Commit | Line | Data |
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c906108c SS |
1 | /* Handle SunOS and SVR4 shared libraries for GDB, the GNU Debugger. |
2 | Copyright 1990, 91, 92, 93, 94, 95, 96, 98, 1999 | |
3 | Free Software Foundation, Inc. | |
c906108c | 4 | |
c5aa993b | 5 | This file is part of GDB. |
c906108c | 6 | |
c5aa993b JM |
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. | |
c906108c | 11 | |
c5aa993b JM |
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., 59 Temple Place - Suite 330, | |
20 | Boston, MA 02111-1307, USA. */ | |
c906108c SS |
21 | |
22 | ||
23 | #include "defs.h" | |
24 | ||
25 | /* This file is only compilable if link.h is available. */ | |
26 | ||
27 | #ifdef HAVE_LINK_H | |
28 | ||
29 | #include <sys/types.h> | |
30 | #include <signal.h> | |
31 | #include "gdb_string.h" | |
32 | #include <sys/param.h> | |
33 | #include <fcntl.h> | |
c906108c SS |
34 | |
35 | #ifndef SVR4_SHARED_LIBS | |
36 | /* SunOS shared libs need the nlist structure. */ | |
c5aa993b | 37 | #include <a.out.h> |
c906108c SS |
38 | #else |
39 | #include "elf/external.h" | |
40 | #endif | |
41 | ||
42 | #include <link.h> | |
43 | ||
44 | #include "symtab.h" | |
45 | #include "bfd.h" | |
46 | #include "symfile.h" | |
47 | #include "objfiles.h" | |
48 | #include "gdbcore.h" | |
49 | #include "command.h" | |
50 | #include "target.h" | |
51 | #include "frame.h" | |
88987551 | 52 | #include "gdb_regex.h" |
c906108c SS |
53 | #include "inferior.h" |
54 | #include "environ.h" | |
55 | #include "language.h" | |
56 | #include "gdbcmd.h" | |
57 | ||
c5aa993b | 58 | #define MAX_PATH_SIZE 512 /* FIXME: Should be dynamic */ |
c906108c SS |
59 | |
60 | /* On SVR4 systems, a list of symbols in the dynamic linker where | |
61 | GDB can try to place a breakpoint to monitor shared library | |
62 | events. | |
63 | ||
64 | If none of these symbols are found, or other errors occur, then | |
65 | SVR4 systems will fall back to using a symbol as the "startup | |
66 | mapping complete" breakpoint address. */ | |
67 | ||
68 | #ifdef SVR4_SHARED_LIBS | |
c5aa993b JM |
69 | static char *solib_break_names[] = |
70 | { | |
c906108c SS |
71 | "r_debug_state", |
72 | "_r_debug_state", | |
73 | "_dl_debug_state", | |
74 | "rtld_db_dlactivity", | |
75 | NULL | |
76 | }; | |
77 | #endif | |
78 | ||
79 | #define BKPT_AT_SYMBOL 1 | |
80 | ||
81 | #if defined (BKPT_AT_SYMBOL) && defined (SVR4_SHARED_LIBS) | |
c5aa993b JM |
82 | static char *bkpt_names[] = |
83 | { | |
c906108c SS |
84 | #ifdef SOLIB_BKPT_NAME |
85 | SOLIB_BKPT_NAME, /* Prefer configured name if it exists. */ | |
86 | #endif | |
87 | "_start", | |
88 | "main", | |
89 | NULL | |
90 | }; | |
91 | #endif | |
92 | ||
93 | /* Symbols which are used to locate the base of the link map structures. */ | |
94 | ||
95 | #ifndef SVR4_SHARED_LIBS | |
c5aa993b JM |
96 | static char *debug_base_symbols[] = |
97 | { | |
c906108c SS |
98 | "_DYNAMIC", |
99 | "_DYNAMIC__MGC", | |
100 | NULL | |
101 | }; | |
102 | #endif | |
103 | ||
c5aa993b JM |
104 | static char *main_name_list[] = |
105 | { | |
c906108c SS |
106 | "main_$main", |
107 | NULL | |
108 | }; | |
109 | ||
110 | /* local data declarations */ | |
111 | ||
07cd4b97 JB |
112 | /* Macro to extract an address from a solib structure. |
113 | When GDB is configured for some 32-bit targets (e.g. Solaris 2.7 | |
114 | sparc), BFD is configured to handle 64-bit targets, so CORE_ADDR is | |
115 | 64 bits. We have to extract only the significant bits of addresses | |
116 | to get the right address when accessing the core file BFD. */ | |
117 | ||
118 | #define SOLIB_EXTRACT_ADDRESS(member) \ | |
119 | extract_address (&member, sizeof (member)) | |
120 | ||
c906108c SS |
121 | #ifndef SVR4_SHARED_LIBS |
122 | ||
07cd4b97 JB |
123 | #define LM_ADDR(so) (SOLIB_EXTRACT_ADDRESS ((so) -> lm.lm_addr)) |
124 | #define LM_NEXT(so) (SOLIB_EXTRACT_ADDRESS ((so) -> lm.lm_next)) | |
125 | #define LM_NAME(so) (SOLIB_EXTRACT_ADDRESS ((so) -> lm.lm_name)) | |
c906108c | 126 | /* Test for first link map entry; first entry is a shared library. */ |
07cd4b97 | 127 | #define IGNORE_FIRST_LINK_MAP_ENTRY(so) (0) |
c906108c SS |
128 | static struct link_dynamic dynamic_copy; |
129 | static struct link_dynamic_2 ld_2_copy; | |
130 | static struct ld_debug debug_copy; | |
131 | static CORE_ADDR debug_addr; | |
132 | static CORE_ADDR flag_addr; | |
133 | ||
c5aa993b | 134 | #else /* SVR4_SHARED_LIBS */ |
c906108c | 135 | |
07cd4b97 JB |
136 | #define LM_ADDR(so) (SOLIB_EXTRACT_ADDRESS ((so) -> lm.l_addr)) |
137 | #define LM_NEXT(so) (SOLIB_EXTRACT_ADDRESS ((so) -> lm.l_next)) | |
138 | #define LM_NAME(so) (SOLIB_EXTRACT_ADDRESS ((so) -> lm.l_name)) | |
c906108c | 139 | /* Test for first link map entry; first entry is the exec-file. */ |
07cd4b97 JB |
140 | #define IGNORE_FIRST_LINK_MAP_ENTRY(so) \ |
141 | (SOLIB_EXTRACT_ADDRESS ((so) -> lm.l_prev) == 0) | |
c906108c SS |
142 | static struct r_debug debug_copy; |
143 | char shadow_contents[BREAKPOINT_MAX]; /* Stash old bkpt addr contents */ | |
144 | ||
c5aa993b JM |
145 | #endif /* !SVR4_SHARED_LIBS */ |
146 | ||
147 | struct so_list | |
148 | { | |
07cd4b97 JB |
149 | /* The following fields of the structure come directly from the |
150 | dynamic linker's tables in the inferior, and are initialized by | |
151 | current_sos. */ | |
152 | ||
c5aa993b JM |
153 | struct so_list *next; /* next structure in linked list */ |
154 | struct link_map lm; /* copy of link map from inferior */ | |
07cd4b97 JB |
155 | CORE_ADDR lmaddr; /* addr in inferior lm was read from */ |
156 | ||
157 | /* Shared object file name, exactly as it appears in the | |
158 | inferior's link map. This may be a relative path, or something | |
159 | which needs to be looked up in LD_LIBRARY_PATH, etc. We use it | |
160 | to tell which entries in the inferior's dynamic linker's link | |
161 | map we've already loaded. */ | |
162 | char so_original_name[MAX_PATH_SIZE]; | |
163 | ||
164 | /* shared object file name, expanded to something GDB can open */ | |
165 | char so_name[MAX_PATH_SIZE]; | |
166 | ||
167 | /* The following fields of the structure are built from | |
168 | information gathered from the shared object file itself, and | |
169 | are initialized when we actually add it to our symbol tables. */ | |
170 | ||
171 | bfd *abfd; | |
c5aa993b | 172 | CORE_ADDR lmend; /* upper addr bound of mapped object */ |
c5aa993b JM |
173 | char symbols_loaded; /* flag: symbols read in yet? */ |
174 | char from_tty; /* flag: print msgs? */ | |
175 | struct objfile *objfile; /* objfile for loaded lib */ | |
176 | struct section_table *sections; | |
177 | struct section_table *sections_end; | |
178 | struct section_table *textsection; | |
c5aa993b | 179 | }; |
c906108c SS |
180 | |
181 | static struct so_list *so_list_head; /* List of known shared objects */ | |
c5aa993b | 182 | static CORE_ADDR debug_base; /* Base of dynamic linker structures */ |
c906108c SS |
183 | static CORE_ADDR breakpoint_addr; /* Address where end bkpt is set */ |
184 | ||
c5aa993b | 185 | static int solib_cleanup_queued = 0; /* make_run_cleanup called */ |
c906108c SS |
186 | |
187 | extern int | |
c5aa993b | 188 | fdmatch PARAMS ((int, int)); /* In libiberty */ |
c906108c SS |
189 | |
190 | /* Local function prototypes */ | |
191 | ||
192 | static void | |
193 | do_clear_solib PARAMS ((PTR)); | |
194 | ||
195 | static int | |
196 | match_main PARAMS ((char *)); | |
197 | ||
198 | static void | |
07cd4b97 | 199 | special_symbol_handling PARAMS ((void)); |
c906108c SS |
200 | |
201 | static void | |
202 | sharedlibrary_command PARAMS ((char *, int)); | |
203 | ||
204 | static int | |
205 | enable_break PARAMS ((void)); | |
206 | ||
207 | static void | |
208 | info_sharedlibrary_command PARAMS ((char *, int)); | |
209 | ||
210 | static int symbol_add_stub PARAMS ((PTR)); | |
211 | ||
07cd4b97 | 212 | static CORE_ADDR |
c5aa993b | 213 | first_link_map_member PARAMS ((void)); |
c906108c SS |
214 | |
215 | static CORE_ADDR | |
c5aa993b | 216 | locate_base PARAMS ((void)); |
c906108c SS |
217 | |
218 | static int solib_map_sections PARAMS ((PTR)); | |
219 | ||
220 | #ifdef SVR4_SHARED_LIBS | |
221 | ||
222 | static CORE_ADDR | |
c5aa993b | 223 | elf_locate_base PARAMS ((void)); |
c906108c SS |
224 | |
225 | #else | |
226 | ||
07cd4b97 JB |
227 | static struct so_list *current_sos (void); |
228 | static void free_so (struct so_list *node); | |
229 | ||
c906108c SS |
230 | static int |
231 | disable_break PARAMS ((void)); | |
232 | ||
233 | static void | |
234 | allocate_rt_common_objfile PARAMS ((void)); | |
235 | ||
236 | static void | |
07cd4b97 | 237 | solib_add_common_symbols (CORE_ADDR); |
c906108c SS |
238 | |
239 | #endif | |
240 | ||
241 | void _initialize_solib PARAMS ((void)); | |
242 | ||
243 | /* If non-zero, this is a prefix that will be added to the front of the name | |
244 | shared libraries with an absolute filename for loading. */ | |
245 | static char *solib_absolute_prefix = NULL; | |
246 | ||
247 | /* If non-empty, this is a search path for loading non-absolute shared library | |
248 | symbol files. This takes precedence over the environment variables PATH | |
249 | and LD_LIBRARY_PATH. */ | |
250 | static char *solib_search_path = NULL; | |
251 | ||
252 | /* | |
253 | ||
c5aa993b | 254 | LOCAL FUNCTION |
c906108c | 255 | |
c5aa993b | 256 | solib_map_sections -- open bfd and build sections for shared lib |
c906108c | 257 | |
c5aa993b | 258 | SYNOPSIS |
c906108c | 259 | |
c5aa993b | 260 | static int solib_map_sections (struct so_list *so) |
c906108c | 261 | |
c5aa993b | 262 | DESCRIPTION |
c906108c | 263 | |
c5aa993b JM |
264 | Given a pointer to one of the shared objects in our list |
265 | of mapped objects, use the recorded name to open a bfd | |
266 | descriptor for the object, build a section table, and then | |
267 | relocate all the section addresses by the base address at | |
268 | which the shared object was mapped. | |
c906108c | 269 | |
c5aa993b | 270 | FIXMES |
c906108c | 271 | |
c5aa993b JM |
272 | In most (all?) cases the shared object file name recorded in the |
273 | dynamic linkage tables will be a fully qualified pathname. For | |
274 | cases where it isn't, do we really mimic the systems search | |
275 | mechanism correctly in the below code (particularly the tilde | |
276 | expansion stuff?). | |
c906108c SS |
277 | */ |
278 | ||
279 | static int | |
280 | solib_map_sections (arg) | |
281 | PTR arg; | |
282 | { | |
283 | struct so_list *so = (struct so_list *) arg; /* catch_errors bogon */ | |
284 | char *filename; | |
285 | char *scratch_pathname; | |
286 | int scratch_chan; | |
287 | struct section_table *p; | |
288 | struct cleanup *old_chain; | |
289 | bfd *abfd; | |
c5aa993b JM |
290 | |
291 | filename = tilde_expand (so->so_name); | |
292 | ||
c906108c SS |
293 | if (solib_absolute_prefix && ROOTED_P (filename)) |
294 | /* Prefix shared libraries with absolute filenames with | |
295 | SOLIB_ABSOLUTE_PREFIX. */ | |
296 | { | |
297 | char *pfxed_fn; | |
298 | int pfx_len; | |
299 | ||
300 | pfx_len = strlen (solib_absolute_prefix); | |
301 | ||
302 | /* Remove trailing slashes. */ | |
303 | while (pfx_len > 0 && SLASH_P (solib_absolute_prefix[pfx_len - 1])) | |
304 | pfx_len--; | |
305 | ||
306 | pfxed_fn = xmalloc (pfx_len + strlen (filename) + 1); | |
307 | strcpy (pfxed_fn, solib_absolute_prefix); | |
308 | strcat (pfxed_fn, filename); | |
309 | free (filename); | |
310 | ||
311 | filename = pfxed_fn; | |
312 | } | |
313 | ||
314 | old_chain = make_cleanup (free, filename); | |
315 | ||
316 | scratch_chan = -1; | |
317 | ||
318 | if (solib_search_path) | |
319 | scratch_chan = openp (solib_search_path, | |
320 | 1, filename, O_RDONLY, 0, &scratch_pathname); | |
321 | if (scratch_chan < 0) | |
c5aa993b | 322 | scratch_chan = openp (get_in_environ (inferior_environ, "PATH"), |
c906108c SS |
323 | 1, filename, O_RDONLY, 0, &scratch_pathname); |
324 | if (scratch_chan < 0) | |
325 | { | |
c5aa993b JM |
326 | scratch_chan = openp (get_in_environ |
327 | (inferior_environ, "LD_LIBRARY_PATH"), | |
c906108c SS |
328 | 1, filename, O_RDONLY, 0, &scratch_pathname); |
329 | } | |
330 | if (scratch_chan < 0) | |
331 | { | |
332 | perror_with_name (filename); | |
333 | } | |
334 | /* Leave scratch_pathname allocated. abfd->name will point to it. */ | |
335 | ||
336 | abfd = bfd_fdopenr (scratch_pathname, gnutarget, scratch_chan); | |
337 | if (!abfd) | |
338 | { | |
339 | close (scratch_chan); | |
340 | error ("Could not open `%s' as an executable file: %s", | |
341 | scratch_pathname, bfd_errmsg (bfd_get_error ())); | |
342 | } | |
343 | /* Leave bfd open, core_xfer_memory and "info files" need it. */ | |
c5aa993b JM |
344 | so->abfd = abfd; |
345 | abfd->cacheable = true; | |
c906108c SS |
346 | |
347 | /* copy full path name into so_name, so that later symbol_file_add can find | |
348 | it */ | |
349 | if (strlen (scratch_pathname) >= MAX_PATH_SIZE) | |
350 | error ("Full path name length of shared library exceeds MAX_PATH_SIZE in so_list structure."); | |
351 | strcpy (so->so_name, scratch_pathname); | |
352 | ||
353 | if (!bfd_check_format (abfd, bfd_object)) | |
354 | { | |
355 | error ("\"%s\": not in executable format: %s.", | |
356 | scratch_pathname, bfd_errmsg (bfd_get_error ())); | |
357 | } | |
c5aa993b | 358 | if (build_section_table (abfd, &so->sections, &so->sections_end)) |
c906108c | 359 | { |
c5aa993b | 360 | error ("Can't find the file sections in `%s': %s", |
c906108c SS |
361 | bfd_get_filename (abfd), bfd_errmsg (bfd_get_error ())); |
362 | } | |
363 | ||
c5aa993b | 364 | for (p = so->sections; p < so->sections_end; p++) |
c906108c SS |
365 | { |
366 | /* Relocate the section binding addresses as recorded in the shared | |
c5aa993b JM |
367 | object's file by the base address to which the object was actually |
368 | mapped. */ | |
07cd4b97 JB |
369 | p->addr += LM_ADDR (so); |
370 | p->endaddr += LM_ADDR (so); | |
371 | so->lmend = max (p->endaddr, so->lmend); | |
c5aa993b | 372 | if (STREQ (p->the_bfd_section->name, ".text")) |
c906108c | 373 | { |
c5aa993b | 374 | so->textsection = p; |
c906108c SS |
375 | } |
376 | } | |
377 | ||
378 | /* Free the file names, close the file now. */ | |
379 | do_cleanups (old_chain); | |
380 | ||
381 | return (1); | |
382 | } | |
383 | ||
384 | #ifndef SVR4_SHARED_LIBS | |
385 | ||
386 | /* Allocate the runtime common object file. */ | |
387 | ||
388 | static void | |
389 | allocate_rt_common_objfile () | |
390 | { | |
391 | struct objfile *objfile; | |
392 | struct objfile *last_one; | |
393 | ||
394 | objfile = (struct objfile *) xmalloc (sizeof (struct objfile)); | |
395 | memset (objfile, 0, sizeof (struct objfile)); | |
c5aa993b JM |
396 | objfile->md = NULL; |
397 | obstack_specify_allocation (&objfile->psymbol_cache.cache, 0, 0, | |
c906108c | 398 | xmalloc, free); |
c5aa993b | 399 | obstack_specify_allocation (&objfile->psymbol_obstack, 0, 0, xmalloc, |
c906108c | 400 | free); |
c5aa993b | 401 | obstack_specify_allocation (&objfile->symbol_obstack, 0, 0, xmalloc, |
c906108c | 402 | free); |
c5aa993b | 403 | obstack_specify_allocation (&objfile->type_obstack, 0, 0, xmalloc, |
c906108c | 404 | free); |
c5aa993b | 405 | objfile->name = mstrsave (objfile->md, "rt_common"); |
c906108c SS |
406 | |
407 | /* Add this file onto the tail of the linked list of other such files. */ | |
408 | ||
c5aa993b | 409 | objfile->next = NULL; |
c906108c SS |
410 | if (object_files == NULL) |
411 | object_files = objfile; | |
412 | else | |
413 | { | |
414 | for (last_one = object_files; | |
c5aa993b JM |
415 | last_one->next; |
416 | last_one = last_one->next); | |
417 | last_one->next = objfile; | |
c906108c SS |
418 | } |
419 | ||
420 | rt_common_objfile = objfile; | |
421 | } | |
422 | ||
423 | /* Read all dynamically loaded common symbol definitions from the inferior | |
424 | and put them into the minimal symbol table for the runtime common | |
425 | objfile. */ | |
426 | ||
427 | static void | |
428 | solib_add_common_symbols (rtc_symp) | |
07cd4b97 | 429 | CORE_ADDR rtc_symp; |
c906108c SS |
430 | { |
431 | struct rtc_symb inferior_rtc_symb; | |
432 | struct nlist inferior_rtc_nlist; | |
433 | int len; | |
434 | char *name; | |
435 | ||
436 | /* Remove any runtime common symbols from previous runs. */ | |
437 | ||
c5aa993b | 438 | if (rt_common_objfile != NULL && rt_common_objfile->minimal_symbol_count) |
c906108c | 439 | { |
c5aa993b JM |
440 | obstack_free (&rt_common_objfile->symbol_obstack, 0); |
441 | obstack_specify_allocation (&rt_common_objfile->symbol_obstack, 0, 0, | |
c906108c | 442 | xmalloc, free); |
c5aa993b JM |
443 | rt_common_objfile->minimal_symbol_count = 0; |
444 | rt_common_objfile->msymbols = NULL; | |
c906108c SS |
445 | } |
446 | ||
447 | init_minimal_symbol_collection (); | |
448 | make_cleanup ((make_cleanup_func) discard_minimal_symbols, 0); | |
449 | ||
450 | while (rtc_symp) | |
451 | { | |
07cd4b97 | 452 | read_memory (rtc_symp, |
c906108c SS |
453 | (char *) &inferior_rtc_symb, |
454 | sizeof (inferior_rtc_symb)); | |
07cd4b97 | 455 | read_memory (SOLIB_EXTRACT_ADDRESS (inferior_rtc_symb.rtc_sp), |
c906108c | 456 | (char *) &inferior_rtc_nlist, |
c5aa993b | 457 | sizeof (inferior_rtc_nlist)); |
c906108c SS |
458 | if (inferior_rtc_nlist.n_type == N_COMM) |
459 | { | |
460 | /* FIXME: The length of the symbol name is not available, but in the | |
461 | current implementation the common symbol is allocated immediately | |
462 | behind the name of the symbol. */ | |
463 | len = inferior_rtc_nlist.n_value - inferior_rtc_nlist.n_un.n_strx; | |
464 | ||
465 | name = xmalloc (len); | |
07cd4b97 JB |
466 | read_memory (SOLIB_EXTRACT_ADDRESS (inferior_rtc_nlist.n_un.n_name), |
467 | name, len); | |
c906108c SS |
468 | |
469 | /* Allocate the runtime common objfile if necessary. */ | |
470 | if (rt_common_objfile == NULL) | |
471 | allocate_rt_common_objfile (); | |
472 | ||
473 | prim_record_minimal_symbol (name, inferior_rtc_nlist.n_value, | |
474 | mst_bss, rt_common_objfile); | |
475 | free (name); | |
476 | } | |
07cd4b97 | 477 | rtc_symp = SOLIB_EXTRACT_ADDRESS (inferior_rtc_symb.rtc_next); |
c906108c SS |
478 | } |
479 | ||
480 | /* Install any minimal symbols that have been collected as the current | |
481 | minimal symbols for the runtime common objfile. */ | |
482 | ||
483 | install_minimal_symbols (rt_common_objfile); | |
484 | } | |
485 | ||
c5aa993b | 486 | #endif /* SVR4_SHARED_LIBS */ |
c906108c SS |
487 | |
488 | ||
489 | #ifdef SVR4_SHARED_LIBS | |
490 | ||
491 | static CORE_ADDR | |
c5aa993b | 492 | bfd_lookup_symbol PARAMS ((bfd *, char *)); |
c906108c SS |
493 | |
494 | /* | |
495 | ||
c5aa993b | 496 | LOCAL FUNCTION |
c906108c | 497 | |
c5aa993b | 498 | bfd_lookup_symbol -- lookup the value for a specific symbol |
c906108c | 499 | |
c5aa993b | 500 | SYNOPSIS |
c906108c | 501 | |
c5aa993b | 502 | CORE_ADDR bfd_lookup_symbol (bfd *abfd, char *symname) |
c906108c | 503 | |
c5aa993b | 504 | DESCRIPTION |
c906108c | 505 | |
c5aa993b JM |
506 | An expensive way to lookup the value of a single symbol for |
507 | bfd's that are only temporary anyway. This is used by the | |
508 | shared library support to find the address of the debugger | |
509 | interface structures in the shared library. | |
c906108c | 510 | |
c5aa993b JM |
511 | Note that 0 is specifically allowed as an error return (no |
512 | such symbol). | |
513 | */ | |
c906108c SS |
514 | |
515 | static CORE_ADDR | |
516 | bfd_lookup_symbol (abfd, symname) | |
517 | bfd *abfd; | |
518 | char *symname; | |
519 | { | |
520 | unsigned int storage_needed; | |
521 | asymbol *sym; | |
522 | asymbol **symbol_table; | |
523 | unsigned int number_of_symbols; | |
524 | unsigned int i; | |
525 | struct cleanup *back_to; | |
526 | CORE_ADDR symaddr = 0; | |
c5aa993b | 527 | |
c906108c SS |
528 | storage_needed = bfd_get_symtab_upper_bound (abfd); |
529 | ||
530 | if (storage_needed > 0) | |
531 | { | |
532 | symbol_table = (asymbol **) xmalloc (storage_needed); | |
c5aa993b JM |
533 | back_to = make_cleanup (free, (PTR) symbol_table); |
534 | number_of_symbols = bfd_canonicalize_symtab (abfd, symbol_table); | |
535 | ||
c906108c SS |
536 | for (i = 0; i < number_of_symbols; i++) |
537 | { | |
538 | sym = *symbol_table++; | |
c5aa993b | 539 | if (STREQ (sym->name, symname)) |
c906108c SS |
540 | { |
541 | /* Bfd symbols are section relative. */ | |
c5aa993b | 542 | symaddr = sym->value + sym->section->vma; |
c906108c SS |
543 | break; |
544 | } | |
545 | } | |
546 | do_cleanups (back_to); | |
547 | } | |
548 | return (symaddr); | |
549 | } | |
550 | ||
551 | #ifdef HANDLE_SVR4_EXEC_EMULATORS | |
552 | ||
553 | /* | |
c5aa993b JM |
554 | Solaris BCP (the part of Solaris which allows it to run SunOS4 |
555 | a.out files) throws in another wrinkle. Solaris does not fill | |
556 | in the usual a.out link map structures when running BCP programs, | |
557 | the only way to get at them is via groping around in the dynamic | |
558 | linker. | |
559 | The dynamic linker and it's structures are located in the shared | |
560 | C library, which gets run as the executable's "interpreter" by | |
561 | the kernel. | |
562 | ||
563 | Note that we can assume nothing about the process state at the time | |
564 | we need to find these structures. We may be stopped on the first | |
565 | instruction of the interpreter (C shared library), the first | |
566 | instruction of the executable itself, or somewhere else entirely | |
567 | (if we attached to the process for example). | |
568 | */ | |
569 | ||
570 | static char *debug_base_symbols[] = | |
571 | { | |
572 | "r_debug", /* Solaris 2.3 */ | |
573 | "_r_debug", /* Solaris 2.1, 2.2 */ | |
c906108c SS |
574 | NULL |
575 | }; | |
576 | ||
577 | static int | |
578 | look_for_base PARAMS ((int, CORE_ADDR)); | |
579 | ||
580 | /* | |
581 | ||
c5aa993b | 582 | LOCAL FUNCTION |
c906108c | 583 | |
c5aa993b | 584 | look_for_base -- examine file for each mapped address segment |
c906108c | 585 | |
c5aa993b | 586 | SYNOPSYS |
c906108c | 587 | |
c5aa993b | 588 | static int look_for_base (int fd, CORE_ADDR baseaddr) |
c906108c | 589 | |
c5aa993b | 590 | DESCRIPTION |
c906108c | 591 | |
c5aa993b JM |
592 | This function is passed to proc_iterate_over_mappings, which |
593 | causes it to get called once for each mapped address space, with | |
594 | an open file descriptor for the file mapped to that space, and the | |
595 | base address of that mapped space. | |
c906108c | 596 | |
c5aa993b JM |
597 | Our job is to find the debug base symbol in the file that this |
598 | fd is open on, if it exists, and if so, initialize the dynamic | |
599 | linker structure base address debug_base. | |
c906108c | 600 | |
c5aa993b JM |
601 | Note that this is a computationally expensive proposition, since |
602 | we basically have to open a bfd on every call, so we specifically | |
603 | avoid opening the exec file. | |
c906108c SS |
604 | */ |
605 | ||
606 | static int | |
607 | look_for_base (fd, baseaddr) | |
608 | int fd; | |
609 | CORE_ADDR baseaddr; | |
610 | { | |
611 | bfd *interp_bfd; | |
612 | CORE_ADDR address = 0; | |
613 | char **symbolp; | |
614 | ||
615 | /* If the fd is -1, then there is no file that corresponds to this | |
616 | mapped memory segment, so skip it. Also, if the fd corresponds | |
617 | to the exec file, skip it as well. */ | |
618 | ||
619 | if (fd == -1 | |
620 | || (exec_bfd != NULL | |
c5aa993b | 621 | && fdmatch (fileno ((FILE *) (exec_bfd->iostream)), fd))) |
c906108c SS |
622 | { |
623 | return (0); | |
624 | } | |
625 | ||
626 | /* Try to open whatever random file this fd corresponds to. Note that | |
627 | we have no way currently to find the filename. Don't gripe about | |
628 | any problems we might have, just fail. */ | |
629 | ||
630 | if ((interp_bfd = bfd_fdopenr ("unnamed", gnutarget, fd)) == NULL) | |
631 | { | |
632 | return (0); | |
633 | } | |
634 | if (!bfd_check_format (interp_bfd, bfd_object)) | |
635 | { | |
636 | /* FIXME-leak: on failure, might not free all memory associated with | |
c5aa993b | 637 | interp_bfd. */ |
c906108c SS |
638 | bfd_close (interp_bfd); |
639 | return (0); | |
640 | } | |
641 | ||
642 | /* Now try to find our debug base symbol in this file, which we at | |
643 | least know to be a valid ELF executable or shared library. */ | |
644 | ||
645 | for (symbolp = debug_base_symbols; *symbolp != NULL; symbolp++) | |
646 | { | |
647 | address = bfd_lookup_symbol (interp_bfd, *symbolp); | |
648 | if (address != 0) | |
649 | { | |
650 | break; | |
651 | } | |
652 | } | |
653 | if (address == 0) | |
654 | { | |
655 | /* FIXME-leak: on failure, might not free all memory associated with | |
c5aa993b | 656 | interp_bfd. */ |
c906108c SS |
657 | bfd_close (interp_bfd); |
658 | return (0); | |
659 | } | |
660 | ||
661 | /* Eureka! We found the symbol. But now we may need to relocate it | |
662 | by the base address. If the symbol's value is less than the base | |
663 | address of the shared library, then it hasn't yet been relocated | |
664 | by the dynamic linker, and we have to do it ourself. FIXME: Note | |
665 | that we make the assumption that the first segment that corresponds | |
666 | to the shared library has the base address to which the library | |
667 | was relocated. */ | |
668 | ||
669 | if (address < baseaddr) | |
670 | { | |
671 | address += baseaddr; | |
672 | } | |
673 | debug_base = address; | |
674 | /* FIXME-leak: on failure, might not free all memory associated with | |
675 | interp_bfd. */ | |
676 | bfd_close (interp_bfd); | |
677 | return (1); | |
678 | } | |
679 | #endif /* HANDLE_SVR4_EXEC_EMULATORS */ | |
680 | ||
681 | /* | |
682 | ||
c5aa993b | 683 | LOCAL FUNCTION |
c906108c | 684 | |
c5aa993b JM |
685 | elf_locate_base -- locate the base address of dynamic linker structs |
686 | for SVR4 elf targets. | |
c906108c | 687 | |
c5aa993b | 688 | SYNOPSIS |
c906108c | 689 | |
c5aa993b | 690 | CORE_ADDR elf_locate_base (void) |
c906108c | 691 | |
c5aa993b | 692 | DESCRIPTION |
c906108c | 693 | |
c5aa993b JM |
694 | For SVR4 elf targets the address of the dynamic linker's runtime |
695 | structure is contained within the dynamic info section in the | |
696 | executable file. The dynamic section is also mapped into the | |
697 | inferior address space. Because the runtime loader fills in the | |
698 | real address before starting the inferior, we have to read in the | |
699 | dynamic info section from the inferior address space. | |
700 | If there are any errors while trying to find the address, we | |
701 | silently return 0, otherwise the found address is returned. | |
c906108c SS |
702 | |
703 | */ | |
704 | ||
705 | static CORE_ADDR | |
706 | elf_locate_base () | |
707 | { | |
708 | sec_ptr dyninfo_sect; | |
709 | int dyninfo_sect_size; | |
710 | CORE_ADDR dyninfo_addr; | |
711 | char *buf; | |
712 | char *bufend; | |
713 | ||
714 | /* Find the start address of the .dynamic section. */ | |
715 | dyninfo_sect = bfd_get_section_by_name (exec_bfd, ".dynamic"); | |
716 | if (dyninfo_sect == NULL) | |
717 | return 0; | |
718 | dyninfo_addr = bfd_section_vma (exec_bfd, dyninfo_sect); | |
719 | ||
720 | /* Read in .dynamic section, silently ignore errors. */ | |
721 | dyninfo_sect_size = bfd_section_size (exec_bfd, dyninfo_sect); | |
722 | buf = alloca (dyninfo_sect_size); | |
723 | if (target_read_memory (dyninfo_addr, buf, dyninfo_sect_size)) | |
724 | return 0; | |
725 | ||
726 | /* Find the DT_DEBUG entry in the the .dynamic section. | |
727 | For mips elf we look for DT_MIPS_RLD_MAP, mips elf apparently has | |
728 | no DT_DEBUG entries. */ | |
729 | #ifndef TARGET_ELF64 | |
730 | for (bufend = buf + dyninfo_sect_size; | |
731 | buf < bufend; | |
732 | buf += sizeof (Elf32_External_Dyn)) | |
733 | { | |
c5aa993b | 734 | Elf32_External_Dyn *x_dynp = (Elf32_External_Dyn *) buf; |
c906108c SS |
735 | long dyn_tag; |
736 | CORE_ADDR dyn_ptr; | |
737 | ||
738 | dyn_tag = bfd_h_get_32 (exec_bfd, (bfd_byte *) x_dynp->d_tag); | |
739 | if (dyn_tag == DT_NULL) | |
740 | break; | |
741 | else if (dyn_tag == DT_DEBUG) | |
742 | { | |
743 | dyn_ptr = bfd_h_get_32 (exec_bfd, (bfd_byte *) x_dynp->d_un.d_ptr); | |
744 | return dyn_ptr; | |
745 | } | |
746 | #ifdef DT_MIPS_RLD_MAP | |
747 | else if (dyn_tag == DT_MIPS_RLD_MAP) | |
748 | { | |
749 | char pbuf[TARGET_PTR_BIT / HOST_CHAR_BIT]; | |
750 | ||
751 | /* DT_MIPS_RLD_MAP contains a pointer to the address | |
752 | of the dynamic link structure. */ | |
753 | dyn_ptr = bfd_h_get_32 (exec_bfd, (bfd_byte *) x_dynp->d_un.d_ptr); | |
754 | if (target_read_memory (dyn_ptr, pbuf, sizeof (pbuf))) | |
755 | return 0; | |
756 | return extract_unsigned_integer (pbuf, sizeof (pbuf)); | |
757 | } | |
758 | #endif | |
759 | } | |
760 | #else /* ELF64 */ | |
761 | for (bufend = buf + dyninfo_sect_size; | |
762 | buf < bufend; | |
763 | buf += sizeof (Elf64_External_Dyn)) | |
764 | { | |
c5aa993b | 765 | Elf64_External_Dyn *x_dynp = (Elf64_External_Dyn *) buf; |
c906108c SS |
766 | long dyn_tag; |
767 | CORE_ADDR dyn_ptr; | |
768 | ||
769 | dyn_tag = bfd_h_get_64 (exec_bfd, (bfd_byte *) x_dynp->d_tag); | |
770 | if (dyn_tag == DT_NULL) | |
771 | break; | |
772 | else if (dyn_tag == DT_DEBUG) | |
773 | { | |
774 | dyn_ptr = bfd_h_get_64 (exec_bfd, (bfd_byte *) x_dynp->d_un.d_ptr); | |
775 | return dyn_ptr; | |
776 | } | |
777 | } | |
778 | #endif | |
779 | ||
780 | /* DT_DEBUG entry not found. */ | |
781 | return 0; | |
782 | } | |
783 | ||
c5aa993b | 784 | #endif /* SVR4_SHARED_LIBS */ |
c906108c SS |
785 | |
786 | /* | |
787 | ||
c5aa993b | 788 | LOCAL FUNCTION |
c906108c | 789 | |
c5aa993b | 790 | locate_base -- locate the base address of dynamic linker structs |
c906108c | 791 | |
c5aa993b | 792 | SYNOPSIS |
c906108c | 793 | |
c5aa993b | 794 | CORE_ADDR locate_base (void) |
c906108c | 795 | |
c5aa993b | 796 | DESCRIPTION |
c906108c | 797 | |
c5aa993b JM |
798 | For both the SunOS and SVR4 shared library implementations, if the |
799 | inferior executable has been linked dynamically, there is a single | |
800 | address somewhere in the inferior's data space which is the key to | |
801 | locating all of the dynamic linker's runtime structures. This | |
802 | address is the value of the debug base symbol. The job of this | |
803 | function is to find and return that address, or to return 0 if there | |
804 | is no such address (the executable is statically linked for example). | |
c906108c | 805 | |
c5aa993b JM |
806 | For SunOS, the job is almost trivial, since the dynamic linker and |
807 | all of it's structures are statically linked to the executable at | |
808 | link time. Thus the symbol for the address we are looking for has | |
809 | already been added to the minimal symbol table for the executable's | |
810 | objfile at the time the symbol file's symbols were read, and all we | |
811 | have to do is look it up there. Note that we explicitly do NOT want | |
812 | to find the copies in the shared library. | |
c906108c | 813 | |
c5aa993b JM |
814 | The SVR4 version is a bit more complicated because the address |
815 | is contained somewhere in the dynamic info section. We have to go | |
816 | to a lot more work to discover the address of the debug base symbol. | |
817 | Because of this complexity, we cache the value we find and return that | |
818 | value on subsequent invocations. Note there is no copy in the | |
819 | executable symbol tables. | |
c906108c SS |
820 | |
821 | */ | |
822 | ||
823 | static CORE_ADDR | |
824 | locate_base () | |
825 | { | |
826 | ||
827 | #ifndef SVR4_SHARED_LIBS | |
828 | ||
829 | struct minimal_symbol *msymbol; | |
830 | CORE_ADDR address = 0; | |
831 | char **symbolp; | |
832 | ||
833 | /* For SunOS, we want to limit the search for the debug base symbol to the | |
834 | executable being debugged, since there is a duplicate named symbol in the | |
835 | shared library. We don't want the shared library versions. */ | |
836 | ||
837 | for (symbolp = debug_base_symbols; *symbolp != NULL; symbolp++) | |
838 | { | |
839 | msymbol = lookup_minimal_symbol (*symbolp, NULL, symfile_objfile); | |
840 | if ((msymbol != NULL) && (SYMBOL_VALUE_ADDRESS (msymbol) != 0)) | |
841 | { | |
842 | address = SYMBOL_VALUE_ADDRESS (msymbol); | |
843 | return (address); | |
844 | } | |
845 | } | |
846 | return (0); | |
847 | ||
c5aa993b | 848 | #else /* SVR4_SHARED_LIBS */ |
c906108c SS |
849 | |
850 | /* Check to see if we have a currently valid address, and if so, avoid | |
851 | doing all this work again and just return the cached address. If | |
852 | we have no cached address, try to locate it in the dynamic info | |
853 | section for ELF executables. */ | |
854 | ||
855 | if (debug_base == 0) | |
856 | { | |
857 | if (exec_bfd != NULL | |
858 | && bfd_get_flavour (exec_bfd) == bfd_target_elf_flavour) | |
859 | debug_base = elf_locate_base (); | |
860 | #ifdef HANDLE_SVR4_EXEC_EMULATORS | |
861 | /* Try it the hard way for emulated executables. */ | |
862 | else if (inferior_pid != 0 && target_has_execution) | |
863 | proc_iterate_over_mappings (look_for_base); | |
864 | #endif | |
865 | } | |
866 | return (debug_base); | |
867 | ||
c5aa993b | 868 | #endif /* !SVR4_SHARED_LIBS */ |
c906108c SS |
869 | |
870 | } | |
871 | ||
872 | /* | |
873 | ||
c5aa993b | 874 | LOCAL FUNCTION |
c906108c | 875 | |
c5aa993b | 876 | first_link_map_member -- locate first member in dynamic linker's map |
c906108c | 877 | |
c5aa993b | 878 | SYNOPSIS |
c906108c | 879 | |
07cd4b97 | 880 | static CORE_ADDR first_link_map_member (void) |
c906108c | 881 | |
c5aa993b | 882 | DESCRIPTION |
c906108c | 883 | |
9ddea9f1 JB |
884 | Find the first element in the inferior's dynamic link map, and |
885 | return its address in the inferior. This function doesn't copy the | |
07cd4b97 | 886 | link map entry itself into our address space; current_sos actually |
9ddea9f1 | 887 | does the reading. */ |
c906108c | 888 | |
07cd4b97 | 889 | static CORE_ADDR |
c906108c SS |
890 | first_link_map_member () |
891 | { | |
07cd4b97 | 892 | CORE_ADDR lm = 0; |
c906108c SS |
893 | |
894 | #ifndef SVR4_SHARED_LIBS | |
895 | ||
896 | read_memory (debug_base, (char *) &dynamic_copy, sizeof (dynamic_copy)); | |
897 | if (dynamic_copy.ld_version >= 2) | |
898 | { | |
899 | /* It is a version that we can deal with, so read in the secondary | |
c5aa993b | 900 | structure and find the address of the link map list from it. */ |
07cd4b97 JB |
901 | read_memory (SOLIB_EXTRACT_ADDRESS (dynamic_copy.ld_un.ld_2), |
902 | (char *) &ld_2_copy, sizeof (struct link_dynamic_2)); | |
903 | lm = SOLIB_EXTRACT_ADDRESS (ld_2_copy.ld_loaded); | |
c906108c SS |
904 | } |
905 | ||
c5aa993b | 906 | #else /* SVR4_SHARED_LIBS */ |
c906108c SS |
907 | |
908 | read_memory (debug_base, (char *) &debug_copy, sizeof (struct r_debug)); | |
909 | /* FIXME: Perhaps we should validate the info somehow, perhaps by | |
910 | checking r_version for a known version number, or r_state for | |
911 | RT_CONSISTENT. */ | |
07cd4b97 | 912 | lm = SOLIB_EXTRACT_ADDRESS (debug_copy.r_map); |
c906108c | 913 | |
c5aa993b | 914 | #endif /* !SVR4_SHARED_LIBS */ |
c906108c SS |
915 | |
916 | return (lm); | |
917 | } | |
918 | ||
104c1213 JM |
919 | #ifdef SVR4_SHARED_LIBS |
920 | /* | |
921 | ||
922 | LOCAL FUNCTION | |
923 | ||
9452d09b | 924 | open_symbol_file_object |
104c1213 JM |
925 | |
926 | SYNOPSIS | |
927 | ||
928 | void open_symbol_file_object (int from_tty) | |
929 | ||
930 | DESCRIPTION | |
931 | ||
932 | If no open symbol file, attempt to locate and open the main symbol | |
933 | file. On SVR4 systems, this is the first link map entry. If its | |
934 | name is here, we can open it. Useful when attaching to a process | |
935 | without first loading its symbol file. | |
936 | ||
937 | */ | |
938 | ||
9452d09b MS |
939 | static int |
940 | open_symbol_file_object (from_ttyp) | |
941 | int *from_ttyp; /* sneak past catch_errors */ | |
104c1213 | 942 | { |
07cd4b97 JB |
943 | CORE_ADDR lm; |
944 | struct link_map lmcopy; | |
104c1213 JM |
945 | char *filename; |
946 | int errcode; | |
947 | ||
948 | if (symfile_objfile) | |
949 | if (!query ("Attempt to reload symbols from process? ")) | |
950 | return 0; | |
951 | ||
952 | if ((debug_base = locate_base ()) == 0) | |
953 | return 0; /* failed somehow... */ | |
954 | ||
955 | /* First link map member should be the executable. */ | |
07cd4b97 | 956 | if ((lm = first_link_map_member ()) == 0) |
104c1213 JM |
957 | return 0; /* failed somehow... */ |
958 | ||
959 | /* Read from target memory to GDB. */ | |
07cd4b97 | 960 | read_memory (lm, (void *) &lmcopy, sizeof (lmcopy)); |
104c1213 JM |
961 | |
962 | if (lmcopy.l_name == 0) | |
963 | return 0; /* no filename. */ | |
964 | ||
965 | /* Now fetch the filename from target memory. */ | |
07cd4b97 | 966 | target_read_string (SOLIB_EXTRACT_ADDRESS (lmcopy.l_name), &filename, |
104c1213 JM |
967 | MAX_PATH_SIZE - 1, &errcode); |
968 | if (errcode) | |
969 | { | |
970 | warning ("failed to read exec filename from attached file: %s", | |
971 | safe_strerror (errcode)); | |
972 | return 0; | |
973 | } | |
974 | ||
975 | make_cleanup ((make_cleanup_func) free, (void *) filename); | |
976 | /* Have a pathname: read the symbol file. */ | |
9452d09b | 977 | symbol_file_command (filename, *from_ttyp); |
104c1213 JM |
978 | |
979 | return 1; | |
980 | } | |
981 | #endif /* SVR4_SHARED_LIBS */ | |
982 | ||
c906108c | 983 | |
07cd4b97 | 984 | /* LOCAL FUNCTION |
c906108c | 985 | |
07cd4b97 | 986 | free_so --- free a `struct so_list' object |
c906108c | 987 | |
c5aa993b | 988 | SYNOPSIS |
c906108c | 989 | |
07cd4b97 | 990 | void free_so (struct so_list *so) |
c906108c | 991 | |
c5aa993b | 992 | DESCRIPTION |
c906108c | 993 | |
07cd4b97 JB |
994 | Free the storage associated with the `struct so_list' object SO. |
995 | If we have opened a BFD for SO, close it. | |
c906108c | 996 | |
07cd4b97 JB |
997 | The caller is responsible for removing SO from whatever list it is |
998 | a member of. If we have placed SO's sections in some target's | |
999 | section table, the caller is responsible for removing them. | |
c906108c | 1000 | |
07cd4b97 JB |
1001 | This function doesn't mess with objfiles at all. If there is an |
1002 | objfile associated with SO that needs to be removed, the caller is | |
1003 | responsible for taking care of that. */ | |
1004 | ||
1005 | static void | |
1006 | free_so (struct so_list *so) | |
c906108c | 1007 | { |
07cd4b97 | 1008 | char *bfd_filename = 0; |
c5aa993b | 1009 | |
07cd4b97 JB |
1010 | if (so->sections) |
1011 | free (so->sections); | |
1012 | ||
1013 | if (so->abfd) | |
c906108c | 1014 | { |
07cd4b97 JB |
1015 | bfd_filename = bfd_get_filename (so->abfd); |
1016 | if (! bfd_close (so->abfd)) | |
1017 | warning ("cannot close \"%s\": %s", | |
1018 | bfd_filename, bfd_errmsg (bfd_get_error ())); | |
c906108c | 1019 | } |
07cd4b97 JB |
1020 | |
1021 | if (bfd_filename) | |
1022 | free (bfd_filename); | |
1023 | ||
1024 | free (so); | |
1025 | } | |
1026 | ||
1027 | ||
1028 | /* On some systems, the only way to recognize the link map entry for | |
1029 | the main executable file is by looking at its name. Return | |
1030 | non-zero iff SONAME matches one of the known main executable names. */ | |
1031 | ||
1032 | static int | |
1033 | match_main (soname) | |
1034 | char *soname; | |
1035 | { | |
1036 | char **mainp; | |
1037 | ||
1038 | for (mainp = main_name_list; *mainp != NULL; mainp++) | |
c906108c | 1039 | { |
07cd4b97 JB |
1040 | if (strcmp (soname, *mainp) == 0) |
1041 | return (1); | |
c906108c | 1042 | } |
07cd4b97 JB |
1043 | |
1044 | return (0); | |
1045 | } | |
1046 | ||
1047 | ||
1048 | /* LOCAL FUNCTION | |
1049 | ||
1050 | current_sos -- build a list of currently loaded shared objects | |
1051 | ||
1052 | SYNOPSIS | |
1053 | ||
1054 | struct so_list *current_sos () | |
1055 | ||
1056 | DESCRIPTION | |
1057 | ||
1058 | Build a list of `struct so_list' objects describing the shared | |
1059 | objects currently loaded in the inferior. This list does not | |
1060 | include an entry for the main executable file. | |
1061 | ||
1062 | Note that we only gather information directly available from the | |
1063 | inferior --- we don't examine any of the shared library files | |
1064 | themselves. The declaration of `struct so_list' says which fields | |
1065 | we provide values for. */ | |
1066 | ||
1067 | static struct so_list * | |
1068 | current_sos () | |
1069 | { | |
1070 | CORE_ADDR lm; | |
1071 | struct so_list *head = 0; | |
1072 | struct so_list **link_ptr = &head; | |
1073 | ||
1074 | /* Make sure we've looked up the inferior's dynamic linker's base | |
1075 | structure. */ | |
1076 | if (! debug_base) | |
c906108c | 1077 | { |
07cd4b97 JB |
1078 | debug_base = locate_base (); |
1079 | ||
1080 | /* If we can't find the dynamic linker's base structure, this | |
1081 | must not be a dynamically linked executable. Hmm. */ | |
1082 | if (! debug_base) | |
1083 | return 0; | |
1084 | } | |
1085 | ||
1086 | /* Walk the inferior's link map list, and build our list of | |
1087 | `struct so_list' nodes. */ | |
1088 | lm = first_link_map_member (); | |
1089 | while (lm) | |
1090 | { | |
1091 | struct so_list *new | |
1092 | = (struct so_list *) xmalloc (sizeof (struct so_list)); | |
15588ebb | 1093 | struct cleanup *old_chain = make_cleanup (free, new); |
07cd4b97 JB |
1094 | memset (new, 0, sizeof (*new)); |
1095 | ||
c5aa993b | 1096 | new->lmaddr = lm; |
07cd4b97 | 1097 | read_memory (lm, (char *) &(new->lm), sizeof (struct link_map)); |
c906108c | 1098 | |
07cd4b97 | 1099 | lm = LM_NEXT (new); |
c5aa993b | 1100 | |
c906108c | 1101 | /* For SVR4 versions, the first entry in the link map is for the |
c5aa993b JM |
1102 | inferior executable, so we must ignore it. For some versions of |
1103 | SVR4, it has no name. For others (Solaris 2.3 for example), it | |
1104 | does have a name, so we can no longer use a missing name to | |
1105 | decide when to ignore it. */ | |
07cd4b97 | 1106 | if (IGNORE_FIRST_LINK_MAP_ENTRY (new)) |
15588ebb | 1107 | free_so (new); |
07cd4b97 | 1108 | else |
c906108c SS |
1109 | { |
1110 | int errcode; | |
1111 | char *buffer; | |
07cd4b97 JB |
1112 | |
1113 | /* Extract this shared object's name. */ | |
1114 | target_read_string (LM_NAME (new), &buffer, | |
c906108c SS |
1115 | MAX_PATH_SIZE - 1, &errcode); |
1116 | if (errcode != 0) | |
1117 | { | |
07cd4b97 | 1118 | warning ("current_sos: Can't read pathname for load map: %s\n", |
c906108c | 1119 | safe_strerror (errcode)); |
c906108c | 1120 | } |
07cd4b97 JB |
1121 | else |
1122 | { | |
1123 | strncpy (new->so_name, buffer, MAX_PATH_SIZE - 1); | |
1124 | new->so_name[MAX_PATH_SIZE - 1] = '\0'; | |
1125 | free (buffer); | |
1126 | strcpy (new->so_original_name, new->so_name); | |
1127 | } | |
1128 | ||
1129 | /* If this entry has no name, or its name matches the name | |
1130 | for the main executable, don't include it in the list. */ | |
1131 | if (! new->so_name[0] | |
1132 | || match_main (new->so_name)) | |
1133 | free_so (new); | |
1134 | else | |
1135 | { | |
1136 | new->next = 0; | |
1137 | *link_ptr = new; | |
1138 | link_ptr = &new->next; | |
1139 | } | |
c5aa993b | 1140 | } |
15588ebb JB |
1141 | |
1142 | discard_cleanups (old_chain); | |
c906108c | 1143 | } |
07cd4b97 JB |
1144 | |
1145 | return head; | |
c906108c SS |
1146 | } |
1147 | ||
07cd4b97 | 1148 | |
c906108c SS |
1149 | /* A small stub to get us past the arg-passing pinhole of catch_errors. */ |
1150 | ||
1151 | static int | |
1152 | symbol_add_stub (arg) | |
1153 | PTR arg; | |
1154 | { | |
07cd4b97 | 1155 | register struct so_list *so = (struct so_list *) arg; /* catch_errs bogon */ |
c906108c | 1156 | CORE_ADDR text_addr = 0; |
62557bbc | 1157 | struct section_addr_info *sap; |
e7cf9df1 EZ |
1158 | int i; |
1159 | asection *text_section; | |
c906108c | 1160 | |
07cd4b97 JB |
1161 | /* Have we already loaded this shared object? */ |
1162 | ALL_OBJFILES (so->objfile) | |
1163 | { | |
1164 | if (strcmp (so->objfile->name, so->so_name) == 0) | |
1165 | return 1; | |
1166 | } | |
1167 | ||
1168 | /* Find the shared object's text segment. */ | |
c5aa993b JM |
1169 | if (so->textsection) |
1170 | text_addr = so->textsection->addr; | |
1171 | else if (so->abfd != NULL) | |
c906108c SS |
1172 | { |
1173 | asection *lowest_sect; | |
1174 | ||
1175 | /* If we didn't find a mapped non zero sized .text section, set up | |
c5aa993b | 1176 | text_addr so that the relocation in symbol_file_add does no harm. */ |
c5aa993b | 1177 | lowest_sect = bfd_get_section_by_name (so->abfd, ".text"); |
c906108c | 1178 | if (lowest_sect == NULL) |
c5aa993b | 1179 | bfd_map_over_sections (so->abfd, find_lowest_section, |
96baa820 | 1180 | (PTR) &lowest_sect); |
c906108c | 1181 | if (lowest_sect) |
c5aa993b | 1182 | text_addr = bfd_section_vma (so->abfd, lowest_sect) |
07cd4b97 | 1183 | + LM_ADDR (so); |
c906108c | 1184 | } |
c5aa993b | 1185 | |
62557bbc KB |
1186 | sap = build_section_addr_info_from_section_table (so->sections, |
1187 | so->sections_end); | |
e7cf9df1 EZ |
1188 | |
1189 | /* Look for the index for the .text section in the sap structure. */ | |
1190 | text_section = bfd_get_section_by_name (so->abfd, ".text"); | |
1191 | for (i = 0; i < MAX_SECTIONS && sap->other[i].name; i++) | |
1192 | if (sap->other[i].sectindex == text_section->index) | |
1193 | break; | |
1194 | ||
1195 | sap->other[i].addr = text_addr; | |
62557bbc KB |
1196 | so->objfile = symbol_file_add (so->so_name, so->from_tty, |
1197 | sap, 0, OBJF_SHARED); | |
1198 | free_section_addr_info (sap); | |
c906108c | 1199 | |
07cd4b97 | 1200 | return (1); |
c906108c SS |
1201 | } |
1202 | ||
c906108c | 1203 | |
07cd4b97 | 1204 | /* LOCAL FUNCTION |
c906108c | 1205 | |
105b175f | 1206 | update_solib_list --- synchronize GDB's shared object list with inferior's |
c906108c | 1207 | |
c5aa993b | 1208 | SYNOPSIS |
c906108c | 1209 | |
105b175f | 1210 | void update_solib_list (int from_tty, struct target_ops *TARGET) |
c906108c | 1211 | |
07cd4b97 | 1212 | Extract the list of currently loaded shared objects from the |
105b175f JB |
1213 | inferior, and compare it with the list of shared objects currently |
1214 | in GDB's so_list_head list. Edit so_list_head to bring it in sync | |
1215 | with the inferior's new list. | |
c906108c | 1216 | |
105b175f JB |
1217 | If we notice that the inferior has unloaded some shared objects, |
1218 | free any symbolic info GDB had read about those shared objects. | |
1219 | ||
1220 | Don't load symbolic info for any new shared objects; just add them | |
1221 | to the list, and leave their symbols_loaded flag clear. | |
07cd4b97 JB |
1222 | |
1223 | If FROM_TTY is non-null, feel free to print messages about what | |
1224 | we're doing. | |
c906108c | 1225 | |
07cd4b97 JB |
1226 | If TARGET is non-null, add the sections of all new shared objects |
1227 | to TARGET's section table. Note that this doesn't remove any | |
1228 | sections for shared objects that have been unloaded, and it | |
1229 | doesn't check to see if the new shared objects are already present in | |
1230 | the section table. But we only use this for core files and | |
1231 | processes we've just attached to, so that's okay. */ | |
c906108c | 1232 | |
07cd4b97 | 1233 | void |
105b175f | 1234 | update_solib_list (int from_tty, struct target_ops *target) |
07cd4b97 JB |
1235 | { |
1236 | struct so_list *inferior = current_sos (); | |
1237 | struct so_list *gdb, **gdb_link; | |
1238 | ||
104c1213 JM |
1239 | #ifdef SVR4_SHARED_LIBS |
1240 | /* If we are attaching to a running process for which we | |
1241 | have not opened a symbol file, we may be able to get its | |
1242 | symbols now! */ | |
1243 | if (attach_flag && | |
1244 | symfile_objfile == NULL) | |
9452d09b | 1245 | catch_errors (open_symbol_file_object, (PTR) &from_tty, |
104c1213 JM |
1246 | "Error reading attached process's symbol file.\n", |
1247 | RETURN_MASK_ALL); | |
1248 | ||
1249 | #endif SVR4_SHARED_LIBS | |
1250 | ||
07cd4b97 JB |
1251 | /* Since this function might actually add some elements to the |
1252 | so_list_head list, arrange for it to be cleaned up when | |
1253 | appropriate. */ | |
1254 | if (!solib_cleanup_queued) | |
1255 | { | |
1256 | make_run_cleanup (do_clear_solib, NULL); | |
1257 | solib_cleanup_queued = 1; | |
c906108c | 1258 | } |
c5aa993b | 1259 | |
07cd4b97 JB |
1260 | /* GDB and the inferior's dynamic linker each maintain their own |
1261 | list of currently loaded shared objects; we want to bring the | |
1262 | former in sync with the latter. Scan both lists, seeing which | |
1263 | shared objects appear where. There are three cases: | |
1264 | ||
1265 | - A shared object appears on both lists. This means that GDB | |
105b175f JB |
1266 | knows about it already, and it's still loaded in the inferior. |
1267 | Nothing needs to happen. | |
07cd4b97 JB |
1268 | |
1269 | - A shared object appears only on GDB's list. This means that | |
105b175f JB |
1270 | the inferior has unloaded it. We should remove the shared |
1271 | object from GDB's tables. | |
07cd4b97 JB |
1272 | |
1273 | - A shared object appears only on the inferior's list. This | |
105b175f JB |
1274 | means that it's just been loaded. We should add it to GDB's |
1275 | tables. | |
07cd4b97 JB |
1276 | |
1277 | So we walk GDB's list, checking each entry to see if it appears | |
1278 | in the inferior's list too. If it does, no action is needed, and | |
1279 | we remove it from the inferior's list. If it doesn't, the | |
1280 | inferior has unloaded it, and we remove it from GDB's list. By | |
1281 | the time we're done walking GDB's list, the inferior's list | |
1282 | contains only the new shared objects, which we then add. */ | |
1283 | ||
1284 | gdb = so_list_head; | |
1285 | gdb_link = &so_list_head; | |
1286 | while (gdb) | |
c906108c | 1287 | { |
07cd4b97 JB |
1288 | struct so_list *i = inferior; |
1289 | struct so_list **i_link = &inferior; | |
1290 | ||
1291 | /* Check to see whether the shared object *gdb also appears in | |
1292 | the inferior's current list. */ | |
1293 | while (i) | |
c906108c | 1294 | { |
07cd4b97 JB |
1295 | if (! strcmp (gdb->so_original_name, i->so_original_name)) |
1296 | break; | |
1297 | ||
1298 | i_link = &i->next; | |
1299 | i = *i_link; | |
c906108c | 1300 | } |
c5aa993b | 1301 | |
07cd4b97 JB |
1302 | /* If the shared object appears on the inferior's list too, then |
1303 | it's still loaded, so we don't need to do anything. Delete | |
1304 | it from the inferior's list, and leave it on GDB's list. */ | |
1305 | if (i) | |
c906108c | 1306 | { |
07cd4b97 | 1307 | *i_link = i->next; |
07cd4b97 JB |
1308 | free_so (i); |
1309 | gdb_link = &gdb->next; | |
1310 | gdb = *gdb_link; | |
1311 | } | |
1312 | ||
1313 | /* If it's not on the inferior's list, remove it from GDB's tables. */ | |
1314 | else | |
1315 | { | |
1316 | *gdb_link = gdb->next; | |
07cd4b97 JB |
1317 | |
1318 | /* Unless the user loaded it explicitly, free SO's objfile. */ | |
e8930304 | 1319 | if (gdb->objfile && ! (gdb->objfile->flags & OBJF_USERLOADED)) |
07cd4b97 JB |
1320 | free_objfile (gdb->objfile); |
1321 | ||
1322 | /* Some targets' section tables might be referring to | |
1323 | sections from so->abfd; remove them. */ | |
1324 | remove_target_sections (gdb->abfd); | |
1325 | ||
1326 | free_so (gdb); | |
1327 | gdb = *gdb_link; | |
c906108c SS |
1328 | } |
1329 | } | |
c5aa993b | 1330 | |
07cd4b97 JB |
1331 | /* Now the inferior's list contains only shared objects that don't |
1332 | appear in GDB's list --- those that are newly loaded. Add them | |
e8930304 | 1333 | to GDB's shared object list. */ |
07cd4b97 | 1334 | if (inferior) |
c906108c | 1335 | { |
07cd4b97 JB |
1336 | struct so_list *i; |
1337 | ||
1338 | /* Add the new shared objects to GDB's list. */ | |
1339 | *gdb_link = inferior; | |
1340 | ||
e8930304 | 1341 | /* Fill in the rest of each of the `struct so_list' nodes. */ |
07cd4b97 | 1342 | for (i = inferior; i; i = i->next) |
c906108c | 1343 | { |
07cd4b97 JB |
1344 | i->from_tty = from_tty; |
1345 | ||
1346 | /* Fill in the rest of the `struct so_list' node. */ | |
1347 | catch_errors (solib_map_sections, i, | |
1348 | "Error while mapping shared library sections:\n", | |
1349 | RETURN_MASK_ALL); | |
07cd4b97 JB |
1350 | } |
1351 | ||
1352 | /* If requested, add the shared objects' sections to the the | |
1353 | TARGET's section table. */ | |
1354 | if (target) | |
1355 | { | |
1356 | int new_sections; | |
1357 | ||
1358 | /* Figure out how many sections we'll need to add in total. */ | |
1359 | new_sections = 0; | |
1360 | for (i = inferior; i; i = i->next) | |
1361 | new_sections += (i->sections_end - i->sections); | |
1362 | ||
1363 | if (new_sections > 0) | |
c906108c | 1364 | { |
07cd4b97 JB |
1365 | int space = target_resize_to_sections (target, new_sections); |
1366 | ||
1367 | for (i = inferior; i; i = i->next) | |
1368 | { | |
1369 | int count = (i->sections_end - i->sections); | |
1370 | memcpy (target->to_sections + space, | |
1371 | i->sections, | |
1372 | count * sizeof (i->sections[0])); | |
1373 | space += count; | |
1374 | } | |
c906108c SS |
1375 | } |
1376 | } | |
e8930304 | 1377 | } |
105b175f JB |
1378 | } |
1379 | ||
1380 | ||
1381 | /* GLOBAL FUNCTION | |
1382 | ||
1383 | solib_add -- read in symbol info for newly added shared libraries | |
1384 | ||
1385 | SYNOPSIS | |
1386 | ||
1387 | void solib_add (char *pattern, int from_tty, struct target_ops *TARGET) | |
1388 | ||
1389 | DESCRIPTION | |
1390 | ||
1391 | Read in symbolic information for any shared objects whose names | |
1392 | match PATTERN. (If we've already read a shared object's symbol | |
1393 | info, leave it alone.) If PATTERN is zero, read them all. | |
1394 | ||
1395 | FROM_TTY and TARGET are as described for update_solib_list, above. */ | |
1396 | ||
1397 | void | |
1398 | solib_add (char *pattern, int from_tty, struct target_ops *target) | |
1399 | { | |
1400 | struct so_list *gdb; | |
1401 | ||
1402 | if (pattern) | |
1403 | { | |
1404 | char *re_err = re_comp (pattern); | |
1405 | ||
1406 | if (re_err) | |
1407 | error ("Invalid regexp: %s", re_err); | |
1408 | } | |
1409 | ||
1410 | update_solib_list (from_tty, target); | |
c906108c | 1411 | |
105b175f JB |
1412 | /* Walk the list of currently loaded shared libraries, and read |
1413 | symbols for any that match the pattern --- or any whose symbols | |
1414 | aren't already loaded, if no pattern was given. */ | |
e8930304 JB |
1415 | { |
1416 | int any_matches = 0; | |
1417 | int loaded_any_symbols = 0; | |
c906108c | 1418 | |
e8930304 JB |
1419 | for (gdb = so_list_head; gdb; gdb = gdb->next) |
1420 | if (! pattern || re_exec (gdb->so_name)) | |
1421 | { | |
1422 | any_matches = 1; | |
1423 | ||
1424 | if (gdb->symbols_loaded) | |
1425 | { | |
1426 | if (from_tty) | |
1427 | printf_unfiltered ("Symbols already loaded for %s\n", | |
1428 | gdb->so_name); | |
1429 | } | |
1430 | else | |
1431 | { | |
1432 | if (catch_errors | |
1433 | (symbol_add_stub, gdb, | |
1434 | "Error while reading shared library symbols:\n", | |
1435 | RETURN_MASK_ALL)) | |
1436 | { | |
1437 | if (from_tty) | |
1438 | printf_unfiltered ("Loaded symbols for %s\n", | |
1439 | gdb->so_name); | |
1440 | gdb->symbols_loaded = 1; | |
1441 | loaded_any_symbols = 1; | |
1442 | } | |
1443 | } | |
1444 | } | |
1445 | ||
1446 | if (from_tty && pattern && ! any_matches) | |
1447 | printf_unfiltered | |
1448 | ("No loaded shared libraries match the pattern `%s'.\n", pattern); | |
1449 | ||
1450 | if (loaded_any_symbols) | |
1451 | { | |
1452 | /* Getting new symbols may change our opinion about what is | |
1453 | frameless. */ | |
1454 | reinit_frame_cache (); | |
1455 | ||
1456 | special_symbol_handling (); | |
1457 | } | |
1458 | } | |
c906108c SS |
1459 | } |
1460 | ||
07cd4b97 | 1461 | |
c906108c SS |
1462 | /* |
1463 | ||
c5aa993b | 1464 | LOCAL FUNCTION |
c906108c | 1465 | |
c5aa993b | 1466 | info_sharedlibrary_command -- code for "info sharedlibrary" |
c906108c | 1467 | |
c5aa993b | 1468 | SYNOPSIS |
c906108c | 1469 | |
c5aa993b | 1470 | static void info_sharedlibrary_command () |
c906108c | 1471 | |
c5aa993b | 1472 | DESCRIPTION |
c906108c | 1473 | |
c5aa993b JM |
1474 | Walk through the shared library list and print information |
1475 | about each attached library. | |
1476 | */ | |
c906108c SS |
1477 | |
1478 | static void | |
1479 | info_sharedlibrary_command (ignore, from_tty) | |
1480 | char *ignore; | |
1481 | int from_tty; | |
1482 | { | |
c5aa993b | 1483 | register struct so_list *so = NULL; /* link map state variable */ |
c906108c SS |
1484 | int header_done = 0; |
1485 | int addr_width; | |
1486 | char *addr_fmt; | |
1487 | ||
1488 | if (exec_bfd == NULL) | |
1489 | { | |
4ce44c66 | 1490 | printf_unfiltered ("No executable file.\n"); |
c906108c SS |
1491 | return; |
1492 | } | |
1493 | ||
1494 | #ifndef TARGET_ELF64 | |
c5aa993b | 1495 | addr_width = 8 + 4; |
c906108c SS |
1496 | addr_fmt = "08l"; |
1497 | #else | |
c5aa993b | 1498 | addr_width = 16 + 4; |
c906108c SS |
1499 | addr_fmt = "016l"; |
1500 | #endif | |
1501 | ||
105b175f | 1502 | update_solib_list (from_tty, 0); |
07cd4b97 JB |
1503 | |
1504 | for (so = so_list_head; so; so = so->next) | |
c906108c | 1505 | { |
c5aa993b | 1506 | if (so->so_name[0]) |
c906108c SS |
1507 | { |
1508 | if (!header_done) | |
1509 | { | |
c5aa993b JM |
1510 | printf_unfiltered ("%-*s%-*s%-12s%s\n", addr_width, "From", |
1511 | addr_width, "To", "Syms Read", | |
1512 | "Shared Object Library"); | |
c906108c SS |
1513 | header_done++; |
1514 | } | |
1515 | ||
1516 | printf_unfiltered ("%-*s", addr_width, | |
c5aa993b JM |
1517 | local_hex_string_custom ((unsigned long) LM_ADDR (so), |
1518 | addr_fmt)); | |
c906108c | 1519 | printf_unfiltered ("%-*s", addr_width, |
c5aa993b JM |
1520 | local_hex_string_custom ((unsigned long) so->lmend, |
1521 | addr_fmt)); | |
1522 | printf_unfiltered ("%-12s", so->symbols_loaded ? "Yes" : "No"); | |
1523 | printf_unfiltered ("%s\n", so->so_name); | |
c906108c SS |
1524 | } |
1525 | } | |
1526 | if (so_list_head == NULL) | |
1527 | { | |
c5aa993b | 1528 | printf_unfiltered ("No shared libraries loaded at this time.\n"); |
c906108c SS |
1529 | } |
1530 | } | |
1531 | ||
1532 | /* | |
1533 | ||
c5aa993b | 1534 | GLOBAL FUNCTION |
c906108c | 1535 | |
c5aa993b | 1536 | solib_address -- check to see if an address is in a shared lib |
c906108c | 1537 | |
c5aa993b | 1538 | SYNOPSIS |
c906108c | 1539 | |
c5aa993b | 1540 | char * solib_address (CORE_ADDR address) |
c906108c | 1541 | |
c5aa993b | 1542 | DESCRIPTION |
c906108c | 1543 | |
c5aa993b JM |
1544 | Provides a hook for other gdb routines to discover whether or |
1545 | not a particular address is within the mapped address space of | |
1546 | a shared library. Any address between the base mapping address | |
1547 | and the first address beyond the end of the last mapping, is | |
1548 | considered to be within the shared library address space, for | |
1549 | our purposes. | |
c906108c | 1550 | |
c5aa993b JM |
1551 | For example, this routine is called at one point to disable |
1552 | breakpoints which are in shared libraries that are not currently | |
1553 | mapped in. | |
c906108c SS |
1554 | */ |
1555 | ||
1556 | char * | |
1557 | solib_address (address) | |
1558 | CORE_ADDR address; | |
1559 | { | |
c5aa993b JM |
1560 | register struct so_list *so = 0; /* link map state variable */ |
1561 | ||
07cd4b97 | 1562 | for (so = so_list_head; so; so = so->next) |
c906108c | 1563 | { |
07cd4b97 JB |
1564 | if (LM_ADDR (so) <= address && address < so->lmend) |
1565 | return (so->so_name); | |
c906108c | 1566 | } |
07cd4b97 | 1567 | |
c906108c SS |
1568 | return (0); |
1569 | } | |
1570 | ||
1571 | /* Called by free_all_symtabs */ | |
1572 | ||
c5aa993b | 1573 | void |
085dd6e6 | 1574 | clear_solib () |
c906108c | 1575 | { |
085dd6e6 JM |
1576 | /* This function is expected to handle ELF shared libraries. It is |
1577 | also used on Solaris, which can run either ELF or a.out binaries | |
1578 | (for compatibility with SunOS 4), both of which can use shared | |
1579 | libraries. So we don't know whether we have an ELF executable or | |
1580 | an a.out executable until the user chooses an executable file. | |
1581 | ||
1582 | ELF shared libraries don't get mapped into the address space | |
1583 | until after the program starts, so we'd better not try to insert | |
1584 | breakpoints in them immediately. We have to wait until the | |
1585 | dynamic linker has loaded them; we'll hit a bp_shlib_event | |
1586 | breakpoint (look for calls to create_solib_event_breakpoint) when | |
1587 | it's ready. | |
1588 | ||
1589 | SunOS shared libraries seem to be different --- they're present | |
1590 | as soon as the process begins execution, so there's no need to | |
1591 | put off inserting breakpoints. There's also nowhere to put a | |
1592 | bp_shlib_event breakpoint, so if we put it off, we'll never get | |
1593 | around to it. | |
1594 | ||
1595 | So: disable breakpoints only if we're using ELF shared libs. */ | |
1596 | if (exec_bfd != NULL | |
1597 | && bfd_get_flavour (exec_bfd) != bfd_target_aout_flavour) | |
1598 | disable_breakpoints_in_shlibs (1); | |
1599 | ||
c906108c SS |
1600 | while (so_list_head) |
1601 | { | |
07cd4b97 JB |
1602 | struct so_list *so = so_list_head; |
1603 | so_list_head = so->next; | |
1604 | free_so (so); | |
c906108c | 1605 | } |
07cd4b97 | 1606 | |
c906108c SS |
1607 | debug_base = 0; |
1608 | } | |
1609 | ||
1610 | static void | |
1611 | do_clear_solib (dummy) | |
1612 | PTR dummy; | |
1613 | { | |
1614 | solib_cleanup_queued = 0; | |
1615 | clear_solib (); | |
1616 | } | |
1617 | ||
1618 | #ifdef SVR4_SHARED_LIBS | |
1619 | ||
1620 | /* Return 1 if PC lies in the dynamic symbol resolution code of the | |
1621 | SVR4 run time loader. */ | |
1622 | ||
1623 | static CORE_ADDR interp_text_sect_low; | |
1624 | static CORE_ADDR interp_text_sect_high; | |
1625 | static CORE_ADDR interp_plt_sect_low; | |
1626 | static CORE_ADDR interp_plt_sect_high; | |
1627 | ||
1628 | int | |
1629 | in_svr4_dynsym_resolve_code (pc) | |
1630 | CORE_ADDR pc; | |
1631 | { | |
1632 | return ((pc >= interp_text_sect_low && pc < interp_text_sect_high) | |
1633 | || (pc >= interp_plt_sect_low && pc < interp_plt_sect_high) | |
1634 | || in_plt_section (pc, NULL)); | |
1635 | } | |
1636 | #endif | |
1637 | ||
1638 | /* | |
1639 | ||
c5aa993b | 1640 | LOCAL FUNCTION |
c906108c | 1641 | |
c5aa993b | 1642 | disable_break -- remove the "mapping changed" breakpoint |
c906108c | 1643 | |
c5aa993b | 1644 | SYNOPSIS |
c906108c | 1645 | |
c5aa993b | 1646 | static int disable_break () |
c906108c | 1647 | |
c5aa993b | 1648 | DESCRIPTION |
c906108c | 1649 | |
c5aa993b JM |
1650 | Removes the breakpoint that gets hit when the dynamic linker |
1651 | completes a mapping change. | |
c906108c | 1652 | |
c5aa993b | 1653 | */ |
c906108c SS |
1654 | |
1655 | #ifndef SVR4_SHARED_LIBS | |
1656 | ||
1657 | static int | |
1658 | disable_break () | |
1659 | { | |
1660 | int status = 1; | |
1661 | ||
1662 | #ifndef SVR4_SHARED_LIBS | |
1663 | ||
1664 | int in_debugger = 0; | |
c5aa993b | 1665 | |
c906108c SS |
1666 | /* Read the debugger structure from the inferior to retrieve the |
1667 | address of the breakpoint and the original contents of the | |
1668 | breakpoint address. Remove the breakpoint by writing the original | |
1669 | contents back. */ | |
1670 | ||
1671 | read_memory (debug_addr, (char *) &debug_copy, sizeof (debug_copy)); | |
1672 | ||
1673 | /* Set `in_debugger' to zero now. */ | |
1674 | ||
1675 | write_memory (flag_addr, (char *) &in_debugger, sizeof (in_debugger)); | |
1676 | ||
07cd4b97 | 1677 | breakpoint_addr = SOLIB_EXTRACT_ADDRESS (debug_copy.ldd_bp_addr); |
c906108c SS |
1678 | write_memory (breakpoint_addr, (char *) &debug_copy.ldd_bp_inst, |
1679 | sizeof (debug_copy.ldd_bp_inst)); | |
1680 | ||
c5aa993b | 1681 | #else /* SVR4_SHARED_LIBS */ |
c906108c SS |
1682 | |
1683 | /* Note that breakpoint address and original contents are in our address | |
1684 | space, so we just need to write the original contents back. */ | |
1685 | ||
1686 | if (memory_remove_breakpoint (breakpoint_addr, shadow_contents) != 0) | |
1687 | { | |
1688 | status = 0; | |
1689 | } | |
1690 | ||
c5aa993b | 1691 | #endif /* !SVR4_SHARED_LIBS */ |
c906108c SS |
1692 | |
1693 | /* For the SVR4 version, we always know the breakpoint address. For the | |
1694 | SunOS version we don't know it until the above code is executed. | |
1695 | Grumble if we are stopped anywhere besides the breakpoint address. */ | |
1696 | ||
1697 | if (stop_pc != breakpoint_addr) | |
1698 | { | |
1699 | warning ("stopped at unknown breakpoint while handling shared libraries"); | |
1700 | } | |
1701 | ||
1702 | return (status); | |
1703 | } | |
1704 | ||
c5aa993b | 1705 | #endif /* #ifdef SVR4_SHARED_LIBS */ |
c906108c SS |
1706 | |
1707 | /* | |
1708 | ||
c5aa993b JM |
1709 | LOCAL FUNCTION |
1710 | ||
1711 | enable_break -- arrange for dynamic linker to hit breakpoint | |
1712 | ||
1713 | SYNOPSIS | |
1714 | ||
1715 | int enable_break (void) | |
1716 | ||
1717 | DESCRIPTION | |
1718 | ||
1719 | Both the SunOS and the SVR4 dynamic linkers have, as part of their | |
1720 | debugger interface, support for arranging for the inferior to hit | |
1721 | a breakpoint after mapping in the shared libraries. This function | |
1722 | enables that breakpoint. | |
1723 | ||
1724 | For SunOS, there is a special flag location (in_debugger) which we | |
1725 | set to 1. When the dynamic linker sees this flag set, it will set | |
1726 | a breakpoint at a location known only to itself, after saving the | |
1727 | original contents of that place and the breakpoint address itself, | |
1728 | in it's own internal structures. When we resume the inferior, it | |
1729 | will eventually take a SIGTRAP when it runs into the breakpoint. | |
1730 | We handle this (in a different place) by restoring the contents of | |
1731 | the breakpointed location (which is only known after it stops), | |
1732 | chasing around to locate the shared libraries that have been | |
1733 | loaded, then resuming. | |
1734 | ||
1735 | For SVR4, the debugger interface structure contains a member (r_brk) | |
1736 | which is statically initialized at the time the shared library is | |
1737 | built, to the offset of a function (_r_debug_state) which is guaran- | |
1738 | teed to be called once before mapping in a library, and again when | |
1739 | the mapping is complete. At the time we are examining this member, | |
1740 | it contains only the unrelocated offset of the function, so we have | |
1741 | to do our own relocation. Later, when the dynamic linker actually | |
1742 | runs, it relocates r_brk to be the actual address of _r_debug_state(). | |
1743 | ||
1744 | The debugger interface structure also contains an enumeration which | |
1745 | is set to either RT_ADD or RT_DELETE prior to changing the mapping, | |
1746 | depending upon whether or not the library is being mapped or unmapped, | |
1747 | and then set to RT_CONSISTENT after the library is mapped/unmapped. | |
1748 | */ | |
c906108c SS |
1749 | |
1750 | static int | |
1751 | enable_break () | |
1752 | { | |
1753 | int success = 0; | |
1754 | ||
1755 | #ifndef SVR4_SHARED_LIBS | |
1756 | ||
1757 | int j; | |
1758 | int in_debugger; | |
1759 | ||
1760 | /* Get link_dynamic structure */ | |
1761 | ||
1762 | j = target_read_memory (debug_base, (char *) &dynamic_copy, | |
1763 | sizeof (dynamic_copy)); | |
1764 | if (j) | |
1765 | { | |
1766 | /* unreadable */ | |
1767 | return (0); | |
1768 | } | |
1769 | ||
1770 | /* Calc address of debugger interface structure */ | |
1771 | ||
07cd4b97 | 1772 | debug_addr = SOLIB_EXTRACT_ADDRESS (dynamic_copy.ldd); |
c906108c SS |
1773 | |
1774 | /* Calc address of `in_debugger' member of debugger interface structure */ | |
1775 | ||
1776 | flag_addr = debug_addr + (CORE_ADDR) ((char *) &debug_copy.ldd_in_debugger - | |
1777 | (char *) &debug_copy); | |
1778 | ||
1779 | /* Write a value of 1 to this member. */ | |
1780 | ||
1781 | in_debugger = 1; | |
1782 | write_memory (flag_addr, (char *) &in_debugger, sizeof (in_debugger)); | |
1783 | success = 1; | |
1784 | ||
c5aa993b | 1785 | #else /* SVR4_SHARED_LIBS */ |
c906108c SS |
1786 | |
1787 | #ifdef BKPT_AT_SYMBOL | |
1788 | ||
1789 | struct minimal_symbol *msymbol; | |
1790 | char **bkpt_namep; | |
1791 | asection *interp_sect; | |
1792 | ||
1793 | /* First, remove all the solib event breakpoints. Their addresses | |
1794 | may have changed since the last time we ran the program. */ | |
1795 | remove_solib_event_breakpoints (); | |
1796 | ||
1797 | #ifdef SVR4_SHARED_LIBS | |
1798 | interp_text_sect_low = interp_text_sect_high = 0; | |
1799 | interp_plt_sect_low = interp_plt_sect_high = 0; | |
1800 | ||
1801 | /* Find the .interp section; if not found, warn the user and drop | |
1802 | into the old breakpoint at symbol code. */ | |
1803 | interp_sect = bfd_get_section_by_name (exec_bfd, ".interp"); | |
1804 | if (interp_sect) | |
1805 | { | |
1806 | unsigned int interp_sect_size; | |
1807 | char *buf; | |
1808 | CORE_ADDR load_addr; | |
1809 | bfd *tmp_bfd; | |
1810 | CORE_ADDR sym_addr = 0; | |
1811 | ||
1812 | /* Read the contents of the .interp section into a local buffer; | |
c5aa993b | 1813 | the contents specify the dynamic linker this program uses. */ |
c906108c SS |
1814 | interp_sect_size = bfd_section_size (exec_bfd, interp_sect); |
1815 | buf = alloca (interp_sect_size); | |
1816 | bfd_get_section_contents (exec_bfd, interp_sect, | |
1817 | buf, 0, interp_sect_size); | |
1818 | ||
1819 | /* Now we need to figure out where the dynamic linker was | |
c5aa993b JM |
1820 | loaded so that we can load its symbols and place a breakpoint |
1821 | in the dynamic linker itself. | |
c906108c | 1822 | |
c5aa993b JM |
1823 | This address is stored on the stack. However, I've been unable |
1824 | to find any magic formula to find it for Solaris (appears to | |
1825 | be trivial on GNU/Linux). Therefore, we have to try an alternate | |
1826 | mechanism to find the dynamic linker's base address. */ | |
c906108c SS |
1827 | tmp_bfd = bfd_openr (buf, gnutarget); |
1828 | if (tmp_bfd == NULL) | |
1829 | goto bkpt_at_symbol; | |
1830 | ||
1831 | /* Make sure the dynamic linker's really a useful object. */ | |
1832 | if (!bfd_check_format (tmp_bfd, bfd_object)) | |
1833 | { | |
1834 | warning ("Unable to grok dynamic linker %s as an object file", buf); | |
1835 | bfd_close (tmp_bfd); | |
1836 | goto bkpt_at_symbol; | |
1837 | } | |
1838 | ||
1839 | /* We find the dynamic linker's base address by examining the | |
c5aa993b JM |
1840 | current pc (which point at the entry point for the dynamic |
1841 | linker) and subtracting the offset of the entry point. */ | |
c906108c SS |
1842 | load_addr = read_pc () - tmp_bfd->start_address; |
1843 | ||
1844 | /* Record the relocated start and end address of the dynamic linker | |
c5aa993b | 1845 | text and plt section for in_svr4_dynsym_resolve_code. */ |
c906108c SS |
1846 | interp_sect = bfd_get_section_by_name (tmp_bfd, ".text"); |
1847 | if (interp_sect) | |
1848 | { | |
1849 | interp_text_sect_low = | |
1850 | bfd_section_vma (tmp_bfd, interp_sect) + load_addr; | |
1851 | interp_text_sect_high = | |
1852 | interp_text_sect_low + bfd_section_size (tmp_bfd, interp_sect); | |
1853 | } | |
1854 | interp_sect = bfd_get_section_by_name (tmp_bfd, ".plt"); | |
1855 | if (interp_sect) | |
1856 | { | |
1857 | interp_plt_sect_low = | |
1858 | bfd_section_vma (tmp_bfd, interp_sect) + load_addr; | |
1859 | interp_plt_sect_high = | |
1860 | interp_plt_sect_low + bfd_section_size (tmp_bfd, interp_sect); | |
1861 | } | |
1862 | ||
1863 | /* Now try to set a breakpoint in the dynamic linker. */ | |
1864 | for (bkpt_namep = solib_break_names; *bkpt_namep != NULL; bkpt_namep++) | |
1865 | { | |
1866 | sym_addr = bfd_lookup_symbol (tmp_bfd, *bkpt_namep); | |
1867 | if (sym_addr != 0) | |
1868 | break; | |
1869 | } | |
1870 | ||
1871 | /* We're done with the temporary bfd. */ | |
1872 | bfd_close (tmp_bfd); | |
1873 | ||
1874 | if (sym_addr != 0) | |
1875 | { | |
1876 | create_solib_event_breakpoint (load_addr + sym_addr); | |
1877 | return 1; | |
1878 | } | |
1879 | ||
1880 | /* For whatever reason we couldn't set a breakpoint in the dynamic | |
c5aa993b JM |
1881 | linker. Warn and drop into the old code. */ |
1882 | bkpt_at_symbol: | |
c906108c SS |
1883 | warning ("Unable to find dynamic linker breakpoint function.\nGDB will be unable to debug shared library initializers\nand track explicitly loaded dynamic code."); |
1884 | } | |
1885 | #endif | |
1886 | ||
1887 | /* Scan through the list of symbols, trying to look up the symbol and | |
1888 | set a breakpoint there. Terminate loop when we/if we succeed. */ | |
1889 | ||
1890 | breakpoint_addr = 0; | |
1891 | for (bkpt_namep = bkpt_names; *bkpt_namep != NULL; bkpt_namep++) | |
1892 | { | |
1893 | msymbol = lookup_minimal_symbol (*bkpt_namep, NULL, symfile_objfile); | |
1894 | if ((msymbol != NULL) && (SYMBOL_VALUE_ADDRESS (msymbol) != 0)) | |
1895 | { | |
1896 | create_solib_event_breakpoint (SYMBOL_VALUE_ADDRESS (msymbol)); | |
1897 | return 1; | |
1898 | } | |
1899 | } | |
1900 | ||
1901 | /* Nothing good happened. */ | |
1902 | success = 0; | |
1903 | ||
c5aa993b | 1904 | #endif /* BKPT_AT_SYMBOL */ |
c906108c | 1905 | |
c5aa993b | 1906 | #endif /* !SVR4_SHARED_LIBS */ |
c906108c SS |
1907 | |
1908 | return (success); | |
1909 | } | |
c5aa993b | 1910 | |
c906108c | 1911 | /* |
c5aa993b JM |
1912 | |
1913 | GLOBAL FUNCTION | |
1914 | ||
1915 | solib_create_inferior_hook -- shared library startup support | |
1916 | ||
1917 | SYNOPSIS | |
1918 | ||
1919 | void solib_create_inferior_hook() | |
1920 | ||
1921 | DESCRIPTION | |
1922 | ||
1923 | When gdb starts up the inferior, it nurses it along (through the | |
1924 | shell) until it is ready to execute it's first instruction. At this | |
1925 | point, this function gets called via expansion of the macro | |
1926 | SOLIB_CREATE_INFERIOR_HOOK. | |
1927 | ||
1928 | For SunOS executables, this first instruction is typically the | |
1929 | one at "_start", or a similar text label, regardless of whether | |
1930 | the executable is statically or dynamically linked. The runtime | |
1931 | startup code takes care of dynamically linking in any shared | |
1932 | libraries, once gdb allows the inferior to continue. | |
1933 | ||
1934 | For SVR4 executables, this first instruction is either the first | |
1935 | instruction in the dynamic linker (for dynamically linked | |
1936 | executables) or the instruction at "start" for statically linked | |
1937 | executables. For dynamically linked executables, the system | |
1938 | first exec's /lib/libc.so.N, which contains the dynamic linker, | |
1939 | and starts it running. The dynamic linker maps in any needed | |
1940 | shared libraries, maps in the actual user executable, and then | |
1941 | jumps to "start" in the user executable. | |
1942 | ||
1943 | For both SunOS shared libraries, and SVR4 shared libraries, we | |
1944 | can arrange to cooperate with the dynamic linker to discover the | |
1945 | names of shared libraries that are dynamically linked, and the | |
1946 | base addresses to which they are linked. | |
1947 | ||
1948 | This function is responsible for discovering those names and | |
1949 | addresses, and saving sufficient information about them to allow | |
1950 | their symbols to be read at a later time. | |
1951 | ||
1952 | FIXME | |
1953 | ||
1954 | Between enable_break() and disable_break(), this code does not | |
1955 | properly handle hitting breakpoints which the user might have | |
1956 | set in the startup code or in the dynamic linker itself. Proper | |
1957 | handling will probably have to wait until the implementation is | |
1958 | changed to use the "breakpoint handler function" method. | |
1959 | ||
1960 | Also, what if child has exit()ed? Must exit loop somehow. | |
1961 | */ | |
1962 | ||
1963 | void | |
1964 | solib_create_inferior_hook () | |
c906108c SS |
1965 | { |
1966 | /* If we are using the BKPT_AT_SYMBOL code, then we don't need the base | |
1967 | yet. In fact, in the case of a SunOS4 executable being run on | |
07cd4b97 | 1968 | Solaris, we can't get it yet. current_sos will get it when it needs |
c906108c SS |
1969 | it. */ |
1970 | #if !(defined (SVR4_SHARED_LIBS) && defined (BKPT_AT_SYMBOL)) | |
1971 | if ((debug_base = locate_base ()) == 0) | |
1972 | { | |
1973 | /* Can't find the symbol or the executable is statically linked. */ | |
1974 | return; | |
1975 | } | |
1976 | #endif | |
1977 | ||
1978 | if (!enable_break ()) | |
1979 | { | |
1980 | warning ("shared library handler failed to enable breakpoint"); | |
1981 | return; | |
1982 | } | |
1983 | ||
1984 | #if !defined(SVR4_SHARED_LIBS) || defined(_SCO_DS) | |
1985 | /* SCO and SunOS need the loop below, other systems should be using the | |
1986 | special shared library breakpoints and the shared library breakpoint | |
1987 | service routine. | |
1988 | ||
1989 | Now run the target. It will eventually hit the breakpoint, at | |
1990 | which point all of the libraries will have been mapped in and we | |
1991 | can go groveling around in the dynamic linker structures to find | |
1992 | out what we need to know about them. */ | |
1993 | ||
1994 | clear_proceed_status (); | |
1995 | stop_soon_quietly = 1; | |
1996 | stop_signal = TARGET_SIGNAL_0; | |
1997 | do | |
1998 | { | |
1999 | target_resume (-1, 0, stop_signal); | |
2000 | wait_for_inferior (); | |
2001 | } | |
2002 | while (stop_signal != TARGET_SIGNAL_TRAP); | |
2003 | stop_soon_quietly = 0; | |
2004 | ||
2005 | #if !defined(_SCO_DS) | |
2006 | /* We are now either at the "mapping complete" breakpoint (or somewhere | |
2007 | else, a condition we aren't prepared to deal with anyway), so adjust | |
2008 | the PC as necessary after a breakpoint, disable the breakpoint, and | |
2009 | add any shared libraries that were mapped in. */ | |
2010 | ||
2011 | if (DECR_PC_AFTER_BREAK) | |
2012 | { | |
2013 | stop_pc -= DECR_PC_AFTER_BREAK; | |
2014 | write_register (PC_REGNUM, stop_pc); | |
2015 | } | |
2016 | ||
2017 | if (!disable_break ()) | |
2018 | { | |
2019 | warning ("shared library handler failed to disable breakpoint"); | |
2020 | } | |
2021 | ||
2022 | if (auto_solib_add) | |
2023 | solib_add ((char *) 0, 0, (struct target_ops *) 0); | |
2024 | #endif /* ! _SCO_DS */ | |
2025 | #endif | |
2026 | } | |
2027 | ||
2028 | /* | |
2029 | ||
c5aa993b | 2030 | LOCAL FUNCTION |
c906108c | 2031 | |
c5aa993b | 2032 | special_symbol_handling -- additional shared library symbol handling |
c906108c | 2033 | |
c5aa993b | 2034 | SYNOPSIS |
c906108c | 2035 | |
07cd4b97 | 2036 | void special_symbol_handling () |
c906108c | 2037 | |
c5aa993b | 2038 | DESCRIPTION |
c906108c | 2039 | |
c5aa993b JM |
2040 | Once the symbols from a shared object have been loaded in the usual |
2041 | way, we are called to do any system specific symbol handling that | |
2042 | is needed. | |
c906108c | 2043 | |
c5aa993b JM |
2044 | For SunOS4, this consists of grunging around in the dynamic |
2045 | linkers structures to find symbol definitions for "common" symbols | |
2046 | and adding them to the minimal symbol table for the runtime common | |
2047 | objfile. | |
c906108c | 2048 | |
c5aa993b | 2049 | */ |
c906108c SS |
2050 | |
2051 | static void | |
07cd4b97 | 2052 | special_symbol_handling () |
c906108c SS |
2053 | { |
2054 | #ifndef SVR4_SHARED_LIBS | |
2055 | int j; | |
2056 | ||
2057 | if (debug_addr == 0) | |
2058 | { | |
2059 | /* Get link_dynamic structure */ | |
2060 | ||
2061 | j = target_read_memory (debug_base, (char *) &dynamic_copy, | |
2062 | sizeof (dynamic_copy)); | |
2063 | if (j) | |
2064 | { | |
2065 | /* unreadable */ | |
2066 | return; | |
2067 | } | |
2068 | ||
2069 | /* Calc address of debugger interface structure */ | |
2070 | /* FIXME, this needs work for cross-debugging of core files | |
c5aa993b | 2071 | (byteorder, size, alignment, etc). */ |
c906108c | 2072 | |
07cd4b97 | 2073 | debug_addr = SOLIB_EXTRACT_ADDRESS (dynamic_copy.ldd); |
c906108c SS |
2074 | } |
2075 | ||
2076 | /* Read the debugger structure from the inferior, just to make sure | |
2077 | we have a current copy. */ | |
2078 | ||
2079 | j = target_read_memory (debug_addr, (char *) &debug_copy, | |
2080 | sizeof (debug_copy)); | |
2081 | if (j) | |
c5aa993b | 2082 | return; /* unreadable */ |
c906108c SS |
2083 | |
2084 | /* Get common symbol definitions for the loaded object. */ | |
2085 | ||
2086 | if (debug_copy.ldd_cp) | |
2087 | { | |
07cd4b97 | 2088 | solib_add_common_symbols (SOLIB_EXTRACT_ADDRESS (debug_copy.ldd_cp)); |
c906108c SS |
2089 | } |
2090 | ||
c5aa993b | 2091 | #endif /* !SVR4_SHARED_LIBS */ |
c906108c SS |
2092 | } |
2093 | ||
2094 | ||
2095 | /* | |
2096 | ||
c5aa993b | 2097 | LOCAL FUNCTION |
c906108c | 2098 | |
c5aa993b | 2099 | sharedlibrary_command -- handle command to explicitly add library |
c906108c | 2100 | |
c5aa993b | 2101 | SYNOPSIS |
c906108c | 2102 | |
c5aa993b | 2103 | static void sharedlibrary_command (char *args, int from_tty) |
c906108c | 2104 | |
c5aa993b | 2105 | DESCRIPTION |
c906108c | 2106 | |
c5aa993b | 2107 | */ |
c906108c SS |
2108 | |
2109 | static void | |
2110 | sharedlibrary_command (args, from_tty) | |
c5aa993b JM |
2111 | char *args; |
2112 | int from_tty; | |
c906108c SS |
2113 | { |
2114 | dont_repeat (); | |
2115 | solib_add (args, from_tty, (struct target_ops *) 0); | |
2116 | } | |
2117 | ||
2118 | #endif /* HAVE_LINK_H */ | |
2119 | ||
2120 | void | |
c5aa993b | 2121 | _initialize_solib () |
c906108c SS |
2122 | { |
2123 | #ifdef HAVE_LINK_H | |
2124 | ||
2125 | add_com ("sharedlibrary", class_files, sharedlibrary_command, | |
2126 | "Load shared object library symbols for files matching REGEXP."); | |
c5aa993b | 2127 | add_info ("sharedlibrary", info_sharedlibrary_command, |
c906108c SS |
2128 | "Status of loaded shared object libraries."); |
2129 | ||
2130 | add_show_from_set | |
2131 | (add_set_cmd ("auto-solib-add", class_support, var_zinteger, | |
2132 | (char *) &auto_solib_add, | |
2133 | "Set autoloading of shared library symbols.\n\ | |
2134 | If nonzero, symbols from all shared object libraries will be loaded\n\ | |
2135 | automatically when the inferior begins execution or when the dynamic linker\n\ | |
2136 | informs gdb that a new library has been loaded. Otherwise, symbols\n\ | |
2137 | must be loaded manually, using `sharedlibrary'.", | |
2138 | &setlist), | |
2139 | &showlist); | |
2140 | ||
2141 | add_show_from_set | |
2142 | (add_set_cmd ("solib-absolute-prefix", class_support, var_filename, | |
2143 | (char *) &solib_absolute_prefix, | |
2144 | "Set prefix for loading absolute shared library symbol files.\n\ | |
2145 | For other (relative) files, you can add values using `set solib-search-path'.", | |
2146 | &setlist), | |
2147 | &showlist); | |
2148 | add_show_from_set | |
2149 | (add_set_cmd ("solib-search-path", class_support, var_string, | |
2150 | (char *) &solib_search_path, | |
2151 | "Set the search path for loading non-absolute shared library symbol files.\n\ | |
2152 | This takes precedence over the environment variables PATH and LD_LIBRARY_PATH.", | |
2153 | &setlist), | |
2154 | &showlist); | |
2155 | ||
2156 | #endif /* HAVE_LINK_H */ | |
2157 | } |