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