Gold does not support all the emulations that Gnu ld does, and supports
only one spelling per target. The -m option is used only in the rare case
where there are no ELF input files, and we produce an empty output file.
In those cases, users are expected to supply a -m option naming one of
the supported emulations. In the many cases where a build script provides
an unnecessary -m option naming an emulation that gold does not support,
we will simply ignore the option, as we did before the reverted patch.
gold/
PR gold/19119
PR gold/19172
PR gold/19197
Revert commit 6457197210:
2015-10-16 H.J. Lu <hongjiu.lu@intel.com>
* options.h (General_options): Remove "obsolete" from -m.
* parameters.cc (set_parameters_target): Check if input target
is compatible with output emulation set by "-m emulation".
With --no-apply-dynamic-relocs on aarch64 targets, gold will not apply
link-time values for absolute relocations that become dynamic relocations.
This provides a workaround for broken Android dynamic linkers that use
the link-time value as an extra addend to the relocation.
gold/
PR gold/19163
* aarch64.cc (Target_aarch64::Relocate::relocate): Don't apply
certain relocations if --no-apply-dynamic-relocs is set.
* options.h (--apply-dynamic-relocs): New aarch64-specific option.
The GOT entry size is target-dependent. This patch adds a got_entry_size
function to Sized_target class so that a target can provide a value
different from default.
PR gold/19184
* incremental.cc (Got_plt_view_info): Add got_entry_size.
(Local_got_offset_visitor::visit): Replace got_entry_size_
with info_.got_entry_size.
(Local_got_offset_visitor::got_entry_size_): Removed.
(Global_got_offset_visitor::visit): Replace got_entry_size_
with info_.got_entry_size.
(Global_got_offset_visitor::got_entry_size_): Removed.
(Output_section_incremental_inputs::write_got_plt): Initialize
view_info.got_entry_size.
* target.h (Sized_target::got_entry_size): New virtual function.
* x86_64.cc (Target_x86_64::got_entry_size): New function.
The R_386_GOT32 and R_386_GOT32X relocations may be used without base
register:
movl bar@GOT, %eax
Its calculation is G + A, instead of G + A - GOT, and it can only used
to generate non-PIC executable. Include the .got.plt section address
for R_386_GOT32 and R_386_GOT32X relocations without base register.
Don't allow R_386_GOT32 and R_386_GOT32X relocations without base
register when making a PIC output.
PR gold/19177
* i386.cc (Target_i386::Relocate::relocate): Check R_386_GOT32
and R_386_GOT32X relocations without base register.
This patch updates gold to treat the R_X86_64_GOTPCRELX and
R_X86_64_REX_GOTPCRELX relocations proposed in
https://groups.google.com/forum/#!topic/x86-64-abi/n9AWHogmVY0
the same as R_X86_64_GOTPCREL. FIXME: Gold should perform the
transformations as suggested.
elfcpp/
* x86_64.h (R_X86_64_GOTPCRELX): New.
(R_X86_64_REX_GOTPCRELX): Likewise.
gold/
* x86_64.cc (Target_x86_64<size>::Scan::get_reference_flags):
Treat R_X86_64_GOTPCRELX and R_X86_64_REX_GOTPCRELX the same
as R_X86_64_GOTPCREL.
(Target_x86_64<size>::Scan::local): Likewise.
(Target_x86_64<size>::Scan::possible_function_pointer_reloc):
Likewise.
(Target_x86_64<size>::Scan::global): Likewise.
(Target_x86_64<size>::Relocate::relocate): Likewise.
(Target_x86_64<size>::Relocatable_size_for_reloc::get_size_for_reloc):
Likewise.
This patch updates gold to treat the R_386_GOT32X relocation proposed in
https://groups.google.com/forum/#!topic/ia32-abi/GbJJskkid4I
the same as R_386_GOT32. FIXME: Gold should perform the transformations
as suggested.
elfcpp/
* i386.h (R_386_GOT32X): New.
gold/
* i386.cc (Target_i386::Scan::get_reference_flags(): Treat
R_386_GOT32X the same as R_386_GOT32.
(Target_i386::Scan::local): Likewise.
(Target_i386::Scan::possible_function_pointer_reloc): Likewise.
(Target_i386::Scan::global): Likewise.
(Target_i386::Relocate::relocate): Likewise.
(Target_i386::Relocatable_size_for_reloc::get_size_for_reloc):
Likewise.
x86_64_mov_to_lea1.o is a 64-bit x86-64 object and x86_64_mov_to_lea2.o
is a 32-bit x86-64 object. x86_64_mov_to_lea11 should use
x86_64_mov_to_lea2.o and x86_64_mov_to_lea12 should use
x86_64_mov_to_lea1.o.
* testsuite/Makefile.am (x86_64_mov_to_lea11): Replace
x86_64_mov_to_lea1.o with x86_64_mov_to_lea2.o.
(x86_64_mov_to_lea12): Replace x86_64_mov_to_lea2.o with
x86_64_mov_to_lea1.o.
* testsuite/Makefile.in: Regenerated.
Gold shouldn't ignore "-m emulation" command line option, which may
lead to incorrect output.
PR gold/19119
* options.h (General_options): Remove "obsolete" from -m.
* parameters.cc (set_parameters_target): Check if input target
is compatible with output emulation set by "-m emulation".
When applying a GOTDATA_OP* relocation to a local symbol, the addend
is being applied after getting the value of the symbol. When the
relocation refers to a merge section, however, the addend must be
provided when computing the symbol value, since the contents of
the section may have been rearranged.
gold/
PR gold/18855
* sparc.cc (Sparc_relocate_functions::gdop_hix22): Remove addend
parameter.
(Sparc_relocate_functions::gdop_lox10): Likewise.
(Target_sparc::Relocate::relocate): Use addend when computing
symbol value for R_SPARC_GOTDATA_OP*.
The previous commit to fix PR gold/18886 converted STT_IFUNC
to STT_FUNC when resolving to a symbol defined in a shared library.
This leads to an internal error if the shared library symbol is
seen first, as we do not convert the symbol at all.
We need to override the STT_IFUNC in add_from_dynobj() instead of
in override_base().
gold/
PR gold/18930
PR gold/18886
* resolve.cc (Symbol::override_base): Don't convert IFUNC symbols here.
* symtab.cc (Symbol_table::add_from_dynobj): Convert them here instead.
Turn IFUNC symbols from shared libraries into normal FUNC symbols when
we are resolving symbol references, instead of when we are writing out
the symbol table.
PR gold/18886
* resolve.cc (Symbol::override_base): Turn IFUNC symbols from
shared libraries into normal FUNC symbols.
* symtab.cc (Symbol_table::sized_write_symbol): Assert IFUNC
symbols aren't from shared libraries.
Gold version of a4b6fadd. Don't emit long branch or plt branch stubs
to save/restore functions. Copy them instead.
PR 18878
* powerpc.cc (Target_powerpc): Add savres_section_ and accessor.
(Target_powerpc::Branch_info::make_stub): Determine whether long
branch stub is for save/restore function.
(Branch_stub_ent): Add save_res_, and extra parm to constructor.
(Stub_table): Add need_save_res_.
(Stub_table:clear_stubs): Clear need_save_res_.
(Stub_table:set_address_and_size): Add save/restore section size.
(Stub_table::add_long_branch_entry): Add save_res param. Set
need_save_res_, but don't add space for save/restore stubs.
(Stub_table::find_long_branch_entry): Return offset to local copy
of save/restore func.
(Stub_table::do_write): Don't output save/restore stubs. Instead
copy the save/restore functions.
(Output_data_save_res:contents): New accessor.
(Target_powerpc::define_save_restore_funcs): Set savres_section_.
If a script specifies both address and region for an output section
declaration, gold ignores the region specification. This can lead to
bogus "moves backward" errors. This patch fixes gold so that if a
section specifies both address and region, it will place the section
at the specified address in the region, and update the location counter
within the region.
gold/
PR gold/18847
* script-sections.cc (Memory_region::set_address): New method.
(Script_sections::find_memory_region): Add explicit_only parameter.
(Output_section_definition::set_section_addresses): Handle case where
script specifies both address and vma region.
* script-sections.h (Script_sections::find_memory_region): Add
explicit_only parameter.
When a shared library is listed twice on the command line, the linker
ignores the second mention. If the first mention is in the scope of
an --as-needed option, and the second one is under the scope of a
--no-as-needed option, the --no-as-needed should take effect, but
doesn't. This patch keeps track of the objects we've already seen,
and updates the --as-needed flag so that if a shared object is ever
seen with --no-as-needed, it will be marked as such.
gold/
PR gold/18859
* object.cc (Input_objects::add_object): Store objects in a map,
indexed by soname; update as-needed flag when necessary.
* object.h (Object::clear_as_needed): New method.
(Input_objects::so_names_): Change from set to map.
When processing assignment expressions in a linker script, gold processes
absolute assignments early, but when one of those assignments involves the
address of a section that has not yet been finalized, we get an internal
error in address. This patch fixes the problem by gracefully returning
from expression evaluation even if the address is not yet valid, and
deferring the assignment in such a case.
gold/
PR gold/14746
* expression.cc (Expression::Expression_eval_info): Add
is_valid_pointer field.
(Expression::eval_maybe_dot): Add is_valid_pointer parameter.
Adjust all callers.
(Addr_expression::value_from_output_section): Check whether address
is valid.
* script.cc (Symbol_assignment::set_if_absolute): Defer assignment
if evaluation failed due to address that is not yet valid.
* script.h: (Expression::eval_maybe_dot): Add is_valid_pointer
parameter.
When a user object overrides a versioned definition in a shared object,
it's possible to trigger an internal error because the versioned
definition we saw didn't override the unversioned definition. This
was introduced by the fix for PR 18703. This patch fixes the problem
by reordering the tests so that we do not check ret->is_default()
until we're confident that the symbol is in fact versioned.
gold/
PR gold/18866
PR gold/18703
* symtab.cc (Symbol_table): Reorder conditions to avoid internal error.
A symbol value in an ELF final linked binary is absolute, in contrast
to a relocatable object file where the value is section relative. For
--emit-relocs it is therefore incorrect to use the value of a section
symbol as the addend when adjusting relocs against input section
symbols to output section symbols.
PR gold/18846
* target-reloc.h (relocate_relocs <RELOC_ADJUST_FOR_SECTION_RELA>):
Subtract os->address() from addend.
* powerpc.cc (relocate_relocs): Likewise.
If a symbol is defined with ".symver foo,foo@VER", the assembler
creates two symbols in the object: one unversioned, and one with
the (non-default) version "VER". If foo is listed in a version
script, gold would then make the first of those symbols the
default version, and would ignore the second symbol as a
duplicate, without making it a non-default version. While this is
arguably reasonable behavior, it doesn't match Gnu ld behavior,
so this patch fixes that by allowing the second definition to
override the first by resetting the "default version" indication.
Several test cases from the Gnu ld testsuite also exposed another
related problem, where a symbol defined with ".symver foo,foo@",
placed into a shared library, is not handled properly by gold.
This patch also fixes that case, binding the symbol to the base
version.
gold/
PR gold/18703
* dynobj.cc (Versions::record_version): Handle symbol defined with
base version.
(Versions::symbol_section_contents): Likewise.
* symtab.h (Symbol::set_is_not_default): New class method.
(Symbol_table::resolve): Add is_default_version parameter.
(Symbol_table::should_override): Likewise.
* resolve.cc (Symbol_table::resolve): Add is_default_version parameter,
and pass to should_override. Adjust all callers and explicit
instantiations.
(Symbol_table::should_override): Add is_default_value parameter;
allow default version in a dynamic object to override existing
definition from same object.
* symtab.cc (Symbol_table::add_from_object): Handle case where same
symbol is defined as unversioned and non-default version in the same
object.
* testsuite/Makefile.am (ver_test_13): New test case.
* testsuite/Makefile.in: Regenerate.
* testsuite/ver_test_4.cc: Add test for symbol with base version.
* testsuite/ver_test_4.sh: Likewise.
* testsuite/ver_test_13.c: New source file.
* testsuite/ver_test_13.script: New version script.
* testsuite/ver_test_13.sh: New test case.
GCC 5 will fold symbol address comparison, assuming each symbol has a
different address, which leads to abort. We should use separate
functions to compare symbol address.
PR gold/18663
* testsuite/Makefile.am (script_test_1_SOURCES): Set to
script_test_1a.cc script_test_1b.cc.
(script_test_11_r.o): Replace script_test_11.o with
script_test_11a.o script_test_11b.o.
(script_test_11.o): Removed.
(script_test_11a.o): New.
(script_test_11b.o): Likewise.
* testsuite/Makefile.in: Regenerated.
* testsuite/script_test_1.h: New file.
* testsuite/script_test_1b.cc: Likewise.
* testsuite/script_test_11.h: Likewise.
* testsuite/script_test_11b.c: Likewise.
* testsuite/script_test_1.cc: Renamed to ...
* testsuite/script_test_1a.cc: This.
Include "script_test_1.h".
(main): Call check_int and check_ptr.
* testsuite/script_test_11.c: Renamed to ...
* testsuite/script_test_11a.c: This.
Include "script_test_11.h".
(main): Call ptr_equal.
GCC 5 will generate a relocation for protected symbol:
https://gcc.gnu.org/bugzilla/show_bug.cgi?id=65248
when compiling for a shared library. It is undefined to access protected
symbol in IFUNC selector function inside a shared library.
PR gold/18628
* testsuite/ifuncdep2.c (global): Change protected to hidden.
* testsuite/ifuncmod1.c (global): Likewise.
* testsuite/ifuncmod5.c (global): Likewise.
When creating the special __start_ and __stop_ section symbols, gold
does not check the version script to see if they should be local
instead of global.
2015-07-21 Cary Coutant <ccoutant@gmail.com>
gold/
PR gold/18548
* symtab.cc (Symbol_table::do_define_in_output_data): Check for
forced local symbol even when oldsym != NULL.
(Symbol_table::do_define_in_output_segment): Likewise.
(Symbol_table::do_define_as_constant): Likewise.
Fix internal error when linking an archive library with no preceding objects.
gold/
PR gold/18698
* archive.cc (Library_base::should_include_member): Don't use entry
point for relocatable links, or if target is not yet valid.
* parameters.cc (Parameters::entry): Check target_valid().
gold/
PR gold/18696
* archive.cc (Library_base::should_include_member): Don't use entry
point for relocatable links, or if target is not yet valid.
* parameters.cc (Parameters::entry): Check target_valid().
gold/ChangeLog:
* aarch64.cc (AArch64_insn_utilities::is_adr): New method.
(AArch64_insn_utilities::aarch64_adr_encode_imm): New method.
(AArch64_insn_utilities::aarch64_adrp_decode_imm): New method.
(E843419_stub): New sub-class of Erratum_stub.
(AArch64_relobj::try_fix_erratum_843419_optimized): New method.
(AArch64_relobj::section_needs_reloc_stub_scanning): Try optimized fix.
(AArch64_relobj::create_erratum_stub): Add 1 argument.
(Target_aarch64::scan_erratum_843419_span): Pass in adrp insn offset.
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.
All programs in binutils+gdb git repo now support gABI compression
with the SHF_COMPRESSED bit. This patch makes the zlib-gabi option
as compression default for gas, gold, ld and objcopy, instead of the
zlib-gnu option whose outputs are incompatible with gABI.
binutils/
* objcopy.c (copy_file): Set BFD_COMPRESS_GABI if not
zlib-gnu.
* doc/binutils.texi: Change --compress-debug-sections and
--compress-debug-sections=zlib to zlib-gabi.
binutils/testsuite/
* binutils-all/compress.exp: Update.
gas/
* as.c (parse_args): Make --compress-debug-sections and
--compress-debug-sections=zlib the same as
--compress-debug-sections=zlib-gabi.
* doc/as.texinfo: Change --compress-debug-sections and
--compress-debug-sections=zlib to zlib-gabi.
gold/
* compressed_output.cc (Output_compressed_section::set_final_data_size):
Make --compress-debug-sections=zlib the same as
--compress-debug-sections=zlib-gabi.
* testsuite/Makefile.am (flagstest_compress_debug_sections.check):
Expect ".debug_.*" with the SHF_COMPRESSED bit, instead of
".zdebug_".
* testsuite/Makefile.in: Regenerated.
ld/
* emultempl/elf32.em (gld${EMULATION_NAME}_handle_option): Make
--compress-debug-sections=zlib the same as
--compress-debug-sections=zlib-gabi.
* ld.texinfo: Change --compress-debug-sections=zlib to zlib-gabi.
ld/testsuite/
* ld-elf/zlibbegin.rS: Updated to .debug_.* with the
SHF_COMPRESSED bit.
* ld-elf/zlibnormal.rS: Likewise.
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.
