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These are useless because they can't match any address. In fact,
worse than useless because the .eh_frame_hdr lookup table matching
addresses to FDEs does not contain information about the FDE range.
The table is sorted by address; Range is inferred by the address
delta from one entry to the next. So if a zero address range FDE is
followed by a normal non-zero range FDE for the same address,
everything is good. However, the qsort could just as easily sort the
FDEs in the other order, in which case the normal FDE would
effectively be seen to have a zero range.
bfd/
PR 17447
* elf-bfd.h (struct eh_cie_fde): Comment re NULL u.fde.cie_inf.
* elf-eh-frame.c (_bfd_elf_parse_eh_frame): Mark zero address
range FDEs for discarding.
(vma_compare): Sort on range after address.
(_bfd_elf_gc_mark_fdes): Test for NULL u.fde.cie_inf.
(_bfd_elf_discard_section_eh_frame): Likewise. Write "FDE" in
error message rather than "fde".
(_bfd_elf_write_section_eh_frame_hdr): Write "PC" and "FDE" in
error message.
ld/testsuite/
* ld-elf/eh1.s: Don't create FDEs with zero address ranges.
* ld-elf/eh3.s: Likewise.
* ld-elf/eh1.d, * ld-elf/eh2.d, * ld-elf/eh3.d: Adjust.
* ld-mips-elf/eh-frame1-n32.d: Warning match update.
* ld-mips-elf/eh-frame1-n64.d: Likewise.
* ld-mips-elf/eh-frame2-n32.d: Likewise.
* ld-mips-elf/eh-frame2-n64.d: Likewise.
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* gas/mips/mips.exp: Set has_newabi for all Linux targets.
* gas/mips/cfi-n64-1.d: Adjust for targets that do not infer the
ISA from the ABI.
* gas/mips/elf-rel-got-n32.d: Likewise.
* gas/mips/elf-rel-got-n64.d: Likewise.
* gas/mips/elf-rel-xgot-n32.d: Likewise.
* gas/mips/elf-rel-xgot-n64.d: Likewise.
* gas/mips/elf-rel18.d: Likewise.
* gas/mips/elf-rel28-n32.d: Likewise.
* gas/mips/elf-rel28-n64.d: Likewise.
* gas/mips/jal-newabi.d: Likewise.
* gas/mips/ldstla-n64-shared.d: Likewise.
* gas/mips/ldstla-n64-sym32.d: Likewise.
* gas/mips/ldstla-n64.d: Likewise.
* gas/mips/macro-warn-1-n32.d: Likewise.
* gas/mips/macro-warn-2-n32.d: Likewise.
* gas/mips/n32-consec.d: Likewise.
ld/testsuite/
* ld-mips-elf/mips-elf.exp: Set has_newabi for all Linux targets.
Adjust abi_asflags for targets that do not infer the ISA from the
ABI.
* ld-mips-elf/eh-frame1-n32.d: Adjust for targets that do not
infer the ISA from the ABI.
* ld-mips-elf/eh-frame1-n64.d: Likewise.
* ld-mips-elf/eh-frame2-n32.d: Likewise.
* ld-mips-elf/eh-frame2-n64.d: Likewise.
* ld-mips-elf/elf-rel-got-n32-embed.d: Likewise.
* ld-mips-elf/elf-rel-got-n32.d: Likewise.
* ld-mips-elf/elf-rel-got-n64-embed.d: Likewise.
* ld-mips-elf/elf-rel-got-n64-linux.d: Likewise.
* ld-mips-elf/elf-rel-got-n64.d: Likewise.
* ld-mips-elf/elf-rel-xgot-n32-embed.d: Likewise.
* ld-mips-elf/elf-rel-xgot-n32.d: Likewise.
* ld-mips-elf/elf-rel-xgot-n64-embed.d: Likewise.
* ld-mips-elf/elf-rel-xgot-n64-linux.d: Likewise.
* ld-mips-elf/elf-rel-xgot-n64.d: Likewise.
* ld-mips-elf/emit-relocs-1.d: Likewise.
* ld-mips-elf/got-page-2.d: Likewise.
* ld-mips-elf/no-shared-1-n32.d: Likewise.
* ld-mips-elf/no-shared-1-n64.d: Likewise.
* ld-mips-elf/rel32-n32.d: Likewise.
* ld-mips-elf/rel64.d: Likewise.
* ld-mips-elf/relax-jalr-n32-shared.d: Likewise.
* ld-mips-elf/relax-jalr-n32.d: Likewise.
* ld-mips-elf/relax-jalr-n64-shared.d: Likewise.
* ld-mips-elf/relax-jalr-n64.d: Likewise.
* ld-mips-elf/reloc-1-n32.d: Likewise.
* ld-mips-elf/reloc-1-n64.d: Likewise.
* ld-mips-elf/textrel-1.d: Likewise.
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* elf-eh-frame.c (make_pc_relative): New function.
(_bfd_elf_write_section_eh_frame): Use it.
ld/testsuite/
* ld-mips-elf/eh-frame1-n32.d: Expect PC-relative encodings
to include DW_EH_PE_sdata4.
* ld-mips-elf/eh-frame2-n32.d: Likewise.
* ld-mips-elf/eh-frame1-n64.d: Expect PC-relative encodings
to include DW_EH_PE_sdata8.
* ld-mips-elf/eh-frame2-n64.d: Likewise.
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* gas/mips/mips16-dwarf2-n32.d: Expect odd addresses.
ld/testsuite/
* ld-mips-elf/eh-frame1-n32.d: Change "the section \.eh_frame"
to "the \.eh_frame section".
* ld-mips-elf/eh-frame1-n64.d: Likewise.
* ld-mips-elf/eh-frame2-n32.d: Likewise.
* ld-mips-elf/eh-frame2-n64.d: Likewise.
* ld-mips-elf/eh-frame3.d: Likewise.
* ld-mips-elf/eh-frame4.d: Likewise.
* ld-mips-elf/elf-rel-got-n32.d: Expect bals.
* ld-mips-elf/elf-rel-xgot-n32.d: Likewise.
* ld-mips-elf/mips-elf.exp: Force the MIPS16 PIC tests to use -mips1.
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(process_debug_info): Likewise.
(display_debug_aranges): Likewise. Indent address output.
(display_debug_pubnames): Print offset in hex.
* binutils-all/objdump.W: Update.
* gas/cfi/cfi-alpha-1.d, gas/cfi/cfi-alpha-3.d,
gas/cfi/cfi-arm-1.d, gas/cfi/cfi-common-1.d,
gas/cfi/cfi-common-2.d, gas/cfi/cfi-common-3.d,
gas/cfi/cfi-common-4.d, gas/cfi/cfi-common-5.d,
gas/cfi/cfi-common-6.d, gas/cfi/cfi-hppa-1.d,
gas/cfi/cfi-i386-2.d, gas/cfi/cfi-i386.d, gas/cfi/cfi-m68k.d,
gas/cfi/cfi-mips-1.d, gas/cfi/cfi-ppc-1.d, gas/cfi/cfi-s390-1.d,
gas/cfi/cfi-s390x-1.d, gas/cfi/cfi-sh-1.d, gas/cfi/cfi-sparc-1.d,
gas/cfi/cfi-sparc64-1.d, gas/cfi/cfi-x86_64.d: Update for readelf
change.
* ld-elf/eh1.d, ld-elf/eh2.d, ld-elf/eh3.d, ld-elf/eh4.d,
ld-elf/eh5.d, ld-elf/eh6.d, ld-mips-elf/eh-frame1-n32.d,
ld-mips-elf/eh-frame1-n64.d, ld-mips-elf/eh-frame2-n32.d,
ld-mips-elf/eh-frame2-n64.d, ld-mips-elf/eh-frame3.d,
ld-mips-elf/eh-frame4.d: Update for readelf change.
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* ld-mips-elf/eh-frame1-n32.d: Expect a warning about .eh_frame_hdr.
Remove duplicate CIEs. Adjust relocation addresses and .eh_frame
offsets accordingly. Do not allow there to be any trailing
R_MIPS_NONE relocations.
* ld-mips-elf/eh-frame1-n64.d: Likewise.
* ld-mips-elf/eh-frame2-n32.d: Likewise.
* ld-mips-elf/eh-frame2-n64.d: Likewise.
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* elf-bfd.h (struct elf_link_hash_table): Reorder. Add
text_index_section and data_index_section.
(struct elf_backend_data): Add elf_backend_init_index_section.
(_bfd_elf_init_1_index_section): Declare.
(_bfd_elf_init_2_index_sections): Declare.
* elfxx-target.h (elf_backend_init_index_section): Define.
(elfNN_bed): Init new field.
* elflink.c (_bfd_elf_link_omit_section_dynsym): Keep first tls
section and text_index_section plus data_index_section.
(_bfd_elf_link_renumber_dynsyms): Clear dynindx on omitted sections.
(_bfd_elf_init_1_index_section): New function.
(_bfd_elf_init_2_index_sections): New function.
(bfd_elf_size_dynsym_hash_dynstr): Call elf_backend_init_index_section.
(elf_link_input_bfd): When emitting relocs, use text_index_section
and data_index_section for removed sections.
* elf-m10300.c (elf_backend_omit_section_dynsym): Define.
* elf32-i386.c: Likewise.
* elf32-m32r.c: Likewise.
* elf32-sh.c: Likewise.
* elf32-xstormy16.c: Likewise.
* elf32-xtensa.c: Likewise.
* elf64-alpha.c: Likewise.
* elf64-hppa.c: Likewise.
* elf64-mmix.c: Likewise.
* elf64-sh64.c: Likewise.
* elfxx-ia64.c: Likewise.
* elf32-arm.c (elf32_arm_final_link_relocate): Use text_index_section
and data_index_section sym for relocs against sections with no dynamic
section sym.
(elf_backend_init_index_section): Define.
* elf32-cris.c: Similarly.
* elf32-hppa.c: Similarly.
* elf32-i370.c: Similarly.
* elf32-m68k.c: Similarly.
* elf32-mips.c: Similarly.
* elf32-ppc.c: Similarly.
* elf32-s390.c: Similarly.
* elf32-sparc.c: Similarly.
* elf32-vax.c: Similarly.
* elf64-mips.c: Similarly.
* elf64-ppc.c: Similarly.
* elf64-s390.c: Similarly.
* elf64-sparc.c: Similarly.
* elf64-x86-64.c: Similarly.
* elfn32-mips.c: Similarly.
* elfxx-mips.c: Similarly.
* elfxx-sparc.c: Similarly.
* linker.c (fix_syms): Base symbols in removed sections on
previous section in preference to using absolute section.
ld/
* ldlang.c (strip_excluded_output_sections): Do strip sections
that define syms, but don't ignore them.
* ld.texinfo (Output Section Discarding): Revise.
* emultempl/armcoff.em (gld${EMULATION_NAME}_finish): Always call
finish_default.
ld/testsuite/
Update for section sym changes.
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(_bfd_elf_discard_section_eh_frame): Use them to interpret the CFA
instructions. If the amount of padding is known, reduce the size
of the CIE or FDE by that amount.
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