LCOV - app.info - toolkit/crashreporter/google-breakpad/src/client/linux/handler/exception_handler.cc

LCOV - code coverage report
| Current view: | directory - toolkit/crashreporter/google-breakpad/src/client/linux/handler - exception_handler.cc (source / functions) |  | Found | Hit | Coverage |
| Test: | app.info | Lines: | 189 | 60 | 31.7 %
| Date: | 2012-04-21 | Functions: | 23 | 7 | 30.4 %

           1                 : // Copyright (c) 2010 Google Inc.
           2                 : // All rights reserved.
           3                 : //
           4                 : // Redistribution and use in source and binary forms, with or without
           5                 : // modification, are permitted provided that the following conditions are
           6                 : // met:
           7                 : //
           8                 : //     * Redistributions of source code must retain the above copyright
           9                 : // notice, this list of conditions and the following disclaimer.
          10                 : //     * Redistributions in binary form must reproduce the above
          11                 : // copyright notice, this list of conditions and the following disclaimer
          12                 : // in the documentation and/or other materials provided with the
          13                 : // distribution.
          14                 : //     * Neither the name of Google Inc. nor the names of its
          15                 : // contributors may be used to endorse or promote products derived from
          16                 : // this software without specific prior written permission.
          17                 : //
          18                 : // THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
          19                 : // "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
          20                 : // LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
          21                 : // A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
          22                 : // OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
          23                 : // SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
          24                 : // LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
          25                 : // DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
          26                 : // THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
          27                 : // (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
          28                 : // OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
          29                 :
          30                 : // The ExceptionHandler object installs signal handlers for a number of
          31                 : // signals. We rely on the signal handler running on the thread which crashed
          32                 : // in order to identify it. This is true of the synchronous signals (SEGV etc),
          33                 : // but not true of ABRT. Thus, if you send ABRT to yourself in a program which
          34                 : // uses ExceptionHandler, you need to use tgkill to direct it to the current
          35                 : // thread.
          36                 : //
          37                 : // The signal flow looks like this:
          38                 : //
          39                 : //   SignalHandler (uses a global stack of ExceptionHandler objects to find
          40                 : //        |         one to handle the signal. If the first rejects it, try
          41                 : //        |         the second etc...)
          42                 : //        V
          43                 : //   HandleSignal ----------------------------| (clones a new process which
          44                 : //        |                                   |  shares an address space with
          45                 : //   (wait for cloned                         |  the crashed process. This
          46                 : //     process)                               |  allows us to ptrace the crashed
          47                 : //        |                                   |  process)
          48                 : //        V                                   V
          49                 : //   (set signal handler to             ThreadEntry (static function to bounce
          50                 : //    SIG_DFL and rethrow,                    |      back into the object)
          51                 : //    killing the crashed                     |
          52                 : //    process)                                V
          53                 : //                                          DoDump  (writes minidump)
          54                 : //                                            |
          55                 : //                                            V
          56                 : //                                         sys_exit
          57                 : //
          58                 :
          59                 : // This code is a little fragmented. Different functions of the ExceptionHandler
          60                 : // class run in a number of different contexts. Some of them run in a normal
          61                 : // context and are easy to code, others run in a compromised context and the
          62                 : // restrictions at the top of minidump_writer.cc apply: no libc and use the
          63                 : // alternative malloc. Each function should have comment above it detailing the
          64                 : // context which it runs in.
          65                 :
          66                 : #include "client/linux/handler/exception_handler.h"
          67                 :
          68                 : #include <errno.h>
          69                 : #include <fcntl.h>
          70                 : #include <linux/limits.h>
          71                 : #include <sched.h>
          72                 : #include <signal.h>
          73                 : #include <stdio.h>
          74                 : #include <sys/mman.h>
          75                 : #include <sys/prctl.h>
          76                 : #if !defined(__ANDROID__)
          77                 : #include <sys/signal.h>
          78                 : #endif
          79                 : #include <sys/syscall.h>
          80                 : #if !defined(__ANDROID__)
          81                 : #include <sys/ucontext.h>
          82                 : #include <sys/user.h>
          83                 : #endif
          84                 : #include <sys/wait.h>
          85                 : #if !defined(__ANDROID__)
          86                 : #include <ucontext.h>
          87                 : #endif
          88                 : #include <unistd.h>
          89                 :
          90                 : #include <algorithm>
          91                 : #include <utility>
          92                 : #include <vector>
          93                 :
          94                 : #include "common/linux/linux_libc_support.h"
          95                 : #include "common/linux/linux_syscall_support.h"
          96                 : #include "common/memory.h"
          97                 : #include "client/linux/minidump_writer/linux_dumper.h"
          98                 : #include "client/linux/minidump_writer/minidump_writer.h"
          99                 : #include "common/linux/guid_creator.h"
         100                 : #include "common/linux/eintr_wrapper.h"
         101                 :
         102                 : #include "linux/sched.h"
         103                 :
         104                 : #ifndef PR_SET_PTRACER
         105                 : #define PR_SET_PTRACER 0x59616d61
         106                 : #endif
         107                 :
         108                 : // A wrapper for the tgkill syscall: send a signal to a specific thread.
         109               0 : static int tgkill(pid_t tgid, pid_t tid, int sig) {
         110               0 :   return syscall(__NR_tgkill, tgid, tid, sig);
         111                 :   return 0;
         112                 : }
         113                 :
         114                 : namespace google_breakpad {
         115                 :
         116                 : // The list of signals which we consider to be crashes. The default action for
         117                 : // all these signals must be Core (see man 7 signal) because we rethrow the
         118                 : // signal after handling it and expect that it'll be fatal.
         119                 : static const int kExceptionSignals[] = {
         120                 :   SIGSEGV, SIGABRT, SIGFPE, SIGILL, SIGBUS, -1
         121                 : };
         122                 :
         123                 : // We can stack multiple exception handlers. In that case, this is the global
         124                 : // which holds the stack.
         125                 : std::vector<ExceptionHandler*>* ExceptionHandler::handler_stack_ = NULL;
         126                 : unsigned ExceptionHandler::handler_stack_index_ = 0;
         127                 : pthread_mutex_t ExceptionHandler::handler_stack_mutex_ =
         128                 :     PTHREAD_MUTEX_INITIALIZER;
         129                 :
         130                 : // Runs before crashing: normal context.
         131            1387 : ExceptionHandler::ExceptionHandler(const std::string &dump_path,
         132                 :                                    FilterCallback filter,
         133                 :                                    MinidumpCallback callback,
         134                 :                                    void *callback_context,
         135                 :                                    bool install_handler)
         136                 :   : filter_(filter),
         137                 :     callback_(callback),
         138                 :     callback_context_(callback_context),
         139            1387 :     handler_installed_(install_handler)
         140                 : {
         141            1387 :   Init(dump_path, -1);
         142            1387 : }
         143                 :
         144               1 : ExceptionHandler::ExceptionHandler(const std::string &dump_path,
         145                 :                                    FilterCallback filter,
         146                 :                                    MinidumpCallback callback,
         147                 :                                    void* callback_context,
         148                 :                                    bool install_handler,
         149                 :                                    const int server_fd)
         150                 :   : filter_(filter),
         151                 :     callback_(callback),
         152                 :     callback_context_(callback_context),
         153               1 :     handler_installed_(install_handler)
         154                 : {
         155               1 :   Init(dump_path, server_fd);
         156               1 : }
         157                 :
         158                 : // Runs before crashing: normal context.
         159            2730 : ExceptionHandler::~ExceptionHandler() {
         160            1365 :   UninstallHandlers();
         161            1365 : }
         162                 :
         163            1388 : void ExceptionHandler::Init(const std::string &dump_path,
         164                 :                             const int server_fd)
         165                 : {
         166            1388 :   crash_handler_ = NULL;
         167            1388 :   if (0 <= server_fd)
         168                 :     crash_generation_client_
         169               1 :       .reset(CrashGenerationClient::TryCreate(server_fd));
         170                 :
         171            1388 :   if (handler_installed_)
         172            1388 :     InstallHandlers();
         173                 :
         174            1388 :   if (!IsOutOfProcess())
         175            1387 :     set_dump_path(dump_path);
         176                 :
         177            1388 :   pthread_mutex_lock(&handler_stack_mutex_);
         178            1388 :   if (handler_stack_ == NULL)
         179            1388 :     handler_stack_ = new std::vector<ExceptionHandler *>;
         180            1388 :   handler_stack_->push_back(this);
         181            1388 :   pthread_mutex_unlock(&handler_stack_mutex_);
         182            1388 : }
         183                 :
         184                 : // Runs before crashing: normal context.
         185            1388 : bool ExceptionHandler::InstallHandlers() {
         186                 :   // We run the signal handlers on an alternative stack because we might have
         187                 :   // crashed because of a stack overflow.
         188                 :
         189                 :   // We use this value rather than SIGSTKSZ because we would end up overrunning
         190                 :   // such a small stack.
         191                 :   static const unsigned kSigStackSize = 8192;
         192                 :
         193                 :   stack_t stack;
         194                 :   // Only set an alternative stack if there isn't already one, or if the current
         195                 :   // one is too small.
         196            1388 :   if (sys_sigaltstack(NULL, &stack) == -1 || !stack.ss_sp ||
         197                 :       stack.ss_size < kSigStackSize) {
         198            1388 :     memset(&stack, 0, sizeof(stack));
         199            1388 :     stack.ss_sp = malloc(kSigStackSize);
         200            1388 :     stack.ss_size = kSigStackSize;
         201                 :
         202            1388 :     if (sys_sigaltstack(&stack, NULL) == -1)
         203               0 :       return false;
         204                 :   }
         205                 :
         206                 :   struct sigaction sa;
         207            1388 :   memset(&sa, 0, sizeof(sa));
         208            1388 :   sigemptyset(&sa.sa_mask);
         209                 :
         210                 :   // mask all exception signals when we're handling one of them.
         211            8328 :   for (unsigned i = 0; kExceptionSignals[i] != -1; ++i)
         212            6940 :     sigaddset(&sa.sa_mask, kExceptionSignals[i]);
         213                 :
         214            1388 :   sa.sa_sigaction = SignalHandler;
         215            1388 :   sa.sa_flags = SA_ONSTACK | SA_SIGINFO;
         216                 :
         217            8328 :   for (unsigned i = 0; kExceptionSignals[i] != -1; ++i) {
         218            6940 :     struct sigaction* old = new struct sigaction;
         219            6940 :     if (sigaction(kExceptionSignals[i], &sa, old) == -1)
         220               0 :       return false;
         221            6940 :     old_handlers_.push_back(std::make_pair(kExceptionSignals[i], old));
         222                 :   }
         223            1388 :   return true;
         224                 : }
         225                 :
         226                 : // Runs before crashing: normal context.
         227            1365 : void ExceptionHandler::UninstallHandlers() {
         228            8190 :   for (unsigned i = 0; i < old_handlers_.size(); ++i) {
         229                 :     struct sigaction *action =
         230            6825 :         reinterpret_cast<struct sigaction*>(old_handlers_[i].second);
         231            6825 :     sigaction(old_handlers_[i].first, action, NULL);
         232                 :     delete action;
         233                 :   }
         234            1365 :   pthread_mutex_lock(&handler_stack_mutex_);
         235                 :   std::vector<ExceptionHandler*>::iterator handler =
         236            1365 :       std::find(handler_stack_->begin(), handler_stack_->end(), this);
         237            1365 :   handler_stack_->erase(handler);
         238            1365 :   pthread_mutex_unlock(&handler_stack_mutex_);
         239            1365 :   old_handlers_.clear();
         240            1365 : }
         241                 :
         242                 : // Runs before crashing: normal context.
         243            2752 : void ExceptionHandler::UpdateNextID() {
         244                 :   GUID guid;
         245                 :   char guid_str[kGUIDStringLength + 1];
         246            2752 :   if (CreateGUID(&guid) && GUIDToString(&guid, guid_str, sizeof(guid_str))) {
         247            2752 :     next_minidump_id_ = guid_str;
         248            2752 :     next_minidump_id_c_ = next_minidump_id_.c_str();
         249                 :
         250                 :     char minidump_path[PATH_MAX];
         251                 :     snprintf(minidump_path, sizeof(minidump_path), "%s/%s.dmp",
         252                 :              dump_path_c_,
         253            2752 :              guid_str);
         254                 :
         255            2752 :     next_minidump_path_ = minidump_path;
         256            2752 :     next_minidump_path_c_ = next_minidump_path_.c_str();
         257                 :   }
         258            2752 : }
         259                 :
         260                 : // void ExceptionHandler::set_crash_handler(HandlerCallback callback) {
         261                 : //   crash_handler_ = callback;
         262                 : // }
         263                 :
         264                 : // This function runs in a compromised context: see the top of the file.
         265                 : // Runs on the crashing thread.
         266                 : // static
         267               0 : void ExceptionHandler::SignalHandler(int sig, siginfo_t* info, void* uc) {
         268                 :   // All the exception signals are blocked at this point.
         269               0 :   pthread_mutex_lock(&handler_stack_mutex_);
         270                 :
         271               0 :   if (!handler_stack_->size()) {
         272               0 :     pthread_mutex_unlock(&handler_stack_mutex_);
         273                 :     return;
         274                 :   }
         275                 :
         276               0 :   for (int i = handler_stack_->size() - 1; i >= 0; --i) {
         277               0 :     if ((*handler_stack_)[i]->HandleSignal(sig, info, uc)) {
         278                 :       // successfully handled: We are in an invalid state since an exception
         279                 :       // signal has been delivered. We don't call the exit handlers because
         280                 :       // they could end up corrupting on-disk state.
         281               0 :       break;
         282                 :     }
         283                 :   }
         284                 :
         285               0 :   pthread_mutex_unlock(&handler_stack_mutex_);
         286                 :
         287                 :   // Terminate ourselves with the same signal so that our parent knows that we
         288                 :   // crashed. The default action for all the signals which we catch is Core, so
         289                 :   // this is the end of us.
         290               0 :   signal(sig, SIG_DFL);
         291                 :
         292                 :   // TODO(markus): mask signal and return to caller
         293               0 :   tgkill(getpid(), syscall(__NR_gettid), sig);
         294               0 :   _exit(1);
         295                 :
         296                 :   // not reached.
         297                 : }
         298                 :
         299                 : struct ThreadArgument {
         300                 :   pid_t pid;  // the crashing process
         301                 :   ExceptionHandler* handler;
         302                 :   const void* context;  // a CrashContext structure
         303                 :   size_t context_size;
         304                 : };
         305                 :
         306                 : // This is the entry function for the cloned process. We are in a compromised
         307                 : // context here: see the top of the file.
         308                 : // static
         309               0 : int ExceptionHandler::ThreadEntry(void *arg) {
         310               0 :   const ThreadArgument *thread_arg = reinterpret_cast<ThreadArgument*>(arg);
         311                 :
         312                 :   // Block here until the crashing process unblocks us when
         313                 :   // we're allowed to use ptrace
         314               0 :   thread_arg->handler->WaitForContinueSignal();
         315                 :
         316                 :   return thread_arg->handler->DoDump(thread_arg->pid, thread_arg->context,
         317               0 :                                      thread_arg->context_size) == false;
         318                 : }
         319                 :
         320                 : // This function runs in a compromised context: see the top of the file.
         321                 : // Runs on the crashing thread.
         322               0 : bool ExceptionHandler::HandleSignal(int sig, siginfo_t* info, void* uc) {
         323               0 :   if (filter_ && !filter_(callback_context_))
         324               0 :     return false;
         325                 :
         326                 :   // Allow ourselves to be dumped.
         327               0 :   sys_prctl(PR_SET_DUMPABLE, 1);
         328                 :   CrashContext context;
         329               0 :   memcpy(&context.siginfo, info, sizeof(siginfo_t));
         330               0 :   memcpy(&context.context, uc, sizeof(struct ucontext));
         331                 : #if !defined(__ARM_EABI__)
         332                 :   // FP state is not part of user ABI on ARM Linux.
         333               0 :   struct ucontext *uc_ptr = (struct ucontext*)uc;
         334               0 :   if (uc_ptr->uc_mcontext.fpregs) {
         335                 :     memcpy(&context.float_state,
         336                 :            uc_ptr->uc_mcontext.fpregs,
         337               0 :            sizeof(context.float_state));
         338                 :   }
         339                 : #endif
         340               0 :   context.tid = syscall(__NR_gettid);
         341               0 :   if (crash_handler_ != NULL) {
         342               0 :     if (crash_handler_(&context, sizeof(context),
         343               0 :                        callback_context_)) {
         344               0 :       return true;
         345                 :     }
         346                 :   }
         347               0 :   return GenerateDump(&context);
         348                 : }
         349                 :
         350                 : // This function may run in a compromised context: see the top of the file.
         351               0 : bool ExceptionHandler::GenerateDump(CrashContext *context) {
         352               0 :   if (IsOutOfProcess())
         353               0 :     return crash_generation_client_->RequestDump(context, sizeof(*context));
         354                 :
         355                 :   static const unsigned kChildStackSize = 8000;
         356               0 :   PageAllocator allocator;
         357               0 :   uint8_t* stack = (uint8_t*) allocator.Alloc(kChildStackSize);
         358               0 :   if (!stack)
         359               0 :     return false;
         360                 :   // clone() needs the top-most address. (scrub just to be safe)
         361               0 :   stack += kChildStackSize;
         362               0 :   my_memset(stack - 16, 0, 16);
         363                 :
         364                 :   ThreadArgument thread_arg;
         365               0 :   thread_arg.handler = this;
         366               0 :   thread_arg.pid = getpid();
         367               0 :   thread_arg.context = context;
         368               0 :   thread_arg.context_size = sizeof(*context);
         369                 :
         370                 :   // We need to explicitly enable ptrace of parent processes on some
         371                 :   // kernels, but we need to know the PID of the cloned process before we
         372                 :   // can do this. Create a pipe here which we can use to block the
         373                 :   // cloned process after creating it, until we have explicitly enabled ptrace
         374               0 :   if(sys_pipe(fdes) == -1) {
         375                 :     // Creating the pipe failed. We'll log an error but carry on anyway,
         376                 :     // as we'll probably still get a useful crash report. All that will happen
         377                 :     // is the write() and read() calls will fail with EBADF
         378                 :     static const char no_pipe_msg[] = "ExceptionHandler::GenerateDump \
         379                 :                                        sys_pipe failed:";
         380               0 :     sys_write(2, no_pipe_msg, sizeof(no_pipe_msg) - 1);
         381               0 :     sys_write(2, strerror(errno), strlen(strerror(errno)));
         382               0 :     sys_write(2, "\n", 1);
         383                 :   }
         384                 :
         385                 :   const pid_t child = sys_clone(
         386                 :       ThreadEntry, stack, CLONE_FILES | CLONE_FS | CLONE_UNTRACED,
         387               0 :       &thread_arg, NULL, NULL, NULL);
         388                 :   int r, status;
         389                 :   // Allow the child to ptrace us
         390               0 :   prctl(PR_SET_PTRACER, child, 0, 0, 0);
         391               0 :   SendContinueSignalToChild();
         392               0 :   do {
         393               0 :     r = sys_waitpid(child, &status, __WALL);
         394               0 :   } while (r == -1 && errno == EINTR);
         395                 :
         396               0 :   sys_close(fdes[0]);
         397               0 :   sys_close(fdes[1]);
         398                 :
         399               0 :   if (r == -1) {
         400                 :     static const char msg[] = "ExceptionHandler::GenerateDump waitpid failed:";
         401               0 :     sys_write(2, msg, sizeof(msg) - 1);
         402               0 :     sys_write(2, strerror(errno), strlen(strerror(errno)));
         403               0 :     sys_write(2, "\n", 1);
         404                 :   }
         405                 :
         406               0 :   bool success = r != -1 && WIFEXITED(status) && WEXITSTATUS(status) == 0;
         407                 :
         408               0 :   if (callback_)
         409                 :     success = callback_(dump_path_c_, next_minidump_id_c_,
         410               0 :                         callback_context_, success);
         411                 :
         412               0 :   return success;
         413                 : }
         414                 :
         415                 : // This function runs in a compromised context: see the top of the file.
         416               0 : void ExceptionHandler::SendContinueSignalToChild() {
         417                 :   static const char okToContinueMessage = 'a';
         418                 :   int r;
         419               0 :   r = HANDLE_EINTR(sys_write(fdes[1], &okToContinueMessage, sizeof(char)));
         420               0 :   if(r == -1) {
         421                 :     static const char msg[] = "ExceptionHandler::SendContinueSignalToChild \
         422                 :                                sys_write failed:";
         423               0 :     sys_write(2, msg, sizeof(msg) - 1);
         424               0 :     sys_write(2, strerror(errno), strlen(strerror(errno)));
         425               0 :     sys_write(2, "\n", 1);
         426                 :   }
         427               0 : }
         428                 :
         429                 : // This function runs in a compromised context: see the top of the file.
         430                 : // Runs on the cloned process.
         431               0 : void ExceptionHandler::WaitForContinueSignal() {
         432                 :   int r;
         433                 :   char receivedMessage;
         434               0 :   r = HANDLE_EINTR(sys_read(fdes[0], &receivedMessage, sizeof(char)));
         435               0 :   if(r == -1) {
         436                 :     static const char msg[] = "ExceptionHandler::WaitForContinueSignal \
         437                 :                                sys_read failed:";
         438               0 :     sys_write(2, msg, sizeof(msg) - 1);
         439               0 :     sys_write(2, strerror(errno), strlen(strerror(errno)));
         440               0 :     sys_write(2, "\n", 1);
         441                 :   }
         442               0 : }
         443                 :
         444                 : // This function runs in a compromised context: see the top of the file.
         445                 : // Runs on the cloned process.
         446               0 : bool ExceptionHandler::DoDump(pid_t crashing_process, const void* context,
         447                 :                               size_t context_size) {
         448                 :   return google_breakpad::WriteMinidump(next_minidump_path_c_,
         449                 :                                         crashing_process,
         450                 :                                         context,
         451                 :                                         context_size,
         452                 :                                         mapping_info_,
         453               0 :                                         app_memory_info_);
         454                 : }
         455                 :
         456                 : // static
         457               0 : bool ExceptionHandler::WriteMinidump(const std::string &dump_path,
         458                 :                                      MinidumpCallback callback,
         459                 :                                      void* callback_context) {
         460               0 :   return WriteMinidump(dump_path, false, callback, callback_context);
         461                 : }
         462                 :
         463                 : // static
         464               0 : bool ExceptionHandler::WriteMinidump(const std::string &dump_path,
         465                 :                                      bool write_exception_stream,
         466                 :                                      MinidumpCallback callback,
         467                 :                                      void* callback_context) {
         468               0 :   ExceptionHandler eh(dump_path, NULL, callback, callback_context, false);
         469               0 :   return eh.WriteMinidump(write_exception_stream);
         470                 : }
         471                 :
         472               0 : bool ExceptionHandler::WriteMinidump() {
         473               0 :   return WriteMinidump(false);
         474                 : }
         475                 :
         476               0 : bool ExceptionHandler::WriteMinidump(bool write_exception_stream) {
         477                 : #if !defined(__ARM_EABI__)
         478                 :   // Allow ourselves to be dumped.
         479               0 :   sys_prctl(PR_SET_DUMPABLE, 1);
         480                 :
         481                 :   CrashContext context;
         482               0 :   int getcontext_result = getcontext(&context.context);
         483               0 :   if (getcontext_result)
         484               0 :     return false;
         485                 :   memcpy(&context.float_state, context.context.uc_mcontext.fpregs,
         486               0 :          sizeof(context.float_state));
         487               0 :   context.tid = sys_gettid();
         488                 :
         489               0 :   if (write_exception_stream) {
         490               0 :     memset(&context.siginfo, 0, sizeof(context.siginfo));
         491               0 :     context.siginfo.si_signo = SIGSTOP;
         492                 : #if defined(__i386)
         493                 :     context.siginfo.si_addr =
         494               0 :       reinterpret_cast<void*>(context.context.uc_mcontext.gregs[REG_EIP]);
         495                 : #elif defined(__x86_64)
         496                 :     context.siginfo.si_addr =
         497                 :       reinterpret_cast<void*>(context.context.uc_mcontext.gregs[REG_RIP]);
         498                 : #elif defined(__ARMEL__)
         499                 :     context.siginfo.si_addr =
         500                 :       reinterpret_cast<void*>(context.context.uc_mcontext.arm_ip);
         501                 : #endif
         502                 :   }
         503                 :
         504               0 :   bool success = GenerateDump(&context);
         505               0 :   UpdateNextID();
         506               0 :   return success;
         507                 : #else
         508                 :   return false;
         509                 : #endif  // !defined(__ARM_EABI__)
         510                 : }
         511                 :
         512                 : // static
         513               0 : bool ExceptionHandler::WriteMinidumpForChild(pid_t child,
         514                 :                                              pid_t child_blamed_thread,
         515                 :                                              const std::string &dump_path,
         516                 :                                              MinidumpCallback callback,
         517                 :                                              void *callback_context)
         518                 : {
         519                 :   // This function is not run in a compromised context.
         520               0 :   ExceptionHandler eh(dump_path, NULL, NULL, NULL, false);
         521               0 :   if (!google_breakpad::WriteMinidump(eh.next_minidump_path_c_,
         522                 :                                       child,
         523               0 :                                       child_blamed_thread))
         524               0 :       return false;
         525                 :
         526                 :   return callback ? callback(eh.dump_path_c_, eh.next_minidump_id_c_,
         527               0 :                              callback_context, true) : true;
         528                 : }
         529                 :
         530               0 : void ExceptionHandler::AddMappingInfo(const std::string& name,
         531                 :                                       const u_int8_t identifier[sizeof(MDGUID)],
         532                 :                                       uintptr_t start_address,
         533                 :                                       size_t mapping_size,
         534                 :                                       size_t file_offset) {
         535                 :    MappingInfo info;
         536               0 :    info.start_addr = start_address;
         537               0 :    info.size = mapping_size;
         538               0 :    info.offset = file_offset;
         539               0 :    strncpy(info.name, name.c_str(), std::min(name.size() + 1, sizeof(info)));
         540                 :
         541               0 :    std::pair<MappingInfo, u_int8_t[sizeof(MDGUID)]> mapping;
         542               0 :    mapping.first = info;
         543               0 :    memcpy(mapping.second, identifier, sizeof(MDGUID));
         544               0 :    mapping_info_.push_back(mapping);
         545               0 : }
         546                 :
         547               0 : void ExceptionHandler::RegisterAppMemory(void *ptr, size_t length) {
         548               0 :   app_memory_info_.push_back(AppMemory(ptr, length));
         549               0 : }
         550                 :
         551               0 : void ExceptionHandler::UnregisterAppMemory(void *ptr) {
         552               0 :   for (AppMemoryList::iterator iter = app_memory_info_.begin();
         553               0 :        iter != app_memory_info_.end();
         554                 :        ++iter) {
         555               0 :     if (iter->ptr == ptr) {
         556               0 :       app_memory_info_.erase(iter);
         557               0 :       return;
         558                 :     }
         559                 :   }
         560                 : }
         561                 :
         562                 : }  // namespace google_breakpad

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