Re: [avr-gcc-list] incorrect function prolog/epilog?

[Paulo Marques]

Michal Grégr wrote:
> [...]
> I think it should restore SREG after both SPH and SPL is updated,
> otherwise an incorrect stack is used if an interrupt occurs between SPH
> and SPL write. Or am I wrong?

This is starting to be a FAQ ;)

Even if there are interrupts pending, the AVR will always execute _one_ 
more instruction after enabling interrupts before jumping to the 
interrupt vector, so that code is safe.

Search the archives for "problem with stack" from June for a similar thread.

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Paulo Marques
Software Development Department - Grupo PIE, S.A.
Phone: +351 252 290600, Fax: +351 252 290601
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