Commit 09b5febf authored by Mark Brown's avatar Mark Brown Committed by Will Deacon
Browse files

kselftest/arm64: Check that unsupported regsets fail in sve-ptrace 



Add a test which verifies that NT_ARM_SVE and NT_ARM_SSVE reads and writes
are rejected as expected when the relevant architecture feature is not
supported.

Signed-off-by: default avatarMark Brown <broonie@kernel.org>
Signed-off-by: default avatarWill Deacon <will@kernel.org>
parent dd68f51f

tools/testing/selftests/arm64/fp/sve-ptrace.c

+46 −0
Original line number Diff line number Diff line
@@ -174,6 +174,38 @@ static int set_sve(pid_t pid, const struct vec_type *type, 
	return ret;

}



/* A read operation fails */

static void read_fails(pid_t child, const struct vec_type *type)

{

	struct user_sve_header *new_sve = NULL;

	size_t new_sve_size = 0;

	void *ret;



	ret = get_sve(child, type, (void **)&new_sve, &new_sve_size);



	ksft_test_result(ret == NULL, "%s unsupported read fails\n",

			 type->name);



	free(new_sve);

}



/* A write operation fails */

static void write_fails(pid_t child, const struct vec_type *type)

{

	struct user_sve_header sve;

	int ret;



	/* Just the header, no data */

	memset(&sve, 0, sizeof(sve));

	sve.size = sizeof(sve);

	sve.flags = SVE_PT_REGS_SVE;

	sve.vl = SVE_VL_MIN;

	ret = set_sve(child, type, &sve);



	ksft_test_result(ret != 0, "%s unsupported write fails\n",

			 type->name);

}



/* Validate setting and getting the inherit flag */

static void ptrace_set_get_inherit(pid_t child, const struct vec_type *type)

{
@@ -718,6 +750,20 @@ static int do_parent(pid_t child) 
	}



	for (i = 0; i < ARRAY_SIZE(vec_types); i++) {

		/*

		 * If the vector type isn't supported reads and writes

		 * should fail.

		 */

		if (!(getauxval(vec_types[i].hwcap_type) & vec_types[i].hwcap)) {

			read_fails(child, &vec_types[i]);

			write_fails(child, &vec_types[i]);

		} else {

			ksft_test_result_skip("%s unsupported read fails\n",

					      vec_types[i].name);

			ksft_test_result_skip("%s unsupported write fails\n",

					      vec_types[i].name);

		}



		/* FPSIMD via SVE regset */

		if (getauxval(vec_types[i].hwcap_type) & vec_types[i].hwcap) {

			ptrace_sve_fpsimd(child, &vec_types[i]);