loody wrote:
> 2009/1/29 Jamie Lokier <jamie@xxxxxxxxxxxxx>:
> > loody wrote:
> >> e1a0e00f mov lr, pc
> >> e12fff13 bx r3
>
> Actually my cpu get exception when executing this instruction not bx r3.
> But lr is the destination for cpu to write, I have checked the arm
> reference and it doesn't say any cautions when the destination is lr.
You're right, that doesn't make sense to me either.
> > "bx" is not available on all ARMs, and will fault when you don't have
> > it. That's why it's necessary to build everything with the right GCC
> > options.
>
> There are bx instructions generated when I use arm-linux-2006.
>
> BTW, can I take off the Thumb support in my compiler options?
> Thumb is only used for decreasing the density of source code and so
> far I just want my kernel say hello to me.
At this point, you may want to subscribe to the linux-arm mailing
list, and ask the question again there :-)
http://lists.arm.linux.org.uk/mailman/listinfo/linux-arm
-- Jamie
