1501edd29b823ce1301d2effdd3a9e4b6e2b20b76Jeff Brown/* 2501edd29b823ce1301d2effdd3a9e4b6e2b20b76Jeff Brown * Copyright (C) 2011 The Android Open Source Project 3501edd29b823ce1301d2effdd3a9e4b6e2b20b76Jeff Brown * 4501edd29b823ce1301d2effdd3a9e4b6e2b20b76Jeff Brown * Licensed under the Apache License, Version 2.0 (the "License"); 5501edd29b823ce1301d2effdd3a9e4b6e2b20b76Jeff Brown * you may not use this file except in compliance with the License. 6501edd29b823ce1301d2effdd3a9e4b6e2b20b76Jeff Brown * You may obtain a copy of the License at 7501edd29b823ce1301d2effdd3a9e4b6e2b20b76Jeff Brown * 8501edd29b823ce1301d2effdd3a9e4b6e2b20b76Jeff Brown * http://www.apache.org/licenses/LICENSE-2.0 9501edd29b823ce1301d2effdd3a9e4b6e2b20b76Jeff Brown * 10501edd29b823ce1301d2effdd3a9e4b6e2b20b76Jeff Brown * Unless required by applicable law or agreed to in writing, software 11501edd29b823ce1301d2effdd3a9e4b6e2b20b76Jeff Brown * distributed under the License is distributed on an "AS IS" BASIS, 12501edd29b823ce1301d2effdd3a9e4b6e2b20b76Jeff Brown * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. 13501edd29b823ce1301d2effdd3a9e4b6e2b20b76Jeff Brown * See the License for the specific language governing permissions and 14501edd29b823ce1301d2effdd3a9e4b6e2b20b76Jeff Brown * limitations under the License. 15501edd29b823ce1301d2effdd3a9e4b6e2b20b76Jeff Brown */ 16501edd29b823ce1301d2effdd3a9e4b6e2b20b76Jeff Brown 17501edd29b823ce1301d2effdd3a9e4b6e2b20b76Jeff Brown#define LOG_TAG "Corkscrew" 18501edd29b823ce1301d2effdd3a9e4b6e2b20b76Jeff Brown//#define LOG_NDEBUG 0 19501edd29b823ce1301d2effdd3a9e4b6e2b20b76Jeff Brown 20501edd29b823ce1301d2effdd3a9e4b6e2b20b76Jeff Brown#include "backtrace-arch.h" 21501edd29b823ce1301d2effdd3a9e4b6e2b20b76Jeff Brown#include "backtrace-helper.h" 22501edd29b823ce1301d2effdd3a9e4b6e2b20b76Jeff Brown#include "ptrace-arch.h" 23501edd29b823ce1301d2effdd3a9e4b6e2b20b76Jeff Brown#include <corkscrew/map_info.h> 24501edd29b823ce1301d2effdd3a9e4b6e2b20b76Jeff Brown#include <corkscrew/symbol_table.h> 25501edd29b823ce1301d2effdd3a9e4b6e2b20b76Jeff Brown#include <corkscrew/ptrace.h> 26501edd29b823ce1301d2effdd3a9e4b6e2b20b76Jeff Brown#include <corkscrew/demangle.h> 27501edd29b823ce1301d2effdd3a9e4b6e2b20b76Jeff Brown 28501edd29b823ce1301d2effdd3a9e4b6e2b20b76Jeff Brown#include <unistd.h> 29501edd29b823ce1301d2effdd3a9e4b6e2b20b76Jeff Brown#include <signal.h> 3071363a8075e7916c2166cbdd8a0bf5a180ed4d54Elliott Hughes#include <stdlib.h> 3171363a8075e7916c2166cbdd8a0bf5a180ed4d54Elliott Hughes#include <string.h> 32501edd29b823ce1301d2effdd3a9e4b6e2b20b76Jeff Brown#include <pthread.h> 33501edd29b823ce1301d2effdd3a9e4b6e2b20b76Jeff Brown#include <unwind.h> 34501edd29b823ce1301d2effdd3a9e4b6e2b20b76Jeff Brown#include <cutils/log.h> 35f0c5872637a63e28e3cd314cfc915c07f76df9c6Jeff Brown#include <cutils/atomic.h> 3671363a8075e7916c2166cbdd8a0bf5a180ed4d54Elliott Hughes#include <elf.h> 37501edd29b823ce1301d2effdd3a9e4b6e2b20b76Jeff Brown 38501edd29b823ce1301d2effdd3a9e4b6e2b20b76Jeff Brown#if HAVE_DLADDR 3971363a8075e7916c2166cbdd8a0bf5a180ed4d54Elliott Hughes#define __USE_GNU // For dladdr(3) in glibc. 40501edd29b823ce1301d2effdd3a9e4b6e2b20b76Jeff Brown#include <dlfcn.h> 41501edd29b823ce1301d2effdd3a9e4b6e2b20b76Jeff Brown#endif 42501edd29b823ce1301d2effdd3a9e4b6e2b20b76Jeff Brown 4371363a8075e7916c2166cbdd8a0bf5a180ed4d54Elliott Hughes#if defined(__BIONIC__) 4471363a8075e7916c2166cbdd8a0bf5a180ed4d54Elliott Hughes 4571363a8075e7916c2166cbdd8a0bf5a180ed4d54Elliott Hughes// Bionic implements and exports gettid but only implements tgkill. 4671363a8075e7916c2166cbdd8a0bf5a180ed4d54Elliott Hughesextern int tgkill(int tgid, int tid, int sig); 4771363a8075e7916c2166cbdd8a0bf5a180ed4d54Elliott Hughes 4871363a8075e7916c2166cbdd8a0bf5a180ed4d54Elliott Hughes#else 4971363a8075e7916c2166cbdd8a0bf5a180ed4d54Elliott Hughes 5071363a8075e7916c2166cbdd8a0bf5a180ed4d54Elliott Hughes// glibc doesn't implement or export either gettid or tgkill. 5171363a8075e7916c2166cbdd8a0bf5a180ed4d54Elliott Hughes 5271363a8075e7916c2166cbdd8a0bf5a180ed4d54Elliott Hughes#include <unistd.h> 5371363a8075e7916c2166cbdd8a0bf5a180ed4d54Elliott Hughes#include <sys/syscall.h> 5471363a8075e7916c2166cbdd8a0bf5a180ed4d54Elliott Hughes 5571363a8075e7916c2166cbdd8a0bf5a180ed4d54Elliott Hughesstatic pid_t gettid() { 5671363a8075e7916c2166cbdd8a0bf5a180ed4d54Elliott Hughes return syscall(__NR_gettid); 5771363a8075e7916c2166cbdd8a0bf5a180ed4d54Elliott Hughes} 5871363a8075e7916c2166cbdd8a0bf5a180ed4d54Elliott Hughes 5971363a8075e7916c2166cbdd8a0bf5a180ed4d54Elliott Hughesstatic int tgkill(int tgid, int tid, int sig) { 6071363a8075e7916c2166cbdd8a0bf5a180ed4d54Elliott Hughes return syscall(__NR_tgkill, tgid, tid, sig); 6171363a8075e7916c2166cbdd8a0bf5a180ed4d54Elliott Hughes} 6271363a8075e7916c2166cbdd8a0bf5a180ed4d54Elliott Hughes 6371363a8075e7916c2166cbdd8a0bf5a180ed4d54Elliott Hughes#endif 6471363a8075e7916c2166cbdd8a0bf5a180ed4d54Elliott Hughes 65501edd29b823ce1301d2effdd3a9e4b6e2b20b76Jeff Browntypedef struct { 66501edd29b823ce1301d2effdd3a9e4b6e2b20b76Jeff Brown backtrace_frame_t* backtrace; 67501edd29b823ce1301d2effdd3a9e4b6e2b20b76Jeff Brown size_t ignore_depth; 68501edd29b823ce1301d2effdd3a9e4b6e2b20b76Jeff Brown size_t max_depth; 69501edd29b823ce1301d2effdd3a9e4b6e2b20b76Jeff Brown size_t ignored_frames; 70501edd29b823ce1301d2effdd3a9e4b6e2b20b76Jeff Brown size_t returned_frames; 71f0c5872637a63e28e3cd314cfc915c07f76df9c6Jeff Brown memory_t memory; 72501edd29b823ce1301d2effdd3a9e4b6e2b20b76Jeff Brown} backtrace_state_t; 73501edd29b823ce1301d2effdd3a9e4b6e2b20b76Jeff Brown 74501edd29b823ce1301d2effdd3a9e4b6e2b20b76Jeff Brownstatic _Unwind_Reason_Code unwind_backtrace_callback(struct _Unwind_Context* context, void* arg) { 75501edd29b823ce1301d2effdd3a9e4b6e2b20b76Jeff Brown backtrace_state_t* state = (backtrace_state_t*)arg; 76501edd29b823ce1301d2effdd3a9e4b6e2b20b76Jeff Brown uintptr_t pc = _Unwind_GetIP(context); 77501edd29b823ce1301d2effdd3a9e4b6e2b20b76Jeff Brown if (pc) { 78501edd29b823ce1301d2effdd3a9e4b6e2b20b76Jeff Brown // TODO: Get information about the stack layout from the _Unwind_Context. 79501edd29b823ce1301d2effdd3a9e4b6e2b20b76Jeff Brown // This will require a new architecture-specific function to query 80501edd29b823ce1301d2effdd3a9e4b6e2b20b76Jeff Brown // the appropriate registers. Current callers of unwind_backtrace 81501edd29b823ce1301d2effdd3a9e4b6e2b20b76Jeff Brown // don't need this information, so we won't bother collecting it just yet. 82f0c5872637a63e28e3cd314cfc915c07f76df9c6Jeff Brown add_backtrace_entry(rewind_pc_arch(&state->memory, pc), state->backtrace, 83501edd29b823ce1301d2effdd3a9e4b6e2b20b76Jeff Brown state->ignore_depth, state->max_depth, 84501edd29b823ce1301d2effdd3a9e4b6e2b20b76Jeff Brown &state->ignored_frames, &state->returned_frames); 85501edd29b823ce1301d2effdd3a9e4b6e2b20b76Jeff Brown } 86501edd29b823ce1301d2effdd3a9e4b6e2b20b76Jeff Brown return state->returned_frames < state->max_depth ? _URC_NO_REASON : _URC_END_OF_STACK; 87501edd29b823ce1301d2effdd3a9e4b6e2b20b76Jeff Brown} 88501edd29b823ce1301d2effdd3a9e4b6e2b20b76Jeff Brown 89501edd29b823ce1301d2effdd3a9e4b6e2b20b76Jeff Brownssize_t unwind_backtrace(backtrace_frame_t* backtrace, size_t ignore_depth, size_t max_depth) { 90f0c5872637a63e28e3cd314cfc915c07f76df9c6Jeff Brown ALOGV("Unwinding current thread %d.", gettid()); 91f0c5872637a63e28e3cd314cfc915c07f76df9c6Jeff Brown 92f0c5872637a63e28e3cd314cfc915c07f76df9c6Jeff Brown map_info_t* milist = acquire_my_map_info_list(); 93f0c5872637a63e28e3cd314cfc915c07f76df9c6Jeff Brown 94501edd29b823ce1301d2effdd3a9e4b6e2b20b76Jeff Brown backtrace_state_t state; 95501edd29b823ce1301d2effdd3a9e4b6e2b20b76Jeff Brown state.backtrace = backtrace; 96501edd29b823ce1301d2effdd3a9e4b6e2b20b76Jeff Brown state.ignore_depth = ignore_depth; 97501edd29b823ce1301d2effdd3a9e4b6e2b20b76Jeff Brown state.max_depth = max_depth; 98501edd29b823ce1301d2effdd3a9e4b6e2b20b76Jeff Brown state.ignored_frames = 0; 99501edd29b823ce1301d2effdd3a9e4b6e2b20b76Jeff Brown state.returned_frames = 0; 100f0c5872637a63e28e3cd314cfc915c07f76df9c6Jeff Brown init_memory(&state.memory, milist); 101501edd29b823ce1301d2effdd3a9e4b6e2b20b76Jeff Brown 102501edd29b823ce1301d2effdd3a9e4b6e2b20b76Jeff Brown _Unwind_Reason_Code rc =_Unwind_Backtrace(unwind_backtrace_callback, &state); 103f0c5872637a63e28e3cd314cfc915c07f76df9c6Jeff Brown 104f0c5872637a63e28e3cd314cfc915c07f76df9c6Jeff Brown release_my_map_info_list(milist); 105f0c5872637a63e28e3cd314cfc915c07f76df9c6Jeff Brown 106501edd29b823ce1301d2effdd3a9e4b6e2b20b76Jeff Brown if (state.returned_frames) { 107501edd29b823ce1301d2effdd3a9e4b6e2b20b76Jeff Brown return state.returned_frames; 108501edd29b823ce1301d2effdd3a9e4b6e2b20b76Jeff Brown } 109501edd29b823ce1301d2effdd3a9e4b6e2b20b76Jeff Brown return rc == _URC_END_OF_STACK ? 0 : -1; 110501edd29b823ce1301d2effdd3a9e4b6e2b20b76Jeff Brown} 111501edd29b823ce1301d2effdd3a9e4b6e2b20b76Jeff Brown 112501edd29b823ce1301d2effdd3a9e4b6e2b20b76Jeff Brown#ifdef CORKSCREW_HAVE_ARCH 113677545639cbc3d3018146534f27c8f5bdcd1bb46Jeff Brownstatic const int32_t STATE_DUMPING = -1; 114677545639cbc3d3018146534f27c8f5bdcd1bb46Jeff Brownstatic const int32_t STATE_DONE = -2; 115677545639cbc3d3018146534f27c8f5bdcd1bb46Jeff Brownstatic const int32_t STATE_CANCEL = -3; 116677545639cbc3d3018146534f27c8f5bdcd1bb46Jeff Brown 117501edd29b823ce1301d2effdd3a9e4b6e2b20b76Jeff Brownstatic pthread_mutex_t g_unwind_signal_mutex = PTHREAD_MUTEX_INITIALIZER; 118501edd29b823ce1301d2effdd3a9e4b6e2b20b76Jeff Brownstatic volatile struct { 119677545639cbc3d3018146534f27c8f5bdcd1bb46Jeff Brown int32_t tid_state; 120f0c5872637a63e28e3cd314cfc915c07f76df9c6Jeff Brown const map_info_t* map_info_list; 121501edd29b823ce1301d2effdd3a9e4b6e2b20b76Jeff Brown backtrace_frame_t* backtrace; 122501edd29b823ce1301d2effdd3a9e4b6e2b20b76Jeff Brown size_t ignore_depth; 123501edd29b823ce1301d2effdd3a9e4b6e2b20b76Jeff Brown size_t max_depth; 124501edd29b823ce1301d2effdd3a9e4b6e2b20b76Jeff Brown size_t returned_frames; 125501edd29b823ce1301d2effdd3a9e4b6e2b20b76Jeff Brown} g_unwind_signal_state; 126501edd29b823ce1301d2effdd3a9e4b6e2b20b76Jeff Brown 12746beebea823878218fc0f14723829d83886af978Edwin Vanestatic void unwind_backtrace_thread_signal_handler(int n __attribute__((unused)), siginfo_t* siginfo, void* sigcontext) { 128677545639cbc3d3018146534f27c8f5bdcd1bb46Jeff Brown if (!android_atomic_acquire_cas(gettid(), STATE_DUMPING, &g_unwind_signal_state.tid_state)) { 129501edd29b823ce1301d2effdd3a9e4b6e2b20b76Jeff Brown g_unwind_signal_state.returned_frames = unwind_backtrace_signal_arch( 130f0c5872637a63e28e3cd314cfc915c07f76df9c6Jeff Brown siginfo, sigcontext, 131f0c5872637a63e28e3cd314cfc915c07f76df9c6Jeff Brown g_unwind_signal_state.map_info_list, 132f0c5872637a63e28e3cd314cfc915c07f76df9c6Jeff Brown g_unwind_signal_state.backtrace, 133501edd29b823ce1301d2effdd3a9e4b6e2b20b76Jeff Brown g_unwind_signal_state.ignore_depth, 134501edd29b823ce1301d2effdd3a9e4b6e2b20b76Jeff Brown g_unwind_signal_state.max_depth); 135677545639cbc3d3018146534f27c8f5bdcd1bb46Jeff Brown android_atomic_release_store(STATE_DONE, &g_unwind_signal_state.tid_state); 136f0c5872637a63e28e3cd314cfc915c07f76df9c6Jeff Brown } else { 137f0c5872637a63e28e3cd314cfc915c07f76df9c6Jeff Brown ALOGV("Received spurious SIGURG on thread %d that was intended for thread %d.", 138677545639cbc3d3018146534f27c8f5bdcd1bb46Jeff Brown gettid(), android_atomic_acquire_load(&g_unwind_signal_state.tid_state)); 139501edd29b823ce1301d2effdd3a9e4b6e2b20b76Jeff Brown } 140501edd29b823ce1301d2effdd3a9e4b6e2b20b76Jeff Brown} 141501edd29b823ce1301d2effdd3a9e4b6e2b20b76Jeff Brown#endif 142501edd29b823ce1301d2effdd3a9e4b6e2b20b76Jeff Brown 143501edd29b823ce1301d2effdd3a9e4b6e2b20b76Jeff Brownssize_t unwind_backtrace_thread(pid_t tid, backtrace_frame_t* backtrace, 144501edd29b823ce1301d2effdd3a9e4b6e2b20b76Jeff Brown size_t ignore_depth, size_t max_depth) { 145f0c5872637a63e28e3cd314cfc915c07f76df9c6Jeff Brown if (tid == gettid()) { 146f0c5872637a63e28e3cd314cfc915c07f76df9c6Jeff Brown return unwind_backtrace(backtrace, ignore_depth + 1, max_depth); 147f0c5872637a63e28e3cd314cfc915c07f76df9c6Jeff Brown } 148f0c5872637a63e28e3cd314cfc915c07f76df9c6Jeff Brown 149f0c5872637a63e28e3cd314cfc915c07f76df9c6Jeff Brown ALOGV("Unwinding thread %d from thread %d.", tid, gettid()); 150f0c5872637a63e28e3cd314cfc915c07f76df9c6Jeff Brown 151501edd29b823ce1301d2effdd3a9e4b6e2b20b76Jeff Brown#ifdef CORKSCREW_HAVE_ARCH 152501edd29b823ce1301d2effdd3a9e4b6e2b20b76Jeff Brown struct sigaction act; 153501edd29b823ce1301d2effdd3a9e4b6e2b20b76Jeff Brown struct sigaction oact; 154501edd29b823ce1301d2effdd3a9e4b6e2b20b76Jeff Brown memset(&act, 0, sizeof(act)); 155501edd29b823ce1301d2effdd3a9e4b6e2b20b76Jeff Brown act.sa_sigaction = unwind_backtrace_thread_signal_handler; 156677545639cbc3d3018146534f27c8f5bdcd1bb46Jeff Brown act.sa_flags = SA_RESTART | SA_SIGINFO | SA_ONSTACK; 157501edd29b823ce1301d2effdd3a9e4b6e2b20b76Jeff Brown sigemptyset(&act.sa_mask); 158501edd29b823ce1301d2effdd3a9e4b6e2b20b76Jeff Brown 159501edd29b823ce1301d2effdd3a9e4b6e2b20b76Jeff Brown pthread_mutex_lock(&g_unwind_signal_mutex); 160f0c5872637a63e28e3cd314cfc915c07f76df9c6Jeff Brown map_info_t* milist = acquire_my_map_info_list(); 161501edd29b823ce1301d2effdd3a9e4b6e2b20b76Jeff Brown 162501edd29b823ce1301d2effdd3a9e4b6e2b20b76Jeff Brown ssize_t frames = -1; 163501edd29b823ce1301d2effdd3a9e4b6e2b20b76Jeff Brown if (!sigaction(SIGURG, &act, &oact)) { 164f0c5872637a63e28e3cd314cfc915c07f76df9c6Jeff Brown g_unwind_signal_state.map_info_list = milist; 165f0c5872637a63e28e3cd314cfc915c07f76df9c6Jeff Brown g_unwind_signal_state.backtrace = backtrace; 166f0c5872637a63e28e3cd314cfc915c07f76df9c6Jeff Brown g_unwind_signal_state.ignore_depth = ignore_depth; 167f0c5872637a63e28e3cd314cfc915c07f76df9c6Jeff Brown g_unwind_signal_state.max_depth = max_depth; 168f0c5872637a63e28e3cd314cfc915c07f76df9c6Jeff Brown g_unwind_signal_state.returned_frames = 0; 169677545639cbc3d3018146534f27c8f5bdcd1bb46Jeff Brown android_atomic_release_store(tid, &g_unwind_signal_state.tid_state); 170f0c5872637a63e28e3cd314cfc915c07f76df9c6Jeff Brown 171677545639cbc3d3018146534f27c8f5bdcd1bb46Jeff Brown // Signal the specific thread that we want to dump. 172677545639cbc3d3018146534f27c8f5bdcd1bb46Jeff Brown int32_t tid_state = tid; 173677545639cbc3d3018146534f27c8f5bdcd1bb46Jeff Brown if (tgkill(getpid(), tid, SIGURG)) { 174f0c5872637a63e28e3cd314cfc915c07f76df9c6Jeff Brown ALOGV("Failed to send SIGURG to thread %d.", tid); 175f0c5872637a63e28e3cd314cfc915c07f76df9c6Jeff Brown } else { 176677545639cbc3d3018146534f27c8f5bdcd1bb46Jeff Brown // Wait for the other thread to start dumping the stack, or time out. 177677545639cbc3d3018146534f27c8f5bdcd1bb46Jeff Brown int wait_millis = 250; 178677545639cbc3d3018146534f27c8f5bdcd1bb46Jeff Brown for (;;) { 179677545639cbc3d3018146534f27c8f5bdcd1bb46Jeff Brown tid_state = android_atomic_acquire_load(&g_unwind_signal_state.tid_state); 180677545639cbc3d3018146534f27c8f5bdcd1bb46Jeff Brown if (tid_state != tid) { 181677545639cbc3d3018146534f27c8f5bdcd1bb46Jeff Brown break; 182677545639cbc3d3018146534f27c8f5bdcd1bb46Jeff Brown } 183677545639cbc3d3018146534f27c8f5bdcd1bb46Jeff Brown if (wait_millis--) { 184677545639cbc3d3018146534f27c8f5bdcd1bb46Jeff Brown ALOGV("Waiting for thread %d to start dumping the stack...", tid); 185677545639cbc3d3018146534f27c8f5bdcd1bb46Jeff Brown usleep(1000); 186677545639cbc3d3018146534f27c8f5bdcd1bb46Jeff Brown } else { 187677545639cbc3d3018146534f27c8f5bdcd1bb46Jeff Brown ALOGV("Timed out waiting for thread %d to start dumping the stack.", tid); 188677545639cbc3d3018146534f27c8f5bdcd1bb46Jeff Brown break; 189677545639cbc3d3018146534f27c8f5bdcd1bb46Jeff Brown } 190677545639cbc3d3018146534f27c8f5bdcd1bb46Jeff Brown } 191677545639cbc3d3018146534f27c8f5bdcd1bb46Jeff Brown } 192677545639cbc3d3018146534f27c8f5bdcd1bb46Jeff Brown 193677545639cbc3d3018146534f27c8f5bdcd1bb46Jeff Brown // Try to cancel the dump if it has not started yet. 194677545639cbc3d3018146534f27c8f5bdcd1bb46Jeff Brown if (tid_state == tid) { 195677545639cbc3d3018146534f27c8f5bdcd1bb46Jeff Brown if (!android_atomic_acquire_cas(tid, STATE_CANCEL, &g_unwind_signal_state.tid_state)) { 196677545639cbc3d3018146534f27c8f5bdcd1bb46Jeff Brown ALOGV("Canceled thread %d stack dump.", tid); 197677545639cbc3d3018146534f27c8f5bdcd1bb46Jeff Brown tid_state = STATE_CANCEL; 198677545639cbc3d3018146534f27c8f5bdcd1bb46Jeff Brown } else { 199677545639cbc3d3018146534f27c8f5bdcd1bb46Jeff Brown tid_state = android_atomic_acquire_load(&g_unwind_signal_state.tid_state); 200501edd29b823ce1301d2effdd3a9e4b6e2b20b76Jeff Brown } 201677545639cbc3d3018146534f27c8f5bdcd1bb46Jeff Brown } 202677545639cbc3d3018146534f27c8f5bdcd1bb46Jeff Brown 203677545639cbc3d3018146534f27c8f5bdcd1bb46Jeff Brown // Wait indefinitely for the dump to finish or be canceled. 204677545639cbc3d3018146534f27c8f5bdcd1bb46Jeff Brown // We cannot apply a timeout here because the other thread is accessing state that 205677545639cbc3d3018146534f27c8f5bdcd1bb46Jeff Brown // is owned by this thread, such as milist. It should not take very 206677545639cbc3d3018146534f27c8f5bdcd1bb46Jeff Brown // long to take the dump once started. 207677545639cbc3d3018146534f27c8f5bdcd1bb46Jeff Brown while (tid_state == STATE_DUMPING) { 208677545639cbc3d3018146534f27c8f5bdcd1bb46Jeff Brown ALOGV("Waiting for thread %d to finish dumping the stack...", tid); 209677545639cbc3d3018146534f27c8f5bdcd1bb46Jeff Brown usleep(1000); 210677545639cbc3d3018146534f27c8f5bdcd1bb46Jeff Brown tid_state = android_atomic_acquire_load(&g_unwind_signal_state.tid_state); 211677545639cbc3d3018146534f27c8f5bdcd1bb46Jeff Brown } 212677545639cbc3d3018146534f27c8f5bdcd1bb46Jeff Brown 213677545639cbc3d3018146534f27c8f5bdcd1bb46Jeff Brown if (tid_state == STATE_DONE) { 214501edd29b823ce1301d2effdd3a9e4b6e2b20b76Jeff Brown frames = g_unwind_signal_state.returned_frames; 215501edd29b823ce1301d2effdd3a9e4b6e2b20b76Jeff Brown } 216f0c5872637a63e28e3cd314cfc915c07f76df9c6Jeff Brown 217501edd29b823ce1301d2effdd3a9e4b6e2b20b76Jeff Brown sigaction(SIGURG, &oact, NULL); 218501edd29b823ce1301d2effdd3a9e4b6e2b20b76Jeff Brown } 219501edd29b823ce1301d2effdd3a9e4b6e2b20b76Jeff Brown 220f0c5872637a63e28e3cd314cfc915c07f76df9c6Jeff Brown release_my_map_info_list(milist); 221501edd29b823ce1301d2effdd3a9e4b6e2b20b76Jeff Brown pthread_mutex_unlock(&g_unwind_signal_mutex); 222501edd29b823ce1301d2effdd3a9e4b6e2b20b76Jeff Brown return frames; 223501edd29b823ce1301d2effdd3a9e4b6e2b20b76Jeff Brown#else 224501edd29b823ce1301d2effdd3a9e4b6e2b20b76Jeff Brown return -1; 225501edd29b823ce1301d2effdd3a9e4b6e2b20b76Jeff Brown#endif 226501edd29b823ce1301d2effdd3a9e4b6e2b20b76Jeff Brown} 227501edd29b823ce1301d2effdd3a9e4b6e2b20b76Jeff Brown 228501edd29b823ce1301d2effdd3a9e4b6e2b20b76Jeff Brownssize_t unwind_backtrace_ptrace(pid_t tid, const ptrace_context_t* context, 229501edd29b823ce1301d2effdd3a9e4b6e2b20b76Jeff Brown backtrace_frame_t* backtrace, size_t ignore_depth, size_t max_depth) { 230501edd29b823ce1301d2effdd3a9e4b6e2b20b76Jeff Brown#ifdef CORKSCREW_HAVE_ARCH 231501edd29b823ce1301d2effdd3a9e4b6e2b20b76Jeff Brown return unwind_backtrace_ptrace_arch(tid, context, backtrace, ignore_depth, max_depth); 232501edd29b823ce1301d2effdd3a9e4b6e2b20b76Jeff Brown#else 233501edd29b823ce1301d2effdd3a9e4b6e2b20b76Jeff Brown return -1; 234501edd29b823ce1301d2effdd3a9e4b6e2b20b76Jeff Brown#endif 235501edd29b823ce1301d2effdd3a9e4b6e2b20b76Jeff Brown} 236501edd29b823ce1301d2effdd3a9e4b6e2b20b76Jeff Brown 237501edd29b823ce1301d2effdd3a9e4b6e2b20b76Jeff Brownstatic void init_backtrace_symbol(backtrace_symbol_t* symbol, uintptr_t pc) { 238501edd29b823ce1301d2effdd3a9e4b6e2b20b76Jeff Brown symbol->relative_pc = pc; 23919b39f371be5250e7b9e88016be1e5e665367b3fJeff Brown symbol->relative_symbol_addr = 0; 240f0c5872637a63e28e3cd314cfc915c07f76df9c6Jeff Brown symbol->map_name = NULL; 24119b39f371be5250e7b9e88016be1e5e665367b3fJeff Brown symbol->symbol_name = NULL; 242501edd29b823ce1301d2effdd3a9e4b6e2b20b76Jeff Brown symbol->demangled_name = NULL; 243501edd29b823ce1301d2effdd3a9e4b6e2b20b76Jeff Brown} 244501edd29b823ce1301d2effdd3a9e4b6e2b20b76Jeff Brown 245501edd29b823ce1301d2effdd3a9e4b6e2b20b76Jeff Brownvoid get_backtrace_symbols(const backtrace_frame_t* backtrace, size_t frames, 246501edd29b823ce1301d2effdd3a9e4b6e2b20b76Jeff Brown backtrace_symbol_t* backtrace_symbols) { 247f0c5872637a63e28e3cd314cfc915c07f76df9c6Jeff Brown map_info_t* milist = acquire_my_map_info_list(); 248501edd29b823ce1301d2effdd3a9e4b6e2b20b76Jeff Brown for (size_t i = 0; i < frames; i++) { 249501edd29b823ce1301d2effdd3a9e4b6e2b20b76Jeff Brown const backtrace_frame_t* frame = &backtrace[i]; 250501edd29b823ce1301d2effdd3a9e4b6e2b20b76Jeff Brown backtrace_symbol_t* symbol = &backtrace_symbols[i]; 251501edd29b823ce1301d2effdd3a9e4b6e2b20b76Jeff Brown init_backtrace_symbol(symbol, frame->absolute_pc); 252501edd29b823ce1301d2effdd3a9e4b6e2b20b76Jeff Brown 253501edd29b823ce1301d2effdd3a9e4b6e2b20b76Jeff Brown const map_info_t* mi = find_map_info(milist, frame->absolute_pc); 254501edd29b823ce1301d2effdd3a9e4b6e2b20b76Jeff Brown if (mi) { 255501edd29b823ce1301d2effdd3a9e4b6e2b20b76Jeff Brown symbol->relative_pc = frame->absolute_pc - mi->start; 256f0c5872637a63e28e3cd314cfc915c07f76df9c6Jeff Brown if (mi->name[0]) { 257f0c5872637a63e28e3cd314cfc915c07f76df9c6Jeff Brown symbol->map_name = strdup(mi->name); 258f0c5872637a63e28e3cd314cfc915c07f76df9c6Jeff Brown } 259501edd29b823ce1301d2effdd3a9e4b6e2b20b76Jeff Brown#if HAVE_DLADDR 260501edd29b823ce1301d2effdd3a9e4b6e2b20b76Jeff Brown Dl_info info; 261501edd29b823ce1301d2effdd3a9e4b6e2b20b76Jeff Brown if (dladdr((const void*)frame->absolute_pc, &info) && info.dli_sname) { 26219b39f371be5250e7b9e88016be1e5e665367b3fJeff Brown symbol->relative_symbol_addr = (uintptr_t)info.dli_saddr 26319b39f371be5250e7b9e88016be1e5e665367b3fJeff Brown - (uintptr_t)info.dli_fbase; 26419b39f371be5250e7b9e88016be1e5e665367b3fJeff Brown symbol->symbol_name = strdup(info.dli_sname); 26519b39f371be5250e7b9e88016be1e5e665367b3fJeff Brown symbol->demangled_name = demangle_symbol_name(symbol->symbol_name); 266501edd29b823ce1301d2effdd3a9e4b6e2b20b76Jeff Brown } 267501edd29b823ce1301d2effdd3a9e4b6e2b20b76Jeff Brown#endif 268501edd29b823ce1301d2effdd3a9e4b6e2b20b76Jeff Brown } 269501edd29b823ce1301d2effdd3a9e4b6e2b20b76Jeff Brown } 270f0c5872637a63e28e3cd314cfc915c07f76df9c6Jeff Brown release_my_map_info_list(milist); 271501edd29b823ce1301d2effdd3a9e4b6e2b20b76Jeff Brown} 272501edd29b823ce1301d2effdd3a9e4b6e2b20b76Jeff Brown 273501edd29b823ce1301d2effdd3a9e4b6e2b20b76Jeff Brownvoid get_backtrace_symbols_ptrace(const ptrace_context_t* context, 274501edd29b823ce1301d2effdd3a9e4b6e2b20b76Jeff Brown const backtrace_frame_t* backtrace, size_t frames, 275501edd29b823ce1301d2effdd3a9e4b6e2b20b76Jeff Brown backtrace_symbol_t* backtrace_symbols) { 276501edd29b823ce1301d2effdd3a9e4b6e2b20b76Jeff Brown for (size_t i = 0; i < frames; i++) { 277501edd29b823ce1301d2effdd3a9e4b6e2b20b76Jeff Brown const backtrace_frame_t* frame = &backtrace[i]; 278501edd29b823ce1301d2effdd3a9e4b6e2b20b76Jeff Brown backtrace_symbol_t* symbol = &backtrace_symbols[i]; 279501edd29b823ce1301d2effdd3a9e4b6e2b20b76Jeff Brown init_backtrace_symbol(symbol, frame->absolute_pc); 280501edd29b823ce1301d2effdd3a9e4b6e2b20b76Jeff Brown 281501edd29b823ce1301d2effdd3a9e4b6e2b20b76Jeff Brown const map_info_t* mi; 282501edd29b823ce1301d2effdd3a9e4b6e2b20b76Jeff Brown const symbol_t* s; 283501edd29b823ce1301d2effdd3a9e4b6e2b20b76Jeff Brown find_symbol_ptrace(context, frame->absolute_pc, &mi, &s); 284501edd29b823ce1301d2effdd3a9e4b6e2b20b76Jeff Brown if (mi) { 285501edd29b823ce1301d2effdd3a9e4b6e2b20b76Jeff Brown symbol->relative_pc = frame->absolute_pc - mi->start; 286f0c5872637a63e28e3cd314cfc915c07f76df9c6Jeff Brown if (mi->name[0]) { 287f0c5872637a63e28e3cd314cfc915c07f76df9c6Jeff Brown symbol->map_name = strdup(mi->name); 288f0c5872637a63e28e3cd314cfc915c07f76df9c6Jeff Brown } 289501edd29b823ce1301d2effdd3a9e4b6e2b20b76Jeff Brown } 290501edd29b823ce1301d2effdd3a9e4b6e2b20b76Jeff Brown if (s) { 29119b39f371be5250e7b9e88016be1e5e665367b3fJeff Brown symbol->relative_symbol_addr = s->start; 29219b39f371be5250e7b9e88016be1e5e665367b3fJeff Brown symbol->symbol_name = strdup(s->name); 29319b39f371be5250e7b9e88016be1e5e665367b3fJeff Brown symbol->demangled_name = demangle_symbol_name(symbol->symbol_name); 294501edd29b823ce1301d2effdd3a9e4b6e2b20b76Jeff Brown } 295501edd29b823ce1301d2effdd3a9e4b6e2b20b76Jeff Brown } 296501edd29b823ce1301d2effdd3a9e4b6e2b20b76Jeff Brown} 297501edd29b823ce1301d2effdd3a9e4b6e2b20b76Jeff Brown 298501edd29b823ce1301d2effdd3a9e4b6e2b20b76Jeff Brownvoid free_backtrace_symbols(backtrace_symbol_t* backtrace_symbols, size_t frames) { 299501edd29b823ce1301d2effdd3a9e4b6e2b20b76Jeff Brown for (size_t i = 0; i < frames; i++) { 300501edd29b823ce1301d2effdd3a9e4b6e2b20b76Jeff Brown backtrace_symbol_t* symbol = &backtrace_symbols[i]; 301f0c5872637a63e28e3cd314cfc915c07f76df9c6Jeff Brown free(symbol->map_name); 30219b39f371be5250e7b9e88016be1e5e665367b3fJeff Brown free(symbol->symbol_name); 303501edd29b823ce1301d2effdd3a9e4b6e2b20b76Jeff Brown free(symbol->demangled_name); 304501edd29b823ce1301d2effdd3a9e4b6e2b20b76Jeff Brown init_backtrace_symbol(symbol, 0); 305501edd29b823ce1301d2effdd3a9e4b6e2b20b76Jeff Brown } 306501edd29b823ce1301d2effdd3a9e4b6e2b20b76Jeff Brown} 30719b39f371be5250e7b9e88016be1e5e665367b3fJeff Brown 30846beebea823878218fc0f14723829d83886af978Edwin Vanevoid format_backtrace_line(unsigned frameNumber, const backtrace_frame_t* frame __attribute__((unused)), 30919b39f371be5250e7b9e88016be1e5e665367b3fJeff Brown const backtrace_symbol_t* symbol, char* buffer, size_t bufferSize) { 31019b39f371be5250e7b9e88016be1e5e665367b3fJeff Brown const char* mapName = symbol->map_name ? symbol->map_name : "<unknown>"; 31119b39f371be5250e7b9e88016be1e5e665367b3fJeff Brown const char* symbolName = symbol->demangled_name ? symbol->demangled_name : symbol->symbol_name; 31219b39f371be5250e7b9e88016be1e5e665367b3fJeff Brown size_t fieldWidth = (bufferSize - 80) / 2; 31319b39f371be5250e7b9e88016be1e5e665367b3fJeff Brown if (symbolName) { 31419b39f371be5250e7b9e88016be1e5e665367b3fJeff Brown uint32_t pc_offset = symbol->relative_pc - symbol->relative_symbol_addr; 31519b39f371be5250e7b9e88016be1e5e665367b3fJeff Brown if (pc_offset) { 31619b39f371be5250e7b9e88016be1e5e665367b3fJeff Brown snprintf(buffer, bufferSize, "#%02d pc %08x %.*s (%.*s+%u)", 31719b39f371be5250e7b9e88016be1e5e665367b3fJeff Brown frameNumber, symbol->relative_pc, fieldWidth, mapName, 31819b39f371be5250e7b9e88016be1e5e665367b3fJeff Brown fieldWidth, symbolName, pc_offset); 31919b39f371be5250e7b9e88016be1e5e665367b3fJeff Brown } else { 32019b39f371be5250e7b9e88016be1e5e665367b3fJeff Brown snprintf(buffer, bufferSize, "#%02d pc %08x %.*s (%.*s)", 32119b39f371be5250e7b9e88016be1e5e665367b3fJeff Brown frameNumber, symbol->relative_pc, fieldWidth, mapName, 32219b39f371be5250e7b9e88016be1e5e665367b3fJeff Brown fieldWidth, symbolName); 32319b39f371be5250e7b9e88016be1e5e665367b3fJeff Brown } 32419b39f371be5250e7b9e88016be1e5e665367b3fJeff Brown } else { 32519b39f371be5250e7b9e88016be1e5e665367b3fJeff Brown snprintf(buffer, bufferSize, "#%02d pc %08x %.*s", 32619b39f371be5250e7b9e88016be1e5e665367b3fJeff Brown frameNumber, symbol->relative_pc, fieldWidth, mapName); 32719b39f371be5250e7b9e88016be1e5e665367b3fJeff Brown } 32819b39f371be5250e7b9e88016be1e5e665367b3fJeff Brown} 329