1 files changed, 32 insertions, 0 deletions
diff --git a/src/linux/alpha/get_scno.c b/src/linux/alpha/get_scno.c
new file mode 100644
index 000000000..7cb61fa18
--- /dev/null
+++ b/src/linux/alpha/get_scno.c
@@ -0,0 +1,32 @@
+/*
+ * Copyright (c) 2015-2019 The strace developers.
+ * All rights reserved.
+ *
+ * SPDX-License-Identifier: LGPL-2.1-or-later
+ */
+
+/* Return codes: 1 - ok, 0 - ignore, other - error. */
+static int
+arch_get_scno(struct tcb *tcp)
+{
+	kernel_ulong_t scno = 0;
+
+	if (upeek(tcp, REG_A3, &alpha_a3) < 0)
+		return -1;
+	if (upeek(tcp, REG_R0, &scno) < 0)
+		return -1;
+
+	/*
+	 * Do some sanity checks to figure out if it's
+	 * really a syscall entry
+	 */
+	if (!scno_in_range(scno)) {
+		if (alpha_a3 == 0 || alpha_a3 == -1UL) {
+			debug_msg("stray syscall exit: r0 = %lu", scno);
+			return 0;
+		}
+	}
+
+	tcp->scno = scno;
+	return 1;
+}