1 files changed, 55 insertions, 0 deletions
diff --git a/libgo/go/runtime/msan.go b/libgo/go/runtime/msan.go
new file mode 100644
index 00000000000..4dbdf05b21c
--- /dev/null
+++ b/libgo/go/runtime/msan.go
@@ -0,0 +1,55 @@
+// Copyright 2015 The Go Authors.  All rights reserved.
+// Use of this source code is governed by a BSD-style
+// license that can be found in the LICENSE file.
+
+// +build msan
+
+package runtime
+
+import (
+	"unsafe"
+)
+
+// Public memory sanitizer API.
+
+func MSanRead(addr unsafe.Pointer, len int) {
+	msanread(addr, uintptr(len))
+}
+
+func MSanWrite(addr unsafe.Pointer, len int) {
+	msanwrite(addr, uintptr(len))
+}
+
+// Private interface for the runtime.
+const msanenabled = true
+
+// If we are running on the system stack, the C program may have
+// marked part of that stack as uninitialized.  We don't instrument
+// the runtime, but operations like a slice copy can call msanread
+// anyhow for values on the stack.  Just ignore msanread when running
+// on the system stack.  The other msan functions are fine.
+func msanread(addr unsafe.Pointer, sz uintptr) {
+	g := getg()
+	if g == g.m.g0 || g == g.m.gsignal {
+		return
+	}
+	domsanread(addr, sz)
+}
+
+//go:noescape
+func domsanread(addr unsafe.Pointer, sz uintptr)
+
+//go:noescape
+func msanwrite(addr unsafe.Pointer, sz uintptr)
+
+//go:noescape
+func msanmalloc(addr unsafe.Pointer, sz uintptr)
+
+//go:noescape
+func msanfree(addr unsafe.Pointer, sz uintptr)
+
+// These are called from msan_amd64.s
+//go:cgo_import_static __msan_read_go
+//go:cgo_import_static __msan_write_go
+//go:cgo_import_static __msan_malloc_go
+//go:cgo_import_static __msan_free_go