tools/testing/selftests/arm64/mte/mte_helper.S

Source file repositories/reference/linux-study-clean/tools/testing/selftests/arm64/mte/mte_helper.S

File Facts

System
Linux kernel
Corpus path
tools/testing/selftests/arm64/mte/mte_helper.S
Extension
.S
Size
2436 bytes
Lines
131
Domain
Support Tooling And Documentation
Bucket
tools
Inferred role
Support Tooling And Documentation: tools
Status
atlas-only

Why This File Exists

Repository support layer: documentation, build tooling, samples, user-space helper tools, generated initramfs support, licenses, and validation utilities.

Dependency Surface

Detected Declarations

Annotated Snippet

#include "mte_def.h"

.arch	armv8.5-a+memtag

#define ENTRY(name) \
	.globl name ;\
	.p2align 2;\
	.type name, @function ;\
name:

#define ENDPROC(name) \
	.size name, .-name ;

	.text
/*
 * mte_insert_random_tag: Insert random tag and might be same as the source tag if
 *			  the source pointer has it.
 * Input:
 *		x0 - source pointer with a tag/no-tag
 * Return:
 *		x0 - pointer with random tag
 */
ENTRY(mte_insert_random_tag)
	irg	x0, x0, xzr
	ret
ENDPROC(mte_insert_random_tag)

/*
 * mte_insert_new_tag: Insert new tag and different from the source tag if
 *		       source pointer has it.
 * Input:
 *		x0 - source pointer with a tag/no-tag
 * Return:
 *		x0 - pointer with random tag
 */
ENTRY(mte_insert_new_tag)
	gmi	x1, x0, xzr
	irg	x0, x0, x1
	ret
ENDPROC(mte_insert_new_tag)

/*
 * mte_get_tag_address: Get the tag from given address.
 * Input:
 *		x0 - source pointer
 * Return:
 *		x0 - pointer with appended tag
 */
ENTRY(mte_get_tag_address)
	ldg	x0, [x0]
	ret
ENDPROC(mte_get_tag_address)

/*
 * mte_set_tag_address_range: Set the tag range from the given address
 * Input:
 *		x0 - source pointer with tag data
 *		x1 - range
 * Return:
 *		none
 */
ENTRY(mte_set_tag_address_range)
	cbz	x1, 2f
1:
	stg	x0, [x0, #0x0]
	add	x0, x0, #MT_GRANULE_SIZE
	sub	x1, x1, #MT_GRANULE_SIZE
	cbnz	x1, 1b
2:
	ret

Annotation

Implementation Notes