2011-06-30 16:08:56 +00:00
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/*-
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* Copyright (c) 1990 The Regents of the University of California.
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* All rights reserved.
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*
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* This code is derived from software contributed to Berkeley by
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* William Jolitz.
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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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2017-02-28 23:42:47 +00:00
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* 3. Neither the name of the University nor the names of its contributors
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2011-06-30 16:08:56 +00:00
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* may be used to endorse or promote products derived from this software
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* without specific prior written permission.
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*
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* THIS SOFTWARE IS PROVIDED BY THE REGENTS 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 REGENTS 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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#if defined(LIBC_SCCS) && !defined(lint)
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.asciz "@(#)_setjmp.s 5.1 (Berkeley) 4/23/90"
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#endif /* LIBC_SCCS and not lint */
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#include <machine/asm.h>
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__FBSDID("$FreeBSD$");
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/*
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* C library -- _setjmp, _longjmp
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*
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* _longjmp(a,v)
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* will generate a "return(v)" from the last call to
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* _setjmp(a)
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* by restoring registers from the environment 'a'.
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* The previous signal state is NOT restored.
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*/
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ENTRY(_setjmp)
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movq %rdi,%rax
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movq 0(%rsp),%rdx /* retval */
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movq %rdx, 0(%rax) /* 0; retval */
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movq %rbx, 8(%rax) /* 1; rbx */
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movq %rsp,16(%rax) /* 2; rsp */
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movq %rbp,24(%rax) /* 3; rbp */
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movq %r12,32(%rax) /* 4; r12 */
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movq %r13,40(%rax) /* 5; r13 */
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movq %r14,48(%rax) /* 6; r14 */
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movq %r15,56(%rax) /* 7; r15 */
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fnstcw 64(%rax) /* 8; fpu cw */
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stmxcsr 68(%rax) /* and mxcsr */
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xorq %rax,%rax
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ret
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END(_setjmp)
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.weak CNAME(_longjmp)
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ENTRY(_longjmp)
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movq %rdi,%rdx
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/* Restore the mxcsr, but leave exception flags intact. */
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stmxcsr -4(%rsp)
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movl 68(%rdx),%eax
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andl $0xffffffc0,%eax
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movl -4(%rsp),%edi
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andl $0x3f,%edi
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xorl %eax,%edi
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movl %edi,-4(%rsp)
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ldmxcsr -4(%rsp)
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movq %rsi,%rax /* retval */
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movq 0(%rdx),%rcx
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movq 8(%rdx),%rbx
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movq 16(%rdx),%rsp
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movq 24(%rdx),%rbp
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movq 32(%rdx),%r12
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movq 40(%rdx),%r13
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movq 48(%rdx),%r14
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movq 56(%rdx),%r15
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fldcw 64(%rdx)
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testq %rax,%rax
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jnz 1f
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incq %rax
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1: movq %rcx,0(%rsp)
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ret
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END(_longjmp)
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