1 /* Work with executable files, for GDB.
3 Copyright (C) 1988-2021 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 const target_section_table
*get_section_table () override
;
79 void files_info () override
;
81 bool has_memory () override
;
82 gdb::unique_xmalloc_ptr
<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 /* This is the target_close implementation. Clears all target
152 sections and closes all executable bfds from all program spaces. */
155 exec_target::close ()
157 for (struct program_space
*ss
: program_spaces
)
159 ss
->clear_target_sections ();
167 try_open_exec_file (const char *exec_file_host
, struct inferior
*inf
,
168 symfile_add_flags add_flags
)
170 struct gdb_exception prev_err
;
172 /* exec_file_attach and symbol_file_add_main may throw an error if the file
173 cannot be opened either locally or remotely.
175 This happens for example, when the file is first found in the local
176 sysroot (above), and then disappears (a TOCTOU race), or when it doesn't
177 exist in the target filesystem, or when the file does exist, but
180 Even without a symbol file, the remote-based debugging session should
181 continue normally instead of ending abruptly. Hence we catch thrown
182 errors/exceptions in the following code. */
185 /* We must do this step even if exec_file_host is NULL, so that
186 exec_file_attach will clear state. */
187 exec_file_attach (exec_file_host
, add_flags
& SYMFILE_VERBOSE
);
189 catch (gdb_exception_error
&err
)
191 if (err
.message
!= NULL
)
192 warning ("%s", err
.what ());
194 prev_err
= std::move (err
);
197 if (exec_file_host
!= NULL
)
201 symbol_file_add_main (exec_file_host
, add_flags
);
203 catch (const gdb_exception_error
&err
)
205 if (!exception_print_same (prev_err
, err
))
206 warning ("%s", err
.what ());
214 validate_exec_file (int from_tty
)
216 /* If user asked to ignore the mismatch, do nothing. */
217 if (exec_file_mismatch_mode
== exec_file_mismatch_off
)
220 const char *current_exec_file
= get_exec_file (0);
221 struct inferior
*inf
= current_inferior ();
222 /* Try to determine a filename from the process itself. */
223 const char *pid_exec_file
= target_pid_to_exec_file (inf
->pid
);
224 bool build_id_mismatch
= false;
226 /* If we cannot validate the exec file, return. */
227 if (current_exec_file
== NULL
|| pid_exec_file
== NULL
)
230 /* Try validating via build-id, if available. This is the most
233 /* In case current_exec_file was changed, reopen_exec_file ensures
234 an up to date build_id (will do nothing if the file timestamp
235 did not change). If exec file changed, reopen_exec_file has
236 allocated another file name, so get_exec_file again. */
238 current_exec_file
= get_exec_file (0);
240 const bfd_build_id
*exec_file_build_id
241 = build_id_bfd_get (current_program_space
->exec_bfd ());
242 if (exec_file_build_id
!= nullptr)
244 /* Prepend the target prefix, to force gdb_bfd_open to open the
245 file on the remote file system (if indeed remote). */
246 std::string target_pid_exec_file
247 = std::string (TARGET_SYSROOT_PREFIX
) + pid_exec_file
;
249 gdb_bfd_ref_ptr
abfd (gdb_bfd_open (target_pid_exec_file
.c_str (),
250 gnutarget
, -1, false));
253 const bfd_build_id
*target_exec_file_build_id
254 = build_id_bfd_get (abfd
.get ());
256 if (target_exec_file_build_id
!= nullptr)
258 if (exec_file_build_id
->size
== target_exec_file_build_id
->size
259 && memcmp (exec_file_build_id
->data
,
260 target_exec_file_build_id
->data
,
261 exec_file_build_id
->size
) == 0)
267 build_id_mismatch
= true;
272 if (build_id_mismatch
)
274 std::string
exec_file_target (pid_exec_file
);
276 /* In case the exec file is not local, exec_file_target has to point at
277 the target file system. */
278 if (is_target_filename (current_exec_file
) && !target_filesystem_is_local ())
279 exec_file_target
= TARGET_SYSROOT_PREFIX
+ exec_file_target
;
282 (_("Build ID mismatch between current exec-file %ps\n"
283 "and automatically determined exec-file %ps\n"
284 "exec-file-mismatch handling is currently \"%s\""),
285 styled_string (file_name_style
.style (), current_exec_file
),
286 styled_string (file_name_style
.style (), exec_file_target
.c_str ()),
287 exec_file_mismatch_names
[exec_file_mismatch_mode
]);
288 if (exec_file_mismatch_mode
== exec_file_mismatch_ask
)
290 symfile_add_flags add_flags
= SYMFILE_MAINLINE
;
293 add_flags
|= SYMFILE_VERBOSE
;
294 add_flags
|= SYMFILE_ALWAYS_CONFIRM
;
298 symbol_file_add_main (exec_file_target
.c_str (), add_flags
);
299 exec_file_attach (exec_file_target
.c_str (), from_tty
);
301 catch (gdb_exception_error
&err
)
303 warning (_("loading %ps %s"),
304 styled_string (file_name_style
.style (),
305 exec_file_target
.c_str ()),
306 err
.message
!= NULL
? err
.what () : "error");
315 exec_file_locate_attach (int pid
, int defer_bp_reset
, int from_tty
)
317 char *exec_file_target
;
318 symfile_add_flags add_flags
= 0;
320 /* Do nothing if we already have an executable filename. */
321 if (get_exec_file (0) != NULL
)
324 /* Try to determine a filename from the process itself. */
325 exec_file_target
= target_pid_to_exec_file (pid
);
326 if (exec_file_target
== NULL
)
328 warning (_("No executable has been specified and target does not "
330 "determining executable automatically. "
331 "Try using the \"file\" command."));
335 gdb::unique_xmalloc_ptr
<char> exec_file_host
336 = exec_file_find (exec_file_target
, NULL
);
339 add_flags
|= SYMFILE_DEFER_BP_RESET
;
342 add_flags
|= SYMFILE_VERBOSE
;
344 /* Attempt to open the exec file. */
345 try_open_exec_file (exec_file_host
.get (), current_inferior (), add_flags
);
348 /* Set FILENAME as the new exec file.
350 This function is intended to be behave essentially the same
351 as exec_file_command, except that the latter will detect when
352 a target is being debugged, and will ask the user whether it
353 should be shut down first. (If the answer is "no", then the
354 new file is ignored.)
356 This file is used by exec_file_command, to do the work of opening
357 and processing the exec file after any prompting has happened.
359 And, it is used by child_attach, when the attach command was
360 given a pid but not a exec pathname, and the attach command could
361 figure out the pathname from the pid. (In this case, we shouldn't
362 ask the user whether the current target should be shut down --
363 we're supplying the exec pathname late for good reason.) */
366 exec_file_attach (const char *filename
, int from_tty
)
368 /* First, acquire a reference to the exec_bfd. We release
369 this at the end of the function; but acquiring it now lets the
370 BFD cache return it if this call refers to the same file. */
371 gdb_bfd_ref_ptr exec_bfd_holder
372 = gdb_bfd_ref_ptr::new_reference (current_program_space
->exec_bfd ());
374 /* Remove any previous exec file. */
375 current_program_space
->exec_close ();
377 /* Now open and digest the file the user requested, if any. */
382 printf_unfiltered (_("No executable file now.\n"));
384 set_gdbarch_from_file (NULL
);
388 int load_via_target
= 0;
389 const char *scratch_pathname
, *canonical_pathname
;
393 if (is_target_filename (filename
))
395 if (target_filesystem_is_local ())
396 filename
+= strlen (TARGET_SYSROOT_PREFIX
);
401 gdb::unique_xmalloc_ptr
<char> canonical_storage
, scratch_storage
;
404 /* gdb_bfd_fopen does not support "target:" filenames. */
406 warning (_("writing into executable files is "
407 "not supported for %s sysroots"),
408 TARGET_SYSROOT_PREFIX
);
410 scratch_pathname
= filename
;
412 canonical_pathname
= scratch_pathname
;
416 scratch_chan
= openp (getenv ("PATH"), OPF_TRY_CWD_FIRST
,
417 filename
, write_files
?
418 O_RDWR
| O_BINARY
: O_RDONLY
| O_BINARY
,
420 #if defined(__GO32__) || defined(_WIN32) || defined(__CYGWIN__)
421 if (scratch_chan
< 0)
423 int first_errno
= errno
;
424 char *exename
= (char *) alloca (strlen (filename
) + 5);
426 strcat (strcpy (exename
, filename
), ".exe");
427 scratch_chan
= openp (getenv ("PATH"), OPF_TRY_CWD_FIRST
,
428 exename
, write_files
?
430 : O_RDONLY
| O_BINARY
,
432 if (scratch_chan
< 0)
436 if (scratch_chan
< 0)
437 perror_with_name (filename
);
439 scratch_pathname
= scratch_storage
.get ();
441 /* gdb_bfd_open (and its variants) prefers canonicalized
442 pathname for better BFD caching. */
443 canonical_storage
= gdb_realpath (scratch_pathname
);
444 canonical_pathname
= canonical_storage
.get ();
447 gdb_bfd_ref_ptr temp
;
448 if (write_files
&& !load_via_target
)
449 temp
= gdb_bfd_fopen (canonical_pathname
, gnutarget
,
450 FOPEN_RUB
, scratch_chan
);
452 temp
= gdb_bfd_open (canonical_pathname
, gnutarget
, scratch_chan
);
453 current_program_space
->set_exec_bfd (std::move (temp
));
455 if (!current_program_space
->exec_bfd ())
457 error (_("\"%ps\": could not open as an executable file: %s."),
458 styled_string (file_name_style
.style (), scratch_pathname
),
459 bfd_errmsg (bfd_get_error ()));
462 /* gdb_realpath_keepfile resolves symlinks on the local
463 filesystem and so cannot be used for "target:" files. */
464 gdb_assert (current_program_space
->exec_filename
== nullptr);
466 current_program_space
->exec_filename
467 = (make_unique_xstrdup
468 (bfd_get_filename (current_program_space
->exec_bfd ())));
470 current_program_space
->exec_filename
471 = gdb_realpath_keepfile (scratch_pathname
);
473 if (!bfd_check_format_matches (current_program_space
->exec_bfd (),
474 bfd_object
, &matching
))
476 /* Make sure to close exec_bfd, or else "run" might try to use
478 current_program_space
->exec_close ();
479 error (_("\"%ps\": not in executable format: %s"),
480 styled_string (file_name_style
.style (), scratch_pathname
),
481 gdb_bfd_errmsg (bfd_get_error (), matching
).c_str ());
484 target_section_table sections
485 = build_section_table (current_program_space
->exec_bfd ());
487 current_program_space
->ebfd_mtime
488 = bfd_get_mtime (current_program_space
->exec_bfd ());
492 set_gdbarch_from_file (current_program_space
->exec_bfd ());
494 /* Add the executable's sections to the current address spaces'
495 list of sections. This possibly pushes the exec_ops
497 current_program_space
->add_target_sections (¤t_program_space
->ebfd
,
500 /* Tell display code (if any) about the changed file name. */
501 if (deprecated_exec_file_display_hook
)
502 (*deprecated_exec_file_display_hook
) (filename
);
505 bfd_cache_close_all ();
506 gdb::observers::executable_changed
.notify ();
509 /* Process the first arg in ARGS as the new exec file.
511 Note that we have to explicitly ignore additional args, since we can
512 be called from file_command(), which also calls symbol_file_command()
513 which can take multiple args.
515 If ARGS is NULL, we just want to close the exec file. */
518 exec_file_command (const char *args
, int from_tty
)
520 if (from_tty
&& target_has_execution ()
521 && !query (_("A program is being debugged already.\n"
522 "Are you sure you want to change the file? ")))
523 error (_("File not changed."));
527 /* Scan through the args and pick up the first non option arg
530 gdb_argv
built_argv (args
);
531 char **argv
= built_argv
.get ();
533 for (; (*argv
!= NULL
) && (**argv
== '-'); argv
++)
537 error (_("No executable file name was specified"));
539 gdb::unique_xmalloc_ptr
<char> filename (tilde_expand (*argv
));
540 exec_file_attach (filename
.get (), from_tty
);
543 exec_file_attach (NULL
, from_tty
);
546 /* Set both the exec file and the symbol file, in one command.
547 What a novelty. Why did GDB go through four major releases before this
548 command was added? */
551 file_command (const char *arg
, int from_tty
)
553 /* FIXME, if we lose on reading the symbol file, we should revert
554 the exec file, but that's rough. */
555 exec_file_command (arg
, from_tty
);
556 symbol_file_command (arg
, from_tty
);
557 if (deprecated_file_changed_hook
)
558 deprecated_file_changed_hook (arg
);
562 /* Builds a section table, given args BFD, TABLE. */
565 build_section_table (struct bfd
*some_bfd
)
567 target_section_table table
;
569 for (asection
*asect
: gdb_bfd_sections (some_bfd
))
573 /* Check the section flags, but do not discard zero-length
574 sections, since some symbols may still be attached to this
575 section. For instance, we encountered on sparc-solaris 2.10
576 a shared library with an empty .bss section to which a symbol
577 named "_end" was attached. The address of this symbol still
578 needs to be relocated. */
579 aflag
= bfd_section_flags (asect
);
580 if (!(aflag
& SEC_ALLOC
))
583 table
.emplace_back (bfd_section_vma (asect
),
584 bfd_section_vma (asect
) + bfd_section_size (asect
),
591 /* Add the sections array defined by [SECTIONS..SECTIONS_END[ to the
592 current set of target sections. */
595 program_space::add_target_sections (void *owner
,
596 const target_section_table
§ions
)
598 if (!sections
.empty ())
600 for (const target_section
&s
: sections
)
602 m_target_sections
.push_back (s
);
603 m_target_sections
.back ().owner
= owner
;
606 scoped_restore_current_pspace_and_thread restore_pspace_thread
;
608 /* If these are the first file sections we can provide memory
609 from, push the file_stratum target. Must do this in all
610 inferiors sharing the program space. */
611 for (inferior
*inf
: all_inferiors ())
613 if (inf
->pspace
!= this)
616 if (inf
->target_is_pushed (&exec_ops
))
619 switch_to_inferior_no_thread (inf
);
620 push_target (&exec_ops
);
625 /* Add the sections of OBJFILE to the current set of target sections. */
628 program_space::add_target_sections (struct objfile
*objfile
)
630 struct obj_section
*osect
;
632 gdb_assert (objfile
!= nullptr);
634 /* Compute the number of sections to add. */
635 ALL_OBJFILE_OSECTIONS (objfile
, osect
)
637 if (bfd_section_size (osect
->the_bfd_section
) == 0)
640 m_target_sections
.emplace_back (obj_section_addr (osect
),
641 obj_section_endaddr (osect
),
642 osect
->the_bfd_section
, (void *) objfile
);
646 /* Remove all target sections owned by OWNER.
647 OWNER must be the same value passed to add_target_sections. */
650 program_space::remove_target_sections (void *owner
)
652 gdb_assert (owner
!= NULL
);
654 auto it
= std::remove_if (m_target_sections
.begin (),
655 m_target_sections
.end (),
656 [&] (target_section
§
)
658 return sect
.owner
== owner
;
660 m_target_sections
.erase (it
, m_target_sections
.end ());
662 /* If we don't have any more sections to read memory from,
663 remove the file_stratum target from the stack of each
664 inferior sharing the program space. */
665 if (m_target_sections
.empty ())
667 scoped_restore_current_pspace_and_thread restore_pspace_thread
;
669 for (inferior
*inf
: all_inferiors ())
671 if (inf
->pspace
!= this)
674 switch_to_inferior_no_thread (inf
);
675 unpush_target (&exec_ops
);
685 if (!current_program_space
->target_sections ().empty ())
686 push_target (&exec_ops
);
691 enum target_xfer_status
692 exec_read_partial_read_only (gdb_byte
*readbuf
, ULONGEST offset
,
693 ULONGEST len
, ULONGEST
*xfered_len
)
695 /* It's unduly pedantic to refuse to look at the executable for
696 read-only pieces; so do the equivalent of readonly regions aka
698 if (current_program_space
->exec_bfd () != NULL
)
704 for (s
= current_program_space
->exec_bfd ()->sections
; s
; s
= s
->next
)
706 if ((s
->flags
& SEC_LOAD
) == 0
707 || (s
->flags
& SEC_READONLY
) == 0)
711 size
= bfd_section_size (s
);
712 if (vma
<= offset
&& offset
< (vma
+ size
))
716 amt
= (vma
+ size
) - offset
;
720 amt
= bfd_get_section_contents (current_program_space
->exec_bfd (), s
,
721 readbuf
, offset
- vma
, amt
);
724 return TARGET_XFER_EOF
;
728 return TARGET_XFER_OK
;
734 /* Indicate failure to find the requested memory block. */
735 return TARGET_XFER_E_IO
;
738 /* Return all read-only memory ranges found in the target section
739 table defined by SECTIONS and SECTIONS_END, starting at (and
740 intersected with) MEMADDR for LEN bytes. */
742 static std::vector
<mem_range
>
743 section_table_available_memory (CORE_ADDR memaddr
, ULONGEST len
,
744 const target_section_table
§ions
)
746 std::vector
<mem_range
> memory
;
748 for (const target_section
&p
: sections
)
750 if ((bfd_section_flags (p
.the_bfd_section
) & SEC_READONLY
) == 0)
753 /* Copy the meta-data, adjusted. */
754 if (mem_ranges_overlap (p
.addr
, p
.endaddr
- p
.addr
, memaddr
, len
))
756 ULONGEST lo1
, hi1
, lo2
, hi2
;
764 CORE_ADDR start
= std::max (lo1
, lo2
);
765 int length
= std::min (hi1
, hi2
) - start
;
767 memory
.emplace_back (start
, length
);
774 enum target_xfer_status
775 section_table_read_available_memory (gdb_byte
*readbuf
, ULONGEST offset
,
776 ULONGEST len
, ULONGEST
*xfered_len
)
778 const target_section_table
*table
= target_get_section_table (&exec_ops
);
779 std::vector
<mem_range
> available_memory
780 = section_table_available_memory (offset
, len
, *table
);
782 normalize_mem_ranges (&available_memory
);
784 for (const mem_range
&r
: available_memory
)
786 if (mem_ranges_overlap (r
.start
, r
.length
, offset
, len
))
789 enum target_xfer_status status
;
791 /* Get the intersection window. */
792 end
= std::min
<CORE_ADDR
> (offset
+ len
, r
.start
+ r
.length
);
794 gdb_assert (end
- offset
<= len
);
796 if (offset
>= r
.start
)
797 status
= exec_read_partial_read_only (readbuf
, offset
,
802 *xfered_len
= r
.start
- offset
;
803 status
= TARGET_XFER_UNAVAILABLE
;
810 return TARGET_XFER_UNAVAILABLE
;
813 enum target_xfer_status
814 section_table_xfer_memory_partial (gdb_byte
*readbuf
, const gdb_byte
*writebuf
,
815 ULONGEST offset
, ULONGEST len
,
816 ULONGEST
*xfered_len
,
817 const target_section_table
§ions
,
818 gdb::function_view
<bool
819 (const struct target_section
*)> match_cb
)
822 ULONGEST memaddr
= offset
;
823 ULONGEST memend
= memaddr
+ len
;
825 gdb_assert (len
!= 0);
827 for (const target_section
&p
: sections
)
829 struct bfd_section
*asect
= p
.the_bfd_section
;
830 bfd
*abfd
= asect
->owner
;
832 if (match_cb
!= nullptr && !match_cb (&p
))
833 continue; /* not the section we need. */
834 if (memaddr
>= p
.addr
)
836 if (memend
<= p
.endaddr
)
838 /* Entire transfer is within this section. */
840 res
= bfd_set_section_contents (abfd
, asect
,
841 writebuf
, memaddr
- p
.addr
,
844 res
= bfd_get_section_contents (abfd
, asect
,
845 readbuf
, memaddr
- p
.addr
,
851 return TARGET_XFER_OK
;
854 return TARGET_XFER_EOF
;
856 else if (memaddr
>= p
.endaddr
)
858 /* This section ends before the transfer starts. */
863 /* This section overlaps the transfer. Just do half. */
864 len
= p
.endaddr
- memaddr
;
866 res
= bfd_set_section_contents (abfd
, asect
,
867 writebuf
, memaddr
- p
.addr
,
870 res
= bfd_get_section_contents (abfd
, asect
,
871 readbuf
, memaddr
- p
.addr
,
876 return TARGET_XFER_OK
;
879 return TARGET_XFER_EOF
;
884 return TARGET_XFER_EOF
; /* We can't help. */
887 const target_section_table
*
888 exec_target::get_section_table ()
890 return ¤t_program_space
->target_sections ();
893 enum target_xfer_status
894 exec_target::xfer_partial (enum target_object object
,
895 const char *annex
, gdb_byte
*readbuf
,
896 const gdb_byte
*writebuf
,
897 ULONGEST offset
, ULONGEST len
, ULONGEST
*xfered_len
)
899 const target_section_table
*table
= target_get_section_table (this);
901 if (object
== TARGET_OBJECT_MEMORY
)
902 return section_table_xfer_memory_partial (readbuf
, writebuf
,
903 offset
, len
, xfered_len
,
906 return TARGET_XFER_E_IO
;
911 print_section_info (const target_section_table
*t
, bfd
*abfd
)
913 struct gdbarch
*gdbarch
= gdbarch_from_bfd (abfd
);
914 /* FIXME: 16 is not wide enough when gdbarch_addr_bit > 64. */
915 int wid
= gdbarch_addr_bit (gdbarch
) <= 32 ? 8 : 16;
917 printf_filtered ("\t`%ps', ",
918 styled_string (file_name_style
.style (),
919 bfd_get_filename (abfd
)));
921 printf_filtered (_("file type %s.\n"), bfd_get_target (abfd
));
922 if (abfd
== current_program_space
->exec_bfd ())
924 /* gcc-3.4 does not like the initialization in
925 <p == t->sections_end>. */
926 bfd_vma displacement
= 0;
930 for (const target_section
&p
: *t
)
932 struct bfd_section
*psect
= p
.the_bfd_section
;
934 if ((bfd_section_flags (psect
) & (SEC_ALLOC
| SEC_LOAD
))
935 != (SEC_ALLOC
| SEC_LOAD
))
938 if (bfd_section_vma (psect
) <= abfd
->start_address
939 && abfd
->start_address
< (bfd_section_vma (psect
)
940 + bfd_section_size (psect
)))
942 displacement
= p
.addr
- bfd_section_vma (psect
);
948 warning (_("Cannot find section for the entry point of %ps."),
949 styled_string (file_name_style
.style (),
950 bfd_get_filename (abfd
)));
952 entry_point
= gdbarch_addr_bits_remove (gdbarch
,
953 bfd_get_start_address (abfd
)
955 printf_filtered (_("\tEntry point: %s\n"),
956 paddress (gdbarch
, entry_point
));
958 for (const target_section
&p
: *t
)
960 struct bfd_section
*psect
= p
.the_bfd_section
;
961 bfd
*pbfd
= psect
->owner
;
963 printf_filtered ("\t%s", hex_string_custom (p
.addr
, wid
));
964 printf_filtered (" - %s", hex_string_custom (p
.endaddr
, wid
));
966 /* FIXME: A format of "08l" is not wide enough for file offsets
967 larger than 4GB. OTOH, making it "016l" isn't desirable either
968 since most output will then be much wider than necessary. It
969 may make sense to test the size of the file and choose the
970 format string accordingly. */
971 /* FIXME: i18n: Need to rewrite this sentence. */
973 printf_filtered (" @ %s",
974 hex_string_custom (psect
->filepos
, 8));
975 printf_filtered (" is %s", bfd_section_name (psect
));
977 printf_filtered (" in %ps",
978 styled_string (file_name_style
.style (),
979 bfd_get_filename (pbfd
)));
980 printf_filtered ("\n");
985 exec_target::files_info ()
987 if (current_program_space
->exec_bfd ())
988 print_section_info (¤t_program_space
->target_sections (),
989 current_program_space
->exec_bfd ());
991 puts_filtered (_("\t<no file loaded>\n"));
995 set_section_command (const char *args
, int from_tty
)
999 unsigned long secaddr
;
1004 error (_("Must specify section name and its virtual address"));
1006 /* Parse out section name. */
1007 for (secname
= args
; !isspace (*args
); args
++);
1008 seclen
= args
- secname
;
1010 /* Parse out new virtual address. */
1011 secaddr
= parse_and_eval_address (args
);
1013 for (target_section
&p
: current_program_space
->target_sections ())
1015 if (!strncmp (secname
, bfd_section_name (p
.the_bfd_section
), seclen
)
1016 && bfd_section_name (p
.the_bfd_section
)[seclen
] == '\0')
1018 offset
= secaddr
- p
.addr
;
1020 p
.endaddr
+= offset
;
1022 exec_ops
.files_info ();
1026 if (seclen
>= sizeof (secprint
))
1027 seclen
= sizeof (secprint
) - 1;
1028 strncpy (secprint
, secname
, seclen
);
1029 secprint
[seclen
] = '\0';
1030 error (_("Section %s not found"), secprint
);
1033 /* If we can find a section in FILENAME with BFD index INDEX, adjust
1037 exec_set_section_address (const char *filename
, int index
, CORE_ADDR address
)
1039 for (target_section
&p
: current_program_space
->target_sections ())
1041 if (filename_cmp (filename
,
1042 bfd_get_filename (p
.the_bfd_section
->owner
)) == 0
1043 && index
== p
.the_bfd_section
->index
)
1045 p
.endaddr
+= address
- p
.addr
;
1052 exec_target::has_memory ()
1054 /* We can provide memory if we have any file/target sections to read
1056 return !current_program_space
->target_sections ().empty ();
1059 gdb::unique_xmalloc_ptr
<char>
1060 exec_target::make_corefile_notes (bfd
*obfd
, int *note_size
)
1062 error (_("Can't create a corefile"));
1066 exec_target::find_memory_regions (find_memory_region_ftype func
, void *data
)
1068 return objfile_find_memory_regions (this, func
, data
);
1071 void _initialize_exec ();
1075 struct cmd_list_element
*c
;
1079 c
= add_cmd ("file", class_files
, file_command
, _("\
1080 Use FILE as program to be debugged.\n\
1081 It is read for its symbols, for getting the contents of pure memory,\n\
1082 and it is the program executed when you use the `run' command.\n\
1083 If FILE cannot be found as specified, your execution directory path\n\
1084 ($PATH) is searched for a command of that name.\n\
1085 No arg means to have no executable file and no symbols."), &cmdlist
);
1086 set_cmd_completer (c
, filename_completer
);
1089 c
= add_cmd ("exec-file", class_files
, exec_file_command
, _("\
1090 Use FILE as program for getting contents of pure memory.\n\
1091 If FILE cannot be found as specified, your execution directory path\n\
1092 is searched for a command of that name.\n\
1093 No arg means have no executable file."), &cmdlist
);
1094 set_cmd_completer (c
, filename_completer
);
1096 add_com ("section", class_files
, set_section_command
, _("\
1097 Change the base address of section SECTION of the exec file to ADDR.\n\
1098 This can be used if the exec file does not contain section addresses,\n\
1099 (such as in the a.out format), or when the addresses specified in the\n\
1100 file itself are wrong. Each section must be changed separately. The\n\
1101 ``info files'' command lists all the sections and their addresses."));
1103 add_setshow_boolean_cmd ("write", class_support
, &write_files
, _("\
1104 Set writing into executable and core files."), _("\
1105 Show writing into executable and core files."), NULL
,
1108 &setlist
, &showlist
);
1110 add_setshow_enum_cmd ("exec-file-mismatch", class_support
,
1111 exec_file_mismatch_names
,
1112 &exec_file_mismatch
,
1114 Set exec-file-mismatch handling (ask|warn|off)."),
1116 Show exec-file-mismatch handling (ask|warn|off)."),
1118 Specifies how to handle a mismatch between the current exec-file\n\
1119 loaded by GDB and the exec-file automatically determined when attaching\n\
1121 ask - warn the user and ask whether to load the determined exec-file.\n\
1122 warn - warn the user, but do not change the exec-file.\n\
1123 off - do not check for mismatch.\n\
1125 GDB detects a mismatch by comparing the build IDs of the files.\n\
1126 If the user confirms loading the determined exec-file, then its symbols\n\
1127 will be loaded as well."),
1128 set_exec_file_mismatch_command
,
1129 show_exec_file_mismatch_command
,
1130 &setlist
, &showlist
);
1132 add_target (exec_target_info
, exec_target_open
, filename_completer
);