1 files changed, 80 insertions, 0 deletions
diff --git a/crypto/armcap.c b/crypto/armcap.c
new file mode 100644
index 000000000000..5258d2fbddfa
--- /dev/null
+++ b/crypto/armcap.c
@@ -0,0 +1,80 @@
+#include <stdio.h>
+#include <stdlib.h>
+#include <string.h>
+#include <setjmp.h>
+#include <signal.h>
+#include <crypto.h>
+
+#include "arm_arch.h"
+
+unsigned int OPENSSL_armcap_P;
+
+static sigset_t all_masked;
+
+static sigjmp_buf ill_jmp;
+static void ill_handler (int sig) { siglongjmp(ill_jmp,sig); }
+
+/*
+ * Following subroutines could have been inlined, but it's not all
+ * ARM compilers support inline assembler...
+ */
+void _armv7_neon_probe(void);
+unsigned int _armv7_tick(void);
+
+unsigned int OPENSSL_rdtsc(void)
+	{
+	if (OPENSSL_armcap_P|ARMV7_TICK)
+		return _armv7_tick();
+	else
+		return 0;
+	}
+
+#if defined(__GNUC__) && __GNUC__>=2
+void OPENSSL_cpuid_setup(void) __attribute__((constructor));
+#endif
+void OPENSSL_cpuid_setup(void)
+	{
+	char *e;
+	struct sigaction	ill_oact,ill_act;
+	sigset_t		oset;
+	static int trigger=0;
+
+	if (trigger) return;
+	trigger=1;
+ 
+	if ((e=getenv("OPENSSL_armcap")))
+		{
+		OPENSSL_armcap_P=strtoul(e,NULL,0);
+		return;
+		}
+
+	sigfillset(&all_masked);
+	sigdelset(&all_masked,SIGILL);
+	sigdelset(&all_masked,SIGTRAP);
+	sigdelset(&all_masked,SIGFPE);
+	sigdelset(&all_masked,SIGBUS);
+	sigdelset(&all_masked,SIGSEGV);
+
+	OPENSSL_armcap_P = 0;
+
+	memset(&ill_act,0,sizeof(ill_act));
+	ill_act.sa_handler = ill_handler;
+	ill_act.sa_mask    = all_masked;
+
+	sigprocmask(SIG_SETMASK,&ill_act.sa_mask,&oset);
+	sigaction(SIGILL,&ill_act,&ill_oact);
+
+	if (sigsetjmp(ill_jmp,1) == 0)
+		{
+		_armv7_neon_probe();
+		OPENSSL_armcap_P |= ARMV7_NEON;
+		}
+	if (sigsetjmp(ill_jmp,1) == 0)
+		{
+		_armv7_tick();
+		OPENSSL_armcap_P |= ARMV7_TICK;
+		}
+
+	sigaction (SIGILL,&ill_oact,NULL);
+	sigprocmask(SIG_SETMASK,&oset,NULL);
+	}