add linkname to runtime funcs, fix package docs

Author: mauri870

src/internal/msan/doc.go

@@ -1,12 +1,9 @@
-// Copyright 2023 The Go Authors. All rights reserved.
+// Copyright 2024 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.
 
-/*
-Package msan contains helper functions for manually instrumenting code
-for the memory sanitizer.
-
-This package exports the private msan routines in runtime unconditionally
-but without the "msan" build tag they are no-ops.
-*/
+// Package msan contains helper functions for manually instrumenting code
+// for the memory sanitizer.
+// This package exports the private msan routines in runtime unconditionally
+// but without the "msan" build tag they are no-ops.
 package msan

src/internal/msan/msan.go

@@ -1,4 +1,4 @@
-// Copyright 2023 The Go Authors. All rights reserved.
+// Copyright 2024 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.
 

src/runtime/msan.go

@@ -29,6 +29,7 @@ const msanenabled = true
 // anyhow for values on the stack. Just ignore msanread when running
 // on the system stack. The other msan functions are fine.
 //
+//go:linkname msanread
 //go:nosplit
 func msanread(addr unsafe.Pointer, sz uintptr) {
 	gp := getg()
@@ -41,15 +42,19 @@ func msanread(addr unsafe.Pointer, sz uintptr) {
 //go:noescape
 func domsanread(addr unsafe.Pointer, sz uintptr)
 
+//go:linkname msanwrite
 //go:noescape
 func msanwrite(addr unsafe.Pointer, sz uintptr)
 
+//go:linkname msanmalloc
 //go:noescape
 func msanmalloc(addr unsafe.Pointer, sz uintptr)
 
+//go:linkname msanfree
 //go:noescape
 func msanfree(addr unsafe.Pointer, sz uintptr)
 
+//go:linkname msanmove
 //go:noescape
 func msanmove(dst, src unsafe.Pointer, sz uintptr)