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81 lines
3.5 KiB
C
81 lines
3.5 KiB
C
/* Copyright (C) 1997, 1998, 2000, 2003, 2004 Free Software Foundation, Inc.
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This file is part of the GNU C Library.
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The GNU C Library is free software; you can redistribute it and/or
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modify it under the terms of the GNU Lesser General Public
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License as published by the Free Software Foundation; either
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version 2.1 of the License, or (at your option) any later version.
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The GNU C Library is distributed in the hope that it will be useful,
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but WITHOUT ANY WARRANTY; without even the implied warranty of
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MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
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Lesser General Public License for more details.
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You should have received a copy of the GNU Lesser General Public
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License along with the GNU C Library; if not, write to the Free
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Software Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA
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02111-1307 USA. */
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/* Define the machine-dependent type `jmp_buf'. PowerPC version. */
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#ifndef _BITS_SETJMP_H
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#define _BITS_SETJMP_H 1
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#if !defined _SETJMP_H && !defined _PTHREAD_H
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# error "Never include <bits/setjmp.h> directly; use <setjmp.h> instead."
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#endif
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/* The previous bits/setjmp.h had __jmp_buf defined as a structure.
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We use an array of 'long int' instead, to make writing the
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assembler easier. Naturally, user code should not depend on
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either representation. */
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#include <bits/wordsize.h>
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#if defined __USE_MISC || defined _ASM
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# define JB_GPR1 0 /* Also known as the stack pointer */
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# define JB_GPR2 1
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# define JB_LR 2 /* The address we will return to */
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# if __WORDSIZE == 64
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# define JB_GPRS 3 /* GPRs 14 through 31 are saved, 18*2 words total. */
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# define JB_CR 21 /* Condition code registers with the VRSAVE at */
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/* offset 172 (low half of the double word. */
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# define JB_FPRS 22 /* FPRs 14 through 31 are saved, 18*2 words total. */
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# define JB_SIZE (64 * 8) /* As per PPC64-VMX ABI. */
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# define JB_VRSAVE 21 /* VRSAVE shares a double word with the CR at offset */
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/* 168 (high half of the double word). */
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# define JB_VRS 40 /* VRs 20 through 31 are saved, 12*4 words total. */
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# else
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# define JB_GPRS 3 /* GPRs 14 through 31 are saved, 18 in total. */
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# define JB_CR 21 /* Condition code registers. */
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# define JB_FPRS 22 /* FPRs 14 through 31 are saved, 18*2 words total. */
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# define JB_SIZE ((64 + (12 * 4)) * 4)
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# define JB_VRSAVE 62
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# define JB_VRS 64
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# endif
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#endif
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/* The current powerpc 32-bit Altivec ABI specifies for SVR4 ABI and EABI
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the vrsave must be at byte 248 & v20 at byte 256. So we must pad this
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correctly on 32 bit. It also insists that vecregs are only gauranteed
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4 byte alignment so we need to use vperm in the setjmp/longjmp routines.
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We have to version the code because members like int __mask_was_saved
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in the jmp_buf will move as jmp_buf is now larger than 248 bytes. We
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cannot keep the altivec jmp_buf backward compatible with the jmp_buf. */
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#ifndef _ASM
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# if __WORDSIZE == 64
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typedef long int __jmp_buf[64] __attribute__ ((__aligned__ (16)));
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# else
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/* The alignment is not essential, i.e.the buffer can be copied to a 4 byte
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aligned buffer as per the ABI it is just added for performance reasons. */
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typedef long int __jmp_buf[64 + (12 * 4)] __attribute__ ((__aligned__ (16)));
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# endif
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#endif
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/* Test if longjmp to JMPBUF would unwind the frame
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containing a local variable at ADDRESS. */
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#define _JMPBUF_UNWINDS(jmpbuf, address) \
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((void *) (address) < (void *) (jmpbuf)[JB_GPR1])
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#endif /* bits/setjmp.h */
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