linux-kernel - Re: [PATCH v2 15/17] selftests: ftrace: Add a testcase for symbol type

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Date:   Thu, 22 Feb 2018 20:43:27 +0900
From:   Masami Hiramatsu <mhiramat@...nel.org>
To:     Masami Hiramatsu <mhiramat@...nel.org>
Cc:     Steven Rostedt <rostedt@...dmis.org>, linux-kernel@...r.kernel.org,
        Ingo Molnar <mingo@...hat.com>,
        Namhyung Kim <namhyung@...nel.org>,
        Tom Zanussi <tom.zanussi@...ux.intel.com>,
        Arnaldo Carvalho de Melo <acme@...nel.org>,
        linux-trace-users@...r.kernel.org, linux-kselftest@...r.kernel.org,
        shuah@...nel.org
Subject: Re: [PATCH v2 15/17] selftests: ftrace: Add a testcase for symbol
 type

On Thu, 22 Feb 2018 00:01:29 +0900
Masami Hiramatsu <mhiramat@...nel.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@...nel.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
> 


-- 
Masami Hiramatsu <mhiramat@...nel.org>