/* 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,r5,02: l.sfeq r11,r0 l.bf 1f l.addi r11,r11,-18: l.lbz r6,0(r4)9: l.sb 0(r3),r6 l.addi r3,r3,1 l.j 2b l.addi r4,r4,11: 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,-19: 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
/* 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