1 /* Work with executable files, for GDB.
2
3 Copyright (C) 1988-2013 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
38 #include <fcntl.h>
39 #include "readline/readline.h"
40 #include "gdb_string.h"
41
42 #include "gdbcore.h"
43
44 #include <ctype.h>
45 #include "gdb_stat.h"
46
47 #include "xcoffsolib.h"
48
49 struct vmap *map_vmap (bfd *, bfd *);
50
51 void (*deprecated_file_changed_hook) (char *);
52
53 /* Prototypes for local functions */
54
55 static void file_command (char *, int);
56
57 static void set_section_command (char *, int);
58
59 static void exec_files_info (struct target_ops *);
60
61 static void init_exec_ops (void);
62
63 void _initialize_exec (void);
64
65 /* The target vector for executable files. */
66
67 struct target_ops exec_ops;
68
69 /* True if the exec target is pushed on the stack. */
70 static int using_exec_ops;
71
72 /* Whether to open exec and core files read-only or read-write. */
73
74 int write_files = 0;
75 static void
show_write_files(struct ui_file * file,int from_tty,struct cmd_list_element * c,const char * value)76 show_write_files (struct ui_file *file, int from_tty,
77 struct cmd_list_element *c, const char *value)
78 {
79 fprintf_filtered (file, _("Writing into executable and core files is %s.\n"),
80 value);
81 }
82
83
84 struct vmap *vmap;
85
86 static void
exec_open(char * args,int from_tty)87 exec_open (char *args, int from_tty)
88 {
89 target_preopen (from_tty);
90 exec_file_attach (args, from_tty);
91 }
92
93 /* Close and clear exec_bfd. If we end up with no target sections to
94 read memory from, this unpushes the exec_ops target. */
95
96 void
exec_close(void)97 exec_close (void)
98 {
99 if (exec_bfd)
100 {
101 bfd *abfd = exec_bfd;
102
103 gdb_bfd_unref (abfd);
104
105 /* Removing target sections may close the exec_ops target.
106 Clear exec_bfd before doing so to prevent recursion. */
107 exec_bfd = NULL;
108 exec_bfd_mtime = 0;
109
110 remove_target_sections (&exec_bfd, abfd);
111
112 xfree (exec_filename);
113 exec_filename = NULL;
114 }
115 }
116
117 /* This is the target_close implementation. Clears all target
118 sections and closes all executable bfds from all program spaces. */
119
120 static void
exec_close_1(int quitting)121 exec_close_1 (int quitting)
122 {
123 struct vmap *vp, *nxt;
124
125 using_exec_ops = 0;
126
127 for (nxt = vmap; nxt != NULL;)
128 {
129 vp = nxt;
130 nxt = vp->nxt;
131
132 if (vp->objfile)
133 free_objfile (vp->objfile);
134
135 gdb_bfd_unref (vp->bfd);
136
137 xfree (vp);
138 }
139
140 vmap = NULL;
141
142 {
143 struct program_space *ss;
144 struct cleanup *old_chain;
145
146 old_chain = save_current_program_space ();
147 ALL_PSPACES (ss)
148 {
149 set_current_program_space (ss);
150
151 /* Delete all target sections. */
152 resize_section_table
153 (current_target_sections,
154 -resize_section_table (current_target_sections, 0));
155
156 exec_close ();
157 }
158
159 do_cleanups (old_chain);
160 }
161 }
162
163 void
exec_file_clear(int from_tty)164 exec_file_clear (int from_tty)
165 {
166 /* Remove exec file. */
167 exec_close ();
168
169 if (from_tty)
170 printf_unfiltered (_("No executable file now.\n"));
171 }
172
173 /* Set FILENAME as the new exec file.
174
175 This function is intended to be behave essentially the same
176 as exec_file_command, except that the latter will detect when
177 a target is being debugged, and will ask the user whether it
178 should be shut down first. (If the answer is "no", then the
179 new file is ignored.)
180
181 This file is used by exec_file_command, to do the work of opening
182 and processing the exec file after any prompting has happened.
183
184 And, it is used by child_attach, when the attach command was
185 given a pid but not a exec pathname, and the attach command could
186 figure out the pathname from the pid. (In this case, we shouldn't
187 ask the user whether the current target should be shut down --
188 we're supplying the exec pathname late for good reason.) */
189
190 void
exec_file_attach(char * filename,int from_tty)191 exec_file_attach (char *filename, int from_tty)
192 {
193 /* Remove any previous exec file. */
194 exec_close ();
195
196 /* Now open and digest the file the user requested, if any. */
197
198 if (!filename)
199 {
200 if (from_tty)
201 printf_unfiltered (_("No executable file now.\n"));
202
203 set_gdbarch_from_file (NULL);
204 }
205 else
206 {
207 struct cleanup *cleanups;
208 char *scratch_pathname, *canonical_pathname;
209 int scratch_chan;
210 struct target_section *sections = NULL, *sections_end = NULL;
211 char **matching;
212
213 scratch_chan = openp (getenv ("PATH"),
214 OPF_TRY_CWD_FIRST | OPF_DISABLE_REALPATH, filename,
215 write_files ? O_RDWR | O_BINARY : O_RDONLY | O_BINARY,
216 &scratch_pathname);
217 #if defined(__GO32__) || defined(_WIN32) || defined(__CYGWIN__)
218 if (scratch_chan < 0)
219 {
220 char *exename = alloca (strlen (filename) + 5);
221
222 strcat (strcpy (exename, filename), ".exe");
223 scratch_chan = openp (getenv ("PATH"),
224 OPF_TRY_CWD_FIRST | OPF_DISABLE_REALPATH,
225 exename,
226 write_files ? O_RDWR | O_BINARY : O_RDONLY | O_BINARY,
227 &scratch_pathname);
228 }
229 #endif
230 if (scratch_chan < 0)
231 perror_with_name (filename);
232
233 cleanups = make_cleanup (xfree, scratch_pathname);
234
235 /* gdb_bfd_open (and its variants) prefers canonicalized pathname for
236 better BFD caching. */
237 canonical_pathname = gdb_realpath (scratch_pathname);
238 make_cleanup (xfree, canonical_pathname);
239
240 if (write_files)
241 exec_bfd = gdb_bfd_fopen (canonical_pathname, gnutarget,
242 FOPEN_RUB, scratch_chan);
243 else
244 exec_bfd = gdb_bfd_open (canonical_pathname, gnutarget, scratch_chan);
245
246 if (!exec_bfd)
247 {
248 error (_("\"%s\": could not open as an executable file: %s"),
249 scratch_pathname, bfd_errmsg (bfd_get_error ()));
250 }
251
252 gdb_assert (exec_filename == NULL);
253 exec_filename = xstrdup (scratch_pathname);
254
255 if (!bfd_check_format_matches (exec_bfd, bfd_object, &matching))
256 {
257 /* Make sure to close exec_bfd, or else "run" might try to use
258 it. */
259 exec_close ();
260 error (_("\"%s\": not in executable format: %s"),
261 scratch_pathname,
262 gdb_bfd_errmsg (bfd_get_error (), matching));
263 }
264
265 /* FIXME - This should only be run for RS6000, but the ifdef is a poor
266 way to accomplish. */
267 #ifdef DEPRECATED_IBM6000_TARGET
268 /* Setup initial vmap. */
269
270 map_vmap (exec_bfd, 0);
271 if (vmap == NULL)
272 {
273 /* Make sure to close exec_bfd, or else "run" might try to use
274 it. */
275 exec_close ();
276 error (_("\"%s\": can't find the file sections: %s"),
277 scratch_pathname, bfd_errmsg (bfd_get_error ()));
278 }
279 #endif /* DEPRECATED_IBM6000_TARGET */
280
281 if (build_section_table (exec_bfd, §ions, §ions_end))
282 {
283 /* Make sure to close exec_bfd, or else "run" might try to use
284 it. */
285 exec_close ();
286 error (_("\"%s\": can't find the file sections: %s"),
287 scratch_pathname, bfd_errmsg (bfd_get_error ()));
288 }
289
290 exec_bfd_mtime = bfd_get_mtime (exec_bfd);
291
292 validate_files ();
293
294 set_gdbarch_from_file (exec_bfd);
295
296 /* Add the executable's sections to the current address spaces'
297 list of sections. This possibly pushes the exec_ops
298 target. */
299 add_target_sections (&exec_bfd, sections, sections_end);
300 xfree (sections);
301
302 /* Tell display code (if any) about the changed file name. */
303 if (deprecated_exec_file_display_hook)
304 (*deprecated_exec_file_display_hook) (filename);
305
306 do_cleanups (cleanups);
307 }
308 bfd_cache_close_all ();
309 observer_notify_executable_changed ();
310 }
311
312 /* Process the first arg in ARGS as the new exec file.
313
314 Note that we have to explicitly ignore additional args, since we can
315 be called from file_command(), which also calls symbol_file_command()
316 which can take multiple args.
317
318 If ARGS is NULL, we just want to close the exec file. */
319
320 static void
exec_file_command(char * args,int from_tty)321 exec_file_command (char *args, int from_tty)
322 {
323 char **argv;
324 char *filename;
325
326 if (from_tty && target_has_execution
327 && !query (_("A program is being debugged already.\n"
328 "Are you sure you want to change the file? ")))
329 error (_("File not changed."));
330
331 if (args)
332 {
333 struct cleanup *cleanups;
334
335 /* Scan through the args and pick up the first non option arg
336 as the filename. */
337
338 argv = gdb_buildargv (args);
339 cleanups = make_cleanup_freeargv (argv);
340
341 for (; (*argv != NULL) && (**argv == '-'); argv++)
342 {;
343 }
344 if (*argv == NULL)
345 error (_("No executable file name was specified"));
346
347 filename = tilde_expand (*argv);
348 make_cleanup (xfree, filename);
349 exec_file_attach (filename, from_tty);
350
351 do_cleanups (cleanups);
352 }
353 else
354 exec_file_attach (NULL, from_tty);
355 }
356
357 /* Set both the exec file and the symbol file, in one command.
358 What a novelty. Why did GDB go through four major releases before this
359 command was added? */
360
361 static void
file_command(char * arg,int from_tty)362 file_command (char *arg, int from_tty)
363 {
364 /* FIXME, if we lose on reading the symbol file, we should revert
365 the exec file, but that's rough. */
366 exec_file_command (arg, from_tty);
367 symbol_file_command (arg, from_tty);
368 if (deprecated_file_changed_hook)
369 deprecated_file_changed_hook (arg);
370 }
371
372
373 /* Locate all mappable sections of a BFD file.
374 table_pp_char is a char * to get it through bfd_map_over_sections;
375 we cast it back to its proper type. */
376
377 static void
add_to_section_table(bfd * abfd,struct bfd_section * asect,void * table_pp_char)378 add_to_section_table (bfd *abfd, struct bfd_section *asect,
379 void *table_pp_char)
380 {
381 struct target_section **table_pp = (struct target_section **) table_pp_char;
382 flagword aflag;
383
384 /* Check the section flags, but do not discard zero-length sections, since
385 some symbols may still be attached to this section. For instance, we
386 encountered on sparc-solaris 2.10 a shared library with an empty .bss
387 section to which a symbol named "_end" was attached. The address
388 of this symbol still needs to be relocated. */
389 aflag = bfd_get_section_flags (abfd, asect);
390 if (!(aflag & SEC_ALLOC))
391 return;
392
393 (*table_pp)->key = NULL;
394 (*table_pp)->bfd = abfd;
395 (*table_pp)->the_bfd_section = asect;
396 (*table_pp)->addr = bfd_section_vma (abfd, asect);
397 (*table_pp)->endaddr = (*table_pp)->addr + bfd_section_size (abfd, asect);
398 (*table_pp)++;
399 }
400
401 int
resize_section_table(struct target_section_table * table,int num_added)402 resize_section_table (struct target_section_table *table, int num_added)
403 {
404 int old_count;
405 int new_count;
406
407 old_count = table->sections_end - table->sections;
408
409 if (!num_added)
410 return old_count;
411
412 new_count = num_added + old_count;
413
414 if (new_count)
415 {
416 table->sections = xrealloc (table->sections,
417 sizeof (struct target_section) * new_count);
418 table->sections_end = table->sections + new_count;
419 }
420 else
421 {
422 xfree (table->sections);
423 table->sections = table->sections_end = NULL;
424 }
425
426 return old_count;
427 }
428
429 /* Builds a section table, given args BFD, SECTABLE_PTR, SECEND_PTR.
430 Returns 0 if OK, 1 on error. */
431
432 int
build_section_table(struct bfd * some_bfd,struct target_section ** start,struct target_section ** end)433 build_section_table (struct bfd *some_bfd, struct target_section **start,
434 struct target_section **end)
435 {
436 unsigned count;
437
438 count = bfd_count_sections (some_bfd);
439 if (*start)
440 xfree (* start);
441 *start = (struct target_section *) xmalloc (count * sizeof (**start));
442 *end = *start;
443 bfd_map_over_sections (some_bfd, add_to_section_table, (char *) end);
444 if (*end > *start + count)
445 internal_error (__FILE__, __LINE__,
446 _("failed internal consistency check"));
447 /* We could realloc the table, but it probably loses for most files. */
448 return 0;
449 }
450
451 /* Add the sections array defined by [SECTIONS..SECTIONS_END[ to the
452 current set of target sections. */
453
454 void
add_target_sections(void * key,struct target_section * sections,struct target_section * sections_end)455 add_target_sections (void *key,
456 struct target_section *sections,
457 struct target_section *sections_end)
458 {
459 int count;
460 struct target_section_table *table = current_target_sections;
461
462 count = sections_end - sections;
463
464 if (count > 0)
465 {
466 int space = resize_section_table (table, count);
467 int i;
468
469 for (i = 0; i < count; ++i)
470 {
471 table->sections[space + i] = sections[i];
472 table->sections[space + i].key = key;
473 }
474
475 /* If these are the first file sections we can provide memory
476 from, push the file_stratum target. */
477 if (!using_exec_ops)
478 {
479 using_exec_ops = 1;
480 push_target (&exec_ops);
481 }
482 }
483 }
484
485 /* Remove all target sections taken from ABFD. */
486
487 void
remove_target_sections(void * key,bfd * abfd)488 remove_target_sections (void *key, bfd *abfd)
489 {
490 struct target_section *src, *dest;
491 struct target_section_table *table = current_target_sections;
492
493 dest = table->sections;
494 for (src = table->sections; src < table->sections_end; src++)
495 if (src->key != key || src->bfd != abfd)
496 {
497 /* Keep this section. */
498 if (dest < src)
499 *dest = *src;
500 dest++;
501 }
502
503 /* If we've dropped any sections, resize the section table. */
504 if (dest < src)
505 {
506 int old_count;
507
508 old_count = resize_section_table (table, dest - src);
509
510 /* If we don't have any more sections to read memory from,
511 remove the file_stratum target from the stack. */
512 if (old_count + (dest - src) == 0)
513 {
514 struct program_space *pspace;
515
516 ALL_PSPACES (pspace)
517 if (pspace->target_sections.sections
518 != pspace->target_sections.sections_end)
519 return;
520
521 unpush_target (&exec_ops);
522 }
523 }
524 }
525
526
527 static void
bfdsec_to_vmap(struct bfd * abfd,struct bfd_section * sect,void * arg3)528 bfdsec_to_vmap (struct bfd *abfd, struct bfd_section *sect, void *arg3)
529 {
530 struct vmap_and_bfd *vmap_bfd = (struct vmap_and_bfd *) arg3;
531 struct vmap *vp;
532
533 vp = vmap_bfd->pvmap;
534
535 if ((bfd_get_section_flags (abfd, sect) & SEC_LOAD) == 0)
536 return;
537
538 if (strcmp (bfd_section_name (abfd, sect), ".text") == 0)
539 {
540 vp->tstart = bfd_section_vma (abfd, sect);
541 vp->tend = vp->tstart + bfd_section_size (abfd, sect);
542 vp->tvma = bfd_section_vma (abfd, sect);
543 vp->toffs = sect->filepos;
544 }
545 else if (strcmp (bfd_section_name (abfd, sect), ".data") == 0)
546 {
547 vp->dstart = bfd_section_vma (abfd, sect);
548 vp->dend = vp->dstart + bfd_section_size (abfd, sect);
549 vp->dvma = bfd_section_vma (abfd, sect);
550 }
551 /* Silently ignore other types of sections. (FIXME?) */
552 }
553
554 /* Make a vmap for ABFD which might be a member of the archive ARCH.
555 Return the new vmap. */
556
557 struct vmap *
map_vmap(bfd * abfd,bfd * arch)558 map_vmap (bfd *abfd, bfd *arch)
559 {
560 struct vmap_and_bfd vmap_bfd;
561 struct vmap *vp, **vpp;
562
563 vp = (struct vmap *) xmalloc (sizeof (*vp));
564 memset ((char *) vp, '\0', sizeof (*vp));
565 vp->nxt = 0;
566 vp->bfd = abfd;
567 gdb_bfd_ref (abfd);
568 vp->name = bfd_get_filename (arch ? arch : abfd);
569 vp->member = arch ? bfd_get_filename (abfd) : "";
570
571 vmap_bfd.pbfd = arch;
572 vmap_bfd.pvmap = vp;
573 bfd_map_over_sections (abfd, bfdsec_to_vmap, &vmap_bfd);
574
575 /* Find the end of the list and append. */
576 for (vpp = &vmap; *vpp; vpp = &(*vpp)->nxt)
577 ;
578 *vpp = vp;
579
580 return vp;
581 }
582
583
VEC(mem_range_s)584 VEC(mem_range_s) *
585 section_table_available_memory (VEC(mem_range_s) *memory,
586 CORE_ADDR memaddr, ULONGEST len,
587 struct target_section *sections,
588 struct target_section *sections_end)
589 {
590 struct target_section *p;
591
592 for (p = sections; p < sections_end; p++)
593 {
594 if ((bfd_get_section_flags (p->bfd, p->the_bfd_section)
595 & SEC_READONLY) == 0)
596 continue;
597
598 /* Copy the meta-data, adjusted. */
599 if (mem_ranges_overlap (p->addr, p->endaddr - p->addr, memaddr, len))
600 {
601 ULONGEST lo1, hi1, lo2, hi2;
602 struct mem_range *r;
603
604 lo1 = memaddr;
605 hi1 = memaddr + len;
606
607 lo2 = p->addr;
608 hi2 = p->endaddr;
609
610 r = VEC_safe_push (mem_range_s, memory, NULL);
611
612 r->start = max (lo1, lo2);
613 r->length = min (hi1, hi2) - r->start;
614 }
615 }
616
617 return memory;
618 }
619
620 int
section_table_xfer_memory_partial(gdb_byte * readbuf,const gdb_byte * writebuf,ULONGEST offset,LONGEST len,struct target_section * sections,struct target_section * sections_end,const char * section_name)621 section_table_xfer_memory_partial (gdb_byte *readbuf, const gdb_byte *writebuf,
622 ULONGEST offset, LONGEST len,
623 struct target_section *sections,
624 struct target_section *sections_end,
625 const char *section_name)
626 {
627 int res;
628 struct target_section *p;
629 ULONGEST memaddr = offset;
630 ULONGEST memend = memaddr + len;
631
632 if (len <= 0)
633 internal_error (__FILE__, __LINE__,
634 _("failed internal consistency check"));
635
636 for (p = sections; p < sections_end; p++)
637 {
638 if (section_name && strcmp (section_name, p->the_bfd_section->name) != 0)
639 continue; /* not the section we need. */
640 if (memaddr >= p->addr)
641 {
642 if (memend <= p->endaddr)
643 {
644 /* Entire transfer is within this section. */
645 if (writebuf)
646 res = bfd_set_section_contents (p->bfd, p->the_bfd_section,
647 writebuf, memaddr - p->addr,
648 len);
649 else
650 res = bfd_get_section_contents (p->bfd, p->the_bfd_section,
651 readbuf, memaddr - p->addr,
652 len);
653 return (res != 0) ? len : 0;
654 }
655 else if (memaddr >= p->endaddr)
656 {
657 /* This section ends before the transfer starts. */
658 continue;
659 }
660 else
661 {
662 /* This section overlaps the transfer. Just do half. */
663 len = p->endaddr - memaddr;
664 if (writebuf)
665 res = bfd_set_section_contents (p->bfd, p->the_bfd_section,
666 writebuf, memaddr - p->addr,
667 len);
668 else
669 res = bfd_get_section_contents (p->bfd, p->the_bfd_section,
670 readbuf, memaddr - p->addr,
671 len);
672 return (res != 0) ? len : 0;
673 }
674 }
675 }
676
677 return 0; /* We can't help. */
678 }
679
680 static struct target_section_table *
exec_get_section_table(struct target_ops * ops)681 exec_get_section_table (struct target_ops *ops)
682 {
683 return current_target_sections;
684 }
685
686 static LONGEST
exec_xfer_partial(struct target_ops * ops,enum target_object object,const char * annex,gdb_byte * readbuf,const gdb_byte * writebuf,ULONGEST offset,LONGEST len)687 exec_xfer_partial (struct target_ops *ops, enum target_object object,
688 const char *annex, gdb_byte *readbuf,
689 const gdb_byte *writebuf,
690 ULONGEST offset, LONGEST len)
691 {
692 struct target_section_table *table = target_get_section_table (ops);
693
694 if (object == TARGET_OBJECT_MEMORY)
695 return section_table_xfer_memory_partial (readbuf, writebuf,
696 offset, len,
697 table->sections,
698 table->sections_end,
699 NULL);
700 else
701 return -1;
702 }
703
704
705 void
print_section_info(struct target_section_table * t,bfd * abfd)706 print_section_info (struct target_section_table *t, bfd *abfd)
707 {
708 struct gdbarch *gdbarch = gdbarch_from_bfd (abfd);
709 struct target_section *p;
710 /* FIXME: 16 is not wide enough when gdbarch_addr_bit > 64. */
711 int wid = gdbarch_addr_bit (gdbarch) <= 32 ? 8 : 16;
712
713 printf_filtered ("\t`%s', ", bfd_get_filename (abfd));
714 wrap_here (" ");
715 printf_filtered (_("file type %s.\n"), bfd_get_target (abfd));
716 if (abfd == exec_bfd)
717 {
718 /* gcc-3.4 does not like the initialization in
719 <p == t->sections_end>. */
720 bfd_vma displacement = 0;
721 bfd_vma entry_point;
722
723 for (p = t->sections; p < t->sections_end; p++)
724 {
725 asection *asect = p->the_bfd_section;
726
727 if ((bfd_get_section_flags (abfd, asect) & (SEC_ALLOC | SEC_LOAD))
728 != (SEC_ALLOC | SEC_LOAD))
729 continue;
730
731 if (bfd_get_section_vma (abfd, asect) <= abfd->start_address
732 && abfd->start_address < (bfd_get_section_vma (abfd, asect)
733 + bfd_get_section_size (asect)))
734 {
735 displacement = p->addr - bfd_get_section_vma (abfd, asect);
736 break;
737 }
738 }
739 if (p == t->sections_end)
740 warning (_("Cannot find section for the entry point of %s."),
741 bfd_get_filename (abfd));
742
743 entry_point = gdbarch_addr_bits_remove (gdbarch,
744 bfd_get_start_address (abfd)
745 + displacement);
746 printf_filtered (_("\tEntry point: %s\n"),
747 paddress (gdbarch, entry_point));
748 }
749 for (p = t->sections; p < t->sections_end; p++)
750 {
751 printf_filtered ("\t%s", hex_string_custom (p->addr, wid));
752 printf_filtered (" - %s", hex_string_custom (p->endaddr, wid));
753
754 /* FIXME: A format of "08l" is not wide enough for file offsets
755 larger than 4GB. OTOH, making it "016l" isn't desirable either
756 since most output will then be much wider than necessary. It
757 may make sense to test the size of the file and choose the
758 format string accordingly. */
759 /* FIXME: i18n: Need to rewrite this sentence. */
760 if (info_verbose)
761 printf_filtered (" @ %s",
762 hex_string_custom (p->the_bfd_section->filepos, 8));
763 printf_filtered (" is %s", bfd_section_name (p->bfd,
764 p->the_bfd_section));
765 if (p->bfd != abfd)
766 printf_filtered (" in %s", bfd_get_filename (p->bfd));
767 printf_filtered ("\n");
768 }
769 }
770
771 static void
exec_files_info(struct target_ops * t)772 exec_files_info (struct target_ops *t)
773 {
774 if (exec_bfd)
775 print_section_info (current_target_sections, exec_bfd);
776 else
777 puts_filtered (_("\t<no file loaded>\n"));
778
779 if (vmap)
780 {
781 int addr_size = gdbarch_addr_bit (target_gdbarch ()) / 8;
782 struct vmap *vp;
783
784 printf_unfiltered (_("\tMapping info for file `%s'.\n"), vmap->name);
785 printf_unfiltered ("\t %*s %*s %*s %*s %8.8s %s\n",
786 addr_size * 2, "tstart",
787 addr_size * 2, "tend",
788 addr_size * 2, "dstart",
789 addr_size * 2, "dend",
790 "section",
791 "file(member)");
792
793 for (vp = vmap; vp; vp = vp->nxt)
794 printf_unfiltered ("\t0x%s 0x%s 0x%s 0x%s %s%s%s%s\n",
795 phex (vp->tstart, addr_size),
796 phex (vp->tend, addr_size),
797 phex (vp->dstart, addr_size),
798 phex (vp->dend, addr_size),
799 vp->name,
800 *vp->member ? "(" : "", vp->member,
801 *vp->member ? ")" : "");
802 }
803 }
804
805 static void
set_section_command(char * args,int from_tty)806 set_section_command (char *args, int from_tty)
807 {
808 struct target_section *p;
809 char *secname;
810 unsigned seclen;
811 unsigned long secaddr;
812 char secprint[100];
813 long offset;
814 struct target_section_table *table;
815
816 if (args == 0)
817 error (_("Must specify section name and its virtual address"));
818
819 /* Parse out section name. */
820 for (secname = args; !isspace (*args); args++);
821 seclen = args - secname;
822
823 /* Parse out new virtual address. */
824 secaddr = parse_and_eval_address (args);
825
826 table = current_target_sections;
827 for (p = table->sections; p < table->sections_end; p++)
828 {
829 if (!strncmp (secname, bfd_section_name (p->bfd,
830 p->the_bfd_section), seclen)
831 && bfd_section_name (p->bfd, p->the_bfd_section)[seclen] == '\0')
832 {
833 offset = secaddr - p->addr;
834 p->addr += offset;
835 p->endaddr += offset;
836 if (from_tty)
837 exec_files_info (&exec_ops);
838 return;
839 }
840 }
841 if (seclen >= sizeof (secprint))
842 seclen = sizeof (secprint) - 1;
843 strncpy (secprint, secname, seclen);
844 secprint[seclen] = '\0';
845 error (_("Section %s not found"), secprint);
846 }
847
848 /* If we can find a section in FILENAME with BFD index INDEX, adjust
849 it to ADDRESS. */
850
851 void
exec_set_section_address(const char * filename,int index,CORE_ADDR address)852 exec_set_section_address (const char *filename, int index, CORE_ADDR address)
853 {
854 struct target_section *p;
855 struct target_section_table *table;
856
857 table = current_target_sections;
858 for (p = table->sections; p < table->sections_end; p++)
859 {
860 if (filename_cmp (filename, p->bfd->filename) == 0
861 && index == p->the_bfd_section->index)
862 {
863 p->endaddr += address - p->addr;
864 p->addr = address;
865 }
866 }
867 }
868
869 /* If mourn is being called in all the right places, this could be say
870 `gdb internal error' (since generic_mourn calls
871 breakpoint_init_inferior). */
872
873 static int
ignore(struct gdbarch * gdbarch,struct bp_target_info * bp_tgt)874 ignore (struct gdbarch *gdbarch, struct bp_target_info *bp_tgt)
875 {
876 return 0;
877 }
878
879 static int
exec_has_memory(struct target_ops * ops)880 exec_has_memory (struct target_ops *ops)
881 {
882 /* We can provide memory if we have any file/target sections to read
883 from. */
884 return (current_target_sections->sections
885 != current_target_sections->sections_end);
886 }
887
888 /* Find mapped memory. */
889
890 extern void
exec_set_find_memory_regions(int (* func)(find_memory_region_ftype,void *))891 exec_set_find_memory_regions (int (*func) (find_memory_region_ftype, void *))
892 {
893 exec_ops.to_find_memory_regions = func;
894 }
895
896 static char *exec_make_note_section (bfd *, int *);
897
898 /* Fill in the exec file target vector. Very few entries need to be
899 defined. */
900
901 static void
init_exec_ops(void)902 init_exec_ops (void)
903 {
904 exec_ops.to_shortname = "exec";
905 exec_ops.to_longname = "Local exec file";
906 exec_ops.to_doc = "Use an executable file as a target.\n\
907 Specify the filename of the executable file.";
908 exec_ops.to_open = exec_open;
909 exec_ops.to_close = exec_close_1;
910 exec_ops.to_attach = find_default_attach;
911 exec_ops.to_xfer_partial = exec_xfer_partial;
912 exec_ops.to_get_section_table = exec_get_section_table;
913 exec_ops.to_files_info = exec_files_info;
914 exec_ops.to_insert_breakpoint = ignore;
915 exec_ops.to_remove_breakpoint = ignore;
916 exec_ops.to_create_inferior = find_default_create_inferior;
917 exec_ops.to_stratum = file_stratum;
918 exec_ops.to_has_memory = exec_has_memory;
919 exec_ops.to_make_corefile_notes = exec_make_note_section;
920 exec_ops.to_magic = OPS_MAGIC;
921 }
922
923 void
_initialize_exec(void)924 _initialize_exec (void)
925 {
926 struct cmd_list_element *c;
927
928 init_exec_ops ();
929
930 if (!dbx_commands)
931 {
932 c = add_cmd ("file", class_files, file_command, _("\
933 Use FILE as program to be debugged.\n\
934 It is read for its symbols, for getting the contents of pure memory,\n\
935 and it is the program executed when you use the `run' command.\n\
936 If FILE cannot be found as specified, your execution directory path\n\
937 ($PATH) is searched for a command of that name.\n\
938 No arg means to have no executable file and no symbols."), &cmdlist);
939 set_cmd_completer (c, filename_completer);
940 }
941
942 c = add_cmd ("exec-file", class_files, exec_file_command, _("\
943 Use FILE as program for getting contents of pure memory.\n\
944 If FILE cannot be found as specified, your execution directory path\n\
945 is searched for a command of that name.\n\
946 No arg means have no executable file."), &cmdlist);
947 set_cmd_completer (c, filename_completer);
948
949 add_com ("section", class_files, set_section_command, _("\
950 Change the base address of section SECTION of the exec file to ADDR.\n\
951 This can be used if the exec file does not contain section addresses,\n\
952 (such as in the a.out format), or when the addresses specified in the\n\
953 file itself are wrong. Each section must be changed separately. The\n\
954 ``info files'' command lists all the sections and their addresses."));
955
956 add_setshow_boolean_cmd ("write", class_support, &write_files, _("\
957 Set writing into executable and core files."), _("\
958 Show writing into executable and core files."), NULL,
959 NULL,
960 show_write_files,
961 &setlist, &showlist);
962
963 add_target (&exec_ops);
964 }
965
966 static char *
exec_make_note_section(bfd * obfd,int * note_size)967 exec_make_note_section (bfd *obfd, int *note_size)
968 {
969 error (_("Can't create a corefile"));
970 }
971