Endian problem when accessing internel regs on 8347

Scott Wood scottwood at freescale.com
Fri Jan 18 09:18:42 EST 2008

Bruce_Leonard at selinc.com wrote:
>>> __asm__ __volatile__("lwz%U1%X1 %0,%1; twi 0,%0,0; isync" : "=r" (ret) 
> : 
>>> "m" (*addr));
>> They allow the compiler to use update and/or index mode for the memory 
>> operand.
> Well that makes sense, U for update and X for index, but I'm not sure 
> they're applicable to this particular instruction and I'm not sure that 
> the memory operand makes sense for PowerPC.

Why not?

> However, before I post 
> anything that makes me look like I've got hoof-n-mouth disease I'm going 
> to do some more digging.  Is the GCC manual the only "official" 
> documentation on this (I've found a couple of web sites but none of them 
> gun.org)

I believe so... other than the sources, of course. :-)


More information about the Linuxppc-embedded mailing list