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

   1 #!/bin/sh
   2 # SPDX-License-Identifier: GPL-2.0
   3 # description: Kprobe events - probe points
   4
   5 [ -f kprobe_events ] || exit_unsupported # this is configurable
   6
   7 TARGET_FUNC=tracefs_create_dir
   8
   9 dec_addr() { # hexaddr
  10   printf "%d" "0x"`echo $1 | tail -c 8`
  11 }
  12
  13 set_offs() { # prev target next
  14   A1=`dec_addr $1`
  15   A2=`dec_addr $2`
  16   A3=`dec_addr $3`
  17   TARGET="0x$2" # an address
  18   PREV=`expr $A1 - $A2` # offset to previous symbol
  19   NEXT=+`expr $A3 - $A2` # offset to next symbol
  20   OVERFLOW=+`printf "0x%x" ${PREV}` # overflow offset to previous symbol
  21 }
  22
  23 # We have to decode symbol addresses to get correct offsets.
  24 # If the offset is not an instruction boundary, it cause -EILSEQ.
  25 set_offs `grep -A1 -B1 ${TARGET_FUNC} /proc/kallsyms | cut -f 1 -d " " | xargs`
  26
  27 UINT_TEST=no
  28 # printf "%x" -1 returns (unsigned long)-1.
  29 if [ `printf "%x" -1 | wc -c` != 9 ]; then
  30   UINT_TEST=yes
  31 fi
  32
  33 echo "p:testprobe ${TARGET_FUNC}" > kprobe_events
  34 echo "p:testprobe ${TARGET}" > kprobe_events
  35 echo "p:testprobe ${TARGET_FUNC}${NEXT}" > kprobe_events
  36 ! echo "p:testprobe ${TARGET_FUNC}${PREV}" > kprobe_events
  37 if [ "${UINT_TEST}" = yes ]; then
  38 ! echo "p:testprobe ${TARGET_FUNC}${OVERFLOW}" > kprobe_events
  39 fi