| 1 | /* AArch64-specific backend routines. |
| 2 | Copyright (C) 2009-2020 Free Software Foundation, Inc. |
| 3 | Contributed by ARM Ltd. |
| 4 | |
| 5 | This file is part of BFD, the Binary File Descriptor library. |
| 6 | |
| 7 | This program is free software; you can redistribute it and/or modify |
| 8 | it under the terms of the GNU General Public License as published by |
| 9 | the Free Software Foundation; either version 3 of the License, or |
| 10 | (at your option) any later version. |
| 11 | |
| 12 | This program is distributed in the hope that it will be useful, |
| 13 | but WITHOUT ANY WARRANTY; without even the implied warranty of |
| 14 | MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the |
| 15 | GNU General Public License for more details. |
| 16 | |
| 17 | You should have received a copy of the GNU General Public License |
| 18 | along with this program; see the file COPYING3. If not, |
| 19 | see <http://www.gnu.org/licenses/>. */ |
| 20 | |
| 21 | extern void bfd_elf64_aarch64_init_maps |
| 22 | (bfd *); |
| 23 | |
| 24 | extern void bfd_elf32_aarch64_init_maps |
| 25 | (bfd *); |
| 26 | |
| 27 | /* Types of PLTs based on the level of security. This would be a |
| 28 | bit-mask to denote which of the combinations of security features |
| 29 | are enabled: |
| 30 | - No security feature PLTs |
| 31 | - PLTs with BTI instruction |
| 32 | - PLTs with PAC instruction |
| 33 | */ |
| 34 | typedef enum |
| 35 | { |
| 36 | PLT_NORMAL = 0x0, /* Normal plts. */ |
| 37 | PLT_BTI = 0x1, /* plts with bti. */ |
| 38 | PLT_PAC = 0x2, /* plts with pointer authentication. */ |
| 39 | PLT_BTI_PAC = PLT_BTI | PLT_PAC |
| 40 | } aarch64_plt_type; |
| 41 | |
| 42 | /* To indicate if BTI is enabled with/without warning. */ |
| 43 | typedef enum |
| 44 | { |
| 45 | BTI_NONE = 0, /* BTI is not enabled. */ |
| 46 | BTI_WARN = 1, /* BTI is enabled with -z force-bti. */ |
| 47 | } aarch64_enable_bti_type; |
| 48 | |
| 49 | /* A structure to encompass all information coming from BTI or PAC |
| 50 | related command line options. This involves the "PLT_TYPE" to determine |
| 51 | which version of PLTs to pick and "BTI_TYPE" to determine if |
| 52 | BTI should be turned on with any warnings. */ |
| 53 | typedef struct |
| 54 | { |
| 55 | aarch64_plt_type plt_type; |
| 56 | aarch64_enable_bti_type bti_type; |
| 57 | } aarch64_bti_pac_info; |
| 58 | |
| 59 | /* An enum to define what kind of erratum fixes we should apply. This gives the |
| 60 | user a bit more control over the sequences we generate. */ |
| 61 | typedef enum |
| 62 | { |
| 63 | ERRAT_NONE = (1 << 0), /* No erratum workarounds allowed. */ |
| 64 | ERRAT_ADR = (1 << 1), /* Erratum workarounds using ADR allowed. */ |
| 65 | ERRAT_ADRP = (1 << 2), /* Erratum workarounds using ADRP are allowed. */ |
| 66 | } erratum_84319_opts; |
| 67 | |
| 68 | extern void bfd_elf64_aarch64_set_options |
| 69 | (bfd *, struct bfd_link_info *, int, int, int, int, erratum_84319_opts, int, |
| 70 | aarch64_bti_pac_info); |
| 71 | |
| 72 | extern void bfd_elf32_aarch64_set_options |
| 73 | (bfd *, struct bfd_link_info *, int, int, int, int, erratum_84319_opts, int, |
| 74 | aarch64_bti_pac_info); |
| 75 | |
| 76 | /* AArch64 stub generation support for ELF64. Called from the linker. */ |
| 77 | extern int elf64_aarch64_setup_section_lists |
| 78 | (bfd *, struct bfd_link_info *); |
| 79 | extern void elf64_aarch64_next_input_section |
| 80 | (struct bfd_link_info *, struct bfd_section *); |
| 81 | extern bfd_boolean elf64_aarch64_size_stubs |
| 82 | (bfd *, bfd *, struct bfd_link_info *, bfd_signed_vma, |
| 83 | struct bfd_section * (*) (const char *, struct bfd_section *), |
| 84 | void (*) (void)); |
| 85 | extern bfd_boolean elf64_aarch64_build_stubs |
| 86 | (struct bfd_link_info *); |
| 87 | /* AArch64 stub generation support for ELF32. Called from the linker. */ |
| 88 | extern int elf32_aarch64_setup_section_lists |
| 89 | (bfd *, struct bfd_link_info *); |
| 90 | extern void elf32_aarch64_next_input_section |
| 91 | (struct bfd_link_info *, struct bfd_section *); |
| 92 | extern bfd_boolean elf32_aarch64_size_stubs |
| 93 | (bfd *, bfd *, struct bfd_link_info *, bfd_signed_vma, |
| 94 | struct bfd_section * (*) (const char *, struct bfd_section *), |
| 95 | void (*) (void)); |
| 96 | extern bfd_boolean elf32_aarch64_build_stubs |
| 97 | (struct bfd_link_info *); |
| 98 | |
| 99 | /* Take the PAGE component of an address or offset. */ |
| 100 | #define PG(x) ((x) & ~ (bfd_vma) 0xfff) |
| 101 | #define PG_OFFSET(x) ((x) & (bfd_vma) 0xfff) |
| 102 | |
| 103 | #define AARCH64_ADR_OP 0x10000000 |
| 104 | #define AARCH64_ADRP_OP 0x90000000 |
| 105 | #define AARCH64_ADRP_OP_MASK 0x9F000000 |
| 106 | |
| 107 | extern bfd_signed_vma |
| 108 | _bfd_aarch64_sign_extend (bfd_vma, int); |
| 109 | |
| 110 | extern uint32_t |
| 111 | _bfd_aarch64_decode_adrp_imm (uint32_t); |
| 112 | |
| 113 | extern uint32_t |
| 114 | _bfd_aarch64_reencode_adr_imm (uint32_t, uint32_t); |
| 115 | |
| 116 | extern bfd_reloc_status_type |
| 117 | _bfd_aarch64_elf_put_addend (bfd *, bfd_byte *, bfd_reloc_code_real_type, |
| 118 | reloc_howto_type *, bfd_signed_vma); |
| 119 | |
| 120 | extern bfd_vma |
| 121 | _bfd_aarch64_elf_resolve_relocation (bfd *, bfd_reloc_code_real_type, bfd_vma, |
| 122 | bfd_vma, bfd_vma, bfd_boolean); |
| 123 | |
| 124 | extern bfd_boolean |
| 125 | _bfd_aarch64_elf_grok_prstatus (bfd *, Elf_Internal_Note *); |
| 126 | |
| 127 | extern bfd_boolean |
| 128 | _bfd_aarch64_elf_grok_psinfo (bfd *, Elf_Internal_Note *); |
| 129 | |
| 130 | extern char * |
| 131 | _bfd_aarch64_elf_write_core_note (bfd *, char *, int *, int, ...); |
| 132 | |
| 133 | #define elf_backend_grok_prstatus _bfd_aarch64_elf_grok_prstatus |
| 134 | #define elf_backend_grok_psinfo _bfd_aarch64_elf_grok_psinfo |
| 135 | #define elf_backend_write_core_note _bfd_aarch64_elf_write_core_note |
| 136 | |
| 137 | extern bfd * |
| 138 | _bfd_aarch64_elf_link_setup_gnu_properties (struct bfd_link_info *, |
| 139 | uint32_t *); |
| 140 | |
| 141 | extern enum elf_property_kind |
| 142 | _bfd_aarch64_elf_parse_gnu_properties (bfd *, unsigned int, |
| 143 | bfd_byte *, unsigned int); |
| 144 | |
| 145 | extern bfd_boolean |
| 146 | _bfd_aarch64_elf_merge_gnu_properties (struct bfd_link_info *, bfd *, |
| 147 | elf_property *, elf_property *, |
| 148 | uint32_t); |
| 149 | |
| 150 | extern void |
| 151 | _bfd_aarch64_elf_link_fixup_gnu_properties (struct bfd_link_info *, |
| 152 | elf_property_list **); |
| 153 | |
| 154 | #define elf_backend_parse_gnu_properties \ |
| 155 | _bfd_aarch64_elf_parse_gnu_properties |
| 156 | |
| 157 | #define elf_backend_fixup_gnu_properties \ |
| 158 | _bfd_aarch64_elf_link_fixup_gnu_properties |