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| author | Guo Ren <ren_guo@c-sky.com> | 2019-03-01 08:50:36 +0800 |
|---|---|---|
| committer | Guo Ren <ren_guo@c-sky.com> | 2019-04-22 13:44:57 +0800 |
| commit | 28bb030f93334495ddc64ade0bff18721bf7023d (patch) | |
| tree | d0a4e4eaa36575adf490165f63d2bd6160653124 /arch/csky/abiv1 | |
| parent | 3dfc242f11d792535db774613c6fd1df565c2137 (diff) | |
| download | linux-28bb030f93334495ddc64ade0bff18721bf7023d.tar.bz2 | |
csky/ftrace: Add dynamic function tracer (include graph tracer)
Support dynamic ftrace including dynamic graph tracer. Gcc-csky with -pg
will produce call site in every function prologue and we can use these
call site to hook trace function.
gcc with -pg origin call site:
push lr
jbsr _mcount
nop32
nop32
If the (callee - caller)'s offset is in range of bsr instruction, we'll
modify code with:
push lr
bsr _mcount
nop32
nop32
Else if the (callee - caller)'s offset is out of bsr instrunction, we'll
modify code with:
push lr
movih r26, ...
ori r26, ...
jsr r26
(r26 is reserved for jsr link reg in csky abiv2 spec.)
Signed-off-by: Guo Ren <ren_guo@c-sky.com>
Diffstat (limited to 'arch/csky/abiv1')
0 files changed, 0 insertions, 0 deletions