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/*
* 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 "_xtoll.s"
#include <SYS.h>
.set cw,0
.set cw_old,2
.set two_words,4
.set four_words,8
/ This function truncates the top of the 387 stack into a signed long.
ENTRY(__xtol) // 387-stack to signed long
subl $8,%esp
fstcw cw_old(%esp)
movw cw_old(%esp),%ax
movw %ax,%cx
andw $0x0c00,%cx // save RC
orw $0x0c00,%ax
movw %ax,cw(%esp)
fldcw cw(%esp)
fistpl two_words(%esp)
// fwait implied here
fstcw cw(%esp) // fetch CW in case masks changed value
movw cw(%esp),%ax
andw $0xf3ff,%ax
orw %cx,%ax // restore RC
movw %ax,cw(%esp)
fldcw cw(%esp)
movl two_words(%esp),%eax
addl $8,%esp
ret
SET_SIZE(__xtol)
/ This function truncates the top of the 387 stack into a signed long long.
ENTRY(__xtoll) // 387-stack to signed long long
subl $12,%esp
fstcw cw_old(%esp)
movw cw_old(%esp),%ax
movw %ax,%cx
andw $0x0c00,%cx // save RC
orw $0x0c00,%ax
movw %ax,cw(%esp)
fldcw cw(%esp)
fistpll two_words(%esp)
// fwait implied here
fstcw cw(%esp) // fetch CW in case masks changed value
movw cw(%esp),%ax
andw $0xf3ff,%ax
orw %cx,%ax // restore RC
movw %ax,cw(%esp)
fldcw cw(%esp)
movl two_words(%esp),%eax
movl four_words(%esp),%edx
addl $12,%esp
ret
SET_SIZE(__xtoll)
/ This function truncates the top of the 387 stack into a unsigned long.
.align 4
two_to_31: .long 0x4f000000
ENTRY(__xtoul) // 387-stack to unsigned long
subl $8,%esp
fstcw cw_old(%esp)
movw cw_old(%esp),%ax
movw %ax,%cx
andw $0x0c00,%cx // save RC
orw $0x0c00,%ax
movw %ax,cw(%esp)
fldcw cw(%esp)
_prologue_
fcoms _sref_(two_to_31) // compare st to 2**31
_epilogue_
fstsw %ax // store status in %ax
// use fstsw for correct trap handling
sahf // load AH into flags
jb .donotsub // jump if st < 2**31 or is NaN
_prologue_
fsubs _sref_(two_to_31) // subtract 2**31
_epilogue_
.donotsub:
fistpl two_words(%esp)
fwait // in case fistpl causes exception
movl two_words(%esp),%eax
jb .donotadd // flags did not change
add $0x80000000,%eax // add back 2**31
.donotadd:
fstcw cw(%esp) // fetch CW in case masks changed value
movw cw(%esp),%dx
andw $0xf3ff,%dx
orw %cx,%dx // restore RC
movw %dx,cw(%esp)
fldcw cw(%esp)
addl $8,%esp
ret
SET_SIZE(__xtoul)
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