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, 2005
8 Free Software Foundation, Inc.
9
10 This file is part of the GNU Binutils and GDB, the GNU debugger.
11
12 This program is free software; you can redistribute it and/or modify
13 it under the terms of the GNU General Public License as published by
14 the Free Software Foundation; either version 2, or (at your option)
15 any later version.
16
17 This program is distributed in the hope that it will be useful,
18 but WITHOUT ANY WARRANTY; without even the implied warranty of
19 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
20 GNU General Public License for more details.
21
22 You should have received a copy of the GNU General Public License
23 along with this program; if not, write to the Free Software Foundation, Inc.,
24 51 Franklin Street - Fifth Floor, Boston, MA 02110-1301, USA. */
25
26 /* ??? Eventually more and more of this stuff can go to cpu-independent files.
27 Keep that in mind. */
28
29 #include "sysdep.h"
30 #include <stdio.h>
31 #include "ansidecl.h"
32 #include "bfd.h"
33 #include "symcat.h"
34 #include "openrisc-desc.h"
35 #include "openrisc-opc.h"
36 #include "opintl.h"
37 #include "xregex.h"
38 #include "libiberty.h"
39 #include "safe-ctype.h"
40
41 #undef min
42 #define min(a,b) ((a) < (b) ? (a) : (b))
43 #undef max
44 #define max(a,b) ((a) > (b) ? (a) : (b))
45
46 static const char * parse_insn_normal
47 (CGEN_CPU_DESC, const CGEN_INSN *, const char **, CGEN_FIELDS *);
48
49 /* -- assembler routines inserted here. */
50
51 /* -- asm.c */
52
53 static const char * MISSING_CLOSING_PARENTHESIS = N_("missing `)'");
54
55 #define CGEN_VERBOSE_ASSEMBLER_ERRORS
56
57 long
openrisc_sign_extend_16bit(long value)58 openrisc_sign_extend_16bit (long value)
59 {
60 return ((value & 0xffff) ^ 0x8000) - 0x8000;
61 }
62
63 /* Handle hi(). */
64
65 static const char *
parse_hi16(CGEN_CPU_DESC cd,const char ** strp,int opindex,long * valuep)66 parse_hi16 (CGEN_CPU_DESC cd, const char ** strp, int opindex, long * valuep)
67 {
68 const char *errmsg;
69 enum cgen_parse_operand_result result_type;
70 unsigned long ret;
71
72 if (**strp == '#')
73 ++*strp;
74
75 if (strncasecmp (*strp, "hi(", 3) == 0)
76 {
77 bfd_vma value;
78
79 *strp += 3;
80 errmsg = cgen_parse_address (cd, strp, opindex, BFD_RELOC_HI16,
81 & result_type, & value);
82 if (**strp != ')')
83 return MISSING_CLOSING_PARENTHESIS;
84
85 ++*strp;
86 if (errmsg == NULL
87 && result_type == CGEN_PARSE_OPERAND_RESULT_NUMBER)
88 value >>= 16;
89 ret = value;
90 }
91 else
92 {
93 if (**strp == '-')
94 {
95 long value;
96
97 errmsg = cgen_parse_signed_integer (cd, strp, opindex, &value);
98 ret = value;
99 }
100 else
101 {
102 unsigned long value;
103
104 errmsg = cgen_parse_unsigned_integer (cd, strp, opindex, &value);
105 ret = value;
106 }
107 }
108
109 *valuep = ((ret & 0xffff) ^ 0x8000) - 0x8000;
110 return errmsg;
111 }
112
113 /* Handle lo(). */
114
115 static const char *
parse_lo16(CGEN_CPU_DESC cd,const char ** strp,int opindex,long * valuep)116 parse_lo16 (CGEN_CPU_DESC cd, const char ** strp, int opindex, long * valuep)
117 {
118 const char *errmsg;
119 enum cgen_parse_operand_result result_type;
120 unsigned long ret;
121
122 if (**strp == '#')
123 ++*strp;
124
125 if (strncasecmp (*strp, "lo(", 3) == 0)
126 {
127 bfd_vma value;
128
129 *strp += 3;
130 errmsg = cgen_parse_address (cd, strp, opindex, BFD_RELOC_LO16,
131 & result_type, & value);
132 if (**strp != ')')
133 return MISSING_CLOSING_PARENTHESIS;
134
135 ++*strp;
136 ret = value;
137 }
138 else
139 {
140 if (**strp == '-')
141 {
142 long value;
143
144 errmsg = cgen_parse_signed_integer (cd, strp, opindex, &value);
145 ret = value;
146 }
147 else
148 {
149 unsigned long value;
150
151 errmsg = cgen_parse_unsigned_integer (cd, strp, opindex, &value);
152 ret = value;
153 }
154 }
155
156 *valuep = ((ret & 0xffff) ^ 0x8000) - 0x8000;
157 return errmsg;
158 }
159
160 /* -- */
161
162 const char * openrisc_cgen_parse_operand
163 (CGEN_CPU_DESC, int, const char **, CGEN_FIELDS *);
164
165 /* Main entry point for operand parsing.
166
167 This function is basically just a big switch statement. Earlier versions
168 used tables to look up the function to use, but
169 - if the table contains both assembler and disassembler functions then
170 the disassembler contains much of the assembler and vice-versa,
171 - there's a lot of inlining possibilities as things grow,
172 - using a switch statement avoids the function call overhead.
173
174 This function could be moved into `parse_insn_normal', but keeping it
175 separate makes clear the interface between `parse_insn_normal' and each of
176 the handlers. */
177
178 const char *
openrisc_cgen_parse_operand(CGEN_CPU_DESC cd,int opindex,const char ** strp,CGEN_FIELDS * fields)179 openrisc_cgen_parse_operand (CGEN_CPU_DESC cd,
180 int opindex,
181 const char ** strp,
182 CGEN_FIELDS * fields)
183 {
184 const char * errmsg = NULL;
185 /* Used by scalar operands that still need to be parsed. */
186 long junk ATTRIBUTE_UNUSED;
187
188 switch (opindex)
189 {
190 case OPENRISC_OPERAND_ABS_26 :
191 {
192 bfd_vma value = 0;
193 errmsg = cgen_parse_address (cd, strp, OPENRISC_OPERAND_ABS_26, 0, NULL, & value);
194 fields->f_abs26 = value;
195 }
196 break;
197 case OPENRISC_OPERAND_DISP_26 :
198 {
199 bfd_vma value = 0;
200 errmsg = cgen_parse_address (cd, strp, OPENRISC_OPERAND_DISP_26, 0, NULL, & value);
201 fields->f_disp26 = value;
202 }
203 break;
204 case OPENRISC_OPERAND_HI16 :
205 errmsg = parse_hi16 (cd, strp, OPENRISC_OPERAND_HI16, (long *) (& fields->f_simm16));
206 break;
207 case OPENRISC_OPERAND_LO16 :
208 errmsg = parse_lo16 (cd, strp, OPENRISC_OPERAND_LO16, (long *) (& fields->f_lo16));
209 break;
210 case OPENRISC_OPERAND_OP_F_23 :
211 errmsg = cgen_parse_unsigned_integer (cd, strp, OPENRISC_OPERAND_OP_F_23, (unsigned long *) (& fields->f_op4));
212 break;
213 case OPENRISC_OPERAND_OP_F_3 :
214 errmsg = cgen_parse_unsigned_integer (cd, strp, OPENRISC_OPERAND_OP_F_3, (unsigned long *) (& fields->f_op5));
215 break;
216 case OPENRISC_OPERAND_RA :
217 errmsg = cgen_parse_keyword (cd, strp, & openrisc_cgen_opval_h_gr, & fields->f_r2);
218 break;
219 case OPENRISC_OPERAND_RB :
220 errmsg = cgen_parse_keyword (cd, strp, & openrisc_cgen_opval_h_gr, & fields->f_r3);
221 break;
222 case OPENRISC_OPERAND_RD :
223 errmsg = cgen_parse_keyword (cd, strp, & openrisc_cgen_opval_h_gr, & fields->f_r1);
224 break;
225 case OPENRISC_OPERAND_SIMM_16 :
226 errmsg = cgen_parse_signed_integer (cd, strp, OPENRISC_OPERAND_SIMM_16, (long *) (& fields->f_simm16));
227 break;
228 case OPENRISC_OPERAND_UI16NC :
229 errmsg = parse_lo16 (cd, strp, OPENRISC_OPERAND_UI16NC, (long *) (& fields->f_i16nc));
230 break;
231 case OPENRISC_OPERAND_UIMM_16 :
232 errmsg = cgen_parse_unsigned_integer (cd, strp, OPENRISC_OPERAND_UIMM_16, (unsigned long *) (& fields->f_uimm16));
233 break;
234 case OPENRISC_OPERAND_UIMM_5 :
235 errmsg = cgen_parse_unsigned_integer (cd, strp, OPENRISC_OPERAND_UIMM_5, (unsigned long *) (& fields->f_uimm5));
236 break;
237
238 default :
239 /* xgettext:c-format */
240 fprintf (stderr, _("Unrecognized field %d while parsing.\n"), opindex);
241 abort ();
242 }
243
244 return errmsg;
245 }
246
247 cgen_parse_fn * const openrisc_cgen_parse_handlers[] =
248 {
249 parse_insn_normal,
250 };
251
252 void
openrisc_cgen_init_asm(CGEN_CPU_DESC cd)253 openrisc_cgen_init_asm (CGEN_CPU_DESC cd)
254 {
255 openrisc_cgen_init_opcode_table (cd);
256 openrisc_cgen_init_ibld_table (cd);
257 cd->parse_handlers = & openrisc_cgen_parse_handlers[0];
258 cd->parse_operand = openrisc_cgen_parse_operand;
259 }
260
261
262
263 /* Regex construction routine.
264
265 This translates an opcode syntax string into a regex string,
266 by replacing any non-character syntax element (such as an
267 opcode) with the pattern '.*'
268
269 It then compiles the regex and stores it in the opcode, for
270 later use by openrisc_cgen_assemble_insn
271
272 Returns NULL for success, an error message for failure. */
273
274 char *
openrisc_cgen_build_insn_regex(CGEN_INSN * insn)275 openrisc_cgen_build_insn_regex (CGEN_INSN *insn)
276 {
277 CGEN_OPCODE *opc = (CGEN_OPCODE *) CGEN_INSN_OPCODE (insn);
278 const char *mnem = CGEN_INSN_MNEMONIC (insn);
279 char rxbuf[CGEN_MAX_RX_ELEMENTS];
280 char *rx = rxbuf;
281 const CGEN_SYNTAX_CHAR_TYPE *syn;
282 int reg_err;
283
284 syn = CGEN_SYNTAX_STRING (CGEN_OPCODE_SYNTAX (opc));
285
286 /* Mnemonics come first in the syntax string. */
287 if (! CGEN_SYNTAX_MNEMONIC_P (* syn))
288 return _("missing mnemonic in syntax string");
289 ++syn;
290
291 /* Generate a case sensitive regular expression that emulates case
292 insensitive matching in the "C" locale. We cannot generate a case
293 insensitive regular expression because in Turkish locales, 'i' and 'I'
294 are not equal modulo case conversion. */
295
296 /* Copy the literal mnemonic out of the insn. */
297 for (; *mnem; mnem++)
298 {
299 char c = *mnem;
300
301 if (ISALPHA (c))
302 {
303 *rx++ = '[';
304 *rx++ = TOLOWER (c);
305 *rx++ = TOUPPER (c);
306 *rx++ = ']';
307 }
308 else
309 *rx++ = c;
310 }
311
312 /* Copy any remaining literals from the syntax string into the rx. */
313 for(; * syn != 0 && rx <= rxbuf + (CGEN_MAX_RX_ELEMENTS - 7 - 4); ++syn)
314 {
315 if (CGEN_SYNTAX_CHAR_P (* syn))
316 {
317 char c = CGEN_SYNTAX_CHAR (* syn);
318
319 switch (c)
320 {
321 /* Escape any regex metacharacters in the syntax. */
322 case '.': case '[': case '\\':
323 case '*': case '^': case '$':
324
325 #ifdef CGEN_ESCAPE_EXTENDED_REGEX
326 case '?': case '{': case '}':
327 case '(': case ')': case '*':
328 case '|': case '+': case ']':
329 #endif
330 *rx++ = '\\';
331 *rx++ = c;
332 break;
333
334 default:
335 if (ISALPHA (c))
336 {
337 *rx++ = '[';
338 *rx++ = TOLOWER (c);
339 *rx++ = TOUPPER (c);
340 *rx++ = ']';
341 }
342 else
343 *rx++ = c;
344 break;
345 }
346 }
347 else
348 {
349 /* Replace non-syntax fields with globs. */
350 *rx++ = '.';
351 *rx++ = '*';
352 }
353 }
354
355 /* Trailing whitespace ok. */
356 * rx++ = '[';
357 * rx++ = ' ';
358 * rx++ = '\t';
359 * rx++ = ']';
360 * rx++ = '*';
361
362 /* But anchor it after that. */
363 * rx++ = '$';
364 * rx = '\0';
365
366 CGEN_INSN_RX (insn) = xmalloc (sizeof (regex_t));
367 reg_err = regcomp ((regex_t *) CGEN_INSN_RX (insn), rxbuf, REG_NOSUB);
368
369 if (reg_err == 0)
370 return NULL;
371 else
372 {
373 static char msg[80];
374
375 regerror (reg_err, (regex_t *) CGEN_INSN_RX (insn), msg, 80);
376 regfree ((regex_t *) CGEN_INSN_RX (insn));
377 free (CGEN_INSN_RX (insn));
378 (CGEN_INSN_RX (insn)) = NULL;
379 return msg;
380 }
381 }
382
383
384 /* Default insn parser.
385
386 The syntax string is scanned and operands are parsed and stored in FIELDS.
387 Relocs are queued as we go via other callbacks.
388
389 ??? Note that this is currently an all-or-nothing parser. If we fail to
390 parse the instruction, we return 0 and the caller will start over from
391 the beginning. Backtracking will be necessary in parsing subexpressions,
392 but that can be handled there. Not handling backtracking here may get
393 expensive in the case of the m68k. Deal with later.
394
395 Returns NULL for success, an error message for failure. */
396
397 static const char *
parse_insn_normal(CGEN_CPU_DESC cd,const CGEN_INSN * insn,const char ** strp,CGEN_FIELDS * fields)398 parse_insn_normal (CGEN_CPU_DESC cd,
399 const CGEN_INSN *insn,
400 const char **strp,
401 CGEN_FIELDS *fields)
402 {
403 /* ??? Runtime added insns not handled yet. */
404 const CGEN_SYNTAX *syntax = CGEN_INSN_SYNTAX (insn);
405 const char *str = *strp;
406 const char *errmsg;
407 const char *p;
408 const CGEN_SYNTAX_CHAR_TYPE * syn;
409 #ifdef CGEN_MNEMONIC_OPERANDS
410 /* FIXME: wip */
411 int past_opcode_p;
412 #endif
413
414 /* For now we assume the mnemonic is first (there are no leading operands).
415 We can parse it without needing to set up operand parsing.
416 GAS's input scrubber will ensure mnemonics are lowercase, but we may
417 not be called from GAS. */
418 p = CGEN_INSN_MNEMONIC (insn);
419 while (*p && TOLOWER (*p) == TOLOWER (*str))
420 ++p, ++str;
421
422 if (* p)
423 return _("unrecognized instruction");
424
425 #ifndef CGEN_MNEMONIC_OPERANDS
426 if (* str && ! ISSPACE (* str))
427 return _("unrecognized instruction");
428 #endif
429
430 CGEN_INIT_PARSE (cd);
431 cgen_init_parse_operand (cd);
432 #ifdef CGEN_MNEMONIC_OPERANDS
433 past_opcode_p = 0;
434 #endif
435
436 /* We don't check for (*str != '\0') here because we want to parse
437 any trailing fake arguments in the syntax string. */
438 syn = CGEN_SYNTAX_STRING (syntax);
439
440 /* Mnemonics come first for now, ensure valid string. */
441 if (! CGEN_SYNTAX_MNEMONIC_P (* syn))
442 abort ();
443
444 ++syn;
445
446 while (* syn != 0)
447 {
448 /* Non operand chars must match exactly. */
449 if (CGEN_SYNTAX_CHAR_P (* syn))
450 {
451 /* FIXME: While we allow for non-GAS callers above, we assume the
452 first char after the mnemonic part is a space. */
453 /* FIXME: We also take inappropriate advantage of the fact that
454 GAS's input scrubber will remove extraneous blanks. */
455 if (TOLOWER (*str) == TOLOWER (CGEN_SYNTAX_CHAR (* syn)))
456 {
457 #ifdef CGEN_MNEMONIC_OPERANDS
458 if (CGEN_SYNTAX_CHAR(* syn) == ' ')
459 past_opcode_p = 1;
460 #endif
461 ++ syn;
462 ++ str;
463 }
464 else if (*str)
465 {
466 /* Syntax char didn't match. Can't be this insn. */
467 static char msg [80];
468
469 /* xgettext:c-format */
470 sprintf (msg, _("syntax error (expected char `%c', found `%c')"),
471 CGEN_SYNTAX_CHAR(*syn), *str);
472 return msg;
473 }
474 else
475 {
476 /* Ran out of input. */
477 static char msg [80];
478
479 /* xgettext:c-format */
480 sprintf (msg, _("syntax error (expected char `%c', found end of instruction)"),
481 CGEN_SYNTAX_CHAR(*syn));
482 return msg;
483 }
484 continue;
485 }
486
487 /* We have an operand of some sort. */
488 errmsg = cd->parse_operand (cd, CGEN_SYNTAX_FIELD (*syn),
489 &str, fields);
490 if (errmsg)
491 return errmsg;
492
493 /* Done with this operand, continue with next one. */
494 ++ syn;
495 }
496
497 /* If we're at the end of the syntax string, we're done. */
498 if (* syn == 0)
499 {
500 /* FIXME: For the moment we assume a valid `str' can only contain
501 blanks now. IE: We needn't try again with a longer version of
502 the insn and it is assumed that longer versions of insns appear
503 before shorter ones (eg: lsr r2,r3,1 vs lsr r2,r3). */
504 while (ISSPACE (* str))
505 ++ str;
506
507 if (* str != '\0')
508 return _("junk at end of line"); /* FIXME: would like to include `str' */
509
510 return NULL;
511 }
512
513 /* We couldn't parse it. */
514 return _("unrecognized instruction");
515 }
516
517 /* Main entry point.
518 This routine is called for each instruction to be assembled.
519 STR points to the insn to be assembled.
520 We assume all necessary tables have been initialized.
521 The assembled instruction, less any fixups, is stored in BUF.
522 Remember that if CGEN_INT_INSN_P then BUF is an int and thus the value
523 still needs to be converted to target byte order, otherwise BUF is an array
524 of bytes in target byte order.
525 The result is a pointer to the insn's entry in the opcode table,
526 or NULL if an error occured (an error message will have already been
527 printed).
528
529 Note that when processing (non-alias) macro-insns,
530 this function recurses.
531
532 ??? It's possible to make this cpu-independent.
533 One would have to deal with a few minor things.
534 At this point in time doing so would be more of a curiosity than useful
535 [for example this file isn't _that_ big], but keeping the possibility in
536 mind helps keep the design clean. */
537
538 const CGEN_INSN *
openrisc_cgen_assemble_insn(CGEN_CPU_DESC cd,const char * str,CGEN_FIELDS * fields,CGEN_INSN_BYTES_PTR buf,char ** errmsg)539 openrisc_cgen_assemble_insn (CGEN_CPU_DESC cd,
540 const char *str,
541 CGEN_FIELDS *fields,
542 CGEN_INSN_BYTES_PTR buf,
543 char **errmsg)
544 {
545 const char *start;
546 CGEN_INSN_LIST *ilist;
547 const char *parse_errmsg = NULL;
548 const char *insert_errmsg = NULL;
549 int recognized_mnemonic = 0;
550
551 /* Skip leading white space. */
552 while (ISSPACE (* str))
553 ++ str;
554
555 /* The instructions are stored in hashed lists.
556 Get the first in the list. */
557 ilist = CGEN_ASM_LOOKUP_INSN (cd, str);
558
559 /* Keep looking until we find a match. */
560 start = str;
561 for ( ; ilist != NULL ; ilist = CGEN_ASM_NEXT_INSN (ilist))
562 {
563 const CGEN_INSN *insn = ilist->insn;
564 recognized_mnemonic = 1;
565
566 #ifdef CGEN_VALIDATE_INSN_SUPPORTED
567 /* Not usually needed as unsupported opcodes
568 shouldn't be in the hash lists. */
569 /* Is this insn supported by the selected cpu? */
570 if (! openrisc_cgen_insn_supported (cd, insn))
571 continue;
572 #endif
573 /* If the RELAXED attribute is set, this is an insn that shouldn't be
574 chosen immediately. Instead, it is used during assembler/linker
575 relaxation if possible. */
576 if (CGEN_INSN_ATTR_VALUE (insn, CGEN_INSN_RELAXED) != 0)
577 continue;
578
579 str = start;
580
581 /* Skip this insn if str doesn't look right lexically. */
582 if (CGEN_INSN_RX (insn) != NULL &&
583 regexec ((regex_t *) CGEN_INSN_RX (insn), str, 0, NULL, 0) == REG_NOMATCH)
584 continue;
585
586 /* Allow parse/insert handlers to obtain length of insn. */
587 CGEN_FIELDS_BITSIZE (fields) = CGEN_INSN_BITSIZE (insn);
588
589 parse_errmsg = CGEN_PARSE_FN (cd, insn) (cd, insn, & str, fields);
590 if (parse_errmsg != NULL)
591 continue;
592
593 /* ??? 0 is passed for `pc'. */
594 insert_errmsg = CGEN_INSERT_FN (cd, insn) (cd, insn, fields, buf,
595 (bfd_vma) 0);
596 if (insert_errmsg != NULL)
597 continue;
598
599 /* It is up to the caller to actually output the insn and any
600 queued relocs. */
601 return insn;
602 }
603
604 {
605 static char errbuf[150];
606 #ifdef CGEN_VERBOSE_ASSEMBLER_ERRORS
607 const char *tmp_errmsg;
608
609 /* If requesting verbose error messages, use insert_errmsg.
610 Failing that, use parse_errmsg. */
611 tmp_errmsg = (insert_errmsg ? insert_errmsg :
612 parse_errmsg ? parse_errmsg :
613 recognized_mnemonic ?
614 _("unrecognized form of instruction") :
615 _("unrecognized instruction"));
616
617 if (strlen (start) > 50)
618 /* xgettext:c-format */
619 sprintf (errbuf, "%s `%.50s...'", tmp_errmsg, start);
620 else
621 /* xgettext:c-format */
622 sprintf (errbuf, "%s `%.50s'", tmp_errmsg, start);
623 #else
624 if (strlen (start) > 50)
625 /* xgettext:c-format */
626 sprintf (errbuf, _("bad instruction `%.50s...'"), start);
627 else
628 /* xgettext:c-format */
629 sprintf (errbuf, _("bad instruction `%.50s'"), start);
630 #endif
631
632 *errmsg = errbuf;
633 return NULL;
634 }
635 }
636