Commit | Line | Data |
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f8b76e70 | 1 | /* Handle SunOS and SVR4 shared libraries for GDB, the GNU Debugger. |
464c6c5f | 2 | Copyright 1990, 1991, 1992, 1993, 1994, 1995, 1996 |
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 | ||
bd5635a1 | 24 | #include <sys/types.h> |
f8b76e70 | 25 | #include <signal.h> |
2b576293 | 26 | #include "gdb_string.h" |
d0237a54 JK |
27 | #include <sys/param.h> |
28 | #include <fcntl.h> | |
1a494973 | 29 | #include <unistd.h> |
be772100 JG |
30 | |
31 | #ifndef SVR4_SHARED_LIBS | |
32 | /* SunOS shared libs need the nlist structure. */ | |
33 | #include <a.out.h> | |
2fe3b329 | 34 | #else |
1a494973 | 35 | #include "elf/external.h" |
be772100 | 36 | #endif |
f8b76e70 | 37 | |
1a494973 C |
38 | #include <link.h> |
39 | ||
bd5635a1 | 40 | #include "symtab.h" |
b0246b3b FF |
41 | #include "bfd.h" |
42 | #include "symfile.h" | |
be772100 | 43 | #include "objfiles.h" |
bd5635a1 RP |
44 | #include "gdbcore.h" |
45 | #include "command.h" | |
b3fdaf3d | 46 | #include "target.h" |
2403f49b | 47 | #include "frame.h" |
464c6c5f | 48 | #include "gnu-regex.h" |
bdbd5f50 | 49 | #include "inferior.h" |
6047ab6a | 50 | #include "environ.h" |
a71c0593 | 51 | #include "language.h" |
1a494973 | 52 | #include "gdbcmd.h" |
bdbd5f50 | 53 | |
2858b1f2 | 54 | #define MAX_PATH_SIZE 512 /* FIXME: Should be dynamic */ |
f8b76e70 | 55 | |
464c6c5f JL |
56 | /* On SVR4 systems, a list of symbols in the dynamic linker where |
57 | GDB can try to place a breakpoint to monitor shared library | |
58 | events. | |
59 | ||
60 | If none of these symbols are found, or other errors occur, then | |
61 | SVR4 systems will fall back to using a symbol as the "startup | |
62 | mapping complete" breakpoint address. */ | |
63 | ||
64 | #ifdef SVR4_SHARED_LIBS | |
65 | static char *solib_break_names[] = { | |
66 | "r_debug_state", | |
a404ea25 | 67 | "_r_debug_state", |
464c6c5f JL |
68 | "_dl_debug_state", |
69 | NULL | |
70 | }; | |
71 | #endif | |
f8b76e70 | 72 | |
a608f919 FF |
73 | #define BKPT_AT_SYMBOL 1 |
74 | ||
a71c0593 | 75 | #if defined (BKPT_AT_SYMBOL) && defined (SVR4_SHARED_LIBS) |
a608f919 FF |
76 | static char *bkpt_names[] = { |
77 | #ifdef SOLIB_BKPT_NAME | |
78 | SOLIB_BKPT_NAME, /* Prefer configured name if it exists. */ | |
79 | #endif | |
80 | "_start", | |
81 | "main", | |
82 | NULL | |
83 | }; | |
a71c0593 | 84 | #endif |
f8b76e70 | 85 | |
4ad0021e JK |
86 | /* Symbols which are used to locate the base of the link map structures. */ |
87 | ||
2fe3b329 | 88 | #ifndef SVR4_SHARED_LIBS |
4ad0021e | 89 | static char *debug_base_symbols[] = { |
2fe3b329 | 90 | "_DYNAMIC", |
1a494973 | 91 | "_DYNAMIC__MGC", |
4ad0021e JK |
92 | NULL |
93 | }; | |
2fe3b329 | 94 | #endif |
4ad0021e | 95 | |
1a494973 C |
96 | static char *main_name_list[] = { |
97 | "main_$main", | |
98 | NULL | |
99 | }; | |
100 | ||
f8b76e70 FF |
101 | /* local data declarations */ |
102 | ||
d261ece7 | 103 | #ifndef SVR4_SHARED_LIBS |
f8b76e70 | 104 | |
f8b76e70 FF |
105 | #define LM_ADDR(so) ((so) -> lm.lm_addr) |
106 | #define LM_NEXT(so) ((so) -> lm.lm_next) | |
107 | #define LM_NAME(so) ((so) -> lm.lm_name) | |
4ad0021e JK |
108 | /* Test for first link map entry; first entry is a shared library. */ |
109 | #define IGNORE_FIRST_LINK_MAP_ENTRY(x) (0) | |
f8b76e70 FF |
110 | static struct link_dynamic dynamic_copy; |
111 | static struct link_dynamic_2 ld_2_copy; | |
112 | static struct ld_debug debug_copy; | |
113 | static CORE_ADDR debug_addr; | |
114 | static CORE_ADDR flag_addr; | |
115 | ||
d261ece7 | 116 | #else /* SVR4_SHARED_LIBS */ |
f8b76e70 | 117 | |
f8b76e70 FF |
118 | #define LM_ADDR(so) ((so) -> lm.l_addr) |
119 | #define LM_NEXT(so) ((so) -> lm.l_next) | |
120 | #define LM_NAME(so) ((so) -> lm.l_name) | |
4ad0021e JK |
121 | /* Test for first link map entry; first entry is the exec-file. */ |
122 | #define IGNORE_FIRST_LINK_MAP_ENTRY(x) ((x).l_prev == NULL) | |
f8b76e70 | 123 | static struct r_debug debug_copy; |
f8b76e70 | 124 | char shadow_contents[BREAKPOINT_MAX]; /* Stash old bkpt addr contents */ |
f8b76e70 | 125 | |
d261ece7 | 126 | #endif /* !SVR4_SHARED_LIBS */ |
bd5635a1 | 127 | |
bd5635a1 | 128 | struct so_list { |
f8b76e70 FF |
129 | struct so_list *next; /* next structure in linked list */ |
130 | struct link_map lm; /* copy of link map from inferior */ | |
131 | struct link_map *lmaddr; /* addr in inferior lm was read from */ | |
132 | CORE_ADDR lmend; /* upper addr bound of mapped object */ | |
133 | char so_name[MAX_PATH_SIZE]; /* shared object lib name (FIXME) */ | |
134 | char symbols_loaded; /* flag: symbols read in yet? */ | |
135 | char from_tty; /* flag: print msgs? */ | |
b0246b3b | 136 | struct objfile *objfile; /* objfile for loaded lib */ |
f8b76e70 FF |
137 | struct section_table *sections; |
138 | struct section_table *sections_end; | |
51b57ded | 139 | struct section_table *textsection; |
a71c0593 | 140 | bfd *abfd; |
bd5635a1 RP |
141 | }; |
142 | ||
f8b76e70 FF |
143 | static struct so_list *so_list_head; /* List of known shared objects */ |
144 | static CORE_ADDR debug_base; /* Base of dynamic linker structures */ | |
145 | static CORE_ADDR breakpoint_addr; /* Address where end bkpt is set */ | |
146 | ||
51b57ded FF |
147 | extern int |
148 | fdmatch PARAMS ((int, int)); /* In libiberty */ | |
149 | ||
b0246b3b FF |
150 | /* Local function prototypes */ |
151 | ||
152 | static void | |
153 | special_symbol_handling PARAMS ((struct so_list *)); | |
154 | ||
155 | static void | |
156 | sharedlibrary_command PARAMS ((char *, int)); | |
157 | ||
158 | static int | |
159 | enable_break PARAMS ((void)); | |
160 | ||
161 | static int | |
162 | disable_break PARAMS ((void)); | |
163 | ||
164 | static void | |
51b57ded | 165 | info_sharedlibrary_command PARAMS ((char *, int)); |
b0246b3b FF |
166 | |
167 | static int | |
168 | symbol_add_stub PARAMS ((char *)); | |
169 | ||
170 | static struct so_list * | |
171 | find_solib PARAMS ((struct so_list *)); | |
172 | ||
173 | static struct link_map * | |
174 | first_link_map_member PARAMS ((void)); | |
175 | ||
176 | static CORE_ADDR | |
177 | locate_base PARAMS ((void)); | |
178 | ||
be772100 JG |
179 | static void |
180 | solib_map_sections PARAMS ((struct so_list *)); | |
181 | ||
182 | #ifdef SVR4_SHARED_LIBS | |
183 | ||
b0246b3b | 184 | static CORE_ADDR |
2fe3b329 | 185 | elf_locate_base PARAMS ((void)); |
b0246b3b | 186 | |
be772100 | 187 | #else |
b0246b3b FF |
188 | |
189 | static void | |
1a494973 C |
190 | allocate_rt_common_objfile PARAMS ((void)); |
191 | ||
192 | static void | |
193 | solib_add_common_symbols PARAMS ((struct rtc_symb *)); | |
b0246b3b FF |
194 | |
195 | #endif | |
bd5635a1 | 196 | |
d0237a54 | 197 | /* |
f8b76e70 FF |
198 | |
199 | LOCAL FUNCTION | |
200 | ||
201 | solib_map_sections -- open bfd and build sections for shared lib | |
202 | ||
203 | SYNOPSIS | |
204 | ||
205 | static void solib_map_sections (struct so_list *so) | |
206 | ||
207 | DESCRIPTION | |
208 | ||
209 | Given a pointer to one of the shared objects in our list | |
210 | of mapped objects, use the recorded name to open a bfd | |
211 | descriptor for the object, build a section table, and then | |
212 | relocate all the section addresses by the base address at | |
213 | which the shared object was mapped. | |
214 | ||
215 | FIXMES | |
216 | ||
217 | In most (all?) cases the shared object file name recorded in the | |
218 | dynamic linkage tables will be a fully qualified pathname. For | |
219 | cases where it isn't, do we really mimic the systems search | |
220 | mechanism correctly in the below code (particularly the tilde | |
221 | expansion stuff?). | |
222 | */ | |
223 | ||
d0237a54 | 224 | static void |
f8b76e70 FF |
225 | solib_map_sections (so) |
226 | struct so_list *so; | |
d0237a54 JK |
227 | { |
228 | char *filename; | |
229 | char *scratch_pathname; | |
230 | int scratch_chan; | |
231 | struct section_table *p; | |
de9bef49 JG |
232 | struct cleanup *old_chain; |
233 | bfd *abfd; | |
d0237a54 | 234 | |
f8b76e70 | 235 | filename = tilde_expand (so -> so_name); |
de9bef49 | 236 | old_chain = make_cleanup (free, filename); |
d0237a54 | 237 | |
6047ab6a KH |
238 | scratch_chan = openp (get_in_environ (inferior_environ, "PATH"), |
239 | 1, filename, O_RDONLY, 0, &scratch_pathname); | |
d0237a54 | 240 | if (scratch_chan < 0) |
f8b76e70 | 241 | { |
6047ab6a KH |
242 | scratch_chan = openp (get_in_environ |
243 | (inferior_environ, "LD_LIBRARY_PATH"), | |
244 | 1, filename, O_RDONLY, 0, &scratch_pathname); | |
f8b76e70 | 245 | } |
d0237a54 | 246 | if (scratch_chan < 0) |
f8b76e70 FF |
247 | { |
248 | perror_with_name (filename); | |
a608f919 | 249 | } |
a71c0593 | 250 | /* Leave scratch_pathname allocated. abfd->name will point to it. */ |
f8b76e70 | 251 | |
a71c0593 | 252 | abfd = bfd_fdopenr (scratch_pathname, gnutarget, scratch_chan); |
de9bef49 | 253 | if (!abfd) |
f8b76e70 | 254 | { |
de9bef49 | 255 | close (scratch_chan); |
f8b76e70 | 256 | error ("Could not open `%s' as an executable file: %s", |
4ad0021e | 257 | scratch_pathname, bfd_errmsg (bfd_get_error ())); |
f8b76e70 | 258 | } |
a608f919 | 259 | /* Leave bfd open, core_xfer_memory and "info files" need it. */ |
a71c0593 | 260 | so -> abfd = abfd; |
a608f919 | 261 | abfd -> cacheable = true; |
de9bef49 | 262 | |
2858b1f2 KH |
263 | /* copy full path name into so_name, so that later symbol_file_add can find |
264 | it */ | |
265 | if (strlen (scratch_pathname) >= MAX_PATH_SIZE) | |
266 | error ("Full path name length of shared library exceeds MAX_PATH_SIZE in so_list structure."); | |
267 | strcpy (so->so_name, scratch_pathname); | |
268 | ||
de9bef49 | 269 | if (!bfd_check_format (abfd, bfd_object)) |
f8b76e70 FF |
270 | { |
271 | error ("\"%s\": not in executable format: %s.", | |
4ad0021e | 272 | scratch_pathname, bfd_errmsg (bfd_get_error ())); |
f8b76e70 | 273 | } |
de9bef49 | 274 | if (build_section_table (abfd, &so -> sections, &so -> sections_end)) |
f8b76e70 FF |
275 | { |
276 | error ("Can't find the file sections in `%s': %s", | |
2fe3b329 | 277 | bfd_get_filename (abfd), bfd_errmsg (bfd_get_error ())); |
f8b76e70 FF |
278 | } |
279 | ||
280 | for (p = so -> sections; p < so -> sections_end; p++) | |
281 | { | |
282 | /* Relocate the section binding addresses as recorded in the shared | |
283 | object's file by the base address to which the object was actually | |
284 | mapped. */ | |
285 | p -> addr += (CORE_ADDR) LM_ADDR (so); | |
286 | p -> endaddr += (CORE_ADDR) LM_ADDR (so); | |
287 | so -> lmend = (CORE_ADDR) max (p -> endaddr, so -> lmend); | |
2fe3b329 | 288 | if (STREQ (p -> the_bfd_section -> name, ".text")) |
51b57ded FF |
289 | { |
290 | so -> textsection = p; | |
291 | } | |
f8b76e70 | 292 | } |
de9bef49 JG |
293 | |
294 | /* Free the file names, close the file now. */ | |
295 | do_cleanups (old_chain); | |
f8b76e70 FF |
296 | } |
297 | ||
7f435241 FF |
298 | #ifndef SVR4_SHARED_LIBS |
299 | ||
1a494973 C |
300 | /* Allocate the runtime common object file. */ |
301 | ||
302 | static void | |
303 | allocate_rt_common_objfile () | |
304 | { | |
305 | struct objfile *objfile; | |
306 | struct objfile *last_one; | |
307 | ||
308 | objfile = (struct objfile *) xmalloc (sizeof (struct objfile)); | |
309 | memset (objfile, 0, sizeof (struct objfile)); | |
310 | objfile -> md = NULL; | |
464c6c5f JL |
311 | obstack_specify_allocation (&objfile -> psymbol_cache.cache, 0, 0, |
312 | xmalloc, free); | |
1a494973 C |
313 | obstack_specify_allocation (&objfile -> psymbol_obstack, 0, 0, xmalloc, |
314 | free); | |
315 | obstack_specify_allocation (&objfile -> symbol_obstack, 0, 0, xmalloc, | |
316 | free); | |
317 | obstack_specify_allocation (&objfile -> type_obstack, 0, 0, xmalloc, | |
318 | free); | |
319 | objfile -> name = mstrsave (objfile -> md, "rt_common"); | |
320 | ||
321 | /* Add this file onto the tail of the linked list of other such files. */ | |
322 | ||
323 | objfile -> next = NULL; | |
324 | if (object_files == NULL) | |
325 | object_files = objfile; | |
326 | else | |
327 | { | |
328 | for (last_one = object_files; | |
329 | last_one -> next; | |
330 | last_one = last_one -> next); | |
331 | last_one -> next = objfile; | |
332 | } | |
333 | ||
334 | rt_common_objfile = objfile; | |
335 | } | |
2a4e8cc3 | 336 | |
1a494973 C |
337 | /* Read all dynamically loaded common symbol definitions from the inferior |
338 | and put them into the minimal symbol table for the runtime common | |
339 | objfile. */ | |
2a4e8cc3 | 340 | |
d261ece7 | 341 | static void |
1a494973 | 342 | solib_add_common_symbols (rtc_symp) |
d261ece7 SG |
343 | struct rtc_symb *rtc_symp; |
344 | { | |
345 | struct rtc_symb inferior_rtc_symb; | |
346 | struct nlist inferior_rtc_nlist; | |
b0246b3b FF |
347 | int len; |
348 | char *name; | |
349 | char *origname; | |
d261ece7 | 350 | |
1a494973 C |
351 | /* Remove any runtime common symbols from previous runs. */ |
352 | ||
353 | if (rt_common_objfile != NULL && rt_common_objfile -> minimal_symbol_count) | |
354 | { | |
355 | obstack_free (&rt_common_objfile -> symbol_obstack, 0); | |
356 | obstack_specify_allocation (&rt_common_objfile -> symbol_obstack, 0, 0, | |
357 | xmalloc, free); | |
358 | rt_common_objfile -> minimal_symbol_count = 0; | |
359 | rt_common_objfile -> msymbols = NULL; | |
360 | } | |
361 | ||
b0246b3b FF |
362 | init_minimal_symbol_collection (); |
363 | make_cleanup (discard_minimal_symbols, 0); | |
d261ece7 SG |
364 | |
365 | while (rtc_symp) | |
366 | { | |
b0246b3b FF |
367 | read_memory ((CORE_ADDR) rtc_symp, |
368 | (char *) &inferior_rtc_symb, | |
369 | sizeof (inferior_rtc_symb)); | |
370 | read_memory ((CORE_ADDR) inferior_rtc_symb.rtc_sp, | |
371 | (char *) &inferior_rtc_nlist, | |
372 | sizeof(inferior_rtc_nlist)); | |
373 | if (inferior_rtc_nlist.n_type == N_COMM) | |
374 | { | |
375 | /* FIXME: The length of the symbol name is not available, but in the | |
376 | current implementation the common symbol is allocated immediately | |
377 | behind the name of the symbol. */ | |
378 | len = inferior_rtc_nlist.n_value - inferior_rtc_nlist.n_un.n_strx; | |
379 | ||
380 | origname = name = xmalloc (len); | |
381 | read_memory ((CORE_ADDR) inferior_rtc_nlist.n_un.n_name, name, len); | |
382 | ||
1a494973 C |
383 | /* Allocate the runtime common objfile if necessary. */ |
384 | if (rt_common_objfile == NULL) | |
385 | allocate_rt_common_objfile (); | |
d261ece7 | 386 | |
1a494973 C |
387 | name = obsavestring (name, strlen (name), |
388 | &rt_common_objfile -> symbol_obstack); | |
389 | prim_record_minimal_symbol (name, inferior_rtc_nlist.n_value, | |
390 | mst_bss, rt_common_objfile); | |
b0246b3b FF |
391 | free (origname); |
392 | } | |
393 | rtc_symp = inferior_rtc_symb.rtc_next; | |
d261ece7 SG |
394 | } |
395 | ||
b0246b3b | 396 | /* Install any minimal symbols that have been collected as the current |
1a494973 | 397 | minimal symbols for the runtime common objfile. */ |
b0246b3b | 398 | |
1a494973 | 399 | install_minimal_symbols (rt_common_objfile); |
d261ece7 SG |
400 | } |
401 | ||
7f435241 FF |
402 | #endif /* SVR4_SHARED_LIBS */ |
403 | ||
2fe3b329 | 404 | |
be772100 JG |
405 | #ifdef SVR4_SHARED_LIBS |
406 | ||
54d478cd PS |
407 | static CORE_ADDR |
408 | bfd_lookup_symbol PARAMS ((bfd *, char *)); | |
409 | ||
410 | /* | |
411 | ||
412 | LOCAL FUNCTION | |
413 | ||
414 | bfd_lookup_symbol -- lookup the value for a specific symbol | |
415 | ||
416 | SYNOPSIS | |
417 | ||
418 | CORE_ADDR bfd_lookup_symbol (bfd *abfd, char *symname) | |
419 | ||
420 | DESCRIPTION | |
421 | ||
422 | An expensive way to lookup the value of a single symbol for | |
423 | bfd's that are only temporary anyway. This is used by the | |
424 | shared library support to find the address of the debugger | |
425 | interface structures in the shared library. | |
426 | ||
427 | Note that 0 is specifically allowed as an error return (no | |
428 | such symbol). | |
429 | */ | |
430 | ||
431 | static CORE_ADDR | |
432 | bfd_lookup_symbol (abfd, symname) | |
433 | bfd *abfd; | |
434 | char *symname; | |
435 | { | |
436 | unsigned int storage_needed; | |
437 | asymbol *sym; | |
438 | asymbol **symbol_table; | |
439 | unsigned int number_of_symbols; | |
440 | unsigned int i; | |
441 | struct cleanup *back_to; | |
442 | CORE_ADDR symaddr = 0; | |
443 | ||
444 | storage_needed = bfd_get_symtab_upper_bound (abfd); | |
445 | ||
446 | if (storage_needed > 0) | |
447 | { | |
448 | symbol_table = (asymbol **) xmalloc (storage_needed); | |
449 | back_to = make_cleanup (free, (PTR)symbol_table); | |
450 | number_of_symbols = bfd_canonicalize_symtab (abfd, symbol_table); | |
451 | ||
452 | for (i = 0; i < number_of_symbols; i++) | |
453 | { | |
454 | sym = *symbol_table++; | |
455 | if (STREQ (sym -> name, symname)) | |
456 | { | |
457 | /* Bfd symbols are section relative. */ | |
458 | symaddr = sym -> value + sym -> section -> vma; | |
459 | break; | |
460 | } | |
461 | } | |
462 | do_cleanups (back_to); | |
463 | } | |
464 | return (symaddr); | |
465 | } | |
466 | ||
a404ea25 JL |
467 | #ifdef HANDLE_SVR4_EXEC_EMULATORS |
468 | ||
469 | /* | |
470 | Solaris BCP (the part of Solaris which allows it to run SunOS4 | |
471 | a.out files) throws in another wrinkle. Solaris does not fill | |
472 | in the usual a.out link map structures when running BCP programs, | |
473 | the only way to get at them is via groping around in the dynamic | |
474 | linker. | |
475 | The dynamic linker and it's structures are located in the shared | |
476 | C library, which gets run as the executable's "interpreter" by | |
477 | the kernel. | |
478 | ||
479 | Note that we can assume nothing about the process state at the time | |
480 | we need to find these structures. We may be stopped on the first | |
481 | instruction of the interpreter (C shared library), the first | |
482 | instruction of the executable itself, or somewhere else entirely | |
483 | (if we attached to the process for example). | |
484 | */ | |
485 | ||
486 | static char *debug_base_symbols[] = { | |
487 | "r_debug", /* Solaris 2.3 */ | |
488 | "_r_debug", /* Solaris 2.1, 2.2 */ | |
489 | NULL | |
490 | }; | |
491 | ||
492 | static int | |
493 | look_for_base PARAMS ((int, CORE_ADDR)); | |
494 | ||
54d478cd PS |
495 | /* |
496 | ||
497 | LOCAL FUNCTION | |
498 | ||
499 | look_for_base -- examine file for each mapped address segment | |
500 | ||
501 | SYNOPSYS | |
502 | ||
503 | static int look_for_base (int fd, CORE_ADDR baseaddr) | |
504 | ||
505 | DESCRIPTION | |
506 | ||
507 | This function is passed to proc_iterate_over_mappings, which | |
508 | causes it to get called once for each mapped address space, with | |
509 | an open file descriptor for the file mapped to that space, and the | |
510 | base address of that mapped space. | |
511 | ||
512 | Our job is to find the debug base symbol in the file that this | |
513 | fd is open on, if it exists, and if so, initialize the dynamic | |
514 | linker structure base address debug_base. | |
515 | ||
516 | Note that this is a computationally expensive proposition, since | |
517 | we basically have to open a bfd on every call, so we specifically | |
518 | avoid opening the exec file. | |
519 | */ | |
520 | ||
521 | static int | |
522 | look_for_base (fd, baseaddr) | |
523 | int fd; | |
524 | CORE_ADDR baseaddr; | |
525 | { | |
526 | bfd *interp_bfd; | |
527 | CORE_ADDR address = 0; | |
528 | char **symbolp; | |
529 | ||
530 | /* If the fd is -1, then there is no file that corresponds to this | |
531 | mapped memory segment, so skip it. Also, if the fd corresponds | |
532 | to the exec file, skip it as well. */ | |
533 | ||
534 | if (fd == -1 | |
535 | || (exec_bfd != NULL | |
536 | && fdmatch (fileno ((GDB_FILE *)(exec_bfd -> iostream)), fd))) | |
537 | { | |
538 | return (0); | |
539 | } | |
540 | ||
541 | /* Try to open whatever random file this fd corresponds to. Note that | |
542 | we have no way currently to find the filename. Don't gripe about | |
543 | any problems we might have, just fail. */ | |
544 | ||
545 | if ((interp_bfd = bfd_fdopenr ("unnamed", gnutarget, fd)) == NULL) | |
546 | { | |
547 | return (0); | |
548 | } | |
549 | if (!bfd_check_format (interp_bfd, bfd_object)) | |
550 | { | |
1a494973 C |
551 | /* FIXME-leak: on failure, might not free all memory associated with |
552 | interp_bfd. */ | |
54d478cd PS |
553 | bfd_close (interp_bfd); |
554 | return (0); | |
555 | } | |
556 | ||
557 | /* Now try to find our debug base symbol in this file, which we at | |
558 | least know to be a valid ELF executable or shared library. */ | |
559 | ||
560 | for (symbolp = debug_base_symbols; *symbolp != NULL; symbolp++) | |
561 | { | |
562 | address = bfd_lookup_symbol (interp_bfd, *symbolp); | |
563 | if (address != 0) | |
564 | { | |
565 | break; | |
566 | } | |
567 | } | |
568 | if (address == 0) | |
569 | { | |
1a494973 C |
570 | /* FIXME-leak: on failure, might not free all memory associated with |
571 | interp_bfd. */ | |
54d478cd PS |
572 | bfd_close (interp_bfd); |
573 | return (0); | |
574 | } | |
575 | ||
576 | /* Eureka! We found the symbol. But now we may need to relocate it | |
577 | by the base address. If the symbol's value is less than the base | |
578 | address of the shared library, then it hasn't yet been relocated | |
579 | by the dynamic linker, and we have to do it ourself. FIXME: Note | |
580 | that we make the assumption that the first segment that corresponds | |
581 | to the shared library has the base address to which the library | |
582 | was relocated. */ | |
583 | ||
584 | if (address < baseaddr) | |
585 | { | |
586 | address += baseaddr; | |
587 | } | |
588 | debug_base = address; | |
1a494973 C |
589 | /* FIXME-leak: on failure, might not free all memory associated with |
590 | interp_bfd. */ | |
54d478cd PS |
591 | bfd_close (interp_bfd); |
592 | return (1); | |
593 | } | |
594 | #endif /* HANDLE_SVR4_EXEC_EMULATORS */ | |
595 | ||
f8b76e70 FF |
596 | /* |
597 | ||
598 | LOCAL FUNCTION | |
599 | ||
2fe3b329 PS |
600 | elf_locate_base -- locate the base address of dynamic linker structs |
601 | for SVR4 elf targets. | |
f8b76e70 FF |
602 | |
603 | SYNOPSIS | |
604 | ||
2fe3b329 | 605 | CORE_ADDR elf_locate_base (void) |
f8b76e70 FF |
606 | |
607 | DESCRIPTION | |
608 | ||
2fe3b329 PS |
609 | For SVR4 elf targets the address of the dynamic linker's runtime |
610 | structure is contained within the dynamic info section in the | |
611 | executable file. The dynamic section is also mapped into the | |
612 | inferior address space. Because the runtime loader fills in the | |
613 | real address before starting the inferior, we have to read in the | |
614 | dynamic info section from the inferior address space. | |
615 | If there are any errors while trying to find the address, we | |
616 | silently return 0, otherwise the found address is returned. | |
f8b76e70 | 617 | |
2fe3b329 | 618 | */ |
f8b76e70 FF |
619 | |
620 | static CORE_ADDR | |
2fe3b329 | 621 | elf_locate_base () |
f8b76e70 | 622 | { |
1a494973 | 623 | sec_ptr dyninfo_sect; |
2fe3b329 PS |
624 | int dyninfo_sect_size; |
625 | CORE_ADDR dyninfo_addr; | |
626 | char *buf; | |
627 | char *bufend; | |
628 | ||
629 | /* Find the start address of the .dynamic section. */ | |
1a494973 | 630 | dyninfo_sect = bfd_get_section_by_name (exec_bfd, ".dynamic"); |
2fe3b329 PS |
631 | if (dyninfo_sect == NULL) |
632 | return 0; | |
1a494973 | 633 | dyninfo_addr = bfd_section_vma (exec_bfd, dyninfo_sect); |
2fe3b329 PS |
634 | |
635 | /* Read in .dynamic section, silently ignore errors. */ | |
1a494973 | 636 | dyninfo_sect_size = bfd_section_size (exec_bfd, dyninfo_sect); |
2fe3b329 PS |
637 | buf = alloca (dyninfo_sect_size); |
638 | if (target_read_memory (dyninfo_addr, buf, dyninfo_sect_size)) | |
639 | return 0; | |
640 | ||
641 | /* Find the DT_DEBUG entry in the the .dynamic section. | |
642 | For mips elf we look for DT_MIPS_RLD_MAP, mips elf apparently has | |
643 | no DT_DEBUG entries. */ | |
644 | /* FIXME: In lack of a 64 bit ELF ABI the following code assumes | |
645 | a 32 bit ELF ABI target. */ | |
646 | for (bufend = buf + dyninfo_sect_size; | |
647 | buf < bufend; | |
648 | buf += sizeof (Elf32_External_Dyn)) | |
f8b76e70 | 649 | { |
2fe3b329 PS |
650 | Elf32_External_Dyn *x_dynp = (Elf32_External_Dyn *)buf; |
651 | long dyn_tag; | |
652 | CORE_ADDR dyn_ptr; | |
653 | ||
654 | dyn_tag = bfd_h_get_32 (exec_bfd, (bfd_byte *) x_dynp->d_tag); | |
655 | if (dyn_tag == DT_NULL) | |
656 | break; | |
657 | else if (dyn_tag == DT_DEBUG) | |
d0237a54 | 658 | { |
2fe3b329 PS |
659 | dyn_ptr = bfd_h_get_32 (exec_bfd, (bfd_byte *) x_dynp->d_un.d_ptr); |
660 | return dyn_ptr; | |
d0237a54 | 661 | } |
1a494973 | 662 | #ifdef DT_MIPS_RLD_MAP |
2fe3b329 | 663 | else if (dyn_tag == DT_MIPS_RLD_MAP) |
4ad0021e | 664 | { |
2fe3b329 PS |
665 | char pbuf[TARGET_PTR_BIT / HOST_CHAR_BIT]; |
666 | ||
667 | /* DT_MIPS_RLD_MAP contains a pointer to the address | |
668 | of the dynamic link structure. */ | |
669 | dyn_ptr = bfd_h_get_32 (exec_bfd, (bfd_byte *) x_dynp->d_un.d_ptr); | |
670 | if (target_read_memory (dyn_ptr, pbuf, sizeof (pbuf))) | |
671 | return 0; | |
672 | return extract_unsigned_integer (pbuf, sizeof (pbuf)); | |
4ad0021e | 673 | } |
1a494973 | 674 | #endif |
4ad0021e | 675 | } |
d261ece7 | 676 | |
2fe3b329 PS |
677 | /* DT_DEBUG entry not found. */ |
678 | return 0; | |
d261ece7 SG |
679 | } |
680 | ||
2fe3b329 | 681 | #endif /* SVR4_SHARED_LIBS */ |
be772100 | 682 | |
d261ece7 SG |
683 | /* |
684 | ||
f8b76e70 FF |
685 | LOCAL FUNCTION |
686 | ||
687 | locate_base -- locate the base address of dynamic linker structs | |
688 | ||
689 | SYNOPSIS | |
690 | ||
691 | CORE_ADDR locate_base (void) | |
692 | ||
693 | DESCRIPTION | |
694 | ||
695 | For both the SunOS and SVR4 shared library implementations, if the | |
696 | inferior executable has been linked dynamically, there is a single | |
697 | address somewhere in the inferior's data space which is the key to | |
d261ece7 | 698 | locating all of the dynamic linker's runtime structures. This |
4ad0021e JK |
699 | address is the value of the debug base symbol. The job of this |
700 | function is to find and return that address, or to return 0 if there | |
701 | is no such address (the executable is statically linked for example). | |
f8b76e70 FF |
702 | |
703 | For SunOS, the job is almost trivial, since the dynamic linker and | |
704 | all of it's structures are statically linked to the executable at | |
705 | link time. Thus the symbol for the address we are looking for has | |
b0246b3b FF |
706 | already been added to the minimal symbol table for the executable's |
707 | objfile at the time the symbol file's symbols were read, and all we | |
708 | have to do is look it up there. Note that we explicitly do NOT want | |
709 | to find the copies in the shared library. | |
f8b76e70 | 710 | |
2fe3b329 PS |
711 | The SVR4 version is a bit more complicated because the address |
712 | is contained somewhere in the dynamic info section. We have to go | |
4ad0021e JK |
713 | to a lot more work to discover the address of the debug base symbol. |
714 | Because of this complexity, we cache the value we find and return that | |
715 | value on subsequent invocations. Note there is no copy in the | |
716 | executable symbol tables. | |
f8b76e70 | 717 | |
f8b76e70 FF |
718 | */ |
719 | ||
720 | static CORE_ADDR | |
721 | locate_base () | |
722 | { | |
f8b76e70 | 723 | |
d261ece7 | 724 | #ifndef SVR4_SHARED_LIBS |
f8b76e70 | 725 | |
b0246b3b | 726 | struct minimal_symbol *msymbol; |
d261ece7 | 727 | CORE_ADDR address = 0; |
4ad0021e | 728 | char **symbolp; |
f8b76e70 | 729 | |
4ad0021e JK |
730 | /* For SunOS, we want to limit the search for the debug base symbol to the |
731 | executable being debugged, since there is a duplicate named symbol in the | |
732 | shared library. We don't want the shared library versions. */ | |
b0246b3b | 733 | |
4ad0021e | 734 | for (symbolp = debug_base_symbols; *symbolp != NULL; symbolp++) |
f8b76e70 | 735 | { |
1a494973 | 736 | msymbol = lookup_minimal_symbol (*symbolp, NULL, symfile_objfile); |
4ad0021e JK |
737 | if ((msymbol != NULL) && (SYMBOL_VALUE_ADDRESS (msymbol) != 0)) |
738 | { | |
739 | address = SYMBOL_VALUE_ADDRESS (msymbol); | |
740 | return (address); | |
741 | } | |
f8b76e70 | 742 | } |
4ad0021e | 743 | return (0); |
f8b76e70 | 744 | |
d261ece7 | 745 | #else /* SVR4_SHARED_LIBS */ |
f8b76e70 | 746 | |
d261ece7 SG |
747 | /* Check to see if we have a currently valid address, and if so, avoid |
748 | doing all this work again and just return the cached address. If | |
2fe3b329 | 749 | we have no cached address, try to locate it in the dynamic info |
54d478cd | 750 | section for ELF executables. */ |
f8b76e70 | 751 | |
d261ece7 | 752 | if (debug_base == 0) |
f8b76e70 | 753 | { |
54d478cd PS |
754 | if (exec_bfd != NULL |
755 | && bfd_get_flavour (exec_bfd) == bfd_target_elf_flavour) | |
756 | debug_base = elf_locate_base (); | |
757 | #ifdef HANDLE_SVR4_EXEC_EMULATORS | |
758 | /* Try it the hard way for emulated executables. */ | |
759 | else if (inferior_pid != 0) | |
760 | proc_iterate_over_mappings (look_for_base); | |
761 | #endif | |
f8b76e70 | 762 | } |
d261ece7 | 763 | return (debug_base); |
f8b76e70 | 764 | |
d261ece7 | 765 | #endif /* !SVR4_SHARED_LIBS */ |
f8b76e70 FF |
766 | |
767 | } | |
bd5635a1 | 768 | |
a608f919 FF |
769 | /* |
770 | ||
771 | LOCAL FUNCTION | |
772 | ||
773 | first_link_map_member -- locate first member in dynamic linker's map | |
774 | ||
775 | SYNOPSIS | |
776 | ||
777 | static struct link_map *first_link_map_member (void) | |
778 | ||
779 | DESCRIPTION | |
780 | ||
781 | Read in a copy of the first member in the inferior's dynamic | |
782 | link map from the inferior's dynamic linker structures, and return | |
783 | a pointer to the copy in our address space. | |
784 | */ | |
785 | ||
f8b76e70 FF |
786 | static struct link_map * |
787 | first_link_map_member () | |
bd5635a1 | 788 | { |
f8b76e70 FF |
789 | struct link_map *lm = NULL; |
790 | ||
d261ece7 | 791 | #ifndef SVR4_SHARED_LIBS |
f8b76e70 | 792 | |
b0246b3b | 793 | read_memory (debug_base, (char *) &dynamic_copy, sizeof (dynamic_copy)); |
f8b76e70 FF |
794 | if (dynamic_copy.ld_version >= 2) |
795 | { | |
796 | /* It is a version that we can deal with, so read in the secondary | |
797 | structure and find the address of the link map list from it. */ | |
b0246b3b | 798 | read_memory ((CORE_ADDR) dynamic_copy.ld_un.ld_2, (char *) &ld_2_copy, |
f8b76e70 FF |
799 | sizeof (struct link_dynamic_2)); |
800 | lm = ld_2_copy.ld_loaded; | |
801 | } | |
802 | ||
d261ece7 | 803 | #else /* SVR4_SHARED_LIBS */ |
f8b76e70 | 804 | |
b0246b3b | 805 | read_memory (debug_base, (char *) &debug_copy, sizeof (struct r_debug)); |
a608f919 FF |
806 | /* FIXME: Perhaps we should validate the info somehow, perhaps by |
807 | checking r_version for a known version number, or r_state for | |
808 | RT_CONSISTENT. */ | |
f8b76e70 FF |
809 | lm = debug_copy.r_map; |
810 | ||
d261ece7 | 811 | #endif /* !SVR4_SHARED_LIBS */ |
d0237a54 | 812 | |
f8b76e70 FF |
813 | return (lm); |
814 | } | |
815 | ||
816 | /* | |
817 | ||
b0246b3b | 818 | LOCAL FUNCTION |
f8b76e70 FF |
819 | |
820 | find_solib -- step through list of shared objects | |
821 | ||
822 | SYNOPSIS | |
823 | ||
824 | struct so_list *find_solib (struct so_list *so_list_ptr) | |
825 | ||
826 | DESCRIPTION | |
827 | ||
828 | This module contains the routine which finds the names of any | |
829 | loaded "images" in the current process. The argument in must be | |
830 | NULL on the first call, and then the returned value must be passed | |
831 | in on subsequent calls. This provides the capability to "step" down | |
832 | the list of loaded objects. On the last object, a NULL value is | |
833 | returned. | |
d0237a54 | 834 | |
f8b76e70 FF |
835 | The arg and return value are "struct link_map" pointers, as defined |
836 | in <link.h>. | |
837 | */ | |
d0237a54 | 838 | |
b0246b3b | 839 | static struct so_list * |
f8b76e70 FF |
840 | find_solib (so_list_ptr) |
841 | struct so_list *so_list_ptr; /* Last lm or NULL for first one */ | |
842 | { | |
843 | struct so_list *so_list_next = NULL; | |
844 | struct link_map *lm = NULL; | |
845 | struct so_list *new; | |
846 | ||
847 | if (so_list_ptr == NULL) | |
848 | { | |
849 | /* We are setting up for a new scan through the loaded images. */ | |
850 | if ((so_list_next = so_list_head) == NULL) | |
851 | { | |
852 | /* We have not already read in the dynamic linking structures | |
853 | from the inferior, lookup the address of the base structure. */ | |
854 | debug_base = locate_base (); | |
a608f919 | 855 | if (debug_base != 0) |
f8b76e70 FF |
856 | { |
857 | /* Read the base structure in and find the address of the first | |
858 | link map list member. */ | |
859 | lm = first_link_map_member (); | |
860 | } | |
861 | } | |
862 | } | |
863 | else | |
864 | { | |
865 | /* We have been called before, and are in the process of walking | |
866 | the shared library list. Advance to the next shared object. */ | |
867 | if ((lm = LM_NEXT (so_list_ptr)) == NULL) | |
868 | { | |
869 | /* We have hit the end of the list, so check to see if any were | |
870 | added, but be quiet if we can't read from the target any more. */ | |
871 | int status = target_read_memory ((CORE_ADDR) so_list_ptr -> lmaddr, | |
872 | (char *) &(so_list_ptr -> lm), | |
873 | sizeof (struct link_map)); | |
874 | if (status == 0) | |
875 | { | |
876 | lm = LM_NEXT (so_list_ptr); | |
877 | } | |
878 | else | |
879 | { | |
880 | lm = NULL; | |
881 | } | |
882 | } | |
883 | so_list_next = so_list_ptr -> next; | |
884 | } | |
885 | if ((so_list_next == NULL) && (lm != NULL)) | |
886 | { | |
887 | /* Get next link map structure from inferior image and build a local | |
888 | abbreviated load_map structure */ | |
889 | new = (struct so_list *) xmalloc (sizeof (struct so_list)); | |
de9bef49 | 890 | memset ((char *) new, 0, sizeof (struct so_list)); |
f8b76e70 FF |
891 | new -> lmaddr = lm; |
892 | /* Add the new node as the next node in the list, or as the root | |
893 | node if this is the first one. */ | |
894 | if (so_list_ptr != NULL) | |
895 | { | |
896 | so_list_ptr -> next = new; | |
897 | } | |
898 | else | |
899 | { | |
900 | so_list_head = new; | |
901 | } | |
902 | so_list_next = new; | |
b0246b3b FF |
903 | read_memory ((CORE_ADDR) lm, (char *) &(new -> lm), |
904 | sizeof (struct link_map)); | |
4ad0021e JK |
905 | /* For SVR4 versions, the first entry in the link map is for the |
906 | inferior executable, so we must ignore it. For some versions of | |
907 | SVR4, it has no name. For others (Solaris 2.3 for example), it | |
908 | does have a name, so we can no longer use a missing name to | |
909 | decide when to ignore it. */ | |
910 | if (!IGNORE_FIRST_LINK_MAP_ENTRY (new -> lm)) | |
f8b76e70 | 911 | { |
4ad0021e JK |
912 | int errcode; |
913 | char *buffer; | |
914 | target_read_string ((CORE_ADDR) LM_NAME (new), &buffer, | |
915 | MAX_PATH_SIZE - 1, &errcode); | |
916 | if (errcode != 0) | |
917 | error ("find_solib: Can't read pathname for load map: %s\n", | |
918 | safe_strerror (errcode)); | |
919 | strncpy (new -> so_name, buffer, MAX_PATH_SIZE - 1); | |
920 | new -> so_name[MAX_PATH_SIZE - 1] = '\0'; | |
921 | free (buffer); | |
f8b76e70 FF |
922 | solib_map_sections (new); |
923 | } | |
924 | } | |
925 | return (so_list_next); | |
bd5635a1 | 926 | } |
d0237a54 | 927 | |
bdbd5f50 JG |
928 | /* A small stub to get us past the arg-passing pinhole of catch_errors. */ |
929 | ||
930 | static int | |
931 | symbol_add_stub (arg) | |
932 | char *arg; | |
d0237a54 | 933 | { |
f8b76e70 FF |
934 | register struct so_list *so = (struct so_list *) arg; /* catch_errs bogon */ |
935 | ||
54d478cd PS |
936 | so -> objfile = |
937 | symbol_file_add (so -> so_name, so -> from_tty, | |
938 | (so->textsection == NULL | |
939 | ? 0 | |
940 | : (unsigned int) so -> textsection -> addr), | |
941 | 0, 0, 0); | |
f8b76e70 | 942 | return (1); |
d0237a54 | 943 | } |
bd5635a1 | 944 | |
1a494973 C |
945 | /* This function will check the so name to see if matches the main list. |
946 | In some system the main object is in the list, which we want to exclude */ | |
947 | ||
948 | static int match_main (soname) | |
949 | char *soname; | |
950 | { | |
2858b1f2 | 951 | char **mainp; |
1a494973 | 952 | |
2858b1f2 KH |
953 | for (mainp = main_name_list; *mainp != NULL; mainp++) |
954 | { | |
955 | if (strcmp (soname, *mainp) == 0) | |
1a494973 | 956 | return (1); |
2858b1f2 | 957 | } |
1a494973 | 958 | |
2858b1f2 | 959 | return (0); |
1a494973 C |
960 | } |
961 | ||
f8b76e70 FF |
962 | /* |
963 | ||
964 | GLOBAL FUNCTION | |
965 | ||
966 | solib_add -- add a shared library file to the symtab and section list | |
967 | ||
968 | SYNOPSIS | |
969 | ||
970 | void solib_add (char *arg_string, int from_tty, | |
971 | struct target_ops *target) | |
972 | ||
973 | DESCRIPTION | |
974 | ||
975 | */ | |
bdbd5f50 JG |
976 | |
977 | void | |
978 | solib_add (arg_string, from_tty, target) | |
979 | char *arg_string; | |
980 | int from_tty; | |
981 | struct target_ops *target; | |
bd5635a1 | 982 | { |
f8b76e70 | 983 | register struct so_list *so = NULL; /* link map state variable */ |
a71c0593 FF |
984 | |
985 | /* Last shared library that we read. */ | |
986 | struct so_list *so_last = NULL; | |
987 | ||
f8b76e70 FF |
988 | char *re_err; |
989 | int count; | |
990 | int old; | |
991 | ||
992 | if ((re_err = re_comp (arg_string ? arg_string : ".")) != NULL) | |
993 | { | |
994 | error ("Invalid regexp: %s", re_err); | |
995 | } | |
996 | ||
2fe3b329 | 997 | /* Add the shared library sections to the section table of the |
54d478cd | 998 | specified target, if any. */ |
f8b76e70 FF |
999 | if (target) |
1000 | { | |
1001 | /* Count how many new section_table entries there are. */ | |
1002 | so = NULL; | |
1003 | count = 0; | |
1004 | while ((so = find_solib (so)) != NULL) | |
1005 | { | |
1a494973 | 1006 | if (so -> so_name[0] && !match_main (so -> so_name)) |
f8b76e70 FF |
1007 | { |
1008 | count += so -> sections_end - so -> sections; | |
1009 | } | |
1010 | } | |
1011 | ||
1012 | if (count) | |
1013 | { | |
464c6c5f JL |
1014 | int update_coreops; |
1015 | ||
1016 | /* We must update the to_sections field in the core_ops structure | |
1017 | here, otherwise we dereference a potential dangling pointer | |
1018 | for each call to target_read/write_memory within this routine. */ | |
1019 | update_coreops = core_ops.to_sections == target->to_sections; | |
1020 | ||
f8b76e70 | 1021 | /* Reallocate the target's section table including the new size. */ |
ee0613d1 | 1022 | if (target -> to_sections) |
f8b76e70 | 1023 | { |
ee0613d1 JG |
1024 | old = target -> to_sections_end - target -> to_sections; |
1025 | target -> to_sections = (struct section_table *) | |
a71c0593 | 1026 | xrealloc ((char *)target -> to_sections, |
f8b76e70 FF |
1027 | (sizeof (struct section_table)) * (count + old)); |
1028 | } | |
1029 | else | |
1030 | { | |
1031 | old = 0; | |
ee0613d1 | 1032 | target -> to_sections = (struct section_table *) |
a71c0593 | 1033 | xmalloc ((sizeof (struct section_table)) * count); |
f8b76e70 | 1034 | } |
ee0613d1 | 1035 | target -> to_sections_end = target -> to_sections + (count + old); |
f8b76e70 | 1036 | |
464c6c5f JL |
1037 | /* Update the to_sections field in the core_ops structure |
1038 | if needed. */ | |
1039 | if (update_coreops) | |
1040 | { | |
1041 | core_ops.to_sections = target->to_sections; | |
1042 | core_ops.to_sections_end = target->to_sections_end; | |
1043 | } | |
1044 | ||
f8b76e70 FF |
1045 | /* Add these section table entries to the target's table. */ |
1046 | while ((so = find_solib (so)) != NULL) | |
1047 | { | |
1048 | if (so -> so_name[0]) | |
1049 | { | |
1050 | count = so -> sections_end - so -> sections; | |
de9bef49 JG |
1051 | memcpy ((char *) (target -> to_sections + old), |
1052 | so -> sections, | |
1053 | (sizeof (struct section_table)) * count); | |
f8b76e70 FF |
1054 | old += count; |
1055 | } | |
1056 | } | |
1057 | } | |
1058 | } | |
2fe3b329 PS |
1059 | |
1060 | /* Now add the symbol files. */ | |
1061 | while ((so = find_solib (so)) != NULL) | |
1062 | { | |
1a494973 C |
1063 | if (so -> so_name[0] && re_exec (so -> so_name) && |
1064 | !match_main (so -> so_name)) | |
2fe3b329 PS |
1065 | { |
1066 | so -> from_tty = from_tty; | |
1067 | if (so -> symbols_loaded) | |
1068 | { | |
1069 | if (from_tty) | |
1070 | { | |
1071 | printf_unfiltered ("Symbols already loaded for %s\n", so -> so_name); | |
1072 | } | |
1073 | } | |
1074 | else if (catch_errors | |
1075 | (symbol_add_stub, (char *) so, | |
1076 | "Error while reading shared library symbols:\n", | |
1077 | RETURN_MASK_ALL)) | |
1078 | { | |
1079 | so_last = so; | |
1080 | so -> symbols_loaded = 1; | |
1081 | } | |
1082 | } | |
1083 | } | |
a71c0593 | 1084 | |
54d478cd PS |
1085 | /* Getting new symbols may change our opinion about what is |
1086 | frameless. */ | |
1087 | if (so_last) | |
1088 | reinit_frame_cache (); | |
1089 | ||
a71c0593 FF |
1090 | if (so_last) |
1091 | special_symbol_handling (so_last); | |
bd5635a1 | 1092 | } |
bdbd5f50 | 1093 | |
f8b76e70 | 1094 | /* |
bd5635a1 | 1095 | |
f8b76e70 FF |
1096 | LOCAL FUNCTION |
1097 | ||
1098 | info_sharedlibrary_command -- code for "info sharedlibrary" | |
1099 | ||
1100 | SYNOPSIS | |
1101 | ||
1102 | static void info_sharedlibrary_command () | |
1103 | ||
1104 | DESCRIPTION | |
bd5635a1 | 1105 | |
f8b76e70 FF |
1106 | Walk through the shared library list and print information |
1107 | about each attached library. | |
1108 | */ | |
1109 | ||
1110 | static void | |
51b57ded FF |
1111 | info_sharedlibrary_command (ignore, from_tty) |
1112 | char *ignore; | |
1113 | int from_tty; | |
f8b76e70 FF |
1114 | { |
1115 | register struct so_list *so = NULL; /* link map state variable */ | |
1116 | int header_done = 0; | |
1117 | ||
1118 | if (exec_bfd == NULL) | |
1119 | { | |
8d60affd | 1120 | printf_unfiltered ("No exec file.\n"); |
f8b76e70 FF |
1121 | return; |
1122 | } | |
1123 | while ((so = find_solib (so)) != NULL) | |
1124 | { | |
1125 | if (so -> so_name[0]) | |
1126 | { | |
1127 | if (!header_done) | |
1128 | { | |
8d60affd | 1129 | printf_unfiltered("%-12s%-12s%-12s%s\n", "From", "To", "Syms Read", |
f8b76e70 FF |
1130 | "Shared Object Library"); |
1131 | header_done++; | |
1132 | } | |
4ad0021e JK |
1133 | /* FIXME-32x64: need print_address_numeric with field width or |
1134 | some such. */ | |
8d60affd | 1135 | printf_unfiltered ("%-12s", |
a71c0593 FF |
1136 | local_hex_string_custom ((unsigned long) LM_ADDR (so), |
1137 | "08l")); | |
8d60affd | 1138 | printf_unfiltered ("%-12s", |
a71c0593 FF |
1139 | local_hex_string_custom ((unsigned long) so -> lmend, |
1140 | "08l")); | |
8d60affd JK |
1141 | printf_unfiltered ("%-12s", so -> symbols_loaded ? "Yes" : "No"); |
1142 | printf_unfiltered ("%s\n", so -> so_name); | |
bd5635a1 | 1143 | } |
bd5635a1 | 1144 | } |
f8b76e70 FF |
1145 | if (so_list_head == NULL) |
1146 | { | |
8d60affd | 1147 | printf_unfiltered ("No shared libraries loaded at this time.\n"); |
bd5635a1 RP |
1148 | } |
1149 | } | |
1150 | ||
1151 | /* | |
f8b76e70 FF |
1152 | |
1153 | GLOBAL FUNCTION | |
1154 | ||
1155 | solib_address -- check to see if an address is in a shared lib | |
1156 | ||
1157 | SYNOPSIS | |
1158 | ||
464c6c5f | 1159 | char * solib_address (CORE_ADDR address) |
f8b76e70 FF |
1160 | |
1161 | DESCRIPTION | |
1162 | ||
1163 | Provides a hook for other gdb routines to discover whether or | |
1164 | not a particular address is within the mapped address space of | |
1165 | a shared library. Any address between the base mapping address | |
1166 | and the first address beyond the end of the last mapping, is | |
1167 | considered to be within the shared library address space, for | |
1168 | our purposes. | |
1169 | ||
1170 | For example, this routine is called at one point to disable | |
1171 | breakpoints which are in shared libraries that are not currently | |
1172 | mapped in. | |
1173 | */ | |
1174 | ||
464c6c5f | 1175 | char * |
f8b76e70 | 1176 | solib_address (address) |
bd5635a1 RP |
1177 | CORE_ADDR address; |
1178 | { | |
f8b76e70 FF |
1179 | register struct so_list *so = 0; /* link map state variable */ |
1180 | ||
1181 | while ((so = find_solib (so)) != NULL) | |
1182 | { | |
1183 | if (so -> so_name[0]) | |
1184 | { | |
1185 | if ((address >= (CORE_ADDR) LM_ADDR (so)) && | |
1186 | (address < (CORE_ADDR) so -> lmend)) | |
464c6c5f | 1187 | return (so->so_name); |
f8b76e70 FF |
1188 | } |
1189 | } | |
1190 | return (0); | |
1191 | } | |
1192 | ||
1193 | /* Called by free_all_symtabs */ | |
bd5635a1 | 1194 | |
f8b76e70 FF |
1195 | void |
1196 | clear_solib() | |
1197 | { | |
1198 | struct so_list *next; | |
a608f919 | 1199 | char *bfd_filename; |
f8b76e70 FF |
1200 | |
1201 | while (so_list_head) | |
1202 | { | |
1203 | if (so_list_head -> sections) | |
1204 | { | |
be772100 | 1205 | free ((PTR)so_list_head -> sections); |
f8b76e70 | 1206 | } |
a71c0593 | 1207 | if (so_list_head -> abfd) |
a608f919 | 1208 | { |
a71c0593 | 1209 | bfd_filename = bfd_get_filename (so_list_head -> abfd); |
1a494973 C |
1210 | if (!bfd_close (so_list_head -> abfd)) |
1211 | warning ("cannot close \"%s\": %s", | |
1212 | bfd_filename, bfd_errmsg (bfd_get_error ())); | |
a608f919 FF |
1213 | } |
1214 | else | |
1215 | /* This happens for the executable on SVR4. */ | |
1216 | bfd_filename = NULL; | |
1217 | ||
f8b76e70 | 1218 | next = so_list_head -> next; |
a608f919 FF |
1219 | if (bfd_filename) |
1220 | free ((PTR)bfd_filename); | |
1221 | free ((PTR)so_list_head); | |
f8b76e70 | 1222 | so_list_head = next; |
bd5635a1 | 1223 | } |
f8b76e70 | 1224 | debug_base = 0; |
bd5635a1 RP |
1225 | } |
1226 | ||
1227 | /* | |
f8b76e70 FF |
1228 | |
1229 | LOCAL FUNCTION | |
1230 | ||
1231 | disable_break -- remove the "mapping changed" breakpoint | |
1232 | ||
1233 | SYNOPSIS | |
1234 | ||
1235 | static int disable_break () | |
1236 | ||
1237 | DESCRIPTION | |
1238 | ||
1239 | Removes the breakpoint that gets hit when the dynamic linker | |
1240 | completes a mapping change. | |
1241 | ||
bd5635a1 | 1242 | */ |
f8b76e70 FF |
1243 | |
1244 | static int | |
1245 | disable_break () | |
bd5635a1 | 1246 | { |
f8b76e70 FF |
1247 | int status = 1; |
1248 | ||
d261ece7 | 1249 | #ifndef SVR4_SHARED_LIBS |
f8b76e70 FF |
1250 | |
1251 | int in_debugger = 0; | |
1252 | ||
f8b76e70 FF |
1253 | /* Read the debugger structure from the inferior to retrieve the |
1254 | address of the breakpoint and the original contents of the | |
1255 | breakpoint address. Remove the breakpoint by writing the original | |
1256 | contents back. */ | |
1257 | ||
b0246b3b | 1258 | read_memory (debug_addr, (char *) &debug_copy, sizeof (debug_copy)); |
d261ece7 SG |
1259 | |
1260 | /* Set `in_debugger' to zero now. */ | |
1261 | ||
b0246b3b | 1262 | write_memory (flag_addr, (char *) &in_debugger, sizeof (in_debugger)); |
d261ece7 | 1263 | |
f8b76e70 | 1264 | breakpoint_addr = (CORE_ADDR) debug_copy.ldd_bp_addr; |
b0246b3b | 1265 | write_memory (breakpoint_addr, (char *) &debug_copy.ldd_bp_inst, |
f8b76e70 FF |
1266 | sizeof (debug_copy.ldd_bp_inst)); |
1267 | ||
d261ece7 | 1268 | #else /* SVR4_SHARED_LIBS */ |
f8b76e70 FF |
1269 | |
1270 | /* Note that breakpoint address and original contents are in our address | |
1271 | space, so we just need to write the original contents back. */ | |
1272 | ||
1273 | if (memory_remove_breakpoint (breakpoint_addr, shadow_contents) != 0) | |
1274 | { | |
1275 | status = 0; | |
1276 | } | |
1277 | ||
d261ece7 | 1278 | #endif /* !SVR4_SHARED_LIBS */ |
f8b76e70 FF |
1279 | |
1280 | /* For the SVR4 version, we always know the breakpoint address. For the | |
1281 | SunOS version we don't know it until the above code is executed. | |
1282 | Grumble if we are stopped anywhere besides the breakpoint address. */ | |
1283 | ||
1284 | if (stop_pc != breakpoint_addr) | |
1285 | { | |
1286 | warning ("stopped at unknown breakpoint while handling shared libraries"); | |
1287 | } | |
1288 | ||
1289 | return (status); | |
bdbd5f50 JG |
1290 | } |
1291 | ||
f8b76e70 | 1292 | /* |
bdbd5f50 | 1293 | |
f8b76e70 FF |
1294 | LOCAL FUNCTION |
1295 | ||
1296 | enable_break -- arrange for dynamic linker to hit breakpoint | |
1297 | ||
1298 | SYNOPSIS | |
1299 | ||
1300 | int enable_break (void) | |
1301 | ||
1302 | DESCRIPTION | |
1303 | ||
1304 | Both the SunOS and the SVR4 dynamic linkers have, as part of their | |
1305 | debugger interface, support for arranging for the inferior to hit | |
1306 | a breakpoint after mapping in the shared libraries. This function | |
1307 | enables that breakpoint. | |
1308 | ||
1309 | For SunOS, there is a special flag location (in_debugger) which we | |
1310 | set to 1. When the dynamic linker sees this flag set, it will set | |
1311 | a breakpoint at a location known only to itself, after saving the | |
1312 | original contents of that place and the breakpoint address itself, | |
1313 | in it's own internal structures. When we resume the inferior, it | |
1314 | will eventually take a SIGTRAP when it runs into the breakpoint. | |
1315 | We handle this (in a different place) by restoring the contents of | |
1316 | the breakpointed location (which is only known after it stops), | |
1317 | chasing around to locate the shared libraries that have been | |
1318 | loaded, then resuming. | |
1319 | ||
1320 | For SVR4, the debugger interface structure contains a member (r_brk) | |
1321 | which is statically initialized at the time the shared library is | |
1322 | built, to the offset of a function (_r_debug_state) which is guaran- | |
1323 | teed to be called once before mapping in a library, and again when | |
1324 | the mapping is complete. At the time we are examining this member, | |
1325 | it contains only the unrelocated offset of the function, so we have | |
1326 | to do our own relocation. Later, when the dynamic linker actually | |
1327 | runs, it relocates r_brk to be the actual address of _r_debug_state(). | |
1328 | ||
1329 | The debugger interface structure also contains an enumeration which | |
1330 | is set to either RT_ADD or RT_DELETE prior to changing the mapping, | |
1331 | depending upon whether or not the library is being mapped or unmapped, | |
1332 | and then set to RT_CONSISTENT after the library is mapped/unmapped. | |
1333 | */ | |
1334 | ||
1335 | static int | |
1336 | enable_break () | |
bdbd5f50 | 1337 | { |
a608f919 | 1338 | int success = 0; |
bdbd5f50 | 1339 | |
d261ece7 | 1340 | #ifndef SVR4_SHARED_LIBS |
bdbd5f50 | 1341 | |
51b57ded | 1342 | int j; |
f8b76e70 | 1343 | int in_debugger; |
51b57ded | 1344 | |
bdbd5f50 | 1345 | /* Get link_dynamic structure */ |
f8b76e70 FF |
1346 | |
1347 | j = target_read_memory (debug_base, (char *) &dynamic_copy, | |
1348 | sizeof (dynamic_copy)); | |
1349 | if (j) | |
1350 | { | |
1351 | /* unreadable */ | |
1352 | return (0); | |
1353 | } | |
06b6c733 | 1354 | |
bdbd5f50 | 1355 | /* Calc address of debugger interface structure */ |
f8b76e70 FF |
1356 | |
1357 | debug_addr = (CORE_ADDR) dynamic_copy.ldd; | |
1358 | ||
bdbd5f50 | 1359 | /* Calc address of `in_debugger' member of debugger interface structure */ |
f8b76e70 FF |
1360 | |
1361 | flag_addr = debug_addr + (CORE_ADDR) ((char *) &debug_copy.ldd_in_debugger - | |
1362 | (char *) &debug_copy); | |
1363 | ||
bdbd5f50 | 1364 | /* Write a value of 1 to this member. */ |
f8b76e70 | 1365 | |
bdbd5f50 | 1366 | in_debugger = 1; |
b0246b3b | 1367 | write_memory (flag_addr, (char *) &in_debugger, sizeof (in_debugger)); |
a608f919 | 1368 | success = 1; |
f8b76e70 | 1369 | |
d261ece7 | 1370 | #else /* SVR4_SHARED_LIBS */ |
f8b76e70 | 1371 | |
a608f919 | 1372 | #ifdef BKPT_AT_SYMBOL |
f8b76e70 | 1373 | |
b0246b3b | 1374 | struct minimal_symbol *msymbol; |
a608f919 | 1375 | char **bkpt_namep; |
464c6c5f JL |
1376 | asection *interp_sect; |
1377 | ||
1378 | /* First, remove all the solib event breakpoints. Their addresses | |
1379 | may have changed since the last time we ran the program. */ | |
1380 | remove_solib_event_breakpoints (); | |
1381 | ||
1382 | #ifdef SVR4_SHARED_LIBS | |
1383 | /* Find the .interp section; if not found, warn the user and drop | |
1384 | into the old breakpoint at symbol code. */ | |
1385 | interp_sect = bfd_get_section_by_name (exec_bfd, ".interp"); | |
1386 | if (interp_sect) | |
1387 | { | |
1388 | unsigned int interp_sect_size; | |
1389 | char *buf; | |
1390 | CORE_ADDR load_addr; | |
1391 | bfd *tmp_bfd; | |
11be829f | 1392 | CORE_ADDR sym_addr = 0; |
464c6c5f JL |
1393 | |
1394 | /* Read the contents of the .interp section into a local buffer; | |
1395 | the contents specify the dynamic linker this program uses. */ | |
1396 | interp_sect_size = bfd_section_size (exec_bfd, interp_sect); | |
1397 | buf = alloca (interp_sect_size); | |
1398 | bfd_get_section_contents (exec_bfd, interp_sect, | |
1399 | buf, 0, interp_sect_size); | |
1400 | ||
1401 | /* Now we need to figure out where the dynamic linker was | |
1402 | loaded so that we can load its symbols and place a breakpoint | |
1403 | in the dynamic linker itself. | |
1404 | ||
1405 | This address is stored on the stack. However, I've been unable | |
1406 | to find any magic formula to find it for Solaris (appears to | |
1407 | be trivial on Linux). Therefore, we have to try an alternate | |
1408 | mechanism to find the dynamic linker's base address. */ | |
1409 | tmp_bfd = bfd_openr (buf, gnutarget); | |
1410 | if (tmp_bfd == NULL) | |
1411 | goto bkpt_at_symbol; | |
1412 | ||
1413 | /* Make sure the dynamic linker's really a useful object. */ | |
1414 | if (!bfd_check_format (tmp_bfd, bfd_object)) | |
1415 | { | |
1416 | warning ("Unable to grok dynamic linker %s as an object file", buf); | |
1417 | bfd_close (tmp_bfd); | |
1418 | goto bkpt_at_symbol; | |
1419 | } | |
1420 | ||
1421 | /* We find the dynamic linker's base address by examining the | |
1422 | current pc (which point at the entry point for the dynamic | |
1423 | linker) and subtracting the offset of the entry point. */ | |
1424 | load_addr = read_pc () - tmp_bfd->start_address; | |
1425 | ||
11be829f JL |
1426 | /* Now try to set a breakpoint in the dynamic linker. */ |
1427 | for (bkpt_namep = solib_break_names; *bkpt_namep != NULL; bkpt_namep++) | |
464c6c5f | 1428 | { |
11be829f JL |
1429 | sym_addr = bfd_lookup_symbol (tmp_bfd, *bkpt_namep); |
1430 | if (sym_addr != 0) | |
1431 | break; | |
464c6c5f JL |
1432 | } |
1433 | ||
464c6c5f JL |
1434 | /* We're done with the temporary bfd. */ |
1435 | bfd_close (tmp_bfd); | |
1436 | ||
11be829f | 1437 | if (sym_addr != 0) |
464c6c5f | 1438 | { |
11be829f JL |
1439 | create_solib_event_breakpoint (load_addr + sym_addr); |
1440 | return 1; | |
464c6c5f JL |
1441 | } |
1442 | ||
1443 | /* For whatever reason we couldn't set a breakpoint in the dynamic | |
1444 | linker. Warn and drop into the old code. */ | |
1445 | bkpt_at_symbol: | |
1446 | warning ("Unable to find dynamic linker breakpoint function."); | |
1447 | warning ("GDB will be unable to debug shared library initializers"); | |
1448 | warning ("and track explicitly loaded dynamic code."); | |
1449 | } | |
1450 | #endif | |
f8b76e70 | 1451 | |
a608f919 FF |
1452 | /* Scan through the list of symbols, trying to look up the symbol and |
1453 | set a breakpoint there. Terminate loop when we/if we succeed. */ | |
f8b76e70 | 1454 | |
a608f919 FF |
1455 | breakpoint_addr = 0; |
1456 | for (bkpt_namep = bkpt_names; *bkpt_namep != NULL; bkpt_namep++) | |
f8b76e70 | 1457 | { |
1a494973 | 1458 | msymbol = lookup_minimal_symbol (*bkpt_namep, NULL, symfile_objfile); |
a608f919 FF |
1459 | if ((msymbol != NULL) && (SYMBOL_VALUE_ADDRESS (msymbol) != 0)) |
1460 | { | |
464c6c5f JL |
1461 | create_solib_event_breakpoint (SYMBOL_VALUE_ADDRESS (msymbol)); |
1462 | return 1; | |
a608f919 | 1463 | } |
f8b76e70 FF |
1464 | } |
1465 | ||
464c6c5f JL |
1466 | /* Nothing good happened. */ |
1467 | return 0; | |
f8b76e70 | 1468 | |
a608f919 | 1469 | #endif /* BKPT_AT_SYMBOL */ |
f8b76e70 | 1470 | |
d261ece7 | 1471 | #endif /* !SVR4_SHARED_LIBS */ |
f8b76e70 | 1472 | |
a608f919 | 1473 | return (success); |
f8b76e70 FF |
1474 | } |
1475 | ||
1476 | /* | |
1477 | ||
1478 | GLOBAL FUNCTION | |
1479 | ||
1480 | solib_create_inferior_hook -- shared library startup support | |
1481 | ||
1482 | SYNOPSIS | |
1483 | ||
1484 | void solib_create_inferior_hook() | |
1485 | ||
1486 | DESCRIPTION | |
1487 | ||
1488 | When gdb starts up the inferior, it nurses it along (through the | |
1489 | shell) until it is ready to execute it's first instruction. At this | |
1490 | point, this function gets called via expansion of the macro | |
1491 | SOLIB_CREATE_INFERIOR_HOOK. | |
1492 | ||
a608f919 FF |
1493 | For SunOS executables, this first instruction is typically the |
1494 | one at "_start", or a similar text label, regardless of whether | |
1495 | the executable is statically or dynamically linked. The runtime | |
1496 | startup code takes care of dynamically linking in any shared | |
1497 | libraries, once gdb allows the inferior to continue. | |
1498 | ||
1499 | For SVR4 executables, this first instruction is either the first | |
1500 | instruction in the dynamic linker (for dynamically linked | |
1501 | executables) or the instruction at "start" for statically linked | |
1502 | executables. For dynamically linked executables, the system | |
1503 | first exec's /lib/libc.so.N, which contains the dynamic linker, | |
1504 | and starts it running. The dynamic linker maps in any needed | |
1505 | shared libraries, maps in the actual user executable, and then | |
1506 | jumps to "start" in the user executable. | |
1507 | ||
f8b76e70 FF |
1508 | For both SunOS shared libraries, and SVR4 shared libraries, we |
1509 | can arrange to cooperate with the dynamic linker to discover the | |
1510 | names of shared libraries that are dynamically linked, and the | |
1511 | base addresses to which they are linked. | |
1512 | ||
1513 | This function is responsible for discovering those names and | |
1514 | addresses, and saving sufficient information about them to allow | |
1515 | their symbols to be read at a later time. | |
1516 | ||
1517 | FIXME | |
1518 | ||
1519 | Between enable_break() and disable_break(), this code does not | |
1520 | properly handle hitting breakpoints which the user might have | |
1521 | set in the startup code or in the dynamic linker itself. Proper | |
1522 | handling will probably have to wait until the implementation is | |
1523 | changed to use the "breakpoint handler function" method. | |
1524 | ||
1525 | Also, what if child has exit()ed? Must exit loop somehow. | |
1526 | */ | |
1527 | ||
1528 | void | |
1529 | solib_create_inferior_hook() | |
1530 | { | |
ff56144e JK |
1531 | /* If we are using the BKPT_AT_SYMBOL code, then we don't need the base |
1532 | yet. In fact, in the case of a SunOS4 executable being run on | |
1533 | Solaris, we can't get it yet. find_solib will get it when it needs | |
1534 | it. */ | |
1535 | #if !(defined (SVR4_SHARED_LIBS) && defined (BKPT_AT_SYMBOL)) | |
f8b76e70 FF |
1536 | if ((debug_base = locate_base ()) == 0) |
1537 | { | |
1538 | /* Can't find the symbol or the executable is statically linked. */ | |
1539 | return; | |
1540 | } | |
ff56144e | 1541 | #endif |
f8b76e70 FF |
1542 | |
1543 | if (!enable_break ()) | |
1544 | { | |
1545 | warning ("shared library handler failed to enable breakpoint"); | |
1546 | return; | |
1547 | } | |
1548 | ||
13f6c7ea | 1549 | #ifndef SVR4_SHARED_LIBS |
464c6c5f JL |
1550 | /* Only SunOS needs the loop below, other systems should be using the |
1551 | special shared library breakpoints and the shared library breakpoint | |
1552 | service routine. | |
1553 | ||
1554 | Now run the target. It will eventually hit the breakpoint, at | |
f8b76e70 FF |
1555 | which point all of the libraries will have been mapped in and we |
1556 | can go groveling around in the dynamic linker structures to find | |
1557 | out what we need to know about them. */ | |
bdbd5f50 JG |
1558 | |
1559 | clear_proceed_status (); | |
1560 | stop_soon_quietly = 1; | |
4ad0021e | 1561 | stop_signal = TARGET_SIGNAL_0; |
f8b76e70 | 1562 | do |
bdbd5f50 | 1563 | { |
8d60affd | 1564 | target_resume (-1, 0, stop_signal); |
bdbd5f50 JG |
1565 | wait_for_inferior (); |
1566 | } | |
4ad0021e | 1567 | while (stop_signal != TARGET_SIGNAL_TRAP); |
bdbd5f50 | 1568 | stop_soon_quietly = 0; |
f8b76e70 FF |
1569 | |
1570 | /* We are now either at the "mapping complete" breakpoint (or somewhere | |
1571 | else, a condition we aren't prepared to deal with anyway), so adjust | |
1572 | the PC as necessary after a breakpoint, disable the breakpoint, and | |
1573 | add any shared libraries that were mapped in. */ | |
bdbd5f50 | 1574 | |
f8b76e70 FF |
1575 | if (DECR_PC_AFTER_BREAK) |
1576 | { | |
1577 | stop_pc -= DECR_PC_AFTER_BREAK; | |
1578 | write_register (PC_REGNUM, stop_pc); | |
1579 | } | |
1580 | ||
1581 | if (!disable_break ()) | |
1582 | { | |
1583 | warning ("shared library handler failed to disable breakpoint"); | |
1584 | } | |
1585 | ||
464c6c5f | 1586 | if (auto_solib_add) |
1a494973 | 1587 | solib_add ((char *) 0, 0, (struct target_ops *) 0); |
464c6c5f | 1588 | #endif |
bdbd5f50 JG |
1589 | } |
1590 | ||
f8b76e70 FF |
1591 | /* |
1592 | ||
b0246b3b FF |
1593 | LOCAL FUNCTION |
1594 | ||
1595 | special_symbol_handling -- additional shared library symbol handling | |
1596 | ||
1597 | SYNOPSIS | |
1598 | ||
1599 | void special_symbol_handling (struct so_list *so) | |
1600 | ||
1601 | DESCRIPTION | |
1602 | ||
1603 | Once the symbols from a shared object have been loaded in the usual | |
1604 | way, we are called to do any system specific symbol handling that | |
1605 | is needed. | |
1606 | ||
1a494973 C |
1607 | For SunOS4, this consists of grunging around in the dynamic |
1608 | linkers structures to find symbol definitions for "common" symbols | |
1609 | and adding them to the minimal symbol table for the runtime common | |
b0246b3b FF |
1610 | objfile. |
1611 | ||
1612 | */ | |
1613 | ||
1614 | static void | |
1615 | special_symbol_handling (so) | |
1616 | struct so_list *so; | |
1617 | { | |
1618 | #ifndef SVR4_SHARED_LIBS | |
51b57ded FF |
1619 | int j; |
1620 | ||
1621 | if (debug_addr == 0) | |
1622 | { | |
1623 | /* Get link_dynamic structure */ | |
1624 | ||
1625 | j = target_read_memory (debug_base, (char *) &dynamic_copy, | |
1626 | sizeof (dynamic_copy)); | |
1627 | if (j) | |
1628 | { | |
1629 | /* unreadable */ | |
1630 | return; | |
1631 | } | |
1632 | ||
1633 | /* Calc address of debugger interface structure */ | |
1634 | /* FIXME, this needs work for cross-debugging of core files | |
1635 | (byteorder, size, alignment, etc). */ | |
1636 | ||
1637 | debug_addr = (CORE_ADDR) dynamic_copy.ldd; | |
1638 | } | |
b0246b3b FF |
1639 | |
1640 | /* Read the debugger structure from the inferior, just to make sure | |
1641 | we have a current copy. */ | |
1642 | ||
51b57ded FF |
1643 | j = target_read_memory (debug_addr, (char *) &debug_copy, |
1644 | sizeof (debug_copy)); | |
1645 | if (j) | |
1646 | return; /* unreadable */ | |
b0246b3b FF |
1647 | |
1648 | /* Get common symbol definitions for the loaded object. */ | |
1649 | ||
1650 | if (debug_copy.ldd_cp) | |
1651 | { | |
1a494973 | 1652 | solib_add_common_symbols (debug_copy.ldd_cp); |
b0246b3b FF |
1653 | } |
1654 | ||
1655 | #endif /* !SVR4_SHARED_LIBS */ | |
1656 | } | |
1657 | ||
1658 | ||
1659 | /* | |
1660 | ||
1661 | LOCAL FUNCTION | |
f8b76e70 FF |
1662 | |
1663 | sharedlibrary_command -- handle command to explicitly add library | |
1664 | ||
1665 | SYNOPSIS | |
1666 | ||
b0246b3b | 1667 | static void sharedlibrary_command (char *args, int from_tty) |
f8b76e70 FF |
1668 | |
1669 | DESCRIPTION | |
1670 | ||
1671 | */ | |
1672 | ||
b0246b3b | 1673 | static void |
bdbd5f50 | 1674 | sharedlibrary_command (args, from_tty) |
f8b76e70 FF |
1675 | char *args; |
1676 | int from_tty; | |
bdbd5f50 | 1677 | { |
f8b76e70 FF |
1678 | dont_repeat (); |
1679 | solib_add (args, from_tty, (struct target_ops *) 0); | |
bd5635a1 RP |
1680 | } |
1681 | ||
1682 | void | |
1683 | _initialize_solib() | |
1684 | { | |
f8b76e70 FF |
1685 | |
1686 | add_com ("sharedlibrary", class_files, sharedlibrary_command, | |
bd5635a1 | 1687 | "Load shared object library symbols for files matching REGEXP."); |
f8b76e70 FF |
1688 | add_info ("sharedlibrary", info_sharedlibrary_command, |
1689 | "Status of loaded shared object libraries."); | |
1a494973 C |
1690 | |
1691 | add_show_from_set | |
1692 | (add_set_cmd ("auto-solib-add", class_support, var_zinteger, | |
464c6c5f JL |
1693 | (char *) &auto_solib_add, |
1694 | "Set autoloading of shared library symbols.\n\ | |
1a494973 | 1695 | If nonzero, symbols from all shared object libraries will be loaded\n\ |
464c6c5f JL |
1696 | automatically when the inferior begins execution or when the dynamic linker\n\ |
1697 | informs gdb that a new library has been loaded. Otherwise, symbols\n\ | |
1a494973 C |
1698 | must be loaded manually, using `sharedlibrary'.", |
1699 | &setlist), | |
1700 | &showlist); | |
bd5635a1 | 1701 | } |