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-rw-r--r--src/core/memory/cheat_engine.cpp46
-rw-r--r--src/core/memory/cheat_engine.h8
-rw-r--r--src/core/memory/dmnt_cheat_types.h2
-rw-r--r--src/core/memory/dmnt_cheat_vm.cpp74
-rw-r--r--src/core/memory/dmnt_cheat_vm.h22
5 files changed, 103 insertions, 49 deletions
diff --git a/src/core/memory/cheat_engine.cpp b/src/core/memory/cheat_engine.cpp
index 96fa7fa3a..14d1a3840 100644
--- a/src/core/memory/cheat_engine.cpp
+++ b/src/core/memory/cheat_engine.cpp
@@ -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;
+ }
+
+ system.ApplicationMemory().ReadBlock(address, data, size);
}
-void StandardVmCallbacks::MemoryWrite(VAddr address, const void* data, u64 size) {
- system.ApplicationMemory().WriteBlock(SanitizeAddress(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);
}
diff --git a/src/core/memory/cheat_engine.h b/src/core/memory/cheat_engine.h
index ced2168d1..619cabaa2 100644
--- a/src/core/memory/cheat_engine.h
+++ b/src/core/memory/cheat_engine.h
@@ -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
diff --git a/src/core/memory/dmnt_cheat_types.h b/src/core/memory/dmnt_cheat_types.h
index c6b40e505..64c072d3d 100644
--- a/src/core/memory/dmnt_cheat_types.h
+++ b/src/core/memory/dmnt_cheat_types.h
@@ -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{};
};
diff --git a/src/core/memory/dmnt_cheat_vm.cpp b/src/core/memory/dmnt_cheat_vm.cpp
index 31ffc4fbb..8bc81e72d 100644
--- a/src/core/memory/dmnt_cheat_vm.cpp
+++ b/src/core/memory/dmnt_cheat_vm.cpp
@@ -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)) {
- condition_depth--;
+ } 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.
@@ -794,13 +814,18 @@ 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.
- if (condition_depth > 0) {
- condition_depth--;
+ } 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) {
@@ -832,8 +857,8 @@ void DmntCheatVm::Execute(const CheatProcessMetadata& metadata) {
case 2:
case 4:
case 8:
- callbacks->MemoryRead(src_address, &registers[ldr_memory->reg_index],
- ldr_memory->bit_width);
+ callbacks->MemoryReadUnsafe(src_address, &registers[ldr_memory->reg_index],
+ ldr_memory->bit_width);
break;
}
} else if (auto str_static = std::get_if<StoreStaticToAddressOpcode>(&cur_opcode.opcode)) {
@@ -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;
}
}
diff --git a/src/core/memory/dmnt_cheat_vm.h b/src/core/memory/dmnt_cheat_vm.h
index 641cb09c4..fed6a24ad 100644
--- a/src/core/memory/dmnt_cheat_vm.h
+++ b/src/core/memory/dmnt_cheat_vm.h
@@ -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.
generated by cgit v1.2.3 (git 2.25.1) at 2024-11-12 21:09:22 +0100