1*4882a593Smuzhiyun/* SPDX-License-Identifier: GPL-2.0-only */ 2*4882a593Smuzhiyun 3*4882a593Smuzhiyun#include <linux/linkage.h> 4*4882a593Smuzhiyun#include <asm/export.h> 5*4882a593Smuzhiyun 6*4882a593Smuzhiyun.text 7*4882a593Smuzhiyun 8*4882a593Smuzhiyun/* 9*4882a593Smuzhiyun * Inputs: 10*4882a593Smuzhiyun * %esi : memory location to compare 11*4882a593Smuzhiyun * %eax : low 32 bits of old value 12*4882a593Smuzhiyun * %edx : high 32 bits of old value 13*4882a593Smuzhiyun * %ebx : low 32 bits of new value 14*4882a593Smuzhiyun * %ecx : high 32 bits of new value 15*4882a593Smuzhiyun */ 16*4882a593SmuzhiyunSYM_FUNC_START(cmpxchg8b_emu) 17*4882a593Smuzhiyun 18*4882a593Smuzhiyun# 19*4882a593Smuzhiyun# Emulate 'cmpxchg8b (%esi)' on UP except we don't 20*4882a593Smuzhiyun# set the whole ZF thing (caller will just compare 21*4882a593Smuzhiyun# eax:edx with the expected value) 22*4882a593Smuzhiyun# 23*4882a593Smuzhiyun pushfl 24*4882a593Smuzhiyun cli 25*4882a593Smuzhiyun 26*4882a593Smuzhiyun cmpl (%esi), %eax 27*4882a593Smuzhiyun jne .Lnot_same 28*4882a593Smuzhiyun cmpl 4(%esi), %edx 29*4882a593Smuzhiyun jne .Lhalf_same 30*4882a593Smuzhiyun 31*4882a593Smuzhiyun movl %ebx, (%esi) 32*4882a593Smuzhiyun movl %ecx, 4(%esi) 33*4882a593Smuzhiyun 34*4882a593Smuzhiyun popfl 35*4882a593Smuzhiyun RET 36*4882a593Smuzhiyun 37*4882a593Smuzhiyun.Lnot_same: 38*4882a593Smuzhiyun movl (%esi), %eax 39*4882a593Smuzhiyun.Lhalf_same: 40*4882a593Smuzhiyun movl 4(%esi), %edx 41*4882a593Smuzhiyun 42*4882a593Smuzhiyun popfl 43*4882a593Smuzhiyun RET 44*4882a593Smuzhiyun 45*4882a593SmuzhiyunSYM_FUNC_END(cmpxchg8b_emu) 46*4882a593SmuzhiyunEXPORT_SYMBOL(cmpxchg8b_emu) 47