[PATCH v4 36/36] kselftest/arm64: Enable GCS for the FP stress tests

Mark Brown
2023-08-07T22:06:15Z

While it's a bit off topic for them the floating point stress tests do give
us some coverage of context thrashing cases, and also of active signal
delivery separate to the relatively complicated framework in the actual
signals tests. Have the tests enable GCS on startup, ignoring failures so
they continue to work as before on systems without GCS.

Signed-off-by: Mark Brown <broonie@kernel.org>
---
tools/testing/selftests/arm64/fp/assembler.h | 15 +++++++++++++++
tools/testing/selftests/arm64/fp/fpsimd-test.S | 2 ++
tools/testing/selftests/arm64/fp/sve-test.S | 2 ++
tools/testing/selftests/arm64/fp/za-test.S | 2 ++
tools/testing/selftests/arm64/fp/zt-test.S | 2 ++
5 files changed, 23 insertions(+)

diff --git a/tools/testing/selftests/arm64/fp/assembler.h b/tools/testing/selftests/arm64/fp/assembler.h
index 9b38a0da407d..7012f9f796de 100644
--- a/tools/testing/selftests/arm64/fp/assembler.h
+++ b/tools/testing/selftests/arm64/fp/assembler.h
@@ -65,4 +65,19 @@ endfunction
bl puts
.endm

+#define PR_SET_SHADOW_STACK_STATUS 72
+# define PR_SHADOW_STACK_ENABLE (1UL << 0)
+
+.macro enable_gcs
+ // Run with GCS
+ mov x0, PR_SET_SHADOW_STACK_STATUS
+ mov x1, PR_SHADOW_STACK_ENABLE
+ mov x2, xzr
+ mov x3, xzr
+ mov x4, xzr
+ mov x5, xzr
+ mov x8, #__NR_prctl
+ svc #0
+.endm
+
#endif /* ! ASSEMBLER_H */
diff --git a/tools/testing/selftests/arm64/fp/fpsimd-test.S b/tools/testing/selftests/arm64/fp/fpsimd-test.S
index 8b960d01ed2e..b16fb7f42e3e 100644
--- a/tools/testing/selftests/arm64/fp/fpsimd-test.S
+++ b/tools/testing/selftests/arm64/fp/fpsimd-test.S
@@ -215,6 +215,8 @@ endfunction
// Main program entry point
.globl _start
function _start
+ enable_gcs
+
mov x23, #0 // signal count

mov w0, #SIGINT
diff --git a/tools/testing/selftests/arm64/fp/sve-test.S b/tools/testing/selftests/arm64/fp/sve-test.S
index 4328895dfc87..486634bc7def 100644
--- a/tools/testing/selftests/arm64/fp/sve-test.S
+++ b/tools/testing/selftests/arm64/fp/sve-test.S
@@ -378,6 +378,8 @@ endfunction
// Main program entry point
.globl _start
function _start
+ enable_gcs
+
mov x23, #0 // Irritation signal count

mov w0, #SIGINT
diff --git a/tools/testing/selftests/arm64/fp/za-test.S b/tools/testing/selftests/arm64/fp/za-test.S
index 9dcd70911397..f789694fa3ea 100644
--- a/tools/testing/selftests/arm64/fp/za-test.S
+++ b/tools/testing/selftests/arm64/fp/za-test.S
@@ -231,6 +231,8 @@ endfunction
// Main program entry point
.globl _start
function _start
+ enable_gcs
+
mov x23, #0 // signal count

mov w0, #SIGINT
diff --git a/tools/testing/selftests/arm64/fp/zt-test.S b/tools/testing/selftests/arm64/fp/zt-test.S
index d63286397638..ea5e55310705 100644
--- a/tools/testing/selftests/arm64/fp/zt-test.S
+++ b/tools/testing/selftests/arm64/fp/zt-test.S
@@ -200,6 +200,8 @@ endfunction
// Main program entry point
.globl _start
function _start
+ enable_gcs
+
mov x23, #0 // signal count

mov w0, #SIGINT

--
2.30.2