Fix WER handler on Windows (#106217)

src/coreclr/debug/daccess/daccess.cpp

@@ -34,6 +34,8 @@ extern "C" bool TryGetSymbol(ICorDebugDataTarget* dataTarget, uint64_t baseAddre
 #define CAN_USE_CDAC
 #endif
 
+extern TADDR g_ClrModuleBase;
+
 #include "dwbucketmanager.hpp"
 #include "gcinterface.dac.h"
 
@@ -5531,6 +5533,15 @@ ClrDataAccess::Initialize(void)
     // Do some validation
     IfFailRet(VerifyDlls());
 
+    // To support EH SxS, utilcode requires the base address of the runtime as part of its initialization
+    // so that functions like "WasThrownByUs" work correctly since they use the CLR base address to check
+    // if an exception was raised by a given instance of the runtime or not.
+    //
+    // Thus, when DAC is initialized, initialize utilcode with the base address of the runtime loaded in the
+    // target process. This is similar to work done in CorDB::SetTargetCLR for mscordbi.
+
+    g_ClrModuleBase = m_globalBase; // Base address of the runtime in the target process
+
     return S_OK;
 }
 

src/coreclr/utilcode/clrhost.cpp

@@ -18,6 +18,17 @@ extern "C" IMAGE_DOS_HEADER __ImageBase;
 static void* pImageBase = NULL;
 #endif
 
+#ifdef DACCESS_COMPILE
+
+TADDR g_ClrModuleBase;
+
+void* GetClrModuleBase()
+{
+    return (void*)g_ClrModuleBase;
+}
+
+#else // DACCESS_COMPILE
+
 void* GetClrModuleBase()
 {
     LIMITED_METHOD_CONTRACT;
@@ -37,6 +48,8 @@ void* GetClrModuleBase()
 #endif // HOST_WINDOWS
 }
 
+#endif // DACCESS_COMPILE
+
 thread_local int t_CantAllocCount;
 
 DWORD GetClrModulePathName(SString& buffer)