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"
42 #include "readline/tilde.h"
49 #include "gdbsupport/pathstuff.h"
50 #include "cli/cli-style.h"
52 void (*deprecated_file_changed_hook
) (const char *);
54 static const target_info exec_target_info
= {
56 N_("Local exec file"),
57 N_("Use an executable file as a target.\n\
58 Specify the filename of the executable file.")
61 /* The target vector for executable files. */
63 struct exec_target final
: public target_ops
65 const target_info
&info () const override
66 { return exec_target_info
; }
68 strata
stratum () const override
{ return file_stratum
; }
70 void close () override
;
71 enum target_xfer_status
xfer_partial (enum target_object object
,
74 const gdb_byte
*writebuf
,
75 ULONGEST offset
, ULONGEST len
,
76 ULONGEST
*xfered_len
) override
;
77 struct target_section_table
*get_section_table () override
;
78 void files_info () override
;
80 bool has_memory () override
;
81 char *make_corefile_notes (bfd
*, int *) override
;
82 int find_memory_regions (find_memory_region_ftype func
, void *data
) override
;
85 static exec_target exec_ops
;
87 /* How to handle a mismatch between the current exec file and the exec
88 file determined from target. */
90 static const char *const exec_file_mismatch_names
[]
91 = {"ask", "warn", "off", NULL
};
92 enum exec_file_mismatch_mode
94 exec_file_mismatch_ask
, exec_file_mismatch_warn
, exec_file_mismatch_off
96 static const char *exec_file_mismatch
= exec_file_mismatch_names
[0];
97 static enum exec_file_mismatch_mode exec_file_mismatch_mode
98 = exec_file_mismatch_ask
;
102 show_exec_file_mismatch_command (struct ui_file
*file
, int from_tty
,
103 struct cmd_list_element
*c
, const char *value
)
105 fprintf_filtered (gdb_stdout
,
106 _("exec-file-mismatch handling is currently \"%s\".\n"),
107 exec_file_mismatch_names
[exec_file_mismatch_mode
]);
110 /* Set command. Change the setting for range checking. */
112 set_exec_file_mismatch_command (const char *ignore
,
113 int from_tty
, struct cmd_list_element
*c
)
115 for (enum exec_file_mismatch_mode mode
= exec_file_mismatch_ask
;
117 mode
= static_cast<enum exec_file_mismatch_mode
>(1 + (int) mode
))
119 if (strcmp (exec_file_mismatch
, exec_file_mismatch_names
[mode
]) == 0)
121 exec_file_mismatch_mode
= mode
;
124 if (mode
== exec_file_mismatch_off
)
125 internal_error (__FILE__
, __LINE__
,
126 _("Unrecognized exec-file-mismatch setting: \"%s\""),
131 /* Whether to open exec and core files read-only or read-write. */
133 bool write_files
= false;
135 show_write_files (struct ui_file
*file
, int from_tty
,
136 struct cmd_list_element
*c
, const char *value
)
138 fprintf_filtered (file
, _("Writing into executable and core files is %s.\n"),
144 exec_target_open (const char *args
, int from_tty
)
146 target_preopen (from_tty
);
147 exec_file_attach (args
, from_tty
);
150 /* Close and clear exec_bfd. If we end up with no target sections to
151 read memory from, this unpushes the exec_ops target. */
158 bfd
*abfd
= exec_bfd
;
160 gdb_bfd_unref (abfd
);
162 /* Removing target sections may close the exec_ops target.
163 Clear exec_bfd before doing so to prevent recursion. */
167 remove_target_sections (&exec_bfd
);
169 xfree (exec_filename
);
170 exec_filename
= NULL
;
174 /* This is the target_close implementation. Clears all target
175 sections and closes all executable bfds from all program spaces. */
178 exec_target::close ()
180 struct program_space
*ss
;
181 scoped_restore_current_program_space restore_pspace
;
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
);
252 /* If wee cannot validate the exec file, return. */
253 if (current_exec_file
== NULL
|| pid_exec_file
== NULL
)
256 std::string
exec_file_target (pid_exec_file
);
258 /* In case the exec file is not local, exec_file_target has to point at
259 the target file system. */
260 if (is_target_filename (current_exec_file
) && !target_filesystem_is_local ())
261 exec_file_target
= TARGET_SYSROOT_PREFIX
+ exec_file_target
;
263 if (exec_file_target
!= current_exec_file
)
266 (_("Mismatch between current exec-file %ps\n"
267 "and automatically determined exec-file %ps\n"
268 "exec-file-mismatch handling is currently \"%s\""),
269 styled_string (file_name_style
.style (), current_exec_file
),
270 styled_string (file_name_style
.style (), exec_file_target
.c_str ()),
271 exec_file_mismatch_names
[exec_file_mismatch_mode
]);
272 if (exec_file_mismatch_mode
== exec_file_mismatch_ask
)
274 symfile_add_flags add_flags
= SYMFILE_MAINLINE
;
276 add_flags
|= SYMFILE_VERBOSE
;
279 symbol_file_add_main (exec_file_target
.c_str (), add_flags
);
280 exec_file_attach (exec_file_target
.c_str (), from_tty
);
282 catch (gdb_exception_error
&err
)
284 warning (_("loading %ps %s"),
285 styled_string (file_name_style
.style (),
286 exec_file_target
.c_str ()),
287 err
.message
!= NULL
? err
.what () : "error");
296 exec_file_locate_attach (int pid
, int defer_bp_reset
, int from_tty
)
298 char *exec_file_target
;
299 symfile_add_flags add_flags
= 0;
301 /* Do nothing if we already have an executable filename. */
302 if (get_exec_file (0) != NULL
)
305 /* Try to determine a filename from the process itself. */
306 exec_file_target
= target_pid_to_exec_file (pid
);
307 if (exec_file_target
== NULL
)
309 warning (_("No executable has been specified and target does not "
311 "determining executable automatically. "
312 "Try using the \"file\" command."));
316 gdb::unique_xmalloc_ptr
<char> exec_file_host
317 = exec_file_find (exec_file_target
, NULL
);
320 add_flags
|= SYMFILE_DEFER_BP_RESET
;
323 add_flags
|= SYMFILE_VERBOSE
;
325 /* Attempt to open the exec file. */
326 try_open_exec_file (exec_file_host
.get (), current_inferior (), add_flags
);
329 /* Set FILENAME as the new exec file.
331 This function is intended to be behave essentially the same
332 as exec_file_command, except that the latter will detect when
333 a target is being debugged, and will ask the user whether it
334 should be shut down first. (If the answer is "no", then the
335 new file is ignored.)
337 This file is used by exec_file_command, to do the work of opening
338 and processing the exec file after any prompting has happened.
340 And, it is used by child_attach, when the attach command was
341 given a pid but not a exec pathname, and the attach command could
342 figure out the pathname from the pid. (In this case, we shouldn't
343 ask the user whether the current target should be shut down --
344 we're supplying the exec pathname late for good reason.) */
347 exec_file_attach (const char *filename
, int from_tty
)
349 /* First, acquire a reference to the current exec_bfd. We release
350 this at the end of the function; but acquiring it now lets the
351 BFD cache return it if this call refers to the same file. */
352 gdb_bfd_ref_ptr exec_bfd_holder
= gdb_bfd_ref_ptr::new_reference (exec_bfd
);
354 /* Remove any previous exec file. */
357 /* Now open and digest the file the user requested, if any. */
362 printf_unfiltered (_("No executable file now.\n"));
364 set_gdbarch_from_file (NULL
);
368 int load_via_target
= 0;
369 const char *scratch_pathname
, *canonical_pathname
;
371 struct target_section
*sections
= NULL
, *sections_end
= NULL
;
374 if (is_target_filename (filename
))
376 if (target_filesystem_is_local ())
377 filename
+= strlen (TARGET_SYSROOT_PREFIX
);
382 gdb::unique_xmalloc_ptr
<char> canonical_storage
, scratch_storage
;
385 /* gdb_bfd_fopen does not support "target:" filenames. */
387 warning (_("writing into executable files is "
388 "not supported for %s sysroots"),
389 TARGET_SYSROOT_PREFIX
);
391 scratch_pathname
= filename
;
393 canonical_pathname
= scratch_pathname
;
397 scratch_chan
= openp (getenv ("PATH"), OPF_TRY_CWD_FIRST
,
398 filename
, write_files
?
399 O_RDWR
| O_BINARY
: O_RDONLY
| O_BINARY
,
401 #if defined(__GO32__) || defined(_WIN32) || defined(__CYGWIN__)
402 if (scratch_chan
< 0)
404 char *exename
= (char *) alloca (strlen (filename
) + 5);
406 strcat (strcpy (exename
, filename
), ".exe");
407 scratch_chan
= openp (getenv ("PATH"), OPF_TRY_CWD_FIRST
,
408 exename
, write_files
?
410 : O_RDONLY
| O_BINARY
,
414 if (scratch_chan
< 0)
415 perror_with_name (filename
);
417 scratch_pathname
= scratch_storage
.get ();
419 /* gdb_bfd_open (and its variants) prefers canonicalized
420 pathname for better BFD caching. */
421 canonical_storage
= gdb_realpath (scratch_pathname
);
422 canonical_pathname
= canonical_storage
.get ();
425 gdb_bfd_ref_ptr temp
;
426 if (write_files
&& !load_via_target
)
427 temp
= gdb_bfd_fopen (canonical_pathname
, gnutarget
,
428 FOPEN_RUB
, scratch_chan
);
430 temp
= gdb_bfd_open (canonical_pathname
, gnutarget
, scratch_chan
);
431 exec_bfd
= temp
.release ();
435 error (_("\"%ps\": could not open as an executable file: %s."),
436 styled_string (file_name_style
.style (), scratch_pathname
),
437 bfd_errmsg (bfd_get_error ()));
440 /* gdb_realpath_keepfile resolves symlinks on the local
441 filesystem and so cannot be used for "target:" files. */
442 gdb_assert (exec_filename
== NULL
);
444 exec_filename
= xstrdup (bfd_get_filename (exec_bfd
));
446 exec_filename
= gdb_realpath_keepfile (scratch_pathname
).release ();
448 if (!bfd_check_format_matches (exec_bfd
, bfd_object
, &matching
))
450 /* Make sure to close exec_bfd, or else "run" might try to use
453 error (_("\"%ps\": not in executable format: %s"),
454 styled_string (file_name_style
.style (), scratch_pathname
),
455 gdb_bfd_errmsg (bfd_get_error (), matching
).c_str ());
458 if (build_section_table (exec_bfd
, §ions
, §ions_end
))
460 /* Make sure to close exec_bfd, or else "run" might try to use
463 error (_("\"%ps\": can't find the file sections: %s"),
464 styled_string (file_name_style
.style (), scratch_pathname
),
465 bfd_errmsg (bfd_get_error ()));
468 exec_bfd_mtime
= bfd_get_mtime (exec_bfd
);
472 set_gdbarch_from_file (exec_bfd
);
474 /* Add the executable's sections to the current address spaces'
475 list of sections. This possibly pushes the exec_ops
477 add_target_sections (&exec_bfd
, sections
, sections_end
);
480 /* Tell display code (if any) about the changed file name. */
481 if (deprecated_exec_file_display_hook
)
482 (*deprecated_exec_file_display_hook
) (filename
);
485 bfd_cache_close_all ();
486 gdb::observers::executable_changed
.notify ();
489 /* Process the first arg in ARGS as the new exec file.
491 Note that we have to explicitly ignore additional args, since we can
492 be called from file_command(), which also calls symbol_file_command()
493 which can take multiple args.
495 If ARGS is NULL, we just want to close the exec file. */
498 exec_file_command (const char *args
, int from_tty
)
500 if (from_tty
&& target_has_execution
501 && !query (_("A program is being debugged already.\n"
502 "Are you sure you want to change the file? ")))
503 error (_("File not changed."));
507 /* Scan through the args and pick up the first non option arg
510 gdb_argv
built_argv (args
);
511 char **argv
= built_argv
.get ();
513 for (; (*argv
!= NULL
) && (**argv
== '-'); argv
++)
517 error (_("No executable file name was specified"));
519 gdb::unique_xmalloc_ptr
<char> filename (tilde_expand (*argv
));
520 exec_file_attach (filename
.get (), from_tty
);
523 exec_file_attach (NULL
, from_tty
);
526 /* Set both the exec file and the symbol file, in one command.
527 What a novelty. Why did GDB go through four major releases before this
528 command was added? */
531 file_command (const char *arg
, int from_tty
)
533 /* FIXME, if we lose on reading the symbol file, we should revert
534 the exec file, but that's rough. */
535 exec_file_command (arg
, from_tty
);
536 symbol_file_command (arg
, from_tty
);
537 if (deprecated_file_changed_hook
)
538 deprecated_file_changed_hook (arg
);
542 /* Locate all mappable sections of a BFD file.
543 table_pp_char is a char * to get it through bfd_map_over_sections;
544 we cast it back to its proper type. */
547 add_to_section_table (bfd
*abfd
, struct bfd_section
*asect
,
550 struct target_section
**table_pp
= (struct target_section
**) table_pp_char
;
553 gdb_assert (abfd
== asect
->owner
);
555 /* Check the section flags, but do not discard zero-length sections, since
556 some symbols may still be attached to this section. For instance, we
557 encountered on sparc-solaris 2.10 a shared library with an empty .bss
558 section to which a symbol named "_end" was attached. The address
559 of this symbol still needs to be relocated. */
560 aflag
= bfd_section_flags (asect
);
561 if (!(aflag
& SEC_ALLOC
))
564 (*table_pp
)->owner
= NULL
;
565 (*table_pp
)->the_bfd_section
= asect
;
566 (*table_pp
)->addr
= bfd_section_vma (asect
);
567 (*table_pp
)->endaddr
= (*table_pp
)->addr
+ bfd_section_size (asect
);
574 clear_section_table (struct target_section_table
*table
)
576 xfree (table
->sections
);
577 table
->sections
= table
->sections_end
= NULL
;
580 /* Resize section table TABLE by ADJUSTMENT.
581 ADJUSTMENT may be negative, in which case the caller must have already
582 removed the sections being deleted.
583 Returns the old size. */
586 resize_section_table (struct target_section_table
*table
, int adjustment
)
591 old_count
= table
->sections_end
- table
->sections
;
593 new_count
= adjustment
+ old_count
;
597 table
->sections
= XRESIZEVEC (struct target_section
, table
->sections
,
599 table
->sections_end
= table
->sections
+ new_count
;
602 clear_section_table (table
);
607 /* Builds a section table, given args BFD, SECTABLE_PTR, SECEND_PTR.
608 Returns 0 if OK, 1 on error. */
611 build_section_table (struct bfd
*some_bfd
, struct target_section
**start
,
612 struct target_section
**end
)
616 count
= bfd_count_sections (some_bfd
);
619 *start
= XNEWVEC (struct target_section
, count
);
621 bfd_map_over_sections (some_bfd
, add_to_section_table
, (char *) end
);
622 if (*end
> *start
+ count
)
623 internal_error (__FILE__
, __LINE__
,
624 _("failed internal consistency check"));
625 /* We could realloc the table, but it probably loses for most files. */
629 /* Add the sections array defined by [SECTIONS..SECTIONS_END[ to the
630 current set of target sections. */
633 add_target_sections (void *owner
,
634 struct target_section
*sections
,
635 struct target_section
*sections_end
)
638 struct target_section_table
*table
= current_target_sections
;
640 count
= sections_end
- sections
;
644 int space
= resize_section_table (table
, count
);
647 for (i
= 0; i
< count
; ++i
)
649 table
->sections
[space
+ i
] = sections
[i
];
650 table
->sections
[space
+ i
].owner
= owner
;
653 scoped_restore_current_pspace_and_thread restore_pspace_thread
;
654 program_space
*curr_pspace
= current_program_space
;
656 /* If these are the first file sections we can provide memory
657 from, push the file_stratum target. Must do this in all
658 inferiors sharing the program space. */
659 for (inferior
*inf
: all_inferiors ())
661 if (inf
->pspace
!= curr_pspace
)
664 if (inf
->target_is_pushed (&exec_ops
))
667 switch_to_inferior_no_thread (inf
);
668 push_target (&exec_ops
);
673 /* Add the sections of OBJFILE to the current set of target sections. */
676 add_target_sections_of_objfile (struct objfile
*objfile
)
678 struct target_section_table
*table
= current_target_sections
;
679 struct obj_section
*osect
;
682 struct target_section
*ts
;
687 /* Compute the number of sections to add. */
688 ALL_OBJFILE_OSECTIONS (objfile
, osect
)
690 if (bfd_section_size (osect
->the_bfd_section
) == 0)
698 space
= resize_section_table (table
, count
);
700 ts
= table
->sections
+ space
;
702 ALL_OBJFILE_OSECTIONS (objfile
, osect
)
704 if (bfd_section_size (osect
->the_bfd_section
) == 0)
707 gdb_assert (ts
< table
->sections
+ space
+ count
);
709 ts
->addr
= obj_section_addr (osect
);
710 ts
->endaddr
= obj_section_endaddr (osect
);
711 ts
->the_bfd_section
= osect
->the_bfd_section
;
712 ts
->owner
= (void *) objfile
;
718 /* Remove all target sections owned by OWNER.
719 OWNER must be the same value passed to add_target_sections. */
722 remove_target_sections (void *owner
)
724 struct target_section
*src
, *dest
;
725 struct target_section_table
*table
= current_target_sections
;
727 gdb_assert (owner
!= NULL
);
729 dest
= table
->sections
;
730 for (src
= table
->sections
; src
< table
->sections_end
; src
++)
731 if (src
->owner
!= owner
)
733 /* Keep this section. */
739 /* If we've dropped any sections, resize the section table. */
744 old_count
= resize_section_table (table
, dest
- src
);
746 /* If we don't have any more sections to read memory from,
747 remove the file_stratum target from the stack of each
748 inferior sharing the program space. */
749 if (old_count
+ (dest
- src
) == 0)
751 scoped_restore_current_pspace_and_thread restore_pspace_thread
;
752 program_space
*curr_pspace
= current_program_space
;
754 for (inferior
*inf
: all_inferiors ())
756 if (inf
->pspace
!= curr_pspace
)
759 if (inf
->pspace
->target_sections
.sections
760 != inf
->pspace
->target_sections
.sections_end
)
763 switch_to_inferior_no_thread (inf
);
764 unpush_target (&exec_ops
);
775 if (current_program_space
->target_sections
.sections
776 != current_program_space
->target_sections
.sections_end
)
777 push_target (&exec_ops
);
782 enum target_xfer_status
783 exec_read_partial_read_only (gdb_byte
*readbuf
, ULONGEST offset
,
784 ULONGEST len
, ULONGEST
*xfered_len
)
786 /* It's unduly pedantic to refuse to look at the executable for
787 read-only pieces; so do the equivalent of readonly regions aka
789 if (exec_bfd
!= NULL
)
795 for (s
= exec_bfd
->sections
; s
; s
= s
->next
)
797 if ((s
->flags
& SEC_LOAD
) == 0
798 || (s
->flags
& SEC_READONLY
) == 0)
802 size
= bfd_section_size (s
);
803 if (vma
<= offset
&& offset
< (vma
+ size
))
807 amt
= (vma
+ size
) - offset
;
811 amt
= bfd_get_section_contents (exec_bfd
, s
,
812 readbuf
, offset
- vma
, amt
);
815 return TARGET_XFER_EOF
;
819 return TARGET_XFER_OK
;
825 /* Indicate failure to find the requested memory block. */
826 return TARGET_XFER_E_IO
;
829 /* Return all read-only memory ranges found in the target section
830 table defined by SECTIONS and SECTIONS_END, starting at (and
831 intersected with) MEMADDR for LEN bytes. */
833 static std::vector
<mem_range
>
834 section_table_available_memory (CORE_ADDR memaddr
, ULONGEST len
,
835 struct target_section
*sections
,
836 struct target_section
*sections_end
)
838 std::vector
<mem_range
> memory
;
840 for (target_section
*p
= sections
; p
< sections_end
; p
++)
842 if ((bfd_section_flags (p
->the_bfd_section
) & SEC_READONLY
) == 0)
845 /* Copy the meta-data, adjusted. */
846 if (mem_ranges_overlap (p
->addr
, p
->endaddr
- p
->addr
, memaddr
, len
))
848 ULONGEST lo1
, hi1
, lo2
, hi2
;
856 CORE_ADDR start
= std::max (lo1
, lo2
);
857 int length
= std::min (hi1
, hi2
) - start
;
859 memory
.emplace_back (start
, length
);
866 enum target_xfer_status
867 section_table_read_available_memory (gdb_byte
*readbuf
, ULONGEST offset
,
868 ULONGEST len
, ULONGEST
*xfered_len
)
870 target_section_table
*table
= target_get_section_table (&exec_ops
);
871 std::vector
<mem_range
> available_memory
872 = section_table_available_memory (offset
, len
,
873 table
->sections
, table
->sections_end
);
875 normalize_mem_ranges (&available_memory
);
877 for (const mem_range
&r
: available_memory
)
879 if (mem_ranges_overlap (r
.start
, r
.length
, offset
, len
))
882 enum target_xfer_status status
;
884 /* Get the intersection window. */
885 end
= std::min
<CORE_ADDR
> (offset
+ len
, r
.start
+ r
.length
);
887 gdb_assert (end
- offset
<= len
);
889 if (offset
>= r
.start
)
890 status
= exec_read_partial_read_only (readbuf
, offset
,
895 *xfered_len
= r
.start
- offset
;
896 status
= TARGET_XFER_UNAVAILABLE
;
903 return TARGET_XFER_UNAVAILABLE
;
906 enum target_xfer_status
907 section_table_xfer_memory_partial (gdb_byte
*readbuf
, const gdb_byte
*writebuf
,
908 ULONGEST offset
, ULONGEST len
,
909 ULONGEST
*xfered_len
,
910 struct target_section
*sections
,
911 struct target_section
*sections_end
,
912 const char *section_name
)
915 struct target_section
*p
;
916 ULONGEST memaddr
= offset
;
917 ULONGEST memend
= memaddr
+ len
;
920 internal_error (__FILE__
, __LINE__
,
921 _("failed internal consistency check"));
923 for (p
= sections
; p
< sections_end
; p
++)
925 struct bfd_section
*asect
= p
->the_bfd_section
;
926 bfd
*abfd
= asect
->owner
;
928 if (section_name
&& strcmp (section_name
, asect
->name
) != 0)
929 continue; /* not the section we need. */
930 if (memaddr
>= p
->addr
)
932 if (memend
<= p
->endaddr
)
934 /* Entire transfer is within this section. */
936 res
= bfd_set_section_contents (abfd
, asect
,
937 writebuf
, memaddr
- p
->addr
,
940 res
= bfd_get_section_contents (abfd
, asect
,
941 readbuf
, memaddr
- p
->addr
,
947 return TARGET_XFER_OK
;
950 return TARGET_XFER_EOF
;
952 else if (memaddr
>= p
->endaddr
)
954 /* This section ends before the transfer starts. */
959 /* This section overlaps the transfer. Just do half. */
960 len
= p
->endaddr
- memaddr
;
962 res
= bfd_set_section_contents (abfd
, asect
,
963 writebuf
, memaddr
- p
->addr
,
966 res
= bfd_get_section_contents (abfd
, asect
,
967 readbuf
, memaddr
- p
->addr
,
972 return TARGET_XFER_OK
;
975 return TARGET_XFER_EOF
;
980 return TARGET_XFER_EOF
; /* We can't help. */
983 struct target_section_table
*
984 exec_target::get_section_table ()
986 return current_target_sections
;
989 enum target_xfer_status
990 exec_target::xfer_partial (enum target_object object
,
991 const char *annex
, gdb_byte
*readbuf
,
992 const gdb_byte
*writebuf
,
993 ULONGEST offset
, ULONGEST len
, ULONGEST
*xfered_len
)
995 struct target_section_table
*table
= get_section_table ();
997 if (object
== TARGET_OBJECT_MEMORY
)
998 return section_table_xfer_memory_partial (readbuf
, writebuf
,
999 offset
, len
, xfered_len
,
1001 table
->sections_end
,
1004 return TARGET_XFER_E_IO
;
1009 print_section_info (struct target_section_table
*t
, bfd
*abfd
)
1011 struct gdbarch
*gdbarch
= gdbarch_from_bfd (abfd
);
1012 struct target_section
*p
;
1013 /* FIXME: 16 is not wide enough when gdbarch_addr_bit > 64. */
1014 int wid
= gdbarch_addr_bit (gdbarch
) <= 32 ? 8 : 16;
1016 printf_filtered ("\t`%ps', ",
1017 styled_string (file_name_style
.style (),
1018 bfd_get_filename (abfd
)));
1020 printf_filtered (_("file type %s.\n"), bfd_get_target (abfd
));
1021 if (abfd
== exec_bfd
)
1023 /* gcc-3.4 does not like the initialization in
1024 <p == t->sections_end>. */
1025 bfd_vma displacement
= 0;
1026 bfd_vma entry_point
;
1028 for (p
= t
->sections
; p
< t
->sections_end
; p
++)
1030 struct bfd_section
*psect
= p
->the_bfd_section
;
1032 if ((bfd_section_flags (psect
) & (SEC_ALLOC
| SEC_LOAD
))
1033 != (SEC_ALLOC
| SEC_LOAD
))
1036 if (bfd_section_vma (psect
) <= abfd
->start_address
1037 && abfd
->start_address
< (bfd_section_vma (psect
)
1038 + bfd_section_size (psect
)))
1040 displacement
= p
->addr
- bfd_section_vma (psect
);
1044 if (p
== t
->sections_end
)
1045 warning (_("Cannot find section for the entry point of %ps."),
1046 styled_string (file_name_style
.style (),
1047 bfd_get_filename (abfd
)));
1049 entry_point
= gdbarch_addr_bits_remove (gdbarch
,
1050 bfd_get_start_address (abfd
)
1052 printf_filtered (_("\tEntry point: %s\n"),
1053 paddress (gdbarch
, entry_point
));
1055 for (p
= t
->sections
; p
< t
->sections_end
; p
++)
1057 struct bfd_section
*psect
= p
->the_bfd_section
;
1058 bfd
*pbfd
= psect
->owner
;
1060 printf_filtered ("\t%s", hex_string_custom (p
->addr
, wid
));
1061 printf_filtered (" - %s", hex_string_custom (p
->endaddr
, wid
));
1063 /* FIXME: A format of "08l" is not wide enough for file offsets
1064 larger than 4GB. OTOH, making it "016l" isn't desirable either
1065 since most output will then be much wider than necessary. It
1066 may make sense to test the size of the file and choose the
1067 format string accordingly. */
1068 /* FIXME: i18n: Need to rewrite this sentence. */
1070 printf_filtered (" @ %s",
1071 hex_string_custom (psect
->filepos
, 8));
1072 printf_filtered (" is %s", bfd_section_name (psect
));
1074 printf_filtered (" in %ps",
1075 styled_string (file_name_style
.style (),
1076 bfd_get_filename (pbfd
)));
1077 printf_filtered ("\n");
1082 exec_target::files_info ()
1085 print_section_info (current_target_sections
, exec_bfd
);
1087 puts_filtered (_("\t<no file loaded>\n"));
1091 set_section_command (const char *args
, int from_tty
)
1093 struct target_section
*p
;
1094 const char *secname
;
1096 unsigned long secaddr
;
1099 struct target_section_table
*table
;
1102 error (_("Must specify section name and its virtual address"));
1104 /* Parse out section name. */
1105 for (secname
= args
; !isspace (*args
); args
++);
1106 seclen
= args
- secname
;
1108 /* Parse out new virtual address. */
1109 secaddr
= parse_and_eval_address (args
);
1111 table
= current_target_sections
;
1112 for (p
= table
->sections
; p
< table
->sections_end
; p
++)
1114 if (!strncmp (secname
, bfd_section_name (p
->the_bfd_section
), seclen
)
1115 && bfd_section_name (p
->the_bfd_section
)[seclen
] == '\0')
1117 offset
= secaddr
- p
->addr
;
1119 p
->endaddr
+= offset
;
1121 exec_ops
.files_info ();
1125 if (seclen
>= sizeof (secprint
))
1126 seclen
= sizeof (secprint
) - 1;
1127 strncpy (secprint
, secname
, seclen
);
1128 secprint
[seclen
] = '\0';
1129 error (_("Section %s not found"), secprint
);
1132 /* If we can find a section in FILENAME with BFD index INDEX, adjust
1136 exec_set_section_address (const char *filename
, int index
, CORE_ADDR address
)
1138 struct target_section
*p
;
1139 struct target_section_table
*table
;
1141 table
= current_target_sections
;
1142 for (p
= table
->sections
; p
< table
->sections_end
; p
++)
1144 if (filename_cmp (filename
, p
->the_bfd_section
->owner
->filename
) == 0
1145 && index
== p
->the_bfd_section
->index
)
1147 p
->endaddr
+= address
- p
->addr
;
1154 exec_target::has_memory ()
1156 /* We can provide memory if we have any file/target sections to read
1158 return (current_target_sections
->sections
1159 != current_target_sections
->sections_end
);
1163 exec_target::make_corefile_notes (bfd
*obfd
, int *note_size
)
1165 error (_("Can't create a corefile"));
1169 exec_target::find_memory_regions (find_memory_region_ftype func
, void *data
)
1171 return objfile_find_memory_regions (this, func
, data
);
1174 void _initialize_exec ();
1178 struct cmd_list_element
*c
;
1182 c
= add_cmd ("file", class_files
, file_command
, _("\
1183 Use FILE as program to be debugged.\n\
1184 It is read for its symbols, for getting the contents of pure memory,\n\
1185 and it is the program executed when you use the `run' command.\n\
1186 If FILE cannot be found as specified, your execution directory path\n\
1187 ($PATH) is searched for a command of that name.\n\
1188 No arg means to have no executable file and no symbols."), &cmdlist
);
1189 set_cmd_completer (c
, filename_completer
);
1192 c
= add_cmd ("exec-file", class_files
, exec_file_command
, _("\
1193 Use FILE as program for getting contents of pure memory.\n\
1194 If FILE cannot be found as specified, your execution directory path\n\
1195 is searched for a command of that name.\n\
1196 No arg means have no executable file."), &cmdlist
);
1197 set_cmd_completer (c
, filename_completer
);
1199 add_com ("section", class_files
, set_section_command
, _("\
1200 Change the base address of section SECTION of the exec file to ADDR.\n\
1201 This can be used if the exec file does not contain section addresses,\n\
1202 (such as in the a.out format), or when the addresses specified in the\n\
1203 file itself are wrong. Each section must be changed separately. The\n\
1204 ``info files'' command lists all the sections and their addresses."));
1206 add_setshow_boolean_cmd ("write", class_support
, &write_files
, _("\
1207 Set writing into executable and core files."), _("\
1208 Show writing into executable and core files."), NULL
,
1211 &setlist
, &showlist
);
1213 add_setshow_enum_cmd ("exec-file-mismatch", class_support
,
1214 exec_file_mismatch_names
,
1215 &exec_file_mismatch
,
1217 Set exec-file-mismatch handling (ask|warn|off)."),
1219 Show exec-file-mismatch handling (ask|warn|off)."),
1221 Specifies how to handle a mismatch between the current exec-file name\n\
1222 loaded by GDB and the exec-file name automatically determined when attaching\n\
1224 ask - warn the user and ask whether to load the determined exec-file.\n\
1225 warn - warn the user, but do not change the exec-file.\n\
1226 off - do not check for mismatch."),
1227 set_exec_file_mismatch_command
,
1228 show_exec_file_mismatch_command
,
1229 &setlist
, &showlist
);
1231 add_target (exec_target_info
, exec_target_open
, filename_completer
);