fix freebsd SIGBUS

Author: lizzie

src/core/address_space.cpp

@@ -632,16 +632,18 @@ struct AddressSpace::Impl {
             mmap(reinterpret_cast<void*>(USER_MIN), user_size, protection_flags, map_flags, -1, 0));
 #else
         const auto virtual_size = system_managed_size + system_reserved_size + user_size;
-#if defined(ARCH_X86_64)
+#if defined(ARCH_X86_64) && !defined(__FreeBSD__)
         const auto virtual_base =
             reinterpret_cast<u8*>(mmap(reinterpret_cast<void*>(SYSTEM_MANAGED_MIN), virtual_size,
                                        protection_flags, map_flags, -1, 0));
         system_managed_base = virtual_base;
         system_reserved_base = reinterpret_cast<u8*>(SYSTEM_RESERVED_MIN);
         user_base = reinterpret_cast<u8*>(USER_MIN);
 #else
+        // FreeBSD can't stand MAP_FIXED or it may overwrite mmap() itself!
         // Map memory wherever possible and instruction translation can handle offsetting to the
         // base.
+        map_flags &= ~MAP_FIXED;
         const auto virtual_base =
             reinterpret_cast<u8*>(mmap(nullptr, virtual_size, protection_flags, map_flags, -1, 0));
         system_managed_base = virtual_base;

src/sdl_window.cpp

@@ -331,7 +331,8 @@ WindowSDL::WindowSDL(s32 width_, s32 height_, Input::GameController* controller_
     window_info.type = WindowSystemType::Windows;
     window_info.render_surface = SDL_GetPointerProperty(SDL_GetWindowProperties(window),
                                                         SDL_PROP_WINDOW_WIN32_HWND_POINTER, NULL);
-#elif defined(SDL_PLATFORM_LINUX)
+#elif defined(SDL_PLATFORM_LINUX) || defined(__FreeBSD__)
+    // SDL doesn't have a platform define for FreeBSD AAAAAAAAAA
     if (SDL_strcmp(SDL_GetCurrentVideoDriver(), "x11") == 0) {
         window_info.type = WindowSystemType::X11;
         window_info.display_connection = SDL_GetPointerProperty(