/* 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/arch/arm/kernel_user_helpers.rst for formal definitions. */ #include <asm/unistd.h> .section .rodata .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:
