David Daney wrote: > Atsushi Nemoto wrote: > >Instead of dump all possible address in the stack, unwind the stack > >frame based on prologue code analysis, as like as get_chan() does. > >While the code analysis might fail for some reason, there is a new > >kernel option "raw_show_trace" to disable this feature. > > > >Signed-off-by: Atsushi Nemoto <anemo@xxxxxxxxxxxxx> > > Let me start by saying I have not analyzed how all this code works, but > I have done something similar in user space. > > Since the kernel ABI does not use gp, many functions may not have a > prolog (especially when compiled with newer versions of GCC). In the > user space case, most leaf functions have no prolog. For the kernel I > would imagine that many non-leaf functions (simple non-leaf functions > that do only a tail call) would also not have a prolog. Non-leaves have to save/restore $31 somewhere, so there should be a prologue. Thiemo
