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dmnt: cheats: Silence memory errors

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This commit is contained in:
german77 2024-02-05 11:06:25 -06:00
parent 504abbd6e0
commit 8113f55f4b
4 changed files with 32 additions and 20 deletions
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25
src/core/memory/cheat_engine.cpp
View file

@ -47,12 +47,23 @@ StandardVmCallbacks::StandardVmCallbacks(System& system_, const CheatProcessMeta
StandardVmCallbacks::~StandardVmCallbacks() = default; StandardVmCallbacks::~StandardVmCallbacks() = default;
void StandardVmCallbacks::MemoryRead(VAddr address, void* data, u64 size) { void StandardVmCallbacks::MemoryReadUnsafe(VAddr address, void* data, u64 size) {
system.ApplicationMemory().ReadBlock(SanitizeAddress(address), data, 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) { void StandardVmCallbacks::MemoryWriteUnsafe(VAddr address, const void* data, u64 size) {
system.ApplicationMemory().WriteBlock(SanitizeAddress(address), data, size); // Skip invalid memory write address
if (!IsAddressInRange(address) || !system.ApplicationMemory().IsValidVirtualAddress(address)) {
return;
}
system.ApplicationMemory().WriteBlock(address, data, size);
} }
u64 StandardVmCallbacks::HidKeysDown() { u64 StandardVmCallbacks::HidKeysDown() {
@ -82,7 +93,7 @@ void StandardVmCallbacks::CommandLog(std::string_view data) {
data.back() == '\n' ? data.substr(0, data.size() - 1) : 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 || if ((in < metadata.main_nso_extents.base ||
in >= metadata.main_nso_extents.base + metadata.main_nso_extents.size) && in >= metadata.main_nso_extents.base + metadata.main_nso_extents.size) &&
(in < metadata.heap_extents.base || (in < metadata.heap_extents.base ||
@ -97,10 +108,10 @@ VAddr StandardVmCallbacks::SanitizeAddress(VAddr in) const {
"the cheat may be incorrect. However, this may be normal early in execution if " "the cheat may be incorrect. However, this may be normal early in execution if "
"the game has not properly set up yet.", "the game has not properly set up yet.",
in); in);
return 0; ///< Invalid addresses will hard crash return false; ///< Invalid addresses will hard crash
} }
return in; return true;
} }
CheatParser::~CheatParser() = default; CheatParser::~CheatParser() = default;

6
src/core/memory/cheat_engine.h
View file

@ -27,14 +27,14 @@ public:
StandardVmCallbacks(System& system_, const CheatProcessMetadata& metadata_); StandardVmCallbacks(System& system_, const CheatProcessMetadata& metadata_);
~StandardVmCallbacks() override; ~StandardVmCallbacks() override;
void MemoryRead(VAddr address, void* data, u64 size) override; void MemoryReadUnsafe(VAddr address, void* data, u64 size) override;
void MemoryWrite(VAddr address, const void* data, u64 size) override; void MemoryWriteUnsafe(VAddr address, const void* data, u64 size) override;
u64 HidKeysDown() override; u64 HidKeysDown() override;
void DebugLog(u8 id, u64 value) override; void DebugLog(u8 id, u64 value) override;
void CommandLog(std::string_view data) override; void CommandLog(std::string_view data) override;
private: private:
VAddr SanitizeAddress(VAddr address) const; bool IsAddressInRange(VAddr address) const;
const CheatProcessMetadata& metadata; const CheatProcessMetadata& metadata;
Core::System& system; Core::System& system;

15
src/core/memory/dmnt_cheat_vm.cpp
View file

@ -773,7 +773,7 @@ void DmntCheatVm::Execute(const CheatProcessMetadata& metadata) {
case 2: case 2:
case 4: case 4:
case 8: case 8:
callbacks->MemoryWrite(dst_address, &dst_value, store_static->bit_width); callbacks->MemoryWriteUnsafe(dst_address, &dst_value, store_static->bit_width);
break; break;
} }
} else if (auto begin_cond = std::get_if<BeginConditionalOpcode>(&cur_opcode.opcode)) { } else if (auto begin_cond = std::get_if<BeginConditionalOpcode>(&cur_opcode.opcode)) {
@ -786,7 +786,7 @@ void DmntCheatVm::Execute(const CheatProcessMetadata& metadata) {
case 2: case 2:
case 4: case 4:
case 8: case 8:
callbacks->MemoryRead(src_address, &src_value, begin_cond->bit_width); callbacks->MemoryReadUnsafe(src_address, &src_value, begin_cond->bit_width);
break; break;
} }
// Check against condition. // Check against condition.
@ -857,7 +857,7 @@ void DmntCheatVm::Execute(const CheatProcessMetadata& metadata) {
case 2: case 2:
case 4: case 4:
case 8: case 8:
callbacks->MemoryRead(src_address, &registers[ldr_memory->reg_index], callbacks->MemoryReadUnsafe(src_address, &registers[ldr_memory->reg_index],
ldr_memory->bit_width); ldr_memory->bit_width);
break; break;
} }
@ -874,7 +874,7 @@ void DmntCheatVm::Execute(const CheatProcessMetadata& metadata) {
case 2: case 2:
case 4: case 4:
case 8: case 8:
callbacks->MemoryWrite(dst_address, &dst_value, str_static->bit_width); callbacks->MemoryWriteUnsafe(dst_address, &dst_value, str_static->bit_width);
break; break;
} }
// Increment register if relevant. // Increment register if relevant.
@ -1032,7 +1032,7 @@ void DmntCheatVm::Execute(const CheatProcessMetadata& metadata) {
case 2: case 2:
case 4: case 4:
case 8: case 8:
callbacks->MemoryWrite(dst_address, &dst_value, str_register->bit_width); callbacks->MemoryWriteUnsafe(dst_address, &dst_value, str_register->bit_width);
break; break;
} }
@ -1111,7 +1111,8 @@ void DmntCheatVm::Execute(const CheatProcessMetadata& metadata) {
case 2: case 2:
case 4: case 4:
case 8: 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; break;
} }
} }
@ -1253,7 +1254,7 @@ void DmntCheatVm::Execute(const CheatProcessMetadata& metadata) {
case 2: case 2:
case 4: case 4:
case 8: case 8:
callbacks->MemoryRead(val_address, &log_value, debug_log->bit_width); callbacks->MemoryReadUnsafe(val_address, &log_value, debug_log->bit_width);
break; break;
} }
} }

4
src/core/memory/dmnt_cheat_vm.h
View file

@ -266,8 +266,8 @@ public:
public: public:
virtual ~Callbacks(); virtual ~Callbacks();
virtual void MemoryRead(VAddr address, void* data, u64 size) = 0; virtual void MemoryReadUnsafe(VAddr address, void* data, u64 size) = 0;
virtual void MemoryWrite(VAddr address, const void* data, u64 size) = 0; virtual void MemoryWriteUnsafe(VAddr address, const void* data, u64 size) = 0;
virtual u64 HidKeysDown() = 0; virtual u64 HidKeysDown() = 0;