Commit | Line | Data |
---|---|---|
13437d4b | 1 | /* Handle SunOS and SVR4 shared libraries for GDB, the GNU Debugger. |
8e65ff28 | 2 | Copyright 1990, 91, 92, 93, 94, 95, 96, 98, 1999, 2000, 2001 |
13437d4b KB |
3 | Free Software Foundation, Inc. |
4 | ||
5 | This file is part of GDB. | |
6 | ||
7 | This program is free software; you can redistribute it and/or modify | |
8 | it under the terms of the GNU General Public License as published by | |
9 | the Free Software Foundation; either version 2 of the License, or | |
10 | (at your option) any later version. | |
11 | ||
12 | This program is distributed in the hope that it will be useful, | |
13 | but WITHOUT ANY WARRANTY; without even the implied warranty of | |
14 | MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the | |
15 | GNU General Public License for more details. | |
16 | ||
17 | You should have received a copy of the GNU General Public License | |
18 | along with this program; if not, write to the Free Software | |
19 | Foundation, Inc., 59 Temple Place - Suite 330, | |
20 | Boston, MA 02111-1307, USA. */ | |
21 | ||
22 | #define _SYSCALL32 /* for Sparc64 cross Sparc32 */ | |
23 | #include "defs.h" | |
24 | ||
25 | ||
26 | #include <sys/types.h> | |
27 | #include <signal.h> | |
28 | #include "gdb_string.h" | |
29 | #include <sys/param.h> | |
30 | #include <fcntl.h> | |
31 | ||
32 | #ifndef SVR4_SHARED_LIBS | |
33 | /* SunOS shared libs need the nlist structure. */ | |
34 | #include <a.out.h> | |
35 | #else | |
36 | #include "elf/external.h" | |
37 | #endif | |
38 | ||
39 | #ifdef HAVE_LINK_H | |
40 | #include <link.h> | |
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 | ||
60 | /* Link map info to include in an allocated so_list entry */ | |
61 | ||
62 | struct lm_info | |
63 | { | |
64 | /* Pointer to copy of link map from inferior. The type is char * | |
65 | rather than void *, so that we may use byte offsets to find the | |
66 | various fields without the need for a cast. */ | |
67 | char *lm; | |
68 | }; | |
69 | ||
70 | /* On SVR4 systems, a list of symbols in the dynamic linker where | |
71 | GDB can try to place a breakpoint to monitor shared library | |
72 | events. | |
73 | ||
74 | If none of these symbols are found, or other errors occur, then | |
75 | SVR4 systems will fall back to using a symbol as the "startup | |
76 | mapping complete" breakpoint address. */ | |
77 | ||
78 | #ifdef SVR4_SHARED_LIBS | |
79 | static char *solib_break_names[] = | |
80 | { | |
81 | "r_debug_state", | |
82 | "_r_debug_state", | |
83 | "_dl_debug_state", | |
84 | "rtld_db_dlactivity", | |
1f72e589 | 85 | "_rtld_debug_state", |
13437d4b KB |
86 | NULL |
87 | }; | |
88 | #endif | |
89 | ||
90 | #define BKPT_AT_SYMBOL 1 | |
91 | ||
92 | #if defined (BKPT_AT_SYMBOL) && defined (SVR4_SHARED_LIBS) | |
93 | static char *bkpt_names[] = | |
94 | { | |
95 | #ifdef SOLIB_BKPT_NAME | |
96 | SOLIB_BKPT_NAME, /* Prefer configured name if it exists. */ | |
97 | #endif | |
98 | "_start", | |
99 | "main", | |
100 | NULL | |
101 | }; | |
102 | #endif | |
103 | ||
104 | /* Symbols which are used to locate the base of the link map structures. */ | |
105 | ||
106 | #ifndef SVR4_SHARED_LIBS | |
107 | static char *debug_base_symbols[] = | |
108 | { | |
109 | "_DYNAMIC", | |
110 | "_DYNAMIC__MGC", | |
111 | NULL | |
112 | }; | |
113 | #endif | |
114 | ||
115 | static char *main_name_list[] = | |
116 | { | |
117 | "main_$main", | |
118 | NULL | |
119 | }; | |
120 | ||
121 | ||
122 | /* Fetch (and possibly build) an appropriate link_map_offsets structure | |
123 | for native targets using struct definitions from link.h. */ | |
124 | ||
125 | struct link_map_offsets * | |
126 | default_svr4_fetch_link_map_offsets (void) | |
127 | { | |
128 | #ifdef HAVE_LINK_H | |
129 | static struct link_map_offsets lmo; | |
130 | static struct link_map_offsets *lmp = 0; | |
131 | #if defined (HAVE_STRUCT_LINK_MAP32) | |
132 | static struct link_map_offsets lmo32; | |
133 | static struct link_map_offsets *lmp32 = 0; | |
134 | #endif | |
135 | ||
136 | #ifndef offsetof | |
137 | #define offsetof(TYPE, MEMBER) ((unsigned long) &((TYPE *)0)->MEMBER) | |
138 | #endif | |
139 | #define fieldsize(TYPE, MEMBER) (sizeof (((TYPE *)0)->MEMBER)) | |
140 | ||
141 | if (lmp == 0) | |
142 | { | |
143 | lmp = &lmo; | |
144 | ||
145 | #ifdef SVR4_SHARED_LIBS | |
146 | lmo.r_debug_size = sizeof (struct r_debug); | |
147 | ||
148 | lmo.r_map_offset = offsetof (struct r_debug, r_map); | |
149 | lmo.r_map_size = fieldsize (struct r_debug, r_map); | |
150 | ||
151 | lmo.link_map_size = sizeof (struct link_map); | |
152 | ||
153 | lmo.l_addr_offset = offsetof (struct link_map, l_addr); | |
154 | lmo.l_addr_size = fieldsize (struct link_map, l_addr); | |
155 | ||
156 | lmo.l_next_offset = offsetof (struct link_map, l_next); | |
157 | lmo.l_next_size = fieldsize (struct link_map, l_next); | |
158 | ||
159 | lmo.l_prev_offset = offsetof (struct link_map, l_prev); | |
160 | lmo.l_prev_size = fieldsize (struct link_map, l_prev); | |
161 | ||
162 | lmo.l_name_offset = offsetof (struct link_map, l_name); | |
163 | lmo.l_name_size = fieldsize (struct link_map, l_name); | |
164 | #else /* !SVR4_SHARED_LIBS */ | |
165 | lmo.link_map_size = sizeof (struct link_map); | |
166 | ||
167 | lmo.l_addr_offset = offsetof (struct link_map, lm_addr); | |
168 | lmo.l_addr_size = fieldsize (struct link_map, lm_addr); | |
169 | ||
170 | lmo.l_next_offset = offsetof (struct link_map, lm_next); | |
171 | lmo.l_next_size = fieldsize (struct link_map, lm_next); | |
172 | ||
173 | lmo.l_name_offset = offsetof (struct link_map, lm_name); | |
174 | lmo.l_name_size = fieldsize (struct link_map, lm_name); | |
175 | #endif /* SVR4_SHARED_LIBS */ | |
176 | } | |
177 | ||
178 | #if defined (HAVE_STRUCT_LINK_MAP32) | |
179 | if (lmp32 == 0) | |
180 | { | |
181 | lmp32 = &lmo32; | |
182 | ||
183 | lmo32.r_debug_size = sizeof (struct r_debug32); | |
184 | ||
185 | lmo32.r_map_offset = offsetof (struct r_debug32, r_map); | |
186 | lmo32.r_map_size = fieldsize (struct r_debug32, r_map); | |
187 | ||
188 | lmo32.link_map_size = sizeof (struct link_map32); | |
189 | ||
190 | lmo32.l_addr_offset = offsetof (struct link_map32, l_addr); | |
191 | lmo32.l_addr_size = fieldsize (struct link_map32, l_addr); | |
192 | ||
193 | lmo32.l_next_offset = offsetof (struct link_map32, l_next); | |
194 | lmo32.l_next_size = fieldsize (struct link_map32, l_next); | |
195 | ||
196 | lmo32.l_prev_offset = offsetof (struct link_map32, l_prev); | |
197 | lmo32.l_prev_size = fieldsize (struct link_map32, l_prev); | |
198 | ||
199 | lmo32.l_name_offset = offsetof (struct link_map32, l_name); | |
200 | lmo32.l_name_size = fieldsize (struct link_map32, l_name); | |
201 | } | |
202 | #endif /* defined (HAVE_STRUCT_LINK_MAP32) */ | |
203 | ||
204 | #if defined (HAVE_STRUCT_LINK_MAP32) | |
205 | if (bfd_get_arch_size (exec_bfd) == 32) | |
206 | return lmp32; | |
207 | else | |
208 | #endif | |
209 | return lmp; | |
210 | ||
211 | #else | |
212 | ||
8e65ff28 AC |
213 | internal_error (__FILE__, __LINE__, |
214 | "default_svr4_fetch_link_map_offsets called without HAVE_LINK_H defined."); | |
13437d4b KB |
215 | return 0; |
216 | ||
217 | #endif /* HAVE_LINK_H */ | |
218 | } | |
219 | ||
220 | /* Macro to extract an address from a solib structure. | |
221 | When GDB is configured for some 32-bit targets (e.g. Solaris 2.7 | |
222 | sparc), BFD is configured to handle 64-bit targets, so CORE_ADDR is | |
223 | 64 bits. We have to extract only the significant bits of addresses | |
224 | to get the right address when accessing the core file BFD. */ | |
225 | ||
226 | #define SOLIB_EXTRACT_ADDRESS(MEMBER) \ | |
227 | extract_address (&(MEMBER), sizeof (MEMBER)) | |
228 | ||
229 | /* local data declarations */ | |
230 | ||
231 | #ifndef SVR4_SHARED_LIBS | |
232 | ||
233 | /* NOTE: converted the macros LM_ADDR, LM_NEXT, LM_NAME and | |
234 | IGNORE_FIRST_LINK_MAP_ENTRY into functions (see below). | |
235 | MVS, June 2000 */ | |
236 | ||
237 | static struct link_dynamic dynamic_copy; | |
238 | static struct link_dynamic_2 ld_2_copy; | |
239 | static struct ld_debug debug_copy; | |
240 | static CORE_ADDR debug_addr; | |
241 | static CORE_ADDR flag_addr; | |
242 | ||
243 | #endif /* !SVR4_SHARED_LIBS */ | |
244 | ||
245 | /* link map access functions */ | |
246 | ||
247 | static CORE_ADDR | |
248 | LM_ADDR (struct so_list *so) | |
249 | { | |
250 | struct link_map_offsets *lmo = SVR4_FETCH_LINK_MAP_OFFSETS (); | |
251 | ||
58bc91c9 MH |
252 | return (CORE_ADDR) extract_signed_integer (so->lm_info->lm + lmo->l_addr_offset, |
253 | lmo->l_addr_size); | |
13437d4b KB |
254 | } |
255 | ||
256 | static CORE_ADDR | |
257 | LM_NEXT (struct so_list *so) | |
258 | { | |
259 | struct link_map_offsets *lmo = SVR4_FETCH_LINK_MAP_OFFSETS (); | |
260 | ||
261 | return extract_address (so->lm_info->lm + lmo->l_next_offset, lmo->l_next_size); | |
262 | } | |
263 | ||
264 | static CORE_ADDR | |
265 | LM_NAME (struct so_list *so) | |
266 | { | |
267 | struct link_map_offsets *lmo = SVR4_FETCH_LINK_MAP_OFFSETS (); | |
268 | ||
269 | return extract_address (so->lm_info->lm + lmo->l_name_offset, lmo->l_name_size); | |
270 | } | |
271 | ||
272 | #ifndef SVR4_SHARED_LIBS | |
273 | ||
274 | static int | |
275 | IGNORE_FIRST_LINK_MAP_ENTRY (struct so_list *so) | |
276 | { | |
277 | return 0; | |
278 | } | |
279 | ||
280 | #else /* SVR4_SHARED_LIBS */ | |
281 | ||
282 | static int | |
283 | IGNORE_FIRST_LINK_MAP_ENTRY (struct so_list *so) | |
284 | { | |
285 | struct link_map_offsets *lmo = SVR4_FETCH_LINK_MAP_OFFSETS (); | |
286 | ||
287 | return extract_address (so->lm_info->lm + lmo->l_prev_offset, | |
288 | lmo->l_prev_size) == 0; | |
289 | } | |
290 | ||
291 | #endif /* !SVR4_SHARED_LIBS */ | |
292 | ||
13437d4b KB |
293 | static CORE_ADDR debug_base; /* Base of dynamic linker structures */ |
294 | static CORE_ADDR breakpoint_addr; /* Address where end bkpt is set */ | |
295 | ||
296 | /* Local function prototypes */ | |
297 | ||
298 | static int match_main (char *); | |
299 | ||
13437d4b KB |
300 | #ifndef SVR4_SHARED_LIBS |
301 | ||
302 | /* Allocate the runtime common object file. */ | |
303 | ||
304 | static void | |
305 | allocate_rt_common_objfile (void) | |
306 | { | |
307 | struct objfile *objfile; | |
308 | struct objfile *last_one; | |
309 | ||
310 | objfile = (struct objfile *) xmalloc (sizeof (struct objfile)); | |
311 | memset (objfile, 0, sizeof (struct objfile)); | |
312 | objfile->md = NULL; | |
313 | obstack_specify_allocation (&objfile->psymbol_cache.cache, 0, 0, | |
b8c9b27d | 314 | xmalloc, xfree); |
13437d4b | 315 | obstack_specify_allocation (&objfile->psymbol_obstack, 0, 0, xmalloc, |
b8c9b27d | 316 | xfree); |
13437d4b | 317 | obstack_specify_allocation (&objfile->symbol_obstack, 0, 0, xmalloc, |
b8c9b27d | 318 | xfree); |
13437d4b | 319 | obstack_specify_allocation (&objfile->type_obstack, 0, 0, xmalloc, |
b8c9b27d | 320 | xfree); |
13437d4b KB |
321 | objfile->name = mstrsave (objfile->md, "rt_common"); |
322 | ||
323 | /* Add this file onto the tail of the linked list of other such files. */ | |
324 | ||
325 | objfile->next = NULL; | |
326 | if (object_files == NULL) | |
327 | object_files = objfile; | |
328 | else | |
329 | { | |
330 | for (last_one = object_files; | |
331 | last_one->next; | |
332 | last_one = last_one->next); | |
333 | last_one->next = objfile; | |
334 | } | |
335 | ||
336 | rt_common_objfile = objfile; | |
337 | } | |
338 | ||
339 | /* Read all dynamically loaded common symbol definitions from the inferior | |
340 | and put them into the minimal symbol table for the runtime common | |
341 | objfile. */ | |
342 | ||
343 | static void | |
344 | solib_add_common_symbols (CORE_ADDR rtc_symp) | |
345 | { | |
346 | struct rtc_symb inferior_rtc_symb; | |
347 | struct nlist inferior_rtc_nlist; | |
348 | int len; | |
349 | char *name; | |
350 | ||
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, | |
b8c9b27d | 357 | xmalloc, xfree); |
13437d4b KB |
358 | rt_common_objfile->minimal_symbol_count = 0; |
359 | rt_common_objfile->msymbols = NULL; | |
360 | } | |
361 | ||
362 | init_minimal_symbol_collection (); | |
363 | make_cleanup_discard_minimal_symbols (); | |
364 | ||
365 | while (rtc_symp) | |
366 | { | |
367 | read_memory (rtc_symp, | |
368 | (char *) &inferior_rtc_symb, | |
369 | sizeof (inferior_rtc_symb)); | |
370 | read_memory (SOLIB_EXTRACT_ADDRESS (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 | name = xmalloc (len); | |
381 | read_memory (SOLIB_EXTRACT_ADDRESS (inferior_rtc_nlist.n_un.n_name), | |
382 | name, len); | |
383 | ||
384 | /* Allocate the runtime common objfile if necessary. */ | |
385 | if (rt_common_objfile == NULL) | |
386 | allocate_rt_common_objfile (); | |
387 | ||
388 | prim_record_minimal_symbol (name, inferior_rtc_nlist.n_value, | |
389 | mst_bss, rt_common_objfile); | |
b8c9b27d | 390 | xfree (name); |
13437d4b KB |
391 | } |
392 | rtc_symp = SOLIB_EXTRACT_ADDRESS (inferior_rtc_symb.rtc_next); | |
393 | } | |
394 | ||
395 | /* Install any minimal symbols that have been collected as the current | |
396 | minimal symbols for the runtime common objfile. */ | |
397 | ||
398 | install_minimal_symbols (rt_common_objfile); | |
399 | } | |
400 | ||
401 | #endif /* SVR4_SHARED_LIBS */ | |
402 | ||
403 | ||
404 | #ifdef SVR4_SHARED_LIBS | |
405 | ||
406 | static CORE_ADDR bfd_lookup_symbol (bfd *, char *); | |
407 | ||
408 | /* | |
409 | ||
410 | LOCAL FUNCTION | |
411 | ||
412 | bfd_lookup_symbol -- lookup the value for a specific symbol | |
413 | ||
414 | SYNOPSIS | |
415 | ||
416 | CORE_ADDR bfd_lookup_symbol (bfd *abfd, char *symname) | |
417 | ||
418 | DESCRIPTION | |
419 | ||
420 | An expensive way to lookup the value of a single symbol for | |
421 | bfd's that are only temporary anyway. This is used by the | |
422 | shared library support to find the address of the debugger | |
423 | interface structures in the shared library. | |
424 | ||
425 | Note that 0 is specifically allowed as an error return (no | |
426 | such symbol). | |
427 | */ | |
428 | ||
429 | static CORE_ADDR | |
430 | bfd_lookup_symbol (bfd *abfd, char *symname) | |
431 | { | |
432 | unsigned int storage_needed; | |
433 | asymbol *sym; | |
434 | asymbol **symbol_table; | |
435 | unsigned int number_of_symbols; | |
436 | unsigned int i; | |
437 | struct cleanup *back_to; | |
438 | CORE_ADDR symaddr = 0; | |
439 | ||
440 | storage_needed = bfd_get_symtab_upper_bound (abfd); | |
441 | ||
442 | if (storage_needed > 0) | |
443 | { | |
444 | symbol_table = (asymbol **) xmalloc (storage_needed); | |
b8c9b27d | 445 | back_to = make_cleanup (xfree, (PTR) symbol_table); |
13437d4b KB |
446 | number_of_symbols = bfd_canonicalize_symtab (abfd, symbol_table); |
447 | ||
448 | for (i = 0; i < number_of_symbols; i++) | |
449 | { | |
450 | sym = *symbol_table++; | |
451 | if (STREQ (sym->name, symname)) | |
452 | { | |
453 | /* Bfd symbols are section relative. */ | |
454 | symaddr = sym->value + sym->section->vma; | |
455 | break; | |
456 | } | |
457 | } | |
458 | do_cleanups (back_to); | |
459 | } | |
460 | ||
461 | if (symaddr) | |
462 | return symaddr; | |
463 | ||
464 | /* On FreeBSD, the dynamic linker is stripped by default. So we'll | |
465 | have to check the dynamic string table too. */ | |
466 | ||
467 | storage_needed = bfd_get_dynamic_symtab_upper_bound (abfd); | |
468 | ||
469 | if (storage_needed > 0) | |
470 | { | |
471 | symbol_table = (asymbol **) xmalloc (storage_needed); | |
b8c9b27d | 472 | back_to = make_cleanup (xfree, (PTR) symbol_table); |
13437d4b KB |
473 | number_of_symbols = bfd_canonicalize_dynamic_symtab (abfd, symbol_table); |
474 | ||
475 | for (i = 0; i < number_of_symbols; i++) | |
476 | { | |
477 | sym = *symbol_table++; | |
478 | if (STREQ (sym->name, symname)) | |
479 | { | |
480 | /* Bfd symbols are section relative. */ | |
481 | symaddr = sym->value + sym->section->vma; | |
482 | break; | |
483 | } | |
484 | } | |
485 | do_cleanups (back_to); | |
486 | } | |
487 | ||
488 | return symaddr; | |
489 | } | |
490 | ||
491 | #ifdef HANDLE_SVR4_EXEC_EMULATORS | |
492 | ||
493 | /* | |
494 | Solaris BCP (the part of Solaris which allows it to run SunOS4 | |
495 | a.out files) throws in another wrinkle. Solaris does not fill | |
496 | in the usual a.out link map structures when running BCP programs, | |
497 | the only way to get at them is via groping around in the dynamic | |
498 | linker. | |
499 | The dynamic linker and it's structures are located in the shared | |
500 | C library, which gets run as the executable's "interpreter" by | |
501 | the kernel. | |
502 | ||
503 | Note that we can assume nothing about the process state at the time | |
504 | we need to find these structures. We may be stopped on the first | |
505 | instruction of the interpreter (C shared library), the first | |
506 | instruction of the executable itself, or somewhere else entirely | |
507 | (if we attached to the process for example). | |
508 | */ | |
509 | ||
510 | static char *debug_base_symbols[] = | |
511 | { | |
512 | "r_debug", /* Solaris 2.3 */ | |
513 | "_r_debug", /* Solaris 2.1, 2.2 */ | |
514 | NULL | |
515 | }; | |
516 | ||
517 | static int look_for_base (int, CORE_ADDR); | |
518 | ||
519 | /* | |
520 | ||
521 | LOCAL FUNCTION | |
522 | ||
523 | look_for_base -- examine file for each mapped address segment | |
524 | ||
525 | SYNOPSYS | |
526 | ||
527 | static int look_for_base (int fd, CORE_ADDR baseaddr) | |
528 | ||
529 | DESCRIPTION | |
530 | ||
531 | This function is passed to proc_iterate_over_mappings, which | |
532 | causes it to get called once for each mapped address space, with | |
533 | an open file descriptor for the file mapped to that space, and the | |
534 | base address of that mapped space. | |
535 | ||
536 | Our job is to find the debug base symbol in the file that this | |
537 | fd is open on, if it exists, and if so, initialize the dynamic | |
538 | linker structure base address debug_base. | |
539 | ||
540 | Note that this is a computationally expensive proposition, since | |
541 | we basically have to open a bfd on every call, so we specifically | |
542 | avoid opening the exec file. | |
543 | */ | |
544 | ||
545 | static int | |
546 | look_for_base (int fd, CORE_ADDR baseaddr) | |
547 | { | |
548 | bfd *interp_bfd; | |
549 | CORE_ADDR address = 0; | |
550 | char **symbolp; | |
551 | ||
552 | /* If the fd is -1, then there is no file that corresponds to this | |
553 | mapped memory segment, so skip it. Also, if the fd corresponds | |
554 | to the exec file, skip it as well. */ | |
555 | ||
556 | if (fd == -1 | |
557 | || (exec_bfd != NULL | |
558 | && fdmatch (fileno ((FILE *) (exec_bfd->iostream)), fd))) | |
559 | { | |
560 | return (0); | |
561 | } | |
562 | ||
563 | /* Try to open whatever random file this fd corresponds to. Note that | |
564 | we have no way currently to find the filename. Don't gripe about | |
565 | any problems we might have, just fail. */ | |
566 | ||
567 | if ((interp_bfd = bfd_fdopenr ("unnamed", gnutarget, fd)) == NULL) | |
568 | { | |
569 | return (0); | |
570 | } | |
571 | if (!bfd_check_format (interp_bfd, bfd_object)) | |
572 | { | |
573 | /* FIXME-leak: on failure, might not free all memory associated with | |
574 | interp_bfd. */ | |
575 | bfd_close (interp_bfd); | |
576 | return (0); | |
577 | } | |
578 | ||
579 | /* Now try to find our debug base symbol in this file, which we at | |
580 | least know to be a valid ELF executable or shared library. */ | |
581 | ||
582 | for (symbolp = debug_base_symbols; *symbolp != NULL; symbolp++) | |
583 | { | |
584 | address = bfd_lookup_symbol (interp_bfd, *symbolp); | |
585 | if (address != 0) | |
586 | { | |
587 | break; | |
588 | } | |
589 | } | |
590 | if (address == 0) | |
591 | { | |
592 | /* FIXME-leak: on failure, might not free all memory associated with | |
593 | interp_bfd. */ | |
594 | bfd_close (interp_bfd); | |
595 | return (0); | |
596 | } | |
597 | ||
598 | /* Eureka! We found the symbol. But now we may need to relocate it | |
599 | by the base address. If the symbol's value is less than the base | |
600 | address of the shared library, then it hasn't yet been relocated | |
601 | by the dynamic linker, and we have to do it ourself. FIXME: Note | |
602 | that we make the assumption that the first segment that corresponds | |
603 | to the shared library has the base address to which the library | |
604 | was relocated. */ | |
605 | ||
606 | if (address < baseaddr) | |
607 | { | |
608 | address += baseaddr; | |
609 | } | |
610 | debug_base = address; | |
611 | /* FIXME-leak: on failure, might not free all memory associated with | |
612 | interp_bfd. */ | |
613 | bfd_close (interp_bfd); | |
614 | return (1); | |
615 | } | |
616 | #endif /* HANDLE_SVR4_EXEC_EMULATORS */ | |
617 | ||
618 | /* | |
619 | ||
620 | LOCAL FUNCTION | |
621 | ||
622 | elf_locate_base -- locate the base address of dynamic linker structs | |
623 | for SVR4 elf targets. | |
624 | ||
625 | SYNOPSIS | |
626 | ||
627 | CORE_ADDR elf_locate_base (void) | |
628 | ||
629 | DESCRIPTION | |
630 | ||
631 | For SVR4 elf targets the address of the dynamic linker's runtime | |
632 | structure is contained within the dynamic info section in the | |
633 | executable file. The dynamic section is also mapped into the | |
634 | inferior address space. Because the runtime loader fills in the | |
635 | real address before starting the inferior, we have to read in the | |
636 | dynamic info section from the inferior address space. | |
637 | If there are any errors while trying to find the address, we | |
638 | silently return 0, otherwise the found address is returned. | |
639 | ||
640 | */ | |
641 | ||
642 | static CORE_ADDR | |
643 | elf_locate_base (void) | |
644 | { | |
645 | sec_ptr dyninfo_sect; | |
646 | int dyninfo_sect_size; | |
647 | CORE_ADDR dyninfo_addr; | |
648 | char *buf; | |
649 | char *bufend; | |
650 | int arch_size; | |
651 | ||
652 | /* Find the start address of the .dynamic section. */ | |
653 | dyninfo_sect = bfd_get_section_by_name (exec_bfd, ".dynamic"); | |
654 | if (dyninfo_sect == NULL) | |
655 | return 0; | |
656 | dyninfo_addr = bfd_section_vma (exec_bfd, dyninfo_sect); | |
657 | ||
658 | /* Read in .dynamic section, silently ignore errors. */ | |
659 | dyninfo_sect_size = bfd_section_size (exec_bfd, dyninfo_sect); | |
660 | buf = alloca (dyninfo_sect_size); | |
661 | if (target_read_memory (dyninfo_addr, buf, dyninfo_sect_size)) | |
662 | return 0; | |
663 | ||
664 | /* Find the DT_DEBUG entry in the the .dynamic section. | |
665 | For mips elf we look for DT_MIPS_RLD_MAP, mips elf apparently has | |
666 | no DT_DEBUG entries. */ | |
667 | ||
668 | arch_size = bfd_get_arch_size (exec_bfd); | |
669 | if (arch_size == -1) /* failure */ | |
670 | return 0; | |
671 | ||
672 | if (arch_size == 32) | |
673 | { /* 32-bit elf */ | |
674 | for (bufend = buf + dyninfo_sect_size; | |
675 | buf < bufend; | |
676 | buf += sizeof (Elf32_External_Dyn)) | |
677 | { | |
678 | Elf32_External_Dyn *x_dynp = (Elf32_External_Dyn *) buf; | |
679 | long dyn_tag; | |
680 | CORE_ADDR dyn_ptr; | |
681 | ||
682 | dyn_tag = bfd_h_get_32 (exec_bfd, (bfd_byte *) x_dynp->d_tag); | |
683 | if (dyn_tag == DT_NULL) | |
684 | break; | |
685 | else if (dyn_tag == DT_DEBUG) | |
686 | { | |
687 | dyn_ptr = bfd_h_get_32 (exec_bfd, | |
688 | (bfd_byte *) x_dynp->d_un.d_ptr); | |
689 | return dyn_ptr; | |
690 | } | |
691 | #ifdef DT_MIPS_RLD_MAP | |
692 | else if (dyn_tag == DT_MIPS_RLD_MAP) | |
693 | { | |
694 | char *pbuf; | |
695 | ||
696 | pbuf = alloca (TARGET_PTR_BIT / HOST_CHAR_BIT); | |
697 | /* DT_MIPS_RLD_MAP contains a pointer to the address | |
698 | of the dynamic link structure. */ | |
699 | dyn_ptr = bfd_h_get_32 (exec_bfd, | |
700 | (bfd_byte *) x_dynp->d_un.d_ptr); | |
701 | if (target_read_memory (dyn_ptr, pbuf, sizeof (pbuf))) | |
702 | return 0; | |
703 | return extract_unsigned_integer (pbuf, sizeof (pbuf)); | |
704 | } | |
705 | #endif | |
706 | } | |
707 | } | |
708 | else /* 64-bit elf */ | |
709 | { | |
710 | for (bufend = buf + dyninfo_sect_size; | |
711 | buf < bufend; | |
712 | buf += sizeof (Elf64_External_Dyn)) | |
713 | { | |
714 | Elf64_External_Dyn *x_dynp = (Elf64_External_Dyn *) buf; | |
715 | long dyn_tag; | |
716 | CORE_ADDR dyn_ptr; | |
717 | ||
718 | dyn_tag = bfd_h_get_64 (exec_bfd, (bfd_byte *) x_dynp->d_tag); | |
719 | if (dyn_tag == DT_NULL) | |
720 | break; | |
721 | else if (dyn_tag == DT_DEBUG) | |
722 | { | |
723 | dyn_ptr = bfd_h_get_64 (exec_bfd, | |
724 | (bfd_byte *) x_dynp->d_un.d_ptr); | |
725 | return dyn_ptr; | |
726 | } | |
727 | } | |
728 | } | |
729 | ||
730 | /* DT_DEBUG entry not found. */ | |
731 | return 0; | |
732 | } | |
733 | ||
734 | #endif /* SVR4_SHARED_LIBS */ | |
735 | ||
736 | /* | |
737 | ||
738 | LOCAL FUNCTION | |
739 | ||
740 | locate_base -- locate the base address of dynamic linker structs | |
741 | ||
742 | SYNOPSIS | |
743 | ||
744 | CORE_ADDR locate_base (void) | |
745 | ||
746 | DESCRIPTION | |
747 | ||
748 | For both the SunOS and SVR4 shared library implementations, if the | |
749 | inferior executable has been linked dynamically, there is a single | |
750 | address somewhere in the inferior's data space which is the key to | |
751 | locating all of the dynamic linker's runtime structures. This | |
752 | address is the value of the debug base symbol. The job of this | |
753 | function is to find and return that address, or to return 0 if there | |
754 | is no such address (the executable is statically linked for example). | |
755 | ||
756 | For SunOS, the job is almost trivial, since the dynamic linker and | |
757 | all of it's structures are statically linked to the executable at | |
758 | link time. Thus the symbol for the address we are looking for has | |
759 | already been added to the minimal symbol table for the executable's | |
760 | objfile at the time the symbol file's symbols were read, and all we | |
761 | have to do is look it up there. Note that we explicitly do NOT want | |
762 | to find the copies in the shared library. | |
763 | ||
764 | The SVR4 version is a bit more complicated because the address | |
765 | is contained somewhere in the dynamic info section. We have to go | |
766 | to a lot more work to discover the address of the debug base symbol. | |
767 | Because of this complexity, we cache the value we find and return that | |
768 | value on subsequent invocations. Note there is no copy in the | |
769 | executable symbol tables. | |
770 | ||
771 | */ | |
772 | ||
773 | static CORE_ADDR | |
774 | locate_base (void) | |
775 | { | |
776 | ||
777 | #ifndef SVR4_SHARED_LIBS | |
778 | ||
779 | struct minimal_symbol *msymbol; | |
780 | CORE_ADDR address = 0; | |
781 | char **symbolp; | |
782 | ||
783 | /* For SunOS, we want to limit the search for the debug base symbol to the | |
784 | executable being debugged, since there is a duplicate named symbol in the | |
785 | shared library. We don't want the shared library versions. */ | |
786 | ||
787 | for (symbolp = debug_base_symbols; *symbolp != NULL; symbolp++) | |
788 | { | |
789 | msymbol = lookup_minimal_symbol (*symbolp, NULL, symfile_objfile); | |
790 | if ((msymbol != NULL) && (SYMBOL_VALUE_ADDRESS (msymbol) != 0)) | |
791 | { | |
792 | address = SYMBOL_VALUE_ADDRESS (msymbol); | |
793 | return (address); | |
794 | } | |
795 | } | |
796 | return (0); | |
797 | ||
798 | #else /* SVR4_SHARED_LIBS */ | |
799 | ||
800 | /* Check to see if we have a currently valid address, and if so, avoid | |
801 | doing all this work again and just return the cached address. If | |
802 | we have no cached address, try to locate it in the dynamic info | |
803 | section for ELF executables. */ | |
804 | ||
805 | if (debug_base == 0) | |
806 | { | |
807 | if (exec_bfd != NULL | |
808 | && bfd_get_flavour (exec_bfd) == bfd_target_elf_flavour) | |
809 | debug_base = elf_locate_base (); | |
810 | #ifdef HANDLE_SVR4_EXEC_EMULATORS | |
811 | /* Try it the hard way for emulated executables. */ | |
812 | else if (inferior_pid != 0 && target_has_execution) | |
813 | proc_iterate_over_mappings (look_for_base); | |
814 | #endif | |
815 | } | |
816 | return (debug_base); | |
817 | ||
818 | #endif /* !SVR4_SHARED_LIBS */ | |
819 | ||
820 | } | |
821 | ||
822 | /* | |
823 | ||
824 | LOCAL FUNCTION | |
825 | ||
826 | first_link_map_member -- locate first member in dynamic linker's map | |
827 | ||
828 | SYNOPSIS | |
829 | ||
830 | static CORE_ADDR first_link_map_member (void) | |
831 | ||
832 | DESCRIPTION | |
833 | ||
834 | Find the first element in the inferior's dynamic link map, and | |
835 | return its address in the inferior. This function doesn't copy the | |
836 | link map entry itself into our address space; current_sos actually | |
837 | does the reading. */ | |
838 | ||
839 | static CORE_ADDR | |
840 | first_link_map_member (void) | |
841 | { | |
842 | CORE_ADDR lm = 0; | |
843 | ||
844 | #ifndef SVR4_SHARED_LIBS | |
845 | ||
846 | read_memory (debug_base, (char *) &dynamic_copy, sizeof (dynamic_copy)); | |
847 | if (dynamic_copy.ld_version >= 2) | |
848 | { | |
849 | /* It is a version that we can deal with, so read in the secondary | |
850 | structure and find the address of the link map list from it. */ | |
851 | read_memory (SOLIB_EXTRACT_ADDRESS (dynamic_copy.ld_un.ld_2), | |
852 | (char *) &ld_2_copy, sizeof (struct link_dynamic_2)); | |
853 | lm = SOLIB_EXTRACT_ADDRESS (ld_2_copy.ld_loaded); | |
854 | } | |
855 | ||
856 | #else /* SVR4_SHARED_LIBS */ | |
857 | struct link_map_offsets *lmo = SVR4_FETCH_LINK_MAP_OFFSETS (); | |
858 | char *r_map_buf = xmalloc (lmo->r_map_size); | |
b8c9b27d | 859 | struct cleanup *cleanups = make_cleanup (xfree, r_map_buf); |
13437d4b KB |
860 | |
861 | read_memory (debug_base + lmo->r_map_offset, r_map_buf, lmo->r_map_size); | |
862 | ||
863 | lm = extract_address (r_map_buf, lmo->r_map_size); | |
864 | ||
865 | /* FIXME: Perhaps we should validate the info somehow, perhaps by | |
866 | checking r_version for a known version number, or r_state for | |
867 | RT_CONSISTENT. */ | |
868 | ||
869 | do_cleanups (cleanups); | |
870 | ||
871 | #endif /* !SVR4_SHARED_LIBS */ | |
872 | ||
873 | return (lm); | |
874 | } | |
875 | ||
876 | #ifdef SVR4_SHARED_LIBS | |
877 | /* | |
878 | ||
879 | LOCAL FUNCTION | |
880 | ||
881 | open_symbol_file_object | |
882 | ||
883 | SYNOPSIS | |
884 | ||
885 | void open_symbol_file_object (void *from_tty) | |
886 | ||
887 | DESCRIPTION | |
888 | ||
889 | If no open symbol file, attempt to locate and open the main symbol | |
890 | file. On SVR4 systems, this is the first link map entry. If its | |
891 | name is here, we can open it. Useful when attaching to a process | |
892 | without first loading its symbol file. | |
893 | ||
894 | If FROM_TTYP dereferences to a non-zero integer, allow messages to | |
895 | be printed. This parameter is a pointer rather than an int because | |
896 | open_symbol_file_object() is called via catch_errors() and | |
897 | catch_errors() requires a pointer argument. */ | |
898 | ||
899 | static int | |
900 | open_symbol_file_object (void *from_ttyp) | |
901 | { | |
902 | CORE_ADDR lm, l_name; | |
903 | char *filename; | |
904 | int errcode; | |
905 | int from_tty = *(int *)from_ttyp; | |
906 | struct link_map_offsets *lmo = SVR4_FETCH_LINK_MAP_OFFSETS (); | |
907 | char *l_name_buf = xmalloc (lmo->l_name_size); | |
b8c9b27d | 908 | struct cleanup *cleanups = make_cleanup (xfree, l_name_buf); |
13437d4b KB |
909 | |
910 | if (symfile_objfile) | |
911 | if (!query ("Attempt to reload symbols from process? ")) | |
912 | return 0; | |
913 | ||
914 | if ((debug_base = locate_base ()) == 0) | |
915 | return 0; /* failed somehow... */ | |
916 | ||
917 | /* First link map member should be the executable. */ | |
918 | if ((lm = first_link_map_member ()) == 0) | |
919 | return 0; /* failed somehow... */ | |
920 | ||
921 | /* Read address of name from target memory to GDB. */ | |
922 | read_memory (lm + lmo->l_name_offset, l_name_buf, lmo->l_name_size); | |
923 | ||
924 | /* Convert the address to host format. */ | |
925 | l_name = extract_address (l_name_buf, lmo->l_name_size); | |
926 | ||
927 | /* Free l_name_buf. */ | |
928 | do_cleanups (cleanups); | |
929 | ||
930 | if (l_name == 0) | |
931 | return 0; /* No filename. */ | |
932 | ||
933 | /* Now fetch the filename from target memory. */ | |
934 | target_read_string (l_name, &filename, SO_NAME_MAX_PATH_SIZE - 1, &errcode); | |
935 | ||
936 | if (errcode) | |
937 | { | |
938 | warning ("failed to read exec filename from attached file: %s", | |
939 | safe_strerror (errcode)); | |
940 | return 0; | |
941 | } | |
942 | ||
b8c9b27d | 943 | make_cleanup (xfree, filename); |
13437d4b | 944 | /* Have a pathname: read the symbol file. */ |
1adeb98a | 945 | symbol_file_add_main (filename, from_tty); |
13437d4b KB |
946 | |
947 | return 1; | |
948 | } | |
949 | #else | |
950 | ||
951 | static int | |
952 | open_symbol_file_object (int *from_ttyp) | |
953 | { | |
954 | return 1; | |
955 | } | |
956 | ||
957 | #endif /* SVR4_SHARED_LIBS */ | |
958 | ||
959 | ||
960 | /* LOCAL FUNCTION | |
961 | ||
962 | current_sos -- build a list of currently loaded shared objects | |
963 | ||
964 | SYNOPSIS | |
965 | ||
966 | struct so_list *current_sos () | |
967 | ||
968 | DESCRIPTION | |
969 | ||
970 | Build a list of `struct so_list' objects describing the shared | |
971 | objects currently loaded in the inferior. This list does not | |
972 | include an entry for the main executable file. | |
973 | ||
974 | Note that we only gather information directly available from the | |
975 | inferior --- we don't examine any of the shared library files | |
976 | themselves. The declaration of `struct so_list' says which fields | |
977 | we provide values for. */ | |
978 | ||
979 | static struct so_list * | |
980 | svr4_current_sos (void) | |
981 | { | |
982 | CORE_ADDR lm; | |
983 | struct so_list *head = 0; | |
984 | struct so_list **link_ptr = &head; | |
985 | ||
986 | /* Make sure we've looked up the inferior's dynamic linker's base | |
987 | structure. */ | |
988 | if (! debug_base) | |
989 | { | |
990 | debug_base = locate_base (); | |
991 | ||
992 | /* If we can't find the dynamic linker's base structure, this | |
993 | must not be a dynamically linked executable. Hmm. */ | |
994 | if (! debug_base) | |
995 | return 0; | |
996 | } | |
997 | ||
998 | /* Walk the inferior's link map list, and build our list of | |
999 | `struct so_list' nodes. */ | |
1000 | lm = first_link_map_member (); | |
1001 | while (lm) | |
1002 | { | |
1003 | struct link_map_offsets *lmo = SVR4_FETCH_LINK_MAP_OFFSETS (); | |
1004 | struct so_list *new | |
1005 | = (struct so_list *) xmalloc (sizeof (struct so_list)); | |
b8c9b27d | 1006 | struct cleanup *old_chain = make_cleanup (xfree, new); |
13437d4b KB |
1007 | |
1008 | memset (new, 0, sizeof (*new)); | |
1009 | ||
1010 | new->lm_info = xmalloc (sizeof (struct lm_info)); | |
b8c9b27d | 1011 | make_cleanup (xfree, new->lm_info); |
13437d4b KB |
1012 | |
1013 | new->lm_info->lm = xmalloc (lmo->link_map_size); | |
b8c9b27d | 1014 | make_cleanup (xfree, new->lm_info->lm); |
13437d4b KB |
1015 | memset (new->lm_info->lm, 0, lmo->link_map_size); |
1016 | ||
1017 | read_memory (lm, new->lm_info->lm, lmo->link_map_size); | |
1018 | ||
1019 | lm = LM_NEXT (new); | |
1020 | ||
1021 | /* For SVR4 versions, the first entry in the link map is for the | |
1022 | inferior executable, so we must ignore it. For some versions of | |
1023 | SVR4, it has no name. For others (Solaris 2.3 for example), it | |
1024 | does have a name, so we can no longer use a missing name to | |
1025 | decide when to ignore it. */ | |
1026 | if (IGNORE_FIRST_LINK_MAP_ENTRY (new)) | |
1027 | free_so (new); | |
1028 | else | |
1029 | { | |
1030 | int errcode; | |
1031 | char *buffer; | |
1032 | ||
1033 | /* Extract this shared object's name. */ | |
1034 | target_read_string (LM_NAME (new), &buffer, | |
1035 | SO_NAME_MAX_PATH_SIZE - 1, &errcode); | |
1036 | if (errcode != 0) | |
1037 | { | |
1038 | warning ("current_sos: Can't read pathname for load map: %s\n", | |
1039 | safe_strerror (errcode)); | |
1040 | } | |
1041 | else | |
1042 | { | |
1043 | strncpy (new->so_name, buffer, SO_NAME_MAX_PATH_SIZE - 1); | |
1044 | new->so_name[SO_NAME_MAX_PATH_SIZE - 1] = '\0'; | |
b8c9b27d | 1045 | xfree (buffer); |
13437d4b KB |
1046 | strcpy (new->so_original_name, new->so_name); |
1047 | } | |
1048 | ||
1049 | /* If this entry has no name, or its name matches the name | |
1050 | for the main executable, don't include it in the list. */ | |
1051 | if (! new->so_name[0] | |
1052 | || match_main (new->so_name)) | |
1053 | free_so (new); | |
1054 | else | |
1055 | { | |
1056 | new->next = 0; | |
1057 | *link_ptr = new; | |
1058 | link_ptr = &new->next; | |
1059 | } | |
1060 | } | |
1061 | ||
1062 | discard_cleanups (old_chain); | |
1063 | } | |
1064 | ||
1065 | return head; | |
1066 | } | |
1067 | ||
1068 | ||
1069 | /* On some systems, the only way to recognize the link map entry for | |
1070 | the main executable file is by looking at its name. Return | |
1071 | non-zero iff SONAME matches one of the known main executable names. */ | |
1072 | ||
1073 | static int | |
1074 | match_main (char *soname) | |
1075 | { | |
1076 | char **mainp; | |
1077 | ||
1078 | for (mainp = main_name_list; *mainp != NULL; mainp++) | |
1079 | { | |
1080 | if (strcmp (soname, *mainp) == 0) | |
1081 | return (1); | |
1082 | } | |
1083 | ||
1084 | return (0); | |
1085 | } | |
1086 | ||
1087 | ||
1088 | #ifdef SVR4_SHARED_LIBS | |
1089 | ||
1090 | /* Return 1 if PC lies in the dynamic symbol resolution code of the | |
1091 | SVR4 run time loader. */ | |
1092 | ||
1093 | static CORE_ADDR interp_text_sect_low; | |
1094 | static CORE_ADDR interp_text_sect_high; | |
1095 | static CORE_ADDR interp_plt_sect_low; | |
1096 | static CORE_ADDR interp_plt_sect_high; | |
1097 | ||
1098 | int | |
1099 | in_svr4_dynsym_resolve_code (CORE_ADDR pc) | |
1100 | { | |
1101 | return ((pc >= interp_text_sect_low && pc < interp_text_sect_high) | |
1102 | || (pc >= interp_plt_sect_low && pc < interp_plt_sect_high) | |
1103 | || in_plt_section (pc, NULL)); | |
1104 | } | |
1105 | #endif | |
1106 | ||
1107 | /* | |
1108 | ||
1109 | LOCAL FUNCTION | |
1110 | ||
1111 | disable_break -- remove the "mapping changed" breakpoint | |
1112 | ||
1113 | SYNOPSIS | |
1114 | ||
1115 | static int disable_break () | |
1116 | ||
1117 | DESCRIPTION | |
1118 | ||
1119 | Removes the breakpoint that gets hit when the dynamic linker | |
1120 | completes a mapping change. | |
1121 | ||
1122 | */ | |
1123 | ||
1124 | #ifndef SVR4_SHARED_LIBS | |
1125 | ||
1126 | static int | |
1127 | disable_break (void) | |
1128 | { | |
1129 | int status = 1; | |
1130 | ||
1131 | int in_debugger = 0; | |
1132 | ||
1133 | /* Read the debugger structure from the inferior to retrieve the | |
1134 | address of the breakpoint and the original contents of the | |
1135 | breakpoint address. Remove the breakpoint by writing the original | |
1136 | contents back. */ | |
1137 | ||
1138 | read_memory (debug_addr, (char *) &debug_copy, sizeof (debug_copy)); | |
1139 | ||
1140 | /* Set `in_debugger' to zero now. */ | |
1141 | ||
1142 | write_memory (flag_addr, (char *) &in_debugger, sizeof (in_debugger)); | |
1143 | ||
1144 | breakpoint_addr = SOLIB_EXTRACT_ADDRESS (debug_copy.ldd_bp_addr); | |
1145 | write_memory (breakpoint_addr, (char *) &debug_copy.ldd_bp_inst, | |
1146 | sizeof (debug_copy.ldd_bp_inst)); | |
1147 | ||
1148 | /* For the SVR4 version, we always know the breakpoint address. For the | |
1149 | SunOS version we don't know it until the above code is executed. | |
1150 | Grumble if we are stopped anywhere besides the breakpoint address. */ | |
1151 | ||
1152 | if (stop_pc != breakpoint_addr) | |
1153 | { | |
1154 | warning ("stopped at unknown breakpoint while handling shared libraries"); | |
1155 | } | |
1156 | ||
1157 | return (status); | |
1158 | } | |
1159 | ||
1160 | #endif /* #ifdef SVR4_SHARED_LIBS */ | |
1161 | ||
1162 | /* | |
1163 | ||
1164 | LOCAL FUNCTION | |
1165 | ||
1166 | enable_break -- arrange for dynamic linker to hit breakpoint | |
1167 | ||
1168 | SYNOPSIS | |
1169 | ||
1170 | int enable_break (void) | |
1171 | ||
1172 | DESCRIPTION | |
1173 | ||
1174 | Both the SunOS and the SVR4 dynamic linkers have, as part of their | |
1175 | debugger interface, support for arranging for the inferior to hit | |
1176 | a breakpoint after mapping in the shared libraries. This function | |
1177 | enables that breakpoint. | |
1178 | ||
1179 | For SunOS, there is a special flag location (in_debugger) which we | |
1180 | set to 1. When the dynamic linker sees this flag set, it will set | |
1181 | a breakpoint at a location known only to itself, after saving the | |
1182 | original contents of that place and the breakpoint address itself, | |
1183 | in it's own internal structures. When we resume the inferior, it | |
1184 | will eventually take a SIGTRAP when it runs into the breakpoint. | |
1185 | We handle this (in a different place) by restoring the contents of | |
1186 | the breakpointed location (which is only known after it stops), | |
1187 | chasing around to locate the shared libraries that have been | |
1188 | loaded, then resuming. | |
1189 | ||
1190 | For SVR4, the debugger interface structure contains a member (r_brk) | |
1191 | which is statically initialized at the time the shared library is | |
1192 | built, to the offset of a function (_r_debug_state) which is guaran- | |
1193 | teed to be called once before mapping in a library, and again when | |
1194 | the mapping is complete. At the time we are examining this member, | |
1195 | it contains only the unrelocated offset of the function, so we have | |
1196 | to do our own relocation. Later, when the dynamic linker actually | |
1197 | runs, it relocates r_brk to be the actual address of _r_debug_state(). | |
1198 | ||
1199 | The debugger interface structure also contains an enumeration which | |
1200 | is set to either RT_ADD or RT_DELETE prior to changing the mapping, | |
1201 | depending upon whether or not the library is being mapped or unmapped, | |
1202 | and then set to RT_CONSISTENT after the library is mapped/unmapped. | |
1203 | */ | |
1204 | ||
1205 | static int | |
1206 | enable_break (void) | |
1207 | { | |
1208 | int success = 0; | |
1209 | ||
1210 | #ifndef SVR4_SHARED_LIBS | |
1211 | ||
1212 | int j; | |
1213 | int in_debugger; | |
1214 | ||
1215 | /* Get link_dynamic structure */ | |
1216 | ||
1217 | j = target_read_memory (debug_base, (char *) &dynamic_copy, | |
1218 | sizeof (dynamic_copy)); | |
1219 | if (j) | |
1220 | { | |
1221 | /* unreadable */ | |
1222 | return (0); | |
1223 | } | |
1224 | ||
1225 | /* Calc address of debugger interface structure */ | |
1226 | ||
1227 | debug_addr = SOLIB_EXTRACT_ADDRESS (dynamic_copy.ldd); | |
1228 | ||
1229 | /* Calc address of `in_debugger' member of debugger interface structure */ | |
1230 | ||
1231 | flag_addr = debug_addr + (CORE_ADDR) ((char *) &debug_copy.ldd_in_debugger - | |
1232 | (char *) &debug_copy); | |
1233 | ||
1234 | /* Write a value of 1 to this member. */ | |
1235 | ||
1236 | in_debugger = 1; | |
1237 | write_memory (flag_addr, (char *) &in_debugger, sizeof (in_debugger)); | |
1238 | success = 1; | |
1239 | ||
1240 | #else /* SVR4_SHARED_LIBS */ | |
1241 | ||
1242 | #ifdef BKPT_AT_SYMBOL | |
1243 | ||
1244 | struct minimal_symbol *msymbol; | |
1245 | char **bkpt_namep; | |
1246 | asection *interp_sect; | |
1247 | ||
1248 | /* First, remove all the solib event breakpoints. Their addresses | |
1249 | may have changed since the last time we ran the program. */ | |
1250 | remove_solib_event_breakpoints (); | |
1251 | ||
1252 | #ifdef SVR4_SHARED_LIBS | |
1253 | interp_text_sect_low = interp_text_sect_high = 0; | |
1254 | interp_plt_sect_low = interp_plt_sect_high = 0; | |
1255 | ||
1256 | /* Find the .interp section; if not found, warn the user and drop | |
1257 | into the old breakpoint at symbol code. */ | |
1258 | interp_sect = bfd_get_section_by_name (exec_bfd, ".interp"); | |
1259 | if (interp_sect) | |
1260 | { | |
1261 | unsigned int interp_sect_size; | |
1262 | char *buf; | |
1263 | CORE_ADDR load_addr; | |
e4f7b8c8 MS |
1264 | bfd *tmp_bfd = NULL; |
1265 | int tmp_fd = -1; | |
1266 | char *tmp_pathname = NULL; | |
13437d4b KB |
1267 | CORE_ADDR sym_addr = 0; |
1268 | ||
1269 | /* Read the contents of the .interp section into a local buffer; | |
1270 | the contents specify the dynamic linker this program uses. */ | |
1271 | interp_sect_size = bfd_section_size (exec_bfd, interp_sect); | |
1272 | buf = alloca (interp_sect_size); | |
1273 | bfd_get_section_contents (exec_bfd, interp_sect, | |
1274 | buf, 0, interp_sect_size); | |
1275 | ||
1276 | /* Now we need to figure out where the dynamic linker was | |
1277 | loaded so that we can load its symbols and place a breakpoint | |
1278 | in the dynamic linker itself. | |
1279 | ||
1280 | This address is stored on the stack. However, I've been unable | |
1281 | to find any magic formula to find it for Solaris (appears to | |
1282 | be trivial on GNU/Linux). Therefore, we have to try an alternate | |
1283 | mechanism to find the dynamic linker's base address. */ | |
e4f7b8c8 MS |
1284 | |
1285 | tmp_fd = solib_open (buf, &tmp_pathname); | |
1286 | if (tmp_fd >= 0) | |
1287 | tmp_bfd = bfd_fdopenr (tmp_pathname, gnutarget, tmp_fd); | |
1288 | ||
13437d4b KB |
1289 | if (tmp_bfd == NULL) |
1290 | goto bkpt_at_symbol; | |
1291 | ||
1292 | /* Make sure the dynamic linker's really a useful object. */ | |
1293 | if (!bfd_check_format (tmp_bfd, bfd_object)) | |
1294 | { | |
1295 | warning ("Unable to grok dynamic linker %s as an object file", buf); | |
1296 | bfd_close (tmp_bfd); | |
1297 | goto bkpt_at_symbol; | |
1298 | } | |
1299 | ||
1300 | /* We find the dynamic linker's base address by examining the | |
1301 | current pc (which point at the entry point for the dynamic | |
1302 | linker) and subtracting the offset of the entry point. */ | |
1303 | load_addr = read_pc () - tmp_bfd->start_address; | |
1304 | ||
1305 | /* Record the relocated start and end address of the dynamic linker | |
1306 | text and plt section for in_svr4_dynsym_resolve_code. */ | |
1307 | interp_sect = bfd_get_section_by_name (tmp_bfd, ".text"); | |
1308 | if (interp_sect) | |
1309 | { | |
1310 | interp_text_sect_low = | |
1311 | bfd_section_vma (tmp_bfd, interp_sect) + load_addr; | |
1312 | interp_text_sect_high = | |
1313 | interp_text_sect_low + bfd_section_size (tmp_bfd, interp_sect); | |
1314 | } | |
1315 | interp_sect = bfd_get_section_by_name (tmp_bfd, ".plt"); | |
1316 | if (interp_sect) | |
1317 | { | |
1318 | interp_plt_sect_low = | |
1319 | bfd_section_vma (tmp_bfd, interp_sect) + load_addr; | |
1320 | interp_plt_sect_high = | |
1321 | interp_plt_sect_low + bfd_section_size (tmp_bfd, interp_sect); | |
1322 | } | |
1323 | ||
1324 | /* Now try to set a breakpoint in the dynamic linker. */ | |
1325 | for (bkpt_namep = solib_break_names; *bkpt_namep != NULL; bkpt_namep++) | |
1326 | { | |
1327 | sym_addr = bfd_lookup_symbol (tmp_bfd, *bkpt_namep); | |
1328 | if (sym_addr != 0) | |
1329 | break; | |
1330 | } | |
1331 | ||
1332 | /* We're done with the temporary bfd. */ | |
1333 | bfd_close (tmp_bfd); | |
1334 | ||
1335 | if (sym_addr != 0) | |
1336 | { | |
1337 | create_solib_event_breakpoint (load_addr + sym_addr); | |
1338 | return 1; | |
1339 | } | |
1340 | ||
1341 | /* For whatever reason we couldn't set a breakpoint in the dynamic | |
1342 | linker. Warn and drop into the old code. */ | |
1343 | bkpt_at_symbol: | |
1344 | warning ("Unable to find dynamic linker breakpoint function.\nGDB will be unable to debug shared library initializers\nand track explicitly loaded dynamic code."); | |
1345 | } | |
1346 | #endif | |
1347 | ||
1348 | /* Scan through the list of symbols, trying to look up the symbol and | |
1349 | set a breakpoint there. Terminate loop when we/if we succeed. */ | |
1350 | ||
1351 | breakpoint_addr = 0; | |
1352 | for (bkpt_namep = bkpt_names; *bkpt_namep != NULL; bkpt_namep++) | |
1353 | { | |
1354 | msymbol = lookup_minimal_symbol (*bkpt_namep, NULL, symfile_objfile); | |
1355 | if ((msymbol != NULL) && (SYMBOL_VALUE_ADDRESS (msymbol) != 0)) | |
1356 | { | |
1357 | create_solib_event_breakpoint (SYMBOL_VALUE_ADDRESS (msymbol)); | |
1358 | return 1; | |
1359 | } | |
1360 | } | |
1361 | ||
1362 | /* Nothing good happened. */ | |
1363 | success = 0; | |
1364 | ||
1365 | #endif /* BKPT_AT_SYMBOL */ | |
1366 | ||
1367 | #endif /* !SVR4_SHARED_LIBS */ | |
1368 | ||
1369 | return (success); | |
1370 | } | |
1371 | ||
1372 | /* | |
1373 | ||
1374 | LOCAL FUNCTION | |
1375 | ||
1376 | special_symbol_handling -- additional shared library symbol handling | |
1377 | ||
1378 | SYNOPSIS | |
1379 | ||
1380 | void special_symbol_handling () | |
1381 | ||
1382 | DESCRIPTION | |
1383 | ||
1384 | Once the symbols from a shared object have been loaded in the usual | |
1385 | way, we are called to do any system specific symbol handling that | |
1386 | is needed. | |
1387 | ||
1388 | For SunOS4, this consists of grunging around in the dynamic | |
1389 | linkers structures to find symbol definitions for "common" symbols | |
1390 | and adding them to the minimal symbol table for the runtime common | |
1391 | objfile. | |
1392 | ||
1393 | */ | |
1394 | ||
1395 | static void | |
1396 | svr4_special_symbol_handling (void) | |
1397 | { | |
1398 | #ifndef SVR4_SHARED_LIBS | |
1399 | int j; | |
1400 | ||
1401 | if (debug_addr == 0) | |
1402 | { | |
1403 | /* Get link_dynamic structure */ | |
1404 | ||
1405 | j = target_read_memory (debug_base, (char *) &dynamic_copy, | |
1406 | sizeof (dynamic_copy)); | |
1407 | if (j) | |
1408 | { | |
1409 | /* unreadable */ | |
1410 | return; | |
1411 | } | |
1412 | ||
1413 | /* Calc address of debugger interface structure */ | |
1414 | /* FIXME, this needs work for cross-debugging of core files | |
1415 | (byteorder, size, alignment, etc). */ | |
1416 | ||
1417 | debug_addr = SOLIB_EXTRACT_ADDRESS (dynamic_copy.ldd); | |
1418 | } | |
1419 | ||
1420 | /* Read the debugger structure from the inferior, just to make sure | |
1421 | we have a current copy. */ | |
1422 | ||
1423 | j = target_read_memory (debug_addr, (char *) &debug_copy, | |
1424 | sizeof (debug_copy)); | |
1425 | if (j) | |
1426 | return; /* unreadable */ | |
1427 | ||
1428 | /* Get common symbol definitions for the loaded object. */ | |
1429 | ||
1430 | if (debug_copy.ldd_cp) | |
1431 | { | |
1432 | solib_add_common_symbols (SOLIB_EXTRACT_ADDRESS (debug_copy.ldd_cp)); | |
1433 | } | |
1434 | ||
1435 | #endif /* !SVR4_SHARED_LIBS */ | |
1436 | } | |
1437 | ||
e2a44558 KB |
1438 | /* Relocate the main executable. This function should be called upon |
1439 | stopping the inferior process at the entry point to the program. | |
1440 | The entry point from BFD is compared to the PC and if they are | |
1441 | different, the main executable is relocated by the proper amount. | |
1442 | ||
1443 | As written it will only attempt to relocate executables which | |
1444 | lack interpreter sections. It seems likely that only dynamic | |
1445 | linker executables will get relocated, though it should work | |
1446 | properly for a position-independent static executable as well. */ | |
1447 | ||
1448 | static void | |
1449 | svr4_relocate_main_executable (void) | |
1450 | { | |
1451 | asection *interp_sect; | |
1452 | CORE_ADDR pc = read_pc (); | |
1453 | ||
1454 | /* Decide if the objfile needs to be relocated. As indicated above, | |
1455 | we will only be here when execution is stopped at the beginning | |
1456 | of the program. Relocation is necessary if the address at which | |
1457 | we are presently stopped differs from the start address stored in | |
1458 | the executable AND there's no interpreter section. The condition | |
1459 | regarding the interpreter section is very important because if | |
1460 | there *is* an interpreter section, execution will begin there | |
1461 | instead. When there is an interpreter section, the start address | |
1462 | is (presumably) used by the interpreter at some point to start | |
1463 | execution of the program. | |
1464 | ||
1465 | If there is an interpreter, it is normal for it to be set to an | |
1466 | arbitrary address at the outset. The job of finding it is | |
1467 | handled in enable_break(). | |
1468 | ||
1469 | So, to summarize, relocations are necessary when there is no | |
1470 | interpreter section and the start address obtained from the | |
1471 | executable is different from the address at which GDB is | |
1472 | currently stopped. | |
1473 | ||
1474 | [ The astute reader will note that we also test to make sure that | |
1475 | the executable in question has the DYNAMIC flag set. It is my | |
1476 | opinion that this test is unnecessary (undesirable even). It | |
1477 | was added to avoid inadvertent relocation of an executable | |
1478 | whose e_type member in the ELF header is not ET_DYN. There may | |
1479 | be a time in the future when it is desirable to do relocations | |
1480 | on other types of files as well in which case this condition | |
1481 | should either be removed or modified to accomodate the new file | |
1482 | type. (E.g, an ET_EXEC executable which has been built to be | |
1483 | position-independent could safely be relocated by the OS if | |
1484 | desired. It is true that this violates the ABI, but the ABI | |
1485 | has been known to be bent from time to time.) - Kevin, Nov 2000. ] | |
1486 | */ | |
1487 | ||
1488 | interp_sect = bfd_get_section_by_name (exec_bfd, ".interp"); | |
1489 | if (interp_sect == NULL | |
1490 | && (bfd_get_file_flags (exec_bfd) & DYNAMIC) != 0 | |
1491 | && bfd_get_start_address (exec_bfd) != pc) | |
1492 | { | |
1493 | struct cleanup *old_chain; | |
1494 | struct section_offsets *new_offsets; | |
1495 | int i, changed; | |
1496 | CORE_ADDR displacement; | |
1497 | ||
1498 | /* It is necessary to relocate the objfile. The amount to | |
1499 | relocate by is simply the address at which we are stopped | |
1500 | minus the starting address from the executable. | |
1501 | ||
1502 | We relocate all of the sections by the same amount. This | |
1503 | behavior is mandated by recent editions of the System V ABI. | |
1504 | According to the System V Application Binary Interface, | |
1505 | Edition 4.1, page 5-5: | |
1506 | ||
1507 | ... Though the system chooses virtual addresses for | |
1508 | individual processes, it maintains the segments' relative | |
1509 | positions. Because position-independent code uses relative | |
1510 | addressesing between segments, the difference between | |
1511 | virtual addresses in memory must match the difference | |
1512 | between virtual addresses in the file. The difference | |
1513 | between the virtual address of any segment in memory and | |
1514 | the corresponding virtual address in the file is thus a | |
1515 | single constant value for any one executable or shared | |
1516 | object in a given process. This difference is the base | |
1517 | address. One use of the base address is to relocate the | |
1518 | memory image of the program during dynamic linking. | |
1519 | ||
1520 | The same language also appears in Edition 4.0 of the System V | |
1521 | ABI and is left unspecified in some of the earlier editions. */ | |
1522 | ||
1523 | displacement = pc - bfd_get_start_address (exec_bfd); | |
1524 | changed = 0; | |
1525 | ||
1526 | new_offsets = xcalloc (sizeof (struct section_offsets), | |
1527 | symfile_objfile->num_sections); | |
b8c9b27d | 1528 | old_chain = make_cleanup (xfree, new_offsets); |
e2a44558 KB |
1529 | |
1530 | for (i = 0; i < symfile_objfile->num_sections; i++) | |
1531 | { | |
1532 | if (displacement != ANOFFSET (symfile_objfile->section_offsets, i)) | |
1533 | changed = 1; | |
1534 | new_offsets->offsets[i] = displacement; | |
1535 | } | |
1536 | ||
1537 | if (changed) | |
1538 | objfile_relocate (symfile_objfile, new_offsets); | |
1539 | ||
1540 | do_cleanups (old_chain); | |
1541 | } | |
1542 | } | |
1543 | ||
13437d4b KB |
1544 | /* |
1545 | ||
1546 | GLOBAL FUNCTION | |
1547 | ||
1548 | svr4_solib_create_inferior_hook -- shared library startup support | |
1549 | ||
1550 | SYNOPSIS | |
1551 | ||
1552 | void svr4_solib_create_inferior_hook() | |
1553 | ||
1554 | DESCRIPTION | |
1555 | ||
1556 | When gdb starts up the inferior, it nurses it along (through the | |
1557 | shell) until it is ready to execute it's first instruction. At this | |
1558 | point, this function gets called via expansion of the macro | |
1559 | SOLIB_CREATE_INFERIOR_HOOK. | |
1560 | ||
1561 | For SunOS executables, this first instruction is typically the | |
1562 | one at "_start", or a similar text label, regardless of whether | |
1563 | the executable is statically or dynamically linked. The runtime | |
1564 | startup code takes care of dynamically linking in any shared | |
1565 | libraries, once gdb allows the inferior to continue. | |
1566 | ||
1567 | For SVR4 executables, this first instruction is either the first | |
1568 | instruction in the dynamic linker (for dynamically linked | |
1569 | executables) or the instruction at "start" for statically linked | |
1570 | executables. For dynamically linked executables, the system | |
1571 | first exec's /lib/libc.so.N, which contains the dynamic linker, | |
1572 | and starts it running. The dynamic linker maps in any needed | |
1573 | shared libraries, maps in the actual user executable, and then | |
1574 | jumps to "start" in the user executable. | |
1575 | ||
1576 | For both SunOS shared libraries, and SVR4 shared libraries, we | |
1577 | can arrange to cooperate with the dynamic linker to discover the | |
1578 | names of shared libraries that are dynamically linked, and the | |
1579 | base addresses to which they are linked. | |
1580 | ||
1581 | This function is responsible for discovering those names and | |
1582 | addresses, and saving sufficient information about them to allow | |
1583 | their symbols to be read at a later time. | |
1584 | ||
1585 | FIXME | |
1586 | ||
1587 | Between enable_break() and disable_break(), this code does not | |
1588 | properly handle hitting breakpoints which the user might have | |
1589 | set in the startup code or in the dynamic linker itself. Proper | |
1590 | handling will probably have to wait until the implementation is | |
1591 | changed to use the "breakpoint handler function" method. | |
1592 | ||
1593 | Also, what if child has exit()ed? Must exit loop somehow. | |
1594 | */ | |
1595 | ||
e2a44558 | 1596 | static void |
13437d4b KB |
1597 | svr4_solib_create_inferior_hook (void) |
1598 | { | |
e2a44558 KB |
1599 | /* Relocate the main executable if necessary. */ |
1600 | svr4_relocate_main_executable (); | |
1601 | ||
13437d4b KB |
1602 | /* If we are using the BKPT_AT_SYMBOL code, then we don't need the base |
1603 | yet. In fact, in the case of a SunOS4 executable being run on | |
1604 | Solaris, we can't get it yet. current_sos will get it when it needs | |
1605 | it. */ | |
1606 | #if !(defined (SVR4_SHARED_LIBS) && defined (BKPT_AT_SYMBOL)) | |
1607 | if ((debug_base = locate_base ()) == 0) | |
1608 | { | |
1609 | /* Can't find the symbol or the executable is statically linked. */ | |
1610 | return; | |
1611 | } | |
1612 | #endif | |
1613 | ||
1614 | if (!enable_break ()) | |
1615 | { | |
1616 | warning ("shared library handler failed to enable breakpoint"); | |
1617 | return; | |
1618 | } | |
1619 | ||
1620 | #if !defined(SVR4_SHARED_LIBS) || defined(_SCO_DS) | |
1621 | /* SCO and SunOS need the loop below, other systems should be using the | |
1622 | special shared library breakpoints and the shared library breakpoint | |
1623 | service routine. | |
1624 | ||
1625 | Now run the target. It will eventually hit the breakpoint, at | |
1626 | which point all of the libraries will have been mapped in and we | |
1627 | can go groveling around in the dynamic linker structures to find | |
1628 | out what we need to know about them. */ | |
1629 | ||
1630 | clear_proceed_status (); | |
1631 | stop_soon_quietly = 1; | |
1632 | stop_signal = TARGET_SIGNAL_0; | |
1633 | do | |
1634 | { | |
1635 | target_resume (-1, 0, stop_signal); | |
1636 | wait_for_inferior (); | |
1637 | } | |
1638 | while (stop_signal != TARGET_SIGNAL_TRAP); | |
1639 | stop_soon_quietly = 0; | |
1640 | ||
1641 | #if !defined(_SCO_DS) | |
1642 | /* We are now either at the "mapping complete" breakpoint (or somewhere | |
1643 | else, a condition we aren't prepared to deal with anyway), so adjust | |
1644 | the PC as necessary after a breakpoint, disable the breakpoint, and | |
1645 | add any shared libraries that were mapped in. */ | |
1646 | ||
1647 | if (DECR_PC_AFTER_BREAK) | |
1648 | { | |
1649 | stop_pc -= DECR_PC_AFTER_BREAK; | |
1650 | write_register (PC_REGNUM, stop_pc); | |
1651 | } | |
1652 | ||
1653 | if (!disable_break ()) | |
1654 | { | |
1655 | warning ("shared library handler failed to disable breakpoint"); | |
1656 | } | |
1657 | ||
1658 | if (auto_solib_add) | |
1659 | solib_add ((char *) 0, 0, (struct target_ops *) 0); | |
1660 | #endif /* ! _SCO_DS */ | |
1661 | #endif | |
1662 | } | |
1663 | ||
1664 | static void | |
1665 | svr4_clear_solib (void) | |
1666 | { | |
1667 | debug_base = 0; | |
1668 | } | |
1669 | ||
1670 | static void | |
1671 | svr4_free_so (struct so_list *so) | |
1672 | { | |
b8c9b27d KB |
1673 | xfree (so->lm_info->lm); |
1674 | xfree (so->lm_info); | |
13437d4b KB |
1675 | } |
1676 | ||
749499cb KB |
1677 | static void |
1678 | svr4_relocate_section_addresses (struct so_list *so, | |
1679 | struct section_table *sec) | |
1680 | { | |
1681 | sec->addr += LM_ADDR (so); | |
1682 | sec->endaddr += LM_ADDR (so); | |
1683 | } | |
1684 | ||
13437d4b KB |
1685 | static struct target_so_ops svr4_so_ops; |
1686 | ||
1687 | void | |
1688 | _initialize_svr4_solib (void) | |
1689 | { | |
749499cb | 1690 | svr4_so_ops.relocate_section_addresses = svr4_relocate_section_addresses; |
13437d4b KB |
1691 | svr4_so_ops.free_so = svr4_free_so; |
1692 | svr4_so_ops.clear_solib = svr4_clear_solib; | |
1693 | svr4_so_ops.solib_create_inferior_hook = svr4_solib_create_inferior_hook; | |
1694 | svr4_so_ops.special_symbol_handling = svr4_special_symbol_handling; | |
1695 | svr4_so_ops.current_sos = svr4_current_sos; | |
1696 | svr4_so_ops.open_symbol_file_object = open_symbol_file_object; | |
1697 | ||
1698 | /* FIXME: Don't do this here. *_gdbarch_init() should set so_ops. */ | |
1699 | current_target_so_ops = &svr4_so_ops; | |
1700 | } | |
1701 |