Commit | Line | Data |
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c906108c | 1 | /* Read ELF (Executable and Linking Format) object files for GDB. |
1bac305b | 2 | |
6aba47ca DJ |
3 | Copyright (C) 1991, 1992, 1993, 1994, 1995, 1996, 1997, 1998, 1999, 2000, |
4 | 2001, 2002, 2003, 2004, 2005, 2006, 2007 Free Software Foundation, Inc. | |
1bac305b | 5 | |
c906108c SS |
6 | Written by Fred Fish at Cygnus Support. |
7 | ||
c5aa993b | 8 | This file is part of GDB. |
c906108c | 9 | |
c5aa993b JM |
10 | This program is free software; you can redistribute it and/or modify |
11 | it under the terms of the GNU General Public License as published by | |
12 | the Free Software Foundation; either version 2 of the License, or | |
13 | (at your option) any later version. | |
c906108c | 14 | |
c5aa993b JM |
15 | This program is distributed in the hope that it will be useful, |
16 | but WITHOUT ANY WARRANTY; without even the implied warranty of | |
17 | MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the | |
18 | GNU General Public License for more details. | |
c906108c | 19 | |
c5aa993b JM |
20 | You should have received a copy of the GNU General Public License |
21 | along with this program; if not, write to the Free Software | |
197e01b6 EZ |
22 | Foundation, Inc., 51 Franklin Street, Fifth Floor, |
23 | Boston, MA 02110-1301, USA. */ | |
c906108c SS |
24 | |
25 | #include "defs.h" | |
26 | #include "bfd.h" | |
27 | #include "gdb_string.h" | |
28 | #include "elf-bfd.h" | |
29 | #include "elf/mips.h" | |
30 | #include "symtab.h" | |
31 | #include "symfile.h" | |
32 | #include "objfiles.h" | |
33 | #include "buildsym.h" | |
34 | #include "stabsread.h" | |
35 | #include "gdb-stabs.h" | |
36 | #include "complaints.h" | |
37 | #include "demangle.h" | |
38 | ||
a14ed312 | 39 | extern void _initialize_elfread (void); |
392a587b | 40 | |
c906108c | 41 | /* The struct elfinfo is available only during ELF symbol table and |
6426a772 | 42 | psymtab reading. It is destroyed at the completion of psymtab-reading. |
c906108c SS |
43 | It's local to elf_symfile_read. */ |
44 | ||
c5aa993b JM |
45 | struct elfinfo |
46 | { | |
c5aa993b JM |
47 | asection *stabsect; /* Section pointer for .stab section */ |
48 | asection *stabindexsect; /* Section pointer for .stab.index section */ | |
49 | asection *mdebugsect; /* Section pointer for .mdebug section */ | |
50 | }; | |
c906108c | 51 | |
12b9c64f | 52 | static void free_elfinfo (void *); |
c906108c SS |
53 | |
54 | /* We are called once per section from elf_symfile_read. We | |
55 | need to examine each section we are passed, check to see | |
56 | if it is something we are interested in processing, and | |
57 | if so, stash away some access information for the section. | |
58 | ||
59 | For now we recognize the dwarf debug information sections and | |
60 | line number sections from matching their section names. The | |
61 | ELF definition is no real help here since it has no direct | |
62 | knowledge of DWARF (by design, so any debugging format can be | |
63 | used). | |
64 | ||
65 | We also recognize the ".stab" sections used by the Sun compilers | |
66 | released with Solaris 2. | |
67 | ||
68 | FIXME: The section names should not be hardwired strings (what | |
69 | should they be? I don't think most object file formats have enough | |
70 | section flags to specify what kind of debug section it is | |
71 | -kingdon). */ | |
72 | ||
73 | static void | |
12b9c64f | 74 | elf_locate_sections (bfd *ignore_abfd, asection *sectp, void *eip) |
c906108c | 75 | { |
52f0bd74 | 76 | struct elfinfo *ei; |
c906108c SS |
77 | |
78 | ei = (struct elfinfo *) eip; | |
7ce59000 | 79 | if (strcmp (sectp->name, ".stab") == 0) |
c906108c | 80 | { |
c5aa993b | 81 | ei->stabsect = sectp; |
c906108c | 82 | } |
6314a349 | 83 | else if (strcmp (sectp->name, ".stab.index") == 0) |
c906108c | 84 | { |
c5aa993b | 85 | ei->stabindexsect = sectp; |
c906108c | 86 | } |
6314a349 | 87 | else if (strcmp (sectp->name, ".mdebug") == 0) |
c906108c | 88 | { |
c5aa993b | 89 | ei->mdebugsect = sectp; |
c906108c SS |
90 | } |
91 | } | |
92 | ||
c906108c | 93 | static struct minimal_symbol * |
f594e5e9 MC |
94 | record_minimal_symbol (char *name, CORE_ADDR address, |
95 | enum minimal_symbol_type ms_type, | |
96 | asection *bfd_section, struct objfile *objfile) | |
c906108c | 97 | { |
bbeae047 | 98 | if (ms_type == mst_text || ms_type == mst_file_text) |
181c1381 | 99 | address = SMASH_TEXT_ADDRESS (address); |
c906108c SS |
100 | |
101 | return prim_record_minimal_symbol_and_info | |
f594e5e9 | 102 | (name, address, ms_type, NULL, bfd_section->index, bfd_section, objfile); |
c906108c SS |
103 | } |
104 | ||
105 | /* | |
106 | ||
c5aa993b | 107 | LOCAL FUNCTION |
c906108c | 108 | |
c5aa993b | 109 | elf_symtab_read -- read the symbol table of an ELF file |
c906108c | 110 | |
c5aa993b | 111 | SYNOPSIS |
c906108c | 112 | |
62553543 EZ |
113 | void elf_symtab_read (struct objfile *objfile, int dynamic, |
114 | long number_of_symbols, asymbol **symbol_table) | |
c906108c | 115 | |
c5aa993b | 116 | DESCRIPTION |
c906108c | 117 | |
62553543 EZ |
118 | Given an objfile, a symbol table, and a flag indicating whether the |
119 | symbol table contains dynamic symbols, add all the global function | |
120 | and data symbols to the minimal symbol table. | |
c906108c | 121 | |
c5aa993b JM |
122 | In stabs-in-ELF, as implemented by Sun, there are some local symbols |
123 | defined in the ELF symbol table, which can be used to locate | |
124 | the beginnings of sections from each ".o" file that was linked to | |
125 | form the executable objfile. We gather any such info and record it | |
126 | in data structures hung off the objfile's private data. | |
c906108c | 127 | |
c5aa993b | 128 | */ |
c906108c SS |
129 | |
130 | static void | |
62553543 EZ |
131 | elf_symtab_read (struct objfile *objfile, int dynamic, |
132 | long number_of_symbols, asymbol **symbol_table) | |
c906108c SS |
133 | { |
134 | long storage_needed; | |
135 | asymbol *sym; | |
c906108c | 136 | long i; |
c906108c | 137 | CORE_ADDR symaddr; |
d4f3574e | 138 | CORE_ADDR offset; |
c906108c SS |
139 | enum minimal_symbol_type ms_type; |
140 | /* If sectinfo is nonNULL, it contains section info that should end up | |
141 | filed in the objfile. */ | |
142 | struct stab_section_info *sectinfo = NULL; | |
143 | /* If filesym is nonzero, it points to a file symbol, but we haven't | |
144 | seen any section info for it yet. */ | |
145 | asymbol *filesym = 0; | |
146 | #ifdef SOFUN_ADDRESS_MAYBE_MISSING | |
4a146b47 EZ |
147 | /* Name of filesym, as saved on the objfile_obstack. */ |
148 | char *filesymname = obsavestring ("", 0, &objfile->objfile_obstack); | |
c906108c | 149 | #endif |
0a6ddd08 | 150 | struct dbx_symfile_info *dbx = objfile->deprecated_sym_stab_info; |
d4f3574e | 151 | int stripped = (bfd_get_symcount (objfile->obfd) == 0); |
c5aa993b | 152 | |
0cc7b392 | 153 | for (i = 0; i < number_of_symbols; i++) |
c906108c | 154 | { |
0cc7b392 DJ |
155 | sym = symbol_table[i]; |
156 | if (sym->name == NULL || *sym->name == '\0') | |
c906108c | 157 | { |
0cc7b392 DJ |
158 | /* Skip names that don't exist (shouldn't happen), or names |
159 | that are null strings (may happen). */ | |
160 | continue; | |
161 | } | |
c906108c | 162 | |
74763737 DJ |
163 | /* Skip "special" symbols, e.g. ARM mapping symbols. These are |
164 | symbols which do not correspond to objects in the symbol table, | |
165 | but have some other target-specific meaning. */ | |
166 | if (bfd_is_target_special_symbol (objfile->obfd, sym)) | |
167 | continue; | |
168 | ||
0cc7b392 DJ |
169 | offset = ANOFFSET (objfile->section_offsets, sym->section->index); |
170 | if (dynamic | |
171 | && sym->section == &bfd_und_section | |
172 | && (sym->flags & BSF_FUNCTION)) | |
173 | { | |
174 | struct minimal_symbol *msym; | |
175 | ||
176 | /* Symbol is a reference to a function defined in | |
177 | a shared library. | |
178 | If its value is non zero then it is usually the address | |
179 | of the corresponding entry in the procedure linkage table, | |
180 | plus the desired section offset. | |
181 | If its value is zero then the dynamic linker has to resolve | |
182 | the symbol. We are unable to find any meaningful address | |
183 | for this symbol in the executable file, so we skip it. */ | |
184 | symaddr = sym->value; | |
185 | if (symaddr == 0) | |
186 | continue; | |
187 | symaddr += offset; | |
188 | msym = record_minimal_symbol | |
189 | ((char *) sym->name, symaddr, | |
190 | mst_solib_trampoline, sym->section, objfile); | |
c906108c | 191 | #ifdef SOFUN_ADDRESS_MAYBE_MISSING |
0cc7b392 DJ |
192 | if (msym != NULL) |
193 | msym->filename = filesymname; | |
c906108c | 194 | #endif |
0cc7b392 DJ |
195 | continue; |
196 | } | |
c906108c | 197 | |
0cc7b392 DJ |
198 | /* If it is a nonstripped executable, do not enter dynamic |
199 | symbols, as the dynamic symbol table is usually a subset | |
200 | of the main symbol table. */ | |
201 | if (dynamic && !stripped) | |
202 | continue; | |
203 | if (sym->flags & BSF_FILE) | |
204 | { | |
205 | /* STT_FILE debugging symbol that helps stabs-in-elf debugging. | |
206 | Chain any old one onto the objfile; remember new sym. */ | |
207 | if (sectinfo != NULL) | |
c906108c | 208 | { |
0cc7b392 DJ |
209 | sectinfo->next = dbx->stab_section_info; |
210 | dbx->stab_section_info = sectinfo; | |
211 | sectinfo = NULL; | |
212 | } | |
213 | filesym = sym; | |
c906108c | 214 | #ifdef SOFUN_ADDRESS_MAYBE_MISSING |
0cc7b392 DJ |
215 | filesymname = |
216 | obsavestring ((char *) filesym->name, strlen (filesym->name), | |
217 | &objfile->objfile_obstack); | |
c906108c | 218 | #endif |
0cc7b392 DJ |
219 | } |
220 | else if (sym->flags & BSF_SECTION_SYM) | |
221 | continue; | |
222 | else if (sym->flags & (BSF_GLOBAL | BSF_LOCAL | BSF_WEAK)) | |
223 | { | |
224 | struct minimal_symbol *msym; | |
225 | ||
226 | /* Select global/local/weak symbols. Note that bfd puts abs | |
227 | symbols in their own section, so all symbols we are | |
228 | interested in will have a section. */ | |
229 | /* Bfd symbols are section relative. */ | |
230 | symaddr = sym->value + sym->section->vma; | |
231 | /* Relocate all non-absolute symbols by the section offset. */ | |
232 | if (sym->section != &bfd_abs_section) | |
233 | { | |
234 | symaddr += offset; | |
c906108c | 235 | } |
0cc7b392 DJ |
236 | /* For non-absolute symbols, use the type of the section |
237 | they are relative to, to intuit text/data. Bfd provides | |
238 | no way of figuring this out for absolute symbols. */ | |
239 | if (sym->section == &bfd_abs_section) | |
c906108c | 240 | { |
0cc7b392 DJ |
241 | /* This is a hack to get the minimal symbol type |
242 | right for Irix 5, which has absolute addresses | |
243 | with special section indices for dynamic symbols. */ | |
244 | unsigned short shndx = | |
245 | ((elf_symbol_type *) sym)->internal_elf_sym.st_shndx; | |
246 | ||
247 | switch (shndx) | |
c906108c | 248 | { |
0cc7b392 DJ |
249 | case SHN_MIPS_TEXT: |
250 | ms_type = mst_text; | |
251 | break; | |
252 | case SHN_MIPS_DATA: | |
253 | ms_type = mst_data; | |
254 | break; | |
255 | case SHN_MIPS_ACOMMON: | |
256 | ms_type = mst_bss; | |
257 | break; | |
258 | default: | |
259 | ms_type = mst_abs; | |
260 | } | |
261 | ||
262 | /* If it is an Irix dynamic symbol, skip section name | |
263 | symbols, relocate all others by section offset. */ | |
264 | if (ms_type != mst_abs) | |
265 | { | |
266 | if (sym->name[0] == '.') | |
267 | continue; | |
d4f3574e | 268 | symaddr += offset; |
c906108c | 269 | } |
0cc7b392 DJ |
270 | } |
271 | else if (sym->section->flags & SEC_CODE) | |
272 | { | |
08232497 | 273 | if (sym->flags & (BSF_GLOBAL | BSF_WEAK)) |
c906108c | 274 | { |
0cc7b392 DJ |
275 | ms_type = mst_text; |
276 | } | |
277 | else if ((sym->name[0] == '.' && sym->name[1] == 'L') | |
278 | || ((sym->flags & BSF_LOCAL) | |
279 | && sym->name[0] == '$' | |
280 | && sym->name[1] == 'L')) | |
281 | /* Looks like a compiler-generated label. Skip | |
282 | it. The assembler should be skipping these (to | |
283 | keep executables small), but apparently with | |
284 | gcc on the (deleted) delta m88k SVR4, it loses. | |
285 | So to have us check too should be harmless (but | |
286 | I encourage people to fix this in the assembler | |
287 | instead of adding checks here). */ | |
288 | continue; | |
289 | else | |
290 | { | |
291 | ms_type = mst_file_text; | |
c906108c | 292 | } |
0cc7b392 DJ |
293 | } |
294 | else if (sym->section->flags & SEC_ALLOC) | |
295 | { | |
296 | if (sym->flags & (BSF_GLOBAL | BSF_WEAK)) | |
c906108c | 297 | { |
0cc7b392 | 298 | if (sym->section->flags & SEC_LOAD) |
c906108c | 299 | { |
0cc7b392 | 300 | ms_type = mst_data; |
c906108c | 301 | } |
c906108c SS |
302 | else |
303 | { | |
0cc7b392 | 304 | ms_type = mst_bss; |
c906108c SS |
305 | } |
306 | } | |
0cc7b392 | 307 | else if (sym->flags & BSF_LOCAL) |
c906108c | 308 | { |
0cc7b392 DJ |
309 | /* Named Local variable in a Data section. |
310 | Check its name for stabs-in-elf. */ | |
311 | int special_local_sect; | |
312 | if (strcmp ("Bbss.bss", sym->name) == 0) | |
313 | special_local_sect = SECT_OFF_BSS (objfile); | |
314 | else if (strcmp ("Ddata.data", sym->name) == 0) | |
315 | special_local_sect = SECT_OFF_DATA (objfile); | |
316 | else if (strcmp ("Drodata.rodata", sym->name) == 0) | |
317 | special_local_sect = SECT_OFF_RODATA (objfile); | |
318 | else | |
319 | special_local_sect = -1; | |
320 | if (special_local_sect >= 0) | |
c906108c | 321 | { |
0cc7b392 DJ |
322 | /* Found a special local symbol. Allocate a |
323 | sectinfo, if needed, and fill it in. */ | |
324 | if (sectinfo == NULL) | |
c906108c | 325 | { |
0cc7b392 DJ |
326 | int max_index; |
327 | size_t size; | |
328 | ||
329 | max_index | |
330 | = max (SECT_OFF_BSS (objfile), | |
331 | max (SECT_OFF_DATA (objfile), | |
332 | SECT_OFF_RODATA (objfile))); | |
333 | ||
334 | /* max_index is the largest index we'll | |
335 | use into this array, so we must | |
336 | allocate max_index+1 elements for it. | |
337 | However, 'struct stab_section_info' | |
338 | already includes one element, so we | |
339 | need to allocate max_index aadditional | |
340 | elements. */ | |
341 | size = (sizeof (struct stab_section_info) | |
342 | + (sizeof (CORE_ADDR) | |
343 | * max_index)); | |
344 | sectinfo = (struct stab_section_info *) | |
345 | xmalloc (size); | |
346 | memset (sectinfo, 0, size); | |
347 | sectinfo->num_sections = max_index; | |
348 | if (filesym == NULL) | |
c906108c | 349 | { |
0cc7b392 DJ |
350 | complaint (&symfile_complaints, |
351 | _("elf/stab section information %s without a preceding file symbol"), | |
352 | sym->name); | |
353 | } | |
354 | else | |
355 | { | |
356 | sectinfo->filename = | |
357 | (char *) filesym->name; | |
c906108c | 358 | } |
c906108c | 359 | } |
0cc7b392 DJ |
360 | if (sectinfo->sections[special_local_sect] != 0) |
361 | complaint (&symfile_complaints, | |
362 | _("duplicated elf/stab section information for %s"), | |
363 | sectinfo->filename); | |
364 | /* BFD symbols are section relative. */ | |
365 | symaddr = sym->value + sym->section->vma; | |
366 | /* Relocate non-absolute symbols by the | |
367 | section offset. */ | |
368 | if (sym->section != &bfd_abs_section) | |
369 | symaddr += offset; | |
370 | sectinfo->sections[special_local_sect] = symaddr; | |
371 | /* The special local symbols don't go in the | |
372 | minimal symbol table, so ignore this one. */ | |
373 | continue; | |
374 | } | |
375 | /* Not a special stabs-in-elf symbol, do regular | |
376 | symbol processing. */ | |
377 | if (sym->section->flags & SEC_LOAD) | |
378 | { | |
379 | ms_type = mst_file_data; | |
c906108c SS |
380 | } |
381 | else | |
382 | { | |
0cc7b392 | 383 | ms_type = mst_file_bss; |
c906108c SS |
384 | } |
385 | } | |
386 | else | |
387 | { | |
0cc7b392 | 388 | ms_type = mst_unknown; |
c906108c | 389 | } |
0cc7b392 DJ |
390 | } |
391 | else | |
392 | { | |
393 | /* FIXME: Solaris2 shared libraries include lots of | |
394 | odd "absolute" and "undefined" symbols, that play | |
395 | hob with actions like finding what function the PC | |
396 | is in. Ignore them if they aren't text, data, or bss. */ | |
397 | /* ms_type = mst_unknown; */ | |
398 | continue; /* Skip this symbol. */ | |
399 | } | |
400 | msym = record_minimal_symbol | |
401 | ((char *) sym->name, symaddr, | |
402 | ms_type, sym->section, objfile); | |
403 | if (msym) | |
404 | { | |
405 | /* Pass symbol size field in via BFD. FIXME!!! */ | |
406 | unsigned long size = ((elf_symbol_type *) sym)->internal_elf_sym.st_size; | |
407 | MSYMBOL_SIZE(msym) = size; | |
408 | } | |
c906108c | 409 | #ifdef SOFUN_ADDRESS_MAYBE_MISSING |
0cc7b392 DJ |
410 | if (msym != NULL) |
411 | msym->filename = filesymname; | |
c906108c | 412 | #endif |
0cc7b392 | 413 | ELF_MAKE_MSYMBOL_SPECIAL (sym, msym); |
c906108c | 414 | } |
c906108c SS |
415 | } |
416 | } | |
417 | ||
418 | /* Scan and build partial symbols for a symbol file. | |
419 | We have been initialized by a call to elf_symfile_init, which | |
420 | currently does nothing. | |
421 | ||
422 | SECTION_OFFSETS is a set of offsets to apply to relocate the symbols | |
423 | in each section. We simplify it down to a single offset for all | |
424 | symbols. FIXME. | |
425 | ||
426 | MAINLINE is true if we are reading the main symbol | |
427 | table (as opposed to a shared lib or dynamically loaded file). | |
428 | ||
429 | This function only does the minimum work necessary for letting the | |
430 | user "name" things symbolically; it does not read the entire symtab. | |
431 | Instead, it reads the external and static symbols and puts them in partial | |
432 | symbol tables. When more extensive information is requested of a | |
433 | file, the corresponding partial symbol table is mutated into a full | |
434 | fledged symbol table by going back and reading the symbols | |
435 | for real. | |
436 | ||
437 | We look for sections with specific names, to tell us what debug | |
438 | format to look for: FIXME!!! | |
439 | ||
c906108c SS |
440 | elfstab_build_psymtabs() handles STABS symbols; |
441 | mdebug_build_psymtabs() handles ECOFF debugging information. | |
442 | ||
443 | Note that ELF files have a "minimal" symbol table, which looks a lot | |
444 | like a COFF symbol table, but has only the minimal information necessary | |
445 | for linking. We process this also, and use the information to | |
446 | build gdb's minimal symbol table. This gives us some minimal debugging | |
447 | capability even for files compiled without -g. */ | |
448 | ||
449 | static void | |
fba45db2 | 450 | elf_symfile_read (struct objfile *objfile, int mainline) |
c906108c SS |
451 | { |
452 | bfd *abfd = objfile->obfd; | |
453 | struct elfinfo ei; | |
454 | struct cleanup *back_to; | |
455 | CORE_ADDR offset; | |
62553543 EZ |
456 | long symcount = 0, dynsymcount = 0, synthcount, storage_needed; |
457 | asymbol **symbol_table = NULL, **dyn_symbol_table = NULL; | |
458 | asymbol *synthsyms; | |
c906108c SS |
459 | |
460 | init_minimal_symbol_collection (); | |
56e290f4 | 461 | back_to = make_cleanup_discard_minimal_symbols (); |
c906108c SS |
462 | |
463 | memset ((char *) &ei, 0, sizeof (ei)); | |
464 | ||
465 | /* Allocate struct to keep track of the symfile */ | |
0a6ddd08 | 466 | objfile->deprecated_sym_stab_info = (struct dbx_symfile_info *) |
7936743b | 467 | xmalloc (sizeof (struct dbx_symfile_info)); |
0a6ddd08 | 468 | memset ((char *) objfile->deprecated_sym_stab_info, 0, sizeof (struct dbx_symfile_info)); |
12b9c64f | 469 | make_cleanup (free_elfinfo, (void *) objfile); |
c906108c SS |
470 | |
471 | /* Process the normal ELF symbol table first. This may write some | |
0a6ddd08 | 472 | chain of info into the dbx_symfile_info in objfile->deprecated_sym_stab_info, |
c906108c SS |
473 | which can later be used by elfstab_offset_sections. */ |
474 | ||
62553543 EZ |
475 | storage_needed = bfd_get_symtab_upper_bound (objfile->obfd); |
476 | if (storage_needed < 0) | |
477 | error (_("Can't read symbols from %s: %s"), bfd_get_filename (objfile->obfd), | |
478 | bfd_errmsg (bfd_get_error ())); | |
479 | ||
480 | if (storage_needed > 0) | |
481 | { | |
482 | symbol_table = (asymbol **) xmalloc (storage_needed); | |
483 | make_cleanup (xfree, symbol_table); | |
484 | symcount = bfd_canonicalize_symtab (objfile->obfd, symbol_table); | |
485 | ||
486 | if (symcount < 0) | |
487 | error (_("Can't read symbols from %s: %s"), bfd_get_filename (objfile->obfd), | |
488 | bfd_errmsg (bfd_get_error ())); | |
489 | ||
490 | elf_symtab_read (objfile, 0, symcount, symbol_table); | |
491 | } | |
c906108c SS |
492 | |
493 | /* Add the dynamic symbols. */ | |
494 | ||
62553543 EZ |
495 | storage_needed = bfd_get_dynamic_symtab_upper_bound (objfile->obfd); |
496 | ||
497 | if (storage_needed > 0) | |
498 | { | |
499 | dyn_symbol_table = (asymbol **) xmalloc (storage_needed); | |
500 | make_cleanup (xfree, dyn_symbol_table); | |
501 | dynsymcount = bfd_canonicalize_dynamic_symtab (objfile->obfd, | |
502 | dyn_symbol_table); | |
503 | ||
504 | if (dynsymcount < 0) | |
505 | error (_("Can't read symbols from %s: %s"), bfd_get_filename (objfile->obfd), | |
506 | bfd_errmsg (bfd_get_error ())); | |
507 | ||
508 | elf_symtab_read (objfile, 1, dynsymcount, dyn_symbol_table); | |
509 | } | |
510 | ||
511 | /* Add synthetic symbols - for instance, names for any PLT entries. */ | |
512 | ||
513 | synthcount = bfd_get_synthetic_symtab (abfd, symcount, symbol_table, | |
514 | dynsymcount, dyn_symbol_table, | |
515 | &synthsyms); | |
516 | if (synthcount > 0) | |
517 | { | |
518 | asymbol **synth_symbol_table; | |
519 | long i; | |
520 | ||
521 | make_cleanup (xfree, synthsyms); | |
522 | synth_symbol_table = xmalloc (sizeof (asymbol *) * synthcount); | |
523 | for (i = 0; i < synthcount; i++) | |
9f20e3da | 524 | synth_symbol_table[i] = synthsyms + i; |
62553543 EZ |
525 | make_cleanup (xfree, synth_symbol_table); |
526 | elf_symtab_read (objfile, 0, synthcount, synth_symbol_table); | |
527 | } | |
c906108c | 528 | |
7134143f DJ |
529 | /* Install any minimal symbols that have been collected as the current |
530 | minimal symbols for this objfile. The debug readers below this point | |
531 | should not generate new minimal symbols; if they do it's their | |
532 | responsibility to install them. "mdebug" appears to be the only one | |
533 | which will do this. */ | |
534 | ||
535 | install_minimal_symbols (objfile); | |
536 | do_cleanups (back_to); | |
537 | ||
c906108c SS |
538 | /* Now process debugging information, which is contained in |
539 | special ELF sections. */ | |
540 | ||
541 | /* If we are reinitializing, or if we have never loaded syms yet, | |
542 | set table to empty. MAINLINE is cleared so that *_read_psymtab | |
543 | functions do not all also re-initialize the psymbol table. */ | |
544 | if (mainline) | |
545 | { | |
546 | init_psymbol_list (objfile, 0); | |
547 | mainline = 0; | |
548 | } | |
549 | ||
550 | /* We first have to find them... */ | |
12b9c64f | 551 | bfd_map_over_sections (abfd, elf_locate_sections, (void *) & ei); |
c906108c SS |
552 | |
553 | /* ELF debugging information is inserted into the psymtab in the | |
554 | order of least informative first - most informative last. Since | |
555 | the psymtab table is searched `most recent insertion first' this | |
556 | increases the probability that more detailed debug information | |
557 | for a section is found. | |
558 | ||
559 | For instance, an object file might contain both .mdebug (XCOFF) | |
560 | and .debug_info (DWARF2) sections then .mdebug is inserted first | |
561 | (searched last) and DWARF2 is inserted last (searched first). If | |
562 | we don't do this then the XCOFF info is found first - for code in | |
563 | an included file XCOFF info is useless. */ | |
564 | ||
565 | if (ei.mdebugsect) | |
566 | { | |
567 | const struct ecoff_debug_swap *swap; | |
568 | ||
569 | /* .mdebug section, presumably holding ECOFF debugging | |
c5aa993b | 570 | information. */ |
c906108c SS |
571 | swap = get_elf_backend_data (abfd)->elf_backend_ecoff_debug_swap; |
572 | if (swap) | |
d4f3574e | 573 | elfmdebug_build_psymtabs (objfile, swap, ei.mdebugsect); |
c906108c SS |
574 | } |
575 | if (ei.stabsect) | |
576 | { | |
577 | asection *str_sect; | |
578 | ||
579 | /* Stab sections have an associated string table that looks like | |
c5aa993b | 580 | a separate section. */ |
c906108c SS |
581 | str_sect = bfd_get_section_by_name (abfd, ".stabstr"); |
582 | ||
583 | /* FIXME should probably warn about a stab section without a stabstr. */ | |
584 | if (str_sect) | |
585 | elfstab_build_psymtabs (objfile, | |
c906108c | 586 | mainline, |
086df311 | 587 | ei.stabsect, |
c906108c SS |
588 | str_sect->filepos, |
589 | bfd_section_size (abfd, str_sect)); | |
590 | } | |
c5edf76a | 591 | if (dwarf2_has_info (objfile)) |
c906108c SS |
592 | { |
593 | /* DWARF 2 sections */ | |
d4f3574e | 594 | dwarf2_build_psymtabs (objfile, mainline); |
c906108c | 595 | } |
c906108c | 596 | |
625b0b97 AC |
597 | /* FIXME: kettenis/20030504: This still needs to be integrated with |
598 | dwarf2read.c in a better way. */ | |
599 | dwarf2_build_frame_info (objfile); | |
c906108c SS |
600 | } |
601 | ||
0a6ddd08 AC |
602 | /* This cleans up the objfile's deprecated_sym_stab_info pointer, and |
603 | the chain of stab_section_info's, that might be dangling from | |
604 | it. */ | |
c906108c SS |
605 | |
606 | static void | |
12b9c64f | 607 | free_elfinfo (void *objp) |
c906108c | 608 | { |
c5aa993b | 609 | struct objfile *objfile = (struct objfile *) objp; |
0a6ddd08 | 610 | struct dbx_symfile_info *dbxinfo = objfile->deprecated_sym_stab_info; |
c906108c SS |
611 | struct stab_section_info *ssi, *nssi; |
612 | ||
613 | ssi = dbxinfo->stab_section_info; | |
614 | while (ssi) | |
615 | { | |
616 | nssi = ssi->next; | |
2dc74dc1 | 617 | xfree (ssi); |
c906108c SS |
618 | ssi = nssi; |
619 | } | |
620 | ||
621 | dbxinfo->stab_section_info = 0; /* Just say No mo info about this. */ | |
622 | } | |
623 | ||
624 | ||
625 | /* Initialize anything that needs initializing when a completely new symbol | |
626 | file is specified (not just adding some symbols from another file, e.g. a | |
627 | shared library). | |
628 | ||
629 | We reinitialize buildsym, since we may be reading stabs from an ELF file. */ | |
630 | ||
631 | static void | |
fba45db2 | 632 | elf_new_init (struct objfile *ignore) |
c906108c SS |
633 | { |
634 | stabsread_new_init (); | |
635 | buildsym_new_init (); | |
636 | } | |
637 | ||
638 | /* Perform any local cleanups required when we are done with a particular | |
639 | objfile. I.E, we are in the process of discarding all symbol information | |
640 | for an objfile, freeing up all memory held for it, and unlinking the | |
641 | objfile struct from the global list of known objfiles. */ | |
642 | ||
643 | static void | |
fba45db2 | 644 | elf_symfile_finish (struct objfile *objfile) |
c906108c | 645 | { |
0a6ddd08 | 646 | if (objfile->deprecated_sym_stab_info != NULL) |
c906108c | 647 | { |
0a6ddd08 | 648 | xfree (objfile->deprecated_sym_stab_info); |
c906108c SS |
649 | } |
650 | } | |
651 | ||
652 | /* ELF specific initialization routine for reading symbols. | |
653 | ||
654 | It is passed a pointer to a struct sym_fns which contains, among other | |
655 | things, the BFD for the file whose symbols are being read, and a slot for | |
656 | a pointer to "private data" which we can fill with goodies. | |
657 | ||
658 | For now at least, we have nothing in particular to do, so this function is | |
659 | just a stub. */ | |
660 | ||
661 | static void | |
fba45db2 | 662 | elf_symfile_init (struct objfile *objfile) |
c906108c SS |
663 | { |
664 | /* ELF objects may be reordered, so set OBJF_REORDERED. If we | |
665 | find this causes a significant slowdown in gdb then we could | |
666 | set it in the debug symbol readers only when necessary. */ | |
667 | objfile->flags |= OBJF_REORDERED; | |
668 | } | |
669 | ||
670 | /* When handling an ELF file that contains Sun STABS debug info, | |
671 | some of the debug info is relative to the particular chunk of the | |
672 | section that was generated in its individual .o file. E.g. | |
673 | offsets to static variables are relative to the start of the data | |
674 | segment *for that module before linking*. This information is | |
675 | painfully squirreled away in the ELF symbol table as local symbols | |
676 | with wierd names. Go get 'em when needed. */ | |
677 | ||
678 | void | |
fba45db2 | 679 | elfstab_offset_sections (struct objfile *objfile, struct partial_symtab *pst) |
c906108c SS |
680 | { |
681 | char *filename = pst->filename; | |
0a6ddd08 | 682 | struct dbx_symfile_info *dbx = objfile->deprecated_sym_stab_info; |
c906108c SS |
683 | struct stab_section_info *maybe = dbx->stab_section_info; |
684 | struct stab_section_info *questionable = 0; | |
685 | int i; | |
686 | char *p; | |
687 | ||
688 | /* The ELF symbol info doesn't include path names, so strip the path | |
689 | (if any) from the psymtab filename. */ | |
690 | while (0 != (p = strchr (filename, '/'))) | |
c5aa993b | 691 | filename = p + 1; |
c906108c SS |
692 | |
693 | /* FIXME: This linear search could speed up significantly | |
694 | if it was chained in the right order to match how we search it, | |
695 | and if we unchained when we found a match. */ | |
696 | for (; maybe; maybe = maybe->next) | |
697 | { | |
698 | if (filename[0] == maybe->filename[0] | |
6314a349 | 699 | && strcmp (filename, maybe->filename) == 0) |
c906108c SS |
700 | { |
701 | /* We found a match. But there might be several source files | |
702 | (from different directories) with the same name. */ | |
703 | if (0 == maybe->found) | |
704 | break; | |
c5aa993b | 705 | questionable = maybe; /* Might use it later. */ |
c906108c SS |
706 | } |
707 | } | |
708 | ||
709 | if (maybe == 0 && questionable != 0) | |
710 | { | |
23136709 | 711 | complaint (&symfile_complaints, |
e2e0b3e5 | 712 | _("elf/stab section information questionable for %s"), filename); |
c906108c SS |
713 | maybe = questionable; |
714 | } | |
715 | ||
716 | if (maybe) | |
717 | { | |
718 | /* Found it! Allocate a new psymtab struct, and fill it in. */ | |
719 | maybe->found++; | |
720 | pst->section_offsets = (struct section_offsets *) | |
8b92e4d5 | 721 | obstack_alloc (&objfile->objfile_obstack, |
a39a16c4 MM |
722 | SIZEOF_N_SECTION_OFFSETS (objfile->num_sections)); |
723 | for (i = 0; i < maybe->num_sections; i++) | |
a4c8257b | 724 | (pst->section_offsets)->offsets[i] = maybe->sections[i]; |
c906108c SS |
725 | return; |
726 | } | |
727 | ||
728 | /* We were unable to find any offsets for this file. Complain. */ | |
c5aa993b | 729 | if (dbx->stab_section_info) /* If there *is* any info, */ |
23136709 | 730 | complaint (&symfile_complaints, |
e2e0b3e5 | 731 | _("elf/stab section information missing for %s"), filename); |
c906108c SS |
732 | } |
733 | \f | |
734 | /* Register that we are able to handle ELF object file formats. */ | |
735 | ||
736 | static struct sym_fns elf_sym_fns = | |
737 | { | |
738 | bfd_target_elf_flavour, | |
c5aa993b JM |
739 | elf_new_init, /* sym_new_init: init anything gbl to entire symtab */ |
740 | elf_symfile_init, /* sym_init: read initial info, setup for sym_read() */ | |
741 | elf_symfile_read, /* sym_read: read a symbol file into symtab */ | |
742 | elf_symfile_finish, /* sym_finish: finished with file, cleanup */ | |
96baa820 | 743 | default_symfile_offsets, /* sym_offsets: Translate ext. to int. relocation */ |
c5aa993b | 744 | NULL /* next: pointer to next struct sym_fns */ |
c906108c SS |
745 | }; |
746 | ||
747 | void | |
fba45db2 | 748 | _initialize_elfread (void) |
c906108c SS |
749 | { |
750 | add_symtab_fns (&elf_sym_fns); | |
751 | } |