Adding upstream version 1.21.8.upstream/1.21.8

Signed-off-by: Daniel Baumann <daniel.baumann@progress-linux.org>

1 files changed, 62 insertions, 0 deletions

diff --git a/src/runtime/msan.go b/src/runtime/msan.go
new file mode 100644
index 0000000..5e2aae1
--- /dev/null
+++ b/src/runtime/msan.go
@@ -0,0 +1,62 @@
+// 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.
+
+//go: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.
+//
+//go:nosplit
+func msanread(addr unsafe.Pointer, sz uintptr) {
+	gp := getg()
+	if gp == nil || gp.m == nil || gp == gp.m.g0 || gp == gp.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)
+
+//go:noescape
+func msanmove(dst, src unsafe.Pointer, sz uintptr)
+
+// These are called from msan_GOARCH.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
+//go:cgo_import_static __msan_memmove