Completely off-topic, but...
On Fri, Aug 19, 2016 at 07:21:44PM +0200, Laurent Dufour wrote:
> asm __volatile__(
> "li 3,1 ;"
> "tbegin. ;"
> "beq 1f ;"
> "li 3,0 ;"
> "tsuspend. ;"
> "1: ;"
> "std 3, %[ret] ;"
> : [ret]"=m"(ret)
> :
> : "memory", "3");
This asm clobbers CR0, so you should add a "cc" or "cr0" clobber here.
When you use "m" you need "%X" as well, i.e.
std%X[ret] 3,%[ret]
(Nowadays you only need "%U" if you use "m<>", but you still need "%X".
Come to think of it, the kernel supports really old GCC, right? So you
need "std%U[ret]%X[ret] 3,%[ret]").
> asm __volatile__(
> "tbegin. ;"
> "beq 1f ;"
> "li 3,0 ;"
> "std 3,0(3) ;" /* Oups ! */
> "1: ;"
> "tend. ;"
> );
Here "cc" (or "cr0"), too.
Segher
