1 #!/bin/sh
2 # SPDX-License-Identifier: GPL-2.0
3 # description: Kprobe events - probe points
4 # requires: kprobe_events
5
6 TARGET_FUNC=tracefs_create_dir
7
8 dec_addr() { # hexaddr
9 printf "%d" "0x"`echo $1 | tail -c 8`
10 }
11
12 set_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.
24 set_offs `grep -v __pfx_ /proc/kallsyms | grep -A1 -B1 ${TARGET_FUNC} | cut -f 1 -d " " | xargs`
25
26 UINT_TEST=no
27 # printf "%x" -1 returns (unsigned long)-1.
28 if [ `printf "%x" -1 | wc -c` != 9 ]; then
29 UINT_TEST=yes
30 fi
31
32 echo "p:testprobe ${TARGET_FUNC}" > kprobe_events
33 echo "p:testprobe ${TARGET}" > kprobe_events
34 echo "p:testprobe ${TARGET_FUNC}${NEXT}" > kprobe_events
35 ! echo "p:testprobe ${TARGET_FUNC}${PREV}" > kprobe_events
36 if [ "${UINT_TEST}" = yes ]; then
37 ! echo "p:testprobe ${TARGET_FUNC}${OVERFLOW}" > kprobe_events
38 fi
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