gdb/altos-xdep.c

   1 /* Low level interface to ptrace, for GDB when running under m68k SVR2 Unix
   2    on Altos 3068.  Report bugs to Jyrki Kuoppala <jkp@cs.hut.fi>
   3    Copyright (C) 1989, 1991 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., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA.  */
  20
  21 #include "defs.h"
  22 #include "frame.h"
  23 #include "inferior.h"
  24
  25 #ifdef USG
  26 #include <sys/types.h>
  27 #endif
  28
  29 #include <sys/param.h>
  30 #include <sys/dir.h>
  31 #include <signal.h>
  32 #include <sys/ioctl.h>
  33 #include <fcntl.h>
  34 #ifdef USG
  35 #include <sys/page.h>
  36 #ifdef ALTOS
  37 #include <sys/net.h>
  38 #include <errno.h>
  39 #endif
  40 #endif
  41
  42 #include "gdbcore.h"
  43 #include <sys/user.h>           /* After a.out.h  */
  44 #include <sys/file.h>
  45 #include "gdb_stat.h"
  46
  47 \f
  48 /* Work with core dump and executable files, for GDB.
  49    This code would be in corefile.c if it weren't machine-dependent. */
  50
  51 void
  52 core_file_command (filename, from_tty)
  53      char *filename;
  54      int from_tty;
  55 {
  56   int val;
  57   extern char registers[];
  58
  59   /* Discard all vestiges of any previous core file
  60      and mark data and stack spaces as empty.  */
  61
  62   if (corefile)
  63     free (corefile);
  64   corefile = 0;
  65
  66   if (corechan >= 0)
  67     close (corechan);
  68   corechan = -1;
  69
  70   data_start = 0;
  71   data_end = 0;
  72   stack_start = STACK_END_ADDR;
  73   stack_end = STACK_END_ADDR;
  74
  75   /* Now, if a new core file was specified, open it and digest it.  */
  76
  77   if (filename)
  78     {
  79       filename = tilde_expand (filename);
  80       make_cleanup (free, filename);
  81
  82       if (have_inferior_p ())
  83         error ("To look at a core file, you must kill the program with \"kill\".");
  84       corechan = open (filename, O_RDONLY, 0);
  85       if (corechan < 0)
  86         perror_with_name (filename);
  87       /* 4.2-style (and perhaps also sysV-style) core dump file.  */
  88       {
  89         struct user u;
  90
  91         unsigned int reg_offset;
  92
  93         val = myread (corechan, &u, sizeof u);
  94         if (val < 0)
  95           perror_with_name ("Not a core file: reading upage");
  96         if (val != sizeof u)
  97           error ("Not a core file: could only read %d bytes", val);
  98         data_start = exec_data_start;
  99
 100 #if !defined (NBPG)
 101 #define NBPG NBPP
 102 #endif
 103 #if !defined (UPAGES)
 104 #define UPAGES USIZE
 105 #endif
 106
 107         data_end = data_start + NBPG * u.u_dsize;
 108         stack_start = stack_end - NBPG * u.u_ssize;
 109         data_offset = NBPG * UPAGES + exec_data_start % NBPG /* Not sure about this //jkp */;
 110         stack_offset = NBPG * (UPAGES + u.u_dsize);
 111
 112         /* Some machines put an absolute address in here and some put
 113            the offset in the upage of the regs.  */
 114         reg_offset = (int) u.u_state;
 115         if (reg_offset > NBPG * UPAGES)
 116           reg_offset -= KERNEL_U_ADDR;
 117
 118         memcpy (&core_aouthdr, &u.u_exdata, sizeof (AOUTHDR));
 119         printf_unfiltered ("Core file is from \"%s\".\n", u.u_comm);
 120
 121         /* I don't know where to find this info.
 122            So, for now, mark it as not available.  */
 123         N_SET_MAGIC (core_aouthdr, 0);
 124
 125         /* Read the register values out of the core file and store
 126            them where `read_register' will find them.  */
 127
 128         {
 129           register int regno;
 130
 131           for (regno = 0; regno < NUM_REGS; regno++)
 132             {
 133               char buf[MAX_REGISTER_RAW_SIZE];
 134
 135               val = lseek (corechan, register_addr (regno, reg_offset), 0);
 136               if (val < 0
 137                   || (val = myread (corechan, buf, sizeof buf)) < 0)
 138                 {
 139                   char * buffer = (char *) alloca (strlen (REGISTER_NAME (regno))
 140                                                    + 30);
 141                   strcpy (buffer, "Reading register ");
 142                   strcat (buffer, REGISTER_NAME (regno));
 143
 144                   perror_with_name (buffer);
 145                 }
 146
 147               supply_register (regno, buf);
 148             }
 149         }
 150       }
 151       if (filename[0] == '/')
 152         corefile = savestring (filename, strlen (filename));
 153       else
 154         {
 155           corefile = concat (current_directory, "/", filename, NULL);
 156         }
 157
 158       flush_cached_frames ();
 159       select_frame (get_current_frame (), 0);
 160       validate_files ();
 161     }
 162   else if (from_tty)
 163     printf_unfiltered ("No core file now.\n");
 164 }