1/* 2 * linux/arch/arm/lib/putuser.S 3 * 4 * Copyright (C) 2001 Russell King 5 * 6 * This program is free software; you can redistribute it and/or modify 7 * it under the terms of the GNU General Public License version 2 as 8 * published by the Free Software Foundation. 9 * 10 * Idea from x86 version, (C) Copyright 1998 Linus Torvalds 11 * 12 * These functions have a non-standard call interface to make 13 * them more efficient, especially as they return an error 14 * value in addition to the "real" return value. 15 * 16 * __put_user_X 17 * 18 * Inputs: r0 contains the address 19 * r1 contains the address limit, which must be preserved 20 * r2, r3 contains the value 21 * Outputs: r0 is the error code 22 * lr corrupted 23 * 24 * No other registers must be altered. (see <asm/uaccess.h> 25 * for specific ASM register usage). 26 * 27 * Note that ADDR_LIMIT is either 0 or 0xc0000000 28 * Note also that it is intended that __put_user_bad is not global. 29 */ 30#include <linux/linkage.h> 31#include <asm/assembler.h> 32#include <asm/errno.h> 33#include <asm/domain.h> 34#include <asm/export.h> 35 36ENTRY(__put_user_1) 37 check_uaccess r0, 1, r1, ip, __put_user_bad 381: TUSER(strb) r2, [r0] 39 mov r0, #0 40 ret lr 41ENDPROC(__put_user_1) 42EXPORT_SYMBOL(__put_user_1) 43 44ENTRY(__put_user_2) 45 check_uaccess r0, 2, r1, ip, __put_user_bad 46 mov ip, r2, lsr #8 47#ifdef CONFIG_THUMB2_KERNEL 48#ifndef __ARMEB__ 492: TUSER(strb) r2, [r0] 503: TUSER(strb) ip, [r0, #1] 51#else 522: TUSER(strb) ip, [r0] 533: TUSER(strb) r2, [r0, #1] 54#endif 55#else /* !CONFIG_THUMB2_KERNEL */ 56#ifndef __ARMEB__ 572: TUSER(strb) r2, [r0], #1 583: TUSER(strb) ip, [r0] 59#else 602: TUSER(strb) ip, [r0], #1 613: TUSER(strb) r2, [r0] 62#endif 63#endif /* CONFIG_THUMB2_KERNEL */ 64 mov r0, #0 65 ret lr 66ENDPROC(__put_user_2) 67EXPORT_SYMBOL(__put_user_2) 68 69ENTRY(__put_user_4) 70 check_uaccess r0, 4, r1, ip, __put_user_bad 714: TUSER(str) r2, [r0] 72 mov r0, #0 73 ret lr 74ENDPROC(__put_user_4) 75EXPORT_SYMBOL(__put_user_4) 76 77ENTRY(__put_user_8) 78 check_uaccess r0, 8, r1, ip, __put_user_bad 79#ifdef CONFIG_THUMB2_KERNEL 805: TUSER(str) r2, [r0] 816: TUSER(str) r3, [r0, #4] 82#else 835: TUSER(str) r2, [r0], #4 846: TUSER(str) r3, [r0] 85#endif 86 mov r0, #0 87 ret lr 88ENDPROC(__put_user_8) 89EXPORT_SYMBOL(__put_user_8) 90 91__put_user_bad: 92 mov r0, #-EFAULT 93 ret lr 94ENDPROC(__put_user_bad) 95 96.pushsection __ex_table, "a" 97 .long 1b, __put_user_bad 98 .long 2b, __put_user_bad 99 .long 3b, __put_user_bad 100 .long 4b, __put_user_bad 101 .long 5b, __put_user_bad 102 .long 6b, __put_user_bad 103.popsection 104