[PATCH 2/2] Fix debug exceptions from VM86

[Petr Tesarik]

Hi,

when I applied my last patch, I still experienced problems running
VM86 code in a debugger. This involved many issues:

1. save_vm86_context() didn't set the ContextFlags (which was not a
   problem before).

2. we can't call raise_trap_exception() for VM86, as this routine ends
   with a call to NtSetContextThread(), but that call can't return to
   VM86.

3. the TF bit must not be reset in the exception context;

4. it should be reset by the DOS VM in winedos

This patch fixes points 4.

ChangeLog:

* Clear TF bit before passing control to a VM86 interrupt handler
-------------- next part --------------
Index: interrupts.c
===================================================================
RCS file: /home/wine/wine/dlls/winedos/interrupts.c,v
retrieving revision 1.26
diff -u -r1.26 interrupts.c
--- interrupts.c	3 Jan 2005 20:04:54 -0000	1.26
+++ interrupts.c	27 Mar 2006 08:13:22 -0000
@@ -514,8 +514,8 @@
          context->SegCs = SELECTOROF( handler );
          context->Eip   = OFFSETOF( handler );
 
-         /* Clear virtual interrupt flag. */
-         context->EFlags &= ~VIF_MASK;
+         /* Clear virtual interrupt flag and trap flag. */
+         context->EFlags &= ~(VIF_MASK | TF_MASK);
      }
 }