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lto_slim_object_ was unitialized. I also thought it worth adding
a sanity check on the .gnu.lto_.lto.* section size, and made some
other tidies.
PR 24768
* layout.cc (Layout::Layout): Init lto_slim_object_.
* object.cc (Sized_relobj_file::do_layout): Wrap overlong line.
Don't use C cast. Validate section size. Don't copy contents.
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When generating notoc call and branch stubs without the benefit of
pc-relative insns, the stubs need to use LR to access the run time PC.
All LR changes must be described in .eh_frame if we're to support
unwinding through asynchronous exceptions. That's what this patch
does.
The patch has gone through way too many iterations. At first I
attempted to add multiple FDEs, one for each stub. That ran into
difficulties with do_plt_fde_location which is only capable of setting
the address of a single FDE per Output_data section, and with removing
any FDEs added on a previous do_relax pass. Removing FDEs (git commit
be897fb774) went overboard in matching the FDE contents. That means
either stashing the contents created for add_eh_frame_for_plt to use
when calling remove_eh_frame_for_plt, or recreating contents on the
fly (*) just to remove FDEs. In fact, FDE content matching is quite
unnecesary. FDEs added by a previous do_relax pass are those with
u_.from_linker.post_map set. So they can easily be recognised just by
looking at that flag. This patch keeps that part of the multiple FDE
changes.
In the end I went for just one FDE per stub group to describe the call
stubs. That's reasonably efficient for the common case of only
needing to describe the __tls_get_addr_opt call stub. We don't expect
to be making many calls using notoc stubs without pc-relative insns.
*) Which has it's own set of problems. The contents must be recreated
using the old stub layout, but .eh_frame size can affect stub
requirements so you need to temporarily keep the old .eh_frame size
when creating new stubs, then reset .eh_frame size before adding new
FDEs.
* ehframe.cc (Fde::operator==): Delete.
(Cie::remove_fde): Delete.
(Eh_frame::remove_ehframe_for_plt): Delete fde_data and fde_length
parameters. Remove all post-map plt FDEs.
* ehframe.h (Fde:post_map): Make const, add variant to compare plt.
(Fde::operator==): Delete.
(Cie::remove_fde): Implement here.
(Cie::last_fde): New accessor.
(Eh_frame::remove_ehframe_for_plt): Update prototype.
* layout.cc (Layout::remove_eh_frame_for_plt): Delete fde_data and
fde_length parameters.
* layout.h (Layout::remove_eh_frame_for_plt): Update prototype.
* powerpc.cc (Stub_table::tls_get_addr_opt_bctrl_): Delete.
(Stub_table::plt_fde_len_, plt_fde_, init_plt_fde): Delete.
(Stub_table::add_plt_call_entry): Don't set tls_get_addr_opt_bctrl_.
(eh_advance): New function.
(stub_sort): New function.
(Stub_table::add_eh_frame): Emit eh_frame for notoc plt calls and
branches as well as __tls_get_addr_opt plt call stub.
(Stub_table::remove_eh_frame): Update to suit.
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section during linking.
gold * layout.cc (section_name_mapping): Add an entry for
.gnu.build.attributes.
ld * scripttempl/elf.sc: Place .gnu.build.attributes sections with
other read-only sections.
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The original patch did not give the target enough hooks to discover that
an input object file does not have a particular property. For the
GNU_PROPERTY_X86_FEATURE_1_AND property, for example, where a missing
property should be assumed to be all zeroes, and ANDed with other
object modules, this is essential. We now store the target-specific
properties locally in the Target structure as native uint32_t fields,
then AND the per-object feature bits with the program's feature bits
when we're finished processing each input object file. The target-specific
properties are then added back to the output note section during
finalization.
gold/
PR gold/22914
* layout.cc (read_sized_value): Fix spelling of section name.
(Layout::layout_gnu_property): Call Sized_target::record_gnu_property
for target-specific properties;
don't store them with target-independent properties yet.
(Layout::merge_gnu_properties): New method.
(Layout::add_gnu_property): New method.
(Layout::create_gnu_properties_note): Call target to finalize
target-specific properties. Fix spelling of output section name.
* layout.h (Layout::merge_gnu_properties): New method.
(Layout::add_gnu_property): New method.
* object.cc (Sized_relobj_file::do_layout): Call
Layout::merge_gnu_properties.
* target.h (Target::merge_gnu_property): Remove.
(Target::finalize_gnu_properties): New method.
(Target::do_merge_gnu_property): Move to Sized_target and rename.
(Target::do_finalize_gnu_properties): New virtual method.
(Sized_target::record_gnu_property): Moved and renamed from
Target::do_merge_gnu_property.
(Sized_target::merge_gnu_properties): New virtual method.
* x86_64.cc (Target_x86_64::isa_1_used_, isa_1_needed_)
(feature_1_, object_feature_1_, seen_first_object_): New data members.
(Target_x86_64::do_merge_gnu_property): Rename to ...
(Target_x86_64::record_gnu_property): ... this. Save target-specific
properties in Target class object.
(Target_x86_64::merge_gnu_properties): New method.
(add_property): New static inline function.
(Target_x86_64::do_finalize_gnu_properties): New method.
* testsuite/Makefile.am (gnu_property_test): Remove C source file;
link directly without compiler driver.
* testsuite/Makefile.in: Regenerate.
* testsuite/gnu_property_a.S: Add _start.
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elfcpp/
PR gold/22914
* elfcpp.h (NT_GNU_PROPERTY_TYPE_0): New note type.
(GNU_PROPERTY_*): New Gnu property types.
* x86_64.h (GNU_PROPERTY_X86_FEATURE_1_IBT)
(GNU_PROPERTY_X86_FEATURE_1_SHSTK): New x86 feature bits.
gold/
PR gold/22914
* layout.cc (Layout::Layout): Initialize gnu_properties_.
(read_sized_value, write_sized_value): New functions.
(Layout::layout_gnu_property): New method.
(Layout::create_notes): Call create_gnu_properties_note.
(Layout::create_gnu_properties_note): New method.
* layout.h (Layout::layout_gnu_property): New method.
(Layout::create_gnu_properties_note): New method.
(Layout::Gnu_property, Layout::Gnu_properties): New types.
(Layout::gnu_properties_): New data member.
* object.cc (Sized_relobj_file::layout_gnu_property_section): New
method.
(Sized_relobj_file::do_layout): Handle .note.gnu.property sections.
* object.h (Sized_relobj_file::layout_gnu_property_section): New
method.
* target.h (Target::merge_gnu_property): New method.
(Target::do_merge_gnu_property): New virtual method.
* x86_64.cc (Target_x86_64::do_merge_gnu_property): New method.
* testsuite/Makefile.am (gnu_property_test): New test case.
* testsuite/Makefile.in: Regenerate.
* testsuite/gnu_property_a.S: New source file.
* testsuite/gnu_property_b.S: New source file.
* testsuite/gnu_property_c.S: New source file.
* testsuite/gnu_property_main.c: New source file.
* testsuite/gnu_property_test.sh: New test script.
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During a -r (or --emit-relocs) link, if two sections had the same name but
different section types, gold would put relocations for both sections into
the same relocation section even though the data sections remained separate.
For .eh_frame sections, when one section is PROGBITS and another is
X86_64_UNWIND, we really should be using the UNWIND section type and
combining the sections anyway. For other sections, we should be
creating one relocation section for each output data section.
gold/
PR gold/23016
* incremental.cc (can_incremental_update): Check for unwind section
type.
* layout.h (Layout::layout): Add sh_type parameter.
* layout.cc (Layout::layout): Likewise.
(Layout::layout_reloc): Create new output reloc section if data
section does not already have one.
(Layout::layout_eh_frame): Check for unwind section type.
(Layout::make_eh_frame_section): Use unwind section type for .eh_frame
and .eh_frame_hdr.
* object.h (Sized_relobj_file::Shdr_write): New typedef.
(Sized_relobj_file::layout_section): Add sh_type parameter.
(Sized_relobj_file::Deferred_layout::Deferred_layout): Add sh_type
parameter.
* object.cc (Sized_relobj_file::check_eh_frame_flags): Check for
unwind section type.
(Sized_relobj_file::layout_section): Add sh_type parameter; pass it
to Layout::layout.
(Sized_relobj_file::do_layout): Make local copy of sh_type.
Force .eh_frame sections to unwind section type.
Pass sh_type to layout_section.
(Sized_relobj_file<size, big_endian>::do_layout_deferred_sections):
Pass sh_type to layout_section.
* output.cc (Output_section::Output_section): Initialize reloc_section_.
* output.h (Output_section::reloc_section): New method.
(Output_section::set_reloc_section): New method.
(Output_section::reloc_section_): New data member.
* target.h (Target::unwind_section_type): New method.
(Target::Target_info::unwind_section_type): New data member.
* aarch64.cc (aarch64_info): Add unwind_section_type.
* arm.cc (arm_info, arm_nacl_info): Likewise.
* i386.cc (i386_info, i386_nacl_info, iamcu_info): Likewise.
* mips.cc (mips_info, mips_nacl_info): Likewise.
* powerpc.cc (powerpc_info): Likewise.
* s390.cc (s390_info): Likewise.
* sparc.cc (sparc_info): Likewise.
* tilegx.cc (tilegx_info): Likewise.
* x86_64.cc (x86_64_info, x86_64_nacl_info): Likewise.
* testsuite/Makefile.am (pr23016_1, pr23016_2): New test cases.
* testsuite/Makefile.in: Regenerate.
* testsuite/testfile.cc: Add unwind_section_type.
* testsuite/pr23016_1.sh: New test script.
* testsuite/pr23016_1a.s: New source file.
* testsuite/pr23016_1b.s: New source file.
* testsuite/pr23016_2.sh: New test script.
* testsuite/pr23016_2a.s: New source file.
* testsuite/pr23016_2b.s: New source file.
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This option does not merge certain text sections with prefixes
.text.hot, .text.unlikely, .text.startup and .text.exit.
* layout.cc (Layout::default_section_order): Check for text section
prefixes.
(Layout::text_section_name_mapping): New static member.
(Layout::text_section_name_mapping_count): New static member.
(Layout::match_section_name): New static function.
(Layout::output_section_name): Check for text section prefixes.
* layout.h (Output_section_order::ORDER_TEXT_HOT): New enum value.
(Output_section_order::ORDER_TEXT_STARTUP): New enum value.
(Output_section_order::ORDER_TEXT_EXIT): New enum value.
(Output_section_order::ORDER_TEXT_UNLIKELY): New enum value.
(Layout::text_section_name_mapping): New static member.
(Layout::text_section_name_mapping_count): New static member.
(Layout::match_section_name): New static function.
* options.h (keep_text_section_prefix): New -z option.
* testsuite/Makefile.am (keep_text_section_prefix): New test.
* testsuite/Makefile.in: Regenerate.
* testsuite/keep_text_section_prefix.cc: New test source.
* testsuite/keep_text_section_prefix.sh: New test script.
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Since special symbol must be defined in a regular object, definition
from a dynamic object should be ignored. If special symbol has the
hidden or internal visibility, reference from a dynamic object should
also be ignored. Also __start and __stop symbols in a dynamic object
shouldn't be preempted.
PR gold/22291
* layout.cc (Layout::define_section_symbols): Use STV_PROTECTED
for __start and __stop symbols.
* symtab.cc (Symbol_table::define_special_symbol): Add an
argument, visibility. Ignore definition and reference from
a dynamic object, depending on visibility.
(Symbol_table::do_define_in_output_data): Pass visibility to
define_special_symbol.
(Symbol_table::do_define_in_output_segment): Likewise.
(Symbol_table::do_define_as_constant): Likewise.
(Symbol_table::add_undefined_symbol_from_command_line): Pass
STV_DEFAULT to define_special_symbol.
* symtab.h (Symbol_table::define_special_symbol): Add an
argument, visibility.
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2017-10-04 Sriraman Tallam <tmsriram@google.com>
* options.h (-z,text_unlikely_segment): New option.
* layout.cc (Layout::layout): Create new output section
for .text.unlikely sections with the new option.
(Layout::segment_precedes): Check for the new option
when segment flags match.
* testsuite/text_unlikely_segment.cc: New test source.
* testsuite/text_unlikely_segment.sh: New test script.
* testsuite/Makefile.am (text_unlikely_segment): New test.
* testsuite/Makefile.in: Regenerate.
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There is a very small but non-zero probability that a stub group
contains stubs on one relax pass, but does not on the next. In that
case we would get an FDE covering a zero length address range.
(Actually, it's even worse. Alignment padding for stubs can mean the
address for the non-existent stubs is past the end of the original
section to which stubs are attached, and due to the way
do_plt_fde_location calculates the length we can get a negative
length.) Fixing this properly requires removing the FDE.
Also, I have been implementing the __tls_get_addr_opt support for
gold, and that stub needs something other than the default FDE. The
necessary FDE will depend on the offset to the __tls_get_addr_opt
stub, which of course can change during relaxation. That means at the
very least, rewriting the FDE on each pass, possibly changing the FDE
size. I think that is better done by completely recreating PLT
eh_frame FDEs.
* ehframe.cc (Fde::operator==): New.
(Cie::remove_fde, Eh_frame::remove_ehframe_for_plt): New.
* ehframe.h (Fde::operator==): Declare.
(Cie::remove_fde, Eh_frame::remove_ehframe_for_plt): Likewise.
* layout.cc (Layout::remove_eh_frame_for_plt): New.
* layout.h (Layout::remove_eh_frame_for_plt): Declare.
* powerpc.cc (Target_powerpc::do_relax): Remove old eh_frame FDEs.
(Stub_table::add_eh_frame): Delete eh_frame_added_ condition.
Don't add eh_frame for empty stub section.
(Stub_table::remove_eh_frame): New.
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* layout.cc (Layout::segment_precedes): Add a case for testing
pointer equality when determining which segment precedes
another.
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Gold was not placing forced-local symbols (e.g., hidden visibility)
at the front of the dynamic symbol table, or including them in the
count of local symbols recorded in the .dynsym section's sh_info field.
gold/
* layout.cc (Layout::finalize): Track count of forced-local symbols
in .dynsym.
(Layout::create_symtab_sections): Add local_dynamic_count parameter;
use that instead of sh_info value.
(Layout::create_dynamic_symtab): Add pforced_local_dynamic_count
parameter; pass it to Symtab::set_dynsym_indexes(). Include forced
locals in sh_info value. Pass index of first real global to
Dynobj::create_gnu_hash_table() and Dynobj::create_elf_hash_table().
* layout.h (Layout::create_symtab_sections): Add local_dynamic_count
parameter.
(Layout::create_dynamic_symtab): Add pforced_local_dynamic_count
parameter.
* symtab.cc (Symbol_table::set_dynsym_indexes): Add pforced_local_count
parameter. Process forced-local symbols first and return the count.
(Symbol_table::finalize): Update comments.
* symtab.h (Symbol_table::set_dynsym_indexes): Add pforced_local_count
parameter.
(Symbol_table::first_dynamic_global_index_): Update comment.
(Symbol_table::dynamic_count_): Update comment.
* testsuite/Makefile.am (ifuncmod1.sh): New test case.
* testsuite/Makefile.in: Regenerate.
* testsuite/ifuncmod1.sh: New shell script.
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gold/
PR gold/14676
PR gold/20983
* layout.h (Layout::choose_output_section): Add match_input_spec
parameter. Adjust all callers.
* layout.cc (Layout::choose_output_section): Likewise. Pass
match_input_spec to Script_sections::output_section_name().
(Layout::create_note): Pass true for match_input_spec.
* script-sections.h (Script_sections::output_section_name): Add
match_input_spec parameter.
* script-sections.cc (Sections_element::output_section_name): Likewise.
(Output_section_definition::output_section_name): Likewise.
(Script_sections::output_section_name): Likewise.
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gold/
PR gold/20522
* layout.cc (Layout::choose_output_section): Add is_reloc parameter.
Adjust all callers. Do not use linker script for is_reloc sections.
(Layout::layout_reloc): Pass is_reloc == true.
* layout.h (Layout::choose_output_section): Add is_reloc parameter.
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* aarch64.cc: Fix spelling in comments.
* arm.cc: Fix spelling in comments.
* icf.cc: Fix spelling in comments.
* layout.cc: Fix spelling in comments.
* layout.h: Fix spelling in comments.
* mips.cc: Fix spelling in comments.
* output.h: Fix spelling in comments.
* plugin.h: Fix spelling in comments.
* script-sections.h: Fix spelling in comments.
* script.h: Fix spelling in comments.
* stringpool.h: Fix spelling in comments.
* tilegx.cc: Fix spelling in comments.
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2016-11-21 Igor Kudrin <ikudrin@accesssoftek.com>
gold/
* layout.cc: Include windows.h and rpcdce.h (for MinGW32).
(Layout::create_build_id): Generate uuid using UuidCreate().
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gold/
* options.h (General_options): Grok -z stack-size.
* output.h (Output_segment::set_size): New method.
* layout.cc (Layout::create_executable_stack_info): Renamed to ...
(Layout::create_stack_segment): ... this. Always create the
segment if -z stack-size was used.
(Layout::set_segment_offsets): Don't call ->set_offset on the
PT_GNU_STACK segment.
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gold/
PR gold/19019
* layout.h (Layout::add_target_specific_dynamic_tag): New function.
* layout.cc (Layout::add_target_specific_dynamic_tag): New function.
* mips.cc (Target_mips::make_symbol): Adjust function signature.
* sparc.cc (Target_sparc::Target_sparc): Initialize register_syms_.
(Target_sparc::do_is_defined_by_abi): Remove test for
STT_SPARC_REGISTER.
(Target_sparc::Register_symbol): New struct type.
(Target_sparc::register_syms_): New data member.
(Target_sparc<64, true>::sparc_info): Set has_make_symbol to true.
(Target_sparc::make_symbol): New function.
(Target_sparc::do_finalize_sections): Add register symbols and new
dynamic table entries.
* symtab.h (Sized_symbol::init_undefined): Add value parameter.
(Symbol_table::add_target_global_symbol): New function.
(Symbol_table::target_symbols_): New data member.
* symtab.cc (Sized_symbol::init_undefined): Add value parameter.
(Symbol_table::Symbol_table): Initialize target_symbols_.
(Symbol_table::add_from_object): Pass additional parameters to
Target::make_symbol.
(Symbol_table::define_special_symbol): Likewise.
(Symbol_table::add_undefined_symbol_from_command_line): Pass 0 for
undefined symbol value.
(Symbol_table::set_dynsym_indexes): Process target-specific symbols.
(Symbol_table::sized_finalize): Likewise.
(Symbol_table::sized_write_globals): Likewise.
* target.h (Sized_target::make_symbol): Add name, st_type, object,
st_shndx, and value parameters.
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gold/
* dynobj.cc (Dynobj::create_elf_hash_table): Create hash table with
target-specific entry size.
(Dynobj::sized_create_elf_hash_table): Add size template parameter.
* dynobj.h (Dynobj::sized_create_elf_hash_table): Likewise.
* layout.cc (Layout::create_dynamic_symtab): Set entsize to
hash_entry_size.
* target.h (Target::hash_entry_size): New method.
(Target::Target_info::hash_entry_size): New data member.
* aarch64.cc (Target_aarch64::aarch64_info): Add hash_entry_size.
* arm.cc (Target_arm::arm_info): Likewise.
(Target_arm_nacl::arm_nacl_info): Likewise.
* i386.cc (Target_i386::i386_info): Likewise.
(Target_i386_nacl::i386_nacl_info): Likewise.
(Target_iamcu::iamcu_info): Likewise.
* mips.cc (Target_mips::mips_info): Likewise.
(Target_mips_nacl::mips_nacl_info): Likewise.
* powerpc.cc (Target_powerpc::powerpc_info): Likewise.
* sparc.cc (Target_sparc::sparc_info): Likewise.
* tilegx.cc (Target_tilegx::tilegx_info): Likewise.
* x86_64.cc (Target_x86_64::x86_64_info): Likewise.
(Target_x86_64_nacl::x86_64_nacl_info): Likewise.
* testsuite/testfile.cc (Target_test::test_target_info): Likewise.
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For relocatable link, we should clear the SHF_COMPRESSED flag bit from
input group section.
PR gold/18689
* layout.cc (Layout::layout): Clear the SHF_COMPRESSED flag bit
from input group section for relocatable link.
* testsuite/Makefile.am (check_SCRIPTS): Add pr18689.sh.
(check_DATA): Add pr18689.stdout.
(MOSTLYCLEANFILES): Add pr18689a.o pr18689b.o.
(pr18689.stdout): New rule.
(pr18689a.o): Likewise.
(pr18689b.o): Likewise.
(pr18689.o): Likewise.
* testsuite/pr18689.c: New file.
* testsuite/pr18689.sh: Likewise.
* testsuite/Makefile.in: Regenerated.
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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.
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When laying out .debug_* sections, we translate the names of compressed
debug sections that start with ".zdebug", but when processing input
section specs in a linker script, we do not handle the translation there.
This results in an internal error as reported in PR 17731.
gold/
PR gold/17731
* layout.cc (corresponding_uncompressed_section_name): New function.
(Layout::choose_output_section): Call it.
* layout.h (corresponding_uncompressed_section_name): New function.
* script-sections.cc (Input_section_info::set_section_name): Check
for compressed debug section (.zdebug style).
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When --build-id=tree is selected, gold would schedule a set of
tasks to run to compute md5 hashes in parallel on chunks of the
file. The scheduling was done before the
Write_after_input_sections_task ran, so if we are compressing
debug sections, the output file will change size and be remapped
to a new address, sometimes causing the build id computation to
crash, but even when it doesn't crash, it wouldn't include the
debug information in the hash computation.
This patch delays the scheduling of the md5 tasks until after
Write_after_input_sections_task.
gold/
PR gold/17819
* gold.cc (queue_final_tasks): When --build-id=tree, queue a
separate task to schedule the build id computation.
* layout.cc (Hash_task::Hash_task): Remove build_id_blocker,
add Output_file and offset.
(Hash_task::run): Get and release the input views.
(Hash_task::is_runnable): Always return NULL (always runnable).
(Layout::queue_build_id_tasks): Remove.
(Layout::write_build_id): Add array_of_hashes and size_of_hashes
parameters; use them instead of class members.
(Build_id_task_runner::run): New function.
(Close_task_runner::run): Pass array_of_hashes and size_of_hashes
to write_build_id.
* layout.h (Layout::queue_build_id_tasks): Remove.
(Layout::write_build_id): Add array_of_hashes and size_of_hashes
parameters.
(Layout::array_of_hashes_): Remove.
(Layout::size_of_array_of_hashes_): Remove.
(Layout::input_view_): Remove.
(Build_id_task_runner): New class.
(Close_task_runner::Close_task_runner): Add array_of_hashes and
size_of_hashes parameters.
(Close_task_runner::array_of_hashes_): New data member.
(Close_task_runner::size_of_hashes_): New data member.
* testsuite/Makefile.am
(flagstest_compress_debug_sections_and_build_id_tree): New test.
* testsuite/Makefile.in: Regenerate.
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Because the __EH_FRAME_BEGIN__ symbol is provided in an empty .eh_frame
section in crtbeginT.o, if crt1.o has a non-empty .eh_frame section,
we place all optimized .eh_frame sections into the output section ahead
of the __EH_FRAME_BEGIN__ symbol, which breaks EH for statically-linked
binaries.
This patch fixes the problem by delaying the attachment of the optimized
.eh_frame sections to the output section until we see the end marker
section (or to the end of pass 1 if we never see an end marker).
gold/
PR gold/14675
* ehframe.cc (Eh_frame::add_ehframe_input_section): Change return type;
return enum indicating whether .eh_frame section is empty, optimizable,
unrecognized, or an end marker. Adjust explicit instantiations.
* ehframe.h (Eh_frame::Eh_frame_section_disposition): New enum type.
(Eh_frame::add_ehframe_input_section): Change return type.
* gold.cc (queue_middle_tasks): Call Layout::finalize_eh_frame_section.
* layout.cc (Layout::layout_eh_frame): Don't add optimized sections
to the .eh_frame output section until we see the end marker.
(Layout::finalize_eh_frame_section): New.
* layout.h: (Layout::finalize_eh_frame_section): New.
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In PR 13577, the complaint was that -Bsymbolic was overriding the binding
behavior for symbols listed in the --dynamic-list by setting the DT_SYMBOLIC
tag in the dynamic table. In reading the Gnu ld manual, I decided that
--dynamic-list should be mutually exclusive of -Bsymbolic, and modified
gold so that --dynamic-list would treat symbols listed as preemptible,
and all other symbols as internally bound. I was wrong.
PR 16992 shows that with --dynamic-list (and not -Bsymbolic), a symbol
not listed in the dynamic list is being internally bound within the
shared library, but because it's still in the dynamic symbol table, we
expose it to a COPY relocation, and things go really bad from there.
(I can reproduce the same failure, simply by turning on -Bsymbolic-functions
with the Gnu linker. Even though the symbol is bound internally, it's
still exported to the dynamic symbol table, and is exposed to a COPY
relocation.)
I've backed out part of the fix for PR 13577, and -Bsymbolic (or
-Bsymbolic-functions) can now be used with --dynamic-list, but if the
two are used together, we do not set DT_SYMBOLIC or DF_SYMBOLIC
(this matches Gnu ld behavior). We now treat symbols listed in the
dynamic list as premptible, but we do not automatically treat symbols
not listed there as non-premptible.
gold/
PR gold/13577
PR gold/16992
* layout.cc (Layout::finish_dynamic_section): Don't set DT_SYMBOLIC or
DF_SYMBOLIC if --dynamic-list option is used.
* options.cc (General_options::finalize): --dynamic-list is not
mutually exclusive with -Bsymbolic.
* symtab.h (Symbol::is_preemptible): Don't exclude dynamic symbols not
listed in --dynamic-list.
* testsuite/Makefile.am (dynamic_list_lib2.so): Add
-Bsymbolic-functions.
* testsuite/Makefile.in: Regenerate.
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This fixes an issue where a page-aligned data section, combined with -z relro,
could lead to a gap between text and data segments larger than a page, and
we would fail to overlap the segments in the file.
gold/
* layout.cc (Layout::set_segment_offsets): Don't align start of segment
unless alignment is larger than page size.
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gold/
* layout.cc (Layout::finish_dynamic_section): When '-z global'
is specified set DF_1_GLOBAL in DT_FLAGS_1 flags.
* options.h (General_options): New -z option (global).
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PR gold/17578 notes that gold will print a warning about an executable stack
when the -z execstack option is given, even when there is no --warn_execstack
option. The warning is completely useless and unexpected, since the user
explicitly requested an executable stack, and did not even ask for warnings.
This patch fixes that, and adds an extra warning when --warn_execstack
and -z noexecstack are both given and an input file requires an executable
stack.
gold/
PR gold/17578
* layout.cc (Layout::layout_gnu_stack): Don't warn when -z execstack
is given.
(Layout::create_executable_stack_info): Warn when -z noexecstack is
given but some inputs require executable stack.
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Add .debug_gdb_scripts, .debug_gnu_pubnames, .debug_gnu_pubtypes,
and .debug_str_offsets to lists of sections to strip or keep
when stripping debug info.
gold/
* layout.cc (gdb_sections): Keep .debug_gdb_scripts and
.debug_str_offsets; strip .debug_gnu_pubnames and
.debug_gnu_pubtypes.
(lines_only_debug_sections): Strip all four new sections.
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When --hash-style-both is used, gold currently builds the sysv hash
table first, then the gnu hash table. Building the gnu hash table
renumbers the dynamic symbol table, invalidating the sysv hash
table. This patch reverses the order in which the hash tables are
build so that both hash tables are correct.
gold/
PR gold/13597
* layout.cc (Layout::create_dynamic_symtab): Build gnu-style
hash table before sysv-style hash table.
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2014-09-23 Taiju Tsuiki <tzik@google.com>
Cary Coutant <ccoutant@google.com>
gold/
* gold.cc (queue_final_tasks): Add Write_sections_task as a blocker
on input_sections_blocker.
* layout.cc (Write_sections_task::locks): Unblock
input_sections_blocker_.
* layout.h (Write_sections_task::Write_sections_task): Add
input_sections_blocker.
* testsuite/Makefile.am (exception_x86_64_bnd_test): Add gcctestdir/ld
to DEPENDENCIES.
* testsuite/Makefile.in: Regenerate.
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gold/
PR gold/16980
* layout.cc (Layout::print_to_mapfile): Print unattached sections in
map.
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When not stripping those sections, there was a bug where gold was incorrectly
adjusting section-relative offsets by the offset of the input section within
the output section. That adjustment was both unnecessary and wrong, causing
gold to miss a number of debug entries that should have been added to
.gdb_index. (With stripping, the adjustment was always 0, so the bug in
dwarf_reader.cc would have been hidden by the change to layout.cc.)
gold/
* dwarf_reader.h (Dwarf_pubnames_table): Remove output_section_offset_.
* dwarf_reader.cc (Dwarf_pubnames_table::read_section): Likewise.
(Dwarf_pubnames_table::read_header): Likewise.
* layout.cc (gdb_fast_lookup_sections): Add .debug_gnu_pubnames and
.debug_gnu_pubtypes.
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2014-05-02 Cary Coutant <ccoutant@google.com>
* defstd.cc (in_segment): Define __ehdr_start here...
* layout.cc (Layout::finalize): ...Instead of here. Set the
output segment when known.
* resolve.cc (Symbol::override_base_with_special): Remember
the original binding.
* symtab.cc (Symbol::set_output_segment): New function.
(Symbol::set_undefined): New function.
* symtab.h (Symbol::is_weak_undefined): Check original undef
binding.
(Symbol::is_strong_undefined): New function.
(Symbol::set_output_segment): New function.
(Symbol::set_undefined): New function.
* target-reloc.h (is_strong_undefined): Remove.
(issue_undefined_symbol_error): Call Symbol::is_weak_undefined.
Check for hidden undefs.
(relocate_section): Call Symbol::is_strong_undefined.
* testsuite/Makefile.am (ehdr_start_test_1)
(ehdr_start_test_2, ehdr_start_test_3)
(ehdr_start_test_4, ehdr_start_test_5): New test cases.
* testsuite/Makefile.in: Regenerate.
* testsuite/ehdr_start_def.cc: New source file.
* testsuite/ehdr_start_test.cc: New source file.
* testsuite/ehdr_start_test.t: New linker script.
* testsuite/ehdr_start_test_4.sh: New shell script.
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2014-04-15 Sasa Stankovic <Sasa.Stankovic@imgtec.com>
gold/
* layout.cc (Layout::include_section): Allow a target to decide
whether to include a section.
* target.h (Target::should_include_section): New function.
(Target::do_should_include_section): New function.
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* output.cc (Output_segment::set_section_addresses): Take new
Target* argument. If target->isolate_execinstr() and the segment
is executable and starts at a target->abi_pagesize() boundary,
pad its end out to a target->abi_pagesize() boundary with code fill.
* output.h (Output_segment::set_section_addresses): Update decl.
* layout.h (Layout::check_output_data_for_reset_values): Take new
argument RELAX_OUTPUTS.
(Layout): New member relax_output_list_.
(Layout::add_relax_output): New method.
* layout.cc (Layout::Layout): Update constructor.
(Layout::reset_relax_output): New method.
(Layout::clean_up_after_relaxation): Call it.
(Layout::prepare_for_relaxation): Update caller.
(Layout::set_segment_offsets): Update callers of set_section_addresses.
Call reset_relax_output before re-processing segments for
isolate_execinstr case.
(Layout::write_data): Handle relax_output_list_.
(Layout::Relaxation_debug_check::check_output_data_for_reset_values):
Take new argument RELAX_OUTPUTS. Assert it's an empty collection.
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* options.h (General_options): Add -Trodata-segment option.
* parameters.cc (Parameters::check_rodata_segment): New function.
(Parameters::set_target_once): Call it.
* parameters.h (Parameters): Declare it (private member function).
* layout.cc (load_seg_unusable_for_headers): New function, broken
out of Layout::relaxation_loop_body. If TARGET->isolate_execinstr()
then validate rodata segment rather than text segment.
(relaxation_loop_body): Call that.
(is_text_segment): New function. Don't admit a non-executable
segment if TARGET->isolate_execinstr().
(set_segment_offsets): Call it. Honor -Trodata-segment option.
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gold/
* layout.cc (Layout::set_segment_offsets): Taking care of the case when
the maximum segment alignment is larger than the page size.
* testsuite/Makefile.am (large_symbol_alignment): Test that Gold
correctly aligns the symbols with large alignemnt.
* testsuite/Makefile.in: Regenerate.
* testsuite/large_symbol_alignment.cc: New file.
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Sriraman Tallam <tmsriram@google.com>
* options.h (sort_section): New option.
* output.h (Input_section_sort_section_prefix_special_ordering_compare):
Rename from Input_section_sort_section_name_special_ordering_compare.
(Input_section_sort_section_name_compare): New struct.
* output.cc (Output_section::Input_section_sort_section_name_compare::
operator()): New function.
(Output_section::sort_attached_input_sections): Use new sort function
for .text if --sort-section=name is specified.
* layout.cc (Layout::make_output_section):
Add sorting by name when --sort-section=name is specified.
* testsuite/Makefile.am (text_section_grouping): Test option
--sort-section=name.
* testsuite/Makefile.in: Regenerate.
* testsuite/section_sorting_name.cc: New file.
* testsuite/section_sorting_name.sh: New file.
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* options.h (General_options): Add --rosegment-gap option.
* options.cc (finalize): --rosegment-gap implies --rosegment.
* layout.cc (set_segment_offsets): Let user option override
target->rosegment_gap().
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PR ld/15365
* layout.cc (Layout::finalize): Make __ehdr_start STV_HIDDEN.
ld/
PR ld/15365
* emultempl/elf32.em (gld${EMULATION_NAME}_before_allocation):
Restrict __ehdr_start's export class to no less than STV_HIDDEN.
ld/testsuite/
PR ld/15365
* ld-elf/ehdr_start.d: Expect __ehdr_start to be STB_LOCAL.
* ld-mips-elf/ehdr_start-1.nd: New test.
* ld-mips-elf/ehdr_start-2.nd: New test.
* ld-mips-elf/ehdr_start-1.ld: New test linker script.
* ld-mips-elf/ehdr_start-2.ld: New test linker script.
* ld-mips-elf/ehdr_start-new.s: New test source.
* ld-mips-elf/ehdr_start-o32.s: New test source.
* ld-mips-elf/mips-elf.exp: Run the new tests.
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gold/
* gold.cc (queue_final_tasks): invoke layout->queue_build_id_tasks().
* layout.cc (Hash_task): New class.
(Layout::queue_build_id_tasks): New function.
(Layout::write_build_id): Handle single-thread portion of build ID
computation. (In some cases, all of it is single-threaded.) Replace
{sha1,md5}_process_bytes with {sha1,md5}_buffer to get the same
functionality in fewer lines of code.
* layout.h (Layout::queue_build_id_tasks): New function declaration.
* options.h (General_options): make "--build-id" default to tree
rather than sha1. Add two new options related to --build-id=tree:
--build-id-chunk-size-for-treehash and
--build-id-min-file-size-for-treehash.
* Makefile.am: add testing of --build-id=tree and related new options
(these tests will be invoked by "make check").
* Makefile.in: Regenerate.
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* layout.cc (Layout::segment_precedes): Allow more than one
segment with the same type and flags.
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