53 lines
909 B
ArmAsm
53 lines
909 B
ArmAsm
/*
|
|
* This program is free software; you can redistribute it and/or
|
|
* modify it under the terms of the GNU General Public License
|
|
* as published by the Free Software Foundation; version 2
|
|
* of the License.
|
|
*
|
|
*/
|
|
|
|
#include <linux/linkage.h>
|
|
#include <asm/export.h>
|
|
|
|
.text
|
|
|
|
/*
|
|
* Inputs:
|
|
* %esi : memory location to compare
|
|
* %eax : low 32 bits of old value
|
|
* %edx : high 32 bits of old value
|
|
* %ebx : low 32 bits of new value
|
|
* %ecx : high 32 bits of new value
|
|
*/
|
|
ENTRY(cmpxchg8b_emu)
|
|
|
|
#
|
|
# Emulate 'cmpxchg8b (%esi)' on UP except we don't
|
|
# set the whole ZF thing (caller will just compare
|
|
# eax:edx with the expected value)
|
|
#
|
|
pushfl
|
|
cli
|
|
|
|
cmpl (%esi), %eax
|
|
jne .Lnot_same
|
|
cmpl 4(%esi), %edx
|
|
jne .Lhalf_same
|
|
|
|
movl %ebx, (%esi)
|
|
movl %ecx, 4(%esi)
|
|
|
|
popfl
|
|
ret
|
|
|
|
.Lnot_same:
|
|
movl (%esi), %eax
|
|
.Lhalf_same:
|
|
movl 4(%esi), %edx
|
|
|
|
popfl
|
|
ret
|
|
|
|
ENDPROC(cmpxchg8b_emu)
|
|
EXPORT_SYMBOL(cmpxchg8b_emu)
|