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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
36 .macro ldr1w ptr reg abort
37 ldr \reg, [\ptr], #4
38 .endm
39
40 .macro ldr4w ptr reg1 reg2 reg3 reg4 abort
41 ldmia \ptr!, {\reg1, \reg2, \reg3, \reg4}
42 .endm
43
44 .macro ldr8w ptr reg1 reg2 reg3 reg4 reg5 reg6 reg7 reg8 abort
45 ldmia \ptr!, {\reg1, \reg2, \reg3, \reg4, \reg5, \reg6, \reg7, \reg8}
46 .endm
47
48 .macro ldr1b ptr reg cond=al abort
49 ldr\cond\()b \reg, [\ptr], #1
50 .endm
51
52 .macro str1w ptr reg abort
53100: strt \reg, [\ptr], #4
54 .section __ex_table, "a"
55 .long 100b, \abort
56 .previous
57 .endm
58
59 .macro str8w ptr reg1 reg2 reg3 reg4 reg5 reg6 reg7 reg8 abort
60 str1w \ptr, \reg1, \abort
61 str1w \ptr, \reg2, \abort
62 str1w \ptr, \reg3, \abort
63 str1w \ptr, \reg4, \abort
64 str1w \ptr, \reg5, \abort
65 str1w \ptr, \reg6, \abort
66 str1w \ptr, \reg7, \abort
67 str1w \ptr, \reg8, \abort
68 .endm
69
70 .macro str1b ptr reg cond=al abort
71100: str\cond\()bt \reg, [\ptr], #1
72 .section __ex_table, "a"
73 .long 100b, \abort
74 .previous
75 .endm
76
77 .macro enter reg1 reg2
78 mov r3, #0
79 stmdb sp!, {r0, r2, r3, \reg1, \reg2}
80 .endm
81
82 .macro exit reg1 reg2
83 add sp, sp, #8
84 ldmfd sp!, {r0, \reg1, \reg2}
85 .endm
86
87 .text
88
Russell King02fcb972006-06-21 14:44:52 +010089ENTRY(__copy_to_user)
Nicolas Pitrefadab092005-11-01 19:52:24 +000090
91#include "copy_template.S"
92
93 .section .fixup,"ax"
94 .align 0
95 copy_abort_preamble
96 ldmfd sp!, {r1, r2, r3}
97 sub r0, r0, r1
98 rsb r0, r0, r2
99 copy_abort_end
100 .previous
101