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Re: [PATCH 1/2] MIPS: Compressed PLT/stubs support
- From: Richard Sandiford <rdsandiford at googlemail dot com>
- To: "Maciej W. Rozycki" <macro at codesourcery dot com>
- Cc: Joel Brobecker <brobecker at adacore dot com>, Catherine Moore <clm at codesourcery dot com>, <binutils at sourceware dot org>, <gdb-patches at sourceware dot org>
- Date: Mon, 10 Jun 2013 19:01:18 +0100
- Subject: Re: [PATCH 1/2] MIPS: Compressed PLT/stubs support
- References: <alpine dot DEB dot 1 dot 10 dot 1302072108300 dot 6762 at tp dot orcam dot me dot uk> <87621mwt3l dot fsf at talisman dot default> <alpine dot DEB dot 1 dot 10 dot 1303010513590 dot 6762 at tp dot orcam dot me dot uk> <87ehfozyhg dot fsf at talisman dot default> <alpine dot DEB dot 1 dot 10 dot 1306071534070 dot 16287 at tp dot orcam dot me dot uk> <8761xo981a dot fsf at talisman dot default> <alpine dot DEB dot 1 dot 10 dot 1306101743550 dot 16287 at tp dot orcam dot me dot uk>
"Maciej W. Rozycki" <macro@codesourcery.com> writes:
> 2013-06-10 Maciej W. Rozycki <macro@codesourcery.com>
>
> bfd/
> * elfxx-mips.h (_bfd_mips_elf_get_synthetic_symtab): New
> prototype.
> * elf32-mips.c (elf_backend_plt_sym_val): Remove macro.
> (bfd_elf32_get_synthetic_symtab): New macro.
> * elfxx-mips.c (plt_entry): New structure.
> (mips_elf_link_hash_entry): Add use_plt_entry member.
> (mips_elf_link_hash_table): Rename plt_entry_size member to
> plt_mips_entry_size. Add plt_comp_entry_size, plt_mips_offset,
> plt_comp_offset, plt_got_index entries and plt_header_is_comp
> members.
> (STUB_LW_MICROMIPS, STUB_MOVE_MICROMIPS): New macros.
> (STUB_LUI_MICROMIPS, STUB_JALR_MICROMIPS): Likewise.
> (STUB_ORI_MICROMIPS, STUB_LI16U_MICROMIPS): Likewise.
> (STUB_LI16S_MICROMIPS): Likewise.
> (MICROMIPS_FUNCTION_STUB_NORMAL_SIZE): Likewise.
> (MICROMIPS_FUNCTION_STUB_BIG_SIZE): Likewise.
> (micromips_o32_exec_plt0_entry): New variable.
> (mips16_o32_exec_plt_entry): Likewise.
> (micromips_o32_exec_plt_entry): Likewise.
> (mips_elf_link_hash_newfunc): Initialize use_plt_entry.
> (mips_elf_output_extsym): Update to use gotplt_union's plist
> member rather than offset.
> (mips_elf_gotplt_index): Likewise. Remove the VxWorks
> restriction. Use MIPS_ELF_GOT_SIZE to calculate GOT address.
> (mips_elf_count_got_symbols): Update to use gotplt_union's plist
> member rather than offset.
> (mips_elf_calculate_relocation): Handle MIPS16/microMIPS PLT
> entries.
> (_bfd_mips_elf_create_dynamic_sections): Don't set PLT sizes
> here.
> (mips_elf_make_plt_record): New function.
> (_bfd_mips_elf_check_relocs): Update comment. Record occurences
> of JAL relocations that might need a PLT entry.
> (_bfd_mips_elf_adjust_dynamic_symbol): Update to use
> gotplt_union's plist member rather than offset. Set individual
> PLT entry sizes here. Handle MIPS16/microMIPS PLT entries.
> Don't set the symbol's value in the symbol table for PLT
> references here. Don't set the PLT or PLT GOT section sizes
> here.
> (mips_elf_estimate_stub_size): Handle microMIPS stubs.
> (mips_elf_allocate_lazy_stub): Likewise.
> (mips_elf_lay_out_lazy_stubs): Likewise. Define a _MIPS_STUBS_
> magic symbol.
> (mips_elf_set_plt_sym_value): New function.
> (_bfd_mips_elf_size_dynamic_sections): Set PLT header size and
> PLT and PLT GOT section sizes here. Set the symbol values in
> the symbol table for PLT references here. Handle microMIPS
> annotation of the _PROCEDURE_LINKAGE_TABLE_ magic symbol.
> (_bfd_mips_elf_finish_dynamic_symbol): Update to use
> gotplt_union's plist member rather than offset. Handle
> MIPS16/microMIPS PLT entries. Handle microMIPS stubs.
> (_bfd_mips_vxworks_finish_dynamic_symbol): Update to use
> gotplt_union's plist member rather than offset. Use
> MIPS_ELF_GOT_SIZE to calculate GOT address.
> (mips_finish_exec_plt): Handle microMIPS PLT. Return status.
> (_bfd_mips_elf_finish_dynamic_sections): Handle result from
> mips_finish_exec_plt.
> (_bfd_mips_elf_link_hash_table_create): Update to use
> gotplt_union's plist member rather than offset.
> (_bfd_mips_elf_get_synthetic_symtab): New function.
>
> include/elf/
> * mips.h (ELF_ST_IS_MIPS_PLT): Respect STO_MIPS16 setting.
> (ELF_ST_SET_MIPS_PLT): Likewise.
>
> gdb/
> * mips-tdep.c (mips_elf_make_msymbol_special): Handle MIPS16 and
> microMIPS synthetic symbols.
>
> ld/
> * emulparams/elf32btsmip.sh: Arrange for .got.plt to be placed
> as close to .plt as possible.
> * scripttempl/elf.sc: Handle $INITIAL_READWRITE_SECTIONS and
> $PLT_NEXT_DATA variables.
>
> ld/testsuite/
> * ld-mips-elf/jalx-2.dd: Update for microMIPS PLT support.
> * ld-mips-elf/pic-and-nonpic-3a.dd: Update for the _MIPS_STUBS_
> magic symbol.
> * ld-mips-elf/pic-and-nonpic-3b.dd: Likewise.
> * ld-mips-elf/pic-and-nonpic-6-n32.dd: Likewise.
> * ld-mips-elf/pic-and-nonpic-6-n64.dd: Likewise.
> * ld-mips-elf/pic-and-nonpic-6-o32.dd: Likewise.
> * ld-mips-elf/stub-dynsym-1-10000.d: Likewise.
> * ld-mips-elf/stub-dynsym-1-2fe80.d: Likewise.
> * ld-mips-elf/stub-dynsym-1-7fff.d: Likewise.
> * ld-mips-elf/stub-dynsym-1-8000.d: Likewise.
> * ld-mips-elf/stub-dynsym-1-fff0.d: Likewise.
> * ld-mips-elf/tlslib-o32.d: Likewise.
>
> opcodes/
> * mips-dis.c (is_mips16_plt_tail): New function.
> (print_insn_mips16): Handle MIPS16 PLT entry's GOT slot address
> word.
> (is_compressed_mode_p): Handle MIPS16/microMIPS PLT entries.
OK for the binutils bits.
Thanks,
Richard