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 scoped_restore_current_program_space restore_pspace
;
182 for (struct program_space
*ss
: program_spaces
)
184 set_current_program_space (ss
);
185 clear_section_table (current_target_sections
);
193 try_open_exec_file (const char *exec_file_host
, struct inferior
*inf
,
194 symfile_add_flags add_flags
)
196 struct gdb_exception prev_err
;
198 /* exec_file_attach and symbol_file_add_main may throw an error if the file
199 cannot be opened either locally or remotely.
201 This happens for example, when the file is first found in the local
202 sysroot (above), and then disappears (a TOCTOU race), or when it doesn't
203 exist in the target filesystem, or when the file does exist, but
206 Even without a symbol file, the remote-based debugging session should
207 continue normally instead of ending abruptly. Hence we catch thrown
208 errors/exceptions in the following code. */
211 /* We must do this step even if exec_file_host is NULL, so that
212 exec_file_attach will clear state. */
213 exec_file_attach (exec_file_host
, add_flags
& SYMFILE_VERBOSE
);
215 catch (gdb_exception_error
&err
)
217 if (err
.message
!= NULL
)
218 warning ("%s", err
.what ());
220 prev_err
= std::move (err
);
223 if (exec_file_host
!= NULL
)
227 symbol_file_add_main (exec_file_host
, add_flags
);
229 catch (const gdb_exception_error
&err
)
231 if (!exception_print_same (prev_err
, err
))
232 warning ("%s", err
.what ());
240 validate_exec_file (int from_tty
)
242 /* If user asked to ignore the mismatch, do nothing. */
243 if (exec_file_mismatch_mode
== exec_file_mismatch_off
)
246 const char *current_exec_file
= get_exec_file (0);
247 struct inferior
*inf
= current_inferior ();
248 /* Try to determine a filename from the process itself. */
249 const char *pid_exec_file
= target_pid_to_exec_file (inf
->pid
);
251 /* If wee cannot validate the exec file, return. */
252 if (current_exec_file
== NULL
|| pid_exec_file
== NULL
)
255 std::string
exec_file_target (pid_exec_file
);
257 /* In case the exec file is not local, exec_file_target has to point at
258 the target file system. */
259 if (is_target_filename (current_exec_file
) && !target_filesystem_is_local ())
260 exec_file_target
= TARGET_SYSROOT_PREFIX
+ exec_file_target
;
262 if (exec_file_target
!= current_exec_file
)
265 (_("Mismatch between current exec-file %ps\n"
266 "and automatically determined exec-file %ps\n"
267 "exec-file-mismatch handling is currently \"%s\""),
268 styled_string (file_name_style
.style (), current_exec_file
),
269 styled_string (file_name_style
.style (), exec_file_target
.c_str ()),
270 exec_file_mismatch_names
[exec_file_mismatch_mode
]);
271 if (exec_file_mismatch_mode
== exec_file_mismatch_ask
)
273 symfile_add_flags add_flags
= SYMFILE_MAINLINE
;
275 add_flags
|= SYMFILE_VERBOSE
;
278 symbol_file_add_main (exec_file_target
.c_str (), add_flags
);
279 exec_file_attach (exec_file_target
.c_str (), from_tty
);
281 catch (gdb_exception_error
&err
)
283 warning (_("loading %ps %s"),
284 styled_string (file_name_style
.style (),
285 exec_file_target
.c_str ()),
286 err
.message
!= NULL
? err
.what () : "error");
295 exec_file_locate_attach (int pid
, int defer_bp_reset
, int from_tty
)
297 char *exec_file_target
;
298 symfile_add_flags add_flags
= 0;
300 /* Do nothing if we already have an executable filename. */
301 if (get_exec_file (0) != NULL
)
304 /* Try to determine a filename from the process itself. */
305 exec_file_target
= target_pid_to_exec_file (pid
);
306 if (exec_file_target
== NULL
)
308 warning (_("No executable has been specified and target does not "
310 "determining executable automatically. "
311 "Try using the \"file\" command."));
315 gdb::unique_xmalloc_ptr
<char> exec_file_host
316 = exec_file_find (exec_file_target
, NULL
);
319 add_flags
|= SYMFILE_DEFER_BP_RESET
;
322 add_flags
|= SYMFILE_VERBOSE
;
324 /* Attempt to open the exec file. */
325 try_open_exec_file (exec_file_host
.get (), current_inferior (), add_flags
);
328 /* Set FILENAME as the new exec file.
330 This function is intended to be behave essentially the same
331 as exec_file_command, except that the latter will detect when
332 a target is being debugged, and will ask the user whether it
333 should be shut down first. (If the answer is "no", then the
334 new file is ignored.)
336 This file is used by exec_file_command, to do the work of opening
337 and processing the exec file after any prompting has happened.
339 And, it is used by child_attach, when the attach command was
340 given a pid but not a exec pathname, and the attach command could
341 figure out the pathname from the pid. (In this case, we shouldn't
342 ask the user whether the current target should be shut down --
343 we're supplying the exec pathname late for good reason.) */
346 exec_file_attach (const char *filename
, int from_tty
)
348 /* First, acquire a reference to the current exec_bfd. We release
349 this at the end of the function; but acquiring it now lets the
350 BFD cache return it if this call refers to the same file. */
351 gdb_bfd_ref_ptr exec_bfd_holder
= gdb_bfd_ref_ptr::new_reference (exec_bfd
);
353 /* Remove any previous exec file. */
356 /* Now open and digest the file the user requested, if any. */
361 printf_unfiltered (_("No executable file now.\n"));
363 set_gdbarch_from_file (NULL
);
367 int load_via_target
= 0;
368 const char *scratch_pathname
, *canonical_pathname
;
370 struct target_section
*sections
= NULL
, *sections_end
= NULL
;
373 if (is_target_filename (filename
))
375 if (target_filesystem_is_local ())
376 filename
+= strlen (TARGET_SYSROOT_PREFIX
);
381 gdb::unique_xmalloc_ptr
<char> canonical_storage
, scratch_storage
;
384 /* gdb_bfd_fopen does not support "target:" filenames. */
386 warning (_("writing into executable files is "
387 "not supported for %s sysroots"),
388 TARGET_SYSROOT_PREFIX
);
390 scratch_pathname
= filename
;
392 canonical_pathname
= scratch_pathname
;
396 scratch_chan
= openp (getenv ("PATH"), OPF_TRY_CWD_FIRST
,
397 filename
, write_files
?
398 O_RDWR
| O_BINARY
: O_RDONLY
| O_BINARY
,
400 #if defined(__GO32__) || defined(_WIN32) || defined(__CYGWIN__)
401 if (scratch_chan
< 0)
403 char *exename
= (char *) alloca (strlen (filename
) + 5);
405 strcat (strcpy (exename
, filename
), ".exe");
406 scratch_chan
= openp (getenv ("PATH"), OPF_TRY_CWD_FIRST
,
407 exename
, write_files
?
409 : O_RDONLY
| O_BINARY
,
413 if (scratch_chan
< 0)
414 perror_with_name (filename
);
416 scratch_pathname
= scratch_storage
.get ();
418 /* gdb_bfd_open (and its variants) prefers canonicalized
419 pathname for better BFD caching. */
420 canonical_storage
= gdb_realpath (scratch_pathname
);
421 canonical_pathname
= canonical_storage
.get ();
424 gdb_bfd_ref_ptr temp
;
425 if (write_files
&& !load_via_target
)
426 temp
= gdb_bfd_fopen (canonical_pathname
, gnutarget
,
427 FOPEN_RUB
, scratch_chan
);
429 temp
= gdb_bfd_open (canonical_pathname
, gnutarget
, scratch_chan
);
430 exec_bfd
= temp
.release ();
434 error (_("\"%ps\": could not open as an executable file: %s."),
435 styled_string (file_name_style
.style (), scratch_pathname
),
436 bfd_errmsg (bfd_get_error ()));
439 /* gdb_realpath_keepfile resolves symlinks on the local
440 filesystem and so cannot be used for "target:" files. */
441 gdb_assert (exec_filename
== NULL
);
443 exec_filename
= xstrdup (bfd_get_filename (exec_bfd
));
445 exec_filename
= gdb_realpath_keepfile (scratch_pathname
).release ();
447 if (!bfd_check_format_matches (exec_bfd
, bfd_object
, &matching
))
449 /* Make sure to close exec_bfd, or else "run" might try to use
452 error (_("\"%ps\": not in executable format: %s"),
453 styled_string (file_name_style
.style (), scratch_pathname
),
454 gdb_bfd_errmsg (bfd_get_error (), matching
).c_str ());
457 if (build_section_table (exec_bfd
, §ions
, §ions_end
))
459 /* Make sure to close exec_bfd, or else "run" might try to use
462 error (_("\"%ps\": can't find the file sections: %s"),
463 styled_string (file_name_style
.style (), scratch_pathname
),
464 bfd_errmsg (bfd_get_error ()));
467 exec_bfd_mtime
= bfd_get_mtime (exec_bfd
);
471 set_gdbarch_from_file (exec_bfd
);
473 /* Add the executable's sections to the current address spaces'
474 list of sections. This possibly pushes the exec_ops
476 add_target_sections (&exec_bfd
, sections
, sections_end
);
479 /* Tell display code (if any) about the changed file name. */
480 if (deprecated_exec_file_display_hook
)
481 (*deprecated_exec_file_display_hook
) (filename
);
484 bfd_cache_close_all ();
485 gdb::observers::executable_changed
.notify ();
488 /* Process the first arg in ARGS as the new exec file.
490 Note that we have to explicitly ignore additional args, since we can
491 be called from file_command(), which also calls symbol_file_command()
492 which can take multiple args.
494 If ARGS is NULL, we just want to close the exec file. */
497 exec_file_command (const char *args
, int from_tty
)
499 if (from_tty
&& target_has_execution
500 && !query (_("A program is being debugged already.\n"
501 "Are you sure you want to change the file? ")))
502 error (_("File not changed."));
506 /* Scan through the args and pick up the first non option arg
509 gdb_argv
built_argv (args
);
510 char **argv
= built_argv
.get ();
512 for (; (*argv
!= NULL
) && (**argv
== '-'); argv
++)
516 error (_("No executable file name was specified"));
518 gdb::unique_xmalloc_ptr
<char> filename (tilde_expand (*argv
));
519 exec_file_attach (filename
.get (), from_tty
);
522 exec_file_attach (NULL
, from_tty
);
525 /* Set both the exec file and the symbol file, in one command.
526 What a novelty. Why did GDB go through four major releases before this
527 command was added? */
530 file_command (const char *arg
, int from_tty
)
532 /* FIXME, if we lose on reading the symbol file, we should revert
533 the exec file, but that's rough. */
534 exec_file_command (arg
, from_tty
);
535 symbol_file_command (arg
, from_tty
);
536 if (deprecated_file_changed_hook
)
537 deprecated_file_changed_hook (arg
);
541 /* Locate all mappable sections of a BFD file.
542 table_pp_char is a char * to get it through bfd_map_over_sections;
543 we cast it back to its proper type. */
546 add_to_section_table (bfd
*abfd
, struct bfd_section
*asect
,
549 struct target_section
**table_pp
= (struct target_section
**) table_pp_char
;
552 gdb_assert (abfd
== asect
->owner
);
554 /* Check the section flags, but do not discard zero-length sections, since
555 some symbols may still be attached to this section. For instance, we
556 encountered on sparc-solaris 2.10 a shared library with an empty .bss
557 section to which a symbol named "_end" was attached. The address
558 of this symbol still needs to be relocated. */
559 aflag
= bfd_section_flags (asect
);
560 if (!(aflag
& SEC_ALLOC
))
563 (*table_pp
)->owner
= NULL
;
564 (*table_pp
)->the_bfd_section
= asect
;
565 (*table_pp
)->addr
= bfd_section_vma (asect
);
566 (*table_pp
)->endaddr
= (*table_pp
)->addr
+ bfd_section_size (asect
);
573 clear_section_table (struct target_section_table
*table
)
575 xfree (table
->sections
);
576 table
->sections
= table
->sections_end
= NULL
;
579 /* Resize section table TABLE by ADJUSTMENT.
580 ADJUSTMENT may be negative, in which case the caller must have already
581 removed the sections being deleted.
582 Returns the old size. */
585 resize_section_table (struct target_section_table
*table
, int adjustment
)
590 old_count
= table
->sections_end
- table
->sections
;
592 new_count
= adjustment
+ old_count
;
596 table
->sections
= XRESIZEVEC (struct target_section
, table
->sections
,
598 table
->sections_end
= table
->sections
+ new_count
;
601 clear_section_table (table
);
606 /* Builds a section table, given args BFD, SECTABLE_PTR, SECEND_PTR.
607 Returns 0 if OK, 1 on error. */
610 build_section_table (struct bfd
*some_bfd
, struct target_section
**start
,
611 struct target_section
**end
)
615 count
= bfd_count_sections (some_bfd
);
618 *start
= XNEWVEC (struct target_section
, count
);
620 bfd_map_over_sections (some_bfd
, add_to_section_table
, (char *) end
);
622 gdb_assert (*end
<= *start
+ count
);
624 /* We could realloc the table, but it probably loses for most files. */
628 /* Add the sections array defined by [SECTIONS..SECTIONS_END[ to the
629 current set of target sections. */
632 add_target_sections (void *owner
,
633 struct target_section
*sections
,
634 struct target_section
*sections_end
)
637 struct target_section_table
*table
= current_target_sections
;
639 count
= sections_end
- sections
;
643 int space
= resize_section_table (table
, count
);
646 for (i
= 0; i
< count
; ++i
)
648 table
->sections
[space
+ i
] = sections
[i
];
649 table
->sections
[space
+ i
].owner
= owner
;
652 scoped_restore_current_pspace_and_thread restore_pspace_thread
;
653 program_space
*curr_pspace
= current_program_space
;
655 /* If these are the first file sections we can provide memory
656 from, push the file_stratum target. Must do this in all
657 inferiors sharing the program space. */
658 for (inferior
*inf
: all_inferiors ())
660 if (inf
->pspace
!= curr_pspace
)
663 if (inf
->target_is_pushed (&exec_ops
))
666 switch_to_inferior_no_thread (inf
);
667 push_target (&exec_ops
);
672 /* Add the sections of OBJFILE to the current set of target sections. */
675 add_target_sections_of_objfile (struct objfile
*objfile
)
677 struct target_section_table
*table
= current_target_sections
;
678 struct obj_section
*osect
;
681 struct target_section
*ts
;
686 /* Compute the number of sections to add. */
687 ALL_OBJFILE_OSECTIONS (objfile
, osect
)
689 if (bfd_section_size (osect
->the_bfd_section
) == 0)
697 space
= resize_section_table (table
, count
);
699 ts
= table
->sections
+ space
;
701 ALL_OBJFILE_OSECTIONS (objfile
, osect
)
703 if (bfd_section_size (osect
->the_bfd_section
) == 0)
706 gdb_assert (ts
< table
->sections
+ space
+ count
);
708 ts
->addr
= obj_section_addr (osect
);
709 ts
->endaddr
= obj_section_endaddr (osect
);
710 ts
->the_bfd_section
= osect
->the_bfd_section
;
711 ts
->owner
= (void *) objfile
;
717 /* Remove all target sections owned by OWNER.
718 OWNER must be the same value passed to add_target_sections. */
721 remove_target_sections (void *owner
)
723 struct target_section
*src
, *dest
;
724 struct target_section_table
*table
= current_target_sections
;
726 gdb_assert (owner
!= NULL
);
728 dest
= table
->sections
;
729 for (src
= table
->sections
; src
< table
->sections_end
; src
++)
730 if (src
->owner
!= owner
)
732 /* Keep this section. */
738 /* If we've dropped any sections, resize the section table. */
743 old_count
= resize_section_table (table
, dest
- src
);
745 /* If we don't have any more sections to read memory from,
746 remove the file_stratum target from the stack of each
747 inferior sharing the program space. */
748 if (old_count
+ (dest
- src
) == 0)
750 scoped_restore_current_pspace_and_thread restore_pspace_thread
;
751 program_space
*curr_pspace
= current_program_space
;
753 for (inferior
*inf
: all_inferiors ())
755 if (inf
->pspace
!= curr_pspace
)
758 if (inf
->pspace
->target_sections
.sections
759 != inf
->pspace
->target_sections
.sections_end
)
762 switch_to_inferior_no_thread (inf
);
763 unpush_target (&exec_ops
);
774 if (current_program_space
->target_sections
.sections
775 != current_program_space
->target_sections
.sections_end
)
776 push_target (&exec_ops
);
781 enum target_xfer_status
782 exec_read_partial_read_only (gdb_byte
*readbuf
, ULONGEST offset
,
783 ULONGEST len
, ULONGEST
*xfered_len
)
785 /* It's unduly pedantic to refuse to look at the executable for
786 read-only pieces; so do the equivalent of readonly regions aka
788 if (exec_bfd
!= NULL
)
794 for (s
= exec_bfd
->sections
; s
; s
= s
->next
)
796 if ((s
->flags
& SEC_LOAD
) == 0
797 || (s
->flags
& SEC_READONLY
) == 0)
801 size
= bfd_section_size (s
);
802 if (vma
<= offset
&& offset
< (vma
+ size
))
806 amt
= (vma
+ size
) - offset
;
810 amt
= bfd_get_section_contents (exec_bfd
, s
,
811 readbuf
, offset
- vma
, amt
);
814 return TARGET_XFER_EOF
;
818 return TARGET_XFER_OK
;
824 /* Indicate failure to find the requested memory block. */
825 return TARGET_XFER_E_IO
;
828 /* Return all read-only memory ranges found in the target section
829 table defined by SECTIONS and SECTIONS_END, starting at (and
830 intersected with) MEMADDR for LEN bytes. */
832 static std::vector
<mem_range
>
833 section_table_available_memory (CORE_ADDR memaddr
, ULONGEST len
,
834 struct target_section
*sections
,
835 struct target_section
*sections_end
)
837 std::vector
<mem_range
> memory
;
839 for (target_section
*p
= sections
; p
< sections_end
; p
++)
841 if ((bfd_section_flags (p
->the_bfd_section
) & SEC_READONLY
) == 0)
844 /* Copy the meta-data, adjusted. */
845 if (mem_ranges_overlap (p
->addr
, p
->endaddr
- p
->addr
, memaddr
, len
))
847 ULONGEST lo1
, hi1
, lo2
, hi2
;
855 CORE_ADDR start
= std::max (lo1
, lo2
);
856 int length
= std::min (hi1
, hi2
) - start
;
858 memory
.emplace_back (start
, length
);
865 enum target_xfer_status
866 section_table_read_available_memory (gdb_byte
*readbuf
, ULONGEST offset
,
867 ULONGEST len
, ULONGEST
*xfered_len
)
869 target_section_table
*table
= target_get_section_table (&exec_ops
);
870 std::vector
<mem_range
> available_memory
871 = section_table_available_memory (offset
, len
,
872 table
->sections
, table
->sections_end
);
874 normalize_mem_ranges (&available_memory
);
876 for (const mem_range
&r
: available_memory
)
878 if (mem_ranges_overlap (r
.start
, r
.length
, offset
, len
))
881 enum target_xfer_status status
;
883 /* Get the intersection window. */
884 end
= std::min
<CORE_ADDR
> (offset
+ len
, r
.start
+ r
.length
);
886 gdb_assert (end
- offset
<= len
);
888 if (offset
>= r
.start
)
889 status
= exec_read_partial_read_only (readbuf
, offset
,
894 *xfered_len
= r
.start
- offset
;
895 status
= TARGET_XFER_UNAVAILABLE
;
902 return TARGET_XFER_UNAVAILABLE
;
905 enum target_xfer_status
906 section_table_xfer_memory_partial (gdb_byte
*readbuf
, const gdb_byte
*writebuf
,
907 ULONGEST offset
, ULONGEST len
,
908 ULONGEST
*xfered_len
,
909 struct target_section
*sections
,
910 struct target_section
*sections_end
,
911 const char *section_name
)
914 struct target_section
*p
;
915 ULONGEST memaddr
= offset
;
916 ULONGEST memend
= memaddr
+ len
;
918 gdb_assert (len
!= 0);
920 for (p
= sections
; p
< sections_end
; p
++)
922 struct bfd_section
*asect
= p
->the_bfd_section
;
923 bfd
*abfd
= asect
->owner
;
925 if (section_name
&& strcmp (section_name
, asect
->name
) != 0)
926 continue; /* not the section we need. */
927 if (memaddr
>= p
->addr
)
929 if (memend
<= p
->endaddr
)
931 /* Entire transfer is within this section. */
933 res
= bfd_set_section_contents (abfd
, asect
,
934 writebuf
, memaddr
- p
->addr
,
937 res
= bfd_get_section_contents (abfd
, asect
,
938 readbuf
, memaddr
- p
->addr
,
944 return TARGET_XFER_OK
;
947 return TARGET_XFER_EOF
;
949 else if (memaddr
>= p
->endaddr
)
951 /* This section ends before the transfer starts. */
956 /* This section overlaps the transfer. Just do half. */
957 len
= p
->endaddr
- memaddr
;
959 res
= bfd_set_section_contents (abfd
, asect
,
960 writebuf
, memaddr
- p
->addr
,
963 res
= bfd_get_section_contents (abfd
, asect
,
964 readbuf
, memaddr
- p
->addr
,
969 return TARGET_XFER_OK
;
972 return TARGET_XFER_EOF
;
977 return TARGET_XFER_EOF
; /* We can't help. */
980 struct target_section_table
*
981 exec_target::get_section_table ()
983 return current_target_sections
;
986 enum target_xfer_status
987 exec_target::xfer_partial (enum target_object object
,
988 const char *annex
, gdb_byte
*readbuf
,
989 const gdb_byte
*writebuf
,
990 ULONGEST offset
, ULONGEST len
, ULONGEST
*xfered_len
)
992 struct target_section_table
*table
= get_section_table ();
994 if (object
== TARGET_OBJECT_MEMORY
)
995 return section_table_xfer_memory_partial (readbuf
, writebuf
,
996 offset
, len
, xfered_len
,
1001 return TARGET_XFER_E_IO
;
1006 print_section_info (struct target_section_table
*t
, bfd
*abfd
)
1008 struct gdbarch
*gdbarch
= gdbarch_from_bfd (abfd
);
1009 struct target_section
*p
;
1010 /* FIXME: 16 is not wide enough when gdbarch_addr_bit > 64. */
1011 int wid
= gdbarch_addr_bit (gdbarch
) <= 32 ? 8 : 16;
1013 printf_filtered ("\t`%ps', ",
1014 styled_string (file_name_style
.style (),
1015 bfd_get_filename (abfd
)));
1017 printf_filtered (_("file type %s.\n"), bfd_get_target (abfd
));
1018 if (abfd
== exec_bfd
)
1020 /* gcc-3.4 does not like the initialization in
1021 <p == t->sections_end>. */
1022 bfd_vma displacement
= 0;
1023 bfd_vma entry_point
;
1025 for (p
= t
->sections
; p
< t
->sections_end
; p
++)
1027 struct bfd_section
*psect
= p
->the_bfd_section
;
1029 if ((bfd_section_flags (psect
) & (SEC_ALLOC
| SEC_LOAD
))
1030 != (SEC_ALLOC
| SEC_LOAD
))
1033 if (bfd_section_vma (psect
) <= abfd
->start_address
1034 && abfd
->start_address
< (bfd_section_vma (psect
)
1035 + bfd_section_size (psect
)))
1037 displacement
= p
->addr
- bfd_section_vma (psect
);
1041 if (p
== t
->sections_end
)
1042 warning (_("Cannot find section for the entry point of %ps."),
1043 styled_string (file_name_style
.style (),
1044 bfd_get_filename (abfd
)));
1046 entry_point
= gdbarch_addr_bits_remove (gdbarch
,
1047 bfd_get_start_address (abfd
)
1049 printf_filtered (_("\tEntry point: %s\n"),
1050 paddress (gdbarch
, entry_point
));
1052 for (p
= t
->sections
; p
< t
->sections_end
; p
++)
1054 struct bfd_section
*psect
= p
->the_bfd_section
;
1055 bfd
*pbfd
= psect
->owner
;
1057 printf_filtered ("\t%s", hex_string_custom (p
->addr
, wid
));
1058 printf_filtered (" - %s", hex_string_custom (p
->endaddr
, wid
));
1060 /* FIXME: A format of "08l" is not wide enough for file offsets
1061 larger than 4GB. OTOH, making it "016l" isn't desirable either
1062 since most output will then be much wider than necessary. It
1063 may make sense to test the size of the file and choose the
1064 format string accordingly. */
1065 /* FIXME: i18n: Need to rewrite this sentence. */
1067 printf_filtered (" @ %s",
1068 hex_string_custom (psect
->filepos
, 8));
1069 printf_filtered (" is %s", bfd_section_name (psect
));
1071 printf_filtered (" in %ps",
1072 styled_string (file_name_style
.style (),
1073 bfd_get_filename (pbfd
)));
1074 printf_filtered ("\n");
1079 exec_target::files_info ()
1082 print_section_info (current_target_sections
, exec_bfd
);
1084 puts_filtered (_("\t<no file loaded>\n"));
1088 set_section_command (const char *args
, int from_tty
)
1090 struct target_section
*p
;
1091 const char *secname
;
1093 unsigned long secaddr
;
1096 struct target_section_table
*table
;
1099 error (_("Must specify section name and its virtual address"));
1101 /* Parse out section name. */
1102 for (secname
= args
; !isspace (*args
); args
++);
1103 seclen
= args
- secname
;
1105 /* Parse out new virtual address. */
1106 secaddr
= parse_and_eval_address (args
);
1108 table
= current_target_sections
;
1109 for (p
= table
->sections
; p
< table
->sections_end
; p
++)
1111 if (!strncmp (secname
, bfd_section_name (p
->the_bfd_section
), seclen
)
1112 && bfd_section_name (p
->the_bfd_section
)[seclen
] == '\0')
1114 offset
= secaddr
- p
->addr
;
1116 p
->endaddr
+= offset
;
1118 exec_ops
.files_info ();
1122 if (seclen
>= sizeof (secprint
))
1123 seclen
= sizeof (secprint
) - 1;
1124 strncpy (secprint
, secname
, seclen
);
1125 secprint
[seclen
] = '\0';
1126 error (_("Section %s not found"), secprint
);
1129 /* If we can find a section in FILENAME with BFD index INDEX, adjust
1133 exec_set_section_address (const char *filename
, int index
, CORE_ADDR address
)
1135 struct target_section
*p
;
1136 struct target_section_table
*table
;
1138 table
= current_target_sections
;
1139 for (p
= table
->sections
; p
< table
->sections_end
; p
++)
1141 if (filename_cmp (filename
, p
->the_bfd_section
->owner
->filename
) == 0
1142 && index
== p
->the_bfd_section
->index
)
1144 p
->endaddr
+= address
- p
->addr
;
1151 exec_target::has_memory ()
1153 /* We can provide memory if we have any file/target sections to read
1155 return (current_target_sections
->sections
1156 != current_target_sections
->sections_end
);
1160 exec_target::make_corefile_notes (bfd
*obfd
, int *note_size
)
1162 error (_("Can't create a corefile"));
1166 exec_target::find_memory_regions (find_memory_region_ftype func
, void *data
)
1168 return objfile_find_memory_regions (this, func
, data
);
1171 void _initialize_exec ();
1175 struct cmd_list_element
*c
;
1179 c
= add_cmd ("file", class_files
, file_command
, _("\
1180 Use FILE as program to be debugged.\n\
1181 It is read for its symbols, for getting the contents of pure memory,\n\
1182 and it is the program executed when you use the `run' command.\n\
1183 If FILE cannot be found as specified, your execution directory path\n\
1184 ($PATH) is searched for a command of that name.\n\
1185 No arg means to have no executable file and no symbols."), &cmdlist
);
1186 set_cmd_completer (c
, filename_completer
);
1189 c
= add_cmd ("exec-file", class_files
, exec_file_command
, _("\
1190 Use FILE as program for getting contents of pure memory.\n\
1191 If FILE cannot be found as specified, your execution directory path\n\
1192 is searched for a command of that name.\n\
1193 No arg means have no executable file."), &cmdlist
);
1194 set_cmd_completer (c
, filename_completer
);
1196 add_com ("section", class_files
, set_section_command
, _("\
1197 Change the base address of section SECTION of the exec file to ADDR.\n\
1198 This can be used if the exec file does not contain section addresses,\n\
1199 (such as in the a.out format), or when the addresses specified in the\n\
1200 file itself are wrong. Each section must be changed separately. The\n\
1201 ``info files'' command lists all the sections and their addresses."));
1203 add_setshow_boolean_cmd ("write", class_support
, &write_files
, _("\
1204 Set writing into executable and core files."), _("\
1205 Show writing into executable and core files."), NULL
,
1208 &setlist
, &showlist
);
1210 add_setshow_enum_cmd ("exec-file-mismatch", class_support
,
1211 exec_file_mismatch_names
,
1212 &exec_file_mismatch
,
1214 Set exec-file-mismatch handling (ask|warn|off)."),
1216 Show exec-file-mismatch handling (ask|warn|off)."),
1218 Specifies how to handle a mismatch between the current exec-file name\n\
1219 loaded by GDB and the exec-file name automatically determined when attaching\n\
1221 ask - warn the user and ask whether to load the determined exec-file.\n\
1222 warn - warn the user, but do not change the exec-file.\n\
1223 off - do not check for mismatch."),
1224 set_exec_file_mismatch_command
,
1225 show_exec_file_mismatch_command
,
1226 &setlist
, &showlist
);
1228 add_target (exec_target_info
, exec_target_open
, filename_completer
);