arm64: advertise ARMv8 extensions to 32-bit compat ELF binaries

This adds support for advertising the presence of ARMv8 Crypto
Extensions in the Aarch32 execution state to 32-bit ELF binaries
running in 32-bit compat mode under the arm64 kernel.

Signed-off-by: Ard Biesheuvel <ard.biesheuvel@linaro.org>
Signed-off-by: Catalin Marinas <catalin.marinas@arm.com>

1 files changed, 6 insertions, 0 deletions

diff --git a/arch/arm64/include/asm/hwcap.h b/arch/arm64/include/asm/hwcap.h
index 9a4cbd60c88e..024c46183c3c 100644
--- a/arch/arm64/include/asm/hwcap.h
+++ b/arch/arm64/include/asm/hwcap.h
@@ -32,6 +32,12 @@
 #define COMPAT_HWCAP_IDIV       (COMPAT_HWCAP_IDIVA|COMPAT_HWCAP_IDIVT)
 #define COMPAT_HWCAP_EVTSTRM    (1 << 21)
 
+#define COMPAT_HWCAP2_AES       (1 << 0)
+#define COMPAT_HWCAP2_PMULL     (1 << 1)
+#define COMPAT_HWCAP2_SHA1      (1 << 2)
+#define COMPAT_HWCAP2_SHA2      (1 << 3)
+#define COMPAT_HWCAP2_CRC32     (1 << 4)
+
 #ifndef __ASSEMBLY__
 /*
  * This yields a mask that user programs can use to figure out what