From 74cd4e0e5399480e3fab2cd6a6cbdb17f673c335 Mon Sep 17 00:00:00 2001 From: Yifan Wu Date: Thu, 5 Mar 2026 09:36:38 +0800 Subject: [PATCH] selftests/arm64: Implement cmpbr_sigill() to hwcap test The function executes a CBEQ instruction which is valid if the CPU supports the CMPBR extension. The CBEQ branches to skip the following UDF instruction, and no SIGILL is generated. Otherwise, it will generate a SIGILL. Signed-off-by: Yifan Wu Reviewed-by: Mark Brown Signed-off-by: Catalin Marinas --- tools/testing/selftests/arm64/abi/hwcap.c | 3 ++- 1 file changed, 2 insertions(+), 1 deletion(-) diff --git a/tools/testing/selftests/arm64/abi/hwcap.c b/tools/testing/selftests/arm64/abi/hwcap.c index c2661a312fc98..e22703d6b97c2 100644 --- a/tools/testing/selftests/arm64/abi/hwcap.c +++ b/tools/testing/selftests/arm64/abi/hwcap.c @@ -56,7 +56,8 @@ static void atomics_sigill(void) static void cmpbr_sigill(void) { - /* Not implemented, too complicated and unreliable anyway */ + asm volatile(".inst 0x74C00040\n" /* CBEQ w0, w0, +8 */ + "udf #0" : : : "cc"); /* UDF #0 */ } static void crc32_sigill(void) -- 2.47.3