tools/testing/selftests/ftrace/test.d/kprobe/kprobe_args_syntax.tc

   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
   6 PROBEFUNC="vfs_read"
   7 GOODREG=
   8 BADREG=
   9 GOODSYM="_sdata"
  10 if ! grep -qw ${GOODSYM} /proc/kallsyms ; then
  11   GOODSYM=$PROBEFUNC
  12 fi
  13 BADSYM="deaqswdefr"
  14 SYMADDR=0x`grep -w ${GOODSYM} /proc/kallsyms | cut -f 1 -d " "`
  15 GOODTYPE="x16"
  16 BADTYPE="y16"
  17
  18 case `uname -m` in
  19 x86_64|i[3456]86)
  20   GOODREG=%ax
  21   BADREG=%ex
  22 ;;
  23 aarch64)
  24   GOODREG=%x0
  25   BADREG=%ax
  26 ;;
  27 arm*)
  28   GOODREG=%r0
  29   BADREG=%ax
  30 ;;
  31 ppc*)
  32   GOODREG=%r3
  33   BADREG=%msr
  34 ;;
  35 s390*)
  36   GOODREG=%r2
  37   BADREG=%s2
  38 ;;
  39 mips*)
  40   GOODREG=%r4
  41   BADREG=%r12
  42 ;;
  43 loongarch*)
  44   GOODREG=%r4
  45   BADREG=%r12
  46 ;;
  47 riscv*)
  48   GOODREG=%a0
  49   BADREG=%a8
  50 ;;
  51 *)
  52   echo "Please implement other architecture here"
  53   exit_untested
  54 esac
  55
  56 test_goodarg() # Good-args
  57 {
  58   while [ "$1" ]; do
  59     echo "p ${PROBEFUNC} $1" > kprobe_events
  60     shift 1
  61   done;
  62 }
  63
  64 test_badarg() # Bad-args
  65 {
  66   while [ "$1" ]; do
  67     ! echo "p ${PROBEFUNC} $1" > kprobe_events
  68     shift 1
  69   done;
  70 }
  71
  72 echo > kprobe_events
  73
  74 : "Register access"
  75 test_goodarg ${GOODREG}
  76 test_badarg ${BADREG}
  77
  78 : "Symbol access"
  79 test_goodarg "@${GOODSYM}" "@${SYMADDR}" "@${GOODSYM}+10" "@${GOODSYM}-10"
  80 test_badarg "@" "@${BADSYM}" "@${GOODSYM}*10" "@${GOODSYM}/10" \
  81             "@${GOODSYM}%10" "@${GOODSYM}&10" "@${GOODSYM}|10"
  82
  83 : "Stack access"
  84 test_goodarg "\$stack" "\$stack0" "\$stack1"
  85 test_badarg "\$stackp" "\$stack0+10" "\$stack1-10"
  86
  87 : "Retval access"
  88 echo "r ${PROBEFUNC} \$retval" > kprobe_events
  89 ! echo "p ${PROBEFUNC} \$retval" > kprobe_events
  90
  91 # $comm was introduced in 4.8, older kernels reject it.
  92 if grep -A1 "fetcharg:" README | grep -q '\$comm' ; then
  93 : "Comm access"
  94 test_goodarg "\$comm"
  95 fi
  96
  97 : "Indirect memory access"
  98 test_goodarg "+0(${GOODREG})" "-0(${GOODREG})" "+10(\$stack)" \
  99         "+0(\$stack1)" "+10(@${GOODSYM}-10)" "+0(+10(+20(\$stack)))"
 100 test_badarg "+(${GOODREG})" "(${GOODREG}+10)" "-(${GOODREG})" "(${GOODREG})" \
 101         "+10(\$comm)" "+0(${GOODREG})+10"
 102
 103 : "Name assignment"
 104 test_goodarg "varname=${GOODREG}"
 105 test_badarg "varname=varname2=${GOODREG}"
 106
 107 : "Type syntax"
 108 test_goodarg "${GOODREG}:${GOODTYPE}"
 109 test_badarg "${GOODREG}::${GOODTYPE}" "${GOODREG}:${BADTYPE}" \
 110         "${GOODTYPE}:${GOODREG}"
 111
 112 : "Combination check"
 113
 114 test_goodarg "\$comm:string" "+0(\$stack):string"
 115 test_badarg "\$comm:x64" "\$stack:string" "${GOODREG}:string"