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2d7ad24e87
Necessary if gcc is to use PLT16 relocs to implement -mlongcall, and there isn't a good technical reason why local symbols should be excluded from PLT16 support. Non-ifunc local symbol PLT entries go in a separate section to other PLT entries. In a fixed position executable they won't need to be relocated, and in a PIE or shared library I chose to not implement lazy relocation. bfd/ * elf64-ppc.c (LOCAL_PLT_ENTRY_SIZE): Define. (struct ppc_stub_hash_entry): Add symtype field. (PLT_KEEP): Define. (struct ppc_link_hash_table): Add pltlocal and relpltlocal. (create_linkage_sections): Create pltlocal and relpltlocal. (ppc64_elf_check_relocs): Allow PLT relocs on local symbols. Set PLT_KEEP. (ppc64_elf_adjust_dynamic_symbol): Keep PLT entries for inline calls. (allocate_dynrelocs): Allocate pltlocal and relpltlocal. (ppc64_elf_size_dynamic_sections): Size pltlocal and relpltlocal. Keep PLT entries for inline calls against locals. (ppc_build_one_stub): Use pltlocal as appropriate. (ppc_size_one_stub): Likewise. (ppc64_elf_size_stubs): Set symtype. (build_global_entry_stubs_and_plt): Init pltlocal and write relpltlocal for globals. (write_plt_relocs_for_local_syms): Likewise for local syms. (ppc64_elf_relocate_section): Support PLT for local syms. * elf32-ppc.c (PLT_KEEP): Define. (struct ppc_elf_link_hash_table): Add pltlocal and relpltlocal. (ppc_elf_create_glink): Create pltlocal and relpltlocal. (ppc_elf_check_relocs): Allow PLT relocs on local symbols. Set PLT_KEEP. Adjust update_local_sym_info call. (ppc_elf_adjust_dynamic_symbol): Keep PLT entries for inline calls. (allocate_dynrelocs): Allocate pltlocal and relpltlocal. (ppc_elf_size_dynamic_sections): Size pltlocal and relpltlocal. (ppc_elf_relocate_section): Support PLT16 relocs for local syms. (write_global_sym_plt): Init pltlocal and write relpltlocal. (ppc_finish_symbols): Likewise for locals. ld/ * emulparams/elf32ppc.sh (OTHER_RELRO_SECTIONS_2): Add .branch_lt. (OTHER_GOT_RELOC_SECTIONS): Add .rela.branch_lt. * testsuite/ld-powerpc/elfv2so.d: Update for symbol/stub reordering. * testsuite/ld-powerpc/relbrlt.d: Likewise. * testsuite/ld-powerpc/relbrlt.s: Likewise. * testsuite/ld-powerpc/tlsso.r: Likewise. * testsuite/ld-powerpc/tlstocso.r: Likewise. gold/ * powerpc.cc (Target_powerpc::lplt_): New variable. (Target_powerpc::lplt_section): Associated accessor. (Target_powerpc::plt_off): Handle local non-ifunc symbols. (Target_powerpc::make_lplt_section): New function. (Target_powerpc::make_local_plt_entry): New function. (Powerpc_relobj::do_relocate_sections): Write out lplt. (Output_data_plt_powerpc::first_plt_entry_offset): Zero for lplt. (Output_data_plt_powerpc::add_local_entry): New function. (Output_data_plt_powerpc::do_write): Ignore lplt. (Target_powerpc::make_iplt_section): Make lplt first. (Target_powerpc::make_brlt_section): Make .branch_lt relro. (Target_powerpc::Scan::local): Handle PLT16 relocs.
61 lines
1.8 KiB
Makefile
61 lines
1.8 KiB
Makefile
#source: relbrlt.s
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#as: -a64
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#ld: -melf64ppc --no-plt-align --no-ld-generated-unwind-info --emit-relocs
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#objdump: -Dr
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.*
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Disassembly of section \.text:
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0*100000c0 <_start>:
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[0-9a-f ]*: (49 bf 00 2d|2d 00 bf 49) bl .*
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[0-9a-f ]*: R_PPC64_REL24 \.text\+0x37e003c
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[0-9a-f ]*: (60 00 00 00|00 00 00 60) nop
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[0-9a-f ]*: (49 bf 00 19|19 00 bf 49) bl .*
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[0-9a-f ]*: R_PPC64_REL24 \.text\+0x3bf0020
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[0-9a-f ]*: (60 00 00 00|00 00 00 60) nop
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[0-9a-f ]*: (49 bf 00 21|21 00 bf 49) bl .*
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[0-9a-f ]*: R_PPC64_REL24 \.text\+0x57e0024
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[0-9a-f ]*: (60 00 00 00|00 00 00 60) nop
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[0-9a-f ]*: 00 00 00 00 \.long 0x0
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[0-9a-f ]*: (4b ff ff e4|e4 ff ff 4b) b .* <_start>
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\.\.\.
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[0-9a-f ]*<.*plt_branch.*>:
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[0-9a-f ]*: (e9 82 80 e8|e8 80 82 e9) ld r12,-32536\(r2\)
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[0-9a-f ]*: R_PPC64_TOC16_DS \*ABS\*\+0x157f00e8
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[0-9a-f ]*: (7d 89 03 a6|a6 03 89 7d) mtctr r12
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[0-9a-f ]*: (4e 80 04 20|20 04 80 4e) bctr
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[0-9a-f ]*<.*long_branch.*>:
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[0-9a-f ]*: (49 bf 00 10|10 00 bf 49) b .* <far>
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[0-9a-f ]*: R_PPC64_REL24 \*ABS\*\+0x137e00fc
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[0-9a-f ]*<.*plt_branch.*>:
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[0-9a-f ]*: (e9 82 80 f0|f0 80 82 e9) ld r12,-32528\(r2\)
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[0-9a-f ]*: R_PPC64_TOC16_DS \*ABS\*\+0x157f00f0
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[0-9a-f ]*: (7d 89 03 a6|a6 03 89 7d) mtctr r12
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[0-9a-f ]*: (4e 80 04 20|20 04 80 4e) bctr
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\.\.\.
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0*137e00fc <far>:
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[0-9a-f ]*: (4e 80 00 20|20 00 80 4e) blr
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\.\.\.
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0*13bf00e0 <far2far>:
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[0-9a-f ]*: (4e 80 00 20|20 00 80 4e) blr
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\.\.\.
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0*157e00e4 <huge>:
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[0-9a-f ]*: (4e 80 00 20|20 00 80 4e) blr
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Disassembly of section \.branch_lt:
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0*157f00e8 .*:
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[0-9a-f ]*: (00 00 00 00|e0 00 bf 13) .*
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[0-9a-f ]*: R_PPC64_RELATIVE \*ABS\*\+0x13bf00e0
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[0-9a-f ]*: (13 bf 00 e0|00 00 00 00) .*
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[0-9a-f ]*: (00 00 00 00|e4 00 7e 15) .*
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[0-9a-f ]*: R_PPC64_RELATIVE \*ABS\*\+0x157e00e4
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[0-9a-f ]*: (15 7e 00 e4|00 00 00 00) .*
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