There are extensions to x86-64 psABI:
https://groups.google.com/forum/#!topic/x86-64-abi/de5_KnLHxtI
to call tls_get_addr via GOT:
call *__tls_get_addr@GOTPCREL(%rip)
Since direct call is 4-byte long and indirect call, is 5-byte long, the
extra one byte must be handled properly.
For general dynamic model, one 0x66 prefix before call instruction is
removed to make room for indirect call. For local dynamic model, we
simply use 5-byte indirect call.
TLS linker optimization is updated to recognize new instruction
patterns. For local dynamic model to local exec model transition, we
generate 4 0x66 prefixes, instead of 3, before mov instruction in 64-bit
and generate a 5-byte nop, instead of 4-byte, before mov instruction in
32-bit.
PR gold/20216
* configure.ac (DEFAULT_TARGET_X86_64_OR_X32): New
AM_CONDITIONAL.
* configure: Regenerated.
* x86_64.cc (Target_x86_64<size>::Relocate::relocate): Allow
R_X86_64_GOTPCRELX relocation against __tls_get_addr.
(Target_x86_64<size>::Relocate::tls_gd_to_ie): Support indirect
call to __tls_get_addr.
(Target_x86_64<size>::Relocate::tls_gd_to_le): Likewise.
(Target_x86_64<size>::Relocate::tls_ld_to_le): Likewise.
* testsuite/Makefile.am (check_PROGRAMS): Add pr20216a_test,
pr20216b_test, pr20216c_test, pr20216d_test, pr20216e_test.
(pr20216a_test_SOURCES): New.
(pr20216a_test_DEPENDENCIES): Likewise.
(pr20216a_test_CFLAGS): Likewise.
(pr20216a_test_LDFLAGS): Likewise.
(pr20216a_test_LDADD): Likewise.
(pr20216b_test_SOURCES): Likewise.
(pr20216b_test_DEPENDENCIES): Likewise.
(pr20216b_test_CFLAGS): Likewise.
(pr20216b_test_LDFLAGS): Likewise.
(pr20216b_test_LDADD): Likewise.
(pr20216c_test_SOURCES): Likewise.
(pr20216c_test_DEPENDENCIES): Likewise.
(pr20216c_test_CFLAGS): Likewise.
(pr20216c_test_LDFLAGS): Likewise.
(pr20216c_test_LDADD): Likewise.
(pr20216d_test_SOURCES): Likewise.
(pr20216d_test_DEPENDENCIES): Likewise.
(pr20216d_test_CFLAGS): Likewise.
(pr20216d_test_LDFLAGS): Likewise.
(pr20216d_test_LDADD): Likewise.
(pr20216e_test_SOURCES): Likewise.
(pr20216e_test_DEPENDENCIES): Likewise.
(pr20216e_test_CFLAGS): Likewise.
(pr20216e_test_LDFLAGS): Likewise.
(pr20216e_test_LDADD): Likewise.
(pr20216a.so): Likewise.
(pr20216b.so): Likewise.
(pr20216_gd.o): Likewise.
(pr20216_ld.o): Likewise.
(MOSTLYCLEANFILES): Add pr20216a.so pr20216b.so.
* testsuite/Makefile.in: Regenerated.
* testsuite/pr20216_def.c: New file.
* testsuite/pr20216_gd.S: Likewise.
* testsuite/pr20216_ld.S: Likewise.
* testsuite/pr20216_main.c: Likewise.
PowerPC gcc aligns char arrays to a word which results in the test
failing since it expects a char alignment. As the test already uses
gcc attributes to assign variables to sections, we may as well use an
attribute to align too.
* testsuite/plugin_layout_with_alignment.c: Explicitly align all
variables.
A target like powerpc64 that is PIC by default doesn't need copy relocs.
* testsuite/Makefile.am (copy_test_protected): Disable for powerpc.
* testsuite/Makefile.in: Regenerate.
According to "ELF for the ARM(r) 64-bit Architecture (AArch64)",
this relocation can be used "to prevent removal of sections that
might otherwise appear to be unused."
gold/
* aarch64-reloc.def (NONE): New relocation.
* aarch64.cc (Target_aarch64::Scan::local): Handle R_AARCH64_NONE.
(Target_aarch64::Scan::global): Likewise.
* testsuite/Makefile.am (aarch64_reloc_none): New test.
* testsuite/Makefile.in: Regenerate.
* testsuite/aarch64_reloc_none.s: New test source file.
* testsuite/aarch64_reloc_none.sh: New test script.
Please see patch discussion:
https://www.sourceware.org/ml/binutils/2016-05/msg00322.html
2016-06-28 Sriraman Tallam <tmsriram@google.com>
* x86_64.cc (Lazy_view): New class.
(can_convert_mov_to_lea): Templatize function. Make the function
check for appropriate relocation types and use the view parameter
to get section contents.
(can_convert_callq_to_direct): New function.
(Target_x86_64<size>::Scan::global): Refactor.
(Target_x86_64<size>::Relocate::relocate): Refactor. Change any indirect
call via GOT that can be converted.
* testsuite/Makefile.am (x86_64_indirect_call_to_direct.sh): New test.
* testsuite/Makefile.in: Regenerate.
* testsuite/x86_64_indirect_call_to_direct1.s: New file.
* testsuite/x86_64_indirect_jump_to_direct1.s: New file.
bfd * elfxx-sparc.c (_bfd_sparc_elf_relocate_section): Don't convert
R_SPARC_32 to R_SPARC_RELATIVE if class is ELFCLASS64.
gold * sparc.cc (Target_sparc::Scan::local): Don't convert R_SPARC_32
to R_SPARC_RELATIVE if class is ELFCLASS64.
(Target_sparc::Scan::global): Likewise.
ld * testsuite/ld-elf/symbolic-func.r: Allow non-zero offsets from
.text.
The fix for PR 15370 did not correctly check all patterns in a group,
but instead threw all unassigned sections into the group. This patch
fixes that.
2016-06-23 Cary Coutant <ccoutant@gmail.com>
Igor Kudrin <ikudrin@accesssoftek.com>
gold/
PR gold/15370
* script-sections.cc
(Output_section_element_input::set_section_addresses): Keep bin_count
separate from input_pattern_count.
* testsuite/script_test_12.t: Add another section .x4.
* testsuite/script_test_12i.t: Likewise.
* testsuite/script_test_12a.c: Likewise.
* testsuite/script_test_12b.c: Likewise.
Add a configure option --enable-relro to decide whether -z relro should
be enabled by default. Default to yes.
PR ld/20283
* NEWS: Mention --enable-relro.
* configure.ac: Add --enable-relro.
(DEFAULT_LD_Z_RELRO): New. Set by --enable-relro and default
to 1.
* config.in: Regenerated.
* configure: Likewise.
* options.h (General_options::relro): Default to
DEFAULT_LD_Z_RELRO.
If there is no PLT in output, return 0 for first_plt_entry_offset and
plt_entry_size.
PR gold/20245
* i386.cc (Target_i386::first_plt_entry_offset): Return 0 if
plt_ is NULL.
(Target_i386::plt_entry_size): Likewise.
(Target_x86_64<size>::first_plt_entry_offset): Likewise.
(Target_x86_64<size>::plt_entry_size): Likewise.
Includes DT_MIPS_RLD_MAP and DT_MIPS_RLD_MAP_REL dynamic tags and
__RLD_MAP symbol.
2016-06-20 Vladimir Radosavljevic <Vladimir.Radosavljevic@imgtec.com>
elfcpp/
* elfcpp.h (DT_MIPS_RLD_MAP_REL): New enum constant.
gold/
* mips.cc (Target_mips::Target_mips): Initialize rld_map_.
(Target_mips::rld_map_): New data member.
(Target_mips::do_finalize_sections): Add support for
DT_MIPS_RLD_MAP and DT_MIPS_RLD_MAP_REL dynamic tags,
.rld_map section, and __RLD_MAP symbol.
(Target_mips::do_dynamic_tag_custom_value): Add support for
DT_MIPS_RLD_MAP_REL dynamic tag.
* output.cc (Output_data_dynamic::get_entry_offset): New method
definition.
* output.h (Output_data_dynamic::get_entry_offset): New method
declaration.
elfcpp/
* mips.h (R_MIPS_PC21_S2, R_MIPS_PC26_S2, R_MIPS_PC18_S3,
R_MIPS_PC19_S2, R_MIPS_PCHI16, R_MIPS_PCLO16): New enums for
Mips32r6 and Mips64r6 relocations.
(r6_isa): New function.
gold/
* mips.cc (relocation_needs_la25_stub): Add support for relocs:
R_MIPS_PC21_S2 and R_MIPS_PC26_S2.
(hi16_reloc): Add support for R_MIPS_PCHI16 relocation.
(is_matching_lo16_reloc): Likewise.
(lo16_reloc): Add support for R_MIPS_PCLO16 relocation.
(Mips_output_data_plt::plt_entry_r6): New static data member for
R6 PLT entry.
(Target_mips::is_output_r6): New method.
(Target_mips::Mips_mach): Add new enum constants.
(Mips_relocate_functions::Status): Likewise.
(Mips_relocate_functions::pchi16_relocs): New static data member.
(Mips_relocate_functions::relpc21): New method.
(Mips_relocate_functions::relpc26): Likewise.
(Mips_relocate_functions::relpc18): Likewise.
(Mips_relocate_functions::relpc19): Likewise.
(Mips_relocate_functions::relpchi16): Likewise.
(Mips_relocate_functions::do_relpchi16): Likewise.
(Mips_relocate_functions::relpclo16): Likewise.
(Mips_output_data_plt::do_write): Add support for Mips r6 plt
entry.
(Target_mips::mips_32bit_flags): Add E_MIPS_ARCH_32R6 support.
(Target_mips::elf_mips_mach): Add E_MIPS_ARCH_32R6 and
E_MIPS_ARCH_64R6 support.
(Target_mips::update_abiflags_isa): Likewise.
(mips_get_size_for_reloc): Add support for relocs: R_MIPS_PCHI16,
R_MIPS_PCLO16, R_MIPS_PC21_S2, R_MIPS_PC26_S2, R_MIPS_PC18_S3 and
R_MIPS_PC19_S2.
(Target_mips::Scan::local): Add support for relocs: R_MIPS_PCHI16
and R_MIPS_PCLO16.
(Target_mips::Scan::global): Add support for relocs:
R_MIPS_PC21_S2 and R_MIPS_PC26_S2.
(Target_mips::Relocate::relocate): Call functions for resolving
Mips32r6 and Mips64r6 relocations, and print error message for
STATUS_PCREL_UNALIGNED.
(Target_mips::Scan::get_reference_flags): Add support for relocs:
R_MIPS_PCHI16, R_MIPS_PCLO16, R_MIPS_PC21_S2, R_MIPS_PC26_S2,
R_MIPS_PC18_S3 and R_MIPS_PC19_S2.
(Target_mips::elf_mips_mach_name): Add E_MIPS_ARCH_32R6 and
E_MIPS_ARCH_64R6 support.
The .got.plt section must be placed right after the .got section.
Otherwise, GOT offset will be wrong.
PR gold/20246
* testsuite/script_test_2.t: Add .got.plt after .got.
gold/
* mips.cc (Mips_relobj::Mips_relobj): Initialize
has_reginfo_section_.
(Mips_relobj::has_reginfo_section_): New data member.
(Mips_relobj::has_reginfo_section): New method.
(class Mips_output_section_reginfo): Change base class to
Output_section_data, and set masks of the output .reginfo section
in constructor.
(Mips_output_section_reginfo::as_mips_output_section_reginfo):
Remove.
(Mips_output_section_reginfo::set_masks): Likewise.
(Mips_output_section_reginfo::set_final_data_size): Likewise.
(Mips_output_section_reginfo::do_print_to_mapfile): New method.
(Target_mips::do_make_output_section): Remove.
(Mips_relobj::do_read_symbols): Set has_reginfo_section_ to true
if the object contains a .reginfo section.
(Target_mips::do_finalize_sections): Create a .reginfo output
section if needed.
* mips.cc (Mips_got_entry::Mips_got_entry): Remove object argument
for global got symbols, and set addend to 0.
(Mips_got_entry::hash): Change hash algorithm.
(Mips_got_entry::equals): Refactor.
(Mips_got_entry::object): Return input object for local got symbols
from union d.
(Mips_got_entry::addend): Change return of the relocation addend.
(Mips_got_entry::addend_): Move from union d.
(Mips_got_entry::object_): Move into union d.
(class Mips_symbol_hash): New class.
(Mips_got_info::Global_got_entry_set): New type.
(Mips_got_info::global_got_symbols): Change return type to
Global_got_entry_set.
(Mips_got_info::global_got_symbols_): Change type to
Global_got_entry_set.
(Mips_symbol::hash): New method.
(Mips_output_data_la25_stub::symbols_): Change type to std::vector.
(Mips_output_data_mips_stubs::Mips_stubs_entry_set): New type.
(Mips_output_data_mips_stubs::symbols_): Change type to
Mips_stubs_entry_set.
(Mips_got_info::record_global_got_symbol): Don't pass object
argument when creating global got symbol.
(Mips_got_info::record_got_entry): Remove find before inserting
got entries.
(Mips_got_info::add_reloc_only_entries): Change type of iterator
to Global_got_entry_set.
(Mips_got_info::count_got_symbols): Likewise.
(Mips_output_data_la25_stub::create_la25_stub): Use push_back
for adding entries to symbols_.
(Mips_output_data_la25_stub::do_write): Change type of iterator
to std::vector.
(Mips_output_data_mips_stubs::set_lazy_stub_offsets): Change type
of iterator to Mips_stubs_entry_set.
(Mips_output_data_mips_stubs::set_needs_dynsym_value): Likewise.
(Mips_output_data_mips_stubs::do_write): Likewise.
In PR 16979, a reference to malloc is being resolved to an unversioned
reference in libmalloc.so. When linked with --as-needed, however, the
dynamic table does not list libmalloc.so as a DT_NEEDED library.
If we have a reference to an unversioned symbol in a shared object,
and we later see a versioned definition in another shared object, we
were overriding the first definition with the second in the process of
defining the default version. As a result, we no longer think that the
first shared object was actually needed to resolve any symbols, and we
don't list it as a DT_NEEDED library.
This patch fixes the problem by treating the two definitions as separate
symbols, so the second definition does not override the first.
2016-03-30 Cary Coutant <ccoutant@gmail.com>
gold/
PR gold/16979
* symtab.cc (Symbol_table::define_default_version): Check for case
where symbols are both in different shared objects.
bfd * warning.m4 (GCC_WARN_CFLAGS): Only add -Wstack-usage if using a
sufficiently recent version of GCC.
* configure: Regenerate.
others * configure: Regenerate.
During LTO, if (1) an IR file contains a COMDAT group that is kept,
(2) a later non-claimed file contains the same group, which we discard,
and (3) the plugin fails to provide a definition of the symbols in that
COMDAT group, gold silently resolves any references to those symbols
to 0.
This patch adds a check for a placeholder symbol when deciding
whether to issue an undefined symbol error. It also adds an extra
note after any undefined placeholder symbol error that explains
that a definition was expected from the plugin.
gold/
PR gold/19842
* errors.cc (Errors::undefined_symbol): Add info message when
symbol should have been provided by a plugin.
* target-reloc.h (issue_undefined_symbol_error): Check for
placeholder symbols defined in discarded sections.
* testsuite/Makefile.am (plugin_test_9b): New test case.
* testsuite/Makefile.in: Regenerate.
* testsuite/plugin_test_9b_elf.cc: New test source file.
* testsuite/plugin_test_9b_ir.cc: New test source file.
When running ld -r on objects that have comdat groups, when gold
deduplicates a function in a comdat group, it removes the relocations
from the EH information that referred to the dropped copy of the function.
When running a final link using the result of the -r link, the missing
relocation cause it to fail to recognize the FDE for the dropped
function.
This patch improves gold's FDE scanning to take into account the
possibility that an FDE corresponds to a dropped function, and drops
that FDE as well.
Gnu ld, on the other hand, leaves the relocations in the ld -r output,
but makes them R_NONE with an r_sym field of 0. This was sufficient to
let both linkers recognize the FDE properly.
With this fix, if you do an ld -r with gold, then do the final link with
Gnu ld, the .eh_frame_hdr section will not be generated. To make it work
with Gnu ld, we would have to leave the R_NONE relocations in, but I
think it's better to drop the relocations entirely. I'd hope that if
you're doing a -r link with gold, you'll also do the final link with
gold.
gold/
PR gold/19002
* ehframe.cc (Eh_frame::read_fde): Check for dropped functions.
* testsuite/Makefile.am (eh_test_2): New test.
* testsuite/Makefile.in: Regenerate.
* testsuite/eh_test_2.sh: New test script.
* testsuite/eh_test_a.cc (bar): Make it comdat.
* testsuite/eh_test_b.cc (bar): Add a duplicate copy.
gold/
* mips.cc (enum Special_relocation_symbol): New enum type.
(is_readonly_section): New function.
(eh_reloc): Likewise.
(Mips_got_entry::is_section_symbol_): New member.
(Mips_got_entry::is_section_symbol): New method.
(Mips_got_info::record_local_got_symbol): Add is_section_symbol
argument.
(Mips_relobj::mips_elf_options_section_name): New method.
(Mips_output_data_got::record_local_got_symbol): Add
is_section_symbol argument, and pass it to
Mips_got_info::record_local_got_symbol.
(Mips_output_data_got::got_offset): Add addend argument, and pass
it to Relobj::local_got_offset.
(struct Mips_output_reloc_writer): New type.
(class Mips_output_data_reloc): New class.
(Mips_output_data_plt::Reloc_section): Change type to
Mips_output_data_reloc.
(Target_mips::Reloc_section): Likewise.
(Mips_reloc_types::get_r_addend): Remove unsigned from return type.
(Mips_classify_reloc::get_r_type2): New method.
(Mips_classify_reloc::get_r_type3): Likewise.
(Mips_classify_reloc::get_r_ssym): Likewise.
(Target_mips::Reloca_section): Remove.
(Relocate::should_apply_static_reloc): Rename from
should_apply_r_mips_32_reloc.
(Target_mips::copy_reloc): Replace Reltype parameter with r_type
and r_offset.
(Mips_relocate_functions::Valtype): New type.
(Mips_relocate_functions::Valtype64): New type.
(Mips_relocate_functions::check_overflow): New method.
(Mips_relocate_functions::mips_reloc_unshuffle): Move to public
interface.
(Mips_relocate_functions::mips_reloc_shuffle): Likewise.
(Mips_relocate_functions::rel16): Add support for resolving
relocations for Mips64.
(Mips_relocate_functions::rel32): Likewise.
(Mips_relocate_functions::reljalr): Likewise.
(Mips_relocate_functions::relpc32): Likewise.
(Mips_relocate_functions::rel26): Likewise.
(Mips_relocate_functions::relpc16): Likewise.
(Mips_relocate_functions::relmicromips_pc7_s1): Likewise.
(Mips_relocate_functions::relmicromips_pc10_s1): Likewise.
(Mips_relocate_functions::relmicromips_pc16_s1): Likewise.
(Mips_relocate_functions::do_relhi16): Likewise.
(Mips_relocate_functions::do_relgot16_local): Likewise.
(Mips_relocate_functions::rello16): Likewise.
(Mips_relocate_functions::relgot): Likewise.
(Mips_relocate_functions::relgotpage): Likewise.
(Mips_relocate_functions::relgotofst): Likewise.
(Mips_relocate_functions::relgot_hi16): Likewise.
(Mips_relocate_functions::relgot_lo16): Likewise.
(Mips_relocate_functions::relgprel): Likewise.
(Mips_relocate_functions::relgprel32): Likewise.
(Mips_relocate_functions::tlsrelhi16): Likewise.
(Mips_relocate_functions::tlsrello16): Likewise.
(Mips_relocate_functions::tlsrel32): Likewise.
(Mips_relocate_functions::relsub): Likewise.
(Mips_relocate_functions::releh): New method.
(Mips_relocate_functions::rel64): Likewise.
(Mips_got_info::record_local_got_symbol): Add is_section_symbol and
pass it to Mips_got_entry.
(Mips_got_info::add_local_entries): Pass addend argument
to code functions, and for STT_SECTION symbols call
add_symbolless_local_addend.
(Mips_got_info::add_tls_entries): Pass addend argument to code
functions.
(Mips_relobj::do_read_symbols): Read gp value that was used to
create object.
(Mips_output_data_plt::plt_entry): Remove opcode from l[wd]
instruction. Opcode for instruction will be selected later.
(Target_mips::gc_process_relocs): Add case for SHT_RELA.
(Target_mips::scan_relocatable_relocs): Likewise.
(Target_mips::emit_relocs_scan): Likewise.
(Target_mips::relocate_relocs): Likewise.
(Target_mips::do_finalize_sections): Skip objects for merging
processor specific flags in which all input sections will be
discarded.
(mips_get_size_for_reloc): Add case for R_MIPS_EH.
(Target_mips::Scan::get_reference_flags): Likewise.
(Target_mips::relocate_special_relocatable): Call rel26 method with
calculate_only and calculated_value arguments.
(Target_mips::Scan::local): Add case for R_MIPS_EH. Don't create a
dynamic relocation against a readonly sections, and pass
is_section_symbol to Mips_got_info::record_local_got_symbol.
(Target_mips::Scan::global): Add case for R_MIPS_EH. Don't create a
dynamic relocation against a readonly sections, and pass r_type
and r_offset to Target_mips::copy_reloc.
(Target_mips::Relocate::relocate): Add support for resolving
relocations for Mips64.
(Target_mips::mips_info): Add case for Mips64 default dynamic
linker name.
(Target_selector_mips): Correct emulation names.
G++ in GCC 4.2 silently ignores
---
__attribute__ ((section(".rodata.v1_a2")))
const short rodata_item1 = 101;
---
which leads to plugin_layout_with_alignment test failure with
Expected 12 sections, found 8 sections
since 4 .rodata sections are missing. As a workaround, this patch
changes plugin_layout_with_alignment test from C++ to C.
* testsuite/plugin_layout_with_alignment.cc: Renamed to ..
* testsuite/plugin_layout_with_alignment.c: This.
* testsuite/Makefile.am (plugin_layout_with_alignment.o): Updated.
(plugin_layout_with_alignment): Likewise.
* testsuite/Makefile.in: Regenerated.
GCC 6 does not generate constructors for two of gold's test cases.
This patch simply removes the checks for them.
gold/
PR 19751
* testsuite/Makefile.am (retain_symbols_file_test): Remove check
for constructor.
* testsuite/Makefile.in: Regenerate.
* testsuite/dynamic_list.sh: Likewise.
* testsuite/retain_symbols_file_test.sh: Likewise.
This patch is a simple refactoring that will allow the MIPS backend to
replace the Output_data_reloc_base::do_write() method without copying
its entire implementation. I've moved the implementation of do_write()
into a function template, which can be instantiated with a custom
class to write the MIPS-specific relocation format. The custom class
for MIPS needs access to the symbol index and address from
Output_reloc, so I've included the part of Vlad's MIPS-64 patch that
makes those accessor methods public.
2016-03-08 Cary Coutant <ccoutant@gmail.com>
Vladimir Radosavljevic <vladimir.radosavljevic@imgtec.com>
gold/
* output.cc (Output_reloc_writer): New type.
(Output_data_reloc_base::do_write): Move implementation to template
in output.h and replace with invocation of template.
* output.h (Output_file): Move to top of file.
(Output_reloc::get_symbol_index): Move to public interface.
(Output_reloc::get_address): Likewise.
(Output_data_reloc_base::do_write_generic): New function template.
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.
