Add lldb-gdbserver support for Linux x86_64.
This change brings in lldb-gdbserver (llgs) specifically for Linux x86_64.
(More architectures coming soon).
Not every debugserver option is covered yet. Currently
the lldb-gdbserver command line can start unattached,
start attached to a pid (process-name attach not supported yet),
or accept lldb attaching and launching a process or connecting
by process id.
The history of this large change can be found here:
https://github.com/tfiala/lldb/tree/dev-tfiala-native-protocol-linux-x86_64
Until mid/late April, I was not sharing the work and continued
to rebase it off of head (developed via id tfiala@google.com). I switched over to
user todd.fiala@gmail.com in the middle, and once I went to github, I did
merges rather than rebasing so I could share with others.
llvm-svn: 212069
diff --git a/lldb/source/Plugins/Process/Linux/NativeThreadLinux.cpp b/lldb/source/Plugins/Process/Linux/NativeThreadLinux.cpp
new file mode 100644
index 0000000..d9cd183
--- /dev/null
+++ b/lldb/source/Plugins/Process/Linux/NativeThreadLinux.cpp
@@ -0,0 +1,363 @@
+//===-- NativeThreadLinux.cpp --------------------------------- -*- C++ -*-===//
+//
+// The LLVM Compiler Infrastructure
+//
+// This file is distributed under the University of Illinois Open Source
+// License. See LICENSE.TXT for details.
+//
+//===----------------------------------------------------------------------===//
+
+#include "NativeThreadLinux.h"
+
+#include <signal.h>
+
+#include "NativeProcessLinux.h"
+#include "lldb/Core/Log.h"
+#include "lldb/Core/State.h"
+#include "lldb/Host/Host.h"
+#include "lldb/lldb-enumerations.h"
+#include "lldb/lldb-private-log.h"
+#include "Plugins/Process/Utility/NativeRegisterContextLinux_x86_64.h"
+#include "Plugins/Process/Utility/RegisterContextLinux_i386.h"
+#include "Plugins/Process/Utility/RegisterContextLinux_x86_64.h"
+#include "Plugins/Process/Utility/RegisterInfoInterface.h"
+
+using namespace lldb;
+using namespace lldb_private;
+
+namespace
+{
+ void LogThreadStopInfo (Log &log, const ThreadStopInfo &stop_info, const char *const header)
+ {
+ switch (stop_info.reason)
+ {
+ case eStopReasonSignal:
+ log.Printf ("%s: %s: signal 0x%" PRIx32, __FUNCTION__, header, stop_info.details.signal.signo);
+ return;
+ case eStopReasonException:
+ log.Printf ("%s: %s: exception type 0x%" PRIx64, __FUNCTION__, header, stop_info.details.exception.type);
+ return;
+ default:
+ log.Printf ("%s: %s: invalid stop reason %" PRIu32, __FUNCTION__, header, static_cast<uint32_t> (stop_info.reason));
+ }
+ }
+}
+
+NativeThreadLinux::NativeThreadLinux (NativeProcessLinux *process, lldb::tid_t tid) :
+ NativeThreadProtocol (process, tid),
+ m_state (StateType::eStateInvalid),
+ m_stop_info (),
+ m_reg_context_sp ()
+{
+}
+
+const char *
+NativeThreadLinux::GetName()
+{
+ NativeProcessProtocolSP process_sp = m_process_wp.lock ();
+ if (!process_sp)
+ return "<unknown: no process>";
+
+ // const NativeProcessLinux *const process = reinterpret_cast<NativeProcessLinux*> (process_sp->get ());
+ return Host::GetThreadName (process_sp->GetID (), GetID ()).c_str ();
+}
+
+lldb::StateType
+NativeThreadLinux::GetState ()
+{
+ return m_state;
+}
+
+
+bool
+NativeThreadLinux::GetStopReason (ThreadStopInfo &stop_info)
+{
+ Log *log (GetLogIfAllCategoriesSet (LIBLLDB_LOG_THREAD));
+ switch (m_state)
+ {
+ case eStateStopped:
+ case eStateCrashed:
+ case eStateExited:
+ case eStateSuspended:
+ case eStateUnloaded:
+ if (log)
+ LogThreadStopInfo (*log, m_stop_info, "m_stop_info in thread: ");
+ stop_info = m_stop_info;
+ if (log)
+ LogThreadStopInfo (*log, stop_info, "returned stop_info: ");
+ return true;
+
+ case eStateInvalid:
+ case eStateConnected:
+ case eStateAttaching:
+ case eStateLaunching:
+ case eStateRunning:
+ case eStateStepping:
+ case eStateDetached:
+ default:
+ if (log)
+ {
+ log->Printf ("NativeThreadLinux::%s tid %" PRIu64 " in state %s cannot answer stop reason",
+ __FUNCTION__, GetID (), StateAsCString (m_state));
+ }
+ return false;
+ }
+}
+
+lldb_private::NativeRegisterContextSP
+NativeThreadLinux::GetRegisterContext ()
+{
+ // Return the register context if we already created it.
+ if (m_reg_context_sp)
+ return m_reg_context_sp;
+
+ // First select the appropriate RegisterInfoInterface.
+ RegisterInfoInterface *reg_interface = nullptr;
+ NativeProcessProtocolSP m_process_sp = m_process_wp.lock ();
+ if (!m_process_sp)
+ return NativeRegisterContextSP ();
+
+ ArchSpec target_arch;
+ if (!m_process_sp->GetArchitecture (target_arch))
+ return NativeRegisterContextSP ();
+
+ switch (target_arch.GetTriple().getOS())
+ {
+ case llvm::Triple::Linux:
+ switch (target_arch.GetMachine())
+ {
+ case llvm::Triple::x86:
+ case llvm::Triple::x86_64:
+ if (Host::GetArchitecture().GetAddressByteSize() == 4)
+ {
+ // 32-bit hosts run with a RegisterContextLinux_i386 context.
+ reg_interface = static_cast<RegisterInfoInterface*>(new RegisterContextLinux_i386(target_arch));
+ }
+ else
+ {
+ assert((Host::GetArchitecture ().GetAddressByteSize () == 8) && "Register setting path assumes this is a 64-bit host");
+ // X86_64 hosts know how to work with 64-bit and 32-bit EXEs using the x86_64 register context.
+ reg_interface = static_cast<RegisterInfoInterface*> (new RegisterContextLinux_x86_64 (target_arch));
+ }
+ break;
+ default:
+ break;
+ }
+ break;
+ default:
+ break;
+ }
+
+ assert(reg_interface && "OS or CPU not supported!");
+ if (!reg_interface)
+ return NativeRegisterContextSP ();
+
+ // Now create the register context.
+ switch (target_arch.GetMachine())
+ {
+#if 0
+ case llvm::Triple::mips64:
+ {
+ RegisterContextPOSIXProcessMonitor_mips64 *reg_ctx = new RegisterContextPOSIXProcessMonitor_mips64(*this, 0, reg_interface);
+ m_posix_thread = reg_ctx;
+ m_reg_context_sp.reset(reg_ctx);
+ break;
+ }
+#endif
+#if 0
+ case llvm::Triple::x86:
+#endif
+ case llvm::Triple::x86_64:
+ {
+ const uint32_t concrete_frame_idx = 0;
+ m_reg_context_sp.reset (new NativeRegisterContextLinux_x86_64(*this, concrete_frame_idx, reg_interface));
+ break;
+ }
+ default:
+ break;
+ }
+
+ return m_reg_context_sp;
+}
+
+Error
+NativeThreadLinux::SetWatchpoint (lldb::addr_t addr, size_t size, uint32_t watch_flags, bool hardware)
+{
+ // TODO implement
+ return Error ("not implemented");
+}
+
+Error
+NativeThreadLinux::RemoveWatchpoint (lldb::addr_t addr)
+{
+ // TODO implement
+ return Error ("not implemented");
+}
+
+void
+NativeThreadLinux::SetLaunching ()
+{
+ const StateType new_state = StateType::eStateLaunching;
+ MaybeLogStateChange (new_state);
+ m_state = new_state;
+
+ // Also mark it as stopped since launching temporarily stops the newly created thread
+ // in the ptrace machinery.
+ m_stop_info.reason = StopReason::eStopReasonSignal;
+ m_stop_info.details.signal.signo = SIGSTOP;
+}
+
+
+void
+NativeThreadLinux::SetRunning ()
+{
+ const StateType new_state = StateType::eStateRunning;
+ MaybeLogStateChange (new_state);
+ m_state = new_state;
+
+ m_stop_info.reason = StopReason::eStopReasonNone;
+}
+
+void
+NativeThreadLinux::SetStepping ()
+{
+ const StateType new_state = StateType::eStateStepping;
+ MaybeLogStateChange (new_state);
+ m_state = new_state;
+
+ m_stop_info.reason = StopReason::eStopReasonNone;
+}
+
+void
+NativeThreadLinux::SetStoppedBySignal (uint32_t signo)
+{
+ Log *log (GetLogIfAllCategoriesSet (LIBLLDB_LOG_THREAD));
+ if (log)
+ log->Printf ("NativeThreadLinux::%s called with signal 0x%" PRIx32, __FUNCTION__, signo);
+
+ const StateType new_state = StateType::eStateStopped;
+ MaybeLogStateChange (new_state);
+ m_state = new_state;
+
+ m_stop_info.reason = StopReason::eStopReasonSignal;
+ m_stop_info.details.signal.signo = signo;
+}
+
+void
+NativeThreadLinux::SetStoppedByBreakpoint ()
+{
+ const StateType new_state = StateType::eStateStopped;
+ MaybeLogStateChange (new_state);
+ m_state = new_state;
+
+ m_stop_info.reason = StopReason::eStopReasonSignal;
+ m_stop_info.details.signal.signo = SIGTRAP;
+}
+
+bool
+NativeThreadLinux::IsStoppedAtBreakpoint ()
+{
+ // Are we stopped? If not, this can't be a breakpoint.
+ if (GetState () != StateType::eStateStopped)
+ return false;
+
+ // Was the stop reason a signal with signal number SIGTRAP? If not, not a breakpoint.
+ return (m_stop_info.reason == StopReason::eStopReasonSignal) &&
+ (m_stop_info.details.signal.signo == SIGTRAP);
+}
+
+void
+NativeThreadLinux::SetCrashedWithException (uint64_t exception_type, lldb::addr_t exception_addr)
+{
+ const StateType new_state = StateType::eStateCrashed;
+ MaybeLogStateChange (new_state);
+ m_state = new_state;
+
+ m_stop_info.reason = StopReason::eStopReasonException;
+ m_stop_info.details.exception.type = exception_type;
+ m_stop_info.details.exception.data_count = 1;
+ m_stop_info.details.exception.data[0] = exception_addr;
+}
+
+
+void
+NativeThreadLinux::SetSuspended ()
+{
+ const StateType new_state = StateType::eStateSuspended;
+ MaybeLogStateChange (new_state);
+ m_state = new_state;
+
+ // FIXME what makes sense here? Do we need a suspended StopReason?
+ m_stop_info.reason = StopReason::eStopReasonNone;
+}
+
+void
+NativeThreadLinux::SetExited ()
+{
+ const StateType new_state = StateType::eStateExited;
+ MaybeLogStateChange (new_state);
+ m_state = new_state;
+
+ m_stop_info.reason = StopReason::eStopReasonThreadExiting;
+}
+
+void
+NativeThreadLinux::MaybeLogStateChange (lldb::StateType new_state)
+{
+ Log *log (GetLogIfAllCategoriesSet (LIBLLDB_LOG_THREAD));
+ // If we're not logging, we're done.
+ if (!log)
+ return;
+
+ // If this is a state change to the same state, we're done.
+ lldb::StateType old_state = m_state;
+ if (new_state == old_state)
+ return;
+
+ NativeProcessProtocolSP m_process_sp = m_process_wp.lock ();
+ lldb::pid_t pid = m_process_sp ? m_process_sp->GetID () : LLDB_INVALID_PROCESS_ID;
+
+ // Log it.
+ log->Printf ("NativeThreadLinux: thread (pid=%" PRIu64 ", tid=%" PRIu64 ") changing from state %s to %s", pid, GetID (), StateAsCString (old_state), StateAsCString (new_state));
+}
+
+static
+uint32_t MaybeTranslateHostSignoToGdbSigno (uint32_t host_signo)
+{
+ switch (host_signo)
+ {
+ case SIGSEGV: return eGdbSignalBadAccess;
+ case SIGILL: return eGdbSignalBadInstruction;
+ case SIGFPE: return eGdbSignalArithmetic;
+ // NOTE: debugserver sends SIGTRAP through unmodified. Do the same here.
+ // case SIGTRAP: return eGdbSignalBreakpoint;
+
+ // Nothing for eGdbSignalSoftware (0x95).
+ // Nothing for eGdbSignalEmulation (0x94).
+
+ default:
+ // No translations.
+ return host_signo;
+ }
+}
+
+uint32_t
+NativeThreadLinux::TranslateStopInfoToGdbSignal (const ThreadStopInfo &stop_info) const
+{
+ switch (stop_info.reason)
+ {
+ case eStopReasonSignal:
+ return MaybeTranslateHostSignoToGdbSigno (stop_info.details.signal.signo);
+ break;
+
+ case eStopReasonException:
+ // FIXME verify how we handle exception type.
+ return MaybeTranslateHostSignoToGdbSigno (static_cast<uint32_t> (stop_info.details.exception.type));
+ break;
+
+ default:
+ assert (0 && "unexpected stop_info.reason found");
+ return 0;
+ }
+}
+