[dragonfly.git] / lib / libc / x86_64 / gen / setjmp.S

/*-
 * Copyright (c) 1990 The Regents of the University of California.
 * All rights reserved.
 *
 * This code is derived from software contributed to Berkeley by
 * William Jolitz.
 *
 * Redistribution and use in source and binary forms, with or without
 * modification, are permitted provided that the following conditions
 * are met:
 * 1. Redistributions of source code must retain the above copyright
 *    notice, this list of conditions and the following disclaimer.
 * 2. Redistributions in binary form must reproduce the above copyright
 *    notice, this list of conditions and the following disclaimer in the
 *    documentation and/or other materials provided with the distribution.
 * 4. Neither the name of the University nor the names of its contributors
 *    may be used to endorse or promote products derived from this software
 *    without specific prior written permission.
 *
 * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
 * ARE DISCLAIMED.  IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
 * SUCH DAMAGE.
 *
 * @(#)setjmp.s	5.1 (Berkeley) 4/23/90
 * $FreeBSD: src/lib/libc/amd64/gen/setjmp.S,v 1.29 2008/11/02 01:10:54 peter Exp $
 */

#include <machine/asm.h>

/*
 * C library -- _setjmp, _longjmp
 *
 *	longjmp(a,v)
 * will generate a "return(v)" from the last call to
 *	setjmp(a)
 * by restoring registers from the environment 'a'.
 * The previous signal state is restored.
 */

#include "SYS.h"

ENTRY(setjmp)
	pushq	%rdi
	movq	%rdi,%rcx
	movq	$1,%rdi			/* SIG_BLOCK       */
	movq	$0,%rsi			/* (sigset_t*)set  */
	leaq	72(%rcx),%rdx		/* 9,10; (sigset_t*)oset */
	call	PIC_PLT(CNAME(_sigprocmask))
	popq	%rdi
	movq	%rdi,%rcx
	movq	0(%rsp),%rdx		/* retval */
	movq	%rdx, 0(%rcx)		/* 0; retval */
	movq	%rbx, 8(%rcx)		/* 1; rbx */
	movq	%rsp,16(%rcx)		/* 2; rsp */
	movq	%rbp,24(%rcx)		/* 3; rbp */
	movq	%r12,32(%rcx)		/* 4; r12 */
	movq	%r13,40(%rcx)		/* 5; r13 */
	movq	%r14,48(%rcx)		/* 6; r14 */
	movq	%r15,56(%rcx)		/* 7; r15 */
	fnstcw	64(%rcx)		/* 8; fpu cw */
	stmxcsr	68(%rcx)		/*    and mxcsr */
	xorq	%rax,%rax
	ret
END(setjmp)

	.weak CNAME(longjmp)
	.set CNAME(longjmp),CNAME(__longjmp)
ENTRY(__longjmp)
	pushq	%rdi
	pushq	%rsi
	movq	%rdi,%rdx
	movq	$3,%rdi			/* SIG_SETMASK     */
	leaq	72(%rdx),%rsi		/* (sigset_t*)set  */
	movq	$0,%rdx			/* (sigset_t*)oset */
	call	PIC_PLT(CNAME(_sigprocmask))
	popq	%rsi
	popq	%rdi			/* jmpbuf */
	movq	%rdi,%rdx
	/* Restore the mxcsr, but leave exception flags intact. */
	stmxcsr	-4(%rsp)
	movl	68(%rdx),%eax
	andl	$0xffffffc0,%eax
	movl	-4(%rsp),%edi
	andl	$0x3f,%edi
	xorl	%eax,%edi
	movl	%edi,-4(%rsp)
	ldmxcsr -4(%rsp)
	movq	%rsi,%rax		/* retval */
	movq	0(%rdx),%rcx
	movq	8(%rdx),%rbx
	movq	16(%rdx),%rsp
	movq	24(%rdx),%rbp
	movq	32(%rdx),%r12
	movq	40(%rdx),%r13
	movq	48(%rdx),%r14
	movq	56(%rdx),%r15
	fldcw	64(%rdx)
	testq	%rax,%rax
	jnz	1f
	incq	%rax
1:	movq	%rcx,0(%rsp)
	ret
END(__longjmp)
Commit	Line	Data
17030342 MD	1	/*-
	2	* Copyright (c) 1990 The Regents of the University of California.
	3	* All rights reserved.
	4	*
	5	* This code is derived from software contributed to Berkeley by
	6	* William Jolitz.
	7	*
	8	* Redistribution and use in source and binary forms, with or without
	9	* modification, are permitted provided that the following conditions
	10	* are met:
	11	* 1. Redistributions of source code must retain the above copyright
	12	* notice, this list of conditions and the following disclaimer.
	13	* 2. Redistributions in binary form must reproduce the above copyright
	14	* notice, this list of conditions and the following disclaimer in the
	15	* documentation and/or other materials provided with the distribution.
17030342 MD	16	* 4. Neither the name of the University nor the names of its contributors
	17	* may be used to endorse or promote products derived from this software
	18	* without specific prior written permission.
	19	*
	20	* THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
	21	* ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
	22	* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
	23	* ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
	24	* FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
	25	* DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
	26	* OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
	27	* HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
	28	* LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
	29	* OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
	30	* SUCH DAMAGE.
	31	*
	32	* @(#)setjmp.s 5.1 (Berkeley) 4/23/90
eb9f4715	33	* $FreeBSD: src/lib/libc/amd64/gen/setjmp.S,v 1.29 2008/11/02 01:10:54 peter Exp $
17030342 MD	34	*/
	35
	36	#include <machine/asm.h>
	37
	38	/*
	39	* C library -- _setjmp, _longjmp
	40	*
	41	* longjmp(a,v)
	42	* will generate a "return(v)" from the last call to
	43	* setjmp(a)
	44	* by restoring registers from the environment 'a'.
	45	* The previous signal state is restored.
	46	*/
	47
	48	#include "SYS.h"
	49
	50	ENTRY(setjmp)
	51	pushq %rdi
	52	movq %rdi,%rcx
	53	movq $1,%rdi /* SIG_BLOCK */
	54	movq $0,%rsi /* (sigset_t)set /
	55	leaq 72(%rcx),%rdx /* 9,10; (sigset_t)oset /
	56	call PIC_PLT(CNAME(_sigprocmask))
	57	popq %rdi
	58	movq %rdi,%rcx
	59	movq 0(%rsp),%rdx /* retval */
	60	movq %rdx, 0(%rcx) /* 0; retval */
	61	movq %rbx, 8(%rcx) /* 1; rbx */
	62	movq %rsp,16(%rcx) /* 2; rsp */
	63	movq %rbp,24(%rcx) /* 3; rbp */
	64	movq %r12,32(%rcx) /* 4; r12 */
	65	movq %r13,40(%rcx) /* 5; r13 */
	66	movq %r14,48(%rcx) /* 6; r14 */
	67	movq %r15,56(%rcx) /* 7; r15 */
	68	fnstcw 64(%rcx) /* 8; fpu cw */
eb9f4715	69	stmxcsr 68(%rcx) /* and mxcsr */
17030342 MD	70	xorq %rax,%rax
17030342 MD	71	ret
eb9f4715	72	END(setjmp)
17030342 MD	73
	74	.weak CNAME(longjmp)
	75	.set CNAME(longjmp),CNAME(__longjmp)
	76	ENTRY(__longjmp)
	77	pushq %rdi
	78	pushq %rsi
	79	movq %rdi,%rdx
	80	movq $3,%rdi /* SIG_SETMASK */
	81	leaq 72(%rdx),%rsi /* (sigset_t)set /
	82	movq $0,%rdx /* (sigset_t)oset /
	83	call PIC_PLT(CNAME(_sigprocmask))
	84	popq %rsi
	85	popq %rdi /* jmpbuf */
	86	movq %rdi,%rdx
eb9f4715 PA	87	/* Restore the mxcsr, but leave exception flags intact. */
	88	stmxcsr -4(%rsp)
	89	movl 68(%rdx),%eax
	90	andl $0xffffffc0,%eax
	91	movl -4(%rsp),%edi
	92	andl $0x3f,%edi
	93	xorl %eax,%edi
	94	movl %edi,-4(%rsp)
	95	ldmxcsr -4(%rsp)
17030342 MD	96	movq %rsi,%rax /* retval */
	97	movq 0(%rdx),%rcx
	98	movq 8(%rdx),%rbx
	99	movq 16(%rdx),%rsp
	100	movq 24(%rdx),%rbp
	101	movq 32(%rdx),%r12
	102	movq 40(%rdx),%r13
	103	movq 48(%rdx),%r14
	104	movq 56(%rdx),%r15
17030342 MD	105	fldcw 64(%rdx)
	106	testq %rax,%rax
	107	jnz 1f
	108	incq %rax
	109	1: movq %rcx,0(%rsp)
	110	ret
eb9f4715	111	END(__longjmp)