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author | Daniel Baumann <daniel.baumann@progress-linux.org> | 2024-04-27 10:05:51 +0000 |
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committer | Daniel Baumann <daniel.baumann@progress-linux.org> | 2024-04-27 10:05:51 +0000 |
commit | 5d1646d90e1f2cceb9f0828f4b28318cd0ec7744 (patch) | |
tree | a94efe259b9009378be6d90eb30d2b019d95c194 /tools/testing/selftests/powerpc/math/fpu_denormal.c | |
parent | Initial commit. (diff) | |
download | linux-5d1646d90e1f2cceb9f0828f4b28318cd0ec7744.tar.xz linux-5d1646d90e1f2cceb9f0828f4b28318cd0ec7744.zip |
Adding upstream version 5.10.209.upstream/5.10.209upstream
Signed-off-by: Daniel Baumann <daniel.baumann@progress-linux.org>
Diffstat (limited to 'tools/testing/selftests/powerpc/math/fpu_denormal.c')
-rw-r--r-- | tools/testing/selftests/powerpc/math/fpu_denormal.c | 38 |
1 files changed, 38 insertions, 0 deletions
diff --git a/tools/testing/selftests/powerpc/math/fpu_denormal.c b/tools/testing/selftests/powerpc/math/fpu_denormal.c new file mode 100644 index 000000000..5f96682ab --- /dev/null +++ b/tools/testing/selftests/powerpc/math/fpu_denormal.c @@ -0,0 +1,38 @@ +// SPDX-License-Identifier: GPL-2.0-or-later +/* + * Copyright IBM Corp. 2020 + * + * This test attempts to cause a FP denormal exception on POWER8 CPUs. Unfortunately + * if the denormal handler is not configured or working properly, this can cause a bad + * crash in kernel mode when the kernel tries to save FP registers when the process + * exits. + */ + +#include <stdio.h> +#include <string.h> + +#include "utils.h" + +static int test_denormal_fpu(void) +{ + unsigned int m32; + unsigned long m64; + volatile float f; + volatile double d; + + /* try to induce lfs <denormal> ; stfd */ + + m32 = 0x00715fcf; /* random denormal */ + memcpy((float *)&f, &m32, sizeof(f)); + d = f; + memcpy(&m64, (double *)&d, sizeof(d)); + + FAIL_IF((long)(m64 != 0x380c57f3c0000000)); /* renormalised value */ + + return 0; +} + +int main(int argc, char *argv[]) +{ + return test_harness(test_denormal_fpu, "fpu_denormal"); +} |