xref: /titanic_51/usr/src/cmd/mdb/intel/amd64/libstand/setjmp.s (revision 7c478bd95313f5f23a4c958a745db2134aa03244)
1*7c478bd9Sstevel@tonic-gate/*
2*7c478bd9Sstevel@tonic-gate * CDDL HEADER START
3*7c478bd9Sstevel@tonic-gate *
4*7c478bd9Sstevel@tonic-gate * The contents of this file are subject to the terms of the
5*7c478bd9Sstevel@tonic-gate * Common Development and Distribution License, Version 1.0 only
6*7c478bd9Sstevel@tonic-gate * (the "License").  You may not use this file except in compliance
7*7c478bd9Sstevel@tonic-gate * with the License.
8*7c478bd9Sstevel@tonic-gate *
9*7c478bd9Sstevel@tonic-gate * You can obtain a copy of the license at usr/src/OPENSOLARIS.LICENSE
10*7c478bd9Sstevel@tonic-gate * or http://www.opensolaris.org/os/licensing.
11*7c478bd9Sstevel@tonic-gate * See the License for the specific language governing permissions
12*7c478bd9Sstevel@tonic-gate * and limitations under the License.
13*7c478bd9Sstevel@tonic-gate *
14*7c478bd9Sstevel@tonic-gate * When distributing Covered Code, include this CDDL HEADER in each
15*7c478bd9Sstevel@tonic-gate * file and include the License file at usr/src/OPENSOLARIS.LICENSE.
16*7c478bd9Sstevel@tonic-gate * If applicable, add the following below this CDDL HEADER, with the
17*7c478bd9Sstevel@tonic-gate * fields enclosed by brackets "[]" replaced with your own identifying
18*7c478bd9Sstevel@tonic-gate * information: Portions Copyright [yyyy] [name of copyright owner]
19*7c478bd9Sstevel@tonic-gate *
20*7c478bd9Sstevel@tonic-gate * CDDL HEADER END
21*7c478bd9Sstevel@tonic-gate */
22*7c478bd9Sstevel@tonic-gate/*
23*7c478bd9Sstevel@tonic-gate * Copyright 2004 Sun Microsystems, Inc.  All rights reserved.
24*7c478bd9Sstevel@tonic-gate * Use is subject to license terms.
25*7c478bd9Sstevel@tonic-gate */
26*7c478bd9Sstevel@tonic-gate
27*7c478bd9Sstevel@tonic-gate#pragma ident	"%Z%%M%	%I%	%E% SMI"
28*7c478bd9Sstevel@tonic-gate
29*7c478bd9Sstevel@tonic-gate#if defined(__lint)
30*7c478bd9Sstevel@tonic-gate#include <setjmp.h>
31*7c478bd9Sstevel@tonic-gate#endif
32*7c478bd9Sstevel@tonic-gate
33*7c478bd9Sstevel@tonic-gate#include <sys/asm_linkage.h>
34*7c478bd9Sstevel@tonic-gate
35*7c478bd9Sstevel@tonic-gate/*
36*7c478bd9Sstevel@tonic-gate *	longjmp(env, val)
37*7c478bd9Sstevel@tonic-gate * will generate a "return(val)" from
38*7c478bd9Sstevel@tonic-gate * the last call to
39*7c478bd9Sstevel@tonic-gate *	setjmp(env)
40*7c478bd9Sstevel@tonic-gate * by restoring registers rip rsp rbp rbx r12 r13 r14 r15 from 'env'
41*7c478bd9Sstevel@tonic-gate * and doing a return.
42*7c478bd9Sstevel@tonic-gate *
43*7c478bd9Sstevel@tonic-gate * entry    reg   offset
44*7c478bd9Sstevel@tonic-gate * env[0] = %rbx  0	register variables
45*7c478bd9Sstevel@tonic-gate * env[1] = %r12  8
46*7c478bd9Sstevel@tonic-gate * env[2] = %r13  16
47*7c478bd9Sstevel@tonic-gate * env[3] = %r14  24
48*7c478bd9Sstevel@tonic-gate * env[4] = %r15  32
49*7c478bd9Sstevel@tonic-gate * env[5] = %rbp  40	stack frame
50*7c478bd9Sstevel@tonic-gate * env[6] = %rsp  48
51*7c478bd9Sstevel@tonic-gate * env[7] = %rip  56
52*7c478bd9Sstevel@tonic-gate */
53*7c478bd9Sstevel@tonic-gate
54*7c478bd9Sstevel@tonic-gate#if defined(__lint)
55*7c478bd9Sstevel@tonic-gate/*ARGSUSED*/
56*7c478bd9Sstevel@tonic-gateint
57*7c478bd9Sstevel@tonic-gatesetjmp(jmp_buf env)
58*7c478bd9Sstevel@tonic-gate{
59*7c478bd9Sstevel@tonic-gate	return (0);
60*7c478bd9Sstevel@tonic-gate}
61*7c478bd9Sstevel@tonic-gate
62*7c478bd9Sstevel@tonic-gate/*ARGSUSED*/
63*7c478bd9Sstevel@tonic-gateint
64*7c478bd9Sstevel@tonic-gatesigsetjmp(sigjmp_buf env, int savemask)
65*7c478bd9Sstevel@tonic-gate{
66*7c478bd9Sstevel@tonic-gate	return (0);
67*7c478bd9Sstevel@tonic-gate}
68*7c478bd9Sstevel@tonic-gate#else	/* __lint */
69*7c478bd9Sstevel@tonic-gate
70*7c478bd9Sstevel@tonic-gate	ENTRY(setjmp)
71*7c478bd9Sstevel@tonic-gate	ALTENTRY(sigsetjmp)
72*7c478bd9Sstevel@tonic-gate	movq	%rbx, 0(%rdi)
73*7c478bd9Sstevel@tonic-gate	movq	%r12, 8(%rdi)
74*7c478bd9Sstevel@tonic-gate	movq	%r13, 16(%rdi)
75*7c478bd9Sstevel@tonic-gate	movq	%r14, 24(%rdi)
76*7c478bd9Sstevel@tonic-gate	movq	%r15, 32(%rdi)
77*7c478bd9Sstevel@tonic-gate	movq	%rbp, 40(%rdi)
78*7c478bd9Sstevel@tonic-gate	popq	%rdx		/* return address */
79*7c478bd9Sstevel@tonic-gate	movq	%rsp, 48(%rdi)
80*7c478bd9Sstevel@tonic-gate	movq	%rdx, 56(%rdi)
81*7c478bd9Sstevel@tonic-gate	xorl	%eax, %eax	/* return 0 */
82*7c478bd9Sstevel@tonic-gate	jmp	*%rdx
83*7c478bd9Sstevel@tonic-gate	SET_SIZE(sigsetjmp)
84*7c478bd9Sstevel@tonic-gate	SET_SIZE(setjmp)
85*7c478bd9Sstevel@tonic-gate
86*7c478bd9Sstevel@tonic-gate#endif	/* __lint */
87*7c478bd9Sstevel@tonic-gate
88*7c478bd9Sstevel@tonic-gate#if defined(__lint)
89*7c478bd9Sstevel@tonic-gate/*ARGSUSED*/
90*7c478bd9Sstevel@tonic-gatevoid
91*7c478bd9Sstevel@tonic-gatelongjmp(jmp_buf env, int val)
92*7c478bd9Sstevel@tonic-gate{
93*7c478bd9Sstevel@tonic-gate}
94*7c478bd9Sstevel@tonic-gate
95*7c478bd9Sstevel@tonic-gate/*ARGSUSED*/
96*7c478bd9Sstevel@tonic-gatevoid
97*7c478bd9Sstevel@tonic-gatesiglongjmp(sigjmp_buf env, int val)
98*7c478bd9Sstevel@tonic-gate{
99*7c478bd9Sstevel@tonic-gate}
100*7c478bd9Sstevel@tonic-gate#else	/* __lint */
101*7c478bd9Sstevel@tonic-gate
102*7c478bd9Sstevel@tonic-gate	ENTRY(longjmp)
103*7c478bd9Sstevel@tonic-gate	ALTENTRY(siglongjmp)
104*7c478bd9Sstevel@tonic-gate	movq	0(%rdi), %rbx
105*7c478bd9Sstevel@tonic-gate	movq	8(%rdi), %r12
106*7c478bd9Sstevel@tonic-gate	movq	16(%rdi), %r13
107*7c478bd9Sstevel@tonic-gate	movq	24(%rdi), %r14
108*7c478bd9Sstevel@tonic-gate	movq	32(%rdi), %r15
109*7c478bd9Sstevel@tonic-gate	movq	40(%rdi), %rbp
110*7c478bd9Sstevel@tonic-gate	movq	48(%rdi), %rsp
111*7c478bd9Sstevel@tonic-gate	movl	%esi, %eax
112*7c478bd9Sstevel@tonic-gate	test	%eax, %eax	/* if val != 0		*/
113*7c478bd9Sstevel@tonic-gate	jnz	1f		/* 	return val	*/
114*7c478bd9Sstevel@tonic-gate	incl	%eax		/* else return 1	*/
115*7c478bd9Sstevel@tonic-gate1:
116*7c478bd9Sstevel@tonic-gate	movq	56(%rdi), %rdx	/* return to caller of setjmp */
117*7c478bd9Sstevel@tonic-gate	jmp	*%rdx
118*7c478bd9Sstevel@tonic-gate	SET_SIZE(siglongjmp)
119*7c478bd9Sstevel@tonic-gate	SET_SIZE(longjmp)
120*7c478bd9Sstevel@tonic-gate
121*7c478bd9Sstevel@tonic-gate#endif	/* __lint */
122