1#!/bin/sh
2# SPDX-License-Identifier: GPL-2.0
3# description: Kprobe events - probe points
4# requires: kprobe_events
5
6TARGET_FUNC=tracefs_create_dir
7
8dec_addr() { # hexaddr
9  printf "%d" "0x"`echo $1 | tail -c 8`
10}
11
12set_offs() { # prev target next
13  A1=`dec_addr $1`
14  A2=`dec_addr $2`
15  A3=`dec_addr $3`
16  TARGET="0x$2" # an address
17  PREV=`expr $A1 - $A2` # offset to previous symbol
18  NEXT=+`expr $A3 - $A2` # offset to next symbol
19  OVERFLOW=+`printf "0x%x" ${PREV}` # overflow offset to previous symbol
20}
21
22# We have to decode symbol addresses to get correct offsets.
23# If the offset is not an instruction boundary, it cause -EILSEQ.
24set_offs `grep -A1 -B1 ${TARGET_FUNC} /proc/kallsyms | cut -f 1 -d " " | xargs`
25
26UINT_TEST=no
27# printf "%x" -1 returns (unsigned long)-1.
28if [ `printf "%x" -1 | wc -c` != 9 ]; then
29  UINT_TEST=yes
30fi
31
32echo "p:testprobe ${TARGET_FUNC}" > kprobe_events
33echo "p:testprobe ${TARGET}" > kprobe_events
34echo "p:testprobe ${TARGET_FUNC}${NEXT}" > kprobe_events
35! echo "p:testprobe ${TARGET_FUNC}${PREV}" > kprobe_events
36if [ "${UINT_TEST}" = yes ]; then
37! echo "p:testprobe ${TARGET_FUNC}${OVERFLOW}" > kprobe_events
38fi
39