Index: a/src/coreclr/ilasm/writer.cpp

===================================================================

--- a/src/coreclr/ilasm/writer.cpp

+++ b/src/coreclr/ilasm/writer.cpp

@@ -212,26 +212,28 @@ HRESULT Assembler::CreateDebugDirectory(

     param.debugDirData = NULL;

     // get module ID

-    DWORD rsds = 0x53445352;

-    DWORD pdbAge = 0x1;

+    DWORD rsds = VAL32(0x53445352);

+    DWORD pdbAge = VAL32(0x1);

+    GUID pdbGuid = *m_pPortablePdbWriter->GetGuid();

+    SwapGuid(&pdbGuid);

     DWORD len = sizeof(rsds) + sizeof(GUID) + sizeof(pdbAge) + (DWORD)strlen(m_szPdbFileName) + 1;

     BYTE* dbgDirData = new BYTE[len];

     DWORD offset = 0;

     memcpy_s(dbgDirData + offset, len, &rsds, sizeof(rsds));                            // RSDS

     offset += sizeof(rsds);

-    memcpy_s(dbgDirData + offset, len, m_pPortablePdbWriter->GetGuid(), sizeof(GUID)); // PDB GUID

+    memcpy_s(dbgDirData + offset, len, &pdbGuid, sizeof(GUID));                         // PDB GUID

     offset += sizeof(GUID);

     memcpy_s(dbgDirData + offset, len, &pdbAge, sizeof(pdbAge));                        // PDB AGE

     offset += sizeof(pdbAge);

     memcpy_s(dbgDirData + offset, len, m_szPdbFileName, strlen(m_szPdbFileName) + 1);   // PDB PATH

     debugDirIDD.Characteristics = 0;

-    debugDirIDD.TimeDateStamp = m_pPortablePdbWriter->GetTimestamp();

-    debugDirIDD.MajorVersion = 0x100;

-    debugDirIDD.MinorVersion = 0x504d;

-    debugDirIDD.Type = IMAGE_DEBUG_TYPE_CODEVIEW;

-    debugDirIDD.SizeOfData = len;

+    debugDirIDD.TimeDateStamp = VAL32(m_pPortablePdbWriter->GetTimestamp());

+    debugDirIDD.MajorVersion = VAL16(0x100);

+    debugDirIDD.MinorVersion = VAL16(0x504d);

+    debugDirIDD.Type = VAL32(IMAGE_DEBUG_TYPE_CODEVIEW);

+    debugDirIDD.SizeOfData = VAL32(len);

     debugDirIDD.AddressOfRawData = 0; // will be updated bellow

     debugDirIDD.PointerToRawData = 0; // will be updated bellow

Index: a/src/coreclr/md/enc/pdbheap.cpp

===================================================================

--- a/src/coreclr/md/enc/pdbheap.cpp

+++ b/src/coreclr/md/enc/pdbheap.cpp

@@ -26,6 +26,16 @@ HRESULT PdbHeap::SetData(PORT_PDB_STREAM

         (sizeof(ULONG) * data->typeSystemTableRowsSize);

     m_data = new BYTE[m_size];

+#if BIGENDIAN

+    PORT_PDB_STREAM swappedData = *data;

+    SwapGuid(&swappedData.id.pdbGuid);

+    swappedData.id.pdbTimeStamp = VAL32(swappedData.id.pdbTimeStamp);

+    swappedData.entryPoint = VAL32(swappedData.entryPoint);

+    swappedData.referencedTypeSystemTables = VAL64(swappedData.referencedTypeSystemTables);

+    // typeSystemTableRows and typeSystemTableRowsSize handled below

+    data = &swappedData;

+#endif

+

     ULONG offset = 0;

     if (memcpy_s(m_data + offset, m_size, &data->id, sizeof(data->id)))

         return E_FAIL;

@@ -39,9 +49,17 @@ HRESULT PdbHeap::SetData(PORT_PDB_STREAM

         return E_FAIL;

     offset += sizeof(data->referencedTypeSystemTables);

+#if !BIGENDIAN

     if (memcpy_s(m_data + offset, m_size, data->typeSystemTableRows, sizeof(ULONG) * data->typeSystemTableRowsSize))

         return E_FAIL;

     offset += sizeof(ULONG) * data->typeSystemTableRowsSize;

+#else

+    for (int i = 0; i < data->typeSystemTableRowsSize; i++)

+    {

+        SET_UNALIGNED_VAL32(m_data + offset, data->typeSystemTableRows[i]);

+        offset += sizeof(ULONG);

+    }

+#endif

     _ASSERTE(offset == m_size);