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