Commit | Line | Data |
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f8b76e70 FF |
1 | /* Handle SunOS and SVR4 shared libraries for GDB, the GNU Debugger. |
2 | Copyright 1990, 1991 Free Software Foundation, Inc. | |
3 | ||
bd5635a1 RP |
4 | This file is part of GDB. |
5 | ||
bdbd5f50 | 6 | This program is free software; you can redistribute it and/or modify |
bd5635a1 | 7 | it under the terms of the GNU General Public License as published by |
bdbd5f50 JG |
8 | the Free Software Foundation; either version 2 of the License, or |
9 | (at your option) any later version. | |
bd5635a1 | 10 | |
bdbd5f50 | 11 | This program is distributed in the hope that it will be useful, |
bd5635a1 RP |
12 | but WITHOUT ANY WARRANTY; without even the implied warranty of |
13 | MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the | |
14 | GNU General Public License for more details. | |
15 | ||
16 | You should have received a copy of the GNU General Public License | |
bdbd5f50 JG |
17 | along with this program; if not, write to the Free Software |
18 | Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA. */ | |
bd5635a1 | 19 | |
f8b76e70 | 20 | |
bd5635a1 | 21 | #include <sys/types.h> |
f8b76e70 | 22 | #include <signal.h> |
bd5635a1 RP |
23 | #include <string.h> |
24 | #include <link.h> | |
d0237a54 JK |
25 | #include <sys/param.h> |
26 | #include <fcntl.h> | |
27 | #include <stdio.h> | |
d261ece7 | 28 | #include <a.out.h> |
f8b76e70 | 29 | |
bd5635a1 | 30 | #include "defs.h" |
bd5635a1 RP |
31 | #include "symtab.h" |
32 | #include "gdbcore.h" | |
33 | #include "command.h" | |
b3fdaf3d | 34 | #include "target.h" |
2403f49b | 35 | #include "frame.h" |
bdbd5f50 JG |
36 | #include "regex.h" |
37 | #include "inferior.h" | |
38 | ||
f8b76e70 FF |
39 | extern char *getenv (); |
40 | extern char *elf_interpreter (); /* Interpreter name from exec file */ | |
41 | extern char *re_comp (); | |
42 | ||
43 | #define MAX_PATH_SIZE 256 /* FIXME: Should be dynamic */ | |
44 | ||
45 | /* On SVR4 systems, for the initial implementation, use main() as the | |
46 | "startup mapping complete" breakpoint address. The models for SunOS | |
47 | and SVR4 dynamic linking debugger support are different in that SunOS | |
48 | hits one breakpoint when all mapping is complete while using the SVR4 | |
49 | debugger support takes two breakpoint hits for each file mapped, and | |
50 | there is no way to know when the "last" one is hit. Both these | |
51 | mechanisms should be tied to a "breakpoint service routine" that | |
52 | gets automatically executed whenever one of the breakpoints indicating | |
53 | a change in mapping is hit. This is a future enhancement. (FIXME) */ | |
54 | ||
55 | #define BKPT_AT_MAIN 1 | |
56 | ||
57 | /* local data declarations */ | |
58 | ||
d261ece7 | 59 | #ifndef SVR4_SHARED_LIBS |
f8b76e70 FF |
60 | |
61 | #define DEBUG_BASE "_DYNAMIC" | |
62 | #define LM_ADDR(so) ((so) -> lm.lm_addr) | |
63 | #define LM_NEXT(so) ((so) -> lm.lm_next) | |
64 | #define LM_NAME(so) ((so) -> lm.lm_name) | |
65 | static struct link_dynamic dynamic_copy; | |
66 | static struct link_dynamic_2 ld_2_copy; | |
67 | static struct ld_debug debug_copy; | |
68 | static CORE_ADDR debug_addr; | |
69 | static CORE_ADDR flag_addr; | |
70 | ||
d261ece7 | 71 | #else /* SVR4_SHARED_LIBS */ |
f8b76e70 FF |
72 | |
73 | #define DEBUG_BASE "_r_debug" | |
74 | #define LM_ADDR(so) ((so) -> lm.l_addr) | |
75 | #define LM_NEXT(so) ((so) -> lm.l_next) | |
76 | #define LM_NAME(so) ((so) -> lm.l_name) | |
77 | static struct r_debug debug_copy; | |
f8b76e70 FF |
78 | char shadow_contents[BREAKPOINT_MAX]; /* Stash old bkpt addr contents */ |
79 | extern CORE_ADDR proc_base_address (); | |
80 | extern int proc_address_to_fd (); | |
81 | ||
d261ece7 | 82 | #endif /* !SVR4_SHARED_LIBS */ |
bd5635a1 | 83 | |
bd5635a1 | 84 | struct so_list { |
f8b76e70 FF |
85 | struct so_list *next; /* next structure in linked list */ |
86 | struct link_map lm; /* copy of link map from inferior */ | |
87 | struct link_map *lmaddr; /* addr in inferior lm was read from */ | |
88 | CORE_ADDR lmend; /* upper addr bound of mapped object */ | |
89 | char so_name[MAX_PATH_SIZE]; /* shared object lib name (FIXME) */ | |
90 | char symbols_loaded; /* flag: symbols read in yet? */ | |
91 | char from_tty; /* flag: print msgs? */ | |
92 | bfd *so_bfd; /* bfd for so_name */ | |
93 | struct section_table *sections; | |
94 | struct section_table *sections_end; | |
bd5635a1 RP |
95 | }; |
96 | ||
f8b76e70 FF |
97 | static struct so_list *so_list_head; /* List of known shared objects */ |
98 | static CORE_ADDR debug_base; /* Base of dynamic linker structures */ | |
99 | static CORE_ADDR breakpoint_addr; /* Address where end bkpt is set */ | |
100 | ||
bd5635a1 | 101 | |
d0237a54 | 102 | /* |
f8b76e70 FF |
103 | |
104 | LOCAL FUNCTION | |
105 | ||
106 | solib_map_sections -- open bfd and build sections for shared lib | |
107 | ||
108 | SYNOPSIS | |
109 | ||
110 | static void solib_map_sections (struct so_list *so) | |
111 | ||
112 | DESCRIPTION | |
113 | ||
114 | Given a pointer to one of the shared objects in our list | |
115 | of mapped objects, use the recorded name to open a bfd | |
116 | descriptor for the object, build a section table, and then | |
117 | relocate all the section addresses by the base address at | |
118 | which the shared object was mapped. | |
119 | ||
120 | FIXMES | |
121 | ||
122 | In most (all?) cases the shared object file name recorded in the | |
123 | dynamic linkage tables will be a fully qualified pathname. For | |
124 | cases where it isn't, do we really mimic the systems search | |
125 | mechanism correctly in the below code (particularly the tilde | |
126 | expansion stuff?). | |
127 | */ | |
128 | ||
d0237a54 | 129 | static void |
f8b76e70 FF |
130 | solib_map_sections (so) |
131 | struct so_list *so; | |
d0237a54 JK |
132 | { |
133 | char *filename; | |
134 | char *scratch_pathname; | |
135 | int scratch_chan; | |
136 | struct section_table *p; | |
137 | ||
f8b76e70 | 138 | filename = tilde_expand (so -> so_name); |
d0237a54 JK |
139 | make_cleanup (free, filename); |
140 | ||
141 | scratch_chan = openp (getenv ("PATH"), 1, filename, O_RDONLY, 0, | |
f8b76e70 | 142 | &scratch_pathname); |
d0237a54 | 143 | if (scratch_chan < 0) |
f8b76e70 FF |
144 | { |
145 | scratch_chan = openp (getenv ("LD_LIBRARY_PATH"), 1, filename, | |
146 | O_RDONLY, 0, &scratch_pathname); | |
147 | } | |
d0237a54 | 148 | if (scratch_chan < 0) |
f8b76e70 FF |
149 | { |
150 | perror_with_name (filename); | |
151 | } | |
152 | ||
153 | so -> so_bfd = bfd_fdopenr (scratch_pathname, NULL, scratch_chan); | |
154 | if (!so -> so_bfd) | |
155 | { | |
156 | error ("Could not open `%s' as an executable file: %s", | |
157 | scratch_pathname, bfd_errmsg (bfd_error)); | |
158 | } | |
159 | if (!bfd_check_format (so -> so_bfd, bfd_object)) | |
160 | { | |
161 | error ("\"%s\": not in executable format: %s.", | |
162 | scratch_pathname, bfd_errmsg (bfd_error)); | |
163 | } | |
164 | if (build_section_table (so -> so_bfd, &so -> sections, &so -> sections_end)) | |
165 | { | |
166 | error ("Can't find the file sections in `%s': %s", | |
167 | exec_bfd -> filename, bfd_errmsg (bfd_error)); | |
168 | } | |
169 | ||
170 | for (p = so -> sections; p < so -> sections_end; p++) | |
171 | { | |
172 | /* Relocate the section binding addresses as recorded in the shared | |
173 | object's file by the base address to which the object was actually | |
174 | mapped. */ | |
175 | p -> addr += (CORE_ADDR) LM_ADDR (so); | |
176 | p -> endaddr += (CORE_ADDR) LM_ADDR (so); | |
177 | so -> lmend = (CORE_ADDR) max (p -> endaddr, so -> lmend); | |
178 | } | |
179 | } | |
180 | ||
d261ece7 SG |
181 | /* Read all dynamically loaded common symbol definitions from the inferior |
182 | and add them to the misc_function_vector. */ | |
183 | ||
184 | static void | |
185 | solib_add_common_symbols (rtc_symp) | |
186 | struct rtc_symb *rtc_symp; | |
187 | { | |
188 | struct rtc_symb inferior_rtc_symb; | |
189 | struct nlist inferior_rtc_nlist; | |
190 | extern void discard_misc_bunches(); | |
191 | ||
192 | init_misc_bunches (); | |
193 | make_cleanup (discard_misc_bunches, 0); | |
194 | ||
195 | while (rtc_symp) | |
196 | { | |
197 | read_memory((CORE_ADDR)rtc_symp, | |
198 | &inferior_rtc_symb, | |
199 | sizeof(inferior_rtc_symb)); | |
200 | read_memory((CORE_ADDR)inferior_rtc_symb.rtc_sp, | |
201 | &inferior_rtc_nlist, | |
202 | sizeof(inferior_rtc_nlist)); | |
203 | if (inferior_rtc_nlist.n_type == N_COMM) | |
204 | { | |
205 | /* FIXME: The length of the symbol name is not available, but in the | |
206 | current implementation the common symbol is allocated immediately | |
207 | behind the name of the symbol. */ | |
208 | int len = inferior_rtc_nlist.n_value - inferior_rtc_nlist.n_un.n_strx; | |
209 | char *name, *origname; | |
210 | ||
211 | origname = name = xmalloc (len); | |
212 | read_memory((CORE_ADDR)inferior_rtc_nlist.n_un.n_name, name, len); | |
213 | ||
214 | /* Don't enter the symbol twice if the target is re-run. */ | |
215 | ||
216 | #ifdef NAMES_HAVE_UNDERSCORE | |
217 | if (*name == '_') | |
218 | name++; | |
219 | #endif | |
220 | if (lookup_misc_func (name) < 0) | |
221 | prim_record_misc_function (obsavestring (name, strlen (name)), | |
222 | inferior_rtc_nlist.n_value, | |
223 | mf_bss); | |
224 | free (origname); | |
225 | } | |
226 | rtc_symp = inferior_rtc_symb.rtc_next; | |
227 | } | |
228 | ||
229 | condense_misc_bunches (1); | |
230 | } | |
231 | ||
f8b76e70 FF |
232 | /* |
233 | ||
234 | LOCAL FUNCTION | |
235 | ||
236 | bfd_lookup_symbol -- lookup the value for a specific symbol | |
237 | ||
238 | SYNOPSIS | |
239 | ||
240 | CORE_ADDR bfd_lookup_symbol (bfd *abfd, char *symname) | |
241 | ||
242 | DESCRIPTION | |
243 | ||
244 | An expensive way to lookup the value of a single symbol for | |
245 | bfd's that are only temporary anyway. This is used by the | |
246 | shared library support to find the address of the debugger | |
247 | interface structures in the shared library. | |
248 | ||
249 | Note that 0 is specifically allowed as an error return (no | |
250 | such symbol). | |
251 | ||
252 | FIXME: See if there is a less "expensive" way of doing this. | |
253 | Also see if there is already another bfd or gdb function | |
254 | that specifically does this, and if so, use it. | |
255 | */ | |
256 | ||
257 | static CORE_ADDR | |
258 | DEFUN (bfd_lookup_symbol, (abfd, symname), | |
259 | bfd *abfd AND | |
260 | char *symname) | |
261 | { | |
262 | unsigned int storage_needed; | |
263 | asymbol *sym; | |
264 | asymbol **symbol_table; | |
265 | unsigned int number_of_symbols; | |
266 | unsigned int i; | |
267 | struct cleanup *back_to; | |
268 | CORE_ADDR symaddr = 0; | |
269 | enum misc_function_type mf_type; | |
270 | ||
271 | storage_needed = get_symtab_upper_bound (abfd); | |
272 | ||
273 | if (storage_needed > 0) | |
274 | { | |
275 | symbol_table = (asymbol **) bfd_xmalloc (storage_needed); | |
276 | back_to = make_cleanup (free, symbol_table); | |
277 | number_of_symbols = bfd_canonicalize_symtab (abfd, symbol_table); | |
278 | ||
279 | for (i = 0; i < number_of_symbols; i++) | |
d0237a54 | 280 | { |
f8b76e70 FF |
281 | sym = *symbol_table++; |
282 | if (strcmp (sym -> name, symname) == 0) | |
283 | { | |
284 | symaddr = sym -> value; | |
285 | break; | |
286 | } | |
d0237a54 | 287 | } |
f8b76e70 | 288 | do_cleanups (back_to); |
d0237a54 | 289 | } |
f8b76e70 | 290 | return (symaddr); |
d0237a54 JK |
291 | } |
292 | ||
f8b76e70 FF |
293 | /* |
294 | ||
d261ece7 SG |
295 | LOCAL FUNCTION |
296 | ||
297 | look_for_base -- examine file for each mapped address segment | |
298 | ||
299 | SYNOPSYS | |
300 | ||
301 | static int look_for_base (int fd, CORE_ADDR baseaddr) | |
302 | ||
303 | DESCRIPTION | |
304 | ||
305 | This function is passed to proc_iterate_over_mappings, which | |
306 | causes it to get called once for each mapped address space, with | |
307 | an open file descriptor for the file mapped to that space, and the | |
308 | base address of that mapped space. | |
309 | ||
310 | Our job is to find the symbol DEBUG_BASE in the file that this | |
311 | fd is open on, if it exists, and if so, initialize the dynamic | |
312 | linker structure base address debug_base. | |
313 | ||
314 | Note that this is a computationally expensive proposition, since | |
315 | we basically have to open a bfd on every call, so we specifically | |
316 | avoid opening the exec file. | |
317 | */ | |
318 | ||
319 | static int | |
320 | DEFUN (look_for_base, (fd, baseaddr), | |
321 | int fd AND | |
322 | CORE_ADDR baseaddr) | |
323 | { | |
324 | bfd *interp_bfd; | |
325 | CORE_ADDR address; | |
326 | ||
327 | /* If the fd is -1, then there is no file that corresponds to this | |
328 | mapped memory segment, so skip it. Also, if the fd corresponds | |
329 | to the exec file, skip it as well. */ | |
330 | ||
331 | if ((fd == -1) || fdmatch (fileno ((FILE *)(exec_bfd -> iostream)), fd)) | |
332 | { | |
333 | return (0); | |
334 | } | |
335 | ||
336 | /* Try to open whatever random file this fd corresponds to. Note that | |
337 | we have no way currently to find the filename. Don't gripe about | |
338 | any problems we might have, just fail. */ | |
339 | ||
340 | if ((interp_bfd = bfd_fdopenr ("unnamed", NULL, fd)) == NULL) | |
341 | { | |
342 | return (0); | |
343 | } | |
344 | if (!bfd_check_format (interp_bfd, bfd_object)) | |
345 | { | |
346 | bfd_close (interp_bfd); | |
347 | return (0); | |
348 | } | |
349 | ||
350 | /* Now try to find our DEBUG_BASE symbol in this file, which we at | |
351 | least know to be a valid ELF executable or shared library. */ | |
352 | ||
353 | if ((address = bfd_lookup_symbol (interp_bfd, DEBUG_BASE)) == 0) | |
354 | { | |
355 | bfd_close (interp_bfd); | |
356 | return (0); | |
357 | } | |
358 | ||
359 | /* Eureka! We found the symbol. But now we may need to relocate it | |
360 | by the base address. If the symbol's value is less than the base | |
361 | address of the shared library, then it hasn't yet been relocated | |
362 | by the dynamic linker, and we have to do it ourself. FIXME: Note | |
363 | that we make the assumption that the first segment that corresponds | |
364 | to the shared library has the base address to which the library | |
365 | was relocated. */ | |
366 | ||
367 | if (address < baseaddr) | |
368 | { | |
369 | address += baseaddr; | |
370 | } | |
371 | debug_base = address; | |
372 | bfd_close (interp_bfd); | |
373 | return (1); | |
374 | } | |
375 | ||
376 | /* | |
377 | ||
f8b76e70 FF |
378 | LOCAL FUNCTION |
379 | ||
380 | locate_base -- locate the base address of dynamic linker structs | |
381 | ||
382 | SYNOPSIS | |
383 | ||
384 | CORE_ADDR locate_base (void) | |
385 | ||
386 | DESCRIPTION | |
387 | ||
388 | For both the SunOS and SVR4 shared library implementations, if the | |
389 | inferior executable has been linked dynamically, there is a single | |
390 | address somewhere in the inferior's data space which is the key to | |
d261ece7 | 391 | locating all of the dynamic linker's runtime structures. This |
f8b76e70 FF |
392 | address is the value of the symbol defined by the macro DEBUG_BASE. |
393 | The job of this function is to find and return that address, or to | |
394 | return 0 if there is no such address (the executable is statically | |
395 | linked for example). | |
396 | ||
397 | For SunOS, the job is almost trivial, since the dynamic linker and | |
398 | all of it's structures are statically linked to the executable at | |
399 | link time. Thus the symbol for the address we are looking for has | |
400 | already been added to the misc function vector at the time the symbol | |
d261ece7 | 401 | file's symbols were read, and all we have to do is look it up there. |
f8b76e70 FF |
402 | |
403 | The SVR4 version is much more complicated because the dynamic linker | |
d261ece7 SG |
404 | and it's structures are located in the shared C library, which gets |
405 | run as the executable's "interpreter" by the kernel. We have to go | |
406 | to a lot more work to discover the address of DEBUG_BASE. Because | |
f8b76e70 | 407 | of this complexity, we cache the value we find and return that value |
d261ece7 | 408 | on subsequent invocations. |
f8b76e70 | 409 | |
d261ece7 SG |
410 | Note that we can assume nothing about the process state at the time |
411 | we need to find this address. We may be stopped on the first instruc- | |
412 | tion of the interpreter (C shared library), the first instruction of | |
413 | the executable itself, or somewhere else entirely (if we attached | |
414 | to the process for example). | |
f8b76e70 FF |
415 | |
416 | */ | |
417 | ||
418 | static CORE_ADDR | |
419 | locate_base () | |
420 | { | |
f8b76e70 | 421 | |
d261ece7 | 422 | #ifndef SVR4_SHARED_LIBS |
f8b76e70 FF |
423 | |
424 | int i; | |
d261ece7 | 425 | CORE_ADDR address = 0; |
f8b76e70 FF |
426 | |
427 | i = lookup_misc_func (DEBUG_BASE); | |
428 | if (i >= 0 && misc_function_vector[i].address != 0) | |
429 | { | |
430 | address = misc_function_vector[i].address; | |
431 | } | |
d261ece7 | 432 | return (address); |
f8b76e70 | 433 | |
d261ece7 | 434 | #else /* SVR4_SHARED_LIBS */ |
f8b76e70 | 435 | |
d261ece7 SG |
436 | /* Check to see if we have a currently valid address, and if so, avoid |
437 | doing all this work again and just return the cached address. If | |
438 | we have no cached address, ask the /proc support interface to iterate | |
439 | over the list of mapped address segments, calling look_for_base() for | |
440 | each segment. When we are done, we will have either found the base | |
441 | address or not. */ | |
f8b76e70 | 442 | |
d261ece7 | 443 | if (debug_base == 0) |
f8b76e70 | 444 | { |
d261ece7 | 445 | proc_iterate_over_mappings (look_for_base); |
f8b76e70 | 446 | } |
d261ece7 | 447 | return (debug_base); |
f8b76e70 | 448 | |
d261ece7 | 449 | #endif /* !SVR4_SHARED_LIBS */ |
f8b76e70 FF |
450 | |
451 | } | |
bd5635a1 | 452 | |
f8b76e70 FF |
453 | static struct link_map * |
454 | first_link_map_member () | |
bd5635a1 | 455 | { |
f8b76e70 FF |
456 | struct link_map *lm = NULL; |
457 | ||
d261ece7 | 458 | #ifndef SVR4_SHARED_LIBS |
f8b76e70 FF |
459 | |
460 | read_memory (debug_base, &dynamic_copy, sizeof (dynamic_copy)); | |
461 | if (dynamic_copy.ld_version >= 2) | |
462 | { | |
463 | /* It is a version that we can deal with, so read in the secondary | |
464 | structure and find the address of the link map list from it. */ | |
465 | read_memory ((CORE_ADDR) dynamic_copy.ld_un.ld_2, &ld_2_copy, | |
466 | sizeof (struct link_dynamic_2)); | |
467 | lm = ld_2_copy.ld_loaded; | |
468 | } | |
469 | ||
d261ece7 | 470 | #else /* SVR4_SHARED_LIBS */ |
f8b76e70 FF |
471 | |
472 | read_memory (debug_base, &debug_copy, sizeof (struct r_debug)); | |
473 | lm = debug_copy.r_map; | |
474 | ||
d261ece7 | 475 | #endif /* !SVR4_SHARED_LIBS */ |
d0237a54 | 476 | |
f8b76e70 FF |
477 | return (lm); |
478 | } | |
479 | ||
480 | /* | |
481 | ||
482 | GLOBAL FUNCTION | |
483 | ||
484 | find_solib -- step through list of shared objects | |
485 | ||
486 | SYNOPSIS | |
487 | ||
488 | struct so_list *find_solib (struct so_list *so_list_ptr) | |
489 | ||
490 | DESCRIPTION | |
491 | ||
492 | This module contains the routine which finds the names of any | |
493 | loaded "images" in the current process. The argument in must be | |
494 | NULL on the first call, and then the returned value must be passed | |
495 | in on subsequent calls. This provides the capability to "step" down | |
496 | the list of loaded objects. On the last object, a NULL value is | |
497 | returned. | |
d0237a54 | 498 | |
f8b76e70 FF |
499 | The arg and return value are "struct link_map" pointers, as defined |
500 | in <link.h>. | |
501 | */ | |
d0237a54 | 502 | |
f8b76e70 FF |
503 | struct so_list * |
504 | find_solib (so_list_ptr) | |
505 | struct so_list *so_list_ptr; /* Last lm or NULL for first one */ | |
506 | { | |
507 | struct so_list *so_list_next = NULL; | |
508 | struct link_map *lm = NULL; | |
509 | struct so_list *new; | |
510 | ||
511 | if (so_list_ptr == NULL) | |
512 | { | |
513 | /* We are setting up for a new scan through the loaded images. */ | |
514 | if ((so_list_next = so_list_head) == NULL) | |
515 | { | |
516 | /* We have not already read in the dynamic linking structures | |
517 | from the inferior, lookup the address of the base structure. */ | |
518 | debug_base = locate_base (); | |
519 | if (debug_base > 0) | |
520 | { | |
521 | /* Read the base structure in and find the address of the first | |
522 | link map list member. */ | |
523 | lm = first_link_map_member (); | |
524 | } | |
525 | } | |
526 | } | |
527 | else | |
528 | { | |
529 | /* We have been called before, and are in the process of walking | |
530 | the shared library list. Advance to the next shared object. */ | |
531 | if ((lm = LM_NEXT (so_list_ptr)) == NULL) | |
532 | { | |
533 | /* We have hit the end of the list, so check to see if any were | |
534 | added, but be quiet if we can't read from the target any more. */ | |
535 | int status = target_read_memory ((CORE_ADDR) so_list_ptr -> lmaddr, | |
536 | (char *) &(so_list_ptr -> lm), | |
537 | sizeof (struct link_map)); | |
538 | if (status == 0) | |
539 | { | |
540 | lm = LM_NEXT (so_list_ptr); | |
541 | } | |
542 | else | |
543 | { | |
544 | lm = NULL; | |
545 | } | |
546 | } | |
547 | so_list_next = so_list_ptr -> next; | |
548 | } | |
549 | if ((so_list_next == NULL) && (lm != NULL)) | |
550 | { | |
551 | /* Get next link map structure from inferior image and build a local | |
552 | abbreviated load_map structure */ | |
553 | new = (struct so_list *) xmalloc (sizeof (struct so_list)); | |
554 | (void) memset ((char *) new, 0, sizeof (struct so_list)); | |
555 | new -> lmaddr = lm; | |
556 | /* Add the new node as the next node in the list, or as the root | |
557 | node if this is the first one. */ | |
558 | if (so_list_ptr != NULL) | |
559 | { | |
560 | so_list_ptr -> next = new; | |
561 | } | |
562 | else | |
563 | { | |
564 | so_list_head = new; | |
565 | } | |
566 | so_list_next = new; | |
567 | read_memory ((CORE_ADDR) lm, &(new -> lm), sizeof (struct link_map)); | |
568 | /* For the SVR4 version, there is one entry that has no name | |
569 | (for the inferior executable) since it is not a shared object. */ | |
570 | if (LM_NAME (new) != 0) | |
571 | { | |
d261ece7 | 572 | (void) target_read_string((CORE_ADDR) LM_NAME (new), new -> so_name, |
f8b76e70 FF |
573 | MAX_PATH_SIZE - 1); |
574 | new -> so_name[MAX_PATH_SIZE - 1] = 0; | |
575 | solib_map_sections (new); | |
576 | } | |
577 | } | |
578 | return (so_list_next); | |
bd5635a1 | 579 | } |
d0237a54 | 580 | |
bdbd5f50 JG |
581 | /* A small stub to get us past the arg-passing pinhole of catch_errors. */ |
582 | ||
583 | static int | |
584 | symbol_add_stub (arg) | |
585 | char *arg; | |
d0237a54 | 586 | { |
f8b76e70 FF |
587 | register struct so_list *so = (struct so_list *) arg; /* catch_errs bogon */ |
588 | ||
589 | symbol_file_add (so -> so_name, so -> from_tty, | |
590 | (unsigned int) LM_ADDR (so), 0); | |
591 | return (1); | |
d0237a54 | 592 | } |
bd5635a1 | 593 | |
f8b76e70 FF |
594 | /* |
595 | ||
596 | GLOBAL FUNCTION | |
597 | ||
598 | solib_add -- add a shared library file to the symtab and section list | |
599 | ||
600 | SYNOPSIS | |
601 | ||
602 | void solib_add (char *arg_string, int from_tty, | |
603 | struct target_ops *target) | |
604 | ||
605 | DESCRIPTION | |
606 | ||
607 | */ | |
bdbd5f50 JG |
608 | |
609 | void | |
610 | solib_add (arg_string, from_tty, target) | |
611 | char *arg_string; | |
612 | int from_tty; | |
613 | struct target_ops *target; | |
bd5635a1 | 614 | { |
f8b76e70 FF |
615 | register struct so_list *so = NULL; /* link map state variable */ |
616 | char *re_err; | |
617 | int count; | |
618 | int old; | |
619 | ||
620 | if ((re_err = re_comp (arg_string ? arg_string : ".")) != NULL) | |
621 | { | |
622 | error ("Invalid regexp: %s", re_err); | |
623 | } | |
624 | ||
bdbd5f50 JG |
625 | /* Getting new symbols may change our opinion about what is |
626 | frameless. */ | |
627 | reinit_frame_cache (); | |
bdbd5f50 | 628 | |
f8b76e70 FF |
629 | while ((so = find_solib (so)) != NULL) |
630 | { | |
631 | if (so -> so_name[0] && re_exec (so -> so_name)) | |
632 | { | |
633 | if (so -> symbols_loaded) | |
634 | { | |
bdbd5f50 | 635 | if (from_tty) |
f8b76e70 FF |
636 | { |
637 | printf ("Symbols already loaded for %s\n", so -> so_name); | |
638 | } | |
639 | } | |
640 | else | |
641 | { | |
642 | so -> symbols_loaded = 1; | |
643 | so -> from_tty = from_tty; | |
644 | catch_errors (symbol_add_stub, (char *) so, | |
645 | "Error while reading shared library symbols:\n"); | |
646 | } | |
647 | } | |
648 | } | |
649 | ||
bdbd5f50 JG |
650 | /* Now add the shared library sections to the section table of the |
651 | specified target, if any. */ | |
f8b76e70 FF |
652 | if (target) |
653 | { | |
654 | /* Count how many new section_table entries there are. */ | |
655 | so = NULL; | |
656 | count = 0; | |
657 | while ((so = find_solib (so)) != NULL) | |
658 | { | |
659 | if (so -> so_name[0]) | |
660 | { | |
661 | count += so -> sections_end - so -> sections; | |
662 | } | |
663 | } | |
664 | ||
665 | if (count) | |
666 | { | |
667 | /* Reallocate the target's section table including the new size. */ | |
668 | if (target -> sections) | |
669 | { | |
670 | old = target -> sections_end - target -> sections; | |
671 | target -> sections = (struct section_table *) | |
672 | realloc ((char *)target -> sections, | |
673 | (sizeof (struct section_table)) * (count + old)); | |
674 | } | |
675 | else | |
676 | { | |
677 | old = 0; | |
678 | target -> sections = (struct section_table *) | |
679 | malloc ((sizeof (struct section_table)) * count); | |
680 | } | |
681 | target -> sections_end = target -> sections + (count + old); | |
682 | ||
683 | /* Add these section table entries to the target's table. */ | |
684 | while ((so = find_solib (so)) != NULL) | |
685 | { | |
686 | if (so -> so_name[0]) | |
687 | { | |
688 | count = so -> sections_end - so -> sections; | |
689 | bcopy (so -> sections, (char *)(target -> sections + old), | |
690 | (sizeof (struct section_table)) * count); | |
691 | old += count; | |
692 | } | |
693 | } | |
694 | } | |
695 | } | |
bd5635a1 | 696 | } |
bdbd5f50 | 697 | |
f8b76e70 | 698 | /* |
bd5635a1 | 699 | |
f8b76e70 FF |
700 | LOCAL FUNCTION |
701 | ||
702 | info_sharedlibrary_command -- code for "info sharedlibrary" | |
703 | ||
704 | SYNOPSIS | |
705 | ||
706 | static void info_sharedlibrary_command () | |
707 | ||
708 | DESCRIPTION | |
bd5635a1 | 709 | |
f8b76e70 FF |
710 | Walk through the shared library list and print information |
711 | about each attached library. | |
712 | */ | |
713 | ||
714 | static void | |
715 | info_sharedlibrary_command () | |
716 | { | |
717 | register struct so_list *so = NULL; /* link map state variable */ | |
718 | int header_done = 0; | |
719 | ||
720 | if (exec_bfd == NULL) | |
721 | { | |
722 | printf ("No exec file.\n"); | |
723 | return; | |
724 | } | |
725 | while ((so = find_solib (so)) != NULL) | |
726 | { | |
727 | if (so -> so_name[0]) | |
728 | { | |
729 | if (!header_done) | |
730 | { | |
731 | printf("%-12s%-12s%-12s%s\n", "From", "To", "Syms Read", | |
732 | "Shared Object Library"); | |
733 | header_done++; | |
734 | } | |
735 | printf ("%-12s", local_hex_string_custom (LM_ADDR (so), "08")); | |
736 | printf ("%-12s", local_hex_string_custom (so -> lmend, "08")); | |
737 | printf ("%-12s", so -> symbols_loaded ? "Yes" : "No"); | |
738 | printf ("%s\n", so -> so_name); | |
bd5635a1 | 739 | } |
bd5635a1 | 740 | } |
f8b76e70 FF |
741 | if (so_list_head == NULL) |
742 | { | |
743 | printf ("No shared libraries loaded at this time.\n"); | |
bd5635a1 RP |
744 | } |
745 | } | |
746 | ||
747 | /* | |
f8b76e70 FF |
748 | |
749 | GLOBAL FUNCTION | |
750 | ||
751 | solib_address -- check to see if an address is in a shared lib | |
752 | ||
753 | SYNOPSIS | |
754 | ||
755 | int solib_address (CORE_ADDR address) | |
756 | ||
757 | DESCRIPTION | |
758 | ||
759 | Provides a hook for other gdb routines to discover whether or | |
760 | not a particular address is within the mapped address space of | |
761 | a shared library. Any address between the base mapping address | |
762 | and the first address beyond the end of the last mapping, is | |
763 | considered to be within the shared library address space, for | |
764 | our purposes. | |
765 | ||
766 | For example, this routine is called at one point to disable | |
767 | breakpoints which are in shared libraries that are not currently | |
768 | mapped in. | |
769 | */ | |
770 | ||
bd5635a1 | 771 | int |
f8b76e70 | 772 | solib_address (address) |
bd5635a1 RP |
773 | CORE_ADDR address; |
774 | { | |
f8b76e70 FF |
775 | register struct so_list *so = 0; /* link map state variable */ |
776 | ||
777 | while ((so = find_solib (so)) != NULL) | |
778 | { | |
779 | if (so -> so_name[0]) | |
780 | { | |
781 | if ((address >= (CORE_ADDR) LM_ADDR (so)) && | |
782 | (address < (CORE_ADDR) so -> lmend)) | |
783 | { | |
784 | return (1); | |
785 | } | |
786 | } | |
787 | } | |
788 | return (0); | |
789 | } | |
790 | ||
791 | /* Called by free_all_symtabs */ | |
bd5635a1 | 792 | |
f8b76e70 FF |
793 | void |
794 | clear_solib() | |
795 | { | |
796 | struct so_list *next; | |
797 | ||
798 | while (so_list_head) | |
799 | { | |
800 | if (so_list_head -> sections) | |
801 | { | |
802 | free (so_list_head -> sections); | |
803 | } | |
804 | if (so_list_head -> so_bfd) | |
805 | { | |
806 | bfd_close (so_list_head -> so_bfd); | |
807 | } | |
808 | next = so_list_head -> next; | |
809 | free(so_list_head); | |
810 | so_list_head = next; | |
bd5635a1 | 811 | } |
f8b76e70 | 812 | debug_base = 0; |
bd5635a1 RP |
813 | } |
814 | ||
815 | /* | |
f8b76e70 FF |
816 | |
817 | LOCAL FUNCTION | |
818 | ||
819 | disable_break -- remove the "mapping changed" breakpoint | |
820 | ||
821 | SYNOPSIS | |
822 | ||
823 | static int disable_break () | |
824 | ||
825 | DESCRIPTION | |
826 | ||
827 | Removes the breakpoint that gets hit when the dynamic linker | |
828 | completes a mapping change. | |
829 | ||
bd5635a1 | 830 | */ |
f8b76e70 FF |
831 | |
832 | static int | |
833 | disable_break () | |
bd5635a1 | 834 | { |
f8b76e70 FF |
835 | int status = 1; |
836 | ||
d261ece7 | 837 | #ifndef SVR4_SHARED_LIBS |
f8b76e70 FF |
838 | |
839 | int in_debugger = 0; | |
840 | ||
f8b76e70 FF |
841 | /* Read the debugger structure from the inferior to retrieve the |
842 | address of the breakpoint and the original contents of the | |
843 | breakpoint address. Remove the breakpoint by writing the original | |
844 | contents back. */ | |
845 | ||
846 | read_memory (debug_addr, &debug_copy, sizeof (debug_copy)); | |
d261ece7 SG |
847 | |
848 | /* Get common symbol definitions for the loaded object. */ | |
849 | if (debug_copy.ldd_cp) | |
850 | solib_add_common_symbols (debug_copy.ldd_cp); | |
851 | ||
852 | /* Set `in_debugger' to zero now. */ | |
853 | ||
854 | write_memory (flag_addr, &in_debugger, sizeof (in_debugger)); | |
855 | ||
f8b76e70 FF |
856 | breakpoint_addr = (CORE_ADDR) debug_copy.ldd_bp_addr; |
857 | write_memory (breakpoint_addr, &debug_copy.ldd_bp_inst, | |
858 | sizeof (debug_copy.ldd_bp_inst)); | |
859 | ||
d261ece7 | 860 | #else /* SVR4_SHARED_LIBS */ |
f8b76e70 FF |
861 | |
862 | /* Note that breakpoint address and original contents are in our address | |
863 | space, so we just need to write the original contents back. */ | |
864 | ||
865 | if (memory_remove_breakpoint (breakpoint_addr, shadow_contents) != 0) | |
866 | { | |
867 | status = 0; | |
868 | } | |
869 | ||
d261ece7 | 870 | #endif /* !SVR4_SHARED_LIBS */ |
f8b76e70 FF |
871 | |
872 | /* For the SVR4 version, we always know the breakpoint address. For the | |
873 | SunOS version we don't know it until the above code is executed. | |
874 | Grumble if we are stopped anywhere besides the breakpoint address. */ | |
875 | ||
876 | if (stop_pc != breakpoint_addr) | |
877 | { | |
878 | warning ("stopped at unknown breakpoint while handling shared libraries"); | |
879 | } | |
880 | ||
881 | return (status); | |
bdbd5f50 JG |
882 | } |
883 | ||
f8b76e70 | 884 | /* |
bdbd5f50 | 885 | |
f8b76e70 FF |
886 | LOCAL FUNCTION |
887 | ||
888 | enable_break -- arrange for dynamic linker to hit breakpoint | |
889 | ||
890 | SYNOPSIS | |
891 | ||
892 | int enable_break (void) | |
893 | ||
894 | DESCRIPTION | |
895 | ||
896 | Both the SunOS and the SVR4 dynamic linkers have, as part of their | |
897 | debugger interface, support for arranging for the inferior to hit | |
898 | a breakpoint after mapping in the shared libraries. This function | |
899 | enables that breakpoint. | |
900 | ||
901 | For SunOS, there is a special flag location (in_debugger) which we | |
902 | set to 1. When the dynamic linker sees this flag set, it will set | |
903 | a breakpoint at a location known only to itself, after saving the | |
904 | original contents of that place and the breakpoint address itself, | |
905 | in it's own internal structures. When we resume the inferior, it | |
906 | will eventually take a SIGTRAP when it runs into the breakpoint. | |
907 | We handle this (in a different place) by restoring the contents of | |
908 | the breakpointed location (which is only known after it stops), | |
909 | chasing around to locate the shared libraries that have been | |
910 | loaded, then resuming. | |
911 | ||
912 | For SVR4, the debugger interface structure contains a member (r_brk) | |
913 | which is statically initialized at the time the shared library is | |
914 | built, to the offset of a function (_r_debug_state) which is guaran- | |
915 | teed to be called once before mapping in a library, and again when | |
916 | the mapping is complete. At the time we are examining this member, | |
917 | it contains only the unrelocated offset of the function, so we have | |
918 | to do our own relocation. Later, when the dynamic linker actually | |
919 | runs, it relocates r_brk to be the actual address of _r_debug_state(). | |
920 | ||
921 | The debugger interface structure also contains an enumeration which | |
922 | is set to either RT_ADD or RT_DELETE prior to changing the mapping, | |
923 | depending upon whether or not the library is being mapped or unmapped, | |
924 | and then set to RT_CONSISTENT after the library is mapped/unmapped. | |
925 | */ | |
926 | ||
927 | static int | |
928 | enable_break () | |
bdbd5f50 | 929 | { |
bdbd5f50 | 930 | |
f8b76e70 FF |
931 | int j; |
932 | ||
d261ece7 | 933 | #ifndef SVR4_SHARED_LIBS |
bdbd5f50 | 934 | |
f8b76e70 FF |
935 | int in_debugger; |
936 | ||
bdbd5f50 | 937 | /* Get link_dynamic structure */ |
f8b76e70 FF |
938 | |
939 | j = target_read_memory (debug_base, (char *) &dynamic_copy, | |
940 | sizeof (dynamic_copy)); | |
941 | if (j) | |
942 | { | |
943 | /* unreadable */ | |
944 | return (0); | |
945 | } | |
06b6c733 | 946 | |
bdbd5f50 | 947 | /* Calc address of debugger interface structure */ |
f8b76e70 FF |
948 | |
949 | debug_addr = (CORE_ADDR) dynamic_copy.ldd; | |
950 | ||
bdbd5f50 | 951 | /* Calc address of `in_debugger' member of debugger interface structure */ |
f8b76e70 FF |
952 | |
953 | flag_addr = debug_addr + (CORE_ADDR) ((char *) &debug_copy.ldd_in_debugger - | |
954 | (char *) &debug_copy); | |
955 | ||
bdbd5f50 | 956 | /* Write a value of 1 to this member. */ |
f8b76e70 | 957 | |
bdbd5f50 | 958 | in_debugger = 1; |
bdbd5f50 | 959 | |
f8b76e70 FF |
960 | write_memory (flag_addr, &in_debugger, sizeof (in_debugger)); |
961 | ||
d261ece7 | 962 | #else /* SVR4_SHARED_LIBS */ |
f8b76e70 FF |
963 | |
964 | #ifdef BKPT_AT_MAIN | |
965 | ||
966 | int i; | |
967 | ||
968 | i = lookup_misc_func ("main"); | |
969 | if (i >= 0 && misc_function_vector[i].address != 0) | |
970 | { | |
971 | breakpoint_addr = misc_function_vector[i].address; | |
972 | } | |
973 | else | |
974 | { | |
975 | return (0); | |
976 | } | |
977 | ||
978 | if (target_insert_breakpoint (breakpoint_addr, shadow_contents) != 0) | |
979 | { | |
980 | return (0); | |
981 | } | |
982 | ||
983 | #else /* !BKPT_AT_MAIN */ | |
984 | ||
985 | struct symtab_and_line sal; | |
986 | ||
987 | /* Read the debugger interface structure directly. */ | |
988 | ||
989 | read_memory (debug_base, (char *) &debug_copy, sizeof (debug_copy)); | |
990 | ||
991 | /* Set breakpoint at the debugger interface stub routine that will | |
992 | be called just prior to each mapping change and again after the | |
993 | mapping change is complete. Set up the (nonexistent) handler to | |
994 | deal with hitting these breakpoints. (FIXME). */ | |
995 | ||
996 | warning ("'%s': line %d: missing SVR4 support code", __FILE__, __LINE__); | |
997 | ||
998 | #endif /* BKPT_AT_MAIN */ | |
999 | ||
d261ece7 | 1000 | #endif /* !SVR4_SHARED_LIBS */ |
f8b76e70 FF |
1001 | |
1002 | return (1); | |
1003 | } | |
1004 | ||
1005 | /* | |
1006 | ||
1007 | GLOBAL FUNCTION | |
1008 | ||
1009 | solib_create_inferior_hook -- shared library startup support | |
1010 | ||
1011 | SYNOPSIS | |
1012 | ||
1013 | void solib_create_inferior_hook() | |
1014 | ||
1015 | DESCRIPTION | |
1016 | ||
1017 | When gdb starts up the inferior, it nurses it along (through the | |
1018 | shell) until it is ready to execute it's first instruction. At this | |
1019 | point, this function gets called via expansion of the macro | |
1020 | SOLIB_CREATE_INFERIOR_HOOK. | |
1021 | ||
1022 | For both SunOS shared libraries, and SVR4 shared libraries, we | |
1023 | can arrange to cooperate with the dynamic linker to discover the | |
1024 | names of shared libraries that are dynamically linked, and the | |
1025 | base addresses to which they are linked. | |
1026 | ||
1027 | This function is responsible for discovering those names and | |
1028 | addresses, and saving sufficient information about them to allow | |
1029 | their symbols to be read at a later time. | |
1030 | ||
1031 | FIXME | |
1032 | ||
1033 | Between enable_break() and disable_break(), this code does not | |
1034 | properly handle hitting breakpoints which the user might have | |
1035 | set in the startup code or in the dynamic linker itself. Proper | |
1036 | handling will probably have to wait until the implementation is | |
1037 | changed to use the "breakpoint handler function" method. | |
1038 | ||
1039 | Also, what if child has exit()ed? Must exit loop somehow. | |
1040 | */ | |
1041 | ||
1042 | void | |
1043 | solib_create_inferior_hook() | |
1044 | { | |
1045 | CORE_ADDR debug_addr; | |
1046 | int in_debugger; | |
1047 | CORE_ADDR in_debugger_addr; | |
1048 | CORE_ADDR breakpoint_addr; | |
1049 | int i, j; | |
1050 | ||
1051 | if ((debug_base = locate_base ()) == 0) | |
1052 | { | |
1053 | /* Can't find the symbol or the executable is statically linked. */ | |
1054 | return; | |
1055 | } | |
1056 | ||
1057 | if (!enable_break ()) | |
1058 | { | |
1059 | warning ("shared library handler failed to enable breakpoint"); | |
1060 | return; | |
1061 | } | |
1062 | ||
1063 | /* Now run the target. It will eventually hit the breakpoint, at | |
1064 | which point all of the libraries will have been mapped in and we | |
1065 | can go groveling around in the dynamic linker structures to find | |
1066 | out what we need to know about them. */ | |
bdbd5f50 JG |
1067 | |
1068 | clear_proceed_status (); | |
1069 | stop_soon_quietly = 1; | |
f8b76e70 FF |
1070 | stop_signal = 0; |
1071 | do | |
bdbd5f50 | 1072 | { |
bdbd5f50 JG |
1073 | target_resume (0, stop_signal); |
1074 | wait_for_inferior (); | |
1075 | } | |
f8b76e70 | 1076 | while (stop_signal != SIGTRAP); |
bdbd5f50 | 1077 | stop_soon_quietly = 0; |
f8b76e70 FF |
1078 | |
1079 | /* We are now either at the "mapping complete" breakpoint (or somewhere | |
1080 | else, a condition we aren't prepared to deal with anyway), so adjust | |
1081 | the PC as necessary after a breakpoint, disable the breakpoint, and | |
1082 | add any shared libraries that were mapped in. */ | |
bdbd5f50 | 1083 | |
f8b76e70 FF |
1084 | if (DECR_PC_AFTER_BREAK) |
1085 | { | |
1086 | stop_pc -= DECR_PC_AFTER_BREAK; | |
1087 | write_register (PC_REGNUM, stop_pc); | |
1088 | } | |
1089 | ||
1090 | if (!disable_break ()) | |
1091 | { | |
1092 | warning ("shared library handler failed to disable breakpoint"); | |
1093 | } | |
1094 | ||
1095 | solib_add ((char *) 0, 0, (struct target_ops *) 0); | |
bdbd5f50 JG |
1096 | } |
1097 | ||
f8b76e70 FF |
1098 | /* |
1099 | ||
1100 | GLOBAL FUNCTION | |
1101 | ||
1102 | sharedlibrary_command -- handle command to explicitly add library | |
1103 | ||
1104 | SYNOPSIS | |
1105 | ||
1106 | void sharedlibrary_command (char *args, int from_tty) | |
1107 | ||
1108 | DESCRIPTION | |
1109 | ||
1110 | */ | |
1111 | ||
bdbd5f50 JG |
1112 | void |
1113 | sharedlibrary_command (args, from_tty) | |
f8b76e70 FF |
1114 | char *args; |
1115 | int from_tty; | |
bdbd5f50 | 1116 | { |
f8b76e70 FF |
1117 | dont_repeat (); |
1118 | solib_add (args, from_tty, (struct target_ops *) 0); | |
bd5635a1 RP |
1119 | } |
1120 | ||
1121 | void | |
1122 | _initialize_solib() | |
1123 | { | |
f8b76e70 FF |
1124 | |
1125 | add_com ("sharedlibrary", class_files, sharedlibrary_command, | |
bd5635a1 | 1126 | "Load shared object library symbols for files matching REGEXP."); |
f8b76e70 FF |
1127 | add_info ("sharedlibrary", info_sharedlibrary_command, |
1128 | "Status of loaded shared object libraries."); | |
bd5635a1 | 1129 | } |