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