1 /* Core dump and executable file functions below target vector, for GDB.
2 Copyright 1986, 1987, 1989, 1991, 1992, 1993, 1994, 1995
3 Free Software Foundation, Inc.
5 This file is part of GDB.
7 This program is free software; you can redistribute it and/or modify
8 it under the terms of the GNU General Public License as published by
9 the Free Software Foundation; either version 2 of the License, or
10 (at your option) any later version.
12 This program is distributed in the hope that it will be useful,
13 but WITHOUT ANY WARRANTY; without even the implied warranty of
14 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
15 GNU General Public License for more details.
17 You should have received a copy of the GNU General Public License
18 along with this program; if not, write to the Free Software
19 Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA. */
22 #include "gdb_string.h"
26 #include "frame.h" /* required by inferior.h */
35 /* List of all available core_fns. On gdb startup, each core file register
36 reader calls add_core_fns() to register information on each core format it
37 is prepared to read. */
39 static struct core_fns *core_file_fns = NULL;
41 static void core_files_info PARAMS ((struct target_ops *));
44 static int solib_add_stub PARAMS ((char *));
47 static void core_open PARAMS ((char *, int));
49 static void core_detach PARAMS ((char *, int));
51 static void core_close PARAMS ((int));
53 static void get_core_registers PARAMS ((int));
55 /* Link a new core_fns into the global core_file_fns list. Called on gdb
56 startup by the _initialize routine in each core file register reader, to
57 register information about each format the the reader is prepared to
64 cf -> next = core_file_fns;
69 /* Discard all vestiges of any previous core file and mark data and stack
79 inferior_pid = 0; /* Avoid confusion from thread stuff */
83 name = bfd_get_filename (core_bfd);
84 if (!bfd_close (core_bfd))
85 warning ("cannot close \"%s\": %s",
86 name, bfd_errmsg (bfd_get_error ()));
92 if (core_ops.to_sections)
94 free ((PTR)core_ops.to_sections);
95 core_ops.to_sections = NULL;
96 core_ops.to_sections_end = NULL;
102 /* Stub function for catch_errors around shared library hacking. FROM_TTYP
103 is really an int * which points to from_tty. */
106 solib_add_stub (from_ttyp)
109 SOLIB_ADD (NULL, *(int *)from_ttyp, ¤t_target);
112 #endif /* SOLIB_ADD */
114 /* Look for sections whose names start with `.reg/' so that we can extract the
115 list of threads in a core file. */
118 add_to_thread_list (abfd, asect, reg_sect_arg)
124 asection *reg_sect = (asection *) reg_sect_arg;
126 if (strncmp (bfd_section_name (abfd, asect), ".reg/", 5) != 0)
129 thread_id = atoi (bfd_section_name (abfd, asect) + 5);
131 add_thread (thread_id);
133 /* Warning, Will Robinson, looking at BFD private data! */
135 if (asect->filepos == reg_sect->filepos) /* Did we find .reg? */
136 inferior_pid = thread_id; /* Yes, make it current */
139 /* This routine opens and sets up the core file bfd. */
142 core_open (filename, from_tty)
148 struct cleanup *old_chain;
154 target_preopen (from_tty);
158 "No core file specified. (Use `detach' to stop debugging a core file.)"
159 : "No core file specified.");
162 filename = tilde_expand (filename);
163 if (filename[0] != '/')
165 temp = concat (current_directory, "/", filename, NULL);
170 old_chain = make_cleanup (free, filename);
172 scratch_chan = open (filename, write_files ? O_RDWR : O_RDONLY, 0);
173 if (scratch_chan < 0)
174 perror_with_name (filename);
176 temp_bfd = bfd_fdopenr (filename, gnutarget, scratch_chan);
177 if (temp_bfd == NULL)
178 perror_with_name (filename);
180 if (!bfd_check_format (temp_bfd, bfd_core))
182 /* Do it after the err msg */
183 /* FIXME: should be checking for errors from bfd_close (for one thing,
184 on error it does not free all the storage associated with the
186 make_cleanup (bfd_close, temp_bfd);
187 error ("\"%s\" is not a core dump: %s",
188 filename, bfd_errmsg (bfd_get_error ()));
191 /* Looks semi-reasonable. Toss the old core file and work on the new. */
193 discard_cleanups (old_chain); /* Don't free filename any more */
194 unpush_target (&core_ops);
196 old_chain = make_cleanup (core_close, core_bfd);
200 /* Find the data section */
201 if (build_section_table (core_bfd, &core_ops.to_sections,
202 &core_ops.to_sections_end))
203 error ("\"%s\": Can't find sections: %s",
204 bfd_get_filename (core_bfd), bfd_errmsg (bfd_get_error ()));
206 ontop = !push_target (&core_ops);
207 discard_cleanups (old_chain);
209 p = bfd_core_file_failing_command (core_bfd);
211 printf_filtered ("Core was generated by `%s'.\n", p);
213 siggy = bfd_core_file_failing_signal (core_bfd);
215 printf_filtered ("Program terminated with signal %d, %s.\n", siggy,
216 safe_strsignal (siggy));
218 /* Build up thread list from BFD sections. */
221 bfd_map_over_sections (core_bfd, add_to_thread_list,
222 bfd_get_section_by_name (core_bfd, ".reg"));
226 /* Fetch all registers from core file. */
227 target_fetch_registers (-1);
229 /* Add symbols and section mappings for any shared libraries. */
231 catch_errors (solib_add_stub, &from_tty, (char *)0,
235 /* Now, set up the frame cache, and print the top of stack. */
236 flush_cached_frames ();
237 select_frame (get_current_frame (), 0);
238 print_stack_frame (selected_frame, selected_frame_level, 1);
243 "you won't be able to access this core file until you terminate\n\
244 your %s; do ``info files''", target_longname);
249 core_detach (args, from_tty)
254 error ("Too many arguments");
255 unpush_target (&core_ops);
256 reinit_frame_cache ();
258 printf_filtered ("No core file now.\n");
261 /* Get the registers out of a core file. This is the machine-
262 independent part. Fetch_core_registers is the machine-dependent
263 part, typically implemented in the xm-file for each architecture. */
265 /* We just get all the registers, so we don't use regno. */
269 get_core_registers (regno)
276 enum bfd_flavour our_flavour = bfd_get_flavour (core_bfd);
279 if (core_file_fns == NULL)
281 fprintf_filtered (gdb_stderr,
282 "Can't fetch registers from this type of core file\n");
286 /* Thread support. If inferior_pid is non-zero, then we have found a core
287 file with threads (or multiple processes). In that case, we need to
288 use the appropriate register section, else we just use `.reg'. */
290 /* XXX - same thing needs to be done for floating-point (.reg2) sections. */
293 sprintf (secname, ".reg/%d", inferior_pid);
295 strcpy (secname, ".reg");
297 reg_sec = bfd_get_section_by_name (core_bfd, secname);
300 size = bfd_section_size (core_bfd, reg_sec);
301 the_regs = alloca (size);
302 /* Look for the core functions that match this flavor. Default to the
303 first one if nothing matches. */
304 for (cf = core_file_fns; cf != NULL; cf = cf -> next)
306 if (our_flavour == cf -> core_flavour)
316 bfd_get_section_contents (core_bfd, reg_sec, the_regs, (file_ptr)0, size) &&
317 cf -> core_read_registers != NULL)
319 (cf -> core_read_registers (the_regs, size, 0,
320 (unsigned) bfd_section_vma (abfd,reg_sec)));
325 fprintf_filtered (gdb_stderr,
326 "Couldn't fetch registers from core file: %s\n",
327 bfd_errmsg (bfd_get_error ()));
330 /* Now do it again for the float registers, if they exist. */
331 reg_sec = bfd_get_section_by_name (core_bfd, ".reg2");
334 size = bfd_section_size (core_bfd, reg_sec);
335 the_regs = alloca (size);
337 bfd_get_section_contents (core_bfd, reg_sec, the_regs, (file_ptr)0, size) &&
338 cf -> core_read_registers != NULL)
340 (cf -> core_read_registers (the_regs, size, 2,
341 (unsigned) bfd_section_vma (abfd,reg_sec)));
345 fprintf_filtered (gdb_stderr,
346 "Couldn't fetch register set 2 from core file: %s\n",
347 bfd_errmsg (bfd_get_error ()));
350 registers_fetched ();
355 struct target_ops *t;
357 print_section_info (t, core_bfd);
360 /* If mourn is being called in all the right places, this could be say
361 `gdb internal error' (since generic_mourn calls breakpoint_init_inferior). */
364 ignore (addr, contents)
371 struct target_ops core_ops = {
372 "core", /* to_shortname */
373 "Local core dump file", /* to_longname */
374 "Use a core file as a target. Specify the filename of the core file.", /* to_doc */
375 core_open, /* to_open */
376 core_close, /* to_close */
377 find_default_attach, /* to_attach */
378 core_detach, /* to_detach */
381 get_core_registers, /* to_fetch_registers */
382 0, /* to_store_registers */
383 0, /* to_prepare_to_store */
384 xfer_memory, /* to_xfer_memory */
385 core_files_info, /* to_files_info */
386 ignore, /* to_insert_breakpoint */
387 ignore, /* to_remove_breakpoint */
388 0, /* to_terminal_init */
389 0, /* to_terminal_inferior */
390 0, /* to_terminal_ours_for_output */
391 0, /* to_terminal_ours */
392 0, /* to_terminal_info */
395 0, /* to_lookup_symbol */
396 find_default_create_inferior, /* to_create_inferior */
397 0, /* to_mourn_inferior */
399 0, /* to_notice_signals */
400 0, /* to_thread_alive */
402 core_stratum, /* to_stratum */
404 0, /* to_has_all_memory */
405 1, /* to_has_memory */
406 1, /* to_has_stack */
407 1, /* to_has_registers */
408 0, /* to_has_execution */
410 0, /* to_sections_end */
411 OPS_MAGIC, /* to_magic */
415 _initialize_corelow()
417 add_target (&core_ops);