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1 | /* Assembler interface for targets using CGEN. -*- C -*- |
2 | CGEN: Cpu tools GENerator | |
3 | ||
4 | THIS FILE IS MACHINE GENERATED WITH CGEN. | |
5 | - the resultant file is machine generated, cgen-asm.in isn't | |
6 | ||
7 | Copyright (C) 1996, 1997, 1998, 1999 Free Software Foundation, Inc. | |
8 | ||
9 | This file is part of the GNU Binutils and GDB, the GNU debugger. | |
10 | ||
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) | |
14 | any later version. | |
15 | ||
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. | |
20 | ||
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. */ | |
24 | ||
25 | /* ??? Eventually more and more of this stuff can go to cpu-independent files. | |
26 | Keep that in mind. */ | |
27 | ||
28 | #include "sysdep.h" | |
29 | #include <ctype.h> | |
30 | #include <stdio.h> | |
31 | #include "ansidecl.h" | |
32 | #include "bfd.h" | |
33 | #include "symcat.h" | |
34 | #include "@prefix@-desc.h" | |
35 | #include "@prefix@-opc.h" | |
36 | #include "opintl.h" | |
37 | ||
38 | #undef min | |
39 | #define min(a,b) ((a) < (b) ? (a) : (b)) | |
40 | #undef max | |
41 | #define max(a,b) ((a) > (b) ? (a) : (b)) | |
42 | ||
43 | static const char * parse_insn_normal | |
44 | PARAMS ((CGEN_CPU_DESC, const CGEN_INSN *, const char **, CGEN_FIELDS *)); | |
45 | \f | |
46 | /* -- assembler routines inserted here */ | |
47 | \f | |
48 | /* Default insn parser. | |
49 | ||
50 | The syntax string is scanned and operands are parsed and stored in FIELDS. | |
51 | Relocs are queued as we go via other callbacks. | |
52 | ||
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. | |
58 | ||
59 | Returns NULL for success, an error message for failure. | |
60 | */ | |
61 | ||
62 | static const char * | |
63 | parse_insn_normal (cd, insn, strp, fields) | |
64 | CGEN_CPU_DESC cd; | |
65 | const CGEN_INSN *insn; | |
66 | const char **strp; | |
67 | CGEN_FIELDS *fields; | |
68 | { | |
69 | /* ??? Runtime added insns not handled yet. */ | |
70 | const CGEN_SYNTAX *syntax = CGEN_INSN_SYNTAX (insn); | |
71 | const char *str = *strp; | |
72 | const char *errmsg; | |
73 | const char *p; | |
74 | const unsigned char * syn; | |
75 | #ifdef CGEN_MNEMONIC_OPERANDS | |
76 | /* FIXME: wip */ | |
77 | int past_opcode_p; | |
78 | #endif | |
79 | ||
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)) | |
86 | ++p, ++str; | |
87 | ||
88 | if (* p) | |
89 | return _("unrecognized instruction"); | |
90 | ||
91 | #ifndef CGEN_MNEMONIC_OPERANDS | |
92 | if (* str && !isspace (* str)) | |
93 | return _("unrecognized instruction"); | |
94 | #endif | |
95 | ||
96 | CGEN_INIT_PARSE (cd); | |
97 | cgen_init_parse_operand (cd); | |
98 | #ifdef CGEN_MNEMONIC_OPERANDS | |
99 | past_opcode_p = 0; | |
100 | #endif | |
101 | ||
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); | |
105 | ||
106 | /* Mnemonics come first for now, ensure valid string. */ | |
107 | if (! CGEN_SYNTAX_MNEMONIC_P (* syn)) | |
108 | abort (); | |
109 | ||
110 | ++syn; | |
111 | ||
112 | while (* syn != 0) | |
113 | { | |
114 | /* Non operand chars must match exactly. */ | |
115 | if (CGEN_SYNTAX_CHAR_P (* syn)) | |
116 | { | |
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))) | |
122 | { | |
123 | #ifdef CGEN_MNEMONIC_OPERANDS | |
124 | if (* syn == ' ') | |
125 | past_opcode_p = 1; | |
126 | #endif | |
127 | ++ syn; | |
128 | ++ str; | |
129 | } | |
130 | else | |
131 | { | |
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')"), | |
136 | *syn, *str); | |
137 | return msg; | |
138 | } | |
139 | continue; | |
140 | } | |
141 | ||
142 | /* We have an operand of some sort. */ | |
143 | errmsg = @arch@_cgen_parse_operand (cd, CGEN_SYNTAX_FIELD (*syn), | |
144 | &str, fields); | |
145 | if (errmsg) | |
146 | return errmsg; | |
147 | ||
148 | /* Done with this operand, continue with next one. */ | |
149 | ++ syn; | |
150 | } | |
151 | ||
152 | /* If we're at the end of the syntax string, we're done. */ | |
153 | if (* syn == '\0') | |
154 | { | |
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)) | |
160 | ++ str; | |
161 | ||
162 | if (* str != '\0') | |
163 | return _("junk at end of line"); /* FIXME: would like to include `str' */ | |
164 | ||
165 | return NULL; | |
166 | } | |
167 | ||
168 | /* We couldn't parse it. */ | |
169 | return _("unrecognized instruction"); | |
170 | } | |
171 | \f | |
172 | /* Main entry point. | |
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 | |
182 | printed). | |
183 | ||
184 | Note that when processing (non-alias) macro-insns, | |
185 | this function recurses. | |
186 | ||
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. */ | |
192 | ||
193 | const CGEN_INSN * | |
194 | @arch@_cgen_assemble_insn (cd, str, fields, buf, errmsg) | |
195 | CGEN_CPU_DESC cd; | |
196 | const char *str; | |
197 | CGEN_FIELDS *fields; | |
198 | CGEN_INSN_BYTES_PTR buf; | |
199 | char **errmsg; | |
200 | { | |
201 | const char *start; | |
202 | CGEN_INSN_LIST *ilist; | |
203 | const char *tmp_errmsg = NULL; | |
204 | ||
205 | /* Skip leading white space. */ | |
206 | while (isspace (* str)) | |
207 | ++ str; | |
208 | ||
209 | /* The instructions are stored in hashed lists. | |
210 | Get the first in the list. */ | |
211 | ilist = CGEN_ASM_LOOKUP_INSN (cd, str); | |
212 | ||
213 | /* Keep looking until we find a match. */ | |
214 | ||
215 | start = str; | |
216 | for ( ; ilist != NULL ; ilist = CGEN_ASM_NEXT_INSN (ilist)) | |
217 | { | |
218 | const CGEN_INSN *insn = ilist->insn; | |
219 | ||
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)) | |
224 | continue; | |
225 | #endif | |
226 | ||
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) | |
231 | continue; | |
232 | ||
233 | str = start; | |
234 | ||
235 | /* Allow parse/insert handlers to obtain length of insn. */ | |
236 | CGEN_FIELDS_BITSIZE (fields) = CGEN_INSN_BITSIZE (insn); | |
237 | ||
238 | tmp_errmsg = CGEN_PARSE_FN (cd, insn) (cd, insn, & str, fields); | |
239 | if (tmp_errmsg != NULL) | |
240 | continue; | |
241 | ||
242 | /* ??? 0 is passed for `pc' */ | |
243 | tmp_errmsg = CGEN_INSERT_FN (cd, insn) (cd, insn, fields, buf, | |
244 | (bfd_vma) 0); | |
245 | if (tmp_errmsg != NULL) | |
246 | continue; | |
247 | ||
248 | /* It is up to the caller to actually output the insn and any | |
249 | queued relocs. */ | |
250 | return insn; | |
251 | } | |
252 | ||
253 | /* Make sure we leave this with something at this point. */ | |
254 | if (tmp_errmsg == NULL) | |
255 | tmp_errmsg = "unknown mnemonic"; | |
256 | ||
257 | { | |
258 | static char errbuf[150]; | |
259 | ||
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); | |
265 | else | |
266 | /* xgettext:c-format */ | |
267 | sprintf (errbuf, "%s `%.50s'", tmp_errmsg, start); | |
268 | #else | |
269 | if (strlen (start) > 50) | |
270 | /* xgettext:c-format */ | |
271 | sprintf (errbuf, _("bad instruction `%.50s...'"), start); | |
272 | else | |
273 | /* xgettext:c-format */ | |
274 | sprintf (errbuf, _("bad instruction `%.50s'"), start); | |
275 | #endif | |
276 | ||
277 | *errmsg = errbuf; | |
278 | return NULL; | |
279 | } | |
280 | } | |
281 | \f | |
282 | #if 0 /* This calls back to GAS which we can't do without care. */ | |
283 | ||
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. */ | |
287 | ||
288 | /* Record each member of OPVALS in the assembler's symbol table. | |
289 | FIXME: Not currently used. */ | |
290 | ||
291 | void | |
292 | @arch@_cgen_asm_hash_keywords (cd, opvals) | |
293 | CGEN_CPU_DESC cd; | |
294 | CGEN_KEYWORD *opvals; | |
295 | { | |
296 | CGEN_KEYWORD_SEARCH search = cgen_keyword_search_init (opvals, NULL); | |
297 | const CGEN_KEYWORD_ENTRY * ke; | |
298 | ||
299 | while ((ke = cgen_keyword_search_next (& search)) != NULL) | |
300 | { | |
301 | #if 0 /* Unnecessary, should be done in the search routine. */ | |
302 | if (! @arch@_cgen_opval_supported (ke)) | |
303 | continue; | |
304 | #endif | |
305 | cgen_asm_record_register (cd, ke->name, ke->value); | |
306 | } | |
307 | } | |
308 | ||
309 | #endif /* 0 */ |