Commit | Line | Data |
---|---|---|
252b5132 | 1 | /* Intel 80386/80486-specific support for 32-bit ELF |
7898deda | 2 | Copyright 1993, 1994, 1995, 1996, 1997, 1998, 1999, 2000, 2001 |
638632bd | 3 | Free Software Foundation, Inc. |
252b5132 RH |
4 | |
5 | This file is part of BFD, the Binary File Descriptor library. | |
6 | ||
7 | This program is free software; you can redistribute it and/or modify | |
8 | it under the terms of the GNU General Public License as published by | |
9 | the Free Software Foundation; either version 2 of the License, or | |
10 | (at your option) any later version. | |
11 | ||
12 | This program is distributed in the hope that it will be useful, | |
13 | but WITHOUT ANY WARRANTY; without even the implied warranty of | |
14 | MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the | |
15 | GNU General Public License for more details. | |
16 | ||
17 | You should have received a copy of the GNU General Public License | |
18 | along with this program; if not, write to the Free Software | |
19 | Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA. */ | |
20 | ||
21 | #include "bfd.h" | |
22 | #include "sysdep.h" | |
23 | #include "bfdlink.h" | |
24 | #include "libbfd.h" | |
25 | #include "elf-bfd.h" | |
26 | ||
27 | static reloc_howto_type *elf_i386_reloc_type_lookup | |
28 | PARAMS ((bfd *, bfd_reloc_code_real_type)); | |
29 | static void elf_i386_info_to_howto | |
30 | PARAMS ((bfd *, arelent *, Elf32_Internal_Rela *)); | |
31 | static void elf_i386_info_to_howto_rel | |
32 | PARAMS ((bfd *, arelent *, Elf32_Internal_Rel *)); | |
33 | static boolean elf_i386_is_local_label_name PARAMS ((bfd *, const char *)); | |
34 | static struct bfd_hash_entry *elf_i386_link_hash_newfunc | |
35 | PARAMS ((struct bfd_hash_entry *, struct bfd_hash_table *, const char *)); | |
36 | static struct bfd_link_hash_table *elf_i386_link_hash_table_create | |
37 | PARAMS ((bfd *)); | |
6725bdbf AM |
38 | static boolean create_got_section PARAMS((bfd *, struct bfd_link_info *)); |
39 | static boolean elf_i386_create_dynamic_sections | |
40 | PARAMS((bfd *, struct bfd_link_info *)); | |
252b5132 RH |
41 | static boolean elf_i386_check_relocs |
42 | PARAMS ((bfd *, struct bfd_link_info *, asection *, | |
43 | const Elf_Internal_Rela *)); | |
a7b97311 AM |
44 | static asection *elf_i386_gc_mark_hook |
45 | PARAMS ((bfd *, struct bfd_link_info *, Elf_Internal_Rela *, | |
46 | struct elf_link_hash_entry *, Elf_Internal_Sym *)); | |
47 | static boolean elf_i386_gc_sweep_hook | |
48 | PARAMS ((bfd *, struct bfd_link_info *, asection *, | |
49 | const Elf_Internal_Rela *)); | |
252b5132 RH |
50 | static boolean elf_i386_adjust_dynamic_symbol |
51 | PARAMS ((struct bfd_link_info *, struct elf_link_hash_entry *)); | |
12d0ee4a | 52 | static boolean allocate_plt_and_got_and_discard_relocs |
6725bdbf | 53 | PARAMS ((struct elf_link_hash_entry *, PTR)); |
252b5132 RH |
54 | static boolean elf_i386_size_dynamic_sections |
55 | PARAMS ((bfd *, struct bfd_link_info *)); | |
56 | static boolean elf_i386_relocate_section | |
57 | PARAMS ((bfd *, struct bfd_link_info *, bfd *, asection *, bfd_byte *, | |
58 | Elf_Internal_Rela *, Elf_Internal_Sym *, asection **)); | |
59 | static boolean elf_i386_finish_dynamic_symbol | |
60 | PARAMS ((bfd *, struct bfd_link_info *, struct elf_link_hash_entry *, | |
61 | Elf_Internal_Sym *)); | |
62 | static boolean elf_i386_finish_dynamic_sections | |
63 | PARAMS ((bfd *, struct bfd_link_info *)); | |
a7b97311 AM |
64 | static boolean elf_i386_fake_sections |
65 | PARAMS ((bfd *, Elf32_Internal_Shdr *, asection *)); | |
db6751f2 | 66 | static enum elf_reloc_type_class elf_i386_reloc_type_class PARAMS ((int)); |
2e67030c DJ |
67 | static boolean elf_i386_grok_prstatus |
68 | PARAMS ((bfd *abfd, Elf_Internal_Note *note)); | |
69 | static boolean elf_i386_grok_psinfo | |
70 | PARAMS ((bfd *abfd, Elf_Internal_Note *note)); | |
252b5132 RH |
71 | |
72 | #define USE_REL 1 /* 386 uses REL relocations instead of RELA */ | |
73 | ||
74 | #include "elf/i386.h" | |
75 | ||
76 | static reloc_howto_type elf_howto_table[]= | |
77 | { | |
1b452ec6 AM |
78 | HOWTO(R_386_NONE, 0, 0, 0, false, 0, complain_overflow_bitfield, |
79 | bfd_elf_generic_reloc, "R_386_NONE", | |
80 | true, 0x00000000, 0x00000000, false), | |
81 | HOWTO(R_386_32, 0, 2, 32, false, 0, complain_overflow_bitfield, | |
82 | bfd_elf_generic_reloc, "R_386_32", | |
83 | true, 0xffffffff, 0xffffffff, false), | |
84 | HOWTO(R_386_PC32, 0, 2, 32, true, 0, complain_overflow_bitfield, | |
85 | bfd_elf_generic_reloc, "R_386_PC32", | |
86 | true, 0xffffffff, 0xffffffff, true), | |
87 | HOWTO(R_386_GOT32, 0, 2, 32, false, 0, complain_overflow_bitfield, | |
88 | bfd_elf_generic_reloc, "R_386_GOT32", | |
89 | true, 0xffffffff, 0xffffffff, false), | |
90 | HOWTO(R_386_PLT32, 0, 2, 32, true, 0, complain_overflow_bitfield, | |
91 | bfd_elf_generic_reloc, "R_386_PLT32", | |
92 | true, 0xffffffff, 0xffffffff, true), | |
93 | HOWTO(R_386_COPY, 0, 2, 32, false, 0, complain_overflow_bitfield, | |
94 | bfd_elf_generic_reloc, "R_386_COPY", | |
95 | true, 0xffffffff, 0xffffffff, false), | |
96 | HOWTO(R_386_GLOB_DAT, 0, 2, 32, false, 0, complain_overflow_bitfield, | |
97 | bfd_elf_generic_reloc, "R_386_GLOB_DAT", | |
98 | true, 0xffffffff, 0xffffffff, false), | |
99 | HOWTO(R_386_JUMP_SLOT, 0, 2, 32, false, 0, complain_overflow_bitfield, | |
100 | bfd_elf_generic_reloc, "R_386_JUMP_SLOT", | |
101 | true, 0xffffffff, 0xffffffff, false), | |
102 | HOWTO(R_386_RELATIVE, 0, 2, 32, false, 0, complain_overflow_bitfield, | |
103 | bfd_elf_generic_reloc, "R_386_RELATIVE", | |
104 | true, 0xffffffff, 0xffffffff, false), | |
105 | HOWTO(R_386_GOTOFF, 0, 2, 32, false, 0, complain_overflow_bitfield, | |
106 | bfd_elf_generic_reloc, "R_386_GOTOFF", | |
107 | true, 0xffffffff, 0xffffffff, false), | |
108 | HOWTO(R_386_GOTPC, 0, 2, 32, true, 0, complain_overflow_bitfield, | |
109 | bfd_elf_generic_reloc, "R_386_GOTPC", | |
110 | true, 0xffffffff, 0xffffffff, true), | |
111 | ||
dc47f327 AM |
112 | /* We have a gap in the reloc numbers here. |
113 | R_386_standard counts the number up to this point, and | |
114 | R_386_ext_offset is the value to subtract from a reloc type of | |
115 | R_386_16 thru R_386_PC8 to form an index into this table. */ | |
1b452ec6 AM |
116 | #define R_386_standard ((unsigned int) R_386_GOTPC + 1) |
117 | #define R_386_ext_offset ((unsigned int) R_386_16 - R_386_standard) | |
118 | ||
252b5132 | 119 | /* The remaining relocs are a GNU extension. */ |
1b452ec6 AM |
120 | HOWTO(R_386_16, 0, 1, 16, false, 0, complain_overflow_bitfield, |
121 | bfd_elf_generic_reloc, "R_386_16", | |
122 | true, 0xffff, 0xffff, false), | |
123 | HOWTO(R_386_PC16, 0, 1, 16, true, 0, complain_overflow_bitfield, | |
124 | bfd_elf_generic_reloc, "R_386_PC16", | |
125 | true, 0xffff, 0xffff, true), | |
126 | HOWTO(R_386_8, 0, 0, 8, false, 0, complain_overflow_bitfield, | |
127 | bfd_elf_generic_reloc, "R_386_8", | |
128 | true, 0xff, 0xff, false), | |
129 | HOWTO(R_386_PC8, 0, 0, 8, true, 0, complain_overflow_signed, | |
130 | bfd_elf_generic_reloc, "R_386_PC8", | |
dc47f327 AM |
131 | true, 0xff, 0xff, true), |
132 | ||
133 | /* Another gap. */ | |
134 | #define R_386_ext ((unsigned int) R_386_PC8 + 1 - R_386_ext_offset) | |
135 | #define R_386_vt_offset ((unsigned int) R_386_GNU_VTINHERIT - R_386_ext) | |
252b5132 RH |
136 | |
137 | /* GNU extension to record C++ vtable hierarchy. */ | |
252b5132 RH |
138 | HOWTO (R_386_GNU_VTINHERIT, /* type */ |
139 | 0, /* rightshift */ | |
140 | 2, /* size (0 = byte, 1 = short, 2 = long) */ | |
141 | 0, /* bitsize */ | |
142 | false, /* pc_relative */ | |
143 | 0, /* bitpos */ | |
144 | complain_overflow_dont, /* complain_on_overflow */ | |
145 | NULL, /* special_function */ | |
146 | "R_386_GNU_VTINHERIT", /* name */ | |
147 | false, /* partial_inplace */ | |
148 | 0, /* src_mask */ | |
149 | 0, /* dst_mask */ | |
dc47f327 | 150 | false), |
252b5132 RH |
151 | |
152 | /* GNU extension to record C++ vtable member usage. */ | |
252b5132 RH |
153 | HOWTO (R_386_GNU_VTENTRY, /* type */ |
154 | 0, /* rightshift */ | |
155 | 2, /* size (0 = byte, 1 = short, 2 = long) */ | |
156 | 0, /* bitsize */ | |
157 | false, /* pc_relative */ | |
158 | 0, /* bitpos */ | |
159 | complain_overflow_dont, /* complain_on_overflow */ | |
160 | _bfd_elf_rel_vtable_reloc_fn, /* special_function */ | |
161 | "R_386_GNU_VTENTRY", /* name */ | |
162 | false, /* partial_inplace */ | |
163 | 0, /* src_mask */ | |
164 | 0, /* dst_mask */ | |
dc47f327 AM |
165 | false) |
166 | ||
167 | #define R_386_vt ((unsigned int) R_386_GNU_VTENTRY + 1 - R_386_vt_offset) | |
168 | ||
169 | }; | |
170 | ||
252b5132 RH |
171 | #ifdef DEBUG_GEN_RELOC |
172 | #define TRACE(str) fprintf (stderr, "i386 bfd reloc lookup %d (%s)\n", code, str) | |
173 | #else | |
174 | #define TRACE(str) | |
175 | #endif | |
176 | ||
177 | static reloc_howto_type * | |
178 | elf_i386_reloc_type_lookup (abfd, code) | |
7442e600 | 179 | bfd *abfd ATTRIBUTE_UNUSED; |
252b5132 RH |
180 | bfd_reloc_code_real_type code; |
181 | { | |
182 | switch (code) | |
183 | { | |
184 | case BFD_RELOC_NONE: | |
185 | TRACE ("BFD_RELOC_NONE"); | |
1b452ec6 | 186 | return &elf_howto_table[(unsigned int) R_386_NONE ]; |
252b5132 RH |
187 | |
188 | case BFD_RELOC_32: | |
189 | TRACE ("BFD_RELOC_32"); | |
1b452ec6 | 190 | return &elf_howto_table[(unsigned int) R_386_32 ]; |
252b5132 RH |
191 | |
192 | case BFD_RELOC_CTOR: | |
193 | TRACE ("BFD_RELOC_CTOR"); | |
1b452ec6 | 194 | return &elf_howto_table[(unsigned int) R_386_32 ]; |
252b5132 RH |
195 | |
196 | case BFD_RELOC_32_PCREL: | |
197 | TRACE ("BFD_RELOC_PC32"); | |
1b452ec6 | 198 | return &elf_howto_table[(unsigned int) R_386_PC32 ]; |
252b5132 RH |
199 | |
200 | case BFD_RELOC_386_GOT32: | |
201 | TRACE ("BFD_RELOC_386_GOT32"); | |
1b452ec6 | 202 | return &elf_howto_table[(unsigned int) R_386_GOT32 ]; |
252b5132 RH |
203 | |
204 | case BFD_RELOC_386_PLT32: | |
205 | TRACE ("BFD_RELOC_386_PLT32"); | |
1b452ec6 | 206 | return &elf_howto_table[(unsigned int) R_386_PLT32 ]; |
252b5132 RH |
207 | |
208 | case BFD_RELOC_386_COPY: | |
209 | TRACE ("BFD_RELOC_386_COPY"); | |
1b452ec6 | 210 | return &elf_howto_table[(unsigned int) R_386_COPY ]; |
252b5132 RH |
211 | |
212 | case BFD_RELOC_386_GLOB_DAT: | |
213 | TRACE ("BFD_RELOC_386_GLOB_DAT"); | |
1b452ec6 | 214 | return &elf_howto_table[(unsigned int) R_386_GLOB_DAT ]; |
252b5132 RH |
215 | |
216 | case BFD_RELOC_386_JUMP_SLOT: | |
217 | TRACE ("BFD_RELOC_386_JUMP_SLOT"); | |
1b452ec6 | 218 | return &elf_howto_table[(unsigned int) R_386_JUMP_SLOT ]; |
252b5132 RH |
219 | |
220 | case BFD_RELOC_386_RELATIVE: | |
221 | TRACE ("BFD_RELOC_386_RELATIVE"); | |
1b452ec6 | 222 | return &elf_howto_table[(unsigned int) R_386_RELATIVE ]; |
252b5132 RH |
223 | |
224 | case BFD_RELOC_386_GOTOFF: | |
225 | TRACE ("BFD_RELOC_386_GOTOFF"); | |
1b452ec6 | 226 | return &elf_howto_table[(unsigned int) R_386_GOTOFF ]; |
252b5132 RH |
227 | |
228 | case BFD_RELOC_386_GOTPC: | |
229 | TRACE ("BFD_RELOC_386_GOTPC"); | |
1b452ec6 | 230 | return &elf_howto_table[(unsigned int) R_386_GOTPC ]; |
252b5132 RH |
231 | |
232 | /* The remaining relocs are a GNU extension. */ | |
233 | case BFD_RELOC_16: | |
234 | TRACE ("BFD_RELOC_16"); | |
1b452ec6 | 235 | return &elf_howto_table[(unsigned int) R_386_16 - R_386_ext_offset]; |
252b5132 RH |
236 | |
237 | case BFD_RELOC_16_PCREL: | |
238 | TRACE ("BFD_RELOC_16_PCREL"); | |
1b452ec6 | 239 | return &elf_howto_table[(unsigned int) R_386_PC16 - R_386_ext_offset]; |
252b5132 RH |
240 | |
241 | case BFD_RELOC_8: | |
242 | TRACE ("BFD_RELOC_8"); | |
1b452ec6 | 243 | return &elf_howto_table[(unsigned int) R_386_8 - R_386_ext_offset]; |
252b5132 RH |
244 | |
245 | case BFD_RELOC_8_PCREL: | |
246 | TRACE ("BFD_RELOC_8_PCREL"); | |
1b452ec6 | 247 | return &elf_howto_table[(unsigned int) R_386_PC8 - R_386_ext_offset]; |
252b5132 RH |
248 | |
249 | case BFD_RELOC_VTABLE_INHERIT: | |
250 | TRACE ("BFD_RELOC_VTABLE_INHERIT"); | |
dc47f327 AM |
251 | return &elf_howto_table[(unsigned int) R_386_GNU_VTINHERIT |
252 | - R_386_vt_offset]; | |
252b5132 RH |
253 | |
254 | case BFD_RELOC_VTABLE_ENTRY: | |
255 | TRACE ("BFD_RELOC_VTABLE_ENTRY"); | |
dc47f327 AM |
256 | return &elf_howto_table[(unsigned int) R_386_GNU_VTENTRY |
257 | - R_386_vt_offset]; | |
252b5132 RH |
258 | |
259 | default: | |
260 | break; | |
261 | } | |
262 | ||
263 | TRACE ("Unknown"); | |
264 | return 0; | |
265 | } | |
266 | ||
267 | static void | |
268 | elf_i386_info_to_howto (abfd, cache_ptr, dst) | |
7442e600 ILT |
269 | bfd *abfd ATTRIBUTE_UNUSED; |
270 | arelent *cache_ptr ATTRIBUTE_UNUSED; | |
271 | Elf32_Internal_Rela *dst ATTRIBUTE_UNUSED; | |
252b5132 RH |
272 | { |
273 | abort (); | |
274 | } | |
275 | ||
276 | static void | |
277 | elf_i386_info_to_howto_rel (abfd, cache_ptr, dst) | |
7442e600 | 278 | bfd *abfd ATTRIBUTE_UNUSED; |
252b5132 RH |
279 | arelent *cache_ptr; |
280 | Elf32_Internal_Rel *dst; | |
281 | { | |
dc47f327 AM |
282 | unsigned int r_type = ELF32_R_TYPE (dst->r_info); |
283 | unsigned int indx; | |
284 | ||
285 | if ((indx = r_type) >= R_386_standard | |
286 | && ((indx = r_type - R_386_ext_offset) - R_386_standard | |
287 | >= R_386_ext - R_386_standard) | |
288 | && ((indx = r_type - R_386_vt_offset) - R_386_ext | |
289 | >= R_386_vt - R_386_ext)) | |
252b5132 | 290 | { |
dc47f327 AM |
291 | (*_bfd_error_handler) (_("%s: invalid relocation type %d"), |
292 | bfd_get_filename (abfd), (int) r_type); | |
293 | indx = (unsigned int) R_386_NONE; | |
252b5132 | 294 | } |
dc47f327 | 295 | cache_ptr->howto = &elf_howto_table[indx]; |
252b5132 RH |
296 | } |
297 | ||
298 | /* Return whether a symbol name implies a local label. The UnixWare | |
299 | 2.1 cc generates temporary symbols that start with .X, so we | |
300 | recognize them here. FIXME: do other SVR4 compilers also use .X?. | |
301 | If so, we should move the .X recognition into | |
302 | _bfd_elf_is_local_label_name. */ | |
303 | ||
304 | static boolean | |
305 | elf_i386_is_local_label_name (abfd, name) | |
306 | bfd *abfd; | |
307 | const char *name; | |
308 | { | |
309 | if (name[0] == '.' && name[1] == 'X') | |
310 | return true; | |
311 | ||
312 | return _bfd_elf_is_local_label_name (abfd, name); | |
313 | } | |
314 | \f | |
315 | /* Functions for the i386 ELF linker. */ | |
316 | ||
317 | /* The name of the dynamic interpreter. This is put in the .interp | |
318 | section. */ | |
319 | ||
320 | #define ELF_DYNAMIC_INTERPRETER "/usr/lib/libc.so.1" | |
321 | ||
322 | /* The size in bytes of an entry in the procedure linkage table. */ | |
323 | ||
324 | #define PLT_ENTRY_SIZE 16 | |
325 | ||
326 | /* The first entry in an absolute procedure linkage table looks like | |
327 | this. See the SVR4 ABI i386 supplement to see how this works. */ | |
328 | ||
329 | static const bfd_byte elf_i386_plt0_entry[PLT_ENTRY_SIZE] = | |
330 | { | |
331 | 0xff, 0x35, /* pushl contents of address */ | |
332 | 0, 0, 0, 0, /* replaced with address of .got + 4. */ | |
333 | 0xff, 0x25, /* jmp indirect */ | |
334 | 0, 0, 0, 0, /* replaced with address of .got + 8. */ | |
335 | 0, 0, 0, 0 /* pad out to 16 bytes. */ | |
336 | }; | |
337 | ||
338 | /* Subsequent entries in an absolute procedure linkage table look like | |
339 | this. */ | |
340 | ||
341 | static const bfd_byte elf_i386_plt_entry[PLT_ENTRY_SIZE] = | |
342 | { | |
343 | 0xff, 0x25, /* jmp indirect */ | |
344 | 0, 0, 0, 0, /* replaced with address of this symbol in .got. */ | |
345 | 0x68, /* pushl immediate */ | |
346 | 0, 0, 0, 0, /* replaced with offset into relocation table. */ | |
347 | 0xe9, /* jmp relative */ | |
348 | 0, 0, 0, 0 /* replaced with offset to start of .plt. */ | |
349 | }; | |
350 | ||
351 | /* The first entry in a PIC procedure linkage table look like this. */ | |
352 | ||
353 | static const bfd_byte elf_i386_pic_plt0_entry[PLT_ENTRY_SIZE] = | |
354 | { | |
355 | 0xff, 0xb3, 4, 0, 0, 0, /* pushl 4(%ebx) */ | |
356 | 0xff, 0xa3, 8, 0, 0, 0, /* jmp *8(%ebx) */ | |
357 | 0, 0, 0, 0 /* pad out to 16 bytes. */ | |
358 | }; | |
359 | ||
360 | /* Subsequent entries in a PIC procedure linkage table look like this. */ | |
361 | ||
362 | static const bfd_byte elf_i386_pic_plt_entry[PLT_ENTRY_SIZE] = | |
363 | { | |
364 | 0xff, 0xa3, /* jmp *offset(%ebx) */ | |
365 | 0, 0, 0, 0, /* replaced with offset of this symbol in .got. */ | |
366 | 0x68, /* pushl immediate */ | |
367 | 0, 0, 0, 0, /* replaced with offset into relocation table. */ | |
368 | 0xe9, /* jmp relative */ | |
369 | 0, 0, 0, 0 /* replaced with offset to start of .plt. */ | |
370 | }; | |
371 | ||
372 | /* The i386 linker needs to keep track of the number of relocs that it | |
ffb2e45b AM |
373 | decides to copy as dynamic relocs in check_relocs for each symbol. |
374 | This is so that it can later discard them if they are found to be | |
375 | unnecessary. We store the information in a field extending the | |
376 | regular ELF linker hash table. */ | |
252b5132 | 377 | |
ffb2e45b | 378 | struct elf_i386_dyn_relocs |
252b5132 RH |
379 | { |
380 | /* Next section. */ | |
ffb2e45b | 381 | struct elf_i386_dyn_relocs *next; |
252b5132 RH |
382 | /* A section in dynobj. */ |
383 | asection *section; | |
384 | /* Number of relocs copied in this section. */ | |
385 | bfd_size_type count; | |
386 | }; | |
387 | ||
388 | /* i386 ELF linker hash entry. */ | |
389 | ||
390 | struct elf_i386_link_hash_entry | |
391 | { | |
392 | struct elf_link_hash_entry root; | |
393 | ||
394 | /* Number of PC relative relocs copied for this symbol. */ | |
ffb2e45b | 395 | struct elf_i386_dyn_relocs *dyn_relocs; |
252b5132 RH |
396 | }; |
397 | ||
398 | /* i386 ELF linker hash table. */ | |
399 | ||
400 | struct elf_i386_link_hash_table | |
401 | { | |
402 | struct elf_link_hash_table root; | |
252b5132 | 403 | |
6725bdbf AM |
404 | /* Short-cuts to get to dynamic linker sections. */ |
405 | asection *sgot; | |
406 | asection *sgotplt; | |
407 | asection *srelgot; | |
408 | asection *splt; | |
409 | asection *srelplt; | |
410 | asection *sdynbss; | |
411 | asection *srelbss; | |
412 | }; | |
252b5132 RH |
413 | |
414 | /* Get the i386 ELF linker hash table from a link_info structure. */ | |
415 | ||
416 | #define elf_i386_hash_table(p) \ | |
417 | ((struct elf_i386_link_hash_table *) ((p)->hash)) | |
418 | ||
419 | /* Create an entry in an i386 ELF linker hash table. */ | |
420 | ||
421 | static struct bfd_hash_entry * | |
422 | elf_i386_link_hash_newfunc (entry, table, string) | |
423 | struct bfd_hash_entry *entry; | |
424 | struct bfd_hash_table *table; | |
425 | const char *string; | |
426 | { | |
427 | struct elf_i386_link_hash_entry *ret = | |
428 | (struct elf_i386_link_hash_entry *) entry; | |
429 | ||
430 | /* Allocate the structure if it has not already been allocated by a | |
431 | subclass. */ | |
432 | if (ret == (struct elf_i386_link_hash_entry *) NULL) | |
433 | ret = ((struct elf_i386_link_hash_entry *) | |
434 | bfd_hash_allocate (table, | |
435 | sizeof (struct elf_i386_link_hash_entry))); | |
436 | if (ret == (struct elf_i386_link_hash_entry *) NULL) | |
437 | return (struct bfd_hash_entry *) ret; | |
438 | ||
439 | /* Call the allocation method of the superclass. */ | |
440 | ret = ((struct elf_i386_link_hash_entry *) | |
441 | _bfd_elf_link_hash_newfunc ((struct bfd_hash_entry *) ret, | |
442 | table, string)); | |
443 | if (ret != (struct elf_i386_link_hash_entry *) NULL) | |
444 | { | |
ffb2e45b | 445 | ret->dyn_relocs = NULL; |
252b5132 RH |
446 | } |
447 | ||
448 | return (struct bfd_hash_entry *) ret; | |
449 | } | |
450 | ||
451 | /* Create an i386 ELF linker hash table. */ | |
452 | ||
453 | static struct bfd_link_hash_table * | |
454 | elf_i386_link_hash_table_create (abfd) | |
455 | bfd *abfd; | |
456 | { | |
457 | struct elf_i386_link_hash_table *ret; | |
dc810e39 | 458 | bfd_size_type amt = sizeof (struct elf_i386_link_hash_table); |
252b5132 | 459 | |
dc810e39 | 460 | ret = (struct elf_i386_link_hash_table *) bfd_alloc (abfd, amt); |
252b5132 RH |
461 | if (ret == (struct elf_i386_link_hash_table *) NULL) |
462 | return NULL; | |
463 | ||
464 | if (! _bfd_elf_link_hash_table_init (&ret->root, abfd, | |
465 | elf_i386_link_hash_newfunc)) | |
466 | { | |
467 | bfd_release (abfd, ret); | |
468 | return NULL; | |
469 | } | |
470 | ||
6725bdbf AM |
471 | ret->sgot = NULL; |
472 | ret->sgotplt = NULL; | |
473 | ret->srelgot = NULL; | |
474 | ret->splt = NULL; | |
475 | ret->srelplt = NULL; | |
476 | ret->sdynbss = NULL; | |
477 | ret->srelbss = NULL; | |
478 | ||
252b5132 RH |
479 | return &ret->root.root; |
480 | } | |
481 | ||
6725bdbf AM |
482 | /* Create .got, .gotplt, and .rel.got sections in DYNOBJ, and set up |
483 | shortcuts to them in our hash table. */ | |
484 | ||
485 | static boolean | |
486 | create_got_section (dynobj, info) | |
487 | bfd *dynobj; | |
488 | struct bfd_link_info *info; | |
489 | { | |
490 | struct elf_i386_link_hash_table *htab; | |
491 | ||
492 | if (! _bfd_elf_create_got_section (dynobj, info)) | |
493 | return false; | |
494 | ||
495 | htab = elf_i386_hash_table (info); | |
496 | htab->sgot = bfd_get_section_by_name (dynobj, ".got"); | |
497 | htab->sgotplt = bfd_get_section_by_name (dynobj, ".got.plt"); | |
498 | if (!htab->sgot || !htab->sgotplt) | |
499 | abort (); | |
500 | ||
501 | htab->srelgot = bfd_make_section (dynobj, ".rel.got"); | |
502 | if (htab->srelgot == NULL | |
503 | || ! bfd_set_section_flags (dynobj, htab->srelgot, | |
504 | (SEC_ALLOC | SEC_LOAD | SEC_HAS_CONTENTS | |
505 | | SEC_IN_MEMORY | SEC_LINKER_CREATED | |
506 | | SEC_READONLY)) | |
507 | || ! bfd_set_section_alignment (dynobj, htab->srelgot, 2)) | |
508 | return false; | |
509 | return true; | |
510 | } | |
511 | ||
512 | /* Create .plt, .rel.plt, .got, .got.plt, .rel.got, .dynbss, and | |
513 | .rel.bss sections in DYNOBJ, and set up shortcuts to them in our | |
514 | hash table. */ | |
515 | ||
516 | static boolean | |
517 | elf_i386_create_dynamic_sections (dynobj, info) | |
518 | bfd *dynobj; | |
519 | struct bfd_link_info *info; | |
520 | { | |
521 | struct elf_i386_link_hash_table *htab; | |
522 | ||
523 | htab = elf_i386_hash_table (info); | |
524 | if (!htab->sgot && !create_got_section (dynobj, info)) | |
525 | return false; | |
526 | ||
527 | if (!_bfd_elf_create_dynamic_sections (dynobj, info)) | |
528 | return false; | |
529 | ||
530 | htab->splt = bfd_get_section_by_name (dynobj, ".plt"); | |
531 | htab->srelplt = bfd_get_section_by_name (dynobj, ".rel.plt"); | |
532 | htab->sdynbss = bfd_get_section_by_name (dynobj, ".dynbss"); | |
533 | if (!info->shared) | |
534 | htab->srelbss = bfd_get_section_by_name (dynobj, ".rel.bss"); | |
535 | ||
536 | if (!htab->splt || !htab->srelplt || !htab->sdynbss | |
537 | || (!info->shared && !htab->srelbss)) | |
538 | abort (); | |
539 | ||
540 | return true; | |
541 | } | |
542 | ||
252b5132 RH |
543 | /* Look through the relocs for a section during the first phase, and |
544 | allocate space in the global offset table or procedure linkage | |
545 | table. */ | |
546 | ||
547 | static boolean | |
548 | elf_i386_check_relocs (abfd, info, sec, relocs) | |
549 | bfd *abfd; | |
550 | struct bfd_link_info *info; | |
551 | asection *sec; | |
552 | const Elf_Internal_Rela *relocs; | |
553 | { | |
6725bdbf | 554 | struct elf_i386_link_hash_table *htab; |
252b5132 RH |
555 | bfd *dynobj; |
556 | Elf_Internal_Shdr *symtab_hdr; | |
557 | struct elf_link_hash_entry **sym_hashes; | |
dd5724d5 | 558 | bfd_signed_vma *local_got_refcounts; |
252b5132 RH |
559 | const Elf_Internal_Rela *rel; |
560 | const Elf_Internal_Rela *rel_end; | |
252b5132 RH |
561 | asection *sreloc; |
562 | ||
563 | if (info->relocateable) | |
564 | return true; | |
565 | ||
6725bdbf AM |
566 | htab = elf_i386_hash_table (info); |
567 | dynobj = htab->root.dynobj; | |
252b5132 RH |
568 | symtab_hdr = &elf_tdata (abfd)->symtab_hdr; |
569 | sym_hashes = elf_sym_hashes (abfd); | |
dd5724d5 | 570 | local_got_refcounts = elf_local_got_refcounts (abfd); |
252b5132 | 571 | |
252b5132 RH |
572 | sreloc = NULL; |
573 | ||
574 | rel_end = relocs + sec->reloc_count; | |
575 | for (rel = relocs; rel < rel_end; rel++) | |
576 | { | |
577 | unsigned long r_symndx; | |
578 | struct elf_link_hash_entry *h; | |
579 | ||
580 | r_symndx = ELF32_R_SYM (rel->r_info); | |
581 | ||
d9bc7a44 | 582 | if (r_symndx >= NUM_SHDR_ENTRIES (symtab_hdr)) |
f5f31454 L |
583 | { |
584 | if (abfd->my_archive) | |
585 | (*_bfd_error_handler) (_("%s(%s): bad symbol index: %d"), | |
586 | bfd_get_filename (abfd->my_archive), | |
587 | bfd_get_filename (abfd), | |
588 | r_symndx); | |
589 | else | |
590 | (*_bfd_error_handler) (_("%s: bad symbol index: %d"), | |
591 | bfd_get_filename (abfd), | |
592 | r_symndx); | |
593 | return false; | |
594 | } | |
595 | ||
252b5132 RH |
596 | if (r_symndx < symtab_hdr->sh_info) |
597 | h = NULL; | |
598 | else | |
599 | h = sym_hashes[r_symndx - symtab_hdr->sh_info]; | |
600 | ||
601 | /* Some relocs require a global offset table. */ | |
12d0ee4a | 602 | if (htab->sgot == NULL) |
252b5132 RH |
603 | { |
604 | switch (ELF32_R_TYPE (rel->r_info)) | |
605 | { | |
606 | case R_386_GOT32: | |
607 | case R_386_GOTOFF: | |
608 | case R_386_GOTPC: | |
12d0ee4a AM |
609 | if (dynobj == NULL) |
610 | htab->root.dynobj = dynobj = abfd; | |
6725bdbf | 611 | if (!create_got_section (dynobj, info)) |
252b5132 RH |
612 | return false; |
613 | break; | |
614 | ||
615 | default: | |
616 | break; | |
617 | } | |
618 | } | |
619 | ||
620 | switch (ELF32_R_TYPE (rel->r_info)) | |
621 | { | |
622 | case R_386_GOT32: | |
623 | /* This symbol requires a global offset table entry. */ | |
252b5132 RH |
624 | if (h != NULL) |
625 | { | |
dd5724d5 | 626 | if (h->got.refcount == -1) |
5a15f56f | 627 | h->got.refcount = 1; |
dd5724d5 AM |
628 | else |
629 | h->got.refcount += 1; | |
252b5132 RH |
630 | } |
631 | else | |
632 | { | |
83be169b | 633 | /* This is a global offset table entry for a local symbol. */ |
dd5724d5 | 634 | if (local_got_refcounts == NULL) |
252b5132 | 635 | { |
dc810e39 | 636 | bfd_size_type size; |
252b5132 | 637 | |
dc810e39 AM |
638 | size = symtab_hdr->sh_info; |
639 | size *= sizeof (bfd_signed_vma); | |
dd5724d5 AM |
640 | local_got_refcounts = ((bfd_signed_vma *) |
641 | bfd_alloc (abfd, size)); | |
642 | if (local_got_refcounts == NULL) | |
252b5132 | 643 | return false; |
dd5724d5 | 644 | elf_local_got_refcounts (abfd) = local_got_refcounts; |
dc810e39 | 645 | memset (local_got_refcounts, -1, (size_t) size); |
252b5132 | 646 | } |
dd5724d5 | 647 | if (local_got_refcounts[r_symndx] == -1) |
6725bdbf | 648 | local_got_refcounts[r_symndx] = 1; |
dd5724d5 AM |
649 | else |
650 | local_got_refcounts[r_symndx] += 1; | |
252b5132 | 651 | } |
252b5132 RH |
652 | break; |
653 | ||
654 | case R_386_PLT32: | |
655 | /* This symbol requires a procedure linkage table entry. We | |
83be169b AM |
656 | actually build the entry in adjust_dynamic_symbol, |
657 | because this might be a case of linking PIC code which is | |
658 | never referenced by a dynamic object, in which case we | |
659 | don't need to generate a procedure linkage table entry | |
660 | after all. */ | |
252b5132 RH |
661 | |
662 | /* If this is a local symbol, we resolve it directly without | |
83be169b | 663 | creating a procedure linkage table entry. */ |
252b5132 RH |
664 | if (h == NULL) |
665 | continue; | |
666 | ||
dd5724d5 AM |
667 | if (h->plt.refcount == -1) |
668 | { | |
dd5724d5 | 669 | h->elf_link_hash_flags |= ELF_LINK_HASH_NEEDS_PLT; |
6725bdbf | 670 | h->plt.refcount = 1; |
dd5724d5 AM |
671 | } |
672 | else | |
673 | h->plt.refcount += 1; | |
252b5132 RH |
674 | break; |
675 | ||
676 | case R_386_32: | |
677 | case R_386_PC32: | |
12d0ee4a | 678 | if (h != NULL && !info->shared) |
6725bdbf | 679 | { |
12d0ee4a AM |
680 | /* If this reloc is in a read-only section, we might |
681 | need a copy reloc. */ | |
682 | if ((sec->flags & SEC_READONLY) != 0) | |
683 | h->elf_link_hash_flags |= ELF_LINK_NON_GOT_REF; | |
684 | ||
685 | /* We may need a .plt entry if the function this reloc | |
686 | refers to is in a shared lib. */ | |
687 | if (h->plt.refcount == -1) | |
688 | h->plt.refcount = 1; | |
689 | else | |
690 | h->plt.refcount += 1; | |
6725bdbf | 691 | } |
7843f00e | 692 | |
252b5132 | 693 | /* If we are creating a shared library, and this is a reloc |
f69da49f AM |
694 | against a global symbol, or a non PC relative reloc |
695 | against a local symbol, then we need to copy the reloc | |
696 | into the shared library. However, if we are linking with | |
697 | -Bsymbolic, we do not need to copy a reloc against a | |
698 | global symbol which is defined in an object we are | |
699 | including in the link (i.e., DEF_REGULAR is set). At | |
700 | this point we have not seen all the input files, so it is | |
701 | possible that DEF_REGULAR is not set now but will be set | |
1f655a09 L |
702 | later (it is never cleared). In case of a weak definition, |
703 | DEF_REGULAR may be cleared later by a strong definition in | |
704 | a shared library. We account for that possibility below by | |
705 | storing information in the relocs_copied field of the hash | |
706 | table entry. A similar situation occurs when creating | |
707 | shared libraries and symbol visibility changes render the | |
12d0ee4a | 708 | symbol local. |
56882138 | 709 | |
12d0ee4a AM |
710 | If on the other hand, we are creating an executable, we |
711 | may need to keep relocations for symbols satisfied by a | |
712 | dynamic library if we manage to avoid copy relocs for the | |
713 | symbol. */ | |
714 | if ((info->shared | |
715 | && (sec->flags & SEC_ALLOC) != 0 | |
716 | && (ELF32_R_TYPE (rel->r_info) != R_386_PC32 | |
717 | || (h != NULL | |
718 | && (! info->symbolic | |
719 | || h->root.type == bfd_link_hash_defweak | |
720 | || (h->elf_link_hash_flags | |
721 | & ELF_LINK_HASH_DEF_REGULAR) == 0)))) | |
722 | || (!info->shared | |
723 | && (sec->flags & SEC_ALLOC) != 0 | |
724 | && h != NULL | |
725 | && (h->elf_link_hash_flags & ELF_LINK_NON_GOT_REF) == 0 | |
726 | && (h->root.type == bfd_link_hash_defweak | |
727 | || (h->elf_link_hash_flags | |
728 | & ELF_LINK_HASH_DEF_REGULAR) == 0))) | |
252b5132 | 729 | { |
12d0ee4a AM |
730 | /* We must copy these reloc types into the output file. |
731 | Create a reloc section in dynobj and make room for | |
732 | this reloc. */ | |
733 | if (dynobj == NULL) | |
734 | htab->root.dynobj = dynobj = abfd; | |
28d0b90e | 735 | |
252b5132 RH |
736 | if (sreloc == NULL) |
737 | { | |
738 | const char *name; | |
739 | ||
740 | name = (bfd_elf_string_from_elf_section | |
741 | (abfd, | |
742 | elf_elfheader (abfd)->e_shstrndx, | |
743 | elf_section_data (sec)->rel_hdr.sh_name)); | |
744 | if (name == NULL) | |
745 | return false; | |
746 | ||
c8492176 L |
747 | if (strncmp (name, ".rel", 4) != 0 |
748 | || strcmp (bfd_get_section_name (abfd, sec), | |
749 | name + 4) != 0) | |
750 | { | |
751 | if (abfd->my_archive) | |
752 | (*_bfd_error_handler) (_("%s(%s): bad relocation section name `%s\'"), | |
753 | bfd_get_filename (abfd->my_archive), | |
754 | bfd_get_filename (abfd), | |
755 | name); | |
756 | else | |
757 | (*_bfd_error_handler) (_("%s: bad relocation section name `%s\'"), | |
758 | bfd_get_filename (abfd), | |
759 | name); | |
f5f31454 | 760 | } |
252b5132 RH |
761 | |
762 | sreloc = bfd_get_section_by_name (dynobj, name); | |
763 | if (sreloc == NULL) | |
764 | { | |
765 | flagword flags; | |
766 | ||
767 | sreloc = bfd_make_section (dynobj, name); | |
768 | flags = (SEC_HAS_CONTENTS | SEC_READONLY | |
769 | | SEC_IN_MEMORY | SEC_LINKER_CREATED); | |
770 | if ((sec->flags & SEC_ALLOC) != 0) | |
771 | flags |= SEC_ALLOC | SEC_LOAD; | |
772 | if (sreloc == NULL | |
773 | || ! bfd_set_section_flags (dynobj, sreloc, flags) | |
774 | || ! bfd_set_section_alignment (dynobj, sreloc, 2)) | |
775 | return false; | |
776 | } | |
db6751f2 JJ |
777 | if (sec->flags & SEC_READONLY) |
778 | info->flags |= DF_TEXTREL; | |
252b5132 RH |
779 | } |
780 | ||
781 | sreloc->_raw_size += sizeof (Elf32_External_Rel); | |
782 | ||
f69da49f AM |
783 | /* If this is a global symbol, we count the number of PC |
784 | relative relocations we have entered for this symbol, | |
785 | so that we can discard them later as necessary. Note | |
786 | that this function is only called if we are using an | |
787 | elf_i386 linker hash table, which means that h is | |
788 | really a pointer to an elf_i386_link_hash_entry. */ | |
12d0ee4a AM |
789 | if (!info->shared |
790 | || (h != NULL | |
791 | && ELF32_R_TYPE (rel->r_info) == R_386_PC32)) | |
252b5132 RH |
792 | { |
793 | struct elf_i386_link_hash_entry *eh; | |
ffb2e45b | 794 | struct elf_i386_dyn_relocs *p; |
252b5132 RH |
795 | |
796 | eh = (struct elf_i386_link_hash_entry *) h; | |
797 | ||
ffb2e45b | 798 | for (p = eh->dyn_relocs; p != NULL; p = p->next) |
252b5132 RH |
799 | if (p->section == sreloc) |
800 | break; | |
801 | ||
802 | if (p == NULL) | |
803 | { | |
ffb2e45b | 804 | p = ((struct elf_i386_dyn_relocs *) |
dc810e39 | 805 | bfd_alloc (dynobj, (bfd_size_type) sizeof *p)); |
252b5132 RH |
806 | if (p == NULL) |
807 | return false; | |
ffb2e45b AM |
808 | p->next = eh->dyn_relocs; |
809 | eh->dyn_relocs = p; | |
252b5132 RH |
810 | p->section = sreloc; |
811 | p->count = 0; | |
812 | } | |
813 | ||
814 | ++p->count; | |
815 | } | |
816 | } | |
817 | ||
818 | break; | |
819 | ||
820 | /* This relocation describes the C++ object vtable hierarchy. | |
821 | Reconstruct it for later use during GC. */ | |
822 | case R_386_GNU_VTINHERIT: | |
823 | if (!_bfd_elf32_gc_record_vtinherit (abfd, sec, h, rel->r_offset)) | |
824 | return false; | |
825 | break; | |
826 | ||
827 | /* This relocation describes which C++ vtable entries are actually | |
828 | used. Record for later use during GC. */ | |
829 | case R_386_GNU_VTENTRY: | |
830 | if (!_bfd_elf32_gc_record_vtentry (abfd, sec, h, rel->r_offset)) | |
831 | return false; | |
832 | break; | |
833 | ||
834 | default: | |
835 | break; | |
836 | } | |
837 | } | |
838 | ||
839 | return true; | |
840 | } | |
841 | ||
842 | /* Return the section that should be marked against GC for a given | |
843 | relocation. */ | |
844 | ||
845 | static asection * | |
846 | elf_i386_gc_mark_hook (abfd, info, rel, h, sym) | |
847 | bfd *abfd; | |
7442e600 | 848 | struct bfd_link_info *info ATTRIBUTE_UNUSED; |
252b5132 RH |
849 | Elf_Internal_Rela *rel; |
850 | struct elf_link_hash_entry *h; | |
851 | Elf_Internal_Sym *sym; | |
852 | { | |
853 | if (h != NULL) | |
854 | { | |
855 | switch (ELF32_R_TYPE (rel->r_info)) | |
856 | { | |
857 | case R_386_GNU_VTINHERIT: | |
858 | case R_386_GNU_VTENTRY: | |
859 | break; | |
860 | ||
861 | default: | |
862 | switch (h->root.type) | |
863 | { | |
864 | case bfd_link_hash_defined: | |
865 | case bfd_link_hash_defweak: | |
866 | return h->root.u.def.section; | |
867 | ||
868 | case bfd_link_hash_common: | |
869 | return h->root.u.c.p->section; | |
870 | ||
871 | default: | |
872 | break; | |
873 | } | |
874 | } | |
875 | } | |
876 | else | |
877 | { | |
878 | if (!(elf_bad_symtab (abfd) | |
879 | && ELF_ST_BIND (sym->st_info) != STB_LOCAL) | |
880 | && ! ((sym->st_shndx <= 0 || sym->st_shndx >= SHN_LORESERVE) | |
881 | && sym->st_shndx != SHN_COMMON)) | |
882 | { | |
883 | return bfd_section_from_elf_index (abfd, sym->st_shndx); | |
884 | } | |
885 | } | |
886 | ||
887 | return NULL; | |
888 | } | |
889 | ||
890 | /* Update the got entry reference counts for the section being removed. */ | |
891 | ||
892 | static boolean | |
893 | elf_i386_gc_sweep_hook (abfd, info, sec, relocs) | |
dd5724d5 | 894 | bfd *abfd; |
6725bdbf | 895 | struct bfd_link_info *info; |
dd5724d5 AM |
896 | asection *sec; |
897 | const Elf_Internal_Rela *relocs; | |
252b5132 | 898 | { |
dd5724d5 AM |
899 | Elf_Internal_Shdr *symtab_hdr; |
900 | struct elf_link_hash_entry **sym_hashes; | |
901 | bfd_signed_vma *local_got_refcounts; | |
902 | const Elf_Internal_Rela *rel, *relend; | |
903 | unsigned long r_symndx; | |
904 | struct elf_link_hash_entry *h; | |
905 | bfd *dynobj; | |
dd5724d5 AM |
906 | |
907 | dynobj = elf_hash_table (info)->dynobj; | |
908 | if (dynobj == NULL) | |
909 | return true; | |
910 | ||
6725bdbf AM |
911 | symtab_hdr = &elf_tdata (abfd)->symtab_hdr; |
912 | sym_hashes = elf_sym_hashes (abfd); | |
913 | local_got_refcounts = elf_local_got_refcounts (abfd); | |
dd5724d5 AM |
914 | |
915 | relend = relocs + sec->reloc_count; | |
916 | for (rel = relocs; rel < relend; rel++) | |
917 | switch (ELF32_R_TYPE (rel->r_info)) | |
918 | { | |
919 | case R_386_GOT32: | |
920 | case R_386_GOTOFF: | |
921 | case R_386_GOTPC: | |
922 | r_symndx = ELF32_R_SYM (rel->r_info); | |
923 | if (r_symndx >= symtab_hdr->sh_info) | |
924 | { | |
925 | h = sym_hashes[r_symndx - symtab_hdr->sh_info]; | |
926 | if (h->got.refcount > 0) | |
6725bdbf | 927 | h->got.refcount -= 1; |
dd5724d5 AM |
928 | } |
929 | else if (local_got_refcounts != NULL) | |
930 | { | |
931 | if (local_got_refcounts[r_symndx] > 0) | |
6725bdbf | 932 | local_got_refcounts[r_symndx] -= 1; |
dd5724d5 AM |
933 | } |
934 | break; | |
935 | ||
6725bdbf AM |
936 | case R_386_32: |
937 | case R_386_PC32: | |
938 | if (info->shared) | |
939 | break; | |
940 | /* Fall through. */ | |
941 | ||
dd5724d5 AM |
942 | case R_386_PLT32: |
943 | r_symndx = ELF32_R_SYM (rel->r_info); | |
944 | if (r_symndx >= symtab_hdr->sh_info) | |
945 | { | |
946 | h = sym_hashes[r_symndx - symtab_hdr->sh_info]; | |
947 | if (h->plt.refcount > 0) | |
948 | h->plt.refcount -= 1; | |
949 | } | |
950 | break; | |
951 | ||
952 | default: | |
953 | break; | |
954 | } | |
252b5132 RH |
955 | |
956 | return true; | |
957 | } | |
958 | ||
959 | /* Adjust a symbol defined by a dynamic object and referenced by a | |
960 | regular object. The current definition is in some section of the | |
961 | dynamic object, but we're not including those sections. We have to | |
962 | change the definition to something the rest of the link can | |
963 | understand. */ | |
964 | ||
965 | static boolean | |
966 | elf_i386_adjust_dynamic_symbol (info, h) | |
967 | struct bfd_link_info *info; | |
968 | struct elf_link_hash_entry *h; | |
969 | { | |
6725bdbf | 970 | struct elf_i386_link_hash_table *htab; |
252b5132 RH |
971 | bfd *dynobj; |
972 | asection *s; | |
973 | unsigned int power_of_two; | |
974 | ||
6725bdbf AM |
975 | htab = elf_i386_hash_table (info); |
976 | dynobj = htab->root.dynobj; | |
252b5132 | 977 | |
252b5132 RH |
978 | /* If this is a function, put it in the procedure linkage table. We |
979 | will fill in the contents of the procedure linkage table later, | |
980 | when we know the address of the .got section. */ | |
981 | if (h->type == STT_FUNC | |
982 | || (h->elf_link_hash_flags & ELF_LINK_HASH_NEEDS_PLT) != 0) | |
983 | { | |
6725bdbf AM |
984 | if (h->plt.refcount <= 0 |
985 | || (! info->shared | |
986 | && (h->elf_link_hash_flags & ELF_LINK_HASH_DEF_DYNAMIC) == 0 | |
987 | && (h->elf_link_hash_flags & ELF_LINK_HASH_REF_DYNAMIC) == 0)) | |
252b5132 RH |
988 | { |
989 | /* This case can occur if we saw a PLT32 reloc in an input | |
dd5724d5 AM |
990 | file, but the symbol was never referred to by a dynamic |
991 | object, or if all references were garbage collected. In | |
992 | such a case, we don't actually need to build a procedure | |
993 | linkage table, and we can just do a PC32 reloc instead. */ | |
6725bdbf | 994 | h->plt.refcount = (bfd_vma) -1; |
dd5724d5 | 995 | h->elf_link_hash_flags &= ~ELF_LINK_HASH_NEEDS_PLT; |
252b5132 RH |
996 | } |
997 | ||
252b5132 RH |
998 | return true; |
999 | } | |
6725bdbf AM |
1000 | else |
1001 | /* It's possible that we incorrectly decided a .plt reloc was | |
1002 | needed for an R_386_PC32 reloc to a non-function sym in | |
1003 | check_relocs. We can't decide accurately between function and | |
1004 | non-function syms in check-relocs; Objects loaded later in | |
1005 | the link may change h->type. So fix it now. */ | |
1006 | h->plt.refcount = (bfd_vma) -1; | |
252b5132 RH |
1007 | |
1008 | /* If this is a weak symbol, and there is a real definition, the | |
1009 | processor independent code will have arranged for us to see the | |
1010 | real definition first, and we can just use the same value. */ | |
1011 | if (h->weakdef != NULL) | |
1012 | { | |
1013 | BFD_ASSERT (h->weakdef->root.type == bfd_link_hash_defined | |
1014 | || h->weakdef->root.type == bfd_link_hash_defweak); | |
1015 | h->root.u.def.section = h->weakdef->root.u.def.section; | |
1016 | h->root.u.def.value = h->weakdef->root.u.def.value; | |
1017 | return true; | |
1018 | } | |
1019 | ||
1020 | /* This is a reference to a symbol defined by a dynamic object which | |
1021 | is not a function. */ | |
1022 | ||
1023 | /* If we are creating a shared library, we must presume that the | |
1024 | only references to the symbol are via the global offset table. | |
1025 | For such cases we need not do anything here; the relocations will | |
1026 | be handled correctly by relocate_section. */ | |
1027 | if (info->shared) | |
1028 | return true; | |
1029 | ||
7843f00e ILT |
1030 | /* If there are no references to this symbol that do not use the |
1031 | GOT, we don't need to generate a copy reloc. */ | |
1032 | if ((h->elf_link_hash_flags & ELF_LINK_NON_GOT_REF) == 0) | |
1033 | return true; | |
1034 | ||
252b5132 RH |
1035 | /* We must allocate the symbol in our .dynbss section, which will |
1036 | become part of the .bss section of the executable. There will be | |
1037 | an entry for this symbol in the .dynsym section. The dynamic | |
1038 | object will contain position independent code, so all references | |
1039 | from the dynamic object to this symbol will go through the global | |
1040 | offset table. The dynamic linker will use the .dynsym entry to | |
1041 | determine the address it must put in the global offset table, so | |
1042 | both the dynamic object and the regular object will refer to the | |
1043 | same memory location for the variable. */ | |
1044 | ||
6725bdbf | 1045 | s = htab->sdynbss; |
ffb2e45b AM |
1046 | if (s == NULL) |
1047 | abort (); | |
252b5132 RH |
1048 | |
1049 | /* We must generate a R_386_COPY reloc to tell the dynamic linker to | |
1050 | copy the initial value out of the dynamic object and into the | |
1051 | runtime process image. We need to remember the offset into the | |
1052 | .rel.bss section we are going to use. */ | |
1053 | if ((h->root.u.def.section->flags & SEC_ALLOC) != 0) | |
1054 | { | |
1055 | asection *srel; | |
1056 | ||
6725bdbf | 1057 | srel = htab->srelbss; |
ffb2e45b AM |
1058 | if (srel == NULL) |
1059 | abort (); | |
252b5132 RH |
1060 | srel->_raw_size += sizeof (Elf32_External_Rel); |
1061 | h->elf_link_hash_flags |= ELF_LINK_HASH_NEEDS_COPY; | |
1062 | } | |
1063 | ||
1064 | /* We need to figure out the alignment required for this symbol. I | |
1065 | have no idea how ELF linkers handle this. */ | |
1066 | power_of_two = bfd_log2 (h->size); | |
1067 | if (power_of_two > 3) | |
1068 | power_of_two = 3; | |
1069 | ||
1070 | /* Apply the required alignment. */ | |
1071 | s->_raw_size = BFD_ALIGN (s->_raw_size, | |
1072 | (bfd_size_type) (1 << power_of_two)); | |
1073 | if (power_of_two > bfd_get_section_alignment (dynobj, s)) | |
1074 | { | |
1075 | if (! bfd_set_section_alignment (dynobj, s, power_of_two)) | |
1076 | return false; | |
1077 | } | |
1078 | ||
1079 | /* Define the symbol as being at this point in the section. */ | |
1080 | h->root.u.def.section = s; | |
1081 | h->root.u.def.value = s->_raw_size; | |
1082 | ||
1083 | /* Increment the section size to make room for the symbol. */ | |
1084 | s->_raw_size += h->size; | |
1085 | ||
1086 | return true; | |
1087 | } | |
1088 | ||
6725bdbf AM |
1089 | /* This is the condition under which elf_i386_finish_dynamic_symbol |
1090 | will be called from elflink.h. If elflink.h doesn't call our | |
1091 | finish_dynamic_symbol routine, we'll need to do something about | |
1092 | initializing any .plt and .got entries in elf_i386_relocate_section. */ | |
1093 | #define WILL_CALL_FINISH_DYNAMIC_SYMBOL(DYN, INFO, H) \ | |
1094 | ((DYN) \ | |
1095 | && ((INFO)->shared \ | |
1096 | || ((H)->elf_link_hash_flags & ELF_LINK_FORCED_LOCAL) == 0) \ | |
1097 | && ((H)->dynindx != -1 \ | |
1098 | || ((H)->elf_link_hash_flags & ELF_LINK_FORCED_LOCAL) != 0)) | |
1099 | ||
1100 | /* Allocate space in .plt, .got and associated reloc sections for | |
12d0ee4a AM |
1101 | global syms. Also discards space allocated for relocs in the |
1102 | check_relocs function that we subsequently have found to be | |
1103 | unneeded. */ | |
6725bdbf AM |
1104 | |
1105 | static boolean | |
12d0ee4a | 1106 | allocate_plt_and_got_and_discard_relocs (h, inf) |
6725bdbf AM |
1107 | struct elf_link_hash_entry *h; |
1108 | PTR inf; | |
1109 | { | |
1110 | struct bfd_link_info *info; | |
1111 | struct elf_i386_link_hash_table *htab; | |
1112 | asection *s; | |
5a15f56f | 1113 | struct elf_i386_link_hash_entry *eh; |
6725bdbf AM |
1114 | |
1115 | if (h->root.type == bfd_link_hash_indirect | |
1116 | || h->root.type == bfd_link_hash_warning) | |
1117 | return true; | |
1118 | ||
1119 | info = (struct bfd_link_info *) inf; | |
1120 | htab = elf_i386_hash_table (info); | |
1121 | ||
1122 | if (htab->root.dynamic_sections_created | |
1123 | && h->plt.refcount > 0) | |
1124 | { | |
5a15f56f AM |
1125 | /* Make sure this symbol is output as a dynamic symbol. |
1126 | Undefined weak syms won't yet be marked as dynamic. */ | |
1127 | if (h->dynindx == -1 | |
1128 | && (h->elf_link_hash_flags & ELF_LINK_FORCED_LOCAL) == 0) | |
1129 | { | |
1130 | if (! bfd_elf32_link_record_dynamic_symbol (info, h)) | |
1131 | return false; | |
1132 | } | |
1133 | ||
6725bdbf | 1134 | s = htab->splt; |
ffb2e45b AM |
1135 | if (s == NULL) |
1136 | abort (); | |
6725bdbf AM |
1137 | |
1138 | /* If this is the first .plt entry, make room for the special | |
1139 | first entry. */ | |
1140 | if (s->_raw_size == 0) | |
1141 | s->_raw_size += PLT_ENTRY_SIZE; | |
1142 | ||
1143 | h->plt.offset = s->_raw_size; | |
1144 | ||
1145 | /* If this symbol is not defined in a regular file, and we are | |
1146 | not generating a shared library, then set the symbol to this | |
1147 | location in the .plt. This is required to make function | |
1148 | pointers compare as equal between the normal executable and | |
1149 | the shared library. */ | |
1150 | if (! info->shared | |
1151 | && (h->elf_link_hash_flags & ELF_LINK_HASH_DEF_REGULAR) == 0) | |
1152 | { | |
1153 | h->root.u.def.section = s; | |
1154 | h->root.u.def.value = h->plt.offset; | |
1155 | } | |
1156 | ||
1157 | /* Make room for this entry. */ | |
1158 | s->_raw_size += PLT_ENTRY_SIZE; | |
1159 | ||
1160 | /* We also need to make an entry in the .got.plt section, which | |
1161 | will be placed in the .got section by the linker script. */ | |
1162 | s = htab->sgotplt; | |
ffb2e45b AM |
1163 | if (s == NULL) |
1164 | abort (); | |
6725bdbf AM |
1165 | s->_raw_size += 4; |
1166 | ||
1167 | if (WILL_CALL_FINISH_DYNAMIC_SYMBOL (1, info, h)) | |
1168 | { | |
1169 | /* We also need to make an entry in the .rel.plt section. */ | |
1170 | s = htab->srelplt; | |
ffb2e45b AM |
1171 | if (s == NULL) |
1172 | abort (); | |
6725bdbf AM |
1173 | s->_raw_size += sizeof (Elf32_External_Rel); |
1174 | } | |
1175 | } | |
1176 | else | |
1177 | { | |
1178 | h->plt.offset = (bfd_vma) -1; | |
1179 | h->elf_link_hash_flags &= ~ELF_LINK_HASH_NEEDS_PLT; | |
1180 | } | |
1181 | ||
1182 | if (h->got.refcount > 0) | |
1183 | { | |
1184 | boolean dyn; | |
1185 | ||
5a15f56f AM |
1186 | /* Make sure this symbol is output as a dynamic symbol. |
1187 | Undefined weak syms won't yet be marked as dynamic. */ | |
1188 | if (h->dynindx == -1 | |
1189 | && (h->elf_link_hash_flags & ELF_LINK_FORCED_LOCAL) == 0) | |
1190 | { | |
1191 | if (! bfd_elf32_link_record_dynamic_symbol (info, h)) | |
1192 | return false; | |
1193 | } | |
1194 | ||
6725bdbf AM |
1195 | s = htab->sgot; |
1196 | h->got.offset = s->_raw_size; | |
1197 | s->_raw_size += 4; | |
1198 | dyn = htab->root.dynamic_sections_created; | |
1199 | if (WILL_CALL_FINISH_DYNAMIC_SYMBOL (dyn, info, h)) | |
1200 | htab->srelgot->_raw_size += sizeof (Elf32_External_Rel); | |
1201 | } | |
1202 | else | |
1203 | h->got.offset = (bfd_vma) -1; | |
1204 | ||
5a15f56f AM |
1205 | /* In the shared -Bsymbolic case, discard space allocated for |
1206 | dynamic relocs against symbols which turn out to be defined | |
12d0ee4a AM |
1207 | in regular objects. For the normal shared case, discard space |
1208 | for relocs that have become local due to symbol visibility | |
1209 | changes. For the non-shared case, discard space for symbols | |
1210 | which turn out to need copy relocs or are not dynamic. */ | |
1211 | ||
5a15f56f AM |
1212 | eh = (struct elf_i386_link_hash_entry *) h; |
1213 | if (eh->dyn_relocs == NULL) | |
1214 | return true; | |
1215 | ||
1216 | if (!info->shared | |
1217 | && (h->elf_link_hash_flags & ELF_LINK_NON_GOT_REF) == 0 | |
56882138 AM |
1218 | && (((h->elf_link_hash_flags & ELF_LINK_HASH_DEF_DYNAMIC) != 0 |
1219 | && (h->elf_link_hash_flags & ELF_LINK_HASH_DEF_REGULAR) == 0) | |
8e1d4bbb AM |
1220 | || (htab->root.dynamic_sections_created |
1221 | && (h->root.type == bfd_link_hash_undefweak | |
1222 | || h->root.type == bfd_link_hash_undefined)))) | |
5a15f56f AM |
1223 | { |
1224 | /* Make sure this symbol is output as a dynamic symbol. | |
1225 | Undefined weak syms won't yet be marked as dynamic. */ | |
1226 | if (h->dynindx == -1 | |
1227 | && (h->elf_link_hash_flags & ELF_LINK_FORCED_LOCAL) == 0) | |
1228 | { | |
1229 | if (! bfd_elf32_link_record_dynamic_symbol (info, h)) | |
1230 | return false; | |
1231 | } | |
1232 | ||
1233 | /* If that succeeded, we know we'll be keeping all the relocs. */ | |
1234 | if (h->dynindx != -1) | |
1235 | return true; | |
1236 | } | |
1237 | ||
1238 | if (!info->shared | |
1239 | || ((h->elf_link_hash_flags & ELF_LINK_HASH_DEF_REGULAR) != 0 | |
1240 | && ((h->elf_link_hash_flags & ELF_LINK_FORCED_LOCAL) != 0 | |
1241 | || info->symbolic))) | |
12d0ee4a | 1242 | { |
ffb2e45b | 1243 | struct elf_i386_dyn_relocs *c; |
12d0ee4a | 1244 | |
ffb2e45b | 1245 | for (c = eh->dyn_relocs; c != NULL; c = c->next) |
12d0ee4a AM |
1246 | c->section->_raw_size -= c->count * sizeof (Elf32_External_Rel); |
1247 | } | |
1248 | ||
6725bdbf AM |
1249 | return true; |
1250 | } | |
1251 | ||
252b5132 RH |
1252 | /* Set the sizes of the dynamic sections. */ |
1253 | ||
1254 | static boolean | |
1255 | elf_i386_size_dynamic_sections (output_bfd, info) | |
db6751f2 | 1256 | bfd *output_bfd ATTRIBUTE_UNUSED; |
252b5132 RH |
1257 | struct bfd_link_info *info; |
1258 | { | |
6725bdbf | 1259 | struct elf_i386_link_hash_table *htab; |
252b5132 RH |
1260 | bfd *dynobj; |
1261 | asection *s; | |
252b5132 | 1262 | boolean relocs; |
161d71a6 | 1263 | bfd *i; |
252b5132 | 1264 | |
6725bdbf AM |
1265 | htab = elf_i386_hash_table (info); |
1266 | dynobj = htab->root.dynobj; | |
ffb2e45b AM |
1267 | if (dynobj == NULL) |
1268 | abort (); | |
252b5132 | 1269 | |
6725bdbf | 1270 | if (htab->root.dynamic_sections_created) |
252b5132 RH |
1271 | { |
1272 | /* Set the contents of the .interp section to the interpreter. */ | |
1273 | if (! info->shared) | |
1274 | { | |
1275 | s = bfd_get_section_by_name (dynobj, ".interp"); | |
ffb2e45b AM |
1276 | if (s == NULL) |
1277 | abort (); | |
252b5132 RH |
1278 | s->_raw_size = sizeof ELF_DYNAMIC_INTERPRETER; |
1279 | s->contents = (unsigned char *) ELF_DYNAMIC_INTERPRETER; | |
1280 | } | |
161d71a6 | 1281 | } |
6725bdbf | 1282 | |
161d71a6 L |
1283 | /* Set up .got offsets for local syms. */ |
1284 | for (i = info->input_bfds; i; i = i->link_next) | |
1285 | { | |
1286 | bfd_signed_vma *local_got; | |
1287 | bfd_signed_vma *end_local_got; | |
1288 | bfd_size_type locsymcount; | |
1289 | Elf_Internal_Shdr *symtab_hdr; | |
1290 | asection *srel; | |
6725bdbf | 1291 | |
161d71a6 L |
1292 | if (bfd_get_flavour (i) != bfd_target_elf_flavour) |
1293 | continue; | |
6725bdbf | 1294 | |
161d71a6 L |
1295 | local_got = elf_local_got_refcounts (i); |
1296 | if (!local_got) | |
1297 | continue; | |
6725bdbf | 1298 | |
161d71a6 L |
1299 | symtab_hdr = &elf_tdata (i)->symtab_hdr; |
1300 | locsymcount = symtab_hdr->sh_info; | |
1301 | end_local_got = local_got + locsymcount; | |
1302 | s = htab->sgot; | |
1303 | srel = htab->srelgot; | |
1304 | for (; local_got < end_local_got; ++local_got) | |
1305 | { | |
1306 | if (*local_got > 0) | |
6725bdbf | 1307 | { |
161d71a6 L |
1308 | *local_got = s->_raw_size; |
1309 | s->_raw_size += 4; | |
1310 | if (info->shared) | |
1311 | srel->_raw_size += sizeof (Elf32_External_Rel); | |
6725bdbf | 1312 | } |
161d71a6 L |
1313 | else |
1314 | *local_got = (bfd_vma) -1; | |
6725bdbf | 1315 | } |
252b5132 | 1316 | } |
6725bdbf | 1317 | |
12d0ee4a AM |
1318 | /* Allocate global sym .plt and .got entries. Also discard all |
1319 | unneeded relocs. */ | |
6725bdbf | 1320 | elf_link_hash_traverse (&htab->root, |
12d0ee4a | 1321 | allocate_plt_and_got_and_discard_relocs, |
6725bdbf | 1322 | (PTR) info); |
252b5132 | 1323 | |
5a15f56f AM |
1324 | /* We now have determined the sizes of the various dynamic sections. |
1325 | Allocate memory for them. */ | |
252b5132 | 1326 | relocs = false; |
252b5132 RH |
1327 | for (s = dynobj->sections; s != NULL; s = s->next) |
1328 | { | |
252b5132 RH |
1329 | if ((s->flags & SEC_LINKER_CREATED) == 0) |
1330 | continue; | |
1331 | ||
6725bdbf AM |
1332 | if (s == htab->splt |
1333 | || s == htab->sgot | |
1334 | || s == htab->sgotplt) | |
252b5132 | 1335 | { |
6725bdbf AM |
1336 | /* Strip this section if we don't need it; see the |
1337 | comment below. */ | |
252b5132 | 1338 | } |
6725bdbf | 1339 | else if (strncmp (bfd_get_section_name (dynobj, s), ".rel", 4) == 0) |
252b5132 RH |
1340 | { |
1341 | if (s->_raw_size == 0) | |
1342 | { | |
1343 | /* If we don't need this section, strip it from the | |
1344 | output file. This is mostly to handle .rel.bss and | |
1345 | .rel.plt. We must create both sections in | |
1346 | create_dynamic_sections, because they must be created | |
1347 | before the linker maps input sections to output | |
1348 | sections. The linker does that before | |
1349 | adjust_dynamic_symbol is called, and it is that | |
1350 | function which decides whether anything needs to go | |
1351 | into these sections. */ | |
252b5132 RH |
1352 | } |
1353 | else | |
1354 | { | |
6725bdbf | 1355 | if (s != htab->srelplt) |
db6751f2 | 1356 | relocs = true; |
252b5132 RH |
1357 | |
1358 | /* We use the reloc_count field as a counter if we need | |
1359 | to copy relocs into the output file. */ | |
1360 | s->reloc_count = 0; | |
1361 | } | |
1362 | } | |
6725bdbf | 1363 | else |
252b5132 RH |
1364 | { |
1365 | /* It's not one of our sections, so don't allocate space. */ | |
1366 | continue; | |
1367 | } | |
1368 | ||
6725bdbf | 1369 | if (s->_raw_size == 0) |
252b5132 | 1370 | { |
7f8d5fc9 | 1371 | _bfd_strip_section_from_output (info, s); |
252b5132 RH |
1372 | continue; |
1373 | } | |
1374 | ||
f69da49f AM |
1375 | /* Allocate memory for the section contents. We use bfd_zalloc |
1376 | here in case unused entries are not reclaimed before the | |
1377 | section's contents are written out. This should not happen, | |
1378 | but this way if it does, we get a R_386_NONE reloc instead | |
1379 | of garbage. */ | |
7a9af8c4 | 1380 | s->contents = (bfd_byte *) bfd_zalloc (dynobj, s->_raw_size); |
6725bdbf | 1381 | if (s->contents == NULL) |
252b5132 RH |
1382 | return false; |
1383 | } | |
1384 | ||
6725bdbf | 1385 | if (htab->root.dynamic_sections_created) |
252b5132 RH |
1386 | { |
1387 | /* Add some entries to the .dynamic section. We fill in the | |
1388 | values later, in elf_i386_finish_dynamic_sections, but we | |
1389 | must add the entries now so that we get the correct size for | |
1390 | the .dynamic section. The DT_DEBUG entry is filled in by the | |
1391 | dynamic linker and used by the debugger. */ | |
dc810e39 AM |
1392 | #define add_dynamic_entry(TAG, VAL) \ |
1393 | bfd_elf32_add_dynamic_entry (info, (bfd_vma) (TAG), (bfd_vma) (VAL)) | |
1394 | ||
252b5132 RH |
1395 | if (! info->shared) |
1396 | { | |
dc810e39 | 1397 | if (!add_dynamic_entry (DT_DEBUG, 0)) |
252b5132 RH |
1398 | return false; |
1399 | } | |
1400 | ||
6725bdbf | 1401 | if (htab->splt->_raw_size != 0) |
252b5132 | 1402 | { |
dc810e39 AM |
1403 | if (!add_dynamic_entry (DT_PLTGOT, 0) |
1404 | || !add_dynamic_entry (DT_PLTRELSZ, 0) | |
1405 | || !add_dynamic_entry (DT_PLTREL, DT_REL) | |
1406 | || !add_dynamic_entry (DT_JMPREL, 0)) | |
252b5132 RH |
1407 | return false; |
1408 | } | |
1409 | ||
1410 | if (relocs) | |
1411 | { | |
dc810e39 AM |
1412 | if (!add_dynamic_entry (DT_REL, 0) |
1413 | || !add_dynamic_entry (DT_RELSZ, 0) | |
1414 | || !add_dynamic_entry (DT_RELENT, sizeof (Elf32_External_Rel))) | |
252b5132 RH |
1415 | return false; |
1416 | } | |
1417 | ||
db6751f2 | 1418 | if ((info->flags & DF_TEXTREL) != 0) |
252b5132 | 1419 | { |
dc810e39 | 1420 | if (!add_dynamic_entry (DT_TEXTREL, 0)) |
252b5132 RH |
1421 | return false; |
1422 | } | |
1423 | } | |
dc810e39 | 1424 | #undef add_dynamic_entry |
252b5132 RH |
1425 | |
1426 | return true; | |
1427 | } | |
1428 | ||
252b5132 RH |
1429 | /* Relocate an i386 ELF section. */ |
1430 | ||
1431 | static boolean | |
1432 | elf_i386_relocate_section (output_bfd, info, input_bfd, input_section, | |
1433 | contents, relocs, local_syms, local_sections) | |
1434 | bfd *output_bfd; | |
1435 | struct bfd_link_info *info; | |
1436 | bfd *input_bfd; | |
1437 | asection *input_section; | |
1438 | bfd_byte *contents; | |
1439 | Elf_Internal_Rela *relocs; | |
1440 | Elf_Internal_Sym *local_syms; | |
1441 | asection **local_sections; | |
1442 | { | |
6725bdbf | 1443 | struct elf_i386_link_hash_table *htab; |
252b5132 RH |
1444 | bfd *dynobj; |
1445 | Elf_Internal_Shdr *symtab_hdr; | |
1446 | struct elf_link_hash_entry **sym_hashes; | |
1447 | bfd_vma *local_got_offsets; | |
252b5132 RH |
1448 | asection *sreloc; |
1449 | Elf_Internal_Rela *rel; | |
1450 | Elf_Internal_Rela *relend; | |
1451 | ||
6725bdbf AM |
1452 | htab = elf_i386_hash_table (info); |
1453 | dynobj = htab->root.dynobj; | |
252b5132 RH |
1454 | symtab_hdr = &elf_tdata (input_bfd)->symtab_hdr; |
1455 | sym_hashes = elf_sym_hashes (input_bfd); | |
1456 | local_got_offsets = elf_local_got_offsets (input_bfd); | |
1457 | ||
252b5132 | 1458 | sreloc = NULL; |
252b5132 RH |
1459 | rel = relocs; |
1460 | relend = relocs + input_section->reloc_count; | |
1461 | for (; rel < relend; rel++) | |
1462 | { | |
1463 | int r_type; | |
1464 | reloc_howto_type *howto; | |
1465 | unsigned long r_symndx; | |
1466 | struct elf_link_hash_entry *h; | |
1467 | Elf_Internal_Sym *sym; | |
1468 | asection *sec; | |
ffb2e45b | 1469 | bfd_vma off; |
252b5132 | 1470 | bfd_vma relocation; |
83be169b | 1471 | boolean unresolved_reloc; |
252b5132 | 1472 | bfd_reloc_status_type r; |
1b452ec6 | 1473 | unsigned int indx; |
252b5132 RH |
1474 | |
1475 | r_type = ELF32_R_TYPE (rel->r_info); | |
dc47f327 AM |
1476 | if (r_type == (int) R_386_GNU_VTINHERIT |
1477 | || r_type == (int) R_386_GNU_VTENTRY) | |
252b5132 | 1478 | continue; |
dc47f327 | 1479 | |
1b452ec6 | 1480 | if ((indx = (unsigned) r_type) >= R_386_standard |
dc47f327 AM |
1481 | && ((indx = (unsigned) r_type - R_386_ext_offset) - R_386_standard |
1482 | >= R_386_ext - R_386_standard)) | |
252b5132 RH |
1483 | { |
1484 | bfd_set_error (bfd_error_bad_value); | |
1485 | return false; | |
1486 | } | |
1b452ec6 | 1487 | howto = elf_howto_table + indx; |
252b5132 RH |
1488 | |
1489 | r_symndx = ELF32_R_SYM (rel->r_info); | |
1490 | ||
1491 | if (info->relocateable) | |
1492 | { | |
1493 | /* This is a relocateable link. We don't have to change | |
1494 | anything, unless the reloc is against a section symbol, | |
1495 | in which case we have to adjust according to where the | |
1496 | section symbol winds up in the output section. */ | |
1497 | if (r_symndx < symtab_hdr->sh_info) | |
1498 | { | |
1499 | sym = local_syms + r_symndx; | |
1500 | if (ELF_ST_TYPE (sym->st_info) == STT_SECTION) | |
1501 | { | |
1502 | bfd_vma val; | |
1503 | ||
1504 | sec = local_sections[r_symndx]; | |
1505 | val = bfd_get_32 (input_bfd, contents + rel->r_offset); | |
1506 | val += sec->output_offset + sym->st_value; | |
1507 | bfd_put_32 (input_bfd, val, contents + rel->r_offset); | |
1508 | } | |
1509 | } | |
1510 | ||
1511 | continue; | |
1512 | } | |
1513 | ||
1514 | /* This is a final link. */ | |
1515 | h = NULL; | |
1516 | sym = NULL; | |
1517 | sec = NULL; | |
83be169b | 1518 | unresolved_reloc = false; |
252b5132 RH |
1519 | if (r_symndx < symtab_hdr->sh_info) |
1520 | { | |
1521 | sym = local_syms + r_symndx; | |
1522 | sec = local_sections[r_symndx]; | |
1523 | relocation = (sec->output_section->vma | |
1524 | + sec->output_offset | |
1525 | + sym->st_value); | |
1526 | } | |
1527 | else | |
1528 | { | |
1529 | h = sym_hashes[r_symndx - symtab_hdr->sh_info]; | |
1530 | while (h->root.type == bfd_link_hash_indirect | |
1531 | || h->root.type == bfd_link_hash_warning) | |
1532 | h = (struct elf_link_hash_entry *) h->root.u.i.link; | |
ffb2e45b | 1533 | |
6725bdbf | 1534 | relocation = 0; |
252b5132 RH |
1535 | if (h->root.type == bfd_link_hash_defined |
1536 | || h->root.type == bfd_link_hash_defweak) | |
1537 | { | |
1538 | sec = h->root.u.def.section; | |
83be169b AM |
1539 | if (sec->output_section == NULL) |
1540 | /* Set a flag that will be cleared later if we find a | |
1541 | relocation value for this symbol. output_section | |
1542 | is typically NULL for symbols satisfied by a shared | |
1543 | library. */ | |
1544 | unresolved_reloc = true; | |
252b5132 RH |
1545 | else |
1546 | relocation = (h->root.u.def.value | |
1547 | + sec->output_section->vma | |
1548 | + sec->output_offset); | |
1549 | } | |
1550 | else if (h->root.type == bfd_link_hash_undefweak) | |
6725bdbf | 1551 | ; |
671bae9c NC |
1552 | else if (info->shared |
1553 | && (!info->symbolic || info->allow_shlib_undefined) | |
3a27a730 L |
1554 | && !info->no_undefined |
1555 | && ELF_ST_VISIBILITY (h->other) == STV_DEFAULT) | |
6725bdbf | 1556 | ; |
252b5132 RH |
1557 | else |
1558 | { | |
1559 | if (! ((*info->callbacks->undefined_symbol) | |
1560 | (info, h->root.root.string, input_bfd, | |
5cc7c785 | 1561 | input_section, rel->r_offset, |
3a27a730 L |
1562 | (!info->shared || info->no_undefined |
1563 | || ELF_ST_VISIBILITY (h->other))))) | |
252b5132 | 1564 | return false; |
252b5132 RH |
1565 | } |
1566 | } | |
1567 | ||
1568 | switch (r_type) | |
1569 | { | |
1570 | case R_386_GOT32: | |
1571 | /* Relocation is to the entry for this symbol in the global | |
1572 | offset table. */ | |
ffb2e45b AM |
1573 | if (htab->sgot == NULL) |
1574 | abort (); | |
252b5132 RH |
1575 | |
1576 | if (h != NULL) | |
1577 | { | |
6725bdbf | 1578 | boolean dyn; |
252b5132 RH |
1579 | |
1580 | off = h->got.offset; | |
6725bdbf AM |
1581 | dyn = htab->root.dynamic_sections_created; |
1582 | if (! WILL_CALL_FINISH_DYNAMIC_SYMBOL (dyn, info, h) | |
252b5132 | 1583 | || (info->shared |
6725bdbf AM |
1584 | && (info->symbolic |
1585 | || h->dynindx == -1 | |
1586 | || (h->elf_link_hash_flags & ELF_LINK_FORCED_LOCAL)) | |
252b5132 RH |
1587 | && (h->elf_link_hash_flags & ELF_LINK_HASH_DEF_REGULAR))) |
1588 | { | |
1589 | /* This is actually a static link, or it is a | |
1590 | -Bsymbolic link and the symbol is defined | |
1591 | locally, or the symbol was forced to be local | |
1592 | because of a version file. We must initialize | |
1593 | this entry in the global offset table. Since the | |
1594 | offset must always be a multiple of 4, we use the | |
1595 | least significant bit to record whether we have | |
1596 | initialized it already. | |
1597 | ||
1598 | When doing a dynamic link, we create a .rel.got | |
1599 | relocation entry to initialize the value. This | |
1600 | is done in the finish_dynamic_symbol routine. */ | |
1601 | if ((off & 1) != 0) | |
1602 | off &= ~1; | |
1603 | else | |
1604 | { | |
1605 | bfd_put_32 (output_bfd, relocation, | |
6725bdbf | 1606 | htab->sgot->contents + off); |
252b5132 RH |
1607 | h->got.offset |= 1; |
1608 | } | |
1609 | } | |
8c694914 AM |
1610 | else |
1611 | unresolved_reloc = false; | |
252b5132 RH |
1612 | } |
1613 | else | |
1614 | { | |
ffb2e45b AM |
1615 | if (local_got_offsets == NULL) |
1616 | abort (); | |
252b5132 RH |
1617 | |
1618 | off = local_got_offsets[r_symndx]; | |
1619 | ||
1620 | /* The offset must always be a multiple of 4. We use | |
83be169b AM |
1621 | the least significant bit to record whether we have |
1622 | already generated the necessary reloc. */ | |
252b5132 RH |
1623 | if ((off & 1) != 0) |
1624 | off &= ~1; | |
1625 | else | |
1626 | { | |
6725bdbf AM |
1627 | bfd_put_32 (output_bfd, relocation, |
1628 | htab->sgot->contents + off); | |
252b5132 RH |
1629 | |
1630 | if (info->shared) | |
1631 | { | |
1632 | asection *srelgot; | |
1633 | Elf_Internal_Rel outrel; | |
1634 | ||
6725bdbf | 1635 | srelgot = htab->srelgot; |
ffb2e45b AM |
1636 | if (srelgot == NULL) |
1637 | abort (); | |
252b5132 | 1638 | |
6725bdbf AM |
1639 | outrel.r_offset = (htab->sgot->output_section->vma |
1640 | + htab->sgot->output_offset | |
252b5132 RH |
1641 | + off); |
1642 | outrel.r_info = ELF32_R_INFO (0, R_386_RELATIVE); | |
1643 | bfd_elf32_swap_reloc_out (output_bfd, &outrel, | |
1644 | (((Elf32_External_Rel *) | |
1645 | srelgot->contents) | |
1646 | + srelgot->reloc_count)); | |
1647 | ++srelgot->reloc_count; | |
1648 | } | |
1649 | ||
1650 | local_got_offsets[r_symndx] |= 1; | |
1651 | } | |
252b5132 RH |
1652 | } |
1653 | ||
ffb2e45b AM |
1654 | if (off >= (bfd_vma) -2) |
1655 | abort (); | |
1656 | ||
1657 | relocation = htab->sgot->output_offset + off; | |
252b5132 RH |
1658 | break; |
1659 | ||
1660 | case R_386_GOTOFF: | |
1661 | /* Relocation is relative to the start of the global offset | |
1662 | table. */ | |
1663 | ||
252b5132 RH |
1664 | /* Note that sgot->output_offset is not involved in this |
1665 | calculation. We always want the start of .got. If we | |
1666 | defined _GLOBAL_OFFSET_TABLE in a different way, as is | |
1667 | permitted by the ABI, we might have to change this | |
1668 | calculation. */ | |
6725bdbf | 1669 | relocation -= htab->sgot->output_section->vma; |
252b5132 RH |
1670 | break; |
1671 | ||
1672 | case R_386_GOTPC: | |
1673 | /* Use global offset table as symbol value. */ | |
6725bdbf | 1674 | relocation = htab->sgot->output_section->vma; |
83be169b | 1675 | unresolved_reloc = false; |
252b5132 RH |
1676 | break; |
1677 | ||
1678 | case R_386_PLT32: | |
1679 | /* Relocation is to the entry for this symbol in the | |
1680 | procedure linkage table. */ | |
1681 | ||
dd5724d5 | 1682 | /* Resolve a PLT32 reloc against a local symbol directly, |
83be169b | 1683 | without using the procedure linkage table. */ |
252b5132 RH |
1684 | if (h == NULL) |
1685 | break; | |
1686 | ||
dd5724d5 | 1687 | if (h->plt.offset == (bfd_vma) -1 |
6725bdbf | 1688 | || htab->splt == NULL) |
252b5132 RH |
1689 | { |
1690 | /* We didn't make a PLT entry for this symbol. This | |
83be169b AM |
1691 | happens when statically linking PIC code, or when |
1692 | using -Bsymbolic. */ | |
252b5132 RH |
1693 | break; |
1694 | } | |
1695 | ||
6725bdbf AM |
1696 | relocation = (htab->splt->output_section->vma |
1697 | + htab->splt->output_offset | |
252b5132 | 1698 | + h->plt.offset); |
83be169b | 1699 | unresolved_reloc = false; |
252b5132 RH |
1700 | break; |
1701 | ||
1702 | case R_386_32: | |
1703 | case R_386_PC32: | |
12d0ee4a AM |
1704 | if ((info->shared |
1705 | && (input_section->flags & SEC_ALLOC) != 0 | |
1706 | && (r_type != R_386_PC32 | |
1707 | || (h != NULL | |
1708 | && h->dynindx != -1 | |
1709 | && (! info->symbolic | |
1710 | || (h->elf_link_hash_flags | |
1711 | & ELF_LINK_HASH_DEF_REGULAR) == 0)))) | |
1712 | || (!info->shared | |
1713 | && (input_section->flags & SEC_ALLOC) != 0 | |
1714 | && h != NULL | |
1715 | && h->dynindx != -1 | |
1716 | && (h->elf_link_hash_flags & ELF_LINK_NON_GOT_REF) == 0 | |
56882138 AM |
1717 | && (((h->elf_link_hash_flags |
1718 | & ELF_LINK_HASH_DEF_DYNAMIC) != 0 | |
1719 | && (h->elf_link_hash_flags | |
1720 | & ELF_LINK_HASH_DEF_REGULAR) == 0) | |
28d0b90e AM |
1721 | || h->root.type == bfd_link_hash_undefweak |
1722 | || h->root.type == bfd_link_hash_undefined))) | |
252b5132 RH |
1723 | { |
1724 | Elf_Internal_Rel outrel; | |
1725 | boolean skip, relocate; | |
1726 | ||
1727 | /* When generating a shared object, these relocations | |
1728 | are copied into the output file to be resolved at run | |
1729 | time. */ | |
1730 | ||
1731 | if (sreloc == NULL) | |
1732 | { | |
1733 | const char *name; | |
1734 | ||
1735 | name = (bfd_elf_string_from_elf_section | |
1736 | (input_bfd, | |
1737 | elf_elfheader (input_bfd)->e_shstrndx, | |
1738 | elf_section_data (input_section)->rel_hdr.sh_name)); | |
1739 | if (name == NULL) | |
1740 | return false; | |
1741 | ||
c8492176 L |
1742 | if (strncmp (name, ".rel", 4) != 0 |
1743 | || strcmp (bfd_get_section_name (input_bfd, | |
1744 | input_section), | |
1745 | name + 4) != 0) | |
1746 | { | |
1747 | if (input_bfd->my_archive) | |
ffb2e45b AM |
1748 | (*_bfd_error_handler)\ |
1749 | (_("%s(%s): bad relocation section name `%s\'"), | |
1750 | bfd_get_filename (input_bfd->my_archive), | |
1751 | bfd_get_filename (input_bfd), | |
1752 | name); | |
c8492176 | 1753 | else |
ffb2e45b AM |
1754 | (*_bfd_error_handler) |
1755 | (_("%s: bad relocation section name `%s\'"), | |
1756 | bfd_get_filename (input_bfd), | |
1757 | name); | |
c8492176 L |
1758 | return false; |
1759 | } | |
252b5132 RH |
1760 | |
1761 | sreloc = bfd_get_section_by_name (dynobj, name); | |
ffb2e45b AM |
1762 | if (sreloc == NULL) |
1763 | abort (); | |
252b5132 RH |
1764 | } |
1765 | ||
1766 | skip = false; | |
1767 | ||
1768 | if (elf_section_data (input_section)->stab_info == NULL) | |
1769 | outrel.r_offset = rel->r_offset; | |
1770 | else | |
1771 | { | |
252b5132 | 1772 | off = (_bfd_stab_section_offset |
12d0ee4a | 1773 | (output_bfd, htab->root.stab_info, input_section, |
252b5132 RH |
1774 | &elf_section_data (input_section)->stab_info, |
1775 | rel->r_offset)); | |
1776 | if (off == (bfd_vma) -1) | |
1777 | skip = true; | |
1778 | outrel.r_offset = off; | |
1779 | } | |
1780 | ||
1781 | outrel.r_offset += (input_section->output_section->vma | |
1782 | + input_section->output_offset); | |
1783 | ||
1784 | if (skip) | |
1785 | { | |
1786 | memset (&outrel, 0, sizeof outrel); | |
1787 | relocate = false; | |
1788 | } | |
5a15f56f AM |
1789 | else if (h != NULL |
1790 | && h->dynindx != -1 | |
1791 | && (r_type == R_386_PC32 | |
1792 | || !info->shared | |
1793 | || !info->symbolic | |
1794 | || (h->elf_link_hash_flags | |
1795 | & ELF_LINK_HASH_DEF_REGULAR) == 0)) | |
1796 | ||
252b5132 | 1797 | { |
252b5132 | 1798 | relocate = false; |
5a15f56f | 1799 | outrel.r_info = ELF32_R_INFO (h->dynindx, r_type); |
252b5132 RH |
1800 | } |
1801 | else | |
1802 | { | |
5a15f56f AM |
1803 | /* This symbol is local, or marked to become local. */ |
1804 | relocate = true; | |
1805 | outrel.r_info = ELF32_R_INFO (0, R_386_RELATIVE); | |
252b5132 RH |
1806 | } |
1807 | ||
1808 | bfd_elf32_swap_reloc_out (output_bfd, &outrel, | |
1809 | (((Elf32_External_Rel *) | |
1810 | sreloc->contents) | |
1811 | + sreloc->reloc_count)); | |
1812 | ++sreloc->reloc_count; | |
1813 | ||
1814 | /* If this reloc is against an external symbol, we do | |
1815 | not want to fiddle with the addend. Otherwise, we | |
1816 | need to include the symbol value so that it becomes | |
1817 | an addend for the dynamic reloc. */ | |
1818 | if (! relocate) | |
1819 | continue; | |
1820 | } | |
1821 | ||
1822 | break; | |
1823 | ||
1824 | default: | |
1825 | break; | |
1826 | } | |
1827 | ||
8c694914 AM |
1828 | /* FIXME: Why do we allow debugging sections to escape this error? |
1829 | More importantly, why do we not emit dynamic relocs for | |
1830 | R_386_32 above in debugging sections (which are ! SEC_ALLOC)? | |
1831 | If we had emitted the dynamic reloc, we could remove the | |
1832 | fudge here. */ | |
1833 | if (unresolved_reloc | |
1834 | && !(info->shared | |
1835 | && (input_section->flags & SEC_DEBUGGING) != 0 | |
1836 | && (h->elf_link_hash_flags & ELF_LINK_HASH_DEF_DYNAMIC) != 0)) | |
83be169b AM |
1837 | (*_bfd_error_handler) |
1838 | (_("%s(%s+0x%lx): unresolvable relocation against symbol `%s'"), | |
1839 | bfd_get_filename (input_bfd), | |
1840 | bfd_get_section_name (input_bfd, input_section), | |
1841 | (long) rel->r_offset, | |
1842 | h->root.root.string); | |
1843 | ||
252b5132 RH |
1844 | r = _bfd_final_link_relocate (howto, input_bfd, input_section, |
1845 | contents, rel->r_offset, | |
1846 | relocation, (bfd_vma) 0); | |
1847 | ||
ffb2e45b | 1848 | switch (r) |
252b5132 | 1849 | { |
ffb2e45b AM |
1850 | case bfd_reloc_ok: |
1851 | break; | |
1852 | ||
1853 | case bfd_reloc_overflow: | |
1854 | { | |
1855 | const char *name; | |
1856 | ||
1857 | if (h != NULL) | |
1858 | name = h->root.root.string; | |
1859 | else | |
252b5132 | 1860 | { |
ffb2e45b AM |
1861 | name = bfd_elf_string_from_elf_section (input_bfd, |
1862 | symtab_hdr->sh_link, | |
1863 | sym->st_name); | |
1864 | if (name == NULL) | |
252b5132 | 1865 | return false; |
ffb2e45b AM |
1866 | if (*name == '\0') |
1867 | name = bfd_section_name (input_bfd, sec); | |
252b5132 | 1868 | } |
ffb2e45b AM |
1869 | if (! ((*info->callbacks->reloc_overflow) |
1870 | (info, name, howto->name, (bfd_vma) 0, | |
1871 | input_bfd, input_section, rel->r_offset))) | |
1872 | return false; | |
1873 | } | |
1874 | break; | |
1875 | ||
1876 | default: | |
1877 | case bfd_reloc_outofrange: | |
1878 | abort (); | |
1879 | break; | |
252b5132 RH |
1880 | } |
1881 | } | |
1882 | ||
1883 | return true; | |
1884 | } | |
1885 | ||
1886 | /* Finish up dynamic symbol handling. We set the contents of various | |
1887 | dynamic sections here. */ | |
1888 | ||
1889 | static boolean | |
1890 | elf_i386_finish_dynamic_symbol (output_bfd, info, h, sym) | |
1891 | bfd *output_bfd; | |
1892 | struct bfd_link_info *info; | |
1893 | struct elf_link_hash_entry *h; | |
1894 | Elf_Internal_Sym *sym; | |
1895 | { | |
6725bdbf | 1896 | struct elf_i386_link_hash_table *htab; |
252b5132 RH |
1897 | bfd *dynobj; |
1898 | ||
6725bdbf AM |
1899 | htab = elf_i386_hash_table (info); |
1900 | dynobj = htab->root.dynobj; | |
252b5132 RH |
1901 | |
1902 | if (h->plt.offset != (bfd_vma) -1) | |
1903 | { | |
252b5132 RH |
1904 | bfd_vma plt_index; |
1905 | bfd_vma got_offset; | |
1906 | Elf_Internal_Rel rel; | |
1907 | ||
1908 | /* This symbol has an entry in the procedure linkage table. Set | |
1909 | it up. */ | |
1910 | ||
ffb2e45b AM |
1911 | if (h->dynindx == -1 |
1912 | || htab->splt == NULL | |
1913 | || htab->sgotplt == NULL | |
1914 | || htab->srelplt == NULL) | |
1915 | abort (); | |
252b5132 RH |
1916 | |
1917 | /* Get the index in the procedure linkage table which | |
1918 | corresponds to this symbol. This is the index of this symbol | |
1919 | in all the symbols for which we are making plt entries. The | |
1920 | first entry in the procedure linkage table is reserved. */ | |
1921 | plt_index = h->plt.offset / PLT_ENTRY_SIZE - 1; | |
1922 | ||
1923 | /* Get the offset into the .got table of the entry that | |
1924 | corresponds to this function. Each .got entry is 4 bytes. | |
1925 | The first three are reserved. */ | |
1926 | got_offset = (plt_index + 3) * 4; | |
1927 | ||
1928 | /* Fill in the entry in the procedure linkage table. */ | |
1929 | if (! info->shared) | |
1930 | { | |
6725bdbf | 1931 | memcpy (htab->splt->contents + h->plt.offset, elf_i386_plt_entry, |
252b5132 RH |
1932 | PLT_ENTRY_SIZE); |
1933 | bfd_put_32 (output_bfd, | |
6725bdbf AM |
1934 | (htab->sgotplt->output_section->vma |
1935 | + htab->sgotplt->output_offset | |
252b5132 | 1936 | + got_offset), |
6725bdbf | 1937 | htab->splt->contents + h->plt.offset + 2); |
252b5132 RH |
1938 | } |
1939 | else | |
1940 | { | |
6725bdbf | 1941 | memcpy (htab->splt->contents + h->plt.offset, elf_i386_pic_plt_entry, |
252b5132 RH |
1942 | PLT_ENTRY_SIZE); |
1943 | bfd_put_32 (output_bfd, got_offset, | |
6725bdbf | 1944 | htab->splt->contents + h->plt.offset + 2); |
252b5132 RH |
1945 | } |
1946 | ||
1947 | bfd_put_32 (output_bfd, plt_index * sizeof (Elf32_External_Rel), | |
6725bdbf | 1948 | htab->splt->contents + h->plt.offset + 7); |
252b5132 | 1949 | bfd_put_32 (output_bfd, - (h->plt.offset + PLT_ENTRY_SIZE), |
6725bdbf | 1950 | htab->splt->contents + h->plt.offset + 12); |
252b5132 RH |
1951 | |
1952 | /* Fill in the entry in the global offset table. */ | |
1953 | bfd_put_32 (output_bfd, | |
6725bdbf AM |
1954 | (htab->splt->output_section->vma |
1955 | + htab->splt->output_offset | |
252b5132 RH |
1956 | + h->plt.offset |
1957 | + 6), | |
6725bdbf | 1958 | htab->sgotplt->contents + got_offset); |
252b5132 RH |
1959 | |
1960 | /* Fill in the entry in the .rel.plt section. */ | |
6725bdbf AM |
1961 | rel.r_offset = (htab->sgotplt->output_section->vma |
1962 | + htab->sgotplt->output_offset | |
252b5132 RH |
1963 | + got_offset); |
1964 | rel.r_info = ELF32_R_INFO (h->dynindx, R_386_JUMP_SLOT); | |
1965 | bfd_elf32_swap_reloc_out (output_bfd, &rel, | |
6725bdbf | 1966 | ((Elf32_External_Rel *) htab->srelplt->contents |
252b5132 RH |
1967 | + plt_index)); |
1968 | ||
1969 | if ((h->elf_link_hash_flags & ELF_LINK_HASH_DEF_REGULAR) == 0) | |
1970 | { | |
1971 | /* Mark the symbol as undefined, rather than as defined in | |
1972 | the .plt section. Leave the value alone. */ | |
1973 | sym->st_shndx = SHN_UNDEF; | |
1974 | } | |
1975 | } | |
1976 | ||
1977 | if (h->got.offset != (bfd_vma) -1) | |
1978 | { | |
252b5132 RH |
1979 | Elf_Internal_Rel rel; |
1980 | ||
1981 | /* This symbol has an entry in the global offset table. Set it | |
1982 | up. */ | |
1983 | ||
ffb2e45b AM |
1984 | if (htab->sgot == NULL || htab->srelgot == NULL) |
1985 | abort (); | |
252b5132 | 1986 | |
6725bdbf AM |
1987 | rel.r_offset = (htab->sgot->output_section->vma |
1988 | + htab->sgot->output_offset | |
dc810e39 | 1989 | + (h->got.offset & ~(bfd_vma) 1)); |
252b5132 | 1990 | |
dd5724d5 AM |
1991 | /* If this is a static link, or it is a -Bsymbolic link and the |
1992 | symbol is defined locally or was forced to be local because | |
1993 | of a version file, we just want to emit a RELATIVE reloc. | |
252b5132 RH |
1994 | The entry in the global offset table will already have been |
1995 | initialized in the relocate_section function. */ | |
6725bdbf AM |
1996 | if (info->shared |
1997 | && (info->symbolic | |
1998 | || h->dynindx == -1 | |
1999 | || (h->elf_link_hash_flags & ELF_LINK_FORCED_LOCAL)) | |
2000 | && (h->elf_link_hash_flags & ELF_LINK_HASH_DEF_REGULAR)) | |
dd5724d5 | 2001 | { |
6725bdbf | 2002 | BFD_ASSERT((h->got.offset & 1) != 0); |
dd5724d5 AM |
2003 | rel.r_info = ELF32_R_INFO (0, R_386_RELATIVE); |
2004 | } | |
252b5132 RH |
2005 | else |
2006 | { | |
dd5724d5 | 2007 | BFD_ASSERT((h->got.offset & 1) == 0); |
6725bdbf AM |
2008 | bfd_put_32 (output_bfd, (bfd_vma) 0, |
2009 | htab->sgot->contents + h->got.offset); | |
252b5132 RH |
2010 | rel.r_info = ELF32_R_INFO (h->dynindx, R_386_GLOB_DAT); |
2011 | } | |
2012 | ||
2013 | bfd_elf32_swap_reloc_out (output_bfd, &rel, | |
6725bdbf AM |
2014 | ((Elf32_External_Rel *) htab->srelgot->contents |
2015 | + htab->srelgot->reloc_count)); | |
2016 | ++htab->srelgot->reloc_count; | |
252b5132 RH |
2017 | } |
2018 | ||
791987af | 2019 | if ((h->elf_link_hash_flags & ELF_LINK_HASH_NEEDS_COPY) != 0) |
252b5132 | 2020 | { |
252b5132 RH |
2021 | Elf_Internal_Rel rel; |
2022 | ||
2023 | /* This symbol needs a copy reloc. Set it up. */ | |
2024 | ||
ffb2e45b AM |
2025 | if (h->dynindx == -1 |
2026 | || (h->root.type != bfd_link_hash_defined | |
2027 | && h->root.type != bfd_link_hash_defweak) | |
2028 | || htab->srelbss == NULL) | |
2029 | abort (); | |
252b5132 RH |
2030 | |
2031 | rel.r_offset = (h->root.u.def.value | |
2032 | + h->root.u.def.section->output_section->vma | |
2033 | + h->root.u.def.section->output_offset); | |
2034 | rel.r_info = ELF32_R_INFO (h->dynindx, R_386_COPY); | |
2035 | bfd_elf32_swap_reloc_out (output_bfd, &rel, | |
6725bdbf AM |
2036 | ((Elf32_External_Rel *) htab->srelbss->contents |
2037 | + htab->srelbss->reloc_count)); | |
2038 | ++htab->srelbss->reloc_count; | |
252b5132 RH |
2039 | } |
2040 | ||
2041 | /* Mark _DYNAMIC and _GLOBAL_OFFSET_TABLE_ as absolute. */ | |
2042 | if (strcmp (h->root.root.string, "_DYNAMIC") == 0 | |
2043 | || strcmp (h->root.root.string, "_GLOBAL_OFFSET_TABLE_") == 0) | |
2044 | sym->st_shndx = SHN_ABS; | |
2045 | ||
2046 | return true; | |
2047 | } | |
2048 | ||
2049 | /* Finish up the dynamic sections. */ | |
2050 | ||
2051 | static boolean | |
2052 | elf_i386_finish_dynamic_sections (output_bfd, info) | |
2053 | bfd *output_bfd; | |
2054 | struct bfd_link_info *info; | |
2055 | { | |
6725bdbf | 2056 | struct elf_i386_link_hash_table *htab; |
252b5132 | 2057 | bfd *dynobj; |
252b5132 RH |
2058 | asection *sdyn; |
2059 | ||
6725bdbf AM |
2060 | htab = elf_i386_hash_table (info); |
2061 | dynobj = htab->root.dynobj; | |
252b5132 RH |
2062 | sdyn = bfd_get_section_by_name (dynobj, ".dynamic"); |
2063 | ||
6725bdbf | 2064 | if (htab->root.dynamic_sections_created) |
252b5132 | 2065 | { |
252b5132 RH |
2066 | Elf32_External_Dyn *dyncon, *dynconend; |
2067 | ||
ffb2e45b AM |
2068 | if (sdyn == NULL || htab->sgot == NULL) |
2069 | abort (); | |
252b5132 RH |
2070 | |
2071 | dyncon = (Elf32_External_Dyn *) sdyn->contents; | |
2072 | dynconend = (Elf32_External_Dyn *) (sdyn->contents + sdyn->_raw_size); | |
2073 | for (; dyncon < dynconend; dyncon++) | |
2074 | { | |
2075 | Elf_Internal_Dyn dyn; | |
252b5132 RH |
2076 | |
2077 | bfd_elf32_swap_dyn_in (dynobj, dyncon, &dyn); | |
2078 | ||
2079 | switch (dyn.d_tag) | |
2080 | { | |
2081 | default: | |
2082 | break; | |
2083 | ||
2084 | case DT_PLTGOT: | |
6725bdbf AM |
2085 | dyn.d_un.d_ptr = htab->sgot->output_section->vma; |
2086 | bfd_elf32_swap_dyn_out (output_bfd, &dyn, dyncon); | |
2087 | break; | |
2088 | ||
252b5132 | 2089 | case DT_JMPREL: |
6725bdbf | 2090 | dyn.d_un.d_ptr = htab->srelplt->output_section->vma; |
252b5132 RH |
2091 | bfd_elf32_swap_dyn_out (output_bfd, &dyn, dyncon); |
2092 | break; | |
2093 | ||
2094 | case DT_PLTRELSZ: | |
6725bdbf AM |
2095 | if (htab->srelplt->output_section->_cooked_size != 0) |
2096 | dyn.d_un.d_val = htab->srelplt->output_section->_cooked_size; | |
252b5132 | 2097 | else |
6725bdbf | 2098 | dyn.d_un.d_val = htab->srelplt->output_section->_raw_size; |
252b5132 RH |
2099 | bfd_elf32_swap_dyn_out (output_bfd, &dyn, dyncon); |
2100 | break; | |
2101 | ||
2102 | case DT_RELSZ: | |
2103 | /* My reading of the SVR4 ABI indicates that the | |
2104 | procedure linkage table relocs (DT_JMPREL) should be | |
2105 | included in the overall relocs (DT_REL). This is | |
2106 | what Solaris does. However, UnixWare can not handle | |
2107 | that case. Therefore, we override the DT_RELSZ entry | |
2108 | here to make it not include the JMPREL relocs. Since | |
2109 | the linker script arranges for .rel.plt to follow all | |
2110 | other relocation sections, we don't have to worry | |
2111 | about changing the DT_REL entry. */ | |
6725bdbf | 2112 | if (htab->srelplt != NULL) |
252b5132 | 2113 | { |
6725bdbf AM |
2114 | if (htab->srelplt->output_section->_cooked_size != 0) |
2115 | dyn.d_un.d_val -= htab->srelplt->output_section->_cooked_size; | |
252b5132 | 2116 | else |
6725bdbf | 2117 | dyn.d_un.d_val -= htab->srelplt->output_section->_raw_size; |
252b5132 RH |
2118 | } |
2119 | bfd_elf32_swap_dyn_out (output_bfd, &dyn, dyncon); | |
2120 | break; | |
2121 | } | |
2122 | } | |
2123 | ||
2124 | /* Fill in the first entry in the procedure linkage table. */ | |
6725bdbf | 2125 | if (htab->splt && htab->splt->_raw_size > 0) |
252b5132 RH |
2126 | { |
2127 | if (info->shared) | |
6725bdbf AM |
2128 | memcpy (htab->splt->contents, |
2129 | elf_i386_pic_plt0_entry, PLT_ENTRY_SIZE); | |
252b5132 RH |
2130 | else |
2131 | { | |
6725bdbf AM |
2132 | memcpy (htab->splt->contents, |
2133 | elf_i386_plt0_entry, PLT_ENTRY_SIZE); | |
252b5132 | 2134 | bfd_put_32 (output_bfd, |
6725bdbf AM |
2135 | (htab->sgotplt->output_section->vma |
2136 | + htab->sgotplt->output_offset | |
2137 | + 4), | |
2138 | htab->splt->contents + 2); | |
252b5132 | 2139 | bfd_put_32 (output_bfd, |
6725bdbf AM |
2140 | (htab->sgotplt->output_section->vma |
2141 | + htab->sgotplt->output_offset | |
2142 | + 8), | |
2143 | htab->splt->contents + 8); | |
252b5132 RH |
2144 | } |
2145 | ||
2146 | /* UnixWare sets the entsize of .plt to 4, although that doesn't | |
2147 | really seem like the right value. */ | |
6725bdbf AM |
2148 | elf_section_data (htab->splt->output_section) |
2149 | ->this_hdr.sh_entsize = 4; | |
252b5132 RH |
2150 | } |
2151 | } | |
2152 | ||
12d0ee4a | 2153 | if (htab->sgotplt) |
252b5132 | 2154 | { |
12d0ee4a AM |
2155 | /* Fill in the first three entries in the global offset table. */ |
2156 | if (htab->sgotplt->_raw_size > 0) | |
2157 | { | |
2158 | bfd_put_32 (output_bfd, | |
2159 | (sdyn == NULL ? (bfd_vma) 0 | |
2160 | : sdyn->output_section->vma + sdyn->output_offset), | |
2161 | htab->sgotplt->contents); | |
2162 | bfd_put_32 (output_bfd, (bfd_vma) 0, htab->sgotplt->contents + 4); | |
2163 | bfd_put_32 (output_bfd, (bfd_vma) 0, htab->sgotplt->contents + 8); | |
2164 | } | |
252b5132 | 2165 | |
12d0ee4a AM |
2166 | elf_section_data (htab->sgotplt->output_section)->this_hdr.sh_entsize = 4; |
2167 | } | |
252b5132 RH |
2168 | return true; |
2169 | } | |
2170 | ||
dd484e5c L |
2171 | /* Set the correct type for an x86 ELF section. We do this by the |
2172 | section name, which is a hack, but ought to work. */ | |
2173 | ||
2174 | static boolean | |
2175 | elf_i386_fake_sections (abfd, hdr, sec) | |
2176 | bfd *abfd ATTRIBUTE_UNUSED; | |
2177 | Elf32_Internal_Shdr *hdr; | |
2178 | asection *sec; | |
2179 | { | |
2180 | register const char *name; | |
2181 | ||
2182 | name = bfd_get_section_name (abfd, sec); | |
2183 | ||
2184 | if (strcmp (name, ".reloc") == 0) | |
2185 | /* | |
2186 | * This is an ugly, but unfortunately necessary hack that is | |
2187 | * needed when producing EFI binaries on x86. It tells | |
2188 | * elf.c:elf_fake_sections() not to consider ".reloc" as a section | |
2189 | * containing ELF relocation info. We need this hack in order to | |
2190 | * be able to generate ELF binaries that can be translated into | |
2191 | * EFI applications (which are essentially COFF objects). Those | |
2192 | * files contain a COFF ".reloc" section inside an ELFNN object, | |
2193 | * which would normally cause BFD to segfault because it would | |
2194 | * attempt to interpret this section as containing relocation | |
2195 | * entries for section "oc". With this hack enabled, ".reloc" | |
2196 | * will be treated as a normal data section, which will avoid the | |
2197 | * segfault. However, you won't be able to create an ELFNN binary | |
2198 | * with a section named "oc" that needs relocations, but that's | |
2199 | * the kind of ugly side-effects you get when detecting section | |
2200 | * types based on their names... In practice, this limitation is | |
2201 | * unlikely to bite. | |
2202 | */ | |
2203 | hdr->sh_type = SHT_PROGBITS; | |
2204 | ||
2205 | return true; | |
2206 | } | |
2207 | ||
db6751f2 JJ |
2208 | static enum elf_reloc_type_class |
2209 | elf_i386_reloc_type_class (type) | |
2210 | int type; | |
2211 | { | |
2212 | switch (type) | |
2213 | { | |
2214 | case R_386_RELATIVE: | |
2215 | return reloc_class_relative; | |
2216 | case R_386_JUMP_SLOT: | |
2217 | return reloc_class_plt; | |
2218 | case R_386_COPY: | |
2219 | return reloc_class_copy; | |
2220 | default: | |
2221 | return reloc_class_normal; | |
2222 | } | |
2223 | } | |
dd484e5c | 2224 | |
c5fccbec DJ |
2225 | /* Support for core dump NOTE sections */ |
2226 | static boolean | |
2227 | elf_i386_grok_prstatus (abfd, note) | |
2228 | bfd *abfd; | |
2229 | Elf_Internal_Note *note; | |
2230 | { | |
2231 | int offset; | |
dc810e39 | 2232 | size_t raw_size; |
c5fccbec DJ |
2233 | |
2234 | switch (note->descsz) | |
2235 | { | |
2236 | default: | |
2237 | return false; | |
2238 | ||
2239 | case 144: /* Linux/i386 */ | |
2240 | /* pr_cursig */ | |
2241 | elf_tdata (abfd)->core_signal = bfd_get_16 (abfd, note->descdata + 12); | |
2242 | ||
2243 | /* pr_pid */ | |
2244 | elf_tdata (abfd)->core_pid = bfd_get_32 (abfd, note->descdata + 24); | |
2245 | ||
2246 | /* pr_reg */ | |
2247 | offset = 72; | |
2248 | raw_size = 68; | |
2249 | ||
2250 | break; | |
2251 | } | |
2252 | ||
2253 | /* Make a ".reg/999" section. */ | |
2254 | return _bfd_elfcore_make_pseudosection (abfd, ".reg", | |
2255 | raw_size, note->descpos + offset); | |
2256 | } | |
2257 | ||
2258 | static boolean | |
2259 | elf_i386_grok_psinfo (abfd, note) | |
2260 | bfd *abfd; | |
2261 | Elf_Internal_Note *note; | |
2262 | { | |
2263 | switch (note->descsz) | |
2264 | { | |
2265 | default: | |
2266 | return false; | |
2267 | ||
2268 | case 128: /* Linux/MIPS elf_prpsinfo */ | |
2269 | elf_tdata (abfd)->core_program | |
2270 | = _bfd_elfcore_strndup (abfd, note->descdata + 28, 16); | |
2271 | elf_tdata (abfd)->core_command | |
2272 | = _bfd_elfcore_strndup (abfd, note->descdata + 44, 80); | |
2273 | } | |
2274 | ||
2275 | /* Note that for some reason, a spurious space is tacked | |
2276 | onto the end of the args in some (at least one anyway) | |
2277 | implementations, so strip it off if it exists. */ | |
2278 | ||
2279 | { | |
2280 | char *command = elf_tdata (abfd)->core_command; | |
2281 | int n = strlen (command); | |
2282 | ||
2283 | if (0 < n && command[n - 1] == ' ') | |
2284 | command[n - 1] = '\0'; | |
2285 | } | |
2286 | ||
2287 | return true; | |
2288 | } | |
2289 | ||
252b5132 RH |
2290 | #define TARGET_LITTLE_SYM bfd_elf32_i386_vec |
2291 | #define TARGET_LITTLE_NAME "elf32-i386" | |
2292 | #define ELF_ARCH bfd_arch_i386 | |
2293 | #define ELF_MACHINE_CODE EM_386 | |
2294 | #define ELF_MAXPAGESIZE 0x1000 | |
252b5132 RH |
2295 | |
2296 | #define elf_backend_can_gc_sections 1 | |
2297 | #define elf_backend_want_got_plt 1 | |
2298 | #define elf_backend_plt_readonly 1 | |
2299 | #define elf_backend_want_plt_sym 0 | |
2300 | #define elf_backend_got_header_size 12 | |
2301 | #define elf_backend_plt_header_size PLT_ENTRY_SIZE | |
2302 | ||
dd5724d5 AM |
2303 | #define elf_info_to_howto elf_i386_info_to_howto |
2304 | #define elf_info_to_howto_rel elf_i386_info_to_howto_rel | |
2305 | ||
dd5724d5 AM |
2306 | #define bfd_elf32_bfd_is_local_label_name elf_i386_is_local_label_name |
2307 | #define bfd_elf32_bfd_link_hash_table_create elf_i386_link_hash_table_create | |
2308 | #define bfd_elf32_bfd_reloc_type_lookup elf_i386_reloc_type_lookup | |
2309 | ||
2310 | #define elf_backend_adjust_dynamic_symbol elf_i386_adjust_dynamic_symbol | |
2311 | #define elf_backend_check_relocs elf_i386_check_relocs | |
6725bdbf | 2312 | #define elf_backend_create_dynamic_sections elf_i386_create_dynamic_sections |
dd5724d5 AM |
2313 | #define elf_backend_finish_dynamic_sections elf_i386_finish_dynamic_sections |
2314 | #define elf_backend_finish_dynamic_symbol elf_i386_finish_dynamic_symbol | |
2315 | #define elf_backend_gc_mark_hook elf_i386_gc_mark_hook | |
2316 | #define elf_backend_gc_sweep_hook elf_i386_gc_sweep_hook | |
2317 | #define elf_backend_relocate_section elf_i386_relocate_section | |
2318 | #define elf_backend_size_dynamic_sections elf_i386_size_dynamic_sections | |
83be169b | 2319 | #define elf_backend_fake_sections elf_i386_fake_sections |
c5fccbec DJ |
2320 | #define elf_backend_grok_prstatus elf_i386_grok_prstatus |
2321 | #define elf_backend_grok_psinfo elf_i386_grok_psinfo | |
db6751f2 | 2322 | #define elf_backend_reloc_type_class elf_i386_reloc_type_class |
dd5724d5 | 2323 | |
252b5132 | 2324 | #include "elf32-target.h" |