gas/config/tc-mmix.h

   1 /* tc-mmix.h -- Header file for tc-mmix.c.
   2    Copyright (C) 2001-2019 Free Software Foundation, Inc.
   3    Written by Hans-Peter Nilsson (hp@bitrange.com).
   4
   5    This file is part of GAS, the GNU Assembler.
   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, or (at your option)
  10    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 GAS; see the file COPYING.  If not, write to the Free
  19    Software Foundation, 51 Franklin Street - Fifth Floor, Boston, MA
  20    02110-1301, USA.  */
  21
  22 #define TC_MMIX
  23
  24 /* See gas/doc/internals.texi for explanation of these macros.  */
  25 #define TARGET_FORMAT "elf64-mmix"
  26 #define TARGET_ARCH bfd_arch_mmix
  27 #define TARGET_BYTES_BIG_ENDIAN 1
  28
  29 extern const char mmix_comment_chars[];
  30 #define tc_comment_chars mmix_comment_chars
  31
  32 extern const char mmix_symbol_chars[];
  33 #define tc_symbol_chars mmix_symbol_chars
  34
  35 /* "@" is a synonym for ".".  */
  36 #define LEX_AT (LEX_BEGIN_NAME)
  37
  38 extern int mmix_label_without_colon_this_line (void);
  39 #define LABELS_WITHOUT_COLONS mmix_label_without_colon_this_line ()
  40
  41 extern int mmix_next_semicolon_is_eoln;
  42 #define TC_EOL_IN_INSN(p) (*(p) == ';' && ! mmix_next_semicolon_is_eoln)
  43
  44 /* This is one direction we can get mmixal compatibility.  */
  45 extern void mmix_handle_mmixal (void);
  46 #define md_start_line_hook mmix_handle_mmixal
  47
  48 extern void mmix_md_begin (void);
  49 #define md_begin mmix_md_begin
  50
  51 extern void mmix_md_end (void);
  52 #define md_end mmix_md_end
  53
  54 extern int mmix_current_location \
  55   (void (*fn) (expressionS *), expressionS *);
  56 extern int mmix_parse_predefined_name (char *, expressionS *);
  57
  58 extern char *mmix_current_prefix;
  59
  60 /* A bit ugly, since we "know" that there's a static function
  61    current_location that does what we want.  We also strip off a leading
  62    ':' in another ugly way.
  63
  64    The [DVWIOUZX]_Handler symbols are provided when-used.  */
  65
  66 extern int mmix_gnu_syntax;
  67 #define md_parse_name(name, exp, mode, cpos)                    \
  68  (! mmix_gnu_syntax                                             \
  69   && (name[0] == '@'                                            \
  70       ? (! is_part_of_name (name[1])                            \
  71          && mmix_current_location (current_location, exp))      \
  72       : ((name[0] == ':' || ISUPPER (name[0]))                  \
  73          && mmix_parse_predefined_name (name, exp))))
  74
  75 extern char *mmix_prefix_name (char *);
  76
  77 /* We implement when *creating* a symbol, we also need to strip a ':' or
  78    prepend a prefix.  */
  79 #define tc_canonicalize_symbol_name(x) \
  80  (mmix_current_prefix == NULL && (x)[0] != ':' ? (x) : mmix_prefix_name (x))
  81
  82 #define md_undefined_symbol(x) NULL
  83
  84 extern void mmix_fb_label (expressionS *);
  85
  86 /* Since integer_constant is local to expr.c, we have to make this a
  87    macro.  FIXME: Do it cleaner.  */
  88 #define md_operand(exp)                                                 \
  89   do                                                                    \
  90     {                                                                   \
  91       if (input_line_pointer[0] == '#')                                 \
  92         {                                                               \
  93           input_line_pointer++;                                         \
  94           integer_constant (16, (exp));                                 \
  95         }                                                               \
  96       else if (input_line_pointer[0] == '&'                             \
  97                && input_line_pointer[1] != '&')                         \
  98         as_bad (_("`&' serial number operator is not supported"));      \
  99       else                                                              \
 100         mmix_fb_label (exp);                                            \
 101     }                                                                   \
 102   while (0)
 103
 104 /* Gas dislikes the 2ADD, 8ADD etc. insns, so we have to assemble them in
 105    the error-recovery loop.  Hopefully there are no significant
 106    differences.  Also, space on a line isn't gracefully handled.  */
 107 extern int mmix_assemble_return_nonzero (char *);
 108 #define tc_unrecognized_line(c)                                         \
 109  ((c) == ' '                                                            \
 110   || (((c) == '1' || (c) == '2' || (c) == '4' || (c) == '8')            \
 111       && mmix_assemble_return_nonzero (input_line_pointer - 1)))
 112
 113 #define md_number_to_chars number_to_chars_bigendian
 114
 115 #define WORKING_DOT_WORD
 116
 117 extern const struct relax_type mmix_relax_table[];
 118 #define TC_GENERIC_RELAX_TABLE mmix_relax_table
 119
 120 /* We use the relax table for everything except the GREG frags and PUSHJ.  */
 121 extern long mmix_md_relax_frag (segT, fragS *, long);
 122 #define md_relax_frag mmix_md_relax_frag
 123
 124 #define tc_fix_adjustable(FIX)                                  \
 125  (((FIX)->fx_addsy == NULL                                      \
 126    || S_GET_SEGMENT ((FIX)->fx_addsy) != reg_section)           \
 127   && (FIX)->fx_r_type != BFD_RELOC_VTABLE_INHERIT               \
 128   && (FIX)->fx_r_type != BFD_RELOC_VTABLE_ENTRY                 \
 129   && (FIX)->fx_r_type != BFD_RELOC_MMIX_LOCAL)
 130
 131 /* Adjust symbols which are registers.  */
 132 #define tc_adjust_symtab() mmix_adjust_symtab ()
 133 extern void mmix_adjust_symtab (void);
 134
 135 /* Here's where we make all symbols global, when so requested.
 136    We must avoid doing that for expression symbols or section symbols,
 137    though.  */
 138 extern int mmix_globalize_symbols;
 139 #define tc_frob_symbol(sym, punt)                               \
 140   do                                                            \
 141     {                                                           \
 142       if (S_GET_SEGMENT (sym) == reg_section)                   \
 143         {                                                       \
 144           if (S_GET_NAME (sym)[0] != '$'                        \
 145               && S_GET_VALUE (sym) < 256)                       \
 146             {                                                   \
 147               if (mmix_globalize_symbols)                       \
 148                 S_SET_EXTERNAL (sym);                           \
 149               else                                              \
 150                 symbol_mark_used_in_reloc (sym);                \
 151             }                                                   \
 152         }                                                       \
 153       else if (mmix_globalize_symbols                           \
 154                && ! symbol_section_p (sym)                      \
 155                && sym != section_symbol (absolute_section)      \
 156                && ! S_IS_LOCAL (sym))                           \
 157         S_SET_EXTERNAL (sym);                                   \
 158     }                                                           \
 159   while (0)
 160
 161 /* No shared lib support, so we don't need to ensure externally
 162    visible symbols can be overridden.  */
 163 #define EXTERN_FORCE_RELOC 0
 164
 165 /* When relaxing, we need to emit various relocs we otherwise wouldn't.  */
 166 #define TC_FORCE_RELOCATION(fix) mmix_force_relocation (fix)
 167 extern int mmix_force_relocation (struct fix *);
 168
 169 /* Call md_pcrel_from_section(), not md_pcrel_from().  */
 170 #define MD_PCREL_FROM_SECTION(FIX, SEC) md_pcrel_from_section (FIX, SEC)
 171 extern long md_pcrel_from_section (struct fix *, segT);
 172
 173 #define md_section_align(seg, size) (size)
 174
 175 #define LISTING_HEADER "GAS for MMIX"
 176
 177 /* The default of 4 means Bcc expansion looks like it's missing a line.  */
 178 #define LISTING_LHS_CONT_LINES 5
 179
 180 extern fragS *mmix_opcode_frag;
 181 #define TC_FRAG_TYPE fragS *
 182 #define TC_FRAG_INIT(frag, max_bytes) (frag)->tc_frag_data = mmix_opcode_frag
 183
 184 /* We need to associate each section symbol with a list of GREGs defined
 185    for that section/segment and sorted on offset, between the point where
 186    all symbols have been evaluated and all frags mapped, and when the
 187    fixups are done and relocs are output.  Similarly for each unknown
 188    symbol.  */
 189 extern void mmix_frob_file (void);
 190 #define tc_frob_file_before_fix()                                       \
 191   do                                                                    \
 192     {                                                                   \
 193       int i = 0;                                                        \
 194                                                                         \
 195       /* It's likely mmix_frob_file changed (removed) sections, so make \
 196          sure sections are correctly numbered as per renumber_sections, \
 197          (static to write.c where this macro is called).  */            \
 198       mmix_frob_file ();                                                \
 199       bfd_map_over_sections (stdoutput, renumber_sections, &i);         \
 200     }                                                                   \
 201   while (0)
 202
 203 /* Used by mmix_frob_file.  Hangs on section symbols and unknown symbols.  */
 204 struct mmix_symbol_gregs;
 205 #define TC_SYMFIELD_TYPE struct mmix_symbol_gregs *
 206
 207 /* Used by relaxation, counting maximum needed PUSHJ stubs for a section.  */
 208 struct mmix_segment_info_type
 209  {
 210    /* We only need to keep track of the last stubbable frag because
 211       there's no less hackish way to keep track of different relaxation
 212       rounds.  */
 213    fragS *last_stubfrag;
 214    bfd_size_type nstubs;
 215  };
 216 #define TC_SEGMENT_INFO_TYPE struct mmix_segment_info_type
 217
 218 extern void mmix_md_elf_section_change_hook (void);
 219 #define md_elf_section_change_hook mmix_md_elf_section_change_hook
 220
 221 extern void mmix_md_do_align (int, char *, int, int);
 222 #define md_do_align(n, fill, len, max, label) \
 223  mmix_md_do_align (n, fill, len, max)
 224
 225 /* Each insn is a tetrabyte (4 bytes) long, but if there are BYTE
 226    sequences sprinkled in, we can get unaligned DWARF2 offsets, so let's
 227    explicitly say one byte.  */
 228 #define DWARF2_LINE_MIN_INSN_LENGTH 1
 229
 230 /* This target is buggy, and sets fix size too large.  */
 231 #define TC_FX_SIZE_SLACK(FIX) 6
 232
 233 /* MMIX has global register symbols.  */
 234 #define TC_GLOBAL_REGISTER_SYMBOL_OK