core: Add Insurgency support for amd64 Windows (#1295)

* Add basic Insurgency support on Windows x64

This allows SourceMod to load on x64 Insurgency. There are still a lot of variable truncation warnings that have to be dealt with.

* Fix 32bit builds

* Compile MySQL extension as well

The hack for __iob_func being removed from the core runtime, but required by the old mysql we're building against can be simplified a lot due to the `_ReturnAddress` intrinsic available since MSVC 2015.

* Don't include the offset we want to extract in the signature

extensions/mysql/msvc15hack.c

@@ -1,79 +1,37 @@
 
-#define WIN32_LEAN_AND_MEAN
 #include <Windows.h>
 #include <stdlib.h>
+#include <corecrt_wstdio.h>
+#include <intrin.h>
 
 // Fix from from https://stackoverflow.com/a/34655235.
 //
 // __iob_func required by the MySQL we use,
 // but no longer exists in the VS 14.0+ crt.
 
-#pragma comment(lib, "DbgHelp.lib")
-#pragma warning(disable:4091) // 'typedef ': ignored on left of '' when no variable is declared
-#include <DbgHelp.h>
-#include <corecrt_wstdio.h>
-
-#define GET_CURRENT_CONTEXT(c, contextFlags) \
-  do { \
-	c.ContextFlags = contextFlags; \
-	__asm    call x \
-	__asm x: pop eax \
-	__asm    mov c.Eip, eax \
-	__asm    mov c.Ebp, ebp \
-	__asm    mov c.Esp, esp \
-  } while(0);
-
+#pragma intrinsic(_ReturnAddress)
 
 FILE * __cdecl __iob_func(void)
 {
-	CONTEXT c = { 0 };
-	STACKFRAME64 s = { 0 };
-	DWORD imageType;
-	HANDLE hThread = GetCurrentThread();
-	HANDLE hProcess = GetCurrentProcess();
-
-	GET_CURRENT_CONTEXT(c, CONTEXT_FULL);
-
-	imageType = IMAGE_FILE_MACHINE_I386;
-	s.AddrPC.Offset = c.Eip;
-	s.AddrPC.Mode = AddrModeFlat;
-	s.AddrFrame.Offset = c.Ebp;
-	s.AddrFrame.Mode = AddrModeFlat;
-	s.AddrStack.Offset = c.Esp;
-	s.AddrStack.Mode = AddrModeFlat;
-
-	if (!StackWalk64(imageType, hProcess, hThread, &s, &c, NULL, SymFunctionTableAccess64, SymGetModuleBase64, NULL))
+	unsigned char const * assembly = (unsigned char const *)_ReturnAddress();
+	if (!assembly)
 	{
 		return NULL;
 	}
-
-	if (s.AddrReturn.Offset == 0)
+	
+	if (*assembly == 0x83 && *(assembly + 1) == 0xC0 && (*(assembly + 2) == 0x20 || *(assembly + 2) == 0x40))
 	{
-		return NULL;
-	}
-
-	{
-		unsigned char const * assembly = (unsigned char const *)(s.AddrReturn.Offset);
-
-		if (*assembly == 0x83 && *(assembly + 1) == 0xC0 && (*(assembly + 2) == 0x20 || *(assembly + 2) == 0x40))
+		if (*(assembly + 2) == 32)
 		{
-			if (*(assembly + 2) == 32)
-			{
-				return (FILE*)((unsigned char *)stdout - 32);
-			}
-			if (*(assembly + 2) == 64)
-			{
-				return (FILE*)((unsigned char *)stderr - 64);
-			}
-
+			return (FILE*)((unsigned char *)stdout - 32);
 		}
-		else
+		if (*(assembly + 2) == 64)
 		{
-			return stdin;
+			return (FILE*)((unsigned char *)stderr - 64);
 		}
 	}
-
-	return NULL;
+	
+	return stdin;
 }
 
 // Adapted from dosmap.c in Visual Studio 12.0 CRT sources.

extensions/mysql/mysql/MyDatabase.cpp

@@ -185,7 +185,7 @@ bool MyDatabase::DoSimpleQuery(const char *query)
 
 IQuery *MyDatabase::DoQuery(const char *query)
 {
-	if (mysql_real_query(m_mysql, query, strlen(query)) != 0)
+	if (mysql_real_query(m_mysql, query, static_cast<unsigned long>(strlen(query))) != 0)
 	{
 		return NULL;
 	}
@@ -216,7 +216,7 @@ bool MyDatabase::DoSimpleQueryEx(const char *query, size_t len)
 
 IQuery *MyDatabase::DoQueryEx(const char *query, size_t len)
 {
-	if (mysql_real_query(m_mysql, query, len) != 0)
+	if (mysql_real_query(m_mysql, query, static_cast<unsigned long>(len)) != 0)
 	{
 		return NULL;
 	}
@@ -258,7 +258,7 @@ IPreparedQuery *MyDatabase::PrepareQuery(const char *query, char *error, size_t
 		return NULL;
 	}
 
-	if (mysql_stmt_prepare(stmt, query, strlen(query)) != 0)
+	if (mysql_stmt_prepare(stmt, query, static_cast<unsigned long>(strlen(query))) != 0)
 	{
 		if (error)
 		{

extensions/mysql/mysql/MyDriver.cpp

@@ -224,7 +224,7 @@ void MyDriver::ShutdownThreadSafety()
 	mysql_thread_end();
 }
 
-unsigned int strncopy(char *dest, const char *src, size_t count)
+size_t strncopy(char *dest, const char *src, size_t count)
 {
 	if (!count)
 	{

extensions/mysql/mysql/MyDriver.h

@@ -88,6 +88,6 @@ private:
 
 extern MyDriver g_MyDriver;
 
-unsigned int strncopy(char *dest, const char *src, size_t count);
+size_t strncopy(char *dest, const char *src, size_t count);
 
 #endif //_INCLUDE_SM_MYSQL_DRIVER_H_

extensions/sdktools/vglobals.cpp

@@ -66,7 +66,12 @@ void InitializeValveGlobals()
 		{
 			return;
 		}
+#ifdef PLATFORM_X86
 		g_ppGameRules = *reinterpret_cast<void ***>(addr + offset);
+#else
+		int32_t varOffset = *(int32_t *) ((unsigned char *) addr + offset);
+		g_ppGameRules = *reinterpret_cast<void ***>((unsigned char *) addr + offset + sizeof(int32_t) + varOffset);
+#endif
 	}
 }