Thiemo Seufer wrote:
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.
OK, good point.
But there is still the leaf function problem.
David Daney.
