| 1 | /* NDS32-specific support for 32-bit ELF. |
| 2 | Copyright (C) 2012-2016 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 | /* Relocation flags encoded in r_addend. */ |
| 26 | |
| 27 | /* Relocation flags for R_NDS32_ERLAX_ENTRY. */ |
| 28 | |
| 29 | /* Set if relax on this section is done or disabled. */ |
| 30 | #define R_NDS32_RELAX_ENTRY_DISABLE_RELAX_FLAG (1 << 31) |
| 31 | /* Optimize for performance. */ |
| 32 | #define R_NDS32_RELAX_ENTRY_OPTIMIZE_FLAG (1 << 30) |
| 33 | /* Optimize for size. Branch destination 4-byte adjustment |
| 34 | may be disabled. */ |
| 35 | #define R_NDS32_RELAX_ENTRY_OPTIMIZE_FOR_SPACE_FLAG (1 << 29) |
| 36 | /* To distinguish the assembly code generated by compiler |
| 37 | or written manually. */ |
| 38 | #define R_NDS32_RELAX_ENTRY_VERBATIM_FLAG (1 << 28) |
| 39 | /* EX9 and link-time IFC must be explicitly enabled, so we |
| 40 | won't mess up handcraft assembly code. */ |
| 41 | /* Enable EX9 optimization for this section. */ |
| 42 | #define R_NDS32_RELAX_ENTRY_EX9_FLAG (1 << 2) |
| 43 | /* Enable IFC optimization for this section. */ |
| 44 | #define R_NDS32_RELAX_ENTRY_IFC_FLAG (1 << 3) |
| 45 | |
| 46 | |
| 47 | /* Relocation flags for R_NDS32_INSN16. */ |
| 48 | |
| 49 | /* Tag the nop16 can be removed. */ |
| 50 | #define R_NDS32_INSN16_CONVERT_FLAG (1 << 0) |
| 51 | /* Convert a gp-relative access (e.g., lwi.gp) |
| 52 | to fp-as-gp access (lwi37.fp). |
| 53 | This value is used by linker internally only. |
| 54 | It's fine to change the vlaue. */ |
| 55 | #define R_NDS32_INSN16_FP7U2_FLAG (1 << 1) |
| 56 | |
| 57 | /* Relocation flags for R_NDS32_RELAX_REGION_OMIT_FP_START/END. */ |
| 58 | |
| 59 | /* OMIT_FP_FLAG marks the region for applying fp-as-gp |
| 60 | optimization. */ |
| 61 | #define R_NDS32_RELAX_REGION_OMIT_FP_FLAG (1 << 0) |
| 62 | /* NOT_OMIT_FP_FLAG is set if this region is not worth |
| 63 | for fp-as-gp. */ |
| 64 | #define R_NDS32_RELAX_REGION_NOT_OMIT_FP_FLAG (1 << 1) |
| 65 | /* Suppress EX9 optimization in the region. */ |
| 66 | #define R_NDS32_RELAX_REGION_NO_EX9_FLAG (1 << 2) |
| 67 | /* A Innermost loop region. Some optimizations is suppressed |
| 68 | in this region due to performance drop. */ |
| 69 | #define R_NDS32_RELAX_REGION_INNERMOST_LOOP_FLAG (1 << 4) |
| 70 | |
| 71 | /* Tag range for LOADSTORE relocation. */ |
| 72 | enum |
| 73 | { |
| 74 | NDS32_LOADSTORE_NONE = 0x0, |
| 75 | NDS32_LOADSTORE_BYTE = 0x1, |
| 76 | NDS32_LOADSTORE_HALF = 0x2, |
| 77 | NDS32_LOADSTORE_WORD = 0x4, |
| 78 | NDS32_LOADSTORE_FLOAT_S = 0x8, |
| 79 | NDS32_LOADSTORE_FLOAT_D = 0x10, |
| 80 | NDS32_LOADSTORE_IMM = 0x20 |
| 81 | }; |
| 82 | |
| 83 | /* Relax tag for nds32_elf_relax_section, we have to specify which |
| 84 | optimization do in this round. */ |
| 85 | enum |
| 86 | { |
| 87 | NDS32_RELAX_NONE_ROUND = 0, |
| 88 | NDS32_RELAX_NORMAL_ROUND, |
| 89 | NDS32_RELAX_JUMP_IFC_ROUND, |
| 90 | NDS32_RELAX_EX9_BUILD_ROUND, |
| 91 | NDS32_RELAX_EX9_REPLACE_ROUND, |
| 92 | NDS32_RELAX_EMPTY_ROUND |
| 93 | }; |
| 94 | |
| 95 | /* Optimization status mask. */ |
| 96 | #define NDS32_RELAX_JUMP_IFC_DONE (1 << 0) |
| 97 | #define NDS32_RELAX_EX9_DONE (1 << 1) |
| 98 | |
| 99 | /* Optimization turn on mask. */ |
| 100 | #define NDS32_RELAX_JUMP_IFC_ON (1 << 0) |
| 101 | #define NDS32_RELAX_EX9_ON (1 << 1) |
| 102 | \f |
| 103 | extern void nds32_insertion_sort |
| 104 | (void *, size_t, size_t, int (*) (const void *, const void *)); |
| 105 | |
| 106 | extern int nds32_elf_ex9_init (void); |
| 107 | extern int nds32_convert_32_to_16 (bfd *, uint32_t, uint16_t *, int *); |
| 108 | extern int nds32_convert_16_to_32 (bfd *, uint16_t, uint32_t *); |
| 109 | extern void bfd_elf32_nds32_set_target_option (struct bfd_link_info *, |
| 110 | int, int, FILE *, int, |
| 111 | int, int, int, FILE *, |
| 112 | FILE *, int, int, |
| 113 | bfd_boolean, bfd_boolean); |
| 114 | |
| 115 | #define nds32_elf_hash_table(info) \ |
| 116 | (elf_hash_table_id ((struct elf_link_hash_table *) ((info)->hash)) \ |
| 117 | == NDS32_ELF_DATA ? \ |
| 118 | ((struct elf_nds32_link_hash_table *) ((info)->hash)) : NULL) |
| 119 | |
| 120 | /* Hash table structure for target nds32. There are some members to |
| 121 | save target options passed from nds32elf.em to bfd. */ |
| 122 | |
| 123 | struct elf_nds32_link_hash_table |
| 124 | { |
| 125 | struct elf_link_hash_table root; |
| 126 | |
| 127 | /* Short-cuts to get to dynamic linker sections. */ |
| 128 | asection *sgot; |
| 129 | asection *sgotplt; |
| 130 | asection *srelgot; |
| 131 | asection *splt; |
| 132 | asection *srelplt; |
| 133 | asection *sdynbss; |
| 134 | asection *srelbss; |
| 135 | |
| 136 | /* Small local sym to section mapping cache. */ |
| 137 | struct sym_cache sym_cache; |
| 138 | |
| 139 | /* Target dependent options. */ |
| 140 | int relax_fp_as_gp; /* --mrelax-omit-fp */ |
| 141 | int eliminate_gc_relocs; /* --meliminate-gc-relocs */ |
| 142 | FILE *sym_ld_script; /* --mgen-symbol-ld-script=<file> */ |
| 143 | /* Disable if linking a dynamically linked executable. */ |
| 144 | int load_store_relax; |
| 145 | int target_optimize; /* Switch optimization. */ |
| 146 | int relax_status; /* Finished optimization. */ |
| 147 | int relax_round; /* Going optimization. */ |
| 148 | FILE *ex9_export_file; /* --mexport-ex9=<file> */ |
| 149 | FILE *ex9_import_file; /* --mimport-ex9=<file> */ |
| 150 | int update_ex9_table; /* --mupdate-ex9. */ |
| 151 | int ex9_limit; |
| 152 | bfd_boolean ex9_loop_aware; /* Ignore ex9 if inside a loop. */ |
| 153 | bfd_boolean ifc_loop_aware; /* Ignore ifc if inside a loop. */ |
| 154 | }; |
| 155 | #endif |