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77c93b2f G |
1 | /* |
2 | * linux/arch/unicore32/lib/copy_to_user.S | |
3 | * | |
4 | * Code specific to PKUnity SoC and UniCore ISA | |
5 | * | |
6 | * Copyright (C) 2001-2010 GUAN Xue-tao | |
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 | * | |
19 | * size_t __copy_to_user(void *to, const void *from, size_t n) | |
20 | * | |
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 | ldw.w \reg, [\ptr]+, #4 | |
38 | .endm | |
39 | ||
40 | .macro ldr4w ptr reg1 reg2 reg3 reg4 abort | |
41 | ldm.w (\reg1, \reg2, \reg3, \reg4), [\ptr]+ | |
42 | .endm | |
43 | ||
44 | .macro ldr8w ptr reg1 reg2 reg3 reg4 reg5 reg6 reg7 reg8 abort | |
45 | ldm.w (\reg1, \reg2, \reg3, \reg4, \reg5, \reg6, \reg7, \reg8), [\ptr]+ | |
46 | .endm | |
47 | ||
48 | .macro ldr1b ptr reg cond=al abort | |
49 | notcond \cond, .+8 | |
50 | ldb.w \reg, [\ptr]+, #1 | |
51 | .endm | |
52 | ||
53 | .macro str1w ptr reg abort | |
54 | strusr \reg, \ptr, 4, abort=\abort | |
55 | .endm | |
56 | ||
57 | .macro str8w ptr reg1 reg2 reg3 reg4 reg5 reg6 reg7 reg8 abort | |
58 | 100: stm.w (\reg1, \reg2, \reg3, \reg4, \reg5, \reg6, \reg7, \reg8), [\ptr]+ | |
59 | ||
60 | .pushsection __ex_table, "a" | |
61 | .long 100b, \abort | |
62 | .popsection | |
63 | .endm | |
64 | ||
65 | .macro str1b ptr reg cond=al abort | |
66 | strusr \reg, \ptr, 1, \cond, abort=\abort | |
67 | .endm | |
68 | ||
69 | .macro enter | |
70 | mov r3, #0 | |
71 | stm.w (r0, r2, r3), [sp-] | |
72 | .endm | |
73 | ||
74 | .macro exit | |
75 | add sp, sp, #8 | |
76 | ldm.w (r0), [sp]+ | |
77 | mov pc, lr | |
78 | .endm | |
79 | ||
80 | .text | |
81 | ||
82 | WEAK(__copy_to_user) | |
83 | ||
84 | #include "copy_template.S" | |
85 | ||
86 | ENDPROC(__copy_to_user) | |
87 | ||
88 | .pushsection .fixup,"ax" | |
89 | .align 0 | |
90 | copy_abort_preamble | |
91 | ldm.w (r1, r2, r3), [sp]+ | |
92 | sub r0, r0, r1 | |
93 | rsub r0, r0, r2 | |
94 | copy_abort_end | |
95 | .popsection | |
96 |