1#!/bin/sh 2# SPDX-License-Identifier: GPL-2.0 3# description: Kprobe event argument syntax 4# requires: kprobe_events "x8/16/32/64":README 5 6PROBEFUNC="vfs_read" 7GOODREG= 8BADREG= 9GOODSYM="_sdata" 10if ! grep -qw ${GOODSYM} /proc/kallsyms ; then 11 GOODSYM=$PROBEFUNC 12fi 13BADSYM="deaqswdefr" 14SYMADDR=0x`grep -w ${GOODSYM} /proc/kallsyms | cut -f 1 -d " "` 15GOODTYPE="x16" 16BADTYPE="y16" 17 18case `uname -m` in 19x86_64|i[3456]86) 20 GOODREG=%ax 21 BADREG=%ex 22;; 23aarch64) 24 GOODREG=%x0 25 BADREG=%ax 26;; 27arm*) 28 GOODREG=%r0 29 BADREG=%ax 30;; 31ppc*) 32 GOODREG=%r3 33 BADREG=%msr 34;; 35*) 36 echo "Please implement other architecture here" 37 exit_untested 38esac 39 40test_goodarg() # Good-args 41{ 42 while [ "$1" ]; do 43 echo "p ${PROBEFUNC} $1" > kprobe_events 44 shift 1 45 done; 46} 47 48test_badarg() # Bad-args 49{ 50 while [ "$1" ]; do 51 ! echo "p ${PROBEFUNC} $1" > kprobe_events 52 shift 1 53 done; 54} 55 56echo > kprobe_events 57 58: "Register access" 59test_goodarg ${GOODREG} 60test_badarg ${BADREG} 61 62: "Symbol access" 63test_goodarg "@${GOODSYM}" "@${SYMADDR}" "@${GOODSYM}+10" "@${GOODSYM}-10" 64test_badarg "@" "@${BADSYM}" "@${GOODSYM}*10" "@${GOODSYM}/10" \ 65 "@${GOODSYM}%10" "@${GOODSYM}&10" "@${GOODSYM}|10" 66 67: "Stack access" 68test_goodarg "\$stack" "\$stack0" "\$stack1" 69test_badarg "\$stackp" "\$stack0+10" "\$stack1-10" 70 71: "Retval access" 72echo "r ${PROBEFUNC} \$retval" > kprobe_events 73! echo "p ${PROBEFUNC} \$retval" > kprobe_events 74 75# $comm was introduced in 4.8, older kernels reject it. 76if grep -A1 "fetcharg:" README | grep -q '\$comm' ; then 77: "Comm access" 78test_goodarg "\$comm" 79fi 80 81: "Indirect memory access" 82test_goodarg "+0(${GOODREG})" "-0(${GOODREG})" "+10(\$stack)" \ 83 "+0(\$stack1)" "+10(@${GOODSYM}-10)" "+0(+10(+20(\$stack)))" 84test_badarg "+(${GOODREG})" "(${GOODREG}+10)" "-(${GOODREG})" "(${GOODREG})" \ 85 "+10(\$comm)" "+0(${GOODREG})+10" 86 87: "Name assignment" 88test_goodarg "varname=${GOODREG}" 89test_badarg "varname=varname2=${GOODREG}" 90 91: "Type syntax" 92test_goodarg "${GOODREG}:${GOODTYPE}" 93test_badarg "${GOODREG}::${GOODTYPE}" "${GOODREG}:${BADTYPE}" \ 94 "${GOODTYPE}:${GOODREG}" 95 96: "Combination check" 97 98test_goodarg "\$comm:string" "+0(\$stack):string" 99test_badarg "\$comm:x64" "\$stack:string" "${GOODREG}:string" 100