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Nicolas Pitrefadab092005-11-01 19:52:24 +00001/*
2 * linux/arch/arm/lib/copy_to_user.S
3 *
4 * Author: Nicolas Pitre
5 * Created: Sep 29, 2005
6 * Copyright: MontaVista Software, Inc.
7 *
8 * This program is free software; you can redistribute it and/or modify
9 * it under the terms of the GNU General Public License version 2 as
10 * published by the Free Software Foundation.
11 */
12
13#include <linux/linkage.h>
14#include <asm/assembler.h>
15
16/*
17 * Prototype:
18 *
Russell King02fcb972006-06-21 14:44:52 +010019 * size_t __copy_to_user(void *to, const void *from, size_t n)
Nicolas Pitrefadab092005-11-01 19:52:24 +000020 *
21 * Purpose:
22 *
23 * copy a block to user memory from kernel memory
24 *
25 * Params:
26 *
27 * to = user memory
28 * from = kernel memory
29 * n = number of bytes to copy
30 *
31 * Return value:
32 *
33 * Number of bytes NOT copied.
34 */
35
Catalin Marinas8b592782009-07-24 12:32:57 +010036#define LDR1W_SHIFT 0
37#ifndef CONFIG_THUMB2_KERNEL
38#define STR1W_SHIFT 0
39#else
40#define STR1W_SHIFT 1
41#endif
42
Nicolas Pitrefadab092005-11-01 19:52:24 +000043 .macro ldr1w ptr reg abort
Catalin Marinas8b592782009-07-24 12:32:57 +010044 W(ldr) \reg, [\ptr], #4
Nicolas Pitrefadab092005-11-01 19:52:24 +000045 .endm
46
47 .macro ldr4w ptr reg1 reg2 reg3 reg4 abort
48 ldmia \ptr!, {\reg1, \reg2, \reg3, \reg4}
49 .endm
50
51 .macro ldr8w ptr reg1 reg2 reg3 reg4 reg5 reg6 reg7 reg8 abort
52 ldmia \ptr!, {\reg1, \reg2, \reg3, \reg4, \reg5, \reg6, \reg7, \reg8}
53 .endm
54
55 .macro ldr1b ptr reg cond=al abort
56 ldr\cond\()b \reg, [\ptr], #1
57 .endm
58
59 .macro str1w ptr reg abort
Catalin Marinas8b592782009-07-24 12:32:57 +010060 strusr \reg, \ptr, 4, abort=\abort
Nicolas Pitrefadab092005-11-01 19:52:24 +000061 .endm
62
63 .macro str8w ptr reg1 reg2 reg3 reg4 reg5 reg6 reg7 reg8 abort
64 str1w \ptr, \reg1, \abort
65 str1w \ptr, \reg2, \abort
66 str1w \ptr, \reg3, \abort
67 str1w \ptr, \reg4, \abort
68 str1w \ptr, \reg5, \abort
69 str1w \ptr, \reg6, \abort
70 str1w \ptr, \reg7, \abort
71 str1w \ptr, \reg8, \abort
72 .endm
73
74 .macro str1b ptr reg cond=al abort
Catalin Marinas8b592782009-07-24 12:32:57 +010075 strusr \reg, \ptr, 1, \cond, abort=\abort
Nicolas Pitrefadab092005-11-01 19:52:24 +000076 .endm
77
78 .macro enter reg1 reg2
79 mov r3, #0
80 stmdb sp!, {r0, r2, r3, \reg1, \reg2}
81 .endm
82
83 .macro exit reg1 reg2
84 add sp, sp, #8
85 ldmfd sp!, {r0, \reg1, \reg2}
86 .endm
87
88 .text
89
Nicolas Pitrea1f98842009-03-08 22:34:45 -040090ENTRY(__copy_to_user_std)
91WEAK(__copy_to_user)
Nicolas Pitrefadab092005-11-01 19:52:24 +000092
93#include "copy_template.S"
94
Catalin Marinas93ed3972008-08-28 11:22:32 +010095ENDPROC(__copy_to_user)
Catalin Marinase814d822010-05-07 10:52:32 +010096ENDPROC(__copy_to_user_std)
Catalin Marinas93ed3972008-08-28 11:22:32 +010097
Russell King42604152010-04-19 10:15:03 +010098 .pushsection .fixup,"ax"
Nicolas Pitrefadab092005-11-01 19:52:24 +000099 .align 0
100 copy_abort_preamble
101 ldmfd sp!, {r1, r2, r3}
102 sub r0, r0, r1
103 rsb r0, r0, r2
104 copy_abort_end
Russell King42604152010-04-19 10:15:03 +0100105 .popsection
Nicolas Pitrefadab092005-11-01 19:52:24 +0000106