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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> | |
34 | #include <unistd.h> | |
35 | ||
36 | #ifndef SVR4_SHARED_LIBS | |
37 | /* SunOS shared libs need the nlist structure. */ | |
c5aa993b | 38 | #include <a.out.h> |
c906108c SS |
39 | #else |
40 | #include "elf/external.h" | |
41 | #endif | |
42 | ||
43 | #include <link.h> | |
44 | ||
45 | #include "symtab.h" | |
46 | #include "bfd.h" | |
47 | #include "symfile.h" | |
48 | #include "objfiles.h" | |
49 | #include "gdbcore.h" | |
50 | #include "command.h" | |
51 | #include "target.h" | |
52 | #include "frame.h" | |
53 | #include "gnu-regex.h" | |
54 | #include "inferior.h" | |
55 | #include "environ.h" | |
56 | #include "language.h" | |
57 | #include "gdbcmd.h" | |
58 | ||
c5aa993b | 59 | #define MAX_PATH_SIZE 512 /* FIXME: Should be dynamic */ |
c906108c SS |
60 | |
61 | /* On SVR4 systems, a list of symbols in the dynamic linker where | |
62 | GDB can try to place a breakpoint to monitor shared library | |
63 | events. | |
64 | ||
65 | If none of these symbols are found, or other errors occur, then | |
66 | SVR4 systems will fall back to using a symbol as the "startup | |
67 | mapping complete" breakpoint address. */ | |
68 | ||
69 | #ifdef SVR4_SHARED_LIBS | |
c5aa993b JM |
70 | static char *solib_break_names[] = |
71 | { | |
c906108c SS |
72 | "r_debug_state", |
73 | "_r_debug_state", | |
74 | "_dl_debug_state", | |
75 | "rtld_db_dlactivity", | |
76 | NULL | |
77 | }; | |
78 | #endif | |
79 | ||
80 | #define BKPT_AT_SYMBOL 1 | |
81 | ||
82 | #if defined (BKPT_AT_SYMBOL) && defined (SVR4_SHARED_LIBS) | |
c5aa993b JM |
83 | static char *bkpt_names[] = |
84 | { | |
c906108c SS |
85 | #ifdef SOLIB_BKPT_NAME |
86 | SOLIB_BKPT_NAME, /* Prefer configured name if it exists. */ | |
87 | #endif | |
88 | "_start", | |
89 | "main", | |
90 | NULL | |
91 | }; | |
92 | #endif | |
93 | ||
94 | /* Symbols which are used to locate the base of the link map structures. */ | |
95 | ||
96 | #ifndef SVR4_SHARED_LIBS | |
c5aa993b JM |
97 | static char *debug_base_symbols[] = |
98 | { | |
c906108c SS |
99 | "_DYNAMIC", |
100 | "_DYNAMIC__MGC", | |
101 | NULL | |
102 | }; | |
103 | #endif | |
104 | ||
c5aa993b JM |
105 | static char *main_name_list[] = |
106 | { | |
c906108c SS |
107 | "main_$main", |
108 | NULL | |
109 | }; | |
110 | ||
111 | /* local data declarations */ | |
112 | ||
113 | #ifndef SVR4_SHARED_LIBS | |
114 | ||
115 | #define LM_ADDR(so) ((so) -> lm.lm_addr) | |
116 | #define LM_NEXT(so) ((so) -> lm.lm_next) | |
117 | #define LM_NAME(so) ((so) -> lm.lm_name) | |
118 | /* Test for first link map entry; first entry is a shared library. */ | |
119 | #define IGNORE_FIRST_LINK_MAP_ENTRY(x) (0) | |
120 | static struct link_dynamic dynamic_copy; | |
121 | static struct link_dynamic_2 ld_2_copy; | |
122 | static struct ld_debug debug_copy; | |
123 | static CORE_ADDR debug_addr; | |
124 | static CORE_ADDR flag_addr; | |
125 | ||
c5aa993b | 126 | #else /* SVR4_SHARED_LIBS */ |
c906108c SS |
127 | |
128 | #define LM_ADDR(so) ((so) -> lm.l_addr) | |
129 | #define LM_NEXT(so) ((so) -> lm.l_next) | |
130 | #define LM_NAME(so) ((so) -> lm.l_name) | |
131 | /* Test for first link map entry; first entry is the exec-file. */ | |
132 | #define IGNORE_FIRST_LINK_MAP_ENTRY(x) ((x).l_prev == NULL) | |
133 | static struct r_debug debug_copy; | |
134 | char shadow_contents[BREAKPOINT_MAX]; /* Stash old bkpt addr contents */ | |
135 | ||
c5aa993b JM |
136 | #endif /* !SVR4_SHARED_LIBS */ |
137 | ||
138 | struct so_list | |
139 | { | |
140 | struct so_list *next; /* next structure in linked list */ | |
141 | struct link_map lm; /* copy of link map from inferior */ | |
142 | struct link_map *lmaddr; /* addr in inferior lm was read from */ | |
143 | CORE_ADDR lmend; /* upper addr bound of mapped object */ | |
144 | char so_name[MAX_PATH_SIZE]; /* shared object lib name (FIXME) */ | |
145 | char symbols_loaded; /* flag: symbols read in yet? */ | |
146 | char from_tty; /* flag: print msgs? */ | |
147 | struct objfile *objfile; /* objfile for loaded lib */ | |
148 | struct section_table *sections; | |
149 | struct section_table *sections_end; | |
150 | struct section_table *textsection; | |
151 | bfd *abfd; | |
152 | }; | |
c906108c SS |
153 | |
154 | static struct so_list *so_list_head; /* List of known shared objects */ | |
c5aa993b | 155 | static CORE_ADDR debug_base; /* Base of dynamic linker structures */ |
c906108c SS |
156 | static CORE_ADDR breakpoint_addr; /* Address where end bkpt is set */ |
157 | ||
c5aa993b | 158 | static int solib_cleanup_queued = 0; /* make_run_cleanup called */ |
c906108c SS |
159 | |
160 | extern int | |
c5aa993b | 161 | fdmatch PARAMS ((int, int)); /* In libiberty */ |
c906108c SS |
162 | |
163 | /* Local function prototypes */ | |
164 | ||
165 | static void | |
166 | do_clear_solib PARAMS ((PTR)); | |
167 | ||
168 | static int | |
169 | match_main PARAMS ((char *)); | |
170 | ||
171 | static void | |
172 | special_symbol_handling PARAMS ((struct so_list *)); | |
173 | ||
174 | static void | |
175 | sharedlibrary_command PARAMS ((char *, int)); | |
176 | ||
177 | static int | |
178 | enable_break PARAMS ((void)); | |
179 | ||
180 | static void | |
181 | info_sharedlibrary_command PARAMS ((char *, int)); | |
182 | ||
183 | static int symbol_add_stub PARAMS ((PTR)); | |
184 | ||
185 | static struct so_list * | |
c5aa993b | 186 | find_solib PARAMS ((struct so_list *)); |
c906108c SS |
187 | |
188 | static struct link_map * | |
c5aa993b | 189 | first_link_map_member PARAMS ((void)); |
c906108c SS |
190 | |
191 | static CORE_ADDR | |
c5aa993b | 192 | locate_base PARAMS ((void)); |
c906108c SS |
193 | |
194 | static int solib_map_sections PARAMS ((PTR)); | |
195 | ||
196 | #ifdef SVR4_SHARED_LIBS | |
197 | ||
198 | static CORE_ADDR | |
c5aa993b | 199 | elf_locate_base PARAMS ((void)); |
c906108c SS |
200 | |
201 | #else | |
202 | ||
203 | static int | |
204 | disable_break PARAMS ((void)); | |
205 | ||
206 | static void | |
207 | allocate_rt_common_objfile PARAMS ((void)); | |
208 | ||
209 | static void | |
210 | solib_add_common_symbols PARAMS ((struct rtc_symb *)); | |
211 | ||
212 | #endif | |
213 | ||
214 | void _initialize_solib PARAMS ((void)); | |
215 | ||
216 | /* If non-zero, this is a prefix that will be added to the front of the name | |
217 | shared libraries with an absolute filename for loading. */ | |
218 | static char *solib_absolute_prefix = NULL; | |
219 | ||
220 | /* If non-empty, this is a search path for loading non-absolute shared library | |
221 | symbol files. This takes precedence over the environment variables PATH | |
222 | and LD_LIBRARY_PATH. */ | |
223 | static char *solib_search_path = NULL; | |
224 | ||
225 | /* | |
226 | ||
c5aa993b | 227 | LOCAL FUNCTION |
c906108c | 228 | |
c5aa993b | 229 | solib_map_sections -- open bfd and build sections for shared lib |
c906108c | 230 | |
c5aa993b | 231 | SYNOPSIS |
c906108c | 232 | |
c5aa993b | 233 | static int solib_map_sections (struct so_list *so) |
c906108c | 234 | |
c5aa993b | 235 | DESCRIPTION |
c906108c | 236 | |
c5aa993b JM |
237 | Given a pointer to one of the shared objects in our list |
238 | of mapped objects, use the recorded name to open a bfd | |
239 | descriptor for the object, build a section table, and then | |
240 | relocate all the section addresses by the base address at | |
241 | which the shared object was mapped. | |
c906108c | 242 | |
c5aa993b | 243 | FIXMES |
c906108c | 244 | |
c5aa993b JM |
245 | In most (all?) cases the shared object file name recorded in the |
246 | dynamic linkage tables will be a fully qualified pathname. For | |
247 | cases where it isn't, do we really mimic the systems search | |
248 | mechanism correctly in the below code (particularly the tilde | |
249 | expansion stuff?). | |
c906108c SS |
250 | */ |
251 | ||
252 | static int | |
253 | solib_map_sections (arg) | |
254 | PTR arg; | |
255 | { | |
256 | struct so_list *so = (struct so_list *) arg; /* catch_errors bogon */ | |
257 | char *filename; | |
258 | char *scratch_pathname; | |
259 | int scratch_chan; | |
260 | struct section_table *p; | |
261 | struct cleanup *old_chain; | |
262 | bfd *abfd; | |
c5aa993b JM |
263 | |
264 | filename = tilde_expand (so->so_name); | |
265 | ||
c906108c SS |
266 | if (solib_absolute_prefix && ROOTED_P (filename)) |
267 | /* Prefix shared libraries with absolute filenames with | |
268 | SOLIB_ABSOLUTE_PREFIX. */ | |
269 | { | |
270 | char *pfxed_fn; | |
271 | int pfx_len; | |
272 | ||
273 | pfx_len = strlen (solib_absolute_prefix); | |
274 | ||
275 | /* Remove trailing slashes. */ | |
276 | while (pfx_len > 0 && SLASH_P (solib_absolute_prefix[pfx_len - 1])) | |
277 | pfx_len--; | |
278 | ||
279 | pfxed_fn = xmalloc (pfx_len + strlen (filename) + 1); | |
280 | strcpy (pfxed_fn, solib_absolute_prefix); | |
281 | strcat (pfxed_fn, filename); | |
282 | free (filename); | |
283 | ||
284 | filename = pfxed_fn; | |
285 | } | |
286 | ||
287 | old_chain = make_cleanup (free, filename); | |
288 | ||
289 | scratch_chan = -1; | |
290 | ||
291 | if (solib_search_path) | |
292 | scratch_chan = openp (solib_search_path, | |
293 | 1, filename, O_RDONLY, 0, &scratch_pathname); | |
294 | if (scratch_chan < 0) | |
c5aa993b | 295 | scratch_chan = openp (get_in_environ (inferior_environ, "PATH"), |
c906108c SS |
296 | 1, filename, O_RDONLY, 0, &scratch_pathname); |
297 | if (scratch_chan < 0) | |
298 | { | |
c5aa993b JM |
299 | scratch_chan = openp (get_in_environ |
300 | (inferior_environ, "LD_LIBRARY_PATH"), | |
c906108c SS |
301 | 1, filename, O_RDONLY, 0, &scratch_pathname); |
302 | } | |
303 | if (scratch_chan < 0) | |
304 | { | |
305 | perror_with_name (filename); | |
306 | } | |
307 | /* Leave scratch_pathname allocated. abfd->name will point to it. */ | |
308 | ||
309 | abfd = bfd_fdopenr (scratch_pathname, gnutarget, scratch_chan); | |
310 | if (!abfd) | |
311 | { | |
312 | close (scratch_chan); | |
313 | error ("Could not open `%s' as an executable file: %s", | |
314 | scratch_pathname, bfd_errmsg (bfd_get_error ())); | |
315 | } | |
316 | /* Leave bfd open, core_xfer_memory and "info files" need it. */ | |
c5aa993b JM |
317 | so->abfd = abfd; |
318 | abfd->cacheable = true; | |
c906108c SS |
319 | |
320 | /* copy full path name into so_name, so that later symbol_file_add can find | |
321 | it */ | |
322 | if (strlen (scratch_pathname) >= MAX_PATH_SIZE) | |
323 | error ("Full path name length of shared library exceeds MAX_PATH_SIZE in so_list structure."); | |
324 | strcpy (so->so_name, scratch_pathname); | |
325 | ||
326 | if (!bfd_check_format (abfd, bfd_object)) | |
327 | { | |
328 | error ("\"%s\": not in executable format: %s.", | |
329 | scratch_pathname, bfd_errmsg (bfd_get_error ())); | |
330 | } | |
c5aa993b | 331 | if (build_section_table (abfd, &so->sections, &so->sections_end)) |
c906108c | 332 | { |
c5aa993b | 333 | error ("Can't find the file sections in `%s': %s", |
c906108c SS |
334 | bfd_get_filename (abfd), bfd_errmsg (bfd_get_error ())); |
335 | } | |
336 | ||
c5aa993b | 337 | for (p = so->sections; p < so->sections_end; p++) |
c906108c SS |
338 | { |
339 | /* Relocate the section binding addresses as recorded in the shared | |
c5aa993b JM |
340 | object's file by the base address to which the object was actually |
341 | mapped. */ | |
342 | p->addr += (CORE_ADDR) LM_ADDR (so); | |
343 | p->endaddr += (CORE_ADDR) LM_ADDR (so); | |
344 | so->lmend = (CORE_ADDR) max (p->endaddr, so->lmend); | |
345 | if (STREQ (p->the_bfd_section->name, ".text")) | |
c906108c | 346 | { |
c5aa993b | 347 | so->textsection = p; |
c906108c SS |
348 | } |
349 | } | |
350 | ||
351 | /* Free the file names, close the file now. */ | |
352 | do_cleanups (old_chain); | |
353 | ||
354 | return (1); | |
355 | } | |
356 | ||
357 | #ifndef SVR4_SHARED_LIBS | |
358 | ||
359 | /* Allocate the runtime common object file. */ | |
360 | ||
361 | static void | |
362 | allocate_rt_common_objfile () | |
363 | { | |
364 | struct objfile *objfile; | |
365 | struct objfile *last_one; | |
366 | ||
367 | objfile = (struct objfile *) xmalloc (sizeof (struct objfile)); | |
368 | memset (objfile, 0, sizeof (struct objfile)); | |
c5aa993b JM |
369 | objfile->md = NULL; |
370 | obstack_specify_allocation (&objfile->psymbol_cache.cache, 0, 0, | |
c906108c | 371 | xmalloc, free); |
c5aa993b | 372 | obstack_specify_allocation (&objfile->psymbol_obstack, 0, 0, xmalloc, |
c906108c | 373 | free); |
c5aa993b | 374 | obstack_specify_allocation (&objfile->symbol_obstack, 0, 0, xmalloc, |
c906108c | 375 | free); |
c5aa993b | 376 | obstack_specify_allocation (&objfile->type_obstack, 0, 0, xmalloc, |
c906108c | 377 | free); |
c5aa993b | 378 | objfile->name = mstrsave (objfile->md, "rt_common"); |
c906108c SS |
379 | |
380 | /* Add this file onto the tail of the linked list of other such files. */ | |
381 | ||
c5aa993b | 382 | objfile->next = NULL; |
c906108c SS |
383 | if (object_files == NULL) |
384 | object_files = objfile; | |
385 | else | |
386 | { | |
387 | for (last_one = object_files; | |
c5aa993b JM |
388 | last_one->next; |
389 | last_one = last_one->next); | |
390 | last_one->next = objfile; | |
c906108c SS |
391 | } |
392 | ||
393 | rt_common_objfile = objfile; | |
394 | } | |
395 | ||
396 | /* Read all dynamically loaded common symbol definitions from the inferior | |
397 | and put them into the minimal symbol table for the runtime common | |
398 | objfile. */ | |
399 | ||
400 | static void | |
401 | solib_add_common_symbols (rtc_symp) | |
c5aa993b | 402 | struct rtc_symb *rtc_symp; |
c906108c SS |
403 | { |
404 | struct rtc_symb inferior_rtc_symb; | |
405 | struct nlist inferior_rtc_nlist; | |
406 | int len; | |
407 | char *name; | |
408 | ||
409 | /* Remove any runtime common symbols from previous runs. */ | |
410 | ||
c5aa993b | 411 | if (rt_common_objfile != NULL && rt_common_objfile->minimal_symbol_count) |
c906108c | 412 | { |
c5aa993b JM |
413 | obstack_free (&rt_common_objfile->symbol_obstack, 0); |
414 | obstack_specify_allocation (&rt_common_objfile->symbol_obstack, 0, 0, | |
c906108c | 415 | xmalloc, free); |
c5aa993b JM |
416 | rt_common_objfile->minimal_symbol_count = 0; |
417 | rt_common_objfile->msymbols = NULL; | |
c906108c SS |
418 | } |
419 | ||
420 | init_minimal_symbol_collection (); | |
421 | make_cleanup ((make_cleanup_func) discard_minimal_symbols, 0); | |
422 | ||
423 | while (rtc_symp) | |
424 | { | |
425 | read_memory ((CORE_ADDR) rtc_symp, | |
426 | (char *) &inferior_rtc_symb, | |
427 | sizeof (inferior_rtc_symb)); | |
428 | read_memory ((CORE_ADDR) inferior_rtc_symb.rtc_sp, | |
429 | (char *) &inferior_rtc_nlist, | |
c5aa993b | 430 | sizeof (inferior_rtc_nlist)); |
c906108c SS |
431 | if (inferior_rtc_nlist.n_type == N_COMM) |
432 | { | |
433 | /* FIXME: The length of the symbol name is not available, but in the | |
434 | current implementation the common symbol is allocated immediately | |
435 | behind the name of the symbol. */ | |
436 | len = inferior_rtc_nlist.n_value - inferior_rtc_nlist.n_un.n_strx; | |
437 | ||
438 | name = xmalloc (len); | |
439 | read_memory ((CORE_ADDR) inferior_rtc_nlist.n_un.n_name, name, len); | |
440 | ||
441 | /* Allocate the runtime common objfile if necessary. */ | |
442 | if (rt_common_objfile == NULL) | |
443 | allocate_rt_common_objfile (); | |
444 | ||
445 | prim_record_minimal_symbol (name, inferior_rtc_nlist.n_value, | |
446 | mst_bss, rt_common_objfile); | |
447 | free (name); | |
448 | } | |
449 | rtc_symp = inferior_rtc_symb.rtc_next; | |
450 | } | |
451 | ||
452 | /* Install any minimal symbols that have been collected as the current | |
453 | minimal symbols for the runtime common objfile. */ | |
454 | ||
455 | install_minimal_symbols (rt_common_objfile); | |
456 | } | |
457 | ||
c5aa993b | 458 | #endif /* SVR4_SHARED_LIBS */ |
c906108c SS |
459 | |
460 | ||
461 | #ifdef SVR4_SHARED_LIBS | |
462 | ||
463 | static CORE_ADDR | |
c5aa993b | 464 | bfd_lookup_symbol PARAMS ((bfd *, char *)); |
c906108c SS |
465 | |
466 | /* | |
467 | ||
c5aa993b | 468 | LOCAL FUNCTION |
c906108c | 469 | |
c5aa993b | 470 | bfd_lookup_symbol -- lookup the value for a specific symbol |
c906108c | 471 | |
c5aa993b | 472 | SYNOPSIS |
c906108c | 473 | |
c5aa993b | 474 | CORE_ADDR bfd_lookup_symbol (bfd *abfd, char *symname) |
c906108c | 475 | |
c5aa993b | 476 | DESCRIPTION |
c906108c | 477 | |
c5aa993b JM |
478 | An expensive way to lookup the value of a single symbol for |
479 | bfd's that are only temporary anyway. This is used by the | |
480 | shared library support to find the address of the debugger | |
481 | interface structures in the shared library. | |
c906108c | 482 | |
c5aa993b JM |
483 | Note that 0 is specifically allowed as an error return (no |
484 | such symbol). | |
485 | */ | |
c906108c SS |
486 | |
487 | static CORE_ADDR | |
488 | bfd_lookup_symbol (abfd, symname) | |
489 | bfd *abfd; | |
490 | char *symname; | |
491 | { | |
492 | unsigned int storage_needed; | |
493 | asymbol *sym; | |
494 | asymbol **symbol_table; | |
495 | unsigned int number_of_symbols; | |
496 | unsigned int i; | |
497 | struct cleanup *back_to; | |
498 | CORE_ADDR symaddr = 0; | |
c5aa993b | 499 | |
c906108c SS |
500 | storage_needed = bfd_get_symtab_upper_bound (abfd); |
501 | ||
502 | if (storage_needed > 0) | |
503 | { | |
504 | symbol_table = (asymbol **) xmalloc (storage_needed); | |
c5aa993b JM |
505 | back_to = make_cleanup (free, (PTR) symbol_table); |
506 | number_of_symbols = bfd_canonicalize_symtab (abfd, symbol_table); | |
507 | ||
c906108c SS |
508 | for (i = 0; i < number_of_symbols; i++) |
509 | { | |
510 | sym = *symbol_table++; | |
c5aa993b | 511 | if (STREQ (sym->name, symname)) |
c906108c SS |
512 | { |
513 | /* Bfd symbols are section relative. */ | |
c5aa993b | 514 | symaddr = sym->value + sym->section->vma; |
c906108c SS |
515 | break; |
516 | } | |
517 | } | |
518 | do_cleanups (back_to); | |
519 | } | |
520 | return (symaddr); | |
521 | } | |
522 | ||
523 | #ifdef HANDLE_SVR4_EXEC_EMULATORS | |
524 | ||
525 | /* | |
c5aa993b JM |
526 | Solaris BCP (the part of Solaris which allows it to run SunOS4 |
527 | a.out files) throws in another wrinkle. Solaris does not fill | |
528 | in the usual a.out link map structures when running BCP programs, | |
529 | the only way to get at them is via groping around in the dynamic | |
530 | linker. | |
531 | The dynamic linker and it's structures are located in the shared | |
532 | C library, which gets run as the executable's "interpreter" by | |
533 | the kernel. | |
534 | ||
535 | Note that we can assume nothing about the process state at the time | |
536 | we need to find these structures. We may be stopped on the first | |
537 | instruction of the interpreter (C shared library), the first | |
538 | instruction of the executable itself, or somewhere else entirely | |
539 | (if we attached to the process for example). | |
540 | */ | |
541 | ||
542 | static char *debug_base_symbols[] = | |
543 | { | |
544 | "r_debug", /* Solaris 2.3 */ | |
545 | "_r_debug", /* Solaris 2.1, 2.2 */ | |
c906108c SS |
546 | NULL |
547 | }; | |
548 | ||
549 | static int | |
550 | look_for_base PARAMS ((int, CORE_ADDR)); | |
551 | ||
552 | /* | |
553 | ||
c5aa993b | 554 | LOCAL FUNCTION |
c906108c | 555 | |
c5aa993b | 556 | look_for_base -- examine file for each mapped address segment |
c906108c | 557 | |
c5aa993b | 558 | SYNOPSYS |
c906108c | 559 | |
c5aa993b | 560 | static int look_for_base (int fd, CORE_ADDR baseaddr) |
c906108c | 561 | |
c5aa993b | 562 | DESCRIPTION |
c906108c | 563 | |
c5aa993b JM |
564 | This function is passed to proc_iterate_over_mappings, which |
565 | causes it to get called once for each mapped address space, with | |
566 | an open file descriptor for the file mapped to that space, and the | |
567 | base address of that mapped space. | |
c906108c | 568 | |
c5aa993b JM |
569 | Our job is to find the debug base symbol in the file that this |
570 | fd is open on, if it exists, and if so, initialize the dynamic | |
571 | linker structure base address debug_base. | |
c906108c | 572 | |
c5aa993b JM |
573 | Note that this is a computationally expensive proposition, since |
574 | we basically have to open a bfd on every call, so we specifically | |
575 | avoid opening the exec file. | |
c906108c SS |
576 | */ |
577 | ||
578 | static int | |
579 | look_for_base (fd, baseaddr) | |
580 | int fd; | |
581 | CORE_ADDR baseaddr; | |
582 | { | |
583 | bfd *interp_bfd; | |
584 | CORE_ADDR address = 0; | |
585 | char **symbolp; | |
586 | ||
587 | /* If the fd is -1, then there is no file that corresponds to this | |
588 | mapped memory segment, so skip it. Also, if the fd corresponds | |
589 | to the exec file, skip it as well. */ | |
590 | ||
591 | if (fd == -1 | |
592 | || (exec_bfd != NULL | |
c5aa993b | 593 | && fdmatch (fileno ((FILE *) (exec_bfd->iostream)), fd))) |
c906108c SS |
594 | { |
595 | return (0); | |
596 | } | |
597 | ||
598 | /* Try to open whatever random file this fd corresponds to. Note that | |
599 | we have no way currently to find the filename. Don't gripe about | |
600 | any problems we might have, just fail. */ | |
601 | ||
602 | if ((interp_bfd = bfd_fdopenr ("unnamed", gnutarget, fd)) == NULL) | |
603 | { | |
604 | return (0); | |
605 | } | |
606 | if (!bfd_check_format (interp_bfd, bfd_object)) | |
607 | { | |
608 | /* FIXME-leak: on failure, might not free all memory associated with | |
c5aa993b | 609 | interp_bfd. */ |
c906108c SS |
610 | bfd_close (interp_bfd); |
611 | return (0); | |
612 | } | |
613 | ||
614 | /* Now try to find our debug base symbol in this file, which we at | |
615 | least know to be a valid ELF executable or shared library. */ | |
616 | ||
617 | for (symbolp = debug_base_symbols; *symbolp != NULL; symbolp++) | |
618 | { | |
619 | address = bfd_lookup_symbol (interp_bfd, *symbolp); | |
620 | if (address != 0) | |
621 | { | |
622 | break; | |
623 | } | |
624 | } | |
625 | if (address == 0) | |
626 | { | |
627 | /* FIXME-leak: on failure, might not free all memory associated with | |
c5aa993b | 628 | interp_bfd. */ |
c906108c SS |
629 | bfd_close (interp_bfd); |
630 | return (0); | |
631 | } | |
632 | ||
633 | /* Eureka! We found the symbol. But now we may need to relocate it | |
634 | by the base address. If the symbol's value is less than the base | |
635 | address of the shared library, then it hasn't yet been relocated | |
636 | by the dynamic linker, and we have to do it ourself. FIXME: Note | |
637 | that we make the assumption that the first segment that corresponds | |
638 | to the shared library has the base address to which the library | |
639 | was relocated. */ | |
640 | ||
641 | if (address < baseaddr) | |
642 | { | |
643 | address += baseaddr; | |
644 | } | |
645 | debug_base = address; | |
646 | /* FIXME-leak: on failure, might not free all memory associated with | |
647 | interp_bfd. */ | |
648 | bfd_close (interp_bfd); | |
649 | return (1); | |
650 | } | |
651 | #endif /* HANDLE_SVR4_EXEC_EMULATORS */ | |
652 | ||
653 | /* | |
654 | ||
c5aa993b | 655 | LOCAL FUNCTION |
c906108c | 656 | |
c5aa993b JM |
657 | elf_locate_base -- locate the base address of dynamic linker structs |
658 | for SVR4 elf targets. | |
c906108c | 659 | |
c5aa993b | 660 | SYNOPSIS |
c906108c | 661 | |
c5aa993b | 662 | CORE_ADDR elf_locate_base (void) |
c906108c | 663 | |
c5aa993b | 664 | DESCRIPTION |
c906108c | 665 | |
c5aa993b JM |
666 | For SVR4 elf targets the address of the dynamic linker's runtime |
667 | structure is contained within the dynamic info section in the | |
668 | executable file. The dynamic section is also mapped into the | |
669 | inferior address space. Because the runtime loader fills in the | |
670 | real address before starting the inferior, we have to read in the | |
671 | dynamic info section from the inferior address space. | |
672 | If there are any errors while trying to find the address, we | |
673 | silently return 0, otherwise the found address is returned. | |
c906108c SS |
674 | |
675 | */ | |
676 | ||
677 | static CORE_ADDR | |
678 | elf_locate_base () | |
679 | { | |
680 | sec_ptr dyninfo_sect; | |
681 | int dyninfo_sect_size; | |
682 | CORE_ADDR dyninfo_addr; | |
683 | char *buf; | |
684 | char *bufend; | |
685 | ||
686 | /* Find the start address of the .dynamic section. */ | |
687 | dyninfo_sect = bfd_get_section_by_name (exec_bfd, ".dynamic"); | |
688 | if (dyninfo_sect == NULL) | |
689 | return 0; | |
690 | dyninfo_addr = bfd_section_vma (exec_bfd, dyninfo_sect); | |
691 | ||
692 | /* Read in .dynamic section, silently ignore errors. */ | |
693 | dyninfo_sect_size = bfd_section_size (exec_bfd, dyninfo_sect); | |
694 | buf = alloca (dyninfo_sect_size); | |
695 | if (target_read_memory (dyninfo_addr, buf, dyninfo_sect_size)) | |
696 | return 0; | |
697 | ||
698 | /* Find the DT_DEBUG entry in the the .dynamic section. | |
699 | For mips elf we look for DT_MIPS_RLD_MAP, mips elf apparently has | |
700 | no DT_DEBUG entries. */ | |
701 | #ifndef TARGET_ELF64 | |
702 | for (bufend = buf + dyninfo_sect_size; | |
703 | buf < bufend; | |
704 | buf += sizeof (Elf32_External_Dyn)) | |
705 | { | |
c5aa993b | 706 | Elf32_External_Dyn *x_dynp = (Elf32_External_Dyn *) buf; |
c906108c SS |
707 | long dyn_tag; |
708 | CORE_ADDR dyn_ptr; | |
709 | ||
710 | dyn_tag = bfd_h_get_32 (exec_bfd, (bfd_byte *) x_dynp->d_tag); | |
711 | if (dyn_tag == DT_NULL) | |
712 | break; | |
713 | else if (dyn_tag == DT_DEBUG) | |
714 | { | |
715 | dyn_ptr = bfd_h_get_32 (exec_bfd, (bfd_byte *) x_dynp->d_un.d_ptr); | |
716 | return dyn_ptr; | |
717 | } | |
718 | #ifdef DT_MIPS_RLD_MAP | |
719 | else if (dyn_tag == DT_MIPS_RLD_MAP) | |
720 | { | |
721 | char pbuf[TARGET_PTR_BIT / HOST_CHAR_BIT]; | |
722 | ||
723 | /* DT_MIPS_RLD_MAP contains a pointer to the address | |
724 | of the dynamic link structure. */ | |
725 | dyn_ptr = bfd_h_get_32 (exec_bfd, (bfd_byte *) x_dynp->d_un.d_ptr); | |
726 | if (target_read_memory (dyn_ptr, pbuf, sizeof (pbuf))) | |
727 | return 0; | |
728 | return extract_unsigned_integer (pbuf, sizeof (pbuf)); | |
729 | } | |
730 | #endif | |
731 | } | |
732 | #else /* ELF64 */ | |
733 | for (bufend = buf + dyninfo_sect_size; | |
734 | buf < bufend; | |
735 | buf += sizeof (Elf64_External_Dyn)) | |
736 | { | |
c5aa993b | 737 | Elf64_External_Dyn *x_dynp = (Elf64_External_Dyn *) buf; |
c906108c SS |
738 | long dyn_tag; |
739 | CORE_ADDR dyn_ptr; | |
740 | ||
741 | dyn_tag = bfd_h_get_64 (exec_bfd, (bfd_byte *) x_dynp->d_tag); | |
742 | if (dyn_tag == DT_NULL) | |
743 | break; | |
744 | else if (dyn_tag == DT_DEBUG) | |
745 | { | |
746 | dyn_ptr = bfd_h_get_64 (exec_bfd, (bfd_byte *) x_dynp->d_un.d_ptr); | |
747 | return dyn_ptr; | |
748 | } | |
749 | } | |
750 | #endif | |
751 | ||
752 | /* DT_DEBUG entry not found. */ | |
753 | return 0; | |
754 | } | |
755 | ||
c5aa993b | 756 | #endif /* SVR4_SHARED_LIBS */ |
c906108c SS |
757 | |
758 | /* | |
759 | ||
c5aa993b | 760 | LOCAL FUNCTION |
c906108c | 761 | |
c5aa993b | 762 | locate_base -- locate the base address of dynamic linker structs |
c906108c | 763 | |
c5aa993b | 764 | SYNOPSIS |
c906108c | 765 | |
c5aa993b | 766 | CORE_ADDR locate_base (void) |
c906108c | 767 | |
c5aa993b | 768 | DESCRIPTION |
c906108c | 769 | |
c5aa993b JM |
770 | For both the SunOS and SVR4 shared library implementations, if the |
771 | inferior executable has been linked dynamically, there is a single | |
772 | address somewhere in the inferior's data space which is the key to | |
773 | locating all of the dynamic linker's runtime structures. This | |
774 | address is the value of the debug base symbol. The job of this | |
775 | function is to find and return that address, or to return 0 if there | |
776 | is no such address (the executable is statically linked for example). | |
c906108c | 777 | |
c5aa993b JM |
778 | For SunOS, the job is almost trivial, since the dynamic linker and |
779 | all of it's structures are statically linked to the executable at | |
780 | link time. Thus the symbol for the address we are looking for has | |
781 | already been added to the minimal symbol table for the executable's | |
782 | objfile at the time the symbol file's symbols were read, and all we | |
783 | have to do is look it up there. Note that we explicitly do NOT want | |
784 | to find the copies in the shared library. | |
c906108c | 785 | |
c5aa993b JM |
786 | The SVR4 version is a bit more complicated because the address |
787 | is contained somewhere in the dynamic info section. We have to go | |
788 | to a lot more work to discover the address of the debug base symbol. | |
789 | Because of this complexity, we cache the value we find and return that | |
790 | value on subsequent invocations. Note there is no copy in the | |
791 | executable symbol tables. | |
c906108c SS |
792 | |
793 | */ | |
794 | ||
795 | static CORE_ADDR | |
796 | locate_base () | |
797 | { | |
798 | ||
799 | #ifndef SVR4_SHARED_LIBS | |
800 | ||
801 | struct minimal_symbol *msymbol; | |
802 | CORE_ADDR address = 0; | |
803 | char **symbolp; | |
804 | ||
805 | /* For SunOS, we want to limit the search for the debug base symbol to the | |
806 | executable being debugged, since there is a duplicate named symbol in the | |
807 | shared library. We don't want the shared library versions. */ | |
808 | ||
809 | for (symbolp = debug_base_symbols; *symbolp != NULL; symbolp++) | |
810 | { | |
811 | msymbol = lookup_minimal_symbol (*symbolp, NULL, symfile_objfile); | |
812 | if ((msymbol != NULL) && (SYMBOL_VALUE_ADDRESS (msymbol) != 0)) | |
813 | { | |
814 | address = SYMBOL_VALUE_ADDRESS (msymbol); | |
815 | return (address); | |
816 | } | |
817 | } | |
818 | return (0); | |
819 | ||
c5aa993b | 820 | #else /* SVR4_SHARED_LIBS */ |
c906108c SS |
821 | |
822 | /* Check to see if we have a currently valid address, and if so, avoid | |
823 | doing all this work again and just return the cached address. If | |
824 | we have no cached address, try to locate it in the dynamic info | |
825 | section for ELF executables. */ | |
826 | ||
827 | if (debug_base == 0) | |
828 | { | |
829 | if (exec_bfd != NULL | |
830 | && bfd_get_flavour (exec_bfd) == bfd_target_elf_flavour) | |
831 | debug_base = elf_locate_base (); | |
832 | #ifdef HANDLE_SVR4_EXEC_EMULATORS | |
833 | /* Try it the hard way for emulated executables. */ | |
834 | else if (inferior_pid != 0 && target_has_execution) | |
835 | proc_iterate_over_mappings (look_for_base); | |
836 | #endif | |
837 | } | |
838 | return (debug_base); | |
839 | ||
c5aa993b | 840 | #endif /* !SVR4_SHARED_LIBS */ |
c906108c SS |
841 | |
842 | } | |
843 | ||
844 | /* | |
845 | ||
c5aa993b | 846 | LOCAL FUNCTION |
c906108c | 847 | |
c5aa993b | 848 | first_link_map_member -- locate first member in dynamic linker's map |
c906108c | 849 | |
c5aa993b | 850 | SYNOPSIS |
c906108c | 851 | |
c5aa993b | 852 | static struct link_map *first_link_map_member (void) |
c906108c | 853 | |
c5aa993b | 854 | DESCRIPTION |
c906108c | 855 | |
c5aa993b JM |
856 | Read in a copy of the first member in the inferior's dynamic |
857 | link map from the inferior's dynamic linker structures, and return | |
858 | a pointer to the copy in our address space. | |
859 | */ | |
c906108c SS |
860 | |
861 | static struct link_map * | |
862 | first_link_map_member () | |
863 | { | |
864 | struct link_map *lm = NULL; | |
865 | ||
866 | #ifndef SVR4_SHARED_LIBS | |
867 | ||
868 | read_memory (debug_base, (char *) &dynamic_copy, sizeof (dynamic_copy)); | |
869 | if (dynamic_copy.ld_version >= 2) | |
870 | { | |
871 | /* It is a version that we can deal with, so read in the secondary | |
c5aa993b | 872 | structure and find the address of the link map list from it. */ |
c906108c SS |
873 | read_memory ((CORE_ADDR) dynamic_copy.ld_un.ld_2, (char *) &ld_2_copy, |
874 | sizeof (struct link_dynamic_2)); | |
875 | lm = ld_2_copy.ld_loaded; | |
876 | } | |
877 | ||
c5aa993b | 878 | #else /* SVR4_SHARED_LIBS */ |
c906108c SS |
879 | |
880 | read_memory (debug_base, (char *) &debug_copy, sizeof (struct r_debug)); | |
881 | /* FIXME: Perhaps we should validate the info somehow, perhaps by | |
882 | checking r_version for a known version number, or r_state for | |
883 | RT_CONSISTENT. */ | |
884 | lm = debug_copy.r_map; | |
885 | ||
c5aa993b | 886 | #endif /* !SVR4_SHARED_LIBS */ |
c906108c SS |
887 | |
888 | return (lm); | |
889 | } | |
890 | ||
891 | /* | |
892 | ||
c5aa993b | 893 | LOCAL FUNCTION |
c906108c | 894 | |
c5aa993b | 895 | find_solib -- step through list of shared objects |
c906108c | 896 | |
c5aa993b | 897 | SYNOPSIS |
c906108c | 898 | |
c5aa993b | 899 | struct so_list *find_solib (struct so_list *so_list_ptr) |
c906108c | 900 | |
c5aa993b | 901 | DESCRIPTION |
c906108c | 902 | |
c5aa993b JM |
903 | This module contains the routine which finds the names of any |
904 | loaded "images" in the current process. The argument in must be | |
905 | NULL on the first call, and then the returned value must be passed | |
906 | in on subsequent calls. This provides the capability to "step" down | |
907 | the list of loaded objects. On the last object, a NULL value is | |
908 | returned. | |
c906108c | 909 | |
c5aa993b JM |
910 | The arg and return value are "struct link_map" pointers, as defined |
911 | in <link.h>. | |
c906108c SS |
912 | */ |
913 | ||
914 | static struct so_list * | |
915 | find_solib (so_list_ptr) | |
916 | struct so_list *so_list_ptr; /* Last lm or NULL for first one */ | |
917 | { | |
918 | struct so_list *so_list_next = NULL; | |
919 | struct link_map *lm = NULL; | |
920 | struct so_list *new; | |
c5aa993b | 921 | |
c906108c SS |
922 | if (so_list_ptr == NULL) |
923 | { | |
924 | /* We are setting up for a new scan through the loaded images. */ | |
925 | if ((so_list_next = so_list_head) == NULL) | |
926 | { | |
927 | /* We have not already read in the dynamic linking structures | |
928 | from the inferior, lookup the address of the base structure. */ | |
929 | debug_base = locate_base (); | |
930 | if (debug_base != 0) | |
931 | { | |
932 | /* Read the base structure in and find the address of the first | |
c5aa993b | 933 | link map list member. */ |
c906108c SS |
934 | lm = first_link_map_member (); |
935 | } | |
936 | } | |
937 | } | |
938 | else | |
939 | { | |
940 | /* We have been called before, and are in the process of walking | |
c5aa993b | 941 | the shared library list. Advance to the next shared object. */ |
c906108c SS |
942 | if ((lm = LM_NEXT (so_list_ptr)) == NULL) |
943 | { | |
944 | /* We have hit the end of the list, so check to see if any were | |
945 | added, but be quiet if we can't read from the target any more. */ | |
c5aa993b JM |
946 | int status = target_read_memory ((CORE_ADDR) so_list_ptr->lmaddr, |
947 | (char *) &(so_list_ptr->lm), | |
c906108c SS |
948 | sizeof (struct link_map)); |
949 | if (status == 0) | |
950 | { | |
951 | lm = LM_NEXT (so_list_ptr); | |
952 | } | |
953 | else | |
954 | { | |
955 | lm = NULL; | |
956 | } | |
957 | } | |
c5aa993b | 958 | so_list_next = so_list_ptr->next; |
c906108c SS |
959 | } |
960 | if ((so_list_next == NULL) && (lm != NULL)) | |
961 | { | |
962 | /* Get next link map structure from inferior image and build a local | |
c5aa993b | 963 | abbreviated load_map structure */ |
c906108c SS |
964 | new = (struct so_list *) xmalloc (sizeof (struct so_list)); |
965 | memset ((char *) new, 0, sizeof (struct so_list)); | |
c5aa993b | 966 | new->lmaddr = lm; |
c906108c | 967 | /* Add the new node as the next node in the list, or as the root |
c5aa993b | 968 | node if this is the first one. */ |
c906108c SS |
969 | if (so_list_ptr != NULL) |
970 | { | |
c5aa993b | 971 | so_list_ptr->next = new; |
c906108c SS |
972 | } |
973 | else | |
974 | { | |
975 | so_list_head = new; | |
976 | ||
c5aa993b | 977 | if (!solib_cleanup_queued) |
c906108c SS |
978 | { |
979 | make_run_cleanup (do_clear_solib, NULL); | |
980 | solib_cleanup_queued = 1; | |
981 | } | |
c5aa993b JM |
982 | |
983 | } | |
c906108c | 984 | so_list_next = new; |
c5aa993b | 985 | read_memory ((CORE_ADDR) lm, (char *) &(new->lm), |
c906108c SS |
986 | sizeof (struct link_map)); |
987 | /* For SVR4 versions, the first entry in the link map is for the | |
c5aa993b JM |
988 | inferior executable, so we must ignore it. For some versions of |
989 | SVR4, it has no name. For others (Solaris 2.3 for example), it | |
990 | does have a name, so we can no longer use a missing name to | |
991 | decide when to ignore it. */ | |
992 | if (!IGNORE_FIRST_LINK_MAP_ENTRY (new->lm)) | |
c906108c SS |
993 | { |
994 | int errcode; | |
995 | char *buffer; | |
996 | target_read_string ((CORE_ADDR) LM_NAME (new), &buffer, | |
997 | MAX_PATH_SIZE - 1, &errcode); | |
998 | if (errcode != 0) | |
999 | { | |
1000 | warning ("find_solib: Can't read pathname for load map: %s\n", | |
1001 | safe_strerror (errcode)); | |
1002 | return (so_list_next); | |
1003 | } | |
c5aa993b JM |
1004 | strncpy (new->so_name, buffer, MAX_PATH_SIZE - 1); |
1005 | new->so_name[MAX_PATH_SIZE - 1] = '\0'; | |
c906108c SS |
1006 | free (buffer); |
1007 | catch_errors (solib_map_sections, new, | |
1008 | "Error while mapping shared library sections:\n", | |
1009 | RETURN_MASK_ALL); | |
c5aa993b | 1010 | } |
c906108c SS |
1011 | } |
1012 | return (so_list_next); | |
1013 | } | |
1014 | ||
1015 | /* A small stub to get us past the arg-passing pinhole of catch_errors. */ | |
1016 | ||
1017 | static int | |
1018 | symbol_add_stub (arg) | |
1019 | PTR arg; | |
1020 | { | |
c5aa993b | 1021 | register struct so_list *so = (struct so_list *) arg; /* catch_errs bogon */ |
c906108c SS |
1022 | CORE_ADDR text_addr = 0; |
1023 | ||
c5aa993b JM |
1024 | if (so->textsection) |
1025 | text_addr = so->textsection->addr; | |
1026 | else if (so->abfd != NULL) | |
c906108c SS |
1027 | { |
1028 | asection *lowest_sect; | |
1029 | ||
1030 | /* If we didn't find a mapped non zero sized .text section, set up | |
c5aa993b | 1031 | text_addr so that the relocation in symbol_file_add does no harm. */ |
c906108c | 1032 | |
c5aa993b | 1033 | lowest_sect = bfd_get_section_by_name (so->abfd, ".text"); |
c906108c | 1034 | if (lowest_sect == NULL) |
c5aa993b JM |
1035 | bfd_map_over_sections (so->abfd, find_lowest_section, |
1036 | (PTR) & lowest_sect); | |
c906108c | 1037 | if (lowest_sect) |
c5aa993b JM |
1038 | text_addr = bfd_section_vma (so->abfd, lowest_sect) |
1039 | + (CORE_ADDR) LM_ADDR (so); | |
c906108c | 1040 | } |
c5aa993b JM |
1041 | |
1042 | ALL_OBJFILES (so->objfile) | |
1043 | { | |
1044 | if (strcmp (so->objfile->name, so->so_name) == 0) | |
1045 | return 1; | |
1046 | } | |
1047 | so->objfile = | |
1048 | symbol_file_add (so->so_name, so->from_tty, | |
c906108c SS |
1049 | text_addr, |
1050 | 0, 0, 0, 0, 1); | |
1051 | return (1); | |
1052 | } | |
1053 | ||
1054 | /* This function will check the so name to see if matches the main list. | |
1055 | In some system the main object is in the list, which we want to exclude */ | |
1056 | ||
c5aa993b JM |
1057 | static int |
1058 | match_main (soname) | |
1059 | char *soname; | |
c906108c SS |
1060 | { |
1061 | char **mainp; | |
1062 | ||
1063 | for (mainp = main_name_list; *mainp != NULL; mainp++) | |
1064 | { | |
1065 | if (strcmp (soname, *mainp) == 0) | |
1066 | return (1); | |
1067 | } | |
1068 | ||
1069 | return (0); | |
1070 | } | |
1071 | ||
1072 | /* | |
1073 | ||
c5aa993b | 1074 | GLOBAL FUNCTION |
c906108c | 1075 | |
c5aa993b | 1076 | solib_add -- add a shared library file to the symtab and section list |
c906108c | 1077 | |
c5aa993b | 1078 | SYNOPSIS |
c906108c | 1079 | |
c5aa993b JM |
1080 | void solib_add (char *arg_string, int from_tty, |
1081 | struct target_ops *target) | |
c906108c | 1082 | |
c5aa993b | 1083 | DESCRIPTION |
c906108c | 1084 | |
c5aa993b | 1085 | */ |
c906108c SS |
1086 | |
1087 | void | |
1088 | solib_add (arg_string, from_tty, target) | |
1089 | char *arg_string; | |
1090 | int from_tty; | |
1091 | struct target_ops *target; | |
c5aa993b JM |
1092 | { |
1093 | register struct so_list *so = NULL; /* link map state variable */ | |
c906108c SS |
1094 | |
1095 | /* Last shared library that we read. */ | |
1096 | struct so_list *so_last = NULL; | |
1097 | ||
1098 | char *re_err; | |
1099 | int count; | |
1100 | int old; | |
c5aa993b | 1101 | |
c906108c SS |
1102 | if ((re_err = re_comp (arg_string ? arg_string : ".")) != NULL) |
1103 | { | |
1104 | error ("Invalid regexp: %s", re_err); | |
1105 | } | |
c5aa993b | 1106 | |
c906108c SS |
1107 | /* Add the shared library sections to the section table of the |
1108 | specified target, if any. */ | |
1109 | if (target) | |
1110 | { | |
1111 | /* Count how many new section_table entries there are. */ | |
1112 | so = NULL; | |
1113 | count = 0; | |
1114 | while ((so = find_solib (so)) != NULL) | |
1115 | { | |
c5aa993b | 1116 | if (so->so_name[0] && !match_main (so->so_name)) |
c906108c | 1117 | { |
c5aa993b | 1118 | count += so->sections_end - so->sections; |
c906108c SS |
1119 | } |
1120 | } | |
c5aa993b | 1121 | |
c906108c SS |
1122 | if (count) |
1123 | { | |
1124 | int update_coreops; | |
1125 | ||
1126 | /* We must update the to_sections field in the core_ops structure | |
1127 | here, otherwise we dereference a potential dangling pointer | |
1128 | for each call to target_read/write_memory within this routine. */ | |
1129 | update_coreops = core_ops.to_sections == target->to_sections; | |
c5aa993b | 1130 | |
c906108c | 1131 | /* Reallocate the target's section table including the new size. */ |
c5aa993b | 1132 | if (target->to_sections) |
c906108c | 1133 | { |
c5aa993b JM |
1134 | old = target->to_sections_end - target->to_sections; |
1135 | target->to_sections = (struct section_table *) | |
1136 | xrealloc ((char *) target->to_sections, | |
1137 | (sizeof (struct section_table)) * (count + old)); | |
c906108c SS |
1138 | } |
1139 | else | |
1140 | { | |
1141 | old = 0; | |
c5aa993b | 1142 | target->to_sections = (struct section_table *) |
c906108c SS |
1143 | xmalloc ((sizeof (struct section_table)) * count); |
1144 | } | |
c5aa993b JM |
1145 | target->to_sections_end = target->to_sections + (count + old); |
1146 | ||
c906108c SS |
1147 | /* Update the to_sections field in the core_ops structure |
1148 | if needed. */ | |
1149 | if (update_coreops) | |
1150 | { | |
1151 | core_ops.to_sections = target->to_sections; | |
1152 | core_ops.to_sections_end = target->to_sections_end; | |
1153 | } | |
1154 | ||
1155 | /* Add these section table entries to the target's table. */ | |
1156 | while ((so = find_solib (so)) != NULL) | |
1157 | { | |
c5aa993b | 1158 | if (so->so_name[0]) |
c906108c | 1159 | { |
c5aa993b JM |
1160 | count = so->sections_end - so->sections; |
1161 | memcpy ((char *) (target->to_sections + old), | |
1162 | so->sections, | |
c906108c SS |
1163 | (sizeof (struct section_table)) * count); |
1164 | old += count; | |
1165 | } | |
1166 | } | |
1167 | } | |
1168 | } | |
c5aa993b | 1169 | |
c906108c SS |
1170 | /* Now add the symbol files. */ |
1171 | while ((so = find_solib (so)) != NULL) | |
1172 | { | |
c5aa993b JM |
1173 | if (so->so_name[0] && re_exec (so->so_name) && |
1174 | !match_main (so->so_name)) | |
c906108c | 1175 | { |
c5aa993b JM |
1176 | so->from_tty = from_tty; |
1177 | if (so->symbols_loaded) | |
c906108c SS |
1178 | { |
1179 | if (from_tty) | |
1180 | { | |
c5aa993b | 1181 | printf_unfiltered ("Symbols already loaded for %s\n", so->so_name); |
c906108c SS |
1182 | } |
1183 | } | |
1184 | else if (catch_errors | |
1185 | (symbol_add_stub, so, | |
1186 | "Error while reading shared library symbols:\n", | |
1187 | RETURN_MASK_ALL)) | |
1188 | { | |
1189 | so_last = so; | |
c5aa993b | 1190 | so->symbols_loaded = 1; |
c906108c SS |
1191 | } |
1192 | } | |
1193 | } | |
1194 | ||
1195 | /* Getting new symbols may change our opinion about what is | |
1196 | frameless. */ | |
1197 | if (so_last) | |
1198 | reinit_frame_cache (); | |
1199 | ||
1200 | if (so_last) | |
1201 | special_symbol_handling (so_last); | |
1202 | } | |
1203 | ||
1204 | /* | |
1205 | ||
c5aa993b | 1206 | LOCAL FUNCTION |
c906108c | 1207 | |
c5aa993b | 1208 | info_sharedlibrary_command -- code for "info sharedlibrary" |
c906108c | 1209 | |
c5aa993b | 1210 | SYNOPSIS |
c906108c | 1211 | |
c5aa993b | 1212 | static void info_sharedlibrary_command () |
c906108c | 1213 | |
c5aa993b | 1214 | DESCRIPTION |
c906108c | 1215 | |
c5aa993b JM |
1216 | Walk through the shared library list and print information |
1217 | about each attached library. | |
1218 | */ | |
c906108c SS |
1219 | |
1220 | static void | |
1221 | info_sharedlibrary_command (ignore, from_tty) | |
1222 | char *ignore; | |
1223 | int from_tty; | |
1224 | { | |
c5aa993b | 1225 | register struct so_list *so = NULL; /* link map state variable */ |
c906108c SS |
1226 | int header_done = 0; |
1227 | int addr_width; | |
1228 | char *addr_fmt; | |
1229 | ||
1230 | if (exec_bfd == NULL) | |
1231 | { | |
1232 | printf_unfiltered ("No exec file.\n"); | |
1233 | return; | |
1234 | } | |
1235 | ||
1236 | #ifndef TARGET_ELF64 | |
c5aa993b | 1237 | addr_width = 8 + 4; |
c906108c SS |
1238 | addr_fmt = "08l"; |
1239 | #else | |
c5aa993b | 1240 | addr_width = 16 + 4; |
c906108c SS |
1241 | addr_fmt = "016l"; |
1242 | #endif | |
1243 | ||
1244 | while ((so = find_solib (so)) != NULL) | |
1245 | { | |
c5aa993b | 1246 | if (so->so_name[0]) |
c906108c SS |
1247 | { |
1248 | if (!header_done) | |
1249 | { | |
c5aa993b JM |
1250 | printf_unfiltered ("%-*s%-*s%-12s%s\n", addr_width, "From", |
1251 | addr_width, "To", "Syms Read", | |
1252 | "Shared Object Library"); | |
c906108c SS |
1253 | header_done++; |
1254 | } | |
1255 | ||
1256 | printf_unfiltered ("%-*s", addr_width, | |
c5aa993b JM |
1257 | local_hex_string_custom ((unsigned long) LM_ADDR (so), |
1258 | addr_fmt)); | |
c906108c | 1259 | printf_unfiltered ("%-*s", addr_width, |
c5aa993b JM |
1260 | local_hex_string_custom ((unsigned long) so->lmend, |
1261 | addr_fmt)); | |
1262 | printf_unfiltered ("%-12s", so->symbols_loaded ? "Yes" : "No"); | |
1263 | printf_unfiltered ("%s\n", so->so_name); | |
c906108c SS |
1264 | } |
1265 | } | |
1266 | if (so_list_head == NULL) | |
1267 | { | |
c5aa993b | 1268 | printf_unfiltered ("No shared libraries loaded at this time.\n"); |
c906108c SS |
1269 | } |
1270 | } | |
1271 | ||
1272 | /* | |
1273 | ||
c5aa993b | 1274 | GLOBAL FUNCTION |
c906108c | 1275 | |
c5aa993b | 1276 | solib_address -- check to see if an address is in a shared lib |
c906108c | 1277 | |
c5aa993b | 1278 | SYNOPSIS |
c906108c | 1279 | |
c5aa993b | 1280 | char * solib_address (CORE_ADDR address) |
c906108c | 1281 | |
c5aa993b | 1282 | DESCRIPTION |
c906108c | 1283 | |
c5aa993b JM |
1284 | Provides a hook for other gdb routines to discover whether or |
1285 | not a particular address is within the mapped address space of | |
1286 | a shared library. Any address between the base mapping address | |
1287 | and the first address beyond the end of the last mapping, is | |
1288 | considered to be within the shared library address space, for | |
1289 | our purposes. | |
c906108c | 1290 | |
c5aa993b JM |
1291 | For example, this routine is called at one point to disable |
1292 | breakpoints which are in shared libraries that are not currently | |
1293 | mapped in. | |
c906108c SS |
1294 | */ |
1295 | ||
1296 | char * | |
1297 | solib_address (address) | |
1298 | CORE_ADDR address; | |
1299 | { | |
c5aa993b JM |
1300 | register struct so_list *so = 0; /* link map state variable */ |
1301 | ||
c906108c SS |
1302 | while ((so = find_solib (so)) != NULL) |
1303 | { | |
c5aa993b | 1304 | if (so->so_name[0]) |
c906108c SS |
1305 | { |
1306 | if ((address >= (CORE_ADDR) LM_ADDR (so)) && | |
c5aa993b | 1307 | (address < (CORE_ADDR) so->lmend)) |
c906108c SS |
1308 | return (so->so_name); |
1309 | } | |
1310 | } | |
1311 | return (0); | |
1312 | } | |
1313 | ||
1314 | /* Called by free_all_symtabs */ | |
1315 | ||
c5aa993b | 1316 | void |
085dd6e6 | 1317 | clear_solib () |
c906108c SS |
1318 | { |
1319 | struct so_list *next; | |
1320 | char *bfd_filename; | |
7a292a7a | 1321 | |
085dd6e6 JM |
1322 | /* This function is expected to handle ELF shared libraries. It is |
1323 | also used on Solaris, which can run either ELF or a.out binaries | |
1324 | (for compatibility with SunOS 4), both of which can use shared | |
1325 | libraries. So we don't know whether we have an ELF executable or | |
1326 | an a.out executable until the user chooses an executable file. | |
1327 | ||
1328 | ELF shared libraries don't get mapped into the address space | |
1329 | until after the program starts, so we'd better not try to insert | |
1330 | breakpoints in them immediately. We have to wait until the | |
1331 | dynamic linker has loaded them; we'll hit a bp_shlib_event | |
1332 | breakpoint (look for calls to create_solib_event_breakpoint) when | |
1333 | it's ready. | |
1334 | ||
1335 | SunOS shared libraries seem to be different --- they're present | |
1336 | as soon as the process begins execution, so there's no need to | |
1337 | put off inserting breakpoints. There's also nowhere to put a | |
1338 | bp_shlib_event breakpoint, so if we put it off, we'll never get | |
1339 | around to it. | |
1340 | ||
1341 | So: disable breakpoints only if we're using ELF shared libs. */ | |
1342 | if (exec_bfd != NULL | |
1343 | && bfd_get_flavour (exec_bfd) != bfd_target_aout_flavour) | |
1344 | disable_breakpoints_in_shlibs (1); | |
1345 | ||
c906108c SS |
1346 | while (so_list_head) |
1347 | { | |
c5aa993b | 1348 | if (so_list_head->sections) |
c906108c | 1349 | { |
c5aa993b | 1350 | free ((PTR) so_list_head->sections); |
c906108c | 1351 | } |
c5aa993b | 1352 | if (so_list_head->abfd) |
c906108c | 1353 | { |
c5aa993b JM |
1354 | bfd_filename = bfd_get_filename (so_list_head->abfd); |
1355 | if (!bfd_close (so_list_head->abfd)) | |
c906108c SS |
1356 | warning ("cannot close \"%s\": %s", |
1357 | bfd_filename, bfd_errmsg (bfd_get_error ())); | |
1358 | } | |
1359 | else | |
1360 | /* This happens for the executable on SVR4. */ | |
1361 | bfd_filename = NULL; | |
1362 | ||
c5aa993b | 1363 | next = so_list_head->next; |
c906108c | 1364 | if (bfd_filename) |
c5aa993b JM |
1365 | free ((PTR) bfd_filename); |
1366 | free ((PTR) so_list_head); | |
c906108c SS |
1367 | so_list_head = next; |
1368 | } | |
1369 | debug_base = 0; | |
1370 | } | |
1371 | ||
1372 | static void | |
1373 | do_clear_solib (dummy) | |
1374 | PTR dummy; | |
1375 | { | |
1376 | solib_cleanup_queued = 0; | |
1377 | clear_solib (); | |
1378 | } | |
1379 | ||
1380 | #ifdef SVR4_SHARED_LIBS | |
1381 | ||
1382 | /* Return 1 if PC lies in the dynamic symbol resolution code of the | |
1383 | SVR4 run time loader. */ | |
1384 | ||
1385 | static CORE_ADDR interp_text_sect_low; | |
1386 | static CORE_ADDR interp_text_sect_high; | |
1387 | static CORE_ADDR interp_plt_sect_low; | |
1388 | static CORE_ADDR interp_plt_sect_high; | |
1389 | ||
1390 | int | |
1391 | in_svr4_dynsym_resolve_code (pc) | |
1392 | CORE_ADDR pc; | |
1393 | { | |
1394 | return ((pc >= interp_text_sect_low && pc < interp_text_sect_high) | |
1395 | || (pc >= interp_plt_sect_low && pc < interp_plt_sect_high) | |
1396 | || in_plt_section (pc, NULL)); | |
1397 | } | |
1398 | #endif | |
1399 | ||
1400 | /* | |
1401 | ||
c5aa993b | 1402 | LOCAL FUNCTION |
c906108c | 1403 | |
c5aa993b | 1404 | disable_break -- remove the "mapping changed" breakpoint |
c906108c | 1405 | |
c5aa993b | 1406 | SYNOPSIS |
c906108c | 1407 | |
c5aa993b | 1408 | static int disable_break () |
c906108c | 1409 | |
c5aa993b | 1410 | DESCRIPTION |
c906108c | 1411 | |
c5aa993b JM |
1412 | Removes the breakpoint that gets hit when the dynamic linker |
1413 | completes a mapping change. | |
c906108c | 1414 | |
c5aa993b | 1415 | */ |
c906108c SS |
1416 | |
1417 | #ifndef SVR4_SHARED_LIBS | |
1418 | ||
1419 | static int | |
1420 | disable_break () | |
1421 | { | |
1422 | int status = 1; | |
1423 | ||
1424 | #ifndef SVR4_SHARED_LIBS | |
1425 | ||
1426 | int in_debugger = 0; | |
c5aa993b | 1427 | |
c906108c SS |
1428 | /* Read the debugger structure from the inferior to retrieve the |
1429 | address of the breakpoint and the original contents of the | |
1430 | breakpoint address. Remove the breakpoint by writing the original | |
1431 | contents back. */ | |
1432 | ||
1433 | read_memory (debug_addr, (char *) &debug_copy, sizeof (debug_copy)); | |
1434 | ||
1435 | /* Set `in_debugger' to zero now. */ | |
1436 | ||
1437 | write_memory (flag_addr, (char *) &in_debugger, sizeof (in_debugger)); | |
1438 | ||
1439 | breakpoint_addr = (CORE_ADDR) debug_copy.ldd_bp_addr; | |
1440 | write_memory (breakpoint_addr, (char *) &debug_copy.ldd_bp_inst, | |
1441 | sizeof (debug_copy.ldd_bp_inst)); | |
1442 | ||
c5aa993b | 1443 | #else /* SVR4_SHARED_LIBS */ |
c906108c SS |
1444 | |
1445 | /* Note that breakpoint address and original contents are in our address | |
1446 | space, so we just need to write the original contents back. */ | |
1447 | ||
1448 | if (memory_remove_breakpoint (breakpoint_addr, shadow_contents) != 0) | |
1449 | { | |
1450 | status = 0; | |
1451 | } | |
1452 | ||
c5aa993b | 1453 | #endif /* !SVR4_SHARED_LIBS */ |
c906108c SS |
1454 | |
1455 | /* For the SVR4 version, we always know the breakpoint address. For the | |
1456 | SunOS version we don't know it until the above code is executed. | |
1457 | Grumble if we are stopped anywhere besides the breakpoint address. */ | |
1458 | ||
1459 | if (stop_pc != breakpoint_addr) | |
1460 | { | |
1461 | warning ("stopped at unknown breakpoint while handling shared libraries"); | |
1462 | } | |
1463 | ||
1464 | return (status); | |
1465 | } | |
1466 | ||
c5aa993b | 1467 | #endif /* #ifdef SVR4_SHARED_LIBS */ |
c906108c SS |
1468 | |
1469 | /* | |
1470 | ||
c5aa993b JM |
1471 | LOCAL FUNCTION |
1472 | ||
1473 | enable_break -- arrange for dynamic linker to hit breakpoint | |
1474 | ||
1475 | SYNOPSIS | |
1476 | ||
1477 | int enable_break (void) | |
1478 | ||
1479 | DESCRIPTION | |
1480 | ||
1481 | Both the SunOS and the SVR4 dynamic linkers have, as part of their | |
1482 | debugger interface, support for arranging for the inferior to hit | |
1483 | a breakpoint after mapping in the shared libraries. This function | |
1484 | enables that breakpoint. | |
1485 | ||
1486 | For SunOS, there is a special flag location (in_debugger) which we | |
1487 | set to 1. When the dynamic linker sees this flag set, it will set | |
1488 | a breakpoint at a location known only to itself, after saving the | |
1489 | original contents of that place and the breakpoint address itself, | |
1490 | in it's own internal structures. When we resume the inferior, it | |
1491 | will eventually take a SIGTRAP when it runs into the breakpoint. | |
1492 | We handle this (in a different place) by restoring the contents of | |
1493 | the breakpointed location (which is only known after it stops), | |
1494 | chasing around to locate the shared libraries that have been | |
1495 | loaded, then resuming. | |
1496 | ||
1497 | For SVR4, the debugger interface structure contains a member (r_brk) | |
1498 | which is statically initialized at the time the shared library is | |
1499 | built, to the offset of a function (_r_debug_state) which is guaran- | |
1500 | teed to be called once before mapping in a library, and again when | |
1501 | the mapping is complete. At the time we are examining this member, | |
1502 | it contains only the unrelocated offset of the function, so we have | |
1503 | to do our own relocation. Later, when the dynamic linker actually | |
1504 | runs, it relocates r_brk to be the actual address of _r_debug_state(). | |
1505 | ||
1506 | The debugger interface structure also contains an enumeration which | |
1507 | is set to either RT_ADD or RT_DELETE prior to changing the mapping, | |
1508 | depending upon whether or not the library is being mapped or unmapped, | |
1509 | and then set to RT_CONSISTENT after the library is mapped/unmapped. | |
1510 | */ | |
c906108c SS |
1511 | |
1512 | static int | |
1513 | enable_break () | |
1514 | { | |
1515 | int success = 0; | |
1516 | ||
1517 | #ifndef SVR4_SHARED_LIBS | |
1518 | ||
1519 | int j; | |
1520 | int in_debugger; | |
1521 | ||
1522 | /* Get link_dynamic structure */ | |
1523 | ||
1524 | j = target_read_memory (debug_base, (char *) &dynamic_copy, | |
1525 | sizeof (dynamic_copy)); | |
1526 | if (j) | |
1527 | { | |
1528 | /* unreadable */ | |
1529 | return (0); | |
1530 | } | |
1531 | ||
1532 | /* Calc address of debugger interface structure */ | |
1533 | ||
1534 | debug_addr = (CORE_ADDR) dynamic_copy.ldd; | |
1535 | ||
1536 | /* Calc address of `in_debugger' member of debugger interface structure */ | |
1537 | ||
1538 | flag_addr = debug_addr + (CORE_ADDR) ((char *) &debug_copy.ldd_in_debugger - | |
1539 | (char *) &debug_copy); | |
1540 | ||
1541 | /* Write a value of 1 to this member. */ | |
1542 | ||
1543 | in_debugger = 1; | |
1544 | write_memory (flag_addr, (char *) &in_debugger, sizeof (in_debugger)); | |
1545 | success = 1; | |
1546 | ||
c5aa993b | 1547 | #else /* SVR4_SHARED_LIBS */ |
c906108c SS |
1548 | |
1549 | #ifdef BKPT_AT_SYMBOL | |
1550 | ||
1551 | struct minimal_symbol *msymbol; | |
1552 | char **bkpt_namep; | |
1553 | asection *interp_sect; | |
1554 | ||
1555 | /* First, remove all the solib event breakpoints. Their addresses | |
1556 | may have changed since the last time we ran the program. */ | |
1557 | remove_solib_event_breakpoints (); | |
1558 | ||
1559 | #ifdef SVR4_SHARED_LIBS | |
1560 | interp_text_sect_low = interp_text_sect_high = 0; | |
1561 | interp_plt_sect_low = interp_plt_sect_high = 0; | |
1562 | ||
1563 | /* Find the .interp section; if not found, warn the user and drop | |
1564 | into the old breakpoint at symbol code. */ | |
1565 | interp_sect = bfd_get_section_by_name (exec_bfd, ".interp"); | |
1566 | if (interp_sect) | |
1567 | { | |
1568 | unsigned int interp_sect_size; | |
1569 | char *buf; | |
1570 | CORE_ADDR load_addr; | |
1571 | bfd *tmp_bfd; | |
1572 | CORE_ADDR sym_addr = 0; | |
1573 | ||
1574 | /* Read the contents of the .interp section into a local buffer; | |
c5aa993b | 1575 | the contents specify the dynamic linker this program uses. */ |
c906108c SS |
1576 | interp_sect_size = bfd_section_size (exec_bfd, interp_sect); |
1577 | buf = alloca (interp_sect_size); | |
1578 | bfd_get_section_contents (exec_bfd, interp_sect, | |
1579 | buf, 0, interp_sect_size); | |
1580 | ||
1581 | /* Now we need to figure out where the dynamic linker was | |
c5aa993b JM |
1582 | loaded so that we can load its symbols and place a breakpoint |
1583 | in the dynamic linker itself. | |
c906108c | 1584 | |
c5aa993b JM |
1585 | This address is stored on the stack. However, I've been unable |
1586 | to find any magic formula to find it for Solaris (appears to | |
1587 | be trivial on GNU/Linux). Therefore, we have to try an alternate | |
1588 | mechanism to find the dynamic linker's base address. */ | |
c906108c SS |
1589 | tmp_bfd = bfd_openr (buf, gnutarget); |
1590 | if (tmp_bfd == NULL) | |
1591 | goto bkpt_at_symbol; | |
1592 | ||
1593 | /* Make sure the dynamic linker's really a useful object. */ | |
1594 | if (!bfd_check_format (tmp_bfd, bfd_object)) | |
1595 | { | |
1596 | warning ("Unable to grok dynamic linker %s as an object file", buf); | |
1597 | bfd_close (tmp_bfd); | |
1598 | goto bkpt_at_symbol; | |
1599 | } | |
1600 | ||
1601 | /* We find the dynamic linker's base address by examining the | |
c5aa993b JM |
1602 | current pc (which point at the entry point for the dynamic |
1603 | linker) and subtracting the offset of the entry point. */ | |
c906108c SS |
1604 | load_addr = read_pc () - tmp_bfd->start_address; |
1605 | ||
1606 | /* Record the relocated start and end address of the dynamic linker | |
c5aa993b | 1607 | text and plt section for in_svr4_dynsym_resolve_code. */ |
c906108c SS |
1608 | interp_sect = bfd_get_section_by_name (tmp_bfd, ".text"); |
1609 | if (interp_sect) | |
1610 | { | |
1611 | interp_text_sect_low = | |
1612 | bfd_section_vma (tmp_bfd, interp_sect) + load_addr; | |
1613 | interp_text_sect_high = | |
1614 | interp_text_sect_low + bfd_section_size (tmp_bfd, interp_sect); | |
1615 | } | |
1616 | interp_sect = bfd_get_section_by_name (tmp_bfd, ".plt"); | |
1617 | if (interp_sect) | |
1618 | { | |
1619 | interp_plt_sect_low = | |
1620 | bfd_section_vma (tmp_bfd, interp_sect) + load_addr; | |
1621 | interp_plt_sect_high = | |
1622 | interp_plt_sect_low + bfd_section_size (tmp_bfd, interp_sect); | |
1623 | } | |
1624 | ||
1625 | /* Now try to set a breakpoint in the dynamic linker. */ | |
1626 | for (bkpt_namep = solib_break_names; *bkpt_namep != NULL; bkpt_namep++) | |
1627 | { | |
1628 | sym_addr = bfd_lookup_symbol (tmp_bfd, *bkpt_namep); | |
1629 | if (sym_addr != 0) | |
1630 | break; | |
1631 | } | |
1632 | ||
1633 | /* We're done with the temporary bfd. */ | |
1634 | bfd_close (tmp_bfd); | |
1635 | ||
1636 | if (sym_addr != 0) | |
1637 | { | |
1638 | create_solib_event_breakpoint (load_addr + sym_addr); | |
1639 | return 1; | |
1640 | } | |
1641 | ||
1642 | /* For whatever reason we couldn't set a breakpoint in the dynamic | |
c5aa993b JM |
1643 | linker. Warn and drop into the old code. */ |
1644 | bkpt_at_symbol: | |
c906108c SS |
1645 | warning ("Unable to find dynamic linker breakpoint function.\nGDB will be unable to debug shared library initializers\nand track explicitly loaded dynamic code."); |
1646 | } | |
1647 | #endif | |
1648 | ||
1649 | /* Scan through the list of symbols, trying to look up the symbol and | |
1650 | set a breakpoint there. Terminate loop when we/if we succeed. */ | |
1651 | ||
1652 | breakpoint_addr = 0; | |
1653 | for (bkpt_namep = bkpt_names; *bkpt_namep != NULL; bkpt_namep++) | |
1654 | { | |
1655 | msymbol = lookup_minimal_symbol (*bkpt_namep, NULL, symfile_objfile); | |
1656 | if ((msymbol != NULL) && (SYMBOL_VALUE_ADDRESS (msymbol) != 0)) | |
1657 | { | |
1658 | create_solib_event_breakpoint (SYMBOL_VALUE_ADDRESS (msymbol)); | |
1659 | return 1; | |
1660 | } | |
1661 | } | |
1662 | ||
1663 | /* Nothing good happened. */ | |
1664 | success = 0; | |
1665 | ||
c5aa993b | 1666 | #endif /* BKPT_AT_SYMBOL */ |
c906108c | 1667 | |
c5aa993b | 1668 | #endif /* !SVR4_SHARED_LIBS */ |
c906108c SS |
1669 | |
1670 | return (success); | |
1671 | } | |
c5aa993b | 1672 | |
c906108c | 1673 | /* |
c5aa993b JM |
1674 | |
1675 | GLOBAL FUNCTION | |
1676 | ||
1677 | solib_create_inferior_hook -- shared library startup support | |
1678 | ||
1679 | SYNOPSIS | |
1680 | ||
1681 | void solib_create_inferior_hook() | |
1682 | ||
1683 | DESCRIPTION | |
1684 | ||
1685 | When gdb starts up the inferior, it nurses it along (through the | |
1686 | shell) until it is ready to execute it's first instruction. At this | |
1687 | point, this function gets called via expansion of the macro | |
1688 | SOLIB_CREATE_INFERIOR_HOOK. | |
1689 | ||
1690 | For SunOS executables, this first instruction is typically the | |
1691 | one at "_start", or a similar text label, regardless of whether | |
1692 | the executable is statically or dynamically linked. The runtime | |
1693 | startup code takes care of dynamically linking in any shared | |
1694 | libraries, once gdb allows the inferior to continue. | |
1695 | ||
1696 | For SVR4 executables, this first instruction is either the first | |
1697 | instruction in the dynamic linker (for dynamically linked | |
1698 | executables) or the instruction at "start" for statically linked | |
1699 | executables. For dynamically linked executables, the system | |
1700 | first exec's /lib/libc.so.N, which contains the dynamic linker, | |
1701 | and starts it running. The dynamic linker maps in any needed | |
1702 | shared libraries, maps in the actual user executable, and then | |
1703 | jumps to "start" in the user executable. | |
1704 | ||
1705 | For both SunOS shared libraries, and SVR4 shared libraries, we | |
1706 | can arrange to cooperate with the dynamic linker to discover the | |
1707 | names of shared libraries that are dynamically linked, and the | |
1708 | base addresses to which they are linked. | |
1709 | ||
1710 | This function is responsible for discovering those names and | |
1711 | addresses, and saving sufficient information about them to allow | |
1712 | their symbols to be read at a later time. | |
1713 | ||
1714 | FIXME | |
1715 | ||
1716 | Between enable_break() and disable_break(), this code does not | |
1717 | properly handle hitting breakpoints which the user might have | |
1718 | set in the startup code or in the dynamic linker itself. Proper | |
1719 | handling will probably have to wait until the implementation is | |
1720 | changed to use the "breakpoint handler function" method. | |
1721 | ||
1722 | Also, what if child has exit()ed? Must exit loop somehow. | |
1723 | */ | |
1724 | ||
1725 | void | |
1726 | solib_create_inferior_hook () | |
c906108c SS |
1727 | { |
1728 | /* If we are using the BKPT_AT_SYMBOL code, then we don't need the base | |
1729 | yet. In fact, in the case of a SunOS4 executable being run on | |
1730 | Solaris, we can't get it yet. find_solib will get it when it needs | |
1731 | it. */ | |
1732 | #if !(defined (SVR4_SHARED_LIBS) && defined (BKPT_AT_SYMBOL)) | |
1733 | if ((debug_base = locate_base ()) == 0) | |
1734 | { | |
1735 | /* Can't find the symbol or the executable is statically linked. */ | |
1736 | return; | |
1737 | } | |
1738 | #endif | |
1739 | ||
1740 | if (!enable_break ()) | |
1741 | { | |
1742 | warning ("shared library handler failed to enable breakpoint"); | |
1743 | return; | |
1744 | } | |
1745 | ||
1746 | #if !defined(SVR4_SHARED_LIBS) || defined(_SCO_DS) | |
1747 | /* SCO and SunOS need the loop below, other systems should be using the | |
1748 | special shared library breakpoints and the shared library breakpoint | |
1749 | service routine. | |
1750 | ||
1751 | Now run the target. It will eventually hit the breakpoint, at | |
1752 | which point all of the libraries will have been mapped in and we | |
1753 | can go groveling around in the dynamic linker structures to find | |
1754 | out what we need to know about them. */ | |
1755 | ||
1756 | clear_proceed_status (); | |
1757 | stop_soon_quietly = 1; | |
1758 | stop_signal = TARGET_SIGNAL_0; | |
1759 | do | |
1760 | { | |
1761 | target_resume (-1, 0, stop_signal); | |
1762 | wait_for_inferior (); | |
1763 | } | |
1764 | while (stop_signal != TARGET_SIGNAL_TRAP); | |
1765 | stop_soon_quietly = 0; | |
1766 | ||
1767 | #if !defined(_SCO_DS) | |
1768 | /* We are now either at the "mapping complete" breakpoint (or somewhere | |
1769 | else, a condition we aren't prepared to deal with anyway), so adjust | |
1770 | the PC as necessary after a breakpoint, disable the breakpoint, and | |
1771 | add any shared libraries that were mapped in. */ | |
1772 | ||
1773 | if (DECR_PC_AFTER_BREAK) | |
1774 | { | |
1775 | stop_pc -= DECR_PC_AFTER_BREAK; | |
1776 | write_register (PC_REGNUM, stop_pc); | |
1777 | } | |
1778 | ||
1779 | if (!disable_break ()) | |
1780 | { | |
1781 | warning ("shared library handler failed to disable breakpoint"); | |
1782 | } | |
1783 | ||
1784 | if (auto_solib_add) | |
1785 | solib_add ((char *) 0, 0, (struct target_ops *) 0); | |
1786 | #endif /* ! _SCO_DS */ | |
1787 | #endif | |
1788 | } | |
1789 | ||
1790 | /* | |
1791 | ||
c5aa993b | 1792 | LOCAL FUNCTION |
c906108c | 1793 | |
c5aa993b | 1794 | special_symbol_handling -- additional shared library symbol handling |
c906108c | 1795 | |
c5aa993b | 1796 | SYNOPSIS |
c906108c | 1797 | |
c5aa993b | 1798 | void special_symbol_handling (struct so_list *so) |
c906108c | 1799 | |
c5aa993b | 1800 | DESCRIPTION |
c906108c | 1801 | |
c5aa993b JM |
1802 | Once the symbols from a shared object have been loaded in the usual |
1803 | way, we are called to do any system specific symbol handling that | |
1804 | is needed. | |
c906108c | 1805 | |
c5aa993b JM |
1806 | For SunOS4, this consists of grunging around in the dynamic |
1807 | linkers structures to find symbol definitions for "common" symbols | |
1808 | and adding them to the minimal symbol table for the runtime common | |
1809 | objfile. | |
c906108c | 1810 | |
c5aa993b | 1811 | */ |
c906108c SS |
1812 | |
1813 | static void | |
1814 | special_symbol_handling (so) | |
c5aa993b | 1815 | struct so_list *so; |
c906108c SS |
1816 | { |
1817 | #ifndef SVR4_SHARED_LIBS | |
1818 | int j; | |
1819 | ||
1820 | if (debug_addr == 0) | |
1821 | { | |
1822 | /* Get link_dynamic structure */ | |
1823 | ||
1824 | j = target_read_memory (debug_base, (char *) &dynamic_copy, | |
1825 | sizeof (dynamic_copy)); | |
1826 | if (j) | |
1827 | { | |
1828 | /* unreadable */ | |
1829 | return; | |
1830 | } | |
1831 | ||
1832 | /* Calc address of debugger interface structure */ | |
1833 | /* FIXME, this needs work for cross-debugging of core files | |
c5aa993b | 1834 | (byteorder, size, alignment, etc). */ |
c906108c SS |
1835 | |
1836 | debug_addr = (CORE_ADDR) dynamic_copy.ldd; | |
1837 | } | |
1838 | ||
1839 | /* Read the debugger structure from the inferior, just to make sure | |
1840 | we have a current copy. */ | |
1841 | ||
1842 | j = target_read_memory (debug_addr, (char *) &debug_copy, | |
1843 | sizeof (debug_copy)); | |
1844 | if (j) | |
c5aa993b | 1845 | return; /* unreadable */ |
c906108c SS |
1846 | |
1847 | /* Get common symbol definitions for the loaded object. */ | |
1848 | ||
1849 | if (debug_copy.ldd_cp) | |
1850 | { | |
1851 | solib_add_common_symbols (debug_copy.ldd_cp); | |
1852 | } | |
1853 | ||
c5aa993b | 1854 | #endif /* !SVR4_SHARED_LIBS */ |
c906108c SS |
1855 | } |
1856 | ||
1857 | ||
1858 | /* | |
1859 | ||
c5aa993b | 1860 | LOCAL FUNCTION |
c906108c | 1861 | |
c5aa993b | 1862 | sharedlibrary_command -- handle command to explicitly add library |
c906108c | 1863 | |
c5aa993b | 1864 | SYNOPSIS |
c906108c | 1865 | |
c5aa993b | 1866 | static void sharedlibrary_command (char *args, int from_tty) |
c906108c | 1867 | |
c5aa993b | 1868 | DESCRIPTION |
c906108c | 1869 | |
c5aa993b | 1870 | */ |
c906108c SS |
1871 | |
1872 | static void | |
1873 | sharedlibrary_command (args, from_tty) | |
c5aa993b JM |
1874 | char *args; |
1875 | int from_tty; | |
c906108c SS |
1876 | { |
1877 | dont_repeat (); | |
1878 | solib_add (args, from_tty, (struct target_ops *) 0); | |
1879 | } | |
1880 | ||
1881 | #endif /* HAVE_LINK_H */ | |
1882 | ||
1883 | void | |
c5aa993b | 1884 | _initialize_solib () |
c906108c SS |
1885 | { |
1886 | #ifdef HAVE_LINK_H | |
1887 | ||
1888 | add_com ("sharedlibrary", class_files, sharedlibrary_command, | |
1889 | "Load shared object library symbols for files matching REGEXP."); | |
c5aa993b | 1890 | add_info ("sharedlibrary", info_sharedlibrary_command, |
c906108c SS |
1891 | "Status of loaded shared object libraries."); |
1892 | ||
1893 | add_show_from_set | |
1894 | (add_set_cmd ("auto-solib-add", class_support, var_zinteger, | |
1895 | (char *) &auto_solib_add, | |
1896 | "Set autoloading of shared library symbols.\n\ | |
1897 | If nonzero, symbols from all shared object libraries will be loaded\n\ | |
1898 | automatically when the inferior begins execution or when the dynamic linker\n\ | |
1899 | informs gdb that a new library has been loaded. Otherwise, symbols\n\ | |
1900 | must be loaded manually, using `sharedlibrary'.", | |
1901 | &setlist), | |
1902 | &showlist); | |
1903 | ||
1904 | add_show_from_set | |
1905 | (add_set_cmd ("solib-absolute-prefix", class_support, var_filename, | |
1906 | (char *) &solib_absolute_prefix, | |
1907 | "Set prefix for loading absolute shared library symbol files.\n\ | |
1908 | For other (relative) files, you can add values using `set solib-search-path'.", | |
1909 | &setlist), | |
1910 | &showlist); | |
1911 | add_show_from_set | |
1912 | (add_set_cmd ("solib-search-path", class_support, var_string, | |
1913 | (char *) &solib_search_path, | |
1914 | "Set the search path for loading non-absolute shared library symbol files.\n\ | |
1915 | This takes precedence over the environment variables PATH and LD_LIBRARY_PATH.", | |
1916 | &setlist), | |
1917 | &showlist); | |
1918 | ||
1919 | #endif /* HAVE_LINK_H */ | |
1920 | } |