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 * r2, r3 contains the value 20 * Outputs: r0 is the error code 21 * lr corrupted 22 * 23 * No other registers must be altered. (see <asm/uaccess.h> 24 * for specific ASM register usage). 25 * 26 * Note that ADDR_LIMIT is either 0 or 0xc0000000 27 * Note also that it is intended that __put_user_bad is not global. 28 */ 29#include <linux/linkage.h> 30#include <asm/errno.h> 31#include <asm/domain.h> 32 33ENTRY(__put_user_1) 341: TUSER(strb) r2, [r0] 35 mov r0, #0 36 mov pc, lr 37ENDPROC(__put_user_1) 38 39ENTRY(__put_user_2) 40 mov ip, r2, lsr #8 41#ifdef CONFIG_THUMB2_KERNEL 42#ifndef __ARMEB__ 432: TUSER(strb) r2, [r0] 443: TUSER(strb) ip, [r0, #1] 45#else 462: TUSER(strb) ip, [r0] 473: TUSER(strb) r2, [r0, #1] 48#endif 49#else /* !CONFIG_THUMB2_KERNEL */ 50#ifndef __ARMEB__ 512: TUSER(strb) r2, [r0], #1 523: TUSER(strb) ip, [r0] 53#else 542: TUSER(strb) ip, [r0], #1 553: TUSER(strb) r2, [r0] 56#endif 57#endif /* CONFIG_THUMB2_KERNEL */ 58 mov r0, #0 59 mov pc, lr 60ENDPROC(__put_user_2) 61 62ENTRY(__put_user_4) 634: TUSER(str) r2, [r0] 64 mov r0, #0 65 mov pc, lr 66ENDPROC(__put_user_4) 67 68ENTRY(__put_user_8) 69#ifdef CONFIG_THUMB2_KERNEL 705: TUSER(str) r2, [r0] 716: TUSER(str) r3, [r0, #4] 72#else 735: TUSER(str) r2, [r0], #4 746: TUSER(str) r3, [r0] 75#endif 76 mov r0, #0 77 mov pc, lr 78ENDPROC(__put_user_8) 79 80__put_user_bad: 81 mov r0, #-EFAULT 82 mov pc, lr 83ENDPROC(__put_user_bad) 84 85.pushsection __ex_table, "a" 86 .long 1b, __put_user_bad 87 .long 2b, __put_user_bad 88 .long 3b, __put_user_bad 89 .long 4b, __put_user_bad 90 .long 5b, __put_user_bad 91 .long 6b, __put_user_bad 92.popsection 93