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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.
125 lines
4.1 KiB
R
125 lines
4.1 KiB
R
#source: tlspic1.s
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#source: tlspic2.s
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#as: --64
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#ld: -shared -melf_x86_64 --no-ld-generated-unwind-info
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#readelf: -WSsrl
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#target: x86_64-*-*
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There are [0-9]+ section headers, starting at offset 0x[0-9a-f]+:
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Section Headers:
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+\[Nr\] Name +Type +Address +Off +Size +ES Flg Lk Inf Al
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+\[[ 0-9]+\] +NULL +0+ 0+ 0+ 00 +0 +0 +0
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+\[[ 0-9]+\] .hash +.*
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+\[[ 0-9]+\] .dynsym +.*
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+\[[ 0-9]+\] .dynstr +.*
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+\[[ 0-9]+\] .rela.dyn +.*
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+\[[ 0-9]+\] .rela.plt +.*
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+\[[ 0-9]+\] .plt +.*
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+\[[ 0-9]+\] .text +PROGBITS +0+1000 0+1000 0+31a 00 +AX +0 +0 4096
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+\[[ 0-9]+\] .tdata +PROGBITS +0+20131a 0+131a 0+60 00 WAT +0 +0 +1
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+\[[ 0-9]+\] .tbss +NOBITS +0+20137a 0+137a 0+20 00 WAT +0 +0 +1
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+\[[ 0-9]+\] .dynamic +DYNAMIC +0+201380 0+1380 0+130 10 +WA +3 +0 +8
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+\[[ 0-9]+\] .got +PROGBITS +0+2014b0 0+14b0 0+90 08 +WA +0 +0 +8
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+\[[ 0-9]+\] .got.plt +PROGBITS +0+201540 0+1540 0+20 08 +WA +0 +0 +8
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+\[[ 0-9]+\] .symtab +.*
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+\[[ 0-9]+\] .strtab +.*
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+\[[ 0-9]+\] .shstrtab +.*
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Key to Flags:
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#...
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Elf file type is DYN \(Shared object file\)
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Entry point 0x1000
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There are [0-9]+ program headers, starting at offset [0-9]+
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Program Headers:
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+Type +Offset +VirtAddr +PhysAddr +FileSiz +MemSiz +Flg Align
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+LOAD +0x0+ 0x0+ 0x0+ 0x[0-9a-f]+ 0x[0-9a-f]+ R E 0x200000
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+LOAD +0x0+131a 0x0+20131a 0x0+20131a 0x0+246 0x0+246 RW +0x200000
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+DYNAMIC +0x0+1380 0x0+201380 0x0+201380 0x0+130 0x0+130 RW +0x8
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+TLS +0x0+131a 0x0+20131a 0x0+20131a 0x0+60 0x0+80 R +0x1
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Section to Segment mapping:
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+Segment Sections...
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+00 +.hash .dynsym .dynstr .rela.dyn .rela.plt .plt .text *
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+01 +.tdata .dynamic .got .got.plt *
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+02 +.dynamic *
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+03 +.tdata .tbss *
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Relocation section '.rela.dyn' at offset 0x[0-9a-f]+ contains 14 entries:
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+Offset +Info +Type +Symbol's Value +Symbol's Name \+ Addend
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[0-9a-f ]+R_X86_64_DTPMOD64 +0
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[0-9a-f ]+R_X86_64_TPOFF64 +24
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[0-9a-f ]+R_X86_64_TPOFF64 +30
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[0-9a-f ]+R_X86_64_DTPMOD64 +0
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[0-9a-f ]+R_X86_64_DTPMOD64 +0
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[0-9a-f ]+R_X86_64_TPOFF64 +64
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[0-9a-f ]+R_X86_64_TPOFF64 +50
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[0-9a-f ]+R_X86_64_TPOFF64 +70
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[0-9a-f ]+R_X86_64_DTPMOD64 +0
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[0-9a-f ]+R_X86_64_TPOFF64 +44
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[0-9a-f ]+R_X86_64_TPOFF64 +0+10 sg5 \+ 0
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[0-9a-f ]+R_X86_64_DTPMOD64 +0+ sg1 \+ 0
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[0-9a-f ]+R_X86_64_DTPOFF64 +0+ sg1 \+ 0
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[0-9a-f ]+R_X86_64_TPOFF64 +0+4 sg2 \+ 0
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Relocation section '.rela.plt' at offset 0x[0-9a-f]+ contains 1 entry:
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+Offset +Info +Type +Symbol's Value +Symbol's Name \+ Addend
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[0-9a-f ]+R_X86_64_JUMP_SLOT +0+ __tls_get_addr \+ 0
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Symbol table '\.dynsym' contains [0-9]+ entries:
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+Num: +Value +Size +Type +Bind +Vis +Ndx +Name
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.* NOTYPE +LOCAL +DEFAULT +UND *
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.* TLS +GLOBAL +DEFAULT +8 sg8
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.* TLS +GLOBAL +DEFAULT +8 sg3
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.* TLS +GLOBAL +DEFAULT +8 sg4
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.* TLS +GLOBAL +DEFAULT +8 sg5
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.* NOTYPE +GLOBAL +DEFAULT +UND __tls_get_addr
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.* TLS +GLOBAL +DEFAULT +8 sg1
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.* FUNC +GLOBAL +DEFAULT +7 fn1
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.* TLS +GLOBAL +DEFAULT +8 sg2
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.* TLS +GLOBAL +DEFAULT +8 sg6
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.* TLS +GLOBAL +DEFAULT +8 sg7
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Symbol table '\.symtab' contains [0-9]+ entries:
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+Num: +Value +Size +Type +Bind +Vis +Ndx +Name
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.* NOTYPE +LOCAL +DEFAULT +UND *
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.* FILE +LOCAL +DEFAULT +ABS .*tlspic1.o
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.* TLS +LOCAL +DEFAULT +8 sl1
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.* TLS +LOCAL +DEFAULT +8 sl2
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.* TLS +LOCAL +DEFAULT +8 sl3
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.* TLS +LOCAL +DEFAULT +8 sl4
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.* TLS +LOCAL +DEFAULT +8 sl5
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.* TLS +LOCAL +DEFAULT +8 sl6
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.* TLS +LOCAL +DEFAULT +8 sl7
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.* TLS +LOCAL +DEFAULT +8 sl8
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.* FILE +LOCAL +DEFAULT +ABS
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.* TLS +LOCAL +DEFAULT +9 sH1
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.* OBJECT +LOCAL +DEFAULT +10 _DYNAMIC
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.* TLS +LOCAL +DEFAULT +8 sh3
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.* TLS +LOCAL +DEFAULT +9 sH2
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.* TLS +LOCAL +DEFAULT +9 sH7
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.* TLS +LOCAL +DEFAULT +8 sh7
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.* TLS +LOCAL +DEFAULT +8 sh8
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.* TLS +LOCAL +DEFAULT +9 sH4
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.* TLS +LOCAL +DEFAULT +8 sh4
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.* TLS +LOCAL +DEFAULT +9 sH3
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.* TLS +LOCAL +DEFAULT +8 sh5
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.* TLS +LOCAL +DEFAULT +9 sH5
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.* TLS +LOCAL +DEFAULT +9 sH6
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.* TLS +LOCAL +DEFAULT +9 sH8
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.* TLS +LOCAL +DEFAULT +8 sh1
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.* OBJECT +LOCAL +DEFAULT +12 _GLOBAL_OFFSET_TABLE_
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.* TLS +LOCAL +DEFAULT +8 sh2
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.* TLS +LOCAL +DEFAULT +8 sh6
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.* TLS +GLOBAL +DEFAULT +8 sg8
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.* TLS +GLOBAL +DEFAULT +8 sg3
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.* TLS +GLOBAL +DEFAULT +8 sg4
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.* TLS +GLOBAL +DEFAULT +8 sg5
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.* NOTYPE +GLOBAL +DEFAULT +UND __tls_get_addr
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.* TLS +GLOBAL +DEFAULT +8 sg1
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.* FUNC +GLOBAL +DEFAULT +7 fn1
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.* TLS +GLOBAL +DEFAULT +8 sg2
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.* TLS +GLOBAL +DEFAULT +8 sg6
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.* TLS +GLOBAL +DEFAULT +8 sg7
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