runtime: support vdso for linux/loong64

Contributors to the loong64 port are:
  Weining Lu <luweining@loongson.cn>
  Lei Wang <wanglei@loongson.cn>
  Lingqin Gong <gonglingqin@loongson.cn>
  Xiaolin Zhao <zhaoxiaolin@loongson.cn>
  Meidan Li <limeidan@loongson.cn>
  Xiaojuan Zhai <zhaixiaojuan@loongson.cn>
  Qiyuan Pu <puqiyuan@loongson.cn>
  Guoqi Chen <chenguoqi@loongson.cn>

This port has been updated to Go 1.15.6:
  https://github.com/loongson/go

Updates #46229

Change-Id: Ie9bb5ccfc28e65036e2088c232bb333dcb259a60
Reviewed-on: https://go-review.googlesource.com/c/go/+/368076
Reviewed-by: David Chase <drchase@google.com>
Reviewed-by: Ian Lance Taylor <iant@google.com>
TryBot-Result: Gopher Robot <gobot@golang.org>
Run-TryBot: Ian Lance Taylor <iant@golang.org>
Auto-Submit: Ian Lance Taylor <iant@golang.org>

diff --git a/src/runtime/os_linux_novdso.go b/src/runtime/os_linux_novdso.go
index 1882b90c5e708ef84b5f7764bb4cb1df6db7e1fc..d7e1ea06929d3decb69357345f74f4f904c3cf16 100644 (file)
--- a/src/runtime/os_linux_novdso.go
+++ b/src/runtime/os_linux_novdso.go
@@ -2,7 +2,7 @@
 // Use of this source code is governed by a BSD-style
 // license that can be found in the LICENSE file.
 
-//go:build linux && !386 && !amd64 && !arm && !arm64 && !mips64 && !mips64le && !ppc64 && !ppc64le && !riscv64 && !s390x
+//go:build linux && !386 && !amd64 && !arm && !arm64 && !loong64 && !mips64 && !mips64le && !ppc64 && !ppc64le && !riscv64 && !s390x
 
 package runtime
 

diff --git a/src/runtime/vdso_elf64.go b/src/runtime/vdso_elf64.go
index b50e58f333def70eec2c3b182032ecb6e9841c0d..d41d25e77057659b907a9cbd7ad141742536abd9 100644 (file)
--- a/src/runtime/vdso_elf64.go
+++ b/src/runtime/vdso_elf64.go
@@ -2,7 +2,7 @@
 // Use of this source code is governed by a BSD-style
 // license that can be found in the LICENSE file.
 
-//go:build linux && (amd64 || arm64 || mips64 || mips64le || ppc64 || ppc64le || riscv64 || s390x)
+//go:build linux && (amd64 || arm64 || loong64 || mips64 || mips64le || ppc64 || ppc64le || riscv64 || s390x)
 
 package runtime
 

diff --git a/src/runtime/vdso_in_none.go b/src/runtime/vdso_in_none.go
index a11ecb00efd449695c26cc7adb3c63f8ec3e035c..3a6ee6f049dcde0e5629fbc2e5cda26ec72d08f8 100644 (file)
--- a/src/runtime/vdso_in_none.go
+++ b/src/runtime/vdso_in_none.go
@@ -2,7 +2,7 @@
 // Use of this source code is governed by a BSD-style
 // license that can be found in the LICENSE file.
 
-//go:build (linux && !386 && !amd64 && !arm && !arm64 && !mips64 && !mips64le && !ppc64 && !ppc64le && !riscv64 && !s390x) || !linux
+//go:build (linux && !386 && !amd64 && !arm && !arm64 && !loong64 && !mips64 && !mips64le && !ppc64 && !ppc64le && !riscv64 && !s390x) || !linux
 
 package runtime
 

diff --git a/src/runtime/vdso_linux.go b/src/runtime/vdso_linux.go
index 36b9f426c1b0b60fe0ffddf259ea191a0cca5c68..4523615711614906f5b8d4fb1f2b2c81d5c9ca91 100644 (file)
--- a/src/runtime/vdso_linux.go
+++ b/src/runtime/vdso_linux.go
@@ -2,7 +2,7 @@
 // Use of this source code is governed by a BSD-style
 // license that can be found in the LICENSE file.
 
-//go:build linux && (386 || amd64 || arm || arm64 || mips64 || mips64le || ppc64 || ppc64le || riscv64 || s390x)
+//go:build linux && (386 || amd64 || arm || arm64 || loong64 || mips64 || mips64le || ppc64 || ppc64le || riscv64 || s390x)
 
 package runtime
 

diff --git a/src/runtime/vdso_linux_loong64.go b/src/runtime/vdso_linux_loong64.go
new file mode 100644 (file)
index 0000000..ccf4d95
--- /dev/null
+++ b/src/runtime/vdso_linux_loong64.go
@@ -0,0 +1,27 @@
+// Copyright 2022 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 linux && loong64
+
+package runtime
+
+const (
+       // vdsoArrayMax is the byte-size of a maximally sized array on this architecture.
+       // See cmd/compile/internal/loong64/galign.go arch.MAXWIDTH initialization.
+       vdsoArrayMax = 1<<50 - 1
+)
+
+// see man 7 vdso : loong64
+var vdsoLinuxVersion = vdsoVersionKey{"LINUX_2.6", 0x3ae75f6}
+
+// The symbol name is not __kernel_clock_gettime as suggested by the manpage;
+// according to Linux source code it should be __vdso_clock_gettime instead.
+var vdsoSymbolKeys = []vdsoSymbolKey{
+       {"__vdso_clock_gettime", 0xd35ec75, 0x6e43a318, &vdsoClockgettimeSym},
+}
+
+// initialize to fall back to syscall
+var (
+       vdsoClockgettimeSym uintptr = 0
+)