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 "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, 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 \f
 248 void
 249 _initialize_core()
 250 {
 251
 252   add_com ("core-file", class_files, core_file_command,
 253            "Use FILE as core dump for examining memory and registers.\n\
 254 No arg means have no core file.  This command has been superseded by the\n\
 255 `target core' and `detach' commands.");
 256
 257 }