mirror of
https://github.com/golang/go
synced 2024-11-18 14:04:45 -07:00
53fd522c0d
Follows suit with https://go-review.googlesource.com/#/c/20111. Generated by running $ grep -R 'Go Authors. All' * | cut -d":" -f1 | while read F;do perl -pi -e 's/Go Authors. All/Go Authors. All/g' $F;done The code in cmd/internal/unvendor wasn't changed. Fixes #15213 Change-Id: I4f235cee0a62ec435f9e8540a1ec08ae03b1a75f Reviewed-on: https://go-review.googlesource.com/21819 Reviewed-by: Ian Lance Taylor <iant@golang.org> Run-TryBot: Ian Lance Taylor <iant@golang.org> TryBot-Result: Gobot Gobot <gobot@golang.org>
133 lines
3.1 KiB
Go
133 lines
3.1 KiB
Go
// run
|
|
// +build amd64
|
|
// +build linux darwin
|
|
|
|
// Copyright 2016 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 (
|
|
"fmt"
|
|
"syscall"
|
|
)
|
|
|
|
// Use global variables so the compiler
|
|
// doesn't know that they are constants.
|
|
var p = syscall.Getpagesize()
|
|
var zero = 0
|
|
var one = 1
|
|
|
|
func main() {
|
|
// Allocate 2 pages of memory.
|
|
b, err := syscall.Mmap(-1, 0, 2*p, syscall.PROT_READ|syscall.PROT_WRITE, syscall.MAP_ANON|syscall.MAP_PRIVATE)
|
|
if err != nil {
|
|
panic(err)
|
|
}
|
|
// Mark the second page as faulting.
|
|
err = syscall.Mprotect(b[p:], syscall.PROT_NONE)
|
|
if err != nil {
|
|
panic(err)
|
|
}
|
|
// Get a slice pointing to the last byte of the good page.
|
|
x := b[p-one : p]
|
|
|
|
test16(x)
|
|
test16i(x, 0)
|
|
test32(x)
|
|
test32i(x, 0)
|
|
test64(x)
|
|
test64i(x, 0)
|
|
}
|
|
|
|
func test16(x []byte) uint16 {
|
|
defer func() {
|
|
r := recover()
|
|
if r == nil {
|
|
panic("no fault or bounds check failure happened")
|
|
}
|
|
s := fmt.Sprintf("%s", r)
|
|
if s != "runtime error: index out of range" {
|
|
panic("bad panic: " + s)
|
|
}
|
|
}()
|
|
// Try to read 2 bytes from x.
|
|
return uint16(x[0]) | uint16(x[1])<<8
|
|
|
|
// We expect to get an "index out of range" error from x[1].
|
|
// If we promote the first load to a 2-byte load, it will segfault, which we don't want.
|
|
}
|
|
|
|
func test16i(x []byte, i int) uint16 {
|
|
defer func() {
|
|
r := recover()
|
|
if r == nil {
|
|
panic("no fault or bounds check failure happened")
|
|
}
|
|
s := fmt.Sprintf("%s", r)
|
|
if s != "runtime error: index out of range" {
|
|
panic("bad panic: " + s)
|
|
}
|
|
}()
|
|
return uint16(x[i]) | uint16(x[i+1])<<8
|
|
}
|
|
|
|
func test32(x []byte) uint32 {
|
|
defer func() {
|
|
r := recover()
|
|
if r == nil {
|
|
panic("no fault or bounds check failure happened")
|
|
}
|
|
s := fmt.Sprintf("%s", r)
|
|
if s != "runtime error: index out of range" {
|
|
panic("bad panic: " + s)
|
|
}
|
|
}()
|
|
return uint32(x[0]) | uint32(x[1])<<8 | uint32(x[2])<<16 | uint32(x[3])<<24
|
|
}
|
|
|
|
func test32i(x []byte, i int) uint32 {
|
|
defer func() {
|
|
r := recover()
|
|
if r == nil {
|
|
panic("no fault or bounds check failure happened")
|
|
}
|
|
s := fmt.Sprintf("%s", r)
|
|
if s != "runtime error: index out of range" {
|
|
panic("bad panic: " + s)
|
|
}
|
|
}()
|
|
return uint32(x[i]) | uint32(x[i+1])<<8 | uint32(x[i+2])<<16 | uint32(x[i+3])<<24
|
|
}
|
|
|
|
func test64(x []byte) uint64 {
|
|
defer func() {
|
|
r := recover()
|
|
if r == nil {
|
|
panic("no fault or bounds check failure happened")
|
|
}
|
|
s := fmt.Sprintf("%s", r)
|
|
if s != "runtime error: index out of range" {
|
|
panic("bad panic: " + s)
|
|
}
|
|
}()
|
|
return uint64(x[0]) | uint64(x[1])<<8 | uint64(x[2])<<16 | uint64(x[3])<<24 |
|
|
uint64(x[4])<<32 | uint64(x[5])<<40 | uint64(x[6])<<48 | uint64(x[7])<<56
|
|
}
|
|
|
|
func test64i(x []byte, i int) uint64 {
|
|
defer func() {
|
|
r := recover()
|
|
if r == nil {
|
|
panic("no fault or bounds check failure happened")
|
|
}
|
|
s := fmt.Sprintf("%s", r)
|
|
if s != "runtime error: index out of range" {
|
|
panic("bad panic: " + s)
|
|
}
|
|
}()
|
|
return uint64(x[i+0]) | uint64(x[i+1])<<8 | uint64(x[i+2])<<16 | uint64(x[i+3])<<24 |
|
|
uint64(x[i+4])<<32 | uint64(x[i+5])<<40 | uint64(x[i+6])<<48 | uint64(x[i+7])<<56
|
|
}
|