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dmnt: use hardware single step extension if available

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This commit is contained in:
Michael Scire 2021-07-27 05:34:51 -07:00
parent ae91a32059
commit 6139b7d5ac
2 changed files with 28 additions and 17 deletions
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36
stratosphere/dmnt.gen2/source/dmnt2_debug_process.cpp
View file

@ -273,25 +273,31 @@ namespace ams::dmnt {
/* Note that we're stepping. */
m_stepping = true;
/* Determine where we're stepping to. */
u64 current_pc = ctx.pc;
u64 step_target = 0;
this->GetBranchTarget(ctx, thread_id, current_pc, step_target);
if (m_use_hardware_single_step) {
/* Set thread single step. */
R_TRY(this->SetThreadContext(std::addressof(ctx), thread_id, svc::ThreadContextFlag_SetSingleStep));
} else {
/* Determine where we're stepping to. */
u64 current_pc = ctx.pc;
u64 step_target = 0;
this->GetBranchTarget(ctx, thread_id, current_pc, step_target);
/* Ensure we end with valid breakpoints. */
auto bp_guard = SCOPE_GUARD { this->ClearStep(); };
/* Ensure we end with valid breakpoints. */
auto bp_guard = SCOPE_GUARD { this->ClearStep(); };
/* Set step breakpoint on current pc. */
/* TODO: aarch32 breakpoints. */
if (current_pc) {
R_TRY(m_step_breakpoints.SetBreakPoint(current_pc, sizeof(u32), true));
/* Set step breakpoint on current pc. */
/* TODO: aarch32 breakpoints. */
if (current_pc) {
R_TRY(m_step_breakpoints.SetBreakPoint(current_pc, sizeof(u32), true));
}
if (step_target) {
R_TRY(m_step_breakpoints.SetBreakPoint(step_target, sizeof(u32), true));
}
bp_guard.Cancel();
}
if (step_target) {
R_TRY(m_step_breakpoints.SetBreakPoint(step_target, sizeof(u32), true));
}
bp_guard.Cancel();
return ResultSuccess();
}

9
stratosphere/dmnt.gen2/source/dmnt2_debug_process.hpp
View file

@ -52,6 +52,7 @@ namespace ams::dmnt {
u64 m_continue_thread_id{};
GdbSignal m_last_signal{};
bool m_stepping{false};
bool m_use_hardware_single_step{false};
bool m_thread_valid[ThreadCountMax]{};
u64 m_thread_ids[ThreadCountMax]{};
osdbg::ThreadInfo m_thread_infos[ThreadCountMax]{};
@ -64,8 +65,12 @@ namespace ams::dmnt {
size_t m_module_count{};
size_t m_main_module{};
public:
/* TODO: ifdef for hardware breakpoints. */
DebugProcess() : m_software_breakpoints(this), m_hardware_breakpoints(this), m_hardware_watchpoints(this), m_step_breakpoints(m_software_breakpoints) { /* ... */ }
DebugProcess() : m_software_breakpoints(this), m_hardware_breakpoints(this), m_hardware_watchpoints(this), m_step_breakpoints(m_software_breakpoints) {
if (svc::IsKernelMesosphere()) {
uint64_t value = 0;
m_use_hardware_single_step = R_SUCCEEDED(::ams::svc::GetInfo(std::addressof(value), ::ams::svc::InfoType_MesosphereMeta, ::ams::svc::InvalidHandle, ::ams::svc::MesosphereMetaInfo_IsSingleStepEnabled)) && value != 0;
}
}
~DebugProcess() { this->Detach(); }
svc::Handle GetHandle() const { return m_debug_handle; }