reactos/lib/ntdll/csr/probe.c

   1 /* $Id: probe.c,v 1.2 2002/09/07 15:12:38 chorns Exp $
   2  *
   3  * COPYRIGHT:       See COPYING in the top level directory
   4  * PROJECT:         ReactOS kernel
   5  * FILE:            lib/ntdll/csr/probe.c
   6  * PURPOSE:         CSRSS address range access probing API
   7  * AUTHOR:          Eric Kohl
   8  * DATE:            2001-06-17
   9  */
  10
  11 #define NTOS_USER_MODE
  12 #include <ntos.h>
  13
  14 #define NDEBUG
  15 #include <debug.h>
  16
  17
  18 VOID STDCALL
  19 CsrProbeForRead(IN CONST PVOID Address,
  20                 IN ULONG Length,
  21                 IN ULONG Alignment)
  22 {
  23    PUCHAR Pointer;
  24    UCHAR Data;
  25
  26    if (Length == 0)
  27      return;
  28
  29    if ((ULONG)Address & (Alignment - 1))
  30      RtlRaiseStatus(STATUS_DATATYPE_MISALIGNMENT);
  31
  32    Pointer = (PUCHAR)Address;
  33    Data = *Pointer;
  34    Pointer = (PUCHAR)((ULONG)Address + Length -1);
  35    Data = *Pointer;
  36 }
  37
  38 VOID STDCALL
  39 CsrProbeForWrite(IN CONST PVOID Address,
  40                  IN ULONG Length,
  41                  IN ULONG Alignment)
  42 {
  43    PUCHAR Pointer;
  44    UCHAR Data;
  45
  46    if (Length == 0)
  47      return;
  48
  49    if ((ULONG)Address & (Alignment - 1))
  50      RtlRaiseStatus(STATUS_DATATYPE_MISALIGNMENT);
  51
  52 //   if (Address >= MmUserProbeAddress)
  53 //     RtlRaiseStatus(STATUS_ACCESS_VIOLATION);
  54
  55    Pointer = (PUCHAR)Address;
  56    Data = *Pointer;
  57    *Pointer = Data;
  58    Pointer = (PUCHAR)((ULONG)Address + Length -1);
  59    Data = *Pointer;
  60    *Pointer = Data;
  61 }
  62
  63 /* EOF */