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 <asm/errno.h> 30 31 .global __put_user_1 32__put_user_1: 331: strbt r2, [r0] 34 mov r0, #0 35 mov pc, lr 36 37 .global __put_user_2 38__put_user_2: 39 mov ip, r2, lsr #8 40#ifndef __ARMEB__ 412: strbt r2, [r0], #1 423: strbt ip, [r0] 43#else 442: strbt ip, [r0], #1 453: strbt r2, [r0] 46#endif 47 mov r0, #0 48 mov pc, lr 49 50 .global __put_user_4 51__put_user_4: 524: strt r2, [r0] 53 mov r0, #0 54 mov pc, lr 55 56 .global __put_user_8 57__put_user_8: 585: strt r2, [r0], #4 596: strt r3, [r0] 60 mov r0, #0 61 mov pc, lr 62 63__put_user_bad: 64 mov r0, #-EFAULT 65 mov pc, lr 66 67.section __ex_table, "a" 68 .long 1b, __put_user_bad 69 .long 2b, __put_user_bad 70 .long 3b, __put_user_bad 71 .long 4b, __put_user_bad 72 .long 5b, __put_user_bad 73 .long 6b, __put_user_bad 74.previous 75