setjmp.s revision 9a70fc3be3b1e966bf78825cdb8d509963a6f0a1
/*
* CDDL HEADER START
*
* The contents of this file are subject to the terms of the
* Common Development and Distribution License (the "License").
* You may not use this file except in compliance with the License.
*
* You can obtain a copy of the license at usr/src/OPENSOLARIS.LICENSE
* or http://www.opensolaris.org/os/licensing.
* See the License for the specific language governing permissions
* and limitations under the License.
*
* When distributing Covered Code, include this CDDL HEADER in each
* file and include the License file at usr/src/OPENSOLARIS.LICENSE.
* If applicable, add the following below this CDDL HEADER, with the
* fields enclosed by brackets "[]" replaced with your own identifying
* information: Portions Copyright [yyyy] [name of copyright owner]
*
* CDDL HEADER END
*/
/*
* Copyright 2004 Sun Microsystems, Inc. All rights reserved.
* Use is subject to license terms.
*/
.file "setjmp.s"
/ longjmp(env, val)
/ will generate a "return(val)" from
/ the last call to
/ setjmp(env)
/ by restoring registers ip, sp, bp, bx, si, and di from 'env'
/ and doing a return.
/ entry reg offset from (%si)
/ env[0] = %ebx 0 / register variables
/ env[1] = %esi 4
/ env[2] = %edi 8
/ env[3] = %ebp 12 / stack frame
/ env[4] = %esp 16
/ env[5] = %eip 20
#include <sys/asm_linkage.h>
ANSI_PRAGMA_WEAK(setjmp,function)
ANSI_PRAGMA_WEAK(longjmp,function)
#include "SYS.h"
ENTRY(setjmp)
movl 4(%esp),%eax / jmpbuf address
movl %ebx,0(%eax) / save ebx
movl %esi,4(%eax) / save esi
movl %edi,8(%eax) / save edi
movl %ebp,12(%eax) / save caller's ebp
popl %edx / return address
movl %esp,16(%eax) / save caller's esp
movl %edx,20(%eax)
subl %eax,%eax / return 0
pushl %edx
ret
SET_SIZE(setjmp)
ENTRY(longjmp)
movl 4(%esp),%edx / first parameter after return addr
movl 8(%esp),%eax / second parameter
movl 0(%edx),%ebx / restore ebx
movl 4(%edx),%esi / restore esi
movl 8(%edx),%edi / restore edi
movl 12(%edx),%ebp / restore caller's ebp
movl 16(%edx),%esp / restore caller's esp
test %eax,%eax / if val != 0
jnz .ret / return val
incl %eax / else return 1
.ret:
jmp *20(%edx) / return to caller
SET_SIZE(longjmp)