gas/config/tc-mmix.h

   1 /* tc-mmix.h -- Header file for tc-mmix.c.
   2    Copyright (C) 2001, 2002, 2003, 2005, 2007 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 extern const char mmix_exp_chars[];
  36 #define EXP_CHARS mmix_exp_chars
  37
  38 extern const char mmix_flt_chars[];
  39 #define FLT_CHARS mmix_flt_chars
  40
  41 /* "@" is a synonym for ".".  */
  42 #define LEX_AT (LEX_BEGIN_NAME)
  43
  44 extern int mmix_label_without_colon_this_line (void);
  45 #define LABELS_WITHOUT_COLONS mmix_label_without_colon_this_line ()
  46
  47 extern int mmix_next_semicolon_is_eoln;
  48 #define TC_EOL_IN_INSN(p) (*(p) == ';' && ! mmix_next_semicolon_is_eoln)
  49
  50 /* This is one direction we can get mmixal compatibility.  */
  51 extern void mmix_handle_mmixal (void);
  52 #define md_start_line_hook mmix_handle_mmixal
  53
  54 extern void mmix_md_begin (void);
  55 #define md_begin mmix_md_begin
  56
  57 extern void mmix_md_end (void);
  58 #define md_end mmix_md_end
  59
  60 extern int mmix_current_location \
  61   (void (*fn) (expressionS *), expressionS *);
  62 extern int mmix_parse_predefined_name (char *, expressionS *);
  63
  64 extern char *mmix_current_prefix;
  65
  66 /* A bit ugly, since we "know" that there's a static function
  67    current_location that does what we want.  We also strip off a leading
  68    ':' in another ugly way.
  69
  70    The [DVWIOUZX]_Handler symbols are provided when-used.  */
  71
  72 extern int mmix_gnu_syntax;
  73 #define md_parse_name(name, exp, mode, cpos)                    \
  74  (! mmix_gnu_syntax                                             \
  75   && (name[0] == '@'                                            \
  76       ? (! is_part_of_name (name[1])                            \
  77          && mmix_current_location (current_location, exp))      \
  78       : ((name[0] == ':' || ISUPPER (name[0]))                  \
  79          && mmix_parse_predefined_name (name, exp))))
  80
  81 extern char *mmix_prefix_name (char *);
  82
  83 /* We implement when *creating* a symbol, we also need to strip a ':' or
  84    prepend a prefix.  */
  85 #define tc_canonicalize_symbol_name(x) \
  86  (mmix_current_prefix == NULL && (x)[0] != ':' ? (x) : mmix_prefix_name (x))
  87
  88 #define md_undefined_symbol(x) NULL
  89
  90 extern void mmix_fb_label (expressionS *);
  91
  92 /* Since integer_constant is local to expr.c, we have to make this a
  93    macro.  FIXME: Do it cleaner.  */
  94 #define md_operand(exp)                                                 \
  95   do                                                                    \
  96     {                                                                   \
  97       if (input_line_pointer[0] == '#')                                 \
  98         {                                                               \
  99           input_line_pointer++;                                         \
 100           integer_constant (16, (exp));                                 \
 101         }                                                               \
 102       else if (input_line_pointer[0] == '&'                             \
 103                && input_line_pointer[1] != '&')                         \
 104         as_bad (_("`&' serial number operator is not supported"));      \
 105       else                                                              \
 106         mmix_fb_label (exp);                                            \
 107     }                                                                   \
 108   while (0)
 109
 110 /* Gas dislikes the 2ADD, 8ADD etc. insns, so we have to assemble them in
 111    the error-recovery loop.  Hopefully there are no significant
 112    differences.  Also, space on a line isn't gracefully handled.  */
 113 extern int mmix_assemble_return_nonzero (char *);
 114 #define tc_unrecognized_line(c)                                         \
 115  ((c) == ' '                                                            \
 116   || (((c) == '1' || (c) == '2' || (c) == '4' || (c) == '8')            \
 117       && mmix_assemble_return_nonzero (input_line_pointer - 1)))
 118
 119 #define md_number_to_chars number_to_chars_bigendian
 120
 121 #define WORKING_DOT_WORD
 122
 123 extern const struct relax_type mmix_relax_table[];
 124 #define TC_GENERIC_RELAX_TABLE mmix_relax_table
 125
 126 /* We use the relax table for everything except the GREG frags and PUSHJ.  */
 127 extern long mmix_md_relax_frag (segT, fragS *, long);
 128 #define md_relax_frag mmix_md_relax_frag
 129
 130 #define tc_fix_adjustable(FIX)                                  \
 131  (((FIX)->fx_addsy == NULL                                      \
 132    || S_GET_SEGMENT ((FIX)->fx_addsy) != reg_section)           \
 133   && (FIX)->fx_r_type != BFD_RELOC_VTABLE_INHERIT               \
 134   && (FIX)->fx_r_type != BFD_RELOC_VTABLE_ENTRY                 \
 135   && (FIX)->fx_r_type != BFD_RELOC_MMIX_LOCAL)
 136
 137 /* Adjust symbols which are registers.  */
 138 #define tc_adjust_symtab() mmix_adjust_symtab ()
 139 extern void mmix_adjust_symtab (void);
 140
 141 /* Here's where we make all symbols global, when so requested.
 142    We must avoid doing that for expression symbols or section symbols,
 143    though.  */
 144 extern int mmix_globalize_symbols;
 145 #define tc_frob_symbol(sym, punt)                               \
 146   do                                                            \
 147     {                                                           \
 148       if (S_GET_SEGMENT (sym) == reg_section)                   \
 149         {                                                       \
 150           if (S_GET_NAME (sym)[0] != '$'                        \
 151               && S_GET_VALUE (sym) < 256)                       \
 152             {                                                   \
 153               if (mmix_globalize_symbols)                       \
 154                 S_SET_EXTERNAL (sym);                           \
 155               else                                              \
 156                 symbol_mark_used_in_reloc (sym);                \
 157             }                                                   \
 158         }                                                       \
 159       else if (mmix_globalize_symbols                           \
 160                && ! symbol_section_p (sym)                      \
 161                && sym != section_symbol (absolute_section)      \
 162                && ! S_IS_LOCAL (sym))                           \
 163         S_SET_EXTERNAL (sym);                                   \
 164     }                                                           \
 165   while (0)
 166
 167 /* No shared lib support, so we don't need to ensure externally
 168    visible symbols can be overridden.  */
 169 #define EXTERN_FORCE_RELOC 0
 170
 171 /* When relaxing, we need to emit various relocs we otherwise wouldn't.  */
 172 #define TC_FORCE_RELOCATION(fix) mmix_force_relocation (fix)
 173 extern int mmix_force_relocation (struct fix *);
 174
 175 /* Call md_pcrel_from_section(), not md_pcrel_from().  */
 176 #define MD_PCREL_FROM_SECTION(FIX, SEC) md_pcrel_from_section (FIX, SEC)
 177 extern long md_pcrel_from_section (struct fix *, segT);
 178
 179 #define md_section_align(seg, size) (size)
 180
 181 #define LISTING_HEADER "GAS for MMIX"
 182
 183 /* The default of 4 means Bcc expansion looks like it's missing a line.  */
 184 #define LISTING_LHS_CONT_LINES 5
 185
 186 extern fragS *mmix_opcode_frag;
 187 #define TC_FRAG_TYPE fragS *
 188 #define TC_FRAG_INIT(frag) (frag)->tc_frag_data = mmix_opcode_frag
 189
 190 /* We need to associate each section symbol with a list of GREGs defined
 191    for that section/segment and sorted on offset, between the point where
 192    all symbols have been evaluated and all frags mapped, and when the
 193    fixups are done and relocs are output.  Similarly for each unknown
 194    symbol.  */
 195 extern void mmix_frob_file (void);
 196 #define tc_frob_file_before_fix mmix_frob_file
 197
 198 /* Used by mmix_frob_file.  Hangs on section symbols and unknown symbols.  */
 199 struct mmix_symbol_gregs;
 200 #define TC_SYMFIELD_TYPE struct mmix_symbol_gregs *
 201
 202 /* Used by relaxation, counting maximum needed PUSHJ stubs for a section.  */
 203 struct mmix_segment_info_type
 204  {
 205    /* We only need to keep track of the last stubbable frag because
 206       there's no less hackish way to keep track of different relaxation
 207       rounds.  */
 208    fragS *last_stubfrag;
 209    bfd_size_type nstubs;
 210  };
 211 #define TC_SEGMENT_INFO_TYPE struct mmix_segment_info_type
 212
 213 extern void mmix_md_elf_section_change_hook (void);
 214 #define md_elf_section_change_hook mmix_md_elf_section_change_hook
 215
 216 extern void mmix_md_do_align (int, char *, int, int);
 217 #define md_do_align(n, fill, len, max, label) \
 218  mmix_md_do_align (n, fill, len, max)
 219
 220 /* Each insn is a tetrabyte (4 bytes) long, but if there are BYTE
 221    sequences sprinkled in, we can get unaligned DWARF2 offsets, so let's
 222    explicitly say one byte.  */
 223 #define DWARF2_LINE_MIN_INSN_LENGTH 1
 224
 225 /* This target is buggy, and sets fix size too large.  */
 226 #define TC_FX_SIZE_SLACK(FIX) 6
 227
 228 /* MMIX has global register symbols.  */
 229 #define TC_GLOBAL_REGISTER_SYMBOL_OK