This repository has been archived on 2023-08-20. You can view files and clone it. You cannot open issues or pull requests or push a commit.
Files
RescueBootCD/extra/linux-2.6.10/arch/arm/lib/io-readsw-armv4.S

100 lines
1.6 KiB
ArmAsm

/*
* linux/arch/arm/lib/io-readsw-armv4.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>
.macro pack, rd, hw1, hw2
#ifndef __ARMEB__
orr \rd, \hw1, \hw2, lsl #16
#else
orr \rd, \hw2, \hw1, lsl #16
#endif
.endm
.insw_bad_alignment:
adr r0, .insw_bad_align_msg
mov r2, lr
b panic
.insw_bad_align_msg:
.asciz "insw: bad buffer alignment (0x%p, lr=0x%08lX)\n"
.align
.insw_align: tst r1, #1
bne .insw_bad_alignment
ldrh r3, [r0]
strh r3, [r1], #2
subs r2, r2, #1
RETINSTR(moveq, pc, lr)
ENTRY(__raw_readsw)
teq r2, #0 @ do we have to check for the zero len?
moveq pc, lr
tst r1, #3
bne .insw_align
stmfd sp!, {r4, r5, lr}
subs r2, r2, #8
bmi .no_insw_8
.insw_8_lp: ldrh r3, [r0]
ldrh r4, [r0]
pack r3, r3, r4
ldrh r4, [r0]
ldrh r5, [r0]
pack r4, r4, r5
ldrh r5, [r0]
ldrh ip, [r0]
pack r5, r5, ip
ldrh ip, [r0]
ldrh lr, [r0]
pack ip, ip, lr
stmia r1!, {r3 - r5, ip}
subs r2, r2, #8
bpl .insw_8_lp
tst r2, #7
LOADREGS(eqfd, sp!, {r4, r5, pc})
.no_insw_8: tst r2, #4
beq .no_insw_4
ldrh r3, [r0]
ldrh r4, [r0]
pack r3, r3, r4
ldrh r4, [r0]
ldrh ip, [r0]
pack r4, r4, ip
stmia r1!, {r3, r4}
.no_insw_4: tst r2, #2
beq .no_insw_2
ldrh r3, [r0]
ldrh ip, [r0]
pack r3, r3, ip
str r3, [r1], #4
.no_insw_2: tst r2, #1
ldrneh r3, [r0]
strneh r3, [r1]
LOADREGS(fd, sp!, {r4, r5, pc})