stack.c

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#include <precomp.h>
 
/*********************************************************************
*              _chkesp (MSVCRT.@)
*
* Trap to a debugger if the value of the stack pointer has changed.
*
* PARAMS
*  None.
*
* RETURNS
*  Does not return.
*
* NOTES
*  This function is available for iX86 only.
*
*  When VC++ generates debug code, it stores the value of the stack pointer
*  before calling any external function, and checks the value following
*  the call. It then calls this function, which will trap if the values are
*  not the same. Usually this means that the prototype used to call
*  the function is incorrect.  It can also mean that the .spec entry has
*  the wrong calling convention or parameters.
*/
 
#ifdef __i386__
 
void _chkesp_failed(void)
{
    ERR("stack got corrupted!\n");
    __debugbreak();
}
 
#endif  /* __i386__ */
 
/*********************************************************************
 * _resetstkoflw (MSVCRT.@)
 */
int CDECL _resetstkoflw(void)
{
    int stack_addr;
    DWORD oldprot;
 
    /* causes stack fault that updates NtCurrentTeb()->Tib.StackLimit */
    return VirtualProtect(&stack_addr, 1, PAGE_GUARD|PAGE_READWRITE, &oldprot);
}