13f951fab4e50260c90a94b75c8a56912828f1fadrouslan@chromium.org// Copyright (c) 2012 The Chromium Authors. All rights reserved. 23f951fab4e50260c90a94b75c8a56912828f1fadrouslan@chromium.org// Use of this source code is governed by a BSD-style license that can be 33f951fab4e50260c90a94b75c8a56912828f1fadrouslan@chromium.org// found in the LICENSE file. 4cd9fa24dde8d32cc1c207db9e96d48f6c6d9b45frouslan@chromium.org 5cd9fa24dde8d32cc1c207db9e96d48f6c6d9b45frouslan@chromium.org#include "base/debug/stack_trace.h" 6cd9fa24dde8d32cc1c207db9e96d48f6c6d9b45frouslan@chromium.org 73f951fab4e50260c90a94b75c8a56912828f1fadrouslan@chromium.org#include <android/log.h> 8cd9fa24dde8d32cc1c207db9e96d48f6c6d9b45frouslan@chromium.org#include <unwind.h> 9cd9fa24dde8d32cc1c207db9e96d48f6c6d9b45frouslan@chromium.org 103f951fab4e50260c90a94b75c8a56912828f1fadrouslan@chromium.org#include "base/debug/proc_maps_linux.h" 113f951fab4e50260c90a94b75c8a56912828f1fadrouslan@chromium.org#include "base/strings/stringprintf.h" 123f951fab4e50260c90a94b75c8a56912828f1fadrouslan@chromium.org#include "base/threading/thread_restrictions.h" 133f951fab4e50260c90a94b75c8a56912828f1fadrouslan@chromium.org 143f951fab4e50260c90a94b75c8a56912828f1fadrouslan@chromium.org#ifdef __LP64__ 153f951fab4e50260c90a94b75c8a56912828f1fadrouslan@chromium.org#define FMT_ADDR "0x%016lx" 163f951fab4e50260c90a94b75c8a56912828f1fadrouslan@chromium.org#else 173f951fab4e50260c90a94b75c8a56912828f1fadrouslan@chromium.org#define FMT_ADDR "0x%08x" 183f951fab4e50260c90a94b75c8a56912828f1fadrouslan@chromium.org#endif 193f951fab4e50260c90a94b75c8a56912828f1fadrouslan@chromium.org 203f951fab4e50260c90a94b75c8a56912828f1fadrouslan@chromium.orgnamespace { 213f951fab4e50260c90a94b75c8a56912828f1fadrouslan@chromium.org 223f951fab4e50260c90a94b75c8a56912828f1fadrouslan@chromium.orgstruct StackCrawlState { 233f951fab4e50260c90a94b75c8a56912828f1fadrouslan@chromium.org StackCrawlState(uintptr_t* frames, size_t max_depth) 243f951fab4e50260c90a94b75c8a56912828f1fadrouslan@chromium.org : frames(frames), 253f951fab4e50260c90a94b75c8a56912828f1fadrouslan@chromium.org frame_count(0), 263f951fab4e50260c90a94b75c8a56912828f1fadrouslan@chromium.org max_depth(max_depth), 273f951fab4e50260c90a94b75c8a56912828f1fadrouslan@chromium.org have_skipped_self(false) {} 283f951fab4e50260c90a94b75c8a56912828f1fadrouslan@chromium.org 293f951fab4e50260c90a94b75c8a56912828f1fadrouslan@chromium.org uintptr_t* frames; 303f951fab4e50260c90a94b75c8a56912828f1fadrouslan@chromium.org size_t frame_count; 313f951fab4e50260c90a94b75c8a56912828f1fadrouslan@chromium.org size_t max_depth; 323f951fab4e50260c90a94b75c8a56912828f1fadrouslan@chromium.org bool have_skipped_self; 333f951fab4e50260c90a94b75c8a56912828f1fadrouslan@chromium.org}; 343f951fab4e50260c90a94b75c8a56912828f1fadrouslan@chromium.org 353f951fab4e50260c90a94b75c8a56912828f1fadrouslan@chromium.org_Unwind_Reason_Code TraceStackFrame(_Unwind_Context* context, void* arg) { 363f951fab4e50260c90a94b75c8a56912828f1fadrouslan@chromium.org StackCrawlState* state = static_cast<StackCrawlState*>(arg); 373f951fab4e50260c90a94b75c8a56912828f1fadrouslan@chromium.org uintptr_t ip = _Unwind_GetIP(context); 383f951fab4e50260c90a94b75c8a56912828f1fadrouslan@chromium.org 393f951fab4e50260c90a94b75c8a56912828f1fadrouslan@chromium.org // The first stack frame is this function itself. Skip it. 403f951fab4e50260c90a94b75c8a56912828f1fadrouslan@chromium.org if (ip != 0 && !state->have_skipped_self) { 413f951fab4e50260c90a94b75c8a56912828f1fadrouslan@chromium.org state->have_skipped_self = true; 423f951fab4e50260c90a94b75c8a56912828f1fadrouslan@chromium.org return _URC_NO_REASON; 433f951fab4e50260c90a94b75c8a56912828f1fadrouslan@chromium.org } 443f951fab4e50260c90a94b75c8a56912828f1fadrouslan@chromium.org 453f951fab4e50260c90a94b75c8a56912828f1fadrouslan@chromium.org state->frames[state->frame_count++] = ip; 463f951fab4e50260c90a94b75c8a56912828f1fadrouslan@chromium.org if (state->frame_count >= state->max_depth) 473f951fab4e50260c90a94b75c8a56912828f1fadrouslan@chromium.org return _URC_END_OF_STACK; 483f951fab4e50260c90a94b75c8a56912828f1fadrouslan@chromium.org return _URC_NO_REASON; 493f951fab4e50260c90a94b75c8a56912828f1fadrouslan@chromium.org} 503f951fab4e50260c90a94b75c8a56912828f1fadrouslan@chromium.org 513f951fab4e50260c90a94b75c8a56912828f1fadrouslan@chromium.org} // namespace 523f951fab4e50260c90a94b75c8a56912828f1fadrouslan@chromium.org 533f951fab4e50260c90a94b75c8a56912828f1fadrouslan@chromium.orgnamespace base { 543f951fab4e50260c90a94b75c8a56912828f1fadrouslan@chromium.orgnamespace debug { 553f951fab4e50260c90a94b75c8a56912828f1fadrouslan@chromium.org 563f951fab4e50260c90a94b75c8a56912828f1fadrouslan@chromium.orgbool EnableInProcessStackDumping() { 573f951fab4e50260c90a94b75c8a56912828f1fadrouslan@chromium.org // When running in an application, our code typically expects SIGPIPE 583f951fab4e50260c90a94b75c8a56912828f1fadrouslan@chromium.org // to be ignored. Therefore, when testing that same code, it should run 593f951fab4e50260c90a94b75c8a56912828f1fadrouslan@chromium.org // with SIGPIPE ignored as well. 603f951fab4e50260c90a94b75c8a56912828f1fadrouslan@chromium.org // TODO(phajdan.jr): De-duplicate this SIGPIPE code. 613f951fab4e50260c90a94b75c8a56912828f1fadrouslan@chromium.org struct sigaction action; 623f951fab4e50260c90a94b75c8a56912828f1fadrouslan@chromium.org memset(&action, 0, sizeof(action)); 633f951fab4e50260c90a94b75c8a56912828f1fadrouslan@chromium.org action.sa_handler = SIG_IGN; 643f951fab4e50260c90a94b75c8a56912828f1fadrouslan@chromium.org sigemptyset(&action.sa_mask); 653f951fab4e50260c90a94b75c8a56912828f1fadrouslan@chromium.org return (sigaction(SIGPIPE, &action, NULL) == 0); 663f951fab4e50260c90a94b75c8a56912828f1fadrouslan@chromium.org} 673f951fab4e50260c90a94b75c8a56912828f1fadrouslan@chromium.org 683f951fab4e50260c90a94b75c8a56912828f1fadrouslan@chromium.orgStackTrace::StackTrace() { 693f951fab4e50260c90a94b75c8a56912828f1fadrouslan@chromium.org StackCrawlState state(reinterpret_cast<uintptr_t*>(trace_), kMaxTraces); 703f951fab4e50260c90a94b75c8a56912828f1fadrouslan@chromium.org _Unwind_Backtrace(&TraceStackFrame, &state); 713f951fab4e50260c90a94b75c8a56912828f1fadrouslan@chromium.org count_ = state.frame_count; 723f951fab4e50260c90a94b75c8a56912828f1fadrouslan@chromium.org} 733f951fab4e50260c90a94b75c8a56912828f1fadrouslan@chromium.org 743f951fab4e50260c90a94b75c8a56912828f1fadrouslan@chromium.orgvoid StackTrace::Print() const { 753f951fab4e50260c90a94b75c8a56912828f1fadrouslan@chromium.org std::string backtrace = ToString(); 763f951fab4e50260c90a94b75c8a56912828f1fadrouslan@chromium.org __android_log_write(ANDROID_LOG_ERROR, "chromium", backtrace.c_str()); 773f951fab4e50260c90a94b75c8a56912828f1fadrouslan@chromium.org} 783f951fab4e50260c90a94b75c8a56912828f1fadrouslan@chromium.org 793f951fab4e50260c90a94b75c8a56912828f1fadrouslan@chromium.org// NOTE: Native libraries in APKs are stripped before installing. Print out the 803f951fab4e50260c90a94b75c8a56912828f1fadrouslan@chromium.org// relocatable address and library names so host computers can use tools to 813f951fab4e50260c90a94b75c8a56912828f1fadrouslan@chromium.org// symbolize and demangle (e.g., addr2line, c++filt). 823f951fab4e50260c90a94b75c8a56912828f1fadrouslan@chromium.orgvoid StackTrace::OutputToStream(std::ostream* os) const { 833f951fab4e50260c90a94b75c8a56912828f1fadrouslan@chromium.org std::string proc_maps; 843f951fab4e50260c90a94b75c8a56912828f1fadrouslan@chromium.org std::vector<MappedMemoryRegion> regions; 853f951fab4e50260c90a94b75c8a56912828f1fadrouslan@chromium.org // Allow IO to read /proc/self/maps. Reading this file doesn't hit the disk 863f951fab4e50260c90a94b75c8a56912828f1fadrouslan@chromium.org // since it lives in procfs, and this is currently used to print a stack trace 873f951fab4e50260c90a94b75c8a56912828f1fadrouslan@chromium.org // on fatal log messages in debug builds only. If the restriction is enabled 883f951fab4e50260c90a94b75c8a56912828f1fadrouslan@chromium.org // then it will recursively trigger fatal failures when this enters on the 893f951fab4e50260c90a94b75c8a56912828f1fadrouslan@chromium.org // UI thread. 903f951fab4e50260c90a94b75c8a56912828f1fadrouslan@chromium.org base::ThreadRestrictions::ScopedAllowIO allow_io; 913f951fab4e50260c90a94b75c8a56912828f1fadrouslan@chromium.org if (!ReadProcMaps(&proc_maps)) { 923f951fab4e50260c90a94b75c8a56912828f1fadrouslan@chromium.org __android_log_write( 933f951fab4e50260c90a94b75c8a56912828f1fadrouslan@chromium.org ANDROID_LOG_ERROR, "chromium", "Failed to read /proc/self/maps"); 943f951fab4e50260c90a94b75c8a56912828f1fadrouslan@chromium.org } else if (!ParseProcMaps(proc_maps, ®ions)) { 953f951fab4e50260c90a94b75c8a56912828f1fadrouslan@chromium.org __android_log_write( 963f951fab4e50260c90a94b75c8a56912828f1fadrouslan@chromium.org ANDROID_LOG_ERROR, "chromium", "Failed to parse /proc/self/maps"); 973f951fab4e50260c90a94b75c8a56912828f1fadrouslan@chromium.org } 983f951fab4e50260c90a94b75c8a56912828f1fadrouslan@chromium.org 993f951fab4e50260c90a94b75c8a56912828f1fadrouslan@chromium.org for (size_t i = 0; i < count_; ++i) { 1003f951fab4e50260c90a94b75c8a56912828f1fadrouslan@chromium.org // Subtract one as return address of function may be in the next 1013f951fab4e50260c90a94b75c8a56912828f1fadrouslan@chromium.org // function when a function is annotated as noreturn. 1023f951fab4e50260c90a94b75c8a56912828f1fadrouslan@chromium.org uintptr_t address = reinterpret_cast<uintptr_t>(trace_[i]) - 1; 1033f951fab4e50260c90a94b75c8a56912828f1fadrouslan@chromium.org 1043f951fab4e50260c90a94b75c8a56912828f1fadrouslan@chromium.org std::vector<MappedMemoryRegion>::iterator iter = regions.begin(); 1053f951fab4e50260c90a94b75c8a56912828f1fadrouslan@chromium.org while (iter != regions.end()) { 1063f951fab4e50260c90a94b75c8a56912828f1fadrouslan@chromium.org if (address >= iter->start && address < iter->end && 1073f951fab4e50260c90a94b75c8a56912828f1fadrouslan@chromium.org !iter->path.empty()) { 1083f951fab4e50260c90a94b75c8a56912828f1fadrouslan@chromium.org break; 1093f951fab4e50260c90a94b75c8a56912828f1fadrouslan@chromium.org } 1103f951fab4e50260c90a94b75c8a56912828f1fadrouslan@chromium.org ++iter; 1113f951fab4e50260c90a94b75c8a56912828f1fadrouslan@chromium.org } 1123f951fab4e50260c90a94b75c8a56912828f1fadrouslan@chromium.org 1133f951fab4e50260c90a94b75c8a56912828f1fadrouslan@chromium.org *os << base::StringPrintf("#%02zd " FMT_ADDR " ", i, address); 1143f951fab4e50260c90a94b75c8a56912828f1fadrouslan@chromium.org 1153f951fab4e50260c90a94b75c8a56912828f1fadrouslan@chromium.org if (iter != regions.end()) { 1163f951fab4e50260c90a94b75c8a56912828f1fadrouslan@chromium.org uintptr_t rel_pc = address - iter->start + iter->offset; 1173f951fab4e50260c90a94b75c8a56912828f1fadrouslan@chromium.org const char* path = iter->path.c_str(); 1183f951fab4e50260c90a94b75c8a56912828f1fadrouslan@chromium.org *os << base::StringPrintf("%s+" FMT_ADDR, path, rel_pc); 1193f951fab4e50260c90a94b75c8a56912828f1fadrouslan@chromium.org } else { 1203f951fab4e50260c90a94b75c8a56912828f1fadrouslan@chromium.org *os << "<unknown>"; 1213f951fab4e50260c90a94b75c8a56912828f1fadrouslan@chromium.org } 1223f951fab4e50260c90a94b75c8a56912828f1fadrouslan@chromium.org 1233f951fab4e50260c90a94b75c8a56912828f1fadrouslan@chromium.org *os << "\n"; 1243f951fab4e50260c90a94b75c8a56912828f1fadrouslan@chromium.org } 1253f951fab4e50260c90a94b75c8a56912828f1fadrouslan@chromium.org} 1263f951fab4e50260c90a94b75c8a56912828f1fadrouslan@chromium.org 1273f951fab4e50260c90a94b75c8a56912828f1fadrouslan@chromium.org} // namespace debug 1283f951fab4e50260c90a94b75c8a56912828f1fadrouslan@chromium.org} // namespace base 1293f951fab4e50260c90a94b75c8a56912828f1fadrouslan@chromium.org