selftests/ftrace: Test kprobe-event argument with various bitsize

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

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

test -d events/kprobes/testprobe && exit_fail || exit_pass

done

exit_pass