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