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1 | /* Work with executable files, for GDB. | |
2 | ||
3 | Copyright (C) 1988-2017 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 | #include "gdb_bfd.h" | |
37 | #include "gcore.h" | |
38 | ||
39 | #include <fcntl.h> | |
40 | #include "readline/readline.h" | |
41 | #include "gdbcore.h" | |
42 | ||
43 | #include <ctype.h> | |
44 | #include <sys/stat.h> | |
45 | #include "solist.h" | |
46 | #include <algorithm> | |
47 | ||
48 | void (*deprecated_file_changed_hook) (char *); | |
49 | ||
50 | /* Prototypes for local functions */ | |
51 | ||
52 | static void file_command (char *, int); | |
53 | ||
54 | static void set_section_command (char *, int); | |
55 | ||
56 | static void exec_files_info (struct target_ops *); | |
57 | ||
58 | static void init_exec_ops (void); | |
59 | ||
60 | void _initialize_exec (void); | |
61 | ||
62 | /* The target vector for executable files. */ | |
63 | ||
64 | static struct target_ops exec_ops; | |
65 | ||
66 | /* Whether to open exec and core files read-only or read-write. */ | |
67 | ||
68 | int write_files = 0; | |
69 | static void | |
70 | show_write_files (struct ui_file *file, int from_tty, | |
71 | struct cmd_list_element *c, const char *value) | |
72 | { | |
73 | fprintf_filtered (file, _("Writing into executable and core files is %s.\n"), | |
74 | value); | |
75 | } | |
76 | ||
77 | ||
78 | static void | |
79 | exec_open (const char *args, int from_tty) | |
80 | { | |
81 | target_preopen (from_tty); | |
82 | exec_file_attach (args, from_tty); | |
83 | } | |
84 | ||
85 | /* Close and clear exec_bfd. If we end up with no target sections to | |
86 | read memory from, this unpushes the exec_ops target. */ | |
87 | ||
88 | void | |
89 | exec_close (void) | |
90 | { | |
91 | if (exec_bfd) | |
92 | { | |
93 | bfd *abfd = exec_bfd; | |
94 | ||
95 | gdb_bfd_unref (abfd); | |
96 | ||
97 | /* Removing target sections may close the exec_ops target. | |
98 | Clear exec_bfd before doing so to prevent recursion. */ | |
99 | exec_bfd = NULL; | |
100 | exec_bfd_mtime = 0; | |
101 | ||
102 | remove_target_sections (&exec_bfd); | |
103 | ||
104 | xfree (exec_filename); | |
105 | exec_filename = NULL; | |
106 | } | |
107 | } | |
108 | ||
109 | /* This is the target_close implementation. Clears all target | |
110 | sections and closes all executable bfds from all program spaces. */ | |
111 | ||
112 | static void | |
113 | exec_close_1 (struct target_ops *self) | |
114 | { | |
115 | struct program_space *ss; | |
116 | struct cleanup *old_chain; | |
117 | ||
118 | old_chain = save_current_program_space (); | |
119 | ALL_PSPACES (ss) | |
120 | { | |
121 | set_current_program_space (ss); | |
122 | clear_section_table (current_target_sections); | |
123 | exec_close (); | |
124 | } | |
125 | ||
126 | do_cleanups (old_chain); | |
127 | } | |
128 | ||
129 | void | |
130 | exec_file_clear (int from_tty) | |
131 | { | |
132 | /* Remove exec file. */ | |
133 | exec_close (); | |
134 | ||
135 | if (from_tty) | |
136 | printf_unfiltered (_("No executable file now.\n")); | |
137 | } | |
138 | ||
139 | /* See exec.h. */ | |
140 | ||
141 | void | |
142 | try_open_exec_file (const char *exec_file_host, struct inferior *inf, | |
143 | symfile_add_flags add_flags) | |
144 | { | |
145 | struct cleanup *old_chain; | |
146 | struct gdb_exception prev_err = exception_none; | |
147 | ||
148 | old_chain = make_cleanup (free_current_contents, &prev_err.message); | |
149 | ||
150 | /* exec_file_attach and symbol_file_add_main may throw an error if the file | |
151 | cannot be opened either locally or remotely. | |
152 | ||
153 | This happens for example, when the file is first found in the local | |
154 | sysroot (above), and then disappears (a TOCTOU race), or when it doesn't | |
155 | exist in the target filesystem, or when the file does exist, but | |
156 | is not readable. | |
157 | ||
158 | Even without a symbol file, the remote-based debugging session should | |
159 | continue normally instead of ending abruptly. Hence we catch thrown | |
160 | errors/exceptions in the following code. */ | |
161 | TRY | |
162 | { | |
163 | /* We must do this step even if exec_file_host is NULL, so that | |
164 | exec_file_attach will clear state. */ | |
165 | exec_file_attach (exec_file_host, add_flags & SYMFILE_VERBOSE); | |
166 | } | |
167 | CATCH (err, RETURN_MASK_ERROR) | |
168 | { | |
169 | if (err.message != NULL) | |
170 | warning ("%s", err.message); | |
171 | ||
172 | prev_err = err; | |
173 | ||
174 | /* Save message so it doesn't get trashed by the catch below. */ | |
175 | if (err.message != NULL) | |
176 | prev_err.message = xstrdup (err.message); | |
177 | } | |
178 | END_CATCH | |
179 | ||
180 | if (exec_file_host != NULL) | |
181 | { | |
182 | TRY | |
183 | { | |
184 | symbol_file_add_main (exec_file_host, add_flags); | |
185 | } | |
186 | CATCH (err, RETURN_MASK_ERROR) | |
187 | { | |
188 | if (!exception_print_same (prev_err, err)) | |
189 | warning ("%s", err.message); | |
190 | } | |
191 | END_CATCH | |
192 | } | |
193 | ||
194 | do_cleanups (old_chain); | |
195 | } | |
196 | ||
197 | /* See gdbcore.h. */ | |
198 | ||
199 | void | |
200 | exec_file_locate_attach (int pid, int defer_bp_reset, int from_tty) | |
201 | { | |
202 | char *exec_file_target, *exec_file_host; | |
203 | struct cleanup *old_chain; | |
204 | symfile_add_flags add_flags = 0; | |
205 | ||
206 | /* Do nothing if we already have an executable filename. */ | |
207 | if (get_exec_file (0) != NULL) | |
208 | return; | |
209 | ||
210 | /* Try to determine a filename from the process itself. */ | |
211 | exec_file_target = target_pid_to_exec_file (pid); | |
212 | if (exec_file_target == NULL) | |
213 | { | |
214 | warning (_("No executable has been specified and target does not " | |
215 | "support\n" | |
216 | "determining executable automatically. " | |
217 | "Try using the \"file\" command.")); | |
218 | return; | |
219 | } | |
220 | ||
221 | exec_file_host = exec_file_find (exec_file_target, NULL); | |
222 | old_chain = make_cleanup (xfree, exec_file_host); | |
223 | ||
224 | if (defer_bp_reset) | |
225 | add_flags |= SYMFILE_DEFER_BP_RESET; | |
226 | ||
227 | if (from_tty) | |
228 | add_flags |= SYMFILE_VERBOSE; | |
229 | ||
230 | /* Attempt to open the exec file. */ | |
231 | try_open_exec_file (exec_file_host, current_inferior (), add_flags); | |
232 | do_cleanups (old_chain); | |
233 | } | |
234 | ||
235 | /* Set FILENAME as the new exec file. | |
236 | ||
237 | This function is intended to be behave essentially the same | |
238 | as exec_file_command, except that the latter will detect when | |
239 | a target is being debugged, and will ask the user whether it | |
240 | should be shut down first. (If the answer is "no", then the | |
241 | new file is ignored.) | |
242 | ||
243 | This file is used by exec_file_command, to do the work of opening | |
244 | and processing the exec file after any prompting has happened. | |
245 | ||
246 | And, it is used by child_attach, when the attach command was | |
247 | given a pid but not a exec pathname, and the attach command could | |
248 | figure out the pathname from the pid. (In this case, we shouldn't | |
249 | ask the user whether the current target should be shut down -- | |
250 | we're supplying the exec pathname late for good reason.) */ | |
251 | ||
252 | void | |
253 | exec_file_attach (const char *filename, int from_tty) | |
254 | { | |
255 | struct cleanup *cleanups; | |
256 | ||
257 | /* First, acquire a reference to the current exec_bfd. We release | |
258 | this at the end of the function; but acquiring it now lets the | |
259 | BFD cache return it if this call refers to the same file. */ | |
260 | gdb_bfd_ref (exec_bfd); | |
261 | cleanups = make_cleanup_bfd_unref (exec_bfd); | |
262 | ||
263 | /* Remove any previous exec file. */ | |
264 | exec_close (); | |
265 | ||
266 | /* Now open and digest the file the user requested, if any. */ | |
267 | ||
268 | if (!filename) | |
269 | { | |
270 | if (from_tty) | |
271 | printf_unfiltered (_("No executable file now.\n")); | |
272 | ||
273 | set_gdbarch_from_file (NULL); | |
274 | } | |
275 | else | |
276 | { | |
277 | int load_via_target = 0; | |
278 | char *scratch_pathname, *canonical_pathname; | |
279 | int scratch_chan; | |
280 | struct target_section *sections = NULL, *sections_end = NULL; | |
281 | char **matching; | |
282 | ||
283 | if (is_target_filename (filename)) | |
284 | { | |
285 | if (target_filesystem_is_local ()) | |
286 | filename += strlen (TARGET_SYSROOT_PREFIX); | |
287 | else | |
288 | load_via_target = 1; | |
289 | } | |
290 | ||
291 | if (load_via_target) | |
292 | { | |
293 | /* gdb_bfd_fopen does not support "target:" filenames. */ | |
294 | if (write_files) | |
295 | warning (_("writing into executable files is " | |
296 | "not supported for %s sysroots"), | |
297 | TARGET_SYSROOT_PREFIX); | |
298 | ||
299 | scratch_pathname = xstrdup (filename); | |
300 | make_cleanup (xfree, scratch_pathname); | |
301 | ||
302 | scratch_chan = -1; | |
303 | ||
304 | canonical_pathname = scratch_pathname; | |
305 | } | |
306 | else | |
307 | { | |
308 | scratch_chan = openp (getenv ("PATH"), OPF_TRY_CWD_FIRST, | |
309 | filename, write_files ? | |
310 | O_RDWR | O_BINARY : O_RDONLY | O_BINARY, | |
311 | &scratch_pathname); | |
312 | #if defined(__GO32__) || defined(_WIN32) || defined(__CYGWIN__) | |
313 | if (scratch_chan < 0) | |
314 | { | |
315 | char *exename = (char *) alloca (strlen (filename) + 5); | |
316 | ||
317 | strcat (strcpy (exename, filename), ".exe"); | |
318 | scratch_chan = openp (getenv ("PATH"), OPF_TRY_CWD_FIRST, | |
319 | exename, write_files ? | |
320 | O_RDWR | O_BINARY | |
321 | : O_RDONLY | O_BINARY, | |
322 | &scratch_pathname); | |
323 | } | |
324 | #endif | |
325 | if (scratch_chan < 0) | |
326 | perror_with_name (filename); | |
327 | ||
328 | make_cleanup (xfree, scratch_pathname); | |
329 | ||
330 | /* gdb_bfd_open (and its variants) prefers canonicalized | |
331 | pathname for better BFD caching. */ | |
332 | canonical_pathname = gdb_realpath (scratch_pathname); | |
333 | make_cleanup (xfree, canonical_pathname); | |
334 | } | |
335 | ||
336 | if (write_files && !load_via_target) | |
337 | exec_bfd = gdb_bfd_fopen (canonical_pathname, gnutarget, | |
338 | FOPEN_RUB, scratch_chan); | |
339 | else | |
340 | exec_bfd = gdb_bfd_open (canonical_pathname, gnutarget, scratch_chan); | |
341 | ||
342 | if (!exec_bfd) | |
343 | { | |
344 | error (_("\"%s\": could not open as an executable file: %s."), | |
345 | scratch_pathname, bfd_errmsg (bfd_get_error ())); | |
346 | } | |
347 | ||
348 | /* gdb_realpath_keepfile resolves symlinks on the local | |
349 | filesystem and so cannot be used for "target:" files. */ | |
350 | gdb_assert (exec_filename == NULL); | |
351 | if (load_via_target) | |
352 | exec_filename = xstrdup (bfd_get_filename (exec_bfd)); | |
353 | else | |
354 | exec_filename = gdb_realpath_keepfile (scratch_pathname); | |
355 | ||
356 | if (!bfd_check_format_matches (exec_bfd, bfd_object, &matching)) | |
357 | { | |
358 | /* Make sure to close exec_bfd, or else "run" might try to use | |
359 | it. */ | |
360 | exec_close (); | |
361 | error (_("\"%s\": not in executable format: %s"), | |
362 | scratch_pathname, | |
363 | gdb_bfd_errmsg (bfd_get_error (), matching)); | |
364 | } | |
365 | ||
366 | if (build_section_table (exec_bfd, §ions, §ions_end)) | |
367 | { | |
368 | /* Make sure to close exec_bfd, or else "run" might try to use | |
369 | it. */ | |
370 | exec_close (); | |
371 | error (_("\"%s\": can't find the file sections: %s"), | |
372 | scratch_pathname, bfd_errmsg (bfd_get_error ())); | |
373 | } | |
374 | ||
375 | exec_bfd_mtime = bfd_get_mtime (exec_bfd); | |
376 | ||
377 | validate_files (); | |
378 | ||
379 | set_gdbarch_from_file (exec_bfd); | |
380 | ||
381 | /* Add the executable's sections to the current address spaces' | |
382 | list of sections. This possibly pushes the exec_ops | |
383 | target. */ | |
384 | add_target_sections (&exec_bfd, sections, sections_end); | |
385 | xfree (sections); | |
386 | ||
387 | /* Tell display code (if any) about the changed file name. */ | |
388 | if (deprecated_exec_file_display_hook) | |
389 | (*deprecated_exec_file_display_hook) (filename); | |
390 | } | |
391 | ||
392 | do_cleanups (cleanups); | |
393 | ||
394 | bfd_cache_close_all (); | |
395 | observer_notify_executable_changed (); | |
396 | } | |
397 | ||
398 | /* Process the first arg in ARGS as the new exec file. | |
399 | ||
400 | Note that we have to explicitly ignore additional args, since we can | |
401 | be called from file_command(), which also calls symbol_file_command() | |
402 | which can take multiple args. | |
403 | ||
404 | If ARGS is NULL, we just want to close the exec file. */ | |
405 | ||
406 | static void | |
407 | exec_file_command (char *args, int from_tty) | |
408 | { | |
409 | char **argv; | |
410 | char *filename; | |
411 | ||
412 | if (from_tty && target_has_execution | |
413 | && !query (_("A program is being debugged already.\n" | |
414 | "Are you sure you want to change the file? "))) | |
415 | error (_("File not changed.")); | |
416 | ||
417 | if (args) | |
418 | { | |
419 | struct cleanup *cleanups; | |
420 | ||
421 | /* Scan through the args and pick up the first non option arg | |
422 | as the filename. */ | |
423 | ||
424 | argv = gdb_buildargv (args); | |
425 | cleanups = make_cleanup_freeargv (argv); | |
426 | ||
427 | for (; (*argv != NULL) && (**argv == '-'); argv++) | |
428 | {; | |
429 | } | |
430 | if (*argv == NULL) | |
431 | error (_("No executable file name was specified")); | |
432 | ||
433 | filename = tilde_expand (*argv); | |
434 | make_cleanup (xfree, filename); | |
435 | exec_file_attach (filename, from_tty); | |
436 | ||
437 | do_cleanups (cleanups); | |
438 | } | |
439 | else | |
440 | exec_file_attach (NULL, from_tty); | |
441 | } | |
442 | ||
443 | /* Set both the exec file and the symbol file, in one command. | |
444 | What a novelty. Why did GDB go through four major releases before this | |
445 | command was added? */ | |
446 | ||
447 | static void | |
448 | file_command (char *arg, int from_tty) | |
449 | { | |
450 | /* FIXME, if we lose on reading the symbol file, we should revert | |
451 | the exec file, but that's rough. */ | |
452 | exec_file_command (arg, from_tty); | |
453 | symbol_file_command (arg, from_tty); | |
454 | if (deprecated_file_changed_hook) | |
455 | deprecated_file_changed_hook (arg); | |
456 | } | |
457 | \f | |
458 | ||
459 | /* Locate all mappable sections of a BFD file. | |
460 | table_pp_char is a char * to get it through bfd_map_over_sections; | |
461 | we cast it back to its proper type. */ | |
462 | ||
463 | static void | |
464 | add_to_section_table (bfd *abfd, struct bfd_section *asect, | |
465 | void *table_pp_char) | |
466 | { | |
467 | struct target_section **table_pp = (struct target_section **) table_pp_char; | |
468 | flagword aflag; | |
469 | ||
470 | gdb_assert (abfd == asect->owner); | |
471 | ||
472 | /* Check the section flags, but do not discard zero-length sections, since | |
473 | some symbols may still be attached to this section. For instance, we | |
474 | encountered on sparc-solaris 2.10 a shared library with an empty .bss | |
475 | section to which a symbol named "_end" was attached. The address | |
476 | of this symbol still needs to be relocated. */ | |
477 | aflag = bfd_get_section_flags (abfd, asect); | |
478 | if (!(aflag & SEC_ALLOC)) | |
479 | return; | |
480 | ||
481 | (*table_pp)->owner = NULL; | |
482 | (*table_pp)->the_bfd_section = asect; | |
483 | (*table_pp)->addr = bfd_section_vma (abfd, asect); | |
484 | (*table_pp)->endaddr = (*table_pp)->addr + bfd_section_size (abfd, asect); | |
485 | (*table_pp)++; | |
486 | } | |
487 | ||
488 | /* See exec.h. */ | |
489 | ||
490 | void | |
491 | clear_section_table (struct target_section_table *table) | |
492 | { | |
493 | xfree (table->sections); | |
494 | table->sections = table->sections_end = NULL; | |
495 | } | |
496 | ||
497 | /* Resize section table TABLE by ADJUSTMENT. | |
498 | ADJUSTMENT may be negative, in which case the caller must have already | |
499 | removed the sections being deleted. | |
500 | Returns the old size. */ | |
501 | ||
502 | static int | |
503 | resize_section_table (struct target_section_table *table, int adjustment) | |
504 | { | |
505 | int old_count; | |
506 | int new_count; | |
507 | ||
508 | old_count = table->sections_end - table->sections; | |
509 | ||
510 | new_count = adjustment + old_count; | |
511 | ||
512 | if (new_count) | |
513 | { | |
514 | table->sections = XRESIZEVEC (struct target_section, table->sections, | |
515 | new_count); | |
516 | table->sections_end = table->sections + new_count; | |
517 | } | |
518 | else | |
519 | clear_section_table (table); | |
520 | ||
521 | return old_count; | |
522 | } | |
523 | ||
524 | /* Builds a section table, given args BFD, SECTABLE_PTR, SECEND_PTR. | |
525 | Returns 0 if OK, 1 on error. */ | |
526 | ||
527 | int | |
528 | build_section_table (struct bfd *some_bfd, struct target_section **start, | |
529 | struct target_section **end) | |
530 | { | |
531 | unsigned count; | |
532 | ||
533 | count = bfd_count_sections (some_bfd); | |
534 | if (*start) | |
535 | xfree (* start); | |
536 | *start = XNEWVEC (struct target_section, count); | |
537 | *end = *start; | |
538 | bfd_map_over_sections (some_bfd, add_to_section_table, (char *) end); | |
539 | if (*end > *start + count) | |
540 | internal_error (__FILE__, __LINE__, | |
541 | _("failed internal consistency check")); | |
542 | /* We could realloc the table, but it probably loses for most files. */ | |
543 | return 0; | |
544 | } | |
545 | ||
546 | /* Add the sections array defined by [SECTIONS..SECTIONS_END[ to the | |
547 | current set of target sections. */ | |
548 | ||
549 | void | |
550 | add_target_sections (void *owner, | |
551 | struct target_section *sections, | |
552 | struct target_section *sections_end) | |
553 | { | |
554 | int count; | |
555 | struct target_section_table *table = current_target_sections; | |
556 | ||
557 | count = sections_end - sections; | |
558 | ||
559 | if (count > 0) | |
560 | { | |
561 | int space = resize_section_table (table, count); | |
562 | int i; | |
563 | ||
564 | for (i = 0; i < count; ++i) | |
565 | { | |
566 | table->sections[space + i] = sections[i]; | |
567 | table->sections[space + i].owner = owner; | |
568 | } | |
569 | ||
570 | /* If these are the first file sections we can provide memory | |
571 | from, push the file_stratum target. */ | |
572 | if (!target_is_pushed (&exec_ops)) | |
573 | push_target (&exec_ops); | |
574 | } | |
575 | } | |
576 | ||
577 | /* Add the sections of OBJFILE to the current set of target sections. */ | |
578 | ||
579 | void | |
580 | add_target_sections_of_objfile (struct objfile *objfile) | |
581 | { | |
582 | struct target_section_table *table = current_target_sections; | |
583 | struct obj_section *osect; | |
584 | int space; | |
585 | unsigned count = 0; | |
586 | struct target_section *ts; | |
587 | ||
588 | if (objfile == NULL) | |
589 | return; | |
590 | ||
591 | /* Compute the number of sections to add. */ | |
592 | ALL_OBJFILE_OSECTIONS (objfile, osect) | |
593 | { | |
594 | if (bfd_get_section_size (osect->the_bfd_section) == 0) | |
595 | continue; | |
596 | count++; | |
597 | } | |
598 | ||
599 | if (count == 0) | |
600 | return; | |
601 | ||
602 | space = resize_section_table (table, count); | |
603 | ||
604 | ts = table->sections + space; | |
605 | ||
606 | ALL_OBJFILE_OSECTIONS (objfile, osect) | |
607 | { | |
608 | if (bfd_get_section_size (osect->the_bfd_section) == 0) | |
609 | continue; | |
610 | ||
611 | gdb_assert (ts < table->sections + space + count); | |
612 | ||
613 | ts->addr = obj_section_addr (osect); | |
614 | ts->endaddr = obj_section_endaddr (osect); | |
615 | ts->the_bfd_section = osect->the_bfd_section; | |
616 | ts->owner = (void *) objfile; | |
617 | ||
618 | ts++; | |
619 | } | |
620 | } | |
621 | ||
622 | /* Remove all target sections owned by OWNER. | |
623 | OWNER must be the same value passed to add_target_sections. */ | |
624 | ||
625 | void | |
626 | remove_target_sections (void *owner) | |
627 | { | |
628 | struct target_section *src, *dest; | |
629 | struct target_section_table *table = current_target_sections; | |
630 | ||
631 | gdb_assert (owner != NULL); | |
632 | ||
633 | dest = table->sections; | |
634 | for (src = table->sections; src < table->sections_end; src++) | |
635 | if (src->owner != owner) | |
636 | { | |
637 | /* Keep this section. */ | |
638 | if (dest < src) | |
639 | *dest = *src; | |
640 | dest++; | |
641 | } | |
642 | ||
643 | /* If we've dropped any sections, resize the section table. */ | |
644 | if (dest < src) | |
645 | { | |
646 | int old_count; | |
647 | ||
648 | old_count = resize_section_table (table, dest - src); | |
649 | ||
650 | /* If we don't have any more sections to read memory from, | |
651 | remove the file_stratum target from the stack. */ | |
652 | if (old_count + (dest - src) == 0) | |
653 | { | |
654 | struct program_space *pspace; | |
655 | ||
656 | ALL_PSPACES (pspace) | |
657 | if (pspace->target_sections.sections | |
658 | != pspace->target_sections.sections_end) | |
659 | return; | |
660 | ||
661 | unpush_target (&exec_ops); | |
662 | } | |
663 | } | |
664 | } | |
665 | ||
666 | \f | |
667 | ||
668 | enum target_xfer_status | |
669 | exec_read_partial_read_only (gdb_byte *readbuf, ULONGEST offset, | |
670 | ULONGEST len, ULONGEST *xfered_len) | |
671 | { | |
672 | /* It's unduly pedantic to refuse to look at the executable for | |
673 | read-only pieces; so do the equivalent of readonly regions aka | |
674 | QTro packet. */ | |
675 | if (exec_bfd != NULL) | |
676 | { | |
677 | asection *s; | |
678 | bfd_size_type size; | |
679 | bfd_vma vma; | |
680 | ||
681 | for (s = exec_bfd->sections; s; s = s->next) | |
682 | { | |
683 | if ((s->flags & SEC_LOAD) == 0 | |
684 | || (s->flags & SEC_READONLY) == 0) | |
685 | continue; | |
686 | ||
687 | vma = s->vma; | |
688 | size = bfd_get_section_size (s); | |
689 | if (vma <= offset && offset < (vma + size)) | |
690 | { | |
691 | ULONGEST amt; | |
692 | ||
693 | amt = (vma + size) - offset; | |
694 | if (amt > len) | |
695 | amt = len; | |
696 | ||
697 | amt = bfd_get_section_contents (exec_bfd, s, | |
698 | readbuf, offset - vma, amt); | |
699 | ||
700 | if (amt == 0) | |
701 | return TARGET_XFER_EOF; | |
702 | else | |
703 | { | |
704 | *xfered_len = amt; | |
705 | return TARGET_XFER_OK; | |
706 | } | |
707 | } | |
708 | } | |
709 | } | |
710 | ||
711 | /* Indicate failure to find the requested memory block. */ | |
712 | return TARGET_XFER_E_IO; | |
713 | } | |
714 | ||
715 | /* Appends all read-only memory ranges found in the target section | |
716 | table defined by SECTIONS and SECTIONS_END, starting at (and | |
717 | intersected with) MEMADDR for LEN bytes. Returns the augmented | |
718 | VEC. */ | |
719 | ||
720 | static VEC(mem_range_s) * | |
721 | section_table_available_memory (VEC(mem_range_s) *memory, | |
722 | CORE_ADDR memaddr, ULONGEST len, | |
723 | struct target_section *sections, | |
724 | struct target_section *sections_end) | |
725 | { | |
726 | struct target_section *p; | |
727 | ||
728 | for (p = sections; p < sections_end; p++) | |
729 | { | |
730 | if ((bfd_get_section_flags (p->the_bfd_section->owner, | |
731 | p->the_bfd_section) | |
732 | & SEC_READONLY) == 0) | |
733 | continue; | |
734 | ||
735 | /* Copy the meta-data, adjusted. */ | |
736 | if (mem_ranges_overlap (p->addr, p->endaddr - p->addr, memaddr, len)) | |
737 | { | |
738 | ULONGEST lo1, hi1, lo2, hi2; | |
739 | struct mem_range *r; | |
740 | ||
741 | lo1 = memaddr; | |
742 | hi1 = memaddr + len; | |
743 | ||
744 | lo2 = p->addr; | |
745 | hi2 = p->endaddr; | |
746 | ||
747 | r = VEC_safe_push (mem_range_s, memory, NULL); | |
748 | ||
749 | r->start = std::max (lo1, lo2); | |
750 | r->length = std::min (hi1, hi2) - r->start; | |
751 | } | |
752 | } | |
753 | ||
754 | return memory; | |
755 | } | |
756 | ||
757 | enum target_xfer_status | |
758 | section_table_read_available_memory (gdb_byte *readbuf, ULONGEST offset, | |
759 | ULONGEST len, ULONGEST *xfered_len) | |
760 | { | |
761 | VEC(mem_range_s) *available_memory = NULL; | |
762 | struct target_section_table *table; | |
763 | struct cleanup *old_chain; | |
764 | mem_range_s *r; | |
765 | int i; | |
766 | ||
767 | table = target_get_section_table (&exec_ops); | |
768 | available_memory = section_table_available_memory (available_memory, | |
769 | offset, len, | |
770 | table->sections, | |
771 | table->sections_end); | |
772 | ||
773 | old_chain = make_cleanup (VEC_cleanup(mem_range_s), | |
774 | &available_memory); | |
775 | ||
776 | normalize_mem_ranges (available_memory); | |
777 | ||
778 | for (i = 0; | |
779 | VEC_iterate (mem_range_s, available_memory, i, r); | |
780 | i++) | |
781 | { | |
782 | if (mem_ranges_overlap (r->start, r->length, offset, len)) | |
783 | { | |
784 | CORE_ADDR end; | |
785 | enum target_xfer_status status; | |
786 | ||
787 | /* Get the intersection window. */ | |
788 | end = std::min<CORE_ADDR> (offset + len, r->start + r->length); | |
789 | ||
790 | gdb_assert (end - offset <= len); | |
791 | ||
792 | if (offset >= r->start) | |
793 | status = exec_read_partial_read_only (readbuf, offset, | |
794 | end - offset, | |
795 | xfered_len); | |
796 | else | |
797 | { | |
798 | *xfered_len = r->start - offset; | |
799 | status = TARGET_XFER_UNAVAILABLE; | |
800 | } | |
801 | do_cleanups (old_chain); | |
802 | return status; | |
803 | } | |
804 | } | |
805 | do_cleanups (old_chain); | |
806 | ||
807 | *xfered_len = len; | |
808 | return TARGET_XFER_UNAVAILABLE; | |
809 | } | |
810 | ||
811 | enum target_xfer_status | |
812 | section_table_xfer_memory_partial (gdb_byte *readbuf, const gdb_byte *writebuf, | |
813 | ULONGEST offset, ULONGEST len, | |
814 | ULONGEST *xfered_len, | |
815 | struct target_section *sections, | |
816 | struct target_section *sections_end, | |
817 | const char *section_name) | |
818 | { | |
819 | int res; | |
820 | struct target_section *p; | |
821 | ULONGEST memaddr = offset; | |
822 | ULONGEST memend = memaddr + len; | |
823 | ||
824 | if (len == 0) | |
825 | internal_error (__FILE__, __LINE__, | |
826 | _("failed internal consistency check")); | |
827 | ||
828 | for (p = sections; p < sections_end; p++) | |
829 | { | |
830 | struct bfd_section *asect = p->the_bfd_section; | |
831 | bfd *abfd = asect->owner; | |
832 | ||
833 | if (section_name && strcmp (section_name, asect->name) != 0) | |
834 | continue; /* not the section we need. */ | |
835 | if (memaddr >= p->addr) | |
836 | { | |
837 | if (memend <= p->endaddr) | |
838 | { | |
839 | /* Entire transfer is within this section. */ | |
840 | if (writebuf) | |
841 | res = bfd_set_section_contents (abfd, asect, | |
842 | writebuf, memaddr - p->addr, | |
843 | len); | |
844 | else | |
845 | res = bfd_get_section_contents (abfd, asect, | |
846 | readbuf, memaddr - p->addr, | |
847 | len); | |
848 | ||
849 | if (res != 0) | |
850 | { | |
851 | *xfered_len = len; | |
852 | return TARGET_XFER_OK; | |
853 | } | |
854 | else | |
855 | return TARGET_XFER_EOF; | |
856 | } | |
857 | else if (memaddr >= p->endaddr) | |
858 | { | |
859 | /* This section ends before the transfer starts. */ | |
860 | continue; | |
861 | } | |
862 | else | |
863 | { | |
864 | /* This section overlaps the transfer. Just do half. */ | |
865 | len = p->endaddr - memaddr; | |
866 | if (writebuf) | |
867 | res = bfd_set_section_contents (abfd, asect, | |
868 | writebuf, memaddr - p->addr, | |
869 | len); | |
870 | else | |
871 | res = bfd_get_section_contents (abfd, asect, | |
872 | readbuf, memaddr - p->addr, | |
873 | len); | |
874 | if (res != 0) | |
875 | { | |
876 | *xfered_len = len; | |
877 | return TARGET_XFER_OK; | |
878 | } | |
879 | else | |
880 | return TARGET_XFER_EOF; | |
881 | } | |
882 | } | |
883 | } | |
884 | ||
885 | return TARGET_XFER_EOF; /* We can't help. */ | |
886 | } | |
887 | ||
888 | static struct target_section_table * | |
889 | exec_get_section_table (struct target_ops *ops) | |
890 | { | |
891 | return current_target_sections; | |
892 | } | |
893 | ||
894 | static enum target_xfer_status | |
895 | exec_xfer_partial (struct target_ops *ops, enum target_object object, | |
896 | const char *annex, gdb_byte *readbuf, | |
897 | const gdb_byte *writebuf, | |
898 | ULONGEST offset, ULONGEST len, ULONGEST *xfered_len) | |
899 | { | |
900 | struct target_section_table *table = target_get_section_table (ops); | |
901 | ||
902 | if (object == TARGET_OBJECT_MEMORY) | |
903 | return section_table_xfer_memory_partial (readbuf, writebuf, | |
904 | offset, len, xfered_len, | |
905 | table->sections, | |
906 | table->sections_end, | |
907 | NULL); | |
908 | else | |
909 | return TARGET_XFER_E_IO; | |
910 | } | |
911 | \f | |
912 | ||
913 | void | |
914 | print_section_info (struct target_section_table *t, bfd *abfd) | |
915 | { | |
916 | struct gdbarch *gdbarch = gdbarch_from_bfd (abfd); | |
917 | struct target_section *p; | |
918 | /* FIXME: 16 is not wide enough when gdbarch_addr_bit > 64. */ | |
919 | int wid = gdbarch_addr_bit (gdbarch) <= 32 ? 8 : 16; | |
920 | ||
921 | printf_filtered ("\t`%s', ", bfd_get_filename (abfd)); | |
922 | wrap_here (" "); | |
923 | printf_filtered (_("file type %s.\n"), bfd_get_target (abfd)); | |
924 | if (abfd == exec_bfd) | |
925 | { | |
926 | /* gcc-3.4 does not like the initialization in | |
927 | <p == t->sections_end>. */ | |
928 | bfd_vma displacement = 0; | |
929 | bfd_vma entry_point; | |
930 | ||
931 | for (p = t->sections; p < t->sections_end; p++) | |
932 | { | |
933 | struct bfd_section *psect = p->the_bfd_section; | |
934 | bfd *pbfd = psect->owner; | |
935 | ||
936 | if ((bfd_get_section_flags (pbfd, psect) & (SEC_ALLOC | SEC_LOAD)) | |
937 | != (SEC_ALLOC | SEC_LOAD)) | |
938 | continue; | |
939 | ||
940 | if (bfd_get_section_vma (pbfd, psect) <= abfd->start_address | |
941 | && abfd->start_address < (bfd_get_section_vma (pbfd, psect) | |
942 | + bfd_get_section_size (psect))) | |
943 | { | |
944 | displacement = p->addr - bfd_get_section_vma (pbfd, psect); | |
945 | break; | |
946 | } | |
947 | } | |
948 | if (p == t->sections_end) | |
949 | warning (_("Cannot find section for the entry point of %s."), | |
950 | bfd_get_filename (abfd)); | |
951 | ||
952 | entry_point = gdbarch_addr_bits_remove (gdbarch, | |
953 | bfd_get_start_address (abfd) | |
954 | + displacement); | |
955 | printf_filtered (_("\tEntry point: %s\n"), | |
956 | paddress (gdbarch, entry_point)); | |
957 | } | |
958 | for (p = t->sections; p < t->sections_end; p++) | |
959 | { | |
960 | struct bfd_section *psect = p->the_bfd_section; | |
961 | bfd *pbfd = psect->owner; | |
962 | ||
963 | printf_filtered ("\t%s", hex_string_custom (p->addr, wid)); | |
964 | printf_filtered (" - %s", hex_string_custom (p->endaddr, wid)); | |
965 | ||
966 | /* FIXME: A format of "08l" is not wide enough for file offsets | |
967 | larger than 4GB. OTOH, making it "016l" isn't desirable either | |
968 | since most output will then be much wider than necessary. It | |
969 | may make sense to test the size of the file and choose the | |
970 | format string accordingly. */ | |
971 | /* FIXME: i18n: Need to rewrite this sentence. */ | |
972 | if (info_verbose) | |
973 | printf_filtered (" @ %s", | |
974 | hex_string_custom (psect->filepos, 8)); | |
975 | printf_filtered (" is %s", bfd_section_name (pbfd, psect)); | |
976 | if (pbfd != abfd) | |
977 | printf_filtered (" in %s", bfd_get_filename (pbfd)); | |
978 | printf_filtered ("\n"); | |
979 | } | |
980 | } | |
981 | ||
982 | static void | |
983 | exec_files_info (struct target_ops *t) | |
984 | { | |
985 | if (exec_bfd) | |
986 | print_section_info (current_target_sections, exec_bfd); | |
987 | else | |
988 | puts_filtered (_("\t<no file loaded>\n")); | |
989 | } | |
990 | ||
991 | static void | |
992 | set_section_command (char *args, int from_tty) | |
993 | { | |
994 | struct target_section *p; | |
995 | char *secname; | |
996 | unsigned seclen; | |
997 | unsigned long secaddr; | |
998 | char secprint[100]; | |
999 | long offset; | |
1000 | struct target_section_table *table; | |
1001 | ||
1002 | if (args == 0) | |
1003 | error (_("Must specify section name and its virtual address")); | |
1004 | ||
1005 | /* Parse out section name. */ | |
1006 | for (secname = args; !isspace (*args); args++); | |
1007 | seclen = args - secname; | |
1008 | ||
1009 | /* Parse out new virtual address. */ | |
1010 | secaddr = parse_and_eval_address (args); | |
1011 | ||
1012 | table = current_target_sections; | |
1013 | for (p = table->sections; p < table->sections_end; p++) | |
1014 | { | |
1015 | if (!strncmp (secname, bfd_section_name (p->bfd, | |
1016 | p->the_bfd_section), seclen) | |
1017 | && bfd_section_name (p->bfd, p->the_bfd_section)[seclen] == '\0') | |
1018 | { | |
1019 | offset = secaddr - p->addr; | |
1020 | p->addr += offset; | |
1021 | p->endaddr += offset; | |
1022 | if (from_tty) | |
1023 | exec_files_info (&exec_ops); | |
1024 | return; | |
1025 | } | |
1026 | } | |
1027 | if (seclen >= sizeof (secprint)) | |
1028 | seclen = sizeof (secprint) - 1; | |
1029 | strncpy (secprint, secname, seclen); | |
1030 | secprint[seclen] = '\0'; | |
1031 | error (_("Section %s not found"), secprint); | |
1032 | } | |
1033 | ||
1034 | /* If we can find a section in FILENAME with BFD index INDEX, adjust | |
1035 | it to ADDRESS. */ | |
1036 | ||
1037 | void | |
1038 | exec_set_section_address (const char *filename, int index, CORE_ADDR address) | |
1039 | { | |
1040 | struct target_section *p; | |
1041 | struct target_section_table *table; | |
1042 | ||
1043 | table = current_target_sections; | |
1044 | for (p = table->sections; p < table->sections_end; p++) | |
1045 | { | |
1046 | if (filename_cmp (filename, p->the_bfd_section->owner->filename) == 0 | |
1047 | && index == p->the_bfd_section->index) | |
1048 | { | |
1049 | p->endaddr += address - p->addr; | |
1050 | p->addr = address; | |
1051 | } | |
1052 | } | |
1053 | } | |
1054 | ||
1055 | /* If mourn is being called in all the right places, this could be say | |
1056 | `gdb internal error' (since generic_mourn calls | |
1057 | breakpoint_init_inferior). */ | |
1058 | ||
1059 | static int | |
1060 | ignore (struct target_ops *ops, struct gdbarch *gdbarch, | |
1061 | struct bp_target_info *bp_tgt) | |
1062 | { | |
1063 | return 0; | |
1064 | } | |
1065 | ||
1066 | /* Implement the to_remove_breakpoint method. */ | |
1067 | ||
1068 | static int | |
1069 | exec_remove_breakpoint (struct target_ops *ops, struct gdbarch *gdbarch, | |
1070 | struct bp_target_info *bp_tgt, | |
1071 | enum remove_bp_reason reason) | |
1072 | { | |
1073 | return 0; | |
1074 | } | |
1075 | ||
1076 | static int | |
1077 | exec_has_memory (struct target_ops *ops) | |
1078 | { | |
1079 | /* We can provide memory if we have any file/target sections to read | |
1080 | from. */ | |
1081 | return (current_target_sections->sections | |
1082 | != current_target_sections->sections_end); | |
1083 | } | |
1084 | ||
1085 | static char * | |
1086 | exec_make_note_section (struct target_ops *self, bfd *obfd, int *note_size) | |
1087 | { | |
1088 | error (_("Can't create a corefile")); | |
1089 | } | |
1090 | ||
1091 | /* Fill in the exec file target vector. Very few entries need to be | |
1092 | defined. */ | |
1093 | ||
1094 | static void | |
1095 | init_exec_ops (void) | |
1096 | { | |
1097 | exec_ops.to_shortname = "exec"; | |
1098 | exec_ops.to_longname = "Local exec file"; | |
1099 | exec_ops.to_doc = "Use an executable file as a target.\n\ | |
1100 | Specify the filename of the executable file."; | |
1101 | exec_ops.to_open = exec_open; | |
1102 | exec_ops.to_close = exec_close_1; | |
1103 | exec_ops.to_xfer_partial = exec_xfer_partial; | |
1104 | exec_ops.to_get_section_table = exec_get_section_table; | |
1105 | exec_ops.to_files_info = exec_files_info; | |
1106 | exec_ops.to_insert_breakpoint = ignore; | |
1107 | exec_ops.to_remove_breakpoint = exec_remove_breakpoint; | |
1108 | exec_ops.to_stratum = file_stratum; | |
1109 | exec_ops.to_has_memory = exec_has_memory; | |
1110 | exec_ops.to_make_corefile_notes = exec_make_note_section; | |
1111 | exec_ops.to_find_memory_regions = objfile_find_memory_regions; | |
1112 | exec_ops.to_magic = OPS_MAGIC; | |
1113 | } | |
1114 | ||
1115 | void | |
1116 | _initialize_exec (void) | |
1117 | { | |
1118 | struct cmd_list_element *c; | |
1119 | ||
1120 | init_exec_ops (); | |
1121 | ||
1122 | if (!dbx_commands) | |
1123 | { | |
1124 | c = add_cmd ("file", class_files, file_command, _("\ | |
1125 | Use FILE as program to be debugged.\n\ | |
1126 | It is read for its symbols, for getting the contents of pure memory,\n\ | |
1127 | and it is the program executed when you use the `run' command.\n\ | |
1128 | If FILE cannot be found as specified, your execution directory path\n\ | |
1129 | ($PATH) is searched for a command of that name.\n\ | |
1130 | No arg means to have no executable file and no symbols."), &cmdlist); | |
1131 | set_cmd_completer (c, filename_completer); | |
1132 | } | |
1133 | ||
1134 | c = add_cmd ("exec-file", class_files, exec_file_command, _("\ | |
1135 | Use FILE as program for getting contents of pure memory.\n\ | |
1136 | If FILE cannot be found as specified, your execution directory path\n\ | |
1137 | is searched for a command of that name.\n\ | |
1138 | No arg means have no executable file."), &cmdlist); | |
1139 | set_cmd_completer (c, filename_completer); | |
1140 | ||
1141 | add_com ("section", class_files, set_section_command, _("\ | |
1142 | Change the base address of section SECTION of the exec file to ADDR.\n\ | |
1143 | This can be used if the exec file does not contain section addresses,\n\ | |
1144 | (such as in the a.out format), or when the addresses specified in the\n\ | |
1145 | file itself are wrong. Each section must be changed separately. The\n\ | |
1146 | ``info files'' command lists all the sections and their addresses.")); | |
1147 | ||
1148 | add_setshow_boolean_cmd ("write", class_support, &write_files, _("\ | |
1149 | Set writing into executable and core files."), _("\ | |
1150 | Show writing into executable and core files."), NULL, | |
1151 | NULL, | |
1152 | show_write_files, | |
1153 | &setlist, &showlist); | |
1154 | ||
1155 | add_target_with_completer (&exec_ops, filename_completer); | |
1156 | } |