gdb/core-regset.c

   1 /* Machine independent GDB support for core files on systems using "regsets".
   2
   3    Copyright (C) 1993-2014 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 <time.h>
  39 #ifdef HAVE_SYS_PROCFS_H
  40 #include <sys/procfs.h>
  41 #endif
  42
  43 /* Prototypes for supply_gregset etc.  */
  44 #include "gregset.h"
  45
  46 /* Provide registers to GDB from a core file.
  47
  48    CORE_REG_SECT points to an array of bytes, which are the contents
  49    of a `note' from a core file which BFD thinks might contain
  50    register contents.  CORE_REG_SIZE is its size.
  51
  52    WHICH says which register set corelow suspects this is:
  53      0 --- the general-purpose register set, in gregset_t format
  54      2 --- the floating-point register set, in fpregset_t format
  55
  56    REG_ADDR is ignored.  */
  57
  58 static void
  59 fetch_core_registers (struct regcache *regcache,
  60                       char *core_reg_sect,
  61                       unsigned core_reg_size,
  62                       int which,
  63                       CORE_ADDR reg_addr)
  64 {
  65   gdb_gregset_t gregset;
  66   gdb_fpregset_t fpregset;
  67   gdb_gregset_t *gregset_p = &gregset;
  68   gdb_fpregset_t *fpregset_p = &fpregset;
  69
  70   switch (which)
  71     {
  72     case 0:
  73       if (core_reg_size != sizeof (gregset))
  74         warning (_("Wrong size gregset in core file."));
  75       else
  76         {
  77           memcpy (&gregset, core_reg_sect, sizeof (gregset));
  78           supply_gregset (regcache, (const gdb_gregset_t *) gregset_p);
  79         }
  80       break;
  81
  82     case 2:
  83       if (core_reg_size != sizeof (fpregset))
  84         warning (_("Wrong size fpregset in core file."));
  85       else
  86         {
  87           memcpy (&fpregset, core_reg_sect, sizeof (fpregset));
  88           if (gdbarch_fp0_regnum (get_regcache_arch (regcache)) >= 0)
  89             supply_fpregset (regcache,
  90                              (const gdb_fpregset_t *) fpregset_p);
  91         }
  92       break;
  93
  94     default:
  95       /* We've covered all the kinds of registers we know about here,
  96          so this must be something we wouldn't know what to do with
  97          anyway.  Just ignore it.  */
  98       break;
  99     }
 100 }
 101 \f
 102
 103 /* Register that we are able to handle ELF core file formats using
 104    standard procfs "regset" structures.  */
 105
 106 static struct core_fns regset_core_fns =
 107 {
 108   bfd_target_elf_flavour,               /* core_flavour */
 109   default_check_format,                 /* check_format */
 110   default_core_sniffer,                 /* core_sniffer */
 111   fetch_core_registers,                 /* core_read_registers */
 112   NULL                                  /* next */
 113 };
 114
 115 /* Provide a prototype to silence -Wmissing-prototypes.  */
 116 extern void _initialize_core_regset (void);
 117
 118 void
 119 _initialize_core_regset (void)
 120 {
 121   deprecated_add_core_fns (&regset_core_fns);
 122 }