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Diffstat (limited to 'arch/arm64/kernel/kuser32.S')
-rw-r--r-- | arch/arm64/kernel/kuser32.S | 77 |
1 files changed, 77 insertions, 0 deletions
diff --git a/arch/arm64/kernel/kuser32.S b/arch/arm64/kernel/kuser32.S new file mode 100644 index 00000000000..8b69ecb1d8b --- /dev/null +++ b/arch/arm64/kernel/kuser32.S | |||
@@ -0,0 +1,77 @@ | |||
1 | /* | ||
2 | * Low-level user helpers placed in the vectors page for AArch32. | ||
3 | * Based on the kuser helpers in arch/arm/kernel/entry-armv.S. | ||
4 | * | ||
5 | * Copyright (C) 2005-2011 Nicolas Pitre <nico@fluxnic.net> | ||
6 | * Copyright (C) 2012 ARM Ltd. | ||
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 | * This program is distributed in the hope that it will be useful, | ||
13 | * but WITHOUT ANY WARRANTY; without even the implied warranty of | ||
14 | * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the | ||
15 | * GNU General Public License for more details. | ||
16 | * | ||
17 | * You should have received a copy of the GNU General Public License | ||
18 | * along with this program. If not, see <http://www.gnu.org/licenses/>. | ||
19 | * | ||
20 | * | ||
21 | * AArch32 user helpers. | ||
22 | * | ||
23 | * Each segment is 32-byte aligned and will be moved to the top of the high | ||
24 | * vector page. New segments (if ever needed) must be added in front of | ||
25 | * existing ones. This mechanism should be used only for things that are | ||
26 | * really small and justified, and not be abused freely. | ||
27 | * | ||
28 | * See Documentation/arm/kernel_user_helpers.txt for formal definitions. | ||
29 | */ | ||
30 | .align 5 | ||
31 | .globl __kuser_helper_start | ||
32 | __kuser_helper_start: | ||
33 | |||
34 | __kuser_cmpxchg64: // 0xffff0f60 | ||
35 | .inst 0xe92d00f0 // push {r4, r5, r6, r7} | ||
36 | .inst 0xe1c040d0 // ldrd r4, r5, [r0] | ||
37 | .inst 0xe1c160d0 // ldrd r6, r7, [r1] | ||
38 | .inst 0xf57ff05f // dmb sy | ||
39 | .inst 0xe1b20f9f // 1: ldrexd r0, r1, [r2] | ||
40 | .inst 0xe0303004 // eors r3, r0, r4 | ||
41 | .inst 0x00313005 // eoreqs r3, r1, r5 | ||
42 | .inst 0x01a23f96 // strexdeq r3, r6, [r2] | ||
43 | .inst 0x03330001 // teqeq r3, #1 | ||
44 | .inst 0x0afffff9 // beq 1b | ||
45 | .inst 0xf57ff05f // dmb sy | ||
46 | .inst 0xe2730000 // rsbs r0, r3, #0 | ||
47 | .inst 0xe8bd00f0 // pop {r4, r5, r6, r7} | ||
48 | .inst 0xe12fff1e // bx lr | ||
49 | |||
50 | .align 5 | ||
51 | __kuser_memory_barrier: // 0xffff0fa0 | ||
52 | .inst 0xf57ff05f // dmb sy | ||
53 | .inst 0xe12fff1e // bx lr | ||
54 | |||
55 | .align 5 | ||
56 | __kuser_cmpxchg: // 0xffff0fc0 | ||
57 | .inst 0xf57ff05f // dmb sy | ||
58 | .inst 0xe1923f9f // 1: ldrex r3, [r2] | ||
59 | .inst 0xe0533000 // subs r3, r3, r0 | ||
60 | .inst 0x01823f91 // strexeq r3, r1, [r2] | ||
61 | .inst 0x03330001 // teqeq r3, #1 | ||
62 | .inst 0x0afffffa // beq 1b | ||
63 | .inst 0xe2730000 // rsbs r0, r3, #0 | ||
64 | .inst 0xeaffffef // b <__kuser_memory_barrier> | ||
65 | |||
66 | .align 5 | ||
67 | __kuser_get_tls: // 0xffff0fe0 | ||
68 | .inst 0xee1d0f70 // mrc p15, 0, r0, c13, c0, 3 | ||
69 | .inst 0xe12fff1e // bx lr | ||
70 | .rep 5 | ||
71 | .word 0 | ||
72 | .endr | ||
73 | |||
74 | __kuser_helper_version: // 0xffff0ffc | ||
75 | .word ((__kuser_helper_end - __kuser_helper_start) >> 5) | ||
76 | .globl __kuser_helper_end | ||
77 | __kuser_helper_end: | ||