reactos/ntoskrnl/ps/i386/continue.c

   1 /* $Id$
   2  *
   3  * COPYRIGHT:              See COPYING in the top level directory
   4  * PROJECT:                ReactOS kernel
   5  * FILE:                   ntoskrnl/ps/i386/continue.c
   6  * PURPOSE:                i386 implementation of NtContinue()
   7  * PROGRAMMER:             Royce Mitchell III, kjk_hyperion
   8  * REVISION HISTORY:
   9  *               29/06/04: Created
  10  */
  11
  12 /* INCLUDES ****************************************************************/
  13
  14 #include <ntoskrnl.h>
  15 #define NDEBUG
  16 #include <internal/debug.h>
  17
  18 VOID
  19 FASTCALL
  20 KeRosTrapReturn ( PKTRAP_FRAME TrapFrame, PKTRAP_FRAME PrevTrapFrame );
  21
  22 VOID STDCALL
  23 KeRosDumpStackFrames ( PULONG Frame, ULONG FrameCount );
  24
  25 /*
  26  * @implemented
  27  */
  28 NTSTATUS STDCALL
  29 NtContinue (
  30         IN PCONTEXT Context,
  31         IN BOOLEAN TestAlert)
  32 {
  33         PKTRAP_FRAME TrapFrame = KeGetCurrentThread()->TrapFrame;
  34         PKTRAP_FRAME PrevTrapFrame = (PKTRAP_FRAME)TrapFrame->Edx;
  35         PFX_SAVE_AREA FxSaveArea;
  36         KIRQL oldIrql;
  37
  38         DPRINT("NtContinue: Context: Eip=0x%x, Esp=0x%x\n", Context->Eip, Context->Esp );
  39         PULONG Frame = 0;
  40         __asm__("mov %%ebp, %%ebx" : "=b" (Frame) : );
  41         DPRINT( "NtContinue(): Ebp=%x, prev/TF=%x/%x\n", Frame, Frame[0], TrapFrame );
  42 #ifndef NDEBUG
  43         KeRosDumpStackFrames(NULL,5);
  44 #endif
  45
  46         if ( Context == NULL )
  47         {
  48                 DPRINT1("NtContinue called with NULL Context\n");
  49                 return STATUS_INVALID_PARAMETER;
  50         }
  51
  52         if ( TrapFrame == NULL )
  53         {
  54                 CPRINT("NtContinue called but TrapFrame was NULL\n");
  55                 KEBUGCHECK(0);
  56         }
  57
  58         /*
  59          * Copy the supplied context over the register information that was saved
  60          * on entry to kernel mode, it will then be restored on exit
  61          * FIXME: Validate the context
  62          */
  63         KeContextToTrapFrame ( Context, TrapFrame );
  64
  65         /* Put the floating point context into the thread's FX_SAVE_AREA
  66          * and make sure it is reloaded when needed.
  67          */
  68         FxSaveArea = (PFX_SAVE_AREA)((ULONG_PTR)KeGetCurrentThread()->InitialStack - sizeof(FX_SAVE_AREA));
  69         if (KiContextToFxSaveArea(FxSaveArea, Context))
  70           {
  71             KeGetCurrentThread()->NpxState = NPX_STATE_VALID;
  72             KeRaiseIrql(DISPATCH_LEVEL, &oldIrql);
  73             if (KeGetCurrentKPCR()->PrcbData.NpxThread == KeGetCurrentThread())
  74               {
  75                 KeGetCurrentKPCR()->PrcbData.NpxThread = NULL;
  76                 Ke386SetCr0(Ke386GetCr0() | X86_CR0_TS);
  77               }
  78             else
  79               {
  80                 ASSERT((Ke386GetCr0() & X86_CR0_TS) == X86_CR0_TS);
  81               }
  82             KeLowerIrql(oldIrql);
  83           }
  84
  85         KeRosTrapReturn ( TrapFrame, PrevTrapFrame );
  86
  87         return STATUS_SUCCESS; /* this doesn't actually happen b/c KeRosTrapReturn() won't return */
  88 }