Mon Jul 5 11:34:00 GMT 1999
On Fri, Jul 02, 1999 at 10:11:28PM -0700, Scott Howard wrote:
> Try this:
> asm (" ori.l %1,%0" : "=m" (EZ328_IMR) : "i" (EZ328_INT_UART));
OK - I also had this problem (also on a M68k), only a bit more difficult: I
have a structure which maps to some UART hardware registers. Now, I want do
static inline void txint_off(UART *regs)
regs->ier &= ~TXLDL_IE; /* not atomic :-( */
asm volatile ("bclr.b #1,1(%0)"
: : "a" (regs) : "cc");
The first does not procude atomic code. However, the asm is not very
maintainable, too: I would like to specify "®s->ier" somehow so that I do
not have to hardcode the offset for the address register in the asm code,
but I could not get this to work - all constraints produced some kind of
invalid asm code, because the '1' may *not* be prefixed by a '#'.
Best would be to somehow make gcc produce atomic code in the first place,
but a working asm without hardcoded offsets would be fine, too.
Michael Schwingen, Ahornstrasse 36, 52074 Aachen
New CrossGCC FAQ: http://www.objsw.com/CrossGCC
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