2 * linux/arch/arm/lib/getuser.S
4 * Copyright (C) 2001 Russell King
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.
10 * Idea from x86 version, (C) Copyright 1998 Linus Torvalds
12 * These functions have a non-standard call interface to make them more
13 * efficient, especially as they return an error value in addition to
14 * the "real" return value.
18 * Inputs: r0 contains the address
19 * Outputs: r0 is the error code
20 * r2, r3 contains the zero-extended value
23 * No other registers must be altered. (see include/asm-arm/uaccess.h
24 * for specific ASM register usage).
26 * Note that ADDR_LIMIT is either 0 or 0xc0000000.
27 * Note also that it is intended that __get_user_bad is not global.
29 #include <asm/asm-offsets.h>
30 #include <asm/thread_info.h>
31 #include <asm/errno.h>
44 orr r2, r2, r3, lsl #8
46 orr r2, r3, r2, lsl #8
62 .section __ex_table, "a"
63 .long 1b, __get_user_bad
64 .long 2b, __get_user_bad
65 .long 3b, __get_user_bad
66 .long 4b, __get_user_bad