| /* SPDX-License-Identifier: GPL-2.0 */ |
| /* |
| * AArch32 user helpers. |
| * Based on the kuser helpers in arch/arm/kernel/entry-armv.S. |
| * |
| * Copyright (C) 2005-2011 Nicolas Pitre <nico@fluxnic.net> |
| * Copyright (C) 2012-2018 ARM Ltd. |
| * |
| * The kuser helpers below are mapped at a fixed address by |
| * aarch32_setup_additional_pages() and are provided for compatibility |
| * reasons with 32 bit (aarch32) applications that need them. |
| * |
| * See Documentation/arm/kernel_user_helpers.rst for formal definitions. |
| */ |
| |
| #include <asm/unistd.h> |
| |
| .align 5 |
| .globl __kuser_helper_start |
| __kuser_helper_start: |
| |
| __kuser_cmpxchg64: // 0xffff0f60 |
| .inst 0xe92d00f0 // push {r4, r5, r6, r7} |
| .inst 0xe1c040d0 // ldrd r4, r5, [r0] |
| .inst 0xe1c160d0 // ldrd r6, r7, [r1] |
| .inst 0xe1b20f9f // 1: ldrexd r0, r1, [r2] |
| .inst 0xe0303004 // eors r3, r0, r4 |
| .inst 0x00313005 // eoreqs r3, r1, r5 |
| .inst 0x01a23e96 // stlexdeq r3, r6, [r2] |
| .inst 0x03330001 // teqeq r3, #1 |
| .inst 0x0afffff9 // beq 1b |
| .inst 0xf57ff05b // dmb ish |
| .inst 0xe2730000 // rsbs r0, r3, #0 |
| .inst 0xe8bd00f0 // pop {r4, r5, r6, r7} |
| .inst 0xe12fff1e // bx lr |
| |
| .align 5 |
| __kuser_memory_barrier: // 0xffff0fa0 |
| .inst 0xf57ff05b // dmb ish |
| .inst 0xe12fff1e // bx lr |
| |
| .align 5 |
| __kuser_cmpxchg: // 0xffff0fc0 |
| .inst 0xe1923f9f // 1: ldrex r3, [r2] |
| .inst 0xe0533000 // subs r3, r3, r0 |
| .inst 0x01823e91 // stlexeq r3, r1, [r2] |
| .inst 0x03330001 // teqeq r3, #1 |
| .inst 0x0afffffa // beq 1b |
| .inst 0xf57ff05b // dmb ish |
| .inst 0xe2730000 // rsbs r0, r3, #0 |
| .inst 0xe12fff1e // bx lr |
| |
| .align 5 |
| __kuser_get_tls: // 0xffff0fe0 |
| .inst 0xee1d0f70 // mrc p15, 0, r0, c13, c0, 3 |
| .inst 0xe12fff1e // bx lr |
| .rep 5 |
| .word 0 |
| .endr |
| |
| __kuser_helper_version: // 0xffff0ffc |
| .word ((__kuser_helper_end - __kuser_helper_start) >> 5) |
| .globl __kuser_helper_end |
| __kuser_helper_end: |
