1 files changed, 80 insertions, 0 deletions
diff --git a/src/runtime/internal/atomic/atomic_arm64.go b/src/runtime/internal/atomic/atomic_arm64.go
new file mode 100644
index 0000000000..6b32346656
--- /dev/null
+++ b/src/runtime/internal/atomic/atomic_arm64.go
@@ -0,0 +1,80 @@
+// 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 arm64
+
+package atomic
+
+import "unsafe"
+
+//go:noescape
+func Xadd(ptr *uint32, delta int32) uint32
+
+//go:noescape
+func Xadd64(ptr *uint64, delta int64) uint64
+
+//go:noescape
+func Xadduintptr(ptr *uintptr, delta uintptr) uintptr
+
+//go:noescape
+func Xchg(ptr *uint32, new uint32) uint32
+
+//go:noescape
+func Xchg64(ptr *uint64, new uint64) uint64
+
+//go:noescape
+func Xchguintptr(ptr *uintptr, new uintptr) uintptr
+
+//go:noescape
+func Load(ptr *uint32) uint32
+
+//go:noescape
+func Load64(ptr *uint64) uint64
+
+//go:noescape
+func Loadp(ptr unsafe.Pointer) unsafe.Pointer
+
+//go:nosplit
+func Or8(addr *uint8, v uint8) {
+	// TODO(dfc) implement this in asm.
+	// Align down to 4 bytes and use 32-bit CAS.
+	uaddr := uintptr(unsafe.Pointer(addr))
+	addr32 := (*uint32)(unsafe.Pointer(uaddr &^ 3))
+	word := uint32(v) << ((uaddr & 3) * 8) // little endian
+	for {
+		old := *addr32
+		if Cas(addr32, old, old|word) {
+			return
+		}
+	}
+}
+
+//go:nosplit
+func And8(addr *uint8, v uint8) {
+	// TODO(dfc) implement this in asm.
+	// Align down to 4 bytes and use 32-bit CAS.
+	uaddr := uintptr(unsafe.Pointer(addr))
+	addr32 := (*uint32)(unsafe.Pointer(uaddr &^ 3))
+	word := uint32(v) << ((uaddr & 3) * 8)    // little endian
+	mask := uint32(0xFF) << ((uaddr & 3) * 8) // little endian
+	word |= ^mask
+	for {
+		old := *addr32
+		if Cas(addr32, old, old&word) {
+			return
+		}
+	}
+}
+
+//go:noescape
+func Cas64(ptr *uint64, old, new uint64) bool
+
+//go:noescape
+func Store(ptr *uint32, val uint32)
+
+//go:noescape
+func Store64(ptr *uint64, val uint64)
+
+// NO go:noescape annotation; see atomic_pointer.go.
+func Storep1(ptr unsafe.Pointer, val unsafe.Pointer)