coreboot-kgpe-d16

History

Rudolf Marek 8679e52b96 Add support utils for tracing Following patch adds a userspace util genprof which is able to convert the console printed traces to gmon.out file used by gprof & friends. The log2dress will replace the adresses in logfile with a line numbers. Change-Id: I9f716f3ff2522a24fbc844a1dd5e32ef49b540c5 Signed-off-by: Rudolf Marek <r.marek@assembler.cz> Reviewed-on: http://review.coreboot.org/179 Tested-by: build bot (Jenkins) Reviewed-by: Stefan Reinauer <stefan.reinauer@coreboot.org>		2011-09-07 01:27:57 +02:00
..
genprof.c	Add support utils for tracing	2011-09-07 01:27:57 +02:00
log2dress	Add support utils for tracing	2011-09-07 01:27:57 +02:00
Makefile	Add support utils for tracing	2011-09-07 01:27:57 +02:00
README	Add support utils for tracing	2011-09-07 01:27:57 +02:00

README

Function tracing
----------------

Enable CONFIG_TRACE in debug menu. Run the compiled image on target. You will get
a log with a lot of lines like:

...
~0x001072e8(0x00100099)
~0x00108bc0(0x0010730a)
...

First address is address of function which was just entered, the second address
is address of functions which call that.

You can use the log2dress to dress the log again:

...
src/arch/x86/lib/c_start.S:85 calls /home/ruik/coreboot/src/boot/selfboot.c:367
/home/ruik/coreboot/src/boot/selfboot.c:370 calls /home/ruik/coreboot/src/devices/device.c:325
...

Alternatively, you can use genprof to generate a gmon.out file, which can be used
by gprof to show the call traces. You will need to install uthash library to compile
that.

Great use is:

make
./genprof /tmp/yourlog ;  gprof ../../build/coreboot_ram |  ./gprof2dot.py -e0 -n0 | dot -Tpng -o output.png

Which generates a PNG with a call graph.