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37c18eedff
This is part of the patch series to add support for BTI and PAC in AArch64 linker. 1) This patch adds a new ld command line option: --force-bti. In the presence of this option, the linker enables BTI with the GNU_PROPERTY_AARCH64_FEATURE_1_BTI feature. This gives out warning in case of missing gnu notes for BTI in inputs. 2) It also defines a new set of BTI enabled PLTs. These are used either when all the inputs are marked with GNU_PROPERTY_AARCH64_FEATURE_1_BTI or when the new --force-bti option is used. This required adding new fields in elf_aarch64_link_hash_table so that we could make the PLT related information more generic. 3) It also defines a dynamic tag DT_AARCH64_BTI_PLT. The linker uses this whenever it picks BTI enabled PLTs. All these are made according to the new AArch64 ELF ABI https://developer.arm.com/docs/ihi0056/latest/elf-for-the-arm-64-bit-architecture-aarch64-abi-2018q4 *** bfd/ChangeLog *** 2019-03-13 Sudakshina Das <sudi.das@arm.com> Szabolcs Nagy <szabolcs.nagy@arm.com> * bfd-in.h (aarch64_plt_type, aarch64_enable_bti_type): New. (aarch64_bti_pac_info): New. (bfd_elf64_aarch64_set_options): Add aarch64_bti_pac_info argument. (bfd_elf32_aarch64_set_options): Likewise. * bfd-in2.h: Regenerate * elfnn-aarch64.c (PLT_BTI_ENTRY_SIZE): New. (PLT_BTI_SMALL_ENTRY_SIZE, PLT_BTI_TLSDESC_ENTRY_SIZE): New. (elfNN_aarch64_small_plt0_bti_entry): New. (elfNN_aarch64_small_plt_bti_entry): New. (elfNN_aarch64_tlsdesc_small_plt_bti_entry): New. (elf_aarch64_obj_tdata): Add no_bti_warn and plt_type fields. (elf_aarch64_link_hash_table): Add plt0_entry, plt_entry and tlsdesc_plt_entry_size fields. (elfNN_aarch64_link_hash_table_create): Initialise the new fields. (setup_plt_values): New helper function. (bfd_elfNN_aarch64_set_options): Use new bp_info to set plt sizes and bti enable type. (elfNN_aarch64_allocate_dynrelocs): Use new size members instead of fixed macros. (elfNN_aarch64_size_dynamic_sections): Likewise and add checks. (elfNN_aarch64_create_small_pltn_entry): Use new generic pointers to plt stubs instead of fixed ones and update filling them according to the need for bti. (elfNN_aarch64_init_small_plt0_entry): Likewise. (elfNN_aarch64_finish_dynamic_sections): Likewise. (get_plt_type, elfNN_aarch64_get_synthetic_symtab): New. (elfNN_aarch64_plt_sym_val): Update size accordingly. (elfNN_aarch64_link_setup_gnu_properties): Set up plts if BTI GNU NOTE is set. (bfd_elfNN_get_synthetic_symtab): Define. (elfNN_aarch64_merge_gnu_properties): Give out warning with --force-bti and mising BTI NOTE SECTION. *** binutils/ChangeLog *** 2019-03-13 Sudakshina Das <sudi.das@arm.com> Szabolcs Nagy <szabolcs.nagy@arm.com> * readelf.c (get_aarch64_dynamic_type): New. (get_dynamic_type): Use above for EM_AARCH64. (dynamic_section_aarch64_val): New. (process_dynamic_section): Use above for EM_AARCH64. *** include/ChangeLog *** 2019-03-13 Sudakshina Das <sudi.das@arm.com> Szabolcs Nagy <szabolcs.nagy@arm.com> * elf/aarch64.h (DT_AARCH64_BTI_PLT): New. *** ld/ChangeLog *** 2019-03-13 Sudakshina Das <sudi.das@arm.com> Szabolcs Nagy <szabolcs.nagy@arm.com> * NEWS: Document --force-bti. * emultempl/aarch64elf.em (plt_type, bti_type, OPTION_FORCE_BTI): New. (PARSE_AND_LIST_SHORTOPTS, PARSE_AND_LIST_OPTIONS): Add force-bti. (PARSE_AND_LIST_ARGS_CASES): Handle OPTION_FORCE_BTI. * testsuite/ld-aarch64/aarch64-elf.exp: Add all the tests below. * testsuite/ld-aarch64/bti-plt-1.d: New test. * testsuite/ld-aarch64/bti-plt-1.s: New test. * testsuite/ld-aarch64/bti-plt-2.s: New test. * testsuite/ld-aarch64/bti-plt-2.d: New test. * testsuite/ld-aarch64/bti-plt-3.d: New test. * testsuite/ld-aarch64/bti-plt-4.d: New test. * testsuite/ld-aarch64/bti-plt-5.d: New test. * testsuite/ld-aarch64/bti-plt-6.d: New test. * testsuite/ld-aarch64/bti-plt-7.d: New test. * testsuite/ld-aarch64/bti-plt-so.s: New test. * testsuite/ld-aarch64/bti-plt.ld: New test.
15 lines
323 B
Plaintext
15 lines
323 B
Plaintext
OUTPUT_ARCH(aarch64)
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ENTRY(_start)
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SECTIONS
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{
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. = 0x10000;
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.rela.plt : { *(.rela.plt) *(.rela.iplt) }
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. = 0x18000;
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.plt : { *(.plt) *(.iplt) }
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. = 0x20000;
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.text : { *(.text) }
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. = 0x28000;
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.got : { *(.got) *(.got.plt) }
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.ARM.attributes 0 : { *(.ARM.atttributes) }
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}
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