linux/arch/arm/lib/io-readsl.S
Thomas Gleixner d2912cb15b treewide: Replace GPLv2 boilerplate/reference with SPDX - rule 500
Based on 2 normalized pattern(s):

  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

  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 #

extracted by the scancode license scanner the SPDX license identifier

  GPL-2.0-only

has been chosen to replace the boilerplate/reference in 4122 file(s).

Signed-off-by: Thomas Gleixner <tglx@linutronix.de>
Reviewed-by: Enrico Weigelt <info@metux.net>
Reviewed-by: Kate Stewart <kstewart@linuxfoundation.org>
Reviewed-by: Allison Randal <allison@lohutok.net>
Cc: linux-spdx@vger.kernel.org
Link: https://lkml.kernel.org/r/20190604081206.933168790@linutronix.de
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
2019-06-19 17:09:55 +02:00

77 lines
1.4 KiB
ArmAsm

/* SPDX-License-Identifier: GPL-2.0-only */
/*
* linux/arch/arm/lib/io-readsl.S
*
* Copyright (C) 1995-2000 Russell King
*/
#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)