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13437d4b | 1 | /* Handle SunOS and SVR4 shared libraries for GDB, the GNU Debugger. |
b6ba6518 KB |
2 | Copyright 1990, 1991, 1992, 1993, 1994, 1995, 1996, 1998, 1999, 2000, |
3 | 2001 | |
13437d4b KB |
4 | Free Software Foundation, Inc. |
5 | ||
6 | This file is part of GDB. | |
7 | ||
8 | This program is free software; you can redistribute it and/or modify | |
9 | it under the terms of the GNU General Public License as published by | |
10 | the Free Software Foundation; either version 2 of the License, or | |
11 | (at your option) any later version. | |
12 | ||
13 | This program is distributed in the hope that it will be useful, | |
14 | but WITHOUT ANY WARRANTY; without even the implied warranty of | |
15 | MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the | |
16 | GNU General Public License for more details. | |
17 | ||
18 | You should have received a copy of the GNU General Public License | |
19 | along with this program; if not, write to the Free Software | |
20 | Foundation, Inc., 59 Temple Place - Suite 330, | |
21 | Boston, MA 02111-1307, USA. */ | |
22 | ||
13437d4b | 23 | #include "defs.h" |
4e052eda | 24 | #include "regcache.h" |
13437d4b KB |
25 | |
26 | ||
27 | #include <sys/types.h> | |
28 | #include <signal.h> | |
29 | #include "gdb_string.h" | |
30 | #include <sys/param.h> | |
31 | #include <fcntl.h> | |
32 | ||
33 | #ifndef SVR4_SHARED_LIBS | |
34 | /* SunOS shared libs need the nlist structure. */ | |
35 | #include <a.out.h> | |
21479ded | 36 | #include <link.h> |
13437d4b KB |
37 | #else |
38 | #include "elf/external.h" | |
21479ded | 39 | #include "elf/common.h" |
f7856c8f | 40 | #include "elf/mips.h" |
13437d4b KB |
41 | #endif |
42 | ||
43 | #include "symtab.h" | |
44 | #include "bfd.h" | |
45 | #include "symfile.h" | |
46 | #include "objfiles.h" | |
47 | #include "gdbcore.h" | |
48 | #include "command.h" | |
49 | #include "target.h" | |
50 | #include "frame.h" | |
51 | #include "gdb_regex.h" | |
52 | #include "inferior.h" | |
53 | #include "environ.h" | |
54 | #include "language.h" | |
55 | #include "gdbcmd.h" | |
56 | ||
57 | #include "solist.h" | |
58 | #include "solib-svr4.h" | |
59 | ||
21479ded | 60 | #ifndef SVR4_FETCH_LINK_MAP_OFFSETS |
e5e2b9ff | 61 | #define SVR4_FETCH_LINK_MAP_OFFSETS() svr4_fetch_link_map_offsets () |
21479ded KB |
62 | #endif |
63 | ||
e5e2b9ff KB |
64 | static struct link_map_offsets *svr4_fetch_link_map_offsets (void); |
65 | static struct link_map_offsets *legacy_fetch_link_map_offsets (void); | |
1c4dcb57 | 66 | |
e5e2b9ff KB |
67 | /* fetch_link_map_offsets_gdbarch_data is a handle used to obtain the |
68 | architecture specific link map offsets fetching function. */ | |
21479ded | 69 | |
e5e2b9ff | 70 | static struct gdbarch_data *fetch_link_map_offsets_gdbarch_data; |
1c4dcb57 | 71 | |
21479ded KB |
72 | /* legacy_svr4_fetch_link_map_offsets_hook is a pointer to a function |
73 | which is used to fetch link map offsets. It will only be set | |
74 | by solib-legacy.c, if at all. */ | |
e5e2b9ff | 75 | |
21479ded KB |
76 | struct link_map_offsets *(*legacy_svr4_fetch_link_map_offsets_hook)(void) = 0; |
77 | ||
13437d4b KB |
78 | /* Link map info to include in an allocated so_list entry */ |
79 | ||
80 | struct lm_info | |
81 | { | |
82 | /* Pointer to copy of link map from inferior. The type is char * | |
83 | rather than void *, so that we may use byte offsets to find the | |
84 | various fields without the need for a cast. */ | |
85 | char *lm; | |
86 | }; | |
87 | ||
88 | /* On SVR4 systems, a list of symbols in the dynamic linker where | |
89 | GDB can try to place a breakpoint to monitor shared library | |
90 | events. | |
91 | ||
92 | If none of these symbols are found, or other errors occur, then | |
93 | SVR4 systems will fall back to using a symbol as the "startup | |
94 | mapping complete" breakpoint address. */ | |
95 | ||
96 | #ifdef SVR4_SHARED_LIBS | |
97 | static char *solib_break_names[] = | |
98 | { | |
99 | "r_debug_state", | |
100 | "_r_debug_state", | |
101 | "_dl_debug_state", | |
102 | "rtld_db_dlactivity", | |
1f72e589 | 103 | "_rtld_debug_state", |
13437d4b KB |
104 | NULL |
105 | }; | |
106 | #endif | |
107 | ||
108 | #define BKPT_AT_SYMBOL 1 | |
109 | ||
110 | #if defined (BKPT_AT_SYMBOL) && defined (SVR4_SHARED_LIBS) | |
111 | static char *bkpt_names[] = | |
112 | { | |
113 | #ifdef SOLIB_BKPT_NAME | |
114 | SOLIB_BKPT_NAME, /* Prefer configured name if it exists. */ | |
115 | #endif | |
116 | "_start", | |
117 | "main", | |
118 | NULL | |
119 | }; | |
120 | #endif | |
121 | ||
122 | /* Symbols which are used to locate the base of the link map structures. */ | |
123 | ||
124 | #ifndef SVR4_SHARED_LIBS | |
125 | static char *debug_base_symbols[] = | |
126 | { | |
127 | "_DYNAMIC", | |
128 | "_DYNAMIC__MGC", | |
129 | NULL | |
130 | }; | |
131 | #endif | |
132 | ||
133 | static char *main_name_list[] = | |
134 | { | |
135 | "main_$main", | |
136 | NULL | |
137 | }; | |
138 | ||
139 | ||
13437d4b KB |
140 | /* Macro to extract an address from a solib structure. |
141 | When GDB is configured for some 32-bit targets (e.g. Solaris 2.7 | |
142 | sparc), BFD is configured to handle 64-bit targets, so CORE_ADDR is | |
143 | 64 bits. We have to extract only the significant bits of addresses | |
144 | to get the right address when accessing the core file BFD. */ | |
145 | ||
146 | #define SOLIB_EXTRACT_ADDRESS(MEMBER) \ | |
147 | extract_address (&(MEMBER), sizeof (MEMBER)) | |
148 | ||
149 | /* local data declarations */ | |
150 | ||
151 | #ifndef SVR4_SHARED_LIBS | |
152 | ||
153 | /* NOTE: converted the macros LM_ADDR, LM_NEXT, LM_NAME and | |
154 | IGNORE_FIRST_LINK_MAP_ENTRY into functions (see below). | |
155 | MVS, June 2000 */ | |
156 | ||
157 | static struct link_dynamic dynamic_copy; | |
158 | static struct link_dynamic_2 ld_2_copy; | |
159 | static struct ld_debug debug_copy; | |
160 | static CORE_ADDR debug_addr; | |
161 | static CORE_ADDR flag_addr; | |
162 | ||
163 | #endif /* !SVR4_SHARED_LIBS */ | |
164 | ||
165 | /* link map access functions */ | |
166 | ||
167 | static CORE_ADDR | |
168 | LM_ADDR (struct so_list *so) | |
169 | { | |
170 | struct link_map_offsets *lmo = SVR4_FETCH_LINK_MAP_OFFSETS (); | |
171 | ||
58bc91c9 MH |
172 | return (CORE_ADDR) extract_signed_integer (so->lm_info->lm + lmo->l_addr_offset, |
173 | lmo->l_addr_size); | |
13437d4b KB |
174 | } |
175 | ||
176 | static CORE_ADDR | |
177 | LM_NEXT (struct so_list *so) | |
178 | { | |
179 | struct link_map_offsets *lmo = SVR4_FETCH_LINK_MAP_OFFSETS (); | |
180 | ||
181 | return extract_address (so->lm_info->lm + lmo->l_next_offset, lmo->l_next_size); | |
182 | } | |
183 | ||
184 | static CORE_ADDR | |
185 | LM_NAME (struct so_list *so) | |
186 | { | |
187 | struct link_map_offsets *lmo = SVR4_FETCH_LINK_MAP_OFFSETS (); | |
188 | ||
189 | return extract_address (so->lm_info->lm + lmo->l_name_offset, lmo->l_name_size); | |
190 | } | |
191 | ||
192 | #ifndef SVR4_SHARED_LIBS | |
193 | ||
194 | static int | |
195 | IGNORE_FIRST_LINK_MAP_ENTRY (struct so_list *so) | |
196 | { | |
197 | return 0; | |
198 | } | |
199 | ||
200 | #else /* SVR4_SHARED_LIBS */ | |
201 | ||
202 | static int | |
203 | IGNORE_FIRST_LINK_MAP_ENTRY (struct so_list *so) | |
204 | { | |
205 | struct link_map_offsets *lmo = SVR4_FETCH_LINK_MAP_OFFSETS (); | |
206 | ||
207 | return extract_address (so->lm_info->lm + lmo->l_prev_offset, | |
208 | lmo->l_prev_size) == 0; | |
209 | } | |
210 | ||
211 | #endif /* !SVR4_SHARED_LIBS */ | |
212 | ||
13437d4b KB |
213 | static CORE_ADDR debug_base; /* Base of dynamic linker structures */ |
214 | static CORE_ADDR breakpoint_addr; /* Address where end bkpt is set */ | |
215 | ||
216 | /* Local function prototypes */ | |
217 | ||
218 | static int match_main (char *); | |
219 | ||
13437d4b KB |
220 | #ifndef SVR4_SHARED_LIBS |
221 | ||
222 | /* Allocate the runtime common object file. */ | |
223 | ||
224 | static void | |
225 | allocate_rt_common_objfile (void) | |
226 | { | |
227 | struct objfile *objfile; | |
228 | struct objfile *last_one; | |
229 | ||
230 | objfile = (struct objfile *) xmalloc (sizeof (struct objfile)); | |
231 | memset (objfile, 0, sizeof (struct objfile)); | |
232 | objfile->md = NULL; | |
233 | obstack_specify_allocation (&objfile->psymbol_cache.cache, 0, 0, | |
b8c9b27d | 234 | xmalloc, xfree); |
13437d4b | 235 | obstack_specify_allocation (&objfile->psymbol_obstack, 0, 0, xmalloc, |
b8c9b27d | 236 | xfree); |
13437d4b | 237 | obstack_specify_allocation (&objfile->symbol_obstack, 0, 0, xmalloc, |
b8c9b27d | 238 | xfree); |
13437d4b | 239 | obstack_specify_allocation (&objfile->type_obstack, 0, 0, xmalloc, |
b8c9b27d | 240 | xfree); |
13437d4b KB |
241 | objfile->name = mstrsave (objfile->md, "rt_common"); |
242 | ||
243 | /* Add this file onto the tail of the linked list of other such files. */ | |
244 | ||
245 | objfile->next = NULL; | |
246 | if (object_files == NULL) | |
247 | object_files = objfile; | |
248 | else | |
249 | { | |
250 | for (last_one = object_files; | |
251 | last_one->next; | |
252 | last_one = last_one->next); | |
253 | last_one->next = objfile; | |
254 | } | |
255 | ||
256 | rt_common_objfile = objfile; | |
257 | } | |
258 | ||
259 | /* Read all dynamically loaded common symbol definitions from the inferior | |
260 | and put them into the minimal symbol table for the runtime common | |
261 | objfile. */ | |
262 | ||
263 | static void | |
264 | solib_add_common_symbols (CORE_ADDR rtc_symp) | |
265 | { | |
266 | struct rtc_symb inferior_rtc_symb; | |
267 | struct nlist inferior_rtc_nlist; | |
268 | int len; | |
269 | char *name; | |
270 | ||
271 | /* Remove any runtime common symbols from previous runs. */ | |
272 | ||
273 | if (rt_common_objfile != NULL && rt_common_objfile->minimal_symbol_count) | |
274 | { | |
275 | obstack_free (&rt_common_objfile->symbol_obstack, 0); | |
276 | obstack_specify_allocation (&rt_common_objfile->symbol_obstack, 0, 0, | |
b8c9b27d | 277 | xmalloc, xfree); |
13437d4b KB |
278 | rt_common_objfile->minimal_symbol_count = 0; |
279 | rt_common_objfile->msymbols = NULL; | |
280 | } | |
281 | ||
282 | init_minimal_symbol_collection (); | |
283 | make_cleanup_discard_minimal_symbols (); | |
284 | ||
285 | while (rtc_symp) | |
286 | { | |
287 | read_memory (rtc_symp, | |
288 | (char *) &inferior_rtc_symb, | |
289 | sizeof (inferior_rtc_symb)); | |
290 | read_memory (SOLIB_EXTRACT_ADDRESS (inferior_rtc_symb.rtc_sp), | |
291 | (char *) &inferior_rtc_nlist, | |
292 | sizeof (inferior_rtc_nlist)); | |
293 | if (inferior_rtc_nlist.n_type == N_COMM) | |
294 | { | |
295 | /* FIXME: The length of the symbol name is not available, but in the | |
296 | current implementation the common symbol is allocated immediately | |
297 | behind the name of the symbol. */ | |
298 | len = inferior_rtc_nlist.n_value - inferior_rtc_nlist.n_un.n_strx; | |
299 | ||
300 | name = xmalloc (len); | |
301 | read_memory (SOLIB_EXTRACT_ADDRESS (inferior_rtc_nlist.n_un.n_name), | |
302 | name, len); | |
303 | ||
304 | /* Allocate the runtime common objfile if necessary. */ | |
305 | if (rt_common_objfile == NULL) | |
306 | allocate_rt_common_objfile (); | |
307 | ||
308 | prim_record_minimal_symbol (name, inferior_rtc_nlist.n_value, | |
309 | mst_bss, rt_common_objfile); | |
b8c9b27d | 310 | xfree (name); |
13437d4b KB |
311 | } |
312 | rtc_symp = SOLIB_EXTRACT_ADDRESS (inferior_rtc_symb.rtc_next); | |
313 | } | |
314 | ||
315 | /* Install any minimal symbols that have been collected as the current | |
316 | minimal symbols for the runtime common objfile. */ | |
317 | ||
318 | install_minimal_symbols (rt_common_objfile); | |
319 | } | |
320 | ||
321 | #endif /* SVR4_SHARED_LIBS */ | |
322 | ||
323 | ||
324 | #ifdef SVR4_SHARED_LIBS | |
325 | ||
326 | static CORE_ADDR bfd_lookup_symbol (bfd *, char *); | |
327 | ||
328 | /* | |
329 | ||
330 | LOCAL FUNCTION | |
331 | ||
332 | bfd_lookup_symbol -- lookup the value for a specific symbol | |
333 | ||
334 | SYNOPSIS | |
335 | ||
336 | CORE_ADDR bfd_lookup_symbol (bfd *abfd, char *symname) | |
337 | ||
338 | DESCRIPTION | |
339 | ||
340 | An expensive way to lookup the value of a single symbol for | |
341 | bfd's that are only temporary anyway. This is used by the | |
342 | shared library support to find the address of the debugger | |
343 | interface structures in the shared library. | |
344 | ||
345 | Note that 0 is specifically allowed as an error return (no | |
346 | such symbol). | |
347 | */ | |
348 | ||
349 | static CORE_ADDR | |
350 | bfd_lookup_symbol (bfd *abfd, char *symname) | |
351 | { | |
435b259c | 352 | long storage_needed; |
13437d4b KB |
353 | asymbol *sym; |
354 | asymbol **symbol_table; | |
355 | unsigned int number_of_symbols; | |
356 | unsigned int i; | |
357 | struct cleanup *back_to; | |
358 | CORE_ADDR symaddr = 0; | |
359 | ||
360 | storage_needed = bfd_get_symtab_upper_bound (abfd); | |
361 | ||
362 | if (storage_needed > 0) | |
363 | { | |
364 | symbol_table = (asymbol **) xmalloc (storage_needed); | |
b8c9b27d | 365 | back_to = make_cleanup (xfree, (PTR) symbol_table); |
13437d4b KB |
366 | number_of_symbols = bfd_canonicalize_symtab (abfd, symbol_table); |
367 | ||
368 | for (i = 0; i < number_of_symbols; i++) | |
369 | { | |
370 | sym = *symbol_table++; | |
371 | if (STREQ (sym->name, symname)) | |
372 | { | |
373 | /* Bfd symbols are section relative. */ | |
374 | symaddr = sym->value + sym->section->vma; | |
375 | break; | |
376 | } | |
377 | } | |
378 | do_cleanups (back_to); | |
379 | } | |
380 | ||
381 | if (symaddr) | |
382 | return symaddr; | |
383 | ||
384 | /* On FreeBSD, the dynamic linker is stripped by default. So we'll | |
385 | have to check the dynamic string table too. */ | |
386 | ||
387 | storage_needed = bfd_get_dynamic_symtab_upper_bound (abfd); | |
388 | ||
389 | if (storage_needed > 0) | |
390 | { | |
391 | symbol_table = (asymbol **) xmalloc (storage_needed); | |
b8c9b27d | 392 | back_to = make_cleanup (xfree, (PTR) symbol_table); |
13437d4b KB |
393 | number_of_symbols = bfd_canonicalize_dynamic_symtab (abfd, symbol_table); |
394 | ||
395 | for (i = 0; i < number_of_symbols; i++) | |
396 | { | |
397 | sym = *symbol_table++; | |
398 | if (STREQ (sym->name, symname)) | |
399 | { | |
400 | /* Bfd symbols are section relative. */ | |
401 | symaddr = sym->value + sym->section->vma; | |
402 | break; | |
403 | } | |
404 | } | |
405 | do_cleanups (back_to); | |
406 | } | |
407 | ||
408 | return symaddr; | |
409 | } | |
410 | ||
411 | #ifdef HANDLE_SVR4_EXEC_EMULATORS | |
412 | ||
413 | /* | |
414 | Solaris BCP (the part of Solaris which allows it to run SunOS4 | |
415 | a.out files) throws in another wrinkle. Solaris does not fill | |
416 | in the usual a.out link map structures when running BCP programs, | |
417 | the only way to get at them is via groping around in the dynamic | |
418 | linker. | |
419 | The dynamic linker and it's structures are located in the shared | |
420 | C library, which gets run as the executable's "interpreter" by | |
421 | the kernel. | |
422 | ||
423 | Note that we can assume nothing about the process state at the time | |
424 | we need to find these structures. We may be stopped on the first | |
425 | instruction of the interpreter (C shared library), the first | |
426 | instruction of the executable itself, or somewhere else entirely | |
427 | (if we attached to the process for example). | |
428 | */ | |
429 | ||
430 | static char *debug_base_symbols[] = | |
431 | { | |
432 | "r_debug", /* Solaris 2.3 */ | |
433 | "_r_debug", /* Solaris 2.1, 2.2 */ | |
434 | NULL | |
435 | }; | |
436 | ||
437 | static int look_for_base (int, CORE_ADDR); | |
438 | ||
439 | /* | |
440 | ||
441 | LOCAL FUNCTION | |
442 | ||
443 | look_for_base -- examine file for each mapped address segment | |
444 | ||
445 | SYNOPSYS | |
446 | ||
447 | static int look_for_base (int fd, CORE_ADDR baseaddr) | |
448 | ||
449 | DESCRIPTION | |
450 | ||
451 | This function is passed to proc_iterate_over_mappings, which | |
452 | causes it to get called once for each mapped address space, with | |
453 | an open file descriptor for the file mapped to that space, and the | |
454 | base address of that mapped space. | |
455 | ||
456 | Our job is to find the debug base symbol in the file that this | |
457 | fd is open on, if it exists, and if so, initialize the dynamic | |
458 | linker structure base address debug_base. | |
459 | ||
460 | Note that this is a computationally expensive proposition, since | |
461 | we basically have to open a bfd on every call, so we specifically | |
462 | avoid opening the exec file. | |
463 | */ | |
464 | ||
465 | static int | |
466 | look_for_base (int fd, CORE_ADDR baseaddr) | |
467 | { | |
468 | bfd *interp_bfd; | |
469 | CORE_ADDR address = 0; | |
470 | char **symbolp; | |
471 | ||
472 | /* If the fd is -1, then there is no file that corresponds to this | |
473 | mapped memory segment, so skip it. Also, if the fd corresponds | |
474 | to the exec file, skip it as well. */ | |
475 | ||
476 | if (fd == -1 | |
477 | || (exec_bfd != NULL | |
478 | && fdmatch (fileno ((FILE *) (exec_bfd->iostream)), fd))) | |
479 | { | |
480 | return (0); | |
481 | } | |
482 | ||
483 | /* Try to open whatever random file this fd corresponds to. Note that | |
484 | we have no way currently to find the filename. Don't gripe about | |
485 | any problems we might have, just fail. */ | |
486 | ||
487 | if ((interp_bfd = bfd_fdopenr ("unnamed", gnutarget, fd)) == NULL) | |
488 | { | |
489 | return (0); | |
490 | } | |
491 | if (!bfd_check_format (interp_bfd, bfd_object)) | |
492 | { | |
493 | /* FIXME-leak: on failure, might not free all memory associated with | |
494 | interp_bfd. */ | |
495 | bfd_close (interp_bfd); | |
496 | return (0); | |
497 | } | |
498 | ||
499 | /* Now try to find our debug base symbol in this file, which we at | |
500 | least know to be a valid ELF executable or shared library. */ | |
501 | ||
502 | for (symbolp = debug_base_symbols; *symbolp != NULL; symbolp++) | |
503 | { | |
504 | address = bfd_lookup_symbol (interp_bfd, *symbolp); | |
505 | if (address != 0) | |
506 | { | |
507 | break; | |
508 | } | |
509 | } | |
510 | if (address == 0) | |
511 | { | |
512 | /* FIXME-leak: on failure, might not free all memory associated with | |
513 | interp_bfd. */ | |
514 | bfd_close (interp_bfd); | |
515 | return (0); | |
516 | } | |
517 | ||
518 | /* Eureka! We found the symbol. But now we may need to relocate it | |
519 | by the base address. If the symbol's value is less than the base | |
520 | address of the shared library, then it hasn't yet been relocated | |
521 | by the dynamic linker, and we have to do it ourself. FIXME: Note | |
522 | that we make the assumption that the first segment that corresponds | |
523 | to the shared library has the base address to which the library | |
524 | was relocated. */ | |
525 | ||
526 | if (address < baseaddr) | |
527 | { | |
528 | address += baseaddr; | |
529 | } | |
530 | debug_base = address; | |
531 | /* FIXME-leak: on failure, might not free all memory associated with | |
532 | interp_bfd. */ | |
533 | bfd_close (interp_bfd); | |
534 | return (1); | |
535 | } | |
536 | #endif /* HANDLE_SVR4_EXEC_EMULATORS */ | |
537 | ||
538 | /* | |
539 | ||
540 | LOCAL FUNCTION | |
541 | ||
542 | elf_locate_base -- locate the base address of dynamic linker structs | |
543 | for SVR4 elf targets. | |
544 | ||
545 | SYNOPSIS | |
546 | ||
547 | CORE_ADDR elf_locate_base (void) | |
548 | ||
549 | DESCRIPTION | |
550 | ||
551 | For SVR4 elf targets the address of the dynamic linker's runtime | |
552 | structure is contained within the dynamic info section in the | |
553 | executable file. The dynamic section is also mapped into the | |
554 | inferior address space. Because the runtime loader fills in the | |
555 | real address before starting the inferior, we have to read in the | |
556 | dynamic info section from the inferior address space. | |
557 | If there are any errors while trying to find the address, we | |
558 | silently return 0, otherwise the found address is returned. | |
559 | ||
560 | */ | |
561 | ||
562 | static CORE_ADDR | |
563 | elf_locate_base (void) | |
564 | { | |
565 | sec_ptr dyninfo_sect; | |
566 | int dyninfo_sect_size; | |
567 | CORE_ADDR dyninfo_addr; | |
568 | char *buf; | |
569 | char *bufend; | |
570 | int arch_size; | |
571 | ||
572 | /* Find the start address of the .dynamic section. */ | |
573 | dyninfo_sect = bfd_get_section_by_name (exec_bfd, ".dynamic"); | |
574 | if (dyninfo_sect == NULL) | |
575 | return 0; | |
576 | dyninfo_addr = bfd_section_vma (exec_bfd, dyninfo_sect); | |
577 | ||
578 | /* Read in .dynamic section, silently ignore errors. */ | |
579 | dyninfo_sect_size = bfd_section_size (exec_bfd, dyninfo_sect); | |
580 | buf = alloca (dyninfo_sect_size); | |
581 | if (target_read_memory (dyninfo_addr, buf, dyninfo_sect_size)) | |
582 | return 0; | |
583 | ||
584 | /* Find the DT_DEBUG entry in the the .dynamic section. | |
585 | For mips elf we look for DT_MIPS_RLD_MAP, mips elf apparently has | |
586 | no DT_DEBUG entries. */ | |
587 | ||
588 | arch_size = bfd_get_arch_size (exec_bfd); | |
589 | if (arch_size == -1) /* failure */ | |
590 | return 0; | |
591 | ||
592 | if (arch_size == 32) | |
593 | { /* 32-bit elf */ | |
594 | for (bufend = buf + dyninfo_sect_size; | |
595 | buf < bufend; | |
596 | buf += sizeof (Elf32_External_Dyn)) | |
597 | { | |
598 | Elf32_External_Dyn *x_dynp = (Elf32_External_Dyn *) buf; | |
599 | long dyn_tag; | |
600 | CORE_ADDR dyn_ptr; | |
601 | ||
602 | dyn_tag = bfd_h_get_32 (exec_bfd, (bfd_byte *) x_dynp->d_tag); | |
603 | if (dyn_tag == DT_NULL) | |
604 | break; | |
605 | else if (dyn_tag == DT_DEBUG) | |
606 | { | |
607 | dyn_ptr = bfd_h_get_32 (exec_bfd, | |
608 | (bfd_byte *) x_dynp->d_un.d_ptr); | |
609 | return dyn_ptr; | |
610 | } | |
13437d4b KB |
611 | else if (dyn_tag == DT_MIPS_RLD_MAP) |
612 | { | |
613 | char *pbuf; | |
614 | ||
615 | pbuf = alloca (TARGET_PTR_BIT / HOST_CHAR_BIT); | |
616 | /* DT_MIPS_RLD_MAP contains a pointer to the address | |
617 | of the dynamic link structure. */ | |
618 | dyn_ptr = bfd_h_get_32 (exec_bfd, | |
619 | (bfd_byte *) x_dynp->d_un.d_ptr); | |
620 | if (target_read_memory (dyn_ptr, pbuf, sizeof (pbuf))) | |
621 | return 0; | |
622 | return extract_unsigned_integer (pbuf, sizeof (pbuf)); | |
623 | } | |
13437d4b KB |
624 | } |
625 | } | |
626 | else /* 64-bit elf */ | |
627 | { | |
628 | for (bufend = buf + dyninfo_sect_size; | |
629 | buf < bufend; | |
630 | buf += sizeof (Elf64_External_Dyn)) | |
631 | { | |
632 | Elf64_External_Dyn *x_dynp = (Elf64_External_Dyn *) buf; | |
633 | long dyn_tag; | |
634 | CORE_ADDR dyn_ptr; | |
635 | ||
636 | dyn_tag = bfd_h_get_64 (exec_bfd, (bfd_byte *) x_dynp->d_tag); | |
637 | if (dyn_tag == DT_NULL) | |
638 | break; | |
639 | else if (dyn_tag == DT_DEBUG) | |
640 | { | |
641 | dyn_ptr = bfd_h_get_64 (exec_bfd, | |
642 | (bfd_byte *) x_dynp->d_un.d_ptr); | |
643 | return dyn_ptr; | |
644 | } | |
645 | } | |
646 | } | |
647 | ||
648 | /* DT_DEBUG entry not found. */ | |
649 | return 0; | |
650 | } | |
651 | ||
652 | #endif /* SVR4_SHARED_LIBS */ | |
653 | ||
654 | /* | |
655 | ||
656 | LOCAL FUNCTION | |
657 | ||
658 | locate_base -- locate the base address of dynamic linker structs | |
659 | ||
660 | SYNOPSIS | |
661 | ||
662 | CORE_ADDR locate_base (void) | |
663 | ||
664 | DESCRIPTION | |
665 | ||
666 | For both the SunOS and SVR4 shared library implementations, if the | |
667 | inferior executable has been linked dynamically, there is a single | |
668 | address somewhere in the inferior's data space which is the key to | |
669 | locating all of the dynamic linker's runtime structures. This | |
670 | address is the value of the debug base symbol. The job of this | |
671 | function is to find and return that address, or to return 0 if there | |
672 | is no such address (the executable is statically linked for example). | |
673 | ||
674 | For SunOS, the job is almost trivial, since the dynamic linker and | |
675 | all of it's structures are statically linked to the executable at | |
676 | link time. Thus the symbol for the address we are looking for has | |
677 | already been added to the minimal symbol table for the executable's | |
678 | objfile at the time the symbol file's symbols were read, and all we | |
679 | have to do is look it up there. Note that we explicitly do NOT want | |
680 | to find the copies in the shared library. | |
681 | ||
682 | The SVR4 version is a bit more complicated because the address | |
683 | is contained somewhere in the dynamic info section. We have to go | |
684 | to a lot more work to discover the address of the debug base symbol. | |
685 | Because of this complexity, we cache the value we find and return that | |
686 | value on subsequent invocations. Note there is no copy in the | |
687 | executable symbol tables. | |
688 | ||
689 | */ | |
690 | ||
691 | static CORE_ADDR | |
692 | locate_base (void) | |
693 | { | |
694 | ||
695 | #ifndef SVR4_SHARED_LIBS | |
696 | ||
697 | struct minimal_symbol *msymbol; | |
698 | CORE_ADDR address = 0; | |
699 | char **symbolp; | |
700 | ||
701 | /* For SunOS, we want to limit the search for the debug base symbol to the | |
702 | executable being debugged, since there is a duplicate named symbol in the | |
703 | shared library. We don't want the shared library versions. */ | |
704 | ||
705 | for (symbolp = debug_base_symbols; *symbolp != NULL; symbolp++) | |
706 | { | |
707 | msymbol = lookup_minimal_symbol (*symbolp, NULL, symfile_objfile); | |
708 | if ((msymbol != NULL) && (SYMBOL_VALUE_ADDRESS (msymbol) != 0)) | |
709 | { | |
710 | address = SYMBOL_VALUE_ADDRESS (msymbol); | |
711 | return (address); | |
712 | } | |
713 | } | |
714 | return (0); | |
715 | ||
716 | #else /* SVR4_SHARED_LIBS */ | |
717 | ||
718 | /* Check to see if we have a currently valid address, and if so, avoid | |
719 | doing all this work again and just return the cached address. If | |
720 | we have no cached address, try to locate it in the dynamic info | |
721 | section for ELF executables. */ | |
722 | ||
723 | if (debug_base == 0) | |
724 | { | |
725 | if (exec_bfd != NULL | |
726 | && bfd_get_flavour (exec_bfd) == bfd_target_elf_flavour) | |
727 | debug_base = elf_locate_base (); | |
728 | #ifdef HANDLE_SVR4_EXEC_EMULATORS | |
729 | /* Try it the hard way for emulated executables. */ | |
39f77062 | 730 | else if (!ptid_equal (inferior_ptid, null_ptid) && target_has_execution) |
13437d4b KB |
731 | proc_iterate_over_mappings (look_for_base); |
732 | #endif | |
733 | } | |
734 | return (debug_base); | |
735 | ||
736 | #endif /* !SVR4_SHARED_LIBS */ | |
737 | ||
738 | } | |
739 | ||
740 | /* | |
741 | ||
742 | LOCAL FUNCTION | |
743 | ||
744 | first_link_map_member -- locate first member in dynamic linker's map | |
745 | ||
746 | SYNOPSIS | |
747 | ||
748 | static CORE_ADDR first_link_map_member (void) | |
749 | ||
750 | DESCRIPTION | |
751 | ||
752 | Find the first element in the inferior's dynamic link map, and | |
753 | return its address in the inferior. This function doesn't copy the | |
754 | link map entry itself into our address space; current_sos actually | |
755 | does the reading. */ | |
756 | ||
757 | static CORE_ADDR | |
758 | first_link_map_member (void) | |
759 | { | |
760 | CORE_ADDR lm = 0; | |
761 | ||
762 | #ifndef SVR4_SHARED_LIBS | |
763 | ||
764 | read_memory (debug_base, (char *) &dynamic_copy, sizeof (dynamic_copy)); | |
765 | if (dynamic_copy.ld_version >= 2) | |
766 | { | |
767 | /* It is a version that we can deal with, so read in the secondary | |
768 | structure and find the address of the link map list from it. */ | |
769 | read_memory (SOLIB_EXTRACT_ADDRESS (dynamic_copy.ld_un.ld_2), | |
770 | (char *) &ld_2_copy, sizeof (struct link_dynamic_2)); | |
771 | lm = SOLIB_EXTRACT_ADDRESS (ld_2_copy.ld_loaded); | |
772 | } | |
773 | ||
774 | #else /* SVR4_SHARED_LIBS */ | |
775 | struct link_map_offsets *lmo = SVR4_FETCH_LINK_MAP_OFFSETS (); | |
776 | char *r_map_buf = xmalloc (lmo->r_map_size); | |
b8c9b27d | 777 | struct cleanup *cleanups = make_cleanup (xfree, r_map_buf); |
13437d4b KB |
778 | |
779 | read_memory (debug_base + lmo->r_map_offset, r_map_buf, lmo->r_map_size); | |
780 | ||
781 | lm = extract_address (r_map_buf, lmo->r_map_size); | |
782 | ||
783 | /* FIXME: Perhaps we should validate the info somehow, perhaps by | |
784 | checking r_version for a known version number, or r_state for | |
785 | RT_CONSISTENT. */ | |
786 | ||
787 | do_cleanups (cleanups); | |
788 | ||
789 | #endif /* !SVR4_SHARED_LIBS */ | |
790 | ||
791 | return (lm); | |
792 | } | |
793 | ||
794 | #ifdef SVR4_SHARED_LIBS | |
795 | /* | |
796 | ||
797 | LOCAL FUNCTION | |
798 | ||
799 | open_symbol_file_object | |
800 | ||
801 | SYNOPSIS | |
802 | ||
803 | void open_symbol_file_object (void *from_tty) | |
804 | ||
805 | DESCRIPTION | |
806 | ||
807 | If no open symbol file, attempt to locate and open the main symbol | |
808 | file. On SVR4 systems, this is the first link map entry. If its | |
809 | name is here, we can open it. Useful when attaching to a process | |
810 | without first loading its symbol file. | |
811 | ||
812 | If FROM_TTYP dereferences to a non-zero integer, allow messages to | |
813 | be printed. This parameter is a pointer rather than an int because | |
814 | open_symbol_file_object() is called via catch_errors() and | |
815 | catch_errors() requires a pointer argument. */ | |
816 | ||
817 | static int | |
818 | open_symbol_file_object (void *from_ttyp) | |
819 | { | |
820 | CORE_ADDR lm, l_name; | |
821 | char *filename; | |
822 | int errcode; | |
823 | int from_tty = *(int *)from_ttyp; | |
824 | struct link_map_offsets *lmo = SVR4_FETCH_LINK_MAP_OFFSETS (); | |
825 | char *l_name_buf = xmalloc (lmo->l_name_size); | |
b8c9b27d | 826 | struct cleanup *cleanups = make_cleanup (xfree, l_name_buf); |
13437d4b KB |
827 | |
828 | if (symfile_objfile) | |
829 | if (!query ("Attempt to reload symbols from process? ")) | |
830 | return 0; | |
831 | ||
832 | if ((debug_base = locate_base ()) == 0) | |
833 | return 0; /* failed somehow... */ | |
834 | ||
835 | /* First link map member should be the executable. */ | |
836 | if ((lm = first_link_map_member ()) == 0) | |
837 | return 0; /* failed somehow... */ | |
838 | ||
839 | /* Read address of name from target memory to GDB. */ | |
840 | read_memory (lm + lmo->l_name_offset, l_name_buf, lmo->l_name_size); | |
841 | ||
842 | /* Convert the address to host format. */ | |
843 | l_name = extract_address (l_name_buf, lmo->l_name_size); | |
844 | ||
845 | /* Free l_name_buf. */ | |
846 | do_cleanups (cleanups); | |
847 | ||
848 | if (l_name == 0) | |
849 | return 0; /* No filename. */ | |
850 | ||
851 | /* Now fetch the filename from target memory. */ | |
852 | target_read_string (l_name, &filename, SO_NAME_MAX_PATH_SIZE - 1, &errcode); | |
853 | ||
854 | if (errcode) | |
855 | { | |
856 | warning ("failed to read exec filename from attached file: %s", | |
857 | safe_strerror (errcode)); | |
858 | return 0; | |
859 | } | |
860 | ||
b8c9b27d | 861 | make_cleanup (xfree, filename); |
13437d4b | 862 | /* Have a pathname: read the symbol file. */ |
1adeb98a | 863 | symbol_file_add_main (filename, from_tty); |
13437d4b KB |
864 | |
865 | return 1; | |
866 | } | |
867 | #else | |
868 | ||
869 | static int | |
21479ded | 870 | open_symbol_file_object (void *from_ttyp) |
13437d4b KB |
871 | { |
872 | return 1; | |
873 | } | |
874 | ||
875 | #endif /* SVR4_SHARED_LIBS */ | |
876 | ||
877 | ||
878 | /* LOCAL FUNCTION | |
879 | ||
880 | current_sos -- build a list of currently loaded shared objects | |
881 | ||
882 | SYNOPSIS | |
883 | ||
884 | struct so_list *current_sos () | |
885 | ||
886 | DESCRIPTION | |
887 | ||
888 | Build a list of `struct so_list' objects describing the shared | |
889 | objects currently loaded in the inferior. This list does not | |
890 | include an entry for the main executable file. | |
891 | ||
892 | Note that we only gather information directly available from the | |
893 | inferior --- we don't examine any of the shared library files | |
894 | themselves. The declaration of `struct so_list' says which fields | |
895 | we provide values for. */ | |
896 | ||
897 | static struct so_list * | |
898 | svr4_current_sos (void) | |
899 | { | |
900 | CORE_ADDR lm; | |
901 | struct so_list *head = 0; | |
902 | struct so_list **link_ptr = &head; | |
903 | ||
904 | /* Make sure we've looked up the inferior's dynamic linker's base | |
905 | structure. */ | |
906 | if (! debug_base) | |
907 | { | |
908 | debug_base = locate_base (); | |
909 | ||
910 | /* If we can't find the dynamic linker's base structure, this | |
911 | must not be a dynamically linked executable. Hmm. */ | |
912 | if (! debug_base) | |
913 | return 0; | |
914 | } | |
915 | ||
916 | /* Walk the inferior's link map list, and build our list of | |
917 | `struct so_list' nodes. */ | |
918 | lm = first_link_map_member (); | |
919 | while (lm) | |
920 | { | |
921 | struct link_map_offsets *lmo = SVR4_FETCH_LINK_MAP_OFFSETS (); | |
922 | struct so_list *new | |
923 | = (struct so_list *) xmalloc (sizeof (struct so_list)); | |
b8c9b27d | 924 | struct cleanup *old_chain = make_cleanup (xfree, new); |
13437d4b KB |
925 | |
926 | memset (new, 0, sizeof (*new)); | |
927 | ||
928 | new->lm_info = xmalloc (sizeof (struct lm_info)); | |
b8c9b27d | 929 | make_cleanup (xfree, new->lm_info); |
13437d4b KB |
930 | |
931 | new->lm_info->lm = xmalloc (lmo->link_map_size); | |
b8c9b27d | 932 | make_cleanup (xfree, new->lm_info->lm); |
13437d4b KB |
933 | memset (new->lm_info->lm, 0, lmo->link_map_size); |
934 | ||
935 | read_memory (lm, new->lm_info->lm, lmo->link_map_size); | |
936 | ||
937 | lm = LM_NEXT (new); | |
938 | ||
939 | /* For SVR4 versions, the first entry in the link map is for the | |
940 | inferior executable, so we must ignore it. For some versions of | |
941 | SVR4, it has no name. For others (Solaris 2.3 for example), it | |
942 | does have a name, so we can no longer use a missing name to | |
943 | decide when to ignore it. */ | |
944 | if (IGNORE_FIRST_LINK_MAP_ENTRY (new)) | |
945 | free_so (new); | |
946 | else | |
947 | { | |
948 | int errcode; | |
949 | char *buffer; | |
950 | ||
951 | /* Extract this shared object's name. */ | |
952 | target_read_string (LM_NAME (new), &buffer, | |
953 | SO_NAME_MAX_PATH_SIZE - 1, &errcode); | |
954 | if (errcode != 0) | |
955 | { | |
956 | warning ("current_sos: Can't read pathname for load map: %s\n", | |
957 | safe_strerror (errcode)); | |
958 | } | |
959 | else | |
960 | { | |
961 | strncpy (new->so_name, buffer, SO_NAME_MAX_PATH_SIZE - 1); | |
962 | new->so_name[SO_NAME_MAX_PATH_SIZE - 1] = '\0'; | |
b8c9b27d | 963 | xfree (buffer); |
13437d4b KB |
964 | strcpy (new->so_original_name, new->so_name); |
965 | } | |
966 | ||
967 | /* If this entry has no name, or its name matches the name | |
968 | for the main executable, don't include it in the list. */ | |
969 | if (! new->so_name[0] | |
970 | || match_main (new->so_name)) | |
971 | free_so (new); | |
972 | else | |
973 | { | |
974 | new->next = 0; | |
975 | *link_ptr = new; | |
976 | link_ptr = &new->next; | |
977 | } | |
978 | } | |
979 | ||
980 | discard_cleanups (old_chain); | |
981 | } | |
982 | ||
983 | return head; | |
984 | } | |
985 | ||
986 | ||
987 | /* On some systems, the only way to recognize the link map entry for | |
988 | the main executable file is by looking at its name. Return | |
989 | non-zero iff SONAME matches one of the known main executable names. */ | |
990 | ||
991 | static int | |
992 | match_main (char *soname) | |
993 | { | |
994 | char **mainp; | |
995 | ||
996 | for (mainp = main_name_list; *mainp != NULL; mainp++) | |
997 | { | |
998 | if (strcmp (soname, *mainp) == 0) | |
999 | return (1); | |
1000 | } | |
1001 | ||
1002 | return (0); | |
1003 | } | |
1004 | ||
1005 | ||
13437d4b KB |
1006 | /* Return 1 if PC lies in the dynamic symbol resolution code of the |
1007 | SVR4 run time loader. */ | |
d7fa2ae2 | 1008 | #ifdef SVR4_SHARED_LIBS |
13437d4b KB |
1009 | static CORE_ADDR interp_text_sect_low; |
1010 | static CORE_ADDR interp_text_sect_high; | |
1011 | static CORE_ADDR interp_plt_sect_low; | |
1012 | static CORE_ADDR interp_plt_sect_high; | |
1013 | ||
d7fa2ae2 KB |
1014 | static int |
1015 | svr4_in_dynsym_resolve_code (CORE_ADDR pc) | |
13437d4b KB |
1016 | { |
1017 | return ((pc >= interp_text_sect_low && pc < interp_text_sect_high) | |
1018 | || (pc >= interp_plt_sect_low && pc < interp_plt_sect_high) | |
1019 | || in_plt_section (pc, NULL)); | |
1020 | } | |
d7fa2ae2 KB |
1021 | #else /* !SVR4_SHARED_LIBS */ |
1022 | static int | |
1023 | svr4_in_dynsym_resolve_code (CORE_ADDR pc) | |
1024 | { | |
1025 | return 0; | |
1026 | } | |
1027 | #endif /* SVR4_SHARED_LIBS */ | |
13437d4b KB |
1028 | |
1029 | /* | |
1030 | ||
1031 | LOCAL FUNCTION | |
1032 | ||
1033 | disable_break -- remove the "mapping changed" breakpoint | |
1034 | ||
1035 | SYNOPSIS | |
1036 | ||
1037 | static int disable_break () | |
1038 | ||
1039 | DESCRIPTION | |
1040 | ||
1041 | Removes the breakpoint that gets hit when the dynamic linker | |
1042 | completes a mapping change. | |
1043 | ||
1044 | */ | |
1045 | ||
1046 | #ifndef SVR4_SHARED_LIBS | |
1047 | ||
1048 | static int | |
1049 | disable_break (void) | |
1050 | { | |
1051 | int status = 1; | |
1052 | ||
1053 | int in_debugger = 0; | |
1054 | ||
1055 | /* Read the debugger structure from the inferior to retrieve the | |
1056 | address of the breakpoint and the original contents of the | |
1057 | breakpoint address. Remove the breakpoint by writing the original | |
1058 | contents back. */ | |
1059 | ||
1060 | read_memory (debug_addr, (char *) &debug_copy, sizeof (debug_copy)); | |
1061 | ||
1062 | /* Set `in_debugger' to zero now. */ | |
1063 | ||
1064 | write_memory (flag_addr, (char *) &in_debugger, sizeof (in_debugger)); | |
1065 | ||
1066 | breakpoint_addr = SOLIB_EXTRACT_ADDRESS (debug_copy.ldd_bp_addr); | |
1067 | write_memory (breakpoint_addr, (char *) &debug_copy.ldd_bp_inst, | |
1068 | sizeof (debug_copy.ldd_bp_inst)); | |
1069 | ||
1070 | /* For the SVR4 version, we always know the breakpoint address. For the | |
1071 | SunOS version we don't know it until the above code is executed. | |
1072 | Grumble if we are stopped anywhere besides the breakpoint address. */ | |
1073 | ||
1074 | if (stop_pc != breakpoint_addr) | |
1075 | { | |
1076 | warning ("stopped at unknown breakpoint while handling shared libraries"); | |
1077 | } | |
1078 | ||
1079 | return (status); | |
1080 | } | |
1081 | ||
1082 | #endif /* #ifdef SVR4_SHARED_LIBS */ | |
1083 | ||
1084 | /* | |
1085 | ||
1086 | LOCAL FUNCTION | |
1087 | ||
1088 | enable_break -- arrange for dynamic linker to hit breakpoint | |
1089 | ||
1090 | SYNOPSIS | |
1091 | ||
1092 | int enable_break (void) | |
1093 | ||
1094 | DESCRIPTION | |
1095 | ||
1096 | Both the SunOS and the SVR4 dynamic linkers have, as part of their | |
1097 | debugger interface, support for arranging for the inferior to hit | |
1098 | a breakpoint after mapping in the shared libraries. This function | |
1099 | enables that breakpoint. | |
1100 | ||
1101 | For SunOS, there is a special flag location (in_debugger) which we | |
1102 | set to 1. When the dynamic linker sees this flag set, it will set | |
1103 | a breakpoint at a location known only to itself, after saving the | |
1104 | original contents of that place and the breakpoint address itself, | |
1105 | in it's own internal structures. When we resume the inferior, it | |
1106 | will eventually take a SIGTRAP when it runs into the breakpoint. | |
1107 | We handle this (in a different place) by restoring the contents of | |
1108 | the breakpointed location (which is only known after it stops), | |
1109 | chasing around to locate the shared libraries that have been | |
1110 | loaded, then resuming. | |
1111 | ||
1112 | For SVR4, the debugger interface structure contains a member (r_brk) | |
1113 | which is statically initialized at the time the shared library is | |
1114 | built, to the offset of a function (_r_debug_state) which is guaran- | |
1115 | teed to be called once before mapping in a library, and again when | |
1116 | the mapping is complete. At the time we are examining this member, | |
1117 | it contains only the unrelocated offset of the function, so we have | |
1118 | to do our own relocation. Later, when the dynamic linker actually | |
1119 | runs, it relocates r_brk to be the actual address of _r_debug_state(). | |
1120 | ||
1121 | The debugger interface structure also contains an enumeration which | |
1122 | is set to either RT_ADD or RT_DELETE prior to changing the mapping, | |
1123 | depending upon whether or not the library is being mapped or unmapped, | |
1124 | and then set to RT_CONSISTENT after the library is mapped/unmapped. | |
1125 | */ | |
1126 | ||
1127 | static int | |
1128 | enable_break (void) | |
1129 | { | |
1130 | int success = 0; | |
1131 | ||
1132 | #ifndef SVR4_SHARED_LIBS | |
1133 | ||
1134 | int j; | |
1135 | int in_debugger; | |
1136 | ||
1137 | /* Get link_dynamic structure */ | |
1138 | ||
1139 | j = target_read_memory (debug_base, (char *) &dynamic_copy, | |
1140 | sizeof (dynamic_copy)); | |
1141 | if (j) | |
1142 | { | |
1143 | /* unreadable */ | |
1144 | return (0); | |
1145 | } | |
1146 | ||
1147 | /* Calc address of debugger interface structure */ | |
1148 | ||
1149 | debug_addr = SOLIB_EXTRACT_ADDRESS (dynamic_copy.ldd); | |
1150 | ||
1151 | /* Calc address of `in_debugger' member of debugger interface structure */ | |
1152 | ||
1153 | flag_addr = debug_addr + (CORE_ADDR) ((char *) &debug_copy.ldd_in_debugger - | |
1154 | (char *) &debug_copy); | |
1155 | ||
1156 | /* Write a value of 1 to this member. */ | |
1157 | ||
1158 | in_debugger = 1; | |
1159 | write_memory (flag_addr, (char *) &in_debugger, sizeof (in_debugger)); | |
1160 | success = 1; | |
1161 | ||
1162 | #else /* SVR4_SHARED_LIBS */ | |
1163 | ||
1164 | #ifdef BKPT_AT_SYMBOL | |
1165 | ||
1166 | struct minimal_symbol *msymbol; | |
1167 | char **bkpt_namep; | |
1168 | asection *interp_sect; | |
1169 | ||
1170 | /* First, remove all the solib event breakpoints. Their addresses | |
1171 | may have changed since the last time we ran the program. */ | |
1172 | remove_solib_event_breakpoints (); | |
1173 | ||
1174 | #ifdef SVR4_SHARED_LIBS | |
1175 | interp_text_sect_low = interp_text_sect_high = 0; | |
1176 | interp_plt_sect_low = interp_plt_sect_high = 0; | |
1177 | ||
1178 | /* Find the .interp section; if not found, warn the user and drop | |
1179 | into the old breakpoint at symbol code. */ | |
1180 | interp_sect = bfd_get_section_by_name (exec_bfd, ".interp"); | |
1181 | if (interp_sect) | |
1182 | { | |
1183 | unsigned int interp_sect_size; | |
1184 | char *buf; | |
8ad2fcde KB |
1185 | CORE_ADDR load_addr = 0; |
1186 | int load_addr_found = 0; | |
1187 | struct so_list *inferior_sos; | |
e4f7b8c8 MS |
1188 | bfd *tmp_bfd = NULL; |
1189 | int tmp_fd = -1; | |
1190 | char *tmp_pathname = NULL; | |
13437d4b KB |
1191 | CORE_ADDR sym_addr = 0; |
1192 | ||
1193 | /* Read the contents of the .interp section into a local buffer; | |
1194 | the contents specify the dynamic linker this program uses. */ | |
1195 | interp_sect_size = bfd_section_size (exec_bfd, interp_sect); | |
1196 | buf = alloca (interp_sect_size); | |
1197 | bfd_get_section_contents (exec_bfd, interp_sect, | |
1198 | buf, 0, interp_sect_size); | |
1199 | ||
1200 | /* Now we need to figure out where the dynamic linker was | |
1201 | loaded so that we can load its symbols and place a breakpoint | |
1202 | in the dynamic linker itself. | |
1203 | ||
1204 | This address is stored on the stack. However, I've been unable | |
1205 | to find any magic formula to find it for Solaris (appears to | |
1206 | be trivial on GNU/Linux). Therefore, we have to try an alternate | |
1207 | mechanism to find the dynamic linker's base address. */ | |
e4f7b8c8 MS |
1208 | |
1209 | tmp_fd = solib_open (buf, &tmp_pathname); | |
1210 | if (tmp_fd >= 0) | |
1211 | tmp_bfd = bfd_fdopenr (tmp_pathname, gnutarget, tmp_fd); | |
1212 | ||
13437d4b KB |
1213 | if (tmp_bfd == NULL) |
1214 | goto bkpt_at_symbol; | |
1215 | ||
1216 | /* Make sure the dynamic linker's really a useful object. */ | |
1217 | if (!bfd_check_format (tmp_bfd, bfd_object)) | |
1218 | { | |
1219 | warning ("Unable to grok dynamic linker %s as an object file", buf); | |
1220 | bfd_close (tmp_bfd); | |
1221 | goto bkpt_at_symbol; | |
1222 | } | |
1223 | ||
8ad2fcde KB |
1224 | /* If the entry in _DYNAMIC for the dynamic linker has already |
1225 | been filled in, we can read its base address from there. */ | |
1226 | inferior_sos = svr4_current_sos (); | |
1227 | if (inferior_sos) | |
1228 | { | |
1229 | /* Connected to a running target. Update our shared library table. */ | |
1230 | solib_add (NULL, 0, NULL); | |
1231 | } | |
1232 | while (inferior_sos) | |
1233 | { | |
1234 | if (strcmp (buf, inferior_sos->so_original_name) == 0) | |
1235 | { | |
1236 | load_addr_found = 1; | |
1237 | load_addr = LM_ADDR (inferior_sos); | |
1238 | break; | |
1239 | } | |
1240 | inferior_sos = inferior_sos->next; | |
1241 | } | |
1242 | ||
1243 | /* Otherwise we find the dynamic linker's base address by examining | |
1244 | the current pc (which should point at the entry point for the | |
1245 | dynamic linker) and subtracting the offset of the entry point. */ | |
1246 | if (!load_addr_found) | |
1247 | load_addr = read_pc () - tmp_bfd->start_address; | |
13437d4b KB |
1248 | |
1249 | /* Record the relocated start and end address of the dynamic linker | |
d7fa2ae2 | 1250 | text and plt section for svr4_in_dynsym_resolve_code. */ |
13437d4b KB |
1251 | interp_sect = bfd_get_section_by_name (tmp_bfd, ".text"); |
1252 | if (interp_sect) | |
1253 | { | |
1254 | interp_text_sect_low = | |
1255 | bfd_section_vma (tmp_bfd, interp_sect) + load_addr; | |
1256 | interp_text_sect_high = | |
1257 | interp_text_sect_low + bfd_section_size (tmp_bfd, interp_sect); | |
1258 | } | |
1259 | interp_sect = bfd_get_section_by_name (tmp_bfd, ".plt"); | |
1260 | if (interp_sect) | |
1261 | { | |
1262 | interp_plt_sect_low = | |
1263 | bfd_section_vma (tmp_bfd, interp_sect) + load_addr; | |
1264 | interp_plt_sect_high = | |
1265 | interp_plt_sect_low + bfd_section_size (tmp_bfd, interp_sect); | |
1266 | } | |
1267 | ||
1268 | /* Now try to set a breakpoint in the dynamic linker. */ | |
1269 | for (bkpt_namep = solib_break_names; *bkpt_namep != NULL; bkpt_namep++) | |
1270 | { | |
1271 | sym_addr = bfd_lookup_symbol (tmp_bfd, *bkpt_namep); | |
1272 | if (sym_addr != 0) | |
1273 | break; | |
1274 | } | |
1275 | ||
1276 | /* We're done with the temporary bfd. */ | |
1277 | bfd_close (tmp_bfd); | |
1278 | ||
1279 | if (sym_addr != 0) | |
1280 | { | |
1281 | create_solib_event_breakpoint (load_addr + sym_addr); | |
1282 | return 1; | |
1283 | } | |
1284 | ||
1285 | /* For whatever reason we couldn't set a breakpoint in the dynamic | |
1286 | linker. Warn and drop into the old code. */ | |
1287 | bkpt_at_symbol: | |
1288 | warning ("Unable to find dynamic linker breakpoint function.\nGDB will be unable to debug shared library initializers\nand track explicitly loaded dynamic code."); | |
1289 | } | |
1290 | #endif | |
1291 | ||
1292 | /* Scan through the list of symbols, trying to look up the symbol and | |
1293 | set a breakpoint there. Terminate loop when we/if we succeed. */ | |
1294 | ||
1295 | breakpoint_addr = 0; | |
1296 | for (bkpt_namep = bkpt_names; *bkpt_namep != NULL; bkpt_namep++) | |
1297 | { | |
1298 | msymbol = lookup_minimal_symbol (*bkpt_namep, NULL, symfile_objfile); | |
1299 | if ((msymbol != NULL) && (SYMBOL_VALUE_ADDRESS (msymbol) != 0)) | |
1300 | { | |
1301 | create_solib_event_breakpoint (SYMBOL_VALUE_ADDRESS (msymbol)); | |
1302 | return 1; | |
1303 | } | |
1304 | } | |
1305 | ||
1306 | /* Nothing good happened. */ | |
1307 | success = 0; | |
1308 | ||
1309 | #endif /* BKPT_AT_SYMBOL */ | |
1310 | ||
1311 | #endif /* !SVR4_SHARED_LIBS */ | |
1312 | ||
1313 | return (success); | |
1314 | } | |
1315 | ||
1316 | /* | |
1317 | ||
1318 | LOCAL FUNCTION | |
1319 | ||
1320 | special_symbol_handling -- additional shared library symbol handling | |
1321 | ||
1322 | SYNOPSIS | |
1323 | ||
1324 | void special_symbol_handling () | |
1325 | ||
1326 | DESCRIPTION | |
1327 | ||
1328 | Once the symbols from a shared object have been loaded in the usual | |
1329 | way, we are called to do any system specific symbol handling that | |
1330 | is needed. | |
1331 | ||
1332 | For SunOS4, this consists of grunging around in the dynamic | |
1333 | linkers structures to find symbol definitions for "common" symbols | |
1334 | and adding them to the minimal symbol table for the runtime common | |
1335 | objfile. | |
1336 | ||
1337 | */ | |
1338 | ||
1339 | static void | |
1340 | svr4_special_symbol_handling (void) | |
1341 | { | |
1342 | #ifndef SVR4_SHARED_LIBS | |
1343 | int j; | |
1344 | ||
1345 | if (debug_addr == 0) | |
1346 | { | |
1347 | /* Get link_dynamic structure */ | |
1348 | ||
1349 | j = target_read_memory (debug_base, (char *) &dynamic_copy, | |
1350 | sizeof (dynamic_copy)); | |
1351 | if (j) | |
1352 | { | |
1353 | /* unreadable */ | |
1354 | return; | |
1355 | } | |
1356 | ||
1357 | /* Calc address of debugger interface structure */ | |
1358 | /* FIXME, this needs work for cross-debugging of core files | |
1359 | (byteorder, size, alignment, etc). */ | |
1360 | ||
1361 | debug_addr = SOLIB_EXTRACT_ADDRESS (dynamic_copy.ldd); | |
1362 | } | |
1363 | ||
1364 | /* Read the debugger structure from the inferior, just to make sure | |
1365 | we have a current copy. */ | |
1366 | ||
1367 | j = target_read_memory (debug_addr, (char *) &debug_copy, | |
1368 | sizeof (debug_copy)); | |
1369 | if (j) | |
1370 | return; /* unreadable */ | |
1371 | ||
1372 | /* Get common symbol definitions for the loaded object. */ | |
1373 | ||
1374 | if (debug_copy.ldd_cp) | |
1375 | { | |
1376 | solib_add_common_symbols (SOLIB_EXTRACT_ADDRESS (debug_copy.ldd_cp)); | |
1377 | } | |
1378 | ||
1379 | #endif /* !SVR4_SHARED_LIBS */ | |
1380 | } | |
1381 | ||
e2a44558 KB |
1382 | /* Relocate the main executable. This function should be called upon |
1383 | stopping the inferior process at the entry point to the program. | |
1384 | The entry point from BFD is compared to the PC and if they are | |
1385 | different, the main executable is relocated by the proper amount. | |
1386 | ||
1387 | As written it will only attempt to relocate executables which | |
1388 | lack interpreter sections. It seems likely that only dynamic | |
1389 | linker executables will get relocated, though it should work | |
1390 | properly for a position-independent static executable as well. */ | |
1391 | ||
1392 | static void | |
1393 | svr4_relocate_main_executable (void) | |
1394 | { | |
1395 | asection *interp_sect; | |
1396 | CORE_ADDR pc = read_pc (); | |
1397 | ||
1398 | /* Decide if the objfile needs to be relocated. As indicated above, | |
1399 | we will only be here when execution is stopped at the beginning | |
1400 | of the program. Relocation is necessary if the address at which | |
1401 | we are presently stopped differs from the start address stored in | |
1402 | the executable AND there's no interpreter section. The condition | |
1403 | regarding the interpreter section is very important because if | |
1404 | there *is* an interpreter section, execution will begin there | |
1405 | instead. When there is an interpreter section, the start address | |
1406 | is (presumably) used by the interpreter at some point to start | |
1407 | execution of the program. | |
1408 | ||
1409 | If there is an interpreter, it is normal for it to be set to an | |
1410 | arbitrary address at the outset. The job of finding it is | |
1411 | handled in enable_break(). | |
1412 | ||
1413 | So, to summarize, relocations are necessary when there is no | |
1414 | interpreter section and the start address obtained from the | |
1415 | executable is different from the address at which GDB is | |
1416 | currently stopped. | |
1417 | ||
1418 | [ The astute reader will note that we also test to make sure that | |
1419 | the executable in question has the DYNAMIC flag set. It is my | |
1420 | opinion that this test is unnecessary (undesirable even). It | |
1421 | was added to avoid inadvertent relocation of an executable | |
1422 | whose e_type member in the ELF header is not ET_DYN. There may | |
1423 | be a time in the future when it is desirable to do relocations | |
1424 | on other types of files as well in which case this condition | |
1425 | should either be removed or modified to accomodate the new file | |
1426 | type. (E.g, an ET_EXEC executable which has been built to be | |
1427 | position-independent could safely be relocated by the OS if | |
1428 | desired. It is true that this violates the ABI, but the ABI | |
1429 | has been known to be bent from time to time.) - Kevin, Nov 2000. ] | |
1430 | */ | |
1431 | ||
1432 | interp_sect = bfd_get_section_by_name (exec_bfd, ".interp"); | |
1433 | if (interp_sect == NULL | |
1434 | && (bfd_get_file_flags (exec_bfd) & DYNAMIC) != 0 | |
1435 | && bfd_get_start_address (exec_bfd) != pc) | |
1436 | { | |
1437 | struct cleanup *old_chain; | |
1438 | struct section_offsets *new_offsets; | |
1439 | int i, changed; | |
1440 | CORE_ADDR displacement; | |
1441 | ||
1442 | /* It is necessary to relocate the objfile. The amount to | |
1443 | relocate by is simply the address at which we are stopped | |
1444 | minus the starting address from the executable. | |
1445 | ||
1446 | We relocate all of the sections by the same amount. This | |
1447 | behavior is mandated by recent editions of the System V ABI. | |
1448 | According to the System V Application Binary Interface, | |
1449 | Edition 4.1, page 5-5: | |
1450 | ||
1451 | ... Though the system chooses virtual addresses for | |
1452 | individual processes, it maintains the segments' relative | |
1453 | positions. Because position-independent code uses relative | |
1454 | addressesing between segments, the difference between | |
1455 | virtual addresses in memory must match the difference | |
1456 | between virtual addresses in the file. The difference | |
1457 | between the virtual address of any segment in memory and | |
1458 | the corresponding virtual address in the file is thus a | |
1459 | single constant value for any one executable or shared | |
1460 | object in a given process. This difference is the base | |
1461 | address. One use of the base address is to relocate the | |
1462 | memory image of the program during dynamic linking. | |
1463 | ||
1464 | The same language also appears in Edition 4.0 of the System V | |
1465 | ABI and is left unspecified in some of the earlier editions. */ | |
1466 | ||
1467 | displacement = pc - bfd_get_start_address (exec_bfd); | |
1468 | changed = 0; | |
1469 | ||
1470 | new_offsets = xcalloc (sizeof (struct section_offsets), | |
1471 | symfile_objfile->num_sections); | |
b8c9b27d | 1472 | old_chain = make_cleanup (xfree, new_offsets); |
e2a44558 KB |
1473 | |
1474 | for (i = 0; i < symfile_objfile->num_sections; i++) | |
1475 | { | |
1476 | if (displacement != ANOFFSET (symfile_objfile->section_offsets, i)) | |
1477 | changed = 1; | |
1478 | new_offsets->offsets[i] = displacement; | |
1479 | } | |
1480 | ||
1481 | if (changed) | |
1482 | objfile_relocate (symfile_objfile, new_offsets); | |
1483 | ||
1484 | do_cleanups (old_chain); | |
1485 | } | |
1486 | } | |
1487 | ||
13437d4b KB |
1488 | /* |
1489 | ||
1490 | GLOBAL FUNCTION | |
1491 | ||
1492 | svr4_solib_create_inferior_hook -- shared library startup support | |
1493 | ||
1494 | SYNOPSIS | |
1495 | ||
1496 | void svr4_solib_create_inferior_hook() | |
1497 | ||
1498 | DESCRIPTION | |
1499 | ||
1500 | When gdb starts up the inferior, it nurses it along (through the | |
1501 | shell) until it is ready to execute it's first instruction. At this | |
1502 | point, this function gets called via expansion of the macro | |
1503 | SOLIB_CREATE_INFERIOR_HOOK. | |
1504 | ||
1505 | For SunOS executables, this first instruction is typically the | |
1506 | one at "_start", or a similar text label, regardless of whether | |
1507 | the executable is statically or dynamically linked. The runtime | |
1508 | startup code takes care of dynamically linking in any shared | |
1509 | libraries, once gdb allows the inferior to continue. | |
1510 | ||
1511 | For SVR4 executables, this first instruction is either the first | |
1512 | instruction in the dynamic linker (for dynamically linked | |
1513 | executables) or the instruction at "start" for statically linked | |
1514 | executables. For dynamically linked executables, the system | |
1515 | first exec's /lib/libc.so.N, which contains the dynamic linker, | |
1516 | and starts it running. The dynamic linker maps in any needed | |
1517 | shared libraries, maps in the actual user executable, and then | |
1518 | jumps to "start" in the user executable. | |
1519 | ||
1520 | For both SunOS shared libraries, and SVR4 shared libraries, we | |
1521 | can arrange to cooperate with the dynamic linker to discover the | |
1522 | names of shared libraries that are dynamically linked, and the | |
1523 | base addresses to which they are linked. | |
1524 | ||
1525 | This function is responsible for discovering those names and | |
1526 | addresses, and saving sufficient information about them to allow | |
1527 | their symbols to be read at a later time. | |
1528 | ||
1529 | FIXME | |
1530 | ||
1531 | Between enable_break() and disable_break(), this code does not | |
1532 | properly handle hitting breakpoints which the user might have | |
1533 | set in the startup code or in the dynamic linker itself. Proper | |
1534 | handling will probably have to wait until the implementation is | |
1535 | changed to use the "breakpoint handler function" method. | |
1536 | ||
1537 | Also, what if child has exit()ed? Must exit loop somehow. | |
1538 | */ | |
1539 | ||
e2a44558 | 1540 | static void |
13437d4b KB |
1541 | svr4_solib_create_inferior_hook (void) |
1542 | { | |
e2a44558 KB |
1543 | /* Relocate the main executable if necessary. */ |
1544 | svr4_relocate_main_executable (); | |
1545 | ||
13437d4b KB |
1546 | /* If we are using the BKPT_AT_SYMBOL code, then we don't need the base |
1547 | yet. In fact, in the case of a SunOS4 executable being run on | |
1548 | Solaris, we can't get it yet. current_sos will get it when it needs | |
1549 | it. */ | |
1550 | #if !(defined (SVR4_SHARED_LIBS) && defined (BKPT_AT_SYMBOL)) | |
1551 | if ((debug_base = locate_base ()) == 0) | |
1552 | { | |
1553 | /* Can't find the symbol or the executable is statically linked. */ | |
1554 | return; | |
1555 | } | |
1556 | #endif | |
1557 | ||
1558 | if (!enable_break ()) | |
1559 | { | |
1560 | warning ("shared library handler failed to enable breakpoint"); | |
1561 | return; | |
1562 | } | |
1563 | ||
1564 | #if !defined(SVR4_SHARED_LIBS) || defined(_SCO_DS) | |
1565 | /* SCO and SunOS need the loop below, other systems should be using the | |
1566 | special shared library breakpoints and the shared library breakpoint | |
1567 | service routine. | |
1568 | ||
1569 | Now run the target. It will eventually hit the breakpoint, at | |
1570 | which point all of the libraries will have been mapped in and we | |
1571 | can go groveling around in the dynamic linker structures to find | |
1572 | out what we need to know about them. */ | |
1573 | ||
1574 | clear_proceed_status (); | |
1575 | stop_soon_quietly = 1; | |
1576 | stop_signal = TARGET_SIGNAL_0; | |
1577 | do | |
1578 | { | |
39f77062 | 1579 | target_resume (pid_to_ptid (-1), 0, stop_signal); |
13437d4b KB |
1580 | wait_for_inferior (); |
1581 | } | |
1582 | while (stop_signal != TARGET_SIGNAL_TRAP); | |
1583 | stop_soon_quietly = 0; | |
1584 | ||
1585 | #if !defined(_SCO_DS) | |
1586 | /* We are now either at the "mapping complete" breakpoint (or somewhere | |
1587 | else, a condition we aren't prepared to deal with anyway), so adjust | |
1588 | the PC as necessary after a breakpoint, disable the breakpoint, and | |
1589 | add any shared libraries that were mapped in. */ | |
1590 | ||
1591 | if (DECR_PC_AFTER_BREAK) | |
1592 | { | |
1593 | stop_pc -= DECR_PC_AFTER_BREAK; | |
1594 | write_register (PC_REGNUM, stop_pc); | |
1595 | } | |
1596 | ||
1597 | if (!disable_break ()) | |
1598 | { | |
1599 | warning ("shared library handler failed to disable breakpoint"); | |
1600 | } | |
1601 | ||
1602 | if (auto_solib_add) | |
1603 | solib_add ((char *) 0, 0, (struct target_ops *) 0); | |
1604 | #endif /* ! _SCO_DS */ | |
1605 | #endif | |
1606 | } | |
1607 | ||
1608 | static void | |
1609 | svr4_clear_solib (void) | |
1610 | { | |
1611 | debug_base = 0; | |
1612 | } | |
1613 | ||
1614 | static void | |
1615 | svr4_free_so (struct so_list *so) | |
1616 | { | |
b8c9b27d KB |
1617 | xfree (so->lm_info->lm); |
1618 | xfree (so->lm_info); | |
13437d4b KB |
1619 | } |
1620 | ||
749499cb KB |
1621 | static void |
1622 | svr4_relocate_section_addresses (struct so_list *so, | |
1623 | struct section_table *sec) | |
1624 | { | |
1625 | sec->addr += LM_ADDR (so); | |
1626 | sec->endaddr += LM_ADDR (so); | |
1627 | } | |
1628 | ||
e5e2b9ff KB |
1629 | /* Fetch a link_map_offsets structure for native targets using struct |
1630 | definitions from link.h. See solib-legacy.c for the function | |
1631 | which does the actual work. | |
1632 | ||
1633 | Note: For non-native targets (i.e. cross-debugging situations), | |
1634 | a target specific fetch_link_map_offsets() function should be | |
1635 | defined and registered via set_solib_svr4_fetch_link_map_offsets(). */ | |
1636 | ||
1637 | static struct link_map_offsets * | |
1638 | legacy_fetch_link_map_offsets (void) | |
1639 | { | |
1640 | if (legacy_svr4_fetch_link_map_offsets_hook) | |
1641 | return legacy_svr4_fetch_link_map_offsets_hook (); | |
1642 | else | |
1643 | { | |
1644 | internal_error (__FILE__, __LINE__, | |
1645 | "legacy_fetch_link_map_offsets called without legacy " | |
1646 | "link_map support enabled."); | |
1647 | return 0; | |
1648 | } | |
1649 | } | |
1650 | ||
1651 | /* Fetch a link_map_offsets structure using the method registered in the | |
1652 | architecture vector. */ | |
1653 | ||
1654 | static struct link_map_offsets * | |
1655 | svr4_fetch_link_map_offsets (void) | |
1656 | { | |
1657 | struct link_map_offsets *(*flmo)(void) = | |
1658 | gdbarch_data (fetch_link_map_offsets_gdbarch_data); | |
1659 | ||
1660 | if (flmo == NULL) | |
1661 | { | |
1662 | internal_error (__FILE__, __LINE__, | |
1663 | "svr4_fetch_link_map_offsets: fetch_link_map_offsets " | |
1664 | "method not defined for this architecture."); | |
1665 | return 0; | |
1666 | } | |
1667 | else | |
1668 | return (flmo ()); | |
1669 | } | |
1670 | ||
1c4dcb57 | 1671 | /* set_solib_svr4_fetch_link_map_offsets() is intended to be called by |
e5e2b9ff KB |
1672 | a <arch>_gdbarch_init() function. It is used to establish an |
1673 | architecture specific link_map_offsets fetcher for the architecture | |
1674 | being defined. */ | |
1c4dcb57 | 1675 | |
21479ded | 1676 | void |
e5e2b9ff KB |
1677 | set_solib_svr4_fetch_link_map_offsets (struct gdbarch *gdbarch, |
1678 | struct link_map_offsets *(*flmo) (void)) | |
21479ded | 1679 | { |
e5e2b9ff | 1680 | set_gdbarch_data (gdbarch, fetch_link_map_offsets_gdbarch_data, flmo); |
21479ded KB |
1681 | } |
1682 | ||
e5e2b9ff KB |
1683 | /* Initialize the architecture specific link_map_offsets fetcher. |
1684 | This is called after <arch>_gdbarch_init() has set up its struct | |
1685 | gdbarch for the new architecture, so care must be taken to use the | |
1686 | value set by set_solib_svr4_fetch_link_map_offsets(), above. We | |
1687 | do, however, attempt to provide a reasonable alternative (for | |
1688 | native targets anyway) if the <arch>_gdbarch_init() fails to call | |
1689 | set_solib_svr4_fetch_link_map_offsets(). */ | |
1c4dcb57 | 1690 | |
e5e2b9ff KB |
1691 | static void * |
1692 | init_fetch_link_map_offsets (struct gdbarch *gdbarch) | |
21479ded | 1693 | { |
e5e2b9ff KB |
1694 | struct link_map_offsets *(*flmo) = |
1695 | gdbarch_data (fetch_link_map_offsets_gdbarch_data); | |
1c4dcb57 | 1696 | |
e5e2b9ff KB |
1697 | if (flmo == NULL) |
1698 | return legacy_fetch_link_map_offsets; | |
1699 | else | |
1700 | return flmo; | |
21479ded KB |
1701 | } |
1702 | ||
13437d4b KB |
1703 | static struct target_so_ops svr4_so_ops; |
1704 | ||
1705 | void | |
1706 | _initialize_svr4_solib (void) | |
1707 | { | |
e5e2b9ff KB |
1708 | fetch_link_map_offsets_gdbarch_data = |
1709 | register_gdbarch_data (init_fetch_link_map_offsets, 0); | |
21479ded | 1710 | |
749499cb | 1711 | svr4_so_ops.relocate_section_addresses = svr4_relocate_section_addresses; |
13437d4b KB |
1712 | svr4_so_ops.free_so = svr4_free_so; |
1713 | svr4_so_ops.clear_solib = svr4_clear_solib; | |
1714 | svr4_so_ops.solib_create_inferior_hook = svr4_solib_create_inferior_hook; | |
1715 | svr4_so_ops.special_symbol_handling = svr4_special_symbol_handling; | |
1716 | svr4_so_ops.current_sos = svr4_current_sos; | |
1717 | svr4_so_ops.open_symbol_file_object = open_symbol_file_object; | |
d7fa2ae2 | 1718 | svr4_so_ops.in_dynsym_resolve_code = svr4_in_dynsym_resolve_code; |
13437d4b KB |
1719 | |
1720 | /* FIXME: Don't do this here. *_gdbarch_init() should set so_ops. */ | |
1721 | current_target_so_ops = &svr4_so_ops; | |
1722 | } |