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b75ce33f0c
This patch adds support for Guarded Control Stack in AArch64 linker.
This patch implements the following:
1) Defines GNU_PROPERTY_AARCH64_FEATURE_1_GCS bit for GCS in
GNU_PROPERTY_AARCH64_FEATURE_1_AND macro.
2) Adds readelf support to read and print the GCS feature in GNU
properties in AArch64.
Displaying notes found in: .note.gnu.property
[ ]+Owner[ ]+Data size[ ]+Description
GNU 0x00000010 NT_GNU_PROPERTY_TYPE_0
Properties: AArch64 feature: GCS
3) Adds support for the "-z gcs" linker option and document all the values
allowed with this option (-z gcs[=always|never|implicit]) where "-z gcs" is
equivalent to "-z gcs=always". When '-z gcs' option is omitted from the
command line, it defaults to "implicit" and relies on the GCS feature
marking in GNU properties.
4) Adds support for the "-z gcs-report" linker option and document all the
values allowed with this option (-z gcs-report[=none|warning|error]) where
"-z gcs-report" is equivalent to "-z gcs-report=warning". When this option
is omitted from the command line, it defaults to "warning".
The ABI changes adding GNU_PROPERTY_AARCH64_FEATURE_1_GCS to the GNU
property GNU_PROPERTY_AARCH64_FEATURE_1_AND is merged into main and
can be found in [1].
[1] https://github.com/ARM-software/abi-aa/blob/main/sysvabi64/sysvabi64.rst
Co-authored-by: Matthieu Longo <matthieu.longo@arm.com>
Co-authored-by: Yury Khrustalev <yury.khrustalev@arm.com>
230 lines
7.7 KiB
C
230 lines
7.7 KiB
C
/* AArch64-specific backend routines.
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Copyright (C) 2009-2024 Free Software Foundation, Inc.
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Contributed by ARM Ltd.
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This file is part of BFD, the Binary File Descriptor library.
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This program is free software; you can redistribute it and/or modify
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it under the terms of the GNU General Public License as published by
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the Free Software Foundation; either version 3 of the License, or
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(at your option) any later version.
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This program is distributed in the hope that it will be useful,
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but WITHOUT ANY WARRANTY; without even the implied warranty of
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MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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GNU General Public License for more details.
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You should have received a copy of the GNU General Public License
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along with this program; see the file COPYING3. If not,
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see <http://www.gnu.org/licenses/>. */
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extern void bfd_elf64_aarch64_init_maps
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(bfd *);
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extern void bfd_elf32_aarch64_init_maps
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(bfd *);
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/* Types of PLTs based on the level of security. This would be a
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bit-mask to denote which of the combinations of security features
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are enabled:
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- No security feature PLTs
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- PLTs with BTI instruction
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- PLTs with PAC instruction
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*/
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typedef enum
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{
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PLT_NORMAL = 0x0, /* Normal plts. */
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PLT_BTI = 0x1, /* plts with BTI. */
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PLT_PAC = 0x2, /* plts with pointer authentication. */
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PLT_BTI_PAC = PLT_BTI | PLT_PAC
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} aarch64_plt_type;
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/* Indicates whether the linker should generate warnings, errors, or nothing
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when input objects are missing GNU feature property markings and the output
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has the markings. */
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typedef enum
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{
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MARKING_NONE = 0, /* Does not emit any warning/error messages. */
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MARKING_WARN = 1, /* Emit warning when the input objects are missing GNU
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feature property markings, and the output has the
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markings. */
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MARKING_ERROR = 2, /* Emit error when the input objects are missing GNU
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feature property markings, and the output has the
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markings. */
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} aarch64_feature_marking_report;
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/* To indicate whether GNU_PROPERTY_AARCH64_FEATURE_1_GCS bit is
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enabled/disabled on the output when -z gcs linker
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command line option is passed. */
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typedef enum
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{
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GCS_NEVER = 0, /* gcs is disabled on output. */
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GCS_IMPLICIT = 1, /* gcs is deduced from input object. */
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GCS_ALWAYS = 2, /* gsc is enabled on output. */
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} aarch64_gcs_type;
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/* A structure to encompass all information about software protections coming
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from BTI or PAC related command line options. */
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struct aarch64_protection_opts
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{
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/* PLT type to use depending on the selected software proctections. */
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aarch64_plt_type plt_type;
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/* Report level for BTI issues. */
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aarch64_feature_marking_report bti_report;
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/* Look-up mode for GCS property. */
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aarch64_gcs_type gcs_type;
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/* Report level for GCS issues. */
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aarch64_feature_marking_report gcs_report;
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};
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typedef struct aarch64_protection_opts aarch64_protection_opts;
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struct elf_aarch64_local_symbol;
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struct elf_aarch64_obj_tdata
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{
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struct elf_obj_tdata root;
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/* local symbol descriptors */
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struct elf_aarch64_local_symbol *locals;
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/* Zero to warn when linking objects with incompatible enum sizes. */
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int no_enum_size_warning;
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/* Zero to warn when linking objects with incompatible wchar_t sizes. */
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int no_wchar_size_warning;
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/* All GNU_PROPERTY_AARCH64_FEATURE_1_AND properties. */
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uint32_t gnu_property_aarch64_feature_1_and;
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/* Software protections options. */
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struct aarch64_protection_opts sw_protections;
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/* Number of reported BTI issues. */
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int n_bti_issues;
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/* Number of reported GCS issues. */
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int n_gcs_issues;
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};
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#define elf_aarch64_tdata(bfd) \
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((struct elf_aarch64_obj_tdata *) (bfd)->tdata.any)
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/* An enum to define what kind of erratum fixes we should apply. This gives the
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user a bit more control over the sequences we generate. */
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typedef enum
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{
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ERRAT_NONE = (1 << 0), /* No erratum workarounds allowed. */
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ERRAT_ADR = (1 << 1), /* Erratum workarounds using ADR allowed. */
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ERRAT_ADRP = (1 << 2), /* Erratum workarounds using ADRP are allowed. */
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} erratum_84319_opts;
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extern void bfd_elf64_aarch64_set_options
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(bfd *, struct bfd_link_info *, int, int, int, int, erratum_84319_opts, int,
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const aarch64_protection_opts *);
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extern void bfd_elf32_aarch64_set_options
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(bfd *, struct bfd_link_info *, int, int, int, int, erratum_84319_opts, int,
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const aarch64_protection_opts *);
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/* AArch64 stub generation support for ELF64. Called from the linker. */
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extern int elf64_aarch64_setup_section_lists
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(bfd *, struct bfd_link_info *);
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extern void elf64_aarch64_next_input_section
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(struct bfd_link_info *, struct bfd_section *);
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extern bool elf64_aarch64_size_stubs
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(bfd *, bfd *, struct bfd_link_info *, bfd_signed_vma,
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struct bfd_section * (*) (const char *, struct bfd_section *),
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void (*) (void));
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extern bool elf64_aarch64_build_stubs
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(struct bfd_link_info *);
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/* AArch64 stub generation support for ELF32. Called from the linker. */
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extern int elf32_aarch64_setup_section_lists
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(bfd *, struct bfd_link_info *);
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extern void elf32_aarch64_next_input_section
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(struct bfd_link_info *, struct bfd_section *);
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extern bool elf32_aarch64_size_stubs
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(bfd *, bfd *, struct bfd_link_info *, bfd_signed_vma,
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struct bfd_section * (*) (const char *, struct bfd_section *),
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void (*) (void));
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extern bool elf32_aarch64_build_stubs
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(struct bfd_link_info *);
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/* AArch64 relative relocation packing support for ELF64. */
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extern bool elf64_aarch64_size_relative_relocs
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(struct bfd_link_info *, bool *);
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extern bool elf64_aarch64_finish_relative_relocs
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(struct bfd_link_info *);
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/* AArch64 relative relocation packing support for ELF32. */
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extern bool elf32_aarch64_size_relative_relocs
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(struct bfd_link_info *, bool *);
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extern bool elf32_aarch64_finish_relative_relocs
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(struct bfd_link_info *);
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/* Take the PAGE component of an address or offset. */
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#define PG(x) ((x) & ~ (bfd_vma) 0xfff)
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#define PG_OFFSET(x) ((x) & (bfd_vma) 0xfff)
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#define AARCH64_ADR_OP 0x10000000
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#define AARCH64_ADRP_OP 0x90000000
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#define AARCH64_ADRP_OP_MASK 0x9F000000
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extern bfd_signed_vma
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_bfd_aarch64_sign_extend (bfd_vma, int);
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extern uint32_t
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_bfd_aarch64_decode_adrp_imm (uint32_t);
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extern uint32_t
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_bfd_aarch64_reencode_adr_imm (uint32_t, uint32_t);
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extern bfd_reloc_status_type
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_bfd_aarch64_elf_put_addend (bfd *, bfd_byte *, bfd_reloc_code_real_type,
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reloc_howto_type *, bfd_signed_vma);
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extern bfd_vma
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_bfd_aarch64_elf_resolve_relocation (bfd *, bfd_reloc_code_real_type, bfd_vma,
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bfd_vma, bfd_vma, bool);
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extern bool
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_bfd_aarch64_elf_grok_prstatus (bfd *, Elf_Internal_Note *);
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extern bool
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_bfd_aarch64_elf_grok_psinfo (bfd *, Elf_Internal_Note *);
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extern char *
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_bfd_aarch64_elf_write_core_note (bfd *, char *, int *, int, ...);
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#define elf_backend_grok_prstatus _bfd_aarch64_elf_grok_prstatus
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#define elf_backend_grok_psinfo _bfd_aarch64_elf_grok_psinfo
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#define elf_backend_write_core_note _bfd_aarch64_elf_write_core_note
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extern bfd *
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_bfd_aarch64_elf_link_setup_gnu_properties (struct bfd_link_info *);
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extern enum elf_property_kind
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_bfd_aarch64_elf_parse_gnu_properties (bfd *, unsigned int,
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bfd_byte *, unsigned int);
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extern bool
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_bfd_aarch64_elf_merge_gnu_properties (struct bfd_link_info *, bfd *,
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elf_property *, elf_property *,
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uint32_t);
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extern void
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_bfd_aarch64_elf_check_bti_report (struct bfd_link_info *, bfd *);
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extern void
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_bfd_aarch64_elf_check_gcs_report (struct bfd_link_info *, bfd *);
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extern void
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_bfd_aarch64_elf_link_fixup_gnu_properties (struct bfd_link_info *,
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elf_property_list **);
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#define elf_backend_parse_gnu_properties \
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_bfd_aarch64_elf_parse_gnu_properties
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#define elf_backend_fixup_gnu_properties \
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_bfd_aarch64_elf_link_fixup_gnu_properties
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