Commit | Line | Data |
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8afd6ca5 | 1 | /* Core dump and executable file functions below target vector, for GDB. |
ba47c66a PS |
2 | Copyright 1986, 1987, 1989, 1991, 1992, 1993, 1994 |
3 | Free Software Foundation, Inc. | |
8afd6ca5 RP |
4 | |
5 | This file is part of GDB. | |
6 | ||
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. | |
11 | ||
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. | |
16 | ||
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., 675 Mass Ave, Cambridge, MA 02139, USA. */ | |
20 | ||
21 | #include "defs.h" | |
ba47c66a | 22 | #include <string.h> |
8afd6ca5 RP |
23 | #include <errno.h> |
24 | #include <signal.h> | |
25 | #include <fcntl.h> | |
26 | #include "frame.h" /* required by inferior.h */ | |
27 | #include "inferior.h" | |
28 | #include "symtab.h" | |
29 | #include "command.h" | |
30 | #include "bfd.h" | |
31 | #include "target.h" | |
32 | #include "gdbcore.h" | |
100f92e2 | 33 | #include "thread.h" |
8afd6ca5 RP |
34 | |
35 | static void | |
36 | core_files_info PARAMS ((struct target_ops *)); | |
37 | ||
38 | #ifdef SOLIB_ADD | |
39 | static int | |
40 | solib_add_stub PARAMS ((char *)); | |
41 | #endif | |
42 | ||
43 | static void | |
44 | core_close PARAMS ((int)); | |
45 | ||
46 | static void | |
47 | get_core_registers PARAMS ((int)); | |
48 | ||
49 | /* Discard all vestiges of any previous core file | |
50 | and mark data and stack spaces as empty. */ | |
51 | ||
52 | /* ARGSUSED */ | |
53 | static void | |
54 | core_close (quitting) | |
55 | int quitting; | |
56 | { | |
d113e6b2 SG |
57 | inferior_pid = 0; /* Avoid confusion from thread stuff */ |
58 | ||
8afd6ca5 RP |
59 | if (core_bfd) { |
60 | free (bfd_get_filename (core_bfd)); | |
61 | bfd_close (core_bfd); | |
62 | core_bfd = NULL; | |
63 | #ifdef CLEAR_SOLIB | |
64 | CLEAR_SOLIB (); | |
65 | #endif | |
66 | if (core_ops.to_sections) { | |
67 | free ((PTR)core_ops.to_sections); | |
68 | core_ops.to_sections = NULL; | |
69 | core_ops.to_sections_end = NULL; | |
70 | } | |
71 | } | |
72 | } | |
73 | ||
74 | #ifdef SOLIB_ADD | |
842cf831 JK |
75 | /* Stub function for catch_errors around shared library hacking. FROM_TTYP |
76 | is really an int * which points to from_tty. */ | |
8afd6ca5 RP |
77 | |
78 | static int | |
842cf831 JK |
79 | solib_add_stub (from_ttyp) |
80 | char *from_ttyp; | |
8afd6ca5 | 81 | { |
9137a6f4 | 82 | SOLIB_ADD (NULL, *(int *)from_ttyp, ¤t_target); |
26a859ec | 83 | return 0; |
8afd6ca5 RP |
84 | } |
85 | #endif /* SOLIB_ADD */ | |
86 | ||
d113e6b2 SG |
87 | /* Look for sections whose names start with `.reg/' so that we can extract the |
88 | list of threads in a core file. */ | |
89 | ||
90 | static void | |
7c5d526e | 91 | add_to_thread_list (abfd, asect, reg_sect_arg) |
d113e6b2 SG |
92 | bfd *abfd; |
93 | asection *asect; | |
7c5d526e | 94 | PTR reg_sect_arg; |
d113e6b2 SG |
95 | { |
96 | int thread_id; | |
4cc5b060 | 97 | asection *reg_sect = (asection *) reg_sect_arg; |
d113e6b2 SG |
98 | |
99 | if (strncmp (bfd_section_name (abfd, asect), ".reg/", 5) != 0) | |
100 | return; | |
101 | ||
102 | thread_id = atoi (bfd_section_name (abfd, asect) + 5); | |
103 | ||
104 | add_thread (thread_id); | |
105 | ||
106 | /* Warning, Will Robinson, looking at BFD private data! */ | |
107 | ||
108 | if (asect->filepos == reg_sect->filepos) /* Did we find .reg? */ | |
109 | inferior_pid = thread_id; /* Yes, make it current */ | |
110 | } | |
111 | ||
8afd6ca5 RP |
112 | /* This routine opens and sets up the core file bfd */ |
113 | ||
114 | void | |
115 | core_open (filename, from_tty) | |
116 | char *filename; | |
117 | int from_tty; | |
118 | { | |
119 | const char *p; | |
120 | int siggy; | |
121 | struct cleanup *old_chain; | |
122 | char *temp; | |
123 | bfd *temp_bfd; | |
124 | int ontop; | |
125 | int scratch_chan; | |
126 | ||
127 | target_preopen (from_tty); | |
128 | if (!filename) | |
129 | { | |
130 | error (core_bfd? | |
131 | "No core file specified. (Use `detach' to stop debugging a core file.)" | |
132 | : "No core file specified."); | |
133 | } | |
134 | ||
135 | filename = tilde_expand (filename); | |
136 | if (filename[0] != '/') { | |
137 | temp = concat (current_directory, "/", filename, NULL); | |
138 | free (filename); | |
139 | filename = temp; | |
140 | } | |
141 | ||
142 | old_chain = make_cleanup (free, filename); | |
143 | ||
144 | scratch_chan = open (filename, write_files? O_RDWR: O_RDONLY, 0); | |
145 | if (scratch_chan < 0) | |
146 | perror_with_name (filename); | |
147 | ||
0685d95f | 148 | temp_bfd = bfd_fdopenr (filename, gnutarget, scratch_chan); |
8afd6ca5 RP |
149 | if (temp_bfd == NULL) |
150 | { | |
151 | perror_with_name (filename); | |
152 | } | |
153 | ||
154 | if (!bfd_check_format (temp_bfd, bfd_core)) | |
155 | { | |
156 | /* Do it after the err msg */ | |
157 | make_cleanup (bfd_close, temp_bfd); | |
c4a081e1 | 158 | error ("\"%s\" is not a core dump: %s", filename, bfd_errmsg(bfd_get_error ())); |
8afd6ca5 RP |
159 | } |
160 | ||
161 | /* Looks semi-reasonable. Toss the old core file and work on the new. */ | |
162 | ||
163 | discard_cleanups (old_chain); /* Don't free filename any more */ | |
164 | unpush_target (&core_ops); | |
165 | core_bfd = temp_bfd; | |
166 | old_chain = make_cleanup (core_close, core_bfd); | |
167 | ||
168 | validate_files (); | |
169 | ||
170 | /* Find the data section */ | |
171 | if (build_section_table (core_bfd, &core_ops.to_sections, | |
172 | &core_ops.to_sections_end)) | |
173 | error ("Can't find sections in `%s': %s", bfd_get_filename(core_bfd), | |
c4a081e1 | 174 | bfd_errmsg (bfd_get_error ())); |
8afd6ca5 RP |
175 | |
176 | ontop = !push_target (&core_ops); | |
177 | discard_cleanups (old_chain); | |
178 | ||
179 | p = bfd_core_file_failing_command (core_bfd); | |
180 | if (p) | |
181 | printf_filtered ("Core was generated by `%s'.\n", p); | |
182 | ||
183 | siggy = bfd_core_file_failing_signal (core_bfd); | |
184 | if (siggy > 0) | |
185 | printf_filtered ("Program terminated with signal %d, %s.\n", siggy, | |
186 | safe_strsignal (siggy)); | |
187 | ||
d113e6b2 SG |
188 | /* Build up thread list from BFD sections. */ |
189 | ||
190 | init_thread_list (); | |
191 | bfd_map_over_sections (core_bfd, add_to_thread_list, | |
192 | bfd_get_section_by_name (core_bfd, ".reg")); | |
193 | ||
8afd6ca5 RP |
194 | if (ontop) { |
195 | /* Fetch all registers from core file */ | |
196 | target_fetch_registers (-1); | |
197 | ||
198 | /* Add symbols and section mappings for any shared libraries */ | |
199 | #ifdef SOLIB_ADD | |
842cf831 | 200 | catch_errors (solib_add_stub, &from_tty, (char *)0, |
9748446f | 201 | RETURN_MASK_ALL); |
9137a6f4 PS |
202 | |
203 | /* solib_add_stub usually modifies current_target.to_sections, which | |
204 | has to be reflected in core_ops to enable proper freeing of | |
205 | of the to_sections vector in core_close. */ | |
206 | core_ops.to_sections = current_target.to_sections; | |
8afd6ca5 RP |
207 | #endif |
208 | ||
209 | /* Now, set up the frame cache, and print the top of stack */ | |
85e07872 | 210 | set_current_frame (create_new_frame (read_fp (), |
8afd6ca5 RP |
211 | read_pc ())); |
212 | select_frame (get_current_frame (), 0); | |
213 | print_stack_frame (selected_frame, selected_frame_level, 1); | |
214 | } else { | |
215 | warning ( | |
216 | "you won't be able to access this core file until you terminate\n\ | |
cad1498f | 217 | your %s; do ``info files''", target_longname); |
8afd6ca5 RP |
218 | } |
219 | } | |
220 | ||
221 | void | |
222 | core_detach (args, from_tty) | |
223 | char *args; | |
224 | int from_tty; | |
225 | { | |
226 | if (args) | |
227 | error ("Too many arguments"); | |
228 | unpush_target (&core_ops); | |
c5198d93 | 229 | reinit_frame_cache (); |
8afd6ca5 RP |
230 | if (from_tty) |
231 | printf_filtered ("No core file now.\n"); | |
232 | } | |
233 | ||
234 | /* Get the registers out of a core file. This is the machine- | |
235 | independent part. Fetch_core_registers is the machine-dependent | |
236 | part, typically implemented in the xm-file for each architecture. */ | |
237 | ||
238 | /* We just get all the registers, so we don't use regno. */ | |
239 | /* ARGSUSED */ | |
240 | static void | |
241 | get_core_registers (regno) | |
242 | int regno; | |
243 | { | |
244 | sec_ptr reg_sec; | |
245 | unsigned size; | |
246 | char *the_regs; | |
d113e6b2 SG |
247 | char secname[10]; |
248 | ||
249 | /* Thread support. If inferior_pid is non-zero, then we have found a core | |
250 | file with threads (or multiple processes). In that case, we need to | |
251 | use the appropriate register section, else we just use `.reg'. */ | |
252 | ||
253 | /* XXX - same thing needs to be done for floating-point (.reg2) sections. */ | |
254 | ||
255 | if (inferior_pid) | |
256 | sprintf (secname, ".reg/%d", inferior_pid); | |
257 | else | |
258 | strcpy (secname, ".reg"); | |
8afd6ca5 | 259 | |
d113e6b2 | 260 | reg_sec = bfd_get_section_by_name (core_bfd, secname); |
8afd6ca5 RP |
261 | if (!reg_sec) goto cant; |
262 | size = bfd_section_size (core_bfd, reg_sec); | |
263 | the_regs = alloca (size); | |
264 | if (bfd_get_section_contents (core_bfd, reg_sec, the_regs, (file_ptr)0, size)) | |
265 | { | |
266 | fetch_core_registers (the_regs, size, 0, | |
267 | (unsigned) bfd_section_vma (abfd,reg_sec)); | |
268 | } | |
269 | else | |
270 | { | |
271 | cant: | |
199b2450 | 272 | fprintf_filtered (gdb_stderr, "Couldn't fetch registers from core file: %s\n", |
c4a081e1 | 273 | bfd_errmsg (bfd_get_error ())); |
8afd6ca5 RP |
274 | } |
275 | ||
276 | /* Now do it again for the float registers, if they exist. */ | |
277 | reg_sec = bfd_get_section_by_name (core_bfd, ".reg2"); | |
278 | if (reg_sec) { | |
279 | size = bfd_section_size (core_bfd, reg_sec); | |
280 | the_regs = alloca (size); | |
281 | if (bfd_get_section_contents (core_bfd, reg_sec, the_regs, (file_ptr)0, | |
282 | size)) | |
283 | { | |
284 | fetch_core_registers (the_regs, size, 2, | |
285 | (unsigned) bfd_section_vma (abfd,reg_sec)); | |
286 | } | |
287 | else | |
288 | { | |
199b2450 | 289 | fprintf_filtered (gdb_stderr, "Couldn't fetch register set 2 from core file: %s\n", |
c4a081e1 | 290 | bfd_errmsg (bfd_get_error ())); |
8afd6ca5 RP |
291 | } |
292 | } | |
293 | registers_fetched(); | |
294 | } | |
295 | ||
296 | static void | |
297 | core_files_info (t) | |
298 | struct target_ops *t; | |
299 | { | |
300 | print_section_info (t, core_bfd); | |
301 | } | |
302 | \f | |
f47e56c9 | 303 | /* If mourn is being called in all the right places, this could be say |
cf3e377e | 304 | `gdb internal error' (since generic_mourn calls breakpoint_init_inferior). */ |
f47e56c9 JK |
305 | |
306 | static int | |
307 | ignore (addr, contents) | |
308 | CORE_ADDR addr; | |
309 | char *contents; | |
310 | { | |
100f92e2 | 311 | return 0; |
f47e56c9 JK |
312 | } |
313 | ||
8afd6ca5 RP |
314 | struct target_ops core_ops = { |
315 | "core", "Local core dump file", | |
316 | "Use a core file as a target. Specify the filename of the core file.", | |
317 | core_open, core_close, | |
318 | find_default_attach, core_detach, 0, 0, /* resume, wait */ | |
319 | get_core_registers, | |
320 | 0, 0, /* store_regs, prepare_to_store */ | |
321 | xfer_memory, core_files_info, | |
f47e56c9 | 322 | ignore, ignore, /* core_insert_breakpoint, core_remove_breakpoint, */ |
8afd6ca5 RP |
323 | 0, 0, 0, 0, 0, /* terminal stuff */ |
324 | 0, 0, 0, /* kill, load, lookup sym */ | |
325 | find_default_create_inferior, 0, /* mourn_inferior */ | |
326 | 0, /* can_run */ | |
3950a34e | 327 | 0, /* notice_signals */ |
8afd6ca5 RP |
328 | core_stratum, 0, /* next */ |
329 | 0, 1, 1, 1, 0, /* all mem, mem, stack, regs, exec */ | |
330 | 0, 0, /* section pointers */ | |
331 | OPS_MAGIC, /* Always the last thing */ | |
332 | }; | |
333 | ||
334 | void | |
335 | _initialize_corelow() | |
336 | { | |
337 | add_target (&core_ops); | |
338 | } |