Add linux-aarch64 taget.

armcap.c is shared between 32- and 64-bit builds and features link-time
detection of getauxval.

Submitted by: Ard Biesheuvel.

1 files changed, 62 insertions, 9 deletions

diff --git a/crypto/armcap.c b/crypto/armcap.c
index 550414425d..7e46d07a32 100644
--- a/crypto/armcap.c
+++ b/crypto/armcap.c
@@ -23,9 +23,9 @@ void _armv8_aes_probe(void);
 void _armv8_sha1_probe(void);
 void _armv8_sha256_probe(void);
 void _armv8_pmull_probe(void);
-unsigned int _armv7_tick(void);
+unsigned long _armv7_tick(void);
 
-unsigned int OPENSSL_rdtsc(void)
+unsigned long OPENSSL_rdtsc(void)
 	{
 	if (OPENSSL_armcap_P & ARMV7_TICK)
 		return _armv7_tick();
@@ -33,9 +33,41 @@ unsigned int OPENSSL_rdtsc(void)
 		return 0;
 	}
 
+/*
+ * Use a weak reference to getauxval() so we can use it if it is available but
+ * don't break the build if it is not.
+ */
 #if defined(__GNUC__) && __GNUC__>=2
 void OPENSSL_cpuid_setup(void) __attribute__((constructor));
+extern unsigned long getauxval(unsigned long type) __attribute__((weak));
+#else
+static unsigned long (*getauxval)(unsigned long) = NULL;
 #endif
+
+/*
+ * ARM puts the the feature bits for Crypto Extensions in AT_HWCAP2, whereas
+ * AArch64 used AT_HWCAP.
+ */
+#if defined(__arm__) || defined (__arm)
+# define HWCAP			16	/* AT_HWCAP */
+# define HWCAP_NEON		(1 << 12)
+
+# define HWCAP_CE		26	/* AT_HWCAP2 */
+# define HWCAP_CE_AES		(1 << 0)
+# define HWCAP_CE_PMULL		(1 << 1)
+# define HWCAP_CE_SHA1		(1 << 2)
+# define HWCAP_CE_SHA256	(1 << 3)
+#elif defined(__aarch64__)
+# define HWCAP			16	/* AT_HWCAP */
+# define HWCAP_NEON		(1 << 1)
+
+# define HWCAP_CE		HWCAP
+# define HWCAP_CE_AES		(1 << 3)
+# define HWCAP_CE_PMULL		(1 << 4)
+# define HWCAP_CE_SHA1		(1 << 5)
+# define HWCAP_CE_SHA256	(1 << 6)
+#endif
+
 void OPENSSL_cpuid_setup(void)
 	{
 	char *e;
@@ -48,7 +80,7 @@ void OPENSSL_cpuid_setup(void)
  
 	if ((e=getenv("OPENSSL_armcap")))
 		{
-		OPENSSL_armcap_P=strtoul(e,NULL,0);
+		OPENSSL_armcap_P=(unsigned int)strtoul(e,NULL,0);
 		return;
 		}
 
@@ -68,12 +100,38 @@ void OPENSSL_cpuid_setup(void)
 	sigprocmask(SIG_SETMASK,&ill_act.sa_mask,&oset);
 	sigaction(SIGILL,&ill_act,&ill_oact);
 
-	if (sigsetjmp(ill_jmp,1) == 0)
+	if (getauxval != NULL)
+		{
+		if (getauxval(HWCAP) & HWCAP_NEON)
+			{
+			unsigned long hwcap = getauxval(HWCAP_CE);
+
+			OPENSSL_armcap_P |= ARMV7_NEON;
+
+			if (hwcap & HWCAP_CE_AES)
+				OPENSSL_armcap_P |= ARMV8_AES;
+
+			if (hwcap & HWCAP_CE_PMULL)
+				OPENSSL_armcap_P |= ARMV8_PMULL;
+
+			if (hwcap & HWCAP_CE_SHA1)
+				OPENSSL_armcap_P |= ARMV8_SHA1;
+
+			if (hwcap & HWCAP_CE_SHA256)
+				OPENSSL_armcap_P |= ARMV8_SHA256;
+			}
+		}
+	else if (sigsetjmp(ill_jmp,1) == 0)
 		{
 		_armv7_neon_probe();
 		OPENSSL_armcap_P |= ARMV7_NEON;
 		if (sigsetjmp(ill_jmp,1) == 0)
 			{
+			_armv8_pmull_probe();
+			OPENSSL_armcap_P |= ARMV8_PMULL|ARMV8_AES;
+			}
+		else if (sigsetjmp(ill_jmp,1) == 0)
+			{
 			_armv8_aes_probe();
 			OPENSSL_armcap_P |= ARMV8_AES;
 			}
@@ -87,11 +145,6 @@ void OPENSSL_cpuid_setup(void)
 			_armv8_sha256_probe();
 			OPENSSL_armcap_P |= ARMV8_SHA256;
 			}
-		if (sigsetjmp(ill_jmp,1) == 0)
-			{
-			_armv8_pmull_probe();
-			OPENSSL_armcap_P |= ARMV8_PMULL;
-			}
 		}
 	if (sigsetjmp(ill_jmp,1) == 0)
 		{