1/* 2 * Copyright (C) 2013 The Android Open Source Project 3 * 4 * Licensed under the Apache License, Version 2.0 (the "License"); 5 * you may not use this file except in compliance with the License. 6 * You may obtain a copy of the License at 7 * 8 * http://www.apache.org/licenses/LICENSE-2.0 9 * 10 * Unless required by applicable law or agreed to in writing, software 11 * distributed under the License is distributed on an "AS IS" BASIS, 12 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. 13 * See the License for the specific language governing permissions and 14 * limitations under the License. 15 */ 16 17/* 18 * Contributed by: Intel Corporation 19 */ 20 21#include <gtest/gtest.h> 22 23#include <dlfcn.h> 24#include <signal.h> 25#include <stdio.h> 26#include <stdlib.h> 27#include <string.h> 28#include <sys/types.h> 29#include <unistd.h> 30#include <unwind.h> 31 32#include "ScopedSignalHandler.h" 33 34#define noinline __attribute__((__noinline__)) 35#define __unused __attribute__((__unused__)) 36 37static _Unwind_Reason_Code FrameCounter(_Unwind_Context* ctx __unused, void* arg) { 38 int* count_ptr = reinterpret_cast<int*>(arg); 39 40#if SHOW_FRAME_LOCATIONS 41 void* ip = reinterpret_cast<void*>(_Unwind_GetIP(ctx)); 42 43 const char* symbol = "<unknown>"; 44 int offset = 0; 45 46 Dl_info info; 47 memset(&info, 0, sizeof(info)); 48 if (dladdr(ip, &info) != 0) { 49 symbol = info.dli_sname; 50 if (info.dli_saddr != nullptr) { 51 offset = static_cast<int>(reinterpret_cast<char*>(ip) - reinterpret_cast<char*>(info.dli_saddr)); 52 } 53 } 54 55 fprintf(stderr, " #%02d %p %s%+d (%s)\n", *count_ptr, ip, symbol, offset, info.dli_fname ? info.dli_fname : "??"); 56 fflush(stderr); 57#endif 58 59 ++*count_ptr; 60 return _URC_NO_REASON; 61} 62 63static int noinline unwind_one_frame_deeper() { 64 int count = 0; 65 _Unwind_Backtrace(FrameCounter, &count); 66 return count; 67} 68 69TEST(stack_unwinding, easy) { 70 int count = 0; 71 _Unwind_Backtrace(FrameCounter, &count); 72 int deeper_count = unwind_one_frame_deeper(); 73 ASSERT_EQ(count + 1, deeper_count); 74} 75 76static int killer_count = 0; 77static int handler_count = 0; 78static int handler_one_deeper_count = 0; 79 80static void noinline UnwindSignalHandler(int) { 81 _Unwind_Backtrace(FrameCounter, &handler_count); 82 ASSERT_GT(handler_count, killer_count); 83 84 handler_one_deeper_count = unwind_one_frame_deeper(); 85 ASSERT_EQ(handler_count + 1, handler_one_deeper_count); 86} 87 88TEST(stack_unwinding, unwind_through_signal_frame) { 89 killer_count = handler_count = handler_one_deeper_count = 0; 90 ScopedSignalHandler ssh(SIGUSR1, UnwindSignalHandler); 91 92 _Unwind_Backtrace(FrameCounter, &killer_count); 93 94 ASSERT_EQ(0, kill(getpid(), SIGUSR1)); 95} 96 97// On LP32, the SA_SIGINFO flag gets you __restore_rt instead of __restore. 98TEST(stack_unwinding, unwind_through_signal_frame_SA_SIGINFO) { 99 killer_count = handler_count = handler_one_deeper_count = 0; 100 ScopedSignalHandler ssh(SIGUSR1, UnwindSignalHandler, SA_SIGINFO); 101 102 _Unwind_Backtrace(FrameCounter, &killer_count); 103 104 ASSERT_EQ(0, kill(getpid(), SIGUSR1)); 105} 106