Division by zero in _exit of libnosys

[Jie Zhang]

On 2/10/07, Jie Zhang <jzhang918@gmail.com> wrote:
> We have to find another way to do that. How about the below method?
>
> #ifdef __BFIN__
>   asm ("excpt 0;");
> #else
>   /* Default stub just causes a divide by 0 exception.  */
>   int x = rc / INT_MAX;
>   x = 4 / x;
> #endif
>
Paolo suggested using an asm to prevent gcc from optimizing away the
division by zero:

http://gcc.gnu.org/ml/gcc/2007-02/msg00200.html

So the above code snippet now looks like:
#ifdef __BFIN__
  asm ("excpt 0;");
#else
  /* Default stub just causes a divide by 0 exception.  */
  int x = rc / INT_MAX;
  x = 4 / x;
  asm volatile ("" : : "r" (x));
#endif


Jie