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Atmosphere/stratosphere/dmnt/source/cheat/impl/dmnt_cheat_api.cpp

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/*
* Copyright (c) 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 <stratosphere.hpp>
#include "dmnt_cheat_api.hpp"
#include "dmnt_cheat_vm.hpp"
#include "dmnt_cheat_debug_events_manager.hpp"
namespace ams::dmnt::cheat::impl {
namespace {
/* Helper definitions. */
constexpr size_t MaxCheatCount = 0x80;
constexpr size_t MaxFrozenAddressCount = 0x80;
class FrozenAddressMapEntry : public util::IntrusiveRedBlackTreeBaseNode<FrozenAddressMapEntry> {
public:
using RedBlackKeyType = u64;
private:
u64 m_address;
FrozenAddressValue m_value;
public:
FrozenAddressMapEntry(u64 address, FrozenAddressValue value) : m_address(address), m_value(value) { /* ... */ }
constexpr u64 GetAddress() const { return m_address; }
constexpr const FrozenAddressValue &GetValue() const { return m_value; }
constexpr FrozenAddressValue &GetValue() { return m_value; }
static constexpr ALWAYS_INLINE int Compare(const RedBlackKeyType &lval, const FrozenAddressMapEntry &rhs) {
const auto rval = rhs.GetAddress();
if (lval < rval) {
return -1;
} else if (lval == rval) {
return 0;
} else {
return 1;
}
}
static constexpr ALWAYS_INLINE int Compare(const FrozenAddressMapEntry &lhs, const FrozenAddressMapEntry &rhs) {
return Compare(lhs.GetAddress(), rhs);
}
};
constinit os::SdkMutex g_text_file_buffer_lock;
constinit char g_text_file_buffer[64_KB];
constinit u8 g_frozen_address_map_memory[sizeof(FrozenAddressMapEntry) * MaxFrozenAddressCount];
constinit lmem::HeapHandle g_frozen_address_map_heap;
FrozenAddressMapEntry *AllocateFrozenAddress(u64 address, FrozenAddressValue value) {
FrozenAddressMapEntry *entry = static_cast<FrozenAddressMapEntry *>(lmem::AllocateFromUnitHeap(g_frozen_address_map_heap));
if (entry != nullptr) {
std::construct_at(entry, address, value);
}
return entry;
}
void DeallocateFrozenAddress(FrozenAddressMapEntry *entry) {
std::destroy_at(entry);
lmem::FreeToUnitHeap(g_frozen_address_map_heap, entry);
}
using FrozenAddressMap = typename util::IntrusiveRedBlackTreeBaseTraits<FrozenAddressMapEntry>::TreeType<FrozenAddressMapEntry>;
/* Manager class. */
class CheatProcessManager {
private:
static constexpr size_t ThreadStackSize = 0x4000;
private:
os::SdkMutex m_cheat_lock;
os::Event m_unsafe_break_event;
os::Event m_debug_events_event; /* Autoclear. */
os::ThreadType m_detect_thread, m_debug_events_thread;
os::SystemEvent m_cheat_process_event;
os::NativeHandle m_cheat_process_debug_handle = os::InvalidNativeHandle;
CheatProcessMetadata m_cheat_process_metadata = {};
os::ThreadType m_vm_thread;
bool m_broken_unsafe = false;
bool m_needs_reload_vm = false;
CheatVirtualMachine m_cheat_vm;
bool m_enable_cheats_by_default = true;
bool m_always_save_cheat_toggles = false;
bool m_should_save_cheat_toggles = false;
CheatEntry m_cheat_entries[MaxCheatCount] = {};
FrozenAddressMap m_frozen_addresses_map = {};
alignas(os::MemoryPageSize) u8 m_detect_thread_stack[ThreadStackSize] = {};
alignas(os::MemoryPageSize) u8 m_debug_events_thread_stack[ThreadStackSize] = {};
alignas(os::MemoryPageSize) u8 m_vm_thread_stack[ThreadStackSize] = {};
private:
static void DetectLaunchThread(void *_this);
static void VirtualMachineThread(void *_this);
static void DebugEventsThread(void *_this);
Result AttachToApplicationProcess(bool on_process_launch);
bool ParseCheats(const char *s, size_t len);
bool LoadCheats(const ncm::ProgramId program_id, const u8 *module_id);
bool ParseCheatToggles(const char *s, size_t len);
bool LoadCheatToggles(const ncm::ProgramId program_id);
void SaveCheatToggles(const ncm::ProgramId program_id);
bool GetNeedsReloadVm() const {
return m_needs_reload_vm;
}
void SetNeedsReloadVm(bool reload) {
m_needs_reload_vm = reload;
}
void ResetCheatEntry(size_t i) {
if (i < MaxCheatCount) {
std::memset(m_cheat_entries + i, 0, sizeof(m_cheat_entries[i]));
m_cheat_entries[i].cheat_id = i;
this->SetNeedsReloadVm(true);
}
}
void ResetAllCheatEntries() {
for (size_t i = 0; i < MaxCheatCount; i++) {
this->ResetCheatEntry(i);
}
m_cheat_vm.ResetStaticRegisters();
}
CheatEntry *GetCheatEntryById(size_t i) {
if (i < MaxCheatCount) {
return m_cheat_entries + i;
}
return nullptr;
}
CheatEntry *GetCheatEntryByReadableName(const char *readable_name) {
/* Check all non-master cheats for match. */
for (size_t i = 1; i < MaxCheatCount; i++) {
if (std::strncmp(m_cheat_entries[i].definition.readable_name, readable_name, sizeof(m_cheat_entries[i].definition.readable_name)) == 0) {
return m_cheat_entries + i;
}
}
return nullptr;
}
CheatEntry *GetFreeCheatEntry() {
/* Check all non-master cheats for availability. */
for (size_t i = 1; i < MaxCheatCount; i++) {
if (m_cheat_entries[i].definition.num_opcodes == 0) {
return m_cheat_entries + i;
}
}
return nullptr;
}
void CloseActiveCheatProcess() {
if (m_cheat_process_debug_handle != os::InvalidNativeHandle) {
/* We don't need to do any unsafe brekaing. */
m_broken_unsafe = false;
m_unsafe_break_event.Signal();
/* Knock out the debug events thread. */
{
std::scoped_lock lk(util::GetReference(m_debug_events_thread.cs_thread));
R_ABORT_UNLESS(svc::CancelSynchronization(m_debug_events_thread.thread_impl->handle));
}
/* Close resources. */
R_ABORT_UNLESS(svc::CloseHandle(m_cheat_process_debug_handle));
m_cheat_process_debug_handle = os::InvalidNativeHandle;
/* Save cheat toggles. */
if (m_always_save_cheat_toggles || m_should_save_cheat_toggles) {
this->SaveCheatToggles(m_cheat_process_metadata.program_id);
m_should_save_cheat_toggles = false;
}
/* Clear metadata. */
static_assert(util::is_pod<decltype(m_cheat_process_metadata)>::value, "CheatProcessMetadata definition!");
std::memset(std::addressof(m_cheat_process_metadata), 0, sizeof(m_cheat_process_metadata));
/* Clear cheat list. */
this->ResetAllCheatEntries();
/* Clear frozen addresses. */
{
auto it = m_frozen_addresses_map.begin();
while (it != m_frozen_addresses_map.end()) {
FrozenAddressMapEntry *entry = std::addressof(*it);
it = m_frozen_addresses_map.erase(it);
DeallocateFrozenAddress(entry);
}
}
/* Signal to our fans. */
m_cheat_process_event.Signal();
}
}
bool HasActiveCheatProcess() {
/* Note: This function *MUST* be called only with the cheat lock held. */
os::ProcessId pid;
bool has_cheat_process = m_cheat_process_debug_handle != os::InvalidNativeHandle;
has_cheat_process &= R_SUCCEEDED(os::GetProcessId(std::addressof(pid), m_cheat_process_debug_handle));
has_cheat_process &= R_SUCCEEDED(pm::dmnt::GetApplicationProcessId(std::addressof(pid)));
has_cheat_process &= (pid == m_cheat_process_metadata.process_id);
if (!has_cheat_process) {
this->CloseActiveCheatProcess();
}
return has_cheat_process;
}
Result EnsureCheatProcess() {
R_UNLESS(this->HasActiveCheatProcess(), dmnt::cheat::ResultCheatNotAttached());
return ResultSuccess();
}
os::NativeHandle GetCheatProcessHandle() const {
return m_cheat_process_debug_handle;
}
os::NativeHandle HookToCreateApplicationProcess() const {
os::NativeHandle h;
R_ABORT_UNLESS(pm::dmnt::HookToCreateApplicationProcess(std::addressof(h)));
return h;
}
void StartProcess(os::ProcessId process_id) const {
R_ABORT_UNLESS(pm::dmnt::StartProcess(process_id));
}
public:
CheatProcessManager() : m_cheat_lock(), m_unsafe_break_event(os::EventClearMode_ManualClear), m_debug_events_event(os::EventClearMode_AutoClear), m_cheat_process_event(os::EventClearMode_AutoClear, true) {
/* Learn whether we should enable cheats by default. */
{
u8 en = 0;
if (settings::fwdbg::GetSettingsItemValue(std::addressof(en), sizeof(en), "atmosphere", "dmnt_cheats_enabled_by_default") == sizeof(en)) {
m_enable_cheats_by_default = (en != 0);
}
en = 0;
if (settings::fwdbg::GetSettingsItemValue( std::addressof(en), sizeof(en), "atmosphere", "dmnt_always_save_cheat_toggles") == sizeof(en)) {
m_always_save_cheat_toggles = (en != 0);
}
}
/* Spawn application detection thread, spawn cheat vm thread. */
R_ABORT_UNLESS(os::CreateThread(std::addressof(m_detect_thread), DetectLaunchThread, this, m_detect_thread_stack, ThreadStackSize, AMS_GET_SYSTEM_THREAD_PRIORITY(dmnt, CheatDetect)));
os::SetThreadNamePointer(std::addressof(m_detect_thread), AMS_GET_SYSTEM_THREAD_NAME(dmnt, CheatDetect));
R_ABORT_UNLESS(os::CreateThread(std::addressof(m_vm_thread), VirtualMachineThread, this, m_vm_thread_stack, ThreadStackSize, AMS_GET_SYSTEM_THREAD_PRIORITY(dmnt, CheatVirtualMachine)));
os::SetThreadNamePointer(std::addressof(m_vm_thread), AMS_GET_SYSTEM_THREAD_NAME(dmnt, CheatVirtualMachine));
R_ABORT_UNLESS(os::CreateThread(std::addressof(m_debug_events_thread), DebugEventsThread, this, m_debug_events_thread_stack, ThreadStackSize, AMS_GET_SYSTEM_THREAD_PRIORITY(dmnt, CheatDebugEvents)));
os::SetThreadNamePointer(std::addressof(m_debug_events_thread), AMS_GET_SYSTEM_THREAD_NAME(dmnt, CheatDebugEvents));
/* Start threads. */
os::StartThread(std::addressof(m_detect_thread));
os::StartThread(std::addressof(m_vm_thread));
os::StartThread(std::addressof(m_debug_events_thread));
}
bool GetHasActiveCheatProcess() {
std::scoped_lock lk(m_cheat_lock);
return this->HasActiveCheatProcess();
}
os::NativeHandle GetCheatProcessEventHandle() const {
return m_cheat_process_event.GetReadableHandle();
}
Result GetCheatProcessMetadata(CheatProcessMetadata *out) {
std::scoped_lock lk(m_cheat_lock);
R_TRY(this->EnsureCheatProcess());
std::memcpy(out, std::addressof(m_cheat_process_metadata), sizeof(*out));
return ResultSuccess();
}
Result ForceOpenCheatProcess() {
return this->AttachToApplicationProcess(false);
}
Result ForceCloseCheatProcess() {
this->CloseActiveCheatProcess();
return ResultSuccess();
}
Result ReadCheatProcessMemoryUnsafe(u64 proc_addr, void *out_data, size_t size) {
return svc::ReadDebugProcessMemory(reinterpret_cast<uintptr_t>(out_data), this->GetCheatProcessHandle(), proc_addr, size);
}
Result WriteCheatProcessMemoryUnsafe(u64 proc_addr, const void *data, size_t size) {
R_TRY(svc::WriteDebugProcessMemory(this->GetCheatProcessHandle(), reinterpret_cast<uintptr_t>(data), proc_addr, size));
for (auto &entry : m_frozen_addresses_map) {
/* Get address/value. */
const u64 address = entry.GetAddress();
auto &value = entry.GetValue();
/* Map is ordered, so break when we can. */
if (address >= proc_addr + size) {
break;
}
/* Check if we need to write. */
if (proc_addr <= address && address < proc_addr + size) {
const size_t offset = (address - proc_addr);
const size_t copy_size = std::min(sizeof(value.value), size - offset);
std::memcpy(std::addressof(value.value), reinterpret_cast<void *>(reinterpret_cast<uintptr_t>(data) + offset), copy_size);
}
}
return ResultSuccess();
}
Result PauseCheatProcessUnsafe() {
m_broken_unsafe = true;
m_unsafe_break_event.Clear();
return svc::BreakDebugProcess(this->GetCheatProcessHandle());
}
Result ResumeCheatProcessUnsafe() {
m_broken_unsafe = false;
m_unsafe_break_event.Signal();
dmnt::cheat::impl::ContinueCheatProcess(this->GetCheatProcessHandle());
return ResultSuccess();
}
Result GetCheatProcessMappingCount(u64 *out_count) {
std::scoped_lock lk(m_cheat_lock);
R_TRY(this->EnsureCheatProcess());
svc::MemoryInfo mem_info;
svc::PageInfo page_info;
u64 address = 0, count = 0;
do {
if (R_FAILED(svc::QueryDebugProcessMemory(std::addressof(mem_info), std::addressof(page_info), this->GetCheatProcessHandle(), address))) {
break;
}
if (mem_info.permission != svc::MemoryPermission_None) {
count++;
}
address = mem_info.base_address + mem_info.size;
} while (address != 0);
*out_count = count;
return ResultSuccess();
}
Result GetCheatProcessMappings(svc::MemoryInfo *mappings, size_t max_count, u64 *out_count, u64 offset) {
std::scoped_lock lk(m_cheat_lock);
R_TRY(this->EnsureCheatProcess());
svc::MemoryInfo mem_info;
svc::PageInfo page_info;
u64 address = 0, total_count = 0, written_count = 0;
do {
if (R_FAILED(svc::QueryDebugProcessMemory(std::addressof(mem_info), std::addressof(page_info), this->GetCheatProcessHandle(), address))) {
break;
}
if (mem_info.permission != svc::MemoryPermission_None) {
if (offset <= total_count && written_count < max_count) {
mappings[written_count++] = mem_info;
}
total_count++;
}
address = mem_info.base_address + mem_info.size;
} while (address != 0 && written_count < max_count);
*out_count = written_count;
return ResultSuccess();
}
Result ReadCheatProcessMemory(u64 proc_addr, void *out_data, size_t size) {
std::scoped_lock lk(m_cheat_lock);
R_TRY(this->EnsureCheatProcess());
return this->ReadCheatProcessMemoryUnsafe(proc_addr, out_data, size);
}
Result WriteCheatProcessMemory(u64 proc_addr, const void *data, size_t size) {
std::scoped_lock lk(m_cheat_lock);
R_TRY(this->EnsureCheatProcess());
return this->WriteCheatProcessMemoryUnsafe(proc_addr, data, size);
}
Result QueryCheatProcessMemory(svc::MemoryInfo *mapping, u64 address) {
std::scoped_lock lk(m_cheat_lock);
R_TRY(this->EnsureCheatProcess());
svc::PageInfo page_info;
return svc::QueryDebugProcessMemory(mapping, std::addressof(page_info), this->GetCheatProcessHandle(), address);
}
Result PauseCheatProcess() {
std::scoped_lock lk(m_cheat_lock);
R_TRY(this->EnsureCheatProcess());
return this->PauseCheatProcessUnsafe();
}
Result ResumeCheatProcess() {
std::scoped_lock lk(m_cheat_lock);
R_TRY(this->EnsureCheatProcess());
return this->ResumeCheatProcessUnsafe();
}
Result GetCheatCount(u64 *out_count) {
std::scoped_lock lk(m_cheat_lock);
R_TRY(this->EnsureCheatProcess());
size_t count = 0;
for (size_t i = 0; i < MaxCheatCount; i++) {
if (m_cheat_entries[i].definition.num_opcodes) {
count++;
}
}
*out_count = count;
return ResultSuccess();
}
Result GetCheats(CheatEntry *out_cheats, size_t max_count, u64 *out_count, u64 offset) {
std::scoped_lock lk(m_cheat_lock);
R_TRY(this->EnsureCheatProcess());
size_t count = 0, total_count = 0;
for (size_t i = 0; i < MaxCheatCount && count < max_count; i++) {
if (m_cheat_entries[i].definition.num_opcodes) {
total_count++;
if (total_count > offset) {
out_cheats[count++] = m_cheat_entries[i];
}
}
}
*out_count = count;
return ResultSuccess();
}
Result GetCheatById(CheatEntry *out_cheat, u32 cheat_id) {
std::scoped_lock lk(m_cheat_lock);
R_TRY(this->EnsureCheatProcess());
const CheatEntry *entry = this->GetCheatEntryById(cheat_id);
R_UNLESS(entry != nullptr, dmnt::cheat::ResultCheatUnknownId());
R_UNLESS(entry->definition.num_opcodes != 0, dmnt::cheat::ResultCheatUnknownId());
*out_cheat = *entry;
return ResultSuccess();
}
Result ToggleCheat(u32 cheat_id) {
std::scoped_lock lk(m_cheat_lock);
R_TRY(this->EnsureCheatProcess());
CheatEntry *entry = this->GetCheatEntryById(cheat_id);
R_UNLESS(entry != nullptr, dmnt::cheat::ResultCheatUnknownId());
R_UNLESS(entry->definition.num_opcodes != 0, dmnt::cheat::ResultCheatUnknownId());
R_UNLESS(cheat_id != 0, dmnt::cheat::ResultCheatCannotDisable());
entry->enabled = !entry->enabled;
/* Trigger a VM reload. */
this->SetNeedsReloadVm(true);
return ResultSuccess();
}
Result AddCheat(u32 *out_id, const CheatDefinition &def, bool enabled) {
std::scoped_lock lk(m_cheat_lock);
R_TRY(this->EnsureCheatProcess());
R_UNLESS(def.num_opcodes != 0, dmnt::cheat::ResultCheatInvalid());
R_UNLESS(def.num_opcodes <= util::size(def.opcodes), dmnt::cheat::ResultCheatInvalid());
CheatEntry *new_entry = this->GetFreeCheatEntry();
R_UNLESS(new_entry != nullptr, dmnt::cheat::ResultCheatOutOfResource());
new_entry->enabled = enabled;
new_entry->definition = def;
/* Trigger a VM reload. */
this->SetNeedsReloadVm(true);
/* Set output id. */
*out_id = new_entry->cheat_id;
return ResultSuccess();
}
Result RemoveCheat(u32 cheat_id) {
std::scoped_lock lk(m_cheat_lock);
R_TRY(this->EnsureCheatProcess());
R_UNLESS(cheat_id < MaxCheatCount, dmnt::cheat::ResultCheatUnknownId());
this->ResetCheatEntry(cheat_id);
/* Trigger a VM reload. */
this->SetNeedsReloadVm(true);
return ResultSuccess();
}
Result SetMasterCheat(const CheatDefinition &def) {
std::scoped_lock lk(m_cheat_lock);
R_TRY(this->EnsureCheatProcess());
R_UNLESS(def.num_opcodes != 0, dmnt::cheat::ResultCheatInvalid());
R_UNLESS(def.num_opcodes <= util::size(def.opcodes), dmnt::cheat::ResultCheatInvalid());
CheatEntry *master_entry = m_cheat_entries + 0;
master_entry->enabled = true;
master_entry->definition = def;
/* Trigger a VM reload. */
this->SetNeedsReloadVm(true);
return ResultSuccess();
}
Result ReadStaticRegister(u64 *out, size_t which) {
std::scoped_lock lk(m_cheat_lock);
R_TRY(this->EnsureCheatProcess());
R_UNLESS(which < CheatVirtualMachine::NumStaticRegisters, dmnt::cheat::ResultCheatInvalid());
*out = m_cheat_vm.GetStaticRegister(which);
return ResultSuccess();
}
Result WriteStaticRegister(size_t which, u64 value) {
std::scoped_lock lk(m_cheat_lock);
R_TRY(this->EnsureCheatProcess());
R_UNLESS(which < CheatVirtualMachine::NumStaticRegisters, dmnt::cheat::ResultCheatInvalid());
m_cheat_vm.SetStaticRegister(which, value);
return ResultSuccess();
}
Result ResetStaticRegisters() {
std::scoped_lock lk(m_cheat_lock);
R_TRY(this->EnsureCheatProcess());
m_cheat_vm.ResetStaticRegisters();
return ResultSuccess();
}
Result GetFrozenAddressCount(u64 *out_count) {
std::scoped_lock lk(m_cheat_lock);
R_TRY(this->EnsureCheatProcess());
*out_count = std::distance(m_frozen_addresses_map.begin(), m_frozen_addresses_map.end());
return ResultSuccess();
}
Result GetFrozenAddresses(FrozenAddressEntry *frz_addrs, size_t max_count, u64 *out_count, u64 offset) {
std::scoped_lock lk(m_cheat_lock);
R_TRY(this->EnsureCheatProcess());
u64 total_count = 0, written_count = 0;
for (const auto &entry : m_frozen_addresses_map) {
if (written_count >= max_count) {
break;
}
if (offset <= total_count) {
frz_addrs[written_count].address = entry.GetAddress();
frz_addrs[written_count].value = entry.GetValue();
written_count++;
}
total_count++;
}
*out_count = written_count;
return ResultSuccess();
}
Result GetFrozenAddress(FrozenAddressEntry *frz_addr, u64 address) {
std::scoped_lock lk(m_cheat_lock);
R_TRY(this->EnsureCheatProcess());
const auto it = m_frozen_addresses_map.find_key(address);
R_UNLESS(it != m_frozen_addresses_map.end(), dmnt::cheat::ResultFrozenAddressNotFound());
frz_addr->address = it->GetAddress();
frz_addr->value = it->GetValue();
return ResultSuccess();
}
Result EnableFrozenAddress(u64 *out_value, u64 address, u64 width) {
std::scoped_lock lk(m_cheat_lock);
R_TRY(this->EnsureCheatProcess());
const auto it = m_frozen_addresses_map.find_key(address);
R_UNLESS(it == m_frozen_addresses_map.end(), dmnt::cheat::ResultFrozenAddressAlreadyExists());
FrozenAddressValue value = {};
value.width = width;
R_TRY(this->ReadCheatProcessMemoryUnsafe(address, std::addressof(value.value), width));
FrozenAddressMapEntry *entry = AllocateFrozenAddress(address, value);
R_UNLESS(entry != nullptr, dmnt::cheat::ResultFrozenAddressOutOfResource());
m_frozen_addresses_map.insert(*entry);
*out_value = value.value;
return ResultSuccess();
}
Result DisableFrozenAddress(u64 address) {
std::scoped_lock lk(m_cheat_lock);
R_TRY(this->EnsureCheatProcess());
const auto it = m_frozen_addresses_map.find_key(address);
R_UNLESS(it != m_frozen_addresses_map.end(), dmnt::cheat::ResultFrozenAddressNotFound());
FrozenAddressMapEntry *entry = std::addressof(*it);
m_frozen_addresses_map.erase(it);
DeallocateFrozenAddress(entry);
return ResultSuccess();
}
};
void CheatProcessManager::DetectLaunchThread(void *_this) {
CheatProcessManager *manager = reinterpret_cast<CheatProcessManager *>(_this);
Event hook;
while (true) {
eventLoadRemote(std::addressof(hook), manager->HookToCreateApplicationProcess(), true);
if (R_SUCCEEDED(eventWait(std::addressof(hook), std::numeric_limits<u64>::max()))) {
manager->AttachToApplicationProcess(true);
}
eventClose(std::addressof(hook));
}
}
void CheatProcessManager::DebugEventsThread(void *_this) {
CheatProcessManager *manager = reinterpret_cast<CheatProcessManager *>(_this);
while (true) {
/* Atomically wait (and clear) signal for new process. */
manager->m_debug_events_event.Wait();
while (true) {
os::NativeHandle cheat_process_handle = manager->GetCheatProcessHandle();
s32 dummy;
while (cheat_process_handle != os::InvalidNativeHandle && R_SUCCEEDED(svc::WaitSynchronization(std::addressof(dummy), std::addressof(cheat_process_handle), 1, std::numeric_limits<u64>::max()))) {
manager->m_cheat_lock.Lock();
ON_SCOPE_EXIT { manager->m_cheat_lock.Unlock(); };
{
ON_SCOPE_EXIT { cheat_process_handle = manager->GetCheatProcessHandle(); };
/* If we did an unsafe break, wait until we're not broken. */
if (manager->m_broken_unsafe) {
manager->m_cheat_lock.Unlock();
manager->m_unsafe_break_event.Wait();
manager->m_cheat_lock.Lock();
if (manager->GetCheatProcessHandle() != os::InvalidNativeHandle) {
continue;
} else {
break;
}
}
/* Handle any pending debug events. */
if (manager->HasActiveCheatProcess()) {
R_TRY_CATCH(dmnt::cheat::impl::ContinueCheatProcess(manager->GetCheatProcessHandle())) {
R_CATCH(svc::ResultProcessTerminated) {
manager->CloseActiveCheatProcess();
break;
}
} R_END_TRY_CATCH_WITH_ABORT_UNLESS;
}
}
}
/* WaitSynchronization failed. This means someone canceled our synchronization, possibly us. */
/* Let's check if we should quit! */
std::scoped_lock lk(manager->m_cheat_lock);
if (!manager->HasActiveCheatProcess()) {
break;
}
}
}
}
void CheatProcessManager::VirtualMachineThread(void *_this) {
CheatProcessManager *manager = reinterpret_cast<CheatProcessManager *>(_this);
while (true) {
/* Apply cheats. */
{
std::scoped_lock lk(manager->m_cheat_lock);
if (manager->HasActiveCheatProcess()) {
/* Execute VM. */
if (!manager->GetNeedsReloadVm() || manager->m_cheat_vm.LoadProgram(manager->m_cheat_entries, util::size(manager->m_cheat_entries))) {
manager->SetNeedsReloadVm(false);
/* Execute program only if it has opcodes. */
if (manager->m_cheat_vm.GetProgramSize()) {
manager->m_cheat_vm.Execute(std::addressof(manager->m_cheat_process_metadata));
}
}
/* Apply frozen addresses. */
for (const auto &entry : manager->m_frozen_addresses_map) {
const auto address = entry.GetAddress();
const auto &value = entry.GetValue();
/* Use Write SVC directly, to avoid the usual frozen address update logic. */
svc::WriteDebugProcessMemory(manager->GetCheatProcessHandle(), reinterpret_cast<uintptr_t>(std::addressof(value.value)), address, value.width);
}
}
}
/* Sleep until next potential execution. */
constexpr s64 TimesPerSecond = 12;
constexpr s64 DelayNanoSeconds = TimeSpan::FromSeconds(1).GetNanoSeconds() / TimesPerSecond;
constexpr TimeSpan Delay = TimeSpan::FromNanoSeconds(DelayNanoSeconds);
os::SleepThread(Delay);
}
}
#define R_ABORT_UNLESS_IF_NEW_PROCESS(res) \
if (on_process_launch) { \
R_ABORT_UNLESS(res); \
} else { \
R_TRY(res); \
}
Result CheatProcessManager::AttachToApplicationProcess(bool on_process_launch) {
std::scoped_lock lk(m_cheat_lock);
/* Close the active process, if needed. */
{
if (this->HasActiveCheatProcess()) {
/* When forcing attach, we're done. */
R_SUCCEED_IF(!on_process_launch);
}
/* Detach from the current process, if it's open. */
this->CloseActiveCheatProcess();
}
/* Get the application process's ID. */
R_ABORT_UNLESS_IF_NEW_PROCESS(pm::dmnt::GetApplicationProcessId(std::addressof(m_cheat_process_metadata.process_id)));
auto proc_guard = SCOPE_GUARD {
if (on_process_launch) {
this->StartProcess(m_cheat_process_metadata.process_id);
}
m_cheat_process_metadata.process_id = os::ProcessId{};
};
/* Get process handle, use it to learn memory extents. */
{
os::NativeHandle proc_h = os::InvalidNativeHandle;
ncm::ProgramLocation loc = {};
cfg::OverrideStatus status = {};
R_ABORT_UNLESS_IF_NEW_PROCESS(pm::dmnt::AtmosphereGetProcessInfo(std::addressof(proc_h), std::addressof(loc), std::addressof(status), m_cheat_process_metadata.process_id));
ON_SCOPE_EXIT { os::CloseNativeHandle(proc_h); };
m_cheat_process_metadata.program_id = loc.program_id;
R_ABORT_UNLESS(svc::GetInfo(std::addressof(m_cheat_process_metadata.heap_extents.base), svc::InfoType_HeapRegionAddress, proc_h, 0));
R_ABORT_UNLESS(svc::GetInfo(std::addressof(m_cheat_process_metadata.heap_extents.size), svc::InfoType_HeapRegionSize, proc_h, 0));
R_ABORT_UNLESS(svc::GetInfo(std::addressof(m_cheat_process_metadata.alias_extents.base), svc::InfoType_AliasRegionAddress, proc_h, 0));
R_ABORT_UNLESS(svc::GetInfo(std::addressof(m_cheat_process_metadata.alias_extents.size), svc::InfoType_AliasRegionSize, proc_h, 0));
R_ABORT_UNLESS(svc::GetInfo(std::addressof(m_cheat_process_metadata.aslr_extents.base), svc::InfoType_AslrRegionAddress, proc_h, 0));
R_ABORT_UNLESS(svc::GetInfo(std::addressof(m_cheat_process_metadata.aslr_extents.size), svc::InfoType_AslrRegionSize, proc_h, 0));
/* If new process launch, we may not want to actually attach. */
if (on_process_launch) {
R_UNLESS(status.IsCheatEnabled(), dmnt::cheat::ResultCheatNotAttached());
}
}
/* Get module information from loader. */
{
ldr::ModuleInfo proc_modules[2];
s32 num_modules;
/* TODO: ldr::dmnt:: */
R_ABORT_UNLESS_IF_NEW_PROCESS(ldrDmntGetProcessModuleInfo(static_cast<u64>(m_cheat_process_metadata.process_id), reinterpret_cast<LoaderModuleInfo *>(proc_modules), util::size(proc_modules), std::addressof(num_modules)));
/* All applications must have two modules. */
/* Only accept one (which means we're attaching to HBL) */
/* if we aren't auto-attaching. */
const ldr::ModuleInfo *proc_module = nullptr;
if (num_modules == 2) {
proc_module = std::addressof(proc_modules[1]);
} else if (num_modules == 1 && !on_process_launch) {
proc_module = std::addressof(proc_modules[0]);
} else {
return dmnt::cheat::ResultCheatNotAttached();
}
m_cheat_process_metadata.main_nso_extents.base = proc_module->address;
m_cheat_process_metadata.main_nso_extents.size = proc_module->size;
std::memcpy(m_cheat_process_metadata.main_nso_module_id, proc_module->module_id, sizeof(m_cheat_process_metadata.main_nso_module_id));
}
/* Read cheats off the SD. */
if (!this->LoadCheats(m_cheat_process_metadata.program_id, m_cheat_process_metadata.main_nso_module_id) ||
!this->LoadCheatToggles(m_cheat_process_metadata.program_id)) {
/* If new process launch, require success. */
R_UNLESS(!on_process_launch, dmnt::cheat::ResultCheatNotAttached());
}
/* Open a debug handle. */
svc::Handle debug_handle = svc::InvalidHandle;
R_ABORT_UNLESS_IF_NEW_PROCESS(svc::DebugActiveProcess(std::addressof(debug_handle), m_cheat_process_metadata.process_id.value));
/* Set our debug handle. */
m_cheat_process_debug_handle = debug_handle;
/* Cancel process guard. */
proc_guard.Cancel();
/* Reset broken state. */
m_broken_unsafe = false;
m_unsafe_break_event.Signal();
/* If new process, start the process. */
if (on_process_launch) {
this->StartProcess(m_cheat_process_metadata.process_id);
}
/* Signal to the debug events thread. */
m_debug_events_event.Signal();
/* Signal to our fans. */
m_cheat_process_event.Signal();
return ResultSuccess();
}
#undef R_ABORT_UNLESS_IF_NEW_PROCESS
bool CheatProcessManager::ParseCheats(const char *s, size_t len) {
/* Trigger a VM reload. */
this->SetNeedsReloadVm(true);
/* Parse the input string. */
size_t i = 0;
CheatEntry *cur_entry = nullptr;
while (i < len) {
if (std::isspace(static_cast<unsigned char>(s[i]))) {
/* Just ignore whitespace. */
i++;
} else if (s[i] == '[') {
/* Parse a readable cheat name. */
cur_entry = this->GetFreeCheatEntry();
if (cur_entry == nullptr) {
return false;
}
/* Extract name bounds. */
size_t j = i + 1;
while (s[j] != ']') {
j++;
if (j >= len) {
return false;
}
}
/* s[i+1:j] is cheat name. */
const size_t cheat_name_len = std::min(j - i - 1, sizeof(cur_entry->definition.readable_name));
std::memcpy(cur_entry->definition.readable_name, s + (i + 1), cheat_name_len);
cur_entry->definition.readable_name[cheat_name_len] = 0;
/* Skip onwards. */
i = j + 1;
} else if (s[i] == '{') {
/* We're parsing a master cheat. */
cur_entry = std::addressof(m_cheat_entries[0]);
/* There can only be one master cheat. */
if (cur_entry->definition.num_opcodes > 0) {
return false;
}
/* Extract name bounds */
size_t j = i + 1;
while (s[j] != '}') {
j++;
if (j >= len) {
return false;
}
}
/* s[i+1:j] is cheat name. */
const size_t cheat_name_len = std::min(j - i - 1, sizeof(cur_entry->definition.readable_name));
memcpy(cur_entry->definition.readable_name, s + (i + 1), cheat_name_len);
cur_entry->definition.readable_name[cheat_name_len] = 0;
/* Skip onwards. */
i = j + 1;
} else if (std::isxdigit(static_cast<unsigned char>(s[i]))) {
/* Make sure that we have a cheat open. */
if (cur_entry == nullptr) {
return false;
}
/* Bounds check the opcode count. */
if (cur_entry->definition.num_opcodes >= util::size(cur_entry->definition.opcodes)) {
return false;
}
/* We're parsing an instruction, so validate it's 8 hex digits. */
for (size_t j = 1; j < 8; j++) {
/* Validate 8 hex chars. */
if (i + j >= len || !std::isxdigit(static_cast<unsigned char>(s[i+j]))) {
return false;
}
}
/* Parse the new opcode. */
char hex_str[9] = {0};
std::memcpy(hex_str, s + i, 8);
cur_entry->definition.opcodes[cur_entry->definition.num_opcodes++] = std::strtoul(hex_str, NULL, 16);
/* Skip onwards. */
i += 8;
} else {
/* Unexpected character encountered. */
return false;
}
}
/* Master cheat can't be disabled. */
if (m_cheat_entries[0].definition.num_opcodes > 0) {
m_cheat_entries[0].enabled = true;
}
/* Enable all entries we parsed. */
for (size_t i = 1; i < MaxCheatCount; i++) {
if (m_cheat_entries[i].definition.num_opcodes > 0) {
m_cheat_entries[i].enabled = m_enable_cheats_by_default;
}
}
return true;
}
bool CheatProcessManager::ParseCheatToggles(const char *s, size_t len) {
size_t i = 0;
char cur_cheat_name[sizeof(CheatEntry::definition.readable_name)];
char toggle[8];
while (i < len) {
if (std::isspace(static_cast<unsigned char>(s[i]))) {
/* Just ignore whitespace. */
i++;
} else if (s[i] == '[') {
/* Extract name bounds. */
size_t j = i + 1;
while (s[j] != ']') {
j++;
if (j >= len) {
return false;
}
}
/* s[i+1:j] is cheat name. */
const size_t cheat_name_len = std::min(j - i - 1, sizeof(cur_cheat_name));
std::memcpy(cur_cheat_name, s + (i + 1), cheat_name_len);
cur_cheat_name[cheat_name_len] = 0;
/* Skip onwards. */
i = j + 1;
/* Skip whitespace. */
while (std::isspace(static_cast<unsigned char>(s[i]))) {
i++;
}
/* Parse whether to toggle. */
j = i + 1;
while (!std::isspace(static_cast<unsigned char>(s[j]))) {
j++;
if (j >= len || (j - i) >= sizeof(toggle)) {
return false;
}
}
/* s[i:j] is toggle. */
const size_t toggle_len = (j - i);
std::memcpy(toggle, s + i, toggle_len);
toggle[toggle_len] = 0;
/* Allow specifying toggle for not present cheat. */
CheatEntry *entry = this->GetCheatEntryByReadableName(cur_cheat_name);
if (entry != nullptr) {
if (strcasecmp(toggle, "1") == 0 || strcasecmp(toggle, "true") == 0 || strcasecmp(toggle, "on") == 0) {
entry->enabled = true;
} else if (strcasecmp(toggle, "0") == 0 || strcasecmp(toggle, "false") == 0 || strcasecmp(toggle, "off") == 0) {
entry->enabled = false;
}
}
/* Skip onwards. */
i = j + 1;
} else {
/* Unexpected character encountered. */
return false;
}
}
return true;
}
bool CheatProcessManager::LoadCheats(const ncm::ProgramId program_id, const u8 *module_id) {
/* Reset existing entries. */
this->ResetAllCheatEntries();
/* Open the file for program/module_id. */
fs::FileHandle file;
{
char path[fs::EntryNameLengthMax + 1];
util::SNPrintf(path, sizeof(path), "sdmc:/atmosphere/contents/%016lx/cheats/%02x%02x%02x%02x%02x%02x%02x%02x.txt", program_id.value,
module_id[0], module_id[1], module_id[2], module_id[3], module_id[4], module_id[5], module_id[6], module_id[7]);
if (R_FAILED(fs::OpenFile(std::addressof(file), path, fs::OpenMode_Read))) {
return false;
}
}
ON_SCOPE_EXIT { fs::CloseFile(file); };
/* Get file size. */
s64 file_size;
if (R_FAILED(fs::GetFileSize(std::addressof(file_size), file))) {
return false;
}
if (file_size < 0 || file_size >= static_cast<s64>(sizeof(g_text_file_buffer))) {
return false;
}
std::scoped_lock lk(g_text_file_buffer_lock);
/* Read cheats into buffer. */
if (R_FAILED(fs::ReadFile(file, 0, g_text_file_buffer, file_size))) {
return false;
}
g_text_file_buffer[file_size] = '\x00';
/* Parse cheat buffer. */
return this->ParseCheats(g_text_file_buffer, std::strlen(g_text_file_buffer));
}
bool CheatProcessManager::LoadCheatToggles(const ncm::ProgramId program_id) {
/* Unless we successfully parse, don't save toggles on close. */
m_should_save_cheat_toggles = false;
/* Open the file for program_id. */
fs::FileHandle file;
{
char path[fs::EntryNameLengthMax + 1];
util::SNPrintf(path, sizeof(path), "sdmc:/atmosphere/contents/%016lx/cheats/toggles.txt", program_id.value);
if (R_FAILED(fs::OpenFile(std::addressof(file), path, fs::OpenMode_Read))) {
/* No file presence is allowed. */
return true;
}
}
ON_SCOPE_EXIT { fs::CloseFile(file); };
/* Get file size. */
s64 file_size;
if (R_FAILED(fs::GetFileSize(std::addressof(file_size), file))) {
return false;
}
if (file_size < 0 || file_size >= static_cast<s64>(sizeof(g_text_file_buffer))) {
return false;
}
std::scoped_lock lk(g_text_file_buffer_lock);
/* Read cheats into buffer. */
if (R_FAILED(fs::ReadFile(file, 0, g_text_file_buffer, file_size))) {
return false;
}
g_text_file_buffer[file_size] = '\x00';
/* Parse toggle buffer. */
m_should_save_cheat_toggles = this->ParseCheatToggles(g_text_file_buffer, std::strlen(g_text_file_buffer));
return m_should_save_cheat_toggles;
}
void CheatProcessManager::SaveCheatToggles(const ncm::ProgramId program_id) {
/* Open the file for program_id. */
fs::FileHandle file;
{
char path[fs::EntryNameLengthMax + 1];
util::SNPrintf(path, sizeof(path), "sdmc:/atmosphere/contents/%016lx/cheats/toggles.txt", program_id.value);
fs::DeleteFile(path);
fs::CreateFile(path, 0);
if (R_FAILED(fs::OpenFile(std::addressof(file), path, fs::OpenMode_Write | fs::OpenMode_AllowAppend))) {
return;
}
}
ON_SCOPE_EXIT { fs::CloseFile(file); };
s64 offset = 0;
char buf[0x100];
/* Save all non-master cheats. */
for (size_t i = 1; i < MaxCheatCount; i++) {
if (m_cheat_entries[i].definition.num_opcodes != 0) {
util::SNPrintf(buf, sizeof(buf), "[%s]\n", m_cheat_entries[i].definition.readable_name);
const size_t name_len = std::strlen(buf);
if (R_SUCCEEDED(fs::WriteFile(file, offset, buf, name_len, fs::WriteOption::Flush))) {
offset += name_len;
}
const char *entry = m_cheat_entries[i].enabled ? "true\n" : "false\n";
const size_t entry_len = std::strlen(entry);
if (R_SUCCEEDED(fs::WriteFile(file, offset, entry, entry_len, fs::WriteOption::Flush))) {
offset += entry_len;
}
}
}
}
/* Manager global. */
util::TypedStorage<CheatProcessManager> g_cheat_process_manager;
}
void InitializeCheatManager() {
/* Initialize the debug events manager (spawning its threads). */
InitializeDebugEventsManager();
/* Initialize the frozen address map heap. */
g_frozen_address_map_heap = lmem::CreateUnitHeap(g_frozen_address_map_memory, sizeof(g_frozen_address_map_memory), sizeof(FrozenAddressMapEntry), lmem::CreateOption_ThreadSafe);
/* Create the cheat process manager (spawning its threads). */
util::ConstructAt(g_cheat_process_manager);
}
bool GetHasActiveCheatProcess() {
return GetReference(g_cheat_process_manager).GetHasActiveCheatProcess();
}
os::NativeHandle GetCheatProcessEventHandle() {
return GetReference(g_cheat_process_manager).GetCheatProcessEventHandle();
}
Result GetCheatProcessMetadata(CheatProcessMetadata *out) {
return GetReference(g_cheat_process_manager).GetCheatProcessMetadata(out);
}
Result ForceOpenCheatProcess() {
return GetReference(g_cheat_process_manager).ForceOpenCheatProcess();
}
Result PauseCheatProcess() {
return GetReference(g_cheat_process_manager).PauseCheatProcess();
}
Result ResumeCheatProcess() {
return GetReference(g_cheat_process_manager).ResumeCheatProcess();
}
Result ForceCloseCheatProcess() {
return GetReference(g_cheat_process_manager).ForceCloseCheatProcess();
}
Result ReadCheatProcessMemoryUnsafe(u64 process_addr, void *out_data, size_t size) {
return GetReference(g_cheat_process_manager).ReadCheatProcessMemoryUnsafe(process_addr, out_data, size);
}
Result WriteCheatProcessMemoryUnsafe(u64 process_addr, void *data, size_t size) {
return GetReference(g_cheat_process_manager).WriteCheatProcessMemoryUnsafe(process_addr, data, size);
}
Result PauseCheatProcessUnsafe() {
return GetReference(g_cheat_process_manager).PauseCheatProcessUnsafe();
}
Result ResumeCheatProcessUnsafe() {
return GetReference(g_cheat_process_manager).ResumeCheatProcessUnsafe();
}
Result GetCheatProcessMappingCount(u64 *out_count) {
return GetReference(g_cheat_process_manager).GetCheatProcessMappingCount(out_count);
}
Result GetCheatProcessMappings(svc::MemoryInfo *mappings, size_t max_count, u64 *out_count, u64 offset) {
return GetReference(g_cheat_process_manager).GetCheatProcessMappings(mappings, max_count, out_count, offset);
}
Result ReadCheatProcessMemory(u64 proc_addr, void *out_data, size_t size) {
return GetReference(g_cheat_process_manager).ReadCheatProcessMemory(proc_addr, out_data, size);
}
Result WriteCheatProcessMemory(u64 proc_addr, const void *data, size_t size) {
return GetReference(g_cheat_process_manager).WriteCheatProcessMemory(proc_addr, data, size);
}
Result QueryCheatProcessMemory(svc::MemoryInfo *mapping, u64 address) {
return GetReference(g_cheat_process_manager).QueryCheatProcessMemory(mapping, address);
}
Result GetCheatCount(u64 *out_count) {
return GetReference(g_cheat_process_manager).GetCheatCount(out_count);
}
Result GetCheats(CheatEntry *cheats, size_t max_count, u64 *out_count, u64 offset) {
return GetReference(g_cheat_process_manager).GetCheats(cheats, max_count, out_count, offset);
}
Result GetCheatById(CheatEntry *out_cheat, u32 cheat_id) {
return GetReference(g_cheat_process_manager).GetCheatById(out_cheat, cheat_id);
}
Result ToggleCheat(u32 cheat_id) {
return GetReference(g_cheat_process_manager).ToggleCheat(cheat_id);
}
Result AddCheat(u32 *out_id, const CheatDefinition &def, bool enabled) {
return GetReference(g_cheat_process_manager).AddCheat(out_id, def, enabled);
}
Result RemoveCheat(u32 cheat_id) {
return GetReference(g_cheat_process_manager).RemoveCheat(cheat_id);
}
Result SetMasterCheat(const CheatDefinition &def) {
return GetReference(g_cheat_process_manager).SetMasterCheat(def);
}
Result ReadStaticRegister(u64 *out, size_t which) {
return GetReference(g_cheat_process_manager).ReadStaticRegister(out, which);
}
Result WriteStaticRegister(size_t which, u64 value) {
return GetReference(g_cheat_process_manager).WriteStaticRegister(which, value);
}
Result ResetStaticRegisters() {
return GetReference(g_cheat_process_manager).ResetStaticRegisters();
}
Result GetFrozenAddressCount(u64 *out_count) {
return GetReference(g_cheat_process_manager).GetFrozenAddressCount(out_count);
}
Result GetFrozenAddresses(FrozenAddressEntry *frz_addrs, size_t max_count, u64 *out_count, u64 offset) {
return GetReference(g_cheat_process_manager).GetFrozenAddresses(frz_addrs, max_count, out_count, offset);
}
Result GetFrozenAddress(FrozenAddressEntry *frz_addr, u64 address) {
return GetReference(g_cheat_process_manager).GetFrozenAddress(frz_addr, address);
}
Result EnableFrozenAddress(u64 *out_value, u64 address, u64 width) {
return GetReference(g_cheat_process_manager).EnableFrozenAddress(out_value, address, width);
}
Result DisableFrozenAddress(u64 address) {
return GetReference(g_cheat_process_manager).DisableFrozenAddress(address);
}
}
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