97206d5727
This renames the LLDB error class to Status, as discussed on the lldb-dev mailing list. A change of this magnitude cannot easily be done without find and replace, but that has potential to catch unwanted occurrences of common strings such as "Error". Every effort was made to find all the obvious things such as the word "Error" appearing in a string, etc, but it's possible there are still some lingering occurences left around. Hopefully nothing too serious. llvm-svn: 302872
504 lines
20 KiB
C++
504 lines
20 KiB
C++
//===-- MachException.cpp ---------------------------------------*- C++ -*-===//
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//
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// The LLVM Compiler Infrastructure
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//
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// This file is distributed under the University of Illinois Open Source
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// License. See LICENSE.TXT for details.
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//
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//===----------------------------------------------------------------------===//
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//
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// Created by Greg Clayton on 6/18/07.
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//
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//===----------------------------------------------------------------------===//
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#include "MachException.h"
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#include "DNB.h"
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#include "DNBError.h"
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#include "DNBLog.h"
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#include "MachProcess.h"
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#include "PThreadMutex.h"
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#include "SysSignal.h"
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#include <errno.h>
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#include <sys/ptrace.h>
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#include <sys/types.h>
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// Routine mach_exception_raise
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extern "C" kern_return_t
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catch_mach_exception_raise(mach_port_t exception_port, mach_port_t thread,
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mach_port_t task, exception_type_t exception,
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mach_exception_data_t code,
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mach_msg_type_number_t codeCnt);
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extern "C" kern_return_t catch_mach_exception_raise_state(
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mach_port_t exception_port, exception_type_t exception,
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const mach_exception_data_t code, mach_msg_type_number_t codeCnt,
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int *flavor, const thread_state_t old_state,
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mach_msg_type_number_t old_stateCnt, thread_state_t new_state,
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mach_msg_type_number_t *new_stateCnt);
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// Routine mach_exception_raise_state_identity
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extern "C" kern_return_t catch_mach_exception_raise_state_identity(
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mach_port_t exception_port, mach_port_t thread, mach_port_t task,
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exception_type_t exception, mach_exception_data_t code,
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mach_msg_type_number_t codeCnt, int *flavor, thread_state_t old_state,
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mach_msg_type_number_t old_stateCnt, thread_state_t new_state,
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mach_msg_type_number_t *new_stateCnt);
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extern "C" boolean_t mach_exc_server(mach_msg_header_t *InHeadP,
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mach_msg_header_t *OutHeadP);
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// Any access to the g_message variable should be done by locking the
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// g_message_mutex first, using the g_message variable, then unlocking
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// the g_message_mutex. See MachException::Message::CatchExceptionRaise()
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// for sample code.
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static MachException::Data *g_message = NULL;
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// static pthread_mutex_t g_message_mutex = PTHREAD_MUTEX_INITIALIZER;
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extern "C" kern_return_t catch_mach_exception_raise_state(
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mach_port_t exc_port, exception_type_t exc_type,
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const mach_exception_data_t exc_data, mach_msg_type_number_t exc_data_count,
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int *flavor, const thread_state_t old_state,
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mach_msg_type_number_t old_stateCnt, thread_state_t new_state,
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mach_msg_type_number_t *new_stateCnt) {
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if (DNBLogCheckLogBit(LOG_EXCEPTIONS)) {
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DNBLogThreaded("::%s ( exc_port = 0x%4.4x, exc_type = %d ( %s ), exc_data "
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"= 0x%llx, exc_data_count = %d)",
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__FUNCTION__, exc_port, exc_type,
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MachException::Name(exc_type), (uint64_t)exc_data,
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exc_data_count);
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}
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return KERN_FAILURE;
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}
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extern "C" kern_return_t catch_mach_exception_raise_state_identity(
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mach_port_t exc_port, mach_port_t thread_port, mach_port_t task_port,
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exception_type_t exc_type, mach_exception_data_t exc_data,
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mach_msg_type_number_t exc_data_count, int *flavor,
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thread_state_t old_state, mach_msg_type_number_t old_stateCnt,
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thread_state_t new_state, mach_msg_type_number_t *new_stateCnt) {
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if (DNBLogCheckLogBit(LOG_EXCEPTIONS)) {
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DNBLogThreaded("::%s ( exc_port = 0x%4.4x, thd_port = 0x%4.4x, tsk_port = "
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"0x%4.4x, exc_type = %d ( %s ), exc_data[%d] = { 0x%llx, "
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"0x%llx })",
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__FUNCTION__, exc_port, thread_port, task_port, exc_type,
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MachException::Name(exc_type), exc_data_count,
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(uint64_t)(exc_data_count > 0 ? exc_data[0] : 0xBADDBADD),
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(uint64_t)(exc_data_count > 1 ? exc_data[1] : 0xBADDBADD));
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}
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mach_port_deallocate(mach_task_self(), task_port);
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mach_port_deallocate(mach_task_self(), thread_port);
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return KERN_FAILURE;
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}
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extern "C" kern_return_t
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catch_mach_exception_raise(mach_port_t exc_port, mach_port_t thread_port,
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mach_port_t task_port, exception_type_t exc_type,
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mach_exception_data_t exc_data,
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mach_msg_type_number_t exc_data_count) {
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if (DNBLogCheckLogBit(LOG_EXCEPTIONS)) {
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DNBLogThreaded("::%s ( exc_port = 0x%4.4x, thd_port = 0x%4.4x, tsk_port = "
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"0x%4.4x, exc_type = %d ( %s ), exc_data[%d] = { 0x%llx, "
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"0x%llx })",
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__FUNCTION__, exc_port, thread_port, task_port, exc_type,
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MachException::Name(exc_type), exc_data_count,
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(uint64_t)(exc_data_count > 0 ? exc_data[0] : 0xBADDBADD),
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(uint64_t)(exc_data_count > 1 ? exc_data[1] : 0xBADDBADD));
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}
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g_message->exc_type = 0;
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g_message->exc_data.clear();
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if (task_port == g_message->task_port) {
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g_message->task_port = task_port;
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g_message->thread_port = thread_port;
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g_message->exc_type = exc_type;
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for (mach_msg_type_number_t i=0; i<exc_data_count; ++i)
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g_message->exc_data.push_back(exc_data[i]);
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return KERN_SUCCESS;
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} else if (!MachTask::IsValid(g_message->task_port)) {
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// Our original exception port isn't valid anymore check for a SIGTRAP
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if (exc_type == EXC_SOFTWARE && exc_data_count == 2 &&
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exc_data[0] == EXC_SOFT_SIGNAL && exc_data[1] == SIGTRAP) {
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// We got a SIGTRAP which indicates we might have exec'ed and possibly
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// lost our old task port during the exec, so we just need to switch over
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// to using this new task port
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g_message->task_port = task_port;
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g_message->thread_port = thread_port;
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g_message->exc_type = exc_type;
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for (mach_msg_type_number_t i=0; i<exc_data_count; ++i)
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g_message->exc_data.push_back(exc_data[i]);
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return KERN_SUCCESS;
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}
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}
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return KERN_FAILURE;
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}
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void MachException::Message::Dump() const {
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DNBLogThreadedIf(LOG_EXCEPTIONS, " exc_msg { bits = 0x%8.8x size = 0x%8.8x "
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"remote-port = 0x%8.8x local-port = 0x%8.8x "
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"reserved = 0x%8.8x id = 0x%8.8x } ",
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exc_msg.hdr.msgh_bits, exc_msg.hdr.msgh_size,
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exc_msg.hdr.msgh_remote_port, exc_msg.hdr.msgh_local_port,
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exc_msg.hdr.msgh_reserved, exc_msg.hdr.msgh_id);
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DNBLogThreadedIf(LOG_EXCEPTIONS, "reply_msg { bits = 0x%8.8x size = 0x%8.8x "
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"remote-port = 0x%8.8x local-port = 0x%8.8x "
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"reserved = 0x%8.8x id = 0x%8.8x }",
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reply_msg.hdr.msgh_bits, reply_msg.hdr.msgh_size,
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reply_msg.hdr.msgh_remote_port,
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reply_msg.hdr.msgh_local_port, reply_msg.hdr.msgh_reserved,
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reply_msg.hdr.msgh_id);
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state.Dump();
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}
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bool MachException::Data::GetStopInfo(
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struct DNBThreadStopInfo *stop_info) const {
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// Zero out the structure.
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memset(stop_info, 0, sizeof(struct DNBThreadStopInfo));
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if (exc_type == 0) {
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stop_info->reason = eStopTypeInvalid;
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return true;
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}
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// We always stop with a mach exceptions
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stop_info->reason = eStopTypeException;
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// Save the EXC_XXXX exception type
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stop_info->details.exception.type = exc_type;
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// Fill in a text description
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const char *exc_name = MachException::Name(exc_type);
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char *desc = stop_info->description;
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const char *end_desc = desc + DNB_THREAD_STOP_INFO_MAX_DESC_LENGTH;
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if (exc_name)
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desc +=
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snprintf(desc, DNB_THREAD_STOP_INFO_MAX_DESC_LENGTH, "%s", exc_name);
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else
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desc +=
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snprintf(desc, DNB_THREAD_STOP_INFO_MAX_DESC_LENGTH, "%i", exc_type);
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stop_info->details.exception.data_count = exc_data.size();
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int soft_signal = SoftSignal();
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if (soft_signal) {
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if (desc < end_desc) {
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const char *sig_str = SysSignal::Name(soft_signal);
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snprintf(desc, end_desc - desc, " EXC_SOFT_SIGNAL( %i ( %s ))",
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soft_signal, sig_str ? sig_str : "unknown signal");
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}
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} else {
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// No special disassembly for exception data, just
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size_t idx;
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if (desc < end_desc) {
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desc += snprintf(desc, end_desc - desc, " data[%llu] = {",
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(uint64_t)stop_info->details.exception.data_count);
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for (idx = 0;
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desc < end_desc && idx < stop_info->details.exception.data_count;
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++idx)
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desc += snprintf(
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desc, end_desc - desc, "0x%llx%c", (uint64_t)exc_data[idx],
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((idx + 1 == stop_info->details.exception.data_count) ? '}' : ','));
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}
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}
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// Copy the exception data
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size_t i;
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for (i = 0; i < stop_info->details.exception.data_count; i++)
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stop_info->details.exception.data[i] = exc_data[i];
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return true;
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}
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void MachException::Data::DumpStopReason() const {
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int soft_signal = SoftSignal();
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if (soft_signal) {
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const char *signal_str = SysSignal::Name(soft_signal);
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if (signal_str)
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DNBLog("signal(%s)", signal_str);
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else
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DNBLog("signal(%i)", soft_signal);
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return;
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}
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DNBLog("%s", Name(exc_type));
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}
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kern_return_t MachException::Message::Receive(mach_port_t port,
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mach_msg_option_t options,
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mach_msg_timeout_t timeout,
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mach_port_t notify_port) {
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DNBError err;
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const bool log_exceptions = DNBLogCheckLogBit(LOG_EXCEPTIONS);
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mach_msg_timeout_t mach_msg_timeout =
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options & MACH_RCV_TIMEOUT ? timeout : 0;
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if (log_exceptions && ((options & MACH_RCV_TIMEOUT) == 0)) {
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// Dump this log message if we have no timeout in case it never returns
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DNBLogThreaded("::mach_msg ( msg->{bits = %#x, size = %u remote_port = "
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"%#x, local_port = %#x, reserved = 0x%x, id = 0x%x}, option "
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"= %#x, send_size = 0, rcv_size = %llu, rcv_name = %#x, "
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"timeout = %u, notify = %#x)",
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exc_msg.hdr.msgh_bits, exc_msg.hdr.msgh_size,
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exc_msg.hdr.msgh_remote_port, exc_msg.hdr.msgh_local_port,
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exc_msg.hdr.msgh_reserved, exc_msg.hdr.msgh_id, options,
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(uint64_t)sizeof(exc_msg.data), port, mach_msg_timeout,
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notify_port);
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}
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err = ::mach_msg(&exc_msg.hdr,
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options, // options
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0, // Send size
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sizeof(exc_msg.data), // Receive size
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port, // exception port to watch for exception on
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mach_msg_timeout, // timeout in msec (obeyed only if
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// MACH_RCV_TIMEOUT is ORed into the
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// options parameter)
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notify_port);
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// Dump any errors we get
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if (log_exceptions) {
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err.LogThreaded("::mach_msg ( msg->{bits = %#x, size = %u remote_port = "
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"%#x, local_port = %#x, reserved = 0x%x, id = 0x%x}, "
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"option = %#x, send_size = %u, rcv_size = %u, rcv_name = "
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"%#x, timeout = %u, notify = %#x)",
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exc_msg.hdr.msgh_bits, exc_msg.hdr.msgh_size,
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exc_msg.hdr.msgh_remote_port, exc_msg.hdr.msgh_local_port,
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exc_msg.hdr.msgh_reserved, exc_msg.hdr.msgh_id, options, 0,
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sizeof(exc_msg.data), port, mach_msg_timeout, notify_port);
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}
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return err.Status();
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}
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bool MachException::Message::CatchExceptionRaise(task_t task) {
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bool success = false;
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// locker will keep a mutex locked until it goes out of scope
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// PThreadMutex::Locker locker(&g_message_mutex);
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// DNBLogThreaded("calling mach_exc_server");
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state.task_port = task;
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g_message = &state;
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// The exc_server function is the MIG generated server handling function
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// to handle messages from the kernel relating to the occurrence of an
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// exception in a thread. Such messages are delivered to the exception port
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// set via thread_set_exception_ports or task_set_exception_ports. When an
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// exception occurs in a thread, the thread sends an exception message to
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// its exception port, blocking in the kernel waiting for the receipt of a
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// reply. The exc_server function performs all necessary argument handling
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// for this kernel message and calls catch_exception_raise,
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// catch_exception_raise_state or catch_exception_raise_state_identity,
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// which should handle the exception. If the called routine returns
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// KERN_SUCCESS, a reply message will be sent, allowing the thread to
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// continue from the point of the exception; otherwise, no reply message
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// is sent and the called routine must have dealt with the exception
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// thread directly.
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if (mach_exc_server(&exc_msg.hdr, &reply_msg.hdr)) {
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success = true;
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} else if (DNBLogCheckLogBit(LOG_EXCEPTIONS)) {
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DNBLogThreaded("mach_exc_server returned zero...");
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}
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g_message = NULL;
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return success;
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}
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kern_return_t MachException::Message::Reply(MachProcess *process, int signal) {
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// Reply to the exception...
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DNBError err;
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// If we had a soft signal, we need to update the thread first so it can
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// continue without signaling
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int soft_signal = state.SoftSignal();
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if (soft_signal) {
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int state_pid = -1;
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if (process->Task().TaskPort() == state.task_port) {
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// This is our task, so we can update the signal to send to it
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state_pid = process->ProcessID();
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soft_signal = signal;
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} else {
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err = ::pid_for_task(state.task_port, &state_pid);
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}
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assert(state_pid != -1);
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if (state_pid != -1) {
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errno = 0;
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if (::ptrace(PT_THUPDATE, state_pid,
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(caddr_t)((uintptr_t)state.thread_port), soft_signal) != 0)
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err.SetError(errno, DNBError::POSIX);
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else
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err.Clear();
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if (DNBLogCheckLogBit(LOG_EXCEPTIONS) || err.Fail())
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err.LogThreaded("::ptrace (request = PT_THUPDATE, pid = 0x%4.4x, tid = "
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"0x%4.4x, signal = %i)",
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state_pid, state.thread_port, soft_signal);
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}
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}
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DNBLogThreadedIf(
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LOG_EXCEPTIONS, "::mach_msg ( msg->{bits = %#x, size = %u, remote_port = "
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"%#x, local_port = %#x, reserved = 0x%x, id = 0x%x}, "
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"option = %#x, send_size = %u, rcv_size = %u, rcv_name = "
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"%#x, timeout = %u, notify = %#x)",
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reply_msg.hdr.msgh_bits, reply_msg.hdr.msgh_size,
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reply_msg.hdr.msgh_remote_port, reply_msg.hdr.msgh_local_port,
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reply_msg.hdr.msgh_reserved, reply_msg.hdr.msgh_id,
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MACH_SEND_MSG | MACH_SEND_INTERRUPT, reply_msg.hdr.msgh_size, 0,
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MACH_PORT_NULL, MACH_MSG_TIMEOUT_NONE, MACH_PORT_NULL);
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err = ::mach_msg(&reply_msg.hdr, MACH_SEND_MSG | MACH_SEND_INTERRUPT,
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reply_msg.hdr.msgh_size, 0, MACH_PORT_NULL,
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MACH_MSG_TIMEOUT_NONE, MACH_PORT_NULL);
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if (err.Fail()) {
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if (err.Status() == MACH_SEND_INTERRUPTED) {
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if (DNBLogCheckLogBit(LOG_EXCEPTIONS))
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err.LogThreaded("::mach_msg() - send interrupted");
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// TODO: keep retrying to reply???
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} else {
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if (state.task_port == process->Task().TaskPort()) {
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DNBLogThreaded("error: mach_msg() returned an error when replying to a "
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"mach exception: error = %u",
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err.Status());
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} else {
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if (DNBLogCheckLogBit(LOG_EXCEPTIONS))
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err.LogThreaded("::mach_msg() - failed (child of task)");
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}
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}
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}
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return err.Status();
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}
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void MachException::Data::Dump() const {
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const char *exc_type_name = MachException::Name(exc_type);
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DNBLogThreadedIf(
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LOG_EXCEPTIONS, " state { task_port = 0x%4.4x, thread_port = "
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"0x%4.4x, exc_type = %i (%s) ...",
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task_port, thread_port, exc_type, exc_type_name ? exc_type_name : "???");
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const size_t exc_data_count = exc_data.size();
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// Dump any special exception data contents
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int soft_signal = SoftSignal();
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if (soft_signal != 0) {
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const char *sig_str = SysSignal::Name(soft_signal);
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DNBLogThreadedIf(LOG_EXCEPTIONS,
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" exc_data: EXC_SOFT_SIGNAL (%i (%s))",
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soft_signal, sig_str ? sig_str : "unknown signal");
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} else {
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// No special disassembly for this data, just dump the data
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size_t idx;
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for (idx = 0; idx < exc_data_count; ++idx) {
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DNBLogThreadedIf(LOG_EXCEPTIONS, " exc_data[%llu]: 0x%llx",
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(uint64_t)idx, (uint64_t)exc_data[idx]);
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}
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}
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}
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#define PREV_EXC_MASK_ALL \
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(EXC_MASK_BAD_ACCESS | EXC_MASK_BAD_INSTRUCTION | EXC_MASK_ARITHMETIC | \
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EXC_MASK_EMULATION | EXC_MASK_SOFTWARE | EXC_MASK_BREAKPOINT | \
|
|
EXC_MASK_SYSCALL | EXC_MASK_MACH_SYSCALL | EXC_MASK_RPC_ALERT | \
|
|
EXC_MASK_MACHINE)
|
|
|
|
// Don't listen for EXC_RESOURCE, it should really get handled by the system
|
|
// handler.
|
|
|
|
#ifndef EXC_RESOURCE
|
|
#define EXC_RESOURCE 11
|
|
#endif
|
|
|
|
#ifndef EXC_MASK_RESOURCE
|
|
#define EXC_MASK_RESOURCE (1 << EXC_RESOURCE)
|
|
#endif
|
|
|
|
#define LLDB_EXC_MASK (EXC_MASK_ALL & ~EXC_MASK_RESOURCE)
|
|
|
|
kern_return_t MachException::PortInfo::Save(task_t task) {
|
|
DNBLogThreadedIf(LOG_EXCEPTIONS | LOG_VERBOSE,
|
|
"MachException::PortInfo::Save ( task = 0x%4.4x )", task);
|
|
// Be careful to be able to have debugserver built on a newer OS than what
|
|
// it is currently running on by being able to start with all exceptions
|
|
// and back off to just what is supported on the current system
|
|
DNBError err;
|
|
|
|
mask = LLDB_EXC_MASK;
|
|
|
|
count = (sizeof(ports) / sizeof(ports[0]));
|
|
err = ::task_get_exception_ports(task, mask, masks, &count, ports, behaviors,
|
|
flavors);
|
|
if (DNBLogCheckLogBit(LOG_EXCEPTIONS) || err.Fail())
|
|
err.LogThreaded("::task_get_exception_ports ( task = 0x%4.4x, mask = 0x%x, "
|
|
"maskCnt => %u, ports, behaviors, flavors )",
|
|
task, mask, count);
|
|
|
|
if (err.Status() == KERN_INVALID_ARGUMENT && mask != PREV_EXC_MASK_ALL) {
|
|
mask = PREV_EXC_MASK_ALL;
|
|
count = (sizeof(ports) / sizeof(ports[0]));
|
|
err = ::task_get_exception_ports(task, mask, masks, &count, ports,
|
|
behaviors, flavors);
|
|
if (DNBLogCheckLogBit(LOG_EXCEPTIONS) || err.Fail())
|
|
err.LogThreaded("::task_get_exception_ports ( task = 0x%4.4x, mask = "
|
|
"0x%x, maskCnt => %u, ports, behaviors, flavors )",
|
|
task, mask, count);
|
|
}
|
|
if (err.Fail()) {
|
|
mask = 0;
|
|
count = 0;
|
|
}
|
|
return err.Status();
|
|
}
|
|
|
|
kern_return_t MachException::PortInfo::Restore(task_t task) {
|
|
DNBLogThreadedIf(LOG_EXCEPTIONS | LOG_VERBOSE,
|
|
"MachException::PortInfo::Restore( task = 0x%4.4x )", task);
|
|
uint32_t i = 0;
|
|
DNBError err;
|
|
if (count > 0) {
|
|
for (i = 0; i < count; i++) {
|
|
err = ::task_set_exception_ports(task, masks[i], ports[i], behaviors[i],
|
|
flavors[i]);
|
|
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, masks[i], ports[i], behaviors[i], flavors[i]);
|
|
// Bail if we encounter any errors
|
|
}
|
|
|
|
if (err.Fail())
|
|
break;
|
|
}
|
|
}
|
|
count = 0;
|
|
return err.Status();
|
|
}
|
|
|
|
const char *MachException::Name(exception_type_t exc_type) {
|
|
switch (exc_type) {
|
|
case EXC_BAD_ACCESS:
|
|
return "EXC_BAD_ACCESS";
|
|
case EXC_BAD_INSTRUCTION:
|
|
return "EXC_BAD_INSTRUCTION";
|
|
case EXC_ARITHMETIC:
|
|
return "EXC_ARITHMETIC";
|
|
case EXC_EMULATION:
|
|
return "EXC_EMULATION";
|
|
case EXC_SOFTWARE:
|
|
return "EXC_SOFTWARE";
|
|
case EXC_BREAKPOINT:
|
|
return "EXC_BREAKPOINT";
|
|
case EXC_SYSCALL:
|
|
return "EXC_SYSCALL";
|
|
case EXC_MACH_SYSCALL:
|
|
return "EXC_MACH_SYSCALL";
|
|
case EXC_RPC_ALERT:
|
|
return "EXC_RPC_ALERT";
|
|
#ifdef EXC_CRASH
|
|
case EXC_CRASH:
|
|
return "EXC_CRASH";
|
|
#endif
|
|
default:
|
|
break;
|
|
}
|
|
return NULL;
|
|
}
|