s390x assembler update: add support for run-time facility detection.

1 files changed, 37 insertions, 0 deletions

diff --git a/crypto/s390xcap.c b/crypto/s390xcap.c
new file mode 100644
index 0000000000..ffbe0235f9
--- /dev/null
+++ b/crypto/s390xcap.c
@@ -0,0 +1,37 @@
+#include <stdio.h>
+#include <stdlib.h>
+#include <string.h>
+#include <setjmp.h>
+#include <signal.h>
+
+extern unsigned long OPENSSL_s390xcap_P;
+
+static sigjmp_buf ill_jmp;
+static void ill_handler (int sig) { siglongjmp(ill_jmp,sig); }
+
+unsigned long OPENSSL_s390x_facilities(void);
+
+void OPENSSL_cpuid_setup(void)
+	{
+	sigset_t oset;
+	struct sigaction ill_act,oact;
+
+	if (OPENSSL_s390xcap_P) return;
+
+	memset(&ill_act,0,sizeof(ill_act));
+	ill_act.sa_handler = ill_handler;
+	sigfillset(&ill_act.sa_mask);
+	sigdelset(&ill_act.sa_mask,SIGILL);
+	sigdelset(&ill_act.sa_mask,SIGTRAP);
+	sigprocmask(SIG_SETMASK,&ill_act.sa_mask,&oset);
+	sigaction (SIGILL,&ill_act,&oact);
+
+	/* protection against missing store-facility-list-extended */
+	if (sigsetjmp(ill_jmp,0) == 0)
+		OPENSSL_s390xcap_P = OPENSSL_s390x_facilities();
+	else
+		OPENSSL_s390xcap_P = 1UL<<63;
+
+	sigaction (SIGILL,&oact,NULL);
+	sigprocmask(SIG_SETMASK,&oset,NULL);
+	}