Commit | Line | Data |
---|---|---|
e4b6b3e7 | 1 | /* Intel 80386/80486-specific support for 32-bit ELF |
6e2183b1 | 2 | Copyright 1993, 1994, 1995, 1996, 1997 Free Software Foundation, Inc. |
e4b6b3e7 ILT |
3 | |
4 | This file is part of BFD, the Binary File Descriptor library. | |
5 | ||
6 | This program is free software; you can redistribute it and/or modify | |
7 | it under the terms of the GNU General Public License as published by | |
8 | the Free Software Foundation; either version 2 of the License, or | |
9 | (at your option) any later version. | |
10 | ||
11 | This program is distributed in the hope that it will be useful, | |
12 | but WITHOUT ANY WARRANTY; without even the implied warranty of | |
13 | MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the | |
14 | GNU General Public License for more details. | |
15 | ||
16 | You should have received a copy of the GNU General Public License | |
17 | along with this program; if not, write to the Free Software | |
943fbd5b | 18 | Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA. */ |
e4b6b3e7 | 19 | |
e4b6b3e7 ILT |
20 | #include "bfd.h" |
21 | #include "sysdep.h" | |
013dec1a | 22 | #include "bfdlink.h" |
e4b6b3e7 | 23 | #include "libbfd.h" |
3b3f7625 | 24 | #include "elf-bfd.h" |
e4b6b3e7 | 25 | |
30dc85f1 | 26 | static reloc_howto_type *elf_i386_reloc_type_lookup |
013dec1a ILT |
27 | PARAMS ((bfd *, bfd_reloc_code_real_type)); |
28 | static void elf_i386_info_to_howto | |
29 | PARAMS ((bfd *, arelent *, Elf32_Internal_Rela *)); | |
30 | static void elf_i386_info_to_howto_rel | |
31 | PARAMS ((bfd *, arelent *, Elf32_Internal_Rel *)); | |
6e2183b1 ILT |
32 | static boolean elf_i386_is_local_label_name PARAMS ((bfd *, const char *)); |
33 | static struct bfd_hash_entry *elf_i386_link_hash_newfunc | |
34 | PARAMS ((struct bfd_hash_entry *, struct bfd_hash_table *, const char *)); | |
35 | static struct bfd_link_hash_table *elf_i386_link_hash_table_create | |
36 | PARAMS ((bfd *)); | |
eb4267a3 ILT |
37 | static boolean elf_i386_check_relocs |
38 | PARAMS ((bfd *, struct bfd_link_info *, asection *, | |
39 | const Elf_Internal_Rela *)); | |
013dec1a ILT |
40 | static boolean elf_i386_adjust_dynamic_symbol |
41 | PARAMS ((struct bfd_link_info *, struct elf_link_hash_entry *)); | |
013dec1a ILT |
42 | static boolean elf_i386_size_dynamic_sections |
43 | PARAMS ((bfd *, struct bfd_link_info *)); | |
44 | static boolean elf_i386_relocate_section | |
45 | PARAMS ((bfd *, struct bfd_link_info *, bfd *, asection *, bfd_byte *, | |
eb4267a3 | 46 | Elf_Internal_Rela *, Elf_Internal_Sym *, asection **)); |
013dec1a ILT |
47 | static boolean elf_i386_finish_dynamic_symbol |
48 | PARAMS ((bfd *, struct bfd_link_info *, struct elf_link_hash_entry *, | |
49 | Elf_Internal_Sym *)); | |
50 | static boolean elf_i386_finish_dynamic_sections | |
51 | PARAMS ((bfd *, struct bfd_link_info *)); | |
52 | ||
e4b6b3e7 ILT |
53 | #define USE_REL 1 /* 386 uses REL relocations instead of RELA */ |
54 | ||
55 | enum reloc_type | |
56 | { | |
57 | R_386_NONE = 0, | |
68241b2b ILT |
58 | R_386_32, |
59 | R_386_PC32, | |
60 | R_386_GOT32, | |
61 | R_386_PLT32, | |
e4b6b3e7 | 62 | R_386_COPY, |
68241b2b ILT |
63 | R_386_GLOB_DAT, |
64 | R_386_JUMP_SLOT, | |
e4b6b3e7 | 65 | R_386_RELATIVE, |
68241b2b ILT |
66 | R_386_GOTOFF, |
67 | R_386_GOTPC, | |
ff12f303 ILT |
68 | FIRST_INVALID_RELOC, |
69 | LAST_INVALID_RELOC = 19, | |
70 | /* The remaining relocs are a GNU extension. */ | |
71 | R_386_16 = 20, | |
72 | R_386_PC16, | |
73 | R_386_8, | |
74 | R_386_PC8, | |
e4b6b3e7 ILT |
75 | R_386_max |
76 | }; | |
77 | ||
78 | #if 0 | |
79 | static CONST char *CONST reloc_type_names[] = | |
80 | { | |
81 | "R_386_NONE", | |
68241b2b ILT |
82 | "R_386_32", |
83 | "R_386_PC32", | |
84 | "R_386_GOT32", | |
85 | "R_386_PLT32", | |
e4b6b3e7 | 86 | "R_386_COPY", |
68241b2b ILT |
87 | "R_386_GLOB_DAT", |
88 | "R_386_JUMP_SLOT", | |
e4b6b3e7 | 89 | "R_386_RELATIVE", |
68241b2b ILT |
90 | "R_386_GOTOFF", |
91 | "R_386_GOTPC", | |
e4b6b3e7 ILT |
92 | }; |
93 | #endif | |
94 | ||
e4b6b3e7 ILT |
95 | static reloc_howto_type elf_howto_table[]= |
96 | { | |
68241b2b ILT |
97 | HOWTO(R_386_NONE, 0,0, 0,false,0,complain_overflow_bitfield, bfd_elf_generic_reloc,"R_386_NONE", true,0x00000000,0x00000000,false), |
98 | HOWTO(R_386_32, 0,2,32,false,0,complain_overflow_bitfield, bfd_elf_generic_reloc,"R_386_32", true,0xffffffff,0xffffffff,false), | |
99 | HOWTO(R_386_PC32, 0,2,32,true, 0,complain_overflow_bitfield, bfd_elf_generic_reloc,"R_386_PC32", true,0xffffffff,0xffffffff,true), | |
100 | HOWTO(R_386_GOT32, 0,2,32,false,0,complain_overflow_bitfield, bfd_elf_generic_reloc,"R_386_GOT32", true,0xffffffff,0xffffffff,false), | |
eb4267a3 | 101 | HOWTO(R_386_PLT32, 0,2,32,true,0,complain_overflow_bitfield, bfd_elf_generic_reloc,"R_386_PLT32", true,0xffffffff,0xffffffff,true), |
68241b2b ILT |
102 | HOWTO(R_386_COPY, 0,2,32,false,0,complain_overflow_bitfield, bfd_elf_generic_reloc,"R_386_COPY", true,0xffffffff,0xffffffff,false), |
103 | HOWTO(R_386_GLOB_DAT, 0,2,32,false,0,complain_overflow_bitfield, bfd_elf_generic_reloc,"R_386_GLOB_DAT", true,0xffffffff,0xffffffff,false), | |
104 | HOWTO(R_386_JUMP_SLOT, 0,2,32,false,0,complain_overflow_bitfield, bfd_elf_generic_reloc,"R_386_JUMP_SLOT",true,0xffffffff,0xffffffff,false), | |
105 | HOWTO(R_386_RELATIVE, 0,2,32,false,0,complain_overflow_bitfield, bfd_elf_generic_reloc,"R_386_RELATIVE", true,0xffffffff,0xffffffff,false), | |
106 | HOWTO(R_386_GOTOFF, 0,2,32,false,0,complain_overflow_bitfield, bfd_elf_generic_reloc,"R_386_GOTOFF", true,0xffffffff,0xffffffff,false), | |
eb4267a3 | 107 | HOWTO(R_386_GOTPC, 0,2,32,true,0,complain_overflow_bitfield, bfd_elf_generic_reloc,"R_386_GOTPC", true,0xffffffff,0xffffffff,true), |
ff12f303 ILT |
108 | { 11 }, |
109 | { 12 }, | |
110 | { 13 }, | |
111 | { 14 }, | |
112 | { 15 }, | |
113 | { 16 }, | |
114 | { 17 }, | |
115 | { 18 }, | |
116 | { 19 }, | |
117 | /* The remaining relocs are a GNU extension. */ | |
118 | HOWTO(R_386_16, 0,1,16,false,0,complain_overflow_bitfield, bfd_elf_generic_reloc,"R_386_16", true,0xffff,0xffff,false), | |
119 | HOWTO(R_386_PC16, 0,1,16,true, 0,complain_overflow_bitfield, bfd_elf_generic_reloc,"R_386_PC16", true,0xffff,0xffff,true), | |
120 | HOWTO(R_386_8, 0,0,8,false,0,complain_overflow_bitfield, bfd_elf_generic_reloc,"R_386_8", true,0xff,0xff,false), | |
121 | HOWTO(R_386_PC8, 0,0,8,true, 0,complain_overflow_bitfield, bfd_elf_generic_reloc,"R_386_PC8", true,0xff,0xff,true), | |
e4b6b3e7 ILT |
122 | }; |
123 | ||
124 | #ifdef DEBUG_GEN_RELOC | |
125 | #define TRACE(str) fprintf (stderr, "i386 bfd reloc lookup %d (%s)\n", code, str) | |
126 | #else | |
127 | #define TRACE(str) | |
128 | #endif | |
129 | ||
30dc85f1 | 130 | static reloc_howto_type * |
013dec1a ILT |
131 | elf_i386_reloc_type_lookup (abfd, code) |
132 | bfd *abfd; | |
133 | bfd_reloc_code_real_type code; | |
e4b6b3e7 ILT |
134 | { |
135 | switch (code) | |
136 | { | |
137 | case BFD_RELOC_NONE: | |
138 | TRACE ("BFD_RELOC_NONE"); | |
139 | return &elf_howto_table[ (int)R_386_NONE ]; | |
140 | ||
141 | case BFD_RELOC_32: | |
142 | TRACE ("BFD_RELOC_32"); | |
143 | return &elf_howto_table[ (int)R_386_32 ]; | |
144 | ||
145 | case BFD_RELOC_32_PCREL: | |
146 | TRACE ("BFD_RELOC_PC32"); | |
147 | return &elf_howto_table[ (int)R_386_PC32 ]; | |
148 | ||
68241b2b ILT |
149 | case BFD_RELOC_386_GOT32: |
150 | TRACE ("BFD_RELOC_386_GOT32"); | |
151 | return &elf_howto_table[ (int)R_386_GOT32 ]; | |
152 | ||
153 | case BFD_RELOC_386_PLT32: | |
154 | TRACE ("BFD_RELOC_386_PLT32"); | |
155 | return &elf_howto_table[ (int)R_386_PLT32 ]; | |
156 | ||
157 | case BFD_RELOC_386_COPY: | |
158 | TRACE ("BFD_RELOC_386_COPY"); | |
159 | return &elf_howto_table[ (int)R_386_COPY ]; | |
160 | ||
161 | case BFD_RELOC_386_GLOB_DAT: | |
162 | TRACE ("BFD_RELOC_386_GLOB_DAT"); | |
163 | return &elf_howto_table[ (int)R_386_GLOB_DAT ]; | |
164 | ||
165 | case BFD_RELOC_386_JUMP_SLOT: | |
166 | TRACE ("BFD_RELOC_386_JUMP_SLOT"); | |
167 | return &elf_howto_table[ (int)R_386_JUMP_SLOT ]; | |
168 | ||
169 | case BFD_RELOC_386_RELATIVE: | |
170 | TRACE ("BFD_RELOC_386_RELATIVE"); | |
171 | return &elf_howto_table[ (int)R_386_RELATIVE ]; | |
172 | ||
173 | case BFD_RELOC_386_GOTOFF: | |
174 | TRACE ("BFD_RELOC_386_GOTOFF"); | |
175 | return &elf_howto_table[ (int)R_386_GOTOFF ]; | |
176 | ||
177 | case BFD_RELOC_386_GOTPC: | |
178 | TRACE ("BFD_RELOC_386_GOTPC"); | |
179 | return &elf_howto_table[ (int)R_386_GOTPC ]; | |
180 | ||
ff12f303 ILT |
181 | /* The remaining relocs are a GNU extension. */ |
182 | case BFD_RELOC_16: | |
183 | TRACE ("BFD_RELOC_16"); | |
184 | return &elf_howto_table[(int) R_386_16]; | |
185 | ||
186 | case BFD_RELOC_16_PCREL: | |
187 | TRACE ("BFD_RELOC_16_PCREL"); | |
188 | return &elf_howto_table[(int) R_386_PC16]; | |
189 | ||
190 | case BFD_RELOC_8: | |
191 | TRACE ("BFD_RELOC_8"); | |
192 | return &elf_howto_table[(int) R_386_8]; | |
193 | ||
194 | case BFD_RELOC_8_PCREL: | |
195 | TRACE ("BFD_RELOC_8_PCREL"); | |
196 | return &elf_howto_table[(int) R_386_PC8]; | |
197 | ||
e4b6b3e7 | 198 | default: |
68241b2b | 199 | break; |
e4b6b3e7 ILT |
200 | } |
201 | ||
202 | TRACE ("Unknown"); | |
203 | return 0; | |
204 | } | |
205 | ||
206 | static void | |
013dec1a ILT |
207 | elf_i386_info_to_howto (abfd, cache_ptr, dst) |
208 | bfd *abfd; | |
209 | arelent *cache_ptr; | |
210 | Elf32_Internal_Rela *dst; | |
e4b6b3e7 | 211 | { |
ff12f303 | 212 | abort (); |
e4b6b3e7 ILT |
213 | } |
214 | ||
215 | static void | |
013dec1a | 216 | elf_i386_info_to_howto_rel (abfd, cache_ptr, dst) |
ff12f303 ILT |
217 | bfd *abfd; |
218 | arelent *cache_ptr; | |
013dec1a | 219 | Elf32_Internal_Rel *dst; |
e4b6b3e7 | 220 | { |
ff12f303 ILT |
221 | enum reloc_type type; |
222 | ||
223 | type = (enum reloc_type) ELF32_R_TYPE (dst->r_info); | |
224 | BFD_ASSERT (type < R_386_max); | |
225 | BFD_ASSERT (type < FIRST_INVALID_RELOC || type > LAST_INVALID_RELOC); | |
e4b6b3e7 | 226 | |
ff12f303 | 227 | cache_ptr->howto = &elf_howto_table[(int) type]; |
e4b6b3e7 | 228 | } |
6e2183b1 ILT |
229 | |
230 | /* Return whether a symbol name implies a local label. The UnixWare | |
231 | 2.1 cc generates temporary symbols that start with .X, so we | |
232 | recognize them here. FIXME: do other SVR4 compilers also use .X?. | |
233 | If so, we should move the .X recognition into | |
234 | _bfd_elf_is_local_label_name. */ | |
235 | ||
236 | static boolean | |
237 | elf_i386_is_local_label_name (abfd, name) | |
238 | bfd *abfd; | |
239 | const char *name; | |
240 | { | |
241 | if (name[0] == '.' && name[1] == 'X') | |
242 | return true; | |
243 | ||
244 | return _bfd_elf_is_local_label_name (abfd, name); | |
245 | } | |
013dec1a ILT |
246 | \f |
247 | /* Functions for the i386 ELF linker. */ | |
248 | ||
249 | /* The name of the dynamic interpreter. This is put in the .interp | |
250 | section. */ | |
251 | ||
252 | #define ELF_DYNAMIC_INTERPRETER "/usr/lib/libc.so.1" | |
253 | ||
254 | /* The size in bytes of an entry in the procedure linkage table. */ | |
255 | ||
256 | #define PLT_ENTRY_SIZE 16 | |
257 | ||
258 | /* The first entry in an absolute procedure linkage table looks like | |
259 | this. See the SVR4 ABI i386 supplement to see how this works. */ | |
260 | ||
89f7a04c | 261 | static const bfd_byte elf_i386_plt0_entry[PLT_ENTRY_SIZE] = |
013dec1a ILT |
262 | { |
263 | 0xff, 0x35, /* pushl contents of address */ | |
264 | 0, 0, 0, 0, /* replaced with address of .got + 4. */ | |
265 | 0xff, 0x25, /* jmp indirect */ | |
266 | 0, 0, 0, 0, /* replaced with address of .got + 8. */ | |
267 | 0, 0, 0, 0 /* pad out to 16 bytes. */ | |
268 | }; | |
269 | ||
270 | /* Subsequent entries in an absolute procedure linkage table look like | |
271 | this. */ | |
272 | ||
89f7a04c | 273 | static const bfd_byte elf_i386_plt_entry[PLT_ENTRY_SIZE] = |
013dec1a ILT |
274 | { |
275 | 0xff, 0x25, /* jmp indirect */ | |
276 | 0, 0, 0, 0, /* replaced with address of this symbol in .got. */ | |
277 | 0x68, /* pushl immediate */ | |
278 | 0, 0, 0, 0, /* replaced with offset into relocation table. */ | |
279 | 0xe9, /* jmp relative */ | |
280 | 0, 0, 0, 0 /* replaced with offset to start of .plt. */ | |
281 | }; | |
282 | ||
eb4267a3 ILT |
283 | /* The first entry in a PIC procedure linkage table look like this. */ |
284 | ||
89f7a04c | 285 | static const bfd_byte elf_i386_pic_plt0_entry[PLT_ENTRY_SIZE] = |
eb4267a3 | 286 | { |
ff12f303 ILT |
287 | 0xff, 0xb3, 4, 0, 0, 0, /* pushl 4(%ebx) */ |
288 | 0xff, 0xa3, 8, 0, 0, 0, /* jmp *8(%ebx) */ | |
eb4267a3 ILT |
289 | 0, 0, 0, 0 /* pad out to 16 bytes. */ |
290 | }; | |
291 | ||
292 | /* Subsequent entries in a PIC procedure linkage table look like this. */ | |
293 | ||
89f7a04c | 294 | static const bfd_byte elf_i386_pic_plt_entry[PLT_ENTRY_SIZE] = |
eb4267a3 ILT |
295 | { |
296 | 0xff, 0xa3, /* jmp *offset(%ebx) */ | |
297 | 0, 0, 0, 0, /* replaced with offset of this symbol in .got. */ | |
298 | 0x68, /* pushl immediate */ | |
299 | 0, 0, 0, 0, /* replaced with offset into relocation table. */ | |
300 | 0xe9, /* jmp relative */ | |
301 | 0, 0, 0, 0 /* replaced with offset to start of .plt. */ | |
302 | }; | |
303 | ||
6e2183b1 ILT |
304 | /* The i386 linker needs to keep track of the number of relocs that it |
305 | decides to copy in check_relocs for each symbol. This is so that | |
306 | it can discard PC relative relocs if it doesn't need them when | |
307 | linking with -Bsymbolic. We store the information in a field | |
308 | extending the regular ELF linker hash table. */ | |
309 | ||
310 | /* This structure keeps track of the number of PC relative relocs we | |
311 | have copied for a given symbol. */ | |
312 | ||
313 | struct elf_i386_pcrel_relocs_copied | |
314 | { | |
315 | /* Next section. */ | |
316 | struct elf_i386_pcrel_relocs_copied *next; | |
317 | /* A section in dynobj. */ | |
318 | asection *section; | |
319 | /* Number of relocs copied in this section. */ | |
320 | bfd_size_type count; | |
321 | }; | |
322 | ||
323 | /* i386 ELF linker hash entry. */ | |
324 | ||
325 | struct elf_i386_link_hash_entry | |
326 | { | |
327 | struct elf_link_hash_entry root; | |
328 | ||
329 | /* Number of PC relative relocs copied for this symbol. */ | |
330 | struct elf_i386_pcrel_relocs_copied *pcrel_relocs_copied; | |
331 | }; | |
332 | ||
333 | /* i386 ELF linker hash table. */ | |
334 | ||
335 | struct elf_i386_link_hash_table | |
336 | { | |
337 | struct elf_link_hash_table root; | |
338 | }; | |
339 | ||
340 | /* Declare this now that the above structures are defined. */ | |
341 | ||
342 | static boolean elf_i386_discard_copies | |
343 | PARAMS ((struct elf_i386_link_hash_entry *, PTR)); | |
344 | ||
345 | /* Traverse an i386 ELF linker hash table. */ | |
346 | ||
347 | #define elf_i386_link_hash_traverse(table, func, info) \ | |
348 | (elf_link_hash_traverse \ | |
349 | (&(table)->root, \ | |
350 | (boolean (*) PARAMS ((struct elf_link_hash_entry *, PTR))) (func), \ | |
351 | (info))) | |
352 | ||
353 | /* Get the i386 ELF linker hash table from a link_info structure. */ | |
354 | ||
355 | #define elf_i386_hash_table(p) \ | |
356 | ((struct elf_i386_link_hash_table *) ((p)->hash)) | |
357 | ||
358 | /* Create an entry in an i386 ELF linker hash table. */ | |
359 | ||
360 | static struct bfd_hash_entry * | |
361 | elf_i386_link_hash_newfunc (entry, table, string) | |
362 | struct bfd_hash_entry *entry; | |
363 | struct bfd_hash_table *table; | |
364 | const char *string; | |
365 | { | |
366 | struct elf_i386_link_hash_entry *ret = | |
367 | (struct elf_i386_link_hash_entry *) entry; | |
368 | ||
369 | /* Allocate the structure if it has not already been allocated by a | |
370 | subclass. */ | |
371 | if (ret == (struct elf_i386_link_hash_entry *) NULL) | |
372 | ret = ((struct elf_i386_link_hash_entry *) | |
373 | bfd_hash_allocate (table, | |
374 | sizeof (struct elf_i386_link_hash_entry))); | |
375 | if (ret == (struct elf_i386_link_hash_entry *) NULL) | |
376 | return (struct bfd_hash_entry *) ret; | |
377 | ||
378 | /* Call the allocation method of the superclass. */ | |
379 | ret = ((struct elf_i386_link_hash_entry *) | |
380 | _bfd_elf_link_hash_newfunc ((struct bfd_hash_entry *) ret, | |
381 | table, string)); | |
382 | if (ret != (struct elf_i386_link_hash_entry *) NULL) | |
383 | { | |
384 | ret->pcrel_relocs_copied = NULL; | |
385 | } | |
386 | ||
387 | return (struct bfd_hash_entry *) ret; | |
388 | } | |
389 | ||
390 | /* Create an i386 ELF linker hash table. */ | |
391 | ||
392 | static struct bfd_link_hash_table * | |
393 | elf_i386_link_hash_table_create (abfd) | |
394 | bfd *abfd; | |
395 | { | |
396 | struct elf_i386_link_hash_table *ret; | |
397 | ||
398 | ret = ((struct elf_i386_link_hash_table *) | |
399 | bfd_alloc (abfd, sizeof (struct elf_i386_link_hash_table))); | |
400 | if (ret == (struct elf_i386_link_hash_table *) NULL) | |
401 | return NULL; | |
402 | ||
403 | if (! _bfd_elf_link_hash_table_init (&ret->root, abfd, | |
404 | elf_i386_link_hash_newfunc)) | |
405 | { | |
406 | bfd_release (abfd, ret); | |
407 | return NULL; | |
408 | } | |
409 | ||
410 | return &ret->root.root; | |
411 | } | |
412 | ||
eb4267a3 ILT |
413 | /* Look through the relocs for a section during the first phase, and |
414 | allocate space in the global offset table or procedure linkage | |
415 | table. */ | |
416 | ||
417 | static boolean | |
418 | elf_i386_check_relocs (abfd, info, sec, relocs) | |
419 | bfd *abfd; | |
420 | struct bfd_link_info *info; | |
421 | asection *sec; | |
422 | const Elf_Internal_Rela *relocs; | |
423 | { | |
424 | bfd *dynobj; | |
425 | Elf_Internal_Shdr *symtab_hdr; | |
426 | struct elf_link_hash_entry **sym_hashes; | |
427 | bfd_vma *local_got_offsets; | |
428 | const Elf_Internal_Rela *rel; | |
429 | const Elf_Internal_Rela *rel_end; | |
430 | asection *sgot; | |
431 | asection *srelgot; | |
eb4267a3 ILT |
432 | asection *sreloc; |
433 | ||
434 | if (info->relocateable) | |
435 | return true; | |
436 | ||
437 | dynobj = elf_hash_table (info)->dynobj; | |
438 | symtab_hdr = &elf_tdata (abfd)->symtab_hdr; | |
439 | sym_hashes = elf_sym_hashes (abfd); | |
440 | local_got_offsets = elf_local_got_offsets (abfd); | |
441 | ||
442 | sgot = NULL; | |
443 | srelgot = NULL; | |
eb4267a3 ILT |
444 | sreloc = NULL; |
445 | ||
446 | rel_end = relocs + sec->reloc_count; | |
447 | for (rel = relocs; rel < rel_end; rel++) | |
448 | { | |
3b3f7625 | 449 | unsigned long r_symndx; |
eb4267a3 ILT |
450 | struct elf_link_hash_entry *h; |
451 | ||
452 | r_symndx = ELF32_R_SYM (rel->r_info); | |
453 | ||
454 | if (r_symndx < symtab_hdr->sh_info) | |
455 | h = NULL; | |
456 | else | |
457 | h = sym_hashes[r_symndx - symtab_hdr->sh_info]; | |
458 | ||
12662be4 | 459 | /* Some relocs require a global offset table. */ |
eb4267a3 ILT |
460 | if (dynobj == NULL) |
461 | { | |
462 | switch (ELF32_R_TYPE (rel->r_info)) | |
463 | { | |
464 | case R_386_GOT32: | |
eb4267a3 ILT |
465 | case R_386_GOTOFF: |
466 | case R_386_GOTPC: | |
467 | elf_hash_table (info)->dynobj = dynobj = abfd; | |
ede4eed4 | 468 | if (! _bfd_elf_create_got_section (dynobj, info)) |
eb4267a3 ILT |
469 | return false; |
470 | break; | |
471 | ||
472 | default: | |
473 | break; | |
474 | } | |
475 | } | |
476 | ||
477 | switch (ELF32_R_TYPE (rel->r_info)) | |
478 | { | |
479 | case R_386_GOT32: | |
480 | /* This symbol requires a global offset table entry. */ | |
ff12f303 | 481 | |
eb4267a3 ILT |
482 | if (sgot == NULL) |
483 | { | |
484 | sgot = bfd_get_section_by_name (dynobj, ".got"); | |
12662be4 ILT |
485 | BFD_ASSERT (sgot != NULL); |
486 | } | |
487 | ||
488 | if (srelgot == NULL | |
489 | && (h != NULL || info->shared)) | |
490 | { | |
eb4267a3 ILT |
491 | srelgot = bfd_get_section_by_name (dynobj, ".rel.got"); |
492 | if (srelgot == NULL) | |
493 | { | |
494 | srelgot = bfd_make_section (dynobj, ".rel.got"); | |
495 | if (srelgot == NULL | |
496 | || ! bfd_set_section_flags (dynobj, srelgot, | |
497 | (SEC_ALLOC | |
498 | | SEC_LOAD | |
499 | | SEC_HAS_CONTENTS | |
500 | | SEC_IN_MEMORY | |
ff12f303 | 501 | | SEC_LINKER_CREATED |
eb4267a3 ILT |
502 | | SEC_READONLY)) |
503 | || ! bfd_set_section_alignment (dynobj, srelgot, 2)) | |
504 | return false; | |
505 | } | |
eb4267a3 ILT |
506 | } |
507 | ||
508 | if (h != NULL) | |
509 | { | |
510 | if (h->got_offset != (bfd_vma) -1) | |
511 | { | |
512 | /* We have already allocated space in the .got. */ | |
513 | break; | |
514 | } | |
515 | h->got_offset = sgot->_raw_size; | |
516 | ||
517 | /* Make sure this symbol is output as a dynamic symbol. */ | |
518 | if (h->dynindx == -1) | |
519 | { | |
520 | if (! bfd_elf32_link_record_dynamic_symbol (info, h)) | |
521 | return false; | |
522 | } | |
12662be4 ILT |
523 | |
524 | srelgot->_raw_size += sizeof (Elf32_External_Rel); | |
eb4267a3 ILT |
525 | } |
526 | else | |
527 | { | |
528 | /* This is a global offset table entry for a local | |
529 | symbol. */ | |
530 | if (local_got_offsets == NULL) | |
531 | { | |
532 | size_t size; | |
3b3f7625 | 533 | register unsigned int i; |
eb4267a3 ILT |
534 | |
535 | size = symtab_hdr->sh_info * sizeof (bfd_vma); | |
536 | local_got_offsets = (bfd_vma *) bfd_alloc (abfd, size); | |
537 | if (local_got_offsets == NULL) | |
3c38b3df | 538 | return false; |
eb4267a3 ILT |
539 | elf_local_got_offsets (abfd) = local_got_offsets; |
540 | for (i = 0; i < symtab_hdr->sh_info; i++) | |
541 | local_got_offsets[i] = (bfd_vma) -1; | |
542 | } | |
543 | if (local_got_offsets[r_symndx] != (bfd_vma) -1) | |
544 | { | |
545 | /* We have already allocated space in the .got. */ | |
546 | break; | |
547 | } | |
548 | local_got_offsets[r_symndx] = sgot->_raw_size; | |
12662be4 ILT |
549 | |
550 | if (info->shared) | |
551 | { | |
552 | /* If we are generating a shared object, we need to | |
553 | output a R_386_RELATIVE reloc so that the dynamic | |
554 | linker can adjust this GOT entry. */ | |
555 | srelgot->_raw_size += sizeof (Elf32_External_Rel); | |
556 | } | |
eb4267a3 ILT |
557 | } |
558 | ||
559 | sgot->_raw_size += 4; | |
eb4267a3 ILT |
560 | |
561 | break; | |
562 | ||
563 | case R_386_PLT32: | |
12662be4 ILT |
564 | /* This symbol requires a procedure linkage table entry. We |
565 | actually build the entry in adjust_dynamic_symbol, | |
ff12f303 ILT |
566 | because this might be a case of linking PIC code which is |
567 | never referenced by a dynamic object, in which case we | |
568 | don't need to generate a procedure linkage table entry | |
569 | after all. */ | |
570 | ||
eb4267a3 ILT |
571 | /* If this is a local symbol, we resolve it directly without |
572 | creating a procedure linkage table entry. */ | |
573 | if (h == NULL) | |
574 | continue; | |
575 | ||
12662be4 | 576 | h->elf_link_hash_flags |= ELF_LINK_HASH_NEEDS_PLT; |
eb4267a3 ILT |
577 | |
578 | break; | |
579 | ||
580 | case R_386_32: | |
581 | case R_386_PC32: | |
6e2183b1 ILT |
582 | /* If we are creating a shared library, and this is a reloc |
583 | against a global symbol, or a non PC relative reloc | |
584 | against a local symbol, then we need to copy the reloc | |
585 | into the shared library. However, if we are linking with | |
586 | -Bsymbolic, we do not need to copy a reloc against a | |
587 | global symbol which is defined in an object we are | |
588 | including in the link (i.e., DEF_REGULAR is set). At | |
589 | this point we have not seen all the input files, so it is | |
590 | possible that DEF_REGULAR is not set now but will be set | |
591 | later (it is never cleared). We account for that | |
592 | possibility below by storing information in the | |
593 | pcrel_relocs_copied field of the hash table entry. */ | |
eb4267a3 | 594 | if (info->shared |
6e2183b1 ILT |
595 | && (ELF32_R_TYPE (rel->r_info) != R_386_PC32 |
596 | || (h != NULL | |
597 | && (! info->symbolic | |
598 | || (h->elf_link_hash_flags | |
599 | & ELF_LINK_HASH_DEF_REGULAR) == 0)))) | |
eb4267a3 | 600 | { |
14cac507 ILT |
601 | /* When creating a shared object, we must copy these |
602 | reloc types into the output file. We create a reloc | |
603 | section in dynobj and make room for this reloc. */ | |
eb4267a3 ILT |
604 | if (sreloc == NULL) |
605 | { | |
606 | const char *name; | |
607 | ||
ede4eed4 | 608 | name = (bfd_elf_string_from_elf_section |
eb4267a3 ILT |
609 | (abfd, |
610 | elf_elfheader (abfd)->e_shstrndx, | |
611 | elf_section_data (sec)->rel_hdr.sh_name)); | |
612 | if (name == NULL) | |
613 | return false; | |
614 | ||
615 | BFD_ASSERT (strncmp (name, ".rel", 4) == 0 | |
616 | && strcmp (bfd_get_section_name (abfd, sec), | |
617 | name + 4) == 0); | |
618 | ||
619 | sreloc = bfd_get_section_by_name (dynobj, name); | |
620 | if (sreloc == NULL) | |
621 | { | |
ff12f303 ILT |
622 | flagword flags; |
623 | ||
eb4267a3 | 624 | sreloc = bfd_make_section (dynobj, name); |
ff12f303 ILT |
625 | flags = (SEC_HAS_CONTENTS | SEC_READONLY |
626 | | SEC_IN_MEMORY | SEC_LINKER_CREATED); | |
627 | if ((sec->flags & SEC_ALLOC) != 0) | |
628 | flags |= SEC_ALLOC | SEC_LOAD; | |
eb4267a3 | 629 | if (sreloc == NULL |
ff12f303 | 630 | || ! bfd_set_section_flags (dynobj, sreloc, flags) |
eb4267a3 ILT |
631 | || ! bfd_set_section_alignment (dynobj, sreloc, 2)) |
632 | return false; | |
633 | } | |
634 | } | |
635 | ||
636 | sreloc->_raw_size += sizeof (Elf32_External_Rel); | |
6e2183b1 ILT |
637 | |
638 | /* If we are linking with -Bsymbolic, and this is a | |
639 | global symbol, we count the number of PC relative | |
640 | relocations we have entered for this symbol, so that | |
641 | we can discard them again if the symbol is later | |
642 | defined by a regular object. Note that this function | |
643 | is only called if we are using an elf_i386 linker | |
644 | hash table, which means that h is really a pointer to | |
645 | an elf_i386_link_hash_entry. */ | |
6a1878c9 ILT |
646 | if (h != NULL && info->symbolic |
647 | && ELF32_R_TYPE (rel->r_info) == R_386_PC32) | |
6e2183b1 ILT |
648 | { |
649 | struct elf_i386_link_hash_entry *eh; | |
650 | struct elf_i386_pcrel_relocs_copied *p; | |
651 | ||
652 | eh = (struct elf_i386_link_hash_entry *) h; | |
653 | ||
654 | for (p = eh->pcrel_relocs_copied; p != NULL; p = p->next) | |
655 | if (p->section == sreloc) | |
656 | break; | |
657 | ||
658 | if (p == NULL) | |
659 | { | |
660 | p = ((struct elf_i386_pcrel_relocs_copied *) | |
661 | bfd_alloc (dynobj, sizeof *p)); | |
662 | if (p == NULL) | |
663 | return false; | |
664 | p->next = eh->pcrel_relocs_copied; | |
665 | eh->pcrel_relocs_copied = p; | |
666 | p->section = sreloc; | |
667 | p->count = 0; | |
668 | } | |
669 | ||
670 | ++p->count; | |
671 | } | |
eb4267a3 | 672 | } |
ff12f303 | 673 | |
eb4267a3 ILT |
674 | break; |
675 | ||
676 | default: | |
677 | break; | |
678 | } | |
679 | } | |
013dec1a ILT |
680 | |
681 | return true; | |
682 | } | |
683 | ||
684 | /* Adjust a symbol defined by a dynamic object and referenced by a | |
685 | regular object. The current definition is in some section of the | |
686 | dynamic object, but we're not including those sections. We have to | |
687 | change the definition to something the rest of the link can | |
688 | understand. */ | |
689 | ||
690 | static boolean | |
691 | elf_i386_adjust_dynamic_symbol (info, h) | |
692 | struct bfd_link_info *info; | |
693 | struct elf_link_hash_entry *h; | |
694 | { | |
695 | bfd *dynobj; | |
696 | asection *s; | |
697 | unsigned int power_of_two; | |
013dec1a ILT |
698 | |
699 | dynobj = elf_hash_table (info)->dynobj; | |
700 | ||
701 | /* Make sure we know what is going on here. */ | |
3004a68c ILT |
702 | BFD_ASSERT (dynobj != NULL |
703 | && ((h->elf_link_hash_flags & ELF_LINK_HASH_NEEDS_PLT) | |
452a5efb | 704 | || h->weakdef != NULL |
3004a68c ILT |
705 | || ((h->elf_link_hash_flags |
706 | & ELF_LINK_HASH_DEF_DYNAMIC) != 0 | |
707 | && (h->elf_link_hash_flags | |
708 | & ELF_LINK_HASH_REF_REGULAR) != 0 | |
709 | && (h->elf_link_hash_flags | |
710 | & ELF_LINK_HASH_DEF_REGULAR) == 0))); | |
013dec1a ILT |
711 | |
712 | /* If this is a function, put it in the procedure linkage table. We | |
713 | will fill in the contents of the procedure linkage table later, | |
714 | when we know the address of the .got section. */ | |
12662be4 ILT |
715 | if (h->type == STT_FUNC |
716 | || (h->elf_link_hash_flags & ELF_LINK_HASH_NEEDS_PLT) != 0) | |
013dec1a | 717 | { |
ff12f303 ILT |
718 | if (! info->shared |
719 | && (h->elf_link_hash_flags & ELF_LINK_HASH_DEF_DYNAMIC) == 0 | |
720 | && (h->elf_link_hash_flags & ELF_LINK_HASH_REF_DYNAMIC) == 0) | |
12662be4 ILT |
721 | { |
722 | /* This case can occur if we saw a PLT32 reloc in an input | |
ff12f303 ILT |
723 | file, but the symbol was never referred to by a dynamic |
724 | object. In such a case, we don't actually need to build | |
725 | a procedure linkage table, and we can just do a PC32 | |
726 | reloc instead. */ | |
12662be4 ILT |
727 | BFD_ASSERT ((h->elf_link_hash_flags & ELF_LINK_HASH_NEEDS_PLT) != 0); |
728 | return true; | |
729 | } | |
730 | ||
ff12f303 ILT |
731 | /* Make sure this symbol is output as a dynamic symbol. */ |
732 | if (h->dynindx == -1) | |
733 | { | |
734 | if (! bfd_elf32_link_record_dynamic_symbol (info, h)) | |
735 | return false; | |
736 | } | |
737 | ||
013dec1a ILT |
738 | s = bfd_get_section_by_name (dynobj, ".plt"); |
739 | BFD_ASSERT (s != NULL); | |
740 | ||
12662be4 ILT |
741 | /* If this is the first .plt entry, make room for the special |
742 | first entry. */ | |
743 | if (s->_raw_size == 0) | |
744 | s->_raw_size += PLT_ENTRY_SIZE; | |
013dec1a | 745 | |
9b09a015 ILT |
746 | /* If this symbol is not defined in a regular file, and we are |
747 | not generating a shared library, then set the symbol to this | |
748 | location in the .plt. This is required to make function | |
749 | pointers compare as equal between the normal executable and | |
750 | the shared library. */ | |
751 | if (! info->shared | |
752 | && (h->elf_link_hash_flags & ELF_LINK_HASH_DEF_REGULAR) == 0) | |
14cac507 ILT |
753 | { |
754 | h->root.u.def.section = s; | |
755 | h->root.u.def.value = s->_raw_size; | |
756 | } | |
013dec1a | 757 | |
12662be4 | 758 | h->plt_offset = s->_raw_size; |
013dec1a | 759 | |
12662be4 ILT |
760 | /* Make room for this entry. */ |
761 | s->_raw_size += PLT_ENTRY_SIZE; | |
013dec1a | 762 | |
12662be4 ILT |
763 | /* We also need to make an entry in the .got.plt section, which |
764 | will be placed in the .got section by the linker script. */ | |
013dec1a | 765 | |
12662be4 ILT |
766 | s = bfd_get_section_by_name (dynobj, ".got.plt"); |
767 | BFD_ASSERT (s != NULL); | |
768 | s->_raw_size += 4; | |
013dec1a | 769 | |
12662be4 | 770 | /* We also need to make an entry in the .rel.plt section. */ |
eb4267a3 | 771 | |
12662be4 ILT |
772 | s = bfd_get_section_by_name (dynobj, ".rel.plt"); |
773 | BFD_ASSERT (s != NULL); | |
774 | s->_raw_size += sizeof (Elf32_External_Rel); | |
013dec1a ILT |
775 | |
776 | return true; | |
777 | } | |
778 | ||
779 | /* If this is a weak symbol, and there is a real definition, the | |
780 | processor independent code will have arranged for us to see the | |
781 | real definition first, and we can just use the same value. */ | |
782 | if (h->weakdef != NULL) | |
783 | { | |
30dc85f1 ILT |
784 | BFD_ASSERT (h->weakdef->root.type == bfd_link_hash_defined |
785 | || h->weakdef->root.type == bfd_link_hash_defweak); | |
013dec1a ILT |
786 | h->root.u.def.section = h->weakdef->root.u.def.section; |
787 | h->root.u.def.value = h->weakdef->root.u.def.value; | |
013dec1a ILT |
788 | return true; |
789 | } | |
790 | ||
791 | /* This is a reference to a symbol defined by a dynamic object which | |
eb4267a3 ILT |
792 | is not a function. */ |
793 | ||
794 | /* If we are creating a shared library, we must presume that the | |
795 | only references to the symbol are via the global offset table. | |
796 | For such cases we need not do anything here; the relocations will | |
797 | be handled correctly by relocate_section. */ | |
798 | if (info->shared) | |
799 | return true; | |
800 | ||
801 | /* We must allocate the symbol in our .dynbss section, which will | |
802 | become part of the .bss section of the executable. There will be | |
803 | an entry for this symbol in the .dynsym section. The dynamic | |
804 | object will contain position independent code, so all references | |
805 | from the dynamic object to this symbol will go through the global | |
806 | offset table. The dynamic linker will use the .dynsym entry to | |
807 | determine the address it must put in the global offset table, so | |
808 | both the dynamic object and the regular object will refer to the | |
809 | same memory location for the variable. */ | |
013dec1a ILT |
810 | |
811 | s = bfd_get_section_by_name (dynobj, ".dynbss"); | |
812 | BFD_ASSERT (s != NULL); | |
813 | ||
6e2183b1 ILT |
814 | /* We must generate a R_386_COPY reloc to tell the dynamic linker to |
815 | copy the initial value out of the dynamic object and into the | |
816 | runtime process image. We need to remember the offset into the | |
817 | .rel.bss section we are going to use. */ | |
818 | if ((h->root.u.def.section->flags & SEC_ALLOC) != 0) | |
013dec1a ILT |
819 | { |
820 | asection *srel; | |
821 | ||
822 | srel = bfd_get_section_by_name (dynobj, ".rel.bss"); | |
823 | BFD_ASSERT (srel != NULL); | |
013dec1a | 824 | srel->_raw_size += sizeof (Elf32_External_Rel); |
eb4267a3 | 825 | h->elf_link_hash_flags |= ELF_LINK_HASH_NEEDS_COPY; |
013dec1a ILT |
826 | } |
827 | ||
828 | /* We need to figure out the alignment required for this symbol. I | |
829 | have no idea how ELF linkers handle this. */ | |
7c6da9ca ILT |
830 | power_of_two = bfd_log2 (h->size); |
831 | if (power_of_two > 3) | |
832 | power_of_two = 3; | |
013dec1a ILT |
833 | |
834 | /* Apply the required alignment. */ | |
7c6da9ca ILT |
835 | s->_raw_size = BFD_ALIGN (s->_raw_size, |
836 | (bfd_size_type) (1 << power_of_two)); | |
013dec1a ILT |
837 | if (power_of_two > bfd_get_section_alignment (dynobj, s)) |
838 | { | |
839 | if (! bfd_set_section_alignment (dynobj, s, power_of_two)) | |
840 | return false; | |
841 | } | |
842 | ||
843 | /* Define the symbol as being at this point in the section. */ | |
844 | h->root.u.def.section = s; | |
845 | h->root.u.def.value = s->_raw_size; | |
846 | ||
847 | /* Increment the section size to make room for the symbol. */ | |
848 | s->_raw_size += h->size; | |
849 | ||
850 | return true; | |
851 | } | |
852 | ||
013dec1a ILT |
853 | /* Set the sizes of the dynamic sections. */ |
854 | ||
855 | static boolean | |
856 | elf_i386_size_dynamic_sections (output_bfd, info) | |
857 | bfd *output_bfd; | |
858 | struct bfd_link_info *info; | |
859 | { | |
860 | bfd *dynobj; | |
861 | asection *s; | |
eb4267a3 ILT |
862 | boolean plt; |
863 | boolean relocs; | |
864 | boolean reltext; | |
013dec1a ILT |
865 | |
866 | dynobj = elf_hash_table (info)->dynobj; | |
867 | BFD_ASSERT (dynobj != NULL); | |
868 | ||
12662be4 | 869 | if (elf_hash_table (info)->dynamic_sections_created) |
8af74670 | 870 | { |
12662be4 ILT |
871 | /* Set the contents of the .interp section to the interpreter. */ |
872 | if (! info->shared) | |
873 | { | |
874 | s = bfd_get_section_by_name (dynobj, ".interp"); | |
875 | BFD_ASSERT (s != NULL); | |
876 | s->_raw_size = sizeof ELF_DYNAMIC_INTERPRETER; | |
877 | s->contents = (unsigned char *) ELF_DYNAMIC_INTERPRETER; | |
878 | } | |
879 | } | |
880 | else | |
881 | { | |
882 | /* We may have created entries in the .rel.got section. | |
883 | However, if we are not creating the dynamic sections, we will | |
884 | not actually use these entries. Reset the size of .rel.got, | |
885 | which will cause it to get stripped from the output file | |
886 | below. */ | |
887 | s = bfd_get_section_by_name (dynobj, ".rel.got"); | |
888 | if (s != NULL) | |
889 | s->_raw_size = 0; | |
8af74670 | 890 | } |
013dec1a | 891 | |
6e2183b1 ILT |
892 | /* If this is a -Bsymbolic shared link, then we need to discard all |
893 | PC relative relocs against symbols defined in a regular object. | |
894 | We allocated space for them in the check_relocs routine, but we | |
895 | will not fill them in in the relocate_section routine. */ | |
896 | if (info->shared && info->symbolic) | |
897 | elf_i386_link_hash_traverse (elf_i386_hash_table (info), | |
898 | elf_i386_discard_copies, | |
899 | (PTR) NULL); | |
900 | ||
eb4267a3 ILT |
901 | /* The check_relocs and adjust_dynamic_symbol entry points have |
902 | determined the sizes of the various dynamic sections. Allocate | |
903 | memory for them. */ | |
904 | plt = false; | |
905 | relocs = false; | |
906 | reltext = false; | |
907 | for (s = dynobj->sections; s != NULL; s = s->next) | |
908 | { | |
909 | const char *name; | |
910 | boolean strip; | |
911 | ||
ff12f303 | 912 | if ((s->flags & SEC_LINKER_CREATED) == 0) |
eb4267a3 ILT |
913 | continue; |
914 | ||
915 | /* It's OK to base decisions on the section name, because none | |
916 | of the dynobj section names depend upon the input files. */ | |
917 | name = bfd_get_section_name (dynobj, s); | |
918 | ||
919 | strip = false; | |
920 | ||
921 | if (strcmp (name, ".plt") == 0) | |
922 | { | |
923 | if (s->_raw_size == 0) | |
924 | { | |
925 | /* Strip this section if we don't need it; see the | |
926 | comment below. */ | |
927 | strip = true; | |
928 | } | |
929 | else | |
930 | { | |
931 | /* Remember whether there is a PLT. */ | |
932 | plt = true; | |
933 | } | |
934 | } | |
935 | else if (strncmp (name, ".rel", 4) == 0) | |
936 | { | |
937 | if (s->_raw_size == 0) | |
938 | { | |
939 | /* If we don't need this section, strip it from the | |
940 | output file. This is mostly to handle .rel.bss and | |
941 | .rel.plt. We must create both sections in | |
942 | create_dynamic_sections, because they must be created | |
943 | before the linker maps input sections to output | |
944 | sections. The linker does that before | |
945 | adjust_dynamic_symbol is called, and it is that | |
946 | function which decides whether anything needs to go | |
947 | into these sections. */ | |
948 | strip = true; | |
949 | } | |
950 | else | |
951 | { | |
952 | asection *target; | |
953 | ||
954 | /* Remember whether there are any reloc sections other | |
955 | than .rel.plt. */ | |
956 | if (strcmp (name, ".rel.plt") != 0) | |
3c38b3df | 957 | { |
6e2183b1 ILT |
958 | const char *outname; |
959 | ||
3c38b3df ILT |
960 | relocs = true; |
961 | ||
962 | /* If this relocation section applies to a read only | |
963 | section, then we probably need a DT_TEXTREL | |
964 | entry. The entries in the .rel.plt section | |
965 | really apply to the .got section, which we | |
966 | created ourselves and so know is not readonly. */ | |
6e2183b1 ILT |
967 | outname = bfd_get_section_name (output_bfd, |
968 | s->output_section); | |
969 | target = bfd_get_section_by_name (output_bfd, outname + 4); | |
3c38b3df ILT |
970 | if (target != NULL |
971 | && (target->flags & SEC_READONLY) != 0) | |
972 | reltext = true; | |
973 | } | |
eb4267a3 ILT |
974 | |
975 | /* We use the reloc_count field as a counter if we need | |
976 | to copy relocs into the output file. */ | |
977 | s->reloc_count = 0; | |
978 | } | |
979 | } | |
980 | else if (strncmp (name, ".got", 4) != 0) | |
981 | { | |
982 | /* It's not one of our sections, so don't allocate space. */ | |
983 | continue; | |
984 | } | |
985 | ||
986 | if (strip) | |
987 | { | |
988 | asection **spp; | |
989 | ||
990 | for (spp = &s->output_section->owner->sections; | |
991 | *spp != s->output_section; | |
992 | spp = &(*spp)->next) | |
993 | ; | |
994 | *spp = s->output_section->next; | |
995 | --s->output_section->owner->section_count; | |
996 | ||
997 | continue; | |
998 | } | |
013dec1a | 999 | |
eb4267a3 ILT |
1000 | /* Allocate memory for the section contents. */ |
1001 | s->contents = (bfd_byte *) bfd_alloc (dynobj, s->_raw_size); | |
1002 | if (s->contents == NULL && s->_raw_size != 0) | |
3c38b3df | 1003 | return false; |
eb4267a3 | 1004 | } |
ff12f303 | 1005 | |
12662be4 | 1006 | if (elf_hash_table (info)->dynamic_sections_created) |
eb4267a3 | 1007 | { |
12662be4 ILT |
1008 | /* Add some entries to the .dynamic section. We fill in the |
1009 | values later, in elf_i386_finish_dynamic_sections, but we | |
1010 | must add the entries now so that we get the correct size for | |
1011 | the .dynamic section. The DT_DEBUG entry is filled in by the | |
1012 | dynamic linker and used by the debugger. */ | |
1013 | if (! info->shared) | |
1014 | { | |
1015 | if (! bfd_elf32_add_dynamic_entry (info, DT_DEBUG, 0)) | |
1016 | return false; | |
1017 | } | |
013dec1a | 1018 | |
12662be4 ILT |
1019 | if (plt) |
1020 | { | |
1021 | if (! bfd_elf32_add_dynamic_entry (info, DT_PLTGOT, 0) | |
1022 | || ! bfd_elf32_add_dynamic_entry (info, DT_PLTRELSZ, 0) | |
1023 | || ! bfd_elf32_add_dynamic_entry (info, DT_PLTREL, DT_REL) | |
1024 | || ! bfd_elf32_add_dynamic_entry (info, DT_JMPREL, 0)) | |
1025 | return false; | |
1026 | } | |
013dec1a | 1027 | |
12662be4 ILT |
1028 | if (relocs) |
1029 | { | |
1030 | if (! bfd_elf32_add_dynamic_entry (info, DT_REL, 0) | |
1031 | || ! bfd_elf32_add_dynamic_entry (info, DT_RELSZ, 0) | |
1032 | || ! bfd_elf32_add_dynamic_entry (info, DT_RELENT, | |
1033 | sizeof (Elf32_External_Rel))) | |
1034 | return false; | |
1035 | } | |
013dec1a | 1036 | |
12662be4 ILT |
1037 | if (reltext) |
1038 | { | |
1039 | if (! bfd_elf32_add_dynamic_entry (info, DT_TEXTREL, 0)) | |
1040 | return false; | |
1041 | } | |
eb4267a3 ILT |
1042 | } |
1043 | ||
013dec1a ILT |
1044 | return true; |
1045 | } | |
1046 | ||
6e2183b1 ILT |
1047 | /* This function is called via elf_i386_link_hash_traverse if we are |
1048 | creating a shared object with -Bsymbolic. It discards the space | |
1049 | allocated to copy PC relative relocs against symbols which are | |
1050 | defined in regular objects. We allocated space for them in the | |
1051 | check_relocs routine, but we won't fill them in in the | |
1052 | relocate_section routine. */ | |
1053 | ||
1054 | /*ARGSUSED*/ | |
1055 | static boolean | |
1056 | elf_i386_discard_copies (h, ignore) | |
1057 | struct elf_i386_link_hash_entry *h; | |
1058 | PTR ignore; | |
1059 | { | |
1060 | struct elf_i386_pcrel_relocs_copied *s; | |
1061 | ||
1062 | /* We only discard relocs for symbols defined in a regular object. */ | |
1063 | if ((h->root.elf_link_hash_flags & ELF_LINK_HASH_DEF_REGULAR) == 0) | |
1064 | return true; | |
1065 | ||
1066 | for (s = h->pcrel_relocs_copied; s != NULL; s = s->next) | |
1067 | s->section->_raw_size -= s->count * sizeof (Elf32_External_Rel); | |
1068 | ||
1069 | return true; | |
1070 | } | |
1071 | ||
013dec1a ILT |
1072 | /* Relocate an i386 ELF section. */ |
1073 | ||
1074 | static boolean | |
1075 | elf_i386_relocate_section (output_bfd, info, input_bfd, input_section, | |
eb4267a3 | 1076 | contents, relocs, local_syms, local_sections) |
013dec1a ILT |
1077 | bfd *output_bfd; |
1078 | struct bfd_link_info *info; | |
1079 | bfd *input_bfd; | |
1080 | asection *input_section; | |
1081 | bfd_byte *contents; | |
1082 | Elf_Internal_Rela *relocs; | |
1083 | Elf_Internal_Sym *local_syms; | |
1084 | asection **local_sections; | |
1085 | { | |
eb4267a3 | 1086 | bfd *dynobj; |
013dec1a | 1087 | Elf_Internal_Shdr *symtab_hdr; |
eb4267a3 ILT |
1088 | struct elf_link_hash_entry **sym_hashes; |
1089 | bfd_vma *local_got_offsets; | |
1090 | asection *sgot; | |
1091 | asection *splt; | |
1092 | asection *sreloc; | |
013dec1a ILT |
1093 | Elf_Internal_Rela *rel; |
1094 | Elf_Internal_Rela *relend; | |
1095 | ||
eb4267a3 | 1096 | dynobj = elf_hash_table (info)->dynobj; |
013dec1a | 1097 | symtab_hdr = &elf_tdata (input_bfd)->symtab_hdr; |
eb4267a3 ILT |
1098 | sym_hashes = elf_sym_hashes (input_bfd); |
1099 | local_got_offsets = elf_local_got_offsets (input_bfd); | |
1100 | ||
1101 | sgot = NULL; | |
1102 | splt = NULL; | |
1103 | sreloc = NULL; | |
013dec1a ILT |
1104 | |
1105 | rel = relocs; | |
1106 | relend = relocs + input_section->reloc_count; | |
1107 | for (; rel < relend; rel++) | |
1108 | { | |
1109 | int r_type; | |
82b1edf7 | 1110 | reloc_howto_type *howto; |
3b3f7625 | 1111 | unsigned long r_symndx; |
013dec1a ILT |
1112 | struct elf_link_hash_entry *h; |
1113 | Elf_Internal_Sym *sym; | |
1114 | asection *sec; | |
1115 | bfd_vma relocation; | |
1116 | bfd_reloc_status_type r; | |
1117 | ||
1118 | r_type = ELF32_R_TYPE (rel->r_info); | |
ff12f303 ILT |
1119 | if (r_type < 0 |
1120 | || r_type >= (int) R_386_max | |
1121 | || (r_type >= (int) FIRST_INVALID_RELOC | |
1122 | && r_type <= (int) LAST_INVALID_RELOC)) | |
013dec1a ILT |
1123 | { |
1124 | bfd_set_error (bfd_error_bad_value); | |
1125 | return false; | |
1126 | } | |
1127 | howto = elf_howto_table + r_type; | |
1128 | ||
1129 | r_symndx = ELF32_R_SYM (rel->r_info); | |
1130 | ||
1131 | if (info->relocateable) | |
1132 | { | |
1133 | /* This is a relocateable link. We don't have to change | |
1134 | anything, unless the reloc is against a section symbol, | |
1135 | in which case we have to adjust according to where the | |
1136 | section symbol winds up in the output section. */ | |
1137 | if (r_symndx < symtab_hdr->sh_info) | |
1138 | { | |
1139 | sym = local_syms + r_symndx; | |
1140 | if (ELF_ST_TYPE (sym->st_info) == STT_SECTION) | |
1141 | { | |
1142 | bfd_vma val; | |
1143 | ||
1144 | sec = local_sections[r_symndx]; | |
1145 | val = bfd_get_32 (input_bfd, contents + rel->r_offset); | |
1146 | val += sec->output_offset + sym->st_value; | |
1147 | bfd_put_32 (input_bfd, val, contents + rel->r_offset); | |
1148 | } | |
1149 | } | |
1150 | ||
1151 | continue; | |
1152 | } | |
1153 | ||
1154 | /* This is a final link. */ | |
1155 | h = NULL; | |
1156 | sym = NULL; | |
1157 | sec = NULL; | |
1158 | if (r_symndx < symtab_hdr->sh_info) | |
1159 | { | |
1160 | sym = local_syms + r_symndx; | |
1161 | sec = local_sections[r_symndx]; | |
1162 | relocation = (sec->output_section->vma | |
1163 | + sec->output_offset | |
1164 | + sym->st_value); | |
1165 | } | |
1166 | else | |
1167 | { | |
eb4267a3 | 1168 | h = sym_hashes[r_symndx - symtab_hdr->sh_info]; |
cf5138e3 ILT |
1169 | while (h->root.type == bfd_link_hash_indirect |
1170 | || h->root.type == bfd_link_hash_warning) | |
1171 | h = (struct elf_link_hash_entry *) h->root.u.i.link; | |
30dc85f1 ILT |
1172 | if (h->root.type == bfd_link_hash_defined |
1173 | || h->root.type == bfd_link_hash_defweak) | |
013dec1a ILT |
1174 | { |
1175 | sec = h->root.u.def.section; | |
9b09a015 ILT |
1176 | if (r_type == R_386_GOTPC |
1177 | || (r_type == R_386_PLT32 | |
1178 | && h->plt_offset != (bfd_vma) -1) | |
1179 | || (r_type == R_386_GOT32 | |
452a5efb ILT |
1180 | && elf_hash_table (info)->dynamic_sections_created |
1181 | && (! info->shared | |
8519ea21 | 1182 | || (! info->symbolic && h->dynindx != -1) |
452a5efb ILT |
1183 | || (h->elf_link_hash_flags |
1184 | & ELF_LINK_HASH_DEF_REGULAR) == 0)) | |
9b09a015 | 1185 | || (info->shared |
6a1878c9 | 1186 | && ((! info->symbolic && h->dynindx != -1) |
53787b23 ILT |
1187 | || (h->elf_link_hash_flags |
1188 | & ELF_LINK_HASH_DEF_REGULAR) == 0) | |
9b09a015 | 1189 | && (r_type == R_386_32 |
ff12f303 | 1190 | || r_type == R_386_PC32))) |
9b09a015 ILT |
1191 | { |
1192 | /* In these cases, we don't need the relocation | |
1193 | value. We check specially because in some | |
1194 | obscure cases sec->output_section will be NULL. */ | |
1195 | relocation = 0; | |
1196 | } | |
ff12f303 ILT |
1197 | else if (sec->output_section == NULL) |
1198 | { | |
1199 | (*_bfd_error_handler) | |
1200 | ("%s: warning: unresolvable relocation against symbol `%s' from %s section", | |
1201 | bfd_get_filename (input_bfd), h->root.root.string, | |
1202 | bfd_get_section_name (input_bfd, input_section)); | |
1203 | relocation = 0; | |
1204 | } | |
9b09a015 ILT |
1205 | else |
1206 | relocation = (h->root.u.def.value | |
1207 | + sec->output_section->vma | |
1208 | + sec->output_offset); | |
013dec1a | 1209 | } |
30dc85f1 | 1210 | else if (h->root.type == bfd_link_hash_undefweak) |
013dec1a | 1211 | relocation = 0; |
452a5efb | 1212 | else if (info->shared && !info->symbolic) |
eb4267a3 | 1213 | relocation = 0; |
013dec1a ILT |
1214 | else |
1215 | { | |
1216 | if (! ((*info->callbacks->undefined_symbol) | |
1217 | (info, h->root.root.string, input_bfd, | |
1218 | input_section, rel->r_offset))) | |
1219 | return false; | |
1220 | relocation = 0; | |
1221 | } | |
1222 | } | |
1223 | ||
eb4267a3 ILT |
1224 | switch (r_type) |
1225 | { | |
1226 | case R_386_GOT32: | |
1227 | /* Relocation is to the entry for this symbol in the global | |
1228 | offset table. */ | |
1229 | if (sgot == NULL) | |
1230 | { | |
1231 | sgot = bfd_get_section_by_name (dynobj, ".got"); | |
1232 | BFD_ASSERT (sgot != NULL); | |
1233 | } | |
1234 | ||
1235 | if (h != NULL) | |
1236 | { | |
12662be4 ILT |
1237 | bfd_vma off; |
1238 | ||
1239 | off = h->got_offset; | |
1240 | BFD_ASSERT (off != (bfd_vma) -1); | |
1241 | ||
452a5efb ILT |
1242 | if (! elf_hash_table (info)->dynamic_sections_created |
1243 | || (info->shared | |
8519ea21 | 1244 | && (info->symbolic || h->dynindx == -1) |
452a5efb | 1245 | && (h->elf_link_hash_flags & ELF_LINK_HASH_DEF_REGULAR))) |
12662be4 | 1246 | { |
452a5efb ILT |
1247 | /* This is actually a static link, or it is a |
1248 | -Bsymbolic link and the symbol is defined | |
8519ea21 ILT |
1249 | locally, or the symbol was forced to be local |
1250 | because of a version file. We must initialize | |
1251 | this entry in the global offset table. Since the | |
1252 | offset must always be a multiple of 4, we use the | |
1253 | least significant bit to record whether we have | |
452a5efb | 1254 | initialized it already. |
12662be4 ILT |
1255 | |
1256 | When doing a dynamic link, we create a .rel.got | |
1257 | relocation entry to initialize the value. This | |
1258 | is done in the finish_dynamic_symbol routine. */ | |
1259 | if ((off & 1) != 0) | |
1260 | off &= ~1; | |
1261 | else | |
1262 | { | |
1263 | bfd_put_32 (output_bfd, relocation, | |
1264 | sgot->contents + off); | |
1265 | h->got_offset |= 1; | |
1266 | } | |
1267 | } | |
1268 | ||
1269 | relocation = sgot->output_offset + off; | |
eb4267a3 ILT |
1270 | } |
1271 | else | |
1272 | { | |
1273 | bfd_vma off; | |
1274 | ||
1275 | BFD_ASSERT (local_got_offsets != NULL | |
1276 | && local_got_offsets[r_symndx] != (bfd_vma) -1); | |
1277 | ||
1278 | off = local_got_offsets[r_symndx]; | |
1279 | ||
1280 | /* The offset must always be a multiple of 4. We use | |
1281 | the least significant bit to record whether we have | |
1282 | already generated the necessary reloc. */ | |
1283 | if ((off & 1) != 0) | |
1284 | off &= ~1; | |
1285 | else | |
1286 | { | |
eb4267a3 ILT |
1287 | bfd_put_32 (output_bfd, relocation, sgot->contents + off); |
1288 | ||
12662be4 ILT |
1289 | if (info->shared) |
1290 | { | |
1291 | asection *srelgot; | |
1292 | Elf_Internal_Rel outrel; | |
1293 | ||
1294 | srelgot = bfd_get_section_by_name (dynobj, ".rel.got"); | |
1295 | BFD_ASSERT (srelgot != NULL); | |
1296 | ||
1297 | outrel.r_offset = (sgot->output_section->vma | |
1298 | + sgot->output_offset | |
1299 | + off); | |
1300 | outrel.r_info = ELF32_R_INFO (0, R_386_RELATIVE); | |
1301 | bfd_elf32_swap_reloc_out (output_bfd, &outrel, | |
1302 | (((Elf32_External_Rel *) | |
1303 | srelgot->contents) | |
1304 | + srelgot->reloc_count)); | |
1305 | ++srelgot->reloc_count; | |
1306 | } | |
eb4267a3 ILT |
1307 | |
1308 | local_got_offsets[r_symndx] |= 1; | |
1309 | } | |
1310 | ||
1311 | relocation = sgot->output_offset + off; | |
1312 | } | |
1313 | ||
1314 | break; | |
1315 | ||
1316 | case R_386_GOTOFF: | |
1317 | /* Relocation is relative to the start of the global offset | |
1318 | table. */ | |
1319 | ||
1320 | if (sgot == NULL) | |
1321 | { | |
1322 | sgot = bfd_get_section_by_name (dynobj, ".got"); | |
1323 | BFD_ASSERT (sgot != NULL); | |
1324 | } | |
1325 | ||
1326 | /* Note that sgot->output_offset is not involved in this | |
1327 | calculation. We always want the start of .got. If we | |
1328 | defined _GLOBAL_OFFSET_TABLE in a different way, as is | |
1329 | permitted by the ABI, we might have to change this | |
1330 | calculation. */ | |
1331 | relocation -= sgot->output_section->vma; | |
1332 | ||
1333 | break; | |
1334 | ||
1335 | case R_386_GOTPC: | |
1336 | /* Use global offset table as symbol value. */ | |
1337 | ||
1338 | if (sgot == NULL) | |
1339 | { | |
1340 | sgot = bfd_get_section_by_name (dynobj, ".got"); | |
1341 | BFD_ASSERT (sgot != NULL); | |
1342 | } | |
1343 | ||
1344 | relocation = sgot->output_section->vma; | |
1345 | ||
1346 | break; | |
1347 | ||
1348 | case R_386_PLT32: | |
1349 | /* Relocation is to the entry for this symbol in the | |
1350 | procedure linkage table. */ | |
1351 | ||
1352 | /* Resolve a PLT32 reloc again a local symbol directly, | |
1353 | without using the procedure linkage table. */ | |
1354 | if (h == NULL) | |
1355 | break; | |
1356 | ||
12662be4 ILT |
1357 | if (h->plt_offset == (bfd_vma) -1) |
1358 | { | |
1359 | /* We didn't make a PLT entry for this symbol. This | |
452a5efb ILT |
1360 | happens when statically linking PIC code, or when |
1361 | using -Bsymbolic. */ | |
12662be4 ILT |
1362 | break; |
1363 | } | |
1364 | ||
eb4267a3 ILT |
1365 | if (splt == NULL) |
1366 | { | |
1367 | splt = bfd_get_section_by_name (dynobj, ".plt"); | |
1368 | BFD_ASSERT (splt != NULL); | |
1369 | } | |
1370 | ||
eb4267a3 ILT |
1371 | relocation = (splt->output_section->vma |
1372 | + splt->output_offset | |
1373 | + h->plt_offset); | |
1374 | ||
1375 | break; | |
1376 | ||
1377 | case R_386_32: | |
1378 | case R_386_PC32: | |
1379 | if (info->shared | |
53787b23 ILT |
1380 | && (r_type != R_386_PC32 |
1381 | || (h != NULL | |
1382 | && (! info->symbolic | |
1383 | || (h->elf_link_hash_flags | |
1384 | & ELF_LINK_HASH_DEF_REGULAR) == 0)))) | |
eb4267a3 ILT |
1385 | { |
1386 | Elf_Internal_Rel outrel; | |
6e2183b1 | 1387 | boolean skip, relocate; |
eb4267a3 ILT |
1388 | |
1389 | /* When generating a shared object, these relocations | |
1390 | are copied into the output file to be resolved at run | |
1391 | time. */ | |
1392 | ||
1393 | if (sreloc == NULL) | |
1394 | { | |
1d5d75e9 ILT |
1395 | const char *name; |
1396 | ||
1397 | name = (bfd_elf_string_from_elf_section | |
eb4267a3 ILT |
1398 | (input_bfd, |
1399 | elf_elfheader (input_bfd)->e_shstrndx, | |
1400 | elf_section_data (input_section)->rel_hdr.sh_name)); | |
1d5d75e9 | 1401 | if (name == NULL) |
eb4267a3 ILT |
1402 | return false; |
1403 | ||
1d5d75e9 | 1404 | BFD_ASSERT (strncmp (name, ".rel", 4) == 0 |
eb4267a3 ILT |
1405 | && strcmp (bfd_get_section_name (input_bfd, |
1406 | input_section), | |
1d5d75e9 | 1407 | name + 4) == 0); |
eb4267a3 | 1408 | |
1d5d75e9 | 1409 | sreloc = bfd_get_section_by_name (dynobj, name); |
eb4267a3 ILT |
1410 | BFD_ASSERT (sreloc != NULL); |
1411 | } | |
1412 | ||
6e2183b1 ILT |
1413 | skip = false; |
1414 | ||
1415 | if (elf_section_data (input_section)->stab_info == NULL) | |
1416 | outrel.r_offset = rel->r_offset; | |
1417 | else | |
1418 | { | |
1419 | bfd_vma off; | |
1420 | ||
1421 | off = (_bfd_stab_section_offset | |
1422 | (output_bfd, &elf_hash_table (info)->stab_info, | |
1423 | input_section, | |
1424 | &elf_section_data (input_section)->stab_info, | |
1425 | rel->r_offset)); | |
1426 | if (off == (bfd_vma) -1) | |
1427 | skip = true; | |
1428 | outrel.r_offset = off; | |
1429 | } | |
1430 | ||
1431 | outrel.r_offset += (input_section->output_section->vma | |
1432 | + input_section->output_offset); | |
1433 | ||
1434 | if (skip) | |
1435 | { | |
1436 | memset (&outrel, 0, sizeof outrel); | |
1437 | relocate = false; | |
1438 | } | |
1439 | else if (r_type == R_386_PC32) | |
eb4267a3 | 1440 | { |
1d5d75e9 | 1441 | BFD_ASSERT (h != NULL && h->dynindx != -1); |
53787b23 | 1442 | relocate = false; |
1d5d75e9 | 1443 | outrel.r_info = ELF32_R_INFO (h->dynindx, R_386_PC32); |
eb4267a3 ILT |
1444 | } |
1445 | else | |
1446 | { | |
6e2183b1 ILT |
1447 | /* h->dynindx may be -1 if this symbol was marked to |
1448 | become local. */ | |
53787b23 | 1449 | if (h == NULL |
6e2183b1 | 1450 | || ((info->symbolic || h->dynindx == -1) |
53787b23 ILT |
1451 | && (h->elf_link_hash_flags |
1452 | & ELF_LINK_HASH_DEF_REGULAR) != 0)) | |
1453 | { | |
1454 | relocate = true; | |
1455 | outrel.r_info = ELF32_R_INFO (0, R_386_RELATIVE); | |
1456 | } | |
eb4267a3 ILT |
1457 | else |
1458 | { | |
3b3f7625 | 1459 | BFD_ASSERT (h->dynindx != -1); |
53787b23 | 1460 | relocate = false; |
eb4267a3 ILT |
1461 | outrel.r_info = ELF32_R_INFO (h->dynindx, R_386_32); |
1462 | } | |
1463 | } | |
1464 | ||
1465 | bfd_elf32_swap_reloc_out (output_bfd, &outrel, | |
1466 | (((Elf32_External_Rel *) | |
1467 | sreloc->contents) | |
1468 | + sreloc->reloc_count)); | |
1469 | ++sreloc->reloc_count; | |
1470 | ||
1471 | /* If this reloc is against an external symbol, we do | |
1472 | not want to fiddle with the addend. Otherwise, we | |
1473 | need to include the symbol value so that it becomes | |
1474 | an addend for the dynamic reloc. */ | |
53787b23 | 1475 | if (! relocate) |
eb4267a3 ILT |
1476 | continue; |
1477 | } | |
1478 | ||
1479 | break; | |
1480 | ||
1481 | default: | |
1482 | break; | |
1483 | } | |
1484 | ||
013dec1a ILT |
1485 | r = _bfd_final_link_relocate (howto, input_bfd, input_section, |
1486 | contents, rel->r_offset, | |
1487 | relocation, (bfd_vma) 0); | |
1488 | ||
1489 | if (r != bfd_reloc_ok) | |
1490 | { | |
1491 | switch (r) | |
1492 | { | |
1493 | default: | |
1494 | case bfd_reloc_outofrange: | |
1495 | abort (); | |
1496 | case bfd_reloc_overflow: | |
1497 | { | |
1498 | const char *name; | |
1499 | ||
1500 | if (h != NULL) | |
1501 | name = h->root.root.string; | |
1502 | else | |
1503 | { | |
ede4eed4 KR |
1504 | name = bfd_elf_string_from_elf_section (input_bfd, |
1505 | symtab_hdr->sh_link, | |
1506 | sym->st_name); | |
013dec1a ILT |
1507 | if (name == NULL) |
1508 | return false; | |
1509 | if (*name == '\0') | |
1510 | name = bfd_section_name (input_bfd, sec); | |
1511 | } | |
1512 | if (! ((*info->callbacks->reloc_overflow) | |
1513 | (info, name, howto->name, (bfd_vma) 0, | |
1514 | input_bfd, input_section, rel->r_offset))) | |
1515 | return false; | |
1516 | } | |
1517 | break; | |
1518 | } | |
1519 | } | |
1520 | } | |
1521 | ||
1522 | return true; | |
1523 | } | |
1524 | ||
1525 | /* Finish up dynamic symbol handling. We set the contents of various | |
1526 | dynamic sections here. */ | |
1527 | ||
1528 | static boolean | |
1529 | elf_i386_finish_dynamic_symbol (output_bfd, info, h, sym) | |
1530 | bfd *output_bfd; | |
1531 | struct bfd_link_info *info; | |
1532 | struct elf_link_hash_entry *h; | |
1533 | Elf_Internal_Sym *sym; | |
1534 | { | |
eb4267a3 | 1535 | bfd *dynobj; |
013dec1a | 1536 | |
eb4267a3 | 1537 | dynobj = elf_hash_table (info)->dynobj; |
013dec1a | 1538 | |
eb4267a3 | 1539 | if (h->plt_offset != (bfd_vma) -1) |
013dec1a ILT |
1540 | { |
1541 | asection *splt; | |
1542 | asection *sgot; | |
1543 | asection *srel; | |
1544 | bfd_vma plt_index; | |
1545 | bfd_vma got_offset; | |
1546 | Elf_Internal_Rel rel; | |
1547 | ||
eb4267a3 ILT |
1548 | /* This symbol has an entry in the procedure linkage table. Set |
1549 | it up. */ | |
013dec1a | 1550 | |
eb4267a3 ILT |
1551 | BFD_ASSERT (h->dynindx != -1); |
1552 | ||
1553 | splt = bfd_get_section_by_name (dynobj, ".plt"); | |
1554 | sgot = bfd_get_section_by_name (dynobj, ".got.plt"); | |
1555 | srel = bfd_get_section_by_name (dynobj, ".rel.plt"); | |
1556 | BFD_ASSERT (splt != NULL && sgot != NULL && srel != NULL); | |
013dec1a ILT |
1557 | |
1558 | /* Get the index in the procedure linkage table which | |
1559 | corresponds to this symbol. This is the index of this symbol | |
1560 | in all the symbols for which we are making plt entries. The | |
1561 | first entry in the procedure linkage table is reserved. */ | |
eb4267a3 | 1562 | plt_index = h->plt_offset / PLT_ENTRY_SIZE - 1; |
013dec1a ILT |
1563 | |
1564 | /* Get the offset into the .got table of the entry that | |
1565 | corresponds to this function. Each .got entry is 4 bytes. | |
1566 | The first three are reserved. */ | |
1567 | got_offset = (plt_index + 3) * 4; | |
1568 | ||
1569 | /* Fill in the entry in the procedure linkage table. */ | |
eb4267a3 ILT |
1570 | if (! info->shared) |
1571 | { | |
1572 | memcpy (splt->contents + h->plt_offset, elf_i386_plt_entry, | |
1573 | PLT_ENTRY_SIZE); | |
1574 | bfd_put_32 (output_bfd, | |
1575 | (sgot->output_section->vma | |
1576 | + sgot->output_offset | |
1577 | + got_offset), | |
1578 | splt->contents + h->plt_offset + 2); | |
1579 | } | |
1580 | else | |
1581 | { | |
1582 | memcpy (splt->contents + h->plt_offset, elf_i386_pic_plt_entry, | |
1583 | PLT_ENTRY_SIZE); | |
1584 | bfd_put_32 (output_bfd, got_offset, | |
1585 | splt->contents + h->plt_offset + 2); | |
1586 | } | |
1587 | ||
013dec1a | 1588 | bfd_put_32 (output_bfd, plt_index * sizeof (Elf32_External_Rel), |
eb4267a3 ILT |
1589 | splt->contents + h->plt_offset + 7); |
1590 | bfd_put_32 (output_bfd, - (h->plt_offset + PLT_ENTRY_SIZE), | |
1591 | splt->contents + h->plt_offset + 12); | |
013dec1a ILT |
1592 | |
1593 | /* Fill in the entry in the global offset table. */ | |
1594 | bfd_put_32 (output_bfd, | |
1595 | (splt->output_section->vma | |
1596 | + splt->output_offset | |
eb4267a3 | 1597 | + h->plt_offset |
013dec1a ILT |
1598 | + 6), |
1599 | sgot->contents + got_offset); | |
1600 | ||
1601 | /* Fill in the entry in the .rel.plt section. */ | |
1602 | rel.r_offset = (sgot->output_section->vma | |
1603 | + sgot->output_offset | |
1604 | + got_offset); | |
1605 | rel.r_info = ELF32_R_INFO (h->dynindx, R_386_JUMP_SLOT); | |
1606 | bfd_elf32_swap_reloc_out (output_bfd, &rel, | |
1607 | ((Elf32_External_Rel *) srel->contents | |
1608 | + plt_index)); | |
1609 | ||
eb4267a3 ILT |
1610 | if ((h->elf_link_hash_flags & ELF_LINK_HASH_DEF_REGULAR) == 0) |
1611 | { | |
1612 | /* Mark the symbol as undefined, rather than as defined in | |
1613 | the .plt section. Leave the value alone. */ | |
1614 | sym->st_shndx = SHN_UNDEF; | |
1615 | } | |
013dec1a | 1616 | } |
eb4267a3 ILT |
1617 | |
1618 | if (h->got_offset != (bfd_vma) -1) | |
013dec1a | 1619 | { |
eb4267a3 ILT |
1620 | asection *sgot; |
1621 | asection *srel; | |
1622 | Elf_Internal_Rel rel; | |
013dec1a | 1623 | |
eb4267a3 ILT |
1624 | /* This symbol has an entry in the global offset table. Set it |
1625 | up. */ | |
ff12f303 | 1626 | |
eb4267a3 ILT |
1627 | sgot = bfd_get_section_by_name (dynobj, ".got"); |
1628 | srel = bfd_get_section_by_name (dynobj, ".rel.got"); | |
1629 | BFD_ASSERT (sgot != NULL && srel != NULL); | |
1630 | ||
eb4267a3 ILT |
1631 | rel.r_offset = (sgot->output_section->vma |
1632 | + sgot->output_offset | |
452a5efb ILT |
1633 | + (h->got_offset &~ 1)); |
1634 | ||
1635 | /* If this is a -Bsymbolic link, and the symbol is defined | |
8519ea21 ILT |
1636 | locally, we just want to emit a RELATIVE reloc. Likewise if |
1637 | the symbol was forced to be local because of a version file. | |
1638 | The entry in the global offset table will already have been | |
1639 | initialized in the relocate_section function. */ | |
452a5efb | 1640 | if (info->shared |
8519ea21 | 1641 | && (info->symbolic || h->dynindx == -1) |
452a5efb ILT |
1642 | && (h->elf_link_hash_flags & ELF_LINK_HASH_DEF_REGULAR)) |
1643 | rel.r_info = ELF32_R_INFO (0, R_386_RELATIVE); | |
1644 | else | |
1645 | { | |
1646 | bfd_put_32 (output_bfd, (bfd_vma) 0, sgot->contents + h->got_offset); | |
1647 | rel.r_info = ELF32_R_INFO (h->dynindx, R_386_GLOB_DAT); | |
1648 | } | |
1649 | ||
eb4267a3 ILT |
1650 | bfd_elf32_swap_reloc_out (output_bfd, &rel, |
1651 | ((Elf32_External_Rel *) srel->contents | |
1652 | + srel->reloc_count)); | |
1653 | ++srel->reloc_count; | |
1654 | } | |
1655 | ||
1656 | if ((h->elf_link_hash_flags & ELF_LINK_HASH_NEEDS_COPY) != 0) | |
1657 | { | |
1658 | asection *s; | |
1659 | Elf_Internal_Rel rel; | |
1660 | ||
1661 | /* This symbol needs a copy reloc. Set it up. */ | |
1662 | ||
1663 | BFD_ASSERT (h->dynindx != -1 | |
30dc85f1 ILT |
1664 | && (h->root.type == bfd_link_hash_defined |
1665 | || h->root.type == bfd_link_hash_defweak)); | |
eb4267a3 ILT |
1666 | |
1667 | s = bfd_get_section_by_name (h->root.u.def.section->owner, | |
1668 | ".rel.bss"); | |
1669 | BFD_ASSERT (s != NULL); | |
1670 | ||
1671 | rel.r_offset = (h->root.u.def.value | |
1672 | + h->root.u.def.section->output_section->vma | |
1673 | + h->root.u.def.section->output_offset); | |
1674 | rel.r_info = ELF32_R_INFO (h->dynindx, R_386_COPY); | |
1675 | bfd_elf32_swap_reloc_out (output_bfd, &rel, | |
1676 | ((Elf32_External_Rel *) s->contents | |
1677 | + s->reloc_count)); | |
1678 | ++s->reloc_count; | |
013dec1a ILT |
1679 | } |
1680 | ||
eb4267a3 ILT |
1681 | /* Mark _DYNAMIC and _GLOBAL_OFFSET_TABLE_ as absolute. */ |
1682 | if (strcmp (h->root.root.string, "_DYNAMIC") == 0 | |
1683 | || strcmp (h->root.root.string, "_GLOBAL_OFFSET_TABLE_") == 0) | |
1684 | sym->st_shndx = SHN_ABS; | |
1685 | ||
013dec1a ILT |
1686 | return true; |
1687 | } | |
1688 | ||
1689 | /* Finish up the dynamic sections. */ | |
1690 | ||
1691 | static boolean | |
1692 | elf_i386_finish_dynamic_sections (output_bfd, info) | |
1693 | bfd *output_bfd; | |
1694 | struct bfd_link_info *info; | |
1695 | { | |
eb4267a3 | 1696 | bfd *dynobj; |
013dec1a ILT |
1697 | asection *sgot; |
1698 | asection *sdyn; | |
013dec1a | 1699 | |
eb4267a3 ILT |
1700 | dynobj = elf_hash_table (info)->dynobj; |
1701 | ||
eb4267a3 | 1702 | sgot = bfd_get_section_by_name (dynobj, ".got.plt"); |
12662be4 | 1703 | BFD_ASSERT (sgot != NULL); |
eb4267a3 | 1704 | sdyn = bfd_get_section_by_name (dynobj, ".dynamic"); |
013dec1a | 1705 | |
12662be4 | 1706 | if (elf_hash_table (info)->dynamic_sections_created) |
013dec1a | 1707 | { |
12662be4 ILT |
1708 | asection *splt; |
1709 | Elf32_External_Dyn *dyncon, *dynconend; | |
013dec1a | 1710 | |
12662be4 ILT |
1711 | splt = bfd_get_section_by_name (dynobj, ".plt"); |
1712 | BFD_ASSERT (splt != NULL && sdyn != NULL); | |
013dec1a | 1713 | |
12662be4 ILT |
1714 | dyncon = (Elf32_External_Dyn *) sdyn->contents; |
1715 | dynconend = (Elf32_External_Dyn *) (sdyn->contents + sdyn->_raw_size); | |
1716 | for (; dyncon < dynconend; dyncon++) | |
013dec1a | 1717 | { |
12662be4 ILT |
1718 | Elf_Internal_Dyn dyn; |
1719 | const char *name; | |
1720 | asection *s; | |
eb4267a3 | 1721 | |
12662be4 | 1722 | bfd_elf32_swap_dyn_in (dynobj, dyncon, &dyn); |
eb4267a3 | 1723 | |
12662be4 | 1724 | switch (dyn.d_tag) |
013dec1a | 1725 | { |
12662be4 ILT |
1726 | default: |
1727 | break; | |
1728 | ||
1729 | case DT_PLTGOT: | |
1730 | name = ".got"; | |
1731 | goto get_vma; | |
1732 | case DT_JMPREL: | |
1733 | name = ".rel.plt"; | |
1734 | get_vma: | |
1735 | s = bfd_get_section_by_name (output_bfd, name); | |
1736 | BFD_ASSERT (s != NULL); | |
1737 | dyn.d_un.d_ptr = s->vma; | |
1738 | bfd_elf32_swap_dyn_out (output_bfd, &dyn, dyncon); | |
1739 | break; | |
1740 | ||
1741 | case DT_PLTRELSZ: | |
1742 | s = bfd_get_section_by_name (output_bfd, ".rel.plt"); | |
1743 | BFD_ASSERT (s != NULL); | |
013dec1a | 1744 | if (s->_cooked_size != 0) |
12662be4 | 1745 | dyn.d_un.d_val = s->_cooked_size; |
013dec1a | 1746 | else |
12662be4 ILT |
1747 | dyn.d_un.d_val = s->_raw_size; |
1748 | bfd_elf32_swap_dyn_out (output_bfd, &dyn, dyncon); | |
1749 | break; | |
1750 | ||
1751 | case DT_RELSZ: | |
1752 | /* My reading of the SVR4 ABI indicates that the | |
1753 | procedure linkage table relocs (DT_JMPREL) should be | |
1754 | included in the overall relocs (DT_REL). This is | |
1755 | what Solaris does. However, UnixWare can not handle | |
1756 | that case. Therefore, we override the DT_RELSZ entry | |
1757 | here to make it not include the JMPREL relocs. Since | |
1758 | the linker script arranges for .rel.plt to follow all | |
1759 | other relocation sections, we don't have to worry | |
1760 | about changing the DT_REL entry. */ | |
1761 | s = bfd_get_section_by_name (output_bfd, ".rel.plt"); | |
1762 | if (s != NULL) | |
1763 | { | |
1764 | if (s->_cooked_size != 0) | |
1765 | dyn.d_un.d_val -= s->_cooked_size; | |
1766 | else | |
1767 | dyn.d_un.d_val -= s->_raw_size; | |
1768 | } | |
1769 | bfd_elf32_swap_dyn_out (output_bfd, &dyn, dyncon); | |
1770 | break; | |
013dec1a | 1771 | } |
013dec1a | 1772 | } |
013dec1a | 1773 | |
12662be4 ILT |
1774 | /* Fill in the first entry in the procedure linkage table. */ |
1775 | if (splt->_raw_size > 0) | |
eb4267a3 | 1776 | { |
12662be4 ILT |
1777 | if (info->shared) |
1778 | memcpy (splt->contents, elf_i386_pic_plt0_entry, PLT_ENTRY_SIZE); | |
1779 | else | |
1780 | { | |
1781 | memcpy (splt->contents, elf_i386_plt0_entry, PLT_ENTRY_SIZE); | |
1782 | bfd_put_32 (output_bfd, | |
1783 | sgot->output_section->vma + sgot->output_offset + 4, | |
1784 | splt->contents + 2); | |
1785 | bfd_put_32 (output_bfd, | |
1786 | sgot->output_section->vma + sgot->output_offset + 8, | |
1787 | splt->contents + 8); | |
1788 | } | |
eb4267a3 | 1789 | } |
12662be4 ILT |
1790 | |
1791 | /* UnixWare sets the entsize of .plt to 4, although that doesn't | |
1792 | really seem like the right value. */ | |
1793 | elf_section_data (splt->output_section)->this_hdr.sh_entsize = 4; | |
013dec1a ILT |
1794 | } |
1795 | ||
1796 | /* Fill in the first three entries in the global offset table. */ | |
1797 | if (sgot->_raw_size > 0) | |
1798 | { | |
12662be4 ILT |
1799 | if (sdyn == NULL) |
1800 | bfd_put_32 (output_bfd, (bfd_vma) 0, sgot->contents); | |
1801 | else | |
1802 | bfd_put_32 (output_bfd, | |
1803 | sdyn->output_section->vma + sdyn->output_offset, | |
1804 | sgot->contents); | |
013dec1a ILT |
1805 | bfd_put_32 (output_bfd, (bfd_vma) 0, sgot->contents + 4); |
1806 | bfd_put_32 (output_bfd, (bfd_vma) 0, sgot->contents + 8); | |
1807 | } | |
1808 | ||
1809 | elf_section_data (sgot->output_section)->this_hdr.sh_entsize = 4; | |
1810 | ||
013dec1a ILT |
1811 | return true; |
1812 | } | |
e4b6b3e7 ILT |
1813 | |
1814 | #define TARGET_LITTLE_SYM bfd_elf32_i386_vec | |
1815 | #define TARGET_LITTLE_NAME "elf32-i386" | |
1816 | #define ELF_ARCH bfd_arch_i386 | |
68241b2b | 1817 | #define ELF_MACHINE_CODE EM_386 |
6e2183b1 | 1818 | #define ELF_MAXPAGESIZE 0x1000 |
e4b6b3e7 ILT |
1819 | #define elf_info_to_howto elf_i386_info_to_howto |
1820 | #define elf_info_to_howto_rel elf_i386_info_to_howto_rel | |
1821 | #define bfd_elf32_bfd_reloc_type_lookup elf_i386_reloc_type_lookup | |
6e2183b1 ILT |
1822 | #define bfd_elf32_bfd_is_local_label_name \ |
1823 | elf_i386_is_local_label_name | |
013dec1a | 1824 | #define elf_backend_create_dynamic_sections \ |
ede4eed4 | 1825 | _bfd_elf_create_dynamic_sections |
6e2183b1 ILT |
1826 | #define bfd_elf32_bfd_link_hash_table_create \ |
1827 | elf_i386_link_hash_table_create | |
eb4267a3 | 1828 | #define elf_backend_check_relocs elf_i386_check_relocs |
013dec1a ILT |
1829 | #define elf_backend_adjust_dynamic_symbol \ |
1830 | elf_i386_adjust_dynamic_symbol | |
1831 | #define elf_backend_size_dynamic_sections \ | |
1832 | elf_i386_size_dynamic_sections | |
1833 | #define elf_backend_relocate_section elf_i386_relocate_section | |
1834 | #define elf_backend_finish_dynamic_symbol \ | |
1835 | elf_i386_finish_dynamic_symbol | |
1836 | #define elf_backend_finish_dynamic_sections \ | |
1837 | elf_i386_finish_dynamic_sections | |
ede4eed4 | 1838 | #define elf_backend_want_got_plt 1 |
3b3f7625 | 1839 | #define elf_backend_plt_readonly 1 |
ede4eed4 | 1840 | #define elf_backend_want_plt_sym 0 |
e4b6b3e7 ILT |
1841 | |
1842 | #include "elf32-target.h" |