]>
Commit | Line | Data |
---|---|---|
77c93b2f G |
1 | /* |
2 | * linux/arch/unicore32/lib/copy_from_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 | * | |
2ef59f28 | 19 | * size_t raw_copy_from_user(void *to, const void *from, size_t n) |
77c93b2f G |
20 | * |
21 | * Purpose: | |
22 | * | |
23 | * copy a block to kernel memory from user memory | |
24 | * | |
25 | * Params: | |
26 | * | |
27 | * to = kernel memory | |
28 | * from = user 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 | ldrusr \reg, \ptr, 4, abort=\abort | |
38 | .endm | |
39 | ||
40 | .macro ldr4w ptr reg1 reg2 reg3 reg4 abort | |
41 | 100: ldm.w (\reg1, \reg2, \reg3, \reg4), [\ptr]+ | |
42 | .pushsection __ex_table, "a" | |
43 | .align 3 | |
44 | .long 100b, \abort | |
45 | .popsection | |
46 | .endm | |
47 | ||
48 | .macro ldr8w ptr reg1 reg2 reg3 reg4 reg5 reg6 reg7 reg8 abort | |
49 | 100: ldm.w (\reg1, \reg2, \reg3, \reg4, \reg5, \reg6, \reg7, \reg8), [\ptr]+ | |
50 | .pushsection __ex_table, "a" | |
51 | .align 3 | |
52 | .long 100b, \abort | |
53 | .popsection | |
54 | .endm | |
55 | ||
56 | .macro ldr1b ptr reg cond=al abort | |
57 | ldrusr \reg, \ptr, 1, \cond, abort=\abort | |
58 | .endm | |
59 | ||
60 | .macro str1w ptr reg abort | |
61 | stw.w \reg, [\ptr]+, #4 | |
62 | .endm | |
63 | ||
64 | .macro str8w ptr reg1 reg2 reg3 reg4 reg5 reg6 reg7 reg8 abort | |
65 | stm.w (\reg1, \reg2, \reg3, \reg4, \reg5, \reg6, \reg7, \reg8), [\ptr]+ | |
66 | .endm | |
67 | ||
68 | .macro str1b ptr reg cond=al abort | |
69 | .ifnc \cond, al | |
70 | b\cond 201f | |
71 | b 202f | |
72 | .endif | |
73 | 201: stb.w \reg, [\ptr]+, #1 | |
74 | 202: | |
75 | .endm | |
76 | ||
77 | .macro enter | |
78 | mov r3, #0 | |
79 | stm.w (r0, r2, r3), [sp-] | |
80 | .endm | |
81 | ||
82 | .macro exit | |
83 | add sp, sp, #8 | |
84 | ldm.w (r0), [sp]+ | |
85 | mov pc, lr | |
86 | .endm | |
87 | ||
88 | .text | |
89 | ||
2ef59f28 | 90 | ENTRY(raw_copy_from_user) |
77c93b2f G |
91 | |
92 | #include "copy_template.S" | |
93 | ||
2ef59f28 | 94 | ENDPROC(raw_copy_from_user) |
77c93b2f G |
95 | |
96 | .pushsection .fixup,"ax" | |
97 | .align 0 | |
98 | copy_abort_preamble | |
2ef59f28 AV |
99 | ldm.w (r1, r2, r3), [sp]+ |
100 | sub r0, r0, r1 | |
101 | rsub r0, r0, r2 | |
77c93b2f G |
102 | copy_abort_end |
103 | .popsection | |
104 |