384 | |
385 | /* The input section of the reloc. */ | |
386 | asection *sec; | |
387 | ||
388 | /* Total number of relocs copied for the input section. */ | |
252b5132 | 389 | bfd_size_type count; |
0c715baa AM |
390 | |
391 | /* Number of pc-relative relocs copied for the input section. */ | |
392 | bfd_size_type pc_count; | |
252b5132 RH |
393 | }; |
394 | ||
395 | /* i386 ELF linker hash entry. */ | |
396 | ||
397 | struct elf_i386_link_hash_entry | |
398 | { | |
399 | struct elf_link_hash_entry root; | |
400 | ||
0c715baa | 401 | /* Track dynamic relocs copied for this symbol. */ |
ffb2e45b | 402 | struct elf_i386_dyn_relocs *dyn_relocs; |
252b5132 RH |
403 | }; |
404 | ||
405 | /* i386 ELF linker hash table. */ | |
406 | ||
407 | struct elf_i386_link_hash_table | |
408 | { | |
409 | struct elf_link_hash_table root; | |
252b5132 | 410 | |
6725bdbf AM |
411 | /* Short-cuts to get to dynamic linker sections. */ |
412 | asection *sgot; | |
413 | asection *sgotplt; | |
414 | asection *srelgot; | |
415 | asection *splt; | |
416 | asection *srelplt; | |
417 | asection *sdynbss; | |
418 | asection *srelbss; | |
419 | }; | |
252b5132 RH |
420 | |
421 | /* Get the i386 ELF linker hash table from a link_info structure. */ | |
422 | ||
423 | #define elf_i386_hash_table(p) \ | |
424 | ((struct elf_i386_link_hash_table *) ((p)->hash)) | |
425 | ||
426 | /* Create an entry in an i386 ELF linker hash table. */ | |
427 | ||
428 | static struct bfd_hash_entry * | |
429 | elf_i386_link_hash_newfunc (entry, table, string) | |
430 | struct bfd_hash_entry *entry; | |
431 | struct bfd_hash_table *table; | |
432 | const char *string; | |
433 | { | |
434 | struct elf_i386_link_hash_entry *ret = | |
435 | (struct elf_i386_link_hash_entry *) entry; | |
436 | ||
437 | /* Allocate the structure if it has not already been allocated by a | |
438 | subclass. */ | |
439 | if (ret == (struct elf_i386_link_hash_entry *) NULL) | |
440 | ret = ((struct elf_i386_link_hash_entry *) | |
441 | bfd_hash_allocate (table, | |
442 | sizeof (struct elf_i386_link_hash_entry))); | |
443 | if (ret == (struct elf_i386_link_hash_entry *) NULL) | |
444 | return (struct bfd_hash_entry *) ret; | |
445 | ||
446 | /* Call the allocation method of the superclass. */ | |
447 | ret = ((struct elf_i386_link_hash_entry *) | |
448 | _bfd_elf_link_hash_newfunc ((struct bfd_hash_entry *) ret, | |
449 | table, string)); | |
450 | if (ret != (struct elf_i386_link_hash_entry *) NULL) | |
451 | { | |
ffb2e45b | 452 | ret->dyn_relocs = NULL; |
252b5132 RH |
453 | } |
454 | ||
455 | return (struct bfd_hash_entry *) ret; | |
456 | } | |
457 | ||
458 | /* Create an i386 ELF linker hash table. */ | |
459 | ||
460 | static struct bfd_link_hash_table * | |
461 | elf_i386_link_hash_table_create (abfd) | |
462 | bfd *abfd; | |
463 | { | |
464 | struct elf_i386_link_hash_table *ret; | |
dc810e39 | 465 | bfd_size_type amt = sizeof (struct elf_i386_link_hash_table); |
252b5132 | 466 | |
dc810e39 | 467 | ret = (struct elf_i386_link_hash_table *) bfd_alloc (abfd, amt); |
252b5132 RH |
468 | if (ret == (struct elf_i386_link_hash_table *) NULL) |
469 | return NULL; | |
470 | ||
471 | if (! _bfd_elf_link_hash_table_init (&ret->root, abfd, | |
472 | elf_i386_link_hash_newfunc)) | |
473 | { | |
474 | bfd_release (abfd, ret); | |
475 | return NULL; | |
476 | } | |
477 | ||
6725bdbf AM |
478 | ret->sgot = NULL; |
479 | ret->sgotplt = NULL; | |
480 | ret->srelgot = NULL; | |
481 | ret->splt = NULL; | |
482 | ret->srelplt = NULL; | |
483 | ret->sdynbss = NULL; | |
484 | ret->srelbss = NULL; | |
485 | ||
252b5132 RH |
486 | return &ret->root.root; |
487 | } | |
488 | ||
6725bdbf AM |
489 | /* Create .got, .gotplt, and .rel.got sections in DYNOBJ, and set up |
490 | shortcuts to them in our hash table. */ | |
491 | ||
492 | static boolean | |
493 | create_got_section (dynobj, info) | |
494 | bfd *dynobj; | |
495 | struct bfd_link_info *info; | |
496 | { | |
497 | struct elf_i386_link_hash_table *htab; | |
498 | ||
499 | if (! _bfd_elf_create_got_section (dynobj, info)) | |
500 | return false; | |
501 | ||
502 | htab = elf_i386_hash_table (info); | |
503 | htab->sgot = bfd_get_section_by_name (dynobj, ".got"); | |
504 | htab->sgotplt = bfd_get_section_by_name (dynobj, ".got.plt"); | |
505 | if (!htab->sgot || !htab->sgotplt) | |
506 | abort (); | |
507 | ||
508 | htab->srelgot = bfd_make_section (dynobj, ".rel.got"); | |
509 | if (htab->srelgot == NULL | |
510 | || ! bfd_set_section_flags (dynobj, htab->srelgot, | |
511 | (SEC_ALLOC | SEC_LOAD | SEC_HAS_CONTENTS | |
512 | | SEC_IN_MEMORY | SEC_LINKER_CREATED | |
513 | | SEC_READONLY)) | |
514 | || ! bfd_set_section_alignment (dynobj, htab->srelgot, 2)) | |
515 | return false; | |
516 | return true; | |
517 | } | |
518 | ||
519 | /* Create .plt, .rel.plt, .got, .got.plt, .rel.got, .dynbss, and | |
520 | .rel.bss sections in DYNOBJ, and set up shortcuts to them in our | |
521 | hash table. */ | |
522 | ||
523 | static boolean | |
524 | elf_i386_create_dynamic_sections (dynobj, info) | |
525 | bfd *dynobj; | |
526 | struct bfd_link_info *info; | |
527 | { | |
528 | struct elf_i386_link_hash_table *htab; | |
529 | ||
530 | htab = elf_i386_hash_table (info); | |
531 | if (!htab->sgot && !create_got_section (dynobj, info)) | |
532 | return false; | |
533 | ||
534 | if (!_bfd_elf_create_dynamic_sections (dynobj, info)) | |
535 | return false; | |
536 | ||
537 | htab->splt = bfd_get_section_by_name (dynobj, ".plt"); | |
538 | htab->srelplt = bfd_get_section_by_name (dynobj, ".rel.plt"); | |
539 | htab->sdynbss = bfd_get_section_by_name (dynobj, ".dynbss"); | |
540 | if (!info->shared) | |
541 | htab->srelbss = bfd_get_section_by_name (dynobj, ".rel.bss"); | |
542 | ||
543 | if (!htab->splt || !htab->srelplt || !htab->sdynbss | |
544 | || (!info->shared && !htab->srelbss)) | |
545 | abort (); | |
546 | ||
547 | return true; | |
548 | } | |
549 | ||
252b5132 RH |
550 | /* Look through the relocs for a section during the first phase, and |
551 | allocate space in the global offset table or procedure linkage | |
552 | table. */ | |
553 | ||
554 | static boolean | |
555 | elf_i386_check_relocs (abfd, info, sec, relocs) | |
556 | bfd *abfd; | |
557 | struct bfd_link_info *info; | |
558 | asection *sec; | |
559 | const Elf_Internal_Rela *relocs; | |
560 | { | |
6725bdbf | 561 | struct elf_i386_link_hash_table *htab; |
252b5132 RH |
562 | bfd *dynobj; |
563 | Elf_Internal_Shdr *symtab_hdr; | |
564 | struct elf_link_hash_entry **sym_hashes; | |
dd5724d5 | 565 | bfd_signed_vma *local_got_refcounts; |
252b5132 RH |
566 | const Elf_Internal_Rela *rel; |
567 | const Elf_Internal_Rela *rel_end; | |
252b5132 RH |
568 | asection *sreloc; |
569 | ||
570 | if (info->relocateable) | |
571 | return true; | |
572 | ||
6725bdbf AM |
573 | htab = elf_i386_hash_table (info); |
574 | dynobj = htab->root.dynobj; | |
252b5132 RH |
575 | symtab_hdr = &elf_tdata (abfd)->symtab_hdr; |
576 | sym_hashes = elf_sym_hashes (abfd); | |
dd5724d5 | 577 | local_got_refcounts = elf_local_got_refcounts (abfd); |
252b5132 | 578 | |
252b5132 RH |
579 | sreloc = NULL; |
580 | ||
581 | rel_end = relocs + sec->reloc_count; | |
582 | for (rel = relocs; rel < rel_end; rel++) | |
583 | { | |
584 | unsigned long r_symndx; | |
585 | struct elf_link_hash_entry *h; | |
586 | ||
587 | r_symndx = ELF32_R_SYM (rel->r_info); | |
588 | ||
d9bc7a44 | 589 | if (r_symndx >= NUM_SHDR_ENTRIES (symtab_hdr)) |
f5f31454 | 590 | { |
8f615d07 AM |
591 | (*_bfd_error_handler) (_("%s: bad symbol index: %d"), |
592 | bfd_archive_filename (abfd), | |
593 | r_symndx); | |
f5f31454 L |
594 | return false; |
595 | } | |
596 | ||
252b5132 RH |
597 | if (r_symndx < symtab_hdr->sh_info) |
598 | h = NULL; | |
599 | else | |
600 | h = sym_hashes[r_symndx - symtab_hdr->sh_info]; | |
601 | ||
602 | /* Some relocs require a global offset table. */ | |
12d0ee4a | 603 | if (htab->sgot == NULL) |
252b5132 RH |
604 | { |
605 | switch (ELF32_R_TYPE (rel->r_info)) | |
606 | { | |
607 | case R_386_GOT32: | |
608 | case R_386_GOTOFF: | |
609 | case R_386_GOTPC: | |
12d0ee4a AM |
610 | if (dynobj == NULL) |
611 | htab->root.dynobj = dynobj = abfd; | |
6725bdbf | 612 | if (!create_got_section (dynobj, info)) |
252b5132 RH |
613 | return false; |
614 | break; | |
615 | ||
616 | default: | |
617 | break; | |
618 | } | |
619 | } | |
620 | ||
621 | switch (ELF32_R_TYPE (rel->r_info)) | |
622 | { | |
623 | case R_386_GOT32: | |
624 | /* This symbol requires a global offset table entry. */ | |
252b5132 RH |
625 | if (h != NULL) |
626 | { | |
dd5724d5 | 627 | if (h->got.refcount == -1) |
5a15f56f | 628 | h->got.refcount = 1; |
dd5724d5 AM |
629 | else |
630 | h->got.refcount += 1; | |
252b5132 RH |
631 | } |
632 | else | |
633 | { | |
83be169b | 634 | /* This is a global offset table entry for a local symbol. */ |
dd5724d5 | 635 | if (local_got_refcounts == NULL) |
252b5132 | 636 | { |
dc810e39 | 637 | bfd_size_type size; |
252b5132 | 638 | |
dc810e39 AM |
639 | size = symtab_hdr->sh_info; |
640 | size *= sizeof (bfd_signed_vma); | |
dd5724d5 AM |
641 | local_got_refcounts = ((bfd_signed_vma *) |
642 | bfd_alloc (abfd, size)); | |
643 | if (local_got_refcounts == NULL) | |
252b5132 | 644 | return false; |
dd5724d5 | 645 | elf_local_got_refcounts (abfd) = local_got_refcounts; |
dc810e39 | 646 | memset (local_got_refcounts, -1, (size_t) size); |
252b5132 | 647 | } |
dd5724d5 | 648 | if (local_got_refcounts[r_symndx] == -1) |
6725bdbf | 649 | local_got_refcounts[r_symndx] = 1; |
dd5724d5 AM |
650 | else |
651 | local_got_refcounts[r_symndx] += 1; | |
252b5132 | 652 | } |
252b5132 RH |
653 | break; |
654 | ||
655 | case R_386_PLT32: | |
656 | /* This symbol requires a procedure linkage table entry. We | |
83be169b AM |
657 | actually build the entry in adjust_dynamic_symbol, |
658 | because this might be a case of linking PIC code which is | |
659 | never referenced by a dynamic object, in which case we | |
660 | don't need to generate a procedure linkage table entry | |
661 | after all. */ | |
252b5132 RH |
662 | |
663 | /* If this is a local symbol, we resolve it directly without | |
83be169b | 664 | creating a procedure linkage table entry. */ |
252b5132 RH |
665 | if (h == NULL) |
666 | continue; | |
667 | ||
dd5724d5 AM |
668 | if (h->plt.refcount == -1) |
669 | { | |
dd5724d5 | 670 | h->elf_link_hash_flags |= ELF_LINK_HASH_NEEDS_PLT; |
6725bdbf | 671 | h->plt.refcount = 1; |
dd5724d5 AM |
672 | } |
673 | else | |
674 | h->plt.refcount += 1; | |
252b5132 RH |
675 | break; |
676 | ||
677 | case R_386_32: | |
678 | case R_386_PC32: | |
12d0ee4a | 679 | if (h != NULL && !info->shared) |
6725bdbf | 680 | { |
12d0ee4a AM |
681 | /* If this reloc is in a read-only section, we might |
682 | need a copy reloc. */ | |
683 | if ((sec->flags & SEC_READONLY) != 0) | |
684 | h->elf_link_hash_flags |= ELF_LINK_NON_GOT_REF; | |
685 | ||
686 | /* We may need a .plt entry if the function this reloc | |
687 | refers to is in a shared lib. */ | |
688 | if (h->plt.refcount == -1) | |
689 | h->plt.refcount = 1; | |
690 | else | |
691 | h->plt.refcount += 1; | |
6725bdbf | 692 | } |
7843f00e | 693 | |
252b5132 | 694 | /* If we are creating a shared library, and this is a reloc |
f69da49f AM |
695 | against a global symbol, or a non PC relative reloc |
696 | against a local symbol, then we need to copy the reloc | |
697 | into the shared library. However, if we are linking with | |
698 | -Bsymbolic, we do not need to copy a reloc against a | |
699 | global symbol which is defined in an object we are | |
700 | including in the link (i.e., DEF_REGULAR is set). At | |
701 | this point we have not seen all the input files, so it is | |
702 | possible that DEF_REGULAR is not set now but will be set | |
1f655a09 L |
703 | later (it is never cleared). In case of a weak definition, |
704 | DEF_REGULAR may be cleared later by a strong definition in | |
705 | a shared library. We account for that possibility below by | |
706 | storing information in the relocs_copied field of the hash | |
707 | table entry. A similar situation occurs when creating | |
708 | shared libraries and symbol visibility changes render the | |
12d0ee4a | 709 | symbol local. |
56882138 | 710 | |
12d0ee4a AM |
711 | If on the other hand, we are creating an executable, we |
712 | may need to keep relocations for symbols satisfied by a | |
713 | dynamic library if we manage to avoid copy relocs for the | |
714 | symbol. */ | |
715 | if ((info->shared | |
716 | && (sec->flags & SEC_ALLOC) != 0 | |
717 | && (ELF32_R_TYPE (rel->r_info) != R_386_PC32 | |
718 | || (h != NULL | |
719 | && (! info->symbolic | |
720 | || h->root.type == bfd_link_hash_defweak | |
721 | || (h->elf_link_hash_flags | |
722 | & ELF_LINK_HASH_DEF_REGULAR) == 0)))) | |
723 | || (!info->shared | |
724 | && (sec->flags & SEC_ALLOC) != 0 | |
725 | && h != NULL | |
726 | && (h->elf_link_hash_flags & ELF_LINK_NON_GOT_REF) == 0 | |
727 | && (h->root.type == bfd_link_hash_defweak | |
728 | || (h->elf_link_hash_flags | |
729 | & ELF_LINK_HASH_DEF_REGULAR) == 0))) | |
252b5132 | 730 | { |
12d0ee4a AM |
731 | /* We must copy these reloc types into the output file. |
732 | Create a reloc section in dynobj and make room for | |
733 | this reloc. */ | |
734 | if (dynobj == NULL) | |
735 | htab->root.dynobj = dynobj = abfd; | |
28d0b90e | 736 | |
252b5132 RH |
737 | if (sreloc == NULL) |
738 | { | |
739 | const char *name; | |
740 | ||
741 | name = (bfd_elf_string_from_elf_section | |
742 | (abfd, | |
743 | elf_elfheader (abfd)->e_shstrndx, | |
744 | elf_section_data (sec)->rel_hdr.sh_name)); | |
745 | if (name == NULL) | |
746 | return false; | |
747 | ||
c8492176 L |
748 | if (strncmp (name, ".rel", 4) != 0 |
749 | || strcmp (bfd_get_section_name (abfd, sec), | |
750 | name + 4) != 0) | |
751 | { | |
0c715baa AM |
752 | (*_bfd_error_handler) |
753 | (_("%s: bad relocation section name `%s\'"), | |
754 | bfd_archive_filename (abfd), name); | |
f5f31454 | 755 | } |
252b5132 RH |
756 | |
757 | sreloc = bfd_get_section_by_name (dynobj, name); | |
758 | if (sreloc == NULL) | |
759 | { | |
760 | flagword flags; | |
761 | ||
762 | sreloc = bfd_make_section (dynobj, name); | |
763 | flags = (SEC_HAS_CONTENTS | SEC_READONLY | |
764 | | SEC_IN_MEMORY | SEC_LINKER_CREATED); | |
765 | if ((sec->flags & SEC_ALLOC) != 0) | |
766 | flags |= SEC_ALLOC | SEC_LOAD; | |
767 | if (sreloc == NULL | |
768 | || ! bfd_set_section_flags (dynobj, sreloc, flags) | |
769 | || ! bfd_set_section_alignment (dynobj, sreloc, 2)) | |
770 | return false; | |
771 | } | |
0c715baa | 772 | elf_section_data (sec)->sreloc = sreloc; |
252b5132 RH |
773 | } |
774 | ||
0c715baa AM |
775 | /* If this is a global symbol, we count the number of |
776 | relocations we need for this symbol. */ | |
777 | if (h != NULL) | |
252b5132 RH |
778 | { |
779 | struct elf_i386_link_hash_entry *eh; | |
ffb2e45b | 780 | struct elf_i386_dyn_relocs *p; |
252b5132 RH |
781 | |
782 | eh = (struct elf_i386_link_hash_entry *) h; | |
0c715baa | 783 | p = eh->dyn_relocs; |
252b5132 | 784 | |
0c715baa | 785 | if (p == NULL || p->sec != sec) |
252b5132 | 786 | { |
ffb2e45b | 787 | p = ((struct elf_i386_dyn_relocs *) |
dc810e39 | 788 | bfd_alloc (dynobj, (bfd_size_type) sizeof *p)); |
252b5132 RH |
789 | if (p == NULL) |
790 | return false; | |
ffb2e45b AM |
791 | p->next = eh->dyn_relocs; |
792 | eh->dyn_relocs = p; | |
0c715baa | 793 | p->sec = sec; |
252b5132 | 794 | p->count = 0; |
0c715baa | 795 | p->pc_count = 0; |
252b5132 RH |
796 | } |
797 | ||
0c715baa AM |
798 | p->count += 1; |
799 | if (ELF32_R_TYPE (rel->r_info) == R_386_PC32) | |
800 | p->pc_count += 1; | |
801 | } | |
802 | else | |
803 | { | |
804 | /* Track dynamic relocs needed for local syms too. */ | |
805 | elf_section_data (sec)->local_dynrel += 1; | |
252b5132 RH |
806 | } |
807 | } | |
808 | ||
809 | break; | |
810 | ||
811 | /* This relocation describes the C++ object vtable hierarchy. | |
812 | Reconstruct it for later use during GC. */ | |
813 | case R_386_GNU_VTINHERIT: | |
814 | if (!_bfd_elf32_gc_record_vtinherit (abfd, sec, h, rel->r_offset)) | |
815 | return false; | |
816 | break; | |
817 | ||
818 | /* This relocation describes which C++ vtable entries are actually | |
819 | used. Record for later use during GC. */ | |
820 | case R_386_GNU_VTENTRY: | |
821 | if (!_bfd_elf32_gc_record_vtentry (abfd, sec, h, rel->r_offset)) | |
822 | return false; | |
823 | break; | |
824 | ||
825 | default: | |
826 | break; | |
827 | } | |
828 | } | |
829 | ||
830 | return true; | |
831 | } | |
832 | ||
833 | /* Return the section that should be marked against GC for a given | |
834 | relocation. */ | |
835 | ||
836 | static asection * | |
837 | elf_i386_gc_mark_hook (abfd, info, rel, h, sym) | |
838 | bfd *abfd; | |
7442e600 | 839 | struct bfd_link_info *info ATTRIBUTE_UNUSED; |
252b5132 RH |
840 | Elf_Internal_Rela *rel; |
841 | struct elf_link_hash_entry *h; | |
842 | Elf_Internal_Sym *sym; | |
843 | { | |
844 | if (h != NULL) | |
845 | { | |
846 | switch (ELF32_R_TYPE (rel->r_info)) | |
847 | { | |
848 | case R_386_GNU_VTINHERIT: | |
849 | case R_386_GNU_VTENTRY: | |
850 | break; | |
851 | ||
852 | default: | |
853 | switch (h->root.type) | |
854 | { | |
855 | case bfd_link_hash_defined: | |
856 | case bfd_link_hash_defweak: | |
857 | return h->root.u.def.section; | |
858 | ||
859 | case bfd_link_hash_common: | |
860 | return h->root.u.c.p->section; | |
861 | ||
862 | default: | |
863 | break; | |
864 | } | |
865 | } | |
866 | } | |
867 | else | |
868 | { | |
869 | if (!(elf_bad_symtab (abfd) | |
870 | && ELF_ST_BIND (sym->st_info) != STB_LOCAL) | |
871 | && ! ((sym->st_shndx <= 0 || sym->st_shndx >= SHN_LORESERVE) | |
872 | && sym->st_shndx != SHN_COMMON)) | |
873 | { | |
874 | return bfd_section_from_elf_index (abfd, sym->st_shndx); | |
875 | } | |
876 | } | |
877 | ||
878 | return NULL; | |
879 | } | |
880 | ||
881 | /* Update the got entry reference counts for the section being removed. */ | |
882 | ||
883 | static boolean | |
884 | elf_i386_gc_sweep_hook (abfd, info, sec, relocs) | |
dd5724d5 | 885 | bfd *abfd; |
6725bdbf | 886 | struct bfd_link_info *info; |
dd5724d5 AM |
887 | asection *sec; |
888 | const Elf_Internal_Rela *relocs; | |
252b5132 | 889 | { |
dd5724d5 AM |
890 | Elf_Internal_Shdr *symtab_hdr; |
891 | struct elf_link_hash_entry **sym_hashes; | |
892 | bfd_signed_vma *local_got_refcounts; | |
893 | const Elf_Internal_Rela *rel, *relend; | |
894 | unsigned long r_symndx; | |
895 | struct elf_link_hash_entry *h; | |
896 | bfd *dynobj; | |
dd5724d5 | 897 | |
0c715baa AM |
898 | elf_section_data (sec)->local_dynrel = 0; |
899 | ||
dd5724d5 AM |
900 | dynobj = elf_hash_table (info)->dynobj; |
901 | if (dynobj == NULL) | |
902 | return true; | |
903 | ||
6725bdbf AM |
904 | symtab_hdr = &elf_tdata (abfd)->symtab_hdr; |
905 | sym_hashes = elf_sym_hashes (abfd); | |
906 | local_got_refcounts = elf_local_got_refcounts (abfd); | |
dd5724d5 AM |
907 | |
908 | relend = relocs + sec->reloc_count; | |
909 | for (rel = relocs; rel < relend; rel++) | |
910 | switch (ELF32_R_TYPE (rel->r_info)) | |
911 | { | |
912 | case R_386_GOT32: | |
913 | case R_386_GOTOFF: | |
914 | case R_386_GOTPC: | |
915 | r_symndx = ELF32_R_SYM (rel->r_info); | |
916 | if (r_symndx >= symtab_hdr->sh_info) | |
917 | { | |
918 | h = sym_hashes[r_symndx - symtab_hdr->sh_info]; | |
919 | if (h->got.refcount > 0) | |
6725bdbf | 920 | h->got.refcount -= 1; |
dd5724d5 AM |
921 | } |
922 | else if (local_got_refcounts != NULL) | |
923 | { | |
924 | if (local_got_refcounts[r_symndx] > 0) | |
6725bdbf | 925 | local_got_refcounts[r_symndx] -= 1; |
dd5724d5 AM |
926 | } |
927 | break; | |
928 | ||
6725bdbf AM |
929 | case R_386_32: |
930 | case R_386_PC32: | |
0c715baa AM |
931 | r_symndx = ELF32_R_SYM (rel->r_info); |
932 | if (r_symndx >= symtab_hdr->sh_info) | |
933 | { | |
934 | struct elf_i386_link_hash_entry *eh; | |
935 | struct elf_i386_dyn_relocs **pp; | |
936 | struct elf_i386_dyn_relocs *p; | |
937 | ||
938 | h = sym_hashes[r_symndx - symtab_hdr->sh_info]; | |
939 | ||
940 | if (!info->shared && h->plt.refcount > 0) | |
941 | h->plt.refcount -= 1; | |
942 | ||
943 | eh = (struct elf_i386_link_hash_entry *) h; | |
944 | ||
945 | for (pp = &eh->dyn_relocs; (p = *pp) != NULL; pp = &p->next) | |
946 | if (p->sec == sec) | |
947 | { | |
948 | if (ELF32_R_TYPE (rel->r_info) == R_386_PC32) | |
949 | p->pc_count -= 1; | |
950 | p->count -= 1; | |
951 | if (p->count == 0) | |
952 | *pp = p->next; | |
953 | break; | |
954 | } | |
955 | } | |
956 | break; | |
6725bdbf | 957 | |
dd5724d5 AM |
958 | case R_386_PLT32: |
959 | r_symndx = ELF32_R_SYM (rel->r_info); | |
960 | if (r_symndx >= symtab_hdr->sh_info) | |
961 | { | |
962 | h = sym_hashes[r_symndx - symtab_hdr->sh_info]; | |
963 | if (h->plt.refcount > 0) | |
964 | h->plt.refcount -= 1; | |
965 | } | |
966 | break; | |
967 | ||
968 | default: | |
969 | break; | |
970 | } | |
252b5132 RH |
971 | |
972 | return true; | |
973 | } | |
974 | ||
975 | /* Adjust a symbol defined by a dynamic object and referenced by a | |
976 | regular object. The current definition is in some section of the | |
977 | dynamic object, but we're not including those sections. We have to | |
978 | change the definition to something the rest of the link can | |
979 | understand. */ | |
980 | ||
981 | static boolean | |
982 | elf_i386_adjust_dynamic_symbol (info, h) | |
983 | struct bfd_link_info *info; | |
984 | struct elf_link_hash_entry *h; | |
985 | { | |
6725bdbf | 986 | struct elf_i386_link_hash_table *htab; |
252b5132 RH |
987 | bfd *dynobj; |
988 | asection *s; | |
989 | unsigned int power_of_two; | |
990 | ||
6725bdbf AM |
991 | htab = elf_i386_hash_table (info); |
992 | dynobj = htab->root.dynobj; | |
252b5132 | 993 | |
252b5132 RH |
994 | /* If this is a function, put it in the procedure linkage table. We |
995 | will fill in the contents of the procedure linkage table later, | |
996 | when we know the address of the .got section. */ | |
997 | if (h->type == STT_FUNC | |
998 | || (h->elf_link_hash_flags & ELF_LINK_HASH_NEEDS_PLT) != 0) | |
999 | { | |
6725bdbf AM |
1000 | if (h->plt.refcount <= 0 |
1001 | || (! info->shared | |
1002 | && (h->elf_link_hash_flags & ELF_LINK_HASH_DEF_DYNAMIC) == 0 | |
1003 | && (h->elf_link_hash_flags & ELF_LINK_HASH_REF_DYNAMIC) == 0)) | |
252b5132 RH |
1004 | { |
1005 | /* This case can occur if we saw a PLT32 reloc in an input | |
dd5724d5 AM |
1006 | file, but the symbol was never referred to by a dynamic |
1007 | object, or if all references were garbage collected. In | |
1008 | such a case, we don't actually need to build a procedure | |
1009 | linkage table, and we can just do a PC32 reloc instead. */ | |
6725bdbf | 1010 | h->plt.refcount = (bfd_vma) -1; |
dd5724d5 | 1011 | h->elf_link_hash_flags &= ~ELF_LINK_HASH_NEEDS_PLT; |
252b5132 RH |
1012 | } |
1013 | ||
252b5132 RH |
1014 | return true; |
1015 | } | |
6725bdbf AM |
1016 | else |
1017 | /* It's possible that we incorrectly decided a .plt reloc was | |
1018 | needed for an R_386_PC32 reloc to a non-function sym in | |
1019 | check_relocs. We can't decide accurately between function and | |
1020 | non-function syms in check-relocs; Objects loaded later in | |
1021 | the link may change h->type. So fix it now. */ | |
1022 | h->plt.refcount = (bfd_vma) -1; | |
252b5132 RH |
1023 | |
1024 | /* If this is a weak symbol, and there is a real definition, the | |
1025 | processor independent code will have arranged for us to see the | |
1026 | real definition first, and we can just use the same value. */ | |
1027 | if (h->weakdef != NULL) | |
1028 | { | |
1029 | BFD_ASSERT (h->weakdef->root.type == bfd_link_hash_defined | |
1030 | || h->weakdef->root.type == bfd_link_hash_defweak); | |
1031 | h->root.u.def.section = h->weakdef->root.u.def.section; | |
1032 | h->root.u.def.value = h->weakdef->root.u.def.value; | |
1033 | return true; | |
1034 | } | |
1035 | ||
1036 | /* This is a reference to a symbol defined by a dynamic object which | |
1037 | is not a function. */ | |
1038 | ||
1039 | /* If we are creating a shared library, we must presume that the | |
1040 | only references to the symbol are via the global offset table. | |
1041 | For such cases we need not do anything here; the relocations will | |
1042 | be handled correctly by relocate_section. */ | |
1043 | if (info->shared) | |
1044 | return true; | |
1045 | ||
7843f00e ILT |
1046 | /* If there are no references to this symbol that do not use the |
1047 | GOT, we don't need to generate a copy reloc. */ | |
1048 | if ((h->elf_link_hash_flags & ELF_LINK_NON_GOT_REF) == 0) | |
1049 | return true; | |
1050 | ||
252b5132 RH |
1051 | /* We must allocate the symbol in our .dynbss section, which will |
1052 | become part of the .bss section of the executable. There will be | |
1053 | an entry for this symbol in the .dynsym section. The dynamic | |
1054 | object will contain position independent code, so all references | |
1055 | from the dynamic object to this symbol will go through the global | |
1056 | offset table. The dynamic linker will use the .dynsym entry to | |
1057 | determine the address it must put in the global offset table, so | |
1058 | both the dynamic object and the regular object will refer to the | |
1059 | same memory location for the variable. */ | |
1060 | ||
6725bdbf | 1061 | s = htab->sdynbss; |
ffb2e45b AM |
1062 | if (s == NULL) |
1063 | abort (); | |
252b5132 RH |
1064 | |
1065 | /* We must generate a R_386_COPY reloc to tell the dynamic linker to | |
1066 | copy the initial value out of the dynamic object and into the | |
1067 | runtime process image. We need to remember the offset into the | |
1068 | .rel.bss section we are going to use. */ | |
1069 | if ((h->root.u.def.section->flags & SEC_ALLOC) != 0) | |
1070 | { | |
1071 | asection *srel; | |
1072 | ||
6725bdbf | 1073 | srel = htab->srelbss; |
ffb2e45b AM |
1074 | if (srel == NULL) |
1075 | abort (); | |
252b5132 RH |
1076 | srel->_raw_size += sizeof (Elf32_External_Rel); |
1077 | h->elf_link_hash_flags |= ELF_LINK_HASH_NEEDS_COPY; | |
1078 | } | |
1079 | ||
1080 | /* We need to figure out the alignment required for this symbol. I | |
1081 | have no idea how ELF linkers handle this. */ | |
1082 | power_of_two = bfd_log2 (h->size); | |
1083 | if (power_of_two > 3) | |
1084 | power_of_two = 3; | |
1085 | ||
1086 | /* Apply the required alignment. */ | |
1087 | s->_raw_size = BFD_ALIGN (s->_raw_size, | |
1088 | (bfd_size_type) (1 << power_of_two)); | |
1089 | if (power_of_two > bfd_get_section_alignment (dynobj, s)) | |
1090 | { | |
1091 | if (! bfd_set_section_alignment (dynobj, s, power_of_two)) | |
1092 | return false; | |
1093 | } | |
1094 | ||
1095 | /* Define the symbol as being at this point in the section. */ | |
1096 | h->root.u.def.section = s; | |
1097 | h->root.u.def.value = s->_raw_size; | |
1098 | ||
1099 | /* Increment the section size to make room for the symbol. */ | |
1100 | s->_raw_size += h->size; | |
1101 | ||
1102 | return true; | |
1103 | } | |
1104 | ||
6725bdbf AM |
1105 | /* This is the condition under which elf_i386_finish_dynamic_symbol |
1106 | will be called from elflink.h. If elflink.h doesn't call our | |
1107 | finish_dynamic_symbol routine, we'll need to do something about | |
1108 | initializing any .plt and .got entries in elf_i386_relocate_section. */ | |
1109 | #define WILL_CALL_FINISH_DYNAMIC_SYMBOL(DYN, INFO, H) \ | |
1110 | ((DYN) \ | |
1111 | && ((INFO)->shared \ | |
1112 | || ((H)->elf_link_hash_flags & ELF_LINK_FORCED_LOCAL) == 0) \ | |
1113 | && ((H)->dynindx != -1 \ | |
1114 | || ((H)->elf_link_hash_flags & ELF_LINK_FORCED_LOCAL) != 0)) | |
1115 | ||
1116 | /* Allocate space in .plt, .got and associated reloc sections for | |
0c715baa | 1117 | dynamic relocs. */ |
6725bdbf AM |
1118 | |
1119 | static boolean | |
0c715baa | 1120 | allocate_dynrelocs (h, inf) |
6725bdbf AM |
1121 | struct elf_link_hash_entry *h; |
1122 | PTR inf; | |
1123 | { | |
1124 | struct bfd_link_info *info; | |
1125 | struct elf_i386_link_hash_table *htab; | |
1126 | asection *s; | |
5a15f56f | 1127 | struct elf_i386_link_hash_entry *eh; |
0c715baa | 1128 | struct elf_i386_dyn_relocs *p; |
6725bdbf AM |
1129 | |
1130 | if (h->root.type == bfd_link_hash_indirect | |
1131 | || h->root.type == bfd_link_hash_warning) | |
1132 | return true; | |
1133 | ||
1134 | info = (struct bfd_link_info *) inf; | |
1135 | htab = elf_i386_hash_table (info); | |
1136 | ||
1137 | if (htab->root.dynamic_sections_created | |
1138 | && h->plt.refcount > 0) | |
1139 | { | |
5a15f56f AM |
1140 | /* Make sure this symbol is output as a dynamic symbol. |
1141 | Undefined weak syms won't yet be marked as dynamic. */ | |
1142 | if (h->dynindx == -1 | |
1143 | && (h->elf_link_hash_flags & ELF_LINK_FORCED_LOCAL) == 0) | |
1144 | { | |
1145 | if (! bfd_elf32_link_record_dynamic_symbol (info, h)) | |
1146 | return false; | |
1147 | } | |
1148 | ||
6725bdbf | 1149 | s = htab->splt; |
ffb2e45b AM |
1150 | if (s == NULL) |
1151 | abort (); | |
6725bdbf AM |
1152 | |
1153 | /* If this is the first .plt entry, make room for the special | |
1154 | first entry. */ | |
1155 | if (s->_raw_size == 0) | |
1156 | s->_raw_size += PLT_ENTRY_SIZE; | |
1157 | ||
1158 | h->plt.offset = s->_raw_size; | |
1159 | ||
1160 | /* If this symbol is not defined in a regular file, and we are | |
1161 | not generating a shared library, then set the symbol to this | |
1162 | location in the .plt. This is required to make function | |
1163 | pointers compare as equal between the normal executable and | |
1164 | the shared library. */ | |
1165 | if (! info->shared | |
1166 | && (h->elf_link_hash_flags & ELF_LINK_HASH_DEF_REGULAR) == 0) | |
1167 | { | |
1168 | h->root.u.def.section = s; | |
1169 | h->root.u.def.value = h->plt.offset; | |
1170 | } | |
1171 | ||
1172 | /* Make room for this entry. */ | |
1173 | s->_raw_size += PLT_ENTRY_SIZE; | |
1174 | ||
1175 | /* We also need to make an entry in the .got.plt section, which | |
1176 | will be placed in the .got section by the linker script. */ | |
1177 | s = htab->sgotplt; | |
ffb2e45b AM |
1178 | if (s == NULL) |
1179 | abort (); | |
6725bdbf AM |
1180 | s->_raw_size += 4; |
1181 | ||
1182 | if (WILL_CALL_FINISH_DYNAMIC_SYMBOL (1, info, h)) | |
1183 | { | |
1184 | /* We also need to make an entry in the .rel.plt section. */ | |
1185 | s = htab->srelplt; | |
ffb2e45b AM |
1186 | if (s == NULL) |
1187 | abort (); | |
6725bdbf AM |
1188 | s->_raw_size += sizeof (Elf32_External_Rel); |
1189 | } | |
1190 | } | |
1191 | else | |
1192 | { | |
1193 | h->plt.offset = (bfd_vma) -1; | |
1194 | h->elf_link_hash_flags &= ~ELF_LINK_HASH_NEEDS_PLT; | |
1195 | } | |
1196 | ||
1197 | if (h->got.refcount > 0) | |
1198 | { | |
1199 | boolean dyn; | |
1200 | ||
5a15f56f AM |
1201 | /* Make sure this symbol is output as a dynamic symbol. |
1202 | Undefined weak syms won't yet be marked as dynamic. */ | |
1203 | if (h->dynindx == -1 | |
1204 | && (h->elf_link_hash_flags & ELF_LINK_FORCED_LOCAL) == 0) | |
1205 | { | |
1206 | if (! bfd_elf32_link_record_dynamic_symbol (info, h)) | |
1207 | return false; | |
1208 | } | |
1209 | ||
6725bdbf AM |
1210 | s = htab->sgot; |
1211 | h->got.offset = s->_raw_size; | |
1212 | s->_raw_size += 4; | |
1213 | dyn = htab->root.dynamic_sections_created; | |
1214 | if (WILL_CALL_FINISH_DYNAMIC_SYMBOL (dyn, info, h)) | |
1215 | htab->srelgot->_raw_size += sizeof (Elf32_External_Rel); | |
1216 | } | |
1217 | else | |
1218 | h->got.offset = (bfd_vma) -1; | |
1219 | ||
5a15f56f AM |
1220 | eh = (struct elf_i386_link_hash_entry *) h; |
1221 | if (eh->dyn_relocs == NULL) | |
1222 | return true; | |
1223 | ||
0c715baa AM |
1224 | /* In the shared -Bsymbolic case, discard space allocated for |
1225 | dynamic pc-relative relocs against symbols which turn out to be | |
1226 | defined in regular objects. For the normal shared case, discard | |
1227 | space for relocs that have become local due to symbol visibility | |
1228 | changes. */ | |
1229 | ||
1230 | if (info->shared) | |
5a15f56f | 1231 | { |
0c715baa AM |
1232 | if ((h->elf_link_hash_flags & ELF_LINK_HASH_DEF_REGULAR) != 0 |
1233 | && ((h->elf_link_hash_flags & ELF_LINK_FORCED_LOCAL) != 0 | |
1234 | || info->symbolic)) | |
5a15f56f | 1235 | { |
0c715baa AM |
1236 | struct elf_i386_dyn_relocs **pp; |
1237 | ||
1238 | for (pp = &eh->dyn_relocs; (p = *pp) != NULL; ) | |
1239 | { | |
1240 | p->count -= p->pc_count; | |
1241 | p->pc_count = 0; | |
1242 | if (p->count == 0) | |
1243 | *pp = p->next; | |
1244 | else | |
1245 | pp = &p->next; | |
1246 | } | |
5a15f56f | 1247 | } |
0c715baa AM |
1248 | } |
1249 | else | |
1250 | { | |
1251 | /* For the non-shared case, discard space for relocs against | |
1252 | symbols which turn out to need copy relocs or are not | |
1253 | dynamic. */ | |
1254 | ||
1255 | if ((h->elf_link_hash_flags & ELF_LINK_NON_GOT_REF) == 0 | |
1256 | && (((h->elf_link_hash_flags & ELF_LINK_HASH_DEF_DYNAMIC) != 0 | |
1257 | && (h->elf_link_hash_flags & ELF_LINK_HASH_DEF_REGULAR) == 0) | |
1258 | || (htab->root.dynamic_sections_created | |
1259 | && (h->root.type == bfd_link_hash_undefweak | |
1260 | || h->root.type == bfd_link_hash_undefined)))) | |
1261 | { | |
1262 | /* Make sure this symbol is output as a dynamic symbol. | |
1263 | Undefined weak syms won't yet be marked as dynamic. */ | |
1264 | if (h->dynindx == -1 | |
1265 | && (h->elf_link_hash_flags & ELF_LINK_FORCED_LOCAL) == 0) | |
1266 | { | |
1267 | if (! bfd_elf32_link_record_dynamic_symbol (info, h)) | |
1268 | return false; | |
1269 | } | |
5a15f56f | 1270 | |
0c715baa AM |
1271 | /* If that succeeded, we know we'll be keeping all the |
1272 | relocs. */ | |
1273 | if (h->dynindx != -1) | |
1274 | goto keep; | |
1275 | } | |
1276 | ||
1277 | eh->dyn_relocs = NULL; | |
1278 | ||
1279 | keep: | |
5a15f56f AM |
1280 | } |
1281 | ||
0c715baa AM |
1282 | /* Finally, allocate space. */ |
1283 | for (p = eh->dyn_relocs; p != NULL; p = p->next) | |
12d0ee4a | 1284 | { |
0c715baa AM |
1285 | asection *sreloc = elf_section_data (p->sec)->sreloc; |
1286 | sreloc->_raw_size += p->count * sizeof (Elf32_External_Rel); | |
12d0ee4a AM |
1287 | } |
1288 | ||
6725bdbf AM |
1289 | return true; |
1290 | } | |
1291 | ||
0c715baa AM |
1292 | /* Find any dynamic relocs that apply to read-only sections. */ |
1293 | ||
1294 | static boolean | |
1295 | readonly_dynrelocs (h, inf) | |
1296 | struct elf_link_hash_entry *h; | |
1297 | PTR inf; | |
1298 | { | |
1299 | struct elf_i386_link_hash_entry *eh; | |
1300 | struct elf_i386_dyn_relocs *p; | |
1301 | ||
1302 | eh = (struct elf_i386_link_hash_entry *) h; | |
1303 | for (p = eh->dyn_relocs; p != NULL; p = p->next) | |
1304 | { | |
1305 | asection *s = p->sec->output_section; | |
1306 | ||
1307 | if (s != NULL && (s->flags & SEC_READONLY) != 0) | |
1308 | { | |
1309 | struct bfd_link_info *info = (struct bfd_link_info *) inf; | |
1310 | ||
1311 | info->flags |= DF_TEXTREL; | |
1312 | ||
1313 | /* Not an error, just cut short the traversal. */ | |
1314 | return false; | |
1315 | } | |
1316 | } | |
1317 | return true; | |
1318 | } | |
1319 | ||
252b5132 RH |
1320 | /* Set the sizes of the dynamic sections. */ |
1321 | ||
1322 | static boolean | |
1323 | elf_i386_size_dynamic_sections (output_bfd, info) | |
db6751f2 | 1324 | bfd *output_bfd ATTRIBUTE_UNUSED; |
252b5132 RH |
1325 | struct bfd_link_info *info; |
1326 | { | |
6725bdbf | 1327 | struct elf_i386_link_hash_table *htab; |
252b5132 RH |
1328 | bfd *dynobj; |
1329 | asection *s; | |
252b5132 | 1330 | boolean relocs; |
0c715baa | 1331 | bfd *ibfd; |
252b5132 | 1332 | |
6725bdbf AM |
1333 | htab = elf_i386_hash_table (info); |
1334 | dynobj = htab->root.dynobj; | |
ffb2e45b AM |
1335 | if (dynobj == NULL) |
1336 | abort (); | |
252b5132 | 1337 | |
6725bdbf | 1338 | if (htab->root.dynamic_sections_created) |
252b5132 RH |
1339 | { |
1340 | /* Set the contents of the .interp section to the interpreter. */ | |
1341 | if (! info->shared) | |
1342 | { | |
1343 | s = bfd_get_section_by_name (dynobj, ".interp"); | |
ffb2e45b AM |
1344 | if (s == NULL) |
1345 | abort (); | |
252b5132 RH |
1346 | s->_raw_size = sizeof ELF_DYNAMIC_INTERPRETER; |
1347 | s->contents = (unsigned char *) ELF_DYNAMIC_INTERPRETER; | |
1348 | } | |
161d71a6 | 1349 | } |
6725bdbf | 1350 | |
0c715baa AM |
1351 | /* Set up .got offsets for local syms, and space for local dynamic |
1352 | relocs. */ | |
1353 | for (ibfd = info->input_bfds; ibfd != NULL; ibfd = ibfd->link_next) | |
161d71a6 L |
1354 | { |
1355 | bfd_signed_vma *local_got; | |
1356 | bfd_signed_vma *end_local_got; | |
1357 | bfd_size_type locsymcount; | |
1358 | Elf_Internal_Shdr *symtab_hdr; | |
1359 | asection *srel; | |
6725bdbf | 1360 | |
0c715baa | 1361 | if (bfd_get_flavour (ibfd) != bfd_target_elf_flavour) |
161d71a6 | 1362 | continue; |
6725bdbf | 1363 | |
0c715baa AM |
1364 | for (s = ibfd->sections; s != NULL; s = s->next) |
1365 | { | |
1366 | bfd_size_type count = elf_section_data (s)->local_dynrel; | |
1367 | ||
1368 | if (count != 0) | |
1369 | { | |
1370 | srel = elf_section_data (s)->sreloc; | |
1371 | srel->_raw_size += count * sizeof (Elf32_External_Rel); | |
1372 | } | |
1373 | } | |
1374 | ||
1375 | local_got = elf_local_got_refcounts (ibfd); | |
161d71a6 L |
1376 | if (!local_got) |
1377 | continue; | |
6725bdbf | 1378 | |
0c715baa | 1379 | symtab_hdr = &elf_tdata (ibfd)->symtab_hdr; |
161d71a6 L |
1380 | locsymcount = symtab_hdr->sh_info; |
1381 | end_local_got = local_got + locsymcount; | |
1382 | s = htab->sgot; | |
1383 | srel = htab->srelgot; | |
1384 | for (; local_got < end_local_got; ++local_got) | |
1385 | { | |
1386 | if (*local_got > 0) | |
6725bdbf | 1387 | { |
161d71a6 L |
1388 | *local_got = s->_raw_size; |
1389 | s->_raw_size += 4; | |
1390 | if (info->shared) | |
1391 | srel->_raw_size += sizeof (Elf32_External_Rel); | |
6725bdbf | 1392 | } |
161d71a6 L |
1393 | else |
1394 | *local_got = (bfd_vma) -1; | |
6725bdbf | 1395 | } |
252b5132 | 1396 | } |
6725bdbf | 1397 | |
0c715baa AM |
1398 | /* Allocate global sym .plt and .got entries, and space for global |
1399 | sym dynamic relocs. */ | |
1400 | elf_link_hash_traverse (&htab->root, allocate_dynrelocs, (PTR) info); | |
252b5132 | 1401 | |
5a15f56f AM |
1402 | /* We now have determined the sizes of the various dynamic sections. |
1403 | Allocate memory for them. */ | |
252b5132 | 1404 | relocs = false; |
252b5132 RH |
1405 | for (s = dynobj->sections; s != NULL; s = s->next) |
1406 | { | |
252b5132 RH |
1407 | if ((s->flags & SEC_LINKER_CREATED) == 0) |
1408 | continue; | |
1409 | ||
6725bdbf AM |
1410 | if (s == htab->splt |
1411 | || s == htab->sgot | |
1412 | || s == htab->sgotplt) | |
252b5132 | 1413 | { |
6725bdbf AM |
1414 | /* Strip this section if we don't need it; see the |
1415 | comment below. */ | |
252b5132 | 1416 | } |
6725bdbf | 1417 | else if (strncmp (bfd_get_section_name (dynobj, s), ".rel", 4) == 0) |
252b5132 RH |
1418 | { |
1419 | if (s->_raw_size == 0) | |
1420 | { | |
1421 | /* If we don't need this section, strip it from the | |
1422 | output file. This is mostly to handle .rel.bss and | |
1423 | .rel.plt. We must create both sections in | |
1424 | create_dynamic_sections, because they must be created | |
1425 | before the linker maps input sections to output | |
1426 | sections. The linker does that before | |
1427 | adjust_dynamic_symbol is called, and it is that | |
1428 | function which decides whether anything needs to go | |
1429 | into these sections. */ | |
252b5132 RH |
1430 | } |
1431 | else | |
1432 | { | |
6725bdbf | 1433 | if (s != htab->srelplt) |
db6751f2 | 1434 | relocs = true; |
252b5132 RH |
1435 | |
1436 | /* We use the reloc_count field as a counter if we need | |
1437 | to copy relocs into the output file. */ | |
1438 | s->reloc_count = 0; | |
1439 | } | |
1440 | } | |
6725bdbf | 1441 | else |
252b5132 RH |
1442 | { |
1443 | /* It's not one of our sections, so don't allocate space. */ | |
1444 | continue; | |
1445 | } | |
1446 | ||
6725bdbf | 1447 | if (s->_raw_size == 0) |
252b5132 | 1448 | { |
7f8d5fc9 | 1449 | _bfd_strip_section_from_output (info, s); |
252b5132 RH |
1450 | continue; |
1451 | } | |
1452 | ||
f69da49f AM |
1453 | /* Allocate memory for the section contents. We use bfd_zalloc |
1454 | here in case unused entries are not reclaimed before the | |
1455 | section's contents are written out. This should not happen, | |
1456 | but this way if it does, we get a R_386_NONE reloc instead | |
1457 | of garbage. */ | |
7a9af8c4 | 1458 | s->contents = (bfd_byte *) bfd_zalloc (dynobj, s->_raw_size); |
6725bdbf | 1459 | if (s->contents == NULL) |
252b5132 RH |
1460 | return false; |
1461 | } | |
1462 | ||
6725bdbf | 1463 | if (htab->root.dynamic_sections_created) |
252b5132 RH |
1464 | { |
1465 | /* Add some entries to the .dynamic section. We fill in the | |
1466 | values later, in elf_i386_finish_dynamic_sections, but we | |
1467 | must add the entries now so that we get the correct size for | |
1468 | the .dynamic section. The DT_DEBUG entry is filled in by the | |
1469 | dynamic linker and used by the debugger. */ | |
dc810e39 AM |
1470 | #define add_dynamic_entry(TAG, VAL) \ |
1471 | bfd_elf32_add_dynamic_entry (info, (bfd_vma) (TAG), (bfd_vma) (VAL)) | |
1472 | ||
252b5132 RH |
1473 | if (! info->shared) |
1474 | { | |
dc810e39 | 1475 | if (!add_dynamic_entry (DT_DEBUG, 0)) |
252b5132 RH |
1476 | return false; |
1477 | } | |
1478 | ||
6725bdbf | 1479 | if (htab->splt->_raw_size != 0) |
252b5132 | 1480 | { |
dc810e39 AM |
1481 | if (!add_dynamic_entry (DT_PLTGOT, 0) |
1482 | || !add_dynamic_entry (DT_PLTRELSZ, 0) | |
1483 | || !add_dynamic_entry (DT_PLTREL, DT_REL) | |
1484 | || !add_dynamic_entry (DT_JMPREL, 0)) | |
252b5132 RH |
1485 | return false; |
1486 | } | |
1487 | ||
1488 | if (relocs) | |
1489 | { | |
dc810e39 AM |
1490 | if (!add_dynamic_entry (DT_REL, 0) |
1491 | || !add_dynamic_entry (DT_RELSZ, 0) | |
1492 | || !add_dynamic_entry (DT_RELENT, sizeof (Elf32_External_Rel))) | |
252b5132 | 1493 | return false; |
252b5132 | 1494 | |
0c715baa AM |
1495 | /* If any dynamic relocs apply to a read-only section, |
1496 | then we need a DT_TEXTREL entry. */ | |
1497 | elf_link_hash_traverse (&htab->root, readonly_dynrelocs, (PTR) info); | |
1498 | ||
1499 | if ((info->flags & DF_TEXTREL) != 0) | |
1500 | { | |
1501 | if (!add_dynamic_entry (DT_TEXTREL, 0)) | |
1502 | return false; | |
1503 | } | |
252b5132 RH |
1504 | } |
1505 | } | |
dc810e39 | 1506 | #undef add_dynamic_entry |
252b5132 RH |
1507 | |
1508 | return true; | |
1509 | } | |
1510 | ||
252b5132 RH |
1511 | /* Relocate an i386 ELF section. */ |
1512 | ||
1513 | static boolean | |
1514 | elf_i386_relocate_section (output_bfd, info, input_bfd, input_section, | |
1515 | contents, relocs, local_syms, local_sections) | |
1516 | bfd *output_bfd; | |
1517 | struct bfd_link_info *info; | |
1518 | bfd *input_bfd; | |
1519 | asection *input_section; | |
1520 | bfd_byte *contents; | |
1521 | Elf_Internal_Rela *relocs; | |
1522 | Elf_Internal_Sym *local_syms; | |
1523 | asection **local_sections; | |
1524 | { | |
6725bdbf | 1525 | struct elf_i386_link_hash_table *htab; |
252b5132 RH |
1526 | bfd *dynobj; |
1527 | Elf_Internal_Shdr *symtab_hdr; | |
1528 | struct elf_link_hash_entry **sym_hashes; | |
1529 | bfd_vma *local_got_offsets; | |
252b5132 RH |
1530 | Elf_Internal_Rela *rel; |
1531 | Elf_Internal_Rela *relend; | |
1532 | ||
6725bdbf AM |
1533 | htab = elf_i386_hash_table (info); |
1534 | dynobj = htab->root.dynobj; | |
252b5132 RH |
1535 | symtab_hdr = &elf_tdata (input_bfd)->symtab_hdr; |
1536 | sym_hashes = elf_sym_hashes (input_bfd); | |
1537 | local_got_offsets = elf_local_got_offsets (input_bfd); | |
1538 | ||
252b5132 RH |
1539 | rel = relocs; |
1540 | relend = relocs + input_section->reloc_count; | |
1541 | for (; rel < relend; rel++) | |
1542 | { | |
1543 | int r_type; | |
1544 | reloc_howto_type *howto; | |
1545 | unsigned long r_symndx; | |
1546 | struct elf_link_hash_entry *h; | |
1547 | Elf_Internal_Sym *sym; | |
1548 | asection *sec; | |
ffb2e45b | 1549 | bfd_vma off; |
252b5132 | 1550 | bfd_vma relocation; |
83be169b | 1551 | boolean unresolved_reloc; |
252b5132 | 1552 | bfd_reloc_status_type r; |
1b452ec6 | 1553 | unsigned int indx; |
252b5132 RH |
1554 | |
1555 | r_type = ELF32_R_TYPE (rel->r_info); | |
dc47f327 AM |
1556 | if (r_type == (int) R_386_GNU_VTINHERIT |
1557 | || r_type == (int) R_386_GNU_VTENTRY) | |
252b5132 | 1558 | continue; |
dc47f327 | 1559 | |
1b452ec6 | 1560 | if ((indx = (unsigned) r_type) >= R_386_standard |
dc47f327 AM |
1561 | && ((indx = (unsigned) r_type - R_386_ext_offset) - R_386_standard |
1562 | >= R_386_ext - R_386_standard)) | |
252b5132 RH |
1563 | { |
1564 | bfd_set_error (bfd_error_bad_value); | |
1565 | return false; | |
1566 | } | |
1b452ec6 | 1567 | howto = elf_howto_table + indx; |
252b5132 RH |
1568 | |
1569 | r_symndx = ELF32_R_SYM (rel->r_info); | |
1570 | ||
1571 | if (info->relocateable) | |
1572 | { | |
1573 | /* This is a relocateable link. We don't have to change | |
1574 | anything, unless the reloc is against a section symbol, | |
1575 | in which case we have to adjust according to where the | |
1576 | section symbol winds up in the output section. */ | |
1577 | if (r_symndx < symtab_hdr->sh_info) | |
1578 | { | |
1579 | sym = local_syms + r_symndx; | |
1580 | if (ELF_ST_TYPE (sym->st_info) == STT_SECTION) | |
1581 | { | |
1582 | bfd_vma val; | |
1583 | ||
1584 | sec = local_sections[r_symndx]; | |
1585 | val = bfd_get_32 (input_bfd, contents + rel->r_offset); | |
1586 | val += sec->output_offset + sym->st_value; | |
1587 | bfd_put_32 (input_bfd, val, contents + rel->r_offset); | |
1588 | } | |
1589 | } | |
1590 | ||
1591 | continue; | |
1592 | } | |
1593 | ||
1594 | /* This is a final link. */ | |
1595 | h = NULL; | |
1596 | sym = NULL; | |
1597 | sec = NULL; | |
83be169b | 1598 | unresolved_reloc = false; |
252b5132 RH |
1599 | if (r_symndx < symtab_hdr->sh_info) |
1600 | { | |
1601 | sym = local_syms + r_symndx; | |
1602 | sec = local_sections[r_symndx]; | |
1603 | relocation = (sec->output_section->vma | |
1604 | + sec->output_offset | |
1605 | + sym->st_value); | |
1606 | } | |
1607 | else | |
1608 | { | |
1609 | h = sym_hashes[r_symndx - symtab_hdr->sh_info]; | |
1610 | while (h->root.type == bfd_link_hash_indirect | |
1611 | || h->root.type == bfd_link_hash_warning) | |
1612 | h = (struct elf_link_hash_entry *) h->root.u.i.link; | |
ffb2e45b | 1613 | |
6725bdbf | 1614 | relocation = 0; |
252b5132 RH |
1615 | if (h->root.type == bfd_link_hash_defined |
1616 | || h->root.type == bfd_link_hash_defweak) | |
1617 | { | |
1618 | sec = h->root.u.def.section; | |
83be169b AM |
1619 | if (sec->output_section == NULL) |
1620 | /* Set a flag that will be cleared later if we find a | |
1621 | relocation value for this symbol. output_section | |
1622 | is typically NULL for symbols satisfied by a shared | |
1623 | library. */ | |
1624 | unresolved_reloc = true; | |
252b5132 RH |
1625 | else |
1626 | relocation = (h->root.u.def.value | |
1627 | + sec->output_section->vma | |
1628 | + sec->output_offset); | |
1629 | } | |
1630 | else if (h->root.type == bfd_link_hash_undefweak) | |
6725bdbf | 1631 | ; |
671bae9c NC |
1632 | else if (info->shared |
1633 | && (!info->symbolic || info->allow_shlib_undefined) | |
3a27a730 L |
1634 | && !info->no_undefined |
1635 | && ELF_ST_VISIBILITY (h->other) == STV_DEFAULT) | |
6725bdbf | 1636 | ; |
252b5132 RH |
1637 | else |
1638 | { | |
1639 | if (! ((*info->callbacks->undefined_symbol) | |
1640 | (info, h->root.root.string, input_bfd, | |
5cc7c785 | 1641 | input_section, rel->r_offset, |
3a27a730 L |
1642 | (!info->shared || info->no_undefined |
1643 | || ELF_ST_VISIBILITY (h->other))))) | |
252b5132 | 1644 | return false; |
252b5132 RH |
1645 | } |
1646 | } | |
1647 | ||
1648 | switch (r_type) | |
1649 | { | |
1650 | case R_386_GOT32: | |
1651 | /* Relocation is to the entry for this symbol in the global | |
1652 | offset table. */ | |
ffb2e45b AM |
1653 | if (htab->sgot == NULL) |
1654 | abort (); | |
252b5132 RH |
1655 | |
1656 | if (h != NULL) | |
1657 | { | |
6725bdbf | 1658 | boolean dyn; |
252b5132 RH |
1659 | |
1660 | off = h->got.offset; | |
6725bdbf AM |
1661 | dyn = htab->root.dynamic_sections_created; |
1662 | if (! WILL_CALL_FINISH_DYNAMIC_SYMBOL (dyn, info, h) | |
252b5132 | 1663 | || (info->shared |
6725bdbf AM |
1664 | && (info->symbolic |
1665 | || h->dynindx == -1 | |
1666 | || (h->elf_link_hash_flags & ELF_LINK_FORCED_LOCAL)) | |
252b5132 RH |
1667 | && (h->elf_link_hash_flags & ELF_LINK_HASH_DEF_REGULAR))) |
1668 | { | |
1669 | /* This is actually a static link, or it is a | |
1670 | -Bsymbolic link and the symbol is defined | |
1671 | locally, or the symbol was forced to be local | |
1672 | because of a version file. We must initialize | |
1673 | this entry in the global offset table. Since the | |
1674 | offset must always be a multiple of 4, we use the | |
1675 | least significant bit to record whether we have | |
1676 | initialized it already. | |
1677 | ||
1678 | When doing a dynamic link, we create a .rel.got | |
1679 | relocation entry to initialize the value. This | |
1680 | is done in the finish_dynamic_symbol routine. */ | |
1681 | if ((off & 1) != 0) | |
1682 | off &= ~1; | |
1683 | else | |
1684 | { | |
1685 | bfd_put_32 (output_bfd, relocation, | |
6725bdbf | 1686 | htab->sgot->contents + off); |
252b5132 RH |
1687 | h->got.offset |= 1; |
1688 | } | |
1689 | } | |
8c694914 AM |
1690 | else |
1691 | unresolved_reloc = false; | |
252b5132 RH |
1692 | } |
1693 | else | |
1694 | { | |
ffb2e45b AM |
1695 | if (local_got_offsets == NULL) |
1696 | abort (); | |
252b5132 RH |
1697 | |
1698 | off = local_got_offsets[r_symndx]; | |
1699 | ||
1700 | /* The offset must always be a multiple of 4. We use | |
83be169b AM |
1701 | the least significant bit to record whether we have |
1702 | already generated the necessary reloc. */ | |
252b5132 RH |
1703 | if ((off & 1) != 0) |
1704 | off &= ~1; | |
1705 | else | |
1706 | { | |
6725bdbf AM |
1707 | bfd_put_32 (output_bfd, relocation, |
1708 | htab->sgot->contents + off); | |
252b5132 RH |
1709 | |
1710 | if (info->shared) | |
1711 | { | |
1712 | asection *srelgot; | |
1713 | Elf_Internal_Rel outrel; | |
1714 | ||
6725bdbf | 1715 | srelgot = htab->srelgot; |
ffb2e45b AM |
1716 | if (srelgot == NULL) |
1717 | abort (); | |
252b5132 | 1718 | |
6725bdbf AM |
1719 | outrel.r_offset = (htab->sgot->output_section->vma |
1720 | + htab->sgot->output_offset | |
252b5132 RH |
1721 | + off); |
1722 | outrel.r_info = ELF32_R_INFO (0, R_386_RELATIVE); | |
1723 | bfd_elf32_swap_reloc_out (output_bfd, &outrel, | |
1724 | (((Elf32_External_Rel *) | |
1725 | srelgot->contents) | |
1726 | + srelgot->reloc_count)); | |
1727 | ++srelgot->reloc_count; | |
1728 | } | |
1729 | ||
1730 | local_got_offsets[r_symndx] |= 1; | |
1731 | } | |
252b5132 RH |
1732 | } |
1733 | ||
ffb2e45b AM |
1734 | if (off >= (bfd_vma) -2) |
1735 | abort (); | |
1736 | ||
1737 | relocation = htab->sgot->output_offset + off; | |
252b5132 RH |
1738 | break; |
1739 | ||
1740 | case R_386_GOTOFF: | |
1741 | /* Relocation is relative to the start of the global offset | |
1742 | table. */ | |
1743 | ||
252b5132 RH |
1744 | /* Note that sgot->output_offset is not involved in this |
1745 | calculation. We always want the start of .got. If we | |
1746 | defined _GLOBAL_OFFSET_TABLE in a different way, as is | |
1747 | permitted by the ABI, we might have to change this | |
1748 | calculation. */ | |
6725bdbf | 1749 | relocation -= htab->sgot->output_section->vma; |
252b5132 RH |
1750 | break; |
1751 | ||
1752 | case R_386_GOTPC: | |
1753 | /* Use global offset table as symbol value. */ | |
6725bdbf | 1754 | relocation = htab->sgot->output_section->vma; |
83be169b | 1755 | unresolved_reloc = false; |
252b5132 RH |
1756 | break; |
1757 | ||
1758 | case R_386_PLT32: | |
1759 | /* Relocation is to the entry for this symbol in the | |
1760 | procedure linkage table. */ | |
1761 | ||
dd5724d5 | 1762 | /* Resolve a PLT32 reloc against a local symbol directly, |
83be169b | 1763 | without using the procedure linkage table. */ |
252b5132 RH |
1764 | if (h == NULL) |
1765 | break; | |
1766 | ||
dd5724d5 | 1767 | if (h->plt.offset == (bfd_vma) -1 |
6725bdbf | 1768 | || htab->splt == NULL) |
252b5132 RH |
1769 | { |
1770 | /* We didn't make a PLT entry for this symbol. This | |
83be169b AM |
1771 | happens when statically linking PIC code, or when |
1772 | using -Bsymbolic. */ | |
252b5132 RH |
1773 | break; |
1774 | } | |
1775 | ||
6725bdbf AM |
1776 | relocation = (htab->splt->output_section->vma |
1777 | + htab->splt->output_offset | |
252b5132 | 1778 | + h->plt.offset); |
83be169b | 1779 | unresolved_reloc = false; |
252b5132 RH |
1780 | break; |
1781 | ||
1782 | case R_386_32: | |
1783 | case R_386_PC32: | |
12d0ee4a AM |
1784 | if ((info->shared |
1785 | && (input_section->flags & SEC_ALLOC) != 0 | |
1786 | && (r_type != R_386_PC32 | |
1787 | || (h != NULL | |
1788 | && h->dynindx != -1 | |
1789 | && (! info->symbolic | |
1790 | || (h->elf_link_hash_flags | |
1791 | & ELF_LINK_HASH_DEF_REGULAR) == 0)))) | |
1792 | || (!info->shared | |
1793 | && (input_section->flags & SEC_ALLOC) != 0 | |
1794 | && h != NULL | |
1795 | && h->dynindx != -1 | |
1796 | && (h->elf_link_hash_flags & ELF_LINK_NON_GOT_REF) == 0 | |
56882138 AM |
1797 | && (((h->elf_link_hash_flags |
1798 | & ELF_LINK_HASH_DEF_DYNAMIC) != 0 | |
1799 | && (h->elf_link_hash_flags | |
1800 | & ELF_LINK_HASH_DEF_REGULAR) == 0) | |
28d0b90e AM |
1801 | || h->root.type == bfd_link_hash_undefweak |
1802 | || h->root.type == bfd_link_hash_undefined))) | |
252b5132 RH |
1803 | { |
1804 | Elf_Internal_Rel outrel; | |
1805 | boolean skip, relocate; | |
0c715baa AM |
1806 | asection *sreloc; |
1807 | Elf32_External_Rel *loc; | |
252b5132 RH |
1808 | |
1809 | /* When generating a shared object, these relocations | |
1810 | are copied into the output file to be resolved at run | |
1811 | time. */ | |
1812 | ||
252b5132 RH |
1813 | skip = false; |
1814 | ||
1815 | if (elf_section_data (input_section)->stab_info == NULL) | |
1816 | outrel.r_offset = rel->r_offset; | |
1817 | else | |
1818 | { | |
252b5132 | 1819 | off = (_bfd_stab_section_offset |
12d0ee4a | 1820 | (output_bfd, htab->root.stab_info, input_section, |
252b5132 RH |
1821 | &elf_section_data (input_section)->stab_info, |
1822 | rel->r_offset)); | |
1823 | if (off == (bfd_vma) -1) | |
1824 | skip = true; | |
1825 | outrel.r_offset = off; | |
1826 | } | |
1827 | ||
1828 | outrel.r_offset += (input_section->output_section->vma | |
1829 | + input_section->output_offset); | |
1830 | ||
1831 | if (skip) | |
1832 | { | |
1833 | memset (&outrel, 0, sizeof outrel); | |
1834 | relocate = false; | |
1835 | } | |
5a15f56f AM |
1836 | else if (h != NULL |
1837 | && h->dynindx != -1 | |
1838 | && (r_type == R_386_PC32 | |
1839 | || !info->shared | |
1840 | || !info->symbolic | |
1841 | || (h->elf_link_hash_flags | |
1842 | & ELF_LINK_HASH_DEF_REGULAR) == 0)) | |
1843 | ||
252b5132 | 1844 | { |
252b5132 | 1845 | relocate = false; |
5a15f56f | 1846 | outrel.r_info = ELF32_R_INFO (h->dynindx, r_type); |
252b5132 RH |
1847 | } |
1848 | else | |
1849 | { | |
5a15f56f AM |
1850 | /* This symbol is local, or marked to become local. */ |
1851 | relocate = true; | |
1852 | outrel.r_info = ELF32_R_INFO (0, R_386_RELATIVE); | |
252b5132 RH |
1853 | } |
1854 | ||
0c715baa AM |
1855 | sreloc = elf_section_data (input_section)->sreloc; |
1856 | if (sreloc == NULL) | |
1857 | abort (); | |
1858 | ||
1859 | loc = ((Elf32_External_Rel *) sreloc->contents | |
1860 | + sreloc->reloc_count); | |
1861 | sreloc->reloc_count += 1; | |
1862 | bfd_elf32_swap_reloc_out (output_bfd, &outrel, loc); | |
252b5132 RH |
1863 | |
1864 | /* If this reloc is against an external symbol, we do | |
1865 | not want to fiddle with the addend. Otherwise, we | |
1866 | need to include the symbol value so that it becomes | |
1867 | an addend for the dynamic reloc. */ | |
1868 | if (! relocate) | |
1869 | continue; | |
1870 | } | |
1871 | ||
1872 | break; | |
1873 | ||
1874 | default: | |
1875 | break; | |
1876 | } | |
1877 | ||
8c694914 AM |
1878 | /* FIXME: Why do we allow debugging sections to escape this error? |
1879 | More importantly, why do we not emit dynamic relocs for | |
1880 | R_386_32 above in debugging sections (which are ! SEC_ALLOC)? | |
1881 | If we had emitted the dynamic reloc, we could remove the | |
1882 | fudge here. */ | |
1883 | if (unresolved_reloc | |
1884 | && !(info->shared | |
1885 | && (input_section->flags & SEC_DEBUGGING) != 0 | |
1886 | && (h->elf_link_hash_flags & ELF_LINK_HASH_DEF_DYNAMIC) != 0)) | |
83be169b AM |
1887 | (*_bfd_error_handler) |
1888 | (_("%s(%s+0x%lx): unresolvable relocation against symbol `%s'"), | |
8f615d07 | 1889 | bfd_archive_filename (input_bfd), |
83be169b AM |
1890 | bfd_get_section_name (input_bfd, input_section), |
1891 | (long) rel->r_offset, | |
1892 | h->root.root.string); | |
1893 | ||
252b5132 RH |
1894 | r = _bfd_final_link_relocate (howto, input_bfd, input_section, |
1895 | contents, rel->r_offset, | |
1896 | relocation, (bfd_vma) 0); | |
1897 | ||
ffb2e45b | 1898 | switch (r) |
252b5132 | 1899 | { |
ffb2e45b AM |
1900 | case bfd_reloc_ok: |
1901 | break; | |
1902 | ||
1903 | case bfd_reloc_overflow: | |
1904 | { | |
1905 | const char *name; | |
1906 | ||
1907 | if (h != NULL) | |
1908 | name = h->root.root.string; | |
1909 | else | |
252b5132 | 1910 | { |
ffb2e45b AM |
1911 | name = bfd_elf_string_from_elf_section (input_bfd, |
1912 | symtab_hdr->sh_link, | |
1913 | sym->st_name); | |
1914 | if (name == NULL) | |
252b5132 | 1915 | return false; |
ffb2e45b AM |
1916 | if (*name == '\0') |
1917 | name = bfd_section_name (input_bfd, sec); | |
252b5132 | 1918 | } |
ffb2e45b AM |
1919 | if (! ((*info->callbacks->reloc_overflow) |
1920 | (info, name, howto->name, (bfd_vma) 0, | |
1921 | input_bfd, input_section, rel->r_offset))) | |
1922 | return false; | |
1923 | } | |
1924 | break; | |
1925 | ||
1926 | default: | |
1927 | case bfd_reloc_outofrange: | |
1928 | abort (); | |
1929 | break; | |
252b5132 RH |
1930 | } |
1931 | } | |
1932 | ||
1933 | return true; | |
1934 | } | |
1935 | ||
1936 | /* Finish up dynamic symbol handling. We set the contents of various | |
1937 | dynamic sections here. */ | |
1938 | ||
1939 | static boolean | |
1940 | elf_i386_finish_dynamic_symbol (output_bfd, info, h, sym) | |
1941 | bfd *output_bfd; | |
1942 | struct bfd_link_info *info; | |
1943 | struct elf_link_hash_entry *h; | |
1944 | Elf_Internal_Sym *sym; | |
1945 | { | |
6725bdbf | 1946 | struct elf_i386_link_hash_table *htab; |
252b5132 RH |
1947 | bfd *dynobj; |
1948 | ||
6725bdbf AM |
1949 | htab = elf_i386_hash_table (info); |
1950 | dynobj = htab->root.dynobj; | |
252b5132 RH |
1951 | |
1952 | if (h->plt.offset != (bfd_vma) -1) | |
1953 | { | |
252b5132 RH |
1954 | bfd_vma plt_index; |
1955 | bfd_vma got_offset; | |
1956 | Elf_Internal_Rel rel; | |
1957 | ||
1958 | /* This symbol has an entry in the procedure linkage table. Set | |
1959 | it up. */ | |
1960 | ||
ffb2e45b AM |
1961 | if (h->dynindx == -1 |
1962 | || htab->splt == NULL | |
1963 | || htab->sgotplt == NULL | |
1964 | || htab->srelplt == NULL) | |
1965 | abort (); | |
252b5132 RH |
1966 | |
1967 | /* Get the index in the procedure linkage table which | |
1968 | corresponds to this symbol. This is the index of this symbol | |
1969 | in all the symbols for which we are making plt entries. The | |
1970 | first entry in the procedure linkage table is reserved. */ | |
1971 | plt_index = h->plt.offset / PLT_ENTRY_SIZE - 1; | |
1972 | ||
1973 | /* Get the offset into the .got table of the entry that | |
1974 | corresponds to this function. Each .got entry is 4 bytes. | |
1975 | The first three are reserved. */ | |
1976 | got_offset = (plt_index + 3) * 4; | |
1977 | ||
1978 | /* Fill in the entry in the procedure linkage table. */ | |
1979 | if (! info->shared) | |
1980 | { | |
6725bdbf | 1981 | memcpy (htab->splt->contents + h->plt.offset, elf_i386_plt_entry, |
252b5132 RH |
1982 | PLT_ENTRY_SIZE); |
1983 | bfd_put_32 (output_bfd, | |
6725bdbf AM |
1984 | (htab->sgotplt->output_section->vma |
1985 | + htab->sgotplt->output_offset | |
252b5132 | 1986 | + got_offset), |
6725bdbf | 1987 | htab->splt->contents + h->plt.offset + 2); |
252b5132 RH |
1988 | } |
1989 | else | |
1990 | { | |
6725bdbf | 1991 | memcpy (htab->splt->contents + h->plt.offset, elf_i386_pic_plt_entry, |
252b5132 RH |
1992 | PLT_ENTRY_SIZE); |
1993 | bfd_put_32 (output_bfd, got_offset, | |
6725bdbf | 1994 | htab->splt->contents + h->plt.offset + 2); |
252b5132 RH |
1995 | } |
1996 | ||
1997 | bfd_put_32 (output_bfd, plt_index * sizeof (Elf32_External_Rel), | |
6725bdbf | 1998 | htab->splt->contents + h->plt.offset + 7); |
252b5132 | 1999 | bfd_put_32 (output_bfd, - (h->plt.offset + PLT_ENTRY_SIZE), |
6725bdbf | 2000 | htab->splt->contents + h->plt.offset + 12); |
252b5132 RH |
2001 | |
2002 | /* Fill in the entry in the global offset table. */ | |
2003 | bfd_put_32 (output_bfd, | |
6725bdbf AM |
2004 | (htab->splt->output_section->vma |
2005 | + htab->splt->output_offset | |
252b5132 RH |
2006 | + h->plt.offset |
2007 | + 6), | |
6725bdbf | 2008 | htab->sgotplt->contents + got_offset); |
252b5132 RH |
2009 | |
2010 | /* Fill in the entry in the .rel.plt section. */ | |
6725bdbf AM |
2011 | rel.r_offset = (htab->sgotplt->output_section->vma |
2012 | + htab->sgotplt->output_offset | |
252b5132 RH |
2013 | + got_offset); |
2014 | rel.r_info = ELF32_R_INFO (h->dynindx, R_386_JUMP_SLOT); | |
2015 | bfd_elf32_swap_reloc_out (output_bfd, &rel, | |
6725bdbf | 2016 | ((Elf32_External_Rel *) htab->srelplt->contents |
252b5132 RH |
2017 | + plt_index)); |
2018 | ||
2019 | if ((h->elf_link_hash_flags & ELF_LINK_HASH_DEF_REGULAR) == 0) | |
2020 | { | |
2021 | /* Mark the symbol as undefined, rather than as defined in | |
2022 | the .plt section. Leave the value alone. */ | |
2023 | sym->st_shndx = SHN_UNDEF; | |
2024 | } | |
2025 | } | |
2026 | ||
2027 | if (h->got.offset != (bfd_vma) -1) | |
2028 | { | |
252b5132 RH |
2029 | Elf_Internal_Rel rel; |
2030 | ||
2031 | /* This symbol has an entry in the global offset table. Set it | |
2032 | up. */ | |
2033 | ||
ffb2e45b AM |
2034 | if (htab->sgot == NULL || htab->srelgot == NULL) |
2035 | abort (); | |
252b5132 | 2036 | |
6725bdbf AM |
2037 | rel.r_offset = (htab->sgot->output_section->vma |
2038 | + htab->sgot->output_offset | |
dc810e39 | 2039 | + (h->got.offset & ~(bfd_vma) 1)); |
252b5132 | 2040 | |
dd5724d5 AM |
2041 | /* If this is a static link, or it is a -Bsymbolic link and the |
2042 | symbol is defined locally or was forced to be local because | |
2043 | of a version file, we just want to emit a RELATIVE reloc. | |
252b5132 RH |
2044 | The entry in the global offset table will already have been |
2045 | initialized in the relocate_section function. */ | |
6725bdbf AM |
2046 | if (info->shared |
2047 | && (info->symbolic | |
2048 | || h->dynindx == -1 | |
2049 | || (h->elf_link_hash_flags & ELF_LINK_FORCED_LOCAL)) | |
2050 | && (h->elf_link_hash_flags & ELF_LINK_HASH_DEF_REGULAR)) | |
dd5724d5 | 2051 | { |
6725bdbf | 2052 | BFD_ASSERT((h->got.offset & 1) != 0); |
dd5724d5 AM |
2053 | rel.r_info = ELF32_R_INFO (0, R_386_RELATIVE); |
2054 | } | |
252b5132 RH |
2055 | else |
2056 | { | |
dd5724d5 | 2057 | BFD_ASSERT((h->got.offset & 1) == 0); |
6725bdbf AM |
2058 | bfd_put_32 (output_bfd, (bfd_vma) 0, |
2059 | htab->sgot->contents + h->got.offset); | |
252b5132 RH |
2060 | rel.r_info = ELF32_R_INFO (h->dynindx, R_386_GLOB_DAT); |
2061 | } | |
2062 | ||
2063 | bfd_elf32_swap_reloc_out (output_bfd, &rel, | |
6725bdbf AM |
2064 | ((Elf32_External_Rel *) htab->srelgot->contents |
2065 | + htab->srelgot->reloc_count)); | |
2066 | ++htab->srelgot->reloc_count; | |
252b5132 RH |
2067 | } |
2068 | ||
791987af | 2069 | if ((h->elf_link_hash_flags & ELF_LINK_HASH_NEEDS_COPY) != 0) |
252b5132 | 2070 | { |
252b5132 RH |
2071 | Elf_Internal_Rel rel; |
2072 | ||
2073 | /* This symbol needs a copy reloc. Set it up. */ | |
2074 | ||
ffb2e45b AM |
2075 | if (h->dynindx == -1 |
2076 | || (h->root.type != bfd_link_hash_defined | |
2077 | && h->root.type != bfd_link_hash_defweak) | |
2078 | || htab->srelbss == NULL) | |
2079 | abort (); | |
252b5132 RH |
2080 | |
2081 | rel.r_offset = (h->root.u.def.value | |
2082 | + h->root.u.def.section->output_section->vma | |
2083 | + h->root.u.def.section->output_offset); | |
2084 | rel.r_info = ELF32_R_INFO (h->dynindx, R_386_COPY); | |
2085 | bfd_elf32_swap_reloc_out (output_bfd, &rel, | |
6725bdbf AM |
2086 | ((Elf32_External_Rel *) htab->srelbss->contents |
2087 | + htab->srelbss->reloc_count)); | |
2088 | ++htab->srelbss->reloc_count; | |
252b5132 RH |
2089 | } |
2090 | ||
2091 | /* Mark _DYNAMIC and _GLOBAL_OFFSET_TABLE_ as absolute. */ | |
2092 | if (strcmp (h->root.root.string, "_DYNAMIC") == 0 | |
2093 | || strcmp (h->root.root.string, "_GLOBAL_OFFSET_TABLE_") == 0) | |
2094 | sym->st_shndx = SHN_ABS; | |
2095 | ||
2096 | return true; | |
2097 | } | |
2098 | ||
2099 | /* Finish up the dynamic sections. */ | |
2100 | ||
2101 | static boolean | |
2102 | elf_i386_finish_dynamic_sections (output_bfd, info) | |
2103 | bfd *output_bfd; | |
2104 | struct bfd_link_info *info; | |
2105 | { | |
6725bdbf | 2106 | struct elf_i386_link_hash_table *htab; |
252b5132 | 2107 | bfd *dynobj; |
252b5132 RH |
2108 | asection *sdyn; |
2109 | ||
6725bdbf AM |
2110 | htab = elf_i386_hash_table (info); |
2111 | dynobj = htab->root.dynobj; | |
252b5132 RH |
2112 | sdyn = bfd_get_section_by_name (dynobj, ".dynamic"); |
2113 | ||
6725bdbf | 2114 | if (htab->root.dynamic_sections_created) |
252b5132 | 2115 | { |
252b5132 RH |
2116 | Elf32_External_Dyn *dyncon, *dynconend; |
2117 | ||
ffb2e45b AM |
2118 | if (sdyn == NULL || htab->sgot == NULL) |
2119 | abort (); | |
252b5132 RH |
2120 | |
2121 | dyncon = (Elf32_External_Dyn *) sdyn->contents; | |
2122 | dynconend = (Elf32_External_Dyn *) (sdyn->contents + sdyn->_raw_size); | |
2123 | for (; dyncon < dynconend; dyncon++) | |
2124 | { | |
2125 | Elf_Internal_Dyn dyn; | |
252b5132 RH |
2126 | |
2127 | bfd_elf32_swap_dyn_in (dynobj, dyncon, &dyn); | |
2128 | ||
2129 | switch (dyn.d_tag) | |
2130 | { | |
2131 | default: | |
2132 | break; | |
2133 | ||
2134 | case DT_PLTGOT: | |
6725bdbf AM |
2135 | dyn.d_un.d_ptr = htab->sgot->output_section->vma; |
2136 | bfd_elf32_swap_dyn_out (output_bfd, &dyn, dyncon); | |
2137 | break; | |
2138 | ||
252b5132 | 2139 | case DT_JMPREL: |
6725bdbf | 2140 | dyn.d_un.d_ptr = htab->srelplt->output_section->vma; |
252b5132 RH |
2141 | bfd_elf32_swap_dyn_out (output_bfd, &dyn, dyncon); |
2142 | break; | |
2143 | ||
2144 | case DT_PLTRELSZ: | |
6725bdbf AM |
2145 | if (htab->srelplt->output_section->_cooked_size != 0) |
2146 | dyn.d_un.d_val = htab->srelplt->output_section->_cooked_size; | |
252b5132 | 2147 | else |
6725bdbf | 2148 | dyn.d_un.d_val = htab->srelplt->output_section->_raw_size; |
252b5132 RH |
2149 | bfd_elf32_swap_dyn_out (output_bfd, &dyn, dyncon); |
2150 | break; | |
2151 | ||
2152 | case DT_RELSZ: | |
2153 | /* My reading of the SVR4 ABI indicates that the | |
2154 | procedure linkage table relocs (DT_JMPREL) should be | |
2155 | included in the overall relocs (DT_REL). This is | |
2156 | what Solaris does. However, UnixWare can not handle | |
2157 | that case. Therefore, we override the DT_RELSZ entry | |
2158 | here to make it not include the JMPREL relocs. Since | |
2159 | the linker script arranges for .rel.plt to follow all | |
2160 | other relocation sections, we don't have to worry | |
2161 | about changing the DT_REL entry. */ | |
6725bdbf | 2162 | if (htab->srelplt != NULL) |
252b5132 | 2163 | { |
6725bdbf AM |
2164 | if (htab->srelplt->output_section->_cooked_size != 0) |
2165 | dyn.d_un.d_val -= htab->srelplt->output_section->_cooked_size; | |
252b5132 | 2166 | else |
6725bdbf | 2167 | dyn.d_un.d_val -= htab->srelplt->output_section->_raw_size; |
252b5132 RH |
2168 | } |
2169 | bfd_elf32_swap_dyn_out (output_bfd, &dyn, dyncon); | |
2170 | break; | |
2171 | } | |
2172 | } | |
2173 | ||
2174 | /* Fill in the first entry in the procedure linkage table. */ | |
6725bdbf | 2175 | if (htab->splt && htab->splt->_raw_size > 0) |
252b5132 RH |
2176 | { |
2177 | if (info->shared) | |
6725bdbf AM |
2178 | memcpy (htab->splt->contents, |
2179 | elf_i386_pic_plt0_entry, PLT_ENTRY_SIZE); | |
252b5132 RH |
2180 | else |
2181 | { | |
6725bdbf AM |
2182 | memcpy (htab->splt->contents, |
2183 | elf_i386_plt0_entry, PLT_ENTRY_SIZE); | |
252b5132 | 2184 | bfd_put_32 (output_bfd, |
6725bdbf AM |
2185 | (htab->sgotplt->output_section->vma |
2186 | + htab->sgotplt->output_offset | |
2187 | + 4), | |
2188 | htab->splt->contents + 2); | |
252b5132 | 2189 | bfd_put_32 (output_bfd, |
6725bdbf AM |
2190 | (htab->sgotplt->output_section->vma |
2191 | + htab->sgotplt->output_offset | |
2192 | + 8), | |
2193 | htab->splt->contents + 8); | |
252b5132 RH |
2194 | } |
2195 | ||
2196 | /* UnixWare sets the entsize of .plt to 4, although that doesn't | |
2197 | really seem like the right value. */ | |
6725bdbf AM |
2198 | elf_section_data (htab->splt->output_section) |
2199 | ->this_hdr.sh_entsize = 4; | |
252b5132 RH |
2200 | } |
2201 | } | |
2202 | ||
12d0ee4a | 2203 | if (htab->sgotplt) |
252b5132 | 2204 | { |
12d0ee4a AM |
2205 | /* Fill in the first three entries in the global offset table. */ |
2206 | if (htab->sgotplt->_raw_size > 0) | |
2207 | { | |
2208 | bfd_put_32 (output_bfd, | |
2209 | (sdyn == NULL ? (bfd_vma) 0 | |
2210 | : sdyn->output_section->vma + sdyn->output_offset), | |
2211 | htab->sgotplt->contents); | |
2212 | bfd_put_32 (output_bfd, (bfd_vma) 0, htab->sgotplt->contents + 4); | |
2213 | bfd_put_32 (output_bfd, (bfd_vma) 0, htab->sgotplt->contents + 8); | |
2214 | } | |
252b5132 | 2215 | |
12d0ee4a AM |
2216 | elf_section_data (htab->sgotplt->output_section)->this_hdr.sh_entsize = 4; |
2217 | } | |
252b5132 RH |
2218 | return true; |
2219 | } | |
2220 | ||
dd484e5c L |
2221 | /* Set the correct type for an x86 ELF section. We do this by the |
2222 | section name, which is a hack, but ought to work. */ | |
2223 | ||
2224 | static boolean | |
2225 | elf_i386_fake_sections (abfd, hdr, sec) | |
2226 | bfd *abfd ATTRIBUTE_UNUSED; | |
2227 | Elf32_Internal_Shdr *hdr; | |
2228 | asection *sec; | |
2229 | { | |
2230 | register const char *name; | |
2231 | ||
2232 | name = bfd_get_section_name (abfd, sec); | |
2233 | ||
2234 | if (strcmp (name, ".reloc") == 0) | |
2235 | /* | |
2236 | * This is an ugly, but unfortunately necessary hack that is | |
2237 | * needed when producing EFI binaries on x86. It tells | |
2238 | * elf.c:elf_fake_sections() not to consider ".reloc" as a section | |
2239 | * containing ELF relocation info. We need this hack in order to | |
2240 | * be able to generate ELF binaries that can be translated into | |
2241 | * EFI applications (which are essentially COFF objects). Those | |
2242 | * files contain a COFF ".reloc" section inside an ELFNN object, | |
2243 | * which would normally cause BFD to segfault because it would | |
2244 | * attempt to interpret this section as containing relocation | |
2245 | * entries for section "oc". With this hack enabled, ".reloc" | |
2246 | * will be treated as a normal data section, which will avoid the | |
2247 | * segfault. However, you won't be able to create an ELFNN binary | |
2248 | * with a section named "oc" that needs relocations, but that's | |
2249 | * the kind of ugly side-effects you get when detecting section | |
2250 | * types based on their names... In practice, this limitation is | |
2251 | * unlikely to bite. | |
2252 | */ | |
2253 | hdr->sh_type = SHT_PROGBITS; | |
2254 | ||
2255 | return true; | |
2256 | } | |
2257 | ||
db6751f2 | 2258 | static enum elf_reloc_type_class |
f51e552e AM |
2259 | elf_i386_reloc_type_class (rela) |
2260 | const Elf_Internal_Rela *rela; | |
db6751f2 | 2261 | { |
f51e552e | 2262 | switch ((int) ELF32_R_TYPE (rela->r_info)) |
db6751f2 JJ |
2263 | { |
2264 | case R_386_RELATIVE: | |
2265 | return reloc_class_relative; | |
2266 | case R_386_JUMP_SLOT: | |
2267 | return reloc_class_plt; | |
2268 | case R_386_COPY: | |
2269 | return reloc_class_copy; | |
2270 | default: | |
2271 | return reloc_class_normal; | |
2272 | } | |
2273 | } | |
dd484e5c | 2274 | |
c5fccbec DJ |
2275 | /* Support for core dump NOTE sections */ |
2276 | static boolean | |
2277 | elf_i386_grok_prstatus (abfd, note) | |
2278 | bfd *abfd; | |
2279 | Elf_Internal_Note *note; | |
2280 | { | |
2281 | int offset; | |
dc810e39 | 2282 | size_t raw_size; |
c5fccbec DJ |
2283 | |
2284 | switch (note->descsz) | |
2285 | { | |
2286 | default: | |
2287 | return false; | |
2288 | ||
2289 | case 144: /* Linux/i386 */ | |
2290 | /* pr_cursig */ | |
2291 | elf_tdata (abfd)->core_signal = bfd_get_16 (abfd, note->descdata + 12); | |
2292 | ||
2293 | /* pr_pid */ | |
2294 | elf_tdata (abfd)->core_pid = bfd_get_32 (abfd, note->descdata + 24); | |
2295 | ||
2296 | /* pr_reg */ | |
2297 | offset = 72; | |
2298 | raw_size = 68; | |
2299 | ||
2300 | break; | |
2301 | } | |
2302 | ||
2303 | /* Make a ".reg/999" section. */ | |
2304 | return _bfd_elfcore_make_pseudosection (abfd, ".reg", | |
2305 | raw_size, note->descpos + offset); | |
2306 | } | |
2307 | ||
2308 | static boolean | |
2309 | elf_i386_grok_psinfo (abfd, note) | |
2310 | bfd *abfd; | |
2311 | Elf_Internal_Note *note; | |
2312 | { | |
2313 | switch (note->descsz) | |
2314 | { | |
2315 | default: | |
2316 | return false; | |
2317 | ||
2318 | case 128: /* Linux/MIPS elf_prpsinfo */ | |
2319 | elf_tdata (abfd)->core_program | |
2320 | = _bfd_elfcore_strndup (abfd, note->descdata + 28, 16); | |
2321 | elf_tdata (abfd)->core_command | |
2322 | = _bfd_elfcore_strndup (abfd, note->descdata + 44, 80); | |
2323 | } | |
2324 | ||
2325 | /* Note that for some reason, a spurious space is tacked | |
2326 | onto the end of the args in some (at least one anyway) | |
2327 | implementations, so strip it off if it exists. */ | |
2328 | ||
2329 | { | |
2330 | char *command = elf_tdata (abfd)->core_command; | |
2331 | int n = strlen (command); | |
2332 | ||
2333 | if (0 < n && command[n - 1] == ' ') | |
2334 | command[n - 1] = '\0'; | |
2335 | } | |
2336 | ||
2337 | return true; | |
2338 | } | |
2339 | ||
252b5132 RH |
2340 | #define TARGET_LITTLE_SYM bfd_elf32_i386_vec |
2341 | #define TARGET_LITTLE_NAME "elf32-i386" | |
2342 | #define ELF_ARCH bfd_arch_i386 | |
2343 | #define ELF_MACHINE_CODE EM_386 | |
2344 | #define ELF_MAXPAGESIZE 0x1000 | |
252b5132 RH |
2345 | |
2346 | #define elf_backend_can_gc_sections 1 | |
2347 | #define elf_backend_want_got_plt 1 | |
2348 | #define elf_backend_plt_readonly 1 | |
2349 | #define elf_backend_want_plt_sym 0 | |
2350 | #define elf_backend_got_header_size 12 | |
2351 | #define elf_backend_plt_header_size PLT_ENTRY_SIZE | |
2352 | ||
dd5724d5 AM |
2353 | #define elf_info_to_howto elf_i386_info_to_howto |
2354 | #define elf_info_to_howto_rel elf_i386_info_to_howto_rel | |
2355 | ||
dd5724d5 AM |
2356 | #define bfd_elf32_bfd_is_local_label_name elf_i386_is_local_label_name |
2357 | #define bfd_elf32_bfd_link_hash_table_create elf_i386_link_hash_table_create | |
2358 | #define bfd_elf32_bfd_reloc_type_lookup elf_i386_reloc_type_lookup | |
2359 | ||
2360 | #define elf_backend_adjust_dynamic_symbol elf_i386_adjust_dynamic_symbol | |
2361 | #define elf_backend_check_relocs elf_i386_check_relocs | |
6725bdbf | 2362 | #define elf_backend_create_dynamic_sections elf_i386_create_dynamic_sections |
dd5724d5 AM |
2363 | #define elf_backend_finish_dynamic_sections elf_i386_finish_dynamic_sections |
2364 | #define elf_backend_finish_dynamic_symbol elf_i386_finish_dynamic_symbol | |
2365 | #define elf_backend_gc_mark_hook elf_i386_gc_mark_hook | |
2366 | #define elf_backend_gc_sweep_hook elf_i386_gc_sweep_hook | |
2367 | #define elf_backend_relocate_section elf_i386_relocate_section | |
2368 | #define elf_backend_size_dynamic_sections elf_i386_size_dynamic_sections | |
83be169b | 2369 | #define elf_backend_fake_sections elf_i386_fake_sections |
c5fccbec DJ |
2370 | #define elf_backend_grok_prstatus elf_i386_grok_prstatus |
2371 | #define elf_backend_grok_psinfo elf_i386_grok_psinfo | |
db6751f2 | 2372 | #define elf_backend_reloc_type_class elf_i386_reloc_type_class |
dd5724d5 | 2373 | |
252b5132 | 2374 | #include "elf32-target.h" |