| 1 | /* tc-aarch64.h -- Header file for tc-aarch64.c. |
| 2 | Copyright (C) 2009-2019 Free Software Foundation, Inc. |
| 3 | Contributed by ARM Ltd. |
| 4 | |
| 5 | This file is part of GAS. |
| 6 | |
| 7 | GAS 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 | GAS 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 | #ifndef TC_AARCH64 |
| 22 | #define TC_AARCH64 1 |
| 23 | |
| 24 | #include "opcode/aarch64.h" |
| 25 | |
| 26 | #ifndef TARGET_BYTES_BIG_ENDIAN |
| 27 | #define TARGET_BYTES_BIG_ENDIAN 0 |
| 28 | #endif |
| 29 | |
| 30 | #define WORKING_DOT_WORD |
| 31 | |
| 32 | #define TARGET_ARCH bfd_arch_aarch64 |
| 33 | |
| 34 | #define DIFF_EXPR_OK |
| 35 | |
| 36 | /* Permit // comments. */ |
| 37 | #define DOUBLESLASH_LINE_COMMENTS |
| 38 | |
| 39 | #ifdef LITTLE_ENDIAN |
| 40 | #undef LITTLE_ENDIAN |
| 41 | #endif |
| 42 | |
| 43 | #ifdef BIG_ENDIAN |
| 44 | #undef BIG_ENDIAN |
| 45 | #endif |
| 46 | |
| 47 | #define LITTLE_ENDIAN 1234 |
| 48 | #define BIG_ENDIAN 4321 |
| 49 | |
| 50 | #define SWAP_32(n) \ |
| 51 | ((((n) & 0xff) << 24) | (((n) & 0xff00) << 8) | (((n) >> 8) & 0xff00) \ |
| 52 | | (((n) >> 24) & 0xff)) |
| 53 | |
| 54 | struct fix; |
| 55 | |
| 56 | struct aarch64_fix |
| 57 | { |
| 58 | struct aarch64_inst *inst; |
| 59 | enum aarch64_opnd opnd; |
| 60 | }; |
| 61 | |
| 62 | #if defined OBJ_ELF |
| 63 | # define AARCH64_BI_ENDIAN |
| 64 | # define TARGET_FORMAT elf64_aarch64_target_format () |
| 65 | #endif |
| 66 | |
| 67 | #define TC_FORCE_RELOCATION(FIX) aarch64_force_relocation (FIX) |
| 68 | |
| 69 | /* Currently there is no machine specific frags generated. */ |
| 70 | #define md_convert_frag(b,s,f) as_fatal ("aarch64 convert_frag called\n") |
| 71 | |
| 72 | #define md_cleanup() aarch64_cleanup () |
| 73 | |
| 74 | #define md_start_line_hook() aarch64_start_line_hook () |
| 75 | |
| 76 | #define tc_frob_label(S) aarch64_frob_label (S) |
| 77 | |
| 78 | /* We also need to mark assembler created symbols: */ |
| 79 | #define tc_frob_fake_label(S) aarch64_frob_label (S) |
| 80 | |
| 81 | #define tc_frob_section(S) aarch64_frob_section (S) |
| 82 | |
| 83 | /* The key used to sign a function's return address. */ |
| 84 | enum pointer_auth_key { |
| 85 | AARCH64_PAUTH_KEY_A, |
| 86 | AARCH64_PAUTH_KEY_B |
| 87 | }; |
| 88 | |
| 89 | /* The extra fields required by AArch64 in fde_entry and cie_entry. Currently |
| 90 | only used to store the key used to sign the frame's return address. */ |
| 91 | #define tc_fde_entry_extras enum pointer_auth_key pauth_key; |
| 92 | #define tc_cie_entry_extras enum pointer_auth_key pauth_key; |
| 93 | |
| 94 | /* The extra initialisation steps needed by AArch64 in alloc_fde_entry. |
| 95 | Currently only used to initialise the key used to sign the return |
| 96 | address. */ |
| 97 | #define tc_fde_entry_init_extra(fde) fde->pauth_key = AARCH64_PAUTH_KEY_A; |
| 98 | |
| 99 | /* Extra checks required by AArch64 when outputting the current cie_entry. |
| 100 | Currently only used to output a 'B' if the return address is signed with the |
| 101 | B key. */ |
| 102 | #define tc_output_cie_extra(cie) \ |
| 103 | do \ |
| 104 | { \ |
| 105 | if (cie->pauth_key == AARCH64_PAUTH_KEY_B) \ |
| 106 | out_one ('B'); \ |
| 107 | } \ |
| 108 | while (0) |
| 109 | |
| 110 | /* Extra equivalence checks required by AArch64 when selecting the correct cie |
| 111 | for some fde. Currently only used to check for quivalence between keys used |
| 112 | to sign ther return address. */ |
| 113 | #define tc_cie_fde_equivalent_extra(cie, fde) (cie->pauth_key == fde->pauth_key) |
| 114 | |
| 115 | /* The extra initialisation steps needed by AArch64 in select_cie_for_fde. |
| 116 | Currently only used to initialise the key used to sign the return |
| 117 | address. */ |
| 118 | #define tc_cie_entry_init_extra(cie, fde) cie->pauth_key = fde->pauth_key; |
| 119 | |
| 120 | #define TC_FIX_TYPE struct aarch64_fix |
| 121 | #define TC_INIT_FIX_DATA(FIX) { (FIX)->tc_fix_data.inst = NULL; \ |
| 122 | (FIX)->tc_fix_data.opnd = AARCH64_OPND_NIL; } |
| 123 | |
| 124 | #define TC_SYMFIELD_TYPE unsigned int |
| 125 | #define AARCH64_GET_FLAG(s) (*symbol_get_tc (s)) |
| 126 | |
| 127 | void aarch64_copy_symbol_attributes (symbolS *, symbolS *); |
| 128 | #ifndef TC_COPY_SYMBOL_ATTRIBUTES |
| 129 | #define TC_COPY_SYMBOL_ATTRIBUTES(DEST, SRC) \ |
| 130 | (aarch64_copy_symbol_attributes (DEST, SRC)) |
| 131 | #endif |
| 132 | |
| 133 | #define TC_START_LABEL(STR, NUL_CHAR, NEXT_CHAR) \ |
| 134 | (NEXT_CHAR == ':' || (NEXT_CHAR == '/' && aarch64_data_in_code ())) |
| 135 | #define tc_canonicalize_symbol_name(str) aarch64_canonicalize_symbol_name (str); |
| 136 | #define obj_adjust_symtab() aarch64_adjust_symtab () |
| 137 | |
| 138 | #define LISTING_HEADER "AARCH64 GAS " |
| 139 | |
| 140 | #define LOCAL_LABEL(name) (name[0] == '.' && name[1] == 'L') |
| 141 | #define LOCAL_LABELS_FB 1 |
| 142 | |
| 143 | /* This expression evaluates to true if the relocation is for a local |
| 144 | object for which we still want to do the relocation at runtime. |
| 145 | False if we are willing to perform this relocation while building |
| 146 | the .o file. GOTOFF does not need to be checked here because it is |
| 147 | not pcrel. I am not sure if some of the others are ever used with |
| 148 | pcrel, but it is easier to be safe than sorry. */ |
| 149 | |
| 150 | #define TC_FORCE_RELOCATION_LOCAL(FIX) \ |
| 151 | (GENERIC_FORCE_RELOCATION_LOCAL (FIX) \ |
| 152 | || (FIX)->fx_r_type == BFD_RELOC_64 \ |
| 153 | || (FIX)->fx_r_type == BFD_RELOC_32) |
| 154 | |
| 155 | #define TC_CONS_FIX_NEW(f,w,s,e,r) cons_fix_new_aarch64 ((f), (w), (s), (e)) |
| 156 | |
| 157 | /* Max space for a rs_align_code fragment is 3 unaligned bytes |
| 158 | (fr_fix) plus 4 bytes to contain the repeating NOP (fr_var). */ |
| 159 | #define MAX_MEM_FOR_RS_ALIGN_CODE 7 |
| 160 | |
| 161 | /* For frags in code sections we need to record whether they contain |
| 162 | code or data. */ |
| 163 | struct aarch64_frag_type |
| 164 | { |
| 165 | int recorded; |
| 166 | #ifdef OBJ_ELF |
| 167 | /* If there is a mapping symbol at offset 0 in this frag, |
| 168 | it will be saved in FIRST_MAP. If there are any mapping |
| 169 | symbols in this frag, the last one will be saved in |
| 170 | LAST_MAP. */ |
| 171 | symbolS *first_map, *last_map; |
| 172 | #endif |
| 173 | }; |
| 174 | |
| 175 | #define TC_FRAG_TYPE struct aarch64_frag_type |
| 176 | /* NOTE: max_chars is a local variable from frag_var / frag_variant. */ |
| 177 | #define TC_FRAG_INIT(fragp) aarch64_init_frag (fragp, max_chars) |
| 178 | #define HANDLE_ALIGN(fragp) aarch64_handle_align (fragp) |
| 179 | |
| 180 | #define md_do_align(N, FILL, LEN, MAX, LABEL) \ |
| 181 | if (FILL == NULL && (N) != 0 && ! need_pass_2 && subseg_text_p (now_seg)) \ |
| 182 | { \ |
| 183 | frag_align_code (N, MAX); \ |
| 184 | goto LABEL; \ |
| 185 | } |
| 186 | |
| 187 | #define SUB_SEGMENT_ALIGN(SEG, FRCHAIN) 0 |
| 188 | |
| 189 | #define DWARF2_LINE_MIN_INSN_LENGTH 4 |
| 190 | |
| 191 | /* The lr register is r30. */ |
| 192 | #define DWARF2_DEFAULT_RETURN_COLUMN 30 |
| 193 | |
| 194 | /* Registers are generally saved at negative offsets to the CFA. */ |
| 195 | #define DWARF2_CIE_DATA_ALIGNMENT (-8) |
| 196 | |
| 197 | extern int aarch64_dwarf2_addr_size (void); |
| 198 | #define DWARF2_ADDR_SIZE(bfd) aarch64_dwarf2_addr_size () |
| 199 | |
| 200 | #ifdef OBJ_ELF |
| 201 | # define obj_frob_symbol(sym, punt) aarch64elf_frob_symbol ((sym), & (punt)) |
| 202 | |
| 203 | # define GLOBAL_OFFSET_TABLE_NAME "_GLOBAL_OFFSET_TABLE_" |
| 204 | # define TC_SEGMENT_INFO_TYPE struct aarch64_segment_info_type |
| 205 | |
| 206 | /* This is not really an alignment operation, but it's something we |
| 207 | need to do at the same time: whenever we are figuring out the |
| 208 | alignment for data, we should check whether a $d symbol is |
| 209 | necessary. */ |
| 210 | # define md_cons_align(nbytes) mapping_state (MAP_DATA) |
| 211 | |
| 212 | enum mstate |
| 213 | { |
| 214 | MAP_UNDEFINED = 0, /* Must be zero, for seginfo in new sections. */ |
| 215 | MAP_DATA, |
| 216 | MAP_INSN, |
| 217 | }; |
| 218 | |
| 219 | void mapping_state (enum mstate); |
| 220 | |
| 221 | struct aarch64_segment_info_type |
| 222 | { |
| 223 | enum mstate mapstate; |
| 224 | unsigned int marked_pr_dependency; |
| 225 | aarch64_instr_sequence insn_sequence; |
| 226 | }; |
| 227 | |
| 228 | /* We want .cfi_* pseudo-ops for generating unwind info. */ |
| 229 | #define TARGET_USE_CFIPOP 1 |
| 230 | |
| 231 | /* CFI hooks. */ |
| 232 | #define tc_regname_to_dw2regnum tc_aarch64_regname_to_dw2regnum |
| 233 | #define tc_cfi_frame_initial_instructions tc_aarch64_frame_initial_instructions |
| 234 | |
| 235 | extern void aarch64_after_parse_args (void); |
| 236 | #define md_after_parse_args() aarch64_after_parse_args () |
| 237 | |
| 238 | #else /* Not OBJ_ELF. */ |
| 239 | #define GLOBAL_OFFSET_TABLE_NAME "__GLOBAL_OFFSET_TABLE_" |
| 240 | #endif |
| 241 | |
| 242 | #if defined OBJ_ELF || defined OBJ_COFF |
| 243 | |
| 244 | # define EXTERN_FORCE_RELOC 1 |
| 245 | # define tc_fix_adjustable(FIX) 1 |
| 246 | /* Values passed to md_apply_fix don't include the symbol value. */ |
| 247 | # define MD_APPLY_SYM_VALUE(FIX) 0 |
| 248 | |
| 249 | #endif |
| 250 | |
| 251 | #define MD_PCREL_FROM_SECTION(F,S) md_pcrel_from_section(F,S) |
| 252 | |
| 253 | extern long md_pcrel_from_section (struct fix *, segT); |
| 254 | extern void aarch64_frag_align_code (int, int); |
| 255 | extern const char * elf64_aarch64_target_format (void); |
| 256 | extern int aarch64_force_relocation (struct fix *); |
| 257 | extern void aarch64_cleanup (void); |
| 258 | extern void aarch64_start_line_hook (void); |
| 259 | extern void aarch64_frob_label (symbolS *); |
| 260 | extern void aarch64_frob_section (asection *sec); |
| 261 | extern int aarch64_data_in_code (void); |
| 262 | extern char * aarch64_canonicalize_symbol_name (char *); |
| 263 | extern void aarch64_adjust_symtab (void); |
| 264 | extern void aarch64elf_frob_symbol (symbolS *, int *); |
| 265 | extern void cons_fix_new_aarch64 (fragS *, int, int, expressionS *); |
| 266 | extern void aarch64_init_frag (struct frag *, int); |
| 267 | extern void aarch64_handle_align (struct frag *); |
| 268 | extern int tc_aarch64_regname_to_dw2regnum (char *regname); |
| 269 | extern void tc_aarch64_frame_initial_instructions (void); |
| 270 | |
| 271 | #ifdef TE_PE |
| 272 | |
| 273 | #define O_secrel O_md1 |
| 274 | |
| 275 | #define TC_DWARF2_EMIT_OFFSET tc_pe_dwarf2_emit_offset |
| 276 | void tc_pe_dwarf2_emit_offset (symbolS *, unsigned int); |
| 277 | |
| 278 | #endif /* TE_PE */ |
| 279 | |
| 280 | #endif /* TC_AARCH64 */ |