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For ELF targets, section symbols are required only for relocations. With -ffunction-sections -fdata-sections, there can be many unused section symbols. Sizes of libstdc++.a on Linux/x86-64 in GCC 11 are With unused section symbols : 39411698 bytes Without unused section symbols: 39227002 bytes The unused section symbols in libstdc++.a occupy more than 180 KB. Add BSF_SECTION_SYM_USED to indicate if a section symbol should be included in the symbol table. The BSF_SECTION_SYM_USED should be set if the section symbol is used for relocation or the section symbol is always included in the symbol table. Add keep_unused_section_symbols to bfd_target to indicate if unused section symbols should be kept. If TARGET_KEEP_UNUSED_SECTION_SYMBOLS is defined as FALSE, unused ection symbols will be removed. Tested on Linux/x86. Other ELF backends need to: 1. Define TARGET_KEEP_UNUSED_SECTION_SYMBOLS to FALSE. 2. Mark used section symbols in assembler backend. 3. Remove unused section symbols from expected assembler and linker outputs. bfd/ PR 27109 * aix386-core.c (core_aix386_vec): Initialize keep_unused_section_symbol to TARGET_KEEP_UNUSED_SECTION_SYMBOLS. * aout-target.h (MY (vec)): Likewise. * binary.c (binary_vec): Likewise. * cisco-core.c (core_cisco_be_vec): Likewise. (core_cisco_le_vec): Likewise. * coff-alpha.c (alpha_ecoff_le_vec): Likewise. * coff-i386.c (TARGET_SYM): Likewise. (TARGET_SYM_BIG): Likewise. * coff-ia64.c (TARGET_SYM): Likewise. * coff-mips.c (mips_ecoff_le_vec): Likewise. (mips_ecoff_be_vec): Likewise. (mips_ecoff_bele_vec): Likewise. * coff-rs6000.c (rs6000_xcoff_vec): Likewise. (powerpc_xcoff_vec): Likewise. * coff-sh.c (sh_coff_small_vec): Likewise. (sh_coff_small_le_vec): Likewise. * coff-tic30.c (tic30_coff_vec): Likewise. * coff-tic54x.c (tic54x_coff0_vec): Likewise. (tic54x_coff0_beh_vec): Likewise. (tic54x_coff1_vec): Likewise. (tic54x_coff1_beh_vec): Likewise. (tic54x_coff2_vec): Likewise. (tic54x_coff2_beh_vec): Likewise. * coff-x86_64.c (TARGET_SYM): Likewise. (TARGET_SYM_BIG): Likewise. * coff64-rs6000.c (rs6000_xcoff64_vec): Likewise. (rs6000_xcoff64_aix_vec): Likewise. * coffcode.h (CREATE_BIG_COFF_TARGET_VEC): Likewise. (CREATE_BIGHDR_COFF_TARGET_VEC): Likewise. (CREATE_LITTLE_COFF_TARGET_VEC): Likewise. * elfxx-target.h (TARGET_BIG_SYM): Likewise. (TARGET_LITTLE_SYM): Likewise. * hppabsd-core.c (core_hppabsd_vec): Likewise. * hpux-core.c (core_hpux_vec): Likewise. * i386msdos.c (i386_msdos_vec): Likewise. * ihex.c (ihex_vec): Likewise. * irix-core.c (core_irix_vec): Likewise. * mach-o-target.c (TARGET_NAME): Likewise. * mmo.c (mmix_mmo_vec): Likewise. * netbsd-core.c (core_netbsd_vec): Likewise. * osf-core.c (core_osf_vec): Likewise. * pdp11.c (MY (vec)): Likewise. * pef.c (pef_vec): Likewise. (pef_xlib_vec): Likewise. * plugin.c (plugin_vec): Likewise. * ppcboot.c (powerpc_boot_vec): Likewise. * ptrace-core.c (core_ptrace_vec): Likewise. * sco5-core.c (core_sco5_vec): Likewise. * som.c (hppa_som_vec): Likewise. * srec.c (srec_vec): Likewise. (symbolsrec_vec): Likewise. * tekhex.c (tekhex_vec): Likewise. * trad-core.c (core_trad_vec): Likewise. * verilog.c (verilog_vec): Likewise. * vms-alpha.c (alpha_vms_vec): Likewise. * vms-lib.c (alpha_vms_lib_txt_vec): Likewise. * wasm-module.c (wasm_vec): Likewise. * xsym.c (sym_vec): Likewise. * elf.c (ignore_section_sym): Return TRUE if BSF_SECTION_SYM_USED isn't set. (elf_map_symbols): Don't include ignored section symbols. * elfcode.h (elf_slurp_symbol_table): Also set BSF_SECTION_SYM_USED on STT_SECTION symbols. * elflink.c (bfd_elf_final_link): Generated section symbols only when emitting relocations or reqired. * elfxx-x86.h (TARGET_KEEP_UNUSED_SECTION_SYMBOLS): New. * syms.c (BSF_SECTION_SYM_USED): New. * targets.c (TARGET_KEEP_UNUSED_SECTION_SYMBOLS): New. (bfd_target): Add keep_unused_section_symbols. (bfd_keep_unused_section_symbols): New. * bfd-in2.h: Regenerated. binutils/ PR 27109 * objcopy.c (copy_object): Handle section symbols for non-relocatable inputs. * testsuite/binutils-all/readelf.exp (readelf_test): Check is_elf_unused_section_symbols. * testsuite/binutils-all/readelf.s-64: Updated. * testsuite/binutils-all/readelf.ss: Likewise. * testsuite/binutils-all/readelf.ss-64: Likewise. * testsuite/binutils-all/readelf.s-64-unused: New file. * testsuite/binutils-all/readelf.ss-64-unused: Likewise. * testsuite/binutils-all/readelf.ss-unused: Likewise. * testsuite/lib/binutils-common.exp (is_elf_unused_section_symbols): New proc. gas/ChangeLog: PR 27109 * read.c (s_reloc): Call symbol_mark_used_in_reloc on the section symbol. * subsegs.c (subseg_set_rest): Set BSF_SECTION_SYM_USED if needed. * write.c (adjust_reloc_syms): Call symbol_mark_used_in_reloc on the section symbol. (set_symtab): Don't generate unused section symbols. (maybe_generate_build_notes): Call symbol_mark_used_in_reloc on the section symbol. * config/obj-elf.c (elf_adjust_symtab): Call symbol_mark_used_in_reloc on the group signature symbol. * testsuite/gas/cfi/cfi-label.d: Remove unused section symbols from expected output. * testsuite/gas/elf/elf.exp (run_elf_list_test): Check is_elf_unused_section_symbols. * testsuite/gas/elf/section2.e: Updated. * testsuite/gas/elf/section2.e-unused: New file. * testsuite/gas/elf/symver.d: Remove unused section symbols. * testsuite/gas/i386/ilp32/elf/symver.d: Likewise. * testsuite/gas/i386/ilp32/x86-64-size-1.d: Likewise. * testsuite/gas/i386/ilp32/x86-64-size-3.d: Likewise. * testsuite/gas/i386/ilp32/x86-64-size-5.d: Likewise. * testsuite/gas/i386/ilp32/x86-64-unwind.d: Likewise. * testsuite/gas/i386/size-1.d: Likewise. * testsuite/gas/i386/size-3.d: Likewise. * testsuite/gas/i386/svr4.d: Likewise. * testsuite/gas/i386/x86-64-size-1.d: Likewise. * testsuite/gas/i386/x86-64-size-3.d: Likewise. * testsuite/gas/i386/x86-64-size-5.d: Likewise. * testsuite/gas/i386/x86-64-unwind.d: Likewise. ld/ PR 27109 * testsuite/ld-elf/export-class.sd: Adjust the expected output. * testsuite/ld-elf/loadaddr3b.d: Likewise. * testsuite/ld-i386/ibt-plt-1.d: Likewise. * testsuite/ld-i386/ibt-plt-2a.d: Likewise. * testsuite/ld-i386/ibt-plt-2c.d: Likewise. * testsuite/ld-i386/ibt-plt-3a.d: Likewise. * testsuite/ld-i386/ibt-plt-3c.d: Likewise. * testsuite/ld-i386/pr19636-1d.d: Likewise. * testsuite/ld-i386/pr19636-1l.d: Likewise. * testsuite/ld-i386/pr19636-2c.d: Likewise. * testsuite/ld-ifunc/ifunc-2-i386-now.d: Likewise. * testsuite/ld-ifunc/ifunc-2-local-i386-now.d: Likewise. * testsuite/ld-ifunc/ifunc-2-local-x86-64-now.d: Likewise. * testsuite/ld-ifunc/ifunc-2-x86-64-now.d: Likewise. * testsuite/ld-ifunc/ifunc-21-x86-64.d: Likewise. * testsuite/ld-ifunc/ifunc-22-x86-64.d: Likewise. * testsuite/ld-ifunc/pr17154-i386-now.d: Likewise. * testsuite/ld-ifunc/pr17154-i386.d: Likewise. * testsuite/ld-ifunc/pr17154-x86-64-now.d: Likewise. * testsuite/ld-ifunc/pr17154-x86-64.d: Likewise. * testsuite/ld-x86-64/bnd-branch-1-now.d: Likewise. * testsuite/ld-x86-64/bnd-ifunc-1-now.d: Likewise. * testsuite/ld-x86-64/bnd-ifunc-2-now.d: Likewise. * testsuite/ld-x86-64/bnd-ifunc-2.d: Likewise. * testsuite/ld-x86-64/bnd-plt-1-now.d: Likewise. * testsuite/ld-x86-64/bnd-plt-1.d: Likewise. * testsuite/ld-x86-64/ibt-plt-1-x32.d: Likewise. * testsuite/ld-x86-64/ibt-plt-1.d: Likewise. * testsuite/ld-x86-64/ibt-plt-2a-x32.d: Likewise. * testsuite/ld-x86-64/ibt-plt-2a.d: Likewise. * testsuite/ld-x86-64/ibt-plt-2c-x32.d: Likewise. * testsuite/ld-x86-64/ibt-plt-2c.d: Likewise. * testsuite/ld-x86-64/ibt-plt-3a-x32.d: Likewise. * testsuite/ld-x86-64/ibt-plt-3a.d: Likewise. * testsuite/ld-x86-64/ibt-plt-3c-x32.d: Likewise. * testsuite/ld-x86-64/ibt-plt-3c.d: Likewise. * testsuite/ld-x86-64/pr19609-4e.d: Likewise. * testsuite/ld-x86-64/pr19609-6a.d: Likewise. * testsuite/ld-x86-64/pr19609-6b.d: Likewise. * testsuite/ld-x86-64/pr19609-7b.d: Likewise. * testsuite/ld-x86-64/pr19609-7d.d: Likewise. * testsuite/ld-x86-64/pr19636-2l.d: Likewise. * testsuite/ld-x86-64/pr20253-1d.d: Likewise. * testsuite/ld-x86-64/pr20253-1h.d: Likewise. * testsuite/ld-x86-64/pr21038b-now.d: Likewise. * testsuite/ld-x86-64/pr21038b.d: Likewise. * testsuite/ld-x86-64/pr21038c-now.d: Likewise. * testsuite/ld-x86-64/pr21038c.d: Likewise. * testsuite/ld-x86-64/pr23854.d: Likewise. * testsuite/ld-x86-64/pr25416-3.d: Likewise. * testsuite/ld-x86-64/pr25416-4.d: Likewise. * testsuite/ld-i386/plt-pic.pd: Likewise. * testsuite/ld-i386/plt-pic2.dd: Likewise. * testsuite/ld-i386/plt.pd: Likewise. * testsuite/ld-i386/plt2.dd: Likewise. * testsuite/ld-i386/tlsbin.rd: Likewise. * testsuite/ld-i386/tlsbin2.rd: Likewise. * testsuite/ld-i386/tlsbindesc.rd: Likewise. * testsuite/ld-i386/tlsdesc.rd: Likewise. * testsuite/ld-i386/tlsgdesc.rd: Likewise. * testsuite/ld-i386/tlsnopic.rd: Likewise. * testsuite/ld-i386/tlspic.rd: Likewise. * testsuite/ld-i386/tlspic2.rd: Likewise. * testsuite/ld-x86-64/mpx3.dd: Likewise. * testsuite/ld-x86-64/mpx3n.dd: Likewise. * testsuite/ld-x86-64/mpx4.dd: Likewise. * testsuite/ld-x86-64/mpx4n.dd: Likewise. * testsuite/ld-x86-64/pe-x86-64-1.od: Likewise. * testsuite/ld-x86-64/pe-x86-64-2.od: Likewise. * testsuite/ld-x86-64/pe-x86-64-3.od: Likewise. * testsuite/ld-x86-64/pe-x86-64-4.od: Likewise. * testsuite/ld-x86-64/plt.pd: Likewise. * testsuite/ld-x86-64/plt2.dd: Likewise. * testsuite/ld-x86-64/tlsbin.rd: Likewise. * testsuite/ld-x86-64/tlsbin2.rd: Likewise. * testsuite/ld-x86-64/tlsbindesc.rd: Likewise. * testsuite/ld-x86-64/tlsdesc.rd: Likewise. * testsuite/ld-x86-64/tlsgdesc.rd: Likewise. * testsuite/ld-x86-64/tlspic.rd: Likewise. * testsuite/ld-x86-64/tlspic2.rd: Likewise. * testsuite/ld-elf/sec64k.exp: Check is_elf_unused_section_symbols.
225 lines
6.9 KiB
Plaintext
225 lines
6.9 KiB
Plaintext
# Expect script for tests for >64k sections
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# Copyright (C) 2002-2021 Free Software Foundation, Inc.
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#
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# This file is part of the GNU Binutils.
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#
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# This program is free software; you can redistribute it and/or modify
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# it under the terms of the GNU General Public License as published by
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# the Free Software Foundation; either version 3 of the License, or
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# (at your option) any later version.
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#
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# This program is distributed in the hope that it will be useful,
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# but WITHOUT ANY WARRANTY; without even the implied warranty of
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# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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# GNU General Public License for more details.
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#
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# You should have received a copy of the GNU General Public License
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# along with this program; if not, write to the Free Software
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# Foundation, Inc., 51 Franklin Street - Fifth Floor, Boston,
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# MA 02110-1301, USA.
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#
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# Written by Hans-Peter Nilsson (hp@axis.com)
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#
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# Exclude non-ELF targets.
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if ![is_elf_format] {
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return
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}
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# Targets using _bfd_generic_final_link don't sort section symbols
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# before local symbols, so don't bother testing them.
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if { [is_generic] } {
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return
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}
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# ft32, h8300, ip2k, m68hc11 and m68hc12 run out of address space.
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if {[istarget "ft32-*-*"]
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|| [istarget "h8300-*-*"]
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|| [istarget "ip2k-*-*"]
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|| [istarget "m68hc1*-*"] } {
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return
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}
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# Test >64k sections, with and without -r. First, create the assembly
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# files. Have a relocation to another section and one within the local
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# section.
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set test1 "64ksec-r"
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set test2 "64ksec"
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if { ![runtest_file_p $runtests $test1] \
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&& ![runtest_file_p $runtests $test2] } {
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return
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}
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set sfiles {}
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set max_sec 66000
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set secs_per_file 1000
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for { set i 0 } { $i < $max_sec / $secs_per_file } { incr i } {
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set sfile "./tmpdir/sec64-$i.s"
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lappend sfiles $sfile
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if [catch { set ofd [open $sfile w] } x] {
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perror "$x"
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unresolved $test1
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unresolved $test2
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return
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}
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if { $i == 0 } {
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puts $ofd " .global start"
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puts $ofd "start:"
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puts $ofd " .global _start"
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puts $ofd "_start:"
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puts $ofd " .global __start"
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puts $ofd "__start:"
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puts $ofd " .global main"
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puts $ofd "main:"
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puts $ofd " .global _main"
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puts $ofd "_main:"
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puts $ofd " .global foo_0"
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puts $ofd "foo_0: .dc.a 0"
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}
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# Make sure the used section is not covered by common linker scripts.
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# They should get separate section entries even without -r.
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puts $ofd " .altmacro"
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puts $ofd " .macro sec secn, secp"
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if {![istarget "frv-*-*linux*"]} then {
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puts $ofd " .section .foo.\\secn,\"ax\""
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} else {
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puts $ofd " .section .foo.\\secn,\"aw\""
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}
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puts $ofd " .global foo_\\secn"
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puts $ofd "foo_\\secn:"
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puts $ofd " .dc.a foo_\\secp"
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puts $ofd "bar_\\secn:"
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puts $ofd " .dc.a bar_\\secn"
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puts $ofd " .endm"
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if {![istarget "bfin-*-*"]} then {
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puts $ofd " secn = [expr $i * $secs_per_file]"
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} else {
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puts $ofd " .set secn, [expr $i * $secs_per_file]"
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}
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puts $ofd " .rept $secs_per_file"
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if {![istarget "bfin-*-*"]} then {
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puts $ofd " secn = secn + 1"
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} else {
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puts $ofd " .set secn, secn + 1"
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}
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puts $ofd " sec %(secn), %(secn-1)"
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puts $ofd " .endr"
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close $ofd
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}
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if [catch { set ofd [open "tmpdir/$test1.d" w] } x] {
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perror "$x"
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unresolved $test1
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unresolved $test2
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return
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}
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# The ld-r linked file will contain relocation-sections too, so make it
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# half the size in order to try and keep the test-time down.
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# The m32r target generates both REL and RELA relocs (for historical
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# reasons) so the expected number of sections will be much more than
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# 68000, which throws this particular test right off.
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if { ![istarget "m32r-*-*"] } then {
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foreach sfile [lrange $sfiles 0 [expr [llength $sfiles] / 2]] {
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puts $ofd "#source: $sfile"
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}
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#force z80 target to compile for eZ80 in ADL mode
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if { [istarget "z80-*-*"] } then {
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puts $ofd "#as: -ez80-adl"
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}
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puts $ofd "#ld: -r"
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puts $ofd "#readelf: -W -Ss"
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puts $ofd "There are 680.. section headers.*:"
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puts $ofd "#..."
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puts $ofd " \\\[ 0\\\] .* 680\[0-9\]\[0-9\]\[ \]+0\[ \]+0"
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puts $ofd "#..."
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puts $ofd " \\\[ \[0-9\]\\\] \.foo\.1\[ \]+PROGBITS\[ \]+.*"
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puts $ofd "#..."
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puts $ofd " \\\[65279\\\] (.rel\[a\]?)?\\.foo\\.\[0-9\]+ .*"
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puts $ofd " \\\[65280\\\] (.rel\[a\]?)?\\.foo\\.\[0-9\]+ .*"
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puts $ofd "#..."
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puts $ofd " 340..: 0+\[ \]+0\[ \]+SECTION\[ \]+LOCAL\[ \]+DEFAULT\[ \]+68... .*"
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puts $ofd "#..."
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puts $ofd " 340..: 0+(2|4|8)\[ \]+0\[ \]+NOTYPE\[ \]+LOCAL\[ \]+DEFAULT\[ \]+\[2-7\] bar_1$"
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puts $ofd "#..."
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puts $ofd ".* bar_34000$"
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puts $ofd "#..."
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# Global symbols are not in "alphanumeric" order, so we just check
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# that the first and the last are present in any order (assuming no
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# duplicates).
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puts $ofd ".* (\[0-9\] foo_1|68... foo_34000)$"
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puts $ofd "#..."
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puts $ofd ".* (\[0-9\] foo_1|68... foo_34000)$"
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puts $ofd "#pass"
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close $ofd
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run_dump_test "tmpdir/$test1"
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}
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if [catch { set ofd [open "tmpdir/$test2.d" w] } x] {
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perror "$x"
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unresolved $test2
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return
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}
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# too big for avr, d10v and msp
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# lack of fancy orphan section handling causes overlap on fr30 and iq2000
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# lm32 complains about relocations in read-only sections
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if { ![istarget "d10v-*-*"]
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&& ![istarget "avr-*-*"]
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&& ![istarget "msp*-*-*"]
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&& ![istarget "fr30-*-*"]
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&& ![istarget "iq2000-*-*"]
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&& ![istarget "lm32-*-linux*"]
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&& ![istarget "pru-*-*"] } {
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foreach sfile $sfiles { puts $ofd "#source: $sfile" }
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if { [istarget spu*-*-*] } {
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puts $ofd "#ld: --local-store 0:0"
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} elseif { [istarget "i?86-*-linux*"] || [istarget "x86_64-*-linux*"] } {
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puts $ofd "#ld: -z noseparate-code"
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} else {
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puts $ofd "#ld:"
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}
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#force z80 target to compile for eZ80 in ADL mode
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if { [istarget "z80-*-*"] } then {
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puts $ofd "#as: -ez80-adl"
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}
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puts $ofd "#readelf: -W -Ss"
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puts $ofd "There are 660.. section headers.*:"
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puts $ofd "#..."
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puts $ofd " \\\[ 0\\\] .* 660..\[ \]+0\[ \]+0"
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puts $ofd "#..."
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puts $ofd " \\\[65279\\\] \\.foo\\.\[0-9\]+ .*"
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puts $ofd " \\\[65280\\\] \\.foo\\.\[0-9\]+ .*"
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puts $ofd "#..."
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if { [is_elf_unused_section_symbols ] } {
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puts $ofd " 660..: \[0-9a-f\]+\[ \]+0\[ \]+SECTION\[ \]+LOCAL\[ \]+DEFAULT\[ \]+660.. "
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puts $ofd "#..."
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puts $ofd " 660..: \[0-9a-f\]+\[ \]+0\[ \]+NOTYPE\[ \]+LOCAL\[ \]+DEFAULT\[ \]+\[0-9\] bar_1$"
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puts $ofd "#..."
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puts $ofd ".* bar_66000$"
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} else {
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puts $ofd " 66...: \[0-9a-f\]+\[ \]+0\[ \]+NOTYPE\[ \]+LOCAL\[ \]+DEFAULT\[ \]+660.. bar_66000$"
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}
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puts $ofd "#..."
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# Global symbols are not in "alphanumeric" order, so we just check
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# that the first and the last are present in any order (assuming no
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# duplicates).
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puts $ofd ".* (\[0-9\] foo_1|66... foo_66000)$"
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puts $ofd "#..."
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puts $ofd ".* (\[0-9\] foo_1|66... foo_66000)$"
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puts $ofd "#pass"
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close $ofd
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run_dump_test "tmpdir/$test2"
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}
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for { set i 1 } { $i < $max_sec / $secs_per_file } { incr i } {
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catch "exec rm -f tmpdir/dump$i.o" status
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}
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