| 1 | /* Core dump and executable file functions above target vector, for GDB. |
| 2 | Copyright 1986, 1987, 1989, 1991, 1992, 1993, 1994 |
| 3 | Free Software Foundation, Inc. |
| 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" |
| 22 | #include <string.h> |
| 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 "gdbcmd.h" |
| 31 | #include "bfd.h" |
| 32 | #include "target.h" |
| 33 | #include "gdbcore.h" |
| 34 | #include "dis-asm.h" |
| 35 | #include "language.h" |
| 36 | |
| 37 | extern char registers[]; |
| 38 | |
| 39 | /* Hook for `exec_file_command' command to call. */ |
| 40 | |
| 41 | void (*exec_file_display_hook) PARAMS ((char *)) = NULL; |
| 42 | |
| 43 | /* Binary file diddling handle for the core file. */ |
| 44 | |
| 45 | bfd *core_bfd = NULL; |
| 46 | |
| 47 | \f |
| 48 | /* Backward compatability with old way of specifying core files. */ |
| 49 | |
| 50 | void |
| 51 | core_file_command (filename, from_tty) |
| 52 | char *filename; |
| 53 | int from_tty; |
| 54 | { |
| 55 | struct target_ops *t; |
| 56 | |
| 57 | dont_repeat (); /* Either way, seems bogus. */ |
| 58 | |
| 59 | t = find_core_target (); |
| 60 | if (t != NULL) |
| 61 | if (!filename) |
| 62 | (t->to_detach) (filename, from_tty); |
| 63 | else |
| 64 | (t->to_open) (filename, from_tty); |
| 65 | else |
| 66 | error ("GDB can't read core files on this machine."); |
| 67 | } |
| 68 | |
| 69 | \f |
| 70 | /* Call this to specify the hook for exec_file_command to call back. |
| 71 | This is called from the x-window display code. */ |
| 72 | |
| 73 | void |
| 74 | specify_exec_file_hook (hook) |
| 75 | void (*hook) PARAMS ((char *)); |
| 76 | { |
| 77 | exec_file_display_hook = hook; |
| 78 | } |
| 79 | |
| 80 | /* The exec file must be closed before running an inferior. |
| 81 | If it is needed again after the inferior dies, it must |
| 82 | be reopened. */ |
| 83 | |
| 84 | void |
| 85 | close_exec_file () |
| 86 | { |
| 87 | #ifdef FIXME |
| 88 | if (exec_bfd) |
| 89 | bfd_tempclose (exec_bfd); |
| 90 | #endif |
| 91 | } |
| 92 | |
| 93 | void |
| 94 | reopen_exec_file () |
| 95 | { |
| 96 | #ifdef FIXME |
| 97 | if (exec_bfd) |
| 98 | bfd_reopen (exec_bfd); |
| 99 | #endif |
| 100 | } |
| 101 | \f |
| 102 | /* If we have both a core file and an exec file, |
| 103 | print a warning if they don't go together. */ |
| 104 | |
| 105 | void |
| 106 | validate_files () |
| 107 | { |
| 108 | if (exec_bfd && core_bfd) |
| 109 | { |
| 110 | if (!core_file_matches_executable_p (core_bfd, exec_bfd)) |
| 111 | warning ("core file may not match specified executable file."); |
| 112 | else if (bfd_get_mtime(exec_bfd) > bfd_get_mtime(core_bfd)) |
| 113 | warning ("exec file is newer than core file."); |
| 114 | } |
| 115 | } |
| 116 | |
| 117 | /* Return the name of the executable file as a string. |
| 118 | ERR nonzero means get error if there is none specified; |
| 119 | otherwise return 0 in that case. */ |
| 120 | |
| 121 | char * |
| 122 | get_exec_file (err) |
| 123 | int err; |
| 124 | { |
| 125 | if (exec_bfd) return bfd_get_filename(exec_bfd); |
| 126 | if (!err) return NULL; |
| 127 | |
| 128 | error ("No executable file specified.\n\ |
| 129 | Use the \"file\" or \"exec-file\" command."); |
| 130 | return NULL; |
| 131 | } |
| 132 | |
| 133 | \f |
| 134 | /* Report a memory error with error(). */ |
| 135 | |
| 136 | void |
| 137 | memory_error (status, memaddr) |
| 138 | int status; |
| 139 | CORE_ADDR memaddr; |
| 140 | { |
| 141 | if (status == EIO) |
| 142 | { |
| 143 | /* Actually, address between memaddr and memaddr + len |
| 144 | was out of bounds. */ |
| 145 | error_begin (); |
| 146 | printf_filtered ("Cannot access memory at address "); |
| 147 | print_address_numeric (memaddr, 1, gdb_stdout); |
| 148 | printf_filtered (".\n"); |
| 149 | return_to_top_level (RETURN_ERROR); |
| 150 | } |
| 151 | else |
| 152 | { |
| 153 | error_begin (); |
| 154 | printf_filtered ("Error accessing memory address "); |
| 155 | print_address_numeric (memaddr, 1, gdb_stdout); |
| 156 | printf_filtered (": %s.\n", |
| 157 | safe_strerror (status)); |
| 158 | return_to_top_level (RETURN_ERROR); |
| 159 | } |
| 160 | } |
| 161 | |
| 162 | /* Same as target_read_memory, but report an error if can't read. */ |
| 163 | void |
| 164 | read_memory (memaddr, myaddr, len) |
| 165 | CORE_ADDR memaddr; |
| 166 | char *myaddr; |
| 167 | int len; |
| 168 | { |
| 169 | int status; |
| 170 | status = target_read_memory (memaddr, myaddr, len); |
| 171 | if (status != 0) |
| 172 | memory_error (status, memaddr); |
| 173 | } |
| 174 | |
| 175 | /* Like target_read_memory, but slightly different parameters. */ |
| 176 | |
| 177 | int |
| 178 | dis_asm_read_memory (memaddr, myaddr, len, info) |
| 179 | bfd_vma memaddr; |
| 180 | bfd_byte *myaddr; |
| 181 | int len; |
| 182 | disassemble_info *info; |
| 183 | { |
| 184 | return target_read_memory (memaddr, (char *) myaddr, len); |
| 185 | } |
| 186 | |
| 187 | /* Like memory_error with slightly different parameters. */ |
| 188 | void |
| 189 | dis_asm_memory_error (status, memaddr, info) |
| 190 | int status; |
| 191 | bfd_vma memaddr; |
| 192 | disassemble_info *info; |
| 193 | { |
| 194 | memory_error (status, memaddr); |
| 195 | } |
| 196 | |
| 197 | /* Like print_address with slightly different parameters. */ |
| 198 | void |
| 199 | dis_asm_print_address (addr, info) |
| 200 | bfd_vma addr; |
| 201 | struct disassemble_info *info; |
| 202 | { |
| 203 | print_address (addr, info->stream); |
| 204 | } |
| 205 | |
| 206 | /* Same as target_write_memory, but report an error if can't write. */ |
| 207 | void |
| 208 | write_memory (memaddr, myaddr, len) |
| 209 | CORE_ADDR memaddr; |
| 210 | char *myaddr; |
| 211 | int len; |
| 212 | { |
| 213 | int status; |
| 214 | |
| 215 | status = target_write_memory (memaddr, myaddr, len); |
| 216 | if (status != 0) |
| 217 | memory_error (status, memaddr); |
| 218 | } |
| 219 | |
| 220 | /* Read an integer from debugged memory, given address and number of bytes. */ |
| 221 | |
| 222 | LONGEST |
| 223 | read_memory_integer (memaddr, len) |
| 224 | CORE_ADDR memaddr; |
| 225 | int len; |
| 226 | { |
| 227 | char buf[sizeof (LONGEST)]; |
| 228 | |
| 229 | read_memory (memaddr, buf, len); |
| 230 | return extract_signed_integer (buf, len); |
| 231 | } |
| 232 | |
| 233 | unsigned LONGEST |
| 234 | read_memory_unsigned_integer (memaddr, len) |
| 235 | CORE_ADDR memaddr; |
| 236 | int len; |
| 237 | { |
| 238 | char buf[sizeof (unsigned LONGEST)]; |
| 239 | |
| 240 | read_memory (memaddr, buf, len); |
| 241 | return extract_unsigned_integer (buf, len); |
| 242 | } |
| 243 | \f |
| 244 | #if 0 |
| 245 | /* Enable after 4.12. It is not tested. */ |
| 246 | |
| 247 | /* Search code. Targets can just make this their search function, or |
| 248 | if the protocol has a less general search function, they can call this |
| 249 | in the cases it can't handle. */ |
| 250 | void |
| 251 | generic_search (len, data, mask, startaddr, increment, lorange, hirange |
| 252 | addr_found, data_found) |
| 253 | int len; |
| 254 | char *data; |
| 255 | char *mask; |
| 256 | CORE_ADDR startaddr; |
| 257 | int increment; |
| 258 | CORE_ADDR lorange; |
| 259 | CORE_ADDR hirange; |
| 260 | CORE_ADDR *addr_found; |
| 261 | char *data_found; |
| 262 | { |
| 263 | int i; |
| 264 | CORE_ADDR curaddr = startaddr; |
| 265 | |
| 266 | while (curaddr >= lorange && curaddr < hirange) |
| 267 | { |
| 268 | read_memory (curaddr, data_found, len); |
| 269 | for (i = 0; i < len; ++i) |
| 270 | if ((data_found[i] & mask[i]) != data[i]) |
| 271 | goto try_again; |
| 272 | /* It matches. */ |
| 273 | *addr_found = curaddr; |
| 274 | return; |
| 275 | |
| 276 | try_again: |
| 277 | curaddr += increment; |
| 278 | } |
| 279 | *addr_found = (CORE_ADDR)0; |
| 280 | return; |
| 281 | } |
| 282 | #endif /* 0 */ |
| 283 | \f |
| 284 | /* The current default bfd target. Points to storage allocated for |
| 285 | gnutarget_string. */ |
| 286 | char *gnutarget; |
| 287 | |
| 288 | /* Same thing, except it is "auto" not NULL for the default case. */ |
| 289 | static char *gnutarget_string; |
| 290 | |
| 291 | static void set_gnutarget_command |
| 292 | PARAMS ((char *, int, struct cmd_list_element *)); |
| 293 | |
| 294 | static void |
| 295 | set_gnutarget_command (ignore, from_tty, c) |
| 296 | char *ignore; |
| 297 | int from_tty; |
| 298 | struct cmd_list_element *c; |
| 299 | { |
| 300 | if (STREQ (gnutarget_string, "auto")) |
| 301 | gnutarget = NULL; |
| 302 | else |
| 303 | gnutarget = gnutarget_string; |
| 304 | } |
| 305 | |
| 306 | /* Set the gnutarget. */ |
| 307 | void |
| 308 | set_gnutarget (newtarget) |
| 309 | char *newtarget; |
| 310 | { |
| 311 | if (gnutarget_string != NULL) |
| 312 | free (gnutarget_string); |
| 313 | gnutarget_string = savestring (newtarget, strlen (newtarget)); |
| 314 | set_gnutarget_command (NULL, 0, NULL); |
| 315 | } |
| 316 | |
| 317 | void |
| 318 | _initialize_core() |
| 319 | { |
| 320 | struct cmd_list_element *c; |
| 321 | c = add_cmd ("core-file", class_files, core_file_command, |
| 322 | "Use FILE as core dump for examining memory and registers.\n\ |
| 323 | No arg means have no core file. This command has been superseded by the\n\ |
| 324 | `target core' and `detach' commands.", &cmdlist); |
| 325 | c->completer = filename_completer; |
| 326 | |
| 327 | c = add_set_cmd ("gnutarget", class_files, var_string_noescape, |
| 328 | (char *) &gnutarget_string, |
| 329 | "Set the current BFD target.\n\ |
| 330 | Use `set gnutarget auto' to specify automatic detection.", |
| 331 | &setlist); |
| 332 | c->function.sfunc = set_gnutarget_command; |
| 333 | add_show_from_set (c, &showlist); |
| 334 | |
| 335 | if (getenv ("GNUTARGET")) |
| 336 | set_gnutarget (getenv ("GNUTARGET")); |
| 337 | else |
| 338 | set_gnutarget ("auto"); |
| 339 | } |