1#!/bin/sh
2# SPDX-License-Identifier: GPL-2.0
3# description: Kprobe events - probe points
4
5[ -f kprobe_events ] || exit_unsupported # this is configurable
6
7TARGET_FUNC=tracefs_create_dir
8
9dec_addr() { # hexaddr
10  printf "%d" "0x"`echo $1 | tail -c 8`
11}
12
13set_offs() { # prev target next
14  A1=`dec_addr $1`
15  A2=`dec_addr $2`
16  A3=`dec_addr $3`
17  TARGET="0x$2" # an address
18  PREV=`expr $A1 - $A2` # offset to previous symbol
19  NEXT=+`expr $A3 - $A2` # offset to next symbol
20  OVERFLOW=+`printf "0x%x" ${PREV}` # overflow offset to previous symbol
21}
22
23# We have to decode symbol addresses to get correct offsets.
24# If the offset is not an instruction boundary, it cause -EILSEQ.
25set_offs `grep -A1 -B1 ${TARGET_FUNC} /proc/kallsyms | cut -f 1 -d " " | xargs`
26
27UINT_TEST=no
28# printf "%x" -1 returns (unsigned long)-1.
29if [ `printf "%x" -1 | wc -c` != 9 ]; then
30  UINT_TEST=yes
31fi
32
33echo "p:testprobe ${TARGET_FUNC}" > kprobe_events
34echo "p:testprobe ${TARGET}" > kprobe_events
35echo "p:testprobe ${TARGET_FUNC}${NEXT}" > kprobe_events
36! echo "p:testprobe ${TARGET_FUNC}${PREV}" > kprobe_events
37if [ "${UINT_TEST}" = yes ]; then
38! echo "p:testprobe ${TARGET_FUNC}${OVERFLOW}" > kprobe_events
39fi
40