sysdeps/powerpc/bits/setjmp.h

   1 /* Copyright (C) 1997,1998,2000,2003,2004,2005,2006
   2         Free Software Foundation, Inc.
   3    This file is part of the GNU C Library.
   4
   5    The GNU C Library is free software; you can redistribute it and/or
   6    modify it under the terms of the GNU Lesser General Public
   7    License as published by the Free Software Foundation; either
   8    version 2.1 of the License, or (at your option) any later version.
   9
  10    The GNU C Library 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 GNU
  13    Lesser General Public License for more details.
  14
  15    You should have received a copy of the GNU Lesser General Public
  16    License along with the GNU C Library; if not, see
  17    <http://www.gnu.org/licenses/>.  */
  18
  19 /* Define the machine-dependent type `jmp_buf'.  PowerPC version.  */
  20 #ifndef _BITS_SETJMP_H
  21 #define _BITS_SETJMP_H  1
  22
  23 #if !defined _SETJMP_H && !defined _PTHREAD_H
  24 # error "Never include <bits/setjmp.h> directly; use <setjmp.h> instead."
  25 #endif
  26
  27 /* The previous bits/setjmp.h had __jmp_buf defined as a structure.
  28    We use an array of 'long int' instead, to make writing the
  29    assembler easier. Naturally, user code should not depend on
  30    either representation. */
  31
  32 #include <bits/wordsize.h>
  33
  34 /* The current powerpc 32-bit Altivec ABI specifies for SVR4 ABI and EABI
  35    the vrsave must be at byte 248 & v20 at byte 256.  So we must pad this
  36    correctly on 32 bit.  It also insists that vecregs are only gauranteed
  37    4 byte alignment so we need to use vperm in the setjmp/longjmp routines.
  38    We have to version the code because members like  int __mask_was_saved
  39    in the jmp_buf will move as jmp_buf is now larger than 248 bytes.  We
  40    cannot keep the altivec jmp_buf backward compatible with the jmp_buf.  */
  41 #ifndef _ASM
  42 # if __WORDSIZE == 64
  43 typedef long int __jmp_buf[64] __attribute__ ((__aligned__ (16)));
  44 # else
  45 /* The alignment is not essential, i.e.the buffer can be copied to a 4 byte
  46    aligned buffer as per the ABI it is just added for performance reasons.  */
  47 typedef long int __jmp_buf[64 + (12 * 4)] __attribute__ ((__aligned__ (16)));
  48 # endif
  49 #endif
  50
  51 #endif  /* bits/setjmp.h */