[PATCH] arm: boot/compressed: fix decompressor header layout for v7-M

[Dave Martin]

On Fri, May 19, 2017 at 05:59:47PM +0100, Ard Biesheuvel wrote:
> On 19 May 2017 at 17:46, Dave Martin <Dave.Martin at arm.com> wrote:

[...]

> > Spelling it out might be more readable:
> >
> >    ARM(                 mov     r0, r0          )
> >    ARM(                 mov     r0, r0          )
> >
> >  THUMB( AR_CLASS(       sub     pc, pc, #3      ))
> >  THUMB( M_CLASS(        nop.w                   ))
> >  THUMB(                 .thumb                  )
> >  THUMB(                 b.w     1f              )
> >
> > But I guess it works either way.
> >
> 
> Indeed. Apart from the error in the second line, this sequence should
> be equivalent, but the nested macro invocations don't make it clearer
> imo.

Err, yes.  Actually I means to write

	b	1f
	mov	r0, r0

(since executing that nop before branching is presumably pointless).

Cheers
---Dave