gas/config/tc-aarch64.h

   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 #define TC_FRAG_INIT(fragp, max_bytes) aarch64_init_frag (fragp, max_bytes)
 177 #define HANDLE_ALIGN(fragp)     aarch64_handle_align (fragp)
 178
 179 #define md_do_align(N, FILL, LEN, MAX, LABEL)                                   \
 180   if (FILL == NULL && (N) != 0 && ! need_pass_2 && subseg_text_p (now_seg))     \
 181     {                                                                           \
 182       frag_align_code (N, MAX);                                                 \
 183       goto LABEL;                                                               \
 184     }
 185
 186 #define SUB_SEGMENT_ALIGN(SEG, FRCHAIN) 0
 187
 188 #define DWARF2_LINE_MIN_INSN_LENGTH     4
 189
 190 /* The lr register is r30.  */
 191 #define DWARF2_DEFAULT_RETURN_COLUMN  30
 192
 193 /* Registers are generally saved at negative offsets to the CFA.  */
 194 #define DWARF2_CIE_DATA_ALIGNMENT     (-8)
 195
 196 extern int aarch64_dwarf2_addr_size (void);
 197 #define DWARF2_ADDR_SIZE(bfd) aarch64_dwarf2_addr_size ()
 198
 199 #ifdef OBJ_ELF
 200 # define obj_frob_symbol(sym, punt)     aarch64elf_frob_symbol ((sym), & (punt))
 201
 202 # define GLOBAL_OFFSET_TABLE_NAME       "_GLOBAL_OFFSET_TABLE_"
 203 # define TC_SEGMENT_INFO_TYPE           struct aarch64_segment_info_type
 204
 205 /* This is not really an alignment operation, but it's something we
 206    need to do at the same time: whenever we are figuring out the
 207    alignment for data, we should check whether a $d symbol is
 208    necessary.  */
 209 # define md_cons_align(nbytes)          mapping_state (MAP_DATA)
 210
 211 enum mstate
 212 {
 213   MAP_UNDEFINED = 0, /* Must be zero, for seginfo in new sections.  */
 214   MAP_DATA,
 215   MAP_INSN,
 216 };
 217
 218 void mapping_state (enum mstate);
 219
 220 struct aarch64_segment_info_type
 221 {
 222   enum mstate mapstate;
 223   unsigned int marked_pr_dependency;
 224   aarch64_instr_sequence insn_sequence;
 225 };
 226
 227 /* We want .cfi_* pseudo-ops for generating unwind info.  */
 228 #define TARGET_USE_CFIPOP              1
 229
 230 /* CFI hooks.  */
 231 #define tc_regname_to_dw2regnum            tc_aarch64_regname_to_dw2regnum
 232 #define tc_cfi_frame_initial_instructions  tc_aarch64_frame_initial_instructions
 233
 234 extern void aarch64_after_parse_args (void);
 235 #define md_after_parse_args() aarch64_after_parse_args ()
 236
 237 #else /* Not OBJ_ELF.  */
 238 #define GLOBAL_OFFSET_TABLE_NAME "__GLOBAL_OFFSET_TABLE_"
 239 #endif
 240
 241 #if defined OBJ_ELF || defined OBJ_COFF
 242
 243 # define EXTERN_FORCE_RELOC                     1
 244 # define tc_fix_adjustable(FIX)                 1
 245 /* Values passed to md_apply_fix don't include the symbol value.  */
 246 # define MD_APPLY_SYM_VALUE(FIX)                0
 247
 248 #endif
 249
 250 #define MD_PCREL_FROM_SECTION(F,S) md_pcrel_from_section(F,S)
 251
 252 extern long md_pcrel_from_section (struct fix *, segT);
 253 extern void aarch64_frag_align_code (int, int);
 254 extern const char * elf64_aarch64_target_format (void);
 255 extern int aarch64_force_relocation (struct fix *);
 256 extern void aarch64_cleanup (void);
 257 extern void aarch64_start_line_hook (void);
 258 extern void aarch64_frob_label (symbolS *);
 259 extern void aarch64_frob_section (asection *sec);
 260 extern int aarch64_data_in_code (void);
 261 extern char * aarch64_canonicalize_symbol_name (char *);
 262 extern void aarch64_adjust_symtab (void);
 263 extern void aarch64elf_frob_symbol (symbolS *, int *);
 264 extern void cons_fix_new_aarch64 (fragS *, int, int, expressionS *);
 265 extern void aarch64_init_frag (struct frag *, int);
 266 extern void aarch64_handle_align (struct frag *);
 267 extern int tc_aarch64_regname_to_dw2regnum (char *regname);
 268 extern void tc_aarch64_frame_initial_instructions (void);
 269
 270 #ifdef TE_PE
 271
 272 #define O_secrel O_md1
 273
 274 #define TC_DWARF2_EMIT_OFFSET  tc_pe_dwarf2_emit_offset
 275 void tc_pe_dwarf2_emit_offset (symbolS *, unsigned int);
 276
 277 #endif /* TE_PE */
 278
 279 #endif /* TC_AARCH64 */