1*4882a593Smuzhiyun/* SPDX-License-Identifier: GPL-2.0-only */ 2*4882a593Smuzhiyun/* 3*4882a593Smuzhiyun * linux/arch/arm/lib/putuser.S 4*4882a593Smuzhiyun * 5*4882a593Smuzhiyun * Copyright (C) 2001 Russell King 6*4882a593Smuzhiyun * 7*4882a593Smuzhiyun * Idea from x86 version, (C) Copyright 1998 Linus Torvalds 8*4882a593Smuzhiyun * 9*4882a593Smuzhiyun * These functions have a non-standard call interface to make 10*4882a593Smuzhiyun * them more efficient, especially as they return an error 11*4882a593Smuzhiyun * value in addition to the "real" return value. 12*4882a593Smuzhiyun * 13*4882a593Smuzhiyun * __put_user_X 14*4882a593Smuzhiyun * 15*4882a593Smuzhiyun * Inputs: r0 contains the address 16*4882a593Smuzhiyun * r1 contains the address limit, which must be preserved 17*4882a593Smuzhiyun * r2, r3 contains the value 18*4882a593Smuzhiyun * Outputs: r0 is the error code 19*4882a593Smuzhiyun * lr corrupted 20*4882a593Smuzhiyun * 21*4882a593Smuzhiyun * No other registers must be altered. (see <asm/uaccess.h> 22*4882a593Smuzhiyun * for specific ASM register usage). 23*4882a593Smuzhiyun * 24*4882a593Smuzhiyun * Note that ADDR_LIMIT is either 0 or 0xc0000000 25*4882a593Smuzhiyun * Note also that it is intended that __put_user_bad is not global. 26*4882a593Smuzhiyun */ 27*4882a593Smuzhiyun#include <linux/linkage.h> 28*4882a593Smuzhiyun#include <asm/assembler.h> 29*4882a593Smuzhiyun#include <asm/errno.h> 30*4882a593Smuzhiyun#include <asm/domain.h> 31*4882a593Smuzhiyun 32*4882a593SmuzhiyunENTRY(__put_user_1) 33*4882a593Smuzhiyun check_uaccess r0, 1, r1, ip, __put_user_bad 34*4882a593Smuzhiyun1: TUSER(strb) r2, [r0] 35*4882a593Smuzhiyun mov r0, #0 36*4882a593Smuzhiyun ret lr 37*4882a593SmuzhiyunENDPROC(__put_user_1) 38*4882a593Smuzhiyun 39*4882a593SmuzhiyunENTRY(__put_user_2) 40*4882a593Smuzhiyun check_uaccess r0, 2, r1, ip, __put_user_bad 41*4882a593Smuzhiyun#if __LINUX_ARM_ARCH__ >= 6 42*4882a593Smuzhiyun 43*4882a593Smuzhiyun2: TUSER(strh) r2, [r0] 44*4882a593Smuzhiyun 45*4882a593Smuzhiyun#else 46*4882a593Smuzhiyun 47*4882a593Smuzhiyun mov ip, r2, lsr #8 48*4882a593Smuzhiyun#ifndef __ARMEB__ 49*4882a593Smuzhiyun2: TUSER(strb) r2, [r0], #1 50*4882a593Smuzhiyun3: TUSER(strb) ip, [r0] 51*4882a593Smuzhiyun#else 52*4882a593Smuzhiyun2: TUSER(strb) ip, [r0], #1 53*4882a593Smuzhiyun3: TUSER(strb) r2, [r0] 54*4882a593Smuzhiyun#endif 55*4882a593Smuzhiyun 56*4882a593Smuzhiyun#endif /* __LINUX_ARM_ARCH__ >= 6 */ 57*4882a593Smuzhiyun mov r0, #0 58*4882a593Smuzhiyun ret lr 59*4882a593SmuzhiyunENDPROC(__put_user_2) 60*4882a593Smuzhiyun 61*4882a593SmuzhiyunENTRY(__put_user_4) 62*4882a593Smuzhiyun check_uaccess r0, 4, r1, ip, __put_user_bad 63*4882a593Smuzhiyun4: TUSER(str) r2, [r0] 64*4882a593Smuzhiyun mov r0, #0 65*4882a593Smuzhiyun ret lr 66*4882a593SmuzhiyunENDPROC(__put_user_4) 67*4882a593Smuzhiyun 68*4882a593SmuzhiyunENTRY(__put_user_8) 69*4882a593Smuzhiyun check_uaccess r0, 8, r1, ip, __put_user_bad 70*4882a593Smuzhiyun#ifdef CONFIG_THUMB2_KERNEL 71*4882a593Smuzhiyun5: TUSER(str) r2, [r0] 72*4882a593Smuzhiyun6: TUSER(str) r3, [r0, #4] 73*4882a593Smuzhiyun#else 74*4882a593Smuzhiyun5: TUSER(str) r2, [r0], #4 75*4882a593Smuzhiyun6: TUSER(str) r3, [r0] 76*4882a593Smuzhiyun#endif 77*4882a593Smuzhiyun mov r0, #0 78*4882a593Smuzhiyun ret lr 79*4882a593SmuzhiyunENDPROC(__put_user_8) 80*4882a593Smuzhiyun 81*4882a593Smuzhiyun__put_user_bad: 82*4882a593Smuzhiyun mov r0, #-EFAULT 83*4882a593Smuzhiyun ret lr 84*4882a593SmuzhiyunENDPROC(__put_user_bad) 85*4882a593Smuzhiyun 86*4882a593Smuzhiyun.pushsection __ex_table, "a" 87*4882a593Smuzhiyun .long 1b, __put_user_bad 88*4882a593Smuzhiyun .long 2b, __put_user_bad 89*4882a593Smuzhiyun#if __LINUX_ARM_ARCH__ < 6 90*4882a593Smuzhiyun .long 3b, __put_user_bad 91*4882a593Smuzhiyun#endif 92*4882a593Smuzhiyun .long 4b, __put_user_bad 93*4882a593Smuzhiyun .long 5b, __put_user_bad 94*4882a593Smuzhiyun .long 6b, __put_user_bad 95*4882a593Smuzhiyun.popsection 96