* target.h: Add enum target_waitkind, enum target_signal, and
[deliverable/binutils-gdb.git] / gdb / core.c
1 /* Core dump and executable file functions above target vector, for GDB.
2 Copyright 1986, 1987, 1989, 1991, 1992 Free Software Foundation, Inc.
3
4 This file is part of GDB.
5
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.
10
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.
15
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. */
19
20 #include "defs.h"
21 #include <errno.h>
22 #include <signal.h>
23 #include <fcntl.h>
24 #include "frame.h" /* required by inferior.h */
25 #include "inferior.h"
26 #include "symtab.h"
27 #include "command.h"
28 #include "gdbcmd.h"
29 #include "bfd.h"
30 #include "target.h"
31 #include "gdbcore.h"
32 #include "dis-asm.h"
33 #include "language.h"
34
35 extern char registers[];
36
37 /* Hook for `exec_file_command' command to call. */
38
39 void (*exec_file_display_hook) PARAMS ((char *)) = NULL;
40
41 /* Binary file diddling handle for the core file. */
42
43 bfd *core_bfd = NULL;
44
45 \f
46 /* Backward compatability with old way of specifying core files. */
47
48 void
49 core_file_command (filename, from_tty)
50 char *filename;
51 int from_tty;
52 {
53 struct target_ops *t;
54
55 dont_repeat (); /* Either way, seems bogus. */
56
57 t = find_core_target ();
58 if (t != NULL)
59 if (!filename)
60 (t->to_detach) (filename, from_tty);
61 else
62 (t->to_open) (filename, from_tty);
63 else
64 error ("GDB can't read core files on this machine.");
65 }
66
67 \f
68 /* Call this to specify the hook for exec_file_command to call back.
69 This is called from the x-window display code. */
70
71 void
72 specify_exec_file_hook (hook)
73 void (*hook) PARAMS ((char *));
74 {
75 exec_file_display_hook = hook;
76 }
77
78 /* The exec file must be closed before running an inferior.
79 If it is needed again after the inferior dies, it must
80 be reopened. */
81
82 void
83 close_exec_file ()
84 {
85 #ifdef FIXME
86 if (exec_bfd)
87 bfd_tempclose (exec_bfd);
88 #endif
89 }
90
91 void
92 reopen_exec_file ()
93 {
94 #ifdef FIXME
95 if (exec_bfd)
96 bfd_reopen (exec_bfd);
97 #endif
98 }
99 \f
100 /* If we have both a core file and an exec file,
101 print a warning if they don't go together. */
102
103 void
104 validate_files ()
105 {
106 if (exec_bfd && core_bfd)
107 {
108 if (!core_file_matches_executable_p (core_bfd, exec_bfd))
109 warning ("core file may not match specified executable file.");
110 else if (bfd_get_mtime(exec_bfd) > bfd_get_mtime(core_bfd))
111 warning ("exec file is newer than core file.");
112 }
113 }
114
115 /* Return the name of the executable file as a string.
116 ERR nonzero means get error if there is none specified;
117 otherwise return 0 in that case. */
118
119 char *
120 get_exec_file (err)
121 int err;
122 {
123 if (exec_bfd) return bfd_get_filename(exec_bfd);
124 if (!err) return NULL;
125
126 error ("No executable file specified.\n\
127 Use the \"file\" or \"exec-file\" command.");
128 return NULL;
129 }
130
131 \f
132 /* Report a memory error with error(). */
133
134 void
135 memory_error (status, memaddr)
136 int status;
137 CORE_ADDR memaddr;
138 {
139
140 if (status == EIO)
141 {
142 /* Actually, address between memaddr and memaddr + len
143 was out of bounds. */
144 error ("Cannot access memory at address %s.",
145 local_hex_string((unsigned long) memaddr));
146 }
147 else
148 {
149 error ("Error accessing memory address %s: %s.",
150 local_hex_string ((unsigned long) memaddr),
151 safe_strerror (status));
152 }
153 }
154
155 /* Same as target_read_memory, but report an error if can't read. */
156 void
157 read_memory (memaddr, myaddr, len)
158 CORE_ADDR memaddr;
159 char *myaddr;
160 int len;
161 {
162 int status;
163 status = target_read_memory (memaddr, myaddr, len);
164 if (status != 0)
165 memory_error (status, memaddr);
166 }
167
168 /* Like target_read_memory, but slightly different parameters. */
169
170 int
171 dis_asm_read_memory (memaddr, myaddr, len, info)
172 bfd_vma memaddr;
173 bfd_byte *myaddr;
174 int len;
175 disassemble_info *info;
176 {
177 return target_read_memory (memaddr, (char *) myaddr, len);
178 }
179
180 /* Like memory_error with slightly different parameters. */
181 void
182 dis_asm_memory_error (status, memaddr, info)
183 int status;
184 bfd_vma memaddr;
185 disassemble_info *info;
186 {
187 memory_error (status, memaddr);
188 }
189
190 /* Like print_address with slightly different parameters. */
191 void
192 dis_asm_print_address (addr, info)
193 bfd_vma addr;
194 struct disassemble_info *info;
195 {
196 print_address (addr, info->stream);
197 }
198
199 /* Same as target_write_memory, but report an error if can't write. */
200 void
201 write_memory (memaddr, myaddr, len)
202 CORE_ADDR memaddr;
203 char *myaddr;
204 int len;
205 {
206 int status;
207
208 status = target_write_memory (memaddr, myaddr, len);
209 if (status != 0)
210 memory_error (status, memaddr);
211 }
212
213 /* Read an integer from debugged memory, given address and number of bytes. */
214
215 LONGEST
216 read_memory_integer (memaddr, len)
217 CORE_ADDR memaddr;
218 int len;
219 {
220 char buf[sizeof (LONGEST)];
221
222 read_memory (memaddr, buf, len);
223 return extract_signed_integer (buf, len);
224 }
225
226 unsigned LONGEST
227 read_memory_unsigned_integer (memaddr, len)
228 CORE_ADDR memaddr;
229 int len;
230 {
231 char buf[sizeof (unsigned LONGEST)];
232
233 read_memory (memaddr, buf, len);
234 return extract_unsigned_integer (buf, len);
235 }
236 \f
237 /* The current default bfd target. Points to storage allocated for
238 gnutarget_string. */
239 char *gnutarget;
240
241 /* Same thing, except it is "auto" not NULL for the default case. */
242 static char *gnutarget_string;
243
244 static void set_gnutarget_command
245 PARAMS ((char *, int, struct cmd_list_element *));
246
247 static void
248 set_gnutarget_command (ignore, from_tty, c)
249 char *ignore;
250 int from_tty;
251 struct cmd_list_element *c;
252 {
253 if (STREQ (gnutarget_string, "auto"))
254 gnutarget = NULL;
255 else
256 gnutarget = gnutarget_string;
257 }
258
259 /* Set the gnutarget. */
260 void
261 set_gnutarget (newtarget)
262 char *newtarget;
263 {
264 if (gnutarget_string != NULL)
265 free (gnutarget_string);
266 gnutarget_string = savestring (newtarget, strlen (newtarget));
267 set_gnutarget_command (NULL, 0, NULL);
268 }
269
270 void
271 _initialize_core()
272 {
273 struct cmd_list_element *c;
274 c = add_cmd ("core-file", class_files, core_file_command,
275 "Use FILE as core dump for examining memory and registers.\n\
276 No arg means have no core file. This command has been superseded by the\n\
277 `target core' and `detach' commands.", &cmdlist);
278 c->completer = filename_completer;
279
280 c = add_set_cmd ("gnutarget", class_files, var_string_noescape,
281 (char *) &gnutarget_string,
282 "Set the current BFD target.\n\
283 Use `set gnutarget auto' to specify automatic detection.",
284 &setlist);
285 c->function.sfunc = set_gnutarget_command;
286 add_show_from_set (c, &showlist);
287
288 if (getenv ("GNUTARGET"))
289 set_gnutarget (getenv ("GNUTARGET"));
290 else
291 set_gnutarget ("auto");
292 }
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