[linux-2.6-block.git] / arch / arm / lib / io-readsl.S

/*
 *  linux/arch/arm/lib/io-readsl.S
 *
 *  Copyright (C) 1995-2000 Russell King
 *
 * This program is free software; you can redistribute it and/or modify
 * it under the terms of the GNU General Public License version 2 as
 * published by the Free Software Foundation.
 */
#include <linux/linkage.h>
#include <asm/assembler.h>

ENTRY(__raw_readsl)
		teq	r2, #0		@ do we have to check for the zero len?
		reteq	lr
		ands	ip, r1, #3
		bne	3f

		subs	r2, r2, #4
		bmi	2f
		stmfd	sp!, {r4, lr}
1:		ldr	r3, [r0, #0]
		ldr	r4, [r0, #0]
		ldr	ip, [r0, #0]
		ldr	lr, [r0, #0]
		subs	r2, r2, #4
		stmia	r1!, {r3, r4, ip, lr}
		bpl	1b
		ldmfd	sp!, {r4, lr}
2:		movs	r2, r2, lsl #31
		ldrcs	r3, [r0, #0]
		ldrcs	ip, [r0, #0]
		stmiacs	r1!, {r3, ip}
		ldrne	r3, [r0, #0]
		strne	r3, [r1, #0]
		ret	lr

3:		ldr	r3, [r0]
		cmp	ip, #2
		mov	ip, r3, get_byte_0
		strb	ip, [r1], #1
		bgt	6f
		mov	ip, r3, get_byte_1
		strb	ip, [r1], #1
		beq	5f
		mov	ip, r3, get_byte_2
		strb	ip, [r1], #1

4:		subs	r2, r2, #1
		mov	ip, r3, lspull #24
		ldrne	r3, [r0]
		orrne	ip, ip, r3, lspush #8
		strne	ip, [r1], #4
		bne	4b
		b	8f

5:		subs	r2, r2, #1
		mov	ip, r3, lspull #16
		ldrne	r3, [r0]
		orrne	ip, ip, r3, lspush #16
		strne	ip, [r1], #4
		bne	5b
		b	7f

6:		subs	r2, r2, #1
		mov	ip, r3, lspull #8
		ldrne	r3, [r0]
		orrne	ip, ip, r3, lspush #24
		strne	ip, [r1], #4
		bne	6b

		mov	r3, ip, get_byte_2
		strb	r3, [r1, #2]
7:		mov	r3, ip, get_byte_1
		strb	r3, [r1, #1]
8:		mov	r3, ip, get_byte_0
		strb	r3, [r1, #0]
		ret	lr
ENDPROC(__raw_readsl)
Commit	Line	Data
1da177e4 LT	1	/*
	2	* linux/arch/arm/lib/io-readsl.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
	13	ENTRY(__raw_readsl)
	14	teq r2, #0 @ do we have to check for the zero len?
6ebbf2ce	15	reteq lr
1da177e4 LT	16	ands ip, r1, #3
	17	bne 3f
	18
	19	subs r2, r2, #4
	20	bmi 2f
	21	stmfd sp!, {r4, lr}
	22	1: ldr r3, [r0, #0]
	23	ldr r4, [r0, #0]
	24	ldr ip, [r0, #0]
	25	ldr lr, [r0, #0]
	26	subs r2, r2, #4
	27	stmia r1!, {r3, r4, ip, lr}
	28	bpl 1b
	29	ldmfd sp!, {r4, lr}
	30	2: movs r2, r2, lsl #31
	31	ldrcs r3, [r0, #0]
	32	ldrcs ip, [r0, #0]
e44fc388	33	stmiacs r1!, {r3, ip}
1da177e4 LT	34	ldrne r3, [r0, #0]
1da177e4 LT	35	strne r3, [r1, #0]
6ebbf2ce	36	ret lr
1da177e4 LT	37
	38	3: ldr r3, [r0]
	39	cmp ip, #2
	40	mov ip, r3, get_byte_0
	41	strb ip, [r1], #1
	42	bgt 6f
	43	mov ip, r3, get_byte_1
	44	strb ip, [r1], #1
	45	beq 5f
	46	mov ip, r3, get_byte_2
	47	strb ip, [r1], #1
	48
	49	4: subs r2, r2, #1
d98b90ea	50	mov ip, r3, lspull #24
1da177e4	51	ldrne r3, [r0]
d98b90ea	52	orrne ip, ip, r3, lspush #8
1da177e4 LT	53	strne ip, [r1], #4
	54	bne 4b
	55	b 8f
	56
	57	5: subs r2, r2, #1
d98b90ea	58	mov ip, r3, lspull #16
1da177e4	59	ldrne r3, [r0]
d98b90ea	60	orrne ip, ip, r3, lspush #16
1da177e4 LT	61	strne ip, [r1], #4
	62	bne 5b
	63	b 7f
	64
	65	6: subs r2, r2, #1
d98b90ea	66	mov ip, r3, lspull #8
1da177e4	67	ldrne r3, [r0]
d98b90ea	68	orrne ip, ip, r3, lspush #24
1da177e4 LT	69	strne ip, [r1], #4
	70	bne 6b
	71
	72	mov r3, ip, get_byte_2
	73	strb r3, [r1, #2]
	74	7: mov r3, ip, get_byte_1
	75	strb r3, [r1, #1]
	76	8: mov r3, ip, get_byte_0
	77	strb r3, [r1, #0]
6ebbf2ce	78	ret lr
93ed3970	79	ENDPROC(__raw_readsl)