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 (C) 1996-2016 Free Software Foundation, Inc.
9 This file is part of libopcodes.
11 This library 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 3, or (at your option)
16 It is distributed in the hope that it will be useful, but WITHOUT
17 ANY WARRANTY; without even the implied warranty of MERCHANTABILITY
18 or FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public
19 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. */
26 /* ??? Eventually more and more of this stuff can go to cpu-independent files.
34 #include "@prefix@-desc.h"
35 #include "@prefix@-opc.h"
38 #include "libiberty.h"
39 #include "safe-ctype.h"
42 #define min(a,b) ((a) < (b) ? (a) : (b))
44 #define max(a,b) ((a) > (b) ? (a) : (b))
46 static const char * parse_insn_normal
47 (CGEN_CPU_DESC, const CGEN_INSN *, const char **, CGEN_FIELDS *);
49 /* -- assembler routines inserted here. */
52 /* Regex construction routine.
54 This translates an opcode syntax string into a regex string,
55 by replacing any non-character syntax element (such as an
56 opcode) with the pattern '.*'
58 It then compiles the regex and stores it in the opcode, for
59 later use by @arch@_cgen_assemble_insn
61 Returns NULL for success, an error message for failure. */
64 @arch@_cgen_build_insn_regex (CGEN_INSN *insn)
66 CGEN_OPCODE *opc = (CGEN_OPCODE *) CGEN_INSN_OPCODE (insn);
67 const char *mnem = CGEN_INSN_MNEMONIC (insn);
68 char rxbuf[CGEN_MAX_RX_ELEMENTS];
70 const CGEN_SYNTAX_CHAR_TYPE *syn;
73 syn = CGEN_SYNTAX_STRING (CGEN_OPCODE_SYNTAX (opc));
75 /* Mnemonics come first in the syntax string. */
76 if (! CGEN_SYNTAX_MNEMONIC_P (* syn))
77 return _("missing mnemonic in syntax string");
80 /* Generate a case sensitive regular expression that emulates case
81 insensitive matching in the "C" locale. We cannot generate a case
82 insensitive regular expression because in Turkish locales, 'i' and 'I'
83 are not equal modulo case conversion. */
85 /* Copy the literal mnemonic out of the insn. */
101 /* Copy any remaining literals from the syntax string into the rx. */
102 for(; * syn != 0 && rx <= rxbuf + (CGEN_MAX_RX_ELEMENTS - 7 - 4); ++syn)
104 if (CGEN_SYNTAX_CHAR_P (* syn))
106 char c = CGEN_SYNTAX_CHAR (* syn);
110 /* Escape any regex metacharacters in the syntax. */
111 case '.': case '[': case '\\':
112 case '*': case '^': case '$':
114 #ifdef CGEN_ESCAPE_EXTENDED_REGEX
115 case '?': case '{': case '}':
116 case '(': case ')': case '*':
117 case '|': case '+': case ']':
138 /* Replace non-syntax fields with globs. */
144 /* Trailing whitespace ok. */
151 /* But anchor it after that. */
155 CGEN_INSN_RX (insn) = xmalloc (sizeof (regex_t));
156 reg_err = regcomp ((regex_t *) CGEN_INSN_RX (insn), rxbuf, REG_NOSUB);
164 regerror (reg_err, (regex_t *) CGEN_INSN_RX (insn), msg, 80);
165 regfree ((regex_t *) CGEN_INSN_RX (insn));
166 free (CGEN_INSN_RX (insn));
167 (CGEN_INSN_RX (insn)) = NULL;
173 /* Default insn parser.
175 The syntax string is scanned and operands are parsed and stored in FIELDS.
176 Relocs are queued as we go via other callbacks.
178 ??? Note that this is currently an all-or-nothing parser. If we fail to
179 parse the instruction, we return 0 and the caller will start over from
180 the beginning. Backtracking will be necessary in parsing subexpressions,
181 but that can be handled there. Not handling backtracking here may get
182 expensive in the case of the m68k. Deal with later.
184 Returns NULL for success, an error message for failure. */
187 parse_insn_normal (CGEN_CPU_DESC cd,
188 const CGEN_INSN *insn,
192 /* ??? Runtime added insns not handled yet. */
193 const CGEN_SYNTAX *syntax = CGEN_INSN_SYNTAX (insn);
194 const char *str = *strp;
197 const CGEN_SYNTAX_CHAR_TYPE * syn;
198 #ifdef CGEN_MNEMONIC_OPERANDS
203 /* For now we assume the mnemonic is first (there are no leading operands).
204 We can parse it without needing to set up operand parsing.
205 GAS's input scrubber will ensure mnemonics are lowercase, but we may
206 not be called from GAS. */
207 p = CGEN_INSN_MNEMONIC (insn);
208 while (*p && TOLOWER (*p) == TOLOWER (*str))
212 return _("unrecognized instruction");
214 #ifndef CGEN_MNEMONIC_OPERANDS
215 if (* str && ! ISSPACE (* str))
216 return _("unrecognized instruction");
219 CGEN_INIT_PARSE (cd);
220 cgen_init_parse_operand (cd);
221 #ifdef CGEN_MNEMONIC_OPERANDS
225 /* We don't check for (*str != '\0') here because we want to parse
226 any trailing fake arguments in the syntax string. */
227 syn = CGEN_SYNTAX_STRING (syntax);
229 /* Mnemonics come first for now, ensure valid string. */
230 if (! CGEN_SYNTAX_MNEMONIC_P (* syn))
237 /* Non operand chars must match exactly. */
238 if (CGEN_SYNTAX_CHAR_P (* syn))
240 /* FIXME: While we allow for non-GAS callers above, we assume the
241 first char after the mnemonic part is a space. */
242 /* FIXME: We also take inappropriate advantage of the fact that
243 GAS's input scrubber will remove extraneous blanks. */
244 if (TOLOWER (*str) == TOLOWER (CGEN_SYNTAX_CHAR (* syn)))
246 #ifdef CGEN_MNEMONIC_OPERANDS
247 if (CGEN_SYNTAX_CHAR(* syn) == ' ')
255 /* Syntax char didn't match. Can't be this insn. */
256 static char msg [80];
258 /* xgettext:c-format */
259 sprintf (msg, _("syntax error (expected char `%c', found `%c')"),
260 CGEN_SYNTAX_CHAR(*syn), *str);
265 /* Ran out of input. */
266 static char msg [80];
268 /* xgettext:c-format */
269 sprintf (msg, _("syntax error (expected char `%c', found end of instruction)"),
270 CGEN_SYNTAX_CHAR(*syn));
276 #ifdef CGEN_MNEMONIC_OPERANDS
277 (void) past_opcode_p;
279 /* We have an operand of some sort. */
280 errmsg = cd->parse_operand (cd, CGEN_SYNTAX_FIELD (*syn), &str, fields);
284 /* Done with this operand, continue with next one. */
288 /* If we're at the end of the syntax string, we're done. */
291 /* FIXME: For the moment we assume a valid `str' can only contain
292 blanks now. IE: We needn't try again with a longer version of
293 the insn and it is assumed that longer versions of insns appear
294 before shorter ones (eg: lsr r2,r3,1 vs lsr r2,r3). */
295 while (ISSPACE (* str))
299 return _("junk at end of line"); /* FIXME: would like to include `str' */
304 /* We couldn't parse it. */
305 return _("unrecognized instruction");
309 This routine is called for each instruction to be assembled.
310 STR points to the insn to be assembled.
311 We assume all necessary tables have been initialized.
312 The assembled instruction, less any fixups, is stored in BUF.
313 Remember that if CGEN_INT_INSN_P then BUF is an int and thus the value
314 still needs to be converted to target byte order, otherwise BUF is an array
315 of bytes in target byte order.
316 The result is a pointer to the insn's entry in the opcode table,
317 or NULL if an error occured (an error message will have already been
320 Note that when processing (non-alias) macro-insns,
321 this function recurses.
323 ??? It's possible to make this cpu-independent.
324 One would have to deal with a few minor things.
325 At this point in time doing so would be more of a curiosity than useful
326 [for example this file isn't _that_ big], but keeping the possibility in
327 mind helps keep the design clean. */
330 @arch@_cgen_assemble_insn (CGEN_CPU_DESC cd,
333 CGEN_INSN_BYTES_PTR buf,
337 CGEN_INSN_LIST *ilist;
338 const char *parse_errmsg = NULL;
339 const char *insert_errmsg = NULL;
340 int recognized_mnemonic = 0;
342 /* Skip leading white space. */
343 while (ISSPACE (* str))
346 /* The instructions are stored in hashed lists.
347 Get the first in the list. */
348 ilist = CGEN_ASM_LOOKUP_INSN (cd, str);
350 /* Keep looking until we find a match. */
352 for ( ; ilist != NULL ; ilist = CGEN_ASM_NEXT_INSN (ilist))
354 const CGEN_INSN *insn = ilist->insn;
355 recognized_mnemonic = 1;
357 #ifdef CGEN_VALIDATE_INSN_SUPPORTED
358 /* Not usually needed as unsupported opcodes
359 shouldn't be in the hash lists. */
360 /* Is this insn supported by the selected cpu? */
361 if (! @arch@_cgen_insn_supported (cd, insn))
364 /* If the RELAXED attribute is set, this is an insn that shouldn't be
365 chosen immediately. Instead, it is used during assembler/linker
366 relaxation if possible. */
367 if (CGEN_INSN_ATTR_VALUE (insn, CGEN_INSN_RELAXED) != 0)
372 /* Skip this insn if str doesn't look right lexically. */
373 if (CGEN_INSN_RX (insn) != NULL &&
374 regexec ((regex_t *) CGEN_INSN_RX (insn), str, 0, NULL, 0) == REG_NOMATCH)
377 /* Allow parse/insert handlers to obtain length of insn. */
378 CGEN_FIELDS_BITSIZE (fields) = CGEN_INSN_BITSIZE (insn);
380 parse_errmsg = CGEN_PARSE_FN (cd, insn) (cd, insn, & str, fields);
381 if (parse_errmsg != NULL)
384 /* ??? 0 is passed for `pc'. */
385 insert_errmsg = CGEN_INSERT_FN (cd, insn) (cd, insn, fields, buf,
387 if (insert_errmsg != NULL)
390 /* It is up to the caller to actually output the insn and any
396 static char errbuf[150];
397 const char *tmp_errmsg;
398 #ifdef CGEN_VERBOSE_ASSEMBLER_ERRORS
406 /* If requesting verbose error messages, use insert_errmsg.
407 Failing that, use parse_errmsg. */
408 tmp_errmsg = (insert_errmsg ? insert_errmsg :
409 parse_errmsg ? parse_errmsg :
410 recognized_mnemonic ?
411 _("unrecognized form of instruction") :
412 _("unrecognized instruction"));
414 if (strlen (start) > 50)
415 /* xgettext:c-format */
416 sprintf (errbuf, "%s `%.50s...'", tmp_errmsg, start);
418 /* xgettext:c-format */
419 sprintf (errbuf, "%s `%.50s'", tmp_errmsg, start);
423 if (strlen (start) > 50)
424 /* xgettext:c-format */
425 sprintf (errbuf, _("bad instruction `%.50s...'"), start);
427 /* xgettext:c-format */
428 sprintf (errbuf, _("bad instruction `%.50s'"), start);