src/fault-linux-i386.h

   1 /* Fault handler information.  Linux/i386 and Linux/x86_64 version when it
   2    supports POSIX.
   3    Copyright (C) 2002, 2009  Bruno Haible <bruno@clisp.org>
   4
   5    This program is free software; you can redistribute it and/or modify
   6    it under the terms of the GNU General Public License as published by
   7    the Free Software Foundation; either version 2, or (at your option)
   8    any later version.
   9
  10    This program is distributed in the hope that it will be useful,
  11    but WITHOUT ANY WARRANTY; without even the implied warranty of
  12    MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  13    GNU General Public License for more details.
  14
  15    You should have received a copy of the GNU General Public License
  16    along with this program; if not, write to the Free Software Foundation,
  17    Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301, USA.  */
  18
  19 #include "fault-posix-ucontext.h"
  20
  21 #if defined __x86_64__
  22 /* 64 bit registers */
  23
  24 /* See glibc/sysdeps/unix/sysv/linux/x86_64/sys/ucontext.h
  25    and the definition of GET_STACK in
  26    glibc/sysdeps/unix/sysv/linux/x86_64/sigcontextinfo.h.
  27    Note that the 'mcontext_t' defined in
  28    glibc/sysdeps/unix/sysv/linux/x86_64/sys/ucontext.h
  29    and the 'struct sigcontext' defined in
  30    glibc/sysdeps/unix/sysv/linux/x86_64/bits/sigcontext.h
  31    (see also <asm/sigcontext.h>)
  32    are effectively the same.  */
  33
  34 # define SIGSEGV_FAULT_STACKPOINTER  ((ucontext_t *) ucp)->uc_mcontext.gregs[REG_RSP]
  35
  36 #else
  37 /* 32 bit registers */
  38
  39 /* See glibc/sysdeps/unix/sysv/linux/i386/sys/ucontext.h
  40    and the definition of GET_STACK in
  41    glibc/sysdeps/unix/sysv/linux/i386/sigcontextinfo.h.
  42    Note that the 'mcontext_t' defined in
  43    glibc/sysdeps/unix/sysv/linux/i386/sys/ucontext.h
  44    and the 'struct sigcontext_ia32' defined in <asm/sigcontext32.h>
  45    are effectively the same.  */
  46
  47 # define SIGSEGV_FAULT_STACKPOINTER  ((ucontext_t *) ucp)->uc_mcontext.gregs[REG_ESP]
  48                     /* same value as ((ucontext_t *) ucp)->uc_mcontext.gregs[REG_UESP] */
  49
  50 #endif