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fadab094 NP |
1 | /* |
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> | |
279f487e | 15 | #include <asm/unwind.h> |
4dd1837d | 16 | #include <asm/export.h> |
fadab094 NP |
17 | |
18 | /* | |
19 | * Prototype: | |
20 | * | |
3fba7e23 | 21 | * size_t arm_copy_to_user(void *to, const void *from, size_t n) |
fadab094 NP |
22 | * |
23 | * Purpose: | |
24 | * | |
25 | * copy a block to user memory from kernel memory | |
26 | * | |
27 | * Params: | |
28 | * | |
29 | * to = user memory | |
30 | * from = kernel memory | |
31 | * n = number of bytes to copy | |
32 | * | |
33 | * Return value: | |
34 | * | |
35 | * Number of bytes NOT copied. | |
36 | */ | |
37 | ||
8b592783 CM |
38 | #define LDR1W_SHIFT 0 |
39 | #ifndef CONFIG_THUMB2_KERNEL | |
40 | #define STR1W_SHIFT 0 | |
41 | #else | |
42 | #define STR1W_SHIFT 1 | |
43 | #endif | |
44 | ||
fadab094 | 45 | .macro ldr1w ptr reg abort |
8b592783 | 46 | W(ldr) \reg, [\ptr], #4 |
fadab094 NP |
47 | .endm |
48 | ||
49 | .macro ldr4w ptr reg1 reg2 reg3 reg4 abort | |
50 | ldmia \ptr!, {\reg1, \reg2, \reg3, \reg4} | |
51 | .endm | |
52 | ||
53 | .macro ldr8w ptr reg1 reg2 reg3 reg4 reg5 reg6 reg7 reg8 abort | |
54 | ldmia \ptr!, {\reg1, \reg2, \reg3, \reg4, \reg5, \reg6, \reg7, \reg8} | |
55 | .endm | |
56 | ||
57 | .macro ldr1b ptr reg cond=al abort | |
58 | ldr\cond\()b \reg, [\ptr], #1 | |
59 | .endm | |
60 | ||
61 | .macro str1w ptr reg abort | |
8b592783 | 62 | strusr \reg, \ptr, 4, abort=\abort |
fadab094 NP |
63 | .endm |
64 | ||
65 | .macro str8w ptr reg1 reg2 reg3 reg4 reg5 reg6 reg7 reg8 abort | |
66 | str1w \ptr, \reg1, \abort | |
67 | str1w \ptr, \reg2, \abort | |
68 | str1w \ptr, \reg3, \abort | |
69 | str1w \ptr, \reg4, \abort | |
70 | str1w \ptr, \reg5, \abort | |
71 | str1w \ptr, \reg6, \abort | |
72 | str1w \ptr, \reg7, \abort | |
73 | str1w \ptr, \reg8, \abort | |
74 | .endm | |
75 | ||
76 | .macro str1b ptr reg cond=al abort | |
8b592783 | 77 | strusr \reg, \ptr, 1, \cond, abort=\abort |
fadab094 NP |
78 | .endm |
79 | ||
80 | .macro enter reg1 reg2 | |
81 | mov r3, #0 | |
82 | stmdb sp!, {r0, r2, r3, \reg1, \reg2} | |
83 | .endm | |
84 | ||
279f487e LY |
85 | .macro usave reg1 reg2 |
86 | UNWIND( .save {r0, r2, r3, \reg1, \reg2} ) | |
87 | .endm | |
88 | ||
fadab094 NP |
89 | .macro exit reg1 reg2 |
90 | add sp, sp, #8 | |
91 | ldmfd sp!, {r0, \reg1, \reg2} | |
92 | .endm | |
93 | ||
94 | .text | |
95 | ||
a1f98849 | 96 | ENTRY(__copy_to_user_std) |
3fba7e23 | 97 | WEAK(arm_copy_to_user) |
fadab094 NP |
98 | |
99 | #include "copy_template.S" | |
100 | ||
3fba7e23 | 101 | ENDPROC(arm_copy_to_user) |
e814d826 | 102 | ENDPROC(__copy_to_user_std) |
4dd1837d AV |
103 | #ifndef CONFIG_UACCESS_WITH_MEMCPY |
104 | EXPORT_SYMBOL(arm_copy_to_user) | |
105 | #endif | |
93ed3970 | 106 | |
c4a84ae3 | 107 | .pushsection .text.fixup,"ax" |
fadab094 NP |
108 | .align 0 |
109 | copy_abort_preamble | |
110 | ldmfd sp!, {r1, r2, r3} | |
111 | sub r0, r0, r1 | |
112 | rsb r0, r0, r2 | |
113 | copy_abort_end | |
4260415f | 114 | .popsection |
fadab094 | 115 |