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torvalds
GitHub Repository: torvalds/linux
 Path: blob/master/tools/testing/selftests/arm64/bti/assembler.h
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/* SPDX-License-Identifier: GPL-2.0 */

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/*

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 * Copyright (C) 2019  Arm Limited

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 * Original author: Dave Martin <[email protected]>

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 */

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#ifndef ASSEMBLER_H

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#define ASSEMBLER_H

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#define NT_GNU_PROPERTY_TYPE_0	5

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#define GNU_PROPERTY_AARCH64_FEATURE_1_AND	0xc0000000

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/* Bits for GNU_PROPERTY_AARCH64_FEATURE_1_BTI */

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#define GNU_PROPERTY_AARCH64_FEATURE_1_BTI	(1U << 0)

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#define GNU_PROPERTY_AARCH64_FEATURE_1_PAC	(1U << 1)

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.macro startfn name:req

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	.globl \name

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\name:

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	.macro endfn

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		.size \name, . - \name

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		.type \name, @function

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		.purgem endfn

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	.endm

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.endm

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.macro emit_aarch64_feature_1_and

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	.pushsection .note.gnu.property, "a"

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	.align	3

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	.long	2f - 1f

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	.long	6f - 3f

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	.long	NT_GNU_PROPERTY_TYPE_0

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1:	.string	"GNU"

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2:

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	.align	3

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3:	.long	GNU_PROPERTY_AARCH64_FEATURE_1_AND

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	.long	5f - 4f

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4:

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#if BTI

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	.long	GNU_PROPERTY_AARCH64_FEATURE_1_PAC | \

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		GNU_PROPERTY_AARCH64_FEATURE_1_BTI

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#else

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	.long	0

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#endif

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5:

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	.align	3

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6:

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	.popsection

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.endm

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.macro paciasp

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	hint	0x19

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.endm

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.macro autiasp

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	hint	0x1d

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.endm

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.macro __bti_

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	hint	0x20

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.endm

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.macro __bti_c

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	hint	0x22

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.endm

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.macro __bti_j

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	hint	0x24

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.endm

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.macro __bti_jc

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	hint	0x26

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.endm

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.macro bti what=

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	__bti_\what

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.endm

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#endif /* ! ASSEMBLER_H */

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