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c906108c | 1 | /* Handle SunOS and SVR4 shared libraries for GDB, the GNU Debugger. |
8554b7d5 | 2 | Copyright 1990, 91, 92, 93, 94, 95, 96, 98, 1999, 2000 |
c906108c | 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 | 21 | |
23e04971 | 22 | #define _SYSCALL32 /* for Sparc64 cross Sparc32 */ |
c906108c SS |
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 | ||
23e04971 | 110 | /* Function to extract an address from a solib structure. |
07cd4b97 JB |
111 | When GDB is configured for some 32-bit targets (e.g. Solaris 2.7 |
112 | sparc), BFD is configured to handle 64-bit targets, so CORE_ADDR is | |
113 | 64 bits. We have to extract only the significant bits of addresses | |
23e04971 | 114 | to get the right address when accessing the core file BFD. |
07cd4b97 | 115 | |
23e04971 MS |
116 | We'll use the BFD itself to determine the number of significant bits. |
117 | MVS, June 2000 */ | |
118 | ||
119 | static CORE_ADDR | |
120 | solib_extract_address (void *memberp) | |
121 | { | |
122 | return extract_address (memberp, | |
359431fb | 123 | bfd_get_arch_size (exec_bfd) / 8); |
23e04971 MS |
124 | } |
125 | ||
126 | #define SOLIB_EXTRACT_ADDRESS(MEMBER) \ | |
127 | solib_extract_address (&MEMBER) | |
128 | ||
129 | /* local data declarations */ | |
07cd4b97 | 130 | |
c906108c SS |
131 | #ifndef SVR4_SHARED_LIBS |
132 | ||
23e04971 MS |
133 | /* NOTE: converted the macros LM_ADDR, LM_NEXT, LM_NAME and |
134 | IGNORE_FIRST_LINK_MAP_ENTRY into functions (see below). | |
135 | MVS, June 2000 */ | |
136 | ||
c906108c SS |
137 | static struct link_dynamic dynamic_copy; |
138 | static struct link_dynamic_2 ld_2_copy; | |
139 | static struct ld_debug debug_copy; | |
140 | static CORE_ADDR debug_addr; | |
141 | static CORE_ADDR flag_addr; | |
142 | ||
c5aa993b | 143 | #else /* SVR4_SHARED_LIBS */ |
c906108c | 144 | |
c906108c | 145 | static struct r_debug debug_copy; |
23e04971 MS |
146 | #if defined (HAVE_STRUCT_LINK_MAP32) |
147 | static struct r_debug32 debug32_copy; /* Sparc64 cross Sparc32 */ | |
148 | #endif | |
149 | ||
c906108c SS |
150 | char shadow_contents[BREAKPOINT_MAX]; /* Stash old bkpt addr contents */ |
151 | ||
c5aa993b JM |
152 | #endif /* !SVR4_SHARED_LIBS */ |
153 | ||
154 | struct so_list | |
155 | { | |
07cd4b97 JB |
156 | /* The following fields of the structure come directly from the |
157 | dynamic linker's tables in the inferior, and are initialized by | |
158 | current_sos. */ | |
159 | ||
c5aa993b JM |
160 | struct so_list *next; /* next structure in linked list */ |
161 | struct link_map lm; /* copy of link map from inferior */ | |
23e04971 MS |
162 | #if defined (HAVE_STRUCT_LINK_MAP32) |
163 | struct link_map32 lm32; /* copy of link map from 32-bit inferior */ | |
164 | #endif | |
07cd4b97 JB |
165 | CORE_ADDR lmaddr; /* addr in inferior lm was read from */ |
166 | ||
167 | /* Shared object file name, exactly as it appears in the | |
168 | inferior's link map. This may be a relative path, or something | |
169 | which needs to be looked up in LD_LIBRARY_PATH, etc. We use it | |
170 | to tell which entries in the inferior's dynamic linker's link | |
171 | map we've already loaded. */ | |
172 | char so_original_name[MAX_PATH_SIZE]; | |
173 | ||
174 | /* shared object file name, expanded to something GDB can open */ | |
175 | char so_name[MAX_PATH_SIZE]; | |
176 | ||
177 | /* The following fields of the structure are built from | |
178 | information gathered from the shared object file itself, and | |
179 | are initialized when we actually add it to our symbol tables. */ | |
180 | ||
181 | bfd *abfd; | |
c5aa993b | 182 | CORE_ADDR lmend; /* upper addr bound of mapped object */ |
c5aa993b JM |
183 | char symbols_loaded; /* flag: symbols read in yet? */ |
184 | char from_tty; /* flag: print msgs? */ | |
185 | struct objfile *objfile; /* objfile for loaded lib */ | |
186 | struct section_table *sections; | |
187 | struct section_table *sections_end; | |
188 | struct section_table *textsection; | |
c5aa993b | 189 | }; |
c906108c SS |
190 | |
191 | static struct so_list *so_list_head; /* List of known shared objects */ | |
23e04971 MS |
192 | |
193 | /* link map access functions */ | |
194 | ||
195 | #ifndef SVR4_SHARED_LIBS | |
196 | ||
197 | static CORE_ADDR | |
7ff09628 | 198 | LM_ADDR (struct so_list *so) |
23e04971 MS |
199 | { |
200 | #if defined (HAVE_STRUCT_LINK_MAP32) | |
359431fb | 201 | if (bfd_get_arch_size (exec_bfd) == 32) |
23e04971 MS |
202 | return extract_address (&so->lm32.lm_addr, sizeof (so->lm32.lm_addr)); |
203 | else | |
204 | #endif | |
205 | return extract_address (&so->lm.lm_addr, sizeof (so->lm.lm_addr)); | |
206 | } | |
207 | ||
208 | static CORE_ADDR | |
7ff09628 | 209 | LM_NEXT (struct so_list *so) |
23e04971 MS |
210 | { |
211 | #if defined (HAVE_STRUCT_LINK_MAP32) | |
359431fb | 212 | if (bfd_get_arch_size (exec_bfd) == 32) |
23e04971 MS |
213 | return extract_address (&so->lm32.lm_next, sizeof (so->lm32.lm_next)); |
214 | else | |
215 | #endif | |
216 | return extract_address (&so->lm.lm_next, sizeof (so->lm.lm_next)); | |
217 | } | |
218 | ||
219 | static CORE_ADDR | |
7ff09628 | 220 | LM_NAME (struct so_list *so) |
23e04971 MS |
221 | { |
222 | #if defined (HAVE_STRUCT_LINK_MAP32) | |
359431fb | 223 | if (bfd_get_arch_size (exec_bfd) == 32) |
23e04971 MS |
224 | return extract_address (&so->lm32.lm_name, sizeof (so->lm32.lm_name)); |
225 | else | |
226 | #endif | |
227 | return extract_address (&so->lm.lm_name, sizeof (so->lm.lm_name)); | |
228 | } | |
229 | ||
230 | static int | |
7ff09628 | 231 | IGNORE_FIRST_LINK_MAP_ENTRY (struct so_list *so) |
23e04971 MS |
232 | { |
233 | return 0; | |
234 | } | |
235 | ||
236 | #else /* SVR4_SHARED_LIBS */ | |
237 | ||
238 | static CORE_ADDR | |
7ff09628 | 239 | LM_ADDR (struct so_list *so) |
23e04971 MS |
240 | { |
241 | #if defined (HAVE_STRUCT_LINK_MAP32) | |
359431fb | 242 | if (bfd_get_arch_size (exec_bfd) == 32) |
23e04971 MS |
243 | return extract_address (&so->lm32.l_addr, sizeof (so->lm32.l_addr)); |
244 | else | |
245 | #endif | |
246 | return extract_address (&so->lm.l_addr, sizeof (so->lm.l_addr)); | |
247 | } | |
248 | ||
249 | static CORE_ADDR | |
7ff09628 | 250 | LM_NEXT (struct so_list *so) |
23e04971 MS |
251 | { |
252 | #if defined (HAVE_STRUCT_LINK_MAP32) | |
359431fb | 253 | if (bfd_get_arch_size (exec_bfd) == 32) |
23e04971 MS |
254 | return extract_address (&so->lm32.l_next, sizeof (so->lm32.l_next)); |
255 | else | |
256 | #endif | |
257 | return extract_address (&so->lm.l_next, sizeof (so->lm.l_next)); | |
258 | } | |
259 | ||
260 | static CORE_ADDR | |
7ff09628 | 261 | LM_NAME (struct so_list *so) |
23e04971 MS |
262 | { |
263 | #if defined (HAVE_STRUCT_LINK_MAP32) | |
359431fb | 264 | if (bfd_get_arch_size (exec_bfd) == 32) |
23e04971 MS |
265 | return extract_address (&so->lm32.l_name, sizeof (so->lm32.l_name)); |
266 | else | |
267 | #endif | |
268 | return extract_address (&so->lm.l_name, sizeof (so->lm.l_name)); | |
269 | } | |
270 | ||
271 | static int | |
7ff09628 | 272 | IGNORE_FIRST_LINK_MAP_ENTRY (struct so_list *so) |
23e04971 MS |
273 | { |
274 | #if defined (HAVE_STRUCT_LINK_MAP32) | |
359431fb | 275 | if (bfd_get_arch_size (exec_bfd) == 32) |
23e04971 MS |
276 | return (solib_extract_address (&(so) -> lm32.l_prev) == 0); |
277 | else | |
278 | #endif | |
279 | return (solib_extract_address (&(so) -> lm.l_prev) == 0); | |
280 | } | |
281 | ||
282 | #endif /* !SVR4_SHARED_LIBS */ | |
283 | ||
284 | ||
c5aa993b | 285 | static CORE_ADDR debug_base; /* Base of dynamic linker structures */ |
c906108c SS |
286 | static CORE_ADDR breakpoint_addr; /* Address where end bkpt is set */ |
287 | ||
c5aa993b | 288 | static int solib_cleanup_queued = 0; /* make_run_cleanup called */ |
c906108c | 289 | |
a14ed312 | 290 | extern int fdmatch (int, int); /* In libiberty */ |
c906108c SS |
291 | |
292 | /* Local function prototypes */ | |
293 | ||
a14ed312 | 294 | static void do_clear_solib (PTR); |
c906108c | 295 | |
a14ed312 | 296 | static int match_main (char *); |
c906108c | 297 | |
a14ed312 | 298 | static void special_symbol_handling (void); |
c906108c | 299 | |
a14ed312 | 300 | static void sharedlibrary_command (char *, int); |
c906108c | 301 | |
a14ed312 | 302 | static int enable_break (void); |
c906108c | 303 | |
a14ed312 | 304 | static void info_sharedlibrary_command (char *, int); |
c906108c | 305 | |
a14ed312 | 306 | static int symbol_add_stub (PTR); |
c906108c | 307 | |
a14ed312 | 308 | static CORE_ADDR first_link_map_member (void); |
c906108c | 309 | |
a14ed312 | 310 | static CORE_ADDR locate_base (void); |
c906108c | 311 | |
a14ed312 | 312 | static int solib_map_sections (PTR); |
c906108c SS |
313 | |
314 | #ifdef SVR4_SHARED_LIBS | |
315 | ||
a14ed312 | 316 | static CORE_ADDR elf_locate_base (void); |
c906108c SS |
317 | |
318 | #else | |
319 | ||
07cd4b97 JB |
320 | static struct so_list *current_sos (void); |
321 | static void free_so (struct so_list *node); | |
322 | ||
a14ed312 | 323 | static int disable_break (void); |
c906108c | 324 | |
a14ed312 | 325 | static void allocate_rt_common_objfile (void); |
c906108c SS |
326 | |
327 | static void | |
07cd4b97 | 328 | solib_add_common_symbols (CORE_ADDR); |
c906108c SS |
329 | |
330 | #endif | |
331 | ||
a14ed312 | 332 | void _initialize_solib (void); |
c906108c SS |
333 | |
334 | /* If non-zero, this is a prefix that will be added to the front of the name | |
335 | shared libraries with an absolute filename for loading. */ | |
336 | static char *solib_absolute_prefix = NULL; | |
337 | ||
338 | /* If non-empty, this is a search path for loading non-absolute shared library | |
339 | symbol files. This takes precedence over the environment variables PATH | |
340 | and LD_LIBRARY_PATH. */ | |
341 | static char *solib_search_path = NULL; | |
342 | ||
343 | /* | |
344 | ||
c5aa993b | 345 | LOCAL FUNCTION |
c906108c | 346 | |
c5aa993b | 347 | solib_map_sections -- open bfd and build sections for shared lib |
c906108c | 348 | |
c5aa993b | 349 | SYNOPSIS |
c906108c | 350 | |
c5aa993b | 351 | static int solib_map_sections (struct so_list *so) |
c906108c | 352 | |
c5aa993b | 353 | DESCRIPTION |
c906108c | 354 | |
c5aa993b JM |
355 | Given a pointer to one of the shared objects in our list |
356 | of mapped objects, use the recorded name to open a bfd | |
357 | descriptor for the object, build a section table, and then | |
358 | relocate all the section addresses by the base address at | |
359 | which the shared object was mapped. | |
c906108c | 360 | |
c5aa993b | 361 | FIXMES |
c906108c | 362 | |
c5aa993b JM |
363 | In most (all?) cases the shared object file name recorded in the |
364 | dynamic linkage tables will be a fully qualified pathname. For | |
365 | cases where it isn't, do we really mimic the systems search | |
366 | mechanism correctly in the below code (particularly the tilde | |
367 | expansion stuff?). | |
c906108c SS |
368 | */ |
369 | ||
370 | static int | |
fba45db2 | 371 | solib_map_sections (PTR arg) |
c906108c SS |
372 | { |
373 | struct so_list *so = (struct so_list *) arg; /* catch_errors bogon */ | |
374 | char *filename; | |
375 | char *scratch_pathname; | |
376 | int scratch_chan; | |
377 | struct section_table *p; | |
378 | struct cleanup *old_chain; | |
379 | bfd *abfd; | |
c5aa993b JM |
380 | |
381 | filename = tilde_expand (so->so_name); | |
382 | ||
c906108c SS |
383 | if (solib_absolute_prefix && ROOTED_P (filename)) |
384 | /* Prefix shared libraries with absolute filenames with | |
385 | SOLIB_ABSOLUTE_PREFIX. */ | |
386 | { | |
387 | char *pfxed_fn; | |
388 | int pfx_len; | |
389 | ||
390 | pfx_len = strlen (solib_absolute_prefix); | |
391 | ||
392 | /* Remove trailing slashes. */ | |
393 | while (pfx_len > 0 && SLASH_P (solib_absolute_prefix[pfx_len - 1])) | |
394 | pfx_len--; | |
395 | ||
396 | pfxed_fn = xmalloc (pfx_len + strlen (filename) + 1); | |
397 | strcpy (pfxed_fn, solib_absolute_prefix); | |
398 | strcat (pfxed_fn, filename); | |
399 | free (filename); | |
400 | ||
401 | filename = pfxed_fn; | |
402 | } | |
403 | ||
404 | old_chain = make_cleanup (free, filename); | |
405 | ||
406 | scratch_chan = -1; | |
407 | ||
408 | if (solib_search_path) | |
409 | scratch_chan = openp (solib_search_path, | |
410 | 1, filename, O_RDONLY, 0, &scratch_pathname); | |
411 | if (scratch_chan < 0) | |
c5aa993b | 412 | scratch_chan = openp (get_in_environ (inferior_environ, "PATH"), |
c906108c SS |
413 | 1, filename, O_RDONLY, 0, &scratch_pathname); |
414 | if (scratch_chan < 0) | |
415 | { | |
c5aa993b JM |
416 | scratch_chan = openp (get_in_environ |
417 | (inferior_environ, "LD_LIBRARY_PATH"), | |
c906108c SS |
418 | 1, filename, O_RDONLY, 0, &scratch_pathname); |
419 | } | |
420 | if (scratch_chan < 0) | |
421 | { | |
422 | perror_with_name (filename); | |
423 | } | |
424 | /* Leave scratch_pathname allocated. abfd->name will point to it. */ | |
425 | ||
426 | abfd = bfd_fdopenr (scratch_pathname, gnutarget, scratch_chan); | |
427 | if (!abfd) | |
428 | { | |
429 | close (scratch_chan); | |
430 | error ("Could not open `%s' as an executable file: %s", | |
431 | scratch_pathname, bfd_errmsg (bfd_get_error ())); | |
432 | } | |
433 | /* Leave bfd open, core_xfer_memory and "info files" need it. */ | |
c5aa993b JM |
434 | so->abfd = abfd; |
435 | abfd->cacheable = true; | |
c906108c SS |
436 | |
437 | /* copy full path name into so_name, so that later symbol_file_add can find | |
438 | it */ | |
439 | if (strlen (scratch_pathname) >= MAX_PATH_SIZE) | |
440 | error ("Full path name length of shared library exceeds MAX_PATH_SIZE in so_list structure."); | |
441 | strcpy (so->so_name, scratch_pathname); | |
442 | ||
443 | if (!bfd_check_format (abfd, bfd_object)) | |
444 | { | |
445 | error ("\"%s\": not in executable format: %s.", | |
446 | scratch_pathname, bfd_errmsg (bfd_get_error ())); | |
447 | } | |
c5aa993b | 448 | if (build_section_table (abfd, &so->sections, &so->sections_end)) |
c906108c | 449 | { |
c5aa993b | 450 | error ("Can't find the file sections in `%s': %s", |
c906108c SS |
451 | bfd_get_filename (abfd), bfd_errmsg (bfd_get_error ())); |
452 | } | |
453 | ||
c5aa993b | 454 | for (p = so->sections; p < so->sections_end; p++) |
c906108c SS |
455 | { |
456 | /* Relocate the section binding addresses as recorded in the shared | |
c5aa993b JM |
457 | object's file by the base address to which the object was actually |
458 | mapped. */ | |
07cd4b97 JB |
459 | p->addr += LM_ADDR (so); |
460 | p->endaddr += LM_ADDR (so); | |
461 | so->lmend = max (p->endaddr, so->lmend); | |
c5aa993b | 462 | if (STREQ (p->the_bfd_section->name, ".text")) |
c906108c | 463 | { |
c5aa993b | 464 | so->textsection = p; |
c906108c SS |
465 | } |
466 | } | |
467 | ||
468 | /* Free the file names, close the file now. */ | |
469 | do_cleanups (old_chain); | |
470 | ||
471 | return (1); | |
472 | } | |
473 | ||
474 | #ifndef SVR4_SHARED_LIBS | |
475 | ||
476 | /* Allocate the runtime common object file. */ | |
477 | ||
478 | static void | |
fba45db2 | 479 | allocate_rt_common_objfile (void) |
c906108c SS |
480 | { |
481 | struct objfile *objfile; | |
482 | struct objfile *last_one; | |
483 | ||
484 | objfile = (struct objfile *) xmalloc (sizeof (struct objfile)); | |
485 | memset (objfile, 0, sizeof (struct objfile)); | |
c5aa993b JM |
486 | objfile->md = NULL; |
487 | obstack_specify_allocation (&objfile->psymbol_cache.cache, 0, 0, | |
c906108c | 488 | xmalloc, free); |
c5aa993b | 489 | obstack_specify_allocation (&objfile->psymbol_obstack, 0, 0, xmalloc, |
c906108c | 490 | free); |
c5aa993b | 491 | obstack_specify_allocation (&objfile->symbol_obstack, 0, 0, xmalloc, |
c906108c | 492 | free); |
c5aa993b | 493 | obstack_specify_allocation (&objfile->type_obstack, 0, 0, xmalloc, |
c906108c | 494 | free); |
c5aa993b | 495 | objfile->name = mstrsave (objfile->md, "rt_common"); |
c906108c SS |
496 | |
497 | /* Add this file onto the tail of the linked list of other such files. */ | |
498 | ||
c5aa993b | 499 | objfile->next = NULL; |
c906108c SS |
500 | if (object_files == NULL) |
501 | object_files = objfile; | |
502 | else | |
503 | { | |
504 | for (last_one = object_files; | |
c5aa993b JM |
505 | last_one->next; |
506 | last_one = last_one->next); | |
507 | last_one->next = objfile; | |
c906108c SS |
508 | } |
509 | ||
510 | rt_common_objfile = objfile; | |
511 | } | |
512 | ||
513 | /* Read all dynamically loaded common symbol definitions from the inferior | |
514 | and put them into the minimal symbol table for the runtime common | |
515 | objfile. */ | |
516 | ||
517 | static void | |
fba45db2 | 518 | solib_add_common_symbols (CORE_ADDR rtc_symp) |
c906108c SS |
519 | { |
520 | struct rtc_symb inferior_rtc_symb; | |
521 | struct nlist inferior_rtc_nlist; | |
522 | int len; | |
523 | char *name; | |
524 | ||
525 | /* Remove any runtime common symbols from previous runs. */ | |
526 | ||
c5aa993b | 527 | if (rt_common_objfile != NULL && rt_common_objfile->minimal_symbol_count) |
c906108c | 528 | { |
c5aa993b JM |
529 | obstack_free (&rt_common_objfile->symbol_obstack, 0); |
530 | obstack_specify_allocation (&rt_common_objfile->symbol_obstack, 0, 0, | |
c906108c | 531 | xmalloc, free); |
c5aa993b JM |
532 | rt_common_objfile->minimal_symbol_count = 0; |
533 | rt_common_objfile->msymbols = NULL; | |
c906108c SS |
534 | } |
535 | ||
536 | init_minimal_symbol_collection (); | |
56e290f4 | 537 | make_cleanup_discard_minimal_symbols (); |
c906108c SS |
538 | |
539 | while (rtc_symp) | |
540 | { | |
07cd4b97 | 541 | read_memory (rtc_symp, |
c906108c SS |
542 | (char *) &inferior_rtc_symb, |
543 | sizeof (inferior_rtc_symb)); | |
07cd4b97 | 544 | read_memory (SOLIB_EXTRACT_ADDRESS (inferior_rtc_symb.rtc_sp), |
c906108c | 545 | (char *) &inferior_rtc_nlist, |
c5aa993b | 546 | sizeof (inferior_rtc_nlist)); |
c906108c SS |
547 | if (inferior_rtc_nlist.n_type == N_COMM) |
548 | { | |
549 | /* FIXME: The length of the symbol name is not available, but in the | |
550 | current implementation the common symbol is allocated immediately | |
551 | behind the name of the symbol. */ | |
552 | len = inferior_rtc_nlist.n_value - inferior_rtc_nlist.n_un.n_strx; | |
553 | ||
554 | name = xmalloc (len); | |
07cd4b97 JB |
555 | read_memory (SOLIB_EXTRACT_ADDRESS (inferior_rtc_nlist.n_un.n_name), |
556 | name, len); | |
c906108c SS |
557 | |
558 | /* Allocate the runtime common objfile if necessary. */ | |
559 | if (rt_common_objfile == NULL) | |
560 | allocate_rt_common_objfile (); | |
561 | ||
562 | prim_record_minimal_symbol (name, inferior_rtc_nlist.n_value, | |
563 | mst_bss, rt_common_objfile); | |
564 | free (name); | |
565 | } | |
07cd4b97 | 566 | rtc_symp = SOLIB_EXTRACT_ADDRESS (inferior_rtc_symb.rtc_next); |
c906108c SS |
567 | } |
568 | ||
569 | /* Install any minimal symbols that have been collected as the current | |
570 | minimal symbols for the runtime common objfile. */ | |
571 | ||
572 | install_minimal_symbols (rt_common_objfile); | |
573 | } | |
574 | ||
c5aa993b | 575 | #endif /* SVR4_SHARED_LIBS */ |
c906108c SS |
576 | |
577 | ||
578 | #ifdef SVR4_SHARED_LIBS | |
579 | ||
a14ed312 | 580 | static CORE_ADDR bfd_lookup_symbol (bfd *, char *); |
c906108c SS |
581 | |
582 | /* | |
583 | ||
c5aa993b | 584 | LOCAL FUNCTION |
c906108c | 585 | |
c5aa993b | 586 | bfd_lookup_symbol -- lookup the value for a specific symbol |
c906108c | 587 | |
c5aa993b | 588 | SYNOPSIS |
c906108c | 589 | |
c5aa993b | 590 | CORE_ADDR bfd_lookup_symbol (bfd *abfd, char *symname) |
c906108c | 591 | |
c5aa993b | 592 | DESCRIPTION |
c906108c | 593 | |
c5aa993b JM |
594 | An expensive way to lookup the value of a single symbol for |
595 | bfd's that are only temporary anyway. This is used by the | |
596 | shared library support to find the address of the debugger | |
597 | interface structures in the shared library. | |
c906108c | 598 | |
c5aa993b JM |
599 | Note that 0 is specifically allowed as an error return (no |
600 | such symbol). | |
601 | */ | |
c906108c SS |
602 | |
603 | static CORE_ADDR | |
fba45db2 | 604 | bfd_lookup_symbol (bfd *abfd, char *symname) |
c906108c SS |
605 | { |
606 | unsigned int storage_needed; | |
607 | asymbol *sym; | |
608 | asymbol **symbol_table; | |
609 | unsigned int number_of_symbols; | |
610 | unsigned int i; | |
611 | struct cleanup *back_to; | |
612 | CORE_ADDR symaddr = 0; | |
c5aa993b | 613 | |
c906108c SS |
614 | storage_needed = bfd_get_symtab_upper_bound (abfd); |
615 | ||
616 | if (storage_needed > 0) | |
617 | { | |
618 | symbol_table = (asymbol **) xmalloc (storage_needed); | |
c5aa993b JM |
619 | back_to = make_cleanup (free, (PTR) symbol_table); |
620 | number_of_symbols = bfd_canonicalize_symtab (abfd, symbol_table); | |
621 | ||
c906108c SS |
622 | for (i = 0; i < number_of_symbols; i++) |
623 | { | |
624 | sym = *symbol_table++; | |
c5aa993b | 625 | if (STREQ (sym->name, symname)) |
c906108c SS |
626 | { |
627 | /* Bfd symbols are section relative. */ | |
c5aa993b | 628 | symaddr = sym->value + sym->section->vma; |
c906108c SS |
629 | break; |
630 | } | |
631 | } | |
632 | do_cleanups (back_to); | |
633 | } | |
8554b7d5 MK |
634 | |
635 | if (symaddr) | |
636 | return symaddr; | |
637 | ||
638 | /* On FreeBSD, the dynamic linker is stripped by default. So we'll | |
639 | have to check the dynamic string table too. */ | |
640 | ||
641 | storage_needed = bfd_get_dynamic_symtab_upper_bound (abfd); | |
642 | ||
643 | if (storage_needed > 0) | |
644 | { | |
645 | symbol_table = (asymbol **) xmalloc (storage_needed); | |
646 | back_to = make_cleanup (free, (PTR) symbol_table); | |
647 | number_of_symbols = bfd_canonicalize_dynamic_symtab (abfd, symbol_table); | |
648 | ||
649 | for (i = 0; i < number_of_symbols; i++) | |
650 | { | |
651 | sym = *symbol_table++; | |
652 | if (STREQ (sym->name, symname)) | |
653 | { | |
654 | /* Bfd symbols are section relative. */ | |
655 | symaddr = sym->value + sym->section->vma; | |
656 | break; | |
657 | } | |
658 | } | |
659 | do_cleanups (back_to); | |
660 | } | |
661 | ||
662 | return symaddr; | |
c906108c SS |
663 | } |
664 | ||
665 | #ifdef HANDLE_SVR4_EXEC_EMULATORS | |
666 | ||
667 | /* | |
c5aa993b JM |
668 | Solaris BCP (the part of Solaris which allows it to run SunOS4 |
669 | a.out files) throws in another wrinkle. Solaris does not fill | |
670 | in the usual a.out link map structures when running BCP programs, | |
671 | the only way to get at them is via groping around in the dynamic | |
672 | linker. | |
673 | The dynamic linker and it's structures are located in the shared | |
674 | C library, which gets run as the executable's "interpreter" by | |
675 | the kernel. | |
676 | ||
677 | Note that we can assume nothing about the process state at the time | |
678 | we need to find these structures. We may be stopped on the first | |
679 | instruction of the interpreter (C shared library), the first | |
680 | instruction of the executable itself, or somewhere else entirely | |
681 | (if we attached to the process for example). | |
682 | */ | |
683 | ||
684 | static char *debug_base_symbols[] = | |
685 | { | |
686 | "r_debug", /* Solaris 2.3 */ | |
687 | "_r_debug", /* Solaris 2.1, 2.2 */ | |
c906108c SS |
688 | NULL |
689 | }; | |
690 | ||
a14ed312 | 691 | static int look_for_base (int, CORE_ADDR); |
c906108c SS |
692 | |
693 | /* | |
694 | ||
c5aa993b | 695 | LOCAL FUNCTION |
c906108c | 696 | |
c5aa993b | 697 | look_for_base -- examine file for each mapped address segment |
c906108c | 698 | |
c5aa993b | 699 | SYNOPSYS |
c906108c | 700 | |
c5aa993b | 701 | static int look_for_base (int fd, CORE_ADDR baseaddr) |
c906108c | 702 | |
c5aa993b | 703 | DESCRIPTION |
c906108c | 704 | |
c5aa993b JM |
705 | This function is passed to proc_iterate_over_mappings, which |
706 | causes it to get called once for each mapped address space, with | |
707 | an open file descriptor for the file mapped to that space, and the | |
708 | base address of that mapped space. | |
c906108c | 709 | |
c5aa993b JM |
710 | Our job is to find the debug base symbol in the file that this |
711 | fd is open on, if it exists, and if so, initialize the dynamic | |
712 | linker structure base address debug_base. | |
c906108c | 713 | |
c5aa993b JM |
714 | Note that this is a computationally expensive proposition, since |
715 | we basically have to open a bfd on every call, so we specifically | |
716 | avoid opening the exec file. | |
c906108c SS |
717 | */ |
718 | ||
719 | static int | |
fba45db2 | 720 | look_for_base (int fd, CORE_ADDR baseaddr) |
c906108c SS |
721 | { |
722 | bfd *interp_bfd; | |
723 | CORE_ADDR address = 0; | |
724 | char **symbolp; | |
725 | ||
726 | /* If the fd is -1, then there is no file that corresponds to this | |
727 | mapped memory segment, so skip it. Also, if the fd corresponds | |
728 | to the exec file, skip it as well. */ | |
729 | ||
730 | if (fd == -1 | |
731 | || (exec_bfd != NULL | |
c5aa993b | 732 | && fdmatch (fileno ((FILE *) (exec_bfd->iostream)), fd))) |
c906108c SS |
733 | { |
734 | return (0); | |
735 | } | |
736 | ||
737 | /* Try to open whatever random file this fd corresponds to. Note that | |
738 | we have no way currently to find the filename. Don't gripe about | |
739 | any problems we might have, just fail. */ | |
740 | ||
741 | if ((interp_bfd = bfd_fdopenr ("unnamed", gnutarget, fd)) == NULL) | |
742 | { | |
743 | return (0); | |
744 | } | |
745 | if (!bfd_check_format (interp_bfd, bfd_object)) | |
746 | { | |
747 | /* FIXME-leak: on failure, might not free all memory associated with | |
c5aa993b | 748 | interp_bfd. */ |
c906108c SS |
749 | bfd_close (interp_bfd); |
750 | return (0); | |
751 | } | |
752 | ||
753 | /* Now try to find our debug base symbol in this file, which we at | |
754 | least know to be a valid ELF executable or shared library. */ | |
755 | ||
756 | for (symbolp = debug_base_symbols; *symbolp != NULL; symbolp++) | |
757 | { | |
758 | address = bfd_lookup_symbol (interp_bfd, *symbolp); | |
759 | if (address != 0) | |
760 | { | |
761 | break; | |
762 | } | |
763 | } | |
764 | if (address == 0) | |
765 | { | |
766 | /* FIXME-leak: on failure, might not free all memory associated with | |
c5aa993b | 767 | interp_bfd. */ |
c906108c SS |
768 | bfd_close (interp_bfd); |
769 | return (0); | |
770 | } | |
771 | ||
772 | /* Eureka! We found the symbol. But now we may need to relocate it | |
773 | by the base address. If the symbol's value is less than the base | |
774 | address of the shared library, then it hasn't yet been relocated | |
775 | by the dynamic linker, and we have to do it ourself. FIXME: Note | |
776 | that we make the assumption that the first segment that corresponds | |
777 | to the shared library has the base address to which the library | |
778 | was relocated. */ | |
779 | ||
780 | if (address < baseaddr) | |
781 | { | |
782 | address += baseaddr; | |
783 | } | |
784 | debug_base = address; | |
785 | /* FIXME-leak: on failure, might not free all memory associated with | |
786 | interp_bfd. */ | |
787 | bfd_close (interp_bfd); | |
788 | return (1); | |
789 | } | |
790 | #endif /* HANDLE_SVR4_EXEC_EMULATORS */ | |
791 | ||
792 | /* | |
793 | ||
c5aa993b | 794 | LOCAL FUNCTION |
c906108c | 795 | |
c5aa993b JM |
796 | elf_locate_base -- locate the base address of dynamic linker structs |
797 | for SVR4 elf targets. | |
c906108c | 798 | |
c5aa993b | 799 | SYNOPSIS |
c906108c | 800 | |
c5aa993b | 801 | CORE_ADDR elf_locate_base (void) |
c906108c | 802 | |
c5aa993b | 803 | DESCRIPTION |
c906108c | 804 | |
c5aa993b JM |
805 | For SVR4 elf targets the address of the dynamic linker's runtime |
806 | structure is contained within the dynamic info section in the | |
807 | executable file. The dynamic section is also mapped into the | |
808 | inferior address space. Because the runtime loader fills in the | |
809 | real address before starting the inferior, we have to read in the | |
810 | dynamic info section from the inferior address space. | |
811 | If there are any errors while trying to find the address, we | |
812 | silently return 0, otherwise the found address is returned. | |
c906108c SS |
813 | |
814 | */ | |
815 | ||
816 | static CORE_ADDR | |
fba45db2 | 817 | elf_locate_base (void) |
c906108c SS |
818 | { |
819 | sec_ptr dyninfo_sect; | |
820 | int dyninfo_sect_size; | |
821 | CORE_ADDR dyninfo_addr; | |
822 | char *buf; | |
823 | char *bufend; | |
f5b8946c | 824 | int arch_size; |
c906108c SS |
825 | |
826 | /* Find the start address of the .dynamic section. */ | |
827 | dyninfo_sect = bfd_get_section_by_name (exec_bfd, ".dynamic"); | |
828 | if (dyninfo_sect == NULL) | |
829 | return 0; | |
830 | dyninfo_addr = bfd_section_vma (exec_bfd, dyninfo_sect); | |
831 | ||
832 | /* Read in .dynamic section, silently ignore errors. */ | |
833 | dyninfo_sect_size = bfd_section_size (exec_bfd, dyninfo_sect); | |
834 | buf = alloca (dyninfo_sect_size); | |
835 | if (target_read_memory (dyninfo_addr, buf, dyninfo_sect_size)) | |
836 | return 0; | |
837 | ||
838 | /* Find the DT_DEBUG entry in the the .dynamic section. | |
839 | For mips elf we look for DT_MIPS_RLD_MAP, mips elf apparently has | |
840 | no DT_DEBUG entries. */ | |
f5b8946c | 841 | |
6ceadee4 | 842 | arch_size = bfd_get_arch_size (exec_bfd); |
f5b8946c MS |
843 | if (arch_size == -1) /* failure */ |
844 | return 0; | |
845 | ||
846 | if (arch_size == 32) | |
847 | { /* 32-bit elf */ | |
848 | for (bufend = buf + dyninfo_sect_size; | |
849 | buf < bufend; | |
850 | buf += sizeof (Elf32_External_Dyn)) | |
c906108c | 851 | { |
f5b8946c MS |
852 | Elf32_External_Dyn *x_dynp = (Elf32_External_Dyn *) buf; |
853 | long dyn_tag; | |
854 | CORE_ADDR dyn_ptr; | |
855 | ||
856 | dyn_tag = bfd_h_get_32 (exec_bfd, (bfd_byte *) x_dynp->d_tag); | |
857 | if (dyn_tag == DT_NULL) | |
858 | break; | |
859 | else if (dyn_tag == DT_DEBUG) | |
860 | { | |
861 | dyn_ptr = bfd_h_get_32 (exec_bfd, | |
862 | (bfd_byte *) x_dynp->d_un.d_ptr); | |
863 | return dyn_ptr; | |
864 | } | |
c906108c | 865 | #ifdef DT_MIPS_RLD_MAP |
f5b8946c MS |
866 | else if (dyn_tag == DT_MIPS_RLD_MAP) |
867 | { | |
35fc8285 | 868 | char *pbuf; |
f5b8946c | 869 | |
35fc8285 | 870 | pbuf = alloca (TARGET_PTR_BIT / HOST_CHAR_BIT); |
f5b8946c MS |
871 | /* DT_MIPS_RLD_MAP contains a pointer to the address |
872 | of the dynamic link structure. */ | |
873 | dyn_ptr = bfd_h_get_32 (exec_bfd, | |
874 | (bfd_byte *) x_dynp->d_un.d_ptr); | |
875 | if (target_read_memory (dyn_ptr, pbuf, sizeof (pbuf))) | |
876 | return 0; | |
877 | return extract_unsigned_integer (pbuf, sizeof (pbuf)); | |
878 | } | |
c906108c | 879 | #endif |
f5b8946c | 880 | } |
c906108c | 881 | } |
f5b8946c | 882 | else /* 64-bit elf */ |
c906108c | 883 | { |
f5b8946c MS |
884 | for (bufend = buf + dyninfo_sect_size; |
885 | buf < bufend; | |
886 | buf += sizeof (Elf64_External_Dyn)) | |
c906108c | 887 | { |
f5b8946c MS |
888 | Elf64_External_Dyn *x_dynp = (Elf64_External_Dyn *) buf; |
889 | long dyn_tag; | |
890 | CORE_ADDR dyn_ptr; | |
891 | ||
892 | dyn_tag = bfd_h_get_64 (exec_bfd, (bfd_byte *) x_dynp->d_tag); | |
893 | if (dyn_tag == DT_NULL) | |
894 | break; | |
895 | else if (dyn_tag == DT_DEBUG) | |
896 | { | |
897 | dyn_ptr = bfd_h_get_64 (exec_bfd, | |
898 | (bfd_byte *) x_dynp->d_un.d_ptr); | |
899 | return dyn_ptr; | |
900 | } | |
c906108c SS |
901 | } |
902 | } | |
c906108c SS |
903 | |
904 | /* DT_DEBUG entry not found. */ | |
905 | return 0; | |
906 | } | |
907 | ||
c5aa993b | 908 | #endif /* SVR4_SHARED_LIBS */ |
c906108c SS |
909 | |
910 | /* | |
911 | ||
c5aa993b | 912 | LOCAL FUNCTION |
c906108c | 913 | |
c5aa993b | 914 | locate_base -- locate the base address of dynamic linker structs |
c906108c | 915 | |
c5aa993b | 916 | SYNOPSIS |
c906108c | 917 | |
c5aa993b | 918 | CORE_ADDR locate_base (void) |
c906108c | 919 | |
c5aa993b | 920 | DESCRIPTION |
c906108c | 921 | |
c5aa993b JM |
922 | For both the SunOS and SVR4 shared library implementations, if the |
923 | inferior executable has been linked dynamically, there is a single | |
924 | address somewhere in the inferior's data space which is the key to | |
925 | locating all of the dynamic linker's runtime structures. This | |
926 | address is the value of the debug base symbol. The job of this | |
927 | function is to find and return that address, or to return 0 if there | |
928 | is no such address (the executable is statically linked for example). | |
c906108c | 929 | |
c5aa993b JM |
930 | For SunOS, the job is almost trivial, since the dynamic linker and |
931 | all of it's structures are statically linked to the executable at | |
932 | link time. Thus the symbol for the address we are looking for has | |
933 | already been added to the minimal symbol table for the executable's | |
934 | objfile at the time the symbol file's symbols were read, and all we | |
935 | have to do is look it up there. Note that we explicitly do NOT want | |
936 | to find the copies in the shared library. | |
c906108c | 937 | |
c5aa993b JM |
938 | The SVR4 version is a bit more complicated because the address |
939 | is contained somewhere in the dynamic info section. We have to go | |
940 | to a lot more work to discover the address of the debug base symbol. | |
941 | Because of this complexity, we cache the value we find and return that | |
942 | value on subsequent invocations. Note there is no copy in the | |
943 | executable symbol tables. | |
c906108c SS |
944 | |
945 | */ | |
946 | ||
947 | static CORE_ADDR | |
fba45db2 | 948 | locate_base (void) |
c906108c SS |
949 | { |
950 | ||
951 | #ifndef SVR4_SHARED_LIBS | |
952 | ||
953 | struct minimal_symbol *msymbol; | |
954 | CORE_ADDR address = 0; | |
955 | char **symbolp; | |
956 | ||
957 | /* For SunOS, we want to limit the search for the debug base symbol to the | |
958 | executable being debugged, since there is a duplicate named symbol in the | |
959 | shared library. We don't want the shared library versions. */ | |
960 | ||
961 | for (symbolp = debug_base_symbols; *symbolp != NULL; symbolp++) | |
962 | { | |
963 | msymbol = lookup_minimal_symbol (*symbolp, NULL, symfile_objfile); | |
964 | if ((msymbol != NULL) && (SYMBOL_VALUE_ADDRESS (msymbol) != 0)) | |
965 | { | |
966 | address = SYMBOL_VALUE_ADDRESS (msymbol); | |
967 | return (address); | |
968 | } | |
969 | } | |
970 | return (0); | |
971 | ||
c5aa993b | 972 | #else /* SVR4_SHARED_LIBS */ |
c906108c SS |
973 | |
974 | /* Check to see if we have a currently valid address, and if so, avoid | |
975 | doing all this work again and just return the cached address. If | |
976 | we have no cached address, try to locate it in the dynamic info | |
977 | section for ELF executables. */ | |
978 | ||
979 | if (debug_base == 0) | |
980 | { | |
981 | if (exec_bfd != NULL | |
982 | && bfd_get_flavour (exec_bfd) == bfd_target_elf_flavour) | |
983 | debug_base = elf_locate_base (); | |
984 | #ifdef HANDLE_SVR4_EXEC_EMULATORS | |
985 | /* Try it the hard way for emulated executables. */ | |
986 | else if (inferior_pid != 0 && target_has_execution) | |
987 | proc_iterate_over_mappings (look_for_base); | |
988 | #endif | |
989 | } | |
990 | return (debug_base); | |
991 | ||
c5aa993b | 992 | #endif /* !SVR4_SHARED_LIBS */ |
c906108c SS |
993 | |
994 | } | |
995 | ||
996 | /* | |
997 | ||
c5aa993b | 998 | LOCAL FUNCTION |
c906108c | 999 | |
c5aa993b | 1000 | first_link_map_member -- locate first member in dynamic linker's map |
c906108c | 1001 | |
c5aa993b | 1002 | SYNOPSIS |
c906108c | 1003 | |
07cd4b97 | 1004 | static CORE_ADDR first_link_map_member (void) |
c906108c | 1005 | |
c5aa993b | 1006 | DESCRIPTION |
c906108c | 1007 | |
9ddea9f1 JB |
1008 | Find the first element in the inferior's dynamic link map, and |
1009 | return its address in the inferior. This function doesn't copy the | |
07cd4b97 | 1010 | link map entry itself into our address space; current_sos actually |
9ddea9f1 | 1011 | does the reading. */ |
c906108c | 1012 | |
07cd4b97 | 1013 | static CORE_ADDR |
fba45db2 | 1014 | first_link_map_member (void) |
c906108c | 1015 | { |
07cd4b97 | 1016 | CORE_ADDR lm = 0; |
c906108c SS |
1017 | |
1018 | #ifndef SVR4_SHARED_LIBS | |
1019 | ||
1020 | read_memory (debug_base, (char *) &dynamic_copy, sizeof (dynamic_copy)); | |
1021 | if (dynamic_copy.ld_version >= 2) | |
1022 | { | |
1023 | /* It is a version that we can deal with, so read in the secondary | |
c5aa993b | 1024 | structure and find the address of the link map list from it. */ |
07cd4b97 JB |
1025 | read_memory (SOLIB_EXTRACT_ADDRESS (dynamic_copy.ld_un.ld_2), |
1026 | (char *) &ld_2_copy, sizeof (struct link_dynamic_2)); | |
1027 | lm = SOLIB_EXTRACT_ADDRESS (ld_2_copy.ld_loaded); | |
c906108c SS |
1028 | } |
1029 | ||
c5aa993b | 1030 | #else /* SVR4_SHARED_LIBS */ |
23e04971 | 1031 | #if defined (HAVE_STRUCT_LINK_MAP32) |
359431fb | 1032 | if (bfd_get_arch_size (exec_bfd) == 32) |
23e04971 MS |
1033 | { |
1034 | read_memory (debug_base, (char *) &debug32_copy, | |
1035 | sizeof (struct r_debug32)); | |
1036 | lm = SOLIB_EXTRACT_ADDRESS (debug32_copy.r_map); | |
1037 | } | |
1038 | else | |
1039 | #endif | |
1040 | { | |
1041 | read_memory (debug_base, (char *) &debug_copy, | |
1042 | sizeof (struct r_debug)); | |
1043 | lm = SOLIB_EXTRACT_ADDRESS (debug_copy.r_map); | |
1044 | } | |
c906108c SS |
1045 | /* FIXME: Perhaps we should validate the info somehow, perhaps by |
1046 | checking r_version for a known version number, or r_state for | |
1047 | RT_CONSISTENT. */ | |
c906108c | 1048 | |
c5aa993b | 1049 | #endif /* !SVR4_SHARED_LIBS */ |
c906108c SS |
1050 | |
1051 | return (lm); | |
1052 | } | |
1053 | ||
104c1213 JM |
1054 | #ifdef SVR4_SHARED_LIBS |
1055 | /* | |
1056 | ||
1057 | LOCAL FUNCTION | |
1058 | ||
9452d09b | 1059 | open_symbol_file_object |
104c1213 JM |
1060 | |
1061 | SYNOPSIS | |
1062 | ||
55e0deaa | 1063 | int open_symbol_file_object (void *from_ttyp) |
104c1213 JM |
1064 | |
1065 | DESCRIPTION | |
1066 | ||
1067 | If no open symbol file, attempt to locate and open the main symbol | |
1068 | file. On SVR4 systems, this is the first link map entry. If its | |
1069 | name is here, we can open it. Useful when attaching to a process | |
1070 | without first loading its symbol file. | |
1071 | ||
7ff09628 KB |
1072 | If FROM_TTYP dereferences to a non-zero integer, allow messages to |
1073 | be printed. This parameter is a pointer rather than an int because | |
1074 | open_symbol_file_object() is called via catch_errors() and | |
1075 | catch_errors() requires a pointer argument. */ | |
104c1213 | 1076 | |
9452d09b | 1077 | static int |
55e0deaa | 1078 | open_symbol_file_object (void *from_ttyp) |
104c1213 | 1079 | { |
07cd4b97 | 1080 | CORE_ADDR lm; |
104c1213 JM |
1081 | char *filename; |
1082 | int errcode; | |
55e0deaa | 1083 | int from_tty = *(int *)from_ttyp; |
104c1213 JM |
1084 | |
1085 | if (symfile_objfile) | |
1086 | if (!query ("Attempt to reload symbols from process? ")) | |
1087 | return 0; | |
1088 | ||
1089 | if ((debug_base = locate_base ()) == 0) | |
1090 | return 0; /* failed somehow... */ | |
1091 | ||
1092 | /* First link map member should be the executable. */ | |
07cd4b97 | 1093 | if ((lm = first_link_map_member ()) == 0) |
104c1213 JM |
1094 | return 0; /* failed somehow... */ |
1095 | ||
23e04971 | 1096 | #if defined (HAVE_STRUCT_LINK_MAP32) |
359431fb | 1097 | if (bfd_get_arch_size (exec_bfd) == 32) |
23e04971 MS |
1098 | { |
1099 | struct link_map32 lmcopy; | |
1100 | /* Read from target memory to GDB. */ | |
1101 | read_memory (lm, (void *) &lmcopy, sizeof (lmcopy)); | |
1102 | ||
1103 | if (lmcopy.l_name == 0) | |
1104 | return 0; /* no filename. */ | |
1105 | ||
1106 | /* Now fetch the filename from target memory. */ | |
1107 | target_read_string (SOLIB_EXTRACT_ADDRESS (lmcopy.l_name), | |
1108 | &filename, MAX_PATH_SIZE - 1, &errcode); | |
1109 | } | |
1110 | else | |
1111 | #endif /* HAVE_STRUCT_LINK_MAP32 */ | |
1112 | { | |
1113 | struct link_map lmcopy; | |
1114 | /* Read from target memory to GDB. */ | |
1115 | read_memory (lm, (void *) &lmcopy, sizeof (lmcopy)); | |
1116 | ||
1117 | if (lmcopy.l_name == 0) | |
1118 | return 0; /* no filename. */ | |
104c1213 | 1119 | |
23e04971 MS |
1120 | /* Now fetch the filename from target memory. */ |
1121 | target_read_string (SOLIB_EXTRACT_ADDRESS (lmcopy.l_name), &filename, | |
1122 | MAX_PATH_SIZE - 1, &errcode); | |
1123 | } | |
104c1213 | 1124 | |
104c1213 JM |
1125 | if (errcode) |
1126 | { | |
1127 | warning ("failed to read exec filename from attached file: %s", | |
1128 | safe_strerror (errcode)); | |
1129 | return 0; | |
1130 | } | |
1131 | ||
74b7792f | 1132 | make_cleanup (free, filename); |
104c1213 | 1133 | /* Have a pathname: read the symbol file. */ |
55e0deaa | 1134 | symbol_file_command (filename, from_tty); |
104c1213 JM |
1135 | |
1136 | return 1; | |
1137 | } | |
1138 | #endif /* SVR4_SHARED_LIBS */ | |
1139 | ||
c906108c | 1140 | |
07cd4b97 | 1141 | /* LOCAL FUNCTION |
c906108c | 1142 | |
07cd4b97 | 1143 | free_so --- free a `struct so_list' object |
c906108c | 1144 | |
c5aa993b | 1145 | SYNOPSIS |
c906108c | 1146 | |
07cd4b97 | 1147 | void free_so (struct so_list *so) |
c906108c | 1148 | |
c5aa993b | 1149 | DESCRIPTION |
c906108c | 1150 | |
07cd4b97 JB |
1151 | Free the storage associated with the `struct so_list' object SO. |
1152 | If we have opened a BFD for SO, close it. | |
c906108c | 1153 | |
07cd4b97 JB |
1154 | The caller is responsible for removing SO from whatever list it is |
1155 | a member of. If we have placed SO's sections in some target's | |
1156 | section table, the caller is responsible for removing them. | |
c906108c | 1157 | |
07cd4b97 JB |
1158 | This function doesn't mess with objfiles at all. If there is an |
1159 | objfile associated with SO that needs to be removed, the caller is | |
1160 | responsible for taking care of that. */ | |
1161 | ||
1162 | static void | |
1163 | free_so (struct so_list *so) | |
c906108c | 1164 | { |
07cd4b97 | 1165 | char *bfd_filename = 0; |
c5aa993b | 1166 | |
07cd4b97 JB |
1167 | if (so->sections) |
1168 | free (so->sections); | |
1169 | ||
1170 | if (so->abfd) | |
c906108c | 1171 | { |
07cd4b97 JB |
1172 | bfd_filename = bfd_get_filename (so->abfd); |
1173 | if (! bfd_close (so->abfd)) | |
1174 | warning ("cannot close \"%s\": %s", | |
1175 | bfd_filename, bfd_errmsg (bfd_get_error ())); | |
c906108c | 1176 | } |
07cd4b97 JB |
1177 | |
1178 | if (bfd_filename) | |
1179 | free (bfd_filename); | |
1180 | ||
1181 | free (so); | |
1182 | } | |
1183 | ||
1184 | ||
1185 | /* On some systems, the only way to recognize the link map entry for | |
1186 | the main executable file is by looking at its name. Return | |
1187 | non-zero iff SONAME matches one of the known main executable names. */ | |
1188 | ||
1189 | static int | |
fba45db2 | 1190 | match_main (char *soname) |
07cd4b97 JB |
1191 | { |
1192 | char **mainp; | |
1193 | ||
1194 | for (mainp = main_name_list; *mainp != NULL; mainp++) | |
c906108c | 1195 | { |
07cd4b97 JB |
1196 | if (strcmp (soname, *mainp) == 0) |
1197 | return (1); | |
c906108c | 1198 | } |
07cd4b97 JB |
1199 | |
1200 | return (0); | |
1201 | } | |
1202 | ||
1203 | ||
1204 | /* LOCAL FUNCTION | |
1205 | ||
1206 | current_sos -- build a list of currently loaded shared objects | |
1207 | ||
1208 | SYNOPSIS | |
1209 | ||
1210 | struct so_list *current_sos () | |
1211 | ||
1212 | DESCRIPTION | |
1213 | ||
1214 | Build a list of `struct so_list' objects describing the shared | |
1215 | objects currently loaded in the inferior. This list does not | |
1216 | include an entry for the main executable file. | |
1217 | ||
1218 | Note that we only gather information directly available from the | |
1219 | inferior --- we don't examine any of the shared library files | |
1220 | themselves. The declaration of `struct so_list' says which fields | |
1221 | we provide values for. */ | |
1222 | ||
1223 | static struct so_list * | |
fba45db2 | 1224 | current_sos (void) |
07cd4b97 JB |
1225 | { |
1226 | CORE_ADDR lm; | |
1227 | struct so_list *head = 0; | |
1228 | struct so_list **link_ptr = &head; | |
1229 | ||
1230 | /* Make sure we've looked up the inferior's dynamic linker's base | |
1231 | structure. */ | |
1232 | if (! debug_base) | |
c906108c | 1233 | { |
07cd4b97 JB |
1234 | debug_base = locate_base (); |
1235 | ||
1236 | /* If we can't find the dynamic linker's base structure, this | |
1237 | must not be a dynamically linked executable. Hmm. */ | |
1238 | if (! debug_base) | |
1239 | return 0; | |
1240 | } | |
1241 | ||
1242 | /* Walk the inferior's link map list, and build our list of | |
1243 | `struct so_list' nodes. */ | |
1244 | lm = first_link_map_member (); | |
1245 | while (lm) | |
1246 | { | |
1247 | struct so_list *new | |
1248 | = (struct so_list *) xmalloc (sizeof (struct so_list)); | |
15588ebb | 1249 | struct cleanup *old_chain = make_cleanup (free, new); |
07cd4b97 JB |
1250 | memset (new, 0, sizeof (*new)); |
1251 | ||
c5aa993b | 1252 | new->lmaddr = lm; |
23e04971 MS |
1253 | |
1254 | #if defined (HAVE_STRUCT_LINK_MAP32) | |
359431fb | 1255 | if (bfd_get_arch_size (exec_bfd) == 32) |
23e04971 MS |
1256 | read_memory (lm, (char *) &(new->lm32), sizeof (struct link_map32)); |
1257 | else | |
1258 | #endif | |
1259 | read_memory (lm, (char *) &(new->lm), sizeof (struct link_map)); | |
c906108c | 1260 | |
07cd4b97 | 1261 | lm = LM_NEXT (new); |
c5aa993b | 1262 | |
c906108c | 1263 | /* For SVR4 versions, the first entry in the link map is for the |
c5aa993b JM |
1264 | inferior executable, so we must ignore it. For some versions of |
1265 | SVR4, it has no name. For others (Solaris 2.3 for example), it | |
1266 | does have a name, so we can no longer use a missing name to | |
1267 | decide when to ignore it. */ | |
07cd4b97 | 1268 | if (IGNORE_FIRST_LINK_MAP_ENTRY (new)) |
15588ebb | 1269 | free_so (new); |
07cd4b97 | 1270 | else |
c906108c SS |
1271 | { |
1272 | int errcode; | |
1273 | char *buffer; | |
07cd4b97 JB |
1274 | |
1275 | /* Extract this shared object's name. */ | |
1276 | target_read_string (LM_NAME (new), &buffer, | |
c906108c SS |
1277 | MAX_PATH_SIZE - 1, &errcode); |
1278 | if (errcode != 0) | |
1279 | { | |
07cd4b97 | 1280 | warning ("current_sos: Can't read pathname for load map: %s\n", |
c906108c | 1281 | safe_strerror (errcode)); |
c906108c | 1282 | } |
07cd4b97 JB |
1283 | else |
1284 | { | |
1285 | strncpy (new->so_name, buffer, MAX_PATH_SIZE - 1); | |
1286 | new->so_name[MAX_PATH_SIZE - 1] = '\0'; | |
1287 | free (buffer); | |
1288 | strcpy (new->so_original_name, new->so_name); | |
1289 | } | |
1290 | ||
1291 | /* If this entry has no name, or its name matches the name | |
1292 | for the main executable, don't include it in the list. */ | |
1293 | if (! new->so_name[0] | |
1294 | || match_main (new->so_name)) | |
1295 | free_so (new); | |
1296 | else | |
1297 | { | |
1298 | new->next = 0; | |
1299 | *link_ptr = new; | |
1300 | link_ptr = &new->next; | |
1301 | } | |
c5aa993b | 1302 | } |
15588ebb JB |
1303 | |
1304 | discard_cleanups (old_chain); | |
c906108c | 1305 | } |
07cd4b97 JB |
1306 | |
1307 | return head; | |
c906108c SS |
1308 | } |
1309 | ||
07cd4b97 | 1310 | |
c906108c SS |
1311 | /* A small stub to get us past the arg-passing pinhole of catch_errors. */ |
1312 | ||
1313 | static int | |
fba45db2 | 1314 | symbol_add_stub (PTR arg) |
c906108c | 1315 | { |
07cd4b97 | 1316 | register struct so_list *so = (struct so_list *) arg; /* catch_errs bogon */ |
62557bbc | 1317 | struct section_addr_info *sap; |
9e124216 EZ |
1318 | CORE_ADDR lowest_addr = 0; |
1319 | int lowest_index; | |
1320 | asection *lowest_sect = NULL; | |
c906108c | 1321 | |
07cd4b97 JB |
1322 | /* Have we already loaded this shared object? */ |
1323 | ALL_OBJFILES (so->objfile) | |
1324 | { | |
1325 | if (strcmp (so->objfile->name, so->so_name) == 0) | |
1326 | return 1; | |
1327 | } | |
1328 | ||
1329 | /* Find the shared object's text segment. */ | |
c5aa993b | 1330 | if (so->textsection) |
9e124216 EZ |
1331 | { |
1332 | lowest_addr = so->textsection->addr; | |
1333 | lowest_sect = bfd_get_section_by_name (so->abfd, ".text"); | |
1334 | lowest_index = lowest_sect->index; | |
1335 | } | |
c5aa993b | 1336 | else if (so->abfd != NULL) |
c906108c | 1337 | { |
9e124216 EZ |
1338 | /* If we didn't find a mapped non zero sized .text section, set |
1339 | up lowest_addr so that the relocation in symbol_file_add does | |
1340 | no harm. */ | |
c5aa993b | 1341 | lowest_sect = bfd_get_section_by_name (so->abfd, ".text"); |
c906108c | 1342 | if (lowest_sect == NULL) |
c5aa993b | 1343 | bfd_map_over_sections (so->abfd, find_lowest_section, |
96baa820 | 1344 | (PTR) &lowest_sect); |
c906108c | 1345 | if (lowest_sect) |
9e124216 EZ |
1346 | { |
1347 | lowest_addr = bfd_section_vma (so->abfd, lowest_sect) | |
1348 | + LM_ADDR (so); | |
1349 | lowest_index = lowest_sect->index; | |
1350 | } | |
c906108c | 1351 | } |
c5aa993b | 1352 | |
62557bbc KB |
1353 | sap = build_section_addr_info_from_section_table (so->sections, |
1354 | so->sections_end); | |
e7cf9df1 | 1355 | |
9e124216 EZ |
1356 | sap->other[lowest_index].addr = lowest_addr; |
1357 | ||
62557bbc KB |
1358 | so->objfile = symbol_file_add (so->so_name, so->from_tty, |
1359 | sap, 0, OBJF_SHARED); | |
1360 | free_section_addr_info (sap); | |
c906108c | 1361 | |
07cd4b97 | 1362 | return (1); |
c906108c SS |
1363 | } |
1364 | ||
c906108c | 1365 | |
07cd4b97 | 1366 | /* LOCAL FUNCTION |
c906108c | 1367 | |
105b175f | 1368 | update_solib_list --- synchronize GDB's shared object list with inferior's |
c906108c | 1369 | |
c5aa993b | 1370 | SYNOPSIS |
c906108c | 1371 | |
105b175f | 1372 | void update_solib_list (int from_tty, struct target_ops *TARGET) |
c906108c | 1373 | |
07cd4b97 | 1374 | Extract the list of currently loaded shared objects from the |
105b175f JB |
1375 | inferior, and compare it with the list of shared objects currently |
1376 | in GDB's so_list_head list. Edit so_list_head to bring it in sync | |
1377 | with the inferior's new list. | |
c906108c | 1378 | |
105b175f JB |
1379 | If we notice that the inferior has unloaded some shared objects, |
1380 | free any symbolic info GDB had read about those shared objects. | |
1381 | ||
1382 | Don't load symbolic info for any new shared objects; just add them | |
1383 | to the list, and leave their symbols_loaded flag clear. | |
07cd4b97 JB |
1384 | |
1385 | If FROM_TTY is non-null, feel free to print messages about what | |
1386 | we're doing. | |
c906108c | 1387 | |
07cd4b97 JB |
1388 | If TARGET is non-null, add the sections of all new shared objects |
1389 | to TARGET's section table. Note that this doesn't remove any | |
1390 | sections for shared objects that have been unloaded, and it | |
1391 | doesn't check to see if the new shared objects are already present in | |
1392 | the section table. But we only use this for core files and | |
1393 | processes we've just attached to, so that's okay. */ | |
c906108c | 1394 | |
07cd4b97 | 1395 | void |
105b175f | 1396 | update_solib_list (int from_tty, struct target_ops *target) |
07cd4b97 JB |
1397 | { |
1398 | struct so_list *inferior = current_sos (); | |
1399 | struct so_list *gdb, **gdb_link; | |
1400 | ||
104c1213 JM |
1401 | #ifdef SVR4_SHARED_LIBS |
1402 | /* If we are attaching to a running process for which we | |
1403 | have not opened a symbol file, we may be able to get its | |
1404 | symbols now! */ | |
1405 | if (attach_flag && | |
1406 | symfile_objfile == NULL) | |
9452d09b | 1407 | catch_errors (open_symbol_file_object, (PTR) &from_tty, |
104c1213 JM |
1408 | "Error reading attached process's symbol file.\n", |
1409 | RETURN_MASK_ALL); | |
1410 | ||
1411 | #endif SVR4_SHARED_LIBS | |
1412 | ||
07cd4b97 JB |
1413 | /* Since this function might actually add some elements to the |
1414 | so_list_head list, arrange for it to be cleaned up when | |
1415 | appropriate. */ | |
1416 | if (!solib_cleanup_queued) | |
1417 | { | |
1418 | make_run_cleanup (do_clear_solib, NULL); | |
1419 | solib_cleanup_queued = 1; | |
c906108c | 1420 | } |
c5aa993b | 1421 | |
07cd4b97 JB |
1422 | /* GDB and the inferior's dynamic linker each maintain their own |
1423 | list of currently loaded shared objects; we want to bring the | |
1424 | former in sync with the latter. Scan both lists, seeing which | |
1425 | shared objects appear where. There are three cases: | |
1426 | ||
1427 | - A shared object appears on both lists. This means that GDB | |
105b175f JB |
1428 | knows about it already, and it's still loaded in the inferior. |
1429 | Nothing needs to happen. | |
07cd4b97 JB |
1430 | |
1431 | - A shared object appears only on GDB's list. This means that | |
105b175f JB |
1432 | the inferior has unloaded it. We should remove the shared |
1433 | object from GDB's tables. | |
07cd4b97 JB |
1434 | |
1435 | - A shared object appears only on the inferior's list. This | |
105b175f JB |
1436 | means that it's just been loaded. We should add it to GDB's |
1437 | tables. | |
07cd4b97 JB |
1438 | |
1439 | So we walk GDB's list, checking each entry to see if it appears | |
1440 | in the inferior's list too. If it does, no action is needed, and | |
1441 | we remove it from the inferior's list. If it doesn't, the | |
1442 | inferior has unloaded it, and we remove it from GDB's list. By | |
1443 | the time we're done walking GDB's list, the inferior's list | |
1444 | contains only the new shared objects, which we then add. */ | |
1445 | ||
1446 | gdb = so_list_head; | |
1447 | gdb_link = &so_list_head; | |
1448 | while (gdb) | |
c906108c | 1449 | { |
07cd4b97 JB |
1450 | struct so_list *i = inferior; |
1451 | struct so_list **i_link = &inferior; | |
1452 | ||
1453 | /* Check to see whether the shared object *gdb also appears in | |
1454 | the inferior's current list. */ | |
1455 | while (i) | |
c906108c | 1456 | { |
07cd4b97 JB |
1457 | if (! strcmp (gdb->so_original_name, i->so_original_name)) |
1458 | break; | |
1459 | ||
1460 | i_link = &i->next; | |
1461 | i = *i_link; | |
c906108c | 1462 | } |
c5aa993b | 1463 | |
07cd4b97 JB |
1464 | /* If the shared object appears on the inferior's list too, then |
1465 | it's still loaded, so we don't need to do anything. Delete | |
1466 | it from the inferior's list, and leave it on GDB's list. */ | |
1467 | if (i) | |
c906108c | 1468 | { |
07cd4b97 | 1469 | *i_link = i->next; |
07cd4b97 JB |
1470 | free_so (i); |
1471 | gdb_link = &gdb->next; | |
1472 | gdb = *gdb_link; | |
1473 | } | |
1474 | ||
1475 | /* If it's not on the inferior's list, remove it from GDB's tables. */ | |
1476 | else | |
1477 | { | |
1478 | *gdb_link = gdb->next; | |
07cd4b97 JB |
1479 | |
1480 | /* Unless the user loaded it explicitly, free SO's objfile. */ | |
e8930304 | 1481 | if (gdb->objfile && ! (gdb->objfile->flags & OBJF_USERLOADED)) |
07cd4b97 JB |
1482 | free_objfile (gdb->objfile); |
1483 | ||
1484 | /* Some targets' section tables might be referring to | |
1485 | sections from so->abfd; remove them. */ | |
1486 | remove_target_sections (gdb->abfd); | |
1487 | ||
1488 | free_so (gdb); | |
1489 | gdb = *gdb_link; | |
c906108c SS |
1490 | } |
1491 | } | |
c5aa993b | 1492 | |
07cd4b97 JB |
1493 | /* Now the inferior's list contains only shared objects that don't |
1494 | appear in GDB's list --- those that are newly loaded. Add them | |
e8930304 | 1495 | to GDB's shared object list. */ |
07cd4b97 | 1496 | if (inferior) |
c906108c | 1497 | { |
07cd4b97 JB |
1498 | struct so_list *i; |
1499 | ||
1500 | /* Add the new shared objects to GDB's list. */ | |
1501 | *gdb_link = inferior; | |
1502 | ||
e8930304 | 1503 | /* Fill in the rest of each of the `struct so_list' nodes. */ |
07cd4b97 | 1504 | for (i = inferior; i; i = i->next) |
c906108c | 1505 | { |
07cd4b97 JB |
1506 | i->from_tty = from_tty; |
1507 | ||
1508 | /* Fill in the rest of the `struct so_list' node. */ | |
1509 | catch_errors (solib_map_sections, i, | |
1510 | "Error while mapping shared library sections:\n", | |
1511 | RETURN_MASK_ALL); | |
07cd4b97 JB |
1512 | } |
1513 | ||
1514 | /* If requested, add the shared objects' sections to the the | |
1515 | TARGET's section table. */ | |
1516 | if (target) | |
1517 | { | |
1518 | int new_sections; | |
1519 | ||
1520 | /* Figure out how many sections we'll need to add in total. */ | |
1521 | new_sections = 0; | |
1522 | for (i = inferior; i; i = i->next) | |
1523 | new_sections += (i->sections_end - i->sections); | |
1524 | ||
1525 | if (new_sections > 0) | |
c906108c | 1526 | { |
07cd4b97 JB |
1527 | int space = target_resize_to_sections (target, new_sections); |
1528 | ||
1529 | for (i = inferior; i; i = i->next) | |
1530 | { | |
1531 | int count = (i->sections_end - i->sections); | |
1532 | memcpy (target->to_sections + space, | |
1533 | i->sections, | |
1534 | count * sizeof (i->sections[0])); | |
1535 | space += count; | |
1536 | } | |
c906108c SS |
1537 | } |
1538 | } | |
e8930304 | 1539 | } |
105b175f JB |
1540 | } |
1541 | ||
1542 | ||
1543 | /* GLOBAL FUNCTION | |
1544 | ||
1545 | solib_add -- read in symbol info for newly added shared libraries | |
1546 | ||
1547 | SYNOPSIS | |
1548 | ||
1549 | void solib_add (char *pattern, int from_tty, struct target_ops *TARGET) | |
1550 | ||
1551 | DESCRIPTION | |
1552 | ||
1553 | Read in symbolic information for any shared objects whose names | |
1554 | match PATTERN. (If we've already read a shared object's symbol | |
1555 | info, leave it alone.) If PATTERN is zero, read them all. | |
1556 | ||
1557 | FROM_TTY and TARGET are as described for update_solib_list, above. */ | |
1558 | ||
1559 | void | |
1560 | solib_add (char *pattern, int from_tty, struct target_ops *target) | |
1561 | { | |
1562 | struct so_list *gdb; | |
1563 | ||
1564 | if (pattern) | |
1565 | { | |
1566 | char *re_err = re_comp (pattern); | |
1567 | ||
1568 | if (re_err) | |
1569 | error ("Invalid regexp: %s", re_err); | |
1570 | } | |
1571 | ||
1572 | update_solib_list (from_tty, target); | |
c906108c | 1573 | |
105b175f JB |
1574 | /* Walk the list of currently loaded shared libraries, and read |
1575 | symbols for any that match the pattern --- or any whose symbols | |
1576 | aren't already loaded, if no pattern was given. */ | |
e8930304 JB |
1577 | { |
1578 | int any_matches = 0; | |
1579 | int loaded_any_symbols = 0; | |
c906108c | 1580 | |
e8930304 JB |
1581 | for (gdb = so_list_head; gdb; gdb = gdb->next) |
1582 | if (! pattern || re_exec (gdb->so_name)) | |
1583 | { | |
1584 | any_matches = 1; | |
1585 | ||
1586 | if (gdb->symbols_loaded) | |
1587 | { | |
1588 | if (from_tty) | |
1589 | printf_unfiltered ("Symbols already loaded for %s\n", | |
1590 | gdb->so_name); | |
1591 | } | |
1592 | else | |
1593 | { | |
1594 | if (catch_errors | |
1595 | (symbol_add_stub, gdb, | |
1596 | "Error while reading shared library symbols:\n", | |
1597 | RETURN_MASK_ALL)) | |
1598 | { | |
1599 | if (from_tty) | |
1600 | printf_unfiltered ("Loaded symbols for %s\n", | |
1601 | gdb->so_name); | |
1602 | gdb->symbols_loaded = 1; | |
1603 | loaded_any_symbols = 1; | |
1604 | } | |
1605 | } | |
1606 | } | |
1607 | ||
1608 | if (from_tty && pattern && ! any_matches) | |
1609 | printf_unfiltered | |
1610 | ("No loaded shared libraries match the pattern `%s'.\n", pattern); | |
1611 | ||
1612 | if (loaded_any_symbols) | |
1613 | { | |
1614 | /* Getting new symbols may change our opinion about what is | |
1615 | frameless. */ | |
1616 | reinit_frame_cache (); | |
1617 | ||
1618 | special_symbol_handling (); | |
1619 | } | |
1620 | } | |
c906108c SS |
1621 | } |
1622 | ||
07cd4b97 | 1623 | |
c906108c SS |
1624 | /* |
1625 | ||
c5aa993b | 1626 | LOCAL FUNCTION |
c906108c | 1627 | |
c5aa993b | 1628 | info_sharedlibrary_command -- code for "info sharedlibrary" |
c906108c | 1629 | |
c5aa993b | 1630 | SYNOPSIS |
c906108c | 1631 | |
c5aa993b | 1632 | static void info_sharedlibrary_command () |
c906108c | 1633 | |
c5aa993b | 1634 | DESCRIPTION |
c906108c | 1635 | |
c5aa993b JM |
1636 | Walk through the shared library list and print information |
1637 | about each attached library. | |
1638 | */ | |
c906108c SS |
1639 | |
1640 | static void | |
fba45db2 | 1641 | info_sharedlibrary_command (char *ignore, int from_tty) |
c906108c | 1642 | { |
c5aa993b | 1643 | register struct so_list *so = NULL; /* link map state variable */ |
c906108c SS |
1644 | int header_done = 0; |
1645 | int addr_width; | |
1646 | char *addr_fmt; | |
f5b8946c | 1647 | int arch_size; |
c906108c SS |
1648 | |
1649 | if (exec_bfd == NULL) | |
1650 | { | |
4ce44c66 | 1651 | printf_unfiltered ("No executable file.\n"); |
c906108c SS |
1652 | return; |
1653 | } | |
1654 | ||
6ceadee4 | 1655 | arch_size = bfd_get_arch_size (exec_bfd); |
f5b8946c MS |
1656 | /* Default to 32-bit in case of failure (non-elf). */ |
1657 | if (arch_size == 32 || arch_size == -1) | |
1658 | { | |
1659 | addr_width = 8 + 4; | |
1660 | addr_fmt = "08l"; | |
1661 | } | |
1662 | else if (arch_size == 64) | |
1663 | { | |
1664 | addr_width = 16 + 4; | |
1665 | addr_fmt = "016l"; | |
1666 | } | |
c906108c | 1667 | |
105b175f | 1668 | update_solib_list (from_tty, 0); |
07cd4b97 JB |
1669 | |
1670 | for (so = so_list_head; so; so = so->next) | |
c906108c | 1671 | { |
c5aa993b | 1672 | if (so->so_name[0]) |
c906108c SS |
1673 | { |
1674 | if (!header_done) | |
1675 | { | |
c5aa993b JM |
1676 | printf_unfiltered ("%-*s%-*s%-12s%s\n", addr_width, "From", |
1677 | addr_width, "To", "Syms Read", | |
1678 | "Shared Object Library"); | |
c906108c SS |
1679 | header_done++; |
1680 | } | |
1681 | ||
1682 | printf_unfiltered ("%-*s", addr_width, | |
c5aa993b JM |
1683 | local_hex_string_custom ((unsigned long) LM_ADDR (so), |
1684 | addr_fmt)); | |
c906108c | 1685 | printf_unfiltered ("%-*s", addr_width, |
c5aa993b JM |
1686 | local_hex_string_custom ((unsigned long) so->lmend, |
1687 | addr_fmt)); | |
1688 | printf_unfiltered ("%-12s", so->symbols_loaded ? "Yes" : "No"); | |
1689 | printf_unfiltered ("%s\n", so->so_name); | |
c906108c SS |
1690 | } |
1691 | } | |
1692 | if (so_list_head == NULL) | |
1693 | { | |
c5aa993b | 1694 | printf_unfiltered ("No shared libraries loaded at this time.\n"); |
c906108c SS |
1695 | } |
1696 | } | |
1697 | ||
1698 | /* | |
1699 | ||
c5aa993b | 1700 | GLOBAL FUNCTION |
c906108c | 1701 | |
c5aa993b | 1702 | solib_address -- check to see if an address is in a shared lib |
c906108c | 1703 | |
c5aa993b | 1704 | SYNOPSIS |
c906108c | 1705 | |
c5aa993b | 1706 | char * solib_address (CORE_ADDR address) |
c906108c | 1707 | |
c5aa993b | 1708 | DESCRIPTION |
c906108c | 1709 | |
c5aa993b JM |
1710 | Provides a hook for other gdb routines to discover whether or |
1711 | not a particular address is within the mapped address space of | |
1712 | a shared library. Any address between the base mapping address | |
1713 | and the first address beyond the end of the last mapping, is | |
1714 | considered to be within the shared library address space, for | |
1715 | our purposes. | |
c906108c | 1716 | |
c5aa993b JM |
1717 | For example, this routine is called at one point to disable |
1718 | breakpoints which are in shared libraries that are not currently | |
1719 | mapped in. | |
c906108c SS |
1720 | */ |
1721 | ||
1722 | char * | |
fba45db2 | 1723 | solib_address (CORE_ADDR address) |
c906108c | 1724 | { |
c5aa993b JM |
1725 | register struct so_list *so = 0; /* link map state variable */ |
1726 | ||
07cd4b97 | 1727 | for (so = so_list_head; so; so = so->next) |
c906108c | 1728 | { |
07cd4b97 JB |
1729 | if (LM_ADDR (so) <= address && address < so->lmend) |
1730 | return (so->so_name); | |
c906108c | 1731 | } |
07cd4b97 | 1732 | |
c906108c SS |
1733 | return (0); |
1734 | } | |
1735 | ||
1736 | /* Called by free_all_symtabs */ | |
1737 | ||
c5aa993b | 1738 | void |
fba45db2 | 1739 | clear_solib (void) |
c906108c | 1740 | { |
085dd6e6 JM |
1741 | /* This function is expected to handle ELF shared libraries. It is |
1742 | also used on Solaris, which can run either ELF or a.out binaries | |
1743 | (for compatibility with SunOS 4), both of which can use shared | |
1744 | libraries. So we don't know whether we have an ELF executable or | |
1745 | an a.out executable until the user chooses an executable file. | |
1746 | ||
1747 | ELF shared libraries don't get mapped into the address space | |
1748 | until after the program starts, so we'd better not try to insert | |
1749 | breakpoints in them immediately. We have to wait until the | |
1750 | dynamic linker has loaded them; we'll hit a bp_shlib_event | |
1751 | breakpoint (look for calls to create_solib_event_breakpoint) when | |
1752 | it's ready. | |
1753 | ||
1754 | SunOS shared libraries seem to be different --- they're present | |
1755 | as soon as the process begins execution, so there's no need to | |
1756 | put off inserting breakpoints. There's also nowhere to put a | |
1757 | bp_shlib_event breakpoint, so if we put it off, we'll never get | |
1758 | around to it. | |
1759 | ||
1760 | So: disable breakpoints only if we're using ELF shared libs. */ | |
1761 | if (exec_bfd != NULL | |
1762 | && bfd_get_flavour (exec_bfd) != bfd_target_aout_flavour) | |
1763 | disable_breakpoints_in_shlibs (1); | |
1764 | ||
c906108c SS |
1765 | while (so_list_head) |
1766 | { | |
07cd4b97 JB |
1767 | struct so_list *so = so_list_head; |
1768 | so_list_head = so->next; | |
1769 | free_so (so); | |
c906108c | 1770 | } |
07cd4b97 | 1771 | |
c906108c SS |
1772 | debug_base = 0; |
1773 | } | |
1774 | ||
1775 | static void | |
fba45db2 | 1776 | do_clear_solib (PTR dummy) |
c906108c SS |
1777 | { |
1778 | solib_cleanup_queued = 0; | |
1779 | clear_solib (); | |
1780 | } | |
1781 | ||
1782 | #ifdef SVR4_SHARED_LIBS | |
1783 | ||
1784 | /* Return 1 if PC lies in the dynamic symbol resolution code of the | |
1785 | SVR4 run time loader. */ | |
1786 | ||
1787 | static CORE_ADDR interp_text_sect_low; | |
1788 | static CORE_ADDR interp_text_sect_high; | |
1789 | static CORE_ADDR interp_plt_sect_low; | |
1790 | static CORE_ADDR interp_plt_sect_high; | |
1791 | ||
1792 | int | |
fba45db2 | 1793 | in_svr4_dynsym_resolve_code (CORE_ADDR pc) |
c906108c SS |
1794 | { |
1795 | return ((pc >= interp_text_sect_low && pc < interp_text_sect_high) | |
1796 | || (pc >= interp_plt_sect_low && pc < interp_plt_sect_high) | |
1797 | || in_plt_section (pc, NULL)); | |
1798 | } | |
1799 | #endif | |
1800 | ||
1801 | /* | |
1802 | ||
c5aa993b | 1803 | LOCAL FUNCTION |
c906108c | 1804 | |
c5aa993b | 1805 | disable_break -- remove the "mapping changed" breakpoint |
c906108c | 1806 | |
c5aa993b | 1807 | SYNOPSIS |
c906108c | 1808 | |
c5aa993b | 1809 | static int disable_break () |
c906108c | 1810 | |
c5aa993b | 1811 | DESCRIPTION |
c906108c | 1812 | |
c5aa993b JM |
1813 | Removes the breakpoint that gets hit when the dynamic linker |
1814 | completes a mapping change. | |
c906108c | 1815 | |
c5aa993b | 1816 | */ |
c906108c SS |
1817 | |
1818 | #ifndef SVR4_SHARED_LIBS | |
1819 | ||
1820 | static int | |
fba45db2 | 1821 | disable_break (void) |
c906108c SS |
1822 | { |
1823 | int status = 1; | |
1824 | ||
1825 | #ifndef SVR4_SHARED_LIBS | |
1826 | ||
1827 | int in_debugger = 0; | |
c5aa993b | 1828 | |
c906108c SS |
1829 | /* Read the debugger structure from the inferior to retrieve the |
1830 | address of the breakpoint and the original contents of the | |
1831 | breakpoint address. Remove the breakpoint by writing the original | |
1832 | contents back. */ | |
1833 | ||
1834 | read_memory (debug_addr, (char *) &debug_copy, sizeof (debug_copy)); | |
1835 | ||
1836 | /* Set `in_debugger' to zero now. */ | |
1837 | ||
1838 | write_memory (flag_addr, (char *) &in_debugger, sizeof (in_debugger)); | |
1839 | ||
07cd4b97 | 1840 | breakpoint_addr = SOLIB_EXTRACT_ADDRESS (debug_copy.ldd_bp_addr); |
c906108c SS |
1841 | write_memory (breakpoint_addr, (char *) &debug_copy.ldd_bp_inst, |
1842 | sizeof (debug_copy.ldd_bp_inst)); | |
1843 | ||
c5aa993b | 1844 | #else /* SVR4_SHARED_LIBS */ |
c906108c SS |
1845 | |
1846 | /* Note that breakpoint address and original contents are in our address | |
1847 | space, so we just need to write the original contents back. */ | |
1848 | ||
1849 | if (memory_remove_breakpoint (breakpoint_addr, shadow_contents) != 0) | |
1850 | { | |
1851 | status = 0; | |
1852 | } | |
1853 | ||
c5aa993b | 1854 | #endif /* !SVR4_SHARED_LIBS */ |
c906108c SS |
1855 | |
1856 | /* For the SVR4 version, we always know the breakpoint address. For the | |
1857 | SunOS version we don't know it until the above code is executed. | |
1858 | Grumble if we are stopped anywhere besides the breakpoint address. */ | |
1859 | ||
1860 | if (stop_pc != breakpoint_addr) | |
1861 | { | |
1862 | warning ("stopped at unknown breakpoint while handling shared libraries"); | |
1863 | } | |
1864 | ||
1865 | return (status); | |
1866 | } | |
1867 | ||
c5aa993b | 1868 | #endif /* #ifdef SVR4_SHARED_LIBS */ |
c906108c SS |
1869 | |
1870 | /* | |
1871 | ||
c5aa993b JM |
1872 | LOCAL FUNCTION |
1873 | ||
1874 | enable_break -- arrange for dynamic linker to hit breakpoint | |
1875 | ||
1876 | SYNOPSIS | |
1877 | ||
1878 | int enable_break (void) | |
1879 | ||
1880 | DESCRIPTION | |
1881 | ||
1882 | Both the SunOS and the SVR4 dynamic linkers have, as part of their | |
1883 | debugger interface, support for arranging for the inferior to hit | |
1884 | a breakpoint after mapping in the shared libraries. This function | |
1885 | enables that breakpoint. | |
1886 | ||
1887 | For SunOS, there is a special flag location (in_debugger) which we | |
1888 | set to 1. When the dynamic linker sees this flag set, it will set | |
1889 | a breakpoint at a location known only to itself, after saving the | |
1890 | original contents of that place and the breakpoint address itself, | |
1891 | in it's own internal structures. When we resume the inferior, it | |
1892 | will eventually take a SIGTRAP when it runs into the breakpoint. | |
1893 | We handle this (in a different place) by restoring the contents of | |
1894 | the breakpointed location (which is only known after it stops), | |
1895 | chasing around to locate the shared libraries that have been | |
1896 | loaded, then resuming. | |
1897 | ||
1898 | For SVR4, the debugger interface structure contains a member (r_brk) | |
1899 | which is statically initialized at the time the shared library is | |
1900 | built, to the offset of a function (_r_debug_state) which is guaran- | |
1901 | teed to be called once before mapping in a library, and again when | |
1902 | the mapping is complete. At the time we are examining this member, | |
1903 | it contains only the unrelocated offset of the function, so we have | |
1904 | to do our own relocation. Later, when the dynamic linker actually | |
1905 | runs, it relocates r_brk to be the actual address of _r_debug_state(). | |
1906 | ||
1907 | The debugger interface structure also contains an enumeration which | |
1908 | is set to either RT_ADD or RT_DELETE prior to changing the mapping, | |
1909 | depending upon whether or not the library is being mapped or unmapped, | |
1910 | and then set to RT_CONSISTENT after the library is mapped/unmapped. | |
1911 | */ | |
c906108c SS |
1912 | |
1913 | static int | |
fba45db2 | 1914 | enable_break (void) |
c906108c SS |
1915 | { |
1916 | int success = 0; | |
1917 | ||
1918 | #ifndef SVR4_SHARED_LIBS | |
1919 | ||
1920 | int j; | |
1921 | int in_debugger; | |
1922 | ||
1923 | /* Get link_dynamic structure */ | |
1924 | ||
1925 | j = target_read_memory (debug_base, (char *) &dynamic_copy, | |
1926 | sizeof (dynamic_copy)); | |
1927 | if (j) | |
1928 | { | |
1929 | /* unreadable */ | |
1930 | return (0); | |
1931 | } | |
1932 | ||
1933 | /* Calc address of debugger interface structure */ | |
1934 | ||
07cd4b97 | 1935 | debug_addr = SOLIB_EXTRACT_ADDRESS (dynamic_copy.ldd); |
c906108c SS |
1936 | |
1937 | /* Calc address of `in_debugger' member of debugger interface structure */ | |
1938 | ||
1939 | flag_addr = debug_addr + (CORE_ADDR) ((char *) &debug_copy.ldd_in_debugger - | |
1940 | (char *) &debug_copy); | |
1941 | ||
1942 | /* Write a value of 1 to this member. */ | |
1943 | ||
1944 | in_debugger = 1; | |
1945 | write_memory (flag_addr, (char *) &in_debugger, sizeof (in_debugger)); | |
1946 | success = 1; | |
1947 | ||
c5aa993b | 1948 | #else /* SVR4_SHARED_LIBS */ |
c906108c SS |
1949 | |
1950 | #ifdef BKPT_AT_SYMBOL | |
1951 | ||
1952 | struct minimal_symbol *msymbol; | |
1953 | char **bkpt_namep; | |
1954 | asection *interp_sect; | |
1955 | ||
1956 | /* First, remove all the solib event breakpoints. Their addresses | |
1957 | may have changed since the last time we ran the program. */ | |
1958 | remove_solib_event_breakpoints (); | |
1959 | ||
1960 | #ifdef SVR4_SHARED_LIBS | |
1961 | interp_text_sect_low = interp_text_sect_high = 0; | |
1962 | interp_plt_sect_low = interp_plt_sect_high = 0; | |
1963 | ||
1964 | /* Find the .interp section; if not found, warn the user and drop | |
1965 | into the old breakpoint at symbol code. */ | |
1966 | interp_sect = bfd_get_section_by_name (exec_bfd, ".interp"); | |
1967 | if (interp_sect) | |
1968 | { | |
1969 | unsigned int interp_sect_size; | |
1970 | char *buf; | |
1971 | CORE_ADDR load_addr; | |
1972 | bfd *tmp_bfd; | |
1973 | CORE_ADDR sym_addr = 0; | |
1974 | ||
1975 | /* Read the contents of the .interp section into a local buffer; | |
c5aa993b | 1976 | the contents specify the dynamic linker this program uses. */ |
c906108c SS |
1977 | interp_sect_size = bfd_section_size (exec_bfd, interp_sect); |
1978 | buf = alloca (interp_sect_size); | |
1979 | bfd_get_section_contents (exec_bfd, interp_sect, | |
1980 | buf, 0, interp_sect_size); | |
1981 | ||
1982 | /* Now we need to figure out where the dynamic linker was | |
c5aa993b JM |
1983 | loaded so that we can load its symbols and place a breakpoint |
1984 | in the dynamic linker itself. | |
c906108c | 1985 | |
c5aa993b JM |
1986 | This address is stored on the stack. However, I've been unable |
1987 | to find any magic formula to find it for Solaris (appears to | |
1988 | be trivial on GNU/Linux). Therefore, we have to try an alternate | |
1989 | mechanism to find the dynamic linker's base address. */ | |
c906108c SS |
1990 | tmp_bfd = bfd_openr (buf, gnutarget); |
1991 | if (tmp_bfd == NULL) | |
1992 | goto bkpt_at_symbol; | |
1993 | ||
1994 | /* Make sure the dynamic linker's really a useful object. */ | |
1995 | if (!bfd_check_format (tmp_bfd, bfd_object)) | |
1996 | { | |
1997 | warning ("Unable to grok dynamic linker %s as an object file", buf); | |
1998 | bfd_close (tmp_bfd); | |
1999 | goto bkpt_at_symbol; | |
2000 | } | |
2001 | ||
2002 | /* We find the dynamic linker's base address by examining the | |
c5aa993b JM |
2003 | current pc (which point at the entry point for the dynamic |
2004 | linker) and subtracting the offset of the entry point. */ | |
c906108c SS |
2005 | load_addr = read_pc () - tmp_bfd->start_address; |
2006 | ||
2007 | /* Record the relocated start and end address of the dynamic linker | |
c5aa993b | 2008 | text and plt section for in_svr4_dynsym_resolve_code. */ |
c906108c SS |
2009 | interp_sect = bfd_get_section_by_name (tmp_bfd, ".text"); |
2010 | if (interp_sect) | |
2011 | { | |
2012 | interp_text_sect_low = | |
2013 | bfd_section_vma (tmp_bfd, interp_sect) + load_addr; | |
2014 | interp_text_sect_high = | |
2015 | interp_text_sect_low + bfd_section_size (tmp_bfd, interp_sect); | |
2016 | } | |
2017 | interp_sect = bfd_get_section_by_name (tmp_bfd, ".plt"); | |
2018 | if (interp_sect) | |
2019 | { | |
2020 | interp_plt_sect_low = | |
2021 | bfd_section_vma (tmp_bfd, interp_sect) + load_addr; | |
2022 | interp_plt_sect_high = | |
2023 | interp_plt_sect_low + bfd_section_size (tmp_bfd, interp_sect); | |
2024 | } | |
2025 | ||
2026 | /* Now try to set a breakpoint in the dynamic linker. */ | |
2027 | for (bkpt_namep = solib_break_names; *bkpt_namep != NULL; bkpt_namep++) | |
2028 | { | |
2029 | sym_addr = bfd_lookup_symbol (tmp_bfd, *bkpt_namep); | |
2030 | if (sym_addr != 0) | |
2031 | break; | |
2032 | } | |
2033 | ||
2034 | /* We're done with the temporary bfd. */ | |
2035 | bfd_close (tmp_bfd); | |
2036 | ||
2037 | if (sym_addr != 0) | |
2038 | { | |
2039 | create_solib_event_breakpoint (load_addr + sym_addr); | |
2040 | return 1; | |
2041 | } | |
2042 | ||
2043 | /* For whatever reason we couldn't set a breakpoint in the dynamic | |
c5aa993b JM |
2044 | linker. Warn and drop into the old code. */ |
2045 | bkpt_at_symbol: | |
c906108c SS |
2046 | warning ("Unable to find dynamic linker breakpoint function.\nGDB will be unable to debug shared library initializers\nand track explicitly loaded dynamic code."); |
2047 | } | |
2048 | #endif | |
2049 | ||
2050 | /* Scan through the list of symbols, trying to look up the symbol and | |
2051 | set a breakpoint there. Terminate loop when we/if we succeed. */ | |
2052 | ||
2053 | breakpoint_addr = 0; | |
2054 | for (bkpt_namep = bkpt_names; *bkpt_namep != NULL; bkpt_namep++) | |
2055 | { | |
2056 | msymbol = lookup_minimal_symbol (*bkpt_namep, NULL, symfile_objfile); | |
2057 | if ((msymbol != NULL) && (SYMBOL_VALUE_ADDRESS (msymbol) != 0)) | |
2058 | { | |
2059 | create_solib_event_breakpoint (SYMBOL_VALUE_ADDRESS (msymbol)); | |
2060 | return 1; | |
2061 | } | |
2062 | } | |
2063 | ||
2064 | /* Nothing good happened. */ | |
2065 | success = 0; | |
2066 | ||
c5aa993b | 2067 | #endif /* BKPT_AT_SYMBOL */ |
c906108c | 2068 | |
c5aa993b | 2069 | #endif /* !SVR4_SHARED_LIBS */ |
c906108c SS |
2070 | |
2071 | return (success); | |
2072 | } | |
c5aa993b | 2073 | |
c906108c | 2074 | /* |
c5aa993b JM |
2075 | |
2076 | GLOBAL FUNCTION | |
2077 | ||
2078 | solib_create_inferior_hook -- shared library startup support | |
2079 | ||
2080 | SYNOPSIS | |
2081 | ||
2082 | void solib_create_inferior_hook() | |
2083 | ||
2084 | DESCRIPTION | |
2085 | ||
2086 | When gdb starts up the inferior, it nurses it along (through the | |
2087 | shell) until it is ready to execute it's first instruction. At this | |
2088 | point, this function gets called via expansion of the macro | |
2089 | SOLIB_CREATE_INFERIOR_HOOK. | |
2090 | ||
2091 | For SunOS executables, this first instruction is typically the | |
2092 | one at "_start", or a similar text label, regardless of whether | |
2093 | the executable is statically or dynamically linked. The runtime | |
2094 | startup code takes care of dynamically linking in any shared | |
2095 | libraries, once gdb allows the inferior to continue. | |
2096 | ||
2097 | For SVR4 executables, this first instruction is either the first | |
2098 | instruction in the dynamic linker (for dynamically linked | |
2099 | executables) or the instruction at "start" for statically linked | |
2100 | executables. For dynamically linked executables, the system | |
2101 | first exec's /lib/libc.so.N, which contains the dynamic linker, | |
2102 | and starts it running. The dynamic linker maps in any needed | |
2103 | shared libraries, maps in the actual user executable, and then | |
2104 | jumps to "start" in the user executable. | |
2105 | ||
2106 | For both SunOS shared libraries, and SVR4 shared libraries, we | |
2107 | can arrange to cooperate with the dynamic linker to discover the | |
2108 | names of shared libraries that are dynamically linked, and the | |
2109 | base addresses to which they are linked. | |
2110 | ||
2111 | This function is responsible for discovering those names and | |
2112 | addresses, and saving sufficient information about them to allow | |
2113 | their symbols to be read at a later time. | |
2114 | ||
2115 | FIXME | |
2116 | ||
2117 | Between enable_break() and disable_break(), this code does not | |
2118 | properly handle hitting breakpoints which the user might have | |
2119 | set in the startup code or in the dynamic linker itself. Proper | |
2120 | handling will probably have to wait until the implementation is | |
2121 | changed to use the "breakpoint handler function" method. | |
2122 | ||
2123 | Also, what if child has exit()ed? Must exit loop somehow. | |
2124 | */ | |
2125 | ||
2126 | void | |
fba45db2 | 2127 | solib_create_inferior_hook (void) |
c906108c SS |
2128 | { |
2129 | /* If we are using the BKPT_AT_SYMBOL code, then we don't need the base | |
2130 | yet. In fact, in the case of a SunOS4 executable being run on | |
07cd4b97 | 2131 | Solaris, we can't get it yet. current_sos will get it when it needs |
c906108c SS |
2132 | it. */ |
2133 | #if !(defined (SVR4_SHARED_LIBS) && defined (BKPT_AT_SYMBOL)) | |
2134 | if ((debug_base = locate_base ()) == 0) | |
2135 | { | |
2136 | /* Can't find the symbol or the executable is statically linked. */ | |
2137 | return; | |
2138 | } | |
2139 | #endif | |
2140 | ||
2141 | if (!enable_break ()) | |
2142 | { | |
2143 | warning ("shared library handler failed to enable breakpoint"); | |
2144 | return; | |
2145 | } | |
2146 | ||
2147 | #if !defined(SVR4_SHARED_LIBS) || defined(_SCO_DS) | |
2148 | /* SCO and SunOS need the loop below, other systems should be using the | |
2149 | special shared library breakpoints and the shared library breakpoint | |
2150 | service routine. | |
2151 | ||
2152 | Now run the target. It will eventually hit the breakpoint, at | |
2153 | which point all of the libraries will have been mapped in and we | |
2154 | can go groveling around in the dynamic linker structures to find | |
2155 | out what we need to know about them. */ | |
2156 | ||
2157 | clear_proceed_status (); | |
2158 | stop_soon_quietly = 1; | |
2159 | stop_signal = TARGET_SIGNAL_0; | |
2160 | do | |
2161 | { | |
2162 | target_resume (-1, 0, stop_signal); | |
2163 | wait_for_inferior (); | |
2164 | } | |
2165 | while (stop_signal != TARGET_SIGNAL_TRAP); | |
2166 | stop_soon_quietly = 0; | |
2167 | ||
2168 | #if !defined(_SCO_DS) | |
2169 | /* We are now either at the "mapping complete" breakpoint (or somewhere | |
2170 | else, a condition we aren't prepared to deal with anyway), so adjust | |
2171 | the PC as necessary after a breakpoint, disable the breakpoint, and | |
2172 | add any shared libraries that were mapped in. */ | |
2173 | ||
2174 | if (DECR_PC_AFTER_BREAK) | |
2175 | { | |
2176 | stop_pc -= DECR_PC_AFTER_BREAK; | |
2177 | write_register (PC_REGNUM, stop_pc); | |
2178 | } | |
2179 | ||
2180 | if (!disable_break ()) | |
2181 | { | |
2182 | warning ("shared library handler failed to disable breakpoint"); | |
2183 | } | |
2184 | ||
2185 | if (auto_solib_add) | |
2186 | solib_add ((char *) 0, 0, (struct target_ops *) 0); | |
2187 | #endif /* ! _SCO_DS */ | |
2188 | #endif | |
2189 | } | |
2190 | ||
2191 | /* | |
2192 | ||
c5aa993b | 2193 | LOCAL FUNCTION |
c906108c | 2194 | |
c5aa993b | 2195 | special_symbol_handling -- additional shared library symbol handling |
c906108c | 2196 | |
c5aa993b | 2197 | SYNOPSIS |
c906108c | 2198 | |
07cd4b97 | 2199 | void special_symbol_handling () |
c906108c | 2200 | |
c5aa993b | 2201 | DESCRIPTION |
c906108c | 2202 | |
c5aa993b JM |
2203 | Once the symbols from a shared object have been loaded in the usual |
2204 | way, we are called to do any system specific symbol handling that | |
2205 | is needed. | |
c906108c | 2206 | |
c5aa993b JM |
2207 | For SunOS4, this consists of grunging around in the dynamic |
2208 | linkers structures to find symbol definitions for "common" symbols | |
2209 | and adding them to the minimal symbol table for the runtime common | |
2210 | objfile. | |
c906108c | 2211 | |
c5aa993b | 2212 | */ |
c906108c SS |
2213 | |
2214 | static void | |
fba45db2 | 2215 | special_symbol_handling (void) |
c906108c SS |
2216 | { |
2217 | #ifndef SVR4_SHARED_LIBS | |
2218 | int j; | |
2219 | ||
2220 | if (debug_addr == 0) | |
2221 | { | |
2222 | /* Get link_dynamic structure */ | |
2223 | ||
2224 | j = target_read_memory (debug_base, (char *) &dynamic_copy, | |
2225 | sizeof (dynamic_copy)); | |
2226 | if (j) | |
2227 | { | |
2228 | /* unreadable */ | |
2229 | return; | |
2230 | } | |
2231 | ||
2232 | /* Calc address of debugger interface structure */ | |
2233 | /* FIXME, this needs work for cross-debugging of core files | |
c5aa993b | 2234 | (byteorder, size, alignment, etc). */ |
c906108c | 2235 | |
07cd4b97 | 2236 | debug_addr = SOLIB_EXTRACT_ADDRESS (dynamic_copy.ldd); |
c906108c SS |
2237 | } |
2238 | ||
2239 | /* Read the debugger structure from the inferior, just to make sure | |
2240 | we have a current copy. */ | |
2241 | ||
2242 | j = target_read_memory (debug_addr, (char *) &debug_copy, | |
2243 | sizeof (debug_copy)); | |
2244 | if (j) | |
c5aa993b | 2245 | return; /* unreadable */ |
c906108c SS |
2246 | |
2247 | /* Get common symbol definitions for the loaded object. */ | |
2248 | ||
2249 | if (debug_copy.ldd_cp) | |
2250 | { | |
07cd4b97 | 2251 | solib_add_common_symbols (SOLIB_EXTRACT_ADDRESS (debug_copy.ldd_cp)); |
c906108c SS |
2252 | } |
2253 | ||
c5aa993b | 2254 | #endif /* !SVR4_SHARED_LIBS */ |
c906108c SS |
2255 | } |
2256 | ||
2257 | ||
2258 | /* | |
2259 | ||
c5aa993b | 2260 | LOCAL FUNCTION |
c906108c | 2261 | |
c5aa993b | 2262 | sharedlibrary_command -- handle command to explicitly add library |
c906108c | 2263 | |
c5aa993b | 2264 | SYNOPSIS |
c906108c | 2265 | |
c5aa993b | 2266 | static void sharedlibrary_command (char *args, int from_tty) |
c906108c | 2267 | |
c5aa993b | 2268 | DESCRIPTION |
c906108c | 2269 | |
c5aa993b | 2270 | */ |
c906108c SS |
2271 | |
2272 | static void | |
fba45db2 | 2273 | sharedlibrary_command (char *args, int from_tty) |
c906108c SS |
2274 | { |
2275 | dont_repeat (); | |
2276 | solib_add (args, from_tty, (struct target_ops *) 0); | |
2277 | } | |
2278 | ||
2279 | #endif /* HAVE_LINK_H */ | |
2280 | ||
2281 | void | |
fba45db2 | 2282 | _initialize_solib (void) |
c906108c SS |
2283 | { |
2284 | #ifdef HAVE_LINK_H | |
2285 | ||
2286 | add_com ("sharedlibrary", class_files, sharedlibrary_command, | |
2287 | "Load shared object library symbols for files matching REGEXP."); | |
c5aa993b | 2288 | add_info ("sharedlibrary", info_sharedlibrary_command, |
c906108c SS |
2289 | "Status of loaded shared object libraries."); |
2290 | ||
2291 | add_show_from_set | |
2292 | (add_set_cmd ("auto-solib-add", class_support, var_zinteger, | |
2293 | (char *) &auto_solib_add, | |
2294 | "Set autoloading of shared library symbols.\n\ | |
2295 | If nonzero, symbols from all shared object libraries will be loaded\n\ | |
2296 | automatically when the inferior begins execution or when the dynamic linker\n\ | |
2297 | informs gdb that a new library has been loaded. Otherwise, symbols\n\ | |
2298 | must be loaded manually, using `sharedlibrary'.", | |
2299 | &setlist), | |
2300 | &showlist); | |
2301 | ||
2302 | add_show_from_set | |
2303 | (add_set_cmd ("solib-absolute-prefix", class_support, var_filename, | |
2304 | (char *) &solib_absolute_prefix, | |
2305 | "Set prefix for loading absolute shared library symbol files.\n\ | |
2306 | For other (relative) files, you can add values using `set solib-search-path'.", | |
2307 | &setlist), | |
2308 | &showlist); | |
2309 | add_show_from_set | |
2310 | (add_set_cmd ("solib-search-path", class_support, var_string, | |
2311 | (char *) &solib_search_path, | |
2312 | "Set the search path for loading non-absolute shared library symbol files.\n\ | |
2313 | This takes precedence over the environment variables PATH and LD_LIBRARY_PATH.", | |
2314 | &setlist), | |
2315 | &showlist); | |
2316 | ||
2317 | #endif /* HAVE_LINK_H */ | |
2318 | } |