1 /* Assembler interface for targets using CGEN. -*- C -*-
2 CGEN: Cpu tools GENerator
4 THIS FILE IS MACHINE GENERATED WITH CGEN.
5 - the resultant file is machine generated, cgen-asm.in isn't
7 Copyright 1996, 1997, 1998, 1999, 2000, 2001 Free Software Foundation, Inc.
9 This file is part of the GNU Binutils and GDB, the GNU debugger.
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)
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.
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. */
25 /* ??? Eventually more and more of this stuff can go to cpu-independent files.
33 #include "openrisc-desc.h"
34 #include "openrisc-opc.h"
37 #include "libiberty.h"
38 #include "safe-ctype.h"
41 #define min(a,b) ((a) < (b) ? (a) : (b))
43 #define max(a,b) ((a) > (b) ? (a) : (b))
45 static const char * parse_insn_normal
46 PARAMS ((CGEN_CPU_DESC, const CGEN_INSN *, const char **, CGEN_FIELDS *));
48 /* -- assembler routines inserted here. */
52 #define CGEN_VERBOSE_ASSEMBLER_ERRORS
54 static const char * parse_hi16
55 PARAMS ((CGEN_CPU_DESC, const char **, int, unsigned long *));
56 static const char * parse_lo16
57 PARAMS ((CGEN_CPU_DESC, const char **, int, unsigned long *));
60 openrisc_sign_extend_16bit (value)
63 return (long) (short) value;
69 parse_hi16 (cd, strp, opindex, valuep)
73 unsigned long *valuep;
76 enum cgen_parse_operand_result result_type;
82 if (strncasecmp (*strp, "hi(", 3) == 0)
87 errmsg = cgen_parse_signed_integer (cd, strp, opindex, valuep);
89 fprintf (stderr, "parse_hi: %s\n", errmsg);
92 errmsg = cgen_parse_address (cd, strp, opindex, BFD_RELOC_HI16,
93 &result_type, &value);
98 && result_type == CGEN_PARSE_OPERAND_RESULT_NUMBER)
100 *valuep = (long) (short) value;
107 errmsg = cgen_parse_signed_integer (cd, strp, opindex, (long *) &value);
109 errmsg = cgen_parse_unsigned_integer (cd, strp, opindex, (unsigned long *) &value);
111 *valuep = (long) (short) (value & 0xffff);
118 parse_lo16 (cd, strp, opindex, valuep)
122 unsigned long *valuep;
125 enum cgen_parse_operand_result result_type;
131 if (strncasecmp (*strp, "lo(", 3) == 0)
136 errmsg = cgen_parse_signed_integer (cd, strp, opindex, valuep);
138 fprintf (stderr, "parse_lo: %s\n", errmsg);
142 errmsg = cgen_parse_address (cd, strp, opindex, BFD_RELOC_LO16,
143 &result_type, &value);
145 return "missing `)'";
148 && result_type == CGEN_PARSE_OPERAND_RESULT_NUMBER)
150 *valuep = (long) (short) value;
156 errmsg = cgen_parse_signed_integer (cd, strp, opindex, (long *) &value);
158 errmsg = cgen_parse_unsigned_integer (cd, strp, opindex, (unsigned long *) &value);
159 *valuep = (long) (short) (value & 0xffff);
165 const char * openrisc_cgen_parse_operand
166 PARAMS ((CGEN_CPU_DESC, int, const char **, CGEN_FIELDS *));
168 /* Main entry point for operand parsing.
170 This function is basically just a big switch statement. Earlier versions
171 used tables to look up the function to use, but
172 - if the table contains both assembler and disassembler functions then
173 the disassembler contains much of the assembler and vice-versa,
174 - there's a lot of inlining possibilities as things grow,
175 - using a switch statement avoids the function call overhead.
177 This function could be moved into `parse_insn_normal', but keeping it
178 separate makes clear the interface between `parse_insn_normal' and each of
183 openrisc_cgen_parse_operand (cd, opindex, strp, fields)
187 CGEN_FIELDS * fields;
189 const char * errmsg = NULL;
190 /* Used by scalar operands that still need to be parsed. */
191 long junk ATTRIBUTE_UNUSED;
195 case OPENRISC_OPERAND_ABS_26 :
198 errmsg = cgen_parse_address (cd, strp, OPENRISC_OPERAND_ABS_26, 0, NULL, & value);
199 fields->f_abs26 = value;
202 case OPENRISC_OPERAND_DISP_26 :
205 errmsg = cgen_parse_address (cd, strp, OPENRISC_OPERAND_DISP_26, 0, NULL, & value);
206 fields->f_disp26 = value;
209 case OPENRISC_OPERAND_HI16 :
210 errmsg = parse_hi16 (cd, strp, OPENRISC_OPERAND_HI16, &fields->f_simm16);
212 case OPENRISC_OPERAND_LO16 :
213 errmsg = parse_lo16 (cd, strp, OPENRISC_OPERAND_LO16, &fields->f_lo16);
215 case OPENRISC_OPERAND_OP_F_23 :
216 errmsg = cgen_parse_unsigned_integer (cd, strp, OPENRISC_OPERAND_OP_F_23, &fields->f_op4);
218 case OPENRISC_OPERAND_OP_F_3 :
219 errmsg = cgen_parse_unsigned_integer (cd, strp, OPENRISC_OPERAND_OP_F_3, &fields->f_op5);
221 case OPENRISC_OPERAND_RA :
222 errmsg = cgen_parse_keyword (cd, strp, & openrisc_cgen_opval_h_gr, & fields->f_r2);
224 case OPENRISC_OPERAND_RB :
225 errmsg = cgen_parse_keyword (cd, strp, & openrisc_cgen_opval_h_gr, & fields->f_r3);
227 case OPENRISC_OPERAND_RD :
228 errmsg = cgen_parse_keyword (cd, strp, & openrisc_cgen_opval_h_gr, & fields->f_r1);
230 case OPENRISC_OPERAND_SIMM_16 :
231 errmsg = cgen_parse_signed_integer (cd, strp, OPENRISC_OPERAND_SIMM_16, &fields->f_simm16);
233 case OPENRISC_OPERAND_UI16NC :
234 errmsg = parse_lo16 (cd, strp, OPENRISC_OPERAND_UI16NC, &fields->f_i16nc);
236 case OPENRISC_OPERAND_UIMM_16 :
237 errmsg = cgen_parse_unsigned_integer (cd, strp, OPENRISC_OPERAND_UIMM_16, &fields->f_uimm16);
239 case OPENRISC_OPERAND_UIMM_5 :
240 errmsg = cgen_parse_unsigned_integer (cd, strp, OPENRISC_OPERAND_UIMM_5, &fields->f_uimm5);
244 /* xgettext:c-format */
245 fprintf (stderr, _("Unrecognized field %d while parsing.\n"), opindex);
252 cgen_parse_fn * const openrisc_cgen_parse_handlers[] =
258 openrisc_cgen_init_asm (cd)
261 openrisc_cgen_init_opcode_table (cd);
262 openrisc_cgen_init_ibld_table (cd);
263 cd->parse_handlers = & openrisc_cgen_parse_handlers[0];
264 cd->parse_operand = openrisc_cgen_parse_operand;
269 /* Regex construction routine.
271 This translates an opcode syntax string into a regex string,
272 by replacing any non-character syntax element (such as an
273 opcode) with the pattern '.*'
275 It then compiles the regex and stores it in the opcode, for
276 later use by openrisc_cgen_assemble_insn
278 Returns NULL for success, an error message for failure. */
281 openrisc_cgen_build_insn_regex (insn)
284 CGEN_OPCODE *opc = (CGEN_OPCODE *) CGEN_INSN_OPCODE (insn);
285 const char *mnem = CGEN_INSN_MNEMONIC (insn);
286 char rxbuf[CGEN_MAX_RX_ELEMENTS];
288 const CGEN_SYNTAX_CHAR_TYPE *syn;
291 syn = CGEN_SYNTAX_STRING (CGEN_OPCODE_SYNTAX (opc));
293 /* Mnemonics come first in the syntax string. */
294 if (! CGEN_SYNTAX_MNEMONIC_P (* syn))
295 return _("missing mnemonic in syntax string");
298 /* Generate a case sensitive regular expression that emulates case
299 insensitive matching in the "C" locale. We cannot generate a case
300 insensitive regular expression because in Turkish locales, 'i' and 'I'
301 are not equal modulo case conversion. */
303 /* Copy the literal mnemonic out of the insn. */
304 for (; *mnem; mnem++)
319 /* Copy any remaining literals from the syntax string into the rx. */
320 for(; * syn != 0 && rx <= rxbuf + (CGEN_MAX_RX_ELEMENTS - 7 - 4); ++syn)
322 if (CGEN_SYNTAX_CHAR_P (* syn))
324 char c = CGEN_SYNTAX_CHAR (* syn);
328 /* Escape any regex metacharacters in the syntax. */
329 case '.': case '[': case '\\':
330 case '*': case '^': case '$':
332 #ifdef CGEN_ESCAPE_EXTENDED_REGEX
333 case '?': case '{': case '}':
334 case '(': case ')': case '*':
335 case '|': case '+': case ']':
356 /* Replace non-syntax fields with globs. */
362 /* Trailing whitespace ok. */
369 /* But anchor it after that. */
373 CGEN_INSN_RX (insn) = xmalloc (sizeof (regex_t));
374 reg_err = regcomp ((regex_t *) CGEN_INSN_RX (insn), rxbuf, REG_NOSUB);
382 regerror (reg_err, (regex_t *) CGEN_INSN_RX (insn), msg, 80);
383 regfree ((regex_t *) CGEN_INSN_RX (insn));
384 free (CGEN_INSN_RX (insn));
385 (CGEN_INSN_RX (insn)) = NULL;
391 /* Default insn parser.
393 The syntax string is scanned and operands are parsed and stored in FIELDS.
394 Relocs are queued as we go via other callbacks.
396 ??? Note that this is currently an all-or-nothing parser. If we fail to
397 parse the instruction, we return 0 and the caller will start over from
398 the beginning. Backtracking will be necessary in parsing subexpressions,
399 but that can be handled there. Not handling backtracking here may get
400 expensive in the case of the m68k. Deal with later.
402 Returns NULL for success, an error message for failure. */
405 parse_insn_normal (cd, insn, strp, fields)
407 const CGEN_INSN *insn;
411 /* ??? Runtime added insns not handled yet. */
412 const CGEN_SYNTAX *syntax = CGEN_INSN_SYNTAX (insn);
413 const char *str = *strp;
416 const CGEN_SYNTAX_CHAR_TYPE * syn;
417 #ifdef CGEN_MNEMONIC_OPERANDS
422 /* For now we assume the mnemonic is first (there are no leading operands).
423 We can parse it without needing to set up operand parsing.
424 GAS's input scrubber will ensure mnemonics are lowercase, but we may
425 not be called from GAS. */
426 p = CGEN_INSN_MNEMONIC (insn);
427 while (*p && TOLOWER (*p) == TOLOWER (*str))
431 return _("unrecognized instruction");
433 #ifndef CGEN_MNEMONIC_OPERANDS
434 if (* str && ! ISSPACE (* str))
435 return _("unrecognized instruction");
438 CGEN_INIT_PARSE (cd);
439 cgen_init_parse_operand (cd);
440 #ifdef CGEN_MNEMONIC_OPERANDS
444 /* We don't check for (*str != '\0') here because we want to parse
445 any trailing fake arguments in the syntax string. */
446 syn = CGEN_SYNTAX_STRING (syntax);
448 /* Mnemonics come first for now, ensure valid string. */
449 if (! CGEN_SYNTAX_MNEMONIC_P (* syn))
456 /* Non operand chars must match exactly. */
457 if (CGEN_SYNTAX_CHAR_P (* syn))
459 /* FIXME: While we allow for non-GAS callers above, we assume the
460 first char after the mnemonic part is a space. */
461 /* FIXME: We also take inappropriate advantage of the fact that
462 GAS's input scrubber will remove extraneous blanks. */
463 if (TOLOWER (*str) == TOLOWER (CGEN_SYNTAX_CHAR (* syn)))
465 #ifdef CGEN_MNEMONIC_OPERANDS
466 if (CGEN_SYNTAX_CHAR(* syn) == ' ')
474 /* Syntax char didn't match. Can't be this insn. */
475 static char msg [80];
477 /* xgettext:c-format */
478 sprintf (msg, _("syntax error (expected char `%c', found `%c')"),
479 CGEN_SYNTAX_CHAR(*syn), *str);
484 /* Ran out of input. */
485 static char msg [80];
487 /* xgettext:c-format */
488 sprintf (msg, _("syntax error (expected char `%c', found end of instruction)"),
489 CGEN_SYNTAX_CHAR(*syn));
495 /* We have an operand of some sort. */
496 errmsg = openrisc_cgen_parse_operand (cd, CGEN_SYNTAX_FIELD (*syn),
501 /* Done with this operand, continue with next one. */
505 /* If we're at the end of the syntax string, we're done. */
508 /* FIXME: For the moment we assume a valid `str' can only contain
509 blanks now. IE: We needn't try again with a longer version of
510 the insn and it is assumed that longer versions of insns appear
511 before shorter ones (eg: lsr r2,r3,1 vs lsr r2,r3). */
512 while (ISSPACE (* str))
516 return _("junk at end of line"); /* FIXME: would like to include `str' */
521 /* We couldn't parse it. */
522 return _("unrecognized instruction");
526 This routine is called for each instruction to be assembled.
527 STR points to the insn to be assembled.
528 We assume all necessary tables have been initialized.
529 The assembled instruction, less any fixups, is stored in BUF.
530 Remember that if CGEN_INT_INSN_P then BUF is an int and thus the value
531 still needs to be converted to target byte order, otherwise BUF is an array
532 of bytes in target byte order.
533 The result is a pointer to the insn's entry in the opcode table,
534 or NULL if an error occured (an error message will have already been
537 Note that when processing (non-alias) macro-insns,
538 this function recurses.
540 ??? It's possible to make this cpu-independent.
541 One would have to deal with a few minor things.
542 At this point in time doing so would be more of a curiosity than useful
543 [for example this file isn't _that_ big], but keeping the possibility in
544 mind helps keep the design clean. */
547 openrisc_cgen_assemble_insn (cd, str, fields, buf, errmsg)
551 CGEN_INSN_BYTES_PTR buf;
555 CGEN_INSN_LIST *ilist;
556 const char *parse_errmsg = NULL;
557 const char *insert_errmsg = NULL;
558 int recognized_mnemonic = 0;
560 /* Skip leading white space. */
561 while (ISSPACE (* str))
564 /* The instructions are stored in hashed lists.
565 Get the first in the list. */
566 ilist = CGEN_ASM_LOOKUP_INSN (cd, str);
568 /* Keep looking until we find a match. */
570 for ( ; ilist != NULL ; ilist = CGEN_ASM_NEXT_INSN (ilist))
572 const CGEN_INSN *insn = ilist->insn;
573 recognized_mnemonic = 1;
575 #ifdef CGEN_VALIDATE_INSN_SUPPORTED
576 /* Not usually needed as unsupported opcodes
577 shouldn't be in the hash lists. */
578 /* Is this insn supported by the selected cpu? */
579 if (! openrisc_cgen_insn_supported (cd, insn))
582 /* If the RELAX attribute is set, this is an insn that shouldn't be
583 chosen immediately. Instead, it is used during assembler/linker
584 relaxation if possible. */
585 if (CGEN_INSN_ATTR_VALUE (insn, CGEN_INSN_RELAX) != 0)
590 /* Skip this insn if str doesn't look right lexically. */
591 if (CGEN_INSN_RX (insn) != NULL &&
592 regexec ((regex_t *) CGEN_INSN_RX (insn), str, 0, NULL, 0) == REG_NOMATCH)
595 /* Allow parse/insert handlers to obtain length of insn. */
596 CGEN_FIELDS_BITSIZE (fields) = CGEN_INSN_BITSIZE (insn);
598 parse_errmsg = CGEN_PARSE_FN (cd, insn) (cd, insn, & str, fields);
599 if (parse_errmsg != NULL)
602 /* ??? 0 is passed for `pc'. */
603 insert_errmsg = CGEN_INSERT_FN (cd, insn) (cd, insn, fields, buf,
605 if (insert_errmsg != NULL)
608 /* It is up to the caller to actually output the insn and any
614 static char errbuf[150];
615 #ifdef CGEN_VERBOSE_ASSEMBLER_ERRORS
616 const char *tmp_errmsg;
618 /* If requesting verbose error messages, use insert_errmsg.
619 Failing that, use parse_errmsg. */
620 tmp_errmsg = (insert_errmsg ? insert_errmsg :
621 parse_errmsg ? parse_errmsg :
622 recognized_mnemonic ?
623 _("unrecognized form of instruction") :
624 _("unrecognized instruction"));
626 if (strlen (start) > 50)
627 /* xgettext:c-format */
628 sprintf (errbuf, "%s `%.50s...'", tmp_errmsg, start);
630 /* xgettext:c-format */
631 sprintf (errbuf, "%s `%.50s'", tmp_errmsg, start);
633 if (strlen (start) > 50)
634 /* xgettext:c-format */
635 sprintf (errbuf, _("bad instruction `%.50s...'"), start);
637 /* xgettext:c-format */
638 sprintf (errbuf, _("bad instruction `%.50s'"), start);
646 #if 0 /* This calls back to GAS which we can't do without care. */
648 /* Record each member of OPVALS in the assembler's symbol table.
649 This lets GAS parse registers for us.
650 ??? Interesting idea but not currently used. */
652 /* Record each member of OPVALS in the assembler's symbol table.
653 FIXME: Not currently used. */
656 openrisc_cgen_asm_hash_keywords (cd, opvals)
658 CGEN_KEYWORD *opvals;
660 CGEN_KEYWORD_SEARCH search = cgen_keyword_search_init (opvals, NULL);
661 const CGEN_KEYWORD_ENTRY * ke;
663 while ((ke = cgen_keyword_search_next (& search)) != NULL)
665 #if 0 /* Unnecessary, should be done in the search routine. */
666 if (! openrisc_cgen_opval_supported (ke))
669 cgen_asm_record_register (cd, ke->name, ke->value);