Adding upstream version 1.20.14.upstream/1.20.14upstream

Signed-off-by: Daniel Baumann <daniel.baumann@progress-linux.org>

3 files changed, 97 insertions, 0 deletions

diff --git a/misc/cgo/testplugin/testdata/issue53989/main.go b/misc/cgo/testplugin/testdata/issue53989/main.go
new file mode 100644
index 0000000..6907dfd
--- /dev/null
+++ b/misc/cgo/testplugin/testdata/issue53989/main.go
@@ -0,0 +1,32 @@
+// 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.
+
+// Issue 53989: the use of jump table caused a function
+// from the plugin jumps in the middle of the function
+// to the function with the same name in the main
+// executable. As these two functions may be compiled
+// differently as plugin needs to be PIC, this causes
+// crash.
+
+package main
+
+import (
+	"plugin"
+
+	"testplugin/issue53989/p"
+)
+
+func main() {
+	p.Square(7) // call the function in main executable
+
+	p, err := plugin.Open("issue53989.so")
+	if err != nil {
+		panic(err)
+	}
+	f, err := p.Lookup("Square")
+	if err != nil {
+		panic(err)
+	}
+	f.(func(int))(7) // call the plugin one
+}
diff --git a/misc/cgo/testplugin/testdata/issue53989/p/p.go b/misc/cgo/testplugin/testdata/issue53989/p/p.go
new file mode 100644
index 0000000..02567c1
--- /dev/null
+++ b/misc/cgo/testplugin/testdata/issue53989/p/p.go
@@ -0,0 +1,52 @@
+// 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.
+
+package p
+
+import (
+	"fmt"
+	"runtime"
+)
+
+var y int
+
+//go:noinline
+func Square(x int) {
+	var pc0, pc1 [1]uintptr
+	runtime.Callers(1, pc0[:]) // get PC at entry
+
+	// a switch using jump table
+	switch x {
+	case 1:
+		y = 1
+	case 2:
+		y = 4
+	case 3:
+		y = 9
+	case 4:
+		y = 16
+	case 5:
+		y = 25
+	case 6:
+		y = 36
+	case 7:
+		y = 49
+	case 8:
+		y = 64
+	default:
+		panic("too large")
+	}
+
+	// check PC is in the same function
+	runtime.Callers(1, pc1[:])
+	if pc1[0] < pc0[0] || pc1[0] > pc0[0]+1000000 {
+		fmt.Printf("jump across DSO boundary. pc0=%x, pc1=%x\n", pc0[0], pc1[0])
+		panic("FAIL")
+	}
+
+	if y != x*x {
+		fmt.Printf("x=%d y=%d!=%d\n", x, y, x*x)
+		panic("FAIL")
+	}
+}
diff --git a/misc/cgo/testplugin/testdata/issue53989/plugin.go b/misc/cgo/testplugin/testdata/issue53989/plugin.go
new file mode 100644
index 0000000..a753ee4
--- /dev/null
+++ b/misc/cgo/testplugin/testdata/issue53989/plugin.go
@@ -0,0 +1,13 @@
+// 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.
+
+package main
+
+import "testplugin/issue53989/p"
+
+func Square(x int) { // export Square for plugin
+	p.Square(x)
+}
+
+func main() {}