ntdll: Don't send EXCEPTION_EXECUTE_FAULT to Windows programs that didn't enable DEP.

[Michael Karcher]

This is a way to fix the non-functional single-stepping in Delphi,
as reported for example in
 http://appdb.winehq.org/objectManager.php?sClass=version&iId=22&iTestingId=10795

If Delphi looses track on single stepping what module might contain the
next executed line, it write-protects a lot of pages to catch execution
flow. The exception handler unprotects used pages and sets breakpoints
to all interesting code locations in them if a EXCEPTION_READ_FAULT or
EXCEPTION_WRITE_FAULT occurs for these pages - it doesn't handle
EXCEPTION_EXECUTE_FAULT. As long as the force_exec mode is enabled
there is no data execution prevention - thus returning the compatible
EXCEPTION_READ_FAULT seems appropriate.
---
 dlls/ntdll/ntdll_misc.h  |    1 +
 dlls/ntdll/signal_i386.c |    7 +++++++
 dlls/ntdll/virtual.c     |    9 +++++++++
 3 files changed, 17 insertions(+), 0 deletions(-)

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