1 /* Work with executable files, for GDB.
2
3 Copyright 1988, 1989, 1990, 1991, 1992, 1993, 1994, 1995, 1996,
4 1997, 1998, 1999, 2000, 2001, 2002, 2003 Free Software Foundation,
5 Inc.
6
7 This file is part of GDB.
8
9 This program is free software; you can redistribute it and/or modify
10 it under the terms of the GNU General Public License as published by
11 the Free Software Foundation; either version 2 of the License, or
12 (at your option) any later version.
13
14 This program is distributed in the hope that it will be useful,
15 but WITHOUT ANY WARRANTY; without even the implied warranty of
16 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
17 GNU General Public License for more details.
18
19 You should have received a copy of the GNU General Public License
20 along with this program; if not, write to the Free Software
21 Foundation, Inc., 59 Temple Place - Suite 330,
22 Boston, MA 02111-1307, USA. */
23
24 #include "defs.h"
25 #include "frame.h"
26 #include "inferior.h"
27 #include "target.h"
28 #include "gdbcmd.h"
29 #include "language.h"
30 #include "symfile.h"
31 #include "objfiles.h"
32 #include "completer.h"
33 #include "value.h"
34 #include "exec.h"
35
36 #ifdef USG
37 #include <sys/types.h>
38 #endif
39
40 #include <fcntl.h>
41 #include "readline/readline.h"
42 #include "gdb_string.h"
43
44 #include "gdbcore.h"
45
46 #include <ctype.h>
47 #include "gdb_stat.h"
48 #ifndef O_BINARY
49 #define O_BINARY 0
50 #endif
51
52 #include "xcoffsolib.h"
53
54 struct vmap *map_vmap (bfd *, bfd *);
55
56 void (*file_changed_hook) (char *);
57
58 /* Prototypes for local functions */
59
60 static void exec_close (int);
61
62 static void file_command (char *, int);
63
64 static void set_section_command (char *, int);
65
66 static void exec_files_info (struct target_ops *);
67
68 static int ignore (CORE_ADDR, char *);
69
70 static void init_exec_ops (void);
71
72 void _initialize_exec (void);
73
74 /* The target vector for executable files. */
75
76 struct target_ops exec_ops;
77
78 /* The Binary File Descriptor handle for the executable file. */
79
80 bfd *exec_bfd = NULL;
81
82 /* Whether to open exec and core files read-only or read-write. */
83
84 int write_files = 0;
85
86 struct vmap *vmap;
87
88 void
exec_open(char * args,int from_tty)89 exec_open (char *args, int from_tty)
90 {
91 target_preopen (from_tty);
92 exec_file_attach (args, from_tty);
93 }
94
95 static void
exec_close(int quitting)96 exec_close (int quitting)
97 {
98 int need_symtab_cleanup = 0;
99 struct vmap *vp, *nxt;
100
101 for (nxt = vmap; nxt != NULL;)
102 {
103 vp = nxt;
104 nxt = vp->nxt;
105
106 /* if there is an objfile associated with this bfd,
107 free_objfile() will do proper cleanup of objfile *and* bfd. */
108
109 if (vp->objfile)
110 {
111 free_objfile (vp->objfile);
112 need_symtab_cleanup = 1;
113 }
114 else if (vp->bfd != exec_bfd)
115 /* FIXME-leak: We should be freeing vp->name too, I think. */
116 if (!bfd_close (vp->bfd))
117 warning ("cannot close \"%s\": %s",
118 vp->name, bfd_errmsg (bfd_get_error ()));
119
120 /* FIXME: This routine is #if 0'd in symfile.c. What should we
121 be doing here? Should we just free everything in
122 vp->objfile->symtabs? Should free_objfile do that?
123 FIXME-as-well: free_objfile already free'd vp->name, so it isn't
124 valid here. */
125 free_named_symtabs (vp->name);
126 xfree (vp);
127 }
128
129 vmap = NULL;
130
131 if (exec_bfd)
132 {
133 char *name = bfd_get_filename (exec_bfd);
134
135 if (!bfd_close (exec_bfd))
136 warning ("cannot close \"%s\": %s",
137 name, bfd_errmsg (bfd_get_error ()));
138 xfree (name);
139 exec_bfd = NULL;
140 }
141
142 if (exec_ops.to_sections)
143 {
144 xfree (exec_ops.to_sections);
145 exec_ops.to_sections = NULL;
146 exec_ops.to_sections_end = NULL;
147 }
148 }
149
150 void
exec_file_clear(int from_tty)151 exec_file_clear (int from_tty)
152 {
153 /* Remove exec file. */
154 unpush_target (&exec_ops);
155
156 if (from_tty)
157 printf_unfiltered ("No executable file now.\n");
158 }
159
160 /* Process the first arg in ARGS as the new exec file.
161
162 This function is intended to be behave essentially the same
163 as exec_file_command, except that the latter will detect when
164 a target is being debugged, and will ask the user whether it
165 should be shut down first. (If the answer is "no", then the
166 new file is ignored.)
167
168 This file is used by exec_file_command, to do the work of opening
169 and processing the exec file after any prompting has happened.
170
171 And, it is used by child_attach, when the attach command was
172 given a pid but not a exec pathname, and the attach command could
173 figure out the pathname from the pid. (In this case, we shouldn't
174 ask the user whether the current target should be shut down --
175 we're supplying the exec pathname late for good reason.)
176
177 ARGS is assumed to be the filename. */
178
179 void
exec_file_attach(char * filename,int from_tty)180 exec_file_attach (char *filename, int from_tty)
181 {
182 /* Remove any previous exec file. */
183 unpush_target (&exec_ops);
184
185 /* Now open and digest the file the user requested, if any. */
186
187 if (!filename)
188 {
189 if (from_tty)
190 printf_unfiltered ("No executable file now.\n");
191 }
192 else
193 {
194 char *scratch_pathname;
195 int scratch_chan;
196
197 scratch_chan = openp (getenv ("PATH"), 1, filename,
198 write_files ? O_RDWR | O_BINARY : O_RDONLY | O_BINARY, 0,
199 &scratch_pathname);
200 #if defined(__GO32__) || defined(_WIN32) || defined(__CYGWIN__)
201 if (scratch_chan < 0)
202 {
203 char *exename = alloca (strlen (filename) + 5);
204 strcat (strcpy (exename, filename), ".exe");
205 scratch_chan = openp (getenv ("PATH"), 1, exename, write_files ?
206 O_RDWR | O_BINARY : O_RDONLY | O_BINARY, 0, &scratch_pathname);
207 }
208 #endif
209 if (scratch_chan < 0)
210 perror_with_name (filename);
211 exec_bfd = bfd_fdopenr (scratch_pathname, gnutarget, scratch_chan);
212
213 if (!exec_bfd)
214 error ("\"%s\": could not open as an executable file: %s",
215 scratch_pathname, bfd_errmsg (bfd_get_error ()));
216
217 /* At this point, scratch_pathname and exec_bfd->name both point to the
218 same malloc'd string. However exec_close() will attempt to free it
219 via the exec_bfd->name pointer, so we need to make another copy and
220 leave exec_bfd as the new owner of the original copy. */
221 scratch_pathname = xstrdup (scratch_pathname);
222 make_cleanup (xfree, scratch_pathname);
223
224 if (!bfd_check_format (exec_bfd, bfd_object))
225 {
226 /* Make sure to close exec_bfd, or else "run" might try to use
227 it. */
228 exec_close (0);
229 error ("\"%s\": not in executable format: %s",
230 scratch_pathname, bfd_errmsg (bfd_get_error ()));
231 }
232
233 /* FIXME - This should only be run for RS6000, but the ifdef is a poor
234 way to accomplish. */
235 #ifdef DEPRECATED_IBM6000_TARGET
236 /* Setup initial vmap. */
237
238 map_vmap (exec_bfd, 0);
239 if (vmap == NULL)
240 {
241 /* Make sure to close exec_bfd, or else "run" might try to use
242 it. */
243 exec_close (0);
244 error ("\"%s\": can't find the file sections: %s",
245 scratch_pathname, bfd_errmsg (bfd_get_error ()));
246 }
247 #endif /* DEPRECATED_IBM6000_TARGET */
248
249 if (build_section_table (exec_bfd, &exec_ops.to_sections,
250 &exec_ops.to_sections_end))
251 {
252 /* Make sure to close exec_bfd, or else "run" might try to use
253 it. */
254 exec_close (0);
255 error ("\"%s\": can't find the file sections: %s",
256 scratch_pathname, bfd_errmsg (bfd_get_error ()));
257 }
258
259 #ifdef DEPRECATED_HPUX_TEXT_END
260 DEPRECATED_HPUX_TEXT_END (&exec_ops);
261 #endif
262
263 validate_files ();
264
265 set_gdbarch_from_file (exec_bfd);
266
267 push_target (&exec_ops);
268
269 /* Tell display code (if any) about the changed file name. */
270 if (exec_file_display_hook)
271 (*exec_file_display_hook) (filename);
272 }
273 }
274
275 /* Process the first arg in ARGS as the new exec file.
276
277 Note that we have to explicitly ignore additional args, since we can
278 be called from file_command(), which also calls symbol_file_command()
279 which can take multiple args.
280
281 If ARGS is NULL, we just want to close the exec file. */
282
283 static void
exec_file_command(char * args,int from_tty)284 exec_file_command (char *args, int from_tty)
285 {
286 char **argv;
287 char *filename;
288
289 target_preopen (from_tty);
290
291 if (args)
292 {
293 /* Scan through the args and pick up the first non option arg
294 as the filename. */
295
296 argv = buildargv (args);
297 if (argv == NULL)
298 nomem (0);
299
300 make_cleanup_freeargv (argv);
301
302 for (; (*argv != NULL) && (**argv == '-'); argv++)
303 {;
304 }
305 if (*argv == NULL)
306 error ("No executable file name was specified");
307
308 filename = tilde_expand (*argv);
309 make_cleanup (xfree, filename);
310 exec_file_attach (filename, from_tty);
311 }
312 else
313 exec_file_attach (NULL, from_tty);
314 }
315
316 /* Set both the exec file and the symbol file, in one command.
317 What a novelty. Why did GDB go through four major releases before this
318 command was added? */
319
320 static void
file_command(char * arg,int from_tty)321 file_command (char *arg, int from_tty)
322 {
323 /* FIXME, if we lose on reading the symbol file, we should revert
324 the exec file, but that's rough. */
325 exec_file_command (arg, from_tty);
326 symbol_file_command (arg, from_tty);
327 if (file_changed_hook)
328 file_changed_hook (arg);
329 }
330
331
332 /* Locate all mappable sections of a BFD file.
333 table_pp_char is a char * to get it through bfd_map_over_sections;
334 we cast it back to its proper type. */
335
336 static void
add_to_section_table(bfd * abfd,struct bfd_section * asect,void * table_pp_char)337 add_to_section_table (bfd *abfd, struct bfd_section *asect,
338 void *table_pp_char)
339 {
340 struct section_table **table_pp = (struct section_table **) table_pp_char;
341 flagword aflag;
342
343 aflag = bfd_get_section_flags (abfd, asect);
344 if (!(aflag & SEC_ALLOC))
345 return;
346 if (0 == bfd_section_size (abfd, asect))
347 return;
348 (*table_pp)->bfd = abfd;
349 (*table_pp)->the_bfd_section = asect;
350 (*table_pp)->addr = bfd_section_vma (abfd, asect);
351 (*table_pp)->endaddr = (*table_pp)->addr + bfd_section_size (abfd, asect);
352 (*table_pp)++;
353 }
354
355 /* Builds a section table, given args BFD, SECTABLE_PTR, SECEND_PTR.
356 Returns 0 if OK, 1 on error. */
357
358 int
build_section_table(struct bfd * some_bfd,struct section_table ** start,struct section_table ** end)359 build_section_table (struct bfd *some_bfd, struct section_table **start,
360 struct section_table **end)
361 {
362 unsigned count;
363
364 count = bfd_count_sections (some_bfd);
365 if (*start)
366 xfree (* start);
367 *start = (struct section_table *) xmalloc (count * sizeof (**start));
368 *end = *start;
369 bfd_map_over_sections (some_bfd, add_to_section_table, (char *) end);
370 if (*end > *start + count)
371 internal_error (__FILE__, __LINE__, "failed internal consistency check");
372 /* We could realloc the table, but it probably loses for most files. */
373 return 0;
374 }
375
376 static void
bfdsec_to_vmap(struct bfd * abfd,struct bfd_section * sect,void * arg3)377 bfdsec_to_vmap (struct bfd *abfd, struct bfd_section *sect, void *arg3)
378 {
379 struct vmap_and_bfd *vmap_bfd = (struct vmap_and_bfd *) arg3;
380 struct vmap *vp;
381
382 vp = vmap_bfd->pvmap;
383
384 if ((bfd_get_section_flags (abfd, sect) & SEC_LOAD) == 0)
385 return;
386
387 if (DEPRECATED_STREQ (bfd_section_name (abfd, sect), ".text"))
388 {
389 vp->tstart = bfd_section_vma (abfd, sect);
390 vp->tend = vp->tstart + bfd_section_size (abfd, sect);
391 vp->tvma = bfd_section_vma (abfd, sect);
392 vp->toffs = sect->filepos;
393 }
394 else if (DEPRECATED_STREQ (bfd_section_name (abfd, sect), ".data"))
395 {
396 vp->dstart = bfd_section_vma (abfd, sect);
397 vp->dend = vp->dstart + bfd_section_size (abfd, sect);
398 vp->dvma = bfd_section_vma (abfd, sect);
399 }
400 /* Silently ignore other types of sections. (FIXME?) */
401 }
402
403 /* Make a vmap for ABFD which might be a member of the archive ARCH.
404 Return the new vmap. */
405
406 struct vmap *
map_vmap(bfd * abfd,bfd * arch)407 map_vmap (bfd *abfd, bfd *arch)
408 {
409 struct vmap_and_bfd vmap_bfd;
410 struct vmap *vp, **vpp;
411
412 vp = (struct vmap *) xmalloc (sizeof (*vp));
413 memset ((char *) vp, '\0', sizeof (*vp));
414 vp->nxt = 0;
415 vp->bfd = abfd;
416 vp->name = bfd_get_filename (arch ? arch : abfd);
417 vp->member = arch ? bfd_get_filename (abfd) : "";
418
419 vmap_bfd.pbfd = arch;
420 vmap_bfd.pvmap = vp;
421 bfd_map_over_sections (abfd, bfdsec_to_vmap, &vmap_bfd);
422
423 /* Find the end of the list and append. */
424 for (vpp = &vmap; *vpp; vpp = &(*vpp)->nxt)
425 ;
426 *vpp = vp;
427
428 return vp;
429 }
430
431 /* Read or write the exec file.
432
433 Args are address within a BFD file, address within gdb address-space,
434 length, and a flag indicating whether to read or write.
435
436 Result is a length:
437
438 0: We cannot handle this address and length.
439 > 0: We have handled N bytes starting at this address.
440 (If N == length, we did it all.) We might be able
441 to handle more bytes beyond this length, but no
442 promises.
443 < 0: We cannot handle this address, but if somebody
444 else handles (-N) bytes, we can start from there.
445
446 The same routine is used to handle both core and exec files;
447 we just tail-call it with more arguments to select between them. */
448
449 int
xfer_memory(CORE_ADDR memaddr,char * myaddr,int len,int write,struct mem_attrib * attrib,struct target_ops * target)450 xfer_memory (CORE_ADDR memaddr, char *myaddr, int len, int write,
451 struct mem_attrib *attrib,
452 struct target_ops *target)
453 {
454 int res;
455 struct section_table *p;
456 CORE_ADDR nextsectaddr, memend;
457 asection *section = NULL;
458
459 if (len <= 0)
460 internal_error (__FILE__, __LINE__, "failed internal consistency check");
461
462 if (overlay_debugging)
463 {
464 section = find_pc_overlay (memaddr);
465 if (pc_in_unmapped_range (memaddr, section))
466 memaddr = overlay_mapped_address (memaddr, section);
467 }
468
469 memend = memaddr + len;
470 nextsectaddr = memend;
471
472 for (p = target->to_sections; p < target->to_sections_end; p++)
473 {
474 if (overlay_debugging && section && p->the_bfd_section &&
475 strcmp (section->name, p->the_bfd_section->name) != 0)
476 continue; /* not the section we need */
477 if (memaddr >= p->addr)
478 {
479 if (memend <= p->endaddr)
480 {
481 /* Entire transfer is within this section. */
482 if (write)
483 res = bfd_set_section_contents (p->bfd, p->the_bfd_section,
484 myaddr, memaddr - p->addr,
485 len);
486 else
487 res = bfd_get_section_contents (p->bfd, p->the_bfd_section,
488 myaddr, memaddr - p->addr,
489 len);
490 return (res != 0) ? len : 0;
491 }
492 else if (memaddr >= p->endaddr)
493 {
494 /* This section ends before the transfer starts. */
495 continue;
496 }
497 else
498 {
499 /* This section overlaps the transfer. Just do half. */
500 len = p->endaddr - memaddr;
501 if (write)
502 res = bfd_set_section_contents (p->bfd, p->the_bfd_section,
503 myaddr, memaddr - p->addr,
504 len);
505 else
506 res = bfd_get_section_contents (p->bfd, p->the_bfd_section,
507 myaddr, memaddr - p->addr,
508 len);
509 return (res != 0) ? len : 0;
510 }
511 }
512 else
513 nextsectaddr = min (nextsectaddr, p->addr);
514 }
515
516 if (nextsectaddr >= memend)
517 return 0; /* We can't help */
518 else
519 return -(nextsectaddr - memaddr); /* Next boundary where we can help */
520 }
521
522
523 void
print_section_info(struct target_ops * t,bfd * abfd)524 print_section_info (struct target_ops *t, bfd *abfd)
525 {
526 struct section_table *p;
527 /* FIXME: "016l" is not wide enough when TARGET_ADDR_BIT > 64. */
528 char *fmt = TARGET_ADDR_BIT <= 32 ? "08l" : "016l";
529
530 printf_filtered ("\t`%s', ", bfd_get_filename (abfd));
531 wrap_here (" ");
532 printf_filtered ("file type %s.\n", bfd_get_target (abfd));
533 if (abfd == exec_bfd)
534 {
535 printf_filtered ("\tEntry point: ");
536 print_address_numeric (bfd_get_start_address (abfd), 1, gdb_stdout);
537 printf_filtered ("\n");
538 }
539 for (p = t->to_sections; p < t->to_sections_end; p++)
540 {
541 printf_filtered ("\t%s", local_hex_string_custom (p->addr, fmt));
542 printf_filtered (" - %s", local_hex_string_custom (p->endaddr, fmt));
543
544 /* FIXME: A format of "08l" is not wide enough for file offsets
545 larger than 4GB. OTOH, making it "016l" isn't desirable either
546 since most output will then be much wider than necessary. It
547 may make sense to test the size of the file and choose the
548 format string accordingly. */
549 if (info_verbose)
550 printf_filtered (" @ %s",
551 local_hex_string_custom (p->the_bfd_section->filepos, "08l"));
552 printf_filtered (" is %s", bfd_section_name (p->bfd, p->the_bfd_section));
553 if (p->bfd != abfd)
554 {
555 printf_filtered (" in %s", bfd_get_filename (p->bfd));
556 }
557 printf_filtered ("\n");
558 }
559 }
560
561 static void
exec_files_info(struct target_ops * t)562 exec_files_info (struct target_ops *t)
563 {
564 print_section_info (t, exec_bfd);
565
566 if (vmap)
567 {
568 struct vmap *vp;
569
570 printf_unfiltered ("\tMapping info for file `%s'.\n", vmap->name);
571 printf_unfiltered ("\t %*s %*s %*s %*s %8.8s %s\n",
572 strlen_paddr (), "tstart",
573 strlen_paddr (), "tend",
574 strlen_paddr (), "dstart",
575 strlen_paddr (), "dend",
576 "section",
577 "file(member)");
578
579 for (vp = vmap; vp; vp = vp->nxt)
580 printf_unfiltered ("\t0x%s 0x%s 0x%s 0x%s %s%s%s%s\n",
581 paddr (vp->tstart),
582 paddr (vp->tend),
583 paddr (vp->dstart),
584 paddr (vp->dend),
585 vp->name,
586 *vp->member ? "(" : "", vp->member,
587 *vp->member ? ")" : "");
588 }
589 }
590
591 /* msnyder 5/21/99:
592 exec_set_section_offsets sets the offsets of all the sections
593 in the exec objfile. */
594
595 void
exec_set_section_offsets(bfd_signed_vma text_off,bfd_signed_vma data_off,bfd_signed_vma bss_off)596 exec_set_section_offsets (bfd_signed_vma text_off, bfd_signed_vma data_off,
597 bfd_signed_vma bss_off)
598 {
599 struct section_table *sect;
600
601 for (sect = exec_ops.to_sections;
602 sect < exec_ops.to_sections_end;
603 sect++)
604 {
605 flagword flags;
606
607 flags = bfd_get_section_flags (exec_bfd, sect->the_bfd_section);
608
609 if (flags & SEC_CODE)
610 {
611 sect->addr += text_off;
612 sect->endaddr += text_off;
613 }
614 else if (flags & (SEC_DATA | SEC_LOAD))
615 {
616 sect->addr += data_off;
617 sect->endaddr += data_off;
618 }
619 else if (flags & SEC_ALLOC)
620 {
621 sect->addr += bss_off;
622 sect->endaddr += bss_off;
623 }
624 }
625 }
626
627 static void
set_section_command(char * args,int from_tty)628 set_section_command (char *args, int from_tty)
629 {
630 struct section_table *p;
631 char *secname;
632 unsigned seclen;
633 unsigned long secaddr;
634 char secprint[100];
635 long offset;
636
637 if (args == 0)
638 error ("Must specify section name and its virtual address");
639
640 /* Parse out section name */
641 for (secname = args; !isspace (*args); args++);
642 seclen = args - secname;
643
644 /* Parse out new virtual address */
645 secaddr = parse_and_eval_address (args);
646
647 for (p = exec_ops.to_sections; p < exec_ops.to_sections_end; p++)
648 {
649 if (!strncmp (secname, bfd_section_name (exec_bfd, p->the_bfd_section), seclen)
650 && bfd_section_name (exec_bfd, p->the_bfd_section)[seclen] == '\0')
651 {
652 offset = secaddr - p->addr;
653 p->addr += offset;
654 p->endaddr += offset;
655 if (from_tty)
656 exec_files_info (&exec_ops);
657 return;
658 }
659 }
660 if (seclen >= sizeof (secprint))
661 seclen = sizeof (secprint) - 1;
662 strncpy (secprint, secname, seclen);
663 secprint[seclen] = '\0';
664 error ("Section %s not found", secprint);
665 }
666
667 /* If mourn is being called in all the right places, this could be say
668 `gdb internal error' (since generic_mourn calls
669 breakpoint_init_inferior). */
670
671 static int
ignore(CORE_ADDR addr,char * contents)672 ignore (CORE_ADDR addr, char *contents)
673 {
674 return 0;
675 }
676
677 /* Find mapped memory. */
678
679 extern void
exec_set_find_memory_regions(int (* func)(int (*)(CORE_ADDR,unsigned long,int,int,int,void *),void *))680 exec_set_find_memory_regions (int (*func) (int (*) (CORE_ADDR,
681 unsigned long,
682 int, int, int,
683 void *),
684 void *))
685 {
686 exec_ops.to_find_memory_regions = func;
687 }
688
689 static char *exec_make_note_section (bfd *, int *);
690
691 /* Fill in the exec file target vector. Very few entries need to be
692 defined. */
693
694 static void
init_exec_ops(void)695 init_exec_ops (void)
696 {
697 exec_ops.to_shortname = "exec";
698 exec_ops.to_longname = "Local exec file";
699 exec_ops.to_doc = "Use an executable file as a target.\n\
700 Specify the filename of the executable file.";
701 exec_ops.to_open = exec_open;
702 exec_ops.to_close = exec_close;
703 exec_ops.to_attach = find_default_attach;
704 exec_ops.to_xfer_memory = xfer_memory;
705 exec_ops.to_files_info = exec_files_info;
706 exec_ops.to_insert_breakpoint = ignore;
707 exec_ops.to_remove_breakpoint = ignore;
708 exec_ops.to_create_inferior = find_default_create_inferior;
709 exec_ops.to_stratum = file_stratum;
710 exec_ops.to_has_memory = 1;
711 exec_ops.to_make_corefile_notes = exec_make_note_section;
712 exec_ops.to_magic = OPS_MAGIC;
713 }
714
715 void
_initialize_exec(void)716 _initialize_exec (void)
717 {
718 struct cmd_list_element *c;
719
720 init_exec_ops ();
721
722 if (!dbx_commands)
723 {
724 c = add_cmd ("file", class_files, file_command,
725 "Use FILE as program to be debugged.\n\
726 It is read for its symbols, for getting the contents of pure memory,\n\
727 and it is the program executed when you use the `run' command.\n\
728 If FILE cannot be found as specified, your execution directory path\n\
729 ($PATH) is searched for a command of that name.\n\
730 No arg means to have no executable file and no symbols.", &cmdlist);
731 set_cmd_completer (c, filename_completer);
732 }
733
734 c = add_cmd ("exec-file", class_files, exec_file_command,
735 "Use FILE as program for getting contents of pure memory.\n\
736 If FILE cannot be found as specified, your execution directory path\n\
737 is searched for a command of that name.\n\
738 No arg means have no executable file.", &cmdlist);
739 set_cmd_completer (c, filename_completer);
740
741 add_com ("section", class_files, set_section_command,
742 "Change the base address of section SECTION of the exec file to ADDR.\n\
743 This can be used if the exec file does not contain section addresses,\n\
744 (such as in the a.out format), or when the addresses specified in the\n\
745 file itself are wrong. Each section must be changed separately. The\n\
746 ``info files'' command lists all the sections and their addresses.");
747
748 add_show_from_set
749 (add_set_cmd ("write", class_support, var_boolean, (char *) &write_files,
750 "Set writing into executable and core files.",
751 &setlist),
752 &showlist);
753
754 add_target (&exec_ops);
755 }
756
757 static char *
exec_make_note_section(bfd * obfd,int * note_size)758 exec_make_note_section (bfd *obfd, int *note_size)
759 {
760 error ("Can't create a corefile");
761 }
762