mirror of https://gitee.com/openkylin/linux.git
102 lines
1.8 KiB
ArmAsm
102 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
|