forked from mirrors/linux
2874c5fd28
Based on 1 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 as published by the free software foundation either version 2 of the license or at your option any later version extracted by the scancode license scanner the SPDX license identifier GPL-2.0-or-later has been chosen to replace the boilerplate/reference in 3029 file(s). Signed-off-by: Thomas Gleixner <tglx@linutronix.de> Reviewed-by: Allison Randal <allison@lohutok.net> Cc: linux-spdx@vger.kernel.org Link: https://lkml.kernel.org/r/20190527070032.746973796@linutronix.de Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
101 lines
1.8 KiB
ArmAsm
101 lines
1.8 KiB
ArmAsm
/* SPDX-License-Identifier: GPL-2.0-or-later */
|
|
/*
|
|
* OpenRISC string.S
|
|
*
|
|
* Linux architectural port borrowing liberally from similar works of
|
|
* others. All original copyrights apply as per the original source
|
|
* declaration.
|
|
*
|
|
* Modifications for the OpenRISC architecture:
|
|
* Copyright (C) 2003 Matjaz Breskvar <phoenix@bsemi.com>
|
|
* Copyright (C) 2010-2011 Jonas Bonn <jonas@southpole.se>
|
|
*/
|
|
|
|
#include <linux/linkage.h>
|
|
#include <asm/errno.h>
|
|
|
|
/*
|
|
* this can be optimized by doing gcc inline assemlby with
|
|
* proper constraints (no need to save args registers...)
|
|
*
|
|
*/
|
|
|
|
|
|
/*
|
|
*
|
|
* int __copy_tofrom_user(void *to, const void *from, unsigned long size);
|
|
*
|
|
* NOTE: it returns number of bytes NOT copied !!!
|
|
*
|
|
*/
|
|
.global __copy_tofrom_user
|
|
__copy_tofrom_user:
|
|
l.addi r1,r1,-12
|
|
l.sw 0(r1),r6
|
|
l.sw 4(r1),r4
|
|
l.sw 8(r1),r3
|
|
|
|
l.addi r11,r5,0
|
|
2: l.sfeq r11,r0
|
|
l.bf 1f
|
|
l.addi r11,r11,-1
|
|
8: l.lbz r6,0(r4)
|
|
9: l.sb 0(r3),r6
|
|
l.addi r3,r3,1
|
|
l.j 2b
|
|
l.addi r4,r4,1
|
|
1:
|
|
l.addi r11,r11,1 // r11 holds the return value
|
|
|
|
l.lwz r6,0(r1)
|
|
l.lwz r4,4(r1)
|
|
l.lwz r3,8(r1)
|
|
l.jr r9
|
|
l.addi r1,r1,12
|
|
|
|
.section .fixup, "ax"
|
|
99:
|
|
l.j 1b
|
|
l.nop
|
|
.previous
|
|
|
|
.section __ex_table, "a"
|
|
.long 8b, 99b // read fault
|
|
.long 9b, 99b // write fault
|
|
.previous
|
|
|
|
/*
|
|
* unsigned long clear_user(void *addr, unsigned long size) ;
|
|
*
|
|
* NOTE: it returns number of bytes NOT cleared !!!
|
|
*/
|
|
.global __clear_user
|
|
__clear_user:
|
|
l.addi r1,r1,-8
|
|
l.sw 0(r1),r4
|
|
l.sw 4(r1),r3
|
|
|
|
2: l.sfeq r4,r0
|
|
l.bf 1f
|
|
l.addi r4,r4,-1
|
|
9: l.sb 0(r3),r0
|
|
l.j 2b
|
|
l.addi r3,r3,1
|
|
|
|
1:
|
|
l.addi r11,r4,1
|
|
|
|
l.lwz r4,0(r1)
|
|
l.lwz r3,4(r1)
|
|
l.jr r9
|
|
l.addi r1,r1,8
|
|
|
|
.section .fixup, "ax"
|
|
99:
|
|
l.j 1b
|
|
l.nop
|
|
.previous
|
|
|
|
.section __ex_table, "a"
|
|
.long 9b, 99b // write fault
|
|
.previous
|