[uClinux-dev] why no-mmu cannot support binfmt_aout.c

[Jamie Lokier]

loody wrote:
> 2009/1/29 Jamie Lokier <jamie@shareable.org>:
> > 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