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/*
* atomic64_t for 386/486
*
* Copyright © 2010 Luca Barbieri
*
* 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; either version 2 of the License, or
* (at your option) any later version.
*/
#include <linux/linkage.h>
#include <asm/alternative-asm.h>
#include <asm/dwarf2.h>
/* if you want SMP support, implement these with real spinlocks */
.macro LOCK reg
pushfl
CFI_ADJUST_CFA_OFFSET 4
cli
.endm
.macro UNLOCK reg
popfl
CFI_ADJUST_CFA_OFFSET -4
.endm
.macro BEGIN func reg
$v = \reg
ENTRY(atomic64_\func\()_386)
CFI_STARTPROC
LOCK $v
.macro RETURN
UNLOCK $v
ret
.endm
.macro END_
CFI_ENDPROC
ENDPROC(atomic64_\func\()_386)
.purgem RETURN
.purgem END_
.purgem END
.endm
.macro END
RETURN
END_
.endm
.endm
BEGIN read %ecx
movl ($v), %eax
movl 4($v), %edx
END
BEGIN set %esi
movl %ebx, ($v)
movl %ecx, 4($v)
END
BEGIN xchg %esi
movl ($v), %eax
movl 4($v), %edx
movl %ebx, ($v)
movl %ecx, 4($v)
END
BEGIN add %ecx
addl %eax, ($v)
adcl %edx, 4($v)
END
BEGIN add_return %ecx
addl ($v), %eax
adcl 4($v), %edx
movl %eax, ($v)
movl %edx, 4($v)
END
BEGIN sub %ecx
subl %eax, ($v)
sbbl %edx, 4($v)
END
BEGIN sub_return %ecx
negl %edx
negl %eax
sbbl $0, %edx
addl ($v), %eax
adcl 4($v), %edx
movl %eax, ($v)
movl %edx, 4($v)
END
BEGIN inc %esi
addl $1, ($v)
adcl $0, 4($v)
END
BEGIN inc_return %esi
movl ($v), %eax
movl 4($v), %edx
addl $1, %eax
adcl $0, %edx
movl %eax, ($v)
movl %edx, 4($v)
END
BEGIN dec %esi
subl $1, ($v)
sbbl $0, 4($v)
END
BEGIN dec_return %esi
movl ($v), %eax
movl 4($v), %edx
subl $1, %eax
sbbl $0, %edx
movl %eax, ($v)
movl %edx, 4($v)
END
BEGIN add_unless %ecx
addl %eax, %esi
adcl %edx, %edi
addl ($v), %eax
adcl 4($v), %edx
cmpl %eax, %esi
je 3f
1:
movl %eax, ($v)
movl %edx, 4($v)
movl $1, %eax
2:
RETURN
3:
cmpl %edx, %edi
jne 1b
xorl %eax, %eax
jmp 2b
END_
BEGIN inc_not_zero %esi
movl ($v), %eax
movl 4($v), %edx
testl %eax, %eax
je 3f
1:
addl $1, %eax
adcl $0, %edx
movl %eax, ($v)
movl %edx, 4($v)
movl $1, %eax
2:
RETURN
3:
testl %edx, %edx
jne 1b
jmp 2b
END_
BEGIN dec_if_positive %esi
movl ($v), %eax
movl 4($v), %edx
subl $1, %eax
sbbl $0, %edx
js 1f
movl %eax, ($v)
movl %edx, 4($v)
1:
END
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