Linux kernel mirror (for testing)
git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git
tjh.dev
kernel
os
linux
selftests: ftrace: Add a testcase for probepoint
Add a testcase for probe point definition. This tests
symbol, address and symbol+offset syntax. The offset
must be positive and smaller than UINT_MAX.
Link: http://lkml.kernel.org/r/152129043097.31874.14273580606301767394.stgit@devbox
Signed-off-by: Masami Hiramatsu <mhiramat@kernel.org>
Signed-off-by: Steven Rostedt (VMware) <rostedt@goodmis.org>
authored by Masami Hiramatsu and committed by Steven Rostedt (VMware) dfa453bc 5fbdbed7
+43
tools/testing/selftests/ftrace/test.d/kprobe/probepoint.tc
+43
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=create_trace_kprobe
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 0 > events/enable
34
+
echo > kprobe_events
35
+
echo "p:testprobe ${TARGET_FUNC}" > kprobe_events
36
+
echo "p:testprobe ${TARGET}" > kprobe_events
37
+
echo "p:testprobe ${TARGET_FUNC}${NEXT}" > kprobe_events
38
+
! echo "p:testprobe ${TARGET_FUNC}${PREV}" > kprobe_events
39
+
if [ "${UINT_TEST}" = yes ]; then
40
+
! echo "p:testprobe ${TARGET_FUNC}${OVERFLOW}" > kprobe_events
41
+
fi
42
+
echo > kprobe_events
43
+
clear_trace