| 1 | /* NDS32-specific support for 32-bit ELF. |
| 2 | Copyright (C) 2012-2020 Free Software Foundation, Inc. |
| 3 | Contributed by Andes Technology Corporation. |
| 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; if not, write to the Free Software |
| 19 | Foundation, Inc., 51 Franklin Street - Fifth Floor, Boston, MA |
| 20 | 02110-1301, USA.*/ |
| 21 | |
| 22 | #ifndef ELF32_NDS32_H |
| 23 | #define ELF32_NDS32_H |
| 24 | |
| 25 | #ifdef __cplusplus |
| 26 | extern "C" { |
| 27 | #endif |
| 28 | |
| 29 | /* Relocation flags encoded in r_addend. */ |
| 30 | |
| 31 | /* Relocation flags for R_NDS32_ERLAX_ENTRY. */ |
| 32 | |
| 33 | /* Set if relax on this section is done or disabled. */ |
| 34 | #define R_NDS32_RELAX_ENTRY_DISABLE_RELAX_FLAG (1u << 31) |
| 35 | /* Optimize for performance. */ |
| 36 | #define R_NDS32_RELAX_ENTRY_OPTIMIZE_FLAG (1u << 30) |
| 37 | /* Optimize for size. Branch destination 4-byte adjustment |
| 38 | may be disabled. */ |
| 39 | #define R_NDS32_RELAX_ENTRY_OPTIMIZE_FOR_SPACE_FLAG (1u << 29) |
| 40 | /* To distinguish the assembly code generated by compiler |
| 41 | or written manually. */ |
| 42 | #define R_NDS32_RELAX_ENTRY_VERBATIM_FLAG (1u << 28) |
| 43 | /* Two bits for ICT to comply with files without directive. */ |
| 44 | /* ICT small model. */ |
| 45 | #define R_NDS32_RELAX_ENTRY_ICT_SMALL (0x2u << 4) |
| 46 | /* ICT large model. */ |
| 47 | #define R_NDS32_RELAX_ENTRY_ICT_LARGE (0x3u << 4) |
| 48 | /* Mask for get ict bits. */ |
| 49 | #define R_NDS32_RELAX_ENTRY_ICT_MASK (0x3u << 4) |
| 50 | |
| 51 | |
| 52 | /* Relocation flags for R_NDS32_INSN16. */ |
| 53 | |
| 54 | /* Tag the nop16 can be removed. */ |
| 55 | #define R_NDS32_INSN16_CONVERT_FLAG (1u << 0) |
| 56 | /* Convert a gp-relative access (e.g., lwi.gp) |
| 57 | to fp-as-gp access (lwi37.fp). |
| 58 | This value is used by linker internally only. |
| 59 | It's fine to change the vlaue. */ |
| 60 | #define R_NDS32_INSN16_FP7U2_FLAG (1u << 1) |
| 61 | |
| 62 | /* Relocation flags for R_NDS32_RELAX_REGION_OMIT_FP_START/END. */ |
| 63 | |
| 64 | /* OMIT_FP_FLAG marks the region for applying fp-as-gp |
| 65 | optimization. */ |
| 66 | #define R_NDS32_RELAX_REGION_OMIT_FP_FLAG (1u << 0) |
| 67 | /* NOT_OMIT_FP_FLAG is set if this region is not worth |
| 68 | for fp-as-gp. */ |
| 69 | #define R_NDS32_RELAX_REGION_NOT_OMIT_FP_FLAG (1u << 1) |
| 70 | /* A Innermost loop region. Some optimizations is suppressed |
| 71 | in this region due to performance drop. */ |
| 72 | #define R_NDS32_RELAX_REGION_INNERMOST_LOOP_FLAG (1u << 4) |
| 73 | |
| 74 | /* Tag range for LOADSTORE relocation. */ |
| 75 | enum |
| 76 | { |
| 77 | NDS32_LOADSTORE_NONE = 0x0, |
| 78 | NDS32_LOADSTORE_BYTE = 0x1, |
| 79 | NDS32_LOADSTORE_HALF = 0x2, |
| 80 | NDS32_LOADSTORE_WORD = 0x4, |
| 81 | NDS32_LOADSTORE_FLOAT_S = 0x8, |
| 82 | NDS32_LOADSTORE_FLOAT_D = 0x10, |
| 83 | NDS32_LOADSTORE_IMM = 0x20 |
| 84 | }; |
| 85 | |
| 86 | struct section_id_list_t |
| 87 | { |
| 88 | int id; |
| 89 | struct section_id_list_t *next; |
| 90 | }; |
| 91 | |
| 92 | extern struct section_id_list_t *elf32_nds32_lookup_section_id |
| 93 | (int, struct section_id_list_t **); |
| 94 | extern int elf32_nds32_check_relax_group (bfd *, asection *); |
| 95 | extern int elf32_nds32_unify_relax_group (bfd *, asection *); |
| 96 | extern int nds32_elf_unify_tls_model (bfd *, asection *, bfd_byte *, |
| 97 | struct bfd_link_info *); |
| 98 | extern void nds32_insertion_sort |
| 99 | (void *, size_t, size_t, int (*) (const void *, const void *)); |
| 100 | |
| 101 | extern int nds32_convert_32_to_16 (bfd *, uint32_t, uint16_t *, int *); |
| 102 | extern int nds32_convert_16_to_32 (bfd *, uint16_t, uint32_t *); |
| 103 | extern void bfd_elf32_nds32_set_target_option (struct bfd_link_info *, |
| 104 | int, int, FILE *, |
| 105 | int, int, int); |
| 106 | |
| 107 | #define nds32_elf_hash_table(info) \ |
| 108 | (elf_hash_table_id ((struct elf_link_hash_table *) ((info)->hash)) \ |
| 109 | == NDS32_ELF_DATA ? \ |
| 110 | ((struct elf_nds32_link_hash_table *) ((info)->hash)) : NULL) |
| 111 | |
| 112 | #define elf32_nds32_compute_jump_table_size(htab) \ |
| 113 | ((htab)->next_tls_desc_index * 4) |
| 114 | |
| 115 | #define elf32_nds32_local_tlsdesc_gotent(bfd) \ |
| 116 | (elf_nds32_tdata (bfd)->local_tlsdesc_gotent) |
| 117 | |
| 118 | /* Hash table structure for target nds32. There are some members to |
| 119 | save target options passed from nds32elf.em to bfd. */ |
| 120 | |
| 121 | struct elf_nds32_link_hash_table |
| 122 | { |
| 123 | struct elf_link_hash_table root; |
| 124 | |
| 125 | /* Short-cuts to get to dynamic linker sections. */ |
| 126 | asection *sdynbss; |
| 127 | asection *srelbss; |
| 128 | |
| 129 | /* Small local sym to section mapping cache. */ |
| 130 | struct sym_cache sym_cache; |
| 131 | |
| 132 | /* Target dependent options. */ |
| 133 | int relax_fp_as_gp; /* --mrelax-omit-fp. */ |
| 134 | int eliminate_gc_relocs; /* --meliminate-gc-relocs. */ |
| 135 | FILE *sym_ld_script; /* --mgen-symbol-ld-script=<file>. */ |
| 136 | bfd_boolean hyper_relax; /* Relax for symbol not in RW sections. */ |
| 137 | int tls_desc_trampoline; /* --m[no-]tlsdesc-trampoline. */ |
| 138 | /* Disable if linking a dynamically linked executable. */ |
| 139 | int load_store_relax; |
| 140 | |
| 141 | /* The offset into splt of the PLT entry for the TLS descriptor |
| 142 | resolver. Special values are 0, if not necessary (or not found |
| 143 | to be necessary yet), and -1 if needed but not determined |
| 144 | yet. */ |
| 145 | bfd_vma dt_tlsdesc_plt; |
| 146 | |
| 147 | /* The offset into sgot of the GOT entry used by the PLT entry |
| 148 | above. */ |
| 149 | bfd_vma dt_tlsdesc_got; |
| 150 | |
| 151 | /* Offset in .plt section of tls_nds32_trampoline. */ |
| 152 | bfd_vma tls_trampoline; |
| 153 | |
| 154 | /* The index of the next unused R_NDS32_TLS_DESC slot in .rel.plt. */ |
| 155 | bfd_vma next_tls_desc_index; |
| 156 | |
| 157 | /* How many R_NDS32_TLS_DESC relocations were generated so far. */ |
| 158 | bfd_vma num_tls_desc; |
| 159 | |
| 160 | /* The amount of space used by the reserved portion of the sgotplt |
| 161 | section, plus whatever space is used by the jump slots. */ |
| 162 | bfd_vma sgotplt_jump_table_size; |
| 163 | |
| 164 | /* True if the target uses REL relocations. */ |
| 165 | int use_rel; |
| 166 | }; |
| 167 | |
| 168 | #ifdef __cplusplus |
| 169 | } |
| 170 | #endif |
| 171 | |
| 172 | #endif /* ELF32_NDS32_H */ |