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   1 From 56cbeacf143530576905623ac72ae0964f3293a6 Mon Sep 17 00:00:00 2001
   2 From: =?UTF-8?q?Georg=20M=C3=BCller?= <georgmueller@gmx.net>
   3 Date: Wed, 28 Jun 2023 10:45:50 +0200
   4 Subject: perf probe: Add test for regression introduced by switch to die_get_decl_file()
   5 MIME-Version: 1.0
   6 Content-Type: text/plain; charset=UTF-8
   7 Content-Transfer-Encoding: 8bit
   8
   9 From: Georg Müller <georgmueller@gmx.net>
  10
  11 commit 56cbeacf143530576905623ac72ae0964f3293a6 upstream.
  12
  13 This patch adds a test to validate that 'perf probe' works for binaries
  14 where DWARF info is split into multiple CUs
  15
  16 Signed-off-by: Georg Müller <georgmueller@gmx.net>
  17 Acked-by: Masami Hiramatsu (Google) <mhiramat@kernel.org>
  18 Cc: Adrian Hunter <adrian.hunter@intel.com>
  19 Cc: Alexander Shishkin <alexander.shishkin@linux.intel.com>
  20 Cc: Ian Rogers <irogers@google.com>
  21 Cc: Ingo Molnar <mingo@redhat.com>
  22 Cc: Jiri Olsa <jolsa@kernel.org>
  23 Cc: Mark Rutland <mark.rutland@arm.com>
  24 Cc: Namhyung Kim <namhyung@kernel.org>
  25 Cc: Peter Zijlstra <peterz@infradead.org>
  26 Cc: regressions@lists.linux.dev
  27 Cc: stable@vger.kernel.org
  28 Link: https://lore.kernel.org/r/20230628084551.1860532-5-georgmueller@gmx.net
  29 Signed-off-by: Arnaldo Carvalho de Melo <acme@redhat.com>
  30 Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
  31 ---
  32  tools/perf/tests/shell/test_uprobe_from_different_cu.sh |   77 ++++++++++++++++
  33  1 file changed, 77 insertions(+)
  34  create mode 100755 tools/perf/tests/shell/test_uprobe_from_different_cu.sh
  35
  36 --- /dev/null
  37 +++ b/tools/perf/tests/shell/test_uprobe_from_different_cu.sh
  38 @@ -0,0 +1,77 @@
  39 +#!/bin/bash
  40 +# test perf probe of function from different CU
  41 +# SPDX-License-Identifier: GPL-2.0
  42 +
  43 +set -e
  44 +
  45 +temp_dir=$(mktemp -d /tmp/perf-uprobe-different-cu-sh.XXXXXXXXXX)
  46 +
  47 +cleanup()
  48 +{
  49 +       trap - EXIT TERM INT
  50 +       if [[ "${temp_dir}" =~ ^/tmp/perf-uprobe-different-cu-sh.*$ ]]; then
  51 +               echo "--- Cleaning up ---"
  52 +               perf probe -x ${temp_dir}/testfile -d foo
  53 +               rm -f "${temp_dir}/"*
  54 +               rmdir "${temp_dir}"
  55 +       fi
  56 +}
  57 +
  58 +trap_cleanup()
  59 +{
  60 +        cleanup
  61 +        exit 1
  62 +}
  63 +
  64 +trap trap_cleanup EXIT TERM INT
  65 +
  66 +cat > ${temp_dir}/testfile-foo.h << EOF
  67 +struct t
  68 +{
  69 +  int *p;
  70 +  int c;
  71 +};
  72 +
  73 +extern int foo (int i, struct t *t);
  74 +EOF
  75 +
  76 +cat > ${temp_dir}/testfile-foo.c << EOF
  77 +#include "testfile-foo.h"
  78 +
  79 +int
  80 +foo (int i, struct t *t)
  81 +{
  82 +  int j, res = 0;
  83 +  for (j = 0; j < i && j < t->c; j++)
  84 +    res += t->p[j];
  85 +
  86 +  return res;
  87 +}
  88 +EOF
  89 +
  90 +cat > ${temp_dir}/testfile-main.c << EOF
  91 +#include "testfile-foo.h"
  92 +
  93 +static struct t g;
  94 +
  95 +int
  96 +main (int argc, char **argv)
  97 +{
  98 +  int i;
  99 +  int j[argc];
 100 +  g.c = argc;
 101 +  g.p = j;
 102 +  for (i = 0; i < argc; i++)
 103 +    j[i] = (int) argv[i][0];
 104 +  return foo (3, &g);
 105 +}
 106 +EOF
 107 +
 108 +gcc -g -Og -flto -c ${temp_dir}/testfile-foo.c -o ${temp_dir}/testfile-foo.o
 109 +gcc -g -Og -c ${temp_dir}/testfile-main.c -o ${temp_dir}/testfile-main.o
 110 +gcc -g -Og -o ${temp_dir}/testfile ${temp_dir}/testfile-foo.o ${temp_dir}/testfile-main.o
 111 +
 112 +perf probe -x ${temp_dir}/testfile --funcs foo
 113 +perf probe -x ${temp_dir}/testfile foo
 114 +
 115 +cleanup