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 int core_file_thread_alive (ptid_t tid
);
82 static void init_core_ops (void);
84 void _initialize_corelow (void);
86 struct target_ops core_ops
;
88 /* Link a new core_fns into the global core_file_fns list. Called on gdb
89 startup by the _initialize routine in each core file register reader, to
90 register information about each format the the reader is prepared to
94 add_core_fns (struct core_fns
*cf
)
96 cf
->next
= core_file_fns
;
100 /* The default function that core file handlers can use to examine a
101 core file BFD and decide whether or not to accept the job of
102 reading the core file. */
105 default_core_sniffer (struct core_fns
*our_fns
, bfd
*abfd
)
109 result
= (bfd_get_flavour (abfd
) == our_fns
-> core_flavour
);
113 /* Walk through the list of core functions to find a set that can
114 handle the core file open on ABFD. Default to the first one in the
115 list if nothing matches. Returns pointer to set that is
118 static struct core_fns
*
119 sniff_core_bfd (bfd
*abfd
)
122 struct core_fns
*yummy
= NULL
;
125 for (cf
= core_file_fns
; cf
!= NULL
; cf
= cf
->next
)
127 if (cf
->core_sniffer (cf
, abfd
))
135 warning ("\"%s\": ambiguous core format, %d handlers match",
136 bfd_get_filename (abfd
), matches
);
138 else if (matches
== 0)
140 warning ("\"%s\": no core file handler recognizes format, using default",
141 bfd_get_filename (abfd
));
145 yummy
= core_file_fns
;
150 /* The default is to reject every core file format we see. Either
151 BFD has to recognize it, or we have to provide a function in the
152 core file handler that recognizes it. */
155 default_check_format (bfd
*abfd
)
160 /* Attempt to recognize core file formats that BFD rejects. */
163 gdb_check_format (bfd
*abfd
)
167 for (cf
= core_file_fns
; cf
!= NULL
; cf
= cf
->next
)
169 if (cf
->check_format (abfd
))
177 /* Discard all vestiges of any previous core file and mark data and stack
182 core_close (int quitting
)
188 inferior_ptid
= null_ptid
; /* Avoid confusion from thread stuff */
190 /* Clear out solib state while the bfd is still open. See
191 comments in clear_solib in solib.c. */
196 name
= bfd_get_filename (core_bfd
);
197 if (!bfd_close (core_bfd
))
198 warning ("cannot close \"%s\": %s",
199 name
, bfd_errmsg (bfd_get_error ()));
202 if (core_ops
.to_sections
)
204 xfree (core_ops
.to_sections
);
205 core_ops
.to_sections
= NULL
;
206 core_ops
.to_sections_end
= NULL
;
213 core_close_cleanup (void *ignore
)
215 core_close (0/*ignored*/);
219 /* Stub function for catch_errors around shared library hacking. FROM_TTYP
220 is really an int * which points to from_tty. */
223 solib_add_stub (PTR from_ttyp
)
225 SOLIB_ADD (NULL
, *(int *) from_ttyp
, ¤t_target
);
226 re_enable_breakpoints_in_shlibs ();
229 #endif /* SOLIB_ADD */
231 /* Look for sections whose names start with `.reg/' so that we can extract the
232 list of threads in a core file. */
235 add_to_thread_list (bfd
*abfd
, asection
*asect
, PTR reg_sect_arg
)
238 asection
*reg_sect
= (asection
*) reg_sect_arg
;
240 if (strncmp (bfd_section_name (abfd
, asect
), ".reg/", 5) != 0)
243 thread_id
= atoi (bfd_section_name (abfd
, asect
) + 5);
245 add_thread (pid_to_ptid (thread_id
));
247 /* Warning, Will Robinson, looking at BFD private data! */
250 && asect
->filepos
== reg_sect
->filepos
) /* Did we find .reg? */
252 /* Needed to prevent regressions in ptid conversion phase 1. This
253 bit of code will be deleted in favor of the #else branch in
255 inferior_ptid
= thread_id
; /* Yes, make it current */
257 inferior_ptid
= pid_to_ptid (thread_id
); /* Yes, make it current */
261 /* This routine opens and sets up the core file bfd. */
264 core_open (char *filename
, int from_tty
)
268 struct cleanup
*old_chain
;
274 target_preopen (from_tty
);
278 "No core file specified. (Use `detach' to stop debugging a core file.)"
279 : "No core file specified.");
282 filename
= tilde_expand (filename
);
283 if (filename
[0] != '/')
285 temp
= concat (current_directory
, "/", filename
, NULL
);
290 old_chain
= make_cleanup (xfree
, filename
);
292 scratch_chan
= open (filename
, O_BINARY
| ( write_files
? O_RDWR
: O_RDONLY
), 0);
293 if (scratch_chan
< 0)
294 perror_with_name (filename
);
296 temp_bfd
= bfd_fdopenr (filename
, gnutarget
, scratch_chan
);
297 if (temp_bfd
== NULL
)
298 perror_with_name (filename
);
300 if (!bfd_check_format (temp_bfd
, bfd_core
) &&
301 !gdb_check_format (temp_bfd
))
303 /* Do it after the err msg */
304 /* FIXME: should be checking for errors from bfd_close (for one thing,
305 on error it does not free all the storage associated with the
307 make_cleanup_bfd_close (temp_bfd
);
308 error ("\"%s\" is not a core dump: %s",
309 filename
, bfd_errmsg (bfd_get_error ()));
312 /* Looks semi-reasonable. Toss the old core file and work on the new. */
314 discard_cleanups (old_chain
); /* Don't free filename any more */
315 unpush_target (&core_ops
);
317 old_chain
= make_cleanup (core_close_cleanup
, 0 /*ignore*/);
319 /* Find a suitable core file handler to munch on core_bfd */
320 core_vec
= sniff_core_bfd (core_bfd
);
324 /* Find the data section */
325 if (build_section_table (core_bfd
, &core_ops
.to_sections
,
326 &core_ops
.to_sections_end
))
327 error ("\"%s\": Can't find sections: %s",
328 bfd_get_filename (core_bfd
), bfd_errmsg (bfd_get_error ()));
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 (), 0);
368 print_stack_frame (selected_frame
, selected_frame_level
, 1);
373 "you won't be able to access this core file until you terminate\n\
374 your %s; do ``info files''", target_longname
);
379 core_detach (char *args
, int from_tty
)
382 error ("Too many arguments");
383 unpush_target (&core_ops
);
384 reinit_frame_cache ();
386 printf_filtered ("No core file now.\n");
390 /* Try to retrieve registers from a section in core_bfd, and supply
391 them to core_vec->core_read_registers, as the register set numbered
394 If inferior_ptid is zero, do the single-threaded thing: look for a
395 section named NAME. If inferior_ptid is non-zero, do the
396 multi-threaded thing: look for a section named "NAME/PID", where
397 PID is the shortest ASCII decimal representation of inferior_ptid.
399 HUMAN_NAME is a human-readable name for the kind of registers the
400 NAME section contains, for use in error messages.
402 If REQUIRED is non-zero, print an error if the core file doesn't
403 have a section by the appropriate name. Otherwise, just do nothing. */
406 get_core_register_section (char *name
,
411 char section_name
[100];
417 /* Needed to prevent regressions in ptid conversion phase 1. This
418 bit of code will be deleted in favor of the #else branch in
421 sprintf (section_name
, "%s/%d", name
, inferior_ptid
);
423 if (PIDGET (inferior_ptid
))
424 sprintf (section_name
, "%s/%d", name
, PIDGET (inferior_ptid
));
427 strcpy (section_name
, name
);
429 section
= bfd_get_section_by_name (core_bfd
, section_name
);
433 warning ("Couldn't find %s registers in core file.\n", human_name
);
437 size
= bfd_section_size (core_bfd
, section
);
438 contents
= alloca (size
);
439 if (! bfd_get_section_contents (core_bfd
, section
, contents
,
442 warning ("Couldn't read %s registers from `%s' section in core file.\n",
447 core_vec
->core_read_registers (contents
, size
, which
,
449 bfd_section_vma (core_bfd
, section
)));
453 /* Get the registers out of a core file. This is the machine-
454 independent part. Fetch_core_registers is the machine-dependent
455 part, typically implemented in the xm-file for each architecture. */
457 /* We just get all the registers, so we don't use regno. */
461 get_core_registers (int regno
)
466 || core_vec
->core_read_registers
== NULL
)
468 fprintf_filtered (gdb_stderr
,
469 "Can't fetch registers from this type of core file\n");
473 get_core_register_section (".reg", 0, "general-purpose", 1);
474 get_core_register_section (".reg2", 2, "floating-point", 0);
475 get_core_register_section (".reg-xfp", 3, "extended floating-point", 0);
477 registers_fetched ();
481 core_files_info (struct target_ops
*t
)
483 print_section_info (t
, core_bfd
);
486 /* If mourn is being called in all the right places, this could be say
487 `gdb internal error' (since generic_mourn calls breakpoint_init_inferior). */
490 ignore (CORE_ADDR addr
, char *contents
)
496 /* Okay, let's be honest: threads gleaned from a core file aren't
497 exactly lively, are they? On the other hand, if we don't claim
498 that each & every one is alive, then we don't get any of them
499 to appear in an "info thread" command, which is quite a useful
503 core_file_thread_alive (ptid_t tid
)
508 /* Fill in core_ops with its defined operations and properties. */
513 core_ops
.to_shortname
= "core";
514 core_ops
.to_longname
= "Local core dump file";
516 "Use a core file as a target. Specify the filename of the core file.";
517 core_ops
.to_open
= core_open
;
518 core_ops
.to_close
= core_close
;
519 core_ops
.to_attach
= find_default_attach
;
520 core_ops
.to_require_attach
= find_default_require_attach
;
521 core_ops
.to_detach
= core_detach
;
522 core_ops
.to_require_detach
= find_default_require_detach
;
523 core_ops
.to_fetch_registers
= get_core_registers
;
524 core_ops
.to_xfer_memory
= xfer_memory
;
525 core_ops
.to_files_info
= core_files_info
;
526 core_ops
.to_insert_breakpoint
= ignore
;
527 core_ops
.to_remove_breakpoint
= ignore
;
528 core_ops
.to_create_inferior
= find_default_create_inferior
;
529 core_ops
.to_clone_and_follow_inferior
= find_default_clone_and_follow_inferior
;
530 core_ops
.to_thread_alive
= core_file_thread_alive
;
531 core_ops
.to_stratum
= core_stratum
;
532 core_ops
.to_has_memory
= 1;
533 core_ops
.to_has_stack
= 1;
534 core_ops
.to_has_registers
= 1;
535 core_ops
.to_magic
= OPS_MAGIC
;
538 /* non-zero if we should not do the add_target call in
539 _initialize_corelow; not initialized (i.e., bss) so that
540 the target can initialize it (i.e., data) if appropriate.
541 This needs to be set at compile time because we don't know
542 for sure whether the target's initialize routine is called
543 before us or after us. */
544 int coreops_suppress_target
;
547 _initialize_corelow (void)
551 if (!coreops_suppress_target
)
552 add_target (&core_ops
);