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awilliam
GitHub Repository: awilliam/linux-vfio
 Path: blob/master/arch/x86/lib/atomic64_386_32.S
10820 views
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/*

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 * atomic64_t for 386/486

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 *

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 * Copyright © 2010  Luca Barbieri

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 *

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 * This program is free software; you can redistribute it and/or modify

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 * it under the terms of the GNU General Public License as published by

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 * the Free Software Foundation; either version 2 of the License, or

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 * (at your option) any later version.

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 */

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#include <linux/linkage.h>

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#include <asm/alternative-asm.h>

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#include <asm/dwarf2.h>

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/* if you want SMP support, implement these with real spinlocks */

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.macro LOCK reg

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	pushfl_cfi

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	cli

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.endm

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.macro UNLOCK reg

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	popfl_cfi

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.endm

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#define BEGIN(op) \

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.macro endp; \

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	CFI_ENDPROC; \

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ENDPROC(atomic64_##op##_386); \

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.purgem endp; \

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.endm; \

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ENTRY(atomic64_##op##_386); \

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	CFI_STARTPROC; \

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	LOCK v;

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#define ENDP endp

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#define RET \

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	UNLOCK v; \

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	ret

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#define RET_ENDP \

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	RET; \

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	ENDP

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#define v %ecx

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BEGIN(read)

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	movl  (v), %eax

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	movl 4(v), %edx

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RET_ENDP

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#undef v

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#define v %esi

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BEGIN(set)

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	movl %ebx,  (v)

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	movl %ecx, 4(v)

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RET_ENDP

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#undef v

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#define v  %esi

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BEGIN(xchg)

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	movl  (v), %eax

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	movl 4(v), %edx

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	movl %ebx,  (v)

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	movl %ecx, 4(v)

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RET_ENDP

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#undef v

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#define v %ecx

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BEGIN(add)

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	addl %eax,  (v)

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	adcl %edx, 4(v)

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RET_ENDP

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#undef v

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#define v %ecx

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BEGIN(add_return)

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	addl  (v), %eax

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	adcl 4(v), %edx

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	movl %eax,  (v)

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	movl %edx, 4(v)

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RET_ENDP

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#undef v

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#define v %ecx

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BEGIN(sub)

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	subl %eax,  (v)

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	sbbl %edx, 4(v)

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RET_ENDP

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#undef v

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#define v %ecx

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BEGIN(sub_return)

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	negl %edx

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	negl %eax

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	sbbl $0, %edx

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	addl  (v), %eax

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	adcl 4(v), %edx

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	movl %eax,  (v)

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	movl %edx, 4(v)

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RET_ENDP

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#undef v

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#define v %esi

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BEGIN(inc)

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	addl $1,  (v)

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	adcl $0, 4(v)

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RET_ENDP

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#undef v

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#define v %esi

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BEGIN(inc_return)

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	movl  (v), %eax

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	movl 4(v), %edx

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	addl $1, %eax

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	adcl $0, %edx

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	movl %eax,  (v)

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	movl %edx, 4(v)

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RET_ENDP

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#undef v

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#define v %esi

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BEGIN(dec)

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	subl $1,  (v)

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	sbbl $0, 4(v)

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RET_ENDP

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#undef v

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#define v %esi

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BEGIN(dec_return)

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	movl  (v), %eax

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	movl 4(v), %edx

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	subl $1, %eax

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	sbbl $0, %edx

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	movl %eax,  (v)

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	movl %edx, 4(v)

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RET_ENDP

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#undef v

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#define v %ecx

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BEGIN(add_unless)

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	addl %eax, %esi

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	adcl %edx, %edi

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	addl  (v), %eax

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	adcl 4(v), %edx

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	cmpl %eax, %esi

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	je 3f

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1:

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	movl %eax,  (v)

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	movl %edx, 4(v)

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	movl $1, %eax

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2:

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	RET

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3:

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	cmpl %edx, %edi

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	jne 1b

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	xorl %eax, %eax

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	jmp 2b

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ENDP

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#undef v

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#define v %esi

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BEGIN(inc_not_zero)

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	movl  (v), %eax

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	movl 4(v), %edx

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	testl %eax, %eax

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	je 3f

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1:

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	addl $1, %eax

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	adcl $0, %edx

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	movl %eax,  (v)

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	movl %edx, 4(v)

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	movl $1, %eax

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2:

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	RET

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3:

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	testl %edx, %edx

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	jne 1b

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	jmp 2b

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ENDP

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#undef v

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#define v %esi

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BEGIN(dec_if_positive)

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	movl  (v), %eax

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	movl 4(v), %edx

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	subl $1, %eax

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	sbbl $0, %edx

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	js 1f

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	movl %eax,  (v)

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	movl %edx, 4(v)

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1:

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RET_ENDP

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#undef v

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