gdb/core-regset.c - gdb

Global variables defined

Functions defined

Source code

  1. /* Machine independent GDB support for core files on systems using "regsets".

  3.    Copyright (C) 1993-2015 Free Software Foundation, Inc.

  5.    This file is part of GDB.

  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.

  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.

  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/>.  */

  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.  */

  29. #include "defs.h"
  30. #include "command.h"
  31. #include "gdbcore.h"
  32. #include "inferior.h"
  33. #include "target.h"
  34. #include "regcache.h"

  36. #include <fcntl.h>
  37. #include <time.h>
  38. #ifdef HAVE_SYS_PROCFS_H
  39. #include <sys/procfs.h>
  40. #endif

  42. /* Prototypes for supply_gregset etc.  */
  43. #include "gregset.h"

  45. /* Provide registers to GDB from a core file.

  47.    CORE_REG_SECT points to an array of bytes, which are the contents
  48.    of a `note' from a core file which BFD thinks might contain
  49.    register contents.  CORE_REG_SIZE is its size.

  51.    WHICH says which register set corelow suspects this is:
  52.      0 --- the general-purpose register set, in gregset_t format
  53.      2 --- the floating-point register set, in fpregset_t format

  55.    REG_ADDR is ignored.  */

  57. static void
  58. ‌fetch_core_registers (struct regcache *regcache,
  59.                       char *core_reg_sect,
  60.                       unsigned core_reg_size,
  61.                       int which,
  62.                       CORE_ADDR reg_addr)
  63. {
  64.   gdb_gregset_t gregset;
  65.   gdb_fpregset_t fpregset;
  66.   gdb_gregset_t *gregset_p = &gregset;
  67.   gdb_fpregset_t *fpregset_p = &fpregset;

  69.   switch (which)
  70.     {
  71.     case 0:
  72.       if (core_reg_size != sizeof (gregset))
  73.         warning (_("Wrong size gregset in core file."));
  74.       else
  75.         {
  76.           memcpy (&gregset, core_reg_sect, sizeof (gregset));
  77.           supply_gregset (regcache, (const gdb_gregset_t *) gregset_p);
  78.         }
  79.       break;

  81.     case 2:
  82.       if (core_reg_size != sizeof (fpregset))
  83.         warning (_("Wrong size fpregset in core file."));
  84.       else
  85.         {
  86.           memcpy (&fpregset, core_reg_sect, sizeof (fpregset));
  87.           if (gdbarch_fp0_regnum (get_regcache_arch (regcache)) >= 0)
  88.             supply_fpregset (regcache,
  89.                              (const gdb_fpregset_t *) fpregset_p);
  90.         }
  91.       break;

  93.     default:
  94.       /* We've covered all the kinds of registers we know about here,
  95.          so this must be something we wouldn't know what to do with
  96.          anyway.  Just ignore it.  */
  97.       break;
  98.     }
  99. }


  102. /* Register that we are able to handle ELF core file formats using
  103.    standard procfs "regset" structures.  */

  105. ‌static struct core_fns regset_core_fns =
  106. {
  107.   bfd_target_elf_flavour,                /* core_flavour */
  108.   default_check_format,                        /* check_format */
  109.   default_core_sniffer,                        /* core_sniffer */
  110.   fetch_core_registers,                        /* core_read_registers */
  111.   NULL                                        /* next */
  112. };

  114. /* Provide a prototype to silence -Wmissing-prototypes.  */
  115. extern void _initialize_core_regset (void);

  117. void
  118. ‌_initialize_core_regset (void)
  119. {
  120.   deprecated_add_core_fns (&regset_core_fns);
  121. }