diff --git a/src/syscall/asan.go b/src/syscall/asan.go
deleted file mode 100644
index eff30781e4..0000000000
--- a/src/syscall/asan.go
+++ /dev/null
@@ -1,22 +0,0 @@
-// Copyright 2021 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 asan
-
-package syscall
-
-import (
-	"runtime"
-	"unsafe"
-)
-
-const asanenabled = true
-
-func asanRead(addr unsafe.Pointer, len int) {
-	runtime.ASanRead(addr, len)
-}
-
-func asanWrite(addr unsafe.Pointer, len int) {
-	runtime.ASanWrite(addr, len)
-}
diff --git a/src/syscall/asan0.go b/src/syscall/asan0.go
deleted file mode 100644
index 08bc44dea1..0000000000
--- a/src/syscall/asan0.go
+++ /dev/null
@@ -1,19 +0,0 @@
-// Copyright 2021 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 !asan
-
-package syscall
-
-import (
-	"unsafe"
-)
-
-const asanenabled = false
-
-func asanRead(addr unsafe.Pointer, len int) {
-}
-
-func asanWrite(addr unsafe.Pointer, len int) {
-}
diff --git a/src/syscall/msan.go b/src/syscall/msan.go
deleted file mode 100644
index 89c580799f..0000000000
--- a/src/syscall/msan.go
+++ /dev/null
@@ -1,22 +0,0 @@
-// 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 syscall
-
-import (
-	"runtime"
-	"unsafe"
-)
-
-const msanenabled = true
-
-func msanRead(addr unsafe.Pointer, len int) {
-	runtime.MSanRead(addr, len)
-}
-
-func msanWrite(addr unsafe.Pointer, len int) {
-	runtime.MSanWrite(addr, len)
-}
diff --git a/src/syscall/msan0.go b/src/syscall/msan0.go
deleted file mode 100644
index fba8a5f716..0000000000
--- a/src/syscall/msan0.go
+++ /dev/null
@@ -1,19 +0,0 @@
-// 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 syscall
-
-import (
-	"unsafe"
-)
-
-const msanenabled = false
-
-func msanRead(addr unsafe.Pointer, len int) {
-}
-
-func msanWrite(addr unsafe.Pointer, len int) {
-}
diff --git a/src/syscall/syscall_unix.go b/src/syscall/syscall_unix.go
index 0d3fe31e7a..79aac51c8f 100644
--- a/src/syscall/syscall_unix.go
+++ b/src/syscall/syscall_unix.go
@@ -8,8 +8,10 @@ package syscall
 
 import (
 	errorspkg "errors"
+	"internal/asan"
 	"internal/bytealg"
 	"internal/itoa"
+	"internal/msan"
 	"internal/oserror"
 	"internal/race"
 	"runtime"
@@ -187,11 +189,11 @@ func Read(fd int, p []byte) (n int, err error) {
 			race.Acquire(unsafe.Pointer(&ioSync))
 		}
 	}
-	if msanenabled && n > 0 {
-		msanWrite(unsafe.Pointer(&p[0]), n)
+	if msan.Enabled && n > 0 {
+		msan.Write(unsafe.Pointer(&p[0]), uintptr(n))
 	}
-	if asanenabled && n > 0 {
-		asanWrite(unsafe.Pointer(&p[0]), n)
+	if asan.Enabled && n > 0 {
+		asan.Write(unsafe.Pointer(&p[0]), n)
 	}
 	return
 }
@@ -211,11 +213,11 @@ func Write(fd int, p []byte) (n int, err error) {
 	if race.Enabled && n > 0 {
 		race.ReadRange(unsafe.Pointer(&p[0]), n)
 	}
-	if msanenabled && n > 0 {
-		msanRead(unsafe.Pointer(&p[0]), n)
+	if msan.Enabled && n > 0 {
+		msan.Read(unsafe.Pointer(&p[0]), uintptr(n))
 	}
-	if asanenabled && n > 0 {
-		asanRead(unsafe.Pointer(&p[0]), n)
+	if asan.Enabled && n > 0 {
+		asan.Read(unsafe.Pointer(&p[0]), n)
 	}
 	return
 }
@@ -230,11 +232,11 @@ func Pread(fd int, p []byte, offset int64) (n int, err error) {
 			race.Acquire(unsafe.Pointer(&ioSync))
 		}
 	}
-	if msanenabled && n > 0 {
-		msanWrite(unsafe.Pointer(&p[0]), n)
+	if msan.Enabled && n > 0 {
+		msan.Write(unsafe.Pointer(&p[0]), uintptr(n))
 	}
-	if asanenabled && n > 0 {
-		asanWrite(unsafe.Pointer(&p[0]), n)
+	if asan.Enabled && n > 0 {
+		asan.Write(unsafe.Pointer(&p[0]), n)
 	}
 	return
 }
@@ -247,11 +249,11 @@ func Pwrite(fd int, p []byte, offset int64) (n int, err error) {
 	if race.Enabled && n > 0 {
 		race.ReadRange(unsafe.Pointer(&p[0]), n)
 	}
-	if msanenabled && n > 0 {
-		msanRead(unsafe.Pointer(&p[0]), n)
+	if msan.Enabled && n > 0 {
+		msan.Read(unsafe.Pointer(&p[0]), uintptr(n))
 	}
-	if asanenabled && n > 0 {
-		asanRead(unsafe.Pointer(&p[0]), n)
+	if asan.Enabled && n > 0 {
+		asan.Read(unsafe.Pointer(&p[0]), n)
 	}
 	return
 }
diff --git a/src/syscall/syscall_windows.go b/src/syscall/syscall_windows.go
index bfd0d50fa7..032f814304 100644
--- a/src/syscall/syscall_windows.go
+++ b/src/syscall/syscall_windows.go
@@ -8,8 +8,10 @@ package syscall
 
 import (
 	errorspkg "errors"
+	"internal/asan"
 	"internal/bytealg"
 	"internal/itoa"
+	"internal/msan"
 	"internal/oserror"
 	"internal/race"
 	"runtime"
@@ -446,11 +448,11 @@ func ReadFile(fd Handle, p []byte, done *uint32, overlapped *Overlapped) error {
 		}
 		race.Acquire(unsafe.Pointer(&ioSync))
 	}
-	if msanenabled && *done > 0 {
-		msanWrite(unsafe.Pointer(&p[0]), int(*done))
+	if msan.Enabled && *done > 0 {
+		msan.Write(unsafe.Pointer(&p[0]), uintptr(*done))
 	}
-	if asanenabled && *done > 0 {
-		asanWrite(unsafe.Pointer(&p[0]), int(*done))
+	if asan.Enabled && *done > 0 {
+		asan.Write(unsafe.Pointer(&p[0]), int(*done))
 	}
 	return err
 }
@@ -463,11 +465,11 @@ func WriteFile(fd Handle, p []byte, done *uint32, overlapped *Overlapped) error
 	if race.Enabled && *done > 0 {
 		race.ReadRange(unsafe.Pointer(&p[0]), int(*done))
 	}
-	if msanenabled && *done > 0 {
-		msanRead(unsafe.Pointer(&p[0]), int(*done))
+	if msan.Enabled && *done > 0 {
+		msan.Read(unsafe.Pointer(&p[0]), uintptr(*done))
 	}
-	if asanenabled && *done > 0 {
-		asanRead(unsafe.Pointer(&p[0]), int(*done))
+	if asan.Enabled && *done > 0 {
+		asan.Read(unsafe.Pointer(&p[0]), int(*done))
 	}
 	return err
 }