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to access a global as it expects a GOTPCREL relocation. This is really not
necessary as the linker could use a copy relocation to get around it. This
patch enables copy relocations with pie.
Context:
This is useful because currently the GCC compiler with option -fpie makes
every extern global access go through the GOT. That is because the compiler
cannot tell if a global will end up being defined in the executable or not
and is conservative. This ends up hurting performance when the binary is linked
as mostly static where most of the globals do end up being defined in the
executable. By allowing copy relocs with fPIE, the compiler need not generate
a GOTPCREL(GOT access) for any global access. It can safely assume that all
globals will be defined in the executable and generate a PC-relative access
instead. Gold can then create a copy reloc for only the undefined globals.
gold/
* symtab.h (may_need_copy_reloc): Remove check for position independent
code.
* x86_64.cc (Target_x86_64<size>::Scan::global): Add check for no
position independence before pc absolute may_need_copy_reloc call.
Add check for executable output befor pc relative may_need_copy_reloc
call.
* i386.cc: Ditto.
* arm.cc: Ditto.
* sparc.cc: Ditto.
* tilegx.cc: Ditto.
* powerpc.cc: Add check for no position independence before
may_need_copy_reloc calls.
* testsuite/pie_copyrelocs_test.cc: New file.
* testsuite/pie_copyrelocs_shared_test.cc: New file.
* Makefile.am (pie_copyrelocs_test): New test.
* Makefile.in: Regenerate.
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* i386.cc (Target_i386): Remove unused member dynbss_.
* arm.cc (Target_arm): Likewise.
* powerpc.cc (Target_powerpc): Likewise.
* sparc.cc (Target_sparc): Likewise.
* tilegx.cc (Target_tilegx): Likewise.
* x86_64.cc (Target_x86_64): Likewise.
* dwarf_reader.h (Dwarf_info_reader): Remove unused members
type_signature_, type_offset_.
* plugin.h (Plugin_hook): Remove unused member layout_.
* readsyms.h (Add_symbols): Remove unused members dirpath_, dirindex_,
mapfile_.
(Read_member): Remove unused members input_objects_, symtab_,
mapfile_, layout_.
(Check_library): Remove unused member symtab_.
* archive.h (Lib_group): Remove unused member lib_.
* archive.cc (Lib_group::Lib_group): Update initializer.
* incremental.h (Incremental_binary): Remove unused member target_.
(Incremental_script_entry): Removed unused member script_.
* layout.h (Write_symbols_task): Remove unused member input_objects_.
* icf.h (Icf): Remove unused member num_tracked_relocs.
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* parameters.cc (Parameters::entry): Return target-specific entry
symbol name.
* target.h (Target::entry_symbol_name): New function.
(Target_info::entry_symbol_name): New data member.
* arm.cc (Target_arm::arm_info): Add entry_symbol_name.
(Target_arm_nacl::arm_nacl_info): Likewise.
* i386.cc (Target_i386::i386_info): Likewise.
(Target_i386_nacl::i386_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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range, pass VIEW as NULL to relocate.relocate.
* arm.cc (Target_arm:Relocate::relocate): Check for a NULL view.
* i386.cc (Target_i386::Relocate::relocate): Likewise.
* powerpc.cc (Target_powerpc::Relocate::relocate): Likewise.
* sparc.cc (Target_sparc::Relocate::relocate): Likewise.
* tilegx.cc (Target_tilegx::Relocate::relocate): Likewise.
* x86_64.cc (Target_x86_64::Relocate::relocate): Likewise.
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* target.h (Sized_target::relocate_relocs): Use Elf_Off
for offset_in_output_section parameter.
(Sized_target::relocate_special_relocatable): Likewise.
* arm.cc (Target_arm::relocate_relocs): Likewise.
(Target_arm::relocate_special_relocatable): Likewise.
* i386.cc (Target_i386::relocate_relocs): Likewise.
* powerpc.cc (Target_powerpc::relocate_relocs): Likewise.
* sparc.cc (Target_sparc::relocate_relocs): Likewise.
* target-reloc.h (relocate_relocs): Likewise.
* testsuite/testfile.cc (Target_test): Likewise.
* tilegx.cc (Target_tilegx::relocate_relocs): Likewise.
* x86_64.cc (Target_x86_64::relocate_relocs): Likewise.
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(get_comdat_behaviour): ..this.
(relocate_section): Add Relocate_comdat_behavior template arg,
adjust code to suit.
* arm.cc (Target_arm::relocate_section): Adjust to suit.
(Target_arm::scan_reloc_section): Likewise.
* i386.cc (Target_i386::relocate_section): Likewise.
* sparc.cc (Target_sparc::relocate_section): Likewise.
* tilegx.cc (Target_tilegx::relocate_section): Likewise.
* x86_64.cc (Target_x86_64::relocate_section): Likewise.
* powerpc.cc (class Relocate_comdat_behavior): New.
(Target_powerpc::relocate_section): Don't zap opd relocs. Supply
gold::relocate_section with new template arg.
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address_for_local): Add plt offset to returned value. Adjust uses.
* sparc.cc (Output_data_plt_sparc::address_for_global,
address_for_local): Likewise.
* tilegx.cc (Output_data_plt_tilegx::address_for_global,
address_for_local): Likewise.
* x86_64.cc (Output_data_plt_x86_64::address_for_global,
address_for_local): Likewise.
* target.h (Target::plt_address_for_global, plt_address_for_local):
Update comment.
* output.cc (Output_reloc::symbol_value): Don't add plt offset here.
(Output_data_got::Got_entry::write): Nor here.
* output.h: Comment fix.
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bytes, so that the 16 bit relocations have a greater chance of
working.
* tilegx.cc (Target_tilegx::do_finalize_sections): Adjust
global_offset_table_ value for larget got.
(Target_tilegx::Relocate::relocate): Handle adjusted got value.
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* configure.ac (ENABLE_GOLD): support tilegx*
* configure: rebuild
elfcpp:
* tilegx.h: New file.
* elfcpp.h: add EM_TILEGX.
gold:
* tilegx.cc: New file.
* Makefile.am (TARGETSOURCES): Add tilegx.cc
(ALL_TARGETOBJS): Add tilegx.$(OBJEXT)
* configure.tgt: Add entries for tilegx*.
* configure.ac: Likewise.
* Makefile.in: Rebuild.
* configure: Likewise.
* testsuite/icf_safe_test.sh (arch_specific_safe_fold): Handle
tilegx.
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