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