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"
54 /* List of all available core_fns. On gdb startup, each core file
55 register reader calls deprecated_add_core_fns() to register
56 information on each core format it is prepared to read. */
58 static struct core_fns
*core_file_fns
= NULL
;
60 /* The core_fns for a core file handler that is prepared to read the core
61 file currently open on core_bfd. */
63 static struct core_fns
*core_vec
= NULL
;
65 /* FIXME: kettenis/20031023: Eventually this variable should
68 struct gdbarch
*core_gdbarch
= NULL
;
70 /* Per-core data. Currently, only the section table. Note that these
71 target sections are *not* mapped in the current address spaces' set
72 of target sections --- those should come only from pure executable
73 or shared library bfds. The core bfd sections are an
74 implementation detail of the core target, just like ptrace is for
75 unix child targets. */
76 static struct target_section_table
*core_data
;
78 static void core_files_info (struct target_ops
*);
80 static struct core_fns
*sniff_core_bfd (bfd
*);
82 static int gdb_check_format (bfd
*);
84 static void core_open (char *, int);
86 static void core_detach (struct target_ops
*ops
, char *, int);
88 static void core_close (int);
90 static void core_close_cleanup (void *ignore
);
92 static void add_to_thread_list (bfd
*, asection
*, void *);
94 static void init_core_ops (void);
96 void _initialize_corelow (void);
98 struct target_ops core_ops
;
100 /* An arbitrary identifier for the core inferior. */
101 #define CORELOW_PID 1
103 /* Link a new core_fns into the global core_file_fns list. Called on gdb
104 startup by the _initialize routine in each core file register reader, to
105 register information about each format the the reader is prepared to
109 deprecated_add_core_fns (struct core_fns
*cf
)
111 cf
->next
= core_file_fns
;
115 /* The default function that core file handlers can use to examine a
116 core file BFD and decide whether or not to accept the job of
117 reading the core file. */
120 default_core_sniffer (struct core_fns
*our_fns
, bfd
*abfd
)
124 result
= (bfd_get_flavour (abfd
) == our_fns
-> core_flavour
);
128 /* Walk through the list of core functions to find a set that can
129 handle the core file open on ABFD. Default to the first one in the
130 list if nothing matches. Returns pointer to set that is
133 static struct core_fns
*
134 sniff_core_bfd (bfd
*abfd
)
137 struct core_fns
*yummy
= NULL
;
140 /* Don't sniff if we have support for register sets in CORE_GDBARCH. */
141 if (core_gdbarch
&& gdbarch_regset_from_core_section_p (core_gdbarch
))
144 for (cf
= core_file_fns
; cf
!= NULL
; cf
= cf
->next
)
146 if (cf
->core_sniffer (cf
, abfd
))
154 warning (_("\"%s\": ambiguous core format, %d handlers match"),
155 bfd_get_filename (abfd
), matches
);
157 else if (matches
== 0)
159 warning (_("\"%s\": no core file handler recognizes format, using default"),
160 bfd_get_filename (abfd
));
164 yummy
= core_file_fns
;
169 /* The default is to reject every core file format we see. Either
170 BFD has to recognize it, or we have to provide a function in the
171 core file handler that recognizes it. */
174 default_check_format (bfd
*abfd
)
179 /* Attempt to recognize core file formats that BFD rejects. */
182 gdb_check_format (bfd
*abfd
)
186 for (cf
= core_file_fns
; cf
!= NULL
; cf
= cf
->next
)
188 if (cf
->check_format (abfd
))
196 /* Discard all vestiges of any previous core file and mark data and stack
200 core_close (int quitting
)
206 int pid
= ptid_get_pid (inferior_ptid
);
207 inferior_ptid
= null_ptid
; /* Avoid confusion from thread stuff */
208 delete_inferior_silent (pid
);
210 /* Clear out solib state while the bfd is still open. See
211 comments in clear_solib in solib.c. */
214 xfree (core_data
->sections
);
218 name
= bfd_get_filename (core_bfd
);
219 if (!bfd_close (core_bfd
))
220 warning (_("cannot close \"%s\": %s"),
221 name
, bfd_errmsg (bfd_get_error ()));
230 core_close_cleanup (void *ignore
)
232 core_close (0/*ignored*/);
235 /* Look for sections whose names start with `.reg/' so that we can extract the
236 list of threads in a core file. */
239 add_to_thread_list (bfd
*abfd
, asection
*asect
, void *reg_sect_arg
)
243 asection
*reg_sect
= (asection
*) reg_sect_arg
;
245 if (strncmp (bfd_section_name (abfd
, asect
), ".reg/", 5) != 0)
248 thread_id
= atoi (bfd_section_name (abfd
, asect
) + 5);
251 && gdbarch_core_reg_section_encodes_pid (core_gdbarch
))
253 uint32_t merged_pid
= thread_id
;
254 ptid
= ptid_build (merged_pid
& 0xffff,
255 merged_pid
>> 16, 0);
258 ptid
= ptid_build (ptid_get_pid (inferior_ptid
), thread_id
, 0);
260 if (ptid_get_lwp (inferior_ptid
) == 0)
261 /* The main thread has already been added before getting here, and
262 this is the first time we hear about a thread id. Assume this
263 is the main thread. */
264 thread_change_ptid (inferior_ptid
, ptid
);
266 /* Nope, really a new thread. */
269 /* Warning, Will Robinson, looking at BFD private data! */
272 && asect
->filepos
== reg_sect
->filepos
) /* Did we find .reg? */
273 inferior_ptid
= ptid
; /* Yes, make it current */
276 /* This routine opens and sets up the core file bfd. */
279 core_open (char *filename
, int from_tty
)
283 struct cleanup
*old_chain
;
288 int corelow_pid
= CORELOW_PID
;
290 target_preopen (from_tty
);
294 error (_("No core file specified. (Use `detach' to stop debugging a core file.)"));
296 error (_("No core file specified."));
299 filename
= tilde_expand (filename
);
300 if (!IS_ABSOLUTE_PATH(filename
))
302 temp
= concat (current_directory
, "/", filename
, (char *)NULL
);
307 old_chain
= make_cleanup (xfree
, filename
);
309 flags
= O_BINARY
| O_LARGEFILE
;
314 scratch_chan
= open (filename
, flags
, 0);
315 if (scratch_chan
< 0)
316 perror_with_name (filename
);
318 temp_bfd
= bfd_fopen (filename
, gnutarget
,
319 write_files
? FOPEN_RUB
: FOPEN_RB
,
321 if (temp_bfd
== NULL
)
322 perror_with_name (filename
);
324 if (!bfd_check_format (temp_bfd
, bfd_core
) &&
325 !gdb_check_format (temp_bfd
))
327 /* Do it after the err msg */
328 /* FIXME: should be checking for errors from bfd_close (for one thing,
329 on error it does not free all the storage associated with the
331 make_cleanup_bfd_close (temp_bfd
);
332 error (_("\"%s\" is not a core dump: %s"),
333 filename
, bfd_errmsg (bfd_get_error ()));
336 /* Looks semi-reasonable. Toss the old core file and work on the new. */
338 discard_cleanups (old_chain
); /* Don't free filename any more */
339 unpush_target (&core_ops
);
341 old_chain
= make_cleanup (core_close_cleanup
, 0 /*ignore*/);
343 /* FIXME: kettenis/20031023: This is very dangerous. The
344 CORE_GDBARCH that results from this call may very well be
345 different from CURRENT_GDBARCH. However, its methods may only
346 work if it is selected as the current architecture, because they
347 rely on swapped data (see gdbarch.c). We should get rid of that
349 core_gdbarch
= gdbarch_from_bfd (core_bfd
);
351 /* Find a suitable core file handler to munch on core_bfd */
352 core_vec
= sniff_core_bfd (core_bfd
);
356 core_data
= XZALLOC (struct target_section_table
);
358 /* Find the data section */
359 if (build_section_table (core_bfd
,
360 &core_data
->sections
, &core_data
->sections_end
))
361 error (_("\"%s\": Can't find sections: %s"),
362 bfd_get_filename (core_bfd
), bfd_errmsg (bfd_get_error ()));
364 /* If we have no exec file, try to set the architecture from the
365 core file. We don't do this unconditionally since an exec file
366 typically contains more information that helps us determine the
367 architecture than a core file. */
369 set_gdbarch_from_file (core_bfd
);
371 push_target (&core_ops
);
372 discard_cleanups (old_chain
);
374 add_inferior_silent (corelow_pid
);
376 /* Do this before acknowledging the inferior, so if
377 post_create_inferior throws (can happen easilly if you're loading
378 a core file with the wrong exec), we aren't left with threads
379 from the previous inferior. */
382 /* Set INFERIOR_PTID early, so an upper layer can rely on it being
383 set while in the target_find_new_threads call below. */
384 inferior_ptid
= pid_to_ptid (corelow_pid
);
386 /* Assume ST --- Add a main task. We'll later detect when we go
388 add_thread_silent (inferior_ptid
);
390 /* Need to flush the register cache (and the frame cache) from a
391 previous debug session. If inferior_ptid ends up the same as the
392 last debug session --- e.g., b foo; run; gcore core1; step; gcore
393 core2; core core1; core core2 --- then there's potential for
394 get_current_regcache to return the cached regcache of the
395 previous session, and the frame cache being stale. */
396 registers_changed ();
398 /* Build up thread list from BFD sections, and possibly set the
399 current thread to the .reg/NN section matching the .reg
401 bfd_map_over_sections (core_bfd
, add_to_thread_list
,
402 bfd_get_section_by_name (core_bfd
, ".reg"));
404 post_create_inferior (&core_ops
, from_tty
);
406 /* Now go through the target stack looking for threads since there
407 may be a thread_stratum target loaded on top of target core by
408 now. The layer above should claim threads found in the BFD
410 target_find_new_threads ();
412 p
= bfd_core_file_failing_command (core_bfd
);
414 printf_filtered (_("Core was generated by `%s'.\n"), p
);
416 siggy
= bfd_core_file_failing_signal (core_bfd
);
418 /* NOTE: target_signal_from_host() converts a target signal value
419 into gdb's internal signal value. Unfortunately gdb's internal
420 value is called ``target_signal'' and this function got the
421 name ..._from_host(). */
422 printf_filtered (_("Program terminated with signal %d, %s.\n"), siggy
,
423 target_signal_to_string (
424 gdbarch_target_signal_from_host (core_gdbarch
, siggy
)));
426 /* Fetch all registers from core file. */
427 target_fetch_registers (get_current_regcache (), -1);
429 /* Now, set up the frame cache, and print the top of stack. */
430 reinit_frame_cache ();
431 print_stack_frame (get_selected_frame (NULL
), 1, SRC_AND_LOC
);
435 core_detach (struct target_ops
*ops
, char *args
, int from_tty
)
438 error (_("Too many arguments"));
440 reinit_frame_cache ();
442 printf_filtered (_("No core file now.\n"));
445 #ifdef DEPRECATED_IBM6000_TARGET
447 /* Resize the core memory's section table, by NUM_ADDED. Returns a
448 pointer into the first new slot. This will not be necessary when
449 the rs6000 target is converted to use the standard solib
452 struct target_section
*
453 deprecated_core_resize_section_table (int num_added
)
457 old_count
= resize_section_table (core_data
, num_added
);
458 return core_data
->sections
+ old_count
;
463 /* Try to retrieve registers from a section in core_bfd, and supply
464 them to core_vec->core_read_registers, as the register set numbered
467 If inferior_ptid's lwp member is zero, do the single-threaded
468 thing: look for a section named NAME. If inferior_ptid's lwp
469 member is non-zero, do the multi-threaded thing: look for a section
470 named "NAME/LWP", where LWP is the shortest ASCII decimal
471 representation of inferior_ptid's lwp member.
473 HUMAN_NAME is a human-readable name for the kind of registers the
474 NAME section contains, for use in error messages.
476 If REQUIRED is non-zero, print an error if the core file doesn't
477 have a section by the appropriate name. Otherwise, just do nothing. */
480 get_core_register_section (struct regcache
*regcache
,
486 static char *section_name
= NULL
;
487 struct bfd_section
*section
;
491 xfree (section_name
);
494 && gdbarch_core_reg_section_encodes_pid (core_gdbarch
))
498 merged_pid
= ptid_get_lwp (inferior_ptid
);
499 merged_pid
= merged_pid
<< 16 | ptid_get_pid (inferior_ptid
);
501 section_name
= xstrprintf ("%s/%s", name
, plongest (merged_pid
));
503 else if (ptid_get_lwp (inferior_ptid
))
504 section_name
= xstrprintf ("%s/%ld", name
, ptid_get_lwp (inferior_ptid
));
506 section_name
= xstrdup (name
);
508 section
= bfd_get_section_by_name (core_bfd
, section_name
);
512 warning (_("Couldn't find %s registers in core file."), human_name
);
516 size
= bfd_section_size (core_bfd
, section
);
517 contents
= alloca (size
);
518 if (! bfd_get_section_contents (core_bfd
, section
, contents
,
521 warning (_("Couldn't read %s registers from `%s' section in core file."),
526 if (core_gdbarch
&& gdbarch_regset_from_core_section_p (core_gdbarch
))
528 const struct regset
*regset
;
530 regset
= gdbarch_regset_from_core_section (core_gdbarch
, name
, size
);
534 warning (_("Couldn't recognize %s registers in core file."),
539 regset
->supply_regset (regset
, regcache
, -1, contents
, size
);
543 gdb_assert (core_vec
);
544 core_vec
->core_read_registers (regcache
, contents
, size
, which
,
546 bfd_section_vma (core_bfd
, section
)));
550 /* Get the registers out of a core file. This is the machine-
551 independent part. Fetch_core_registers is the machine-dependent
552 part, typically implemented in the xm-file for each architecture. */
554 /* We just get all the registers, so we don't use regno. */
557 get_core_registers (struct target_ops
*ops
,
558 struct regcache
*regcache
, int regno
)
562 if (!(core_gdbarch
&& gdbarch_regset_from_core_section_p (core_gdbarch
))
563 && (core_vec
== NULL
|| core_vec
->core_read_registers
== NULL
))
565 fprintf_filtered (gdb_stderr
,
566 "Can't fetch registers from this type of core file\n");
570 get_core_register_section (regcache
,
571 ".reg", 0, "general-purpose", 1);
572 get_core_register_section (regcache
,
573 ".reg2", 2, "floating-point", 0);
574 get_core_register_section (regcache
,
575 ".reg-xfp", 3, "extended floating-point", 0);
576 get_core_register_section (regcache
,
577 ".reg-ppc-vmx", 3, "ppc Altivec", 0);
578 get_core_register_section (regcache
,
579 ".reg-ppc-vsx", 4, "POWER7 VSX", 0);
581 /* Supply dummy value for all registers not found in the core. */
582 for (i
= 0; i
< gdbarch_num_regs (get_regcache_arch (regcache
)); i
++)
583 if (!regcache_valid_p (regcache
, i
))
584 regcache_raw_supply (regcache
, i
, NULL
);
588 core_files_info (struct target_ops
*t
)
590 print_section_info (core_data
, core_bfd
);
594 core_xfer_partial (struct target_ops
*ops
, enum target_object object
,
595 const char *annex
, gdb_byte
*readbuf
,
596 const gdb_byte
*writebuf
, ULONGEST offset
, LONGEST len
)
600 case TARGET_OBJECT_MEMORY
:
601 return section_table_xfer_memory_partial (readbuf
, writebuf
,
604 core_data
->sections_end
,
607 case TARGET_OBJECT_AUXV
:
610 /* When the aux vector is stored in core file, BFD
611 represents this with a fake section called ".auxv". */
613 struct bfd_section
*section
;
617 section
= bfd_get_section_by_name (core_bfd
, ".auxv");
621 size
= bfd_section_size (core_bfd
, section
);
628 && !bfd_get_section_contents (core_bfd
, section
, readbuf
,
629 (file_ptr
) offset
, size
))
631 warning (_("Couldn't read NT_AUXV note in core file."));
639 case TARGET_OBJECT_WCOOKIE
:
642 /* When the StackGhost cookie is stored in core file, BFD
643 represents this with a fake section called ".wcookie". */
645 struct bfd_section
*section
;
649 section
= bfd_get_section_by_name (core_bfd
, ".wcookie");
653 size
= bfd_section_size (core_bfd
, section
);
660 && !bfd_get_section_contents (core_bfd
, section
, readbuf
,
661 (file_ptr
) offset
, size
))
663 warning (_("Couldn't read StackGhost cookie in core file."));
671 case TARGET_OBJECT_LIBRARIES
:
673 && gdbarch_core_xfer_shared_libraries_p (core_gdbarch
))
678 gdbarch_core_xfer_shared_libraries (core_gdbarch
,
679 readbuf
, offset
, len
);
684 if (ops
->beneath
!= NULL
)
685 return ops
->beneath
->to_xfer_partial (ops
->beneath
, object
, annex
,
686 readbuf
, writebuf
, offset
, len
);
692 /* If mourn is being called in all the right places, this could be say
693 `gdb internal error' (since generic_mourn calls breakpoint_init_inferior). */
696 ignore (struct bp_target_info
*bp_tgt
)
702 /* Okay, let's be honest: threads gleaned from a core file aren't
703 exactly lively, are they? On the other hand, if we don't claim
704 that each & every one is alive, then we don't get any of them
705 to appear in an "info thread" command, which is quite a useful
709 core_thread_alive (struct target_ops
*ops
, ptid_t ptid
)
714 /* Ask the current architecture what it knows about this core file.
715 That will be used, in turn, to pick a better architecture. This
716 wrapper could be avoided if targets got a chance to specialize
719 static const struct target_desc
*
720 core_read_description (struct target_ops
*target
)
722 if (gdbarch_core_read_description_p (current_gdbarch
))
723 return gdbarch_core_read_description (current_gdbarch
, target
, core_bfd
);
729 core_pid_to_str (struct target_ops
*ops
, ptid_t ptid
)
734 && gdbarch_core_pid_to_str_p (core_gdbarch
))
736 char *ret
= gdbarch_core_pid_to_str (core_gdbarch
, ptid
);
741 if (ptid_get_lwp (ptid
) == 0)
742 xsnprintf (buf
, sizeof buf
, "<main task>");
744 xsnprintf (buf
, sizeof buf
, "Thread %ld", ptid_get_lwp (ptid
));
749 /* Fill in core_ops with its defined operations and properties. */
754 core_ops
.to_shortname
= "core";
755 core_ops
.to_longname
= "Local core dump file";
757 "Use a core file as a target. Specify the filename of the core file.";
758 core_ops
.to_open
= core_open
;
759 core_ops
.to_close
= core_close
;
760 core_ops
.to_attach
= find_default_attach
;
761 core_ops
.to_detach
= core_detach
;
762 core_ops
.to_fetch_registers
= get_core_registers
;
763 core_ops
.to_xfer_partial
= core_xfer_partial
;
764 core_ops
.to_files_info
= core_files_info
;
765 core_ops
.to_insert_breakpoint
= ignore
;
766 core_ops
.to_remove_breakpoint
= ignore
;
767 core_ops
.to_create_inferior
= find_default_create_inferior
;
768 core_ops
.to_thread_alive
= core_thread_alive
;
769 core_ops
.to_read_description
= core_read_description
;
770 core_ops
.to_pid_to_str
= core_pid_to_str
;
771 core_ops
.to_stratum
= core_stratum
;
772 core_ops
.to_has_memory
= 1;
773 core_ops
.to_has_stack
= 1;
774 core_ops
.to_has_registers
= 1;
775 core_ops
.to_magic
= OPS_MAGIC
;
779 _initialize_corelow (void)
783 add_target (&core_ops
);