You can not select more than 25 topics
Topics must start with a letter or number, can include dashes ('-') and can be up to 35 characters long.
79 lines
1.5 KiB
79 lines
1.5 KiB
/*
|
|
* 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?
|
|
moveq pc, 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]
|
|
stmcsia r1!, {r3, ip}
|
|
ldrne r3, [r0, #0]
|
|
strne r3, [r1, #0]
|
|
mov pc, 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, pull #24
|
|
ldrne r3, [r0]
|
|
orrne ip, ip, r3, push #8
|
|
strne ip, [r1], #4
|
|
bne 4b
|
|
b 8f
|
|
|
|
5: subs r2, r2, #1
|
|
mov ip, r3, pull #16
|
|
ldrne r3, [r0]
|
|
orrne ip, ip, r3, push #16
|
|
strne ip, [r1], #4
|
|
bne 5b
|
|
b 7f
|
|
|
|
6: subs r2, r2, #1
|
|
mov ip, r3, pull #8
|
|
ldrne r3, [r0]
|
|
orrne ip, ip, r3, push #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]
|
|
mov pc, lr
|
|
ENDPROC(__raw_readsl)
|
|
|