1 /* Assembler interface for targets using CGEN. -*- C -*-
2 CGEN: Cpu tools GENerator
3
4 THIS FILE IS MACHINE GENERATED WITH CGEN.
5 - the resultant file is machine generated, cgen-asm.in isn't
6
7 Copyright 1996, 1997, 1998, 1999, 2000, 2001 Free Software Foundation, Inc.
8
9 This file is part of the GNU Binutils and GDB, the GNU debugger.
10
11 This program is free software; you can redistribute it and/or modify
12 it under the terms of the GNU General Public License as published by
13 the Free Software Foundation; either version 2, or (at your option)
14 any later version.
15
16 This program is distributed in the hope that it will be useful,
17 but WITHOUT ANY WARRANTY; without even the implied warranty of
18 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
19 GNU General Public License for more details.
20
21 You should have received a copy of the GNU General Public License
22 along with this program; if not, write to the Free Software Foundation, Inc.,
23 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA. */
24
25 /* ??? Eventually more and more of this stuff can go to cpu-independent files.
26 Keep that in mind. */
27
28 #include "sysdep.h"
29 #include <stdio.h>
30 #include "ansidecl.h"
31 #include "bfd.h"
32 #include "symcat.h"
33 #include "iq2000-desc.h"
34 #include "iq2000-opc.h"
35 #include "opintl.h"
36 #include "xregex.h"
37 #include "libiberty.h"
38 #include "safe-ctype.h"
39
40 #undef min
41 #define min(a,b) ((a) < (b) ? (a) : (b))
42 #undef max
43 #define max(a,b) ((a) > (b) ? (a) : (b))
44
45 static const char * parse_insn_normal
46 (CGEN_CPU_DESC, const CGEN_INSN *, const char **, CGEN_FIELDS *);
47
48 /* -- assembler routines inserted here. */
49
50 /* -- asm.c */
51 static const char * parse_mimm PARAMS ((CGEN_CPU_DESC, const char **, int, long *));
52 static const char * parse_imm PARAMS ((CGEN_CPU_DESC, const char **, int, unsigned long *));
53 static const char * parse_hi16 PARAMS ((CGEN_CPU_DESC, const char **, int, unsigned long *));
54 static const char * parse_lo16 PARAMS ((CGEN_CPU_DESC, const char **, int, long *));
55
56 /* Special check to ensure that instruction exists for given machine */
57 int
iq2000_cgen_insn_supported(cd,insn)58 iq2000_cgen_insn_supported (cd, insn)
59 CGEN_CPU_DESC cd;
60 CGEN_INSN *insn;
61 {
62 int machs = cd->machs;
63
64 return ((CGEN_INSN_ATTR_VALUE (insn, CGEN_INSN_MACH) & machs) != 0);
65 }
66
iq2000_cgen_isa_register(strp)67 static int iq2000_cgen_isa_register (strp)
68 const char **strp;
69 {
70 int len;
71 int ch1, ch2;
72 if (**strp == 'r' || **strp == 'R')
73 {
74 len = strlen (*strp);
75 if (len == 2)
76 {
77 ch1 = (*strp)[1];
78 if ('0' <= ch1 && ch1 <= '9')
79 return 1;
80 }
81 else if (len == 3)
82 {
83 ch1 = (*strp)[1];
84 ch2 = (*strp)[2];
85 if (('1' <= ch1 && ch1 <= '2') && ('0' <= ch2 && ch2 <= '9'))
86 return 1;
87 if ('3' == ch1 && (ch2 == '0' || ch2 == '1'))
88 return 1;
89 }
90 }
91 if (**strp == '%' && tolower((*strp)[1]) != 'l' && tolower((*strp)[1]) != 'h')
92 return 1;
93 return 0;
94 }
95
96 /* Handle negated literal. */
97
98 static const char *
parse_mimm(cd,strp,opindex,valuep)99 parse_mimm (cd, strp, opindex, valuep)
100 CGEN_CPU_DESC cd;
101 const char **strp;
102 int opindex;
103 long *valuep;
104 {
105 const char *errmsg;
106 long value;
107
108 /* Verify this isn't a register */
109 if (iq2000_cgen_isa_register (strp))
110 errmsg = _("immediate value cannot be register");
111 else
112 {
113 long value;
114
115 errmsg = cgen_parse_signed_integer (cd, strp, opindex, & value);
116 if (errmsg == NULL)
117 {
118 long x = (-value) & 0xFFFF0000;
119 if (x != 0 && x != 0xFFFF0000)
120 errmsg = _("immediate value out of range");
121 else
122 *valuep = (-value & 0xFFFF);
123 }
124 }
125 return errmsg;
126 }
127
128 /* Handle signed/unsigned literal. */
129
130 static const char *
parse_imm(cd,strp,opindex,valuep)131 parse_imm (cd, strp, opindex, valuep)
132 CGEN_CPU_DESC cd;
133 const char **strp;
134 int opindex;
135 unsigned long *valuep;
136 {
137 const char *errmsg;
138 long value;
139
140 if (iq2000_cgen_isa_register (strp))
141 errmsg = _("immediate value cannot be register");
142 else
143 {
144 long value;
145
146 errmsg = cgen_parse_signed_integer (cd, strp, opindex, & value);
147 if (errmsg == NULL)
148 {
149 long x = value & 0xFFFF0000;
150 if (x != 0 && x != 0xFFFF0000)
151 errmsg = _("immediate value out of range");
152 else
153 *valuep = (value & 0xFFFF);
154 }
155 }
156 return errmsg;
157 }
158
159 /* Handle iq10 21-bit jmp offset. */
160
161 static const char *
parse_jtargq10(cd,strp,opindex,reloc,type_addr,valuep)162 parse_jtargq10 (cd, strp, opindex, reloc, type_addr, valuep)
163 CGEN_CPU_DESC cd;
164 const char **strp;
165 int opindex;
166 int reloc;
167 enum cgen_parse_operand_result *type_addr;
168 unsigned long *valuep;
169 {
170 const char *errmsg;
171 bfd_vma value;
172 enum cgen_parse_operand_result result_type = CGEN_PARSE_OPERAND_RESULT_NUMBER;
173
174 errmsg = cgen_parse_address (cd, strp, opindex, BFD_RELOC_IQ2000_OFFSET_21,
175 &result_type, &value);
176 if (errmsg == NULL && result_type == CGEN_PARSE_OPERAND_RESULT_NUMBER)
177 {
178 /* check value is within 23-bits (remembering that 2-bit shift right will occur) */
179 if (value > 0x7fffff)
180 return _("21-bit offset out of range");
181 }
182 *valuep = (value & 0x7FFFFF);
183 return errmsg;
184 }
185
186 /* Handle high(). */
187
188 static const char *
parse_hi16(cd,strp,opindex,valuep)189 parse_hi16 (cd, strp, opindex, valuep)
190 CGEN_CPU_DESC cd;
191 const char **strp;
192 int opindex;
193 unsigned long *valuep;
194 {
195 if (strncasecmp (*strp, "%hi(", 4) == 0)
196 {
197 enum cgen_parse_operand_result result_type;
198 bfd_vma value;
199 const char *errmsg;
200
201 *strp += 4;
202 errmsg = cgen_parse_address (cd, strp, opindex, BFD_RELOC_HI16,
203 &result_type, &value);
204 if (**strp != ')')
205 return _("missing `)'");
206
207 ++*strp;
208 if (errmsg == NULL
209 && result_type == CGEN_PARSE_OPERAND_RESULT_NUMBER)
210 {
211 /* if value has top-bit of %lo on, then it will
212 sign-propagate and so we compensate by adding
213 1 to the resultant %hi value */
214 if (value & 0x8000)
215 value += 0x10000;
216 value >>= 16;
217 }
218 *valuep = value;
219
220 return errmsg;
221 }
222
223 /* we add %uhi in case a user just wants the high 16-bits or is using
224 an insn like ori for %lo which does not sign-propagate */
225 if (strncasecmp (*strp, "%uhi(", 5) == 0)
226 {
227 enum cgen_parse_operand_result result_type;
228 bfd_vma value;
229 const char *errmsg;
230
231 *strp += 5;
232 errmsg = cgen_parse_address (cd, strp, opindex, BFD_RELOC_IQ2000_UHI16,
233 &result_type, &value);
234 if (**strp != ')')
235 return _("missing `)'");
236
237 ++*strp;
238 if (errmsg == NULL
239 && result_type == CGEN_PARSE_OPERAND_RESULT_NUMBER)
240 {
241 value >>= 16;
242 }
243 *valuep = value;
244
245 return errmsg;
246 }
247
248 return parse_imm (cd, strp, opindex, valuep);
249 }
250
251 /* Handle %lo in a signed context.
252 The signedness of the value doesn't matter to %lo(), but this also
253 handles the case where %lo() isn't present. */
254
255 static const char *
parse_lo16(cd,strp,opindex,valuep)256 parse_lo16 (cd, strp, opindex, valuep)
257 CGEN_CPU_DESC cd;
258 const char **strp;
259 int opindex;
260 long *valuep;
261 {
262 if (strncasecmp (*strp, "%lo(", 4) == 0)
263 {
264 const char *errmsg;
265 enum cgen_parse_operand_result result_type;
266 bfd_vma value;
267
268 *strp += 4;
269 errmsg = cgen_parse_address (cd, strp, opindex, BFD_RELOC_LO16,
270 &result_type, &value);
271 if (**strp != ')')
272 return _("missing `)'");
273 ++*strp;
274 if (errmsg == NULL
275 && result_type == CGEN_PARSE_OPERAND_RESULT_NUMBER)
276 value &= 0xffff;
277 *valuep = value;
278 return errmsg;
279 }
280
281 return parse_imm (cd, strp, opindex, valuep);
282 }
283
284 /* Handle %lo in a negated signed context.
285 The signedness of the value doesn't matter to %lo(), but this also
286 handles the case where %lo() isn't present. */
287
288 static const char *
parse_mlo16(cd,strp,opindex,valuep)289 parse_mlo16 (cd, strp, opindex, valuep)
290 CGEN_CPU_DESC cd;
291 const char **strp;
292 int opindex;
293 long *valuep;
294 {
295 if (strncasecmp (*strp, "%lo(", 4) == 0)
296 {
297 const char *errmsg;
298 enum cgen_parse_operand_result result_type;
299 bfd_vma value;
300
301 *strp += 4;
302 errmsg = cgen_parse_address (cd, strp, opindex, BFD_RELOC_LO16,
303 &result_type, &value);
304 if (**strp != ')')
305 return _("missing `)'");
306 ++*strp;
307 if (errmsg == NULL
308 && result_type == CGEN_PARSE_OPERAND_RESULT_NUMBER)
309 value = (-value) & 0xffff;
310 *valuep = value;
311 return errmsg;
312 }
313
314 return parse_mimm (cd, strp, opindex, valuep);
315 }
316
317 /* -- */
318
319 const char * iq2000_cgen_parse_operand
320 PARAMS ((CGEN_CPU_DESC, int, const char **, CGEN_FIELDS *));
321
322 /* Main entry point for operand parsing.
323
324 This function is basically just a big switch statement. Earlier versions
325 used tables to look up the function to use, but
326 - if the table contains both assembler and disassembler functions then
327 the disassembler contains much of the assembler and vice-versa,
328 - there's a lot of inlining possibilities as things grow,
329 - using a switch statement avoids the function call overhead.
330
331 This function could be moved into `parse_insn_normal', but keeping it
332 separate makes clear the interface between `parse_insn_normal' and each of
333 the handlers. */
334
335 const char *
iq2000_cgen_parse_operand(cd,opindex,strp,fields)336 iq2000_cgen_parse_operand (cd, opindex, strp, fields)
337 CGEN_CPU_DESC cd;
338 int opindex;
339 const char ** strp;
340 CGEN_FIELDS * fields;
341 {
342 const char * errmsg = NULL;
343 /* Used by scalar operands that still need to be parsed. */
344 long junk ATTRIBUTE_UNUSED;
345
346 switch (opindex)
347 {
348 case IQ2000_OPERAND_BASE :
349 errmsg = cgen_parse_keyword (cd, strp, & iq2000_cgen_opval_gr_names, & fields->f_rs);
350 break;
351 case IQ2000_OPERAND_BASEOFF :
352 {
353 bfd_vma value;
354 errmsg = cgen_parse_address (cd, strp, IQ2000_OPERAND_BASEOFF, 0, NULL, & value);
355 fields->f_imm = value;
356 }
357 break;
358 case IQ2000_OPERAND_BITNUM :
359 errmsg = cgen_parse_unsigned_integer (cd, strp, IQ2000_OPERAND_BITNUM, &fields->f_rt);
360 break;
361 case IQ2000_OPERAND_BYTECOUNT :
362 errmsg = cgen_parse_unsigned_integer (cd, strp, IQ2000_OPERAND_BYTECOUNT, &fields->f_bytecount);
363 break;
364 case IQ2000_OPERAND_CAM_Y :
365 errmsg = cgen_parse_unsigned_integer (cd, strp, IQ2000_OPERAND_CAM_Y, &fields->f_cam_y);
366 break;
367 case IQ2000_OPERAND_CAM_Z :
368 errmsg = cgen_parse_unsigned_integer (cd, strp, IQ2000_OPERAND_CAM_Z, &fields->f_cam_z);
369 break;
370 case IQ2000_OPERAND_CM_3FUNC :
371 errmsg = cgen_parse_unsigned_integer (cd, strp, IQ2000_OPERAND_CM_3FUNC, &fields->f_cm_3func);
372 break;
373 case IQ2000_OPERAND_CM_3Z :
374 errmsg = cgen_parse_unsigned_integer (cd, strp, IQ2000_OPERAND_CM_3Z, &fields->f_cm_3z);
375 break;
376 case IQ2000_OPERAND_CM_4FUNC :
377 errmsg = cgen_parse_unsigned_integer (cd, strp, IQ2000_OPERAND_CM_4FUNC, &fields->f_cm_4func);
378 break;
379 case IQ2000_OPERAND_CM_4Z :
380 errmsg = cgen_parse_unsigned_integer (cd, strp, IQ2000_OPERAND_CM_4Z, &fields->f_cm_4z);
381 break;
382 case IQ2000_OPERAND_COUNT :
383 errmsg = cgen_parse_unsigned_integer (cd, strp, IQ2000_OPERAND_COUNT, &fields->f_count);
384 break;
385 case IQ2000_OPERAND_EXECODE :
386 errmsg = cgen_parse_unsigned_integer (cd, strp, IQ2000_OPERAND_EXECODE, &fields->f_excode);
387 break;
388 case IQ2000_OPERAND_F_INDEX :
389 errmsg = cgen_parse_unsigned_integer (cd, strp, IQ2000_OPERAND_F_INDEX, &fields->f_index);
390 break;
391 case IQ2000_OPERAND_HI16 :
392 errmsg = parse_hi16 (cd, strp, IQ2000_OPERAND_HI16, &fields->f_imm);
393 break;
394 case IQ2000_OPERAND_IMM :
395 errmsg = parse_imm (cd, strp, IQ2000_OPERAND_IMM, &fields->f_imm);
396 break;
397 case IQ2000_OPERAND_JMPTARG :
398 {
399 bfd_vma value;
400 errmsg = cgen_parse_address (cd, strp, IQ2000_OPERAND_JMPTARG, 0, NULL, & value);
401 fields->f_jtarg = value;
402 }
403 break;
404 case IQ2000_OPERAND_JMPTARGQ10 :
405 {
406 bfd_vma value;
407 errmsg = parse_jtargq10 (cd, strp, IQ2000_OPERAND_JMPTARGQ10, 0, NULL, & value);
408 fields->f_jtargq10 = value;
409 }
410 break;
411 case IQ2000_OPERAND_LO16 :
412 errmsg = parse_lo16 (cd, strp, IQ2000_OPERAND_LO16, &fields->f_imm);
413 break;
414 case IQ2000_OPERAND_MASK :
415 errmsg = cgen_parse_unsigned_integer (cd, strp, IQ2000_OPERAND_MASK, &fields->f_mask);
416 break;
417 case IQ2000_OPERAND_MASKL :
418 errmsg = cgen_parse_unsigned_integer (cd, strp, IQ2000_OPERAND_MASKL, &fields->f_maskl);
419 break;
420 case IQ2000_OPERAND_MASKQ10 :
421 errmsg = cgen_parse_unsigned_integer (cd, strp, IQ2000_OPERAND_MASKQ10, &fields->f_maskq10);
422 break;
423 case IQ2000_OPERAND_MASKR :
424 errmsg = cgen_parse_unsigned_integer (cd, strp, IQ2000_OPERAND_MASKR, &fields->f_rs);
425 break;
426 case IQ2000_OPERAND_MLO16 :
427 errmsg = parse_mlo16 (cd, strp, IQ2000_OPERAND_MLO16, &fields->f_imm);
428 break;
429 case IQ2000_OPERAND_OFFSET :
430 {
431 bfd_vma value;
432 errmsg = cgen_parse_address (cd, strp, IQ2000_OPERAND_OFFSET, 0, NULL, & value);
433 fields->f_offset = value;
434 }
435 break;
436 case IQ2000_OPERAND_RD :
437 errmsg = cgen_parse_keyword (cd, strp, & iq2000_cgen_opval_gr_names, & fields->f_rd);
438 break;
439 case IQ2000_OPERAND_RD_RS :
440 errmsg = cgen_parse_keyword (cd, strp, & iq2000_cgen_opval_gr_names, & fields->f_rd_rs);
441 break;
442 case IQ2000_OPERAND_RD_RT :
443 errmsg = cgen_parse_keyword (cd, strp, & iq2000_cgen_opval_gr_names, & fields->f_rd_rt);
444 break;
445 case IQ2000_OPERAND_RS :
446 errmsg = cgen_parse_keyword (cd, strp, & iq2000_cgen_opval_gr_names, & fields->f_rs);
447 break;
448 case IQ2000_OPERAND_RT :
449 errmsg = cgen_parse_keyword (cd, strp, & iq2000_cgen_opval_gr_names, & fields->f_rt);
450 break;
451 case IQ2000_OPERAND_RT_RS :
452 errmsg = cgen_parse_keyword (cd, strp, & iq2000_cgen_opval_gr_names, & fields->f_rt_rs);
453 break;
454 case IQ2000_OPERAND_SHAMT :
455 errmsg = cgen_parse_unsigned_integer (cd, strp, IQ2000_OPERAND_SHAMT, &fields->f_shamt);
456 break;
457
458 default :
459 /* xgettext:c-format */
460 fprintf (stderr, _("Unrecognized field %d while parsing.\n"), opindex);
461 abort ();
462 }
463
464 return errmsg;
465 }
466
467 cgen_parse_fn * const iq2000_cgen_parse_handlers[] =
468 {
469 parse_insn_normal,
470 };
471
472 void
iq2000_cgen_init_asm(cd)473 iq2000_cgen_init_asm (cd)
474 CGEN_CPU_DESC cd;
475 {
476 iq2000_cgen_init_opcode_table (cd);
477 iq2000_cgen_init_ibld_table (cd);
478 cd->parse_handlers = & iq2000_cgen_parse_handlers[0];
479 cd->parse_operand = iq2000_cgen_parse_operand;
480 }
481
482
483
484 /* Regex construction routine.
485
486 This translates an opcode syntax string into a regex string,
487 by replacing any non-character syntax element (such as an
488 opcode) with the pattern '.*'
489
490 It then compiles the regex and stores it in the opcode, for
491 later use by iq2000_cgen_assemble_insn
492
493 Returns NULL for success, an error message for failure. */
494
495 char *
iq2000_cgen_build_insn_regex(CGEN_INSN * insn)496 iq2000_cgen_build_insn_regex (CGEN_INSN *insn)
497 {
498 CGEN_OPCODE *opc = (CGEN_OPCODE *) CGEN_INSN_OPCODE (insn);
499 const char *mnem = CGEN_INSN_MNEMONIC (insn);
500 char rxbuf[CGEN_MAX_RX_ELEMENTS];
501 char *rx = rxbuf;
502 const CGEN_SYNTAX_CHAR_TYPE *syn;
503 int reg_err;
504
505 syn = CGEN_SYNTAX_STRING (CGEN_OPCODE_SYNTAX (opc));
506
507 /* Mnemonics come first in the syntax string. */
508 if (! CGEN_SYNTAX_MNEMONIC_P (* syn))
509 return _("missing mnemonic in syntax string");
510 ++syn;
511
512 /* Generate a case sensitive regular expression that emulates case
513 insensitive matching in the "C" locale. We cannot generate a case
514 insensitive regular expression because in Turkish locales, 'i' and 'I'
515 are not equal modulo case conversion. */
516
517 /* Copy the literal mnemonic out of the insn. */
518 for (; *mnem; mnem++)
519 {
520 char c = *mnem;
521
522 if (ISALPHA (c))
523 {
524 *rx++ = '[';
525 *rx++ = TOLOWER (c);
526 *rx++ = TOUPPER (c);
527 *rx++ = ']';
528 }
529 else
530 *rx++ = c;
531 }
532
533 /* Copy any remaining literals from the syntax string into the rx. */
534 for(; * syn != 0 && rx <= rxbuf + (CGEN_MAX_RX_ELEMENTS - 7 - 4); ++syn)
535 {
536 if (CGEN_SYNTAX_CHAR_P (* syn))
537 {
538 char c = CGEN_SYNTAX_CHAR (* syn);
539
540 switch (c)
541 {
542 /* Escape any regex metacharacters in the syntax. */
543 case '.': case '[': case '\\':
544 case '*': case '^': case '$':
545
546 #ifdef CGEN_ESCAPE_EXTENDED_REGEX
547 case '?': case '{': case '}':
548 case '(': case ')': case '*':
549 case '|': case '+': case ']':
550 #endif
551 *rx++ = '\\';
552 *rx++ = c;
553 break;
554
555 default:
556 if (ISALPHA (c))
557 {
558 *rx++ = '[';
559 *rx++ = TOLOWER (c);
560 *rx++ = TOUPPER (c);
561 *rx++ = ']';
562 }
563 else
564 *rx++ = c;
565 break;
566 }
567 }
568 else
569 {
570 /* Replace non-syntax fields with globs. */
571 *rx++ = '.';
572 *rx++ = '*';
573 }
574 }
575
576 /* Trailing whitespace ok. */
577 * rx++ = '[';
578 * rx++ = ' ';
579 * rx++ = '\t';
580 * rx++ = ']';
581 * rx++ = '*';
582
583 /* But anchor it after that. */
584 * rx++ = '$';
585 * rx = '\0';
586
587 CGEN_INSN_RX (insn) = xmalloc (sizeof (regex_t));
588 reg_err = regcomp ((regex_t *) CGEN_INSN_RX (insn), rxbuf, REG_NOSUB);
589
590 if (reg_err == 0)
591 return NULL;
592 else
593 {
594 static char msg[80];
595
596 regerror (reg_err, (regex_t *) CGEN_INSN_RX (insn), msg, 80);
597 regfree ((regex_t *) CGEN_INSN_RX (insn));
598 free (CGEN_INSN_RX (insn));
599 (CGEN_INSN_RX (insn)) = NULL;
600 return msg;
601 }
602 }
603
604
605 /* Default insn parser.
606
607 The syntax string is scanned and operands are parsed and stored in FIELDS.
608 Relocs are queued as we go via other callbacks.
609
610 ??? Note that this is currently an all-or-nothing parser. If we fail to
611 parse the instruction, we return 0 and the caller will start over from
612 the beginning. Backtracking will be necessary in parsing subexpressions,
613 but that can be handled there. Not handling backtracking here may get
614 expensive in the case of the m68k. Deal with later.
615
616 Returns NULL for success, an error message for failure. */
617
618 static const char *
parse_insn_normal(CGEN_CPU_DESC cd,const CGEN_INSN * insn,const char ** strp,CGEN_FIELDS * fields)619 parse_insn_normal (CGEN_CPU_DESC cd,
620 const CGEN_INSN *insn,
621 const char **strp,
622 CGEN_FIELDS *fields)
623 {
624 /* ??? Runtime added insns not handled yet. */
625 const CGEN_SYNTAX *syntax = CGEN_INSN_SYNTAX (insn);
626 const char *str = *strp;
627 const char *errmsg;
628 const char *p;
629 const CGEN_SYNTAX_CHAR_TYPE * syn;
630 #ifdef CGEN_MNEMONIC_OPERANDS
631 /* FIXME: wip */
632 int past_opcode_p;
633 #endif
634
635 /* For now we assume the mnemonic is first (there are no leading operands).
636 We can parse it without needing to set up operand parsing.
637 GAS's input scrubber will ensure mnemonics are lowercase, but we may
638 not be called from GAS. */
639 p = CGEN_INSN_MNEMONIC (insn);
640 while (*p && TOLOWER (*p) == TOLOWER (*str))
641 ++p, ++str;
642
643 if (* p)
644 return _("unrecognized instruction");
645
646 #ifndef CGEN_MNEMONIC_OPERANDS
647 if (* str && ! ISSPACE (* str))
648 return _("unrecognized instruction");
649 #endif
650
651 CGEN_INIT_PARSE (cd);
652 cgen_init_parse_operand (cd);
653 #ifdef CGEN_MNEMONIC_OPERANDS
654 past_opcode_p = 0;
655 #endif
656
657 /* We don't check for (*str != '\0') here because we want to parse
658 any trailing fake arguments in the syntax string. */
659 syn = CGEN_SYNTAX_STRING (syntax);
660
661 /* Mnemonics come first for now, ensure valid string. */
662 if (! CGEN_SYNTAX_MNEMONIC_P (* syn))
663 abort ();
664
665 ++syn;
666
667 while (* syn != 0)
668 {
669 /* Non operand chars must match exactly. */
670 if (CGEN_SYNTAX_CHAR_P (* syn))
671 {
672 /* FIXME: While we allow for non-GAS callers above, we assume the
673 first char after the mnemonic part is a space. */
674 /* FIXME: We also take inappropriate advantage of the fact that
675 GAS's input scrubber will remove extraneous blanks. */
676 if (TOLOWER (*str) == TOLOWER (CGEN_SYNTAX_CHAR (* syn)))
677 {
678 #ifdef CGEN_MNEMONIC_OPERANDS
679 if (CGEN_SYNTAX_CHAR(* syn) == ' ')
680 past_opcode_p = 1;
681 #endif
682 ++ syn;
683 ++ str;
684 }
685 else if (*str)
686 {
687 /* Syntax char didn't match. Can't be this insn. */
688 static char msg [80];
689
690 /* xgettext:c-format */
691 sprintf (msg, _("syntax error (expected char `%c', found `%c')"),
692 CGEN_SYNTAX_CHAR(*syn), *str);
693 return msg;
694 }
695 else
696 {
697 /* Ran out of input. */
698 static char msg [80];
699
700 /* xgettext:c-format */
701 sprintf (msg, _("syntax error (expected char `%c', found end of instruction)"),
702 CGEN_SYNTAX_CHAR(*syn));
703 return msg;
704 }
705 continue;
706 }
707
708 /* We have an operand of some sort. */
709 errmsg = cd->parse_operand (cd, CGEN_SYNTAX_FIELD (*syn),
710 &str, fields);
711 if (errmsg)
712 return errmsg;
713
714 /* Done with this operand, continue with next one. */
715 ++ syn;
716 }
717
718 /* If we're at the end of the syntax string, we're done. */
719 if (* syn == 0)
720 {
721 /* FIXME: For the moment we assume a valid `str' can only contain
722 blanks now. IE: We needn't try again with a longer version of
723 the insn and it is assumed that longer versions of insns appear
724 before shorter ones (eg: lsr r2,r3,1 vs lsr r2,r3). */
725 while (ISSPACE (* str))
726 ++ str;
727
728 if (* str != '\0')
729 return _("junk at end of line"); /* FIXME: would like to include `str' */
730
731 return NULL;
732 }
733
734 /* We couldn't parse it. */
735 return _("unrecognized instruction");
736 }
737
738 /* Main entry point.
739 This routine is called for each instruction to be assembled.
740 STR points to the insn to be assembled.
741 We assume all necessary tables have been initialized.
742 The assembled instruction, less any fixups, is stored in BUF.
743 Remember that if CGEN_INT_INSN_P then BUF is an int and thus the value
744 still needs to be converted to target byte order, otherwise BUF is an array
745 of bytes in target byte order.
746 The result is a pointer to the insn's entry in the opcode table,
747 or NULL if an error occured (an error message will have already been
748 printed).
749
750 Note that when processing (non-alias) macro-insns,
751 this function recurses.
752
753 ??? It's possible to make this cpu-independent.
754 One would have to deal with a few minor things.
755 At this point in time doing so would be more of a curiosity than useful
756 [for example this file isn't _that_ big], but keeping the possibility in
757 mind helps keep the design clean. */
758
759 const CGEN_INSN *
iq2000_cgen_assemble_insn(CGEN_CPU_DESC cd,const char * str,CGEN_FIELDS * fields,CGEN_INSN_BYTES_PTR buf,char ** errmsg)760 iq2000_cgen_assemble_insn (CGEN_CPU_DESC cd,
761 const char *str,
762 CGEN_FIELDS *fields,
763 CGEN_INSN_BYTES_PTR buf,
764 char **errmsg)
765 {
766 const char *start;
767 CGEN_INSN_LIST *ilist;
768 const char *parse_errmsg = NULL;
769 const char *insert_errmsg = NULL;
770 int recognized_mnemonic = 0;
771
772 /* Skip leading white space. */
773 while (ISSPACE (* str))
774 ++ str;
775
776 /* The instructions are stored in hashed lists.
777 Get the first in the list. */
778 ilist = CGEN_ASM_LOOKUP_INSN (cd, str);
779
780 /* Keep looking until we find a match. */
781 start = str;
782 for ( ; ilist != NULL ; ilist = CGEN_ASM_NEXT_INSN (ilist))
783 {
784 const CGEN_INSN *insn = ilist->insn;
785 recognized_mnemonic = 1;
786
787 #ifdef CGEN_VALIDATE_INSN_SUPPORTED
788 /* Not usually needed as unsupported opcodes
789 shouldn't be in the hash lists. */
790 /* Is this insn supported by the selected cpu? */
791 if (! iq2000_cgen_insn_supported (cd, insn))
792 continue;
793 #endif
794 /* If the RELAXED attribute is set, this is an insn that shouldn't be
795 chosen immediately. Instead, it is used during assembler/linker
796 relaxation if possible. */
797 if (CGEN_INSN_ATTR_VALUE (insn, CGEN_INSN_RELAXED) != 0)
798 continue;
799
800 str = start;
801
802 /* Skip this insn if str doesn't look right lexically. */
803 if (CGEN_INSN_RX (insn) != NULL &&
804 regexec ((regex_t *) CGEN_INSN_RX (insn), str, 0, NULL, 0) == REG_NOMATCH)
805 continue;
806
807 /* Allow parse/insert handlers to obtain length of insn. */
808 CGEN_FIELDS_BITSIZE (fields) = CGEN_INSN_BITSIZE (insn);
809
810 parse_errmsg = CGEN_PARSE_FN (cd, insn) (cd, insn, & str, fields);
811 if (parse_errmsg != NULL)
812 continue;
813
814 /* ??? 0 is passed for `pc'. */
815 insert_errmsg = CGEN_INSERT_FN (cd, insn) (cd, insn, fields, buf,
816 (bfd_vma) 0);
817 if (insert_errmsg != NULL)
818 continue;
819
820 /* It is up to the caller to actually output the insn and any
821 queued relocs. */
822 return insn;
823 }
824
825 {
826 static char errbuf[150];
827 #ifdef CGEN_VERBOSE_ASSEMBLER_ERRORS
828 const char *tmp_errmsg;
829
830 /* If requesting verbose error messages, use insert_errmsg.
831 Failing that, use parse_errmsg. */
832 tmp_errmsg = (insert_errmsg ? insert_errmsg :
833 parse_errmsg ? parse_errmsg :
834 recognized_mnemonic ?
835 _("unrecognized form of instruction") :
836 _("unrecognized instruction"));
837
838 if (strlen (start) > 50)
839 /* xgettext:c-format */
840 sprintf (errbuf, "%s `%.50s...'", tmp_errmsg, start);
841 else
842 /* xgettext:c-format */
843 sprintf (errbuf, "%s `%.50s'", tmp_errmsg, start);
844 #else
845 if (strlen (start) > 50)
846 /* xgettext:c-format */
847 sprintf (errbuf, _("bad instruction `%.50s...'"), start);
848 else
849 /* xgettext:c-format */
850 sprintf (errbuf, _("bad instruction `%.50s'"), start);
851 #endif
852
853 *errmsg = errbuf;
854 return NULL;
855 }
856 }
857
858 #if 0 /* This calls back to GAS which we can't do without care. */
859
860 /* Record each member of OPVALS in the assembler's symbol table.
861 This lets GAS parse registers for us.
862 ??? Interesting idea but not currently used. */
863
864 /* Record each member of OPVALS in the assembler's symbol table.
865 FIXME: Not currently used. */
866
867 void
868 iq2000_cgen_asm_hash_keywords (CGEN_CPU_DESC cd, CGEN_KEYWORD *opvals)
869 {
870 CGEN_KEYWORD_SEARCH search = cgen_keyword_search_init (opvals, NULL);
871 const CGEN_KEYWORD_ENTRY * ke;
872
873 while ((ke = cgen_keyword_search_next (& search)) != NULL)
874 {
875 #if 0 /* Unnecessary, should be done in the search routine. */
876 if (! iq2000_cgen_opval_supported (ke))
877 continue;
878 #endif
879 cgen_asm_record_register (cd, ke->name, ke->value);
880 }
881 }
882
883 #endif /* 0 */
884