From b2b8559987bb2f6779fe993bb173e945692f24fc Mon Sep 17 00:00:00 2001
From: Yao Zhang <lunaria21@gmail.com>
Date: Wed, 11 Nov 2015 23:05:06 -0500
Subject: [PATCH] runtime/internal/atomic: added mips64 support.

Change-Id: I2eaf0658771a0ff788429e2f503d116531166315
Reviewed-on: https://go-review.googlesource.com/16834
Reviewed-by: Minux Ma <minux@golang.org>
---
 src/runtime/internal/atomic/arch1_mips64.go   |   9 +
 src/runtime/internal/atomic/arch1_mips64le.go |   9 +
 src/runtime/internal/atomic/asm_mips64x.s     | 231 ++++++++++++++++++
 src/runtime/internal/atomic/atomic_mips64x.go |  56 +++++
 src/runtime/internal/atomic/atomic_mips64x.s  |  36 +++
 5 files changed, 341 insertions(+)
 create mode 100644 src/runtime/internal/atomic/arch1_mips64.go
 create mode 100644 src/runtime/internal/atomic/arch1_mips64le.go
 create mode 100644 src/runtime/internal/atomic/asm_mips64x.s
 create mode 100644 src/runtime/internal/atomic/atomic_mips64x.go
 create mode 100644 src/runtime/internal/atomic/atomic_mips64x.s

diff --git a/src/runtime/internal/atomic/arch1_mips64.go b/src/runtime/internal/atomic/arch1_mips64.go
new file mode 100644
index 0000000000..0fd9510bdc
--- /dev/null
+++ b/src/runtime/internal/atomic/arch1_mips64.go
@@ -0,0 +1,9 @@
+// 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.
+
+package atomic
+
+const (
+	_CacheLineSize = 32
+)
diff --git a/src/runtime/internal/atomic/arch1_mips64le.go b/src/runtime/internal/atomic/arch1_mips64le.go
new file mode 100644
index 0000000000..0fd9510bdc
--- /dev/null
+++ b/src/runtime/internal/atomic/arch1_mips64le.go
@@ -0,0 +1,9 @@
+// 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.
+
+package atomic
+
+const (
+	_CacheLineSize = 32
+)
diff --git a/src/runtime/internal/atomic/asm_mips64x.s b/src/runtime/internal/atomic/asm_mips64x.s
new file mode 100644
index 0000000000..4cab4342f9
--- /dev/null
+++ b/src/runtime/internal/atomic/asm_mips64x.s
@@ -0,0 +1,231 @@
+// 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 mips64 mips64le
+
+#include "textflag.h"
+
+#define LL(base, rt)	WORD	$((060<<26)|((base)<<21)|((rt)<<16))
+#define LLV(base, rt)	WORD	$((064<<26)|((base)<<21)|((rt)<<16))
+#define SC(base, rt)	WORD	$((070<<26)|((base)<<21)|((rt)<<16))
+#define SCV(base, rt)	WORD	$((074<<26)|((base)<<21)|((rt)<<16))
+#define SYNC	WORD $0xf
+
+// bool cas(uint32 *ptr, uint32 old, uint32 new)
+// Atomically:
+//	if(*val == old){
+//		*val = new;
+//		return 1;
+//	} else
+//		return 0;
+TEXT ·Cas(SB), NOSPLIT, $0-17
+	MOVV	ptr+0(FP), R1
+	MOVW	old+8(FP), R2
+	MOVW	new+12(FP), R5
+	SYNC
+cas_again:
+	MOVV	R5, R3
+	LL(1, 4)	// R4 = *R1
+	BNE	R2, R4, cas_fail
+	SC(1, 3)	// *R1 = R3
+	BEQ	R3, cas_again
+	MOVV	$1, R1
+	MOVB	R1, ret+16(FP)
+	SYNC
+	RET
+cas_fail:
+	MOVV	$0, R1
+	JMP	-4(PC)
+
+// bool	cas64(uint64 *ptr, uint64 old, uint64 new)
+// Atomically:
+//	if(*val == *old){
+//		*val = new;
+//		return 1;
+//	} else {
+//		return 0;
+//	}
+TEXT ·Cas64(SB), NOSPLIT, $0-25
+	MOVV	ptr+0(FP), R1
+	MOVV	old+8(FP), R2
+	MOVV	new+16(FP), R5
+	SYNC
+cas64_again:
+	MOVV	R5, R3
+	LLV(1, 4)	// R4 = *R1
+	BNE	R2, R4, cas64_fail
+	SCV(1, 3)	// *R1 = R3
+	BEQ	R3, cas64_again
+	MOVV	$1, R1
+	MOVB	R1, ret+24(FP)
+	SYNC
+	RET
+cas64_fail:
+	MOVV	$0, R1
+	JMP	-4(PC)
+
+TEXT ·Casuintptr(SB), NOSPLIT, $0-25
+	JMP	·Cas64(SB)
+
+TEXT ·Loaduintptr(SB),  NOSPLIT|NOFRAME, $0-16
+	JMP	·Load64(SB)
+
+TEXT ·Loaduint(SB), NOSPLIT|NOFRAME, $0-16
+	JMP	·Load64(SB)
+
+TEXT ·Storeuintptr(SB), NOSPLIT, $0-16
+	JMP	·Store64(SB)
+
+TEXT ·Xadduintptr(SB), NOSPLIT, $0-24
+	JMP	·Xadd64(SB)
+
+TEXT ·Loadint64(SB), NOSPLIT, $0-16
+	JMP	·Load64(SB)
+
+TEXT ·Xaddint64(SB), NOSPLIT, $0-16
+	JMP	·Xadd64(SB)
+
+// bool casp(void **val, void *old, void *new)
+// Atomically:
+//	if(*val == old){
+//		*val = new;
+//		return 1;
+//	} else
+//		return 0;
+TEXT ·Casp1(SB), NOSPLIT, $0-25
+	JMP runtime∕internal∕atomic·Cas64(SB)
+
+// uint32 xadd(uint32 volatile *ptr, int32 delta)
+// Atomically:
+//	*val += delta;
+//	return *val;
+TEXT ·Xadd(SB), NOSPLIT, $0-20
+	MOVV	ptr+0(FP), R2
+	MOVW	delta+8(FP), R3
+	SYNC
+	LL(2, 1)	// R1 = *R2
+	ADDU	R1, R3, R4
+	MOVV	R4, R1
+	SC(2, 4)	// *R2 = R4
+	BEQ	R4, -4(PC)
+	MOVW	R1, ret+16(FP)
+	SYNC
+	RET
+
+TEXT ·Xadd64(SB), NOSPLIT, $0-24
+	MOVV	ptr+0(FP), R2
+	MOVV	delta+8(FP), R3
+	SYNC
+	LLV(2, 1)	// R1 = *R2
+	ADDVU	R1, R3, R4
+	MOVV	R4, R1
+	SCV(2, 4)	// *R2 = R4
+	BEQ	R4, -4(PC)
+	MOVV	R1, ret+16(FP)
+	SYNC
+	RET
+
+TEXT ·Xchg(SB), NOSPLIT, $0-20
+	MOVV	ptr+0(FP), R2
+	MOVW	new+8(FP), R5
+
+	SYNC
+	MOVV	R5, R3
+	LL(2, 1)	// R1 = *R2
+	SC(2, 3)	// *R2 = R3
+	BEQ	R3, -3(PC)
+	MOVW	R1, ret+16(FP)
+	SYNC
+	RET
+
+TEXT ·Xchg64(SB), NOSPLIT, $0-24
+	MOVV	ptr+0(FP), R2
+	MOVV	new+8(FP), R5
+
+	SYNC
+	MOVV	R5, R3
+	LLV(2, 1)	// R1 = *R2
+	SCV(2, 3)	// *R2 = R3
+	BEQ	R3, -3(PC)
+	MOVV	R1, ret+16(FP)
+	SYNC
+	RET
+
+TEXT ·Xchguintptr(SB), NOSPLIT, $0-24
+	JMP	·Xchg64(SB)
+
+TEXT ·Storep1(SB), NOSPLIT, $0-16
+	JMP	·Store64(SB)
+
+TEXT ·Store(SB), NOSPLIT, $0-12
+	MOVV	ptr+0(FP), R1
+	MOVW	val+8(FP), R2
+	SYNC
+	MOVW	R2, 0(R1)
+	SYNC
+	RET
+
+TEXT ·Store64(SB), NOSPLIT, $0-16
+	MOVV	ptr+0(FP), R1
+	MOVV	val+8(FP), R2
+	SYNC
+	MOVV	R2, 0(R1)
+	SYNC
+	RET
+
+// void	Or8(byte volatile*, byte);
+TEXT ·Or8(SB), NOSPLIT, $0-9
+	MOVV	ptr+0(FP), R1
+	MOVBU	val+8(FP), R2
+	// Align ptr down to 4 bytes so we can use 32-bit load/store.
+	MOVV	$~3, R3
+	AND	R1, R3
+	// Compute val shift.
+#ifdef GOARCH_mips64
+	// Big endian.  ptr = ptr ^ 3
+	XOR	$3, R1
+#endif
+	// R4 = ((ptr & 3) * 8)
+	AND	$3, R1, R4
+	SLLV	$3, R4
+	// Shift val for aligned ptr.  R2 = val << R4
+	SLLV	R4, R2
+
+	SYNC
+	LL(3, 4)	// R4 = *R3
+	OR	R2, R4
+	SC(3, 4)	// *R3 = R4
+	BEQ	R4, -4(PC)
+	SYNC
+	RET
+
+// void	And8(byte volatile*, byte);
+TEXT ·And8(SB), NOSPLIT, $0-9
+	MOVV	ptr+0(FP), R1
+	MOVBU	val+8(FP), R2
+	// Align ptr down to 4 bytes so we can use 32-bit load/store.
+	MOVV	$~3, R3
+	AND	R1, R3
+	// Compute val shift.
+#ifdef GOARCH_mips64
+	// Big endian.  ptr = ptr ^ 3
+	XOR	$3, R1
+#endif
+	// R4 = ((ptr & 3) * 8)
+	AND	$3, R1, R4
+	SLLV	$3, R4
+	// Shift val for aligned ptr.  R2 = val << R4 | ^(0xFF << R4)
+	MOVV	$0xFF, R5
+	SLLV	R4, R2
+	SLLV	R4, R5
+	NOR	R0, R5
+	OR	R5, R2
+
+	SYNC
+	LL(3, 4)	// R4 = *R3
+	AND	R2, R4
+	SC(3, 4)	// *R3 = R4
+	BEQ	R4, -4(PC)
+	SYNC
+	RET
diff --git a/src/runtime/internal/atomic/atomic_mips64x.go b/src/runtime/internal/atomic/atomic_mips64x.go
new file mode 100644
index 0000000000..8094db58a0
--- /dev/null
+++ b/src/runtime/internal/atomic/atomic_mips64x.go
@@ -0,0 +1,56 @@
+// 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 mips64 mips64le
+
+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: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)
diff --git a/src/runtime/internal/atomic/atomic_mips64x.s b/src/runtime/internal/atomic/atomic_mips64x.s
new file mode 100644
index 0000000000..ae8500e090
--- /dev/null
+++ b/src/runtime/internal/atomic/atomic_mips64x.s
@@ -0,0 +1,36 @@
+// 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 mips64 mips64le
+
+#include "textflag.h"
+
+#define SYNC	WORD $0xf
+
+// uint32 runtime∕internal∕atomic·Load(uint32 volatile* addr)
+TEXT ·Load(SB),NOSPLIT,$-8-12
+	MOVV	addr+0(FP), R1
+	SYNC
+	MOVWU	0(R1), R1
+	SYNC
+	MOVW	R1, ret+8(FP)
+	RET
+
+// uint64 runtime∕internal∕atomic·Load64(uint64 volatile* addr)
+TEXT ·Load64(SB),NOSPLIT,$-8-16
+	MOVV	addr+0(FP), R1
+	SYNC
+	MOVV	0(R1), R1
+	SYNC
+	MOVV	R1, ret+8(FP)
+	RET
+
+// void *runtime∕internal∕atomic·Loadp(void *volatile *addr)
+TEXT ·Loadp(SB),NOSPLIT,$-8-16
+	MOVV	addr+0(FP), R1
+	SYNC
+	MOVV	0(R1), R1
+	SYNC
+	MOVV	R1, ret+8(FP)
+	RET