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#!/bin/sh
# SPDX-License-Identifier: GPL-2.0
# description: Kprobe events - probe points
[ -f kprobe_events ] || exit_unsupported # this is configurable
TARGET_FUNC=tracefs_create_dir
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 "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
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