11da177e4SLinus Torvalds/* 21da177e4SLinus Torvalds * linux/arch/arm/lib/putuser.S 31da177e4SLinus Torvalds * 41da177e4SLinus Torvalds * Copyright (C) 2001 Russell King 51da177e4SLinus Torvalds * 61da177e4SLinus Torvalds * This program is free software; you can redistribute it and/or modify 71da177e4SLinus Torvalds * it under the terms of the GNU General Public License version 2 as 81da177e4SLinus Torvalds * published by the Free Software Foundation. 91da177e4SLinus Torvalds * 101da177e4SLinus Torvalds * Idea from x86 version, (C) Copyright 1998 Linus Torvalds 111da177e4SLinus Torvalds * 121da177e4SLinus Torvalds * These functions have a non-standard call interface to make 131da177e4SLinus Torvalds * them more efficient, especially as they return an error 141da177e4SLinus Torvalds * value in addition to the "real" return value. 151da177e4SLinus Torvalds * 161da177e4SLinus Torvalds * __put_user_X 171da177e4SLinus Torvalds * 181da177e4SLinus Torvalds * Inputs: r0 contains the address 191da177e4SLinus Torvalds * r2, r3 contains the value 201da177e4SLinus Torvalds * Outputs: r0 is the error code 211da177e4SLinus Torvalds * lr corrupted 221da177e4SLinus Torvalds * 234baa9922SRussell King * No other registers must be altered. (see <asm/uaccess.h> 241da177e4SLinus Torvalds * for specific ASM register usage). 251da177e4SLinus Torvalds * 261da177e4SLinus Torvalds * Note that ADDR_LIMIT is either 0 or 0xc0000000 271da177e4SLinus Torvalds * Note also that it is intended that __put_user_bad is not global. 281da177e4SLinus Torvalds */ 2993ed3970SCatalin Marinas#include <linux/linkage.h> 301da177e4SLinus Torvalds#include <asm/errno.h> 31*247055aaSCatalin Marinas#include <asm/domain.h> 321da177e4SLinus Torvalds 3393ed3970SCatalin MarinasENTRY(__put_user_1) 34*247055aaSCatalin Marinas1: T(strb) r2, [r0] 351da177e4SLinus Torvalds mov r0, #0 361da177e4SLinus Torvalds mov pc, lr 3793ed3970SCatalin MarinasENDPROC(__put_user_1) 381da177e4SLinus Torvalds 3993ed3970SCatalin MarinasENTRY(__put_user_2) 401da177e4SLinus Torvalds mov ip, r2, lsr #8 418b592783SCatalin Marinas#ifdef CONFIG_THUMB2_KERNEL 428b592783SCatalin Marinas#ifndef __ARMEB__ 43*247055aaSCatalin Marinas2: T(strb) r2, [r0] 44*247055aaSCatalin Marinas3: T(strb) ip, [r0, #1] 458b592783SCatalin Marinas#else 46*247055aaSCatalin Marinas2: T(strb) ip, [r0] 47*247055aaSCatalin Marinas3: T(strb) r2, [r0, #1] 488b592783SCatalin Marinas#endif 498b592783SCatalin Marinas#else /* !CONFIG_THUMB2_KERNEL */ 501da177e4SLinus Torvalds#ifndef __ARMEB__ 51*247055aaSCatalin Marinas2: T(strb) r2, [r0], #1 52*247055aaSCatalin Marinas3: T(strb) ip, [r0] 531da177e4SLinus Torvalds#else 54*247055aaSCatalin Marinas2: T(strb) ip, [r0], #1 55*247055aaSCatalin Marinas3: T(strb) r2, [r0] 561da177e4SLinus Torvalds#endif 578b592783SCatalin Marinas#endif /* CONFIG_THUMB2_KERNEL */ 581da177e4SLinus Torvalds mov r0, #0 591da177e4SLinus Torvalds mov pc, lr 6093ed3970SCatalin MarinasENDPROC(__put_user_2) 611da177e4SLinus Torvalds 6293ed3970SCatalin MarinasENTRY(__put_user_4) 63*247055aaSCatalin Marinas4: T(str) r2, [r0] 641da177e4SLinus Torvalds mov r0, #0 651da177e4SLinus Torvalds mov pc, lr 6693ed3970SCatalin MarinasENDPROC(__put_user_4) 671da177e4SLinus Torvalds 6893ed3970SCatalin MarinasENTRY(__put_user_8) 698b592783SCatalin Marinas#ifdef CONFIG_THUMB2_KERNEL 70*247055aaSCatalin Marinas5: T(str) r2, [r0] 71*247055aaSCatalin Marinas6: T(str) r3, [r0, #4] 728b592783SCatalin Marinas#else 73*247055aaSCatalin Marinas5: T(str) r2, [r0], #4 74*247055aaSCatalin Marinas6: T(str) r3, [r0] 758b592783SCatalin Marinas#endif 761da177e4SLinus Torvalds mov r0, #0 771da177e4SLinus Torvalds mov pc, lr 7893ed3970SCatalin MarinasENDPROC(__put_user_8) 791da177e4SLinus Torvalds 801da177e4SLinus Torvalds__put_user_bad: 811da177e4SLinus Torvalds mov r0, #-EFAULT 821da177e4SLinus Torvalds mov pc, lr 8393ed3970SCatalin MarinasENDPROC(__put_user_bad) 841da177e4SLinus Torvalds 854260415fSRussell King.pushsection __ex_table, "a" 861da177e4SLinus Torvalds .long 1b, __put_user_bad 871da177e4SLinus Torvalds .long 2b, __put_user_bad 881da177e4SLinus Torvalds .long 3b, __put_user_bad 891da177e4SLinus Torvalds .long 4b, __put_user_bad 901da177e4SLinus Torvalds .long 5b, __put_user_bad 911da177e4SLinus Torvalds .long 6b, __put_user_bad 924260415fSRussell King.popsection 93