Thunk pool implementation for CoreRT. In CoreRT, the thunk mappings are allocated dynamically in memory using VirtualAlloc. The thunk stubs pages are marked with RX permissions and the thunks data pages are marked with RW permissions.

Refactored some code in ThunkPool.cs to remove from it any knowledge about the thunk sections layout. Thunks layout and allocation become a black box to ThunkPool.cs. All the section layout information is moved to the native component, and section navigation is done by calls to some APIs.

The dynamically allocated thunks pages are enabled by a FEATURE_RX_THUNKS, and only in CoreRT's Full build for now. The portable build doesn't yet support thunks.

[tfs-changeset: 1638131]

1 files changed, 6 insertions, 0 deletions

diff --git a/src/Native/Runtime/windows/PalRedhawkMinWin.cpp b/src/Native/Runtime/windows/PalRedhawkMinWin.cpp
index b17b7da1b..49097edd3 100644
--- a/src/Native/Runtime/windows/PalRedhawkMinWin.cpp
+++ b/src/Native/Runtime/windows/PalRedhawkMinWin.cpp
@@ -1318,6 +1318,12 @@ REDHAWK_PALEXPORT UInt32_BOOL REDHAWK_PALAPI PalVirtualFree(_In_ void* pAddress,
 }
 #pragma warning (pop)
 
+REDHAWK_PALEXPORT UInt32_BOOL REDHAWK_PALAPI PalVirtualProtect(_In_ void* pAddress, UIntNative size, UInt32 protect)
+{
+    DWORD oldProtect;
+    return VirtualProtect(pAddress, size, protect, &oldProtect);
+}
+
 REDHAWK_PALEXPORT _Ret_maybenull_ void* REDHAWK_PALAPI PalSetWerDataBuffer(_In_ void* pNewBuffer)
 {
     static void* pBuffer;