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1 | /* Work with executable files, for GDB. | |
2 | ||
3 | Copyright (C) 1988-2003, 2007-2012 Free Software Foundation, Inc. | |
4 | ||
5 | This file is part of GDB. | |
6 | ||
7 | This program is free software; you can redistribute it and/or modify | |
8 | it under the terms of the GNU General Public License as published by | |
9 | the Free Software Foundation; either version 3 of the License, or | |
10 | (at your option) any later version. | |
11 | ||
12 | This program is distributed in the hope that it will be useful, | |
13 | but WITHOUT ANY WARRANTY; without even the implied warranty of | |
14 | MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the | |
15 | GNU General Public License for more details. | |
16 | ||
17 | You should have received a copy of the GNU General Public License | |
18 | along with this program. If not, see <http://www.gnu.org/licenses/>. */ | |
19 | ||
20 | #include "defs.h" | |
21 | #include "frame.h" | |
22 | #include "inferior.h" | |
23 | #include "target.h" | |
24 | #include "gdbcmd.h" | |
25 | #include "language.h" | |
26 | #include "filenames.h" | |
27 | #include "symfile.h" | |
28 | #include "objfiles.h" | |
29 | #include "completer.h" | |
30 | #include "value.h" | |
31 | #include "exec.h" | |
32 | #include "observer.h" | |
33 | #include "arch-utils.h" | |
34 | #include "gdbthread.h" | |
35 | #include "progspace.h" | |
36 | ||
37 | #include <fcntl.h> | |
38 | #include "readline/readline.h" | |
39 | #include "gdb_string.h" | |
40 | ||
41 | #include "gdbcore.h" | |
42 | ||
43 | #include <ctype.h> | |
44 | #include "gdb_stat.h" | |
45 | ||
46 | #include "xcoffsolib.h" | |
47 | ||
48 | struct vmap *map_vmap (bfd *, bfd *); | |
49 | ||
50 | void (*deprecated_file_changed_hook) (char *); | |
51 | ||
52 | /* Prototypes for local functions */ | |
53 | ||
54 | static void file_command (char *, int); | |
55 | ||
56 | static void set_section_command (char *, int); | |
57 | ||
58 | static void exec_files_info (struct target_ops *); | |
59 | ||
60 | static void init_exec_ops (void); | |
61 | ||
62 | void _initialize_exec (void); | |
63 | ||
64 | /* The target vector for executable files. */ | |
65 | ||
66 | struct target_ops exec_ops; | |
67 | ||
68 | /* True if the exec target is pushed on the stack. */ | |
69 | static int using_exec_ops; | |
70 | ||
71 | /* Whether to open exec and core files read-only or read-write. */ | |
72 | ||
73 | int write_files = 0; | |
74 | static void | |
75 | show_write_files (struct ui_file *file, int from_tty, | |
76 | struct cmd_list_element *c, const char *value) | |
77 | { | |
78 | fprintf_filtered (file, _("Writing into executable and core files is %s.\n"), | |
79 | value); | |
80 | } | |
81 | ||
82 | ||
83 | struct vmap *vmap; | |
84 | ||
85 | static void | |
86 | exec_open (char *args, int from_tty) | |
87 | { | |
88 | target_preopen (from_tty); | |
89 | exec_file_attach (args, from_tty); | |
90 | } | |
91 | ||
92 | /* Close and clear exec_bfd. If we end up with no target sections to | |
93 | read memory from, this unpushes the exec_ops target. */ | |
94 | ||
95 | void | |
96 | exec_close (void) | |
97 | { | |
98 | if (exec_bfd) | |
99 | { | |
100 | bfd *abfd = exec_bfd; | |
101 | char *name = bfd_get_filename (abfd); | |
102 | ||
103 | gdb_bfd_close_or_warn (abfd); | |
104 | xfree (name); | |
105 | ||
106 | /* Removing target sections may close the exec_ops target. | |
107 | Clear exec_bfd before doing so to prevent recursion. */ | |
108 | exec_bfd = NULL; | |
109 | exec_bfd_mtime = 0; | |
110 | ||
111 | remove_target_sections (abfd); | |
112 | } | |
113 | } | |
114 | ||
115 | /* This is the target_close implementation. Clears all target | |
116 | sections and closes all executable bfds from all program spaces. */ | |
117 | ||
118 | static void | |
119 | exec_close_1 (int quitting) | |
120 | { | |
121 | int need_symtab_cleanup = 0; | |
122 | struct vmap *vp, *nxt; | |
123 | ||
124 | using_exec_ops = 0; | |
125 | ||
126 | for (nxt = vmap; nxt != NULL;) | |
127 | { | |
128 | vp = nxt; | |
129 | nxt = vp->nxt; | |
130 | ||
131 | /* if there is an objfile associated with this bfd, | |
132 | free_objfile() will do proper cleanup of objfile *and* bfd. */ | |
133 | ||
134 | if (vp->objfile) | |
135 | { | |
136 | free_objfile (vp->objfile); | |
137 | need_symtab_cleanup = 1; | |
138 | } | |
139 | else if (vp->bfd != exec_bfd) | |
140 | /* FIXME-leak: We should be freeing vp->name too, I think. */ | |
141 | gdb_bfd_close_or_warn (vp->bfd); | |
142 | ||
143 | xfree (vp); | |
144 | } | |
145 | ||
146 | vmap = NULL; | |
147 | ||
148 | { | |
149 | struct program_space *ss; | |
150 | struct cleanup *old_chain; | |
151 | ||
152 | old_chain = save_current_program_space (); | |
153 | ALL_PSPACES (ss) | |
154 | { | |
155 | set_current_program_space (ss); | |
156 | ||
157 | /* Delete all target sections. */ | |
158 | resize_section_table | |
159 | (current_target_sections, | |
160 | -resize_section_table (current_target_sections, 0)); | |
161 | ||
162 | exec_close (); | |
163 | } | |
164 | ||
165 | do_cleanups (old_chain); | |
166 | } | |
167 | } | |
168 | ||
169 | void | |
170 | exec_file_clear (int from_tty) | |
171 | { | |
172 | /* Remove exec file. */ | |
173 | exec_close (); | |
174 | ||
175 | if (from_tty) | |
176 | printf_unfiltered (_("No executable file now.\n")); | |
177 | } | |
178 | ||
179 | /* Set FILENAME as the new exec file. | |
180 | ||
181 | This function is intended to be behave essentially the same | |
182 | as exec_file_command, except that the latter will detect when | |
183 | a target is being debugged, and will ask the user whether it | |
184 | should be shut down first. (If the answer is "no", then the | |
185 | new file is ignored.) | |
186 | ||
187 | This file is used by exec_file_command, to do the work of opening | |
188 | and processing the exec file after any prompting has happened. | |
189 | ||
190 | And, it is used by child_attach, when the attach command was | |
191 | given a pid but not a exec pathname, and the attach command could | |
192 | figure out the pathname from the pid. (In this case, we shouldn't | |
193 | ask the user whether the current target should be shut down -- | |
194 | we're supplying the exec pathname late for good reason.) */ | |
195 | ||
196 | void | |
197 | exec_file_attach (char *filename, int from_tty) | |
198 | { | |
199 | /* Remove any previous exec file. */ | |
200 | exec_close (); | |
201 | ||
202 | /* Now open and digest the file the user requested, if any. */ | |
203 | ||
204 | if (!filename) | |
205 | { | |
206 | if (from_tty) | |
207 | printf_unfiltered (_("No executable file now.\n")); | |
208 | ||
209 | set_gdbarch_from_file (NULL); | |
210 | } | |
211 | else | |
212 | { | |
213 | struct cleanup *cleanups; | |
214 | char *scratch_pathname; | |
215 | int scratch_chan; | |
216 | struct target_section *sections = NULL, *sections_end = NULL; | |
217 | char **matching; | |
218 | ||
219 | scratch_chan = openp (getenv ("PATH"), OPF_TRY_CWD_FIRST, filename, | |
220 | write_files ? O_RDWR | O_BINARY : O_RDONLY | O_BINARY, | |
221 | &scratch_pathname); | |
222 | #if defined(__GO32__) || defined(_WIN32) || defined(__CYGWIN__) | |
223 | if (scratch_chan < 0) | |
224 | { | |
225 | char *exename = alloca (strlen (filename) + 5); | |
226 | ||
227 | strcat (strcpy (exename, filename), ".exe"); | |
228 | scratch_chan = openp (getenv ("PATH"), OPF_TRY_CWD_FIRST, exename, | |
229 | write_files ? O_RDWR | O_BINARY : O_RDONLY | O_BINARY, | |
230 | &scratch_pathname); | |
231 | } | |
232 | #endif | |
233 | if (scratch_chan < 0) | |
234 | perror_with_name (filename); | |
235 | exec_bfd = bfd_fopen (scratch_pathname, gnutarget, | |
236 | write_files ? FOPEN_RUB : FOPEN_RB, | |
237 | scratch_chan); | |
238 | ||
239 | if (!exec_bfd) | |
240 | { | |
241 | close (scratch_chan); | |
242 | error (_("\"%s\": could not open as an executable file: %s"), | |
243 | scratch_pathname, bfd_errmsg (bfd_get_error ())); | |
244 | } | |
245 | ||
246 | /* At this point, scratch_pathname and exec_bfd->name both point to the | |
247 | same malloc'd string. However exec_close() will attempt to free it | |
248 | via the exec_bfd->name pointer, so we need to make another copy and | |
249 | leave exec_bfd as the new owner of the original copy. */ | |
250 | scratch_pathname = xstrdup (scratch_pathname); | |
251 | cleanups = make_cleanup (xfree, scratch_pathname); | |
252 | ||
253 | if (!bfd_check_format_matches (exec_bfd, bfd_object, &matching)) | |
254 | { | |
255 | /* Make sure to close exec_bfd, or else "run" might try to use | |
256 | it. */ | |
257 | exec_close (); | |
258 | error (_("\"%s\": not in executable format: %s"), | |
259 | scratch_pathname, | |
260 | gdb_bfd_errmsg (bfd_get_error (), matching)); | |
261 | } | |
262 | ||
263 | /* FIXME - This should only be run for RS6000, but the ifdef is a poor | |
264 | way to accomplish. */ | |
265 | #ifdef DEPRECATED_IBM6000_TARGET | |
266 | /* Setup initial vmap. */ | |
267 | ||
268 | map_vmap (exec_bfd, 0); | |
269 | if (vmap == NULL) | |
270 | { | |
271 | /* Make sure to close exec_bfd, or else "run" might try to use | |
272 | it. */ | |
273 | exec_close (); | |
274 | error (_("\"%s\": can't find the file sections: %s"), | |
275 | scratch_pathname, bfd_errmsg (bfd_get_error ())); | |
276 | } | |
277 | #endif /* DEPRECATED_IBM6000_TARGET */ | |
278 | ||
279 | if (build_section_table (exec_bfd, §ions, §ions_end)) | |
280 | { | |
281 | /* Make sure to close exec_bfd, or else "run" might try to use | |
282 | it. */ | |
283 | exec_close (); | |
284 | error (_("\"%s\": can't find the file sections: %s"), | |
285 | scratch_pathname, bfd_errmsg (bfd_get_error ())); | |
286 | } | |
287 | ||
288 | exec_bfd_mtime = bfd_get_mtime (exec_bfd); | |
289 | ||
290 | validate_files (); | |
291 | ||
292 | set_gdbarch_from_file (exec_bfd); | |
293 | ||
294 | /* Add the executable's sections to the current address spaces' | |
295 | list of sections. This possibly pushes the exec_ops | |
296 | target. */ | |
297 | add_target_sections (sections, sections_end); | |
298 | xfree (sections); | |
299 | ||
300 | /* Tell display code (if any) about the changed file name. */ | |
301 | if (deprecated_exec_file_display_hook) | |
302 | (*deprecated_exec_file_display_hook) (filename); | |
303 | ||
304 | do_cleanups (cleanups); | |
305 | } | |
306 | bfd_cache_close_all (); | |
307 | observer_notify_executable_changed (); | |
308 | } | |
309 | ||
310 | /* Process the first arg in ARGS as the new exec file. | |
311 | ||
312 | Note that we have to explicitly ignore additional args, since we can | |
313 | be called from file_command(), which also calls symbol_file_command() | |
314 | which can take multiple args. | |
315 | ||
316 | If ARGS is NULL, we just want to close the exec file. */ | |
317 | ||
318 | static void | |
319 | exec_file_command (char *args, int from_tty) | |
320 | { | |
321 | char **argv; | |
322 | char *filename; | |
323 | ||
324 | if (from_tty && target_has_execution | |
325 | && !query (_("A program is being debugged already.\n" | |
326 | "Are you sure you want to change the file? "))) | |
327 | error (_("File not changed.")); | |
328 | ||
329 | if (args) | |
330 | { | |
331 | struct cleanup *cleanups; | |
332 | ||
333 | /* Scan through the args and pick up the first non option arg | |
334 | as the filename. */ | |
335 | ||
336 | argv = gdb_buildargv (args); | |
337 | cleanups = make_cleanup_freeargv (argv); | |
338 | ||
339 | for (; (*argv != NULL) && (**argv == '-'); argv++) | |
340 | {; | |
341 | } | |
342 | if (*argv == NULL) | |
343 | error (_("No executable file name was specified")); | |
344 | ||
345 | filename = tilde_expand (*argv); | |
346 | make_cleanup (xfree, filename); | |
347 | exec_file_attach (filename, from_tty); | |
348 | ||
349 | do_cleanups (cleanups); | |
350 | } | |
351 | else | |
352 | exec_file_attach (NULL, from_tty); | |
353 | } | |
354 | ||
355 | /* Set both the exec file and the symbol file, in one command. | |
356 | What a novelty. Why did GDB go through four major releases before this | |
357 | command was added? */ | |
358 | ||
359 | static void | |
360 | file_command (char *arg, int from_tty) | |
361 | { | |
362 | /* FIXME, if we lose on reading the symbol file, we should revert | |
363 | the exec file, but that's rough. */ | |
364 | exec_file_command (arg, from_tty); | |
365 | symbol_file_command (arg, from_tty); | |
366 | if (deprecated_file_changed_hook) | |
367 | deprecated_file_changed_hook (arg); | |
368 | } | |
369 | \f | |
370 | ||
371 | /* Locate all mappable sections of a BFD file. | |
372 | table_pp_char is a char * to get it through bfd_map_over_sections; | |
373 | we cast it back to its proper type. */ | |
374 | ||
375 | static void | |
376 | add_to_section_table (bfd *abfd, struct bfd_section *asect, | |
377 | void *table_pp_char) | |
378 | { | |
379 | struct target_section **table_pp = (struct target_section **) table_pp_char; | |
380 | flagword aflag; | |
381 | ||
382 | /* Check the section flags, but do not discard zero-length sections, since | |
383 | some symbols may still be attached to this section. For instance, we | |
384 | encountered on sparc-solaris 2.10 a shared library with an empty .bss | |
385 | section to which a symbol named "_end" was attached. The address | |
386 | of this symbol still needs to be relocated. */ | |
387 | aflag = bfd_get_section_flags (abfd, asect); | |
388 | if (!(aflag & SEC_ALLOC)) | |
389 | return; | |
390 | ||
391 | (*table_pp)->bfd = abfd; | |
392 | (*table_pp)->the_bfd_section = asect; | |
393 | (*table_pp)->addr = bfd_section_vma (abfd, asect); | |
394 | (*table_pp)->endaddr = (*table_pp)->addr + bfd_section_size (abfd, asect); | |
395 | (*table_pp)++; | |
396 | } | |
397 | ||
398 | int | |
399 | resize_section_table (struct target_section_table *table, int num_added) | |
400 | { | |
401 | struct target_section *old_value; | |
402 | int old_count; | |
403 | int new_count; | |
404 | ||
405 | old_value = table->sections; | |
406 | old_count = table->sections_end - table->sections; | |
407 | ||
408 | new_count = num_added + old_count; | |
409 | ||
410 | if (new_count) | |
411 | { | |
412 | table->sections = xrealloc (table->sections, | |
413 | sizeof (struct target_section) * new_count); | |
414 | table->sections_end = table->sections + new_count; | |
415 | } | |
416 | else | |
417 | { | |
418 | xfree (table->sections); | |
419 | table->sections = table->sections_end = NULL; | |
420 | } | |
421 | ||
422 | return old_count; | |
423 | } | |
424 | ||
425 | /* Builds a section table, given args BFD, SECTABLE_PTR, SECEND_PTR. | |
426 | Returns 0 if OK, 1 on error. */ | |
427 | ||
428 | int | |
429 | build_section_table (struct bfd *some_bfd, struct target_section **start, | |
430 | struct target_section **end) | |
431 | { | |
432 | unsigned count; | |
433 | ||
434 | count = bfd_count_sections (some_bfd); | |
435 | if (*start) | |
436 | xfree (* start); | |
437 | *start = (struct target_section *) xmalloc (count * sizeof (**start)); | |
438 | *end = *start; | |
439 | bfd_map_over_sections (some_bfd, add_to_section_table, (char *) end); | |
440 | if (*end > *start + count) | |
441 | internal_error (__FILE__, __LINE__, | |
442 | _("failed internal consistency check")); | |
443 | /* We could realloc the table, but it probably loses for most files. */ | |
444 | return 0; | |
445 | } | |
446 | ||
447 | /* Add the sections array defined by [SECTIONS..SECTIONS_END[ to the | |
448 | current set of target sections. */ | |
449 | ||
450 | void | |
451 | add_target_sections (struct target_section *sections, | |
452 | struct target_section *sections_end) | |
453 | { | |
454 | int count; | |
455 | struct target_section_table *table = current_target_sections; | |
456 | ||
457 | count = sections_end - sections; | |
458 | ||
459 | if (count > 0) | |
460 | { | |
461 | int space = resize_section_table (table, count); | |
462 | ||
463 | memcpy (table->sections + space, | |
464 | sections, count * sizeof (sections[0])); | |
465 | ||
466 | /* If these are the first file sections we can provide memory | |
467 | from, push the file_stratum target. */ | |
468 | if (!using_exec_ops) | |
469 | { | |
470 | using_exec_ops = 1; | |
471 | push_target (&exec_ops); | |
472 | } | |
473 | } | |
474 | } | |
475 | ||
476 | /* Remove all target sections taken from ABFD. */ | |
477 | ||
478 | void | |
479 | remove_target_sections (bfd *abfd) | |
480 | { | |
481 | struct target_section *src, *dest; | |
482 | struct target_section_table *table = current_target_sections; | |
483 | ||
484 | dest = table->sections; | |
485 | for (src = table->sections; src < table->sections_end; src++) | |
486 | if (src->bfd != abfd) | |
487 | { | |
488 | /* Keep this section. */ | |
489 | if (dest < src) | |
490 | *dest = *src; | |
491 | dest++; | |
492 | } | |
493 | ||
494 | /* If we've dropped any sections, resize the section table. */ | |
495 | if (dest < src) | |
496 | { | |
497 | int old_count; | |
498 | ||
499 | old_count = resize_section_table (table, dest - src); | |
500 | ||
501 | /* If we don't have any more sections to read memory from, | |
502 | remove the file_stratum target from the stack. */ | |
503 | if (old_count + (dest - src) == 0) | |
504 | { | |
505 | struct program_space *pspace; | |
506 | ||
507 | ALL_PSPACES (pspace) | |
508 | if (pspace->target_sections.sections | |
509 | != pspace->target_sections.sections_end) | |
510 | return; | |
511 | ||
512 | unpush_target (&exec_ops); | |
513 | } | |
514 | } | |
515 | } | |
516 | ||
517 | \f | |
518 | static void | |
519 | bfdsec_to_vmap (struct bfd *abfd, struct bfd_section *sect, void *arg3) | |
520 | { | |
521 | struct vmap_and_bfd *vmap_bfd = (struct vmap_and_bfd *) arg3; | |
522 | struct vmap *vp; | |
523 | ||
524 | vp = vmap_bfd->pvmap; | |
525 | ||
526 | if ((bfd_get_section_flags (abfd, sect) & SEC_LOAD) == 0) | |
527 | return; | |
528 | ||
529 | if (strcmp (bfd_section_name (abfd, sect), ".text") == 0) | |
530 | { | |
531 | vp->tstart = bfd_section_vma (abfd, sect); | |
532 | vp->tend = vp->tstart + bfd_section_size (abfd, sect); | |
533 | vp->tvma = bfd_section_vma (abfd, sect); | |
534 | vp->toffs = sect->filepos; | |
535 | } | |
536 | else if (strcmp (bfd_section_name (abfd, sect), ".data") == 0) | |
537 | { | |
538 | vp->dstart = bfd_section_vma (abfd, sect); | |
539 | vp->dend = vp->dstart + bfd_section_size (abfd, sect); | |
540 | vp->dvma = bfd_section_vma (abfd, sect); | |
541 | } | |
542 | /* Silently ignore other types of sections. (FIXME?) */ | |
543 | } | |
544 | ||
545 | /* Make a vmap for ABFD which might be a member of the archive ARCH. | |
546 | Return the new vmap. */ | |
547 | ||
548 | struct vmap * | |
549 | map_vmap (bfd *abfd, bfd *arch) | |
550 | { | |
551 | struct vmap_and_bfd vmap_bfd; | |
552 | struct vmap *vp, **vpp; | |
553 | ||
554 | vp = (struct vmap *) xmalloc (sizeof (*vp)); | |
555 | memset ((char *) vp, '\0', sizeof (*vp)); | |
556 | vp->nxt = 0; | |
557 | vp->bfd = abfd; | |
558 | vp->name = bfd_get_filename (arch ? arch : abfd); | |
559 | vp->member = arch ? bfd_get_filename (abfd) : ""; | |
560 | ||
561 | vmap_bfd.pbfd = arch; | |
562 | vmap_bfd.pvmap = vp; | |
563 | bfd_map_over_sections (abfd, bfdsec_to_vmap, &vmap_bfd); | |
564 | ||
565 | /* Find the end of the list and append. */ | |
566 | for (vpp = &vmap; *vpp; vpp = &(*vpp)->nxt) | |
567 | ; | |
568 | *vpp = vp; | |
569 | ||
570 | return vp; | |
571 | } | |
572 | \f | |
573 | ||
574 | VEC(mem_range_s) * | |
575 | section_table_available_memory (VEC(mem_range_s) *memory, | |
576 | CORE_ADDR memaddr, ULONGEST len, | |
577 | struct target_section *sections, | |
578 | struct target_section *sections_end) | |
579 | { | |
580 | struct target_section *p; | |
581 | ||
582 | for (p = sections; p < sections_end; p++) | |
583 | { | |
584 | if ((bfd_get_section_flags (p->bfd, p->the_bfd_section) | |
585 | & SEC_READONLY) == 0) | |
586 | continue; | |
587 | ||
588 | /* Copy the meta-data, adjusted. */ | |
589 | if (mem_ranges_overlap (p->addr, p->endaddr - p->addr, memaddr, len)) | |
590 | { | |
591 | ULONGEST lo1, hi1, lo2, hi2; | |
592 | struct mem_range *r; | |
593 | ||
594 | lo1 = memaddr; | |
595 | hi1 = memaddr + len; | |
596 | ||
597 | lo2 = p->addr; | |
598 | hi2 = p->endaddr; | |
599 | ||
600 | r = VEC_safe_push (mem_range_s, memory, NULL); | |
601 | ||
602 | r->start = max (lo1, lo2); | |
603 | r->length = min (hi1, hi2) - r->start; | |
604 | } | |
605 | } | |
606 | ||
607 | return memory; | |
608 | } | |
609 | ||
610 | int | |
611 | section_table_xfer_memory_partial (gdb_byte *readbuf, const gdb_byte *writebuf, | |
612 | ULONGEST offset, LONGEST len, | |
613 | struct target_section *sections, | |
614 | struct target_section *sections_end, | |
615 | const char *section_name) | |
616 | { | |
617 | int res; | |
618 | struct target_section *p; | |
619 | ULONGEST memaddr = offset; | |
620 | ULONGEST memend = memaddr + len; | |
621 | ||
622 | if (len <= 0) | |
623 | internal_error (__FILE__, __LINE__, | |
624 | _("failed internal consistency check")); | |
625 | ||
626 | for (p = sections; p < sections_end; p++) | |
627 | { | |
628 | if (section_name && strcmp (section_name, p->the_bfd_section->name) != 0) | |
629 | continue; /* not the section we need. */ | |
630 | if (memaddr >= p->addr) | |
631 | { | |
632 | if (memend <= p->endaddr) | |
633 | { | |
634 | /* Entire transfer is within this section. */ | |
635 | if (writebuf) | |
636 | res = bfd_set_section_contents (p->bfd, p->the_bfd_section, | |
637 | writebuf, memaddr - p->addr, | |
638 | len); | |
639 | else | |
640 | res = bfd_get_section_contents (p->bfd, p->the_bfd_section, | |
641 | readbuf, memaddr - p->addr, | |
642 | len); | |
643 | return (res != 0) ? len : 0; | |
644 | } | |
645 | else if (memaddr >= p->endaddr) | |
646 | { | |
647 | /* This section ends before the transfer starts. */ | |
648 | continue; | |
649 | } | |
650 | else | |
651 | { | |
652 | /* This section overlaps the transfer. Just do half. */ | |
653 | len = p->endaddr - memaddr; | |
654 | if (writebuf) | |
655 | res = bfd_set_section_contents (p->bfd, p->the_bfd_section, | |
656 | writebuf, memaddr - p->addr, | |
657 | len); | |
658 | else | |
659 | res = bfd_get_section_contents (p->bfd, p->the_bfd_section, | |
660 | readbuf, memaddr - p->addr, | |
661 | len); | |
662 | return (res != 0) ? len : 0; | |
663 | } | |
664 | } | |
665 | } | |
666 | ||
667 | return 0; /* We can't help. */ | |
668 | } | |
669 | ||
670 | struct target_section_table * | |
671 | exec_get_section_table (struct target_ops *ops) | |
672 | { | |
673 | return current_target_sections; | |
674 | } | |
675 | ||
676 | static LONGEST | |
677 | exec_xfer_partial (struct target_ops *ops, enum target_object object, | |
678 | const char *annex, gdb_byte *readbuf, | |
679 | const gdb_byte *writebuf, | |
680 | ULONGEST offset, LONGEST len) | |
681 | { | |
682 | struct target_section_table *table = target_get_section_table (ops); | |
683 | ||
684 | if (object == TARGET_OBJECT_MEMORY) | |
685 | return section_table_xfer_memory_partial (readbuf, writebuf, | |
686 | offset, len, | |
687 | table->sections, | |
688 | table->sections_end, | |
689 | NULL); | |
690 | else | |
691 | return -1; | |
692 | } | |
693 | \f | |
694 | ||
695 | void | |
696 | print_section_info (struct target_section_table *t, bfd *abfd) | |
697 | { | |
698 | struct gdbarch *gdbarch = gdbarch_from_bfd (abfd); | |
699 | struct target_section *p; | |
700 | /* FIXME: 16 is not wide enough when gdbarch_addr_bit > 64. */ | |
701 | int wid = gdbarch_addr_bit (gdbarch) <= 32 ? 8 : 16; | |
702 | ||
703 | printf_filtered ("\t`%s', ", bfd_get_filename (abfd)); | |
704 | wrap_here (" "); | |
705 | printf_filtered (_("file type %s.\n"), bfd_get_target (abfd)); | |
706 | if (abfd == exec_bfd) | |
707 | { | |
708 | /* gcc-3.4 does not like the initialization in | |
709 | <p == t->sections_end>. */ | |
710 | bfd_vma displacement = 0; | |
711 | bfd_vma entry_point; | |
712 | ||
713 | for (p = t->sections; p < t->sections_end; p++) | |
714 | { | |
715 | asection *asect = p->the_bfd_section; | |
716 | ||
717 | if ((bfd_get_section_flags (abfd, asect) & (SEC_ALLOC | SEC_LOAD)) | |
718 | != (SEC_ALLOC | SEC_LOAD)) | |
719 | continue; | |
720 | ||
721 | if (bfd_get_section_vma (abfd, asect) <= abfd->start_address | |
722 | && abfd->start_address < (bfd_get_section_vma (abfd, asect) | |
723 | + bfd_get_section_size (asect))) | |
724 | { | |
725 | displacement = p->addr - bfd_get_section_vma (abfd, asect); | |
726 | break; | |
727 | } | |
728 | } | |
729 | if (p == t->sections_end) | |
730 | warning (_("Cannot find section for the entry point of %s."), | |
731 | bfd_get_filename (abfd)); | |
732 | ||
733 | entry_point = gdbarch_addr_bits_remove (gdbarch, | |
734 | bfd_get_start_address (abfd) | |
735 | + displacement); | |
736 | printf_filtered (_("\tEntry point: %s\n"), | |
737 | paddress (gdbarch, entry_point)); | |
738 | } | |
739 | for (p = t->sections; p < t->sections_end; p++) | |
740 | { | |
741 | printf_filtered ("\t%s", hex_string_custom (p->addr, wid)); | |
742 | printf_filtered (" - %s", hex_string_custom (p->endaddr, wid)); | |
743 | ||
744 | /* FIXME: A format of "08l" is not wide enough for file offsets | |
745 | larger than 4GB. OTOH, making it "016l" isn't desirable either | |
746 | since most output will then be much wider than necessary. It | |
747 | may make sense to test the size of the file and choose the | |
748 | format string accordingly. */ | |
749 | /* FIXME: i18n: Need to rewrite this sentence. */ | |
750 | if (info_verbose) | |
751 | printf_filtered (" @ %s", | |
752 | hex_string_custom (p->the_bfd_section->filepos, 8)); | |
753 | printf_filtered (" is %s", bfd_section_name (p->bfd, | |
754 | p->the_bfd_section)); | |
755 | if (p->bfd != abfd) | |
756 | printf_filtered (" in %s", bfd_get_filename (p->bfd)); | |
757 | printf_filtered ("\n"); | |
758 | } | |
759 | } | |
760 | ||
761 | static void | |
762 | exec_files_info (struct target_ops *t) | |
763 | { | |
764 | print_section_info (current_target_sections, exec_bfd); | |
765 | ||
766 | if (vmap) | |
767 | { | |
768 | int addr_size = gdbarch_addr_bit (target_gdbarch) / 8; | |
769 | struct vmap *vp; | |
770 | ||
771 | printf_unfiltered (_("\tMapping info for file `%s'.\n"), vmap->name); | |
772 | printf_unfiltered ("\t %*s %*s %*s %*s %8.8s %s\n", | |
773 | addr_size * 2, "tstart", | |
774 | addr_size * 2, "tend", | |
775 | addr_size * 2, "dstart", | |
776 | addr_size * 2, "dend", | |
777 | "section", | |
778 | "file(member)"); | |
779 | ||
780 | for (vp = vmap; vp; vp = vp->nxt) | |
781 | printf_unfiltered ("\t0x%s 0x%s 0x%s 0x%s %s%s%s%s\n", | |
782 | phex (vp->tstart, addr_size), | |
783 | phex (vp->tend, addr_size), | |
784 | phex (vp->dstart, addr_size), | |
785 | phex (vp->dend, addr_size), | |
786 | vp->name, | |
787 | *vp->member ? "(" : "", vp->member, | |
788 | *vp->member ? ")" : ""); | |
789 | } | |
790 | } | |
791 | ||
792 | static void | |
793 | set_section_command (char *args, int from_tty) | |
794 | { | |
795 | struct target_section *p; | |
796 | char *secname; | |
797 | unsigned seclen; | |
798 | unsigned long secaddr; | |
799 | char secprint[100]; | |
800 | long offset; | |
801 | struct target_section_table *table; | |
802 | ||
803 | if (args == 0) | |
804 | error (_("Must specify section name and its virtual address")); | |
805 | ||
806 | /* Parse out section name. */ | |
807 | for (secname = args; !isspace (*args); args++); | |
808 | seclen = args - secname; | |
809 | ||
810 | /* Parse out new virtual address. */ | |
811 | secaddr = parse_and_eval_address (args); | |
812 | ||
813 | table = current_target_sections; | |
814 | for (p = table->sections; p < table->sections_end; p++) | |
815 | { | |
816 | if (!strncmp (secname, bfd_section_name (exec_bfd, | |
817 | p->the_bfd_section), seclen) | |
818 | && bfd_section_name (exec_bfd, p->the_bfd_section)[seclen] == '\0') | |
819 | { | |
820 | offset = secaddr - p->addr; | |
821 | p->addr += offset; | |
822 | p->endaddr += offset; | |
823 | if (from_tty) | |
824 | exec_files_info (&exec_ops); | |
825 | return; | |
826 | } | |
827 | } | |
828 | if (seclen >= sizeof (secprint)) | |
829 | seclen = sizeof (secprint) - 1; | |
830 | strncpy (secprint, secname, seclen); | |
831 | secprint[seclen] = '\0'; | |
832 | error (_("Section %s not found"), secprint); | |
833 | } | |
834 | ||
835 | /* If we can find a section in FILENAME with BFD index INDEX, adjust | |
836 | it to ADDRESS. */ | |
837 | ||
838 | void | |
839 | exec_set_section_address (const char *filename, int index, CORE_ADDR address) | |
840 | { | |
841 | struct target_section *p; | |
842 | struct target_section_table *table; | |
843 | ||
844 | table = current_target_sections; | |
845 | for (p = table->sections; p < table->sections_end; p++) | |
846 | { | |
847 | if (filename_cmp (filename, p->bfd->filename) == 0 | |
848 | && index == p->the_bfd_section->index) | |
849 | { | |
850 | p->endaddr += address - p->addr; | |
851 | p->addr = address; | |
852 | } | |
853 | } | |
854 | } | |
855 | ||
856 | /* If mourn is being called in all the right places, this could be say | |
857 | `gdb internal error' (since generic_mourn calls | |
858 | breakpoint_init_inferior). */ | |
859 | ||
860 | static int | |
861 | ignore (struct gdbarch *gdbarch, struct bp_target_info *bp_tgt) | |
862 | { | |
863 | return 0; | |
864 | } | |
865 | ||
866 | static int | |
867 | exec_has_memory (struct target_ops *ops) | |
868 | { | |
869 | /* We can provide memory if we have any file/target sections to read | |
870 | from. */ | |
871 | return (current_target_sections->sections | |
872 | != current_target_sections->sections_end); | |
873 | } | |
874 | ||
875 | /* Find mapped memory. */ | |
876 | ||
877 | extern void | |
878 | exec_set_find_memory_regions (int (*func) (find_memory_region_ftype, void *)) | |
879 | { | |
880 | exec_ops.to_find_memory_regions = func; | |
881 | } | |
882 | ||
883 | static char *exec_make_note_section (bfd *, int *); | |
884 | ||
885 | /* Fill in the exec file target vector. Very few entries need to be | |
886 | defined. */ | |
887 | ||
888 | static void | |
889 | init_exec_ops (void) | |
890 | { | |
891 | exec_ops.to_shortname = "exec"; | |
892 | exec_ops.to_longname = "Local exec file"; | |
893 | exec_ops.to_doc = "Use an executable file as a target.\n\ | |
894 | Specify the filename of the executable file."; | |
895 | exec_ops.to_open = exec_open; | |
896 | exec_ops.to_close = exec_close_1; | |
897 | exec_ops.to_attach = find_default_attach; | |
898 | exec_ops.to_xfer_partial = exec_xfer_partial; | |
899 | exec_ops.to_get_section_table = exec_get_section_table; | |
900 | exec_ops.to_files_info = exec_files_info; | |
901 | exec_ops.to_insert_breakpoint = ignore; | |
902 | exec_ops.to_remove_breakpoint = ignore; | |
903 | exec_ops.to_create_inferior = find_default_create_inferior; | |
904 | exec_ops.to_stratum = file_stratum; | |
905 | exec_ops.to_has_memory = exec_has_memory; | |
906 | exec_ops.to_make_corefile_notes = exec_make_note_section; | |
907 | exec_ops.to_magic = OPS_MAGIC; | |
908 | } | |
909 | ||
910 | void | |
911 | _initialize_exec (void) | |
912 | { | |
913 | struct cmd_list_element *c; | |
914 | ||
915 | init_exec_ops (); | |
916 | ||
917 | if (!dbx_commands) | |
918 | { | |
919 | c = add_cmd ("file", class_files, file_command, _("\ | |
920 | Use FILE as program to be debugged.\n\ | |
921 | It is read for its symbols, for getting the contents of pure memory,\n\ | |
922 | and it is the program executed when you use the `run' command.\n\ | |
923 | If FILE cannot be found as specified, your execution directory path\n\ | |
924 | ($PATH) is searched for a command of that name.\n\ | |
925 | No arg means to have no executable file and no symbols."), &cmdlist); | |
926 | set_cmd_completer (c, filename_completer); | |
927 | } | |
928 | ||
929 | c = add_cmd ("exec-file", class_files, exec_file_command, _("\ | |
930 | Use FILE as program for getting contents of pure memory.\n\ | |
931 | If FILE cannot be found as specified, your execution directory path\n\ | |
932 | is searched for a command of that name.\n\ | |
933 | No arg means have no executable file."), &cmdlist); | |
934 | set_cmd_completer (c, filename_completer); | |
935 | ||
936 | add_com ("section", class_files, set_section_command, _("\ | |
937 | Change the base address of section SECTION of the exec file to ADDR.\n\ | |
938 | This can be used if the exec file does not contain section addresses,\n\ | |
939 | (such as in the a.out format), or when the addresses specified in the\n\ | |
940 | file itself are wrong. Each section must be changed separately. The\n\ | |
941 | ``info files'' command lists all the sections and their addresses.")); | |
942 | ||
943 | add_setshow_boolean_cmd ("write", class_support, &write_files, _("\ | |
944 | Set writing into executable and core files."), _("\ | |
945 | Show writing into executable and core files."), NULL, | |
946 | NULL, | |
947 | show_write_files, | |
948 | &setlist, &showlist); | |
949 | ||
950 | add_target (&exec_ops); | |
951 | } | |
952 | ||
953 | static char * | |
954 | exec_make_note_section (bfd *obfd, int *note_size) | |
955 | { | |
956 | error (_("Can't create a corefile")); | |
957 | } |