gdb/core-regset.c

   1 /* Machine independent GDB support for core files on systems using "regsets".
   2
   3    Copyright (C) 1993-2013 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 3 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, see <http://www.gnu.org/licenses/>.  */
  19
  20 /* This file is used by most systems that use ELF for their core
  21    dumps.  This includes most systems that have SVR4-ish variant of
  22    /proc.  For these systems, the registers are laid out the same way
  23    in core files as in the gregset_t and fpregset_t structures that
  24    are used in the interaction with /proc (Irix 4 is an exception and
  25    therefore doesn't use this file).  Quite a few systems without a
  26    SVR4-ish /proc define these structures too, and can make use of
  27    this code too.  */
  28
  29 #include "defs.h"
  30 #include "command.h"
  31 #include "gdbcore.h"
  32 #include "inferior.h"
  33 #include "target.h"
  34 #include "regcache.h"
  35
  36 #include <fcntl.h>
  37 #include <errno.h>
  38 #include <string.h>
  39 #include <time.h>
  40 #ifdef HAVE_SYS_PROCFS_H
  41 #include <sys/procfs.h>
  42 #endif
  43
  44 /* Prototypes for supply_gregset etc.  */
  45 #include "gregset.h"
  46
  47 /* Provide registers to GDB from a core file.
  48
  49    CORE_REG_SECT points to an array of bytes, which are the contents
  50    of a `note' from a core file which BFD thinks might contain
  51    register contents.  CORE_REG_SIZE is its size.
  52
  53    WHICH says which register set corelow suspects this is:
  54      0 --- the general-purpose register set, in gregset_t format
  55      2 --- the floating-point register set, in fpregset_t format
  56
  57    REG_ADDR is ignored.  */
  58
  59 static void
  60 fetch_core_registers (struct regcache *regcache,
  61                       char *core_reg_sect,
  62                       unsigned core_reg_size,
  63                       int which,
  64                       CORE_ADDR reg_addr)
  65 {
  66   gdb_gregset_t gregset;
  67   gdb_fpregset_t fpregset;
  68   gdb_gregset_t *gregset_p = &gregset;
  69   gdb_fpregset_t *fpregset_p = &fpregset;
  70
  71   switch (which)
  72     {
  73     case 0:
  74       if (core_reg_size != sizeof (gregset))
  75         warning (_("Wrong size gregset in core file."));
  76       else
  77         {
  78           memcpy (&gregset, core_reg_sect, sizeof (gregset));
  79           supply_gregset (regcache, (const gdb_gregset_t *) gregset_p);
  80         }
  81       break;
  82
  83     case 2:
  84       if (core_reg_size != sizeof (fpregset))
  85         warning (_("Wrong size fpregset in core file."));
  86       else
  87         {
  88           memcpy (&fpregset, core_reg_sect, sizeof (fpregset));
  89           if (gdbarch_fp0_regnum (get_regcache_arch (regcache)) >= 0)
  90             supply_fpregset (regcache,
  91                              (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 }