91569f1f38
possible future CPU extentions with larger registers. jmp_buf's size and alignment are baked into the ABI of third party libraries and thus are very hard to change later so it is best to waste a small amount of space now. Reviewed by: brooks Differential Revision: https://reviews.freebsd.org/D3956
74 lines
2.7 KiB
C
74 lines
2.7 KiB
C
/*-
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* Copyright (c) 2014 Andrew Turner
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* Copyright (c) 2014-2015 The FreeBSD Foundation
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* All rights reserved.
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*
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* This software was developed by Andrew Turner under
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* sponsorship from the FreeBSD Foundation.
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*
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* Redistribution and use in source and binary forms, with or without
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* modification, are permitted provided that the following conditions
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* are met:
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* 1. Redistributions of source code must retain the above copyright
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* notice, this list of conditions and the following disclaimer.
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* 2. Redistributions in binary form must reproduce the above copyright
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* notice, this list of conditions and the following disclaimer in the
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* documentation and/or other materials provided with the distribution.
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*
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* THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND
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* ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
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* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
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* ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
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* FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
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* DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
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* OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
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* HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
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* LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
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* OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
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* SUCH DAMAGE.
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*
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* $FreeBSD$
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*/
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#ifndef _MACHINE_SETJMP_H_
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#define _MACHINE_SETJMP_H_
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#include <sys/cdefs.h>
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/*
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* We need to store:
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* - A magic value to differentiate the buffers
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* - The stack pointer
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* - The link register
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* - 11 general purpose registers
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* - 8 floating point registers
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* - The signal mask (128 bits)
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* i.e. 24 64-bit words, round this up to 31(+1) 128-bit words to allow for
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* CPU extensions with larger registers and stronger alignment requirements.
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*
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* The registers to save are: r19 to r29, and d8 to d15.
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*/
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#define _JBLEN 31
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#define _JB_SIGMASK 21
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/* This should only be needed in libc and may change */
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#ifdef __ASSEMBLER__
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#define _JB_MAGIC__SETJMP 0xfb5d25837d7ff700
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#define _JB_MAGIC_SETJMP 0xfb5d25837d7ff701
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#endif
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#ifndef __ASSEMBLER__
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/*
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* jmp_buf and sigjmp_buf are encapsulated in different structs to force
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* compile-time diagnostics for mismatches. The structs are the same
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* internally to avoid some run-time errors for mismatches.
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*/
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#if __BSD_VISIBLE || __POSIX_VISIBLE || __XSI_VISIBLE
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typedef struct _sigjmp_buf { __int128_t _sjb[_JBLEN + 1]; } sigjmp_buf[1];
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#endif
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typedef struct _jmp_buf { __int128_t _jb[_JBLEN + 1]; } jmp_buf[1];
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#endif /* __ASSEMBLER__ */
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#endif /* !_MACHINE_SETJMP_H_ */
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