Commit | Line | Data |
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35f5886e | 1 | /* Read ELF (Executable and Linking Format) object files for GDB. |
c2e4669f | 2 | Copyright 1991, 1992 Free Software Foundation, Inc. |
35f5886e FF |
3 | Written by Fred Fish at Cygnus Support. |
4 | ||
5 | This file is part of GDB. | |
6 | ||
7 | This program is free software; you can redistribute it and/or modify | |
8 | it under the terms of the GNU General Public License as published by | |
9 | the Free Software Foundation; either version 2 of the License, or | |
10 | (at your option) any later version. | |
11 | ||
12 | This program is distributed in the hope that it will be useful, | |
13 | but WITHOUT ANY WARRANTY; without even the implied warranty of | |
14 | MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the | |
15 | GNU General Public License for more details. | |
16 | ||
17 | You should have received a copy of the GNU General Public License | |
18 | along with this program; if not, write to the Free Software | |
19 | Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA. */ | |
20 | ||
35f5886e | 21 | #include "defs.h" |
35f5886e | 22 | #include "bfd.h" |
f70be3e4 | 23 | #include "libbfd.h" /* For bfd_elf_find_section */ |
2084a176 | 24 | #include "libelf.h" |
35f5886e | 25 | #include "symtab.h" |
1ab3bf1b | 26 | #include "symfile.h" |
5e2e79f8 | 27 | #include "objfiles.h" |
be772100 | 28 | #include "buildsym.h" |
2670f34d | 29 | #include "gdb-stabs.h" |
51b80b00 | 30 | #include "complaints.h" |
740b7efa | 31 | #include <string.h> |
2e4964ad | 32 | #include "demangle.h" |
35f5886e | 33 | |
2670f34d JG |
34 | /* The struct elfinfo is available only during ELF symbol table and |
35 | psymtab reading. It is destroyed at the complation of psymtab-reading. | |
36 | It's local to elf_symfile_read. */ | |
37 | ||
35f5886e | 38 | struct elfinfo { |
d5931d79 | 39 | file_ptr dboffset; /* Offset to dwarf debug section */ |
35f5886e | 40 | unsigned int dbsize; /* Size of dwarf debug section */ |
d5931d79 | 41 | file_ptr lnoffset; /* Offset to dwarf line number section */ |
35f5886e | 42 | unsigned int lnsize; /* Size of dwarf line number section */ |
346168a2 JG |
43 | asection *stabsect; /* Section pointer for .stab section */ |
44 | asection *stabindexsect; /* Section pointer for .stab.index section */ | |
35f5886e FF |
45 | }; |
46 | ||
2670f34d JG |
47 | /* Various things we might complain about... */ |
48 | ||
49 | struct complaint section_info_complaint = | |
50 | {"elf/stab section information %s without a preceding file symbol", 0, 0}; | |
51 | ||
52 | struct complaint section_info_dup_complaint = | |
53 | {"duplicated elf/stab section information for %s", 0, 0}; | |
54 | ||
55 | struct complaint stab_info_mismatch_complaint = | |
56 | {"elf/stab section information missing for %s", 0, 0}; | |
57 | ||
58 | struct complaint stab_info_questionable_complaint = | |
59 | {"elf/stab section information questionable for %s", 0, 0}; | |
60 | ||
1ab3bf1b | 61 | static void |
80d68b1d | 62 | elf_symfile_init PARAMS ((struct objfile *)); |
1ab3bf1b JG |
63 | |
64 | static void | |
80d68b1d | 65 | elf_new_init PARAMS ((struct objfile *)); |
1ab3bf1b JG |
66 | |
67 | static void | |
2670f34d | 68 | elf_symfile_read PARAMS ((struct objfile *, struct section_offsets *, int)); |
80d68b1d FF |
69 | |
70 | static void | |
71 | elf_symfile_finish PARAMS ((struct objfile *)); | |
1ab3bf1b JG |
72 | |
73 | static void | |
be772100 | 74 | elf_symtab_read PARAMS ((bfd *, CORE_ADDR, struct objfile *)); |
1ab3bf1b | 75 | |
2670f34d JG |
76 | static void |
77 | free_elfinfo PARAMS ((PTR)); | |
78 | ||
79 | static struct section_offsets * | |
80 | elf_symfile_offsets PARAMS ((struct objfile *, CORE_ADDR)); | |
81 | ||
51b57ded FF |
82 | static void |
83 | record_minimal_symbol_and_info PARAMS ((char *, CORE_ADDR, | |
84 | enum minimal_symbol_type, char *, | |
85 | struct objfile *)); | |
1ab3bf1b JG |
86 | |
87 | static void | |
88 | elf_locate_sections PARAMS ((bfd *, asection *, PTR)); | |
89 | ||
35f5886e FF |
90 | /* We are called once per section from elf_symfile_read. We |
91 | need to examine each section we are passed, check to see | |
92 | if it is something we are interested in processing, and | |
93 | if so, stash away some access information for the section. | |
94 | ||
95 | For now we recognize the dwarf debug information sections and | |
96 | line number sections from matching their section names. The | |
97 | ELF definition is no real help here since it has no direct | |
98 | knowledge of DWARF (by design, so any debugging format can be | |
99 | used). | |
100 | ||
346168a2 JG |
101 | We also recognize the ".stab" sections used by the Sun compilers |
102 | released with Solaris 2. | |
103 | ||
35f5886e FF |
104 | FIXME: The section names should not be hardwired strings. */ |
105 | ||
106 | static void | |
be772100 JG |
107 | elf_locate_sections (ignore_abfd, sectp, eip) |
108 | bfd *ignore_abfd; | |
1ab3bf1b JG |
109 | asection *sectp; |
110 | PTR eip; | |
35f5886e | 111 | { |
1ab3bf1b JG |
112 | register struct elfinfo *ei; |
113 | ||
114 | ei = (struct elfinfo *) eip; | |
35f5886e FF |
115 | if (STREQ (sectp -> name, ".debug")) |
116 | { | |
117 | ei -> dboffset = sectp -> filepos; | |
e5849334 | 118 | ei -> dbsize = bfd_get_section_size_before_reloc (sectp); |
35f5886e FF |
119 | } |
120 | else if (STREQ (sectp -> name, ".line")) | |
121 | { | |
122 | ei -> lnoffset = sectp -> filepos; | |
e5849334 | 123 | ei -> lnsize = bfd_get_section_size_before_reloc (sectp); |
35f5886e | 124 | } |
346168a2 JG |
125 | else if (STREQ (sectp -> name, ".stab")) |
126 | { | |
127 | ei -> stabsect = sectp; | |
128 | } | |
129 | else if (STREQ (sectp -> name, ".stab.index")) | |
130 | { | |
131 | ei -> stabindexsect = sectp; | |
132 | } | |
35f5886e FF |
133 | } |
134 | ||
1ab3bf1b JG |
135 | #if 0 /* Currently unused */ |
136 | ||
f8b76e70 | 137 | char * |
1ab3bf1b JG |
138 | elf_interpreter (abfd) |
139 | bfd *abfd; | |
f8b76e70 FF |
140 | { |
141 | sec_ptr interp_sec; | |
142 | unsigned size; | |
143 | char *interp = NULL; | |
144 | ||
145 | interp_sec = bfd_get_section_by_name (abfd, ".interp"); | |
146 | if (interp_sec) | |
147 | { | |
148 | size = bfd_section_size (abfd, interp_sec); | |
149 | interp = alloca (size); | |
150 | if (bfd_get_section_contents (abfd, interp_sec, interp, (file_ptr)0, | |
151 | size)) | |
152 | { | |
153 | interp = savestring (interp, size - 1); | |
154 | } | |
155 | else | |
156 | { | |
157 | interp = NULL; | |
158 | } | |
159 | } | |
160 | return (interp); | |
161 | } | |
162 | ||
1ab3bf1b JG |
163 | #endif |
164 | ||
346168a2 JG |
165 | static void |
166 | record_minimal_symbol_and_info (name, address, ms_type, info, objfile) | |
167 | char *name; | |
168 | CORE_ADDR address; | |
169 | enum minimal_symbol_type ms_type; | |
170 | char *info; /* FIXME, is this really char *? */ | |
171 | struct objfile *objfile; | |
172 | { | |
173 | name = obsavestring (name, strlen (name), &objfile -> symbol_obstack); | |
3c02636b | 174 | prim_record_minimal_symbol_and_info (name, address, ms_type, info, -1); |
346168a2 JG |
175 | } |
176 | ||
f8b76e70 FF |
177 | /* |
178 | ||
179 | LOCAL FUNCTION | |
180 | ||
181 | elf_symtab_read -- read the symbol table of an ELF file | |
182 | ||
183 | SYNOPSIS | |
184 | ||
be772100 | 185 | void elf_symtab_read (bfd *abfd, CORE_ADDR addr, |
1ab3bf1b | 186 | struct objfile *objfile) |
f8b76e70 FF |
187 | |
188 | DESCRIPTION | |
189 | ||
190 | Given an open bfd, a base address to relocate symbols to, and a | |
191 | flag that specifies whether or not this bfd is for an executable | |
192 | or not (may be shared library for example), add all the global | |
1ab3bf1b | 193 | function and data symbols to the minimal symbol table. |
f8b76e70 | 194 | |
2670f34d JG |
195 | In stabs-in-ELF, as implemented by Sun, there are some local symbols |
196 | defined in the ELF symbol table, which can be used to locate | |
197 | the beginnings of sections from each ".o" file that was linked to | |
198 | form the executable objfile. We gather any such info and record it | |
199 | in data structures hung off the objfile's private data. | |
200 | ||
f8b76e70 FF |
201 | */ |
202 | ||
a7446af6 | 203 | static void |
be772100 | 204 | elf_symtab_read (abfd, addr, objfile) |
1ab3bf1b JG |
205 | bfd *abfd; |
206 | CORE_ADDR addr; | |
1ab3bf1b | 207 | struct objfile *objfile; |
a7446af6 FF |
208 | { |
209 | unsigned int storage_needed; | |
210 | asymbol *sym; | |
211 | asymbol **symbol_table; | |
212 | unsigned int number_of_symbols; | |
213 | unsigned int i; | |
2670f34d | 214 | int index; |
a7446af6 | 215 | struct cleanup *back_to; |
f8b76e70 | 216 | CORE_ADDR symaddr; |
1ab3bf1b | 217 | enum minimal_symbol_type ms_type; |
2670f34d JG |
218 | /* If sectinfo is nonzero, it contains section info that should end up |
219 | filed in the objfile. */ | |
220 | struct stab_section_info *sectinfo = 0; | |
221 | /* If filesym is nonzero, it points to a file symbol, but we haven't | |
222 | seen any section info for it yet. */ | |
223 | asymbol *filesym = 0; | |
224 | struct dbx_symfile_info *dbx = (struct dbx_symfile_info *) | |
225 | objfile->sym_private; | |
a7446af6 FF |
226 | |
227 | storage_needed = get_symtab_upper_bound (abfd); | |
228 | ||
229 | if (storage_needed > 0) | |
230 | { | |
3b0b9220 | 231 | symbol_table = (asymbol **) xmalloc (storage_needed); |
a7446af6 FF |
232 | back_to = make_cleanup (free, symbol_table); |
233 | number_of_symbols = bfd_canonicalize_symtab (abfd, symbol_table); | |
234 | ||
235 | for (i = 0; i < number_of_symbols; i++) | |
236 | { | |
2670f34d | 237 | sym = symbol_table[i]; |
d35bf52d FF |
238 | /* Select global/weak symbols that are defined in a specific section. |
239 | Note that bfd now puts abs symbols in their own section, so | |
240 | all symbols we are interested in will have a section. */ | |
241 | if ((sym -> flags & (BSF_GLOBAL | BSF_WEAK)) | |
242 | && (sym -> section != NULL)) | |
a7446af6 | 243 | { |
a608f919 FF |
244 | /* Bfd symbols are section relative. */ |
245 | symaddr = sym -> value + sym -> section -> vma; | |
c2e4669f JG |
246 | /* Relocate all non-absolute symbols by base address. */ |
247 | if (sym -> section != &bfd_abs_section) | |
2670f34d JG |
248 | symaddr += addr; |
249 | ||
f8b76e70 FF |
250 | /* For non-absolute symbols, use the type of the section |
251 | they are relative to, to intuit text/data. Bfd provides | |
252 | no way of figuring this out for absolute symbols. */ | |
d35bf52d | 253 | if (sym -> section -> flags & SEC_CODE) |
f8b76e70 | 254 | { |
1ab3bf1b | 255 | ms_type = mst_text; |
f8b76e70 | 256 | } |
d35bf52d | 257 | else if (sym -> section -> flags & SEC_DATA) |
f8b76e70 | 258 | { |
1ab3bf1b | 259 | ms_type = mst_data; |
f8b76e70 FF |
260 | } |
261 | else | |
262 | { | |
4c7c6bab JG |
263 | /* FIXME: Solaris2 shared libraries include lots of |
264 | odd "absolute" and "undefined" symbols, that play | |
265 | hob with actions like finding what function the PC | |
266 | is in. Ignore them if they aren't text or data. */ | |
267 | /* ms_type = mst_unknown; */ | |
268 | continue; /* Skip this symbol. */ | |
f8b76e70 | 269 | } |
346168a2 | 270 | /* Pass symbol size field in via BFD. FIXME!!! */ |
2084a176 KR |
271 | { |
272 | elf32_symbol_type *esym = (elf32_symbol_type *) sym; | |
273 | unsigned long size = esym->internal_elf_sym.st_size; | |
274 | record_minimal_symbol_and_info ((char *) sym -> name, symaddr, | |
275 | ms_type, (PTR) size, objfile); | |
276 | } | |
a7446af6 | 277 | } |
2670f34d JG |
278 | |
279 | /* See if this is a debugging symbol that helps Solaris | |
280 | stabs-in-elf debugging. */ | |
281 | ||
282 | else if (sym->flags & BSF_FILE) | |
283 | { | |
284 | /* Chain any old one onto the objfile; remember new sym. */ | |
285 | if (sectinfo) | |
286 | { | |
287 | sectinfo->next = dbx->stab_section_info; | |
288 | dbx->stab_section_info = sectinfo; | |
289 | sectinfo = 0; | |
290 | } | |
291 | filesym = sym; | |
292 | } | |
293 | else if ((sym->flags & BSF_LOCAL) && | |
294 | (sym->section) && | |
295 | (sym->section->flags & SEC_DATA) && | |
296 | (sym->name)) | |
297 | { | |
298 | /* Named Local variable in a Data section. Check its name. */ | |
299 | index = -1; | |
300 | switch (sym->name[1]) | |
301 | { | |
302 | case 'b': | |
2e4964ad | 303 | if (STREQ ("Bbss.bss", sym->name)) |
2670f34d JG |
304 | index = SECT_OFF_BSS; |
305 | break; | |
306 | case 'd': | |
2e4964ad | 307 | if (STREQ ("Ddata.data", sym->name)) |
2670f34d JG |
308 | index = SECT_OFF_DATA; |
309 | break; | |
310 | case 'r': | |
2e4964ad | 311 | if (STREQ ("Drodata.rodata", sym->name)) |
2670f34d JG |
312 | index = SECT_OFF_RODATA; |
313 | break; | |
314 | } | |
315 | if (index > 0) | |
316 | { | |
317 | /* We have some new info. Allocate a sectinfo, if | |
318 | needed, and fill it in. */ | |
319 | if (!sectinfo) | |
320 | { | |
321 | sectinfo = (struct stab_section_info *) | |
322 | xmmalloc (objfile -> md, | |
323 | sizeof (*sectinfo)); | |
324 | memset ((PTR) sectinfo, 0, sizeof (*sectinfo)); | |
325 | if (!filesym) | |
51b80b00 | 326 | complain (§ion_info_complaint, sym->name); |
2670f34d JG |
327 | else |
328 | sectinfo->filename = (char *)filesym->name; | |
329 | } | |
330 | if (sectinfo->sections[index]) | |
51b80b00 | 331 | complain (§ion_info_dup_complaint, sectinfo->filename); |
2670f34d | 332 | |
a608f919 FF |
333 | /* Bfd symbols are section relative. */ |
334 | symaddr = sym -> value + sym -> section -> vma; | |
2670f34d JG |
335 | /* Relocate all non-absolute symbols by base address. */ |
336 | if (sym -> section != &bfd_abs_section) | |
337 | symaddr += addr; | |
338 | sectinfo->sections[index] = symaddr; | |
339 | } | |
340 | } | |
a7446af6 FF |
341 | } |
342 | do_cleanups (back_to); | |
343 | } | |
344 | } | |
345 | ||
35f5886e FF |
346 | /* Scan and build partial symbols for a symbol file. |
347 | We have been initialized by a call to elf_symfile_init, which | |
348 | currently does nothing. | |
349 | ||
2670f34d JG |
350 | SECTION_OFFSETS is a set of offsets to apply to relocate the symbols |
351 | in each section. We simplify it down to a single offset for all | |
352 | symbols. FIXME. | |
35f5886e FF |
353 | |
354 | MAINLINE is true if we are reading the main symbol | |
355 | table (as opposed to a shared lib or dynamically loaded file). | |
356 | ||
357 | This function only does the minimum work necessary for letting the | |
358 | user "name" things symbolically; it does not read the entire symtab. | |
359 | Instead, it reads the external and static symbols and puts them in partial | |
360 | symbol tables. When more extensive information is requested of a | |
361 | file, the corresponding partial symbol table is mutated into a full | |
362 | fledged symbol table by going back and reading the symbols | |
346168a2 JG |
363 | for real. |
364 | ||
365 | We look for sections with specific names, to tell us what debug | |
366 | format to look for: FIXME!!! | |
367 | ||
368 | dwarf_build_psymtabs() builds psymtabs for DWARF symbols; | |
369 | elfstab_build_psymtabs() handles STABS symbols. | |
a7446af6 FF |
370 | |
371 | Note that ELF files have a "minimal" symbol table, which looks a lot | |
372 | like a COFF symbol table, but has only the minimal information necessary | |
346168a2 JG |
373 | for linking. We process this also, and use the information to |
374 | build gdb's minimal symbol table. This gives us some minimal debugging | |
375 | capability even for files compiled without -g. */ | |
35f5886e FF |
376 | |
377 | static void | |
2670f34d | 378 | elf_symfile_read (objfile, section_offsets, mainline) |
80d68b1d | 379 | struct objfile *objfile; |
2670f34d | 380 | struct section_offsets *section_offsets; |
1ab3bf1b | 381 | int mainline; |
35f5886e | 382 | { |
80d68b1d | 383 | bfd *abfd = objfile->obfd; |
35f5886e | 384 | struct elfinfo ei; |
a7446af6 | 385 | struct cleanup *back_to; |
346168a2 | 386 | CORE_ADDR offset; |
35f5886e | 387 | |
1ab3bf1b JG |
388 | init_minimal_symbol_collection (); |
389 | back_to = make_cleanup (discard_minimal_symbols, 0); | |
a7446af6 | 390 | |
2670f34d | 391 | memset ((char *) &ei, 0, sizeof (ei)); |
6b801388 | 392 | |
2670f34d JG |
393 | /* Allocate struct to keep track of the symfile */ |
394 | objfile->sym_private = (PTR) | |
395 | xmmalloc (objfile -> md, sizeof (struct dbx_symfile_info)); | |
396 | memset ((char *) objfile->sym_private, 0, sizeof (struct dbx_symfile_info)); | |
397 | make_cleanup (free_elfinfo, (PTR) objfile); | |
6b801388 | 398 | |
2670f34d JG |
399 | /* Process the normal ELF symbol table first. This may write some |
400 | chain of info into the dbx_symfile_info in objfile->sym_private, | |
401 | which can later be used by elfstab_offset_sections. */ | |
a7446af6 | 402 | |
2670f34d JG |
403 | /* FIXME, should take a section_offsets param, not just an offset. */ |
404 | offset = ANOFFSET (section_offsets, 0); | |
346168a2 | 405 | elf_symtab_read (abfd, offset, objfile); |
a7446af6 | 406 | |
346168a2 | 407 | /* Now process debugging information, which is contained in |
a7446af6 FF |
408 | special ELF sections. We first have to find them... */ |
409 | ||
1ab3bf1b | 410 | bfd_map_over_sections (abfd, elf_locate_sections, (PTR) &ei); |
35f5886e FF |
411 | if (ei.dboffset && ei.lnoffset) |
412 | { | |
346168a2 | 413 | /* DWARF sections */ |
d5931d79 | 414 | dwarf_build_psymtabs (objfile, |
2670f34d | 415 | section_offsets, mainline, |
35f5886e | 416 | ei.dboffset, ei.dbsize, |
d5931d79 | 417 | ei.lnoffset, ei.lnsize); |
35f5886e | 418 | } |
346168a2 JG |
419 | if (ei.stabsect) |
420 | { | |
421 | /* STABS sections */ | |
422 | ||
423 | /* FIXME: Sun didn't really know how to implement this well. | |
424 | They made .stab sections that don't point to the .stabstr | |
425 | section with the sh_link field. BFD doesn't make string table | |
426 | sections visible to the caller. So we have to search the | |
427 | ELF section table, not the BFD section table, for the string | |
428 | table. */ | |
2084a176 | 429 | struct elf32_internal_shdr *elf_sect; |
346168a2 | 430 | |
872dd3fe | 431 | elf_sect = bfd_elf_find_section (abfd, ".stabstr"); |
346168a2 JG |
432 | if (elf_sect) |
433 | elfstab_build_psymtabs (objfile, | |
2670f34d | 434 | section_offsets, |
346168a2 JG |
435 | mainline, |
436 | ei.stabsect->filepos, /* .stab offset */ | |
437 | bfd_get_section_size_before_reloc (ei.stabsect),/* .stab size */ | |
d5931d79 | 438 | (file_ptr) elf_sect->sh_offset, /* .stabstr offset */ |
346168a2 JG |
439 | elf_sect->sh_size); /* .stabstr size */ |
440 | } | |
a7446af6 | 441 | |
1ab3bf1b | 442 | if (!have_partial_symbols ()) |
35f5886e FF |
443 | { |
444 | wrap_here (""); | |
445 | printf_filtered ("(no debugging symbols found)..."); | |
446 | wrap_here (""); | |
447 | } | |
a7446af6 | 448 | |
1ab3bf1b JG |
449 | /* Install any minimal symbols that have been collected as the current |
450 | minimal symbols for this objfile. */ | |
451 | ||
80d68b1d | 452 | install_minimal_symbols (objfile); |
1ab3bf1b | 453 | |
a7446af6 | 454 | do_cleanups (back_to); |
35f5886e FF |
455 | } |
456 | ||
2670f34d JG |
457 | /* This cleans up the objfile's sym_private pointer, and the chain of |
458 | stab_section_info's, that might be dangling from it. */ | |
459 | ||
460 | static void | |
461 | free_elfinfo (objp) | |
462 | PTR objp; | |
463 | { | |
464 | struct objfile *objfile = (struct objfile *)objp; | |
465 | struct dbx_symfile_info *dbxinfo = (struct dbx_symfile_info *) | |
466 | objfile->sym_private; | |
467 | struct stab_section_info *ssi, *nssi; | |
468 | ||
469 | ssi = dbxinfo->stab_section_info; | |
470 | while (ssi) | |
471 | { | |
472 | nssi = ssi->next; | |
473 | mfree (objfile->md, ssi); | |
474 | ssi = nssi; | |
475 | } | |
476 | ||
477 | dbxinfo->stab_section_info = 0; /* Just say No mo info about this. */ | |
478 | } | |
479 | ||
480 | ||
35f5886e FF |
481 | /* Initialize anything that needs initializing when a completely new symbol |
482 | file is specified (not just adding some symbols from another file, e.g. a | |
483 | shared library). | |
484 | ||
346168a2 | 485 | We reinitialize buildsym, since we may be reading stabs from an ELF file. */ |
35f5886e FF |
486 | |
487 | static void | |
be772100 JG |
488 | elf_new_init (ignore) |
489 | struct objfile *ignore; | |
80d68b1d | 490 | { |
d07734e3 | 491 | stabsread_new_init (); |
80d68b1d FF |
492 | buildsym_new_init (); |
493 | } | |
494 | ||
495 | /* Perform any local cleanups required when we are done with a particular | |
496 | objfile. I.E, we are in the process of discarding all symbol information | |
497 | for an objfile, freeing up all memory held for it, and unlinking the | |
498 | objfile struct from the global list of known objfiles. */ | |
499 | ||
500 | static void | |
501 | elf_symfile_finish (objfile) | |
502 | struct objfile *objfile; | |
35f5886e | 503 | { |
80d68b1d FF |
504 | if (objfile -> sym_private != NULL) |
505 | { | |
506 | mfree (objfile -> md, objfile -> sym_private); | |
507 | } | |
35f5886e FF |
508 | } |
509 | ||
510 | /* ELF specific initialization routine for reading symbols. | |
511 | ||
512 | It is passed a pointer to a struct sym_fns which contains, among other | |
513 | things, the BFD for the file whose symbols are being read, and a slot for | |
514 | a pointer to "private data" which we can fill with goodies. | |
515 | ||
516 | For now at least, we have nothing in particular to do, so this function is | |
517 | just a stub. */ | |
518 | ||
519 | static void | |
be772100 JG |
520 | elf_symfile_init (ignore) |
521 | struct objfile *ignore; | |
35f5886e FF |
522 | { |
523 | } | |
524 | ||
2670f34d JG |
525 | /* ELF specific parsing routine for section offsets. |
526 | ||
527 | Plain and simple for now. */ | |
528 | ||
529 | static | |
530 | struct section_offsets * | |
531 | elf_symfile_offsets (objfile, addr) | |
532 | struct objfile *objfile; | |
533 | CORE_ADDR addr; | |
534 | { | |
535 | struct section_offsets *section_offsets; | |
536 | int i; | |
537 | ||
538 | section_offsets = (struct section_offsets *) | |
539 | obstack_alloc (&objfile -> psymbol_obstack, | |
540 | sizeof (struct section_offsets) + | |
541 | sizeof (section_offsets->offsets) * (SECT_OFF_MAX-1)); | |
542 | ||
543 | for (i = 0; i < SECT_OFF_MAX; i++) | |
544 | ANOFFSET (section_offsets, i) = addr; | |
545 | ||
546 | return section_offsets; | |
547 | } | |
548 | \f | |
549 | /* When handling an ELF file that contains Sun STABS debug info, | |
550 | some of the debug info is relative to the particular chunk of the | |
551 | section that was generated in its individual .o file. E.g. | |
552 | offsets to static variables are relative to the start of the data | |
553 | segment *for that module before linking*. This information is | |
554 | painfully squirreled away in the ELF symbol table as local symbols | |
555 | with wierd names. Go get 'em when needed. */ | |
556 | ||
557 | void | |
558 | elfstab_offset_sections (objfile, pst) | |
559 | struct objfile *objfile; | |
560 | struct partial_symtab *pst; | |
561 | { | |
562 | char *filename = pst->filename; | |
563 | struct dbx_symfile_info *dbx = (struct dbx_symfile_info *) | |
564 | objfile->sym_private; | |
565 | struct stab_section_info *maybe = dbx->stab_section_info; | |
566 | struct stab_section_info *questionable = 0; | |
567 | int i; | |
568 | char *p; | |
569 | ||
570 | /* The ELF symbol info doesn't include path names, so strip the path | |
571 | (if any) from the psymtab filename. */ | |
572 | while (0 != (p = strchr (filename, '/'))) | |
573 | filename = p+1; | |
574 | ||
575 | /* FIXME: This linear search could speed up significantly | |
576 | if it was chained in the right order to match how we search it, | |
577 | and if we unchained when we found a match. */ | |
578 | for (; maybe; maybe = maybe->next) | |
579 | { | |
580 | if (filename[0] == maybe->filename[0] | |
2e4964ad | 581 | && STREQ (filename, maybe->filename)) |
2670f34d JG |
582 | { |
583 | /* We found a match. But there might be several source files | |
584 | (from different directories) with the same name. */ | |
585 | if (0 == maybe->found) | |
586 | break; | |
587 | questionable = maybe; /* Might use it later. */ | |
588 | } | |
589 | } | |
590 | ||
591 | if (maybe == 0 && questionable != 0) | |
592 | { | |
593 | complain (&stab_info_questionable_complaint, filename); | |
594 | maybe = questionable; | |
595 | } | |
596 | ||
597 | if (maybe) | |
598 | { | |
599 | /* Found it! Allocate a new psymtab struct, and fill it in. */ | |
600 | maybe->found++; | |
601 | pst->section_offsets = (struct section_offsets *) | |
602 | obstack_alloc (&objfile -> psymbol_obstack, | |
603 | sizeof (struct section_offsets) + | |
604 | sizeof (pst->section_offsets->offsets) * (SECT_OFF_MAX-1)); | |
605 | ||
606 | for (i = 0; i < SECT_OFF_MAX; i++) | |
607 | ANOFFSET (pst->section_offsets, i) = maybe->sections[i]; | |
608 | return; | |
609 | } | |
610 | ||
611 | /* We were unable to find any offsets for this file. Complain. */ | |
612 | if (dbx->stab_section_info) /* If there *is* any info, */ | |
613 | complain (&stab_info_mismatch_complaint, filename); | |
614 | } | |
35f5886e FF |
615 | \f |
616 | /* Register that we are able to handle ELF object file formats and DWARF | |
617 | debugging formats. | |
618 | ||
619 | Unlike other object file formats, where the debugging information format | |
620 | is implied by the object file format, the ELF object file format and the | |
621 | DWARF debugging information format are two distinct, and potentially | |
622 | separate entities. I.E. it is perfectly possible to have ELF objects | |
623 | with debugging formats other than DWARF. And it is conceivable that the | |
624 | DWARF debugging format might be used with another object file format, | |
625 | like COFF, by simply using COFF's custom section feature. | |
626 | ||
627 | GDB, and to a lesser extent BFD, should support the notion of separate | |
628 | object file formats and debugging information formats. For now, we just | |
629 | use "elf" in the same sense as "a.out" or "coff", to imply both the ELF | |
630 | object file format and the DWARF debugging format. */ | |
631 | ||
80d68b1d FF |
632 | static struct sym_fns elf_sym_fns = |
633 | { | |
35f5886e FF |
634 | "elf", /* sym_name: name or name prefix of BFD target type */ |
635 | 3, /* sym_namelen: number of significant sym_name chars */ | |
636 | elf_new_init, /* sym_new_init: init anything gbl to entire symtab */ | |
637 | elf_symfile_init, /* sym_init: read initial info, setup for sym_read() */ | |
638 | elf_symfile_read, /* sym_read: read a symbol file into symtab */ | |
80d68b1d | 639 | elf_symfile_finish, /* sym_finish: finished with file, cleanup */ |
2670f34d | 640 | elf_symfile_offsets, /* sym_offsets: Translate ext. to int. relocation */ |
35f5886e FF |
641 | NULL /* next: pointer to next struct sym_fns */ |
642 | }; | |
643 | ||
644 | void | |
1ab3bf1b | 645 | _initialize_elfread () |
35f5886e FF |
646 | { |
647 | add_symtab_fns (&elf_sym_fns); | |
648 | } |