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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 2008 Sun Microsystems, Inc. All rights reserved.
* Use is subject to license terms.
*/
.file "atomic.s"
#define _ASM
#include <sys/asm_linkage.h>
/*
* NOTE: If atomic_dec_64 and atomic_dec_64_nv are ever
* separated, it is important to edit the libc i386 platform
* specific mapfile and remove the NODYNSORT attribute
* from atomic_dec_64_nv.
*/
ENTRY(atomic_dec_64)
ALTENTRY(atomic_dec_64_nv)
pushl %edi
pushl %ebx
movl 12(%esp), %edi // %edi = target address
movl (%edi), %eax
movl 4(%edi), %edx // %edx:%eax = old value
1:
xorl %ebx, %ebx
xorl %ecx, %ecx
not %ecx
not %ebx // %ecx:%ebx = -1
addl %eax, %ebx
adcl %edx, %ecx // add in the carry from inc
lock
cmpxchg8b (%edi) // try to stick it in
jne 1b
movl %ebx, %eax
movl %ecx, %edx // return new value
popl %ebx
popl %edi
ret
SET_SIZE(atomic_dec_64_nv)
SET_SIZE(atomic_dec_64)
/*
* NOTE: If atomic_add_64 and atomic_add_64_nv are ever
* separated, it is important to edit the libc i386 platform
* specific mapfile and remove the NODYNSORT attribute
* from atomic_add_64_nv.
*/
ENTRY(atomic_add_64)
ALTENTRY(atomic_add_64_nv)
pushl %edi
pushl %ebx
movl 12(%esp), %edi // %edi = target address
movl (%edi), %eax
movl 4(%edi), %edx // %edx:%eax = old value
1:
movl 16(%esp), %ebx
movl 20(%esp), %ecx // %ecx:%ebx = delta
addl %eax, %ebx
adcl %edx, %ecx // %ecx:%ebx = new value
lock
cmpxchg8b (%edi) // try to stick it in
jne 1b
movl %ebx, %eax
movl %ecx, %edx // return new value
popl %ebx
popl %edi
ret
SET_SIZE(atomic_add_64_nv)
SET_SIZE(atomic_add_64)
ENTRY(atomic_or_8_nv)
movl 4(%esp), %edx // %edx = target address
movb (%edx), %al // %al = old value
1:
movl 8(%esp), %ecx // %ecx = delta
orb %al, %cl // %cl = new value
lock
cmpxchgb %cl, (%edx) // try to stick it in
jne 1b
movzbl %cl, %eax // return new value
ret
SET_SIZE(atomic_or_8_nv)
ENTRY(atomic_cas_ptr)
movl 4(%esp), %edx
movl 8(%esp), %eax
movl 12(%esp), %ecx
lock
cmpxchgl %ecx, (%edx)
ret
SET_SIZE(atomic_cas_ptr)
ENTRY(atomic_cas_64)
pushl %ebx
pushl %esi
movl 12(%esp), %esi
movl 16(%esp), %eax
movl 20(%esp), %edx
movl 24(%esp), %ebx
movl 28(%esp), %ecx
lock
cmpxchg8b (%esi)
popl %esi
popl %ebx
ret
SET_SIZE(atomic_cas_64)
ENTRY(membar_producer)
lock
xorl $0, (%esp)
ret
SET_SIZE(membar_producer)
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