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Merge pull request #12915 from german77/cheat

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dmnt: cheats: Update cheat vm to latest version
This commit is contained in:
liamwhite 2024-02-05 13:41:21 -05:00 committed by GitHub
commit 74cc8721c7
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GPG key ID: B5690EEEBB952194
5 changed files with 103 additions and 49 deletions
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46
src/core/memory/cheat_engine.cpp
View file

@ -9,6 +9,7 @@
#include "core/core_timing.h"
#include "core/hle/kernel/k_page_table.h"
#include "core/hle/kernel/k_process.h"
#include "core/hle/kernel/k_process_page_table.h"
#include "core/hle/service/hid/hid_server.h"
#include "core/hle/service/sm/sm.h"
#include "core/memory.h"
@ -46,12 +47,23 @@ StandardVmCallbacks::StandardVmCallbacks(System& system_, const CheatProcessMeta
StandardVmCallbacks::~StandardVmCallbacks() = default;
void StandardVmCallbacks::MemoryRead(VAddr address, void* data, u64 size) {
system.ApplicationMemory().ReadBlock(SanitizeAddress(address), data, size);
void StandardVmCallbacks::MemoryReadUnsafe(VAddr address, void* data, u64 size) {
// Return zero on invalid address
if (!IsAddressInRange(address) || !system.ApplicationMemory().IsValidVirtualAddress(address)) {
std::memset(data, 0, size);
return;
}
void StandardVmCallbacks::MemoryWrite(VAddr address, const void* data, u64 size) {
system.ApplicationMemory().WriteBlock(SanitizeAddress(address), data, size);
system.ApplicationMemory().ReadBlock(address, data, size);
}
void StandardVmCallbacks::MemoryWriteUnsafe(VAddr address, const void* data, u64 size) {
// Skip invalid memory write address
if (!IsAddressInRange(address) || !system.ApplicationMemory().IsValidVirtualAddress(address)) {
return;
}
system.ApplicationMemory().WriteBlock(address, data, size);
}
u64 StandardVmCallbacks::HidKeysDown() {
@ -81,21 +93,25 @@ void StandardVmCallbacks::CommandLog(std::string_view data) {
data.back() == '\n' ? data.substr(0, data.size() - 1) : data);
}
VAddr StandardVmCallbacks::SanitizeAddress(VAddr in) const {
bool StandardVmCallbacks::IsAddressInRange(VAddr in) const {
if ((in < metadata.main_nso_extents.base ||
in >= metadata.main_nso_extents.base + metadata.main_nso_extents.size) &&
(in < metadata.heap_extents.base ||
in >= metadata.heap_extents.base + metadata.heap_extents.size)) {
LOG_ERROR(CheatEngine,
in >= metadata.heap_extents.base + metadata.heap_extents.size) &&
(in < metadata.alias_extents.base ||
in >= metadata.heap_extents.base + metadata.alias_extents.size) &&
(in < metadata.aslr_extents.base ||
in >= metadata.heap_extents.base + metadata.aslr_extents.size)) {
LOG_DEBUG(CheatEngine,
"Cheat attempting to access memory at invalid address={:016X}, if this "
"persists, "
"the cheat may be incorrect. However, this may be normal early in execution if "
"the game has not properly set up yet.",
in);
return 0; ///< Invalid addresses will hard crash
return false; ///< Invalid addresses will hard crash
}
return in;
return true;
}
CheatParser::~CheatParser() = default;
@ -211,16 +227,14 @@ void CheatEngine::Initialize() {
.base = GetInteger(page_table.GetHeapRegionStart()),
.size = page_table.GetHeapRegionSize(),
};
metadata.address_space_extents = {
.base = GetInteger(page_table.GetAddressSpaceStart()),
.size = page_table.GetAddressSpaceSize(),
};
metadata.alias_extents = {
metadata.aslr_extents = {
.base = GetInteger(page_table.GetAliasCodeRegionStart()),
.size = page_table.GetAliasCodeRegionSize(),
};
metadata.alias_extents = {
.base = GetInteger(page_table.GetAliasRegionStart()),
.size = page_table.GetAliasRegionSize(),
};
is_pending_reload.exchange(true);
}

8
src/core/memory/cheat_engine.h
View file

@ -27,17 +27,17 @@ public:
StandardVmCallbacks(System& system_, const CheatProcessMetadata& metadata_);
~StandardVmCallbacks() override;
void MemoryRead(VAddr address, void* data, u64 size) override;
void MemoryWrite(VAddr address, const void* data, u64 size) override;
void MemoryReadUnsafe(VAddr address, void* data, u64 size) override;
void MemoryWriteUnsafe(VAddr address, const void* data, u64 size) override;
u64 HidKeysDown() override;
void DebugLog(u8 id, u64 value) override;
void CommandLog(std::string_view data) override;
private:
VAddr SanitizeAddress(VAddr address) const;
bool IsAddressInRange(VAddr address) const;
const CheatProcessMetadata& metadata;
System& system;
Core::System& system;
};
// Intermediary class that parses a text file or other disk format for storing cheats into a

2
src/core/memory/dmnt_cheat_types.h
View file

@ -18,7 +18,7 @@ struct CheatProcessMetadata {
MemoryRegionExtents main_nso_extents{};
MemoryRegionExtents heap_extents{};
MemoryRegionExtents alias_extents{};
MemoryRegionExtents address_space_extents{};
MemoryRegionExtents aslr_extents{};
std::array<u8, 0x20> main_nso_build_id{};
};

66
src/core/memory/dmnt_cheat_vm.cpp
View file

@ -322,8 +322,9 @@ bool DmntCheatVm::DecodeNextOpcode(CheatVmOpcode& out) {
} break;
case CheatVmOpcodeType::EndConditionalBlock: {
// 20000000
// There's actually nothing left to process here!
opcode.opcode = EndConditionalOpcode{};
opcode.opcode = EndConditionalOpcode{
.is_else = ((first_dword >> 24) & 0xf) == 1,
};
} break;
case CheatVmOpcodeType::ControlLoop: {
// 300R0000 VVVVVVVV
@ -555,6 +556,18 @@ bool DmntCheatVm::DecodeNextOpcode(CheatVmOpcode& out) {
.idx = first_dword & 0xF,
};
} break;
case CheatVmOpcodeType::PauseProcess: {
/* FF0????? */
/* FF0 = opcode 0xFF0 */
/* Pauses the current process. */
opcode.opcode = PauseProcessOpcode{};
} break;
case CheatVmOpcodeType::ResumeProcess: {
/* FF0????? */
/* FF0 = opcode 0xFF0 */
/* Pauses the current process. */
opcode.opcode = ResumeProcessOpcode{};
} break;
case CheatVmOpcodeType::DebugLog: {
// FFFTIX##
// FFFTI0Ma aaaaaaaa
@ -621,7 +634,7 @@ bool DmntCheatVm::DecodeNextOpcode(CheatVmOpcode& out) {
return valid;
}
void DmntCheatVm::SkipConditionalBlock() {
void DmntCheatVm::SkipConditionalBlock(bool is_if) {
if (condition_depth > 0) {
// We want to continue until we're out of the current block.
const std::size_t desired_depth = condition_depth - 1;
@ -637,8 +650,12 @@ void DmntCheatVm::SkipConditionalBlock() {
// We also support nesting of conditional blocks, and Gateway does not.
if (skip_opcode.begin_conditional_block) {
condition_depth++;
} else if (std::holds_alternative<EndConditionalOpcode>(skip_opcode.opcode)) {
} else if (auto end_cond = std::get_if<EndConditionalOpcode>(&skip_opcode.opcode)) {
if (!end_cond->is_else) {
condition_depth--;
} else if (is_if && condition_depth - 1 == desired_depth) {
break;
}
}
}
} else {
@ -675,6 +692,10 @@ u64 DmntCheatVm::GetCheatProcessAddress(const CheatProcessMetadata& metadata,
return metadata.main_nso_extents.base + rel_address;
case MemoryAccessType::Heap:
return metadata.heap_extents.base + rel_address;
case MemoryAccessType::Alias:
return metadata.alias_extents.base + rel_address;
case MemoryAccessType::Aslr:
return metadata.aslr_extents.base + rel_address;
}
}
@ -682,7 +703,6 @@ void DmntCheatVm::ResetState() {
registers.fill(0);
saved_values.fill(0);
loop_tops.fill(0);
static_registers.fill(0);
instruction_ptr = 0;
condition_depth = 0;
decode_success = true;
@ -753,7 +773,7 @@ void DmntCheatVm::Execute(const CheatProcessMetadata& metadata) {
case 2:
case 4:
case 8:
callbacks->MemoryWrite(dst_address, &dst_value, store_static->bit_width);
callbacks->MemoryWriteUnsafe(dst_address, &dst_value, store_static->bit_width);
break;
}
} else if (auto begin_cond = std::get_if<BeginConditionalOpcode>(&cur_opcode.opcode)) {
@ -766,7 +786,7 @@ void DmntCheatVm::Execute(const CheatProcessMetadata& metadata) {
case 2:
case 4:
case 8:
callbacks->MemoryRead(src_address, &src_value, begin_cond->bit_width);
callbacks->MemoryReadUnsafe(src_address, &src_value, begin_cond->bit_width);
break;
}
// Check against condition.
@ -794,14 +814,19 @@ void DmntCheatVm::Execute(const CheatProcessMetadata& metadata) {
}
// Skip conditional block if condition not met.
if (!cond_met) {
SkipConditionalBlock();
SkipConditionalBlock(true);
}
} else if (std::holds_alternative<EndConditionalOpcode>(cur_opcode.opcode)) {
// Decrement the condition depth.
// We will assume, graciously, that mismatched conditional block ends are a nop.
} else if (auto end_cond = std::get_if<EndConditionalOpcode>(&cur_opcode.opcode)) {
if (end_cond->is_else) {
/* Skip to the end of the conditional block. */
this->SkipConditionalBlock(false);
} else {
/* Decrement the condition depth. */
/* We will assume, graciously, that mismatched conditional block ends are a nop. */
if (condition_depth > 0) {
condition_depth--;
}
}
} else if (auto ctrl_loop = std::get_if<ControlLoopOpcode>(&cur_opcode.opcode)) {
if (ctrl_loop->start_loop) {
// Start a loop.
@ -832,7 +857,7 @@ void DmntCheatVm::Execute(const CheatProcessMetadata& metadata) {
case 2:
case 4:
case 8:
callbacks->MemoryRead(src_address, &registers[ldr_memory->reg_index],
callbacks->MemoryReadUnsafe(src_address, &registers[ldr_memory->reg_index],
ldr_memory->bit_width);
break;
}
@ -849,7 +874,7 @@ void DmntCheatVm::Execute(const CheatProcessMetadata& metadata) {
case 2:
case 4:
case 8:
callbacks->MemoryWrite(dst_address, &dst_value, str_static->bit_width);
callbacks->MemoryWriteUnsafe(dst_address, &dst_value, str_static->bit_width);
break;
}
// Increment register if relevant.
@ -908,7 +933,7 @@ void DmntCheatVm::Execute(const CheatProcessMetadata& metadata) {
// Check for keypress.
if ((begin_keypress_cond->key_mask & kDown) != begin_keypress_cond->key_mask) {
// Keys not pressed. Skip conditional block.
SkipConditionalBlock();
SkipConditionalBlock(true);
}
} else if (auto perform_math_reg =
std::get_if<PerformArithmeticRegisterOpcode>(&cur_opcode.opcode)) {
@ -1007,7 +1032,7 @@ void DmntCheatVm::Execute(const CheatProcessMetadata& metadata) {
case 2:
case 4:
case 8:
callbacks->MemoryWrite(dst_address, &dst_value, str_register->bit_width);
callbacks->MemoryWriteUnsafe(dst_address, &dst_value, str_register->bit_width);
break;
}
@ -1086,7 +1111,8 @@ void DmntCheatVm::Execute(const CheatProcessMetadata& metadata) {
case 2:
case 4:
case 8:
callbacks->MemoryRead(cond_address, &cond_value, begin_reg_cond->bit_width);
callbacks->MemoryReadUnsafe(cond_address, &cond_value,
begin_reg_cond->bit_width);
break;
}
}
@ -1116,7 +1142,7 @@ void DmntCheatVm::Execute(const CheatProcessMetadata& metadata) {
// Skip conditional block if condition not met.
if (!cond_met) {
SkipConditionalBlock();
SkipConditionalBlock(true);
}
} else if (auto save_restore_reg =
std::get_if<SaveRestoreRegisterOpcode>(&cur_opcode.opcode)) {
@ -1178,6 +1204,10 @@ void DmntCheatVm::Execute(const CheatProcessMetadata& metadata) {
// Store a register to a static register.
static_registers[rw_static_reg->static_idx] = registers[rw_static_reg->idx];
}
} else if (std::holds_alternative<PauseProcessOpcode>(cur_opcode.opcode)) {
// TODO: Pause cheat process
} else if (std::holds_alternative<ResumeProcessOpcode>(cur_opcode.opcode)) {
// TODO: Resume cheat process
} else if (auto debug_log = std::get_if<DebugLogOpcode>(&cur_opcode.opcode)) {
// Read value from memory.
u64 log_value = 0;
@ -1224,7 +1254,7 @@ void DmntCheatVm::Execute(const CheatProcessMetadata& metadata) {
case 2:
case 4:
case 8:
callbacks->MemoryRead(val_address, &log_value, debug_log->bit_width);
callbacks->MemoryReadUnsafe(val_address, &log_value, debug_log->bit_width);
break;
}
}

22
src/core/memory/dmnt_cheat_vm.h
View file

@ -42,12 +42,16 @@ enum class CheatVmOpcodeType : u32 {
DoubleExtendedWidth = 0xF0,
// Double-extended width opcodes.
PauseProcess = 0xFF0,
ResumeProcess = 0xFF1,
DebugLog = 0xFFF,
};
enum class MemoryAccessType : u32 {
MainNso = 0,
Heap = 1,
Alias = 2,
Aslr = 3,
};
enum class ConditionalComparisonType : u32 {
@ -131,7 +135,9 @@ struct BeginConditionalOpcode {
VmInt value{};
};
struct EndConditionalOpcode {};
struct EndConditionalOpcode {
bool is_else;
};
struct ControlLoopOpcode {
bool start_loop{};
@ -222,6 +228,10 @@ struct ReadWriteStaticRegisterOpcode {
u32 idx{};
};
struct PauseProcessOpcode {};
struct ResumeProcessOpcode {};
struct DebugLogOpcode {
u32 bit_width{};
u32 log_id{};
@ -244,8 +254,8 @@ struct CheatVmOpcode {
PerformArithmeticStaticOpcode, BeginKeypressConditionalOpcode,
PerformArithmeticRegisterOpcode, StoreRegisterToAddressOpcode,
BeginRegisterConditionalOpcode, SaveRestoreRegisterOpcode,
SaveRestoreRegisterMaskOpcode, ReadWriteStaticRegisterOpcode, DebugLogOpcode,
UnrecognizedInstruction>
SaveRestoreRegisterMaskOpcode, ReadWriteStaticRegisterOpcode, PauseProcessOpcode,
ResumeProcessOpcode, DebugLogOpcode, UnrecognizedInstruction>
opcode{};
};
@ -256,8 +266,8 @@ public:
public:
virtual ~Callbacks();
virtual void MemoryRead(VAddr address, void* data, u64 size) = 0;
virtual void MemoryWrite(VAddr address, const void* data, u64 size) = 0;
virtual void MemoryReadUnsafe(VAddr address, void* data, u64 size) = 0;
virtual void MemoryWriteUnsafe(VAddr address, const void* data, u64 size) = 0;
virtual u64 HidKeysDown() = 0;
@ -296,7 +306,7 @@ private:
std::array<std::size_t, NumRegisters> loop_tops{};
bool DecodeNextOpcode(CheatVmOpcode& out);
void SkipConditionalBlock();
void SkipConditionalBlock(bool is_if);
void ResetState();
// For implementing the DebugLog opcode.