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Linux kernel mirror (for testing) git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git
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123456789101112131415161718192021222324252627282930313233343536373839404142434445464748495051525354555657585960616263646566676869707172737475767778798081828384858687888990919293949596979899100101102/* 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