void
ao_yield(void) _naked
{
- static uint8_t __data stack_len;
- static __data uint8_t * __data stack_ptr;
- static __xdata uint8_t * __data save_ptr;
/* Save current context */
_asm
if (ao_cur_task_index != AO_NO_TASK_INDEX)
{
+ uint8_t stack_len;
+ __data uint8_t * stack_ptr;
+ __xdata uint8_t * save_ptr;
/* Save the current stack */
stack_len = SP - (AO_STACK_START - 1);
ao_cur_task->stack_count = stack_len;
stack_ptr = (uint8_t __data *) AO_STACK_START;
save_ptr = (uint8_t __xdata *) ao_cur_task->stack;
- while (stack_len--)
+ do
*save_ptr++ = *stack_ptr++;
+ while (--stack_len);
}
/* Empty the stack; might as well let interrupts have the whole thing */
break;
}
- /* Restore the old stack */
- stack_len = ao_cur_task->stack_count;
- SP = AO_STACK_START - 1 + stack_len;
+ {
+ uint8_t stack_len;
+ __data uint8_t * stack_ptr;
+ __xdata uint8_t * save_ptr;
- stack_ptr = (uint8_t __data *) AO_STACK_START;
- save_ptr = (uint8_t __xdata *) ao_cur_task->stack;
- while (stack_len--)
- *stack_ptr++ = *save_ptr++;
+ /* Restore the old stack */
+ stack_len = ao_cur_task->stack_count;
+ SP = AO_STACK_START - 1 + stack_len;
+
+ stack_ptr = (uint8_t __data *) AO_STACK_START;
+ save_ptr = (uint8_t __xdata *) ao_cur_task->stack;
+ do
+ *stack_ptr++ = *save_ptr++;
+ while (--stack_len);
+ }
_asm
pop _bp