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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 KB |
60 | #ifndef SVR4_FETCH_LINK_MAP_OFFSETS |
61 | #define SVR4_FETCH_LINK_MAP_OFFSETS() fetch_link_map_offsets () | |
62 | #endif | |
63 | ||
64 | static struct link_map_offsets *default_svr4_fetch_link_map_offsets (void); | |
1c4dcb57 KB |
65 | |
66 | /* fetch_link_map_offsets is the pointer to the architecture specific | |
67 | link map offsets fetching function. It uses the gdbarch_swap | |
68 | mechanism to change its value when the architecture changes. */ | |
21479ded KB |
69 | static struct link_map_offsets *(*fetch_link_map_offsets)(void) = |
70 | default_svr4_fetch_link_map_offsets; | |
71 | ||
1c4dcb57 KB |
72 | /* fetch_link_map_offsets_init is like the above, but obtains its |
73 | value from a call to set_solib_svr4_fetch_link_map_offsets(). | |
74 | This latter function is intended to be called from a *_gdbarch_init() | |
75 | function. The value of ``fetch_link_map_offsets_init'' is used | |
76 | to actually set ``fetch_link_map_offsets'' when the architecture | |
77 | is installed. */ | |
78 | static struct link_map_offsets *(*fetch_link_map_offsets_init)(void) = 0; | |
79 | ||
21479ded KB |
80 | /* legacy_svr4_fetch_link_map_offsets_hook is a pointer to a function |
81 | which is used to fetch link map offsets. It will only be set | |
82 | by solib-legacy.c, if at all. */ | |
83 | struct link_map_offsets *(*legacy_svr4_fetch_link_map_offsets_hook)(void) = 0; | |
84 | ||
13437d4b KB |
85 | /* Link map info to include in an allocated so_list entry */ |
86 | ||
87 | struct lm_info | |
88 | { | |
89 | /* Pointer to copy of link map from inferior. The type is char * | |
90 | rather than void *, so that we may use byte offsets to find the | |
91 | various fields without the need for a cast. */ | |
92 | char *lm; | |
93 | }; | |
94 | ||
95 | /* On SVR4 systems, a list of symbols in the dynamic linker where | |
96 | GDB can try to place a breakpoint to monitor shared library | |
97 | events. | |
98 | ||
99 | If none of these symbols are found, or other errors occur, then | |
100 | SVR4 systems will fall back to using a symbol as the "startup | |
101 | mapping complete" breakpoint address. */ | |
102 | ||
103 | #ifdef SVR4_SHARED_LIBS | |
104 | static char *solib_break_names[] = | |
105 | { | |
106 | "r_debug_state", | |
107 | "_r_debug_state", | |
108 | "_dl_debug_state", | |
109 | "rtld_db_dlactivity", | |
1f72e589 | 110 | "_rtld_debug_state", |
13437d4b KB |
111 | NULL |
112 | }; | |
113 | #endif | |
114 | ||
115 | #define BKPT_AT_SYMBOL 1 | |
116 | ||
117 | #if defined (BKPT_AT_SYMBOL) && defined (SVR4_SHARED_LIBS) | |
118 | static char *bkpt_names[] = | |
119 | { | |
120 | #ifdef SOLIB_BKPT_NAME | |
121 | SOLIB_BKPT_NAME, /* Prefer configured name if it exists. */ | |
122 | #endif | |
123 | "_start", | |
124 | "main", | |
125 | NULL | |
126 | }; | |
127 | #endif | |
128 | ||
129 | /* Symbols which are used to locate the base of the link map structures. */ | |
130 | ||
131 | #ifndef SVR4_SHARED_LIBS | |
132 | static char *debug_base_symbols[] = | |
133 | { | |
134 | "_DYNAMIC", | |
135 | "_DYNAMIC__MGC", | |
136 | NULL | |
137 | }; | |
138 | #endif | |
139 | ||
140 | static char *main_name_list[] = | |
141 | { | |
142 | "main_$main", | |
143 | NULL | |
144 | }; | |
145 | ||
146 | ||
147 | /* Fetch (and possibly build) an appropriate link_map_offsets structure | |
21479ded KB |
148 | for native targets using struct definitions from link.h. |
149 | ||
150 | Note: For non-native targets (i.e. cross-debugging situations), | |
151 | you need to define a target specific fetch_link_map_offsets() | |
152 | function and call set_solib_svr4_fetch_link_map_offsets () to | |
153 | register this function. */ | |
13437d4b | 154 | |
21479ded | 155 | static struct link_map_offsets * |
13437d4b KB |
156 | default_svr4_fetch_link_map_offsets (void) |
157 | { | |
21479ded KB |
158 | if (legacy_svr4_fetch_link_map_offsets_hook) |
159 | return legacy_svr4_fetch_link_map_offsets_hook (); | |
160 | else | |
13437d4b | 161 | { |
21479ded KB |
162 | internal_error (__FILE__, __LINE__, |
163 | "default_svr4_fetch_link_map_offsets called without legacy link_map support enabled."); | |
164 | return 0; | |
13437d4b | 165 | } |
13437d4b KB |
166 | } |
167 | ||
168 | /* Macro to extract an address from a solib structure. | |
169 | When GDB is configured for some 32-bit targets (e.g. Solaris 2.7 | |
170 | sparc), BFD is configured to handle 64-bit targets, so CORE_ADDR is | |
171 | 64 bits. We have to extract only the significant bits of addresses | |
172 | to get the right address when accessing the core file BFD. */ | |
173 | ||
174 | #define SOLIB_EXTRACT_ADDRESS(MEMBER) \ | |
175 | extract_address (&(MEMBER), sizeof (MEMBER)) | |
176 | ||
177 | /* local data declarations */ | |
178 | ||
179 | #ifndef SVR4_SHARED_LIBS | |
180 | ||
181 | /* NOTE: converted the macros LM_ADDR, LM_NEXT, LM_NAME and | |
182 | IGNORE_FIRST_LINK_MAP_ENTRY into functions (see below). | |
183 | MVS, June 2000 */ | |
184 | ||
185 | static struct link_dynamic dynamic_copy; | |
186 | static struct link_dynamic_2 ld_2_copy; | |
187 | static struct ld_debug debug_copy; | |
188 | static CORE_ADDR debug_addr; | |
189 | static CORE_ADDR flag_addr; | |
190 | ||
191 | #endif /* !SVR4_SHARED_LIBS */ | |
192 | ||
193 | /* link map access functions */ | |
194 | ||
195 | static CORE_ADDR | |
196 | LM_ADDR (struct so_list *so) | |
197 | { | |
198 | struct link_map_offsets *lmo = SVR4_FETCH_LINK_MAP_OFFSETS (); | |
199 | ||
58bc91c9 MH |
200 | return (CORE_ADDR) extract_signed_integer (so->lm_info->lm + lmo->l_addr_offset, |
201 | lmo->l_addr_size); | |
13437d4b KB |
202 | } |
203 | ||
204 | static CORE_ADDR | |
205 | LM_NEXT (struct so_list *so) | |
206 | { | |
207 | struct link_map_offsets *lmo = SVR4_FETCH_LINK_MAP_OFFSETS (); | |
208 | ||
209 | return extract_address (so->lm_info->lm + lmo->l_next_offset, lmo->l_next_size); | |
210 | } | |
211 | ||
212 | static CORE_ADDR | |
213 | LM_NAME (struct so_list *so) | |
214 | { | |
215 | struct link_map_offsets *lmo = SVR4_FETCH_LINK_MAP_OFFSETS (); | |
216 | ||
217 | return extract_address (so->lm_info->lm + lmo->l_name_offset, lmo->l_name_size); | |
218 | } | |
219 | ||
220 | #ifndef SVR4_SHARED_LIBS | |
221 | ||
222 | static int | |
223 | IGNORE_FIRST_LINK_MAP_ENTRY (struct so_list *so) | |
224 | { | |
225 | return 0; | |
226 | } | |
227 | ||
228 | #else /* SVR4_SHARED_LIBS */ | |
229 | ||
230 | static int | |
231 | IGNORE_FIRST_LINK_MAP_ENTRY (struct so_list *so) | |
232 | { | |
233 | struct link_map_offsets *lmo = SVR4_FETCH_LINK_MAP_OFFSETS (); | |
234 | ||
235 | return extract_address (so->lm_info->lm + lmo->l_prev_offset, | |
236 | lmo->l_prev_size) == 0; | |
237 | } | |
238 | ||
239 | #endif /* !SVR4_SHARED_LIBS */ | |
240 | ||
13437d4b KB |
241 | static CORE_ADDR debug_base; /* Base of dynamic linker structures */ |
242 | static CORE_ADDR breakpoint_addr; /* Address where end bkpt is set */ | |
243 | ||
244 | /* Local function prototypes */ | |
245 | ||
246 | static int match_main (char *); | |
247 | ||
13437d4b KB |
248 | #ifndef SVR4_SHARED_LIBS |
249 | ||
250 | /* Allocate the runtime common object file. */ | |
251 | ||
252 | static void | |
253 | allocate_rt_common_objfile (void) | |
254 | { | |
255 | struct objfile *objfile; | |
256 | struct objfile *last_one; | |
257 | ||
258 | objfile = (struct objfile *) xmalloc (sizeof (struct objfile)); | |
259 | memset (objfile, 0, sizeof (struct objfile)); | |
260 | objfile->md = NULL; | |
261 | obstack_specify_allocation (&objfile->psymbol_cache.cache, 0, 0, | |
b8c9b27d | 262 | xmalloc, xfree); |
13437d4b | 263 | obstack_specify_allocation (&objfile->psymbol_obstack, 0, 0, xmalloc, |
b8c9b27d | 264 | xfree); |
13437d4b | 265 | obstack_specify_allocation (&objfile->symbol_obstack, 0, 0, xmalloc, |
b8c9b27d | 266 | xfree); |
13437d4b | 267 | obstack_specify_allocation (&objfile->type_obstack, 0, 0, xmalloc, |
b8c9b27d | 268 | xfree); |
13437d4b KB |
269 | objfile->name = mstrsave (objfile->md, "rt_common"); |
270 | ||
271 | /* Add this file onto the tail of the linked list of other such files. */ | |
272 | ||
273 | objfile->next = NULL; | |
274 | if (object_files == NULL) | |
275 | object_files = objfile; | |
276 | else | |
277 | { | |
278 | for (last_one = object_files; | |
279 | last_one->next; | |
280 | last_one = last_one->next); | |
281 | last_one->next = objfile; | |
282 | } | |
283 | ||
284 | rt_common_objfile = objfile; | |
285 | } | |
286 | ||
287 | /* Read all dynamically loaded common symbol definitions from the inferior | |
288 | and put them into the minimal symbol table for the runtime common | |
289 | objfile. */ | |
290 | ||
291 | static void | |
292 | solib_add_common_symbols (CORE_ADDR rtc_symp) | |
293 | { | |
294 | struct rtc_symb inferior_rtc_symb; | |
295 | struct nlist inferior_rtc_nlist; | |
296 | int len; | |
297 | char *name; | |
298 | ||
299 | /* Remove any runtime common symbols from previous runs. */ | |
300 | ||
301 | if (rt_common_objfile != NULL && rt_common_objfile->minimal_symbol_count) | |
302 | { | |
303 | obstack_free (&rt_common_objfile->symbol_obstack, 0); | |
304 | obstack_specify_allocation (&rt_common_objfile->symbol_obstack, 0, 0, | |
b8c9b27d | 305 | xmalloc, xfree); |
13437d4b KB |
306 | rt_common_objfile->minimal_symbol_count = 0; |
307 | rt_common_objfile->msymbols = NULL; | |
308 | } | |
309 | ||
310 | init_minimal_symbol_collection (); | |
311 | make_cleanup_discard_minimal_symbols (); | |
312 | ||
313 | while (rtc_symp) | |
314 | { | |
315 | read_memory (rtc_symp, | |
316 | (char *) &inferior_rtc_symb, | |
317 | sizeof (inferior_rtc_symb)); | |
318 | read_memory (SOLIB_EXTRACT_ADDRESS (inferior_rtc_symb.rtc_sp), | |
319 | (char *) &inferior_rtc_nlist, | |
320 | sizeof (inferior_rtc_nlist)); | |
321 | if (inferior_rtc_nlist.n_type == N_COMM) | |
322 | { | |
323 | /* FIXME: The length of the symbol name is not available, but in the | |
324 | current implementation the common symbol is allocated immediately | |
325 | behind the name of the symbol. */ | |
326 | len = inferior_rtc_nlist.n_value - inferior_rtc_nlist.n_un.n_strx; | |
327 | ||
328 | name = xmalloc (len); | |
329 | read_memory (SOLIB_EXTRACT_ADDRESS (inferior_rtc_nlist.n_un.n_name), | |
330 | name, len); | |
331 | ||
332 | /* Allocate the runtime common objfile if necessary. */ | |
333 | if (rt_common_objfile == NULL) | |
334 | allocate_rt_common_objfile (); | |
335 | ||
336 | prim_record_minimal_symbol (name, inferior_rtc_nlist.n_value, | |
337 | mst_bss, rt_common_objfile); | |
b8c9b27d | 338 | xfree (name); |
13437d4b KB |
339 | } |
340 | rtc_symp = SOLIB_EXTRACT_ADDRESS (inferior_rtc_symb.rtc_next); | |
341 | } | |
342 | ||
343 | /* Install any minimal symbols that have been collected as the current | |
344 | minimal symbols for the runtime common objfile. */ | |
345 | ||
346 | install_minimal_symbols (rt_common_objfile); | |
347 | } | |
348 | ||
349 | #endif /* SVR4_SHARED_LIBS */ | |
350 | ||
351 | ||
352 | #ifdef SVR4_SHARED_LIBS | |
353 | ||
354 | static CORE_ADDR bfd_lookup_symbol (bfd *, char *); | |
355 | ||
356 | /* | |
357 | ||
358 | LOCAL FUNCTION | |
359 | ||
360 | bfd_lookup_symbol -- lookup the value for a specific symbol | |
361 | ||
362 | SYNOPSIS | |
363 | ||
364 | CORE_ADDR bfd_lookup_symbol (bfd *abfd, char *symname) | |
365 | ||
366 | DESCRIPTION | |
367 | ||
368 | An expensive way to lookup the value of a single symbol for | |
369 | bfd's that are only temporary anyway. This is used by the | |
370 | shared library support to find the address of the debugger | |
371 | interface structures in the shared library. | |
372 | ||
373 | Note that 0 is specifically allowed as an error return (no | |
374 | such symbol). | |
375 | */ | |
376 | ||
377 | static CORE_ADDR | |
378 | bfd_lookup_symbol (bfd *abfd, char *symname) | |
379 | { | |
435b259c | 380 | long storage_needed; |
13437d4b KB |
381 | asymbol *sym; |
382 | asymbol **symbol_table; | |
383 | unsigned int number_of_symbols; | |
384 | unsigned int i; | |
385 | struct cleanup *back_to; | |
386 | CORE_ADDR symaddr = 0; | |
387 | ||
388 | storage_needed = bfd_get_symtab_upper_bound (abfd); | |
389 | ||
390 | if (storage_needed > 0) | |
391 | { | |
392 | symbol_table = (asymbol **) xmalloc (storage_needed); | |
b8c9b27d | 393 | back_to = make_cleanup (xfree, (PTR) symbol_table); |
13437d4b KB |
394 | number_of_symbols = bfd_canonicalize_symtab (abfd, symbol_table); |
395 | ||
396 | for (i = 0; i < number_of_symbols; i++) | |
397 | { | |
398 | sym = *symbol_table++; | |
399 | if (STREQ (sym->name, symname)) | |
400 | { | |
401 | /* Bfd symbols are section relative. */ | |
402 | symaddr = sym->value + sym->section->vma; | |
403 | break; | |
404 | } | |
405 | } | |
406 | do_cleanups (back_to); | |
407 | } | |
408 | ||
409 | if (symaddr) | |
410 | return symaddr; | |
411 | ||
412 | /* On FreeBSD, the dynamic linker is stripped by default. So we'll | |
413 | have to check the dynamic string table too. */ | |
414 | ||
415 | storage_needed = bfd_get_dynamic_symtab_upper_bound (abfd); | |
416 | ||
417 | if (storage_needed > 0) | |
418 | { | |
419 | symbol_table = (asymbol **) xmalloc (storage_needed); | |
b8c9b27d | 420 | back_to = make_cleanup (xfree, (PTR) symbol_table); |
13437d4b KB |
421 | number_of_symbols = bfd_canonicalize_dynamic_symtab (abfd, symbol_table); |
422 | ||
423 | for (i = 0; i < number_of_symbols; i++) | |
424 | { | |
425 | sym = *symbol_table++; | |
426 | if (STREQ (sym->name, symname)) | |
427 | { | |
428 | /* Bfd symbols are section relative. */ | |
429 | symaddr = sym->value + sym->section->vma; | |
430 | break; | |
431 | } | |
432 | } | |
433 | do_cleanups (back_to); | |
434 | } | |
435 | ||
436 | return symaddr; | |
437 | } | |
438 | ||
439 | #ifdef HANDLE_SVR4_EXEC_EMULATORS | |
440 | ||
441 | /* | |
442 | Solaris BCP (the part of Solaris which allows it to run SunOS4 | |
443 | a.out files) throws in another wrinkle. Solaris does not fill | |
444 | in the usual a.out link map structures when running BCP programs, | |
445 | the only way to get at them is via groping around in the dynamic | |
446 | linker. | |
447 | The dynamic linker and it's structures are located in the shared | |
448 | C library, which gets run as the executable's "interpreter" by | |
449 | the kernel. | |
450 | ||
451 | Note that we can assume nothing about the process state at the time | |
452 | we need to find these structures. We may be stopped on the first | |
453 | instruction of the interpreter (C shared library), the first | |
454 | instruction of the executable itself, or somewhere else entirely | |
455 | (if we attached to the process for example). | |
456 | */ | |
457 | ||
458 | static char *debug_base_symbols[] = | |
459 | { | |
460 | "r_debug", /* Solaris 2.3 */ | |
461 | "_r_debug", /* Solaris 2.1, 2.2 */ | |
462 | NULL | |
463 | }; | |
464 | ||
465 | static int look_for_base (int, CORE_ADDR); | |
466 | ||
467 | /* | |
468 | ||
469 | LOCAL FUNCTION | |
470 | ||
471 | look_for_base -- examine file for each mapped address segment | |
472 | ||
473 | SYNOPSYS | |
474 | ||
475 | static int look_for_base (int fd, CORE_ADDR baseaddr) | |
476 | ||
477 | DESCRIPTION | |
478 | ||
479 | This function is passed to proc_iterate_over_mappings, which | |
480 | causes it to get called once for each mapped address space, with | |
481 | an open file descriptor for the file mapped to that space, and the | |
482 | base address of that mapped space. | |
483 | ||
484 | Our job is to find the debug base symbol in the file that this | |
485 | fd is open on, if it exists, and if so, initialize the dynamic | |
486 | linker structure base address debug_base. | |
487 | ||
488 | Note that this is a computationally expensive proposition, since | |
489 | we basically have to open a bfd on every call, so we specifically | |
490 | avoid opening the exec file. | |
491 | */ | |
492 | ||
493 | static int | |
494 | look_for_base (int fd, CORE_ADDR baseaddr) | |
495 | { | |
496 | bfd *interp_bfd; | |
497 | CORE_ADDR address = 0; | |
498 | char **symbolp; | |
499 | ||
500 | /* If the fd is -1, then there is no file that corresponds to this | |
501 | mapped memory segment, so skip it. Also, if the fd corresponds | |
502 | to the exec file, skip it as well. */ | |
503 | ||
504 | if (fd == -1 | |
505 | || (exec_bfd != NULL | |
506 | && fdmatch (fileno ((FILE *) (exec_bfd->iostream)), fd))) | |
507 | { | |
508 | return (0); | |
509 | } | |
510 | ||
511 | /* Try to open whatever random file this fd corresponds to. Note that | |
512 | we have no way currently to find the filename. Don't gripe about | |
513 | any problems we might have, just fail. */ | |
514 | ||
515 | if ((interp_bfd = bfd_fdopenr ("unnamed", gnutarget, fd)) == NULL) | |
516 | { | |
517 | return (0); | |
518 | } | |
519 | if (!bfd_check_format (interp_bfd, bfd_object)) | |
520 | { | |
521 | /* FIXME-leak: on failure, might not free all memory associated with | |
522 | interp_bfd. */ | |
523 | bfd_close (interp_bfd); | |
524 | return (0); | |
525 | } | |
526 | ||
527 | /* Now try to find our debug base symbol in this file, which we at | |
528 | least know to be a valid ELF executable or shared library. */ | |
529 | ||
530 | for (symbolp = debug_base_symbols; *symbolp != NULL; symbolp++) | |
531 | { | |
532 | address = bfd_lookup_symbol (interp_bfd, *symbolp); | |
533 | if (address != 0) | |
534 | { | |
535 | break; | |
536 | } | |
537 | } | |
538 | if (address == 0) | |
539 | { | |
540 | /* FIXME-leak: on failure, might not free all memory associated with | |
541 | interp_bfd. */ | |
542 | bfd_close (interp_bfd); | |
543 | return (0); | |
544 | } | |
545 | ||
546 | /* Eureka! We found the symbol. But now we may need to relocate it | |
547 | by the base address. If the symbol's value is less than the base | |
548 | address of the shared library, then it hasn't yet been relocated | |
549 | by the dynamic linker, and we have to do it ourself. FIXME: Note | |
550 | that we make the assumption that the first segment that corresponds | |
551 | to the shared library has the base address to which the library | |
552 | was relocated. */ | |
553 | ||
554 | if (address < baseaddr) | |
555 | { | |
556 | address += baseaddr; | |
557 | } | |
558 | debug_base = address; | |
559 | /* FIXME-leak: on failure, might not free all memory associated with | |
560 | interp_bfd. */ | |
561 | bfd_close (interp_bfd); | |
562 | return (1); | |
563 | } | |
564 | #endif /* HANDLE_SVR4_EXEC_EMULATORS */ | |
565 | ||
566 | /* | |
567 | ||
568 | LOCAL FUNCTION | |
569 | ||
570 | elf_locate_base -- locate the base address of dynamic linker structs | |
571 | for SVR4 elf targets. | |
572 | ||
573 | SYNOPSIS | |
574 | ||
575 | CORE_ADDR elf_locate_base (void) | |
576 | ||
577 | DESCRIPTION | |
578 | ||
579 | For SVR4 elf targets the address of the dynamic linker's runtime | |
580 | structure is contained within the dynamic info section in the | |
581 | executable file. The dynamic section is also mapped into the | |
582 | inferior address space. Because the runtime loader fills in the | |
583 | real address before starting the inferior, we have to read in the | |
584 | dynamic info section from the inferior address space. | |
585 | If there are any errors while trying to find the address, we | |
586 | silently return 0, otherwise the found address is returned. | |
587 | ||
588 | */ | |
589 | ||
590 | static CORE_ADDR | |
591 | elf_locate_base (void) | |
592 | { | |
593 | sec_ptr dyninfo_sect; | |
594 | int dyninfo_sect_size; | |
595 | CORE_ADDR dyninfo_addr; | |
596 | char *buf; | |
597 | char *bufend; | |
598 | int arch_size; | |
599 | ||
600 | /* Find the start address of the .dynamic section. */ | |
601 | dyninfo_sect = bfd_get_section_by_name (exec_bfd, ".dynamic"); | |
602 | if (dyninfo_sect == NULL) | |
603 | return 0; | |
604 | dyninfo_addr = bfd_section_vma (exec_bfd, dyninfo_sect); | |
605 | ||
606 | /* Read in .dynamic section, silently ignore errors. */ | |
607 | dyninfo_sect_size = bfd_section_size (exec_bfd, dyninfo_sect); | |
608 | buf = alloca (dyninfo_sect_size); | |
609 | if (target_read_memory (dyninfo_addr, buf, dyninfo_sect_size)) | |
610 | return 0; | |
611 | ||
612 | /* Find the DT_DEBUG entry in the the .dynamic section. | |
613 | For mips elf we look for DT_MIPS_RLD_MAP, mips elf apparently has | |
614 | no DT_DEBUG entries. */ | |
615 | ||
616 | arch_size = bfd_get_arch_size (exec_bfd); | |
617 | if (arch_size == -1) /* failure */ | |
618 | return 0; | |
619 | ||
620 | if (arch_size == 32) | |
621 | { /* 32-bit elf */ | |
622 | for (bufend = buf + dyninfo_sect_size; | |
623 | buf < bufend; | |
624 | buf += sizeof (Elf32_External_Dyn)) | |
625 | { | |
626 | Elf32_External_Dyn *x_dynp = (Elf32_External_Dyn *) buf; | |
627 | long dyn_tag; | |
628 | CORE_ADDR dyn_ptr; | |
629 | ||
630 | dyn_tag = bfd_h_get_32 (exec_bfd, (bfd_byte *) x_dynp->d_tag); | |
631 | if (dyn_tag == DT_NULL) | |
632 | break; | |
633 | else if (dyn_tag == DT_DEBUG) | |
634 | { | |
635 | dyn_ptr = bfd_h_get_32 (exec_bfd, | |
636 | (bfd_byte *) x_dynp->d_un.d_ptr); | |
637 | return dyn_ptr; | |
638 | } | |
13437d4b KB |
639 | else if (dyn_tag == DT_MIPS_RLD_MAP) |
640 | { | |
641 | char *pbuf; | |
642 | ||
643 | pbuf = alloca (TARGET_PTR_BIT / HOST_CHAR_BIT); | |
644 | /* DT_MIPS_RLD_MAP contains a pointer to the address | |
645 | of the dynamic link structure. */ | |
646 | dyn_ptr = bfd_h_get_32 (exec_bfd, | |
647 | (bfd_byte *) x_dynp->d_un.d_ptr); | |
648 | if (target_read_memory (dyn_ptr, pbuf, sizeof (pbuf))) | |
649 | return 0; | |
650 | return extract_unsigned_integer (pbuf, sizeof (pbuf)); | |
651 | } | |
13437d4b KB |
652 | } |
653 | } | |
654 | else /* 64-bit elf */ | |
655 | { | |
656 | for (bufend = buf + dyninfo_sect_size; | |
657 | buf < bufend; | |
658 | buf += sizeof (Elf64_External_Dyn)) | |
659 | { | |
660 | Elf64_External_Dyn *x_dynp = (Elf64_External_Dyn *) buf; | |
661 | long dyn_tag; | |
662 | CORE_ADDR dyn_ptr; | |
663 | ||
664 | dyn_tag = bfd_h_get_64 (exec_bfd, (bfd_byte *) x_dynp->d_tag); | |
665 | if (dyn_tag == DT_NULL) | |
666 | break; | |
667 | else if (dyn_tag == DT_DEBUG) | |
668 | { | |
669 | dyn_ptr = bfd_h_get_64 (exec_bfd, | |
670 | (bfd_byte *) x_dynp->d_un.d_ptr); | |
671 | return dyn_ptr; | |
672 | } | |
673 | } | |
674 | } | |
675 | ||
676 | /* DT_DEBUG entry not found. */ | |
677 | return 0; | |
678 | } | |
679 | ||
680 | #endif /* SVR4_SHARED_LIBS */ | |
681 | ||
682 | /* | |
683 | ||
684 | LOCAL FUNCTION | |
685 | ||
686 | locate_base -- locate the base address of dynamic linker structs | |
687 | ||
688 | SYNOPSIS | |
689 | ||
690 | CORE_ADDR locate_base (void) | |
691 | ||
692 | DESCRIPTION | |
693 | ||
694 | For both the SunOS and SVR4 shared library implementations, if the | |
695 | inferior executable has been linked dynamically, there is a single | |
696 | address somewhere in the inferior's data space which is the key to | |
697 | locating all of the dynamic linker's runtime structures. This | |
698 | address is the value of the debug base symbol. The job of this | |
699 | function is to find and return that address, or to return 0 if there | |
700 | is no such address (the executable is statically linked for example). | |
701 | ||
702 | For SunOS, the job is almost trivial, since the dynamic linker and | |
703 | all of it's structures are statically linked to the executable at | |
704 | link time. Thus the symbol for the address we are looking for has | |
705 | already been added to the minimal symbol table for the executable's | |
706 | objfile at the time the symbol file's symbols were read, and all we | |
707 | have to do is look it up there. Note that we explicitly do NOT want | |
708 | to find the copies in the shared library. | |
709 | ||
710 | The SVR4 version is a bit more complicated because the address | |
711 | is contained somewhere in the dynamic info section. We have to go | |
712 | to a lot more work to discover the address of the debug base symbol. | |
713 | Because of this complexity, we cache the value we find and return that | |
714 | value on subsequent invocations. Note there is no copy in the | |
715 | executable symbol tables. | |
716 | ||
717 | */ | |
718 | ||
719 | static CORE_ADDR | |
720 | locate_base (void) | |
721 | { | |
722 | ||
723 | #ifndef SVR4_SHARED_LIBS | |
724 | ||
725 | struct minimal_symbol *msymbol; | |
726 | CORE_ADDR address = 0; | |
727 | char **symbolp; | |
728 | ||
729 | /* For SunOS, we want to limit the search for the debug base symbol to the | |
730 | executable being debugged, since there is a duplicate named symbol in the | |
731 | shared library. We don't want the shared library versions. */ | |
732 | ||
733 | for (symbolp = debug_base_symbols; *symbolp != NULL; symbolp++) | |
734 | { | |
735 | msymbol = lookup_minimal_symbol (*symbolp, NULL, symfile_objfile); | |
736 | if ((msymbol != NULL) && (SYMBOL_VALUE_ADDRESS (msymbol) != 0)) | |
737 | { | |
738 | address = SYMBOL_VALUE_ADDRESS (msymbol); | |
739 | return (address); | |
740 | } | |
741 | } | |
742 | return (0); | |
743 | ||
744 | #else /* SVR4_SHARED_LIBS */ | |
745 | ||
746 | /* Check to see if we have a currently valid address, and if so, avoid | |
747 | doing all this work again and just return the cached address. If | |
748 | we have no cached address, try to locate it in the dynamic info | |
749 | section for ELF executables. */ | |
750 | ||
751 | if (debug_base == 0) | |
752 | { | |
753 | if (exec_bfd != NULL | |
754 | && bfd_get_flavour (exec_bfd) == bfd_target_elf_flavour) | |
755 | debug_base = elf_locate_base (); | |
756 | #ifdef HANDLE_SVR4_EXEC_EMULATORS | |
757 | /* Try it the hard way for emulated executables. */ | |
39f77062 | 758 | else if (!ptid_equal (inferior_ptid, null_ptid) && target_has_execution) |
13437d4b KB |
759 | proc_iterate_over_mappings (look_for_base); |
760 | #endif | |
761 | } | |
762 | return (debug_base); | |
763 | ||
764 | #endif /* !SVR4_SHARED_LIBS */ | |
765 | ||
766 | } | |
767 | ||
768 | /* | |
769 | ||
770 | LOCAL FUNCTION | |
771 | ||
772 | first_link_map_member -- locate first member in dynamic linker's map | |
773 | ||
774 | SYNOPSIS | |
775 | ||
776 | static CORE_ADDR first_link_map_member (void) | |
777 | ||
778 | DESCRIPTION | |
779 | ||
780 | Find the first element in the inferior's dynamic link map, and | |
781 | return its address in the inferior. This function doesn't copy the | |
782 | link map entry itself into our address space; current_sos actually | |
783 | does the reading. */ | |
784 | ||
785 | static CORE_ADDR | |
786 | first_link_map_member (void) | |
787 | { | |
788 | CORE_ADDR lm = 0; | |
789 | ||
790 | #ifndef SVR4_SHARED_LIBS | |
791 | ||
792 | read_memory (debug_base, (char *) &dynamic_copy, sizeof (dynamic_copy)); | |
793 | if (dynamic_copy.ld_version >= 2) | |
794 | { | |
795 | /* It is a version that we can deal with, so read in the secondary | |
796 | structure and find the address of the link map list from it. */ | |
797 | read_memory (SOLIB_EXTRACT_ADDRESS (dynamic_copy.ld_un.ld_2), | |
798 | (char *) &ld_2_copy, sizeof (struct link_dynamic_2)); | |
799 | lm = SOLIB_EXTRACT_ADDRESS (ld_2_copy.ld_loaded); | |
800 | } | |
801 | ||
802 | #else /* SVR4_SHARED_LIBS */ | |
803 | struct link_map_offsets *lmo = SVR4_FETCH_LINK_MAP_OFFSETS (); | |
804 | char *r_map_buf = xmalloc (lmo->r_map_size); | |
b8c9b27d | 805 | struct cleanup *cleanups = make_cleanup (xfree, r_map_buf); |
13437d4b KB |
806 | |
807 | read_memory (debug_base + lmo->r_map_offset, r_map_buf, lmo->r_map_size); | |
808 | ||
809 | lm = extract_address (r_map_buf, lmo->r_map_size); | |
810 | ||
811 | /* FIXME: Perhaps we should validate the info somehow, perhaps by | |
812 | checking r_version for a known version number, or r_state for | |
813 | RT_CONSISTENT. */ | |
814 | ||
815 | do_cleanups (cleanups); | |
816 | ||
817 | #endif /* !SVR4_SHARED_LIBS */ | |
818 | ||
819 | return (lm); | |
820 | } | |
821 | ||
822 | #ifdef SVR4_SHARED_LIBS | |
823 | /* | |
824 | ||
825 | LOCAL FUNCTION | |
826 | ||
827 | open_symbol_file_object | |
828 | ||
829 | SYNOPSIS | |
830 | ||
831 | void open_symbol_file_object (void *from_tty) | |
832 | ||
833 | DESCRIPTION | |
834 | ||
835 | If no open symbol file, attempt to locate and open the main symbol | |
836 | file. On SVR4 systems, this is the first link map entry. If its | |
837 | name is here, we can open it. Useful when attaching to a process | |
838 | without first loading its symbol file. | |
839 | ||
840 | If FROM_TTYP dereferences to a non-zero integer, allow messages to | |
841 | be printed. This parameter is a pointer rather than an int because | |
842 | open_symbol_file_object() is called via catch_errors() and | |
843 | catch_errors() requires a pointer argument. */ | |
844 | ||
845 | static int | |
846 | open_symbol_file_object (void *from_ttyp) | |
847 | { | |
848 | CORE_ADDR lm, l_name; | |
849 | char *filename; | |
850 | int errcode; | |
851 | int from_tty = *(int *)from_ttyp; | |
852 | struct link_map_offsets *lmo = SVR4_FETCH_LINK_MAP_OFFSETS (); | |
853 | char *l_name_buf = xmalloc (lmo->l_name_size); | |
b8c9b27d | 854 | struct cleanup *cleanups = make_cleanup (xfree, l_name_buf); |
13437d4b KB |
855 | |
856 | if (symfile_objfile) | |
857 | if (!query ("Attempt to reload symbols from process? ")) | |
858 | return 0; | |
859 | ||
860 | if ((debug_base = locate_base ()) == 0) | |
861 | return 0; /* failed somehow... */ | |
862 | ||
863 | /* First link map member should be the executable. */ | |
864 | if ((lm = first_link_map_member ()) == 0) | |
865 | return 0; /* failed somehow... */ | |
866 | ||
867 | /* Read address of name from target memory to GDB. */ | |
868 | read_memory (lm + lmo->l_name_offset, l_name_buf, lmo->l_name_size); | |
869 | ||
870 | /* Convert the address to host format. */ | |
871 | l_name = extract_address (l_name_buf, lmo->l_name_size); | |
872 | ||
873 | /* Free l_name_buf. */ | |
874 | do_cleanups (cleanups); | |
875 | ||
876 | if (l_name == 0) | |
877 | return 0; /* No filename. */ | |
878 | ||
879 | /* Now fetch the filename from target memory. */ | |
880 | target_read_string (l_name, &filename, SO_NAME_MAX_PATH_SIZE - 1, &errcode); | |
881 | ||
882 | if (errcode) | |
883 | { | |
884 | warning ("failed to read exec filename from attached file: %s", | |
885 | safe_strerror (errcode)); | |
886 | return 0; | |
887 | } | |
888 | ||
b8c9b27d | 889 | make_cleanup (xfree, filename); |
13437d4b | 890 | /* Have a pathname: read the symbol file. */ |
1adeb98a | 891 | symbol_file_add_main (filename, from_tty); |
13437d4b KB |
892 | |
893 | return 1; | |
894 | } | |
895 | #else | |
896 | ||
897 | static int | |
21479ded | 898 | open_symbol_file_object (void *from_ttyp) |
13437d4b KB |
899 | { |
900 | return 1; | |
901 | } | |
902 | ||
903 | #endif /* SVR4_SHARED_LIBS */ | |
904 | ||
905 | ||
906 | /* LOCAL FUNCTION | |
907 | ||
908 | current_sos -- build a list of currently loaded shared objects | |
909 | ||
910 | SYNOPSIS | |
911 | ||
912 | struct so_list *current_sos () | |
913 | ||
914 | DESCRIPTION | |
915 | ||
916 | Build a list of `struct so_list' objects describing the shared | |
917 | objects currently loaded in the inferior. This list does not | |
918 | include an entry for the main executable file. | |
919 | ||
920 | Note that we only gather information directly available from the | |
921 | inferior --- we don't examine any of the shared library files | |
922 | themselves. The declaration of `struct so_list' says which fields | |
923 | we provide values for. */ | |
924 | ||
925 | static struct so_list * | |
926 | svr4_current_sos (void) | |
927 | { | |
928 | CORE_ADDR lm; | |
929 | struct so_list *head = 0; | |
930 | struct so_list **link_ptr = &head; | |
931 | ||
932 | /* Make sure we've looked up the inferior's dynamic linker's base | |
933 | structure. */ | |
934 | if (! debug_base) | |
935 | { | |
936 | debug_base = locate_base (); | |
937 | ||
938 | /* If we can't find the dynamic linker's base structure, this | |
939 | must not be a dynamically linked executable. Hmm. */ | |
940 | if (! debug_base) | |
941 | return 0; | |
942 | } | |
943 | ||
944 | /* Walk the inferior's link map list, and build our list of | |
945 | `struct so_list' nodes. */ | |
946 | lm = first_link_map_member (); | |
947 | while (lm) | |
948 | { | |
949 | struct link_map_offsets *lmo = SVR4_FETCH_LINK_MAP_OFFSETS (); | |
950 | struct so_list *new | |
951 | = (struct so_list *) xmalloc (sizeof (struct so_list)); | |
b8c9b27d | 952 | struct cleanup *old_chain = make_cleanup (xfree, new); |
13437d4b KB |
953 | |
954 | memset (new, 0, sizeof (*new)); | |
955 | ||
956 | new->lm_info = xmalloc (sizeof (struct lm_info)); | |
b8c9b27d | 957 | make_cleanup (xfree, new->lm_info); |
13437d4b KB |
958 | |
959 | new->lm_info->lm = xmalloc (lmo->link_map_size); | |
b8c9b27d | 960 | make_cleanup (xfree, new->lm_info->lm); |
13437d4b KB |
961 | memset (new->lm_info->lm, 0, lmo->link_map_size); |
962 | ||
963 | read_memory (lm, new->lm_info->lm, lmo->link_map_size); | |
964 | ||
965 | lm = LM_NEXT (new); | |
966 | ||
967 | /* For SVR4 versions, the first entry in the link map is for the | |
968 | inferior executable, so we must ignore it. For some versions of | |
969 | SVR4, it has no name. For others (Solaris 2.3 for example), it | |
970 | does have a name, so we can no longer use a missing name to | |
971 | decide when to ignore it. */ | |
972 | if (IGNORE_FIRST_LINK_MAP_ENTRY (new)) | |
973 | free_so (new); | |
974 | else | |
975 | { | |
976 | int errcode; | |
977 | char *buffer; | |
978 | ||
979 | /* Extract this shared object's name. */ | |
980 | target_read_string (LM_NAME (new), &buffer, | |
981 | SO_NAME_MAX_PATH_SIZE - 1, &errcode); | |
982 | if (errcode != 0) | |
983 | { | |
984 | warning ("current_sos: Can't read pathname for load map: %s\n", | |
985 | safe_strerror (errcode)); | |
986 | } | |
987 | else | |
988 | { | |
989 | strncpy (new->so_name, buffer, SO_NAME_MAX_PATH_SIZE - 1); | |
990 | new->so_name[SO_NAME_MAX_PATH_SIZE - 1] = '\0'; | |
b8c9b27d | 991 | xfree (buffer); |
13437d4b KB |
992 | strcpy (new->so_original_name, new->so_name); |
993 | } | |
994 | ||
995 | /* If this entry has no name, or its name matches the name | |
996 | for the main executable, don't include it in the list. */ | |
997 | if (! new->so_name[0] | |
998 | || match_main (new->so_name)) | |
999 | free_so (new); | |
1000 | else | |
1001 | { | |
1002 | new->next = 0; | |
1003 | *link_ptr = new; | |
1004 | link_ptr = &new->next; | |
1005 | } | |
1006 | } | |
1007 | ||
1008 | discard_cleanups (old_chain); | |
1009 | } | |
1010 | ||
1011 | return head; | |
1012 | } | |
1013 | ||
1014 | ||
1015 | /* On some systems, the only way to recognize the link map entry for | |
1016 | the main executable file is by looking at its name. Return | |
1017 | non-zero iff SONAME matches one of the known main executable names. */ | |
1018 | ||
1019 | static int | |
1020 | match_main (char *soname) | |
1021 | { | |
1022 | char **mainp; | |
1023 | ||
1024 | for (mainp = main_name_list; *mainp != NULL; mainp++) | |
1025 | { | |
1026 | if (strcmp (soname, *mainp) == 0) | |
1027 | return (1); | |
1028 | } | |
1029 | ||
1030 | return (0); | |
1031 | } | |
1032 | ||
1033 | ||
13437d4b KB |
1034 | /* Return 1 if PC lies in the dynamic symbol resolution code of the |
1035 | SVR4 run time loader. */ | |
d7fa2ae2 | 1036 | #ifdef SVR4_SHARED_LIBS |
13437d4b KB |
1037 | static CORE_ADDR interp_text_sect_low; |
1038 | static CORE_ADDR interp_text_sect_high; | |
1039 | static CORE_ADDR interp_plt_sect_low; | |
1040 | static CORE_ADDR interp_plt_sect_high; | |
1041 | ||
d7fa2ae2 KB |
1042 | static int |
1043 | svr4_in_dynsym_resolve_code (CORE_ADDR pc) | |
13437d4b KB |
1044 | { |
1045 | return ((pc >= interp_text_sect_low && pc < interp_text_sect_high) | |
1046 | || (pc >= interp_plt_sect_low && pc < interp_plt_sect_high) | |
1047 | || in_plt_section (pc, NULL)); | |
1048 | } | |
d7fa2ae2 KB |
1049 | #else /* !SVR4_SHARED_LIBS */ |
1050 | static int | |
1051 | svr4_in_dynsym_resolve_code (CORE_ADDR pc) | |
1052 | { | |
1053 | return 0; | |
1054 | } | |
1055 | #endif /* SVR4_SHARED_LIBS */ | |
13437d4b KB |
1056 | |
1057 | /* | |
1058 | ||
1059 | LOCAL FUNCTION | |
1060 | ||
1061 | disable_break -- remove the "mapping changed" breakpoint | |
1062 | ||
1063 | SYNOPSIS | |
1064 | ||
1065 | static int disable_break () | |
1066 | ||
1067 | DESCRIPTION | |
1068 | ||
1069 | Removes the breakpoint that gets hit when the dynamic linker | |
1070 | completes a mapping change. | |
1071 | ||
1072 | */ | |
1073 | ||
1074 | #ifndef SVR4_SHARED_LIBS | |
1075 | ||
1076 | static int | |
1077 | disable_break (void) | |
1078 | { | |
1079 | int status = 1; | |
1080 | ||
1081 | int in_debugger = 0; | |
1082 | ||
1083 | /* Read the debugger structure from the inferior to retrieve the | |
1084 | address of the breakpoint and the original contents of the | |
1085 | breakpoint address. Remove the breakpoint by writing the original | |
1086 | contents back. */ | |
1087 | ||
1088 | read_memory (debug_addr, (char *) &debug_copy, sizeof (debug_copy)); | |
1089 | ||
1090 | /* Set `in_debugger' to zero now. */ | |
1091 | ||
1092 | write_memory (flag_addr, (char *) &in_debugger, sizeof (in_debugger)); | |
1093 | ||
1094 | breakpoint_addr = SOLIB_EXTRACT_ADDRESS (debug_copy.ldd_bp_addr); | |
1095 | write_memory (breakpoint_addr, (char *) &debug_copy.ldd_bp_inst, | |
1096 | sizeof (debug_copy.ldd_bp_inst)); | |
1097 | ||
1098 | /* For the SVR4 version, we always know the breakpoint address. For the | |
1099 | SunOS version we don't know it until the above code is executed. | |
1100 | Grumble if we are stopped anywhere besides the breakpoint address. */ | |
1101 | ||
1102 | if (stop_pc != breakpoint_addr) | |
1103 | { | |
1104 | warning ("stopped at unknown breakpoint while handling shared libraries"); | |
1105 | } | |
1106 | ||
1107 | return (status); | |
1108 | } | |
1109 | ||
1110 | #endif /* #ifdef SVR4_SHARED_LIBS */ | |
1111 | ||
1112 | /* | |
1113 | ||
1114 | LOCAL FUNCTION | |
1115 | ||
1116 | enable_break -- arrange for dynamic linker to hit breakpoint | |
1117 | ||
1118 | SYNOPSIS | |
1119 | ||
1120 | int enable_break (void) | |
1121 | ||
1122 | DESCRIPTION | |
1123 | ||
1124 | Both the SunOS and the SVR4 dynamic linkers have, as part of their | |
1125 | debugger interface, support for arranging for the inferior to hit | |
1126 | a breakpoint after mapping in the shared libraries. This function | |
1127 | enables that breakpoint. | |
1128 | ||
1129 | For SunOS, there is a special flag location (in_debugger) which we | |
1130 | set to 1. When the dynamic linker sees this flag set, it will set | |
1131 | a breakpoint at a location known only to itself, after saving the | |
1132 | original contents of that place and the breakpoint address itself, | |
1133 | in it's own internal structures. When we resume the inferior, it | |
1134 | will eventually take a SIGTRAP when it runs into the breakpoint. | |
1135 | We handle this (in a different place) by restoring the contents of | |
1136 | the breakpointed location (which is only known after it stops), | |
1137 | chasing around to locate the shared libraries that have been | |
1138 | loaded, then resuming. | |
1139 | ||
1140 | For SVR4, the debugger interface structure contains a member (r_brk) | |
1141 | which is statically initialized at the time the shared library is | |
1142 | built, to the offset of a function (_r_debug_state) which is guaran- | |
1143 | teed to be called once before mapping in a library, and again when | |
1144 | the mapping is complete. At the time we are examining this member, | |
1145 | it contains only the unrelocated offset of the function, so we have | |
1146 | to do our own relocation. Later, when the dynamic linker actually | |
1147 | runs, it relocates r_brk to be the actual address of _r_debug_state(). | |
1148 | ||
1149 | The debugger interface structure also contains an enumeration which | |
1150 | is set to either RT_ADD or RT_DELETE prior to changing the mapping, | |
1151 | depending upon whether or not the library is being mapped or unmapped, | |
1152 | and then set to RT_CONSISTENT after the library is mapped/unmapped. | |
1153 | */ | |
1154 | ||
1155 | static int | |
1156 | enable_break (void) | |
1157 | { | |
1158 | int success = 0; | |
1159 | ||
1160 | #ifndef SVR4_SHARED_LIBS | |
1161 | ||
1162 | int j; | |
1163 | int in_debugger; | |
1164 | ||
1165 | /* Get link_dynamic structure */ | |
1166 | ||
1167 | j = target_read_memory (debug_base, (char *) &dynamic_copy, | |
1168 | sizeof (dynamic_copy)); | |
1169 | if (j) | |
1170 | { | |
1171 | /* unreadable */ | |
1172 | return (0); | |
1173 | } | |
1174 | ||
1175 | /* Calc address of debugger interface structure */ | |
1176 | ||
1177 | debug_addr = SOLIB_EXTRACT_ADDRESS (dynamic_copy.ldd); | |
1178 | ||
1179 | /* Calc address of `in_debugger' member of debugger interface structure */ | |
1180 | ||
1181 | flag_addr = debug_addr + (CORE_ADDR) ((char *) &debug_copy.ldd_in_debugger - | |
1182 | (char *) &debug_copy); | |
1183 | ||
1184 | /* Write a value of 1 to this member. */ | |
1185 | ||
1186 | in_debugger = 1; | |
1187 | write_memory (flag_addr, (char *) &in_debugger, sizeof (in_debugger)); | |
1188 | success = 1; | |
1189 | ||
1190 | #else /* SVR4_SHARED_LIBS */ | |
1191 | ||
1192 | #ifdef BKPT_AT_SYMBOL | |
1193 | ||
1194 | struct minimal_symbol *msymbol; | |
1195 | char **bkpt_namep; | |
1196 | asection *interp_sect; | |
1197 | ||
1198 | /* First, remove all the solib event breakpoints. Their addresses | |
1199 | may have changed since the last time we ran the program. */ | |
1200 | remove_solib_event_breakpoints (); | |
1201 | ||
1202 | #ifdef SVR4_SHARED_LIBS | |
1203 | interp_text_sect_low = interp_text_sect_high = 0; | |
1204 | interp_plt_sect_low = interp_plt_sect_high = 0; | |
1205 | ||
1206 | /* Find the .interp section; if not found, warn the user and drop | |
1207 | into the old breakpoint at symbol code. */ | |
1208 | interp_sect = bfd_get_section_by_name (exec_bfd, ".interp"); | |
1209 | if (interp_sect) | |
1210 | { | |
1211 | unsigned int interp_sect_size; | |
1212 | char *buf; | |
8ad2fcde KB |
1213 | CORE_ADDR load_addr = 0; |
1214 | int load_addr_found = 0; | |
1215 | struct so_list *inferior_sos; | |
e4f7b8c8 MS |
1216 | bfd *tmp_bfd = NULL; |
1217 | int tmp_fd = -1; | |
1218 | char *tmp_pathname = NULL; | |
13437d4b KB |
1219 | CORE_ADDR sym_addr = 0; |
1220 | ||
1221 | /* Read the contents of the .interp section into a local buffer; | |
1222 | the contents specify the dynamic linker this program uses. */ | |
1223 | interp_sect_size = bfd_section_size (exec_bfd, interp_sect); | |
1224 | buf = alloca (interp_sect_size); | |
1225 | bfd_get_section_contents (exec_bfd, interp_sect, | |
1226 | buf, 0, interp_sect_size); | |
1227 | ||
1228 | /* Now we need to figure out where the dynamic linker was | |
1229 | loaded so that we can load its symbols and place a breakpoint | |
1230 | in the dynamic linker itself. | |
1231 | ||
1232 | This address is stored on the stack. However, I've been unable | |
1233 | to find any magic formula to find it for Solaris (appears to | |
1234 | be trivial on GNU/Linux). Therefore, we have to try an alternate | |
1235 | mechanism to find the dynamic linker's base address. */ | |
e4f7b8c8 MS |
1236 | |
1237 | tmp_fd = solib_open (buf, &tmp_pathname); | |
1238 | if (tmp_fd >= 0) | |
1239 | tmp_bfd = bfd_fdopenr (tmp_pathname, gnutarget, tmp_fd); | |
1240 | ||
13437d4b KB |
1241 | if (tmp_bfd == NULL) |
1242 | goto bkpt_at_symbol; | |
1243 | ||
1244 | /* Make sure the dynamic linker's really a useful object. */ | |
1245 | if (!bfd_check_format (tmp_bfd, bfd_object)) | |
1246 | { | |
1247 | warning ("Unable to grok dynamic linker %s as an object file", buf); | |
1248 | bfd_close (tmp_bfd); | |
1249 | goto bkpt_at_symbol; | |
1250 | } | |
1251 | ||
8ad2fcde KB |
1252 | /* If the entry in _DYNAMIC for the dynamic linker has already |
1253 | been filled in, we can read its base address from there. */ | |
1254 | inferior_sos = svr4_current_sos (); | |
1255 | if (inferior_sos) | |
1256 | { | |
1257 | /* Connected to a running target. Update our shared library table. */ | |
1258 | solib_add (NULL, 0, NULL); | |
1259 | } | |
1260 | while (inferior_sos) | |
1261 | { | |
1262 | if (strcmp (buf, inferior_sos->so_original_name) == 0) | |
1263 | { | |
1264 | load_addr_found = 1; | |
1265 | load_addr = LM_ADDR (inferior_sos); | |
1266 | break; | |
1267 | } | |
1268 | inferior_sos = inferior_sos->next; | |
1269 | } | |
1270 | ||
1271 | /* Otherwise we find the dynamic linker's base address by examining | |
1272 | the current pc (which should point at the entry point for the | |
1273 | dynamic linker) and subtracting the offset of the entry point. */ | |
1274 | if (!load_addr_found) | |
1275 | load_addr = read_pc () - tmp_bfd->start_address; | |
13437d4b KB |
1276 | |
1277 | /* Record the relocated start and end address of the dynamic linker | |
d7fa2ae2 | 1278 | text and plt section for svr4_in_dynsym_resolve_code. */ |
13437d4b KB |
1279 | interp_sect = bfd_get_section_by_name (tmp_bfd, ".text"); |
1280 | if (interp_sect) | |
1281 | { | |
1282 | interp_text_sect_low = | |
1283 | bfd_section_vma (tmp_bfd, interp_sect) + load_addr; | |
1284 | interp_text_sect_high = | |
1285 | interp_text_sect_low + bfd_section_size (tmp_bfd, interp_sect); | |
1286 | } | |
1287 | interp_sect = bfd_get_section_by_name (tmp_bfd, ".plt"); | |
1288 | if (interp_sect) | |
1289 | { | |
1290 | interp_plt_sect_low = | |
1291 | bfd_section_vma (tmp_bfd, interp_sect) + load_addr; | |
1292 | interp_plt_sect_high = | |
1293 | interp_plt_sect_low + bfd_section_size (tmp_bfd, interp_sect); | |
1294 | } | |
1295 | ||
1296 | /* Now try to set a breakpoint in the dynamic linker. */ | |
1297 | for (bkpt_namep = solib_break_names; *bkpt_namep != NULL; bkpt_namep++) | |
1298 | { | |
1299 | sym_addr = bfd_lookup_symbol (tmp_bfd, *bkpt_namep); | |
1300 | if (sym_addr != 0) | |
1301 | break; | |
1302 | } | |
1303 | ||
1304 | /* We're done with the temporary bfd. */ | |
1305 | bfd_close (tmp_bfd); | |
1306 | ||
1307 | if (sym_addr != 0) | |
1308 | { | |
1309 | create_solib_event_breakpoint (load_addr + sym_addr); | |
1310 | return 1; | |
1311 | } | |
1312 | ||
1313 | /* For whatever reason we couldn't set a breakpoint in the dynamic | |
1314 | linker. Warn and drop into the old code. */ | |
1315 | bkpt_at_symbol: | |
1316 | warning ("Unable to find dynamic linker breakpoint function.\nGDB will be unable to debug shared library initializers\nand track explicitly loaded dynamic code."); | |
1317 | } | |
1318 | #endif | |
1319 | ||
1320 | /* Scan through the list of symbols, trying to look up the symbol and | |
1321 | set a breakpoint there. Terminate loop when we/if we succeed. */ | |
1322 | ||
1323 | breakpoint_addr = 0; | |
1324 | for (bkpt_namep = bkpt_names; *bkpt_namep != NULL; bkpt_namep++) | |
1325 | { | |
1326 | msymbol = lookup_minimal_symbol (*bkpt_namep, NULL, symfile_objfile); | |
1327 | if ((msymbol != NULL) && (SYMBOL_VALUE_ADDRESS (msymbol) != 0)) | |
1328 | { | |
1329 | create_solib_event_breakpoint (SYMBOL_VALUE_ADDRESS (msymbol)); | |
1330 | return 1; | |
1331 | } | |
1332 | } | |
1333 | ||
1334 | /* Nothing good happened. */ | |
1335 | success = 0; | |
1336 | ||
1337 | #endif /* BKPT_AT_SYMBOL */ | |
1338 | ||
1339 | #endif /* !SVR4_SHARED_LIBS */ | |
1340 | ||
1341 | return (success); | |
1342 | } | |
1343 | ||
1344 | /* | |
1345 | ||
1346 | LOCAL FUNCTION | |
1347 | ||
1348 | special_symbol_handling -- additional shared library symbol handling | |
1349 | ||
1350 | SYNOPSIS | |
1351 | ||
1352 | void special_symbol_handling () | |
1353 | ||
1354 | DESCRIPTION | |
1355 | ||
1356 | Once the symbols from a shared object have been loaded in the usual | |
1357 | way, we are called to do any system specific symbol handling that | |
1358 | is needed. | |
1359 | ||
1360 | For SunOS4, this consists of grunging around in the dynamic | |
1361 | linkers structures to find symbol definitions for "common" symbols | |
1362 | and adding them to the minimal symbol table for the runtime common | |
1363 | objfile. | |
1364 | ||
1365 | */ | |
1366 | ||
1367 | static void | |
1368 | svr4_special_symbol_handling (void) | |
1369 | { | |
1370 | #ifndef SVR4_SHARED_LIBS | |
1371 | int j; | |
1372 | ||
1373 | if (debug_addr == 0) | |
1374 | { | |
1375 | /* Get link_dynamic structure */ | |
1376 | ||
1377 | j = target_read_memory (debug_base, (char *) &dynamic_copy, | |
1378 | sizeof (dynamic_copy)); | |
1379 | if (j) | |
1380 | { | |
1381 | /* unreadable */ | |
1382 | return; | |
1383 | } | |
1384 | ||
1385 | /* Calc address of debugger interface structure */ | |
1386 | /* FIXME, this needs work for cross-debugging of core files | |
1387 | (byteorder, size, alignment, etc). */ | |
1388 | ||
1389 | debug_addr = SOLIB_EXTRACT_ADDRESS (dynamic_copy.ldd); | |
1390 | } | |
1391 | ||
1392 | /* Read the debugger structure from the inferior, just to make sure | |
1393 | we have a current copy. */ | |
1394 | ||
1395 | j = target_read_memory (debug_addr, (char *) &debug_copy, | |
1396 | sizeof (debug_copy)); | |
1397 | if (j) | |
1398 | return; /* unreadable */ | |
1399 | ||
1400 | /* Get common symbol definitions for the loaded object. */ | |
1401 | ||
1402 | if (debug_copy.ldd_cp) | |
1403 | { | |
1404 | solib_add_common_symbols (SOLIB_EXTRACT_ADDRESS (debug_copy.ldd_cp)); | |
1405 | } | |
1406 | ||
1407 | #endif /* !SVR4_SHARED_LIBS */ | |
1408 | } | |
1409 | ||
e2a44558 KB |
1410 | /* Relocate the main executable. This function should be called upon |
1411 | stopping the inferior process at the entry point to the program. | |
1412 | The entry point from BFD is compared to the PC and if they are | |
1413 | different, the main executable is relocated by the proper amount. | |
1414 | ||
1415 | As written it will only attempt to relocate executables which | |
1416 | lack interpreter sections. It seems likely that only dynamic | |
1417 | linker executables will get relocated, though it should work | |
1418 | properly for a position-independent static executable as well. */ | |
1419 | ||
1420 | static void | |
1421 | svr4_relocate_main_executable (void) | |
1422 | { | |
1423 | asection *interp_sect; | |
1424 | CORE_ADDR pc = read_pc (); | |
1425 | ||
1426 | /* Decide if the objfile needs to be relocated. As indicated above, | |
1427 | we will only be here when execution is stopped at the beginning | |
1428 | of the program. Relocation is necessary if the address at which | |
1429 | we are presently stopped differs from the start address stored in | |
1430 | the executable AND there's no interpreter section. The condition | |
1431 | regarding the interpreter section is very important because if | |
1432 | there *is* an interpreter section, execution will begin there | |
1433 | instead. When there is an interpreter section, the start address | |
1434 | is (presumably) used by the interpreter at some point to start | |
1435 | execution of the program. | |
1436 | ||
1437 | If there is an interpreter, it is normal for it to be set to an | |
1438 | arbitrary address at the outset. The job of finding it is | |
1439 | handled in enable_break(). | |
1440 | ||
1441 | So, to summarize, relocations are necessary when there is no | |
1442 | interpreter section and the start address obtained from the | |
1443 | executable is different from the address at which GDB is | |
1444 | currently stopped. | |
1445 | ||
1446 | [ The astute reader will note that we also test to make sure that | |
1447 | the executable in question has the DYNAMIC flag set. It is my | |
1448 | opinion that this test is unnecessary (undesirable even). It | |
1449 | was added to avoid inadvertent relocation of an executable | |
1450 | whose e_type member in the ELF header is not ET_DYN. There may | |
1451 | be a time in the future when it is desirable to do relocations | |
1452 | on other types of files as well in which case this condition | |
1453 | should either be removed or modified to accomodate the new file | |
1454 | type. (E.g, an ET_EXEC executable which has been built to be | |
1455 | position-independent could safely be relocated by the OS if | |
1456 | desired. It is true that this violates the ABI, but the ABI | |
1457 | has been known to be bent from time to time.) - Kevin, Nov 2000. ] | |
1458 | */ | |
1459 | ||
1460 | interp_sect = bfd_get_section_by_name (exec_bfd, ".interp"); | |
1461 | if (interp_sect == NULL | |
1462 | && (bfd_get_file_flags (exec_bfd) & DYNAMIC) != 0 | |
1463 | && bfd_get_start_address (exec_bfd) != pc) | |
1464 | { | |
1465 | struct cleanup *old_chain; | |
1466 | struct section_offsets *new_offsets; | |
1467 | int i, changed; | |
1468 | CORE_ADDR displacement; | |
1469 | ||
1470 | /* It is necessary to relocate the objfile. The amount to | |
1471 | relocate by is simply the address at which we are stopped | |
1472 | minus the starting address from the executable. | |
1473 | ||
1474 | We relocate all of the sections by the same amount. This | |
1475 | behavior is mandated by recent editions of the System V ABI. | |
1476 | According to the System V Application Binary Interface, | |
1477 | Edition 4.1, page 5-5: | |
1478 | ||
1479 | ... Though the system chooses virtual addresses for | |
1480 | individual processes, it maintains the segments' relative | |
1481 | positions. Because position-independent code uses relative | |
1482 | addressesing between segments, the difference between | |
1483 | virtual addresses in memory must match the difference | |
1484 | between virtual addresses in the file. The difference | |
1485 | between the virtual address of any segment in memory and | |
1486 | the corresponding virtual address in the file is thus a | |
1487 | single constant value for any one executable or shared | |
1488 | object in a given process. This difference is the base | |
1489 | address. One use of the base address is to relocate the | |
1490 | memory image of the program during dynamic linking. | |
1491 | ||
1492 | The same language also appears in Edition 4.0 of the System V | |
1493 | ABI and is left unspecified in some of the earlier editions. */ | |
1494 | ||
1495 | displacement = pc - bfd_get_start_address (exec_bfd); | |
1496 | changed = 0; | |
1497 | ||
1498 | new_offsets = xcalloc (sizeof (struct section_offsets), | |
1499 | symfile_objfile->num_sections); | |
b8c9b27d | 1500 | old_chain = make_cleanup (xfree, new_offsets); |
e2a44558 KB |
1501 | |
1502 | for (i = 0; i < symfile_objfile->num_sections; i++) | |
1503 | { | |
1504 | if (displacement != ANOFFSET (symfile_objfile->section_offsets, i)) | |
1505 | changed = 1; | |
1506 | new_offsets->offsets[i] = displacement; | |
1507 | } | |
1508 | ||
1509 | if (changed) | |
1510 | objfile_relocate (symfile_objfile, new_offsets); | |
1511 | ||
1512 | do_cleanups (old_chain); | |
1513 | } | |
1514 | } | |
1515 | ||
13437d4b KB |
1516 | /* |
1517 | ||
1518 | GLOBAL FUNCTION | |
1519 | ||
1520 | svr4_solib_create_inferior_hook -- shared library startup support | |
1521 | ||
1522 | SYNOPSIS | |
1523 | ||
1524 | void svr4_solib_create_inferior_hook() | |
1525 | ||
1526 | DESCRIPTION | |
1527 | ||
1528 | When gdb starts up the inferior, it nurses it along (through the | |
1529 | shell) until it is ready to execute it's first instruction. At this | |
1530 | point, this function gets called via expansion of the macro | |
1531 | SOLIB_CREATE_INFERIOR_HOOK. | |
1532 | ||
1533 | For SunOS executables, this first instruction is typically the | |
1534 | one at "_start", or a similar text label, regardless of whether | |
1535 | the executable is statically or dynamically linked. The runtime | |
1536 | startup code takes care of dynamically linking in any shared | |
1537 | libraries, once gdb allows the inferior to continue. | |
1538 | ||
1539 | For SVR4 executables, this first instruction is either the first | |
1540 | instruction in the dynamic linker (for dynamically linked | |
1541 | executables) or the instruction at "start" for statically linked | |
1542 | executables. For dynamically linked executables, the system | |
1543 | first exec's /lib/libc.so.N, which contains the dynamic linker, | |
1544 | and starts it running. The dynamic linker maps in any needed | |
1545 | shared libraries, maps in the actual user executable, and then | |
1546 | jumps to "start" in the user executable. | |
1547 | ||
1548 | For both SunOS shared libraries, and SVR4 shared libraries, we | |
1549 | can arrange to cooperate with the dynamic linker to discover the | |
1550 | names of shared libraries that are dynamically linked, and the | |
1551 | base addresses to which they are linked. | |
1552 | ||
1553 | This function is responsible for discovering those names and | |
1554 | addresses, and saving sufficient information about them to allow | |
1555 | their symbols to be read at a later time. | |
1556 | ||
1557 | FIXME | |
1558 | ||
1559 | Between enable_break() and disable_break(), this code does not | |
1560 | properly handle hitting breakpoints which the user might have | |
1561 | set in the startup code or in the dynamic linker itself. Proper | |
1562 | handling will probably have to wait until the implementation is | |
1563 | changed to use the "breakpoint handler function" method. | |
1564 | ||
1565 | Also, what if child has exit()ed? Must exit loop somehow. | |
1566 | */ | |
1567 | ||
e2a44558 | 1568 | static void |
13437d4b KB |
1569 | svr4_solib_create_inferior_hook (void) |
1570 | { | |
e2a44558 KB |
1571 | /* Relocate the main executable if necessary. */ |
1572 | svr4_relocate_main_executable (); | |
1573 | ||
13437d4b KB |
1574 | /* If we are using the BKPT_AT_SYMBOL code, then we don't need the base |
1575 | yet. In fact, in the case of a SunOS4 executable being run on | |
1576 | Solaris, we can't get it yet. current_sos will get it when it needs | |
1577 | it. */ | |
1578 | #if !(defined (SVR4_SHARED_LIBS) && defined (BKPT_AT_SYMBOL)) | |
1579 | if ((debug_base = locate_base ()) == 0) | |
1580 | { | |
1581 | /* Can't find the symbol or the executable is statically linked. */ | |
1582 | return; | |
1583 | } | |
1584 | #endif | |
1585 | ||
1586 | if (!enable_break ()) | |
1587 | { | |
1588 | warning ("shared library handler failed to enable breakpoint"); | |
1589 | return; | |
1590 | } | |
1591 | ||
1592 | #if !defined(SVR4_SHARED_LIBS) || defined(_SCO_DS) | |
1593 | /* SCO and SunOS need the loop below, other systems should be using the | |
1594 | special shared library breakpoints and the shared library breakpoint | |
1595 | service routine. | |
1596 | ||
1597 | Now run the target. It will eventually hit the breakpoint, at | |
1598 | which point all of the libraries will have been mapped in and we | |
1599 | can go groveling around in the dynamic linker structures to find | |
1600 | out what we need to know about them. */ | |
1601 | ||
1602 | clear_proceed_status (); | |
1603 | stop_soon_quietly = 1; | |
1604 | stop_signal = TARGET_SIGNAL_0; | |
1605 | do | |
1606 | { | |
39f77062 | 1607 | target_resume (pid_to_ptid (-1), 0, stop_signal); |
13437d4b KB |
1608 | wait_for_inferior (); |
1609 | } | |
1610 | while (stop_signal != TARGET_SIGNAL_TRAP); | |
1611 | stop_soon_quietly = 0; | |
1612 | ||
1613 | #if !defined(_SCO_DS) | |
1614 | /* We are now either at the "mapping complete" breakpoint (or somewhere | |
1615 | else, a condition we aren't prepared to deal with anyway), so adjust | |
1616 | the PC as necessary after a breakpoint, disable the breakpoint, and | |
1617 | add any shared libraries that were mapped in. */ | |
1618 | ||
1619 | if (DECR_PC_AFTER_BREAK) | |
1620 | { | |
1621 | stop_pc -= DECR_PC_AFTER_BREAK; | |
1622 | write_register (PC_REGNUM, stop_pc); | |
1623 | } | |
1624 | ||
1625 | if (!disable_break ()) | |
1626 | { | |
1627 | warning ("shared library handler failed to disable breakpoint"); | |
1628 | } | |
1629 | ||
1630 | if (auto_solib_add) | |
1631 | solib_add ((char *) 0, 0, (struct target_ops *) 0); | |
1632 | #endif /* ! _SCO_DS */ | |
1633 | #endif | |
1634 | } | |
1635 | ||
1636 | static void | |
1637 | svr4_clear_solib (void) | |
1638 | { | |
1639 | debug_base = 0; | |
1640 | } | |
1641 | ||
1642 | static void | |
1643 | svr4_free_so (struct so_list *so) | |
1644 | { | |
b8c9b27d KB |
1645 | xfree (so->lm_info->lm); |
1646 | xfree (so->lm_info); | |
13437d4b KB |
1647 | } |
1648 | ||
749499cb KB |
1649 | static void |
1650 | svr4_relocate_section_addresses (struct so_list *so, | |
1651 | struct section_table *sec) | |
1652 | { | |
1653 | sec->addr += LM_ADDR (so); | |
1654 | sec->endaddr += LM_ADDR (so); | |
1655 | } | |
1656 | ||
1c4dcb57 KB |
1657 | /* set_solib_svr4_fetch_link_map_offsets() is intended to be called by |
1658 | a <arch>_gdbarch_init() function. It uses ``fetch_link_map_offsets_init'' | |
1659 | to temporarily hold a pointer to the link map offsets fetcher for | |
1660 | a particular architecture. Once the architecture is actually installed, | |
1661 | init_fetch_link_map_offsets(), below, will be called to install this | |
1662 | value in ``fetch_link_map_offsets''. After that, the gdbarch_swap | |
1663 | machinery will manage the contents of this variable whenever the | |
1664 | architecture changes. */ | |
1665 | ||
21479ded KB |
1666 | void |
1667 | set_solib_svr4_fetch_link_map_offsets (struct link_map_offsets *(*flmo) (void)) | |
1668 | { | |
1c4dcb57 | 1669 | fetch_link_map_offsets_init = flmo; |
21479ded KB |
1670 | } |
1671 | ||
1c4dcb57 KB |
1672 | /* Initialize the value of ``fetch_link_map_offsets'' when a new |
1673 | architecture is created. set_solib_svr4_fetch_link_map_offsets() | |
1674 | is used to set the value that ``fetch_link_map_offsets'' should | |
1675 | be initialized to. */ | |
1676 | ||
21479ded KB |
1677 | static void |
1678 | init_fetch_link_map_offsets (void) | |
1679 | { | |
1c4dcb57 KB |
1680 | if (fetch_link_map_offsets_init != NULL) |
1681 | fetch_link_map_offsets = fetch_link_map_offsets_init; | |
1682 | else | |
1683 | fetch_link_map_offsets = default_svr4_fetch_link_map_offsets; | |
1684 | ||
1685 | fetch_link_map_offsets_init = NULL; | |
21479ded KB |
1686 | } |
1687 | ||
13437d4b KB |
1688 | static struct target_so_ops svr4_so_ops; |
1689 | ||
1690 | void | |
1691 | _initialize_svr4_solib (void) | |
1692 | { | |
21479ded KB |
1693 | register_gdbarch_swap (&fetch_link_map_offsets, |
1694 | sizeof (fetch_link_map_offsets), | |
1695 | init_fetch_link_map_offsets); | |
1696 | ||
749499cb | 1697 | svr4_so_ops.relocate_section_addresses = svr4_relocate_section_addresses; |
13437d4b KB |
1698 | svr4_so_ops.free_so = svr4_free_so; |
1699 | svr4_so_ops.clear_solib = svr4_clear_solib; | |
1700 | svr4_so_ops.solib_create_inferior_hook = svr4_solib_create_inferior_hook; | |
1701 | svr4_so_ops.special_symbol_handling = svr4_special_symbol_handling; | |
1702 | svr4_so_ops.current_sos = svr4_current_sos; | |
1703 | svr4_so_ops.open_symbol_file_object = open_symbol_file_object; | |
d7fa2ae2 | 1704 | svr4_so_ops.in_dynsym_resolve_code = svr4_in_dynsym_resolve_code; |
13437d4b KB |
1705 | |
1706 | /* FIXME: Don't do this here. *_gdbarch_init() should set so_ops. */ | |
1707 | current_target_so_ops = &svr4_so_ops; | |
1708 | } | |
1709 |