Commit | Line | Data |
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c906108c | 1 | /* Read ELF (Executable and Linking Format) object files for GDB. |
1bac305b | 2 | |
6aba47ca | 3 | Copyright (C) 1991, 1992, 1993, 1994, 1995, 1996, 1997, 1998, 1999, 2000, |
7b6bb8da | 4 | 2001, 2002, 2003, 2004, 2005, 2006, 2007, 2008, 2009, 2010, 2011 |
9b254dd1 | 5 | Free Software Foundation, Inc. |
1bac305b | 6 | |
c906108c SS |
7 | Written by Fred Fish at Cygnus Support. |
8 | ||
c5aa993b | 9 | This file is part of GDB. |
c906108c | 10 | |
c5aa993b JM |
11 | This program is free software; you can redistribute it and/or modify |
12 | it under the terms of the GNU General Public License as published by | |
a9762ec7 | 13 | the Free Software Foundation; either version 3 of the License, or |
c5aa993b | 14 | (at your option) any later version. |
c906108c | 15 | |
c5aa993b JM |
16 | This program is distributed in the hope that it will be useful, |
17 | but WITHOUT ANY WARRANTY; without even the implied warranty of | |
18 | MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the | |
19 | GNU General Public License for more details. | |
c906108c | 20 | |
c5aa993b | 21 | You should have received a copy of the GNU General Public License |
a9762ec7 | 22 | along with this program. If not, see <http://www.gnu.org/licenses/>. */ |
c906108c SS |
23 | |
24 | #include "defs.h" | |
25 | #include "bfd.h" | |
26 | #include "gdb_string.h" | |
27 | #include "elf-bfd.h" | |
31d99776 DJ |
28 | #include "elf/common.h" |
29 | #include "elf/internal.h" | |
c906108c SS |
30 | #include "elf/mips.h" |
31 | #include "symtab.h" | |
32 | #include "symfile.h" | |
33 | #include "objfiles.h" | |
34 | #include "buildsym.h" | |
35 | #include "stabsread.h" | |
36 | #include "gdb-stabs.h" | |
37 | #include "complaints.h" | |
38 | #include "demangle.h" | |
ccefe4c4 | 39 | #include "psympriv.h" |
0ba1096a | 40 | #include "filenames.h" |
c906108c | 41 | |
a14ed312 | 42 | extern void _initialize_elfread (void); |
392a587b | 43 | |
b11896a5 | 44 | /* Forward declarations. */ |
00b5771c | 45 | static const struct sym_fns elf_sym_fns_gdb_index; |
b11896a5 | 46 | static const struct sym_fns elf_sym_fns_lazy_psyms; |
9291a0cd | 47 | |
c906108c | 48 | /* The struct elfinfo is available only during ELF symbol table and |
6426a772 | 49 | psymtab reading. It is destroyed at the completion of psymtab-reading. |
c906108c SS |
50 | It's local to elf_symfile_read. */ |
51 | ||
c5aa993b JM |
52 | struct elfinfo |
53 | { | |
c5aa993b JM |
54 | asection *stabsect; /* Section pointer for .stab section */ |
55 | asection *stabindexsect; /* Section pointer for .stab.index section */ | |
56 | asection *mdebugsect; /* Section pointer for .mdebug section */ | |
57 | }; | |
c906108c | 58 | |
12b9c64f | 59 | static void free_elfinfo (void *); |
c906108c | 60 | |
31d99776 DJ |
61 | /* Locate the segments in ABFD. */ |
62 | ||
63 | static struct symfile_segment_data * | |
64 | elf_symfile_segments (bfd *abfd) | |
65 | { | |
66 | Elf_Internal_Phdr *phdrs, **segments; | |
67 | long phdrs_size; | |
68 | int num_phdrs, num_segments, num_sections, i; | |
69 | asection *sect; | |
70 | struct symfile_segment_data *data; | |
71 | ||
72 | phdrs_size = bfd_get_elf_phdr_upper_bound (abfd); | |
73 | if (phdrs_size == -1) | |
74 | return NULL; | |
75 | ||
76 | phdrs = alloca (phdrs_size); | |
77 | num_phdrs = bfd_get_elf_phdrs (abfd, phdrs); | |
78 | if (num_phdrs == -1) | |
79 | return NULL; | |
80 | ||
81 | num_segments = 0; | |
82 | segments = alloca (sizeof (Elf_Internal_Phdr *) * num_phdrs); | |
83 | for (i = 0; i < num_phdrs; i++) | |
84 | if (phdrs[i].p_type == PT_LOAD) | |
85 | segments[num_segments++] = &phdrs[i]; | |
86 | ||
87 | if (num_segments == 0) | |
88 | return NULL; | |
89 | ||
90 | data = XZALLOC (struct symfile_segment_data); | |
91 | data->num_segments = num_segments; | |
92 | data->segment_bases = XCALLOC (num_segments, CORE_ADDR); | |
93 | data->segment_sizes = XCALLOC (num_segments, CORE_ADDR); | |
94 | ||
95 | for (i = 0; i < num_segments; i++) | |
96 | { | |
97 | data->segment_bases[i] = segments[i]->p_vaddr; | |
98 | data->segment_sizes[i] = segments[i]->p_memsz; | |
99 | } | |
100 | ||
101 | num_sections = bfd_count_sections (abfd); | |
102 | data->segment_info = XCALLOC (num_sections, int); | |
103 | ||
104 | for (i = 0, sect = abfd->sections; sect != NULL; i++, sect = sect->next) | |
105 | { | |
106 | int j; | |
107 | CORE_ADDR vma; | |
108 | ||
109 | if ((bfd_get_section_flags (abfd, sect) & SEC_ALLOC) == 0) | |
110 | continue; | |
111 | ||
112 | vma = bfd_get_section_vma (abfd, sect); | |
113 | ||
114 | for (j = 0; j < num_segments; j++) | |
115 | if (segments[j]->p_memsz > 0 | |
116 | && vma >= segments[j]->p_vaddr | |
a366c65a | 117 | && (vma - segments[j]->p_vaddr) < segments[j]->p_memsz) |
31d99776 DJ |
118 | { |
119 | data->segment_info[i] = j + 1; | |
120 | break; | |
121 | } | |
122 | ||
ad09a548 DJ |
123 | /* We should have found a segment for every non-empty section. |
124 | If we haven't, we will not relocate this section by any | |
125 | offsets we apply to the segments. As an exception, do not | |
126 | warn about SHT_NOBITS sections; in normal ELF execution | |
127 | environments, SHT_NOBITS means zero-initialized and belongs | |
128 | in a segment, but in no-OS environments some tools (e.g. ARM | |
129 | RealView) use SHT_NOBITS for uninitialized data. Since it is | |
130 | uninitialized, it doesn't need a program header. Such | |
131 | binaries are not relocatable. */ | |
132 | if (bfd_get_section_size (sect) > 0 && j == num_segments | |
133 | && (bfd_get_section_flags (abfd, sect) & SEC_LOAD) != 0) | |
31d99776 DJ |
134 | warning (_("Loadable segment \"%s\" outside of ELF segments"), |
135 | bfd_section_name (abfd, sect)); | |
136 | } | |
137 | ||
138 | return data; | |
139 | } | |
140 | ||
c906108c SS |
141 | /* We are called once per section from elf_symfile_read. We |
142 | need to examine each section we are passed, check to see | |
143 | if it is something we are interested in processing, and | |
144 | if so, stash away some access information for the section. | |
145 | ||
146 | For now we recognize the dwarf debug information sections and | |
147 | line number sections from matching their section names. The | |
148 | ELF definition is no real help here since it has no direct | |
149 | knowledge of DWARF (by design, so any debugging format can be | |
150 | used). | |
151 | ||
152 | We also recognize the ".stab" sections used by the Sun compilers | |
153 | released with Solaris 2. | |
154 | ||
155 | FIXME: The section names should not be hardwired strings (what | |
156 | should they be? I don't think most object file formats have enough | |
0963b4bd | 157 | section flags to specify what kind of debug section it is. |
c906108c SS |
158 | -kingdon). */ |
159 | ||
160 | static void | |
12b9c64f | 161 | elf_locate_sections (bfd *ignore_abfd, asection *sectp, void *eip) |
c906108c | 162 | { |
52f0bd74 | 163 | struct elfinfo *ei; |
c906108c SS |
164 | |
165 | ei = (struct elfinfo *) eip; | |
7ce59000 | 166 | if (strcmp (sectp->name, ".stab") == 0) |
c906108c | 167 | { |
c5aa993b | 168 | ei->stabsect = sectp; |
c906108c | 169 | } |
6314a349 | 170 | else if (strcmp (sectp->name, ".stab.index") == 0) |
c906108c | 171 | { |
c5aa993b | 172 | ei->stabindexsect = sectp; |
c906108c | 173 | } |
6314a349 | 174 | else if (strcmp (sectp->name, ".mdebug") == 0) |
c906108c | 175 | { |
c5aa993b | 176 | ei->mdebugsect = sectp; |
c906108c SS |
177 | } |
178 | } | |
179 | ||
c906108c | 180 | static struct minimal_symbol * |
04a679b8 TT |
181 | record_minimal_symbol (const char *name, int name_len, int copy_name, |
182 | CORE_ADDR address, | |
f594e5e9 MC |
183 | enum minimal_symbol_type ms_type, |
184 | asection *bfd_section, struct objfile *objfile) | |
c906108c | 185 | { |
5e2b427d UW |
186 | struct gdbarch *gdbarch = get_objfile_arch (objfile); |
187 | ||
bbeae047 | 188 | if (ms_type == mst_text || ms_type == mst_file_text) |
5e2b427d | 189 | address = gdbarch_smash_text_address (gdbarch, address); |
c906108c | 190 | |
04a679b8 TT |
191 | return prim_record_minimal_symbol_full (name, name_len, copy_name, address, |
192 | ms_type, bfd_section->index, | |
193 | bfd_section, objfile); | |
c906108c SS |
194 | } |
195 | ||
196 | /* | |
197 | ||
c5aa993b | 198 | LOCAL FUNCTION |
c906108c | 199 | |
c5aa993b | 200 | elf_symtab_read -- read the symbol table of an ELF file |
c906108c | 201 | |
c5aa993b | 202 | SYNOPSIS |
c906108c | 203 | |
6f610d07 | 204 | void elf_symtab_read (struct objfile *objfile, int type, |
62553543 | 205 | long number_of_symbols, asymbol **symbol_table) |
c906108c | 206 | |
c5aa993b | 207 | DESCRIPTION |
c906108c | 208 | |
62553543 | 209 | Given an objfile, a symbol table, and a flag indicating whether the |
6f610d07 UW |
210 | symbol table contains regular, dynamic, or synthetic symbols, add all |
211 | the global function and data symbols to the minimal symbol table. | |
c906108c | 212 | |
c5aa993b JM |
213 | In stabs-in-ELF, as implemented by Sun, there are some local symbols |
214 | defined in the ELF symbol table, which can be used to locate | |
215 | the beginnings of sections from each ".o" file that was linked to | |
216 | form the executable objfile. We gather any such info and record it | |
217 | in data structures hung off the objfile's private data. | |
c906108c | 218 | |
c5aa993b | 219 | */ |
c906108c | 220 | |
6f610d07 UW |
221 | #define ST_REGULAR 0 |
222 | #define ST_DYNAMIC 1 | |
223 | #define ST_SYNTHETIC 2 | |
224 | ||
c906108c | 225 | static void |
6f610d07 | 226 | elf_symtab_read (struct objfile *objfile, int type, |
04a679b8 TT |
227 | long number_of_symbols, asymbol **symbol_table, |
228 | int copy_names) | |
c906108c | 229 | { |
5e2b427d | 230 | struct gdbarch *gdbarch = get_objfile_arch (objfile); |
c906108c | 231 | asymbol *sym; |
c906108c | 232 | long i; |
c906108c | 233 | CORE_ADDR symaddr; |
d4f3574e | 234 | CORE_ADDR offset; |
c906108c SS |
235 | enum minimal_symbol_type ms_type; |
236 | /* If sectinfo is nonNULL, it contains section info that should end up | |
237 | filed in the objfile. */ | |
238 | struct stab_section_info *sectinfo = NULL; | |
239 | /* If filesym is nonzero, it points to a file symbol, but we haven't | |
240 | seen any section info for it yet. */ | |
241 | asymbol *filesym = 0; | |
1c9e8358 TT |
242 | /* Name of filesym. This is either a constant string or is saved on |
243 | the objfile's obstack. */ | |
244 | char *filesymname = ""; | |
0a6ddd08 | 245 | struct dbx_symfile_info *dbx = objfile->deprecated_sym_stab_info; |
d4f3574e | 246 | int stripped = (bfd_get_symcount (objfile->obfd) == 0); |
69feea6f | 247 | struct cleanup *back_to = make_cleanup (null_cleanup, NULL); |
c5aa993b | 248 | |
0cc7b392 | 249 | for (i = 0; i < number_of_symbols; i++) |
c906108c | 250 | { |
0cc7b392 DJ |
251 | sym = symbol_table[i]; |
252 | if (sym->name == NULL || *sym->name == '\0') | |
c906108c | 253 | { |
0cc7b392 | 254 | /* Skip names that don't exist (shouldn't happen), or names |
0963b4bd | 255 | that are null strings (may happen). */ |
0cc7b392 DJ |
256 | continue; |
257 | } | |
c906108c | 258 | |
74763737 DJ |
259 | /* Skip "special" symbols, e.g. ARM mapping symbols. These are |
260 | symbols which do not correspond to objects in the symbol table, | |
261 | but have some other target-specific meaning. */ | |
262 | if (bfd_is_target_special_symbol (objfile->obfd, sym)) | |
60c5725c DJ |
263 | { |
264 | if (gdbarch_record_special_symbol_p (gdbarch)) | |
265 | gdbarch_record_special_symbol (gdbarch, objfile, sym); | |
266 | continue; | |
267 | } | |
74763737 | 268 | |
0cc7b392 | 269 | offset = ANOFFSET (objfile->section_offsets, sym->section->index); |
6f610d07 | 270 | if (type == ST_DYNAMIC |
0cc7b392 DJ |
271 | && sym->section == &bfd_und_section |
272 | && (sym->flags & BSF_FUNCTION)) | |
273 | { | |
274 | struct minimal_symbol *msym; | |
02c75f72 UW |
275 | bfd *abfd = objfile->obfd; |
276 | asection *sect; | |
0cc7b392 DJ |
277 | |
278 | /* Symbol is a reference to a function defined in | |
279 | a shared library. | |
280 | If its value is non zero then it is usually the address | |
281 | of the corresponding entry in the procedure linkage table, | |
282 | plus the desired section offset. | |
283 | If its value is zero then the dynamic linker has to resolve | |
0963b4bd | 284 | the symbol. We are unable to find any meaningful address |
0cc7b392 DJ |
285 | for this symbol in the executable file, so we skip it. */ |
286 | symaddr = sym->value; | |
287 | if (symaddr == 0) | |
288 | continue; | |
02c75f72 UW |
289 | |
290 | /* sym->section is the undefined section. However, we want to | |
291 | record the section where the PLT stub resides with the | |
292 | minimal symbol. Search the section table for the one that | |
293 | covers the stub's address. */ | |
294 | for (sect = abfd->sections; sect != NULL; sect = sect->next) | |
295 | { | |
296 | if ((bfd_get_section_flags (abfd, sect) & SEC_ALLOC) == 0) | |
297 | continue; | |
298 | ||
299 | if (symaddr >= bfd_get_section_vma (abfd, sect) | |
300 | && symaddr < bfd_get_section_vma (abfd, sect) | |
301 | + bfd_get_section_size (sect)) | |
302 | break; | |
303 | } | |
304 | if (!sect) | |
305 | continue; | |
306 | ||
307 | symaddr += ANOFFSET (objfile->section_offsets, sect->index); | |
308 | ||
0cc7b392 | 309 | msym = record_minimal_symbol |
04a679b8 TT |
310 | (sym->name, strlen (sym->name), copy_names, |
311 | symaddr, mst_solib_trampoline, sect, objfile); | |
0cc7b392 DJ |
312 | if (msym != NULL) |
313 | msym->filename = filesymname; | |
0cc7b392 DJ |
314 | continue; |
315 | } | |
c906108c | 316 | |
0cc7b392 DJ |
317 | /* If it is a nonstripped executable, do not enter dynamic |
318 | symbols, as the dynamic symbol table is usually a subset | |
319 | of the main symbol table. */ | |
6f610d07 | 320 | if (type == ST_DYNAMIC && !stripped) |
0cc7b392 DJ |
321 | continue; |
322 | if (sym->flags & BSF_FILE) | |
323 | { | |
324 | /* STT_FILE debugging symbol that helps stabs-in-elf debugging. | |
325 | Chain any old one onto the objfile; remember new sym. */ | |
326 | if (sectinfo != NULL) | |
c906108c | 327 | { |
0cc7b392 DJ |
328 | sectinfo->next = dbx->stab_section_info; |
329 | dbx->stab_section_info = sectinfo; | |
330 | sectinfo = NULL; | |
331 | } | |
332 | filesym = sym; | |
0cc7b392 DJ |
333 | filesymname = |
334 | obsavestring ((char *) filesym->name, strlen (filesym->name), | |
335 | &objfile->objfile_obstack); | |
0cc7b392 DJ |
336 | } |
337 | else if (sym->flags & BSF_SECTION_SYM) | |
338 | continue; | |
339 | else if (sym->flags & (BSF_GLOBAL | BSF_LOCAL | BSF_WEAK)) | |
340 | { | |
341 | struct minimal_symbol *msym; | |
342 | ||
343 | /* Select global/local/weak symbols. Note that bfd puts abs | |
344 | symbols in their own section, so all symbols we are | |
0963b4bd MS |
345 | interested in will have a section. */ |
346 | /* Bfd symbols are section relative. */ | |
0cc7b392 | 347 | symaddr = sym->value + sym->section->vma; |
45148c2e UW |
348 | /* Relocate all non-absolute and non-TLS symbols by the |
349 | section offset. */ | |
350 | if (sym->section != &bfd_abs_section | |
351 | && !(sym->section->flags & SEC_THREAD_LOCAL)) | |
0cc7b392 DJ |
352 | { |
353 | symaddr += offset; | |
c906108c | 354 | } |
0cc7b392 DJ |
355 | /* For non-absolute symbols, use the type of the section |
356 | they are relative to, to intuit text/data. Bfd provides | |
0963b4bd | 357 | no way of figuring this out for absolute symbols. */ |
0cc7b392 | 358 | if (sym->section == &bfd_abs_section) |
c906108c | 359 | { |
0cc7b392 DJ |
360 | /* This is a hack to get the minimal symbol type |
361 | right for Irix 5, which has absolute addresses | |
6f610d07 UW |
362 | with special section indices for dynamic symbols. |
363 | ||
364 | NOTE: uweigand-20071112: Synthetic symbols do not | |
365 | have an ELF-private part, so do not touch those. */ | |
4fbb74a6 | 366 | unsigned int shndx = type == ST_SYNTHETIC ? 0 : |
0cc7b392 DJ |
367 | ((elf_symbol_type *) sym)->internal_elf_sym.st_shndx; |
368 | ||
369 | switch (shndx) | |
c906108c | 370 | { |
0cc7b392 DJ |
371 | case SHN_MIPS_TEXT: |
372 | ms_type = mst_text; | |
373 | break; | |
374 | case SHN_MIPS_DATA: | |
375 | ms_type = mst_data; | |
376 | break; | |
377 | case SHN_MIPS_ACOMMON: | |
378 | ms_type = mst_bss; | |
379 | break; | |
380 | default: | |
381 | ms_type = mst_abs; | |
382 | } | |
383 | ||
384 | /* If it is an Irix dynamic symbol, skip section name | |
0963b4bd | 385 | symbols, relocate all others by section offset. */ |
0cc7b392 DJ |
386 | if (ms_type != mst_abs) |
387 | { | |
388 | if (sym->name[0] == '.') | |
389 | continue; | |
d4f3574e | 390 | symaddr += offset; |
c906108c | 391 | } |
0cc7b392 DJ |
392 | } |
393 | else if (sym->section->flags & SEC_CODE) | |
394 | { | |
08232497 | 395 | if (sym->flags & (BSF_GLOBAL | BSF_WEAK)) |
c906108c | 396 | { |
0cc7b392 DJ |
397 | ms_type = mst_text; |
398 | } | |
399 | else if ((sym->name[0] == '.' && sym->name[1] == 'L') | |
400 | || ((sym->flags & BSF_LOCAL) | |
401 | && sym->name[0] == '$' | |
402 | && sym->name[1] == 'L')) | |
403 | /* Looks like a compiler-generated label. Skip | |
404 | it. The assembler should be skipping these (to | |
405 | keep executables small), but apparently with | |
406 | gcc on the (deleted) delta m88k SVR4, it loses. | |
407 | So to have us check too should be harmless (but | |
408 | I encourage people to fix this in the assembler | |
409 | instead of adding checks here). */ | |
410 | continue; | |
411 | else | |
412 | { | |
413 | ms_type = mst_file_text; | |
c906108c | 414 | } |
0cc7b392 DJ |
415 | } |
416 | else if (sym->section->flags & SEC_ALLOC) | |
417 | { | |
418 | if (sym->flags & (BSF_GLOBAL | BSF_WEAK)) | |
c906108c | 419 | { |
0cc7b392 | 420 | if (sym->section->flags & SEC_LOAD) |
c906108c | 421 | { |
0cc7b392 | 422 | ms_type = mst_data; |
c906108c | 423 | } |
c906108c SS |
424 | else |
425 | { | |
0cc7b392 | 426 | ms_type = mst_bss; |
c906108c SS |
427 | } |
428 | } | |
0cc7b392 | 429 | else if (sym->flags & BSF_LOCAL) |
c906108c | 430 | { |
0cc7b392 DJ |
431 | /* Named Local variable in a Data section. |
432 | Check its name for stabs-in-elf. */ | |
433 | int special_local_sect; | |
d7f9d729 | 434 | |
0cc7b392 DJ |
435 | if (strcmp ("Bbss.bss", sym->name) == 0) |
436 | special_local_sect = SECT_OFF_BSS (objfile); | |
437 | else if (strcmp ("Ddata.data", sym->name) == 0) | |
438 | special_local_sect = SECT_OFF_DATA (objfile); | |
439 | else if (strcmp ("Drodata.rodata", sym->name) == 0) | |
440 | special_local_sect = SECT_OFF_RODATA (objfile); | |
441 | else | |
442 | special_local_sect = -1; | |
443 | if (special_local_sect >= 0) | |
c906108c | 444 | { |
0cc7b392 DJ |
445 | /* Found a special local symbol. Allocate a |
446 | sectinfo, if needed, and fill it in. */ | |
447 | if (sectinfo == NULL) | |
c906108c | 448 | { |
0cc7b392 DJ |
449 | int max_index; |
450 | size_t size; | |
451 | ||
25c2f6ab PP |
452 | max_index = SECT_OFF_BSS (objfile); |
453 | if (objfile->sect_index_data > max_index) | |
454 | max_index = objfile->sect_index_data; | |
455 | if (objfile->sect_index_rodata > max_index) | |
456 | max_index = objfile->sect_index_rodata; | |
0cc7b392 DJ |
457 | |
458 | /* max_index is the largest index we'll | |
459 | use into this array, so we must | |
460 | allocate max_index+1 elements for it. | |
461 | However, 'struct stab_section_info' | |
462 | already includes one element, so we | |
463 | need to allocate max_index aadditional | |
464 | elements. */ | |
465 | size = (sizeof (struct stab_section_info) | |
c05d19c5 | 466 | + (sizeof (CORE_ADDR) * max_index)); |
0cc7b392 DJ |
467 | sectinfo = (struct stab_section_info *) |
468 | xmalloc (size); | |
69feea6f | 469 | make_cleanup (xfree, sectinfo); |
0cc7b392 DJ |
470 | memset (sectinfo, 0, size); |
471 | sectinfo->num_sections = max_index; | |
472 | if (filesym == NULL) | |
c906108c | 473 | { |
0cc7b392 | 474 | complaint (&symfile_complaints, |
3e43a32a MS |
475 | _("elf/stab section information %s " |
476 | "without a preceding file symbol"), | |
0cc7b392 DJ |
477 | sym->name); |
478 | } | |
479 | else | |
480 | { | |
481 | sectinfo->filename = | |
482 | (char *) filesym->name; | |
c906108c | 483 | } |
c906108c | 484 | } |
0cc7b392 DJ |
485 | if (sectinfo->sections[special_local_sect] != 0) |
486 | complaint (&symfile_complaints, | |
3e43a32a MS |
487 | _("duplicated elf/stab section " |
488 | "information for %s"), | |
0cc7b392 DJ |
489 | sectinfo->filename); |
490 | /* BFD symbols are section relative. */ | |
491 | symaddr = sym->value + sym->section->vma; | |
492 | /* Relocate non-absolute symbols by the | |
493 | section offset. */ | |
494 | if (sym->section != &bfd_abs_section) | |
495 | symaddr += offset; | |
496 | sectinfo->sections[special_local_sect] = symaddr; | |
497 | /* The special local symbols don't go in the | |
498 | minimal symbol table, so ignore this one. */ | |
499 | continue; | |
500 | } | |
501 | /* Not a special stabs-in-elf symbol, do regular | |
502 | symbol processing. */ | |
503 | if (sym->section->flags & SEC_LOAD) | |
504 | { | |
505 | ms_type = mst_file_data; | |
c906108c SS |
506 | } |
507 | else | |
508 | { | |
0cc7b392 | 509 | ms_type = mst_file_bss; |
c906108c SS |
510 | } |
511 | } | |
512 | else | |
513 | { | |
0cc7b392 | 514 | ms_type = mst_unknown; |
c906108c | 515 | } |
0cc7b392 DJ |
516 | } |
517 | else | |
518 | { | |
519 | /* FIXME: Solaris2 shared libraries include lots of | |
520 | odd "absolute" and "undefined" symbols, that play | |
521 | hob with actions like finding what function the PC | |
522 | is in. Ignore them if they aren't text, data, or bss. */ | |
523 | /* ms_type = mst_unknown; */ | |
0963b4bd | 524 | continue; /* Skip this symbol. */ |
0cc7b392 DJ |
525 | } |
526 | msym = record_minimal_symbol | |
04a679b8 | 527 | (sym->name, strlen (sym->name), copy_names, symaddr, |
0cc7b392 | 528 | ms_type, sym->section, objfile); |
6f610d07 | 529 | |
0cc7b392 DJ |
530 | if (msym) |
531 | { | |
532 | /* Pass symbol size field in via BFD. FIXME!!! */ | |
6f610d07 UW |
533 | elf_symbol_type *elf_sym; |
534 | ||
535 | /* NOTE: uweigand-20071112: A synthetic symbol does not have an | |
536 | ELF-private part. However, in some cases (e.g. synthetic | |
537 | 'dot' symbols on ppc64) the udata.p entry is set to point back | |
538 | to the original ELF symbol it was derived from. Get the size | |
539 | from that symbol. */ | |
540 | if (type != ST_SYNTHETIC) | |
541 | elf_sym = (elf_symbol_type *) sym; | |
542 | else | |
543 | elf_sym = (elf_symbol_type *) sym->udata.p; | |
544 | ||
545 | if (elf_sym) | |
546 | MSYMBOL_SIZE(msym) = elf_sym->internal_elf_sym.st_size; | |
a103a963 DJ |
547 | |
548 | msym->filename = filesymname; | |
549 | gdbarch_elf_make_msymbol_special (gdbarch, sym, msym); | |
0cc7b392 | 550 | } |
2eaf8d2a DJ |
551 | |
552 | /* For @plt symbols, also record a trampoline to the | |
553 | destination symbol. The @plt symbol will be used in | |
554 | disassembly, and the trampoline will be used when we are | |
555 | trying to find the target. */ | |
556 | if (msym && ms_type == mst_text && type == ST_SYNTHETIC) | |
557 | { | |
558 | int len = strlen (sym->name); | |
559 | ||
560 | if (len > 4 && strcmp (sym->name + len - 4, "@plt") == 0) | |
561 | { | |
2eaf8d2a DJ |
562 | struct minimal_symbol *mtramp; |
563 | ||
04a679b8 TT |
564 | mtramp = record_minimal_symbol (sym->name, len - 4, 1, |
565 | symaddr, | |
2eaf8d2a DJ |
566 | mst_solib_trampoline, |
567 | sym->section, objfile); | |
568 | if (mtramp) | |
569 | { | |
570 | MSYMBOL_SIZE (mtramp) = MSYMBOL_SIZE (msym); | |
571 | mtramp->filename = filesymname; | |
572 | gdbarch_elf_make_msymbol_special (gdbarch, sym, mtramp); | |
573 | } | |
574 | } | |
575 | } | |
c906108c | 576 | } |
c906108c | 577 | } |
69feea6f | 578 | do_cleanups (back_to); |
c906108c SS |
579 | } |
580 | ||
874f5765 TG |
581 | struct build_id |
582 | { | |
583 | size_t size; | |
584 | gdb_byte data[1]; | |
585 | }; | |
586 | ||
587 | /* Locate NT_GNU_BUILD_ID from ABFD and return its content. */ | |
588 | ||
589 | static struct build_id * | |
590 | build_id_bfd_get (bfd *abfd) | |
591 | { | |
592 | struct build_id *retval; | |
593 | ||
594 | if (!bfd_check_format (abfd, bfd_object) | |
595 | || bfd_get_flavour (abfd) != bfd_target_elf_flavour | |
596 | || elf_tdata (abfd)->build_id == NULL) | |
597 | return NULL; | |
598 | ||
599 | retval = xmalloc (sizeof *retval - 1 + elf_tdata (abfd)->build_id_size); | |
600 | retval->size = elf_tdata (abfd)->build_id_size; | |
601 | memcpy (retval->data, elf_tdata (abfd)->build_id, retval->size); | |
602 | ||
603 | return retval; | |
604 | } | |
605 | ||
606 | /* Return if FILENAME has NT_GNU_BUILD_ID matching the CHECK value. */ | |
607 | ||
608 | static int | |
609 | build_id_verify (const char *filename, struct build_id *check) | |
610 | { | |
611 | bfd *abfd; | |
612 | struct build_id *found = NULL; | |
613 | int retval = 0; | |
614 | ||
615 | /* We expect to be silent on the non-existing files. */ | |
616 | abfd = bfd_open_maybe_remote (filename); | |
617 | if (abfd == NULL) | |
618 | return 0; | |
619 | ||
620 | found = build_id_bfd_get (abfd); | |
621 | ||
622 | if (found == NULL) | |
623 | warning (_("File \"%s\" has no build-id, file skipped"), filename); | |
624 | else if (found->size != check->size | |
625 | || memcmp (found->data, check->data, found->size) != 0) | |
3e43a32a MS |
626 | warning (_("File \"%s\" has a different build-id, file skipped"), |
627 | filename); | |
874f5765 TG |
628 | else |
629 | retval = 1; | |
630 | ||
516ba659 | 631 | gdb_bfd_close_or_warn (abfd); |
874f5765 TG |
632 | |
633 | xfree (found); | |
634 | ||
635 | return retval; | |
636 | } | |
637 | ||
638 | static char * | |
639 | build_id_to_debug_filename (struct build_id *build_id) | |
640 | { | |
641 | char *link, *debugdir, *retval = NULL; | |
642 | ||
643 | /* DEBUG_FILE_DIRECTORY/.build-id/ab/cdef */ | |
644 | link = alloca (strlen (debug_file_directory) + (sizeof "/.build-id/" - 1) + 1 | |
645 | + 2 * build_id->size + (sizeof ".debug" - 1) + 1); | |
646 | ||
647 | /* Keep backward compatibility so that DEBUG_FILE_DIRECTORY being "" will | |
648 | cause "/.build-id/..." lookups. */ | |
649 | ||
650 | debugdir = debug_file_directory; | |
651 | do | |
652 | { | |
653 | char *s, *debugdir_end; | |
654 | gdb_byte *data = build_id->data; | |
655 | size_t size = build_id->size; | |
656 | ||
657 | while (*debugdir == DIRNAME_SEPARATOR) | |
658 | debugdir++; | |
659 | ||
660 | debugdir_end = strchr (debugdir, DIRNAME_SEPARATOR); | |
661 | if (debugdir_end == NULL) | |
662 | debugdir_end = &debugdir[strlen (debugdir)]; | |
663 | ||
664 | memcpy (link, debugdir, debugdir_end - debugdir); | |
665 | s = &link[debugdir_end - debugdir]; | |
666 | s += sprintf (s, "/.build-id/"); | |
667 | if (size > 0) | |
668 | { | |
669 | size--; | |
670 | s += sprintf (s, "%02x", (unsigned) *data++); | |
671 | } | |
672 | if (size > 0) | |
673 | *s++ = '/'; | |
674 | while (size-- > 0) | |
675 | s += sprintf (s, "%02x", (unsigned) *data++); | |
676 | strcpy (s, ".debug"); | |
677 | ||
678 | /* lrealpath() is expensive even for the usually non-existent files. */ | |
679 | if (access (link, F_OK) == 0) | |
680 | retval = lrealpath (link); | |
681 | ||
682 | if (retval != NULL && !build_id_verify (retval, build_id)) | |
683 | { | |
684 | xfree (retval); | |
685 | retval = NULL; | |
686 | } | |
687 | ||
688 | if (retval != NULL) | |
689 | break; | |
690 | ||
691 | debugdir = debugdir_end; | |
692 | } | |
693 | while (*debugdir != 0); | |
694 | ||
695 | return retval; | |
696 | } | |
697 | ||
698 | static char * | |
699 | find_separate_debug_file_by_buildid (struct objfile *objfile) | |
700 | { | |
874f5765 TG |
701 | struct build_id *build_id; |
702 | ||
703 | build_id = build_id_bfd_get (objfile->obfd); | |
704 | if (build_id != NULL) | |
705 | { | |
706 | char *build_id_name; | |
707 | ||
708 | build_id_name = build_id_to_debug_filename (build_id); | |
709 | xfree (build_id); | |
710 | /* Prevent looping on a stripped .debug file. */ | |
0ba1096a KT |
711 | if (build_id_name != NULL |
712 | && filename_cmp (build_id_name, objfile->name) == 0) | |
874f5765 TG |
713 | { |
714 | warning (_("\"%s\": separate debug info file has no debug info"), | |
715 | build_id_name); | |
716 | xfree (build_id_name); | |
717 | } | |
718 | else if (build_id_name != NULL) | |
719 | return build_id_name; | |
720 | } | |
721 | return NULL; | |
722 | } | |
723 | ||
c906108c SS |
724 | /* Scan and build partial symbols for a symbol file. |
725 | We have been initialized by a call to elf_symfile_init, which | |
726 | currently does nothing. | |
727 | ||
728 | SECTION_OFFSETS is a set of offsets to apply to relocate the symbols | |
729 | in each section. We simplify it down to a single offset for all | |
730 | symbols. FIXME. | |
731 | ||
c906108c SS |
732 | This function only does the minimum work necessary for letting the |
733 | user "name" things symbolically; it does not read the entire symtab. | |
734 | Instead, it reads the external and static symbols and puts them in partial | |
735 | symbol tables. When more extensive information is requested of a | |
736 | file, the corresponding partial symbol table is mutated into a full | |
737 | fledged symbol table by going back and reading the symbols | |
738 | for real. | |
739 | ||
740 | We look for sections with specific names, to tell us what debug | |
741 | format to look for: FIXME!!! | |
742 | ||
c906108c SS |
743 | elfstab_build_psymtabs() handles STABS symbols; |
744 | mdebug_build_psymtabs() handles ECOFF debugging information. | |
745 | ||
746 | Note that ELF files have a "minimal" symbol table, which looks a lot | |
747 | like a COFF symbol table, but has only the minimal information necessary | |
748 | for linking. We process this also, and use the information to | |
749 | build gdb's minimal symbol table. This gives us some minimal debugging | |
750 | capability even for files compiled without -g. */ | |
751 | ||
752 | static void | |
f4352531 | 753 | elf_symfile_read (struct objfile *objfile, int symfile_flags) |
c906108c SS |
754 | { |
755 | bfd *abfd = objfile->obfd; | |
756 | struct elfinfo ei; | |
757 | struct cleanup *back_to; | |
62553543 EZ |
758 | long symcount = 0, dynsymcount = 0, synthcount, storage_needed; |
759 | asymbol **symbol_table = NULL, **dyn_symbol_table = NULL; | |
760 | asymbol *synthsyms; | |
c906108c SS |
761 | |
762 | init_minimal_symbol_collection (); | |
56e290f4 | 763 | back_to = make_cleanup_discard_minimal_symbols (); |
c906108c SS |
764 | |
765 | memset ((char *) &ei, 0, sizeof (ei)); | |
766 | ||
0963b4bd | 767 | /* Allocate struct to keep track of the symfile. */ |
0a6ddd08 | 768 | objfile->deprecated_sym_stab_info = (struct dbx_symfile_info *) |
7936743b | 769 | xmalloc (sizeof (struct dbx_symfile_info)); |
3e43a32a MS |
770 | memset ((char *) objfile->deprecated_sym_stab_info, |
771 | 0, sizeof (struct dbx_symfile_info)); | |
12b9c64f | 772 | make_cleanup (free_elfinfo, (void *) objfile); |
c906108c | 773 | |
3e43a32a MS |
774 | /* Process the normal ELF symbol table first. This may write some |
775 | chain of info into the dbx_symfile_info in | |
776 | objfile->deprecated_sym_stab_info, which can later be used by | |
777 | elfstab_offset_sections. */ | |
c906108c | 778 | |
62553543 EZ |
779 | storage_needed = bfd_get_symtab_upper_bound (objfile->obfd); |
780 | if (storage_needed < 0) | |
3e43a32a MS |
781 | error (_("Can't read symbols from %s: %s"), |
782 | bfd_get_filename (objfile->obfd), | |
62553543 EZ |
783 | bfd_errmsg (bfd_get_error ())); |
784 | ||
785 | if (storage_needed > 0) | |
786 | { | |
787 | symbol_table = (asymbol **) xmalloc (storage_needed); | |
788 | make_cleanup (xfree, symbol_table); | |
789 | symcount = bfd_canonicalize_symtab (objfile->obfd, symbol_table); | |
790 | ||
791 | if (symcount < 0) | |
3e43a32a MS |
792 | error (_("Can't read symbols from %s: %s"), |
793 | bfd_get_filename (objfile->obfd), | |
62553543 EZ |
794 | bfd_errmsg (bfd_get_error ())); |
795 | ||
04a679b8 | 796 | elf_symtab_read (objfile, ST_REGULAR, symcount, symbol_table, 0); |
62553543 | 797 | } |
c906108c SS |
798 | |
799 | /* Add the dynamic symbols. */ | |
800 | ||
62553543 EZ |
801 | storage_needed = bfd_get_dynamic_symtab_upper_bound (objfile->obfd); |
802 | ||
803 | if (storage_needed > 0) | |
804 | { | |
3f1eff0a JK |
805 | /* Memory gets permanently referenced from ABFD after |
806 | bfd_get_synthetic_symtab so it must not get freed before ABFD gets. | |
807 | It happens only in the case when elf_slurp_reloc_table sees | |
808 | asection->relocation NULL. Determining which section is asection is | |
809 | done by _bfd_elf_get_synthetic_symtab which is all a bfd | |
810 | implementation detail, though. */ | |
811 | ||
812 | dyn_symbol_table = bfd_alloc (abfd, storage_needed); | |
62553543 EZ |
813 | dynsymcount = bfd_canonicalize_dynamic_symtab (objfile->obfd, |
814 | dyn_symbol_table); | |
815 | ||
816 | if (dynsymcount < 0) | |
3e43a32a MS |
817 | error (_("Can't read symbols from %s: %s"), |
818 | bfd_get_filename (objfile->obfd), | |
62553543 EZ |
819 | bfd_errmsg (bfd_get_error ())); |
820 | ||
04a679b8 | 821 | elf_symtab_read (objfile, ST_DYNAMIC, dynsymcount, dyn_symbol_table, 0); |
62553543 EZ |
822 | } |
823 | ||
824 | /* Add synthetic symbols - for instance, names for any PLT entries. */ | |
825 | ||
826 | synthcount = bfd_get_synthetic_symtab (abfd, symcount, symbol_table, | |
827 | dynsymcount, dyn_symbol_table, | |
828 | &synthsyms); | |
829 | if (synthcount > 0) | |
830 | { | |
831 | asymbol **synth_symbol_table; | |
832 | long i; | |
833 | ||
834 | make_cleanup (xfree, synthsyms); | |
835 | synth_symbol_table = xmalloc (sizeof (asymbol *) * synthcount); | |
836 | for (i = 0; i < synthcount; i++) | |
9f20e3da | 837 | synth_symbol_table[i] = synthsyms + i; |
62553543 | 838 | make_cleanup (xfree, synth_symbol_table); |
3e43a32a MS |
839 | elf_symtab_read (objfile, ST_SYNTHETIC, synthcount, |
840 | synth_symbol_table, 1); | |
62553543 | 841 | } |
c906108c | 842 | |
7134143f DJ |
843 | /* Install any minimal symbols that have been collected as the current |
844 | minimal symbols for this objfile. The debug readers below this point | |
845 | should not generate new minimal symbols; if they do it's their | |
846 | responsibility to install them. "mdebug" appears to be the only one | |
847 | which will do this. */ | |
848 | ||
849 | install_minimal_symbols (objfile); | |
850 | do_cleanups (back_to); | |
851 | ||
c906108c | 852 | /* Now process debugging information, which is contained in |
0963b4bd | 853 | special ELF sections. */ |
c906108c | 854 | |
0963b4bd | 855 | /* We first have to find them... */ |
12b9c64f | 856 | bfd_map_over_sections (abfd, elf_locate_sections, (void *) & ei); |
c906108c SS |
857 | |
858 | /* ELF debugging information is inserted into the psymtab in the | |
859 | order of least informative first - most informative last. Since | |
860 | the psymtab table is searched `most recent insertion first' this | |
861 | increases the probability that more detailed debug information | |
862 | for a section is found. | |
863 | ||
864 | For instance, an object file might contain both .mdebug (XCOFF) | |
865 | and .debug_info (DWARF2) sections then .mdebug is inserted first | |
866 | (searched last) and DWARF2 is inserted last (searched first). If | |
867 | we don't do this then the XCOFF info is found first - for code in | |
0963b4bd | 868 | an included file XCOFF info is useless. */ |
c906108c SS |
869 | |
870 | if (ei.mdebugsect) | |
871 | { | |
872 | const struct ecoff_debug_swap *swap; | |
873 | ||
874 | /* .mdebug section, presumably holding ECOFF debugging | |
c5aa993b | 875 | information. */ |
c906108c SS |
876 | swap = get_elf_backend_data (abfd)->elf_backend_ecoff_debug_swap; |
877 | if (swap) | |
d4f3574e | 878 | elfmdebug_build_psymtabs (objfile, swap, ei.mdebugsect); |
c906108c SS |
879 | } |
880 | if (ei.stabsect) | |
881 | { | |
882 | asection *str_sect; | |
883 | ||
884 | /* Stab sections have an associated string table that looks like | |
c5aa993b | 885 | a separate section. */ |
c906108c SS |
886 | str_sect = bfd_get_section_by_name (abfd, ".stabstr"); |
887 | ||
888 | /* FIXME should probably warn about a stab section without a stabstr. */ | |
889 | if (str_sect) | |
890 | elfstab_build_psymtabs (objfile, | |
086df311 | 891 | ei.stabsect, |
c906108c SS |
892 | str_sect->filepos, |
893 | bfd_section_size (abfd, str_sect)); | |
894 | } | |
9291a0cd | 895 | |
b11896a5 TT |
896 | if (dwarf2_has_info (objfile)) |
897 | { | |
898 | if (dwarf2_initialize_objfile (objfile)) | |
899 | objfile->sf = &elf_sym_fns_gdb_index; | |
900 | else | |
901 | { | |
902 | /* It is ok to do this even if the stabs reader made some | |
903 | partial symbols, because OBJF_PSYMTABS_READ has not been | |
904 | set, and so our lazy reader function will still be called | |
905 | when needed. */ | |
906 | objfile->sf = &elf_sym_fns_lazy_psyms; | |
907 | } | |
908 | } | |
3e43a32a MS |
909 | /* If the file has its own symbol tables it has no separate debug |
910 | info. `.dynsym'/`.symtab' go to MSYMBOLS, `.debug_info' goes to | |
911 | SYMTABS/PSYMTABS. `.gnu_debuglink' may no longer be present with | |
912 | `.note.gnu.build-id'. */ | |
b11896a5 | 913 | else if (!objfile_has_partial_symbols (objfile)) |
9cce227f TG |
914 | { |
915 | char *debugfile; | |
916 | ||
917 | debugfile = find_separate_debug_file_by_buildid (objfile); | |
918 | ||
919 | if (debugfile == NULL) | |
920 | debugfile = find_separate_debug_file_by_debuglink (objfile); | |
921 | ||
922 | if (debugfile) | |
923 | { | |
924 | bfd *abfd = symfile_bfd_open (debugfile); | |
d7f9d729 | 925 | |
9cce227f TG |
926 | symbol_file_add_separate (abfd, symfile_flags, objfile); |
927 | xfree (debugfile); | |
928 | } | |
929 | } | |
c906108c SS |
930 | } |
931 | ||
b11896a5 TT |
932 | /* Callback to lazily read psymtabs. */ |
933 | ||
934 | static void | |
935 | read_psyms (struct objfile *objfile) | |
936 | { | |
937 | if (dwarf2_has_info (objfile)) | |
938 | dwarf2_build_psymtabs (objfile); | |
939 | } | |
940 | ||
0a6ddd08 AC |
941 | /* This cleans up the objfile's deprecated_sym_stab_info pointer, and |
942 | the chain of stab_section_info's, that might be dangling from | |
943 | it. */ | |
c906108c SS |
944 | |
945 | static void | |
12b9c64f | 946 | free_elfinfo (void *objp) |
c906108c | 947 | { |
c5aa993b | 948 | struct objfile *objfile = (struct objfile *) objp; |
0a6ddd08 | 949 | struct dbx_symfile_info *dbxinfo = objfile->deprecated_sym_stab_info; |
c906108c SS |
950 | struct stab_section_info *ssi, *nssi; |
951 | ||
952 | ssi = dbxinfo->stab_section_info; | |
953 | while (ssi) | |
954 | { | |
955 | nssi = ssi->next; | |
2dc74dc1 | 956 | xfree (ssi); |
c906108c SS |
957 | ssi = nssi; |
958 | } | |
959 | ||
960 | dbxinfo->stab_section_info = 0; /* Just say No mo info about this. */ | |
961 | } | |
962 | ||
963 | ||
964 | /* Initialize anything that needs initializing when a completely new symbol | |
965 | file is specified (not just adding some symbols from another file, e.g. a | |
966 | shared library). | |
967 | ||
3e43a32a MS |
968 | We reinitialize buildsym, since we may be reading stabs from an ELF |
969 | file. */ | |
c906108c SS |
970 | |
971 | static void | |
fba45db2 | 972 | elf_new_init (struct objfile *ignore) |
c906108c SS |
973 | { |
974 | stabsread_new_init (); | |
975 | buildsym_new_init (); | |
976 | } | |
977 | ||
978 | /* Perform any local cleanups required when we are done with a particular | |
979 | objfile. I.E, we are in the process of discarding all symbol information | |
980 | for an objfile, freeing up all memory held for it, and unlinking the | |
0963b4bd | 981 | objfile struct from the global list of known objfiles. */ |
c906108c SS |
982 | |
983 | static void | |
fba45db2 | 984 | elf_symfile_finish (struct objfile *objfile) |
c906108c | 985 | { |
0a6ddd08 | 986 | if (objfile->deprecated_sym_stab_info != NULL) |
c906108c | 987 | { |
0a6ddd08 | 988 | xfree (objfile->deprecated_sym_stab_info); |
c906108c | 989 | } |
fe3e1990 DJ |
990 | |
991 | dwarf2_free_objfile (objfile); | |
c906108c SS |
992 | } |
993 | ||
994 | /* ELF specific initialization routine for reading symbols. | |
995 | ||
996 | It is passed a pointer to a struct sym_fns which contains, among other | |
997 | things, the BFD for the file whose symbols are being read, and a slot for | |
998 | a pointer to "private data" which we can fill with goodies. | |
999 | ||
1000 | For now at least, we have nothing in particular to do, so this function is | |
0963b4bd | 1001 | just a stub. */ |
c906108c SS |
1002 | |
1003 | static void | |
fba45db2 | 1004 | elf_symfile_init (struct objfile *objfile) |
c906108c SS |
1005 | { |
1006 | /* ELF objects may be reordered, so set OBJF_REORDERED. If we | |
1007 | find this causes a significant slowdown in gdb then we could | |
1008 | set it in the debug symbol readers only when necessary. */ | |
1009 | objfile->flags |= OBJF_REORDERED; | |
1010 | } | |
1011 | ||
1012 | /* When handling an ELF file that contains Sun STABS debug info, | |
1013 | some of the debug info is relative to the particular chunk of the | |
1014 | section that was generated in its individual .o file. E.g. | |
1015 | offsets to static variables are relative to the start of the data | |
1016 | segment *for that module before linking*. This information is | |
1017 | painfully squirreled away in the ELF symbol table as local symbols | |
1018 | with wierd names. Go get 'em when needed. */ | |
1019 | ||
1020 | void | |
fba45db2 | 1021 | elfstab_offset_sections (struct objfile *objfile, struct partial_symtab *pst) |
c906108c | 1022 | { |
72b9f47f | 1023 | const char *filename = pst->filename; |
0a6ddd08 | 1024 | struct dbx_symfile_info *dbx = objfile->deprecated_sym_stab_info; |
c906108c SS |
1025 | struct stab_section_info *maybe = dbx->stab_section_info; |
1026 | struct stab_section_info *questionable = 0; | |
1027 | int i; | |
c906108c SS |
1028 | |
1029 | /* The ELF symbol info doesn't include path names, so strip the path | |
1030 | (if any) from the psymtab filename. */ | |
0ba1096a | 1031 | filename = lbasename (filename); |
c906108c SS |
1032 | |
1033 | /* FIXME: This linear search could speed up significantly | |
1034 | if it was chained in the right order to match how we search it, | |
0963b4bd | 1035 | and if we unchained when we found a match. */ |
c906108c SS |
1036 | for (; maybe; maybe = maybe->next) |
1037 | { | |
1038 | if (filename[0] == maybe->filename[0] | |
0ba1096a | 1039 | && filename_cmp (filename, maybe->filename) == 0) |
c906108c SS |
1040 | { |
1041 | /* We found a match. But there might be several source files | |
1042 | (from different directories) with the same name. */ | |
1043 | if (0 == maybe->found) | |
1044 | break; | |
c5aa993b | 1045 | questionable = maybe; /* Might use it later. */ |
c906108c SS |
1046 | } |
1047 | } | |
1048 | ||
1049 | if (maybe == 0 && questionable != 0) | |
1050 | { | |
23136709 | 1051 | complaint (&symfile_complaints, |
3e43a32a MS |
1052 | _("elf/stab section information questionable for %s"), |
1053 | filename); | |
c906108c SS |
1054 | maybe = questionable; |
1055 | } | |
1056 | ||
1057 | if (maybe) | |
1058 | { | |
1059 | /* Found it! Allocate a new psymtab struct, and fill it in. */ | |
1060 | maybe->found++; | |
1061 | pst->section_offsets = (struct section_offsets *) | |
8b92e4d5 | 1062 | obstack_alloc (&objfile->objfile_obstack, |
a39a16c4 MM |
1063 | SIZEOF_N_SECTION_OFFSETS (objfile->num_sections)); |
1064 | for (i = 0; i < maybe->num_sections; i++) | |
a4c8257b | 1065 | (pst->section_offsets)->offsets[i] = maybe->sections[i]; |
c906108c SS |
1066 | return; |
1067 | } | |
1068 | ||
1069 | /* We were unable to find any offsets for this file. Complain. */ | |
c5aa993b | 1070 | if (dbx->stab_section_info) /* If there *is* any info, */ |
23136709 | 1071 | complaint (&symfile_complaints, |
e2e0b3e5 | 1072 | _("elf/stab section information missing for %s"), filename); |
c906108c SS |
1073 | } |
1074 | \f | |
1075 | /* Register that we are able to handle ELF object file formats. */ | |
1076 | ||
00b5771c | 1077 | static const struct sym_fns elf_sym_fns = |
c906108c SS |
1078 | { |
1079 | bfd_target_elf_flavour, | |
3e43a32a MS |
1080 | elf_new_init, /* init anything gbl to entire symtab */ |
1081 | elf_symfile_init, /* read initial info, setup for sym_read() */ | |
1082 | elf_symfile_read, /* read a symbol file into symtab */ | |
b11896a5 TT |
1083 | NULL, /* sym_read_psymbols */ |
1084 | elf_symfile_finish, /* finished with file, cleanup */ | |
1085 | default_symfile_offsets, /* Translate ext. to int. relocation */ | |
1086 | elf_symfile_segments, /* Get segment information from a file. */ | |
1087 | NULL, | |
1088 | default_symfile_relocate, /* Relocate a debug section. */ | |
1089 | &psym_functions | |
1090 | }; | |
1091 | ||
1092 | /* The same as elf_sym_fns, but not registered and lazily reads | |
1093 | psymbols. */ | |
1094 | ||
1095 | static const struct sym_fns elf_sym_fns_lazy_psyms = | |
1096 | { | |
1097 | bfd_target_elf_flavour, | |
1098 | elf_new_init, /* init anything gbl to entire symtab */ | |
1099 | elf_symfile_init, /* read initial info, setup for sym_read() */ | |
1100 | elf_symfile_read, /* read a symbol file into symtab */ | |
1101 | read_psyms, /* sym_read_psymbols */ | |
3e43a32a MS |
1102 | elf_symfile_finish, /* finished with file, cleanup */ |
1103 | default_symfile_offsets, /* Translate ext. to int. relocation */ | |
1104 | elf_symfile_segments, /* Get segment information from a file. */ | |
1105 | NULL, | |
1106 | default_symfile_relocate, /* Relocate a debug section. */ | |
00b5771c | 1107 | &psym_functions |
c906108c SS |
1108 | }; |
1109 | ||
9291a0cd TT |
1110 | /* The same as elf_sym_fns, but not registered and uses the |
1111 | DWARF-specific GNU index rather than psymtab. */ | |
00b5771c | 1112 | static const struct sym_fns elf_sym_fns_gdb_index = |
9291a0cd TT |
1113 | { |
1114 | bfd_target_elf_flavour, | |
3e43a32a MS |
1115 | elf_new_init, /* init anything gbl to entire symab */ |
1116 | elf_symfile_init, /* read initial info, setup for sym_red() */ | |
1117 | elf_symfile_read, /* read a symbol file into symtab */ | |
b11896a5 | 1118 | NULL, /* sym_read_psymbols */ |
3e43a32a MS |
1119 | elf_symfile_finish, /* finished with file, cleanup */ |
1120 | default_symfile_offsets, /* Translate ext. to int. relocatin */ | |
1121 | elf_symfile_segments, /* Get segment information from a file. */ | |
1122 | NULL, | |
1123 | default_symfile_relocate, /* Relocate a debug section. */ | |
00b5771c | 1124 | &dwarf2_gdb_index_functions |
9291a0cd TT |
1125 | }; |
1126 | ||
c906108c | 1127 | void |
fba45db2 | 1128 | _initialize_elfread (void) |
c906108c SS |
1129 | { |
1130 | add_symtab_fns (&elf_sym_fns); | |
1131 | } |