Bug Summary

File:src/gnu/usr.bin/binutils/gdb/exec.c
Warning:line 108, column 4
Value stored to 'need_symtab_cleanup' is never read

Annotated Source Code

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clang -cc1 -cc1 -triple amd64-unknown-openbsd7.0 -analyze -disable-free -disable-llvm-verifier -discard-value-names -main-file-name exec.c -analyzer-store=region -analyzer-opt-analyze-nested-blocks -analyzer-checker=core -analyzer-checker=apiModeling -analyzer-checker=unix -analyzer-checker=deadcode -analyzer-checker=security.insecureAPI.UncheckedReturn -analyzer-checker=security.insecureAPI.getpw -analyzer-checker=security.insecureAPI.gets -analyzer-checker=security.insecureAPI.mktemp -analyzer-checker=security.insecureAPI.mkstemp -analyzer-checker=security.insecureAPI.vfork -analyzer-checker=nullability.NullPassedToNonnull -analyzer-checker=nullability.NullReturnedFromNonnull -analyzer-output plist -w -setup-static-analyzer -mrelocation-model pic -pic-level 1 -pic-is-pie -mframe-pointer=all -relaxed-aliasing -fno-rounding-math -mconstructor-aliases -munwind-tables -target-cpu x86-64 -target-feature +retpoline-indirect-calls -target-feature +retpoline-indirect-branches -tune-cpu generic -debugger-tuning=gdb -fcoverage-compilation-dir=/usr/src/gnu/usr.bin/binutils/obj/gdb -resource-dir /usr/local/lib/clang/13.0.0 -D PIE_DEFAULT=1 -I . -I /usr/src/gnu/usr.bin/binutils/gdb -I /usr/src/gnu/usr.bin/binutils/gdb/config -D LOCALEDIR="/usr/share/locale" -D HAVE_CONFIG_H -I /usr/src/gnu/usr.bin/binutils/gdb/../include/opcode -I ../bfd -I /usr/src/gnu/usr.bin/binutils/gdb/../bfd -I /usr/src/gnu/usr.bin/binutils/gdb/../include -I ../intl -I /usr/src/gnu/usr.bin/binutils/gdb/../intl -D MI_OUT=1 -D TUI=1 -internal-isystem /usr/local/lib/clang/13.0.0/include -internal-externc-isystem /usr/include -O2 -fdebug-compilation-dir=/usr/src/gnu/usr.bin/binutils/obj/gdb -ferror-limit 19 -fwrapv -D_RET_PROTECTOR -ret-protector -fgnuc-version=4.2.1 -fcommon -vectorize-loops -vectorize-slp -fno-builtin-malloc -fno-builtin-calloc -fno-builtin-realloc -fno-builtin-valloc -fno-builtin-free -fno-builtin-strdup -fno-builtin-strndup -analyzer-output=html -faddrsig -D__GCC_HAVE_DWARF2_CFI_ASM=1 -o /home/ben/Projects/vmm/scan-build/2022-01-12-194120-40624-1 -x c /usr/src/gnu/usr.bin/binutils/gdb/exec.c
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#include <fcntl.h>
37#include "readline/readline.h"
38#include "gdb_string.h"
39
40#include "gdbcore.h"
41
42#include <ctype.h>
43#include "gdb_stat.h"
44#ifndef O_BINARY0
45#define O_BINARY0 0
46#endif
47
48#include "xcoffsolib.h"
49
50struct vmap *map_vmap (bfd *, bfd *);
51
52void (*deprecated_file_changed_hook) (char *);
53
54/* Prototypes for local functions */
55
56static void exec_close (int);
57
58static void file_command (char *, int);
59
60static void set_section_command (char *, int);
61
62static void exec_files_info (struct target_ops *);
63
64static int ignore (CORE_ADDR, char *);
65
66static void init_exec_ops (void);
67
68void _initialize_exec (void);
69
70/* The target vector for executable files. */
71
72struct target_ops exec_ops;
73
74/* The Binary File Descriptor handle for the executable file. */
75
76bfd *exec_bfd = NULL((void*)0);
77
78/* Whether to open exec and core files read-only or read-write. */
79
80int write_files = 0;
81
82struct vmap *vmap;
83
84void
85exec_open (char *args, int from_tty)
86{
87 target_preopen (from_tty);
88 exec_file_attach (args, from_tty);
89}
90
91static void
92exec_close (int quitting)
93{
94 int need_symtab_cleanup = 0;
95 struct vmap *vp, *nxt;
96
97 for (nxt = vmap; nxt != NULL((void*)0);)
98 {
99 vp = nxt;
100 nxt = vp->nxt;
101
102 /* if there is an objfile associated with this bfd,
103 free_objfile() will do proper cleanup of objfile *and* bfd. */
104
105 if (vp->objfile)
106 {
107 free_objfile (vp->objfile);
108 need_symtab_cleanup = 1;
Value stored to 'need_symtab_cleanup' is never read
109 }
110 else if (vp->bfd != exec_bfd)
111 /* FIXME-leak: We should be freeing vp->name too, I think. */
112 if (!bfd_close (vp->bfd))
113 warning ("cannot close \"%s\": %s",
114 vp->name, bfd_errmsg (bfd_get_error ()));
115
116 /* FIXME: This routine is #if 0'd in symfile.c. What should we
117 be doing here? Should we just free everything in
118 vp->objfile->symtabs? Should free_objfile do that?
119 FIXME-as-well: free_objfile already free'd vp->name, so it isn't
120 valid here. */
121 free_named_symtabs (vp->name);
122 xfree (vp);
123 }
124
125 vmap = NULL((void*)0);
126
127 if (exec_bfd)
128 {
129 char *name = bfd_get_filename (exec_bfd)((char *) (exec_bfd)->filename);
130
131 if (!bfd_close (exec_bfd))
132 warning ("cannot close \"%s\": %s",
133 name, bfd_errmsg (bfd_get_error ()));
134 xfree (name);
135 exec_bfd = NULL((void*)0);
136 }
137
138 if (exec_ops.to_sections)
139 {
140 xfree (exec_ops.to_sections);
141 exec_ops.to_sections = NULL((void*)0);
142 exec_ops.to_sections_end = NULL((void*)0);
143 }
144}
145
146void
147exec_file_clear (int from_tty)
148{
149 /* Remove exec file. */
150 unpush_target (&exec_ops);
151
152 if (from_tty)
153 printf_unfiltered ("No executable file now.\n");
154}
155
156/* Process the first arg in ARGS as the new exec file.
157
158 This function is intended to be behave essentially the same
159 as exec_file_command, except that the latter will detect when
160 a target is being debugged, and will ask the user whether it
161 should be shut down first. (If the answer is "no", then the
162 new file is ignored.)
163
164 This file is used by exec_file_command, to do the work of opening
165 and processing the exec file after any prompting has happened.
166
167 And, it is used by child_attach, when the attach command was
168 given a pid but not a exec pathname, and the attach command could
169 figure out the pathname from the pid. (In this case, we shouldn't
170 ask the user whether the current target should be shut down --
171 we're supplying the exec pathname late for good reason.)
172
173 ARGS is assumed to be the filename. */
174
175void
176exec_file_attach (char *filename, int from_tty)
177{
178 /* Remove any previous exec file. */
179 unpush_target (&exec_ops);
180
181 /* Now open and digest the file the user requested, if any. */
182
183 if (!filename)
184 {
185 if (from_tty)
186 printf_unfiltered ("No executable file now.\n");
187 }
188 else
189 {
190 char *scratch_pathname;
191 int scratch_chan;
192
193 scratch_chan = openp (getenv ("PATH"), OPF_TRY_CWD_FIRST0x01, filename,
194 write_files ? O_RDWR0x0002 | O_BINARY0 : O_RDONLY0x0000 | O_BINARY0, 0,
195 &scratch_pathname);
196#if defined(__GO32__) || defined(_WIN32) || defined(__CYGWIN__)
197 if (scratch_chan < 0)
198 {
199 char *exename = alloca (strlen (filename) + 5)__builtin_alloca(strlen (filename) + 5);
200 strcat (strcpy (exename, filename), ".exe");
201 scratch_chan = openp (getenv ("PATH"), OPF_TRY_CWD_FIRST0x01, exename,
202 write_files ? O_RDWR0x0002 | O_BINARY0 : O_RDONLY0x0000 | O_BINARY0, 0,
203 &scratch_pathname);
204 }
205#endif
206 if (scratch_chan < 0)
207 perror_with_name (filename);
208 exec_bfd = bfd_fdopenr (scratch_pathname, gnutarget, scratch_chan);
209
210 if (!exec_bfd)
211 error ("\"%s\": could not open as an executable file: %s",
212 scratch_pathname, bfd_errmsg (bfd_get_error ()));
213
214 /* At this point, scratch_pathname and exec_bfd->name both point to the
215 same malloc'd string. However exec_close() will attempt to free it
216 via the exec_bfd->name pointer, so we need to make another copy and
217 leave exec_bfd as the new owner of the original copy. */
218 scratch_pathname = xstrdup (scratch_pathname);
219 make_cleanup (xfree, scratch_pathname);
220
221 if (!bfd_check_format (exec_bfd, bfd_object))
222 {
223 /* Make sure to close exec_bfd, or else "run" might try to use
224 it. */
225 exec_close (0);
226 error ("\"%s\": not in executable format: %s",
227 scratch_pathname, bfd_errmsg (bfd_get_error ()));
228 }
229
230 /* FIXME - This should only be run for RS6000, but the ifdef is a poor
231 way to accomplish. */
232#ifdef DEPRECATED_IBM6000_TARGET
233 /* Setup initial vmap. */
234
235 map_vmap (exec_bfd, 0);
236 if (vmap == NULL((void*)0))
237 {
238 /* Make sure to close exec_bfd, or else "run" might try to use
239 it. */
240 exec_close (0);
241 error ("\"%s\": can't find the file sections: %s",
242 scratch_pathname, bfd_errmsg (bfd_get_error ()));
243 }
244#endif /* DEPRECATED_IBM6000_TARGET */
245
246 if (build_section_table (exec_bfd, &exec_ops.to_sections,
247 &exec_ops.to_sections_end))
248 {
249 /* Make sure to close exec_bfd, or else "run" might try to use
250 it. */
251 exec_close (0);
252 error ("\"%s\": can't find the file sections: %s",
253 scratch_pathname, bfd_errmsg (bfd_get_error ()));
254 }
255
256#ifdef DEPRECATED_HPUX_TEXT_END
257 DEPRECATED_HPUX_TEXT_END (&exec_ops);
258#endif
259
260 validate_files ();
261
262 set_gdbarch_from_file (exec_bfd);
263
264 push_target (&exec_ops);
265
266 /* Tell display code (if any) about the changed file name. */
267 if (deprecated_exec_file_display_hook)
268 (*deprecated_exec_file_display_hook) (filename);
269 }
270 bfd_cache_close_all ();
271}
272
273/* Process the first arg in ARGS as the new exec file.
274
275 Note that we have to explicitly ignore additional args, since we can
276 be called from file_command(), which also calls symbol_file_command()
277 which can take multiple args.
278
279 If ARGS is NULL, we just want to close the exec file. */
280
281static void
282exec_file_command (char *args, int from_tty)
283{
284 char **argv;
285 char *filename;
286
287 target_preopen (from_tty);
288
289 if (args)
290 {
291 /* Scan through the args and pick up the first non option arg
292 as the filename. */
293
294 argv = buildargv (args);
295 if (argv == NULL((void*)0))
296 nomem (0);
297
298 make_cleanup_freeargv (argv);
299
300 for (; (*argv != NULL((void*)0)) && (**argv == '-'); argv++)
301 {;
302 }
303 if (*argv == NULL((void*)0))
304 error ("No executable file name was specified");
305
306 filename = tilde_expand (*argv);
307 make_cleanup (xfree, filename);
308 exec_file_attach (filename, from_tty);
309 }
310 else
311 exec_file_attach (NULL((void*)0), from_tty);
312}
313
314/* Set both the exec file and the symbol file, in one command.
315 What a novelty. Why did GDB go through four major releases before this
316 command was added? */
317
318static void
319file_command (char *arg, int from_tty)
320{
321 /* FIXME, if we lose on reading the symbol file, we should revert
322 the exec file, but that's rough. */
323 exec_file_command (arg, from_tty);
324 symbol_file_command (arg, from_tty);
325 if (deprecated_file_changed_hook)
326 deprecated_file_changed_hook (arg);
327}
328
329
330/* Locate all mappable sections of a BFD file.
331 table_pp_char is a char * to get it through bfd_map_over_sections;
332 we cast it back to its proper type. */
333
334static void
335add_to_section_table (bfd *abfd, struct bfd_section *asect,
336 void *table_pp_char)
337{
338 struct section_table **table_pp = (struct section_table **) table_pp_char;
339 flagword aflag;
340
341 aflag = bfd_get_section_flags (abfd, asect)((asect)->flags + 0);
342 if (!(aflag & SEC_ALLOC0x001))
343 return;
344 if (0 == bfd_section_size (abfd, asect)((asect)->_raw_size))
345 return;
346 (*table_pp)->bfd = abfd;
347 (*table_pp)->the_bfd_section = asect;
348 (*table_pp)->addr = bfd_section_vma (abfd, asect)((asect)->vma);
349 (*table_pp)->endaddr = (*table_pp)->addr + bfd_section_size (abfd, asect)((asect)->_raw_size);
350 (*table_pp)++;
351}
352
353/* Builds a section table, given args BFD, SECTABLE_PTR, SECEND_PTR.
354 Returns 0 if OK, 1 on error. */
355
356int
357build_section_table (struct bfd *some_bfd, struct section_table **start,
358 struct section_table **end)
359{
360 unsigned count;
361
362 count = bfd_count_sections (some_bfd)((some_bfd)->section_count);
363 if (*start)
364 xfree (* start);
365 *start = (struct section_table *) xmalloc (count * sizeof (**start));
366 *end = *start;
367 bfd_map_over_sections (some_bfd, add_to_section_table, (char *) end);
368 if (*end > *start + count)
369 internal_error (__FILE__"/usr/src/gnu/usr.bin/binutils/gdb/exec.c", __LINE__369, "failed internal consistency check");
370 /* We could realloc the table, but it probably loses for most files. */
371 return 0;
372}
373
374static void
375bfdsec_to_vmap (struct bfd *abfd, struct bfd_section *sect, void *arg3)
376{
377 struct vmap_and_bfd *vmap_bfd = (struct vmap_and_bfd *) arg3;
378 struct vmap *vp;
379
380 vp = vmap_bfd->pvmap;
381
382 if ((bfd_get_section_flags (abfd, sect)((sect)->flags + 0) & SEC_LOAD0x002) == 0)
383 return;
384
385 if (DEPRECATED_STREQ (bfd_section_name (abfd, sect), ".text")(strcmp ((((sect)->name)), (".text")) == 0))
386 {
387 vp->tstart = bfd_section_vma (abfd, sect)((sect)->vma);
388 vp->tend = vp->tstart + bfd_section_size (abfd, sect)((sect)->_raw_size);
389 vp->tvma = bfd_section_vma (abfd, sect)((sect)->vma);
390 vp->toffs = sect->filepos;
391 }
392 else if (DEPRECATED_STREQ (bfd_section_name (abfd, sect), ".data")(strcmp ((((sect)->name)), (".data")) == 0))
393 {
394 vp->dstart = bfd_section_vma (abfd, sect)((sect)->vma);
395 vp->dend = vp->dstart + bfd_section_size (abfd, sect)((sect)->_raw_size);
396 vp->dvma = bfd_section_vma (abfd, sect)((sect)->vma);
397 }
398 /* Silently ignore other types of sections. (FIXME?) */
399}
400
401/* Make a vmap for ABFD which might be a member of the archive ARCH.
402 Return the new vmap. */
403
404struct vmap *
405map_vmap (bfd *abfd, bfd *arch)
406{
407 struct vmap_and_bfd vmap_bfd;
408 struct vmap *vp, **vpp;
409
410 vp = (struct vmap *) xmalloc (sizeof (*vp));
411 memset ((char *) vp, '\0', sizeof (*vp));
412 vp->nxt = 0;
413 vp->bfd = abfd;
414 vp->name = bfd_get_filename (arch ? arch : abfd)((char *) (arch ? arch : abfd)->filename);
415 vp->member = arch ? bfd_get_filename (abfd)((char *) (abfd)->filename) : "";
416
417 vmap_bfd.pbfd = arch;
418 vmap_bfd.pvmap = vp;
419 bfd_map_over_sections (abfd, bfdsec_to_vmap, &vmap_bfd);
420
421 /* Find the end of the list and append. */
422 for (vpp = &vmap; *vpp; vpp = &(*vpp)->nxt)
423 ;
424 *vpp = vp;
425
426 return vp;
427}
428
429/* Read or write the exec file.
430
431 Args are address within a BFD file, address within gdb address-space,
432 length, and a flag indicating whether to read or write.
433
434 Result is a length:
435
436 0: We cannot handle this address and length.
437 > 0: We have handled N bytes starting at this address.
438 (If N == length, we did it all.) We might be able
439 to handle more bytes beyond this length, but no
440 promises.
441 < 0: We cannot handle this address, but if somebody
442 else handles (-N) bytes, we can start from there.
443
444 The same routine is used to handle both core and exec files;
445 we just tail-call it with more arguments to select between them. */
446
447int
448xfer_memory (CORE_ADDR memaddr, char *myaddr, int len, int write,
449 struct mem_attrib *attrib,
450 struct target_ops *target)
451{
452 int res;
453 struct section_table *p;
454 CORE_ADDR nextsectaddr, memend;
455 asection *section = NULL((void*)0);
456
457 if (len <= 0)
458 internal_error (__FILE__"/usr/src/gnu/usr.bin/binutils/gdb/exec.c", __LINE__458, "failed internal consistency check");
459
460 if (overlay_debugging)
461 {
462 section = find_pc_overlay (memaddr);
463 if (pc_in_unmapped_range (memaddr, section))
464 memaddr = overlay_mapped_address (memaddr, section);
465 }
466
467 memend = memaddr + len;
468 nextsectaddr = memend;
469
470 for (p = target->to_sections; p < target->to_sections_end; p++)
471 {
472 if (overlay_debugging && section && p->the_bfd_section &&
473 strcmp (section->name, p->the_bfd_section->name) != 0)
474 continue; /* not the section we need */
475 if (memaddr >= p->addr)
476 {
477 if (memend <= p->endaddr)
478 {
479 /* Entire transfer is within this section. */
480 if (write)
481 res = bfd_set_section_contents (p->bfd, p->the_bfd_section,
482 myaddr, memaddr - p->addr,
483 len);
484 else
485 res = bfd_get_section_contents (p->bfd, p->the_bfd_section,
486 myaddr, memaddr - p->addr,
487 len);
488 return (res != 0) ? len : 0;
489 }
490 else if (memaddr >= p->endaddr)
491 {
492 /* This section ends before the transfer starts. */
493 continue;
494 }
495 else
496 {
497 /* This section overlaps the transfer. Just do half. */
498 len = p->endaddr - memaddr;
499 if (write)
500 res = bfd_set_section_contents (p->bfd, p->the_bfd_section,
501 myaddr, memaddr - p->addr,
502 len);
503 else
504 res = bfd_get_section_contents (p->bfd, p->the_bfd_section,
505 myaddr, memaddr - p->addr,
506 len);
507 return (res != 0) ? len : 0;
508 }
509 }
510 else
511 nextsectaddr = min (nextsectaddr, p->addr)((nextsectaddr) < (p->addr) ? (nextsectaddr) : (p->addr
));
512 }
513
514 if (nextsectaddr >= memend)
515 return 0; /* We can't help */
516 else
517 return -(nextsectaddr - memaddr); /* Next boundary where we can help */
518}
519
520
521void
522print_section_info (struct target_ops *t, bfd *abfd)
523{
524 struct section_table *p;
525 /* FIXME: 16 is not wide enough when TARGET_ADDR_BIT > 64. */
526 int wid = TARGET_ADDR_BIT(gdbarch_addr_bit (current_gdbarch)) <= 32 ? 8 : 16;
527
528 printf_filtered ("\t`%s', ", bfd_get_filename (abfd)((char *) (abfd)->filename));
529 wrap_here (" ");
530 printf_filtered ("file type %s.\n", bfd_get_target (abfd)((abfd)->xvec->name));
531 if (abfd == exec_bfd)
532 {
533 printf_filtered ("\tEntry point: ");
534 print_address_numeric (bfd_get_start_address (abfd)((abfd)->start_address), 1, gdb_stdout);
535 printf_filtered ("\n");
536 }
537 for (p = t->to_sections; p < t->to_sections_end; p++)
538 {
539 printf_filtered ("\t%s", hex_string_custom (p->addr, wid));
540 printf_filtered (" - %s", hex_string_custom (p->endaddr, wid));
541
542 /* FIXME: A format of "08l" is not wide enough for file offsets
543 larger than 4GB. OTOH, making it "016l" isn't desirable either
544 since most output will then be much wider than necessary. It
545 may make sense to test the size of the file and choose the
546 format string accordingly. */
547 if (info_verbose)
548 printf_filtered (" @ %s",
549 hex_string_custom (p->the_bfd_section->filepos, 8));
550 printf_filtered (" is %s", bfd_section_name (p->bfd, p->the_bfd_section)((p->the_bfd_section)->name));
551 if (p->bfd != abfd)
552 {
553 printf_filtered (" in %s", bfd_get_filename (p->bfd)((char *) (p->bfd)->filename));
554 }
555 printf_filtered ("\n");
556 }
557}
558
559static void
560exec_files_info (struct target_ops *t)
561{
562 print_section_info (t, exec_bfd);
563
564 if (vmap)
565 {
566 struct vmap *vp;
567
568 printf_unfiltered ("\tMapping info for file `%s'.\n", vmap->name);
569 printf_unfiltered ("\t %*s %*s %*s %*s %8.8s %s\n",
570 strlen_paddr (), "tstart",
571 strlen_paddr (), "tend",
572 strlen_paddr (), "dstart",
573 strlen_paddr (), "dend",
574 "section",
575 "file(member)");
576
577 for (vp = vmap; vp; vp = vp->nxt)
578 printf_unfiltered ("\t0x%s 0x%s 0x%s 0x%s %s%s%s%s\n",
579 paddr (vp->tstart),
580 paddr (vp->tend),
581 paddr (vp->dstart),
582 paddr (vp->dend),
583 vp->name,
584 *vp->member ? "(" : "", vp->member,
585 *vp->member ? ")" : "");
586 }
587}
588
589/* msnyder 5/21/99:
590 exec_set_section_offsets sets the offsets of all the sections
591 in the exec objfile. */
592
593void
594exec_set_section_offsets (bfd_signed_vma text_off, bfd_signed_vma data_off,
595 bfd_signed_vma bss_off)
596{
597 struct section_table *sect;
598
599 for (sect = exec_ops.to_sections;
600 sect < exec_ops.to_sections_end;
601 sect++)
602 {
603 flagword flags;
604
605 flags = bfd_get_section_flags (exec_bfd, sect->the_bfd_section)((sect->the_bfd_section)->flags + 0);
606
607 if (flags & SEC_CODE0x020)
608 {
609 sect->addr += text_off;
610 sect->endaddr += text_off;
611 }
612 else if (flags & (SEC_DATA0x040 | SEC_LOAD0x002))
613 {
614 sect->addr += data_off;
615 sect->endaddr += data_off;
616 }
617 else if (flags & SEC_ALLOC0x001)
618 {
619 sect->addr += bss_off;
620 sect->endaddr += bss_off;
621 }
622 }
623}
624
625static void
626set_section_command (char *args, int from_tty)
627{
628 struct section_table *p;
629 char *secname;
630 unsigned seclen;
631 unsigned long secaddr;
632 char secprint[100];
633 long offset;
634
635 if (args == 0)
636 error ("Must specify section name and its virtual address");
637
638 /* Parse out section name */
639 for (secname = args; !isspace (*args); args++);
640 seclen = args - secname;
641
642 /* Parse out new virtual address */
643 secaddr = parse_and_eval_address (args);
644
645 for (p = exec_ops.to_sections; p < exec_ops.to_sections_end; p++)
646 {
647 if (!strncmp (secname, bfd_section_name (exec_bfd, p->the_bfd_section)((p->the_bfd_section)->name), seclen)
648 && bfd_section_name (exec_bfd, p->the_bfd_section)((p->the_bfd_section)->name)[seclen] == '\0')
649 {
650 offset = secaddr - p->addr;
651 p->addr += offset;
652 p->endaddr += offset;
653 if (from_tty)
654 exec_files_info (&exec_ops);
655 return;
656 }
657 }
658 if (seclen >= sizeof (secprint))
659 seclen = sizeof (secprint) - 1;
660 strncpy (secprint, secname, seclen);
661 secprint[seclen] = '\0';
662 error ("Section %s not found", secprint);
663}
664
665/* If mourn is being called in all the right places, this could be say
666 `gdb internal error' (since generic_mourn calls
667 breakpoint_init_inferior). */
668
669static int
670ignore (CORE_ADDR addr, char *contents)
671{
672 return 0;
673}
674
675/* Find mapped memory. */
676
677extern void
678exec_set_find_memory_regions (int (*func) (int (*) (CORE_ADDR,
679 unsigned long,
680 int, int, int,
681 void *),
682 void *))
683{
684 exec_ops.to_find_memory_regions = func;
685}
686
687static char *exec_make_note_section (bfd *, int *);
688
689/* Fill in the exec file target vector. Very few entries need to be
690 defined. */
691
692static void
693init_exec_ops (void)
694{
695 exec_ops.to_shortname = "exec";
696 exec_ops.to_longname = "Local exec file";
697 exec_ops.to_doc = "Use an executable file as a target.\n\
698Specify the filename of the executable file.";
699 exec_ops.to_open = exec_open;
700 exec_ops.to_close = exec_close;
701 exec_ops.to_attach = find_default_attach;
702 exec_ops.deprecated_xfer_memory = xfer_memory;
703 exec_ops.to_files_info = exec_files_info;
704 exec_ops.to_insert_breakpoint = ignore;
705 exec_ops.to_remove_breakpoint = ignore;
706 exec_ops.to_create_inferior = find_default_create_inferior;
707 exec_ops.to_stratum = file_stratum;
708 exec_ops.to_has_memory = 1;
709 exec_ops.to_make_corefile_notes = exec_make_note_section;
710 exec_ops.to_magic = OPS_MAGIC3840;
711}
712
713void
714_initialize_exec (void)
715{
716 struct cmd_list_element *c;
717
718 init_exec_ops ();
719
720 if (!dbx_commands)
721 {
722 c = add_cmd ("file", class_files, file_command,
723 "Use FILE as program to be debugged.\n\
724It is read for its symbols, for getting the contents of pure memory,\n\
725and it is the program executed when you use the `run' command.\n\
726If FILE cannot be found as specified, your execution directory path\n\
727($PATH) is searched for a command of that name.\n\
728No arg means to have no executable file and no symbols.", &cmdlist);
729 set_cmd_completer (c, filename_completer);
730 }
731
732 c = add_cmd ("exec-file", class_files, exec_file_command,
733 "Use FILE as program for getting contents of pure memory.\n\
734If FILE cannot be found as specified, your execution directory path\n\
735is searched for a command of that name.\n\
736No arg means have no executable file.", &cmdlist);
737 set_cmd_completer (c, filename_completer);
738
739 add_com ("section", class_files, set_section_command,
740 "Change the base address of section SECTION of the exec file to ADDR.\n\
741This can be used if the exec file does not contain section addresses,\n\
742(such as in the a.out format), or when the addresses specified in the\n\
743file itself are wrong. Each section must be changed separately. The\n\
744``info files'' command lists all the sections and their addresses.");
745
746 deprecated_add_show_from_set
747 (add_set_cmd ("write", class_support, var_boolean, (char *) &write_files,
748 "Set writing into executable and core files.",
749 &setlist),
750 &showlist);
751
752 add_target (&exec_ops);
753}
754
755static char *
756exec_make_note_section (bfd *obfd, int *note_size)
757{
758 error ("Can't create a corefile");
759}