1 /* DO NOT EDIT! -*- buffer-read-only: t -*- vi:set ro: */
2 /* Assembler interface for targets using CGEN. -*- C -*-
3 CGEN: Cpu tools GENerator
4
5 THIS FILE IS MACHINE GENERATED WITH CGEN.
6 - the resultant file is machine generated, cgen-asm.in isn't
7
8 Copyright (C) 1996-2023 Free Software Foundation, Inc.
9
10 This file is part of libopcodes.
11
12 This library 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 3, or (at your option)
15 any later version.
16
17 It is distributed in the hope that it will be useful, but WITHOUT
18 ANY WARRANTY; without even the implied warranty of MERCHANTABILITY
19 or FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public
20 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
27 /* ??? Eventually more and more of this stuff can go to cpu-independent files.
28 Keep that in mind. */
29
30 #include "sysdep.h"
31 #include <stdio.h>
32 #include "ansidecl.h"
33 #include "bfd.h"
34 #include "symcat.h"
35 #include "epiphany-desc.h"
36 #include "epiphany-opc.h"
37 #include "opintl.h"
38 #include "xregex.h"
39 #include "libiberty.h"
40 #include "safe-ctype.h"
41
42 #undef min
43 #define min(a,b) ((a) < (b) ? (a) : (b))
44 #undef max
45 #define max(a,b) ((a) > (b) ? (a) : (b))
46
47 static const char * parse_insn_normal
48 (CGEN_CPU_DESC, const CGEN_INSN *, const char **, CGEN_FIELDS *);
49
50 /* -- assembler routines inserted here. */
51
52 /* -- asm.c */
53 const char *
54 parse_shortregs (CGEN_CPU_DESC cd,
55 const char ** strp,
56 CGEN_KEYWORD * keywords,
57 long * regno)
58 {
59 const char * errmsg;
60
61 /* Parse register. */
62 errmsg = cgen_parse_keyword (cd, strp, keywords, regno);
63
64 if (errmsg)
65 return errmsg;
66
67 if (*regno > 7)
68 errmsg = _("register unavailable for short instructions");
69
70 return errmsg;
71 }
72
73 static const char * parse_simm_not_reg (CGEN_CPU_DESC, const char **, int,
74 long *);
75
76 static const char *
77 parse_uimm_not_reg (CGEN_CPU_DESC cd,
78 const char ** strp,
79 int opindex,
80 unsigned long * valuep)
81 {
82 long * svalp = (void *) valuep;
83 return parse_simm_not_reg (cd, strp, opindex, svalp);
84 }
85
86 /* Handle simm3/simm11/imm3/imm12. */
87
88 static const char *
89 parse_simm_not_reg (CGEN_CPU_DESC cd,
90 const char ** strp,
91 int opindex,
92 long * valuep)
93 {
94 const char * errmsg;
95
96 int sign = 0;
97 int bits = 0;
98
99 switch (opindex)
100 {
101 case EPIPHANY_OPERAND_SIMM3:
102 sign = 1; bits = 3; break;
103 case EPIPHANY_OPERAND_SIMM11:
104 sign = 1; bits = 11; break;
105 case EPIPHANY_OPERAND_DISP3:
106 sign = 0; bits = 3; break;
107 case EPIPHANY_OPERAND_DISP11:
108 /* Load/store displacement is a sign-magnitude 12 bit value. */
109 sign = 0; bits = 11; break;
110 }
111
112 /* First try to parse as a register name and reject the operand. */
113 errmsg = cgen_parse_keyword (cd, strp, & epiphany_cgen_opval_gr_names,valuep);
114 if (!errmsg)
115 return _("register name used as immediate value");
116
117 errmsg = (sign ? cgen_parse_signed_integer (cd, strp, opindex, valuep)
118 : cgen_parse_unsigned_integer (cd, strp, opindex,
119 (unsigned long *) valuep));
120 if (errmsg)
121 return errmsg;
122
123 if (sign)
124 errmsg = cgen_validate_signed_integer (*valuep,
125 -((1L << bits) - 1), (1 << (bits - 1)) - 1);
126 else
127 errmsg = cgen_validate_unsigned_integer (*valuep, 0, (1L << bits) - 1);
128
129 return errmsg;
130 }
131
132 static const char *
133 parse_postindex (CGEN_CPU_DESC cd ATTRIBUTE_UNUSED,
134 const char ** strp,
135 int opindex ATTRIBUTE_UNUSED,
136 unsigned long *valuep)
137 {
138 if (**strp == '#')
139 ++*strp; /* Skip leading hashes. */
140
141 if (**strp == '-')
142 {
143 *valuep = 1;
144 ++*strp;
145 }
146 else if (**strp == '+')
147 {
148 *valuep = 0;
149 ++*strp;
150 }
151 else
152 *valuep = 0;
153
154 return NULL;
155 }
156
157 static const char *
158 parse_imm8 (CGEN_CPU_DESC cd,
159 const char ** strp,
160 int opindex,
161 bfd_reloc_code_real_type code,
162 enum cgen_parse_operand_result * result_type,
163 bfd_vma * valuep)
164 {
165 const char * errmsg;
166 enum cgen_parse_operand_result rt;
167 long dummyval;
168
169 if (!result_type)
170 result_type = &rt;
171
172 code = BFD_RELOC_NONE;
173
174 if (!cgen_parse_keyword (cd, strp, &epiphany_cgen_opval_gr_names, &dummyval)
175 || !cgen_parse_keyword (cd, strp, &epiphany_cgen_opval_cr_names,
176 &dummyval))
177 /* Don't treat "mov ip,ip" as a move-immediate. */
178 return _("register source in immediate move");
179
180 errmsg = cgen_parse_address (cd, strp, opindex, code, result_type, valuep);
181 if (errmsg)
182 return errmsg;
183
184 if (*result_type == CGEN_PARSE_OPERAND_RESULT_NUMBER)
185 errmsg = cgen_validate_unsigned_integer (*valuep, 0, 0xff);
186 else
187 errmsg = _("byte relocation unsupported");
188
189 *valuep &= 0xff;
190 return errmsg;
191 }
192
193 static const char * MISSING_CLOSE_PARENTHESIS = N_("missing `)'");
194
195 static const char *
196 parse_imm16 (CGEN_CPU_DESC cd,
197 const char ** strp,
198 int opindex,
199 bfd_reloc_code_real_type code ATTRIBUTE_UNUSED,
200 enum cgen_parse_operand_result * result_type,
201 bfd_vma * valuep)
202 {
203 const char * errmsg;
204 enum cgen_parse_operand_result rt;
205 long dummyval;
206
207 if (!result_type)
208 result_type = &rt;
209
210 if (strncasecmp (*strp, "%high(", 6) == 0)
211 {
212 *strp += 6;
213 errmsg = cgen_parse_address (cd, strp, opindex, BFD_RELOC_EPIPHANY_HIGH,
214 result_type, valuep);
215 if (**strp != ')')
216 return MISSING_CLOSE_PARENTHESIS;
217 ++*strp;
218 *valuep >>= 16;
219 }
220 else if (strncasecmp (*strp, "%low(", 5) == 0)
221 {
222 *strp += 5;
223 errmsg = cgen_parse_address (cd, strp, opindex, BFD_RELOC_EPIPHANY_LOW,
224 result_type, valuep);
225 if (**strp != ')')
226 return MISSING_CLOSE_PARENTHESIS;
227 ++*strp;
228 }
229 else if (!cgen_parse_keyword (cd, strp, &epiphany_cgen_opval_gr_names,
230 &dummyval)
231 || !cgen_parse_keyword (cd, strp, &epiphany_cgen_opval_cr_names,
232 &dummyval))
233 /* Don't treat "mov ip,ip" as a move-immediate. */
234 return _("register source in immediate move");
235 else
236 errmsg = cgen_parse_address (cd, strp, opindex, BFD_RELOC_16,
237 result_type, valuep);
238
239 if (!errmsg && result_type == CGEN_PARSE_OPERAND_RESULT_NUMBER)
240 errmsg = cgen_validate_unsigned_integer (*valuep, 0, 0xffff);
241
242 *valuep &= 0xffff;
243 return errmsg;
244 }
245
246 const char *
247 parse_branch_addr (CGEN_CPU_DESC cd,
248 const char ** strp,
249 int opindex,
250 int opinfo ATTRIBUTE_UNUSED,
251 enum cgen_parse_operand_result * resultp ATTRIBUTE_UNUSED,
252 bfd_vma *valuep ATTRIBUTE_UNUSED)
253 {
254 const char * errmsg;
255 enum cgen_parse_operand_result result_type;
256 bfd_reloc_code_real_type code = BFD_RELOC_NONE;
257 bfd_vma value;
258
259 switch (opindex)
260 {
261 case EPIPHANY_OPERAND_SIMM24:
262 code = BFD_RELOC_EPIPHANY_SIMM24;
263 break;
264
265 case EPIPHANY_OPERAND_SIMM8:
266 code = BFD_RELOC_EPIPHANY_SIMM8;
267 break;
268
269 default:
270 errmsg = _("ABORT: unknown operand");
271 return errmsg;
272 }
273
274 errmsg = cgen_parse_address (cd, strp, opindex, code,
275 &result_type, &value);
276 if (errmsg == NULL)
277 {
278 if (result_type == CGEN_PARSE_OPERAND_RESULT_NUMBER)
279 {
280 /* Act as if we had done a PC-relative branch, ala .+num. */
281 char buf[20];
282 const char * bufp = (const char *) buf;
283
284 sprintf (buf, ".+%ld", (long) value);
285 errmsg = cgen_parse_address (cd, &bufp, opindex, code, &result_type,
286 &value);
287 }
288
289 if (result_type == CGEN_PARSE_OPERAND_RESULT_QUEUED)
290 {
291 /* This will happen for things like (s2-s1) where s2 and s1
292 are labels. */
293 /* Nothing further to be done. */
294 }
295 else
296 errmsg = _("Not a pc-relative address.");
297 }
298 return errmsg;
299 }
300
301 /* -- dis.c */
302
303 const char * epiphany_cgen_parse_operand
304 (CGEN_CPU_DESC, int, const char **, CGEN_FIELDS *);
305
306 /* Main entry point for operand parsing.
307
308 This function is basically just a big switch statement. Earlier versions
309 used tables to look up the function to use, but
310 - if the table contains both assembler and disassembler functions then
311 the disassembler contains much of the assembler and vice-versa,
312 - there's a lot of inlining possibilities as things grow,
313 - using a switch statement avoids the function call overhead.
314
315 This function could be moved into `parse_insn_normal', but keeping it
316 separate makes clear the interface between `parse_insn_normal' and each of
317 the handlers. */
318
319 const char *
320 epiphany_cgen_parse_operand (CGEN_CPU_DESC cd,
321 int opindex,
322 const char ** strp,
323 CGEN_FIELDS * fields)
324 {
325 const char * errmsg = NULL;
326 /* Used by scalar operands that still need to be parsed. */
327 long junk ATTRIBUTE_UNUSED;
328
329 switch (opindex)
330 {
331 case EPIPHANY_OPERAND_DIRECTION :
332 errmsg = parse_postindex (cd, strp, EPIPHANY_OPERAND_DIRECTION, (unsigned long *) (& fields->f_addsubx));
333 break;
334 case EPIPHANY_OPERAND_DISP11 :
335 errmsg = parse_uimm_not_reg (cd, strp, EPIPHANY_OPERAND_DISP11, (unsigned long *) (& fields->f_disp11));
336 break;
337 case EPIPHANY_OPERAND_DISP3 :
338 errmsg = cgen_parse_unsigned_integer (cd, strp, EPIPHANY_OPERAND_DISP3, (unsigned long *) (& fields->f_disp3));
339 break;
340 case EPIPHANY_OPERAND_DPMI :
341 errmsg = parse_postindex (cd, strp, EPIPHANY_OPERAND_DPMI, (unsigned long *) (& fields->f_subd));
342 break;
343 case EPIPHANY_OPERAND_FRD :
344 errmsg = parse_shortregs (cd, strp, & epiphany_cgen_opval_gr_names, & fields->f_rd);
345 break;
346 case EPIPHANY_OPERAND_FRD6 :
347 errmsg = cgen_parse_keyword (cd, strp, & epiphany_cgen_opval_gr_names, & fields->f_rd6);
348 break;
349 case EPIPHANY_OPERAND_FRM :
350 errmsg = parse_shortregs (cd, strp, & epiphany_cgen_opval_gr_names, & fields->f_rm);
351 break;
352 case EPIPHANY_OPERAND_FRM6 :
353 errmsg = cgen_parse_keyword (cd, strp, & epiphany_cgen_opval_gr_names, & fields->f_rm6);
354 break;
355 case EPIPHANY_OPERAND_FRN :
356 errmsg = parse_shortregs (cd, strp, & epiphany_cgen_opval_gr_names, & fields->f_rn);
357 break;
358 case EPIPHANY_OPERAND_FRN6 :
359 errmsg = cgen_parse_keyword (cd, strp, & epiphany_cgen_opval_gr_names, & fields->f_rn6);
360 break;
361 case EPIPHANY_OPERAND_IMM16 :
362 {
363 bfd_vma value = 0;
364 errmsg = parse_imm16 (cd, strp, EPIPHANY_OPERAND_IMM16, 0, NULL, & value);
365 fields->f_imm16 = value;
366 }
367 break;
368 case EPIPHANY_OPERAND_IMM8 :
369 {
370 bfd_vma value = 0;
371 errmsg = parse_imm8 (cd, strp, EPIPHANY_OPERAND_IMM8, 0, NULL, & value);
372 fields->f_imm8 = value;
373 }
374 break;
375 case EPIPHANY_OPERAND_RD :
376 errmsg = parse_shortregs (cd, strp, & epiphany_cgen_opval_gr_names, & fields->f_rd);
377 break;
378 case EPIPHANY_OPERAND_RD6 :
379 errmsg = cgen_parse_keyword (cd, strp, & epiphany_cgen_opval_gr_names, & fields->f_rd6);
380 break;
381 case EPIPHANY_OPERAND_RM :
382 errmsg = parse_shortregs (cd, strp, & epiphany_cgen_opval_gr_names, & fields->f_rm);
383 break;
384 case EPIPHANY_OPERAND_RM6 :
385 errmsg = cgen_parse_keyword (cd, strp, & epiphany_cgen_opval_gr_names, & fields->f_rm6);
386 break;
387 case EPIPHANY_OPERAND_RN :
388 errmsg = parse_shortregs (cd, strp, & epiphany_cgen_opval_gr_names, & fields->f_rn);
389 break;
390 case EPIPHANY_OPERAND_RN6 :
391 errmsg = cgen_parse_keyword (cd, strp, & epiphany_cgen_opval_gr_names, & fields->f_rn6);
392 break;
393 case EPIPHANY_OPERAND_SD :
394 errmsg = parse_shortregs (cd, strp, & epiphany_cgen_opval_cr_names, & fields->f_sd);
395 break;
396 case EPIPHANY_OPERAND_SD6 :
397 errmsg = cgen_parse_keyword (cd, strp, & epiphany_cgen_opval_cr_names, & fields->f_sd6);
398 break;
399 case EPIPHANY_OPERAND_SDDMA :
400 errmsg = cgen_parse_keyword (cd, strp, & epiphany_cgen_opval_crdma_names, & fields->f_sd6);
401 break;
402 case EPIPHANY_OPERAND_SDMEM :
403 errmsg = cgen_parse_keyword (cd, strp, & epiphany_cgen_opval_crmem_names, & fields->f_sd6);
404 break;
405 case EPIPHANY_OPERAND_SDMESH :
406 errmsg = cgen_parse_keyword (cd, strp, & epiphany_cgen_opval_crmesh_names, & fields->f_sd6);
407 break;
408 case EPIPHANY_OPERAND_SHIFT :
409 errmsg = cgen_parse_unsigned_integer (cd, strp, EPIPHANY_OPERAND_SHIFT, (unsigned long *) (& fields->f_shift));
410 break;
411 case EPIPHANY_OPERAND_SIMM11 :
412 errmsg = parse_simm_not_reg (cd, strp, EPIPHANY_OPERAND_SIMM11, (long *) (& fields->f_sdisp11));
413 break;
414 case EPIPHANY_OPERAND_SIMM24 :
415 {
416 bfd_vma value = 0;
417 errmsg = parse_branch_addr (cd, strp, EPIPHANY_OPERAND_SIMM24, 0, NULL, & value);
418 fields->f_simm24 = value;
419 }
420 break;
421 case EPIPHANY_OPERAND_SIMM3 :
422 errmsg = parse_simm_not_reg (cd, strp, EPIPHANY_OPERAND_SIMM3, (long *) (& fields->f_sdisp3));
423 break;
424 case EPIPHANY_OPERAND_SIMM8 :
425 {
426 bfd_vma value = 0;
427 errmsg = parse_branch_addr (cd, strp, EPIPHANY_OPERAND_SIMM8, 0, NULL, & value);
428 fields->f_simm8 = value;
429 }
430 break;
431 case EPIPHANY_OPERAND_SN :
432 errmsg = parse_shortregs (cd, strp, & epiphany_cgen_opval_cr_names, & fields->f_sn);
433 break;
434 case EPIPHANY_OPERAND_SN6 :
435 errmsg = cgen_parse_keyword (cd, strp, & epiphany_cgen_opval_cr_names, & fields->f_sn6);
436 break;
437 case EPIPHANY_OPERAND_SNDMA :
438 errmsg = cgen_parse_keyword (cd, strp, & epiphany_cgen_opval_crdma_names, & fields->f_sn6);
439 break;
440 case EPIPHANY_OPERAND_SNMEM :
441 errmsg = cgen_parse_keyword (cd, strp, & epiphany_cgen_opval_crmem_names, & fields->f_sn6);
442 break;
443 case EPIPHANY_OPERAND_SNMESH :
444 errmsg = cgen_parse_keyword (cd, strp, & epiphany_cgen_opval_crmesh_names, & fields->f_sn6);
445 break;
446 case EPIPHANY_OPERAND_SWI_NUM :
447 errmsg = parse_uimm_not_reg (cd, strp, EPIPHANY_OPERAND_SWI_NUM, (unsigned long *) (& fields->f_trap_num));
448 break;
449 case EPIPHANY_OPERAND_TRAPNUM6 :
450 errmsg = cgen_parse_unsigned_integer (cd, strp, EPIPHANY_OPERAND_TRAPNUM6, (unsigned long *) (& fields->f_trap_num));
451 break;
452
453 default :
454 /* xgettext:c-format */
455 opcodes_error_handler
456 (_("internal error: unrecognized field %d while parsing"),
457 opindex);
458 abort ();
459 }
460
461 return errmsg;
462 }
463
464 cgen_parse_fn * const epiphany_cgen_parse_handlers[] =
465 {
466 parse_insn_normal,
467 };
468
469 void
470 epiphany_cgen_init_asm (CGEN_CPU_DESC cd)
471 {
472 epiphany_cgen_init_opcode_table (cd);
473 epiphany_cgen_init_ibld_table (cd);
474 cd->parse_handlers = & epiphany_cgen_parse_handlers[0];
475 cd->parse_operand = epiphany_cgen_parse_operand;
476 #ifdef CGEN_ASM_INIT_HOOK
477 CGEN_ASM_INIT_HOOK
478 #endif
479 }
480
481
482
483 /* Regex construction routine.
484
485 This translates an opcode syntax string into a regex string,
486 by replacing any non-character syntax element (such as an
487 opcode) with the pattern '.*'
488
489 It then compiles the regex and stores it in the opcode, for
490 later use by epiphany_cgen_assemble_insn
491
492 Returns NULL for success, an error message for failure. */
493
494 char *
495 epiphany_cgen_build_insn_regex (CGEN_INSN *insn)
496 {
497 CGEN_OPCODE *opc = (CGEN_OPCODE *) CGEN_INSN_OPCODE (insn);
498 const char *mnem = CGEN_INSN_MNEMONIC (insn);
499 char rxbuf[CGEN_MAX_RX_ELEMENTS];
500 char *rx = rxbuf;
501 const CGEN_SYNTAX_CHAR_TYPE *syn;
502 int reg_err;
503
504 syn = CGEN_SYNTAX_STRING (CGEN_OPCODE_SYNTAX (opc));
505
506 /* Mnemonics come first in the syntax string. */
507 if (! CGEN_SYNTAX_MNEMONIC_P (* syn))
508 return _("missing mnemonic in syntax string");
509 ++syn;
510
511 /* Generate a case sensitive regular expression that emulates case
512 insensitive matching in the "C" locale. We cannot generate a case
513 insensitive regular expression because in Turkish locales, 'i' and 'I'
514 are not equal modulo case conversion. */
515
516 /* Copy the literal mnemonic out of the insn. */
517 for (; *mnem; mnem++)
518 {
519 char c = *mnem;
520
521 if (ISALPHA (c))
522 {
523 *rx++ = '[';
524 *rx++ = TOLOWER (c);
525 *rx++ = TOUPPER (c);
526 *rx++ = ']';
527 }
528 else
529 *rx++ = c;
530 }
531
532 /* Copy any remaining literals from the syntax string into the rx. */
533 for(; * syn != 0 && rx <= rxbuf + (CGEN_MAX_RX_ELEMENTS - 7 - 4); ++syn)
534 {
535 if (CGEN_SYNTAX_CHAR_P (* syn))
536 {
537 char c = CGEN_SYNTAX_CHAR (* syn);
538
539 switch (c)
540 {
541 /* Escape any regex metacharacters in the syntax. */
542 case '.': case '[': case '\\':
543 case '*': case '^': case '$':
544
545 #ifdef CGEN_ESCAPE_EXTENDED_REGEX
546 case '?': case '{': case '}':
547 case '(': case ')': case '*':
548 case '|': case '+': case ']':
549 #endif
550 *rx++ = '\\';
551 *rx++ = c;
552 break;
553
554 default:
555 if (ISALPHA (c))
556 {
557 *rx++ = '[';
558 *rx++ = TOLOWER (c);
559 *rx++ = TOUPPER (c);
560 *rx++ = ']';
561 }
562 else
563 *rx++ = c;
564 break;
565 }
566 }
567 else
568 {
569 /* Replace non-syntax fields with globs. */
570 *rx++ = '.';
571 *rx++ = '*';
572 }
573 }
574
575 /* Trailing whitespace ok. */
576 * rx++ = '[';
577 * rx++ = ' ';
578 * rx++ = '\t';
579 * rx++ = ']';
580 * rx++ = '*';
581
582 /* But anchor it after that. */
583 * rx++ = '$';
584 * rx = '\0';
585
586 CGEN_INSN_RX (insn) = xmalloc (sizeof (regex_t));
587 reg_err = regcomp ((regex_t *) CGEN_INSN_RX (insn), rxbuf, REG_NOSUB);
588
589 if (reg_err == 0)
590 return NULL;
591 else
592 {
593 static char msg[80];
594
595 regerror (reg_err, (regex_t *) CGEN_INSN_RX (insn), msg, 80);
596 regfree ((regex_t *) CGEN_INSN_RX (insn));
597 free (CGEN_INSN_RX (insn));
598 (CGEN_INSN_RX (insn)) = NULL;
599 return msg;
600 }
601 }
602
603
604 /* Default insn parser.
605
606 The syntax string is scanned and operands are parsed and stored in FIELDS.
607 Relocs are queued as we go via other callbacks.
608
609 ??? Note that this is currently an all-or-nothing parser. If we fail to
610 parse the instruction, we return 0 and the caller will start over from
611 the beginning. Backtracking will be necessary in parsing subexpressions,
612 but that can be handled there. Not handling backtracking here may get
613 expensive in the case of the m68k. Deal with later.
614
615 Returns NULL for success, an error message for failure. */
616
617 static const char *
618 parse_insn_normal (CGEN_CPU_DESC cd,
619 const CGEN_INSN *insn,
620 const char **strp,
621 CGEN_FIELDS *fields)
622 {
623 /* ??? Runtime added insns not handled yet. */
624 const CGEN_SYNTAX *syntax = CGEN_INSN_SYNTAX (insn);
625 const char *str = *strp;
626 const char *errmsg;
627 const char *p;
628 const CGEN_SYNTAX_CHAR_TYPE * syn;
629 #ifdef CGEN_MNEMONIC_OPERANDS
630 /* FIXME: wip */
631 int past_opcode_p;
632 #endif
633
634 /* For now we assume the mnemonic is first (there are no leading operands).
635 We can parse it without needing to set up operand parsing.
636 GAS's input scrubber will ensure mnemonics are lowercase, but we may
637 not be called from GAS. */
638 p = CGEN_INSN_MNEMONIC (insn);
639 while (*p && TOLOWER (*p) == TOLOWER (*str))
640 ++p, ++str;
641
642 if (* p)
643 return _("unrecognized instruction");
644
645 #ifndef CGEN_MNEMONIC_OPERANDS
646 if (* str && ! ISSPACE (* str))
647 return _("unrecognized instruction");
648 #endif
649
650 CGEN_INIT_PARSE (cd);
651 cgen_init_parse_operand (cd);
652 #ifdef CGEN_MNEMONIC_OPERANDS
653 past_opcode_p = 0;
654 #endif
655
656 /* We don't check for (*str != '\0') here because we want to parse
657 any trailing fake arguments in the syntax string. */
658 syn = CGEN_SYNTAX_STRING (syntax);
659
660 /* Mnemonics come first for now, ensure valid string. */
661 if (! CGEN_SYNTAX_MNEMONIC_P (* syn))
662 abort ();
663
664 ++syn;
665
666 while (* syn != 0)
667 {
668 /* Non operand chars must match exactly. */
669 if (CGEN_SYNTAX_CHAR_P (* syn))
670 {
671 /* FIXME: While we allow for non-GAS callers above, we assume the
672 first char after the mnemonic part is a space. */
673 /* FIXME: We also take inappropriate advantage of the fact that
674 GAS's input scrubber will remove extraneous blanks. */
675 if (TOLOWER (*str) == TOLOWER (CGEN_SYNTAX_CHAR (* syn)))
676 {
677 #ifdef CGEN_MNEMONIC_OPERANDS
678 if (CGEN_SYNTAX_CHAR(* syn) == ' ')
679 past_opcode_p = 1;
680 #endif
681 ++ syn;
682 ++ str;
683 }
684 else if (*str)
685 {
686 /* Syntax char didn't match. Can't be this insn. */
687 static char msg [80];
688
689 /* xgettext:c-format */
690 sprintf (msg, _("syntax error (expected char `%c', found `%c')"),
691 CGEN_SYNTAX_CHAR(*syn), *str);
692 return msg;
693 }
694 else
695 {
696 /* Ran out of input. */
697 static char msg [80];
698
699 /* xgettext:c-format */
700 sprintf (msg, _("syntax error (expected char `%c', found end of instruction)"),
701 CGEN_SYNTAX_CHAR(*syn));
702 return msg;
703 }
704 continue;
705 }
706
707 #ifdef CGEN_MNEMONIC_OPERANDS
708 (void) past_opcode_p;
709 #endif
710 /* We have an operand of some sort. */
711 errmsg = cd->parse_operand (cd, CGEN_SYNTAX_FIELD (*syn), &str, fields);
712 if (errmsg)
713 return errmsg;
714
715 /* Done with this operand, continue with next one. */
716 ++ syn;
717 }
718
719 /* If we're at the end of the syntax string, we're done. */
720 if (* syn == 0)
721 {
722 /* FIXME: For the moment we assume a valid `str' can only contain
723 blanks now. IE: We needn't try again with a longer version of
724 the insn and it is assumed that longer versions of insns appear
725 before shorter ones (eg: lsr r2,r3,1 vs lsr r2,r3). */
726 while (ISSPACE (* str))
727 ++ str;
728
729 if (* str != '\0')
730 return _("junk at end of line"); /* FIXME: would like to include `str' */
731
732 return NULL;
733 }
734
735 /* We couldn't parse it. */
736 return _("unrecognized instruction");
737 }
738
739 /* Main entry point.
740 This routine is called for each instruction to be assembled.
741 STR points to the insn to be assembled.
742 We assume all necessary tables have been initialized.
743 The assembled instruction, less any fixups, is stored in BUF.
744 Remember that if CGEN_INT_INSN_P then BUF is an int and thus the value
745 still needs to be converted to target byte order, otherwise BUF is an array
746 of bytes in target byte order.
747 The result is a pointer to the insn's entry in the opcode table,
748 or NULL if an error occured (an error message will have already been
749 printed).
750
751 Note that when processing (non-alias) macro-insns,
752 this function recurses.
753
754 ??? It's possible to make this cpu-independent.
755 One would have to deal with a few minor things.
756 At this point in time doing so would be more of a curiosity than useful
757 [for example this file isn't _that_ big], but keeping the possibility in
758 mind helps keep the design clean. */
759
760 const CGEN_INSN *
761 epiphany_cgen_assemble_insn (CGEN_CPU_DESC cd,
762 const char *str,
763 CGEN_FIELDS *fields,
764 CGEN_INSN_BYTES_PTR buf,
765 char **errmsg)
766 {
767 const char *start;
768 CGEN_INSN_LIST *ilist;
769 const char *parse_errmsg = NULL;
770 const char *insert_errmsg = NULL;
771 int recognized_mnemonic = 0;
772
773 /* Skip leading white space. */
774 while (ISSPACE (* str))
775 ++ str;
776
777 /* The instructions are stored in hashed lists.
778 Get the first in the list. */
779 ilist = CGEN_ASM_LOOKUP_INSN (cd, str);
780
781 /* Keep looking until we find a match. */
782 start = str;
783 for ( ; ilist != NULL ; ilist = CGEN_ASM_NEXT_INSN (ilist))
784 {
785 const CGEN_INSN *insn = ilist->insn;
786 recognized_mnemonic = 1;
787
788 #ifdef CGEN_VALIDATE_INSN_SUPPORTED
789 /* Not usually needed as unsupported opcodes
790 shouldn't be in the hash lists. */
791 /* Is this insn supported by the selected cpu? */
792 if (! epiphany_cgen_insn_supported (cd, insn))
793 continue;
794 #endif
795 /* If the RELAXED attribute is set, this is an insn that shouldn't be
796 chosen immediately. Instead, it is used during assembler/linker
797 relaxation if possible. */
798 if (CGEN_INSN_ATTR_VALUE (insn, CGEN_INSN_RELAXED) != 0)
799 continue;
800
801 str = start;
802
803 /* Skip this insn if str doesn't look right lexically. */
804 if (CGEN_INSN_RX (insn) != NULL &&
805 regexec ((regex_t *) CGEN_INSN_RX (insn), str, 0, NULL, 0) == REG_NOMATCH)
806 continue;
807
808 /* Allow parse/insert handlers to obtain length of insn. */
809 CGEN_FIELDS_BITSIZE (fields) = CGEN_INSN_BITSIZE (insn);
810
811 parse_errmsg = CGEN_PARSE_FN (cd, insn) (cd, insn, & str, fields);
812 if (parse_errmsg != NULL)
813 continue;
814
815 /* ??? 0 is passed for `pc'. */
816 insert_errmsg = CGEN_INSERT_FN (cd, insn) (cd, insn, fields, buf,
817 (bfd_vma) 0);
818 if (insert_errmsg != NULL)
819 continue;
820
821 /* It is up to the caller to actually output the insn and any
822 queued relocs. */
823 return insn;
824 }
825
826 {
827 static char errbuf[150];
828 const char *tmp_errmsg;
829 #ifdef CGEN_VERBOSE_ASSEMBLER_ERRORS
830 #define be_verbose 1
831 #else
832 #define be_verbose 0
833 #endif
834
835 if (be_verbose)
836 {
837 /* If requesting verbose error messages, use insert_errmsg.
838 Failing that, use parse_errmsg. */
839 tmp_errmsg = (insert_errmsg ? insert_errmsg :
840 parse_errmsg ? parse_errmsg :
841 recognized_mnemonic ?
842 _("unrecognized form of instruction") :
843 _("unrecognized instruction"));
844
845 if (strlen (start) > 50)
846 /* xgettext:c-format */
847 sprintf (errbuf, "%s `%.50s...'", tmp_errmsg, start);
848 else
849 /* xgettext:c-format */
850 sprintf (errbuf, "%s `%.50s'", tmp_errmsg, start);
851 }
852 else
853 {
854 if (strlen (start) > 50)
855 /* xgettext:c-format */
856 sprintf (errbuf, _("bad instruction `%.50s...'"), start);
857 else
858 /* xgettext:c-format */
859 sprintf (errbuf, _("bad instruction `%.50s'"), start);
860 }
861
862 *errmsg = errbuf;
863 return NULL;
864 }
865 }