Add support for tracing hello-world application on NetBSD
Summary:
This patch is a stripped down from features a NetBSD process
code (patch is kept under 2k LOC). This code has assumption that
there is only one thread within a debugged process. The only
debugger trap supported is software breakpoint (TRAP_BRKPT).
The generic platform code requires to add dummy function for
watchpoints etc. These functions are currently empty.
This code is not the final platform support as is and it's treated as
a base to extend, refactor and address issues afterwards.
Supported features:
- handle software breakpoints,
- correctly attach to a tracee,
- support NetBSD specific ptrace(2),
- monitor process termination,
- monitor SIGTRAP events,
- monitor SIGSTOP events,
- monitor other signals events,
- resume the whole process,
- get memory region info perms,
- read memory from tracee,
- write memory to tracee,
- read ELF AUXV,
- x86_64 GPR read and write code
For the generic framework include:
- halt,
- detach,
- signal,
- kill,
- allocatememory,
- deallocatememory,
- update threads,
- getarchitecture,
- getfileloadaddress,
- and others.
This code has preliminary AddThread code.
Out of interest in this patch:
- exec() traps,
- hardware debug register traps,
- single step trap,
- thread creation/termination trap,
- process fork(2), vfork(2) and vfork(2) done traps,
- syscall entry and exit trap,
- threads,
- FPR registers,
- retrieving tracee's thread name,
- non x86_64 support.
This code can be used to start a hello world application and trace it.
This code can be used by other BSD systems as a starting point to get similar
capabilities.
Sponsored by <The NetBSD Foundation>
Reviewers: emaste, joerg, kettenis, labath
Subscribers: mgorny, #lldb
Tags: #lldb
Differential Revision: https://reviews.llvm.org/D31374
llvm-svn: 298953
diff --git a/lldb/source/Plugins/Process/NetBSD/NativeThreadNetBSD.cpp b/lldb/source/Plugins/Process/NetBSD/NativeThreadNetBSD.cpp
index 1646337..8493e98 100644
--- a/lldb/source/Plugins/Process/NetBSD/NativeThreadNetBSD.cpp
+++ b/lldb/source/Plugins/Process/NetBSD/NativeThreadNetBSD.cpp
@@ -12,10 +12,131 @@
#include "NativeProcessNetBSD.h"
+#include "Plugins/Process/POSIX/CrashReason.h"
+#include "Plugins/Process/POSIX/ProcessPOSIXLog.h"
+#include "lldb/Core/RegisterValue.h"
+#include "lldb/Core/State.h"
+
using namespace lldb;
using namespace lldb_private;
using namespace lldb_private::process_netbsd;
NativeThreadNetBSD::NativeThreadNetBSD(NativeProcessNetBSD *process,
lldb::tid_t tid)
- : NativeThreadProtocol(process, tid) {}
+ : NativeThreadProtocol(process, tid), m_state(StateType::eStateInvalid),
+ m_stop_info(), m_reg_context_sp(), m_stop_description() {}
+
+void NativeThreadNetBSD::SetStoppedBySignal(uint32_t signo,
+ const siginfo_t *info) {
+ Log *log(ProcessPOSIXLog::GetLogIfAllCategoriesSet(POSIX_LOG_THREAD));
+ LLDB_LOG(log, "tid = {0} in called with signal {1}", GetID(), signo);
+
+ SetStopped();
+
+ m_stop_info.reason = StopReason::eStopReasonSignal;
+ m_stop_info.details.signal.signo = signo;
+
+ m_stop_description.clear();
+ if (info) {
+ switch (signo) {
+ case SIGSEGV:
+ case SIGBUS:
+ case SIGFPE:
+ case SIGILL:
+ const auto reason = GetCrashReason(*info);
+ m_stop_description = GetCrashReasonString(reason, *info);
+ break;
+ }
+ }
+}
+
+void NativeThreadNetBSD::SetStoppedByBreakpoint() {
+ SetStopped();
+ m_stop_info.reason = StopReason::eStopReasonBreakpoint;
+ m_stop_info.details.signal.signo = SIGTRAP;
+}
+
+void NativeThreadNetBSD::SetStopped() {
+ const StateType new_state = StateType::eStateStopped;
+ m_state = new_state;
+ m_stop_description.clear();
+}
+
+void NativeThreadNetBSD::SetRunning() {
+ m_state = StateType::eStateRunning;
+ m_stop_info.reason = StopReason::eStopReasonNone;
+}
+
+std::string NativeThreadNetBSD::GetName() { return std::string(""); }
+
+lldb::StateType NativeThreadNetBSD::GetState() { return m_state; }
+
+bool NativeThreadNetBSD::GetStopReason(ThreadStopInfo &stop_info,
+ std::string &description) {
+ Log *log(ProcessPOSIXLog::GetLogIfAllCategoriesSet(POSIX_LOG_THREAD));
+
+ description.clear();
+
+ switch (m_state) {
+ case eStateStopped:
+ case eStateCrashed:
+ case eStateExited:
+ case eStateSuspended:
+ case eStateUnloaded:
+ stop_info = m_stop_info;
+ description = m_stop_description;
+
+ return true;
+
+ case eStateInvalid:
+ case eStateConnected:
+ case eStateAttaching:
+ case eStateLaunching:
+ case eStateRunning:
+ case eStateStepping:
+ case eStateDetached:
+ LLDB_LOG(log, "tid = {0} in state {1} cannot answer stop reason", GetID(),
+ StateAsCString(m_state));
+ return false;
+ }
+ llvm_unreachable("unhandled StateType!");
+}
+
+NativeRegisterContextSP NativeThreadNetBSD::GetRegisterContext() {
+ // Return the register context if we already created it.
+ if (m_reg_context_sp)
+ return m_reg_context_sp;
+
+ 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();
+
+ const uint32_t concrete_frame_idx = 0;
+ m_reg_context_sp.reset(
+ NativeRegisterContextNetBSD::CreateHostNativeRegisterContextNetBSD(
+ target_arch, *this, concrete_frame_idx));
+
+ return m_reg_context_sp;
+}
+
+Error NativeThreadNetBSD::SetWatchpoint(lldb::addr_t addr, size_t size,
+ uint32_t watch_flags, bool hardware) {
+ return Error("Unimplemented");
+}
+
+Error NativeThreadNetBSD::RemoveWatchpoint(lldb::addr_t addr) {
+ return Error("Unimplemented");
+}
+
+Error NativeThreadNetBSD::SetHardwareBreakpoint(lldb::addr_t addr,
+ size_t size) {
+ return Error("Unimplemented");
+}
+
+Error NativeThreadNetBSD::RemoveHardwareBreakpoint(lldb::addr_t addr) {
+ return Error("Unimplemented");
+}