1 files changed, 110 insertions, 0 deletions
diff --git a/sys/arm64/include/csan.h b/sys/arm64/include/csan.h
new file mode 100644
index 000000000000..bace3866eb66
--- /dev/null
+++ b/sys/arm64/include/csan.h
@@ -0,0 +1,110 @@
+/*	$NetBSD: csan.h,v 1.2 2019/11/06 06:57:22 maxv Exp $	*/
+
+/*
+ * Copyright (c) 2019 The NetBSD Foundation, Inc.
+ * All rights reserved.
+ *
+ * This code is derived from software contributed to The NetBSD Foundation
+ * by Maxime Villard.
+ *
+ * Redistribution and use in source and binary forms, with or without
+ * modification, are permitted provided that the following conditions
+ * are met:
+ * 1. Redistributions of source code must retain the above copyright
+ *    notice, this list of conditions and the following disclaimer.
+ * 2. Redistributions in binary form must reproduce the above copyright
+ *    notice, this list of conditions and the following disclaimer in the
+ *    documentation and/or other materials provided with the distribution.
+ *
+ * THIS SOFTWARE IS PROVIDED BY THE NETBSD FOUNDATION, INC. AND CONTRIBUTORS
+ * ``AS IS'' AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED
+ * TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
+ * PURPOSE ARE DISCLAIMED.  IN NO EVENT SHALL THE FOUNDATION OR CONTRIBUTORS
+ * BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
+ * CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
+ * SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
+ * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
+ * CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
+ * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
+ * POSSIBILITY OF SUCH DAMAGE.
+ *
+ * $FreeBSD$
+ */
+
+#include <machine/cpufunc.h>
+#include <machine/stack.h>
+#include <machine/vmparam.h>
+
+static inline bool
+kcsan_md_unsupported(vm_offset_t addr)
+{
+	return false;
+}
+
+static inline bool
+kcsan_md_is_avail(void)
+{
+	return true;
+}
+
+static inline void
+kcsan_md_disable_intrs(uint64_t *state)
+{
+
+	*state = intr_disable();
+}
+
+static inline void
+kcsan_md_enable_intrs(uint64_t *state)
+{
+
+	intr_restore(*state);
+}
+
+static inline void
+kcsan_md_delay(uint64_t us)
+{
+	DELAY(us);
+}
+
+static void
+kcsan_md_unwind(void)
+{
+#ifdef DDB
+	c_db_sym_t sym;
+	db_expr_t offset;
+	const char *symname;
+#endif
+	struct unwind_state frame;
+	uint64_t sp;
+	int nsym;
+
+	__asm __volatile("mov %0, sp" : "=&r" (sp));
+
+	frame.sp = sp;
+	frame.fp = (uint64_t)__builtin_frame_address(0);
+	frame.pc = (uint64_t)kcsan_md_unwind;
+	nsym = 0;
+
+	while (1) {
+		unwind_frame(&frame);
+		if (!INKERNEL((vm_offset_t)frame.fp) ||
+		     !INKERNEL((vm_offset_t)frame.pc))
+			break;
+
+#ifdef DDB
+		sym = db_search_symbol((vm_offset_t)frame.pc, DB_STGY_PROC,
+		    &offset);
+		db_symbol_values(sym, &symname, NULL);
+		printf("#%d %p in %s+%#lx\n", nsym, (void *)frame.pc,
+		    symname, offset);
+#else
+		printf("#%d %p\n", nsym, (void *)frame.pc);
+#endif
+		nsym++;
+
+		if (nsym >= 15) {
+			break;
+		}
+	}
+}