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 (); | |
56e290f4 | 448 | make_cleanup_discard_minimal_symbols (); |
c906108c SS |
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; | |
f5b8946c | 713 | int arch_size; |
c906108c SS |
714 | |
715 | /* Find the start address of the .dynamic section. */ | |
716 | dyninfo_sect = bfd_get_section_by_name (exec_bfd, ".dynamic"); | |
717 | if (dyninfo_sect == NULL) | |
718 | return 0; | |
719 | dyninfo_addr = bfd_section_vma (exec_bfd, dyninfo_sect); | |
720 | ||
721 | /* Read in .dynamic section, silently ignore errors. */ | |
722 | dyninfo_sect_size = bfd_section_size (exec_bfd, dyninfo_sect); | |
723 | buf = alloca (dyninfo_sect_size); | |
724 | if (target_read_memory (dyninfo_addr, buf, dyninfo_sect_size)) | |
725 | return 0; | |
726 | ||
727 | /* Find the DT_DEBUG entry in the the .dynamic section. | |
728 | For mips elf we look for DT_MIPS_RLD_MAP, mips elf apparently has | |
729 | no DT_DEBUG entries. */ | |
f5b8946c MS |
730 | |
731 | arch_size = bfd_elf_get_arch_size (exec_bfd); | |
732 | if (arch_size == -1) /* failure */ | |
733 | return 0; | |
734 | ||
735 | if (arch_size == 32) | |
736 | { /* 32-bit elf */ | |
737 | for (bufend = buf + dyninfo_sect_size; | |
738 | buf < bufend; | |
739 | buf += sizeof (Elf32_External_Dyn)) | |
c906108c | 740 | { |
f5b8946c MS |
741 | Elf32_External_Dyn *x_dynp = (Elf32_External_Dyn *) buf; |
742 | long dyn_tag; | |
743 | CORE_ADDR dyn_ptr; | |
744 | ||
745 | dyn_tag = bfd_h_get_32 (exec_bfd, (bfd_byte *) x_dynp->d_tag); | |
746 | if (dyn_tag == DT_NULL) | |
747 | break; | |
748 | else if (dyn_tag == DT_DEBUG) | |
749 | { | |
750 | dyn_ptr = bfd_h_get_32 (exec_bfd, | |
751 | (bfd_byte *) x_dynp->d_un.d_ptr); | |
752 | return dyn_ptr; | |
753 | } | |
c906108c | 754 | #ifdef DT_MIPS_RLD_MAP |
f5b8946c MS |
755 | else if (dyn_tag == DT_MIPS_RLD_MAP) |
756 | { | |
757 | char pbuf[TARGET_PTR_BIT / HOST_CHAR_BIT]; | |
758 | ||
759 | /* DT_MIPS_RLD_MAP contains a pointer to the address | |
760 | of the dynamic link structure. */ | |
761 | dyn_ptr = bfd_h_get_32 (exec_bfd, | |
762 | (bfd_byte *) x_dynp->d_un.d_ptr); | |
763 | if (target_read_memory (dyn_ptr, pbuf, sizeof (pbuf))) | |
764 | return 0; | |
765 | return extract_unsigned_integer (pbuf, sizeof (pbuf)); | |
766 | } | |
c906108c | 767 | #endif |
f5b8946c | 768 | } |
c906108c | 769 | } |
f5b8946c | 770 | else /* 64-bit elf */ |
c906108c | 771 | { |
f5b8946c MS |
772 | for (bufend = buf + dyninfo_sect_size; |
773 | buf < bufend; | |
774 | buf += sizeof (Elf64_External_Dyn)) | |
c906108c | 775 | { |
f5b8946c MS |
776 | Elf64_External_Dyn *x_dynp = (Elf64_External_Dyn *) buf; |
777 | long dyn_tag; | |
778 | CORE_ADDR dyn_ptr; | |
779 | ||
780 | dyn_tag = bfd_h_get_64 (exec_bfd, (bfd_byte *) x_dynp->d_tag); | |
781 | if (dyn_tag == DT_NULL) | |
782 | break; | |
783 | else if (dyn_tag == DT_DEBUG) | |
784 | { | |
785 | dyn_ptr = bfd_h_get_64 (exec_bfd, | |
786 | (bfd_byte *) x_dynp->d_un.d_ptr); | |
787 | return dyn_ptr; | |
788 | } | |
c906108c SS |
789 | } |
790 | } | |
c906108c SS |
791 | |
792 | /* DT_DEBUG entry not found. */ | |
793 | return 0; | |
794 | } | |
795 | ||
c5aa993b | 796 | #endif /* SVR4_SHARED_LIBS */ |
c906108c SS |
797 | |
798 | /* | |
799 | ||
c5aa993b | 800 | LOCAL FUNCTION |
c906108c | 801 | |
c5aa993b | 802 | locate_base -- locate the base address of dynamic linker structs |
c906108c | 803 | |
c5aa993b | 804 | SYNOPSIS |
c906108c | 805 | |
c5aa993b | 806 | CORE_ADDR locate_base (void) |
c906108c | 807 | |
c5aa993b | 808 | DESCRIPTION |
c906108c | 809 | |
c5aa993b JM |
810 | For both the SunOS and SVR4 shared library implementations, if the |
811 | inferior executable has been linked dynamically, there is a single | |
812 | address somewhere in the inferior's data space which is the key to | |
813 | locating all of the dynamic linker's runtime structures. This | |
814 | address is the value of the debug base symbol. The job of this | |
815 | function is to find and return that address, or to return 0 if there | |
816 | is no such address (the executable is statically linked for example). | |
c906108c | 817 | |
c5aa993b JM |
818 | For SunOS, the job is almost trivial, since the dynamic linker and |
819 | all of it's structures are statically linked to the executable at | |
820 | link time. Thus the symbol for the address we are looking for has | |
821 | already been added to the minimal symbol table for the executable's | |
822 | objfile at the time the symbol file's symbols were read, and all we | |
823 | have to do is look it up there. Note that we explicitly do NOT want | |
824 | to find the copies in the shared library. | |
c906108c | 825 | |
c5aa993b JM |
826 | The SVR4 version is a bit more complicated because the address |
827 | is contained somewhere in the dynamic info section. We have to go | |
828 | to a lot more work to discover the address of the debug base symbol. | |
829 | Because of this complexity, we cache the value we find and return that | |
830 | value on subsequent invocations. Note there is no copy in the | |
831 | executable symbol tables. | |
c906108c SS |
832 | |
833 | */ | |
834 | ||
835 | static CORE_ADDR | |
836 | locate_base () | |
837 | { | |
838 | ||
839 | #ifndef SVR4_SHARED_LIBS | |
840 | ||
841 | struct minimal_symbol *msymbol; | |
842 | CORE_ADDR address = 0; | |
843 | char **symbolp; | |
844 | ||
845 | /* For SunOS, we want to limit the search for the debug base symbol to the | |
846 | executable being debugged, since there is a duplicate named symbol in the | |
847 | shared library. We don't want the shared library versions. */ | |
848 | ||
849 | for (symbolp = debug_base_symbols; *symbolp != NULL; symbolp++) | |
850 | { | |
851 | msymbol = lookup_minimal_symbol (*symbolp, NULL, symfile_objfile); | |
852 | if ((msymbol != NULL) && (SYMBOL_VALUE_ADDRESS (msymbol) != 0)) | |
853 | { | |
854 | address = SYMBOL_VALUE_ADDRESS (msymbol); | |
855 | return (address); | |
856 | } | |
857 | } | |
858 | return (0); | |
859 | ||
c5aa993b | 860 | #else /* SVR4_SHARED_LIBS */ |
c906108c SS |
861 | |
862 | /* Check to see if we have a currently valid address, and if so, avoid | |
863 | doing all this work again and just return the cached address. If | |
864 | we have no cached address, try to locate it in the dynamic info | |
865 | section for ELF executables. */ | |
866 | ||
867 | if (debug_base == 0) | |
868 | { | |
869 | if (exec_bfd != NULL | |
870 | && bfd_get_flavour (exec_bfd) == bfd_target_elf_flavour) | |
871 | debug_base = elf_locate_base (); | |
872 | #ifdef HANDLE_SVR4_EXEC_EMULATORS | |
873 | /* Try it the hard way for emulated executables. */ | |
874 | else if (inferior_pid != 0 && target_has_execution) | |
875 | proc_iterate_over_mappings (look_for_base); | |
876 | #endif | |
877 | } | |
878 | return (debug_base); | |
879 | ||
c5aa993b | 880 | #endif /* !SVR4_SHARED_LIBS */ |
c906108c SS |
881 | |
882 | } | |
883 | ||
884 | /* | |
885 | ||
c5aa993b | 886 | LOCAL FUNCTION |
c906108c | 887 | |
c5aa993b | 888 | first_link_map_member -- locate first member in dynamic linker's map |
c906108c | 889 | |
c5aa993b | 890 | SYNOPSIS |
c906108c | 891 | |
07cd4b97 | 892 | static CORE_ADDR first_link_map_member (void) |
c906108c | 893 | |
c5aa993b | 894 | DESCRIPTION |
c906108c | 895 | |
9ddea9f1 JB |
896 | Find the first element in the inferior's dynamic link map, and |
897 | return its address in the inferior. This function doesn't copy the | |
07cd4b97 | 898 | link map entry itself into our address space; current_sos actually |
9ddea9f1 | 899 | does the reading. */ |
c906108c | 900 | |
07cd4b97 | 901 | static CORE_ADDR |
c906108c SS |
902 | first_link_map_member () |
903 | { | |
07cd4b97 | 904 | CORE_ADDR lm = 0; |
c906108c SS |
905 | |
906 | #ifndef SVR4_SHARED_LIBS | |
907 | ||
908 | read_memory (debug_base, (char *) &dynamic_copy, sizeof (dynamic_copy)); | |
909 | if (dynamic_copy.ld_version >= 2) | |
910 | { | |
911 | /* It is a version that we can deal with, so read in the secondary | |
c5aa993b | 912 | structure and find the address of the link map list from it. */ |
07cd4b97 JB |
913 | read_memory (SOLIB_EXTRACT_ADDRESS (dynamic_copy.ld_un.ld_2), |
914 | (char *) &ld_2_copy, sizeof (struct link_dynamic_2)); | |
915 | lm = SOLIB_EXTRACT_ADDRESS (ld_2_copy.ld_loaded); | |
c906108c SS |
916 | } |
917 | ||
c5aa993b | 918 | #else /* SVR4_SHARED_LIBS */ |
c906108c SS |
919 | |
920 | read_memory (debug_base, (char *) &debug_copy, sizeof (struct r_debug)); | |
921 | /* FIXME: Perhaps we should validate the info somehow, perhaps by | |
922 | checking r_version for a known version number, or r_state for | |
923 | RT_CONSISTENT. */ | |
07cd4b97 | 924 | lm = SOLIB_EXTRACT_ADDRESS (debug_copy.r_map); |
c906108c | 925 | |
c5aa993b | 926 | #endif /* !SVR4_SHARED_LIBS */ |
c906108c SS |
927 | |
928 | return (lm); | |
929 | } | |
930 | ||
104c1213 JM |
931 | #ifdef SVR4_SHARED_LIBS |
932 | /* | |
933 | ||
934 | LOCAL FUNCTION | |
935 | ||
9452d09b | 936 | open_symbol_file_object |
104c1213 JM |
937 | |
938 | SYNOPSIS | |
939 | ||
940 | void open_symbol_file_object (int from_tty) | |
941 | ||
942 | DESCRIPTION | |
943 | ||
944 | If no open symbol file, attempt to locate and open the main symbol | |
945 | file. On SVR4 systems, this is the first link map entry. If its | |
946 | name is here, we can open it. Useful when attaching to a process | |
947 | without first loading its symbol file. | |
948 | ||
949 | */ | |
950 | ||
9452d09b MS |
951 | static int |
952 | open_symbol_file_object (from_ttyp) | |
953 | int *from_ttyp; /* sneak past catch_errors */ | |
104c1213 | 954 | { |
07cd4b97 JB |
955 | CORE_ADDR lm; |
956 | struct link_map lmcopy; | |
104c1213 JM |
957 | char *filename; |
958 | int errcode; | |
959 | ||
960 | if (symfile_objfile) | |
961 | if (!query ("Attempt to reload symbols from process? ")) | |
962 | return 0; | |
963 | ||
964 | if ((debug_base = locate_base ()) == 0) | |
965 | return 0; /* failed somehow... */ | |
966 | ||
967 | /* First link map member should be the executable. */ | |
07cd4b97 | 968 | if ((lm = first_link_map_member ()) == 0) |
104c1213 JM |
969 | return 0; /* failed somehow... */ |
970 | ||
971 | /* Read from target memory to GDB. */ | |
07cd4b97 | 972 | read_memory (lm, (void *) &lmcopy, sizeof (lmcopy)); |
104c1213 JM |
973 | |
974 | if (lmcopy.l_name == 0) | |
975 | return 0; /* no filename. */ | |
976 | ||
977 | /* Now fetch the filename from target memory. */ | |
07cd4b97 | 978 | target_read_string (SOLIB_EXTRACT_ADDRESS (lmcopy.l_name), &filename, |
104c1213 JM |
979 | MAX_PATH_SIZE - 1, &errcode); |
980 | if (errcode) | |
981 | { | |
982 | warning ("failed to read exec filename from attached file: %s", | |
983 | safe_strerror (errcode)); | |
984 | return 0; | |
985 | } | |
986 | ||
987 | make_cleanup ((make_cleanup_func) free, (void *) filename); | |
988 | /* Have a pathname: read the symbol file. */ | |
9452d09b | 989 | symbol_file_command (filename, *from_ttyp); |
104c1213 JM |
990 | |
991 | return 1; | |
992 | } | |
993 | #endif /* SVR4_SHARED_LIBS */ | |
994 | ||
c906108c | 995 | |
07cd4b97 | 996 | /* LOCAL FUNCTION |
c906108c | 997 | |
07cd4b97 | 998 | free_so --- free a `struct so_list' object |
c906108c | 999 | |
c5aa993b | 1000 | SYNOPSIS |
c906108c | 1001 | |
07cd4b97 | 1002 | void free_so (struct so_list *so) |
c906108c | 1003 | |
c5aa993b | 1004 | DESCRIPTION |
c906108c | 1005 | |
07cd4b97 JB |
1006 | Free the storage associated with the `struct so_list' object SO. |
1007 | If we have opened a BFD for SO, close it. | |
c906108c | 1008 | |
07cd4b97 JB |
1009 | The caller is responsible for removing SO from whatever list it is |
1010 | a member of. If we have placed SO's sections in some target's | |
1011 | section table, the caller is responsible for removing them. | |
c906108c | 1012 | |
07cd4b97 JB |
1013 | This function doesn't mess with objfiles at all. If there is an |
1014 | objfile associated with SO that needs to be removed, the caller is | |
1015 | responsible for taking care of that. */ | |
1016 | ||
1017 | static void | |
1018 | free_so (struct so_list *so) | |
c906108c | 1019 | { |
07cd4b97 | 1020 | char *bfd_filename = 0; |
c5aa993b | 1021 | |
07cd4b97 JB |
1022 | if (so->sections) |
1023 | free (so->sections); | |
1024 | ||
1025 | if (so->abfd) | |
c906108c | 1026 | { |
07cd4b97 JB |
1027 | bfd_filename = bfd_get_filename (so->abfd); |
1028 | if (! bfd_close (so->abfd)) | |
1029 | warning ("cannot close \"%s\": %s", | |
1030 | bfd_filename, bfd_errmsg (bfd_get_error ())); | |
c906108c | 1031 | } |
07cd4b97 JB |
1032 | |
1033 | if (bfd_filename) | |
1034 | free (bfd_filename); | |
1035 | ||
1036 | free (so); | |
1037 | } | |
1038 | ||
1039 | ||
1040 | /* On some systems, the only way to recognize the link map entry for | |
1041 | the main executable file is by looking at its name. Return | |
1042 | non-zero iff SONAME matches one of the known main executable names. */ | |
1043 | ||
1044 | static int | |
1045 | match_main (soname) | |
1046 | char *soname; | |
1047 | { | |
1048 | char **mainp; | |
1049 | ||
1050 | for (mainp = main_name_list; *mainp != NULL; mainp++) | |
c906108c | 1051 | { |
07cd4b97 JB |
1052 | if (strcmp (soname, *mainp) == 0) |
1053 | return (1); | |
c906108c | 1054 | } |
07cd4b97 JB |
1055 | |
1056 | return (0); | |
1057 | } | |
1058 | ||
1059 | ||
1060 | /* LOCAL FUNCTION | |
1061 | ||
1062 | current_sos -- build a list of currently loaded shared objects | |
1063 | ||
1064 | SYNOPSIS | |
1065 | ||
1066 | struct so_list *current_sos () | |
1067 | ||
1068 | DESCRIPTION | |
1069 | ||
1070 | Build a list of `struct so_list' objects describing the shared | |
1071 | objects currently loaded in the inferior. This list does not | |
1072 | include an entry for the main executable file. | |
1073 | ||
1074 | Note that we only gather information directly available from the | |
1075 | inferior --- we don't examine any of the shared library files | |
1076 | themselves. The declaration of `struct so_list' says which fields | |
1077 | we provide values for. */ | |
1078 | ||
1079 | static struct so_list * | |
1080 | current_sos () | |
1081 | { | |
1082 | CORE_ADDR lm; | |
1083 | struct so_list *head = 0; | |
1084 | struct so_list **link_ptr = &head; | |
1085 | ||
1086 | /* Make sure we've looked up the inferior's dynamic linker's base | |
1087 | structure. */ | |
1088 | if (! debug_base) | |
c906108c | 1089 | { |
07cd4b97 JB |
1090 | debug_base = locate_base (); |
1091 | ||
1092 | /* If we can't find the dynamic linker's base structure, this | |
1093 | must not be a dynamically linked executable. Hmm. */ | |
1094 | if (! debug_base) | |
1095 | return 0; | |
1096 | } | |
1097 | ||
1098 | /* Walk the inferior's link map list, and build our list of | |
1099 | `struct so_list' nodes. */ | |
1100 | lm = first_link_map_member (); | |
1101 | while (lm) | |
1102 | { | |
1103 | struct so_list *new | |
1104 | = (struct so_list *) xmalloc (sizeof (struct so_list)); | |
15588ebb | 1105 | struct cleanup *old_chain = make_cleanup (free, new); |
07cd4b97 JB |
1106 | memset (new, 0, sizeof (*new)); |
1107 | ||
c5aa993b | 1108 | new->lmaddr = lm; |
07cd4b97 | 1109 | read_memory (lm, (char *) &(new->lm), sizeof (struct link_map)); |
c906108c | 1110 | |
07cd4b97 | 1111 | lm = LM_NEXT (new); |
c5aa993b | 1112 | |
c906108c | 1113 | /* For SVR4 versions, the first entry in the link map is for the |
c5aa993b JM |
1114 | inferior executable, so we must ignore it. For some versions of |
1115 | SVR4, it has no name. For others (Solaris 2.3 for example), it | |
1116 | does have a name, so we can no longer use a missing name to | |
1117 | decide when to ignore it. */ | |
07cd4b97 | 1118 | if (IGNORE_FIRST_LINK_MAP_ENTRY (new)) |
15588ebb | 1119 | free_so (new); |
07cd4b97 | 1120 | else |
c906108c SS |
1121 | { |
1122 | int errcode; | |
1123 | char *buffer; | |
07cd4b97 JB |
1124 | |
1125 | /* Extract this shared object's name. */ | |
1126 | target_read_string (LM_NAME (new), &buffer, | |
c906108c SS |
1127 | MAX_PATH_SIZE - 1, &errcode); |
1128 | if (errcode != 0) | |
1129 | { | |
07cd4b97 | 1130 | warning ("current_sos: Can't read pathname for load map: %s\n", |
c906108c | 1131 | safe_strerror (errcode)); |
c906108c | 1132 | } |
07cd4b97 JB |
1133 | else |
1134 | { | |
1135 | strncpy (new->so_name, buffer, MAX_PATH_SIZE - 1); | |
1136 | new->so_name[MAX_PATH_SIZE - 1] = '\0'; | |
1137 | free (buffer); | |
1138 | strcpy (new->so_original_name, new->so_name); | |
1139 | } | |
1140 | ||
1141 | /* If this entry has no name, or its name matches the name | |
1142 | for the main executable, don't include it in the list. */ | |
1143 | if (! new->so_name[0] | |
1144 | || match_main (new->so_name)) | |
1145 | free_so (new); | |
1146 | else | |
1147 | { | |
1148 | new->next = 0; | |
1149 | *link_ptr = new; | |
1150 | link_ptr = &new->next; | |
1151 | } | |
c5aa993b | 1152 | } |
15588ebb JB |
1153 | |
1154 | discard_cleanups (old_chain); | |
c906108c | 1155 | } |
07cd4b97 JB |
1156 | |
1157 | return head; | |
c906108c SS |
1158 | } |
1159 | ||
07cd4b97 | 1160 | |
c906108c SS |
1161 | /* A small stub to get us past the arg-passing pinhole of catch_errors. */ |
1162 | ||
1163 | static int | |
1164 | symbol_add_stub (arg) | |
1165 | PTR arg; | |
1166 | { | |
07cd4b97 | 1167 | register struct so_list *so = (struct so_list *) arg; /* catch_errs bogon */ |
62557bbc | 1168 | struct section_addr_info *sap; |
9e124216 EZ |
1169 | CORE_ADDR lowest_addr = 0; |
1170 | int lowest_index; | |
1171 | asection *lowest_sect = NULL; | |
c906108c | 1172 | |
07cd4b97 JB |
1173 | /* Have we already loaded this shared object? */ |
1174 | ALL_OBJFILES (so->objfile) | |
1175 | { | |
1176 | if (strcmp (so->objfile->name, so->so_name) == 0) | |
1177 | return 1; | |
1178 | } | |
1179 | ||
1180 | /* Find the shared object's text segment. */ | |
c5aa993b | 1181 | if (so->textsection) |
9e124216 EZ |
1182 | { |
1183 | lowest_addr = so->textsection->addr; | |
1184 | lowest_sect = bfd_get_section_by_name (so->abfd, ".text"); | |
1185 | lowest_index = lowest_sect->index; | |
1186 | } | |
c5aa993b | 1187 | else if (so->abfd != NULL) |
c906108c | 1188 | { |
9e124216 EZ |
1189 | /* If we didn't find a mapped non zero sized .text section, set |
1190 | up lowest_addr so that the relocation in symbol_file_add does | |
1191 | no harm. */ | |
c5aa993b | 1192 | lowest_sect = bfd_get_section_by_name (so->abfd, ".text"); |
c906108c | 1193 | if (lowest_sect == NULL) |
c5aa993b | 1194 | bfd_map_over_sections (so->abfd, find_lowest_section, |
96baa820 | 1195 | (PTR) &lowest_sect); |
c906108c | 1196 | if (lowest_sect) |
9e124216 EZ |
1197 | { |
1198 | lowest_addr = bfd_section_vma (so->abfd, lowest_sect) | |
1199 | + LM_ADDR (so); | |
1200 | lowest_index = lowest_sect->index; | |
1201 | } | |
c906108c | 1202 | } |
c5aa993b | 1203 | |
62557bbc KB |
1204 | sap = build_section_addr_info_from_section_table (so->sections, |
1205 | so->sections_end); | |
e7cf9df1 | 1206 | |
9e124216 EZ |
1207 | sap->other[lowest_index].addr = lowest_addr; |
1208 | ||
62557bbc KB |
1209 | so->objfile = symbol_file_add (so->so_name, so->from_tty, |
1210 | sap, 0, OBJF_SHARED); | |
1211 | free_section_addr_info (sap); | |
c906108c | 1212 | |
07cd4b97 | 1213 | return (1); |
c906108c SS |
1214 | } |
1215 | ||
c906108c | 1216 | |
07cd4b97 | 1217 | /* LOCAL FUNCTION |
c906108c | 1218 | |
105b175f | 1219 | update_solib_list --- synchronize GDB's shared object list with inferior's |
c906108c | 1220 | |
c5aa993b | 1221 | SYNOPSIS |
c906108c | 1222 | |
105b175f | 1223 | void update_solib_list (int from_tty, struct target_ops *TARGET) |
c906108c | 1224 | |
07cd4b97 | 1225 | Extract the list of currently loaded shared objects from the |
105b175f JB |
1226 | inferior, and compare it with the list of shared objects currently |
1227 | in GDB's so_list_head list. Edit so_list_head to bring it in sync | |
1228 | with the inferior's new list. | |
c906108c | 1229 | |
105b175f JB |
1230 | If we notice that the inferior has unloaded some shared objects, |
1231 | free any symbolic info GDB had read about those shared objects. | |
1232 | ||
1233 | Don't load symbolic info for any new shared objects; just add them | |
1234 | to the list, and leave their symbols_loaded flag clear. | |
07cd4b97 JB |
1235 | |
1236 | If FROM_TTY is non-null, feel free to print messages about what | |
1237 | we're doing. | |
c906108c | 1238 | |
07cd4b97 JB |
1239 | If TARGET is non-null, add the sections of all new shared objects |
1240 | to TARGET's section table. Note that this doesn't remove any | |
1241 | sections for shared objects that have been unloaded, and it | |
1242 | doesn't check to see if the new shared objects are already present in | |
1243 | the section table. But we only use this for core files and | |
1244 | processes we've just attached to, so that's okay. */ | |
c906108c | 1245 | |
07cd4b97 | 1246 | void |
105b175f | 1247 | update_solib_list (int from_tty, struct target_ops *target) |
07cd4b97 JB |
1248 | { |
1249 | struct so_list *inferior = current_sos (); | |
1250 | struct so_list *gdb, **gdb_link; | |
1251 | ||
104c1213 JM |
1252 | #ifdef SVR4_SHARED_LIBS |
1253 | /* If we are attaching to a running process for which we | |
1254 | have not opened a symbol file, we may be able to get its | |
1255 | symbols now! */ | |
1256 | if (attach_flag && | |
1257 | symfile_objfile == NULL) | |
9452d09b | 1258 | catch_errors (open_symbol_file_object, (PTR) &from_tty, |
104c1213 JM |
1259 | "Error reading attached process's symbol file.\n", |
1260 | RETURN_MASK_ALL); | |
1261 | ||
1262 | #endif SVR4_SHARED_LIBS | |
1263 | ||
07cd4b97 JB |
1264 | /* Since this function might actually add some elements to the |
1265 | so_list_head list, arrange for it to be cleaned up when | |
1266 | appropriate. */ | |
1267 | if (!solib_cleanup_queued) | |
1268 | { | |
1269 | make_run_cleanup (do_clear_solib, NULL); | |
1270 | solib_cleanup_queued = 1; | |
c906108c | 1271 | } |
c5aa993b | 1272 | |
07cd4b97 JB |
1273 | /* GDB and the inferior's dynamic linker each maintain their own |
1274 | list of currently loaded shared objects; we want to bring the | |
1275 | former in sync with the latter. Scan both lists, seeing which | |
1276 | shared objects appear where. There are three cases: | |
1277 | ||
1278 | - A shared object appears on both lists. This means that GDB | |
105b175f JB |
1279 | knows about it already, and it's still loaded in the inferior. |
1280 | Nothing needs to happen. | |
07cd4b97 JB |
1281 | |
1282 | - A shared object appears only on GDB's list. This means that | |
105b175f JB |
1283 | the inferior has unloaded it. We should remove the shared |
1284 | object from GDB's tables. | |
07cd4b97 JB |
1285 | |
1286 | - A shared object appears only on the inferior's list. This | |
105b175f JB |
1287 | means that it's just been loaded. We should add it to GDB's |
1288 | tables. | |
07cd4b97 JB |
1289 | |
1290 | So we walk GDB's list, checking each entry to see if it appears | |
1291 | in the inferior's list too. If it does, no action is needed, and | |
1292 | we remove it from the inferior's list. If it doesn't, the | |
1293 | inferior has unloaded it, and we remove it from GDB's list. By | |
1294 | the time we're done walking GDB's list, the inferior's list | |
1295 | contains only the new shared objects, which we then add. */ | |
1296 | ||
1297 | gdb = so_list_head; | |
1298 | gdb_link = &so_list_head; | |
1299 | while (gdb) | |
c906108c | 1300 | { |
07cd4b97 JB |
1301 | struct so_list *i = inferior; |
1302 | struct so_list **i_link = &inferior; | |
1303 | ||
1304 | /* Check to see whether the shared object *gdb also appears in | |
1305 | the inferior's current list. */ | |
1306 | while (i) | |
c906108c | 1307 | { |
07cd4b97 JB |
1308 | if (! strcmp (gdb->so_original_name, i->so_original_name)) |
1309 | break; | |
1310 | ||
1311 | i_link = &i->next; | |
1312 | i = *i_link; | |
c906108c | 1313 | } |
c5aa993b | 1314 | |
07cd4b97 JB |
1315 | /* If the shared object appears on the inferior's list too, then |
1316 | it's still loaded, so we don't need to do anything. Delete | |
1317 | it from the inferior's list, and leave it on GDB's list. */ | |
1318 | if (i) | |
c906108c | 1319 | { |
07cd4b97 | 1320 | *i_link = i->next; |
07cd4b97 JB |
1321 | free_so (i); |
1322 | gdb_link = &gdb->next; | |
1323 | gdb = *gdb_link; | |
1324 | } | |
1325 | ||
1326 | /* If it's not on the inferior's list, remove it from GDB's tables. */ | |
1327 | else | |
1328 | { | |
1329 | *gdb_link = gdb->next; | |
07cd4b97 JB |
1330 | |
1331 | /* Unless the user loaded it explicitly, free SO's objfile. */ | |
e8930304 | 1332 | if (gdb->objfile && ! (gdb->objfile->flags & OBJF_USERLOADED)) |
07cd4b97 JB |
1333 | free_objfile (gdb->objfile); |
1334 | ||
1335 | /* Some targets' section tables might be referring to | |
1336 | sections from so->abfd; remove them. */ | |
1337 | remove_target_sections (gdb->abfd); | |
1338 | ||
1339 | free_so (gdb); | |
1340 | gdb = *gdb_link; | |
c906108c SS |
1341 | } |
1342 | } | |
c5aa993b | 1343 | |
07cd4b97 JB |
1344 | /* Now the inferior's list contains only shared objects that don't |
1345 | appear in GDB's list --- those that are newly loaded. Add them | |
e8930304 | 1346 | to GDB's shared object list. */ |
07cd4b97 | 1347 | if (inferior) |
c906108c | 1348 | { |
07cd4b97 JB |
1349 | struct so_list *i; |
1350 | ||
1351 | /* Add the new shared objects to GDB's list. */ | |
1352 | *gdb_link = inferior; | |
1353 | ||
e8930304 | 1354 | /* Fill in the rest of each of the `struct so_list' nodes. */ |
07cd4b97 | 1355 | for (i = inferior; i; i = i->next) |
c906108c | 1356 | { |
07cd4b97 JB |
1357 | i->from_tty = from_tty; |
1358 | ||
1359 | /* Fill in the rest of the `struct so_list' node. */ | |
1360 | catch_errors (solib_map_sections, i, | |
1361 | "Error while mapping shared library sections:\n", | |
1362 | RETURN_MASK_ALL); | |
07cd4b97 JB |
1363 | } |
1364 | ||
1365 | /* If requested, add the shared objects' sections to the the | |
1366 | TARGET's section table. */ | |
1367 | if (target) | |
1368 | { | |
1369 | int new_sections; | |
1370 | ||
1371 | /* Figure out how many sections we'll need to add in total. */ | |
1372 | new_sections = 0; | |
1373 | for (i = inferior; i; i = i->next) | |
1374 | new_sections += (i->sections_end - i->sections); | |
1375 | ||
1376 | if (new_sections > 0) | |
c906108c | 1377 | { |
07cd4b97 JB |
1378 | int space = target_resize_to_sections (target, new_sections); |
1379 | ||
1380 | for (i = inferior; i; i = i->next) | |
1381 | { | |
1382 | int count = (i->sections_end - i->sections); | |
1383 | memcpy (target->to_sections + space, | |
1384 | i->sections, | |
1385 | count * sizeof (i->sections[0])); | |
1386 | space += count; | |
1387 | } | |
c906108c SS |
1388 | } |
1389 | } | |
e8930304 | 1390 | } |
105b175f JB |
1391 | } |
1392 | ||
1393 | ||
1394 | /* GLOBAL FUNCTION | |
1395 | ||
1396 | solib_add -- read in symbol info for newly added shared libraries | |
1397 | ||
1398 | SYNOPSIS | |
1399 | ||
1400 | void solib_add (char *pattern, int from_tty, struct target_ops *TARGET) | |
1401 | ||
1402 | DESCRIPTION | |
1403 | ||
1404 | Read in symbolic information for any shared objects whose names | |
1405 | match PATTERN. (If we've already read a shared object's symbol | |
1406 | info, leave it alone.) If PATTERN is zero, read them all. | |
1407 | ||
1408 | FROM_TTY and TARGET are as described for update_solib_list, above. */ | |
1409 | ||
1410 | void | |
1411 | solib_add (char *pattern, int from_tty, struct target_ops *target) | |
1412 | { | |
1413 | struct so_list *gdb; | |
1414 | ||
1415 | if (pattern) | |
1416 | { | |
1417 | char *re_err = re_comp (pattern); | |
1418 | ||
1419 | if (re_err) | |
1420 | error ("Invalid regexp: %s", re_err); | |
1421 | } | |
1422 | ||
1423 | update_solib_list (from_tty, target); | |
c906108c | 1424 | |
105b175f JB |
1425 | /* Walk the list of currently loaded shared libraries, and read |
1426 | symbols for any that match the pattern --- or any whose symbols | |
1427 | aren't already loaded, if no pattern was given. */ | |
e8930304 JB |
1428 | { |
1429 | int any_matches = 0; | |
1430 | int loaded_any_symbols = 0; | |
c906108c | 1431 | |
e8930304 JB |
1432 | for (gdb = so_list_head; gdb; gdb = gdb->next) |
1433 | if (! pattern || re_exec (gdb->so_name)) | |
1434 | { | |
1435 | any_matches = 1; | |
1436 | ||
1437 | if (gdb->symbols_loaded) | |
1438 | { | |
1439 | if (from_tty) | |
1440 | printf_unfiltered ("Symbols already loaded for %s\n", | |
1441 | gdb->so_name); | |
1442 | } | |
1443 | else | |
1444 | { | |
1445 | if (catch_errors | |
1446 | (symbol_add_stub, gdb, | |
1447 | "Error while reading shared library symbols:\n", | |
1448 | RETURN_MASK_ALL)) | |
1449 | { | |
1450 | if (from_tty) | |
1451 | printf_unfiltered ("Loaded symbols for %s\n", | |
1452 | gdb->so_name); | |
1453 | gdb->symbols_loaded = 1; | |
1454 | loaded_any_symbols = 1; | |
1455 | } | |
1456 | } | |
1457 | } | |
1458 | ||
1459 | if (from_tty && pattern && ! any_matches) | |
1460 | printf_unfiltered | |
1461 | ("No loaded shared libraries match the pattern `%s'.\n", pattern); | |
1462 | ||
1463 | if (loaded_any_symbols) | |
1464 | { | |
1465 | /* Getting new symbols may change our opinion about what is | |
1466 | frameless. */ | |
1467 | reinit_frame_cache (); | |
1468 | ||
1469 | special_symbol_handling (); | |
1470 | } | |
1471 | } | |
c906108c SS |
1472 | } |
1473 | ||
07cd4b97 | 1474 | |
c906108c SS |
1475 | /* |
1476 | ||
c5aa993b | 1477 | LOCAL FUNCTION |
c906108c | 1478 | |
c5aa993b | 1479 | info_sharedlibrary_command -- code for "info sharedlibrary" |
c906108c | 1480 | |
c5aa993b | 1481 | SYNOPSIS |
c906108c | 1482 | |
c5aa993b | 1483 | static void info_sharedlibrary_command () |
c906108c | 1484 | |
c5aa993b | 1485 | DESCRIPTION |
c906108c | 1486 | |
c5aa993b JM |
1487 | Walk through the shared library list and print information |
1488 | about each attached library. | |
1489 | */ | |
c906108c SS |
1490 | |
1491 | static void | |
1492 | info_sharedlibrary_command (ignore, from_tty) | |
1493 | char *ignore; | |
1494 | int from_tty; | |
1495 | { | |
c5aa993b | 1496 | register struct so_list *so = NULL; /* link map state variable */ |
c906108c SS |
1497 | int header_done = 0; |
1498 | int addr_width; | |
1499 | char *addr_fmt; | |
f5b8946c | 1500 | int arch_size; |
c906108c SS |
1501 | |
1502 | if (exec_bfd == NULL) | |
1503 | { | |
4ce44c66 | 1504 | printf_unfiltered ("No executable file.\n"); |
c906108c SS |
1505 | return; |
1506 | } | |
1507 | ||
f5b8946c MS |
1508 | arch_size = bfd_elf_get_arch_size (exec_bfd); |
1509 | /* Default to 32-bit in case of failure (non-elf). */ | |
1510 | if (arch_size == 32 || arch_size == -1) | |
1511 | { | |
1512 | addr_width = 8 + 4; | |
1513 | addr_fmt = "08l"; | |
1514 | } | |
1515 | else if (arch_size == 64) | |
1516 | { | |
1517 | addr_width = 16 + 4; | |
1518 | addr_fmt = "016l"; | |
1519 | } | |
c906108c | 1520 | |
105b175f | 1521 | update_solib_list (from_tty, 0); |
07cd4b97 JB |
1522 | |
1523 | for (so = so_list_head; so; so = so->next) | |
c906108c | 1524 | { |
c5aa993b | 1525 | if (so->so_name[0]) |
c906108c SS |
1526 | { |
1527 | if (!header_done) | |
1528 | { | |
c5aa993b JM |
1529 | printf_unfiltered ("%-*s%-*s%-12s%s\n", addr_width, "From", |
1530 | addr_width, "To", "Syms Read", | |
1531 | "Shared Object Library"); | |
c906108c SS |
1532 | header_done++; |
1533 | } | |
1534 | ||
1535 | printf_unfiltered ("%-*s", addr_width, | |
c5aa993b JM |
1536 | local_hex_string_custom ((unsigned long) LM_ADDR (so), |
1537 | addr_fmt)); | |
c906108c | 1538 | printf_unfiltered ("%-*s", addr_width, |
c5aa993b JM |
1539 | local_hex_string_custom ((unsigned long) so->lmend, |
1540 | addr_fmt)); | |
1541 | printf_unfiltered ("%-12s", so->symbols_loaded ? "Yes" : "No"); | |
1542 | printf_unfiltered ("%s\n", so->so_name); | |
c906108c SS |
1543 | } |
1544 | } | |
1545 | if (so_list_head == NULL) | |
1546 | { | |
c5aa993b | 1547 | printf_unfiltered ("No shared libraries loaded at this time.\n"); |
c906108c SS |
1548 | } |
1549 | } | |
1550 | ||
1551 | /* | |
1552 | ||
c5aa993b | 1553 | GLOBAL FUNCTION |
c906108c | 1554 | |
c5aa993b | 1555 | solib_address -- check to see if an address is in a shared lib |
c906108c | 1556 | |
c5aa993b | 1557 | SYNOPSIS |
c906108c | 1558 | |
c5aa993b | 1559 | char * solib_address (CORE_ADDR address) |
c906108c | 1560 | |
c5aa993b | 1561 | DESCRIPTION |
c906108c | 1562 | |
c5aa993b JM |
1563 | Provides a hook for other gdb routines to discover whether or |
1564 | not a particular address is within the mapped address space of | |
1565 | a shared library. Any address between the base mapping address | |
1566 | and the first address beyond the end of the last mapping, is | |
1567 | considered to be within the shared library address space, for | |
1568 | our purposes. | |
c906108c | 1569 | |
c5aa993b JM |
1570 | For example, this routine is called at one point to disable |
1571 | breakpoints which are in shared libraries that are not currently | |
1572 | mapped in. | |
c906108c SS |
1573 | */ |
1574 | ||
1575 | char * | |
1576 | solib_address (address) | |
1577 | CORE_ADDR address; | |
1578 | { | |
c5aa993b JM |
1579 | register struct so_list *so = 0; /* link map state variable */ |
1580 | ||
07cd4b97 | 1581 | for (so = so_list_head; so; so = so->next) |
c906108c | 1582 | { |
07cd4b97 JB |
1583 | if (LM_ADDR (so) <= address && address < so->lmend) |
1584 | return (so->so_name); | |
c906108c | 1585 | } |
07cd4b97 | 1586 | |
c906108c SS |
1587 | return (0); |
1588 | } | |
1589 | ||
1590 | /* Called by free_all_symtabs */ | |
1591 | ||
c5aa993b | 1592 | void |
085dd6e6 | 1593 | clear_solib () |
c906108c | 1594 | { |
085dd6e6 JM |
1595 | /* This function is expected to handle ELF shared libraries. It is |
1596 | also used on Solaris, which can run either ELF or a.out binaries | |
1597 | (for compatibility with SunOS 4), both of which can use shared | |
1598 | libraries. So we don't know whether we have an ELF executable or | |
1599 | an a.out executable until the user chooses an executable file. | |
1600 | ||
1601 | ELF shared libraries don't get mapped into the address space | |
1602 | until after the program starts, so we'd better not try to insert | |
1603 | breakpoints in them immediately. We have to wait until the | |
1604 | dynamic linker has loaded them; we'll hit a bp_shlib_event | |
1605 | breakpoint (look for calls to create_solib_event_breakpoint) when | |
1606 | it's ready. | |
1607 | ||
1608 | SunOS shared libraries seem to be different --- they're present | |
1609 | as soon as the process begins execution, so there's no need to | |
1610 | put off inserting breakpoints. There's also nowhere to put a | |
1611 | bp_shlib_event breakpoint, so if we put it off, we'll never get | |
1612 | around to it. | |
1613 | ||
1614 | So: disable breakpoints only if we're using ELF shared libs. */ | |
1615 | if (exec_bfd != NULL | |
1616 | && bfd_get_flavour (exec_bfd) != bfd_target_aout_flavour) | |
1617 | disable_breakpoints_in_shlibs (1); | |
1618 | ||
c906108c SS |
1619 | while (so_list_head) |
1620 | { | |
07cd4b97 JB |
1621 | struct so_list *so = so_list_head; |
1622 | so_list_head = so->next; | |
1623 | free_so (so); | |
c906108c | 1624 | } |
07cd4b97 | 1625 | |
c906108c SS |
1626 | debug_base = 0; |
1627 | } | |
1628 | ||
1629 | static void | |
1630 | do_clear_solib (dummy) | |
1631 | PTR dummy; | |
1632 | { | |
1633 | solib_cleanup_queued = 0; | |
1634 | clear_solib (); | |
1635 | } | |
1636 | ||
1637 | #ifdef SVR4_SHARED_LIBS | |
1638 | ||
1639 | /* Return 1 if PC lies in the dynamic symbol resolution code of the | |
1640 | SVR4 run time loader. */ | |
1641 | ||
1642 | static CORE_ADDR interp_text_sect_low; | |
1643 | static CORE_ADDR interp_text_sect_high; | |
1644 | static CORE_ADDR interp_plt_sect_low; | |
1645 | static CORE_ADDR interp_plt_sect_high; | |
1646 | ||
1647 | int | |
1648 | in_svr4_dynsym_resolve_code (pc) | |
1649 | CORE_ADDR pc; | |
1650 | { | |
1651 | return ((pc >= interp_text_sect_low && pc < interp_text_sect_high) | |
1652 | || (pc >= interp_plt_sect_low && pc < interp_plt_sect_high) | |
1653 | || in_plt_section (pc, NULL)); | |
1654 | } | |
1655 | #endif | |
1656 | ||
1657 | /* | |
1658 | ||
c5aa993b | 1659 | LOCAL FUNCTION |
c906108c | 1660 | |
c5aa993b | 1661 | disable_break -- remove the "mapping changed" breakpoint |
c906108c | 1662 | |
c5aa993b | 1663 | SYNOPSIS |
c906108c | 1664 | |
c5aa993b | 1665 | static int disable_break () |
c906108c | 1666 | |
c5aa993b | 1667 | DESCRIPTION |
c906108c | 1668 | |
c5aa993b JM |
1669 | Removes the breakpoint that gets hit when the dynamic linker |
1670 | completes a mapping change. | |
c906108c | 1671 | |
c5aa993b | 1672 | */ |
c906108c SS |
1673 | |
1674 | #ifndef SVR4_SHARED_LIBS | |
1675 | ||
1676 | static int | |
1677 | disable_break () | |
1678 | { | |
1679 | int status = 1; | |
1680 | ||
1681 | #ifndef SVR4_SHARED_LIBS | |
1682 | ||
1683 | int in_debugger = 0; | |
c5aa993b | 1684 | |
c906108c SS |
1685 | /* Read the debugger structure from the inferior to retrieve the |
1686 | address of the breakpoint and the original contents of the | |
1687 | breakpoint address. Remove the breakpoint by writing the original | |
1688 | contents back. */ | |
1689 | ||
1690 | read_memory (debug_addr, (char *) &debug_copy, sizeof (debug_copy)); | |
1691 | ||
1692 | /* Set `in_debugger' to zero now. */ | |
1693 | ||
1694 | write_memory (flag_addr, (char *) &in_debugger, sizeof (in_debugger)); | |
1695 | ||
07cd4b97 | 1696 | breakpoint_addr = SOLIB_EXTRACT_ADDRESS (debug_copy.ldd_bp_addr); |
c906108c SS |
1697 | write_memory (breakpoint_addr, (char *) &debug_copy.ldd_bp_inst, |
1698 | sizeof (debug_copy.ldd_bp_inst)); | |
1699 | ||
c5aa993b | 1700 | #else /* SVR4_SHARED_LIBS */ |
c906108c SS |
1701 | |
1702 | /* Note that breakpoint address and original contents are in our address | |
1703 | space, so we just need to write the original contents back. */ | |
1704 | ||
1705 | if (memory_remove_breakpoint (breakpoint_addr, shadow_contents) != 0) | |
1706 | { | |
1707 | status = 0; | |
1708 | } | |
1709 | ||
c5aa993b | 1710 | #endif /* !SVR4_SHARED_LIBS */ |
c906108c SS |
1711 | |
1712 | /* For the SVR4 version, we always know the breakpoint address. For the | |
1713 | SunOS version we don't know it until the above code is executed. | |
1714 | Grumble if we are stopped anywhere besides the breakpoint address. */ | |
1715 | ||
1716 | if (stop_pc != breakpoint_addr) | |
1717 | { | |
1718 | warning ("stopped at unknown breakpoint while handling shared libraries"); | |
1719 | } | |
1720 | ||
1721 | return (status); | |
1722 | } | |
1723 | ||
c5aa993b | 1724 | #endif /* #ifdef SVR4_SHARED_LIBS */ |
c906108c SS |
1725 | |
1726 | /* | |
1727 | ||
c5aa993b JM |
1728 | LOCAL FUNCTION |
1729 | ||
1730 | enable_break -- arrange for dynamic linker to hit breakpoint | |
1731 | ||
1732 | SYNOPSIS | |
1733 | ||
1734 | int enable_break (void) | |
1735 | ||
1736 | DESCRIPTION | |
1737 | ||
1738 | Both the SunOS and the SVR4 dynamic linkers have, as part of their | |
1739 | debugger interface, support for arranging for the inferior to hit | |
1740 | a breakpoint after mapping in the shared libraries. This function | |
1741 | enables that breakpoint. | |
1742 | ||
1743 | For SunOS, there is a special flag location (in_debugger) which we | |
1744 | set to 1. When the dynamic linker sees this flag set, it will set | |
1745 | a breakpoint at a location known only to itself, after saving the | |
1746 | original contents of that place and the breakpoint address itself, | |
1747 | in it's own internal structures. When we resume the inferior, it | |
1748 | will eventually take a SIGTRAP when it runs into the breakpoint. | |
1749 | We handle this (in a different place) by restoring the contents of | |
1750 | the breakpointed location (which is only known after it stops), | |
1751 | chasing around to locate the shared libraries that have been | |
1752 | loaded, then resuming. | |
1753 | ||
1754 | For SVR4, the debugger interface structure contains a member (r_brk) | |
1755 | which is statically initialized at the time the shared library is | |
1756 | built, to the offset of a function (_r_debug_state) which is guaran- | |
1757 | teed to be called once before mapping in a library, and again when | |
1758 | the mapping is complete. At the time we are examining this member, | |
1759 | it contains only the unrelocated offset of the function, so we have | |
1760 | to do our own relocation. Later, when the dynamic linker actually | |
1761 | runs, it relocates r_brk to be the actual address of _r_debug_state(). | |
1762 | ||
1763 | The debugger interface structure also contains an enumeration which | |
1764 | is set to either RT_ADD or RT_DELETE prior to changing the mapping, | |
1765 | depending upon whether or not the library is being mapped or unmapped, | |
1766 | and then set to RT_CONSISTENT after the library is mapped/unmapped. | |
1767 | */ | |
c906108c SS |
1768 | |
1769 | static int | |
1770 | enable_break () | |
1771 | { | |
1772 | int success = 0; | |
1773 | ||
1774 | #ifndef SVR4_SHARED_LIBS | |
1775 | ||
1776 | int j; | |
1777 | int in_debugger; | |
1778 | ||
1779 | /* Get link_dynamic structure */ | |
1780 | ||
1781 | j = target_read_memory (debug_base, (char *) &dynamic_copy, | |
1782 | sizeof (dynamic_copy)); | |
1783 | if (j) | |
1784 | { | |
1785 | /* unreadable */ | |
1786 | return (0); | |
1787 | } | |
1788 | ||
1789 | /* Calc address of debugger interface structure */ | |
1790 | ||
07cd4b97 | 1791 | debug_addr = SOLIB_EXTRACT_ADDRESS (dynamic_copy.ldd); |
c906108c SS |
1792 | |
1793 | /* Calc address of `in_debugger' member of debugger interface structure */ | |
1794 | ||
1795 | flag_addr = debug_addr + (CORE_ADDR) ((char *) &debug_copy.ldd_in_debugger - | |
1796 | (char *) &debug_copy); | |
1797 | ||
1798 | /* Write a value of 1 to this member. */ | |
1799 | ||
1800 | in_debugger = 1; | |
1801 | write_memory (flag_addr, (char *) &in_debugger, sizeof (in_debugger)); | |
1802 | success = 1; | |
1803 | ||
c5aa993b | 1804 | #else /* SVR4_SHARED_LIBS */ |
c906108c SS |
1805 | |
1806 | #ifdef BKPT_AT_SYMBOL | |
1807 | ||
1808 | struct minimal_symbol *msymbol; | |
1809 | char **bkpt_namep; | |
1810 | asection *interp_sect; | |
1811 | ||
1812 | /* First, remove all the solib event breakpoints. Their addresses | |
1813 | may have changed since the last time we ran the program. */ | |
1814 | remove_solib_event_breakpoints (); | |
1815 | ||
1816 | #ifdef SVR4_SHARED_LIBS | |
1817 | interp_text_sect_low = interp_text_sect_high = 0; | |
1818 | interp_plt_sect_low = interp_plt_sect_high = 0; | |
1819 | ||
1820 | /* Find the .interp section; if not found, warn the user and drop | |
1821 | into the old breakpoint at symbol code. */ | |
1822 | interp_sect = bfd_get_section_by_name (exec_bfd, ".interp"); | |
1823 | if (interp_sect) | |
1824 | { | |
1825 | unsigned int interp_sect_size; | |
1826 | char *buf; | |
1827 | CORE_ADDR load_addr; | |
1828 | bfd *tmp_bfd; | |
1829 | CORE_ADDR sym_addr = 0; | |
1830 | ||
1831 | /* Read the contents of the .interp section into a local buffer; | |
c5aa993b | 1832 | the contents specify the dynamic linker this program uses. */ |
c906108c SS |
1833 | interp_sect_size = bfd_section_size (exec_bfd, interp_sect); |
1834 | buf = alloca (interp_sect_size); | |
1835 | bfd_get_section_contents (exec_bfd, interp_sect, | |
1836 | buf, 0, interp_sect_size); | |
1837 | ||
1838 | /* Now we need to figure out where the dynamic linker was | |
c5aa993b JM |
1839 | loaded so that we can load its symbols and place a breakpoint |
1840 | in the dynamic linker itself. | |
c906108c | 1841 | |
c5aa993b JM |
1842 | This address is stored on the stack. However, I've been unable |
1843 | to find any magic formula to find it for Solaris (appears to | |
1844 | be trivial on GNU/Linux). Therefore, we have to try an alternate | |
1845 | mechanism to find the dynamic linker's base address. */ | |
c906108c SS |
1846 | tmp_bfd = bfd_openr (buf, gnutarget); |
1847 | if (tmp_bfd == NULL) | |
1848 | goto bkpt_at_symbol; | |
1849 | ||
1850 | /* Make sure the dynamic linker's really a useful object. */ | |
1851 | if (!bfd_check_format (tmp_bfd, bfd_object)) | |
1852 | { | |
1853 | warning ("Unable to grok dynamic linker %s as an object file", buf); | |
1854 | bfd_close (tmp_bfd); | |
1855 | goto bkpt_at_symbol; | |
1856 | } | |
1857 | ||
1858 | /* We find the dynamic linker's base address by examining the | |
c5aa993b JM |
1859 | current pc (which point at the entry point for the dynamic |
1860 | linker) and subtracting the offset of the entry point. */ | |
c906108c SS |
1861 | load_addr = read_pc () - tmp_bfd->start_address; |
1862 | ||
1863 | /* Record the relocated start and end address of the dynamic linker | |
c5aa993b | 1864 | text and plt section for in_svr4_dynsym_resolve_code. */ |
c906108c SS |
1865 | interp_sect = bfd_get_section_by_name (tmp_bfd, ".text"); |
1866 | if (interp_sect) | |
1867 | { | |
1868 | interp_text_sect_low = | |
1869 | bfd_section_vma (tmp_bfd, interp_sect) + load_addr; | |
1870 | interp_text_sect_high = | |
1871 | interp_text_sect_low + bfd_section_size (tmp_bfd, interp_sect); | |
1872 | } | |
1873 | interp_sect = bfd_get_section_by_name (tmp_bfd, ".plt"); | |
1874 | if (interp_sect) | |
1875 | { | |
1876 | interp_plt_sect_low = | |
1877 | bfd_section_vma (tmp_bfd, interp_sect) + load_addr; | |
1878 | interp_plt_sect_high = | |
1879 | interp_plt_sect_low + bfd_section_size (tmp_bfd, interp_sect); | |
1880 | } | |
1881 | ||
1882 | /* Now try to set a breakpoint in the dynamic linker. */ | |
1883 | for (bkpt_namep = solib_break_names; *bkpt_namep != NULL; bkpt_namep++) | |
1884 | { | |
1885 | sym_addr = bfd_lookup_symbol (tmp_bfd, *bkpt_namep); | |
1886 | if (sym_addr != 0) | |
1887 | break; | |
1888 | } | |
1889 | ||
1890 | /* We're done with the temporary bfd. */ | |
1891 | bfd_close (tmp_bfd); | |
1892 | ||
1893 | if (sym_addr != 0) | |
1894 | { | |
1895 | create_solib_event_breakpoint (load_addr + sym_addr); | |
1896 | return 1; | |
1897 | } | |
1898 | ||
1899 | /* For whatever reason we couldn't set a breakpoint in the dynamic | |
c5aa993b JM |
1900 | linker. Warn and drop into the old code. */ |
1901 | bkpt_at_symbol: | |
c906108c SS |
1902 | warning ("Unable to find dynamic linker breakpoint function.\nGDB will be unable to debug shared library initializers\nand track explicitly loaded dynamic code."); |
1903 | } | |
1904 | #endif | |
1905 | ||
1906 | /* Scan through the list of symbols, trying to look up the symbol and | |
1907 | set a breakpoint there. Terminate loop when we/if we succeed. */ | |
1908 | ||
1909 | breakpoint_addr = 0; | |
1910 | for (bkpt_namep = bkpt_names; *bkpt_namep != NULL; bkpt_namep++) | |
1911 | { | |
1912 | msymbol = lookup_minimal_symbol (*bkpt_namep, NULL, symfile_objfile); | |
1913 | if ((msymbol != NULL) && (SYMBOL_VALUE_ADDRESS (msymbol) != 0)) | |
1914 | { | |
1915 | create_solib_event_breakpoint (SYMBOL_VALUE_ADDRESS (msymbol)); | |
1916 | return 1; | |
1917 | } | |
1918 | } | |
1919 | ||
1920 | /* Nothing good happened. */ | |
1921 | success = 0; | |
1922 | ||
c5aa993b | 1923 | #endif /* BKPT_AT_SYMBOL */ |
c906108c | 1924 | |
c5aa993b | 1925 | #endif /* !SVR4_SHARED_LIBS */ |
c906108c SS |
1926 | |
1927 | return (success); | |
1928 | } | |
c5aa993b | 1929 | |
c906108c | 1930 | /* |
c5aa993b JM |
1931 | |
1932 | GLOBAL FUNCTION | |
1933 | ||
1934 | solib_create_inferior_hook -- shared library startup support | |
1935 | ||
1936 | SYNOPSIS | |
1937 | ||
1938 | void solib_create_inferior_hook() | |
1939 | ||
1940 | DESCRIPTION | |
1941 | ||
1942 | When gdb starts up the inferior, it nurses it along (through the | |
1943 | shell) until it is ready to execute it's first instruction. At this | |
1944 | point, this function gets called via expansion of the macro | |
1945 | SOLIB_CREATE_INFERIOR_HOOK. | |
1946 | ||
1947 | For SunOS executables, this first instruction is typically the | |
1948 | one at "_start", or a similar text label, regardless of whether | |
1949 | the executable is statically or dynamically linked. The runtime | |
1950 | startup code takes care of dynamically linking in any shared | |
1951 | libraries, once gdb allows the inferior to continue. | |
1952 | ||
1953 | For SVR4 executables, this first instruction is either the first | |
1954 | instruction in the dynamic linker (for dynamically linked | |
1955 | executables) or the instruction at "start" for statically linked | |
1956 | executables. For dynamically linked executables, the system | |
1957 | first exec's /lib/libc.so.N, which contains the dynamic linker, | |
1958 | and starts it running. The dynamic linker maps in any needed | |
1959 | shared libraries, maps in the actual user executable, and then | |
1960 | jumps to "start" in the user executable. | |
1961 | ||
1962 | For both SunOS shared libraries, and SVR4 shared libraries, we | |
1963 | can arrange to cooperate with the dynamic linker to discover the | |
1964 | names of shared libraries that are dynamically linked, and the | |
1965 | base addresses to which they are linked. | |
1966 | ||
1967 | This function is responsible for discovering those names and | |
1968 | addresses, and saving sufficient information about them to allow | |
1969 | their symbols to be read at a later time. | |
1970 | ||
1971 | FIXME | |
1972 | ||
1973 | Between enable_break() and disable_break(), this code does not | |
1974 | properly handle hitting breakpoints which the user might have | |
1975 | set in the startup code or in the dynamic linker itself. Proper | |
1976 | handling will probably have to wait until the implementation is | |
1977 | changed to use the "breakpoint handler function" method. | |
1978 | ||
1979 | Also, what if child has exit()ed? Must exit loop somehow. | |
1980 | */ | |
1981 | ||
1982 | void | |
1983 | solib_create_inferior_hook () | |
c906108c SS |
1984 | { |
1985 | /* If we are using the BKPT_AT_SYMBOL code, then we don't need the base | |
1986 | yet. In fact, in the case of a SunOS4 executable being run on | |
07cd4b97 | 1987 | Solaris, we can't get it yet. current_sos will get it when it needs |
c906108c SS |
1988 | it. */ |
1989 | #if !(defined (SVR4_SHARED_LIBS) && defined (BKPT_AT_SYMBOL)) | |
1990 | if ((debug_base = locate_base ()) == 0) | |
1991 | { | |
1992 | /* Can't find the symbol or the executable is statically linked. */ | |
1993 | return; | |
1994 | } | |
1995 | #endif | |
1996 | ||
1997 | if (!enable_break ()) | |
1998 | { | |
1999 | warning ("shared library handler failed to enable breakpoint"); | |
2000 | return; | |
2001 | } | |
2002 | ||
2003 | #if !defined(SVR4_SHARED_LIBS) || defined(_SCO_DS) | |
2004 | /* SCO and SunOS need the loop below, other systems should be using the | |
2005 | special shared library breakpoints and the shared library breakpoint | |
2006 | service routine. | |
2007 | ||
2008 | Now run the target. It will eventually hit the breakpoint, at | |
2009 | which point all of the libraries will have been mapped in and we | |
2010 | can go groveling around in the dynamic linker structures to find | |
2011 | out what we need to know about them. */ | |
2012 | ||
2013 | clear_proceed_status (); | |
2014 | stop_soon_quietly = 1; | |
2015 | stop_signal = TARGET_SIGNAL_0; | |
2016 | do | |
2017 | { | |
2018 | target_resume (-1, 0, stop_signal); | |
2019 | wait_for_inferior (); | |
2020 | } | |
2021 | while (stop_signal != TARGET_SIGNAL_TRAP); | |
2022 | stop_soon_quietly = 0; | |
2023 | ||
2024 | #if !defined(_SCO_DS) | |
2025 | /* We are now either at the "mapping complete" breakpoint (or somewhere | |
2026 | else, a condition we aren't prepared to deal with anyway), so adjust | |
2027 | the PC as necessary after a breakpoint, disable the breakpoint, and | |
2028 | add any shared libraries that were mapped in. */ | |
2029 | ||
2030 | if (DECR_PC_AFTER_BREAK) | |
2031 | { | |
2032 | stop_pc -= DECR_PC_AFTER_BREAK; | |
2033 | write_register (PC_REGNUM, stop_pc); | |
2034 | } | |
2035 | ||
2036 | if (!disable_break ()) | |
2037 | { | |
2038 | warning ("shared library handler failed to disable breakpoint"); | |
2039 | } | |
2040 | ||
2041 | if (auto_solib_add) | |
2042 | solib_add ((char *) 0, 0, (struct target_ops *) 0); | |
2043 | #endif /* ! _SCO_DS */ | |
2044 | #endif | |
2045 | } | |
2046 | ||
2047 | /* | |
2048 | ||
c5aa993b | 2049 | LOCAL FUNCTION |
c906108c | 2050 | |
c5aa993b | 2051 | special_symbol_handling -- additional shared library symbol handling |
c906108c | 2052 | |
c5aa993b | 2053 | SYNOPSIS |
c906108c | 2054 | |
07cd4b97 | 2055 | void special_symbol_handling () |
c906108c | 2056 | |
c5aa993b | 2057 | DESCRIPTION |
c906108c | 2058 | |
c5aa993b JM |
2059 | Once the symbols from a shared object have been loaded in the usual |
2060 | way, we are called to do any system specific symbol handling that | |
2061 | is needed. | |
c906108c | 2062 | |
c5aa993b JM |
2063 | For SunOS4, this consists of grunging around in the dynamic |
2064 | linkers structures to find symbol definitions for "common" symbols | |
2065 | and adding them to the minimal symbol table for the runtime common | |
2066 | objfile. | |
c906108c | 2067 | |
c5aa993b | 2068 | */ |
c906108c SS |
2069 | |
2070 | static void | |
07cd4b97 | 2071 | special_symbol_handling () |
c906108c SS |
2072 | { |
2073 | #ifndef SVR4_SHARED_LIBS | |
2074 | int j; | |
2075 | ||
2076 | if (debug_addr == 0) | |
2077 | { | |
2078 | /* Get link_dynamic structure */ | |
2079 | ||
2080 | j = target_read_memory (debug_base, (char *) &dynamic_copy, | |
2081 | sizeof (dynamic_copy)); | |
2082 | if (j) | |
2083 | { | |
2084 | /* unreadable */ | |
2085 | return; | |
2086 | } | |
2087 | ||
2088 | /* Calc address of debugger interface structure */ | |
2089 | /* FIXME, this needs work for cross-debugging of core files | |
c5aa993b | 2090 | (byteorder, size, alignment, etc). */ |
c906108c | 2091 | |
07cd4b97 | 2092 | debug_addr = SOLIB_EXTRACT_ADDRESS (dynamic_copy.ldd); |
c906108c SS |
2093 | } |
2094 | ||
2095 | /* Read the debugger structure from the inferior, just to make sure | |
2096 | we have a current copy. */ | |
2097 | ||
2098 | j = target_read_memory (debug_addr, (char *) &debug_copy, | |
2099 | sizeof (debug_copy)); | |
2100 | if (j) | |
c5aa993b | 2101 | return; /* unreadable */ |
c906108c SS |
2102 | |
2103 | /* Get common symbol definitions for the loaded object. */ | |
2104 | ||
2105 | if (debug_copy.ldd_cp) | |
2106 | { | |
07cd4b97 | 2107 | solib_add_common_symbols (SOLIB_EXTRACT_ADDRESS (debug_copy.ldd_cp)); |
c906108c SS |
2108 | } |
2109 | ||
c5aa993b | 2110 | #endif /* !SVR4_SHARED_LIBS */ |
c906108c SS |
2111 | } |
2112 | ||
2113 | ||
2114 | /* | |
2115 | ||
c5aa993b | 2116 | LOCAL FUNCTION |
c906108c | 2117 | |
c5aa993b | 2118 | sharedlibrary_command -- handle command to explicitly add library |
c906108c | 2119 | |
c5aa993b | 2120 | SYNOPSIS |
c906108c | 2121 | |
c5aa993b | 2122 | static void sharedlibrary_command (char *args, int from_tty) |
c906108c | 2123 | |
c5aa993b | 2124 | DESCRIPTION |
c906108c | 2125 | |
c5aa993b | 2126 | */ |
c906108c SS |
2127 | |
2128 | static void | |
2129 | sharedlibrary_command (args, from_tty) | |
c5aa993b JM |
2130 | char *args; |
2131 | int from_tty; | |
c906108c SS |
2132 | { |
2133 | dont_repeat (); | |
2134 | solib_add (args, from_tty, (struct target_ops *) 0); | |
2135 | } | |
2136 | ||
2137 | #endif /* HAVE_LINK_H */ | |
2138 | ||
2139 | void | |
c5aa993b | 2140 | _initialize_solib () |
c906108c SS |
2141 | { |
2142 | #ifdef HAVE_LINK_H | |
2143 | ||
2144 | add_com ("sharedlibrary", class_files, sharedlibrary_command, | |
2145 | "Load shared object library symbols for files matching REGEXP."); | |
c5aa993b | 2146 | add_info ("sharedlibrary", info_sharedlibrary_command, |
c906108c SS |
2147 | "Status of loaded shared object libraries."); |
2148 | ||
2149 | add_show_from_set | |
2150 | (add_set_cmd ("auto-solib-add", class_support, var_zinteger, | |
2151 | (char *) &auto_solib_add, | |
2152 | "Set autoloading of shared library symbols.\n\ | |
2153 | If nonzero, symbols from all shared object libraries will be loaded\n\ | |
2154 | automatically when the inferior begins execution or when the dynamic linker\n\ | |
2155 | informs gdb that a new library has been loaded. Otherwise, symbols\n\ | |
2156 | must be loaded manually, using `sharedlibrary'.", | |
2157 | &setlist), | |
2158 | &showlist); | |
2159 | ||
2160 | add_show_from_set | |
2161 | (add_set_cmd ("solib-absolute-prefix", class_support, var_filename, | |
2162 | (char *) &solib_absolute_prefix, | |
2163 | "Set prefix for loading absolute shared library symbol files.\n\ | |
2164 | For other (relative) files, you can add values using `set solib-search-path'.", | |
2165 | &setlist), | |
2166 | &showlist); | |
2167 | add_show_from_set | |
2168 | (add_set_cmd ("solib-search-path", class_support, var_string, | |
2169 | (char *) &solib_search_path, | |
2170 | "Set the search path for loading non-absolute shared library symbol files.\n\ | |
2171 | This takes precedence over the environment variables PATH and LD_LIBRARY_PATH.", | |
2172 | &setlist), | |
2173 | &showlist); | |
2174 | ||
2175 | #endif /* HAVE_LINK_H */ | |
2176 | } |