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v811_spc009/external/llvm-project/lldb/source/Plugins/Process/NetBSD/NativeProcessNetBSD.cpp

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//===-- NativeProcessNetBSD.cpp -------------------------------------------===//
//
// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
// See https://llvm.org/LICENSE.txt for license information.
// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
//
//===----------------------------------------------------------------------===//
#include "NativeProcessNetBSD.h"
#include "Plugins/Process/NetBSD/NativeRegisterContextNetBSD.h"
#include "Plugins/Process/POSIX/ProcessPOSIXLog.h"
#include "lldb/Host/HostProcess.h"
#include "lldb/Host/common/NativeRegisterContext.h"
#include "lldb/Host/posix/ProcessLauncherPosixFork.h"
#include "lldb/Target/Process.h"
#include "lldb/Utility/State.h"
#include "llvm/Support/Errno.h"
// System includes - They have to be included after framework includes because
// they define some macros which collide with variable names in other modules
// clang-format off
#include <sys/types.h>
#include <sys/ptrace.h>
#include <sys/sysctl.h>
#include <sys/wait.h>
#include <uvm/uvm_prot.h>
#include <elf.h>
#include <util.h>
// clang-format on
using namespace lldb;
using namespace lldb_private;
using namespace lldb_private::process_netbsd;
using namespace llvm;
// Simple helper function to ensure flags are enabled on the given file
// descriptor.
static Status EnsureFDFlags(int fd, int flags) {
Status error;
int status = fcntl(fd, F_GETFL);
if (status == -1) {
error.SetErrorToErrno();
return error;
}
if (fcntl(fd, F_SETFL, status | flags) == -1) {
error.SetErrorToErrno();
return error;
}
return error;
}
// Public Static Methods
llvm::Expected<std::unique_ptr<NativeProcessProtocol>>
NativeProcessNetBSD::Factory::Launch(ProcessLaunchInfo &launch_info,
NativeDelegate &native_delegate,
MainLoop &mainloop) const {
Log *log(ProcessPOSIXLog::GetLogIfAllCategoriesSet(POSIX_LOG_PROCESS));
Status status;
::pid_t pid = ProcessLauncherPosixFork()
.LaunchProcess(launch_info, status)
.GetProcessId();
LLDB_LOG(log, "pid = {0:x}", pid);
if (status.Fail()) {
LLDB_LOG(log, "failed to launch process: {0}", status);
return status.ToError();
}
// Wait for the child process to trap on its call to execve.
int wstatus;
::pid_t wpid = llvm::sys::RetryAfterSignal(-1, ::waitpid, pid, &wstatus, 0);
assert(wpid == pid);
(void)wpid;
if (!WIFSTOPPED(wstatus)) {
LLDB_LOG(log, "Could not sync with inferior process: wstatus={1}",
WaitStatus::Decode(wstatus));
return llvm::make_error<StringError>("Could not sync with inferior process",
llvm::inconvertibleErrorCode());
}
LLDB_LOG(log, "inferior started, now in stopped state");
ProcessInstanceInfo Info;
if (!Host::GetProcessInfo(pid, Info)) {
return llvm::make_error<StringError>("Cannot get process architecture",
llvm::inconvertibleErrorCode());
}
// Set the architecture to the exe architecture.
LLDB_LOG(log, "pid = {0:x}, detected architecture {1}", pid,
Info.GetArchitecture().GetArchitectureName());
std::unique_ptr<NativeProcessNetBSD> process_up(new NativeProcessNetBSD(
pid, launch_info.GetPTY().ReleasePrimaryFileDescriptor(), native_delegate,
Info.GetArchitecture(), mainloop));
status = process_up->SetupTrace();
if (status.Fail())
return status.ToError();
for (const auto &thread : process_up->m_threads)
static_cast<NativeThreadNetBSD &>(*thread).SetStoppedBySignal(SIGSTOP);
process_up->SetState(StateType::eStateStopped, false);
return std::move(process_up);
}
llvm::Expected<std::unique_ptr<NativeProcessProtocol>>
NativeProcessNetBSD::Factory::Attach(
lldb::pid_t pid, NativeProcessProtocol::NativeDelegate &native_delegate,
MainLoop &mainloop) const {
Log *log(ProcessPOSIXLog::GetLogIfAllCategoriesSet(POSIX_LOG_PROCESS));
LLDB_LOG(log, "pid = {0:x}", pid);
// Retrieve the architecture for the running process.
ProcessInstanceInfo Info;
if (!Host::GetProcessInfo(pid, Info)) {
return llvm::make_error<StringError>("Cannot get process architecture",
llvm::inconvertibleErrorCode());
}
std::unique_ptr<NativeProcessNetBSD> process_up(new NativeProcessNetBSD(
pid, -1, native_delegate, Info.GetArchitecture(), mainloop));
Status status = process_up->Attach();
if (!status.Success())
return status.ToError();
return std::move(process_up);
}
// Public Instance Methods
NativeProcessNetBSD::NativeProcessNetBSD(::pid_t pid, int terminal_fd,
NativeDelegate &delegate,
const ArchSpec &arch,
MainLoop &mainloop)
: NativeProcessELF(pid, terminal_fd, delegate), m_arch(arch) {
if (m_terminal_fd != -1) {
Status status = EnsureFDFlags(m_terminal_fd, O_NONBLOCK);
assert(status.Success());
}
Status status;
m_sigchld_handle = mainloop.RegisterSignal(
SIGCHLD, [this](MainLoopBase &) { SigchldHandler(); }, status);
assert(m_sigchld_handle && status.Success());
}
// Handles all waitpid events from the inferior process.
void NativeProcessNetBSD::MonitorCallback(lldb::pid_t pid, int signal) {
switch (signal) {
case SIGTRAP:
return MonitorSIGTRAP(pid);
case SIGSTOP:
return MonitorSIGSTOP(pid);
default:
return MonitorSignal(pid, signal);
}
}
void NativeProcessNetBSD::MonitorExited(lldb::pid_t pid, WaitStatus status) {
Log *log(ProcessPOSIXLog::GetLogIfAllCategoriesSet(POSIX_LOG_PROCESS));
LLDB_LOG(log, "got exit signal({0}) , pid = {1}", status, pid);
/* Stop Tracking All Threads attached to Process */
m_threads.clear();
SetExitStatus(status, true);
// Notify delegate that our process has exited.
SetState(StateType::eStateExited, true);
}
void NativeProcessNetBSD::MonitorSIGSTOP(lldb::pid_t pid) {
ptrace_siginfo_t info;
const auto siginfo_err =
PtraceWrapper(PT_GET_SIGINFO, pid, &info, sizeof(info));
// Get details on the signal raised.
if (siginfo_err.Success()) {
// Handle SIGSTOP from LLGS (LLDB GDB Server)
if (info.psi_siginfo.si_code == SI_USER &&
info.psi_siginfo.si_pid == ::getpid()) {
/* Stop Tracking all Threads attached to Process */
for (const auto &thread : m_threads) {
static_cast<NativeThreadNetBSD &>(*thread).SetStoppedBySignal(
SIGSTOP, &info.psi_siginfo);
}
}
SetState(StateType::eStateStopped, true);
}
}
void NativeProcessNetBSD::MonitorSIGTRAP(lldb::pid_t pid) {
Log *log(ProcessPOSIXLog::GetLogIfAllCategoriesSet(POSIX_LOG_PROCESS));
ptrace_siginfo_t info;
const auto siginfo_err =
PtraceWrapper(PT_GET_SIGINFO, pid, &info, sizeof(info));
// Get details on the signal raised.
if (siginfo_err.Fail()) {
LLDB_LOG(log, "PT_GET_SIGINFO failed {0}", siginfo_err);
return;
}
LLDB_LOG(log, "got SIGTRAP, pid = {0}, lwpid = {1}, si_code = {2}", pid,
info.psi_lwpid, info.psi_siginfo.si_code);
NativeThreadNetBSD* thread = nullptr;
if (info.psi_lwpid > 0) {
for (const auto &t : m_threads) {
if (t->GetID() == static_cast<lldb::tid_t>(info.psi_lwpid)) {
thread = static_cast<NativeThreadNetBSD *>(t.get());
break;
}
static_cast<NativeThreadNetBSD *>(t.get())->SetStoppedWithNoReason();
}
if (!thread)
LLDB_LOG(log,
"thread not found in m_threads, pid = {0}, LWP = {1}", pid,
info.psi_lwpid);
}
switch (info.psi_siginfo.si_code) {
case TRAP_BRKPT:
if (thread) {
thread->SetStoppedByBreakpoint();
FixupBreakpointPCAsNeeded(*thread);
}
SetState(StateType::eStateStopped, true);
return;
case TRAP_TRACE:
if (thread)
thread->SetStoppedByTrace();
SetState(StateType::eStateStopped, true);
return;
case TRAP_EXEC: {
Status error = ReinitializeThreads();
if (error.Fail()) {
SetState(StateType::eStateInvalid);
return;
}
// Let our delegate know we have just exec'd.
NotifyDidExec();
for (const auto &thread : m_threads)
static_cast<NativeThreadNetBSD &>(*thread).SetStoppedByExec();
SetState(StateType::eStateStopped, true);
return;
}
case TRAP_LWP: {
ptrace_state_t pst;
Status error = PtraceWrapper(PT_GET_PROCESS_STATE, pid, &pst, sizeof(pst));
if (error.Fail()) {
SetState(StateType::eStateInvalid);
return;
}
switch (pst.pe_report_event) {
case PTRACE_LWP_CREATE: {
LLDB_LOG(log,
"monitoring new thread, pid = {0}, LWP = {1}", pid,
pst.pe_lwp);
NativeThreadNetBSD& t = AddThread(pst.pe_lwp);
error = t.CopyWatchpointsFrom(
static_cast<NativeThreadNetBSD &>(*GetCurrentThread()));
if (error.Fail()) {
LLDB_LOG(log,
"failed to copy watchpoints to new thread {0}: {1}",
pst.pe_lwp, error);
SetState(StateType::eStateInvalid);
return;
}
} break;
case PTRACE_LWP_EXIT:
LLDB_LOG(log,
"removing exited thread, pid = {0}, LWP = {1}", pid,
pst.pe_lwp);
RemoveThread(pst.pe_lwp);
break;
}
error = PtraceWrapper(PT_CONTINUE, pid, reinterpret_cast<void*>(1), 0);
if (error.Fail())
SetState(StateType::eStateInvalid);
return;
}
case TRAP_DBREG: {
if (!thread)
break;
auto &regctx = static_cast<NativeRegisterContextNetBSD &>(
thread->GetRegisterContext());
uint32_t wp_index = LLDB_INVALID_INDEX32;
Status error = regctx.GetWatchpointHitIndex(wp_index,
(uintptr_t)info.psi_siginfo.si_addr);
if (error.Fail())
LLDB_LOG(log,
"received error while checking for watchpoint hits, pid = "
"{0}, LWP = {1}, error = {2}", pid, info.psi_lwpid, error);
if (wp_index != LLDB_INVALID_INDEX32) {
thread->SetStoppedByWatchpoint(wp_index);
regctx.ClearWatchpointHit(wp_index);
SetState(StateType::eStateStopped, true);
return;
}
thread->SetStoppedByTrace();
SetState(StateType::eStateStopped, true);
return;
}
}
// Either user-generated SIGTRAP or an unknown event that would
// otherwise leave the debugger hanging.
LLDB_LOG(log, "unknown SIGTRAP, passing to generic handler");
MonitorSignal(pid, SIGTRAP);
}
void NativeProcessNetBSD::MonitorSignal(lldb::pid_t pid, int signal) {
Log *log(ProcessPOSIXLog::GetLogIfAllCategoriesSet(POSIX_LOG_PROCESS));
ptrace_siginfo_t info;
const auto siginfo_err =
PtraceWrapper(PT_GET_SIGINFO, pid, &info, sizeof(info));
if (siginfo_err.Fail()) {
LLDB_LOG(log, "PT_LWPINFO failed {0}", siginfo_err);
return;
}
for (const auto &abs_thread : m_threads) {
NativeThreadNetBSD &thread = static_cast<NativeThreadNetBSD &>(*abs_thread);
assert(info.psi_lwpid >= 0);
if (info.psi_lwpid == 0 ||
static_cast<lldb::tid_t>(info.psi_lwpid) == thread.GetID())
thread.SetStoppedBySignal(info.psi_siginfo.si_signo, &info.psi_siginfo);
else
thread.SetStoppedWithNoReason();
}
SetState(StateType::eStateStopped, true);
}
Status NativeProcessNetBSD::PtraceWrapper(int req, lldb::pid_t pid, void *addr,
int data, int *result) {
Log *log(ProcessPOSIXLog::GetLogIfAllCategoriesSet(POSIX_LOG_PTRACE));
Status error;
int ret;
errno = 0;
ret = ptrace(req, static_cast<::pid_t>(pid), addr, data);
if (ret == -1)
error.SetErrorToErrno();
if (result)
*result = ret;
LLDB_LOG(log, "ptrace({0}, {1}, {2}, {3})={4:x}", req, pid, addr, data, ret);
if (error.Fail())
LLDB_LOG(log, "ptrace() failed: {0}", error);
return error;
}
static llvm::Expected<ptrace_siginfo_t> ComputeSignalInfo(
const std::vector<std::unique_ptr<NativeThreadProtocol>> &threads,
const ResumeActionList &resume_actions) {
// We need to account for three possible scenarios:
// 1. no signal being sent.
// 2. a signal being sent to one thread.
// 3. a signal being sent to the whole process.
// Count signaled threads. While at it, determine which signal is being sent
// and ensure there's only one.
size_t signaled_threads = 0;
int signal = LLDB_INVALID_SIGNAL_NUMBER;
lldb::tid_t signaled_lwp;
for (const auto &thread : threads) {
assert(thread && "thread list should not contain NULL threads");
const ResumeAction *action =
resume_actions.GetActionForThread(thread->GetID(), true);
if (action) {
if (action->signal != LLDB_INVALID_SIGNAL_NUMBER) {
signaled_threads++;
if (action->signal != signal) {
if (signal != LLDB_INVALID_SIGNAL_NUMBER)
return Status("NetBSD does not support passing multiple signals "
"simultaneously")
.ToError();
signal = action->signal;
signaled_lwp = thread->GetID();
}
}
}
}
if (signaled_threads == 0) {
ptrace_siginfo_t siginfo;
siginfo.psi_siginfo.si_signo = LLDB_INVALID_SIGNAL_NUMBER;
return siginfo;
}
if (signaled_threads > 1 && signaled_threads < threads.size())
return Status("NetBSD does not support passing signal to 1<i<all threads")
.ToError();
ptrace_siginfo_t siginfo;
siginfo.psi_siginfo.si_signo = signal;
siginfo.psi_siginfo.si_code = SI_USER;
siginfo.psi_siginfo.si_pid = getpid();
siginfo.psi_siginfo.si_uid = getuid();
if (signaled_threads == 1)
siginfo.psi_lwpid = signaled_lwp;
else // signal for the whole process
siginfo.psi_lwpid = 0;
return siginfo;
}
Status NativeProcessNetBSD::Resume(const ResumeActionList &resume_actions) {
Log *log(ProcessPOSIXLog::GetLogIfAllCategoriesSet(POSIX_LOG_PROCESS));
LLDB_LOG(log, "pid {0}", GetID());
Status ret;
Expected<ptrace_siginfo_t> siginfo =
ComputeSignalInfo(m_threads, resume_actions);
if (!siginfo)
return Status(siginfo.takeError());
for (const auto &abs_thread : m_threads) {
assert(abs_thread && "thread list should not contain NULL threads");
NativeThreadNetBSD &thread = static_cast<NativeThreadNetBSD &>(*abs_thread);
const ResumeAction *action =
resume_actions.GetActionForThread(thread.GetID(), true);
// we need to explicit issue suspend requests, so it is simpler to map it
// into proper action
ResumeAction suspend_action{thread.GetID(), eStateSuspended,
LLDB_INVALID_SIGNAL_NUMBER};
if (action == nullptr) {
LLDB_LOG(log, "no action specified for pid {0} tid {1}", GetID(),
thread.GetID());
action = &suspend_action;
}
LLDB_LOG(
log,
"processing resume action state {0} signal {1} for pid {2} tid {3}",
action->state, action->signal, GetID(), thread.GetID());
switch (action->state) {
case eStateRunning:
ret = thread.Resume();
break;
case eStateStepping:
ret = thread.SingleStep();
break;
case eStateSuspended:
case eStateStopped:
if (action->signal != LLDB_INVALID_SIGNAL_NUMBER)
return Status("Passing signal to suspended thread unsupported");
ret = thread.Suspend();
break;
default:
return Status("NativeProcessNetBSD::%s (): unexpected state %s specified "
"for pid %" PRIu64 ", tid %" PRIu64,
__FUNCTION__, StateAsCString(action->state), GetID(),
thread.GetID());
}
if (!ret.Success())
return ret;
}
int signal = 0;
if (siginfo->psi_siginfo.si_signo != LLDB_INVALID_SIGNAL_NUMBER) {
ret = PtraceWrapper(PT_SET_SIGINFO, GetID(), &siginfo.get(),
sizeof(*siginfo));
if (!ret.Success())
return ret;
signal = siginfo->psi_siginfo.si_signo;
}
ret = PtraceWrapper(PT_CONTINUE, GetID(), reinterpret_cast<void *>(1),
signal);
if (ret.Success())
SetState(eStateRunning, true);
return ret;
}
Status NativeProcessNetBSD::Halt() {
return PtraceWrapper(PT_STOP, GetID());
}
Status NativeProcessNetBSD::Detach() {
Status error;
// Stop monitoring the inferior.
m_sigchld_handle.reset();
// Tell ptrace to detach from the process.
if (GetID() == LLDB_INVALID_PROCESS_ID)
return error;
return PtraceWrapper(PT_DETACH, GetID());
}
Status NativeProcessNetBSD::Signal(int signo) {
Status error;
if (kill(GetID(), signo))
error.SetErrorToErrno();
return error;
}
Status NativeProcessNetBSD::Interrupt() {
return PtraceWrapper(PT_STOP, GetID());
}
Status NativeProcessNetBSD::Kill() {
Log *log(ProcessPOSIXLog::GetLogIfAllCategoriesSet(POSIX_LOG_PROCESS));
LLDB_LOG(log, "pid {0}", GetID());
Status error;
switch (m_state) {
case StateType::eStateInvalid:
case StateType::eStateExited:
case StateType::eStateCrashed:
case StateType::eStateDetached:
case StateType::eStateUnloaded:
// Nothing to do - the process is already dead.
LLDB_LOG(log, "ignored for PID {0} due to current state: {1}", GetID(),
StateAsCString(m_state));
return error;
case StateType::eStateConnected:
case StateType::eStateAttaching:
case StateType::eStateLaunching:
case StateType::eStateStopped:
case StateType::eStateRunning:
case StateType::eStateStepping:
case StateType::eStateSuspended:
// We can try to kill a process in these states.
break;
}
if (kill(GetID(), SIGKILL) != 0) {
error.SetErrorToErrno();
return error;
}
return error;
}
Status NativeProcessNetBSD::GetMemoryRegionInfo(lldb::addr_t load_addr,
MemoryRegionInfo &range_info) {
if (m_supports_mem_region == LazyBool::eLazyBoolNo) {
// We're done.
return Status("unsupported");
}
Status error = PopulateMemoryRegionCache();
if (error.Fail()) {
return error;
}
lldb::addr_t prev_base_address = 0;
// FIXME start by finding the last region that is <= target address using
// binary search. Data is sorted.
// There can be a ton of regions on pthreads apps with lots of threads.
for (auto it = m_mem_region_cache.begin(); it != m_mem_region_cache.end();
++it) {
MemoryRegionInfo &proc_entry_info = it->first;
// Sanity check assumption that memory map entries are ascending.
assert((proc_entry_info.GetRange().GetRangeBase() >= prev_base_address) &&
"descending memory map entries detected, unexpected");
prev_base_address = proc_entry_info.GetRange().GetRangeBase();
UNUSED_IF_ASSERT_DISABLED(prev_base_address);
// If the target address comes before this entry, indicate distance to next
// region.
if (load_addr < proc_entry_info.GetRange().GetRangeBase()) {
range_info.GetRange().SetRangeBase(load_addr);
range_info.GetRange().SetByteSize(
proc_entry_info.GetRange().GetRangeBase() - load_addr);
range_info.SetReadable(MemoryRegionInfo::OptionalBool::eNo);
range_info.SetWritable(MemoryRegionInfo::OptionalBool::eNo);
range_info.SetExecutable(MemoryRegionInfo::OptionalBool::eNo);
range_info.SetMapped(MemoryRegionInfo::OptionalBool::eNo);
return error;
} else if (proc_entry_info.GetRange().Contains(load_addr)) {
// The target address is within the memory region we're processing here.
range_info = proc_entry_info;
return error;
}
// The target memory address comes somewhere after the region we just
// parsed.
}
// If we made it here, we didn't find an entry that contained the given
// address. Return the load_addr as start and the amount of bytes betwwen
// load address and the end of the memory as size.
range_info.GetRange().SetRangeBase(load_addr);
range_info.GetRange().SetRangeEnd(LLDB_INVALID_ADDRESS);
range_info.SetReadable(MemoryRegionInfo::OptionalBool::eNo);
range_info.SetWritable(MemoryRegionInfo::OptionalBool::eNo);
range_info.SetExecutable(MemoryRegionInfo::OptionalBool::eNo);
range_info.SetMapped(MemoryRegionInfo::OptionalBool::eNo);
return error;
}
Status NativeProcessNetBSD::PopulateMemoryRegionCache() {
Log *log(ProcessPOSIXLog::GetLogIfAllCategoriesSet(POSIX_LOG_PROCESS));
// If our cache is empty, pull the latest. There should always be at least
// one memory region if memory region handling is supported.
if (!m_mem_region_cache.empty()) {
LLDB_LOG(log, "reusing {0} cached memory region entries",
m_mem_region_cache.size());
return Status();
}
struct kinfo_vmentry *vm;
size_t count, i;
vm = kinfo_getvmmap(GetID(), &count);
if (vm == NULL) {
m_supports_mem_region = LazyBool::eLazyBoolNo;
Status error;
error.SetErrorString("not supported");
return error;
}
for (i = 0; i < count; i++) {
MemoryRegionInfo info;
info.Clear();
info.GetRange().SetRangeBase(vm[i].kve_start);
info.GetRange().SetRangeEnd(vm[i].kve_end);
info.SetMapped(MemoryRegionInfo::OptionalBool::eYes);
if (vm[i].kve_protection & VM_PROT_READ)
info.SetReadable(MemoryRegionInfo::OptionalBool::eYes);
else
info.SetReadable(MemoryRegionInfo::OptionalBool::eNo);
if (vm[i].kve_protection & VM_PROT_WRITE)
info.SetWritable(MemoryRegionInfo::OptionalBool::eYes);
else
info.SetWritable(MemoryRegionInfo::OptionalBool::eNo);
if (vm[i].kve_protection & VM_PROT_EXECUTE)
info.SetExecutable(MemoryRegionInfo::OptionalBool::eYes);
else
info.SetExecutable(MemoryRegionInfo::OptionalBool::eNo);
if (vm[i].kve_path[0])
info.SetName(vm[i].kve_path);
m_mem_region_cache.emplace_back(
info, FileSpec(info.GetName().GetCString()));
}
free(vm);
if (m_mem_region_cache.empty()) {
// No entries after attempting to read them. This shouldn't happen. Assume
// we don't support map entries.
LLDB_LOG(log, "failed to find any vmmap entries, assuming no support "
"for memory region metadata retrieval");
m_supports_mem_region = LazyBool::eLazyBoolNo;
Status error;
error.SetErrorString("not supported");
return error;
}
LLDB_LOG(log, "read {0} memory region entries from process {1}",
m_mem_region_cache.size(), GetID());
// We support memory retrieval, remember that.
m_supports_mem_region = LazyBool::eLazyBoolYes;
return Status();
}
lldb::addr_t NativeProcessNetBSD::GetSharedLibraryInfoAddress() {
// punt on this for now
return LLDB_INVALID_ADDRESS;
}
size_t NativeProcessNetBSD::UpdateThreads() { return m_threads.size(); }
Status NativeProcessNetBSD::SetBreakpoint(lldb::addr_t addr, uint32_t size,
bool hardware) {
if (hardware)
return Status("NativeProcessNetBSD does not support hardware breakpoints");
else
return SetSoftwareBreakpoint(addr, size);
}
Status NativeProcessNetBSD::GetLoadedModuleFileSpec(const char *module_path,
FileSpec &file_spec) {
return Status("Unimplemented");
}
Status NativeProcessNetBSD::GetFileLoadAddress(const llvm::StringRef &file_name,
lldb::addr_t &load_addr) {
load_addr = LLDB_INVALID_ADDRESS;
return Status();
}
void NativeProcessNetBSD::SigchldHandler() {
Log *log(ProcessPOSIXLog::GetLogIfAllCategoriesSet(POSIX_LOG_PROCESS));
// Process all pending waitpid notifications.
int status;
::pid_t wait_pid =
llvm::sys::RetryAfterSignal(-1, waitpid, GetID(), &status, WALLSIG | WNOHANG);
if (wait_pid == 0)
return; // We are done.
if (wait_pid == -1) {
Status error(errno, eErrorTypePOSIX);
LLDB_LOG(log, "waitpid ({0}, &status, _) failed: {1}", GetID(), error);
}
WaitStatus wait_status = WaitStatus::Decode(status);
bool exited = wait_status.type == WaitStatus::Exit ||
(wait_status.type == WaitStatus::Signal &&
wait_pid == static_cast<::pid_t>(GetID()));
LLDB_LOG(log,
"waitpid ({0}, &status, _) => pid = {1}, status = {2}, exited = {3}",
GetID(), wait_pid, status, exited);
if (exited)
MonitorExited(wait_pid, wait_status);
else {
assert(wait_status.type == WaitStatus::Stop);
MonitorCallback(wait_pid, wait_status.status);
}
}
bool NativeProcessNetBSD::HasThreadNoLock(lldb::tid_t thread_id) {
for (const auto &thread : m_threads) {
assert(thread && "thread list should not contain NULL threads");
if (thread->GetID() == thread_id) {
// We have this thread.
return true;
}
}
// We don't have this thread.
return false;
}
NativeThreadNetBSD &NativeProcessNetBSD::AddThread(lldb::tid_t thread_id) {
Log *log(ProcessPOSIXLog::GetLogIfAllCategoriesSet(POSIX_LOG_THREAD));
LLDB_LOG(log, "pid {0} adding thread with tid {1}", GetID(), thread_id);
assert(thread_id > 0);
assert(!HasThreadNoLock(thread_id) &&
"attempted to add a thread by id that already exists");
// If this is the first thread, save it as the current thread
if (m_threads.empty())
SetCurrentThreadID(thread_id);
m_threads.push_back(std::make_unique<NativeThreadNetBSD>(*this, thread_id));
return static_cast<NativeThreadNetBSD &>(*m_threads.back());
}
void NativeProcessNetBSD::RemoveThread(lldb::tid_t thread_id) {
Log *log(ProcessPOSIXLog::GetLogIfAllCategoriesSet(POSIX_LOG_THREAD));
LLDB_LOG(log, "pid {0} removing thread with tid {1}", GetID(), thread_id);
assert(thread_id > 0);
assert(HasThreadNoLock(thread_id) &&
"attempted to remove a thread that does not exist");
for (auto it = m_threads.begin(); it != m_threads.end(); ++it) {
if ((*it)->GetID() == thread_id) {
m_threads.erase(it);
break;
}
}
}
Status NativeProcessNetBSD::Attach() {
// Attach to the requested process.
// An attach will cause the thread to stop with a SIGSTOP.
Status status = PtraceWrapper(PT_ATTACH, m_pid);
if (status.Fail())
return status;
int wstatus;
// Need to use WALLSIG otherwise we receive an error with errno=ECHLD At this
// point we should have a thread stopped if waitpid succeeds.
if ((wstatus = llvm::sys::RetryAfterSignal(-1, waitpid,
m_pid, nullptr, WALLSIG)) < 0)
return Status(errno, eErrorTypePOSIX);
// Initialize threads and tracing status
// NB: this needs to be called before we set thread state
status = SetupTrace();
if (status.Fail())
return status;
for (const auto &thread : m_threads)
static_cast<NativeThreadNetBSD &>(*thread).SetStoppedBySignal(SIGSTOP);
// Let our process instance know the thread has stopped.
SetCurrentThreadID(m_threads.front()->GetID());
SetState(StateType::eStateStopped, false);
return Status();
}
Status NativeProcessNetBSD::ReadMemory(lldb::addr_t addr, void *buf,
size_t size, size_t &bytes_read) {
unsigned char *dst = static_cast<unsigned char *>(buf);
struct ptrace_io_desc io;
Log *log(ProcessPOSIXLog::GetLogIfAllCategoriesSet(POSIX_LOG_MEMORY));
LLDB_LOG(log, "addr = {0}, buf = {1}, size = {2}", addr, buf, size);
bytes_read = 0;
io.piod_op = PIOD_READ_D;
io.piod_len = size;
do {
io.piod_offs = (void *)(addr + bytes_read);
io.piod_addr = dst + bytes_read;
Status error = NativeProcessNetBSD::PtraceWrapper(PT_IO, GetID(), &io);
if (error.Fail() || io.piod_len == 0)
return error;
bytes_read += io.piod_len;
io.piod_len = size - bytes_read;
} while (bytes_read < size);
return Status();
}
Status NativeProcessNetBSD::WriteMemory(lldb::addr_t addr, const void *buf,
size_t size, size_t &bytes_written) {
const unsigned char *src = static_cast<const unsigned char *>(buf);
Status error;
struct ptrace_io_desc io;
Log *log(ProcessPOSIXLog::GetLogIfAllCategoriesSet(POSIX_LOG_MEMORY));
LLDB_LOG(log, "addr = {0}, buf = {1}, size = {2}", addr, buf, size);
bytes_written = 0;
io.piod_op = PIOD_WRITE_D;
io.piod_len = size;
do {
io.piod_addr =
const_cast<void *>(static_cast<const void *>(src + bytes_written));
io.piod_offs = (void *)(addr + bytes_written);
Status error = NativeProcessNetBSD::PtraceWrapper(PT_IO, GetID(), &io);
if (error.Fail() || io.piod_len == 0)
return error;
bytes_written += io.piod_len;
io.piod_len = size - bytes_written;
} while (bytes_written < size);
return error;
}
llvm::ErrorOr<std::unique_ptr<llvm::MemoryBuffer>>
NativeProcessNetBSD::GetAuxvData() const {
/*
* ELF_AUX_ENTRIES is currently restricted to kernel
* (<sys/exec_elf.h> r. 1.155 specifies 15)
*
* ptrace(2) returns the whole AUXV including extra fiels after AT_NULL this
* information isn't needed.
*/
size_t auxv_size = 100 * sizeof(AuxInfo);
ErrorOr<std::unique_ptr<WritableMemoryBuffer>> buf =
llvm::WritableMemoryBuffer::getNewMemBuffer(auxv_size);
struct ptrace_io_desc io;
io.piod_op = PIOD_READ_AUXV;
io.piod_offs = 0;
io.piod_addr = static_cast<void *>(buf.get()->getBufferStart());
io.piod_len = auxv_size;
Status error = NativeProcessNetBSD::PtraceWrapper(PT_IO, GetID(), &io);
if (error.Fail())
return std::error_code(error.GetError(), std::generic_category());
if (io.piod_len < 1)
return std::error_code(ECANCELED, std::generic_category());
return std::move(buf);
}
Status NativeProcessNetBSD::SetupTrace() {
// Enable event reporting
ptrace_event_t events;
Status status = PtraceWrapper(PT_GET_EVENT_MASK, GetID(), &events, sizeof(events));
if (status.Fail())
return status;
// TODO: PTRACE_FORK | PTRACE_VFORK | PTRACE_POSIX_SPAWN?
events.pe_set_event |= PTRACE_LWP_CREATE | PTRACE_LWP_EXIT;
status = PtraceWrapper(PT_SET_EVENT_MASK, GetID(), &events, sizeof(events));
if (status.Fail())
return status;
return ReinitializeThreads();
}
Status NativeProcessNetBSD::ReinitializeThreads() {
// Clear old threads
m_threads.clear();
// Initialize new thread
#ifdef PT_LWPSTATUS
struct ptrace_lwpstatus info = {};
int op = PT_LWPNEXT;
#else
struct ptrace_lwpinfo info = {};
int op = PT_LWPINFO;
#endif
Status error = PtraceWrapper(op, GetID(), &info, sizeof(info));
if (error.Fail()) {
return error;
}
// Reinitialize from scratch threads and register them in process
while (info.pl_lwpid != 0) {
AddThread(info.pl_lwpid);
error = PtraceWrapper(op, GetID(), &info, sizeof(info));
if (error.Fail()) {
return error;
}
}
return error;
}
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