source: trunk/binutils/gas/config/tc-mmix.h@ 2562

Last change on this file since 2562 was 607, checked in by bird, 22 years ago

Initial revision
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File size: 7.4 KB
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1/* tc-mmix.h -- Header file for tc-mmix.c.
2 Copyright (C) 2001, 2002 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 2, 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, 59 Temple Place - Suite 330, Boston, MA
20 02111-1307, 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
29extern const char mmix_comment_chars[];
30#define tc_comment_chars mmix_comment_chars
31
32extern const char mmix_symbol_chars[];
33#define tc_symbol_chars mmix_symbol_chars
34
35extern const char mmix_exp_chars[];
36#define EXP_CHARS mmix_exp_chars
37
38extern 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
44extern int mmix_label_without_colon_this_line PARAMS ((void));
45#define LABELS_WITHOUT_COLONS mmix_label_without_colon_this_line ()
46
47extern 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. */
51extern void mmix_handle_mmixal PARAMS ((void));
52#define md_start_line_hook mmix_handle_mmixal
53
54extern void mmix_md_begin PARAMS ((void));
55#define md_begin mmix_md_begin
56
57extern void mmix_md_end PARAMS ((void));
58#define md_end mmix_md_end
59
60extern int mmix_current_location \
61 PARAMS ((void (*fn) (expressionS *), expressionS *));
62extern int mmix_parse_predefined_name PARAMS ((char *, expressionS *));
63
64extern 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
72extern int mmix_gnu_syntax;
73#define md_parse_name(name, exp, 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
81extern char *mmix_prefix_name PARAMS ((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
90extern void mmix_fb_label PARAMS ((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. */
113extern int mmix_assemble_return_nonzero PARAMS ((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
123extern 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. */
127extern long mmix_md_relax_frag PARAMS ((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 ()
139extern void mmix_adjust_symtab PARAMS ((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. */
144extern 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)
173extern int mmix_force_relocation PARAMS ((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)
177extern long md_pcrel_from_section PARAMS ((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
186extern 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. */
195extern void mmix_frob_file PARAMS ((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. */
199struct mmix_symbol_gregs;
200#define TC_SYMFIELD_TYPE struct mmix_symbol_gregs *
201
202extern void mmix_md_elf_section_change_hook PARAMS ((void));
203#define md_elf_section_change_hook mmix_md_elf_section_change_hook
204
205extern void mmix_md_do_align PARAMS ((int, char *, int, int));
206#define md_do_align(n, fill, len, max, label) \
207 mmix_md_do_align (n, fill, len, max)
208
209/* Each insn is a tetrabyte (4 bytes) long, but if there are BYTE
210 sequences sprinkled in, we can get unaligned DWARF2 offsets, so let's
211 explicitly say one byte. */
212#define DWARF2_LINE_MIN_INSN_LENGTH 1
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