From 47ab3d4a42e9ab51c465c4322d2ec233f6324e6b Mon Sep 17 00:00:00 2001 From: Daniel Baumann Date: Sun, 28 Apr 2024 15:16:40 +0200 Subject: Adding upstream version 1.18.10. Signed-off-by: Daniel Baumann --- src/runtime/testdata/testprog/badtraceback.go | 50 +++++++++++++++++++++++++++ 1 file changed, 50 insertions(+) create mode 100644 src/runtime/testdata/testprog/badtraceback.go (limited to 'src/runtime/testdata/testprog/badtraceback.go') diff --git a/src/runtime/testdata/testprog/badtraceback.go b/src/runtime/testdata/testprog/badtraceback.go new file mode 100644 index 0000000..09aa2b8 --- /dev/null +++ b/src/runtime/testdata/testprog/badtraceback.go @@ -0,0 +1,50 @@ +// Copyright 2018 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 ( + "runtime" + "runtime/debug" + "unsafe" +) + +func init() { + register("BadTraceback", BadTraceback) +} + +func BadTraceback() { + // Disable GC to prevent traceback at unexpected time. + debug.SetGCPercent(-1) + // Out of an abundance of caution, also make sure that there are + // no GCs actively in progress. + runtime.GC() + + // Run badLR1 on its own stack to minimize the stack size and + // exercise the stack bounds logic in the hex dump. + go badLR1() + select {} +} + +//go:noinline +func badLR1() { + // We need two frames on LR machines because we'll smash this + // frame's saved LR. + badLR2(0) +} + +//go:noinline +func badLR2(arg int) { + // Smash the return PC or saved LR. + lrOff := unsafe.Sizeof(uintptr(0)) + if runtime.GOARCH == "ppc64" || runtime.GOARCH == "ppc64le" { + lrOff = 32 // FIXED_FRAME or sys.MinFrameSize + } + lrPtr := (*uintptr)(unsafe.Pointer(uintptr(unsafe.Pointer(&arg)) - lrOff)) + *lrPtr = 0xbad + + // Print a backtrace. This should include diagnostics for the + // bad return PC and a hex dump. + panic("backtrace") +} -- cgit v1.2.3