On Thu, 22 Feb 2018 00:01:29 +0900 Masami Hiramatsu mhiramat@kernel.org wrote:
Add a testcase for symbol type with kprobe event. This tests good/bad syntax combinations and also the traced data. If the kernel doesn't support symbol type, it skips the test as UNSUPPORTED.
Signed-off-by: Masami Hiramatsu mhiramat@kernel.org
.../ftrace/test.d/kprobe/kprobe_args_symbol.tc | 73 ++++++++++++++++++++ 1 file changed, 73 insertions(+) create mode 100644 tools/testing/selftests/ftrace/test.d/kprobe/kprobe_args_symbol.tc
diff --git a/tools/testing/selftests/ftrace/test.d/kprobe/kprobe_args_symbol.tc b/tools/testing/selftests/ftrace/test.d/kprobe/kprobe_args_symbol.tc new file mode 100644 index 000000000000..a5820b175df5 --- /dev/null +++ b/tools/testing/selftests/ftrace/test.d/kprobe/kprobe_args_symbol.tc @@ -0,0 +1,73 @@ +#!/bin/sh +# SPDX-License-Identifier: GPL-2.0 +# description: Kprobe event argument symbol type
+[ -f kprobe_events ] || exit_unsupported # this is configurable
+grep -qe "type:.* symbol" README || exit_unsupported # version issue
+echo 0 > events/enable +echo > kprobe_events
+PROBEFUNC="vfs_read" +GOODREG= +BADREG= +GOODSYM="_sdata" +if ! grep -qw ${GOODSYM} /proc/kallsyms ; then
- GOODSYM=$PROBEFUNC
+fi
+case `uname -m` in +x86_64|i[3456]86)
- GOODREG=%ax
- BADREG=%ex
+;; +aarch64)
- GOODREG=%x0
- BADREG=%ax
+;; +arm*)
- GOODREG=%r0
- BADREG=%ax
+;; +*)
- echo "Please implement other architecture here"
- exit_untested
+esac
+test_goodarg() # Good-args +{
- while [ "$1" ]; do
- echo "p ${PROBEFUNC} $1" > kprobe_events
- shift 1
- done;
+}
+test_badarg() # Bad-args +{
- while [ "$1" ]; do
- ! echo "p ${PROBEFUNC} $1" > kprobe_events
- shift 1
- done;
+}
+echo > kprobe_events
+: "Symbol type" +test_goodarg "${GOODREG}:symbol" "@${GOODSYM}:symbol" "@${GOODSYM}+10:symbol" \
"\$stack0:symbol" "+0(\$stack):symbol"+test_badarg "$comm:symbol"
+: "Retval with symbol type" +echo "r ${PROBEFUNC} $retval:symbol" > kprobe_events
+echo > kprobe_events
+: "Test get symbol" +echo 'p:testprobe create_trace_kprobe $stack0:symbol' > kprobe_events +echo 1 > events/kprobes/testprobe/enable +! echo test >> kprobe_events +tail -n 1 trace | grep -q "arg1=trace_run_command"
Hmm, this works only on x86 and other arch which stores return address on top of stack. I'll find some other good point to test it.
Thanks,
+echo 0 > events/enable +echo > kprobe_events