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    Subject[PATCH v2 35/35] kselftest/arm64: Enable GCS for the FP stress tests
    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

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