mirror of
https://github.com/golang/go
synced 2024-11-24 18:50:05 -07:00
1a82946ea5
An instruction consisting of all 0s causes an illegal instruction signal on s390x. Since 0s are the default in this test this CL just makes it explicit. Change-Id: Id6e060eed1a588f4b10a4e4861709fcd19b434ac Reviewed-on: https://go-review.googlesource.com/20962 Reviewed-by: Minux Ma <minux@golang.org> Run-TryBot: Brad Fitzpatrick <bradfitz@golang.org> TryBot-Result: Gobot Gobot <gobot@golang.org>
78 lines
1.8 KiB
Go
78 lines
1.8 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
|
|
|
|
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 an illegal instruction, 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":
|
|
binary.LittleEndian.PutUint16(ill, 0x0b0f) // ud2
|
|
case "arm":
|
|
binary.LittleEndian.PutUint32(ill, 0xe7f000f0) // no name, but permanently undefined
|
|
case "arm64":
|
|
binary.LittleEndian.PutUint32(ill, 0xd4207d00) // brk #1000
|
|
case "ppc64":
|
|
binary.BigEndian.PutUint32(ill, 0x7fe00008) // trap
|
|
case "ppc64le":
|
|
binary.LittleEndian.PutUint32(ill, 0x7fe00008) // trap
|
|
case "mips64":
|
|
binary.BigEndian.PutUint32(ill, 0x00000034) // trap
|
|
case "mips64le":
|
|
binary.LittleEndian.PutUint32(ill, 0x00000034) // trap
|
|
case "s390x":
|
|
binary.BigEndian.PutUint32(ill, 0) // undefined instruction
|
|
default:
|
|
// Just leave it as 0 and hope for the best.
|
|
}
|
|
|
|
f.x = uintptr(unsafe.Pointer(&ill[0]))
|
|
fn := *(*func())(unsafe.Pointer(&f))
|
|
fn()
|
|
}
|