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5 Commits
| Author | SHA1 | Message | Date | |
|---|---|---|---|---|
H.J. Lu
|
d1bcae833b |
ELF: Don't generate unused section symbols
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. |
||
Jan Beulich
|
36938cabf0 |
x86: avoid attaching suffixes to unambiguous insns
"Unambiguous" is is in particular taking as reference the assembler, which also accepts certain insns - despite them allowing for varying operand size, and hence in principle being ambiguous - without any suffix. For example, from the very beginning of the life of x86-64 I had trouble understanding why a plain and simple RET had to be printed as RETQ. In case someone really used the 16-bit form, RETW disambiguates the two quite fine. |
||
Alan Modra
|
fd161d860f |
Define various symbols conditionally in shared libraries
The values of symbols in shared libraries like _end, _edata, and __bss_start are generally not that useful outside of the shared library. This patch defines them conditionally with PROVIDE, since a shared library might need the local value. An example is glibc ld.so local access to "_begin", "_etext" and "_end". (ld.so gains access to the local values by making the references using hidden visibility. That makes the definitions hidden too.) We can't use PROVIDE_HIDDEN in the linker scripts because the shared library might need the value of the symbol in the executable. An example is freebsd libc dynamic access to "_end". PR ld/23161 * emulparams/aarch64cloudabi.sh: PROVIDE __bss_start__, _bss_end__, and __end__ in shared libraries. * emulparams/aarch64fbsd.sh: Likewise. * emulparams/aarch64linux.sh: Likewise. * emulparams/aarch64linux32.sh: Likewise. * emulparams/armelf_fuchsia.sh: Likewise. * emulparams/armelf_linux.sh: Likewise. * emulparams/armelf_phoenix.sh: Likewise. * emulparams/aarch64elf.sh: Likewise, and __data_start * emulparams/aarch64elf32.sh: Likewise. * emulparams/armelf.sh: Likewise. * emulparams/armnto.sh: Likewise. * emulparams/elf32bmip.sh: Remove duplicate ". = ." from OTHER_GOT_SYMBOLS. PROVIDE _ftext, _fdata, and _fbss in shared libs. * emulparams/elf32bmipn32-defs.sh: Likewise. * emulparams/elf32frv.sh: PROVIDE __end and __data_start in shared libs. * emulparams/elf32lriscv-defs.sh: Tidy. * emulparams/elf32mcore.sh: PROVIDE __bss_start and _bss_end in shared libs * emulparams/elf32ppccommon.sh: PROVIDE __end in shared libs. * emulparams/elf32rl78.sh: Tidy. * emulparams/i386nto.sh: PROVIDE _btext in shared libs. * emulparams/shelf_nto.sh: Likewise. * emulparams/shlelf_nto.sh: Likewise. * emulparams/score3_elf.sh: PROVIDE _gp, _bss_start__, _bss_end__, __bss_end__, __end__, _fdata, _sdata_begin, and _bss_start in shared libs. * scripttempl/elf.sc: Don't use EXECUTABLE_SYMBOLS for shared libraries. PROVIDE _edata, edata, __bss_start, and _end in shared libraries. * testsuite/ld-elf/pr23161.map, * testsuite/ld-elf/pr23161a.c, * testsuite/ld-elf/pr23161b.c, * testsuite/ld-elf/pr23161c.c, * testsuite/ld-elf/pr23161a.rd, * testsuite/ld-elf/pr23161b.rd, * testsuite/ld-elf/pr23161c.rd, * testsuite/ld-elf/pr23161d.rd: New tests. * testsuite/ld-elf/shared.exp: Run ld/23161 tests. * testsuite/ld-elf/pr23162.rd, * testsuite/ld-aarch64/ifunc-1-local.d, * testsuite/ld-aarch64/ifunc-1.d, * testsuite/ld-aarch64/ifunc-2-local.d, * testsuite/ld-aarch64/ifunc-2.d, * testsuite/ld-aarch64/ifunc-21.d, * testsuite/ld-aarch64/ifunc-3a.d, * testsuite/ld-alpha/tlsbin.rd, * testsuite/ld-alpha/tlsbin.sd, * testsuite/ld-alpha/tlsbinr.rd, * testsuite/ld-alpha/tlspic.rd, * testsuite/ld-alpha/tlspic.sd, * testsuite/ld-cris/dso-pltdis1.d, * testsuite/ld-cris/dso-pltdis2.d, * testsuite/ld-cris/dso12-pltdis.d, * testsuite/ld-cris/gotplt1.d, * testsuite/ld-cris/gotplt2.d, * testsuite/ld-cris/gotplt3.d, * testsuite/ld-cris/hiddef1.d, * testsuite/ld-cris/libdso-1.d, * testsuite/ld-cris/libdso-10.d, * testsuite/ld-cris/libdso-11.d, * testsuite/ld-cris/libdso-12.d, * testsuite/ld-cris/libdso-12b.d, * testsuite/ld-cris/libdso-12c.d, * testsuite/ld-cris/libdso-13.d, * testsuite/ld-cris/libdso-13b.d, * testsuite/ld-cris/libdso-14.d, * testsuite/ld-cris/libdso-15.d, * testsuite/ld-cris/libdso-15b.d, * testsuite/ld-cris/libdso-1c.d, * testsuite/ld-cris/libdso-1d.d, * testsuite/ld-cris/libdso-2.d, * testsuite/ld-cris/pic-gc-72.d, * testsuite/ld-cris/pic-gc-73.d, * testsuite/ld-cris/pr16044.d, * testsuite/ld-cris/pv32-1.d, * testsuite/ld-cris/tls-dso-dtpoffd2.d, * testsuite/ld-cris/tls-dso-dtpoffd4.d, * testsuite/ld-cris/tls-dso-tpoffgotcomm1.d, * testsuite/ld-cris/tls-gc-71.d, * testsuite/ld-cris/tls-gd-1.d, * testsuite/ld-cris/tls-gd-1h.d, * testsuite/ld-cris/tls-gd-2.d, * testsuite/ld-cris/tls-gd-2h.d, * testsuite/ld-cris/tls-ie-10.d, * testsuite/ld-cris/tls-ie-11.d, * testsuite/ld-cris/tls-ie-78.d, * testsuite/ld-cris/tls-ie-8.d, * testsuite/ld-cris/tls-ie-9.d, * testsuite/ld-cris/tls-js1.d, * testsuite/ld-cris/tls-ld-4.d, * testsuite/ld-cris/tls-ld-5.d, * testsuite/ld-cris/tls-ld-6.d, * testsuite/ld-cris/tls-ld-7.d, * testsuite/ld-cris/tls-ldgd-14.d, * testsuite/ld-cris/tls-ldgd-15.d, * testsuite/ld-cris/tls-ldgdex-14.d, * testsuite/ld-cris/tls-ldgdex-15.d, * testsuite/ld-cris/tls-ldgdx-14.d, * testsuite/ld-cris/tls-ldgdx-15.d, * testsuite/ld-cris/tls-legdx-16.d, * testsuite/ld-cris/tls-legdx-17.d, * testsuite/ld-cris/tls-local-54.d, * testsuite/ld-cris/tls-local-60.d, * testsuite/ld-cris/tls-local-61.d, * testsuite/ld-cris/tls-local-63.d, * testsuite/ld-cris/tls-local-64.d, * testsuite/ld-cris/tls-ok-30.d, * testsuite/ld-cris/tls-ok-32.d, * testsuite/ld-cris/tls-ok-34.d, * testsuite/ld-cris/tls-und-38.d, * testsuite/ld-cris/tls-und-42.d, * testsuite/ld-cris/tls-und-46.d, * testsuite/ld-cris/tls-und-50.d, * testsuite/ld-cris/weakhiddso.d, * testsuite/ld-cris/weakref2.d, * testsuite/ld-frv/fdpic-shared-1.d, * testsuite/ld-frv/fdpic-shared-2.d, * testsuite/ld-frv/fdpic-shared-3.d, * testsuite/ld-frv/fdpic-shared-4.d, * testsuite/ld-frv/fdpic-shared-5.d, * testsuite/ld-frv/fdpic-shared-7.d, * testsuite/ld-frv/fdpic-shared-8.d, * testsuite/ld-frv/tls-dynamic-2.d, * testsuite/ld-i386/ibt-plt-1.d, * testsuite/ld-i386/ibt-plt-2a.d, * testsuite/ld-i386/ibt-plt-2b.d, * testsuite/ld-i386/ibt-plt-2c.d, * testsuite/ld-i386/ibt-plt-2d.d, * testsuite/ld-i386/ibt-plt-3a.d, * testsuite/ld-i386/ibt-plt-3b.d, * testsuite/ld-i386/ibt-plt-3c.d, * testsuite/ld-i386/ibt-plt-3d.d, * testsuite/ld-i386/plt2.dd, * testsuite/ld-i386/pr20830.d, * testsuite/ld-i386/tlsbin-nacl.rd, * testsuite/ld-i386/tlsbin.rd, * testsuite/ld-i386/tlsbin2-nacl.rd, * testsuite/ld-i386/tlsbin2.rd, * testsuite/ld-i386/tlsbindesc-nacl.rd, * testsuite/ld-i386/tlsbindesc.rd, * testsuite/ld-i386/tlsdesc-nacl.rd, * testsuite/ld-i386/tlsdesc.rd, * testsuite/ld-i386/tlsgdesc-nacl.rd, * testsuite/ld-i386/tlsgdesc.rd, * testsuite/ld-i386/tlsnopic-nacl.rd, * testsuite/ld-i386/tlsnopic.dd, * testsuite/ld-i386/tlsnopic.rd, * testsuite/ld-i386/tlsnopic.sd, * testsuite/ld-i386/tlspic-nacl.rd, * testsuite/ld-i386/tlspic.rd, * testsuite/ld-i386/tlspic2-nacl.rd, * testsuite/ld-i386/tlspic2.rd, * testsuite/ld-ia64/merge1.d, * testsuite/ld-ia64/merge2.d, * testsuite/ld-ia64/merge3.d, * testsuite/ld-ia64/merge4.d, * testsuite/ld-ia64/merge5.d, * testsuite/ld-ia64/tlsbin.rd, * testsuite/ld-ia64/tlspic.rd, * testsuite/ld-ifunc/ifunc-2-i386-now.d, * testsuite/ld-ifunc/ifunc-2-local-i386-now.d, * testsuite/ld-ifunc/ifunc-2-local-x86-64-now.d, * testsuite/ld-ifunc/ifunc-2-local-x86-64.d, * testsuite/ld-ifunc/ifunc-2-x86-64-now.d, * testsuite/ld-ifunc/ifunc-2-x86-64.d, * testsuite/ld-ifunc/pr17154-i386-now.d, * testsuite/ld-ifunc/pr17154-i386.d, * testsuite/ld-ifunc/pr17154-x86-64-now.d, * testsuite/ld-ifunc/pr17154-x86-64.d, * testsuite/ld-m68k/tls-def-1.d, * testsuite/ld-m68k/tls-gd-1.d2, * testsuite/ld-metag/shared.d, * testsuite/ld-metag/stub_pic_app.d, * testsuite/ld-mips-elf/rel32-n32.d, * testsuite/ld-mips-elf/rel32-o32.d, * testsuite/ld-mips-elf/rel64.d, * testsuite/ld-powerpc/ambiguousv1.d, * testsuite/ld-powerpc/ambiguousv1b.d, * testsuite/ld-powerpc/ambiguousv2.d, * testsuite/ld-powerpc/ambiguousv2b.d, * testsuite/ld-powerpc/tlsexe.d, * testsuite/ld-powerpc/tlsexe.r, * testsuite/ld-powerpc/tlsexe32.d, * testsuite/ld-powerpc/tlsexe32.g, * testsuite/ld-powerpc/tlsexe32.r, * testsuite/ld-powerpc/tlsexetoc.d, * testsuite/ld-powerpc/tlsexetoc.r, * testsuite/ld-powerpc/tlsso.d, * testsuite/ld-powerpc/tlsso.r, * testsuite/ld-powerpc/tlsso32.g, * testsuite/ld-powerpc/tlsso32.r, * testsuite/ld-powerpc/tlstocso.d, * testsuite/ld-powerpc/tlstocso.g, * testsuite/ld-powerpc/tlstocso.r, * testsuite/ld-s390/gotreloc_31-1.dd, * testsuite/ld-s390/tlsbin.dd, * testsuite/ld-s390/tlsbin.rd, * testsuite/ld-s390/tlsbin_64.dd, * testsuite/ld-s390/tlsbin_64.rd, * testsuite/ld-s390/tlspic.rd, * testsuite/ld-s390/tlspic_64.rd, * testsuite/ld-sh/tlsbin-2.d, * testsuite/ld-sh/tlspic-2.d, * testsuite/ld-sparc/gotop32.rd, * testsuite/ld-sparc/gotop64.rd, * testsuite/ld-sparc/tlssunbin32.rd, * testsuite/ld-sparc/tlssunbin64.rd, * testsuite/ld-sparc/tlssunnopic32.rd, * testsuite/ld-sparc/tlssunnopic64.rd, * testsuite/ld-sparc/tlssunpic32.rd, * testsuite/ld-sparc/tlssunpic64.rd, * testsuite/ld-x86-64/bnd-branch-1-now.d, * testsuite/ld-x86-64/bnd-ifunc-1-now.d, * testsuite/ld-x86-64/bnd-ifunc-2-now.d, * testsuite/ld-x86-64/bnd-ifunc-2.d, * testsuite/ld-x86-64/bnd-plt-1-now.d, * testsuite/ld-x86-64/bnd-plt-1.d, * testsuite/ld-x86-64/ibt-plt-1-x32.d, * testsuite/ld-x86-64/ibt-plt-1.d, * testsuite/ld-x86-64/ibt-plt-2a-x32.d, * testsuite/ld-x86-64/ibt-plt-2a.d, * testsuite/ld-x86-64/ibt-plt-2b-x32.d, * testsuite/ld-x86-64/ibt-plt-2b.d, * testsuite/ld-x86-64/ibt-plt-2c-x32.d, * testsuite/ld-x86-64/ibt-plt-2c.d, * testsuite/ld-x86-64/ibt-plt-2d-x32.d, * testsuite/ld-x86-64/ibt-plt-2d.d, * testsuite/ld-x86-64/ibt-plt-3a-x32.d, * testsuite/ld-x86-64/ibt-plt-3a.d, * testsuite/ld-x86-64/ibt-plt-3b-x32.d, * testsuite/ld-x86-64/ibt-plt-3b.d, * testsuite/ld-x86-64/ibt-plt-3c-x32.d, * testsuite/ld-x86-64/ibt-plt-3c.d, * testsuite/ld-x86-64/ibt-plt-3d-x32.d, * testsuite/ld-x86-64/ibt-plt-3d.d, * testsuite/ld-x86-64/ilp32-4-nacl.d, * testsuite/ld-x86-64/ilp32-4.d, * testsuite/ld-x86-64/load1c-nacl.d, * testsuite/ld-x86-64/load1c.d, * testsuite/ld-x86-64/load1d-nacl.d, * testsuite/ld-x86-64/load1d.d, * testsuite/ld-x86-64/mpx3n.dd, * testsuite/ld-x86-64/mpx4.dd, * testsuite/ld-x86-64/mpx4n.dd, * testsuite/ld-x86-64/plt2.dd, * testsuite/ld-x86-64/pr14207.d, * testsuite/ld-x86-64/pr19162.d, * testsuite/ld-x86-64/pr20253-1f.d, * testsuite/ld-x86-64/pr20253-1l.d, * testsuite/ld-x86-64/pr20830a-now.d, * testsuite/ld-x86-64/pr20830a.d, * testsuite/ld-x86-64/pr20830b-now.d, * testsuite/ld-x86-64/pr20830b.d, * testsuite/ld-x86-64/pr21038a-now.d, * testsuite/ld-x86-64/pr21038a.d, * testsuite/ld-x86-64/pr21038b-now.d, * testsuite/ld-x86-64/pr21038b.d, * testsuite/ld-x86-64/pr21038c-now.d, * testsuite/ld-x86-64/pr21038c.d, * testsuite/ld-x86-64/tlsbin-nacl.rd, * testsuite/ld-x86-64/tlsbin.rd, * testsuite/ld-x86-64/tlsbin2-nacl.rd, * testsuite/ld-x86-64/tlsbin2.rd, * testsuite/ld-x86-64/tlsbindesc-nacl.rd, * testsuite/ld-x86-64/tlsbindesc.rd, * testsuite/ld-x86-64/tlsdesc-nacl.rd, * testsuite/ld-x86-64/tlsdesc.rd, * testsuite/ld-x86-64/tlsgdesc-nacl.rd, * testsuite/ld-x86-64/tlsgdesc.rd, * testsuite/ld-x86-64/tlspic-nacl.rd, * testsuite/ld-x86-64/tlspic.rd, * testsuite/ld-x86-64/tlspic2-nacl.rd, * testsuite/ld-x86-64/tlspic2.rd: Update. |
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H.J. Lu
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dc2be3d2f6 |
x86: Generate PLT relocations for -z now
This patch partially reverses: commit |
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H.J. Lu
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38b123494b |
x86-64: Improve PLT generation and synthetic PLT symbols
On x86-64, the procedure linkage table (PLT) is used to
1. Call external function.
2. Call internal IFUNC function. The best implementation is selected
for the target processor at run-time.
3. Act as the canonical function address.
4. Support LD_AUDIT to audit external function calls.
5. Support LD_PROFILE to profile external function calls.
PLT looks like:
PLT0: push GOT[1]
jmp *GOT[2]
nop
PLT1: jmp *GOT[name1_index]
push name1_reloc_index
jmp PLT0
GOT is an array of addresses. Initially the GOT entry of name1 is
filled with the address of the "push name1_reloc_index" instruction.
The function, name1, is called via "jmp *GOT[name1]" in the PLT entry.
Even when lazy binding is disabled by "-z now", the PLT0 entry may
still be used with LD_AUDIT or LD_PROFILE if PLT entry is used for
canonical function address.
When linker is invoked with "-z bndplt", a different PLT layout in .plt
is used:
PLT0: push GOT[1]
bnd jmp *GOT[2]
nop
PLT1: push name1_reloc_index
bnd jmp PLT0
nop
together with a second PLT section, .pl.bnd:
PLT1: bnd jmp *GOT[name1_index]
nop
where the GOT entry of name1 is filled with the address of the push
instruction of the corresponding entry in .plt.
1. With lazy binding, when the external function, name1, is called the
first time, dynamic linker is called via PLT0 to update GOT[name1_index]
with the actual address of name1 and transfers control to name1
afterwards.
2. PLT is also used to call a local IFUNC function, name1, run-time
loader updates GOT[name1_index] when loading the module.
This patch
1. Remove PLT layout configurations from x86-64 backend_data.
2. Add generic, lay and non-lazy PLT layout configurations to x86-64
link_hash_table. Generic PLT layout includes the PLT entry templates,
information how to update the first instruction in PLT and PLT eh_frame
informaton, which are initialized in x86-64 setup_gnu_properties, based
on "-z bndplt" and target selection. PLT section alignment is also set
to PLT entry size for non-NaCl target.
3. Remove elf_x86_64_create_dynamic_sections. create_dynamic_sections
isn't always called, but GOT relocations need GOT relocations. Instead,
create all x86-64 specific dynamic sections with alignment to their entry
size in x86-64 setup_gnu_properties, which initializes elf.dynobj, so
that x86-64 check_relocs can be simplified.
4. Rewrite elf_x86_64_get_synthetic_symtab to check PLT sections against
all dynamic relocations to support both lazy and non-lazy PLTs.
There is no change in PLT. The only externally visible change is the
improvement of synthetic PLT symbols for .plt.got.
bfd/
* elf64-x86-64.c (PLT_ENTRY_SIZE): Renamed to ...
(LAZY_PLT_ENTRY_SIZE): This.
(NON_LAZY_PLT_ENTRY_SIZE): New.
(elf_x86_64_plt0_entry): Renamed to ...
(elf_x86_64_lazy_plt0_entry): This.
(elf_x86_64_plt_entry): Renamed to ...
(elf_x86_64_lazy_plt_entry): This.
(elf_x86_64_bnd_plt0_entry): Renamed to ...
(elf_x86_64_lazy_bnd_plt0_entry): This.
(elf_x86_64_legacy_plt_entry): Removed.
(elf_x86_64_bnd_plt_entry): Renamed to ...
(elf_x86_64_lazy_bnd_plt_entry): This.
(elf_x86_64_legacy_plt2_entry): Renamed to ...
(elf_x86_64_non_lazy_plt_entry): This.
(elf_x86_64_bnd_plt2_entry): Renamed to ...
(elf_x86_64_non_lazy_bnd_plt_entry): This.
(elf_x86_64_eh_frame_plt): Renamed to ...
(elf_x86_64_eh_frame_lazy_plt): This.
(elf_x86_64_eh_frame_bnd_plt): Renamed to ...
(elf_x86_64_eh_frame_lazy_bnd_plt): This.
(elf_x86_64_eh_frame_plt_got): Renamed to ...
(elf_x86_64_eh_frame_non_lazy_plt): This.
(elf_x86_64_lazy_plt_layout): New.
(elf_x86_64_non_lazy_plt_layout): Likewise.
(elf_x86_64_plt_layout): Likewise.
(elf_x86_64_backend_data): Remove PLT layout information. Add
os for target system.
(GET_PLT_ENTRY_SIZE): Removed.
(elf_x86_64_lazy_plt): New.
(elf_x86_64_non_lazy_plt): Likewise.
(elf_x86_64_lazy_bnd_plt): Likewise.
(elf_x86_64_non_lazy_bnd_plt): Likewise.
(elf_x86-64_arch_bed): Updated.
(elf_x86_64_link_hash_table): Add plt, lazy_plt and non_lazy_plt.
(elf_x86_64_create_dynamic_sections): Removed.
(elf_x86_64_check_relocs): Don't check elf.dynobj. Don't call
_bfd_elf_create_ifunc_sections nor _bfd_elf_create_got_section.
(elf_x86-64_adjust_dynamic_symbol): Updated.
(elf_x86_64_allocate_dynrelocs): Updated. Pass 0 as PLT header
size to _bfd_elf_allocate_ifunc_dyn_relocs and don't allocate
size for PLT0 if there is no PLT0. Get plt_entry_size from
non_lazy_plt for non-lazy PLT entries.
(elf_x86_64_size_dynamic_sections): Updated. Get plt_entry_size
from non_lazy_plt for non-lazy PLT entries.
(elf_x86-64_relocate_section): Updated. Properly get PLT index
if there is no PLT0.
(elf_x86_64_finish_dynamic_symbol): Updated. Fill the first slot
in the PLT entry with generic PLT layout. Fill the non-lazy PLT
entries with non-lazy PLT layout. Don't fill the second and third
slots in the PLT entry if there is no PLT0.
(elf_x86_64_finish_dynamic_sections): Updated. Don't fill PLT0
if there is no PLT0. Set sh_entsize on the .plt.got section.
(compare_relocs): New.
(elf_x86_64_plt_type): Likewise.
(elf_x86_64_plt): Likewise.
(elf_x86_64_nacl_plt): New. Forward declaration.
(elf_x86_64_get_plt_sym_val): Removed.
(elf_x86_64_get_synthetic_symtab): Rewrite to check PLT sections
against all dynamic relocations.
(elf_x86_64_link_setup_gnu_properties): New function.
(elf_backend_create_dynamic_sections): Updated.
(elf_backend_setup_gnu_properties): New.
(elf_x86_64_nacl_plt): New.
(elf_x86_64_nacl_arch_bed): Updated.
ld/
* testsuite/ld-ifunc/ifunc-16-x86-64-now.d: New file.
* testsuite/ld-ifunc/ifunc-2-local-x86-64-now.d: Likewise.
* testsuite/ld-ifunc/ifunc-2-x86-64-now.d: Likewise.
* testsuite/ld-ifunc/pr17154-x86-64-now.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-plt-1-now.d: Likewise.
* testsuite/ld-x86-64/mpx3n.dd: Likewise.
* testsuite/ld-x86-64/mpx4n.dd: Likewise.
* testsuite/ld-x86-64/plt-main-bnd-now.rd: Likewise.
* testsuite/ld-x86-64/plt2.dd: Likewise.
* testsuite/ld-x86-64/plt2.rd: Likewise.
* testsuite/ld-x86-64/plt2.s: Likewise.
* testsuite/ld-x86-64/pr20830a-now.d: Likewise.
* testsuite/ld-x86-64/pr20830b-now.d: Likewise.
* testsuite/ld-x86-64/pr21038a-now.d: Likewise.
* testsuite/ld-x86-64/pr21038b-now.d: Likewise.
* testsuite/ld-x86-64/pr21038c-now.d: Likewise.
* testsuite/ld-x86-64/load1b-nacl.d: Updated.
* testsuite/ld-x86-64/load1b.d: Likewise.
* testsuite/ld-x86-64/plt-main-bnd.dd: Likewise.
* testsuite/ld-x86-64/pr20253-1h.d: Likewise.
* testsuite/ld-x86-64/pr20830a.d: Update the .plt.got section
with func@plt.
* testsuite/ld-x86-64/pr20830b.d: Likewise.
* testsuite/ld-x86-64/pr21038a.d: Likewise.
* testsuite/ld-x86-64/pr21038c.d: Likewise.
* testsuite/ld-x86-64/mpx.exp: Add some -z now tests.
* testsuite/ld-x86-64/x86-64.exp: Likewise.
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