8 files changed, 79 insertions, 3 deletions
diff --git a/src/runtime/coro.go b/src/runtime/coro.go
index 98e789f133..b2bc801940 100644
--- a/src/runtime/coro.go
+++ b/src/runtime/coro.go
@@ -46,8 +46,6 @@ func newcoro(f func(*coro)) *coro {
 	return c
 }
 
-//go:linkname corostart
-
 // corostart is the entry func for a new coroutine.
 // It runs the coroutine user function f passed to corostart
 // and then calls coroexit to remove the extra concurrency.
diff --git a/src/runtime/coverage/emit.go b/src/runtime/coverage/emit.go
index 6fe04daea8..6510c889ea 100644
--- a/src/runtime/coverage/emit.go
+++ b/src/runtime/coverage/emit.go
@@ -574,6 +574,9 @@ func (s *emitState) emitCounterDataFile(finalHash [16]byte, w io.Writer) error {
 	return nil
 }
 
+// markProfileEmitted is injected to testmain via linkname.
+//go:linkname markProfileEmitted
+
 // markProfileEmitted signals the runtime/coverage machinery that
 // coverage data output files have already been written out, and there
 // is no need to take any additional action at exit time. This
diff --git a/src/runtime/coverage/testsupport.go b/src/runtime/coverage/testsupport.go
index 4b00f3a0f7..b673d3cd2c 100644
--- a/src/runtime/coverage/testsupport.go
+++ b/src/runtime/coverage/testsupport.go
@@ -22,6 +22,9 @@ import (
 	"unsafe"
 )
 
+// processCoverTestDir is injected in testmain.
+//go:linkname processCoverTestDir
+
 // processCoverTestDir is called (via a linknamed reference) from
 // testmain code when "go test -cover" is in effect. It is not
 // intended to be used other than internally by the Go command's
@@ -277,6 +280,9 @@ func (ts *tstate) readAuxMetaFiles(metafiles string, importpaths map[string]stru
 	return nil
 }
 
+// snapshot is injected in testmain.
+//go:linkname snapshot
+
 // snapshot returns a snapshot of coverage percentage at a moment of
 // time within a running test, so as to support the testing.Coverage()
 // function. This version doesn't examine coverage meta-data, so the
diff --git a/src/runtime/linkname.go b/src/runtime/linkname.go
new file mode 100644
index 0000000000..0f02c6b4e3
--- /dev/null
+++ b/src/runtime/linkname.go
@@ -0,0 +1,49 @@
+// 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 runtime
+
+import _ "unsafe"
+
+// used in time and internal/poll
+//go:linkname nanotime
+
+// used in internal/godebug and syscall
+//go:linkname write
+
+// used in internal/runtime/atomic
+//go:linkname goarm
+
+// used by cgo
+//go:linkname cgocall
+//go:linkname _cgo_panic_internal
+//go:linkname cgoAlwaysFalse
+//go:linkname cgoUse
+//go:linkname cgoCheckPointer
+//go:linkname cgoCheckResult
+//go:linkname cgoNoCallback
+//go:linkname gobytes
+//go:linkname gostringn
+//go:linkname throw
+
+// used in plugin
+//go:linkname doInit
+
+// used in math/bits
+//go:linkname overflowError
+//go:linkname divideError
+
+// used in runtime/coverage and in tests
+//go:linkname addExitHook
+
+// used in x/sys/cpu
+//go:linkname getAuxv
+
+// used in tests
+//go:linkname extraMInUse
+//go:linkname getm
+//go:linkname blockevent
+//go:linkname haveHighResSleep
+//go:linkname blockUntilEmptyFinalizerQueue
+//go:linkname lockedOSThread
diff --git a/src/runtime/linkname_unix.go b/src/runtime/linkname_unix.go
new file mode 100644
index 0000000000..65f876fa4b
--- /dev/null
+++ b/src/runtime/linkname_unix.go
@@ -0,0 +1,12 @@
+// 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.
+
+//go:build unix
+
+package runtime
+
+import _ "unsafe"
+
+// used in internal/syscall/unix
+//go:linkname fcntl
diff --git a/src/runtime/netpoll.go b/src/runtime/netpoll.go
index bbfef80aec..7b37d91b24 100644
--- a/src/runtime/netpoll.go
+++ b/src/runtime/netpoll.go
@@ -207,6 +207,9 @@ var (
 	netpollWaiters atomic.Uint32
 )
 
+// netpollWaiters is accessed in tests
+//go:linkname netpollWaiters
+
 //go:linkname poll_runtime_pollServerInit internal/poll.runtime_pollServerInit
 func poll_runtime_pollServerInit() {
 	netpollGenericInit()
diff --git a/src/runtime/string.go b/src/runtime/string.go
index e01b7fc744..81d1b80e56 100644
--- a/src/runtime/string.go
+++ b/src/runtime/string.go
@@ -312,7 +312,7 @@ func gobytes(p *byte, n int) (b []byte) {
 	return
 }
 
-// This is exported via linkname to assembly in syscall (for Plan9).
+// This is exported via linkname to assembly in syscall (for Plan9) and cgo.
 //
 //go:linkname gostring
 func gostring(p *byte) string {
diff --git a/src/runtime/vdso_linux_amd64.go b/src/runtime/vdso_linux_amd64.go
index 4e9f748f4a..9c56409137 100644
--- a/src/runtime/vdso_linux_amd64.go
+++ b/src/runtime/vdso_linux_amd64.go
@@ -4,6 +4,8 @@
 
 package runtime
 
+import _ "unsafe" // for linkname
+
 const (
 	// vdsoArrayMax is the byte-size of a maximally sized array on this architecture.
 	// See cmd/compile/internal/amd64/galign.go arch.MAXWIDTH initialization.
@@ -21,3 +23,6 @@ var (
 	vdsoGettimeofdaySym uintptr
 	vdsoClockgettimeSym uintptr
 )
+
+// vdsoGettimeofdaySym is accessed from the syscall package.
+//go:linkname vdsoGettimeofdaySym