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.
34 #include "@prefix@-desc.h"
35 #include "@prefix@-opc.h"
40 #define min(a,b) ((a) < (b) ? (a) : (b))
42 #define max(a,b) ((a) > (b) ? (a) : (b))
44 static const char * parse_insn_normal
45 PARAMS ((CGEN_CPU_DESC, const CGEN_INSN *, const char **, CGEN_FIELDS *));
47 /* -- 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
64 @arch@_cgen_build_insn_regex (insn)
67 CGEN_OPCODE *opc = CGEN_INSN_OPCODE (insn);
68 const char *mnem = CGEN_INSN_MNEMONIC (insn);
70 char rxbuf[CGEN_MAX_RX_ELEMENTS];
72 const CGEN_SYNTAX_CHAR_TYPE *syn;
75 syn = CGEN_SYNTAX_STRING (CGEN_OPCODE_SYNTAX (opc));
77 /* Mnemonics come first in the syntax string */
78 if (! CGEN_SYNTAX_MNEMONIC_P (* syn)) return "missing mnemonic in syntax string";
81 /* copy the literal mnemonic out of the insn */
82 memset (rx, 0, CGEN_MAX_RX_ELEMENTS);
83 mnem_len = strlen(mnem);
84 memcpy (rx, mnem, mnem_len);
87 /* copy any remaining literals from the syntax string into the rx */
88 for(; * syn != 0 && rx < rxbuf + (CGEN_MAX_RX_ELEMENTS - 9); ++syn, ++rx)
90 if (CGEN_SYNTAX_CHAR_P (* syn))
92 char tmp = CGEN_SYNTAX_CHAR (* syn);
95 /* escape any regex metacharacters in the syntax */
96 case '.': case '[': case '\\':
97 case '*': case '^': case '$':
99 #ifdef CGEN_ESCAPE_EXTENDED_REGEX
100 case '?': case '{': case '}':
101 case '(': case ')': case '*':
102 case '|': case '+': case ']':
108 /* insert syntax char into rx */
113 /* replace non-syntax fields with globs */
119 /* trailing whitespace ok */
126 /* but anchor it after that */
130 CGEN_INSN_RX (insn) = xmalloc (sizeof (regex_t));
131 reg_err = regcomp ((regex_t *) CGEN_INSN_RX (insn), rxbuf, REG_NOSUB|REG_ICASE);
138 regerror (reg_err, (regex_t *) CGEN_INSN_RX (insn), msg, 80);
139 regfree ((regex_t *) CGEN_INSN_RX (insn));
140 free (CGEN_INSN_RX (insn));
141 (CGEN_INSN_RX (insn)) = NULL;
147 /* Default insn parser.
149 The syntax string is scanned and operands are parsed and stored in FIELDS.
150 Relocs are queued as we go via other callbacks.
152 ??? Note that this is currently an all-or-nothing parser. If we fail to
153 parse the instruction, we return 0 and the caller will start over from
154 the beginning. Backtracking will be necessary in parsing subexpressions,
155 but that can be handled there. Not handling backtracking here may get
156 expensive in the case of the m68k. Deal with later.
158 Returns NULL for success, an error message for failure.
162 parse_insn_normal (cd, insn, strp, fields)
164 const CGEN_INSN *insn;
168 /* ??? Runtime added insns not handled yet. */
169 const CGEN_SYNTAX *syntax = CGEN_INSN_SYNTAX (insn);
170 const char *str = *strp;
173 const CGEN_SYNTAX_CHAR_TYPE * syn;
174 #ifdef CGEN_MNEMONIC_OPERANDS
179 /* For now we assume the mnemonic is first (there are no leading operands).
180 We can parse it without needing to set up operand parsing.
181 GAS's input scrubber will ensure mnemonics are lowercase, but we may
182 not be called from GAS. */
183 p = CGEN_INSN_MNEMONIC (insn);
184 while (*p && tolower (*p) == tolower (*str))
188 return _("unrecognized instruction");
190 #ifndef CGEN_MNEMONIC_OPERANDS
191 if (* str && !isspace (* str))
192 return _("unrecognized instruction");
195 CGEN_INIT_PARSE (cd);
196 cgen_init_parse_operand (cd);
197 #ifdef CGEN_MNEMONIC_OPERANDS
201 /* We don't check for (*str != '\0') here because we want to parse
202 any trailing fake arguments in the syntax string. */
203 syn = CGEN_SYNTAX_STRING (syntax);
205 /* Mnemonics come first for now, ensure valid string. */
206 if (! CGEN_SYNTAX_MNEMONIC_P (* syn))
213 /* Non operand chars must match exactly. */
214 if (CGEN_SYNTAX_CHAR_P (* syn))
216 /* FIXME: While we allow for non-GAS callers above, we assume the
217 first char after the mnemonic part is a space. */
218 /* FIXME: We also take inappropriate advantage of the fact that
219 GAS's input scrubber will remove extraneous blanks. */
220 if (tolower (*str) == tolower (CGEN_SYNTAX_CHAR (* syn)))
222 #ifdef CGEN_MNEMONIC_OPERANDS
223 if (CGEN_SYNTAX_CHAR(* syn) == ' ')
231 /* Syntax char didn't match. Can't be this insn. */
232 static char msg [80];
233 /* xgettext:c-format */
234 sprintf (msg, _("syntax error (expected char `%c', found `%c')"),
235 CGEN_SYNTAX_CHAR(*syn), *str);
240 /* Ran out of input. */
241 static char msg [80];
242 /* xgettext:c-format */
243 sprintf (msg, _("syntax error (expected char `%c', found end of instruction)"),
244 CGEN_SYNTAX_CHAR(*syn));
250 /* We have an operand of some sort. */
251 errmsg = @arch@_cgen_parse_operand (cd, CGEN_SYNTAX_FIELD (*syn),
256 /* Done with this operand, continue with next one. */
260 /* If we're at the end of the syntax string, we're done. */
263 /* FIXME: For the moment we assume a valid `str' can only contain
264 blanks now. IE: We needn't try again with a longer version of
265 the insn and it is assumed that longer versions of insns appear
266 before shorter ones (eg: lsr r2,r3,1 vs lsr r2,r3). */
267 while (isspace (* str))
271 return _("junk at end of line"); /* FIXME: would like to include `str' */
276 /* We couldn't parse it. */
277 return _("unrecognized instruction");
281 This routine is called for each instruction to be assembled.
282 STR points to the insn to be assembled.
283 We assume all necessary tables have been initialized.
284 The assembled instruction, less any fixups, is stored in BUF.
285 Remember that if CGEN_INT_INSN_P then BUF is an int and thus the value
286 still needs to be converted to target byte order, otherwise BUF is an array
287 of bytes in target byte order.
288 The result is a pointer to the insn's entry in the opcode table,
289 or NULL if an error occured (an error message will have already been
292 Note that when processing (non-alias) macro-insns,
293 this function recurses.
295 ??? It's possible to make this cpu-independent.
296 One would have to deal with a few minor things.
297 At this point in time doing so would be more of a curiosity than useful
298 [for example this file isn't _that_ big], but keeping the possibility in
299 mind helps keep the design clean. */
302 @arch@_cgen_assemble_insn (cd, str, fields, buf, errmsg)
306 CGEN_INSN_BYTES_PTR buf;
310 CGEN_INSN_LIST *ilist;
311 const char *parse_errmsg = NULL;
312 const char *insert_errmsg = NULL;
313 int recognized_mnemonic = 0;
315 /* Skip leading white space. */
316 while (isspace (* str))
319 /* The instructions are stored in hashed lists.
320 Get the first in the list. */
321 ilist = CGEN_ASM_LOOKUP_INSN (cd, str);
323 /* Keep looking until we find a match. */
326 for ( ; ilist != NULL ; ilist = CGEN_ASM_NEXT_INSN (ilist))
328 const CGEN_INSN *insn = ilist->insn;
329 recognized_mnemonic = 1;
331 #ifdef CGEN_VALIDATE_INSN_SUPPORTED
332 /* not usually needed as unsupported opcodes shouldn't be in the hash lists */
333 /* Is this insn supported by the selected cpu? */
334 if (! @arch@_cgen_insn_supported (cd, insn))
338 /* If the RELAX attribute is set, this is an insn that shouldn't be
339 chosen immediately. Instead, it is used during assembler/linker
340 relaxation if possible. */
341 if (CGEN_INSN_ATTR_VALUE (insn, CGEN_INSN_RELAX) != 0)
346 /* skip this insn if str doesn't look right lexically */
347 if (CGEN_INSN_RX (insn) != NULL &&
348 regexec ((regex_t *) CGEN_INSN_RX (insn), str, 0, NULL, 0) == REG_NOMATCH)
351 /* Allow parse/insert handlers to obtain length of insn. */
352 CGEN_FIELDS_BITSIZE (fields) = CGEN_INSN_BITSIZE (insn);
354 parse_errmsg = CGEN_PARSE_FN (cd, insn) (cd, insn, & str, fields);
355 if (parse_errmsg != NULL)
358 /* ??? 0 is passed for `pc' */
359 insert_errmsg = CGEN_INSERT_FN (cd, insn) (cd, insn, fields, buf,
361 if (insert_errmsg != NULL)
364 /* It is up to the caller to actually output the insn and any
370 static char errbuf[150];
371 #ifdef CGEN_VERBOSE_ASSEMBLER_ERRORS
372 const char *tmp_errmsg;
374 /* If requesting verbose error messages, use insert_errmsg.
375 Failing that, use parse_errmsg */
376 tmp_errmsg = (insert_errmsg ? insert_errmsg :
377 parse_errmsg ? parse_errmsg :
378 recognized_mnemonic ? _("unrecognized form of instruction") :
379 _("unrecognized instruction"));
381 if (strlen (start) > 50)
382 /* xgettext:c-format */
383 sprintf (errbuf, "%s `%.50s...'", tmp_errmsg, start);
385 /* xgettext:c-format */
386 sprintf (errbuf, "%s `%.50s'", tmp_errmsg, start);
388 if (strlen (start) > 50)
389 /* xgettext:c-format */
390 sprintf (errbuf, _("bad instruction `%.50s...'"), start);
392 /* xgettext:c-format */
393 sprintf (errbuf, _("bad instruction `%.50s'"), start);
401 #if 0 /* This calls back to GAS which we can't do without care. */
403 /* Record each member of OPVALS in the assembler's symbol table.
404 This lets GAS parse registers for us.
405 ??? Interesting idea but not currently used. */
407 /* Record each member of OPVALS in the assembler's symbol table.
408 FIXME: Not currently used. */
411 @arch@_cgen_asm_hash_keywords (cd, opvals)
413 CGEN_KEYWORD *opvals;
415 CGEN_KEYWORD_SEARCH search = cgen_keyword_search_init (opvals, NULL);
416 const CGEN_KEYWORD_ENTRY * ke;
418 while ((ke = cgen_keyword_search_next (& search)) != NULL)
420 #if 0 /* Unnecessary, should be done in the search routine. */
421 if (! @arch@_cgen_opval_supported (ke))
424 cgen_asm_record_register (cd, ke->name, ke->value);