gdb/core-regset.c

   1 /* Machine independent GDB support for core files on systems using "regsets".
   2    Copyright 1993, 1994, 1995, 1996, 1998, 1999, 2000
   3    Free Software Foundation, Inc.
   4
   5    This file is part of GDB.
   6
   7    This program is free software; you can redistribute it and/or modify
   8    it under the terms of the GNU General Public License as published by
   9    the Free Software Foundation; either version 2 of the License, or
  10    (at your option) any later version.
  11
  12    This program is distributed in the hope that it will be useful,
  13    but WITHOUT ANY WARRANTY; without even the implied warranty of
  14    MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  15    GNU General Public License for more details.
  16
  17    You should have received a copy of the GNU General Public License
  18    along with this program; if not, write to the Free Software
  19    Foundation, Inc., 59 Temple Place - Suite 330,
  20    Boston, MA 02111-1307, USA.  */
  21
  22
  23 /*                      N  O  T  E  S
  24
  25    This file is used by most systems that implement /proc.  For these systems,
  26    the general registers are laid out the same way in both the core file and
  27    the gregset_p structure.  The current exception to this is Irix-4.*, where
  28    the gregset_p structure is split up into two pieces in the core file.
  29
  30    The general register and floating point register sets are manipulated by
  31    separate ioctl's.  This file makes the assumption that if FP0_REGNUM is
  32    defined, then support for the floating point register set is desired,
  33    regardless of whether or not the actual target has floating point hardware.
  34
  35  */
  36
  37 #include "defs.h"
  38
  39 #include <time.h>
  40 #ifdef HAVE_SYS_PROCFS_H
  41 #include <sys/procfs.h>
  42 #endif
  43 #include <fcntl.h>
  44 #include <errno.h>
  45 #include "gdb_string.h"
  46
  47 #include "inferior.h"
  48 #include "target.h"
  49 #include "command.h"
  50 #include "gdbcore.h"
  51
  52 /* Prototypes for supply_gregset etc. */
  53 #include "gregset.h"
  54
  55 static void fetch_core_registers (char *, unsigned, int, CORE_ADDR);
  56
  57 void _initialize_core_regset (void);
  58
  59 /*
  60
  61    GLOBAL FUNCTION
  62
  63    fetch_core_registers -- fetch current registers from core file
  64
  65    SYNOPSIS
  66
  67    void fetch_core_registers (char *core_reg_sect,
  68    unsigned core_reg_size,
  69    int which, CORE_ADDR reg_addr)
  70
  71    DESCRIPTION
  72
  73    Read the values of either the general register set (WHICH equals 0)
  74    or the floating point register set (WHICH equals 2) from the core
  75    file data (pointed to by CORE_REG_SECT), and update gdb's idea of
  76    their current values.  The CORE_REG_SIZE parameter is compared to
  77    the size of the gregset or fpgregset structures (as appropriate) to
  78    validate the size of the structure from the core file.  The
  79    REG_ADDR parameter is ignored.
  80
  81  */
  82
  83 static void
  84 fetch_core_registers (char *core_reg_sect, unsigned core_reg_size, int which,
  85                       CORE_ADDR reg_addr)
  86 {
  87   gdb_gregset_t gregset;
  88   gdb_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 }
 116 \f
 117
 118 /* Register that we are able to handle ELF file formats using standard
 119    procfs "regset" structures.  */
 120
 121 static struct core_fns regset_core_fns =
 122 {
 123   bfd_target_elf_flavour,               /* core_flavour */
 124   default_check_format,                 /* check_format */
 125   default_core_sniffer,                 /* core_sniffer */
 126   fetch_core_registers,                 /* core_read_registers */
 127   NULL                                  /* next */
 128 };
 129
 130 void
 131 _initialize_core_regset (void)
 132 {
 133   add_core_fns (&regset_core_fns);
 134 }