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1ab3bf1b JG |
1 | /* GDB routines for manipulating objfiles. |
2 | Copyright 1992 Free Software Foundation, Inc. | |
3 | Contributed by Cygnus Support, using pieces from other GDB modules. | |
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 | /* This file contains support routines for creating, manipulating, and | |
22 | destroying objfile structures. */ | |
23 | ||
1ab3bf1b JG |
24 | #include "defs.h" |
25 | #include "bfd.h" /* Binary File Description */ | |
26 | #include "symtab.h" | |
27 | #include "symfile.h" | |
5e2e79f8 | 28 | #include "objfiles.h" |
1ab3bf1b | 29 | |
318bf84f FF |
30 | #include <sys/types.h> |
31 | #include <sys/stat.h> | |
32 | #include <fcntl.h> | |
1ab3bf1b JG |
33 | #include <obstack.h> |
34 | ||
318bf84f FF |
35 | /* Prototypes for local functions */ |
36 | ||
1867b3be FF |
37 | #if !defined(NO_MMALLOC) && defined(HAVE_MMAP) |
38 | ||
39 | static int | |
40 | open_existing_mapped_file PARAMS ((char *, long, int)); | |
41 | ||
318bf84f | 42 | static int |
b0246b3b | 43 | open_mapped_file PARAMS ((char *filename, long mtime, int mapped)); |
318bf84f FF |
44 | |
45 | static CORE_ADDR | |
46 | map_to_address PARAMS ((void)); | |
47 | ||
1867b3be FF |
48 | #endif /* !defined(NO_MMALLOC) && defined(HAVE_MMAP) */ |
49 | ||
50 | /* Message to be printed before the error message, when an error occurs. */ | |
51 | ||
52 | extern char *error_pre_print; | |
53 | ||
5e2e79f8 FF |
54 | /* Externally visible variables that are owned by this module. |
55 | See declarations in objfile.h for more info. */ | |
1ab3bf1b JG |
56 | |
57 | struct objfile *object_files; /* Linked list of all objfiles */ | |
5e2e79f8 FF |
58 | struct objfile *current_objfile; /* For symbol file being read in */ |
59 | struct objfile *symfile_objfile; /* Main symbol table loaded from */ | |
60 | ||
318bf84f | 61 | int mapped_symbol_files; /* Try to use mapped symbol files */ |
1ab3bf1b | 62 | |
73d0fc78 RP |
63 | /* Locate all mappable sections of a BFD file. |
64 | objfile_p_char is a char * to get it through | |
65 | bfd_map_over_sections; we cast it back to its proper type. */ | |
66 | ||
67 | static void | |
68 | add_to_objfile_sections (abfd, asect, objfile_p_char) | |
69 | bfd *abfd; | |
70 | sec_ptr asect; | |
71 | PTR objfile_p_char; | |
72 | { | |
73 | struct objfile *objfile = (struct objfile *) objfile_p_char; | |
74 | struct obj_section section; | |
75 | flagword aflag; | |
76 | ||
77 | aflag = bfd_get_section_flags (abfd, asect); | |
78 | /* FIXME, we need to handle BSS segment here...it alloc's but doesn't load */ | |
79 | if (!(aflag & SEC_LOAD)) | |
80 | return; | |
81 | if (0 == bfd_section_size (abfd, asect)) | |
82 | return; | |
83 | section.offset = 0; | |
84 | section.sec_ptr = asect; | |
85 | section.addr = bfd_section_vma (abfd, asect); | |
86 | section.endaddr = section.addr + bfd_section_size (abfd, asect); | |
87 | obstack_grow (&objfile->psymbol_obstack, §ion, sizeof(section)); | |
88 | objfile->sections_end = (struct obj_section *) (((int) objfile->sections_end) + 1); | |
89 | } | |
90 | ||
91 | /* Builds a section table for OBJFILE. | |
92 | Returns 0 if OK, 1 on error. */ | |
93 | ||
94 | static int | |
95 | build_objfile_section_table (objfile) | |
96 | struct objfile *objfile; | |
97 | { | |
98 | if (objfile->sections) | |
99 | abort(); | |
100 | ||
101 | objfile->sections_end = 0; | |
102 | bfd_map_over_sections (objfile->obfd, add_to_objfile_sections, (char *)objfile); | |
ccd87bf2 JK |
103 | objfile->sections = (struct obj_section *) |
104 | obstack_finish (&objfile->psymbol_obstack); | |
73d0fc78 RP |
105 | objfile->sections_end = objfile->sections + (int) objfile->sections_end; |
106 | return(0); | |
107 | } | |
108 | ||
b0246b3b FF |
109 | /* Given a pointer to an initialized bfd (ABFD) and a flag that indicates |
110 | whether or not an objfile is to be mapped (MAPPED), allocate a new objfile | |
111 | struct, fill it in as best we can, link it into the list of all known | |
112 | objfiles, and return a pointer to the new objfile struct. */ | |
1ab3bf1b JG |
113 | |
114 | struct objfile * | |
b0246b3b | 115 | allocate_objfile (abfd, mapped) |
1ab3bf1b | 116 | bfd *abfd; |
318bf84f | 117 | int mapped; |
1ab3bf1b | 118 | { |
318bf84f FF |
119 | struct objfile *objfile = NULL; |
120 | int fd; | |
121 | void *md; | |
122 | CORE_ADDR mapto; | |
123 | ||
124 | mapped |= mapped_symbol_files; | |
125 | ||
126 | #if !defined(NO_MMALLOC) && defined(HAVE_MMAP) | |
127 | ||
128 | /* If we can support mapped symbol files, try to open/reopen the mapped file | |
129 | that corresponds to the file from which we wish to read symbols. If the | |
130 | objfile is to be mapped, we must malloc the structure itself using the | |
131 | mmap version, and arrange that all memory allocation for the objfile uses | |
132 | the mmap routines. If we are reusing an existing mapped file, from which | |
133 | we get our objfile pointer, we have to make sure that we update the | |
134 | pointers to the alloc/free functions in the obstack, in case these | |
135 | functions have moved within the current gdb. */ | |
136 | ||
b0246b3b FF |
137 | fd = open_mapped_file (bfd_get_filename (abfd), bfd_get_mtime (abfd), |
138 | mapped); | |
318bf84f FF |
139 | if (fd >= 0) |
140 | { | |
b0246b3b | 141 | if (((mapto = map_to_address ()) == 0) || |
318bf84f FF |
142 | ((md = mmalloc_attach (fd, (void *) mapto)) == NULL)) |
143 | { | |
4ed3a9ea | 144 | close (fd); |
318bf84f FF |
145 | } |
146 | else if ((objfile = (struct objfile *) mmalloc_getkey (md, 0)) != NULL) | |
147 | { | |
3624c875 FF |
148 | /* Update memory corruption handler function addresses. */ |
149 | init_malloc (md); | |
318bf84f | 150 | objfile -> md = md; |
2d6d969c | 151 | objfile -> mmfd = fd; |
318bf84f FF |
152 | /* Update pointers to functions to *our* copies */ |
153 | obstack_chunkfun (&objfile -> psymbol_obstack, xmmalloc); | |
154 | obstack_freefun (&objfile -> psymbol_obstack, mfree); | |
155 | obstack_chunkfun (&objfile -> symbol_obstack, xmmalloc); | |
156 | obstack_freefun (&objfile -> symbol_obstack, mfree); | |
157 | obstack_chunkfun (&objfile -> type_obstack, xmmalloc); | |
158 | obstack_freefun (&objfile -> type_obstack, mfree); | |
6c316cfd FF |
159 | /* If already in objfile list, unlink it. */ |
160 | unlink_objfile (objfile); | |
161 | /* Forget things specific to a particular gdb, may have changed. */ | |
162 | objfile -> sf = NULL; | |
318bf84f FF |
163 | } |
164 | else | |
165 | { | |
3624c875 FF |
166 | /* Set up to detect internal memory corruption. MUST be done before |
167 | the first malloc. See comments in init_malloc() and mmcheck(). */ | |
168 | init_malloc (md); | |
318bf84f | 169 | objfile = (struct objfile *) xmmalloc (md, sizeof (struct objfile)); |
4ed3a9ea | 170 | memset (objfile, 0, sizeof (struct objfile)); |
318bf84f | 171 | objfile -> md = md; |
2d6d969c | 172 | objfile -> mmfd = fd; |
318bf84f FF |
173 | objfile -> flags |= OBJF_MAPPED; |
174 | mmalloc_setkey (objfile -> md, 0, objfile); | |
cd46ffad FF |
175 | obstack_specify_allocation_with_arg (&objfile -> psymbol_obstack, |
176 | 0, 0, xmmalloc, mfree, | |
177 | objfile -> md); | |
178 | obstack_specify_allocation_with_arg (&objfile -> symbol_obstack, | |
179 | 0, 0, xmmalloc, mfree, | |
180 | objfile -> md); | |
181 | obstack_specify_allocation_with_arg (&objfile -> type_obstack, | |
182 | 0, 0, xmmalloc, mfree, | |
183 | objfile -> md); | |
318bf84f FF |
184 | } |
185 | } | |
186 | ||
187 | if (mapped && (objfile == NULL)) | |
188 | { | |
b0246b3b FF |
189 | warning ("symbol table for '%s' will not be mapped", |
190 | bfd_get_filename (abfd)); | |
318bf84f | 191 | } |
1ab3bf1b | 192 | |
318bf84f | 193 | #else /* defined(NO_MMALLOC) || !defined(HAVE_MMAP) */ |
1ab3bf1b | 194 | |
318bf84f | 195 | if (mapped) |
1ab3bf1b | 196 | { |
318bf84f FF |
197 | warning ("this version of gdb does not support mapped symbol tables."); |
198 | ||
199 | /* Turn off the global flag so we don't try to do mapped symbol tables | |
200 | any more, which shuts up gdb unless the user specifically gives the | |
201 | "mapped" keyword again. */ | |
202 | ||
203 | mapped_symbol_files = 0; | |
1ab3bf1b | 204 | } |
318bf84f FF |
205 | |
206 | #endif /* !defined(NO_MMALLOC) && defined(HAVE_MMAP) */ | |
207 | ||
208 | /* If we don't support mapped symbol files, didn't ask for the file to be | |
209 | mapped, or failed to open the mapped file for some reason, then revert | |
210 | back to an unmapped objfile. */ | |
211 | ||
212 | if (objfile == NULL) | |
1ab3bf1b JG |
213 | { |
214 | objfile = (struct objfile *) xmalloc (sizeof (struct objfile)); | |
4ed3a9ea | 215 | memset (objfile, 0, sizeof (struct objfile)); |
318bf84f | 216 | objfile -> md = NULL; |
cd46ffad FF |
217 | obstack_specify_allocation (&objfile -> psymbol_obstack, 0, 0, xmalloc, |
218 | free); | |
219 | obstack_specify_allocation (&objfile -> symbol_obstack, 0, 0, xmalloc, | |
220 | free); | |
221 | obstack_specify_allocation (&objfile -> type_obstack, 0, 0, xmalloc, | |
222 | free); | |
1ab3bf1b JG |
223 | } |
224 | ||
b0246b3b FF |
225 | /* Update the per-objfile information that comes from the bfd, ensuring |
226 | that any data that is reference is saved in the per-objfile data | |
227 | region. */ | |
1ab3bf1b JG |
228 | |
229 | objfile -> obfd = abfd; | |
2d6d969c FF |
230 | if (objfile -> name != NULL) |
231 | { | |
232 | mfree (objfile -> md, objfile -> name); | |
233 | } | |
b0246b3b | 234 | objfile -> name = mstrsave (objfile -> md, bfd_get_filename (abfd)); |
1ab3bf1b JG |
235 | objfile -> mtime = bfd_get_mtime (abfd); |
236 | ||
73d0fc78 RP |
237 | /* Build section table. */ |
238 | ||
239 | if (build_objfile_section_table (objfile)) | |
240 | { | |
241 | error ("Can't find the file sections in `%s': %s", | |
242 | objfile -> name, bfd_errmsg (bfd_error)); | |
243 | } | |
244 | ||
1ab3bf1b JG |
245 | /* Push this file onto the head of the linked list of other such files. */ |
246 | ||
247 | objfile -> next = object_files; | |
248 | object_files = objfile; | |
249 | ||
250 | return (objfile); | |
251 | } | |
252 | ||
6c316cfd FF |
253 | /* Unlink OBJFILE from the list of known objfiles, if it is found in the |
254 | list. | |
255 | ||
256 | It is not a bug, or error, to call this function if OBJFILE is not known | |
257 | to be in the current list. This is done in the case of mapped objfiles, | |
258 | for example, just to ensure that the mapped objfile doesn't appear twice | |
259 | in the list. Since the list is threaded, linking in a mapped objfile | |
260 | twice would create a circular list. | |
261 | ||
262 | If OBJFILE turns out to be in the list, we zap it's NEXT pointer after | |
263 | unlinking it, just to ensure that we have completely severed any linkages | |
264 | between the OBJFILE and the list. */ | |
265 | ||
266 | void | |
267 | unlink_objfile (objfile) | |
268 | struct objfile *objfile; | |
269 | { | |
270 | struct objfile** objpp; | |
271 | ||
272 | for (objpp = &object_files; *objpp != NULL; objpp = &((*objpp) -> next)) | |
273 | { | |
274 | if (*objpp == objfile) | |
275 | { | |
276 | *objpp = (*objpp) -> next; | |
277 | objfile -> next = NULL; | |
278 | break; | |
279 | } | |
280 | } | |
281 | } | |
282 | ||
1ab3bf1b JG |
283 | |
284 | /* Destroy an objfile and all the symtabs and psymtabs under it. Note | |
285 | that as much as possible is allocated on the symbol_obstack and | |
80d68b1d FF |
286 | psymbol_obstack, so that the memory can be efficiently freed. |
287 | ||
288 | Things which we do NOT free because they are not in malloc'd memory | |
289 | or not in memory specific to the objfile include: | |
290 | ||
291 | objfile -> sf | |
292 | ||
2d6d969c FF |
293 | FIXME: If the objfile is using reusable symbol information (via mmalloc), |
294 | then we need to take into account the fact that more than one process | |
295 | may be using the symbol information at the same time (when mmalloc is | |
296 | extended to support cooperative locking). When more than one process | |
297 | is using the mapped symbol info, we need to be more careful about when | |
298 | we free objects in the reusable area. */ | |
1ab3bf1b JG |
299 | |
300 | void | |
301 | free_objfile (objfile) | |
302 | struct objfile *objfile; | |
303 | { | |
2d6d969c FF |
304 | int mmfd; |
305 | ||
306 | /* First do any symbol file specific actions required when we are | |
307 | finished with a particular symbol file. Note that if the objfile | |
308 | is using reusable symbol information (via mmalloc) then each of | |
309 | these routines is responsible for doing the correct thing, either | |
310 | freeing things which are valid only during this particular gdb | |
311 | execution, or leaving them to be reused during the next one. */ | |
1ab3bf1b | 312 | |
80d68b1d FF |
313 | if (objfile -> sf != NULL) |
314 | { | |
315 | (*objfile -> sf -> sym_finish) (objfile); | |
316 | } | |
2d6d969c FF |
317 | |
318 | /* We always close the bfd. */ | |
319 | ||
80d68b1d | 320 | if (objfile -> obfd != NULL) |
1ab3bf1b | 321 | { |
346168a2 | 322 | char *name = bfd_get_filename (objfile->obfd); |
1ab3bf1b | 323 | bfd_close (objfile -> obfd); |
346168a2 | 324 | free (name); |
1ab3bf1b JG |
325 | } |
326 | ||
2d6d969c | 327 | /* Remove it from the chain of all objfiles. */ |
1ab3bf1b | 328 | |
6c316cfd | 329 | unlink_objfile (objfile); |
1ab3bf1b | 330 | |
1ab3bf1b JG |
331 | /* Before the symbol table code was redone to make it easier to |
332 | selectively load and remove information particular to a specific | |
333 | linkage unit, gdb used to do these things whenever the monolithic | |
334 | symbol table was blown away. How much still needs to be done | |
335 | is unknown, but we play it safe for now and keep each action until | |
336 | it is shown to be no longer needed. */ | |
337 | ||
338 | clear_symtab_users_once (); | |
339 | #if defined (CLEAR_SOLIB) | |
340 | CLEAR_SOLIB (); | |
341 | #endif | |
342 | clear_pc_function_cache (); | |
343 | ||
2d6d969c FF |
344 | /* The last thing we do is free the objfile struct itself for the |
345 | non-reusable case, or detach from the mapped file for the reusable | |
346 | case. Note that the mmalloc_detach or the mfree is the last thing | |
347 | we can do with this objfile. */ | |
1ab3bf1b | 348 | |
55b3ef9a FF |
349 | #if !defined(NO_MMALLOC) && defined(HAVE_MMAP) |
350 | ||
2d6d969c FF |
351 | if (objfile -> flags & OBJF_MAPPED) |
352 | { | |
353 | /* Remember the fd so we can close it. We can't close it before | |
354 | doing the detach, and after the detach the objfile is gone. */ | |
355 | mmfd = objfile -> mmfd; | |
356 | mmalloc_detach (objfile -> md); | |
55b3ef9a | 357 | objfile = NULL; |
4ed3a9ea | 358 | close (mmfd); |
2d6d969c | 359 | } |
55b3ef9a FF |
360 | |
361 | #endif /* !defined(NO_MMALLOC) && defined(HAVE_MMAP) */ | |
362 | ||
363 | /* If we still have an objfile, then either we don't support reusable | |
364 | objfiles or this one was not reusable. So free it normally. */ | |
365 | ||
366 | if (objfile != NULL) | |
2d6d969c FF |
367 | { |
368 | if (objfile -> name != NULL) | |
369 | { | |
370 | mfree (objfile -> md, objfile -> name); | |
371 | } | |
346168a2 JG |
372 | if (objfile->global_psymbols.list) |
373 | mfree (objfile->md, objfile->global_psymbols.list); | |
374 | if (objfile->static_psymbols.list) | |
375 | mfree (objfile->md, objfile->static_psymbols.list); | |
2d6d969c FF |
376 | /* Free the obstacks for non-reusable objfiles */ |
377 | obstack_free (&objfile -> psymbol_obstack, 0); | |
378 | obstack_free (&objfile -> symbol_obstack, 0); | |
379 | obstack_free (&objfile -> type_obstack, 0); | |
380 | mfree (objfile -> md, objfile); | |
55b3ef9a | 381 | objfile = NULL; |
2d6d969c | 382 | } |
1ab3bf1b JG |
383 | } |
384 | ||
cba0d141 JG |
385 | |
386 | /* Free all the object files at once. */ | |
387 | ||
388 | void | |
389 | free_all_objfiles () | |
390 | { | |
391 | struct objfile *objfile, *temp; | |
392 | ||
393 | ALL_OBJFILES_SAFE (objfile, temp) | |
394 | { | |
395 | free_objfile (objfile); | |
396 | } | |
397 | } | |
3c02636b JK |
398 | \f |
399 | /* Relocate OBJFILE to NEW_OFFSETS. There should be OBJFILE->NUM_SECTIONS | |
400 | entries in new_offsets. */ | |
401 | void | |
402 | objfile_relocate (objfile, new_offsets) | |
403 | struct objfile *objfile; | |
404 | struct section_offsets *new_offsets; | |
405 | { | |
406 | struct section_offsets *delta = (struct section_offsets *) alloca | |
407 | (sizeof (struct section_offsets) | |
408 | + objfile->num_sections * sizeof (delta->offsets)); | |
409 | ||
410 | { | |
411 | int i; | |
412 | int something_changed = 0; | |
413 | for (i = 0; i < objfile->num_sections; ++i) | |
414 | { | |
415 | ANOFFSET (delta, i) = | |
416 | ANOFFSET (new_offsets, i) - ANOFFSET (objfile->section_offsets, i); | |
417 | if (ANOFFSET (delta, i) != 0) | |
418 | something_changed = 1; | |
419 | } | |
420 | if (!something_changed) | |
421 | return; | |
422 | } | |
423 | ||
424 | /* OK, get all the symtabs. */ | |
425 | { | |
426 | struct symtab *s; | |
427 | ||
428 | for (s = objfile->symtabs; s; s = s->next) | |
429 | { | |
430 | struct linetable *l; | |
431 | struct blockvector *bv; | |
432 | int i; | |
433 | ||
434 | /* First the line table. */ | |
435 | l = LINETABLE (s); | |
436 | if (l) | |
437 | { | |
438 | for (i = 0; i < l->nitems; ++i) | |
439 | l->item[i].pc += ANOFFSET (delta, s->block_line_section); | |
440 | } | |
441 | ||
442 | /* Don't relocate a shared blockvector more than once. */ | |
443 | if (!s->primary) | |
444 | continue; | |
445 | ||
446 | bv = BLOCKVECTOR (s); | |
447 | for (i = 0; i < BLOCKVECTOR_NBLOCKS (bv); ++i) | |
448 | { | |
449 | struct block *b; | |
450 | int j; | |
451 | ||
452 | b = BLOCKVECTOR_BLOCK (bv, i); | |
453 | BLOCK_START (b) += ANOFFSET (delta, s->block_line_section); | |
454 | BLOCK_END (b) += ANOFFSET (delta, s->block_line_section); | |
455 | ||
456 | for (j = 0; j < BLOCK_NSYMS (b); ++j) | |
457 | { | |
458 | struct symbol *sym = BLOCK_SYM (b, j); | |
459 | /* The RS6000 code from which this was taken skipped | |
460 | any symbols in STRUCT_NAMESPACE or UNDEF_NAMESPACE. | |
461 | But I'm leaving out that test, on the theory that | |
462 | they can't possibly pass the tests below. */ | |
463 | if ((SYMBOL_CLASS (sym) == LOC_LABEL | |
464 | || SYMBOL_CLASS (sym) == LOC_STATIC) | |
465 | && SYMBOL_SECTION (sym) >= 0) | |
466 | { | |
467 | SYMBOL_VALUE_ADDRESS (sym) += | |
468 | ANOFFSET (delta, SYMBOL_SECTION (sym)); | |
469 | } | |
470 | } | |
471 | } | |
472 | } | |
473 | } | |
474 | ||
475 | { | |
476 | struct minimal_symbol *msym; | |
477 | ALL_OBJFILE_MSYMBOLS (objfile, msym) | |
478 | SYMBOL_VALUE_ADDRESS (msym) += ANOFFSET (delta, SYMBOL_SECTION (msym)); | |
479 | } | |
480 | ||
481 | { | |
482 | int i; | |
483 | for (i = 0; i < objfile->num_sections; ++i) | |
484 | ANOFFSET (objfile->section_offsets, i) = ANOFFSET (new_offsets, i); | |
485 | } | |
486 | } | |
487 | \f | |
1ab3bf1b JG |
488 | /* Many places in gdb want to test just to see if we have any partial |
489 | symbols available. This function returns zero if none are currently | |
490 | available, nonzero otherwise. */ | |
491 | ||
492 | int | |
493 | have_partial_symbols () | |
494 | { | |
495 | struct objfile *ofp; | |
1ab3bf1b | 496 | |
84ffdec2 | 497 | ALL_OBJFILES (ofp) |
1ab3bf1b JG |
498 | { |
499 | if (ofp -> psymtabs != NULL) | |
500 | { | |
84ffdec2 | 501 | return 1; |
1ab3bf1b JG |
502 | } |
503 | } | |
84ffdec2 | 504 | return 0; |
1ab3bf1b JG |
505 | } |
506 | ||
507 | /* Many places in gdb want to test just to see if we have any full | |
508 | symbols available. This function returns zero if none are currently | |
509 | available, nonzero otherwise. */ | |
510 | ||
511 | int | |
512 | have_full_symbols () | |
513 | { | |
514 | struct objfile *ofp; | |
1ab3bf1b | 515 | |
84ffdec2 | 516 | ALL_OBJFILES (ofp) |
1ab3bf1b JG |
517 | { |
518 | if (ofp -> symtabs != NULL) | |
519 | { | |
84ffdec2 | 520 | return 1; |
1ab3bf1b JG |
521 | } |
522 | } | |
84ffdec2 | 523 | return 0; |
1ab3bf1b JG |
524 | } |
525 | ||
526 | /* Many places in gdb want to test just to see if we have any minimal | |
527 | symbols available. This function returns zero if none are currently | |
528 | available, nonzero otherwise. */ | |
529 | ||
530 | int | |
531 | have_minimal_symbols () | |
532 | { | |
533 | struct objfile *ofp; | |
1ab3bf1b | 534 | |
84ffdec2 | 535 | ALL_OBJFILES (ofp) |
1ab3bf1b JG |
536 | { |
537 | if (ofp -> msymbols != NULL) | |
538 | { | |
84ffdec2 | 539 | return 1; |
1ab3bf1b JG |
540 | } |
541 | } | |
84ffdec2 | 542 | return 0; |
1ab3bf1b JG |
543 | } |
544 | ||
1867b3be FF |
545 | #if !defined(NO_MMALLOC) && defined(HAVE_MMAP) |
546 | ||
547 | /* Given the name of a mapped symbol file in SYMSFILENAME, and the timestamp | |
548 | of the corresponding symbol file in MTIME, try to open an existing file | |
549 | with the name SYMSFILENAME and verify it is more recent than the base | |
550 | file by checking it's timestamp against MTIME. | |
551 | ||
552 | If SYMSFILENAME does not exist (or can't be stat'd), simply returns -1. | |
553 | ||
554 | If SYMSFILENAME does exist, but is out of date, we check to see if the | |
555 | user has specified creation of a mapped file. If so, we don't issue | |
556 | any warning message because we will be creating a new mapped file anyway, | |
557 | overwriting the old one. If not, then we issue a warning message so that | |
558 | the user will know why we aren't using this existing mapped symbol file. | |
559 | In either case, we return -1. | |
560 | ||
561 | If SYMSFILENAME does exist and is not out of date, but can't be opened for | |
562 | some reason, then prints an appropriate system error message and returns -1. | |
563 | ||
564 | Otherwise, returns the open file descriptor. */ | |
565 | ||
566 | static int | |
567 | open_existing_mapped_file (symsfilename, mtime, mapped) | |
568 | char *symsfilename; | |
569 | long mtime; | |
570 | int mapped; | |
571 | { | |
572 | int fd = -1; | |
573 | struct stat sbuf; | |
574 | ||
575 | if (stat (symsfilename, &sbuf) == 0) | |
576 | { | |
577 | if (sbuf.st_mtime < mtime) | |
578 | { | |
579 | if (!mapped) | |
580 | { | |
a679650f FF |
581 | warning ("mapped symbol file `%s' is out of date, ignored it", |
582 | symsfilename); | |
1867b3be FF |
583 | } |
584 | } | |
585 | else if ((fd = open (symsfilename, O_RDWR)) < 0) | |
586 | { | |
587 | if (error_pre_print) | |
588 | { | |
589 | printf (error_pre_print); | |
590 | } | |
591 | print_sys_errmsg (symsfilename, errno); | |
592 | } | |
593 | } | |
594 | return (fd); | |
595 | } | |
596 | ||
b0246b3b | 597 | /* Look for a mapped symbol file that corresponds to FILENAME and is more |
318bf84f | 598 | recent than MTIME. If MAPPED is nonzero, the user has asked that gdb |
b0246b3b FF |
599 | use a mapped symbol file for this file, so create a new one if one does |
600 | not currently exist. | |
318bf84f FF |
601 | |
602 | If found, then return an open file descriptor for the file, otherwise | |
603 | return -1. | |
604 | ||
605 | This routine is responsible for implementing the policy that generates | |
606 | the name of the mapped symbol file from the name of a file containing | |
1867b3be FF |
607 | symbols that gdb would like to read. Currently this policy is to append |
608 | ".syms" to the name of the file. | |
609 | ||
610 | This routine is also responsible for implementing the policy that | |
611 | determines where the mapped symbol file is found (the search path). | |
612 | This policy is that when reading an existing mapped file, a file of | |
613 | the correct name in the current directory takes precedence over a | |
614 | file of the correct name in the same directory as the symbol file. | |
615 | When creating a new mapped file, it is always created in the current | |
616 | directory. This helps to minimize the chances of a user unknowingly | |
617 | creating big mapped files in places like /bin and /usr/local/bin, and | |
618 | allows a local copy to override a manually installed global copy (in | |
619 | /bin for example). */ | |
318bf84f FF |
620 | |
621 | static int | |
b0246b3b FF |
622 | open_mapped_file (filename, mtime, mapped) |
623 | char *filename; | |
318bf84f FF |
624 | long mtime; |
625 | int mapped; | |
626 | { | |
627 | int fd; | |
1867b3be | 628 | char *symsfilename; |
318bf84f | 629 | |
1867b3be FF |
630 | /* First try to open an existing file in the current directory, and |
631 | then try the directory where the symbol file is located. */ | |
318bf84f | 632 | |
1867b3be FF |
633 | symsfilename = concat ("./", basename (filename), ".syms", (char *) NULL); |
634 | if ((fd = open_existing_mapped_file (symsfilename, mtime, mapped)) < 0) | |
318bf84f | 635 | { |
1867b3be FF |
636 | free (symsfilename); |
637 | symsfilename = concat (filename, ".syms", (char *) NULL); | |
638 | fd = open_existing_mapped_file (symsfilename, mtime, mapped); | |
318bf84f FF |
639 | } |
640 | ||
1867b3be FF |
641 | /* If we don't have an open file by now, then either the file does not |
642 | already exist, or the base file has changed since it was created. In | |
643 | either case, if the user has specified use of a mapped file, then | |
644 | create a new mapped file, truncating any existing one. If we can't | |
645 | create one, print a system error message saying why we can't. | |
318bf84f FF |
646 | |
647 | By default the file is rw for everyone, with the user's umask taking | |
648 | care of turning off the permissions the user wants off. */ | |
649 | ||
1867b3be | 650 | if ((fd < 0) && mapped) |
318bf84f | 651 | { |
1867b3be FF |
652 | free (symsfilename); |
653 | symsfilename = concat ("./", basename (filename), ".syms", | |
654 | (char *) NULL); | |
655 | if ((fd = open (symsfilename, O_RDWR | O_CREAT | O_TRUNC, 0666)) < 0) | |
656 | { | |
657 | if (error_pre_print) | |
658 | { | |
659 | printf (error_pre_print); | |
660 | } | |
661 | print_sys_errmsg (symsfilename, errno); | |
662 | } | |
318bf84f FF |
663 | } |
664 | ||
1867b3be | 665 | free (symsfilename); |
318bf84f FF |
666 | return (fd); |
667 | } | |
668 | ||
669 | /* Return the base address at which we would like the next objfile's | |
670 | mapped data to start. | |
671 | ||
672 | For now, we use the kludge that the configuration specifies a base | |
673 | address to which it is safe to map the first mmalloc heap, and an | |
674 | increment to add to this address for each successive heap. There are | |
675 | a lot of issues to deal with here to make this work reasonably, including: | |
676 | ||
677 | Avoid memory collisions with existing mapped address spaces | |
678 | ||
679 | Reclaim address spaces when their mmalloc heaps are unmapped | |
680 | ||
681 | When mmalloc heaps are shared between processes they have to be | |
682 | mapped at the same addresses in each | |
683 | ||
684 | Once created, a mmalloc heap that is to be mapped back in must be | |
685 | mapped at the original address. I.E. each objfile will expect to | |
686 | be remapped at it's original address. This becomes a problem if | |
687 | the desired address is already in use. | |
688 | ||
689 | etc, etc, etc. | |
690 | ||
691 | */ | |
692 | ||
693 | ||
694 | static CORE_ADDR | |
695 | map_to_address () | |
696 | { | |
697 | ||
698 | #if defined(MMAP_BASE_ADDRESS) && defined (MMAP_INCREMENT) | |
699 | ||
700 | static CORE_ADDR next = MMAP_BASE_ADDRESS; | |
701 | CORE_ADDR mapto = next; | |
702 | ||
703 | next += MMAP_INCREMENT; | |
704 | return (mapto); | |
705 | ||
706 | #else | |
707 | ||
708 | return (0); | |
709 | ||
710 | #endif | |
711 | ||
712 | } | |
1867b3be FF |
713 | |
714 | #endif /* !defined(NO_MMALLOC) && defined(HAVE_MMAP) */ | |
73d0fc78 RP |
715 | |
716 | /* Returns a section whose range includes PC or NULL if none found. */ | |
717 | ||
718 | sec_ptr | |
719 | find_pc_section(pc) | |
720 | CORE_ADDR pc; | |
721 | { | |
722 | struct obj_section *s; | |
723 | struct objfile *objfile; | |
724 | ||
725 | ALL_OBJFILES (objfile) | |
726 | for (s = objfile->sections; s < objfile->sections_end; ++s) | |
727 | if (s->addr <= pc | |
728 | && pc < s->endaddr) | |
729 | return(s->sec_ptr); | |
730 | ||
731 | return(NULL); | |
732 | } |