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" |
2731625a | 29 | #include "stabsread.h" |
2670f34d | 30 | #include "gdb-stabs.h" |
51b80b00 | 31 | #include "complaints.h" |
740b7efa | 32 | #include <string.h> |
2e4964ad | 33 | #include "demangle.h" |
35f5886e | 34 | |
2670f34d JG |
35 | /* The struct elfinfo is available only during ELF symbol table and |
36 | psymtab reading. It is destroyed at the complation of psymtab-reading. | |
37 | It's local to elf_symfile_read. */ | |
38 | ||
35f5886e | 39 | struct elfinfo { |
d5931d79 | 40 | file_ptr dboffset; /* Offset to dwarf debug section */ |
35f5886e | 41 | unsigned int dbsize; /* Size of dwarf debug section */ |
d5931d79 | 42 | file_ptr lnoffset; /* Offset to dwarf line number section */ |
35f5886e | 43 | unsigned int lnsize; /* Size of dwarf line number section */ |
346168a2 JG |
44 | asection *stabsect; /* Section pointer for .stab section */ |
45 | asection *stabindexsect; /* Section pointer for .stab.index section */ | |
35f5886e FF |
46 | }; |
47 | ||
2670f34d JG |
48 | /* Various things we might complain about... */ |
49 | ||
50 | struct complaint section_info_complaint = | |
51 | {"elf/stab section information %s without a preceding file symbol", 0, 0}; | |
52 | ||
53 | struct complaint section_info_dup_complaint = | |
54 | {"duplicated elf/stab section information for %s", 0, 0}; | |
55 | ||
56 | struct complaint stab_info_mismatch_complaint = | |
57 | {"elf/stab section information missing for %s", 0, 0}; | |
58 | ||
59 | struct complaint stab_info_questionable_complaint = | |
60 | {"elf/stab section information questionable for %s", 0, 0}; | |
61 | ||
1ab3bf1b | 62 | static void |
80d68b1d | 63 | elf_symfile_init PARAMS ((struct objfile *)); |
1ab3bf1b JG |
64 | |
65 | static void | |
80d68b1d | 66 | elf_new_init PARAMS ((struct objfile *)); |
1ab3bf1b JG |
67 | |
68 | static void | |
2670f34d | 69 | elf_symfile_read PARAMS ((struct objfile *, struct section_offsets *, int)); |
80d68b1d FF |
70 | |
71 | static void | |
72 | elf_symfile_finish PARAMS ((struct objfile *)); | |
1ab3bf1b JG |
73 | |
74 | static void | |
be772100 | 75 | elf_symtab_read PARAMS ((bfd *, CORE_ADDR, struct objfile *)); |
1ab3bf1b | 76 | |
2670f34d JG |
77 | static void |
78 | free_elfinfo PARAMS ((PTR)); | |
79 | ||
80 | static struct section_offsets * | |
81 | elf_symfile_offsets PARAMS ((struct objfile *, CORE_ADDR)); | |
82 | ||
51b57ded FF |
83 | static void |
84 | record_minimal_symbol_and_info PARAMS ((char *, CORE_ADDR, | |
85 | enum minimal_symbol_type, char *, | |
86 | struct objfile *)); | |
1ab3bf1b JG |
87 | |
88 | static void | |
89 | elf_locate_sections PARAMS ((bfd *, asection *, PTR)); | |
90 | ||
35f5886e FF |
91 | /* We are called once per section from elf_symfile_read. We |
92 | need to examine each section we are passed, check to see | |
93 | if it is something we are interested in processing, and | |
94 | if so, stash away some access information for the section. | |
95 | ||
96 | For now we recognize the dwarf debug information sections and | |
97 | line number sections from matching their section names. The | |
98 | ELF definition is no real help here since it has no direct | |
99 | knowledge of DWARF (by design, so any debugging format can be | |
100 | used). | |
101 | ||
346168a2 JG |
102 | We also recognize the ".stab" sections used by the Sun compilers |
103 | released with Solaris 2. | |
104 | ||
35f5886e FF |
105 | FIXME: The section names should not be hardwired strings. */ |
106 | ||
107 | static void | |
be772100 JG |
108 | elf_locate_sections (ignore_abfd, sectp, eip) |
109 | bfd *ignore_abfd; | |
1ab3bf1b JG |
110 | asection *sectp; |
111 | PTR eip; | |
35f5886e | 112 | { |
1ab3bf1b JG |
113 | register struct elfinfo *ei; |
114 | ||
115 | ei = (struct elfinfo *) eip; | |
35f5886e FF |
116 | if (STREQ (sectp -> name, ".debug")) |
117 | { | |
118 | ei -> dboffset = sectp -> filepos; | |
e5849334 | 119 | ei -> dbsize = bfd_get_section_size_before_reloc (sectp); |
35f5886e FF |
120 | } |
121 | else if (STREQ (sectp -> name, ".line")) | |
122 | { | |
123 | ei -> lnoffset = sectp -> filepos; | |
e5849334 | 124 | ei -> lnsize = bfd_get_section_size_before_reloc (sectp); |
35f5886e | 125 | } |
346168a2 JG |
126 | else if (STREQ (sectp -> name, ".stab")) |
127 | { | |
128 | ei -> stabsect = sectp; | |
129 | } | |
130 | else if (STREQ (sectp -> name, ".stab.index")) | |
131 | { | |
132 | ei -> stabindexsect = sectp; | |
133 | } | |
35f5886e FF |
134 | } |
135 | ||
1ab3bf1b JG |
136 | #if 0 /* Currently unused */ |
137 | ||
f8b76e70 | 138 | char * |
1ab3bf1b JG |
139 | elf_interpreter (abfd) |
140 | bfd *abfd; | |
f8b76e70 FF |
141 | { |
142 | sec_ptr interp_sec; | |
143 | unsigned size; | |
144 | char *interp = NULL; | |
145 | ||
146 | interp_sec = bfd_get_section_by_name (abfd, ".interp"); | |
147 | if (interp_sec) | |
148 | { | |
149 | size = bfd_section_size (abfd, interp_sec); | |
150 | interp = alloca (size); | |
151 | if (bfd_get_section_contents (abfd, interp_sec, interp, (file_ptr)0, | |
152 | size)) | |
153 | { | |
154 | interp = savestring (interp, size - 1); | |
155 | } | |
156 | else | |
157 | { | |
158 | interp = NULL; | |
159 | } | |
160 | } | |
161 | return (interp); | |
162 | } | |
163 | ||
1ab3bf1b JG |
164 | #endif |
165 | ||
346168a2 JG |
166 | static void |
167 | record_minimal_symbol_and_info (name, address, ms_type, info, objfile) | |
168 | char *name; | |
169 | CORE_ADDR address; | |
170 | enum minimal_symbol_type ms_type; | |
171 | char *info; /* FIXME, is this really char *? */ | |
172 | struct objfile *objfile; | |
173 | { | |
174 | name = obsavestring (name, strlen (name), &objfile -> symbol_obstack); | |
3c02636b | 175 | prim_record_minimal_symbol_and_info (name, address, ms_type, info, -1); |
346168a2 JG |
176 | } |
177 | ||
f8b76e70 FF |
178 | /* |
179 | ||
180 | LOCAL FUNCTION | |
181 | ||
182 | elf_symtab_read -- read the symbol table of an ELF file | |
183 | ||
184 | SYNOPSIS | |
185 | ||
be772100 | 186 | void elf_symtab_read (bfd *abfd, CORE_ADDR addr, |
1ab3bf1b | 187 | struct objfile *objfile) |
f8b76e70 FF |
188 | |
189 | DESCRIPTION | |
190 | ||
191 | Given an open bfd, a base address to relocate symbols to, and a | |
192 | flag that specifies whether or not this bfd is for an executable | |
193 | or not (may be shared library for example), add all the global | |
1ab3bf1b | 194 | function and data symbols to the minimal symbol table. |
f8b76e70 | 195 | |
2670f34d JG |
196 | In stabs-in-ELF, as implemented by Sun, there are some local symbols |
197 | defined in the ELF symbol table, which can be used to locate | |
198 | the beginnings of sections from each ".o" file that was linked to | |
199 | form the executable objfile. We gather any such info and record it | |
200 | in data structures hung off the objfile's private data. | |
201 | ||
f8b76e70 FF |
202 | */ |
203 | ||
a7446af6 | 204 | static void |
be772100 | 205 | elf_symtab_read (abfd, addr, objfile) |
1ab3bf1b JG |
206 | bfd *abfd; |
207 | CORE_ADDR addr; | |
1ab3bf1b | 208 | struct objfile *objfile; |
a7446af6 FF |
209 | { |
210 | unsigned int storage_needed; | |
211 | asymbol *sym; | |
212 | asymbol **symbol_table; | |
213 | unsigned int number_of_symbols; | |
214 | unsigned int i; | |
2670f34d | 215 | int index; |
a7446af6 | 216 | struct cleanup *back_to; |
f8b76e70 | 217 | CORE_ADDR symaddr; |
1ab3bf1b | 218 | enum minimal_symbol_type ms_type; |
6c8f91a1 | 219 | /* If sectinfo is nonNULL, it contains section info that should end up |
2670f34d | 220 | filed in the objfile. */ |
6c8f91a1 | 221 | struct stab_section_info *sectinfo = NULL; |
2670f34d JG |
222 | /* If filesym is nonzero, it points to a file symbol, but we haven't |
223 | seen any section info for it yet. */ | |
224 | asymbol *filesym = 0; | |
225 | struct dbx_symfile_info *dbx = (struct dbx_symfile_info *) | |
226 | objfile->sym_private; | |
6c8f91a1 | 227 | unsigned long size; |
a7446af6 FF |
228 | |
229 | storage_needed = get_symtab_upper_bound (abfd); | |
a7446af6 FF |
230 | if (storage_needed > 0) |
231 | { | |
3b0b9220 | 232 | symbol_table = (asymbol **) xmalloc (storage_needed); |
a7446af6 FF |
233 | back_to = make_cleanup (free, symbol_table); |
234 | number_of_symbols = bfd_canonicalize_symtab (abfd, symbol_table); | |
a7446af6 FF |
235 | for (i = 0; i < number_of_symbols; i++) |
236 | { | |
2670f34d | 237 | sym = symbol_table[i]; |
6c8f91a1 | 238 | if (sym -> name == NULL || *sym -> name == '\0') |
379dd965 | 239 | { |
6c8f91a1 FF |
240 | /* Skip names that don't exist (shouldn't happen), or names |
241 | that are null strings (may happen). */ | |
379dd965 FF |
242 | continue; |
243 | } | |
6c8f91a1 FF |
244 | if (sym -> flags & BSF_FILE) |
245 | { | |
246 | /* STT_FILE debugging symbol that helps stabs-in-elf debugging. | |
247 | Chain any old one onto the objfile; remember new sym. */ | |
248 | if (sectinfo != NULL) | |
249 | { | |
250 | sectinfo -> next = dbx -> stab_section_info; | |
251 | dbx -> stab_section_info = sectinfo; | |
252 | sectinfo = NULL; | |
253 | } | |
254 | filesym = sym; | |
255 | } | |
256 | else if (sym -> flags & (BSF_GLOBAL | BSF_LOCAL | BSF_WEAK)) | |
a7446af6 | 257 | { |
6c8f91a1 FF |
258 | /* Select global/local/weak symbols. Note that bfd puts abs |
259 | symbols in their own section, so all symbols we are | |
260 | interested in will have a section. */ | |
a608f919 FF |
261 | /* Bfd symbols are section relative. */ |
262 | symaddr = sym -> value + sym -> section -> vma; | |
c2e4669f JG |
263 | /* Relocate all non-absolute symbols by base address. */ |
264 | if (sym -> section != &bfd_abs_section) | |
6c8f91a1 FF |
265 | { |
266 | symaddr += addr; | |
267 | } | |
f8b76e70 FF |
268 | /* For non-absolute symbols, use the type of the section |
269 | they are relative to, to intuit text/data. Bfd provides | |
270 | no way of figuring this out for absolute symbols. */ | |
6c8f91a1 FF |
271 | if (sym -> section == &bfd_abs_section) |
272 | { | |
273 | ms_type = mst_abs; | |
274 | } | |
275 | else if (sym -> section -> flags & SEC_CODE) | |
f8b76e70 | 276 | { |
379dd965 FF |
277 | if (sym -> flags & BSF_GLOBAL) |
278 | { | |
279 | ms_type = mst_text; | |
280 | } | |
5ec3ba25 | 281 | else if (sym->name[0] == '.' && sym->name[1] == 'L') |
bbf1ff10 JK |
282 | /* Looks like a compiler-generated label. Skip it. |
283 | The assembler should be skipping these (to keep | |
284 | executables small), but apparently with gcc on the | |
285 | delta m88k SVR4, it loses. So to have us check too | |
286 | should be harmless (but I encourage people to fix this | |
287 | in the assembler instead of adding checks here). */ | |
5ec3ba25 | 288 | continue; |
379dd965 FF |
289 | else |
290 | { | |
291 | ms_type = mst_file_text; | |
292 | } | |
f8b76e70 | 293 | } |
d35bf52d | 294 | else if (sym -> section -> flags & SEC_DATA) |
f8b76e70 | 295 | { |
379dd965 FF |
296 | if (sym -> flags & BSF_GLOBAL) |
297 | { | |
298 | if (sym -> section -> flags & SEC_HAS_CONTENTS) | |
299 | { | |
300 | ms_type = mst_data; | |
301 | } | |
302 | else | |
303 | { | |
304 | ms_type = mst_bss; | |
305 | } | |
306 | } | |
6c8f91a1 | 307 | else if (sym -> flags & BSF_LOCAL) |
379dd965 | 308 | { |
6c8f91a1 FF |
309 | /* Named Local variable in a Data section. Check its |
310 | name for stabs-in-elf. The STREQ macro checks the | |
311 | first character inline, so we only actually do a | |
312 | strcmp function call on names that start with 'B' | |
313 | or 'D' */ | |
314 | index = SECT_OFF_MAX; | |
315 | if (STREQ ("Bbss.bss", sym -> name)) | |
316 | { | |
317 | index = SECT_OFF_BSS; | |
318 | } | |
319 | else if (STREQ ("Ddata.data", sym -> name)) | |
320 | { | |
321 | index = SECT_OFF_DATA; | |
322 | } | |
323 | else if (STREQ ("Drodata.rodata", sym -> name)) | |
324 | { | |
325 | index = SECT_OFF_RODATA; | |
326 | } | |
327 | if (index != SECT_OFF_MAX) | |
328 | { | |
329 | /* Found a special local symbol. Allocate a | |
330 | sectinfo, if needed, and fill it in. */ | |
331 | if (sectinfo == NULL) | |
332 | { | |
333 | sectinfo = (struct stab_section_info *) | |
334 | xmmalloc (objfile -> md, sizeof (*sectinfo)); | |
335 | memset ((PTR) sectinfo, 0, sizeof (*sectinfo)); | |
336 | if (filesym == NULL) | |
337 | { | |
338 | complain (§ion_info_complaint, | |
339 | sym -> name); | |
340 | } | |
341 | else | |
342 | { | |
343 | sectinfo -> filename = | |
344 | (char *) filesym -> name; | |
345 | } | |
346 | } | |
347 | if (sectinfo -> sections[index] != 0) | |
348 | { | |
349 | complain (§ion_info_dup_complaint, | |
350 | sectinfo -> filename); | |
351 | } | |
352 | /* Bfd symbols are section relative. */ | |
353 | symaddr = sym -> value + sym -> section -> vma; | |
354 | /* Relocate non-absolute symbols by base address. */ | |
355 | if (sym -> section != &bfd_abs_section) | |
356 | { | |
357 | symaddr += addr; | |
358 | } | |
359 | sectinfo -> sections[index] = symaddr; | |
360 | /* The special local symbols don't go in the | |
361 | minimal symbol table, so ignore this one. */ | |
362 | continue; | |
363 | } | |
364 | /* Not a special stabs-in-elf symbol, do regular | |
365 | symbol processing. */ | |
379dd965 FF |
366 | if (sym -> section -> flags & SEC_HAS_CONTENTS) |
367 | { | |
368 | ms_type = mst_file_data; | |
369 | } | |
370 | else | |
371 | { | |
372 | ms_type = mst_file_bss; | |
373 | } | |
374 | } | |
6c8f91a1 FF |
375 | else |
376 | { | |
377 | ms_type = mst_unknown; | |
378 | } | |
f8b76e70 FF |
379 | } |
380 | else | |
381 | { | |
4c7c6bab JG |
382 | /* FIXME: Solaris2 shared libraries include lots of |
383 | odd "absolute" and "undefined" symbols, that play | |
384 | hob with actions like finding what function the PC | |
379dd965 | 385 | is in. Ignore them if they aren't text, data, or bss. */ |
4c7c6bab JG |
386 | /* ms_type = mst_unknown; */ |
387 | continue; /* Skip this symbol. */ | |
f8b76e70 | 388 | } |
346168a2 | 389 | /* Pass symbol size field in via BFD. FIXME!!! */ |
538b2068 | 390 | size = ((elf_symbol_type *) sym) -> internal_elf_sym.st_size; |
6c8f91a1 FF |
391 | record_minimal_symbol_and_info ((char *) sym -> name, symaddr, |
392 | ms_type, (PTR) size, objfile); | |
2670f34d | 393 | } |
a7446af6 FF |
394 | } |
395 | do_cleanups (back_to); | |
396 | } | |
397 | } | |
398 | ||
35f5886e FF |
399 | /* Scan and build partial symbols for a symbol file. |
400 | We have been initialized by a call to elf_symfile_init, which | |
401 | currently does nothing. | |
402 | ||
2670f34d JG |
403 | SECTION_OFFSETS is a set of offsets to apply to relocate the symbols |
404 | in each section. We simplify it down to a single offset for all | |
405 | symbols. FIXME. | |
35f5886e FF |
406 | |
407 | MAINLINE is true if we are reading the main symbol | |
408 | table (as opposed to a shared lib or dynamically loaded file). | |
409 | ||
410 | This function only does the minimum work necessary for letting the | |
411 | user "name" things symbolically; it does not read the entire symtab. | |
412 | Instead, it reads the external and static symbols and puts them in partial | |
413 | symbol tables. When more extensive information is requested of a | |
414 | file, the corresponding partial symbol table is mutated into a full | |
415 | fledged symbol table by going back and reading the symbols | |
346168a2 JG |
416 | for real. |
417 | ||
418 | We look for sections with specific names, to tell us what debug | |
419 | format to look for: FIXME!!! | |
420 | ||
421 | dwarf_build_psymtabs() builds psymtabs for DWARF symbols; | |
422 | elfstab_build_psymtabs() handles STABS symbols. | |
a7446af6 FF |
423 | |
424 | Note that ELF files have a "minimal" symbol table, which looks a lot | |
425 | like a COFF symbol table, but has only the minimal information necessary | |
346168a2 JG |
426 | for linking. We process this also, and use the information to |
427 | build gdb's minimal symbol table. This gives us some minimal debugging | |
428 | capability even for files compiled without -g. */ | |
35f5886e FF |
429 | |
430 | static void | |
2670f34d | 431 | elf_symfile_read (objfile, section_offsets, mainline) |
80d68b1d | 432 | struct objfile *objfile; |
2670f34d | 433 | struct section_offsets *section_offsets; |
1ab3bf1b | 434 | int mainline; |
35f5886e | 435 | { |
80d68b1d | 436 | bfd *abfd = objfile->obfd; |
35f5886e | 437 | struct elfinfo ei; |
a7446af6 | 438 | struct cleanup *back_to; |
346168a2 | 439 | CORE_ADDR offset; |
35f5886e | 440 | |
1ab3bf1b JG |
441 | init_minimal_symbol_collection (); |
442 | back_to = make_cleanup (discard_minimal_symbols, 0); | |
a7446af6 | 443 | |
2670f34d | 444 | memset ((char *) &ei, 0, sizeof (ei)); |
6b801388 | 445 | |
2670f34d JG |
446 | /* Allocate struct to keep track of the symfile */ |
447 | objfile->sym_private = (PTR) | |
448 | xmmalloc (objfile -> md, sizeof (struct dbx_symfile_info)); | |
449 | memset ((char *) objfile->sym_private, 0, sizeof (struct dbx_symfile_info)); | |
450 | make_cleanup (free_elfinfo, (PTR) objfile); | |
6b801388 | 451 | |
2670f34d JG |
452 | /* Process the normal ELF symbol table first. This may write some |
453 | chain of info into the dbx_symfile_info in objfile->sym_private, | |
454 | which can later be used by elfstab_offset_sections. */ | |
a7446af6 | 455 | |
2670f34d JG |
456 | /* FIXME, should take a section_offsets param, not just an offset. */ |
457 | offset = ANOFFSET (section_offsets, 0); | |
346168a2 | 458 | elf_symtab_read (abfd, offset, objfile); |
a7446af6 | 459 | |
346168a2 | 460 | /* Now process debugging information, which is contained in |
a7446af6 FF |
461 | special ELF sections. We first have to find them... */ |
462 | ||
1ab3bf1b | 463 | bfd_map_over_sections (abfd, elf_locate_sections, (PTR) &ei); |
35f5886e FF |
464 | if (ei.dboffset && ei.lnoffset) |
465 | { | |
346168a2 | 466 | /* DWARF sections */ |
d5931d79 | 467 | dwarf_build_psymtabs (objfile, |
2670f34d | 468 | section_offsets, mainline, |
35f5886e | 469 | ei.dboffset, ei.dbsize, |
d5931d79 | 470 | ei.lnoffset, ei.lnsize); |
35f5886e | 471 | } |
346168a2 JG |
472 | if (ei.stabsect) |
473 | { | |
474 | /* STABS sections */ | |
475 | ||
476 | /* FIXME: Sun didn't really know how to implement this well. | |
477 | They made .stab sections that don't point to the .stabstr | |
478 | section with the sh_link field. BFD doesn't make string table | |
479 | sections visible to the caller. So we have to search the | |
480 | ELF section table, not the BFD section table, for the string | |
481 | table. */ | |
2084a176 | 482 | struct elf32_internal_shdr *elf_sect; |
346168a2 | 483 | |
872dd3fe | 484 | elf_sect = bfd_elf_find_section (abfd, ".stabstr"); |
346168a2 JG |
485 | if (elf_sect) |
486 | elfstab_build_psymtabs (objfile, | |
2670f34d | 487 | section_offsets, |
346168a2 JG |
488 | mainline, |
489 | ei.stabsect->filepos, /* .stab offset */ | |
490 | bfd_get_section_size_before_reloc (ei.stabsect),/* .stab size */ | |
d5931d79 | 491 | (file_ptr) elf_sect->sh_offset, /* .stabstr offset */ |
346168a2 JG |
492 | elf_sect->sh_size); /* .stabstr size */ |
493 | } | |
a7446af6 | 494 | |
1ab3bf1b | 495 | if (!have_partial_symbols ()) |
35f5886e FF |
496 | { |
497 | wrap_here (""); | |
498 | printf_filtered ("(no debugging symbols found)..."); | |
499 | wrap_here (""); | |
500 | } | |
a7446af6 | 501 | |
1ab3bf1b JG |
502 | /* Install any minimal symbols that have been collected as the current |
503 | minimal symbols for this objfile. */ | |
504 | ||
80d68b1d | 505 | install_minimal_symbols (objfile); |
1ab3bf1b | 506 | |
a7446af6 | 507 | do_cleanups (back_to); |
35f5886e FF |
508 | } |
509 | ||
2670f34d JG |
510 | /* This cleans up the objfile's sym_private pointer, and the chain of |
511 | stab_section_info's, that might be dangling from it. */ | |
512 | ||
513 | static void | |
514 | free_elfinfo (objp) | |
515 | PTR objp; | |
516 | { | |
517 | struct objfile *objfile = (struct objfile *)objp; | |
518 | struct dbx_symfile_info *dbxinfo = (struct dbx_symfile_info *) | |
519 | objfile->sym_private; | |
520 | struct stab_section_info *ssi, *nssi; | |
521 | ||
522 | ssi = dbxinfo->stab_section_info; | |
523 | while (ssi) | |
524 | { | |
525 | nssi = ssi->next; | |
526 | mfree (objfile->md, ssi); | |
527 | ssi = nssi; | |
528 | } | |
529 | ||
530 | dbxinfo->stab_section_info = 0; /* Just say No mo info about this. */ | |
531 | } | |
532 | ||
533 | ||
35f5886e FF |
534 | /* Initialize anything that needs initializing when a completely new symbol |
535 | file is specified (not just adding some symbols from another file, e.g. a | |
536 | shared library). | |
537 | ||
346168a2 | 538 | We reinitialize buildsym, since we may be reading stabs from an ELF file. */ |
35f5886e FF |
539 | |
540 | static void | |
be772100 JG |
541 | elf_new_init (ignore) |
542 | struct objfile *ignore; | |
80d68b1d | 543 | { |
d07734e3 | 544 | stabsread_new_init (); |
80d68b1d FF |
545 | buildsym_new_init (); |
546 | } | |
547 | ||
548 | /* Perform any local cleanups required when we are done with a particular | |
549 | objfile. I.E, we are in the process of discarding all symbol information | |
550 | for an objfile, freeing up all memory held for it, and unlinking the | |
551 | objfile struct from the global list of known objfiles. */ | |
552 | ||
553 | static void | |
554 | elf_symfile_finish (objfile) | |
555 | struct objfile *objfile; | |
35f5886e | 556 | { |
80d68b1d FF |
557 | if (objfile -> sym_private != NULL) |
558 | { | |
559 | mfree (objfile -> md, objfile -> sym_private); | |
560 | } | |
35f5886e FF |
561 | } |
562 | ||
563 | /* ELF specific initialization routine for reading symbols. | |
564 | ||
565 | It is passed a pointer to a struct sym_fns which contains, among other | |
566 | things, the BFD for the file whose symbols are being read, and a slot for | |
567 | a pointer to "private data" which we can fill with goodies. | |
568 | ||
569 | For now at least, we have nothing in particular to do, so this function is | |
570 | just a stub. */ | |
571 | ||
572 | static void | |
be772100 JG |
573 | elf_symfile_init (ignore) |
574 | struct objfile *ignore; | |
35f5886e FF |
575 | { |
576 | } | |
577 | ||
2670f34d JG |
578 | /* ELF specific parsing routine for section offsets. |
579 | ||
580 | Plain and simple for now. */ | |
581 | ||
582 | static | |
583 | struct section_offsets * | |
584 | elf_symfile_offsets (objfile, addr) | |
585 | struct objfile *objfile; | |
586 | CORE_ADDR addr; | |
587 | { | |
588 | struct section_offsets *section_offsets; | |
589 | int i; | |
590 | ||
591 | section_offsets = (struct section_offsets *) | |
592 | obstack_alloc (&objfile -> psymbol_obstack, | |
593 | sizeof (struct section_offsets) + | |
594 | sizeof (section_offsets->offsets) * (SECT_OFF_MAX-1)); | |
595 | ||
596 | for (i = 0; i < SECT_OFF_MAX; i++) | |
597 | ANOFFSET (section_offsets, i) = addr; | |
598 | ||
599 | return section_offsets; | |
600 | } | |
601 | \f | |
602 | /* When handling an ELF file that contains Sun STABS debug info, | |
603 | some of the debug info is relative to the particular chunk of the | |
604 | section that was generated in its individual .o file. E.g. | |
605 | offsets to static variables are relative to the start of the data | |
606 | segment *for that module before linking*. This information is | |
607 | painfully squirreled away in the ELF symbol table as local symbols | |
608 | with wierd names. Go get 'em when needed. */ | |
609 | ||
610 | void | |
611 | elfstab_offset_sections (objfile, pst) | |
612 | struct objfile *objfile; | |
613 | struct partial_symtab *pst; | |
614 | { | |
615 | char *filename = pst->filename; | |
616 | struct dbx_symfile_info *dbx = (struct dbx_symfile_info *) | |
617 | objfile->sym_private; | |
618 | struct stab_section_info *maybe = dbx->stab_section_info; | |
619 | struct stab_section_info *questionable = 0; | |
620 | int i; | |
621 | char *p; | |
622 | ||
623 | /* The ELF symbol info doesn't include path names, so strip the path | |
624 | (if any) from the psymtab filename. */ | |
625 | while (0 != (p = strchr (filename, '/'))) | |
626 | filename = p+1; | |
627 | ||
628 | /* FIXME: This linear search could speed up significantly | |
629 | if it was chained in the right order to match how we search it, | |
630 | and if we unchained when we found a match. */ | |
631 | for (; maybe; maybe = maybe->next) | |
632 | { | |
633 | if (filename[0] == maybe->filename[0] | |
2e4964ad | 634 | && STREQ (filename, maybe->filename)) |
2670f34d JG |
635 | { |
636 | /* We found a match. But there might be several source files | |
637 | (from different directories) with the same name. */ | |
638 | if (0 == maybe->found) | |
639 | break; | |
640 | questionable = maybe; /* Might use it later. */ | |
641 | } | |
642 | } | |
643 | ||
644 | if (maybe == 0 && questionable != 0) | |
645 | { | |
646 | complain (&stab_info_questionable_complaint, filename); | |
647 | maybe = questionable; | |
648 | } | |
649 | ||
650 | if (maybe) | |
651 | { | |
652 | /* Found it! Allocate a new psymtab struct, and fill it in. */ | |
653 | maybe->found++; | |
654 | pst->section_offsets = (struct section_offsets *) | |
655 | obstack_alloc (&objfile -> psymbol_obstack, | |
656 | sizeof (struct section_offsets) + | |
657 | sizeof (pst->section_offsets->offsets) * (SECT_OFF_MAX-1)); | |
658 | ||
659 | for (i = 0; i < SECT_OFF_MAX; i++) | |
660 | ANOFFSET (pst->section_offsets, i) = maybe->sections[i]; | |
661 | return; | |
662 | } | |
663 | ||
664 | /* We were unable to find any offsets for this file. Complain. */ | |
665 | if (dbx->stab_section_info) /* If there *is* any info, */ | |
666 | complain (&stab_info_mismatch_complaint, filename); | |
667 | } | |
35f5886e FF |
668 | \f |
669 | /* Register that we are able to handle ELF object file formats and DWARF | |
670 | debugging formats. | |
671 | ||
672 | Unlike other object file formats, where the debugging information format | |
673 | is implied by the object file format, the ELF object file format and the | |
674 | DWARF debugging information format are two distinct, and potentially | |
675 | separate entities. I.E. it is perfectly possible to have ELF objects | |
676 | with debugging formats other than DWARF. And it is conceivable that the | |
677 | DWARF debugging format might be used with another object file format, | |
678 | like COFF, by simply using COFF's custom section feature. | |
679 | ||
680 | GDB, and to a lesser extent BFD, should support the notion of separate | |
681 | object file formats and debugging information formats. For now, we just | |
682 | use "elf" in the same sense as "a.out" or "coff", to imply both the ELF | |
683 | object file format and the DWARF debugging format. */ | |
684 | ||
80d68b1d FF |
685 | static struct sym_fns elf_sym_fns = |
686 | { | |
35f5886e FF |
687 | "elf", /* sym_name: name or name prefix of BFD target type */ |
688 | 3, /* sym_namelen: number of significant sym_name chars */ | |
689 | elf_new_init, /* sym_new_init: init anything gbl to entire symtab */ | |
690 | elf_symfile_init, /* sym_init: read initial info, setup for sym_read() */ | |
691 | elf_symfile_read, /* sym_read: read a symbol file into symtab */ | |
80d68b1d | 692 | elf_symfile_finish, /* sym_finish: finished with file, cleanup */ |
2670f34d | 693 | elf_symfile_offsets, /* sym_offsets: Translate ext. to int. relocation */ |
35f5886e FF |
694 | NULL /* next: pointer to next struct sym_fns */ |
695 | }; | |
696 | ||
697 | void | |
1ab3bf1b | 698 | _initialize_elfread () |
35f5886e FF |
699 | { |
700 | add_symtab_fns (&elf_sym_fns); | |
701 | } |