40 lines
1.2 KiB
Plaintext
40 lines
1.2 KiB
Plaintext
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#!/bin/sh
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# SPDX-License-Identifier: GPL-2.0
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# description: Kprobe events - probe points
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[ -f kprobe_events ] || exit_unsupported # this is configurable
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TARGET_FUNC=tracefs_create_dir
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dec_addr() { # hexaddr
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printf "%d" "0x"`echo $1 | tail -c 8`
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}
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set_offs() { # prev target next
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A1=`dec_addr $1`
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A2=`dec_addr $2`
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A3=`dec_addr $3`
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TARGET="0x$2" # an address
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PREV=`expr $A1 - $A2` # offset to previous symbol
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NEXT=+`expr $A3 - $A2` # offset to next symbol
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OVERFLOW=+`printf "0x%x" ${PREV}` # overflow offset to previous symbol
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}
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# We have to decode symbol addresses to get correct offsets.
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# If the offset is not an instruction boundary, it cause -EILSEQ.
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set_offs `grep -A1 -B1 ${TARGET_FUNC} /proc/kallsyms | cut -f 1 -d " " | xargs`
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UINT_TEST=no
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# printf "%x" -1 returns (unsigned long)-1.
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if [ `printf "%x" -1 | wc -c` != 9 ]; then
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UINT_TEST=yes
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fi
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echo "p:testprobe ${TARGET_FUNC}" > kprobe_events
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echo "p:testprobe ${TARGET}" > kprobe_events
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echo "p:testprobe ${TARGET_FUNC}${NEXT}" > kprobe_events
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! echo "p:testprobe ${TARGET_FUNC}${PREV}" > kprobe_events
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if [ "${UINT_TEST}" = yes ]; then
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! echo "p:testprobe ${TARGET_FUNC}${OVERFLOW}" > kprobe_events
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fi
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