selftests: ftrace: Add a testcase for probepoint

#!/bin/sh

# SPDX-License-Identifier: GPL-2.0

# description: Kprobe events - probe points

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

TARGET_FUNC=create_trace_kprobe

dec_addr() { # hexaddr

  printf "%d" "0x"`echo $1 | tail -c 8`

}

set_offs() { # prev target next

  A1=`dec_addr $1`

  A2=`dec_addr $2`

  A3=`dec_addr $3`

  TARGET="0x$2" # an address

  PREV=`expr $A1 - $A2` # offset to previous symbol

  NEXT=+`expr $A3 - $A2` # offset to next symbol

  OVERFLOW=+`printf "0x%x" ${PREV}` # overflow offset to previous symbol

}

# We have to decode symbol addresses to get correct offsets.

# If the offset is not an instruction boundary, it cause -EILSEQ.

set_offs `grep -A1 -B1 ${TARGET_FUNC} /proc/kallsyms | cut -f 1 -d " " | xargs`

UINT_TEST=no

# printf "%x" -1 returns (unsigned long)-1.

if [ `printf "%x" -1 | wc -c` != 9 ]; then

  UINT_TEST=yes

fi

echo 0 > events/enable

echo > kprobe_events

echo "p:testprobe ${TARGET_FUNC}" > kprobe_events

echo "p:testprobe ${TARGET}" > kprobe_events

echo "p:testprobe ${TARGET_FUNC}${NEXT}" > kprobe_events

! echo "p:testprobe ${TARGET_FUNC}${PREV}" > kprobe_events

if [ "${UINT_TEST}" = yes ]; then

! echo "p:testprobe ${TARGET_FUNC}${OVERFLOW}" > kprobe_events

fi

echo > kprobe_events

clear_trace