Merge pull request #5484 from neobrain/fix_code_cache_no_guest_wrappers

CodeCache: Fix crash when guest library wrappers aren't installed

Source/Tools/FEXInterpreter/FEXInterpreter.cpp

@@ -601,8 +601,10 @@ int main(int argc, char** argv, char** const envp) {
     // Request code cache generation
     FEXServerClient::PopulateCodeCache(FEXServerClient::GetServerFD(), Loader.GetMainElfFD(), FEXCore::Config::Get_MULTIBLOCK());
 
-    // Finalize code cache for libVDSO-guest.so. This needs to be done explicitly since VDSO doesn't use LoadLib.
-    SyscallHandler->TriggerGuestLibWrapperCodeCacheLoad(*ParentThread->Thread, reinterpret_cast<uintptr_t>(VDSOMapping.VDSOBase));
+    if (VDSOMapping) {
+      // Finalize code cache for libVDSO-guest.so. This needs to be done explicitly since VDSO doesn't use LoadLib.
+      SyscallHandler->TriggerGuestLibWrapperCodeCacheLoad(*ParentThread->Thread, reinterpret_cast<uintptr_t>(VDSOMapping.VDSOBase));
+    }
   }
 
   // Pull RIP and stack pointer from loader and set the thread data to it.

Source/Tools/LinuxEmulation/VDSO_Emulation.h

@@ -21,6 +21,10 @@ struct VDSOMapping {
   size_t VDSOSize {};
   void* X86GeneratedCodePtr {};
   size_t X86GeneratedCodeSize {};
+
+  explicit operator bool() const {
+    return VDSOBase != nullptr;
+  }
 };
 
 struct VDSOEntrypoints {