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https://github.com/golang/go
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698bfa17a8
The runtime traceback code assumes non-empty frame has link link register saved on LR architectures. Make sure it is so in the assember. Also make sure that LR is stored before update SP, so the traceback code will not see a half-updated stack frame if a signal comes during the execution of function prologue. Fixes #17381. Change-Id: I668b04501999b7f9b080275a2d1f8a57029cbbb3 Reviewed-on: https://go-review.googlesource.com/31760 Reviewed-by: Michael Munday <munday@ca.ibm.com>
55 lines
1 KiB
Go
55 lines
1 KiB
Go
// run
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// Copyright 2016 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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// issue 17381: make sure leave function with non-empty frame
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// saves link register, so that traceback will work.
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package main
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import (
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"runtime"
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"unsafe"
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)
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func main() {
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defer func() {
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if recover() == nil {
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panic("did not panic")
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}
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pcs := make([]uintptr, 20)
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n := runtime.Callers(1, pcs)
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for _, pc := range pcs[:n] {
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if runtime.FuncForPC(pc).Name() == "main.main" {
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return
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}
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}
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panic("cannot find main.main in backtrace")
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}()
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prep()
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f() // should panic
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}
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func funcPC(f interface{}) uintptr {
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var ptr uintptr
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return **(**uintptr)(unsafe.Pointer(uintptr(unsafe.Pointer(&f)) + unsafe.Sizeof(ptr)))
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}
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//go:noinline
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func f() {
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var t [1]int // non-empty frame
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*(*int)(nil) = t[0]
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}
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var p = funcPC(runtime.GC) + 8
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//go:noinline
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func prep() {
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// put some garbage on stack
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var x = [20]uintptr{p, p, p, p, p, p, p, p, p, p, p, p, p, p, p, p, p, p, p, p}
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_ = x
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}
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