Commit | Line | Data |
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f8b76e70 | 1 | /* Handle SunOS and SVR4 shared libraries for GDB, the GNU Debugger. |
7d0a3fc8 | 2 | Copyright 1990, 1991, 1992, 1993, 1994, 1995, 1996, 1998 |
1a494973 | 3 | Free Software Foundation, Inc. |
f8b76e70 | 4 | |
bd5635a1 RP |
5 | This file is part of GDB. |
6 | ||
bdbd5f50 | 7 | This program is free software; you can redistribute it and/or modify |
bd5635a1 | 8 | it under the terms of the GNU General Public License as published by |
bdbd5f50 JG |
9 | the Free Software Foundation; either version 2 of the License, or |
10 | (at your option) any later version. | |
bd5635a1 | 11 | |
bdbd5f50 | 12 | This program is distributed in the hope that it will be useful, |
bd5635a1 RP |
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 | |
bdbd5f50 | 18 | along with this program; if not, write to the Free Software |
2858b1f2 | 19 | Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA. */ |
bd5635a1 | 20 | |
f8b76e70 | 21 | |
b0246b3b FF |
22 | #include "defs.h" |
23 | ||
ace4b8d7 FF |
24 | /* This file is only compilable if link.h is available. */ |
25 | ||
26 | #ifdef HAVE_LINK_H | |
27 | ||
bd5635a1 | 28 | #include <sys/types.h> |
f8b76e70 | 29 | #include <signal.h> |
2b576293 | 30 | #include "gdb_string.h" |
d0237a54 JK |
31 | #include <sys/param.h> |
32 | #include <fcntl.h> | |
1a494973 | 33 | #include <unistd.h> |
be772100 JG |
34 | |
35 | #ifndef SVR4_SHARED_LIBS | |
36 | /* SunOS shared libs need the nlist structure. */ | |
37 | #include <a.out.h> | |
2fe3b329 | 38 | #else |
1a494973 | 39 | #include "elf/external.h" |
be772100 | 40 | #endif |
f8b76e70 | 41 | |
1a494973 C |
42 | #include <link.h> |
43 | ||
bd5635a1 | 44 | #include "symtab.h" |
b0246b3b FF |
45 | #include "bfd.h" |
46 | #include "symfile.h" | |
be772100 | 47 | #include "objfiles.h" |
bd5635a1 RP |
48 | #include "gdbcore.h" |
49 | #include "command.h" | |
b3fdaf3d | 50 | #include "target.h" |
2403f49b | 51 | #include "frame.h" |
464c6c5f | 52 | #include "gnu-regex.h" |
bdbd5f50 | 53 | #include "inferior.h" |
6047ab6a | 54 | #include "environ.h" |
a71c0593 | 55 | #include "language.h" |
1a494973 | 56 | #include "gdbcmd.h" |
bdbd5f50 | 57 | |
2858b1f2 | 58 | #define MAX_PATH_SIZE 512 /* FIXME: Should be dynamic */ |
f8b76e70 | 59 | |
464c6c5f JL |
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 | |
69 | static char *solib_break_names[] = { | |
70 | "r_debug_state", | |
a404ea25 | 71 | "_r_debug_state", |
464c6c5f | 72 | "_dl_debug_state", |
7d0a3fc8 | 73 | "rtld_db_dlactivity", |
464c6c5f JL |
74 | NULL |
75 | }; | |
76 | #endif | |
f8b76e70 | 77 | |
a608f919 FF |
78 | #define BKPT_AT_SYMBOL 1 |
79 | ||
a71c0593 | 80 | #if defined (BKPT_AT_SYMBOL) && defined (SVR4_SHARED_LIBS) |
a608f919 FF |
81 | static char *bkpt_names[] = { |
82 | #ifdef SOLIB_BKPT_NAME | |
83 | SOLIB_BKPT_NAME, /* Prefer configured name if it exists. */ | |
84 | #endif | |
85 | "_start", | |
86 | "main", | |
87 | NULL | |
88 | }; | |
a71c0593 | 89 | #endif |
f8b76e70 | 90 | |
4ad0021e JK |
91 | /* Symbols which are used to locate the base of the link map structures. */ |
92 | ||
2fe3b329 | 93 | #ifndef SVR4_SHARED_LIBS |
4ad0021e | 94 | static char *debug_base_symbols[] = { |
2fe3b329 | 95 | "_DYNAMIC", |
1a494973 | 96 | "_DYNAMIC__MGC", |
4ad0021e JK |
97 | NULL |
98 | }; | |
2fe3b329 | 99 | #endif |
4ad0021e | 100 | |
1a494973 C |
101 | static char *main_name_list[] = { |
102 | "main_$main", | |
103 | NULL | |
104 | }; | |
105 | ||
f8b76e70 FF |
106 | /* local data declarations */ |
107 | ||
d261ece7 | 108 | #ifndef SVR4_SHARED_LIBS |
f8b76e70 | 109 | |
f8b76e70 FF |
110 | #define LM_ADDR(so) ((so) -> lm.lm_addr) |
111 | #define LM_NEXT(so) ((so) -> lm.lm_next) | |
112 | #define LM_NAME(so) ((so) -> lm.lm_name) | |
4ad0021e JK |
113 | /* Test for first link map entry; first entry is a shared library. */ |
114 | #define IGNORE_FIRST_LINK_MAP_ENTRY(x) (0) | |
f8b76e70 FF |
115 | static struct link_dynamic dynamic_copy; |
116 | static struct link_dynamic_2 ld_2_copy; | |
117 | static struct ld_debug debug_copy; | |
118 | static CORE_ADDR debug_addr; | |
119 | static CORE_ADDR flag_addr; | |
120 | ||
d261ece7 | 121 | #else /* SVR4_SHARED_LIBS */ |
f8b76e70 | 122 | |
f8b76e70 FF |
123 | #define LM_ADDR(so) ((so) -> lm.l_addr) |
124 | #define LM_NEXT(so) ((so) -> lm.l_next) | |
125 | #define LM_NAME(so) ((so) -> lm.l_name) | |
4ad0021e JK |
126 | /* Test for first link map entry; first entry is the exec-file. */ |
127 | #define IGNORE_FIRST_LINK_MAP_ENTRY(x) ((x).l_prev == NULL) | |
f8b76e70 | 128 | static struct r_debug debug_copy; |
f8b76e70 | 129 | char shadow_contents[BREAKPOINT_MAX]; /* Stash old bkpt addr contents */ |
f8b76e70 | 130 | |
d261ece7 | 131 | #endif /* !SVR4_SHARED_LIBS */ |
bd5635a1 | 132 | |
bd5635a1 | 133 | struct so_list { |
f8b76e70 FF |
134 | struct so_list *next; /* next structure in linked list */ |
135 | struct link_map lm; /* copy of link map from inferior */ | |
136 | struct link_map *lmaddr; /* addr in inferior lm was read from */ | |
137 | CORE_ADDR lmend; /* upper addr bound of mapped object */ | |
138 | char so_name[MAX_PATH_SIZE]; /* shared object lib name (FIXME) */ | |
139 | char symbols_loaded; /* flag: symbols read in yet? */ | |
140 | char from_tty; /* flag: print msgs? */ | |
b0246b3b | 141 | struct objfile *objfile; /* objfile for loaded lib */ |
f8b76e70 FF |
142 | struct section_table *sections; |
143 | struct section_table *sections_end; | |
51b57ded | 144 | struct section_table *textsection; |
a71c0593 | 145 | bfd *abfd; |
bd5635a1 RP |
146 | }; |
147 | ||
f8b76e70 FF |
148 | static struct so_list *so_list_head; /* List of known shared objects */ |
149 | static CORE_ADDR debug_base; /* Base of dynamic linker structures */ | |
150 | static CORE_ADDR breakpoint_addr; /* Address where end bkpt is set */ | |
151 | ||
7d0a3fc8 DT |
152 | static int solib_cleanup_queued = 0; /* make_run_cleanup called */ |
153 | ||
51b57ded FF |
154 | extern int |
155 | fdmatch PARAMS ((int, int)); /* In libiberty */ | |
156 | ||
b0246b3b FF |
157 | /* Local function prototypes */ |
158 | ||
7d0a3fc8 DT |
159 | static void |
160 | do_clear_solib PARAMS ((PTR)); | |
161 | ||
162 | static int | |
163 | match_main PARAMS ((char *)); | |
164 | ||
b0246b3b FF |
165 | static void |
166 | special_symbol_handling PARAMS ((struct so_list *)); | |
167 | ||
168 | static void | |
169 | sharedlibrary_command PARAMS ((char *, int)); | |
170 | ||
171 | static int | |
172 | enable_break PARAMS ((void)); | |
173 | ||
b0246b3b | 174 | static void |
51b57ded | 175 | info_sharedlibrary_command PARAMS ((char *, int)); |
b0246b3b FF |
176 | |
177 | static int | |
178 | symbol_add_stub PARAMS ((char *)); | |
179 | ||
180 | static struct so_list * | |
181 | find_solib PARAMS ((struct so_list *)); | |
182 | ||
183 | static struct link_map * | |
184 | first_link_map_member PARAMS ((void)); | |
185 | ||
186 | static CORE_ADDR | |
187 | locate_base PARAMS ((void)); | |
188 | ||
be772100 JG |
189 | static void |
190 | solib_map_sections PARAMS ((struct so_list *)); | |
191 | ||
192 | #ifdef SVR4_SHARED_LIBS | |
193 | ||
b0246b3b | 194 | static CORE_ADDR |
2fe3b329 | 195 | elf_locate_base PARAMS ((void)); |
b0246b3b | 196 | |
be772100 | 197 | #else |
b0246b3b | 198 | |
ace4b8d7 FF |
199 | static int |
200 | disable_break PARAMS ((void)); | |
201 | ||
b0246b3b | 202 | static void |
1a494973 C |
203 | allocate_rt_common_objfile PARAMS ((void)); |
204 | ||
205 | static void | |
206 | solib_add_common_symbols PARAMS ((struct rtc_symb *)); | |
b0246b3b FF |
207 | |
208 | #endif | |
bd5635a1 | 209 | |
76420d46 SG |
210 | /* If non-zero, this is a prefix that will be added to the front of the name |
211 | shared libraries with an absolute filename for loading. */ | |
212 | static char *solib_absolute_prefix = NULL; | |
213 | ||
214 | /* If non-empty, this is a search path for loading non-absolute shared library | |
215 | symbol files. This takes precedence over the environment variables PATH | |
216 | and LD_LIBRARY_PATH. */ | |
217 | static char *solib_search_path = NULL; | |
218 | ||
d0237a54 | 219 | /* |
f8b76e70 FF |
220 | |
221 | LOCAL FUNCTION | |
222 | ||
223 | solib_map_sections -- open bfd and build sections for shared lib | |
224 | ||
225 | SYNOPSIS | |
226 | ||
227 | static void solib_map_sections (struct so_list *so) | |
228 | ||
229 | DESCRIPTION | |
230 | ||
231 | Given a pointer to one of the shared objects in our list | |
232 | of mapped objects, use the recorded name to open a bfd | |
233 | descriptor for the object, build a section table, and then | |
234 | relocate all the section addresses by the base address at | |
235 | which the shared object was mapped. | |
236 | ||
237 | FIXMES | |
238 | ||
239 | In most (all?) cases the shared object file name recorded in the | |
240 | dynamic linkage tables will be a fully qualified pathname. For | |
241 | cases where it isn't, do we really mimic the systems search | |
242 | mechanism correctly in the below code (particularly the tilde | |
243 | expansion stuff?). | |
244 | */ | |
245 | ||
d0237a54 | 246 | static void |
f8b76e70 FF |
247 | solib_map_sections (so) |
248 | struct so_list *so; | |
d0237a54 JK |
249 | { |
250 | char *filename; | |
251 | char *scratch_pathname; | |
252 | int scratch_chan; | |
253 | struct section_table *p; | |
de9bef49 JG |
254 | struct cleanup *old_chain; |
255 | bfd *abfd; | |
d0237a54 | 256 | |
f8b76e70 | 257 | filename = tilde_expand (so -> so_name); |
d0237a54 | 258 | |
76420d46 SG |
259 | if (solib_absolute_prefix && ROOTED_P (filename)) |
260 | /* Prefix shared libraries with absolute filenames with | |
261 | SOLIB_ABSOLUTE_PREFIX. */ | |
262 | { | |
263 | char *pfxed_fn; | |
264 | int pfx_len; | |
265 | ||
266 | pfx_len = strlen (solib_absolute_prefix); | |
267 | ||
268 | /* Remove trailing slashes. */ | |
269 | while (pfx_len > 0 && SLASH_P (solib_absolute_prefix[pfx_len - 1])) | |
270 | pfx_len--; | |
271 | ||
272 | pfxed_fn = xmalloc (pfx_len + strlen (filename) + 1); | |
273 | strcpy (pfxed_fn, solib_absolute_prefix); | |
274 | strcat (pfxed_fn, filename); | |
275 | free (filename); | |
276 | ||
277 | filename = pfxed_fn; | |
278 | } | |
279 | ||
280 | old_chain = make_cleanup (free, filename); | |
281 | ||
282 | scratch_chan = -1; | |
283 | ||
284 | if (solib_search_path) | |
285 | scratch_chan = openp (solib_search_path, | |
286 | 1, filename, O_RDONLY, 0, &scratch_pathname); | |
287 | if (scratch_chan < 0) | |
288 | scratch_chan = openp (get_in_environ (inferior_environ, "PATH"), | |
289 | 1, filename, O_RDONLY, 0, &scratch_pathname); | |
d0237a54 | 290 | if (scratch_chan < 0) |
f8b76e70 | 291 | { |
6047ab6a KH |
292 | scratch_chan = openp (get_in_environ |
293 | (inferior_environ, "LD_LIBRARY_PATH"), | |
294 | 1, filename, O_RDONLY, 0, &scratch_pathname); | |
f8b76e70 | 295 | } |
d0237a54 | 296 | if (scratch_chan < 0) |
f8b76e70 FF |
297 | { |
298 | perror_with_name (filename); | |
a608f919 | 299 | } |
a71c0593 | 300 | /* Leave scratch_pathname allocated. abfd->name will point to it. */ |
f8b76e70 | 301 | |
a71c0593 | 302 | abfd = bfd_fdopenr (scratch_pathname, gnutarget, scratch_chan); |
de9bef49 | 303 | if (!abfd) |
f8b76e70 | 304 | { |
de9bef49 | 305 | close (scratch_chan); |
f8b76e70 | 306 | error ("Could not open `%s' as an executable file: %s", |
4ad0021e | 307 | scratch_pathname, bfd_errmsg (bfd_get_error ())); |
f8b76e70 | 308 | } |
a608f919 | 309 | /* Leave bfd open, core_xfer_memory and "info files" need it. */ |
a71c0593 | 310 | so -> abfd = abfd; |
a608f919 | 311 | abfd -> cacheable = true; |
de9bef49 | 312 | |
2858b1f2 KH |
313 | /* copy full path name into so_name, so that later symbol_file_add can find |
314 | it */ | |
315 | if (strlen (scratch_pathname) >= MAX_PATH_SIZE) | |
316 | error ("Full path name length of shared library exceeds MAX_PATH_SIZE in so_list structure."); | |
317 | strcpy (so->so_name, scratch_pathname); | |
318 | ||
de9bef49 | 319 | if (!bfd_check_format (abfd, bfd_object)) |
f8b76e70 FF |
320 | { |
321 | error ("\"%s\": not in executable format: %s.", | |
4ad0021e | 322 | scratch_pathname, bfd_errmsg (bfd_get_error ())); |
f8b76e70 | 323 | } |
de9bef49 | 324 | if (build_section_table (abfd, &so -> sections, &so -> sections_end)) |
f8b76e70 FF |
325 | { |
326 | error ("Can't find the file sections in `%s': %s", | |
2fe3b329 | 327 | bfd_get_filename (abfd), bfd_errmsg (bfd_get_error ())); |
f8b76e70 FF |
328 | } |
329 | ||
330 | for (p = so -> sections; p < so -> sections_end; p++) | |
331 | { | |
332 | /* Relocate the section binding addresses as recorded in the shared | |
333 | object's file by the base address to which the object was actually | |
334 | mapped. */ | |
335 | p -> addr += (CORE_ADDR) LM_ADDR (so); | |
336 | p -> endaddr += (CORE_ADDR) LM_ADDR (so); | |
337 | so -> lmend = (CORE_ADDR) max (p -> endaddr, so -> lmend); | |
2fe3b329 | 338 | if (STREQ (p -> the_bfd_section -> name, ".text")) |
51b57ded FF |
339 | { |
340 | so -> textsection = p; | |
341 | } | |
f8b76e70 | 342 | } |
de9bef49 JG |
343 | |
344 | /* Free the file names, close the file now. */ | |
345 | do_cleanups (old_chain); | |
f8b76e70 FF |
346 | } |
347 | ||
7f435241 FF |
348 | #ifndef SVR4_SHARED_LIBS |
349 | ||
1a494973 C |
350 | /* Allocate the runtime common object file. */ |
351 | ||
352 | static void | |
353 | allocate_rt_common_objfile () | |
354 | { | |
355 | struct objfile *objfile; | |
356 | struct objfile *last_one; | |
357 | ||
358 | objfile = (struct objfile *) xmalloc (sizeof (struct objfile)); | |
359 | memset (objfile, 0, sizeof (struct objfile)); | |
360 | objfile -> md = NULL; | |
464c6c5f JL |
361 | obstack_specify_allocation (&objfile -> psymbol_cache.cache, 0, 0, |
362 | xmalloc, free); | |
1a494973 C |
363 | obstack_specify_allocation (&objfile -> psymbol_obstack, 0, 0, xmalloc, |
364 | free); | |
365 | obstack_specify_allocation (&objfile -> symbol_obstack, 0, 0, xmalloc, | |
366 | free); | |
367 | obstack_specify_allocation (&objfile -> type_obstack, 0, 0, xmalloc, | |
368 | free); | |
369 | objfile -> name = mstrsave (objfile -> md, "rt_common"); | |
370 | ||
371 | /* Add this file onto the tail of the linked list of other such files. */ | |
372 | ||
373 | objfile -> next = NULL; | |
374 | if (object_files == NULL) | |
375 | object_files = objfile; | |
376 | else | |
377 | { | |
378 | for (last_one = object_files; | |
379 | last_one -> next; | |
380 | last_one = last_one -> next); | |
381 | last_one -> next = objfile; | |
382 | } | |
383 | ||
384 | rt_common_objfile = objfile; | |
385 | } | |
2a4e8cc3 | 386 | |
1a494973 C |
387 | /* Read all dynamically loaded common symbol definitions from the inferior |
388 | and put them into the minimal symbol table for the runtime common | |
389 | objfile. */ | |
2a4e8cc3 | 390 | |
d261ece7 | 391 | static void |
1a494973 | 392 | solib_add_common_symbols (rtc_symp) |
d261ece7 SG |
393 | struct rtc_symb *rtc_symp; |
394 | { | |
395 | struct rtc_symb inferior_rtc_symb; | |
396 | struct nlist inferior_rtc_nlist; | |
b0246b3b FF |
397 | int len; |
398 | char *name; | |
d261ece7 | 399 | |
1a494973 C |
400 | /* Remove any runtime common symbols from previous runs. */ |
401 | ||
402 | if (rt_common_objfile != NULL && rt_common_objfile -> minimal_symbol_count) | |
403 | { | |
404 | obstack_free (&rt_common_objfile -> symbol_obstack, 0); | |
405 | obstack_specify_allocation (&rt_common_objfile -> symbol_obstack, 0, 0, | |
406 | xmalloc, free); | |
407 | rt_common_objfile -> minimal_symbol_count = 0; | |
408 | rt_common_objfile -> msymbols = NULL; | |
409 | } | |
410 | ||
b0246b3b FF |
411 | init_minimal_symbol_collection (); |
412 | make_cleanup (discard_minimal_symbols, 0); | |
d261ece7 SG |
413 | |
414 | while (rtc_symp) | |
415 | { | |
b0246b3b FF |
416 | read_memory ((CORE_ADDR) rtc_symp, |
417 | (char *) &inferior_rtc_symb, | |
418 | sizeof (inferior_rtc_symb)); | |
419 | read_memory ((CORE_ADDR) inferior_rtc_symb.rtc_sp, | |
420 | (char *) &inferior_rtc_nlist, | |
421 | sizeof(inferior_rtc_nlist)); | |
422 | if (inferior_rtc_nlist.n_type == N_COMM) | |
423 | { | |
424 | /* FIXME: The length of the symbol name is not available, but in the | |
425 | current implementation the common symbol is allocated immediately | |
426 | behind the name of the symbol. */ | |
427 | len = inferior_rtc_nlist.n_value - inferior_rtc_nlist.n_un.n_strx; | |
428 | ||
ace4b8d7 | 429 | name = xmalloc (len); |
b0246b3b FF |
430 | read_memory ((CORE_ADDR) inferior_rtc_nlist.n_un.n_name, name, len); |
431 | ||
1a494973 C |
432 | /* Allocate the runtime common objfile if necessary. */ |
433 | if (rt_common_objfile == NULL) | |
434 | allocate_rt_common_objfile (); | |
d261ece7 | 435 | |
1a494973 C |
436 | prim_record_minimal_symbol (name, inferior_rtc_nlist.n_value, |
437 | mst_bss, rt_common_objfile); | |
ace4b8d7 | 438 | free (name); |
b0246b3b FF |
439 | } |
440 | rtc_symp = inferior_rtc_symb.rtc_next; | |
d261ece7 SG |
441 | } |
442 | ||
b0246b3b | 443 | /* Install any minimal symbols that have been collected as the current |
1a494973 | 444 | minimal symbols for the runtime common objfile. */ |
b0246b3b | 445 | |
1a494973 | 446 | install_minimal_symbols (rt_common_objfile); |
d261ece7 SG |
447 | } |
448 | ||
7f435241 FF |
449 | #endif /* SVR4_SHARED_LIBS */ |
450 | ||
2fe3b329 | 451 | |
be772100 JG |
452 | #ifdef SVR4_SHARED_LIBS |
453 | ||
54d478cd PS |
454 | static CORE_ADDR |
455 | bfd_lookup_symbol PARAMS ((bfd *, char *)); | |
456 | ||
457 | /* | |
458 | ||
459 | LOCAL FUNCTION | |
460 | ||
461 | bfd_lookup_symbol -- lookup the value for a specific symbol | |
462 | ||
463 | SYNOPSIS | |
464 | ||
465 | CORE_ADDR bfd_lookup_symbol (bfd *abfd, char *symname) | |
466 | ||
467 | DESCRIPTION | |
468 | ||
469 | An expensive way to lookup the value of a single symbol for | |
470 | bfd's that are only temporary anyway. This is used by the | |
471 | shared library support to find the address of the debugger | |
472 | interface structures in the shared library. | |
473 | ||
474 | Note that 0 is specifically allowed as an error return (no | |
475 | such symbol). | |
476 | */ | |
477 | ||
478 | static CORE_ADDR | |
479 | bfd_lookup_symbol (abfd, symname) | |
480 | bfd *abfd; | |
481 | char *symname; | |
482 | { | |
483 | unsigned int storage_needed; | |
484 | asymbol *sym; | |
485 | asymbol **symbol_table; | |
486 | unsigned int number_of_symbols; | |
487 | unsigned int i; | |
488 | struct cleanup *back_to; | |
489 | CORE_ADDR symaddr = 0; | |
490 | ||
491 | storage_needed = bfd_get_symtab_upper_bound (abfd); | |
492 | ||
493 | if (storage_needed > 0) | |
494 | { | |
495 | symbol_table = (asymbol **) xmalloc (storage_needed); | |
496 | back_to = make_cleanup (free, (PTR)symbol_table); | |
497 | number_of_symbols = bfd_canonicalize_symtab (abfd, symbol_table); | |
498 | ||
499 | for (i = 0; i < number_of_symbols; i++) | |
500 | { | |
501 | sym = *symbol_table++; | |
502 | if (STREQ (sym -> name, symname)) | |
503 | { | |
504 | /* Bfd symbols are section relative. */ | |
505 | symaddr = sym -> value + sym -> section -> vma; | |
506 | break; | |
507 | } | |
508 | } | |
509 | do_cleanups (back_to); | |
510 | } | |
511 | return (symaddr); | |
512 | } | |
513 | ||
a404ea25 JL |
514 | #ifdef HANDLE_SVR4_EXEC_EMULATORS |
515 | ||
516 | /* | |
517 | Solaris BCP (the part of Solaris which allows it to run SunOS4 | |
518 | a.out files) throws in another wrinkle. Solaris does not fill | |
519 | in the usual a.out link map structures when running BCP programs, | |
520 | the only way to get at them is via groping around in the dynamic | |
521 | linker. | |
522 | The dynamic linker and it's structures are located in the shared | |
523 | C library, which gets run as the executable's "interpreter" by | |
524 | the kernel. | |
525 | ||
526 | Note that we can assume nothing about the process state at the time | |
527 | we need to find these structures. We may be stopped on the first | |
528 | instruction of the interpreter (C shared library), the first | |
529 | instruction of the executable itself, or somewhere else entirely | |
530 | (if we attached to the process for example). | |
531 | */ | |
532 | ||
533 | static char *debug_base_symbols[] = { | |
534 | "r_debug", /* Solaris 2.3 */ | |
535 | "_r_debug", /* Solaris 2.1, 2.2 */ | |
536 | NULL | |
537 | }; | |
538 | ||
539 | static int | |
540 | look_for_base PARAMS ((int, CORE_ADDR)); | |
541 | ||
54d478cd PS |
542 | /* |
543 | ||
544 | LOCAL FUNCTION | |
545 | ||
546 | look_for_base -- examine file for each mapped address segment | |
547 | ||
548 | SYNOPSYS | |
549 | ||
550 | static int look_for_base (int fd, CORE_ADDR baseaddr) | |
551 | ||
552 | DESCRIPTION | |
553 | ||
554 | This function is passed to proc_iterate_over_mappings, which | |
555 | causes it to get called once for each mapped address space, with | |
556 | an open file descriptor for the file mapped to that space, and the | |
557 | base address of that mapped space. | |
558 | ||
559 | Our job is to find the debug base symbol in the file that this | |
560 | fd is open on, if it exists, and if so, initialize the dynamic | |
561 | linker structure base address debug_base. | |
562 | ||
563 | Note that this is a computationally expensive proposition, since | |
564 | we basically have to open a bfd on every call, so we specifically | |
565 | avoid opening the exec file. | |
566 | */ | |
567 | ||
568 | static int | |
569 | look_for_base (fd, baseaddr) | |
570 | int fd; | |
571 | CORE_ADDR baseaddr; | |
572 | { | |
573 | bfd *interp_bfd; | |
574 | CORE_ADDR address = 0; | |
575 | char **symbolp; | |
576 | ||
577 | /* If the fd is -1, then there is no file that corresponds to this | |
578 | mapped memory segment, so skip it. Also, if the fd corresponds | |
579 | to the exec file, skip it as well. */ | |
580 | ||
581 | if (fd == -1 | |
582 | || (exec_bfd != NULL | |
583 | && fdmatch (fileno ((GDB_FILE *)(exec_bfd -> iostream)), fd))) | |
584 | { | |
585 | return (0); | |
586 | } | |
587 | ||
588 | /* Try to open whatever random file this fd corresponds to. Note that | |
589 | we have no way currently to find the filename. Don't gripe about | |
590 | any problems we might have, just fail. */ | |
591 | ||
592 | if ((interp_bfd = bfd_fdopenr ("unnamed", gnutarget, fd)) == NULL) | |
593 | { | |
594 | return (0); | |
595 | } | |
596 | if (!bfd_check_format (interp_bfd, bfd_object)) | |
597 | { | |
1a494973 C |
598 | /* FIXME-leak: on failure, might not free all memory associated with |
599 | interp_bfd. */ | |
54d478cd PS |
600 | bfd_close (interp_bfd); |
601 | return (0); | |
602 | } | |
603 | ||
604 | /* Now try to find our debug base symbol in this file, which we at | |
605 | least know to be a valid ELF executable or shared library. */ | |
606 | ||
607 | for (symbolp = debug_base_symbols; *symbolp != NULL; symbolp++) | |
608 | { | |
609 | address = bfd_lookup_symbol (interp_bfd, *symbolp); | |
610 | if (address != 0) | |
611 | { | |
612 | break; | |
613 | } | |
614 | } | |
615 | if (address == 0) | |
616 | { | |
1a494973 C |
617 | /* FIXME-leak: on failure, might not free all memory associated with |
618 | interp_bfd. */ | |
54d478cd PS |
619 | bfd_close (interp_bfd); |
620 | return (0); | |
621 | } | |
622 | ||
623 | /* Eureka! We found the symbol. But now we may need to relocate it | |
624 | by the base address. If the symbol's value is less than the base | |
625 | address of the shared library, then it hasn't yet been relocated | |
626 | by the dynamic linker, and we have to do it ourself. FIXME: Note | |
627 | that we make the assumption that the first segment that corresponds | |
628 | to the shared library has the base address to which the library | |
629 | was relocated. */ | |
630 | ||
631 | if (address < baseaddr) | |
632 | { | |
633 | address += baseaddr; | |
634 | } | |
635 | debug_base = address; | |
1a494973 C |
636 | /* FIXME-leak: on failure, might not free all memory associated with |
637 | interp_bfd. */ | |
54d478cd PS |
638 | bfd_close (interp_bfd); |
639 | return (1); | |
640 | } | |
641 | #endif /* HANDLE_SVR4_EXEC_EMULATORS */ | |
642 | ||
f8b76e70 FF |
643 | /* |
644 | ||
645 | LOCAL FUNCTION | |
646 | ||
2fe3b329 PS |
647 | elf_locate_base -- locate the base address of dynamic linker structs |
648 | for SVR4 elf targets. | |
f8b76e70 FF |
649 | |
650 | SYNOPSIS | |
651 | ||
2fe3b329 | 652 | CORE_ADDR elf_locate_base (void) |
f8b76e70 FF |
653 | |
654 | DESCRIPTION | |
655 | ||
2fe3b329 PS |
656 | For SVR4 elf targets the address of the dynamic linker's runtime |
657 | structure is contained within the dynamic info section in the | |
658 | executable file. The dynamic section is also mapped into the | |
659 | inferior address space. Because the runtime loader fills in the | |
660 | real address before starting the inferior, we have to read in the | |
661 | dynamic info section from the inferior address space. | |
662 | If there are any errors while trying to find the address, we | |
663 | silently return 0, otherwise the found address is returned. | |
f8b76e70 | 664 | |
2fe3b329 | 665 | */ |
f8b76e70 FF |
666 | |
667 | static CORE_ADDR | |
2fe3b329 | 668 | elf_locate_base () |
f8b76e70 | 669 | { |
1a494973 | 670 | sec_ptr dyninfo_sect; |
2fe3b329 PS |
671 | int dyninfo_sect_size; |
672 | CORE_ADDR dyninfo_addr; | |
673 | char *buf; | |
674 | char *bufend; | |
675 | ||
676 | /* Find the start address of the .dynamic section. */ | |
1a494973 | 677 | dyninfo_sect = bfd_get_section_by_name (exec_bfd, ".dynamic"); |
2fe3b329 PS |
678 | if (dyninfo_sect == NULL) |
679 | return 0; | |
1a494973 | 680 | dyninfo_addr = bfd_section_vma (exec_bfd, dyninfo_sect); |
2fe3b329 PS |
681 | |
682 | /* Read in .dynamic section, silently ignore errors. */ | |
1a494973 | 683 | dyninfo_sect_size = bfd_section_size (exec_bfd, dyninfo_sect); |
2fe3b329 PS |
684 | buf = alloca (dyninfo_sect_size); |
685 | if (target_read_memory (dyninfo_addr, buf, dyninfo_sect_size)) | |
686 | return 0; | |
687 | ||
688 | /* Find the DT_DEBUG entry in the the .dynamic section. | |
689 | For mips elf we look for DT_MIPS_RLD_MAP, mips elf apparently has | |
690 | no DT_DEBUG entries. */ | |
691 | /* FIXME: In lack of a 64 bit ELF ABI the following code assumes | |
692 | a 32 bit ELF ABI target. */ | |
693 | for (bufend = buf + dyninfo_sect_size; | |
694 | buf < bufend; | |
695 | buf += sizeof (Elf32_External_Dyn)) | |
f8b76e70 | 696 | { |
2fe3b329 PS |
697 | Elf32_External_Dyn *x_dynp = (Elf32_External_Dyn *)buf; |
698 | long dyn_tag; | |
699 | CORE_ADDR dyn_ptr; | |
700 | ||
701 | dyn_tag = bfd_h_get_32 (exec_bfd, (bfd_byte *) x_dynp->d_tag); | |
702 | if (dyn_tag == DT_NULL) | |
703 | break; | |
704 | else if (dyn_tag == DT_DEBUG) | |
d0237a54 | 705 | { |
2fe3b329 PS |
706 | dyn_ptr = bfd_h_get_32 (exec_bfd, (bfd_byte *) x_dynp->d_un.d_ptr); |
707 | return dyn_ptr; | |
d0237a54 | 708 | } |
1a494973 | 709 | #ifdef DT_MIPS_RLD_MAP |
2fe3b329 | 710 | else if (dyn_tag == DT_MIPS_RLD_MAP) |
4ad0021e | 711 | { |
2fe3b329 PS |
712 | char pbuf[TARGET_PTR_BIT / HOST_CHAR_BIT]; |
713 | ||
714 | /* DT_MIPS_RLD_MAP contains a pointer to the address | |
715 | of the dynamic link structure. */ | |
716 | dyn_ptr = bfd_h_get_32 (exec_bfd, (bfd_byte *) x_dynp->d_un.d_ptr); | |
717 | if (target_read_memory (dyn_ptr, pbuf, sizeof (pbuf))) | |
718 | return 0; | |
719 | return extract_unsigned_integer (pbuf, sizeof (pbuf)); | |
4ad0021e | 720 | } |
1a494973 | 721 | #endif |
4ad0021e | 722 | } |
d261ece7 | 723 | |
2fe3b329 PS |
724 | /* DT_DEBUG entry not found. */ |
725 | return 0; | |
d261ece7 SG |
726 | } |
727 | ||
2fe3b329 | 728 | #endif /* SVR4_SHARED_LIBS */ |
be772100 | 729 | |
d261ece7 SG |
730 | /* |
731 | ||
f8b76e70 FF |
732 | LOCAL FUNCTION |
733 | ||
734 | locate_base -- locate the base address of dynamic linker structs | |
735 | ||
736 | SYNOPSIS | |
737 | ||
738 | CORE_ADDR locate_base (void) | |
739 | ||
740 | DESCRIPTION | |
741 | ||
742 | For both the SunOS and SVR4 shared library implementations, if the | |
743 | inferior executable has been linked dynamically, there is a single | |
744 | address somewhere in the inferior's data space which is the key to | |
d261ece7 | 745 | locating all of the dynamic linker's runtime structures. This |
4ad0021e JK |
746 | address is the value of the debug base symbol. The job of this |
747 | function is to find and return that address, or to return 0 if there | |
748 | is no such address (the executable is statically linked for example). | |
f8b76e70 FF |
749 | |
750 | For SunOS, the job is almost trivial, since the dynamic linker and | |
751 | all of it's structures are statically linked to the executable at | |
752 | link time. Thus the symbol for the address we are looking for has | |
b0246b3b FF |
753 | already been added to the minimal symbol table for the executable's |
754 | objfile at the time the symbol file's symbols were read, and all we | |
755 | have to do is look it up there. Note that we explicitly do NOT want | |
756 | to find the copies in the shared library. | |
f8b76e70 | 757 | |
2fe3b329 PS |
758 | The SVR4 version is a bit more complicated because the address |
759 | is contained somewhere in the dynamic info section. We have to go | |
4ad0021e JK |
760 | to a lot more work to discover the address of the debug base symbol. |
761 | Because of this complexity, we cache the value we find and return that | |
762 | value on subsequent invocations. Note there is no copy in the | |
763 | executable symbol tables. | |
f8b76e70 | 764 | |
f8b76e70 FF |
765 | */ |
766 | ||
767 | static CORE_ADDR | |
768 | locate_base () | |
769 | { | |
f8b76e70 | 770 | |
d261ece7 | 771 | #ifndef SVR4_SHARED_LIBS |
f8b76e70 | 772 | |
b0246b3b | 773 | struct minimal_symbol *msymbol; |
d261ece7 | 774 | CORE_ADDR address = 0; |
4ad0021e | 775 | char **symbolp; |
f8b76e70 | 776 | |
4ad0021e JK |
777 | /* For SunOS, we want to limit the search for the debug base symbol to the |
778 | executable being debugged, since there is a duplicate named symbol in the | |
779 | shared library. We don't want the shared library versions. */ | |
b0246b3b | 780 | |
4ad0021e | 781 | for (symbolp = debug_base_symbols; *symbolp != NULL; symbolp++) |
f8b76e70 | 782 | { |
1a494973 | 783 | msymbol = lookup_minimal_symbol (*symbolp, NULL, symfile_objfile); |
4ad0021e JK |
784 | if ((msymbol != NULL) && (SYMBOL_VALUE_ADDRESS (msymbol) != 0)) |
785 | { | |
786 | address = SYMBOL_VALUE_ADDRESS (msymbol); | |
787 | return (address); | |
788 | } | |
f8b76e70 | 789 | } |
4ad0021e | 790 | return (0); |
f8b76e70 | 791 | |
d261ece7 | 792 | #else /* SVR4_SHARED_LIBS */ |
f8b76e70 | 793 | |
d261ece7 SG |
794 | /* Check to see if we have a currently valid address, and if so, avoid |
795 | doing all this work again and just return the cached address. If | |
2fe3b329 | 796 | we have no cached address, try to locate it in the dynamic info |
54d478cd | 797 | section for ELF executables. */ |
f8b76e70 | 798 | |
d261ece7 | 799 | if (debug_base == 0) |
f8b76e70 | 800 | { |
54d478cd PS |
801 | if (exec_bfd != NULL |
802 | && bfd_get_flavour (exec_bfd) == bfd_target_elf_flavour) | |
803 | debug_base = elf_locate_base (); | |
804 | #ifdef HANDLE_SVR4_EXEC_EMULATORS | |
805 | /* Try it the hard way for emulated executables. */ | |
ace4b8d7 | 806 | else if (inferior_pid != 0 && target_has_execution) |
54d478cd PS |
807 | proc_iterate_over_mappings (look_for_base); |
808 | #endif | |
f8b76e70 | 809 | } |
d261ece7 | 810 | return (debug_base); |
f8b76e70 | 811 | |
d261ece7 | 812 | #endif /* !SVR4_SHARED_LIBS */ |
f8b76e70 FF |
813 | |
814 | } | |
bd5635a1 | 815 | |
a608f919 FF |
816 | /* |
817 | ||
818 | LOCAL FUNCTION | |
819 | ||
820 | first_link_map_member -- locate first member in dynamic linker's map | |
821 | ||
822 | SYNOPSIS | |
823 | ||
824 | static struct link_map *first_link_map_member (void) | |
825 | ||
826 | DESCRIPTION | |
827 | ||
828 | Read in a copy of the first member in the inferior's dynamic | |
829 | link map from the inferior's dynamic linker structures, and return | |
830 | a pointer to the copy in our address space. | |
831 | */ | |
832 | ||
f8b76e70 FF |
833 | static struct link_map * |
834 | first_link_map_member () | |
bd5635a1 | 835 | { |
f8b76e70 FF |
836 | struct link_map *lm = NULL; |
837 | ||
d261ece7 | 838 | #ifndef SVR4_SHARED_LIBS |
f8b76e70 | 839 | |
b0246b3b | 840 | read_memory (debug_base, (char *) &dynamic_copy, sizeof (dynamic_copy)); |
f8b76e70 FF |
841 | if (dynamic_copy.ld_version >= 2) |
842 | { | |
843 | /* It is a version that we can deal with, so read in the secondary | |
844 | structure and find the address of the link map list from it. */ | |
b0246b3b | 845 | read_memory ((CORE_ADDR) dynamic_copy.ld_un.ld_2, (char *) &ld_2_copy, |
f8b76e70 FF |
846 | sizeof (struct link_dynamic_2)); |
847 | lm = ld_2_copy.ld_loaded; | |
848 | } | |
849 | ||
d261ece7 | 850 | #else /* SVR4_SHARED_LIBS */ |
f8b76e70 | 851 | |
b0246b3b | 852 | read_memory (debug_base, (char *) &debug_copy, sizeof (struct r_debug)); |
a608f919 FF |
853 | /* FIXME: Perhaps we should validate the info somehow, perhaps by |
854 | checking r_version for a known version number, or r_state for | |
855 | RT_CONSISTENT. */ | |
f8b76e70 FF |
856 | lm = debug_copy.r_map; |
857 | ||
d261ece7 | 858 | #endif /* !SVR4_SHARED_LIBS */ |
d0237a54 | 859 | |
f8b76e70 FF |
860 | return (lm); |
861 | } | |
862 | ||
863 | /* | |
864 | ||
b0246b3b | 865 | LOCAL FUNCTION |
f8b76e70 FF |
866 | |
867 | find_solib -- step through list of shared objects | |
868 | ||
869 | SYNOPSIS | |
870 | ||
871 | struct so_list *find_solib (struct so_list *so_list_ptr) | |
872 | ||
873 | DESCRIPTION | |
874 | ||
875 | This module contains the routine which finds the names of any | |
876 | loaded "images" in the current process. The argument in must be | |
877 | NULL on the first call, and then the returned value must be passed | |
878 | in on subsequent calls. This provides the capability to "step" down | |
879 | the list of loaded objects. On the last object, a NULL value is | |
880 | returned. | |
d0237a54 | 881 | |
f8b76e70 FF |
882 | The arg and return value are "struct link_map" pointers, as defined |
883 | in <link.h>. | |
884 | */ | |
d0237a54 | 885 | |
b0246b3b | 886 | static struct so_list * |
f8b76e70 FF |
887 | find_solib (so_list_ptr) |
888 | struct so_list *so_list_ptr; /* Last lm or NULL for first one */ | |
889 | { | |
890 | struct so_list *so_list_next = NULL; | |
891 | struct link_map *lm = NULL; | |
892 | struct so_list *new; | |
893 | ||
894 | if (so_list_ptr == NULL) | |
895 | { | |
896 | /* We are setting up for a new scan through the loaded images. */ | |
897 | if ((so_list_next = so_list_head) == NULL) | |
898 | { | |
899 | /* We have not already read in the dynamic linking structures | |
900 | from the inferior, lookup the address of the base structure. */ | |
901 | debug_base = locate_base (); | |
a608f919 | 902 | if (debug_base != 0) |
f8b76e70 FF |
903 | { |
904 | /* Read the base structure in and find the address of the first | |
905 | link map list member. */ | |
906 | lm = first_link_map_member (); | |
907 | } | |
908 | } | |
909 | } | |
910 | else | |
911 | { | |
912 | /* We have been called before, and are in the process of walking | |
913 | the shared library list. Advance to the next shared object. */ | |
914 | if ((lm = LM_NEXT (so_list_ptr)) == NULL) | |
915 | { | |
916 | /* We have hit the end of the list, so check to see if any were | |
917 | added, but be quiet if we can't read from the target any more. */ | |
918 | int status = target_read_memory ((CORE_ADDR) so_list_ptr -> lmaddr, | |
919 | (char *) &(so_list_ptr -> lm), | |
920 | sizeof (struct link_map)); | |
921 | if (status == 0) | |
922 | { | |
923 | lm = LM_NEXT (so_list_ptr); | |
924 | } | |
925 | else | |
926 | { | |
927 | lm = NULL; | |
928 | } | |
929 | } | |
930 | so_list_next = so_list_ptr -> next; | |
931 | } | |
932 | if ((so_list_next == NULL) && (lm != NULL)) | |
933 | { | |
934 | /* Get next link map structure from inferior image and build a local | |
935 | abbreviated load_map structure */ | |
936 | new = (struct so_list *) xmalloc (sizeof (struct so_list)); | |
de9bef49 | 937 | memset ((char *) new, 0, sizeof (struct so_list)); |
f8b76e70 FF |
938 | new -> lmaddr = lm; |
939 | /* Add the new node as the next node in the list, or as the root | |
940 | node if this is the first one. */ | |
941 | if (so_list_ptr != NULL) | |
942 | { | |
943 | so_list_ptr -> next = new; | |
944 | } | |
945 | else | |
946 | { | |
947 | so_list_head = new; | |
7d0a3fc8 DT |
948 | |
949 | if (! solib_cleanup_queued) | |
950 | { | |
951 | make_run_cleanup (do_clear_solib); | |
952 | solib_cleanup_queued = 1; | |
953 | } | |
954 | ||
f8b76e70 FF |
955 | } |
956 | so_list_next = new; | |
b0246b3b FF |
957 | read_memory ((CORE_ADDR) lm, (char *) &(new -> lm), |
958 | sizeof (struct link_map)); | |
4ad0021e JK |
959 | /* For SVR4 versions, the first entry in the link map is for the |
960 | inferior executable, so we must ignore it. For some versions of | |
961 | SVR4, it has no name. For others (Solaris 2.3 for example), it | |
962 | does have a name, so we can no longer use a missing name to | |
963 | decide when to ignore it. */ | |
964 | if (!IGNORE_FIRST_LINK_MAP_ENTRY (new -> lm)) | |
f8b76e70 | 965 | { |
4ad0021e JK |
966 | int errcode; |
967 | char *buffer; | |
968 | target_read_string ((CORE_ADDR) LM_NAME (new), &buffer, | |
969 | MAX_PATH_SIZE - 1, &errcode); | |
970 | if (errcode != 0) | |
971 | error ("find_solib: Can't read pathname for load map: %s\n", | |
972 | safe_strerror (errcode)); | |
973 | strncpy (new -> so_name, buffer, MAX_PATH_SIZE - 1); | |
974 | new -> so_name[MAX_PATH_SIZE - 1] = '\0'; | |
975 | free (buffer); | |
f8b76e70 FF |
976 | solib_map_sections (new); |
977 | } | |
978 | } | |
979 | return (so_list_next); | |
bd5635a1 | 980 | } |
d0237a54 | 981 | |
bdbd5f50 JG |
982 | /* A small stub to get us past the arg-passing pinhole of catch_errors. */ |
983 | ||
984 | static int | |
985 | symbol_add_stub (arg) | |
986 | char *arg; | |
d0237a54 | 987 | { |
f8b76e70 | 988 | register struct so_list *so = (struct so_list *) arg; /* catch_errs bogon */ |
7d0a3fc8 DT |
989 | CORE_ADDR text_addr = 0; |
990 | ||
991 | if (so -> textsection) | |
992 | text_addr = so -> textsection -> addr; | |
993 | else | |
994 | { | |
995 | asection *lowest_sect; | |
996 | ||
997 | /* If we didn't find a mapped non zero sized .text section, set up | |
998 | text_addr so that the relocation in symbol_file_add does no harm. */ | |
999 | ||
1000 | lowest_sect = bfd_get_section_by_name (so -> abfd, ".text"); | |
1001 | if (lowest_sect == NULL) | |
1002 | bfd_map_over_sections (so -> abfd, find_lowest_section, | |
1003 | (PTR) &lowest_sect); | |
1004 | if (lowest_sect) | |
1005 | text_addr = bfd_section_vma (so -> abfd, lowest_sect) | |
1006 | + (CORE_ADDR) LM_ADDR (so); | |
1007 | } | |
f8b76e70 | 1008 | |
7d0a3fc8 DT |
1009 | ALL_OBJFILES (so -> objfile) |
1010 | { | |
1011 | if (strcmp (so -> objfile -> name, so -> so_name) == 0) | |
1012 | return 1; | |
1013 | } | |
54d478cd PS |
1014 | so -> objfile = |
1015 | symbol_file_add (so -> so_name, so -> from_tty, | |
7d0a3fc8 | 1016 | text_addr, |
54d478cd | 1017 | 0, 0, 0); |
f8b76e70 | 1018 | return (1); |
d0237a54 | 1019 | } |
bd5635a1 | 1020 | |
1a494973 C |
1021 | /* This function will check the so name to see if matches the main list. |
1022 | In some system the main object is in the list, which we want to exclude */ | |
1023 | ||
1024 | static int match_main (soname) | |
1025 | char *soname; | |
1026 | { | |
2858b1f2 | 1027 | char **mainp; |
1a494973 | 1028 | |
2858b1f2 KH |
1029 | for (mainp = main_name_list; *mainp != NULL; mainp++) |
1030 | { | |
1031 | if (strcmp (soname, *mainp) == 0) | |
1a494973 | 1032 | return (1); |
2858b1f2 | 1033 | } |
1a494973 | 1034 | |
2858b1f2 | 1035 | return (0); |
1a494973 C |
1036 | } |
1037 | ||
f8b76e70 FF |
1038 | /* |
1039 | ||
1040 | GLOBAL FUNCTION | |
1041 | ||
1042 | solib_add -- add a shared library file to the symtab and section list | |
1043 | ||
1044 | SYNOPSIS | |
1045 | ||
1046 | void solib_add (char *arg_string, int from_tty, | |
1047 | struct target_ops *target) | |
1048 | ||
1049 | DESCRIPTION | |
1050 | ||
1051 | */ | |
bdbd5f50 JG |
1052 | |
1053 | void | |
1054 | solib_add (arg_string, from_tty, target) | |
1055 | char *arg_string; | |
1056 | int from_tty; | |
1057 | struct target_ops *target; | |
bd5635a1 | 1058 | { |
f8b76e70 | 1059 | register struct so_list *so = NULL; /* link map state variable */ |
a71c0593 FF |
1060 | |
1061 | /* Last shared library that we read. */ | |
1062 | struct so_list *so_last = NULL; | |
1063 | ||
f8b76e70 FF |
1064 | char *re_err; |
1065 | int count; | |
1066 | int old; | |
1067 | ||
1068 | if ((re_err = re_comp (arg_string ? arg_string : ".")) != NULL) | |
1069 | { | |
1070 | error ("Invalid regexp: %s", re_err); | |
1071 | } | |
1072 | ||
2fe3b329 | 1073 | /* Add the shared library sections to the section table of the |
54d478cd | 1074 | specified target, if any. */ |
f8b76e70 FF |
1075 | if (target) |
1076 | { | |
1077 | /* Count how many new section_table entries there are. */ | |
1078 | so = NULL; | |
1079 | count = 0; | |
1080 | while ((so = find_solib (so)) != NULL) | |
1081 | { | |
1a494973 | 1082 | if (so -> so_name[0] && !match_main (so -> so_name)) |
f8b76e70 FF |
1083 | { |
1084 | count += so -> sections_end - so -> sections; | |
1085 | } | |
1086 | } | |
1087 | ||
1088 | if (count) | |
1089 | { | |
464c6c5f JL |
1090 | int update_coreops; |
1091 | ||
1092 | /* We must update the to_sections field in the core_ops structure | |
1093 | here, otherwise we dereference a potential dangling pointer | |
1094 | for each call to target_read/write_memory within this routine. */ | |
1095 | update_coreops = core_ops.to_sections == target->to_sections; | |
1096 | ||
f8b76e70 | 1097 | /* Reallocate the target's section table including the new size. */ |
ee0613d1 | 1098 | if (target -> to_sections) |
f8b76e70 | 1099 | { |
ee0613d1 JG |
1100 | old = target -> to_sections_end - target -> to_sections; |
1101 | target -> to_sections = (struct section_table *) | |
a71c0593 | 1102 | xrealloc ((char *)target -> to_sections, |
f8b76e70 FF |
1103 | (sizeof (struct section_table)) * (count + old)); |
1104 | } | |
1105 | else | |
1106 | { | |
1107 | old = 0; | |
ee0613d1 | 1108 | target -> to_sections = (struct section_table *) |
a71c0593 | 1109 | xmalloc ((sizeof (struct section_table)) * count); |
f8b76e70 | 1110 | } |
ee0613d1 | 1111 | target -> to_sections_end = target -> to_sections + (count + old); |
f8b76e70 | 1112 | |
464c6c5f JL |
1113 | /* Update the to_sections field in the core_ops structure |
1114 | if needed. */ | |
1115 | if (update_coreops) | |
1116 | { | |
1117 | core_ops.to_sections = target->to_sections; | |
1118 | core_ops.to_sections_end = target->to_sections_end; | |
1119 | } | |
1120 | ||
f8b76e70 FF |
1121 | /* Add these section table entries to the target's table. */ |
1122 | while ((so = find_solib (so)) != NULL) | |
1123 | { | |
1124 | if (so -> so_name[0]) | |
1125 | { | |
1126 | count = so -> sections_end - so -> sections; | |
de9bef49 JG |
1127 | memcpy ((char *) (target -> to_sections + old), |
1128 | so -> sections, | |
1129 | (sizeof (struct section_table)) * count); | |
f8b76e70 FF |
1130 | old += count; |
1131 | } | |
1132 | } | |
1133 | } | |
1134 | } | |
2fe3b329 PS |
1135 | |
1136 | /* Now add the symbol files. */ | |
1137 | while ((so = find_solib (so)) != NULL) | |
1138 | { | |
1a494973 C |
1139 | if (so -> so_name[0] && re_exec (so -> so_name) && |
1140 | !match_main (so -> so_name)) | |
2fe3b329 PS |
1141 | { |
1142 | so -> from_tty = from_tty; | |
1143 | if (so -> symbols_loaded) | |
1144 | { | |
1145 | if (from_tty) | |
1146 | { | |
1147 | printf_unfiltered ("Symbols already loaded for %s\n", so -> so_name); | |
1148 | } | |
1149 | } | |
1150 | else if (catch_errors | |
1151 | (symbol_add_stub, (char *) so, | |
1152 | "Error while reading shared library symbols:\n", | |
1153 | RETURN_MASK_ALL)) | |
1154 | { | |
1155 | so_last = so; | |
1156 | so -> symbols_loaded = 1; | |
1157 | } | |
1158 | } | |
1159 | } | |
a71c0593 | 1160 | |
54d478cd PS |
1161 | /* Getting new symbols may change our opinion about what is |
1162 | frameless. */ | |
1163 | if (so_last) | |
1164 | reinit_frame_cache (); | |
1165 | ||
a71c0593 FF |
1166 | if (so_last) |
1167 | special_symbol_handling (so_last); | |
bd5635a1 | 1168 | } |
bdbd5f50 | 1169 | |
f8b76e70 | 1170 | /* |
bd5635a1 | 1171 | |
f8b76e70 FF |
1172 | LOCAL FUNCTION |
1173 | ||
1174 | info_sharedlibrary_command -- code for "info sharedlibrary" | |
1175 | ||
1176 | SYNOPSIS | |
1177 | ||
1178 | static void info_sharedlibrary_command () | |
1179 | ||
1180 | DESCRIPTION | |
bd5635a1 | 1181 | |
f8b76e70 FF |
1182 | Walk through the shared library list and print information |
1183 | about each attached library. | |
1184 | */ | |
1185 | ||
1186 | static void | |
51b57ded FF |
1187 | info_sharedlibrary_command (ignore, from_tty) |
1188 | char *ignore; | |
1189 | int from_tty; | |
f8b76e70 FF |
1190 | { |
1191 | register struct so_list *so = NULL; /* link map state variable */ | |
1192 | int header_done = 0; | |
1193 | ||
1194 | if (exec_bfd == NULL) | |
1195 | { | |
8d60affd | 1196 | printf_unfiltered ("No exec file.\n"); |
f8b76e70 FF |
1197 | return; |
1198 | } | |
1199 | while ((so = find_solib (so)) != NULL) | |
1200 | { | |
1201 | if (so -> so_name[0]) | |
1202 | { | |
1203 | if (!header_done) | |
1204 | { | |
8d60affd | 1205 | printf_unfiltered("%-12s%-12s%-12s%s\n", "From", "To", "Syms Read", |
f8b76e70 FF |
1206 | "Shared Object Library"); |
1207 | header_done++; | |
1208 | } | |
4ad0021e JK |
1209 | /* FIXME-32x64: need print_address_numeric with field width or |
1210 | some such. */ | |
8d60affd | 1211 | printf_unfiltered ("%-12s", |
a71c0593 FF |
1212 | local_hex_string_custom ((unsigned long) LM_ADDR (so), |
1213 | "08l")); | |
8d60affd | 1214 | printf_unfiltered ("%-12s", |
a71c0593 FF |
1215 | local_hex_string_custom ((unsigned long) so -> lmend, |
1216 | "08l")); | |
8d60affd JK |
1217 | printf_unfiltered ("%-12s", so -> symbols_loaded ? "Yes" : "No"); |
1218 | printf_unfiltered ("%s\n", so -> so_name); | |
bd5635a1 | 1219 | } |
bd5635a1 | 1220 | } |
f8b76e70 FF |
1221 | if (so_list_head == NULL) |
1222 | { | |
8d60affd | 1223 | printf_unfiltered ("No shared libraries loaded at this time.\n"); |
bd5635a1 RP |
1224 | } |
1225 | } | |
1226 | ||
1227 | /* | |
f8b76e70 FF |
1228 | |
1229 | GLOBAL FUNCTION | |
1230 | ||
1231 | solib_address -- check to see if an address is in a shared lib | |
1232 | ||
1233 | SYNOPSIS | |
1234 | ||
464c6c5f | 1235 | char * solib_address (CORE_ADDR address) |
f8b76e70 FF |
1236 | |
1237 | DESCRIPTION | |
1238 | ||
1239 | Provides a hook for other gdb routines to discover whether or | |
1240 | not a particular address is within the mapped address space of | |
1241 | a shared library. Any address between the base mapping address | |
1242 | and the first address beyond the end of the last mapping, is | |
1243 | considered to be within the shared library address space, for | |
1244 | our purposes. | |
1245 | ||
1246 | For example, this routine is called at one point to disable | |
1247 | breakpoints which are in shared libraries that are not currently | |
1248 | mapped in. | |
1249 | */ | |
1250 | ||
464c6c5f | 1251 | char * |
f8b76e70 | 1252 | solib_address (address) |
bd5635a1 RP |
1253 | CORE_ADDR address; |
1254 | { | |
f8b76e70 FF |
1255 | register struct so_list *so = 0; /* link map state variable */ |
1256 | ||
1257 | while ((so = find_solib (so)) != NULL) | |
1258 | { | |
1259 | if (so -> so_name[0]) | |
1260 | { | |
1261 | if ((address >= (CORE_ADDR) LM_ADDR (so)) && | |
1262 | (address < (CORE_ADDR) so -> lmend)) | |
464c6c5f | 1263 | return (so->so_name); |
f8b76e70 FF |
1264 | } |
1265 | } | |
1266 | return (0); | |
1267 | } | |
1268 | ||
1269 | /* Called by free_all_symtabs */ | |
bd5635a1 | 1270 | |
f8b76e70 FF |
1271 | void |
1272 | clear_solib() | |
1273 | { | |
1274 | struct so_list *next; | |
a608f919 | 1275 | char *bfd_filename; |
f8b76e70 FF |
1276 | |
1277 | while (so_list_head) | |
1278 | { | |
1279 | if (so_list_head -> sections) | |
1280 | { | |
be772100 | 1281 | free ((PTR)so_list_head -> sections); |
f8b76e70 | 1282 | } |
a71c0593 | 1283 | if (so_list_head -> abfd) |
a608f919 | 1284 | { |
a71c0593 | 1285 | bfd_filename = bfd_get_filename (so_list_head -> abfd); |
1a494973 C |
1286 | if (!bfd_close (so_list_head -> abfd)) |
1287 | warning ("cannot close \"%s\": %s", | |
1288 | bfd_filename, bfd_errmsg (bfd_get_error ())); | |
a608f919 FF |
1289 | } |
1290 | else | |
1291 | /* This happens for the executable on SVR4. */ | |
1292 | bfd_filename = NULL; | |
1293 | ||
f8b76e70 | 1294 | next = so_list_head -> next; |
a608f919 FF |
1295 | if (bfd_filename) |
1296 | free ((PTR)bfd_filename); | |
1297 | free ((PTR)so_list_head); | |
f8b76e70 | 1298 | so_list_head = next; |
bd5635a1 | 1299 | } |
f8b76e70 | 1300 | debug_base = 0; |
bd5635a1 RP |
1301 | } |
1302 | ||
7d0a3fc8 DT |
1303 | static void |
1304 | do_clear_solib (dummy) | |
1305 | PTR dummy; | |
1306 | { | |
1307 | solib_cleanup_queued = 0; | |
1308 | clear_solib (); | |
1309 | } | |
1310 | ||
1311 | #ifdef SVR4_SHARED_LIBS | |
1312 | ||
1313 | /* Return 1 if PC lies in the dynamic symbol resolution code of the | |
1314 | SVR4 run time loader. */ | |
1315 | ||
1316 | static CORE_ADDR interp_text_sect_low; | |
1317 | static CORE_ADDR interp_text_sect_high; | |
1318 | static CORE_ADDR interp_plt_sect_low; | |
1319 | static CORE_ADDR interp_plt_sect_high; | |
1320 | ||
1321 | int | |
1322 | in_svr4_dynsym_resolve_code (pc) | |
1323 | CORE_ADDR pc; | |
1324 | { | |
1325 | return ((pc >= interp_text_sect_low && pc < interp_text_sect_high) | |
1326 | || (pc >= interp_plt_sect_low && pc < interp_plt_sect_high) | |
1327 | || in_plt_section (pc, NULL)); | |
1328 | } | |
1329 | #endif | |
1330 | ||
bd5635a1 | 1331 | /* |
f8b76e70 FF |
1332 | |
1333 | LOCAL FUNCTION | |
1334 | ||
1335 | disable_break -- remove the "mapping changed" breakpoint | |
1336 | ||
1337 | SYNOPSIS | |
1338 | ||
1339 | static int disable_break () | |
1340 | ||
1341 | DESCRIPTION | |
1342 | ||
1343 | Removes the breakpoint that gets hit when the dynamic linker | |
1344 | completes a mapping change. | |
1345 | ||
bd5635a1 | 1346 | */ |
f8b76e70 | 1347 | |
ace4b8d7 FF |
1348 | #ifndef SVR4_SHARED_LIBS |
1349 | ||
f8b76e70 FF |
1350 | static int |
1351 | disable_break () | |
bd5635a1 | 1352 | { |
f8b76e70 FF |
1353 | int status = 1; |
1354 | ||
d261ece7 | 1355 | #ifndef SVR4_SHARED_LIBS |
f8b76e70 FF |
1356 | |
1357 | int in_debugger = 0; | |
1358 | ||
f8b76e70 FF |
1359 | /* Read the debugger structure from the inferior to retrieve the |
1360 | address of the breakpoint and the original contents of the | |
1361 | breakpoint address. Remove the breakpoint by writing the original | |
1362 | contents back. */ | |
1363 | ||
b0246b3b | 1364 | read_memory (debug_addr, (char *) &debug_copy, sizeof (debug_copy)); |
d261ece7 SG |
1365 | |
1366 | /* Set `in_debugger' to zero now. */ | |
1367 | ||
b0246b3b | 1368 | write_memory (flag_addr, (char *) &in_debugger, sizeof (in_debugger)); |
d261ece7 | 1369 | |
f8b76e70 | 1370 | breakpoint_addr = (CORE_ADDR) debug_copy.ldd_bp_addr; |
b0246b3b | 1371 | write_memory (breakpoint_addr, (char *) &debug_copy.ldd_bp_inst, |
f8b76e70 FF |
1372 | sizeof (debug_copy.ldd_bp_inst)); |
1373 | ||
d261ece7 | 1374 | #else /* SVR4_SHARED_LIBS */ |
f8b76e70 FF |
1375 | |
1376 | /* Note that breakpoint address and original contents are in our address | |
1377 | space, so we just need to write the original contents back. */ | |
1378 | ||
1379 | if (memory_remove_breakpoint (breakpoint_addr, shadow_contents) != 0) | |
1380 | { | |
1381 | status = 0; | |
1382 | } | |
1383 | ||
d261ece7 | 1384 | #endif /* !SVR4_SHARED_LIBS */ |
f8b76e70 FF |
1385 | |
1386 | /* For the SVR4 version, we always know the breakpoint address. For the | |
1387 | SunOS version we don't know it until the above code is executed. | |
1388 | Grumble if we are stopped anywhere besides the breakpoint address. */ | |
1389 | ||
1390 | if (stop_pc != breakpoint_addr) | |
1391 | { | |
1392 | warning ("stopped at unknown breakpoint while handling shared libraries"); | |
1393 | } | |
1394 | ||
1395 | return (status); | |
bdbd5f50 JG |
1396 | } |
1397 | ||
ace4b8d7 FF |
1398 | #endif /* #ifdef SVR4_SHARED_LIBS */ |
1399 | ||
f8b76e70 | 1400 | /* |
bdbd5f50 | 1401 | |
f8b76e70 FF |
1402 | LOCAL FUNCTION |
1403 | ||
1404 | enable_break -- arrange for dynamic linker to hit breakpoint | |
1405 | ||
1406 | SYNOPSIS | |
1407 | ||
1408 | int enable_break (void) | |
1409 | ||
1410 | DESCRIPTION | |
1411 | ||
1412 | Both the SunOS and the SVR4 dynamic linkers have, as part of their | |
1413 | debugger interface, support for arranging for the inferior to hit | |
1414 | a breakpoint after mapping in the shared libraries. This function | |
1415 | enables that breakpoint. | |
1416 | ||
1417 | For SunOS, there is a special flag location (in_debugger) which we | |
1418 | set to 1. When the dynamic linker sees this flag set, it will set | |
1419 | a breakpoint at a location known only to itself, after saving the | |
1420 | original contents of that place and the breakpoint address itself, | |
1421 | in it's own internal structures. When we resume the inferior, it | |
1422 | will eventually take a SIGTRAP when it runs into the breakpoint. | |
1423 | We handle this (in a different place) by restoring the contents of | |
1424 | the breakpointed location (which is only known after it stops), | |
1425 | chasing around to locate the shared libraries that have been | |
1426 | loaded, then resuming. | |
1427 | ||
1428 | For SVR4, the debugger interface structure contains a member (r_brk) | |
1429 | which is statically initialized at the time the shared library is | |
1430 | built, to the offset of a function (_r_debug_state) which is guaran- | |
1431 | teed to be called once before mapping in a library, and again when | |
1432 | the mapping is complete. At the time we are examining this member, | |
1433 | it contains only the unrelocated offset of the function, so we have | |
1434 | to do our own relocation. Later, when the dynamic linker actually | |
1435 | runs, it relocates r_brk to be the actual address of _r_debug_state(). | |
1436 | ||
1437 | The debugger interface structure also contains an enumeration which | |
1438 | is set to either RT_ADD or RT_DELETE prior to changing the mapping, | |
1439 | depending upon whether or not the library is being mapped or unmapped, | |
1440 | and then set to RT_CONSISTENT after the library is mapped/unmapped. | |
1441 | */ | |
1442 | ||
1443 | static int | |
1444 | enable_break () | |
bdbd5f50 | 1445 | { |
a608f919 | 1446 | int success = 0; |
bdbd5f50 | 1447 | |
d261ece7 | 1448 | #ifndef SVR4_SHARED_LIBS |
bdbd5f50 | 1449 | |
51b57ded | 1450 | int j; |
f8b76e70 | 1451 | int in_debugger; |
51b57ded | 1452 | |
bdbd5f50 | 1453 | /* Get link_dynamic structure */ |
f8b76e70 FF |
1454 | |
1455 | j = target_read_memory (debug_base, (char *) &dynamic_copy, | |
1456 | sizeof (dynamic_copy)); | |
1457 | if (j) | |
1458 | { | |
1459 | /* unreadable */ | |
1460 | return (0); | |
1461 | } | |
06b6c733 | 1462 | |
bdbd5f50 | 1463 | /* Calc address of debugger interface structure */ |
f8b76e70 FF |
1464 | |
1465 | debug_addr = (CORE_ADDR) dynamic_copy.ldd; | |
1466 | ||
bdbd5f50 | 1467 | /* Calc address of `in_debugger' member of debugger interface structure */ |
f8b76e70 FF |
1468 | |
1469 | flag_addr = debug_addr + (CORE_ADDR) ((char *) &debug_copy.ldd_in_debugger - | |
1470 | (char *) &debug_copy); | |
1471 | ||
bdbd5f50 | 1472 | /* Write a value of 1 to this member. */ |
f8b76e70 | 1473 | |
bdbd5f50 | 1474 | in_debugger = 1; |
b0246b3b | 1475 | write_memory (flag_addr, (char *) &in_debugger, sizeof (in_debugger)); |
a608f919 | 1476 | success = 1; |
f8b76e70 | 1477 | |
d261ece7 | 1478 | #else /* SVR4_SHARED_LIBS */ |
f8b76e70 | 1479 | |
a608f919 | 1480 | #ifdef BKPT_AT_SYMBOL |
f8b76e70 | 1481 | |
b0246b3b | 1482 | struct minimal_symbol *msymbol; |
a608f919 | 1483 | char **bkpt_namep; |
464c6c5f JL |
1484 | asection *interp_sect; |
1485 | ||
1486 | /* First, remove all the solib event breakpoints. Their addresses | |
1487 | may have changed since the last time we ran the program. */ | |
1488 | remove_solib_event_breakpoints (); | |
1489 | ||
1490 | #ifdef SVR4_SHARED_LIBS | |
7d0a3fc8 DT |
1491 | interp_text_sect_low = interp_text_sect_high = 0; |
1492 | interp_plt_sect_low = interp_plt_sect_high = 0; | |
1493 | ||
464c6c5f JL |
1494 | /* Find the .interp section; if not found, warn the user and drop |
1495 | into the old breakpoint at symbol code. */ | |
1496 | interp_sect = bfd_get_section_by_name (exec_bfd, ".interp"); | |
1497 | if (interp_sect) | |
1498 | { | |
1499 | unsigned int interp_sect_size; | |
1500 | char *buf; | |
1501 | CORE_ADDR load_addr; | |
1502 | bfd *tmp_bfd; | |
11be829f | 1503 | CORE_ADDR sym_addr = 0; |
464c6c5f JL |
1504 | |
1505 | /* Read the contents of the .interp section into a local buffer; | |
1506 | the contents specify the dynamic linker this program uses. */ | |
1507 | interp_sect_size = bfd_section_size (exec_bfd, interp_sect); | |
1508 | buf = alloca (interp_sect_size); | |
1509 | bfd_get_section_contents (exec_bfd, interp_sect, | |
1510 | buf, 0, interp_sect_size); | |
1511 | ||
1512 | /* Now we need to figure out where the dynamic linker was | |
1513 | loaded so that we can load its symbols and place a breakpoint | |
1514 | in the dynamic linker itself. | |
1515 | ||
1516 | This address is stored on the stack. However, I've been unable | |
1517 | to find any magic formula to find it for Solaris (appears to | |
1518 | be trivial on Linux). Therefore, we have to try an alternate | |
1519 | mechanism to find the dynamic linker's base address. */ | |
1520 | tmp_bfd = bfd_openr (buf, gnutarget); | |
1521 | if (tmp_bfd == NULL) | |
1522 | goto bkpt_at_symbol; | |
1523 | ||
1524 | /* Make sure the dynamic linker's really a useful object. */ | |
1525 | if (!bfd_check_format (tmp_bfd, bfd_object)) | |
1526 | { | |
1527 | warning ("Unable to grok dynamic linker %s as an object file", buf); | |
1528 | bfd_close (tmp_bfd); | |
1529 | goto bkpt_at_symbol; | |
1530 | } | |
1531 | ||
1532 | /* We find the dynamic linker's base address by examining the | |
1533 | current pc (which point at the entry point for the dynamic | |
1534 | linker) and subtracting the offset of the entry point. */ | |
1535 | load_addr = read_pc () - tmp_bfd->start_address; | |
1536 | ||
7d0a3fc8 DT |
1537 | /* Record the relocated start and end address of the dynamic linker |
1538 | text and plt section for in_svr4_dynsym_resolve_code. */ | |
1539 | interp_sect = bfd_get_section_by_name (tmp_bfd, ".text"); | |
1540 | if (interp_sect) | |
1541 | { | |
1542 | interp_text_sect_low = | |
1543 | bfd_section_vma (tmp_bfd, interp_sect) + load_addr; | |
1544 | interp_text_sect_high = | |
1545 | interp_text_sect_low + bfd_section_size (tmp_bfd, interp_sect); | |
1546 | } | |
1547 | interp_sect = bfd_get_section_by_name (tmp_bfd, ".plt"); | |
1548 | if (interp_sect) | |
1549 | { | |
1550 | interp_plt_sect_low = | |
1551 | bfd_section_vma (tmp_bfd, interp_sect) + load_addr; | |
1552 | interp_plt_sect_high = | |
1553 | interp_plt_sect_low + bfd_section_size (tmp_bfd, interp_sect); | |
1554 | } | |
1555 | ||
11be829f JL |
1556 | /* Now try to set a breakpoint in the dynamic linker. */ |
1557 | for (bkpt_namep = solib_break_names; *bkpt_namep != NULL; bkpt_namep++) | |
464c6c5f | 1558 | { |
11be829f JL |
1559 | sym_addr = bfd_lookup_symbol (tmp_bfd, *bkpt_namep); |
1560 | if (sym_addr != 0) | |
1561 | break; | |
464c6c5f JL |
1562 | } |
1563 | ||
464c6c5f JL |
1564 | /* We're done with the temporary bfd. */ |
1565 | bfd_close (tmp_bfd); | |
1566 | ||
11be829f | 1567 | if (sym_addr != 0) |
464c6c5f | 1568 | { |
11be829f JL |
1569 | create_solib_event_breakpoint (load_addr + sym_addr); |
1570 | return 1; | |
464c6c5f JL |
1571 | } |
1572 | ||
1573 | /* For whatever reason we couldn't set a breakpoint in the dynamic | |
1574 | linker. Warn and drop into the old code. */ | |
1575 | bkpt_at_symbol: | |
1576 | warning ("Unable to find dynamic linker breakpoint function."); | |
1577 | warning ("GDB will be unable to debug shared library initializers"); | |
1578 | warning ("and track explicitly loaded dynamic code."); | |
1579 | } | |
1580 | #endif | |
f8b76e70 | 1581 | |
a608f919 FF |
1582 | /* Scan through the list of symbols, trying to look up the symbol and |
1583 | set a breakpoint there. Terminate loop when we/if we succeed. */ | |
f8b76e70 | 1584 | |
a608f919 FF |
1585 | breakpoint_addr = 0; |
1586 | for (bkpt_namep = bkpt_names; *bkpt_namep != NULL; bkpt_namep++) | |
f8b76e70 | 1587 | { |
1a494973 | 1588 | msymbol = lookup_minimal_symbol (*bkpt_namep, NULL, symfile_objfile); |
a608f919 FF |
1589 | if ((msymbol != NULL) && (SYMBOL_VALUE_ADDRESS (msymbol) != 0)) |
1590 | { | |
464c6c5f JL |
1591 | create_solib_event_breakpoint (SYMBOL_VALUE_ADDRESS (msymbol)); |
1592 | return 1; | |
a608f919 | 1593 | } |
f8b76e70 FF |
1594 | } |
1595 | ||
464c6c5f | 1596 | /* Nothing good happened. */ |
7d0a3fc8 | 1597 | success = 0; |
f8b76e70 | 1598 | |
a608f919 | 1599 | #endif /* BKPT_AT_SYMBOL */ |
f8b76e70 | 1600 | |
d261ece7 | 1601 | #endif /* !SVR4_SHARED_LIBS */ |
f8b76e70 | 1602 | |
a608f919 | 1603 | return (success); |
f8b76e70 FF |
1604 | } |
1605 | ||
1606 | /* | |
1607 | ||
1608 | GLOBAL FUNCTION | |
1609 | ||
1610 | solib_create_inferior_hook -- shared library startup support | |
1611 | ||
1612 | SYNOPSIS | |
1613 | ||
1614 | void solib_create_inferior_hook() | |
1615 | ||
1616 | DESCRIPTION | |
1617 | ||
1618 | When gdb starts up the inferior, it nurses it along (through the | |
1619 | shell) until it is ready to execute it's first instruction. At this | |
1620 | point, this function gets called via expansion of the macro | |
1621 | SOLIB_CREATE_INFERIOR_HOOK. | |
1622 | ||
a608f919 FF |
1623 | For SunOS executables, this first instruction is typically the |
1624 | one at "_start", or a similar text label, regardless of whether | |
1625 | the executable is statically or dynamically linked. The runtime | |
1626 | startup code takes care of dynamically linking in any shared | |
1627 | libraries, once gdb allows the inferior to continue. | |
1628 | ||
1629 | For SVR4 executables, this first instruction is either the first | |
1630 | instruction in the dynamic linker (for dynamically linked | |
1631 | executables) or the instruction at "start" for statically linked | |
1632 | executables. For dynamically linked executables, the system | |
1633 | first exec's /lib/libc.so.N, which contains the dynamic linker, | |
1634 | and starts it running. The dynamic linker maps in any needed | |
1635 | shared libraries, maps in the actual user executable, and then | |
1636 | jumps to "start" in the user executable. | |
1637 | ||
f8b76e70 FF |
1638 | For both SunOS shared libraries, and SVR4 shared libraries, we |
1639 | can arrange to cooperate with the dynamic linker to discover the | |
1640 | names of shared libraries that are dynamically linked, and the | |
1641 | base addresses to which they are linked. | |
1642 | ||
1643 | This function is responsible for discovering those names and | |
1644 | addresses, and saving sufficient information about them to allow | |
1645 | their symbols to be read at a later time. | |
1646 | ||
1647 | FIXME | |
1648 | ||
1649 | Between enable_break() and disable_break(), this code does not | |
1650 | properly handle hitting breakpoints which the user might have | |
1651 | set in the startup code or in the dynamic linker itself. Proper | |
1652 | handling will probably have to wait until the implementation is | |
1653 | changed to use the "breakpoint handler function" method. | |
1654 | ||
1655 | Also, what if child has exit()ed? Must exit loop somehow. | |
1656 | */ | |
1657 | ||
1658 | void | |
1659 | solib_create_inferior_hook() | |
1660 | { | |
ff56144e JK |
1661 | /* If we are using the BKPT_AT_SYMBOL code, then we don't need the base |
1662 | yet. In fact, in the case of a SunOS4 executable being run on | |
1663 | Solaris, we can't get it yet. find_solib will get it when it needs | |
1664 | it. */ | |
1665 | #if !(defined (SVR4_SHARED_LIBS) && defined (BKPT_AT_SYMBOL)) | |
f8b76e70 FF |
1666 | if ((debug_base = locate_base ()) == 0) |
1667 | { | |
1668 | /* Can't find the symbol or the executable is statically linked. */ | |
1669 | return; | |
1670 | } | |
ff56144e | 1671 | #endif |
f8b76e70 FF |
1672 | |
1673 | if (!enable_break ()) | |
1674 | { | |
1675 | warning ("shared library handler failed to enable breakpoint"); | |
1676 | return; | |
1677 | } | |
1678 | ||
13f6c7ea | 1679 | #ifndef SVR4_SHARED_LIBS |
464c6c5f JL |
1680 | /* Only SunOS needs the loop below, other systems should be using the |
1681 | special shared library breakpoints and the shared library breakpoint | |
1682 | service routine. | |
1683 | ||
1684 | Now run the target. It will eventually hit the breakpoint, at | |
f8b76e70 FF |
1685 | which point all of the libraries will have been mapped in and we |
1686 | can go groveling around in the dynamic linker structures to find | |
1687 | out what we need to know about them. */ | |
bdbd5f50 JG |
1688 | |
1689 | clear_proceed_status (); | |
1690 | stop_soon_quietly = 1; | |
4ad0021e | 1691 | stop_signal = TARGET_SIGNAL_0; |
f8b76e70 | 1692 | do |
bdbd5f50 | 1693 | { |
8d60affd | 1694 | target_resume (-1, 0, stop_signal); |
bdbd5f50 JG |
1695 | wait_for_inferior (); |
1696 | } | |
4ad0021e | 1697 | while (stop_signal != TARGET_SIGNAL_TRAP); |
bdbd5f50 | 1698 | stop_soon_quietly = 0; |
f8b76e70 FF |
1699 | |
1700 | /* We are now either at the "mapping complete" breakpoint (or somewhere | |
1701 | else, a condition we aren't prepared to deal with anyway), so adjust | |
1702 | the PC as necessary after a breakpoint, disable the breakpoint, and | |
1703 | add any shared libraries that were mapped in. */ | |
bdbd5f50 | 1704 | |
f8b76e70 FF |
1705 | if (DECR_PC_AFTER_BREAK) |
1706 | { | |
1707 | stop_pc -= DECR_PC_AFTER_BREAK; | |
1708 | write_register (PC_REGNUM, stop_pc); | |
1709 | } | |
1710 | ||
1711 | if (!disable_break ()) | |
1712 | { | |
1713 | warning ("shared library handler failed to disable breakpoint"); | |
1714 | } | |
1715 | ||
464c6c5f | 1716 | if (auto_solib_add) |
1a494973 | 1717 | solib_add ((char *) 0, 0, (struct target_ops *) 0); |
464c6c5f | 1718 | #endif |
bdbd5f50 JG |
1719 | } |
1720 | ||
f8b76e70 FF |
1721 | /* |
1722 | ||
b0246b3b FF |
1723 | LOCAL FUNCTION |
1724 | ||
1725 | special_symbol_handling -- additional shared library symbol handling | |
1726 | ||
1727 | SYNOPSIS | |
1728 | ||
1729 | void special_symbol_handling (struct so_list *so) | |
1730 | ||
1731 | DESCRIPTION | |
1732 | ||
1733 | Once the symbols from a shared object have been loaded in the usual | |
1734 | way, we are called to do any system specific symbol handling that | |
1735 | is needed. | |
1736 | ||
1a494973 C |
1737 | For SunOS4, this consists of grunging around in the dynamic |
1738 | linkers structures to find symbol definitions for "common" symbols | |
1739 | and adding them to the minimal symbol table for the runtime common | |
b0246b3b FF |
1740 | objfile. |
1741 | ||
1742 | */ | |
1743 | ||
1744 | static void | |
1745 | special_symbol_handling (so) | |
1746 | struct so_list *so; | |
1747 | { | |
1748 | #ifndef SVR4_SHARED_LIBS | |
51b57ded FF |
1749 | int j; |
1750 | ||
1751 | if (debug_addr == 0) | |
1752 | { | |
1753 | /* Get link_dynamic structure */ | |
1754 | ||
1755 | j = target_read_memory (debug_base, (char *) &dynamic_copy, | |
1756 | sizeof (dynamic_copy)); | |
1757 | if (j) | |
1758 | { | |
1759 | /* unreadable */ | |
1760 | return; | |
1761 | } | |
1762 | ||
1763 | /* Calc address of debugger interface structure */ | |
1764 | /* FIXME, this needs work for cross-debugging of core files | |
1765 | (byteorder, size, alignment, etc). */ | |
1766 | ||
1767 | debug_addr = (CORE_ADDR) dynamic_copy.ldd; | |
1768 | } | |
b0246b3b FF |
1769 | |
1770 | /* Read the debugger structure from the inferior, just to make sure | |
1771 | we have a current copy. */ | |
1772 | ||
51b57ded FF |
1773 | j = target_read_memory (debug_addr, (char *) &debug_copy, |
1774 | sizeof (debug_copy)); | |
1775 | if (j) | |
1776 | return; /* unreadable */ | |
b0246b3b FF |
1777 | |
1778 | /* Get common symbol definitions for the loaded object. */ | |
1779 | ||
1780 | if (debug_copy.ldd_cp) | |
1781 | { | |
1a494973 | 1782 | solib_add_common_symbols (debug_copy.ldd_cp); |
b0246b3b FF |
1783 | } |
1784 | ||
1785 | #endif /* !SVR4_SHARED_LIBS */ | |
1786 | } | |
1787 | ||
1788 | ||
1789 | /* | |
1790 | ||
1791 | LOCAL FUNCTION | |
f8b76e70 FF |
1792 | |
1793 | sharedlibrary_command -- handle command to explicitly add library | |
1794 | ||
1795 | SYNOPSIS | |
1796 | ||
b0246b3b | 1797 | static void sharedlibrary_command (char *args, int from_tty) |
f8b76e70 FF |
1798 | |
1799 | DESCRIPTION | |
1800 | ||
1801 | */ | |
1802 | ||
b0246b3b | 1803 | static void |
bdbd5f50 | 1804 | sharedlibrary_command (args, from_tty) |
f8b76e70 FF |
1805 | char *args; |
1806 | int from_tty; | |
bdbd5f50 | 1807 | { |
f8b76e70 FF |
1808 | dont_repeat (); |
1809 | solib_add (args, from_tty, (struct target_ops *) 0); | |
bd5635a1 RP |
1810 | } |
1811 | ||
ace4b8d7 FF |
1812 | #endif /* HAVE_LINK_H */ |
1813 | ||
bd5635a1 RP |
1814 | void |
1815 | _initialize_solib() | |
1816 | { | |
ace4b8d7 FF |
1817 | #ifdef HAVE_LINK_H |
1818 | ||
f8b76e70 | 1819 | add_com ("sharedlibrary", class_files, sharedlibrary_command, |
bd5635a1 | 1820 | "Load shared object library symbols for files matching REGEXP."); |
f8b76e70 FF |
1821 | add_info ("sharedlibrary", info_sharedlibrary_command, |
1822 | "Status of loaded shared object libraries."); | |
1a494973 C |
1823 | |
1824 | add_show_from_set | |
1825 | (add_set_cmd ("auto-solib-add", class_support, var_zinteger, | |
464c6c5f JL |
1826 | (char *) &auto_solib_add, |
1827 | "Set autoloading of shared library symbols.\n\ | |
1a494973 | 1828 | If nonzero, symbols from all shared object libraries will be loaded\n\ |
464c6c5f JL |
1829 | automatically when the inferior begins execution or when the dynamic linker\n\ |
1830 | informs gdb that a new library has been loaded. Otherwise, symbols\n\ | |
1a494973 C |
1831 | must be loaded manually, using `sharedlibrary'.", |
1832 | &setlist), | |
1833 | &showlist); | |
ace4b8d7 | 1834 | |
76420d46 SG |
1835 | add_show_from_set |
1836 | (add_set_cmd ("solib-absolute-prefix", class_support, var_filename, | |
1837 | (char *) &solib_absolute_prefix, | |
7d0a3fc8 | 1838 | "Set prefix for loading absolute shared library symbol files.\n\ |
76420d46 SG |
1839 | For other (relative) files, you can add values using `set solib-search-path'.", |
1840 | &setlist), | |
1841 | &showlist); | |
1842 | add_show_from_set | |
1843 | (add_set_cmd ("solib-search-path", class_support, var_string, | |
1844 | (char *) &solib_search_path, | |
7d0a3fc8 | 1845 | "Set the search path for loading non-absolute shared library symbol files.\n\ |
76420d46 SG |
1846 | This takes precedence over the environment variables PATH and LD_LIBRARY_PATH.", |
1847 | &setlist), | |
1848 | &showlist); | |
1849 | ||
ace4b8d7 | 1850 | #endif /* HAVE_LINK_H */ |
bd5635a1 | 1851 | } |