binutils-gdb/ld/testsuite/ld-ifunc/ifunc-2-local-i386-now.d

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i386: Improve PLT generation and synthetic PLT symbols On i386, 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. 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 i386 backend_data. 2. Add generic, lay and non-lazy PLT layout configurations to i386 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 i386 setup_gnu_properties, based on PIC and target selection. PLT section alignment is also set to PLT entry size for non-NaCl/VxWorks target. 3. Remove elf_i386_create_dynamic_sections. create_dynamic_sections isn't always called, but GOT relocations need GOT relocations. Instead, create all i386 specific dynamic sections in i386 setup_gnu_properties, which initializes elf.dynobj, so that i386 check_relocs can be simplified. 4. Rewrite elf_i386_get_synthetic_symtab to check PLT sections against all dynamic relocations to support both lazy and non-lazy PLTs. bfd/ * elf32-i386.c (PLT_ENTRY_SIZE): Renamed to ... (LAZY_PLT_ENTRY_SIZE): This. (NON_LAZY_PLT_ENTRY_SIZE): New. (elf_i386_plt0_entry): Renamed to ... (elf_i386_lazy_plt0_entry): This. (elf_i386_plt_entry): Renamed to ... (elf_i386_lazy_plt_entry): This. (elf_i386_pic_plt0_entry): Renamed to ... (elf_i386_pic_lazy_plt0_entry): This. (elf_i386_pic_plt_entry): Renamed to ... (elf_i386_pic_lazy_plt_entry): This. (elf_i386_got_plt_entry): Renamed to ... (elf_i386_non_lazy_plt_entry): This. (elf_i386_pic_got_plt_entry): Renamed to ... (elf_i386_pic_non_lazy_plt_entry): This. (elf_i386_eh_frame_plt): Renamed to ... (elf_i386_eh_frame_lazy_plt): This. (elf_i386_eh_frame_plt_got): Renamed to ... (elf_i386_eh_frame_non_lazy_plt): This. (elf_i386_plt_layout): Renamed to ... (elf_i386_lazy_plt_layout): This. Remove eh_frame_plt_got and eh_frame_plt_got_size. (elf_i386_non_lazy_plt_layout): New. (elf_i386_plt_layout): Likewise. (elf_i386_non_lazy_plt): Likewise. (GET_PLT_ENTRY_SIZE): Removed. (elf_i386_plt): Renamed to ... (elf_i386_lazy_plt): This. (elf_i386_backend_data): Remove plt. Rename is_vxworks to os. (elf_i386_arch_bed): Updated. (elf_i386_link_hash_table): Add plt, lazy_plt and non_lazy_plt. (elf_i386_create_dynamic_sections): Removed. (elf_i386_check_relocs): Don't check elf.dynobj. Don't call _bfd_elf_create_ifunc_sections nor _bfd_elf_create_got_section. (elf_i386_adjust_dynamic_symbol): Updated. (elf_i386_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. (elf_i386_size_dynamic_sections): Updated. Check whether GOT output section is discarded only if GOT isn't empty. (elf_i386_relocate_section): Updated. Properly get PLT index if there is no PLT0. (elf_i386_finish_dynamic_symbol): Updated. Don't fill the second and third slots in the PLT entry if there is no PLT0. (elf_i386_finish_dynamic_sections): Updated. Don't fill PLT0 if there is no PLT0. Set sh_entsize on the .plt.got section. (elf_i386_nacl_plt): Forward declaration. (elf_i386_get_plt_sym_val): Removed. (elf_i386_get_synthetic_symtab): Rewrite to check PLT sections against all dynamic relocations. (elf_i386_link_setup_gnu_properties): New function. (elf_backend_create_dynamic_sections): Updated. (elf_backend_setup_gnu_properties): New. (elf_i386_nacl_plt): Updated. (elf_i386_nacl_arch_bed): Likewise. (elf_i386_vxworks_arch_bed): Likewise. ld/ * testsuite/ld-i386/i386.exp: Add some -z now tests. * testsuite/ld-i386/plt-pic2.dd: New file. * testsuite/ld-i386/plt2.dd: Likewise. * testsuite/ld-i386/plt2.rd: Likewise. * testsuite/ld-i386/plt2.s: Likewise. * testsuite/ld-ifunc/ifunc-16-i386-now.d: Likewise. * testsuite/ld-ifunc/ifunc-2-i386-now.d: Likewise. * testsuite/ld-ifunc/ifunc-2-local-i386-now.d: Likewise. * testsuite/ld-ifunc/pr17154-i386-now.d: Likewise. * testsuite/ld-i386/pr20830.d: Update the .plt.got section with func@plt.
2017-05-09 01:10:22 +08:00
#source: ifunc-2-local-i386.s
elf: Support DT_RELR in linker tests Allow eabling and disabling DT_RELR in linker tests. Disable DT_RELR in linker tests which don't expect DT_RELR in linker outputs. binutils/ * testsuite/lib/binutils-common.exp (run_dump_test): Make DT_RELR_LDFLAGS and NO_DT_RELR_LDFLAGS global. ld/ * testsuite/config/default.exp (DT_RELR_LDFLAGS): New. (DT_RELR_CC_LDFLAGS): Likewise. (NO_DT_RELR_LDFLAGS): Likewise. (NO_DT_RELR_CC_LDFLAGS): Likewise. * testsuite/ld-elf/shared.exp: Pass $NO_DT_RELR_LDFLAGS to linker for some tests. * testsuite/ld-i386/export-class.exp: Likewise. * testsuite/ld-i386/i386.exp: Likewise. * testsuite/ld-i386/ibt-plt-2a.d: Pass $NO_DT_RELR_LDFLAGS to linker. * testsuite/ld-i386/ibt-plt-3a.d: Likewise. * testsuite/ld-i386/ibt-plt-3c.d: Likewise. * testsuite/ld-i386/pr26869.d: Likewise. * testsuite/ld-i386/report-reloc-1.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/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-2a-x32.d: Likewise. * testsuite/ld-x86-64/ibt-plt-2a.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/ilp32-4.d: Likewise. * testsuite/ld-x86-64/load1c.d: Likewise. * testsuite/ld-x86-64/load1d.d: Likewise. * testsuite/ld-x86-64/pr13082-2b.d: Likewise. * testsuite/ld-x86-64/pr14207.d: Likewise. * testsuite/ld-x86-64/pr18176.d: Likewise. * testsuite/ld-x86-64/pr19162.d: Likewise. * testsuite/ld-x86-64/pr19636-2d.d: Likewise. * testsuite/ld-x86-64/pr19636-2l.d: Likewise. * testsuite/ld-x86-64/pr20253-1d.d: Likewise. * testsuite/ld-x86-64/pr20253-1f.d: Likewise. * testsuite/ld-x86-64/pr20253-1j.d: Likewise. * testsuite/ld-x86-64/pr20253-1l.d: Likewise. * testsuite/ld-x86-64/report-reloc-1-x32.d: Likewise. * testsuite/ld-x86-64/report-reloc-1.d: Likewise. * testsuite/ld-x86-64/export-class.exp (x86_64_export_class_test): Pass $NO_DT_RELR_LDFLAGS to linker. * testsuite/ld-x86-64/x86-64.exp: Pass $NO_DT_RELR_LDFLAGS to linker for some tests.
2022-01-05 23:12:03 +08:00
#ld: -z now -m elf_i386 -shared --hash-style=sysv -z noseparate-code $NO_DT_RELR_LDFLAGS
i386: Improve PLT generation and synthetic PLT symbols On i386, 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. 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 i386 backend_data. 2. Add generic, lay and non-lazy PLT layout configurations to i386 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 i386 setup_gnu_properties, based on PIC and target selection. PLT section alignment is also set to PLT entry size for non-NaCl/VxWorks target. 3. Remove elf_i386_create_dynamic_sections. create_dynamic_sections isn't always called, but GOT relocations need GOT relocations. Instead, create all i386 specific dynamic sections in i386 setup_gnu_properties, which initializes elf.dynobj, so that i386 check_relocs can be simplified. 4. Rewrite elf_i386_get_synthetic_symtab to check PLT sections against all dynamic relocations to support both lazy and non-lazy PLTs. bfd/ * elf32-i386.c (PLT_ENTRY_SIZE): Renamed to ... (LAZY_PLT_ENTRY_SIZE): This. (NON_LAZY_PLT_ENTRY_SIZE): New. (elf_i386_plt0_entry): Renamed to ... (elf_i386_lazy_plt0_entry): This. (elf_i386_plt_entry): Renamed to ... (elf_i386_lazy_plt_entry): This. (elf_i386_pic_plt0_entry): Renamed to ... (elf_i386_pic_lazy_plt0_entry): This. (elf_i386_pic_plt_entry): Renamed to ... (elf_i386_pic_lazy_plt_entry): This. (elf_i386_got_plt_entry): Renamed to ... (elf_i386_non_lazy_plt_entry): This. (elf_i386_pic_got_plt_entry): Renamed to ... (elf_i386_pic_non_lazy_plt_entry): This. (elf_i386_eh_frame_plt): Renamed to ... (elf_i386_eh_frame_lazy_plt): This. (elf_i386_eh_frame_plt_got): Renamed to ... (elf_i386_eh_frame_non_lazy_plt): This. (elf_i386_plt_layout): Renamed to ... (elf_i386_lazy_plt_layout): This. Remove eh_frame_plt_got and eh_frame_plt_got_size. (elf_i386_non_lazy_plt_layout): New. (elf_i386_plt_layout): Likewise. (elf_i386_non_lazy_plt): Likewise. (GET_PLT_ENTRY_SIZE): Removed. (elf_i386_plt): Renamed to ... (elf_i386_lazy_plt): This. (elf_i386_backend_data): Remove plt. Rename is_vxworks to os. (elf_i386_arch_bed): Updated. (elf_i386_link_hash_table): Add plt, lazy_plt and non_lazy_plt. (elf_i386_create_dynamic_sections): Removed. (elf_i386_check_relocs): Don't check elf.dynobj. Don't call _bfd_elf_create_ifunc_sections nor _bfd_elf_create_got_section. (elf_i386_adjust_dynamic_symbol): Updated. (elf_i386_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. (elf_i386_size_dynamic_sections): Updated. Check whether GOT output section is discarded only if GOT isn't empty. (elf_i386_relocate_section): Updated. Properly get PLT index if there is no PLT0. (elf_i386_finish_dynamic_symbol): Updated. Don't fill the second and third slots in the PLT entry if there is no PLT0. (elf_i386_finish_dynamic_sections): Updated. Don't fill PLT0 if there is no PLT0. Set sh_entsize on the .plt.got section. (elf_i386_nacl_plt): Forward declaration. (elf_i386_get_plt_sym_val): Removed. (elf_i386_get_synthetic_symtab): Rewrite to check PLT sections against all dynamic relocations. (elf_i386_link_setup_gnu_properties): New function. (elf_backend_create_dynamic_sections): Updated. (elf_backend_setup_gnu_properties): New. (elf_i386_nacl_plt): Updated. (elf_i386_nacl_arch_bed): Likewise. (elf_i386_vxworks_arch_bed): Likewise. ld/ * testsuite/ld-i386/i386.exp: Add some -z now tests. * testsuite/ld-i386/plt-pic2.dd: New file. * testsuite/ld-i386/plt2.dd: Likewise. * testsuite/ld-i386/plt2.rd: Likewise. * testsuite/ld-i386/plt2.s: Likewise. * testsuite/ld-ifunc/ifunc-16-i386-now.d: Likewise. * testsuite/ld-ifunc/ifunc-2-i386-now.d: Likewise. * testsuite/ld-ifunc/ifunc-2-local-i386-now.d: Likewise. * testsuite/ld-ifunc/pr17154-i386-now.d: Likewise. * testsuite/ld-i386/pr20830.d: Update the .plt.got section with func@plt.
2017-05-09 01:10:22 +08:00
#as: --32
#objdump: -dw
#target: x86_64-*-* i?86-*-*
Remove x86 NaCl target support NaCl has been deprecated: https://developer.chrome.com/native-client/migration and NaCl will completely disappear in 2021: https://lists.llvm.org/pipermail/llvm-dev/2020-April/141107.html Remove x86 NaCl target support from bfd, binutils, gas and ld. bfd/ * archures.c (bfd_mach_i386_nacl): Removed. (bfd_mach_i386_i386_nacl): Likewise. (bfd_mach_x86_64_nacl): Likewise. (bfd_mach_x64_32_nacl): Likewise. * config.bfd: Remove *-*-nacl* targets. * configure.ac: Remove x86 NaCl target vectors. * cpu-i386.c (bfd_arch_i386_onebyte_nop_fill): Removed. (bfd_x64_32_nacl_arch): Likewise. (bfd_x86_64_nacl_arch): Likewise. (bfd_i386_nacl_arch): Likewise. (bfd_x64_32_arch_intel_syntax): Updated. * elf32-i386.c: Don't include "elf-nacl.h". (elf_i386_nacl_plt): Removed. (elf_i386_nacl_plt0_entry): Likewise. (elf_i386_nacl_plt_entry): Likewise. (elf_i386_nacl_pic_plt0_entry): Likewise. (elf_i386_nacl_pic_plt_entry): Likewise. (elf_i386_nacl_eh_frame_plt): Likewise. (elf_i386_nacl_plt): Likewise. (elf32_i386_nacl_elf_object_p): Likewise. (elf_i386_get_synthetic_symtab): Updated. (elf_i386_link_setup_gnu_properties): Likewise. * elf64-x86-64.c: Don't include "elf-nacl.h". (elf_x86_64_nacl_plt): Removed. (elf64_x86_64_nacl_elf_object_p): Likewise. (elf_x86_64_nacl_plt0_entry): Likewise. (elf_x86_64_nacl_plt_entry): Likewise. (elf_x86_64_nacl_eh_frame_plt): Likewise. (elf_x86_64_nacl_plt): Likewise. (elf32_x86_64_nacl_elf_object_p): Likewise. (elf_x86_64_get_synthetic_symtab): Updated. (elf_x86_64_link_setup_gnu_properties): Likewise. * elfxx-x86.c (_bfd_x86_elf_link_setup_gnu_properties): Likewise. * targets.c: Remove x86 NaCl target vectors. * bfd-in2.h: Regenerated. * configure: Likewise. binutils/ * NEWS: Mention x86 NaCl target support removal. * dwarf.c (init_dwarf_regnames_by_bfd_arch_and_mach): Remove x86 NaCl target support. * testsuite/binutils-all/elfedit-1.d: Likewise. * testsuite/binutils-all/i386/i386.exp: Likewise. * testsuite/binutils-all/x86-64/objects.exp: Likewise. * testsuite/binutils-all/x86-64/pr23494a-x32.d: Likewise. * testsuite/binutils-all/x86-64/pr23494a.d: Likewise. * testsuite/binutils-all/x86-64/pr23494b-x32.d: Likewise. * testsuite/binutils-all/x86-64/pr23494b.d: Likewise. * testsuite/binutils-all/x86-64/pr23494c-x32.d: Likewise. * testsuite/binutils-all/x86-64/pr23494c.d: Likewise. * testsuite/binutils-all/x86-64/pr23494d-x32.d: Likewise. * testsuite/binutils-all/x86-64/pr23494d.d: Likewise. * testsuite/binutils-all/x86-64/pr23494e-x32.d: Likewise. * testsuite/binutils-all/x86-64/pr23494e.d: Likewise. * testsuite/binutils-all/x86-64/x86-64.exp: Likewise. gas/ * NEWS: Mention x86 NaCl target support removal. * config/tc-i386.c: Remove x86 NaCl target support. * config/tc-i386.h: Likewise. * configure.tgt: Likewise. * testsuite/gas/i386/i386.exp: Likewise. * testsuite/gas/i386/iamcu-1.d: Likewise. * testsuite/gas/i386/iamcu-2.d: Likewise. * testsuite/gas/i386/iamcu-3.d: Likewise. * testsuite/gas/i386/iamcu-4.d: Likewise. * testsuite/gas/i386/iamcu-5.d: Likewise. * testsuite/gas/i386/k1om.d: Likewise. * testsuite/gas/i386/l1om.d: Likewise. ld/ * Makefile.am (ALL_EMULATION_SOURCES): Remove eelf_i386_nacl.c, eelf32_x86_64_nacl.c, eelf_x86_64_nacl.c. Remove x86 NaCl dep files. * NEWS: Mention x86 NaCl target support removal. * configure.tgt: Remove x86 NaCl target support. * testsuite/ld-elf/binutils.exp: Likewise. * testsuite/ld-elf/elf.exp: Likewise. * testsuite/ld-elfvers/vers.exp: Likewise. * testsuite/ld-i386/align-branch-1.d: Likewise. * testsuite/ld-i386/export-class.exp: Likewise. * testsuite/ld-i386/i386.exp: Likewise. * testsuite/ld-i386/load1.d: Likewise. * testsuite/ld-i386/pie1.d: Likewise. * testsuite/ld-i386/pr12570a.d: Likewise. * testsuite/ld-i386/pr12570b.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-i386/pr19636-2d.d: Likewise. * testsuite/ld-i386/pr19636-2e.d: Likewise. * testsuite/ld-i386/pr20244-1a.d: Likewise. * testsuite/ld-i386/pr20244-1b.d: Likewise. * testsuite/ld-i386/pr20244-2a.d: Likewise. * testsuite/ld-i386/pr20244-2b.d: Likewise. * testsuite/ld-i386/pr20244-2c.d: Likewise. * testsuite/ld-i386/pr20244-4a.d: Likewise. * testsuite/ld-i386/pr20244-4b.d: Likewise. * testsuite/ld-i386/pr21884.d: Likewise. * testsuite/ld-ifunc/binutils.exp: Likewise. * testsuite/ld-ifunc/ifunc-10-i386.d: Likewise. * testsuite/ld-ifunc/ifunc-10-x86-64.d: Likewise. * testsuite/ld-ifunc/ifunc-11-i386.d: Likewise. * testsuite/ld-ifunc/ifunc-11-x86-64.d: Likewise. * testsuite/ld-ifunc/ifunc-12-i386.d: Likewise. * testsuite/ld-ifunc/ifunc-12-x86-64.d: Likewise. * testsuite/ld-ifunc/ifunc-13-i386.d: Likewise. * testsuite/ld-ifunc/ifunc-13-x86-64.d: Likewise. * testsuite/ld-ifunc/ifunc-14a-i386.d: Likewise. * testsuite/ld-ifunc/ifunc-14a-x86-64.d: Likewise. * testsuite/ld-ifunc/ifunc-14b-i386.d: Likewise. * testsuite/ld-ifunc/ifunc-14b-x86-64.d: Likewise. * testsuite/ld-ifunc/ifunc-14c-i386.d: Likewise. * testsuite/ld-ifunc/ifunc-14c-x86-64.d: Likewise. * testsuite/ld-ifunc/ifunc-14d-i386.d: Likewise. * testsuite/ld-ifunc/ifunc-14d-x86-64.d: Likewise. * testsuite/ld-ifunc/ifunc-14e-i386.d: Likewise. * testsuite/ld-ifunc/ifunc-14e-x86-64.d: Likewise. * testsuite/ld-ifunc/ifunc-14f-i386.d: Likewise. * testsuite/ld-ifunc/ifunc-14f-x86-64.d: Likewise. * testsuite/ld-ifunc/ifunc-15-i386.d: Likewise. * testsuite/ld-ifunc/ifunc-15-x86-64.d: Likewise. * testsuite/ld-ifunc/ifunc-16-i386-now.d: Likewise. * testsuite/ld-ifunc/ifunc-16-i386.d: Likewise. * testsuite/ld-ifunc/ifunc-16-x86-64-now.d: Likewise. * testsuite/ld-ifunc/ifunc-16-x86-64.d: Likewise. * testsuite/ld-ifunc/ifunc-17a-i386.d: Likewise. * testsuite/ld-ifunc/ifunc-17a-x86-64.d: Likewise. * testsuite/ld-ifunc/ifunc-17b-i386.d: Likewise. * testsuite/ld-ifunc/ifunc-17b-x86-64.d: Likewise. * testsuite/ld-ifunc/ifunc-18a-i386.d: Likewise. * testsuite/ld-ifunc/ifunc-18a-x86-64.d: Likewise. * testsuite/ld-ifunc/ifunc-18b-i386.d: Likewise. * testsuite/ld-ifunc/ifunc-18b-x86-64.d: Likewise. * testsuite/ld-ifunc/ifunc-19a-i386.d: Likewise. * testsuite/ld-ifunc/ifunc-19a-x86-64.d: Likewise. * testsuite/ld-ifunc/ifunc-19b-i386.d: Likewise. * testsuite/ld-ifunc/ifunc-19b-x86-64.d: Likewise. * testsuite/ld-ifunc/ifunc-2-i386-now.d: Likewise. * testsuite/ld-ifunc/ifunc-2-i386.d: Likewise. * testsuite/ld-ifunc/ifunc-2-local-i386-now.d: Likewise. * testsuite/ld-ifunc/ifunc-2-local-i386.d: Likewise. * testsuite/ld-ifunc/ifunc-2-local-x86-64-now.d: Likewise. * testsuite/ld-ifunc/ifunc-2-local-x86-64.d: Likewise. * testsuite/ld-ifunc/ifunc-2-x86-64-now.d: Likewise. * testsuite/ld-ifunc/ifunc-2-x86-64.d: Likewise. * testsuite/ld-ifunc/ifunc-20-i386.d: Likewise. * testsuite/ld-ifunc/ifunc-20-x86-64.d: Likewise. * testsuite/ld-ifunc/ifunc-21-i386.d: Likewise. * testsuite/ld-ifunc/ifunc-21-x86-64.d: Likewise. * testsuite/ld-ifunc/ifunc-22-i386.d: Likewise. * testsuite/ld-ifunc/ifunc-22-x86-64.d: Likewise. * testsuite/ld-ifunc/ifunc-5a-i386.d: Likewise. * testsuite/ld-ifunc/ifunc-5a-local-i386.d: Likewise. * testsuite/ld-ifunc/ifunc-5a-local-x86-64.d: Likewise. * testsuite/ld-ifunc/ifunc-5a-x86-64.d: Likewise. * testsuite/ld-ifunc/ifunc-5b-i386.d: Likewise. * testsuite/ld-ifunc/ifunc-5b-local-i386.d: Likewise. * testsuite/ld-ifunc/ifunc-5b-local-x86-64.d: Likewise. * testsuite/ld-ifunc/ifunc-5b-x86-64.d: Likewise. * testsuite/ld-ifunc/ifunc-5r-local-i386.d: Likewise. * testsuite/ld-ifunc/ifunc-5r-local-x86-64.d: Likewise. * testsuite/ld-ifunc/ifunc-6a-i386.d: Likewise. * testsuite/ld-ifunc/ifunc-6a-x86-64.d: Likewise. * testsuite/ld-ifunc/ifunc-6b-i386.d: Likewise. * testsuite/ld-ifunc/ifunc-6b-x86-64.d: Likewise. * testsuite/ld-ifunc/ifunc-7a-i386.d: Likewise. * testsuite/ld-ifunc/ifunc-7a-x86-64.d: Likewise. * testsuite/ld-ifunc/ifunc-7b-i386.d: Likewise. * testsuite/ld-ifunc/ifunc-7b-x86-64.d: Likewise. * testsuite/ld-ifunc/ifunc-8-i386.d: Likewise. * testsuite/ld-ifunc/ifunc-8-x86-64.d: Likewise. * testsuite/ld-ifunc/ifunc-9-i386.d: Likewise. * testsuite/ld-ifunc/ifunc-9-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-plugin/lto.exp: Likewise. * testsuite/ld-x86-64/align-branch-1.d: Likewise. * testsuite/ld-x86-64/dwarfreloc.exp: Likewise. * testsuite/ld-x86-64/line.exp: Likewise. * testsuite/ld-x86-64/load1a.d: Likewise. * testsuite/ld-x86-64/load1b.d: Likewise. * testsuite/ld-x86-64/load1c.d: Likewise. * testsuite/ld-x86-64/load1d.d: Likewise. * testsuite/ld-x86-64/pie3.d: Likewise. * testsuite/ld-x86-64/pr18160.d: Likewise. * testsuite/ld-x86-64/pr19013-x32.d: Likewise. * testsuite/ld-x86-64/pr19013.d: Likewise. * testsuite/ld-x86-64/pr19636-2d.d: Likewise. * testsuite/ld-x86-64/pr19636-2l.d: Likewise. * testsuite/ld-x86-64/pr20253-1b.d: Likewise. * testsuite/ld-x86-64/pr20253-1d.d: Likewise. * testsuite/ld-x86-64/pr20253-1f.d: Likewise. * testsuite/ld-x86-64/pr20253-1h.d: Likewise. * testsuite/ld-x86-64/pr20253-1j.d: Likewise. * testsuite/ld-x86-64/pr20253-1l.d: Likewise. * testsuite/ld-x86-64/pr21884.d: Likewise. * testsuite/ld-x86-64/pr22393-3a.rd: Likewise. * testsuite/ld-x86-64/pr22393-3b.rd: Likewise. * testsuite/ld-x86-64/tlsgd10.dd: Likewise. * testsuite/ld-x86-64/tlsgd5.dd: Likewise. * testsuite/ld-x86-64/tlsgd8.dd: Likewise. * testsuite/ld-x86-64/x86-64.exp: Likewise. * emulparams/elf32_x86_64_nacl.sh: Removed. * emulparams/elf_i386_nacl.sh: Likewise. * emulparams/elf_x86_64_nacl.sh: Likewise. * testsuite/ld-i386/emit-relocs-nacl.rd: Likewise. * testsuite/ld-i386/load1-nacl.d: Likewise. * testsuite/ld-i386/pie1-nacl.d: Likewise. * testsuite/ld-i386/plt-nacl.pd: Likewise. * testsuite/ld-i386/plt-pic-nacl.pd: Likewise. * testsuite/ld-i386/pr17709-nacl.rd: Likewise. * testsuite/ld-i386/pr19636-1d-nacl.d: Likewise. * testsuite/ld-i386/pr19636-2c-nacl.d: Likewise. * testsuite/ld-i386/pr19636-2d-nacl.d: Likewise. * testsuite/ld-i386/pr19636-2e-nacl.d: Likewise. * testsuite/ld-i386/pr19827-nacl.rd: Likewise. * testsuite/ld-i386/pr21884-nacl.d: Likewise. * testsuite/ld-i386/pr21884-nacl.t: Likewise. * testsuite/ld-i386/tlsbin-nacl.rd: Likewise. * testsuite/ld-i386/tlsbin2-nacl.rd: Likewise. * testsuite/ld-i386/tlsbindesc-nacl.rd: Likewise. * testsuite/ld-i386/tlsdesc-nacl.rd: Likewise. * testsuite/ld-i386/tlsgdesc-nacl.rd: Likewise. * testsuite/ld-i386/tlsnopic-nacl.rd: Likewise. * testsuite/ld-i386/tlspic-nacl.rd: Likewise. * testsuite/ld-i386/tlspic2-nacl.rd: Likewise. * testsuite/ld-x86-64/ilp32-4-nacl.d: Likewise. * testsuite/ld-x86-64/load1a-nacl.d: Likewise. * testsuite/ld-x86-64/load1b-nacl.d: Likewise. * testsuite/ld-x86-64/load1c-nacl.d: Likewise. * testsuite/ld-x86-64/load1d-nacl.d: Likewise. * testsuite/ld-x86-64/pie3-nacl.d: Likewise. * testsuite/ld-x86-64/plt-nacl.pd: Likewise. * testsuite/ld-x86-64/pr17709-nacl.rd: Likewise. * testsuite/ld-x86-64/pr19013-nacl.d: Likewise. * testsuite/ld-x86-64/pr19636-2d-nacl.d: Likewise. * testsuite/ld-x86-64/pr19827-nacl.rd: Likewise. * testsuite/ld-x86-64/pr21884-nacl.d: Likewise. * testsuite/ld-x86-64/pr21884-nacl.t: Likewise. * testsuite/ld-x86-64/split-by-file-nacl.rd: Likewise. * testsuite/ld-x86-64/tlsbin-nacl.rd: Likewise. * testsuite/ld-x86-64/tlsbin2-nacl.rd: Likewise. * testsuite/ld-x86-64/tlsbindesc-nacl.rd: Likewise. * testsuite/ld-x86-64/tlsdesc-nacl.pd: Likewise. * testsuite/ld-x86-64/tlsdesc-nacl.rd: Likewise. * testsuite/ld-x86-64/tlsgdesc-nacl.rd: Likewise. * testsuite/ld-x86-64/tlspic-nacl.rd: Likewise. * testsuite/ld-x86-64/tlspic2-nacl.rd: Likewise. * Makefile.in: Regenerated. * po/BLD-POTFILES.in: Likewise.
2020-06-30 23:47:02 +08:00
#notarget: *-*-lynxos *-*-nto*
i386: Improve PLT generation and synthetic PLT symbols On i386, 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. 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 i386 backend_data. 2. Add generic, lay and non-lazy PLT layout configurations to i386 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 i386 setup_gnu_properties, based on PIC and target selection. PLT section alignment is also set to PLT entry size for non-NaCl/VxWorks target. 3. Remove elf_i386_create_dynamic_sections. create_dynamic_sections isn't always called, but GOT relocations need GOT relocations. Instead, create all i386 specific dynamic sections in i386 setup_gnu_properties, which initializes elf.dynobj, so that i386 check_relocs can be simplified. 4. Rewrite elf_i386_get_synthetic_symtab to check PLT sections against all dynamic relocations to support both lazy and non-lazy PLTs. bfd/ * elf32-i386.c (PLT_ENTRY_SIZE): Renamed to ... (LAZY_PLT_ENTRY_SIZE): This. (NON_LAZY_PLT_ENTRY_SIZE): New. (elf_i386_plt0_entry): Renamed to ... (elf_i386_lazy_plt0_entry): This. (elf_i386_plt_entry): Renamed to ... (elf_i386_lazy_plt_entry): This. (elf_i386_pic_plt0_entry): Renamed to ... (elf_i386_pic_lazy_plt0_entry): This. (elf_i386_pic_plt_entry): Renamed to ... (elf_i386_pic_lazy_plt_entry): This. (elf_i386_got_plt_entry): Renamed to ... (elf_i386_non_lazy_plt_entry): This. (elf_i386_pic_got_plt_entry): Renamed to ... (elf_i386_pic_non_lazy_plt_entry): This. (elf_i386_eh_frame_plt): Renamed to ... (elf_i386_eh_frame_lazy_plt): This. (elf_i386_eh_frame_plt_got): Renamed to ... (elf_i386_eh_frame_non_lazy_plt): This. (elf_i386_plt_layout): Renamed to ... (elf_i386_lazy_plt_layout): This. Remove eh_frame_plt_got and eh_frame_plt_got_size. (elf_i386_non_lazy_plt_layout): New. (elf_i386_plt_layout): Likewise. (elf_i386_non_lazy_plt): Likewise. (GET_PLT_ENTRY_SIZE): Removed. (elf_i386_plt): Renamed to ... (elf_i386_lazy_plt): This. (elf_i386_backend_data): Remove plt. Rename is_vxworks to os. (elf_i386_arch_bed): Updated. (elf_i386_link_hash_table): Add plt, lazy_plt and non_lazy_plt. (elf_i386_create_dynamic_sections): Removed. (elf_i386_check_relocs): Don't check elf.dynobj. Don't call _bfd_elf_create_ifunc_sections nor _bfd_elf_create_got_section. (elf_i386_adjust_dynamic_symbol): Updated. (elf_i386_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. (elf_i386_size_dynamic_sections): Updated. Check whether GOT output section is discarded only if GOT isn't empty. (elf_i386_relocate_section): Updated. Properly get PLT index if there is no PLT0. (elf_i386_finish_dynamic_symbol): Updated. Don't fill the second and third slots in the PLT entry if there is no PLT0. (elf_i386_finish_dynamic_sections): Updated. Don't fill PLT0 if there is no PLT0. Set sh_entsize on the .plt.got section. (elf_i386_nacl_plt): Forward declaration. (elf_i386_get_plt_sym_val): Removed. (elf_i386_get_synthetic_symtab): Rewrite to check PLT sections against all dynamic relocations. (elf_i386_link_setup_gnu_properties): New function. (elf_backend_create_dynamic_sections): Updated. (elf_backend_setup_gnu_properties): New. (elf_i386_nacl_plt): Updated. (elf_i386_nacl_arch_bed): Likewise. (elf_i386_vxworks_arch_bed): Likewise. ld/ * testsuite/ld-i386/i386.exp: Add some -z now tests. * testsuite/ld-i386/plt-pic2.dd: New file. * testsuite/ld-i386/plt2.dd: Likewise. * testsuite/ld-i386/plt2.rd: Likewise. * testsuite/ld-i386/plt2.s: Likewise. * testsuite/ld-ifunc/ifunc-16-i386-now.d: Likewise. * testsuite/ld-ifunc/ifunc-2-i386-now.d: Likewise. * testsuite/ld-ifunc/ifunc-2-local-i386-now.d: Likewise. * testsuite/ld-ifunc/pr17154-i386-now.d: Likewise. * testsuite/ld-i386/pr20830.d: Update the .plt.got section with func@plt.
2017-05-09 01:10:22 +08:00
.*: +file format .*
Disassembly of section .plt:
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.
2021-01-07 22:42:00 +08:00
0+e0 <\*ABS\*@plt-0x10>:
+[a-f0-9]+: ff b3 04 00 00 00 push 0x4\(%ebx\)
i386: Improve PLT generation and synthetic PLT symbols On i386, 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. 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 i386 backend_data. 2. Add generic, lay and non-lazy PLT layout configurations to i386 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 i386 setup_gnu_properties, based on PIC and target selection. PLT section alignment is also set to PLT entry size for non-NaCl/VxWorks target. 3. Remove elf_i386_create_dynamic_sections. create_dynamic_sections isn't always called, but GOT relocations need GOT relocations. Instead, create all i386 specific dynamic sections in i386 setup_gnu_properties, which initializes elf.dynobj, so that i386 check_relocs can be simplified. 4. Rewrite elf_i386_get_synthetic_symtab to check PLT sections against all dynamic relocations to support both lazy and non-lazy PLTs. bfd/ * elf32-i386.c (PLT_ENTRY_SIZE): Renamed to ... (LAZY_PLT_ENTRY_SIZE): This. (NON_LAZY_PLT_ENTRY_SIZE): New. (elf_i386_plt0_entry): Renamed to ... (elf_i386_lazy_plt0_entry): This. (elf_i386_plt_entry): Renamed to ... (elf_i386_lazy_plt_entry): This. (elf_i386_pic_plt0_entry): Renamed to ... (elf_i386_pic_lazy_plt0_entry): This. (elf_i386_pic_plt_entry): Renamed to ... (elf_i386_pic_lazy_plt_entry): This. (elf_i386_got_plt_entry): Renamed to ... (elf_i386_non_lazy_plt_entry): This. (elf_i386_pic_got_plt_entry): Renamed to ... (elf_i386_pic_non_lazy_plt_entry): This. (elf_i386_eh_frame_plt): Renamed to ... (elf_i386_eh_frame_lazy_plt): This. (elf_i386_eh_frame_plt_got): Renamed to ... (elf_i386_eh_frame_non_lazy_plt): This. (elf_i386_plt_layout): Renamed to ... (elf_i386_lazy_plt_layout): This. Remove eh_frame_plt_got and eh_frame_plt_got_size. (elf_i386_non_lazy_plt_layout): New. (elf_i386_plt_layout): Likewise. (elf_i386_non_lazy_plt): Likewise. (GET_PLT_ENTRY_SIZE): Removed. (elf_i386_plt): Renamed to ... (elf_i386_lazy_plt): This. (elf_i386_backend_data): Remove plt. Rename is_vxworks to os. (elf_i386_arch_bed): Updated. (elf_i386_link_hash_table): Add plt, lazy_plt and non_lazy_plt. (elf_i386_create_dynamic_sections): Removed. (elf_i386_check_relocs): Don't check elf.dynobj. Don't call _bfd_elf_create_ifunc_sections nor _bfd_elf_create_got_section. (elf_i386_adjust_dynamic_symbol): Updated. (elf_i386_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. (elf_i386_size_dynamic_sections): Updated. Check whether GOT output section is discarded only if GOT isn't empty. (elf_i386_relocate_section): Updated. Properly get PLT index if there is no PLT0. (elf_i386_finish_dynamic_symbol): Updated. Don't fill the second and third slots in the PLT entry if there is no PLT0. (elf_i386_finish_dynamic_sections): Updated. Don't fill PLT0 if there is no PLT0. Set sh_entsize on the .plt.got section. (elf_i386_nacl_plt): Forward declaration. (elf_i386_get_plt_sym_val): Removed. (elf_i386_get_synthetic_symtab): Rewrite to check PLT sections against all dynamic relocations. (elf_i386_link_setup_gnu_properties): New function. (elf_backend_create_dynamic_sections): Updated. (elf_backend_setup_gnu_properties): New. (elf_i386_nacl_plt): Updated. (elf_i386_nacl_arch_bed): Likewise. (elf_i386_vxworks_arch_bed): Likewise. ld/ * testsuite/ld-i386/i386.exp: Add some -z now tests. * testsuite/ld-i386/plt-pic2.dd: New file. * testsuite/ld-i386/plt2.dd: Likewise. * testsuite/ld-i386/plt2.rd: Likewise. * testsuite/ld-i386/plt2.s: Likewise. * testsuite/ld-ifunc/ifunc-16-i386-now.d: Likewise. * testsuite/ld-ifunc/ifunc-2-i386-now.d: Likewise. * testsuite/ld-ifunc/ifunc-2-local-i386-now.d: Likewise. * testsuite/ld-ifunc/pr17154-i386-now.d: Likewise. * testsuite/ld-i386/pr20830.d: Update the .plt.got section with func@plt.
2017-05-09 01:10:22 +08:00
+[a-f0-9]+: ff a3 08 00 00 00 jmp \*0x8\(%ebx\)
+[a-f0-9]+: 00 00 add %al,\(%eax\)
...
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.
2018-06-08 18:47:34 +08:00
0+f0 <\*ABS\*@plt>:
i386: Improve PLT generation and synthetic PLT symbols On i386, 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. 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 i386 backend_data. 2. Add generic, lay and non-lazy PLT layout configurations to i386 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 i386 setup_gnu_properties, based on PIC and target selection. PLT section alignment is also set to PLT entry size for non-NaCl/VxWorks target. 3. Remove elf_i386_create_dynamic_sections. create_dynamic_sections isn't always called, but GOT relocations need GOT relocations. Instead, create all i386 specific dynamic sections in i386 setup_gnu_properties, which initializes elf.dynobj, so that i386 check_relocs can be simplified. 4. Rewrite elf_i386_get_synthetic_symtab to check PLT sections against all dynamic relocations to support both lazy and non-lazy PLTs. bfd/ * elf32-i386.c (PLT_ENTRY_SIZE): Renamed to ... (LAZY_PLT_ENTRY_SIZE): This. (NON_LAZY_PLT_ENTRY_SIZE): New. (elf_i386_plt0_entry): Renamed to ... (elf_i386_lazy_plt0_entry): This. (elf_i386_plt_entry): Renamed to ... (elf_i386_lazy_plt_entry): This. (elf_i386_pic_plt0_entry): Renamed to ... (elf_i386_pic_lazy_plt0_entry): This. (elf_i386_pic_plt_entry): Renamed to ... (elf_i386_pic_lazy_plt_entry): This. (elf_i386_got_plt_entry): Renamed to ... (elf_i386_non_lazy_plt_entry): This. (elf_i386_pic_got_plt_entry): Renamed to ... (elf_i386_pic_non_lazy_plt_entry): This. (elf_i386_eh_frame_plt): Renamed to ... (elf_i386_eh_frame_lazy_plt): This. (elf_i386_eh_frame_plt_got): Renamed to ... (elf_i386_eh_frame_non_lazy_plt): This. (elf_i386_plt_layout): Renamed to ... (elf_i386_lazy_plt_layout): This. Remove eh_frame_plt_got and eh_frame_plt_got_size. (elf_i386_non_lazy_plt_layout): New. (elf_i386_plt_layout): Likewise. (elf_i386_non_lazy_plt): Likewise. (GET_PLT_ENTRY_SIZE): Removed. (elf_i386_plt): Renamed to ... (elf_i386_lazy_plt): This. (elf_i386_backend_data): Remove plt. Rename is_vxworks to os. (elf_i386_arch_bed): Updated. (elf_i386_link_hash_table): Add plt, lazy_plt and non_lazy_plt. (elf_i386_create_dynamic_sections): Removed. (elf_i386_check_relocs): Don't check elf.dynobj. Don't call _bfd_elf_create_ifunc_sections nor _bfd_elf_create_got_section. (elf_i386_adjust_dynamic_symbol): Updated. (elf_i386_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. (elf_i386_size_dynamic_sections): Updated. Check whether GOT output section is discarded only if GOT isn't empty. (elf_i386_relocate_section): Updated. Properly get PLT index if there is no PLT0. (elf_i386_finish_dynamic_symbol): Updated. Don't fill the second and third slots in the PLT entry if there is no PLT0. (elf_i386_finish_dynamic_sections): Updated. Don't fill PLT0 if there is no PLT0. Set sh_entsize on the .plt.got section. (elf_i386_nacl_plt): Forward declaration. (elf_i386_get_plt_sym_val): Removed. (elf_i386_get_synthetic_symtab): Rewrite to check PLT sections against all dynamic relocations. (elf_i386_link_setup_gnu_properties): New function. (elf_backend_create_dynamic_sections): Updated. (elf_backend_setup_gnu_properties): New. (elf_i386_nacl_plt): Updated. (elf_i386_nacl_arch_bed): Likewise. (elf_i386_vxworks_arch_bed): Likewise. ld/ * testsuite/ld-i386/i386.exp: Add some -z now tests. * testsuite/ld-i386/plt-pic2.dd: New file. * testsuite/ld-i386/plt2.dd: Likewise. * testsuite/ld-i386/plt2.rd: Likewise. * testsuite/ld-i386/plt2.s: Likewise. * testsuite/ld-ifunc/ifunc-16-i386-now.d: Likewise. * testsuite/ld-ifunc/ifunc-2-i386-now.d: Likewise. * testsuite/ld-ifunc/ifunc-2-local-i386-now.d: Likewise. * testsuite/ld-ifunc/pr17154-i386-now.d: Likewise. * testsuite/ld-i386/pr20830.d: Update the .plt.got section with func@plt.
2017-05-09 01:10:22 +08:00
+[a-f0-9]+: ff a3 0c 00 00 00 jmp \*0xc\(%ebx\)
+[a-f0-9]+: 68 00 00 00 00 push \$0x0
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.
2021-01-07 22:42:00 +08:00
+[a-f0-9]+: e9 e0 ff ff ff jmp e0 <\*ABS\*@plt-0x10>
i386: Improve PLT generation and synthetic PLT symbols On i386, 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. 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 i386 backend_data. 2. Add generic, lay and non-lazy PLT layout configurations to i386 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 i386 setup_gnu_properties, based on PIC and target selection. PLT section alignment is also set to PLT entry size for non-NaCl/VxWorks target. 3. Remove elf_i386_create_dynamic_sections. create_dynamic_sections isn't always called, but GOT relocations need GOT relocations. Instead, create all i386 specific dynamic sections in i386 setup_gnu_properties, which initializes elf.dynobj, so that i386 check_relocs can be simplified. 4. Rewrite elf_i386_get_synthetic_symtab to check PLT sections against all dynamic relocations to support both lazy and non-lazy PLTs. bfd/ * elf32-i386.c (PLT_ENTRY_SIZE): Renamed to ... (LAZY_PLT_ENTRY_SIZE): This. (NON_LAZY_PLT_ENTRY_SIZE): New. (elf_i386_plt0_entry): Renamed to ... (elf_i386_lazy_plt0_entry): This. (elf_i386_plt_entry): Renamed to ... (elf_i386_lazy_plt_entry): This. (elf_i386_pic_plt0_entry): Renamed to ... (elf_i386_pic_lazy_plt0_entry): This. (elf_i386_pic_plt_entry): Renamed to ... (elf_i386_pic_lazy_plt_entry): This. (elf_i386_got_plt_entry): Renamed to ... (elf_i386_non_lazy_plt_entry): This. (elf_i386_pic_got_plt_entry): Renamed to ... (elf_i386_pic_non_lazy_plt_entry): This. (elf_i386_eh_frame_plt): Renamed to ... (elf_i386_eh_frame_lazy_plt): This. (elf_i386_eh_frame_plt_got): Renamed to ... (elf_i386_eh_frame_non_lazy_plt): This. (elf_i386_plt_layout): Renamed to ... (elf_i386_lazy_plt_layout): This. Remove eh_frame_plt_got and eh_frame_plt_got_size. (elf_i386_non_lazy_plt_layout): New. (elf_i386_plt_layout): Likewise. (elf_i386_non_lazy_plt): Likewise. (GET_PLT_ENTRY_SIZE): Removed. (elf_i386_plt): Renamed to ... (elf_i386_lazy_plt): This. (elf_i386_backend_data): Remove plt. Rename is_vxworks to os. (elf_i386_arch_bed): Updated. (elf_i386_link_hash_table): Add plt, lazy_plt and non_lazy_plt. (elf_i386_create_dynamic_sections): Removed. (elf_i386_check_relocs): Don't check elf.dynobj. Don't call _bfd_elf_create_ifunc_sections nor _bfd_elf_create_got_section. (elf_i386_adjust_dynamic_symbol): Updated. (elf_i386_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. (elf_i386_size_dynamic_sections): Updated. Check whether GOT output section is discarded only if GOT isn't empty. (elf_i386_relocate_section): Updated. Properly get PLT index if there is no PLT0. (elf_i386_finish_dynamic_symbol): Updated. Don't fill the second and third slots in the PLT entry if there is no PLT0. (elf_i386_finish_dynamic_sections): Updated. Don't fill PLT0 if there is no PLT0. Set sh_entsize on the .plt.got section. (elf_i386_nacl_plt): Forward declaration. (elf_i386_get_plt_sym_val): Removed. (elf_i386_get_synthetic_symtab): Rewrite to check PLT sections against all dynamic relocations. (elf_i386_link_setup_gnu_properties): New function. (elf_backend_create_dynamic_sections): Updated. (elf_backend_setup_gnu_properties): New. (elf_i386_nacl_plt): Updated. (elf_i386_nacl_arch_bed): Likewise. (elf_i386_vxworks_arch_bed): Likewise. ld/ * testsuite/ld-i386/i386.exp: Add some -z now tests. * testsuite/ld-i386/plt-pic2.dd: New file. * testsuite/ld-i386/plt2.dd: Likewise. * testsuite/ld-i386/plt2.rd: Likewise. * testsuite/ld-i386/plt2.s: Likewise. * testsuite/ld-ifunc/ifunc-16-i386-now.d: Likewise. * testsuite/ld-ifunc/ifunc-2-i386-now.d: Likewise. * testsuite/ld-ifunc/ifunc-2-local-i386-now.d: Likewise. * testsuite/ld-ifunc/pr17154-i386-now.d: Likewise. * testsuite/ld-i386/pr20830.d: Update the .plt.got section with func@plt.
2017-05-09 01:10:22 +08:00
Disassembly of section .text:
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.
2018-06-08 18:47:34 +08:00
0+100 <__GI_foo>:
opcodes/i386: remove trailing whitespace from insns with zero operands While working on another patch[1] I had need to touch this code in i386-dis.c: ins->obufp = ins->mnemonicendp; for (i = strlen (ins->obuf) + prefix_length; i < 6; i++) oappend (ins, " "); oappend (ins, " "); (*ins->info->fprintf_styled_func) (ins->info->stream, dis_style_mnemonic, "%s", ins->obuf); What this code does is add whitespace after the instruction mnemonic and before the instruction operands. The problem I ran into when working on this code can be seen by assembling this input file: .text nop retq Now, when I disassemble, here's the output. I've replaced trailing whitespace with '_' so that the issue is clearer: Disassembly of section .text: 0000000000000000 <.text>: 0: 90 nop 1: c3 retq___ Notice that there's no trailing whitespace after 'nop', but there are three spaces after 'retq'! What happens is that instruction mnemonics are emitted into a buffer instr_info::obuf, then instr_info::mnemonicendp is setup to point to the '\0' character at the end of the mnemonic. When we emit the whitespace, this is then added starting at the mnemonicendp position. Lets consider 'retq', first the buffer is setup like this: 'r' 'e' 't' 'q' '\0' Then we add whitespace characters at the '\0', converting the buffer to this: 'r' 'e' 't' 'q' ' ' ' ' ' ' '\0' However, 'nop' is actually an alias for 'xchg %rax,%rax', so, initially, the buffer is setup like this: 'x' 'c' 'h' 'g' '\0' Then in NOP_Fixup we spot that we have an instruction that is an alias for 'nop', and adjust the buffer to this: 'n' 'o' 'p' '\0' '\0' The second '\0' is left over from the original buffer contents. However, when we rewrite the buffer, we don't afjust mnemonicendp, which still points at the second '\0' character. Now, when we insert whitespace we get: 'n' 'o' 'p' '\0' ' ' ' ' ' ' ' ' '\0' Notice the whitespace is inserted after the first '\0', so, when we print the buffer, the whitespace is not printed. The fix for this is pretty easy, I can change NOP_Fixup to adjust mnemonicendp, but now a bunch of tests start failing, we now produce whitespace after the 'nop', which the tests don't expect. So, I could update the tests to expect the whitespace.... ...except I'm not a fan of trailing whitespace, so I'd really rather not. Turns out, I can pretty easily update the whitespace emitting code to spot instructions that have zero operands and just not emit any whitespace in this case. So this is what I've done. I've left in the fix for NOP_Fixup, I think updating mnemonicendp is probably a good thing, though this is not really required any more. I've then updated all the tests that I saw failing to adjust the expected patterns to account for the change in whitespace. [1] https://sourceware.org/pipermail/binutils/2022-April/120610.html
2022-05-26 20:11:11 +08:00
+[a-f0-9]+: c3 ret
i386: Improve PLT generation and synthetic PLT symbols On i386, 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. 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 i386 backend_data. 2. Add generic, lay and non-lazy PLT layout configurations to i386 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 i386 setup_gnu_properties, based on PIC and target selection. PLT section alignment is also set to PLT entry size for non-NaCl/VxWorks target. 3. Remove elf_i386_create_dynamic_sections. create_dynamic_sections isn't always called, but GOT relocations need GOT relocations. Instead, create all i386 specific dynamic sections in i386 setup_gnu_properties, which initializes elf.dynobj, so that i386 check_relocs can be simplified. 4. Rewrite elf_i386_get_synthetic_symtab to check PLT sections against all dynamic relocations to support both lazy and non-lazy PLTs. bfd/ * elf32-i386.c (PLT_ENTRY_SIZE): Renamed to ... (LAZY_PLT_ENTRY_SIZE): This. (NON_LAZY_PLT_ENTRY_SIZE): New. (elf_i386_plt0_entry): Renamed to ... (elf_i386_lazy_plt0_entry): This. (elf_i386_plt_entry): Renamed to ... (elf_i386_lazy_plt_entry): This. (elf_i386_pic_plt0_entry): Renamed to ... (elf_i386_pic_lazy_plt0_entry): This. (elf_i386_pic_plt_entry): Renamed to ... (elf_i386_pic_lazy_plt_entry): This. (elf_i386_got_plt_entry): Renamed to ... (elf_i386_non_lazy_plt_entry): This. (elf_i386_pic_got_plt_entry): Renamed to ... (elf_i386_pic_non_lazy_plt_entry): This. (elf_i386_eh_frame_plt): Renamed to ... (elf_i386_eh_frame_lazy_plt): This. (elf_i386_eh_frame_plt_got): Renamed to ... (elf_i386_eh_frame_non_lazy_plt): This. (elf_i386_plt_layout): Renamed to ... (elf_i386_lazy_plt_layout): This. Remove eh_frame_plt_got and eh_frame_plt_got_size. (elf_i386_non_lazy_plt_layout): New. (elf_i386_plt_layout): Likewise. (elf_i386_non_lazy_plt): Likewise. (GET_PLT_ENTRY_SIZE): Removed. (elf_i386_plt): Renamed to ... (elf_i386_lazy_plt): This. (elf_i386_backend_data): Remove plt. Rename is_vxworks to os. (elf_i386_arch_bed): Updated. (elf_i386_link_hash_table): Add plt, lazy_plt and non_lazy_plt. (elf_i386_create_dynamic_sections): Removed. (elf_i386_check_relocs): Don't check elf.dynobj. Don't call _bfd_elf_create_ifunc_sections nor _bfd_elf_create_got_section. (elf_i386_adjust_dynamic_symbol): Updated. (elf_i386_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. (elf_i386_size_dynamic_sections): Updated. Check whether GOT output section is discarded only if GOT isn't empty. (elf_i386_relocate_section): Updated. Properly get PLT index if there is no PLT0. (elf_i386_finish_dynamic_symbol): Updated. Don't fill the second and third slots in the PLT entry if there is no PLT0. (elf_i386_finish_dynamic_sections): Updated. Don't fill PLT0 if there is no PLT0. Set sh_entsize on the .plt.got section. (elf_i386_nacl_plt): Forward declaration. (elf_i386_get_plt_sym_val): Removed. (elf_i386_get_synthetic_symtab): Rewrite to check PLT sections against all dynamic relocations. (elf_i386_link_setup_gnu_properties): New function. (elf_backend_create_dynamic_sections): Updated. (elf_backend_setup_gnu_properties): New. (elf_i386_nacl_plt): Updated. (elf_i386_nacl_arch_bed): Likewise. (elf_i386_vxworks_arch_bed): Likewise. ld/ * testsuite/ld-i386/i386.exp: Add some -z now tests. * testsuite/ld-i386/plt-pic2.dd: New file. * testsuite/ld-i386/plt2.dd: Likewise. * testsuite/ld-i386/plt2.rd: Likewise. * testsuite/ld-i386/plt2.s: Likewise. * testsuite/ld-ifunc/ifunc-16-i386-now.d: Likewise. * testsuite/ld-ifunc/ifunc-2-i386-now.d: Likewise. * testsuite/ld-ifunc/ifunc-2-local-i386-now.d: Likewise. * testsuite/ld-ifunc/pr17154-i386-now.d: Likewise. * testsuite/ld-i386/pr20830.d: Update the .plt.got section with func@plt.
2017-05-09 01:10:22 +08:00
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.
2018-06-08 18:47:34 +08:00
0+101 <bar>:
+[a-f0-9]+: e8 00 00 00 00 call 106 <bar\+0x5>
i386: Improve PLT generation and synthetic PLT symbols On i386, 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. 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 i386 backend_data. 2. Add generic, lay and non-lazy PLT layout configurations to i386 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 i386 setup_gnu_properties, based on PIC and target selection. PLT section alignment is also set to PLT entry size for non-NaCl/VxWorks target. 3. Remove elf_i386_create_dynamic_sections. create_dynamic_sections isn't always called, but GOT relocations need GOT relocations. Instead, create all i386 specific dynamic sections in i386 setup_gnu_properties, which initializes elf.dynobj, so that i386 check_relocs can be simplified. 4. Rewrite elf_i386_get_synthetic_symtab to check PLT sections against all dynamic relocations to support both lazy and non-lazy PLTs. bfd/ * elf32-i386.c (PLT_ENTRY_SIZE): Renamed to ... (LAZY_PLT_ENTRY_SIZE): This. (NON_LAZY_PLT_ENTRY_SIZE): New. (elf_i386_plt0_entry): Renamed to ... (elf_i386_lazy_plt0_entry): This. (elf_i386_plt_entry): Renamed to ... (elf_i386_lazy_plt_entry): This. (elf_i386_pic_plt0_entry): Renamed to ... (elf_i386_pic_lazy_plt0_entry): This. (elf_i386_pic_plt_entry): Renamed to ... (elf_i386_pic_lazy_plt_entry): This. (elf_i386_got_plt_entry): Renamed to ... (elf_i386_non_lazy_plt_entry): This. (elf_i386_pic_got_plt_entry): Renamed to ... (elf_i386_pic_non_lazy_plt_entry): This. (elf_i386_eh_frame_plt): Renamed to ... (elf_i386_eh_frame_lazy_plt): This. (elf_i386_eh_frame_plt_got): Renamed to ... (elf_i386_eh_frame_non_lazy_plt): This. (elf_i386_plt_layout): Renamed to ... (elf_i386_lazy_plt_layout): This. Remove eh_frame_plt_got and eh_frame_plt_got_size. (elf_i386_non_lazy_plt_layout): New. (elf_i386_plt_layout): Likewise. (elf_i386_non_lazy_plt): Likewise. (GET_PLT_ENTRY_SIZE): Removed. (elf_i386_plt): Renamed to ... (elf_i386_lazy_plt): This. (elf_i386_backend_data): Remove plt. Rename is_vxworks to os. (elf_i386_arch_bed): Updated. (elf_i386_link_hash_table): Add plt, lazy_plt and non_lazy_plt. (elf_i386_create_dynamic_sections): Removed. (elf_i386_check_relocs): Don't check elf.dynobj. Don't call _bfd_elf_create_ifunc_sections nor _bfd_elf_create_got_section. (elf_i386_adjust_dynamic_symbol): Updated. (elf_i386_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. (elf_i386_size_dynamic_sections): Updated. Check whether GOT output section is discarded only if GOT isn't empty. (elf_i386_relocate_section): Updated. Properly get PLT index if there is no PLT0. (elf_i386_finish_dynamic_symbol): Updated. Don't fill the second and third slots in the PLT entry if there is no PLT0. (elf_i386_finish_dynamic_sections): Updated. Don't fill PLT0 if there is no PLT0. Set sh_entsize on the .plt.got section. (elf_i386_nacl_plt): Forward declaration. (elf_i386_get_plt_sym_val): Removed. (elf_i386_get_synthetic_symtab): Rewrite to check PLT sections against all dynamic relocations. (elf_i386_link_setup_gnu_properties): New function. (elf_backend_create_dynamic_sections): Updated. (elf_backend_setup_gnu_properties): New. (elf_i386_nacl_plt): Updated. (elf_i386_nacl_arch_bed): Likewise. (elf_i386_vxworks_arch_bed): Likewise. ld/ * testsuite/ld-i386/i386.exp: Add some -z now tests. * testsuite/ld-i386/plt-pic2.dd: New file. * testsuite/ld-i386/plt2.dd: Likewise. * testsuite/ld-i386/plt2.rd: Likewise. * testsuite/ld-i386/plt2.s: Likewise. * testsuite/ld-ifunc/ifunc-16-i386-now.d: Likewise. * testsuite/ld-ifunc/ifunc-2-i386-now.d: Likewise. * testsuite/ld-ifunc/ifunc-2-local-i386-now.d: Likewise. * testsuite/ld-ifunc/pr17154-i386-now.d: Likewise. * testsuite/ld-i386/pr20830.d: Update the .plt.got section with func@plt.
2017-05-09 01:10:22 +08:00
+[a-f0-9]+: 5b pop %ebx
+[a-f0-9]+: 81 c3 9e 10 00 00 add \$0x109e,%ebx
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.
2018-06-08 18:47:34 +08:00
+[a-f0-9]+: e8 de ff ff ff call f0 <\*ABS\*@plt>
i386: Improve PLT generation and synthetic PLT symbols On i386, 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. 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 i386 backend_data. 2. Add generic, lay and non-lazy PLT layout configurations to i386 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 i386 setup_gnu_properties, based on PIC and target selection. PLT section alignment is also set to PLT entry size for non-NaCl/VxWorks target. 3. Remove elf_i386_create_dynamic_sections. create_dynamic_sections isn't always called, but GOT relocations need GOT relocations. Instead, create all i386 specific dynamic sections in i386 setup_gnu_properties, which initializes elf.dynobj, so that i386 check_relocs can be simplified. 4. Rewrite elf_i386_get_synthetic_symtab to check PLT sections against all dynamic relocations to support both lazy and non-lazy PLTs. bfd/ * elf32-i386.c (PLT_ENTRY_SIZE): Renamed to ... (LAZY_PLT_ENTRY_SIZE): This. (NON_LAZY_PLT_ENTRY_SIZE): New. (elf_i386_plt0_entry): Renamed to ... (elf_i386_lazy_plt0_entry): This. (elf_i386_plt_entry): Renamed to ... (elf_i386_lazy_plt_entry): This. (elf_i386_pic_plt0_entry): Renamed to ... (elf_i386_pic_lazy_plt0_entry): This. (elf_i386_pic_plt_entry): Renamed to ... (elf_i386_pic_lazy_plt_entry): This. (elf_i386_got_plt_entry): Renamed to ... (elf_i386_non_lazy_plt_entry): This. (elf_i386_pic_got_plt_entry): Renamed to ... (elf_i386_pic_non_lazy_plt_entry): This. (elf_i386_eh_frame_plt): Renamed to ... (elf_i386_eh_frame_lazy_plt): This. (elf_i386_eh_frame_plt_got): Renamed to ... (elf_i386_eh_frame_non_lazy_plt): This. (elf_i386_plt_layout): Renamed to ... (elf_i386_lazy_plt_layout): This. Remove eh_frame_plt_got and eh_frame_plt_got_size. (elf_i386_non_lazy_plt_layout): New. (elf_i386_plt_layout): Likewise. (elf_i386_non_lazy_plt): Likewise. (GET_PLT_ENTRY_SIZE): Removed. (elf_i386_plt): Renamed to ... (elf_i386_lazy_plt): This. (elf_i386_backend_data): Remove plt. Rename is_vxworks to os. (elf_i386_arch_bed): Updated. (elf_i386_link_hash_table): Add plt, lazy_plt and non_lazy_plt. (elf_i386_create_dynamic_sections): Removed. (elf_i386_check_relocs): Don't check elf.dynobj. Don't call _bfd_elf_create_ifunc_sections nor _bfd_elf_create_got_section. (elf_i386_adjust_dynamic_symbol): Updated. (elf_i386_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. (elf_i386_size_dynamic_sections): Updated. Check whether GOT output section is discarded only if GOT isn't empty. (elf_i386_relocate_section): Updated. Properly get PLT index if there is no PLT0. (elf_i386_finish_dynamic_symbol): Updated. Don't fill the second and third slots in the PLT entry if there is no PLT0. (elf_i386_finish_dynamic_sections): Updated. Don't fill PLT0 if there is no PLT0. Set sh_entsize on the .plt.got section. (elf_i386_nacl_plt): Forward declaration. (elf_i386_get_plt_sym_val): Removed. (elf_i386_get_synthetic_symtab): Rewrite to check PLT sections against all dynamic relocations. (elf_i386_link_setup_gnu_properties): New function. (elf_backend_create_dynamic_sections): Updated. (elf_backend_setup_gnu_properties): New. (elf_i386_nacl_plt): Updated. (elf_i386_nacl_arch_bed): Likewise. (elf_i386_vxworks_arch_bed): Likewise. ld/ * testsuite/ld-i386/i386.exp: Add some -z now tests. * testsuite/ld-i386/plt-pic2.dd: New file. * testsuite/ld-i386/plt2.dd: Likewise. * testsuite/ld-i386/plt2.rd: Likewise. * testsuite/ld-i386/plt2.s: Likewise. * testsuite/ld-ifunc/ifunc-16-i386-now.d: Likewise. * testsuite/ld-ifunc/ifunc-2-i386-now.d: Likewise. * testsuite/ld-ifunc/ifunc-2-local-i386-now.d: Likewise. * testsuite/ld-ifunc/pr17154-i386-now.d: Likewise. * testsuite/ld-i386/pr20830.d: Update the .plt.got section with func@plt.
2017-05-09 01:10:22 +08:00
+[a-f0-9]+: 8d 83 4c ef ff ff lea -0x10b4\(%ebx\),%eax
opcodes/i386: remove trailing whitespace from insns with zero operands While working on another patch[1] I had need to touch this code in i386-dis.c: ins->obufp = ins->mnemonicendp; for (i = strlen (ins->obuf) + prefix_length; i < 6; i++) oappend (ins, " "); oappend (ins, " "); (*ins->info->fprintf_styled_func) (ins->info->stream, dis_style_mnemonic, "%s", ins->obuf); What this code does is add whitespace after the instruction mnemonic and before the instruction operands. The problem I ran into when working on this code can be seen by assembling this input file: .text nop retq Now, when I disassemble, here's the output. I've replaced trailing whitespace with '_' so that the issue is clearer: Disassembly of section .text: 0000000000000000 <.text>: 0: 90 nop 1: c3 retq___ Notice that there's no trailing whitespace after 'nop', but there are three spaces after 'retq'! What happens is that instruction mnemonics are emitted into a buffer instr_info::obuf, then instr_info::mnemonicendp is setup to point to the '\0' character at the end of the mnemonic. When we emit the whitespace, this is then added starting at the mnemonicendp position. Lets consider 'retq', first the buffer is setup like this: 'r' 'e' 't' 'q' '\0' Then we add whitespace characters at the '\0', converting the buffer to this: 'r' 'e' 't' 'q' ' ' ' ' ' ' '\0' However, 'nop' is actually an alias for 'xchg %rax,%rax', so, initially, the buffer is setup like this: 'x' 'c' 'h' 'g' '\0' Then in NOP_Fixup we spot that we have an instruction that is an alias for 'nop', and adjust the buffer to this: 'n' 'o' 'p' '\0' '\0' The second '\0' is left over from the original buffer contents. However, when we rewrite the buffer, we don't afjust mnemonicendp, which still points at the second '\0' character. Now, when we insert whitespace we get: 'n' 'o' 'p' '\0' ' ' ' ' ' ' ' ' '\0' Notice the whitespace is inserted after the first '\0', so, when we print the buffer, the whitespace is not printed. The fix for this is pretty easy, I can change NOP_Fixup to adjust mnemonicendp, but now a bunch of tests start failing, we now produce whitespace after the 'nop', which the tests don't expect. So, I could update the tests to expect the whitespace.... ...except I'm not a fan of trailing whitespace, so I'd really rather not. Turns out, I can pretty easily update the whitespace emitting code to spot instructions that have zero operands and just not emit any whitespace in this case. So this is what I've done. I've left in the fix for NOP_Fixup, I think updating mnemonicendp is probably a good thing, though this is not really required any more. I've then updated all the tests that I saw failing to adjust the expected patterns to account for the change in whitespace. [1] https://sourceware.org/pipermail/binutils/2022-April/120610.html
2022-05-26 20:11:11 +08:00
+[a-f0-9]+: c3 ret
i386: Improve PLT generation and synthetic PLT symbols On i386, 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. 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 i386 backend_data. 2. Add generic, lay and non-lazy PLT layout configurations to i386 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 i386 setup_gnu_properties, based on PIC and target selection. PLT section alignment is also set to PLT entry size for non-NaCl/VxWorks target. 3. Remove elf_i386_create_dynamic_sections. create_dynamic_sections isn't always called, but GOT relocations need GOT relocations. Instead, create all i386 specific dynamic sections in i386 setup_gnu_properties, which initializes elf.dynobj, so that i386 check_relocs can be simplified. 4. Rewrite elf_i386_get_synthetic_symtab to check PLT sections against all dynamic relocations to support both lazy and non-lazy PLTs. bfd/ * elf32-i386.c (PLT_ENTRY_SIZE): Renamed to ... (LAZY_PLT_ENTRY_SIZE): This. (NON_LAZY_PLT_ENTRY_SIZE): New. (elf_i386_plt0_entry): Renamed to ... (elf_i386_lazy_plt0_entry): This. (elf_i386_plt_entry): Renamed to ... (elf_i386_lazy_plt_entry): This. (elf_i386_pic_plt0_entry): Renamed to ... (elf_i386_pic_lazy_plt0_entry): This. (elf_i386_pic_plt_entry): Renamed to ... (elf_i386_pic_lazy_plt_entry): This. (elf_i386_got_plt_entry): Renamed to ... (elf_i386_non_lazy_plt_entry): This. (elf_i386_pic_got_plt_entry): Renamed to ... (elf_i386_pic_non_lazy_plt_entry): This. (elf_i386_eh_frame_plt): Renamed to ... (elf_i386_eh_frame_lazy_plt): This. (elf_i386_eh_frame_plt_got): Renamed to ... (elf_i386_eh_frame_non_lazy_plt): This. (elf_i386_plt_layout): Renamed to ... (elf_i386_lazy_plt_layout): This. Remove eh_frame_plt_got and eh_frame_plt_got_size. (elf_i386_non_lazy_plt_layout): New. (elf_i386_plt_layout): Likewise. (elf_i386_non_lazy_plt): Likewise. (GET_PLT_ENTRY_SIZE): Removed. (elf_i386_plt): Renamed to ... (elf_i386_lazy_plt): This. (elf_i386_backend_data): Remove plt. Rename is_vxworks to os. (elf_i386_arch_bed): Updated. (elf_i386_link_hash_table): Add plt, lazy_plt and non_lazy_plt. (elf_i386_create_dynamic_sections): Removed. (elf_i386_check_relocs): Don't check elf.dynobj. Don't call _bfd_elf_create_ifunc_sections nor _bfd_elf_create_got_section. (elf_i386_adjust_dynamic_symbol): Updated. (elf_i386_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. (elf_i386_size_dynamic_sections): Updated. Check whether GOT output section is discarded only if GOT isn't empty. (elf_i386_relocate_section): Updated. Properly get PLT index if there is no PLT0. (elf_i386_finish_dynamic_symbol): Updated. Don't fill the second and third slots in the PLT entry if there is no PLT0. (elf_i386_finish_dynamic_sections): Updated. Don't fill PLT0 if there is no PLT0. Set sh_entsize on the .plt.got section. (elf_i386_nacl_plt): Forward declaration. (elf_i386_get_plt_sym_val): Removed. (elf_i386_get_synthetic_symtab): Rewrite to check PLT sections against all dynamic relocations. (elf_i386_link_setup_gnu_properties): New function. (elf_backend_create_dynamic_sections): Updated. (elf_backend_setup_gnu_properties): New. (elf_i386_nacl_plt): Updated. (elf_i386_nacl_arch_bed): Likewise. (elf_i386_vxworks_arch_bed): Likewise. ld/ * testsuite/ld-i386/i386.exp: Add some -z now tests. * testsuite/ld-i386/plt-pic2.dd: New file. * testsuite/ld-i386/plt2.dd: Likewise. * testsuite/ld-i386/plt2.rd: Likewise. * testsuite/ld-i386/plt2.s: Likewise. * testsuite/ld-ifunc/ifunc-16-i386-now.d: Likewise. * testsuite/ld-ifunc/ifunc-2-i386-now.d: Likewise. * testsuite/ld-ifunc/ifunc-2-local-i386-now.d: Likewise. * testsuite/ld-ifunc/pr17154-i386-now.d: Likewise. * testsuite/ld-i386/pr20830.d: Update the .plt.got section with func@plt.
2017-05-09 01:10:22 +08:00
#pass