On Fri, Jun 02, 2006 at 04:32:07PM +0100, Richard Earnshaw wrote: > On Fri, 2006-06-02 at 16:28, Paul Brook wrote: > > I agree that in general you need ancillary information way to get a > > backtrace > > on Arm. However if you assume only Arm code code and > > -fno-omit-frame-pointer > > then you can walk the frames. Given this assumption I think it make sense > > to > > have _b_f_a(0) force the use of a frame pointer. > > > > No, in the general case you can't. Because ARM and Thumb frames are > laid out differently. In ARM code the frame pointer is in r11 (when not > eliminated); in thumb code it is in r7 (because r11 can't be used in > memory insns).
I'm reading these two paragraphs and the two of you seem to be in violent agreement. Paul assumed ARM code only. -- Daniel Jacobowitz CodeSourcery
