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Diffstat (limited to 'arch/arm64/kernel/kuser32.S')
| -rw-r--r-- | arch/arm64/kernel/kuser32.S | 65 |
1 files changed, 65 insertions, 0 deletions
diff --git a/arch/arm64/kernel/kuser32.S b/arch/arm64/kernel/kuser32.S new file mode 100644 index 000000000..af046ceac --- /dev/null +++ b/arch/arm64/kernel/kuser32.S @@ -0,0 +1,65 @@ +/* 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: |