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authorH.J. Lu <hjl.tools@gmail.com>2015-07-12 10:50:25 -0700
committerH.J. Lu <hjl.tools@gmail.com>2015-07-12 10:50:40 -0700
commit480586639d6b814b2e87f6f106b8635cf7442b20 (patch)
tree8fcd160ca3fd8b27770e883a58937c1e50e3bc38 /gold/compressed_output.cc
parent8d6dbeb44ca93b836e3af8f8d3993997bf347112 (diff)
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Add SHF_COMPRESSED section decompression to gold
This patch adds SHF_COMPRESSED section decompression to gold. PR gold/18321 * compressed_output.h (decompress_input_section): Add arguments for ELF class, big endian and sh_flags. * compressed_output.cc (decompress_input_section): Likewise. Support the SHF_COMPRESSED section. * dynobj.h (Dynobj): Add elfsize and is_big_endian member functions. * plugin.h (Pluginobj): Likewise. * layout.cc (Layout::get_output_section_flags): Also clear the SHF_COMPRESSED bit. * object.h (Compressed_section_info): Add flag to store sh_flags. (Object): Add pure virtual elfsize and is_big_endian member functions. * object.cc (need_decompressed_section): Don't skip the ".zdebug" prefix here. (build_compressed_section_map): Check SHF_COMPRESSED for uncompressed size. Store sh_flags in Compressed_section_info. Pass size, big_endian and sh_flags to decompress_input_section. Skip the ".debug"/".zdebug" prefix when passing section name to need_decompressed_section. (Sized_relobj_file<size, big_endian>::do_find_special_section): Don't check ".zdebug_*" sections. (Object::decompressed_section_contents): Pass ELF class, big endian and sh_flags to decompress_input_section. * reloc.cc (Sized_relobj_file<size, big_endian>::write_sections): Likewise. * testsuite/Makefile.am (check_DATA): Add debug_msg_cdebug_gabi.err and gdb_index_test_2_gabi.stdout. (MOSTLYCLEANFILES): Add debug_msg_cdebug_gabi.err and gdb_index_test_2_gabi.stdout. (debug_msg_cdebug_gabi.o): New. (odr_violation1_cdebug_gabi.o): Likewise. (odr_violation2_cdebug_gabi.o): Likewise. (debug_msg_cdebug_gabi.err): Likewise. (check_SCRIPTS): Add gdb_index_test_2_gabi.sh. (gdb_index_test_cdebug_gabi.o): Likewise. (gdb_index_test_2_gabi): Likewise. (gdb_index_test_2_gabi.stdout): Likewise. * testsuite/gdb_index_test_2_gabi.sh: New file. * testsuite/Makefile.in: Regenerated.
Diffstat (limited to 'gold/compressed_output.cc')
-rw-r--r--gold/compressed_output.cc49
1 files changed, 48 insertions, 1 deletions
diff --git a/gold/compressed_output.cc b/gold/compressed_output.cc
index 8c9fc1e..02d7821 100644
--- a/gold/compressed_output.cc
+++ b/gold/compressed_output.cc
@@ -143,8 +143,55 @@ bool
decompress_input_section(const unsigned char* compressed_data,
unsigned long compressed_size,
unsigned char* uncompressed_data,
- unsigned long uncompressed_size)
+ unsigned long uncompressed_size,
+ int size,
+ bool big_endian,
+ elfcpp::Elf_Xword sh_flags)
{
+ if ((sh_flags & elfcpp::SHF_COMPRESSED) != 0)
+ {
+ unsigned int compression_header_size;
+ if (size == 32)
+ {
+ compression_header_size = elfcpp::Elf_sizes<32>::chdr_size;
+ if (big_endian)
+ {
+ elfcpp::Chdr<32, true> chdr(compressed_data);
+ if (chdr.get_ch_type() != elfcpp::ELFCOMPRESS_ZLIB)
+ return false;
+ }
+ else
+ {
+ elfcpp::Chdr<32, false> chdr(compressed_data);
+ if (chdr.get_ch_type() != elfcpp::ELFCOMPRESS_ZLIB)
+ return false;
+ }
+ }
+ else if (size == 64)
+ {
+ compression_header_size = elfcpp::Elf_sizes<64>::chdr_size;
+ if (big_endian)
+ {
+ elfcpp::Chdr<64, true> chdr(compressed_data);
+ if (chdr.get_ch_type() != elfcpp::ELFCOMPRESS_ZLIB)
+ return false;
+ }
+ else
+ {
+ elfcpp::Chdr<64, false> chdr(compressed_data);
+ if (chdr.get_ch_type() != elfcpp::ELFCOMPRESS_ZLIB)
+ return false;
+ }
+ }
+ else
+ gold_unreachable();
+
+ return zlib_decompress(compressed_data + compression_header_size,
+ compressed_size - compression_header_size,
+ uncompressed_data,
+ uncompressed_size);
+ }
+
const unsigned int zlib_header_size = 12;
/* Verify the compression header. Currently, we support only zlib