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,
  19    Boston, MA 02111-1307, USA.  */
  20
  21
  22 /*                      N  O  T  E  S
  23
  24    This file is used by most systems that implement /proc.  For these systems,
  25    the general registers are laid out the same way in both the core file and
  26    the gregset_p structure.  The current exception to this is Irix-4.*, where
  27    the gregset_p structure is 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 #ifdef HAVE_SYS_PROCFS_H
  40 #include <sys/procfs.h>
  41 #endif
  42 #include <fcntl.h>
  43 #include <errno.h>
  44 #include "gdb_string.h"
  45
  46 #include "inferior.h"
  47 #include "target.h"
  48 #include "command.h"
  49 #include "gdbcore.h"
  50
  51 /* Prototypes for supply_gregset etc. */
  52 #include "gregset.h"
  53
  54 static void fetch_core_registers PARAMS ((char *, unsigned, int, CORE_ADDR));
  55
  56 void _initialize_core_regset PARAMS ((void));
  57
  58 /*
  59
  60    GLOBAL FUNCTION
  61
  62    fetch_core_registers -- fetch current registers from core file
  63
  64    SYNOPSIS
  65
  66    void fetch_core_registers (char *core_reg_sect,
  67    unsigned core_reg_size,
  68    int which, CORE_ADDR reg_addr)
  69
  70    DESCRIPTION
  71
  72    Read the values of either the general register set (WHICH equals 0)
  73    or the floating point register set (WHICH equals 2) from the core
  74    file data (pointed to by CORE_REG_SECT), and update gdb's idea of
  75    their current values.  The CORE_REG_SIZE parameter is ignored.
  76
  77    NOTES
  78
  79    Use the indicated sizes to validate the gregset and fpregset
  80    structures.
  81  */
  82
  83 static void
  84 fetch_core_registers (core_reg_sect, core_reg_size, which, reg_addr)
  85      char *core_reg_sect;
  86      unsigned core_reg_size;
  87      int which;
  88      CORE_ADDR reg_addr;        /* Unused in this version */
  89 {
  90 #if defined (HAVE_GREGSET_T) && defined (HAVE_FPREGSET_T)
  91   gregset_t gregset;
  92   fpregset_t fpregset;
  93
  94   if (which == 0)
  95     {
  96       if (core_reg_size != sizeof (gregset))
  97         {
  98           warning ("wrong size gregset struct in core file");
  99         }
 100       else
 101         {
 102           memcpy ((char *) &gregset, core_reg_sect, sizeof (gregset));
 103           supply_gregset (&gregset);
 104         }
 105     }
 106   else if (which == 2)
 107     {
 108       if (core_reg_size != sizeof (fpregset))
 109         {
 110           warning ("wrong size fpregset struct in core file");
 111         }
 112       else
 113         {
 114           memcpy ((char *) &fpregset, core_reg_sect, sizeof (fpregset));
 115           if (FP0_REGNUM >= 0)
 116             supply_fpregset (&fpregset);
 117         }
 118     }
 119 #endif /* defined(HAVE_GREGSET_T) && defined (HAVE_FPREGSET_T) */
 120 }
 121 \f
 122
 123 /* Register that we are able to handle ELF file formats using standard
 124    procfs "regset" structures.  */
 125
 126 static struct core_fns regset_core_fns =
 127 {
 128   bfd_target_elf_flavour,               /* core_flavour */
 129   default_check_format,                 /* check_format */
 130   default_core_sniffer,                 /* core_sniffer */
 131   fetch_core_registers,                 /* core_read_registers */
 132   NULL                                  /* next */
 133 };
 134
 135 void
 136 _initialize_core_regset ()
 137 {
 138   add_core_fns (&regset_core_fns);
 139 }