gas/config/tc-mmix.h

   1 /* tc-mmix.h -- Header file for tc-mmix.c.
   2    Copyright (C) 2001, 2002, 2003, 2005, 2007, 2008
   3    Free Software Foundation, Inc.
   4    Written by Hans-Peter Nilsson (hp@bitrange.com).
   5
   6    This file is part of GAS, the GNU Assembler.
   7
   8    GAS is free software; you can redistribute it and/or modify
   9    it under the terms of the GNU General Public License as published by
  10    the Free Software Foundation; either version 3, or (at your option)
  11    any later version.
  12
  13    GAS is distributed in the hope that it will be useful,
  14    but WITHOUT ANY WARRANTY; without even the implied warranty of
  15    MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  16    GNU General Public License for more details.
  17
  18    You should have received a copy of the GNU General Public License
  19    along with GAS; see the file COPYING.  If not, write to the Free
  20    Software Foundation, 51 Franklin Street - Fifth Floor, Boston, MA
  21    02110-1301, USA.  */
  22
  23 #define TC_MMIX
  24
  25 /* See gas/doc/internals.texi for explanation of these macros.  */
  26 #define TARGET_FORMAT "elf64-mmix"
  27 #define TARGET_ARCH bfd_arch_mmix
  28 #define TARGET_BYTES_BIG_ENDIAN 1
  29
  30 extern const char mmix_comment_chars[];
  31 #define tc_comment_chars mmix_comment_chars
  32
  33 extern const char mmix_symbol_chars[];
  34 #define tc_symbol_chars mmix_symbol_chars
  35
  36 extern const char mmix_exp_chars[];
  37 #define EXP_CHARS mmix_exp_chars
  38
  39 extern const char mmix_flt_chars[];
  40 #define FLT_CHARS mmix_flt_chars
  41
  42 /* "@" is a synonym for ".".  */
  43 #define LEX_AT (LEX_BEGIN_NAME)
  44
  45 extern int mmix_label_without_colon_this_line (void);
  46 #define LABELS_WITHOUT_COLONS mmix_label_without_colon_this_line ()
  47
  48 extern int mmix_next_semicolon_is_eoln;
  49 #define TC_EOL_IN_INSN(p) (*(p) == ';' && ! mmix_next_semicolon_is_eoln)
  50
  51 /* This is one direction we can get mmixal compatibility.  */
  52 extern void mmix_handle_mmixal (void);
  53 #define md_start_line_hook mmix_handle_mmixal
  54
  55 extern void mmix_md_begin (void);
  56 #define md_begin mmix_md_begin
  57
  58 extern void mmix_md_end (void);
  59 #define md_end mmix_md_end
  60
  61 extern int mmix_current_location \
  62   (void (*fn) (expressionS *), expressionS *);
  63 extern int mmix_parse_predefined_name (char *, expressionS *);
  64
  65 extern char *mmix_current_prefix;
  66
  67 /* A bit ugly, since we "know" that there's a static function
  68    current_location that does what we want.  We also strip off a leading
  69    ':' in another ugly way.
  70
  71    The [DVWIOUZX]_Handler symbols are provided when-used.  */
  72
  73 extern int mmix_gnu_syntax;
  74 #define md_parse_name(name, exp, mode, cpos)                    \
  75  (! mmix_gnu_syntax                                             \
  76   && (name[0] == '@'                                            \
  77       ? (! is_part_of_name (name[1])                            \
  78          && mmix_current_location (current_location, exp))      \
  79       : ((name[0] == ':' || ISUPPER (name[0]))                  \
  80          && mmix_parse_predefined_name (name, exp))))
  81
  82 extern char *mmix_prefix_name (char *);
  83
  84 /* We implement when *creating* a symbol, we also need to strip a ':' or
  85    prepend a prefix.  */
  86 #define tc_canonicalize_symbol_name(x) \
  87  (mmix_current_prefix == NULL && (x)[0] != ':' ? (x) : mmix_prefix_name (x))
  88
  89 #define md_undefined_symbol(x) NULL
  90
  91 extern void mmix_fb_label (expressionS *);
  92
  93 /* Since integer_constant is local to expr.c, we have to make this a
  94    macro.  FIXME: Do it cleaner.  */
  95 #define md_operand(exp)                                                 \
  96   do                                                                    \
  97     {                                                                   \
  98       if (input_line_pointer[0] == '#')                                 \
  99         {                                                               \
 100           input_line_pointer++;                                         \
 101           integer_constant (16, (exp));                                 \
 102         }                                                               \
 103       else if (input_line_pointer[0] == '&'                             \
 104                && input_line_pointer[1] != '&')                         \
 105         as_bad (_("`&' serial number operator is not supported"));      \
 106       else                                                              \
 107         mmix_fb_label (exp);                                            \
 108     }                                                                   \
 109   while (0)
 110
 111 /* Gas dislikes the 2ADD, 8ADD etc. insns, so we have to assemble them in
 112    the error-recovery loop.  Hopefully there are no significant
 113    differences.  Also, space on a line isn't gracefully handled.  */
 114 extern int mmix_assemble_return_nonzero (char *);
 115 #define tc_unrecognized_line(c)                                         \
 116  ((c) == ' '                                                            \
 117   || (((c) == '1' || (c) == '2' || (c) == '4' || (c) == '8')            \
 118       && mmix_assemble_return_nonzero (input_line_pointer - 1)))
 119
 120 #define md_number_to_chars number_to_chars_bigendian
 121
 122 #define WORKING_DOT_WORD
 123
 124 extern const struct relax_type mmix_relax_table[];
 125 #define TC_GENERIC_RELAX_TABLE mmix_relax_table
 126
 127 /* We use the relax table for everything except the GREG frags and PUSHJ.  */
 128 extern long mmix_md_relax_frag (segT, fragS *, long);
 129 #define md_relax_frag mmix_md_relax_frag
 130
 131 #define tc_fix_adjustable(FIX)                                  \
 132  (((FIX)->fx_addsy == NULL                                      \
 133    || S_GET_SEGMENT ((FIX)->fx_addsy) != reg_section)           \
 134   && (FIX)->fx_r_type != BFD_RELOC_VTABLE_INHERIT               \
 135   && (FIX)->fx_r_type != BFD_RELOC_VTABLE_ENTRY                 \
 136   && (FIX)->fx_r_type != BFD_RELOC_MMIX_LOCAL)
 137
 138 /* Adjust symbols which are registers.  */
 139 #define tc_adjust_symtab() mmix_adjust_symtab ()
 140 extern void mmix_adjust_symtab (void);
 141
 142 /* Here's where we make all symbols global, when so requested.
 143    We must avoid doing that for expression symbols or section symbols,
 144    though.  */
 145 extern int mmix_globalize_symbols;
 146 #define tc_frob_symbol(sym, punt)                               \
 147   do                                                            \
 148     {                                                           \
 149       if (S_GET_SEGMENT (sym) == reg_section)                   \
 150         {                                                       \
 151           if (S_GET_NAME (sym)[0] != '$'                        \
 152               && S_GET_VALUE (sym) < 256)                       \
 153             {                                                   \
 154               if (mmix_globalize_symbols)                       \
 155                 S_SET_EXTERNAL (sym);                           \
 156               else                                              \
 157                 symbol_mark_used_in_reloc (sym);                \
 158             }                                                   \
 159         }                                                       \
 160       else if (mmix_globalize_symbols                           \
 161                && ! symbol_section_p (sym)                      \
 162                && sym != section_symbol (absolute_section)      \
 163                && ! S_IS_LOCAL (sym))                           \
 164         S_SET_EXTERNAL (sym);                                   \
 165     }                                                           \
 166   while (0)
 167
 168 /* No shared lib support, so we don't need to ensure externally
 169    visible symbols can be overridden.  */
 170 #define EXTERN_FORCE_RELOC 0
 171
 172 /* When relaxing, we need to emit various relocs we otherwise wouldn't.  */
 173 #define TC_FORCE_RELOCATION(fix) mmix_force_relocation (fix)
 174 extern int mmix_force_relocation (struct fix *);
 175
 176 /* Call md_pcrel_from_section(), not md_pcrel_from().  */
 177 #define MD_PCREL_FROM_SECTION(FIX, SEC) md_pcrel_from_section (FIX, SEC)
 178 extern long md_pcrel_from_section (struct fix *, segT);
 179
 180 #define md_section_align(seg, size) (size)
 181
 182 #define LISTING_HEADER "GAS for MMIX"
 183
 184 /* The default of 4 means Bcc expansion looks like it's missing a line.  */
 185 #define LISTING_LHS_CONT_LINES 5
 186
 187 extern fragS *mmix_opcode_frag;
 188 #define TC_FRAG_TYPE fragS *
 189 #define TC_FRAG_INIT(frag) (frag)->tc_frag_data = mmix_opcode_frag
 190
 191 /* We need to associate each section symbol with a list of GREGs defined
 192    for that section/segment and sorted on offset, between the point where
 193    all symbols have been evaluated and all frags mapped, and when the
 194    fixups are done and relocs are output.  Similarly for each unknown
 195    symbol.  */
 196 extern void mmix_frob_file (void);
 197 #define tc_frob_file_before_fix mmix_frob_file
 198
 199 /* Used by mmix_frob_file.  Hangs on section symbols and unknown symbols.  */
 200 struct mmix_symbol_gregs;
 201 #define TC_SYMFIELD_TYPE struct mmix_symbol_gregs *
 202
 203 /* Used by relaxation, counting maximum needed PUSHJ stubs for a section.  */
 204 struct mmix_segment_info_type
 205  {
 206    /* We only need to keep track of the last stubbable frag because
 207       there's no less hackish way to keep track of different relaxation
 208       rounds.  */
 209    fragS *last_stubfrag;
 210    bfd_size_type nstubs;
 211  };
 212 #define TC_SEGMENT_INFO_TYPE struct mmix_segment_info_type
 213
 214 extern void mmix_md_elf_section_change_hook (void);
 215 #define md_elf_section_change_hook mmix_md_elf_section_change_hook
 216
 217 extern void mmix_md_do_align (int, char *, int, int);
 218 #define md_do_align(n, fill, len, max, label) \
 219  mmix_md_do_align (n, fill, len, max)
 220
 221 /* Each insn is a tetrabyte (4 bytes) long, but if there are BYTE
 222    sequences sprinkled in, we can get unaligned DWARF2 offsets, so let's
 223    explicitly say one byte.  */
 224 #define DWARF2_LINE_MIN_INSN_LENGTH 1
 225
 226 /* This target is buggy, and sets fix size too large.  */
 227 #define TC_FX_SIZE_SLACK(FIX) 6
 228
 229 /* MMIX has global register symbols.  */
 230 #define TC_GLOBAL_REGISTER_SYMBOL_OK