1 /* tc-mmix.h -- Header file for tc-mmix.c.
2 Copyright (C) 2001-2023 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_finish (void);
52 #define md_finish mmix_md_finish
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
172 #define md_section_align(seg, size) (size)
173
174 #define LISTING_HEADER "GAS for MMIX"
175
176 /* The default of 4 means Bcc expansion looks like it's missing a line. */
177 #define LISTING_LHS_CONT_LINES 5
178
179 extern fragS *mmix_opcode_frag;
180 #define TC_FRAG_TYPE fragS *
181 #define TC_FRAG_INIT(frag, max_bytes) (frag)->tc_frag_data = mmix_opcode_frag
182
183 /* We need to associate each section symbol with a list of GREGs defined
184 for that section/segment and sorted on offset, between the point where
185 all symbols have been evaluated and all frags mapped, and when the
186 fixups are done and relocs are output. Similarly for each unknown
187 symbol. */
188 extern void mmix_frob_file (void);
189 #define tc_frob_file_before_fix() \
190 do \
191 { \
192 int i = 0; \
193 \
194 /* It's likely mmix_frob_file changed (removed) sections, so make \
195 sure sections are correctly numbered as per renumber_sections, \
196 (static to write.c where this macro is called). */ \
197 mmix_frob_file (); \
198 bfd_map_over_sections (stdoutput, renumber_sections, &i); \
199 } \
200 while (0)
201
202 /* Used by mmix_frob_file. Hangs on section symbols and unknown symbols. */
203 struct mmix_symbol_gregs;
204 #define TC_SYMFIELD_TYPE struct mmix_symbol_gregs *
205
206 /* Used by relaxation, counting maximum needed PUSHJ stubs for a section. */
207 struct mmix_segment_info_type
208 {
209 /* We only need to keep track of the last stubbable frag because
210 there's no less hackish way to keep track of different relaxation
211 rounds. */
212 fragS *last_stubfrag;
213 bfd_size_type nstubs;
214 };
215 #define TC_SEGMENT_INFO_TYPE struct mmix_segment_info_type
216
217 extern void mmix_md_elf_section_change_hook (void);
218 #define md_elf_section_change_hook mmix_md_elf_section_change_hook
219
220 extern void mmix_md_do_align (int, char *, int, int);
221 #define md_do_align(n, fill, len, max, label) \
222 mmix_md_do_align (n, fill, len, max)
223
224 /* Each insn is a tetrabyte (4 bytes) long, but if there are BYTE
225 sequences sprinkled in, we can get unaligned DWARF2 offsets, so let's
226 explicitly say one byte. */
227 #define DWARF2_LINE_MIN_INSN_LENGTH 1
228
229 /* MMIX has global register symbols. */
230 #define TC_GLOBAL_REGISTER_SYMBOL_OK
231
232 #define md_single_noop_insn "swym 0"