| 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 "bfd.h" |
| 29 | #include "target.h" |
| 30 | #include "gdbcore.h" |
| 31 | #include "dis-asm.h" |
| 32 | |
| 33 | extern char registers[]; |
| 34 | |
| 35 | /* Hook for `exec_file_command' command to call. */ |
| 36 | |
| 37 | void (*exec_file_display_hook) PARAMS ((char *)) = NULL; |
| 38 | |
| 39 | /* Binary file diddling handle for the core file. */ |
| 40 | |
| 41 | bfd *core_bfd = NULL; |
| 42 | |
| 43 | \f |
| 44 | /* Backward compatability with old way of specifying core files. */ |
| 45 | |
| 46 | void |
| 47 | core_file_command (filename, from_tty) |
| 48 | char *filename; |
| 49 | int from_tty; |
| 50 | { |
| 51 | struct target_ops *t; |
| 52 | |
| 53 | dont_repeat (); /* Either way, seems bogus. */ |
| 54 | |
| 55 | t = find_core_target (); |
| 56 | if (t != NULL) |
| 57 | if (!filename) |
| 58 | (t->to_detach) (filename, from_tty); |
| 59 | else |
| 60 | (t->to_open) (filename, from_tty); |
| 61 | else |
| 62 | error ("GDB can't read core files on this machine."); |
| 63 | } |
| 64 | |
| 65 | \f |
| 66 | /* Call this to specify the hook for exec_file_command to call back. |
| 67 | This is called from the x-window display code. */ |
| 68 | |
| 69 | void |
| 70 | specify_exec_file_hook (hook) |
| 71 | void (*hook) PARAMS ((char *)); |
| 72 | { |
| 73 | exec_file_display_hook = hook; |
| 74 | } |
| 75 | |
| 76 | /* The exec file must be closed before running an inferior. |
| 77 | If it is needed again after the inferior dies, it must |
| 78 | be reopened. */ |
| 79 | |
| 80 | void |
| 81 | close_exec_file () |
| 82 | { |
| 83 | #ifdef FIXME |
| 84 | if (exec_bfd) |
| 85 | bfd_tempclose (exec_bfd); |
| 86 | #endif |
| 87 | } |
| 88 | |
| 89 | void |
| 90 | reopen_exec_file () |
| 91 | { |
| 92 | #ifdef FIXME |
| 93 | if (exec_bfd) |
| 94 | bfd_reopen (exec_bfd); |
| 95 | #endif |
| 96 | } |
| 97 | \f |
| 98 | /* If we have both a core file and an exec file, |
| 99 | print a warning if they don't go together. */ |
| 100 | |
| 101 | void |
| 102 | validate_files () |
| 103 | { |
| 104 | if (exec_bfd && core_bfd) |
| 105 | { |
| 106 | if (!core_file_matches_executable_p (core_bfd, exec_bfd)) |
| 107 | warning ("core file may not match specified executable file."); |
| 108 | else if (bfd_get_mtime(exec_bfd) > bfd_get_mtime(core_bfd)) |
| 109 | warning ("exec file is newer than core file."); |
| 110 | } |
| 111 | } |
| 112 | |
| 113 | /* Return the name of the executable file as a string. |
| 114 | ERR nonzero means get error if there is none specified; |
| 115 | otherwise return 0 in that case. */ |
| 116 | |
| 117 | char * |
| 118 | get_exec_file (err) |
| 119 | int err; |
| 120 | { |
| 121 | if (exec_bfd) return bfd_get_filename(exec_bfd); |
| 122 | if (!err) return NULL; |
| 123 | |
| 124 | error ("No executable file specified.\n\ |
| 125 | Use the \"file\" or \"exec-file\" command."); |
| 126 | return NULL; |
| 127 | } |
| 128 | |
| 129 | \f |
| 130 | /* Report a memory error with error(). */ |
| 131 | |
| 132 | void |
| 133 | memory_error (status, memaddr) |
| 134 | int status; |
| 135 | CORE_ADDR memaddr; |
| 136 | { |
| 137 | |
| 138 | if (status == EIO) |
| 139 | { |
| 140 | /* Actually, address between memaddr and memaddr + len |
| 141 | was out of bounds. */ |
| 142 | error ("Cannot access memory at address %s.", local_hex_string(memaddr)); |
| 143 | } |
| 144 | else |
| 145 | { |
| 146 | error ("Error accessing memory address %s: %s.", |
| 147 | local_hex_string (memaddr), safe_strerror (status)); |
| 148 | } |
| 149 | } |
| 150 | |
| 151 | /* Same as target_read_memory, but report an error if can't read. */ |
| 152 | void |
| 153 | read_memory (memaddr, myaddr, len) |
| 154 | CORE_ADDR memaddr; |
| 155 | char *myaddr; |
| 156 | int len; |
| 157 | { |
| 158 | int status; |
| 159 | status = target_read_memory (memaddr, myaddr, len); |
| 160 | if (status != 0) |
| 161 | memory_error (status, memaddr); |
| 162 | } |
| 163 | |
| 164 | /* Like target_read_memory, but slightly different parameters. */ |
| 165 | |
| 166 | int |
| 167 | dis_asm_read_memory (memaddr, myaddr, len, info) |
| 168 | bfd_vma memaddr; |
| 169 | bfd_byte *myaddr; |
| 170 | int len; |
| 171 | disassemble_info *info; |
| 172 | { |
| 173 | return target_read_memory (memaddr, (char *) myaddr, len); |
| 174 | } |
| 175 | |
| 176 | /* Like memory_error with slightly different parameters. */ |
| 177 | void |
| 178 | dis_asm_memory_error (status, memaddr, info) |
| 179 | int status; |
| 180 | bfd_vma memaddr; |
| 181 | disassemble_info *info; |
| 182 | { |
| 183 | memory_error (status, memaddr); |
| 184 | } |
| 185 | |
| 186 | /* Like print_address with slightly different parameters. */ |
| 187 | void |
| 188 | dis_asm_print_address (addr, info) |
| 189 | bfd_vma addr; |
| 190 | struct disassemble_info *info; |
| 191 | { |
| 192 | print_address (addr, info->stream); |
| 193 | } |
| 194 | |
| 195 | /* Same as target_write_memory, but report an error if can't write. */ |
| 196 | void |
| 197 | write_memory (memaddr, myaddr, len) |
| 198 | CORE_ADDR memaddr; |
| 199 | char *myaddr; |
| 200 | int len; |
| 201 | { |
| 202 | int status; |
| 203 | |
| 204 | status = target_write_memory (memaddr, myaddr, len); |
| 205 | if (status != 0) |
| 206 | memory_error (status, memaddr); |
| 207 | } |
| 208 | |
| 209 | /* Read an integer from debugged memory, given address and number of bytes. */ |
| 210 | |
| 211 | long |
| 212 | read_memory_integer (memaddr, len) |
| 213 | CORE_ADDR memaddr; |
| 214 | int len; |
| 215 | { |
| 216 | char cbuf; |
| 217 | short sbuf; |
| 218 | int ibuf; |
| 219 | long lbuf; |
| 220 | |
| 221 | if (len == sizeof (char)) |
| 222 | { |
| 223 | read_memory (memaddr, &cbuf, len); |
| 224 | return cbuf; |
| 225 | } |
| 226 | if (len == sizeof (short)) |
| 227 | { |
| 228 | read_memory (memaddr, (char *)&sbuf, len); |
| 229 | SWAP_TARGET_AND_HOST (&sbuf, sizeof (short)); |
| 230 | return sbuf; |
| 231 | } |
| 232 | if (len == sizeof (int)) |
| 233 | { |
| 234 | read_memory (memaddr, (char *)&ibuf, len); |
| 235 | SWAP_TARGET_AND_HOST (&ibuf, sizeof (int)); |
| 236 | return ibuf; |
| 237 | } |
| 238 | if (len == sizeof (lbuf)) |
| 239 | { |
| 240 | read_memory (memaddr, (char *)&lbuf, len); |
| 241 | SWAP_TARGET_AND_HOST (&lbuf, sizeof (lbuf)); |
| 242 | return lbuf; |
| 243 | } |
| 244 | error ("Cannot handle integers of %d bytes.", len); |
| 245 | return -1; /* for lint */ |
| 246 | } |
| 247 | |
| 248 | |
| 249 | unsigned long |
| 250 | read_memory_unsigned_integer (memaddr, len) |
| 251 | CORE_ADDR memaddr; |
| 252 | int len; |
| 253 | { |
| 254 | unsigned char cbuf; |
| 255 | unsigned short sbuf; |
| 256 | unsigned int ibuf; |
| 257 | unsigned long lbuf; |
| 258 | |
| 259 | if (len == sizeof (char)) |
| 260 | { |
| 261 | read_memory (memaddr, &cbuf, len); |
| 262 | return cbuf; |
| 263 | } |
| 264 | if (len == sizeof (short)) |
| 265 | { |
| 266 | read_memory (memaddr, (char *)&sbuf, len); |
| 267 | SWAP_TARGET_AND_HOST (&sbuf, sizeof (short)); |
| 268 | return sbuf; |
| 269 | } |
| 270 | if (len == sizeof (int)) |
| 271 | { |
| 272 | read_memory (memaddr, (char *)&ibuf, len); |
| 273 | SWAP_TARGET_AND_HOST (&ibuf, sizeof (int)); |
| 274 | return ibuf; |
| 275 | } |
| 276 | if (len == sizeof (lbuf)) |
| 277 | { |
| 278 | read_memory (memaddr, (char *)&lbuf, len); |
| 279 | SWAP_TARGET_AND_HOST (&lbuf, sizeof (lbuf)); |
| 280 | return lbuf; |
| 281 | } |
| 282 | error ("Cannot handle unsigned integers of %d bytes.", len); |
| 283 | return -1; /* for lint */ |
| 284 | } |
| 285 | \f |
| 286 | void |
| 287 | _initialize_core() |
| 288 | { |
| 289 | |
| 290 | add_com ("core-file", class_files, core_file_command, |
| 291 | "Use FILE as core dump for examining memory and registers.\n\ |
| 292 | No arg means have no core file. This command has been superseded by the\n\ |
| 293 | `target core' and `detach' commands."); |
| 294 | |
| 295 | } |