|
221
|
1 // -*- C++ -*-
|
|
|
2 //===----------------------------------------------------------------------===//
|
|
|
3 //
|
|
|
4 // Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
|
|
|
5 // See https://llvm.org/LICENSE.txt for license information.
|
|
|
6 // SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
|
|
|
7 //
|
|
|
8 //===----------------------------------------------------------------------===//
|
|
|
9
|
|
|
10 // Ensure that leaf function can be unwund.
|
|
252
|
11 // REQUIRES: target={{(aarch64|riscv64|s390x|x86_64)-.+linux.*}}
|
|
221
|
12
|
|
236
|
13 // TODO: Figure out why this fails with Memory Sanitizer.
|
|
|
14 // XFAIL: msan
|
|
|
15
|
|
|
16 #undef NDEBUG
|
|
221
|
17 #include <assert.h>
|
|
|
18 #include <dlfcn.h>
|
|
|
19 #include <signal.h>
|
|
|
20 #include <stdio.h>
|
|
|
21 #include <stdlib.h>
|
|
|
22 #include <string.h>
|
|
|
23 #include <sys/types.h>
|
|
|
24 #include <unistd.h>
|
|
|
25 #include <unwind.h>
|
|
|
26
|
|
|
27 _Unwind_Reason_Code frame_handler(struct _Unwind_Context* ctx, void* arg) {
|
|
|
28 (void)arg;
|
|
|
29 Dl_info info = { 0, 0, 0, 0 };
|
|
|
30
|
|
236
|
31 // Unwind until the main is reached, above frames deeped on the platform and
|
|
|
32 // architecture.
|
|
221
|
33 if (dladdr(reinterpret_cast<void *>(_Unwind_GetIP(ctx)), &info) &&
|
|
|
34 info.dli_sname && !strcmp("main", info.dli_sname)) {
|
|
|
35 _Exit(0);
|
|
|
36 }
|
|
|
37 return _URC_NO_REASON;
|
|
|
38 }
|
|
|
39
|
|
|
40 void signal_handler(int signum) {
|
|
|
41 (void)signum;
|
|
|
42 _Unwind_Backtrace(frame_handler, NULL);
|
|
|
43 _Exit(-1);
|
|
|
44 }
|
|
|
45
|
|
|
46 __attribute__((noinline)) void crashing_leaf_func(void) {
|
|
236
|
47 // libunwind searches for the address before the return address which points
|
|
|
48 // to the trap instruction. NOP guarantees the trap instruction is not the
|
|
|
49 // first instruction of the function.
|
|
|
50 // We should keep this here for other unwinders that also decrement pc.
|
|
|
51 __asm__ __volatile__("nop");
|
|
|
52 __builtin_trap();
|
|
221
|
53 }
|
|
|
54
|
|
|
55 int main(int, char**) {
|
|
236
|
56 signal(SIGTRAP, signal_handler);
|
|
|
57 signal(SIGILL, signal_handler);
|
|
221
|
58 crashing_leaf_func();
|
|
|
59 return -2;
|
|
236
|
60 }
|
