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 (char *, unsigned, int, CORE_ADDR);
  55
  56 void _initialize_core_regset (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 compared to
  76    the size of the gregset or fpgregset structures (as appropriate) to
  77    validate the size of the structure from the core file.  The
  78    REG_ADDR parameter is ignored.
  79
  80  */
  81
  82 static void
  83 fetch_core_registers (char *core_reg_sect, unsigned core_reg_size, int which,
  84                       CORE_ADDR reg_addr)
  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 (FP0_REGNUM >= 0)
 112             supply_fpregset (&fpregset);
 113         }
 114     }
 115 #endif /* defined(HAVE_GREGSET_T) && defined (HAVE_FPREGSET_T) */
 116 }
 117 \f
 118
 119 /* Register that we are able to handle ELF file formats using standard
 120    procfs "regset" structures.  */
 121
 122 static struct core_fns regset_core_fns =
 123 {
 124   bfd_target_elf_flavour,               /* core_flavour */
 125   default_check_format,                 /* check_format */
 126   default_core_sniffer,                 /* core_sniffer */
 127   fetch_core_registers,                 /* core_read_registers */
 128   NULL                                  /* next */
 129 };
 130
 131 void
 132 _initialize_core_regset (void)
 133 {
 134   add_core_fns (&regset_core_fns);
 135 }