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Message-Id: <20240801-arm64-gcs-v10-27-699e2bd2190b@kernel.org>
Date: Thu, 01 Aug 2024 13:06:54 +0100
From: Mark Brown <broonie@...nel.org>
To: Catalin Marinas <catalin.marinas@....com>,
Will Deacon <will@...nel.org>, Jonathan Corbet <corbet@....net>,
Andrew Morton <akpm@...ux-foundation.org>, Marc Zyngier <maz@...nel.org>,
Oliver Upton <oliver.upton@...ux.dev>, James Morse <james.morse@....com>,
Suzuki K Poulose <suzuki.poulose@....com>, Arnd Bergmann <arnd@...db.de>,
Oleg Nesterov <oleg@...hat.com>, Eric Biederman <ebiederm@...ssion.com>,
Shuah Khan <shuah@...nel.org>,
"Rick P. Edgecombe" <rick.p.edgecombe@...el.com>,
Deepak Gupta <debug@...osinc.com>, Ard Biesheuvel <ardb@...nel.org>,
Szabolcs Nagy <Szabolcs.Nagy@....com>, Kees Cook <kees@...nel.org>
Cc: "H.J. Lu" <hjl.tools@...il.com>,
Paul Walmsley <paul.walmsley@...ive.com>,
Palmer Dabbelt <palmer@...belt.com>, Albert Ou <aou@...s.berkeley.edu>,
Florian Weimer <fweimer@...hat.com>, Christian Brauner <brauner@...nel.org>,
Thiago Jung Bauermann <thiago.bauermann@...aro.org>,
Ross Burton <ross.burton@....com>, linux-arm-kernel@...ts.infradead.org,
linux-doc@...r.kernel.org, kvmarm@...ts.linux.dev,
linux-fsdevel@...r.kernel.org, linux-arch@...r.kernel.org,
linux-mm@...ck.org, linux-kselftest@...r.kernel.org,
linux-kernel@...r.kernel.org, linux-riscv@...ts.infradead.org,
Mark Brown <broonie@...nel.org>
Subject: [PATCH v10 27/40] kselftest/arm64: Verify the GCS hwcap
Add coverage of the GCS hwcap to the hwcap selftest, using a read of
GCSPR_EL0 to generate SIGILL without having to worry about enabling GCS.
Reviewed-by: Thiago Jung Bauermann <thiago.bauermann@...aro.org>
Signed-off-by: Mark Brown <broonie@...nel.org>
---
tools/testing/selftests/arm64/abi/hwcap.c | 19 +++++++++++++++++++
1 file changed, 19 insertions(+)
diff --git a/tools/testing/selftests/arm64/abi/hwcap.c b/tools/testing/selftests/arm64/abi/hwcap.c
index d8909b2b535a..dc54ae894fe5 100644
--- a/tools/testing/selftests/arm64/abi/hwcap.c
+++ b/tools/testing/selftests/arm64/abi/hwcap.c
@@ -98,6 +98,17 @@ static void fpmr_sigill(void)
asm volatile("mrs x0, S3_3_C4_C4_2" : : : "x0");
}
+static void gcs_sigill(void)
+{
+ unsigned long *gcspr;
+
+ asm volatile(
+ "mrs %0, S3_3_C2_C5_1"
+ : "=r" (gcspr)
+ :
+ : "cc");
+}
+
static void ilrcpc_sigill(void)
{
/* LDAPUR W0, [SP, #8] */
@@ -528,6 +539,14 @@ static const struct hwcap_data {
.sigill_fn = fpmr_sigill,
.sigill_reliable = true,
},
+ {
+ .name = "GCS",
+ .at_hwcap = AT_HWCAP2,
+ .hwcap_bit = HWCAP2_GCS,
+ .cpuinfo = "gcs",
+ .sigill_fn = gcs_sigill,
+ .sigill_reliable = true,
+ },
{
.name = "JSCVT",
.at_hwcap = AT_HWCAP,
--
2.39.2
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