1 /* tc-mmix.h -- Header file for tc-mmix.c. 2 Copyright (C) 2001-2014 Free Software Foundation, Inc. 3 Written by Hans-Peter Nilsson (hp (at) 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() \ 197 do \ 198 { \ 199 int i = 0; \ 200 \ 201 /* It's likely mmix_frob_file changed (removed) sections, so make \ 202 sure sections are correctly numbered as per renumber_sections, \ 203 (static to write.c where this macro is called). */ \ 204 mmix_frob_file (); \ 205 bfd_map_over_sections (stdoutput, renumber_sections, &i); \ 206 } \ 207 while (0) 208 209 /* Used by mmix_frob_file. Hangs on section symbols and unknown symbols. */ 210 struct mmix_symbol_gregs; 211 #define TC_SYMFIELD_TYPE struct mmix_symbol_gregs * 212 213 /* Used by relaxation, counting maximum needed PUSHJ stubs for a section. */ 214 struct mmix_segment_info_type 215 { 216 /* We only need to keep track of the last stubbable frag because 217 there's no less hackish way to keep track of different relaxation 218 rounds. */ 219 fragS *last_stubfrag; 220 bfd_size_type nstubs; 221 }; 222 #define TC_SEGMENT_INFO_TYPE struct mmix_segment_info_type 223 224 extern void mmix_md_elf_section_change_hook (void); 225 #define md_elf_section_change_hook mmix_md_elf_section_change_hook 226 227 extern void mmix_md_do_align (int, char *, int, int); 228 #define md_do_align(n, fill, len, max, label) \ 229 mmix_md_do_align (n, fill, len, max) 230 231 /* Each insn is a tetrabyte (4 bytes) long, but if there are BYTE 232 sequences sprinkled in, we can get unaligned DWARF2 offsets, so let's 233 explicitly say one byte. */ 234 #define DWARF2_LINE_MIN_INSN_LENGTH 1 235 236 /* This target is buggy, and sets fix size too large. */ 237 #define TC_FX_SIZE_SLACK(FIX) 6 238 239 /* MMIX has global register symbols. */ 240 #define TC_GLOBAL_REGISTER_SYMBOL_OK 241
