source: vendor/binutils/current/opcodes/ip2k-asm.c

Last change on this file was 608, checked in by (none), 22 years ago

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1/* Assembler interface for targets using CGEN. -*- C -*-
2 CGEN: Cpu tools GENerator
3
4THIS FILE IS MACHINE GENERATED WITH CGEN.
5- the resultant file is machine generated, cgen-asm.in isn't
6
7Copyright 1996, 1997, 1998, 1999, 2000, 2001 Free Software Foundation, Inc.
8
9This file is part of the GNU Binutils and GDB, the GNU debugger.
10
11This program is free software; you can redistribute it and/or modify
12it under the terms of the GNU General Public License as published by
13the Free Software Foundation; either version 2, or (at your option)
14any later version.
15
16This program is distributed in the hope that it will be useful,
17but WITHOUT ANY WARRANTY; without even the implied warranty of
18MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
19GNU General Public License for more details.
20
21You should have received a copy of the GNU General Public License
22along with this program; if not, write to the Free Software Foundation, Inc.,
2359 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 "ip2k-desc.h"
34#include "ip2k-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
45static const char * parse_insn_normal
46 PARAMS ((CGEN_CPU_DESC, const CGEN_INSN *, const char **, CGEN_FIELDS *));
47
48
49/* -- assembler routines inserted here. */
50
51/* -- asm.c */
52
53#define PARSE_FUNC_DECL(name) \
54static const char *name PARAMS ((CGEN_CPU_DESC, const char **, int, long *))
55
56PARSE_FUNC_DECL (parse_fr);
57PARSE_FUNC_DECL (parse_addr16);
58PARSE_FUNC_DECL (parse_addr16_p);
59PARSE_FUNC_DECL (parse_addr16_cjp);
60PARSE_FUNC_DECL (parse_lit8);
61PARSE_FUNC_DECL (parse_bit3);
62
63
64static const char *
65parse_fr (cd, strp, opindex, valuep)
66 CGEN_CPU_DESC cd;
67 const char **strp;
68 int opindex;
69 long *valuep;
70{
71 const char *errmsg;
72 const char *old_strp;
73 char *afteroffset;
74 enum cgen_parse_operand_result result_type;
75 bfd_vma value;
76 extern CGEN_KEYWORD ip2k_cgen_opval_register_names;
77 bfd_vma tempvalue;
78
79 old_strp = *strp;
80 afteroffset = NULL;
81
82
83 /* Check here to see if you're about to try parsing a w as the first arg */
84 /* and return an error if you are. */
85 if ( (strncmp(*strp,"w",1)==0) || (strncmp(*strp,"W",1)==0) )
86 {
87 (*strp)++;
88
89 if ( (strncmp(*strp,",",1)==0) || ISSPACE(**strp) )
90 {
91 /* We've been passed a w. Return with an error message so that */
92 /* cgen will try the next parsing option. */
93 errmsg = _("W keyword invalid in FR operand slot.");
94 return errmsg;
95 }
96 *strp = old_strp;
97 }
98
99
100 /* Attempt parse as register keyword. */
101 /* old_strp = *strp; */
102
103 errmsg = cgen_parse_keyword (cd, strp, & ip2k_cgen_opval_register_names,
104 valuep);
105 if ( *strp != NULL )
106 if (errmsg == NULL)
107 return errmsg;
108
109 /* Attempt to parse for "(IP)" */
110 afteroffset = strstr(*strp,"(IP)");
111
112 if ( afteroffset == NULL)
113 {
114 /* Make sure it's not in lower case */
115 afteroffset = strstr(*strp,"(ip)");
116 }
117
118 if ( afteroffset != NULL )
119 {
120 if ( afteroffset != *strp )
121 {
122 /* Invalid offset present.*/
123 errmsg = _("offset(IP) is not a valid form");
124 return errmsg;
125 }
126 else
127 {
128 *strp += 4;
129 *valuep = 0;
130 errmsg = NULL;
131 return errmsg;
132 }
133 }
134
135 /* Attempt to parse for DP. ex: mov w, offset(DP) */
136 /* mov offset(DP),w */
137
138 /* Try parsing it as an address and see what comes back */
139
140 afteroffset = strstr(*strp,"(DP)");
141
142 if ( afteroffset == NULL)
143 {
144 /* Maybe it's in lower case */
145 afteroffset = strstr(*strp,"(dp)");
146 }
147
148 if ( afteroffset != NULL )
149 {
150 if ( afteroffset == *strp )
151 {
152 /* No offset present. Use 0 by default. */
153 tempvalue = 0;
154 errmsg = NULL;
155 }
156 else
157 {
158 errmsg = cgen_parse_address (cd, strp, opindex,
159 BFD_RELOC_IP2K_FR_OFFSET,
160 & result_type, & tempvalue);
161 }
162
163 if (errmsg == NULL)
164 {
165 if (tempvalue <= 127)
166 {
167 /* Value is ok. Fix up the first 2 bits and return */
168 *valuep = 0x0100 | tempvalue;
169 *strp += 4; /* skip over the (DP) in *strp */
170 return errmsg;
171 }
172 else
173 {
174 /* Found something there in front of (DP) but it's out
175 of range. */
176 errmsg = _("(DP) offset out of range.");
177 return errmsg;
178 }
179 }
180 }
181
182
183 /* Attempt to parse for SP. ex: mov w, offset(SP) */
184 /* mov offset(SP), w */
185
186
187 afteroffset = strstr(*strp,"(SP)");
188
189 if (afteroffset == NULL)
190 {
191 /* Maybe it's in lower case. */
192 afteroffset = strstr(*strp, "(sp)");
193 }
194
195 if ( afteroffset != NULL )
196 {
197 if ( afteroffset == *strp )
198 {
199 /* No offset present. Use 0 by default. */
200 tempvalue = 0;
201 errmsg = NULL;
202 }
203 else
204 {
205 errmsg = cgen_parse_address (cd, strp, opindex,
206 BFD_RELOC_IP2K_FR_OFFSET,
207 & result_type, & tempvalue);
208 }
209 if (errmsg == NULL)
210 {
211 if (tempvalue <= 127)
212 {
213 /* Value is ok. Fix up the first 2 bits and return */
214 *valuep = 0x0180 | tempvalue;
215 *strp += 4; /* skip over the (SP) in *strp */
216 return errmsg;
217 }
218 else
219 {
220 /* Found something there in front of (SP) but it's out
221 of range. */
222 errmsg = _("(SP) offset out of range.");
223 return errmsg;
224 }
225
226 }
227 }
228
229
230 /* Attempt to parse as an address. */
231 *strp = old_strp;
232 errmsg = cgen_parse_address (cd, strp, opindex, BFD_RELOC_IP2K_FR9,
233 & result_type, & value);
234 if (errmsg == NULL)
235 {
236 *valuep = value;
237
238 /* if a parenthesis is found, warn about invalid form */
239
240 if (**strp == '(')
241 {
242 errmsg = _("illegal use of parentheses");
243 }
244 /* if a numeric value is specified, ensure that it is between
245 1 and 255 */
246 else if (result_type == CGEN_PARSE_OPERAND_RESULT_NUMBER)
247 {
248 if (value < 0x1 || value > 0xff)
249 errmsg = _("operand out of range (not between 1 and 255)");
250 }
251 }
252 return errmsg;
253}
254
255static const char *
256parse_addr16 (cd, strp, opindex, valuep)
257 CGEN_CPU_DESC cd;
258 const char **strp;
259 int opindex;
260 long *valuep;
261{
262 const char *errmsg;
263 enum cgen_parse_operand_result result_type;
264 bfd_reloc_code_real_type code = BFD_RELOC_NONE;
265 bfd_vma value;
266
267 if ( opindex == (CGEN_OPERAND_TYPE)IP2K_OPERAND_ADDR16H )
268 code = BFD_RELOC_IP2K_HI8DATA;
269 else if ( opindex == (CGEN_OPERAND_TYPE)IP2K_OPERAND_ADDR16L )
270 code = BFD_RELOC_IP2K_LO8DATA;
271 else
272 {
273 /* Something is very wrong. opindex has to be one of the above. */
274 errmsg = _("parse_addr16: invalid opindex.");
275 return errmsg;
276 }
277
278 errmsg = cgen_parse_address (cd, strp, opindex, code,
279 & result_type, & value);
280 if (errmsg == NULL)
281 {
282 /* We either have a relocation or a number now. */
283 if ( result_type == CGEN_PARSE_OPERAND_RESULT_NUMBER )
284 {
285 /* We got a number back. */
286 if ( code == BFD_RELOC_IP2K_HI8DATA )
287 value >>= 8;
288 else /* code = BFD_RELOC_IP2K_LOW8DATA */
289 value &= 0x00FF;
290 }
291 *valuep = value;
292 }
293
294 return errmsg;
295}
296
297
298static const char *
299parse_addr16_p (cd, strp, opindex, valuep)
300 CGEN_CPU_DESC cd;
301 const char **strp;
302 int opindex;
303 long *valuep;
304{
305 const char *errmsg;
306 enum cgen_parse_operand_result result_type;
307 bfd_reloc_code_real_type code = BFD_RELOC_IP2K_PAGE3;
308 bfd_vma value;
309
310 errmsg = cgen_parse_address (cd, strp, opindex, code,
311 & result_type, & value);
312 if (errmsg == NULL)
313 {
314 if ( result_type == CGEN_PARSE_OPERAND_RESULT_NUMBER )
315 *valuep = (value >> 13) & 0x7;
316 else if ( result_type == CGEN_PARSE_OPERAND_RESULT_QUEUED )
317 *valuep = value;
318 }
319 return errmsg;
320}
321
322
323static const char *
324parse_addr16_cjp (cd, strp, opindex, valuep)
325 CGEN_CPU_DESC cd;
326 const char **strp;
327 int opindex;
328 long *valuep;
329{
330 const char *errmsg;
331 enum cgen_parse_operand_result result_type;
332 bfd_reloc_code_real_type code = BFD_RELOC_NONE;
333 bfd_vma value;
334
335 if ( opindex == (CGEN_OPERAND_TYPE)IP2K_OPERAND_ADDR16CJP )
336 code = BFD_RELOC_IP2K_ADDR16CJP;
337 else if ( opindex == (CGEN_OPERAND_TYPE)IP2K_OPERAND_ADDR16P )
338 code = BFD_RELOC_IP2K_PAGE3;
339
340 errmsg = cgen_parse_address (cd, strp, opindex, code,
341 & result_type, & value);
342 if (errmsg == NULL)
343 {
344 if ( result_type == CGEN_PARSE_OPERAND_RESULT_NUMBER )
345 {
346 if ( (value & 0x1) == 0) /* If the address is even .... */
347 {
348 if ( opindex == (CGEN_OPERAND_TYPE)IP2K_OPERAND_ADDR16CJP )
349 *valuep = (value >> 1) & 0x1FFF; /* Should mask be 1FFF? */
350 else if ( opindex == (CGEN_OPERAND_TYPE)IP2K_OPERAND_ADDR16P )
351 *valuep = (value >> 14) & 0x7;
352 }
353 else
354 errmsg = _("Byte address required. - must be even.");
355 }
356 else if ( result_type == CGEN_PARSE_OPERAND_RESULT_QUEUED )
357 {
358 /* This will happen for things like (s2-s1) where s2 and s1
359 are labels. */
360 *valuep = value;
361 }
362 else
363 errmsg = _("cgen_parse_address returned a symbol. Literal required.");
364 }
365 return errmsg;
366}
367
368
369static const char *
370parse_lit8 (cd, strp, opindex, valuep)
371 CGEN_CPU_DESC cd;
372 const char **strp;
373 int opindex;
374 long *valuep;
375{
376 const char *errmsg;
377 enum cgen_parse_operand_result result_type;
378 bfd_reloc_code_real_type code = BFD_RELOC_NONE;
379 bfd_vma value;
380
381 /* Parse %OP relocating operators. */
382 if (strncmp (*strp, "%bank", 5) == 0)
383 {
384 *strp += 5;
385 code = BFD_RELOC_IP2K_BANK;
386 }
387 else if (strncmp (*strp, "%lo8data", 8) == 0)
388 {
389 *strp += 8;
390 code = BFD_RELOC_IP2K_LO8DATA;
391 }
392 else if (strncmp (*strp, "%hi8data", 8) == 0)
393 {
394 *strp += 8;
395 code = BFD_RELOC_IP2K_HI8DATA;
396 }
397 else if (strncmp (*strp, "%ex8data", 8) == 0)
398 {
399 *strp += 8;
400 code = BFD_RELOC_IP2K_EX8DATA;
401 }
402 else if (strncmp (*strp, "%lo8insn", 8) == 0)
403 {
404 *strp += 8;
405 code = BFD_RELOC_IP2K_LO8INSN;
406 }
407 else if (strncmp (*strp, "%hi8insn", 8) == 0)
408 {
409 *strp += 8;
410 code = BFD_RELOC_IP2K_HI8INSN;
411 }
412
413
414 /* Parse %op operand. */
415 if (code != BFD_RELOC_NONE)
416 {
417 errmsg = cgen_parse_address (cd, strp, opindex, code,
418 & result_type, & value);
419 if ((errmsg == NULL) &&
420 (result_type != CGEN_PARSE_OPERAND_RESULT_QUEUED))
421 errmsg = _("%operator operand is not a symbol");
422
423 *valuep = value;
424 }
425 /* Parse as a number. */
426 else
427 {
428 errmsg = cgen_parse_signed_integer (cd, strp, opindex, valuep);
429
430 /* Truncate to eight bits to accept both signed and unsigned input. */
431 if (errmsg == NULL)
432 *valuep &= 0xFF;
433 }
434
435 return errmsg;
436}
437
438static const char *
439parse_bit3 (cd, strp, opindex, valuep)
440 CGEN_CPU_DESC cd;
441 const char **strp;
442 int opindex;
443 long *valuep;
444{
445 const char *errmsg;
446 char mode = 0;
447 long count = 0;
448 unsigned long value;
449
450 if (strncmp (*strp, "%bit", 4) == 0)
451 {
452 *strp += 4;
453 mode = 1;
454 }
455 else if (strncmp (*strp, "%msbbit", 7) == 0)
456 {
457 *strp += 7;
458 mode = 1;
459 }
460 else if (strncmp (*strp, "%lsbbit", 7) == 0)
461 {
462 *strp += 7;
463 mode = 2;
464 }
465
466 errmsg = cgen_parse_signed_integer (cd, strp, opindex, valuep);
467 if (errmsg)
468 return errmsg;
469
470 if (mode)
471 {
472 value = (unsigned long) *valuep;
473 if (value == 0)
474 {
475 errmsg = _("Attempt to find bit index of 0");
476 return errmsg;
477 }
478
479 if (mode == 1)
480 {
481 count = 31;
482 while ((value & 0x80000000) == 0)
483 {
484 count--;
485 value <<= 1;
486 }
487 }
488 else if (mode == 2)
489 {
490 count = 0;
491 while ((value & 0x00000001) == 0)
492 {
493 count++;
494 value >>= 1;
495 }
496 }
497
498 *valuep = count;
499 }
500
501 return errmsg;
502}
503
504
505/* -- dis.c */
506
507const char * ip2k_cgen_parse_operand
508 PARAMS ((CGEN_CPU_DESC, int, const char **, CGEN_FIELDS *));
509
510/* Main entry point for operand parsing.
511
512 This function is basically just a big switch statement. Earlier versions
513 used tables to look up the function to use, but
514 - if the table contains both assembler and disassembler functions then
515 the disassembler contains much of the assembler and vice-versa,
516 - there's a lot of inlining possibilities as things grow,
517 - using a switch statement avoids the function call overhead.
518
519 This function could be moved into `parse_insn_normal', but keeping it
520 separate makes clear the interface between `parse_insn_normal' and each of
521 the handlers. */
522
523const char *
524ip2k_cgen_parse_operand (cd, opindex, strp, fields)
525 CGEN_CPU_DESC cd;
526 int opindex;
527 const char ** strp;
528 CGEN_FIELDS * fields;
529{
530 const char * errmsg = NULL;
531 /* Used by scalar operands that still need to be parsed. */
532 long junk ATTRIBUTE_UNUSED;
533
534 switch (opindex)
535 {
536 case IP2K_OPERAND_ADDR16CJP :
537 errmsg = parse_addr16_cjp (cd, strp, IP2K_OPERAND_ADDR16CJP, &fields->f_addr16cjp);
538 break;
539 case IP2K_OPERAND_ADDR16H :
540 errmsg = parse_addr16 (cd, strp, IP2K_OPERAND_ADDR16H, &fields->f_imm8);
541 break;
542 case IP2K_OPERAND_ADDR16L :
543 errmsg = parse_addr16 (cd, strp, IP2K_OPERAND_ADDR16L, &fields->f_imm8);
544 break;
545 case IP2K_OPERAND_ADDR16P :
546 errmsg = parse_addr16_cjp (cd, strp, IP2K_OPERAND_ADDR16P, &fields->f_page3);
547 break;
548 case IP2K_OPERAND_BITNO :
549 errmsg = parse_bit3 (cd, strp, IP2K_OPERAND_BITNO, &fields->f_bitno);
550 break;
551 case IP2K_OPERAND_CBIT :
552 errmsg = cgen_parse_unsigned_integer (cd, strp, IP2K_OPERAND_CBIT, &junk);
553 break;
554 case IP2K_OPERAND_DCBIT :
555 errmsg = cgen_parse_unsigned_integer (cd, strp, IP2K_OPERAND_DCBIT, &junk);
556 break;
557 case IP2K_OPERAND_FR :
558 errmsg = parse_fr (cd, strp, IP2K_OPERAND_FR, &fields->f_reg);
559 break;
560 case IP2K_OPERAND_LIT8 :
561 errmsg = parse_lit8 (cd, strp, IP2K_OPERAND_LIT8, &fields->f_imm8);
562 break;
563 case IP2K_OPERAND_PABITS :
564 errmsg = cgen_parse_unsigned_integer (cd, strp, IP2K_OPERAND_PABITS, &junk);
565 break;
566 case IP2K_OPERAND_RETI3 :
567 errmsg = cgen_parse_unsigned_integer (cd, strp, IP2K_OPERAND_RETI3, &fields->f_reti3);
568 break;
569 case IP2K_OPERAND_ZBIT :
570 errmsg = cgen_parse_unsigned_integer (cd, strp, IP2K_OPERAND_ZBIT, &junk);
571 break;
572
573 default :
574 /* xgettext:c-format */
575 fprintf (stderr, _("Unrecognized field %d while parsing.\n"), opindex);
576 abort ();
577 }
578
579 return errmsg;
580}
581
582cgen_parse_fn * const ip2k_cgen_parse_handlers[] =
583{
584 parse_insn_normal,
585};
586
587void
588ip2k_cgen_init_asm (cd)
589 CGEN_CPU_DESC cd;
590{
591 ip2k_cgen_init_opcode_table (cd);
592 ip2k_cgen_init_ibld_table (cd);
593 cd->parse_handlers = & ip2k_cgen_parse_handlers[0];
594 cd->parse_operand = ip2k_cgen_parse_operand;
595}
596
597
598
599
600/* Regex construction routine.
601
602 This translates an opcode syntax string into a regex string,
603 by replacing any non-character syntax element (such as an
604 opcode) with the pattern '.*'
605
606 It then compiles the regex and stores it in the opcode, for
607 later use by ip2k_cgen_assemble_insn
608
609 Returns NULL for success, an error message for failure. */
610
611char *
612ip2k_cgen_build_insn_regex (insn)
613 CGEN_INSN *insn;
614{
615 CGEN_OPCODE *opc = (CGEN_OPCODE *) CGEN_INSN_OPCODE (insn);
616 const char *mnem = CGEN_INSN_MNEMONIC (insn);
617 char rxbuf[CGEN_MAX_RX_ELEMENTS];
618 char *rx = rxbuf;
619 const CGEN_SYNTAX_CHAR_TYPE *syn;
620 int reg_err;
621
622 syn = CGEN_SYNTAX_STRING (CGEN_OPCODE_SYNTAX (opc));
623
624 /* Mnemonics come first in the syntax string. */
625 if (! CGEN_SYNTAX_MNEMONIC_P (* syn))
626 return _("missing mnemonic in syntax string");
627 ++syn;
628
629 /* Generate a case sensitive regular expression that emulates case
630 insensitive matching in the "C" locale. We cannot generate a case
631 insensitive regular expression because in Turkish locales, 'i' and 'I'
632 are not equal modulo case conversion. */
633
634 /* Copy the literal mnemonic out of the insn. */
635 for (; *mnem; mnem++)
636 {
637 char c = *mnem;
638
639 if (ISALPHA (c))
640 {
641 *rx++ = '[';
642 *rx++ = TOLOWER (c);
643 *rx++ = TOUPPER (c);
644 *rx++ = ']';
645 }
646 else
647 *rx++ = c;
648 }
649
650 /* Copy any remaining literals from the syntax string into the rx. */
651 for(; * syn != 0 && rx <= rxbuf + (CGEN_MAX_RX_ELEMENTS - 7 - 4); ++syn)
652 {
653 if (CGEN_SYNTAX_CHAR_P (* syn))
654 {
655 char c = CGEN_SYNTAX_CHAR (* syn);
656
657 switch (c)
658 {
659 /* Escape any regex metacharacters in the syntax. */
660 case '.': case '[': case '\\':
661 case '*': case '^': case '$':
662
663#ifdef CGEN_ESCAPE_EXTENDED_REGEX
664 case '?': case '{': case '}':
665 case '(': case ')': case '*':
666 case '|': case '+': case ']':
667#endif
668 *rx++ = '\\';
669 *rx++ = c;
670 break;
671
672 default:
673 if (ISALPHA (c))
674 {
675 *rx++ = '[';
676 *rx++ = TOLOWER (c);
677 *rx++ = TOUPPER (c);
678 *rx++ = ']';
679 }
680 else
681 *rx++ = c;
682 break;
683 }
684 }
685 else
686 {
687 /* Replace non-syntax fields with globs. */
688 *rx++ = '.';
689 *rx++ = '*';
690 }
691 }
692
693 /* Trailing whitespace ok. */
694 * rx++ = '[';
695 * rx++ = ' ';
696 * rx++ = '\t';
697 * rx++ = ']';
698 * rx++ = '*';
699
700 /* But anchor it after that. */
701 * rx++ = '$';
702 * rx = '\0';
703
704 CGEN_INSN_RX (insn) = xmalloc (sizeof (regex_t));
705 reg_err = regcomp ((regex_t *) CGEN_INSN_RX (insn), rxbuf, REG_NOSUB);
706
707 if (reg_err == 0)
708 return NULL;
709 else
710 {
711 static char msg[80];
712
713 regerror (reg_err, (regex_t *) CGEN_INSN_RX (insn), msg, 80);
714 regfree ((regex_t *) CGEN_INSN_RX (insn));
715 free (CGEN_INSN_RX (insn));
716 (CGEN_INSN_RX (insn)) = NULL;
717 return msg;
718 }
719}
720
721
722
723/* Default insn parser.
724
725 The syntax string is scanned and operands are parsed and stored in FIELDS.
726 Relocs are queued as we go via other callbacks.
727
728 ??? Note that this is currently an all-or-nothing parser. If we fail to
729 parse the instruction, we return 0 and the caller will start over from
730 the beginning. Backtracking will be necessary in parsing subexpressions,
731 but that can be handled there. Not handling backtracking here may get
732 expensive in the case of the m68k. Deal with later.
733
734 Returns NULL for success, an error message for failure. */
735
736static const char *
737parse_insn_normal (cd, insn, strp, fields)
738 CGEN_CPU_DESC cd;
739 const CGEN_INSN *insn;
740 const char **strp;
741 CGEN_FIELDS *fields;
742{
743 /* ??? Runtime added insns not handled yet. */
744 const CGEN_SYNTAX *syntax = CGEN_INSN_SYNTAX (insn);
745 const char *str = *strp;
746 const char *errmsg;
747 const char *p;
748 const CGEN_SYNTAX_CHAR_TYPE * syn;
749#ifdef CGEN_MNEMONIC_OPERANDS
750 /* FIXME: wip */
751 int past_opcode_p;
752#endif
753
754 /* For now we assume the mnemonic is first (there are no leading operands).
755 We can parse it without needing to set up operand parsing.
756 GAS's input scrubber will ensure mnemonics are lowercase, but we may
757 not be called from GAS. */
758 p = CGEN_INSN_MNEMONIC (insn);
759 while (*p && TOLOWER (*p) == TOLOWER (*str))
760 ++p, ++str;
761
762 if (* p)
763 return _("unrecognized instruction");
764
765#ifndef CGEN_MNEMONIC_OPERANDS
766 if (* str && ! ISSPACE (* str))
767 return _("unrecognized instruction");
768#endif
769
770 CGEN_INIT_PARSE (cd);
771 cgen_init_parse_operand (cd);
772#ifdef CGEN_MNEMONIC_OPERANDS
773 past_opcode_p = 0;
774#endif
775
776 /* We don't check for (*str != '\0') here because we want to parse
777 any trailing fake arguments in the syntax string. */
778 syn = CGEN_SYNTAX_STRING (syntax);
779
780 /* Mnemonics come first for now, ensure valid string. */
781 if (! CGEN_SYNTAX_MNEMONIC_P (* syn))
782 abort ();
783
784 ++syn;
785
786 while (* syn != 0)
787 {
788 /* Non operand chars must match exactly. */
789 if (CGEN_SYNTAX_CHAR_P (* syn))
790 {
791 /* FIXME: While we allow for non-GAS callers above, we assume the
792 first char after the mnemonic part is a space. */
793 /* FIXME: We also take inappropriate advantage of the fact that
794 GAS's input scrubber will remove extraneous blanks. */
795 if (TOLOWER (*str) == TOLOWER (CGEN_SYNTAX_CHAR (* syn)))
796 {
797#ifdef CGEN_MNEMONIC_OPERANDS
798 if (CGEN_SYNTAX_CHAR(* syn) == ' ')
799 past_opcode_p = 1;
800#endif
801 ++ syn;
802 ++ str;
803 }
804 else if (*str)
805 {
806 /* Syntax char didn't match. Can't be this insn. */
807 static char msg [80];
808
809 /* xgettext:c-format */
810 sprintf (msg, _("syntax error (expected char `%c', found `%c')"),
811 CGEN_SYNTAX_CHAR(*syn), *str);
812 return msg;
813 }
814 else
815 {
816 /* Ran out of input. */
817 static char msg [80];
818
819 /* xgettext:c-format */
820 sprintf (msg, _("syntax error (expected char `%c', found end of instruction)"),
821 CGEN_SYNTAX_CHAR(*syn));
822 return msg;
823 }
824 continue;
825 }
826
827 /* We have an operand of some sort. */
828 errmsg = cd->parse_operand (cd, CGEN_SYNTAX_FIELD (*syn),
829 &str, fields);
830 if (errmsg)
831 return errmsg;
832
833 /* Done with this operand, continue with next one. */
834 ++ syn;
835 }
836
837 /* If we're at the end of the syntax string, we're done. */
838 if (* syn == 0)
839 {
840 /* FIXME: For the moment we assume a valid `str' can only contain
841 blanks now. IE: We needn't try again with a longer version of
842 the insn and it is assumed that longer versions of insns appear
843 before shorter ones (eg: lsr r2,r3,1 vs lsr r2,r3). */
844 while (ISSPACE (* str))
845 ++ str;
846
847 if (* str != '\0')
848 return _("junk at end of line"); /* FIXME: would like to include `str' */
849
850 return NULL;
851 }
852
853 /* We couldn't parse it. */
854 return _("unrecognized instruction");
855}
856
857
858/* Main entry point.
859 This routine is called for each instruction to be assembled.
860 STR points to the insn to be assembled.
861 We assume all necessary tables have been initialized.
862 The assembled instruction, less any fixups, is stored in BUF.
863 Remember that if CGEN_INT_INSN_P then BUF is an int and thus the value
864 still needs to be converted to target byte order, otherwise BUF is an array
865 of bytes in target byte order.
866 The result is a pointer to the insn's entry in the opcode table,
867 or NULL if an error occured (an error message will have already been
868 printed).
869
870 Note that when processing (non-alias) macro-insns,
871 this function recurses.
872
873 ??? It's possible to make this cpu-independent.
874 One would have to deal with a few minor things.
875 At this point in time doing so would be more of a curiosity than useful
876 [for example this file isn't _that_ big], but keeping the possibility in
877 mind helps keep the design clean. */
878
879const CGEN_INSN *
880ip2k_cgen_assemble_insn (cd, str, fields, buf, errmsg)
881 CGEN_CPU_DESC cd;
882 const char *str;
883 CGEN_FIELDS *fields;
884 CGEN_INSN_BYTES_PTR buf;
885 char **errmsg;
886{
887 const char *start;
888 CGEN_INSN_LIST *ilist;
889 const char *parse_errmsg = NULL;
890 const char *insert_errmsg = NULL;
891 int recognized_mnemonic = 0;
892
893 /* Skip leading white space. */
894 while (ISSPACE (* str))
895 ++ str;
896
897 /* The instructions are stored in hashed lists.
898 Get the first in the list. */
899 ilist = CGEN_ASM_LOOKUP_INSN (cd, str);
900
901 /* Keep looking until we find a match. */
902 start = str;
903 for ( ; ilist != NULL ; ilist = CGEN_ASM_NEXT_INSN (ilist))
904 {
905 const CGEN_INSN *insn = ilist->insn;
906 recognized_mnemonic = 1;
907
908#ifdef CGEN_VALIDATE_INSN_SUPPORTED
909 /* Not usually needed as unsupported opcodes
910 shouldn't be in the hash lists. */
911 /* Is this insn supported by the selected cpu? */
912 if (! ip2k_cgen_insn_supported (cd, insn))
913 continue;
914#endif
915 /* If the RELAX attribute is set, this is an insn that shouldn't be
916 chosen immediately. Instead, it is used during assembler/linker
917 relaxation if possible. */
918 if (CGEN_INSN_ATTR_VALUE (insn, CGEN_INSN_RELAX) != 0)
919 continue;
920
921 str = start;
922
923 /* Skip this insn if str doesn't look right lexically. */
924 if (CGEN_INSN_RX (insn) != NULL &&
925 regexec ((regex_t *) CGEN_INSN_RX (insn), str, 0, NULL, 0) == REG_NOMATCH)
926 continue;
927
928 /* Allow parse/insert handlers to obtain length of insn. */
929 CGEN_FIELDS_BITSIZE (fields) = CGEN_INSN_BITSIZE (insn);
930
931 parse_errmsg = CGEN_PARSE_FN (cd, insn) (cd, insn, & str, fields);
932 if (parse_errmsg != NULL)
933 continue;
934
935 /* ??? 0 is passed for `pc'. */
936 insert_errmsg = CGEN_INSERT_FN (cd, insn) (cd, insn, fields, buf,
937 (bfd_vma) 0);
938 if (insert_errmsg != NULL)
939 continue;
940
941 /* It is up to the caller to actually output the insn and any
942 queued relocs. */
943 return insn;
944 }
945
946 {
947 static char errbuf[150];
948#ifdef CGEN_VERBOSE_ASSEMBLER_ERRORS
949 const char *tmp_errmsg;
950
951 /* If requesting verbose error messages, use insert_errmsg.
952 Failing that, use parse_errmsg. */
953 tmp_errmsg = (insert_errmsg ? insert_errmsg :
954 parse_errmsg ? parse_errmsg :
955 recognized_mnemonic ?
956 _("unrecognized form of instruction") :
957 _("unrecognized instruction"));
958
959 if (strlen (start) > 50)
960 /* xgettext:c-format */
961 sprintf (errbuf, "%s `%.50s...'", tmp_errmsg, start);
962 else
963 /* xgettext:c-format */
964 sprintf (errbuf, "%s `%.50s'", tmp_errmsg, start);
965#else
966 if (strlen (start) > 50)
967 /* xgettext:c-format */
968 sprintf (errbuf, _("bad instruction `%.50s...'"), start);
969 else
970 /* xgettext:c-format */
971 sprintf (errbuf, _("bad instruction `%.50s'"), start);
972#endif
973
974 *errmsg = errbuf;
975 return NULL;
976 }
977}
978
979
980#if 0 /* This calls back to GAS which we can't do without care. */
981
982/* Record each member of OPVALS in the assembler's symbol table.
983 This lets GAS parse registers for us.
984 ??? Interesting idea but not currently used. */
985
986/* Record each member of OPVALS in the assembler's symbol table.
987 FIXME: Not currently used. */
988
989void
990ip2k_cgen_asm_hash_keywords (cd, opvals)
991 CGEN_CPU_DESC cd;
992 CGEN_KEYWORD *opvals;
993{
994 CGEN_KEYWORD_SEARCH search = cgen_keyword_search_init (opvals, NULL);
995 const CGEN_KEYWORD_ENTRY * ke;
996
997 while ((ke = cgen_keyword_search_next (& search)) != NULL)
998 {
999#if 0 /* Unnecessary, should be done in the search routine. */
1000 if (! ip2k_cgen_opval_supported (ke))
1001 continue;
1002#endif
1003 cgen_asm_record_register (cd, ke->name, ke->value);
1004 }
1005}
1006
1007#endif /* 0 */
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