[PATCH v2 15/32] selftests/ftrace: Test kprobe-event argument with various bitsize

From: Masami Hiramatsu
Date: Thu Aug 16 2018 - 12:36:48 EST


Improve the kprobe-event with argument types testcase
to test it with various bitsize.
kprobe-event argument can be recorded in given types with
various bitsize (8, 16, 32, 64), thus the type testcase
should test the different bitsize too.

Signed-off-by: Masami Hiramatsu <mhiramat@xxxxxxxxxx>
---
.../ftrace/test.d/kprobe/kprobe_args_type.tc | 48 +++++++++++++-------
1 file changed, 32 insertions(+), 16 deletions(-)

diff --git a/tools/testing/selftests/ftrace/test.d/kprobe/kprobe_args_type.tc b/tools/testing/selftests/ftrace/test.d/kprobe/kprobe_args_type.tc
index 37443dd23d15..1bcb67dcae26 100644
--- a/tools/testing/selftests/ftrace/test.d/kprobe/kprobe_args_type.tc
+++ b/tools/testing/selftests/ftrace/test.d/kprobe/kprobe_args_type.tc
@@ -6,29 +6,45 @@

grep "x8/16/32/64" README > /dev/null || exit_unsupported # version issue

-echo 'p:testprobe _do_fork $stack0:s32 $stack0:u32 $stack0:x32 $stack0:b8@4/32' > kprobe_events
-grep testprobe kprobe_events
-test -d events/kprobes/testprobe
-
-echo 1 > events/kprobes/testprobe/enable
-( echo "forked")
-echo 0 > events/kprobes/testprobe/enable
-ARGS=`tail -n 1 trace | sed -e 's/.* arg1=\(.*\) arg2=\(.*\) arg3=\(.*\) arg4=\(.*\)/\1 \2 \3 \4/'`
+gen_event() { # Bitsize
+ echo "p:testprobe _do_fork \$stack0:s$1 \$stack0:u$1 \$stack0:x$1 \$stack0:b4@4/$1"
+}

-check_types() {
- X1=`printf "%x" $1 | tail -c 8`
+check_types() { # s-type u-type x-type bf-type width
+ test $# -eq 5
+ CW=$5
+ CW=$((CW / 4))
+ X1=`printf "%x" $1 | tail -c ${CW}`
X2=`printf "%x" $2`
X3=`printf "%x" $3`
test $X1 = $X2
test $X2 = $X3
test 0x$X3 = $3

- B4=`printf "%02x" $4`
- B3=`echo -n $X3 | tail -c 3 | head -c 2`
+ B4=`printf "%1x" $4`
+ B3=`printf "%03x" 0x$X3 | tail -c 2 | head -c 1`
test $B3 = $B4
}
-check_types $ARGS

-echo "-:testprobe" >> kprobe_events
-clear_trace
-test -d events/kprobes/testprobe && exit_fail || exit_pass
+for width in 64 32 16 8; do
+ : "Add new event with basic types"
+ gen_event $width > kprobe_events
+ grep testprobe kprobe_events
+ test -d events/kprobes/testprobe
+
+ : "Trace the event"
+ echo 1 > events/kprobes/testprobe/enable
+ ( echo "forked")
+ echo 0 > events/kprobes/testprobe/enable
+
+ : "Confirm the arguments is recorded in given types correctly"
+ ARGS=`grep "testprobe" trace | sed -e 's/.* arg1=\(.*\) arg2=\(.*\) arg3=\(.*\) arg4=\(.*\)/\1 \2 \3 \4/'`
+ check_types $ARGS $width
+
+ : "Clear event for next loop"
+ echo "-:testprobe" >> kprobe_events
+ clear_trace
+
+done
+
+exit_pass