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 198404663fSRussell King * r1 contains the address limit, which must be preserved 201da177e4SLinus Torvalds * r2, r3 contains the value 211da177e4SLinus Torvalds * Outputs: r0 is the error code 221da177e4SLinus Torvalds * lr corrupted 231da177e4SLinus Torvalds * 244baa9922SRussell King * No other registers must be altered. (see <asm/uaccess.h> 251da177e4SLinus Torvalds * for specific ASM register usage). 261da177e4SLinus Torvalds * 271da177e4SLinus Torvalds * Note that ADDR_LIMIT is either 0 or 0xc0000000 281da177e4SLinus Torvalds * Note also that it is intended that __put_user_bad is not global. 291da177e4SLinus Torvalds */ 3093ed3970SCatalin Marinas#include <linux/linkage.h> 318404663fSRussell King#include <asm/assembler.h> 321da177e4SLinus Torvalds#include <asm/errno.h> 33247055aaSCatalin Marinas#include <asm/domain.h> 341da177e4SLinus Torvalds 3593ed3970SCatalin MarinasENTRY(__put_user_1) 368404663fSRussell King check_uaccess r0, 1, r1, ip, __put_user_bad 374e7682d0SCatalin Marinas1: TUSER(strb) r2, [r0] 381da177e4SLinus Torvalds mov r0, #0 391da177e4SLinus Torvalds mov pc, lr 4093ed3970SCatalin MarinasENDPROC(__put_user_1) 411da177e4SLinus Torvalds 4293ed3970SCatalin MarinasENTRY(__put_user_2) 438404663fSRussell King check_uaccess r0, 2, r1, ip, __put_user_bad 441da177e4SLinus Torvalds mov ip, r2, lsr #8 458b592783SCatalin Marinas#ifdef CONFIG_THUMB2_KERNEL 468b592783SCatalin Marinas#ifndef __ARMEB__ 474e7682d0SCatalin Marinas2: TUSER(strb) r2, [r0] 484e7682d0SCatalin Marinas3: TUSER(strb) ip, [r0, #1] 498b592783SCatalin Marinas#else 504e7682d0SCatalin Marinas2: TUSER(strb) ip, [r0] 514e7682d0SCatalin Marinas3: TUSER(strb) r2, [r0, #1] 528b592783SCatalin Marinas#endif 538b592783SCatalin Marinas#else /* !CONFIG_THUMB2_KERNEL */ 541da177e4SLinus Torvalds#ifndef __ARMEB__ 554e7682d0SCatalin Marinas2: TUSER(strb) r2, [r0], #1 564e7682d0SCatalin Marinas3: TUSER(strb) ip, [r0] 571da177e4SLinus Torvalds#else 584e7682d0SCatalin Marinas2: TUSER(strb) ip, [r0], #1 594e7682d0SCatalin Marinas3: TUSER(strb) r2, [r0] 601da177e4SLinus Torvalds#endif 618b592783SCatalin Marinas#endif /* CONFIG_THUMB2_KERNEL */ 621da177e4SLinus Torvalds mov r0, #0 631da177e4SLinus Torvalds mov pc, lr 6493ed3970SCatalin MarinasENDPROC(__put_user_2) 651da177e4SLinus Torvalds 6693ed3970SCatalin MarinasENTRY(__put_user_4) 678404663fSRussell King check_uaccess r0, 4, r1, ip, __put_user_bad 684e7682d0SCatalin Marinas4: TUSER(str) r2, [r0] 691da177e4SLinus Torvalds mov r0, #0 701da177e4SLinus Torvalds mov pc, lr 7193ed3970SCatalin MarinasENDPROC(__put_user_4) 721da177e4SLinus Torvalds 7393ed3970SCatalin MarinasENTRY(__put_user_8) 748404663fSRussell King check_uaccess r0, 8, r1, ip, __put_user_bad 758b592783SCatalin Marinas#ifdef CONFIG_THUMB2_KERNEL 764e7682d0SCatalin Marinas5: TUSER(str) r2, [r0] 774e7682d0SCatalin Marinas6: TUSER(str) r3, [r0, #4] 788b592783SCatalin Marinas#else 794e7682d0SCatalin Marinas5: TUSER(str) r2, [r0], #4 804e7682d0SCatalin Marinas6: TUSER(str) r3, [r0] 818b592783SCatalin Marinas#endif 821da177e4SLinus Torvalds mov r0, #0 831da177e4SLinus Torvalds mov pc, lr 8493ed3970SCatalin MarinasENDPROC(__put_user_8) 851da177e4SLinus Torvalds 861da177e4SLinus Torvalds__put_user_bad: 871da177e4SLinus Torvalds mov r0, #-EFAULT 881da177e4SLinus Torvalds mov pc, lr 8993ed3970SCatalin MarinasENDPROC(__put_user_bad) 901da177e4SLinus Torvalds 914260415fSRussell King.pushsection __ex_table, "a" 921da177e4SLinus Torvalds .long 1b, __put_user_bad 931da177e4SLinus Torvalds .long 2b, __put_user_bad 941da177e4SLinus Torvalds .long 3b, __put_user_bad 951da177e4SLinus Torvalds .long 4b, __put_user_bad 961da177e4SLinus Torvalds .long 5b, __put_user_bad 971da177e4SLinus Torvalds .long 6b, __put_user_bad 984260415fSRussell King.popsection 99