Commit | Line | Data |
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c906108c | 1 | /* Read ELF (Executable and Linking Format) object files for GDB. |
8e65ff28 AC |
2 | Copyright 1991, 92, 93, 94, 95, 96, 1998, 2001 |
3 | Free Software Foundation, Inc. | |
c906108c SS |
4 | Written by Fred Fish at Cygnus Support. |
5 | ||
c5aa993b | 6 | This file is part of GDB. |
c906108c | 7 | |
c5aa993b JM |
8 | This program is free software; you can redistribute it and/or modify |
9 | it under the terms of the GNU General Public License as published by | |
10 | the Free Software Foundation; either version 2 of the License, or | |
11 | (at your option) any later version. | |
c906108c | 12 | |
c5aa993b JM |
13 | This program is distributed in the hope that it will be useful, |
14 | but WITHOUT ANY WARRANTY; without even the implied warranty of | |
15 | MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the | |
16 | GNU General Public License for more details. | |
c906108c | 17 | |
c5aa993b JM |
18 | You should have received a copy of the GNU General Public License |
19 | along with this program; if not, write to the Free Software | |
20 | Foundation, Inc., 59 Temple Place - Suite 330, | |
21 | Boston, MA 02111-1307, USA. */ | |
c906108c SS |
22 | |
23 | #include "defs.h" | |
24 | #include "bfd.h" | |
25 | #include "gdb_string.h" | |
26 | #include "elf-bfd.h" | |
27 | #include "elf/mips.h" | |
28 | #include "symtab.h" | |
29 | #include "symfile.h" | |
30 | #include "objfiles.h" | |
31 | #include "buildsym.h" | |
32 | #include "stabsread.h" | |
33 | #include "gdb-stabs.h" | |
34 | #include "complaints.h" | |
35 | #include "demangle.h" | |
36 | ||
a14ed312 | 37 | extern void _initialize_elfread (void); |
392a587b | 38 | |
c906108c | 39 | /* The struct elfinfo is available only during ELF symbol table and |
6426a772 | 40 | psymtab reading. It is destroyed at the completion of psymtab-reading. |
c906108c SS |
41 | It's local to elf_symfile_read. */ |
42 | ||
c5aa993b JM |
43 | struct elfinfo |
44 | { | |
45 | file_ptr dboffset; /* Offset to dwarf debug section */ | |
46 | unsigned int dbsize; /* Size of dwarf debug section */ | |
47 | file_ptr lnoffset; /* Offset to dwarf line number section */ | |
48 | unsigned int lnsize; /* Size of dwarf line number section */ | |
49 | asection *stabsect; /* Section pointer for .stab section */ | |
50 | asection *stabindexsect; /* Section pointer for .stab.index section */ | |
51 | asection *mdebugsect; /* Section pointer for .mdebug section */ | |
52 | }; | |
c906108c SS |
53 | |
54 | /* Various things we might complain about... */ | |
55 | ||
c5aa993b JM |
56 | struct complaint section_info_complaint = |
57 | {"elf/stab section information %s without a preceding file symbol", 0, 0}; | |
c906108c | 58 | |
c5aa993b JM |
59 | struct complaint section_info_dup_complaint = |
60 | {"duplicated elf/stab section information for %s", 0, 0}; | |
c906108c | 61 | |
c5aa993b JM |
62 | struct complaint stab_info_mismatch_complaint = |
63 | {"elf/stab section information missing for %s", 0, 0}; | |
c906108c | 64 | |
c5aa993b JM |
65 | struct complaint stab_info_questionable_complaint = |
66 | {"elf/stab section information questionable for %s", 0, 0}; | |
c906108c | 67 | |
a14ed312 | 68 | static void elf_symfile_init (struct objfile *); |
c906108c | 69 | |
a14ed312 | 70 | static void elf_new_init (struct objfile *); |
c906108c | 71 | |
a14ed312 | 72 | static void elf_symfile_read (struct objfile *, int); |
c906108c | 73 | |
a14ed312 | 74 | static void elf_symfile_finish (struct objfile *); |
c906108c | 75 | |
a14ed312 | 76 | static void elf_symtab_read (struct objfile *, int); |
c906108c | 77 | |
a14ed312 | 78 | static void free_elfinfo (void *); |
c906108c | 79 | |
a14ed312 KB |
80 | static struct minimal_symbol *record_minimal_symbol_and_info (char *, |
81 | CORE_ADDR, | |
82 | enum | |
83 | minimal_symbol_type, | |
84 | char *, | |
85 | asection * | |
86 | bfd_section, | |
87 | struct objfile | |
88 | *); | |
c906108c | 89 | |
a14ed312 | 90 | static void elf_locate_sections (bfd *, asection *, void *); |
c906108c SS |
91 | |
92 | /* We are called once per section from elf_symfile_read. We | |
93 | need to examine each section we are passed, check to see | |
94 | if it is something we are interested in processing, and | |
95 | if so, stash away some access information for the section. | |
96 | ||
97 | For now we recognize the dwarf debug information sections and | |
98 | line number sections from matching their section names. The | |
99 | ELF definition is no real help here since it has no direct | |
100 | knowledge of DWARF (by design, so any debugging format can be | |
101 | used). | |
102 | ||
103 | We also recognize the ".stab" sections used by the Sun compilers | |
104 | released with Solaris 2. | |
105 | ||
106 | FIXME: The section names should not be hardwired strings (what | |
107 | should they be? I don't think most object file formats have enough | |
108 | section flags to specify what kind of debug section it is | |
109 | -kingdon). */ | |
110 | ||
111 | static void | |
fba45db2 | 112 | elf_locate_sections (bfd *ignore_abfd, asection *sectp, PTR eip) |
c906108c SS |
113 | { |
114 | register struct elfinfo *ei; | |
115 | ||
116 | ei = (struct elfinfo *) eip; | |
c5aa993b | 117 | if (STREQ (sectp->name, ".debug")) |
c906108c | 118 | { |
c5aa993b JM |
119 | ei->dboffset = sectp->filepos; |
120 | ei->dbsize = bfd_get_section_size_before_reloc (sectp); | |
c906108c | 121 | } |
c5aa993b | 122 | else if (STREQ (sectp->name, ".line")) |
c906108c | 123 | { |
c5aa993b JM |
124 | ei->lnoffset = sectp->filepos; |
125 | ei->lnsize = bfd_get_section_size_before_reloc (sectp); | |
c906108c | 126 | } |
c5aa993b | 127 | else if (STREQ (sectp->name, ".stab")) |
c906108c | 128 | { |
c5aa993b | 129 | ei->stabsect = sectp; |
c906108c | 130 | } |
c5aa993b | 131 | else if (STREQ (sectp->name, ".stab.index")) |
c906108c | 132 | { |
c5aa993b | 133 | ei->stabindexsect = sectp; |
c906108c | 134 | } |
c5aa993b | 135 | else if (STREQ (sectp->name, ".mdebug")) |
c906108c | 136 | { |
c5aa993b | 137 | ei->mdebugsect = sectp; |
c906108c SS |
138 | } |
139 | } | |
140 | ||
c5aa993b | 141 | #if 0 /* Currently unused */ |
c906108c SS |
142 | |
143 | char * | |
fba45db2 | 144 | elf_interpreter (bfd *abfd) |
c906108c SS |
145 | { |
146 | sec_ptr interp_sec; | |
147 | unsigned size; | |
148 | char *interp = NULL; | |
149 | ||
150 | interp_sec = bfd_get_section_by_name (abfd, ".interp"); | |
151 | if (interp_sec) | |
152 | { | |
153 | size = bfd_section_size (abfd, interp_sec); | |
154 | interp = alloca (size); | |
c5aa993b | 155 | if (bfd_get_section_contents (abfd, interp_sec, interp, (file_ptr) 0, |
c906108c SS |
156 | size)) |
157 | { | |
158 | interp = savestring (interp, size - 1); | |
159 | } | |
160 | else | |
161 | { | |
162 | interp = NULL; | |
163 | } | |
164 | } | |
165 | return (interp); | |
166 | } | |
167 | ||
168 | #endif | |
169 | ||
170 | static struct minimal_symbol * | |
fba45db2 KB |
171 | record_minimal_symbol_and_info (char *name, CORE_ADDR address, |
172 | enum minimal_symbol_type ms_type, char *info, /* FIXME, is this really char *? */ | |
173 | asection *bfd_section, struct objfile *objfile) | |
c906108c | 174 | { |
c906108c | 175 | #ifdef SMASH_TEXT_ADDRESS |
bbeae047 KB |
176 | if (ms_type == mst_text || ms_type == mst_file_text) |
177 | SMASH_TEXT_ADDRESS (address); | |
c906108c | 178 | #endif |
c906108c SS |
179 | |
180 | return prim_record_minimal_symbol_and_info | |
bbeae047 | 181 | (name, address, ms_type, info, bfd_section->index, bfd_section, objfile); |
c906108c SS |
182 | } |
183 | ||
184 | /* | |
185 | ||
c5aa993b | 186 | LOCAL FUNCTION |
c906108c | 187 | |
c5aa993b | 188 | elf_symtab_read -- read the symbol table of an ELF file |
c906108c | 189 | |
c5aa993b | 190 | SYNOPSIS |
c906108c | 191 | |
d4f3574e | 192 | void elf_symtab_read (struct objfile *objfile, int dynamic) |
c906108c | 193 | |
c5aa993b | 194 | DESCRIPTION |
c906108c | 195 | |
d4f3574e SS |
196 | Given an objfile and a flag that specifies whether or not the objfile |
197 | is for an executable or not (may be shared library for example), add | |
198 | all the global function and data symbols to the minimal symbol table. | |
c906108c | 199 | |
c5aa993b JM |
200 | In stabs-in-ELF, as implemented by Sun, there are some local symbols |
201 | defined in the ELF symbol table, which can be used to locate | |
202 | the beginnings of sections from each ".o" file that was linked to | |
203 | form the executable objfile. We gather any such info and record it | |
204 | in data structures hung off the objfile's private data. | |
c906108c | 205 | |
c5aa993b | 206 | */ |
c906108c SS |
207 | |
208 | static void | |
fba45db2 | 209 | elf_symtab_read (struct objfile *objfile, int dynamic) |
c906108c SS |
210 | { |
211 | long storage_needed; | |
212 | asymbol *sym; | |
213 | asymbol **symbol_table; | |
214 | long number_of_symbols; | |
215 | long i; | |
216 | int index; | |
217 | struct cleanup *back_to; | |
218 | CORE_ADDR symaddr; | |
d4f3574e | 219 | CORE_ADDR offset; |
c906108c SS |
220 | enum minimal_symbol_type ms_type; |
221 | /* If sectinfo is nonNULL, it contains section info that should end up | |
222 | filed in the objfile. */ | |
223 | struct stab_section_info *sectinfo = NULL; | |
224 | /* If filesym is nonzero, it points to a file symbol, but we haven't | |
225 | seen any section info for it yet. */ | |
226 | asymbol *filesym = 0; | |
227 | #ifdef SOFUN_ADDRESS_MAYBE_MISSING | |
228 | /* Name of filesym, as saved on the symbol_obstack. */ | |
229 | char *filesymname = obsavestring ("", 0, &objfile->symbol_obstack); | |
230 | #endif | |
231 | struct dbx_symfile_info *dbx = objfile->sym_stab_info; | |
232 | unsigned long size; | |
d4f3574e | 233 | int stripped = (bfd_get_symcount (objfile->obfd) == 0); |
c5aa993b | 234 | |
c906108c SS |
235 | if (dynamic) |
236 | { | |
d4f3574e | 237 | storage_needed = bfd_get_dynamic_symtab_upper_bound (objfile->obfd); |
c906108c SS |
238 | |
239 | /* Nothing to be done if there is no dynamic symtab. */ | |
240 | if (storage_needed < 0) | |
241 | return; | |
242 | } | |
243 | else | |
244 | { | |
d4f3574e | 245 | storage_needed = bfd_get_symtab_upper_bound (objfile->obfd); |
c906108c | 246 | if (storage_needed < 0) |
d4f3574e | 247 | error ("Can't read symbols from %s: %s", bfd_get_filename (objfile->obfd), |
c906108c SS |
248 | bfd_errmsg (bfd_get_error ())); |
249 | } | |
250 | if (storage_needed > 0) | |
251 | { | |
252 | symbol_table = (asymbol **) xmalloc (storage_needed); | |
b8c9b27d | 253 | back_to = make_cleanup (xfree, symbol_table); |
c906108c | 254 | if (dynamic) |
d4f3574e | 255 | number_of_symbols = bfd_canonicalize_dynamic_symtab (objfile->obfd, |
c906108c SS |
256 | symbol_table); |
257 | else | |
d4f3574e | 258 | number_of_symbols = bfd_canonicalize_symtab (objfile->obfd, symbol_table); |
c906108c | 259 | if (number_of_symbols < 0) |
d4f3574e | 260 | error ("Can't read symbols from %s: %s", bfd_get_filename (objfile->obfd), |
c906108c | 261 | bfd_errmsg (bfd_get_error ())); |
b8d39351 | 262 | |
c906108c SS |
263 | for (i = 0; i < number_of_symbols; i++) |
264 | { | |
265 | sym = symbol_table[i]; | |
c5aa993b | 266 | if (sym->name == NULL || *sym->name == '\0') |
c906108c SS |
267 | { |
268 | /* Skip names that don't exist (shouldn't happen), or names | |
c5aa993b | 269 | that are null strings (may happen). */ |
c906108c SS |
270 | continue; |
271 | } | |
272 | ||
b8d39351 | 273 | offset = ANOFFSET (objfile->section_offsets, sym->section->index); |
c906108c | 274 | if (dynamic |
c5aa993b JM |
275 | && sym->section == &bfd_und_section |
276 | && (sym->flags & BSF_FUNCTION)) | |
c906108c SS |
277 | { |
278 | struct minimal_symbol *msym; | |
279 | ||
280 | /* Symbol is a reference to a function defined in | |
c5aa993b JM |
281 | a shared library. |
282 | If its value is non zero then it is usually the address | |
283 | of the corresponding entry in the procedure linkage table, | |
d4f3574e | 284 | plus the desired section offset. |
c5aa993b JM |
285 | If its value is zero then the dynamic linker has to resolve |
286 | the symbol. We are unable to find any meaningful address | |
287 | for this symbol in the executable file, so we skip it. */ | |
288 | symaddr = sym->value; | |
c906108c SS |
289 | if (symaddr == 0) |
290 | continue; | |
d4f3574e | 291 | symaddr += offset; |
c906108c | 292 | msym = record_minimal_symbol_and_info |
c5aa993b JM |
293 | ((char *) sym->name, symaddr, |
294 | mst_solib_trampoline, NULL, sym->section, objfile); | |
c906108c SS |
295 | #ifdef SOFUN_ADDRESS_MAYBE_MISSING |
296 | if (msym != NULL) | |
297 | msym->filename = filesymname; | |
298 | #endif | |
299 | continue; | |
300 | } | |
301 | ||
302 | /* If it is a nonstripped executable, do not enter dynamic | |
303 | symbols, as the dynamic symbol table is usually a subset | |
304 | of the main symbol table. */ | |
305 | if (dynamic && !stripped) | |
306 | continue; | |
c5aa993b | 307 | if (sym->flags & BSF_FILE) |
c906108c SS |
308 | { |
309 | /* STT_FILE debugging symbol that helps stabs-in-elf debugging. | |
c5aa993b | 310 | Chain any old one onto the objfile; remember new sym. */ |
c906108c SS |
311 | if (sectinfo != NULL) |
312 | { | |
c5aa993b JM |
313 | sectinfo->next = dbx->stab_section_info; |
314 | dbx->stab_section_info = sectinfo; | |
c906108c SS |
315 | sectinfo = NULL; |
316 | } | |
317 | filesym = sym; | |
318 | #ifdef SOFUN_ADDRESS_MAYBE_MISSING | |
319 | filesymname = | |
c5aa993b | 320 | obsavestring ((char *) filesym->name, strlen (filesym->name), |
c906108c SS |
321 | &objfile->symbol_obstack); |
322 | #endif | |
323 | } | |
c5aa993b | 324 | else if (sym->flags & (BSF_GLOBAL | BSF_LOCAL | BSF_WEAK)) |
c906108c SS |
325 | { |
326 | struct minimal_symbol *msym; | |
327 | ||
328 | /* Select global/local/weak symbols. Note that bfd puts abs | |
c5aa993b JM |
329 | symbols in their own section, so all symbols we are |
330 | interested in will have a section. */ | |
c906108c | 331 | /* Bfd symbols are section relative. */ |
c5aa993b | 332 | symaddr = sym->value + sym->section->vma; |
d4f3574e | 333 | /* Relocate all non-absolute symbols by the section offset. */ |
c5aa993b | 334 | if (sym->section != &bfd_abs_section) |
c906108c | 335 | { |
d4f3574e | 336 | symaddr += offset; |
c906108c SS |
337 | } |
338 | /* For non-absolute symbols, use the type of the section | |
c5aa993b JM |
339 | they are relative to, to intuit text/data. Bfd provides |
340 | no way of figuring this out for absolute symbols. */ | |
341 | if (sym->section == &bfd_abs_section) | |
c906108c SS |
342 | { |
343 | /* This is a hack to get the minimal symbol type | |
11cf8741 | 344 | right for Irix 5, which has absolute addresses |
c906108c SS |
345 | with special section indices for dynamic symbols. */ |
346 | unsigned short shndx = | |
c5aa993b | 347 | ((elf_symbol_type *) sym)->internal_elf_sym.st_shndx; |
c906108c SS |
348 | |
349 | switch (shndx) | |
350 | { | |
351 | case SHN_MIPS_TEXT: | |
352 | ms_type = mst_text; | |
353 | break; | |
354 | case SHN_MIPS_DATA: | |
355 | ms_type = mst_data; | |
356 | break; | |
357 | case SHN_MIPS_ACOMMON: | |
358 | ms_type = mst_bss; | |
359 | break; | |
360 | default: | |
361 | ms_type = mst_abs; | |
362 | } | |
363 | ||
364 | /* If it is an Irix dynamic symbol, skip section name | |
d4f3574e | 365 | symbols, relocate all others by section offset. */ |
c906108c SS |
366 | if (ms_type != mst_abs) |
367 | { | |
368 | if (sym->name[0] == '.') | |
369 | continue; | |
d4f3574e | 370 | symaddr += offset; |
c906108c SS |
371 | } |
372 | } | |
c5aa993b | 373 | else if (sym->section->flags & SEC_CODE) |
c906108c | 374 | { |
c5aa993b | 375 | if (sym->flags & BSF_GLOBAL) |
c906108c SS |
376 | { |
377 | ms_type = mst_text; | |
378 | } | |
379 | else if ((sym->name[0] == '.' && sym->name[1] == 'L') | |
c5aa993b | 380 | || ((sym->flags & BSF_LOCAL) |
c906108c SS |
381 | && sym->name[0] == '$' |
382 | && sym->name[1] == 'L')) | |
383 | /* Looks like a compiler-generated label. Skip it. | |
384 | The assembler should be skipping these (to keep | |
385 | executables small), but apparently with gcc on the | |
386 | delta m88k SVR4, it loses. So to have us check too | |
387 | should be harmless (but I encourage people to fix this | |
388 | in the assembler instead of adding checks here). */ | |
389 | continue; | |
390 | #ifdef HARRIS_TARGET | |
391 | else if (sym->name[0] == '.' && sym->name[1] == '.') | |
392 | { | |
393 | /* Looks like a Harris compiler generated label for the | |
c5aa993b JM |
394 | purpose of marking instructions that are relevant to |
395 | DWARF dies. The assembler can't get rid of these | |
396 | because they are relocatable addresses that the | |
397 | linker needs to resolve. */ | |
c906108c SS |
398 | continue; |
399 | } | |
c5aa993b | 400 | #endif |
c906108c SS |
401 | else |
402 | { | |
403 | ms_type = mst_file_text; | |
404 | } | |
405 | } | |
c5aa993b | 406 | else if (sym->section->flags & SEC_ALLOC) |
c906108c | 407 | { |
bbeae047 | 408 | if (sym->flags & (BSF_GLOBAL | BSF_WEAK)) |
c906108c | 409 | { |
c5aa993b | 410 | if (sym->section->flags & SEC_LOAD) |
c906108c SS |
411 | { |
412 | ms_type = mst_data; | |
413 | } | |
414 | else | |
415 | { | |
416 | ms_type = mst_bss; | |
417 | } | |
418 | } | |
c5aa993b | 419 | else if (sym->flags & BSF_LOCAL) |
c906108c SS |
420 | { |
421 | /* Named Local variable in a Data section. Check its | |
c5aa993b JM |
422 | name for stabs-in-elf. The STREQ macro checks the |
423 | first character inline, so we only actually do a | |
424 | strcmp function call on names that start with 'B' | |
425 | or 'D' */ | |
c906108c | 426 | index = SECT_OFF_MAX; |
c5aa993b | 427 | if (STREQ ("Bbss.bss", sym->name)) |
c906108c | 428 | { |
b8fbeb18 | 429 | index = SECT_OFF_BSS (objfile); |
c906108c | 430 | } |
c5aa993b | 431 | else if (STREQ ("Ddata.data", sym->name)) |
c906108c | 432 | { |
b8fbeb18 | 433 | index = SECT_OFF_DATA (objfile); |
c906108c | 434 | } |
c5aa993b | 435 | else if (STREQ ("Drodata.rodata", sym->name)) |
c906108c | 436 | { |
b8fbeb18 | 437 | index = SECT_OFF_RODATA (objfile); |
c906108c SS |
438 | } |
439 | if (index != SECT_OFF_MAX) | |
440 | { | |
441 | /* Found a special local symbol. Allocate a | |
442 | sectinfo, if needed, and fill it in. */ | |
443 | if (sectinfo == NULL) | |
444 | { | |
445 | sectinfo = (struct stab_section_info *) | |
c5aa993b | 446 | xmmalloc (objfile->md, sizeof (*sectinfo)); |
c906108c SS |
447 | memset ((PTR) sectinfo, 0, sizeof (*sectinfo)); |
448 | if (filesym == NULL) | |
449 | { | |
450 | complain (§ion_info_complaint, | |
c5aa993b | 451 | sym->name); |
c906108c SS |
452 | } |
453 | else | |
454 | { | |
c5aa993b JM |
455 | sectinfo->filename = |
456 | (char *) filesym->name; | |
c906108c SS |
457 | } |
458 | } | |
a4c8257b EZ |
459 | if (index != -1) |
460 | { | |
461 | if (sectinfo->sections[index] != 0) | |
462 | { | |
463 | complain (§ion_info_dup_complaint, | |
464 | sectinfo->filename); | |
465 | } | |
c906108c | 466 | } |
a4c8257b | 467 | else |
8e65ff28 AC |
468 | internal_error (__FILE__, __LINE__, |
469 | "Section index uninitialized."); | |
c906108c | 470 | /* Bfd symbols are section relative. */ |
c5aa993b | 471 | symaddr = sym->value + sym->section->vma; |
d4f3574e | 472 | /* Relocate non-absolute symbols by the section offset. */ |
c5aa993b | 473 | if (sym->section != &bfd_abs_section) |
c906108c | 474 | { |
d4f3574e | 475 | symaddr += offset; |
c906108c | 476 | } |
a4c8257b EZ |
477 | if (index != -1) |
478 | sectinfo->sections[index] = symaddr; | |
479 | else | |
8e65ff28 AC |
480 | internal_error (__FILE__, __LINE__, |
481 | "Section index uninitialized."); | |
c906108c SS |
482 | /* The special local symbols don't go in the |
483 | minimal symbol table, so ignore this one. */ | |
484 | continue; | |
485 | } | |
486 | /* Not a special stabs-in-elf symbol, do regular | |
c5aa993b JM |
487 | symbol processing. */ |
488 | if (sym->section->flags & SEC_LOAD) | |
c906108c SS |
489 | { |
490 | ms_type = mst_file_data; | |
491 | } | |
492 | else | |
493 | { | |
494 | ms_type = mst_file_bss; | |
495 | } | |
496 | } | |
497 | else | |
498 | { | |
499 | ms_type = mst_unknown; | |
500 | } | |
501 | } | |
502 | else | |
503 | { | |
504 | /* FIXME: Solaris2 shared libraries include lots of | |
505 | odd "absolute" and "undefined" symbols, that play | |
506 | hob with actions like finding what function the PC | |
507 | is in. Ignore them if they aren't text, data, or bss. */ | |
508 | /* ms_type = mst_unknown; */ | |
c5aa993b | 509 | continue; /* Skip this symbol. */ |
c906108c SS |
510 | } |
511 | /* Pass symbol size field in via BFD. FIXME!!! */ | |
c5aa993b | 512 | size = ((elf_symbol_type *) sym)->internal_elf_sym.st_size; |
c906108c | 513 | msym = record_minimal_symbol_and_info |
c5aa993b JM |
514 | ((char *) sym->name, symaddr, |
515 | ms_type, (PTR) size, sym->section, objfile); | |
c906108c SS |
516 | #ifdef SOFUN_ADDRESS_MAYBE_MISSING |
517 | if (msym != NULL) | |
518 | msym->filename = filesymname; | |
519 | #endif | |
520 | #ifdef ELF_MAKE_MSYMBOL_SPECIAL | |
c5aa993b | 521 | ELF_MAKE_MSYMBOL_SPECIAL (sym, msym); |
c906108c SS |
522 | #endif |
523 | } | |
524 | } | |
525 | do_cleanups (back_to); | |
526 | } | |
527 | } | |
528 | ||
529 | /* Scan and build partial symbols for a symbol file. | |
530 | We have been initialized by a call to elf_symfile_init, which | |
531 | currently does nothing. | |
532 | ||
533 | SECTION_OFFSETS is a set of offsets to apply to relocate the symbols | |
534 | in each section. We simplify it down to a single offset for all | |
535 | symbols. FIXME. | |
536 | ||
537 | MAINLINE is true if we are reading the main symbol | |
538 | table (as opposed to a shared lib or dynamically loaded file). | |
539 | ||
540 | This function only does the minimum work necessary for letting the | |
541 | user "name" things symbolically; it does not read the entire symtab. | |
542 | Instead, it reads the external and static symbols and puts them in partial | |
543 | symbol tables. When more extensive information is requested of a | |
544 | file, the corresponding partial symbol table is mutated into a full | |
545 | fledged symbol table by going back and reading the symbols | |
546 | for real. | |
547 | ||
548 | We look for sections with specific names, to tell us what debug | |
549 | format to look for: FIXME!!! | |
550 | ||
551 | dwarf_build_psymtabs() builds psymtabs for DWARF symbols; | |
552 | elfstab_build_psymtabs() handles STABS symbols; | |
553 | mdebug_build_psymtabs() handles ECOFF debugging information. | |
554 | ||
555 | Note that ELF files have a "minimal" symbol table, which looks a lot | |
556 | like a COFF symbol table, but has only the minimal information necessary | |
557 | for linking. We process this also, and use the information to | |
558 | build gdb's minimal symbol table. This gives us some minimal debugging | |
559 | capability even for files compiled without -g. */ | |
560 | ||
561 | static void | |
fba45db2 | 562 | elf_symfile_read (struct objfile *objfile, int mainline) |
c906108c SS |
563 | { |
564 | bfd *abfd = objfile->obfd; | |
565 | struct elfinfo ei; | |
566 | struct cleanup *back_to; | |
567 | CORE_ADDR offset; | |
568 | ||
569 | init_minimal_symbol_collection (); | |
56e290f4 | 570 | back_to = make_cleanup_discard_minimal_symbols (); |
c906108c SS |
571 | |
572 | memset ((char *) &ei, 0, sizeof (ei)); | |
573 | ||
574 | /* Allocate struct to keep track of the symfile */ | |
575 | objfile->sym_stab_info = (struct dbx_symfile_info *) | |
c5aa993b | 576 | xmmalloc (objfile->md, sizeof (struct dbx_symfile_info)); |
c906108c SS |
577 | memset ((char *) objfile->sym_stab_info, 0, sizeof (struct dbx_symfile_info)); |
578 | make_cleanup (free_elfinfo, (PTR) objfile); | |
579 | ||
580 | /* Process the normal ELF symbol table first. This may write some | |
581 | chain of info into the dbx_symfile_info in objfile->sym_stab_info, | |
582 | which can later be used by elfstab_offset_sections. */ | |
583 | ||
d4f3574e | 584 | elf_symtab_read (objfile, 0); |
c906108c SS |
585 | |
586 | /* Add the dynamic symbols. */ | |
587 | ||
d4f3574e | 588 | elf_symtab_read (objfile, 1); |
c906108c SS |
589 | |
590 | /* Now process debugging information, which is contained in | |
591 | special ELF sections. */ | |
592 | ||
593 | /* If we are reinitializing, or if we have never loaded syms yet, | |
594 | set table to empty. MAINLINE is cleared so that *_read_psymtab | |
595 | functions do not all also re-initialize the psymbol table. */ | |
596 | if (mainline) | |
597 | { | |
598 | init_psymbol_list (objfile, 0); | |
599 | mainline = 0; | |
600 | } | |
601 | ||
602 | /* We first have to find them... */ | |
c5aa993b | 603 | bfd_map_over_sections (abfd, elf_locate_sections, (PTR) & ei); |
c906108c SS |
604 | |
605 | /* ELF debugging information is inserted into the psymtab in the | |
606 | order of least informative first - most informative last. Since | |
607 | the psymtab table is searched `most recent insertion first' this | |
608 | increases the probability that more detailed debug information | |
609 | for a section is found. | |
610 | ||
611 | For instance, an object file might contain both .mdebug (XCOFF) | |
612 | and .debug_info (DWARF2) sections then .mdebug is inserted first | |
613 | (searched last) and DWARF2 is inserted last (searched first). If | |
614 | we don't do this then the XCOFF info is found first - for code in | |
615 | an included file XCOFF info is useless. */ | |
616 | ||
617 | if (ei.mdebugsect) | |
618 | { | |
619 | const struct ecoff_debug_swap *swap; | |
620 | ||
621 | /* .mdebug section, presumably holding ECOFF debugging | |
c5aa993b | 622 | information. */ |
c906108c SS |
623 | swap = get_elf_backend_data (abfd)->elf_backend_ecoff_debug_swap; |
624 | if (swap) | |
d4f3574e | 625 | elfmdebug_build_psymtabs (objfile, swap, ei.mdebugsect); |
c906108c SS |
626 | } |
627 | if (ei.stabsect) | |
628 | { | |
629 | asection *str_sect; | |
630 | ||
631 | /* Stab sections have an associated string table that looks like | |
c5aa993b | 632 | a separate section. */ |
c906108c SS |
633 | str_sect = bfd_get_section_by_name (abfd, ".stabstr"); |
634 | ||
635 | /* FIXME should probably warn about a stab section without a stabstr. */ | |
636 | if (str_sect) | |
637 | elfstab_build_psymtabs (objfile, | |
c906108c SS |
638 | mainline, |
639 | ei.stabsect->filepos, | |
640 | bfd_section_size (abfd, ei.stabsect), | |
641 | str_sect->filepos, | |
642 | bfd_section_size (abfd, str_sect)); | |
643 | } | |
644 | if (dwarf2_has_info (abfd)) | |
645 | { | |
646 | /* DWARF 2 sections */ | |
d4f3574e | 647 | dwarf2_build_psymtabs (objfile, mainline); |
c906108c SS |
648 | } |
649 | else if (ei.dboffset && ei.lnoffset) | |
650 | { | |
651 | /* DWARF sections */ | |
652 | dwarf_build_psymtabs (objfile, | |
d4f3574e | 653 | mainline, |
c906108c SS |
654 | ei.dboffset, ei.dbsize, |
655 | ei.lnoffset, ei.lnsize); | |
656 | } | |
657 | ||
658 | /* Install any minimal symbols that have been collected as the current | |
659 | minimal symbols for this objfile. */ | |
660 | ||
661 | install_minimal_symbols (objfile); | |
662 | ||
663 | do_cleanups (back_to); | |
664 | } | |
665 | ||
666 | /* This cleans up the objfile's sym_stab_info pointer, and the chain of | |
667 | stab_section_info's, that might be dangling from it. */ | |
668 | ||
669 | static void | |
fba45db2 | 670 | free_elfinfo (PTR objp) |
c906108c | 671 | { |
c5aa993b | 672 | struct objfile *objfile = (struct objfile *) objp; |
c906108c SS |
673 | struct dbx_symfile_info *dbxinfo = objfile->sym_stab_info; |
674 | struct stab_section_info *ssi, *nssi; | |
675 | ||
676 | ssi = dbxinfo->stab_section_info; | |
677 | while (ssi) | |
678 | { | |
679 | nssi = ssi->next; | |
680 | mfree (objfile->md, ssi); | |
681 | ssi = nssi; | |
682 | } | |
683 | ||
684 | dbxinfo->stab_section_info = 0; /* Just say No mo info about this. */ | |
685 | } | |
686 | ||
687 | ||
688 | /* Initialize anything that needs initializing when a completely new symbol | |
689 | file is specified (not just adding some symbols from another file, e.g. a | |
690 | shared library). | |
691 | ||
692 | We reinitialize buildsym, since we may be reading stabs from an ELF file. */ | |
693 | ||
694 | static void | |
fba45db2 | 695 | elf_new_init (struct objfile *ignore) |
c906108c SS |
696 | { |
697 | stabsread_new_init (); | |
698 | buildsym_new_init (); | |
699 | } | |
700 | ||
701 | /* Perform any local cleanups required when we are done with a particular | |
702 | objfile. I.E, we are in the process of discarding all symbol information | |
703 | for an objfile, freeing up all memory held for it, and unlinking the | |
704 | objfile struct from the global list of known objfiles. */ | |
705 | ||
706 | static void | |
fba45db2 | 707 | elf_symfile_finish (struct objfile *objfile) |
c906108c | 708 | { |
c5aa993b | 709 | if (objfile->sym_stab_info != NULL) |
c906108c | 710 | { |
c5aa993b | 711 | mfree (objfile->md, objfile->sym_stab_info); |
c906108c SS |
712 | } |
713 | } | |
714 | ||
715 | /* ELF specific initialization routine for reading symbols. | |
716 | ||
717 | It is passed a pointer to a struct sym_fns which contains, among other | |
718 | things, the BFD for the file whose symbols are being read, and a slot for | |
719 | a pointer to "private data" which we can fill with goodies. | |
720 | ||
721 | For now at least, we have nothing in particular to do, so this function is | |
722 | just a stub. */ | |
723 | ||
724 | static void | |
fba45db2 | 725 | elf_symfile_init (struct objfile *objfile) |
c906108c SS |
726 | { |
727 | /* ELF objects may be reordered, so set OBJF_REORDERED. If we | |
728 | find this causes a significant slowdown in gdb then we could | |
729 | set it in the debug symbol readers only when necessary. */ | |
730 | objfile->flags |= OBJF_REORDERED; | |
731 | } | |
732 | ||
733 | /* When handling an ELF file that contains Sun STABS debug info, | |
734 | some of the debug info is relative to the particular chunk of the | |
735 | section that was generated in its individual .o file. E.g. | |
736 | offsets to static variables are relative to the start of the data | |
737 | segment *for that module before linking*. This information is | |
738 | painfully squirreled away in the ELF symbol table as local symbols | |
739 | with wierd names. Go get 'em when needed. */ | |
740 | ||
741 | void | |
fba45db2 | 742 | elfstab_offset_sections (struct objfile *objfile, struct partial_symtab *pst) |
c906108c SS |
743 | { |
744 | char *filename = pst->filename; | |
745 | struct dbx_symfile_info *dbx = objfile->sym_stab_info; | |
746 | struct stab_section_info *maybe = dbx->stab_section_info; | |
747 | struct stab_section_info *questionable = 0; | |
748 | int i; | |
749 | char *p; | |
750 | ||
751 | /* The ELF symbol info doesn't include path names, so strip the path | |
752 | (if any) from the psymtab filename. */ | |
753 | while (0 != (p = strchr (filename, '/'))) | |
c5aa993b | 754 | filename = p + 1; |
c906108c SS |
755 | |
756 | /* FIXME: This linear search could speed up significantly | |
757 | if it was chained in the right order to match how we search it, | |
758 | and if we unchained when we found a match. */ | |
759 | for (; maybe; maybe = maybe->next) | |
760 | { | |
761 | if (filename[0] == maybe->filename[0] | |
762 | && STREQ (filename, maybe->filename)) | |
763 | { | |
764 | /* We found a match. But there might be several source files | |
765 | (from different directories) with the same name. */ | |
766 | if (0 == maybe->found) | |
767 | break; | |
c5aa993b | 768 | questionable = maybe; /* Might use it later. */ |
c906108c SS |
769 | } |
770 | } | |
771 | ||
772 | if (maybe == 0 && questionable != 0) | |
773 | { | |
774 | complain (&stab_info_questionable_complaint, filename); | |
775 | maybe = questionable; | |
776 | } | |
777 | ||
778 | if (maybe) | |
779 | { | |
780 | /* Found it! Allocate a new psymtab struct, and fill it in. */ | |
781 | maybe->found++; | |
782 | pst->section_offsets = (struct section_offsets *) | |
96baa820 | 783 | obstack_alloc (&objfile->psymbol_obstack, SIZEOF_SECTION_OFFSETS); |
c906108c | 784 | for (i = 0; i < SECT_OFF_MAX; i++) |
a4c8257b | 785 | (pst->section_offsets)->offsets[i] = maybe->sections[i]; |
c906108c SS |
786 | return; |
787 | } | |
788 | ||
789 | /* We were unable to find any offsets for this file. Complain. */ | |
c5aa993b | 790 | if (dbx->stab_section_info) /* If there *is* any info, */ |
c906108c SS |
791 | complain (&stab_info_mismatch_complaint, filename); |
792 | } | |
793 | \f | |
794 | /* Register that we are able to handle ELF object file formats. */ | |
795 | ||
796 | static struct sym_fns elf_sym_fns = | |
797 | { | |
798 | bfd_target_elf_flavour, | |
c5aa993b JM |
799 | elf_new_init, /* sym_new_init: init anything gbl to entire symtab */ |
800 | elf_symfile_init, /* sym_init: read initial info, setup for sym_read() */ | |
801 | elf_symfile_read, /* sym_read: read a symbol file into symtab */ | |
802 | elf_symfile_finish, /* sym_finish: finished with file, cleanup */ | |
96baa820 | 803 | default_symfile_offsets, /* sym_offsets: Translate ext. to int. relocation */ |
c5aa993b | 804 | NULL /* next: pointer to next struct sym_fns */ |
c906108c SS |
805 | }; |
806 | ||
807 | void | |
fba45db2 | 808 | _initialize_elfread (void) |
c906108c SS |
809 | { |
810 | add_symtab_fns (&elf_sym_fns); | |
811 | } |