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;; 35s390*) 36 GOODREG=%r2 37 BADREG=%s2 38;; 39mips*) 40 GOODREG=%r4 41 BADREG=%r12 42;; 43loongarch*) 44 GOODREG=%r4 45 BADREG=%r12 46;; 47riscv*) 48 GOODREG=%a0 49 BADREG=%a8 50;; 51*) 52 echo "Please implement other architecture here" 53 exit_untested 54esac 55 56test_goodarg() # Good-args 57{ 58 while [ "$1" ]; do 59 echo "p ${PROBEFUNC} $1" > kprobe_events 60 shift 1 61 done; 62} 63 64test_badarg() # Bad-args 65{ 66 while [ "$1" ]; do 67 ! echo "p ${PROBEFUNC} $1" > kprobe_events 68 shift 1 69 done; 70} 71 72echo > kprobe_events 73 74: "Register access" 75test_goodarg ${GOODREG} 76test_badarg ${BADREG} 77 78: "Symbol access" 79test_goodarg "@${GOODSYM}" "@${SYMADDR}" "@${GOODSYM}+10" "@${GOODSYM}-10" 80test_badarg "@" "@${BADSYM}" "@${GOODSYM}*10" "@${GOODSYM}/10" \ 81 "@${GOODSYM}%10" "@${GOODSYM}&10" "@${GOODSYM}|10" 82 83: "Stack access" 84test_goodarg "\$stack" "\$stack0" "\$stack1" 85test_badarg "\$stackp" "\$stack0+10" "\$stack1-10" 86 87: "Retval access" 88echo "r ${PROBEFUNC} \$retval" > kprobe_events 89! echo "p ${PROBEFUNC} \$retval" > kprobe_events 90 91# $comm was introduced in 4.8, older kernels reject it. 92if grep -A1 "fetcharg:" README | grep -q '\$comm' ; then 93: "Comm access" 94test_goodarg "\$comm" 95fi 96 97: "Indirect memory access" 98test_goodarg "+0(${GOODREG})" "-0(${GOODREG})" "+10(\$stack)" \ 99 "+0(\$stack1)" "+10(@${GOODSYM}-10)" "+0(+10(+20(\$stack)))" 100test_badarg "+(${GOODREG})" "(${GOODREG}+10)" "-(${GOODREG})" "(${GOODREG})" \ 101 "+10(\$comm)" "+0(${GOODREG})+10" 102 103: "Name assignment" 104test_goodarg "varname=${GOODREG}" 105test_badarg "varname=varname2=${GOODREG}" 106 107: "Type syntax" 108test_goodarg "${GOODREG}:${GOODTYPE}" 109test_badarg "${GOODREG}::${GOODTYPE}" "${GOODREG}:${BADTYPE}" \ 110 "${GOODTYPE}:${GOODREG}" 111 112: "Combination check" 113 114test_goodarg "\$comm:string" "+0(\$stack):string" 115test_badarg "\$comm:x64" "\$stack:string" "${GOODREG}:string" 116