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 "openrisc-desc.h"
35 #include "openrisc-opc.h"
39 #define min(a,b) ((a) < (b) ? (a) : (b))
41 #define max(a,b) ((a) > (b) ? (a) : (b))
43 static const char * parse_insn_normal
44 PARAMS ((CGEN_CPU_DESC, const CGEN_INSN *, const char **, CGEN_FIELDS *));
46 /* -- assembler routines inserted here */
50 #define CGEN_VERBOSE_ASSEMBLER_ERRORS
53 openrisc_sign_extend_16bit (value)
56 return (long) (short) value;
63 parse_hi16 (cd, strp, opindex, valuep)
67 unsigned long *valuep;
70 enum cgen_parse_operand_result result_type;
76 if (strncasecmp (*strp, "hi(", 3) == 0)
81 errmsg = cgen_parse_signed_integer (cd, strp, opindex, valuep);
83 fprintf (stderr, "parse_hi: %s\n", errmsg);
86 errmsg = cgen_parse_address (cd, strp, opindex, BFD_RELOC_HI16,
87 &result_type, &value);
92 && result_type == CGEN_PARSE_OPERAND_RESULT_NUMBER)
94 *valuep = (long) (short) value;
101 errmsg = cgen_parse_signed_integer (cd, strp, opindex, (long *) &value);
103 errmsg = cgen_parse_unsigned_integer (cd, strp, opindex, &value);
105 *valuep = (long) (short) (value & 0xffff);
113 parse_lo16 (cd, strp, opindex, valuep)
117 unsigned long *valuep;
120 enum cgen_parse_operand_result result_type;
126 if (strncasecmp (*strp, "lo(", 3) == 0)
131 errmsg = cgen_parse_signed_integer (cd, strp, opindex, valuep);
133 fprintf (stderr, "parse_lo: %s\n", errmsg);
137 errmsg = cgen_parse_address (cd, strp, opindex, BFD_RELOC_LO16,
138 &result_type, &value);
140 return "missing `)'";
143 && result_type == CGEN_PARSE_OPERAND_RESULT_NUMBER)
145 *valuep = (long) (short) value;
151 errmsg = cgen_parse_signed_integer (cd, strp, opindex, (long *) &value);
153 errmsg = cgen_parse_unsigned_integer (cd, strp, opindex, &value);
154 *valuep = (long) (short) (value & 0xffff);
160 /* Main entry point for operand parsing.
162 This function is basically just a big switch statement. Earlier versions
163 used tables to look up the function to use, but
164 - if the table contains both assembler and disassembler functions then
165 the disassembler contains much of the assembler and vice-versa,
166 - there's a lot of inlining possibilities as things grow,
167 - using a switch statement avoids the function call overhead.
169 This function could be moved into `parse_insn_normal', but keeping it
170 separate makes clear the interface between `parse_insn_normal' and each of
175 openrisc_cgen_parse_operand (cd, opindex, strp, fields)
179 CGEN_FIELDS * fields;
181 const char * errmsg = NULL;
182 /* Used by scalar operands that still need to be parsed. */
187 case OPENRISC_OPERAND_ABS_26 :
190 errmsg = cgen_parse_address (cd, strp, OPENRISC_OPERAND_ABS_26, 0, NULL, & value);
191 fields->f_abs26 = value;
194 case OPENRISC_OPERAND_DISP_26 :
197 errmsg = cgen_parse_address (cd, strp, OPENRISC_OPERAND_DISP_26, 0, NULL, & value);
198 fields->f_disp26 = value;
201 case OPENRISC_OPERAND_HI16 :
202 errmsg = parse_hi16 (cd, strp, OPENRISC_OPERAND_HI16, &fields->f_simm16);
204 case OPENRISC_OPERAND_LO16 :
205 errmsg = parse_lo16 (cd, strp, OPENRISC_OPERAND_LO16, &fields->f_lo16);
207 case OPENRISC_OPERAND_OP_F_23 :
208 errmsg = cgen_parse_unsigned_integer (cd, strp, OPENRISC_OPERAND_OP_F_23, &fields->f_op4);
210 case OPENRISC_OPERAND_OP_F_3 :
211 errmsg = cgen_parse_unsigned_integer (cd, strp, OPENRISC_OPERAND_OP_F_3, &fields->f_op5);
213 case OPENRISC_OPERAND_RA :
214 errmsg = cgen_parse_keyword (cd, strp, & openrisc_cgen_opval_h_gr, & fields->f_r2);
216 case OPENRISC_OPERAND_RB :
217 errmsg = cgen_parse_keyword (cd, strp, & openrisc_cgen_opval_h_gr, & fields->f_r3);
219 case OPENRISC_OPERAND_RD :
220 errmsg = cgen_parse_keyword (cd, strp, & openrisc_cgen_opval_h_gr, & fields->f_r1);
222 case OPENRISC_OPERAND_SIMM_16 :
223 errmsg = cgen_parse_signed_integer (cd, strp, OPENRISC_OPERAND_SIMM_16, &fields->f_simm16);
225 case OPENRISC_OPERAND_UI16NC :
226 errmsg = parse_lo16 (cd, strp, OPENRISC_OPERAND_UI16NC, &fields->f_i16nc);
228 case OPENRISC_OPERAND_UIMM_16 :
229 errmsg = cgen_parse_unsigned_integer (cd, strp, OPENRISC_OPERAND_UIMM_16, &fields->f_uimm16);
231 case OPENRISC_OPERAND_UIMM_5 :
232 errmsg = cgen_parse_unsigned_integer (cd, strp, OPENRISC_OPERAND_UIMM_5, &fields->f_uimm5);
236 /* xgettext:c-format */
237 fprintf (stderr, _("Unrecognized field %d while parsing.\n"), opindex);
244 cgen_parse_fn * const openrisc_cgen_parse_handlers[] =
250 openrisc_cgen_init_asm (cd)
253 openrisc_cgen_init_opcode_table (cd);
254 openrisc_cgen_init_ibld_table (cd);
255 cd->parse_handlers = & openrisc_cgen_parse_handlers[0];
256 cd->parse_operand = openrisc_cgen_parse_operand;
260 /* Default insn parser.
262 The syntax string is scanned and operands are parsed and stored in FIELDS.
263 Relocs are queued as we go via other callbacks.
265 ??? Note that this is currently an all-or-nothing parser. If we fail to
266 parse the instruction, we return 0 and the caller will start over from
267 the beginning. Backtracking will be necessary in parsing subexpressions,
268 but that can be handled there. Not handling backtracking here may get
269 expensive in the case of the m68k. Deal with later.
271 Returns NULL for success, an error message for failure.
275 parse_insn_normal (cd, insn, strp, fields)
277 const CGEN_INSN *insn;
281 /* ??? Runtime added insns not handled yet. */
282 const CGEN_SYNTAX *syntax = CGEN_INSN_SYNTAX (insn);
283 const char *str = *strp;
286 const CGEN_SYNTAX_CHAR_TYPE * syn;
287 #ifdef CGEN_MNEMONIC_OPERANDS
292 /* For now we assume the mnemonic is first (there are no leading operands).
293 We can parse it without needing to set up operand parsing.
294 GAS's input scrubber will ensure mnemonics are lowercase, but we may
295 not be called from GAS. */
296 p = CGEN_INSN_MNEMONIC (insn);
297 while (*p && tolower (*p) == tolower (*str))
301 return _("unrecognized instruction");
303 #ifndef CGEN_MNEMONIC_OPERANDS
304 if (* str && !isspace (* str))
305 return _("unrecognized instruction");
308 CGEN_INIT_PARSE (cd);
309 cgen_init_parse_operand (cd);
310 #ifdef CGEN_MNEMONIC_OPERANDS
314 /* We don't check for (*str != '\0') here because we want to parse
315 any trailing fake arguments in the syntax string. */
316 syn = CGEN_SYNTAX_STRING (syntax);
318 /* Mnemonics come first for now, ensure valid string. */
319 if (! CGEN_SYNTAX_MNEMONIC_P (* syn))
326 /* Non operand chars must match exactly. */
327 if (CGEN_SYNTAX_CHAR_P (* syn))
329 /* FIXME: While we allow for non-GAS callers above, we assume the
330 first char after the mnemonic part is a space. */
331 /* FIXME: We also take inappropriate advantage of the fact that
332 GAS's input scrubber will remove extraneous blanks. */
333 if (tolower (*str) == tolower (CGEN_SYNTAX_CHAR (* syn)))
335 #ifdef CGEN_MNEMONIC_OPERANDS
336 if (CGEN_SYNTAX_CHAR(* syn) == ' ')
344 /* Syntax char didn't match. Can't be this insn. */
345 static char msg [80];
346 /* xgettext:c-format */
347 sprintf (msg, _("syntax error (expected char `%c', found `%c')"),
348 CGEN_SYNTAX_CHAR(*syn), *str);
353 /* Ran out of input. */
354 static char msg [80];
355 /* xgettext:c-format */
356 sprintf (msg, _("syntax error (expected char `%c', found end of instruction)"),
357 CGEN_SYNTAX_CHAR(*syn));
363 /* We have an operand of some sort. */
364 errmsg = openrisc_cgen_parse_operand (cd, CGEN_SYNTAX_FIELD (*syn),
369 /* Done with this operand, continue with next one. */
373 /* If we're at the end of the syntax string, we're done. */
376 /* FIXME: For the moment we assume a valid `str' can only contain
377 blanks now. IE: We needn't try again with a longer version of
378 the insn and it is assumed that longer versions of insns appear
379 before shorter ones (eg: lsr r2,r3,1 vs lsr r2,r3). */
380 while (isspace (* str))
384 return _("junk at end of line"); /* FIXME: would like to include `str' */
389 /* We couldn't parse it. */
390 return _("unrecognized instruction");
394 This routine is called for each instruction to be assembled.
395 STR points to the insn to be assembled.
396 We assume all necessary tables have been initialized.
397 The assembled instruction, less any fixups, is stored in BUF.
398 Remember that if CGEN_INT_INSN_P then BUF is an int and thus the value
399 still needs to be converted to target byte order, otherwise BUF is an array
400 of bytes in target byte order.
401 The result is a pointer to the insn's entry in the opcode table,
402 or NULL if an error occured (an error message will have already been
405 Note that when processing (non-alias) macro-insns,
406 this function recurses.
408 ??? It's possible to make this cpu-independent.
409 One would have to deal with a few minor things.
410 At this point in time doing so would be more of a curiosity than useful
411 [for example this file isn't _that_ big], but keeping the possibility in
412 mind helps keep the design clean. */
415 openrisc_cgen_assemble_insn (cd, str, fields, buf, errmsg)
419 CGEN_INSN_BYTES_PTR buf;
423 CGEN_INSN_LIST *ilist;
424 const char *parse_errmsg = NULL;
425 const char *insert_errmsg = NULL;
427 /* Skip leading white space. */
428 while (isspace (* str))
431 /* The instructions are stored in hashed lists.
432 Get the first in the list. */
433 ilist = CGEN_ASM_LOOKUP_INSN (cd, str);
435 /* Keep looking until we find a match. */
438 for ( ; ilist != NULL ; ilist = CGEN_ASM_NEXT_INSN (ilist))
440 const CGEN_INSN *insn = ilist->insn;
442 #ifdef CGEN_VALIDATE_INSN_SUPPORTED
443 /* not usually needed as unsupported opcodes shouldn't be in the hash lists */
444 /* Is this insn supported by the selected cpu? */
445 if (! openrisc_cgen_insn_supported (cd, insn))
449 /* If the RELAX attribute is set, this is an insn that shouldn't be
450 chosen immediately. Instead, it is used during assembler/linker
451 relaxation if possible. */
452 if (CGEN_INSN_ATTR_VALUE (insn, CGEN_INSN_RELAX) != 0)
457 /* Allow parse/insert handlers to obtain length of insn. */
458 CGEN_FIELDS_BITSIZE (fields) = CGEN_INSN_BITSIZE (insn);
460 parse_errmsg = CGEN_PARSE_FN (cd, insn) (cd, insn, & str, fields);
461 if (parse_errmsg != NULL)
464 /* ??? 0 is passed for `pc' */
465 insert_errmsg = CGEN_INSERT_FN (cd, insn) (cd, insn, fields, buf,
467 if (insert_errmsg != NULL)
470 /* It is up to the caller to actually output the insn and any
476 static char errbuf[150];
477 #ifdef CGEN_VERBOSE_ASSEMBLER_ERRORS
478 const char *tmp_errmsg;
480 /* If requesting verbose error messages, use insert_errmsg.
481 Failing that, use parse_errmsg */
482 tmp_errmsg = (insert_errmsg ? insert_errmsg :
483 parse_errmsg ? parse_errmsg :
484 _("unrecognized instruction"));
486 if (strlen (start) > 50)
487 /* xgettext:c-format */
488 sprintf (errbuf, "%s `%.50s...'", tmp_errmsg, start);
490 /* xgettext:c-format */
491 sprintf (errbuf, "%s `%.50s'", tmp_errmsg, start);
493 if (strlen (start) > 50)
494 /* xgettext:c-format */
495 sprintf (errbuf, _("bad instruction `%.50s...'"), start);
497 /* xgettext:c-format */
498 sprintf (errbuf, _("bad instruction `%.50s'"), start);
506 #if 0 /* This calls back to GAS which we can't do without care. */
508 /* Record each member of OPVALS in the assembler's symbol table.
509 This lets GAS parse registers for us.
510 ??? Interesting idea but not currently used. */
512 /* Record each member of OPVALS in the assembler's symbol table.
513 FIXME: Not currently used. */
516 openrisc_cgen_asm_hash_keywords (cd, opvals)
518 CGEN_KEYWORD *opvals;
520 CGEN_KEYWORD_SEARCH search = cgen_keyword_search_init (opvals, NULL);
521 const CGEN_KEYWORD_ENTRY * ke;
523 while ((ke = cgen_keyword_search_next (& search)) != NULL)
525 #if 0 /* Unnecessary, should be done in the search routine. */
526 if (! openrisc_cgen_opval_supported (ke))
529 cgen_asm_record_register (cd, ke->name, ke->value);