1 /* Core dump and executable file functions below target vector, for GDB.
2 Copyright 1986, 1987, 1989, 1991, 1992, 1993, 1994, 1995, 1996, 1997,
4 Free Software Foundation, Inc.
6 This file is part of GDB.
8 This program is free software; you can redistribute it and/or modify
9 it under the terms of the GNU General Public License as published by
10 the Free Software Foundation; either version 2 of the License, or
11 (at your option) any later version.
13 This program is distributed in the hope that it will be useful,
14 but WITHOUT ANY WARRANTY; without even the implied warranty of
15 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
16 GNU General Public License for more details.
18 You should have received a copy of the GNU General Public License
19 along with this program; if not, write to the Free Software
20 Foundation, Inc., 59 Temple Place - Suite 330,
21 Boston, MA 02111-1307, USA. */
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"
45 /* List of all available core_fns. On gdb startup, each core file register
46 reader calls add_core_fns() to register information on each core format it
47 is prepared to read. */
49 static struct core_fns
*core_file_fns
= NULL
;
51 /* The core_fns for a core file handler that is prepared to read the core
52 file currently open on core_bfd. */
54 static struct core_fns
*core_vec
= NULL
;
56 static void core_files_info (struct target_ops
*);
59 static int solib_add_stub (PTR
);
62 static struct core_fns
*sniff_core_bfd (bfd
*);
64 static boolean
gdb_check_format (bfd
*);
66 static void core_open (char *, int);
68 static void core_detach (char *, int);
70 static void core_close (int);
72 static void core_close_cleanup (void *ignore
);
74 static void get_core_registers (int);
76 static void add_to_thread_list (bfd
*, asection
*, PTR
);
78 static int ignore (CORE_ADDR
, char *);
80 static char *core_file_to_sym_file (char *);
82 static int core_file_thread_alive (int tid
);
84 static void init_core_ops (void);
86 void _initialize_corelow (void);
88 struct target_ops core_ops
;
90 /* Link a new core_fns into the global core_file_fns list. Called on gdb
91 startup by the _initialize routine in each core file register reader, to
92 register information about each format the the reader is prepared to
96 add_core_fns (struct core_fns
*cf
)
98 cf
->next
= core_file_fns
;
102 /* The default function that core file handlers can use to examine a
103 core file BFD and decide whether or not to accept the job of
104 reading the core file. */
107 default_core_sniffer (struct core_fns
*our_fns
, bfd
*abfd
)
111 result
= (bfd_get_flavour (abfd
) == our_fns
-> core_flavour
);
115 /* Walk through the list of core functions to find a set that can
116 handle the core file open on ABFD. Default to the first one in the
117 list if nothing matches. Returns pointer to set that is
120 static struct core_fns
*
121 sniff_core_bfd (bfd
*abfd
)
124 struct core_fns
*yummy
= NULL
;
127 for (cf
= core_file_fns
; cf
!= NULL
; cf
= cf
->next
)
129 if (cf
->core_sniffer (cf
, abfd
))
137 warning ("\"%s\": ambiguous core format, %d handlers match",
138 bfd_get_filename (abfd
), matches
);
140 else if (matches
== 0)
142 warning ("\"%s\": no core file handler recognizes format, using default",
143 bfd_get_filename (abfd
));
147 yummy
= core_file_fns
;
152 /* The default is to reject every core file format we see. Either
153 BFD has to recognize it, or we have to provide a function in the
154 core file handler that recognizes it. */
157 default_check_format (bfd
*abfd
)
162 /* Attempt to recognize core file formats that BFD rejects. */
165 gdb_check_format (bfd
*abfd
)
169 for (cf
= core_file_fns
; cf
!= NULL
; cf
= cf
->next
)
171 if (cf
->check_format (abfd
))
179 /* Discard all vestiges of any previous core file and mark data and stack
184 core_close (int quitting
)
190 inferior_pid
= 0; /* Avoid confusion from thread stuff */
192 /* Clear out solib state while the bfd is still open. See
193 comments in clear_solib in solib.c. */
198 name
= bfd_get_filename (core_bfd
);
199 if (!bfd_close (core_bfd
))
200 warning ("cannot close \"%s\": %s",
201 name
, bfd_errmsg (bfd_get_error ()));
204 if (core_ops
.to_sections
)
206 xfree (core_ops
.to_sections
);
207 core_ops
.to_sections
= NULL
;
208 core_ops
.to_sections_end
= NULL
;
215 core_close_cleanup (void *ignore
)
217 core_close (0/*ignored*/);
221 /* Stub function for catch_errors around shared library hacking. FROM_TTYP
222 is really an int * which points to from_tty. */
225 solib_add_stub (PTR from_ttyp
)
227 SOLIB_ADD (NULL
, *(int *) from_ttyp
, ¤t_target
);
228 re_enable_breakpoints_in_shlibs ();
231 #endif /* SOLIB_ADD */
233 /* Look for sections whose names start with `.reg/' so that we can extract the
234 list of threads in a core file. */
237 add_to_thread_list (bfd
*abfd
, asection
*asect
, PTR reg_sect_arg
)
240 asection
*reg_sect
= (asection
*) reg_sect_arg
;
242 if (strncmp (bfd_section_name (abfd
, asect
), ".reg/", 5) != 0)
245 thread_id
= atoi (bfd_section_name (abfd
, asect
) + 5);
247 add_thread (thread_id
);
249 /* Warning, Will Robinson, looking at BFD private data! */
252 && asect
->filepos
== reg_sect
->filepos
) /* Did we find .reg? */
253 inferior_pid
= thread_id
; /* Yes, make it current */
256 /* This routine opens and sets up the core file bfd. */
259 core_open (char *filename
, int from_tty
)
263 struct cleanup
*old_chain
;
269 target_preopen (from_tty
);
273 "No core file specified. (Use `detach' to stop debugging a core file.)"
274 : "No core file specified.");
277 filename
= tilde_expand (filename
);
278 if (filename
[0] != '/')
280 temp
= concat (current_directory
, "/", filename
, NULL
);
285 old_chain
= make_cleanup (xfree
, filename
);
287 scratch_chan
= open (filename
, O_BINARY
| ( write_files
? O_RDWR
: O_RDONLY
), 0);
288 if (scratch_chan
< 0)
289 perror_with_name (filename
);
291 temp_bfd
= bfd_fdopenr (filename
, gnutarget
, scratch_chan
);
292 if (temp_bfd
== NULL
)
293 perror_with_name (filename
);
295 if (!bfd_check_format (temp_bfd
, bfd_core
) &&
296 !gdb_check_format (temp_bfd
))
298 /* Do it after the err msg */
299 /* FIXME: should be checking for errors from bfd_close (for one thing,
300 on error it does not free all the storage associated with the
302 make_cleanup_bfd_close (temp_bfd
);
303 error ("\"%s\" is not a core dump: %s",
304 filename
, bfd_errmsg (bfd_get_error ()));
307 /* Looks semi-reasonable. Toss the old core file and work on the new. */
309 discard_cleanups (old_chain
); /* Don't free filename any more */
310 unpush_target (&core_ops
);
312 old_chain
= make_cleanup (core_close_cleanup
, 0 /*ignore*/);
314 /* Find a suitable core file handler to munch on core_bfd */
315 core_vec
= sniff_core_bfd (core_bfd
);
319 /* Find the data section */
320 if (build_section_table (core_bfd
, &core_ops
.to_sections
,
321 &core_ops
.to_sections_end
))
322 error ("\"%s\": Can't find sections: %s",
323 bfd_get_filename (core_bfd
), bfd_errmsg (bfd_get_error ()));
325 set_gdbarch_from_file (core_bfd
);
327 ontop
= !push_target (&core_ops
);
328 discard_cleanups (old_chain
);
330 p
= bfd_core_file_failing_command (core_bfd
);
332 printf_filtered ("Core was generated by `%s'.\n", p
);
334 siggy
= bfd_core_file_failing_signal (core_bfd
);
336 /* NOTE: target_signal_from_host() converts a target signal value
337 into gdb's internal signal value. Unfortunately gdb's internal
338 value is called ``target_signal'' and this function got the
339 name ..._from_host(). */
340 printf_filtered ("Program terminated with signal %d, %s.\n", siggy
,
341 target_signal_to_string (target_signal_from_host (siggy
)));
343 /* Build up thread list from BFD sections. */
346 bfd_map_over_sections (core_bfd
, add_to_thread_list
,
347 bfd_get_section_by_name (core_bfd
, ".reg"));
351 /* Fetch all registers from core file. */
352 target_fetch_registers (-1);
354 /* Add symbols and section mappings for any shared libraries. */
356 catch_errors (solib_add_stub
, &from_tty
, (char *) 0,
360 /* Now, set up the frame cache, and print the top of stack. */
361 flush_cached_frames ();
362 select_frame (get_current_frame (), 0);
363 print_stack_frame (selected_frame
, selected_frame_level
, 1);
368 "you won't be able to access this core file until you terminate\n\
369 your %s; do ``info files''", target_longname
);
374 core_detach (char *args
, int from_tty
)
377 error ("Too many arguments");
378 unpush_target (&core_ops
);
379 reinit_frame_cache ();
381 printf_filtered ("No core file now.\n");
385 /* Try to retrieve registers from a section in core_bfd, and supply
386 them to core_vec->core_read_registers, as the register set numbered
389 If inferior_pid is zero, do the single-threaded thing: look for a
390 section named NAME. If inferior_pid is non-zero, do the
391 multi-threaded thing: look for a section named "NAME/PID", where
392 PID is the shortest ASCII decimal representation of inferior_pid.
394 HUMAN_NAME is a human-readable name for the kind of registers the
395 NAME section contains, for use in error messages.
397 If REQUIRED is non-zero, print an error if the core file doesn't
398 have a section by the appropriate name. Otherwise, just do nothing. */
401 get_core_register_section (char *name
,
406 char section_name
[100];
412 sprintf (section_name
, "%s/%d", name
, inferior_pid
);
414 strcpy (section_name
, name
);
416 section
= bfd_get_section_by_name (core_bfd
, section_name
);
420 warning ("Couldn't find %s registers in core file.\n", human_name
);
424 size
= bfd_section_size (core_bfd
, section
);
425 contents
= alloca (size
);
426 if (! bfd_get_section_contents (core_bfd
, section
, contents
,
429 warning ("Couldn't read %s registers from `%s' section in core file.\n",
434 core_vec
->core_read_registers (contents
, size
, which
,
436 bfd_section_vma (core_bfd
, section
)));
440 /* Get the registers out of a core file. This is the machine-
441 independent part. Fetch_core_registers is the machine-dependent
442 part, typically implemented in the xm-file for each architecture. */
444 /* We just get all the registers, so we don't use regno. */
448 get_core_registers (int regno
)
453 || core_vec
->core_read_registers
== NULL
)
455 fprintf_filtered (gdb_stderr
,
456 "Can't fetch registers from this type of core file\n");
460 get_core_register_section (".reg", 0, "general-purpose", 1);
461 get_core_register_section (".reg2", 2, "floating-point", 0);
462 get_core_register_section (".reg-xfp", 3, "extended floating-point", 0);
464 registers_fetched ();
468 core_file_to_sym_file (char *core
)
470 CONST
char *failing_command
;
477 error ("No core file specified.");
479 core
= tilde_expand (core
);
482 temp
= concat (current_directory
, "/", core
, NULL
);
486 scratch_chan
= open (core
, write_files
? O_RDWR
: O_RDONLY
, 0);
487 if (scratch_chan
< 0)
488 perror_with_name (core
);
490 temp_bfd
= bfd_fdopenr (core
, gnutarget
, scratch_chan
);
491 if (temp_bfd
== NULL
)
492 perror_with_name (core
);
494 if (!bfd_check_format (temp_bfd
, bfd_core
))
496 /* Do it after the err msg */
497 /* FIXME: should be checking for errors from bfd_close (for one thing,
498 on error it does not free all the storage associated with the
500 make_cleanup_bfd_close (temp_bfd
);
501 error ("\"%s\" is not a core dump: %s",
502 core
, bfd_errmsg (bfd_get_error ()));
505 /* Find the data section */
506 if (build_section_table (temp_bfd
, &core_ops
.to_sections
,
507 &core_ops
.to_sections_end
))
508 error ("\"%s\": Can't find sections: %s",
509 bfd_get_filename (temp_bfd
), bfd_errmsg (bfd_get_error ()));
511 failing_command
= bfd_core_file_failing_command (temp_bfd
);
513 bfd_close (temp_bfd
);
515 /* If we found a filename, remember that it is probably saved
516 relative to the executable that created it. If working directory
517 isn't there now, we may not be able to find the executable. Rather
518 than trying to be sauve about finding it, just check if the file
519 exists where we are now. If not, then punt and tell our client
520 we couldn't find the sym file.
522 p
= (char *) failing_command
;
523 if ((p
!= NULL
) && (access (p
, F_OK
) != 0))
530 core_files_info (struct target_ops
*t
)
532 print_section_info (t
, core_bfd
);
535 /* If mourn is being called in all the right places, this could be say
536 `gdb internal error' (since generic_mourn calls breakpoint_init_inferior). */
539 ignore (CORE_ADDR addr
, char *contents
)
545 /* Okay, let's be honest: threads gleaned from a core file aren't
546 exactly lively, are they? On the other hand, if we don't claim
547 that each & every one is alive, then we don't get any of them
548 to appear in an "info thread" command, which is quite a useful
552 core_file_thread_alive (int tid
)
557 /* Fill in core_ops with its defined operations and properties. */
562 core_ops
.to_shortname
= "core";
563 core_ops
.to_longname
= "Local core dump file";
565 "Use a core file as a target. Specify the filename of the core file.";
566 core_ops
.to_open
= core_open
;
567 core_ops
.to_close
= core_close
;
568 core_ops
.to_attach
= find_default_attach
;
569 core_ops
.to_require_attach
= find_default_require_attach
;
570 core_ops
.to_detach
= core_detach
;
571 core_ops
.to_require_detach
= find_default_require_detach
;
572 core_ops
.to_fetch_registers
= get_core_registers
;
573 core_ops
.to_xfer_memory
= xfer_memory
;
574 core_ops
.to_files_info
= core_files_info
;
575 core_ops
.to_insert_breakpoint
= ignore
;
576 core_ops
.to_remove_breakpoint
= ignore
;
577 core_ops
.to_create_inferior
= find_default_create_inferior
;
578 core_ops
.to_clone_and_follow_inferior
= find_default_clone_and_follow_inferior
;
579 core_ops
.to_thread_alive
= core_file_thread_alive
;
580 core_ops
.to_core_file_to_sym_file
= core_file_to_sym_file
;
581 core_ops
.to_stratum
= core_stratum
;
582 core_ops
.to_has_memory
= 1;
583 core_ops
.to_has_stack
= 1;
584 core_ops
.to_has_registers
= 1;
585 core_ops
.to_magic
= OPS_MAGIC
;
588 /* non-zero if we should not do the add_target call in
589 _initialize_corelow; not initialized (i.e., bss) so that
590 the target can initialize it (i.e., data) if appropriate.
591 This needs to be set at compile time because we don't know
592 for sure whether the target's initialize routine is called
593 before us or after us. */
594 int coreops_suppress_target
;
597 _initialize_corelow (void)
601 if (!coreops_suppress_target
)
602 add_target (&core_ops
);