aboutsummaryrefslogtreecommitdiff
path: root/gas/config/tc-pj.c
blob: fbd0eb66e865f2d1216f4aafefbd5ce7f544572d (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
/*-
   tc-pj.c -- Assemble code for Pico Java
   Copyright 1999, 2000 Free Software Foundation, Inc.

   This file is part of GAS, the GNU Assembler.

   GAS 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, or (at your option)
   any later version.

   GAS 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 GAS; see the file COPYING.  If not, write to
   the Free Software Foundation, 59 Temple Place - Suite 330,
   Boston, MA 02111-1307, USA.  */

/* Contributed by Steve Chamberlain of Transmeta <sac@pobox.com>.  */

#include "as.h"
#include "opcode/pj.h"

extern const pj_opc_info_t pj_opc_info[512];

const char comment_chars[] = "!/";
const char line_separator_chars[] = ";";
const char line_comment_chars[] = "/!#";

static int pending_reloc;
static struct hash_control *opcode_hash_control;

static void
little (ignore)
     int ignore ATTRIBUTE_UNUSED;
{
  target_big_endian = 0;
}

static void
big (ignore)
     int ignore ATTRIBUTE_UNUSED;
{
  target_big_endian = 1;
}

const pseudo_typeS md_pseudo_table[] = {
  {"ml",    little, 0},
  {"mb",    big,    0},
  {0, 0, 0}
};

const char FLT_CHARS[] = "rRsSfFdDxXpP";
const char EXP_CHARS[] = "eE";

void
md_operand (op)
     expressionS *op;
{
  if (strncmp (input_line_pointer, "%hi16", 5) == 0)
    {
      if (pending_reloc)
	as_bad (_("confusing relocation expressions"));
      pending_reloc = BFD_RELOC_PJ_CODE_HI16;
      input_line_pointer += 5;
      expression (op);
    }
  if (strncmp (input_line_pointer, "%lo16", 5) == 0)
    {
      if (pending_reloc)
	as_bad (_("confusing relocation expressions"));
      pending_reloc = BFD_RELOC_PJ_CODE_LO16;
      input_line_pointer += 5;
      expression (op);
    }
}

/* Parse an expression and then restore the input line pointer.  */

static char *
parse_exp_save_ilp (s, op)
     char *s;
     expressionS *op;
{
  char *save = input_line_pointer;
  input_line_pointer = s;
  expression (op);
  s = input_line_pointer;
  input_line_pointer = save;
  return s;
}

/* This is called by emit_expr via TC_CONS_FIX_NEW when creating a
   reloc for a cons.  We could use the definition there, except that
   we want to handle magic pending reloc expressions specially.  */

void
pj_cons_fix_new_pj (frag, where, nbytes, exp)
     fragS *frag;
     int where;
     int nbytes;
     expressionS *exp;
{
  static int rv[5][2] =
  { { 0, 0 },
    { BFD_RELOC_8, BFD_RELOC_8 },
    { BFD_RELOC_PJ_CODE_DIR16, BFD_RELOC_16 },
    { 0, 0 },
    { BFD_RELOC_PJ_CODE_DIR32, BFD_RELOC_32 }};

  fix_new_exp (frag, where, nbytes, exp, 0,
	       pending_reloc ? pending_reloc
	       : rv[nbytes][(now_seg->flags & SEC_CODE) ? 0 : 1]);

  pending_reloc = 0;
}

/* Turn a reloc description character from the pj-opc.h table into
   code which BFD can handle.  */

static int
c_to_r (x)
     char x;
{
  switch (x)
    {
    case O_R8:
      return BFD_RELOC_8_PCREL;
    case O_U8:
    case O_8:
      return BFD_RELOC_8;
    case O_R16:
      return BFD_RELOC_PJ_CODE_REL16;
    case O_U16:
    case O_16:
      return BFD_RELOC_PJ_CODE_DIR16;
    case O_R32:
      return BFD_RELOC_PJ_CODE_REL32;
    case O_32:
      return BFD_RELOC_PJ_CODE_DIR32;
    }
  abort ();
  return 0;
}

/* Handler for the ipush fake opcode,
   turns ipush <foo> into sipush lo16<foo>, sethi hi16<foo>.  */

static void
ipush_code (opcode, str)
     pj_opc_info_t *opcode ATTRIBUTE_UNUSED;
     char *str;
{
  int mod = 0;
  char *b = frag_more (6);
  expressionS arg;

  b[0] = 0x11;
  b[3] = 0xed;
  parse_exp_save_ilp (str + 1, &arg, &mod);
  if (mod)
    as_bad (_("can't have relocation for ipush"));

  fix_new_exp (frag_now, b - frag_now->fr_literal + 1, 2,
	       &arg, 0, BFD_RELOC_PJ_CODE_DIR16);
  fix_new_exp (frag_now, b - frag_now->fr_literal + 4, 2,
	       &arg, 0, BFD_RELOC_PJ_CODE_HI16);
}

/* Insert names into the opcode table which are really mini macros,
   not opcodes.  The fakeness is inidicated with an opcode of -1.  */

static void
fake_opcode (name, func)
     const char *name;
     void (*func) ();
{
  pj_opc_info_t *fake = (pj_opc_info_t *) xmalloc (sizeof (pj_opc_info_t));

  fake->opcode = -1;
  fake->opcode_next = -1;
  fake->name = (const char *) func;
  hash_insert (opcode_hash_control, name, (char *) fake);
}

/* Enter another entry into the opcode hash table so the same opcode
   can have another name.  */

static void
alias (new, old)
     const char *new;
     const char *old;
{
  hash_insert (opcode_hash_control, new,
	       (char *) hash_find (opcode_hash_control, old));
}

/* This function is called once, at assembler startup time.  It sets
   up the hash table with all the opcodes in it, and also initializes
   some aliases for compatibility with other assemblers.  */

void
md_begin ()
{
  const pj_opc_info_t *opcode;
  opcode_hash_control = hash_new ();

  /* Insert names into hash table.  */
  for (opcode = pj_opc_info; opcode->name; opcode++)
    hash_insert (opcode_hash_control, opcode->name, (char *) opcode);

  /* Insert the only fake opcode.  */
  fake_opcode ("ipush", ipush_code);

  /* Add some aliases for opcode names.  */
  alias ("ifeq_s", "ifeq");
  alias ("ifne_s", "ifne");
  alias ("if_icmpge_s", "if_icmpge");
  alias ("if_icmpne_s", "if_icmpne");
  alias ("if_icmpeq_s", "if_icmpeq");
  alias ("if_icmpgt_s", "if_icmpgt");
  alias ("goto_s", "goto");

  bfd_set_arch_mach (stdoutput, TARGET_ARCH, 0);
}

/* This is the guts of the machine-dependent assembler.  STR points to
   a machine dependent instruction.  This function is supposed to emit
   the frags/bytes it assembles to.  */

void
md_assemble (str)
     char *str;
{
  unsigned char *op_start;
  unsigned char *op_end;

#if 0
  pj_operan_info operand[3];
#endif
  pj_opc_info_t *opcode;
  char *output;
  int idx = 0;
  char pend;

  int nlen = 0;

  /* Drop leading whitespace.  */
  while (*str == ' ')
    str++;

  /* Find the op code end.  */
  for (op_start = op_end = (unsigned char *) (str);
       *op_end && !is_end_of_line[*op_end] && *op_end != ' ';
       op_end++)
    nlen++;

  pend = *op_end;
  *op_end = 0;

  if (nlen == 0)
    as_bad (_("can't find opcode "));

  opcode = (pj_opc_info_t *) hash_find (opcode_hash_control, op_start);
  *op_end = pend;

  if (opcode == NULL)
    {
      as_bad (_("unknown opcode %s"), op_start);
      return;
    }

  if (opcode->opcode == -1)
    {
      /* It's a fake opcode.  Dig out the args and pretend that was
         what we were passed.  */
      ((void (*) ()) opcode->name) (opcode, op_end);
    }
  else
    {
      int an;

      output = frag_more (opcode->len);
      output[idx++] = opcode->opcode;

      if (opcode->opcode_next != -1)
	output[idx++] = opcode->opcode_next;

      for (an = 0; opcode->arg[an]; an++)
	{
	  expressionS arg;

	  if (*op_end == ',' && an != 0)
	    op_end++;

	  if (*op_end == 0)
	    as_bad ("expected expresssion");

	  op_end = parse_exp_save_ilp (op_end, &arg);

	  fix_new_exp (frag_now,
		       output - frag_now->fr_literal + idx,
		       ASIZE (opcode->arg[an]),
		       &arg,
		       PCREL (opcode->arg[an]),
		       pending_reloc ? pending_reloc : c_to_r (opcode->arg[an]));

	  idx += ASIZE (opcode->arg[an]);
	  pending_reloc = 0;
	}

      while (isspace (*op_end))
	op_end++;

      if (*op_end != 0)
	as_warn ("extra stuff on line ignored");

    }

  if (pending_reloc)
    as_bad ("Something forgot to clean up\n");

}

/* Turn a string in input_line_pointer into a floating point constant
   of type type, and store the appropriate bytes in *LITP.  The number
   of LITTLENUMS emitted is stored in *SIZEP .  An error message is
   returned, or NULL on OK.  */

char *
md_atof (type, litP, sizeP)
     int type;
     char *litP;
     int *sizeP;
{
  int prec;
  LITTLENUM_TYPE words[4];
  char *t;
  int i;

  switch (type)
    {
    case 'f':
      prec = 2;
      break;

    case 'd':
      prec = 4;
      break;

    default:
      *sizeP = 0;
      return _("bad call to md_atof");
    }

  t = atof_ieee (input_line_pointer, type, words);
  if (t)
    input_line_pointer = t;

  *sizeP = prec * 2;

  if (!target_big_endian)
    {
      for (i = prec - 1; i >= 0; i--)
	{
	  md_number_to_chars (litP, (valueT) words[i], 2);
	  litP += 2;
	}
    }
  else
    {
      for (i = 0; i < prec; i++)
	{
	  md_number_to_chars (litP, (valueT) words[i], 2);
	  litP += 2;
	}
    }

  return NULL;
}

CONST char *md_shortopts = "";

struct option md_longopts[] = {

#define OPTION_LITTLE (OPTION_MD_BASE)
#define OPTION_BIG    (OPTION_LITTLE + 1)

  {"little", no_argument, NULL, OPTION_LITTLE},
  {"big", no_argument, NULL, OPTION_BIG},
  {NULL, no_argument, NULL, 0}
};
size_t md_longopts_size = sizeof (md_longopts);

int
md_parse_option (c, arg)
     int c;
     char *arg ATTRIBUTE_UNUSED;
{
  switch (c)
    {
    case OPTION_LITTLE:
      little ();
      break;
    case OPTION_BIG:
      big ();
      break;
    default:
      return 0;
    }
  return 1;
}

void
md_show_usage (stream)
     FILE *stream;
{
  fprintf (stream, _("\
PJ options:\n\
-little			generate little endian code\n\
-big			generate big endian code\n"));
}

/* Apply a fixup to the object file.  */

int
md_apply_fix (fixP, valp)
     fixS *fixP;
     valueT *valp;
{
  char *buf = fixP->fx_where + fixP->fx_frag->fr_literal;
  long val = *valp;
  long max, min;
  int shift;

  /* adjust_reloc_syms won't convert a reloc against a weak symbol
     into a reloc against a section, but bfd_install_relocation will
     screw up if the symbol is defined, so we have to adjust val here
     to avoid the screw up later.  */

  if (fixP->fx_addsy != NULL && S_IS_WEAK (fixP->fx_addsy))
    val -= S_GET_VALUE (fixP->fx_addsy);

  max = min = 0;
  shift = 0;
  switch (fixP->fx_r_type)
    {
    case BFD_RELOC_VTABLE_INHERIT:
    case BFD_RELOC_VTABLE_ENTRY:
      fixP->fx_done = 0;
      return 0;

    case BFD_RELOC_PJ_CODE_REL16:
      if (val < -0x8000 || val >= 0x7fff)
	as_bad_where (fixP->fx_file, fixP->fx_line, _("pcrel too far"));
      buf[0] |= (val >> 8) & 0xff;
      buf[1] = val & 0xff;
      break;

    case BFD_RELOC_PJ_CODE_HI16:
      *buf++ = val >> 24;
      *buf++ = val >> 16;
      fixP->fx_addnumber = val & 0xffff;
      break;

    case BFD_RELOC_PJ_CODE_DIR16:
    case BFD_RELOC_PJ_CODE_LO16:
      *buf++ = val >> 8;
      *buf++ = val >> 0;

      max = 0xffff;
      min = -0xffff;
      break;

    case BFD_RELOC_8:
      max = 0xff;
      min = -0xff;
      *buf++ = val;
      break;

    case BFD_RELOC_PJ_CODE_DIR32:
      *buf++ = val >> 24;
      *buf++ = val >> 16;
      *buf++ = val >> 8;
      *buf++ = val >> 0;
      break;

    case BFD_RELOC_32:
      if (target_big_endian)
	{
	  *buf++ = val >> 24;
	  *buf++ = val >> 16;
	  *buf++ = val >> 8;
	  *buf++ = val >> 0;
	}
      else
	{
	  *buf++ = val >> 0;
	  *buf++ = val >> 8;
	  *buf++ = val >> 16;
	  *buf++ = val >> 24;
	}
      break;

    case BFD_RELOC_16:
      if (target_big_endian)
	{
	  *buf++ = val >> 8;
	  *buf++ = val >> 0;
	}
      else
	{
	  *buf++ = val >> 0;
	  *buf++ = val >> 8;
	}
      break;

    default:
      abort ();
    }

  if (max != 0 && (val < min || val > max))
    as_bad_where (fixP->fx_file, fixP->fx_line, _("offset out of range"));

  return 0;
}

/* Put number into target byte order.  Always put values in an
   executable section into big endian order.  */

void
md_number_to_chars (ptr, use, nbytes)
     char *ptr;
     valueT use;
     int nbytes;
{
  if (target_big_endian || now_seg->flags & SEC_CODE)
    number_to_chars_bigendian (ptr, use, nbytes);
  else
    number_to_chars_littleendian (ptr, use, nbytes);
}

/* Translate internal representation of relocation info to BFD target
   format.  */

arelent *
tc_gen_reloc (section, fixp)
     asection *section ATTRIBUTE_UNUSED;
     fixS *fixp;
{
  arelent *rel;
  bfd_reloc_code_real_type r_type;

  rel = (arelent *) xmalloc (sizeof (arelent));
  rel->sym_ptr_ptr = (asymbol **) xmalloc (sizeof (asymbol *));
  *rel->sym_ptr_ptr = symbol_get_bfdsym (fixp->fx_addsy);
  rel->address = fixp->fx_frag->fr_address + fixp->fx_where;

  r_type = fixp->fx_r_type;
  rel->addend = fixp->fx_addnumber;
  rel->howto = bfd_reloc_type_lookup (stdoutput, r_type);

  if (rel->howto == NULL)
    {
      as_bad_where (fixp->fx_file, fixp->fx_line,
		    _("Cannot represent relocation type %s"),
		    bfd_get_reloc_code_name (r_type));
      /* Set howto to a garbage value so that we can keep going.  */
      rel->howto = bfd_reloc_type_lookup (stdoutput, BFD_RELOC_32);
      assert (rel->howto != NULL);
    }

  return rel;
}