181 lines
2.6 KiB
ArmAsm
181 lines
2.6 KiB
ArmAsm
/* SPDX-License-Identifier: GPL-2.0-or-later */
|
|
/*
|
|
* atomic64_t for 586+
|
|
*
|
|
* Copyright © 2010 Luca Barbieri
|
|
*/
|
|
|
|
#include <linux/linkage.h>
|
|
#include <asm/alternative.h>
|
|
|
|
.macro read64 reg
|
|
movl %ebx, %eax
|
|
movl %ecx, %edx
|
|
/* we need LOCK_PREFIX since otherwise cmpxchg8b always does the write */
|
|
LOCK_PREFIX
|
|
cmpxchg8b (\reg)
|
|
.endm
|
|
|
|
SYM_FUNC_START(atomic64_read_cx8)
|
|
read64 %ecx
|
|
RET
|
|
SYM_FUNC_END(atomic64_read_cx8)
|
|
|
|
SYM_FUNC_START(atomic64_set_cx8)
|
|
1:
|
|
/* we don't need LOCK_PREFIX since aligned 64-bit writes
|
|
* are atomic on 586 and newer */
|
|
cmpxchg8b (%esi)
|
|
jne 1b
|
|
|
|
RET
|
|
SYM_FUNC_END(atomic64_set_cx8)
|
|
|
|
SYM_FUNC_START(atomic64_xchg_cx8)
|
|
1:
|
|
LOCK_PREFIX
|
|
cmpxchg8b (%esi)
|
|
jne 1b
|
|
|
|
RET
|
|
SYM_FUNC_END(atomic64_xchg_cx8)
|
|
|
|
.macro addsub_return func ins insc
|
|
SYM_FUNC_START(atomic64_\func\()_return_cx8)
|
|
pushl %ebp
|
|
pushl %ebx
|
|
pushl %esi
|
|
pushl %edi
|
|
|
|
movl %eax, %esi
|
|
movl %edx, %edi
|
|
movl %ecx, %ebp
|
|
|
|
read64 %ecx
|
|
1:
|
|
movl %eax, %ebx
|
|
movl %edx, %ecx
|
|
\ins\()l %esi, %ebx
|
|
\insc\()l %edi, %ecx
|
|
LOCK_PREFIX
|
|
cmpxchg8b (%ebp)
|
|
jne 1b
|
|
|
|
10:
|
|
movl %ebx, %eax
|
|
movl %ecx, %edx
|
|
popl %edi
|
|
popl %esi
|
|
popl %ebx
|
|
popl %ebp
|
|
RET
|
|
SYM_FUNC_END(atomic64_\func\()_return_cx8)
|
|
.endm
|
|
|
|
addsub_return add add adc
|
|
addsub_return sub sub sbb
|
|
|
|
.macro incdec_return func ins insc
|
|
SYM_FUNC_START(atomic64_\func\()_return_cx8)
|
|
pushl %ebx
|
|
|
|
read64 %esi
|
|
1:
|
|
movl %eax, %ebx
|
|
movl %edx, %ecx
|
|
\ins\()l $1, %ebx
|
|
\insc\()l $0, %ecx
|
|
LOCK_PREFIX
|
|
cmpxchg8b (%esi)
|
|
jne 1b
|
|
|
|
10:
|
|
movl %ebx, %eax
|
|
movl %ecx, %edx
|
|
popl %ebx
|
|
RET
|
|
SYM_FUNC_END(atomic64_\func\()_return_cx8)
|
|
.endm
|
|
|
|
incdec_return inc add adc
|
|
incdec_return dec sub sbb
|
|
|
|
SYM_FUNC_START(atomic64_dec_if_positive_cx8)
|
|
pushl %ebx
|
|
|
|
read64 %esi
|
|
1:
|
|
movl %eax, %ebx
|
|
movl %edx, %ecx
|
|
subl $1, %ebx
|
|
sbb $0, %ecx
|
|
js 2f
|
|
LOCK_PREFIX
|
|
cmpxchg8b (%esi)
|
|
jne 1b
|
|
|
|
2:
|
|
movl %ebx, %eax
|
|
movl %ecx, %edx
|
|
popl %ebx
|
|
RET
|
|
SYM_FUNC_END(atomic64_dec_if_positive_cx8)
|
|
|
|
SYM_FUNC_START(atomic64_add_unless_cx8)
|
|
pushl %ebp
|
|
pushl %ebx
|
|
/* these just push these two parameters on the stack */
|
|
pushl %edi
|
|
pushl %ecx
|
|
|
|
movl %eax, %ebp
|
|
movl %edx, %edi
|
|
|
|
read64 %esi
|
|
1:
|
|
cmpl %eax, 0(%esp)
|
|
je 4f
|
|
2:
|
|
movl %eax, %ebx
|
|
movl %edx, %ecx
|
|
addl %ebp, %ebx
|
|
adcl %edi, %ecx
|
|
LOCK_PREFIX
|
|
cmpxchg8b (%esi)
|
|
jne 1b
|
|
|
|
movl $1, %eax
|
|
3:
|
|
addl $8, %esp
|
|
popl %ebx
|
|
popl %ebp
|
|
RET
|
|
4:
|
|
cmpl %edx, 4(%esp)
|
|
jne 2b
|
|
xorl %eax, %eax
|
|
jmp 3b
|
|
SYM_FUNC_END(atomic64_add_unless_cx8)
|
|
|
|
SYM_FUNC_START(atomic64_inc_not_zero_cx8)
|
|
pushl %ebx
|
|
|
|
read64 %esi
|
|
1:
|
|
movl %eax, %ecx
|
|
orl %edx, %ecx
|
|
jz 3f
|
|
movl %eax, %ebx
|
|
xorl %ecx, %ecx
|
|
addl $1, %ebx
|
|
adcl %edx, %ecx
|
|
LOCK_PREFIX
|
|
cmpxchg8b (%esi)
|
|
jne 1b
|
|
|
|
movl $1, %eax
|
|
3:
|
|
popl %ebx
|
|
RET
|
|
SYM_FUNC_END(atomic64_inc_not_zero_cx8)
|