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