1 /* Work with core dump and executable files, for GDB.
2 Copyright (C) 1986, 1987, 1989 Free Software Foundation, Inc.
4 This file is part of GDB.
6 GDB is free software; you can redistribute it and/or modify
7 it under the terms of the GNU General Public License as published by
8 the Free Software Foundation; either version 1, or (at your option)
11 GDB is distributed in the hope that it will be useful,
12 but WITHOUT ANY WARRANTY; without even the implied warranty of
13 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
14 GNU General Public License for more details.
16 You should have received a copy of the GNU General Public License
17 along with GDB; see the file COPYING. If not, write to
18 the Free Software Foundation, 675 Mass Ave, Cambridge, MA 02139, USA. */
25 #include "frame.h" /* required by inferior.h */
33 extern int xfer_memory ();
34 extern void child_attach (), child_create_inferior ();
37 extern char *sys_errlist
[];
38 extern char *sys_siglist
[];
40 extern char registers
[];
42 /* Hook for `exec_file_command' command to call. */
44 void (*exec_file_display_hook
) () = NULL
;
46 struct section_table
*core_sections
, *core_sections_end
;
48 /* Binary file diddling handle for the core file. */
53 extern struct target_ops core_ops
;
56 /* Discard all vestiges of any previous core file
57 and mark data and stack spaces as empty. */
64 free (bfd_get_filename (core_bfd
));
70 /* This routine opens and sets up the core file bfd */
73 core_open (filename
, from_tty
)
79 struct cleanup
*old_chain
;
87 "No core file specified. (Use `detach' to stop debugging a core file.)"
88 : "No core file specified.");
91 filename
= tilde_expand (filename
);
92 if (filename
[0] != '/') {
93 temp
= concat (current_directory
, "/", filename
);
98 old_chain
= make_cleanup (free
, filename
);
99 temp_bfd
= bfd_openr (filename
, NULL
);
100 if (temp_bfd
== NULL
)
102 perror_with_name (filename
);
105 if (!bfd_check_format (temp_bfd
, bfd_core
))
107 bfd_close (temp_bfd
);
108 error ("\"%s\" does not appear to be a core dump", filename
);
111 /* Looks semi-reasonable. Toss the old core file and work on the new. */
113 discard_cleanups (old_chain
); /* Don't free filename any more */
114 unpush_target (&core_ops
);
116 old_chain
= make_cleanup (core_close
, core_bfd
);
120 /* Find the data section */
121 if (build_section_table (core_bfd
, &core_sections
, &core_sections_end
))
122 error ("Can't find sections in `%s': %s", bfd_get_filename(core_bfd
),
123 bfd_errmsg (bfd_error
));
125 ontop
= !push_target (&core_ops
);
127 p
= bfd_core_file_failing_command (core_bfd
);
129 printf ("Core file invoked as `%s'.\n", p
);
131 siggy
= bfd_core_file_failing_signal (core_bfd
);
133 printf ("Program terminated with signal %d, %s.\n", siggy
,
134 siggy
< NSIG
? sys_siglist
[siggy
] : "(undocumented)");
137 /* Fetch all registers from core file */
138 target_fetch_registers (-1);
139 set_current_frame ( create_new_frame (read_register (FP_REGNUM
),
141 select_frame (get_current_frame (), 0);
142 /* FIXME, handle shared library reading here. */
143 print_sel_frame (0); /* Print the top frame and source line */
146 "Warning: you won't be able to access this core file until you terminate\n\
147 your %s; do ``info files''\n", current_target
->to_longname
);
150 discard_cleanups (old_chain
);
154 core_detach (args
, from_tty
)
159 error ("Too many arguments");
160 unpush_target (&core_ops
);
162 printf ("No core file now.\n");
165 /* Backward compatability with old way of specifying core files. */
168 core_file_command (filename
, from_tty
)
172 dont_repeat (); /* Either way, seems bogus. */
174 core_detach (filename
, from_tty
);
176 core_open (filename
, from_tty
);
180 /* Call this to specify the hook for exec_file_command to call back.
181 This is called from the x-window display code. */
184 specify_exec_file_hook (hook
)
187 exec_file_display_hook
= hook
;
190 /* The exec file must be closed before running an inferior.
191 If it is needed again after the inferior dies, it must
199 bfd_tempclose (exec_bfd
);
208 bfd_reopen (exec_bfd
);
212 /* If we have both a core file and an exec file,
213 print a warning if they don't go together.
214 This should really check that the core file came
215 from that exec file, but I don't know how to do it. */
220 if (exec_bfd
&& core_bfd
)
222 if (core_file_matches_executable_p (core_bfd
, exec_bfd
))
223 printf ("Warning: core file does not match specified executable file.\n");
224 else if (bfd_get_mtime(exec_bfd
) > bfd_get_mtime(core_bfd
))
225 printf ("Warning: exec file is newer than core file.\n");
229 /* Return the name of the executable file as a string.
230 ERR nonzero means get error if there is none specified;
231 otherwise return 0 in that case. */
237 if (exec_bfd
) return bfd_get_filename(exec_bfd
);
238 if (!err
) return NULL
;
240 error ("No executable file specified.\n\
241 Use the \"file\" or \"exec-file\" command.");
248 struct section_table
*p
;
250 printf ("\tCore file `%s'.\n", bfd_get_filename(core_bfd
));
252 for (p
= core_sections
; p
< core_sections_end
; p
++)
253 printf("\tcore file from 0x%08x to 0x%08x is %s\n",
255 bfd_section_name (core_bfd
, p
->sec_ptr
));
259 memory_error (status
, memaddr
)
266 /* Actually, address between memaddr and memaddr + len
267 was out of bounds. */
268 error ("Cannot access memory: address 0x%x out of bounds.", memaddr
);
272 if (status
>= sys_nerr
|| status
< 0)
273 error ("Error accessing memory address 0x%x: unknown error (%d).",
276 error ("Error accessing memory address 0x%x: %s.",
277 memaddr
, sys_errlist
[status
]);
281 /* Same as target_read_memory, but report an error if can't read. */
283 read_memory (memaddr
, myaddr
, len
)
289 status
= target_read_memory (memaddr
, myaddr
, len
);
291 memory_error (status
, memaddr
);
294 /* Same as target_write_memory, but report an error if can't write. */
296 write_memory (memaddr
, myaddr
, len
)
303 status
= target_write_memory (memaddr
, myaddr
, len
);
305 memory_error (status
, memaddr
);
308 /* Read an integer from debugged memory, given address and number of bytes. */
311 read_memory_integer (memaddr
, len
)
320 if (len
== sizeof (char))
322 read_memory (memaddr
, &cbuf
, len
);
325 if (len
== sizeof (short))
327 read_memory (memaddr
, (char *)&sbuf
, len
);
328 SWAP_TARGET_AND_HOST (&sbuf
, sizeof (short));
331 if (len
== sizeof (int))
333 read_memory (memaddr
, (char *)&ibuf
, len
);
334 SWAP_TARGET_AND_HOST (&ibuf
, sizeof (int));
337 if (len
== sizeof (lbuf
))
339 read_memory (memaddr
, (char *)&lbuf
, len
);
340 SWAP_TARGET_AND_HOST (&lbuf
, sizeof (lbuf
));
343 error ("Cannot handle integers of %d bytes.", len
);
344 return -1; /* for lint */
347 /* Read or write the core file.
349 Args are address within core file, address within gdb address-space,
350 length, and a flag indicating whether to read or write.
354 0: We cannot handle this address and length.
355 > 0: We have handled N bytes starting at this address.
356 (If N == length, we did it all.) We might be able
357 to handle more bytes beyond this length, but no
359 < 0: We cannot handle this address, but if somebody
360 else handles (-N) bytes, we can start from there.
362 The actual work is done by xfer_memory in exec.c, which we share
363 in common with exec_xfer_memory(). */
366 core_xfer_memory (memaddr
, myaddr
, len
, write
)
372 return xfer_memory (memaddr
, myaddr
, len
, write
,
373 core_bfd
, core_sections
, core_sections_end
);
376 /* Get the registers out of a core file. This is the machine-
377 independent part. Fetch_core_registers is the machine-dependent
378 part, typically implemented in the xm-file for each architecture. */
381 get_core_registers (regno
)
388 reg_sec
= bfd_get_section_by_name (core_bfd
, ".reg");
389 size
= bfd_section_size (core_bfd
, reg_sec
);
390 the_regs
= alloca (size
);
391 if (bfd_get_section_contents (core_bfd
, reg_sec
, the_regs
,
394 fetch_core_registers (the_regs
, size
, 0);
398 fprintf (stderr
, "Couldn't fetch registers from core file: %s\n",
399 bfd_errmsg (bfd_error
));
402 /* Now do it again for the float registers, if they exist. */
403 reg_sec
= bfd_get_section_by_name (core_bfd
, ".reg2");
405 size
= bfd_section_size (core_bfd
, reg_sec
);
406 the_regs
= alloca (size
);
407 if (bfd_get_section_contents (core_bfd
, reg_sec
, the_regs
,
410 fetch_core_registers (the_regs
, size
, 2);
414 fprintf (stderr
, "Couldn't fetch register set 2 from core file: %s\n",
415 bfd_errmsg (bfd_error
));
419 return 0; /* FIXME, what result goes here? */
422 struct target_ops core_ops
= {
423 "core", "Local core dump file",
424 core_open
, core_close
,
425 child_attach
, core_detach
, 0, 0, /* resume, wait */
427 0, 0, 0, 0, /* store_regs, prepare_to_store, conv_to, conv_from */
428 core_xfer_memory
, core_files_info
,
429 0, 0, /* core_insert_breakpoint, core_remove_breakpoint, */
430 0, 0, 0, 0, 0, /* terminal stuff */
431 0, 0, 0, 0, 0, /* kill, load, add_syms, call fn, lookup sym */
432 child_create_inferior
, 0, /* mourn_inferior */
433 core_stratum
, 0, /* next */
434 0, 1, 1, 1, 0, /* all mem, mem, stack, regs, exec */
435 OPS_MAGIC
, /* Always the last thing */
442 add_com ("core-file", class_files
, core_file_command
,
443 "Use FILE as core dump for examining memory and registers.\n\
444 No arg means have no core file. This command has been superseded by the\n\
445 `target core' and `detach' commands.");
446 add_target (&core_ops
);
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