projects / GitHub / mt8127 / android_kernel_alcatel_ttab.git / blame
| Commit | Line | Data |
|---|---|---|
| 3dd681d9 WD |
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 | */ | |
| 6fa3eb70 S |
30 | |
| 31 | #include <asm/unistd.h> | |
| 32 | ||
| 3dd681d9 WD |
33 | .align 5 |
| 34 | .globl __kuser_helper_start | |
| 35 | __kuser_helper_start: | |
| 36 | ||
| 37 | __kuser_cmpxchg64: // 0xffff0f60 | |
| 38 | .inst 0xe92d00f0 // push {r4, r5, r6, r7} | |
| 39 | .inst 0xe1c040d0 // ldrd r4, r5, [r0] | |
| 40 | .inst 0xe1c160d0 // ldrd r6, r7, [r1] | |
| 41 | .inst 0xf57ff05f // dmb sy | |
| 42 | .inst 0xe1b20f9f // 1: ldrexd r0, r1, [r2] | |
| 43 | .inst 0xe0303004 // eors r3, r0, r4 | |
| 44 | .inst 0x00313005 // eoreqs r3, r1, r5 | |
| 45 | .inst 0x01a23f96 // strexdeq r3, r6, [r2] | |
| 46 | .inst 0x03330001 // teqeq r3, #1 | |
| 47 | .inst 0x0afffff9 // beq 1b | |
| 48 | .inst 0xf57ff05f // dmb sy | |
| 49 | .inst 0xe2730000 // rsbs r0, r3, #0 | |
| 50 | .inst 0xe8bd00f0 // pop {r4, r5, r6, r7} | |
| 51 | .inst 0xe12fff1e // bx lr | |
| 52 | ||
| 53 | .align 5 | |
| 54 | __kuser_memory_barrier: // 0xffff0fa0 | |
| 55 | .inst 0xf57ff05f // dmb sy | |
| 56 | .inst 0xe12fff1e // bx lr | |
| 57 | ||
| 58 | .align 5 | |
| 59 | __kuser_cmpxchg: // 0xffff0fc0 | |
| 60 | .inst 0xf57ff05f // dmb sy | |
| 61 | .inst 0xe1923f9f // 1: ldrex r3, [r2] | |
| 62 | .inst 0xe0533000 // subs r3, r3, r0 | |
| 63 | .inst 0x01823f91 // strexeq r3, r1, [r2] | |
| 64 | .inst 0x03330001 // teqeq r3, #1 | |
| 65 | .inst 0x0afffffa // beq 1b | |
| 66 | .inst 0xe2730000 // rsbs r0, r3, #0 | |
| 67 | .inst 0xeaffffef // b <__kuser_memory_barrier> | |
| 68 | ||
| 69 | .align 5 | |
| 70 | __kuser_get_tls: // 0xffff0fe0 | |
| 71 | .inst 0xee1d0f70 // mrc p15, 0, r0, c13, c0, 3 | |
| 72 | .inst 0xe12fff1e // bx lr | |
| 73 | .rep 5 | |
| 74 | .word 0 | |
| 75 | .endr | |
| 76 | ||
| 77 | __kuser_helper_version: // 0xffff0ffc | |
| 78 | .word ((__kuser_helper_end - __kuser_helper_start) >> 5) | |
| 79 | .globl __kuser_helper_end | |
| 80 | __kuser_helper_end: |