OpenCores
URL https://opencores.org/ocsvn/or1k/or1k/trunk

Subversion Repositories or1k

[/] [or1k/] [branches/] [oc/] [gdb-5.0/] [sim/] [ppc/] [gen-idecode.c] - Blame information for rev 1765

Details | Compare with Previous | View Log

Line No. Rev Author Line
1 106 markom 
/*  This file is part of the program psim.
2 
 
3 
    Copyright (C) 1994-1997, Andrew Cagney <cagney@highland.com.au>
4 
 
5 
    This program is free software; you can redistribute it and/or modify
6 
    it under the terms of the GNU General Public License as published by
7 
    the Free Software Foundation; either version 2 of the License, or
8 
    (at your option) any later version.
9 
 
10 
    This program is distributed in the hope that it will be useful,
11 
    but WITHOUT ANY WARRANTY; without even the implied warranty of
12 
    MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
13 
    GNU General Public License for more details.
14 
 
15 
    You should have received a copy of the GNU General Public License
16 
    along with this program; if not, write to the Free Software
17 
    Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA.
18 
 
19 
    */
20 
 
21 
#include "misc.h"
22 
#include "lf.h"
23 
#include "table.h"
24 
 
25 
#include "filter.h"
26 
 
27 
#include "ld-decode.h"
28 
#include "ld-cache.h"
29 
#include "ld-insn.h"
30 
 
31 
#include "igen.h"
32 
 
33 
#include "gen-idecode.h"
34 
#include "gen-icache.h"
35 
#include "gen-semantics.h"
36 
 
37 
 
38 
 
39 
static void
40 
lf_print_opcodes(lf *file,
41 
                 insn_table *table)
42 
{
43 
  if (table != NULL) {
44 
    while (1) {
45 
      ASSERT(table->opcode != NULL);
46 
      lf_printf(file, "_%d_%d",
47 
                table->opcode->first,
48 
                table->opcode->last);
49 
      if (table->parent == NULL) break;
50 
      lf_printf(file, "__%d", table->opcode_nr);
51 
      table = table->parent;
52 
    }
53 
  }
54 
}
55 
 
56 
/****************************************************************/
57 
 
58 
 
59 
static void
60 
lf_print_table_name(lf *file,
61 
                    insn_table *table)
62 
{
63 
  lf_printf(file, "idecode_table");
64 
  lf_print_opcodes(file, table);
65 
}
66 
 
67 
 
68 
 
69 
static void
70 
print_idecode_table(lf *file,
71 
                    insn_table *entry,
72 
                    const char *result)
73 
{
74 
  lf_printf(file, "/* prime the search */\n");
75 
  lf_printf(file, "idecode_table_entry *table = ");
76 
  lf_print_table_name(file, entry);
77 
  lf_printf(file, ";\n");
78 
  lf_printf(file, "int opcode = EXTRACTED32(instruction, %d, %d);\n",
79 
            i2target(hi_bit_nr, entry->opcode->first),
80 
            i2target(hi_bit_nr, entry->opcode->last));
81 
  lf_printf(file, "idecode_table_entry *table_entry = table + opcode;\n");
82 
 
83 
  lf_printf(file, "\n");
84 
  lf_printf(file, "/* iterate until a leaf */\n");
85 
  lf_printf(file, "while (1) {\n");
86 
  lf_printf(file, "  signed shift = table_entry->shift;\n");
87 
  lf_printf(file, "if (shift == function_entry) break;\n");
88 
  lf_printf(file, "  if (shift >= 0) {\n");
89 
  lf_printf(file, "    table = ((idecode_table_entry*)\n");
90 
  lf_printf(file, "             table_entry->function_or_table);\n");
91 
  lf_printf(file, "    opcode = ((instruction & table_entry->mask)\n");
92 
  lf_printf(file, "              >> shift);\n");
93 
  lf_printf(file, "    table_entry = table + opcode;\n");
94 
  lf_printf(file, "  }\n");
95 
  lf_printf(file, "  else {\n");
96 
  lf_printf(file, "    /* must be a boolean */\n");
97 
  lf_printf(file, "    ASSERT(table_entry->shift == boolean_entry);\n");
98 
  lf_printf(file, "    opcode = ((instruction & table_entry->mask)\n");
99 
  lf_printf(file, "              != table_entry->value);\n");
100 
  lf_printf(file, "    table = ((idecode_table_entry*)\n");
101 
  lf_printf(file, "             table_entry->function_or_table);\n");
102 
  lf_printf(file, "    table_entry = table + opcode;\n");
103 
  lf_printf(file, "  }\n");
104 
  lf_printf(file, "}\n");
105 
 
106 
  lf_printf(file, "\n");
107 
  lf_printf(file, "/* call the leaf code */\n");
108 
  if ((code & generate_jumps)) {
109 
    lf_printf(file, "goto *table_entry->function_or_table;\n");
110 
  }
111 
  else {
112 
    lf_printf(file, "%s ", result);
113 
    if ((code & generate_with_icache)) {
114 
      lf_printf(file, "(((idecode_icache*)table_entry->function_or_table)\n");
115 
      lf_printf(file, "  (%s));\n", ICACHE_FUNCTION_ACTUAL);
116 
    }
117 
    else {
118 
      lf_printf(file, "((idecode_semantic*)table_entry->function_or_table)\n");
119 
      lf_printf(file, "  (%s);\n", SEMANTIC_FUNCTION_ACTUAL);
120 
    }
121 
  }
122 
}
123 
 
124 
 
125 
static void
126 
print_idecode_table_start(insn_table *table,
127 
                          lf *file,
128 
                          void *data,
129 
                          int depth)
130 
{
131 
  ASSERT(depth == 0);
132 
  /* start of the table */
133 
  if (table->opcode_rule->gen == array_gen) {
134 
    lf_printf(file, "\n");
135 
    lf_printf(file, "static idecode_table_entry ");
136 
    lf_print_table_name(file, table);
137 
    lf_printf(file, "[] = {\n");
138 
  }
139 
}
140 
 
141 
static void
142 
print_idecode_table_leaf(insn_table *entry,
143 
                         lf *file,
144 
                         void *data,
145 
                         insn *instruction,
146 
                         int depth)
147 
{
148 
  ASSERT(entry->parent != NULL);
149 
  ASSERT(depth == 0);
150 
 
151 
  /* add an entry to the table */
152 
  if (entry->parent->opcode_rule->gen == array_gen) {
153 
    lf_printf(file, "  /*%d*/ { ", entry->opcode_nr);
154 
    if (entry->opcode == NULL) {
155 
      /* table leaf entry */
156 
      lf_printf(file, "function_entry, 0, 0, ");
157 
      if ((code & generate_jumps))
158 
        lf_printf(file, "&&");
159 
      print_function_name(file,
160 
                          entry->insns->file_entry->fields[insn_name],
161 
                          entry->expanded_bits,
162 
                          ((code & generate_with_icache)
163 
                           ? function_name_prefix_icache
164 
                           : function_name_prefix_semantics));
165 
    }
166 
    else if (entry->opcode_rule->gen == switch_gen
167 
             || entry->opcode_rule->gen == goto_switch_gen
168 
             || entry->opcode_rule->gen == padded_switch_gen) {
169 
      /* table calling switch statement */
170 
      lf_printf(file, "function_entry, 0, 0, ");
171 
      if ((code & generate_jumps))
172 
        lf_printf(file, "&&");
173 
      lf_print_table_name(file, entry);
174 
    }
175 
    else if (entry->opcode->is_boolean) {
176 
      /* table `calling' boolean table */
177 
      lf_printf(file, "boolean_entry, ");
178 
      lf_printf(file, "MASK32(%d, %d), ",
179 
                i2target(hi_bit_nr, entry->opcode->first),
180 
                i2target(hi_bit_nr, entry->opcode->last));
181 
      lf_printf(file, "INSERTED32(%d, %d, %d), ",
182 
                entry->opcode->boolean_constant,
183 
                i2target(hi_bit_nr, entry->opcode->first),
184 
                i2target(hi_bit_nr, entry->opcode->last));
185 
      lf_print_table_name(file, entry);
186 
    }
187 
    else {
188 
      /* table `calling' another table */
189 
      lf_printf(file, "%d, ", insn_bit_size - entry->opcode->last - 1);
190 
      lf_printf(file, "MASK32(%d,%d), ",
191 
                i2target(hi_bit_nr, entry->opcode->first),
192 
                i2target(hi_bit_nr, entry->opcode->last));
193 
      lf_printf(file, "0, ");
194 
      lf_print_table_name(file, entry);
195 
    }
196 
    lf_printf(file, " },\n");
197 
  }
198 
}
199 
 
200 
static void
201 
print_idecode_table_end(insn_table *table,
202 
                        lf *file,
203 
                        void *data,
204 
                        int depth)
205 
{
206 
  ASSERT(depth == 0);
207 
  if (table->opcode_rule->gen == array_gen) {
208 
    lf_printf(file, "};\n");
209 
  }
210 
}
211 
 
212 
static void
213 
print_idecode_table_padding(insn_table *table,
214 
                            lf *file,
215 
                            void *data,
216 
                            int depth,
217 
                            int opcode_nr)
218 
{
219 
  ASSERT(depth == 0);
220 
  if (table->opcode_rule->gen == array_gen) {
221 
    lf_printf(file, "  /*%d*/ { function_entry, 0, 0, ", opcode_nr);
222 
    if ((code & generate_jumps))
223 
      lf_printf(file, "&&");
224 
    lf_printf(file, "%s_illegal },\n",
225 
              ((code & generate_with_icache) ? "icache" : "semantic"));
226 
  }
227 
}
228 
 
229 
 
230 
/****************************************************************/
231 
 
232 
 
233 
static void
234 
print_goto_switch_name(lf *file,
235 
                       insn_table *entry)
236 
{
237 
  lf_printf(file, "case_");
238 
  if (entry->opcode == NULL)
239 
    print_function_name(file,
240 
                        entry->insns->file_entry->fields[insn_name],
241 
                        entry->expanded_bits,
242 
                        ((code & generate_with_icache)
243 
                         ? function_name_prefix_icache
244 
                         : function_name_prefix_semantics));
245 
  else
246 
    lf_print_table_name(file, entry);
247 
}
248 
 
249 
static void
250 
print_goto_switch_table_leaf(insn_table *entry,
251 
                             lf *file,
252 
                             void *data,
253 
                             insn *instruction,
254 
                             int depth)
255 
{
256 
  ASSERT(entry->parent != NULL);
257 
  ASSERT(depth == 0);
258 
  ASSERT(entry->parent->opcode_rule->gen == goto_switch_gen);
259 
  ASSERT(entry->parent->opcode);
260 
 
261 
  lf_printf(file, "&&");
262 
  print_goto_switch_name(file, entry);
263 
  lf_printf(file, ",\n");
264 
}
265 
 
266 
static void
267 
print_goto_switch_table_padding(insn_table *table,
268 
                                lf *file,
269 
                                void *data,
270 
                                int depth,
271 
                                int opcode_nr)
272 
{
273 
  ASSERT(depth == 0);
274 
  ASSERT(table->opcode_rule->gen == goto_switch_gen);
275 
 
276 
  lf_printf(file, "&&illegal_");
277 
  lf_print_table_name(file, table);
278 
  lf_printf(file, ",\n");
279 
}
280 
 
281 
static void
282 
print_goto_switch_break(lf *file,
283 
                        insn_table *entry)
284 
{
285 
  lf_printf(file, "goto break_");
286 
  lf_print_table_name(file, entry->parent);
287 
  lf_printf(file, ";\n");
288 
}
289 
 
290 
 
291 
static void
292 
print_goto_switch_table(lf *file,
293 
                        insn_table *table)
294 
{
295 
  lf_printf(file, "const static void *");
296 
  lf_print_table_name(file, table);
297 
  lf_printf(file, "[] = {\n");
298 
  lf_indent(file, +2);
299 
  insn_table_traverse_tree(table,
300 
                           file, NULL/*data*/,
301 
                           0,
302 
                           NULL/*start*/,
303 
                           print_goto_switch_table_leaf,
304 
                           NULL/*end*/,
305 
                           print_goto_switch_table_padding);
306 
  lf_indent(file, -2);
307 
  lf_printf(file, "};\n");
308 
}
309 
 
310 
 
311 
void print_idecode_switch
312 
(lf *file,
313 
 insn_table *table,
314 
 const char *result);
315 
 
316 
static void
317 
idecode_switch_start(insn_table *table,
318 
                     lf *file,
319 
                     void *data,
320 
                     int depth)
321 
{
322 
  /* const char *result = data; */
323 
  ASSERT(depth == 0);
324 
  ASSERT(table->opcode_rule->gen == switch_gen
325 
         || table->opcode_rule->gen == goto_switch_gen
326 
         || table->opcode_rule->gen == padded_switch_gen);
327 
 
328 
  if (table->opcode->is_boolean
329 
      || table->opcode_rule->gen == switch_gen
330 
         || table->opcode_rule->gen == padded_switch_gen) {
331 
    lf_printf(file, "switch (EXTRACTED32(instruction, %d, %d)) {\n",
332 
              i2target(hi_bit_nr, table->opcode->first),
333 
              i2target(hi_bit_nr, table->opcode->last));
334 
  }
335 
  else if (table->opcode_rule->gen == goto_switch_gen) {
336 
    if (table->parent != NULL
337 
        && (table->parent->opcode_rule->gen == switch_gen
338 
            || table->parent->opcode_rule->gen == goto_switch_gen
339 
            || table->parent->opcode_rule->gen == padded_switch_gen)) {
340 
      lf_printf(file, "{\n");
341 
      lf_indent(file, +2);
342 
    }
343 
    print_goto_switch_table(file, table);
344 
    lf_printf(file, "ASSERT(EXTRACTED32(instruction, %d, %d)\n",
345 
              i2target(hi_bit_nr, table->opcode->first),
346 
              i2target(hi_bit_nr, table->opcode->last));
347 
    lf_printf(file, "       < (sizeof(");
348 
    lf_print_table_name(file, table);
349 
    lf_printf(file, ") / sizeof(void*)));\n");
350 
    lf_printf(file, "goto *");
351 
    lf_print_table_name(file, table);
352 
    lf_printf(file, "[EXTRACTED32(instruction, %d, %d)];\n",
353 
              i2target(hi_bit_nr, table->opcode->first),
354 
              i2target(hi_bit_nr, table->opcode->last));
355 
  }
356 
  else {
357 
    ASSERT("bad switch" == NULL);
358 
  }
359 
}
360 
 
361 
 
362 
static void
363 
idecode_switch_leaf(insn_table *entry,
364 
                    lf *file,
365 
                    void *data,
366 
                    insn *instruction,
367 
                    int depth)
368 
{
369 
  const char *result = data;
370 
  ASSERT(entry->parent != NULL);
371 
  ASSERT(depth == 0);
372 
  ASSERT(entry->parent->opcode_rule->gen == switch_gen
373 
         || entry->parent->opcode_rule->gen == goto_switch_gen
374 
         || entry->parent->opcode_rule->gen == padded_switch_gen);
375 
  ASSERT(entry->parent->opcode);
376 
 
377 
  if (entry->parent->opcode->is_boolean
378 
      && entry->opcode_nr == 0) {
379 
    /* boolean false target */
380 
    lf_printf(file, "case %d:\n", entry->parent->opcode->boolean_constant);
381 
  }
382 
  else if (entry->parent->opcode->is_boolean
383 
           && entry->opcode_nr != 0) {
384 
    /* boolean true case */
385 
    lf_printf(file, "default:\n");
386 
  }
387 
  else if (entry->parent->opcode_rule->gen == switch_gen
388 
           || entry->parent->opcode_rule->gen == padded_switch_gen) {
389 
    /* normal goto */
390 
    lf_printf(file, "case %d:\n", entry->opcode_nr);
391 
  }
392 
  else if (entry->parent->opcode_rule->gen == goto_switch_gen) {
393 
    /* lf_indent(file, -1); */
394 
    print_goto_switch_name(file, entry);
395 
    lf_printf(file, ":\n");
396 
    /* lf_indent(file, +1); */
397 
  }
398 
  else {
399 
    ASSERT("bad switch" == NULL);
400 
  }
401 
  lf_indent(file, +2);
402 
  {
403 
    if (entry->opcode == NULL) {
404 
      /* switch calling leaf */
405 
      if ((code & generate_jumps))
406 
        lf_printf(file, "goto ");
407 
      if ((code & generate_calls))
408 
        lf_printf(file, "%s ", result);
409 
      print_function_name(file,
410 
                          entry->insns->file_entry->fields[insn_name],
411 
                          entry->expanded_bits,
412 
                          ((code & generate_with_icache)
413 
                           ? function_name_prefix_icache
414 
                           : function_name_prefix_semantics));
415 
      if ((code & generate_calls))
416 
        lf_printf(file, "(%s)", SEMANTIC_FUNCTION_ACTUAL);
417 
      lf_printf(file, ";\n");
418 
    }
419 
    else if (entry->opcode_rule->gen == switch_gen
420 
             || entry->opcode_rule->gen == goto_switch_gen
421 
             || entry->opcode_rule->gen == padded_switch_gen) {
422 
      /* switch calling switch */
423 
      print_idecode_switch(file, entry, result);
424 
    }
425 
    else {
426 
      /* switch looking up a table */
427 
      lf_printf(file, "{\n");
428 
      lf_indent(file, -2);
429 
      print_idecode_table(file, entry, result);
430 
      lf_indent(file, -2);
431 
      lf_printf(file, "}\n");
432 
    }
433 
    if (entry->parent->opcode->is_boolean
434 
        || entry->parent->opcode_rule->gen == switch_gen
435 
        || entry->parent->opcode_rule->gen == padded_switch_gen) {
436 
      lf_printf(file, "break;\n");
437 
    }
438 
    else if (entry->parent->opcode_rule->gen == goto_switch_gen) {
439 
      print_goto_switch_break(file, entry);
440 
    }
441 
    else {
442 
      ASSERT("bad switch" == NULL);
443 
    }
444 
  }
445 
  lf_indent(file, -2);
446 
}
447 
 
448 
 
449 
static void
450 
print_idecode_switch_illegal(lf *file,
451 
                             const char *result)
452 
{
453 
  lf_indent(file, +2);
454 
  print_idecode_illegal(file, result);
455 
  lf_printf(file, "break;\n");
456 
  lf_indent(file, -2);
457 
}
458 
 
459 
static void
460 
idecode_switch_end(insn_table *table,
461 
                   lf *file,
462 
                   void *data,
463 
                   int depth)
464 
{
465 
  const char *result = data;
466 
  ASSERT(depth == 0);
467 
  ASSERT(table->opcode_rule->gen == switch_gen
468 
         || table->opcode_rule->gen == goto_switch_gen
469 
         || table->opcode_rule->gen == padded_switch_gen);
470 
  ASSERT(table->opcode);
471 
 
472 
  if (table->opcode->is_boolean) {
473 
    lf_printf(file, "}\n");
474 
  }
475 
  else if (table->opcode_rule->gen == switch_gen
476 
           || table->opcode_rule->gen == padded_switch_gen) {
477 
    lf_printf(file, "default:\n");
478 
    switch (table->opcode_rule->gen) {
479 
    case switch_gen:
480 
      print_idecode_switch_illegal(file, result);
481 
      break;
482 
    case padded_switch_gen:
483 
      lf_printf(file, "  error(\"Internal error - bad switch generated\\n\");\n");
484 
      lf_printf(file, "  break;\n");
485 
      break;
486 
    default:
487 
      ASSERT("bad switch" == NULL);
488 
    }
489 
    lf_printf(file, "}\n");
490 
  }
491 
  else if (table->opcode_rule->gen == goto_switch_gen) {
492 
    lf_printf(file, "illegal_");
493 
    lf_print_table_name(file, table);
494 
    lf_printf(file, ":\n");
495 
    print_idecode_illegal(file, result);
496 
    lf_printf(file, "break_");
497 
    lf_print_table_name(file, table);
498 
    lf_printf(file, ":;\n");
499 
    if (table->parent != NULL
500 
        && (table->parent->opcode_rule->gen == switch_gen
501 
            || table->parent->opcode_rule->gen == goto_switch_gen
502 
            || table->parent->opcode_rule->gen == padded_switch_gen)) {
503 
      lf_indent(file, -2);
504 
      lf_printf(file, "}\n");
505 
    }
506 
  }
507 
  else {
508 
    ASSERT("bad switch" == NULL);
509 
  }
510 
}
511 
 
512 
static void
513 
idecode_switch_padding(insn_table *table,
514 
                       lf *file,
515 
                       void *data,
516 
                       int depth,
517 
                       int opcode_nr)
518 
{
519 
  const char *result = data;
520 
  ASSERT(depth == 0);
521 
  ASSERT(table->opcode_rule->gen == switch_gen
522 
         || table->opcode_rule->gen == goto_switch_gen
523 
         || table->opcode_rule->gen == padded_switch_gen);
524 
 
525 
  switch (table->opcode_rule->gen) {
526 
  case switch_gen:
527 
    break;
528 
  case padded_switch_gen:
529 
    lf_printf(file, "case %d:\n", opcode_nr);
530 
    print_idecode_switch_illegal(file, result);
531 
    break;
532 
  case goto_switch_gen:
533 
    /* no padding needed */
534 
    break;
535 
  default:
536 
    ASSERT("bad switch" != NULL);
537 
  }
538 
}
539 
 
540 
 
541 
void
542 
print_idecode_switch(lf *file,
543 
                     insn_table *table,
544 
                     const char *result)
545 
{
546 
  insn_table_traverse_tree(table,
547 
                           file, (void*)result,
548 
                           0,
549 
                           idecode_switch_start,
550 
                           idecode_switch_leaf,
551 
                           idecode_switch_end,
552 
                           idecode_switch_padding);
553 
}
554 
 
555 
 
556 
static void
557 
print_idecode_switch_function_header(lf *file,
558 
                                     insn_table *table,
559 
                                     int is_function_definition)
560 
{
561 
  lf_printf(file, "\n");
562 
  if ((code & generate_calls)) {
563 
    lf_printf(file, "static ");
564 
    if ((code & generate_with_icache))
565 
      lf_printf(file, "idecode_semantic *");
566 
    else
567 
      lf_printf(file, "unsigned_word");
568 
    if (is_function_definition)
569 
      lf_printf(file, "\n");
570 
    else
571 
      lf_printf(file, " ");
572 
    lf_print_table_name(file, table);
573 
    lf_printf(file, "\n(%s)", ICACHE_FUNCTION_FORMAL);
574 
    if (!is_function_definition)
575 
      lf_printf(file, ";");
576 
    lf_printf(file, "\n");
577 
  }
578 
  if ((code & generate_jumps) && is_function_definition) {
579 
    lf_indent(file, -1);
580 
    lf_print_table_name(file, table);
581 
    lf_printf(file, ":\n");
582 
    lf_indent(file, +1);
583 
  }
584 
}
585 
 
586 
 
587 
static void
588 
idecode_declare_if_switch(insn_table *table,
589 
                          lf *file,
590 
                          void *data,
591 
                          int depth)
592 
{
593 
  if ((table->opcode_rule->gen == switch_gen
594 
       || table->opcode_rule->gen == goto_switch_gen
595 
       || table->opcode_rule->gen == padded_switch_gen)
596 
      && table->parent != NULL /* don't declare the top one yet */
597 
      && table->parent->opcode_rule->gen == array_gen) {
598 
    print_idecode_switch_function_header(file,
599 
                                         table,
600 
                                         0/*isnt function definition*/);
601 
  }
602 
}
603 
 
604 
 
605 
static void
606 
idecode_expand_if_switch(insn_table *table,
607 
                         lf *file,
608 
                         void *data,
609 
                         int depth)
610 
{
611 
  if ((table->opcode_rule->gen == switch_gen
612 
       || table->opcode_rule->gen == goto_switch_gen
613 
       || table->opcode_rule->gen == padded_switch_gen)
614 
      && table->parent != NULL /* don't expand the top one yet */
615 
      && table->parent->opcode_rule->gen == array_gen) {
616 
    print_idecode_switch_function_header(file,
617 
                                            table,
618 
                                            1/*is function definition*/);
619 
    if ((code & generate_calls)) {
620 
      lf_printf(file, "{\n");
621 
      lf_indent(file, +2);
622 
    }
623 
    print_idecode_switch(file, table, "return");
624 
    if ((code & generate_calls)) {
625 
      lf_indent(file, -2);
626 
      lf_printf(file, "}\n");
627 
    }
628 
  }
629 
}
630 
 
631 
 
632 
/****************************************************************/
633 
 
634 
 
635 
static void
636 
print_idecode_lookups(lf *file,
637 
                      insn_table *table,
638 
                      cache_table *cache_rules)
639 
{
640 
  int depth;
641 
 
642 
  /* output switch function declarations where needed by tables */
643 
  insn_table_traverse_tree(table,
644 
                           file, NULL,
645 
                           1,
646 
                           idecode_declare_if_switch, /* START */
647 
                           NULL, NULL, NULL);
648 
 
649 
  /* output tables where needed */
650 
  for (depth = insn_table_depth(table);
651 
       depth > 0;
652 
       depth--) {
653 
    insn_table_traverse_tree(table,
654 
                             file, NULL,
655 
                             1-depth,
656 
                             print_idecode_table_start,
657 
                             print_idecode_table_leaf,
658 
                             print_idecode_table_end,
659 
                             print_idecode_table_padding);
660 
  }
661 
 
662 
  /* output switch functions where needed */
663 
  insn_table_traverse_tree(table,
664 
                           file, NULL,
665 
                           1,
666 
                           idecode_expand_if_switch, /* START */
667 
                           NULL, NULL, NULL);
668 
}
669 
 
670 
 
671 
static void
672 
print_idecode_body(lf *file,
673 
                   insn_table *table,
674 
                   const char *result)
675 
{
676 
  if (table->opcode_rule->gen == switch_gen
677 
      || table->opcode_rule->gen == goto_switch_gen
678 
      || table->opcode_rule->gen == padded_switch_gen)
679 
    print_idecode_switch(file, table, result);
680 
  else
681 
    print_idecode_table(file, table, result);
682 
}
683 
 
684 
 
685 
/****************************************************************/
686 
 
687 
 
688 
static void
689 
print_run_until_stop_body(lf *file,
690 
                          insn_table *table,
691 
                          int can_stop)
692 
{
693 
  /* Output the function to execute real code:
694 
 
695 
     Unfortunatly, there are multiple cases to consider vis:
696 
 
697 
     <icache> X <smp> X <events> X <keep-running-flag> X ...
698 
 
699 
     Consequently this function is written in multiple different ways */
700 
 
701 
  lf_putstr(file, "{\n");
702 
  lf_indent(file, +2);
703 
  lf_putstr(file, "jmp_buf halt;\n");
704 
  lf_putstr(file, "jmp_buf restart;\n");
705 
  if (!generate_smp) {
706 
    lf_putstr(file, "cpu *processor = NULL;\n");
707 
    lf_putstr(file, "unsigned_word cia = -1;\n");
708 
  }
709 
  lf_putstr(file, "int last_cpu;\n");
710 
  if (generate_smp) {
711 
    lf_putstr(file, "int current_cpu;\n");
712 
  }
713 
 
714 
  if ((code & generate_with_icache)) {
715 
    lf_putstr(file, "int cpu_nr;\n");
716 
    lf_putstr(file, "\n");
717 
    lf_putstr(file, "/* flush the icache of a possible break insn */\n");
718 
    lf_putstr(file, "for (cpu_nr = 0; cpu_nr < nr_cpus; cpu_nr++)\n");
719 
    lf_putstr(file, "  cpu_flush_icache(processors[cpu_nr]);\n");
720 
  }
721 
 
722 
  lf_putstr(file, "\n");
723 
  lf_putstr(file, "/* set the halt target initially */\n");
724 
  lf_putstr(file, "psim_set_halt_and_restart(system, &halt, NULL);\n");
725 
  lf_putstr(file, "if (setjmp(halt))\n");
726 
  lf_putstr(file, "  return;\n");
727 
 
728 
  lf_putstr(file, "\n");
729 
  lf_putstr(file, "/* where were we before the halt? */\n");
730 
  lf_putstr(file, "last_cpu = psim_last_cpu(system);\n");
731 
 
732 
  lf_putstr(file, "\n");
733 
  lf_putstr(file, "/* check for need to force event processing first */\n");
734 
  lf_putstr(file, "if (WITH_EVENTS) {\n");
735 
  lf_putstr(file, "  if (last_cpu == nr_cpus) {\n");
736 
  lf_putstr(file, "    /* halted during event processing */\n");
737 
  lf_putstr(file, "    event_queue_process(events);\n");
738 
  lf_putstr(file, "    last_cpu = -1;\n");
739 
  lf_putstr(file, "  }\n");
740 
  lf_putstr(file, "  else if (last_cpu == nr_cpus - 1) {\n");
741 
  lf_putstr(file, "    /* last cpu did halt */\n");
742 
  lf_putstr(file, "    if (event_queue_tick(events)) {\n");
743 
  lf_putstr(file, "      event_queue_process(events);\n");
744 
  lf_putstr(file, "    }\n");
745 
  lf_putstr(file, "    last_cpu = -1;\n");
746 
  lf_putstr(file, "  }\n");
747 
  lf_putstr(file, "}\n");
748 
  lf_putstr(file, "else {\n");
749 
  lf_putstr(file, " if (last_cpu == nr_cpus - 1)\n");
750 
  lf_putstr(file, "   /* cpu zero is next */\n");
751 
  lf_putstr(file, "   last_cpu = -1;\n");
752 
  lf_putstr(file, "}\n");
753 
 
754 
  lf_putstr(file, "\n");
755 
  lf_putstr(file, "/* have ensured that the event queue can not be first */\n");
756 
  lf_putstr(file, "ASSERT(last_cpu >= -1 && last_cpu < nr_cpus - 1);\n");
757 
 
758 
  if (!generate_smp) {
759 
 
760 
    lf_putstr(file, "
761 
/* CASE 1: NO SMP (with or with out instruction cache).
762 
 
763 
   In this case, we can take advantage of the fact that the current
764 
   instruction address does not need to be returned to the cpu object
765 
   after every execution of an instruction.  Instead it only needs to
766 
   be saved when either A. the main loop exits or B. A cpu-halt or
767 
   cpu-restart call forces the loop to be re-enered.  The later
768 
   functions always save the current cpu instruction address.
769 
 
770 
   Two subcases also exist that with and that without an instruction
771 
   cache.
772 
 
773 
   An additional complexity is the need to ensure that a 1:1 ratio
774 
   is maintained between the execution of an instruction and the
775 
   incrementing of the simulation clock */");
776 
 
777 
    lf_putstr(file, "\n");
778 
 
779 
    lf_putstr(file, "\n");
780 
    lf_putstr(file, "/* now add restart target as ready to run */\n");
781 
    lf_putstr(file, "psim_set_halt_and_restart(system, &halt, &restart);\n");
782 
    lf_putstr(file, "if (setjmp(restart)) {\n");
783 
    lf_putstr(file, "  if (WITH_EVENTS) {\n");
784 
    lf_putstr(file, "    /* when restart, cpu must have been last, clock next */\n");
785 
    lf_putstr(file, "    if (event_queue_tick(events)) {\n");
786 
    lf_putstr(file, "      event_queue_process(events);\n");
787 
    lf_putstr(file, "    }\n");
788 
    lf_putstr(file, "  }\n");
789 
    lf_putstr(file, "}\n");
790 
 
791 
    lf_putstr(file, "\n");
792 
    lf_putstr(file, "/* prime the main loop */\n");
793 
    lf_putstr(file, "processor = processors[0];\n");
794 
    lf_putstr(file, "cia = cpu_get_program_counter(processor);\n");
795 
 
796 
    lf_putstr(file, "\n");
797 
    lf_putstr(file, "while (1) {\n");
798 
    lf_indent(file, +2);
799 
 
800 
    if (!(code & generate_with_icache)) {
801 
      lf_putstr(file, "instruction_word instruction =\n");
802 
      lf_putstr(file, "  vm_instruction_map_read(cpu_instruction_map(processor), processor, cia);\n");
803 
      lf_putstr(file, "\n");
804 
      print_idecode_body(file, table, "cia =");;
805 
    }
806 
 
807 
    if ((code & generate_with_icache)) {
808 
      lf_putstr(file, "idecode_cache *cache_entry =\n");
809 
      lf_putstr(file, "  cpu_icache_entry(processor, cia);\n");
810 
      lf_putstr(file, "if (cache_entry->address == cia) {\n");
811 
      lf_putstr(file, "  /* cache hit */\n");
812 
      lf_putstr(file, "  idecode_semantic *const semantic = cache_entry->semantic;\n");
813 
      lf_putstr(file, "  cia = semantic(processor, cache_entry, cia);\n");
814 
      /* tail */
815 
      if (can_stop) {
816 
        lf_putstr(file, "if (keep_running != NULL && !*keep_running)\n");
817 
        lf_putstr(file, "  cpu_halt(processor, cia, was_continuing, 0/*ignore*/);\n");
818 
      }
819 
      lf_putstr(file, "}\n");
820 
      lf_putstr(file, "else {\n");
821 
      lf_putstr(file, "  /* cache miss */\n");
822 
      if (!(code & generate_with_semantic_icache)) {
823 
        lf_indent(file, +2);
824 
        lf_putstr(file, "idecode_semantic *semantic;\n");
825 
        lf_indent(file, -2);
826 
      }
827 
      lf_putstr(file, "  instruction_word instruction =\n");
828 
      lf_putstr(file, "    vm_instruction_map_read(cpu_instruction_map(processor), processor, cia);\n");
829 
      lf_putstr(file, "  if (WITH_MON != 0)\n");
830 
      lf_putstr(file, "    mon_event(mon_event_icache_miss, processor, cia);\n");
831 
      if ((code & generate_with_semantic_icache)) {
832 
        lf_putstr(file, "{\n");
833 
        lf_indent(file, +2);
834 
        print_idecode_body(file, table, "cia =");
835 
        lf_indent(file, -2);
836 
        lf_putstr(file, "}\n");
837 
      }
838 
      else {
839 
        print_idecode_body(file, table, "semantic =");
840 
        lf_putstr(file, "  cia = semantic(processor, cache_entry, cia);\n");
841 
      }
842 
      lf_putstr(file, "}\n");
843 
    }
844 
 
845 
    /* events */
846 
    lf_putstr(file, "\n");
847 
    lf_putstr(file, "/* process any events */\n");
848 
    lf_putstr(file, "if (WITH_EVENTS) {\n");
849 
    lf_putstr(file, "  if (event_queue_tick(events)) {\n");
850 
    lf_putstr(file, "    cpu_set_program_counter(processor, cia);\n");
851 
    lf_putstr(file, "    event_queue_process(events);\n");
852 
    lf_putstr(file, "    cia = cpu_get_program_counter(processor);\n");
853 
    lf_putstr(file, "  }\n");
854 
    lf_putstr(file, "}\n");
855 
 
856 
    /* tail */
857 
    if (can_stop) {
858 
      lf_putstr(file, "\n");
859 
      lf_putstr(file, "/* abort if necessary */\n");
860 
      lf_putstr(file, "if (keep_running != NULL && !*keep_running)\n");
861 
      lf_putstr(file, "  cpu_halt(processor, cia, was_continuing, 0/*not important*/);\n");
862 
    }
863 
 
864 
    lf_indent(file, -2);
865 
    lf_putstr(file, "}\n");
866 
  }
867 
 
868 
  if (generate_smp) {
869 
 
870 
    lf_putstr(file, "
871 
/* CASE 2: SMP (With or without ICACHE)
872 
 
873 
   The complexity here comes from needing to correctly restart the
874 
   system when it is aborted.  In particular if cpu0 requests a
875 
   restart, the next cpu is still cpu1.  Cpu0 being restarted after
876 
   all the other CPU's and the event queue have been processed */");
877 
 
878 
    lf_putstr(file, "\n");
879 
 
880 
    lf_putstr(file, "\n");
881 
    lf_putstr(file, "/* now establish the restart target */\n");
882 
    lf_putstr(file, "psim_set_halt_and_restart(system, &halt, &restart);\n");
883 
    lf_putstr(file, "if (setjmp(restart)) {\n");
884 
    lf_putstr(file, "  current_cpu = psim_last_cpu(system);\n");
885 
    lf_putstr(file, "  ASSERT(current_cpu >= 0 && current_cpu < nr_cpus);\n");
886 
    lf_putstr(file, "}\n");
887 
    lf_putstr(file, "else {\n");
888 
    lf_putstr(file, "  current_cpu = last_cpu;\n");
889 
    lf_putstr(file, "  ASSERT(current_cpu >= -1 && current_cpu < nr_cpus);\n");
890 
    lf_putstr(file, "}\n");
891 
 
892 
 
893 
    lf_putstr(file, "\n");
894 
    lf_putstr(file, "while (1) {\n");
895 
    lf_indent(file, +2);
896 
 
897 
    lf_putstr(file, "\n");
898 
    lf_putstr(file, "if (WITH_EVENTS) {\n");
899 
    lf_putstr(file, "  current_cpu += 1;\n");
900 
    lf_putstr(file, "  if (current_cpu == nr_cpus) {\n");
901 
    lf_putstr(file, "    if (event_queue_tick(events)) {\n");
902 
    lf_putstr(file, "      event_queue_process(events);\n");
903 
    lf_putstr(file, "    }\n");
904 
    lf_putstr(file, "    current_cpu = 0;\n");
905 
    lf_putstr(file, "  }\n");
906 
    lf_putstr(file, "}\n");
907 
    lf_putstr(file, "else {\n");
908 
    lf_putstr(file, "  current_cpu = (current_cpu + 1) % nr_cpus;\n");
909 
    lf_putstr(file, "}\n");
910 
 
911 
    lf_putstr(file, "\n");
912 
    lf_putstr(file, "{\n");
913 
    lf_indent(file, +2);
914 
    lf_putstr(file, "cpu *processor = processors[current_cpu];\n");
915 
    lf_putstr(file, "unsigned_word cia =\n");
916 
    lf_putstr(file, "  cpu_get_program_counter(processor);\n");
917 
 
918 
    if (!(code & generate_with_icache)) {
919 
      lf_putstr(file, "instruction_word instruction =\n");
920 
      lf_putstr(file, "  vm_instruction_map_read(cpu_instruction_map(processor), processor, cia);\n");
921 
      print_idecode_body(file, table, "cia =");
922 
      if (can_stop) {
923 
        lf_putstr(file, "if (keep_running != NULL && !*keep_running)\n");
924 
        lf_putstr(file, "  cpu_halt(processor, cia, was_continuing, 0/*ignore*/);\n");
925 
      }
926 
      lf_putstr(file, "cpu_set_program_counter(processor, cia);\n");
927 
    }
928 
 
929 
    if ((code & generate_with_icache)) {
930 
      lf_putstr(file, "idecode_cache *cache_entry =\n");
931 
      lf_putstr(file, "  cpu_icache_entry(processor, cia);\n");
932 
      lf_putstr(file, "\n");
933 
      lf_putstr(file, "if (cache_entry->address == cia) {\n");
934 
      {
935 
        lf_indent(file, +2);
936 
        lf_putstr(file, "\n");
937 
        lf_putstr(file, "/* cache hit */\n");
938 
        lf_putstr(file, "idecode_semantic *semantic = cache_entry->semantic;\n");
939 
        lf_putstr(file, "cia = semantic(processor, cache_entry, cia);\n");
940 
        /* tail */
941 
        if (can_stop) {
942 
          lf_putstr(file, "if (keep_running != NULL && !*keep_running)\n");
943 
          lf_putstr(file, "  cpu_halt(processor, cia, was_continuing, 0/*ignore-signal*/);\n");
944 
        }
945 
        lf_putstr(file, "cpu_set_program_counter(processor, cia);\n");
946 
        lf_putstr(file, "\n");
947 
        lf_indent(file, -2);
948 
      }
949 
      lf_putstr(file, "}\n");
950 
      lf_putstr(file, "else {\n");
951 
      {
952 
        lf_indent(file, +2);
953 
        lf_putstr(file, "\n");
954 
        lf_putstr(file, "/* cache miss */\n");
955 
        if (!(code & generate_with_semantic_icache)) {
956 
          lf_putstr(file, "idecode_semantic *semantic;\n");
957 
        }
958 
        lf_putstr(file, "instruction_word instruction =\n");
959 
        lf_putstr(file, "  vm_instruction_map_read(cpu_instruction_map(processor), processor, cia);\n");
960 
        lf_putstr(file, "if (WITH_MON != 0)\n");
961 
        lf_putstr(file, "  mon_event(mon_event_icache_miss, processors[current_cpu], cia);\n");
962 
        if ((code & generate_with_semantic_icache)) {
963 
          lf_putstr(file, "{\n");
964 
          lf_indent(file, +2);
965 
          print_idecode_body(file, table, "cia =");
966 
          lf_indent(file, -2);
967 
          lf_putstr(file, "}\n");
968 
        }
969 
        else {
970 
          print_idecode_body(file, table, "semantic = ");
971 
          lf_putstr(file, "cia = semantic(processor, cache_entry, cia);\n");
972 
        }
973 
        /* tail */
974 
        if (can_stop) {
975 
          lf_putstr(file, "if (keep_running != NULL && !*keep_running)\n");
976 
          lf_putstr(file, "  cpu_halt(processor, cia, was_continuing, 0/*ignore-signal*/);\n");
977 
        }
978 
        lf_putstr(file, "cpu_set_program_counter(processor, cia);\n");
979 
        lf_putstr(file, "\n");
980 
        lf_indent(file, -2);
981 
      }
982 
      lf_putstr(file, "}\n");
983 
    }
984 
 
985 
    /* close */
986 
    lf_indent(file, -2);
987 
    lf_putstr(file, "}\n");
988 
 
989 
    /* tail */
990 
    lf_indent(file, -2);
991 
    lf_putstr(file, "}\n");
992 
  }
993 
 
994 
 
995 
  lf_indent(file, -2);
996 
  lf_putstr(file, "}\n");
997 
}
998 
 
999 
 
1000 
/****************************************************************/
1001 
 
1002 
static void
1003 
print_jump(lf *file,
1004 
           int is_tail)
1005 
{
1006 
  if (is_tail) {
1007 
    lf_putstr(file, "if (keep_running != NULL && !*keep_running)\n");
1008 
    lf_putstr(file, "  cpu_halt(processor, nia, was_continuing, 0/*na*/);\n");
1009 
  }
1010 
 
1011 
  if (!generate_smp) {
1012 
    lf_putstr(file, "if (WITH_EVENTS) {\n");
1013 
    lf_putstr(file, "  if (event_queue_tick(events)) {\n");
1014 
    lf_putstr(file, "    cpu_set_program_counter(processor, nia);\n");
1015 
    lf_putstr(file, "    event_queue_process(events);\n");
1016 
    lf_putstr(file, "    nia = cpu_get_program_counter(processor);\n");
1017 
    lf_putstr(file, "  }\n");
1018 
    lf_putstr(file, "}\n");
1019 
  }
1020 
 
1021 
  if (generate_smp) {
1022 
    if (is_tail)
1023 
      lf_putstr(file, "cpu_set_program_counter(processor, nia);\n");
1024 
    lf_putstr(file, "if (WITH_EVENTS) {\n");
1025 
    lf_putstr(file, "  current_cpu += 1;\n");
1026 
    lf_putstr(file, "  if (current_cpu >= nr_cpus) {\n");
1027 
    lf_putstr(file, "    if (event_queue_tick(events)) {\n");
1028 
    lf_putstr(file, "      event_queue_process(events);\n");
1029 
    lf_putstr(file, "    }\n");
1030 
    lf_putstr(file, "    current_cpu = 0;\n");
1031 
    lf_putstr(file, "  }\n");
1032 
    lf_putstr(file, "}\n");
1033 
    lf_putstr(file, "else {\n");
1034 
    lf_putstr(file, "  current_cpu = (current_cpu + 1) % nr_cpus;\n");
1035 
    lf_putstr(file, "}\n");
1036 
    lf_putstr(file, "processor = processors[current_cpu];\n");
1037 
    lf_putstr(file, "nia = cpu_get_program_counter(processor);\n");
1038 
  }
1039 
 
1040 
  if ((code & generate_with_icache)) {
1041 
    lf_putstr(file, "cache_entry = cpu_icache_entry(processor, nia);\n");
1042 
    lf_putstr(file, "if (cache_entry->address == nia) {\n");
1043 
    lf_putstr(file, "  /* cache hit */\n");
1044 
    lf_putstr(file, "  goto *cache_entry->semantic;\n");
1045 
    lf_putstr(file, "}\n");
1046 
    if (is_tail) {
1047 
      lf_putstr(file, "goto cache_miss;\n");
1048 
    }
1049 
  }
1050 
 
1051 
  if (!(code & generate_with_icache) && is_tail) {
1052 
    lf_printf(file, "goto idecode;\n");
1053 
  }
1054 
 
1055 
}
1056 
 
1057 
 
1058 
 
1059 
 
1060 
 
1061 
static void
1062 
print_jump_insn(lf *file,
1063 
                insn *instruction,
1064 
                insn_bits *expanded_bits,
1065 
                opcode_field *opcodes,
1066 
                cache_table *cache_rules)
1067 
{
1068 
 
1069 
  /* what we are for the moment */
1070 
  lf_printf(file, "\n");
1071 
  print_my_defines(file, expanded_bits, instruction->file_entry);
1072 
 
1073 
  /* output the icache entry */
1074 
  if ((code & generate_with_icache)) {
1075 
    lf_printf(file, "\n");
1076 
    lf_indent(file, -1);
1077 
    print_function_name(file,
1078 
                        instruction->file_entry->fields[insn_name],
1079 
                        expanded_bits,
1080 
                        function_name_prefix_icache);
1081 
    lf_printf(file, ":\n");
1082 
    lf_indent(file, +1);
1083 
    lf_printf(file, "{\n");
1084 
    lf_indent(file, +2);
1085 
    lf_putstr(file, "const unsigned_word cia = nia;\n");
1086 
    print_itrace(file, instruction->file_entry, 1/*putting-value-in-cache*/);
1087 
    print_idecode_validate(file, instruction, opcodes);
1088 
    lf_printf(file, "\n");
1089 
    lf_printf(file, "{\n");
1090 
    lf_indent(file, +2);
1091 
    print_icache_body(file,
1092 
                      instruction,
1093 
                      expanded_bits,
1094 
                      cache_rules,
1095 
                      0, /*use_defines*/
1096 
                      put_values_in_icache);
1097 
    lf_printf(file, "cache_entry->address = nia;\n");
1098 
    lf_printf(file, "cache_entry->semantic = &&");
1099 
    print_function_name(file,
1100 
                        instruction->file_entry->fields[insn_name],
1101 
                        expanded_bits,
1102 
                        function_name_prefix_semantics);
1103 
    lf_printf(file, ";\n");
1104 
    if ((code & generate_with_semantic_icache)) {
1105 
      print_semantic_body(file,
1106 
                          instruction,
1107 
                          expanded_bits,
1108 
                          opcodes);
1109 
      print_jump(file, 1/*is-tail*/);
1110 
    }
1111 
    else {
1112 
      lf_printf(file, "/* goto ");
1113 
      print_function_name(file,
1114 
                          instruction->file_entry->fields[insn_name],
1115 
                          expanded_bits,
1116 
                          function_name_prefix_semantics);
1117 
      lf_printf(file, "; */\n");
1118 
    }
1119 
    lf_indent(file, -2);
1120 
    lf_putstr(file, "}\n");
1121 
    lf_indent(file, -2);
1122 
    lf_printf(file, "}\n");
1123 
  }
1124 
 
1125 
  /* print the semantics */
1126 
  lf_printf(file, "\n");
1127 
  lf_indent(file, -1);
1128 
  print_function_name(file,
1129 
                      instruction->file_entry->fields[insn_name],
1130 
                      expanded_bits,
1131 
                      function_name_prefix_semantics);
1132 
  lf_printf(file, ":\n");
1133 
  lf_indent(file, +1);
1134 
  lf_printf(file, "{\n");
1135 
  lf_indent(file, +2);
1136 
  lf_putstr(file, "const unsigned_word cia = nia;\n");
1137 
  print_icache_body(file,
1138 
                    instruction,
1139 
                    expanded_bits,
1140 
                    cache_rules,
1141 
                    ((code & generate_with_direct_access)
1142 
                     ? define_variables
1143 
                     : declare_variables),
1144 
                    ((code & generate_with_icache)
1145 
                     ? get_values_from_icache
1146 
                     : do_not_use_icache));
1147 
  print_semantic_body(file,
1148 
                      instruction,
1149 
                      expanded_bits,
1150 
                      opcodes);
1151 
  if (code & generate_with_direct_access)
1152 
    print_icache_body(file,
1153 
                      instruction,
1154 
                      expanded_bits,
1155 
                      cache_rules,
1156 
                      undef_variables,
1157 
                      ((code & generate_with_icache)
1158 
                       ? get_values_from_icache
1159 
                       : do_not_use_icache));
1160 
  print_jump(file, 1/*is tail*/);
1161 
  lf_indent(file, -2);
1162 
  lf_printf(file, "}\n");
1163 
}
1164 
 
1165 
static void
1166 
print_jump_definition(insn_table *entry,
1167 
                      lf *file,
1168 
                      void *data,
1169 
                      insn *instruction,
1170 
                      int depth)
1171 
{
1172 
  cache_table *cache_rules = (cache_table*)data;
1173 
  if (generate_expanded_instructions) {
1174 
    ASSERT(entry->nr_insn == 1
1175 
           && entry->opcode == NULL
1176 
           && entry->parent != NULL
1177 
           && entry->parent->opcode != NULL);
1178 
    ASSERT(entry->nr_insn == 1
1179 
           && entry->opcode == NULL
1180 
           && entry->parent != NULL
1181 
           && entry->parent->opcode != NULL
1182 
           && entry->parent->opcode_rule != NULL);
1183 
    print_jump_insn(file,
1184 
                    entry->insns,
1185 
                    entry->expanded_bits,
1186 
                    entry->opcode,
1187 
                    cache_rules);
1188 
  }
1189 
  else {
1190 
    print_jump_insn(file,
1191 
                    instruction,
1192 
                    NULL,
1193 
                    NULL,
1194 
                    cache_rules);
1195 
  }
1196 
}
1197 
 
1198 
 
1199 
static void
1200 
print_jump_internal_function(insn_table *table,
1201 
                             lf *file,
1202 
                             void *data,
1203 
                             table_entry *function)
1204 
{
1205 
  if (it_is("internal", function->fields[insn_flags])) {
1206 
    lf_printf(file, "\n");
1207 
    table_entry_print_cpp_line_nr(file, function);
1208 
    lf_indent(file, -1);
1209 
    print_function_name(file,
1210 
                        function->fields[insn_name],
1211 
                        NULL,
1212 
                        ((code & generate_with_icache)
1213 
                         ? function_name_prefix_icache
1214 
                         : function_name_prefix_semantics));
1215 
    lf_printf(file, ":\n");
1216 
    lf_indent(file, +1);
1217 
    lf_printf(file, "{\n");
1218 
    lf_indent(file, +2);
1219 
    lf_printf(file, "const unsigned_word cia = nia;\n");
1220 
    lf_print__c_code(file, function->annex);
1221 
    lf_print__internal_reference(file);
1222 
    lf_printf(file, "error(\"Internal function must longjump\\n\");\n");
1223 
    lf_indent(file, -2);
1224 
    lf_printf(file, "}\n");
1225 
  }
1226 
}
1227 
 
1228 
static void
1229 
print_jump_until_stop_body(lf *file,
1230 
                           insn_table *table,
1231 
                           cache_table *cache_rules,
1232 
                           int can_stop)
1233 
{
1234 
  lf_printf(file, "{\n");
1235 
  lf_indent(file, +2);
1236 
  if (!can_stop)
1237 
    lf_printf(file, "int *keep_running = NULL;\n");
1238 
  lf_putstr(file, "jmp_buf halt;\n");
1239 
  lf_putstr(file, "jmp_buf restart;\n");
1240 
  lf_putstr(file, "cpu *processor = NULL;\n");
1241 
  lf_putstr(file, "unsigned_word nia = -1;\n");
1242 
  lf_putstr(file, "instruction_word instruction = 0;\n");
1243 
  if ((code & generate_with_icache)) {
1244 
    lf_putstr(file, "idecode_cache *cache_entry = NULL;\n");
1245 
  }
1246 
  if (generate_smp) {
1247 
    lf_putstr(file, "int current_cpu = -1;\n");
1248 
  }
1249 
 
1250 
  /* all the switches and tables - they know about jumping */
1251 
  print_idecode_lookups(file, table, cache_rules);
1252 
 
1253 
  /* start the simulation up */
1254 
  if ((code & generate_with_icache)) {
1255 
    lf_putstr(file, "\n");
1256 
    lf_putstr(file, "{\n");
1257 
    lf_putstr(file, "  int cpu_nr;\n");
1258 
    lf_putstr(file, "  for (cpu_nr = 0; cpu_nr < nr_cpus; cpu_nr++)\n");
1259 
    lf_putstr(file, "    cpu_flush_icache(processors[cpu_nr]);\n");
1260 
    lf_putstr(file, "}\n");
1261 
  }
1262 
 
1263 
  lf_putstr(file, "\n");
1264 
  lf_putstr(file, "psim_set_halt_and_restart(system, &halt, &restart);\n");
1265 
 
1266 
  lf_putstr(file, "\n");
1267 
  lf_putstr(file, "if (setjmp(halt))\n");
1268 
  lf_putstr(file, "  return;\n");
1269 
 
1270 
  lf_putstr(file, "\n");
1271 
  lf_putstr(file, "setjmp(restart);\n");
1272 
 
1273 
  lf_putstr(file, "\n");
1274 
  if (!generate_smp) {
1275 
    lf_putstr(file, "processor = processors[0];\n");
1276 
    lf_putstr(file, "nia = cpu_get_program_counter(processor);\n");
1277 
  }
1278 
  else {
1279 
    lf_putstr(file, "current_cpu = psim_last_cpu(system);\n");
1280 
  }
1281 
 
1282 
  if (!(code & generate_with_icache)) {
1283 
    lf_printf(file, "\n");
1284 
    lf_indent(file, -1);
1285 
    lf_printf(file, "idecode:\n");
1286 
    lf_indent(file, +1);
1287 
  }
1288 
 
1289 
  print_jump(file, 0/*is_tail*/);
1290 
 
1291 
  if ((code & generate_with_icache)) {
1292 
    lf_indent(file, -1);
1293 
    lf_printf(file, "cache_miss:\n");
1294 
    lf_indent(file, +1);
1295 
  }
1296 
 
1297 
  lf_putstr(file, "instruction\n");
1298 
  lf_putstr(file, "  = vm_instruction_map_read(cpu_instruction_map(processor),\n");
1299 
  lf_putstr(file, "                            processor, nia);\n");
1300 
  print_idecode_body(file, table, "/*IGORE*/");
1301 
 
1302 
  /* print out a table of all the internals functions */
1303 
  insn_table_traverse_function(table,
1304 
                               file, NULL,
1305 
                               print_jump_internal_function);
1306 
 
1307 
 /* print out a table of all the instructions */
1308 
  if (generate_expanded_instructions)
1309 
    insn_table_traverse_tree(table,
1310 
                             file, cache_rules,
1311 
                             1,
1312 
                             NULL, /* start */
1313 
                             print_jump_definition, /* leaf */
1314 
                             NULL, /* end */
1315 
                             NULL); /* padding */
1316 
  else
1317 
    insn_table_traverse_insn(table,
1318 
                             file, cache_rules,
1319 
                             print_jump_definition);
1320 
  lf_indent(file, -2);
1321 
  lf_printf(file, "}\n");
1322 
}
1323 
 
1324 
 
1325 
/****************************************************************/
1326 
 
1327 
 
1328 
 
1329 
static void
1330 
print_idecode_floating_point_unavailable(lf *file)
1331 
{
1332 
  if ((code & generate_jumps))
1333 
    lf_printf(file, "goto %s_floating_point_unavailable;\n", (code & generate_with_icache) ? "icache" : "semantic");
1334 
  else if ((code & generate_with_icache))
1335 
    lf_printf(file, "return icache_floating_point_unavailable(%s);\n",
1336 
              ICACHE_FUNCTION_ACTUAL);
1337 
  else
1338 
    lf_printf(file, "return semantic_floating_point_unavailable(%s);\n",
1339 
              SEMANTIC_FUNCTION_ACTUAL);
1340 
}
1341 
 
1342 
 
1343 
/* Output code to do any final checks on the decoded instruction.
1344 
   This includes things like verifying any on decoded fields have the
1345 
   correct value and checking that (for floating point) floating point
1346 
   hardware isn't disabled */
1347 
 
1348 
void
1349 
print_idecode_validate(lf *file,
1350 
                       insn *instruction,
1351 
                       opcode_field *opcodes)
1352 
{
1353 
  /* Validate: unchecked instruction fields
1354 
 
1355 
     If any constant fields in the instruction were not checked by the
1356 
     idecode tables, output code to check that they have the correct
1357 
     value here */
1358 
  {
1359 
    unsigned check_mask = 0;
1360 
    unsigned check_val = 0;
1361 
    insn_field *field;
1362 
    opcode_field *opcode;
1363 
 
1364 
    /* form check_mask/check_val containing what needs to be checked
1365 
       in the instruction */
1366 
    for (field = instruction->fields->first;
1367 
         field->first < insn_bit_size;
1368 
         field = field->next) {
1369 
 
1370 
      check_mask <<= field->width;
1371 
      check_val <<= field->width;
1372 
 
1373 
      /* is it a constant that could need validating? */
1374 
      if (!field->is_int && !field->is_slash)
1375 
        continue;
1376 
 
1377 
      /* has it been checked by a table? */
1378 
      for (opcode = opcodes; opcode != NULL; opcode = opcode->parent) {
1379 
        if (field->first >= opcode->first
1380 
            && field->last <= opcode->last)
1381 
          break;
1382 
      }
1383 
      if (opcode != NULL)
1384 
        continue;
1385 
 
1386 
      check_mask |= (1 << field->width)-1;
1387 
      check_val |= field->val_int;
1388 
    }
1389 
 
1390 
    /* if any bits not checked by opcode tables, output code to check them */
1391 
    if (check_mask) {
1392 
      lf_printf(file, "\n");
1393 
      lf_printf(file, "/* validate: %s */\n",
1394 
                instruction->file_entry->fields[insn_format]);
1395 
      lf_printf(file, "if (WITH_RESERVED_BITS && (instruction & 0x%x) != 0x%x)\n",
1396 
                check_mask, check_val);
1397 
      lf_indent(file, +2);
1398 
      print_idecode_illegal(file, "return");
1399 
      lf_indent(file, -2);
1400 
    }
1401 
  }
1402 
 
1403 
  /* Validate floating point hardware
1404 
 
1405 
     If the simulator is being built with out floating point hardware
1406 
     (different to it being disabled in the MSR) then floating point
1407 
     instructions are invalid */
1408 
  {
1409 
    if (it_is("f", instruction->file_entry->fields[insn_flags])) {
1410 
      lf_printf(file, "\n");
1411 
      lf_printf(file, "/* Validate: FP hardware exists */\n");
1412 
      lf_printf(file, "if (CURRENT_FLOATING_POINT != HARD_FLOATING_POINT)\n");
1413 
      lf_indent(file, +2);
1414 
      print_idecode_illegal(file, "return");
1415 
      lf_indent(file, -2);
1416 
    }
1417 
  }
1418 
 
1419 
  /* Validate: Floating Point available
1420 
 
1421 
     If floating point is not available, we enter a floating point
1422 
     unavailable interrupt into the cache instead of the instruction
1423 
     proper.
1424 
 
1425 
     The PowerPC spec requires a CSI after MSR[FP] is changed and when
1426 
     ever a CSI occures we flush the instruction cache. */
1427 
 
1428 
  {
1429 
    if (it_is("f", instruction->file_entry->fields[insn_flags])) {
1430 
      lf_printf(file, "\n");
1431 
      lf_printf(file, "/* Validate: FP available according to MSR[FP] */\n");
1432 
      lf_printf(file, "if (!IS_FP_AVAILABLE(processor))\n");
1433 
      lf_indent(file, +2);
1434 
      print_idecode_floating_point_unavailable(file);
1435 
      lf_indent(file, -2);
1436 
    }
1437 
  }
1438 
}
1439 
 
1440 
 
1441 
/****************************************************************/
1442 
 
1443 
 
1444 
static void
1445 
print_idecode_run_function_header(lf *file,
1446 
                                  int can_stop,
1447 
                                  int is_definition)
1448 
{
1449 
  int indent;
1450 
  lf_printf(file, "\n");
1451 
  lf_print_function_type(file, "void", "INLINE_IDECODE", (is_definition ? " " : "\n"));
1452 
  indent = lf_putstr(file, (can_stop ? "idecode_run_until_stop" : "idecode_run"));
1453 
  if (is_definition)
1454 
    lf_putstr(file, "\n");
1455 
  else
1456 
    lf_indent(file, +indent);
1457 
  lf_putstr(file, "(psim *system,\n");
1458 
  if (can_stop)
1459 
    lf_putstr(file, " volatile int *keep_running,\n");
1460 
  lf_printf(file, " event_queue *events,\n");
1461 
  lf_putstr(file, " cpu *const processors[],\n");
1462 
  lf_putstr(file, " const int nr_cpus)");
1463 
  if (is_definition)
1464 
    lf_putstr(file, ";");
1465 
  else
1466 
    lf_indent(file, -indent);
1467 
  lf_putstr(file, "\n");
1468 
}
1469 
 
1470 
 
1471 
void
1472 
gen_idecode_h(lf *file,
1473 
              insn_table *table,
1474 
              cache_table *cache_rules)
1475 
{
1476 
  lf_printf(file, "/* The idecode_*.h functions shall move to support */\n");
1477 
  lf_printf(file, "#include \"idecode_expression.h\"\n");
1478 
  lf_printf(file, "#include \"idecode_fields.h\"\n");
1479 
  lf_printf(file, "#include \"idecode_branch.h\"\n");
1480 
  lf_printf(file, "\n");
1481 
  print_icache_struct(table, cache_rules, file);
1482 
  lf_printf(file, "\n");
1483 
  lf_printf(file, "#define WITH_IDECODE_SMP %d\n", generate_smp);
1484 
  lf_printf(file, "\n");
1485 
  print_idecode_run_function_header(file, 0/*can stop*/, 1/*is definition*/);
1486 
  print_idecode_run_function_header(file, 1/*can stop*/, 1/*is definition*/);
1487 
}
1488 
 
1489 
 
1490 
void
1491 
gen_idecode_c(lf *file,
1492 
              insn_table *table,
1493 
              cache_table *cache_rules)
1494 
{
1495 
  /* the intro */
1496 
  lf_printf(file, "#include \"inline.c\"\n");
1497 
  lf_printf(file, "\n");
1498 
  lf_printf(file, "#include \"cpu.h\"\n");
1499 
  lf_printf(file, "#include \"idecode.h\"\n");
1500 
  lf_printf(file, "#include \"semantics.h\"\n");
1501 
  lf_printf(file, "#include \"icache.h\"\n");
1502 
  lf_printf(file, "#include \"support.h\"\n");
1503 
  lf_printf(file, "\n");
1504 
  lf_printf(file, "#include <setjmp.h>\n");
1505 
  lf_printf(file, "\n");
1506 
  lf_printf(file, "enum {\n");
1507 
  lf_printf(file, "  /* greater or equal to zero => table */\n");
1508 
  lf_printf(file, "  function_entry = -1,\n");
1509 
  lf_printf(file, "  boolean_entry = -2,\n");
1510 
  lf_printf(file, "};\n");
1511 
  lf_printf(file, "\n");
1512 
  lf_printf(file, "typedef struct _idecode_table_entry {\n");
1513 
  lf_printf(file, "  int shift;\n");
1514 
  lf_printf(file, "  instruction_word mask;\n");
1515 
  lf_printf(file, "  instruction_word value;");
1516 
  lf_printf(file, "  void *function_or_table;\n");
1517 
  lf_printf(file, "} idecode_table_entry;\n");
1518 
  lf_printf(file, "\n");
1519 
  lf_printf(file, "\n");
1520 
 
1521 
  if ((code & generate_calls)) {
1522 
 
1523 
    print_idecode_lookups(file, table, cache_rules);
1524 
 
1525 
    /* output the main idecode routine */
1526 
    print_idecode_run_function_header(file, 0/*can stop*/, 0/*is definition*/);
1527 
    print_run_until_stop_body(file, table, 0/* have stop argument */);
1528 
 
1529 
    print_idecode_run_function_header(file, 1/*can stop*/, 0/*is definition*/);
1530 
    print_run_until_stop_body(file, table, 1/* no stop argument */);
1531 
 
1532 
  }
1533 
  else if ((code & generate_jumps)) {
1534 
 
1535 
    print_idecode_run_function_header(file, 0/*can stop*/, 0/*is definition*/);
1536 
    print_jump_until_stop_body(file, table, cache_rules, 0 /* have stop argument */);
1537 
 
1538 
    print_idecode_run_function_header(file, 1/*can stop*/, 0/*is definition*/);
1539 
    print_jump_until_stop_body(file, table, cache_rules, 1/* have stop argument */);
1540 
 
1541 
  }
1542 
  else {
1543 
    error("Something is wrong!\n");
1544 
  }
1545 
}

powered by: WebSVN 2.1.0

© copyright 1999-2024 OpenCores.org, equivalent to Oliscience, all rights reserved. OpenCores®, registered trademark.