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
5 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"
55 /* List of all available core_fns. On gdb startup, each core file
56 register reader calls deprecated_add_core_fns() to register
57 information on each core format it is prepared to read. */
59 static struct core_fns
*core_file_fns
= NULL
;
61 /* The core_fns for a core file handler that is prepared to read the core
62 file currently open on core_bfd. */
64 static struct core_fns
*core_vec
= NULL
;
66 /* FIXME: kettenis/20031023: Eventually this variable should
69 struct gdbarch
*core_gdbarch
= NULL
;
71 /* Per-core data. Currently, only the section table. Note that these
72 target sections are *not* mapped in the current address spaces' set
73 of target sections --- those should come only from pure executable
74 or shared library bfds. The core bfd sections are an
75 implementation detail of the core target, just like ptrace is for
76 unix child targets. */
77 static struct target_section_table
*core_data
;
79 /* True if we needed to fake the pid of the loaded core inferior. */
80 static int core_has_fake_pid
= 0;
82 static void core_files_info (struct target_ops
*);
84 static struct core_fns
*sniff_core_bfd (bfd
*);
86 static int gdb_check_format (bfd
*);
88 static void core_open (char *, int);
90 static void core_detach (struct target_ops
*ops
, char *, int);
92 static void core_close (int);
94 static void core_close_cleanup (void *ignore
);
96 static void add_to_thread_list (bfd
*, asection
*, void *);
98 static void init_core_ops (void);
100 void _initialize_corelow (void);
102 struct target_ops core_ops
;
104 /* An arbitrary identifier for the core inferior. */
105 #define CORELOW_PID 1
107 /* Link a new core_fns into the global core_file_fns list. Called on gdb
108 startup by the _initialize routine in each core file register reader, to
109 register information about each format the the reader is prepared to
113 deprecated_add_core_fns (struct core_fns
*cf
)
115 cf
->next
= core_file_fns
;
119 /* The default function that core file handlers can use to examine a
120 core file BFD and decide whether or not to accept the job of
121 reading the core file. */
124 default_core_sniffer (struct core_fns
*our_fns
, bfd
*abfd
)
128 result
= (bfd_get_flavour (abfd
) == our_fns
-> core_flavour
);
132 /* Walk through the list of core functions to find a set that can
133 handle the core file open on ABFD. Default to the first one in the
134 list if nothing matches. Returns pointer to set that is
137 static struct core_fns
*
138 sniff_core_bfd (bfd
*abfd
)
141 struct core_fns
*yummy
= NULL
;
144 /* Don't sniff if we have support for register sets in CORE_GDBARCH. */
145 if (core_gdbarch
&& gdbarch_regset_from_core_section_p (core_gdbarch
))
148 for (cf
= core_file_fns
; cf
!= NULL
; cf
= cf
->next
)
150 if (cf
->core_sniffer (cf
, abfd
))
158 warning (_("\"%s\": ambiguous core format, %d handlers match"),
159 bfd_get_filename (abfd
), matches
);
161 else if (matches
== 0)
163 warning (_("\"%s\": no core file handler recognizes format, using default"),
164 bfd_get_filename (abfd
));
168 yummy
= core_file_fns
;
173 /* The default is to reject every core file format we see. Either
174 BFD has to recognize it, or we have to provide a function in the
175 core file handler that recognizes it. */
178 default_check_format (bfd
*abfd
)
183 /* Attempt to recognize core file formats that BFD rejects. */
186 gdb_check_format (bfd
*abfd
)
190 for (cf
= core_file_fns
; cf
!= NULL
; cf
= cf
->next
)
192 if (cf
->check_format (abfd
))
200 /* Discard all vestiges of any previous core file and mark data and stack
204 core_close (int quitting
)
210 int pid
= ptid_get_pid (inferior_ptid
);
211 inferior_ptid
= null_ptid
; /* Avoid confusion from thread stuff */
212 exit_inferior_silent (pid
);
214 /* Clear out solib state while the bfd is still open. See
215 comments in clear_solib in solib.c. */
218 xfree (core_data
->sections
);
221 core_has_fake_pid
= 0;
223 name
= bfd_get_filename (core_bfd
);
224 if (!bfd_close (core_bfd
))
225 warning (_("cannot close \"%s\": %s"),
226 name
, bfd_errmsg (bfd_get_error ()));
235 core_close_cleanup (void *ignore
)
237 core_close (0/*ignored*/);
240 /* Look for sections whose names start with `.reg/' so that we can extract the
241 list of threads in a core file. */
244 add_to_thread_list (bfd
*abfd
, asection
*asect
, void *reg_sect_arg
)
249 asection
*reg_sect
= (asection
*) reg_sect_arg
;
251 if (strncmp (bfd_section_name (abfd
, asect
), ".reg/", 5) != 0)
254 core_tid
= atoi (bfd_section_name (abfd
, asect
) + 5);
257 && gdbarch_core_reg_section_encodes_pid (core_gdbarch
))
259 uint32_t merged_pid
= core_tid
;
260 pid
= merged_pid
& 0xffff;
261 lwpid
= merged_pid
>> 16;
263 /* This can happen on solaris core, for example, if we don't
264 find a NT_PSTATUS note in the core, but do find NT_LWPSTATUS
268 core_has_fake_pid
= 1;
274 core_has_fake_pid
= 1;
279 if (current_inferior ()->pid
== 0)
280 inferior_appeared (current_inferior (), pid
);
282 ptid
= ptid_build (pid
, lwpid
, 0);
286 /* Warning, Will Robinson, looking at BFD private data! */
289 && asect
->filepos
== reg_sect
->filepos
) /* Did we find .reg? */
290 inferior_ptid
= ptid
; /* Yes, make it current */
293 /* This routine opens and sets up the core file bfd. */
296 core_open (char *filename
, int from_tty
)
300 struct cleanup
*old_chain
;
305 int corelow_pid
= CORELOW_PID
;
306 struct inferior
*inf
;
308 target_preopen (from_tty
);
312 error (_("No core file specified. (Use `detach' to stop debugging a core file.)"));
314 error (_("No core file specified."));
317 filename
= tilde_expand (filename
);
318 if (!IS_ABSOLUTE_PATH(filename
))
320 temp
= concat (current_directory
, "/", filename
, (char *)NULL
);
325 old_chain
= make_cleanup (xfree
, filename
);
327 flags
= O_BINARY
| O_LARGEFILE
;
332 scratch_chan
= open (filename
, flags
, 0);
333 if (scratch_chan
< 0)
334 perror_with_name (filename
);
336 temp_bfd
= bfd_fopen (filename
, gnutarget
,
337 write_files
? FOPEN_RUB
: FOPEN_RB
,
339 if (temp_bfd
== NULL
)
340 perror_with_name (filename
);
342 if (!bfd_check_format (temp_bfd
, bfd_core
)
343 && !gdb_check_format (temp_bfd
))
345 /* Do it after the err msg */
346 /* FIXME: should be checking for errors from bfd_close (for one thing,
347 on error it does not free all the storage associated with the
349 make_cleanup_bfd_close (temp_bfd
);
350 error (_("\"%s\" is not a core dump: %s"),
351 filename
, bfd_errmsg (bfd_get_error ()));
354 /* Looks semi-reasonable. Toss the old core file and work on the new. */
356 discard_cleanups (old_chain
); /* Don't free filename any more */
357 unpush_target (&core_ops
);
359 old_chain
= make_cleanup (core_close_cleanup
, 0 /*ignore*/);
361 /* FIXME: kettenis/20031023: This is very dangerous. The
362 CORE_GDBARCH that results from this call may very well be
363 different from CURRENT_GDBARCH. However, its methods may only
364 work if it is selected as the current architecture, because they
365 rely on swapped data (see gdbarch.c). We should get rid of that
367 core_gdbarch
= gdbarch_from_bfd (core_bfd
);
369 /* Find a suitable core file handler to munch on core_bfd */
370 core_vec
= sniff_core_bfd (core_bfd
);
374 core_data
= XZALLOC (struct target_section_table
);
376 /* Find the data section */
377 if (build_section_table (core_bfd
,
378 &core_data
->sections
, &core_data
->sections_end
))
379 error (_("\"%s\": Can't find sections: %s"),
380 bfd_get_filename (core_bfd
), bfd_errmsg (bfd_get_error ()));
382 /* If we have no exec file, try to set the architecture from the
383 core file. We don't do this unconditionally since an exec file
384 typically contains more information that helps us determine the
385 architecture than a core file. */
387 set_gdbarch_from_file (core_bfd
);
389 push_target (&core_ops
);
390 discard_cleanups (old_chain
);
392 /* Do this before acknowledging the inferior, so if
393 post_create_inferior throws (can happen easilly if you're loading
394 a core file with the wrong exec), we aren't left with threads
395 from the previous inferior. */
398 inferior_ptid
= null_ptid
;
399 core_has_fake_pid
= 0;
401 /* Need to flush the register cache (and the frame cache) from a
402 previous debug session. If inferior_ptid ends up the same as the
403 last debug session --- e.g., b foo; run; gcore core1; step; gcore
404 core2; core core1; core core2 --- then there's potential for
405 get_current_regcache to return the cached regcache of the
406 previous session, and the frame cache being stale. */
407 registers_changed ();
409 /* Build up thread list from BFD sections, and possibly set the
410 current thread to the .reg/NN section matching the .reg
412 bfd_map_over_sections (core_bfd
, add_to_thread_list
,
413 bfd_get_section_by_name (core_bfd
, ".reg"));
415 if (ptid_equal (inferior_ptid
, null_ptid
))
417 /* Either we found no .reg/NN section, and hence we have a
418 non-threaded core (single-threaded, from gdb's perspective),
419 or for some reason add_to_thread_list couldn't determine
420 which was the "main" thread. The latter case shouldn't
421 usually happen, but we're dealing with input here, which can
422 always be broken in different ways. */
423 struct thread_info
*thread
= first_thread_of_process (-1);
426 add_inferior_silent (CORELOW_PID
);
427 inferior_ptid
= pid_to_ptid (CORELOW_PID
);
428 add_thread_silent (inferior_ptid
);
431 switch_to_thread (thread
->ptid
);
434 post_create_inferior (&core_ops
, from_tty
);
436 /* Now go through the target stack looking for threads since there
437 may be a thread_stratum target loaded on top of target core by
438 now. The layer above should claim threads found in the BFD
440 target_find_new_threads ();
442 p
= bfd_core_file_failing_command (core_bfd
);
444 printf_filtered (_("Core was generated by `%s'.\n"), p
);
446 siggy
= bfd_core_file_failing_signal (core_bfd
);
448 /* NOTE: target_signal_from_host() converts a target signal value
449 into gdb's internal signal value. Unfortunately gdb's internal
450 value is called ``target_signal'' and this function got the
451 name ..._from_host(). */
452 printf_filtered (_("Program terminated with signal %d, %s.\n"), siggy
,
453 target_signal_to_string (
454 (core_gdbarch
!= NULL
) ?
455 gdbarch_target_signal_from_host (core_gdbarch
, siggy
)
458 /* Fetch all registers from core file. */
459 target_fetch_registers (get_current_regcache (), -1);
461 /* Now, set up the frame cache, and print the top of stack. */
462 reinit_frame_cache ();
463 print_stack_frame (get_selected_frame (NULL
), 1, SRC_AND_LOC
);
467 core_detach (struct target_ops
*ops
, char *args
, int from_tty
)
470 error (_("Too many arguments"));
472 reinit_frame_cache ();
474 printf_filtered (_("No core file now.\n"));
477 #ifdef DEPRECATED_IBM6000_TARGET
479 /* Resize the core memory's section table, by NUM_ADDED. Returns a
480 pointer into the first new slot. This will not be necessary when
481 the rs6000 target is converted to use the standard solib
484 struct target_section
*
485 deprecated_core_resize_section_table (int num_added
)
489 old_count
= resize_section_table (core_data
, num_added
);
490 return core_data
->sections
+ old_count
;
495 /* Try to retrieve registers from a section in core_bfd, and supply
496 them to core_vec->core_read_registers, as the register set numbered
499 If inferior_ptid's lwp member is zero, do the single-threaded
500 thing: look for a section named NAME. If inferior_ptid's lwp
501 member is non-zero, do the multi-threaded thing: look for a section
502 named "NAME/LWP", where LWP is the shortest ASCII decimal
503 representation of inferior_ptid's lwp member.
505 HUMAN_NAME is a human-readable name for the kind of registers the
506 NAME section contains, for use in error messages.
508 If REQUIRED is non-zero, print an error if the core file doesn't
509 have a section by the appropriate name. Otherwise, just do nothing. */
512 get_core_register_section (struct regcache
*regcache
,
518 static char *section_name
= NULL
;
519 struct bfd_section
*section
;
523 xfree (section_name
);
526 && gdbarch_core_reg_section_encodes_pid (core_gdbarch
))
529 int pid
= ptid_get_pid (inferior_ptid
);
531 if (core_has_fake_pid
)
534 merged_pid
= ptid_get_lwp (inferior_ptid
);
535 merged_pid
= merged_pid
<< 16 | pid
;
537 section_name
= xstrprintf ("%s/%s", name
, plongest (merged_pid
));
539 else if (ptid_get_lwp (inferior_ptid
))
540 section_name
= xstrprintf ("%s/%ld", name
, ptid_get_lwp (inferior_ptid
));
542 section_name
= xstrdup (name
);
544 section
= bfd_get_section_by_name (core_bfd
, section_name
);
548 warning (_("Couldn't find %s registers in core file."), human_name
);
552 size
= bfd_section_size (core_bfd
, section
);
553 contents
= alloca (size
);
554 if (! bfd_get_section_contents (core_bfd
, section
, contents
,
557 warning (_("Couldn't read %s registers from `%s' section in core file."),
562 if (core_gdbarch
&& gdbarch_regset_from_core_section_p (core_gdbarch
))
564 const struct regset
*regset
;
566 regset
= gdbarch_regset_from_core_section (core_gdbarch
, name
, size
);
570 warning (_("Couldn't recognize %s registers in core file."),
575 regset
->supply_regset (regset
, regcache
, -1, contents
, size
);
579 gdb_assert (core_vec
);
580 core_vec
->core_read_registers (regcache
, contents
, size
, which
,
582 bfd_section_vma (core_bfd
, section
)));
586 /* Get the registers out of a core file. This is the machine-
587 independent part. Fetch_core_registers is the machine-dependent
588 part, typically implemented in the xm-file for each architecture. */
590 /* We just get all the registers, so we don't use regno. */
593 get_core_registers (struct target_ops
*ops
,
594 struct regcache
*regcache
, int regno
)
598 if (!(core_gdbarch
&& gdbarch_regset_from_core_section_p (core_gdbarch
))
599 && (core_vec
== NULL
|| core_vec
->core_read_registers
== NULL
))
601 fprintf_filtered (gdb_stderr
,
602 "Can't fetch registers from this type of core file\n");
606 get_core_register_section (regcache
,
607 ".reg", 0, "general-purpose", 1);
608 get_core_register_section (regcache
,
609 ".reg2", 2, "floating-point", 0);
610 get_core_register_section (regcache
,
611 ".reg-xfp", 3, "extended floating-point", 0);
612 get_core_register_section (regcache
,
613 ".reg-ppc-vmx", 3, "ppc Altivec", 0);
614 get_core_register_section (regcache
,
615 ".reg-ppc-vsx", 4, "POWER7 VSX", 0);
617 /* Supply dummy value for all registers not found in the core. */
618 for (i
= 0; i
< gdbarch_num_regs (get_regcache_arch (regcache
)); i
++)
619 if (!regcache_valid_p (regcache
, i
))
620 regcache_raw_supply (regcache
, i
, NULL
);
624 core_files_info (struct target_ops
*t
)
626 print_section_info (core_data
, core_bfd
);
639 add_to_spuid_list (bfd
*abfd
, asection
*asect
, void *list_p
)
641 struct spuid_list
*list
= list_p
;
642 enum bfd_endian byte_order
643 = bfd_big_endian (abfd
)? BFD_ENDIAN_BIG
: BFD_ENDIAN_LITTLE
;
646 sscanf (bfd_section_name (abfd
, asect
), "SPU/%d/regs%n", &fd
, &pos
);
650 if (list
->pos
>= list
->offset
&& list
->pos
+ 4 <= list
->offset
+ list
->len
)
652 store_unsigned_integer (list
->buf
+ list
->pos
- list
->offset
,
660 core_xfer_partial (struct target_ops
*ops
, enum target_object object
,
661 const char *annex
, gdb_byte
*readbuf
,
662 const gdb_byte
*writebuf
, ULONGEST offset
, LONGEST len
)
666 case TARGET_OBJECT_MEMORY
:
667 return section_table_xfer_memory_partial (readbuf
, writebuf
,
670 core_data
->sections_end
,
673 case TARGET_OBJECT_AUXV
:
676 /* When the aux vector is stored in core file, BFD
677 represents this with a fake section called ".auxv". */
679 struct bfd_section
*section
;
683 section
= bfd_get_section_by_name (core_bfd
, ".auxv");
687 size
= bfd_section_size (core_bfd
, section
);
694 && !bfd_get_section_contents (core_bfd
, section
, readbuf
,
695 (file_ptr
) offset
, size
))
697 warning (_("Couldn't read NT_AUXV note in core file."));
705 case TARGET_OBJECT_WCOOKIE
:
708 /* When the StackGhost cookie is stored in core file, BFD
709 represents this with a fake section called ".wcookie". */
711 struct bfd_section
*section
;
715 section
= bfd_get_section_by_name (core_bfd
, ".wcookie");
719 size
= bfd_section_size (core_bfd
, section
);
726 && !bfd_get_section_contents (core_bfd
, section
, readbuf
,
727 (file_ptr
) offset
, size
))
729 warning (_("Couldn't read StackGhost cookie in core file."));
737 case TARGET_OBJECT_LIBRARIES
:
739 && gdbarch_core_xfer_shared_libraries_p (core_gdbarch
))
744 gdbarch_core_xfer_shared_libraries (core_gdbarch
,
745 readbuf
, offset
, len
);
749 case TARGET_OBJECT_SPU
:
750 if (readbuf
&& annex
)
752 /* When the SPU contexts are stored in a core file, BFD
753 represents this with a fake section called "SPU/<annex>". */
755 struct bfd_section
*section
;
759 char sectionstr
[100];
760 xsnprintf (sectionstr
, sizeof sectionstr
, "SPU/%s", annex
);
762 section
= bfd_get_section_by_name (core_bfd
, sectionstr
);
766 size
= bfd_section_size (core_bfd
, section
);
773 && !bfd_get_section_contents (core_bfd
, section
, readbuf
,
774 (file_ptr
) offset
, size
))
776 warning (_("Couldn't read SPU section in core file."));
784 /* NULL annex requests list of all present spuids. */
785 struct spuid_list list
;
787 list
.offset
= offset
;
791 bfd_map_over_sections (core_bfd
, add_to_spuid_list
, &list
);
797 if (ops
->beneath
!= NULL
)
798 return ops
->beneath
->to_xfer_partial (ops
->beneath
, object
, annex
,
799 readbuf
, writebuf
, offset
, len
);
805 /* If mourn is being called in all the right places, this could be say
806 `gdb internal error' (since generic_mourn calls breakpoint_init_inferior). */
809 ignore (struct gdbarch
*gdbarch
, struct bp_target_info
*bp_tgt
)
815 /* Okay, let's be honest: threads gleaned from a core file aren't
816 exactly lively, are they? On the other hand, if we don't claim
817 that each & every one is alive, then we don't get any of them
818 to appear in an "info thread" command, which is quite a useful
822 core_thread_alive (struct target_ops
*ops
, ptid_t ptid
)
827 /* Ask the current architecture what it knows about this core file.
828 That will be used, in turn, to pick a better architecture. This
829 wrapper could be avoided if targets got a chance to specialize
832 static const struct target_desc
*
833 core_read_description (struct target_ops
*target
)
835 if (core_gdbarch
&& gdbarch_core_read_description_p (core_gdbarch
))
836 return gdbarch_core_read_description (core_gdbarch
, target
, core_bfd
);
842 core_pid_to_str (struct target_ops
*ops
, ptid_t ptid
)
847 && gdbarch_core_pid_to_str_p (core_gdbarch
))
849 char *ret
= gdbarch_core_pid_to_str (core_gdbarch
, ptid
);
854 if (ptid_get_lwp (ptid
) == 0)
855 xsnprintf (buf
, sizeof buf
, "<main task>");
857 xsnprintf (buf
, sizeof buf
, "Thread %ld", ptid_get_lwp (ptid
));
863 core_has_memory (struct target_ops
*ops
)
865 return (core_bfd
!= NULL
);
869 core_has_stack (struct target_ops
*ops
)
871 return (core_bfd
!= NULL
);
875 core_has_registers (struct target_ops
*ops
)
877 return (core_bfd
!= NULL
);
880 /* Fill in core_ops with its defined operations and properties. */
885 core_ops
.to_shortname
= "core";
886 core_ops
.to_longname
= "Local core dump file";
888 "Use a core file as a target. Specify the filename of the core file.";
889 core_ops
.to_open
= core_open
;
890 core_ops
.to_close
= core_close
;
891 core_ops
.to_attach
= find_default_attach
;
892 core_ops
.to_detach
= core_detach
;
893 core_ops
.to_fetch_registers
= get_core_registers
;
894 core_ops
.to_xfer_partial
= core_xfer_partial
;
895 core_ops
.to_files_info
= core_files_info
;
896 core_ops
.to_insert_breakpoint
= ignore
;
897 core_ops
.to_remove_breakpoint
= ignore
;
898 core_ops
.to_create_inferior
= find_default_create_inferior
;
899 core_ops
.to_thread_alive
= core_thread_alive
;
900 core_ops
.to_read_description
= core_read_description
;
901 core_ops
.to_pid_to_str
= core_pid_to_str
;
902 core_ops
.to_stratum
= core_stratum
;
903 core_ops
.to_has_memory
= core_has_memory
;
904 core_ops
.to_has_stack
= core_has_stack
;
905 core_ops
.to_has_registers
= core_has_registers
;
906 core_ops
.to_magic
= OPS_MAGIC
;
910 _initialize_corelow (void)
914 add_target (&core_ops
);