1 /* Core dump and executable file functions below target vector, for GDB.
2 Copyright 1986, 1987, 1989, 1991, 1992 Free Software Foundation, Inc.
4 This file is part of GDB.
6 This program 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 2 of the License, or
9 (at your option) any later version.
11 This program 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 this program; if not, write to the Free Software
18 Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA. */
24 #include "frame.h" /* required by inferior.h */
33 core_files_info PARAMS ((struct target_ops *));
37 solib_add_stub PARAMS ((char *));
41 core_close PARAMS ((int));
44 get_core_registers PARAMS ((int));
46 /* Discard all vestiges of any previous core file
47 and mark data and stack spaces as empty. */
54 inferior_pid = 0; /* Avoid confusion from thread stuff */
57 free (bfd_get_filename (core_bfd));
63 if (core_ops.to_sections) {
64 free ((PTR)core_ops.to_sections);
65 core_ops.to_sections = NULL;
66 core_ops.to_sections_end = NULL;
72 /* Stub function for catch_errors around shared library hacking. */
75 solib_add_stub (from_tty)
78 SOLIB_ADD (NULL, (int)from_tty, &core_ops);
81 #endif /* SOLIB_ADD */
83 /* Look for sections whose names start with `.reg/' so that we can extract the
84 list of threads in a core file. */
87 add_to_thread_list (abfd, asect, reg_sect)
94 if (strncmp (bfd_section_name (abfd, asect), ".reg/", 5) != 0)
97 thread_id = atoi (bfd_section_name (abfd, asect) + 5);
99 add_thread (thread_id);
101 /* Warning, Will Robinson, looking at BFD private data! */
103 if (asect->filepos == reg_sect->filepos) /* Did we find .reg? */
104 inferior_pid = thread_id; /* Yes, make it current */
107 /* This routine opens and sets up the core file bfd */
110 core_open (filename, from_tty)
116 struct cleanup *old_chain;
122 target_preopen (from_tty);
126 "No core file specified. (Use `detach' to stop debugging a core file.)"
127 : "No core file specified.");
130 filename = tilde_expand (filename);
131 if (filename[0] != '/') {
132 temp = concat (current_directory, "/", filename, NULL);
137 old_chain = make_cleanup (free, filename);
139 scratch_chan = open (filename, write_files? O_RDWR: O_RDONLY, 0);
140 if (scratch_chan < 0)
141 perror_with_name (filename);
143 temp_bfd = bfd_fdopenr (filename, gnutarget, scratch_chan);
144 if (temp_bfd == NULL)
146 perror_with_name (filename);
149 if (!bfd_check_format (temp_bfd, bfd_core))
151 /* Do it after the err msg */
152 make_cleanup (bfd_close, temp_bfd);
153 error ("\"%s\" is not a core dump: %s", filename, bfd_errmsg(bfd_error));
156 /* Looks semi-reasonable. Toss the old core file and work on the new. */
158 discard_cleanups (old_chain); /* Don't free filename any more */
159 unpush_target (&core_ops);
161 old_chain = make_cleanup (core_close, core_bfd);
165 /* Find the data section */
166 if (build_section_table (core_bfd, &core_ops.to_sections,
167 &core_ops.to_sections_end))
168 error ("Can't find sections in `%s': %s", bfd_get_filename(core_bfd),
169 bfd_errmsg (bfd_error));
171 ontop = !push_target (&core_ops);
172 discard_cleanups (old_chain);
174 p = bfd_core_file_failing_command (core_bfd);
176 printf_filtered ("Core was generated by `%s'.\n", p);
178 siggy = bfd_core_file_failing_signal (core_bfd);
180 printf_filtered ("Program terminated with signal %d, %s.\n", siggy,
181 safe_strsignal (siggy));
183 /* Build up thread list from BFD sections. */
186 bfd_map_over_sections (core_bfd, add_to_thread_list,
187 bfd_get_section_by_name (core_bfd, ".reg"));
190 /* Fetch all registers from core file */
191 target_fetch_registers (-1);
193 /* Add symbols and section mappings for any shared libraries */
195 catch_errors (solib_add_stub, (char *)from_tty, (char *)0,
199 /* Now, set up the frame cache, and print the top of stack */
200 set_current_frame (create_new_frame (read_fp (),
202 select_frame (get_current_frame (), 0);
203 print_stack_frame (selected_frame, selected_frame_level, 1);
206 "you won't be able to access this core file until you terminate\n\
207 your %s; do ``info files''", current_target->to_longname);
212 core_detach (args, from_tty)
217 error ("Too many arguments");
218 unpush_target (&core_ops);
219 reinit_frame_cache ();
221 printf_filtered ("No core file now.\n");
224 /* Get the registers out of a core file. This is the machine-
225 independent part. Fetch_core_registers is the machine-dependent
226 part, typically implemented in the xm-file for each architecture. */
228 /* We just get all the registers, so we don't use regno. */
231 get_core_registers (regno)
239 /* Thread support. If inferior_pid is non-zero, then we have found a core
240 file with threads (or multiple processes). In that case, we need to
241 use the appropriate register section, else we just use `.reg'. */
243 /* XXX - same thing needs to be done for floating-point (.reg2) sections. */
246 sprintf (secname, ".reg/%d", inferior_pid);
248 strcpy (secname, ".reg");
250 reg_sec = bfd_get_section_by_name (core_bfd, secname);
251 if (!reg_sec) goto cant;
252 size = bfd_section_size (core_bfd, reg_sec);
253 the_regs = alloca (size);
254 if (bfd_get_section_contents (core_bfd, reg_sec, the_regs, (file_ptr)0, size))
256 fetch_core_registers (the_regs, size, 0,
257 (unsigned) bfd_section_vma (abfd,reg_sec));
262 fprintf_filtered (stderr, "Couldn't fetch registers from core file: %s\n",
263 bfd_errmsg (bfd_error));
266 /* Now do it again for the float registers, if they exist. */
267 reg_sec = bfd_get_section_by_name (core_bfd, ".reg2");
269 size = bfd_section_size (core_bfd, reg_sec);
270 the_regs = alloca (size);
271 if (bfd_get_section_contents (core_bfd, reg_sec, the_regs, (file_ptr)0,
274 fetch_core_registers (the_regs, size, 2,
275 (unsigned) bfd_section_vma (abfd,reg_sec));
279 fprintf_filtered (stderr, "Couldn't fetch register set 2 from core file: %s\n",
280 bfd_errmsg (bfd_error));
288 struct target_ops *t;
290 print_section_info (t, core_bfd);
293 /* If mourn is being called in all the right places, this could be say
294 `gdb internal error' (since generic_mourn calls mark_breakpoints_out). */
297 ignore (addr, contents)
303 struct target_ops core_ops = {
304 "core", "Local core dump file",
305 "Use a core file as a target. Specify the filename of the core file.",
306 core_open, core_close,
307 find_default_attach, core_detach, 0, 0, /* resume, wait */
309 0, 0, /* store_regs, prepare_to_store */
310 xfer_memory, core_files_info,
311 ignore, ignore, /* core_insert_breakpoint, core_remove_breakpoint, */
312 0, 0, 0, 0, 0, /* terminal stuff */
313 0, 0, 0, /* kill, load, lookup sym */
314 find_default_create_inferior, 0, /* mourn_inferior */
316 0, /* notice_signals */
317 core_stratum, 0, /* next */
318 0, 1, 1, 1, 0, /* all mem, mem, stack, regs, exec */
319 0, 0, /* section pointers */
320 OPS_MAGIC, /* Always the last thing */
324 _initialize_corelow()
326 add_target (&core_ops);