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ab31aa69 | 1 | /* Handle SunOS shared libraries for GDB, the GNU Debugger. |
8dcef9cf | 2 | |
6aba47ca | 3 | Copyright (C) 1990, 1991, 1992, 1993, 1994, 1995, 1996, 1998, 1999, 2000, |
9b254dd1 | 4 | 2001, 2004, 2007, 2008 Free Software Foundation, Inc. |
ab31aa69 KB |
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 | |
a9762ec7 | 10 | the Free Software Foundation; either version 3 of the License, or |
ab31aa69 KB |
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 | |
a9762ec7 | 19 | along with this program. If not, see <http://www.gnu.org/licenses/>. */ |
ab31aa69 KB |
20 | |
21 | #include "defs.h" | |
22 | ||
23 | #include <sys/types.h> | |
24 | #include <signal.h> | |
25 | #include "gdb_string.h" | |
26 | #include <sys/param.h> | |
27 | #include <fcntl.h> | |
28 | ||
8dcef9cf | 29 | /* SunOS shared libs need the nlist structure. */ |
ab31aa69 KB |
30 | #include <a.out.h> |
31 | #include <link.h> | |
32 | ||
33 | #include "symtab.h" | |
34 | #include "bfd.h" | |
35 | #include "symfile.h" | |
36 | #include "objfiles.h" | |
37 | #include "gdbcore.h" | |
38 | #include "inferior.h" | |
39 | #include "solist.h" | |
03cc47f7 MK |
40 | #include "bcache.h" |
41 | #include "regcache.h" | |
ab31aa69 | 42 | |
8dcef9cf MK |
43 | /* The shared library implementation found on BSD a.out systems is |
44 | very similar to the SunOS implementation. However, the data | |
45 | structures defined in <link.h> are named very differently. Make up | |
46 | for those differences here. */ | |
47 | ||
48 | #ifdef HAVE_STRUCT_SO_MAP_WITH_SOM_MEMBERS | |
49 | ||
50 | /* FIXME: Temporary until the equivalent defines have been removed | |
51 | from all nm-*bsd*.h files. */ | |
52 | #ifndef link_dynamic | |
53 | ||
54 | /* Map `struct link_map' and its members. */ | |
55 | #define link_map so_map | |
56 | #define lm_addr som_addr | |
57 | #define lm_name som_path | |
58 | #define lm_next som_next | |
59 | ||
60 | /* Map `struct link_dynamic_2' and its members. */ | |
61 | #define link_dynamic_2 section_dispatch_table | |
62 | #define ld_loaded sdt_loaded | |
63 | ||
64 | /* Map `struct rtc_symb' and its members. */ | |
65 | #define rtc_symb rt_symbol | |
66 | #define rtc_sp rt_sp | |
67 | #define rtc_next rt_next | |
68 | ||
69 | /* Map `struct ld_debug' and its members. */ | |
70 | #define ld_debug so_debug | |
71 | #define ldd_in_debugger dd_in_debugger | |
72 | #define ldd_bp_addr dd_bpt_addr | |
73 | #define ldd_bp_inst dd_bpt_shadow | |
74 | #define ldd_cp dd_cc | |
75 | ||
76 | /* Map `struct link_dynamic' and its members. */ | |
77 | #define link_dynamic _dynamic | |
78 | #define ld_version d_version | |
79 | #define ldd d_debug | |
80 | #define ld_un d_un | |
81 | #define ld_2 d_sdt | |
82 | ||
83 | #endif | |
84 | ||
85 | #endif | |
86 | ||
ab31aa69 KB |
87 | /* Link map info to include in an allocated so_list entry */ |
88 | ||
89 | struct lm_info | |
90 | { | |
91 | /* Pointer to copy of link map from inferior. The type is char * | |
92 | rather than void *, so that we may use byte offsets to find the | |
93 | various fields without the need for a cast. */ | |
94 | char *lm; | |
95 | }; | |
96 | ||
97 | ||
98 | /* Symbols which are used to locate the base of the link map structures. */ | |
99 | ||
100 | static char *debug_base_symbols[] = | |
101 | { | |
102 | "_DYNAMIC", | |
103 | "_DYNAMIC__MGC", | |
104 | NULL | |
105 | }; | |
106 | ||
107 | static char *main_name_list[] = | |
108 | { | |
109 | "main_$main", | |
110 | NULL | |
111 | }; | |
112 | ||
ae0167b9 AC |
113 | /* Macro to extract an address from a solib structure. When GDB is |
114 | configured for some 32-bit targets (e.g. Solaris 2.7 sparc), BFD is | |
115 | configured to handle 64-bit targets, so CORE_ADDR is 64 bits. We | |
116 | have to extract only the significant bits of addresses to get the | |
117 | right address when accessing the core file BFD. | |
118 | ||
119 | Assume that the address is unsigned. */ | |
ab31aa69 KB |
120 | |
121 | #define SOLIB_EXTRACT_ADDRESS(MEMBER) \ | |
ae0167b9 | 122 | extract_unsigned_integer (&(MEMBER), sizeof (MEMBER)) |
ab31aa69 KB |
123 | |
124 | /* local data declarations */ | |
125 | ||
126 | static struct link_dynamic dynamic_copy; | |
127 | static struct link_dynamic_2 ld_2_copy; | |
128 | static struct ld_debug debug_copy; | |
129 | static CORE_ADDR debug_addr; | |
130 | static CORE_ADDR flag_addr; | |
131 | ||
132 | #ifndef offsetof | |
133 | #define offsetof(TYPE, MEMBER) ((unsigned long) &((TYPE *)0)->MEMBER) | |
134 | #endif | |
135 | #define fieldsize(TYPE, MEMBER) (sizeof (((TYPE *)0)->MEMBER)) | |
136 | ||
137 | /* link map access functions */ | |
138 | ||
139 | static CORE_ADDR | |
140 | LM_ADDR (struct so_list *so) | |
141 | { | |
142 | int lm_addr_offset = offsetof (struct link_map, lm_addr); | |
143 | int lm_addr_size = fieldsize (struct link_map, lm_addr); | |
144 | ||
145 | return (CORE_ADDR) extract_signed_integer (so->lm_info->lm + lm_addr_offset, | |
146 | lm_addr_size); | |
147 | } | |
148 | ||
149 | static CORE_ADDR | |
150 | LM_NEXT (struct so_list *so) | |
151 | { | |
152 | int lm_next_offset = offsetof (struct link_map, lm_next); | |
153 | int lm_next_size = fieldsize (struct link_map, lm_next); | |
154 | ||
ae0167b9 AC |
155 | /* Assume that the address is unsigned. */ |
156 | return extract_unsigned_integer (so->lm_info->lm + lm_next_offset, | |
157 | lm_next_size); | |
ab31aa69 KB |
158 | } |
159 | ||
160 | static CORE_ADDR | |
161 | LM_NAME (struct so_list *so) | |
162 | { | |
163 | int lm_name_offset = offsetof (struct link_map, lm_name); | |
164 | int lm_name_size = fieldsize (struct link_map, lm_name); | |
165 | ||
ae0167b9 AC |
166 | /* Assume that the address is unsigned. */ |
167 | return extract_unsigned_integer (so->lm_info->lm + lm_name_offset, | |
168 | lm_name_size); | |
ab31aa69 KB |
169 | } |
170 | ||
171 | static CORE_ADDR debug_base; /* Base of dynamic linker structures */ | |
172 | ||
173 | /* Local function prototypes */ | |
174 | ||
175 | static int match_main (char *); | |
176 | ||
177 | /* Allocate the runtime common object file. */ | |
178 | ||
179 | static void | |
180 | allocate_rt_common_objfile (void) | |
181 | { | |
182 | struct objfile *objfile; | |
183 | struct objfile *last_one; | |
184 | ||
185 | objfile = (struct objfile *) xmalloc (sizeof (struct objfile)); | |
186 | memset (objfile, 0, sizeof (struct objfile)); | |
ce1ed485 MK |
187 | objfile->psymbol_cache = bcache_xmalloc (); |
188 | objfile->macro_cache = bcache_xmalloc (); | |
1ab21617 | 189 | obstack_init (&objfile->objfile_obstack); |
982526a1 | 190 | objfile->name = xstrdup ("rt_common"); |
ab31aa69 KB |
191 | |
192 | /* Add this file onto the tail of the linked list of other such files. */ | |
193 | ||
194 | objfile->next = NULL; | |
195 | if (object_files == NULL) | |
196 | object_files = objfile; | |
197 | else | |
198 | { | |
199 | for (last_one = object_files; | |
200 | last_one->next; | |
201 | last_one = last_one->next); | |
202 | last_one->next = objfile; | |
203 | } | |
204 | ||
205 | rt_common_objfile = objfile; | |
206 | } | |
207 | ||
208 | /* Read all dynamically loaded common symbol definitions from the inferior | |
209 | and put them into the minimal symbol table for the runtime common | |
210 | objfile. */ | |
211 | ||
212 | static void | |
213 | solib_add_common_symbols (CORE_ADDR rtc_symp) | |
214 | { | |
215 | struct rtc_symb inferior_rtc_symb; | |
216 | struct nlist inferior_rtc_nlist; | |
217 | int len; | |
218 | char *name; | |
219 | ||
220 | /* Remove any runtime common symbols from previous runs. */ | |
221 | ||
222 | if (rt_common_objfile != NULL && rt_common_objfile->minimal_symbol_count) | |
223 | { | |
4a146b47 | 224 | obstack_free (&rt_common_objfile->objfile_obstack, 0); |
1ab21617 | 225 | obstack_init (&rt_common_objfile->objfile_obstack); |
ab31aa69 KB |
226 | rt_common_objfile->minimal_symbol_count = 0; |
227 | rt_common_objfile->msymbols = NULL; | |
15831452 | 228 | terminate_minimal_symbol_table (rt_common_objfile); |
ab31aa69 KB |
229 | } |
230 | ||
231 | init_minimal_symbol_collection (); | |
232 | make_cleanup_discard_minimal_symbols (); | |
233 | ||
234 | while (rtc_symp) | |
235 | { | |
236 | read_memory (rtc_symp, | |
237 | (char *) &inferior_rtc_symb, | |
238 | sizeof (inferior_rtc_symb)); | |
239 | read_memory (SOLIB_EXTRACT_ADDRESS (inferior_rtc_symb.rtc_sp), | |
240 | (char *) &inferior_rtc_nlist, | |
241 | sizeof (inferior_rtc_nlist)); | |
242 | if (inferior_rtc_nlist.n_type == N_COMM) | |
243 | { | |
244 | /* FIXME: The length of the symbol name is not available, but in the | |
245 | current implementation the common symbol is allocated immediately | |
246 | behind the name of the symbol. */ | |
247 | len = inferior_rtc_nlist.n_value - inferior_rtc_nlist.n_un.n_strx; | |
248 | ||
249 | name = xmalloc (len); | |
250 | read_memory (SOLIB_EXTRACT_ADDRESS (inferior_rtc_nlist.n_un.n_name), | |
251 | name, len); | |
252 | ||
253 | /* Allocate the runtime common objfile if necessary. */ | |
254 | if (rt_common_objfile == NULL) | |
255 | allocate_rt_common_objfile (); | |
256 | ||
257 | prim_record_minimal_symbol (name, inferior_rtc_nlist.n_value, | |
258 | mst_bss, rt_common_objfile); | |
259 | xfree (name); | |
260 | } | |
261 | rtc_symp = SOLIB_EXTRACT_ADDRESS (inferior_rtc_symb.rtc_next); | |
262 | } | |
263 | ||
264 | /* Install any minimal symbols that have been collected as the current | |
265 | minimal symbols for the runtime common objfile. */ | |
266 | ||
267 | install_minimal_symbols (rt_common_objfile); | |
268 | } | |
269 | ||
270 | ||
271 | /* | |
272 | ||
273 | LOCAL FUNCTION | |
274 | ||
275 | locate_base -- locate the base address of dynamic linker structs | |
276 | ||
277 | SYNOPSIS | |
278 | ||
279 | CORE_ADDR locate_base (void) | |
280 | ||
281 | DESCRIPTION | |
282 | ||
283 | For both the SunOS and SVR4 shared library implementations, if the | |
284 | inferior executable has been linked dynamically, there is a single | |
285 | address somewhere in the inferior's data space which is the key to | |
286 | locating all of the dynamic linker's runtime structures. This | |
287 | address is the value of the debug base symbol. The job of this | |
288 | function is to find and return that address, or to return 0 if there | |
289 | is no such address (the executable is statically linked for example). | |
290 | ||
291 | For SunOS, the job is almost trivial, since the dynamic linker and | |
292 | all of it's structures are statically linked to the executable at | |
293 | link time. Thus the symbol for the address we are looking for has | |
294 | already been added to the minimal symbol table for the executable's | |
295 | objfile at the time the symbol file's symbols were read, and all we | |
296 | have to do is look it up there. Note that we explicitly do NOT want | |
297 | to find the copies in the shared library. | |
298 | ||
299 | The SVR4 version is a bit more complicated because the address | |
300 | is contained somewhere in the dynamic info section. We have to go | |
301 | to a lot more work to discover the address of the debug base symbol. | |
302 | Because of this complexity, we cache the value we find and return that | |
303 | value on subsequent invocations. Note there is no copy in the | |
304 | executable symbol tables. | |
305 | ||
306 | */ | |
307 | ||
308 | static CORE_ADDR | |
309 | locate_base (void) | |
310 | { | |
311 | struct minimal_symbol *msymbol; | |
312 | CORE_ADDR address = 0; | |
313 | char **symbolp; | |
314 | ||
315 | /* For SunOS, we want to limit the search for the debug base symbol to the | |
316 | executable being debugged, since there is a duplicate named symbol in the | |
317 | shared library. We don't want the shared library versions. */ | |
318 | ||
319 | for (symbolp = debug_base_symbols; *symbolp != NULL; symbolp++) | |
320 | { | |
321 | msymbol = lookup_minimal_symbol (*symbolp, NULL, symfile_objfile); | |
322 | if ((msymbol != NULL) && (SYMBOL_VALUE_ADDRESS (msymbol) != 0)) | |
323 | { | |
324 | address = SYMBOL_VALUE_ADDRESS (msymbol); | |
325 | return (address); | |
326 | } | |
327 | } | |
328 | return (0); | |
329 | } | |
330 | ||
331 | /* | |
332 | ||
333 | LOCAL FUNCTION | |
334 | ||
335 | first_link_map_member -- locate first member in dynamic linker's map | |
336 | ||
337 | SYNOPSIS | |
338 | ||
339 | static CORE_ADDR first_link_map_member (void) | |
340 | ||
341 | DESCRIPTION | |
342 | ||
343 | Find the first element in the inferior's dynamic link map, and | |
344 | return its address in the inferior. This function doesn't copy the | |
345 | link map entry itself into our address space; current_sos actually | |
346 | does the reading. */ | |
347 | ||
348 | static CORE_ADDR | |
349 | first_link_map_member (void) | |
350 | { | |
351 | CORE_ADDR lm = 0; | |
352 | ||
353 | read_memory (debug_base, (char *) &dynamic_copy, sizeof (dynamic_copy)); | |
354 | if (dynamic_copy.ld_version >= 2) | |
355 | { | |
356 | /* It is a version that we can deal with, so read in the secondary | |
357 | structure and find the address of the link map list from it. */ | |
358 | read_memory (SOLIB_EXTRACT_ADDRESS (dynamic_copy.ld_un.ld_2), | |
359 | (char *) &ld_2_copy, sizeof (struct link_dynamic_2)); | |
360 | lm = SOLIB_EXTRACT_ADDRESS (ld_2_copy.ld_loaded); | |
361 | } | |
362 | return (lm); | |
363 | } | |
364 | ||
365 | static int | |
366 | open_symbol_file_object (void *from_ttyp) | |
367 | { | |
368 | return 1; | |
369 | } | |
370 | ||
371 | ||
372 | /* LOCAL FUNCTION | |
373 | ||
374 | current_sos -- build a list of currently loaded shared objects | |
375 | ||
376 | SYNOPSIS | |
377 | ||
378 | struct so_list *current_sos () | |
379 | ||
380 | DESCRIPTION | |
381 | ||
382 | Build a list of `struct so_list' objects describing the shared | |
383 | objects currently loaded in the inferior. This list does not | |
384 | include an entry for the main executable file. | |
385 | ||
386 | Note that we only gather information directly available from the | |
387 | inferior --- we don't examine any of the shared library files | |
388 | themselves. The declaration of `struct so_list' says which fields | |
389 | we provide values for. */ | |
390 | ||
391 | static struct so_list * | |
392 | sunos_current_sos (void) | |
393 | { | |
394 | CORE_ADDR lm; | |
395 | struct so_list *head = 0; | |
396 | struct so_list **link_ptr = &head; | |
397 | int errcode; | |
398 | char *buffer; | |
399 | ||
400 | /* Make sure we've looked up the inferior's dynamic linker's base | |
401 | structure. */ | |
402 | if (! debug_base) | |
403 | { | |
404 | debug_base = locate_base (); | |
405 | ||
406 | /* If we can't find the dynamic linker's base structure, this | |
407 | must not be a dynamically linked executable. Hmm. */ | |
408 | if (! debug_base) | |
409 | return 0; | |
410 | } | |
411 | ||
412 | /* Walk the inferior's link map list, and build our list of | |
413 | `struct so_list' nodes. */ | |
414 | lm = first_link_map_member (); | |
415 | while (lm) | |
416 | { | |
417 | struct so_list *new | |
418 | = (struct so_list *) xmalloc (sizeof (struct so_list)); | |
419 | struct cleanup *old_chain = make_cleanup (xfree, new); | |
420 | ||
421 | memset (new, 0, sizeof (*new)); | |
422 | ||
423 | new->lm_info = xmalloc (sizeof (struct lm_info)); | |
424 | make_cleanup (xfree, new->lm_info); | |
425 | ||
426 | new->lm_info->lm = xmalloc (sizeof (struct link_map)); | |
427 | make_cleanup (xfree, new->lm_info->lm); | |
428 | memset (new->lm_info->lm, 0, sizeof (struct link_map)); | |
429 | ||
430 | read_memory (lm, new->lm_info->lm, sizeof (struct link_map)); | |
431 | ||
432 | lm = LM_NEXT (new); | |
433 | ||
434 | /* Extract this shared object's name. */ | |
435 | target_read_string (LM_NAME (new), &buffer, | |
436 | SO_NAME_MAX_PATH_SIZE - 1, &errcode); | |
437 | if (errcode != 0) | |
8a3fe4f8 AC |
438 | warning (_("Can't read pathname for load map: %s."), |
439 | safe_strerror (errcode)); | |
ab31aa69 KB |
440 | else |
441 | { | |
442 | strncpy (new->so_name, buffer, SO_NAME_MAX_PATH_SIZE - 1); | |
443 | new->so_name[SO_NAME_MAX_PATH_SIZE - 1] = '\0'; | |
444 | xfree (buffer); | |
445 | strcpy (new->so_original_name, new->so_name); | |
446 | } | |
447 | ||
448 | /* If this entry has no name, or its name matches the name | |
449 | for the main executable, don't include it in the list. */ | |
450 | if (! new->so_name[0] | |
451 | || match_main (new->so_name)) | |
452 | free_so (new); | |
453 | else | |
454 | { | |
455 | new->next = 0; | |
456 | *link_ptr = new; | |
457 | link_ptr = &new->next; | |
458 | } | |
459 | ||
460 | discard_cleanups (old_chain); | |
461 | } | |
462 | ||
463 | return head; | |
464 | } | |
465 | ||
466 | ||
467 | /* On some systems, the only way to recognize the link map entry for | |
468 | the main executable file is by looking at its name. Return | |
469 | non-zero iff SONAME matches one of the known main executable names. */ | |
470 | ||
471 | static int | |
472 | match_main (char *soname) | |
473 | { | |
474 | char **mainp; | |
475 | ||
476 | for (mainp = main_name_list; *mainp != NULL; mainp++) | |
477 | { | |
478 | if (strcmp (soname, *mainp) == 0) | |
479 | return (1); | |
480 | } | |
481 | ||
482 | return (0); | |
483 | } | |
484 | ||
485 | ||
486 | static int | |
487 | sunos_in_dynsym_resolve_code (CORE_ADDR pc) | |
488 | { | |
489 | return 0; | |
490 | } | |
491 | ||
492 | /* | |
493 | ||
494 | LOCAL FUNCTION | |
495 | ||
496 | disable_break -- remove the "mapping changed" breakpoint | |
497 | ||
498 | SYNOPSIS | |
499 | ||
500 | static int disable_break () | |
501 | ||
502 | DESCRIPTION | |
503 | ||
504 | Removes the breakpoint that gets hit when the dynamic linker | |
505 | completes a mapping change. | |
506 | ||
507 | */ | |
508 | ||
509 | static int | |
510 | disable_break (void) | |
511 | { | |
512 | CORE_ADDR breakpoint_addr; /* Address where end bkpt is set */ | |
513 | ||
514 | int in_debugger = 0; | |
515 | ||
516 | /* Read the debugger structure from the inferior to retrieve the | |
517 | address of the breakpoint and the original contents of the | |
518 | breakpoint address. Remove the breakpoint by writing the original | |
519 | contents back. */ | |
520 | ||
521 | read_memory (debug_addr, (char *) &debug_copy, sizeof (debug_copy)); | |
522 | ||
523 | /* Set `in_debugger' to zero now. */ | |
524 | ||
525 | write_memory (flag_addr, (char *) &in_debugger, sizeof (in_debugger)); | |
526 | ||
527 | breakpoint_addr = SOLIB_EXTRACT_ADDRESS (debug_copy.ldd_bp_addr); | |
528 | write_memory (breakpoint_addr, (char *) &debug_copy.ldd_bp_inst, | |
529 | sizeof (debug_copy.ldd_bp_inst)); | |
530 | ||
531 | /* For the SVR4 version, we always know the breakpoint address. For the | |
532 | SunOS version we don't know it until the above code is executed. | |
533 | Grumble if we are stopped anywhere besides the breakpoint address. */ | |
534 | ||
535 | if (stop_pc != breakpoint_addr) | |
536 | { | |
8a3fe4f8 | 537 | warning (_("stopped at unknown breakpoint while handling shared libraries")); |
ab31aa69 KB |
538 | } |
539 | ||
540 | return 1; | |
541 | } | |
542 | ||
543 | ||
544 | /* | |
545 | ||
546 | LOCAL FUNCTION | |
547 | ||
548 | enable_break -- arrange for dynamic linker to hit breakpoint | |
549 | ||
550 | SYNOPSIS | |
551 | ||
552 | int enable_break (void) | |
553 | ||
554 | DESCRIPTION | |
555 | ||
556 | Both the SunOS and the SVR4 dynamic linkers have, as part of their | |
557 | debugger interface, support for arranging for the inferior to hit | |
558 | a breakpoint after mapping in the shared libraries. This function | |
559 | enables that breakpoint. | |
560 | ||
561 | For SunOS, there is a special flag location (in_debugger) which we | |
562 | set to 1. When the dynamic linker sees this flag set, it will set | |
563 | a breakpoint at a location known only to itself, after saving the | |
564 | original contents of that place and the breakpoint address itself, | |
565 | in it's own internal structures. When we resume the inferior, it | |
566 | will eventually take a SIGTRAP when it runs into the breakpoint. | |
567 | We handle this (in a different place) by restoring the contents of | |
568 | the breakpointed location (which is only known after it stops), | |
569 | chasing around to locate the shared libraries that have been | |
570 | loaded, then resuming. | |
571 | ||
572 | For SVR4, the debugger interface structure contains a member (r_brk) | |
573 | which is statically initialized at the time the shared library is | |
574 | built, to the offset of a function (_r_debug_state) which is guaran- | |
575 | teed to be called once before mapping in a library, and again when | |
576 | the mapping is complete. At the time we are examining this member, | |
577 | it contains only the unrelocated offset of the function, so we have | |
578 | to do our own relocation. Later, when the dynamic linker actually | |
579 | runs, it relocates r_brk to be the actual address of _r_debug_state(). | |
580 | ||
581 | The debugger interface structure also contains an enumeration which | |
582 | is set to either RT_ADD or RT_DELETE prior to changing the mapping, | |
583 | depending upon whether or not the library is being mapped or unmapped, | |
584 | and then set to RT_CONSISTENT after the library is mapped/unmapped. | |
585 | */ | |
586 | ||
587 | static int | |
588 | enable_break (void) | |
589 | { | |
590 | int success = 0; | |
591 | int j; | |
592 | int in_debugger; | |
593 | ||
594 | /* Get link_dynamic structure */ | |
595 | ||
596 | j = target_read_memory (debug_base, (char *) &dynamic_copy, | |
597 | sizeof (dynamic_copy)); | |
598 | if (j) | |
599 | { | |
600 | /* unreadable */ | |
601 | return (0); | |
602 | } | |
603 | ||
604 | /* Calc address of debugger interface structure */ | |
605 | ||
606 | debug_addr = SOLIB_EXTRACT_ADDRESS (dynamic_copy.ldd); | |
607 | ||
608 | /* Calc address of `in_debugger' member of debugger interface structure */ | |
609 | ||
610 | flag_addr = debug_addr + (CORE_ADDR) ((char *) &debug_copy.ldd_in_debugger - | |
611 | (char *) &debug_copy); | |
612 | ||
613 | /* Write a value of 1 to this member. */ | |
614 | ||
615 | in_debugger = 1; | |
616 | write_memory (flag_addr, (char *) &in_debugger, sizeof (in_debugger)); | |
617 | success = 1; | |
618 | ||
619 | return (success); | |
620 | } | |
621 | ||
622 | /* | |
623 | ||
624 | LOCAL FUNCTION | |
625 | ||
626 | special_symbol_handling -- additional shared library symbol handling | |
627 | ||
628 | SYNOPSIS | |
629 | ||
630 | void special_symbol_handling () | |
631 | ||
632 | DESCRIPTION | |
633 | ||
634 | Once the symbols from a shared object have been loaded in the usual | |
635 | way, we are called to do any system specific symbol handling that | |
636 | is needed. | |
637 | ||
638 | For SunOS4, this consists of grunging around in the dynamic | |
639 | linkers structures to find symbol definitions for "common" symbols | |
640 | and adding them to the minimal symbol table for the runtime common | |
641 | objfile. | |
642 | ||
643 | */ | |
644 | ||
645 | static void | |
646 | sunos_special_symbol_handling (void) | |
647 | { | |
648 | int j; | |
649 | ||
650 | if (debug_addr == 0) | |
651 | { | |
652 | /* Get link_dynamic structure */ | |
653 | ||
654 | j = target_read_memory (debug_base, (char *) &dynamic_copy, | |
655 | sizeof (dynamic_copy)); | |
656 | if (j) | |
657 | { | |
658 | /* unreadable */ | |
659 | return; | |
660 | } | |
661 | ||
662 | /* Calc address of debugger interface structure */ | |
663 | /* FIXME, this needs work for cross-debugging of core files | |
664 | (byteorder, size, alignment, etc). */ | |
665 | ||
666 | debug_addr = SOLIB_EXTRACT_ADDRESS (dynamic_copy.ldd); | |
667 | } | |
668 | ||
669 | /* Read the debugger structure from the inferior, just to make sure | |
670 | we have a current copy. */ | |
671 | ||
672 | j = target_read_memory (debug_addr, (char *) &debug_copy, | |
673 | sizeof (debug_copy)); | |
674 | if (j) | |
675 | return; /* unreadable */ | |
676 | ||
677 | /* Get common symbol definitions for the loaded object. */ | |
678 | ||
679 | if (debug_copy.ldd_cp) | |
680 | { | |
681 | solib_add_common_symbols (SOLIB_EXTRACT_ADDRESS (debug_copy.ldd_cp)); | |
682 | } | |
683 | } | |
684 | ||
ab31aa69 KB |
685 | /* |
686 | ||
687 | GLOBAL FUNCTION | |
688 | ||
689 | sunos_solib_create_inferior_hook -- shared library startup support | |
690 | ||
691 | SYNOPSIS | |
692 | ||
7095b863 | 693 | void sunos_solib_create_inferior_hook () |
ab31aa69 KB |
694 | |
695 | DESCRIPTION | |
696 | ||
697 | When gdb starts up the inferior, it nurses it along (through the | |
698 | shell) until it is ready to execute it's first instruction. At this | |
699 | point, this function gets called via expansion of the macro | |
700 | SOLIB_CREATE_INFERIOR_HOOK. | |
701 | ||
702 | For SunOS executables, this first instruction is typically the | |
703 | one at "_start", or a similar text label, regardless of whether | |
704 | the executable is statically or dynamically linked. The runtime | |
705 | startup code takes care of dynamically linking in any shared | |
706 | libraries, once gdb allows the inferior to continue. | |
707 | ||
708 | For SVR4 executables, this first instruction is either the first | |
709 | instruction in the dynamic linker (for dynamically linked | |
710 | executables) or the instruction at "start" for statically linked | |
711 | executables. For dynamically linked executables, the system | |
712 | first exec's /lib/libc.so.N, which contains the dynamic linker, | |
713 | and starts it running. The dynamic linker maps in any needed | |
714 | shared libraries, maps in the actual user executable, and then | |
715 | jumps to "start" in the user executable. | |
716 | ||
717 | For both SunOS shared libraries, and SVR4 shared libraries, we | |
718 | can arrange to cooperate with the dynamic linker to discover the | |
719 | names of shared libraries that are dynamically linked, and the | |
720 | base addresses to which they are linked. | |
721 | ||
722 | This function is responsible for discovering those names and | |
723 | addresses, and saving sufficient information about them to allow | |
724 | their symbols to be read at a later time. | |
725 | ||
726 | FIXME | |
727 | ||
728 | Between enable_break() and disable_break(), this code does not | |
729 | properly handle hitting breakpoints which the user might have | |
730 | set in the startup code or in the dynamic linker itself. Proper | |
731 | handling will probably have to wait until the implementation is | |
732 | changed to use the "breakpoint handler function" method. | |
733 | ||
734 | Also, what if child has exit()ed? Must exit loop somehow. | |
735 | */ | |
736 | ||
737 | static void | |
738 | sunos_solib_create_inferior_hook (void) | |
739 | { | |
ab31aa69 KB |
740 | if ((debug_base = locate_base ()) == 0) |
741 | { | |
742 | /* Can't find the symbol or the executable is statically linked. */ | |
743 | return; | |
744 | } | |
745 | ||
746 | if (!enable_break ()) | |
747 | { | |
8a3fe4f8 | 748 | warning (_("shared library handler failed to enable breakpoint")); |
ab31aa69 KB |
749 | return; |
750 | } | |
751 | ||
752 | /* SCO and SunOS need the loop below, other systems should be using the | |
753 | special shared library breakpoints and the shared library breakpoint | |
754 | service routine. | |
755 | ||
756 | Now run the target. It will eventually hit the breakpoint, at | |
757 | which point all of the libraries will have been mapped in and we | |
758 | can go groveling around in the dynamic linker structures to find | |
759 | out what we need to know about them. */ | |
760 | ||
761 | clear_proceed_status (); | |
c0236d92 | 762 | stop_soon = STOP_QUIETLY; |
ab31aa69 KB |
763 | stop_signal = TARGET_SIGNAL_0; |
764 | do | |
765 | { | |
766 | target_resume (pid_to_ptid (-1), 0, stop_signal); | |
ae123ec6 | 767 | wait_for_inferior (0); |
ab31aa69 KB |
768 | } |
769 | while (stop_signal != TARGET_SIGNAL_TRAP); | |
c0236d92 | 770 | stop_soon = NO_STOP_QUIETLY; |
ab31aa69 KB |
771 | |
772 | /* We are now either at the "mapping complete" breakpoint (or somewhere | |
773 | else, a condition we aren't prepared to deal with anyway), so adjust | |
774 | the PC as necessary after a breakpoint, disable the breakpoint, and | |
b4397864 UW |
775 | add any shared libraries that were mapped in. |
776 | ||
777 | Note that adjust_pc_after_break did not perform any PC adjustment, | |
778 | as the breakpoint the inferior just hit was not inserted by GDB, | |
779 | but by the dynamic loader itself, and is therefore not found on | |
780 | the GDB software break point list. Thus we have to adjust the | |
781 | PC here. */ | |
ab31aa69 | 782 | |
b798847d | 783 | if (gdbarch_decr_pc_after_break (current_gdbarch)) |
ab31aa69 | 784 | { |
b798847d | 785 | stop_pc -= gdbarch_decr_pc_after_break (current_gdbarch); |
982db460 | 786 | write_pc (stop_pc); |
ab31aa69 KB |
787 | } |
788 | ||
789 | if (!disable_break ()) | |
790 | { | |
8a3fe4f8 | 791 | warning (_("shared library handler failed to disable breakpoint")); |
ab31aa69 KB |
792 | } |
793 | ||
990f9fe3 | 794 | solib_add ((char *) 0, 0, (struct target_ops *) 0, auto_solib_add); |
ab31aa69 KB |
795 | } |
796 | ||
797 | static void | |
798 | sunos_clear_solib (void) | |
799 | { | |
800 | debug_base = 0; | |
801 | } | |
802 | ||
803 | static void | |
804 | sunos_free_so (struct so_list *so) | |
805 | { | |
806 | xfree (so->lm_info->lm); | |
807 | xfree (so->lm_info); | |
808 | } | |
809 | ||
810 | static void | |
811 | sunos_relocate_section_addresses (struct so_list *so, | |
812 | struct section_table *sec) | |
813 | { | |
814 | sec->addr += LM_ADDR (so); | |
815 | sec->endaddr += LM_ADDR (so); | |
816 | } | |
817 | ||
818 | static struct target_so_ops sunos_so_ops; | |
819 | ||
820 | void | |
821 | _initialize_sunos_solib (void) | |
822 | { | |
823 | sunos_so_ops.relocate_section_addresses = sunos_relocate_section_addresses; | |
824 | sunos_so_ops.free_so = sunos_free_so; | |
825 | sunos_so_ops.clear_solib = sunos_clear_solib; | |
826 | sunos_so_ops.solib_create_inferior_hook = sunos_solib_create_inferior_hook; | |
827 | sunos_so_ops.special_symbol_handling = sunos_special_symbol_handling; | |
828 | sunos_so_ops.current_sos = sunos_current_sos; | |
829 | sunos_so_ops.open_symbol_file_object = open_symbol_file_object; | |
830 | sunos_so_ops.in_dynsym_resolve_code = sunos_in_dynsym_resolve_code; | |
831 | ||
832 | /* FIXME: Don't do this here. *_gdbarch_init() should set so_ops. */ | |
833 | current_target_so_ops = &sunos_so_ops; | |
834 | } |