reactos/lib/sdk/crt/except/stack.c

   1 #include <precomp.h>
   2
   3 /*********************************************************************
   4 *              _chkesp (MSVCRT.@)
   5 *
   6 * Trap to a debugger if the value of the stack pointer has changed.
   7 *
   8 * PARAMS
   9 *  None.
  10 *
  11 * RETURNS
  12 *  Does not return.
  13 *
  14 * NOTES
  15 *  This function is available for iX86 only.
  16 *
  17 *  When VC++ generates debug code, it stores the value of the stack pointer
  18 *  before calling any external function, and checks the value following
  19 *  the call. It then calls this function, which will trap if the values are
  20 *  not the same. Usually this means that the prototype used to call
  21 *  the function is incorrect.  It can also mean that the .spec entry has
  22 *  the wrong calling convention or parameters.
  23 */
  24
  25 #ifdef __i386__
  26
  27 void _chkesp_failed(void)
  28 {
  29     ERR("stack got corrupted!\n");
  30     __debugbreak();
  31 }
  32
  33 #endif  /* __i386__ */
  34
  35 /*********************************************************************
  36  * _resetstkoflw (MSVCRT.@)
  37  */
  38 int CDECL _resetstkoflw(void)
  39 {
  40     int stack_addr;
  41
  42     /* causes stack fault that updates NtCurrentTeb()->Tib.StackLimit */
  43     return VirtualProtect( &stack_addr, 1, PAGE_GUARD|PAGE_READWRITE, NULL );
  44 }