Add SHF_COMPRESSED support to gas and objcopy

This patch adds --compress-debug-sections={none|zlib|zlib-gnu|zlib-gabi}
options to gas and objcopy for ELF files. They control how DWARF debug
sections are compressed.  --compress-debug-sections=none is equivalent to
--nocompress-debug-sections.  --compress-debug-sections=zlib and
--compress-debug-sections=zlib-gnu are equivalent to
--compress-debug-sections.  --compress-debug-sections=zlib-gabi compresses
DWARF debug sections with SHF_COMPRESSED from the ELF ABI.  No linker
changes are required to support SHF_COMPRESSED.

bfd/

	* archive.c (_bfd_get_elt_at_filepos): Also copy BFD_COMPRESS_GABI
	bit.
	* bfd.c (bfd::flags): Increase size to 18 bits.
	(BFD_COMPRESS_GABI): New.
	(BFD_FLAGS_SAVED): Add BFD_COMPRESS_GABI.
	(BFD_FLAGS_FOR_BFD_USE_MASK): Likewise.
	(bfd_update_compression_header): New fuction.
	(bfd_check_compression_header): Likewise.
	(bfd_get_compression_header_size): Likewise.
	(bfd_is_section_compressed_with_header): Likewise.
	* compress.c (MAX_COMPRESSION_HEADER_SIZE): New.
	(bfd_compress_section_contents): Return the uncompressed size if
	the full section contents is compressed successfully.  Support
	converting from/to .zdebug* sections.
	(bfd_get_full_section_contents): Call
	bfd_get_compression_header_size to get compression header size.
	(bfd_is_section_compressed): Renamed to ...
	(bfd_is_section_compressed_with_header): This.  Add a pointer
	argument to return compression header size.
	(bfd_is_section_compressed): Use it.
	(bfd_init_section_decompress_status): Call
	bfd_get_compression_header_size to get compression header size.
	Return FALSE if uncompressed section size is 0.
	* elf.c (_bfd_elf_make_section_from_shdr): Support converting
	from/to .zdebug* sections.
	* bfd-in2.h: Regenerated.

binutils/

	* objcopy.c (do_debug_sections): Add compress_zlib,
	compress_gnu_zlib and compress_gabi_zlib.
	(copy_options): Use optional_argument on compress-debug-sections.
	(copy_usage): Update --compress-debug-sections.
	(copy_file): Handle compress_zlib, compress_gnu_zlib and
	compress_gabi_zlib.
	(copy_main): Handle
	--compress-debug-sections={none|zlib|zlib-gnu|zlib-gabi}.
	* doc/binutils.texi: Document
	--compress-debug-sections={none|zlib|zlib-gnu|zlib-gabi}.

binutils/testsuite/

	* compress.exp: Add tests for
	--compress-debug-sections={none|zlib|zlib-gnu|zlib-gabi}.
	* binutils-all/dw2-3.rS: New file.
	* binutils-all/dw2-3.rt: Likewise.
	* binutils-all/libdw2-compressedgabi.out: Likewise.

gas/

	* as.c (show_usage): Update --compress-debug-sections.
	(std_longopts): Use optional_argument on compress-debug-sections.
	(parse_args): Handle
	--compress-debug-sections={none|zlib|zlib-gnu|zlib-gabi}.
	* as.h (compressed_debug_section_type): New.
	(flag_compress_debug): Change type to compressed_debug_section_type.
	--compress-debug-sections={none|zlib|zlib-gnu|zlib-gabi}.
	* write.c (compress_debug): Set BFD_COMPRESS_GABI for
	--compress-debug-sections=zlib-gabi.  Call
	bfd_get_compression_header_size to get compression header size.
	Don't rename section name for --compress-debug-sections=zlib-gabi.
	* config/tc-i386.c (compressed_debug_section_type): Set to
	COMPRESS_DEBUG_ZLIB.
	* doc/as.texinfo: Document
	--compress-debug-sections={none|zlib|zlib-gnu|zlib-gabi}.

gas/testsuite/

	* gas/i386/dw2-compressed-1.d: New file.
	* gas/i386/dw2-compressed-2.d: Likewise.
	* gas/i386/dw2-compressed-3.d: Likewise.
	* gas/i386/x86-64-dw2-compressed-2.d: Likewise.
	* gas/i386/i386.exp: Run dw2-compressed-2, dw2-compressed-1,
	dw2-compressed-3 and x86-64-dw2-compressed-2.

ld/testsuite/

	* ld-elf/compress.exp: Add a test for
	--compress-debug-sections=zlib-gabi.
	(build_tests): Add 2 tests for --compress-debug-sections=zlib-gabi.
	(run_tests): Likewise.
	Verify linker output with zlib-gabi compressed debug input.
	* ld-elf/compressed1a.d: New file.
	* ld-elf/compressed1b.d: Likewise.
	* ld-elf/compressed1c.d: Likewise.

5 files changed, 64 insertions, 2 deletions

diff --git a/ld/testsuite/ChangeLog b/ld/testsuite/ChangeLog
index ef54e67..cfa22f4 100644
--- a/ld/testsuite/ChangeLog
+++ b/ld/testsuite/ChangeLog
@@ -1,3 +1,14 @@
+2015-04-08  H.J. Lu  <hongjiu.lu@intel.com>
+
+	* ld-elf/compress.exp: Add a test for
+	--compress-debug-sections=zlib-gabi.
+	(build_tests): Add 2 tests for --compress-debug-sections=zlib-gabi.
+	(run_tests): Likewise.
+	Verify linker output with zlib-gabi compressed debug input.
+	* ld-elf/compressed1a.d: New file.
+	* ld-elf/compressed1b.d: Likewise.
+	* ld-elf/compressed1c.d: Likewise.
+
 2015-04-07  Alan Modra  <amodra@gmail.com>
 
 	* ld-arm/tls-gdesc-nlazy.g: Adjust for readelf note.
diff --git a/ld/testsuite/ld-elf/compress.exp b/ld/testsuite/ld-elf/compress.exp
index 682811a..adb7fc2 100644
--- a/ld/testsuite/ld-elf/compress.exp
+++ b/ld/testsuite/ld-elf/compress.exp
@@ -40,6 +40,10 @@ if { ![ld_assemble $as "--compress-debug-sections $srcdir/$subdir/empty.s" tmpdi
     fail "linker compressed debug sections"
 }
 
+if { ![ld_assemble $as "--compress-debug-sections=zlib-gabi $srcdir/$subdir/empty.s" tmpdir/emptyzlib.o ] } {
+    fail "linker compressed debug sections"
+}
+
 set build_tests {
   {"Build libfoo.so with compressed debug sections"
    "-shared" "-fPIC -g -Wa,--compress-debug-sections"
@@ -47,13 +51,31 @@ set build_tests {
   {"Build libbar.so with compressed debug sections"
    "-shared" "-fPIC -g -Wa,--compress-debug-sections"
    {begin.c end.c} {} "libbar.so"}
+  {"Build libfoozlib.so with compressed debug sections with zlib-gabi"
+   "-shared" "-fPIC -g -Wa,--compress-debug-sections=zlib-gabi"
+   {foo.c} {} "libfoozlib.so"}
+  {"Build libbarzlib.so with compressed debug sections with zlib-gabi"
+   "-shared" "-fPIC -g -Wa,--compress-debug-sections=zlib-gabi"
+   {begin.c end.c} {} "libbarzlib.so"}
 }
 
 set run_tests {
     {"Run normal with libfoo.so with compressed debug sections"
-     "tmpdir/begin.o tmpdir/libfoo.so tmpdir/end.o" "-Wa,--compress-debug-sections"
-     {main.c} "normal" "normal.out"}
+     "tmpdir/begin.o tmpdir/libfoo.so tmpdir/end.o" ""
+     {main.c} "normal" "normal.out" "-Wa,--compress-debug-sections"}
+    {"Run normal with libfoo.so with compressed debug sections with zlib-gabi"
+     "tmpdir/begin.o tmpdir/libfoozlib.so tmpdir/end.o" ""
+     {main.c} "normal" "normal.out" "-Wa,--compress-debug-sections=zlib-gabi"}
 }
 
 run_cc_link_tests $build_tests
 run_ld_link_exec_tests [] $run_tests
+
+set test_name "Link with zlib-gabi compressed debug input"
+send_log "cmp tmpdir/libfoo.so tmpdir/libfoozlib.so\n"
+if { [catch {exec cmp tmpdir/libfoo.so tmpdir/libfoozlib.so}] } then {
+    send_log "tmpdir/libfoo.so tmpdir/libfoozlib.so differ.\n"
+    fail "$test_name"
+} else {
+    pass "$test_name"
+}
diff --git a/ld/testsuite/ld-elf/compressed1a.d b/ld/testsuite/ld-elf/compressed1a.d
new file mode 100644
index 0000000..653c203
--- /dev/null
+++ b/ld/testsuite/ld-elf/compressed1a.d
@@ -0,0 +1,10 @@
+#source: compress1.s
+#as: --compress-debug-sections=zlib-gabi
+#ld: -e func_cu2
+#readelf: -t
+#notarget: alpha-*
+
+#failif
+#...
+  .*COMPRESSED.*
+#...
diff --git a/ld/testsuite/ld-elf/compressed1b.d b/ld/testsuite/ld-elf/compressed1b.d
new file mode 100644
index 0000000..83dc60f
--- /dev/null
+++ b/ld/testsuite/ld-elf/compressed1b.d
@@ -0,0 +1,9 @@
+#source: compress1.s
+#as: --compress-debug-sections=zlib-gabi
+#ld: -r
+#readelf: -t
+
+#failif
+#...
+  .*COMPRESSED.*
+#...
diff --git a/ld/testsuite/ld-elf/compressed1c.d b/ld/testsuite/ld-elf/compressed1c.d
new file mode 100644
index 0000000..64f75be
--- /dev/null
+++ b/ld/testsuite/ld-elf/compressed1c.d
@@ -0,0 +1,10 @@
+#source: compress1.s
+#as: --compress-debug-sections=zlib-gabi
+#ld: -shared
+#readelf: -t
+#target: *-*-linux* *-*-gnu*
+
+#failif
+#...
+  .*COMPRESSED.*
+#...