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dmnt-cheat: Begin implementing Cheat VM.

This commit is contained in:
Michael Scire 2019-02-27 18:33:07 -08:00
parent f5ac895062
commit 2552c0327c
4 changed files with 277 additions and 2 deletions

View file

@ -16,12 +16,14 @@
#include <switch.h>
#include "dmnt_cheat_manager.hpp"
#include "dmnt_cheat_vm.hpp"
#include "pm_shim.h"
static HosMutex g_cheat_lock;
static HosThread g_detect_thread, g_vm_thread;
static IEvent *g_cheat_process_event;
static DmntCheatVm *g_cheat_vm;
static CheatProcessMetadata g_cheat_process_metadata = {0};
static Handle g_cheat_process_debug_hnd = 0;
@ -189,9 +191,13 @@ void DmntCheatManager::VmThread(void *arg) {
std::scoped_lock<HosMutex> lk(g_cheat_lock);
if (HasActiveCheatProcess()) {
/* Handle any pending debug events. */
ContinueCheatProcess();
/* TODO: Execute VM. */
/* Execute VM. */
if (g_cheat_vm->GetProgramSize() != 0) {
g_cheat_vm->Execute(&g_cheat_process_metadata);
}
}
}
svcSleepThread(0x5000000ul);
@ -224,6 +230,9 @@ void DmntCheatManager::InitializeCheatManager() {
/* Create cheat process detection event. */
g_cheat_process_event = CreateWriteOnlySystemEvent();
/* Create cheat vm. */
g_cheat_vm = new DmntCheatVm();
/* Spawn application detection thread, spawn cheat vm thread. */
if (R_FAILED(g_detect_thread.Initialize(&DmntCheatManager::DetectThread, nullptr, 0x4000, 28))) {
std::abort();

View file

@ -72,7 +72,7 @@ Result DmntCheatService::ToggleCheat(u32 cheat_id) {
return 0xF601;
}
Result DmntCheatService::AddCheat(InBuffer<CheatEntry> cheat) {
Result DmntCheatService::AddCheat(InBuffer<CheatDefinition> cheat, Out<u32> out_cheat_id, bool enabled) {
/* TODO */
return 0xF601;
}

View file

@ -0,0 +1,109 @@
/*
* Copyright (c) 2018 Atmosphère-NX
*
* This program is free software; you can redistribute it and/or modify it
* under the terms and conditions of the GNU General Public License,
* version 2, as published by the Free Software Foundation.
*
* This program is distributed in the hope it will be useful, but WITHOUT
* ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
* FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License for
* more details.
*
* You should have received a copy of the GNU General Public License
* along with this program. If not, see <http://www.gnu.org/licenses/>.
*/
#include <switch.h>
#include "dmnt_cheat_types.hpp"
#include "dmnt_cheat_vm.hpp"
bool DmntCheatVm::DecodeNextOpcode(CheatVmOpcode *out) {
/* TODO: Parse opcodes */
return false;
}
void DmntCheatVm::SkipConditionalBlock() {
CheatVmOpcode skip_opcode;
while (this->DecodeNextOpcode(&skip_opcode)) {
/* Decode instructions until we see end of conditional block. */
/* NOTE: This is broken in gateway's implementation. */
/* Gateway currently checks for "0x2" instead of "0x20000000" */
/* In addition, they do a linear scan instead of correctly decoding opcodes. */
/* This causes issues if "0x2" appears as an immediate in the conditional block... */
if (skip_opcode.opcode == CheatVmOpcodeType_EndConditionalBlock) {
break;
}
}
}
void DmntCheatVm::Execute(const CheatProcessMetadata *metadata) {
CheatVmOpcode cur_opcode;
u64 kDown = 0;
/* TODO: Get Keys down. */
/* Clear VM state. */
for (size_t i = 0; i < DmntCheatVm::NumRegisters; i++) {
this->registers[i] = 0;
this->loop_tops[i] = 0;
}
/* Loop until program finishes. */
while (this->DecodeNextOpcode(&cur_opcode)) {
switch (cur_opcode.opcode) {
case CheatVmOpcodeType_StoreStatic:
{
/* TODO */
}
break;
case CheatVmOpcodeType_BeginConditionalBlock:
{
/* TODO */
}
break;
case CheatVmOpcodeType_EndConditionalBlock:
/* There is nothing to do here. Just move on to the next instruction. */
break;
case CheatVmOpcodeType_ControlLoop:
if (cur_opcode.ctrl_loop.start_loop) {
/* Start a loop. */
this->registers[cur_opcode.ctrl_loop.register_index] = cur_opcode.ctrl_loop.num_iters;
this->loop_tops[cur_opcode.ctrl_loop.register_index] = this->instruction_ptr;
} else {
/* End a loop. */
this->registers[cur_opcode.ctrl_loop.register_index]--;
if (this->registers[cur_opcode.ctrl_loop.register_index] != 0) {
this->instruction_ptr = this->loop_tops[cur_opcode.ctrl_loop.register_index];
}
}
break;
case CheatVmOpcodeType_LoadRegisterStatic:
/* Set a register to a static value. */
this->registers[cur_opcode.ldr_static.register_index] = cur_opcode.ldr_static.value;
break;
case CheatVmOpcodeType_LoadRegisterMemory:
{
/* TODO */
}
break;
case CheatVmOpcodeType_StoreToRegisterAddress:
{
/* TODO */
}
break;
case CheatVmOpcodeType_PerformArithmetic:
{
/* TODO */
}
break;
case CheatVmOpcodeType_BeginKeypressConditionalBlock:
/* Check for keypress. */
if ((cur_opcode.begin_keypress_cond.key_mask & kDown) != cur_opcode.begin_keypress_cond.key_mask) {
/* Keys not pressed. Skip conditional block. */
this->SkipConditionalBlock();
}
break;
}
}
}

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@ -0,0 +1,157 @@
/*
* Copyright (c) 2018 Atmosphère-NX
*
* This program is free software; you can redistribute it and/or modify it
* under the terms and conditions of the GNU General Public License,
* version 2, as published by the Free Software Foundation.
*
* This program is distributed in the hope it will be useful, but WITHOUT
* ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
* FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License for
* more details.
*
* You should have received a copy of the GNU General Public License
* along with this program. If not, see <http://www.gnu.org/licenses/>.
*/
#pragma once
#include <switch.h>
#include <stratosphere.hpp>
#include "dmnt_cheat_types.hpp"
enum CheatVmOpcodeType : u32 {
CheatVmOpcodeType_StoreStatic = 0,
CheatVmOpcodeType_BeginConditionalBlock = 1,
CheatVmOpcodeType_EndConditionalBlock = 2,
CheatVmOpcodeType_ControlLoop = 3,
CheatVmOpcodeType_LoadRegisterStatic = 4,
CheatVmOpcodeType_LoadRegisterMemory = 5,
CheatVmOpcodeType_StoreToRegisterAddress = 6,
CheatVmOpcodeType_PerformArithmetic = 7,
CheatVmOpcodeType_BeginKeypressConditionalBlock = 8,
};
enum MemoryAccessType : u32 {
MemoryAccessType_MainNso = 0,
MemoryAccessType_Heap = 1,
};
enum ConditionalComparisonType : u32 {
ConditionalComparisonType_GT = 1,
ConditionalComparisonType_GE = 2,
ConditionalComparisonType_LT = 3,
ConditionalComparisonType_LE = 4,
ConditionalComparisonType_EQ = 5,
ConditionalComparisonType_NE = 6,
};
enum RegisterArithmeticType : u32 {
RegisterArithmeticType_Addition = 0,
RegisterArithmeticType_Subtraction = 1,
RegisterArithmeticType_Multiplication = 2,
RegisterArithmeticType_LeftShift = 3,
RegisterArithmeticType_RightShift = 4,
};
union VmInt {
u8 bit8;
u16 bit16;
u32 bit32;
u64 bit64;
};
struct StoreStaticOpcode {
u32 bit_width;
MemoryAccessType mem_type;
u32 offset_register;
u64 relative_address;
VmInt value;
};
struct BeginConditionalOpcode {
u32 bit_width;
MemoryAccessType mem_type;
ConditionalComparisonType cond_type;
u64 relative_address;
VmInt value;
};
struct EndConditionalOpcode {};
struct ControlLoopOpcode {
bool start_loop;
u32 register_index;
u32 num_iters;
};
struct LoadRegisterStaticOpcode {
u32 register_index;
u64 value;
};
struct LoadRegisterMemoryOpcode {
u32 bit_width;
MemoryAccessType mem_type;
u32 reg_index;
bool load_from_reg;
u64 relative_address;
};
struct StoreToRegisterAddressOpcode {
u32 bit_width;
u32 reg_index;
bool increment_reg;
bool add_offset_reg;
u32 offset_reg_index;
u64 value;
};
struct PerformArithmeticOpcode {
u32 bit_width;
u32 reg_index;
RegisterArithmeticType math_type;
VmInt value;
};
struct BeginKeypressConditionalOpcode {
u32 key_mask;
};
struct CheatVmOpcode {
CheatVmOpcodeType opcode;
union {
StoreStaticOpcode store_static;
BeginConditionalOpcode begin_cond;
EndConditionalOpcode end_cond;
ControlLoopOpcode ctrl_loop;
LoadRegisterStaticOpcode ldr_static;
LoadRegisterMemoryOpcode ldr_memory;
StoreToRegisterAddressOpcode str_regaddr;
PerformArithmeticOpcode perform_math;
BeginKeypressConditionalOpcode begin_keypress_cond;
};
};
class DmntCheatVm {
public:
constexpr static size_t MaximumProgramOpcodeCount = 0x400;
constexpr static size_t NumRegisters = 0x10;
private:
size_t num_opcodes = 0;
size_t instruction_ptr = 0;
u32 program[MaximumProgramOpcodeCount] = {0};
u64 registers[NumRegisters] = {0};
size_t loop_tops[NumRegisters] = {0};
private:
bool DecodeNextOpcode(CheatVmOpcode *out);
void SkipConditionalBlock();
public:
DmntCheatVm() { }
size_t GetProgramSize() {
return this->num_opcodes;
}
void Execute(const CheatProcessMetadata *metadata);
};