aboutsummaryrefslogtreecommitdiff
path: root/sim/ppc/gen-icache.c
blob: 8665ec8eacb76b3a40b462aae87e247a2496a0b9 (plain)
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192
193
194
195
196
197
198
199
200
201
202
203
204
205
206
207
208
209
210
211
212
213
214
215
216
217
218
219
220
221
222
223
224
225
226
227
228
229
230
231
232
233
234
235
236
237
238
239
240
241
242
243
244
245
246
247
248
249
250
251
252
253
254
255
256
257
258
259
260
261
262
263
264
265
266
267
268
269
270
271
272
273
274
275
276
277
278
279
280
281
282
283
284
285
286
287
288
289
290
291
292
293
294
295
296
297
298
299
300
301
302
303
304
305
306
307
308
309
310
311
312
313
314
315
316
317
318
319
320
321
322
323
324
325
326
327
328
329
330
331
332
333
334
335
336
337
338
339
340
341
342
343
344
345
346
347
348
349
350
351
352
353
354
355
356
357
358
359
360
361
362
363
364
365
366
367
368
369
370
371
372
373
374
375
376
377
378
379
380
381
382
383
384
385
386
387
388
389
390
391
392
393
394
395
396
397
398
399
400
401
402
403
404
405
406
407
408
409
410
411
412
413
414
415
416
417
418
419
420
421
422
423
424
425
426
427
428
429
430
431
432
433
434
435
436
437
438
439
440
441
442
443
444
445
446
447
448
449
450
451
452
453
454
455
456
457
458
459
460
461
462
463
464
465
466
467
468
469
470
471
472
473
474
475
476
477
478
479
480
481
482
483
484
485
486
487
488
489
490
491
492
493
494
495
496
497
498
499
500
501
502
503
504
505
506
507
508
509
510
511
512
513
514
515
516
517
518
519
520
521
522
523
524
525
526
527
528
529
530
531
532
533
534
535
536
537
538
539
540
541
542
543
544
545
546
547
548
549
550
551
552
553
554
555
556
557
558
559
560
561
562
563
564
565
566
567
568
569
570
571
572
573
574
575
576
577
578
579
580
581
582
583
584
585
586
587
588
589
590
591
592
593
594
595
596
597
598
599
600
601
602
603
604
605
606
607
608
609
610
611
612
613
614
615
616
617
618
619
620
621
622
623
624
625
626
627
628
629
630
631
632
633
634
635
636
637
638
639
640
641
642
643
644
645
646
647
648
649
650
651
652
653
654
655
656
657
658
659
660
661
662
663
664
665
666
667
668
669
670
671
672
673
674
675
/*  This file is part of the program psim.

    Copyright (C) 1994-1997, Andrew Cagney <cagney@highland.com.au>

    This program is free software; you can redistribute it and/or modify
    it under the terms of the GNU General Public License as published by
    the Free Software Foundation; either version 2 of the License, or
    (at your option) any later version.

    This program is distributed in the hope that it will be useful,
    but WITHOUT ANY WARRANTY; without even the implied warranty of
    MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
    GNU General Public License for more details.
 
    You should have received a copy of the GNU General Public License
    along with this program; if not, write to the Free Software
    Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA.
 
    */


#include "misc.h"
#include "lf.h"
#include "table.h"

#include "filter.h"

#include "ld-decode.h"
#include "ld-cache.h"
#include "ld-insn.h"

#include "igen.h"

#include "gen-semantics.h"
#include "gen-idecode.h"
#include "gen-icache.h"



static void
print_icache_function_header(lf *file,
			     const char *basename,
			     insn_bits *expanded_bits,
			     int is_function_definition)
{
  lf_printf(file, "\n");
  lf_print_function_type(file, ICACHE_FUNCTION_TYPE, "EXTERN_ICACHE", " ");
  print_function_name(file,
		      basename,
		      expanded_bits,
		      function_name_prefix_icache);
  lf_printf(file, "\n(%s)", ICACHE_FUNCTION_FORMAL); 
  if (!is_function_definition)
    lf_printf(file, ";");
  lf_printf(file, "\n");
}


void
print_icache_declaration(insn_table *entry,
			 lf *file,
			 void *data,
			 insn *instruction,
			 int depth)
{
  if (generate_expanded_instructions) {
    ASSERT(entry->nr_insn == 1);
    print_icache_function_header(file,
				 entry->insns->file_entry->fields[insn_name],
				 entry->expanded_bits,
				 0/* is not function definition */);
  }
  else {
    print_icache_function_header(file,
				 instruction->file_entry->fields[insn_name],
				 NULL,
				 0/* is not function definition */);
  }
}



static void
print_icache_extraction(lf *file,
			insn *instruction,
			const char *entry_name,
			const char *entry_type,
			const char *entry_expression,
			const char *original_name,
			const char *file_name,
			int line_nr,
			insn_field *cur_field,
			insn_bits *bits,
			icache_decl_type what_to_declare,
			icache_body_type what_to_do,
			const char *reason)
{
  const char *expression;
  ASSERT(entry_name != NULL);

  /* Define a storage area for the cache element */
  if (what_to_declare == undef_variables) {
    /* We've finished with the value - destory it */
    lf_indent_suppress(file);
    lf_printf(file, "#undef %s\n", entry_name);
    return;
  }
  else if (what_to_declare == define_variables) {
    lf_indent_suppress(file);
    lf_printf(file, "#define %s ", entry_name);
  }
  else {
    if (file_name != NULL)
      lf_print__external_reference(file, line_nr, file_name);
    lf_printf(file, "%s const %s UNUSED = ",
	      entry_type == NULL ? "unsigned" : entry_type,
	      entry_name);
  }

  /* define a value for that storage area as determined by what is in
     the cache */
  if (bits != NULL
      && strcmp(entry_name, cur_field->val_string) == 0
      && ((bits->opcode->is_boolean && bits->value == 0)
	  || (!bits->opcode->is_boolean))) {
    /* The simple field has been made constant (as a result of
       expanding instructions or similar).  Remember that for a
       boolean field, value is either 0 (implying the required
       boolean_constant) or nonzero (implying some other value and
       handled later below) - Define the variable accordingly */
    expression = "constant field";
    ASSERT(bits->field == cur_field);
    ASSERT(entry_type == NULL);
    if (bits->opcode->is_boolean)
      lf_printf(file, "%d", bits->opcode->boolean_constant);
    else if (bits->opcode->last < bits->field->last)
      lf_printf(file, "%d",
		bits->value << (bits->field->last - bits->opcode->last));
    else
      lf_printf(file, "%d", bits->value);
  }
  else if (bits != NULL
	   && original_name != NULL
	   && strncmp(entry_name,
		      original_name, strlen(original_name)) == 0
	   && strncmp(entry_name + strlen(original_name),
		      "_is_", strlen("_is_")) == 0
	   && ((bits->opcode->is_boolean
		&& (atol(entry_name + strlen(original_name) + strlen("_is_"))
		    == bits->opcode->boolean_constant))
	       || (!bits->opcode->is_boolean))) {
    expression = "constant compare";
    /* An entry, derived from ORIGINAL_NAME, is testing to see of the
       ORIGINAL_NAME has a specific constant value.  That value
       matching a boolean or constant field */
    if (bits->opcode->is_boolean)
      lf_printf(file, "%d /* %s == %d */",
		bits->value == 0,
		original_name,
		bits->opcode->boolean_constant);
    else if (bits->opcode->last < bits->field->last)
      lf_printf(file, "%d /* %s == %d */",
		(atol(entry_name + strlen(original_name) + strlen("_is_"))
		 == (bits->value << (bits->field->last - bits->opcode->last))),
		original_name,
		(bits->value << (bits->field->last - bits->opcode->last)));
    else
      lf_printf(file, "%d /* %s == %d */",
		(atol(entry_name + strlen(original_name) + strlen("_is_"))
		 == bits->value),
		original_name,
		bits->value);
  }
  else {
    /* put the field in the local variable, possibly also enter it
       into the cache */
    expression = "extraction";
    /* handle the cache */
    if ((what_to_do & get_values_from_icache)
	|| (what_to_do & put_values_in_icache)) {
      lf_printf(file, "cache_entry->crack.%s.%s",
		instruction->file_entry->fields[insn_form],
		entry_name);
      if (what_to_do & put_values_in_icache) /* also put it in the cache? */
	lf_printf(file, " = ");
    }
    if ((what_to_do & put_values_in_icache)
	|| what_to_do == do_not_use_icache) {
      if (cur_field != NULL && strcmp(entry_name, cur_field->val_string) == 0)
	lf_printf(file, "EXTRACTED32(instruction, %d, %d)",
		  i2target(hi_bit_nr, cur_field->first),
		  i2target(hi_bit_nr, cur_field->last));
      else if (entry_expression != NULL)
	lf_printf(file, "%s", entry_expression);
      else
	lf_printf(file, "eval_%s", entry_name);
    }
  }

  if (!((what_to_declare == define_variables)
	|| (what_to_declare == undef_variables)))
    lf_printf(file, ";");
  if (reason != NULL)
    lf_printf(file, " /* %s - %s */", reason, expression);
  lf_printf(file, "\n");
}


void
print_icache_body(lf *file,
		  insn *instruction,
		  insn_bits *expanded_bits,
		  cache_table *cache_rules,
		  icache_decl_type what_to_declare,
		  icache_body_type what_to_do)
{
  insn_field *cur_field;
  
  /* extract instruction fields */
  lf_printf(file, "/* extraction: %s ",
	    instruction->file_entry->fields[insn_format]);
  switch (what_to_declare) {
  case define_variables:
    lf_printf(file, "#define");
    break;
  case declare_variables:
    lf_printf(file, "declare");
    break;
  case undef_variables:
    lf_printf(file, "#undef");
    break;
  }
  lf_printf(file, " ");
  switch (what_to_do) {
  case get_values_from_icache:
    lf_printf(file, "get-values-from-icache");
    break;
  case put_values_in_icache:
    lf_printf(file, "put-values-in-icache");
    break;
  case both_values_and_icache:
    lf_printf(file, "get-values-from-icache|put-values-in-icache");
    break;
  case do_not_use_icache:
    lf_printf(file, "do-not-use-icache");
    break;
  }
  lf_printf(file, " */\n");
  
  for (cur_field = instruction->fields->first;
       cur_field->first < insn_bit_size;
       cur_field = cur_field->next) {
    if (cur_field->is_string) {
      insn_bits *bits;
      int found_rule = 0;
      /* find any corresponding value */
      for (bits = expanded_bits;
	   bits != NULL;
	   bits = bits->last) {
	if (bits->field == cur_field)
	  break;
      }
      /* try the cache rule table for what to do */
      {
	cache_table *cache_rule;
	for (cache_rule = cache_rules;
	     cache_rule != NULL;
	     cache_rule = cache_rule->next) {
	  if (strcmp(cur_field->val_string, cache_rule->field_name) == 0) {
	    found_rule = 1;
	    if (cache_rule->type == scratch_value
		&& ((what_to_do & put_values_in_icache)
		    || what_to_do == do_not_use_icache))
	      print_icache_extraction(file,
				      instruction,
				      cache_rule->derived_name,
				      cache_rule->type_def,
				      cache_rule->expression,
				      cache_rule->field_name,
				      cache_rule->file_entry->file_name,
				      cache_rule->file_entry->line_nr,
				      cur_field,
				      bits,
				      what_to_declare,
				      do_not_use_icache,
				      "icache scratch");
	    else if (cache_rule->type == compute_value
		     && ((what_to_do & get_values_from_icache)
			 || what_to_do == do_not_use_icache))
	      print_icache_extraction(file,
				      instruction,
				      cache_rule->derived_name,
				      cache_rule->type_def,
				      cache_rule->expression,
				      cache_rule->field_name,
				      cache_rule->file_entry->file_name,
				      cache_rule->file_entry->line_nr,
				      cur_field,
				      bits,
				      what_to_declare,
				      do_not_use_icache,
				      "semantic compute");
	    else if (cache_rule->type == cache_value
		     && ((what_to_declare != undef_variables)
			 || !(what_to_do & put_values_in_icache)))
	      print_icache_extraction(file,
				      instruction,
				      cache_rule->derived_name,
				      cache_rule->type_def,
				      cache_rule->expression,
				      cache_rule->field_name,
				      cache_rule->file_entry->file_name,
				      cache_rule->file_entry->line_nr,
				      cur_field,
				      bits,
				      ((what_to_do & put_values_in_icache)
				       ? declare_variables
				       : what_to_declare),
				      what_to_do,
				      "in icache");
	  }
	}
      }
      /* No rule at all, assume that this is needed in the semantic
         function (when values are extracted from the icache) and
         hence must be put into the cache */
      if (found_rule == 0
	  && ((what_to_declare != undef_variables)
	      || !(what_to_do & put_values_in_icache)))
	print_icache_extraction(file,
				instruction,
				cur_field->val_string,
				NULL, NULL, NULL, /* type, exp, orig */
				instruction->file_entry->file_name,
				instruction->file_entry->line_nr,
				cur_field,
				bits,
				((what_to_do & put_values_in_icache)
				 ? declare_variables
				 : what_to_declare),
				what_to_do,
				"default in icache");
      /* any thing else ... */
    }
  }

  lf_print__internal_reference(file);

  if ((code & generate_with_insn_in_icache)) {
    lf_printf(file, "\n");
    print_icache_extraction(file,
			    instruction,
			    "insn",
			    "instruction_word",
			    "instruction",
			    NULL, /* origin */
			    NULL, 0, /* file_name & line_nr */
			    NULL, NULL,
			    what_to_declare,
			    what_to_do,
			    NULL);
  }
}



typedef struct _icache_tree icache_tree;
struct _icache_tree {
  char *name;
  icache_tree *next;
  icache_tree *children;
};

static icache_tree *
icache_tree_insert(icache_tree *tree,
		   char *name)
{
  icache_tree *new_tree;
  /* find it */
  icache_tree **ptr_to_cur_tree = &tree->children;
  icache_tree *cur_tree = *ptr_to_cur_tree;
  while (cur_tree != NULL
	 && strcmp(cur_tree->name, name) < 0) {
    ptr_to_cur_tree = &cur_tree->next;
    cur_tree = *ptr_to_cur_tree;
  }
  ASSERT(cur_tree == NULL
	 || strcmp(cur_tree->name, name) >= 0);
  /* already in the tree */
  if (cur_tree != NULL
      && strcmp(cur_tree->name, name) == 0)
    return cur_tree;
  /* missing, insert it */
  ASSERT(cur_tree == NULL
	 || strcmp(cur_tree->name, name) > 0);
  new_tree = ZALLOC(icache_tree);
  new_tree->name = name;
  new_tree->next = cur_tree;
  *ptr_to_cur_tree = new_tree;
  return new_tree;
}


static icache_tree *
insn_table_cache_fields(insn_table *table)
{
  icache_tree *tree = ZALLOC(icache_tree);
  insn *instruction;
  for (instruction = table->insns;
       instruction != NULL;
       instruction = instruction->next) {
    insn_field *field;
    icache_tree *form =
      icache_tree_insert(tree,
			 instruction->file_entry->fields[insn_form]);
    for (field = instruction->fields->first;
	 field != NULL;
	 field = field->next) {
      if (field->is_string)
	icache_tree_insert(form, field->val_string);
    }
  }
  return tree;
}



extern void
print_icache_struct(insn_table *instructions,
		    cache_table *cache_rules,
		    lf *file)
{
  icache_tree *tree = insn_table_cache_fields(instructions);
  
  lf_printf(file, "\n");
  lf_printf(file, "#define WITH_IDECODE_CACHE_SIZE %d\n",
	    (code & generate_with_icache) ? icache_size : 0);
  lf_printf(file, "\n");
  
  /* create an instruction cache if being used */
  if ((code & generate_with_icache)) {
    icache_tree *form;
    lf_printf(file, "typedef struct _idecode_cache {\n");
    lf_printf(file, "  unsigned_word address;\n");
    lf_printf(file, "  void *semantic;\n");
    lf_printf(file, "  union {\n");
    for (form = tree->children;
	 form != NULL;
	 form = form->next) {
      icache_tree *field;
      lf_printf(file, "    struct {\n");
      if (code & generate_with_insn_in_icache)
	lf_printf(file, "      instruction_word insn;\n");
      for (field = form->children;
	   field != NULL;
	   field = field->next) {
	cache_table *cache_rule;
	int found_rule = 0;
	for (cache_rule = cache_rules;
	     cache_rule != NULL;
	     cache_rule = cache_rule->next) {
	  if (strcmp(field->name, cache_rule->field_name) == 0) {
	    found_rule = 1;
	    if (cache_rule->derived_name != NULL)
	      lf_printf(file, "      %s %s; /* %s */\n",
			(cache_rule->type_def == NULL
			 ? "unsigned" 
			 : cache_rule->type_def),
			cache_rule->derived_name,
			cache_rule->field_name);
	  }
	}
	if (!found_rule)
	  lf_printf(file, "      unsigned %s;\n", field->name);
      }
      lf_printf(file, "    } %s;\n", form->name);
    }
    lf_printf(file, "  } crack;\n");
    lf_printf(file, "} idecode_cache;\n");
  }
  else {
    /* alernativly, since no cache, emit a dummy definition for
       idecode_cache so that code refering to the type can still compile */
    lf_printf(file, "typedef void idecode_cache;\n");
  }
  lf_printf(file, "\n");
}



static void
print_icache_function(lf *file,
		      insn *instruction,
		      insn_bits *expanded_bits,
		      opcode_field *opcodes,
		      cache_table *cache_rules)
{
  int indent;

  /* generate code to enter decoded instruction into the icache */
  lf_printf(file, "\n");
  lf_print_function_type(file, ICACHE_FUNCTION_TYPE, "EXTERN_ICACHE", "\n");
  indent = print_function_name(file,
			       instruction->file_entry->fields[insn_name],
			       expanded_bits,
			       function_name_prefix_icache);
  lf_indent(file, +indent);
  lf_printf(file, "(%s)\n", ICACHE_FUNCTION_FORMAL);
  lf_indent(file, -indent);
  
  /* function header */
  lf_printf(file, "{\n");
  lf_indent(file, +2);
  
  print_my_defines(file, expanded_bits, instruction->file_entry);
  print_itrace(file, instruction->file_entry, 1/*putting-value-in-cache*/);
  
  print_idecode_validate(file, instruction, opcodes);
  
  lf_printf(file, "\n");
  lf_printf(file, "{\n");
  lf_indent(file, +2);
  if ((code & generate_with_semantic_icache))
    lf_printf(file, "unsigned_word nia;\n");
  print_icache_body(file,
		    instruction,
		    expanded_bits,
		    cache_rules,
		    ((code & generate_with_direct_access)
		     ? define_variables
		     : declare_variables),
		    ((code & generate_with_semantic_icache)
		     ? both_values_and_icache
		     : put_values_in_icache));
  
  lf_printf(file, "\n");
  lf_printf(file, "cache_entry->address = cia;\n");
  lf_printf(file, "cache_entry->semantic = ");
  print_function_name(file,
		      instruction->file_entry->fields[insn_name],
		      expanded_bits,
		      function_name_prefix_semantics);
  lf_printf(file, ";\n");
  lf_printf(file, "\n");

  if ((code & generate_with_semantic_icache)) {
    lf_printf(file, "/* semantic routine */\n");
    print_semantic_body(file,
			instruction,
			expanded_bits,
			opcodes);
    lf_printf(file, "return nia;\n");
  }
  
  if (!(code & generate_with_semantic_icache)) {
    lf_printf(file, "/* return the function proper */\n");
    lf_printf(file, "return ");
    print_function_name(file,
			instruction->file_entry->fields[insn_name],
			expanded_bits,
			function_name_prefix_semantics);
    lf_printf(file, ";\n");
  }
  
  if ((code & generate_with_direct_access))
    print_icache_body(file,
		      instruction,
		      expanded_bits,
		      cache_rules,
		      undef_variables,
		      ((code & generate_with_semantic_icache)
		       ? both_values_and_icache
		       : put_values_in_icache));

  lf_indent(file, -2);
  lf_printf(file, "}\n");
  lf_indent(file, -2);
  lf_printf(file, "}\n");
}


void
print_icache_definition(insn_table *entry,
			lf *file,
			void *data,
			insn *instruction,
			int depth)
{
  cache_table *cache_rules = (cache_table*)data;
  if (generate_expanded_instructions) {
    ASSERT(entry->nr_insn == 1
	   && entry->opcode == NULL
	   && entry->parent != NULL
	   && entry->parent->opcode != NULL);
    ASSERT(entry->nr_insn == 1
	   && entry->opcode == NULL
	   && entry->parent != NULL
	   && entry->parent->opcode != NULL
	   && entry->parent->opcode_rule != NULL);
    print_icache_function(file,
			  entry->insns,
			  entry->expanded_bits,
			  entry->opcode,
			  cache_rules);
  }
  else {
    print_icache_function(file,
			  instruction,
			  NULL,
			  NULL,
			  cache_rules);
  }
}



void
print_icache_internal_function_declaration(insn_table *table,
					   lf *file,
					   void *data,
					   table_entry *function)
{
  ASSERT((code & generate_with_icache) != 0);
  if (it_is("internal", function->fields[insn_flags])) {
    lf_printf(file, "\n");
    lf_print_function_type(file, ICACHE_FUNCTION_TYPE, "PSIM_INLINE_ICACHE",
			   "\n");
    print_function_name(file,
			function->fields[insn_name],
			NULL,
			function_name_prefix_icache);
    lf_printf(file, "\n(%s);\n", ICACHE_FUNCTION_FORMAL);
  }
}


void
print_icache_internal_function_definition(insn_table *table,
					  lf *file,
					  void *data,
					  table_entry *function)
{
  ASSERT((code & generate_with_icache) != 0);
  if (it_is("internal", function->fields[insn_flags])) {
    lf_printf(file, "\n");
    lf_print_function_type(file, ICACHE_FUNCTION_TYPE, "PSIM_INLINE_ICACHE",
			   "\n");
    print_function_name(file,
			function->fields[insn_name],
			NULL,
			function_name_prefix_icache);
    lf_printf(file, "\n(%s)\n", ICACHE_FUNCTION_FORMAL);
    lf_printf(file, "{\n");
    lf_indent(file, +2);
    lf_printf(file, "/* semantic routine */\n");
    table_entry_print_cpp_line_nr(file, function);
    if ((code & generate_with_semantic_icache)) {
      lf_print__c_code(file, function->annex);
      lf_printf(file, "error(\"Internal function must longjump\\n\");\n");
      lf_printf(file, "return 0;\n");
    }
    else {
      lf_printf(file, "return ");
      print_function_name(file,
			  function->fields[insn_name],
			  NULL,
			  function_name_prefix_semantics);
      lf_printf(file, ";\n");
    }
    
    lf_print__internal_reference(file);
    lf_indent(file, -2);
    lf_printf(file, "}\n");
  }
}