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> | |
f8b76e70 | 28 | |
bd5635a1 | 29 | #include "defs.h" |
bd5635a1 RP |
30 | #include "symtab.h" |
31 | #include "gdbcore.h" | |
32 | #include "command.h" | |
b3fdaf3d | 33 | #include "target.h" |
2403f49b | 34 | #include "frame.h" |
bdbd5f50 JG |
35 | #include "regex.h" |
36 | #include "inferior.h" | |
37 | ||
f8b76e70 FF |
38 | extern char *getenv (); |
39 | extern char *elf_interpreter (); /* Interpreter name from exec file */ | |
40 | extern char *re_comp (); | |
41 | ||
42 | #define MAX_PATH_SIZE 256 /* FIXME: Should be dynamic */ | |
43 | ||
44 | /* On SVR4 systems, for the initial implementation, use main() as the | |
45 | "startup mapping complete" breakpoint address. The models for SunOS | |
46 | and SVR4 dynamic linking debugger support are different in that SunOS | |
47 | hits one breakpoint when all mapping is complete while using the SVR4 | |
48 | debugger support takes two breakpoint hits for each file mapped, and | |
49 | there is no way to know when the "last" one is hit. Both these | |
50 | mechanisms should be tied to a "breakpoint service routine" that | |
51 | gets automatically executed whenever one of the breakpoints indicating | |
52 | a change in mapping is hit. This is a future enhancement. (FIXME) */ | |
53 | ||
54 | #define BKPT_AT_MAIN 1 | |
55 | ||
56 | /* local data declarations */ | |
57 | ||
58 | #ifdef sun | |
59 | ||
60 | #define DEBUG_BASE "_DYNAMIC" | |
61 | #define LM_ADDR(so) ((so) -> lm.lm_addr) | |
62 | #define LM_NEXT(so) ((so) -> lm.lm_next) | |
63 | #define LM_NAME(so) ((so) -> lm.lm_name) | |
64 | static struct link_dynamic dynamic_copy; | |
65 | static struct link_dynamic_2 ld_2_copy; | |
66 | static struct ld_debug debug_copy; | |
67 | static CORE_ADDR debug_addr; | |
68 | static CORE_ADDR flag_addr; | |
69 | ||
70 | #else /* !sun */ | |
71 | ||
72 | #define DEBUG_BASE "_r_debug" | |
73 | #define LM_ADDR(so) ((so) -> lm.l_addr) | |
74 | #define LM_NEXT(so) ((so) -> lm.l_next) | |
75 | #define LM_NAME(so) ((so) -> lm.l_name) | |
76 | static struct r_debug debug_copy; | |
77 | static CORE_ADDR shlib_base; /* Base address of shared library */ | |
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 | ||
82 | #endif /* sun */ | |
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 | ||
181 | /* | |
182 | ||
183 | LOCAL FUNCTION | |
184 | ||
185 | bfd_lookup_symbol -- lookup the value for a specific symbol | |
186 | ||
187 | SYNOPSIS | |
188 | ||
189 | CORE_ADDR bfd_lookup_symbol (bfd *abfd, char *symname) | |
190 | ||
191 | DESCRIPTION | |
192 | ||
193 | An expensive way to lookup the value of a single symbol for | |
194 | bfd's that are only temporary anyway. This is used by the | |
195 | shared library support to find the address of the debugger | |
196 | interface structures in the shared library. | |
197 | ||
198 | Note that 0 is specifically allowed as an error return (no | |
199 | such symbol). | |
200 | ||
201 | FIXME: See if there is a less "expensive" way of doing this. | |
202 | Also see if there is already another bfd or gdb function | |
203 | that specifically does this, and if so, use it. | |
204 | */ | |
205 | ||
206 | static CORE_ADDR | |
207 | DEFUN (bfd_lookup_symbol, (abfd, symname), | |
208 | bfd *abfd AND | |
209 | char *symname) | |
210 | { | |
211 | unsigned int storage_needed; | |
212 | asymbol *sym; | |
213 | asymbol **symbol_table; | |
214 | unsigned int number_of_symbols; | |
215 | unsigned int i; | |
216 | struct cleanup *back_to; | |
217 | CORE_ADDR symaddr = 0; | |
218 | enum misc_function_type mf_type; | |
219 | ||
220 | storage_needed = get_symtab_upper_bound (abfd); | |
221 | ||
222 | if (storage_needed > 0) | |
223 | { | |
224 | symbol_table = (asymbol **) bfd_xmalloc (storage_needed); | |
225 | back_to = make_cleanup (free, symbol_table); | |
226 | number_of_symbols = bfd_canonicalize_symtab (abfd, symbol_table); | |
227 | ||
228 | for (i = 0; i < number_of_symbols; i++) | |
d0237a54 | 229 | { |
f8b76e70 FF |
230 | sym = *symbol_table++; |
231 | if (strcmp (sym -> name, symname) == 0) | |
232 | { | |
233 | symaddr = sym -> value; | |
234 | break; | |
235 | } | |
d0237a54 | 236 | } |
f8b76e70 | 237 | do_cleanups (back_to); |
d0237a54 | 238 | } |
f8b76e70 | 239 | return (symaddr); |
d0237a54 JK |
240 | } |
241 | ||
f8b76e70 FF |
242 | /* |
243 | ||
244 | LOCAL FUNCTION | |
245 | ||
246 | locate_base -- locate the base address of dynamic linker structs | |
247 | ||
248 | SYNOPSIS | |
249 | ||
250 | CORE_ADDR locate_base (void) | |
251 | ||
252 | DESCRIPTION | |
253 | ||
254 | For both the SunOS and SVR4 shared library implementations, if the | |
255 | inferior executable has been linked dynamically, there is a single | |
256 | address somewhere in the inferior's data space which is the key to | |
257 | locating all of the dynamic linker's runtime structures, and this | |
258 | address is the value of the symbol defined by the macro DEBUG_BASE. | |
259 | The job of this function is to find and return that address, or to | |
260 | return 0 if there is no such address (the executable is statically | |
261 | linked for example). | |
262 | ||
263 | For SunOS, the job is almost trivial, since the dynamic linker and | |
264 | all of it's structures are statically linked to the executable at | |
265 | link time. Thus the symbol for the address we are looking for has | |
266 | already been added to the misc function vector at the time the symbol | |
267 | file's symbols were read. | |
268 | ||
269 | The SVR4 version is much more complicated because the dynamic linker | |
270 | and it's structures are located in the shared library itself, which | |
271 | gets run as the executable's "interpreter" by the kernel. Because | |
272 | of this complexity, we cache the value we find and return that value | |
273 | on subsequent invocations, if it is non-zero. | |
274 | ||
275 | First we must decide if we are stopped at the entry point of the | |
276 | shared C library, which is set to be the entry point of the dynamic | |
277 | linker code (the function _rt_boot() to be precise), or at the entry | |
278 | point given in the inferior's exec file (for statically linked | |
279 | executables). | |
280 | ||
281 | If we are not stopped at the inferior's exec file entry point then | |
282 | we are either stopped at the interpreter's entry point or somewhere | |
283 | else (I.E. totally lost). Use the /proc interface to get an open | |
284 | file descriptor on the file that is mapped at the current stop_pc | |
285 | value and try to open a bfd for it. | |
286 | ||
287 | FIXME | |
288 | ||
289 | The SVR4 strategy does NOT work when gdb is attaching to an existing | |
290 | process because the stop_pc is not in the library code, so we can't | |
291 | use the /proc interface to get an open fd for the library. So we | |
292 | need to rethink the method for finding the debugger interface struct. | |
293 | ||
294 | For SunOS we could look around in the executable code to find | |
295 | DEBUG_BASE, if it isn't in the symbol table. It's not that hard to | |
296 | find. Then we can debug stripped executables using shared library | |
297 | symbols. | |
298 | ||
299 | */ | |
300 | ||
301 | static CORE_ADDR | |
302 | locate_base () | |
303 | { | |
431df2eb | 304 | CORE_ADDR address = 0; |
f8b76e70 FF |
305 | |
306 | #ifdef sun | |
307 | ||
308 | int i; | |
309 | ||
310 | i = lookup_misc_func (DEBUG_BASE); | |
311 | if (i >= 0 && misc_function_vector[i].address != 0) | |
312 | { | |
313 | address = misc_function_vector[i].address; | |
314 | } | |
315 | ||
316 | #else /* !sun */ | |
317 | ||
318 | int stop_pc_fd; /* File descriptor for mapped file */ | |
319 | int interp_fd; /* File descriptor for interpreter */ | |
320 | char *interp_name; /* Name of interpreter */ | |
321 | char *full_interp_name; /* Full pathname of interpreter */ | |
322 | bfd *interp_bfd; | |
323 | CORE_ADDR interp_base; | |
324 | ||
325 | if (debug_base > 0) | |
326 | { | |
327 | /* We have a currently valid address, so avoid doing all the work | |
328 | again. */ | |
329 | return (debug_base); | |
330 | } | |
331 | if (bfd_get_start_address (exec_bfd) == stop_pc) | |
332 | { | |
333 | /* We are stopped at the entry point to the exec file, so there | |
334 | are no shared libs to deal with. */ | |
335 | return (0); | |
336 | } | |
337 | if ((stop_pc_fd = proc_address_to_fd (stop_pc)) < 0) | |
338 | { | |
339 | /* We are stopped at an address for which we can't seem to get an open | |
340 | file descriptor from the /proc interface. We should already have | |
341 | printed a suitable warning message. */ | |
342 | return (0); | |
343 | } | |
344 | if ((interp_name = elf_interpreter (exec_bfd)) == NULL) | |
345 | { | |
346 | /* There is no interpreter specified in the exec file, thus this is | |
347 | not a normal dynamically linked file. */ | |
348 | return (0); | |
349 | } | |
350 | if ((interp_fd = openp (getenv ("PATH"), 1, interp_name, O_RDONLY, 0, | |
351 | &full_interp_name)) < 0) | |
352 | { | |
353 | /* We can't find and open the interpreter. This is a problem. */ | |
354 | return (0); | |
355 | } | |
356 | if (!fdmatch (stop_pc_fd, interp_fd)) | |
357 | { | |
358 | /* The file for the mapped region is not the interpreter, something | |
359 | is strange... */ | |
360 | close (stop_pc_fd); | |
361 | close (interp_fd); | |
362 | free (full_interp_name); | |
363 | return (0); | |
364 | } | |
365 | interp_bfd = bfd_fdopenr (full_interp_name, NULL, interp_fd); | |
366 | if (!interp_bfd) | |
367 | { | |
368 | warning ("Could not open `%s' as an executable file: %s", | |
369 | full_interp_name, bfd_errmsg (bfd_error)); | |
370 | return (0); | |
371 | } | |
372 | if (!bfd_check_format (interp_bfd, bfd_object)) | |
373 | { | |
374 | warning ("\"%s\": not in executable format: %s.", | |
375 | full_interp_name, bfd_errmsg (bfd_error)); | |
376 | return (0); | |
377 | } | |
378 | ||
379 | /* Lookup the unrelocated value of the symbol that defines the location | |
380 | of the debugger interface structure for the dynamic linker in the shared | |
381 | library. Then find the base address of the text segment in the | |
382 | inferior's mapped in dynamic library, which gives the relocation to | |
383 | apply to find the actual mapped address of the debugger interface | |
384 | structure. */ | |
385 | ||
386 | if ((address = bfd_lookup_symbol (interp_bfd, DEBUG_BASE)) == 0) | |
387 | { | |
388 | warning ("can't find symbol %s in shared library", DEBUG_BASE); | |
389 | return (0); | |
390 | } | |
391 | if ((interp_base = proc_base_address (stop_pc)) == 0) | |
392 | { | |
393 | warning ("can't find base address for shared library text segment"); | |
394 | return (0); | |
395 | } | |
396 | shlib_base = interp_base; | |
397 | address += interp_base; | |
398 | ||
399 | if ((interp_base + bfd_get_start_address (interp_bfd)) != stop_pc) | |
400 | { | |
401 | /* We are not stopped at the entry point to the dynamic linker, | |
402 | so grumble and skip startup shared library processing. */ | |
403 | warning ("not stopped at entry point of dynamic linker"); | |
404 | warning ("shared library processing suppressed"); | |
405 | return (0); | |
406 | } | |
407 | ||
408 | bfd_close (interp_bfd); | |
409 | ||
410 | #endif /* sun */ | |
411 | ||
412 | return (address); | |
413 | ||
414 | } | |
bd5635a1 | 415 | |
f8b76e70 FF |
416 | static struct link_map * |
417 | first_link_map_member () | |
bd5635a1 | 418 | { |
f8b76e70 FF |
419 | struct link_map *lm = NULL; |
420 | ||
421 | #ifdef sun | |
422 | ||
423 | read_memory (debug_base, &dynamic_copy, sizeof (dynamic_copy)); | |
424 | if (dynamic_copy.ld_version >= 2) | |
425 | { | |
426 | /* It is a version that we can deal with, so read in the secondary | |
427 | structure and find the address of the link map list from it. */ | |
428 | read_memory ((CORE_ADDR) dynamic_copy.ld_un.ld_2, &ld_2_copy, | |
429 | sizeof (struct link_dynamic_2)); | |
430 | lm = ld_2_copy.ld_loaded; | |
431 | } | |
432 | ||
433 | #else | |
434 | ||
435 | read_memory (debug_base, &debug_copy, sizeof (struct r_debug)); | |
436 | lm = debug_copy.r_map; | |
437 | ||
d0237a54 JK |
438 | #endif |
439 | ||
f8b76e70 FF |
440 | return (lm); |
441 | } | |
442 | ||
443 | /* | |
444 | ||
445 | GLOBAL FUNCTION | |
446 | ||
447 | find_solib -- step through list of shared objects | |
448 | ||
449 | SYNOPSIS | |
450 | ||
451 | struct so_list *find_solib (struct so_list *so_list_ptr) | |
452 | ||
453 | DESCRIPTION | |
454 | ||
455 | This module contains the routine which finds the names of any | |
456 | loaded "images" in the current process. The argument in must be | |
457 | NULL on the first call, and then the returned value must be passed | |
458 | in on subsequent calls. This provides the capability to "step" down | |
459 | the list of loaded objects. On the last object, a NULL value is | |
460 | returned. | |
d0237a54 | 461 | |
f8b76e70 FF |
462 | The arg and return value are "struct link_map" pointers, as defined |
463 | in <link.h>. | |
464 | */ | |
d0237a54 | 465 | |
f8b76e70 FF |
466 | struct so_list * |
467 | find_solib (so_list_ptr) | |
468 | struct so_list *so_list_ptr; /* Last lm or NULL for first one */ | |
469 | { | |
470 | struct so_list *so_list_next = NULL; | |
471 | struct link_map *lm = NULL; | |
472 | struct so_list *new; | |
473 | ||
474 | if (so_list_ptr == NULL) | |
475 | { | |
476 | /* We are setting up for a new scan through the loaded images. */ | |
477 | if ((so_list_next = so_list_head) == NULL) | |
478 | { | |
479 | /* We have not already read in the dynamic linking structures | |
480 | from the inferior, lookup the address of the base structure. */ | |
481 | debug_base = locate_base (); | |
482 | if (debug_base > 0) | |
483 | { | |
484 | /* Read the base structure in and find the address of the first | |
485 | link map list member. */ | |
486 | lm = first_link_map_member (); | |
487 | } | |
488 | } | |
489 | } | |
490 | else | |
491 | { | |
492 | /* We have been called before, and are in the process of walking | |
493 | the shared library list. Advance to the next shared object. */ | |
494 | if ((lm = LM_NEXT (so_list_ptr)) == NULL) | |
495 | { | |
496 | /* We have hit the end of the list, so check to see if any were | |
497 | added, but be quiet if we can't read from the target any more. */ | |
498 | int status = target_read_memory ((CORE_ADDR) so_list_ptr -> lmaddr, | |
499 | (char *) &(so_list_ptr -> lm), | |
500 | sizeof (struct link_map)); | |
501 | if (status == 0) | |
502 | { | |
503 | lm = LM_NEXT (so_list_ptr); | |
504 | } | |
505 | else | |
506 | { | |
507 | lm = NULL; | |
508 | } | |
509 | } | |
510 | so_list_next = so_list_ptr -> next; | |
511 | } | |
512 | if ((so_list_next == NULL) && (lm != NULL)) | |
513 | { | |
514 | /* Get next link map structure from inferior image and build a local | |
515 | abbreviated load_map structure */ | |
516 | new = (struct so_list *) xmalloc (sizeof (struct so_list)); | |
517 | (void) memset ((char *) new, 0, sizeof (struct so_list)); | |
518 | new -> lmaddr = lm; | |
519 | /* Add the new node as the next node in the list, or as the root | |
520 | node if this is the first one. */ | |
521 | if (so_list_ptr != NULL) | |
522 | { | |
523 | so_list_ptr -> next = new; | |
524 | } | |
525 | else | |
526 | { | |
527 | so_list_head = new; | |
528 | } | |
529 | so_list_next = new; | |
530 | read_memory ((CORE_ADDR) lm, &(new -> lm), sizeof (struct link_map)); | |
531 | /* For the SVR4 version, there is one entry that has no name | |
532 | (for the inferior executable) since it is not a shared object. */ | |
533 | if (LM_NAME (new) != 0) | |
534 | { | |
535 | read_memory((CORE_ADDR) LM_NAME (new), new -> so_name, | |
536 | MAX_PATH_SIZE - 1); | |
537 | new -> so_name[MAX_PATH_SIZE - 1] = 0; | |
538 | solib_map_sections (new); | |
539 | } | |
540 | } | |
541 | return (so_list_next); | |
bd5635a1 | 542 | } |
d0237a54 | 543 | |
bdbd5f50 JG |
544 | /* A small stub to get us past the arg-passing pinhole of catch_errors. */ |
545 | ||
546 | static int | |
547 | symbol_add_stub (arg) | |
548 | char *arg; | |
d0237a54 | 549 | { |
f8b76e70 FF |
550 | register struct so_list *so = (struct so_list *) arg; /* catch_errs bogon */ |
551 | ||
552 | symbol_file_add (so -> so_name, so -> from_tty, | |
553 | (unsigned int) LM_ADDR (so), 0); | |
554 | return (1); | |
d0237a54 | 555 | } |
bd5635a1 | 556 | |
f8b76e70 FF |
557 | /* |
558 | ||
559 | GLOBAL FUNCTION | |
560 | ||
561 | solib_add -- add a shared library file to the symtab and section list | |
562 | ||
563 | SYNOPSIS | |
564 | ||
565 | void solib_add (char *arg_string, int from_tty, | |
566 | struct target_ops *target) | |
567 | ||
568 | DESCRIPTION | |
569 | ||
570 | */ | |
bdbd5f50 JG |
571 | |
572 | void | |
573 | solib_add (arg_string, from_tty, target) | |
574 | char *arg_string; | |
575 | int from_tty; | |
576 | struct target_ops *target; | |
bd5635a1 | 577 | { |
f8b76e70 FF |
578 | register struct so_list *so = NULL; /* link map state variable */ |
579 | char *re_err; | |
580 | int count; | |
581 | int old; | |
582 | ||
583 | if ((re_err = re_comp (arg_string ? arg_string : ".")) != NULL) | |
584 | { | |
585 | error ("Invalid regexp: %s", re_err); | |
586 | } | |
587 | ||
bdbd5f50 JG |
588 | /* Getting new symbols may change our opinion about what is |
589 | frameless. */ | |
590 | reinit_frame_cache (); | |
bdbd5f50 | 591 | |
f8b76e70 FF |
592 | while ((so = find_solib (so)) != NULL) |
593 | { | |
594 | if (so -> so_name[0] && re_exec (so -> so_name)) | |
595 | { | |
596 | if (so -> symbols_loaded) | |
597 | { | |
bdbd5f50 | 598 | if (from_tty) |
f8b76e70 FF |
599 | { |
600 | printf ("Symbols already loaded for %s\n", so -> so_name); | |
601 | } | |
602 | } | |
603 | else | |
604 | { | |
605 | so -> symbols_loaded = 1; | |
606 | so -> from_tty = from_tty; | |
607 | catch_errors (symbol_add_stub, (char *) so, | |
608 | "Error while reading shared library symbols:\n"); | |
609 | } | |
610 | } | |
611 | } | |
612 | ||
bdbd5f50 JG |
613 | /* Now add the shared library sections to the section table of the |
614 | specified target, if any. */ | |
f8b76e70 FF |
615 | if (target) |
616 | { | |
617 | /* Count how many new section_table entries there are. */ | |
618 | so = NULL; | |
619 | count = 0; | |
620 | while ((so = find_solib (so)) != NULL) | |
621 | { | |
622 | if (so -> so_name[0]) | |
623 | { | |
624 | count += so -> sections_end - so -> sections; | |
625 | } | |
626 | } | |
627 | ||
628 | if (count) | |
629 | { | |
630 | /* Reallocate the target's section table including the new size. */ | |
631 | if (target -> sections) | |
632 | { | |
633 | old = target -> sections_end - target -> sections; | |
634 | target -> sections = (struct section_table *) | |
635 | realloc ((char *)target -> sections, | |
636 | (sizeof (struct section_table)) * (count + old)); | |
637 | } | |
638 | else | |
639 | { | |
640 | old = 0; | |
641 | target -> sections = (struct section_table *) | |
642 | malloc ((sizeof (struct section_table)) * count); | |
643 | } | |
644 | target -> sections_end = target -> sections + (count + old); | |
645 | ||
646 | /* Add these section table entries to the target's table. */ | |
647 | while ((so = find_solib (so)) != NULL) | |
648 | { | |
649 | if (so -> so_name[0]) | |
650 | { | |
651 | count = so -> sections_end - so -> sections; | |
652 | bcopy (so -> sections, (char *)(target -> sections + old), | |
653 | (sizeof (struct section_table)) * count); | |
654 | old += count; | |
655 | } | |
656 | } | |
657 | } | |
658 | } | |
bd5635a1 | 659 | } |
bdbd5f50 | 660 | |
f8b76e70 | 661 | /* |
bd5635a1 | 662 | |
f8b76e70 FF |
663 | LOCAL FUNCTION |
664 | ||
665 | info_sharedlibrary_command -- code for "info sharedlibrary" | |
666 | ||
667 | SYNOPSIS | |
668 | ||
669 | static void info_sharedlibrary_command () | |
670 | ||
671 | DESCRIPTION | |
bd5635a1 | 672 | |
f8b76e70 FF |
673 | Walk through the shared library list and print information |
674 | about each attached library. | |
675 | */ | |
676 | ||
677 | static void | |
678 | info_sharedlibrary_command () | |
679 | { | |
680 | register struct so_list *so = NULL; /* link map state variable */ | |
681 | int header_done = 0; | |
682 | ||
683 | if (exec_bfd == NULL) | |
684 | { | |
685 | printf ("No exec file.\n"); | |
686 | return; | |
687 | } | |
688 | while ((so = find_solib (so)) != NULL) | |
689 | { | |
690 | if (so -> so_name[0]) | |
691 | { | |
692 | if (!header_done) | |
693 | { | |
694 | printf("%-12s%-12s%-12s%s\n", "From", "To", "Syms Read", | |
695 | "Shared Object Library"); | |
696 | header_done++; | |
697 | } | |
698 | printf ("%-12s", local_hex_string_custom (LM_ADDR (so), "08")); | |
699 | printf ("%-12s", local_hex_string_custom (so -> lmend, "08")); | |
700 | printf ("%-12s", so -> symbols_loaded ? "Yes" : "No"); | |
701 | printf ("%s\n", so -> so_name); | |
bd5635a1 | 702 | } |
bd5635a1 | 703 | } |
f8b76e70 FF |
704 | if (so_list_head == NULL) |
705 | { | |
706 | printf ("No shared libraries loaded at this time.\n"); | |
bd5635a1 RP |
707 | } |
708 | } | |
709 | ||
710 | /* | |
f8b76e70 FF |
711 | |
712 | GLOBAL FUNCTION | |
713 | ||
714 | solib_address -- check to see if an address is in a shared lib | |
715 | ||
716 | SYNOPSIS | |
717 | ||
718 | int solib_address (CORE_ADDR address) | |
719 | ||
720 | DESCRIPTION | |
721 | ||
722 | Provides a hook for other gdb routines to discover whether or | |
723 | not a particular address is within the mapped address space of | |
724 | a shared library. Any address between the base mapping address | |
725 | and the first address beyond the end of the last mapping, is | |
726 | considered to be within the shared library address space, for | |
727 | our purposes. | |
728 | ||
729 | For example, this routine is called at one point to disable | |
730 | breakpoints which are in shared libraries that are not currently | |
731 | mapped in. | |
732 | */ | |
733 | ||
bd5635a1 | 734 | int |
f8b76e70 | 735 | solib_address (address) |
bd5635a1 RP |
736 | CORE_ADDR address; |
737 | { | |
f8b76e70 FF |
738 | register struct so_list *so = 0; /* link map state variable */ |
739 | ||
740 | while ((so = find_solib (so)) != NULL) | |
741 | { | |
742 | if (so -> so_name[0]) | |
743 | { | |
744 | if ((address >= (CORE_ADDR) LM_ADDR (so)) && | |
745 | (address < (CORE_ADDR) so -> lmend)) | |
746 | { | |
747 | return (1); | |
748 | } | |
749 | } | |
750 | } | |
751 | return (0); | |
752 | } | |
753 | ||
754 | /* Called by free_all_symtabs */ | |
bd5635a1 | 755 | |
f8b76e70 FF |
756 | void |
757 | clear_solib() | |
758 | { | |
759 | struct so_list *next; | |
760 | ||
761 | while (so_list_head) | |
762 | { | |
763 | if (so_list_head -> sections) | |
764 | { | |
765 | free (so_list_head -> sections); | |
766 | } | |
767 | if (so_list_head -> so_bfd) | |
768 | { | |
769 | bfd_close (so_list_head -> so_bfd); | |
770 | } | |
771 | next = so_list_head -> next; | |
772 | free(so_list_head); | |
773 | so_list_head = next; | |
bd5635a1 | 774 | } |
f8b76e70 | 775 | debug_base = 0; |
bd5635a1 RP |
776 | } |
777 | ||
778 | /* | |
f8b76e70 FF |
779 | |
780 | LOCAL FUNCTION | |
781 | ||
782 | disable_break -- remove the "mapping changed" breakpoint | |
783 | ||
784 | SYNOPSIS | |
785 | ||
786 | static int disable_break () | |
787 | ||
788 | DESCRIPTION | |
789 | ||
790 | Removes the breakpoint that gets hit when the dynamic linker | |
791 | completes a mapping change. | |
792 | ||
bd5635a1 | 793 | */ |
f8b76e70 FF |
794 | |
795 | static int | |
796 | disable_break () | |
bd5635a1 | 797 | { |
f8b76e70 FF |
798 | int status = 1; |
799 | ||
800 | #ifdef sun | |
801 | ||
802 | /* FIXME: maybe we should add the common symbols from the ldd_cp chain | |
803 | to the misc_function_vector ? */ | |
804 | ||
805 | int in_debugger = 0; | |
806 | ||
807 | /* Set `in_debugger' to zero now. */ | |
808 | ||
809 | write_memory (flag_addr, &in_debugger, sizeof (in_debugger)); | |
810 | ||
811 | /* Read the debugger structure from the inferior to retrieve the | |
812 | address of the breakpoint and the original contents of the | |
813 | breakpoint address. Remove the breakpoint by writing the original | |
814 | contents back. */ | |
815 | ||
816 | read_memory (debug_addr, &debug_copy, sizeof (debug_copy)); | |
817 | breakpoint_addr = (CORE_ADDR) debug_copy.ldd_bp_addr; | |
818 | write_memory (breakpoint_addr, &debug_copy.ldd_bp_inst, | |
819 | sizeof (debug_copy.ldd_bp_inst)); | |
820 | ||
821 | #else /* !sun */ | |
822 | ||
823 | /* Note that breakpoint address and original contents are in our address | |
824 | space, so we just need to write the original contents back. */ | |
825 | ||
826 | if (memory_remove_breakpoint (breakpoint_addr, shadow_contents) != 0) | |
827 | { | |
828 | status = 0; | |
829 | } | |
830 | ||
831 | #endif /* sun */ | |
832 | ||
833 | /* For the SVR4 version, we always know the breakpoint address. For the | |
834 | SunOS version we don't know it until the above code is executed. | |
835 | Grumble if we are stopped anywhere besides the breakpoint address. */ | |
836 | ||
837 | if (stop_pc != breakpoint_addr) | |
838 | { | |
839 | warning ("stopped at unknown breakpoint while handling shared libraries"); | |
840 | } | |
841 | ||
842 | return (status); | |
bdbd5f50 JG |
843 | } |
844 | ||
f8b76e70 | 845 | /* |
bdbd5f50 | 846 | |
f8b76e70 FF |
847 | LOCAL FUNCTION |
848 | ||
849 | enable_break -- arrange for dynamic linker to hit breakpoint | |
850 | ||
851 | SYNOPSIS | |
852 | ||
853 | int enable_break (void) | |
854 | ||
855 | DESCRIPTION | |
856 | ||
857 | Both the SunOS and the SVR4 dynamic linkers have, as part of their | |
858 | debugger interface, support for arranging for the inferior to hit | |
859 | a breakpoint after mapping in the shared libraries. This function | |
860 | enables that breakpoint. | |
861 | ||
862 | For SunOS, there is a special flag location (in_debugger) which we | |
863 | set to 1. When the dynamic linker sees this flag set, it will set | |
864 | a breakpoint at a location known only to itself, after saving the | |
865 | original contents of that place and the breakpoint address itself, | |
866 | in it's own internal structures. When we resume the inferior, it | |
867 | will eventually take a SIGTRAP when it runs into the breakpoint. | |
868 | We handle this (in a different place) by restoring the contents of | |
869 | the breakpointed location (which is only known after it stops), | |
870 | chasing around to locate the shared libraries that have been | |
871 | loaded, then resuming. | |
872 | ||
873 | For SVR4, the debugger interface structure contains a member (r_brk) | |
874 | which is statically initialized at the time the shared library is | |
875 | built, to the offset of a function (_r_debug_state) which is guaran- | |
876 | teed to be called once before mapping in a library, and again when | |
877 | the mapping is complete. At the time we are examining this member, | |
878 | it contains only the unrelocated offset of the function, so we have | |
879 | to do our own relocation. Later, when the dynamic linker actually | |
880 | runs, it relocates r_brk to be the actual address of _r_debug_state(). | |
881 | ||
882 | The debugger interface structure also contains an enumeration which | |
883 | is set to either RT_ADD or RT_DELETE prior to changing the mapping, | |
884 | depending upon whether or not the library is being mapped or unmapped, | |
885 | and then set to RT_CONSISTENT after the library is mapped/unmapped. | |
886 | */ | |
887 | ||
888 | static int | |
889 | enable_break () | |
bdbd5f50 | 890 | { |
bdbd5f50 | 891 | |
f8b76e70 FF |
892 | int j; |
893 | ||
894 | #ifdef sun | |
bdbd5f50 | 895 | |
f8b76e70 FF |
896 | int in_debugger; |
897 | ||
bdbd5f50 | 898 | /* Get link_dynamic structure */ |
f8b76e70 FF |
899 | |
900 | j = target_read_memory (debug_base, (char *) &dynamic_copy, | |
901 | sizeof (dynamic_copy)); | |
902 | if (j) | |
903 | { | |
904 | /* unreadable */ | |
905 | return (0); | |
906 | } | |
06b6c733 | 907 | |
bdbd5f50 | 908 | /* Calc address of debugger interface structure */ |
f8b76e70 FF |
909 | |
910 | debug_addr = (CORE_ADDR) dynamic_copy.ldd; | |
911 | ||
bdbd5f50 | 912 | /* Calc address of `in_debugger' member of debugger interface structure */ |
f8b76e70 FF |
913 | |
914 | flag_addr = debug_addr + (CORE_ADDR) ((char *) &debug_copy.ldd_in_debugger - | |
915 | (char *) &debug_copy); | |
916 | ||
bdbd5f50 | 917 | /* Write a value of 1 to this member. */ |
f8b76e70 | 918 | |
bdbd5f50 | 919 | in_debugger = 1; |
bdbd5f50 | 920 | |
f8b76e70 FF |
921 | write_memory (flag_addr, &in_debugger, sizeof (in_debugger)); |
922 | ||
923 | #else /* !sun */ | |
924 | ||
925 | #ifdef BKPT_AT_MAIN | |
926 | ||
927 | int i; | |
928 | ||
929 | i = lookup_misc_func ("main"); | |
930 | if (i >= 0 && misc_function_vector[i].address != 0) | |
931 | { | |
932 | breakpoint_addr = misc_function_vector[i].address; | |
933 | } | |
934 | else | |
935 | { | |
936 | return (0); | |
937 | } | |
938 | ||
939 | if (target_insert_breakpoint (breakpoint_addr, shadow_contents) != 0) | |
940 | { | |
941 | return (0); | |
942 | } | |
943 | ||
944 | #else /* !BKPT_AT_MAIN */ | |
945 | ||
946 | struct symtab_and_line sal; | |
947 | ||
948 | /* Read the debugger interface structure directly. */ | |
949 | ||
950 | read_memory (debug_base, (char *) &debug_copy, sizeof (debug_copy)); | |
951 | ||
952 | /* Set breakpoint at the debugger interface stub routine that will | |
953 | be called just prior to each mapping change and again after the | |
954 | mapping change is complete. Set up the (nonexistent) handler to | |
955 | deal with hitting these breakpoints. (FIXME). */ | |
956 | ||
957 | warning ("'%s': line %d: missing SVR4 support code", __FILE__, __LINE__); | |
958 | ||
959 | #endif /* BKPT_AT_MAIN */ | |
960 | ||
961 | #endif /* sun */ | |
962 | ||
963 | return (1); | |
964 | } | |
965 | ||
966 | /* | |
967 | ||
968 | GLOBAL FUNCTION | |
969 | ||
970 | solib_create_inferior_hook -- shared library startup support | |
971 | ||
972 | SYNOPSIS | |
973 | ||
974 | void solib_create_inferior_hook() | |
975 | ||
976 | DESCRIPTION | |
977 | ||
978 | When gdb starts up the inferior, it nurses it along (through the | |
979 | shell) until it is ready to execute it's first instruction. At this | |
980 | point, this function gets called via expansion of the macro | |
981 | SOLIB_CREATE_INFERIOR_HOOK. | |
982 | ||
983 | For both SunOS shared libraries, and SVR4 shared libraries, we | |
984 | can arrange to cooperate with the dynamic linker to discover the | |
985 | names of shared libraries that are dynamically linked, and the | |
986 | base addresses to which they are linked. | |
987 | ||
988 | This function is responsible for discovering those names and | |
989 | addresses, and saving sufficient information about them to allow | |
990 | their symbols to be read at a later time. | |
991 | ||
992 | FIXME | |
993 | ||
994 | Between enable_break() and disable_break(), this code does not | |
995 | properly handle hitting breakpoints which the user might have | |
996 | set in the startup code or in the dynamic linker itself. Proper | |
997 | handling will probably have to wait until the implementation is | |
998 | changed to use the "breakpoint handler function" method. | |
999 | ||
1000 | Also, what if child has exit()ed? Must exit loop somehow. | |
1001 | */ | |
1002 | ||
1003 | void | |
1004 | solib_create_inferior_hook() | |
1005 | { | |
1006 | CORE_ADDR debug_addr; | |
1007 | int in_debugger; | |
1008 | CORE_ADDR in_debugger_addr; | |
1009 | CORE_ADDR breakpoint_addr; | |
1010 | int i, j; | |
1011 | ||
1012 | if ((debug_base = locate_base ()) == 0) | |
1013 | { | |
1014 | /* Can't find the symbol or the executable is statically linked. */ | |
1015 | return; | |
1016 | } | |
1017 | ||
1018 | if (!enable_break ()) | |
1019 | { | |
1020 | warning ("shared library handler failed to enable breakpoint"); | |
1021 | return; | |
1022 | } | |
1023 | ||
1024 | /* Now run the target. It will eventually hit the breakpoint, at | |
1025 | which point all of the libraries will have been mapped in and we | |
1026 | can go groveling around in the dynamic linker structures to find | |
1027 | out what we need to know about them. */ | |
bdbd5f50 JG |
1028 | |
1029 | clear_proceed_status (); | |
1030 | stop_soon_quietly = 1; | |
f8b76e70 FF |
1031 | stop_signal = 0; |
1032 | do | |
bdbd5f50 | 1033 | { |
bdbd5f50 JG |
1034 | target_resume (0, stop_signal); |
1035 | wait_for_inferior (); | |
1036 | } | |
f8b76e70 | 1037 | while (stop_signal != SIGTRAP); |
bdbd5f50 | 1038 | stop_soon_quietly = 0; |
f8b76e70 FF |
1039 | |
1040 | /* We are now either at the "mapping complete" breakpoint (or somewhere | |
1041 | else, a condition we aren't prepared to deal with anyway), so adjust | |
1042 | the PC as necessary after a breakpoint, disable the breakpoint, and | |
1043 | add any shared libraries that were mapped in. */ | |
bdbd5f50 | 1044 | |
f8b76e70 FF |
1045 | if (DECR_PC_AFTER_BREAK) |
1046 | { | |
1047 | stop_pc -= DECR_PC_AFTER_BREAK; | |
1048 | write_register (PC_REGNUM, stop_pc); | |
1049 | } | |
1050 | ||
1051 | if (!disable_break ()) | |
1052 | { | |
1053 | warning ("shared library handler failed to disable breakpoint"); | |
1054 | } | |
1055 | ||
1056 | solib_add ((char *) 0, 0, (struct target_ops *) 0); | |
bdbd5f50 JG |
1057 | } |
1058 | ||
f8b76e70 FF |
1059 | /* |
1060 | ||
1061 | GLOBAL FUNCTION | |
1062 | ||
1063 | sharedlibrary_command -- handle command to explicitly add library | |
1064 | ||
1065 | SYNOPSIS | |
1066 | ||
1067 | void sharedlibrary_command (char *args, int from_tty) | |
1068 | ||
1069 | DESCRIPTION | |
1070 | ||
1071 | */ | |
1072 | ||
bdbd5f50 JG |
1073 | void |
1074 | sharedlibrary_command (args, from_tty) | |
f8b76e70 FF |
1075 | char *args; |
1076 | int from_tty; | |
bdbd5f50 | 1077 | { |
f8b76e70 FF |
1078 | dont_repeat (); |
1079 | solib_add (args, from_tty, (struct target_ops *) 0); | |
bd5635a1 RP |
1080 | } |
1081 | ||
1082 | void | |
1083 | _initialize_solib() | |
1084 | { | |
f8b76e70 FF |
1085 | |
1086 | add_com ("sharedlibrary", class_files, sharedlibrary_command, | |
bd5635a1 | 1087 | "Load shared object library symbols for files matching REGEXP."); |
f8b76e70 FF |
1088 | add_info ("sharedlibrary", info_sharedlibrary_command, |
1089 | "Status of loaded shared object libraries."); | |
bd5635a1 | 1090 | } |