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1 | /* tc-ft32.c -- Assemble code for ft32 |
2 | Copyright (C) 2008-2015 Free Software Foundation, Inc. | |
3 | ||
4 | This file is part of GAS, the GNU Assembler. | |
5 | ||
6 | GAS is free software; you can redistribute it and/or modify | |
7 | it under the terms of the GNU General Public License as published by | |
8 | the Free Software Foundation; either version 3, or (at your option) | |
9 | any later version. | |
10 | ||
11 | GAS is distributed in the hope that it will be useful, | |
12 | but WITHOUT ANY WARRANTY; without even the implied warranty of | |
13 | MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the | |
14 | GNU General Public License for more details. | |
15 | ||
16 | You should have received a copy of the GNU General Public License | |
17 | along with GAS; see the file COPYING. If not, write to | |
18 | the Free Software Foundation, 51 Franklin Street - Fifth Floor, | |
19 | Boston, MA 02110-1301, USA. */ | |
20 | ||
21 | /* Contributed by Anthony Green <green@spindazzle.org>. */ | |
22 | ||
23 | #include "as.h" | |
24 | #include "safe-ctype.h" | |
25 | #include "opcode/ft32.h" | |
26 | ||
27 | extern const ft32_opc_info_t ft32_opc_info[128]; | |
28 | ||
29 | const char comment_chars[] = "#"; | |
30 | const char line_separator_chars[] = ";"; | |
31 | const char line_comment_chars[] = "#"; | |
32 | ||
33 | static int pending_reloc; | |
34 | static struct hash_control *opcode_hash_control; | |
35 | ||
36 | static valueT md_chars_to_number (char * buf, int n); | |
37 | ||
38 | const pseudo_typeS md_pseudo_table[] = | |
39 | { | |
40 | {0, 0, 0} | |
41 | }; | |
42 | ||
43 | const char FLT_CHARS[] = "rRsSfFdDxXpP"; | |
44 | const char EXP_CHARS[] = "eE"; | |
45 | ||
46 | /* This function is called once, at assembler startup time. It sets | |
47 | up the hash table with all the opcodes in it, and also initializes | |
48 | some aliases for compatibility with other assemblers. */ | |
49 | ||
50 | void | |
51 | md_begin (void) | |
52 | { | |
53 | const ft32_opc_info_t *opcode; | |
54 | opcode_hash_control = hash_new (); | |
55 | ||
56 | /* Insert names into hash table. */ | |
57 | for (opcode = ft32_opc_info; opcode->name; opcode++) | |
58 | hash_insert (opcode_hash_control, opcode->name, (char *) opcode); | |
59 | ||
60 | bfd_set_arch_mach (stdoutput, TARGET_ARCH, 0); | |
61 | } | |
62 | ||
63 | /* Parse an expression and then restore the input line pointer. */ | |
64 | ||
65 | static char * | |
66 | parse_exp_save_ilp (char *s, expressionS *op) | |
67 | { | |
68 | char *save = input_line_pointer; | |
69 | ||
70 | input_line_pointer = s; | |
71 | expression (op); | |
72 | s = input_line_pointer; | |
73 | input_line_pointer = save; | |
74 | return s; | |
75 | } | |
76 | ||
77 | static int | |
78 | parse_condition (char **ptr) | |
79 | { | |
80 | char *s = *ptr; | |
81 | static const struct { | |
82 | char *name; | |
83 | int bits; | |
84 | } ccs[] = { | |
85 | { "gt," , (2 << FT32_FLD_CR_BIT) | (5 << FT32_FLD_CB_BIT) | (1 << FT32_FLD_CV_BIT)}, | |
86 | { "gte," , (2 << FT32_FLD_CR_BIT) | (4 << FT32_FLD_CB_BIT) | (1 << FT32_FLD_CV_BIT)}, | |
87 | { "lt," , (2 << FT32_FLD_CR_BIT) | (4 << FT32_FLD_CB_BIT) | (0 << FT32_FLD_CV_BIT)}, | |
88 | { "lte," , (2 << FT32_FLD_CR_BIT) | (5 << FT32_FLD_CB_BIT) | (0 << FT32_FLD_CV_BIT)}, | |
89 | { "a," , (2 << FT32_FLD_CR_BIT) | (6 << FT32_FLD_CB_BIT) | (1 << FT32_FLD_CV_BIT)}, | |
90 | { "ae," , (2 << FT32_FLD_CR_BIT) | (1 << FT32_FLD_CB_BIT) | (0 << FT32_FLD_CV_BIT)}, | |
91 | { "be," , (2 << FT32_FLD_CR_BIT) | (6 << FT32_FLD_CB_BIT) | (0 << FT32_FLD_CV_BIT)}, | |
92 | { "b," , (2 << FT32_FLD_CR_BIT) | (1 << FT32_FLD_CB_BIT) | (1 << FT32_FLD_CV_BIT)}, | |
93 | { "nz," , (2 << FT32_FLD_CR_BIT) | (0 << FT32_FLD_CB_BIT) | (0 << FT32_FLD_CV_BIT)}, | |
94 | { "z," , (2 << FT32_FLD_CR_BIT) | (0 << FT32_FLD_CB_BIT) | (1 << FT32_FLD_CV_BIT)}, | |
95 | { "nc," , (2 << FT32_FLD_CR_BIT) | (1 << FT32_FLD_CB_BIT) | (0 << FT32_FLD_CV_BIT)}, | |
96 | { "c," , (2 << FT32_FLD_CR_BIT) | (1 << FT32_FLD_CB_BIT) | (1 << FT32_FLD_CV_BIT)}, | |
97 | { "no," , (2 << FT32_FLD_CR_BIT) | (2 << FT32_FLD_CB_BIT) | (0 << FT32_FLD_CV_BIT)}, | |
98 | { "o," , (2 << FT32_FLD_CR_BIT) | (2 << FT32_FLD_CB_BIT) | (1 << FT32_FLD_CV_BIT)}, | |
99 | { "ns," , (2 << FT32_FLD_CR_BIT) | (3 << FT32_FLD_CB_BIT) | (0 << FT32_FLD_CV_BIT)}, | |
100 | { "s," , (2 << FT32_FLD_CR_BIT) | (3 << FT32_FLD_CB_BIT) | (1 << FT32_FLD_CV_BIT)}, | |
101 | { NULL, 0} | |
102 | }, *pc; | |
103 | ||
104 | for (pc = ccs; pc->name; pc++) | |
105 | { | |
106 | if (memcmp(pc->name, s, strlen(pc->name)) == 0) | |
107 | { | |
108 | *ptr += strlen(pc->name) - 1; | |
109 | return pc->bits; | |
110 | } | |
111 | } | |
112 | return -1; | |
113 | } | |
114 | ||
115 | static int | |
116 | parse_decimal (char **ptr) | |
117 | { | |
118 | int r = 0; | |
119 | char *s = *ptr; | |
120 | ||
121 | while (('0' <= *s) && (*s <= '9')) | |
122 | { | |
123 | r *= 10; | |
124 | r += (*s++ - '0'); | |
125 | } | |
126 | *ptr = s; | |
127 | return r; | |
128 | } | |
129 | ||
130 | static int | |
131 | parse_register_operand (char **ptr) | |
132 | { | |
133 | int reg; | |
134 | char *s = *ptr; | |
135 | ||
136 | if (*s != '$') | |
137 | { | |
138 | as_bad (_("expecting register")); | |
139 | ignore_rest_of_line (); | |
140 | return -1; | |
141 | } | |
142 | if ((s[1] == 's') && (s[2] == 'p')) | |
143 | { | |
144 | reg = 31; | |
145 | } | |
146 | else if ((s[1] == 'c') && (s[2] == 'c')) | |
147 | { | |
148 | reg = 30; | |
149 | } | |
150 | else if ((s[1] == 'f') && (s[2] == 'p')) | |
151 | { | |
152 | reg = 29; | |
153 | } | |
154 | else if (s[1] == 'r') | |
155 | { | |
156 | reg = s[2] - '0'; | |
157 | if ((reg < 0) || (reg > 9)) | |
158 | { | |
159 | as_bad (_("illegal register number")); | |
160 | ignore_rest_of_line (); | |
161 | return -1; | |
162 | } | |
163 | if ((reg == 1) || (reg == 2) || (reg == 3)) | |
164 | { | |
165 | int r2 = s[3] - '0'; | |
166 | if ((r2 >= 0) && (r2 <= 9)) | |
167 | { | |
168 | reg = (reg * 10) + r2; | |
169 | *ptr += 1; | |
170 | } | |
171 | } | |
172 | } | |
173 | else | |
174 | { | |
175 | as_bad (_("illegal register number")); | |
176 | ignore_rest_of_line (); | |
177 | return -1; | |
178 | } | |
179 | ||
180 | *ptr += 3; | |
181 | ||
182 | return reg; | |
183 | } | |
184 | ||
185 | /* This is the guts of the machine-dependent assembler. STR points to | |
186 | a machine dependent instruction. This function is supposed to emit | |
187 | the frags/bytes it assembles to. */ | |
188 | ||
189 | void | |
190 | md_assemble (char *str) | |
191 | { | |
192 | char *op_start; | |
193 | char *op_end; | |
194 | ||
195 | ft32_opc_info_t *opcode; | |
196 | char *output; | |
197 | int idx = 0; | |
198 | char pend; | |
199 | ||
200 | int nlen = 0; | |
201 | ||
202 | unsigned int b; | |
203 | int f; | |
204 | ||
205 | expressionS arg; | |
206 | ||
207 | /* Drop leading whitespace. */ | |
208 | while (*str == ' ') | |
209 | str++; | |
210 | ||
211 | /* Find the op code end. */ | |
212 | op_start = str; | |
213 | for (op_end = str; | |
214 | *op_end && !is_end_of_line[*op_end & 0xff] && *op_end != ' ' && *op_end != '.'; | |
215 | op_end++) | |
216 | nlen++; | |
217 | ||
218 | pend = *op_end; | |
219 | *op_end = 0; | |
220 | ||
221 | if (nlen == 0) | |
222 | as_bad (_("can't find opcode ")); | |
223 | ||
224 | opcode = (ft32_opc_info_t *) hash_find (opcode_hash_control, op_start); | |
225 | *op_end = pend; | |
226 | ||
227 | if (opcode == NULL) | |
228 | { | |
229 | as_bad (_("unknown opcode %s"), op_start); | |
230 | return; | |
231 | } | |
232 | ||
233 | b = opcode->bits; | |
234 | f = opcode->fields; | |
235 | ||
236 | if (opcode->dw) | |
237 | { | |
238 | int dw; | |
239 | if (*op_end == '.') | |
240 | { | |
241 | switch (op_end[1]) | |
242 | { | |
243 | case 'b': | |
244 | dw = 0; | |
245 | break; | |
246 | case 's': | |
247 | dw = 1; | |
248 | break; | |
249 | case 'l': | |
250 | dw = 2; | |
251 | break; | |
252 | default: | |
253 | as_bad (_("unknown width specifier '.%c'"), op_end[1]); | |
254 | return; | |
255 | } | |
256 | op_end += 2; | |
257 | } | |
258 | else | |
259 | { | |
260 | dw = 2; /* default is ".l" */ | |
261 | } | |
262 | b |= dw << FT32_FLD_DW_BIT; | |
263 | } | |
264 | ||
265 | while (ISSPACE (*op_end)) | |
266 | op_end++; | |
267 | ||
268 | output = frag_more (4); | |
269 | ||
270 | while (f) | |
271 | { | |
272 | int lobit = f & -f; | |
273 | if (f & lobit) | |
274 | { | |
275 | switch (lobit) | |
276 | { | |
277 | case FT32_FLD_CBCRCV: | |
278 | b |= parse_condition( &op_end); | |
279 | break; | |
280 | case FT32_FLD_CB: | |
281 | b |= parse_decimal (&op_end) << FT32_FLD_CB_BIT; | |
282 | break; | |
283 | case FT32_FLD_R_D: | |
284 | b |= parse_register_operand (&op_end) << FT32_FLD_R_D_BIT; | |
285 | break; | |
286 | case FT32_FLD_CR: | |
287 | b |= (parse_register_operand (&op_end) - 28) << FT32_FLD_CR_BIT; | |
288 | break; | |
289 | case FT32_FLD_CV: | |
290 | b |= parse_decimal (&op_end) << FT32_FLD_CV_BIT; | |
291 | break; | |
292 | case FT32_FLD_R_1: | |
293 | b |= parse_register_operand (&op_end) << FT32_FLD_R_1_BIT; | |
294 | break; | |
295 | case FT32_FLD_RIMM: | |
296 | if (*op_end == '$') | |
297 | { | |
298 | b |= parse_register_operand (&op_end) << FT32_FLD_RIMM_BIT; | |
299 | } | |
300 | else | |
301 | { | |
302 | b |= 0x400 << FT32_FLD_RIMM_BIT; | |
303 | op_end = parse_exp_save_ilp (op_end, &arg); | |
304 | fix_new_exp (frag_now, | |
305 | (output - frag_now->fr_literal), | |
306 | 2, | |
307 | &arg, | |
308 | 0, | |
309 | BFD_RELOC_FT32_10); | |
310 | } | |
311 | break; | |
312 | case FT32_FLD_R_2: | |
313 | b |= parse_register_operand (&op_end) << FT32_FLD_R_2_BIT; | |
314 | break; | |
315 | case FT32_FLD_K20: | |
316 | op_end = parse_exp_save_ilp (op_end, &arg); | |
317 | fix_new_exp (frag_now, | |
318 | (output - frag_now->fr_literal), | |
319 | 3, | |
320 | &arg, | |
321 | 0, | |
322 | BFD_RELOC_FT32_20); | |
323 | break; | |
324 | case FT32_FLD_PA: | |
325 | op_end = parse_exp_save_ilp (op_end, &arg); | |
326 | fix_new_exp (frag_now, | |
327 | (output - frag_now->fr_literal), | |
328 | 3, | |
329 | &arg, | |
330 | 0, | |
331 | BFD_RELOC_FT32_18); | |
332 | break; | |
333 | case FT32_FLD_AA: | |
334 | op_end = parse_exp_save_ilp (op_end, &arg); | |
335 | fix_new_exp (frag_now, | |
336 | (output - frag_now->fr_literal), | |
337 | 3, | |
338 | &arg, | |
339 | 0, | |
340 | BFD_RELOC_FT32_17); | |
341 | break; | |
342 | case FT32_FLD_K16: | |
343 | op_end = parse_exp_save_ilp (op_end, &arg); | |
344 | fix_new_exp (frag_now, | |
345 | (output - frag_now->fr_literal), | |
346 | 2, | |
347 | &arg, | |
348 | 0, | |
349 | BFD_RELOC_16); | |
350 | break; | |
351 | case FT32_FLD_K8: | |
352 | op_end = parse_exp_save_ilp (op_end, &arg); | |
353 | fix_new_exp (frag_now, | |
354 | (output - frag_now->fr_literal), | |
355 | 1, | |
356 | &arg, | |
357 | 0, | |
358 | BFD_RELOC_8); | |
359 | break; | |
360 | case FT32_FLD_R_D_POST: | |
361 | b |= parse_register_operand (&op_end) << FT32_FLD_R_D_BIT; | |
362 | break; | |
363 | case FT32_FLD_R_1_POST: | |
364 | b |= parse_register_operand (&op_end) << FT32_FLD_R_1_BIT; | |
365 | break; | |
366 | default: | |
367 | as_bad (_("internal error in argument parsing")); | |
368 | break; | |
369 | } | |
370 | f &= ~lobit; | |
371 | if (f) | |
372 | { | |
373 | while (ISSPACE (*op_end)) | |
374 | op_end++; | |
375 | ||
376 | if (*op_end != ',') | |
377 | { | |
378 | as_bad (_("expected comma separator")); | |
379 | ignore_rest_of_line (); | |
380 | } | |
381 | ||
382 | op_end++; | |
383 | while (ISSPACE (*op_end)) | |
384 | op_end++; | |
385 | } | |
386 | } | |
387 | } | |
388 | if (*op_end != 0) | |
389 | as_warn (_("extra stuff on line ignored")); | |
390 | ||
391 | output[idx++] = 0xff & (b >> 0); | |
392 | output[idx++] = 0xff & (b >> 8); | |
393 | output[idx++] = 0xff & (b >> 16); | |
394 | output[idx++] = 0xff & (b >> 24); | |
395 | ||
396 | while (ISSPACE (*op_end)) | |
397 | op_end++; | |
398 | ||
399 | if (*op_end != 0) | |
400 | as_warn ("extra stuff on line ignored"); | |
401 | ||
402 | if (pending_reloc) | |
403 | as_bad ("Something forgot to clean up\n"); | |
404 | } | |
405 | ||
406 | /* Turn a string in input_line_pointer into a floating point constant | |
407 | of type type, and store the appropriate bytes in *LITP. The number | |
408 | of LITTLENUMS emitted is stored in *SIZEP . An error message is | |
409 | returned, or NULL on OK. */ | |
410 | ||
411 | char * | |
412 | md_atof (int type, char *litP, int *sizeP) | |
413 | { | |
414 | int prec; | |
415 | LITTLENUM_TYPE words[4]; | |
416 | char *t; | |
417 | int i; | |
418 | ||
419 | switch (type) | |
420 | { | |
421 | case 'f': | |
422 | prec = 2; | |
423 | break; | |
424 | ||
425 | case 'd': | |
426 | prec = 4; | |
427 | break; | |
428 | ||
429 | default: | |
430 | *sizeP = 0; | |
431 | return _("bad call to md_atof"); | |
432 | } | |
433 | ||
434 | t = atof_ieee (input_line_pointer, type, words); | |
435 | if (t) | |
436 | input_line_pointer = t; | |
437 | ||
438 | *sizeP = prec * 2; | |
439 | ||
440 | for (i = prec - 1; i >= 0; i--) | |
441 | { | |
442 | md_number_to_chars (litP, (valueT) words[i], 2); | |
443 | litP += 2; | |
444 | } | |
445 | ||
446 | return NULL; | |
447 | } | |
448 | \f | |
449 | const char *md_shortopts = ""; | |
450 | ||
451 | struct option md_longopts[] = | |
452 | { | |
453 | {NULL, no_argument, NULL, 0} | |
454 | }; | |
455 | size_t md_longopts_size = sizeof (md_longopts); | |
456 | ||
457 | /* We have no target specific options yet, so these next | |
458 | two functions are empty. */ | |
459 | int | |
460 | md_parse_option (int c ATTRIBUTE_UNUSED, char *arg ATTRIBUTE_UNUSED) | |
461 | { | |
462 | return 0; | |
463 | } | |
464 | ||
465 | void | |
466 | md_show_usage (FILE *stream ATTRIBUTE_UNUSED) | |
467 | { | |
468 | } | |
469 | ||
470 | /* Convert from target byte order to host byte order. */ | |
471 | ||
472 | static valueT | |
473 | md_chars_to_number (char * buf, int n) | |
474 | { | |
475 | valueT result = 0; | |
476 | unsigned char * where = (unsigned char *) buf; | |
477 | ||
478 | while (n--) | |
479 | { | |
480 | result <<= 8; | |
481 | result |= (where[n] & 255); | |
482 | } | |
483 | ||
484 | return result; | |
485 | } | |
486 | /* Apply a fixup to the object file. */ | |
487 | ||
488 | void | |
489 | md_apply_fix (fixS *fixP ATTRIBUTE_UNUSED, | |
490 | valueT * valP ATTRIBUTE_UNUSED, segT seg ATTRIBUTE_UNUSED) | |
491 | { | |
492 | char *buf = fixP->fx_where + fixP->fx_frag->fr_literal; | |
493 | long val = *valP; | |
494 | long newval; | |
495 | ||
496 | switch (fixP->fx_r_type) | |
497 | { | |
498 | case BFD_RELOC_32: | |
499 | buf[3] = val >> 24; | |
500 | buf[2] = val >> 16; | |
501 | buf[1] = val >> 8; | |
502 | buf[0] = val >> 0; | |
503 | break; | |
504 | ||
505 | case BFD_RELOC_16: | |
506 | buf[1] = val >> 8; | |
507 | buf[0] = val >> 0; | |
508 | break; | |
509 | ||
510 | case BFD_RELOC_8: | |
511 | *buf = val; | |
512 | break; | |
513 | ||
514 | case BFD_RELOC_FT32_10: | |
515 | if (!val) | |
516 | break; | |
517 | newval = md_chars_to_number (buf, 2); | |
518 | newval |= (val & ((1 << 10) - 1)) << FT32_FLD_RIMM_BIT; | |
519 | md_number_to_chars (buf, newval, 2); | |
520 | break; | |
521 | ||
522 | case BFD_RELOC_FT32_20: | |
523 | if (!val) | |
524 | break; | |
525 | newval = md_chars_to_number (buf, 3); | |
526 | newval |= val & ((1 << 20) - 1); | |
527 | md_number_to_chars (buf, newval, 3); | |
528 | break; | |
529 | ||
530 | case BFD_RELOC_FT32_17: | |
531 | if (!val) | |
532 | break; | |
533 | newval = md_chars_to_number (buf, 3); | |
534 | newval |= val & ((1 << 17) - 1); | |
535 | md_number_to_chars (buf, newval, 3); | |
536 | break; | |
537 | ||
538 | case BFD_RELOC_FT32_18: | |
539 | if (!val) | |
540 | break; | |
541 | newval = md_chars_to_number (buf, 4); | |
542 | newval |= (val >> 2) & ((1 << 18) - 1); | |
543 | md_number_to_chars (buf, newval, 4); | |
544 | break; | |
545 | ||
546 | default: | |
547 | abort (); | |
548 | } | |
549 | ||
550 | if (fixP->fx_addsy == NULL && fixP->fx_pcrel == 0) | |
551 | fixP->fx_done = 1; | |
552 | // printf("fx_addsy=%p fixP->fx_pcrel=%d fx_done=%d\n", fixP->fx_addsy, fixP->fx_pcrel, fixP->fx_done); | |
553 | } | |
554 | ||
555 | void | |
556 | md_number_to_chars (char *ptr, valueT use, int nbytes) | |
557 | { | |
558 | number_to_chars_littleendian (ptr, use, nbytes); | |
559 | } | |
560 | ||
561 | /* Generate a machine-dependent relocation. */ | |
562 | arelent * | |
563 | tc_gen_reloc (asection *section ATTRIBUTE_UNUSED, fixS *fixP) | |
564 | { | |
565 | arelent *relP; | |
566 | bfd_reloc_code_real_type code; | |
567 | ||
568 | switch (fixP->fx_r_type) | |
569 | { | |
570 | case BFD_RELOC_32: | |
571 | case BFD_RELOC_16: | |
572 | case BFD_RELOC_8: | |
573 | case BFD_RELOC_FT32_10: | |
574 | case BFD_RELOC_FT32_20: | |
575 | case BFD_RELOC_FT32_17: | |
576 | case BFD_RELOC_FT32_18: | |
577 | code = fixP->fx_r_type; | |
578 | break; | |
579 | default: | |
580 | as_bad_where (fixP->fx_file, fixP->fx_line, | |
581 | _("Semantics error. This type of operand can not be relocated, it must be an assembly-time constant")); | |
582 | return 0; | |
583 | } | |
584 | ||
585 | relP = xmalloc (sizeof (arelent)); | |
586 | gas_assert (relP != 0); | |
587 | relP->sym_ptr_ptr = xmalloc (sizeof (asymbol *)); | |
588 | *relP->sym_ptr_ptr = symbol_get_bfdsym (fixP->fx_addsy); | |
589 | relP->address = fixP->fx_frag->fr_address + fixP->fx_where; | |
590 | ||
591 | relP->addend = fixP->fx_offset; | |
592 | ||
593 | relP->howto = bfd_reloc_type_lookup (stdoutput, code); | |
594 | if (! relP->howto) | |
595 | { | |
596 | const char *name; | |
597 | ||
598 | name = S_GET_NAME (fixP->fx_addsy); | |
599 | if (name == NULL) | |
600 | name = _("<unknown>"); | |
601 | as_fatal (_("Cannot generate relocation type for symbol %s, code %s"), | |
602 | name, bfd_get_reloc_code_name (code)); | |
603 | } | |
604 | ||
605 | return relP; | |
606 | } |