On Tue, Dec 03, 2013 at 06:37:33AM +0100, Vladimir 'φ-coder/phcoder' Serbinenko
wrote:
> > No, BLX immediate has been supported since ARMv5T.
> > (Yes, that is effectively a 32-bit encoding in what is a 16-bit
> > instruction set - but so is the basic BL.)
> >
> I've looked through encoding of those instructions and see how much it's
> a mess. b* and b*x don't have similar set of options which makes
> validating them a difficult error-prone task. So I think, I'll just add
> veneers to mkimage, just like we do on ia64 (either by making a
> pc-relative variant of veneers or adding fixup for them)
Not B, BL.
There is a 1-bit range difference between Thumb BL and BLX, which we
need to check for anyway. This check already exists (and must exist) in
the code. Adding veneers would be pure overhead.
/
Leif
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