1 /* Core dump and executable file functions below target vector, for GDB.
3 Copyright (C) 1986, 1987, 1989, 1991, 1992, 1993, 1994, 1995, 1996, 1997,
4 1998, 1999, 2000, 2001, 2003, 2004, 2005, 2006, 2007, 2008, 2009, 2010,
5 2011 Free Software Foundation, Inc.
7 This file is part of GDB.
9 This program is free software; you can redistribute it and/or modify
10 it under the terms of the GNU General Public License as published by
11 the Free Software Foundation; either version 3 of the License, or
12 (at your option) any later version.
14 This program is distributed in the hope that it will be useful,
15 but WITHOUT ANY WARRANTY; without even the implied warranty of
16 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
17 GNU General Public License for more details.
19 You should have received a copy of the GNU General Public License
20 along with this program. If not, see <http://www.gnu.org/licenses/>. */
23 #include "arch-utils.h"
24 #include "gdb_string.h"
28 #ifdef HAVE_SYS_FILE_H
29 #include <sys/file.h> /* needed for F_OK and friends */
31 #include "frame.h" /* required by inferior.h */
38 #include "gdbthread.h"
43 #include "readline/readline.h"
44 #include "gdb_assert.h"
45 #include "exceptions.h"
47 #include "filenames.h"
48 #include "progspace.h"
57 /* List of all available core_fns. On gdb startup, each core file
58 register reader calls deprecated_add_core_fns() to register
59 information on each core format it is prepared to read. */
61 static struct core_fns
*core_file_fns
= NULL
;
63 /* The core_fns for a core file handler that is prepared to read the
64 core file currently open on core_bfd. */
66 static struct core_fns
*core_vec
= NULL
;
68 /* FIXME: kettenis/20031023: Eventually this variable should
71 struct gdbarch
*core_gdbarch
= NULL
;
73 /* Per-core data. Currently, only the section table. Note that these
74 target sections are *not* mapped in the current address spaces' set
75 of target sections --- those should come only from pure executable
76 or shared library bfds. The core bfd sections are an
77 implementation detail of the core target, just like ptrace is for
78 unix child targets. */
79 static struct target_section_table
*core_data
;
81 /* True if we needed to fake the pid of the loaded core inferior. */
82 static int core_has_fake_pid
= 0;
84 static void core_files_info (struct target_ops
*);
86 static struct core_fns
*sniff_core_bfd (bfd
*);
88 static int gdb_check_format (bfd
*);
90 static void core_open (char *, int);
92 static void core_detach (struct target_ops
*ops
, char *, int);
94 static void core_close (int);
96 static void core_close_cleanup (void *ignore
);
98 static void add_to_thread_list (bfd
*, asection
*, void *);
100 static void init_core_ops (void);
102 void _initialize_corelow (void);
104 static struct target_ops core_ops
;
106 /* An arbitrary identifier for the core inferior. */
107 #define CORELOW_PID 1
109 /* Link a new core_fns into the global core_file_fns list. Called on
110 gdb startup by the _initialize routine in each core file register
111 reader, to register information about each format the reader is
112 prepared to handle. */
115 deprecated_add_core_fns (struct core_fns
*cf
)
117 cf
->next
= core_file_fns
;
121 /* The default function that core file handlers can use to examine a
122 core file BFD and decide whether or not to accept the job of
123 reading the core file. */
126 default_core_sniffer (struct core_fns
*our_fns
, bfd
*abfd
)
130 result
= (bfd_get_flavour (abfd
) == our_fns
-> core_flavour
);
134 /* Walk through the list of core functions to find a set that can
135 handle the core file open on ABFD. Default to the first one in the
136 list if nothing matches. Returns pointer to set that is
139 static struct core_fns
*
140 sniff_core_bfd (bfd
*abfd
)
143 struct core_fns
*yummy
= NULL
;
146 /* Don't sniff if we have support for register sets in
148 if (core_gdbarch
&& gdbarch_regset_from_core_section_p (core_gdbarch
))
151 for (cf
= core_file_fns
; cf
!= NULL
; cf
= cf
->next
)
153 if (cf
->core_sniffer (cf
, abfd
))
161 warning (_("\"%s\": ambiguous core format, %d handlers match"),
162 bfd_get_filename (abfd
), matches
);
164 else if (matches
== 0)
166 warning (_("\"%s\": no core file handler "
167 "recognizes format, using default"),
168 bfd_get_filename (abfd
));
172 yummy
= core_file_fns
;
177 /* The default is to reject every core file format we see. Either
178 BFD has to recognize it, or we have to provide a function in the
179 core file handler that recognizes it. */
182 default_check_format (bfd
*abfd
)
187 /* Attempt to recognize core file formats that BFD rejects. */
190 gdb_check_format (bfd
*abfd
)
194 for (cf
= core_file_fns
; cf
!= NULL
; cf
= cf
->next
)
196 if (cf
->check_format (abfd
))
204 /* Discard all vestiges of any previous core file and mark data and
205 stack spaces as empty. */
208 core_close (int quitting
)
214 int pid
= ptid_get_pid (inferior_ptid
);
215 inferior_ptid
= null_ptid
; /* Avoid confusion from thread
217 exit_inferior_silent (pid
);
219 /* Clear out solib state while the bfd is still open. See
220 comments in clear_solib in solib.c. */
223 xfree (core_data
->sections
);
226 core_has_fake_pid
= 0;
228 name
= bfd_get_filename (core_bfd
);
229 gdb_bfd_close_or_warn (core_bfd
);
238 core_close_cleanup (void *ignore
)
240 core_close (0/*ignored*/);
243 /* Look for sections whose names start with `.reg/' so that we can
244 extract the list of threads in a core file. */
247 add_to_thread_list (bfd
*abfd
, asection
*asect
, void *reg_sect_arg
)
252 asection
*reg_sect
= (asection
*) reg_sect_arg
;
254 if (strncmp (bfd_section_name (abfd
, asect
), ".reg/", 5) != 0)
257 core_tid
= atoi (bfd_section_name (abfd
, asect
) + 5);
259 pid
= bfd_core_file_pid (core_bfd
);
262 core_has_fake_pid
= 1;
268 if (current_inferior ()->pid
== 0)
269 inferior_appeared (current_inferior (), pid
);
271 ptid
= ptid_build (pid
, lwpid
, 0);
275 /* Warning, Will Robinson, looking at BFD private data! */
278 && asect
->filepos
== reg_sect
->filepos
) /* Did we find .reg? */
279 inferior_ptid
= ptid
; /* Yes, make it current. */
282 /* This routine opens and sets up the core file bfd. */
285 core_open (char *filename
, int from_tty
)
289 struct cleanup
*old_chain
;
295 target_preopen (from_tty
);
299 error (_("No core file specified. (Use `detach' "
300 "to stop debugging a core file.)"));
302 error (_("No core file specified."));
305 filename
= tilde_expand (filename
);
306 if (!IS_ABSOLUTE_PATH (filename
))
308 temp
= concat (current_directory
, "/",
309 filename
, (char *) NULL
);
314 old_chain
= make_cleanup (xfree
, filename
);
316 flags
= O_BINARY
| O_LARGEFILE
;
321 scratch_chan
= open (filename
, flags
, 0);
322 if (scratch_chan
< 0)
323 perror_with_name (filename
);
325 temp_bfd
= bfd_fopen (filename
, gnutarget
,
326 write_files
? FOPEN_RUB
: FOPEN_RB
,
328 if (temp_bfd
== NULL
)
329 perror_with_name (filename
);
331 if (!bfd_check_format (temp_bfd
, bfd_core
)
332 && !gdb_check_format (temp_bfd
))
334 /* Do it after the err msg */
335 /* FIXME: should be checking for errors from bfd_close (for one
336 thing, on error it does not free all the storage associated
338 make_cleanup_bfd_close (temp_bfd
);
339 error (_("\"%s\" is not a core dump: %s"),
340 filename
, bfd_errmsg (bfd_get_error ()));
343 /* Looks semi-reasonable. Toss the old core file and work on the
346 discard_cleanups (old_chain
); /* Don't free filename any more */
347 unpush_target (&core_ops
);
349 old_chain
= make_cleanup (core_close_cleanup
, 0 /*ignore*/);
351 /* FIXME: kettenis/20031023: This is very dangerous. The
352 CORE_GDBARCH that results from this call may very well be
353 different from CURRENT_GDBARCH. However, its methods may only
354 work if it is selected as the current architecture, because they
355 rely on swapped data (see gdbarch.c). We should get rid of that
357 core_gdbarch
= gdbarch_from_bfd (core_bfd
);
359 /* Find a suitable core file handler to munch on core_bfd */
360 core_vec
= sniff_core_bfd (core_bfd
);
364 core_data
= XZALLOC (struct target_section_table
);
366 /* Find the data section */
367 if (build_section_table (core_bfd
,
368 &core_data
->sections
,
369 &core_data
->sections_end
))
370 error (_("\"%s\": Can't find sections: %s"),
371 bfd_get_filename (core_bfd
), bfd_errmsg (bfd_get_error ()));
373 /* If we have no exec file, try to set the architecture from the
374 core file. We don't do this unconditionally since an exec file
375 typically contains more information that helps us determine the
376 architecture than a core file. */
378 set_gdbarch_from_file (core_bfd
);
380 push_target (&core_ops
);
381 discard_cleanups (old_chain
);
383 /* Do this before acknowledging the inferior, so if
384 post_create_inferior throws (can happen easilly if you're loading
385 a core file with the wrong exec), we aren't left with threads
386 from the previous inferior. */
389 inferior_ptid
= null_ptid
;
390 core_has_fake_pid
= 0;
392 /* Need to flush the register cache (and the frame cache) from a
393 previous debug session. If inferior_ptid ends up the same as the
394 last debug session --- e.g., b foo; run; gcore core1; step; gcore
395 core2; core core1; core core2 --- then there's potential for
396 get_current_regcache to return the cached regcache of the
397 previous session, and the frame cache being stale. */
398 registers_changed ();
400 /* Build up thread list from BFD sections, and possibly set the
401 current thread to the .reg/NN section matching the .reg
403 bfd_map_over_sections (core_bfd
, add_to_thread_list
,
404 bfd_get_section_by_name (core_bfd
, ".reg"));
406 if (ptid_equal (inferior_ptid
, null_ptid
))
408 /* Either we found no .reg/NN section, and hence we have a
409 non-threaded core (single-threaded, from gdb's perspective),
410 or for some reason add_to_thread_list couldn't determine
411 which was the "main" thread. The latter case shouldn't
412 usually happen, but we're dealing with input here, which can
413 always be broken in different ways. */
414 struct thread_info
*thread
= first_thread_of_process (-1);
418 inferior_appeared (current_inferior (), CORELOW_PID
);
419 inferior_ptid
= pid_to_ptid (CORELOW_PID
);
420 add_thread_silent (inferior_ptid
);
423 switch_to_thread (thread
->ptid
);
426 post_create_inferior (&core_ops
, from_tty
);
428 /* Now go through the target stack looking for threads since there
429 may be a thread_stratum target loaded on top of target core by
430 now. The layer above should claim threads found in the BFD
432 gdb_target_find_new_threads ();
434 p
= bfd_core_file_failing_command (core_bfd
);
436 printf_filtered (_("Core was generated by `%s'.\n"), p
);
438 siggy
= bfd_core_file_failing_signal (core_bfd
);
441 /* NOTE: target_signal_from_host() converts a target signal
442 value into gdb's internal signal value. Unfortunately gdb's
443 internal value is called ``target_signal'' and this function
444 got the name ..._from_host(). */
445 enum target_signal sig
= (core_gdbarch
!= NULL
446 ? gdbarch_target_signal_from_host (core_gdbarch
,
448 : target_signal_from_host (siggy
));
450 printf_filtered (_("Program terminated with signal %d, %s.\n"),
451 siggy
, target_signal_to_string (sig
));
454 /* Fetch all registers from core file. */
455 target_fetch_registers (get_current_regcache (), -1);
457 /* Now, set up the frame cache, and print the top of stack. */
458 reinit_frame_cache ();
459 print_stack_frame (get_selected_frame (NULL
), 1, SRC_AND_LOC
);
463 core_detach (struct target_ops
*ops
, char *args
, int from_tty
)
466 error (_("Too many arguments"));
468 reinit_frame_cache ();
470 printf_filtered (_("No core file now.\n"));
473 #ifdef DEPRECATED_IBM6000_TARGET
475 /* Resize the core memory's section table, by NUM_ADDED. Returns a
476 pointer into the first new slot. This will not be necessary when
477 the rs6000 target is converted to use the standard solib
480 struct target_section
*
481 deprecated_core_resize_section_table (int num_added
)
485 old_count
= resize_section_table (core_data
, num_added
);
486 return core_data
->sections
+ old_count
;
491 /* Try to retrieve registers from a section in core_bfd, and supply
492 them to core_vec->core_read_registers, as the register set numbered
495 If inferior_ptid's lwp member is zero, do the single-threaded
496 thing: look for a section named NAME. If inferior_ptid's lwp
497 member is non-zero, do the multi-threaded thing: look for a section
498 named "NAME/LWP", where LWP is the shortest ASCII decimal
499 representation of inferior_ptid's lwp member.
501 HUMAN_NAME is a human-readable name for the kind of registers the
502 NAME section contains, for use in error messages.
504 If REQUIRED is non-zero, print an error if the core file doesn't
505 have a section by the appropriate name. Otherwise, just do
509 get_core_register_section (struct regcache
*regcache
,
512 const char *human_name
,
515 static char *section_name
= NULL
;
516 struct bfd_section
*section
;
520 xfree (section_name
);
522 if (ptid_get_lwp (inferior_ptid
))
523 section_name
= xstrprintf ("%s/%ld", name
,
524 ptid_get_lwp (inferior_ptid
));
526 section_name
= xstrdup (name
);
528 section
= bfd_get_section_by_name (core_bfd
, section_name
);
532 warning (_("Couldn't find %s registers in core file."),
537 size
= bfd_section_size (core_bfd
, section
);
538 contents
= alloca (size
);
539 if (! bfd_get_section_contents (core_bfd
, section
, contents
,
542 warning (_("Couldn't read %s registers from `%s' section in core file."),
547 if (core_gdbarch
&& gdbarch_regset_from_core_section_p (core_gdbarch
))
549 const struct regset
*regset
;
551 regset
= gdbarch_regset_from_core_section (core_gdbarch
,
556 warning (_("Couldn't recognize %s registers in core file."),
561 regset
->supply_regset (regset
, regcache
, -1, contents
, size
);
565 gdb_assert (core_vec
);
566 core_vec
->core_read_registers (regcache
, contents
, size
, which
,
568 bfd_section_vma (core_bfd
, section
)));
572 /* Get the registers out of a core file. This is the machine-
573 independent part. Fetch_core_registers is the machine-dependent
574 part, typically implemented in the xm-file for each
577 /* We just get all the registers, so we don't use regno. */
580 get_core_registers (struct target_ops
*ops
,
581 struct regcache
*regcache
, int regno
)
583 struct core_regset_section
*sect_list
;
586 if (!(core_gdbarch
&& gdbarch_regset_from_core_section_p (core_gdbarch
))
587 && (core_vec
== NULL
|| core_vec
->core_read_registers
== NULL
))
589 fprintf_filtered (gdb_stderr
,
590 "Can't fetch registers from this type of core file\n");
594 sect_list
= gdbarch_core_regset_sections (get_regcache_arch (regcache
));
596 while (sect_list
->sect_name
!= NULL
)
598 if (strcmp (sect_list
->sect_name
, ".reg") == 0)
599 get_core_register_section (regcache
, sect_list
->sect_name
,
600 0, sect_list
->human_name
, 1);
601 else if (strcmp (sect_list
->sect_name
, ".reg2") == 0)
602 get_core_register_section (regcache
, sect_list
->sect_name
,
603 2, sect_list
->human_name
, 0);
605 get_core_register_section (regcache
, sect_list
->sect_name
,
606 3, sect_list
->human_name
, 0);
613 get_core_register_section (regcache
,
614 ".reg", 0, "general-purpose", 1);
615 get_core_register_section (regcache
,
616 ".reg2", 2, "floating-point", 0);
619 /* Mark all registers not found in the core as unavailable. */
620 for (i
= 0; i
< gdbarch_num_regs (get_regcache_arch (regcache
)); i
++)
621 if (regcache_register_status (regcache
, i
) == REG_UNKNOWN
)
622 regcache_raw_supply (regcache
, i
, NULL
);
626 core_files_info (struct target_ops
*t
)
628 print_section_info (core_data
, core_bfd
);
641 add_to_spuid_list (bfd
*abfd
, asection
*asect
, void *list_p
)
643 struct spuid_list
*list
= list_p
;
644 enum bfd_endian byte_order
645 = bfd_big_endian (abfd
) ? BFD_ENDIAN_BIG
: BFD_ENDIAN_LITTLE
;
648 sscanf (bfd_section_name (abfd
, asect
), "SPU/%d/regs%n", &fd
, &pos
);
652 if (list
->pos
>= list
->offset
&& list
->pos
+ 4 <= list
->offset
+ list
->len
)
654 store_unsigned_integer (list
->buf
+ list
->pos
- list
->offset
,
662 core_xfer_partial (struct target_ops
*ops
, enum target_object object
,
663 const char *annex
, gdb_byte
*readbuf
,
664 const gdb_byte
*writebuf
, ULONGEST offset
,
669 case TARGET_OBJECT_MEMORY
:
670 return section_table_xfer_memory_partial (readbuf
, writebuf
,
673 core_data
->sections_end
,
676 case TARGET_OBJECT_AUXV
:
679 /* When the aux vector is stored in core file, BFD
680 represents this with a fake section called ".auxv". */
682 struct bfd_section
*section
;
685 section
= bfd_get_section_by_name (core_bfd
, ".auxv");
689 size
= bfd_section_size (core_bfd
, section
);
696 && !bfd_get_section_contents (core_bfd
, section
, readbuf
,
697 (file_ptr
) offset
, size
))
699 warning (_("Couldn't read NT_AUXV note in core file."));
707 case TARGET_OBJECT_WCOOKIE
:
710 /* When the StackGhost cookie is stored in core file, BFD
711 represents this with a fake section called
714 struct bfd_section
*section
;
717 section
= bfd_get_section_by_name (core_bfd
, ".wcookie");
721 size
= bfd_section_size (core_bfd
, section
);
728 && !bfd_get_section_contents (core_bfd
, section
, readbuf
,
729 (file_ptr
) offset
, size
))
731 warning (_("Couldn't read StackGhost cookie in core file."));
739 case TARGET_OBJECT_LIBRARIES
:
741 && gdbarch_core_xfer_shared_libraries_p (core_gdbarch
))
746 gdbarch_core_xfer_shared_libraries (core_gdbarch
,
747 readbuf
, offset
, len
);
751 case TARGET_OBJECT_SPU
:
752 if (readbuf
&& annex
)
754 /* When the SPU contexts are stored in a core file, BFD
755 represents this with a fake section called
758 struct bfd_section
*section
;
760 char sectionstr
[100];
762 xsnprintf (sectionstr
, sizeof sectionstr
, "SPU/%s", annex
);
764 section
= bfd_get_section_by_name (core_bfd
, sectionstr
);
768 size
= bfd_section_size (core_bfd
, section
);
775 && !bfd_get_section_contents (core_bfd
, section
, readbuf
,
776 (file_ptr
) offset
, size
))
778 warning (_("Couldn't read SPU section in core file."));
786 /* NULL annex requests list of all present spuids. */
787 struct spuid_list list
;
790 list
.offset
= offset
;
794 bfd_map_over_sections (core_bfd
, add_to_spuid_list
, &list
);
800 if (ops
->beneath
!= NULL
)
801 return ops
->beneath
->to_xfer_partial (ops
->beneath
, object
,
803 writebuf
, offset
, len
);
809 /* If mourn is being called in all the right places, this could be say
810 `gdb internal error' (since generic_mourn calls
811 breakpoint_init_inferior). */
814 ignore (struct gdbarch
*gdbarch
, struct bp_target_info
*bp_tgt
)
820 /* Okay, let's be honest: threads gleaned from a core file aren't
821 exactly lively, are they? On the other hand, if we don't claim
822 that each & every one is alive, then we don't get any of them
823 to appear in an "info thread" command, which is quite a useful
827 core_thread_alive (struct target_ops
*ops
, ptid_t ptid
)
832 /* Ask the current architecture what it knows about this core file.
833 That will be used, in turn, to pick a better architecture. This
834 wrapper could be avoided if targets got a chance to specialize
837 static const struct target_desc
*
838 core_read_description (struct target_ops
*target
)
840 if (core_gdbarch
&& gdbarch_core_read_description_p (core_gdbarch
))
841 return gdbarch_core_read_description (core_gdbarch
,
848 core_pid_to_str (struct target_ops
*ops
, ptid_t ptid
)
853 /* The preferred way is to have a gdbarch/OS specific
856 && gdbarch_core_pid_to_str_p (core_gdbarch
))
857 return gdbarch_core_pid_to_str (core_gdbarch
, ptid
);
859 /* Otherwise, if we don't have one, we'll just fallback to
860 "process", with normal_pid_to_str. */
862 /* Try the LWPID field first. */
863 pid
= ptid_get_lwp (ptid
);
865 return normal_pid_to_str (pid_to_ptid (pid
));
867 /* Otherwise, this isn't a "threaded" core -- use the PID field, but
868 only if it isn't a fake PID. */
869 if (!core_has_fake_pid
)
870 return normal_pid_to_str (ptid
);
872 /* No luck. We simply don't have a valid PID to print. */
873 xsnprintf (buf
, sizeof buf
, "<main task>");
878 core_has_memory (struct target_ops
*ops
)
880 return (core_bfd
!= NULL
);
884 core_has_stack (struct target_ops
*ops
)
886 return (core_bfd
!= NULL
);
890 core_has_registers (struct target_ops
*ops
)
892 return (core_bfd
!= NULL
);
895 /* Fill in core_ops with its defined operations and properties. */
900 core_ops
.to_shortname
= "core";
901 core_ops
.to_longname
= "Local core dump file";
903 "Use a core file as a target. Specify the filename of the core file.";
904 core_ops
.to_open
= core_open
;
905 core_ops
.to_close
= core_close
;
906 core_ops
.to_attach
= find_default_attach
;
907 core_ops
.to_detach
= core_detach
;
908 core_ops
.to_fetch_registers
= get_core_registers
;
909 core_ops
.to_xfer_partial
= core_xfer_partial
;
910 core_ops
.to_files_info
= core_files_info
;
911 core_ops
.to_insert_breakpoint
= ignore
;
912 core_ops
.to_remove_breakpoint
= ignore
;
913 core_ops
.to_create_inferior
= find_default_create_inferior
;
914 core_ops
.to_thread_alive
= core_thread_alive
;
915 core_ops
.to_read_description
= core_read_description
;
916 core_ops
.to_pid_to_str
= core_pid_to_str
;
917 core_ops
.to_stratum
= process_stratum
;
918 core_ops
.to_has_memory
= core_has_memory
;
919 core_ops
.to_has_stack
= core_has_stack
;
920 core_ops
.to_has_registers
= core_has_registers
;
921 core_ops
.to_magic
= OPS_MAGIC
;
924 internal_error (__FILE__
, __LINE__
,
925 _("init_core_ops: core target already exists (\"%s\")."),
926 core_target
->to_longname
);
927 core_target
= &core_ops
;
931 _initialize_corelow (void)
935 add_target (&core_ops
);