MIPSHooks for the Interpreter core

CMakeLists.txt

@@ -2269,6 +2269,8 @@ add_library(${CoreLibName} ${CoreLinkType}
 	Core/MIPS/MIPSStackWalk.h
 	Core/MIPS/MIPSTables.cpp
 	Core/MIPS/MIPSTables.h
+	Core/MIPS/MIPSHooks.cpp
+	Core/MIPS/MIPSHooks.h
 	Core/MIPS/MIPSVFPUUtils.cpp
 	Core/MIPS/MIPSVFPUUtils.h
 	Core/MIPS/MIPSVFPUFallbacks.cpp

Core/Core.vcxproj

@@ -989,6 +989,7 @@
     <ClCompile Include="MIPS\MIPSIntVFPU.cpp" />
     <ClCompile Include="MIPS\MIPSTables.cpp" />
     <ClCompile Include="MIPS\MIPSVFPUUtils.cpp" />
+    <ClCompile Include="MIPS\MIPSHooks.cpp" />
     <ClCompile Include="MIPS\MIPS\MipsJit.cpp">
       <ExcludedFromBuild Condition="'$(Configuration)|$(Platform)'=='Debug|Win32'">true</ExcludedFromBuild>
       <ExcludedFromBuild Condition="'$(Configuration)|$(Platform)'=='Release|Win32'">true</ExcludedFromBuild>
@@ -1400,6 +1401,7 @@
     <ClInclude Include="MIPS\MIPSIntVFPU.h" />
     <ClInclude Include="MIPS\MIPSTables.h" />
     <ClInclude Include="MIPS\MIPSVFPUUtils.h" />
+    <ClInclude Include="MIPS\MIPSHooks.h" />
     <ClInclude Include="MIPS\MIPS\MipsJit.h">
       <ExcludedFromBuild Condition="'$(Configuration)|$(Platform)'=='Debug|Win32'">true</ExcludedFromBuild>
       <ExcludedFromBuild Condition="'$(Configuration)|$(Platform)'=='Release|Win32'">true</ExcludedFromBuild>

Core/Core.vcxproj.filters

@@ -129,6 +129,9 @@
     <ClCompile Include="MIPS\MIPSCodeUtils.cpp">
       <Filter>MIPS</Filter>
     </ClCompile>
+    <ClCompile Include="MIPS\MIPSHooks.cpp">
+      <Filter>MIPS</Filter>
+    </ClCompile>
     <ClCompile Include="MIPS\x86\CompALU.cpp">
       <Filter>MIPS\x86</Filter>
     </ClCompile>
@@ -1344,6 +1347,9 @@
     <ClInclude Include="MIPS\MIPSCodeUtils.h">
       <Filter>MIPS</Filter>
     </ClInclude>
+    <ClInclude Include="MIPS\MIPSHooks.h">
+      <Filter>MIPS</Filter>
+    </ClInclude>
     <ClInclude Include="MIPS\x86\Jit.h">
       <Filter>MIPS\x86</Filter>
     </ClInclude>

Core/MIPS/MIPSHooks.cpp

@@ -0,0 +1,49 @@
+// Copyright (c) 2024- PPSSPP Project.
+
+// This program is free software: you can redistribute it and/or modify
+// it under the terms of the GNU General Public License as published by
+// the Free Software Foundation, version 2.0 or later versions.
+
+// This program is distributed in the hope that 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 2.0 for more details.
+
+// A copy of the GPL 2.0 should have been included with the program.
+// If not, see http://www.gnu.org/licenses/
+
+// Official git repository and contact information can be found at
+// https://github.com/hrydgard/ppsspp and http://www.ppsspp.org/.
+
+#include "Core/MIPS/MIPSHooks.h"
+
+#include <map>
+#include <vector>
+
+
+MIPSNames MIPSNameLookupTable;
+static std::vector<std::pair<MIPSInstruction*, MIPSInterpretFunc>> stack;
+
+namespace MIPSHooks {
+
+	void Reset() {
+		INFO_LOG(CPU, "Resetting the interpreter hooks");
+		for (auto&[instr, func] : stack) {
+			instr->interpret = func;
+			VERBOSE_LOG(CPU, "Resetting %s", instr->name);
+		}
+		stack.clear();
+	}
+
+	void Hook(const char* name, MIPSInterpretFunc func) {
+		auto current_handler = MIPSNameLookupTable.GetInstructionByName(name);
+		if (!current_handler) {
+			WARN_LOG(CPU, "Cannot setup a hook: unknown instruction '%s'", name);
+			return;
+		}
+
+		stack.emplace_back(current_handler, current_handler->interpret);
+		current_handler->interpret = func;
+		INFO_LOG(CPU, "Enabled a hook for %s", name);
+	}
+}

Core/MIPS/MIPSHooks.h

@@ -0,0 +1,59 @@
+// Copyright (c) 2024- PPSSPP Project.
+
+// This program is free software: you can redistribute it and/or modify
+// it under the terms of the GNU General Public License as published by
+// the Free Software Foundation, version 2.0 or later versions.
+
+// This program is distributed in the hope that 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 2.0 for more details.
+
+// A copy of the GPL 2.0 should have been included with the program.
+// If not, see http://www.gnu.org/licenses/
+
+// Official git repository and contact information can be found at
+// https://github.com/hrydgard/ppsspp and http://www.ppsspp.org/.
+
+#pragma once
+
+#include <map>
+
+#include "Core/MIPS/MIPSTables.h"
+#include "Common/Log.h"
+
+class MIPSNames {
+private:
+	std::map<std::string, MIPSInstruction*> name_lookup_table;
+public:
+	template <size_t size>
+	void RegisterInstructions(MIPSInstruction (&table)[size]) {
+		for (uint32_t i = 0; i < size; ++i) {
+			// register the name if it's valid
+			if (table[i].name) {
+				name_lookup_table.emplace(table[i].name, &table[i]);
+				VERBOSE_LOG(CPU, "Registered %s", table[i].name);
+			}
+		}
+	}
+
+	MIPSInstruction* GetInstructionByName(std::string name) {
+		auto it = name_lookup_table.find(name);
+		if (it == name_lookup_table.end()) {
+			return nullptr;
+		}
+		return it->second;
+	}
+};
+
+extern MIPSNames MIPSNameLookupTable;
+
+namespace MIPSHooks {
+	// Fills the MIPSNameLookupTable
+	void Init();
+	// Disables the hooks
+	void Reset();
+	// Tries to register a hook
+	void Hook(const char* name, MIPSInterpretFunc func);
+}
+