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d2912cb1 | 1 | /* SPDX-License-Identifier: GPL-2.0-only */ |
77c93b2f G |
2 | /* |
3 | * linux/arch/unicore32/lib/copy_from_user.S | |
4 | * | |
5 | * Code specific to PKUnity SoC and UniCore ISA | |
6 | * | |
7 | * Copyright (C) 2001-2010 GUAN Xue-tao | |
77c93b2f G |
8 | */ |
9 | ||
10 | #include <linux/linkage.h> | |
11 | #include <asm/assembler.h> | |
12 | ||
13 | /* | |
14 | * Prototype: | |
15 | * | |
2ef59f28 | 16 | * size_t raw_copy_from_user(void *to, const void *from, size_t n) |
77c93b2f G |
17 | * |
18 | * Purpose: | |
19 | * | |
20 | * copy a block to kernel memory from user memory | |
21 | * | |
22 | * Params: | |
23 | * | |
24 | * to = kernel memory | |
25 | * from = user memory | |
26 | * n = number of bytes to copy | |
27 | * | |
28 | * Return value: | |
29 | * | |
30 | * Number of bytes NOT copied. | |
31 | */ | |
32 | ||
33 | .macro ldr1w ptr reg abort | |
34 | ldrusr \reg, \ptr, 4, abort=\abort | |
35 | .endm | |
36 | ||
37 | .macro ldr4w ptr reg1 reg2 reg3 reg4 abort | |
38 | 100: ldm.w (\reg1, \reg2, \reg3, \reg4), [\ptr]+ | |
39 | .pushsection __ex_table, "a" | |
40 | .align 3 | |
41 | .long 100b, \abort | |
42 | .popsection | |
43 | .endm | |
44 | ||
45 | .macro ldr8w ptr reg1 reg2 reg3 reg4 reg5 reg6 reg7 reg8 abort | |
46 | 100: ldm.w (\reg1, \reg2, \reg3, \reg4, \reg5, \reg6, \reg7, \reg8), [\ptr]+ | |
47 | .pushsection __ex_table, "a" | |
48 | .align 3 | |
49 | .long 100b, \abort | |
50 | .popsection | |
51 | .endm | |
52 | ||
53 | .macro ldr1b ptr reg cond=al abort | |
54 | ldrusr \reg, \ptr, 1, \cond, abort=\abort | |
55 | .endm | |
56 | ||
57 | .macro str1w ptr reg abort | |
58 | stw.w \reg, [\ptr]+, #4 | |
59 | .endm | |
60 | ||
61 | .macro str8w ptr reg1 reg2 reg3 reg4 reg5 reg6 reg7 reg8 abort | |
62 | stm.w (\reg1, \reg2, \reg3, \reg4, \reg5, \reg6, \reg7, \reg8), [\ptr]+ | |
63 | .endm | |
64 | ||
65 | .macro str1b ptr reg cond=al abort | |
66 | .ifnc \cond, al | |
67 | b\cond 201f | |
68 | b 202f | |
69 | .endif | |
70 | 201: stb.w \reg, [\ptr]+, #1 | |
71 | 202: | |
72 | .endm | |
73 | ||
74 | .macro enter | |
75 | mov r3, #0 | |
76 | stm.w (r0, r2, r3), [sp-] | |
77 | .endm | |
78 | ||
79 | .macro exit | |
80 | add sp, sp, #8 | |
81 | ldm.w (r0), [sp]+ | |
82 | mov pc, lr | |
83 | .endm | |
84 | ||
85 | .text | |
86 | ||
2ef59f28 | 87 | ENTRY(raw_copy_from_user) |
77c93b2f G |
88 | |
89 | #include "copy_template.S" | |
90 | ||
2ef59f28 | 91 | ENDPROC(raw_copy_from_user) |
77c93b2f G |
92 | |
93 | .pushsection .fixup,"ax" | |
94 | .align 0 | |
95 | copy_abort_preamble | |
2ef59f28 AV |
96 | ldm.w (r1, r2, r3), [sp]+ |
97 | sub r0, r0, r1 | |
98 | rsub r0, r0, r2 | |
77c93b2f G |
99 | copy_abort_end |
100 | .popsection | |
101 |