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, 1997, 1998, 1999 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"
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 */
48 /* Default insn parser.
50 The syntax string is scanned and operands are parsed and stored in FIELDS.
51 Relocs are queued as we go via other callbacks.
53 ??? Note that this is currently an all-or-nothing parser. If we fail to
54 parse the instruction, we return 0 and the caller will start over from
55 the beginning. Backtracking will be necessary in parsing subexpressions,
56 but that can be handled there. Not handling backtracking here may get
57 expensive in the case of the m68k. Deal with later.
59 Returns NULL for success, an error message for failure.
63 parse_insn_normal (cd, insn, strp, fields)
65 const CGEN_INSN *insn;
69 /* ??? Runtime added insns not handled yet. */
70 const CGEN_SYNTAX *syntax = CGEN_INSN_SYNTAX (insn);
71 const char *str = *strp;
74 const unsigned char * syn;
75 #ifdef CGEN_MNEMONIC_OPERANDS
80 /* For now we assume the mnemonic is first (there are no leading operands).
81 We can parse it without needing to set up operand parsing.
82 GAS's input scrubber will ensure mnemonics are lowercase, but we may
83 not be called from GAS. */
84 p = CGEN_INSN_MNEMONIC (insn);
85 while (*p && tolower (*p) == tolower (*str))
89 return _("unrecognized instruction");
91 #ifndef CGEN_MNEMONIC_OPERANDS
92 if (* str && !isspace (* str))
93 return _("unrecognized instruction");
97 cgen_init_parse_operand (cd);
98 #ifdef CGEN_MNEMONIC_OPERANDS
102 /* We don't check for (*str != '\0') here because we want to parse
103 any trailing fake arguments in the syntax string. */
104 syn = CGEN_SYNTAX_STRING (syntax);
106 /* Mnemonics come first for now, ensure valid string. */
107 if (! CGEN_SYNTAX_MNEMONIC_P (* syn))
114 /* Non operand chars must match exactly. */
115 if (CGEN_SYNTAX_CHAR_P (* syn))
117 /* FIXME: While we allow for non-GAS callers above, we assume the
118 first char after the mnemonic part is a space. */
119 /* FIXME: We also take inappropriate advantage of the fact that
120 GAS's input scrubber will remove extraneous blanks. */
121 if (tolower (*str) == tolower (CGEN_SYNTAX_CHAR (* syn)))
123 #ifdef CGEN_MNEMONIC_OPERANDS
132 /* Syntax char didn't match. Can't be this insn. */
133 static char msg [80];
134 /* xgettext:c-format */
135 sprintf (msg, _("syntax error (expected char `%c', found `%c')"),
142 /* We have an operand of some sort. */
143 errmsg = @arch@_cgen_parse_operand (cd, CGEN_SYNTAX_FIELD (*syn),
148 /* Done with this operand, continue with next one. */
152 /* If we're at the end of the syntax string, we're done. */
155 /* FIXME: For the moment we assume a valid `str' can only contain
156 blanks now. IE: We needn't try again with a longer version of
157 the insn and it is assumed that longer versions of insns appear
158 before shorter ones (eg: lsr r2,r3,1 vs lsr r2,r3). */
159 while (isspace (* str))
163 return _("junk at end of line"); /* FIXME: would like to include `str' */
168 /* We couldn't parse it. */
169 return _("unrecognized instruction");
173 This routine is called for each instruction to be assembled.
174 STR points to the insn to be assembled.
175 We assume all necessary tables have been initialized.
176 The assembled instruction, less any fixups, is stored in BUF.
177 Remember that if CGEN_INT_INSN_P then BUF is an int and thus the value
178 still needs to be converted to target byte order, otherwise BUF is an array
179 of bytes in target byte order.
180 The result is a pointer to the insn's entry in the opcode table,
181 or NULL if an error occured (an error message will have already been
184 Note that when processing (non-alias) macro-insns,
185 this function recurses.
187 ??? It's possible to make this cpu-independent.
188 One would have to deal with a few minor things.
189 At this point in time doing so would be more of a curiosity than useful
190 [for example this file isn't _that_ big], but keeping the possibility in
191 mind helps keep the design clean. */
194 @arch@_cgen_assemble_insn (cd, str, fields, buf, errmsg)
198 CGEN_INSN_BYTES_PTR buf;
202 CGEN_INSN_LIST *ilist;
203 const char *tmp_errmsg = NULL;
205 /* Skip leading white space. */
206 while (isspace (* str))
209 /* The instructions are stored in hashed lists.
210 Get the first in the list. */
211 ilist = CGEN_ASM_LOOKUP_INSN (cd, str);
213 /* Keep looking until we find a match. */
216 for ( ; ilist != NULL ; ilist = CGEN_ASM_NEXT_INSN (ilist))
218 const CGEN_INSN *insn = ilist->insn;
220 #ifdef CGEN_VALIDATE_INSN_SUPPORTED
221 /* not usually needed as unsupported opcodes shouldn't be in the hash lists */
222 /* Is this insn supported by the selected cpu? */
223 if (! @arch@_cgen_insn_supported (cd, insn))
227 /* If the RELAX attribute is set, this is an insn that shouldn't be
228 chosen immediately. Instead, it is used during assembler/linker
229 relaxation if possible. */
230 if (CGEN_INSN_ATTR_VALUE (insn, CGEN_INSN_RELAX) != 0)
235 /* Allow parse/insert handlers to obtain length of insn. */
236 CGEN_FIELDS_BITSIZE (fields) = CGEN_INSN_BITSIZE (insn);
238 tmp_errmsg = CGEN_PARSE_FN (cd, insn) (cd, insn, & str, fields);
239 if (tmp_errmsg != NULL)
242 /* ??? 0 is passed for `pc' */
243 tmp_errmsg = CGEN_INSERT_FN (cd, insn) (cd, insn, fields, buf,
245 if (tmp_errmsg != NULL)
248 /* It is up to the caller to actually output the insn and any
253 /* Make sure we leave this with something at this point. */
254 if (tmp_errmsg == NULL)
255 tmp_errmsg = "unknown mnemonic";
258 static char errbuf[150];
260 #ifdef CGEN_VERBOSE_ASSEMBLER_ERRORS
261 /* if verbose error messages, use errmsg from CGEN_PARSE_FN */
262 if (strlen (start) > 50)
263 /* xgettext:c-format */
264 sprintf (errbuf, "%s `%.50s...'", tmp_errmsg, start);
266 /* xgettext:c-format */
267 sprintf (errbuf, "%s `%.50s'", tmp_errmsg, start);
269 if (strlen (start) > 50)
270 /* xgettext:c-format */
271 sprintf (errbuf, _("bad instruction `%.50s...'"), start);
273 /* xgettext:c-format */
274 sprintf (errbuf, _("bad instruction `%.50s'"), start);
282 #if 0 /* This calls back to GAS which we can't do without care. */
284 /* Record each member of OPVALS in the assembler's symbol table.
285 This lets GAS parse registers for us.
286 ??? Interesting idea but not currently used. */
288 /* Record each member of OPVALS in the assembler's symbol table.
289 FIXME: Not currently used. */
292 @arch@_cgen_asm_hash_keywords (cd, opvals)
294 CGEN_KEYWORD *opvals;
296 CGEN_KEYWORD_SEARCH search = cgen_keyword_search_init (opvals, NULL);
297 const CGEN_KEYWORD_ENTRY * ke;
299 while ((ke = cgen_keyword_search_next (& search)) != NULL)
301 #if 0 /* Unnecessary, should be done in the search routine. */
302 if (! @arch@_cgen_opval_supported (ke))
305 cgen_asm_record_register (cd, ke->name, ke->value);