Commit | Line | Data |
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3c3bdf30 | 1 | /* tc-mmix.c -- Assembler for Don Knuth's MMIX. |
87975d2a | 2 | Copyright (C) 2001, 2002, 2003, 2004, 2005, 2006, 2007, 2008, 2009, 2010 |
ebd1c875 | 3 | Free Software Foundation. |
3c3bdf30 NC |
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 | |
ec2655a6 | 9 | the Free Software Foundation; either version 3, or (at your option) |
3c3bdf30 NC |
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 | |
4b4da160 NC |
19 | the Free Software Foundation, 51 Franklin Street - Fifth Floor, |
20 | Boston, MA 02110-1301, USA. */ | |
3c3bdf30 NC |
21 | |
22 | /* Knuth's assembler mmixal does not provide a relocatable format; mmo is | |
23 | to be considered a final link-format. In the final link, we make mmo, | |
24 | but for relocatable files, we use ELF. | |
25 | ||
26 | One goal is to provide a superset of what mmixal does, including | |
27 | compatible syntax, but the main purpose is to serve GCC. */ | |
28 | ||
29 | ||
88fc725d | 30 | #include <limits.h> |
3c3bdf30 NC |
31 | #include "as.h" |
32 | #include "subsegs.h" | |
3c3bdf30 NC |
33 | #include "elf/mmix.h" |
34 | #include "opcode/mmix.h" | |
35 | #include "safe-ctype.h" | |
36 | #include "dwarf2dbg.h" | |
37 | #include "obstack.h" | |
38 | ||
39 | /* Something to describe what we need to do with a fixup before output, | |
40 | for example assert something of what it became or make a relocation. */ | |
41 | ||
42 | enum mmix_fixup_action | |
43 | { | |
44 | mmix_fixup_byte, | |
45 | mmix_fixup_register, | |
46 | mmix_fixup_register_or_adjust_for_byte | |
47 | }; | |
48 | ||
ff1e783f HPN |
49 | static int get_spec_regno (char *); |
50 | static int get_operands (int, char *, expressionS *); | |
51 | static int get_putget_operands (struct mmix_opcode *, char *, expressionS *); | |
52 | static void s_prefix (int); | |
53 | static void s_greg (int); | |
54 | static void s_loc (int); | |
55 | static void s_bspec (int); | |
56 | static void s_espec (int); | |
57 | static void mmix_s_local (int); | |
58 | static void mmix_greg_internal (char *); | |
59 | static void mmix_set_geta_branch_offset (char *, offsetT); | |
60 | static void mmix_set_jmp_offset (char *, offsetT); | |
61 | static void mmix_fill_nops (char *, int); | |
62 | static int cmp_greg_symbol_fixes (const void *, const void *); | |
63 | static int cmp_greg_val_greg_symbol_fixes (const void *, const void *); | |
64 | static void mmix_handle_rest_of_empty_line (void); | |
65 | static void mmix_discard_rest_of_line (void); | |
66 | static void mmix_byte (void); | |
67 | static void mmix_cons (int); | |
3c3bdf30 NC |
68 | |
69 | /* Continue the tradition of symbols.c; use control characters to enforce | |
70 | magic. These are used when replacing e.g. 8F and 8B so we can handle | |
71 | such labels correctly with the common parser hooks. */ | |
72 | #define MAGIC_FB_BACKWARD_CHAR '\003' | |
73 | #define MAGIC_FB_FORWARD_CHAR '\004' | |
74 | ||
75 | /* Copy the location of a frag to a fix. */ | |
76 | #define COPY_FR_WHERE_TO_FX(FRAG, FIX) \ | |
77 | do \ | |
78 | { \ | |
79 | (FIX)->fx_file = (FRAG)->fr_file; \ | |
80 | (FIX)->fx_line = (FRAG)->fr_line; \ | |
81 | } \ | |
82 | while (0) | |
83 | ||
84 | const char *md_shortopts = "x"; | |
85 | static int current_fb_label = -1; | |
86 | static char *pending_label = NULL; | |
87 | ||
88 | static bfd_vma lowest_text_loc = (bfd_vma) -1; | |
89 | static int text_has_contents = 0; | |
90 | ||
91 | /* The alignment of the previous instruction, and a boolean for whether we | |
92 | want to avoid aligning the next WYDE, TETRA, OCTA or insn. */ | |
93 | static int last_alignment = 0; | |
94 | static int want_unaligned = 0; | |
95 | ||
96 | static bfd_vma lowest_data_loc = (bfd_vma) -1; | |
97 | static int data_has_contents = 0; | |
98 | ||
99 | /* The fragS of the instruction being assembled. Only valid from within | |
100 | md_assemble. */ | |
101 | fragS *mmix_opcode_frag = NULL; | |
102 | ||
103 | /* Raw GREGs as appearing in input. These may be fewer than the number | |
104 | after relaxing. */ | |
105 | static int n_of_raw_gregs = 0; | |
106 | static struct | |
107 | { | |
108 | char *label; | |
109 | expressionS exp; | |
110 | } mmix_raw_gregs[MAX_GREGS]; | |
111 | ||
112 | /* Fixups for all unique GREG registers. We store the fixups here in | |
113 | md_convert_frag, then we use the array to convert | |
114 | BFD_RELOC_MMIX_BASE_PLUS_OFFSET fixups in tc_gen_reloc. The index is | |
115 | just a running number and is not supposed to be correlated to a | |
116 | register number. */ | |
117 | static fixS *mmix_gregs[MAX_GREGS]; | |
118 | static int n_of_cooked_gregs = 0; | |
119 | ||
120 | /* Pointing to the register section we use for output. */ | |
121 | static asection *real_reg_section; | |
122 | ||
123 | /* For each symbol; unknown or section symbol, we keep a list of GREG | |
124 | definitions sorted on increasing offset. It seems no use keeping count | |
125 | to allocate less room than the maximum number of gregs when we've found | |
126 | one for a section or symbol. */ | |
127 | struct mmix_symbol_gregs | |
128 | { | |
129 | int n_gregs; | |
130 | struct mmix_symbol_greg_fixes | |
131 | { | |
132 | fixS *fix; | |
133 | ||
134 | /* A signed type, since we may have GREGs pointing slightly before the | |
135 | contents of a section. */ | |
136 | offsetT offs; | |
137 | } greg_fixes[MAX_GREGS]; | |
138 | }; | |
139 | ||
140 | /* Should read insert a colon on something that starts in column 0 on | |
141 | this line? */ | |
142 | static int label_without_colon_this_line = 1; | |
143 | ||
88fc725d HPN |
144 | /* Should we automatically expand instructions into multiple insns in |
145 | order to generate working code? */ | |
3c3bdf30 NC |
146 | static int expand_op = 1; |
147 | ||
148 | /* Should we warn when expanding operands? FIXME: test-cases for when -x | |
149 | is absent. */ | |
150 | static int warn_on_expansion = 1; | |
151 | ||
152 | /* Should we merge non-zero GREG register definitions? */ | |
153 | static int merge_gregs = 1; | |
154 | ||
973eb340 HPN |
155 | /* Should we pass on undefined BFD_RELOC_MMIX_BASE_PLUS_OFFSET relocs |
156 | (missing suitable GREG definitions) to the linker? */ | |
157 | static int allocate_undefined_gregs_in_linker = 0; | |
158 | ||
3c3bdf30 NC |
159 | /* Should we emit built-in symbols? */ |
160 | static int predefined_syms = 1; | |
161 | ||
973eb340 HPN |
162 | /* Should we allow anything but the listed special register name |
163 | (e.g. equated symbols)? */ | |
3c3bdf30 NC |
164 | static int equated_spec_regs = 1; |
165 | ||
166 | /* Do we require standard GNU syntax? */ | |
167 | int mmix_gnu_syntax = 0; | |
168 | ||
169 | /* Do we globalize all symbols? */ | |
170 | int mmix_globalize_symbols = 0; | |
171 | ||
88fc725d HPN |
172 | /* When expanding insns, do we want to expand PUSHJ as a call to a stub |
173 | (or else as a series of insns)? */ | |
174 | int pushj_stubs = 1; | |
175 | ||
3c3bdf30 | 176 | /* Do we know that the next semicolon is at the end of the operands field |
88fc725d | 177 | (in mmixal mode; constant 1 in GNU mode)? */ |
3c3bdf30 NC |
178 | int mmix_next_semicolon_is_eoln = 1; |
179 | ||
180 | /* Do we have a BSPEC in progress? */ | |
181 | static int doing_bspec = 0; | |
182 | static char *bspec_file; | |
183 | static unsigned int bspec_line; | |
184 | ||
185 | struct option md_longopts[] = | |
186 | { | |
187 | #define OPTION_RELAX (OPTION_MD_BASE) | |
188 | #define OPTION_NOEXPAND (OPTION_RELAX + 1) | |
189 | #define OPTION_NOMERGEGREG (OPTION_NOEXPAND + 1) | |
190 | #define OPTION_NOSYMS (OPTION_NOMERGEGREG + 1) | |
191 | #define OPTION_GNU_SYNTAX (OPTION_NOSYMS + 1) | |
192 | #define OPTION_GLOBALIZE_SYMBOLS (OPTION_GNU_SYNTAX + 1) | |
193 | #define OPTION_FIXED_SPEC_REGS (OPTION_GLOBALIZE_SYMBOLS + 1) | |
973eb340 | 194 | #define OPTION_LINKER_ALLOCATED_GREGS (OPTION_FIXED_SPEC_REGS + 1) |
88fc725d | 195 | #define OPTION_NOPUSHJSTUBS (OPTION_LINKER_ALLOCATED_GREGS + 1) |
3c3bdf30 NC |
196 | {"linkrelax", no_argument, NULL, OPTION_RELAX}, |
197 | {"no-expand", no_argument, NULL, OPTION_NOEXPAND}, | |
198 | {"no-merge-gregs", no_argument, NULL, OPTION_NOMERGEGREG}, | |
199 | {"no-predefined-syms", no_argument, NULL, OPTION_NOSYMS}, | |
200 | {"gnu-syntax", no_argument, NULL, OPTION_GNU_SYNTAX}, | |
201 | {"globalize-symbols", no_argument, NULL, OPTION_GLOBALIZE_SYMBOLS}, | |
202 | {"fixed-special-register-names", no_argument, NULL, | |
203 | OPTION_FIXED_SPEC_REGS}, | |
973eb340 HPN |
204 | {"linker-allocated-gregs", no_argument, NULL, |
205 | OPTION_LINKER_ALLOCATED_GREGS}, | |
88fc725d HPN |
206 | {"no-pushj-stubs", no_argument, NULL, OPTION_NOPUSHJSTUBS}, |
207 | {"no-stubs", no_argument, NULL, OPTION_NOPUSHJSTUBS}, | |
3c3bdf30 NC |
208 | {NULL, no_argument, NULL, 0} |
209 | }; | |
210 | ||
211 | size_t md_longopts_size = sizeof (md_longopts); | |
212 | ||
213 | static struct hash_control *mmix_opcode_hash; | |
214 | ||
215 | /* We use these when implementing the PREFIX pseudo. */ | |
216 | char *mmix_current_prefix; | |
217 | struct obstack mmix_sym_obstack; | |
218 | ||
219 | ||
220 | /* For MMIX, we encode the relax_substateT:s (in e.g. fr_substate) as one | |
221 | bit length, and the relax-type shifted on top of that. There seems to | |
222 | be no point in making the relaxation more fine-grained; the linker does | |
223 | that better and we might interfere by changing non-optimal relaxations | |
224 | into other insns that cannot be relaxed as easily. | |
225 | ||
226 | Groups for MMIX relaxing: | |
227 | ||
228 | 1. GETA | |
229 | extra length: zero or three insns. | |
230 | ||
231 | 2. Bcc | |
232 | extra length: zero or five insns. | |
233 | ||
234 | 3. PUSHJ | |
235 | extra length: zero or four insns. | |
88fc725d | 236 | Special handling to deal with transition to PUSHJSTUB. |
3c3bdf30 NC |
237 | |
238 | 4. JMP | |
88fc725d HPN |
239 | extra length: zero or four insns. |
240 | ||
241 | 5. GREG | |
242 | special handling, allocates a named global register unless another | |
243 | is within reach for all uses. | |
244 | ||
245 | 6. PUSHJSTUB | |
246 | special handling (mostly) for external references; assumes the | |
247 | linker will generate a stub if target is no longer than 256k from | |
248 | the end of the section plus max size of previous stubs. Zero or | |
249 | four insns. */ | |
3c3bdf30 NC |
250 | |
251 | #define STATE_GETA (1) | |
252 | #define STATE_BCC (2) | |
253 | #define STATE_PUSHJ (3) | |
254 | #define STATE_JMP (4) | |
255 | #define STATE_GREG (5) | |
88fc725d | 256 | #define STATE_PUSHJSTUB (6) |
3c3bdf30 NC |
257 | |
258 | /* No fine-grainedness here. */ | |
259 | #define STATE_LENGTH_MASK (1) | |
260 | ||
261 | #define STATE_ZERO (0) | |
262 | #define STATE_MAX (1) | |
263 | ||
264 | /* More descriptive name for convenience. */ | |
265 | /* FIXME: We should start on something different, not MAX. */ | |
266 | #define STATE_UNDF STATE_MAX | |
267 | ||
268 | /* FIXME: For GREG, we must have other definitions; UNDF == MAX isn't | |
269 | appropriate; we need it the other way round. This value together with | |
270 | fragP->tc_frag_data shows what state the frag is in: tc_frag_data | |
271 | non-NULL means 0, NULL means 8 bytes. */ | |
272 | #define STATE_GREG_UNDF ENCODE_RELAX (STATE_GREG, STATE_ZERO) | |
273 | #define STATE_GREG_DEF ENCODE_RELAX (STATE_GREG, STATE_MAX) | |
274 | ||
67c1ffbe | 275 | /* These displacements are relative to the address following the opcode |
3c3bdf30 NC |
276 | word of the instruction. The catch-all states have zero for "reach" |
277 | and "next" entries. */ | |
278 | ||
279 | #define GETA_0F (65536 * 4 - 8) | |
280 | #define GETA_0B (-65536 * 4 - 4) | |
281 | ||
a1b6236b | 282 | #define GETA_MAX_LEN 4 * 4 |
3c3bdf30 NC |
283 | #define GETA_3F 0 |
284 | #define GETA_3B 0 | |
285 | ||
286 | #define BCC_0F GETA_0F | |
287 | #define BCC_0B GETA_0B | |
288 | ||
a1b6236b | 289 | #define BCC_MAX_LEN 6 * 4 |
3c3bdf30 NC |
290 | #define BCC_5F GETA_3F |
291 | #define BCC_5B GETA_3B | |
292 | ||
293 | #define PUSHJ_0F GETA_0F | |
294 | #define PUSHJ_0B GETA_0B | |
295 | ||
a1b6236b | 296 | #define PUSHJ_MAX_LEN 5 * 4 |
3c3bdf30 NC |
297 | #define PUSHJ_4F GETA_3F |
298 | #define PUSHJ_4B GETA_3B | |
299 | ||
88fc725d | 300 | /* We'll very rarely have sections longer than LONG_MAX, but we'll make a |
f17c130b AM |
301 | feeble attempt at getting 64-bit values. */ |
302 | #define PUSHJSTUB_MAX ((offsetT) (((addressT) -1) >> 1)) | |
303 | #define PUSHJSTUB_MIN (-PUSHJSTUB_MAX - 1) | |
88fc725d | 304 | |
3c3bdf30 NC |
305 | #define JMP_0F (65536 * 256 * 4 - 8) |
306 | #define JMP_0B (-65536 * 256 * 4 - 4) | |
307 | ||
a1b6236b | 308 | #define JMP_MAX_LEN 5 * 4 |
3c3bdf30 NC |
309 | #define JMP_4F 0 |
310 | #define JMP_4B 0 | |
311 | ||
312 | #define RELAX_ENCODE_SHIFT 1 | |
313 | #define ENCODE_RELAX(what, length) (((what) << RELAX_ENCODE_SHIFT) + (length)) | |
314 | ||
315 | const relax_typeS mmix_relax_table[] = | |
316 | { | |
317 | /* Error sentinel (0, 0). */ | |
318 | {1, 1, 0, 0}, | |
319 | ||
320 | /* Unused (0, 1). */ | |
321 | {1, 1, 0, 0}, | |
322 | ||
323 | /* GETA (1, 0). */ | |
324 | {GETA_0F, GETA_0B, 0, ENCODE_RELAX (STATE_GETA, STATE_MAX)}, | |
325 | ||
326 | /* GETA (1, 1). */ | |
327 | {GETA_3F, GETA_3B, | |
328 | GETA_MAX_LEN - 4, 0}, | |
329 | ||
330 | /* BCC (2, 0). */ | |
331 | {BCC_0F, BCC_0B, 0, ENCODE_RELAX (STATE_BCC, STATE_MAX)}, | |
332 | ||
333 | /* BCC (2, 1). */ | |
334 | {BCC_5F, BCC_5B, | |
335 | BCC_MAX_LEN - 4, 0}, | |
336 | ||
88fc725d HPN |
337 | /* PUSHJ (3, 0). Next state is actually PUSHJSTUB (6, 0). */ |
338 | {PUSHJ_0F, PUSHJ_0B, 0, ENCODE_RELAX (STATE_PUSHJSTUB, STATE_ZERO)}, | |
3c3bdf30 NC |
339 | |
340 | /* PUSHJ (3, 1). */ | |
341 | {PUSHJ_4F, PUSHJ_4B, | |
342 | PUSHJ_MAX_LEN - 4, 0}, | |
343 | ||
344 | /* JMP (4, 0). */ | |
345 | {JMP_0F, JMP_0B, 0, ENCODE_RELAX (STATE_JMP, STATE_MAX)}, | |
346 | ||
347 | /* JMP (4, 1). */ | |
348 | {JMP_4F, JMP_4B, | |
349 | JMP_MAX_LEN - 4, 0}, | |
350 | ||
351 | /* GREG (5, 0), (5, 1), though the table entry isn't used. */ | |
88fc725d HPN |
352 | {0, 0, 0, 0}, {0, 0, 0, 0}, |
353 | ||
354 | /* PUSHJSTUB (6, 0). PUSHJ (3, 0) uses the range, so we set it to infinite. */ | |
355 | {PUSHJSTUB_MAX, PUSHJSTUB_MIN, | |
356 | 0, ENCODE_RELAX (STATE_PUSHJ, STATE_MAX)}, | |
357 | /* PUSHJSTUB (6, 1) isn't used. */ | |
358 | {0, 0, PUSHJ_MAX_LEN, 0} | |
3c3bdf30 NC |
359 | }; |
360 | ||
361 | const pseudo_typeS md_pseudo_table[] = | |
362 | { | |
363 | /* Support " .greg sym,expr" syntax. */ | |
364 | {"greg", s_greg, 0}, | |
365 | ||
366 | /* Support " .bspec expr" syntax. */ | |
367 | {"bspec", s_bspec, 1}, | |
368 | ||
369 | /* Support " .espec" syntax. */ | |
370 | {"espec", s_espec, 1}, | |
371 | ||
372 | /* Support " .local $45" syntax. */ | |
373 | {"local", mmix_s_local, 1}, | |
374 | ||
3c3bdf30 NC |
375 | {NULL, 0, 0} |
376 | }; | |
377 | ||
378 | const char mmix_comment_chars[] = "%!"; | |
379 | ||
380 | /* A ':' is a valid symbol character in mmixal. It's the prefix | |
381 | delimiter, but other than that, it works like a symbol character, | |
382 | except that we strip one off at the beginning of symbols. An '@' is a | |
383 | symbol by itself (for the current location); space around it must not | |
384 | be stripped. */ | |
385 | const char mmix_symbol_chars[] = ":@"; | |
386 | ||
387 | const char line_comment_chars[] = "*#"; | |
388 | ||
389 | const char line_separator_chars[] = ";"; | |
390 | ||
391 | const char mmix_exp_chars[] = "eE"; | |
392 | ||
393 | const char mmix_flt_chars[] = "rf"; | |
394 | ||
395 | ||
396 | /* Fill in the offset-related part of GETA or Bcc. */ | |
397 | ||
398 | static void | |
ff1e783f | 399 | mmix_set_geta_branch_offset (char *opcodep, offsetT value) |
3c3bdf30 NC |
400 | { |
401 | if (value < 0) | |
402 | { | |
403 | value += 65536 * 4; | |
404 | opcodep[0] |= 1; | |
405 | } | |
406 | ||
407 | value /= 4; | |
408 | md_number_to_chars (opcodep + 2, value, 2); | |
409 | } | |
410 | ||
411 | /* Fill in the offset-related part of JMP. */ | |
412 | ||
413 | static void | |
ff1e783f | 414 | mmix_set_jmp_offset (char *opcodep, offsetT value) |
3c3bdf30 NC |
415 | { |
416 | if (value < 0) | |
417 | { | |
418 | value += 65536 * 256 * 4; | |
419 | opcodep[0] |= 1; | |
420 | } | |
421 | ||
422 | value /= 4; | |
423 | md_number_to_chars (opcodep + 1, value, 3); | |
424 | } | |
425 | ||
426 | /* Fill in NOP:s for the expanded part of GETA/JMP/Bcc/PUSHJ. */ | |
427 | ||
428 | static void | |
ff1e783f | 429 | mmix_fill_nops (char *opcodep, int n) |
3c3bdf30 NC |
430 | { |
431 | int i; | |
432 | ||
433 | for (i = 0; i < n; i++) | |
a1b6236b | 434 | md_number_to_chars (opcodep + i * 4, SWYM_INSN_BYTE << 24, 4); |
3c3bdf30 NC |
435 | } |
436 | ||
437 | /* See macro md_parse_name in tc-mmix.h. */ | |
438 | ||
439 | int | |
ff1e783f | 440 | mmix_current_location (void (*fn) (expressionS *), expressionS *exp) |
3c3bdf30 NC |
441 | { |
442 | (*fn) (exp); | |
443 | ||
444 | return 1; | |
445 | } | |
446 | ||
447 | /* Get up to three operands, filling them into the exp array. | |
448 | General idea and code stolen from the tic80 port. */ | |
449 | ||
450 | static int | |
ff1e783f | 451 | get_operands (int max_operands, char *s, expressionS *exp) |
3c3bdf30 NC |
452 | { |
453 | char *p = s; | |
454 | int numexp = 0; | |
455 | int nextchar = ','; | |
456 | ||
457 | while (nextchar == ',') | |
458 | { | |
459 | /* Skip leading whitespace */ | |
460 | while (*p == ' ' || *p == '\t') | |
461 | p++; | |
462 | ||
463 | /* Check to see if we have any operands left to parse */ | |
464 | if (*p == 0 || *p == '\n' || *p == '\r') | |
465 | { | |
466 | break; | |
467 | } | |
468 | else if (numexp == max_operands) | |
469 | { | |
470 | /* This seems more sane than saying "too many operands". We'll | |
471 | get here only if the trailing trash starts with a comma. */ | |
472 | as_bad (_("invalid operands")); | |
473 | mmix_discard_rest_of_line (); | |
474 | return 0; | |
475 | } | |
476 | ||
a1b6236b | 477 | /* Begin operand parsing at the current scan point. */ |
3c3bdf30 NC |
478 | |
479 | input_line_pointer = p; | |
480 | expression (&exp[numexp]); | |
481 | ||
482 | if (exp[numexp].X_op == O_illegal) | |
483 | { | |
484 | as_bad (_("invalid operands")); | |
485 | } | |
486 | else if (exp[numexp].X_op == O_absent) | |
487 | { | |
488 | as_bad (_("missing operand")); | |
489 | } | |
490 | ||
491 | numexp++; | |
492 | p = input_line_pointer; | |
493 | ||
494 | /* Skip leading whitespace */ | |
495 | while (*p == ' ' || *p == '\t') | |
496 | p++; | |
497 | nextchar = *p++; | |
498 | } | |
499 | ||
500 | /* If we allow "naked" comments, ignore the rest of the line. */ | |
501 | if (nextchar != ',') | |
502 | { | |
503 | mmix_handle_rest_of_empty_line (); | |
504 | input_line_pointer--; | |
505 | } | |
506 | ||
a1b6236b | 507 | /* Mark the end of the valid operands with an illegal expression. */ |
3c3bdf30 NC |
508 | exp[numexp].X_op = O_illegal; |
509 | ||
510 | return (numexp); | |
511 | } | |
512 | ||
513 | /* Get the value of a special register, or -1 if the name does not match | |
514 | one. NAME is a null-terminated string. */ | |
515 | ||
516 | static int | |
ff1e783f | 517 | get_spec_regno (char *name) |
3c3bdf30 NC |
518 | { |
519 | int i; | |
520 | ||
521 | if (name == NULL) | |
522 | return -1; | |
523 | ||
524 | if (*name == ':') | |
525 | name++; | |
526 | ||
527 | /* Well, it's a short array and we'll most often just match the first | |
528 | entry, rJ. */ | |
529 | for (i = 0; mmix_spec_regs[i].name != NULL; i++) | |
530 | if (strcmp (name, mmix_spec_regs[i].name) == 0) | |
531 | return mmix_spec_regs[i].number; | |
532 | ||
533 | return -1; | |
534 | } | |
535 | ||
536 | /* For GET and PUT, parse the register names "manually", so we don't use | |
537 | user labels. */ | |
538 | static int | |
ff1e783f HPN |
539 | get_putget_operands (struct mmix_opcode *insn, char *operands, |
540 | expressionS *exp) | |
3c3bdf30 NC |
541 | { |
542 | expressionS *expp_reg; | |
543 | expressionS *expp_sreg; | |
544 | char *sregp = NULL; | |
545 | char *sregend = operands; | |
546 | char *p = operands; | |
547 | char c = *sregend; | |
548 | int regno; | |
549 | ||
550 | /* Skip leading whitespace */ | |
551 | while (*p == ' ' || *p == '\t') | |
552 | p++; | |
553 | ||
554 | input_line_pointer = p; | |
555 | ||
480c8d94 HPN |
556 | /* Initialize both possible operands to error state, in case we never |
557 | get further. */ | |
558 | exp[0].X_op = O_illegal; | |
559 | exp[1].X_op = O_illegal; | |
560 | ||
3c3bdf30 NC |
561 | if (insn->operands == mmix_operands_get) |
562 | { | |
563 | expp_reg = &exp[0]; | |
564 | expp_sreg = &exp[1]; | |
565 | ||
566 | expression (expp_reg); | |
567 | ||
568 | p = input_line_pointer; | |
569 | ||
570 | /* Skip whitespace */ | |
571 | while (*p == ' ' || *p == '\t') | |
572 | p++; | |
573 | ||
574 | if (*p == ',') | |
575 | { | |
576 | p++; | |
577 | ||
578 | /* Skip whitespace */ | |
579 | while (*p == ' ' || *p == '\t') | |
580 | p++; | |
581 | sregp = p; | |
582 | input_line_pointer = sregp; | |
583 | c = get_symbol_end (); | |
584 | sregend = input_line_pointer; | |
585 | } | |
586 | } | |
587 | else | |
588 | { | |
589 | expp_sreg = &exp[0]; | |
590 | expp_reg = &exp[1]; | |
591 | ||
3c3bdf30 NC |
592 | sregp = p; |
593 | c = get_symbol_end (); | |
594 | sregend = p = input_line_pointer; | |
595 | *p = c; | |
596 | ||
597 | /* Skip whitespace */ | |
598 | while (*p == ' ' || *p == '\t') | |
599 | p++; | |
600 | ||
601 | if (*p == ',') | |
602 | { | |
603 | p++; | |
604 | ||
605 | /* Skip whitespace */ | |
606 | while (*p == ' ' || *p == '\t') | |
607 | p++; | |
608 | ||
609 | input_line_pointer = p; | |
610 | expression (expp_reg); | |
611 | } | |
612 | *sregend = 0; | |
613 | } | |
614 | ||
615 | regno = get_spec_regno (sregp); | |
616 | *sregend = c; | |
617 | ||
618 | /* Let the caller issue errors; we've made sure the operands are | |
619 | invalid. */ | |
620 | if (expp_reg->X_op != O_illegal | |
621 | && expp_reg->X_op != O_absent | |
622 | && regno != -1) | |
623 | { | |
624 | expp_sreg->X_op = O_register; | |
625 | expp_sreg->X_add_number = regno + 256; | |
626 | } | |
627 | ||
628 | return 2; | |
629 | } | |
630 | ||
631 | /* Handle MMIX-specific option. */ | |
632 | ||
633 | int | |
ff1e783f | 634 | md_parse_option (int c, char *arg ATTRIBUTE_UNUSED) |
3c3bdf30 NC |
635 | { |
636 | switch (c) | |
637 | { | |
638 | case 'x': | |
639 | warn_on_expansion = 0; | |
973eb340 | 640 | allocate_undefined_gregs_in_linker = 1; |
3c3bdf30 NC |
641 | break; |
642 | ||
643 | case OPTION_RELAX: | |
644 | linkrelax = 1; | |
645 | break; | |
646 | ||
647 | case OPTION_NOEXPAND: | |
648 | expand_op = 0; | |
649 | break; | |
650 | ||
651 | case OPTION_NOMERGEGREG: | |
652 | merge_gregs = 0; | |
653 | break; | |
654 | ||
655 | case OPTION_NOSYMS: | |
656 | predefined_syms = 0; | |
657 | equated_spec_regs = 0; | |
658 | break; | |
659 | ||
660 | case OPTION_GNU_SYNTAX: | |
661 | mmix_gnu_syntax = 1; | |
662 | label_without_colon_this_line = 0; | |
663 | break; | |
664 | ||
665 | case OPTION_GLOBALIZE_SYMBOLS: | |
666 | mmix_globalize_symbols = 1; | |
667 | break; | |
668 | ||
669 | case OPTION_FIXED_SPEC_REGS: | |
670 | equated_spec_regs = 0; | |
671 | break; | |
672 | ||
973eb340 HPN |
673 | case OPTION_LINKER_ALLOCATED_GREGS: |
674 | allocate_undefined_gregs_in_linker = 1; | |
675 | break; | |
676 | ||
88fc725d HPN |
677 | case OPTION_NOPUSHJSTUBS: |
678 | pushj_stubs = 0; | |
679 | break; | |
680 | ||
3c3bdf30 NC |
681 | default: |
682 | return 0; | |
683 | } | |
684 | ||
685 | return 1; | |
686 | } | |
687 | ||
688 | /* Display MMIX-specific help text. */ | |
689 | ||
690 | void | |
ff1e783f | 691 | md_show_usage (FILE * stream) |
3c3bdf30 NC |
692 | { |
693 | fprintf (stream, _(" MMIX-specific command line options:\n")); | |
694 | fprintf (stream, _("\ | |
695 | -fixed-special-register-names\n\ | |
696 | Allow only the original special register names.\n")); | |
697 | fprintf (stream, _("\ | |
698 | -globalize-symbols Make all symbols global.\n")); | |
699 | fprintf (stream, _("\ | |
700 | -gnu-syntax Turn off mmixal syntax compatibility.\n")); | |
701 | fprintf (stream, _("\ | |
702 | -relax Create linker relaxable code.\n")); | |
703 | fprintf (stream, _("\ | |
704 | -no-predefined-syms Do not provide mmixal built-in constants.\n\ | |
705 | Implies -fixed-special-register-names.\n")); | |
706 | fprintf (stream, _("\ | |
707 | -no-expand Do not expand GETA, branches, PUSHJ or JUMP\n\ | |
708 | into multiple instructions.\n")); | |
709 | fprintf (stream, _("\ | |
710 | -no-merge-gregs Do not merge GREG definitions with nearby values.\n")); | |
711 | fprintf (stream, _("\ | |
973eb340 HPN |
712 | -linker-allocated-gregs If there's no suitable GREG definition for the\ |
713 | operands of an instruction, let the linker resolve.\n")); | |
714 | fprintf (stream, _("\ | |
3c3bdf30 NC |
715 | -x Do not warn when an operand to GETA, a branch,\n\ |
716 | PUSHJ or JUMP is not known to be within range.\n\ | |
973eb340 HPN |
717 | The linker will catch any errors. Implies\n\ |
718 | -linker-allocated-gregs.")); | |
3c3bdf30 NC |
719 | } |
720 | ||
721 | /* Step to end of line, but don't step over the end of the line. */ | |
722 | ||
723 | static void | |
ff1e783f | 724 | mmix_discard_rest_of_line (void) |
3c3bdf30 NC |
725 | { |
726 | while (*input_line_pointer | |
a1b6236b | 727 | && (! is_end_of_line[(unsigned char) *input_line_pointer] |
3c3bdf30 NC |
728 | || TC_EOL_IN_INSN (input_line_pointer))) |
729 | input_line_pointer++; | |
730 | } | |
731 | ||
732 | /* Act as demand_empty_rest_of_line if we're in strict GNU syntax mode, | |
733 | otherwise just ignore the rest of the line (and skip the end-of-line | |
734 | delimiter). */ | |
735 | ||
736 | static void | |
ff1e783f | 737 | mmix_handle_rest_of_empty_line (void) |
3c3bdf30 NC |
738 | { |
739 | if (mmix_gnu_syntax) | |
740 | demand_empty_rest_of_line (); | |
741 | else | |
742 | { | |
743 | mmix_discard_rest_of_line (); | |
744 | input_line_pointer++; | |
745 | } | |
746 | } | |
747 | ||
748 | /* Initialize GAS MMIX specifics. */ | |
749 | ||
750 | void | |
ff1e783f | 751 | mmix_md_begin (void) |
3c3bdf30 NC |
752 | { |
753 | int i; | |
754 | const struct mmix_opcode *opcode; | |
755 | ||
756 | /* We assume nobody will use this, so don't allocate any room. */ | |
757 | obstack_begin (&mmix_sym_obstack, 0); | |
758 | ||
759 | /* This will break the day the "lex" thingy changes. For now, it's the | |
760 | only way to make ':' part of a name, and a name beginner. */ | |
a1b6236b | 761 | lex_type[':'] = (LEX_NAME | LEX_BEGIN_NAME); |
3c3bdf30 NC |
762 | |
763 | mmix_opcode_hash = hash_new (); | |
764 | ||
765 | real_reg_section | |
766 | = bfd_make_section_old_way (stdoutput, MMIX_REG_SECTION_NAME); | |
767 | ||
768 | for (opcode = mmix_opcodes; opcode->name; opcode++) | |
769 | hash_insert (mmix_opcode_hash, opcode->name, (char *) opcode); | |
770 | ||
771 | /* We always insert the ordinary registers 0..255 as registers. */ | |
772 | for (i = 0; i < 256; i++) | |
773 | { | |
774 | char buf[5]; | |
775 | ||
776 | /* Alternatively, we could diddle with '$' and the following number, | |
777 | but keeping the registers as symbols helps keep parsing simple. */ | |
778 | sprintf (buf, "$%d", i); | |
779 | symbol_table_insert (symbol_new (buf, reg_section, i, | |
780 | &zero_address_frag)); | |
781 | } | |
782 | ||
783 | /* Insert mmixal built-in names if allowed. */ | |
784 | if (predefined_syms) | |
785 | { | |
786 | for (i = 0; mmix_spec_regs[i].name != NULL; i++) | |
787 | symbol_table_insert (symbol_new (mmix_spec_regs[i].name, | |
788 | reg_section, | |
789 | mmix_spec_regs[i].number + 256, | |
790 | &zero_address_frag)); | |
791 | ||
792 | /* FIXME: Perhaps these should be recognized as specials; as field | |
793 | names for those instructions. */ | |
794 | symbol_table_insert (symbol_new ("ROUND_CURRENT", reg_section, 512, | |
795 | &zero_address_frag)); | |
796 | symbol_table_insert (symbol_new ("ROUND_OFF", reg_section, 512 + 1, | |
797 | &zero_address_frag)); | |
798 | symbol_table_insert (symbol_new ("ROUND_UP", reg_section, 512 + 2, | |
799 | &zero_address_frag)); | |
800 | symbol_table_insert (symbol_new ("ROUND_DOWN", reg_section, 512 + 3, | |
801 | &zero_address_frag)); | |
802 | symbol_table_insert (symbol_new ("ROUND_NEAR", reg_section, 512 + 4, | |
803 | &zero_address_frag)); | |
804 | } | |
805 | } | |
806 | ||
807 | /* Assemble one insn in STR. */ | |
808 | ||
809 | void | |
ff1e783f | 810 | md_assemble (char *str) |
3c3bdf30 NC |
811 | { |
812 | char *operands = str; | |
813 | char modified_char = 0; | |
814 | struct mmix_opcode *instruction; | |
815 | fragS *opc_fragP = NULL; | |
816 | int max_operands = 3; | |
817 | ||
818 | /* Note that the struct frag member fr_literal in frags.h is char[], so | |
819 | I have to make this a plain char *. */ | |
820 | /* unsigned */ char *opcodep = NULL; | |
821 | ||
822 | expressionS exp[4]; | |
823 | int n_operands = 0; | |
824 | ||
825 | /* Move to end of opcode. */ | |
826 | for (operands = str; | |
827 | is_part_of_name (*operands); | |
828 | ++operands) | |
829 | ; | |
830 | ||
831 | if (ISSPACE (*operands)) | |
832 | { | |
833 | modified_char = *operands; | |
834 | *operands++ = '\0'; | |
835 | } | |
836 | ||
837 | instruction = (struct mmix_opcode *) hash_find (mmix_opcode_hash, str); | |
838 | if (instruction == NULL) | |
839 | { | |
840 | as_bad (_("unknown opcode: `%s'"), str); | |
841 | ||
842 | /* Avoid "unhandled label" errors. */ | |
843 | pending_label = NULL; | |
844 | return; | |
845 | } | |
846 | ||
847 | /* Put back the character after the opcode. */ | |
848 | if (modified_char != 0) | |
849 | operands[-1] = modified_char; | |
850 | ||
851 | input_line_pointer = operands; | |
852 | ||
853 | /* Is this a mmixal pseudodirective? */ | |
854 | if (instruction->type == mmix_type_pseudo) | |
855 | { | |
856 | /* For mmixal compatibility, a label for an instruction (and | |
857 | emitting pseudo) refers to the _aligned_ address. We emit the | |
858 | label here for the pseudos that don't handle it themselves. When | |
859 | having an fb-label, emit it here, and increment the counter after | |
860 | the pseudo. */ | |
861 | switch (instruction->operands) | |
862 | { | |
863 | case mmix_operands_loc: | |
864 | case mmix_operands_byte: | |
865 | case mmix_operands_prefix: | |
866 | case mmix_operands_local: | |
867 | case mmix_operands_bspec: | |
868 | case mmix_operands_espec: | |
869 | if (current_fb_label >= 0) | |
870 | colon (fb_label_name (current_fb_label, 1)); | |
871 | else if (pending_label != NULL) | |
872 | { | |
873 | colon (pending_label); | |
874 | pending_label = NULL; | |
875 | } | |
876 | break; | |
877 | ||
878 | default: | |
879 | break; | |
880 | } | |
881 | ||
882 | /* Some of the pseudos emit contents, others don't. Set a | |
883 | contents-emitted flag when we emit something into .text */ | |
884 | switch (instruction->operands) | |
885 | { | |
886 | case mmix_operands_loc: | |
887 | /* LOC */ | |
888 | s_loc (0); | |
889 | break; | |
890 | ||
891 | case mmix_operands_byte: | |
892 | /* BYTE */ | |
893 | mmix_byte (); | |
894 | break; | |
895 | ||
896 | case mmix_operands_wyde: | |
897 | /* WYDE */ | |
898 | mmix_cons (2); | |
899 | break; | |
900 | ||
901 | case mmix_operands_tetra: | |
902 | /* TETRA */ | |
903 | mmix_cons (4); | |
904 | break; | |
905 | ||
906 | case mmix_operands_octa: | |
907 | /* OCTA */ | |
908 | mmix_cons (8); | |
909 | break; | |
910 | ||
911 | case mmix_operands_prefix: | |
912 | /* PREFIX */ | |
913 | s_prefix (0); | |
914 | break; | |
915 | ||
916 | case mmix_operands_local: | |
917 | /* LOCAL */ | |
918 | mmix_s_local (0); | |
919 | break; | |
920 | ||
921 | case mmix_operands_bspec: | |
922 | /* BSPEC */ | |
923 | s_bspec (0); | |
924 | break; | |
925 | ||
926 | case mmix_operands_espec: | |
927 | /* ESPEC */ | |
928 | s_espec (0); | |
929 | break; | |
930 | ||
931 | default: | |
932 | BAD_CASE (instruction->operands); | |
933 | } | |
934 | ||
935 | /* These are all working like the pseudo functions in read.c:s_..., | |
936 | in that they step over the end-of-line marker at the end of the | |
937 | line. We don't want that here. */ | |
938 | input_line_pointer--; | |
939 | ||
940 | /* Step up the fb-label counter if there was a definition on this | |
941 | line. */ | |
942 | if (current_fb_label >= 0) | |
943 | { | |
944 | fb_label_instance_inc (current_fb_label); | |
945 | current_fb_label = -1; | |
946 | } | |
947 | ||
948 | /* Reset any don't-align-next-datum request, unless this was a LOC | |
949 | directive. */ | |
950 | if (instruction->operands != mmix_operands_loc) | |
951 | want_unaligned = 0; | |
952 | ||
953 | return; | |
954 | } | |
955 | ||
956 | /* Not a pseudo; we *will* emit contents. */ | |
957 | if (now_seg == data_section) | |
958 | { | |
959 | if (lowest_data_loc != (bfd_vma) -1 && (lowest_data_loc & 3) != 0) | |
960 | { | |
961 | if (data_has_contents) | |
962 | as_bad (_("specified location wasn't TETRA-aligned")); | |
963 | else if (want_unaligned) | |
964 | as_bad (_("unaligned data at an absolute location is not supported")); | |
965 | ||
966 | lowest_data_loc &= ~(bfd_vma) 3; | |
967 | lowest_data_loc += 4; | |
968 | } | |
969 | ||
970 | data_has_contents = 1; | |
971 | } | |
972 | else if (now_seg == text_section) | |
973 | { | |
974 | if (lowest_text_loc != (bfd_vma) -1 && (lowest_text_loc & 3) != 0) | |
975 | { | |
976 | if (text_has_contents) | |
977 | as_bad (_("specified location wasn't TETRA-aligned")); | |
978 | else if (want_unaligned) | |
979 | as_bad (_("unaligned data at an absolute location is not supported")); | |
980 | ||
981 | lowest_text_loc &= ~(bfd_vma) 3; | |
982 | lowest_text_loc += 4; | |
983 | } | |
984 | ||
985 | text_has_contents = 1; | |
986 | } | |
987 | ||
988 | /* After a sequence of BYTEs or WYDEs, we need to get to instruction | |
989 | alignment. For other pseudos, a ".p2align 2" is supposed to be | |
990 | inserted by the user. */ | |
991 | if (last_alignment < 2 && ! want_unaligned) | |
992 | { | |
993 | frag_align (2, 0, 0); | |
994 | record_alignment (now_seg, 2); | |
995 | last_alignment = 2; | |
996 | } | |
997 | else | |
998 | /* Reset any don't-align-next-datum request. */ | |
999 | want_unaligned = 0; | |
1000 | ||
1001 | /* For mmixal compatibility, a label for an instruction (and emitting | |
1002 | pseudo) refers to the _aligned_ address. So we have to emit the | |
1003 | label here. */ | |
1004 | if (pending_label != NULL) | |
1005 | { | |
1006 | colon (pending_label); | |
1007 | pending_label = NULL; | |
1008 | } | |
1009 | ||
1010 | /* We assume that mmix_opcodes keeps having unique mnemonics for each | |
1011 | opcode, so we don't have to iterate over more than one opcode; if the | |
1012 | syntax does not match, then there's a syntax error. */ | |
1013 | ||
1014 | /* Operands have little or no context and are all comma-separated; it is | |
1015 | easier to parse each expression first. */ | |
1016 | switch (instruction->operands) | |
1017 | { | |
1018 | case mmix_operands_reg_yz: | |
1019 | case mmix_operands_pop: | |
1020 | case mmix_operands_regaddr: | |
1021 | case mmix_operands_pushj: | |
1022 | case mmix_operands_get: | |
1023 | case mmix_operands_put: | |
1024 | case mmix_operands_set: | |
1025 | case mmix_operands_save: | |
1026 | case mmix_operands_unsave: | |
1027 | max_operands = 2; | |
1028 | break; | |
1029 | ||
1030 | case mmix_operands_sync: | |
1031 | case mmix_operands_jmp: | |
1032 | case mmix_operands_resume: | |
1033 | max_operands = 1; | |
1034 | break; | |
1035 | ||
1036 | /* The original 3 is fine for the rest. */ | |
1037 | default: | |
1038 | break; | |
1039 | } | |
1040 | ||
1041 | /* If this is GET or PUT, and we don't do allow those names to be | |
1042 | equated, we need to parse the names ourselves, so we don't pick up a | |
1043 | user label instead of the special register. */ | |
1044 | if (! equated_spec_regs | |
1045 | && (instruction->operands == mmix_operands_get | |
1046 | || instruction->operands == mmix_operands_put)) | |
1047 | n_operands = get_putget_operands (instruction, operands, exp); | |
1048 | else | |
1049 | n_operands = get_operands (max_operands, operands, exp); | |
1050 | ||
1051 | /* If there's a fb-label on the current line, set that label. This must | |
1052 | be done *after* evaluating expressions of operands, since neither a | |
1053 | "1B" nor a "1F" refers to "1H" on the same line. */ | |
1054 | if (current_fb_label >= 0) | |
1055 | { | |
1056 | fb_label_instance_inc (current_fb_label); | |
1057 | colon (fb_label_name (current_fb_label, 0)); | |
1058 | current_fb_label = -1; | |
1059 | } | |
1060 | ||
973eb340 HPN |
1061 | /* We also assume that the length of the instruction is at least 4, the |
1062 | size of an unexpanded instruction. We need a self-contained frag | |
1063 | since we want the relocation to point to the instruction, not the | |
1064 | variant part. */ | |
3c3bdf30 NC |
1065 | |
1066 | opcodep = frag_more (4); | |
1067 | mmix_opcode_frag = opc_fragP = frag_now; | |
1068 | frag_now->fr_opcode = opcodep; | |
1069 | ||
1070 | /* Mark start of insn for DWARF2 debug features. */ | |
1071 | if (OUTPUT_FLAVOR == bfd_target_elf_flavour) | |
1072 | dwarf2_emit_insn (4); | |
1073 | ||
1074 | md_number_to_chars (opcodep, instruction->match, 4); | |
1075 | ||
1076 | switch (instruction->operands) | |
1077 | { | |
1078 | case mmix_operands_jmp: | |
1079 | if (n_operands == 0 && ! mmix_gnu_syntax) | |
1080 | /* Zeros are in place - nothing needs to be done when we have no | |
1081 | operands. */ | |
1082 | break; | |
1083 | ||
1084 | /* Add a frag for a JMP relaxation; we need room for max four | |
1085 | extra instructions. We don't do any work around here to check if | |
1086 | we can determine the offset right away. */ | |
1087 | if (n_operands != 1 || exp[0].X_op == O_register) | |
1088 | { | |
1089 | as_bad (_("invalid operand to opcode %s: `%s'"), | |
1090 | instruction->name, operands); | |
1091 | return; | |
1092 | } | |
1093 | ||
1094 | if (expand_op) | |
a1b6236b | 1095 | frag_var (rs_machine_dependent, 4 * 4, 0, |
3c3bdf30 NC |
1096 | ENCODE_RELAX (STATE_JMP, STATE_UNDF), |
1097 | exp[0].X_add_symbol, | |
1098 | exp[0].X_add_number, | |
1099 | opcodep); | |
1100 | else | |
1101 | fix_new_exp (opc_fragP, opcodep - opc_fragP->fr_literal, 4, | |
1102 | exp + 0, 1, BFD_RELOC_MMIX_ADDR27); | |
1103 | break; | |
1104 | ||
1105 | case mmix_operands_pushj: | |
1106 | /* We take care of PUSHJ in full here. */ | |
1107 | if (n_operands != 2 | |
1108 | || ((exp[0].X_op == O_constant || exp[0].X_op == O_register) | |
1109 | && (exp[0].X_add_number > 255 || exp[0].X_add_number < 0))) | |
1110 | { | |
1111 | as_bad (_("invalid operands to opcode %s: `%s'"), | |
1112 | instruction->name, operands); | |
1113 | return; | |
1114 | } | |
1115 | ||
1116 | if (exp[0].X_op == O_register || exp[0].X_op == O_constant) | |
1117 | opcodep[1] = exp[0].X_add_number; | |
1118 | else | |
1119 | fix_new_exp (opc_fragP, opcodep - opc_fragP->fr_literal + 1, | |
1120 | 1, exp + 0, 0, BFD_RELOC_MMIX_REG_OR_BYTE); | |
1121 | ||
1122 | if (expand_op) | |
1123 | frag_var (rs_machine_dependent, PUSHJ_MAX_LEN - 4, 0, | |
1124 | ENCODE_RELAX (STATE_PUSHJ, STATE_UNDF), | |
1125 | exp[1].X_add_symbol, | |
1126 | exp[1].X_add_number, | |
1127 | opcodep); | |
1128 | else | |
1129 | fix_new_exp (opc_fragP, opcodep - opc_fragP->fr_literal, 4, | |
1130 | exp + 1, 1, BFD_RELOC_MMIX_ADDR19); | |
1131 | break; | |
1132 | ||
1133 | case mmix_operands_regaddr: | |
1134 | /* GETA/branch: Add a frag for relaxation. We don't do any work | |
1135 | around here to check if we can determine the offset right away. */ | |
1136 | if (n_operands != 2 || exp[1].X_op == O_register) | |
1137 | { | |
1138 | as_bad (_("invalid operands to opcode %s: `%s'"), | |
1139 | instruction->name, operands); | |
1140 | return; | |
1141 | } | |
1142 | ||
1143 | if (! expand_op) | |
1144 | fix_new_exp (opc_fragP, opcodep - opc_fragP->fr_literal, 4, | |
1145 | exp + 1, 1, BFD_RELOC_MMIX_ADDR19); | |
1146 | else if (instruction->type == mmix_type_condbranch) | |
1147 | frag_var (rs_machine_dependent, BCC_MAX_LEN - 4, 0, | |
1148 | ENCODE_RELAX (STATE_BCC, STATE_UNDF), | |
1149 | exp[1].X_add_symbol, | |
1150 | exp[1].X_add_number, | |
1151 | opcodep); | |
1152 | else | |
1153 | frag_var (rs_machine_dependent, GETA_MAX_LEN - 4, 0, | |
1154 | ENCODE_RELAX (STATE_GETA, STATE_UNDF), | |
1155 | exp[1].X_add_symbol, | |
1156 | exp[1].X_add_number, | |
1157 | opcodep); | |
1158 | break; | |
1159 | ||
1160 | default: | |
1161 | break; | |
1162 | } | |
1163 | ||
1164 | switch (instruction->operands) | |
1165 | { | |
1166 | case mmix_operands_regs: | |
1167 | /* We check the number of operands here, since we're in a | |
1168 | FALLTHROUGH sequence in the next switch. */ | |
1169 | if (n_operands != 3 || exp[2].X_op == O_constant) | |
1170 | { | |
1171 | as_bad (_("invalid operands to opcode %s: `%s'"), | |
1172 | instruction->name, operands); | |
1173 | return; | |
1174 | } | |
1175 | /* FALLTHROUGH. */ | |
1176 | case mmix_operands_regs_z: | |
1177 | if (n_operands != 3) | |
1178 | { | |
1179 | as_bad (_("invalid operands to opcode %s: `%s'"), | |
1180 | instruction->name, operands); | |
1181 | return; | |
1182 | } | |
1183 | /* FALLTHROUGH. */ | |
1184 | case mmix_operands_reg_yz: | |
1185 | case mmix_operands_roundregs_z: | |
1186 | case mmix_operands_roundregs: | |
1187 | case mmix_operands_regs_z_opt: | |
1188 | case mmix_operands_neg: | |
1189 | case mmix_operands_regaddr: | |
1190 | case mmix_operands_get: | |
1191 | case mmix_operands_set: | |
1192 | case mmix_operands_save: | |
1193 | if (n_operands < 1 | |
1194 | || (exp[0].X_op == O_register && exp[0].X_add_number > 255)) | |
1195 | { | |
1196 | as_bad (_("invalid operands to opcode %s: `%s'"), | |
1197 | instruction->name, operands); | |
1198 | return; | |
1199 | } | |
1200 | ||
1201 | if (exp[0].X_op == O_register) | |
1202 | opcodep[1] = exp[0].X_add_number; | |
1203 | else | |
1204 | fix_new_exp (opc_fragP, opcodep - opc_fragP->fr_literal + 1, | |
1205 | 1, exp + 0, 0, BFD_RELOC_MMIX_REG); | |
1206 | break; | |
1207 | ||
1208 | default: | |
1209 | ; | |
1210 | } | |
1211 | ||
1212 | /* A corresponding once-over for those who take an 8-bit constant as | |
1213 | their first operand. */ | |
1214 | switch (instruction->operands) | |
1215 | { | |
1216 | case mmix_operands_pushgo: | |
1217 | /* PUSHGO: X is a constant, but can be expressed as a register. | |
1218 | We handle X here and use the common machinery of T,X,3,$ for | |
1219 | the rest of the operands. */ | |
1220 | if (n_operands < 2 | |
1221 | || ((exp[0].X_op == O_constant || exp[0].X_op == O_register) | |
1222 | && (exp[0].X_add_number > 255 || exp[0].X_add_number < 0))) | |
1223 | { | |
1224 | as_bad (_("invalid operands to opcode %s: `%s'"), | |
1225 | instruction->name, operands); | |
1226 | return; | |
1227 | } | |
1228 | else if (exp[0].X_op == O_constant || exp[0].X_op == O_register) | |
1229 | opcodep[1] = exp[0].X_add_number; | |
1230 | else | |
1231 | fix_new_exp (opc_fragP, opcodep - opc_fragP->fr_literal + 1, | |
1232 | 1, exp + 0, 0, BFD_RELOC_MMIX_REG_OR_BYTE); | |
1233 | break; | |
1234 | ||
1235 | case mmix_operands_pop: | |
1236 | if ((n_operands == 0 || n_operands == 1) && ! mmix_gnu_syntax) | |
1237 | break; | |
1238 | /* FALLTHROUGH. */ | |
1239 | case mmix_operands_x_regs_z: | |
1240 | if (n_operands < 1 | |
1241 | || (exp[0].X_op == O_constant | |
1242 | && (exp[0].X_add_number > 255 | |
1243 | || exp[0].X_add_number < 0))) | |
1244 | { | |
1245 | as_bad (_("invalid operands to opcode %s: `%s'"), | |
1246 | instruction->name, operands); | |
1247 | return; | |
1248 | } | |
1249 | ||
1250 | if (exp[0].X_op == O_constant) | |
1251 | opcodep[1] = exp[0].X_add_number; | |
1252 | else | |
1253 | /* FIXME: This doesn't bring us unsignedness checking. */ | |
1254 | fix_new_exp (opc_fragP, opcodep - opc_fragP->fr_literal + 1, | |
1255 | 1, exp + 0, 0, BFD_RELOC_8); | |
1256 | default: | |
1257 | ; | |
1258 | } | |
1259 | ||
1260 | /* Handle the rest. */ | |
1261 | switch (instruction->operands) | |
1262 | { | |
1263 | case mmix_operands_set: | |
1264 | /* SET: Either two registers, "$X,$Y", with Z field as zero, or | |
1265 | "$X,YZ", meaning change the opcode to SETL. */ | |
1266 | if (n_operands != 2 | |
1267 | || (exp[1].X_op == O_constant | |
1268 | && (exp[1].X_add_number > 0xffff || exp[1].X_add_number < 0))) | |
1269 | { | |
1270 | as_bad (_("invalid operands to opcode %s: `%s'"), | |
1271 | instruction->name, operands); | |
1272 | return; | |
1273 | } | |
1274 | ||
1275 | if (exp[1].X_op == O_constant) | |
1276 | { | |
1277 | /* There's an ambiguity with "SET $0,Y" when Y isn't defined | |
1278 | yet. To keep things simple, we assume that Y is then a | |
1279 | register, and only change the opcode if Y is defined at this | |
1280 | point. | |
1281 | ||
1282 | There's no compatibility problem with mmixal, since it emits | |
1283 | errors if the field is not defined at this point. */ | |
1284 | md_number_to_chars (opcodep, SETL_INSN_BYTE, 1); | |
1285 | ||
1286 | opcodep[2] = (exp[1].X_add_number >> 8) & 255; | |
1287 | opcodep[3] = exp[1].X_add_number & 255; | |
1288 | break; | |
1289 | } | |
1290 | /* FALLTHROUGH. */ | |
1291 | case mmix_operands_x_regs_z: | |
1292 | /* SYNCD: "X,$Y,$Z|Z". */ | |
1293 | /* FALLTHROUGH. */ | |
1294 | case mmix_operands_regs: | |
a1b6236b | 1295 | /* Three registers, $X,$Y,$Z. */ |
3c3bdf30 NC |
1296 | /* FALLTHROUGH. */ |
1297 | case mmix_operands_regs_z: | |
1298 | /* Operands "$X,$Y,$Z|Z", number of arguments checked above. */ | |
1299 | /* FALLTHROUGH. */ | |
1300 | case mmix_operands_pushgo: | |
1301 | /* Operands "$X|X,$Y,$Z|Z", optional Z. */ | |
1302 | /* FALLTHROUGH. */ | |
1303 | case mmix_operands_regs_z_opt: | |
1304 | /* Operands "$X,$Y,$Z|Z", with $Z|Z being optional, default 0. Any | |
1305 | operands not completely decided yet are postponed to later in | |
1306 | assembly (but not until link-time yet). */ | |
1307 | ||
1308 | if ((n_operands != 2 && n_operands != 3) | |
1309 | || (exp[1].X_op == O_register && exp[1].X_add_number > 255) | |
1310 | || (n_operands == 3 | |
1311 | && ((exp[2].X_op == O_register | |
1312 | && exp[2].X_add_number > 255 | |
1313 | && mmix_gnu_syntax) | |
1314 | || (exp[2].X_op == O_constant | |
1315 | && (exp[2].X_add_number > 255 | |
1316 | || exp[2].X_add_number < 0))))) | |
1317 | { | |
1318 | as_bad (_("invalid operands to opcode %s: `%s'"), | |
1319 | instruction->name, operands); | |
1320 | return; | |
1321 | } | |
1322 | ||
1323 | if (n_operands == 2) | |
1324 | { | |
1325 | symbolS *sym; | |
1326 | ||
1327 | /* The last operand is immediate whenever we see just two | |
1328 | operands. */ | |
1329 | opcodep[0] |= IMM_OFFSET_BIT; | |
1330 | ||
1331 | /* Now, we could either have an implied "0" as the Z operand, or | |
1332 | it could be the constant of a "base address plus offset". It | |
1333 | depends on whether it is allowed; only memory operations, as | |
1334 | signified by instruction->type and "T" and "X" operand types, | |
1335 | and it depends on whether we find a register in the second | |
1336 | operand, exp[1]. */ | |
1337 | if (exp[1].X_op == O_register && exp[1].X_add_number <= 255) | |
1338 | { | |
1339 | /* A zero then; all done. */ | |
1340 | opcodep[2] = exp[1].X_add_number; | |
1341 | break; | |
1342 | } | |
1343 | ||
1344 | /* Not known as a register. Is base address plus offset | |
1345 | allowed, or can we assume that it is a register anyway? */ | |
1346 | if ((instruction->operands != mmix_operands_regs_z_opt | |
1347 | && instruction->operands != mmix_operands_x_regs_z | |
1348 | && instruction->operands != mmix_operands_pushgo) | |
1349 | || (instruction->type != mmix_type_memaccess_octa | |
1350 | && instruction->type != mmix_type_memaccess_tetra | |
1351 | && instruction->type != mmix_type_memaccess_wyde | |
1352 | && instruction->type != mmix_type_memaccess_byte | |
1353 | && instruction->type != mmix_type_memaccess_block | |
1354 | && instruction->type != mmix_type_jsr | |
1355 | && instruction->type != mmix_type_branch)) | |
1356 | { | |
1357 | fix_new_exp (opc_fragP, opcodep - opc_fragP->fr_literal + 2, | |
1358 | 1, exp + 1, 0, BFD_RELOC_MMIX_REG); | |
1359 | break; | |
1360 | } | |
1361 | ||
1362 | /* To avoid getting a NULL add_symbol for constants and then | |
1363 | catching a SEGV in write_relocs since it doesn't handle | |
1364 | constants well for relocs other than PC-relative, we need to | |
1365 | pass expressions as symbols and use fix_new, not fix_new_exp. */ | |
1366 | sym = make_expr_symbol (exp + 1); | |
1367 | ||
455bde50 AM |
1368 | /* Mark the symbol as being OK for a reloc. */ |
1369 | symbol_get_bfdsym (sym)->flags |= BSF_KEEP; | |
1370 | ||
3c3bdf30 NC |
1371 | /* Now we know it can be a "base address plus offset". Add |
1372 | proper fixup types so we can handle this later, when we've | |
1373 | parsed everything. */ | |
1374 | fix_new (opc_fragP, opcodep - opc_fragP->fr_literal + 2, | |
1375 | 8, sym, 0, 0, BFD_RELOC_MMIX_BASE_PLUS_OFFSET); | |
1376 | break; | |
1377 | } | |
1378 | ||
1379 | if (exp[1].X_op == O_register) | |
1380 | opcodep[2] = exp[1].X_add_number; | |
1381 | else | |
1382 | fix_new_exp (opc_fragP, opcodep - opc_fragP->fr_literal + 2, | |
1383 | 1, exp + 1, 0, BFD_RELOC_MMIX_REG); | |
1384 | ||
1385 | /* In mmixal compatibility mode, we allow special registers as | |
1386 | constants for the Z operand. They have 256 added to their | |
1387 | register numbers, so the right thing will happen if we just treat | |
1388 | those as constants. */ | |
1389 | if (exp[2].X_op == O_register && exp[2].X_add_number <= 255) | |
1390 | opcodep[3] = exp[2].X_add_number; | |
1391 | else if (exp[2].X_op == O_constant | |
1392 | || (exp[2].X_op == O_register && exp[2].X_add_number > 255)) | |
1393 | { | |
1394 | opcodep[3] = exp[2].X_add_number; | |
1395 | opcodep[0] |= IMM_OFFSET_BIT; | |
1396 | } | |
1397 | else | |
1398 | fix_new_exp (opc_fragP, opcodep - opc_fragP->fr_literal + 3, | |
1399 | 1, exp + 2, 0, | |
1400 | (instruction->operands == mmix_operands_set | |
1401 | || instruction->operands == mmix_operands_regs) | |
1402 | ? BFD_RELOC_MMIX_REG : BFD_RELOC_MMIX_REG_OR_BYTE); | |
1403 | break; | |
1404 | ||
1405 | case mmix_operands_pop: | |
1406 | /* POP, one eight and one 16-bit operand. */ | |
1407 | if (n_operands == 0 && ! mmix_gnu_syntax) | |
1408 | break; | |
1409 | if (n_operands == 1 && ! mmix_gnu_syntax) | |
1410 | goto a_single_24_bit_number_operand; | |
1411 | /* FALLTHROUGH. */ | |
1412 | case mmix_operands_reg_yz: | |
1413 | /* A register and a 16-bit unsigned number. */ | |
1414 | if (n_operands != 2 | |
1415 | || exp[1].X_op == O_register | |
1416 | || (exp[1].X_op == O_constant | |
1417 | && (exp[1].X_add_number > 0xffff || exp[1].X_add_number < 0))) | |
1418 | { | |
1419 | as_bad (_("invalid operands to opcode %s: `%s'"), | |
1420 | instruction->name, operands); | |
1421 | return; | |
1422 | } | |
1423 | ||
1424 | if (exp[1].X_op == O_constant) | |
1425 | { | |
1426 | opcodep[2] = (exp[1].X_add_number >> 8) & 255; | |
1427 | opcodep[3] = exp[1].X_add_number & 255; | |
1428 | } | |
1429 | else | |
1430 | /* FIXME: This doesn't bring us unsignedness checking. */ | |
1431 | fix_new_exp (opc_fragP, opcodep - opc_fragP->fr_literal + 2, | |
1432 | 2, exp + 1, 0, BFD_RELOC_16); | |
1433 | break; | |
1434 | ||
1435 | case mmix_operands_jmp: | |
67c1ffbe | 1436 | /* A JMP. Everything is already done. */ |
3c3bdf30 NC |
1437 | break; |
1438 | ||
1439 | case mmix_operands_roundregs: | |
1440 | /* Two registers with optional rounding mode or constant in between. */ | |
1441 | if ((n_operands == 3 && exp[2].X_op == O_constant) | |
1442 | || (n_operands == 2 && exp[1].X_op == O_constant)) | |
1443 | { | |
1444 | as_bad (_("invalid operands to opcode %s: `%s'"), | |
1445 | instruction->name, operands); | |
1446 | return; | |
1447 | } | |
1448 | /* FALLTHROUGH. */ | |
1449 | case mmix_operands_roundregs_z: | |
1450 | /* Like FLOT, "$X,ROUND_MODE,$Z|Z", but the rounding mode is | |
1451 | optional and can be the corresponding constant. */ | |
1452 | { | |
1453 | /* Which exp index holds the second operand (not the rounding | |
1454 | mode). */ | |
1455 | int op2no = n_operands - 1; | |
1456 | ||
1457 | if ((n_operands != 2 && n_operands != 3) | |
1458 | || ((exp[op2no].X_op == O_register | |
1459 | && exp[op2no].X_add_number > 255) | |
1460 | || (exp[op2no].X_op == O_constant | |
1461 | && (exp[op2no].X_add_number > 255 | |
1462 | || exp[op2no].X_add_number < 0))) | |
1463 | || (n_operands == 3 | |
1464 | /* We don't allow for the rounding mode to be deferred; it | |
1465 | must be determined in the "first pass". It cannot be a | |
1466 | symbol equated to a rounding mode, but defined after | |
1467 | the first use. */ | |
1468 | && ((exp[1].X_op == O_register | |
1469 | && exp[1].X_add_number < 512) | |
1470 | || (exp[1].X_op == O_constant | |
1471 | && exp[1].X_add_number < 0 | |
1472 | && exp[1].X_add_number > 4) | |
1473 | || (exp[1].X_op != O_register | |
1474 | && exp[1].X_op != O_constant)))) | |
1475 | { | |
1476 | as_bad (_("invalid operands to opcode %s: `%s'"), | |
1477 | instruction->name, operands); | |
1478 | return; | |
1479 | } | |
1480 | ||
1481 | /* Add rounding mode if present. */ | |
1482 | if (n_operands == 3) | |
1483 | opcodep[2] = exp[1].X_add_number & 255; | |
1484 | ||
1485 | if (exp[op2no].X_op == O_register) | |
1486 | opcodep[3] = exp[op2no].X_add_number; | |
1487 | else if (exp[op2no].X_op == O_constant) | |
1488 | { | |
1489 | opcodep[3] = exp[op2no].X_add_number; | |
1490 | opcodep[0] |= IMM_OFFSET_BIT; | |
1491 | } | |
1492 | else | |
1493 | fix_new_exp (opc_fragP, opcodep - opc_fragP->fr_literal + 3, | |
1494 | 1, exp + op2no, 0, | |
1495 | instruction->operands == mmix_operands_roundregs | |
1496 | ? BFD_RELOC_MMIX_REG | |
1497 | : BFD_RELOC_MMIX_REG_OR_BYTE); | |
1498 | break; | |
1499 | } | |
1500 | ||
1501 | case mmix_operands_sync: | |
1502 | a_single_24_bit_number_operand: | |
a1b6236b KH |
1503 | if (n_operands != 1 |
1504 | || exp[0].X_op == O_register | |
1505 | || (exp[0].X_op == O_constant | |
1506 | && (exp[0].X_add_number > 0xffffff || exp[0].X_add_number < 0))) | |
1507 | { | |
1508 | as_bad (_("invalid operands to opcode %s: `%s'"), | |
1509 | instruction->name, operands); | |
1510 | return; | |
1511 | } | |
3c3bdf30 | 1512 | |
a1b6236b KH |
1513 | if (exp[0].X_op == O_constant) |
1514 | { | |
1515 | opcodep[1] = (exp[0].X_add_number >> 16) & 255; | |
1516 | opcodep[2] = (exp[0].X_add_number >> 8) & 255; | |
1517 | opcodep[3] = exp[0].X_add_number & 255; | |
1518 | } | |
1519 | else | |
1520 | /* FIXME: This doesn't bring us unsignedness checking. */ | |
1521 | fix_new_exp (opc_fragP, opcodep - opc_fragP->fr_literal + 1, | |
1522 | 3, exp + 0, 0, BFD_RELOC_24); | |
1523 | break; | |
3c3bdf30 NC |
1524 | |
1525 | case mmix_operands_neg: | |
1526 | /* Operands "$X,Y,$Z|Z"; NEG or NEGU. Y is optional, 0 is default. */ | |
1527 | ||
1528 | if ((n_operands != 3 && n_operands != 2) | |
1529 | || (n_operands == 3 && exp[1].X_op == O_register) | |
1530 | || ((exp[1].X_op == O_constant || exp[1].X_op == O_register) | |
1531 | && (exp[1].X_add_number > 255 || exp[1].X_add_number < 0)) | |
1532 | || (n_operands == 3 | |
1533 | && ((exp[2].X_op == O_register && exp[2].X_add_number > 255) | |
1534 | || (exp[2].X_op == O_constant | |
1535 | && (exp[2].X_add_number > 255 | |
1536 | || exp[2].X_add_number < 0))))) | |
1537 | { | |
1538 | as_bad (_("invalid operands to opcode %s: `%s'"), | |
1539 | instruction->name, operands); | |
1540 | return; | |
1541 | } | |
1542 | ||
1543 | if (n_operands == 2) | |
1544 | { | |
1545 | if (exp[1].X_op == O_register) | |
1546 | opcodep[3] = exp[1].X_add_number; | |
1547 | else if (exp[1].X_op == O_constant) | |
1548 | { | |
1549 | opcodep[3] = exp[1].X_add_number; | |
1550 | opcodep[0] |= IMM_OFFSET_BIT; | |
1551 | } | |
1552 | else | |
1553 | fix_new_exp (opc_fragP, opcodep - opc_fragP->fr_literal + 3, | |
1554 | 1, exp + 1, 0, BFD_RELOC_MMIX_REG_OR_BYTE); | |
1555 | break; | |
1556 | } | |
1557 | ||
1558 | if (exp[1].X_op == O_constant) | |
1559 | opcodep[2] = exp[1].X_add_number; | |
1560 | else | |
1561 | fix_new_exp (opc_fragP, opcodep - opc_fragP->fr_literal + 2, | |
1562 | 1, exp + 1, 0, BFD_RELOC_8); | |
1563 | ||
1564 | if (exp[2].X_op == O_register) | |
1565 | opcodep[3] = exp[2].X_add_number; | |
1566 | else if (exp[2].X_op == O_constant) | |
1567 | { | |
1568 | opcodep[3] = exp[2].X_add_number; | |
1569 | opcodep[0] |= IMM_OFFSET_BIT; | |
1570 | } | |
1571 | else | |
1572 | fix_new_exp (opc_fragP, opcodep - opc_fragP->fr_literal + 3, | |
1573 | 1, exp + 2, 0, BFD_RELOC_MMIX_REG_OR_BYTE); | |
1574 | break; | |
1575 | ||
1576 | case mmix_operands_regaddr: | |
a1b6236b | 1577 | /* A GETA/branch-type. */ |
3c3bdf30 NC |
1578 | break; |
1579 | ||
1580 | case mmix_operands_get: | |
1581 | /* "$X,spec_reg"; GET. | |
1582 | Like with rounding modes, we demand that the special register or | |
1583 | symbol is already defined when we get here at the point of use. */ | |
1584 | if (n_operands != 2 | |
1585 | || (exp[1].X_op == O_register | |
1586 | && (exp[1].X_add_number < 256 || exp[1].X_add_number >= 512)) | |
1587 | || (exp[1].X_op == O_constant | |
1588 | && (exp[1].X_add_number < 0 || exp[1].X_add_number > 256)) | |
1589 | || (exp[1].X_op != O_constant && exp[1].X_op != O_register)) | |
1590 | { | |
1591 | as_bad (_("invalid operands to opcode %s: `%s'"), | |
1592 | instruction->name, operands); | |
1593 | return; | |
1594 | } | |
1595 | ||
1596 | opcodep[3] = exp[1].X_add_number - 256; | |
1597 | break; | |
1598 | ||
1599 | case mmix_operands_put: | |
1600 | /* "spec_reg,$Z|Z"; PUT. */ | |
1601 | if (n_operands != 2 | |
1602 | || (exp[0].X_op == O_register | |
1603 | && (exp[0].X_add_number < 256 || exp[0].X_add_number >= 512)) | |
1604 | || (exp[0].X_op == O_constant | |
1605 | && (exp[0].X_add_number < 0 || exp[0].X_add_number > 256)) | |
1606 | || (exp[0].X_op != O_constant && exp[0].X_op != O_register)) | |
1607 | { | |
1608 | as_bad (_("invalid operands to opcode %s: `%s'"), | |
1609 | instruction->name, operands); | |
1610 | return; | |
1611 | } | |
1612 | ||
1613 | opcodep[1] = exp[0].X_add_number - 256; | |
1614 | ||
1615 | /* Note that the Y field is zero. */ | |
1616 | ||
1617 | if (exp[1].X_op == O_register) | |
1618 | opcodep[3] = exp[1].X_add_number; | |
1619 | else if (exp[1].X_op == O_constant) | |
1620 | { | |
1621 | opcodep[3] = exp[1].X_add_number; | |
1622 | opcodep[0] |= IMM_OFFSET_BIT; | |
1623 | } | |
1624 | else | |
1625 | fix_new_exp (opc_fragP, opcodep - opc_fragP->fr_literal + 3, | |
1626 | 1, exp + 1, 0, BFD_RELOC_MMIX_REG_OR_BYTE); | |
1627 | break; | |
1628 | ||
1629 | case mmix_operands_save: | |
1630 | /* "$X,0"; SAVE. */ | |
1631 | if (n_operands != 2 | |
1632 | || exp[1].X_op != O_constant | |
1633 | || exp[1].X_add_number != 0) | |
1634 | { | |
1635 | as_bad (_("invalid operands to opcode %s: `%s'"), | |
1636 | instruction->name, operands); | |
1637 | return; | |
1638 | } | |
1639 | break; | |
1640 | ||
1641 | case mmix_operands_unsave: | |
1642 | if (n_operands < 2 && ! mmix_gnu_syntax) | |
1643 | { | |
1644 | if (n_operands == 1) | |
1645 | { | |
1646 | if (exp[0].X_op == O_register) | |
1647 | opcodep[3] = exp[0].X_add_number; | |
1648 | else | |
1649 | fix_new_exp (opc_fragP, opcodep - opc_fragP->fr_literal + 3, | |
1650 | 1, exp, 0, BFD_RELOC_MMIX_REG); | |
1651 | } | |
1652 | break; | |
1653 | } | |
1654 | ||
a1b6236b | 1655 | /* "0,$Z"; UNSAVE. */ |
3c3bdf30 NC |
1656 | if (n_operands != 2 |
1657 | || exp[0].X_op != O_constant | |
1658 | || exp[0].X_add_number != 0 | |
1659 | || exp[1].X_op == O_constant | |
1660 | || (exp[1].X_op == O_register | |
1661 | && exp[1].X_add_number > 255)) | |
1662 | { | |
1663 | as_bad (_("invalid operands to opcode %s: `%s'"), | |
1664 | instruction->name, operands); | |
1665 | return; | |
1666 | } | |
1667 | ||
1668 | if (exp[1].X_op == O_register) | |
1669 | opcodep[3] = exp[1].X_add_number; | |
1670 | else | |
1671 | fix_new_exp (opc_fragP, opcodep - opc_fragP->fr_literal + 3, | |
1672 | 1, exp + 1, 0, BFD_RELOC_MMIX_REG); | |
1673 | break; | |
1674 | ||
1675 | case mmix_operands_xyz_opt: | |
3e81d9f9 HPN |
1676 | /* SWYM, TRIP, TRAP: zero, one, two or three operands. It's |
1677 | unspecified whether operands are registers or constants, but | |
1678 | when we find register syntax, we require operands to be literal and | |
1679 | within 0..255. */ | |
3c3bdf30 NC |
1680 | if (n_operands == 0 && ! mmix_gnu_syntax) |
1681 | /* Zeros are in place - nothing needs to be done for zero | |
1682 | operands. We don't allow this in GNU syntax mode, because it | |
1683 | was believed that the risk of missing to supply an operand is | |
1684 | higher than the benefit of not having to specify a zero. */ | |
1685 | ; | |
1686 | else if (n_operands == 1 && exp[0].X_op != O_register) | |
1687 | { | |
1688 | if (exp[0].X_op == O_constant) | |
1689 | { | |
3e81d9f9 | 1690 | if (exp[0].X_add_number > 255*256*256 |
3c3bdf30 NC |
1691 | || exp[0].X_add_number < 0) |
1692 | { | |
1693 | as_bad (_("invalid operands to opcode %s: `%s'"), | |
1694 | instruction->name, operands); | |
1695 | return; | |
1696 | } | |
1697 | else | |
1698 | { | |
1699 | opcodep[1] = (exp[0].X_add_number >> 16) & 255; | |
1700 | opcodep[2] = (exp[0].X_add_number >> 8) & 255; | |
1701 | opcodep[3] = exp[0].X_add_number & 255; | |
1702 | } | |
1703 | } | |
1704 | else | |
1705 | fix_new_exp (opc_fragP, opcodep - opc_fragP->fr_literal + 1, | |
1706 | 3, exp, 0, BFD_RELOC_24); | |
1707 | } | |
1708 | else if (n_operands == 2 | |
1709 | && exp[0].X_op != O_register | |
1710 | && exp[1].X_op != O_register) | |
1711 | { | |
1712 | /* Two operands. */ | |
1713 | ||
1714 | if (exp[0].X_op == O_constant) | |
1715 | { | |
1716 | if (exp[0].X_add_number > 255 | |
1717 | || exp[0].X_add_number < 0) | |
1718 | { | |
1719 | as_bad (_("invalid operands to opcode %s: `%s'"), | |
1720 | instruction->name, operands); | |
1721 | return; | |
1722 | } | |
1723 | else | |
1724 | opcodep[1] = exp[0].X_add_number & 255; | |
1725 | } | |
1726 | else | |
1727 | fix_new_exp (opc_fragP, opcodep - opc_fragP->fr_literal + 1, | |
1728 | 1, exp, 0, BFD_RELOC_8); | |
1729 | ||
1730 | if (exp[1].X_op == O_constant) | |
1731 | { | |
3e81d9f9 | 1732 | if (exp[1].X_add_number > 255*256 |
3c3bdf30 NC |
1733 | || exp[1].X_add_number < 0) |
1734 | { | |
1735 | as_bad (_("invalid operands to opcode %s: `%s'"), | |
1736 | instruction->name, operands); | |
1737 | return; | |
1738 | } | |
1739 | else | |
1740 | { | |
1741 | opcodep[2] = (exp[1].X_add_number >> 8) & 255; | |
1742 | opcodep[3] = exp[1].X_add_number & 255; | |
1743 | } | |
1744 | } | |
1745 | else | |
1746 | fix_new_exp (opc_fragP, opcodep - opc_fragP->fr_literal + 2, | |
1747 | 2, exp + 1, 0, BFD_RELOC_16); | |
1748 | } | |
1749 | else if (n_operands == 3 | |
1750 | && exp[0].X_op != O_register | |
1751 | && exp[1].X_op != O_register | |
1752 | && exp[2].X_op != O_register) | |
1753 | { | |
1754 | /* Three operands. */ | |
1755 | ||
1756 | if (exp[0].X_op == O_constant) | |
1757 | { | |
1758 | if (exp[0].X_add_number > 255 | |
1759 | || exp[0].X_add_number < 0) | |
1760 | { | |
1761 | as_bad (_("invalid operands to opcode %s: `%s'"), | |
1762 | instruction->name, operands); | |
1763 | return; | |
1764 | } | |
1765 | else | |
1766 | opcodep[1] = exp[0].X_add_number & 255; | |
1767 | } | |
1768 | else | |
1769 | fix_new_exp (opc_fragP, opcodep - opc_fragP->fr_literal + 1, | |
1770 | 1, exp, 0, BFD_RELOC_8); | |
1771 | ||
1772 | if (exp[1].X_op == O_constant) | |
1773 | { | |
1774 | if (exp[1].X_add_number > 255 | |
1775 | || exp[1].X_add_number < 0) | |
1776 | { | |
1777 | as_bad (_("invalid operands to opcode %s: `%s'"), | |
1778 | instruction->name, operands); | |
1779 | return; | |
1780 | } | |
1781 | else | |
1782 | opcodep[2] = exp[1].X_add_number & 255; | |
1783 | } | |
1784 | else | |
1785 | fix_new_exp (opc_fragP, opcodep - opc_fragP->fr_literal + 2, | |
1786 | 1, exp + 1, 0, BFD_RELOC_8); | |
1787 | ||
1788 | if (exp[2].X_op == O_constant) | |
1789 | { | |
1790 | if (exp[2].X_add_number > 255 | |
1791 | || exp[2].X_add_number < 0) | |
1792 | { | |
1793 | as_bad (_("invalid operands to opcode %s: `%s'"), | |
1794 | instruction->name, operands); | |
1795 | return; | |
1796 | } | |
1797 | else | |
1798 | opcodep[3] = exp[2].X_add_number & 255; | |
1799 | } | |
1800 | else | |
1801 | fix_new_exp (opc_fragP, opcodep - opc_fragP->fr_literal + 3, | |
1802 | 1, exp + 2, 0, BFD_RELOC_8); | |
1803 | } | |
3e81d9f9 | 1804 | else |
3c3bdf30 | 1805 | { |
3e81d9f9 HPN |
1806 | /* We can't get here for other cases. */ |
1807 | gas_assert (n_operands <= 3); | |
1808 | ||
1809 | /* The meaning of operands to TRIP and TRAP is not defined (and | |
1810 | SWYM operands aren't enforced in mmixal, so let's avoid | |
1811 | that). We add combinations not handled above here as we find | |
1812 | them and as they're reported. */ | |
3c3bdf30 NC |
1813 | if (n_operands == 3) |
1814 | { | |
1815 | /* Don't require non-register operands. Always generate | |
1816 | fixups, so we don't have to copy lots of code and create | |
67c1ffbe | 1817 | maintenance problems. TRIP is supposed to be a rare |
3c3bdf30 NC |
1818 | instruction, so the overhead should not matter. We |
1819 | aren't allowed to fix_new_exp for an expression which is | |
3e81d9f9 HPN |
1820 | an O_register at this point, however. |
1821 | ||
1822 | Don't use BFD_RELOC_MMIX_REG_OR_BYTE as that modifies | |
1823 | the insn for a register in the Z field and we want | |
1824 | consistency. */ | |
3c3bdf30 NC |
1825 | if (exp[0].X_op == O_register) |
1826 | opcodep[1] = exp[0].X_add_number; | |
1827 | else | |
1828 | fix_new_exp (opc_fragP, opcodep - opc_fragP->fr_literal + 1, | |
3e81d9f9 | 1829 | 1, exp, 0, BFD_RELOC_8); |
3c3bdf30 NC |
1830 | if (exp[1].X_op == O_register) |
1831 | opcodep[2] = exp[1].X_add_number; | |
1832 | else | |
1833 | fix_new_exp (opc_fragP, opcodep - opc_fragP->fr_literal + 2, | |
3e81d9f9 | 1834 | 1, exp + 1, 0, BFD_RELOC_8); |
3c3bdf30 NC |
1835 | if (exp[2].X_op == O_register) |
1836 | opcodep[3] = exp[2].X_add_number; | |
1837 | else | |
1838 | fix_new_exp (opc_fragP, opcodep - opc_fragP->fr_literal + 3, | |
3e81d9f9 | 1839 | 1, exp + 2, 0, BFD_RELOC_8); |
3c3bdf30 NC |
1840 | } |
1841 | else if (n_operands == 2) | |
1842 | { | |
1843 | if (exp[0].X_op == O_register) | |
3e81d9f9 | 1844 | opcodep[1] = exp[0].X_add_number; |
3c3bdf30 | 1845 | else |
3e81d9f9 HPN |
1846 | fix_new_exp (opc_fragP, opcodep - opc_fragP->fr_literal + 1, |
1847 | 1, exp, 0, BFD_RELOC_8); | |
3c3bdf30 NC |
1848 | if (exp[1].X_op == O_register) |
1849 | opcodep[3] = exp[1].X_add_number; | |
1850 | else | |
3e81d9f9 HPN |
1851 | fix_new_exp (opc_fragP, opcodep - opc_fragP->fr_literal + 2, |
1852 | 2, exp + 1, 0, BFD_RELOC_16); | |
3c3bdf30 NC |
1853 | } |
1854 | else | |
1855 | { | |
3e81d9f9 HPN |
1856 | /* We can't get here for other cases. */ |
1857 | gas_assert (n_operands == 1 && exp[0].X_op == O_register); | |
1858 | ||
1859 | opcodep[3] = exp[0].X_add_number; | |
3c3bdf30 NC |
1860 | } |
1861 | } | |
3c3bdf30 NC |
1862 | break; |
1863 | ||
1864 | case mmix_operands_resume: | |
1865 | if (n_operands == 0 && ! mmix_gnu_syntax) | |
1866 | break; | |
1867 | ||
1868 | if (n_operands != 1 | |
1869 | || exp[0].X_op == O_register | |
1870 | || (exp[0].X_op == O_constant | |
1871 | && (exp[0].X_add_number < 0 | |
1872 | || exp[0].X_add_number > 255))) | |
1873 | { | |
1874 | as_bad (_("invalid operands to opcode %s: `%s'"), | |
1875 | instruction->name, operands); | |
1876 | return; | |
1877 | } | |
1878 | ||
1879 | if (exp[0].X_op == O_constant) | |
1880 | opcodep[3] = exp[0].X_add_number; | |
1881 | else | |
1882 | fix_new_exp (opc_fragP, opcodep - opc_fragP->fr_literal + 3, | |
1883 | 1, exp + 0, 0, BFD_RELOC_8); | |
1884 | break; | |
1885 | ||
1886 | case mmix_operands_pushj: | |
1887 | /* All is done for PUSHJ already. */ | |
1888 | break; | |
1889 | ||
1890 | default: | |
1891 | BAD_CASE (instruction->operands); | |
1892 | } | |
1893 | } | |
1894 | ||
1895 | /* For the benefit of insns that start with a digit, we assemble by way of | |
1896 | tc_unrecognized_line too, through this function. */ | |
1897 | ||
1898 | int | |
ff1e783f | 1899 | mmix_assemble_return_nonzero (char *str) |
3c3bdf30 NC |
1900 | { |
1901 | int last_error_count = had_errors (); | |
1902 | char *s2 = str; | |
1903 | char c; | |
1904 | ||
1905 | /* Normal instruction handling downcases, so we must too. */ | |
1906 | while (ISALNUM (*s2)) | |
1907 | { | |
1908 | if (ISUPPER ((unsigned char) *s2)) | |
1909 | *s2 = TOLOWER (*s2); | |
1910 | s2++; | |
1911 | } | |
1912 | ||
1913 | /* Cut the line for sake of the assembly. */ | |
1914 | for (s2 = str; *s2 && *s2 != '\n'; s2++) | |
1915 | ; | |
1916 | ||
1917 | c = *s2; | |
1918 | *s2 = 0; | |
1919 | md_assemble (str); | |
1920 | *s2 = c; | |
1921 | ||
1922 | return had_errors () == last_error_count; | |
1923 | } | |
1924 | ||
1925 | /* The PREFIX pseudo. */ | |
1926 | ||
1927 | static void | |
ff1e783f | 1928 | s_prefix (int unused ATTRIBUTE_UNUSED) |
3c3bdf30 NC |
1929 | { |
1930 | char *p; | |
1931 | int c; | |
1932 | ||
1933 | SKIP_WHITESPACE (); | |
1934 | ||
1935 | p = input_line_pointer; | |
1936 | ||
1937 | c = get_symbol_end (); | |
1938 | ||
1939 | /* Reseting prefix? */ | |
1940 | if (*p == ':' && p[1] == 0) | |
1941 | mmix_current_prefix = NULL; | |
1942 | else | |
1943 | { | |
1944 | /* Put this prefix on the mmix symbols obstack. We could malloc and | |
1945 | free it separately, but then we'd have to worry about that. | |
1946 | People using up memory on prefixes have other problems. */ | |
1947 | obstack_grow (&mmix_sym_obstack, p, strlen (p) + 1); | |
1948 | p = obstack_finish (&mmix_sym_obstack); | |
1949 | ||
1950 | /* Accumulate prefixes, and strip a leading ':'. */ | |
1951 | if (mmix_current_prefix != NULL || *p == ':') | |
1952 | p = mmix_prefix_name (p); | |
1953 | ||
1954 | mmix_current_prefix = p; | |
1955 | } | |
1956 | ||
1957 | *input_line_pointer = c; | |
1958 | ||
1959 | mmix_handle_rest_of_empty_line (); | |
1960 | } | |
1961 | ||
1962 | /* We implement prefixes by using the tc_canonicalize_symbol_name hook, | |
1963 | and store each prefixed name on a (separate) obstack. This means that | |
1964 | the name is on the "notes" obstack in non-prefixed form and on the | |
1965 | mmix_sym_obstack in prefixed form, but currently it is not worth | |
1966 | rewriting the whole GAS symbol handling to improve "hooking" to avoid | |
1967 | that. (It might be worth a rewrite for other reasons, though). */ | |
1968 | ||
1969 | char * | |
ff1e783f | 1970 | mmix_prefix_name (char *shortname) |
3c3bdf30 NC |
1971 | { |
1972 | if (*shortname == ':') | |
1973 | return shortname + 1; | |
1974 | ||
1975 | if (mmix_current_prefix == NULL) | |
1976 | as_fatal (_("internal: mmix_prefix_name but empty prefix")); | |
1977 | ||
1978 | if (*shortname == '$') | |
1979 | return shortname; | |
1980 | ||
1981 | obstack_grow (&mmix_sym_obstack, mmix_current_prefix, | |
1982 | strlen (mmix_current_prefix)); | |
1983 | obstack_grow (&mmix_sym_obstack, shortname, strlen (shortname) + 1); | |
1984 | return obstack_finish (&mmix_sym_obstack); | |
1985 | } | |
1986 | ||
1987 | /* The GREG pseudo. At LABEL, we have the name of a symbol that we | |
1988 | want to make a register symbol, and which should be initialized with | |
1989 | the value in the expression at INPUT_LINE_POINTER (defaulting to 0). | |
1990 | Either and (perhaps less meaningful) both may be missing. LABEL must | |
1991 | be persistent, perhaps allocated on an obstack. */ | |
1992 | ||
1993 | static void | |
ff1e783f | 1994 | mmix_greg_internal (char *label) |
3c3bdf30 NC |
1995 | { |
1996 | expressionS *expP = &mmix_raw_gregs[n_of_raw_gregs].exp; | |
1997 | ||
1998 | /* Don't set the section to register contents section before the | |
1999 | expression has been parsed; it may refer to the current position. */ | |
2000 | expression (expP); | |
2001 | ||
2002 | /* FIXME: Check that no expression refers to the register contents | |
2003 | section. May need to be done in elf64-mmix.c. */ | |
2004 | if (expP->X_op == O_absent) | |
2005 | { | |
2006 | /* Default to zero if the expression was absent. */ | |
2007 | expP->X_op = O_constant; | |
2008 | expP->X_add_number = 0; | |
2009 | expP->X_unsigned = 0; | |
2010 | expP->X_add_symbol = NULL; | |
2011 | expP->X_op_symbol = NULL; | |
2012 | } | |
2013 | ||
2014 | /* We must handle prefixes here, as we save the labels and expressions | |
2015 | to be output later. */ | |
2016 | mmix_raw_gregs[n_of_raw_gregs].label | |
2017 | = mmix_current_prefix == NULL ? label : mmix_prefix_name (label); | |
2018 | ||
2019 | if (n_of_raw_gregs == MAX_GREGS - 1) | |
2020 | as_bad (_("too many GREG registers allocated (max %d)"), MAX_GREGS); | |
2021 | else | |
2022 | n_of_raw_gregs++; | |
2023 | ||
2024 | mmix_handle_rest_of_empty_line (); | |
2025 | } | |
2026 | ||
2027 | /* The ".greg label,expr" worker. */ | |
2028 | ||
2029 | static void | |
ff1e783f | 2030 | s_greg (int unused ATTRIBUTE_UNUSED) |
3c3bdf30 NC |
2031 | { |
2032 | char *p; | |
2033 | char c; | |
2034 | p = input_line_pointer; | |
2035 | ||
2036 | /* This will skip over what can be a symbol and zero out the next | |
2037 | character, which we assume is a ',' or other meaningful delimiter. | |
2038 | What comes after that is the initializer expression for the | |
2039 | register. */ | |
2040 | c = get_symbol_end (); | |
2041 | ||
a1b6236b | 2042 | if (! is_end_of_line[(unsigned char) c]) |
3c3bdf30 NC |
2043 | input_line_pointer++; |
2044 | ||
2045 | if (*p) | |
2046 | { | |
2047 | /* The label must be persistent; it's not used until after all input | |
2048 | has been seen. */ | |
2049 | obstack_grow (&mmix_sym_obstack, p, strlen (p) + 1); | |
2050 | mmix_greg_internal (obstack_finish (&mmix_sym_obstack)); | |
2051 | } | |
2052 | else | |
2053 | mmix_greg_internal (NULL); | |
2054 | } | |
2055 | ||
2056 | /* The "BSPEC expr" worker. */ | |
2057 | ||
2058 | static void | |
ff1e783f | 2059 | s_bspec (int unused ATTRIBUTE_UNUSED) |
3c3bdf30 NC |
2060 | { |
2061 | asection *expsec; | |
2062 | asection *sec; | |
2063 | char secname[sizeof (MMIX_OTHER_SPEC_SECTION_PREFIX) + 20] | |
2064 | = MMIX_OTHER_SPEC_SECTION_PREFIX; | |
2065 | expressionS exp; | |
2066 | int n; | |
2067 | ||
2068 | /* Get a constant expression which we can evaluate *now*. Supporting | |
2069 | more complex (though assembly-time computable) expressions is | |
2070 | feasible but Too Much Work for something of unknown usefulness like | |
2071 | BSPEC-ESPEC. */ | |
2072 | expsec = expression (&exp); | |
2073 | mmix_handle_rest_of_empty_line (); | |
2074 | ||
2075 | /* Check that we don't have another BSPEC in progress. */ | |
2076 | if (doing_bspec) | |
2077 | { | |
2078 | as_bad (_("BSPEC already active. Nesting is not supported.")); | |
2079 | return; | |
2080 | } | |
2081 | ||
2082 | if (exp.X_op != O_constant | |
2083 | || expsec != absolute_section | |
2084 | || exp.X_add_number < 0 | |
2085 | || exp.X_add_number > 65535) | |
2086 | { | |
2087 | as_bad (_("invalid BSPEC expression")); | |
2088 | exp.X_add_number = 0; | |
2089 | } | |
2090 | ||
2091 | n = (int) exp.X_add_number; | |
2092 | ||
2093 | sprintf (secname + strlen (MMIX_OTHER_SPEC_SECTION_PREFIX), "%d", n); | |
2094 | sec = bfd_get_section_by_name (stdoutput, secname); | |
2095 | if (sec == NULL) | |
2096 | { | |
2097 | /* We need a non-volatile name as it will be stored in the section | |
2098 | struct. */ | |
2099 | char *newsecname = xstrdup (secname); | |
2100 | sec = bfd_make_section (stdoutput, newsecname); | |
2101 | ||
2102 | if (sec == NULL) | |
2103 | as_fatal (_("can't create section %s"), newsecname); | |
2104 | ||
2105 | if (!bfd_set_section_flags (stdoutput, sec, | |
2106 | bfd_get_section_flags (stdoutput, sec) | |
2107 | | SEC_READONLY)) | |
2108 | as_fatal (_("can't set section flags for section %s"), newsecname); | |
2109 | } | |
2110 | ||
2111 | /* Tell ELF about the pending section change. */ | |
2112 | obj_elf_section_change_hook (); | |
2113 | subseg_set (sec, 0); | |
2114 | ||
2115 | /* Save position for missing ESPEC. */ | |
2116 | as_where (&bspec_file, &bspec_line); | |
2117 | ||
2118 | doing_bspec = 1; | |
2119 | } | |
2120 | ||
2121 | /* The "ESPEC" worker. */ | |
2122 | ||
2123 | static void | |
ff1e783f | 2124 | s_espec (int unused ATTRIBUTE_UNUSED) |
3c3bdf30 NC |
2125 | { |
2126 | /* First, check that we *do* have a BSPEC in progress. */ | |
2127 | if (! doing_bspec) | |
2128 | { | |
2129 | as_bad (_("ESPEC without preceding BSPEC")); | |
2130 | return; | |
2131 | } | |
2132 | ||
2133 | mmix_handle_rest_of_empty_line (); | |
2134 | doing_bspec = 0; | |
2135 | ||
2136 | /* When we told ELF about the section change in s_bspec, it stored the | |
2137 | previous section for us so we can get at it with the equivalent of a | |
2138 | .previous pseudo. */ | |
2139 | obj_elf_previous (0); | |
2140 | } | |
2141 | ||
2142 | /* The " .local expr" and " local expr" worker. We make a BFD_MMIX_LOCAL | |
2143 | relocation against the current position against the expression. | |
2144 | Implementing this by means of contents in a section lost. */ | |
2145 | ||
2146 | static void | |
ff1e783f | 2147 | mmix_s_local (int unused ATTRIBUTE_UNUSED) |
3c3bdf30 NC |
2148 | { |
2149 | expressionS exp; | |
2150 | ||
2151 | /* Don't set the section to register contents section before the | |
2152 | expression has been parsed; it may refer to the current position in | |
2153 | some contorted way. */ | |
2154 | expression (&exp); | |
2155 | ||
2156 | if (exp.X_op == O_absent) | |
2157 | { | |
2158 | as_bad (_("missing local expression")); | |
2159 | return; | |
2160 | } | |
2161 | else if (exp.X_op == O_register) | |
2162 | { | |
2163 | /* fix_new_exp doesn't like O_register. Should be configurable. | |
2164 | We're fine with a constant here, though. */ | |
2165 | exp.X_op = O_constant; | |
2166 | } | |
2167 | ||
2168 | fix_new_exp (frag_now, 0, 0, &exp, 0, BFD_RELOC_MMIX_LOCAL); | |
2169 | mmix_handle_rest_of_empty_line (); | |
2170 | } | |
2171 | ||
2172 | /* Set fragP->fr_var to the initial guess of the size of a relaxable insn | |
2173 | and return it. Sizes of other instructions are not known. This | |
2174 | function may be called multiple times. */ | |
2175 | ||
2176 | int | |
ff1e783f | 2177 | md_estimate_size_before_relax (fragS *fragP, segT segment) |
3c3bdf30 NC |
2178 | { |
2179 | int length; | |
2180 | ||
2181 | #define HANDLE_RELAXABLE(state) \ | |
2182 | case ENCODE_RELAX (state, STATE_UNDF): \ | |
2183 | if (fragP->fr_symbol != NULL \ | |
2be11e7e HPN |
2184 | && S_GET_SEGMENT (fragP->fr_symbol) == segment \ |
2185 | && !S_IS_WEAK (fragP->fr_symbol)) \ | |
3c3bdf30 NC |
2186 | { \ |
2187 | /* The symbol lies in the same segment - a relaxable case. */ \ | |
2188 | fragP->fr_subtype \ | |
2189 | = ENCODE_RELAX (state, STATE_ZERO); \ | |
2190 | } \ | |
2191 | break; | |
2192 | ||
2193 | switch (fragP->fr_subtype) | |
2194 | { | |
2195 | HANDLE_RELAXABLE (STATE_GETA); | |
2196 | HANDLE_RELAXABLE (STATE_BCC); | |
3c3bdf30 NC |
2197 | HANDLE_RELAXABLE (STATE_JMP); |
2198 | ||
88fc725d HPN |
2199 | case ENCODE_RELAX (STATE_PUSHJ, STATE_UNDF): |
2200 | if (fragP->fr_symbol != NULL | |
2201 | && S_GET_SEGMENT (fragP->fr_symbol) == segment | |
2202 | && !S_IS_WEAK (fragP->fr_symbol)) | |
2203 | /* The symbol lies in the same segment - a relaxable case. */ | |
2204 | fragP->fr_subtype = ENCODE_RELAX (STATE_PUSHJ, STATE_ZERO); | |
2205 | else if (pushj_stubs) | |
2206 | /* If we're to generate stubs, assume we can reach a stub after | |
2207 | the section. */ | |
2208 | fragP->fr_subtype = ENCODE_RELAX (STATE_PUSHJSTUB, STATE_ZERO); | |
2209 | /* FALLTHROUGH. */ | |
2210 | case ENCODE_RELAX (STATE_PUSHJ, STATE_ZERO): | |
2211 | case ENCODE_RELAX (STATE_PUSHJSTUB, STATE_ZERO): | |
2212 | /* We need to distinguish different relaxation rounds. */ | |
2213 | seg_info (segment)->tc_segment_info_data.last_stubfrag = fragP; | |
2214 | break; | |
2215 | ||
3c3bdf30 NC |
2216 | case ENCODE_RELAX (STATE_GETA, STATE_ZERO): |
2217 | case ENCODE_RELAX (STATE_BCC, STATE_ZERO): | |
3c3bdf30 NC |
2218 | case ENCODE_RELAX (STATE_JMP, STATE_ZERO): |
2219 | /* When relaxing a section for the second time, we don't need to do | |
2220 | anything except making sure that fr_var is set right. */ | |
2221 | break; | |
2222 | ||
2223 | case STATE_GREG_DEF: | |
2224 | length = fragP->tc_frag_data != NULL ? 0 : 8; | |
2225 | fragP->fr_var = length; | |
2226 | ||
2227 | /* Don't consult the relax_table; it isn't valid for this | |
2228 | relaxation. */ | |
2229 | return length; | |
2230 | break; | |
2231 | ||
2232 | default: | |
2233 | BAD_CASE (fragP->fr_subtype); | |
2234 | } | |
2235 | ||
2236 | length = mmix_relax_table[fragP->fr_subtype].rlx_length; | |
2237 | fragP->fr_var = length; | |
2238 | ||
2239 | return length; | |
2240 | } | |
2241 | ||
2242 | /* Turn a string in input_line_pointer into a floating point constant of type | |
2243 | type, and store the appropriate bytes in *litP. The number of LITTLENUMS | |
2244 | emitted is stored in *sizeP . An error message is returned, or NULL on | |
2245 | OK. */ | |
2246 | ||
2247 | char * | |
ff1e783f | 2248 | md_atof (int type, char *litP, int *sizeP) |
3c3bdf30 | 2249 | { |
499ac353 NC |
2250 | if (type == 'r') |
2251 | type = 'f'; | |
2252 | /* FIXME: Having 'f' in mmix_flt_chars (and here) makes it | |
2253 | problematic to also have a forward reference in an expression. | |
2254 | The testsuite wants it, and it's customary. | |
2255 | We'll deal with the real problems when they come; we share the | |
2256 | problem with most other ports. */ | |
2257 | return ieee_md_atof (type, litP, sizeP, TRUE); | |
3c3bdf30 NC |
2258 | } |
2259 | ||
2260 | /* Convert variable-sized frags into one or more fixups. */ | |
2261 | ||
2262 | void | |
ff1e783f HPN |
2263 | md_convert_frag (bfd *abfd ATTRIBUTE_UNUSED, segT sec ATTRIBUTE_UNUSED, |
2264 | fragS *fragP) | |
3c3bdf30 | 2265 | { |
a1b6236b | 2266 | /* Pointer to first byte in variable-sized part of the frag. */ |
3c3bdf30 NC |
2267 | char *var_partp; |
2268 | ||
2269 | /* Pointer to first opcode byte in frag. */ | |
2270 | char *opcodep; | |
2271 | ||
2272 | /* Size in bytes of variable-sized part of frag. */ | |
2273 | int var_part_size = 0; | |
2274 | ||
2275 | /* This is part of *fragP. It contains all information about addresses | |
2276 | and offsets to varying parts. */ | |
2277 | symbolS *symbolP; | |
2278 | unsigned long var_part_offset; | |
2279 | ||
2280 | /* This is the frag for the opcode. It, rather than fragP, must be used | |
2281 | when emitting a frag for the opcode. */ | |
2282 | fragS *opc_fragP = fragP->tc_frag_data; | |
2283 | fixS *tmpfixP; | |
2284 | ||
2285 | /* Where, in file space, does addr point? */ | |
2286 | bfd_vma target_address; | |
2287 | bfd_vma opcode_address; | |
2288 | ||
2289 | know (fragP->fr_type == rs_machine_dependent); | |
2290 | ||
2291 | var_part_offset = fragP->fr_fix; | |
2292 | var_partp = fragP->fr_literal + var_part_offset; | |
2293 | opcodep = fragP->fr_opcode; | |
2294 | ||
2295 | symbolP = fragP->fr_symbol; | |
2296 | ||
2297 | target_address | |
2298 | = ((symbolP ? S_GET_VALUE (symbolP) : 0) + fragP->fr_offset); | |
2299 | ||
2300 | /* The opcode that would be extended is the last four "fixed" bytes. */ | |
2301 | opcode_address = fragP->fr_address + fragP->fr_fix - 4; | |
2302 | ||
2303 | switch (fragP->fr_subtype) | |
a1b6236b | 2304 | { |
88fc725d HPN |
2305 | case ENCODE_RELAX (STATE_PUSHJSTUB, STATE_ZERO): |
2306 | /* Setting the unknown bits to 0 seems the most appropriate. */ | |
2307 | mmix_set_geta_branch_offset (opcodep, 0); | |
2308 | tmpfixP = fix_new (opc_fragP, opcodep - opc_fragP->fr_literal, 8, | |
2309 | fragP->fr_symbol, fragP->fr_offset, 1, | |
2310 | BFD_RELOC_MMIX_PUSHJ_STUBBABLE); | |
2311 | COPY_FR_WHERE_TO_FX (fragP, tmpfixP); | |
2312 | var_part_size = 0; | |
2313 | break; | |
2314 | ||
a1b6236b KH |
2315 | case ENCODE_RELAX (STATE_GETA, STATE_ZERO): |
2316 | case ENCODE_RELAX (STATE_BCC, STATE_ZERO): | |
2317 | case ENCODE_RELAX (STATE_PUSHJ, STATE_ZERO): | |
2318 | mmix_set_geta_branch_offset (opcodep, target_address - opcode_address); | |
2319 | if (linkrelax) | |
2320 | { | |
2321 | tmpfixP | |
2322 | = fix_new (opc_fragP, opcodep - opc_fragP->fr_literal, 4, | |
2323 | fragP->fr_symbol, fragP->fr_offset, 1, | |
2324 | BFD_RELOC_MMIX_ADDR19); | |
2325 | COPY_FR_WHERE_TO_FX (fragP, tmpfixP); | |
2326 | } | |
2327 | var_part_size = 0; | |
2328 | break; | |
3c3bdf30 | 2329 | |
a1b6236b KH |
2330 | case ENCODE_RELAX (STATE_JMP, STATE_ZERO): |
2331 | mmix_set_jmp_offset (opcodep, target_address - opcode_address); | |
2332 | if (linkrelax) | |
2333 | { | |
2334 | tmpfixP | |
2335 | = fix_new (opc_fragP, opcodep - opc_fragP->fr_literal, 4, | |
2336 | fragP->fr_symbol, fragP->fr_offset, 1, | |
2337 | BFD_RELOC_MMIX_ADDR27); | |
2338 | COPY_FR_WHERE_TO_FX (fragP, tmpfixP); | |
2339 | } | |
3c3bdf30 | 2340 | var_part_size = 0; |
a1b6236b KH |
2341 | break; |
2342 | ||
2343 | case STATE_GREG_DEF: | |
2344 | if (fragP->tc_frag_data == NULL) | |
2345 | { | |
32c27eed | 2346 | /* We must initialize data that's supposed to be "fixed up" to |
55cf6793 | 2347 | avoid emitting garbage, because md_apply_fix won't do |
32c27eed HPN |
2348 | anything for undefined symbols. */ |
2349 | md_number_to_chars (var_partp, 0, 8); | |
a1b6236b KH |
2350 | tmpfixP |
2351 | = fix_new (fragP, var_partp - fragP->fr_literal, 8, | |
2352 | fragP->fr_symbol, fragP->fr_offset, 0, BFD_RELOC_64); | |
2353 | COPY_FR_WHERE_TO_FX (fragP, tmpfixP); | |
2354 | mmix_gregs[n_of_cooked_gregs++] = tmpfixP; | |
2355 | var_part_size = 8; | |
2356 | } | |
2357 | else | |
2358 | var_part_size = 0; | |
2359 | break; | |
3c3bdf30 NC |
2360 | |
2361 | #define HANDLE_MAX_RELOC(state, reloc) \ | |
2362 | case ENCODE_RELAX (state, STATE_MAX): \ | |
2363 | var_part_size \ | |
2364 | = mmix_relax_table[ENCODE_RELAX (state, STATE_MAX)].rlx_length; \ | |
2365 | mmix_fill_nops (var_partp, var_part_size / 4); \ | |
2366 | if (warn_on_expansion) \ | |
2367 | as_warn_where (fragP->fr_file, fragP->fr_line, \ | |
2368 | _("operand out of range, instruction expanded")); \ | |
2369 | tmpfixP = fix_new (fragP, var_partp - fragP->fr_literal - 4, 8, \ | |
2370 | fragP->fr_symbol, fragP->fr_offset, 1, reloc); \ | |
2371 | COPY_FR_WHERE_TO_FX (fragP, tmpfixP); \ | |
2372 | break | |
2373 | ||
a1b6236b KH |
2374 | HANDLE_MAX_RELOC (STATE_GETA, BFD_RELOC_MMIX_GETA); |
2375 | HANDLE_MAX_RELOC (STATE_BCC, BFD_RELOC_MMIX_CBRANCH); | |
2376 | HANDLE_MAX_RELOC (STATE_PUSHJ, BFD_RELOC_MMIX_PUSHJ); | |
2377 | HANDLE_MAX_RELOC (STATE_JMP, BFD_RELOC_MMIX_JMP); | |
3c3bdf30 | 2378 | |
a1b6236b KH |
2379 | default: |
2380 | BAD_CASE (fragP->fr_subtype); | |
2381 | break; | |
2382 | } | |
3c3bdf30 NC |
2383 | |
2384 | fragP->fr_fix += var_part_size; | |
2385 | fragP->fr_var = 0; | |
2386 | } | |
2387 | ||
2388 | /* Applies the desired value to the specified location. | |
2389 | Also sets up addends for RELA type relocations. | |
2390 | Stolen from tc-mcore.c. | |
2391 | ||
2392 | Note that this function isn't called when linkrelax != 0. */ | |
2393 | ||
94f592af | 2394 | void |
55cf6793 | 2395 | md_apply_fix (fixS *fixP, valueT *valP, segT segment) |
3c3bdf30 NC |
2396 | { |
2397 | char *buf = fixP->fx_where + fixP->fx_frag->fr_literal; | |
2398 | /* Note: use offsetT because it is signed, valueT is unsigned. */ | |
94f592af | 2399 | offsetT val = (offsetT) * valP; |
3c3bdf30 NC |
2400 | segT symsec |
2401 | = (fixP->fx_addsy == NULL | |
2402 | ? absolute_section : S_GET_SEGMENT (fixP->fx_addsy)); | |
2403 | ||
2404 | /* If the fix is relative to a symbol which is not defined, or, (if | |
2405 | pcrel), not in the same segment as the fix, we cannot resolve it | |
2406 | here. */ | |
2407 | if (fixP->fx_addsy != NULL | |
2408 | && (! S_IS_DEFINED (fixP->fx_addsy) | |
2409 | || S_IS_WEAK (fixP->fx_addsy) | |
2410 | || (fixP->fx_pcrel && symsec != segment) | |
2411 | || (! fixP->fx_pcrel | |
2412 | && symsec != absolute_section | |
2413 | && ((fixP->fx_r_type != BFD_RELOC_MMIX_REG | |
2414 | && fixP->fx_r_type != BFD_RELOC_MMIX_REG_OR_BYTE) | |
a161fe53 | 2415 | || symsec != reg_section)))) |
3c3bdf30 NC |
2416 | { |
2417 | fixP->fx_done = 0; | |
94f592af | 2418 | return; |
3c3bdf30 NC |
2419 | } |
2420 | else if (fixP->fx_r_type == BFD_RELOC_MMIX_LOCAL | |
2421 | || fixP->fx_r_type == BFD_RELOC_VTABLE_INHERIT | |
2422 | || fixP->fx_r_type == BFD_RELOC_VTABLE_ENTRY) | |
2423 | { | |
2424 | /* These are never "fixed". */ | |
2425 | fixP->fx_done = 0; | |
94f592af | 2426 | return; |
3c3bdf30 NC |
2427 | } |
2428 | else | |
2429 | /* We assume every other relocation is "fixed". */ | |
2430 | fixP->fx_done = 1; | |
2431 | ||
2432 | switch (fixP->fx_r_type) | |
2433 | { | |
2434 | case BFD_RELOC_64: | |
2435 | case BFD_RELOC_32: | |
2436 | case BFD_RELOC_24: | |
2437 | case BFD_RELOC_16: | |
2438 | case BFD_RELOC_8: | |
2439 | case BFD_RELOC_64_PCREL: | |
2440 | case BFD_RELOC_32_PCREL: | |
2441 | case BFD_RELOC_24_PCREL: | |
2442 | case BFD_RELOC_16_PCREL: | |
2443 | case BFD_RELOC_8_PCREL: | |
2444 | md_number_to_chars (buf, val, fixP->fx_size); | |
2445 | break; | |
2446 | ||
2447 | case BFD_RELOC_MMIX_ADDR19: | |
2448 | if (expand_op) | |
2449 | { | |
2450 | /* This shouldn't happen. */ | |
2451 | BAD_CASE (fixP->fx_r_type); | |
2452 | break; | |
2453 | } | |
2454 | /* FALLTHROUGH. */ | |
2455 | case BFD_RELOC_MMIX_GETA: | |
2456 | case BFD_RELOC_MMIX_CBRANCH: | |
2457 | case BFD_RELOC_MMIX_PUSHJ: | |
88fc725d | 2458 | case BFD_RELOC_MMIX_PUSHJ_STUBBABLE: |
3c3bdf30 NC |
2459 | /* If this fixup is out of range, punt to the linker to emit an |
2460 | error. This should only happen with -no-expand. */ | |
2461 | if (val < -(((offsetT) 1 << 19)/2) | |
2462 | || val >= ((offsetT) 1 << 19)/2 - 1 | |
2463 | || (val & 3) != 0) | |
2464 | { | |
2465 | if (warn_on_expansion) | |
2466 | as_warn_where (fixP->fx_file, fixP->fx_line, | |
2467 | _("operand out of range")); | |
2468 | fixP->fx_done = 0; | |
2469 | val = 0; | |
2470 | } | |
2471 | mmix_set_geta_branch_offset (buf, val); | |
2472 | break; | |
2473 | ||
2474 | case BFD_RELOC_MMIX_ADDR27: | |
2475 | if (expand_op) | |
2476 | { | |
2477 | /* This shouldn't happen. */ | |
2478 | BAD_CASE (fixP->fx_r_type); | |
2479 | break; | |
2480 | } | |
2481 | /* FALLTHROUGH. */ | |
2482 | case BFD_RELOC_MMIX_JMP: | |
2483 | /* If this fixup is out of range, punt to the linker to emit an | |
2484 | error. This should only happen with -no-expand. */ | |
2485 | if (val < -(((offsetT) 1 << 27)/2) | |
2486 | || val >= ((offsetT) 1 << 27)/2 - 1 | |
2487 | || (val & 3) != 0) | |
2488 | { | |
2489 | if (warn_on_expansion) | |
2490 | as_warn_where (fixP->fx_file, fixP->fx_line, | |
2491 | _("operand out of range")); | |
2492 | fixP->fx_done = 0; | |
2493 | val = 0; | |
2494 | } | |
2495 | mmix_set_jmp_offset (buf, val); | |
2496 | break; | |
2497 | ||
2498 | case BFD_RELOC_MMIX_REG_OR_BYTE: | |
2499 | if (fixP->fx_addsy != NULL | |
a161fe53 | 2500 | && (S_GET_SEGMENT (fixP->fx_addsy) != reg_section |
3c3bdf30 NC |
2501 | || S_GET_VALUE (fixP->fx_addsy) > 255) |
2502 | && S_GET_SEGMENT (fixP->fx_addsy) != absolute_section) | |
a161fe53 AM |
2503 | { |
2504 | as_bad_where (fixP->fx_file, fixP->fx_line, | |
2505 | _("invalid operands")); | |
2506 | /* We don't want this "symbol" appearing in output, because | |
2507 | that will fail. */ | |
2508 | fixP->fx_done = 1; | |
2509 | } | |
2510 | ||
3c3bdf30 NC |
2511 | buf[0] = val; |
2512 | ||
2513 | /* If this reloc is for a Z field, we need to adjust | |
2514 | the opcode if we got a constant here. | |
2515 | FIXME: Can we make this more robust? */ | |
2516 | ||
2517 | if ((fixP->fx_where & 3) == 3 | |
2518 | && (fixP->fx_addsy == NULL | |
2519 | || S_GET_SEGMENT (fixP->fx_addsy) == absolute_section)) | |
2520 | buf[-3] |= IMM_OFFSET_BIT; | |
3c3bdf30 NC |
2521 | break; |
2522 | ||
2523 | case BFD_RELOC_MMIX_REG: | |
2524 | if (fixP->fx_addsy == NULL | |
a161fe53 | 2525 | || S_GET_SEGMENT (fixP->fx_addsy) != reg_section |
3c3bdf30 | 2526 | || S_GET_VALUE (fixP->fx_addsy) > 255) |
a161fe53 AM |
2527 | { |
2528 | as_bad_where (fixP->fx_file, fixP->fx_line, | |
2529 | _("invalid operands")); | |
2530 | fixP->fx_done = 1; | |
2531 | } | |
3c3bdf30 | 2532 | |
a161fe53 | 2533 | *buf = val; |
3c3bdf30 NC |
2534 | break; |
2535 | ||
2536 | case BFD_RELOC_MMIX_BASE_PLUS_OFFSET: | |
2537 | /* These are never "fixed". */ | |
2538 | fixP->fx_done = 0; | |
94f592af | 2539 | return; |
3c3bdf30 NC |
2540 | |
2541 | case BFD_RELOC_MMIX_PUSHJ_1: | |
2542 | case BFD_RELOC_MMIX_PUSHJ_2: | |
2543 | case BFD_RELOC_MMIX_PUSHJ_3: | |
2544 | case BFD_RELOC_MMIX_CBRANCH_J: | |
2545 | case BFD_RELOC_MMIX_CBRANCH_1: | |
2546 | case BFD_RELOC_MMIX_CBRANCH_2: | |
2547 | case BFD_RELOC_MMIX_CBRANCH_3: | |
2548 | case BFD_RELOC_MMIX_GETA_1: | |
2549 | case BFD_RELOC_MMIX_GETA_2: | |
2550 | case BFD_RELOC_MMIX_GETA_3: | |
2551 | case BFD_RELOC_MMIX_JMP_1: | |
2552 | case BFD_RELOC_MMIX_JMP_2: | |
2553 | case BFD_RELOC_MMIX_JMP_3: | |
2554 | default: | |
2555 | BAD_CASE (fixP->fx_r_type); | |
2556 | break; | |
2557 | } | |
2558 | ||
2559 | if (fixP->fx_done) | |
2560 | /* Make sure that for completed fixups we have the value around for | |
2561 | use by e.g. mmix_frob_file. */ | |
2562 | fixP->fx_offset = val; | |
3c3bdf30 NC |
2563 | } |
2564 | ||
2565 | /* A bsearch function for looking up a value against offsets for GREG | |
2566 | definitions. */ | |
2567 | ||
2568 | static int | |
ff1e783f | 2569 | cmp_greg_val_greg_symbol_fixes (const void *p1, const void *p2) |
3c3bdf30 NC |
2570 | { |
2571 | offsetT val1 = *(offsetT *) p1; | |
2572 | offsetT val2 = ((struct mmix_symbol_greg_fixes *) p2)->offs; | |
2573 | ||
2574 | if (val1 >= val2 && val1 < val2 + 255) | |
2575 | return 0; | |
2576 | ||
2577 | if (val1 > val2) | |
2578 | return 1; | |
2579 | ||
2580 | return -1; | |
2581 | } | |
2582 | ||
2583 | /* Generate a machine-dependent relocation. */ | |
2584 | ||
2585 | arelent * | |
ff1e783f | 2586 | tc_gen_reloc (asection *section ATTRIBUTE_UNUSED, fixS *fixP) |
3c3bdf30 NC |
2587 | { |
2588 | bfd_signed_vma val | |
5459d7a0 HPN |
2589 | = fixP->fx_offset |
2590 | + (fixP->fx_addsy != NULL | |
2591 | && !S_IS_WEAK (fixP->fx_addsy) | |
2592 | && !S_IS_COMMON (fixP->fx_addsy) | |
2593 | ? S_GET_VALUE (fixP->fx_addsy) : 0); | |
3c3bdf30 NC |
2594 | arelent *relP; |
2595 | bfd_reloc_code_real_type code = BFD_RELOC_NONE; | |
2596 | char *buf = fixP->fx_where + fixP->fx_frag->fr_literal; | |
2597 | symbolS *addsy = fixP->fx_addsy; | |
2598 | asection *addsec = addsy == NULL ? NULL : S_GET_SEGMENT (addsy); | |
3c3bdf30 | 2599 | asymbol *baddsy = addsy != NULL ? symbol_get_bfdsym (addsy) : NULL; |
5459d7a0 HPN |
2600 | bfd_vma addend |
2601 | = val - (baddsy == NULL || S_IS_COMMON (addsy) || S_IS_WEAK (addsy) | |
2602 | ? 0 : bfd_asymbol_value (baddsy)); | |
3c3bdf30 NC |
2603 | |
2604 | /* A single " LOCAL expression" in the wrong section will not work when | |
2605 | linking to MMO; relocations for zero-content sections are then | |
2606 | ignored. Normally, relocations would modify section contents, and | |
2607 | you'd never think or be able to do something like that. The | |
2608 | relocation resulting from a LOCAL directive doesn't have an obvious | |
2609 | and mandatory location. I can't figure out a way to do this better | |
2610 | than just helping the user around this limitation here; hopefully the | |
2611 | code using the local expression is around. Putting the LOCAL | |
2612 | semantics in a relocation still seems right; a section didn't do. */ | |
2613 | if (bfd_section_size (section->owner, section) == 0) | |
2614 | as_bad_where | |
2615 | (fixP->fx_file, fixP->fx_line, | |
2616 | fixP->fx_r_type == BFD_RELOC_MMIX_LOCAL | |
2617 | /* The BFD_RELOC_MMIX_LOCAL-specific message is supposed to be | |
2618 | user-friendly, though a little bit non-substantial. */ | |
2619 | ? _("directive LOCAL must be placed in code or data") | |
2620 | : _("internal confusion: relocation in a section without contents")); | |
2621 | ||
2622 | /* FIXME: Range tests for all these. */ | |
2623 | switch (fixP->fx_r_type) | |
2624 | { | |
2625 | case BFD_RELOC_64: | |
2626 | case BFD_RELOC_32: | |
2627 | case BFD_RELOC_24: | |
2628 | case BFD_RELOC_16: | |
2629 | case BFD_RELOC_8: | |
2630 | code = fixP->fx_r_type; | |
2631 | ||
973eb340 | 2632 | if (addsy == NULL || bfd_is_abs_section (addsec)) |
3c3bdf30 | 2633 | { |
55cf6793 | 2634 | /* Resolve this reloc now, as md_apply_fix would have done (not |
3c3bdf30 NC |
2635 | called if -linkrelax). There is no point in keeping a reloc |
2636 | to an absolute symbol. No reloc that is subject to | |
2637 | relaxation must be to an absolute symbol; difference | |
2638 | involving symbols in a specific section must be signalled as | |
2639 | an error if the relaxing cannot be expressed; having a reloc | |
2640 | to the resolved (now absolute) value does not help. */ | |
2641 | md_number_to_chars (buf, val, fixP->fx_size); | |
2642 | return NULL; | |
2643 | } | |
2644 | break; | |
2645 | ||
2646 | case BFD_RELOC_64_PCREL: | |
2647 | case BFD_RELOC_32_PCREL: | |
2648 | case BFD_RELOC_24_PCREL: | |
2649 | case BFD_RELOC_16_PCREL: | |
2650 | case BFD_RELOC_8_PCREL: | |
2651 | case BFD_RELOC_MMIX_LOCAL: | |
2652 | case BFD_RELOC_VTABLE_INHERIT: | |
2653 | case BFD_RELOC_VTABLE_ENTRY: | |
2654 | case BFD_RELOC_MMIX_GETA: | |
2655 | case BFD_RELOC_MMIX_GETA_1: | |
2656 | case BFD_RELOC_MMIX_GETA_2: | |
2657 | case BFD_RELOC_MMIX_GETA_3: | |
2658 | case BFD_RELOC_MMIX_CBRANCH: | |
2659 | case BFD_RELOC_MMIX_CBRANCH_J: | |
2660 | case BFD_RELOC_MMIX_CBRANCH_1: | |
2661 | case BFD_RELOC_MMIX_CBRANCH_2: | |
2662 | case BFD_RELOC_MMIX_CBRANCH_3: | |
2663 | case BFD_RELOC_MMIX_PUSHJ: | |
2664 | case BFD_RELOC_MMIX_PUSHJ_1: | |
2665 | case BFD_RELOC_MMIX_PUSHJ_2: | |
2666 | case BFD_RELOC_MMIX_PUSHJ_3: | |
88fc725d | 2667 | case BFD_RELOC_MMIX_PUSHJ_STUBBABLE: |
3c3bdf30 NC |
2668 | case BFD_RELOC_MMIX_JMP: |
2669 | case BFD_RELOC_MMIX_JMP_1: | |
2670 | case BFD_RELOC_MMIX_JMP_2: | |
2671 | case BFD_RELOC_MMIX_JMP_3: | |
2672 | case BFD_RELOC_MMIX_ADDR19: | |
2673 | case BFD_RELOC_MMIX_ADDR27: | |
2674 | code = fixP->fx_r_type; | |
2675 | break; | |
2676 | ||
2677 | case BFD_RELOC_MMIX_REG_OR_BYTE: | |
2678 | /* If we have this kind of relocation to an unknown symbol or to the | |
2679 | register contents section (that is, to a register), then we can't | |
2680 | resolve the relocation here. */ | |
2681 | if (addsy != NULL | |
973eb340 | 2682 | && (bfd_is_und_section (addsec) |
3c3bdf30 NC |
2683 | || strcmp (bfd_get_section_name (addsec->owner, addsec), |
2684 | MMIX_REG_CONTENTS_SECTION_NAME) == 0)) | |
2685 | { | |
2686 | code = fixP->fx_r_type; | |
2687 | break; | |
2688 | } | |
2689 | ||
2690 | /* If the relocation is not to the register section or to the | |
2691 | absolute section (a numeric value), then we have an error. */ | |
2692 | if (addsy != NULL | |
2693 | && (S_GET_SEGMENT (addsy) != real_reg_section | |
2694 | || val > 255 | |
2695 | || val < 0) | |
973eb340 | 2696 | && ! bfd_is_abs_section (addsec)) |
3c3bdf30 NC |
2697 | goto badop; |
2698 | ||
2699 | /* Set the "immediate" bit of the insn if this relocation is to Z | |
2700 | field when the value is a numeric value, i.e. not a register. */ | |
2701 | if ((fixP->fx_where & 3) == 3 | |
973eb340 | 2702 | && (addsy == NULL || bfd_is_abs_section (addsec))) |
3c3bdf30 NC |
2703 | buf[-3] |= IMM_OFFSET_BIT; |
2704 | ||
2705 | buf[0] = val; | |
2706 | return NULL; | |
2707 | ||
2708 | case BFD_RELOC_MMIX_BASE_PLUS_OFFSET: | |
2709 | if (addsy != NULL | |
973eb340 HPN |
2710 | && strcmp (bfd_get_section_name (addsec->owner, addsec), |
2711 | MMIX_REG_CONTENTS_SECTION_NAME) == 0) | |
3c3bdf30 NC |
2712 | { |
2713 | /* This changed into a register; the relocation is for the | |
2714 | register-contents section. The constant part remains zero. */ | |
2715 | code = BFD_RELOC_MMIX_REG; | |
2716 | break; | |
2717 | } | |
2718 | ||
2719 | /* If we've found out that this was indeed a register, then replace | |
2720 | with the register number. The constant part is already zero. | |
2721 | ||
2722 | If we encounter any other defined symbol, then we must find a | |
2723 | suitable register and emit a reloc. */ | |
973eb340 | 2724 | if (addsy == NULL || addsec != real_reg_section) |
3c3bdf30 NC |
2725 | { |
2726 | struct mmix_symbol_gregs *gregs; | |
2727 | struct mmix_symbol_greg_fixes *fix; | |
2728 | ||
a1b6236b | 2729 | if (S_IS_DEFINED (addsy) |
5459d7a0 HPN |
2730 | && !bfd_is_com_section (addsec) |
2731 | && !S_IS_WEAK (addsy)) | |
3c3bdf30 | 2732 | { |
973eb340 | 2733 | if (! symbol_section_p (addsy) && ! bfd_is_abs_section (addsec)) |
3c3bdf30 NC |
2734 | as_fatal (_("internal: BFD_RELOC_MMIX_BASE_PLUS_OFFSET not resolved to section")); |
2735 | ||
2736 | /* If this is an absolute symbol sufficiently near | |
2737 | lowest_data_loc, then we canonicalize on the data | |
2738 | section. Note that val is signed here; we may subtract | |
2739 | lowest_data_loc which is unsigned. Careful with those | |
2740 | comparisons. */ | |
2741 | if (lowest_data_loc != (bfd_vma) -1 | |
2742 | && (bfd_vma) val + 256 > lowest_data_loc | |
973eb340 | 2743 | && bfd_is_abs_section (addsec)) |
3c3bdf30 NC |
2744 | { |
2745 | val -= (offsetT) lowest_data_loc; | |
2746 | addsy = section_symbol (data_section); | |
2747 | } | |
2748 | /* Likewise text section. */ | |
2749 | else if (lowest_text_loc != (bfd_vma) -1 | |
2750 | && (bfd_vma) val + 256 > lowest_text_loc | |
973eb340 | 2751 | && bfd_is_abs_section (addsec)) |
3c3bdf30 NC |
2752 | { |
2753 | val -= (offsetT) lowest_text_loc; | |
2754 | addsy = section_symbol (text_section); | |
2755 | } | |
2756 | } | |
2757 | ||
2758 | gregs = *symbol_get_tc (addsy); | |
2759 | ||
2760 | /* If that symbol does not have any associated GREG definitions, | |
973eb340 | 2761 | we can't do anything. */ |
3c3bdf30 NC |
2762 | if (gregs == NULL |
2763 | || (fix = bsearch (&val, gregs->greg_fixes, gregs->n_gregs, | |
2764 | sizeof (gregs->greg_fixes[0]), | |
2765 | cmp_greg_val_greg_symbol_fixes)) == NULL | |
2766 | /* The register must not point *after* the address we want. */ | |
2767 | || fix->offs > val | |
2768 | /* Neither must the register point more than 255 bytes | |
2769 | before the address we want. */ | |
2770 | || fix->offs + 255 < val) | |
2771 | { | |
973eb340 HPN |
2772 | /* We can either let the linker allocate GREGs |
2773 | automatically, or emit an error. */ | |
2774 | if (allocate_undefined_gregs_in_linker) | |
2775 | { | |
2776 | /* The values in baddsy and addend are right. */ | |
2777 | code = fixP->fx_r_type; | |
2778 | break; | |
2779 | } | |
2780 | else | |
2781 | as_bad_where (fixP->fx_file, fixP->fx_line, | |
2782 | _("no suitable GREG definition for operands")); | |
3c3bdf30 NC |
2783 | return NULL; |
2784 | } | |
2785 | else | |
2786 | { | |
2787 | /* Transform the base-plus-offset reloc for the actual area | |
2788 | to a reloc for the register with the address of the area. | |
2789 | Put addend for register in Z operand. */ | |
2790 | buf[1] = val - fix->offs; | |
2791 | code = BFD_RELOC_MMIX_REG; | |
2792 | baddsy | |
2793 | = (bfd_get_section_by_name (stdoutput, | |
2794 | MMIX_REG_CONTENTS_SECTION_NAME) | |
2795 | ->symbol); | |
2796 | ||
2797 | addend = fix->fix->fx_frag->fr_address + fix->fix->fx_where; | |
2798 | } | |
2799 | } | |
2800 | else if (S_GET_VALUE (addsy) > 255) | |
2801 | as_bad_where (fixP->fx_file, fixP->fx_line, | |
2802 | _("invalid operands")); | |
2803 | else | |
2804 | { | |
2805 | *buf = val; | |
2806 | return NULL; | |
2807 | } | |
2808 | break; | |
2809 | ||
2810 | case BFD_RELOC_MMIX_REG: | |
2811 | if (addsy != NULL | |
973eb340 | 2812 | && (bfd_is_und_section (addsec) |
3c3bdf30 NC |
2813 | || strcmp (bfd_get_section_name (addsec->owner, addsec), |
2814 | MMIX_REG_CONTENTS_SECTION_NAME) == 0)) | |
2815 | { | |
2816 | code = fixP->fx_r_type; | |
2817 | break; | |
2818 | } | |
2819 | ||
2820 | if (addsy != NULL | |
973eb340 | 2821 | && (addsec != real_reg_section |
3c3bdf30 NC |
2822 | || val > 255 |
2823 | || val < 0) | |
973eb340 | 2824 | && ! bfd_is_und_section (addsec)) |
3c3bdf30 NC |
2825 | /* Drop through to error message. */ |
2826 | ; | |
2827 | else | |
2828 | { | |
2829 | buf[0] = val; | |
2830 | return NULL; | |
2831 | } | |
a1b6236b | 2832 | /* FALLTHROUGH. */ |
3c3bdf30 | 2833 | |
55cf6793 | 2834 | /* The others are supposed to be handled by md_apply_fix. |
3c3bdf30 | 2835 | FIXME: ... which isn't called when -linkrelax. Move over |
55cf6793 | 2836 | md_apply_fix code here for everything reasonable. */ |
3c3bdf30 NC |
2837 | badop: |
2838 | default: | |
2839 | as_bad_where | |
2840 | (fixP->fx_file, fixP->fx_line, | |
2841 | _("operands were not reducible at assembly-time")); | |
2842 | ||
2843 | /* Unmark this symbol as used in a reloc, so we don't bump into a BFD | |
2844 | assert when trying to output reg_section. FIXME: A gas bug. */ | |
a161fe53 | 2845 | fixP->fx_addsy = NULL; |
3c3bdf30 NC |
2846 | return NULL; |
2847 | } | |
2848 | ||
2849 | relP = (arelent *) xmalloc (sizeof (arelent)); | |
9c2799c2 | 2850 | gas_assert (relP != 0); |
3c3bdf30 NC |
2851 | relP->sym_ptr_ptr = (asymbol **) xmalloc (sizeof (asymbol *)); |
2852 | *relP->sym_ptr_ptr = baddsy; | |
2853 | relP->address = fixP->fx_frag->fr_address + fixP->fx_where; | |
2854 | ||
2855 | relP->addend = addend; | |
2856 | ||
2857 | /* If this had been a.out, we would have had a kludge for weak symbols | |
2858 | here. */ | |
2859 | ||
2860 | relP->howto = bfd_reloc_type_lookup (stdoutput, code); | |
2861 | if (! relP->howto) | |
2862 | { | |
2863 | const char *name; | |
2864 | ||
2865 | name = S_GET_NAME (addsy); | |
2866 | if (name == NULL) | |
2867 | name = _("<unknown>"); | |
2868 | as_fatal (_("cannot generate relocation type for symbol %s, code %s"), | |
2869 | name, bfd_get_reloc_code_name (code)); | |
2870 | } | |
2871 | ||
2872 | return relP; | |
2873 | } | |
2874 | ||
2875 | /* Do some reformatting of a line. FIXME: We could transform a mmixal | |
2876 | line into traditional (GNU?) format, unless #NO_APP, and get rid of all | |
2877 | ugly labels_without_colons etc. */ | |
2878 | ||
2879 | void | |
ff1e783f | 2880 | mmix_handle_mmixal (void) |
3c3bdf30 | 2881 | { |
20d7ce9b HPN |
2882 | char *insn; |
2883 | char *s = input_line_pointer; | |
3c3bdf30 NC |
2884 | char *label = NULL; |
2885 | char c; | |
2886 | ||
2887 | if (pending_label != NULL) | |
2888 | as_fatal (_("internal: unhandled label %s"), pending_label); | |
2889 | ||
2890 | if (mmix_gnu_syntax) | |
2891 | return; | |
2892 | ||
3c3bdf30 NC |
2893 | /* If we're on a line with a label, check if it's a mmixal fb-label. |
2894 | Save an indicator and skip the label; it must be set only after all | |
2895 | fb-labels of expressions are evaluated. */ | |
20d7ce9b | 2896 | if (ISDIGIT (s[0]) && s[1] == 'H' && ISSPACE (s[2])) |
3c3bdf30 | 2897 | { |
20d7ce9b | 2898 | current_fb_label = s[0] - '0'; |
3c3bdf30 NC |
2899 | |
2900 | /* We have to skip the label, but also preserve the newlineness of | |
2901 | the previous character, since the caller checks that. It's a | |
2902 | mess we blame on the caller. */ | |
20d7ce9b HPN |
2903 | s[1] = s[-1]; |
2904 | s += 2; | |
2905 | input_line_pointer = s; | |
3c3bdf30 | 2906 | |
3c3bdf30 NC |
2907 | while (*s && ISSPACE (*s) && ! is_end_of_line[(unsigned int) *s]) |
2908 | s++; | |
2909 | ||
2910 | /* For errors emitted here, the book-keeping is off by one; the | |
2911 | caller is about to bump the counters. Adjust the error messages. */ | |
a1b6236b | 2912 | if (is_end_of_line[(unsigned int) *s]) |
3c3bdf30 NC |
2913 | { |
2914 | char *name; | |
2915 | unsigned int line; | |
2916 | as_where (&name, &line); | |
2917 | as_bad_where (name, line + 1, | |
2918 | _("[0-9]H labels may not appear alone on a line")); | |
2919 | current_fb_label = -1; | |
2920 | } | |
2921 | if (*s == '.') | |
2922 | { | |
2923 | char *name; | |
2924 | unsigned int line; | |
2925 | as_where (&name, &line); | |
2926 | as_bad_where (name, line + 1, | |
2927 | _("[0-9]H labels do not mix with dot-pseudos")); | |
2928 | current_fb_label = -1; | |
2929 | } | |
20d7ce9b HPN |
2930 | |
2931 | /* Back off to the last space before the opcode so we don't handle | |
2932 | the opcode as a label. */ | |
2933 | s--; | |
3c3bdf30 NC |
2934 | } |
2935 | else | |
20d7ce9b HPN |
2936 | current_fb_label = -1; |
2937 | ||
2938 | if (*s == '.') | |
3c3bdf30 | 2939 | { |
20d7ce9b HPN |
2940 | /* If the first character is a '.', then it's a pseudodirective, not a |
2941 | label. Make GAS not handle label-without-colon on this line. We | |
2942 | also don't do mmixal-specific stuff on this line. */ | |
2943 | label_without_colon_this_line = 0; | |
2944 | return; | |
3c3bdf30 NC |
2945 | } |
2946 | ||
20d7ce9b HPN |
2947 | if (*s == 0 || is_end_of_line[(unsigned int) *s]) |
2948 | /* We avoid handling empty lines here. */ | |
2949 | return; | |
2950 | ||
2951 | if (is_name_beginner (*s)) | |
2952 | label = s; | |
2953 | ||
2954 | /* If there is a label, skip over it. */ | |
2955 | while (*s && is_part_of_name (*s)) | |
2956 | s++; | |
2957 | ||
2958 | /* Find the start of the instruction or pseudo following the label, | |
2959 | if there is one. */ | |
2960 | for (insn = s; | |
2961 | *insn && ISSPACE (*insn) && ! is_end_of_line[(unsigned int) *insn]; | |
2962 | insn++) | |
2963 | /* Empty */ | |
2964 | ; | |
2965 | ||
2966 | /* Remove a trailing ":" off labels, as they'd otherwise be considered | |
2967 | part of the name. But don't do this for local labels. */ | |
2968 | if (s != input_line_pointer && s[-1] == ':' | |
2969 | && (s - 2 != input_line_pointer | |
2970 | || ! ISDIGIT (s[-2]))) | |
2971 | s[-1] = ' '; | |
2972 | else if (label != NULL | |
2973 | /* For a lone label on a line, we don't attach it to the next | |
2974 | instruction or MMIXAL-pseudo (getting its alignment). Thus | |
2975 | is acts like a "normal" :-ended label. Ditto if it's | |
2976 | followed by a non-MMIXAL pseudo. */ | |
2977 | && !is_end_of_line[(unsigned int) *insn] | |
2978 | && *insn != '.') | |
3c3bdf30 NC |
2979 | { |
2980 | /* For labels that don't end in ":", we save it so we can later give | |
2981 | it the same alignment and address as the associated instruction. */ | |
2982 | ||
2983 | /* Make room for the label including the ending nul. */ | |
20d7ce9b | 2984 | int len_0 = s - label + 1; |
3c3bdf30 NC |
2985 | |
2986 | /* Save this label on the MMIX symbol obstack. Saving it on an | |
2987 | obstack is needless for "IS"-pseudos, but it's harmless and we | |
2988 | avoid a little code-cluttering. */ | |
2989 | obstack_grow (&mmix_sym_obstack, label, len_0); | |
2990 | pending_label = obstack_finish (&mmix_sym_obstack); | |
2991 | pending_label[len_0 - 1] = 0; | |
2992 | } | |
2993 | ||
20d7ce9b HPN |
2994 | /* If we have a non-MMIXAL pseudo, we have not business with the rest of |
2995 | the line. */ | |
2996 | if (*insn == '.') | |
2997 | return; | |
3c3bdf30 NC |
2998 | |
2999 | /* Find local labels of operands. Look for "[0-9][FB]" where the | |
3000 | characters before and after are not part of words. Break if a single | |
3001 | or double quote is seen anywhere. It means we can't have local | |
3002 | labels as part of list with mixed quoted and unquoted members for | |
3003 | mmixal compatibility but we can't have it all. For the moment. | |
3004 | Replace the '<N>B' or '<N>F' with MAGIC_FB_BACKWARD_CHAR<N> and | |
3005 | MAGIC_FB_FORWARD_CHAR<N> respectively. */ | |
3006 | ||
3007 | /* First make sure we don't have any of the magic characters on the line | |
3008 | appearing as input. */ | |
3c3bdf30 NC |
3009 | while (*s) |
3010 | { | |
3011 | c = *s++; | |
a1b6236b | 3012 | if (is_end_of_line[(unsigned int) c]) |
3c3bdf30 NC |
3013 | break; |
3014 | if (c == MAGIC_FB_BACKWARD_CHAR || c == MAGIC_FB_FORWARD_CHAR) | |
3015 | as_bad (_("invalid characters in input")); | |
3016 | } | |
3017 | ||
3018 | /* Scan again, this time looking for ';' after operands. */ | |
20d7ce9b | 3019 | s = insn; |
3c3bdf30 NC |
3020 | |
3021 | /* Skip the insn. */ | |
3022 | while (*s | |
3023 | && ! ISSPACE (*s) | |
3024 | && *s != ';' | |
3025 | && ! is_end_of_line[(unsigned int) *s]) | |
3026 | s++; | |
3027 | ||
3028 | /* Skip the spaces after the insn. */ | |
3029 | while (*s | |
3030 | && ISSPACE (*s) | |
3031 | && *s != ';' | |
3032 | && ! is_end_of_line[(unsigned int) *s]) | |
3033 | s++; | |
3034 | ||
3035 | /* Skip the operands. While doing this, replace [0-9][BF] with | |
3036 | (MAGIC_FB_BACKWARD_CHAR|MAGIC_FB_FORWARD_CHAR)[0-9]. */ | |
3037 | while ((c = *s) != 0 | |
3038 | && ! ISSPACE (c) | |
3039 | && c != ';' | |
3040 | && ! is_end_of_line[(unsigned int) c]) | |
3041 | { | |
3042 | if (c == '"') | |
3043 | { | |
3044 | s++; | |
3045 | ||
3046 | /* FIXME: Test-case for semi-colon in string. */ | |
3047 | while (*s | |
3048 | && *s != '"' | |
a1b6236b | 3049 | && (! is_end_of_line[(unsigned int) *s] || *s == ';')) |
3c3bdf30 NC |
3050 | s++; |
3051 | ||
3052 | if (*s == '"') | |
3053 | s++; | |
3054 | } | |
3055 | else if (ISDIGIT (c)) | |
3056 | { | |
3057 | if ((s[1] != 'B' && s[1] != 'F') | |
3058 | || is_part_of_name (s[-1]) | |
e0f6ea40 HPN |
3059 | || is_part_of_name (s[2]) |
3060 | /* Don't treat e.g. #1F as a local-label reference. */ | |
3061 | || (s != input_line_pointer && s[-1] == '#')) | |
3c3bdf30 NC |
3062 | s++; |
3063 | else | |
3064 | { | |
3065 | s[0] = (s[1] == 'B' | |
3066 | ? MAGIC_FB_BACKWARD_CHAR : MAGIC_FB_FORWARD_CHAR); | |
3067 | s[1] = c; | |
3068 | } | |
3069 | } | |
3070 | else | |
3071 | s++; | |
3072 | } | |
3073 | ||
3074 | /* Skip any spaces after the operands. */ | |
3075 | while (*s | |
3076 | && ISSPACE (*s) | |
3077 | && *s != ';' | |
3078 | && !is_end_of_line[(unsigned int) *s]) | |
3079 | s++; | |
3080 | ||
3081 | /* If we're now looking at a semi-colon, then it's an end-of-line | |
3082 | delimiter. */ | |
3083 | mmix_next_semicolon_is_eoln = (*s == ';'); | |
3084 | ||
3085 | /* Make IS into an EQU by replacing it with "= ". Only match upper-case | |
3086 | though; let lower-case be a syntax error. */ | |
20d7ce9b | 3087 | s = insn; |
3c3bdf30 NC |
3088 | if (s[0] == 'I' && s[1] == 'S' && ISSPACE (s[2])) |
3089 | { | |
3090 | *s = '='; | |
3091 | s[1] = ' '; | |
3092 | ||
3093 | /* Since labels can start without ":", we have to handle "X IS 42" | |
3094 | in full here, or "X" will be parsed as a label to be set at ".". */ | |
3095 | input_line_pointer = s; | |
3096 | ||
3097 | /* Right after this function ends, line numbers will be bumped if | |
3098 | input_line_pointer[-1] = '\n'. We want accurate line numbers for | |
3099 | the equals call, so we bump them before the call, and make sure | |
3100 | they aren't bumped afterwards. */ | |
3101 | bump_line_counters (); | |
3102 | ||
3103 | /* A fb-label is valid as an IS-label. */ | |
3104 | if (current_fb_label >= 0) | |
3105 | { | |
3106 | char *fb_name; | |
3107 | ||
3108 | /* We need to save this name on our symbol obstack, since the | |
3109 | string we got in fb_label_name is volatile and will change | |
3110 | with every call to fb_label_name, like those resulting from | |
3111 | parsing the IS-operand. */ | |
3112 | fb_name = fb_label_name (current_fb_label, 1); | |
3113 | obstack_grow (&mmix_sym_obstack, fb_name, strlen (fb_name) + 1); | |
3114 | equals (obstack_finish (&mmix_sym_obstack), 0); | |
3115 | fb_label_instance_inc (current_fb_label); | |
3116 | current_fb_label = -1; | |
3117 | } | |
3118 | else | |
3119 | { | |
3120 | if (pending_label == NULL) | |
3121 | as_bad (_("empty label field for IS")); | |
3122 | else | |
3123 | equals (pending_label, 0); | |
3124 | pending_label = NULL; | |
3125 | } | |
3126 | ||
3127 | /* For mmixal, we can have comments without a comment-start | |
3128 | character. */ | |
3129 | mmix_handle_rest_of_empty_line (); | |
3130 | input_line_pointer--; | |
3131 | ||
3132 | input_line_pointer[-1] = ' '; | |
3133 | } | |
3134 | else if (s[0] == 'G' | |
3135 | && s[1] == 'R' | |
3136 | && strncmp (s, "GREG", 4) == 0 | |
3137 | && (ISSPACE (s[4]) || is_end_of_line[(unsigned char) s[4]])) | |
3138 | { | |
3139 | input_line_pointer = s + 4; | |
3140 | ||
3141 | /* Right after this function ends, line numbers will be bumped if | |
3142 | input_line_pointer[-1] = '\n'. We want accurate line numbers for | |
3143 | the s_greg call, so we bump them before the call, and make sure | |
3144 | they aren't bumped afterwards. */ | |
3145 | bump_line_counters (); | |
3146 | ||
3147 | /* A fb-label is valid as a GREG-label. */ | |
3148 | if (current_fb_label >= 0) | |
3149 | { | |
3150 | char *fb_name; | |
3151 | ||
3152 | /* We need to save this name on our symbol obstack, since the | |
3153 | string we got in fb_label_name is volatile and will change | |
3154 | with every call to fb_label_name, like those resulting from | |
3155 | parsing the IS-operand. */ | |
3156 | fb_name = fb_label_name (current_fb_label, 1); | |
3157 | ||
3158 | /* Make sure we save the canonical name and don't get bitten by | |
3159 | prefixes. */ | |
3160 | obstack_1grow (&mmix_sym_obstack, ':'); | |
3161 | obstack_grow (&mmix_sym_obstack, fb_name, strlen (fb_name) + 1); | |
3162 | mmix_greg_internal (obstack_finish (&mmix_sym_obstack)); | |
3163 | fb_label_instance_inc (current_fb_label); | |
3164 | current_fb_label = -1; | |
3165 | } | |
3166 | else | |
3167 | mmix_greg_internal (pending_label); | |
3168 | ||
3169 | /* Back up before the end-of-line marker that was skipped in | |
3170 | mmix_greg_internal. */ | |
3171 | input_line_pointer--; | |
3172 | input_line_pointer[-1] = ' '; | |
3173 | ||
3174 | pending_label = NULL; | |
3175 | } | |
3176 | else if (pending_label != NULL) | |
3177 | { | |
3178 | input_line_pointer += strlen (pending_label); | |
3179 | ||
3180 | /* See comment above about getting line numbers bumped. */ | |
3181 | input_line_pointer[-1] = '\n'; | |
3182 | } | |
3183 | } | |
3184 | ||
3185 | /* Give the value of an fb-label rewritten as in mmix_handle_mmixal, when | |
3186 | parsing an expression. | |
3187 | ||
3188 | On valid calls, input_line_pointer points at a MAGIC_FB_BACKWARD_CHAR | |
3189 | or MAGIC_FB_BACKWARD_CHAR, followed by an ascii digit for the label. | |
3190 | We fill in the label as an expression. */ | |
3191 | ||
3192 | void | |
ff1e783f | 3193 | mmix_fb_label (expressionS *expP) |
3c3bdf30 NC |
3194 | { |
3195 | symbolS *sym; | |
3196 | char *fb_internal_name; | |
3197 | ||
3198 | /* This doesn't happen when not using mmixal syntax. */ | |
3199 | if (mmix_gnu_syntax | |
3200 | || (input_line_pointer[0] != MAGIC_FB_BACKWARD_CHAR | |
3201 | && input_line_pointer[0] != MAGIC_FB_FORWARD_CHAR)) | |
3202 | return; | |
3203 | ||
3204 | /* The current backward reference has augmentation 0. A forward | |
3205 | reference has augmentation 1, unless it's the same as a fb-label on | |
3206 | _this_ line, in which case we add one more so we don't refer to it. | |
3207 | This is the semantics of mmixal; it differs to that of common | |
3208 | fb-labels which refer to a here-label on the current line as a | |
3209 | backward reference. */ | |
3210 | fb_internal_name | |
3211 | = fb_label_name (input_line_pointer[1] - '0', | |
3212 | (input_line_pointer[0] == MAGIC_FB_FORWARD_CHAR ? 1 : 0) | |
3213 | + ((input_line_pointer[1] - '0' == current_fb_label | |
3214 | && input_line_pointer[0] == MAGIC_FB_FORWARD_CHAR) | |
3215 | ? 1 : 0)); | |
3216 | ||
3217 | input_line_pointer += 2; | |
3218 | sym = symbol_find_or_make (fb_internal_name); | |
3219 | ||
3220 | /* We don't have to clean up unrelated fields here; we just do what the | |
3221 | expr machinery does, but *not* just what it does for [0-9][fb], since | |
3222 | we need to treat those as ordinary symbols sometimes; see testcases | |
3223 | err-byte2.s and fb-2.s. */ | |
3224 | if (S_GET_SEGMENT (sym) == absolute_section) | |
3225 | { | |
3226 | expP->X_op = O_constant; | |
3227 | expP->X_add_number = S_GET_VALUE (sym); | |
3228 | } | |
3229 | else | |
3230 | { | |
3231 | expP->X_op = O_symbol; | |
3232 | expP->X_add_symbol = sym; | |
3233 | expP->X_add_number = 0; | |
3234 | } | |
3235 | } | |
3236 | ||
3237 | /* See whether we need to force a relocation into the output file. | |
3238 | This is used to force out switch and PC relative relocations when | |
3239 | relaxing. */ | |
3240 | ||
3241 | int | |
ff1e783f | 3242 | mmix_force_relocation (fixS *fixP) |
3c3bdf30 NC |
3243 | { |
3244 | if (fixP->fx_r_type == BFD_RELOC_MMIX_LOCAL | |
3c3bdf30 NC |
3245 | || fixP->fx_r_type == BFD_RELOC_MMIX_BASE_PLUS_OFFSET) |
3246 | return 1; | |
3247 | ||
3c3bdf30 NC |
3248 | if (linkrelax) |
3249 | return 1; | |
3250 | ||
55cf6793 | 3251 | /* All our pcrel relocations are must-keep. Note that md_apply_fix is |
3c3bdf30 NC |
3252 | called *after* this, and will handle getting rid of the presumed |
3253 | reloc; a relocation isn't *forced* other than to be handled by | |
55cf6793 | 3254 | md_apply_fix (or tc_gen_reloc if linkrelax). */ |
3c3bdf30 NC |
3255 | if (fixP->fx_pcrel) |
3256 | return 1; | |
3257 | ||
ae6063d4 | 3258 | return generic_force_reloc (fixP); |
3c3bdf30 NC |
3259 | } |
3260 | ||
3261 | /* The location from which a PC relative jump should be calculated, | |
3262 | given a PC relative reloc. */ | |
3263 | ||
3264 | long | |
ff1e783f | 3265 | md_pcrel_from_section (fixS *fixP, segT sec) |
3c3bdf30 NC |
3266 | { |
3267 | if (fixP->fx_addsy != (symbolS *) NULL | |
3268 | && (! S_IS_DEFINED (fixP->fx_addsy) | |
3269 | || S_GET_SEGMENT (fixP->fx_addsy) != sec)) | |
3270 | { | |
3271 | /* The symbol is undefined (or is defined but not in this section). | |
3272 | Let the linker figure it out. */ | |
3273 | return 0; | |
3274 | } | |
3275 | ||
3276 | return (fixP->fx_frag->fr_address + fixP->fx_where); | |
3277 | } | |
3278 | ||
3279 | /* Adjust the symbol table. We make reg_section relative to the real | |
a161fe53 | 3280 | register section. */ |
3c3bdf30 NC |
3281 | |
3282 | void | |
ff1e783f | 3283 | mmix_adjust_symtab (void) |
3c3bdf30 NC |
3284 | { |
3285 | symbolS *sym; | |
3c3bdf30 | 3286 | symbolS *regsec = section_symbol (reg_section); |
3c3bdf30 | 3287 | |
a161fe53 | 3288 | for (sym = symbol_rootP; sym != NULL; sym = symbol_next (sym)) |
3c3bdf30 NC |
3289 | if (S_GET_SEGMENT (sym) == reg_section) |
3290 | { | |
a161fe53 | 3291 | if (sym == regsec) |
3c3bdf30 | 3292 | { |
e97b3f28 | 3293 | if (S_IS_EXTERNAL (sym) || symbol_used_in_reloc_p (sym)) |
a161fe53 | 3294 | abort (); |
3c3bdf30 | 3295 | symbol_remove (sym, &symbol_rootP, &symbol_lastP); |
3c3bdf30 NC |
3296 | } |
3297 | else | |
a161fe53 AM |
3298 | /* Change section to the *real* register section, so it gets |
3299 | proper treatment when writing it out. Only do this for | |
3300 | global symbols. This also means we don't have to check for | |
3301 | $0..$255. */ | |
3302 | S_SET_SEGMENT (sym, real_reg_section); | |
3c3bdf30 NC |
3303 | } |
3304 | } | |
3305 | ||
3306 | /* This is the expansion of LABELS_WITHOUT_COLONS. | |
3307 | We let md_start_line_hook tweak label_without_colon_this_line, and then | |
3308 | this function returns the tweaked value, and sets it to 1 for the next | |
3309 | line. FIXME: Very, very brittle. Not sure it works the way I | |
3310 | thought at the time I first wrote this. */ | |
3311 | ||
3312 | int | |
ff1e783f | 3313 | mmix_label_without_colon_this_line (void) |
3c3bdf30 NC |
3314 | { |
3315 | int retval = label_without_colon_this_line; | |
3316 | ||
3317 | if (! mmix_gnu_syntax) | |
3318 | label_without_colon_this_line = 1; | |
3319 | ||
3320 | return retval; | |
3321 | } | |
3322 | ||
3323 | /* This is the expansion of md_relax_frag. We go through the ordinary | |
3324 | relax table function except when the frag is for a GREG. Then we have | |
3325 | to check whether there's another GREG by the same value that we can | |
3326 | join with. */ | |
3327 | ||
3328 | long | |
ff1e783f | 3329 | mmix_md_relax_frag (segT seg, fragS *fragP, long stretch) |
3c3bdf30 | 3330 | { |
88fc725d HPN |
3331 | switch (fragP->fr_subtype) |
3332 | { | |
3333 | /* Growth for this type has been handled by mmix_md_end and | |
3334 | correctly estimated, so there's nothing more to do here. */ | |
3335 | case STATE_GREG_DEF: | |
3336 | return 0; | |
3c3bdf30 | 3337 | |
88fc725d HPN |
3338 | case ENCODE_RELAX (STATE_PUSHJ, STATE_ZERO): |
3339 | { | |
3340 | /* We need to handle relaxation type ourselves, since relax_frag | |
3341 | doesn't update fr_subtype if there's no size increase in the | |
3342 | current section; when going from plain PUSHJ to a stub. This | |
3343 | is otherwise functionally the same as relax_frag in write.c, | |
3344 | simplified for this case. */ | |
3345 | offsetT aim; | |
3346 | addressT target; | |
3347 | addressT address; | |
3348 | symbolS *symbolP; | |
3349 | target = fragP->fr_offset; | |
3350 | address = fragP->fr_address; | |
3351 | symbolP = fragP->fr_symbol; | |
3352 | ||
3353 | if (symbolP) | |
3354 | { | |
3355 | fragS *sym_frag; | |
3356 | ||
3357 | sym_frag = symbol_get_frag (symbolP); | |
3358 | know (S_GET_SEGMENT (symbolP) != absolute_section | |
3359 | || sym_frag == &zero_address_frag); | |
3360 | target += S_GET_VALUE (symbolP); | |
3361 | ||
3362 | /* If frag has yet to be reached on this pass, assume it will | |
3363 | move by STRETCH just as we did. If this is not so, it will | |
3364 | be because some frag between grows, and that will force | |
3365 | another pass. */ | |
3366 | ||
3367 | if (stretch != 0 | |
3368 | && sym_frag->relax_marker != fragP->relax_marker | |
3369 | && S_GET_SEGMENT (symbolP) == seg) | |
3370 | target += stretch; | |
3371 | } | |
3372 | ||
3373 | aim = target - address - fragP->fr_fix; | |
3374 | if (aim >= PUSHJ_0B && aim <= PUSHJ_0F) | |
3375 | { | |
3376 | /* Target is reachable with a PUSHJ. */ | |
3377 | segment_info_type *seginfo = seg_info (seg); | |
3378 | ||
3379 | /* If we're at the end of a relaxation round, clear the stub | |
3380 | counter as initialization for the next round. */ | |
3381 | if (fragP == seginfo->tc_segment_info_data.last_stubfrag) | |
3382 | seginfo->tc_segment_info_data.nstubs = 0; | |
3383 | return 0; | |
3384 | } | |
3385 | ||
3386 | /* Not reachable. Try a stub. */ | |
3387 | fragP->fr_subtype = ENCODE_RELAX (STATE_PUSHJSTUB, STATE_ZERO); | |
3388 | } | |
3389 | /* FALLTHROUGH. */ | |
3390 | ||
3391 | /* See if this PUSHJ is redirectable to a stub. */ | |
3392 | case ENCODE_RELAX (STATE_PUSHJSTUB, STATE_ZERO): | |
3393 | { | |
3394 | segment_info_type *seginfo = seg_info (seg); | |
3395 | fragS *lastfrag = seginfo->frchainP->frch_last; | |
3396 | relax_substateT prev_type = fragP->fr_subtype; | |
3397 | ||
3398 | /* The last frag is always an empty frag, so it suffices to look | |
3399 | at its address to know the ending address of this section. */ | |
3400 | know (lastfrag->fr_type == rs_fill | |
3401 | && lastfrag->fr_fix == 0 | |
3402 | && lastfrag->fr_var == 0); | |
3403 | ||
3404 | /* For this PUSHJ to be relaxable into a call to a stub, the | |
3405 | distance must be no longer than 256k bytes from the PUSHJ to | |
3406 | the end of the section plus the maximum size of stubs so far. */ | |
3407 | if ((lastfrag->fr_address | |
3408 | + stretch | |
3409 | + PUSHJ_MAX_LEN * seginfo->tc_segment_info_data.nstubs) | |
3410 | - (fragP->fr_address + fragP->fr_fix) | |
3411 | > GETA_0F | |
3412 | || !pushj_stubs) | |
3413 | fragP->fr_subtype = mmix_relax_table[prev_type].rlx_more; | |
3414 | else | |
3415 | seginfo->tc_segment_info_data.nstubs++; | |
3416 | ||
3417 | /* If we're at the end of a relaxation round, clear the stub | |
3418 | counter as initialization for the next round. */ | |
3419 | if (fragP == seginfo->tc_segment_info_data.last_stubfrag) | |
3420 | seginfo->tc_segment_info_data.nstubs = 0; | |
3421 | ||
3422 | return | |
3423 | (mmix_relax_table[fragP->fr_subtype].rlx_length | |
3424 | - mmix_relax_table[prev_type].rlx_length); | |
3425 | } | |
3426 | ||
3427 | case ENCODE_RELAX (STATE_PUSHJ, STATE_MAX): | |
3428 | { | |
3429 | segment_info_type *seginfo = seg_info (seg); | |
3430 | ||
3431 | /* Need to cover all STATE_PUSHJ states to act on the last stub | |
3432 | frag (the end of this relax round; initialization for the | |
3433 | next). */ | |
3434 | if (fragP == seginfo->tc_segment_info_data.last_stubfrag) | |
3435 | seginfo->tc_segment_info_data.nstubs = 0; | |
3436 | ||
3437 | return 0; | |
3438 | } | |
3439 | ||
3440 | default: | |
3441 | return relax_frag (seg, fragP, stretch); | |
3442 | ||
3443 | case STATE_GREG_UNDF: | |
3444 | BAD_CASE (fragP->fr_subtype); | |
3445 | } | |
3c3bdf30 NC |
3446 | |
3447 | as_fatal (_("internal: unexpected relax type %d:%d"), | |
3448 | fragP->fr_type, fragP->fr_subtype); | |
3449 | return 0; | |
3450 | } | |
3451 | ||
3452 | /* Various things we punt until all input is seen. */ | |
3453 | ||
3454 | void | |
ff1e783f | 3455 | mmix_md_end (void) |
3c3bdf30 NC |
3456 | { |
3457 | fragS *fragP; | |
3458 | symbolS *mainsym; | |
455bde50 | 3459 | asection *regsec; |
3c3bdf30 NC |
3460 | int i; |
3461 | ||
3462 | /* The first frag of GREG:s going into the register contents section. */ | |
3463 | fragS *mmix_reg_contents_frags = NULL; | |
3464 | ||
3465 | /* Reset prefix. All labels reachable at this point must be | |
3466 | canonicalized. */ | |
3467 | mmix_current_prefix = NULL; | |
3468 | ||
3469 | if (doing_bspec) | |
3470 | as_bad_where (bspec_file, bspec_line, _("BSPEC without ESPEC.")); | |
3471 | ||
3472 | /* Emit the low LOC setting of .text. */ | |
3473 | if (text_has_contents && lowest_text_loc != (bfd_vma) -1) | |
3474 | { | |
3475 | symbolS *symbolP; | |
3476 | char locsymbol[sizeof (":") - 1 | |
3477 | + sizeof (MMIX_LOC_SECTION_START_SYMBOL_PREFIX) - 1 | |
3478 | + sizeof (".text")]; | |
3479 | ||
3480 | /* An exercise in non-ISO-C-ness, this one. */ | |
3481 | sprintf (locsymbol, ":%s%s", MMIX_LOC_SECTION_START_SYMBOL_PREFIX, | |
3482 | ".text"); | |
3483 | symbolP | |
3484 | = symbol_new (locsymbol, absolute_section, lowest_text_loc, | |
3485 | &zero_address_frag); | |
3486 | S_SET_EXTERNAL (symbolP); | |
3487 | } | |
3488 | ||
3489 | /* Ditto .data. */ | |
3490 | if (data_has_contents && lowest_data_loc != (bfd_vma) -1) | |
3491 | { | |
3492 | symbolS *symbolP; | |
3493 | char locsymbol[sizeof (":") - 1 | |
a1b6236b KH |
3494 | + sizeof (MMIX_LOC_SECTION_START_SYMBOL_PREFIX) - 1 |
3495 | + sizeof (".data")]; | |
3c3bdf30 NC |
3496 | |
3497 | sprintf (locsymbol, ":%s%s", MMIX_LOC_SECTION_START_SYMBOL_PREFIX, | |
3498 | ".data"); | |
3499 | symbolP | |
3500 | = symbol_new (locsymbol, absolute_section, lowest_data_loc, | |
3501 | &zero_address_frag); | |
3502 | S_SET_EXTERNAL (symbolP); | |
3503 | } | |
3504 | ||
3505 | /* Unless GNU syntax mode, set "Main" to be a function, so the | |
3506 | disassembler doesn't get confused when we write truly | |
3507 | mmixal-compatible code (and don't use .type). Similarly set it | |
3508 | global (regardless of -globalize-symbols), so the linker sees it as | |
3509 | the start symbol in ELF mode. */ | |
3510 | mainsym = symbol_find (MMIX_START_SYMBOL_NAME); | |
3511 | if (mainsym != NULL && ! mmix_gnu_syntax) | |
3512 | { | |
3513 | symbol_get_bfdsym (mainsym)->flags |= BSF_FUNCTION; | |
3514 | S_SET_EXTERNAL (mainsym); | |
3515 | } | |
3516 | ||
3517 | if (n_of_raw_gregs != 0) | |
3518 | { | |
3519 | /* Emit GREGs. They are collected in order of appearance, but must | |
3520 | be emitted in opposite order to both have section address regno*8 | |
3521 | and the same allocation order (within a file) as mmixal. */ | |
3522 | segT this_segment = now_seg; | |
3523 | subsegT this_subsegment = now_subseg; | |
455bde50 AM |
3524 | |
3525 | regsec = bfd_make_section_old_way (stdoutput, | |
3526 | MMIX_REG_CONTENTS_SECTION_NAME); | |
3c3bdf30 NC |
3527 | subseg_set (regsec, 0); |
3528 | ||
3529 | /* Finally emit the initialization-value. Emit a variable frag, which | |
3530 | we'll fix in md_estimate_size_before_relax. We set the initializer | |
3531 | for the tc_frag_data field to NULL, so we can use that field for | |
3532 | relaxation purposes. */ | |
3533 | mmix_opcode_frag = NULL; | |
3534 | ||
3535 | frag_grow (0); | |
3536 | mmix_reg_contents_frags = frag_now; | |
3537 | ||
3538 | for (i = n_of_raw_gregs - 1; i >= 0; i--) | |
3539 | { | |
3540 | if (mmix_raw_gregs[i].label != NULL) | |
3541 | /* There's a symbol. Let it refer to this location in the | |
3542 | register contents section. The symbol must be globalized | |
3543 | separately. */ | |
3544 | colon (mmix_raw_gregs[i].label); | |
3545 | ||
3546 | frag_var (rs_machine_dependent, 8, 0, STATE_GREG_UNDF, | |
3547 | make_expr_symbol (&mmix_raw_gregs[i].exp), 0, NULL); | |
3548 | } | |
3549 | ||
3550 | subseg_set (this_segment, this_subsegment); | |
3551 | } | |
3552 | ||
455bde50 AM |
3553 | regsec = bfd_get_section_by_name (stdoutput, MMIX_REG_CONTENTS_SECTION_NAME); |
3554 | /* Mark the section symbol as being OK for a reloc. */ | |
3555 | if (regsec != NULL) | |
3556 | regsec->symbol->flags |= BSF_KEEP; | |
3557 | ||
3c3bdf30 NC |
3558 | /* Iterate over frags resulting from GREGs and move those that evidently |
3559 | have the same value together and point one to another. | |
3560 | ||
3561 | This works in time O(N^2) but since the upper bound for non-error use | |
3562 | is 223, it's best to keep this simpler algorithm. */ | |
3563 | for (fragP = mmix_reg_contents_frags; fragP != NULL; fragP = fragP->fr_next) | |
3564 | { | |
3565 | fragS **fpp; | |
3566 | fragS *fp = NULL; | |
3567 | fragS *osymfrag; | |
3568 | offsetT osymval; | |
3569 | expressionS *oexpP; | |
3570 | symbolS *symbolP = fragP->fr_symbol; | |
3571 | ||
3572 | if (fragP->fr_type != rs_machine_dependent | |
3573 | || fragP->fr_subtype != STATE_GREG_UNDF) | |
3574 | continue; | |
3575 | ||
3576 | /* Whatever the outcome, we will have this GREG judged merged or | |
3577 | non-merged. Since the tc_frag_data is NULL at this point, we | |
3578 | default to non-merged. */ | |
3579 | fragP->fr_subtype = STATE_GREG_DEF; | |
3580 | ||
3581 | /* If we're not supposed to merge GREG definitions, then just don't | |
3582 | look for equivalents. */ | |
3583 | if (! merge_gregs) | |
3584 | continue; | |
3585 | ||
3586 | osymval = (offsetT) S_GET_VALUE (symbolP); | |
3587 | osymfrag = symbol_get_frag (symbolP); | |
3588 | ||
3589 | /* If the symbol isn't defined, we can't say that another symbol | |
3590 | equals this frag, then. FIXME: We can look at the "deepest" | |
3591 | defined name; if a = c and b = c then obviously a == b. */ | |
3592 | if (! S_IS_DEFINED (symbolP)) | |
3593 | continue; | |
3594 | ||
3595 | oexpP = symbol_get_value_expression (fragP->fr_symbol); | |
3596 | ||
3597 | /* If the initialization value is zero, then we must not merge them. */ | |
3598 | if (oexpP->X_op == O_constant && osymval == 0) | |
3599 | continue; | |
3600 | ||
3601 | /* Iterate through the frags downward this one. If we find one that | |
3602 | has the same non-zero value, move it to after this one and point | |
3603 | to it as the equivalent. */ | |
3604 | for (fpp = &fragP->fr_next; *fpp != NULL; fpp = &fpp[0]->fr_next) | |
3605 | { | |
3606 | fp = *fpp; | |
3607 | ||
3608 | if (fp->fr_type != rs_machine_dependent | |
3609 | || fp->fr_subtype != STATE_GREG_UNDF) | |
3610 | continue; | |
3611 | ||
3612 | /* Calling S_GET_VALUE may simplify the symbol, changing from | |
3613 | expr_section etc. so call it first. */ | |
3614 | if ((offsetT) S_GET_VALUE (fp->fr_symbol) == osymval | |
3615 | && symbol_get_frag (fp->fr_symbol) == osymfrag) | |
3616 | { | |
3617 | /* Move the frag links so the one we found equivalent comes | |
3618 | after the current one, carefully considering that | |
3619 | sometimes fpp == &fragP->fr_next and the moves must be a | |
3620 | NOP then. */ | |
3621 | *fpp = fp->fr_next; | |
3622 | fp->fr_next = fragP->fr_next; | |
3623 | fragP->fr_next = fp; | |
3624 | break; | |
3625 | } | |
3626 | } | |
3627 | ||
3628 | if (*fpp != NULL) | |
3629 | fragP->tc_frag_data = fp; | |
3630 | } | |
3631 | } | |
3632 | ||
3633 | /* qsort function for mmix_symbol_gregs. */ | |
3634 | ||
3635 | static int | |
ff1e783f | 3636 | cmp_greg_symbol_fixes (const void *parg, const void *qarg) |
3c3bdf30 NC |
3637 | { |
3638 | const struct mmix_symbol_greg_fixes *p | |
3639 | = (const struct mmix_symbol_greg_fixes *) parg; | |
3640 | const struct mmix_symbol_greg_fixes *q | |
3641 | = (const struct mmix_symbol_greg_fixes *) qarg; | |
3642 | ||
3643 | return p->offs > q->offs ? 1 : p->offs < q->offs ? -1 : 0; | |
3644 | } | |
3645 | ||
3646 | /* Collect GREG definitions from mmix_gregs and hang them as lists sorted | |
3647 | on increasing offsets onto each section symbol or undefined symbol. | |
3648 | ||
3649 | Also, remove the register convenience section so it doesn't get output | |
3650 | as an ELF section. */ | |
3651 | ||
3652 | void | |
ff1e783f | 3653 | mmix_frob_file (void) |
3c3bdf30 NC |
3654 | { |
3655 | int i; | |
3656 | struct mmix_symbol_gregs *all_greg_symbols[MAX_GREGS]; | |
3657 | int n_greg_symbols = 0; | |
3658 | ||
3659 | /* Collect all greg fixups and decorate each corresponding symbol with | |
3660 | the greg fixups for it. */ | |
3661 | for (i = 0; i < n_of_cooked_gregs; i++) | |
3662 | { | |
3663 | offsetT offs; | |
3664 | symbolS *sym; | |
3665 | struct mmix_symbol_gregs *gregs; | |
3666 | fixS *fixP; | |
3667 | ||
3668 | fixP = mmix_gregs[i]; | |
3669 | know (fixP->fx_r_type == BFD_RELOC_64); | |
3670 | ||
3671 | /* This case isn't doable in general anyway, methinks. */ | |
3672 | if (fixP->fx_subsy != NULL) | |
3673 | { | |
3674 | as_bad_where (fixP->fx_file, fixP->fx_line, | |
3675 | _("GREG expression too complicated")); | |
3676 | continue; | |
3677 | } | |
3678 | ||
3679 | sym = fixP->fx_addsy; | |
3680 | offs = (offsetT) fixP->fx_offset; | |
3681 | ||
3682 | /* If the symbol is defined, then it must be resolved to a section | |
3683 | symbol at this time, or else we don't know how to handle it. */ | |
5459d7a0 HPN |
3684 | if (S_IS_DEFINED (sym) |
3685 | && !bfd_is_com_section (S_GET_SEGMENT (sym)) | |
3686 | && !S_IS_WEAK (sym)) | |
3c3bdf30 NC |
3687 | { |
3688 | if (! symbol_section_p (sym) | |
3689 | && ! bfd_is_abs_section (S_GET_SEGMENT (sym))) | |
3690 | as_fatal (_("internal: GREG expression not resolved to section")); | |
3691 | ||
3692 | offs += S_GET_VALUE (sym); | |
3693 | } | |
3694 | ||
3695 | /* If this is an absolute symbol sufficiently near lowest_data_loc, | |
3696 | then we canonicalize on the data section. Note that offs is | |
3697 | signed here; we may subtract lowest_data_loc which is unsigned. | |
3698 | Careful with those comparisons. */ | |
3699 | if (lowest_data_loc != (bfd_vma) -1 | |
3700 | && (bfd_vma) offs + 256 > lowest_data_loc | |
3701 | && bfd_is_abs_section (S_GET_SEGMENT (sym))) | |
3702 | { | |
3703 | offs -= (offsetT) lowest_data_loc; | |
3704 | sym = section_symbol (data_section); | |
3705 | } | |
3706 | /* Likewise text section. */ | |
3707 | else if (lowest_text_loc != (bfd_vma) -1 | |
3708 | && (bfd_vma) offs + 256 > lowest_text_loc | |
3709 | && bfd_is_abs_section (S_GET_SEGMENT (sym))) | |
3710 | { | |
3711 | offs -= (offsetT) lowest_text_loc; | |
3712 | sym = section_symbol (text_section); | |
3713 | } | |
3714 | ||
3715 | gregs = *symbol_get_tc (sym); | |
3716 | ||
3717 | if (gregs == NULL) | |
3718 | { | |
3719 | gregs = xmalloc (sizeof (*gregs)); | |
3720 | gregs->n_gregs = 0; | |
3721 | symbol_set_tc (sym, &gregs); | |
3722 | all_greg_symbols[n_greg_symbols++] = gregs; | |
3723 | } | |
3724 | ||
3725 | gregs->greg_fixes[gregs->n_gregs].fix = fixP; | |
3726 | gregs->greg_fixes[gregs->n_gregs++].offs = offs; | |
3727 | } | |
3728 | ||
3729 | /* For each symbol having a GREG definition, sort those definitions on | |
3730 | offset. */ | |
3731 | for (i = 0; i < n_greg_symbols; i++) | |
3732 | qsort (all_greg_symbols[i]->greg_fixes, all_greg_symbols[i]->n_gregs, | |
3733 | sizeof (all_greg_symbols[i]->greg_fixes[0]), cmp_greg_symbol_fixes); | |
3734 | ||
3735 | if (real_reg_section != NULL) | |
3736 | { | |
3c3bdf30 NC |
3737 | /* FIXME: Pass error state gracefully. */ |
3738 | if (bfd_get_section_flags (stdoutput, real_reg_section) & SEC_HAS_CONTENTS) | |
3739 | as_fatal (_("register section has contents\n")); | |
3740 | ||
69852798 | 3741 | bfd_section_list_remove (stdoutput, real_reg_section); |
3c3bdf30 NC |
3742 | --stdoutput->section_count; |
3743 | } | |
3744 | ||
3745 | } | |
3746 | ||
3747 | /* Provide an expression for a built-in name provided when-used. | |
3748 | Either a symbol that is a handler; living in 0x10*[1..8] and having | |
3749 | name [DVWIOUZX]_Handler, or a mmixal built-in symbol. | |
3750 | ||
3751 | If the name isn't a built-in name and parsed into *EXPP, return zero. */ | |
3752 | ||
3753 | int | |
ff1e783f | 3754 | mmix_parse_predefined_name (char *name, expressionS *expP) |
3c3bdf30 NC |
3755 | { |
3756 | char *canon_name; | |
3757 | char *handler_charp; | |
3758 | const char handler_chars[] = "DVWIOUZX"; | |
3759 | symbolS *symp; | |
3760 | ||
3761 | if (! predefined_syms) | |
3762 | return 0; | |
3763 | ||
3764 | canon_name = tc_canonicalize_symbol_name (name); | |
3765 | ||
3766 | if (canon_name[1] == '_' | |
3767 | && strcmp (canon_name + 2, "Handler") == 0 | |
3768 | && (handler_charp = strchr (handler_chars, *canon_name)) != NULL) | |
3769 | { | |
3770 | /* If the symbol doesn't exist, provide one relative to the .text | |
3771 | section. | |
3772 | ||
3773 | FIXME: We should provide separate sections, mapped in the linker | |
3774 | script. */ | |
3775 | symp = symbol_find (name); | |
3776 | if (symp == NULL) | |
3777 | symp = symbol_new (name, text_section, | |
3778 | 0x10 * (handler_charp + 1 - handler_chars), | |
3779 | &zero_address_frag); | |
3780 | } | |
3781 | else | |
3782 | { | |
3783 | /* These symbols appear when referenced; needed for | |
3784 | mmixal-compatible programs. */ | |
3785 | unsigned int i; | |
3786 | ||
3787 | static const struct | |
3788 | { | |
3789 | const char *name; | |
3790 | valueT val; | |
3791 | } predefined_abs_syms[] = | |
3792 | { | |
3793 | {"Data_Segment", (valueT) 0x20 << 56}, | |
3794 | {"Pool_Segment", (valueT) 0x40 << 56}, | |
3795 | {"Stack_Segment", (valueT) 0x60 << 56}, | |
3796 | {"StdIn", 0}, | |
3797 | {"StdOut", 1}, | |
3798 | {"StdErr", 2}, | |
3799 | {"TextRead", 0}, | |
3800 | {"TextWrite", 1}, | |
3801 | {"BinaryRead", 2}, | |
3802 | {"BinaryWrite", 3}, | |
3803 | {"BinaryReadWrite", 4}, | |
3804 | {"Halt", 0}, | |
3805 | {"Fopen", 1}, | |
3806 | {"Fclose", 2}, | |
3807 | {"Fread", 3}, | |
3808 | {"Fgets", 4}, | |
3809 | {"Fgetws", 5}, | |
3810 | {"Fwrite", 6}, | |
3811 | {"Fputs", 7}, | |
3812 | {"Fputws", 8}, | |
3813 | {"Fseek", 9}, | |
3814 | {"Ftell", 10}, | |
3815 | {"D_BIT", 0x80}, | |
3816 | {"V_BIT", 0x40}, | |
3817 | {"W_BIT", 0x20}, | |
3818 | {"I_BIT", 0x10}, | |
3819 | {"O_BIT", 0x08}, | |
3820 | {"U_BIT", 0x04}, | |
3821 | {"Z_BIT", 0x02}, | |
3822 | {"X_BIT", 0x01}, | |
3823 | {"Inf", 0x7ff00000} | |
3824 | }; | |
3825 | ||
3826 | /* If it's already in the symbol table, we shouldn't do anything. */ | |
3827 | symp = symbol_find (name); | |
3828 | if (symp != NULL) | |
3829 | return 0; | |
3830 | ||
3831 | for (i = 0; | |
a1b6236b | 3832 | i < sizeof (predefined_abs_syms) / sizeof (predefined_abs_syms[0]); |
3c3bdf30 NC |
3833 | i++) |
3834 | if (strcmp (canon_name, predefined_abs_syms[i].name) == 0) | |
3835 | { | |
3836 | symbol_table_insert (symbol_new (predefined_abs_syms[i].name, | |
3837 | absolute_section, | |
3838 | predefined_abs_syms[i].val, | |
3839 | &zero_address_frag)); | |
3840 | ||
3841 | /* Let gas find the symbol we just created, through its | |
3842 | ordinary lookup. */ | |
3843 | return 0; | |
3844 | } | |
3845 | ||
3846 | /* Not one of those symbols. Let gas handle it. */ | |
3847 | return 0; | |
3848 | } | |
3849 | ||
3850 | expP->X_op = O_symbol; | |
3851 | expP->X_add_number = 0; | |
3852 | expP->X_add_symbol = symp; | |
3853 | expP->X_op_symbol = NULL; | |
3854 | ||
3855 | return 1; | |
3856 | } | |
3857 | ||
3c3bdf30 NC |
3858 | /* Just check that we don't have a BSPEC/ESPEC pair active when changing |
3859 | sections "normally", and get knowledge about alignment from the new | |
3860 | section. */ | |
3861 | ||
3862 | void | |
ff1e783f | 3863 | mmix_md_elf_section_change_hook (void) |
3c3bdf30 NC |
3864 | { |
3865 | if (doing_bspec) | |
3866 | as_bad (_("section change from within a BSPEC/ESPEC pair is not supported")); | |
3867 | ||
3868 | last_alignment = bfd_get_section_alignment (now_seg->owner, now_seg); | |
3869 | want_unaligned = 0; | |
3870 | } | |
3871 | ||
3872 | /* The LOC worker. This is like s_org, but we have to support changing | |
3873 | section too. */ | |
3874 | ||
3875 | static void | |
ff1e783f | 3876 | s_loc (int ignore ATTRIBUTE_UNUSED) |
3c3bdf30 NC |
3877 | { |
3878 | segT section; | |
3879 | expressionS exp; | |
3880 | char *p; | |
3881 | symbolS *sym; | |
3882 | offsetT off; | |
3883 | ||
a1b6236b | 3884 | /* Must not have a BSPEC in progress. */ |
3c3bdf30 NC |
3885 | if (doing_bspec) |
3886 | { | |
3887 | as_bad (_("directive LOC from within a BSPEC/ESPEC pair is not supported")); | |
3888 | return; | |
3889 | } | |
3890 | ||
3891 | section = expression (&exp); | |
3892 | ||
3893 | if (exp.X_op == O_illegal | |
3894 | || exp.X_op == O_absent | |
3895 | || exp.X_op == O_big | |
3896 | || section == undefined_section) | |
3897 | { | |
3898 | as_bad (_("invalid LOC expression")); | |
3899 | return; | |
3900 | } | |
3901 | ||
3902 | if (section == absolute_section) | |
3903 | { | |
3904 | /* Translate a constant into a suitable section. */ | |
3905 | ||
3906 | if (exp.X_add_number < ((offsetT) 0x20 << 56)) | |
3907 | { | |
1afc8def HPN |
3908 | /* Lower than Data_Segment or in the reserved area (the |
3909 | segment number is >= 0x80, appearing negative) - assume | |
3910 | it's .text. */ | |
3c3bdf30 NC |
3911 | section = text_section; |
3912 | ||
3913 | /* Save the lowest seen location, so we can pass on this | |
3914 | information to the linker. We don't actually org to this | |
3915 | location here, we just pass on information to the linker so | |
3916 | it can put the code there for us. */ | |
3917 | ||
3918 | /* If there was already a loc (that has to be set lower than | |
3919 | this one), we org at (this - lower). There's an implicit | |
3920 | "LOC 0" before any entered code. FIXME: handled by spurious | |
3921 | settings of text_has_contents. */ | |
1afc8def HPN |
3922 | if (lowest_text_loc != (bfd_vma) -1 |
3923 | && (bfd_vma) exp.X_add_number < lowest_text_loc) | |
3c3bdf30 NC |
3924 | { |
3925 | as_bad (_("LOC expression stepping backwards is not supported")); | |
3926 | exp.X_op = O_absent; | |
3927 | } | |
3928 | else | |
3929 | { | |
3930 | if (text_has_contents && lowest_text_loc == (bfd_vma) -1) | |
3931 | lowest_text_loc = 0; | |
3932 | ||
3933 | if (lowest_text_loc == (bfd_vma) -1) | |
3934 | { | |
3935 | lowest_text_loc = exp.X_add_number; | |
3936 | ||
3937 | /* We want only to change the section, not set an offset. */ | |
3938 | exp.X_op = O_absent; | |
3939 | } | |
3940 | else | |
3941 | exp.X_add_number -= lowest_text_loc; | |
3942 | } | |
3943 | } | |
3944 | else | |
3945 | { | |
1afc8def HPN |
3946 | /* Do the same for the .data section, except we don't have |
3947 | to worry about exp.X_add_number carrying a sign. */ | |
3c3bdf30 NC |
3948 | section = data_section; |
3949 | ||
3950 | if (exp.X_add_number < (offsetT) lowest_data_loc) | |
3951 | { | |
3952 | as_bad (_("LOC expression stepping backwards is not supported")); | |
3953 | exp.X_op = O_absent; | |
3954 | } | |
3955 | else | |
3956 | { | |
3957 | if (data_has_contents && lowest_data_loc == (bfd_vma) -1) | |
3958 | lowest_data_loc = (bfd_vma) 0x20 << 56; | |
3959 | ||
3960 | if (lowest_data_loc == (bfd_vma) -1) | |
3961 | { | |
3962 | lowest_data_loc = exp.X_add_number; | |
3963 | ||
3964 | /* We want only to change the section, not set an offset. */ | |
3965 | exp.X_op = O_absent; | |
3966 | } | |
3967 | else | |
3968 | exp.X_add_number -= lowest_data_loc; | |
3969 | } | |
3970 | } | |
3971 | } | |
3972 | ||
3973 | if (section != now_seg) | |
3974 | { | |
3975 | obj_elf_section_change_hook (); | |
3976 | subseg_set (section, 0); | |
3977 | ||
3978 | /* Call our section change hooks using the official hook. */ | |
3979 | md_elf_section_change_hook (); | |
3980 | } | |
3981 | ||
3982 | if (exp.X_op != O_absent) | |
3983 | { | |
3984 | if (exp.X_op != O_constant && exp.X_op != O_symbol) | |
3985 | { | |
3986 | /* Handle complex expressions. */ | |
3987 | sym = make_expr_symbol (&exp); | |
3988 | off = 0; | |
3989 | } | |
3990 | else | |
3991 | { | |
3992 | sym = exp.X_add_symbol; | |
3993 | off = exp.X_add_number; | |
3994 | } | |
3995 | ||
3996 | p = frag_var (rs_org, 1, 1, (relax_substateT) 0, sym, off, (char *) 0); | |
3997 | *p = 0; | |
3998 | } | |
3999 | ||
4000 | mmix_handle_rest_of_empty_line (); | |
4001 | } | |
4002 | ||
4003 | /* The BYTE worker. We have to support sequences of mixed "strings", | |
4004 | numbers and other constant "first-pass" reducible expressions separated | |
4005 | by comma. */ | |
4006 | ||
4007 | static void | |
ff1e783f | 4008 | mmix_byte (void) |
3c3bdf30 NC |
4009 | { |
4010 | unsigned int c; | |
3c3bdf30 NC |
4011 | |
4012 | if (now_seg == text_section) | |
4013 | text_has_contents = 1; | |
4014 | else if (now_seg == data_section) | |
4015 | data_has_contents = 1; | |
4016 | ||
4017 | do | |
4018 | { | |
4019 | SKIP_WHITESPACE (); | |
4020 | switch (*input_line_pointer) | |
4021 | { | |
4022 | case '\"': | |
4023 | ++input_line_pointer; | |
3c3bdf30 NC |
4024 | while (is_a_char (c = next_char_of_string ())) |
4025 | { | |
4026 | FRAG_APPEND_1_CHAR (c); | |
4027 | } | |
4028 | ||
4029 | if (input_line_pointer[-1] != '\"') | |
4030 | { | |
4031 | /* We will only get here in rare cases involving #NO_APP, | |
4032 | where the unterminated string is not recognized by the | |
4033 | preformatting pass. */ | |
4034 | as_bad (_("unterminated string")); | |
4035 | mmix_discard_rest_of_line (); | |
4036 | return; | |
4037 | } | |
4038 | break; | |
4039 | ||
4040 | default: | |
4041 | { | |
4042 | expressionS exp; | |
4043 | segT expseg = expression (&exp); | |
4044 | ||
4045 | /* We have to allow special register names as constant numbers. */ | |
4046 | if ((expseg != absolute_section && expseg != reg_section) | |
4047 | || (exp.X_op != O_constant | |
4048 | && (exp.X_op != O_register | |
4049 | || exp.X_add_number <= 255))) | |
4050 | { | |
4051 | as_bad (_("BYTE expression not a pure number")); | |
4052 | mmix_discard_rest_of_line (); | |
4053 | return; | |
4054 | } | |
4055 | else if ((exp.X_add_number > 255 && exp.X_op != O_register) | |
4056 | || exp.X_add_number < 0) | |
4057 | { | |
4058 | /* Note that mmixal does not allow negative numbers in | |
4059 | BYTE sequences, so neither should we. */ | |
4060 | as_bad (_("BYTE expression not in the range 0..255")); | |
4061 | mmix_discard_rest_of_line (); | |
4062 | return; | |
4063 | } | |
4064 | ||
4065 | FRAG_APPEND_1_CHAR (exp.X_add_number); | |
4066 | } | |
4067 | break; | |
4068 | } | |
4069 | ||
4070 | SKIP_WHITESPACE (); | |
4071 | c = *input_line_pointer++; | |
4072 | } | |
4073 | while (c == ','); | |
4074 | ||
4075 | input_line_pointer--; | |
4076 | ||
4077 | if (mmix_gnu_syntax) | |
4078 | demand_empty_rest_of_line (); | |
4079 | else | |
4080 | { | |
4081 | mmix_discard_rest_of_line (); | |
4082 | /* Do like demand_empty_rest_of_line and step over the end-of-line | |
4083 | boundary. */ | |
4084 | input_line_pointer++; | |
4085 | } | |
4086 | ||
4087 | /* Make sure we align for the next instruction. */ | |
4088 | last_alignment = 0; | |
4089 | } | |
4090 | ||
4091 | /* Like cons_worker, but we have to ignore "naked comments", not barf on | |
4092 | them. Implements WYDE, TETRA and OCTA. We're a little bit more | |
4093 | lenient than mmix_byte but FIXME: they should eventually merge. */ | |
4094 | ||
4095 | static void | |
ff1e783f | 4096 | mmix_cons (int nbytes) |
3c3bdf30 NC |
4097 | { |
4098 | expressionS exp; | |
3c3bdf30 NC |
4099 | |
4100 | /* If we don't have any contents, then it's ok to have a specified start | |
4101 | address that is not a multiple of the max data size. We will then | |
4102 | align it as necessary when we get here. Otherwise, it's a fatal sin. */ | |
4103 | if (now_seg == text_section) | |
4104 | { | |
4105 | if (lowest_text_loc != (bfd_vma) -1 | |
4106 | && (lowest_text_loc & (nbytes - 1)) != 0) | |
4107 | { | |
4108 | if (text_has_contents) | |
4109 | as_bad (_("data item with alignment larger than location")); | |
4110 | else if (want_unaligned) | |
4111 | as_bad (_("unaligned data at an absolute location is not supported")); | |
4112 | ||
4113 | lowest_text_loc &= ~((bfd_vma) nbytes - 1); | |
4114 | lowest_text_loc += (bfd_vma) nbytes; | |
4115 | } | |
4116 | ||
4117 | text_has_contents = 1; | |
4118 | } | |
4119 | else if (now_seg == data_section) | |
4120 | { | |
4121 | if (lowest_data_loc != (bfd_vma) -1 | |
4122 | && (lowest_data_loc & (nbytes - 1)) != 0) | |
4123 | { | |
4124 | if (data_has_contents) | |
4125 | as_bad (_("data item with alignment larger than location")); | |
4126 | else if (want_unaligned) | |
4127 | as_bad (_("unaligned data at an absolute location is not supported")); | |
4128 | ||
4129 | lowest_data_loc &= ~((bfd_vma) nbytes - 1); | |
4130 | lowest_data_loc += (bfd_vma) nbytes; | |
4131 | } | |
4132 | ||
4133 | data_has_contents = 1; | |
4134 | } | |
4135 | ||
4136 | /* Always align these unless asked not to (valid for the current pseudo). */ | |
4137 | if (! want_unaligned) | |
4138 | { | |
4139 | last_alignment = nbytes == 2 ? 1 : (nbytes == 4 ? 2 : 3); | |
4140 | frag_align (last_alignment, 0, 0); | |
4141 | record_alignment (now_seg, last_alignment); | |
4142 | } | |
4143 | ||
4144 | /* For mmixal compatibility, a label for an instruction (and emitting | |
4145 | pseudo) refers to the _aligned_ address. So we have to emit the | |
4146 | label here. */ | |
4147 | if (current_fb_label >= 0) | |
4148 | colon (fb_label_name (current_fb_label, 1)); | |
4149 | else if (pending_label != NULL) | |
4150 | { | |
4151 | colon (pending_label); | |
4152 | pending_label = NULL; | |
4153 | } | |
4154 | ||
4155 | SKIP_WHITESPACE (); | |
4156 | ||
a1b6236b | 4157 | if (is_end_of_line[(unsigned int) *input_line_pointer]) |
3c3bdf30 NC |
4158 | { |
4159 | /* Default to zero if the expression was absent. */ | |
4160 | ||
4161 | exp.X_op = O_constant; | |
4162 | exp.X_add_number = 0; | |
4163 | exp.X_unsigned = 0; | |
4164 | exp.X_add_symbol = NULL; | |
4165 | exp.X_op_symbol = NULL; | |
4166 | emit_expr (&exp, (unsigned int) nbytes); | |
4167 | } | |
4168 | else | |
4169 | do | |
4170 | { | |
4171 | unsigned int c; | |
4172 | ||
4173 | switch (*input_line_pointer) | |
4174 | { | |
4175 | /* We support strings here too; each character takes up nbytes | |
4176 | bytes. */ | |
4177 | case '\"': | |
4178 | ++input_line_pointer; | |
3c3bdf30 NC |
4179 | while (is_a_char (c = next_char_of_string ())) |
4180 | { | |
4181 | exp.X_op = O_constant; | |
4182 | exp.X_add_number = c; | |
4183 | exp.X_unsigned = 1; | |
4184 | emit_expr (&exp, (unsigned int) nbytes); | |
4185 | } | |
4186 | ||
4187 | if (input_line_pointer[-1] != '\"') | |
4188 | { | |
4189 | /* We will only get here in rare cases involving #NO_APP, | |
4190 | where the unterminated string is not recognized by the | |
4191 | preformatting pass. */ | |
4192 | as_bad (_("unterminated string")); | |
4193 | mmix_discard_rest_of_line (); | |
4194 | return; | |
4195 | } | |
4196 | break; | |
4197 | ||
4198 | default: | |
4199 | { | |
4200 | expression (&exp); | |
4201 | emit_expr (&exp, (unsigned int) nbytes); | |
4202 | SKIP_WHITESPACE (); | |
4203 | } | |
4204 | break; | |
4205 | } | |
4206 | } | |
4207 | while (*input_line_pointer++ == ','); | |
4208 | ||
4209 | input_line_pointer--; /* Put terminator back into stream. */ | |
4210 | ||
4211 | mmix_handle_rest_of_empty_line (); | |
4212 | ||
4213 | /* We don't need to step up the counter for the current_fb_label here; | |
4214 | that's handled by the caller. */ | |
4215 | } | |
4216 | ||
4217 | /* The md_do_align worker. At present, we just record an alignment to | |
4218 | nullify the automatic alignment we do for WYDE, TETRA and OCTA, as gcc | |
4219 | does not use the unaligned macros when attribute packed is used. | |
4220 | Arguably this is a GCC bug. */ | |
4221 | ||
4222 | void | |
ff1e783f HPN |
4223 | mmix_md_do_align (int n, char *fill ATTRIBUTE_UNUSED, |
4224 | int len ATTRIBUTE_UNUSED, int max ATTRIBUTE_UNUSED) | |
3c3bdf30 NC |
4225 | { |
4226 | last_alignment = n; | |
4227 | want_unaligned = n == 0; | |
4228 | } |