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92b3138b83
Updated dependencies: * GMP 6.2.1 * ISL 0.24 * MPL 1.2.1 * MPFR 4.1.0 The dependencies were pulled in by running the ./contrib/download_prerequisites script and then manually removing the symbolic links and archives, and renaming the directories (i.e mv isl-0.24 to isl)
57 lines
1.4 KiB
Go
57 lines
1.4 KiB
Go
// Copyright 2020 The Go Authors. All rights reserved.
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// Use of this source code is governed by a BSD-style
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// license that can be found in the LICENSE file.
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//go:build aix || darwin || dragonfly || freebsd || linux || netbsd || openbsd
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// TODO: test on Windows?
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package debug_test
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import (
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"runtime"
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"runtime/debug"
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"syscall"
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"testing"
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"unsafe"
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)
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func TestPanicOnFault(t *testing.T) {
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if runtime.GOARCH == "s390x" {
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t.Skip("s390x fault addresses are missing the low order bits")
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}
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if runtime.GOOS == "ios" {
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t.Skip("iOS doesn't provide fault addresses")
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}
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if runtime.GOOS == "netbsd" && runtime.GOARCH == "arm" {
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t.Skip("netbsd-arm doesn't provide fault address (golang.org/issue/45026)")
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}
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m, err := syscall.Mmap(-1, 0, 0x1000, syscall.PROT_READ /* Note: no PROT_WRITE */, syscall.MAP_SHARED|syscall.MAP_ANON)
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if err != nil {
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t.Fatalf("can't map anonymous memory: %s", err)
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}
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defer syscall.Munmap(m)
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old := debug.SetPanicOnFault(true)
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defer debug.SetPanicOnFault(old)
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const lowBits = 0x3e7
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defer func() {
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r := recover()
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if r == nil {
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t.Fatalf("write did not fault")
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}
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type addressable interface {
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Addr() uintptr
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}
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a, ok := r.(addressable)
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if !ok {
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t.Fatalf("fault does not contain address")
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}
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want := uintptr(unsafe.Pointer(&m[lowBits]))
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got := a.Addr()
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if got != want {
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t.Fatalf("fault address %x, want %x", got, want)
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}
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}()
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m[lowBits] = 1 // will fault
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}
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