/* | |
* 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) |