all: remove nacl (part 3, more amd64p32)

Part 1: CL 199499 (GOOS nacl)
Part 2: CL 200077 (amd64p32 files, toolchain)
Part 3: stuff that arguably should've been part of Part 2, but I forgot
        one of my grep patterns when splitting the original CL up into
        two parts.

This one might also have interesting stuff to resurrect for any future
x32 ABI support.

Updates #30439

Change-Id: I2b4143374a253a003666f3c69e776b7e456bdb9c
Reviewed-on: https://go-review.googlesource.com/c/go/+/200318
Run-TryBot: Brad Fitzpatrick <bradfitz@golang.org>
TryBot-Result: Gobot Gobot <gobot@golang.org>
Reviewed-by: Ian Lance Taylor <iant@golang.org>

1 files changed, 89 insertions, 0 deletions

diff --git a/src/runtime/internal/atomic/atomic_amd64.go b/src/runtime/internal/atomic/atomic_amd64.go
new file mode 100644
index 0000000000..fc865e892d
--- /dev/null
+++ b/src/runtime/internal/atomic/atomic_amd64.go
@@ -0,0 +1,89 @@
+// 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.
+
+package atomic
+
+import "unsafe"
+
+// Export some functions via linkname to assembly in sync/atomic.
+//go:linkname Load
+//go:linkname Loadp
+//go:linkname Load64
+
+//go:nosplit
+//go:noinline
+func Load(ptr *uint32) uint32 {
+	return *ptr
+}
+
+//go:nosplit
+//go:noinline
+func Loadp(ptr unsafe.Pointer) unsafe.Pointer {
+	return *(*unsafe.Pointer)(ptr)
+}
+
+//go:nosplit
+//go:noinline
+func Load64(ptr *uint64) uint64 {
+	return *ptr
+}
+
+//go:nosplit
+//go:noinline
+func LoadAcq(ptr *uint32) uint32 {
+	return *ptr
+}
+
+//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:nosplit
+//go:noinline
+func Load8(ptr *uint8) uint8 {
+	return *ptr
+}
+
+//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 CasRel(ptr *uint32, old, new uint32) bool
+
+//go:noescape
+func Store(ptr *uint32, val uint32)
+
+//go:noescape
+func Store64(ptr *uint64, val uint64)
+
+//go:noescape
+func StoreRel(ptr *uint32, val uint32)
+
+// StorepNoWB performs *ptr = val atomically and without a write
+// barrier.
+//
+// NO go:noescape annotation; see atomic_pointer.go.
+func StorepNoWB(ptr unsafe.Pointer, val unsafe.Pointer)