Add an ExceptionBarrier around outbound calls to patched methods in IE. In so...

chrome_frame/exception_barrier_lowlevel.asm

+; Copyright (c) 2010 The Chromium Authors. All rights reserved.
+; Use of this source code is governed by a BSD-style license that can be
+; found in the LICENSE file.
+;
+; Tag the exception handler as an SEH handler in case the executable
+; is linked with /SAFESEH (which is the default).
+;
+; MASM 8.0 inserts an additional leading underscore in front of names
+; and this is an attempted fix until we understand why.
+IF @version LT 800
+_ExceptionBarrierHandler PROTO
+.SAFESEH _ExceptionBarrierHandler
+ELSE
+ExceptionBarrierHandler PROTO
+.SAFESEH ExceptionBarrierHandler
+ENDIF
+
+.586
+.MODEL FLAT, STDCALL
+ASSUME FS:NOTHING
+.CODE
+
+; extern "C" void WINAPI RegisterExceptionRecord(
+;                          EXCEPTION_REGISTRATION *registration,
+;                          ExceptionHandlerFunc func);
+RegisterExceptionRecord PROC registration:DWORD, func:DWORD
+OPTION PROLOGUE:None
+OPTION EPILOGUE:None
+  mov   edx, DWORD PTR [esp + 4]  ; edx is registration
+  mov   eax, DWORD PTR [esp + 8] ; eax is func
+  mov   DWORD PTR [edx + 4], eax
+  mov   eax, FS:[0]
+  mov   DWORD PTR [edx], eax
+  mov   FS:[0], edx
+  ret   8
+
+RegisterExceptionRecord ENDP
+
+; extern "C" void UnregisterExceptionRecord(
+;                           EXCEPTION_REGISTRATION *registration);
+UnregisterExceptionRecord PROC registration:DWORD
+OPTION PROLOGUE:None
+OPTION EPILOGUE:None
+
+  mov   edx, DWORD PTR [esp + 4]
+  mov   eax, [edx]
+  mov   FS:[0], eax
+  ret   4
+
+UnregisterExceptionRecord ENDP
+
+END