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1 | /* Work with executable files, for GDB. | |
2 | ||
3 | Copyright (C) 1988-2018 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 "observable.h" | |
33 | #include "arch-utils.h" | |
34 | #include "gdbthread.h" | |
35 | #include "progspace.h" | |
36 | #include "gdb_bfd.h" | |
37 | #include "gcore.h" | |
38 | #include "source.h" | |
39 | ||
40 | #include <fcntl.h> | |
41 | #include "readline/readline.h" | |
42 | #include "gdbcore.h" | |
43 | ||
44 | #include <ctype.h> | |
45 | #include <sys/stat.h> | |
46 | #include "solist.h" | |
47 | #include <algorithm> | |
48 | #include "common/pathstuff.h" | |
49 | ||
50 | void (*deprecated_file_changed_hook) (const char *); | |
51 | ||
52 | /* The target vector for executable files. */ | |
53 | ||
54 | struct exec_target final : public target_ops | |
55 | { | |
56 | exec_target () | |
57 | { to_stratum = file_stratum; } | |
58 | ||
59 | const char *shortname () override | |
60 | { return "exec"; } | |
61 | ||
62 | const char *longname () override | |
63 | { return _("Local exec file"); } | |
64 | ||
65 | const char *doc () override | |
66 | { | |
67 | return _("\ | |
68 | Use an executable file as a target.\n\ | |
69 | Specify the filename of the executable file."); | |
70 | } | |
71 | ||
72 | void open (const char *, int) override; | |
73 | void close () override; | |
74 | enum target_xfer_status xfer_partial (enum target_object object, | |
75 | const char *annex, | |
76 | gdb_byte *readbuf, | |
77 | const gdb_byte *writebuf, | |
78 | ULONGEST offset, ULONGEST len, | |
79 | ULONGEST *xfered_len) override; | |
80 | struct target_section_table *get_section_table () override; | |
81 | void files_info () override; | |
82 | ||
83 | int has_memory () override; | |
84 | char *make_corefile_notes (bfd *, int *) override; | |
85 | int find_memory_regions (find_memory_region_ftype func, void *data) override; | |
86 | }; | |
87 | ||
88 | static exec_target exec_ops; | |
89 | ||
90 | /* Whether to open exec and core files read-only or read-write. */ | |
91 | ||
92 | int write_files = 0; | |
93 | static void | |
94 | show_write_files (struct ui_file *file, int from_tty, | |
95 | struct cmd_list_element *c, const char *value) | |
96 | { | |
97 | fprintf_filtered (file, _("Writing into executable and core files is %s.\n"), | |
98 | value); | |
99 | } | |
100 | ||
101 | ||
102 | void | |
103 | exec_target::open (const char *args, int from_tty) | |
104 | { | |
105 | target_preopen (from_tty); | |
106 | exec_file_attach (args, from_tty); | |
107 | } | |
108 | ||
109 | /* Close and clear exec_bfd. If we end up with no target sections to | |
110 | read memory from, this unpushes the exec_ops target. */ | |
111 | ||
112 | void | |
113 | exec_close (void) | |
114 | { | |
115 | if (exec_bfd) | |
116 | { | |
117 | bfd *abfd = exec_bfd; | |
118 | ||
119 | gdb_bfd_unref (abfd); | |
120 | ||
121 | /* Removing target sections may close the exec_ops target. | |
122 | Clear exec_bfd before doing so to prevent recursion. */ | |
123 | exec_bfd = NULL; | |
124 | exec_bfd_mtime = 0; | |
125 | ||
126 | remove_target_sections (&exec_bfd); | |
127 | ||
128 | xfree (exec_filename); | |
129 | exec_filename = NULL; | |
130 | } | |
131 | } | |
132 | ||
133 | /* This is the target_close implementation. Clears all target | |
134 | sections and closes all executable bfds from all program spaces. */ | |
135 | ||
136 | void | |
137 | exec_target::close () | |
138 | { | |
139 | struct program_space *ss; | |
140 | scoped_restore_current_program_space restore_pspace; | |
141 | ||
142 | ALL_PSPACES (ss) | |
143 | { | |
144 | set_current_program_space (ss); | |
145 | clear_section_table (current_target_sections); | |
146 | exec_close (); | |
147 | } | |
148 | } | |
149 | ||
150 | /* See gdbcore.h. */ | |
151 | ||
152 | void | |
153 | try_open_exec_file (const char *exec_file_host, struct inferior *inf, | |
154 | symfile_add_flags add_flags) | |
155 | { | |
156 | struct cleanup *old_chain; | |
157 | struct gdb_exception prev_err = exception_none; | |
158 | ||
159 | old_chain = make_cleanup (free_current_contents, &prev_err.message); | |
160 | ||
161 | /* exec_file_attach and symbol_file_add_main may throw an error if the file | |
162 | cannot be opened either locally or remotely. | |
163 | ||
164 | This happens for example, when the file is first found in the local | |
165 | sysroot (above), and then disappears (a TOCTOU race), or when it doesn't | |
166 | exist in the target filesystem, or when the file does exist, but | |
167 | is not readable. | |
168 | ||
169 | Even without a symbol file, the remote-based debugging session should | |
170 | continue normally instead of ending abruptly. Hence we catch thrown | |
171 | errors/exceptions in the following code. */ | |
172 | TRY | |
173 | { | |
174 | /* We must do this step even if exec_file_host is NULL, so that | |
175 | exec_file_attach will clear state. */ | |
176 | exec_file_attach (exec_file_host, add_flags & SYMFILE_VERBOSE); | |
177 | } | |
178 | CATCH (err, RETURN_MASK_ERROR) | |
179 | { | |
180 | if (err.message != NULL) | |
181 | warning ("%s", err.message); | |
182 | ||
183 | prev_err = err; | |
184 | ||
185 | /* Save message so it doesn't get trashed by the catch below. */ | |
186 | if (err.message != NULL) | |
187 | prev_err.message = xstrdup (err.message); | |
188 | } | |
189 | END_CATCH | |
190 | ||
191 | if (exec_file_host != NULL) | |
192 | { | |
193 | TRY | |
194 | { | |
195 | symbol_file_add_main (exec_file_host, add_flags); | |
196 | } | |
197 | CATCH (err, RETURN_MASK_ERROR) | |
198 | { | |
199 | if (!exception_print_same (prev_err, err)) | |
200 | warning ("%s", err.message); | |
201 | } | |
202 | END_CATCH | |
203 | } | |
204 | ||
205 | do_cleanups (old_chain); | |
206 | } | |
207 | ||
208 | /* See gdbcore.h. */ | |
209 | ||
210 | void | |
211 | exec_file_locate_attach (int pid, int defer_bp_reset, int from_tty) | |
212 | { | |
213 | char *exec_file_target; | |
214 | symfile_add_flags add_flags = 0; | |
215 | ||
216 | /* Do nothing if we already have an executable filename. */ | |
217 | if (get_exec_file (0) != NULL) | |
218 | return; | |
219 | ||
220 | /* Try to determine a filename from the process itself. */ | |
221 | exec_file_target = target_pid_to_exec_file (pid); | |
222 | if (exec_file_target == NULL) | |
223 | { | |
224 | warning (_("No executable has been specified and target does not " | |
225 | "support\n" | |
226 | "determining executable automatically. " | |
227 | "Try using the \"file\" command.")); | |
228 | return; | |
229 | } | |
230 | ||
231 | gdb::unique_xmalloc_ptr<char> exec_file_host | |
232 | = exec_file_find (exec_file_target, NULL); | |
233 | ||
234 | if (defer_bp_reset) | |
235 | add_flags |= SYMFILE_DEFER_BP_RESET; | |
236 | ||
237 | if (from_tty) | |
238 | add_flags |= SYMFILE_VERBOSE; | |
239 | ||
240 | /* Attempt to open the exec file. */ | |
241 | try_open_exec_file (exec_file_host.get (), current_inferior (), add_flags); | |
242 | } | |
243 | ||
244 | /* Set FILENAME as the new exec file. | |
245 | ||
246 | This function is intended to be behave essentially the same | |
247 | as exec_file_command, except that the latter will detect when | |
248 | a target is being debugged, and will ask the user whether it | |
249 | should be shut down first. (If the answer is "no", then the | |
250 | new file is ignored.) | |
251 | ||
252 | This file is used by exec_file_command, to do the work of opening | |
253 | and processing the exec file after any prompting has happened. | |
254 | ||
255 | And, it is used by child_attach, when the attach command was | |
256 | given a pid but not a exec pathname, and the attach command could | |
257 | figure out the pathname from the pid. (In this case, we shouldn't | |
258 | ask the user whether the current target should be shut down -- | |
259 | we're supplying the exec pathname late for good reason.) */ | |
260 | ||
261 | void | |
262 | exec_file_attach (const char *filename, int from_tty) | |
263 | { | |
264 | /* First, acquire a reference to the current exec_bfd. We release | |
265 | this at the end of the function; but acquiring it now lets the | |
266 | BFD cache return it if this call refers to the same file. */ | |
267 | gdb_bfd_ref_ptr exec_bfd_holder = gdb_bfd_ref_ptr::new_reference (exec_bfd); | |
268 | ||
269 | /* Remove any previous exec file. */ | |
270 | exec_close (); | |
271 | ||
272 | /* Now open and digest the file the user requested, if any. */ | |
273 | ||
274 | if (!filename) | |
275 | { | |
276 | if (from_tty) | |
277 | printf_unfiltered (_("No executable file now.\n")); | |
278 | ||
279 | set_gdbarch_from_file (NULL); | |
280 | } | |
281 | else | |
282 | { | |
283 | int load_via_target = 0; | |
284 | const char *scratch_pathname, *canonical_pathname; | |
285 | int scratch_chan; | |
286 | struct target_section *sections = NULL, *sections_end = NULL; | |
287 | char **matching; | |
288 | ||
289 | if (is_target_filename (filename)) | |
290 | { | |
291 | if (target_filesystem_is_local ()) | |
292 | filename += strlen (TARGET_SYSROOT_PREFIX); | |
293 | else | |
294 | load_via_target = 1; | |
295 | } | |
296 | ||
297 | gdb::unique_xmalloc_ptr<char> canonical_storage, scratch_storage; | |
298 | if (load_via_target) | |
299 | { | |
300 | /* gdb_bfd_fopen does not support "target:" filenames. */ | |
301 | if (write_files) | |
302 | warning (_("writing into executable files is " | |
303 | "not supported for %s sysroots"), | |
304 | TARGET_SYSROOT_PREFIX); | |
305 | ||
306 | scratch_pathname = filename; | |
307 | scratch_chan = -1; | |
308 | canonical_pathname = scratch_pathname; | |
309 | } | |
310 | else | |
311 | { | |
312 | scratch_chan = openp (getenv ("PATH"), OPF_TRY_CWD_FIRST, | |
313 | filename, write_files ? | |
314 | O_RDWR | O_BINARY : O_RDONLY | O_BINARY, | |
315 | &scratch_storage); | |
316 | #if defined(__GO32__) || defined(_WIN32) || defined(__CYGWIN__) | |
317 | if (scratch_chan < 0) | |
318 | { | |
319 | char *exename = (char *) alloca (strlen (filename) + 5); | |
320 | ||
321 | strcat (strcpy (exename, filename), ".exe"); | |
322 | scratch_chan = openp (getenv ("PATH"), OPF_TRY_CWD_FIRST, | |
323 | exename, write_files ? | |
324 | O_RDWR | O_BINARY | |
325 | : O_RDONLY | O_BINARY, | |
326 | &scratch_storage); | |
327 | } | |
328 | #endif | |
329 | if (scratch_chan < 0) | |
330 | perror_with_name (filename); | |
331 | ||
332 | scratch_pathname = scratch_storage.get (); | |
333 | ||
334 | /* gdb_bfd_open (and its variants) prefers canonicalized | |
335 | pathname for better BFD caching. */ | |
336 | canonical_storage = gdb_realpath (scratch_pathname); | |
337 | canonical_pathname = canonical_storage.get (); | |
338 | } | |
339 | ||
340 | gdb_bfd_ref_ptr temp; | |
341 | if (write_files && !load_via_target) | |
342 | temp = gdb_bfd_fopen (canonical_pathname, gnutarget, | |
343 | FOPEN_RUB, scratch_chan); | |
344 | else | |
345 | temp = gdb_bfd_open (canonical_pathname, gnutarget, scratch_chan); | |
346 | exec_bfd = temp.release (); | |
347 | ||
348 | if (!exec_bfd) | |
349 | { | |
350 | error (_("\"%s\": could not open as an executable file: %s."), | |
351 | scratch_pathname, bfd_errmsg (bfd_get_error ())); | |
352 | } | |
353 | ||
354 | /* gdb_realpath_keepfile resolves symlinks on the local | |
355 | filesystem and so cannot be used for "target:" files. */ | |
356 | gdb_assert (exec_filename == NULL); | |
357 | if (load_via_target) | |
358 | exec_filename = xstrdup (bfd_get_filename (exec_bfd)); | |
359 | else | |
360 | exec_filename = gdb_realpath_keepfile (scratch_pathname).release (); | |
361 | ||
362 | if (!bfd_check_format_matches (exec_bfd, bfd_object, &matching)) | |
363 | { | |
364 | /* Make sure to close exec_bfd, or else "run" might try to use | |
365 | it. */ | |
366 | exec_close (); | |
367 | error (_("\"%s\": not in executable format: %s"), | |
368 | scratch_pathname, | |
369 | gdb_bfd_errmsg (bfd_get_error (), matching)); | |
370 | } | |
371 | ||
372 | if (build_section_table (exec_bfd, §ions, §ions_end)) | |
373 | { | |
374 | /* Make sure to close exec_bfd, or else "run" might try to use | |
375 | it. */ | |
376 | exec_close (); | |
377 | error (_("\"%s\": can't find the file sections: %s"), | |
378 | scratch_pathname, bfd_errmsg (bfd_get_error ())); | |
379 | } | |
380 | ||
381 | exec_bfd_mtime = bfd_get_mtime (exec_bfd); | |
382 | ||
383 | validate_files (); | |
384 | ||
385 | set_gdbarch_from_file (exec_bfd); | |
386 | ||
387 | /* Add the executable's sections to the current address spaces' | |
388 | list of sections. This possibly pushes the exec_ops | |
389 | target. */ | |
390 | add_target_sections (&exec_bfd, sections, sections_end); | |
391 | xfree (sections); | |
392 | ||
393 | /* Tell display code (if any) about the changed file name. */ | |
394 | if (deprecated_exec_file_display_hook) | |
395 | (*deprecated_exec_file_display_hook) (filename); | |
396 | } | |
397 | ||
398 | bfd_cache_close_all (); | |
399 | gdb::observers::executable_changed.notify (); | |
400 | } | |
401 | ||
402 | /* Process the first arg in ARGS as the new exec file. | |
403 | ||
404 | Note that we have to explicitly ignore additional args, since we can | |
405 | be called from file_command(), which also calls symbol_file_command() | |
406 | which can take multiple args. | |
407 | ||
408 | If ARGS is NULL, we just want to close the exec file. */ | |
409 | ||
410 | static void | |
411 | exec_file_command (const char *args, int from_tty) | |
412 | { | |
413 | if (from_tty && target_has_execution | |
414 | && !query (_("A program is being debugged already.\n" | |
415 | "Are you sure you want to change the file? "))) | |
416 | error (_("File not changed.")); | |
417 | ||
418 | if (args) | |
419 | { | |
420 | /* Scan through the args and pick up the first non option arg | |
421 | as the filename. */ | |
422 | ||
423 | gdb_argv built_argv (args); | |
424 | char **argv = built_argv.get (); | |
425 | ||
426 | for (; (*argv != NULL) && (**argv == '-'); argv++) | |
427 | {; | |
428 | } | |
429 | if (*argv == NULL) | |
430 | error (_("No executable file name was specified")); | |
431 | ||
432 | gdb::unique_xmalloc_ptr<char> filename (tilde_expand (*argv)); | |
433 | exec_file_attach (filename.get (), from_tty); | |
434 | } | |
435 | else | |
436 | exec_file_attach (NULL, from_tty); | |
437 | } | |
438 | ||
439 | /* Set both the exec file and the symbol file, in one command. | |
440 | What a novelty. Why did GDB go through four major releases before this | |
441 | command was added? */ | |
442 | ||
443 | static void | |
444 | file_command (const char *arg, int from_tty) | |
445 | { | |
446 | /* FIXME, if we lose on reading the symbol file, we should revert | |
447 | the exec file, but that's rough. */ | |
448 | exec_file_command (arg, from_tty); | |
449 | symbol_file_command (arg, from_tty); | |
450 | if (deprecated_file_changed_hook) | |
451 | deprecated_file_changed_hook (arg); | |
452 | } | |
453 | \f | |
454 | ||
455 | /* Locate all mappable sections of a BFD file. | |
456 | table_pp_char is a char * to get it through bfd_map_over_sections; | |
457 | we cast it back to its proper type. */ | |
458 | ||
459 | static void | |
460 | add_to_section_table (bfd *abfd, struct bfd_section *asect, | |
461 | void *table_pp_char) | |
462 | { | |
463 | struct target_section **table_pp = (struct target_section **) table_pp_char; | |
464 | flagword aflag; | |
465 | ||
466 | gdb_assert (abfd == asect->owner); | |
467 | ||
468 | /* Check the section flags, but do not discard zero-length sections, since | |
469 | some symbols may still be attached to this section. For instance, we | |
470 | encountered on sparc-solaris 2.10 a shared library with an empty .bss | |
471 | section to which a symbol named "_end" was attached. The address | |
472 | of this symbol still needs to be relocated. */ | |
473 | aflag = bfd_get_section_flags (abfd, asect); | |
474 | if (!(aflag & SEC_ALLOC)) | |
475 | return; | |
476 | ||
477 | (*table_pp)->owner = NULL; | |
478 | (*table_pp)->the_bfd_section = asect; | |
479 | (*table_pp)->addr = bfd_section_vma (abfd, asect); | |
480 | (*table_pp)->endaddr = (*table_pp)->addr + bfd_section_size (abfd, asect); | |
481 | (*table_pp)++; | |
482 | } | |
483 | ||
484 | /* See exec.h. */ | |
485 | ||
486 | void | |
487 | clear_section_table (struct target_section_table *table) | |
488 | { | |
489 | xfree (table->sections); | |
490 | table->sections = table->sections_end = NULL; | |
491 | } | |
492 | ||
493 | /* Resize section table TABLE by ADJUSTMENT. | |
494 | ADJUSTMENT may be negative, in which case the caller must have already | |
495 | removed the sections being deleted. | |
496 | Returns the old size. */ | |
497 | ||
498 | static int | |
499 | resize_section_table (struct target_section_table *table, int adjustment) | |
500 | { | |
501 | int old_count; | |
502 | int new_count; | |
503 | ||
504 | old_count = table->sections_end - table->sections; | |
505 | ||
506 | new_count = adjustment + old_count; | |
507 | ||
508 | if (new_count) | |
509 | { | |
510 | table->sections = XRESIZEVEC (struct target_section, table->sections, | |
511 | new_count); | |
512 | table->sections_end = table->sections + new_count; | |
513 | } | |
514 | else | |
515 | clear_section_table (table); | |
516 | ||
517 | return old_count; | |
518 | } | |
519 | ||
520 | /* Builds a section table, given args BFD, SECTABLE_PTR, SECEND_PTR. | |
521 | Returns 0 if OK, 1 on error. */ | |
522 | ||
523 | int | |
524 | build_section_table (struct bfd *some_bfd, struct target_section **start, | |
525 | struct target_section **end) | |
526 | { | |
527 | unsigned count; | |
528 | ||
529 | count = bfd_count_sections (some_bfd); | |
530 | if (*start) | |
531 | xfree (* start); | |
532 | *start = XNEWVEC (struct target_section, count); | |
533 | *end = *start; | |
534 | bfd_map_over_sections (some_bfd, add_to_section_table, (char *) end); | |
535 | if (*end > *start + count) | |
536 | internal_error (__FILE__, __LINE__, | |
537 | _("failed internal consistency check")); | |
538 | /* We could realloc the table, but it probably loses for most files. */ | |
539 | return 0; | |
540 | } | |
541 | ||
542 | /* Add the sections array defined by [SECTIONS..SECTIONS_END[ to the | |
543 | current set of target sections. */ | |
544 | ||
545 | void | |
546 | add_target_sections (void *owner, | |
547 | struct target_section *sections, | |
548 | struct target_section *sections_end) | |
549 | { | |
550 | int count; | |
551 | struct target_section_table *table = current_target_sections; | |
552 | ||
553 | count = sections_end - sections; | |
554 | ||
555 | if (count > 0) | |
556 | { | |
557 | int space = resize_section_table (table, count); | |
558 | int i; | |
559 | ||
560 | for (i = 0; i < count; ++i) | |
561 | { | |
562 | table->sections[space + i] = sections[i]; | |
563 | table->sections[space + i].owner = owner; | |
564 | } | |
565 | ||
566 | /* If these are the first file sections we can provide memory | |
567 | from, push the file_stratum target. */ | |
568 | if (!target_is_pushed (&exec_ops)) | |
569 | push_target (&exec_ops); | |
570 | } | |
571 | } | |
572 | ||
573 | /* Add the sections of OBJFILE to the current set of target sections. */ | |
574 | ||
575 | void | |
576 | add_target_sections_of_objfile (struct objfile *objfile) | |
577 | { | |
578 | struct target_section_table *table = current_target_sections; | |
579 | struct obj_section *osect; | |
580 | int space; | |
581 | unsigned count = 0; | |
582 | struct target_section *ts; | |
583 | ||
584 | if (objfile == NULL) | |
585 | return; | |
586 | ||
587 | /* Compute the number of sections to add. */ | |
588 | ALL_OBJFILE_OSECTIONS (objfile, osect) | |
589 | { | |
590 | if (bfd_get_section_size (osect->the_bfd_section) == 0) | |
591 | continue; | |
592 | count++; | |
593 | } | |
594 | ||
595 | if (count == 0) | |
596 | return; | |
597 | ||
598 | space = resize_section_table (table, count); | |
599 | ||
600 | ts = table->sections + space; | |
601 | ||
602 | ALL_OBJFILE_OSECTIONS (objfile, osect) | |
603 | { | |
604 | if (bfd_get_section_size (osect->the_bfd_section) == 0) | |
605 | continue; | |
606 | ||
607 | gdb_assert (ts < table->sections + space + count); | |
608 | ||
609 | ts->addr = obj_section_addr (osect); | |
610 | ts->endaddr = obj_section_endaddr (osect); | |
611 | ts->the_bfd_section = osect->the_bfd_section; | |
612 | ts->owner = (void *) objfile; | |
613 | ||
614 | ts++; | |
615 | } | |
616 | } | |
617 | ||
618 | /* Remove all target sections owned by OWNER. | |
619 | OWNER must be the same value passed to add_target_sections. */ | |
620 | ||
621 | void | |
622 | remove_target_sections (void *owner) | |
623 | { | |
624 | struct target_section *src, *dest; | |
625 | struct target_section_table *table = current_target_sections; | |
626 | ||
627 | gdb_assert (owner != NULL); | |
628 | ||
629 | dest = table->sections; | |
630 | for (src = table->sections; src < table->sections_end; src++) | |
631 | if (src->owner != owner) | |
632 | { | |
633 | /* Keep this section. */ | |
634 | if (dest < src) | |
635 | *dest = *src; | |
636 | dest++; | |
637 | } | |
638 | ||
639 | /* If we've dropped any sections, resize the section table. */ | |
640 | if (dest < src) | |
641 | { | |
642 | int old_count; | |
643 | ||
644 | old_count = resize_section_table (table, dest - src); | |
645 | ||
646 | /* If we don't have any more sections to read memory from, | |
647 | remove the file_stratum target from the stack. */ | |
648 | if (old_count + (dest - src) == 0) | |
649 | { | |
650 | struct program_space *pspace; | |
651 | ||
652 | ALL_PSPACES (pspace) | |
653 | if (pspace->target_sections.sections | |
654 | != pspace->target_sections.sections_end) | |
655 | return; | |
656 | ||
657 | unpush_target (&exec_ops); | |
658 | } | |
659 | } | |
660 | } | |
661 | ||
662 | \f | |
663 | ||
664 | enum target_xfer_status | |
665 | exec_read_partial_read_only (gdb_byte *readbuf, ULONGEST offset, | |
666 | ULONGEST len, ULONGEST *xfered_len) | |
667 | { | |
668 | /* It's unduly pedantic to refuse to look at the executable for | |
669 | read-only pieces; so do the equivalent of readonly regions aka | |
670 | QTro packet. */ | |
671 | if (exec_bfd != NULL) | |
672 | { | |
673 | asection *s; | |
674 | bfd_size_type size; | |
675 | bfd_vma vma; | |
676 | ||
677 | for (s = exec_bfd->sections; s; s = s->next) | |
678 | { | |
679 | if ((s->flags & SEC_LOAD) == 0 | |
680 | || (s->flags & SEC_READONLY) == 0) | |
681 | continue; | |
682 | ||
683 | vma = s->vma; | |
684 | size = bfd_get_section_size (s); | |
685 | if (vma <= offset && offset < (vma + size)) | |
686 | { | |
687 | ULONGEST amt; | |
688 | ||
689 | amt = (vma + size) - offset; | |
690 | if (amt > len) | |
691 | amt = len; | |
692 | ||
693 | amt = bfd_get_section_contents (exec_bfd, s, | |
694 | readbuf, offset - vma, amt); | |
695 | ||
696 | if (amt == 0) | |
697 | return TARGET_XFER_EOF; | |
698 | else | |
699 | { | |
700 | *xfered_len = amt; | |
701 | return TARGET_XFER_OK; | |
702 | } | |
703 | } | |
704 | } | |
705 | } | |
706 | ||
707 | /* Indicate failure to find the requested memory block. */ | |
708 | return TARGET_XFER_E_IO; | |
709 | } | |
710 | ||
711 | /* Return all read-only memory ranges found in the target section | |
712 | table defined by SECTIONS and SECTIONS_END, starting at (and | |
713 | intersected with) MEMADDR for LEN bytes. */ | |
714 | ||
715 | static std::vector<mem_range> | |
716 | section_table_available_memory (CORE_ADDR memaddr, ULONGEST len, | |
717 | struct target_section *sections, | |
718 | struct target_section *sections_end) | |
719 | { | |
720 | std::vector<mem_range> memory; | |
721 | ||
722 | for (target_section *p = sections; p < sections_end; p++) | |
723 | { | |
724 | if ((bfd_get_section_flags (p->the_bfd_section->owner, | |
725 | p->the_bfd_section) | |
726 | & SEC_READONLY) == 0) | |
727 | continue; | |
728 | ||
729 | /* Copy the meta-data, adjusted. */ | |
730 | if (mem_ranges_overlap (p->addr, p->endaddr - p->addr, memaddr, len)) | |
731 | { | |
732 | ULONGEST lo1, hi1, lo2, hi2; | |
733 | ||
734 | lo1 = memaddr; | |
735 | hi1 = memaddr + len; | |
736 | ||
737 | lo2 = p->addr; | |
738 | hi2 = p->endaddr; | |
739 | ||
740 | CORE_ADDR start = std::max (lo1, lo2); | |
741 | int length = std::min (hi1, hi2) - start; | |
742 | ||
743 | memory.emplace_back (start, length); | |
744 | } | |
745 | } | |
746 | ||
747 | return memory; | |
748 | } | |
749 | ||
750 | enum target_xfer_status | |
751 | section_table_read_available_memory (gdb_byte *readbuf, ULONGEST offset, | |
752 | ULONGEST len, ULONGEST *xfered_len) | |
753 | { | |
754 | target_section_table *table = target_get_section_table (&exec_ops); | |
755 | std::vector<mem_range> available_memory | |
756 | = section_table_available_memory (offset, len, | |
757 | table->sections, table->sections_end); | |
758 | ||
759 | normalize_mem_ranges (&available_memory); | |
760 | ||
761 | for (const mem_range &r : available_memory) | |
762 | { | |
763 | if (mem_ranges_overlap (r.start, r.length, offset, len)) | |
764 | { | |
765 | CORE_ADDR end; | |
766 | enum target_xfer_status status; | |
767 | ||
768 | /* Get the intersection window. */ | |
769 | end = std::min<CORE_ADDR> (offset + len, r.start + r.length); | |
770 | ||
771 | gdb_assert (end - offset <= len); | |
772 | ||
773 | if (offset >= r.start) | |
774 | status = exec_read_partial_read_only (readbuf, offset, | |
775 | end - offset, | |
776 | xfered_len); | |
777 | else | |
778 | { | |
779 | *xfered_len = r.start - offset; | |
780 | status = TARGET_XFER_UNAVAILABLE; | |
781 | } | |
782 | return status; | |
783 | } | |
784 | } | |
785 | ||
786 | *xfered_len = len; | |
787 | return TARGET_XFER_UNAVAILABLE; | |
788 | } | |
789 | ||
790 | enum target_xfer_status | |
791 | section_table_xfer_memory_partial (gdb_byte *readbuf, const gdb_byte *writebuf, | |
792 | ULONGEST offset, ULONGEST len, | |
793 | ULONGEST *xfered_len, | |
794 | struct target_section *sections, | |
795 | struct target_section *sections_end, | |
796 | const char *section_name) | |
797 | { | |
798 | int res; | |
799 | struct target_section *p; | |
800 | ULONGEST memaddr = offset; | |
801 | ULONGEST memend = memaddr + len; | |
802 | ||
803 | if (len == 0) | |
804 | internal_error (__FILE__, __LINE__, | |
805 | _("failed internal consistency check")); | |
806 | ||
807 | for (p = sections; p < sections_end; p++) | |
808 | { | |
809 | struct bfd_section *asect = p->the_bfd_section; | |
810 | bfd *abfd = asect->owner; | |
811 | ||
812 | if (section_name && strcmp (section_name, asect->name) != 0) | |
813 | continue; /* not the section we need. */ | |
814 | if (memaddr >= p->addr) | |
815 | { | |
816 | if (memend <= p->endaddr) | |
817 | { | |
818 | /* Entire transfer is within this section. */ | |
819 | if (writebuf) | |
820 | res = bfd_set_section_contents (abfd, asect, | |
821 | writebuf, memaddr - p->addr, | |
822 | len); | |
823 | else | |
824 | res = bfd_get_section_contents (abfd, asect, | |
825 | readbuf, memaddr - p->addr, | |
826 | len); | |
827 | ||
828 | if (res != 0) | |
829 | { | |
830 | *xfered_len = len; | |
831 | return TARGET_XFER_OK; | |
832 | } | |
833 | else | |
834 | return TARGET_XFER_EOF; | |
835 | } | |
836 | else if (memaddr >= p->endaddr) | |
837 | { | |
838 | /* This section ends before the transfer starts. */ | |
839 | continue; | |
840 | } | |
841 | else | |
842 | { | |
843 | /* This section overlaps the transfer. Just do half. */ | |
844 | len = p->endaddr - memaddr; | |
845 | if (writebuf) | |
846 | res = bfd_set_section_contents (abfd, asect, | |
847 | writebuf, memaddr - p->addr, | |
848 | len); | |
849 | else | |
850 | res = bfd_get_section_contents (abfd, asect, | |
851 | readbuf, memaddr - p->addr, | |
852 | len); | |
853 | if (res != 0) | |
854 | { | |
855 | *xfered_len = len; | |
856 | return TARGET_XFER_OK; | |
857 | } | |
858 | else | |
859 | return TARGET_XFER_EOF; | |
860 | } | |
861 | } | |
862 | } | |
863 | ||
864 | return TARGET_XFER_EOF; /* We can't help. */ | |
865 | } | |
866 | ||
867 | struct target_section_table * | |
868 | exec_target::get_section_table () | |
869 | { | |
870 | return current_target_sections; | |
871 | } | |
872 | ||
873 | enum target_xfer_status | |
874 | exec_target::xfer_partial (enum target_object object, | |
875 | const char *annex, gdb_byte *readbuf, | |
876 | const gdb_byte *writebuf, | |
877 | ULONGEST offset, ULONGEST len, ULONGEST *xfered_len) | |
878 | { | |
879 | struct target_section_table *table = get_section_table (); | |
880 | ||
881 | if (object == TARGET_OBJECT_MEMORY) | |
882 | return section_table_xfer_memory_partial (readbuf, writebuf, | |
883 | offset, len, xfered_len, | |
884 | table->sections, | |
885 | table->sections_end, | |
886 | NULL); | |
887 | else | |
888 | return TARGET_XFER_E_IO; | |
889 | } | |
890 | \f | |
891 | ||
892 | void | |
893 | print_section_info (struct target_section_table *t, bfd *abfd) | |
894 | { | |
895 | struct gdbarch *gdbarch = gdbarch_from_bfd (abfd); | |
896 | struct target_section *p; | |
897 | /* FIXME: 16 is not wide enough when gdbarch_addr_bit > 64. */ | |
898 | int wid = gdbarch_addr_bit (gdbarch) <= 32 ? 8 : 16; | |
899 | ||
900 | printf_filtered ("\t`%s', ", bfd_get_filename (abfd)); | |
901 | wrap_here (" "); | |
902 | printf_filtered (_("file type %s.\n"), bfd_get_target (abfd)); | |
903 | if (abfd == exec_bfd) | |
904 | { | |
905 | /* gcc-3.4 does not like the initialization in | |
906 | <p == t->sections_end>. */ | |
907 | bfd_vma displacement = 0; | |
908 | bfd_vma entry_point; | |
909 | ||
910 | for (p = t->sections; p < t->sections_end; p++) | |
911 | { | |
912 | struct bfd_section *psect = p->the_bfd_section; | |
913 | bfd *pbfd = psect->owner; | |
914 | ||
915 | if ((bfd_get_section_flags (pbfd, psect) & (SEC_ALLOC | SEC_LOAD)) | |
916 | != (SEC_ALLOC | SEC_LOAD)) | |
917 | continue; | |
918 | ||
919 | if (bfd_get_section_vma (pbfd, psect) <= abfd->start_address | |
920 | && abfd->start_address < (bfd_get_section_vma (pbfd, psect) | |
921 | + bfd_get_section_size (psect))) | |
922 | { | |
923 | displacement = p->addr - bfd_get_section_vma (pbfd, psect); | |
924 | break; | |
925 | } | |
926 | } | |
927 | if (p == t->sections_end) | |
928 | warning (_("Cannot find section for the entry point of %s."), | |
929 | bfd_get_filename (abfd)); | |
930 | ||
931 | entry_point = gdbarch_addr_bits_remove (gdbarch, | |
932 | bfd_get_start_address (abfd) | |
933 | + displacement); | |
934 | printf_filtered (_("\tEntry point: %s\n"), | |
935 | paddress (gdbarch, entry_point)); | |
936 | } | |
937 | for (p = t->sections; p < t->sections_end; p++) | |
938 | { | |
939 | struct bfd_section *psect = p->the_bfd_section; | |
940 | bfd *pbfd = psect->owner; | |
941 | ||
942 | printf_filtered ("\t%s", hex_string_custom (p->addr, wid)); | |
943 | printf_filtered (" - %s", hex_string_custom (p->endaddr, wid)); | |
944 | ||
945 | /* FIXME: A format of "08l" is not wide enough for file offsets | |
946 | larger than 4GB. OTOH, making it "016l" isn't desirable either | |
947 | since most output will then be much wider than necessary. It | |
948 | may make sense to test the size of the file and choose the | |
949 | format string accordingly. */ | |
950 | /* FIXME: i18n: Need to rewrite this sentence. */ | |
951 | if (info_verbose) | |
952 | printf_filtered (" @ %s", | |
953 | hex_string_custom (psect->filepos, 8)); | |
954 | printf_filtered (" is %s", bfd_section_name (pbfd, psect)); | |
955 | if (pbfd != abfd) | |
956 | printf_filtered (" in %s", bfd_get_filename (pbfd)); | |
957 | printf_filtered ("\n"); | |
958 | } | |
959 | } | |
960 | ||
961 | void | |
962 | exec_target::files_info () | |
963 | { | |
964 | if (exec_bfd) | |
965 | print_section_info (current_target_sections, exec_bfd); | |
966 | else | |
967 | puts_filtered (_("\t<no file loaded>\n")); | |
968 | } | |
969 | ||
970 | static void | |
971 | set_section_command (const char *args, int from_tty) | |
972 | { | |
973 | struct target_section *p; | |
974 | const char *secname; | |
975 | unsigned seclen; | |
976 | unsigned long secaddr; | |
977 | char secprint[100]; | |
978 | long offset; | |
979 | struct target_section_table *table; | |
980 | ||
981 | if (args == 0) | |
982 | error (_("Must specify section name and its virtual address")); | |
983 | ||
984 | /* Parse out section name. */ | |
985 | for (secname = args; !isspace (*args); args++); | |
986 | seclen = args - secname; | |
987 | ||
988 | /* Parse out new virtual address. */ | |
989 | secaddr = parse_and_eval_address (args); | |
990 | ||
991 | table = current_target_sections; | |
992 | for (p = table->sections; p < table->sections_end; p++) | |
993 | { | |
994 | if (!strncmp (secname, bfd_section_name (p->bfd, | |
995 | p->the_bfd_section), seclen) | |
996 | && bfd_section_name (p->bfd, p->the_bfd_section)[seclen] == '\0') | |
997 | { | |
998 | offset = secaddr - p->addr; | |
999 | p->addr += offset; | |
1000 | p->endaddr += offset; | |
1001 | if (from_tty) | |
1002 | exec_ops.files_info (); | |
1003 | return; | |
1004 | } | |
1005 | } | |
1006 | if (seclen >= sizeof (secprint)) | |
1007 | seclen = sizeof (secprint) - 1; | |
1008 | strncpy (secprint, secname, seclen); | |
1009 | secprint[seclen] = '\0'; | |
1010 | error (_("Section %s not found"), secprint); | |
1011 | } | |
1012 | ||
1013 | /* If we can find a section in FILENAME with BFD index INDEX, adjust | |
1014 | it to ADDRESS. */ | |
1015 | ||
1016 | void | |
1017 | exec_set_section_address (const char *filename, int index, CORE_ADDR address) | |
1018 | { | |
1019 | struct target_section *p; | |
1020 | struct target_section_table *table; | |
1021 | ||
1022 | table = current_target_sections; | |
1023 | for (p = table->sections; p < table->sections_end; p++) | |
1024 | { | |
1025 | if (filename_cmp (filename, p->the_bfd_section->owner->filename) == 0 | |
1026 | && index == p->the_bfd_section->index) | |
1027 | { | |
1028 | p->endaddr += address - p->addr; | |
1029 | p->addr = address; | |
1030 | } | |
1031 | } | |
1032 | } | |
1033 | ||
1034 | int | |
1035 | exec_target::has_memory () | |
1036 | { | |
1037 | /* We can provide memory if we have any file/target sections to read | |
1038 | from. */ | |
1039 | return (current_target_sections->sections | |
1040 | != current_target_sections->sections_end); | |
1041 | } | |
1042 | ||
1043 | char * | |
1044 | exec_target::make_corefile_notes (bfd *obfd, int *note_size) | |
1045 | { | |
1046 | error (_("Can't create a corefile")); | |
1047 | } | |
1048 | ||
1049 | int | |
1050 | exec_target::find_memory_regions (find_memory_region_ftype func, void *data) | |
1051 | { | |
1052 | return objfile_find_memory_regions (this, func, data); | |
1053 | } | |
1054 | ||
1055 | void | |
1056 | _initialize_exec (void) | |
1057 | { | |
1058 | struct cmd_list_element *c; | |
1059 | ||
1060 | if (!dbx_commands) | |
1061 | { | |
1062 | c = add_cmd ("file", class_files, file_command, _("\ | |
1063 | Use FILE as program to be debugged.\n\ | |
1064 | It is read for its symbols, for getting the contents of pure memory,\n\ | |
1065 | and it is the program executed when you use the `run' command.\n\ | |
1066 | If FILE cannot be found as specified, your execution directory path\n\ | |
1067 | ($PATH) is searched for a command of that name.\n\ | |
1068 | No arg means to have no executable file and no symbols."), &cmdlist); | |
1069 | set_cmd_completer (c, filename_completer); | |
1070 | } | |
1071 | ||
1072 | c = add_cmd ("exec-file", class_files, exec_file_command, _("\ | |
1073 | Use FILE as program for getting contents of pure memory.\n\ | |
1074 | If FILE cannot be found as specified, your execution directory path\n\ | |
1075 | is searched for a command of that name.\n\ | |
1076 | No arg means have no executable file."), &cmdlist); | |
1077 | set_cmd_completer (c, filename_completer); | |
1078 | ||
1079 | add_com ("section", class_files, set_section_command, _("\ | |
1080 | Change the base address of section SECTION of the exec file to ADDR.\n\ | |
1081 | This can be used if the exec file does not contain section addresses,\n\ | |
1082 | (such as in the a.out format), or when the addresses specified in the\n\ | |
1083 | file itself are wrong. Each section must be changed separately. The\n\ | |
1084 | ``info files'' command lists all the sections and their addresses.")); | |
1085 | ||
1086 | add_setshow_boolean_cmd ("write", class_support, &write_files, _("\ | |
1087 | Set writing into executable and core files."), _("\ | |
1088 | Show writing into executable and core files."), NULL, | |
1089 | NULL, | |
1090 | show_write_files, | |
1091 | &setlist, &showlist); | |
1092 | ||
1093 | add_target_with_completer (&exec_ops, filename_completer); | |
1094 | } |