mirror of https://github.com/golang/go.git
90 lines
2.4 KiB
Go
90 lines
2.4 KiB
Go
// run
|
|
|
|
// 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.
|
|
|
|
// windows doesn't work, because Windows exception handling
|
|
// delivers signals based on the current PC, and that current PC
|
|
// doesn't go into the Go runtime.
|
|
// +build !windows
|
|
|
|
// wasm does not work, because the linear memory is not executable.
|
|
// +build !wasm
|
|
|
|
// This test doesn't work on gccgo/GoLLVM, because they will not find
|
|
// any unwind information for the artificial function, and will not be
|
|
// able to unwind past that point.
|
|
// +build !gccgo
|
|
|
|
package main
|
|
|
|
import (
|
|
"encoding/binary"
|
|
"runtime"
|
|
"runtime/debug"
|
|
"unsafe"
|
|
)
|
|
|
|
func main() {
|
|
debug.SetPanicOnFault(true)
|
|
defer func() {
|
|
if err := recover(); err == nil {
|
|
panic("not panicking")
|
|
}
|
|
pc, _, _, _ := runtime.Caller(10)
|
|
f := runtime.FuncForPC(pc)
|
|
if f == nil || f.Name() != "main.f" {
|
|
if f == nil {
|
|
println("no func for ", unsafe.Pointer(pc))
|
|
} else {
|
|
println("found func:", f.Name())
|
|
}
|
|
panic("cannot find main.f on stack")
|
|
}
|
|
}()
|
|
f(20)
|
|
}
|
|
|
|
func f(n int) {
|
|
if n > 0 {
|
|
f(n - 1)
|
|
}
|
|
var f struct {
|
|
x uintptr
|
|
}
|
|
|
|
// We want to force a seg fault, to get a crash at a PC value != 0.
|
|
// Not all systems make the data section non-executable.
|
|
ill := make([]byte, 64)
|
|
switch runtime.GOARCH {
|
|
case "386", "amd64":
|
|
ill = append(ill, 0x89, 0x04, 0x25, 0x00, 0x00, 0x00, 0x00) // MOVL AX, 0
|
|
case "arm":
|
|
binary.LittleEndian.PutUint32(ill, 0xe3a00000) // MOVW $0, R0
|
|
binary.LittleEndian.PutUint32(ill, 0xe5800000) // MOVW R0, (R0)
|
|
case "arm64":
|
|
binary.LittleEndian.PutUint32(ill, 0xf90003ff) // MOVD ZR, (ZR)
|
|
case "ppc64":
|
|
binary.BigEndian.PutUint32(ill, 0xf8000000) // MOVD R0, (R0)
|
|
case "ppc64le":
|
|
binary.LittleEndian.PutUint32(ill, 0xf8000000) // MOVD R0, (R0)
|
|
case "mips", "mips64":
|
|
binary.BigEndian.PutUint32(ill, 0xfc000000) // MOVV R0, (R0)
|
|
case "mipsle", "mips64le":
|
|
binary.LittleEndian.PutUint32(ill, 0xfc000000) // MOVV R0, (R0)
|
|
case "s390x":
|
|
ill = append(ill, 0xa7, 0x09, 0x00, 0x00) // MOVD $0, R0
|
|
ill = append(ill, 0xe3, 0x00, 0x00, 0x00, 0x00, 0x24) // MOVD R0, (R0)
|
|
case "riscv64":
|
|
binary.LittleEndian.PutUint32(ill, 0x00003023) // MOV X0, (X0)
|
|
default:
|
|
// Just leave it as 0 and hope for the best.
|
|
}
|
|
|
|
f.x = uintptr(unsafe.Pointer(&ill[0]))
|
|
p := &f
|
|
fn := *(*func())(unsafe.Pointer(&p))
|
|
fn()
|
|
}
|