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linux-packaging-mono/external/llvm-project/lldb/source/Plugins/Process/NetBSD/NativeProcessNetBSD.cpp
Xamarin Public Jenkins (auto-signing) 468663ddbb Imported Upstream version 6.10.0.49 
Former-commit-id: 1d6753294b2993e1fbf92de9366bb9544db4189b
2020-01-16 16:38:04 +00:00

915 lines
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//===-- NativeProcessNetBSD.cpp ------------------------------- -*- C++ -*-===//
//
// The LLVM Compiler Infrastructure
//
// This file is distributed under the University of Illinois Open Source
// License. See LICENSE.TXT for details.
//
//===----------------------------------------------------------------------===//
#include "NativeProcessNetBSD.h"
// C Includes
// C++ Includes
// Other libraries and framework includes
#include "Plugins/Process/POSIX/ProcessPOSIXLog.h"
#include "lldb/Core/State.h"
#include "lldb/Host/HostProcess.h"
#include "lldb/Host/common/NativeBreakpoint.h"
#include "lldb/Host/common/NativeRegisterContext.h"
#include "lldb/Host/posix/ProcessLauncherPosixFork.h"
#include "lldb/Target/Process.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");
ArchSpec arch;
if ((status = ResolveProcessArchitecture(pid, arch)).Fail())
return status.ToError();
// Set the architecture to the exe architecture.
LLDB_LOG(log, "pid = {0:x}, detected architecture {1}", pid,
arch.GetArchitectureName());
std::unique_ptr<NativeProcessNetBSD> process_up(new NativeProcessNetBSD(
pid, launch_info.GetPTY().ReleaseMasterFileDescriptor(), native_delegate,
arch, mainloop));
status = process_up->ReinitializeThreads();
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.
ArchSpec arch;
Status status = ResolveProcessArchitecture(pid, arch);
if (!status.Success())
return status.ToError();
std::unique_ptr<NativeProcessNetBSD> process_up(
new NativeProcessNetBSD(pid, -1, native_delegate, arch, mainloop));
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)
: NativeProcessProtocol(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);
}
}
}
}
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()) {
return;
}
switch (info.psi_siginfo.si_code) {
case TRAP_BRKPT:
for (const auto &thread : m_threads) {
static_cast<NativeThreadNetBSD &>(*thread).SetStoppedByBreakpoint();
FixupBreakpointPCAsNeeded(static_cast<NativeThreadNetBSD &>(*thread));
}
SetState(StateType::eStateStopped, true);
break;
case TRAP_TRACE:
for (const auto &thread : m_threads)
static_cast<NativeThreadNetBSD &>(*thread).SetStoppedByTrace();
SetState(StateType::eStateStopped, true);
break;
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);
} break;
case TRAP_DBREG: {
// If a watchpoint was hit, report it
uint32_t wp_index;
Status error = static_cast<NativeThreadNetBSD &>(*m_threads[info.psi_lwpid])
.GetRegisterContext()
.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}",
GetID(), info.psi_lwpid, error);
if (wp_index != LLDB_INVALID_INDEX32) {
for (const auto &thread : m_threads)
static_cast<NativeThreadNetBSD &>(*thread).SetStoppedByWatchpoint(
wp_index);
SetState(StateType::eStateStopped, true);
break;
}
// If a breakpoint was hit, report it
uint32_t bp_index;
error = static_cast<NativeThreadNetBSD &>(*m_threads[info.psi_lwpid])
.GetRegisterContext()
.GetHardwareBreakHitIndex(bp_index,
(uintptr_t)info.psi_siginfo.si_addr);
if (error.Fail())
LLDB_LOG(log,
"received error while checking for hardware "
"breakpoint hits, pid = {0}, LWP = {1}, error = {2}",
GetID(), info.psi_lwpid, error);
if (bp_index != LLDB_INVALID_INDEX32) {
for (const auto &thread : m_threads)
static_cast<NativeThreadNetBSD &>(*thread).SetStoppedByBreakpoint();
SetState(StateType::eStateStopped, true);
break;
}
} break;
}
}
void NativeProcessNetBSD::MonitorSignal(lldb::pid_t pid, int signal) {
ptrace_siginfo_t info;
const auto siginfo_err =
PtraceWrapper(PT_GET_SIGINFO, pid, &info, sizeof(info));
for (const auto &thread : m_threads) {
static_cast<NativeThreadNetBSD &>(*thread).SetStoppedBySignal(
info.psi_siginfo.si_signo, &info.psi_siginfo);
}
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;
}
Status NativeProcessNetBSD::GetSoftwareBreakpointPCOffset(
uint32_t &actual_opcode_size) {
// FIXME put this behind a breakpoint protocol class that can be
// set per architecture. Need ARM, MIPS support here.
static const uint8_t g_i386_opcode[] = {0xCC};
switch (m_arch.GetMachine()) {
case llvm::Triple::x86_64:
actual_opcode_size = static_cast<uint32_t>(sizeof(g_i386_opcode));
return Status();
default:
assert(false && "CPU type not supported!");
return Status("CPU type not supported");
}
}
Status
NativeProcessNetBSD::FixupBreakpointPCAsNeeded(NativeThreadNetBSD &thread) {
Log *log(ProcessPOSIXLog::GetLogIfAllCategoriesSet(POSIX_LOG_BREAKPOINTS));
Status error;
// Find out the size of a breakpoint (might depend on where we are in the
// code).
NativeRegisterContext& context = thread.GetRegisterContext();
uint32_t breakpoint_size = 0;
error = GetSoftwareBreakpointPCOffset(breakpoint_size);
if (error.Fail()) {
LLDB_LOG(log, "GetBreakpointSize() failed: {0}", error);
return error;
} else
LLDB_LOG(log, "breakpoint size: {0}", breakpoint_size);
// First try probing for a breakpoint at a software breakpoint location: PC
// - breakpoint size.
const lldb::addr_t initial_pc_addr =
context.GetPCfromBreakpointLocation();
lldb::addr_t breakpoint_addr = initial_pc_addr;
if (breakpoint_size > 0) {
// Do not allow breakpoint probe to wrap around.
if (breakpoint_addr >= breakpoint_size)
breakpoint_addr -= breakpoint_size;
}
// Check if we stopped because of a breakpoint.
NativeBreakpointSP breakpoint_sp;
error = m_breakpoint_list.GetBreakpoint(breakpoint_addr, breakpoint_sp);
if (!error.Success() || !breakpoint_sp) {
// We didn't find one at a software probe location. Nothing to do.
LLDB_LOG(log,
"pid {0} no lldb breakpoint found at current pc with "
"adjustment: {1}",
GetID(), breakpoint_addr);
return Status();
}
// If the breakpoint is not a software breakpoint, nothing to do.
if (!breakpoint_sp->IsSoftwareBreakpoint()) {
LLDB_LOG(
log,
"pid {0} breakpoint found at {1:x}, not software, nothing to adjust",
GetID(), breakpoint_addr);
return Status();
}
//
// We have a software breakpoint and need to adjust the PC.
//
// Sanity check.
if (breakpoint_size == 0) {
// Nothing to do! How did we get here?
LLDB_LOG(log,
"pid {0} breakpoint found at {1:x}, it is software, but the "
"size is zero, nothing to do (unexpected)",
GetID(), breakpoint_addr);
return Status();
}
//
// We have a software breakpoint and need to adjust the PC.
//
// Sanity check.
if (breakpoint_size == 0) {
// Nothing to do! How did we get here?
LLDB_LOG(log,
"pid {0} breakpoint found at {1:x}, it is software, but the "
"size is zero, nothing to do (unexpected)",
GetID(), breakpoint_addr);
return Status();
}
// Change the program counter.
LLDB_LOG(log, "pid {0} tid {1}: changing PC from {2:x} to {3:x}", GetID(),
thread.GetID(), initial_pc_addr, breakpoint_addr);
error = context.SetPC(breakpoint_addr);
if (error.Fail()) {
LLDB_LOG(log, "pid {0} tid {1}: failed to set PC: {2}", GetID(),
thread.GetID(), error);
return error;
}
return error;
}
Status NativeProcessNetBSD::Resume(const ResumeActionList &resume_actions) {
Log *log(ProcessPOSIXLog::GetLogIfAllCategoriesSet(POSIX_LOG_PROCESS));
LLDB_LOG(log, "pid {0}", GetID());
const auto &thread = m_threads[0];
const ResumeAction *const action =
resume_actions.GetActionForThread(thread->GetID(), true);
if (action == nullptr) {
LLDB_LOG(log, "no action specified for pid {0} tid {1}", GetID(),
thread->GetID());
return Status();
}
Status error;
switch (action->state) {
case eStateRunning: {
// Run the thread, possibly feeding it the signal.
error = NativeProcessNetBSD::PtraceWrapper(PT_CONTINUE, GetID(), (void *)1,
action->signal);
if (!error.Success())
return error;
for (const auto &thread : m_threads)
static_cast<NativeThreadNetBSD &>(*thread).SetRunning();
SetState(eStateRunning, true);
break;
}
case eStateStepping:
// Run the thread, possibly feeding it the signal.
error = NativeProcessNetBSD::PtraceWrapper(PT_STEP, GetID(), (void *)1,
action->signal);
if (!error.Success())
return error;
for (const auto &thread : m_threads)
static_cast<NativeThreadNetBSD &>(*thread).SetStepping();
SetState(eStateStepping, true);
break;
case eStateSuspended:
case eStateStopped:
llvm_unreachable("Unexpected state");
default:
return Status("NativeProcessNetBSD::%s (): unexpected state %s specified "
"for pid %" PRIu64 ", tid %" PRIu64,
__FUNCTION__, StateAsCString(action->state), GetID(),
thread->GetID());
}
return Status();
}
Status NativeProcessNetBSD::Halt() {
Status error;
if (kill(GetID(), SIGSTOP) != 0)
error.SetErrorToErrno();
return error;
}
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::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(), true));
}
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();
}
Status NativeProcessNetBSD::AllocateMemory(size_t size, uint32_t permissions,
lldb::addr_t &addr) {
return Status("Unimplemented");
}
Status NativeProcessNetBSD::DeallocateMemory(lldb::addr_t addr) {
return Status("Unimplemented");
}
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::GetSoftwareBreakpointTrapOpcode(
size_t trap_opcode_size_hint, size_t &actual_opcode_size,
const uint8_t *&trap_opcode_bytes) {
static const uint8_t g_i386_opcode[] = {0xCC};
switch (m_arch.GetMachine()) {
case llvm::Triple::x86:
case llvm::Triple::x86_64:
trap_opcode_bytes = g_i386_opcode;
actual_opcode_size = sizeof(g_i386_opcode);
return Status();
default:
assert(false && "CPU type not supported!");
return Status("CPU type not supported");
}
}
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(!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(llvm::make_unique<NativeThreadNetBSD>(*this, thread_id));
return static_cast<NativeThreadNetBSD &>(*m_threads.back());
}
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 = waitpid(m_pid, NULL, WALLSIG)) < 0)
return Status(errno, eErrorTypePOSIX);
/* Initialize threads */
status = ReinitializeThreads();
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.
SetState(StateType::eStateStopped);
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())
return error;
bytes_read = io.piod_len;
io.piod_len = size - bytes_read;
} while (bytes_read < size);
return Status();
}
Status NativeProcessNetBSD::ReadMemoryWithoutTrap(lldb::addr_t addr, void *buf,
size_t size,
size_t &bytes_read) {
Status error = ReadMemory(addr, buf, size, bytes_read);
if (error.Fail())
return error;
return m_breakpoint_list.RemoveTrapsFromBuffer(addr, buf, size);
}
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())
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<MemoryBuffer>> buf =
llvm::MemoryBuffer::getNewMemBuffer(auxv_size);
struct ptrace_io_desc io;
io.piod_op = PIOD_READ_AUXV;
io.piod_offs = 0;
io.piod_addr = const_cast<void *>(static_cast<const 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 buf;
}
Status NativeProcessNetBSD::ReinitializeThreads() {
// Clear old threads
m_threads.clear();
// Initialize new thread
struct ptrace_lwpinfo info = {};
Status error = PtraceWrapper(PT_LWPINFO, 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(PT_LWPINFO, GetID(), &info, sizeof(info));
if (error.Fail()) {
return error;
}
}
return error;
}
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