1 /* Work with executable files, for GDB.
3 Copyright (C) 1988-2020 Free Software Foundation, Inc.
5 This file is part of GDB.
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.
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.
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/>. */
26 #include "filenames.h"
29 #include "completer.h"
32 #include "observable.h"
33 #include "arch-utils.h"
34 #include "gdbthread.h"
35 #include "progspace.h"
36 #include "progspace-and-thread.h"
43 #include "readline/tilde.h"
50 #include "gdbsupport/pathstuff.h"
51 #include "cli/cli-style.h"
53 void (*deprecated_file_changed_hook
) (const char *);
55 static const target_info exec_target_info
= {
57 N_("Local exec file"),
58 N_("Use an executable file as a target.\n\
59 Specify the filename of the executable file.")
62 /* The target vector for executable files. */
64 struct exec_target final
: public target_ops
66 const target_info
&info () const override
67 { return exec_target_info
; }
69 strata
stratum () const override
{ return file_stratum
; }
71 void close () override
;
72 enum target_xfer_status
xfer_partial (enum target_object object
,
75 const gdb_byte
*writebuf
,
76 ULONGEST offset
, ULONGEST len
,
77 ULONGEST
*xfered_len
) override
;
78 struct target_section_table
*get_section_table () override
;
79 void files_info () override
;
81 bool has_memory () override
;
82 char *make_corefile_notes (bfd
*, int *) override
;
83 int find_memory_regions (find_memory_region_ftype func
, void *data
) override
;
86 static exec_target exec_ops
;
88 /* How to handle a mismatch between the current exec file and the exec
89 file determined from target. */
91 static const char *const exec_file_mismatch_names
[]
92 = {"ask", "warn", "off", NULL
};
93 enum exec_file_mismatch_mode
95 exec_file_mismatch_ask
, exec_file_mismatch_warn
, exec_file_mismatch_off
97 static const char *exec_file_mismatch
= exec_file_mismatch_names
[0];
98 static enum exec_file_mismatch_mode exec_file_mismatch_mode
99 = exec_file_mismatch_ask
;
103 show_exec_file_mismatch_command (struct ui_file
*file
, int from_tty
,
104 struct cmd_list_element
*c
, const char *value
)
106 fprintf_filtered (gdb_stdout
,
107 _("exec-file-mismatch handling is currently \"%s\".\n"),
108 exec_file_mismatch_names
[exec_file_mismatch_mode
]);
111 /* Set command. Change the setting for range checking. */
113 set_exec_file_mismatch_command (const char *ignore
,
114 int from_tty
, struct cmd_list_element
*c
)
116 for (enum exec_file_mismatch_mode mode
= exec_file_mismatch_ask
;
118 mode
= static_cast<enum exec_file_mismatch_mode
>(1 + (int) mode
))
120 if (strcmp (exec_file_mismatch
, exec_file_mismatch_names
[mode
]) == 0)
122 exec_file_mismatch_mode
= mode
;
125 if (mode
== exec_file_mismatch_off
)
126 internal_error (__FILE__
, __LINE__
,
127 _("Unrecognized exec-file-mismatch setting: \"%s\""),
132 /* Whether to open exec and core files read-only or read-write. */
134 bool write_files
= false;
136 show_write_files (struct ui_file
*file
, int from_tty
,
137 struct cmd_list_element
*c
, const char *value
)
139 fprintf_filtered (file
, _("Writing into executable and core files is %s.\n"),
145 exec_target_open (const char *args
, int from_tty
)
147 target_preopen (from_tty
);
148 exec_file_attach (args
, from_tty
);
151 /* Close and clear exec_bfd. If we end up with no target sections to
152 read memory from, this unpushes the exec_ops target. */
159 bfd
*abfd
= exec_bfd
;
161 gdb_bfd_unref (abfd
);
163 /* Removing target sections may close the exec_ops target.
164 Clear exec_bfd before doing so to prevent recursion. */
168 remove_target_sections (&exec_bfd
);
170 xfree (exec_filename
);
171 exec_filename
= NULL
;
175 /* This is the target_close implementation. Clears all target
176 sections and closes all executable bfds from all program spaces. */
179 exec_target::close ()
181 scoped_restore_current_program_space restore_pspace
;
183 for (struct program_space
*ss
: program_spaces
)
185 set_current_program_space (ss
);
186 clear_section_table (current_target_sections
);
194 try_open_exec_file (const char *exec_file_host
, struct inferior
*inf
,
195 symfile_add_flags add_flags
)
197 struct gdb_exception prev_err
;
199 /* exec_file_attach and symbol_file_add_main may throw an error if the file
200 cannot be opened either locally or remotely.
202 This happens for example, when the file is first found in the local
203 sysroot (above), and then disappears (a TOCTOU race), or when it doesn't
204 exist in the target filesystem, or when the file does exist, but
207 Even without a symbol file, the remote-based debugging session should
208 continue normally instead of ending abruptly. Hence we catch thrown
209 errors/exceptions in the following code. */
212 /* We must do this step even if exec_file_host is NULL, so that
213 exec_file_attach will clear state. */
214 exec_file_attach (exec_file_host
, add_flags
& SYMFILE_VERBOSE
);
216 catch (gdb_exception_error
&err
)
218 if (err
.message
!= NULL
)
219 warning ("%s", err
.what ());
221 prev_err
= std::move (err
);
224 if (exec_file_host
!= NULL
)
228 symbol_file_add_main (exec_file_host
, add_flags
);
230 catch (const gdb_exception_error
&err
)
232 if (!exception_print_same (prev_err
, err
))
233 warning ("%s", err
.what ());
241 validate_exec_file (int from_tty
)
243 /* If user asked to ignore the mismatch, do nothing. */
244 if (exec_file_mismatch_mode
== exec_file_mismatch_off
)
247 const char *current_exec_file
= get_exec_file (0);
248 struct inferior
*inf
= current_inferior ();
249 /* Try to determine a filename from the process itself. */
250 const char *pid_exec_file
= target_pid_to_exec_file (inf
->pid
);
251 bool build_id_mismatch
= false;
253 /* If we cannot validate the exec file, return. */
254 if (current_exec_file
== NULL
|| pid_exec_file
== NULL
)
257 /* Try validating via build-id, if available. This is the most
260 /* In case current_exec_file was changed, reopen_exec_file ensures
261 an up to date build_id (will do nothing if the file timestamp
262 did not change). If exec file changed, reopen_exec_file has
263 allocated another file name, so get_exec_file again. */
265 current_exec_file
= get_exec_file (0);
267 const bfd_build_id
*exec_file_build_id
= build_id_bfd_get (exec_bfd
);
268 if (exec_file_build_id
!= nullptr)
270 /* Prepend the target prefix, to force gdb_bfd_open to open the
271 file on the remote file system (if indeed remote). */
272 std::string target_pid_exec_file
273 = std::string (TARGET_SYSROOT_PREFIX
) + pid_exec_file
;
275 gdb_bfd_ref_ptr
abfd (gdb_bfd_open (target_pid_exec_file
.c_str (),
276 gnutarget
, -1, false));
279 const bfd_build_id
*target_exec_file_build_id
280 = build_id_bfd_get (abfd
.get ());
282 if (target_exec_file_build_id
!= nullptr)
284 if (exec_file_build_id
->size
== target_exec_file_build_id
->size
285 && memcmp (exec_file_build_id
->data
,
286 target_exec_file_build_id
->data
,
287 exec_file_build_id
->size
) == 0)
293 build_id_mismatch
= true;
298 if (build_id_mismatch
)
300 std::string
exec_file_target (pid_exec_file
);
302 /* In case the exec file is not local, exec_file_target has to point at
303 the target file system. */
304 if (is_target_filename (current_exec_file
) && !target_filesystem_is_local ())
305 exec_file_target
= TARGET_SYSROOT_PREFIX
+ exec_file_target
;
308 (_("Mismatch between current exec-file %ps\n"
309 "and automatically determined exec-file %ps\n"
310 "exec-file-mismatch handling is currently \"%s\""),
311 styled_string (file_name_style
.style (), current_exec_file
),
312 styled_string (file_name_style
.style (), exec_file_target
.c_str ()),
313 exec_file_mismatch_names
[exec_file_mismatch_mode
]);
314 if (exec_file_mismatch_mode
== exec_file_mismatch_ask
)
316 symfile_add_flags add_flags
= SYMFILE_MAINLINE
;
319 add_flags
|= SYMFILE_VERBOSE
;
320 add_flags
|= SYMFILE_ALWAYS_CONFIRM
;
324 symbol_file_add_main (exec_file_target
.c_str (), add_flags
);
325 exec_file_attach (exec_file_target
.c_str (), from_tty
);
327 catch (gdb_exception_error
&err
)
329 warning (_("loading %ps %s"),
330 styled_string (file_name_style
.style (),
331 exec_file_target
.c_str ()),
332 err
.message
!= NULL
? err
.what () : "error");
341 exec_file_locate_attach (int pid
, int defer_bp_reset
, int from_tty
)
343 char *exec_file_target
;
344 symfile_add_flags add_flags
= 0;
346 /* Do nothing if we already have an executable filename. */
347 if (get_exec_file (0) != NULL
)
350 /* Try to determine a filename from the process itself. */
351 exec_file_target
= target_pid_to_exec_file (pid
);
352 if (exec_file_target
== NULL
)
354 warning (_("No executable has been specified and target does not "
356 "determining executable automatically. "
357 "Try using the \"file\" command."));
361 gdb::unique_xmalloc_ptr
<char> exec_file_host
362 = exec_file_find (exec_file_target
, NULL
);
365 add_flags
|= SYMFILE_DEFER_BP_RESET
;
368 add_flags
|= SYMFILE_VERBOSE
;
370 /* Attempt to open the exec file. */
371 try_open_exec_file (exec_file_host
.get (), current_inferior (), add_flags
);
374 /* Set FILENAME as the new exec file.
376 This function is intended to be behave essentially the same
377 as exec_file_command, except that the latter will detect when
378 a target is being debugged, and will ask the user whether it
379 should be shut down first. (If the answer is "no", then the
380 new file is ignored.)
382 This file is used by exec_file_command, to do the work of opening
383 and processing the exec file after any prompting has happened.
385 And, it is used by child_attach, when the attach command was
386 given a pid but not a exec pathname, and the attach command could
387 figure out the pathname from the pid. (In this case, we shouldn't
388 ask the user whether the current target should be shut down --
389 we're supplying the exec pathname late for good reason.) */
392 exec_file_attach (const char *filename
, int from_tty
)
394 /* First, acquire a reference to the current exec_bfd. We release
395 this at the end of the function; but acquiring it now lets the
396 BFD cache return it if this call refers to the same file. */
397 gdb_bfd_ref_ptr exec_bfd_holder
= gdb_bfd_ref_ptr::new_reference (exec_bfd
);
399 /* Remove any previous exec file. */
402 /* Now open and digest the file the user requested, if any. */
407 printf_unfiltered (_("No executable file now.\n"));
409 set_gdbarch_from_file (NULL
);
413 int load_via_target
= 0;
414 const char *scratch_pathname
, *canonical_pathname
;
416 struct target_section
*sections
= NULL
, *sections_end
= NULL
;
419 if (is_target_filename (filename
))
421 if (target_filesystem_is_local ())
422 filename
+= strlen (TARGET_SYSROOT_PREFIX
);
427 gdb::unique_xmalloc_ptr
<char> canonical_storage
, scratch_storage
;
430 /* gdb_bfd_fopen does not support "target:" filenames. */
432 warning (_("writing into executable files is "
433 "not supported for %s sysroots"),
434 TARGET_SYSROOT_PREFIX
);
436 scratch_pathname
= filename
;
438 canonical_pathname
= scratch_pathname
;
442 scratch_chan
= openp (getenv ("PATH"), OPF_TRY_CWD_FIRST
,
443 filename
, write_files
?
444 O_RDWR
| O_BINARY
: O_RDONLY
| O_BINARY
,
446 #if defined(__GO32__) || defined(_WIN32) || defined(__CYGWIN__)
447 if (scratch_chan
< 0)
449 int first_errno
= errno
;
450 char *exename
= (char *) alloca (strlen (filename
) + 5);
452 strcat (strcpy (exename
, filename
), ".exe");
453 scratch_chan
= openp (getenv ("PATH"), OPF_TRY_CWD_FIRST
,
454 exename
, write_files
?
456 : O_RDONLY
| O_BINARY
,
458 if (scratch_chan
< 0)
462 if (scratch_chan
< 0)
463 perror_with_name (filename
);
465 scratch_pathname
= scratch_storage
.get ();
467 /* gdb_bfd_open (and its variants) prefers canonicalized
468 pathname for better BFD caching. */
469 canonical_storage
= gdb_realpath (scratch_pathname
);
470 canonical_pathname
= canonical_storage
.get ();
473 gdb_bfd_ref_ptr temp
;
474 if (write_files
&& !load_via_target
)
475 temp
= gdb_bfd_fopen (canonical_pathname
, gnutarget
,
476 FOPEN_RUB
, scratch_chan
);
478 temp
= gdb_bfd_open (canonical_pathname
, gnutarget
, scratch_chan
);
479 exec_bfd
= temp
.release ();
483 error (_("\"%ps\": could not open as an executable file: %s."),
484 styled_string (file_name_style
.style (), scratch_pathname
),
485 bfd_errmsg (bfd_get_error ()));
488 /* gdb_realpath_keepfile resolves symlinks on the local
489 filesystem and so cannot be used for "target:" files. */
490 gdb_assert (exec_filename
== NULL
);
492 exec_filename
= xstrdup (bfd_get_filename (exec_bfd
));
494 exec_filename
= gdb_realpath_keepfile (scratch_pathname
).release ();
496 if (!bfd_check_format_matches (exec_bfd
, bfd_object
, &matching
))
498 /* Make sure to close exec_bfd, or else "run" might try to use
501 error (_("\"%ps\": not in executable format: %s"),
502 styled_string (file_name_style
.style (), scratch_pathname
),
503 gdb_bfd_errmsg (bfd_get_error (), matching
).c_str ());
506 if (build_section_table (exec_bfd
, §ions
, §ions_end
))
508 /* Make sure to close exec_bfd, or else "run" might try to use
511 error (_("\"%ps\": can't find the file sections: %s"),
512 styled_string (file_name_style
.style (), scratch_pathname
),
513 bfd_errmsg (bfd_get_error ()));
516 exec_bfd_mtime
= bfd_get_mtime (exec_bfd
);
520 set_gdbarch_from_file (exec_bfd
);
522 /* Add the executable's sections to the current address spaces'
523 list of sections. This possibly pushes the exec_ops
525 add_target_sections (&exec_bfd
, sections
, sections_end
);
528 /* Tell display code (if any) about the changed file name. */
529 if (deprecated_exec_file_display_hook
)
530 (*deprecated_exec_file_display_hook
) (filename
);
533 bfd_cache_close_all ();
534 gdb::observers::executable_changed
.notify ();
537 /* Process the first arg in ARGS as the new exec file.
539 Note that we have to explicitly ignore additional args, since we can
540 be called from file_command(), which also calls symbol_file_command()
541 which can take multiple args.
543 If ARGS is NULL, we just want to close the exec file. */
546 exec_file_command (const char *args
, int from_tty
)
548 if (from_tty
&& target_has_execution
549 && !query (_("A program is being debugged already.\n"
550 "Are you sure you want to change the file? ")))
551 error (_("File not changed."));
555 /* Scan through the args and pick up the first non option arg
558 gdb_argv
built_argv (args
);
559 char **argv
= built_argv
.get ();
561 for (; (*argv
!= NULL
) && (**argv
== '-'); argv
++)
565 error (_("No executable file name was specified"));
567 gdb::unique_xmalloc_ptr
<char> filename (tilde_expand (*argv
));
568 exec_file_attach (filename
.get (), from_tty
);
571 exec_file_attach (NULL
, from_tty
);
574 /* Set both the exec file and the symbol file, in one command.
575 What a novelty. Why did GDB go through four major releases before this
576 command was added? */
579 file_command (const char *arg
, int from_tty
)
581 /* FIXME, if we lose on reading the symbol file, we should revert
582 the exec file, but that's rough. */
583 exec_file_command (arg
, from_tty
);
584 symbol_file_command (arg
, from_tty
);
585 if (deprecated_file_changed_hook
)
586 deprecated_file_changed_hook (arg
);
590 /* Locate all mappable sections of a BFD file.
591 table_pp_char is a char * to get it through bfd_map_over_sections;
592 we cast it back to its proper type. */
595 add_to_section_table (bfd
*abfd
, struct bfd_section
*asect
,
598 struct target_section
**table_pp
= (struct target_section
**) table_pp_char
;
601 gdb_assert (abfd
== asect
->owner
);
603 /* Check the section flags, but do not discard zero-length sections, since
604 some symbols may still be attached to this section. For instance, we
605 encountered on sparc-solaris 2.10 a shared library with an empty .bss
606 section to which a symbol named "_end" was attached. The address
607 of this symbol still needs to be relocated. */
608 aflag
= bfd_section_flags (asect
);
609 if (!(aflag
& SEC_ALLOC
))
612 (*table_pp
)->owner
= NULL
;
613 (*table_pp
)->the_bfd_section
= asect
;
614 (*table_pp
)->addr
= bfd_section_vma (asect
);
615 (*table_pp
)->endaddr
= (*table_pp
)->addr
+ bfd_section_size (asect
);
622 clear_section_table (struct target_section_table
*table
)
624 xfree (table
->sections
);
625 table
->sections
= table
->sections_end
= NULL
;
628 /* Resize section table TABLE by ADJUSTMENT.
629 ADJUSTMENT may be negative, in which case the caller must have already
630 removed the sections being deleted.
631 Returns the old size. */
634 resize_section_table (struct target_section_table
*table
, int adjustment
)
639 old_count
= table
->sections_end
- table
->sections
;
641 new_count
= adjustment
+ old_count
;
645 table
->sections
= XRESIZEVEC (struct target_section
, table
->sections
,
647 table
->sections_end
= table
->sections
+ new_count
;
650 clear_section_table (table
);
655 /* Builds a section table, given args BFD, SECTABLE_PTR, SECEND_PTR.
656 Returns 0 if OK, 1 on error. */
659 build_section_table (struct bfd
*some_bfd
, struct target_section
**start
,
660 struct target_section
**end
)
664 count
= bfd_count_sections (some_bfd
);
666 *start
= XNEWVEC (struct target_section
, count
);
668 bfd_map_over_sections (some_bfd
, add_to_section_table
, (char *) end
);
670 gdb_assert (*end
<= *start
+ count
);
672 /* We could realloc the table, but it probably loses for most files. */
676 /* Add the sections array defined by [SECTIONS..SECTIONS_END[ to the
677 current set of target sections. */
680 add_target_sections (void *owner
,
681 struct target_section
*sections
,
682 struct target_section
*sections_end
)
685 struct target_section_table
*table
= current_target_sections
;
687 count
= sections_end
- sections
;
691 int space
= resize_section_table (table
, count
);
694 for (i
= 0; i
< count
; ++i
)
696 table
->sections
[space
+ i
] = sections
[i
];
697 table
->sections
[space
+ i
].owner
= owner
;
700 scoped_restore_current_pspace_and_thread restore_pspace_thread
;
701 program_space
*curr_pspace
= current_program_space
;
703 /* If these are the first file sections we can provide memory
704 from, push the file_stratum target. Must do this in all
705 inferiors sharing the program space. */
706 for (inferior
*inf
: all_inferiors ())
708 if (inf
->pspace
!= curr_pspace
)
711 if (inf
->target_is_pushed (&exec_ops
))
714 switch_to_inferior_no_thread (inf
);
715 push_target (&exec_ops
);
720 /* Add the sections of OBJFILE to the current set of target sections. */
723 add_target_sections_of_objfile (struct objfile
*objfile
)
725 struct target_section_table
*table
= current_target_sections
;
726 struct obj_section
*osect
;
729 struct target_section
*ts
;
734 /* Compute the number of sections to add. */
735 ALL_OBJFILE_OSECTIONS (objfile
, osect
)
737 if (bfd_section_size (osect
->the_bfd_section
) == 0)
745 space
= resize_section_table (table
, count
);
747 ts
= table
->sections
+ space
;
749 ALL_OBJFILE_OSECTIONS (objfile
, osect
)
751 if (bfd_section_size (osect
->the_bfd_section
) == 0)
754 gdb_assert (ts
< table
->sections
+ space
+ count
);
756 ts
->addr
= obj_section_addr (osect
);
757 ts
->endaddr
= obj_section_endaddr (osect
);
758 ts
->the_bfd_section
= osect
->the_bfd_section
;
759 ts
->owner
= (void *) objfile
;
765 /* Remove all target sections owned by OWNER.
766 OWNER must be the same value passed to add_target_sections. */
769 remove_target_sections (void *owner
)
771 struct target_section
*src
, *dest
;
772 struct target_section_table
*table
= current_target_sections
;
774 gdb_assert (owner
!= NULL
);
776 dest
= table
->sections
;
777 for (src
= table
->sections
; src
< table
->sections_end
; src
++)
778 if (src
->owner
!= owner
)
780 /* Keep this section. */
786 /* If we've dropped any sections, resize the section table. */
791 old_count
= resize_section_table (table
, dest
- src
);
793 /* If we don't have any more sections to read memory from,
794 remove the file_stratum target from the stack of each
795 inferior sharing the program space. */
796 if (old_count
+ (dest
- src
) == 0)
798 scoped_restore_current_pspace_and_thread restore_pspace_thread
;
799 program_space
*curr_pspace
= current_program_space
;
801 for (inferior
*inf
: all_inferiors ())
803 if (inf
->pspace
!= curr_pspace
)
806 if (inf
->pspace
->target_sections
.sections
807 != inf
->pspace
->target_sections
.sections_end
)
810 switch_to_inferior_no_thread (inf
);
811 unpush_target (&exec_ops
);
822 if (current_program_space
->target_sections
.sections
823 != current_program_space
->target_sections
.sections_end
)
824 push_target (&exec_ops
);
829 enum target_xfer_status
830 exec_read_partial_read_only (gdb_byte
*readbuf
, ULONGEST offset
,
831 ULONGEST len
, ULONGEST
*xfered_len
)
833 /* It's unduly pedantic to refuse to look at the executable for
834 read-only pieces; so do the equivalent of readonly regions aka
836 if (exec_bfd
!= NULL
)
842 for (s
= exec_bfd
->sections
; s
; s
= s
->next
)
844 if ((s
->flags
& SEC_LOAD
) == 0
845 || (s
->flags
& SEC_READONLY
) == 0)
849 size
= bfd_section_size (s
);
850 if (vma
<= offset
&& offset
< (vma
+ size
))
854 amt
= (vma
+ size
) - offset
;
858 amt
= bfd_get_section_contents (exec_bfd
, s
,
859 readbuf
, offset
- vma
, amt
);
862 return TARGET_XFER_EOF
;
866 return TARGET_XFER_OK
;
872 /* Indicate failure to find the requested memory block. */
873 return TARGET_XFER_E_IO
;
876 /* Return all read-only memory ranges found in the target section
877 table defined by SECTIONS and SECTIONS_END, starting at (and
878 intersected with) MEMADDR for LEN bytes. */
880 static std::vector
<mem_range
>
881 section_table_available_memory (CORE_ADDR memaddr
, ULONGEST len
,
882 struct target_section
*sections
,
883 struct target_section
*sections_end
)
885 std::vector
<mem_range
> memory
;
887 for (target_section
*p
= sections
; p
< sections_end
; p
++)
889 if ((bfd_section_flags (p
->the_bfd_section
) & SEC_READONLY
) == 0)
892 /* Copy the meta-data, adjusted. */
893 if (mem_ranges_overlap (p
->addr
, p
->endaddr
- p
->addr
, memaddr
, len
))
895 ULONGEST lo1
, hi1
, lo2
, hi2
;
903 CORE_ADDR start
= std::max (lo1
, lo2
);
904 int length
= std::min (hi1
, hi2
) - start
;
906 memory
.emplace_back (start
, length
);
913 enum target_xfer_status
914 section_table_read_available_memory (gdb_byte
*readbuf
, ULONGEST offset
,
915 ULONGEST len
, ULONGEST
*xfered_len
)
917 target_section_table
*table
= target_get_section_table (&exec_ops
);
918 std::vector
<mem_range
> available_memory
919 = section_table_available_memory (offset
, len
,
920 table
->sections
, table
->sections_end
);
922 normalize_mem_ranges (&available_memory
);
924 for (const mem_range
&r
: available_memory
)
926 if (mem_ranges_overlap (r
.start
, r
.length
, offset
, len
))
929 enum target_xfer_status status
;
931 /* Get the intersection window. */
932 end
= std::min
<CORE_ADDR
> (offset
+ len
, r
.start
+ r
.length
);
934 gdb_assert (end
- offset
<= len
);
936 if (offset
>= r
.start
)
937 status
= exec_read_partial_read_only (readbuf
, offset
,
942 *xfered_len
= r
.start
- offset
;
943 status
= TARGET_XFER_UNAVAILABLE
;
950 return TARGET_XFER_UNAVAILABLE
;
953 enum target_xfer_status
954 section_table_xfer_memory_partial (gdb_byte
*readbuf
, const gdb_byte
*writebuf
,
955 ULONGEST offset
, ULONGEST len
,
956 ULONGEST
*xfered_len
,
957 struct target_section
*sections
,
958 struct target_section
*sections_end
,
959 const char *section_name
)
962 struct target_section
*p
;
963 ULONGEST memaddr
= offset
;
964 ULONGEST memend
= memaddr
+ len
;
966 gdb_assert (len
!= 0);
968 for (p
= sections
; p
< sections_end
; p
++)
970 struct bfd_section
*asect
= p
->the_bfd_section
;
971 bfd
*abfd
= asect
->owner
;
973 if (section_name
&& strcmp (section_name
, asect
->name
) != 0)
974 continue; /* not the section we need. */
975 if (memaddr
>= p
->addr
)
977 if (memend
<= p
->endaddr
)
979 /* Entire transfer is within this section. */
981 res
= bfd_set_section_contents (abfd
, asect
,
982 writebuf
, memaddr
- p
->addr
,
985 res
= bfd_get_section_contents (abfd
, asect
,
986 readbuf
, memaddr
- p
->addr
,
992 return TARGET_XFER_OK
;
995 return TARGET_XFER_EOF
;
997 else if (memaddr
>= p
->endaddr
)
999 /* This section ends before the transfer starts. */
1004 /* This section overlaps the transfer. Just do half. */
1005 len
= p
->endaddr
- memaddr
;
1007 res
= bfd_set_section_contents (abfd
, asect
,
1008 writebuf
, memaddr
- p
->addr
,
1011 res
= bfd_get_section_contents (abfd
, asect
,
1012 readbuf
, memaddr
- p
->addr
,
1017 return TARGET_XFER_OK
;
1020 return TARGET_XFER_EOF
;
1025 return TARGET_XFER_EOF
; /* We can't help. */
1028 struct target_section_table
*
1029 exec_target::get_section_table ()
1031 return current_target_sections
;
1034 enum target_xfer_status
1035 exec_target::xfer_partial (enum target_object object
,
1036 const char *annex
, gdb_byte
*readbuf
,
1037 const gdb_byte
*writebuf
,
1038 ULONGEST offset
, ULONGEST len
, ULONGEST
*xfered_len
)
1040 struct target_section_table
*table
= get_section_table ();
1042 if (object
== TARGET_OBJECT_MEMORY
)
1043 return section_table_xfer_memory_partial (readbuf
, writebuf
,
1044 offset
, len
, xfered_len
,
1046 table
->sections_end
,
1049 return TARGET_XFER_E_IO
;
1054 print_section_info (struct target_section_table
*t
, bfd
*abfd
)
1056 struct gdbarch
*gdbarch
= gdbarch_from_bfd (abfd
);
1057 struct target_section
*p
;
1058 /* FIXME: 16 is not wide enough when gdbarch_addr_bit > 64. */
1059 int wid
= gdbarch_addr_bit (gdbarch
) <= 32 ? 8 : 16;
1061 printf_filtered ("\t`%ps', ",
1062 styled_string (file_name_style
.style (),
1063 bfd_get_filename (abfd
)));
1065 printf_filtered (_("file type %s.\n"), bfd_get_target (abfd
));
1066 if (abfd
== exec_bfd
)
1068 /* gcc-3.4 does not like the initialization in
1069 <p == t->sections_end>. */
1070 bfd_vma displacement
= 0;
1071 bfd_vma entry_point
;
1073 for (p
= t
->sections
; p
< t
->sections_end
; p
++)
1075 struct bfd_section
*psect
= p
->the_bfd_section
;
1077 if ((bfd_section_flags (psect
) & (SEC_ALLOC
| SEC_LOAD
))
1078 != (SEC_ALLOC
| SEC_LOAD
))
1081 if (bfd_section_vma (psect
) <= abfd
->start_address
1082 && abfd
->start_address
< (bfd_section_vma (psect
)
1083 + bfd_section_size (psect
)))
1085 displacement
= p
->addr
- bfd_section_vma (psect
);
1089 if (p
== t
->sections_end
)
1090 warning (_("Cannot find section for the entry point of %ps."),
1091 styled_string (file_name_style
.style (),
1092 bfd_get_filename (abfd
)));
1094 entry_point
= gdbarch_addr_bits_remove (gdbarch
,
1095 bfd_get_start_address (abfd
)
1097 printf_filtered (_("\tEntry point: %s\n"),
1098 paddress (gdbarch
, entry_point
));
1100 for (p
= t
->sections
; p
< t
->sections_end
; p
++)
1102 struct bfd_section
*psect
= p
->the_bfd_section
;
1103 bfd
*pbfd
= psect
->owner
;
1105 printf_filtered ("\t%s", hex_string_custom (p
->addr
, wid
));
1106 printf_filtered (" - %s", hex_string_custom (p
->endaddr
, wid
));
1108 /* FIXME: A format of "08l" is not wide enough for file offsets
1109 larger than 4GB. OTOH, making it "016l" isn't desirable either
1110 since most output will then be much wider than necessary. It
1111 may make sense to test the size of the file and choose the
1112 format string accordingly. */
1113 /* FIXME: i18n: Need to rewrite this sentence. */
1115 printf_filtered (" @ %s",
1116 hex_string_custom (psect
->filepos
, 8));
1117 printf_filtered (" is %s", bfd_section_name (psect
));
1119 printf_filtered (" in %ps",
1120 styled_string (file_name_style
.style (),
1121 bfd_get_filename (pbfd
)));
1122 printf_filtered ("\n");
1127 exec_target::files_info ()
1130 print_section_info (current_target_sections
, exec_bfd
);
1132 puts_filtered (_("\t<no file loaded>\n"));
1136 set_section_command (const char *args
, int from_tty
)
1138 struct target_section
*p
;
1139 const char *secname
;
1141 unsigned long secaddr
;
1144 struct target_section_table
*table
;
1147 error (_("Must specify section name and its virtual address"));
1149 /* Parse out section name. */
1150 for (secname
= args
; !isspace (*args
); args
++);
1151 seclen
= args
- secname
;
1153 /* Parse out new virtual address. */
1154 secaddr
= parse_and_eval_address (args
);
1156 table
= current_target_sections
;
1157 for (p
= table
->sections
; p
< table
->sections_end
; p
++)
1159 if (!strncmp (secname
, bfd_section_name (p
->the_bfd_section
), seclen
)
1160 && bfd_section_name (p
->the_bfd_section
)[seclen
] == '\0')
1162 offset
= secaddr
- p
->addr
;
1164 p
->endaddr
+= offset
;
1166 exec_ops
.files_info ();
1170 if (seclen
>= sizeof (secprint
))
1171 seclen
= sizeof (secprint
) - 1;
1172 strncpy (secprint
, secname
, seclen
);
1173 secprint
[seclen
] = '\0';
1174 error (_("Section %s not found"), secprint
);
1177 /* If we can find a section in FILENAME with BFD index INDEX, adjust
1181 exec_set_section_address (const char *filename
, int index
, CORE_ADDR address
)
1183 struct target_section
*p
;
1184 struct target_section_table
*table
;
1186 table
= current_target_sections
;
1187 for (p
= table
->sections
; p
< table
->sections_end
; p
++)
1189 if (filename_cmp (filename
,
1190 bfd_get_filename (p
->the_bfd_section
->owner
)) == 0
1191 && index
== p
->the_bfd_section
->index
)
1193 p
->endaddr
+= address
- p
->addr
;
1200 exec_target::has_memory ()
1202 /* We can provide memory if we have any file/target sections to read
1204 return (current_target_sections
->sections
1205 != current_target_sections
->sections_end
);
1209 exec_target::make_corefile_notes (bfd
*obfd
, int *note_size
)
1211 error (_("Can't create a corefile"));
1215 exec_target::find_memory_regions (find_memory_region_ftype func
, void *data
)
1217 return objfile_find_memory_regions (this, func
, data
);
1220 void _initialize_exec ();
1224 struct cmd_list_element
*c
;
1228 c
= add_cmd ("file", class_files
, file_command
, _("\
1229 Use FILE as program to be debugged.\n\
1230 It is read for its symbols, for getting the contents of pure memory,\n\
1231 and it is the program executed when you use the `run' command.\n\
1232 If FILE cannot be found as specified, your execution directory path\n\
1233 ($PATH) is searched for a command of that name.\n\
1234 No arg means to have no executable file and no symbols."), &cmdlist
);
1235 set_cmd_completer (c
, filename_completer
);
1238 c
= add_cmd ("exec-file", class_files
, exec_file_command
, _("\
1239 Use FILE as program for getting contents of pure memory.\n\
1240 If FILE cannot be found as specified, your execution directory path\n\
1241 is searched for a command of that name.\n\
1242 No arg means have no executable file."), &cmdlist
);
1243 set_cmd_completer (c
, filename_completer
);
1245 add_com ("section", class_files
, set_section_command
, _("\
1246 Change the base address of section SECTION of the exec file to ADDR.\n\
1247 This can be used if the exec file does not contain section addresses,\n\
1248 (such as in the a.out format), or when the addresses specified in the\n\
1249 file itself are wrong. Each section must be changed separately. The\n\
1250 ``info files'' command lists all the sections and their addresses."));
1252 add_setshow_boolean_cmd ("write", class_support
, &write_files
, _("\
1253 Set writing into executable and core files."), _("\
1254 Show writing into executable and core files."), NULL
,
1257 &setlist
, &showlist
);
1259 add_setshow_enum_cmd ("exec-file-mismatch", class_support
,
1260 exec_file_mismatch_names
,
1261 &exec_file_mismatch
,
1263 Set exec-file-mismatch handling (ask|warn|off)."),
1265 Show exec-file-mismatch handling (ask|warn|off)."),
1267 Specifies how to handle a mismatch between the current exec-file\n\
1268 loaded by GDB and the exec-file automatically determined when attaching\n\
1270 ask - warn the user and ask whether to load the determined exec-file.\n\
1271 warn - warn the user, but do not change the exec-file.\n\
1272 off - do not check for mismatch."),
1273 set_exec_file_mismatch_command
,
1274 show_exec_file_mismatch_command
,
1275 &setlist
, &showlist
);
1277 add_target (exec_target_info
, exec_target_open
, filename_completer
);