| //===-- MachTask.cpp --------------------------------------------*- C++ -*-===// |
| // |
| // Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions. |
| // See https://llvm.org/LICENSE.txt for license information. |
| // SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception |
| // |
| //===----------------------------------------------------------------------===// |
| //---------------------------------------------------------------------- |
| // |
| // MachTask.cpp |
| // debugserver |
| // |
| // Created by Greg Clayton on 12/5/08. |
| // |
| //===----------------------------------------------------------------------===// |
| |
| #include "MachTask.h" |
| |
| // C Includes |
| |
| #include <mach-o/dyld_images.h> |
| #include <mach/mach_vm.h> |
| #import <sys/sysctl.h> |
| |
| #if defined(__APPLE__) |
| #include <pthread.h> |
| #include <sched.h> |
| #endif |
| |
| // C++ Includes |
| #include <iomanip> |
| #include <sstream> |
| |
| // Other libraries and framework includes |
| // Project includes |
| #include "CFUtils.h" |
| #include "DNB.h" |
| #include "DNBDataRef.h" |
| #include "DNBError.h" |
| #include "DNBLog.h" |
| #include "MachProcess.h" |
| |
| #ifdef WITH_SPRINGBOARD |
| |
| #include <CoreFoundation/CoreFoundation.h> |
| #include <SpringBoardServices/SBSWatchdogAssertion.h> |
| #include <SpringBoardServices/SpringBoardServer.h> |
| |
| #endif |
| |
| #ifdef WITH_BKS |
| extern "C" { |
| #import <BackBoardServices/BKSWatchdogAssertion.h> |
| #import <BackBoardServices/BackBoardServices.h> |
| #import <Foundation/Foundation.h> |
| } |
| #endif |
| |
| #include <AvailabilityMacros.h> |
| |
| #ifdef LLDB_ENERGY |
| #include <mach/mach_time.h> |
| #include <pmenergy.h> |
| #include <pmsample.h> |
| #endif |
| |
| extern "C" int |
| proc_get_cpumon_params(pid_t pid, int *percentage, |
| int *interval); // <libproc_internal.h> SPI |
| |
| //---------------------------------------------------------------------- |
| // MachTask constructor |
| //---------------------------------------------------------------------- |
| MachTask::MachTask(MachProcess *process) |
| : m_process(process), m_task(TASK_NULL), m_vm_memory(), |
| m_exception_thread(0), m_exception_port(MACH_PORT_NULL), |
| m_exec_will_be_suspended(false), m_do_double_resume(false) { |
| memset(&m_exc_port_info, 0, sizeof(m_exc_port_info)); |
| } |
| |
| //---------------------------------------------------------------------- |
| // Destructor |
| //---------------------------------------------------------------------- |
| MachTask::~MachTask() { Clear(); } |
| |
| //---------------------------------------------------------------------- |
| // MachTask::Suspend |
| //---------------------------------------------------------------------- |
| kern_return_t MachTask::Suspend() { |
| DNBError err; |
| task_t task = TaskPort(); |
| err = ::task_suspend(task); |
| if (DNBLogCheckLogBit(LOG_TASK) || err.Fail()) |
| err.LogThreaded("::task_suspend ( target_task = 0x%4.4x )", task); |
| return err.Status(); |
| } |
| |
| //---------------------------------------------------------------------- |
| // MachTask::Resume |
| //---------------------------------------------------------------------- |
| kern_return_t MachTask::Resume() { |
| struct task_basic_info task_info; |
| task_t task = TaskPort(); |
| if (task == TASK_NULL) |
| return KERN_INVALID_ARGUMENT; |
| |
| DNBError err; |
| err = BasicInfo(task, &task_info); |
| |
| if (err.Success()) { |
| if (m_do_double_resume && task_info.suspend_count == 2) { |
| err = ::task_resume(task); |
| if (DNBLogCheckLogBit(LOG_TASK) || err.Fail()) |
| err.LogThreaded("::task_resume double-resume after exec-start-stopped " |
| "( target_task = 0x%4.4x )", task); |
| } |
| m_do_double_resume = false; |
| |
| // task_resume isn't counted like task_suspend calls are, are, so if the |
| // task is not suspended, don't try and resume it since it is already |
| // running |
| if (task_info.suspend_count > 0) { |
| err = ::task_resume(task); |
| if (DNBLogCheckLogBit(LOG_TASK) || err.Fail()) |
| err.LogThreaded("::task_resume ( target_task = 0x%4.4x )", task); |
| } |
| } |
| return err.Status(); |
| } |
| |
| //---------------------------------------------------------------------- |
| // MachTask::ExceptionPort |
| //---------------------------------------------------------------------- |
| mach_port_t MachTask::ExceptionPort() const { return m_exception_port; } |
| |
| //---------------------------------------------------------------------- |
| // MachTask::ExceptionPortIsValid |
| //---------------------------------------------------------------------- |
| bool MachTask::ExceptionPortIsValid() const { |
| return MACH_PORT_VALID(m_exception_port); |
| } |
| |
| //---------------------------------------------------------------------- |
| // MachTask::Clear |
| //---------------------------------------------------------------------- |
| void MachTask::Clear() { |
| // Do any cleanup needed for this task |
| m_task = TASK_NULL; |
| m_exception_thread = 0; |
| m_exception_port = MACH_PORT_NULL; |
| m_exec_will_be_suspended = false; |
| m_do_double_resume = false; |
| } |
| |
| //---------------------------------------------------------------------- |
| // MachTask::SaveExceptionPortInfo |
| //---------------------------------------------------------------------- |
| kern_return_t MachTask::SaveExceptionPortInfo() { |
| return m_exc_port_info.Save(TaskPort()); |
| } |
| |
| //---------------------------------------------------------------------- |
| // MachTask::RestoreExceptionPortInfo |
| //---------------------------------------------------------------------- |
| kern_return_t MachTask::RestoreExceptionPortInfo() { |
| return m_exc_port_info.Restore(TaskPort()); |
| } |
| |
| //---------------------------------------------------------------------- |
| // MachTask::ReadMemory |
| //---------------------------------------------------------------------- |
| nub_size_t MachTask::ReadMemory(nub_addr_t addr, nub_size_t size, void *buf) { |
| nub_size_t n = 0; |
| task_t task = TaskPort(); |
| if (task != TASK_NULL) { |
| n = m_vm_memory.Read(task, addr, buf, size); |
| |
| DNBLogThreadedIf(LOG_MEMORY, "MachTask::ReadMemory ( addr = 0x%8.8llx, " |
| "size = %llu, buf = %p) => %llu bytes read", |
| (uint64_t)addr, (uint64_t)size, buf, (uint64_t)n); |
| if (DNBLogCheckLogBit(LOG_MEMORY_DATA_LONG) || |
| (DNBLogCheckLogBit(LOG_MEMORY_DATA_SHORT) && size <= 8)) { |
| DNBDataRef data((uint8_t *)buf, n, false); |
| data.Dump(0, static_cast<DNBDataRef::offset_t>(n), addr, |
| DNBDataRef::TypeUInt8, 16); |
| } |
| } |
| return n; |
| } |
| |
| //---------------------------------------------------------------------- |
| // MachTask::WriteMemory |
| //---------------------------------------------------------------------- |
| nub_size_t MachTask::WriteMemory(nub_addr_t addr, nub_size_t size, |
| const void *buf) { |
| nub_size_t n = 0; |
| task_t task = TaskPort(); |
| if (task != TASK_NULL) { |
| n = m_vm_memory.Write(task, addr, buf, size); |
| DNBLogThreadedIf(LOG_MEMORY, "MachTask::WriteMemory ( addr = 0x%8.8llx, " |
| "size = %llu, buf = %p) => %llu bytes written", |
| (uint64_t)addr, (uint64_t)size, buf, (uint64_t)n); |
| if (DNBLogCheckLogBit(LOG_MEMORY_DATA_LONG) || |
| (DNBLogCheckLogBit(LOG_MEMORY_DATA_SHORT) && size <= 8)) { |
| DNBDataRef data((const uint8_t *)buf, n, false); |
| data.Dump(0, static_cast<DNBDataRef::offset_t>(n), addr, |
| DNBDataRef::TypeUInt8, 16); |
| } |
| } |
| return n; |
| } |
| |
| //---------------------------------------------------------------------- |
| // MachTask::MemoryRegionInfo |
| //---------------------------------------------------------------------- |
| int MachTask::GetMemoryRegionInfo(nub_addr_t addr, DNBRegionInfo *region_info) { |
| task_t task = TaskPort(); |
| if (task == TASK_NULL) |
| return -1; |
| |
| int ret = m_vm_memory.GetMemoryRegionInfo(task, addr, region_info); |
| DNBLogThreadedIf(LOG_MEMORY, "MachTask::MemoryRegionInfo ( addr = 0x%8.8llx " |
| ") => %i (start = 0x%8.8llx, size = 0x%8.8llx, " |
| "permissions = %u)", |
| (uint64_t)addr, ret, (uint64_t)region_info->addr, |
| (uint64_t)region_info->size, region_info->permissions); |
| return ret; |
| } |
| |
| #define TIME_VALUE_TO_TIMEVAL(a, r) \ |
| do { \ |
| (r)->tv_sec = (a)->seconds; \ |
| (r)->tv_usec = (a)->microseconds; \ |
| } while (0) |
| |
| // We should consider moving this into each MacThread. |
| static void get_threads_profile_data(DNBProfileDataScanType scanType, |
| task_t task, nub_process_t pid, |
| std::vector<uint64_t> &threads_id, |
| std::vector<std::string> &threads_name, |
| std::vector<uint64_t> &threads_used_usec) { |
| kern_return_t kr; |
| thread_act_array_t threads; |
| mach_msg_type_number_t tcnt; |
| |
| kr = task_threads(task, &threads, &tcnt); |
| if (kr != KERN_SUCCESS) |
| return; |
| |
| for (mach_msg_type_number_t i = 0; i < tcnt; i++) { |
| thread_identifier_info_data_t identifier_info; |
| mach_msg_type_number_t count = THREAD_IDENTIFIER_INFO_COUNT; |
| kr = ::thread_info(threads[i], THREAD_IDENTIFIER_INFO, |
| (thread_info_t)&identifier_info, &count); |
| if (kr != KERN_SUCCESS) |
| continue; |
| |
| thread_basic_info_data_t basic_info; |
| count = THREAD_BASIC_INFO_COUNT; |
| kr = ::thread_info(threads[i], THREAD_BASIC_INFO, |
| (thread_info_t)&basic_info, &count); |
| if (kr != KERN_SUCCESS) |
| continue; |
| |
| if ((basic_info.flags & TH_FLAGS_IDLE) == 0) { |
| nub_thread_t tid = |
| MachThread::GetGloballyUniqueThreadIDForMachPortID(threads[i]); |
| threads_id.push_back(tid); |
| |
| if ((scanType & eProfileThreadName) && |
| (identifier_info.thread_handle != 0)) { |
| struct proc_threadinfo proc_threadinfo; |
| int len = ::proc_pidinfo(pid, PROC_PIDTHREADINFO, |
| identifier_info.thread_handle, |
| &proc_threadinfo, PROC_PIDTHREADINFO_SIZE); |
| if (len && proc_threadinfo.pth_name[0]) { |
| threads_name.push_back(proc_threadinfo.pth_name); |
| } else { |
| threads_name.push_back(""); |
| } |
| } else { |
| threads_name.push_back(""); |
| } |
| struct timeval tv; |
| struct timeval thread_tv; |
| TIME_VALUE_TO_TIMEVAL(&basic_info.user_time, &thread_tv); |
| TIME_VALUE_TO_TIMEVAL(&basic_info.system_time, &tv); |
| timeradd(&thread_tv, &tv, &thread_tv); |
| uint64_t used_usec = thread_tv.tv_sec * 1000000ULL + thread_tv.tv_usec; |
| threads_used_usec.push_back(used_usec); |
| } |
| |
| mach_port_deallocate(mach_task_self(), threads[i]); |
| } |
| mach_vm_deallocate(mach_task_self(), (mach_vm_address_t)(uintptr_t)threads, |
| tcnt * sizeof(*threads)); |
| } |
| |
| #define RAW_HEXBASE std::setfill('0') << std::hex << std::right |
| #define DECIMAL std::dec << std::setfill(' ') |
| std::string MachTask::GetProfileData(DNBProfileDataScanType scanType) { |
| std::string result; |
| |
| static int32_t numCPU = -1; |
| struct host_cpu_load_info host_info; |
| if (scanType & eProfileHostCPU) { |
| int32_t mib[] = {CTL_HW, HW_AVAILCPU}; |
| size_t len = sizeof(numCPU); |
| if (numCPU == -1) { |
| if (sysctl(mib, sizeof(mib) / sizeof(int32_t), &numCPU, &len, NULL, 0) != |
| 0) |
| return result; |
| } |
| |
| mach_port_t localHost = mach_host_self(); |
| mach_msg_type_number_t count = HOST_CPU_LOAD_INFO_COUNT; |
| kern_return_t kr = host_statistics(localHost, HOST_CPU_LOAD_INFO, |
| (host_info_t)&host_info, &count); |
| if (kr != KERN_SUCCESS) |
| return result; |
| } |
| |
| task_t task = TaskPort(); |
| if (task == TASK_NULL) |
| return result; |
| |
| pid_t pid = m_process->ProcessID(); |
| |
| struct task_basic_info task_info; |
| DNBError err; |
| err = BasicInfo(task, &task_info); |
| |
| if (!err.Success()) |
| return result; |
| |
| uint64_t elapsed_usec = 0; |
| uint64_t task_used_usec = 0; |
| if (scanType & eProfileCPU) { |
| // Get current used time. |
| struct timeval current_used_time; |
| struct timeval tv; |
| TIME_VALUE_TO_TIMEVAL(&task_info.user_time, ¤t_used_time); |
| TIME_VALUE_TO_TIMEVAL(&task_info.system_time, &tv); |
| timeradd(¤t_used_time, &tv, ¤t_used_time); |
| task_used_usec = |
| current_used_time.tv_sec * 1000000ULL + current_used_time.tv_usec; |
| |
| struct timeval current_elapsed_time; |
| int res = gettimeofday(¤t_elapsed_time, NULL); |
| if (res == 0) { |
| elapsed_usec = current_elapsed_time.tv_sec * 1000000ULL + |
| current_elapsed_time.tv_usec; |
| } |
| } |
| |
| std::vector<uint64_t> threads_id; |
| std::vector<std::string> threads_name; |
| std::vector<uint64_t> threads_used_usec; |
| |
| if (scanType & eProfileThreadsCPU) { |
| get_threads_profile_data(scanType, task, pid, threads_id, threads_name, |
| threads_used_usec); |
| } |
| |
| vm_statistics64_data_t vminfo; |
| uint64_t physical_memory = 0; |
| uint64_t anonymous = 0; |
| uint64_t phys_footprint = 0; |
| uint64_t memory_cap = 0; |
| if (m_vm_memory.GetMemoryProfile(scanType, task, task_info, |
| m_process->GetCPUType(), pid, vminfo, |
| physical_memory, anonymous, |
| phys_footprint, memory_cap)) { |
| std::ostringstream profile_data_stream; |
| |
| if (scanType & eProfileHostCPU) { |
| profile_data_stream << "num_cpu:" << numCPU << ';'; |
| profile_data_stream << "host_user_ticks:" |
| << host_info.cpu_ticks[CPU_STATE_USER] << ';'; |
| profile_data_stream << "host_sys_ticks:" |
| << host_info.cpu_ticks[CPU_STATE_SYSTEM] << ';'; |
| profile_data_stream << "host_idle_ticks:" |
| << host_info.cpu_ticks[CPU_STATE_IDLE] << ';'; |
| } |
| |
| if (scanType & eProfileCPU) { |
| profile_data_stream << "elapsed_usec:" << elapsed_usec << ';'; |
| profile_data_stream << "task_used_usec:" << task_used_usec << ';'; |
| } |
| |
| if (scanType & eProfileThreadsCPU) { |
| const size_t num_threads = threads_id.size(); |
| for (size_t i = 0; i < num_threads; i++) { |
| profile_data_stream << "thread_used_id:" << std::hex << threads_id[i] |
| << std::dec << ';'; |
| profile_data_stream << "thread_used_usec:" << threads_used_usec[i] |
| << ';'; |
| |
| if (scanType & eProfileThreadName) { |
| profile_data_stream << "thread_used_name:"; |
| const size_t len = threads_name[i].size(); |
| if (len) { |
| const char *thread_name = threads_name[i].c_str(); |
| // Make sure that thread name doesn't interfere with our delimiter. |
| profile_data_stream << RAW_HEXBASE << std::setw(2); |
| const uint8_t *ubuf8 = (const uint8_t *)(thread_name); |
| for (size_t j = 0; j < len; j++) { |
| profile_data_stream << (uint32_t)(ubuf8[j]); |
| } |
| // Reset back to DECIMAL. |
| profile_data_stream << DECIMAL; |
| } |
| profile_data_stream << ';'; |
| } |
| } |
| } |
| |
| if (scanType & eProfileHostMemory) |
| profile_data_stream << "total:" << physical_memory << ';'; |
| |
| if (scanType & eProfileMemory) { |
| static vm_size_t pagesize = vm_kernel_page_size; |
| |
| // This mimicks Activity Monitor. |
| uint64_t total_used_count = |
| (physical_memory / pagesize) - |
| (vminfo.free_count - vminfo.speculative_count) - |
| vminfo.external_page_count - vminfo.purgeable_count; |
| profile_data_stream << "used:" << total_used_count * pagesize << ';'; |
| |
| if (scanType & eProfileMemoryAnonymous) { |
| profile_data_stream << "anonymous:" << anonymous << ';'; |
| } |
| |
| profile_data_stream << "phys_footprint:" << phys_footprint << ';'; |
| } |
| |
| if (scanType & eProfileMemoryCap) { |
| profile_data_stream << "mem_cap:" << memory_cap << ';'; |
| } |
| |
| #ifdef LLDB_ENERGY |
| if (scanType & eProfileEnergy) { |
| struct rusage_info_v2 info; |
| int rc = proc_pid_rusage(pid, RUSAGE_INFO_V2, (rusage_info_t *)&info); |
| if (rc == 0) { |
| uint64_t now = mach_absolute_time(); |
| pm_task_energy_data_t pm_energy; |
| memset(&pm_energy, 0, sizeof(pm_energy)); |
| /* |
| * Disable most features of pm_sample_pid. It will gather |
| * network/GPU/WindowServer information; fill in the rest. |
| */ |
| pm_sample_task_and_pid(task, pid, &pm_energy, now, |
| PM_SAMPLE_ALL & ~PM_SAMPLE_NAME & |
| ~PM_SAMPLE_INTERVAL & ~PM_SAMPLE_CPU & |
| ~PM_SAMPLE_DISK); |
| pm_energy.sti.total_user = info.ri_user_time; |
| pm_energy.sti.total_system = info.ri_system_time; |
| pm_energy.sti.task_interrupt_wakeups = info.ri_interrupt_wkups; |
| pm_energy.sti.task_platform_idle_wakeups = info.ri_pkg_idle_wkups; |
| pm_energy.diskio_bytesread = info.ri_diskio_bytesread; |
| pm_energy.diskio_byteswritten = info.ri_diskio_byteswritten; |
| pm_energy.pageins = info.ri_pageins; |
| |
| uint64_t total_energy = |
| (uint64_t)(pm_energy_impact(&pm_energy) * NSEC_PER_SEC); |
| // uint64_t process_age = now - info.ri_proc_start_abstime; |
| // uint64_t avg_energy = 100.0 * (double)total_energy / |
| // (double)process_age; |
| |
| profile_data_stream << "energy:" << total_energy << ';'; |
| } |
| } |
| #endif |
| |
| if (scanType & eProfileEnergyCPUCap) { |
| int percentage = -1; |
| int interval = -1; |
| int result = proc_get_cpumon_params(pid, &percentage, &interval); |
| if ((result == 0) && (percentage >= 0) && (interval >= 0)) { |
| profile_data_stream << "cpu_cap_p:" << percentage << ';'; |
| profile_data_stream << "cpu_cap_t:" << interval << ';'; |
| } |
| } |
| |
| profile_data_stream << "--end--;"; |
| |
| result = profile_data_stream.str(); |
| } |
| |
| return result; |
| } |
| |
| //---------------------------------------------------------------------- |
| // MachTask::TaskPortForProcessID |
| //---------------------------------------------------------------------- |
| task_t MachTask::TaskPortForProcessID(DNBError &err, bool force) { |
| if (((m_task == TASK_NULL) || force) && m_process != NULL) |
| m_task = MachTask::TaskPortForProcessID(m_process->ProcessID(), err); |
| return m_task; |
| } |
| |
| //---------------------------------------------------------------------- |
| // MachTask::TaskPortForProcessID |
| //---------------------------------------------------------------------- |
| task_t MachTask::TaskPortForProcessID(pid_t pid, DNBError &err, |
| uint32_t num_retries, |
| uint32_t usec_interval) { |
| if (pid != INVALID_NUB_PROCESS) { |
| DNBError err; |
| mach_port_t task_self = mach_task_self(); |
| task_t task = TASK_NULL; |
| for (uint32_t i = 0; i < num_retries; i++) { |
| DNBLog("[LaunchAttach] (%d) about to task_for_pid(%d)", getpid(), pid); |
| err = ::task_for_pid(task_self, pid, &task); |
| |
| if (DNBLogCheckLogBit(LOG_TASK) || err.Fail()) { |
| char str[1024]; |
| ::snprintf(str, sizeof(str), "::task_for_pid ( target_tport = 0x%4.4x, " |
| "pid = %d, &task ) => err = 0x%8.8x (%s)", |
| task_self, pid, err.Status(), |
| err.AsString() ? err.AsString() : "success"); |
| if (err.Fail()) { |
| err.SetErrorString(str); |
| DNBLogError( |
| "[LaunchAttach] MachTask::TaskPortForProcessID task_for_pid(%d) " |
| "failed: %s", |
| pid, str); |
| } |
| err.LogThreaded(str); |
| } |
| |
| if (err.Success()) { |
| DNBLog("[LaunchAttach] (%d) successfully task_for_pid(%d)'ed", getpid(), |
| pid); |
| return task; |
| } |
| |
| // Sleep a bit and try again |
| ::usleep(usec_interval); |
| } |
| } |
| return TASK_NULL; |
| } |
| |
| //---------------------------------------------------------------------- |
| // MachTask::BasicInfo |
| //---------------------------------------------------------------------- |
| kern_return_t MachTask::BasicInfo(struct task_basic_info *info) { |
| return BasicInfo(TaskPort(), info); |
| } |
| |
| //---------------------------------------------------------------------- |
| // MachTask::BasicInfo |
| //---------------------------------------------------------------------- |
| kern_return_t MachTask::BasicInfo(task_t task, struct task_basic_info *info) { |
| if (info == NULL) |
| return KERN_INVALID_ARGUMENT; |
| |
| DNBError err; |
| mach_msg_type_number_t count = TASK_BASIC_INFO_COUNT; |
| err = ::task_info(task, TASK_BASIC_INFO, (task_info_t)info, &count); |
| const bool log_process = DNBLogCheckLogBit(LOG_TASK); |
| if (log_process || err.Fail()) |
| err.LogThreaded("::task_info ( target_task = 0x%4.4x, flavor = " |
| "TASK_BASIC_INFO, task_info_out => %p, task_info_outCnt => " |
| "%u )", |
| task, info, count); |
| if (DNBLogCheckLogBit(LOG_TASK) && DNBLogCheckLogBit(LOG_VERBOSE) && |
| err.Success()) { |
| float user = (float)info->user_time.seconds + |
| (float)info->user_time.microseconds / 1000000.0f; |
| float system = (float)info->user_time.seconds + |
| (float)info->user_time.microseconds / 1000000.0f; |
| DNBLogThreaded("task_basic_info = { suspend_count = %i, virtual_size = " |
| "0x%8.8llx, resident_size = 0x%8.8llx, user_time = %f, " |
| "system_time = %f }", |
| info->suspend_count, (uint64_t)info->virtual_size, |
| (uint64_t)info->resident_size, user, system); |
| } |
| return err.Status(); |
| } |
| |
| //---------------------------------------------------------------------- |
| // MachTask::IsValid |
| // |
| // Returns true if a task is a valid task port for a current process. |
| //---------------------------------------------------------------------- |
| bool MachTask::IsValid() const { return MachTask::IsValid(TaskPort()); } |
| |
| //---------------------------------------------------------------------- |
| // MachTask::IsValid |
| // |
| // Returns true if a task is a valid task port for a current process. |
| //---------------------------------------------------------------------- |
| bool MachTask::IsValid(task_t task) { |
| if (task != TASK_NULL) { |
| struct task_basic_info task_info; |
| return BasicInfo(task, &task_info) == KERN_SUCCESS; |
| } |
| return false; |
| } |
| |
| bool MachTask::StartExceptionThread(bool unmask_signals, DNBError &err) { |
| DNBLogThreadedIf(LOG_EXCEPTIONS, "MachTask::%s ( )", __FUNCTION__); |
| |
| task_t task = TaskPortForProcessID(err); |
| if (MachTask::IsValid(task)) { |
| // Got the mach port for the current process |
| mach_port_t task_self = mach_task_self(); |
| |
| // Allocate an exception port that we will use to track our child process |
| err = ::mach_port_allocate(task_self, MACH_PORT_RIGHT_RECEIVE, |
| &m_exception_port); |
| if (err.Fail()) |
| return false; |
| |
| // Add the ability to send messages on the new exception port |
| err = ::mach_port_insert_right(task_self, m_exception_port, |
| m_exception_port, MACH_MSG_TYPE_MAKE_SEND); |
| if (err.Fail()) |
| return false; |
| |
| // Save the original state of the exception ports for our child process |
| SaveExceptionPortInfo(); |
| |
| // We weren't able to save the info for our exception ports, we must stop... |
| if (m_exc_port_info.mask == 0) { |
| err.SetErrorString("failed to get exception port info"); |
| return false; |
| } |
| |
| if (unmask_signals) { |
| m_exc_port_info.mask = m_exc_port_info.mask & |
| ~(EXC_MASK_BAD_ACCESS | EXC_MASK_BAD_INSTRUCTION | |
| EXC_MASK_ARITHMETIC); |
| } |
| |
| // Set the ability to get all exceptions on this port |
| err = ::task_set_exception_ports( |
| task, m_exc_port_info.mask, m_exception_port, |
| EXCEPTION_DEFAULT | MACH_EXCEPTION_CODES, THREAD_STATE_NONE); |
| if (DNBLogCheckLogBit(LOG_EXCEPTIONS) || err.Fail()) { |
| err.LogThreaded("::task_set_exception_ports ( task = 0x%4.4x, " |
| "exception_mask = 0x%8.8x, new_port = 0x%4.4x, behavior " |
| "= 0x%8.8x, new_flavor = 0x%8.8x )", |
| task, m_exc_port_info.mask, m_exception_port, |
| (EXCEPTION_DEFAULT | MACH_EXCEPTION_CODES), |
| THREAD_STATE_NONE); |
| } |
| |
| if (err.Fail()) |
| return false; |
| |
| // Create the exception thread |
| err = ::pthread_create(&m_exception_thread, NULL, MachTask::ExceptionThread, |
| this); |
| return err.Success(); |
| } else { |
| DNBLogError("MachTask::%s (): task invalid, exception thread start failed.", |
| __FUNCTION__); |
| } |
| return false; |
| } |
| |
| kern_return_t MachTask::ShutDownExcecptionThread() { |
| DNBError err; |
| |
| err = RestoreExceptionPortInfo(); |
| |
| // NULL our our exception port and let our exception thread exit |
| mach_port_t exception_port = m_exception_port; |
| m_exception_port = 0; |
| |
| err.SetError(::pthread_cancel(m_exception_thread), DNBError::POSIX); |
| if (DNBLogCheckLogBit(LOG_TASK) || err.Fail()) |
| err.LogThreaded("::pthread_cancel ( thread = %p )", m_exception_thread); |
| |
| err.SetError(::pthread_join(m_exception_thread, NULL), DNBError::POSIX); |
| if (DNBLogCheckLogBit(LOG_TASK) || err.Fail()) |
| err.LogThreaded("::pthread_join ( thread = %p, value_ptr = NULL)", |
| m_exception_thread); |
| |
| // Deallocate our exception port that we used to track our child process |
| mach_port_t task_self = mach_task_self(); |
| err = ::mach_port_deallocate(task_self, exception_port); |
| if (DNBLogCheckLogBit(LOG_TASK) || err.Fail()) |
| err.LogThreaded("::mach_port_deallocate ( task = 0x%4.4x, name = 0x%4.4x )", |
| task_self, exception_port); |
| |
| m_exec_will_be_suspended = false; |
| m_do_double_resume = false; |
| |
| return err.Status(); |
| } |
| |
| void *MachTask::ExceptionThread(void *arg) { |
| if (arg == NULL) |
| return NULL; |
| |
| MachTask *mach_task = (MachTask *)arg; |
| MachProcess *mach_proc = mach_task->Process(); |
| DNBLogThreadedIf(LOG_EXCEPTIONS, |
| "MachTask::%s ( arg = %p ) starting thread...", __FUNCTION__, |
| arg); |
| |
| #if defined(__APPLE__) |
| pthread_setname_np("exception monitoring thread"); |
| #if defined(__arm__) || defined(__arm64__) || defined(__aarch64__) |
| struct sched_param thread_param; |
| int thread_sched_policy; |
| if (pthread_getschedparam(pthread_self(), &thread_sched_policy, |
| &thread_param) == 0) { |
| thread_param.sched_priority = 47; |
| pthread_setschedparam(pthread_self(), thread_sched_policy, &thread_param); |
| } |
| #endif |
| #endif |
| |
| // We keep a count of the number of consecutive exceptions received so |
| // we know to grab all exceptions without a timeout. We do this to get a |
| // bunch of related exceptions on our exception port so we can process |
| // then together. When we have multiple threads, we can get an exception |
| // per thread and they will come in consecutively. The main loop in this |
| // thread can stop periodically if needed to service things related to this |
| // process. |
| // flag set in the options, so we will wait forever for an exception on |
| // our exception port. After we get one exception, we then will use the |
| // MACH_RCV_TIMEOUT option with a zero timeout to grab all other current |
| // exceptions for our process. After we have received the last pending |
| // exception, we will get a timeout which enables us to then notify |
| // our main thread that we have an exception bundle available. We then wait |
| // for the main thread to tell this exception thread to start trying to get |
| // exceptions messages again and we start again with a mach_msg read with |
| // infinite timeout. |
| uint32_t num_exceptions_received = 0; |
| DNBError err; |
| task_t task = mach_task->TaskPort(); |
| mach_msg_timeout_t periodic_timeout = 0; |
| |
| #if defined(WITH_SPRINGBOARD) && !defined(WITH_BKS) |
| mach_msg_timeout_t watchdog_elapsed = 0; |
| mach_msg_timeout_t watchdog_timeout = 60 * 1000; |
| pid_t pid = mach_proc->ProcessID(); |
| CFReleaser<SBSWatchdogAssertionRef> watchdog; |
| |
| if (mach_proc->ProcessUsingSpringBoard()) { |
| // Request a renewal for every 60 seconds if we attached using SpringBoard |
| watchdog.reset(::SBSWatchdogAssertionCreateForPID(NULL, pid, 60)); |
| DNBLogThreadedIf( |
| LOG_TASK, "::SBSWatchdogAssertionCreateForPID (NULL, %4.4x, 60 ) => %p", |
| pid, watchdog.get()); |
| |
| if (watchdog.get()) { |
| ::SBSWatchdogAssertionRenew(watchdog.get()); |
| |
| CFTimeInterval watchdogRenewalInterval = |
| ::SBSWatchdogAssertionGetRenewalInterval(watchdog.get()); |
| DNBLogThreadedIf( |
| LOG_TASK, |
| "::SBSWatchdogAssertionGetRenewalInterval ( %p ) => %g seconds", |
| watchdog.get(), watchdogRenewalInterval); |
| if (watchdogRenewalInterval > 0.0) { |
| watchdog_timeout = (mach_msg_timeout_t)watchdogRenewalInterval * 1000; |
| if (watchdog_timeout > 3000) |
| watchdog_timeout -= 1000; // Give us a second to renew our timeout |
| else if (watchdog_timeout > 1000) |
| watchdog_timeout -= |
| 250; // Give us a quarter of a second to renew our timeout |
| } |
| } |
| if (periodic_timeout == 0 || periodic_timeout > watchdog_timeout) |
| periodic_timeout = watchdog_timeout; |
| } |
| #endif // #if defined (WITH_SPRINGBOARD) && !defined (WITH_BKS) |
| |
| #ifdef WITH_BKS |
| CFReleaser<BKSWatchdogAssertionRef> watchdog; |
| if (mach_proc->ProcessUsingBackBoard()) { |
| pid_t pid = mach_proc->ProcessID(); |
| CFAllocatorRef alloc = kCFAllocatorDefault; |
| watchdog.reset(::BKSWatchdogAssertionCreateForPID(alloc, pid)); |
| } |
| #endif // #ifdef WITH_BKS |
| |
| while (mach_task->ExceptionPortIsValid()) { |
| ::pthread_testcancel(); |
| |
| MachException::Message exception_message; |
| |
| if (num_exceptions_received > 0) { |
| // No timeout, just receive as many exceptions as we can since we already |
| // have one and we want |
| // to get all currently available exceptions for this task |
| err = exception_message.Receive( |
| mach_task->ExceptionPort(), |
| MACH_RCV_MSG | MACH_RCV_INTERRUPT | MACH_RCV_TIMEOUT, 1); |
| } else if (periodic_timeout > 0) { |
| // We need to stop periodically in this loop, so try and get a mach |
| // message with a valid timeout (ms) |
| err = exception_message.Receive(mach_task->ExceptionPort(), |
| MACH_RCV_MSG | MACH_RCV_INTERRUPT | |
| MACH_RCV_TIMEOUT, |
| periodic_timeout); |
| } else { |
| // We don't need to parse all current exceptions or stop periodically, |
| // just wait for an exception forever. |
| err = exception_message.Receive(mach_task->ExceptionPort(), |
| MACH_RCV_MSG | MACH_RCV_INTERRUPT, 0); |
| } |
| |
| if (err.Status() == MACH_RCV_INTERRUPTED) { |
| // If we have no task port we should exit this thread |
| if (!mach_task->ExceptionPortIsValid()) { |
| DNBLogThreadedIf(LOG_EXCEPTIONS, "thread cancelled..."); |
| break; |
| } |
| |
| // Make sure our task is still valid |
| if (MachTask::IsValid(task)) { |
| // Task is still ok |
| DNBLogThreadedIf(LOG_EXCEPTIONS, |
| "interrupted, but task still valid, continuing..."); |
| continue; |
| } else { |
| DNBLogThreadedIf(LOG_EXCEPTIONS, "task has exited..."); |
| mach_proc->SetState(eStateExited); |
| // Our task has died, exit the thread. |
| break; |
| } |
| } else if (err.Status() == MACH_RCV_TIMED_OUT) { |
| if (num_exceptions_received > 0) { |
| // We were receiving all current exceptions with a timeout of zero |
| // it is time to go back to our normal looping mode |
| num_exceptions_received = 0; |
| |
| // Notify our main thread we have a complete exception message |
| // bundle available and get the possibly updated task port back |
| // from the process in case we exec'ed and our task port changed |
| task = mach_proc->ExceptionMessageBundleComplete(); |
| |
| // in case we use a timeout value when getting exceptions... |
| // Make sure our task is still valid |
| if (MachTask::IsValid(task)) { |
| // Task is still ok |
| DNBLogThreadedIf(LOG_EXCEPTIONS, "got a timeout, continuing..."); |
| continue; |
| } else { |
| DNBLogThreadedIf(LOG_EXCEPTIONS, "task has exited..."); |
| mach_proc->SetState(eStateExited); |
| // Our task has died, exit the thread. |
| break; |
| } |
| } |
| |
| #if defined(WITH_SPRINGBOARD) && !defined(WITH_BKS) |
| if (watchdog.get()) { |
| watchdog_elapsed += periodic_timeout; |
| if (watchdog_elapsed >= watchdog_timeout) { |
| DNBLogThreadedIf(LOG_TASK, "SBSWatchdogAssertionRenew ( %p )", |
| watchdog.get()); |
| ::SBSWatchdogAssertionRenew(watchdog.get()); |
| watchdog_elapsed = 0; |
| } |
| } |
| #endif |
| } else if (err.Status() != KERN_SUCCESS) { |
| DNBLogThreadedIf(LOG_EXCEPTIONS, "got some other error, do something " |
| "about it??? nah, continuing for " |
| "now..."); |
| // TODO: notify of error? |
| } else { |
| if (exception_message.CatchExceptionRaise(task)) { |
| if (exception_message.state.task_port != task) { |
| if (exception_message.state.IsValid()) { |
| // We exec'ed and our task port changed on us. |
| DNBLogThreadedIf(LOG_EXCEPTIONS, |
| "task port changed from 0x%4.4x to 0x%4.4x", |
| task, exception_message.state.task_port); |
| task = exception_message.state.task_port; |
| mach_task->TaskPortChanged(exception_message.state.task_port); |
| } |
| } |
| ++num_exceptions_received; |
| mach_proc->ExceptionMessageReceived(exception_message); |
| } |
| } |
| } |
| |
| #if defined(WITH_SPRINGBOARD) && !defined(WITH_BKS) |
| if (watchdog.get()) { |
| // TODO: change SBSWatchdogAssertionRelease to SBSWatchdogAssertionCancel |
| // when we |
| // all are up and running on systems that support it. The SBS framework has |
| // a #define |
| // that will forward SBSWatchdogAssertionRelease to |
| // SBSWatchdogAssertionCancel for now |
| // so it should still build either way. |
| DNBLogThreadedIf(LOG_TASK, "::SBSWatchdogAssertionRelease(%p)", |
| watchdog.get()); |
| ::SBSWatchdogAssertionRelease(watchdog.get()); |
| } |
| #endif // #if defined (WITH_SPRINGBOARD) && !defined (WITH_BKS) |
| |
| DNBLogThreadedIf(LOG_EXCEPTIONS, "MachTask::%s (%p): thread exiting...", |
| __FUNCTION__, arg); |
| return NULL; |
| } |
| |
| // So the TASK_DYLD_INFO used to just return the address of the all image infos |
| // as a single member called "all_image_info". Then someone decided it would be |
| // a good idea to rename this first member to "all_image_info_addr" and add a |
| // size member called "all_image_info_size". This of course can not be detected |
| // using code or #defines. So to hack around this problem, we define our own |
| // version of the TASK_DYLD_INFO structure so we can guarantee what is inside |
| // it. |
| |
| struct hack_task_dyld_info { |
| mach_vm_address_t all_image_info_addr; |
| mach_vm_size_t all_image_info_size; |
| }; |
| |
| nub_addr_t MachTask::GetDYLDAllImageInfosAddress(DNBError &err) { |
| struct hack_task_dyld_info dyld_info; |
| mach_msg_type_number_t count = TASK_DYLD_INFO_COUNT; |
| // Make sure that COUNT isn't bigger than our hacked up struct |
| // hack_task_dyld_info. |
| // If it is, then make COUNT smaller to match. |
| if (count > (sizeof(struct hack_task_dyld_info) / sizeof(natural_t))) |
| count = (sizeof(struct hack_task_dyld_info) / sizeof(natural_t)); |
| |
| task_t task = TaskPortForProcessID(err); |
| if (err.Success()) { |
| err = ::task_info(task, TASK_DYLD_INFO, (task_info_t)&dyld_info, &count); |
| if (err.Success()) { |
| // We now have the address of the all image infos structure |
| return dyld_info.all_image_info_addr; |
| } |
| } |
| return INVALID_NUB_ADDRESS; |
| } |
| |
| //---------------------------------------------------------------------- |
| // MachTask::AllocateMemory |
| //---------------------------------------------------------------------- |
| nub_addr_t MachTask::AllocateMemory(size_t size, uint32_t permissions) { |
| mach_vm_address_t addr; |
| task_t task = TaskPort(); |
| if (task == TASK_NULL) |
| return INVALID_NUB_ADDRESS; |
| |
| DNBError err; |
| err = ::mach_vm_allocate(task, &addr, size, TRUE); |
| if (err.Status() == KERN_SUCCESS) { |
| // Set the protections: |
| vm_prot_t mach_prot = VM_PROT_NONE; |
| if (permissions & eMemoryPermissionsReadable) |
| mach_prot |= VM_PROT_READ; |
| if (permissions & eMemoryPermissionsWritable) |
| mach_prot |= VM_PROT_WRITE; |
| if (permissions & eMemoryPermissionsExecutable) |
| mach_prot |= VM_PROT_EXECUTE; |
| |
| err = ::mach_vm_protect(task, addr, size, 0, mach_prot); |
| if (err.Status() == KERN_SUCCESS) { |
| m_allocations.insert(std::make_pair(addr, size)); |
| return addr; |
| } |
| ::mach_vm_deallocate(task, addr, size); |
| } |
| return INVALID_NUB_ADDRESS; |
| } |
| |
| //---------------------------------------------------------------------- |
| // MachTask::DeallocateMemory |
| //---------------------------------------------------------------------- |
| nub_bool_t MachTask::DeallocateMemory(nub_addr_t addr) { |
| task_t task = TaskPort(); |
| if (task == TASK_NULL) |
| return false; |
| |
| // We have to stash away sizes for the allocations... |
| allocation_collection::iterator pos, end = m_allocations.end(); |
| for (pos = m_allocations.begin(); pos != end; pos++) { |
| if ((*pos).first == addr) { |
| size_t size = (*pos).second; |
| m_allocations.erase(pos); |
| #define ALWAYS_ZOMBIE_ALLOCATIONS 0 |
| if (ALWAYS_ZOMBIE_ALLOCATIONS || |
| getenv("DEBUGSERVER_ZOMBIE_ALLOCATIONS")) { |
| ::mach_vm_protect(task, addr, size, 0, VM_PROT_NONE); |
| return true; |
| } else |
| return ::mach_vm_deallocate(task, addr, size) == KERN_SUCCESS; |
| } |
| } |
| return false; |
| } |
| |
| void MachTask::TaskPortChanged(task_t task) |
| { |
| m_task = task; |
| |
| // If we've just exec'd to a new process, and it |
| // is started suspended, we'll need to do two |
| // task_resume's to get the inferior process to |
| // continue. |
| if (m_exec_will_be_suspended) |
| m_do_double_resume = true; |
| else |
| m_do_double_resume = false; |
| m_exec_will_be_suspended = false; |
| } |
