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kselftest/arm64: add MOPS to hwcap test

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Add the MOPS hwcap to the hwcap kselftest and check that a SIGILL is not
generated when the feature is detected. A SIGILL is reliable when the
feature is not detected as SCTLR_EL1.MSCEn won't have been set.

Signed-off-by: Kristina Martsenko <kristina.martsenko@arm.com>
Reviewed-by: Mark Brown <broonie@kernel.org>
Link: https://lore.kernel.org/r/20230509142235.3284028-12-kristina.martsenko@arm.com
Signed-off-by: Catalin Marinas <catalin.marinas@arm.com>
This commit is contained in:
Kristina Martsenko 2023-05-09 15:22:35 +01:00 committed by Catalin Marinas
parent 3e1dedb29d
commit d8a324f102
1 changed files with 22 additions and 0 deletions
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22
tools/testing/selftests/arm64/abi/hwcap.c
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@ -39,6 +39,20 @@ static void cssc_sigill(void)
asm volatile(".inst 0xdac01c00" : : : "x0");
}
static void mops_sigill(void)
{
char dst[1], src[1];
register char *dstp asm ("x0") = dst;
register char *srcp asm ("x1") = src;
register long size asm ("x2") = 1;
/* CPYP [x0]!, [x1]!, x2! */
asm volatile(".inst 0x1d010440"
: "+r" (dstp), "+r" (srcp), "+r" (size)
:
: "cc", "memory");
}
static void rng_sigill(void)
{
asm volatile("mrs x0, S3_3_C2_C4_0" : : : "x0");
@ -209,6 +223,14 @@ static const struct hwcap_data {
.cpuinfo = "cssc",
.sigill_fn = cssc_sigill,
},
{
.name = "MOPS",
.at_hwcap = AT_HWCAP2,
.hwcap_bit = HWCAP2_MOPS,
.cpuinfo = "mops",
.sigill_fn = mops_sigill,
.sigill_reliable = true,
},
{
.name = "RNG",
.at_hwcap = AT_HWCAP2,