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Code Issues Releases Activity

dmnt-cheat: fix decode error, add debug logging

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This commit is contained in:
Michael Scire 2019-03-04 01:41:01 -08:00
parent f2f25dd5ed
commit e8a5aa81f4
3 changed files with 143 additions and 5 deletions
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1
stratosphere/dmnt/source/dmnt_cheat_manager.cpp
View file

@ -193,7 +193,6 @@ void DmntCheatManager::OnNewApplicationLaunch() {
/* TODO: Read cheats off the SD. */
/* Open a debug handle. */
if (R_FAILED((rc = svcDebugActiveProcess(&g_cheat_process_debug_hnd, g_cheat_process_metadata.process_id)))) {
fatalSimple(rc);

136
stratosphere/dmnt/source/dmnt_cheat_vm.cpp
View file

@ -19,6 +19,119 @@
#include "dmnt_cheat_vm.hpp"
#include "dmnt_cheat_manager.hpp"
void DmntCheatVm::OpenDebugLogFile() {
#ifdef DMNT_CHEAT_VM_DEBUG_LOG
CloseDebugLogFile();
this->debug_log_file = fopen("cheat_vm_log.txt", "wb");
#endif
}
void DmntCheatVm::CloseDebugLogFile() {
#ifdef DMNT_CHEAT_VM_DEBUG_LOG
if (this->debug_log_file != NULL) {
fclose(this->debug_log_file);
this->debug_log_file = NULL;
}
#endif
}
void DmntCheatVm::LogToDebugFile(const char *format, ...) {
#ifdef DMNT_CHEAT_VM_DEBUG_LOG
if (this->debug_log_file != NULL) {
va_list arglist;
va_start(arglist, format);
vfprintf(this->debug_log_file, format, arglist);
va_end(arglist);
}
#endif
}
void DmntCheatVm::LogOpcode(const CheatVmOpcode *opcode) {
#ifndef DMNT_CHEAT_VM_DEBUG_LOG
return;
#endif
switch (opcode->opcode) {
case CheatVmOpcodeType_StoreStatic:
this->LogToDebugFile("Opcode: Store Static\n");
this->LogToDebugFile("Bit Width: %x\n", opcode->store_static.bit_width);
this->LogToDebugFile("Mem Type: %x\n", opcode->store_static.mem_type);
this->LogToDebugFile("Reg Idx: %x\n", opcode->store_static.offset_register);
this->LogToDebugFile("Rel Addr: %lx\n", opcode->store_static.rel_address);
this->LogToDebugFile("Value: %lx\n", opcode->store_static.value.bit64);
break;
case CheatVmOpcodeType_BeginConditionalBlock:
this->LogToDebugFile("Opcode: Begin Conditional\n");
this->LogToDebugFile("Bit Width: %x\n", opcode->begin_cond.bit_width);
this->LogToDebugFile("Mem Type: %x\n", opcode->begin_cond.mem_type);
this->LogToDebugFile("Cond Type: %x\n", opcode->begin_cond.cond_type);
this->LogToDebugFile("Rel Addr: %lx\n", opcode->begin_cond.rel_address);
this->LogToDebugFile("Value: %lx\n", opcode->begin_cond.value.bit64);
break;
case CheatVmOpcodeType_EndConditionalBlock:
this->LogToDebugFile("Opcode: End Conditional\n");
break;
case CheatVmOpcodeType_ControlLoop:
if (opcode->ctrl_loop.start_loop) {
this->LogToDebugFile("Opcode: Start Loop\n");
this->LogToDebugFile("Reg Idx: %x\n", opcode->ctrl_loop.reg_index);
this->LogToDebugFile("Num Iters: %x\n", opcode->ctrl_loop.num_iters);
} else {
this->LogToDebugFile("Opcode: End Loop\n");
this->LogToDebugFile("Reg Idx: %x\n", opcode->ctrl_loop.reg_index);
}
break;
case CheatVmOpcodeType_LoadRegisterStatic:
this->LogToDebugFile("Opcode: Load Register Static\n");
this->LogToDebugFile("Reg Idx: %x\n", opcode->ldr_static.reg_index);
this->LogToDebugFile("Value: %lx\n", opcode->ldr_static.value);
break;
case CheatVmOpcodeType_LoadRegisterMemory:
this->LogToDebugFile("Opcode: Load Register Memory\n");
this->LogToDebugFile("Bit Width: %x\n", opcode->ldr_memory.bit_width);
this->LogToDebugFile("Reg Idx: %x\n", opcode->ldr_memory.reg_index);
this->LogToDebugFile("Mem Type: %x\n", opcode->ldr_memory.mem_type);
this->LogToDebugFile("From Reg: %d\n", opcode->ldr_memory.load_from_reg);
this->LogToDebugFile("Rel Addr: %lx\n", opcode->ldr_memory.rel_address);
break;
case CheatVmOpcodeType_StoreToRegisterAddress:
this->LogToDebugFile("Opcode: Store Static to Register Address\n");
this->LogToDebugFile("Bit Width: %x\n", opcode->str_regaddr.bit_width);
this->LogToDebugFile("Reg Idx: %x\n", opcode->str_regaddr.reg_index);
if (opcode->str_regaddr.add_offset_reg) {
this->LogToDebugFile("O Reg Idx: %x\n", opcode->str_regaddr.offset_reg_index);
}
this->LogToDebugFile("Incr Reg: %d\n", opcode->str_regaddr.increment_reg);
this->LogToDebugFile("Value: %lx\n", opcode->str_regaddr.value);
break;
case CheatVmOpcodeType_PerformArithmeticStatic:
this->LogToDebugFile("Opcode: Perform Static Arithmetic\n");
this->LogToDebugFile("Bit Width: %x\n", opcode->perform_math_static.bit_width);
this->LogToDebugFile("Reg Idx: %x\n", opcode->perform_math_static.reg_index);
this->LogToDebugFile("Math Type: %x\n", opcode->perform_math_static.math_type);
this->LogToDebugFile("Value: %lx\n", opcode->perform_math_static.value);
break;
case CheatVmOpcodeType_BeginKeypressConditionalBlock:
this->LogToDebugFile("Opcode: Begin Keypress Conditional\n");
this->LogToDebugFile("Key Mask: %x\n", opcode->begin_keypress_cond.key_mask);
break;
case CheatVmOpcodeType_PerformArithmeticRegister:
this->LogToDebugFile("Opcode: Perform Register Arithmetic\n");
this->LogToDebugFile("Bit Width: %x\n", opcode->perform_math_reg.bit_width);
this->LogToDebugFile("Dst Idx: %x\n", opcode->perform_math_reg.dst_reg_index);
this->LogToDebugFile("Src1 Idx: %x\n", opcode->perform_math_reg.src_reg_1_index);
if (opcode->perform_math_reg.has_immediate) {
this->LogToDebugFile("Value: %lx\n", opcode->perform_math_reg.value.bit64);
} else {
this->LogToDebugFile("Src2 Idx: %x\n", opcode->perform_math_reg.src_reg_2_index);
}
break;
default:
this->LogToDebugFile("Unknown opcode: %x\n", opcode->opcode);
break;
}
}
bool DmntCheatVm::DecodeNextOpcode(CheatVmOpcode *out) {
/* If we've ever seen a decode failure, return false. */
bool valid = this->decode_success;
@ -131,7 +244,7 @@ bool DmntCheatVm::DecodeNextOpcode(CheatVmOpcode *out) {
opcode.ldr_memory.bit_width = (first_dword >> 24) & 0xF;
opcode.ldr_memory.mem_type = (MemoryAccessType)((first_dword >> 20) & 0xF);
opcode.ldr_memory.reg_index = ((first_dword >> 16) & 0xF);
opcode.ldr_memory.load_from_reg = ((first_dword >> 12) & 0xF) == 0;
opcode.ldr_memory.load_from_reg = ((first_dword >> 12) & 0xF) != 0;
opcode.ldr_memory.rel_address = ((u64)(first_dword & 0xFF) << 32ul) | ((u64)second_dword);
}
break;
@ -141,8 +254,8 @@ bool DmntCheatVm::DecodeNextOpcode(CheatVmOpcode *out) {
/* Read additional words. */
opcode.str_regaddr.bit_width = (first_dword >> 24) & 0xF;
opcode.str_regaddr.reg_index = ((first_dword >> 16) & 0xF);
opcode.str_regaddr.increment_reg = ((first_dword >> 12) & 0xF) == 0;
opcode.str_regaddr.add_offset_reg = ((first_dword >> 8) & 0xF) == 0;
opcode.str_regaddr.increment_reg = ((first_dword >> 12) & 0xF) != 0;
opcode.str_regaddr.add_offset_reg = ((first_dword >> 8) & 0xF) != 0;
opcode.str_regaddr.offset_reg_index = ((first_dword >> 4) & 0xF);
opcode.str_regaddr.value = (((u64)GetNextDword()) << 32ul) | ((u64)GetNextDword());
}
@ -171,7 +284,7 @@ bool DmntCheatVm::DecodeNextOpcode(CheatVmOpcode *out) {
opcode.perform_math_reg.math_type = (RegisterArithmeticType)((first_dword >> 20) & 0xF);
opcode.perform_math_reg.dst_reg_index = ((first_dword >> 16) & 0xF);
opcode.perform_math_reg.src_reg_1_index = ((first_dword >> 12) & 0xF);
opcode.perform_math_reg.has_immediate = ((first_dword >> 8) & 0xF) == 0;
opcode.perform_math_reg.has_immediate = ((first_dword >> 8) & 0xF) != 0;
if (opcode.perform_math_reg.has_immediate) {
opcode.perform_math_reg.src_reg_2_index = 0;
opcode.perform_math_reg.value = GetNextVmInt(opcode.perform_math_reg.bit_width);
@ -245,11 +358,26 @@ void DmntCheatVm::Execute(const CheatProcessMetadata *metadata) {
/* TODO: Get Keys down. */
this->OpenDebugLogFile();
ON_SCOPE_EXIT { this->CloseDebugLogFile(); };
this->LogToDebugFile("Started VM execution.\n");
this->LogToDebugFile("Main NSO: %012lx\n", metadata->main_nso_extents.base);
this->LogToDebugFile("Heap: %012lx\n", metadata->main_nso_extents.base);
/* Clear VM state. */
this->ResetState();
/* Loop until program finishes. */
while (this->DecodeNextOpcode(&cur_opcode)) {
this->LogToDebugFile("Instruction Ptr: %04x\n", (u32)this->instruction_ptr);
for (size_t i = 0; i < NumRegisters; i++) {
this->LogToDebugFile("Registers[%02x]: %016lx\n", i, this->registers[i]);
}
this->LogOpcode(&cur_opcode);
switch (cur_opcode.opcode) {
case CheatVmOpcodeType_StoreStatic:
{

11
stratosphere/dmnt/source/dmnt_cheat_vm.hpp
View file

@ -16,6 +16,7 @@
#pragma once
#include <switch.h>
#include <stdarg.h>
#include <stratosphere.hpp>
#include "dmnt_cheat_types.hpp"
@ -171,6 +172,12 @@ class DmntCheatVm {
void SkipConditionalBlock();
void ResetState();
/* For debugging. These will be IFDEF'd out normally. */
void OpenDebugLogFile();
void CloseDebugLogFile();
void LogToDebugFile(const char *format, ...);
void LogOpcode(const CheatVmOpcode *opcode);
static u64 GetVmInt(VmInt value, u32 bit_width);
static u64 GetCheatProcessAddress(const CheatProcessMetadata* metadata, MemoryAccessType mem_type, u64 rel_address);
public:
@ -181,4 +188,8 @@ class DmntCheatVm {
}
void Execute(const CheatProcessMetadata *metadata);
#ifdef DMNT_CHEAT_VM_DEBUG_LOG
private:
FILE *debug_log_file = NULL;
#endif
};