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dmnt: first pass at breakpoints/watchpoints

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This commit is contained in:
Michael Scire 2021-07-22 00:51:28 -07:00 • committed by SciresM
parent 1401f3520e
commit d216a77187
15 changed files with 1606 additions and 5 deletions
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195
stratosphere/dmnt.gen2/source/dmnt2_debug_process.cpp
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@ -19,6 +19,14 @@
namespace ams::dmnt {
namespace {
s32 SignExtend(u32 value, u32 bits) {
return static_cast<s32>(value << (32 - bits)) >> (32 - bits);
}
}
Result DebugProcess::Attach(os::ProcessId process_id) {
/* Attach to the process. */
R_TRY(svc::DebugActiveProcess(std::addressof(m_debug_handle), process_id.value));
@ -39,6 +47,10 @@ namespace ams::dmnt {
void DebugProcess::Detach() {
if (m_is_valid) {
m_software_breakpoints.ClearAll();
m_hardware_breakpoints.ClearAll();
m_hardware_watchpoints.ClearAll();
R_ABORT_UNLESS(svc::CloseHandle(m_debug_handle));
m_debug_handle = svc::InvalidHandle;
}
@ -213,6 +225,189 @@ namespace ams::dmnt {
return svc::WriteDebugProcessMemory(m_debug_handle, reinterpret_cast<uintptr_t>(src), address, size);
}
Result DebugProcess::Continue() {
AMS_DMNT2_GDB_LOG_DEBUG("DebugProcess::Continue() all\n");
u64 thread_ids[] = { 0 };
R_TRY(svc::ContinueDebugEvent(m_debug_handle, svc::ContinueFlag_ExceptionHandled | svc::ContinueFlag_EnableExceptionEvent | svc::ContinueFlag_ContinueAll, thread_ids, util::size(thread_ids)));
m_continue_thread_id = 0;
m_status = ProcessStatus_Running;
this->SetLastThreadId(0);
this->SetLastSignal(GdbSignal_Signal0);
return ResultSuccess();
}
Result DebugProcess::Continue(u64 thread_id) {
AMS_DMNT2_GDB_LOG_DEBUG("DebugProcess::Continue() thread_id=%lx\n", thread_id);
u64 thread_ids[] = { thread_id };
R_TRY(svc::ContinueDebugEvent(m_debug_handle, svc::ContinueFlag_ExceptionHandled | svc::ContinueFlag_EnableExceptionEvent, thread_ids, util::size(thread_ids)));
m_continue_thread_id = thread_id;
m_status = ProcessStatus_Running;
this->SetLastThreadId(0);
this->SetLastSignal(GdbSignal_Signal0);
return ResultSuccess();
}
Result DebugProcess::Step() {
AMS_DMNT2_GDB_LOG_DEBUG("DebugProcess::Step() all\n");
return this->Step(this->GetLastThreadId());
}
Result DebugProcess::Step(u64 thread_id) {
AMS_DMNT2_GDB_LOG_DEBUG("DebugProcess::Step() thread_id=%lx\n", thread_id);
/* Get the thread context. */
svc::ThreadContext ctx;
R_TRY(this->GetThreadContext(std::addressof(ctx), thread_id, svc::ThreadContextFlag_Control));
/* 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);
/* 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));
}
if (step_target) {
R_TRY(m_step_breakpoints.SetBreakPoint(step_target, sizeof(u32), true));
}
bp_guard.Cancel();
return ResultSuccess();
}
void DebugProcess::ClearStep() {
/* If we should, clear our step breakpoints. */
if (m_stepping) {
m_step_breakpoints.ClearStep();
m_stepping = false;
}
}
Result DebugProcess::Break() {
if (this->GetStatus() == ProcessStatus_Running) {
AMS_DMNT2_GDB_LOG_DEBUG("DebugProcess::Break\n");
return svc::BreakDebugProcess(m_debug_handle);
} else {
AMS_DMNT2_GDB_LOG_ERROR("DebugProcess::Break called on non-running process!\n");
return ResultSuccess();
}
}
void DebugProcess::GetBranchTarget(svc::ThreadContext &ctx, u64 thread_id, u64 &current_pc, u64 &target) {
/* Save pc, in case we modify it. */
const u64 pc = current_pc;
/* Clear the target. */
target = 0;
/* By default, we advance by four. */
current_pc += 4;
/* Get the instruction where we were. */
u32 insn = 0;
this->ReadMemory(std::addressof(insn), pc, sizeof(insn));
/* Handle by architecture. */
bool is_call = false;
if (this->Is64Bit()) {
if ((insn & 0x7C000000) == 0x14000000) {
/* Unconditional branch (b/bl) */
if (insn != 0x14000001) {
is_call = (insn & 0x80000000) == 0x80000000;
current_pc = 0;
target = SignExtend(((insn & 0x03FFFFFF) << 2), 28) + pc;
}
} else if ((insn & 0x7E000000) == 0x34000000) {
/* Compare/Branch (cbz/cbnz) */
target = SignExtend(((insn & 0x00FFFFE0) >> 3), 21) + pc;
} else if ((insn & 0x7E000000) == 0x36000000) {
/* Test and branch (tbz/tbnz) */
target = SignExtend(((insn & 0x0007FFE0) >> 3), 16) + pc;
} else if ((insn & 0xFF000010) == 0x54000000) {
/* Conditional branch (b.*) */
if ((insn & 0xF) == 0xE) {
/* Unconditional. */
current_pc = 0;
}
target = SignExtend(((insn & 0x00FFFFE0) >> 3), 21) + pc;
} else if ((insn & 0xFF8FFC1F) == 0xD60F0000) {
/* Unconditional branch */
is_call = (insn & 0x00F00000) == 0x00300000;
if (!is_call) {
current_pc = 0;
}
/* Get the register. */
svc::ThreadContext new_ctx;
if (R_SUCCEEDED(this->GetThreadContext(std::addressof(new_ctx), thread_id, svc::ThreadContextFlag_Control | svc::ThreadContextFlag_General))) {
const int reg = (insn & 0x03E0) >> 5;
if (reg < 29) {
target = new_ctx.r[reg];
} else if (reg == 29) {
target = new_ctx.fp;
} else if (reg == 30) {
target = new_ctx.lr;
} else if (reg == 31) {
target = new_ctx.sp;
}
}
}
} else {
/* TODO aarch32 branch decoding */
}
}
Result DebugProcess::SetBreakPoint(uintptr_t address, size_t size, bool is_step) {
return m_software_breakpoints.SetBreakPoint(address, size, is_step);
}
Result DebugProcess::ClearBreakPoint(uintptr_t address, size_t size) {
m_software_breakpoints.ClearBreakPoint(address, size);
return ResultSuccess();
}
Result DebugProcess::SetHardwareBreakPoint(uintptr_t address, size_t size, bool is_step) {
return m_hardware_breakpoints.SetBreakPoint(address, size, is_step);
}
Result DebugProcess::ClearHardwareBreakPoint(uintptr_t address, size_t size) {
m_hardware_breakpoints.ClearBreakPoint(address, size);
return ResultSuccess();
}
Result DebugProcess::SetWatchPoint(u64 address, u64 size, bool read, bool write) {
return m_hardware_watchpoints.SetWatchPoint(address, size, read, write);
}
Result DebugProcess::ClearWatchPoint(u64 address, u64 size) {
return m_hardware_watchpoints.ClearBreakPoint(address, size);
}
Result DebugProcess::GetWatchPointInfo(u64 address, bool &read, bool &write) {
return m_hardware_watchpoints.GetWatchPointInfo(address, read, write);
}
bool DebugProcess::IsValidWatchPoint(u64 address, u64 size) {
return HardwareWatchPointManager::IsValidWatchPoint(address, size);
}
Result DebugProcess::GetThreadCurrentCore(u32 *out, u64 thread_id) {
u64 dummy_value;
u32 val32 = 0;