#!/bin/sh
# SPDX-License-Identifier: GPL-2.0
# description: Register/unregister many kprobe events

[ -f kprobe_events ] || exit_unsupported # this is configurable

# ftrace fentry skip size depends on the machine architecture.
# Currently HAVE_KPROBES_ON_FTRACE defined on x86 and powerpc64le
case `uname -m` in
  x86_64|i[3456]86) OFFS=5;;
  ppc64le) OFFS=8;;
  *) OFFS=0;;
esac

if [ -d events/kprobes ]; then
  echo 0 > events/kprobes/enable
  echo > kprobe_events
fi

N=0
echo "Setup up kprobes on first available 256 text symbols"
grep -i " t " /proc/kallsyms | cut -f3 -d" " | grep -v .*\\..* | \
while read i; do
  echo p ${i}+${OFFS} >> kprobe_events && N=$((N+1)) ||:
  test $N -eq 256 && break
done

L=`cat kprobe_events | wc -l`
if [ $L -ne 256 ]; then
  echo "The number of kprobes events ($L) is not 256"
  exit_fail
fi

echo 1 > events/kprobes/enable
echo 0 > events/kprobes/enable
echo > kprobe_events
echo "Waiting for unoptimizing & freeing"
sleep 5
echo "Done"