1 /* Core dump and executable file functions below target vector, for GDB.
3 Copyright 1986, 1987, 1989, 1991, 1992, 1993, 1994, 1995, 1996,
4 1997, 1998, 1999, 2000, 2001, 2003 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"
42 #include <readline/readline.h>
48 /* List of all available core_fns. On gdb startup, each core file register
49 reader calls add_core_fns() to register information on each core format it
50 is prepared to read. */
52 static struct core_fns
*core_file_fns
= NULL
;
54 /* The core_fns for a core file handler that is prepared to read the core
55 file currently open on core_bfd. */
57 static struct core_fns
*core_vec
= NULL
;
59 static void core_files_info (struct target_ops
*);
62 static int solib_add_stub (void *);
65 static struct core_fns
*sniff_core_bfd (bfd
*);
67 static int gdb_check_format (bfd
*);
69 static void core_open (char *, int);
71 static void core_detach (char *, int);
73 static void core_close (int);
75 static void core_close_cleanup (void *ignore
);
77 static void get_core_registers (int);
79 static void add_to_thread_list (bfd
*, asection
*, void *);
81 static int ignore (CORE_ADDR
, char *);
83 static int core_file_thread_alive (ptid_t tid
);
85 static void init_core_ops (void);
87 void _initialize_corelow (void);
89 struct target_ops core_ops
;
91 /* Link a new core_fns into the global core_file_fns list. Called on gdb
92 startup by the _initialize routine in each core file register reader, to
93 register information about each format the the reader is prepared to
97 add_core_fns (struct core_fns
*cf
)
99 cf
->next
= core_file_fns
;
103 /* The default function that core file handlers can use to examine a
104 core file BFD and decide whether or not to accept the job of
105 reading the core file. */
108 default_core_sniffer (struct core_fns
*our_fns
, bfd
*abfd
)
112 result
= (bfd_get_flavour (abfd
) == our_fns
-> core_flavour
);
116 /* Walk through the list of core functions to find a set that can
117 handle the core file open on ABFD. Default to the first one in the
118 list if nothing matches. Returns pointer to set that is
121 static struct core_fns
*
122 sniff_core_bfd (bfd
*abfd
)
125 struct core_fns
*yummy
= NULL
;
128 for (cf
= core_file_fns
; cf
!= NULL
; cf
= cf
->next
)
130 if (cf
->core_sniffer (cf
, abfd
))
138 warning ("\"%s\": ambiguous core format, %d handlers match",
139 bfd_get_filename (abfd
), matches
);
141 else if (matches
== 0)
143 warning ("\"%s\": no core file handler recognizes format, using default",
144 bfd_get_filename (abfd
));
148 yummy
= core_file_fns
;
153 /* The default is to reject every core file format we see. Either
154 BFD has to recognize it, or we have to provide a function in the
155 core file handler that recognizes it. */
158 default_check_format (bfd
*abfd
)
163 /* Attempt to recognize core file formats that BFD rejects. */
166 gdb_check_format (bfd
*abfd
)
170 for (cf
= core_file_fns
; cf
!= NULL
; cf
= cf
->next
)
172 if (cf
->check_format (abfd
))
180 /* Discard all vestiges of any previous core file and mark data and stack
184 core_close (int quitting
)
190 inferior_ptid
= null_ptid
; /* 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 (void *from_ttyp
)
227 SOLIB_ADD (NULL
, *(int *) from_ttyp
, ¤t_target
, auto_solib_add
);
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
, void *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 (pid_to_ptid (thread_id
));
249 /* Warning, Will Robinson, looking at BFD private data! */
252 && asect
->filepos
== reg_sect
->filepos
) /* Did we find .reg? */
253 inferior_ptid
= pid_to_ptid (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 /* If we have no exec file, try to set the architecture from the
326 core file. We don't do this unconditionally since an exec file
327 typically contains more information that helps us determine the
328 architecture than a core file. */
330 set_gdbarch_from_file (core_bfd
);
332 ontop
= !push_target (&core_ops
);
333 discard_cleanups (old_chain
);
335 p
= bfd_core_file_failing_command (core_bfd
);
337 printf_filtered ("Core was generated by `%s'.\n", p
);
339 siggy
= bfd_core_file_failing_signal (core_bfd
);
341 /* NOTE: target_signal_from_host() converts a target signal value
342 into gdb's internal signal value. Unfortunately gdb's internal
343 value is called ``target_signal'' and this function got the
344 name ..._from_host(). */
345 printf_filtered ("Program terminated with signal %d, %s.\n", siggy
,
346 target_signal_to_string (target_signal_from_host (siggy
)));
348 /* Build up thread list from BFD sections. */
351 bfd_map_over_sections (core_bfd
, add_to_thread_list
,
352 bfd_get_section_by_name (core_bfd
, ".reg"));
356 /* Fetch all registers from core file. */
357 target_fetch_registers (-1);
359 /* Add symbols and section mappings for any shared libraries. */
361 catch_errors (solib_add_stub
, &from_tty
, (char *) 0,
365 /* Now, set up the frame cache, and print the top of stack. */
366 flush_cached_frames ();
367 select_frame (get_current_frame ());
368 print_stack_frame (deprecated_selected_frame
,
369 frame_relative_level (deprecated_selected_frame
), 1);
374 "you won't be able to access this core file until you terminate\n\
375 your %s; do ``info files''", target_longname
);
380 core_detach (char *args
, int from_tty
)
383 error ("Too many arguments");
384 unpush_target (&core_ops
);
385 reinit_frame_cache ();
387 printf_filtered ("No core file now.\n");
391 /* Try to retrieve registers from a section in core_bfd, and supply
392 them to core_vec->core_read_registers, as the register set numbered
395 If inferior_ptid is zero, do the single-threaded thing: look for a
396 section named NAME. If inferior_ptid is non-zero, do the
397 multi-threaded thing: look for a section named "NAME/PID", where
398 PID is the shortest ASCII decimal representation of inferior_ptid.
400 HUMAN_NAME is a human-readable name for the kind of registers the
401 NAME section contains, for use in error messages.
403 If REQUIRED is non-zero, print an error if the core file doesn't
404 have a section by the appropriate name. Otherwise, just do nothing. */
407 get_core_register_section (char *name
,
412 char section_name
[100];
417 if (PIDGET (inferior_ptid
))
418 sprintf (section_name
, "%s/%d", name
, PIDGET (inferior_ptid
));
420 strcpy (section_name
, name
);
422 section
= bfd_get_section_by_name (core_bfd
, section_name
);
426 warning ("Couldn't find %s registers in core file.\n", human_name
);
430 size
= bfd_section_size (core_bfd
, section
);
431 contents
= alloca (size
);
432 if (! bfd_get_section_contents (core_bfd
, section
, contents
,
435 warning ("Couldn't read %s registers from `%s' section in core file.\n",
440 core_vec
->core_read_registers (contents
, size
, which
,
442 bfd_section_vma (core_bfd
, section
)));
446 /* Get the registers out of a core file. This is the machine-
447 independent part. Fetch_core_registers is the machine-dependent
448 part, typically implemented in the xm-file for each architecture. */
450 /* We just get all the registers, so we don't use regno. */
453 get_core_registers (int regno
)
458 || core_vec
->core_read_registers
== NULL
)
460 fprintf_filtered (gdb_stderr
,
461 "Can't fetch registers from this type of core file\n");
465 get_core_register_section (".reg", 0, "general-purpose", 1);
466 get_core_register_section (".reg2", 2, "floating-point", 0);
467 get_core_register_section (".reg-xfp", 3, "extended floating-point", 0);
469 deprecated_registers_fetched ();
473 core_files_info (struct target_ops
*t
)
475 print_section_info (t
, core_bfd
);
478 /* If mourn is being called in all the right places, this could be say
479 `gdb internal error' (since generic_mourn calls breakpoint_init_inferior). */
482 ignore (CORE_ADDR addr
, char *contents
)
488 /* Okay, let's be honest: threads gleaned from a core file aren't
489 exactly lively, are they? On the other hand, if we don't claim
490 that each & every one is alive, then we don't get any of them
491 to appear in an "info thread" command, which is quite a useful
495 core_file_thread_alive (ptid_t tid
)
500 /* Fill in core_ops with its defined operations and properties. */
505 core_ops
.to_shortname
= "core";
506 core_ops
.to_longname
= "Local core dump file";
508 "Use a core file as a target. Specify the filename of the core file.";
509 core_ops
.to_open
= core_open
;
510 core_ops
.to_close
= core_close
;
511 core_ops
.to_attach
= find_default_attach
;
512 core_ops
.to_detach
= core_detach
;
513 core_ops
.to_fetch_registers
= get_core_registers
;
514 core_ops
.to_xfer_memory
= xfer_memory
;
515 core_ops
.to_files_info
= core_files_info
;
516 core_ops
.to_insert_breakpoint
= ignore
;
517 core_ops
.to_remove_breakpoint
= ignore
;
518 core_ops
.to_create_inferior
= find_default_create_inferior
;
519 core_ops
.to_thread_alive
= core_file_thread_alive
;
520 core_ops
.to_stratum
= core_stratum
;
521 core_ops
.to_has_memory
= 1;
522 core_ops
.to_has_stack
= 1;
523 core_ops
.to_has_registers
= 1;
524 core_ops
.to_magic
= OPS_MAGIC
;
527 /* non-zero if we should not do the add_target call in
528 _initialize_corelow; not initialized (i.e., bss) so that
529 the target can initialize it (i.e., data) if appropriate.
530 This needs to be set at compile time because we don't know
531 for sure whether the target's initialize routine is called
532 before us or after us. */
533 int coreops_suppress_target
;
536 _initialize_corelow (void)
540 if (!coreops_suppress_target
)
541 add_target (&core_ops
);