On 01.03.2012 16:30, David Kelly wrote:
>
> On Mar 1, 2012, at 9:10 AM, Richard Zetterberg wrote:
>
>> int main(void)
>> {
>> DDRB |= (1 << PB0);
>> 84: 20 9a sbi 0x04, 0 ; 4
>> turn_on_pb();
>> 86: 0e 94 40 00 call 0x80 ; 0x80 <turn_on_pb>
>> 8a: ff cf rjmp .-2 ; 0x8a <main+0x6>
>>
>> 0000008c <_exit>:
>> 8c: f8 94 cli
>>
>> 0000008e <__stop_program>:
>> 8e: ff cf rjmp .-2 ; 0x8e <__stop_program>
>
> Pardon me for tuning in late but since when did main() start ending with an
> "rjmp .-2" infinite loop as shown at 0x8a above? Is supposed to ret to caller
> which then calls _exit or perhaps calls something else. But my point is that
> int main() is a function that is supposed to return to caller.
Because his code looks like this:
int main(void)
{
DDRB |= (1 << PB0);
turn_on_pb();
for (;;) {
}
return 0;
}
The for(;;) is the interesting part ;-)
Best regards,
Joe
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