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/arm/kernel_user_helpers.txt for formal definitions. 14 */ 15 16#include <asm/unistd.h> 17 18 .align 5 19 .globl __kuser_helper_start 20__kuser_helper_start: 21 22__kuser_cmpxchg64: // 0xffff0f60 23 .inst 0xe92d00f0 // push {r4, r5, r6, r7} 24 .inst 0xe1c040d0 // ldrd r4, r5, [r0] 25 .inst 0xe1c160d0 // ldrd r6, r7, [r1] 26 .inst 0xe1b20f9f // 1: ldrexd r0, r1, [r2] 27 .inst 0xe0303004 // eors r3, r0, r4 28 .inst 0x00313005 // eoreqs r3, r1, r5 29 .inst 0x01a23e96 // stlexdeq r3, r6, [r2] 30 .inst 0x03330001 // teqeq r3, #1 31 .inst 0x0afffff9 // beq 1b 32 .inst 0xf57ff05b // dmb ish 33 .inst 0xe2730000 // rsbs r0, r3, #0 34 .inst 0xe8bd00f0 // pop {r4, r5, r6, r7} 35 .inst 0xe12fff1e // bx lr 36 37 .align 5 38__kuser_memory_barrier: // 0xffff0fa0 39 .inst 0xf57ff05b // dmb ish 40 .inst 0xe12fff1e // bx lr 41 42 .align 5 43__kuser_cmpxchg: // 0xffff0fc0 44 .inst 0xe1923f9f // 1: ldrex r3, [r2] 45 .inst 0xe0533000 // subs r3, r3, r0 46 .inst 0x01823e91 // stlexeq r3, r1, [r2] 47 .inst 0x03330001 // teqeq r3, #1 48 .inst 0x0afffffa // beq 1b 49 .inst 0xf57ff05b // dmb ish 50 .inst 0xe2730000 // rsbs r0, r3, #0 51 .inst 0xe12fff1e // bx lr 52 53 .align 5 54__kuser_get_tls: // 0xffff0fe0 55 .inst 0xee1d0f70 // mrc p15, 0, r0, c13, c0, 3 56 .inst 0xe12fff1e // bx lr 57 .rep 5 58 .word 0 59 .endr 60 61__kuser_helper_version: // 0xffff0ffc 62 .word ((__kuser_helper_end - __kuser_helper_start) >> 5) 63 .globl __kuser_helper_end 64__kuser_helper_end: 65