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/arch/arm/lib/testsetbit.S

https://bitbucket.org/evzijst/gittest
Assembly | 29 lines | 26 code | 3 blank | 0 comment | 0 complexity | 561931f81c69ba4fb4db4a437ed45a90 MD5 | raw file
 1/*
 2 *  linux/arch/arm/lib/testsetbit.S
 3 *
 4 *  Copyright (C) 1995-1996 Russell King
 5 *
 6 * This program is free software; you can redistribute it and/or modify
 7 * it under the terms of the GNU General Public License version 2 as
 8 * published by the Free Software Foundation.
 9 */
10#include <linux/linkage.h>
11#include <asm/assembler.h>
12                .text
13
14ENTRY(_test_and_set_bit_be)
15		eor	r0, r0, #0x18		@ big endian byte ordering
16ENTRY(_test_and_set_bit_le)
17		add	r1, r1, r0, lsr #3	@ Get byte offset
18		and	r3, r0, #7		@ Get bit offset
19		mov	r0, #1
20		save_and_disable_irqs ip, r2
21		ldrb	r2, [r1]
22		tst	r2, r0, lsl r3
23		orr	r2, r2, r0, lsl r3
24		strb	r2, [r1]
25		restore_irqs ip
26		moveq	r0, #0
27		RETINSTR(mov,pc,lr)
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