1 files changed, 80 insertions, 0 deletions
diff --git a/src/runtime/internal/atomic/atomic_386.go b/src/runtime/internal/atomic/atomic_386.go
new file mode 100644
index 0000000000..ae7b58325a
--- /dev/null
+++ b/src/runtime/internal/atomic/atomic_386.go
@@ -0,0 +1,80 @@
+// Copyright 2009 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 386
+
+package atomic
+
+import "unsafe"
+
+// The calls to nop are to keep these functions from being inlined.
+// If they are inlined we have no guarantee that later rewrites of the
+// code by optimizers will preserve the relative order of memory accesses.
+
+//go:nosplit
+func Load(ptr *uint32) uint32 {
+	nop()
+	return *ptr
+}
+
+//go:nosplit
+func Loadp(ptr unsafe.Pointer) unsafe.Pointer {
+	nop()
+	return *(*unsafe.Pointer)(ptr)
+}
+
+//go:nosplit
+func Xadd64(ptr *uint64, delta int64) uint64 {
+	for {
+		old := *ptr
+		if Cas64(ptr, old, old+uint64(delta)) {
+			return old + uint64(delta)
+		}
+	}
+}
+
+//go:noescape
+func Xadduintptr(ptr *uintptr, delta uintptr) uintptr
+
+//go:nosplit
+func Xchg64(ptr *uint64, new uint64) uint64 {
+	for {
+		old := *ptr
+		if Cas64(ptr, old, new) {
+			return old
+		}
+	}
+}
+
+//go:noescape
+func Xadd(ptr *uint32, delta int32) uint32
+
+//go:noescape
+func Xchg(ptr *uint32, new uint32) uint32
+
+//go:noescape
+func Xchguintptr(ptr *uintptr, new uintptr) uintptr
+
+//go:noescape
+func Load64(ptr *uint64) uint64
+
+//go:noescape
+func And8(ptr *uint8, val uint8)
+
+//go:noescape
+func Or8(ptr *uint8, val uint8)
+
+// NOTE: Do not add atomicxor8 (XOR is not idempotent).
+
+//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)