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 | ||
21 | /************************************************************************ | |
22 | * * | |
23 | * NOTICE * | |
24 | * * | |
25 | * This file is still under construction. When it is complete, this * | |
26 | * notice will be removed. Until then, direct any questions or changes * | |
c2e4669f | 27 | * to Fred Fish at Cygnus Support (fnf@cygnus.com) * |
35f5886e FF |
28 | * * |
29 | * FIXME Still needs support for shared libraries. * | |
30 | * FIXME Still needs support for core files. * | |
31 | * FIXME The ".debug" and ".line" section names are hardwired. * | |
35f5886e FF |
32 | * * |
33 | ************************************************************************/ | |
34 | ||
35f5886e | 35 | #include "defs.h" |
35f5886e | 36 | #include "bfd.h" |
f70be3e4 | 37 | #include "libbfd.h" /* For bfd_elf_find_section */ |
2084a176 | 38 | #include "libelf.h" |
35f5886e | 39 | #include "symtab.h" |
1ab3bf1b | 40 | #include "symfile.h" |
5e2e79f8 | 41 | #include "objfiles.h" |
be772100 | 42 | #include "buildsym.h" |
2670f34d | 43 | #include "gdb-stabs.h" |
51b80b00 | 44 | #include "complaints.h" |
740b7efa | 45 | #include <string.h> |
2e4964ad | 46 | #include "demangle.h" |
35f5886e | 47 | |
2670f34d JG |
48 | /* The struct elfinfo is available only during ELF symbol table and |
49 | psymtab reading. It is destroyed at the complation of psymtab-reading. | |
50 | It's local to elf_symfile_read. */ | |
51 | ||
35f5886e | 52 | struct elfinfo { |
d5931d79 | 53 | file_ptr dboffset; /* Offset to dwarf debug section */ |
35f5886e | 54 | unsigned int dbsize; /* Size of dwarf debug section */ |
d5931d79 | 55 | file_ptr lnoffset; /* Offset to dwarf line number section */ |
35f5886e | 56 | unsigned int lnsize; /* Size of dwarf line number section */ |
346168a2 JG |
57 | asection *stabsect; /* Section pointer for .stab section */ |
58 | asection *stabindexsect; /* Section pointer for .stab.index section */ | |
35f5886e FF |
59 | }; |
60 | ||
2670f34d JG |
61 | /* Various things we might complain about... */ |
62 | ||
63 | struct complaint section_info_complaint = | |
64 | {"elf/stab section information %s without a preceding file symbol", 0, 0}; | |
65 | ||
66 | struct complaint section_info_dup_complaint = | |
67 | {"duplicated elf/stab section information for %s", 0, 0}; | |
68 | ||
69 | struct complaint stab_info_mismatch_complaint = | |
70 | {"elf/stab section information missing for %s", 0, 0}; | |
71 | ||
72 | struct complaint stab_info_questionable_complaint = | |
73 | {"elf/stab section information questionable for %s", 0, 0}; | |
74 | ||
1ab3bf1b | 75 | static void |
80d68b1d | 76 | elf_symfile_init PARAMS ((struct objfile *)); |
1ab3bf1b JG |
77 | |
78 | static void | |
80d68b1d | 79 | elf_new_init PARAMS ((struct objfile *)); |
1ab3bf1b JG |
80 | |
81 | static void | |
2670f34d | 82 | elf_symfile_read PARAMS ((struct objfile *, struct section_offsets *, int)); |
80d68b1d FF |
83 | |
84 | static void | |
85 | elf_symfile_finish PARAMS ((struct objfile *)); | |
1ab3bf1b JG |
86 | |
87 | static void | |
be772100 | 88 | elf_symtab_read PARAMS ((bfd *, CORE_ADDR, struct objfile *)); |
1ab3bf1b | 89 | |
2670f34d JG |
90 | static void |
91 | free_elfinfo PARAMS ((PTR)); | |
92 | ||
93 | static struct section_offsets * | |
94 | elf_symfile_offsets PARAMS ((struct objfile *, CORE_ADDR)); | |
95 | ||
51b57ded FF |
96 | static void |
97 | record_minimal_symbol_and_info PARAMS ((char *, CORE_ADDR, | |
98 | enum minimal_symbol_type, char *, | |
99 | struct objfile *)); | |
1ab3bf1b JG |
100 | |
101 | static void | |
102 | elf_locate_sections PARAMS ((bfd *, asection *, PTR)); | |
103 | ||
35f5886e FF |
104 | /* We are called once per section from elf_symfile_read. We |
105 | need to examine each section we are passed, check to see | |
106 | if it is something we are interested in processing, and | |
107 | if so, stash away some access information for the section. | |
108 | ||
109 | For now we recognize the dwarf debug information sections and | |
110 | line number sections from matching their section names. The | |
111 | ELF definition is no real help here since it has no direct | |
112 | knowledge of DWARF (by design, so any debugging format can be | |
113 | used). | |
114 | ||
346168a2 JG |
115 | We also recognize the ".stab" sections used by the Sun compilers |
116 | released with Solaris 2. | |
117 | ||
35f5886e FF |
118 | FIXME: The section names should not be hardwired strings. */ |
119 | ||
120 | static void | |
be772100 JG |
121 | elf_locate_sections (ignore_abfd, sectp, eip) |
122 | bfd *ignore_abfd; | |
1ab3bf1b JG |
123 | asection *sectp; |
124 | PTR eip; | |
35f5886e | 125 | { |
1ab3bf1b JG |
126 | register struct elfinfo *ei; |
127 | ||
128 | ei = (struct elfinfo *) eip; | |
35f5886e FF |
129 | if (STREQ (sectp -> name, ".debug")) |
130 | { | |
131 | ei -> dboffset = sectp -> filepos; | |
e5849334 | 132 | ei -> dbsize = bfd_get_section_size_before_reloc (sectp); |
35f5886e FF |
133 | } |
134 | else if (STREQ (sectp -> name, ".line")) | |
135 | { | |
136 | ei -> lnoffset = sectp -> filepos; | |
e5849334 | 137 | ei -> lnsize = bfd_get_section_size_before_reloc (sectp); |
35f5886e | 138 | } |
346168a2 JG |
139 | else if (STREQ (sectp -> name, ".stab")) |
140 | { | |
141 | ei -> stabsect = sectp; | |
142 | } | |
143 | else if (STREQ (sectp -> name, ".stab.index")) | |
144 | { | |
145 | ei -> stabindexsect = sectp; | |
146 | } | |
35f5886e FF |
147 | } |
148 | ||
1ab3bf1b JG |
149 | #if 0 /* Currently unused */ |
150 | ||
f8b76e70 | 151 | char * |
1ab3bf1b JG |
152 | elf_interpreter (abfd) |
153 | bfd *abfd; | |
f8b76e70 FF |
154 | { |
155 | sec_ptr interp_sec; | |
156 | unsigned size; | |
157 | char *interp = NULL; | |
158 | ||
159 | interp_sec = bfd_get_section_by_name (abfd, ".interp"); | |
160 | if (interp_sec) | |
161 | { | |
162 | size = bfd_section_size (abfd, interp_sec); | |
163 | interp = alloca (size); | |
164 | if (bfd_get_section_contents (abfd, interp_sec, interp, (file_ptr)0, | |
165 | size)) | |
166 | { | |
167 | interp = savestring (interp, size - 1); | |
168 | } | |
169 | else | |
170 | { | |
171 | interp = NULL; | |
172 | } | |
173 | } | |
174 | return (interp); | |
175 | } | |
176 | ||
1ab3bf1b JG |
177 | #endif |
178 | ||
346168a2 JG |
179 | static void |
180 | record_minimal_symbol_and_info (name, address, ms_type, info, objfile) | |
181 | char *name; | |
182 | CORE_ADDR address; | |
183 | enum minimal_symbol_type ms_type; | |
184 | char *info; /* FIXME, is this really char *? */ | |
185 | struct objfile *objfile; | |
186 | { | |
187 | name = obsavestring (name, strlen (name), &objfile -> symbol_obstack); | |
3c02636b | 188 | prim_record_minimal_symbol_and_info (name, address, ms_type, info, -1); |
346168a2 JG |
189 | } |
190 | ||
f8b76e70 FF |
191 | /* |
192 | ||
193 | LOCAL FUNCTION | |
194 | ||
195 | elf_symtab_read -- read the symbol table of an ELF file | |
196 | ||
197 | SYNOPSIS | |
198 | ||
be772100 | 199 | void elf_symtab_read (bfd *abfd, CORE_ADDR addr, |
1ab3bf1b | 200 | struct objfile *objfile) |
f8b76e70 FF |
201 | |
202 | DESCRIPTION | |
203 | ||
204 | Given an open bfd, a base address to relocate symbols to, and a | |
205 | flag that specifies whether or not this bfd is for an executable | |
206 | or not (may be shared library for example), add all the global | |
1ab3bf1b | 207 | function and data symbols to the minimal symbol table. |
f8b76e70 | 208 | |
2670f34d JG |
209 | In stabs-in-ELF, as implemented by Sun, there are some local symbols |
210 | defined in the ELF symbol table, which can be used to locate | |
211 | the beginnings of sections from each ".o" file that was linked to | |
212 | form the executable objfile. We gather any such info and record it | |
213 | in data structures hung off the objfile's private data. | |
214 | ||
f8b76e70 FF |
215 | */ |
216 | ||
a7446af6 | 217 | static void |
be772100 | 218 | elf_symtab_read (abfd, addr, objfile) |
1ab3bf1b JG |
219 | bfd *abfd; |
220 | CORE_ADDR addr; | |
1ab3bf1b | 221 | struct objfile *objfile; |
a7446af6 FF |
222 | { |
223 | unsigned int storage_needed; | |
224 | asymbol *sym; | |
225 | asymbol **symbol_table; | |
226 | unsigned int number_of_symbols; | |
227 | unsigned int i; | |
2670f34d | 228 | int index; |
a7446af6 | 229 | struct cleanup *back_to; |
f8b76e70 | 230 | CORE_ADDR symaddr; |
1ab3bf1b | 231 | enum minimal_symbol_type ms_type; |
2670f34d JG |
232 | /* If sectinfo is nonzero, it contains section info that should end up |
233 | filed in the objfile. */ | |
234 | struct stab_section_info *sectinfo = 0; | |
235 | /* If filesym is nonzero, it points to a file symbol, but we haven't | |
236 | seen any section info for it yet. */ | |
237 | asymbol *filesym = 0; | |
238 | struct dbx_symfile_info *dbx = (struct dbx_symfile_info *) | |
239 | objfile->sym_private; | |
a7446af6 FF |
240 | |
241 | storage_needed = get_symtab_upper_bound (abfd); | |
242 | ||
243 | if (storage_needed > 0) | |
244 | { | |
3b0b9220 | 245 | symbol_table = (asymbol **) xmalloc (storage_needed); |
a7446af6 FF |
246 | back_to = make_cleanup (free, symbol_table); |
247 | number_of_symbols = bfd_canonicalize_symtab (abfd, symbol_table); | |
248 | ||
249 | for (i = 0; i < number_of_symbols; i++) | |
250 | { | |
2670f34d | 251 | sym = symbol_table[i]; |
d35bf52d FF |
252 | /* Select global/weak symbols that are defined in a specific section. |
253 | Note that bfd now puts abs symbols in their own section, so | |
254 | all symbols we are interested in will have a section. */ | |
255 | if ((sym -> flags & (BSF_GLOBAL | BSF_WEAK)) | |
256 | && (sym -> section != NULL)) | |
a7446af6 | 257 | { |
f8b76e70 | 258 | symaddr = sym -> value; |
c2e4669f JG |
259 | /* Relocate all non-absolute symbols by base address. */ |
260 | if (sym -> section != &bfd_abs_section) | |
2670f34d JG |
261 | symaddr += addr; |
262 | ||
f8b76e70 FF |
263 | /* For non-absolute symbols, use the type of the section |
264 | they are relative to, to intuit text/data. Bfd provides | |
265 | no way of figuring this out for absolute symbols. */ | |
d35bf52d | 266 | if (sym -> section -> flags & SEC_CODE) |
f8b76e70 | 267 | { |
1ab3bf1b | 268 | ms_type = mst_text; |
f8b76e70 | 269 | } |
d35bf52d | 270 | else if (sym -> section -> flags & SEC_DATA) |
f8b76e70 | 271 | { |
1ab3bf1b | 272 | ms_type = mst_data; |
f8b76e70 FF |
273 | } |
274 | else | |
275 | { | |
4c7c6bab JG |
276 | /* FIXME: Solaris2 shared libraries include lots of |
277 | odd "absolute" and "undefined" symbols, that play | |
278 | hob with actions like finding what function the PC | |
279 | is in. Ignore them if they aren't text or data. */ | |
280 | /* ms_type = mst_unknown; */ | |
281 | continue; /* Skip this symbol. */ | |
f8b76e70 | 282 | } |
346168a2 | 283 | /* Pass symbol size field in via BFD. FIXME!!! */ |
2084a176 KR |
284 | { |
285 | elf32_symbol_type *esym = (elf32_symbol_type *) sym; | |
286 | unsigned long size = esym->internal_elf_sym.st_size; | |
287 | record_minimal_symbol_and_info ((char *) sym -> name, symaddr, | |
288 | ms_type, (PTR) size, objfile); | |
289 | } | |
a7446af6 | 290 | } |
2670f34d JG |
291 | |
292 | /* See if this is a debugging symbol that helps Solaris | |
293 | stabs-in-elf debugging. */ | |
294 | ||
295 | else if (sym->flags & BSF_FILE) | |
296 | { | |
297 | /* Chain any old one onto the objfile; remember new sym. */ | |
298 | if (sectinfo) | |
299 | { | |
300 | sectinfo->next = dbx->stab_section_info; | |
301 | dbx->stab_section_info = sectinfo; | |
302 | sectinfo = 0; | |
303 | } | |
304 | filesym = sym; | |
305 | } | |
306 | else if ((sym->flags & BSF_LOCAL) && | |
307 | (sym->section) && | |
308 | (sym->section->flags & SEC_DATA) && | |
309 | (sym->name)) | |
310 | { | |
311 | /* Named Local variable in a Data section. Check its name. */ | |
312 | index = -1; | |
313 | switch (sym->name[1]) | |
314 | { | |
315 | case 'b': | |
2e4964ad | 316 | if (STREQ ("Bbss.bss", sym->name)) |
2670f34d JG |
317 | index = SECT_OFF_BSS; |
318 | break; | |
319 | case 'd': | |
2e4964ad | 320 | if (STREQ ("Ddata.data", sym->name)) |
2670f34d JG |
321 | index = SECT_OFF_DATA; |
322 | break; | |
323 | case 'r': | |
2e4964ad | 324 | if (STREQ ("Drodata.rodata", sym->name)) |
2670f34d JG |
325 | index = SECT_OFF_RODATA; |
326 | break; | |
327 | } | |
328 | if (index > 0) | |
329 | { | |
330 | /* We have some new info. Allocate a sectinfo, if | |
331 | needed, and fill it in. */ | |
332 | if (!sectinfo) | |
333 | { | |
334 | sectinfo = (struct stab_section_info *) | |
335 | xmmalloc (objfile -> md, | |
336 | sizeof (*sectinfo)); | |
337 | memset ((PTR) sectinfo, 0, sizeof (*sectinfo)); | |
338 | if (!filesym) | |
51b80b00 | 339 | complain (§ion_info_complaint, sym->name); |
2670f34d JG |
340 | else |
341 | sectinfo->filename = (char *)filesym->name; | |
342 | } | |
343 | if (sectinfo->sections[index]) | |
51b80b00 | 344 | complain (§ion_info_dup_complaint, sectinfo->filename); |
2670f34d JG |
345 | |
346 | symaddr = sym -> value; | |
347 | /* Relocate all non-absolute symbols by base address. */ | |
348 | if (sym -> section != &bfd_abs_section) | |
349 | symaddr += addr; | |
350 | sectinfo->sections[index] = symaddr; | |
351 | } | |
352 | } | |
a7446af6 FF |
353 | } |
354 | do_cleanups (back_to); | |
355 | } | |
356 | } | |
357 | ||
35f5886e FF |
358 | /* Scan and build partial symbols for a symbol file. |
359 | We have been initialized by a call to elf_symfile_init, which | |
360 | currently does nothing. | |
361 | ||
2670f34d JG |
362 | SECTION_OFFSETS is a set of offsets to apply to relocate the symbols |
363 | in each section. We simplify it down to a single offset for all | |
364 | symbols. FIXME. | |
35f5886e FF |
365 | |
366 | MAINLINE is true if we are reading the main symbol | |
367 | table (as opposed to a shared lib or dynamically loaded file). | |
368 | ||
369 | This function only does the minimum work necessary for letting the | |
370 | user "name" things symbolically; it does not read the entire symtab. | |
371 | Instead, it reads the external and static symbols and puts them in partial | |
372 | symbol tables. When more extensive information is requested of a | |
373 | file, the corresponding partial symbol table is mutated into a full | |
374 | fledged symbol table by going back and reading the symbols | |
346168a2 JG |
375 | for real. |
376 | ||
377 | We look for sections with specific names, to tell us what debug | |
378 | format to look for: FIXME!!! | |
379 | ||
380 | dwarf_build_psymtabs() builds psymtabs for DWARF symbols; | |
381 | elfstab_build_psymtabs() handles STABS symbols. | |
a7446af6 FF |
382 | |
383 | Note that ELF files have a "minimal" symbol table, which looks a lot | |
384 | like a COFF symbol table, but has only the minimal information necessary | |
346168a2 JG |
385 | for linking. We process this also, and use the information to |
386 | build gdb's minimal symbol table. This gives us some minimal debugging | |
387 | capability even for files compiled without -g. */ | |
35f5886e FF |
388 | |
389 | static void | |
2670f34d | 390 | elf_symfile_read (objfile, section_offsets, mainline) |
80d68b1d | 391 | struct objfile *objfile; |
2670f34d | 392 | struct section_offsets *section_offsets; |
1ab3bf1b | 393 | int mainline; |
35f5886e | 394 | { |
80d68b1d | 395 | bfd *abfd = objfile->obfd; |
35f5886e | 396 | struct elfinfo ei; |
a7446af6 | 397 | struct cleanup *back_to; |
346168a2 | 398 | CORE_ADDR offset; |
35f5886e | 399 | |
1ab3bf1b JG |
400 | init_minimal_symbol_collection (); |
401 | back_to = make_cleanup (discard_minimal_symbols, 0); | |
a7446af6 | 402 | |
2670f34d | 403 | memset ((char *) &ei, 0, sizeof (ei)); |
6b801388 | 404 | |
2670f34d JG |
405 | /* Allocate struct to keep track of the symfile */ |
406 | objfile->sym_private = (PTR) | |
407 | xmmalloc (objfile -> md, sizeof (struct dbx_symfile_info)); | |
408 | memset ((char *) objfile->sym_private, 0, sizeof (struct dbx_symfile_info)); | |
409 | make_cleanup (free_elfinfo, (PTR) objfile); | |
6b801388 | 410 | |
2670f34d JG |
411 | /* Process the normal ELF symbol table first. This may write some |
412 | chain of info into the dbx_symfile_info in objfile->sym_private, | |
413 | which can later be used by elfstab_offset_sections. */ | |
a7446af6 | 414 | |
2670f34d JG |
415 | /* FIXME, should take a section_offsets param, not just an offset. */ |
416 | offset = ANOFFSET (section_offsets, 0); | |
346168a2 | 417 | elf_symtab_read (abfd, offset, objfile); |
a7446af6 | 418 | |
346168a2 | 419 | /* Now process debugging information, which is contained in |
a7446af6 FF |
420 | special ELF sections. We first have to find them... */ |
421 | ||
1ab3bf1b | 422 | bfd_map_over_sections (abfd, elf_locate_sections, (PTR) &ei); |
35f5886e FF |
423 | if (ei.dboffset && ei.lnoffset) |
424 | { | |
346168a2 | 425 | /* DWARF sections */ |
d5931d79 | 426 | dwarf_build_psymtabs (objfile, |
2670f34d | 427 | section_offsets, mainline, |
35f5886e | 428 | ei.dboffset, ei.dbsize, |
d5931d79 | 429 | ei.lnoffset, ei.lnsize); |
35f5886e | 430 | } |
346168a2 JG |
431 | if (ei.stabsect) |
432 | { | |
433 | /* STABS sections */ | |
434 | ||
435 | /* FIXME: Sun didn't really know how to implement this well. | |
436 | They made .stab sections that don't point to the .stabstr | |
437 | section with the sh_link field. BFD doesn't make string table | |
438 | sections visible to the caller. So we have to search the | |
439 | ELF section table, not the BFD section table, for the string | |
440 | table. */ | |
2084a176 | 441 | struct elf32_internal_shdr *elf_sect; |
346168a2 | 442 | |
2084a176 | 443 | elf_sect = bfd_elf32_find_section (abfd, ".stabstr"); |
346168a2 JG |
444 | if (elf_sect) |
445 | elfstab_build_psymtabs (objfile, | |
2670f34d | 446 | section_offsets, |
346168a2 JG |
447 | mainline, |
448 | ei.stabsect->filepos, /* .stab offset */ | |
449 | bfd_get_section_size_before_reloc (ei.stabsect),/* .stab size */ | |
d5931d79 | 450 | (file_ptr) elf_sect->sh_offset, /* .stabstr offset */ |
346168a2 JG |
451 | elf_sect->sh_size); /* .stabstr size */ |
452 | } | |
a7446af6 | 453 | |
1ab3bf1b | 454 | if (!have_partial_symbols ()) |
35f5886e FF |
455 | { |
456 | wrap_here (""); | |
457 | printf_filtered ("(no debugging symbols found)..."); | |
458 | wrap_here (""); | |
459 | } | |
a7446af6 | 460 | |
1ab3bf1b JG |
461 | /* Install any minimal symbols that have been collected as the current |
462 | minimal symbols for this objfile. */ | |
463 | ||
80d68b1d | 464 | install_minimal_symbols (objfile); |
1ab3bf1b | 465 | |
a7446af6 | 466 | do_cleanups (back_to); |
35f5886e FF |
467 | } |
468 | ||
2670f34d JG |
469 | /* This cleans up the objfile's sym_private pointer, and the chain of |
470 | stab_section_info's, that might be dangling from it. */ | |
471 | ||
472 | static void | |
473 | free_elfinfo (objp) | |
474 | PTR objp; | |
475 | { | |
476 | struct objfile *objfile = (struct objfile *)objp; | |
477 | struct dbx_symfile_info *dbxinfo = (struct dbx_symfile_info *) | |
478 | objfile->sym_private; | |
479 | struct stab_section_info *ssi, *nssi; | |
480 | ||
481 | ssi = dbxinfo->stab_section_info; | |
482 | while (ssi) | |
483 | { | |
484 | nssi = ssi->next; | |
485 | mfree (objfile->md, ssi); | |
486 | ssi = nssi; | |
487 | } | |
488 | ||
489 | dbxinfo->stab_section_info = 0; /* Just say No mo info about this. */ | |
490 | } | |
491 | ||
492 | ||
35f5886e FF |
493 | /* Initialize anything that needs initializing when a completely new symbol |
494 | file is specified (not just adding some symbols from another file, e.g. a | |
495 | shared library). | |
496 | ||
346168a2 | 497 | We reinitialize buildsym, since we may be reading stabs from an ELF file. */ |
35f5886e FF |
498 | |
499 | static void | |
be772100 JG |
500 | elf_new_init (ignore) |
501 | struct objfile *ignore; | |
80d68b1d | 502 | { |
d07734e3 | 503 | stabsread_new_init (); |
80d68b1d FF |
504 | buildsym_new_init (); |
505 | } | |
506 | ||
507 | /* Perform any local cleanups required when we are done with a particular | |
508 | objfile. I.E, we are in the process of discarding all symbol information | |
509 | for an objfile, freeing up all memory held for it, and unlinking the | |
510 | objfile struct from the global list of known objfiles. */ | |
511 | ||
512 | static void | |
513 | elf_symfile_finish (objfile) | |
514 | struct objfile *objfile; | |
35f5886e | 515 | { |
80d68b1d FF |
516 | if (objfile -> sym_private != NULL) |
517 | { | |
518 | mfree (objfile -> md, objfile -> sym_private); | |
519 | } | |
35f5886e FF |
520 | } |
521 | ||
522 | /* ELF specific initialization routine for reading symbols. | |
523 | ||
524 | It is passed a pointer to a struct sym_fns which contains, among other | |
525 | things, the BFD for the file whose symbols are being read, and a slot for | |
526 | a pointer to "private data" which we can fill with goodies. | |
527 | ||
528 | For now at least, we have nothing in particular to do, so this function is | |
529 | just a stub. */ | |
530 | ||
531 | static void | |
be772100 JG |
532 | elf_symfile_init (ignore) |
533 | struct objfile *ignore; | |
35f5886e FF |
534 | { |
535 | } | |
536 | ||
2670f34d JG |
537 | /* ELF specific parsing routine for section offsets. |
538 | ||
539 | Plain and simple for now. */ | |
540 | ||
541 | static | |
542 | struct section_offsets * | |
543 | elf_symfile_offsets (objfile, addr) | |
544 | struct objfile *objfile; | |
545 | CORE_ADDR addr; | |
546 | { | |
547 | struct section_offsets *section_offsets; | |
548 | int i; | |
549 | ||
550 | section_offsets = (struct section_offsets *) | |
551 | obstack_alloc (&objfile -> psymbol_obstack, | |
552 | sizeof (struct section_offsets) + | |
553 | sizeof (section_offsets->offsets) * (SECT_OFF_MAX-1)); | |
554 | ||
555 | for (i = 0; i < SECT_OFF_MAX; i++) | |
556 | ANOFFSET (section_offsets, i) = addr; | |
557 | ||
558 | return section_offsets; | |
559 | } | |
560 | \f | |
561 | /* When handling an ELF file that contains Sun STABS debug info, | |
562 | some of the debug info is relative to the particular chunk of the | |
563 | section that was generated in its individual .o file. E.g. | |
564 | offsets to static variables are relative to the start of the data | |
565 | segment *for that module before linking*. This information is | |
566 | painfully squirreled away in the ELF symbol table as local symbols | |
567 | with wierd names. Go get 'em when needed. */ | |
568 | ||
569 | void | |
570 | elfstab_offset_sections (objfile, pst) | |
571 | struct objfile *objfile; | |
572 | struct partial_symtab *pst; | |
573 | { | |
574 | char *filename = pst->filename; | |
575 | struct dbx_symfile_info *dbx = (struct dbx_symfile_info *) | |
576 | objfile->sym_private; | |
577 | struct stab_section_info *maybe = dbx->stab_section_info; | |
578 | struct stab_section_info *questionable = 0; | |
579 | int i; | |
580 | char *p; | |
581 | ||
582 | /* The ELF symbol info doesn't include path names, so strip the path | |
583 | (if any) from the psymtab filename. */ | |
584 | while (0 != (p = strchr (filename, '/'))) | |
585 | filename = p+1; | |
586 | ||
587 | /* FIXME: This linear search could speed up significantly | |
588 | if it was chained in the right order to match how we search it, | |
589 | and if we unchained when we found a match. */ | |
590 | for (; maybe; maybe = maybe->next) | |
591 | { | |
592 | if (filename[0] == maybe->filename[0] | |
2e4964ad | 593 | && STREQ (filename, maybe->filename)) |
2670f34d JG |
594 | { |
595 | /* We found a match. But there might be several source files | |
596 | (from different directories) with the same name. */ | |
597 | if (0 == maybe->found) | |
598 | break; | |
599 | questionable = maybe; /* Might use it later. */ | |
600 | } | |
601 | } | |
602 | ||
603 | if (maybe == 0 && questionable != 0) | |
604 | { | |
605 | complain (&stab_info_questionable_complaint, filename); | |
606 | maybe = questionable; | |
607 | } | |
608 | ||
609 | if (maybe) | |
610 | { | |
611 | /* Found it! Allocate a new psymtab struct, and fill it in. */ | |
612 | maybe->found++; | |
613 | pst->section_offsets = (struct section_offsets *) | |
614 | obstack_alloc (&objfile -> psymbol_obstack, | |
615 | sizeof (struct section_offsets) + | |
616 | sizeof (pst->section_offsets->offsets) * (SECT_OFF_MAX-1)); | |
617 | ||
618 | for (i = 0; i < SECT_OFF_MAX; i++) | |
619 | ANOFFSET (pst->section_offsets, i) = maybe->sections[i]; | |
620 | return; | |
621 | } | |
622 | ||
623 | /* We were unable to find any offsets for this file. Complain. */ | |
624 | if (dbx->stab_section_info) /* If there *is* any info, */ | |
625 | complain (&stab_info_mismatch_complaint, filename); | |
626 | } | |
35f5886e FF |
627 | \f |
628 | /* Register that we are able to handle ELF object file formats and DWARF | |
629 | debugging formats. | |
630 | ||
631 | Unlike other object file formats, where the debugging information format | |
632 | is implied by the object file format, the ELF object file format and the | |
633 | DWARF debugging information format are two distinct, and potentially | |
634 | separate entities. I.E. it is perfectly possible to have ELF objects | |
635 | with debugging formats other than DWARF. And it is conceivable that the | |
636 | DWARF debugging format might be used with another object file format, | |
637 | like COFF, by simply using COFF's custom section feature. | |
638 | ||
639 | GDB, and to a lesser extent BFD, should support the notion of separate | |
640 | object file formats and debugging information formats. For now, we just | |
641 | use "elf" in the same sense as "a.out" or "coff", to imply both the ELF | |
642 | object file format and the DWARF debugging format. */ | |
643 | ||
80d68b1d FF |
644 | static struct sym_fns elf_sym_fns = |
645 | { | |
35f5886e FF |
646 | "elf", /* sym_name: name or name prefix of BFD target type */ |
647 | 3, /* sym_namelen: number of significant sym_name chars */ | |
648 | elf_new_init, /* sym_new_init: init anything gbl to entire symtab */ | |
649 | elf_symfile_init, /* sym_init: read initial info, setup for sym_read() */ | |
650 | elf_symfile_read, /* sym_read: read a symbol file into symtab */ | |
80d68b1d | 651 | elf_symfile_finish, /* sym_finish: finished with file, cleanup */ |
2670f34d | 652 | elf_symfile_offsets, /* sym_offsets: Translate ext. to int. relocation */ |
35f5886e FF |
653 | NULL /* next: pointer to next struct sym_fns */ |
654 | }; | |
655 | ||
656 | void | |
1ab3bf1b | 657 | _initialize_elfread () |
35f5886e FF |
658 | { |
659 | add_symtab_fns (&elf_sym_fns); | |
660 | } |