mte_helper.S

  1/* SPDX-License-Identifier: GPL-2.0 */
  2/* Copyright (C) 2020 ARM Limited */
  3
  4#include "mte_def.h"
  5
  6.arch	armv8.5-a+memtag
  7
  8#define ENTRY(name) \
  9	.globl name ;\
 10	.p2align 2;\
 11	.type name, @function ;\
 12name:
 13
 14#define ENDPROC(name) \
 15	.size name, .-name ;
 16
 17	.text
 18/*
 19 * mte_insert_random_tag: Insert random tag and might be same as the source tag if
 20 *			  the source pointer has it.
 21 * Input:
 22 *		x0 - source pointer with a tag/no-tag
 23 * Return:
 24 *		x0 - pointer with random tag
 25 */
 26ENTRY(mte_insert_random_tag)
 27	irg	x0, x0, xzr
 28	ret
 29ENDPROC(mte_insert_random_tag)
 30
 31/*
 32 * mte_insert_new_tag: Insert new tag and different from the source tag if
 33 *		       source pointer has it.
 34 * Input:
 35 *		x0 - source pointer with a tag/no-tag
 36 * Return:
 37 *		x0 - pointer with random tag
 38 */
 39ENTRY(mte_insert_new_tag)
 40	gmi	x1, x0, xzr
 41	irg	x0, x0, x1
 42	ret
 43ENDPROC(mte_insert_new_tag)
 44
 45/*
 46 * mte_get_tag_address: Get the tag from given address.
 47 * Input:
 48 *		x0 - source pointer
 49 * Return:
 50 *		x0 - pointer with appended tag
 51 */
 52ENTRY(mte_get_tag_address)
 53	ldg	x0, [x0]
 54	ret
 55ENDPROC(mte_get_tag_address)
 56
 57/*
 58 * mte_set_tag_address_range: Set the tag range from the given address
 59 * Input:
 60 *		x0 - source pointer with tag data
 61 *		x1 - range
 62 * Return:
 63 *		none
 64 */
 65ENTRY(mte_set_tag_address_range)
 66	cbz	x1, 2f
 671:
 68	stg	x0, [x0, #0x0]
 69	add	x0, x0, #MT_GRANULE_SIZE
 70	sub	x1, x1, #MT_GRANULE_SIZE
 71	cbnz	x1, 1b
 722:
 73	ret
 74ENDPROC(mte_set_tag_address_range)
 75
 76/*
 77 * mt_clear_tag_address_range: Clear the tag range from the given address
 78 * Input:
 79 *		x0 - source pointer with tag data
 80 *		x1 - range
 81 * Return:
 82 *		none
 83 */
 84ENTRY(mte_clear_tag_address_range)
 85	cbz	x1, 2f
 861:
 87	stzg	x0, [x0, #0x0]
 88	add	x0, x0, #MT_GRANULE_SIZE
 89	sub	x1, x1, #MT_GRANULE_SIZE
 90	cbnz	x1, 1b
 912:
 92	ret
 93ENDPROC(mte_clear_tag_address_range)
 94
 95/*
 96 * mte_enable_pstate_tco: Enable PSTATE.TCO (tag check override) field
 97 * Input:
 98 *		none
 99 * Return:
100 *		none
101 */
102ENTRY(mte_enable_pstate_tco)
103	msr	tco, #MT_PSTATE_TCO_EN
104	ret
105ENDPROC(mte_enable_pstate_tco)
106
107/*
108 * mte_disable_pstate_tco: Disable PSTATE.TCO (tag check override) field
109 * Input:
110 *		none
111 * Return:
112 *		none
113 */
114ENTRY(mte_disable_pstate_tco)
115	msr	tco, #MT_PSTATE_TCO_DIS
116	ret
117ENDPROC(mte_disable_pstate_tco)
118
119/*
120 * mte_get_pstate_tco: Get PSTATE.TCO (tag check override) field
121 * Input:
122 *		none
123 * Return:
124 *		x0
125 */
126ENTRY(mte_get_pstate_tco)
127	mrs	x0, tco
128	ubfx	x0, x0, #MT_PSTATE_TCO_SHIFT, #1
129	ret
130ENDPROC(mte_get_pstate_tco)