gdb/umax-xdep.c

   1 /* umax host stuff.
   2    Copyright (C) 1986, 1987, 1989, 1991 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 <stdio.h>
  21 #include "defs.h"
  22 #include "param.h"
  23 #include "frame.h"
  24 #include "inferior.h"
  25
  26 #include <sys/param.h>
  27 #include <sys/dir.h>
  28 #include <signal.h>
  29 #include <sys/ioctl.h>
  30 #include <fcntl.h>
  31
  32 #include "gdbcore.h"
  33 #include <sys/ptrace.h>
  34 #define PTRACE_ATTACH PT_ATTACH
  35 #define PTRACE_DETACH PT_FREEPROC
  36
  37 #include <sys/file.h>
  38 #include <sys/stat.h>
  39
  40 /* Work with core dump and executable files, for GDB.
  41    This code would be in core.c if it weren't machine-dependent. */
  42
  43 void
  44 core_file_command (filename, from_tty)
  45      char *filename;
  46      int from_tty;
  47 {
  48   int val;
  49   extern char registers[];
  50
  51   /* Discard all vestiges of any previous core file
  52      and mark data and stack spaces as empty.  */
  53
  54   if (corefile)
  55     free (corefile);
  56   corefile = 0;
  57
  58   if (corechan >= 0)
  59     close (corechan);
  60   corechan = -1;
  61
  62   data_start = 0;
  63   data_end = 0;
  64   stack_start = STACK_END_ADDR;
  65   stack_end = STACK_END_ADDR;
  66
  67   /* Now, if a new core file was specified, open it and digest it.  */
  68
  69   if (filename)
  70     {
  71       filename = tilde_expand (filename);
  72       make_cleanup (free, filename);
  73
  74       if (have_inferior_p ())
  75         error ("To look at a core file, you must kill the inferior with \"kill\".");
  76       corechan = open (filename, O_RDONLY, 0);
  77       if (corechan < 0)
  78         perror_with_name (filename);
  79       /* 4.2-style (and perhaps also sysV-style) core dump file.  */
  80       {
  81         struct ptrace_user u;
  82         int reg_offset;
  83
  84         val = myread (corechan, &u, sizeof u);
  85         if (val < 0)
  86           perror_with_name (filename);
  87         data_start = exec_data_start;
  88
  89         data_end = data_start + u.pt_dsize;
  90         stack_start = stack_end - u.pt_ssize;
  91         data_offset = sizeof u;
  92         stack_offset = data_offset + u.pt_dsize;
  93         reg_offset = 0;
  94
  95         bcopy (&u.pt_aouthdr, &core_aouthdr, sizeof (AOUTHDR));
  96         printf ("Core file is from \"%s\".\n", u.pt_comm);
  97         if (u.pt_signal > 0)
  98           printf ("Program terminated with signal %d, %s.\n",
  99                         u.pt_signal,
 100                         u.pt_signal < NSIG
 101                         ? sys_siglist[u.pt_signal]
 102                         : "(undocumented)");
 103
 104         /* Read the register values out of the core file and store
 105            them where `read_register' will find them.  */
 106
 107         {
 108           register int regno;
 109
 110           for (regno = 0; regno < NUM_REGS; regno++)
 111             {
 112               char buf[MAX_REGISTER_RAW_SIZE];
 113
 114               val = lseek (corechan, register_addr (regno, reg_offset), 0);
 115               if (val < 0)
 116                 perror_with_name (filename);
 117
 118               val = myread (corechan, buf, sizeof buf);
 119               if (val < 0)
 120                 perror_with_name (filename);
 121               supply_register (regno, buf);
 122             }
 123         }
 124       }
 125       if (filename[0] == '/')
 126         corefile = savestring (filename, strlen (filename));
 127       else
 128         {
 129           corefile = concat (current_directory, "/", filename);
 130         }
 131
 132       set_current_frame ( create_new_frame (read_register (FP_REGNUM),
 133                                             read_pc ()));
 134       select_frame (get_current_frame (), 0);
 135       validate_files ();
 136     }
 137   else if (from_tty)
 138     printf ("No core file now.\n");
 139 }