linux_dsm_epyc7002/arch/x86/lib/cmpxchg8b_emu.S
Jan Beulich 5f1d919a8c x86: Improve cmpxchg8b_emu.S
- don't include unneeded headers
- drop redundant entry point label
- complete unwind annotations
- use .L prefix on local labels to not clutter the symbol table

Signed-off-by: Jan Beulich <jbeulich@suse.com>
Link: http://lkml.kernel.org/r/5422917E0200007800038081@mail.emea.novell.com
Signed-off-by: Thomas Gleixner <tglx@linutronix.de>
2014-10-08 10:05:49 +02:00

56 lines
957 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/dwarf2.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)
CFI_STARTPROC
#
# 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_cfi
cli
cmpl (%esi), %eax
jne .Lnot_same
cmpl 4(%esi), %edx
jne .Lhalf_same
movl %ebx, (%esi)
movl %ecx, 4(%esi)
CFI_REMEMBER_STATE
popfl_cfi
ret
CFI_RESTORE_STATE
.Lnot_same:
movl (%esi), %eax
.Lhalf_same:
movl 4(%esi), %edx
popfl_cfi
ret
CFI_ENDPROC
ENDPROC(cmpxchg8b_emu)