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/arch/arm/lib/io-writesl.S

https://bitbucket.org/evzijst/gittest
Assembly | 66 lines | 60 code | 6 blank | 0 comment | 1 complexity | 54a75441402fc6e49467f8932889e37c MD5 | raw file
 1/*
 2 *  linux/arch/arm/lib/io-writesl.S
 3 *
 4 *  Copyright (C) 1995-2000 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
13ENTRY(__raw_writesl)
14		teq	r2, #0		@ do we have to check for the zero len?
15		moveq	pc, lr
16		ands	ip, r1, #3
17		bne	3f
18
19		subs	r2, r2, #4
20		bmi	2f
21		stmfd	sp!, {r4, lr}
221:		ldmia	r1!, {r3, r4, ip, lr}
23		subs	r2, r2, #4
24		str	r3, [r0, #0]
25		str	r4, [r0, #0]
26		str	ip, [r0, #0]
27		str	lr, [r0, #0]
28		bpl	1b
29		ldmfd	sp!, {r4, lr}
302:		movs	r2, r2, lsl #31
31		ldmcsia	r1!, {r3, ip}
32		strcs	r3, [r0, #0]
33		ldrne	r3, [r1, #0]
34		strcs	ip, [r0, #0]
35		strne	r3, [r0, #0]
36		mov	pc, lr
37
383:		bic	r1, r1, #3
39		ldr	r3, [r1], #4
40		cmp	ip, #2
41		blt	5f
42		bgt	6f
43
444:		mov	ip, r3, pull #16
45		ldr	r3, [r1], #4
46		subs	r2, r2, #1
47		orr	ip, ip, r3, push #16
48		str	ip, [r0]
49		bne	4b
50		mov	pc, lr
51
525:		mov	ip, r3, pull #8
53		ldr	r3, [r1], #4
54		subs	r2, r2, #1
55		orr	ip, ip, r3, push #24
56		str	ip, [r0]
57		bne	5b
58		mov	pc, lr
59
606:		mov	ip, r3, pull #24
61		ldr	r3, [r1], #4
62		subs	r2, r2, #1
63		orr	ip, ip, r3, push #8
64		str	ip, [r0]
65		bne	6b
66		mov	pc, lr