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