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). R.
