From b47a2dabbc142c25c7ae9cb0caab55d23a967a3c Mon Sep 17 00:00:00 2001
From: momo5502 <mauriceheumann@gmail.com>
Date: Sat, 19 Jan 2019 13:00:46 +0100
Subject: [PATCH] Add longjump hook

---
 src/game/game.cpp      |  4 ++++
 src/game/game.hpp      |  2 ++
 src/module/patches.cpp | 13 +++++++++++++
 3 files changed, 19 insertions(+)

diff --git a/src/game/game.cpp b/src/game/game.cpp
index e4ab61c..f46d0ff 100644
--- a/src/game/game.cpp
+++ b/src/game/game.cpp
@@ -27,6 +27,8 @@ namespace game
 
 		VM_Notify_t VM_Notify;
 
+		decltype(longjmp)* _longjmp;
+
 		int* cmd_args;
 		int* cmd_argc;
 		const char*** cmd_argv;
@@ -208,6 +210,8 @@ namespace game
 
 		native::VM_Notify = native::VM_Notify_t(SELECT_VALUE(0x610200, 0x569720, 0x4EF450));
 
+		native::_longjmp = reinterpret_cast<decltype(longjmp)*>(SELECT_VALUE(0x73AC20, 0x7363BC, 0x655558));
+
 		native::cmd_args = reinterpret_cast<int*>(SELECT_VALUE(0x1750750, 0x1C978D0, 0x1B455F8));
 		native::cmd_argc = reinterpret_cast<int*>(SELECT_VALUE(0x1750794, 0x1C97914, 0x1B4563C));
 		native::cmd_argv = reinterpret_cast<const char***>(SELECT_VALUE(0x17507B4, 0x1C97934, 0x1B4565C));
diff --git a/src/game/game.hpp b/src/game/game.hpp
index cbb03f3..edf4645 100644
--- a/src/game/game.hpp
+++ b/src/game/game.hpp
@@ -42,6 +42,8 @@ namespace game
 		typedef void (*VM_Notify_t)(unsigned int notifyListOwnerId, unsigned int stringValue, VariableValue* top);
 		extern VM_Notify_t VM_Notify;
 
+		extern decltype(longjmp)* _longjmp;
+
 		extern int* cmd_args;
 		extern int* cmd_argc;
 		extern const char*** cmd_argv;
diff --git a/src/module/patches.cpp b/src/module/patches.cpp
index d3e893b..6285af9 100644
--- a/src/module/patches.cpp
+++ b/src/module/patches.cpp
@@ -13,6 +13,8 @@ public:
 		if (game::is_sp()) this->patch_sp();
 		else if (game::is_mp()) this->patch_mp();
 		else if (game::is_dedi()) this->patch_dedi();
+
+		utils::hook(game::native::_longjmp, long_jump_stub, HOOK_JUMP).install()->quick();
 	}
 
 private:
@@ -43,6 +45,17 @@ private:
 	void patch_dedi() const
 	{
 	}
+
+	static __declspec(noreturn) void long_jump_stub(jmp_buf buf, const int value) noexcept(false)
+	{
+#ifdef DEBUG
+		{
+			printf("Unwinding the stack...\n");
+		}
+#endif
+
+		longjmp(buf, value);
+	}
 };
 
 REGISTER_MODULE(patches)