tools/testing/selftests/arm64/mte/check_gcr_el1_cswitch.c

Source file repositories/reference/linux-study-clean/tools/testing/selftests/arm64/mte/check_gcr_el1_cswitch.c

File Facts

System
Linux kernel
Corpus path
tools/testing/selftests/arm64/mte/check_gcr_el1_cswitch.c
Extension
.c
Size
2657 bytes
Lines
144
Domain
Support Tooling And Documentation
Bucket
tools
Inferred role
Support Tooling And Documentation: implementation source
Status
source implementation candidate

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

if (prctl(PR_SET_TAGGED_ADDR_CTRL, prctl_set, 0, 0, 0)) {
			perror("prctl() failed");
			goto fail;
		}

		prctl_get = prctl(PR_GET_TAGGED_ADDR_CTRL, 0, 0, 0, 0);

		if (prctl_set != prctl_get) {
			ksft_print_msg("Error: prctl_set: 0x%lx != prctl_get: 0x%lx\n",
						prctl_set, prctl_get);
			goto fail;
		}
	}

	return (void *)KSFT_PASS;

fail:
	return (void *)KSFT_FAIL;
}

int execute_test(pid_t pid)
{
	pthread_t thread_id[MAX_THREADS];
	int thread_data[MAX_THREADS];

	for (int i = 0; i < MAX_THREADS; i++)
		pthread_create(&thread_id[i], NULL,
			       execute_thread, (void *)&pid);

	for (int i = 0; i < MAX_THREADS; i++)
		pthread_join(thread_id[i], (void *)&thread_data[i]);

	for (int i = 0; i < MAX_THREADS; i++)
		if (thread_data[i] == KSFT_FAIL)
			return KSFT_FAIL;

	return KSFT_PASS;
}

int mte_gcr_fork_test(void)
{
	pid_t pid;
	int results[NUM_ITERATIONS];
	pid_t cpid;
	int res;

	for (int i = 0; i < NUM_ITERATIONS; i++) {
		pid = fork();

		if (pid < 0)
			return KSFT_FAIL;

		if (pid == 0) {
			cpid = getpid();

			res = execute_test(cpid);

			exit(res);
		}
	}

	for (int i = 0; i < NUM_ITERATIONS; i++) {
		wait(&res);

		if (WIFEXITED(res))
			results[i] = WEXITSTATUS(res);
		else
			--i;
	}

	for (int i = 0; i < NUM_ITERATIONS; i++)
		if (results[i] == KSFT_FAIL)
			return KSFT_FAIL;

	return KSFT_PASS;
}

int main(int argc, char *argv[])
{
	int err;

	err = mte_default_setup();
	if (err)
		return err;

	ksft_set_plan(1);

	evaluate_test(mte_gcr_fork_test(),
		"Verify that GCR_EL1 is set correctly on context switch\n");

Annotation

Implementation Notes