gdb/core-regset.c

   1 /* Machine independent GDB support for core files on systems using "regsets".
   2    Copyright 1993-1998 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., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA.  */
  19
  20
  21 /*                      N  O  T  E  S
  22
  23 This file is used by most systems that implement /proc.  For these systems,
  24 the general registers are laid out the same way in both the core file and
  25 the gregset_p structure.  The current exception to this is Irix-4.*, where
  26 the gregset_p structure is split up into two pieces in the core file.
  27
  28 The general register and floating point register sets are manipulated by
  29 separate ioctl's.  This file makes the assumption that if FP0_REGNUM is
  30 defined, then support for the floating point register set is desired,
  31 regardless of whether or not the actual target has floating point hardware.
  32
  33  */
  34
  35 #include "defs.h"
  36
  37 #include <time.h>
  38 #ifdef HAVE_SYS_PROCFS_H
  39 #include <sys/procfs.h>
  40 #endif
  41 #include <fcntl.h>
  42 #include <errno.h>
  43 #include "gdb_string.h"
  44
  45 #include "inferior.h"
  46 #include "target.h"
  47 #include "command.h"
  48 #include "gdbcore.h"
  49
  50 static void fetch_core_registers PARAMS ((char *, unsigned, int, CORE_ADDR));
  51
  52 void _initialize_core_regset PARAMS ((void));
  53
  54 /*
  55
  56 GLOBAL FUNCTION
  57
  58         fetch_core_registers -- fetch current registers from core file
  59
  60 SYNOPSIS
  61
  62         void fetch_core_registers (char *core_reg_sect,
  63                                           unsigned core_reg_size,
  64                                           int which, CORE_ADDR reg_addr)
  65
  66 DESCRIPTION
  67
  68         Read the values of either the general register set (WHICH equals 0)
  69         or the floating point register set (WHICH equals 2) from the core
  70         file data (pointed to by CORE_REG_SECT), and update gdb's idea of
  71         their current values.  The CORE_REG_SIZE parameter is ignored.
  72
  73 NOTES
  74
  75         Use the indicated sizes to validate the gregset and fpregset
  76         structures.
  77 */
  78
  79 static void
  80 fetch_core_registers (core_reg_sect, core_reg_size, which, reg_addr)
  81      char *core_reg_sect;
  82      unsigned core_reg_size;
  83      int which;
  84      CORE_ADDR reg_addr;        /* Unused in this version */
  85 {
  86 #if defined (HAVE_GREGSET_T) && defined (HAVE_FPREGSET_T)
  87   gregset_t gregset;
  88   fpregset_t fpregset;
  89
  90   if (which == 0)
  91     {
  92       if (core_reg_size != sizeof (gregset))
  93         {
  94           warning ("wrong size gregset struct in core file");
  95         }
  96       else
  97         {
  98           memcpy ((char *) &gregset, core_reg_sect, sizeof (gregset));
  99           supply_gregset (&gregset);
 100         }
 101     }
 102   else if (which == 2)
 103     {
 104       if (core_reg_size != sizeof (fpregset))
 105         {
 106           warning ("wrong size fpregset struct in core file");
 107         }
 108       else
 109         {
 110           memcpy ((char *) &fpregset, core_reg_sect, sizeof (fpregset));
 111 #if defined (FP0_REGNUM)
 112           supply_fpregset (&fpregset);
 113 #endif
 114         }
 115     }
 116 #endif  /* defined(HAVE_GREGSET_T) && defined (HAVE_FPREGSET_T) */
 117 }
 118
 119 \f
 120 /* Register that we are able to handle ELF file formats using standard
 121    procfs "regset" structures.  */
 122
 123 static struct core_fns regset_core_fns =
 124 {
 125   bfd_target_elf_flavour,
 126   fetch_core_registers,
 127   NULL
 128 };
 129
 130 void
 131 _initialize_core_regset ()
 132 {
 133   add_core_fns (&regset_core_fns);
 134 }