gas/config/tc-aarch64.h

   1 /* tc-aarch64.h -- Header file for tc-aarch64.c.
   2    Copyright (C) 2009-2022 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 #ifdef OBJ_ELF
  63 # define AARCH64_BI_ENDIAN
  64 # define TARGET_FORMAT  elf64_aarch64_target_format ()
  65 #elif defined (OBJ_COFF)
  66 # define TARGET_FORMAT coff_aarch64_target_format ()
  67 #endif
  68
  69 #define TC_FORCE_RELOCATION(FIX) aarch64_force_relocation (FIX)
  70
  71 /* Currently there is no machine specific frags generated.  */
  72 #define md_convert_frag(b,s,f) as_fatal ("aarch64 convert_frag called\n")
  73
  74 #define md_cleanup() aarch64_cleanup ()
  75
  76 #define md_start_line_hook() aarch64_start_line_hook ()
  77
  78 #define tc_frob_label(S) aarch64_frob_label (S)
  79
  80 /* We also need to mark assembler created symbols:  */
  81 #define tc_frob_fake_label(S) aarch64_frob_label (S)
  82
  83 #define tc_frob_section(S) aarch64_frob_section (S)
  84
  85 /* The key used to sign a function's return address.  */
  86 enum pointer_auth_key {
  87   AARCH64_PAUTH_KEY_A,
  88   AARCH64_PAUTH_KEY_B
  89 };
  90
  91 /* The extra fields required by AArch64 in fde_entry and cie_entry.  Currently
  92    only used to store the key used to sign the frame's return address.  */
  93 #define tc_fde_entry_extras enum pointer_auth_key pauth_key;
  94 #define tc_cie_entry_extras enum pointer_auth_key pauth_key;
  95
  96 /* The extra initialisation steps needed by AArch64 in alloc_fde_entry.
  97    Currently only used to initialise the key used to sign the return
  98    address.  */
  99 #define tc_fde_entry_init_extra(fde) fde->pauth_key = AARCH64_PAUTH_KEY_A;
 100
 101 /* Extra checks required by AArch64 when outputting the current cie_entry.
 102    Currently only used to output a 'B' if the return address is signed with the
 103    B key.  */
 104 #define tc_output_cie_extra(cie) \
 105     do \
 106       { \
 107         if (cie->pauth_key == AARCH64_PAUTH_KEY_B) \
 108           out_one ('B'); \
 109       } \
 110     while (0)
 111
 112 /* Extra equivalence checks required by AArch64 when selecting the correct cie
 113    for some fde.  Currently only used to check for quivalence between keys used
 114    to sign ther return address.  */
 115 #define tc_cie_fde_equivalent_extra(cie, fde) (cie->pauth_key == fde->pauth_key)
 116
 117 /* The extra initialisation steps needed by AArch64 in select_cie_for_fde.
 118    Currently only used to initialise the key used to sign the return
 119    address.  */
 120 #define tc_cie_entry_init_extra(cie, fde) cie->pauth_key = fde->pauth_key;
 121
 122 #define TC_FIX_TYPE struct aarch64_fix
 123 #define TC_INIT_FIX_DATA(FIX) { (FIX)->tc_fix_data.inst = NULL; \
 124     (FIX)->tc_fix_data.opnd = AARCH64_OPND_NIL; }
 125
 126 #define TC_SYMFIELD_TYPE        unsigned int
 127 #define AARCH64_GET_FLAG(s)     (*symbol_get_tc (s))
 128
 129 void aarch64_copy_symbol_attributes (symbolS *, symbolS *);
 130 #ifndef TC_COPY_SYMBOL_ATTRIBUTES
 131 #define TC_COPY_SYMBOL_ATTRIBUTES(DEST, SRC) \
 132   (aarch64_copy_symbol_attributes (DEST, SRC))
 133 #endif
 134
 135 #ifdef OBJ_ELF
 136 void aarch64_elf_copy_symbol_attributes (symbolS *, symbolS *);
 137 #define OBJ_COPY_SYMBOL_ATTRIBUTES(DEST, SRC) \
 138   aarch64_elf_copy_symbol_attributes (DEST, SRC)
 139 #endif
 140
 141 #define TC_START_LABEL(STR, NUL_CHAR, NEXT_CHAR)                        \
 142   (NEXT_CHAR == ':' || (NEXT_CHAR == '/' && aarch64_data_in_code ()))
 143 #define tc_canonicalize_symbol_name(str) aarch64_canonicalize_symbol_name (str);
 144 #define obj_adjust_symtab()              aarch64_adjust_symtab ()
 145
 146 #define LISTING_HEADER "AARCH64 GAS "
 147
 148 #define LOCAL_LABEL(name)  (name[0] == '.' && name[1] == 'L')
 149 #define LOCAL_LABELS_FB    1
 150
 151 /* This expression evaluates to true if the relocation is for a local
 152    object for which we still want to do the relocation at runtime.
 153    False if we are willing to perform this relocation while building
 154    the .o file.  GOTOFF does not need to be checked here because it is
 155    not pcrel.  I am not sure if some of the others are ever used with
 156    pcrel, but it is easier to be safe than sorry.  */
 157
 158 #define TC_FORCE_RELOCATION_LOCAL(FIX)                  \
 159   (GENERIC_FORCE_RELOCATION_LOCAL (FIX)                 \
 160    || (FIX)->fx_r_type == BFD_RELOC_64                  \
 161    || (FIX)->fx_r_type == BFD_RELOC_32)
 162
 163 #define TC_CONS_FIX_NEW(f,w,s,e,r) cons_fix_new_aarch64 ((f), (w), (s), (e))
 164
 165 /* Max space for a rs_align_code fragment is 3 unaligned bytes
 166    (fr_fix) plus 4 bytes to contain the repeating NOP (fr_var).  */
 167 #define MAX_MEM_FOR_RS_ALIGN_CODE 7
 168
 169 /* For frags in code sections we need to record whether they contain
 170    code or data.  */
 171 struct aarch64_frag_type
 172 {
 173   int recorded;
 174 #if defined OBJ_ELF || defined OBJ_COFF
 175   /* If there is a mapping symbol at offset 0 in this frag,
 176      it will be saved in FIRST_MAP.  If there are any mapping
 177      symbols in this frag, the last one will be saved in
 178      LAST_MAP.  */
 179   symbolS *first_map, *last_map;
 180 #endif
 181 };
 182
 183 #define TC_FRAG_TYPE            struct aarch64_frag_type
 184 #define TC_FRAG_INIT(fragp, max_bytes) aarch64_init_frag (fragp, max_bytes)
 185 #define HANDLE_ALIGN(fragp)     aarch64_handle_align (fragp)
 186
 187 #define md_do_align(N, FILL, LEN, MAX, LABEL)                                   \
 188   if (FILL == NULL && (N) != 0 && ! need_pass_2 && subseg_text_p (now_seg))     \
 189     {                                                                           \
 190       frag_align_code (N, MAX);                                                 \
 191       goto LABEL;                                                               \
 192     }
 193
 194 #define SUB_SEGMENT_ALIGN(SEG, FRCHAIN) 0
 195
 196 #define DWARF2_LINE_MIN_INSN_LENGTH     4
 197
 198 /* The lr register is r30.  */
 199 #define DWARF2_DEFAULT_RETURN_COLUMN  30
 200
 201 /* Registers are generally saved at negative offsets to the CFA.  */
 202 #define DWARF2_CIE_DATA_ALIGNMENT     (-8)
 203
 204 extern int aarch64_dwarf2_addr_size (void);
 205 #define DWARF2_ADDR_SIZE(bfd) aarch64_dwarf2_addr_size ()
 206
 207 #if defined OBJ_ELF || defined OBJ_COFF
 208 #ifdef OBJ_ELF
 209 # define obj_frob_symbol(sym, punt)     aarch64elf_frob_symbol ((sym), & (punt))
 210 #endif
 211
 212 # define GLOBAL_OFFSET_TABLE_NAME       "_GLOBAL_OFFSET_TABLE_"
 213 # define TC_SEGMENT_INFO_TYPE           struct aarch64_segment_info_type
 214
 215 /* This is not really an alignment operation, but it's something we
 216    need to do at the same time: whenever we are figuring out the
 217    alignment for data, we should check whether a $d symbol is
 218    necessary.  */
 219 # define md_cons_align(nbytes)          mapping_state (MAP_DATA)
 220
 221 enum mstate
 222 {
 223   MAP_UNDEFINED = 0, /* Must be zero, for seginfo in new sections.  */
 224   MAP_DATA,
 225   MAP_INSN,
 226 };
 227
 228 void mapping_state (enum mstate);
 229
 230 struct aarch64_segment_info_type
 231 {
 232   const char *last_file;
 233   unsigned last_line;
 234   enum mstate mapstate;
 235   unsigned int marked_pr_dependency;
 236   aarch64_instr_sequence insn_sequence;
 237 };
 238
 239 /* We want .cfi_* pseudo-ops for generating unwind info.  */
 240 #define TARGET_USE_CFIPOP              1
 241
 242 /* CFI hooks.  */
 243 #define tc_regname_to_dw2regnum            tc_aarch64_regname_to_dw2regnum
 244 #define tc_cfi_frame_initial_instructions  tc_aarch64_frame_initial_instructions
 245
 246 extern void aarch64_after_parse_args (void);
 247 #define md_after_parse_args() aarch64_after_parse_args ()
 248
 249 #else /* Not OBJ_ELF.  */
 250 #define GLOBAL_OFFSET_TABLE_NAME "__GLOBAL_OFFSET_TABLE_"
 251 #endif
 252
 253 #if defined OBJ_ELF || defined OBJ_COFF
 254
 255 # define EXTERN_FORCE_RELOC                     1
 256 # define tc_fix_adjustable(FIX)                 1
 257 /* Values passed to md_apply_fix don't include the symbol value.  */
 258 # define MD_APPLY_SYM_VALUE(FIX)                0
 259
 260 #endif
 261
 262 #define MD_PCREL_FROM_SECTION(F,S) md_pcrel_from_section(F,S)
 263
 264 extern void aarch64_frag_align_code (int, int);
 265 extern const char * elf64_aarch64_target_format (void);
 266 extern const char * coff_aarch64_target_format (void);
 267 extern int aarch64_force_relocation (struct fix *);
 268 extern void aarch64_cleanup (void);
 269 extern void aarch64_start_line_hook (void);
 270 extern void aarch64_frob_label (symbolS *);
 271 extern void aarch64_frob_section (asection *sec);
 272 extern int aarch64_data_in_code (void);
 273 extern char * aarch64_canonicalize_symbol_name (char *);
 274 extern void aarch64_adjust_symtab (void);
 275 extern void aarch64elf_frob_symbol (symbolS *, int *);
 276 extern void cons_fix_new_aarch64 (fragS *, int, int, expressionS *);
 277 extern void aarch64_init_frag (struct frag *, int);
 278 extern void aarch64_handle_align (struct frag *);
 279 extern int tc_aarch64_regname_to_dw2regnum (char *regname);
 280 extern void tc_aarch64_frame_initial_instructions (void);
 281
 282 #endif /* TC_AARCH64 */