1b93a71755
As for RETINSTR, LOADREGS is a left-over from the 26-bit days. Remove it. Signed-off-by: Russell King <rmk+kernel@arm.linux.org.uk>
122 lines
2.4 KiB
ArmAsm
122 lines
2.4 KiB
ArmAsm
/*
|
|
* linux/arch/arm/lib/io-readsb.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>
|
|
|
|
.Linsb_align: rsb ip, ip, #4
|
|
cmp ip, r2
|
|
movgt ip, r2
|
|
cmp ip, #2
|
|
ldrb r3, [r0]
|
|
strb r3, [r1], #1
|
|
ldrgeb r3, [r0]
|
|
strgeb r3, [r1], #1
|
|
ldrgtb r3, [r0]
|
|
strgtb r3, [r1], #1
|
|
subs r2, r2, ip
|
|
bne .Linsb_aligned
|
|
|
|
ENTRY(__raw_readsb)
|
|
teq r2, #0 @ do we have to check for the zero len?
|
|
moveq pc, lr
|
|
ands ip, r1, #3
|
|
bne .Linsb_align
|
|
|
|
.Linsb_aligned: stmfd sp!, {r4 - r6, lr}
|
|
|
|
subs r2, r2, #16
|
|
bmi .Linsb_no_16
|
|
|
|
.Linsb_16_lp: ldrb r3, [r0]
|
|
ldrb r4, [r0]
|
|
ldrb r5, [r0]
|
|
mov r3, r3, put_byte_0
|
|
ldrb r6, [r0]
|
|
orr r3, r3, r4, put_byte_1
|
|
ldrb r4, [r0]
|
|
orr r3, r3, r5, put_byte_2
|
|
ldrb r5, [r0]
|
|
orr r3, r3, r6, put_byte_3
|
|
ldrb r6, [r0]
|
|
mov r4, r4, put_byte_0
|
|
ldrb ip, [r0]
|
|
orr r4, r4, r5, put_byte_1
|
|
ldrb r5, [r0]
|
|
orr r4, r4, r6, put_byte_2
|
|
ldrb r6, [r0]
|
|
orr r4, r4, ip, put_byte_3
|
|
ldrb ip, [r0]
|
|
mov r5, r5, put_byte_0
|
|
ldrb lr, [r0]
|
|
orr r5, r5, r6, put_byte_1
|
|
ldrb r6, [r0]
|
|
orr r5, r5, ip, put_byte_2
|
|
ldrb ip, [r0]
|
|
orr r5, r5, lr, put_byte_3
|
|
ldrb lr, [r0]
|
|
mov r6, r6, put_byte_0
|
|
orr r6, r6, ip, put_byte_1
|
|
ldrb ip, [r0]
|
|
orr r6, r6, lr, put_byte_2
|
|
orr r6, r6, ip, put_byte_3
|
|
stmia r1!, {r3 - r6}
|
|
|
|
subs r2, r2, #16
|
|
bpl .Linsb_16_lp
|
|
|
|
tst r2, #15
|
|
ldmeqfd sp!, {r4 - r6, pc}
|
|
|
|
.Linsb_no_16: tst r2, #8
|
|
beq .Linsb_no_8
|
|
|
|
ldrb r3, [r0]
|
|
ldrb r4, [r0]
|
|
ldrb r5, [r0]
|
|
mov r3, r3, put_byte_0
|
|
ldrb r6, [r0]
|
|
orr r3, r3, r4, put_byte_1
|
|
ldrb r4, [r0]
|
|
orr r3, r3, r5, put_byte_2
|
|
ldrb r5, [r0]
|
|
orr r3, r3, r6, put_byte_3
|
|
ldrb r6, [r0]
|
|
mov r4, r4, put_byte_0
|
|
ldrb ip, [r0]
|
|
orr r4, r4, r5, put_byte_1
|
|
orr r4, r4, r6, put_byte_2
|
|
orr r4, r4, ip, put_byte_3
|
|
stmia r1!, {r3, r4}
|
|
|
|
.Linsb_no_8: tst r2, #4
|
|
beq .Linsb_no_4
|
|
|
|
ldrb r3, [r0]
|
|
ldrb r4, [r0]
|
|
ldrb r5, [r0]
|
|
ldrb r6, [r0]
|
|
mov r3, r3, put_byte_0
|
|
orr r3, r3, r4, put_byte_1
|
|
orr r3, r3, r5, put_byte_2
|
|
orr r3, r3, r6, put_byte_3
|
|
str r3, [r1], #4
|
|
|
|
.Linsb_no_4: ands r2, r2, #3
|
|
ldmeqfd sp!, {r4 - r6, pc}
|
|
|
|
cmp r2, #2
|
|
ldrb r3, [r0]
|
|
strb r3, [r1], #1
|
|
ldrgeb r3, [r0]
|
|
strgeb r3, [r1], #1
|
|
ldrgtb r3, [r0]
|
|
strgtb r3, [r1]
|
|
|
|
ldmfd sp!, {r4 - r6, pc}
|