[PATCH v6 04/21] selftests: ftrace: Add a testcase for probepoint

Masami Hiramatsu
2018-03-17T12:41:12Z

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.

Signed-off-by: Masami Hiramatsu <mhiramat@kernel.org>
---
.../selftests/ftrace/test.d/kprobe/probepoint.tc | 43 ++++++++++++++++++++
1 file changed, 43 insertions(+)
create mode 100644 tools/testing/selftests/ftrace/test.d/kprobe/probepoint.tc

diff --git a/tools/testing/selftests/ftrace/test.d/kprobe/probepoint.tc b/tools/testing/selftests/ftrace/test.d/kprobe/probepoint.tc
new file mode 100644
index 000000000000..4fda01a08da4
--- /dev/null
+++ b/tools/testing/selftests/ftrace/test.d/kprobe/probepoint.tc
@@ -0,0 +1,43 @@
+#!/bin/sh
+# SPDX-License-Identifier: GPL-2.0
+# description: Kprobe events - probe points
+
+[ -f kprobe_events ] || exit_unsupported # this is configurable
+
+TARGET_FUNC=create_trace_kprobe
+
+dec_addr() { # hexaddr
+ printf "%d" "0x"`echo $1 | tail -c 8`
+}
+
+set_offs() { # prev target next
+ A1=`dec_addr $1`
+ A2=`dec_addr $2`
+ A3=`dec_addr $3`
+ TARGET="0x$2" # an address
+ PREV=`expr $A1 - $A2` # offset to previous symbol
+ NEXT=+`expr $A3 - $A2` # offset to next symbol
+ OVERFLOW=+`printf "0x%x" ${PREV}` # overflow offset to previous symbol
+}
+
+# We have to decode symbol addresses to get correct offsets.
+# If the offset is not an instruction boundary, it cause -EILSEQ.
+set_offs `grep -A1 -B1 ${TARGET_FUNC} /proc/kallsyms | cut -f 1 -d " " | xargs`
+
+UINT_TEST=no
+# printf "%x" -1 returns (unsigned long)-1.
+if [ `printf "%x" -1 | wc -c` != 9 ]; then
+ UINT_TEST=yes
+fi
+
+echo 0 > events/enable
+echo > kprobe_events
+echo "p:testprobe ${TARGET_FUNC}" > kprobe_events
+echo "p:testprobe ${TARGET}" > kprobe_events
+echo "p:testprobe ${TARGET_FUNC}${NEXT}" > kprobe_events
+! echo "p:testprobe ${TARGET_FUNC}${PREV}" > kprobe_events
+if [ "${UINT_TEST}" = yes ]; then
+! echo "p:testprobe ${TARGET_FUNC}${OVERFLOW}" > kprobe_events
+fi
+echo > kprobe_events
+clear_trace