readelf: Handle compressed sections and extend -z to cover -x and -p.

When printing a (non-string, non-data) section use uncompressed data when
possible. For dumping hex and string sections (-x and -p) -z will dump the
uncompressed data (otherwise the compressed data is dumped).

-z, --decompress           Show compression information for compressed
                           sections (when used with -S); decompress section
                           before dumping data (when used with -p or -x)

Includes test cases for ET_REL files using compressed relocation (target)
debug sections to test libdwfl transparent uncompression of sections.

Signed-off-by: Mark Wielaard <mjw@redhat.com>

1 files changed, 66 insertions, 0 deletions

diff --git a/tests/run-readelf-zx.sh b/tests/run-readelf-zx.sh
new file mode 100755
index 00000000..994528c0
--- /dev/null
+++ b/tests/run-readelf-zx.sh
@@ -0,0 +1,66 @@
+#! /bin/sh
+# Copyright (C) 2015 Red Hat, Inc.
+# This file is part of elfutils.
+#
+# This file is free software; you can redistribute it and/or modify
+# it under the terms of the GNU General Public License as published by
+# the Free Software Foundation; either version 3 of the License, or
+# (at your option) any later version.
+#
+# elfutils is distributed in the hope that it will be useful, but
+# WITHOUT ANY WARRANTY; without even the implied warranty of
+# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+# GNU General Public License for more details.
+#
+# You should have received a copy of the GNU General Public License
+# along with this program.  If not, see <http://www.gnu.org/licenses/>.
+
+. $srcdir/test-subr.sh
+
+# See run-elfgetchdr.sh for testfiles.
+
+testfiles testfile-zgnu64
+testrun_compare ${abs_top_builddir}/src/readelf -z -x.zdebug_aranges testfile-zgnu64 <<\EOF
+
+Hex dump of section [2] '.zdebug_aranges', 50 bytes (96 uncompressed) at offset 0x260:
+  0x00000000 2c000000 02000000 00000800 00000000 ,...............
+  0x00000010 78004000 00000000 14000000 00000000 x.@.............
+  0x00000020 00000000 00000000 00000000 00000000 ................
+  0x00000030 2c000000 02005500 00000800 00000000 ,.....U.........
+  0x00000040 8c004000 00000000 16000000 00000000 ..@.............
+  0x00000050 00000000 00000000 00000000 00000000 ................
+EOF
+
+testfiles testfile-zgabi64
+testrun_compare ${abs_top_builddir}/src/readelf -z -x.debug_aranges testfile-zgabi64 <<\EOF
+
+Hex dump of section [2] '.debug_aranges', 62 bytes (96 uncompressed) at offset 0x260:
+  0x00000000 2c000000 02000000 00000800 00000000 ,...............
+  0x00000010 78004000 00000000 14000000 00000000 x.@.............
+  0x00000020 00000000 00000000 00000000 00000000 ................
+  0x00000030 2c000000 02005500 00000800 00000000 ,.....U.........
+  0x00000040 8c004000 00000000 16000000 00000000 ..@.............
+  0x00000050 00000000 00000000 00000000 00000000 ................
+EOF
+
+testfiles testfile-zgnu32
+testrun_compare ${abs_top_builddir}/src/readelf -z -x.zdebug_aranges testfile-zgnu32 <<\EOF
+
+Hex dump of section [2] '.zdebug_aranges', 49 bytes (64 uncompressed) at offset 0x1c0:
+  0x00000000 1c000000 02000000 00000400 00000000 ................
+  0x00000010 54800408 14000000 00000000 00000000 T...............
+  0x00000020 1c000000 02004d00 00000400 00000000 ......M.........
+  0x00000030 68800408 16000000 00000000 00000000 h...............
+EOF
+
+testfiles testfile-zgabi32
+testrun_compare ${abs_top_builddir}/src/readelf -z -x.debug_aranges testfile-zgabi32 <<\EOF
+
+Hex dump of section [2] '.debug_aranges', 49 bytes (64 uncompressed) at offset 0x1c0:
+  0x00000000 1c000000 02000000 00000400 00000000 ................
+  0x00000010 54800408 14000000 00000000 00000000 T...............
+  0x00000020 1c000000 02004d00 00000400 00000000 ......M.........
+  0x00000030 68800408 16000000 00000000 00000000 h...............
+EOF
+
+exit 0