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 51 Franklin Street - Fifth Floor, Boston, MA 02110-1301, USA. */
25 /* ??? Eventually more and more of this stuff can go to cpu-independent files.
33 #include "@prefix@-desc.h"
34 #include "@prefix@-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 (CGEN_CPU_DESC, const CGEN_INSN *, const char **, CGEN_FIELDS *);
48 /* -- assembler routines inserted here. */
51 /* Regex construction routine.
53 This translates an opcode syntax string into a regex string,
54 by replacing any non-character syntax element (such as an
55 opcode) with the pattern '.*'
57 It then compiles the regex and stores it in the opcode, for
58 later use by @arch@_cgen_assemble_insn
60 Returns NULL for success, an error message for failure. */
63 @arch@_cgen_build_insn_regex (CGEN_INSN *insn)
65 CGEN_OPCODE *opc = (CGEN_OPCODE *) CGEN_INSN_OPCODE (insn);
66 const char *mnem = CGEN_INSN_MNEMONIC (insn);
67 char rxbuf[CGEN_MAX_RX_ELEMENTS];
69 const CGEN_SYNTAX_CHAR_TYPE *syn;
72 syn = CGEN_SYNTAX_STRING (CGEN_OPCODE_SYNTAX (opc));
74 /* Mnemonics come first in the syntax string. */
75 if (! CGEN_SYNTAX_MNEMONIC_P (* syn))
76 return _("missing mnemonic in syntax string");
79 /* Generate a case sensitive regular expression that emulates case
80 insensitive matching in the "C" locale. We cannot generate a case
81 insensitive regular expression because in Turkish locales, 'i' and 'I'
82 are not equal modulo case conversion. */
84 /* Copy the literal mnemonic out of the insn. */
100 /* Copy any remaining literals from the syntax string into the rx. */
101 for(; * syn != 0 && rx <= rxbuf + (CGEN_MAX_RX_ELEMENTS - 7 - 4); ++syn)
103 if (CGEN_SYNTAX_CHAR_P (* syn))
105 char c = CGEN_SYNTAX_CHAR (* syn);
109 /* Escape any regex metacharacters in the syntax. */
110 case '.': case '[': case '\\':
111 case '*': case '^': case '$':
113 #ifdef CGEN_ESCAPE_EXTENDED_REGEX
114 case '?': case '{': case '}':
115 case '(': case ')': case '*':
116 case '|': case '+': case ']':
137 /* Replace non-syntax fields with globs. */
143 /* Trailing whitespace ok. */
150 /* But anchor it after that. */
154 CGEN_INSN_RX (insn) = xmalloc (sizeof (regex_t));
155 reg_err = regcomp ((regex_t *) CGEN_INSN_RX (insn), rxbuf, REG_NOSUB);
163 regerror (reg_err, (regex_t *) CGEN_INSN_RX (insn), msg, 80);
164 regfree ((regex_t *) CGEN_INSN_RX (insn));
165 free (CGEN_INSN_RX (insn));
166 (CGEN_INSN_RX (insn)) = NULL;
172 /* Default insn parser.
174 The syntax string is scanned and operands are parsed and stored in FIELDS.
175 Relocs are queued as we go via other callbacks.
177 ??? Note that this is currently an all-or-nothing parser. If we fail to
178 parse the instruction, we return 0 and the caller will start over from
179 the beginning. Backtracking will be necessary in parsing subexpressions,
180 but that can be handled there. Not handling backtracking here may get
181 expensive in the case of the m68k. Deal with later.
183 Returns NULL for success, an error message for failure. */
186 parse_insn_normal (CGEN_CPU_DESC cd,
187 const CGEN_INSN *insn,
191 /* ??? Runtime added insns not handled yet. */
192 const CGEN_SYNTAX *syntax = CGEN_INSN_SYNTAX (insn);
193 const char *str = *strp;
196 const CGEN_SYNTAX_CHAR_TYPE * syn;
197 #ifdef CGEN_MNEMONIC_OPERANDS
202 /* For now we assume the mnemonic is first (there are no leading operands).
203 We can parse it without needing to set up operand parsing.
204 GAS's input scrubber will ensure mnemonics are lowercase, but we may
205 not be called from GAS. */
206 p = CGEN_INSN_MNEMONIC (insn);
207 while (*p && TOLOWER (*p) == TOLOWER (*str))
211 return _("unrecognized instruction");
213 #ifndef CGEN_MNEMONIC_OPERANDS
214 if (* str && ! ISSPACE (* str))
215 return _("unrecognized instruction");
218 CGEN_INIT_PARSE (cd);
219 cgen_init_parse_operand (cd);
220 #ifdef CGEN_MNEMONIC_OPERANDS
224 /* We don't check for (*str != '\0') here because we want to parse
225 any trailing fake arguments in the syntax string. */
226 syn = CGEN_SYNTAX_STRING (syntax);
228 /* Mnemonics come first for now, ensure valid string. */
229 if (! CGEN_SYNTAX_MNEMONIC_P (* syn))
236 /* Non operand chars must match exactly. */
237 if (CGEN_SYNTAX_CHAR_P (* syn))
239 /* FIXME: While we allow for non-GAS callers above, we assume the
240 first char after the mnemonic part is a space. */
241 /* FIXME: We also take inappropriate advantage of the fact that
242 GAS's input scrubber will remove extraneous blanks. */
243 if (TOLOWER (*str) == TOLOWER (CGEN_SYNTAX_CHAR (* syn)))
245 #ifdef CGEN_MNEMONIC_OPERANDS
246 if (CGEN_SYNTAX_CHAR(* syn) == ' ')
254 /* Syntax char didn't match. Can't be this insn. */
255 static char msg [80];
257 /* xgettext:c-format */
258 sprintf (msg, _("syntax error (expected char `%c', found `%c')"),
259 CGEN_SYNTAX_CHAR(*syn), *str);
264 /* Ran out of input. */
265 static char msg [80];
267 /* xgettext:c-format */
268 sprintf (msg, _("syntax error (expected char `%c', found end of instruction)"),
269 CGEN_SYNTAX_CHAR(*syn));
275 /* We have an operand of some sort. */
276 errmsg = cd->parse_operand (cd, CGEN_SYNTAX_FIELD (*syn),
281 /* Done with this operand, continue with next one. */
285 /* If we're at the end of the syntax string, we're done. */
288 /* FIXME: For the moment we assume a valid `str' can only contain
289 blanks now. IE: We needn't try again with a longer version of
290 the insn and it is assumed that longer versions of insns appear
291 before shorter ones (eg: lsr r2,r3,1 vs lsr r2,r3). */
292 while (ISSPACE (* str))
296 return _("junk at end of line"); /* FIXME: would like to include `str' */
301 /* We couldn't parse it. */
302 return _("unrecognized instruction");
306 This routine is called for each instruction to be assembled.
307 STR points to the insn to be assembled.
308 We assume all necessary tables have been initialized.
309 The assembled instruction, less any fixups, is stored in BUF.
310 Remember that if CGEN_INT_INSN_P then BUF is an int and thus the value
311 still needs to be converted to target byte order, otherwise BUF is an array
312 of bytes in target byte order.
313 The result is a pointer to the insn's entry in the opcode table,
314 or NULL if an error occured (an error message will have already been
317 Note that when processing (non-alias) macro-insns,
318 this function recurses.
320 ??? It's possible to make this cpu-independent.
321 One would have to deal with a few minor things.
322 At this point in time doing so would be more of a curiosity than useful
323 [for example this file isn't _that_ big], but keeping the possibility in
324 mind helps keep the design clean. */
327 @arch@_cgen_assemble_insn (CGEN_CPU_DESC cd,
330 CGEN_INSN_BYTES_PTR buf,
334 CGEN_INSN_LIST *ilist;
335 const char *parse_errmsg = NULL;
336 const char *insert_errmsg = NULL;
337 int recognized_mnemonic = 0;
339 /* Skip leading white space. */
340 while (ISSPACE (* str))
343 /* The instructions are stored in hashed lists.
344 Get the first in the list. */
345 ilist = CGEN_ASM_LOOKUP_INSN (cd, str);
347 /* Keep looking until we find a match. */
349 for ( ; ilist != NULL ; ilist = CGEN_ASM_NEXT_INSN (ilist))
351 const CGEN_INSN *insn = ilist->insn;
352 recognized_mnemonic = 1;
354 #ifdef CGEN_VALIDATE_INSN_SUPPORTED
355 /* Not usually needed as unsupported opcodes
356 shouldn't be in the hash lists. */
357 /* Is this insn supported by the selected cpu? */
358 if (! @arch@_cgen_insn_supported (cd, insn))
361 /* If the RELAXED attribute is set, this is an insn that shouldn't be
362 chosen immediately. Instead, it is used during assembler/linker
363 relaxation if possible. */
364 if (CGEN_INSN_ATTR_VALUE (insn, CGEN_INSN_RELAXED) != 0)
369 /* Skip this insn if str doesn't look right lexically. */
370 if (CGEN_INSN_RX (insn) != NULL &&
371 regexec ((regex_t *) CGEN_INSN_RX (insn), str, 0, NULL, 0) == REG_NOMATCH)
374 /* Allow parse/insert handlers to obtain length of insn. */
375 CGEN_FIELDS_BITSIZE (fields) = CGEN_INSN_BITSIZE (insn);
377 parse_errmsg = CGEN_PARSE_FN (cd, insn) (cd, insn, & str, fields);
378 if (parse_errmsg != NULL)
381 /* ??? 0 is passed for `pc'. */
382 insert_errmsg = CGEN_INSERT_FN (cd, insn) (cd, insn, fields, buf,
384 if (insert_errmsg != NULL)
387 /* It is up to the caller to actually output the insn and any
393 static char errbuf[150];
394 #ifdef CGEN_VERBOSE_ASSEMBLER_ERRORS
395 const char *tmp_errmsg;
397 /* If requesting verbose error messages, use insert_errmsg.
398 Failing that, use parse_errmsg. */
399 tmp_errmsg = (insert_errmsg ? insert_errmsg :
400 parse_errmsg ? parse_errmsg :
401 recognized_mnemonic ?
402 _("unrecognized form of instruction") :
403 _("unrecognized instruction"));
405 if (strlen (start) > 50)
406 /* xgettext:c-format */
407 sprintf (errbuf, "%s `%.50s...'", tmp_errmsg, start);
409 /* xgettext:c-format */
410 sprintf (errbuf, "%s `%.50s'", tmp_errmsg, start);
412 if (strlen (start) > 50)
413 /* xgettext:c-format */
414 sprintf (errbuf, _("bad instruction `%.50s...'"), start);
416 /* xgettext:c-format */
417 sprintf (errbuf, _("bad instruction `%.50s'"), start);
425 #if 0 /* This calls back to GAS which we can't do without care. */
427 /* Record each member of OPVALS in the assembler's symbol table.
428 This lets GAS parse registers for us.
429 ??? Interesting idea but not currently used. */
431 /* Record each member of OPVALS in the assembler's symbol table.
432 FIXME: Not currently used. */
435 @arch@_cgen_asm_hash_keywords (CGEN_CPU_DESC cd, CGEN_KEYWORD *opvals)
437 CGEN_KEYWORD_SEARCH search = cgen_keyword_search_init (opvals, NULL);
438 const CGEN_KEYWORD_ENTRY * ke;
440 while ((ke = cgen_keyword_search_next (& search)) != NULL)
442 #if 0 /* Unnecessary, should be done in the search routine. */
443 if (! @arch@_cgen_opval_supported (ke))
446 cgen_asm_record_register (cd, ke->name, ke->value);