gdb/core-regset.c

   1 /* Machine independent GDB support for core files on systems using "regsets".
   2    Copyright 1993-1996 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 /*
  51
  52 GLOBAL FUNCTION
  53
  54         fetch_core_registers -- fetch current registers from core file
  55
  56 SYNOPSIS
  57
  58         void fetch_core_registers (char *core_reg_sect,
  59                                           unsigned core_reg_size,
  60                                           int which, unsigned in reg_addr)
  61
  62 DESCRIPTION
  63
  64         Read the values of either the general register set (WHICH equals 0)
  65         or the floating point register set (WHICH equals 2) from the core
  66         file data (pointed to by CORE_REG_SECT), and update gdb's idea of
  67         their current values.  The CORE_REG_SIZE parameter is ignored.
  68
  69 NOTES
  70
  71         Use the indicated sizes to validate the gregset and fpregset
  72         structures.
  73 */
  74
  75 static void
  76 fetch_core_registers (core_reg_sect, core_reg_size, which, reg_addr)
  77      char *core_reg_sect;
  78      unsigned core_reg_size;
  79      int which;
  80      unsigned int reg_addr;     /* Unused in this version */
  81 {
  82 #if defined (HAVE_GREGSET_T) && defined (HAVE_FPREGSET_T)
  83   gregset_t gregset;
  84   fpregset_t fpregset;
  85
  86   if (which == 0)
  87     {
  88       if (core_reg_size != sizeof (gregset))
  89         {
  90           warning ("wrong size gregset struct in core file");
  91         }
  92       else
  93         {
  94           memcpy ((char *) &gregset, core_reg_sect, sizeof (gregset));
  95           supply_gregset (&gregset);
  96         }
  97     }
  98   else if (which == 2)
  99     {
 100       if (core_reg_size != sizeof (fpregset))
 101         {
 102           warning ("wrong size fpregset struct in core file");
 103         }
 104       else
 105         {
 106           memcpy ((char *) &fpregset, core_reg_sect, sizeof (fpregset));
 107 #if defined (FP0_REGNUM)
 108           supply_fpregset (&fpregset);
 109 #endif
 110         }
 111     }
 112 #endif  /* defined(HAVE_GREGSET_T) && defined (HAVE_FPREGSET_T) */
 113 }
 114
 115 \f
 116 /* Register that we are able to handle ELF file formats using standard
 117    procfs "regset" structures.  */
 118
 119 static struct core_fns regset_core_fns =
 120 {
 121   bfd_target_elf_flavour,
 122   fetch_core_registers,
 123   NULL
 124 };
 125
 126 void
 127 _initialize_core_regset ()
 128 {
 129   add_core_fns (&regset_core_fns);
 130 }