1*4882a593Smuzhiyun/* SPDX-License-Identifier: GPL-2.0-or-later */ 2*4882a593Smuzhiyun/* 3*4882a593Smuzhiyun * OpenRISC string.S 4*4882a593Smuzhiyun * 5*4882a593Smuzhiyun * Linux architectural port borrowing liberally from similar works of 6*4882a593Smuzhiyun * others. All original copyrights apply as per the original source 7*4882a593Smuzhiyun * declaration. 8*4882a593Smuzhiyun * 9*4882a593Smuzhiyun * Modifications for the OpenRISC architecture: 10*4882a593Smuzhiyun * Copyright (C) 2003 Matjaz Breskvar <phoenix@bsemi.com> 11*4882a593Smuzhiyun * Copyright (C) 2010-2011 Jonas Bonn <jonas@southpole.se> 12*4882a593Smuzhiyun */ 13*4882a593Smuzhiyun 14*4882a593Smuzhiyun#include <linux/linkage.h> 15*4882a593Smuzhiyun#include <asm/errno.h> 16*4882a593Smuzhiyun 17*4882a593Smuzhiyun /* 18*4882a593Smuzhiyun * this can be optimized by doing gcc inline assemlby with 19*4882a593Smuzhiyun * proper constraints (no need to save args registers...) 20*4882a593Smuzhiyun * 21*4882a593Smuzhiyun */ 22*4882a593Smuzhiyun 23*4882a593Smuzhiyun 24*4882a593Smuzhiyun/* 25*4882a593Smuzhiyun * 26*4882a593Smuzhiyun * int __copy_tofrom_user(void *to, const void *from, unsigned long size); 27*4882a593Smuzhiyun * 28*4882a593Smuzhiyun * NOTE: it returns number of bytes NOT copied !!! 29*4882a593Smuzhiyun * 30*4882a593Smuzhiyun */ 31*4882a593Smuzhiyun .global __copy_tofrom_user 32*4882a593Smuzhiyun__copy_tofrom_user: 33*4882a593Smuzhiyun l.addi r1,r1,-12 34*4882a593Smuzhiyun l.sw 0(r1),r6 35*4882a593Smuzhiyun l.sw 4(r1),r4 36*4882a593Smuzhiyun l.sw 8(r1),r3 37*4882a593Smuzhiyun 38*4882a593Smuzhiyun l.addi r11,r5,0 39*4882a593Smuzhiyun2: l.sfeq r11,r0 40*4882a593Smuzhiyun l.bf 1f 41*4882a593Smuzhiyun l.addi r11,r11,-1 42*4882a593Smuzhiyun8: l.lbz r6,0(r4) 43*4882a593Smuzhiyun9: l.sb 0(r3),r6 44*4882a593Smuzhiyun l.addi r3,r3,1 45*4882a593Smuzhiyun l.j 2b 46*4882a593Smuzhiyun l.addi r4,r4,1 47*4882a593Smuzhiyun1: 48*4882a593Smuzhiyun l.addi r11,r11,1 // r11 holds the return value 49*4882a593Smuzhiyun 50*4882a593Smuzhiyun l.lwz r6,0(r1) 51*4882a593Smuzhiyun l.lwz r4,4(r1) 52*4882a593Smuzhiyun l.lwz r3,8(r1) 53*4882a593Smuzhiyun l.jr r9 54*4882a593Smuzhiyun l.addi r1,r1,12 55*4882a593Smuzhiyun 56*4882a593Smuzhiyun .section .fixup, "ax" 57*4882a593Smuzhiyun99: 58*4882a593Smuzhiyun l.j 1b 59*4882a593Smuzhiyun l.nop 60*4882a593Smuzhiyun .previous 61*4882a593Smuzhiyun 62*4882a593Smuzhiyun .section __ex_table, "a" 63*4882a593Smuzhiyun .long 8b, 99b // read fault 64*4882a593Smuzhiyun .long 9b, 99b // write fault 65*4882a593Smuzhiyun .previous 66*4882a593Smuzhiyun 67*4882a593Smuzhiyun/* 68*4882a593Smuzhiyun * unsigned long clear_user(void *addr, unsigned long size) ; 69*4882a593Smuzhiyun * 70*4882a593Smuzhiyun * NOTE: it returns number of bytes NOT cleared !!! 71*4882a593Smuzhiyun */ 72*4882a593Smuzhiyun .global __clear_user 73*4882a593Smuzhiyun__clear_user: 74*4882a593Smuzhiyun l.addi r1,r1,-8 75*4882a593Smuzhiyun l.sw 0(r1),r4 76*4882a593Smuzhiyun l.sw 4(r1),r3 77*4882a593Smuzhiyun 78*4882a593Smuzhiyun2: l.sfeq r4,r0 79*4882a593Smuzhiyun l.bf 1f 80*4882a593Smuzhiyun l.addi r4,r4,-1 81*4882a593Smuzhiyun9: l.sb 0(r3),r0 82*4882a593Smuzhiyun l.j 2b 83*4882a593Smuzhiyun l.addi r3,r3,1 84*4882a593Smuzhiyun 85*4882a593Smuzhiyun1: 86*4882a593Smuzhiyun l.addi r11,r4,1 87*4882a593Smuzhiyun 88*4882a593Smuzhiyun l.lwz r4,0(r1) 89*4882a593Smuzhiyun l.lwz r3,4(r1) 90*4882a593Smuzhiyun l.jr r9 91*4882a593Smuzhiyun l.addi r1,r1,8 92*4882a593Smuzhiyun 93*4882a593Smuzhiyun .section .fixup, "ax" 94*4882a593Smuzhiyun99: 95*4882a593Smuzhiyun l.j 1b 96*4882a593Smuzhiyun l.nop 97*4882a593Smuzhiyun .previous 98*4882a593Smuzhiyun 99*4882a593Smuzhiyun .section __ex_table, "a" 100*4882a593Smuzhiyun .long 9b, 99b // write fault 101*4882a593Smuzhiyun .previous 102