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llvm-project/lldb/source/Plugins/Process/FreeBSD/ProcessFreeBSD.cpp

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//===-- ProcessFreeBSD.cpp ----------------------------------------*- C++
//-*-===//
//
// The LLVM Compiler Infrastructure
//
// This file is distributed under the University of Illinois Open Source
// License. See LICENSE.TXT for details.
//
//===----------------------------------------------------------------------===//
// C Includes
#include <errno.h>
#include <pthread.h>
#include <pthread_np.h>
#include <stdlib.h>
#include <sys/sysctl.h>
#include <sys/types.h>
#include <sys/user.h>
#include <machine/elf.h>
// C++ Includes
#include <mutex>
#include <unordered_map>
// Other libraries and framework includes
#include "lldb/Core/PluginManager.h"
#include "lldb/Core/RegisterValue.h"
#include "lldb/Core/State.h"
#include "lldb/Host/Host.h"
#include "lldb/Symbol/ObjectFile.h"
#include "lldb/Target/DynamicLoader.h"
#include "lldb/Target/Target.h"
#include "FreeBSDThread.h"
#include "Plugins/Process/POSIX/ProcessPOSIXLog.h"
#include "Plugins/Process/Utility/FreeBSDSignals.h"
#include "Plugins/Process/Utility/InferiorCallPOSIX.h"
#include "ProcessFreeBSD.h"
#include "ProcessMonitor.h"
// Other libraries and framework includes
#include "lldb/Breakpoint/BreakpointLocation.h"
#include "lldb/Breakpoint/Watchpoint.h"
#include "lldb/Core/Module.h"
#include "lldb/Core/ModuleSpec.h"
#include "lldb/Core/PluginManager.h"
#include "lldb/Core/State.h"
#include "lldb/Host/Host.h"
#include "lldb/Symbol/ObjectFile.h"
#include "lldb/Target/DynamicLoader.h"
#include "lldb/Target/Platform.h"
#include "lldb/Target/Target.h"
#include "lldb/Utility/DataBufferHeap.h"
#include "lldb/Utility/FileSpec.h"
#include "lldb/Host/posix/Fcntl.h"
#include "llvm/Support/FileSystem.h"
#include "llvm/Support/Threading.h"
using namespace lldb;
using namespace lldb_private;
namespace {
UnixSignalsSP &GetFreeBSDSignals() {
static UnixSignalsSP s_freebsd_signals_sp(new FreeBSDSignals());
return s_freebsd_signals_sp;
}
}
//------------------------------------------------------------------------------
// Static functions.
lldb::ProcessSP
ProcessFreeBSD::CreateInstance(lldb::TargetSP target_sp,
lldb::ListenerSP listener_sp,
const FileSpec *crash_file_path) {
lldb::ProcessSP process_sp;
if (crash_file_path == NULL)
process_sp.reset(
new ProcessFreeBSD(target_sp, listener_sp, GetFreeBSDSignals()));
return process_sp;
}
void ProcessFreeBSD::Initialize() {
static llvm::once_flag g_once_flag;
llvm::call_once(g_once_flag, []() {
PluginManager::RegisterPlugin(GetPluginNameStatic(),
GetPluginDescriptionStatic(), CreateInstance);
});
}
lldb_private::ConstString ProcessFreeBSD::GetPluginNameStatic() {
static ConstString g_name("freebsd");
return g_name;
}
const char *ProcessFreeBSD::GetPluginDescriptionStatic() {
return "Process plugin for FreeBSD";
}
//------------------------------------------------------------------------------
// ProcessInterface protocol.
lldb_private::ConstString ProcessFreeBSD::GetPluginName() {
return GetPluginNameStatic();
}
uint32_t ProcessFreeBSD::GetPluginVersion() { return 1; }
void ProcessFreeBSD::Terminate() {}
Status ProcessFreeBSD::DoDetach(bool keep_stopped) {
Status error;
if (keep_stopped) {
error.SetErrorString("Detaching with keep_stopped true is not currently "
"supported on FreeBSD.");
return error;
}
error = m_monitor->Detach(GetID());
if (error.Success())
SetPrivateState(eStateDetached);
return error;
}
Status ProcessFreeBSD::DoResume() {
Log *log(ProcessPOSIXLog::GetLogIfAllCategoriesSet(POSIX_LOG_PROCESS));
SetPrivateState(eStateRunning);
std::lock_guard<std::recursive_mutex> guard(m_thread_list.GetMutex());
bool do_step = false;
bool software_single_step = !SupportHardwareSingleStepping();
for (tid_collection::const_iterator t_pos = m_run_tids.begin(),
t_end = m_run_tids.end();
t_pos != t_end; ++t_pos) {
m_monitor->ThreadSuspend(*t_pos, false);
}
for (tid_collection::const_iterator t_pos = m_step_tids.begin(),
t_end = m_step_tids.end();
t_pos != t_end; ++t_pos) {
m_monitor->ThreadSuspend(*t_pos, false);
do_step = true;
if (software_single_step) {
Status error = SetupSoftwareSingleStepping(*t_pos);
if (error.Fail())
return error;
}
}
for (tid_collection::const_iterator t_pos = m_suspend_tids.begin(),
t_end = m_suspend_tids.end();
t_pos != t_end; ++t_pos) {
m_monitor->ThreadSuspend(*t_pos, true);
// XXX Cannot PT_CONTINUE properly with suspended threads.
do_step = true;
}
if (log)
log->Printf("process %" PRIu64 " resuming (%s)", GetID(),
do_step ? "step" : "continue");
if (do_step && !software_single_step)
m_monitor->SingleStep(GetID(), m_resume_signo);
else
m_monitor->Resume(GetID(), m_resume_signo);
return Status();
}
bool ProcessFreeBSD::UpdateThreadList(ThreadList &old_thread_list,
ThreadList &new_thread_list) {
Log *log(ProcessPOSIXLog::GetLogIfAllCategoriesSet(POSIX_LOG_PROCESS));
if (log)
log->Printf("ProcessFreeBSD::%s (pid = %" PRIu64 ")", __FUNCTION__,
GetID());
std::vector<lldb::pid_t> tds;
if (!GetMonitor().GetCurrentThreadIDs(tds)) {
return false;
}
ThreadList old_thread_list_copy(old_thread_list);
for (size_t i = 0; i < tds.size(); ++i) {
tid_t tid = tds[i];
ThreadSP thread_sp(old_thread_list_copy.RemoveThreadByID(tid, false));
if (!thread_sp) {
thread_sp.reset(new FreeBSDThread(*this, tid));
if (log)
log->Printf("ProcessFreeBSD::%s new tid = %" PRIu64, __FUNCTION__, tid);
} else {
if (log)
log->Printf("ProcessFreeBSD::%s existing tid = %" PRIu64, __FUNCTION__,
tid);
}
new_thread_list.AddThread(thread_sp);
}
for (size_t i = 0; i < old_thread_list_copy.GetSize(false); ++i) {
ThreadSP old_thread_sp(old_thread_list_copy.GetThreadAtIndex(i, false));
if (old_thread_sp) {
if (log)
log->Printf("ProcessFreeBSD::%s remove tid", __FUNCTION__);
}
}
return true;
}
Status ProcessFreeBSD::WillResume() {
m_resume_signo = 0;
m_suspend_tids.clear();
m_run_tids.clear();
m_step_tids.clear();
return Process::WillResume();
}
void ProcessFreeBSD::SendMessage(const ProcessMessage &message) {
std::lock_guard<std::recursive_mutex> guard(m_message_mutex);
switch (message.GetKind()) {
case ProcessMessage::eInvalidMessage:
return;
case ProcessMessage::eAttachMessage:
SetPrivateState(eStateStopped);
return;
case ProcessMessage::eLimboMessage:
case ProcessMessage::eExitMessage:
SetExitStatus(message.GetExitStatus(), NULL);
break;
case ProcessMessage::eSignalMessage:
case ProcessMessage::eSignalDeliveredMessage:
case ProcessMessage::eBreakpointMessage:
case ProcessMessage::eTraceMessage:
case ProcessMessage::eWatchpointMessage:
case ProcessMessage::eCrashMessage:
SetPrivateState(eStateStopped);
break;
case ProcessMessage::eNewThreadMessage:
llvm_unreachable("eNewThreadMessage unexpected on FreeBSD");
break;
case ProcessMessage::eExecMessage:
SetPrivateState(eStateStopped);
break;
}
m_message_queue.push(message);
}
//------------------------------------------------------------------------------
// Constructors and destructors.
ProcessFreeBSD::ProcessFreeBSD(lldb::TargetSP target_sp,
lldb::ListenerSP listener_sp,
UnixSignalsSP &unix_signals_sp)
: Process(target_sp, listener_sp, unix_signals_sp),
m_byte_order(endian::InlHostByteOrder()), m_monitor(NULL), m_module(NULL),
m_message_mutex(), m_exit_now(false), m_seen_initial_stop(),
m_resume_signo(0) {
// FIXME: Putting this code in the ctor and saving the byte order in a
// member variable is a hack to avoid const qual issues in GetByteOrder.
lldb::ModuleSP module = GetTarget().GetExecutableModule();
if (module && module->GetObjectFile())
m_byte_order = module->GetObjectFile()->GetByteOrder();
}
ProcessFreeBSD::~ProcessFreeBSD() { delete m_monitor; }
//------------------------------------------------------------------------------
// Process protocol.
void ProcessFreeBSD::Finalize() {
Process::Finalize();
if (m_monitor)
m_monitor->StopMonitor();
}
bool ProcessFreeBSD::CanDebug(lldb::TargetSP target_sp,
bool plugin_specified_by_name) {
// For now we are just making sure the file exists for a given module
ModuleSP exe_module_sp(target_sp->GetExecutableModule());
if (exe_module_sp.get())
return exe_module_sp->GetFileSpec().Exists();
// If there is no executable module, we return true since we might be
// preparing to attach.
return true;
}
Status
ProcessFreeBSD::DoAttachToProcessWithID(lldb::pid_t pid,
const ProcessAttachInfo &attach_info) {
Status error;
assert(m_monitor == NULL);
Log *log(ProcessPOSIXLog::GetLogIfAllCategoriesSet(POSIX_LOG_PROCESS));
LLDB_LOGV(log, "pid = {0}", GetID());
m_monitor = new ProcessMonitor(this, pid, error);
if (!error.Success())
return error;
PlatformSP platform_sp(GetTarget().GetPlatform());
assert(platform_sp.get());
if (!platform_sp)
return error; // FIXME: Detatch?
// Find out what we can about this process
ProcessInstanceInfo process_info;
platform_sp->GetProcessInfo(pid, process_info);
// Resolve the executable module
ModuleSP exe_module_sp;
FileSpecList executable_search_paths(
Target::GetDefaultExecutableSearchPaths());
ModuleSpec exe_module_spec(process_info.GetExecutableFile(),
GetTarget().GetArchitecture());
error = platform_sp->ResolveExecutable(
exe_module_spec, exe_module_sp,
executable_search_paths.GetSize() ? &executable_search_paths : NULL);
if (!error.Success())
return error;
// Fix the target architecture if necessary
const ArchSpec &module_arch = exe_module_sp->GetArchitecture();
if (module_arch.IsValid() &&
!GetTarget().GetArchitecture().IsExactMatch(module_arch))
GetTarget().SetArchitecture(module_arch);
// Initialize the target module list
GetTarget().SetExecutableModule(exe_module_sp, true);
SetSTDIOFileDescriptor(m_monitor->GetTerminalFD());
SetID(pid);
return error;
}
Status ProcessFreeBSD::WillLaunch(Module *module) {
Status error;
return error;
}
FileSpec
ProcessFreeBSD::GetFileSpec(const lldb_private::FileAction *file_action,
const FileSpec &default_file_spec,
const FileSpec &dbg_pts_file_spec) {
FileSpec file_spec{};
if (file_action && file_action->GetAction() == FileAction::eFileActionOpen) {
file_spec = file_action->GetFileSpec();
// By default the stdio paths passed in will be pseudo-terminal
// (/dev/pts). If so, convert to using a different default path
// instead to redirect I/O to the debugger console. This should
// also handle user overrides to /dev/null or a different file.
if (!file_spec || file_spec == dbg_pts_file_spec)
file_spec = default_file_spec;
}
return file_spec;
}
Status ProcessFreeBSD::DoLaunch(Module *module,
ProcessLaunchInfo &launch_info) {
Status error;
assert(m_monitor == NULL);
FileSpec working_dir = launch_info.GetWorkingDirectory();
namespace fs = llvm::sys::fs;
if (working_dir && (!working_dir.ResolvePath() ||
!fs::is_directory(working_dir.GetPath()))) {
error.SetErrorStringWithFormat("No such file or directory: %s",
working_dir.GetCString());
return error;
}
SetPrivateState(eStateLaunching);
const lldb_private::FileAction *file_action;
// Default of empty will mean to use existing open file descriptors
FileSpec stdin_file_spec{};
FileSpec stdout_file_spec{};
FileSpec stderr_file_spec{};
const FileSpec dbg_pts_file_spec{launch_info.GetPTY().GetSlaveName(NULL, 0),
false};
file_action = launch_info.GetFileActionForFD(STDIN_FILENO);
stdin_file_spec =
GetFileSpec(file_action, stdin_file_spec, dbg_pts_file_spec);
file_action = launch_info.GetFileActionForFD(STDOUT_FILENO);
stdout_file_spec =
GetFileSpec(file_action, stdout_file_spec, dbg_pts_file_spec);
file_action = launch_info.GetFileActionForFD(STDERR_FILENO);
stderr_file_spec =
GetFileSpec(file_action, stderr_file_spec, dbg_pts_file_spec);
m_monitor = new ProcessMonitor(
this, module, launch_info.GetArguments().GetConstArgumentVector(),
launch_info.GetEnvironmentEntries().GetConstArgumentVector(),
stdin_file_spec, stdout_file_spec, stderr_file_spec, working_dir,
launch_info, error);
m_module = module;
if (!error.Success())
return error;
int terminal = m_monitor->GetTerminalFD();
if (terminal >= 0) {
// The reader thread will close the file descriptor when done, so we pass it a
// copy.
#ifdef F_DUPFD_CLOEXEC
int stdio = fcntl(terminal, F_DUPFD_CLOEXEC, 0);
if (stdio == -1) {
error.SetErrorToErrno();
return error;
}
#else
// Special case when F_DUPFD_CLOEXEC does not exist (Debian kFreeBSD)
int stdio = fcntl(terminal, F_DUPFD, 0);
if (stdio == -1) {
error.SetErrorToErrno();
return error;
}
stdio = fcntl(terminal, F_SETFD, FD_CLOEXEC);
if (stdio == -1) {
error.SetErrorToErrno();
return error;
}
#endif
SetSTDIOFileDescriptor(stdio);
}
SetID(m_monitor->GetPID());
return error;
}
void ProcessFreeBSD::DidLaunch() {}
addr_t ProcessFreeBSD::GetImageInfoAddress() {
Target *target = &GetTarget();
ObjectFile *obj_file = target->GetExecutableModule()->GetObjectFile();
Address addr = obj_file->GetImageInfoAddress(target);
if (addr.IsValid())
return addr.GetLoadAddress(target);
return LLDB_INVALID_ADDRESS;
}
Status ProcessFreeBSD::DoHalt(bool &caused_stop) {
Status error;
if (IsStopped()) {
caused_stop = false;
} else if (kill(GetID(), SIGSTOP)) {
caused_stop = false;
error.SetErrorToErrno();
} else {
caused_stop = true;
}
return error;
}
Status ProcessFreeBSD::DoSignal(int signal) {
Status error;
if (kill(GetID(), signal))
error.SetErrorToErrno();
return error;
}
Status ProcessFreeBSD::DoDestroy() {
Status error;
if (!HasExited()) {
assert(m_monitor);
m_exit_now = true;
if (GetID() == LLDB_INVALID_PROCESS_ID) {
error.SetErrorString("invalid process id");
return error;
}
if (!m_monitor->Kill()) {
error.SetErrorToErrno();
return error;
}
SetPrivateState(eStateExited);
}
return error;
}
void ProcessFreeBSD::DoDidExec() {
Target *target = &GetTarget();
if (target) {
PlatformSP platform_sp(target->GetPlatform());
assert(platform_sp.get());
if (platform_sp) {
ProcessInstanceInfo process_info;
platform_sp->GetProcessInfo(GetID(), process_info);
ModuleSP exe_module_sp;
ModuleSpec exe_module_spec(process_info.GetExecutableFile(),
target->GetArchitecture());
FileSpecList executable_search_paths(
Target::GetDefaultExecutableSearchPaths());
Status error = platform_sp->ResolveExecutable(
exe_module_spec, exe_module_sp,
executable_search_paths.GetSize() ? &executable_search_paths : NULL);
if (!error.Success())
return;
target->SetExecutableModule(exe_module_sp, true);
}
}
}
bool ProcessFreeBSD::AddThreadForInitialStopIfNeeded(lldb::tid_t stop_tid) {
bool added_to_set = false;
ThreadStopSet::iterator it = m_seen_initial_stop.find(stop_tid);
if (it == m_seen_initial_stop.end()) {
m_seen_initial_stop.insert(stop_tid);
added_to_set = true;
}
return added_to_set;
}
bool ProcessFreeBSD::WaitingForInitialStop(lldb::tid_t stop_tid) {
return (m_seen_initial_stop.find(stop_tid) == m_seen_initial_stop.end());
}
FreeBSDThread *
ProcessFreeBSD::CreateNewFreeBSDThread(lldb_private::Process &process,
lldb::tid_t tid) {
return new FreeBSDThread(process, tid);
}
void ProcessFreeBSD::RefreshStateAfterStop() {
Log *log(ProcessPOSIXLog::GetLogIfAllCategoriesSet(POSIX_LOG_PROCESS));
LLDB_LOGV(log, "message_queue size = {0}", m_message_queue.size());
std::lock_guard<std::recursive_mutex> guard(m_message_mutex);
// This method used to only handle one message. Changing it to loop allows
// it to handle the case where we hit a breakpoint while handling a different
// breakpoint.
while (!m_message_queue.empty()) {
ProcessMessage &message = m_message_queue.front();
// Resolve the thread this message corresponds to and pass it along.
lldb::tid_t tid = message.GetTID();
LLDB_LOGV(log, " message_queue size = {0}, pid = {1}",
m_message_queue.size(), tid);
m_thread_list.RefreshStateAfterStop();
FreeBSDThread *thread = static_cast<FreeBSDThread *>(
GetThreadList().FindThreadByID(tid, false).get());
if (thread)
thread->Notify(message);
if (message.GetKind() == ProcessMessage::eExitMessage) {
// FIXME: We should tell the user about this, but the limbo message is
// probably better for that.
LLDB_LOG(log, "removing thread, tid = {0}", tid);
std::lock_guard<std::recursive_mutex> guard(m_thread_list.GetMutex());
ThreadSP thread_sp = m_thread_list.RemoveThreadByID(tid, false);
thread_sp.reset();
m_seen_initial_stop.erase(tid);
}
m_message_queue.pop();
}
}
bool ProcessFreeBSD::IsAlive() {
StateType state = GetPrivateState();
return state != eStateDetached && state != eStateExited &&
state != eStateInvalid && state != eStateUnloaded;
}
size_t ProcessFreeBSD::DoReadMemory(addr_t vm_addr, void *buf, size_t size,
Status &error) {
assert(m_monitor);
return m_monitor->ReadMemory(vm_addr, buf, size, error);
}
size_t ProcessFreeBSD::DoWriteMemory(addr_t vm_addr, const void *buf,
size_t size, Status &error) {
assert(m_monitor);
return m_monitor->WriteMemory(vm_addr, buf, size, error);
}
addr_t ProcessFreeBSD::DoAllocateMemory(size_t size, uint32_t permissions,
Status &error) {
addr_t allocated_addr = LLDB_INVALID_ADDRESS;
unsigned prot = 0;
if (permissions & lldb::ePermissionsReadable)
prot |= eMmapProtRead;
if (permissions & lldb::ePermissionsWritable)
prot |= eMmapProtWrite;
if (permissions & lldb::ePermissionsExecutable)
prot |= eMmapProtExec;
if (InferiorCallMmap(this, allocated_addr, 0, size, prot,
eMmapFlagsAnon | eMmapFlagsPrivate, -1, 0)) {
m_addr_to_mmap_size[allocated_addr] = size;
error.Clear();
} else {
allocated_addr = LLDB_INVALID_ADDRESS;
error.SetErrorStringWithFormat(
"unable to allocate %zu bytes of memory with permissions %s", size,
GetPermissionsAsCString(permissions));
}
return allocated_addr;
}
Status ProcessFreeBSD::DoDeallocateMemory(lldb::addr_t addr) {
Status error;
MMapMap::iterator pos = m_addr_to_mmap_size.find(addr);
if (pos != m_addr_to_mmap_size.end() &&
InferiorCallMunmap(this, addr, pos->second))
m_addr_to_mmap_size.erase(pos);
else
error.SetErrorStringWithFormat("unable to deallocate memory at 0x%" PRIx64,
addr);
return error;
}
size_t
ProcessFreeBSD::GetSoftwareBreakpointTrapOpcode(BreakpointSite *bp_site) {
static const uint8_t g_aarch64_opcode[] = {0x00, 0x00, 0x20, 0xD4};
static const uint8_t g_i386_opcode[] = {0xCC};
ArchSpec arch = GetTarget().GetArchitecture();
const uint8_t *opcode = NULL;
size_t opcode_size = 0;
switch (arch.GetMachine()) {
default:
assert(false && "CPU type not supported!");
break;
case llvm::Triple::arm: {
// The ARM reference recommends the use of 0xe7fddefe and 0xdefe
// but the linux kernel does otherwise.
static const uint8_t g_arm_breakpoint_opcode[] = {0xf0, 0x01, 0xf0, 0xe7};
static const uint8_t g_thumb_breakpoint_opcode[] = {0x01, 0xde};
lldb::BreakpointLocationSP bp_loc_sp(bp_site->GetOwnerAtIndex(0));
AddressClass addr_class = eAddressClassUnknown;
if (bp_loc_sp)
addr_class = bp_loc_sp->GetAddress().GetAddressClass();
if (addr_class == eAddressClassCodeAlternateISA ||
(addr_class == eAddressClassUnknown &&
bp_loc_sp->GetAddress().GetOffset() & 1)) {
opcode = g_thumb_breakpoint_opcode;
opcode_size = sizeof(g_thumb_breakpoint_opcode);
} else {
opcode = g_arm_breakpoint_opcode;
opcode_size = sizeof(g_arm_breakpoint_opcode);
}
} break;
case llvm::Triple::aarch64:
opcode = g_aarch64_opcode;
opcode_size = sizeof(g_aarch64_opcode);
break;
case llvm::Triple::x86:
case llvm::Triple::x86_64:
opcode = g_i386_opcode;
opcode_size = sizeof(g_i386_opcode);
break;
}
bp_site->SetTrapOpcode(opcode, opcode_size);
return opcode_size;
}
Status ProcessFreeBSD::EnableBreakpointSite(BreakpointSite *bp_site) {
return EnableSoftwareBreakpoint(bp_site);
}
Status ProcessFreeBSD::DisableBreakpointSite(BreakpointSite *bp_site) {
return DisableSoftwareBreakpoint(bp_site);
}
Status ProcessFreeBSD::EnableWatchpoint(Watchpoint *wp, bool notify) {
Status error;
if (wp) {
user_id_t watchID = wp->GetID();
addr_t addr = wp->GetLoadAddress();
Log *log(ProcessPOSIXLog::GetLogIfAllCategoriesSet(POSIX_LOG_WATCHPOINTS));
if (log)
log->Printf("ProcessFreeBSD::EnableWatchpoint(watchID = %" PRIu64 ")",
watchID);
if (wp->IsEnabled()) {
if (log)
log->Printf("ProcessFreeBSD::EnableWatchpoint(watchID = %" PRIu64
") addr = 0x%8.8" PRIx64 ": watchpoint already enabled.",
watchID, (uint64_t)addr);
return error;
}
// Try to find a vacant watchpoint slot in the inferiors' main thread
uint32_t wp_hw_index = LLDB_INVALID_INDEX32;
std::lock_guard<std::recursive_mutex> guard(m_thread_list.GetMutex());
FreeBSDThread *thread = static_cast<FreeBSDThread *>(
m_thread_list.GetThreadAtIndex(0, false).get());
if (thread)
wp_hw_index = thread->FindVacantWatchpointIndex();
if (wp_hw_index == LLDB_INVALID_INDEX32) {
error.SetErrorString("Setting hardware watchpoint failed.");
} else {
wp->SetHardwareIndex(wp_hw_index);
bool wp_enabled = true;
uint32_t thread_count = m_thread_list.GetSize(false);
for (uint32_t i = 0; i < thread_count; ++i) {
thread = static_cast<FreeBSDThread *>(
m_thread_list.GetThreadAtIndex(i, false).get());
if (thread)
wp_enabled &= thread->EnableHardwareWatchpoint(wp);
else
wp_enabled = false;
}
if (wp_enabled) {
wp->SetEnabled(true, notify);
return error;
} else {
// Watchpoint enabling failed on at least one
// of the threads so roll back all of them
DisableWatchpoint(wp, false);
error.SetErrorString("Setting hardware watchpoint failed");
}
}
} else
error.SetErrorString("Watchpoint argument was NULL.");
return error;
}
Status ProcessFreeBSD::DisableWatchpoint(Watchpoint *wp, bool notify) {
Status error;
if (wp) {
user_id_t watchID = wp->GetID();
addr_t addr = wp->GetLoadAddress();
Log *log(ProcessPOSIXLog::GetLogIfAllCategoriesSet(POSIX_LOG_WATCHPOINTS));
if (log)
log->Printf("ProcessFreeBSD::DisableWatchpoint(watchID = %" PRIu64 ")",
watchID);
if (!wp->IsEnabled()) {
if (log)
log->Printf("ProcessFreeBSD::DisableWatchpoint(watchID = %" PRIu64
") addr = 0x%8.8" PRIx64 ": watchpoint already disabled.",
watchID, (uint64_t)addr);
// This is needed (for now) to keep watchpoints disabled correctly
wp->SetEnabled(false, notify);
return error;
}
if (wp->IsHardware()) {
bool wp_disabled = true;
std::lock_guard<std::recursive_mutex> guard(m_thread_list.GetMutex());
uint32_t thread_count = m_thread_list.GetSize(false);
for (uint32_t i = 0; i < thread_count; ++i) {
FreeBSDThread *thread = static_cast<FreeBSDThread *>(
m_thread_list.GetThreadAtIndex(i, false).get());
if (thread)
wp_disabled &= thread->DisableHardwareWatchpoint(wp);
else
wp_disabled = false;
}
if (wp_disabled) {
wp->SetHardwareIndex(LLDB_INVALID_INDEX32);
wp->SetEnabled(false, notify);
return error;
} else
error.SetErrorString("Disabling hardware watchpoint failed");
}
} else
error.SetErrorString("Watchpoint argument was NULL.");
return error;
}
Status ProcessFreeBSD::GetWatchpointSupportInfo(uint32_t &num) {
Status error;
std::lock_guard<std::recursive_mutex> guard(m_thread_list.GetMutex());
FreeBSDThread *thread = static_cast<FreeBSDThread *>(
m_thread_list.GetThreadAtIndex(0, false).get());
if (thread)
num = thread->NumSupportedHardwareWatchpoints();
else
error.SetErrorString("Process does not exist.");
return error;
}
Status ProcessFreeBSD::GetWatchpointSupportInfo(uint32_t &num, bool &after) {
Status error = GetWatchpointSupportInfo(num);
// Watchpoints trigger and halt the inferior after
// the corresponding instruction has been executed.
after = true;
return error;
}
uint32_t ProcessFreeBSD::UpdateThreadListIfNeeded() {
std::lock_guard<std::recursive_mutex> guard(m_thread_list.GetMutex());
// Do not allow recursive updates.
return m_thread_list.GetSize(false);
}
#if 0
bool
ProcessFreeBSD::UpdateThreadList(ThreadList &old_thread_list, ThreadList &new_thread_list)
{
Log *log (ProcessPOSIXLog::GetLogIfAllCategoriesSet (POSIX_LOG_THREAD));
if (log && log->GetMask().Test(POSIX_LOG_VERBOSE))
log->Printf ("ProcessFreeBSD::%s() (pid = %" PRIi64 ")", __FUNCTION__, GetID());
bool has_updated = false;
// Update the process thread list with this new thread.
// FIXME: We should be using tid, not pid.
assert(m_monitor);
ThreadSP thread_sp (old_thread_list.FindThreadByID (GetID(), false));
if (!thread_sp) {
thread_sp.reset(CreateNewFreeBSDThread(*this, GetID()));
has_updated = true;
}
if (log && log->GetMask().Test(POSIX_LOG_VERBOSE))
log->Printf ("ProcessFreeBSD::%s() updated pid = %" PRIi64, __FUNCTION__, GetID());
new_thread_list.AddThread(thread_sp);
return has_updated; // the list has been updated
}
#endif
ByteOrder ProcessFreeBSD::GetByteOrder() const {
// FIXME: We should be able to extract this value directly. See comment in
// ProcessFreeBSD().
return m_byte_order;
}
size_t ProcessFreeBSD::PutSTDIN(const char *buf, size_t len, Status &error) {
ssize_t status;
if ((status = write(m_monitor->GetTerminalFD(), buf, len)) < 0) {
error.SetErrorToErrno();
return 0;
}
return status;
}
//------------------------------------------------------------------------------
// Utility functions.
bool ProcessFreeBSD::HasExited() {
switch (GetPrivateState()) {
default:
break;
case eStateDetached:
case eStateExited:
return true;
}
return false;
}
bool ProcessFreeBSD::IsStopped() {
switch (GetPrivateState()) {
default:
break;
case eStateStopped:
case eStateCrashed:
case eStateSuspended:
return true;
}
return false;
}
bool ProcessFreeBSD::IsAThreadRunning() {
bool is_running = false;
std::lock_guard<std::recursive_mutex> guard(m_thread_list.GetMutex());
uint32_t thread_count = m_thread_list.GetSize(false);
for (uint32_t i = 0; i < thread_count; ++i) {
FreeBSDThread *thread = static_cast<FreeBSDThread *>(
m_thread_list.GetThreadAtIndex(i, false).get());
StateType thread_state = thread->GetState();
if (thread_state == eStateRunning || thread_state == eStateStepping) {
is_running = true;
break;
}
}
return is_running;
}
const DataBufferSP ProcessFreeBSD::GetAuxvData() {
// If we're the local platform, we can ask the host for auxv data.
PlatformSP platform_sp = GetTarget().GetPlatform();
assert(platform_sp && platform_sp->IsHost());
int mib[4] = {CTL_KERN, KERN_PROC, KERN_PROC_AUXV, (int)m_process->GetID()};
size_t auxv_size = AT_COUNT * sizeof(Elf_Auxinfo);
DataBufferSP buf_sp(new DataBufferHeap(auxv_size, 0));
if (::sysctl(mib, 4, buf_sp->GetBytes(), &auxv_size, NULL, 0) != 0) {
perror("sysctl failed on auxv");
buf_sp.reset();
}
return buf_sp;
}
struct EmulatorBaton {
ProcessFreeBSD *m_process;
RegisterContext *m_reg_context;
// eRegisterKindDWARF -> RegisterValue
std::unordered_map<uint32_t, RegisterValue> m_register_values;
EmulatorBaton(ProcessFreeBSD *process, RegisterContext *reg_context)
: m_process(process), m_reg_context(reg_context) {}
};
static size_t ReadMemoryCallback(EmulateInstruction *instruction, void *baton,
const EmulateInstruction::Context &context,
lldb::addr_t addr, void *dst, size_t length) {
EmulatorBaton *emulator_baton = static_cast<EmulatorBaton *>(baton);
Status error;
size_t bytes_read =
emulator_baton->m_process->DoReadMemory(addr, dst, length, error);
if (!error.Success())
bytes_read = 0;
return bytes_read;
}
static bool ReadRegisterCallback(EmulateInstruction *instruction, void *baton,
const RegisterInfo *reg_info,
RegisterValue &reg_value) {
EmulatorBaton *emulator_baton = static_cast<EmulatorBaton *>(baton);
auto it = emulator_baton->m_register_values.find(
reg_info->kinds[eRegisterKindDWARF]);
if (it != emulator_baton->m_register_values.end()) {
reg_value = it->second;
return true;
}
// The emulator only fills in the dwarf register numbers (and in some cases
// the generic register numbers). Get the full register info from the
// register context based on the dwarf register numbers.
const RegisterInfo *full_reg_info =
emulator_baton->m_reg_context->GetRegisterInfo(
eRegisterKindDWARF, reg_info->kinds[eRegisterKindDWARF]);
bool error =
emulator_baton->m_reg_context->ReadRegister(full_reg_info, reg_value);
return error;
}
static bool WriteRegisterCallback(EmulateInstruction *instruction, void *baton,
const EmulateInstruction::Context &context,
const RegisterInfo *reg_info,
const RegisterValue &reg_value) {
EmulatorBaton *emulator_baton = static_cast<EmulatorBaton *>(baton);
emulator_baton->m_register_values[reg_info->kinds[eRegisterKindDWARF]] =
reg_value;
return true;
}
static size_t WriteMemoryCallback(EmulateInstruction *instruction, void *baton,
const EmulateInstruction::Context &context,
lldb::addr_t addr, const void *dst,
size_t length) {
return length;
}
bool ProcessFreeBSD::SingleStepBreakpointHit(
void *baton, lldb_private::StoppointCallbackContext *context,
lldb::user_id_t break_id, lldb::user_id_t break_loc_id) {
return false;
}
Status ProcessFreeBSD::SetSoftwareSingleStepBreakpoint(lldb::tid_t tid,
lldb::addr_t addr) {
Status error;
Log *log(ProcessPOSIXLog::GetLogIfAllCategoriesSet(POSIX_LOG_PROCESS));
if (log) {
log->Printf("ProcessFreeBSD::%s addr = 0x%" PRIx64, __FUNCTION__, addr);
log->Printf("SoftwareBreakpoint::%s addr = 0x%" PRIx64, __FUNCTION__, addr);
}
// Validate the address.
if (addr == LLDB_INVALID_ADDRESS)
return Status("ProcessFreeBSD::%s invalid load address specified.",
__FUNCTION__);
Breakpoint *const sw_step_break =
m_process->GetTarget().CreateBreakpoint(addr, true, false).get();
sw_step_break->SetCallback(SingleStepBreakpointHit, this, true);
sw_step_break->SetBreakpointKind("software-signle-step");
if (log)
log->Printf("ProcessFreeBSD::%s addr = 0x%" PRIx64 " -- SUCCESS",
__FUNCTION__, addr);
m_threads_stepping_with_breakpoint.insert({tid, sw_step_break->GetID()});
return Status();
}
bool ProcessFreeBSD::IsSoftwareStepBreakpoint(lldb::tid_t tid) {
ThreadSP thread = GetThreadList().FindThreadByID(tid);
if (!thread)
return false;
assert(thread->GetRegisterContext());
lldb::addr_t stop_pc = thread->GetRegisterContext()->GetPC();
const auto &iter = m_threads_stepping_with_breakpoint.find(tid);
if (iter == m_threads_stepping_with_breakpoint.end())
return false;
lldb::break_id_t bp_id = iter->second;
BreakpointSP bp = GetTarget().GetBreakpointByID(bp_id);
if (!bp)
return false;
BreakpointLocationSP bp_loc = bp->FindLocationByAddress(stop_pc);
if (!bp_loc)
return false;
GetTarget().RemoveBreakpointByID(bp_id);
m_threads_stepping_with_breakpoint.erase(tid);
return true;
}
bool ProcessFreeBSD::SupportHardwareSingleStepping() const {
lldb_private::ArchSpec arch = GetTarget().GetArchitecture();
if (arch.GetMachine() == llvm::Triple::arm ||
arch.GetMachine() == llvm::Triple::mips64 ||
arch.GetMachine() == llvm::Triple::mips64el ||
arch.GetMachine() == llvm::Triple::mips ||
arch.GetMachine() == llvm::Triple::mipsel)
return false;
return true;
}
Status ProcessFreeBSD::SetupSoftwareSingleStepping(lldb::tid_t tid) {
std::unique_ptr<EmulateInstruction> emulator_ap(
EmulateInstruction::FindPlugin(GetTarget().GetArchitecture(),
eInstructionTypePCModifying, nullptr));
if (emulator_ap == nullptr)
return Status("Instruction emulator not found!");
FreeBSDThread *thread = static_cast<FreeBSDThread *>(
m_thread_list.FindThreadByID(tid, false).get());
if (thread == NULL)
return Status("Thread not found not found!");
lldb::RegisterContextSP register_context_sp = thread->GetRegisterContext();
EmulatorBaton baton(this, register_context_sp.get());
emulator_ap->SetBaton(&baton);
emulator_ap->SetReadMemCallback(&ReadMemoryCallback);
emulator_ap->SetReadRegCallback(&ReadRegisterCallback);
emulator_ap->SetWriteMemCallback(&WriteMemoryCallback);
emulator_ap->SetWriteRegCallback(&WriteRegisterCallback);
if (!emulator_ap->ReadInstruction())
return Status("Read instruction failed!");
bool emulation_result =
emulator_ap->EvaluateInstruction(eEmulateInstructionOptionAutoAdvancePC);
const RegisterInfo *reg_info_pc = register_context_sp->GetRegisterInfo(
eRegisterKindGeneric, LLDB_REGNUM_GENERIC_PC);
auto pc_it =
baton.m_register_values.find(reg_info_pc->kinds[eRegisterKindDWARF]);
lldb::addr_t next_pc;
if (emulation_result) {
assert(pc_it != baton.m_register_values.end() &&
"Emulation was successful but PC wasn't updated");
next_pc = pc_it->second.GetAsUInt64();
} else if (pc_it == baton.m_register_values.end()) {
// Emulate instruction failed and it haven't changed PC. Advance PC
// with the size of the current opcode because the emulation of all
// PC modifying instruction should be successful. The failure most
// likely caused by a not supported instruction which don't modify PC.
next_pc =
register_context_sp->GetPC() + emulator_ap->GetOpcode().GetByteSize();
} else {
// The instruction emulation failed after it modified the PC. It is an
// unknown error where we can't continue because the next instruction is
// modifying the PC but we don't know how.
return Status("Instruction emulation failed unexpectedly");
}
SetSoftwareSingleStepBreakpoint(tid, next_pc);
return Status();
}
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