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 /* The current powerpc 32-bit Altivec ABI specifies for SVR4 ABI and EABI 33 the vrsave must be at byte 248 & v20 at byte 256. So we must pad this 34 correctly on 32 bit. It also insists that vecregs are only gauranteed 35 4 byte alignment so we need to use vperm in the setjmp/longjmp routines. 36 We have to version the code because members like int __mask_was_saved 37 in the jmp_buf will move as jmp_buf is now larger than 248 bytes. We 38 cannot keep the altivec jmp_buf backward compatible with the jmp_buf. */ 39 40 /* The alignment is not essential, i.e.the buffer can be copied to a 4 byte 41 aligned buffer as per the ABI it is just added for performance reasons. */ 42 typedef long int __jmp_buf[64 + (12 * 4)] __attribute__ ((__aligned__ (16))); 43 44 #endif /* bits/setjmp.h */ 45