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, 2008,
   4    2009, 2010, 2011 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 3 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, see <http://www.gnu.org/licenses/>.  */
  20
  21 /* This file is used by most systems that use ELF for their core
  22    dumps.  This includes most systems that have SVR4-ish variant of
  23    /proc.  For these systems, the registers are laid out the same way
  24    in core files as in the gregset_t and fpregset_t structures that
  25    are used in the interaction with /proc (Irix 4 is an exception and
  26    therefore doesn't use this file).  Quite a few systems without a
  27    SVR4-ish /proc define these structures too, and can make use of
  28    this code too.  */
  29
  30 #include "defs.h"
  31 #include "command.h"
  32 #include "gdbcore.h"
  33 #include "inferior.h"
  34 #include "target.h"
  35 #include "regcache.h"
  36
  37 #include <fcntl.h>
  38 #include <errno.h>
  39 #include "gdb_string.h"
  40 #include <time.h>
  41 #ifdef HAVE_SYS_PROCFS_H
  42 #include <sys/procfs.h>
  43 #endif
  44
  45 /* Prototypes for supply_gregset etc.  */
  46 #include "gregset.h"
  47
  48 /* Provide registers to GDB from a core file.
  49
  50    CORE_REG_SECT points to an array of bytes, which are the contents
  51    of a `note' from a core file which BFD thinks might contain
  52    register contents.  CORE_REG_SIZE is its size.
  53
  54    WHICH says which register set corelow suspects this is:
  55      0 --- the general-purpose register set, in gregset_t format
  56      2 --- the floating-point register set, in fpregset_t format
  57
  58    REG_ADDR is ignored.  */
  59
  60 static void
  61 fetch_core_registers (struct regcache *regcache,
  62                       char *core_reg_sect,
  63                       unsigned core_reg_size,
  64                       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 (get_regcache_arch (regcache)) >= 0)
  91             supply_fpregset (regcache,
  92                              (const gdb_fpregset_t *) fpregset_p);
  93         }
  94       break;
  95
  96     default:
  97       /* We've covered all the kinds of registers we know about here,
  98          so this must be something we wouldn't know what to do with
  99          anyway.  Just ignore it.  */
 100       break;
 101     }
 102 }
 103 \f
 104
 105 /* Register that we are able to handle ELF core file formats using
 106    standard procfs "regset" structures.  */
 107
 108 static struct core_fns regset_core_fns =
 109 {
 110   bfd_target_elf_flavour,               /* core_flavour */
 111   default_check_format,                 /* check_format */
 112   default_core_sniffer,                 /* core_sniffer */
 113   fetch_core_registers,                 /* core_read_registers */
 114   NULL                                  /* next */
 115 };
 116
 117 /* Provide a prototype to silence -Wmissing-prototypes.  */
 118 extern void _initialize_core_regset (void);
 119
 120 void
 121 _initialize_core_regset (void)
 122 {
 123   deprecated_add_core_fns (&regset_core_fns);
 124 }