gdb/core-regset.c

   1 /* Machine independent GDB support for core files on systems using "regsets".
   2
   3    Copyright (C) 1993, 1994, 1995, 1996, 1998, 1999, 2000, 2003, 2007
   4    Free Software Foundation, Inc.
   5
   6    This file is part of GDB.
   7
   8    This program is free software; you can redistribute it and/or modify
   9    it under the terms of the GNU General Public License as published by
  10    the Free Software Foundation; either version 2 of the License, or
  11    (at your option) any later version.
  12
  13    This program is distributed in the hope that it will be useful,
  14    but WITHOUT ANY WARRANTY; without even the implied warranty of
  15    MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  16    GNU General Public License for more details.
  17
  18    You should have received a copy of the GNU General Public License
  19    along with this program; if not, write to the Free Software
  20    Foundation, Inc., 51 Franklin Street, Fifth Floor,
  21    Boston, MA 02110-1301, USA.  */
  22
  23 /* This file is used by most systems that use ELF for their core
  24    dumps.  This includes most systems that have SVR4-ish variant of
  25    /proc.  For these systems, the registers are laid out the same way
  26    in core files as in the gregset_t and fpregset_t structures that
  27    are used in the interaction with /proc (Irix 4 is an exception and
  28    therefore doesn't use this file).  Quite a few systems without a
  29    SVR4-ish /proc define these structures too, and can make use of
  30    this code too.  */
  31
  32 #include "defs.h"
  33 #include "command.h"
  34 #include "gdbcore.h"
  35 #include "inferior.h"
  36 #include "target.h"
  37 #include "regcache.h"
  38
  39 #include <fcntl.h>
  40 #include <errno.h>
  41 #include "gdb_string.h"
  42 #include <time.h>
  43 #ifdef HAVE_SYS_PROCFS_H
  44 #include <sys/procfs.h>
  45 #endif
  46
  47 /* Prototypes for supply_gregset etc.  */
  48 #include "gregset.h"
  49
  50 /* Provide registers to GDB from a core file.
  51
  52    CORE_REG_SECT points to an array of bytes, which are the contents
  53    of a `note' from a core file which BFD thinks might contain
  54    register contents.  CORE_REG_SIZE is its size.
  55
  56    WHICH says which register set corelow suspects this is:
  57      0 --- the general-purpose register set, in gregset_t format
  58      2 --- the floating-point register set, in fpregset_t format
  59
  60    REG_ADDR is ignored.  */
  61
  62 static void
  63 fetch_core_registers (struct regcache *regcache,
  64                       char *core_reg_sect, unsigned core_reg_size, int which,
  65                       CORE_ADDR reg_addr)
  66 {
  67   gdb_gregset_t gregset;
  68   gdb_fpregset_t fpregset;
  69   gdb_gregset_t *gregset_p = &gregset;
  70   gdb_fpregset_t *fpregset_p = &fpregset;
  71
  72   switch (which)
  73     {
  74     case 0:
  75       if (core_reg_size != sizeof (gregset))
  76         warning (_("Wrong size gregset in core file."));
  77       else
  78         {
  79           memcpy (&gregset, core_reg_sect, sizeof (gregset));
  80           supply_gregset (regcache, (const gdb_gregset_t *) gregset_p);
  81         }
  82       break;
  83
  84     case 2:
  85       if (core_reg_size != sizeof (fpregset))
  86         warning (_("Wrong size fpregset in core file."));
  87       else
  88         {
  89           memcpy (&fpregset, core_reg_sect, sizeof (fpregset));
  90           if (gdbarch_fp0_regnum (current_gdbarch) >= 0)
  91             supply_fpregset (regcache, (const gdb_fpregset_t *) fpregset_p);
  92         }
  93       break;
  94
  95     default:
  96       /* We've covered all the kinds of registers we know about here,
  97          so this must be something we wouldn't know what to do with
  98          anyway.  Just ignore it.  */
  99       break;
 100     }
 101 }
 102 \f
 103
 104 /* Register that we are able to handle ELF core file formats using
 105    standard procfs "regset" structures.  */
 106
 107 static struct core_fns regset_core_fns =
 108 {
 109   bfd_target_elf_flavour,               /* core_flavour */
 110   default_check_format,                 /* check_format */
 111   default_core_sniffer,                 /* core_sniffer */
 112   fetch_core_registers,                 /* core_read_registers */
 113   NULL                                  /* next */
 114 };
 115
 116 /* Provide a prototype to silence -Wmissing-prototypes.  */
 117 extern void _initialize_core_regset (void);
 118
 119 void
 120 _initialize_core_regset (void)
 121 {
 122   deprecated_add_core_fns (&regset_core_fns);
 123 }