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