2023-08-30 17:31:07 +02:00
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/* SPDX-License-Identifier: GPL-2.0 */
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/*
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* AArch32 user helpers.
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* Based on the kuser helpers in arch/arm/kernel/entry-armv.S.
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*
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* Copyright (C) 2005-2011 Nicolas Pitre <nico@fluxnic.net>
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* Copyright (C) 2012-2018 ARM Ltd.
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*
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* The kuser helpers below are mapped at a fixed address by
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* aarch32_setup_additional_pages() and are provided for compatibility
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* reasons with 32 bit (aarch32) applications that need them.
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*
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2023-10-24 12:59:35 +02:00
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* See Documentation/arch/arm/kernel_user_helpers.rst for formal definitions.
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2023-08-30 17:31:07 +02:00
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*/
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#include <asm/unistd.h>
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.section .rodata
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.align 5
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.globl __kuser_helper_start
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__kuser_helper_start:
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__kuser_cmpxchg64: // 0xffff0f60
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.inst 0xe92d00f0 // push {r4, r5, r6, r7}
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.inst 0xe1c040d0 // ldrd r4, r5, [r0]
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.inst 0xe1c160d0 // ldrd r6, r7, [r1]
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.inst 0xe1b20f9f // 1: ldrexd r0, r1, [r2]
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.inst 0xe0303004 // eors r3, r0, r4
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.inst 0x00313005 // eoreqs r3, r1, r5
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.inst 0x01a23e96 // stlexdeq r3, r6, [r2]
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.inst 0x03330001 // teqeq r3, #1
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.inst 0x0afffff9 // beq 1b
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.inst 0xf57ff05b // dmb ish
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.inst 0xe2730000 // rsbs r0, r3, #0
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.inst 0xe8bd00f0 // pop {r4, r5, r6, r7}
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.inst 0xe12fff1e // bx lr
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.align 5
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__kuser_memory_barrier: // 0xffff0fa0
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.inst 0xf57ff05b // dmb ish
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.inst 0xe12fff1e // bx lr
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.align 5
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__kuser_cmpxchg: // 0xffff0fc0
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.inst 0xe1923f9f // 1: ldrex r3, [r2]
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.inst 0xe0533000 // subs r3, r3, r0
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.inst 0x01823e91 // stlexeq r3, r1, [r2]
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.inst 0x03330001 // teqeq r3, #1
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.inst 0x0afffffa // beq 1b
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.inst 0xf57ff05b // dmb ish
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.inst 0xe2730000 // rsbs r0, r3, #0
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.inst 0xe12fff1e // bx lr
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.align 5
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__kuser_get_tls: // 0xffff0fe0
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.inst 0xee1d0f70 // mrc p15, 0, r0, c13, c0, 3
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.inst 0xe12fff1e // bx lr
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.rep 5
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.word 0
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.endr
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__kuser_helper_version: // 0xffff0ffc
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.word ((__kuser_helper_end - __kuser_helper_start) >> 5)
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.globl __kuser_helper_end
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__kuser_helper_end:
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