Commit | Line | Data |
---|---|---|
252b5132 | 1 | /* Intel 80386/80486-specific support for 32-bit ELF |
5f771d47 | 2 | Copyright 1993, 94-98, 1999 Free Software Foundation, Inc. |
252b5132 RH |
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 | |
18 | Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA. */ | |
19 | ||
20 | #include "bfd.h" | |
21 | #include "sysdep.h" | |
22 | #include "bfdlink.h" | |
23 | #include "libbfd.h" | |
24 | #include "elf-bfd.h" | |
25 | ||
26 | static reloc_howto_type *elf_i386_reloc_type_lookup | |
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 *)); | |
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 *)); | |
37 | static boolean elf_i386_check_relocs | |
38 | PARAMS ((bfd *, struct bfd_link_info *, asection *, | |
39 | const Elf_Internal_Rela *)); | |
40 | static boolean elf_i386_adjust_dynamic_symbol | |
41 | PARAMS ((struct bfd_link_info *, struct elf_link_hash_entry *)); | |
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 *, | |
46 | Elf_Internal_Rela *, Elf_Internal_Sym *, asection **)); | |
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 | ||
53 | #define USE_REL 1 /* 386 uses REL relocations instead of RELA */ | |
54 | ||
55 | #include "elf/i386.h" | |
56 | ||
57 | static reloc_howto_type elf_howto_table[]= | |
58 | { | |
59 | HOWTO(R_386_NONE, 0,0, 0,false,0,complain_overflow_bitfield, bfd_elf_generic_reloc,"R_386_NONE", true,0x00000000,0x00000000,false), | |
60 | HOWTO(R_386_32, 0,2,32,false,0,complain_overflow_bitfield, bfd_elf_generic_reloc,"R_386_32", true,0xffffffff,0xffffffff,false), | |
61 | HOWTO(R_386_PC32, 0,2,32,true, 0,complain_overflow_bitfield, bfd_elf_generic_reloc,"R_386_PC32", true,0xffffffff,0xffffffff,true), | |
62 | HOWTO(R_386_GOT32, 0,2,32,false,0,complain_overflow_bitfield, bfd_elf_generic_reloc,"R_386_GOT32", true,0xffffffff,0xffffffff,false), | |
63 | HOWTO(R_386_PLT32, 0,2,32,true,0,complain_overflow_bitfield, bfd_elf_generic_reloc,"R_386_PLT32", true,0xffffffff,0xffffffff,true), | |
64 | HOWTO(R_386_COPY, 0,2,32,false,0,complain_overflow_bitfield, bfd_elf_generic_reloc,"R_386_COPY", true,0xffffffff,0xffffffff,false), | |
65 | 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), | |
66 | 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), | |
67 | HOWTO(R_386_RELATIVE, 0,2,32,false,0,complain_overflow_bitfield, bfd_elf_generic_reloc,"R_386_RELATIVE", true,0xffffffff,0xffffffff,false), | |
68 | HOWTO(R_386_GOTOFF, 0,2,32,false,0,complain_overflow_bitfield, bfd_elf_generic_reloc,"R_386_GOTOFF", true,0xffffffff,0xffffffff,false), | |
69 | HOWTO(R_386_GOTPC, 0,2,32,true,0,complain_overflow_bitfield, bfd_elf_generic_reloc,"R_386_GOTPC", true,0xffffffff,0xffffffff,true), | |
5f771d47 ILT |
70 | EMPTY_HOWTO (11), |
71 | EMPTY_HOWTO (12), | |
72 | EMPTY_HOWTO (13), | |
73 | EMPTY_HOWTO (14), | |
74 | EMPTY_HOWTO (15), | |
75 | EMPTY_HOWTO (16), | |
76 | EMPTY_HOWTO (17), | |
77 | EMPTY_HOWTO (18), | |
78 | EMPTY_HOWTO (19), | |
252b5132 RH |
79 | /* The remaining relocs are a GNU extension. */ |
80 | HOWTO(R_386_16, 0,1,16,false,0,complain_overflow_bitfield, bfd_elf_generic_reloc,"R_386_16", true,0xffff,0xffff,false), | |
81 | HOWTO(R_386_PC16, 0,1,16,true, 0,complain_overflow_bitfield, bfd_elf_generic_reloc,"R_386_PC16", true,0xffff,0xffff,true), | |
82 | HOWTO(R_386_8, 0,0,8,false,0,complain_overflow_bitfield, bfd_elf_generic_reloc,"R_386_8", true,0xff,0xff,false), | |
3e269912 | 83 | HOWTO(R_386_PC8, 0,0,8,true, 0,complain_overflow_signed, bfd_elf_generic_reloc,"R_386_PC8", true,0xff,0xff,true), |
252b5132 RH |
84 | }; |
85 | ||
86 | /* GNU extension to record C++ vtable hierarchy. */ | |
87 | static reloc_howto_type elf32_i386_vtinherit_howto = | |
88 | HOWTO (R_386_GNU_VTINHERIT, /* type */ | |
89 | 0, /* rightshift */ | |
90 | 2, /* size (0 = byte, 1 = short, 2 = long) */ | |
91 | 0, /* bitsize */ | |
92 | false, /* pc_relative */ | |
93 | 0, /* bitpos */ | |
94 | complain_overflow_dont, /* complain_on_overflow */ | |
95 | NULL, /* special_function */ | |
96 | "R_386_GNU_VTINHERIT", /* name */ | |
97 | false, /* partial_inplace */ | |
98 | 0, /* src_mask */ | |
99 | 0, /* dst_mask */ | |
100 | false); | |
101 | ||
102 | /* GNU extension to record C++ vtable member usage. */ | |
103 | static reloc_howto_type elf32_i386_vtentry_howto = | |
104 | HOWTO (R_386_GNU_VTENTRY, /* type */ | |
105 | 0, /* rightshift */ | |
106 | 2, /* size (0 = byte, 1 = short, 2 = long) */ | |
107 | 0, /* bitsize */ | |
108 | false, /* pc_relative */ | |
109 | 0, /* bitpos */ | |
110 | complain_overflow_dont, /* complain_on_overflow */ | |
111 | _bfd_elf_rel_vtable_reloc_fn, /* special_function */ | |
112 | "R_386_GNU_VTENTRY", /* name */ | |
113 | false, /* partial_inplace */ | |
114 | 0, /* src_mask */ | |
115 | 0, /* dst_mask */ | |
116 | false); | |
117 | ||
118 | #ifdef DEBUG_GEN_RELOC | |
119 | #define TRACE(str) fprintf (stderr, "i386 bfd reloc lookup %d (%s)\n", code, str) | |
120 | #else | |
121 | #define TRACE(str) | |
122 | #endif | |
123 | ||
124 | static reloc_howto_type * | |
125 | elf_i386_reloc_type_lookup (abfd, code) | |
7442e600 | 126 | bfd *abfd ATTRIBUTE_UNUSED; |
252b5132 RH |
127 | bfd_reloc_code_real_type code; |
128 | { | |
129 | switch (code) | |
130 | { | |
131 | case BFD_RELOC_NONE: | |
132 | TRACE ("BFD_RELOC_NONE"); | |
133 | return &elf_howto_table[ (int)R_386_NONE ]; | |
134 | ||
135 | case BFD_RELOC_32: | |
136 | TRACE ("BFD_RELOC_32"); | |
137 | return &elf_howto_table[ (int)R_386_32 ]; | |
138 | ||
139 | case BFD_RELOC_CTOR: | |
140 | TRACE ("BFD_RELOC_CTOR"); | |
141 | return &elf_howto_table[ (int)R_386_32 ]; | |
142 | ||
143 | case BFD_RELOC_32_PCREL: | |
144 | TRACE ("BFD_RELOC_PC32"); | |
145 | return &elf_howto_table[ (int)R_386_PC32 ]; | |
146 | ||
147 | case BFD_RELOC_386_GOT32: | |
148 | TRACE ("BFD_RELOC_386_GOT32"); | |
149 | return &elf_howto_table[ (int)R_386_GOT32 ]; | |
150 | ||
151 | case BFD_RELOC_386_PLT32: | |
152 | TRACE ("BFD_RELOC_386_PLT32"); | |
153 | return &elf_howto_table[ (int)R_386_PLT32 ]; | |
154 | ||
155 | case BFD_RELOC_386_COPY: | |
156 | TRACE ("BFD_RELOC_386_COPY"); | |
157 | return &elf_howto_table[ (int)R_386_COPY ]; | |
158 | ||
159 | case BFD_RELOC_386_GLOB_DAT: | |
160 | TRACE ("BFD_RELOC_386_GLOB_DAT"); | |
161 | return &elf_howto_table[ (int)R_386_GLOB_DAT ]; | |
162 | ||
163 | case BFD_RELOC_386_JUMP_SLOT: | |
164 | TRACE ("BFD_RELOC_386_JUMP_SLOT"); | |
165 | return &elf_howto_table[ (int)R_386_JUMP_SLOT ]; | |
166 | ||
167 | case BFD_RELOC_386_RELATIVE: | |
168 | TRACE ("BFD_RELOC_386_RELATIVE"); | |
169 | return &elf_howto_table[ (int)R_386_RELATIVE ]; | |
170 | ||
171 | case BFD_RELOC_386_GOTOFF: | |
172 | TRACE ("BFD_RELOC_386_GOTOFF"); | |
173 | return &elf_howto_table[ (int)R_386_GOTOFF ]; | |
174 | ||
175 | case BFD_RELOC_386_GOTPC: | |
176 | TRACE ("BFD_RELOC_386_GOTPC"); | |
177 | return &elf_howto_table[ (int)R_386_GOTPC ]; | |
178 | ||
179 | /* The remaining relocs are a GNU extension. */ | |
180 | case BFD_RELOC_16: | |
181 | TRACE ("BFD_RELOC_16"); | |
182 | return &elf_howto_table[(int) R_386_16]; | |
183 | ||
184 | case BFD_RELOC_16_PCREL: | |
185 | TRACE ("BFD_RELOC_16_PCREL"); | |
186 | return &elf_howto_table[(int) R_386_PC16]; | |
187 | ||
188 | case BFD_RELOC_8: | |
189 | TRACE ("BFD_RELOC_8"); | |
190 | return &elf_howto_table[(int) R_386_8]; | |
191 | ||
192 | case BFD_RELOC_8_PCREL: | |
193 | TRACE ("BFD_RELOC_8_PCREL"); | |
194 | return &elf_howto_table[(int) R_386_PC8]; | |
195 | ||
196 | case BFD_RELOC_VTABLE_INHERIT: | |
197 | TRACE ("BFD_RELOC_VTABLE_INHERIT"); | |
198 | return &elf32_i386_vtinherit_howto; | |
199 | ||
200 | case BFD_RELOC_VTABLE_ENTRY: | |
201 | TRACE ("BFD_RELOC_VTABLE_ENTRY"); | |
202 | return &elf32_i386_vtentry_howto; | |
203 | ||
204 | default: | |
205 | break; | |
206 | } | |
207 | ||
208 | TRACE ("Unknown"); | |
209 | return 0; | |
210 | } | |
211 | ||
212 | static void | |
213 | elf_i386_info_to_howto (abfd, cache_ptr, dst) | |
7442e600 ILT |
214 | bfd *abfd ATTRIBUTE_UNUSED; |
215 | arelent *cache_ptr ATTRIBUTE_UNUSED; | |
216 | Elf32_Internal_Rela *dst ATTRIBUTE_UNUSED; | |
252b5132 RH |
217 | { |
218 | abort (); | |
219 | } | |
220 | ||
221 | static void | |
222 | elf_i386_info_to_howto_rel (abfd, cache_ptr, dst) | |
7442e600 | 223 | bfd *abfd ATTRIBUTE_UNUSED; |
252b5132 RH |
224 | arelent *cache_ptr; |
225 | Elf32_Internal_Rel *dst; | |
226 | { | |
227 | enum elf_i386_reloc_type type; | |
228 | ||
229 | type = (enum elf_i386_reloc_type) ELF32_R_TYPE (dst->r_info); | |
230 | if (type == R_386_GNU_VTINHERIT) | |
231 | cache_ptr->howto = &elf32_i386_vtinherit_howto; | |
232 | else if (type == R_386_GNU_VTENTRY) | |
233 | cache_ptr->howto = &elf32_i386_vtentry_howto; | |
a432cc3d ILT |
234 | else if (type < R_386_max |
235 | && (type < FIRST_INVALID_RELOC || type > LAST_INVALID_RELOC)) | |
236 | cache_ptr->howto = &elf_howto_table[(int) type]; | |
252b5132 RH |
237 | else |
238 | { | |
a432cc3d ILT |
239 | (*_bfd_error_handler) (_("%s: invalid relocation type %d"), |
240 | bfd_get_filename (abfd), (int) type); | |
241 | cache_ptr->howto = &elf_howto_table[(int) R_386_NONE]; | |
252b5132 RH |
242 | } |
243 | } | |
244 | ||
245 | /* Return whether a symbol name implies a local label. The UnixWare | |
246 | 2.1 cc generates temporary symbols that start with .X, so we | |
247 | recognize them here. FIXME: do other SVR4 compilers also use .X?. | |
248 | If so, we should move the .X recognition into | |
249 | _bfd_elf_is_local_label_name. */ | |
250 | ||
251 | static boolean | |
252 | elf_i386_is_local_label_name (abfd, name) | |
253 | bfd *abfd; | |
254 | const char *name; | |
255 | { | |
256 | if (name[0] == '.' && name[1] == 'X') | |
257 | return true; | |
258 | ||
259 | return _bfd_elf_is_local_label_name (abfd, name); | |
260 | } | |
261 | \f | |
262 | /* Functions for the i386 ELF linker. */ | |
263 | ||
264 | /* The name of the dynamic interpreter. This is put in the .interp | |
265 | section. */ | |
266 | ||
267 | #define ELF_DYNAMIC_INTERPRETER "/usr/lib/libc.so.1" | |
268 | ||
269 | /* The size in bytes of an entry in the procedure linkage table. */ | |
270 | ||
271 | #define PLT_ENTRY_SIZE 16 | |
272 | ||
273 | /* The first entry in an absolute procedure linkage table looks like | |
274 | this. See the SVR4 ABI i386 supplement to see how this works. */ | |
275 | ||
276 | static const bfd_byte elf_i386_plt0_entry[PLT_ENTRY_SIZE] = | |
277 | { | |
278 | 0xff, 0x35, /* pushl contents of address */ | |
279 | 0, 0, 0, 0, /* replaced with address of .got + 4. */ | |
280 | 0xff, 0x25, /* jmp indirect */ | |
281 | 0, 0, 0, 0, /* replaced with address of .got + 8. */ | |
282 | 0, 0, 0, 0 /* pad out to 16 bytes. */ | |
283 | }; | |
284 | ||
285 | /* Subsequent entries in an absolute procedure linkage table look like | |
286 | this. */ | |
287 | ||
288 | static const bfd_byte elf_i386_plt_entry[PLT_ENTRY_SIZE] = | |
289 | { | |
290 | 0xff, 0x25, /* jmp indirect */ | |
291 | 0, 0, 0, 0, /* replaced with address of this symbol in .got. */ | |
292 | 0x68, /* pushl immediate */ | |
293 | 0, 0, 0, 0, /* replaced with offset into relocation table. */ | |
294 | 0xe9, /* jmp relative */ | |
295 | 0, 0, 0, 0 /* replaced with offset to start of .plt. */ | |
296 | }; | |
297 | ||
298 | /* The first entry in a PIC procedure linkage table look like this. */ | |
299 | ||
300 | static const bfd_byte elf_i386_pic_plt0_entry[PLT_ENTRY_SIZE] = | |
301 | { | |
302 | 0xff, 0xb3, 4, 0, 0, 0, /* pushl 4(%ebx) */ | |
303 | 0xff, 0xa3, 8, 0, 0, 0, /* jmp *8(%ebx) */ | |
304 | 0, 0, 0, 0 /* pad out to 16 bytes. */ | |
305 | }; | |
306 | ||
307 | /* Subsequent entries in a PIC procedure linkage table look like this. */ | |
308 | ||
309 | static const bfd_byte elf_i386_pic_plt_entry[PLT_ENTRY_SIZE] = | |
310 | { | |
311 | 0xff, 0xa3, /* jmp *offset(%ebx) */ | |
312 | 0, 0, 0, 0, /* replaced with offset of this symbol in .got. */ | |
313 | 0x68, /* pushl immediate */ | |
314 | 0, 0, 0, 0, /* replaced with offset into relocation table. */ | |
315 | 0xe9, /* jmp relative */ | |
316 | 0, 0, 0, 0 /* replaced with offset to start of .plt. */ | |
317 | }; | |
318 | ||
319 | /* The i386 linker needs to keep track of the number of relocs that it | |
320 | decides to copy in check_relocs for each symbol. This is so that | |
321 | it can discard PC relative relocs if it doesn't need them when | |
322 | linking with -Bsymbolic. We store the information in a field | |
323 | extending the regular ELF linker hash table. */ | |
324 | ||
325 | /* This structure keeps track of the number of PC relative relocs we | |
326 | have copied for a given symbol. */ | |
327 | ||
328 | struct elf_i386_pcrel_relocs_copied | |
329 | { | |
330 | /* Next section. */ | |
331 | struct elf_i386_pcrel_relocs_copied *next; | |
332 | /* A section in dynobj. */ | |
333 | asection *section; | |
334 | /* Number of relocs copied in this section. */ | |
335 | bfd_size_type count; | |
336 | }; | |
337 | ||
338 | /* i386 ELF linker hash entry. */ | |
339 | ||
340 | struct elf_i386_link_hash_entry | |
341 | { | |
342 | struct elf_link_hash_entry root; | |
343 | ||
344 | /* Number of PC relative relocs copied for this symbol. */ | |
345 | struct elf_i386_pcrel_relocs_copied *pcrel_relocs_copied; | |
346 | }; | |
347 | ||
348 | /* i386 ELF linker hash table. */ | |
349 | ||
350 | struct elf_i386_link_hash_table | |
351 | { | |
352 | struct elf_link_hash_table root; | |
353 | }; | |
354 | ||
355 | /* Declare this now that the above structures are defined. */ | |
356 | ||
357 | static boolean elf_i386_discard_copies | |
358 | PARAMS ((struct elf_i386_link_hash_entry *, PTR)); | |
359 | ||
360 | /* Traverse an i386 ELF linker hash table. */ | |
361 | ||
362 | #define elf_i386_link_hash_traverse(table, func, info) \ | |
363 | (elf_link_hash_traverse \ | |
364 | (&(table)->root, \ | |
365 | (boolean (*) PARAMS ((struct elf_link_hash_entry *, PTR))) (func), \ | |
366 | (info))) | |
367 | ||
368 | /* Get the i386 ELF linker hash table from a link_info structure. */ | |
369 | ||
370 | #define elf_i386_hash_table(p) \ | |
371 | ((struct elf_i386_link_hash_table *) ((p)->hash)) | |
372 | ||
373 | /* Create an entry in an i386 ELF linker hash table. */ | |
374 | ||
375 | static struct bfd_hash_entry * | |
376 | elf_i386_link_hash_newfunc (entry, table, string) | |
377 | struct bfd_hash_entry *entry; | |
378 | struct bfd_hash_table *table; | |
379 | const char *string; | |
380 | { | |
381 | struct elf_i386_link_hash_entry *ret = | |
382 | (struct elf_i386_link_hash_entry *) entry; | |
383 | ||
384 | /* Allocate the structure if it has not already been allocated by a | |
385 | subclass. */ | |
386 | if (ret == (struct elf_i386_link_hash_entry *) NULL) | |
387 | ret = ((struct elf_i386_link_hash_entry *) | |
388 | bfd_hash_allocate (table, | |
389 | sizeof (struct elf_i386_link_hash_entry))); | |
390 | if (ret == (struct elf_i386_link_hash_entry *) NULL) | |
391 | return (struct bfd_hash_entry *) ret; | |
392 | ||
393 | /* Call the allocation method of the superclass. */ | |
394 | ret = ((struct elf_i386_link_hash_entry *) | |
395 | _bfd_elf_link_hash_newfunc ((struct bfd_hash_entry *) ret, | |
396 | table, string)); | |
397 | if (ret != (struct elf_i386_link_hash_entry *) NULL) | |
398 | { | |
399 | ret->pcrel_relocs_copied = NULL; | |
400 | } | |
401 | ||
402 | return (struct bfd_hash_entry *) ret; | |
403 | } | |
404 | ||
405 | /* Create an i386 ELF linker hash table. */ | |
406 | ||
407 | static struct bfd_link_hash_table * | |
408 | elf_i386_link_hash_table_create (abfd) | |
409 | bfd *abfd; | |
410 | { | |
411 | struct elf_i386_link_hash_table *ret; | |
412 | ||
413 | ret = ((struct elf_i386_link_hash_table *) | |
414 | bfd_alloc (abfd, sizeof (struct elf_i386_link_hash_table))); | |
415 | if (ret == (struct elf_i386_link_hash_table *) NULL) | |
416 | return NULL; | |
417 | ||
418 | if (! _bfd_elf_link_hash_table_init (&ret->root, abfd, | |
419 | elf_i386_link_hash_newfunc)) | |
420 | { | |
421 | bfd_release (abfd, ret); | |
422 | return NULL; | |
423 | } | |
424 | ||
425 | return &ret->root.root; | |
426 | } | |
427 | ||
428 | /* Look through the relocs for a section during the first phase, and | |
429 | allocate space in the global offset table or procedure linkage | |
430 | table. */ | |
431 | ||
432 | static boolean | |
433 | elf_i386_check_relocs (abfd, info, sec, relocs) | |
434 | bfd *abfd; | |
435 | struct bfd_link_info *info; | |
436 | asection *sec; | |
437 | const Elf_Internal_Rela *relocs; | |
438 | { | |
439 | bfd *dynobj; | |
440 | Elf_Internal_Shdr *symtab_hdr; | |
441 | struct elf_link_hash_entry **sym_hashes; | |
442 | bfd_vma *local_got_offsets; | |
443 | const Elf_Internal_Rela *rel; | |
444 | const Elf_Internal_Rela *rel_end; | |
445 | asection *sgot; | |
446 | asection *srelgot; | |
447 | asection *sreloc; | |
448 | ||
449 | if (info->relocateable) | |
450 | return true; | |
451 | ||
452 | dynobj = elf_hash_table (info)->dynobj; | |
453 | symtab_hdr = &elf_tdata (abfd)->symtab_hdr; | |
454 | sym_hashes = elf_sym_hashes (abfd); | |
455 | local_got_offsets = elf_local_got_offsets (abfd); | |
456 | ||
457 | sgot = NULL; | |
458 | srelgot = NULL; | |
459 | sreloc = NULL; | |
460 | ||
461 | rel_end = relocs + sec->reloc_count; | |
462 | for (rel = relocs; rel < rel_end; rel++) | |
463 | { | |
464 | unsigned long r_symndx; | |
465 | struct elf_link_hash_entry *h; | |
466 | ||
467 | r_symndx = ELF32_R_SYM (rel->r_info); | |
468 | ||
469 | if (r_symndx < symtab_hdr->sh_info) | |
470 | h = NULL; | |
471 | else | |
472 | h = sym_hashes[r_symndx - symtab_hdr->sh_info]; | |
473 | ||
474 | /* Some relocs require a global offset table. */ | |
475 | if (dynobj == NULL) | |
476 | { | |
477 | switch (ELF32_R_TYPE (rel->r_info)) | |
478 | { | |
479 | case R_386_GOT32: | |
480 | case R_386_GOTOFF: | |
481 | case R_386_GOTPC: | |
482 | elf_hash_table (info)->dynobj = dynobj = abfd; | |
483 | if (! _bfd_elf_create_got_section (dynobj, info)) | |
484 | return false; | |
485 | break; | |
486 | ||
487 | default: | |
488 | break; | |
489 | } | |
490 | } | |
491 | ||
492 | switch (ELF32_R_TYPE (rel->r_info)) | |
493 | { | |
494 | case R_386_GOT32: | |
495 | /* This symbol requires a global offset table entry. */ | |
496 | ||
497 | if (sgot == NULL) | |
498 | { | |
499 | sgot = bfd_get_section_by_name (dynobj, ".got"); | |
500 | BFD_ASSERT (sgot != NULL); | |
501 | } | |
502 | ||
503 | if (srelgot == NULL | |
504 | && (h != NULL || info->shared)) | |
505 | { | |
506 | srelgot = bfd_get_section_by_name (dynobj, ".rel.got"); | |
507 | if (srelgot == NULL) | |
508 | { | |
509 | srelgot = bfd_make_section (dynobj, ".rel.got"); | |
510 | if (srelgot == NULL | |
511 | || ! bfd_set_section_flags (dynobj, srelgot, | |
512 | (SEC_ALLOC | |
513 | | SEC_LOAD | |
514 | | SEC_HAS_CONTENTS | |
515 | | SEC_IN_MEMORY | |
516 | | SEC_LINKER_CREATED | |
517 | | SEC_READONLY)) | |
518 | || ! bfd_set_section_alignment (dynobj, srelgot, 2)) | |
519 | return false; | |
520 | } | |
521 | } | |
522 | ||
523 | if (h != NULL) | |
524 | { | |
525 | if (h->got.offset != (bfd_vma) -1) | |
526 | { | |
527 | /* We have already allocated space in the .got. */ | |
528 | break; | |
529 | } | |
530 | h->got.offset = sgot->_raw_size; | |
531 | ||
532 | /* Make sure this symbol is output as a dynamic symbol. */ | |
533 | if (h->dynindx == -1) | |
534 | { | |
535 | if (! bfd_elf32_link_record_dynamic_symbol (info, h)) | |
536 | return false; | |
537 | } | |
538 | ||
539 | srelgot->_raw_size += sizeof (Elf32_External_Rel); | |
540 | } | |
541 | else | |
542 | { | |
543 | /* This is a global offset table entry for a local | |
544 | symbol. */ | |
545 | if (local_got_offsets == NULL) | |
546 | { | |
547 | size_t size; | |
548 | register unsigned int i; | |
549 | ||
550 | size = symtab_hdr->sh_info * sizeof (bfd_vma); | |
551 | local_got_offsets = (bfd_vma *) bfd_alloc (abfd, size); | |
552 | if (local_got_offsets == NULL) | |
553 | return false; | |
554 | elf_local_got_offsets (abfd) = local_got_offsets; | |
555 | for (i = 0; i < symtab_hdr->sh_info; i++) | |
556 | local_got_offsets[i] = (bfd_vma) -1; | |
557 | } | |
558 | if (local_got_offsets[r_symndx] != (bfd_vma) -1) | |
559 | { | |
560 | /* We have already allocated space in the .got. */ | |
561 | break; | |
562 | } | |
563 | local_got_offsets[r_symndx] = sgot->_raw_size; | |
564 | ||
565 | if (info->shared) | |
566 | { | |
567 | /* If we are generating a shared object, we need to | |
568 | output a R_386_RELATIVE reloc so that the dynamic | |
569 | linker can adjust this GOT entry. */ | |
570 | srelgot->_raw_size += sizeof (Elf32_External_Rel); | |
571 | } | |
572 | } | |
573 | ||
574 | sgot->_raw_size += 4; | |
575 | ||
576 | break; | |
577 | ||
578 | case R_386_PLT32: | |
579 | /* This symbol requires a procedure linkage table entry. We | |
580 | actually build the entry in adjust_dynamic_symbol, | |
581 | because this might be a case of linking PIC code which is | |
582 | never referenced by a dynamic object, in which case we | |
583 | don't need to generate a procedure linkage table entry | |
584 | after all. */ | |
585 | ||
586 | /* If this is a local symbol, we resolve it directly without | |
587 | creating a procedure linkage table entry. */ | |
588 | if (h == NULL) | |
589 | continue; | |
590 | ||
591 | h->elf_link_hash_flags |= ELF_LINK_HASH_NEEDS_PLT; | |
592 | ||
593 | break; | |
594 | ||
595 | case R_386_32: | |
596 | case R_386_PC32: | |
7843f00e ILT |
597 | if (h != NULL) |
598 | h->elf_link_hash_flags |= ELF_LINK_NON_GOT_REF; | |
599 | ||
252b5132 RH |
600 | /* If we are creating a shared library, and this is a reloc |
601 | against a global symbol, or a non PC relative reloc | |
602 | against a local symbol, then we need to copy the reloc | |
603 | into the shared library. However, if we are linking with | |
604 | -Bsymbolic, we do not need to copy a reloc against a | |
605 | global symbol which is defined in an object we are | |
606 | including in the link (i.e., DEF_REGULAR is set). At | |
607 | this point we have not seen all the input files, so it is | |
608 | possible that DEF_REGULAR is not set now but will be set | |
609 | later (it is never cleared). We account for that | |
610 | possibility below by storing information in the | |
611 | pcrel_relocs_copied field of the hash table entry. */ | |
612 | if (info->shared | |
613 | && (sec->flags & SEC_ALLOC) != 0 | |
614 | && (ELF32_R_TYPE (rel->r_info) != R_386_PC32 | |
615 | || (h != NULL | |
616 | && (! info->symbolic | |
617 | || (h->elf_link_hash_flags | |
618 | & ELF_LINK_HASH_DEF_REGULAR) == 0)))) | |
619 | { | |
620 | /* When creating a shared object, we must copy these | |
621 | reloc types into the output file. We create a reloc | |
622 | section in dynobj and make room for this reloc. */ | |
623 | if (sreloc == NULL) | |
624 | { | |
625 | const char *name; | |
626 | ||
627 | name = (bfd_elf_string_from_elf_section | |
628 | (abfd, | |
629 | elf_elfheader (abfd)->e_shstrndx, | |
630 | elf_section_data (sec)->rel_hdr.sh_name)); | |
631 | if (name == NULL) | |
632 | return false; | |
633 | ||
634 | BFD_ASSERT (strncmp (name, ".rel", 4) == 0 | |
635 | && strcmp (bfd_get_section_name (abfd, sec), | |
636 | name + 4) == 0); | |
637 | ||
638 | sreloc = bfd_get_section_by_name (dynobj, name); | |
639 | if (sreloc == NULL) | |
640 | { | |
641 | flagword flags; | |
642 | ||
643 | sreloc = bfd_make_section (dynobj, name); | |
644 | flags = (SEC_HAS_CONTENTS | SEC_READONLY | |
645 | | SEC_IN_MEMORY | SEC_LINKER_CREATED); | |
646 | if ((sec->flags & SEC_ALLOC) != 0) | |
647 | flags |= SEC_ALLOC | SEC_LOAD; | |
648 | if (sreloc == NULL | |
649 | || ! bfd_set_section_flags (dynobj, sreloc, flags) | |
650 | || ! bfd_set_section_alignment (dynobj, sreloc, 2)) | |
651 | return false; | |
652 | } | |
653 | } | |
654 | ||
655 | sreloc->_raw_size += sizeof (Elf32_External_Rel); | |
656 | ||
657 | /* If we are linking with -Bsymbolic, and this is a | |
658 | global symbol, we count the number of PC relative | |
659 | relocations we have entered for this symbol, so that | |
660 | we can discard them again if the symbol is later | |
661 | defined by a regular object. Note that this function | |
662 | is only called if we are using an elf_i386 linker | |
663 | hash table, which means that h is really a pointer to | |
664 | an elf_i386_link_hash_entry. */ | |
665 | if (h != NULL && info->symbolic | |
666 | && ELF32_R_TYPE (rel->r_info) == R_386_PC32) | |
667 | { | |
668 | struct elf_i386_link_hash_entry *eh; | |
669 | struct elf_i386_pcrel_relocs_copied *p; | |
670 | ||
671 | eh = (struct elf_i386_link_hash_entry *) h; | |
672 | ||
673 | for (p = eh->pcrel_relocs_copied; p != NULL; p = p->next) | |
674 | if (p->section == sreloc) | |
675 | break; | |
676 | ||
677 | if (p == NULL) | |
678 | { | |
679 | p = ((struct elf_i386_pcrel_relocs_copied *) | |
680 | bfd_alloc (dynobj, sizeof *p)); | |
681 | if (p == NULL) | |
682 | return false; | |
683 | p->next = eh->pcrel_relocs_copied; | |
684 | eh->pcrel_relocs_copied = p; | |
685 | p->section = sreloc; | |
686 | p->count = 0; | |
687 | } | |
688 | ||
689 | ++p->count; | |
690 | } | |
691 | } | |
692 | ||
693 | break; | |
694 | ||
695 | /* This relocation describes the C++ object vtable hierarchy. | |
696 | Reconstruct it for later use during GC. */ | |
697 | case R_386_GNU_VTINHERIT: | |
698 | if (!_bfd_elf32_gc_record_vtinherit (abfd, sec, h, rel->r_offset)) | |
699 | return false; | |
700 | break; | |
701 | ||
702 | /* This relocation describes which C++ vtable entries are actually | |
703 | used. Record for later use during GC. */ | |
704 | case R_386_GNU_VTENTRY: | |
705 | if (!_bfd_elf32_gc_record_vtentry (abfd, sec, h, rel->r_offset)) | |
706 | return false; | |
707 | break; | |
708 | ||
709 | default: | |
710 | break; | |
711 | } | |
712 | } | |
713 | ||
714 | return true; | |
715 | } | |
716 | ||
717 | /* Return the section that should be marked against GC for a given | |
718 | relocation. */ | |
719 | ||
720 | static asection * | |
721 | elf_i386_gc_mark_hook (abfd, info, rel, h, sym) | |
722 | bfd *abfd; | |
7442e600 | 723 | struct bfd_link_info *info ATTRIBUTE_UNUSED; |
252b5132 RH |
724 | Elf_Internal_Rela *rel; |
725 | struct elf_link_hash_entry *h; | |
726 | Elf_Internal_Sym *sym; | |
727 | { | |
728 | if (h != NULL) | |
729 | { | |
730 | switch (ELF32_R_TYPE (rel->r_info)) | |
731 | { | |
732 | case R_386_GNU_VTINHERIT: | |
733 | case R_386_GNU_VTENTRY: | |
734 | break; | |
735 | ||
736 | default: | |
737 | switch (h->root.type) | |
738 | { | |
739 | case bfd_link_hash_defined: | |
740 | case bfd_link_hash_defweak: | |
741 | return h->root.u.def.section; | |
742 | ||
743 | case bfd_link_hash_common: | |
744 | return h->root.u.c.p->section; | |
745 | ||
746 | default: | |
747 | break; | |
748 | } | |
749 | } | |
750 | } | |
751 | else | |
752 | { | |
753 | if (!(elf_bad_symtab (abfd) | |
754 | && ELF_ST_BIND (sym->st_info) != STB_LOCAL) | |
755 | && ! ((sym->st_shndx <= 0 || sym->st_shndx >= SHN_LORESERVE) | |
756 | && sym->st_shndx != SHN_COMMON)) | |
757 | { | |
758 | return bfd_section_from_elf_index (abfd, sym->st_shndx); | |
759 | } | |
760 | } | |
761 | ||
762 | return NULL; | |
763 | } | |
764 | ||
765 | /* Update the got entry reference counts for the section being removed. */ | |
766 | ||
767 | static boolean | |
768 | elf_i386_gc_sweep_hook (abfd, info, sec, relocs) | |
7442e600 ILT |
769 | bfd *abfd ATTRIBUTE_UNUSED; |
770 | struct bfd_link_info *info ATTRIBUTE_UNUSED; | |
771 | asection *sec ATTRIBUTE_UNUSED; | |
772 | const Elf_Internal_Rela *relocs ATTRIBUTE_UNUSED; | |
252b5132 RH |
773 | { |
774 | /* ??? It would seem that the existing i386 code does no sort | |
775 | of reference counting or whatnot on its GOT and PLT entries, | |
776 | so it is not possible to garbage collect them at this time. */ | |
777 | ||
778 | return true; | |
779 | } | |
780 | ||
781 | /* Adjust a symbol defined by a dynamic object and referenced by a | |
782 | regular object. The current definition is in some section of the | |
783 | dynamic object, but we're not including those sections. We have to | |
784 | change the definition to something the rest of the link can | |
785 | understand. */ | |
786 | ||
787 | static boolean | |
788 | elf_i386_adjust_dynamic_symbol (info, h) | |
789 | struct bfd_link_info *info; | |
790 | struct elf_link_hash_entry *h; | |
791 | { | |
792 | bfd *dynobj; | |
793 | asection *s; | |
794 | unsigned int power_of_two; | |
795 | ||
796 | dynobj = elf_hash_table (info)->dynobj; | |
797 | ||
798 | /* Make sure we know what is going on here. */ | |
799 | BFD_ASSERT (dynobj != NULL | |
800 | && ((h->elf_link_hash_flags & ELF_LINK_HASH_NEEDS_PLT) | |
801 | || h->weakdef != NULL | |
802 | || ((h->elf_link_hash_flags | |
803 | & ELF_LINK_HASH_DEF_DYNAMIC) != 0 | |
804 | && (h->elf_link_hash_flags | |
805 | & ELF_LINK_HASH_REF_REGULAR) != 0 | |
806 | && (h->elf_link_hash_flags | |
807 | & ELF_LINK_HASH_DEF_REGULAR) == 0))); | |
808 | ||
809 | /* If this is a function, put it in the procedure linkage table. We | |
810 | will fill in the contents of the procedure linkage table later, | |
811 | when we know the address of the .got section. */ | |
812 | if (h->type == STT_FUNC | |
813 | || (h->elf_link_hash_flags & ELF_LINK_HASH_NEEDS_PLT) != 0) | |
814 | { | |
815 | if (! info->shared | |
816 | && (h->elf_link_hash_flags & ELF_LINK_HASH_DEF_DYNAMIC) == 0 | |
817 | && (h->elf_link_hash_flags & ELF_LINK_HASH_REF_DYNAMIC) == 0) | |
818 | { | |
819 | /* This case can occur if we saw a PLT32 reloc in an input | |
820 | file, but the symbol was never referred to by a dynamic | |
821 | object. In such a case, we don't actually need to build | |
822 | a procedure linkage table, and we can just do a PC32 | |
823 | reloc instead. */ | |
824 | BFD_ASSERT ((h->elf_link_hash_flags & ELF_LINK_HASH_NEEDS_PLT) != 0); | |
825 | return true; | |
826 | } | |
827 | ||
828 | /* Make sure this symbol is output as a dynamic symbol. */ | |
829 | if (h->dynindx == -1) | |
830 | { | |
831 | if (! bfd_elf32_link_record_dynamic_symbol (info, h)) | |
832 | return false; | |
833 | } | |
834 | ||
835 | s = bfd_get_section_by_name (dynobj, ".plt"); | |
836 | BFD_ASSERT (s != NULL); | |
837 | ||
838 | /* If this is the first .plt entry, make room for the special | |
839 | first entry. */ | |
840 | if (s->_raw_size == 0) | |
841 | s->_raw_size += PLT_ENTRY_SIZE; | |
842 | ||
843 | /* If this symbol is not defined in a regular file, and we are | |
844 | not generating a shared library, then set the symbol to this | |
845 | location in the .plt. This is required to make function | |
846 | pointers compare as equal between the normal executable and | |
847 | the shared library. */ | |
848 | if (! info->shared | |
849 | && (h->elf_link_hash_flags & ELF_LINK_HASH_DEF_REGULAR) == 0) | |
850 | { | |
851 | h->root.u.def.section = s; | |
852 | h->root.u.def.value = s->_raw_size; | |
853 | } | |
854 | ||
855 | h->plt.offset = s->_raw_size; | |
856 | ||
857 | /* Make room for this entry. */ | |
858 | s->_raw_size += PLT_ENTRY_SIZE; | |
859 | ||
860 | /* We also need to make an entry in the .got.plt section, which | |
861 | will be placed in the .got section by the linker script. */ | |
862 | ||
863 | s = bfd_get_section_by_name (dynobj, ".got.plt"); | |
864 | BFD_ASSERT (s != NULL); | |
865 | s->_raw_size += 4; | |
866 | ||
867 | /* We also need to make an entry in the .rel.plt section. */ | |
868 | ||
869 | s = bfd_get_section_by_name (dynobj, ".rel.plt"); | |
870 | BFD_ASSERT (s != NULL); | |
871 | s->_raw_size += sizeof (Elf32_External_Rel); | |
872 | ||
873 | return true; | |
874 | } | |
875 | ||
876 | /* If this is a weak symbol, and there is a real definition, the | |
877 | processor independent code will have arranged for us to see the | |
878 | real definition first, and we can just use the same value. */ | |
879 | if (h->weakdef != NULL) | |
880 | { | |
881 | BFD_ASSERT (h->weakdef->root.type == bfd_link_hash_defined | |
882 | || h->weakdef->root.type == bfd_link_hash_defweak); | |
883 | h->root.u.def.section = h->weakdef->root.u.def.section; | |
884 | h->root.u.def.value = h->weakdef->root.u.def.value; | |
885 | return true; | |
886 | } | |
887 | ||
888 | /* This is a reference to a symbol defined by a dynamic object which | |
889 | is not a function. */ | |
890 | ||
891 | /* If we are creating a shared library, we must presume that the | |
892 | only references to the symbol are via the global offset table. | |
893 | For such cases we need not do anything here; the relocations will | |
894 | be handled correctly by relocate_section. */ | |
895 | if (info->shared) | |
896 | return true; | |
897 | ||
7843f00e ILT |
898 | /* If there are no references to this symbol that do not use the |
899 | GOT, we don't need to generate a copy reloc. */ | |
900 | if ((h->elf_link_hash_flags & ELF_LINK_NON_GOT_REF) == 0) | |
901 | return true; | |
902 | ||
252b5132 RH |
903 | /* We must allocate the symbol in our .dynbss section, which will |
904 | become part of the .bss section of the executable. There will be | |
905 | an entry for this symbol in the .dynsym section. The dynamic | |
906 | object will contain position independent code, so all references | |
907 | from the dynamic object to this symbol will go through the global | |
908 | offset table. The dynamic linker will use the .dynsym entry to | |
909 | determine the address it must put in the global offset table, so | |
910 | both the dynamic object and the regular object will refer to the | |
911 | same memory location for the variable. */ | |
912 | ||
913 | s = bfd_get_section_by_name (dynobj, ".dynbss"); | |
914 | BFD_ASSERT (s != NULL); | |
915 | ||
916 | /* We must generate a R_386_COPY reloc to tell the dynamic linker to | |
917 | copy the initial value out of the dynamic object and into the | |
918 | runtime process image. We need to remember the offset into the | |
919 | .rel.bss section we are going to use. */ | |
920 | if ((h->root.u.def.section->flags & SEC_ALLOC) != 0) | |
921 | { | |
922 | asection *srel; | |
923 | ||
924 | srel = bfd_get_section_by_name (dynobj, ".rel.bss"); | |
925 | BFD_ASSERT (srel != NULL); | |
926 | srel->_raw_size += sizeof (Elf32_External_Rel); | |
927 | h->elf_link_hash_flags |= ELF_LINK_HASH_NEEDS_COPY; | |
928 | } | |
929 | ||
930 | /* We need to figure out the alignment required for this symbol. I | |
931 | have no idea how ELF linkers handle this. */ | |
932 | power_of_two = bfd_log2 (h->size); | |
933 | if (power_of_two > 3) | |
934 | power_of_two = 3; | |
935 | ||
936 | /* Apply the required alignment. */ | |
937 | s->_raw_size = BFD_ALIGN (s->_raw_size, | |
938 | (bfd_size_type) (1 << power_of_two)); | |
939 | if (power_of_two > bfd_get_section_alignment (dynobj, s)) | |
940 | { | |
941 | if (! bfd_set_section_alignment (dynobj, s, power_of_two)) | |
942 | return false; | |
943 | } | |
944 | ||
945 | /* Define the symbol as being at this point in the section. */ | |
946 | h->root.u.def.section = s; | |
947 | h->root.u.def.value = s->_raw_size; | |
948 | ||
949 | /* Increment the section size to make room for the symbol. */ | |
950 | s->_raw_size += h->size; | |
951 | ||
952 | return true; | |
953 | } | |
954 | ||
955 | /* Set the sizes of the dynamic sections. */ | |
956 | ||
957 | static boolean | |
958 | elf_i386_size_dynamic_sections (output_bfd, info) | |
959 | bfd *output_bfd; | |
960 | struct bfd_link_info *info; | |
961 | { | |
962 | bfd *dynobj; | |
963 | asection *s; | |
964 | boolean plt; | |
965 | boolean relocs; | |
966 | boolean reltext; | |
967 | ||
968 | dynobj = elf_hash_table (info)->dynobj; | |
969 | BFD_ASSERT (dynobj != NULL); | |
970 | ||
971 | if (elf_hash_table (info)->dynamic_sections_created) | |
972 | { | |
973 | /* Set the contents of the .interp section to the interpreter. */ | |
974 | if (! info->shared) | |
975 | { | |
976 | s = bfd_get_section_by_name (dynobj, ".interp"); | |
977 | BFD_ASSERT (s != NULL); | |
978 | s->_raw_size = sizeof ELF_DYNAMIC_INTERPRETER; | |
979 | s->contents = (unsigned char *) ELF_DYNAMIC_INTERPRETER; | |
980 | } | |
981 | } | |
982 | else | |
983 | { | |
984 | /* We may have created entries in the .rel.got section. | |
985 | However, if we are not creating the dynamic sections, we will | |
986 | not actually use these entries. Reset the size of .rel.got, | |
987 | which will cause it to get stripped from the output file | |
988 | below. */ | |
989 | s = bfd_get_section_by_name (dynobj, ".rel.got"); | |
990 | if (s != NULL) | |
991 | s->_raw_size = 0; | |
992 | } | |
993 | ||
994 | /* If this is a -Bsymbolic shared link, then we need to discard all | |
995 | PC relative relocs against symbols defined in a regular object. | |
996 | We allocated space for them in the check_relocs routine, but we | |
997 | will not fill them in in the relocate_section routine. */ | |
998 | if (info->shared && info->symbolic) | |
999 | elf_i386_link_hash_traverse (elf_i386_hash_table (info), | |
1000 | elf_i386_discard_copies, | |
1001 | (PTR) NULL); | |
1002 | ||
1003 | /* The check_relocs and adjust_dynamic_symbol entry points have | |
1004 | determined the sizes of the various dynamic sections. Allocate | |
1005 | memory for them. */ | |
1006 | plt = false; | |
1007 | relocs = false; | |
1008 | reltext = false; | |
1009 | for (s = dynobj->sections; s != NULL; s = s->next) | |
1010 | { | |
1011 | const char *name; | |
1012 | boolean strip; | |
1013 | ||
1014 | if ((s->flags & SEC_LINKER_CREATED) == 0) | |
1015 | continue; | |
1016 | ||
1017 | /* It's OK to base decisions on the section name, because none | |
1018 | of the dynobj section names depend upon the input files. */ | |
1019 | name = bfd_get_section_name (dynobj, s); | |
1020 | ||
1021 | strip = false; | |
1022 | ||
1023 | if (strcmp (name, ".plt") == 0) | |
1024 | { | |
1025 | if (s->_raw_size == 0) | |
1026 | { | |
1027 | /* Strip this section if we don't need it; see the | |
1028 | comment below. */ | |
1029 | strip = true; | |
1030 | } | |
1031 | else | |
1032 | { | |
1033 | /* Remember whether there is a PLT. */ | |
1034 | plt = true; | |
1035 | } | |
1036 | } | |
1037 | else if (strncmp (name, ".rel", 4) == 0) | |
1038 | { | |
1039 | if (s->_raw_size == 0) | |
1040 | { | |
1041 | /* If we don't need this section, strip it from the | |
1042 | output file. This is mostly to handle .rel.bss and | |
1043 | .rel.plt. We must create both sections in | |
1044 | create_dynamic_sections, because they must be created | |
1045 | before the linker maps input sections to output | |
1046 | sections. The linker does that before | |
1047 | adjust_dynamic_symbol is called, and it is that | |
1048 | function which decides whether anything needs to go | |
1049 | into these sections. */ | |
1050 | strip = true; | |
1051 | } | |
1052 | else | |
1053 | { | |
1054 | asection *target; | |
1055 | ||
1056 | /* Remember whether there are any reloc sections other | |
1057 | than .rel.plt. */ | |
1058 | if (strcmp (name, ".rel.plt") != 0) | |
1059 | { | |
1060 | const char *outname; | |
1061 | ||
1062 | relocs = true; | |
1063 | ||
1064 | /* If this relocation section applies to a read only | |
1065 | section, then we probably need a DT_TEXTREL | |
1066 | entry. The entries in the .rel.plt section | |
1067 | really apply to the .got section, which we | |
1068 | created ourselves and so know is not readonly. */ | |
1069 | outname = bfd_get_section_name (output_bfd, | |
1070 | s->output_section); | |
1071 | target = bfd_get_section_by_name (output_bfd, outname + 4); | |
1072 | if (target != NULL | |
1073 | && (target->flags & SEC_READONLY) != 0 | |
1074 | && (target->flags & SEC_ALLOC) != 0) | |
1075 | reltext = true; | |
1076 | } | |
1077 | ||
1078 | /* We use the reloc_count field as a counter if we need | |
1079 | to copy relocs into the output file. */ | |
1080 | s->reloc_count = 0; | |
1081 | } | |
1082 | } | |
1083 | else if (strncmp (name, ".got", 4) != 0) | |
1084 | { | |
1085 | /* It's not one of our sections, so don't allocate space. */ | |
1086 | continue; | |
1087 | } | |
1088 | ||
1089 | if (strip) | |
1090 | { | |
7f8d5fc9 | 1091 | _bfd_strip_section_from_output (info, s); |
252b5132 RH |
1092 | continue; |
1093 | } | |
1094 | ||
1095 | /* Allocate memory for the section contents. */ | |
1096 | s->contents = (bfd_byte *) bfd_alloc (dynobj, s->_raw_size); | |
1097 | if (s->contents == NULL && s->_raw_size != 0) | |
1098 | return false; | |
1099 | } | |
1100 | ||
1101 | if (elf_hash_table (info)->dynamic_sections_created) | |
1102 | { | |
1103 | /* Add some entries to the .dynamic section. We fill in the | |
1104 | values later, in elf_i386_finish_dynamic_sections, but we | |
1105 | must add the entries now so that we get the correct size for | |
1106 | the .dynamic section. The DT_DEBUG entry is filled in by the | |
1107 | dynamic linker and used by the debugger. */ | |
1108 | if (! info->shared) | |
1109 | { | |
1110 | if (! bfd_elf32_add_dynamic_entry (info, DT_DEBUG, 0)) | |
1111 | return false; | |
1112 | } | |
1113 | ||
1114 | if (plt) | |
1115 | { | |
1116 | if (! bfd_elf32_add_dynamic_entry (info, DT_PLTGOT, 0) | |
1117 | || ! bfd_elf32_add_dynamic_entry (info, DT_PLTRELSZ, 0) | |
1118 | || ! bfd_elf32_add_dynamic_entry (info, DT_PLTREL, DT_REL) | |
1119 | || ! bfd_elf32_add_dynamic_entry (info, DT_JMPREL, 0)) | |
1120 | return false; | |
1121 | } | |
1122 | ||
1123 | if (relocs) | |
1124 | { | |
1125 | if (! bfd_elf32_add_dynamic_entry (info, DT_REL, 0) | |
1126 | || ! bfd_elf32_add_dynamic_entry (info, DT_RELSZ, 0) | |
1127 | || ! bfd_elf32_add_dynamic_entry (info, DT_RELENT, | |
1128 | sizeof (Elf32_External_Rel))) | |
1129 | return false; | |
1130 | } | |
1131 | ||
1132 | if (reltext) | |
1133 | { | |
1134 | if (! bfd_elf32_add_dynamic_entry (info, DT_TEXTREL, 0)) | |
1135 | return false; | |
1136 | } | |
1137 | } | |
1138 | ||
1139 | return true; | |
1140 | } | |
1141 | ||
1142 | /* This function is called via elf_i386_link_hash_traverse if we are | |
1143 | creating a shared object with -Bsymbolic. It discards the space | |
1144 | allocated to copy PC relative relocs against symbols which are | |
1145 | defined in regular objects. We allocated space for them in the | |
1146 | check_relocs routine, but we won't fill them in in the | |
1147 | relocate_section routine. */ | |
1148 | ||
1149 | /*ARGSUSED*/ | |
1150 | static boolean | |
1151 | elf_i386_discard_copies (h, ignore) | |
1152 | struct elf_i386_link_hash_entry *h; | |
7442e600 | 1153 | PTR ignore ATTRIBUTE_UNUSED; |
252b5132 RH |
1154 | { |
1155 | struct elf_i386_pcrel_relocs_copied *s; | |
1156 | ||
1157 | /* We only discard relocs for symbols defined in a regular object. */ | |
1158 | if ((h->root.elf_link_hash_flags & ELF_LINK_HASH_DEF_REGULAR) == 0) | |
1159 | return true; | |
1160 | ||
1161 | for (s = h->pcrel_relocs_copied; s != NULL; s = s->next) | |
1162 | s->section->_raw_size -= s->count * sizeof (Elf32_External_Rel); | |
1163 | ||
1164 | return true; | |
1165 | } | |
1166 | ||
1167 | /* Relocate an i386 ELF section. */ | |
1168 | ||
1169 | static boolean | |
1170 | elf_i386_relocate_section (output_bfd, info, input_bfd, input_section, | |
1171 | contents, relocs, local_syms, local_sections) | |
1172 | bfd *output_bfd; | |
1173 | struct bfd_link_info *info; | |
1174 | bfd *input_bfd; | |
1175 | asection *input_section; | |
1176 | bfd_byte *contents; | |
1177 | Elf_Internal_Rela *relocs; | |
1178 | Elf_Internal_Sym *local_syms; | |
1179 | asection **local_sections; | |
1180 | { | |
1181 | bfd *dynobj; | |
1182 | Elf_Internal_Shdr *symtab_hdr; | |
1183 | struct elf_link_hash_entry **sym_hashes; | |
1184 | bfd_vma *local_got_offsets; | |
1185 | asection *sgot; | |
1186 | asection *splt; | |
1187 | asection *sreloc; | |
1188 | Elf_Internal_Rela *rel; | |
1189 | Elf_Internal_Rela *relend; | |
1190 | ||
1191 | dynobj = elf_hash_table (info)->dynobj; | |
1192 | symtab_hdr = &elf_tdata (input_bfd)->symtab_hdr; | |
1193 | sym_hashes = elf_sym_hashes (input_bfd); | |
1194 | local_got_offsets = elf_local_got_offsets (input_bfd); | |
1195 | ||
1196 | sgot = NULL; | |
1197 | splt = NULL; | |
1198 | sreloc = NULL; | |
1199 | ||
1200 | rel = relocs; | |
1201 | relend = relocs + input_section->reloc_count; | |
1202 | for (; rel < relend; rel++) | |
1203 | { | |
1204 | int r_type; | |
1205 | reloc_howto_type *howto; | |
1206 | unsigned long r_symndx; | |
1207 | struct elf_link_hash_entry *h; | |
1208 | Elf_Internal_Sym *sym; | |
1209 | asection *sec; | |
1210 | bfd_vma relocation; | |
1211 | bfd_reloc_status_type r; | |
1212 | ||
1213 | r_type = ELF32_R_TYPE (rel->r_info); | |
1214 | if (r_type == R_386_GNU_VTINHERIT | |
1215 | || r_type == R_386_GNU_VTENTRY) | |
1216 | continue; | |
1217 | if (r_type < 0 | |
1218 | || r_type >= (int) R_386_max | |
1219 | || (r_type >= (int) FIRST_INVALID_RELOC | |
1220 | && r_type <= (int) LAST_INVALID_RELOC)) | |
1221 | { | |
1222 | bfd_set_error (bfd_error_bad_value); | |
1223 | return false; | |
1224 | } | |
1225 | howto = elf_howto_table + r_type; | |
1226 | ||
1227 | r_symndx = ELF32_R_SYM (rel->r_info); | |
1228 | ||
1229 | if (info->relocateable) | |
1230 | { | |
1231 | /* This is a relocateable link. We don't have to change | |
1232 | anything, unless the reloc is against a section symbol, | |
1233 | in which case we have to adjust according to where the | |
1234 | section symbol winds up in the output section. */ | |
1235 | if (r_symndx < symtab_hdr->sh_info) | |
1236 | { | |
1237 | sym = local_syms + r_symndx; | |
1238 | if (ELF_ST_TYPE (sym->st_info) == STT_SECTION) | |
1239 | { | |
1240 | bfd_vma val; | |
1241 | ||
1242 | sec = local_sections[r_symndx]; | |
1243 | val = bfd_get_32 (input_bfd, contents + rel->r_offset); | |
1244 | val += sec->output_offset + sym->st_value; | |
1245 | bfd_put_32 (input_bfd, val, contents + rel->r_offset); | |
1246 | } | |
1247 | } | |
1248 | ||
1249 | continue; | |
1250 | } | |
1251 | ||
1252 | /* This is a final link. */ | |
1253 | h = NULL; | |
1254 | sym = NULL; | |
1255 | sec = NULL; | |
1256 | if (r_symndx < symtab_hdr->sh_info) | |
1257 | { | |
1258 | sym = local_syms + r_symndx; | |
1259 | sec = local_sections[r_symndx]; | |
1260 | relocation = (sec->output_section->vma | |
1261 | + sec->output_offset | |
1262 | + sym->st_value); | |
1263 | } | |
1264 | else | |
1265 | { | |
1266 | h = sym_hashes[r_symndx - symtab_hdr->sh_info]; | |
1267 | while (h->root.type == bfd_link_hash_indirect | |
1268 | || h->root.type == bfd_link_hash_warning) | |
1269 | h = (struct elf_link_hash_entry *) h->root.u.i.link; | |
1270 | if (h->root.type == bfd_link_hash_defined | |
1271 | || h->root.type == bfd_link_hash_defweak) | |
1272 | { | |
1273 | sec = h->root.u.def.section; | |
1274 | if (r_type == R_386_GOTPC | |
1275 | || (r_type == R_386_PLT32 | |
1276 | && h->plt.offset != (bfd_vma) -1) | |
1277 | || (r_type == R_386_GOT32 | |
1278 | && elf_hash_table (info)->dynamic_sections_created | |
1279 | && (! info->shared | |
1280 | || (! info->symbolic && h->dynindx != -1) | |
1281 | || (h->elf_link_hash_flags | |
1282 | & ELF_LINK_HASH_DEF_REGULAR) == 0)) | |
1283 | || (info->shared | |
1284 | && ((! info->symbolic && h->dynindx != -1) | |
1285 | || (h->elf_link_hash_flags | |
1286 | & ELF_LINK_HASH_DEF_REGULAR) == 0) | |
1287 | && (r_type == R_386_32 | |
1288 | || r_type == R_386_PC32) | |
1289 | && ((input_section->flags & SEC_ALLOC) != 0 | |
1290 | /* DWARF will emit R_386_32 relocations in its | |
1291 | sections against symbols defined externally | |
1292 | in shared libraries. We can't do anything | |
1293 | with them here. */ | |
1294 | || (input_section->flags & SEC_DEBUGGING) != 0))) | |
1295 | { | |
1296 | /* In these cases, we don't need the relocation | |
1297 | value. We check specially because in some | |
1298 | obscure cases sec->output_section will be NULL. */ | |
1299 | relocation = 0; | |
1300 | } | |
1301 | else if (sec->output_section == NULL) | |
1302 | { | |
1303 | (*_bfd_error_handler) | |
1304 | (_("%s: warning: unresolvable relocation against symbol `%s' from %s section"), | |
1305 | bfd_get_filename (input_bfd), h->root.root.string, | |
1306 | bfd_get_section_name (input_bfd, input_section)); | |
1307 | relocation = 0; | |
1308 | } | |
1309 | else | |
1310 | relocation = (h->root.u.def.value | |
1311 | + sec->output_section->vma | |
1312 | + sec->output_offset); | |
1313 | } | |
1314 | else if (h->root.type == bfd_link_hash_undefweak) | |
1315 | relocation = 0; | |
1316 | else if (info->shared && !info->symbolic && !info->no_undefined) | |
1317 | relocation = 0; | |
1318 | else | |
1319 | { | |
1320 | if (! ((*info->callbacks->undefined_symbol) | |
1321 | (info, h->root.root.string, input_bfd, | |
1322 | input_section, rel->r_offset))) | |
1323 | return false; | |
1324 | relocation = 0; | |
1325 | } | |
1326 | } | |
1327 | ||
1328 | switch (r_type) | |
1329 | { | |
1330 | case R_386_GOT32: | |
1331 | /* Relocation is to the entry for this symbol in the global | |
1332 | offset table. */ | |
1333 | if (sgot == NULL) | |
1334 | { | |
1335 | sgot = bfd_get_section_by_name (dynobj, ".got"); | |
1336 | BFD_ASSERT (sgot != NULL); | |
1337 | } | |
1338 | ||
1339 | if (h != NULL) | |
1340 | { | |
1341 | bfd_vma off; | |
1342 | ||
1343 | off = h->got.offset; | |
1344 | BFD_ASSERT (off != (bfd_vma) -1); | |
1345 | ||
1346 | if (! elf_hash_table (info)->dynamic_sections_created | |
1347 | || (info->shared | |
1348 | && (info->symbolic || h->dynindx == -1) | |
1349 | && (h->elf_link_hash_flags & ELF_LINK_HASH_DEF_REGULAR))) | |
1350 | { | |
1351 | /* This is actually a static link, or it is a | |
1352 | -Bsymbolic link and the symbol is defined | |
1353 | locally, or the symbol was forced to be local | |
1354 | because of a version file. We must initialize | |
1355 | this entry in the global offset table. Since the | |
1356 | offset must always be a multiple of 4, we use the | |
1357 | least significant bit to record whether we have | |
1358 | initialized it already. | |
1359 | ||
1360 | When doing a dynamic link, we create a .rel.got | |
1361 | relocation entry to initialize the value. This | |
1362 | is done in the finish_dynamic_symbol routine. */ | |
1363 | if ((off & 1) != 0) | |
1364 | off &= ~1; | |
1365 | else | |
1366 | { | |
1367 | bfd_put_32 (output_bfd, relocation, | |
1368 | sgot->contents + off); | |
1369 | h->got.offset |= 1; | |
1370 | } | |
1371 | } | |
1372 | ||
1373 | relocation = sgot->output_offset + off; | |
1374 | } | |
1375 | else | |
1376 | { | |
1377 | bfd_vma off; | |
1378 | ||
1379 | BFD_ASSERT (local_got_offsets != NULL | |
1380 | && local_got_offsets[r_symndx] != (bfd_vma) -1); | |
1381 | ||
1382 | off = local_got_offsets[r_symndx]; | |
1383 | ||
1384 | /* The offset must always be a multiple of 4. We use | |
1385 | the least significant bit to record whether we have | |
1386 | already generated the necessary reloc. */ | |
1387 | if ((off & 1) != 0) | |
1388 | off &= ~1; | |
1389 | else | |
1390 | { | |
1391 | bfd_put_32 (output_bfd, relocation, sgot->contents + off); | |
1392 | ||
1393 | if (info->shared) | |
1394 | { | |
1395 | asection *srelgot; | |
1396 | Elf_Internal_Rel outrel; | |
1397 | ||
1398 | srelgot = bfd_get_section_by_name (dynobj, ".rel.got"); | |
1399 | BFD_ASSERT (srelgot != NULL); | |
1400 | ||
1401 | outrel.r_offset = (sgot->output_section->vma | |
1402 | + sgot->output_offset | |
1403 | + off); | |
1404 | outrel.r_info = ELF32_R_INFO (0, R_386_RELATIVE); | |
1405 | bfd_elf32_swap_reloc_out (output_bfd, &outrel, | |
1406 | (((Elf32_External_Rel *) | |
1407 | srelgot->contents) | |
1408 | + srelgot->reloc_count)); | |
1409 | ++srelgot->reloc_count; | |
1410 | } | |
1411 | ||
1412 | local_got_offsets[r_symndx] |= 1; | |
1413 | } | |
1414 | ||
1415 | relocation = sgot->output_offset + off; | |
1416 | } | |
1417 | ||
1418 | break; | |
1419 | ||
1420 | case R_386_GOTOFF: | |
1421 | /* Relocation is relative to the start of the global offset | |
1422 | table. */ | |
1423 | ||
1424 | if (sgot == NULL) | |
1425 | { | |
1426 | sgot = bfd_get_section_by_name (dynobj, ".got"); | |
1427 | BFD_ASSERT (sgot != NULL); | |
1428 | } | |
1429 | ||
1430 | /* Note that sgot->output_offset is not involved in this | |
1431 | calculation. We always want the start of .got. If we | |
1432 | defined _GLOBAL_OFFSET_TABLE in a different way, as is | |
1433 | permitted by the ABI, we might have to change this | |
1434 | calculation. */ | |
1435 | relocation -= sgot->output_section->vma; | |
1436 | ||
1437 | break; | |
1438 | ||
1439 | case R_386_GOTPC: | |
1440 | /* Use global offset table as symbol value. */ | |
1441 | ||
1442 | if (sgot == NULL) | |
1443 | { | |
1444 | sgot = bfd_get_section_by_name (dynobj, ".got"); | |
1445 | BFD_ASSERT (sgot != NULL); | |
1446 | } | |
1447 | ||
1448 | relocation = sgot->output_section->vma; | |
1449 | ||
1450 | break; | |
1451 | ||
1452 | case R_386_PLT32: | |
1453 | /* Relocation is to the entry for this symbol in the | |
1454 | procedure linkage table. */ | |
1455 | ||
1456 | /* Resolve a PLT32 reloc again a local symbol directly, | |
1457 | without using the procedure linkage table. */ | |
1458 | if (h == NULL) | |
1459 | break; | |
1460 | ||
1461 | if (h->plt.offset == (bfd_vma) -1) | |
1462 | { | |
1463 | /* We didn't make a PLT entry for this symbol. This | |
1464 | happens when statically linking PIC code, or when | |
1465 | using -Bsymbolic. */ | |
1466 | break; | |
1467 | } | |
1468 | ||
1469 | if (splt == NULL) | |
1470 | { | |
1471 | splt = bfd_get_section_by_name (dynobj, ".plt"); | |
1472 | BFD_ASSERT (splt != NULL); | |
1473 | } | |
1474 | ||
1475 | relocation = (splt->output_section->vma | |
1476 | + splt->output_offset | |
1477 | + h->plt.offset); | |
1478 | ||
1479 | break; | |
1480 | ||
1481 | case R_386_32: | |
1482 | case R_386_PC32: | |
1483 | if (info->shared | |
1484 | && (input_section->flags & SEC_ALLOC) != 0 | |
1485 | && (r_type != R_386_PC32 | |
1486 | || (h != NULL | |
1487 | && h->dynindx != -1 | |
1488 | && (! info->symbolic | |
1489 | || (h->elf_link_hash_flags | |
1490 | & ELF_LINK_HASH_DEF_REGULAR) == 0)))) | |
1491 | { | |
1492 | Elf_Internal_Rel outrel; | |
1493 | boolean skip, relocate; | |
1494 | ||
1495 | /* When generating a shared object, these relocations | |
1496 | are copied into the output file to be resolved at run | |
1497 | time. */ | |
1498 | ||
1499 | if (sreloc == NULL) | |
1500 | { | |
1501 | const char *name; | |
1502 | ||
1503 | name = (bfd_elf_string_from_elf_section | |
1504 | (input_bfd, | |
1505 | elf_elfheader (input_bfd)->e_shstrndx, | |
1506 | elf_section_data (input_section)->rel_hdr.sh_name)); | |
1507 | if (name == NULL) | |
1508 | return false; | |
1509 | ||
1510 | BFD_ASSERT (strncmp (name, ".rel", 4) == 0 | |
1511 | && strcmp (bfd_get_section_name (input_bfd, | |
1512 | input_section), | |
1513 | name + 4) == 0); | |
1514 | ||
1515 | sreloc = bfd_get_section_by_name (dynobj, name); | |
1516 | BFD_ASSERT (sreloc != NULL); | |
1517 | } | |
1518 | ||
1519 | skip = false; | |
1520 | ||
1521 | if (elf_section_data (input_section)->stab_info == NULL) | |
1522 | outrel.r_offset = rel->r_offset; | |
1523 | else | |
1524 | { | |
1525 | bfd_vma off; | |
1526 | ||
1527 | off = (_bfd_stab_section_offset | |
1528 | (output_bfd, &elf_hash_table (info)->stab_info, | |
1529 | input_section, | |
1530 | &elf_section_data (input_section)->stab_info, | |
1531 | rel->r_offset)); | |
1532 | if (off == (bfd_vma) -1) | |
1533 | skip = true; | |
1534 | outrel.r_offset = off; | |
1535 | } | |
1536 | ||
1537 | outrel.r_offset += (input_section->output_section->vma | |
1538 | + input_section->output_offset); | |
1539 | ||
1540 | if (skip) | |
1541 | { | |
1542 | memset (&outrel, 0, sizeof outrel); | |
1543 | relocate = false; | |
1544 | } | |
1545 | else if (r_type == R_386_PC32) | |
1546 | { | |
1547 | BFD_ASSERT (h != NULL && h->dynindx != -1); | |
1548 | relocate = false; | |
1549 | outrel.r_info = ELF32_R_INFO (h->dynindx, R_386_PC32); | |
1550 | } | |
1551 | else | |
1552 | { | |
1553 | /* h->dynindx may be -1 if this symbol was marked to | |
1554 | become local. */ | |
1555 | if (h == NULL | |
1556 | || ((info->symbolic || h->dynindx == -1) | |
1557 | && (h->elf_link_hash_flags | |
1558 | & ELF_LINK_HASH_DEF_REGULAR) != 0)) | |
1559 | { | |
1560 | relocate = true; | |
1561 | outrel.r_info = ELF32_R_INFO (0, R_386_RELATIVE); | |
1562 | } | |
1563 | else | |
1564 | { | |
1565 | BFD_ASSERT (h->dynindx != -1); | |
1566 | relocate = false; | |
1567 | outrel.r_info = ELF32_R_INFO (h->dynindx, R_386_32); | |
1568 | } | |
1569 | } | |
1570 | ||
1571 | bfd_elf32_swap_reloc_out (output_bfd, &outrel, | |
1572 | (((Elf32_External_Rel *) | |
1573 | sreloc->contents) | |
1574 | + sreloc->reloc_count)); | |
1575 | ++sreloc->reloc_count; | |
1576 | ||
1577 | /* If this reloc is against an external symbol, we do | |
1578 | not want to fiddle with the addend. Otherwise, we | |
1579 | need to include the symbol value so that it becomes | |
1580 | an addend for the dynamic reloc. */ | |
1581 | if (! relocate) | |
1582 | continue; | |
1583 | } | |
1584 | ||
1585 | break; | |
1586 | ||
1587 | default: | |
1588 | break; | |
1589 | } | |
1590 | ||
1591 | r = _bfd_final_link_relocate (howto, input_bfd, input_section, | |
1592 | contents, rel->r_offset, | |
1593 | relocation, (bfd_vma) 0); | |
1594 | ||
1595 | if (r != bfd_reloc_ok) | |
1596 | { | |
1597 | switch (r) | |
1598 | { | |
1599 | default: | |
1600 | case bfd_reloc_outofrange: | |
1601 | abort (); | |
1602 | case bfd_reloc_overflow: | |
1603 | { | |
1604 | const char *name; | |
1605 | ||
1606 | if (h != NULL) | |
1607 | name = h->root.root.string; | |
1608 | else | |
1609 | { | |
1610 | name = bfd_elf_string_from_elf_section (input_bfd, | |
1611 | symtab_hdr->sh_link, | |
1612 | sym->st_name); | |
1613 | if (name == NULL) | |
1614 | return false; | |
1615 | if (*name == '\0') | |
1616 | name = bfd_section_name (input_bfd, sec); | |
1617 | } | |
1618 | if (! ((*info->callbacks->reloc_overflow) | |
1619 | (info, name, howto->name, (bfd_vma) 0, | |
1620 | input_bfd, input_section, rel->r_offset))) | |
1621 | return false; | |
1622 | } | |
1623 | break; | |
1624 | } | |
1625 | } | |
1626 | } | |
1627 | ||
1628 | return true; | |
1629 | } | |
1630 | ||
1631 | /* Finish up dynamic symbol handling. We set the contents of various | |
1632 | dynamic sections here. */ | |
1633 | ||
1634 | static boolean | |
1635 | elf_i386_finish_dynamic_symbol (output_bfd, info, h, sym) | |
1636 | bfd *output_bfd; | |
1637 | struct bfd_link_info *info; | |
1638 | struct elf_link_hash_entry *h; | |
1639 | Elf_Internal_Sym *sym; | |
1640 | { | |
1641 | bfd *dynobj; | |
1642 | ||
1643 | dynobj = elf_hash_table (info)->dynobj; | |
1644 | ||
1645 | if (h->plt.offset != (bfd_vma) -1) | |
1646 | { | |
1647 | asection *splt; | |
1648 | asection *sgot; | |
1649 | asection *srel; | |
1650 | bfd_vma plt_index; | |
1651 | bfd_vma got_offset; | |
1652 | Elf_Internal_Rel rel; | |
1653 | ||
1654 | /* This symbol has an entry in the procedure linkage table. Set | |
1655 | it up. */ | |
1656 | ||
1657 | BFD_ASSERT (h->dynindx != -1); | |
1658 | ||
1659 | splt = bfd_get_section_by_name (dynobj, ".plt"); | |
1660 | sgot = bfd_get_section_by_name (dynobj, ".got.plt"); | |
1661 | srel = bfd_get_section_by_name (dynobj, ".rel.plt"); | |
1662 | BFD_ASSERT (splt != NULL && sgot != NULL && srel != NULL); | |
1663 | ||
1664 | /* Get the index in the procedure linkage table which | |
1665 | corresponds to this symbol. This is the index of this symbol | |
1666 | in all the symbols for which we are making plt entries. The | |
1667 | first entry in the procedure linkage table is reserved. */ | |
1668 | plt_index = h->plt.offset / PLT_ENTRY_SIZE - 1; | |
1669 | ||
1670 | /* Get the offset into the .got table of the entry that | |
1671 | corresponds to this function. Each .got entry is 4 bytes. | |
1672 | The first three are reserved. */ | |
1673 | got_offset = (plt_index + 3) * 4; | |
1674 | ||
1675 | /* Fill in the entry in the procedure linkage table. */ | |
1676 | if (! info->shared) | |
1677 | { | |
1678 | memcpy (splt->contents + h->plt.offset, elf_i386_plt_entry, | |
1679 | PLT_ENTRY_SIZE); | |
1680 | bfd_put_32 (output_bfd, | |
1681 | (sgot->output_section->vma | |
1682 | + sgot->output_offset | |
1683 | + got_offset), | |
1684 | splt->contents + h->plt.offset + 2); | |
1685 | } | |
1686 | else | |
1687 | { | |
1688 | memcpy (splt->contents + h->plt.offset, elf_i386_pic_plt_entry, | |
1689 | PLT_ENTRY_SIZE); | |
1690 | bfd_put_32 (output_bfd, got_offset, | |
1691 | splt->contents + h->plt.offset + 2); | |
1692 | } | |
1693 | ||
1694 | bfd_put_32 (output_bfd, plt_index * sizeof (Elf32_External_Rel), | |
1695 | splt->contents + h->plt.offset + 7); | |
1696 | bfd_put_32 (output_bfd, - (h->plt.offset + PLT_ENTRY_SIZE), | |
1697 | splt->contents + h->plt.offset + 12); | |
1698 | ||
1699 | /* Fill in the entry in the global offset table. */ | |
1700 | bfd_put_32 (output_bfd, | |
1701 | (splt->output_section->vma | |
1702 | + splt->output_offset | |
1703 | + h->plt.offset | |
1704 | + 6), | |
1705 | sgot->contents + got_offset); | |
1706 | ||
1707 | /* Fill in the entry in the .rel.plt section. */ | |
1708 | rel.r_offset = (sgot->output_section->vma | |
1709 | + sgot->output_offset | |
1710 | + got_offset); | |
1711 | rel.r_info = ELF32_R_INFO (h->dynindx, R_386_JUMP_SLOT); | |
1712 | bfd_elf32_swap_reloc_out (output_bfd, &rel, | |
1713 | ((Elf32_External_Rel *) srel->contents | |
1714 | + plt_index)); | |
1715 | ||
1716 | if ((h->elf_link_hash_flags & ELF_LINK_HASH_DEF_REGULAR) == 0) | |
1717 | { | |
1718 | /* Mark the symbol as undefined, rather than as defined in | |
1719 | the .plt section. Leave the value alone. */ | |
1720 | sym->st_shndx = SHN_UNDEF; | |
1721 | } | |
1722 | } | |
1723 | ||
1724 | if (h->got.offset != (bfd_vma) -1) | |
1725 | { | |
1726 | asection *sgot; | |
1727 | asection *srel; | |
1728 | Elf_Internal_Rel rel; | |
1729 | ||
1730 | /* This symbol has an entry in the global offset table. Set it | |
1731 | up. */ | |
1732 | ||
1733 | sgot = bfd_get_section_by_name (dynobj, ".got"); | |
1734 | srel = bfd_get_section_by_name (dynobj, ".rel.got"); | |
1735 | BFD_ASSERT (sgot != NULL && srel != NULL); | |
1736 | ||
1737 | rel.r_offset = (sgot->output_section->vma | |
1738 | + sgot->output_offset | |
1739 | + (h->got.offset &~ 1)); | |
1740 | ||
1741 | /* If this is a -Bsymbolic link, and the symbol is defined | |
1742 | locally, we just want to emit a RELATIVE reloc. Likewise if | |
1743 | the symbol was forced to be local because of a version file. | |
1744 | The entry in the global offset table will already have been | |
1745 | initialized in the relocate_section function. */ | |
1746 | if (info->shared | |
1747 | && (info->symbolic || h->dynindx == -1) | |
1748 | && (h->elf_link_hash_flags & ELF_LINK_HASH_DEF_REGULAR)) | |
1749 | rel.r_info = ELF32_R_INFO (0, R_386_RELATIVE); | |
1750 | else | |
1751 | { | |
1752 | bfd_put_32 (output_bfd, (bfd_vma) 0, sgot->contents + h->got.offset); | |
1753 | rel.r_info = ELF32_R_INFO (h->dynindx, R_386_GLOB_DAT); | |
1754 | } | |
1755 | ||
1756 | bfd_elf32_swap_reloc_out (output_bfd, &rel, | |
1757 | ((Elf32_External_Rel *) srel->contents | |
1758 | + srel->reloc_count)); | |
1759 | ++srel->reloc_count; | |
1760 | } | |
1761 | ||
1762 | if ((h->elf_link_hash_flags & ELF_LINK_HASH_NEEDS_COPY) != 0) | |
1763 | { | |
1764 | asection *s; | |
1765 | Elf_Internal_Rel rel; | |
1766 | ||
1767 | /* This symbol needs a copy reloc. Set it up. */ | |
1768 | ||
1769 | BFD_ASSERT (h->dynindx != -1 | |
1770 | && (h->root.type == bfd_link_hash_defined | |
1771 | || h->root.type == bfd_link_hash_defweak)); | |
1772 | ||
1773 | s = bfd_get_section_by_name (h->root.u.def.section->owner, | |
1774 | ".rel.bss"); | |
1775 | BFD_ASSERT (s != NULL); | |
1776 | ||
1777 | rel.r_offset = (h->root.u.def.value | |
1778 | + h->root.u.def.section->output_section->vma | |
1779 | + h->root.u.def.section->output_offset); | |
1780 | rel.r_info = ELF32_R_INFO (h->dynindx, R_386_COPY); | |
1781 | bfd_elf32_swap_reloc_out (output_bfd, &rel, | |
1782 | ((Elf32_External_Rel *) s->contents | |
1783 | + s->reloc_count)); | |
1784 | ++s->reloc_count; | |
1785 | } | |
1786 | ||
1787 | /* Mark _DYNAMIC and _GLOBAL_OFFSET_TABLE_ as absolute. */ | |
1788 | if (strcmp (h->root.root.string, "_DYNAMIC") == 0 | |
1789 | || strcmp (h->root.root.string, "_GLOBAL_OFFSET_TABLE_") == 0) | |
1790 | sym->st_shndx = SHN_ABS; | |
1791 | ||
1792 | return true; | |
1793 | } | |
1794 | ||
1795 | /* Finish up the dynamic sections. */ | |
1796 | ||
1797 | static boolean | |
1798 | elf_i386_finish_dynamic_sections (output_bfd, info) | |
1799 | bfd *output_bfd; | |
1800 | struct bfd_link_info *info; | |
1801 | { | |
1802 | bfd *dynobj; | |
1803 | asection *sgot; | |
1804 | asection *sdyn; | |
1805 | ||
1806 | dynobj = elf_hash_table (info)->dynobj; | |
1807 | ||
1808 | sgot = bfd_get_section_by_name (dynobj, ".got.plt"); | |
1809 | BFD_ASSERT (sgot != NULL); | |
1810 | sdyn = bfd_get_section_by_name (dynobj, ".dynamic"); | |
1811 | ||
1812 | if (elf_hash_table (info)->dynamic_sections_created) | |
1813 | { | |
1814 | asection *splt; | |
1815 | Elf32_External_Dyn *dyncon, *dynconend; | |
1816 | ||
1817 | BFD_ASSERT (sdyn != NULL); | |
1818 | ||
1819 | dyncon = (Elf32_External_Dyn *) sdyn->contents; | |
1820 | dynconend = (Elf32_External_Dyn *) (sdyn->contents + sdyn->_raw_size); | |
1821 | for (; dyncon < dynconend; dyncon++) | |
1822 | { | |
1823 | Elf_Internal_Dyn dyn; | |
1824 | const char *name; | |
1825 | asection *s; | |
1826 | ||
1827 | bfd_elf32_swap_dyn_in (dynobj, dyncon, &dyn); | |
1828 | ||
1829 | switch (dyn.d_tag) | |
1830 | { | |
1831 | default: | |
1832 | break; | |
1833 | ||
1834 | case DT_PLTGOT: | |
1835 | name = ".got"; | |
1836 | goto get_vma; | |
1837 | case DT_JMPREL: | |
1838 | name = ".rel.plt"; | |
1839 | get_vma: | |
1840 | s = bfd_get_section_by_name (output_bfd, name); | |
1841 | BFD_ASSERT (s != NULL); | |
1842 | dyn.d_un.d_ptr = s->vma; | |
1843 | bfd_elf32_swap_dyn_out (output_bfd, &dyn, dyncon); | |
1844 | break; | |
1845 | ||
1846 | case DT_PLTRELSZ: | |
1847 | s = bfd_get_section_by_name (output_bfd, ".rel.plt"); | |
1848 | BFD_ASSERT (s != NULL); | |
1849 | if (s->_cooked_size != 0) | |
1850 | dyn.d_un.d_val = s->_cooked_size; | |
1851 | else | |
1852 | dyn.d_un.d_val = s->_raw_size; | |
1853 | bfd_elf32_swap_dyn_out (output_bfd, &dyn, dyncon); | |
1854 | break; | |
1855 | ||
1856 | case DT_RELSZ: | |
1857 | /* My reading of the SVR4 ABI indicates that the | |
1858 | procedure linkage table relocs (DT_JMPREL) should be | |
1859 | included in the overall relocs (DT_REL). This is | |
1860 | what Solaris does. However, UnixWare can not handle | |
1861 | that case. Therefore, we override the DT_RELSZ entry | |
1862 | here to make it not include the JMPREL relocs. Since | |
1863 | the linker script arranges for .rel.plt to follow all | |
1864 | other relocation sections, we don't have to worry | |
1865 | about changing the DT_REL entry. */ | |
1866 | s = bfd_get_section_by_name (output_bfd, ".rel.plt"); | |
1867 | if (s != NULL) | |
1868 | { | |
1869 | if (s->_cooked_size != 0) | |
1870 | dyn.d_un.d_val -= s->_cooked_size; | |
1871 | else | |
1872 | dyn.d_un.d_val -= s->_raw_size; | |
1873 | } | |
1874 | bfd_elf32_swap_dyn_out (output_bfd, &dyn, dyncon); | |
1875 | break; | |
1876 | } | |
1877 | } | |
1878 | ||
1879 | /* Fill in the first entry in the procedure linkage table. */ | |
1880 | splt = bfd_get_section_by_name (dynobj, ".plt"); | |
1881 | if (splt && splt->_raw_size > 0) | |
1882 | { | |
1883 | if (info->shared) | |
1884 | memcpy (splt->contents, elf_i386_pic_plt0_entry, PLT_ENTRY_SIZE); | |
1885 | else | |
1886 | { | |
1887 | memcpy (splt->contents, elf_i386_plt0_entry, PLT_ENTRY_SIZE); | |
1888 | bfd_put_32 (output_bfd, | |
1889 | sgot->output_section->vma + sgot->output_offset + 4, | |
1890 | splt->contents + 2); | |
1891 | bfd_put_32 (output_bfd, | |
1892 | sgot->output_section->vma + sgot->output_offset + 8, | |
1893 | splt->contents + 8); | |
1894 | } | |
1895 | ||
1896 | /* UnixWare sets the entsize of .plt to 4, although that doesn't | |
1897 | really seem like the right value. */ | |
1898 | elf_section_data (splt->output_section)->this_hdr.sh_entsize = 4; | |
1899 | } | |
1900 | } | |
1901 | ||
1902 | /* Fill in the first three entries in the global offset table. */ | |
1903 | if (sgot->_raw_size > 0) | |
1904 | { | |
1905 | if (sdyn == NULL) | |
1906 | bfd_put_32 (output_bfd, (bfd_vma) 0, sgot->contents); | |
1907 | else | |
1908 | bfd_put_32 (output_bfd, | |
1909 | sdyn->output_section->vma + sdyn->output_offset, | |
1910 | sgot->contents); | |
1911 | bfd_put_32 (output_bfd, (bfd_vma) 0, sgot->contents + 4); | |
1912 | bfd_put_32 (output_bfd, (bfd_vma) 0, sgot->contents + 8); | |
1913 | } | |
1914 | ||
1915 | elf_section_data (sgot->output_section)->this_hdr.sh_entsize = 4; | |
1916 | ||
1917 | return true; | |
1918 | } | |
1919 | ||
1920 | #define TARGET_LITTLE_SYM bfd_elf32_i386_vec | |
1921 | #define TARGET_LITTLE_NAME "elf32-i386" | |
1922 | #define ELF_ARCH bfd_arch_i386 | |
1923 | #define ELF_MACHINE_CODE EM_386 | |
1924 | #define ELF_MAXPAGESIZE 0x1000 | |
1925 | #define elf_info_to_howto elf_i386_info_to_howto | |
1926 | #define elf_info_to_howto_rel elf_i386_info_to_howto_rel | |
1927 | #define bfd_elf32_bfd_reloc_type_lookup elf_i386_reloc_type_lookup | |
1928 | #define bfd_elf32_bfd_is_local_label_name \ | |
1929 | elf_i386_is_local_label_name | |
1930 | #define elf_backend_create_dynamic_sections \ | |
1931 | _bfd_elf_create_dynamic_sections | |
1932 | #define bfd_elf32_bfd_link_hash_table_create \ | |
1933 | elf_i386_link_hash_table_create | |
1934 | #define elf_backend_check_relocs elf_i386_check_relocs | |
1935 | #define elf_backend_adjust_dynamic_symbol \ | |
1936 | elf_i386_adjust_dynamic_symbol | |
1937 | #define elf_backend_size_dynamic_sections \ | |
1938 | elf_i386_size_dynamic_sections | |
1939 | #define elf_backend_relocate_section elf_i386_relocate_section | |
1940 | #define elf_backend_finish_dynamic_symbol \ | |
1941 | elf_i386_finish_dynamic_symbol | |
1942 | #define elf_backend_finish_dynamic_sections \ | |
1943 | elf_i386_finish_dynamic_sections | |
1944 | #define elf_backend_gc_mark_hook elf_i386_gc_mark_hook | |
1945 | #define elf_backend_gc_sweep_hook elf_i386_gc_sweep_hook | |
1946 | ||
1947 | #define elf_backend_can_gc_sections 1 | |
1948 | #define elf_backend_want_got_plt 1 | |
1949 | #define elf_backend_plt_readonly 1 | |
1950 | #define elf_backend_want_plt_sym 0 | |
1951 | #define elf_backend_got_header_size 12 | |
1952 | #define elf_backend_plt_header_size PLT_ENTRY_SIZE | |
1953 | ||
1954 | #include "elf32-target.h" |