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[/] [openrisc/] [trunk/] [gnu-src/] [binutils-2.20.1/] [gas/] [config/] [tc-lm32.c] - Blame information for rev 205

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1 205 julius
/* tc-lm32.c - Lattice Mico32 assembler.
2
   Copyright 2008   Free Software Foundation, Inc.
3
   Contributed by Jon Beniston <jon@beniston.com>
4
 
5
   This file is part of GAS, the GNU Assembler.
6
 
7
   GAS is free software; you can redistribute it and/or modify
8
   it under the terms of the GNU General Public License as published by
9
   the Free Software Foundation; either version 2, or (at your option)
10
   any later version.
11
 
12
   GAS is distributed in the hope that it will be useful,
13
   but WITHOUT ANY WARRANTY; without even the implied warranty of
14
   MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
15
   GNU General Public License for more details.
16
 
17
   You should have received a copy of the GNU General Public License along
18
   with GAS; see the file COPYING.  If not, write to the Free Software
19
   Foundation, 51 Franklin Street - Fifth Floor, Boston,
20
   MA 02110-1301, USA.  */
21
 
22
#include <string.h>
23
#include <stdlib.h>
24
 
25
#include "as.h"
26
#include "safe-ctype.h"
27
#include "subsegs.h"
28
#include "bfd.h"
29
#include "safe-ctype.h"
30
#include "opcodes/lm32-desc.h"
31
#include "opcodes/lm32-opc.h"
32
#include "cgen.h"
33
#include "elf/lm32.h"
34
 
35
typedef struct
36
{
37
  const CGEN_INSN *insn;
38
  const CGEN_INSN *orig_insn;
39
  CGEN_FIELDS fields;
40
#if CGEN_INT_INSN_P
41
  CGEN_INSN_INT buffer [1];
42
#define INSN_VALUE(buf) (*(buf))
43
#else
44
  unsigned char buffer[CGEN_MAX_INSN_SIZE];
45
#define INSN_VALUE(buf) (buf)
46
#endif
47
  char *addr;
48
  fragS *frag;
49
  int num_fixups;
50
  fixS *fixups[GAS_CGEN_MAX_FIXUPS];
51
  int indices[MAX_OPERAND_INSTANCES];
52
} lm32_insn;
53
 
54
/* Configuration options */
55
 
56
#define LM_CFG_MULTIPLIY_ENABLED        0x0001
57
#define LM_CFG_DIVIDE_ENABLED           0x0002
58
#define LM_CFG_BARREL_SHIFT_ENABLED     0x0004
59
#define LM_CFG_SIGN_EXTEND_ENABLED      0x0008
60
#define LM_CFG_USER_ENABLED             0x0010
61
#define LM_CFG_ICACHE_ENABLED           0x0020
62
#define LM_CFG_DCACHE_ENABLED           0x0040
63
#define LM_CFG_BREAK_ENABLED            0x0080
64
 
65
static unsigned config = 0U;
66
 
67
/* Target specific assembler tokens / delimiters.  */
68
 
69
const char comment_chars[]        = "#";
70
const char line_comment_chars[]   = "#";
71
const char line_separator_chars[] = ";";
72
const char EXP_CHARS[]            = "eE";
73
const char FLT_CHARS[]            = "dD";
74
 
75
/* Target specific assembly directives.  */
76
 
77
const pseudo_typeS md_pseudo_table[] =
78
{
79
  { "align",   s_align_bytes,       0 },
80
  { "byte",    cons,                1 },
81
  { "hword",   cons,                2 },
82
  { "word",    cons,                4 },
83
  { "dword",   cons,                8 },
84
  {(char *)0 , (void(*)(int))0,     0}
85
};
86
 
87
/* Target specific command line options.  */
88
 
89
const char * md_shortopts = "";
90
 
91
struct option md_longopts[] =
92
{
93
#define OPTION_MULTIPLY_ENABLED         (OPTION_MD_BASE + 1)
94
  { "mmultiply-enabled",            no_argument, NULL, OPTION_MULTIPLY_ENABLED },
95
#define OPTION_DIVIDE_ENABLED           (OPTION_MD_BASE + 2)
96
  { "mdivide-enabled",              no_argument, NULL, OPTION_DIVIDE_ENABLED },
97
#define OPTION_BARREL_SHIFT_ENABLED     (OPTION_MD_BASE + 3)
98
  { "mbarrel-shift-enabled",        no_argument, NULL, OPTION_BARREL_SHIFT_ENABLED },
99
#define OPTION_SIGN_EXTEND_ENABLED      (OPTION_MD_BASE + 4)
100
  { "msign-extend-enabled",         no_argument, NULL, OPTION_SIGN_EXTEND_ENABLED },
101
#define OPTION_USER_ENABLED             (OPTION_MD_BASE + 5)
102
  { "muser-enabled",                no_argument, NULL, OPTION_USER_ENABLED },
103
#define OPTION_ICACHE_ENABLED           (OPTION_MD_BASE + 6)
104
  { "micache-enabled",              no_argument, NULL, OPTION_ICACHE_ENABLED },
105
#define OPTION_DCACHE_ENABLED           (OPTION_MD_BASE + 7)
106
  { "mdcache-enabled",              no_argument, NULL, OPTION_DCACHE_ENABLED },
107
#define OPTION_BREAK_ENABLED            (OPTION_MD_BASE + 8)
108
  { "mbreak-enabled",               no_argument, NULL, OPTION_BREAK_ENABLED },
109
#define OPTION_ALL_ENABLED              (OPTION_MD_BASE + 9)
110
  { "mall-enabled",                 no_argument, NULL, OPTION_ALL_ENABLED },
111
};
112
 
113
size_t md_longopts_size = sizeof (md_longopts);
114
 
115
/* Display architecture specific options.  */
116
 
117
void
118
md_show_usage (FILE * fp)
119
{
120
  fprintf (fp, "LM32 specific options:\n"
121
        "  -mmultiply-enabled          enable multiply instructions\n"
122
        "  -mdivide-enabled            enable divide and modulus instructions\n"
123
        "  -mbarrel-shift-enabled      enable multi-bit shift instructions\n"
124
        "  -msign-extend-enabled       enable sign-extension instructions\n"
125
        "  -muser-enabled              enable user-defined instructions\n"
126
        "  -micache-enabled            enable instruction cache instructions\n"
127
        "  -mdcache-enabled            enable data cache instructions\n"
128
        "  -mbreak-enabled             enable the break instruction\n"
129
        "  -mall-enabled               enable all optional instructions\n"
130
        );
131
}
132
 
133
/* Parse command line options.  */
134
 
135
int
136
md_parse_option (int c, char * arg ATTRIBUTE_UNUSED)
137
{
138
  switch (c)
139
    {
140
      case OPTION_MULTIPLY_ENABLED:
141
        config |= LM_CFG_MULTIPLIY_ENABLED;
142
        break;
143
      case OPTION_DIVIDE_ENABLED:
144
        config |= LM_CFG_DIVIDE_ENABLED;
145
        break;
146
      case OPTION_BARREL_SHIFT_ENABLED:
147
        config |= LM_CFG_BARREL_SHIFT_ENABLED;
148
        break;
149
      case OPTION_SIGN_EXTEND_ENABLED:
150
        config |= LM_CFG_SIGN_EXTEND_ENABLED;
151
        break;
152
      case OPTION_USER_ENABLED:
153
        config |= LM_CFG_USER_ENABLED;
154
        break;
155
      case OPTION_ICACHE_ENABLED:
156
        config |= LM_CFG_ICACHE_ENABLED;
157
        break;
158
      case OPTION_DCACHE_ENABLED:
159
        config |= LM_CFG_DCACHE_ENABLED;
160
        break;
161
      case OPTION_BREAK_ENABLED:
162
        config |= LM_CFG_BREAK_ENABLED;
163
        break;
164
      case OPTION_ALL_ENABLED:
165
        config |= LM_CFG_MULTIPLIY_ENABLED;
166
        config |= LM_CFG_DIVIDE_ENABLED;
167
        config |= LM_CFG_BARREL_SHIFT_ENABLED;
168
        config |= LM_CFG_SIGN_EXTEND_ENABLED;
169
        config |= LM_CFG_USER_ENABLED;
170
        config |= LM_CFG_ICACHE_ENABLED;
171
        config |= LM_CFG_DCACHE_ENABLED;
172
        config |= LM_CFG_BREAK_ENABLED;
173
        break;
174
      default:
175
        return 0;
176
    }
177
  return 1;
178
}
179
 
180
/* Do any architecture specific initialisation.  */
181
 
182
void
183
md_begin (void)
184
{
185
  /* Initialize the `cgen' interface.  */
186
 
187
  /* Set the machine number and endian.  */
188
  gas_cgen_cpu_desc = lm32_cgen_cpu_open (CGEN_CPU_OPEN_MACHS, 0,
189
                                           CGEN_CPU_OPEN_ENDIAN,
190
                                           CGEN_ENDIAN_BIG,
191
                                           CGEN_CPU_OPEN_END);
192
  lm32_cgen_init_asm (gas_cgen_cpu_desc);
193
 
194
  /* This is a callback from cgen to gas to parse operands.  */
195
  cgen_set_parse_operand_fn (gas_cgen_cpu_desc, gas_cgen_parse_operand);
196
}
197
 
198
/* Turn an integer of n bytes (in val) into a stream of bytes appropriate
199
   for use in the a.out file, and stores them in the array pointed to by buf. */
200
 
201
void
202
md_number_to_chars (char * buf, valueT val, int n)
203
{
204
  if (target_big_endian)
205
    number_to_chars_bigendian (buf, val, n);
206
  else
207
    number_to_chars_littleendian (buf, val, n);
208
}
209
 
210
/* Turn a string in input_line_pointer into a floating point constant
211
   of type TYPE, and store the appropriate bytes in *LITP.  The number
212
   of LITTLENUMS emitted is stored in *SIZEP.  An error message is
213
   returned, or NULL on OK.  */
214
 
215
char *
216
md_atof (int type, char *litP, int *sizeP)
217
{
218
  int i;
219
  int prec;
220
  LITTLENUM_TYPE words[4];
221
 
222
  char *t;
223
 
224
  switch (type)
225
    {
226
    case 'f':
227
      prec = 2;
228
      break;
229
    case 'd':
230
      prec = 4;
231
      break;
232
    default:
233
      *sizeP = 0;
234
      return _("bad call to md_atof");
235
    }
236
 
237
  t = atof_ieee (input_line_pointer, type, words);
238
  if (t)
239
    input_line_pointer = t;
240
 
241
  *sizeP = prec * sizeof (LITTLENUM_TYPE);
242
 
243
  if (target_big_endian)
244
    {
245
      for (i = 0; i < prec; i++)
246
        {
247
          md_number_to_chars (litP, (valueT) words[i],
248
                              sizeof (LITTLENUM_TYPE));
249
          litP += sizeof (LITTLENUM_TYPE);
250
        }
251
    }
252
  else
253
    {
254
      for (i = prec - 1; i >= 0; i--)
255
        {
256
          md_number_to_chars (litP, (valueT) words[i],
257
                              sizeof (LITTLENUM_TYPE));
258
          litP += sizeof (LITTLENUM_TYPE);
259
        }
260
    }
261
 
262
  return NULL;
263
}
264
 
265
/* Called for each undefined symbol. */
266
 
267
symbolS *
268
md_undefined_symbol (char * name ATTRIBUTE_UNUSED)
269
{
270
  return 0;
271
}
272
 
273
/* Round up a section size to the appropriate boundary.  */
274
 
275
valueT
276
md_section_align (asection *seg, valueT addr)
277
{
278
  int align = bfd_get_section_alignment (stdoutput, seg);
279
  return ((addr + (1 << align) - 1) & (-1 << align));
280
}
281
 
282
/* This function assembles the instructions. It emits the frags/bytes to the
283
   sections and creates the relocation entries.  */
284
 
285
void
286
md_assemble (char * str)
287
{
288
  lm32_insn insn;
289
  char * errmsg;
290
 
291
  /* Initialize GAS's cgen interface for a new instruction.  */
292
  gas_cgen_init_parse ();
293
 
294
  insn.insn = lm32_cgen_assemble_insn
295
      (gas_cgen_cpu_desc, str, &insn.fields, insn.buffer, &errmsg);
296
 
297
  if (!insn.insn)
298
    {
299
      as_bad ("%s", errmsg);
300
      return;
301
    }
302
 
303
  gas_cgen_finish_insn (insn.insn, insn.buffer,
304
                        CGEN_FIELDS_BITSIZE (&insn.fields), 1, NULL);
305
}
306
 
307
/* Return the bfd reloc type for OPERAND of INSN at fixup FIXP.
308
   Returns BFD_RELOC_NONE if no reloc type can be found.
309
   *FIXP may be modified if desired.  */
310
 
311
bfd_reloc_code_real_type
312
md_cgen_lookup_reloc (const CGEN_INSN *insn ATTRIBUTE_UNUSED,
313
                      const CGEN_OPERAND *operand,
314
                      fixS *fixP ATTRIBUTE_UNUSED)
315
{
316
  switch (operand->type)
317
    {
318
    case LM32_OPERAND_GOT16:
319
      return BFD_RELOC_LM32_16_GOT;
320
    case LM32_OPERAND_GOTOFFHI16:
321
      return BFD_RELOC_LM32_GOTOFF_HI16;
322
    case LM32_OPERAND_GOTOFFLO16:
323
      return BFD_RELOC_LM32_GOTOFF_LO16;
324
    case LM32_OPERAND_GP16:
325
      return BFD_RELOC_GPREL16;
326
    case LM32_OPERAND_LO16:
327
      return BFD_RELOC_LO16;
328
    case LM32_OPERAND_HI16:
329
      return BFD_RELOC_HI16;
330
    case LM32_OPERAND_BRANCH:
331
      return BFD_RELOC_LM32_BRANCH;
332
    case LM32_OPERAND_CALL:
333
      return BFD_RELOC_LM32_CALL;
334
    default:
335
      break;
336
    }
337
  return BFD_RELOC_NONE;
338
}
339
 
340
/* Return the position from which the PC relative adjustment for a PC relative
341
   fixup should be made.  */
342
 
343
long
344
md_pcrel_from (fixS *fixP)
345
{
346
  /* Shouldn't get called.  */
347
  abort ();
348
  /* Return address of current instruction.  */
349
  return fixP->fx_where + fixP->fx_frag->fr_address;
350
}
351
 
352
/* The location from which a PC relative jump should be calculated,
353
   given a PC relative reloc.  */
354
 
355
long
356
md_pcrel_from_section (fixS * fixP, segT sec)
357
{
358
  if ((fixP->fx_addsy != (symbolS *) NULL)
359
      && (! S_IS_DEFINED (fixP->fx_addsy)
360
          || (S_GET_SEGMENT (fixP->fx_addsy) != sec)))
361
    {
362
      /* The symbol is undefined (or is defined but not in this section).
363
         Let the linker figure it out.  */
364
      return 0;
365
    }
366
 
367
  /*fprintf(stderr, "%s extern %d local %d\n", S_GET_NAME (fixP->fx_addsy), S_IS_EXTERN (fixP->fx_addsy), S_IS_LOCAL (fixP->fx_addsy));*/
368
  /* FIXME: Weak problem? */
369
  if ((fixP->fx_addsy != (symbolS *) NULL)
370
      && S_IS_EXTERNAL (fixP->fx_addsy))
371
    {
372
      /* If the symbol is external, let the linker handle it.  */
373
      return 0;
374
    }
375
 
376
  return fixP->fx_where + fixP->fx_frag->fr_address;
377
}
378
 
379
/* Return true if we can partially resolve a relocation now.  */
380
 
381
bfd_boolean
382
lm32_fix_adjustable (fixS * fixP)
383
{
384
  /* We need the symbol name for the VTABLE entries */
385
  if (fixP->fx_r_type == BFD_RELOC_VTABLE_INHERIT
386
      || fixP->fx_r_type == BFD_RELOC_VTABLE_ENTRY)
387
    return FALSE;
388
 
389
  return TRUE;
390
}
391
 
392
/* Relaxation isn't required/supported on this target.  */
393
 
394
int
395
md_estimate_size_before_relax (fragS *fragp ATTRIBUTE_UNUSED,
396
                               asection *seg ATTRIBUTE_UNUSED)
397
{
398
  abort ();
399
  return 0;
400
}
401
 
402
void
403
md_convert_frag (bfd *abfd ATTRIBUTE_UNUSED,
404
                 asection *sec ATTRIBUTE_UNUSED,
405
                 fragS *fragP ATTRIBUTE_UNUSED)
406
{
407
  abort ();
408
}
409
 
410
void
411
md_apply_fix (fixS * fixP, valueT * valP, segT seg)
412
{
413
  /* Fix for weak symbols. Why do we have fx_addsy for weak symbols?  */
414
  if (fixP->fx_addsy != NULL && S_IS_WEAK (fixP->fx_addsy))
415
    *valP = 0;
416
 
417
  gas_cgen_md_apply_fix (fixP, valP, seg);
418
  return;
419
}

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