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glibc  2.9
setjmp.h
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00001 /* Copyright (C) 1997,1998,2000,2003,2004,2005,2006
00002        Free Software Foundation, Inc.
00003    This file is part of the GNU C Library.
00004 
00005    The GNU C Library is free software; you can redistribute it and/or
00006    modify it under the terms of the GNU Lesser General Public
00007    License as published by the Free Software Foundation; either
00008    version 2.1 of the License, or (at your option) any later version.
00009 
00010    The GNU C Library is distributed in the hope that it will be useful,
00011    but WITHOUT ANY WARRANTY; without even the implied warranty of
00012    MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
00013    Lesser General Public License for more details.
00014 
00015    You should have received a copy of the GNU Lesser General Public
00016    License along with the GNU C Library; if not, write to the Free
00017    Software Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA
00018    02111-1307 USA.  */
00019 
00020 /* Define the machine-dependent type `jmp_buf'.  PowerPC version.  */
00021 #ifndef _BITS_SETJMP_H
00022 #define _BITS_SETJMP_H  1
00023 
00024 #if !defined _SETJMP_H && !defined _PTHREAD_H
00025 # error "Never include <bits/setjmp.h> directly; use <setjmp.h> instead."
00026 #endif
00027 
00028 /* The previous bits/setjmp.h had __jmp_buf defined as a structure.
00029    We use an array of 'long int' instead, to make writing the
00030    assembler easier. Naturally, user code should not depend on
00031    either representation. */
00032 
00033 #include <bits/wordsize.h>
00034 
00035 /* The current powerpc 32-bit Altivec ABI specifies for SVR4 ABI and EABI
00036    the vrsave must be at byte 248 & v20 at byte 256.  So we must pad this
00037    correctly on 32 bit.  It also insists that vecregs are only gauranteed
00038    4 byte alignment so we need to use vperm in the setjmp/longjmp routines.
00039    We have to version the code because members like  int __mask_was_saved
00040    in the jmp_buf will move as jmp_buf is now larger than 248 bytes.  We
00041    cannot keep the altivec jmp_buf backward compatible with the jmp_buf.  */
00042 #ifndef       _ASM
00043 # if __WORDSIZE == 64
00044 typedef long int __jmp_buf[64] __attribute__ ((__aligned__ (16)));
00045 # else
00046 /* The alignment is not essential, i.e.the buffer can be copied to a 4 byte
00047    aligned buffer as per the ABI it is just added for performance reasons.  */
00048 typedef long int __jmp_buf[64 + (12 * 4)] __attribute__ ((__aligned__ (16)));
00049 # endif
00050 #endif
00051 
00052 #endif  /* bits/setjmp.h */