2946cd7010
to reflect the new license. We understand that people may be surprised that we're moving the header entirely to discuss the new license. We checked this carefully with the Foundation's lawyer and we believe this is the correct approach. Essentially, all code in the project is now made available by the LLVM project under our new license, so you will see that the license headers include that license only. Some of our contributors have contributed code under our old license, and accordingly, we have retained a copy of our old license notice in the top-level files in each project and repository. llvm-svn: 351636
505 lines
19 KiB
C++
505 lines
19 KiB
C++
//===-- MachException.cpp ---------------------------------------*- C++ -*-===//
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//
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// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
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// See https://llvm.org/LICENSE.txt for license information.
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// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
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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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// C includes
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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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// C++ includes
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#include <mutex>
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// LLDB includes
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#include "lldb/Target/UnixSignals.h"
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#include "lldb/Utility/LLDBAssert.h"
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#include "lldb/Utility/Log.h"
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#include "lldb/Utility/Status.h"
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#include "lldb/Utility/Stream.h"
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using namespace lldb;
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using namespace lldb_private;
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using namespace lldb_private::process_darwin;
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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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static MachException::Data *g_message = NULL;
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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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// TODO change to LIBLLDB_LOG_EXCEPTION
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Log *log(GetLogIfAllCategoriesSet(LIBLLDB_LOG_PROCESS | LIBLLDB_LOG_VERBOSE));
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if (log) {
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log->Printf("::%s(exc_port = 0x%4.4x, exc_type = %d (%s), "
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"exc_data = 0x%llx, exc_data_count = %d)",
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__FUNCTION__, exc_port, exc_type, MachException::Name(exc_type),
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(uint64_t)exc_data, 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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Log *log(GetLogIfAllCategoriesSet(LIBLLDB_LOG_PROCESS | LIBLLDB_LOG_VERBOSE));
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if (log) {
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log->Printf("::%s(exc_port = 0x%4.4x, thd_port = 0x%4.4x, "
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"tsk_port = 0x%4.4x, exc_type = %d (%s), exc_data[%d] = "
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"{ 0x%llx, 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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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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Log *log(GetLogIfAllCategoriesSet(LIBLLDB_LOG_PROCESS | LIBLLDB_LOG_VERBOSE));
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if (log) {
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log->Printf("::%s(exc_port = 0x%4.4x, thd_port = 0x%4.4x, "
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"tsk_port = 0x%4.4x, exc_type = %d (%s), exc_data[%d] "
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"= { 0x%llx, 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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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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g_message->exc_data.resize(exc_data_count);
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::memcpy(&g_message->exc_data[0], exc_data,
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g_message->exc_data.size() * sizeof(mach_exception_data_type_t));
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return KERN_SUCCESS;
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}
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return KERN_FAILURE;
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}
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bool MachException::Data::GetStopInfo(struct ThreadStopInfo *stop_info,
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const UnixSignals &signals,
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Stream &stream) const {
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if (!stop_info)
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return false;
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// Zero out the structure.
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memset(stop_info, 0, sizeof(struct ThreadStopInfo));
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if (exc_type == 0) {
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stop_info->reason = eStopReasonInvalid;
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return true;
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}
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// We always stop with a mach exception.
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stop_info->reason = eStopReasonException;
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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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if (exc_name)
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stream.Printf("%s", exc_name);
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else
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stream.Printf("%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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const char *sig_str = signals.GetSignalAsCString(soft_signal);
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stream.Printf(" EXC_SOFT_SIGNAL( %i ( %s ))", soft_signal,
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sig_str ? sig_str : "unknown signal");
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} else {
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// No special disassembly for exception data, just print it.
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size_t idx;
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stream.Printf(" data[%llu] = {",
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(uint64_t)stop_info->details.exception.data_count);
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for (idx = 0; idx < stop_info->details.exception.data_count; ++idx) {
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stream.Printf(
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"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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for (size_t 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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Status 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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Status error;
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Log *log(GetLogIfAllCategoriesSet(LIBLLDB_LOG_PROCESS | LIBLLDB_LOG_VERBOSE));
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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 && ((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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log->Printf("::mach_msg(msg->{bits = %#x, size = %u remote_port = %#x, "
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"local_port = %#x, reserved = 0x%x, id = 0x%x}, "
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"option = %#x, send_size = 0, rcv_size = %llu, "
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"rcv_name = %#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,
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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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mach_msg_return_t mach_err =
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::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
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// exception on
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mach_msg_timeout, // timeout in msec (obeyed only
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// if MACH_RCV_TIMEOUT is ORed
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// into the options parameter)
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notify_port);
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error.SetError(mach_err, eErrorTypeMachKernel);
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// Dump any errors we get
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if (error.Fail() && log) {
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log->Printf("::mach_msg(msg->{bits = %#x, size = %u remote_port = %#x, "
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"local_port = %#x, reserved = 0x%x, id = 0x%x}, "
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"option = %#x, send_size = %u, rcv_size = %lu, rcv_name "
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"= %#x, timeout = %u, notify = %#x) failed: %s",
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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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error.AsCString());
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}
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return error;
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}
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void MachException::Message::Dump(Stream &stream) const {
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stream.Printf(" exc_msg { bits = 0x%8.8x size = 0x%8.8x remote-port = "
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"0x%8.8x local-port = 0x%8.8x reserved = 0x%8.8x id = "
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"0x%8.8x }\n",
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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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stream.Printf(" reply_msg { bits = 0x%8.8x size = 0x%8.8x remote-port = "
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"0x%8.8x local-port = 0x%8.8x reserved = 0x%8.8x id = "
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"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, reply_msg.hdr.msgh_local_port,
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reply_msg.hdr.msgh_reserved, reply_msg.hdr.msgh_id);
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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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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 to
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// handle messages from the kernel relating to the occurrence of an exception
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// in a thread. Such messages are delivered to the exception port set via
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// thread_set_exception_ports or task_set_exception_ports. When an exception
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// occurs in a thread, the thread sends an exception message to its exception
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// port, blocking in the kernel waiting for the receipt of a reply. The
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// exc_server function performs all necessary argument handling for this
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// kernel message and calls catch_exception_raise,
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// catch_exception_raise_state or catch_exception_raise_state_identity, which
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// should handle the exception. If the called routine returns KERN_SUCCESS, a
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// reply message will be sent, allowing the thread to continue from the point
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// of the exception; otherwise, no reply message is sent and the called
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// routine must have dealt with the exception 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 {
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Log *log(
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GetLogIfAllCategoriesSet(LIBLLDB_LOG_PROCESS | LIBLLDB_LOG_VERBOSE));
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if (log)
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log->Printf("MachException::Message::%s(): mach_exc_server "
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"returned zero...",
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__FUNCTION__);
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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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Status MachException::Message::Reply(::pid_t inferior_pid, task_t inferior_task,
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int signal) {
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// Reply to the exception...
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Status error;
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Log *log(GetLogIfAllCategoriesSet(LIBLLDB_LOG_PROCESS | LIBLLDB_LOG_VERBOSE));
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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 (inferior_task == 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 = inferior_pid;
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soft_signal = signal;
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} else {
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auto mach_err = ::pid_for_task(state.task_port, &state_pid);
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if (mach_err) {
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error.SetError(mach_err, eErrorTypeMachKernel);
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if (log)
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log->Printf("MachException::Message::%s(): pid_for_task() "
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"failed: %s",
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__FUNCTION__, error.AsCString());
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return error;
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}
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}
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lldbassert(state_pid != -1);
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if (state_pid != -1) {
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errno = 0;
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caddr_t thread_port_caddr = (caddr_t)(uintptr_t)state.thread_port;
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if (::ptrace(PT_THUPDATE, state_pid, thread_port_caddr, soft_signal) != 0)
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error.SetError(errno, eErrorTypePOSIX);
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if (!error.Success()) {
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if (log)
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log->Printf("::ptrace(request = PT_THUPDATE, pid = "
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"0x%4.4x, tid = 0x%4.4x, signal = %i)",
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state_pid, state.thread_port, soft_signal);
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return error;
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}
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}
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}
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if (log)
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log->Printf("::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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auto mach_err =
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::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 (mach_err)
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error.SetError(mach_err, eErrorTypeMachKernel);
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// Log our error if we have one.
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if (error.Fail() && log) {
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if (error.GetError() == MACH_SEND_INTERRUPTED) {
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log->PutCString("::mach_msg() - send interrupted");
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// TODO: keep retrying to reply???
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} else if (state.task_port == inferior_task) {
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log->Printf("mach_msg(): returned an error when replying "
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"to a mach exception: error = %u (%s)",
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error.GetError(), error.AsCString());
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} else {
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log->Printf("::mach_msg() - failed (child of task): %u (%s)",
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error.GetError(), error.AsCString());
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}
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}
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return error;
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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 | \
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EXC_MASK_SYSCALL | EXC_MASK_MACH_SYSCALL | EXC_MASK_RPC_ALERT | \
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EXC_MASK_MACHINE)
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// Don't listen for EXC_RESOURCE, it should really get handled by the system
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// handler.
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#ifndef EXC_RESOURCE
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#define EXC_RESOURCE 11
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#endif
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#ifndef EXC_MASK_RESOURCE
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#define EXC_MASK_RESOURCE (1 << EXC_RESOURCE)
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#endif
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#define LLDB_EXC_MASK (EXC_MASK_ALL & ~EXC_MASK_RESOURCE)
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Status MachException::PortInfo::Save(task_t task) {
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Status error;
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Log *log(GetLogIfAllCategoriesSet(LIBLLDB_LOG_PROCESS | LIBLLDB_LOG_VERBOSE));
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if (log)
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log->Printf("MachException::PortInfo::%s(task = 0x%4.4x)", __FUNCTION__,
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task);
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// Be careful to be able to have debugserver built on a newer OS than what it
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// is currently running on by being able to start with all exceptions and
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// back off to just what is supported on the current system
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mask = LLDB_EXC_MASK;
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count = (sizeof(ports) / sizeof(ports[0]));
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auto mach_err = ::task_get_exception_ports(task, mask, masks, &count, ports,
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behaviors, flavors);
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if (mach_err)
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error.SetError(mach_err, eErrorTypeMachKernel);
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if (log) {
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if (error.Success()) {
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log->Printf("::task_get_exception_ports(task = 0x%4.4x, mask = "
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"0x%x, maskCnt => %u, ports, behaviors, flavors)",
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task, mask, count);
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} else {
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log->Printf("::task_get_exception_ports(task = 0x%4.4x, mask = 0x%x, "
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"maskCnt => %u, ports, behaviors, flavors) error: %u (%s)",
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task, mask, count, error.GetError(), error.AsCString());
|
|
}
|
|
}
|
|
|
|
if ((error.GetError() == KERN_INVALID_ARGUMENT) &&
|
|
(mask != PREV_EXC_MASK_ALL)) {
|
|
mask = PREV_EXC_MASK_ALL;
|
|
count = (sizeof(ports) / sizeof(ports[0]));
|
|
mach_err = ::task_get_exception_ports(task, mask, masks, &count, ports,
|
|
behaviors, flavors);
|
|
error.SetError(mach_err, eErrorTypeMachKernel);
|
|
if (log) {
|
|
if (error.Success()) {
|
|
log->Printf("::task_get_exception_ports(task = 0x%4.4x, "
|
|
"mask = 0x%x, maskCnt => %u, ports, behaviors, "
|
|
"flavors)",
|
|
task, mask, count);
|
|
} else {
|
|
log->Printf("::task_get_exception_ports(task = 0x%4.4x, mask = "
|
|
"0x%x, maskCnt => %u, ports, behaviors, flavors) "
|
|
"error: %u (%s)",
|
|
task, mask, count, error.GetError(), error.AsCString());
|
|
}
|
|
}
|
|
}
|
|
if (error.Fail()) {
|
|
mask = 0;
|
|
count = 0;
|
|
}
|
|
return error;
|
|
}
|
|
|
|
Status MachException::PortInfo::Restore(task_t task) {
|
|
Status error;
|
|
|
|
Log *log(GetLogIfAllCategoriesSet(LIBLLDB_LOG_PROCESS | LIBLLDB_LOG_VERBOSE));
|
|
|
|
if (log)
|
|
log->Printf("MachException::PortInfo::Restore(task = 0x%4.4x)", task);
|
|
|
|
uint32_t i = 0;
|
|
if (count > 0) {
|
|
for (i = 0; i < count; i++) {
|
|
auto mach_err = ::task_set_exception_ports(task, masks[i], ports[i],
|
|
behaviors[i], flavors[i]);
|
|
if (mach_err)
|
|
error.SetError(mach_err, eErrorTypeMachKernel);
|
|
if (log) {
|
|
if (error.Success()) {
|
|
log->Printf("::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]);
|
|
} else {
|
|
log->Printf("::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): "
|
|
"error %u (%s)",
|
|
task, masks[i], ports[i], behaviors[i], flavors[i],
|
|
error.GetError(), error.AsCString());
|
|
}
|
|
}
|
|
|
|
// Bail if we encounter any errors
|
|
if (error.Fail())
|
|
break;
|
|
}
|
|
}
|
|
|
|
count = 0;
|
|
return error;
|
|
}
|
|
|
|
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;
|
|
}
|