Extend the ptrace test support for NT_ARM_TLS to cover TPIDR2_EL0 - on
systems that support SME the NT_ARM_TLS regset can be up to 2 elements
long with the second element containing TPIDR2_EL0. On systems
supporting SME we verify that this value can be read and written while
on systems that do not support SME we verify correct truncation of reads
and writes.
Signed-off-by: Mark Brown <broonie@xxxxxxxxxx>
---
tools/testing/selftests/arm64/abi/ptrace.c | 82 +++++++++++++++++++++-
1 file changed, 79 insertions(+), 3 deletions(-)
diff --git a/tools/testing/selftests/arm64/abi/ptrace.c b/tools/testing/selftests/arm64/abi/ptrace.c
index 4cc4d415b2e7..0a3d28a3972b 100644
--- a/tools/testing/selftests/arm64/abi/ptrace.c
+++ b/tools/testing/selftests/arm64/abi/ptrace.c
@@ -20,9 +20,9 @@
#include "../../kselftest.h"
-#define EXPECTED_TESTS 3
+#define EXPECTED_TESTS 7
-#define MAX_TPIDRS 1
+#define MAX_TPIDRS 2
static bool have_sme(void)
{
@@ -34,7 +34,8 @@ static void test_tpidr(pid_t child)
uint64_t read_val[MAX_TPIDRS];
uint64_t write_val[MAX_TPIDRS];
struct iovec read_iov, write_iov;
- int ret;
+ bool test_tpidr2 = false;
+ int ret, i;
read_iov.iov_base = read_val;
write_iov.iov_base = write_val;
@@ -54,6 +55,81 @@ static void test_tpidr(pid_t child)
ret = ptrace(PTRACE_GETREGSET, child, NT_ARM_TLS, &read_iov);
ksft_test_result(ret == 0 && write_val[0] == read_val[0],
"verify_tpidr_one\n");
+
+ /* If we have TPIDR2 we should be able to read it */
+ read_iov.iov_len = sizeof(read_val);
+ ret = ptrace(PTRACE_GETREGSET, child, NT_ARM_TLS, &read_iov);
+ if (ret == 0) {
+ /* If we have SME there should be two TPIDRs */
+ if (read_iov.iov_len >= sizeof(read_val))
+ test_tpidr2 = true;
+
+ if (have_sme() && test_tpidr2) {
+ ksft_test_result(test_tpidr2, "count_tpidrs\n");
+ } else {
+ ksft_test_result(read_iov.iov_len % sizeof(uint64_t) == 0,
+ "count_tpidrs\n");
+ }
+ } else {
+ ksft_test_result_fail("count_tpidrs\n");
+ }
+
+ if (test_tpidr2) {
+ /* Try to write new values to all known TPIDRs... */
+ write_iov.iov_len = sizeof(write_val);
+ for (i = 0; i < MAX_TPIDRS; i++)
+ write_val[i] = read_val[i] + 1;
+ ret = ptrace(PTRACE_SETREGSET, child, NT_ARM_TLS, &write_iov);
+
+ ksft_test_result(ret == 0 &&
+ write_iov.iov_len == sizeof(write_val),
+ "tpidr2_write\n");
+
+ /* ...then read them back */
+ read_iov.iov_len = sizeof(read_val);
+ ret = ptrace(PTRACE_GETREGSET, child, NT_ARM_TLS, &read_iov);
+
+ if (have_sme()) {
+ /* Should read back the written value */
+ ksft_test_result(ret == 0 &&
+ read_iov.iov_len >= sizeof(read_val) &&
+ memcmp(read_val, write_val,
+ sizeof(read_val)) == 0,
+ "tpidr2_read\n");
+ } else {
+ /* TPIDR2 should read as zero */
+ ksft_test_result(ret == 0 &&
+ read_iov.iov_len >= sizeof(read_val) &&
+ read_val[0] == write_val[0] &&
+ read_val[1] == 0,
+ "tpidr2_read\n");
+ }
+
+ /* Writing only TPIDR... */
+ write_iov.iov_len = sizeof(uint64_t);
+ memcpy(write_val, read_val, sizeof(read_val));
+ write_val[0] += 1;
+ ret = ptrace(PTRACE_SETREGSET, child, NT_ARM_TLS, &write_iov);
+
+ if (ret == 0) {
+ /* ...should leave TPIDR2 untouched */
+ read_iov.iov_len = sizeof(read_val);
+ ret = ptrace(PTRACE_GETREGSET, child, NT_ARM_TLS,
+ &read_iov);
+
+ ksft_test_result(ret == 0 &&
+ read_iov.iov_len >= sizeof(read_val) &&
+ memcmp(read_val, write_val,
+ sizeof(read_val)) == 0,
+ "write_tpidr_only\n");
+ } else {
+ ksft_test_result_fail("write_tpidr_only\n");
+ }
+ } else {
+ ksft_test_result_skip("tpidr2_write\n");
+ ksft_test_result_skip("tpidr2_read\n");
+ ksft_test_result_skip("write_tpidr_only\n");
+ }
}
static int do_child(void)
--
2.30.2
