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#!/bin/sh
# SPDX-License-Identifier: GPL-2.0
# description: Kprobe event argument syntax
[ -f kprobe_events ] || exit_unsupported # this is configurable
grep "x8/16/32/64" README > /dev/null || exit_unsupported # version issue
echo 0 > events/enable
echo > kprobe_events
PROBEFUNC="vfs_read"
GOODREG=
BADREG=
GOODSYM="_sdata"
if ! grep -qw ${GOODSYM} /proc/kallsyms ; then
GOODSYM=$PROBEFUNC
fi
BADSYM="deaqswdefr"
SYMADDR=0x`grep -w ${GOODSYM} /proc/kallsyms | cut -f 1 -d " "`
GOODTYPE="x16"
BADTYPE="y16"
case `uname -m` in
x86_64|i[3456]86)
GOODREG=%ax
BADREG=%ex
;;
aarch64)
GOODREG=%x0
BADREG=%ax
;;
arm*)
GOODREG=%r0
BADREG=%ax
;;
ppc*)
GOODREG=%r3
BADREG=%msr
;;
*)
echo "Please implement other architecture here"
exit_untested
esac
test_goodarg() # Good-args
{
while [ "$1" ]; do
echo "p ${PROBEFUNC} $1" > kprobe_events
shift 1
done;
}
test_badarg() # Bad-args
{
while [ "$1" ]; do
! echo "p ${PROBEFUNC} $1" > kprobe_events
shift 1
done;
}
echo > kprobe_events
: "Register access"
test_goodarg ${GOODREG}
test_badarg ${BADREG}
: "Symbol access"
test_goodarg "@${GOODSYM}" "@${SYMADDR}" "@${GOODSYM}+10" "@${GOODSYM}-10"
test_badarg "@" "@${BADSYM}" "@${GOODSYM}*10" "@${GOODSYM}/10" \
"@${GOODSYM}%10" "@${GOODSYM}&10" "@${GOODSYM}|10"
: "Stack access"
test_goodarg "\$stack" "\$stack0" "\$stack1"
test_badarg "\$stackp" "\$stack0+10" "\$stack1-10"
: "Retval access"
echo "r ${PROBEFUNC} \$retval" > kprobe_events
! echo "p ${PROBEFUNC} \$retval" > kprobe_events
# $comm was introduced in 4.8, older kernels reject it.
if grep -A1 "fetcharg:" README | grep -q '\$comm' ; then
: "Comm access"
test_goodarg "\$comm"
fi
: "Indirect memory access"
test_goodarg "+0(${GOODREG})" "-0(${GOODREG})" "+10(\$stack)" \
"+0(\$stack1)" "+10(@${GOODSYM}-10)" "+0(+10(+20(\$stack)))"
test_badarg "+(${GOODREG})" "(${GOODREG}+10)" "-(${GOODREG})" "(${GOODREG})" \
"+10(\$comm)" "+0(${GOODREG})+10"
: "Name assignment"
test_goodarg "varname=${GOODREG}"
test_badarg "varname=varname2=${GOODREG}"
: "Type syntax"
test_goodarg "${GOODREG}:${GOODTYPE}"
test_badarg "${GOODREG}::${GOODTYPE}" "${GOODREG}:${BADTYPE}" \
"${GOODTYPE}:${GOODREG}"
: "Combination check"
test_goodarg "\$comm:string" "+0(\$stack):string"
test_badarg "\$comm:x64" "\$stack:string" "${GOODREG}:string"
echo > kprobe_events
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