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/arch/arm/lib/putuser.S

https://bitbucket.org/evzijst/gittest
Assembly | 76 lines | 70 code | 6 blank | 0 comment | 1 complexity | 5a8574ab2275201e04fa12618949f607 MD5 | raw file
 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 include/asm-arm/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/constants.h>
30#include <asm/thread_info.h>
31#include <asm/errno.h>
32
33	.global	__put_user_1
34__put_user_1:
351:	strbt	r2, [r0]
36	mov	r0, #0
37	mov	pc, lr
38
39	.global	__put_user_2
40__put_user_2:
41	mov	ip, r2, lsr #8
42#ifndef __ARMEB__
432:	strbt	r2, [r0], #1
443:	strbt	ip, [r0]
45#else
462:	strbt	ip, [r0], #1
473:	strbt	r2, [r0]
48#endif
49	mov	r0, #0
50	mov	pc, lr
51
52	.global	__put_user_4
53__put_user_4:
544:	strt	r2, [r0]
55	mov	r0, #0
56	mov	pc, lr
57
58	.global	__put_user_8
59__put_user_8:
605:	strt	r2, [r0], #4
616:	strt	r3, [r0]
62	mov	r0, #0
63	mov	pc, lr
64
65__put_user_bad:
66	mov	r0, #-EFAULT
67	mov	pc, lr
68
69.section __ex_table, "a"
70	.long	1b, __put_user_bad
71	.long	2b, __put_user_bad
72	.long	3b, __put_user_bad
73	.long	4b, __put_user_bad
74	.long	5b, __put_user_bad
75	.long	6b, __put_user_bad
76.previous