1 | /* SPDX-License-Identifier: GPL-2.0 */ |
2 | /* |
3 | * AArch32 user helpers. |
4 | * Based on the kuser helpers in arch/arm/kernel/entry-armv.S. |
5 | * |
6 | * Copyright (C) 2005-2011 Nicolas Pitre <nico@fluxnic.net> |
7 | * Copyright (C) 2012-2018 ARM Ltd. |
8 | * |
9 | * The kuser helpers below are mapped at a fixed address by |
10 | * aarch32_setup_additional_pages() and are provided for compatibility |
11 | * reasons with 32 bit (aarch32) applications that need them. |
12 | * |
13 | * See Documentation/arch/arm/kernel_user_helpers.rst for formal definitions. |
14 | */ |
15 | |
16 | #include <asm/unistd.h> |
17 | |
18 | .section .rodata |
19 | .align 5 |
20 | .globl __kuser_helper_start |
21 | __kuser_helper_start: |
22 | |
23 | __kuser_cmpxchg64: // 0xffff0f60 |
24 | .inst 0xe92d00f0 // push {r4, r5, r6, r7} |
25 | .inst 0xe1c040d0 // ldrd r4, r5, [r0] |
26 | .inst 0xe1c160d0 // ldrd r6, r7, [r1] |
27 | .inst 0xe1b20f9f // 1: ldrexd r0, r1, [r2] |
28 | .inst 0xe0303004 // eors r3, r0, r4 |
29 | .inst 0x00313005 // eoreqs r3, r1, r5 |
30 | .inst 0x01a23e96 // stlexdeq r3, r6, [r2] |
31 | .inst 0x03330001 // teqeq r3, #1 |
32 | .inst 0x0afffff9 // beq 1b |
33 | .inst 0xf57ff05b // dmb ish |
34 | .inst 0xe2730000 // rsbs r0, r3, #0 |
35 | .inst 0xe8bd00f0 // pop {r4, r5, r6, r7} |
36 | .inst 0xe12fff1e // bx lr |
37 | |
38 | .align 5 |
39 | __kuser_memory_barrier: // 0xffff0fa0 |
40 | .inst 0xf57ff05b // dmb ish |
41 | .inst 0xe12fff1e // bx lr |
42 | |
43 | .align 5 |
44 | __kuser_cmpxchg: // 0xffff0fc0 |
45 | .inst 0xe1923f9f // 1: ldrex r3, [r2] |
46 | .inst 0xe0533000 // subs r3, r3, r0 |
47 | .inst 0x01823e91 // stlexeq r3, r1, [r2] |
48 | .inst 0x03330001 // teqeq r3, #1 |
49 | .inst 0x0afffffa // beq 1b |
50 | .inst 0xf57ff05b // dmb ish |
51 | .inst 0xe2730000 // rsbs r0, r3, #0 |
52 | .inst 0xe12fff1e // bx lr |
53 | |
54 | .align 5 |
55 | __kuser_get_tls: // 0xffff0fe0 |
56 | .inst 0xee1d0f70 // mrc p15, 0, r0, c13, c0, 3 |
57 | .inst 0xe12fff1e // bx lr |
58 | .rep 5 |
59 | .word 0 |
60 | .endr |
61 | |
62 | __kuser_helper_version: // 0xffff0ffc |
63 | .word ((__kuser_helper_end - __kuser_helper_start) >> 5) |
64 | .globl __kuser_helper_end |
65 | __kuser_helper_end: |
66 | |