diff options
Diffstat (limited to 'src/client/linux/handler/minidump_generator.cc')
| -rw-r--r-- | src/client/linux/handler/minidump_generator.cc | 816 |
1 files changed, 0 insertions, 816 deletions
diff --git a/src/client/linux/handler/minidump_generator.cc b/src/client/linux/handler/minidump_generator.cc deleted file mode 100644 index d172092c..00000000 --- a/src/client/linux/handler/minidump_generator.cc +++ /dev/null @@ -1,816 +0,0 @@ -// Copyright (c) 2006, Google Inc. -// All rights reserved. -// -// Author: Li Liu -// -// Redistribution and use in source and binary forms, with or without -// modification, are permitted provided that the following conditions are -// met: -// -// * Redistributions of source code must retain the above copyright -// notice, this list of conditions and the following disclaimer. -// * Redistributions in binary form must reproduce the above -// copyright notice, this list of conditions and the following disclaimer -// in the documentation and/or other materials provided with the -// distribution. -// * Neither the name of Google Inc. nor the names of its -// contributors may be used to endorse or promote products derived from -// this software without specific prior written permission. -// -// THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS -// "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT -// LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR -// A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT -// OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, -// SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT -// LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, -// DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY -// THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT -// (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE -// OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE. - -#include <fcntl.h> -#include <pthread.h> -#include <signal.h> -#include <sys/stat.h> -#include <sys/types.h> -#include <unistd.h> -#include <sys/utsname.h> -#include <sys/wait.h> - -#include <cstdlib> -#include <cstdio> -#include <ctime> -#include <string.h> - -#include "common/linux/file_id.h" -#include "client/linux/handler/linux_thread.h" -#include "client/minidump_file_writer.h" -#include "client/minidump_file_writer-inl.h" -#include "google_breakpad/common/minidump_format.h" -#include "client/linux/handler/minidump_generator.h" - -#ifndef CLONE_UNTRACED -#define CLONE_UNTRACED 0x00800000 -#endif - -// This unnamed namespace contains helper functions. -namespace { - -using namespace google_breakpad; - -// Argument for the writer function. -struct WriterArgument { - MinidumpFileWriter *minidump_writer; - - // Context for the callback. - void *version_context; - - // Pid of the thread who called WriteMinidumpToFile - int requester_pid; - - // The stack bottom of the thread which caused the dump. - // Mainly used to find the thread id of the crashed thread since signal - // handler may not be called in the thread who caused it. - uintptr_t crashed_stack_bottom; - - // Pid of the crashing thread. - int crashed_pid; - - // Signal number when crash happed. Can be 0 if this is a requested dump. - int signo; - - // The ebp of the signal handler frame. Can be zero if this - // is a requested dump. - uintptr_t sighandler_ebp; - - // Signal context when crash happed. Can be NULL if this is a requested dump. - // This is actually an out parameter, but it will be filled in at the start - // of the writer thread. - struct sigcontext *sig_ctx; - - // Used to get information about the threads. - LinuxThread *thread_lister; -}; - -// Holding context information for the callback of finding the crashing thread. -struct FindCrashThreadContext { - const LinuxThread *thread_lister; - uintptr_t crashing_stack_bottom; - int crashing_thread_pid; - - FindCrashThreadContext() : - thread_lister(NULL), - crashing_stack_bottom(0UL), - crashing_thread_pid(-1) { - } -}; - -// Callback for list threads. -// It will compare the stack bottom of the provided thread with the stack -// bottom of the crashed thread, it they are eqaul, this is thread is the one -// who crashed. -bool IsThreadCrashedCallback(const ThreadInfo &thread_info, void *context) { - FindCrashThreadContext *crashing_context = - static_cast<FindCrashThreadContext *>(context); - const LinuxThread *thread_lister = crashing_context->thread_lister; - struct user_regs_struct regs; - if (thread_lister->GetRegisters(thread_info.pid, ®s)) { - uintptr_t last_ebp = regs.ebp; - uintptr_t stack_bottom = thread_lister->GetThreadStackBottom(last_ebp); - if (stack_bottom > last_ebp && - stack_bottom == crashing_context->crashing_stack_bottom) { - // Got it. Stop iteration. - crashing_context->crashing_thread_pid = thread_info.pid; - return false; - } - } - return true; -} - -// Find the crashing thread id. -// This is done based on stack bottom comparing. -int FindCrashingThread(uintptr_t crashing_stack_bottom, - int requester_pid, - const LinuxThread *thread_lister) { - FindCrashThreadContext context; - context.thread_lister = thread_lister; - context.crashing_stack_bottom = crashing_stack_bottom; - CallbackParam<ThreadCallback> callback_param(IsThreadCrashedCallback, - &context); - thread_lister->ListThreads(&callback_param); - return context.crashing_thread_pid; -} - -// Write the thread stack info minidump. -bool WriteThreadStack(uintptr_t last_ebp, - uintptr_t last_esp, - const LinuxThread *thread_lister, - UntypedMDRVA *memory, - MDMemoryDescriptor *loc) { - // Maximum stack size for a thread. - uintptr_t stack_bottom = thread_lister->GetThreadStackBottom(last_ebp); - if (stack_bottom > last_esp) { - int size = stack_bottom - last_esp; - if (size > 0) { - if (!memory->Allocate(size)) - return false; - memory->Copy(reinterpret_cast<void*>(last_esp), size); - loc->start_of_memory_range = 0 | last_esp; - loc->memory = memory->location(); - } - return true; - } - return false; -} - -// Write CPU context based on signal context. -bool WriteContext(MDRawContextX86 *context, const struct sigcontext *sig_ctx, - const DebugRegs *debug_regs) { - assert(sig_ctx != NULL); - context->context_flags = MD_CONTEXT_X86_FULL; - context->gs = sig_ctx->gs; - context->fs = sig_ctx->fs; - context->es = sig_ctx->es; - context->ds = sig_ctx->ds; - context->cs = sig_ctx->cs; - context->ss = sig_ctx->ss; - context->edi = sig_ctx->edi; - context->esi = sig_ctx->esi; - context->ebp = sig_ctx->ebp; - context->esp = sig_ctx->esp; - context->ebx = sig_ctx->ebx; - context->edx = sig_ctx->edx; - context->ecx = sig_ctx->ecx; - context->eax = sig_ctx->eax; - context->eip = sig_ctx->eip; - context->eflags = sig_ctx->eflags; - if (sig_ctx->fpstate != NULL) { - context->context_flags = MD_CONTEXT_X86_FULL | - MD_CONTEXT_X86_FLOATING_POINT; - context->float_save.control_word = sig_ctx->fpstate->cw; - context->float_save.status_word = sig_ctx->fpstate->sw; - context->float_save.tag_word = sig_ctx->fpstate->tag; - context->float_save.error_offset = sig_ctx->fpstate->ipoff; - context->float_save.error_selector = sig_ctx->fpstate->cssel; - context->float_save.data_offset = sig_ctx->fpstate->dataoff; - context->float_save.data_selector = sig_ctx->fpstate->datasel; - memcpy(context->float_save.register_area, sig_ctx->fpstate->_st, - sizeof(context->float_save.register_area)); - } - - if (debug_regs != NULL) { - context->context_flags |= MD_CONTEXT_X86_DEBUG_REGISTERS; - context->dr0 = debug_regs->dr0; - context->dr1 = debug_regs->dr1; - context->dr2 = debug_regs->dr2; - context->dr3 = debug_regs->dr3; - context->dr6 = debug_regs->dr6; - context->dr7 = debug_regs->dr7; - } - return true; -} - -// Write CPU context based on provided registers. -bool WriteContext(MDRawContextX86 *context, - const struct user_regs_struct *regs, - const struct user_fpregs_struct *fp_regs, - const DebugRegs *dbg_regs) { - if (!context || !regs) - return false; - - context->context_flags = MD_CONTEXT_X86_FULL; - - context->cs = regs->xcs; - context->ds = regs->xds; - context->es = regs->xes; - context->fs = regs->xfs; - context->gs = regs->xgs; - context->ss = regs->xss; - context->edi = regs->edi; - context->esi = regs->esi; - context->ebx = regs->ebx; - context->edx = regs->edx; - context->ecx = regs->ecx; - context->eax = regs->eax; - context->ebp = regs->ebp; - context->eip = regs->eip; - context->esp = regs->esp; - context->eflags = regs->eflags; - - if (dbg_regs != NULL) { - context->context_flags |= MD_CONTEXT_X86_DEBUG_REGISTERS; - context->dr0 = dbg_regs->dr0; - context->dr1 = dbg_regs->dr1; - context->dr2 = dbg_regs->dr2; - context->dr3 = dbg_regs->dr3; - context->dr6 = dbg_regs->dr6; - context->dr7 = dbg_regs->dr7; - } - - if (fp_regs != NULL) { - context->context_flags |= MD_CONTEXT_X86_FLOATING_POINT; - context->float_save.control_word = fp_regs->cwd; - context->float_save.status_word = fp_regs->swd; - context->float_save.tag_word = fp_regs->twd; - context->float_save.error_offset = fp_regs->fip; - context->float_save.error_selector = fp_regs->fcs; - context->float_save.data_offset = fp_regs->foo; - context->float_save.data_selector = fp_regs->fos; - context->float_save.data_selector = fp_regs->fos; - - memcpy(context->float_save.register_area, fp_regs->st_space, - sizeof(context->float_save.register_area)); - } - return true; -} - -// Write information about a crashed thread. -// When a thread crash, kernel will write something on the stack for processing -// signal. This makes the current stack not reliable, and our stack walker -// won't figure out the whole call stack for this. So we write the stack at the -// time of the crash into the minidump file, not the current stack. -bool WriteCrashedThreadStream(MinidumpFileWriter *minidump_writer, - const WriterArgument *writer_args, - const ThreadInfo &thread_info, - MDRawThread *thread) { - assert(writer_args->sig_ctx != NULL); - - thread->thread_id = thread_info.pid; - - UntypedMDRVA memory(minidump_writer); - if (!WriteThreadStack(writer_args->sig_ctx->ebp, - writer_args->sig_ctx->esp, - writer_args->thread_lister, - &memory, - &thread->stack)) - return false; - - TypedMDRVA<MDRawContextX86> context(minidump_writer); - if (!context.Allocate()) - return false; - thread->thread_context = context.location(); - memset(context.get(), 0, sizeof(MDRawContextX86)); - return WriteContext(context.get(), writer_args->sig_ctx, NULL); -} - -// Write information about a thread. -// This function only processes thread running normally at the crash. -bool WriteThreadStream(MinidumpFileWriter *minidump_writer, - const LinuxThread *thread_lister, - const ThreadInfo &thread_info, - MDRawThread *thread) { - thread->thread_id = thread_info.pid; - - struct user_regs_struct regs; - memset(®s, 0, sizeof(regs)); - if (!thread_lister->GetRegisters(thread_info.pid, ®s)) { - perror(NULL); - return false; - } - - UntypedMDRVA memory(minidump_writer); - if (!WriteThreadStack(regs.ebp, - regs.esp, - thread_lister, - &memory, - &thread->stack)) - return false; - - struct user_fpregs_struct fp_regs; - DebugRegs dbg_regs; - memset(&fp_regs, 0, sizeof(fp_regs)); - // Get all the registers. - thread_lister->GetFPRegisters(thread_info.pid, &fp_regs); - thread_lister->GetDebugRegisters(thread_info.pid, &dbg_regs); - - // Write context - TypedMDRVA<MDRawContextX86> context(minidump_writer); - if (!context.Allocate()) - return false; - thread->thread_context = context.location(); - memset(context.get(), 0, sizeof(MDRawContextX86)); - return WriteContext(context.get(), ®s, &fp_regs, &dbg_regs); -} - -bool WriteCPUInformation(MDRawSystemInfo *sys_info) { - const char *proc_cpu_path = "/proc/cpuinfo"; - char line[128]; - char vendor_id[13]; - const char vendor_id_name[] = "vendor_id"; - const size_t vendor_id_name_length = sizeof(vendor_id_name) - 1; - - struct CpuInfoEntry { - const char *info_name; - int value; - } cpu_info_table[] = { - { "processor", -1 }, - { "model", 0 }, - { "stepping", 0 }, - { "cpuid level", 0 }, - { NULL, -1 }, - }; - - memset(vendor_id, 0, sizeof(vendor_id)); - - FILE *fp = fopen(proc_cpu_path, "r"); - if (fp != NULL) { - while (fgets(line, sizeof(line), fp)) { - CpuInfoEntry *entry = &cpu_info_table[0]; - while (entry->info_name != NULL) { - if (!strncmp(line, entry->info_name, strlen(entry->info_name))) { - char *value = strchr(line, ':'); - value++; - if (value != NULL) - sscanf(value, " %d", &(entry->value)); - } - entry++; - } - - // special case for vendor_id - if (!strncmp(line, vendor_id_name, vendor_id_name_length)) { - char *value = strchr(line, ':'); - if (value == NULL) - continue; - - value++; - while (*value && isspace(*value)) - value++; - if (*value) { - size_t length = strlen(value); - // we don't want the trailing newline - if (value[length - 1] == '\n') - length--; - // ensure we have space for the value - if (length < sizeof(vendor_id)) - strncpy(vendor_id, value, length); - } - } - } - fclose(fp); - } - - // /proc/cpuinfo contains cpu id, change it into number by adding one. - cpu_info_table[0].value++; - - sys_info->number_of_processors = cpu_info_table[0].value; - sys_info->processor_level = cpu_info_table[3].value; - sys_info->processor_revision = cpu_info_table[1].value << 8 | - cpu_info_table[2].value; - - sys_info->processor_architecture = MD_CPU_ARCHITECTURE_UNKNOWN; - struct utsname uts; - if (uname(&uts) == 0) { - // Match i*86 and x86* as X86 architecture. - if ((strstr(uts.machine, "x86") == uts.machine) || - (strlen(uts.machine) == 4 && - uts.machine[0] == 'i' && - uts.machine[2] == '8' && - uts.machine[3] == '6')) { - sys_info->processor_architecture = MD_CPU_ARCHITECTURE_X86; - if (vendor_id[0] != '\0') - memcpy(sys_info->cpu.x86_cpu_info.vendor_id, vendor_id, - sizeof(sys_info->cpu.x86_cpu_info.vendor_id)); - } - } - return true; -} - -bool WriteOSInformation(MinidumpFileWriter *minidump_writer, - MDRawSystemInfo *sys_info) { - sys_info->platform_id = MD_OS_LINUX; - - struct utsname uts; - if (uname(&uts) == 0) { - char os_version[512]; - size_t space_left = sizeof(os_version); - memset(os_version, 0, space_left); - const char *os_info_table[] = { - uts.sysname, - uts.release, - uts.version, - uts.machine, - "GNU/Linux", - NULL - }; - for (const char **cur_os_info = os_info_table; - *cur_os_info != NULL; - cur_os_info++) { - if (cur_os_info != os_info_table && space_left > 1) { - strcat(os_version, " "); - space_left--; - } - if (space_left > strlen(*cur_os_info)) { - strcat(os_version, *cur_os_info); - space_left -= strlen(*cur_os_info); - } else { - break; - } - } - - MDLocationDescriptor location; - if (!minidump_writer->WriteString(os_version, 0, &location)) - return false; - sys_info->csd_version_rva = location.rva; - } - return true; -} - -// Callback context for get writting thread information. -struct ThreadInfoCallbackCtx { - MinidumpFileWriter *minidump_writer; - const WriterArgument *writer_args; - TypedMDRVA<MDRawThreadList> *list; - int thread_index; -}; - -// Callback run for writing threads information in the process. -bool ThreadInfomationCallback(const ThreadInfo &thread_info, - void *context) { - ThreadInfoCallbackCtx *callback_context = - static_cast<ThreadInfoCallbackCtx *>(context); - bool success = true; - MDRawThread thread; - memset(&thread, 0, sizeof(MDRawThread)); - if (thread_info.pid != callback_context->writer_args->crashed_pid || - callback_context->writer_args->sig_ctx == NULL) { - success = WriteThreadStream(callback_context->minidump_writer, - callback_context->writer_args->thread_lister, - thread_info, &thread); - } else { - success = WriteCrashedThreadStream(callback_context->minidump_writer, - callback_context->writer_args, - thread_info, &thread); - } - if (success) { - callback_context->list->CopyIndexAfterObject( - callback_context->thread_index++, - &thread, sizeof(MDRawThread)); - } - return success; -} - -// Stream writers -bool WriteThreadListStream(MinidumpFileWriter *minidump_writer, - const WriterArgument *writer_args, - MDRawDirectory *dir) { - // Get the thread information. - const LinuxThread *thread_lister = writer_args->thread_lister; - int thread_count = thread_lister->GetThreadCount(); - if (thread_count < 0) - return false; - TypedMDRVA<MDRawThreadList> list(minidump_writer); - if (!list.AllocateObjectAndArray(thread_count, sizeof(MDRawThread))) - return false; - dir->stream_type = MD_THREAD_LIST_STREAM; - dir->location = list.location(); - list.get()->number_of_threads = thread_count; - - ThreadInfoCallbackCtx context; - context.minidump_writer = minidump_writer; - context.writer_args = writer_args; - context.list = &list; - context.thread_index = 0; - CallbackParam<ThreadCallback> callback_param(ThreadInfomationCallback, - &context); - int written = thread_lister->ListThreads(&callback_param); - return written == thread_count; -} - -bool WriteCVRecord(MinidumpFileWriter *minidump_writer, - MDRawModule *module, - const char *module_path) { - TypedMDRVA<MDCVInfoPDB70> cv(minidump_writer); - - // Only return the last path component of the full module path - const char *module_name = strrchr(module_path, '/'); - // Increment past the slash - if (module_name) - ++module_name; - else - module_name = "<Unknown>"; - - size_t module_name_length = strlen(module_name); - if (!cv.AllocateObjectAndArray(module_name_length + 1, sizeof(u_int8_t))) - return false; - if (!cv.CopyIndexAfterObject(0, const_cast<char *>(module_name), - module_name_length)) - return false; - - module->cv_record = cv.location(); - MDCVInfoPDB70 *cv_ptr = cv.get(); - memset(cv_ptr, 0, sizeof(MDCVInfoPDB70)); - cv_ptr->cv_signature = MD_CVINFOPDB70_SIGNATURE; - cv_ptr->age = 0; - - // Get the module identifier - FileID file_id(module_path); - unsigned char identifier[16]; - - if (file_id.ElfFileIdentifier(identifier)) { - cv_ptr->signature.data1 = (uint32_t)identifier[0] << 24 | - (uint32_t)identifier[1] << 16 | (uint32_t)identifier[2] << 8 | - (uint32_t)identifier[3]; - cv_ptr->signature.data2 = (uint32_t)identifier[4] << 8 | identifier[5]; - cv_ptr->signature.data3 = (uint32_t)identifier[6] << 8 | identifier[7]; - cv_ptr->signature.data4[0] = identifier[8]; - cv_ptr->signature.data4[1] = identifier[9]; - cv_ptr->signature.data4[2] = identifier[10]; - cv_ptr->signature.data4[3] = identifier[11]; - cv_ptr->signature.data4[4] = identifier[12]; - cv_ptr->signature.data4[5] = identifier[13]; - cv_ptr->signature.data4[6] = identifier[14]; - cv_ptr->signature.data4[7] = identifier[15]; - } - return true; -} - -struct ModuleInfoCallbackCtx { - MinidumpFileWriter *minidump_writer; - const WriterArgument *writer_args; - TypedMDRVA<MDRawModuleList> *list; - int module_index; -}; - -bool ModuleInfoCallback(const ModuleInfo &module_info, - void *context) { - ModuleInfoCallbackCtx *callback_context = - static_cast<ModuleInfoCallbackCtx *>(context); - // Skip those modules without name, or those that are not modules. - if (strlen(module_info.name) == 0 || - !strchr(module_info.name, '/')) - return true; - - MDRawModule module; - memset(&module, 0, sizeof(module)); - MDLocationDescriptor loc; - if (!callback_context->minidump_writer->WriteString(module_info.name, 0, - &loc)) - return false; - module.base_of_image = (u_int64_t)module_info.start_addr; - module.size_of_image = module_info.size; - module.module_name_rva = loc.rva; - - if (!WriteCVRecord(callback_context->minidump_writer, &module, - module_info.name)) - return false; - callback_context->list->CopyIndexAfterObject( - callback_context->module_index++, &module, MD_MODULE_SIZE); - return true; -} - -bool WriteModuleListStream(MinidumpFileWriter *minidump_writer, - const WriterArgument *writer_args, - MDRawDirectory *dir) { - TypedMDRVA<MDRawModuleList> list(minidump_writer); - int module_count = writer_args->thread_lister->GetModuleCount(); - if (module_count <= 0 || - !list.AllocateObjectAndArray(module_count, MD_MODULE_SIZE)) - return false; - dir->stream_type = MD_MODULE_LIST_STREAM; - dir->location = list.location(); - list.get()->number_of_modules = module_count; - ModuleInfoCallbackCtx context; - context.minidump_writer = minidump_writer; - context.writer_args = writer_args; - context.list = &list; - context.module_index = 0; - CallbackParam<ModuleCallback> callback(ModuleInfoCallback, &context); - return writer_args->thread_lister->ListModules(&callback) == module_count; -} - -bool WriteSystemInfoStream(MinidumpFileWriter *minidump_writer, - const WriterArgument *writer_args, - MDRawDirectory *dir) { - TypedMDRVA<MDRawSystemInfo> sys_info(minidump_writer); - if (!sys_info.Allocate()) - return false; - dir->stream_type = MD_SYSTEM_INFO_STREAM; - dir->location = sys_info.location(); - - return WriteCPUInformation(sys_info.get()) && - WriteOSInformation(minidump_writer, sys_info.get()); -} - -bool WriteExceptionStream(MinidumpFileWriter *minidump_writer, - const WriterArgument *writer_args, - MDRawDirectory *dir) { - // This happenes when this is not a crash, but a requested dump. - if (writer_args->sig_ctx == NULL) - return false; - - TypedMDRVA<MDRawExceptionStream> exception(minidump_writer); - if (!exception.Allocate()) - return false; - - dir->stream_type = MD_EXCEPTION_STREAM; - dir->location = exception.location(); - exception.get()->thread_id = writer_args->crashed_pid; - exception.get()->exception_record.exception_code = writer_args->signo; - exception.get()->exception_record.exception_flags = 0; - if (writer_args->sig_ctx != NULL) { - exception.get()->exception_record.exception_address = - writer_args->sig_ctx->eip; - } else { - return true; - } - - // Write context of the exception. - TypedMDRVA<MDRawContextX86> context(minidump_writer); - if (!context.Allocate()) - return false; - exception.get()->thread_context = context.location(); - memset(context.get(), 0, sizeof(MDRawContextX86)); - return WriteContext(context.get(), writer_args->sig_ctx, NULL); -} - -bool WriteMiscInfoStream(MinidumpFileWriter *minidump_writer, - const WriterArgument *writer_args, - MDRawDirectory *dir) { - TypedMDRVA<MDRawMiscInfo> info(minidump_writer); - if (!info.Allocate()) - return false; - - dir->stream_type = MD_MISC_INFO_STREAM; - dir->location = info.location(); - info.get()->size_of_info = sizeof(MDRawMiscInfo); - info.get()->flags1 = MD_MISCINFO_FLAGS1_PROCESS_ID; - info.get()->process_id = writer_args->requester_pid; - - return true; -} - -bool WriteBreakpadInfoStream(MinidumpFileWriter *minidump_writer, - const WriterArgument *writer_args, - MDRawDirectory *dir) { - TypedMDRVA<MDRawBreakpadInfo> info(minidump_writer); - if (!info.Allocate()) - return false; - - dir->stream_type = MD_BREAKPAD_INFO_STREAM; - dir->location = info.location(); - - info.get()->validity = MD_BREAKPAD_INFO_VALID_DUMP_THREAD_ID | - MD_BREAKPAD_INFO_VALID_REQUESTING_THREAD_ID; - info.get()->dump_thread_id = getpid(); - info.get()->requesting_thread_id = writer_args->requester_pid; - return true; -} - -// Prototype of writer functions. -typedef bool (*WriteStringFN)(MinidumpFileWriter *, - const WriterArgument *, - MDRawDirectory *); - -// Function table to writer a full minidump. -WriteStringFN writers[] = { - WriteThreadListStream, - WriteModuleListStream, - WriteSystemInfoStream, - WriteExceptionStream, - WriteMiscInfoStream, - WriteBreakpadInfoStream, -}; - -// Will call each writer function in the writers table. -// It runs in a different process from the crashing process, but sharing -// the same address space. This enables it to use ptrace functions. -int Write(void *argument) { - WriterArgument *writer_args = - static_cast<WriterArgument *>(argument); - - if (!writer_args->thread_lister->SuspendAllThreads()) - return -1; - - if (writer_args->sighandler_ebp != 0 && - writer_args->thread_lister->FindSigContext(writer_args->sighandler_ebp, - &writer_args->sig_ctx)) { - writer_args->crashed_stack_bottom = - writer_args->thread_lister->GetThreadStackBottom( - writer_args->sig_ctx->ebp); - int crashed_pid = FindCrashingThread(writer_args->crashed_stack_bottom, - writer_args->requester_pid, - writer_args->thread_lister); - if (crashed_pid > 0) - writer_args->crashed_pid = crashed_pid; - } - - - MinidumpFileWriter *minidump_writer = writer_args->minidump_writer; - TypedMDRVA<MDRawHeader> header(minidump_writer); - TypedMDRVA<MDRawDirectory> dir(minidump_writer); - if (!header.Allocate()) - return 0; - - int writer_count = sizeof(writers) / sizeof(writers[0]); - // Need directory space for all writers. - if (!dir.AllocateArray(writer_count)) - return 0; - header.get()->signature = MD_HEADER_SIGNATURE; - header.get()->version = MD_HEADER_VERSION; - header.get()->time_date_stamp = time(NULL); - header.get()->stream_count = writer_count; - header.get()->stream_directory_rva = dir.position(); - - int dir_index = 0; - MDRawDirectory local_dir; - for (int i = 0; i < writer_count; ++i) { - if (writers[i](minidump_writer, writer_args, &local_dir)) - dir.CopyIndex(dir_index++, &local_dir); - } - - writer_args->thread_lister->ResumeAllThreads(); - return 0; -} - -} // namespace - -namespace google_breakpad { - -MinidumpGenerator::MinidumpGenerator() { - AllocateStack(); -} - -MinidumpGenerator::~MinidumpGenerator() { -} - -void MinidumpGenerator::AllocateStack() { - stack_.reset(new char[kStackSize]); -} - -bool MinidumpGenerator::WriteMinidumpToFile(const char *file_pathname, - int signo, - uintptr_t sighandler_ebp, - struct sigcontext **sig_ctx) const { - assert(file_pathname != NULL); - assert(stack_ != NULL); - - if (stack_ == NULL || file_pathname == NULL) - return false; - - MinidumpFileWriter minidump_writer; - if (minidump_writer.Open(file_pathname)) { - WriterArgument argument; - memset(&argument, 0, sizeof(argument)); - LinuxThread thread_lister(getpid()); - argument.thread_lister = &thread_lister; - argument.minidump_writer = &minidump_writer; - argument.requester_pid = getpid(); - argument.crashed_pid = getpid(); - argument.signo = signo; - argument.sighandler_ebp = sighandler_ebp; - argument.sig_ctx = NULL; - - int cloned_pid = clone(Write, stack_.get() + kStackSize, - CLONE_VM | CLONE_FILES | CLONE_FS | CLONE_UNTRACED, - (void*)&argument); - waitpid(cloned_pid, NULL, __WALL); - if (sig_ctx != NULL) - *sig_ctx = argument.sig_ctx; - return true; - } - - return false; -} - -} // namespace google_breakpad |