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torvalds
GitHub Repository: torvalds/linux
 Path: blob/master/tools/testing/selftests/arm64/mte/mte_helper.S
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/* SPDX-License-Identifier: GPL-2.0 */

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/* Copyright (C) 2020 ARM Limited */

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#include "mte_def.h"

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.arch	armv8.5-a+memtag

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#define ENTRY(name) \

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	.globl name ;\

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	.p2align 2;\

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	.type name, @function ;\

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name:

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#define ENDPROC(name) \

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	.size name, .-name ;

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	.text

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/*

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 * mte_insert_random_tag: Insert random tag and might be same as the source tag if

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 *			  the source pointer has it.

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 * Input:

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 *		x0 - source pointer with a tag/no-tag

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 * Return:

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 *		x0 - pointer with random tag

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 */

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ENTRY(mte_insert_random_tag)

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	irg	x0, x0, xzr

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	ret

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ENDPROC(mte_insert_random_tag)

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/*

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 * mte_insert_new_tag: Insert new tag and different from the source tag if

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 *		       source pointer has it.

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 * Input:

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 *		x0 - source pointer with a tag/no-tag

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 * Return:

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 *		x0 - pointer with random tag

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 */

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ENTRY(mte_insert_new_tag)

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	gmi	x1, x0, xzr

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	irg	x0, x0, x1

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	ret

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ENDPROC(mte_insert_new_tag)

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/*

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 * mte_get_tag_address: Get the tag from given address.

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 * Input:

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 *		x0 - source pointer

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 * Return:

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 *		x0 - pointer with appended tag

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 */

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ENTRY(mte_get_tag_address)

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	ldg	x0, [x0]

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	ret

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ENDPROC(mte_get_tag_address)

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/*

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 * mte_set_tag_address_range: Set the tag range from the given address

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 * Input:

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 *		x0 - source pointer with tag data

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 *		x1 - range

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 * Return:

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 *		none

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 */

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ENTRY(mte_set_tag_address_range)

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	cbz	x1, 2f

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1:

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	stg	x0, [x0, #0x0]

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	add	x0, x0, #MT_GRANULE_SIZE

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	sub	x1, x1, #MT_GRANULE_SIZE

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	cbnz	x1, 1b

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2:

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	ret

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ENDPROC(mte_set_tag_address_range)

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/*

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 * mt_clear_tag_address_range: Clear the tag range from the given address

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 * Input:

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 *		x0 - source pointer with tag data

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 *		x1 - range

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 * Return:

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 *		none

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 */

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ENTRY(mte_clear_tag_address_range)

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	cbz	x1, 2f

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1:

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	stzg	x0, [x0, #0x0]

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	add	x0, x0, #MT_GRANULE_SIZE

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	sub	x1, x1, #MT_GRANULE_SIZE

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	cbnz	x1, 1b

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2:

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	ret

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ENDPROC(mte_clear_tag_address_range)

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/*

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 * mte_enable_pstate_tco: Enable PSTATE.TCO (tag check override) field

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 * Input:

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 *		none

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 * Return:

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 *		none

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 */

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ENTRY(mte_enable_pstate_tco)

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	msr	tco, #MT_PSTATE_TCO_EN

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	ret

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ENDPROC(mte_enable_pstate_tco)

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/*

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 * mte_disable_pstate_tco: Disable PSTATE.TCO (tag check override) field

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 * Input:

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 *		none

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 * Return:

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 *		none

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 */

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ENTRY(mte_disable_pstate_tco)

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	msr	tco, #MT_PSTATE_TCO_DIS

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	ret

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ENDPROC(mte_disable_pstate_tco)

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/*

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 * mte_get_pstate_tco: Get PSTATE.TCO (tag check override) field

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 * Input:

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 *		none

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 * Return:

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 *		x0

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 */

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ENTRY(mte_get_pstate_tco)

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	mrs	x0, tco

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	ubfx	x0, x0, #MT_PSTATE_TCO_SHIFT, #1

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	ret

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ENDPROC(mte_get_pstate_tco)

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