gdb/core-svr4.c

   1 /* Machine independent support for SVR4 core files for GDB.
   2    Copyright 1993 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
  21 /*                      N  O  T  E  S
  22
  23 This version of fetch_core_registers() is used by most systems that
  24 implement /proc.  For these systems, the general registers are laid out
  25 the same way in both the core file and the gregset_p structure.  The
  26 current exception to this is Irix-4.*, where the gregset_p structure is
  27 split up into two pieces in the core file.
  28
  29 The general register and floating point register sets are manipulated by
  30 separate ioctl's.  This file makes the assumption that if FP0_REGNUM is
  31 defined, then support for the floating point register set is desired,
  32 regardless of whether or not the actual target has floating point hardware.
  33
  34  */
  35
  36 #include "defs.h"
  37
  38 #include <time.h>
  39 #include <sys/procfs.h>
  40 #include <fcntl.h>
  41 #include <errno.h>
  42 #include <string.h>
  43
  44 #include "inferior.h"
  45 #include "target.h"
  46 #include "command.h"
  47 #include "gdbcore.h"
  48
  49 /*
  50
  51 GLOBAL FUNCTION
  52
  53         fetch_core_registers -- fetch current registers from core file data
  54
  55 SYNOPSIS
  56
  57         void fetch_core_registers (char *core_reg_sect, unsigned core_reg_size,
  58                                    int which, unsigned in reg_addr)
  59
  60 DESCRIPTION
  61
  62         Read the values of either the general register set (WHICH equals 0)
  63         or the floating point register set (WHICH equals 2) from the core
  64         file data (pointed to by CORE_REG_SECT), and update gdb's idea of
  65         their current values.  The CORE_REG_SIZE parameter is ignored.
  66
  67 NOTES
  68
  69         Use the indicated sizes to validate the gregset and fpregset
  70         structures.
  71 */
  72
  73 void
  74 fetch_core_registers (core_reg_sect, core_reg_size, which, reg_addr)
  75      char *core_reg_sect;
  76      unsigned core_reg_size;
  77      int which;
  78      unsigned int reg_addr;     /* Unused in this version */
  79 {
  80   gregset_t gregset;
  81   fpregset_t fpregset;
  82
  83   if (which == 0)
  84     {
  85       if (core_reg_size != sizeof (gregset))
  86         {
  87           warning ("wrong size gregset struct in core file");
  88         }
  89       else
  90         {
  91           memcpy ((char *) &gregset, core_reg_sect, sizeof (gregset));
  92           supply_gregset (&gregset);
  93         }
  94     }
  95   else if (which == 2)
  96     {
  97       if (core_reg_size != sizeof (fpregset))
  98         {
  99           warning ("wrong size fpregset struct in core file");
 100         }
 101       else
 102         {
 103           memcpy ((char *) &fpregset, core_reg_sect, sizeof (fpregset));
 104 #if defined (FP0_REGNUM)
 105           supply_fpregset (&fpregset);
 106 #endif
 107         }
 108     }
 109 }