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[/] [openrisc/] [trunk/] [gnu-src/] [binutils-2.18.50/] [gas/] [config/] [tc-fr30.c] - Blame information for rev 156

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/* tc-fr30.c -- Assembler for the Fujitsu FR30.
2
   Copyright 1998, 1999, 2000, 2001, 2002, 2003, 2005, 2006, 2007
3
   Free Software Foundation, Inc.
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 3, 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
18
   along with GAS; see the file COPYING.  If not, write to
19
   the Free Software Foundation, 51 Franklin Street - Fifth Floor,
20
   Boston, MA 02110-1301, USA.  */
21
 
22
#include "as.h"
23
#include "safe-ctype.h"
24
#include "subsegs.h"
25
#include "symcat.h"
26
#include "opcodes/fr30-desc.h"
27
#include "opcodes/fr30-opc.h"
28
#include "cgen.h"
29
 
30
/* Structure to hold all of the different components describing
31
   an individual instruction.  */
32
typedef struct
33
{
34
  const CGEN_INSN *     insn;
35
  const CGEN_INSN *     orig_insn;
36
  CGEN_FIELDS           fields;
37
#if CGEN_INT_INSN_P
38
  CGEN_INSN_INT         buffer [1];
39
#define INSN_VALUE(buf) (*(buf))
40
#else
41
  unsigned char         buffer [CGEN_MAX_INSN_SIZE];
42
#define INSN_VALUE(buf) (buf)
43
#endif
44
  char *                addr;
45
  fragS *               frag;
46
  int                   num_fixups;
47
  fixS *                fixups [GAS_CGEN_MAX_FIXUPS];
48
  int                   indices [MAX_OPERAND_INSTANCES];
49
}
50
fr30_insn;
51
 
52
const char comment_chars[]        = ";";
53
const char line_comment_chars[]   = "#";
54
const char line_separator_chars[] = "|";
55
const char EXP_CHARS[]            = "eE";
56
const char FLT_CHARS[]            = "dD";
57
 
58
#define FR30_SHORTOPTS ""
59
const char * md_shortopts = FR30_SHORTOPTS;
60
 
61
struct option md_longopts[] =
62
{
63
  {NULL, no_argument, NULL, 0}
64
};
65
size_t md_longopts_size = sizeof (md_longopts);
66
 
67
int
68
md_parse_option (int c ATTRIBUTE_UNUSED,
69
                 char *arg ATTRIBUTE_UNUSED)
70
{
71
  switch (c)
72
    {
73
    default:
74
      return 0;
75
    }
76
  return 1;
77
}
78
 
79
void
80
md_show_usage (FILE * stream)
81
{
82
  fprintf (stream, _(" FR30 specific command line options:\n"));
83
}
84
 
85
/* The target specific pseudo-ops which we support.  */
86
const pseudo_typeS md_pseudo_table[] =
87
{
88
  { "word",     cons,           4 },
89
  { NULL,       NULL,           0 }
90
};
91
 
92
 
93
void
94
md_begin (void)
95
{
96
  /* Initialize the `cgen' interface.  */
97
 
98
  /* Set the machine number and endian.  */
99
  gas_cgen_cpu_desc = fr30_cgen_cpu_open (CGEN_CPU_OPEN_MACHS, 0,
100
                                          CGEN_CPU_OPEN_ENDIAN,
101
                                          CGEN_ENDIAN_BIG,
102
                                          CGEN_CPU_OPEN_END);
103
  fr30_cgen_init_asm (gas_cgen_cpu_desc);
104
 
105
  /* This is a callback from cgen to gas to parse operands.  */
106
  cgen_set_parse_operand_fn (gas_cgen_cpu_desc, gas_cgen_parse_operand);
107
}
108
 
109
void
110
md_assemble (char *str)
111
{
112
  static int last_insn_had_delay_slot = 0;
113
  fr30_insn insn;
114
  char *errmsg;
115
 
116
  /* Initialize GAS's cgen interface for a new instruction.  */
117
  gas_cgen_init_parse ();
118
 
119
  insn.insn = fr30_cgen_assemble_insn
120
    (gas_cgen_cpu_desc, str, & insn.fields, insn.buffer, & errmsg);
121
 
122
  if (!insn.insn)
123
    {
124
      as_bad (errmsg);
125
      return;
126
    }
127
 
128
  /* Doesn't really matter what we pass for RELAX_P here.  */
129
  gas_cgen_finish_insn (insn.insn, insn.buffer,
130
                        CGEN_FIELDS_BITSIZE (& insn.fields), 1, NULL);
131
 
132
  /* Warn about invalid insns in delay slots.  */
133
  if (last_insn_had_delay_slot
134
      && CGEN_INSN_ATTR_VALUE (insn.insn, CGEN_INSN_NOT_IN_DELAY_SLOT))
135
    as_warn (_("Instruction %s not allowed in a delay slot."),
136
             CGEN_INSN_NAME (insn.insn));
137
 
138
  last_insn_had_delay_slot
139
    = CGEN_INSN_ATTR_VALUE (insn.insn, CGEN_INSN_DELAY_SLOT);
140
}
141
 
142
/* The syntax in the manual says constants begin with '#'.
143
   We just ignore it.  */
144
 
145
void
146
md_operand (expressionS * expressionP)
147
{
148
  if (* input_line_pointer == '#')
149
    {
150
      input_line_pointer ++;
151
      expression (expressionP);
152
    }
153
}
154
 
155
valueT
156
md_section_align (segT segment, valueT size)
157
{
158
  int align = bfd_get_section_alignment (stdoutput, segment);
159
 
160
  return ((size + (1 << align) - 1) & (-1 << align));
161
}
162
 
163
symbolS *
164
md_undefined_symbol (char *name ATTRIBUTE_UNUSED)
165
{
166
  return NULL;
167
}
168
 
169
/* Interface to relax_segment.  */
170
 
171
/* FIXME: Build table by hand, get it working, then machine generate.  */
172
 
173
const relax_typeS md_relax_table[] =
174
{
175
/* The fields are:
176
   1) most positive reach of this state,
177
   2) most negative reach of this state,
178
   3) how many bytes this mode will add to the size of the current frag
179
   4) which index into the table to try if we can't fit into this one.  */
180
 
181
  /* The first entry must be unused because an `rlx_more' value of zero ends
182
     each list.  */
183
  {1, 1, 0, 0},
184
 
185
  /* The displacement used by GAS is from the end of the 2 byte insn,
186
     so we subtract 2 from the following.  */
187
  /* 16 bit insn, 8 bit disp -> 10 bit range.
188
     This doesn't handle a branch in the right slot at the border:
189
     the "& -4" isn't taken into account.  It's not important enough to
190
     complicate things over it, so we subtract an extra 2 (or + 2 in -ve
191
     case).  */
192
  {511 - 2 - 2, -512 - 2 + 2, 0, 2 },
193
  /* 32 bit insn, 24 bit disp -> 26 bit range.  */
194
  {0x2000000 - 1 - 2, -0x2000000 - 2, 2, 0 },
195
  /* Same thing, but with leading nop for alignment.  */
196
  {0x2000000 - 1 - 2, -0x2000000 - 2, 4, 0 }
197
};
198
 
199
/* Return an initial guess of the length by which a fragment must grow to
200
   hold a branch to reach its destination.
201
   Also updates fr_type/fr_subtype as necessary.
202
 
203
   Called just before doing relaxation.
204
   Any symbol that is now undefined will not become defined.
205
   The guess for fr_var is ACTUALLY the growth beyond fr_fix.
206
   Whatever we do to grow fr_fix or fr_var contributes to our returned value.
207
   Although it may not be explicit in the frag, pretend fr_var starts with a
208
 
209
 
210
int
211
md_estimate_size_before_relax (fragS * fragP, segT segment)
212
{
213
  /* The only thing we have to handle here are symbols outside of the
214
     current segment.  They may be undefined or in a different segment in
215
     which case linker scripts may place them anywhere.
216
     However, we can't finish the fragment here and emit the reloc as insn
217
     alignment requirements may move the insn about.  */
218
 
219
  if (S_GET_SEGMENT (fragP->fr_symbol) != segment)
220
    {
221
      /* The symbol is undefined in this segment.
222
         Change the relaxation subtype to the max allowable and leave
223
         all further handling to md_convert_frag.  */
224
      fragP->fr_subtype = 2;
225
 
226
      {
227
        const CGEN_INSN * insn;
228
        int               i;
229
 
230
        /* Update the recorded insn.
231
           Fortunately we don't have to look very far.
232
           FIXME: Change this to record in the instruction the next higher
233
           relaxable insn to use.  */
234
        for (i = 0, insn = fragP->fr_cgen.insn; i < 4; i++, insn++)
235
          {
236
            if ((strcmp (CGEN_INSN_MNEMONIC (insn),
237
                         CGEN_INSN_MNEMONIC (fragP->fr_cgen.insn))
238
                 == 0)
239
                && CGEN_INSN_ATTR_VALUE (insn, CGEN_INSN_RELAXED))
240
              break;
241
          }
242
        if (i == 4)
243
          abort ();
244
 
245
        fragP->fr_cgen.insn = insn;
246
        return 2;
247
      }
248
    }
249
 
250
  /* Return the size of the variable part of the frag.  */
251
  return md_relax_table[fragP->fr_subtype].rlx_length;
252
}
253
 
254
/* *fragP has been relaxed to its final size, and now needs to have
255
   the bytes inside it modified to conform to the new size.
256
 
257
   Called after relaxation is finished.
258
   fragP->fr_type == rs_machine_dependent.
259
   fragP->fr_subtype is the subtype of what the address relaxed to.  */
260
 
261
void
262
md_convert_frag (bfd *abfd ATTRIBUTE_UNUSED,
263
                 segT sec ATTRIBUTE_UNUSED,
264
                 fragS *fragP ATTRIBUTE_UNUSED)
265
{
266
}
267
 
268
/* Functions concerning relocs.  */
269
 
270
/* The location from which a PC relative jump should be calculated,
271
   given a PC relative reloc.  */
272
 
273
long
274
md_pcrel_from_section (fixS * fixP, segT sec)
275
{
276
  if (fixP->fx_addsy != (symbolS *) NULL
277
      && (! S_IS_DEFINED (fixP->fx_addsy)
278
          || S_GET_SEGMENT (fixP->fx_addsy) != sec))
279
    /* The symbol is undefined (or is defined but not in this section).
280
       Let the linker figure it out.  */
281
    return 0;
282
 
283
  return (fixP->fx_frag->fr_address + fixP->fx_where) & ~1;
284
}
285
 
286
/* Return the bfd reloc type for OPERAND of INSN at fixup FIXP.
287
   Returns BFD_RELOC_NONE if no reloc type can be found.
288
   *FIXP may be modified if desired.  */
289
 
290
bfd_reloc_code_real_type
291
md_cgen_lookup_reloc (const CGEN_INSN *insn ATTRIBUTE_UNUSED,
292
                      const CGEN_OPERAND *operand,
293
                      fixS *fixP)
294
{
295
  switch (operand->type)
296
    {
297
    case FR30_OPERAND_LABEL9:  fixP->fx_pcrel = 1; return BFD_RELOC_FR30_9_PCREL;
298
    case FR30_OPERAND_LABEL12: fixP->fx_pcrel = 1; return BFD_RELOC_FR30_12_PCREL;
299
    case FR30_OPERAND_DISP10:  return BFD_RELOC_FR30_10_IN_8;
300
    case FR30_OPERAND_DISP9:   return BFD_RELOC_FR30_9_IN_8;
301
    case FR30_OPERAND_DISP8:   return BFD_RELOC_FR30_8_IN_8;
302
    case FR30_OPERAND_UDISP6:  return BFD_RELOC_FR30_6_IN_4;
303
    case FR30_OPERAND_I8:      return BFD_RELOC_8;
304
    case FR30_OPERAND_I32:     return BFD_RELOC_FR30_48;
305
    case FR30_OPERAND_I20:     return BFD_RELOC_FR30_20;
306
    default : /* Avoid -Wall warning.  */
307
      break;
308
    }
309
 
310
  return BFD_RELOC_NONE;
311
}
312
 
313
/* Write a value out to the object file, using the appropriate endianness.  */
314
 
315
void
316
md_number_to_chars (char * buf, valueT val, int n)
317
{
318
  number_to_chars_bigendian (buf, val, n);
319
}
320
 
321
char *
322
md_atof (int type, char * litP, int * sizeP)
323
{
324
  return ieee_md_atof (type, litP, sizeP, TRUE);
325
}
326
 
327
/* Worker function for fr30_is_colon_insn().  */
328
static char
329
restore_colon (int advance_i_l_p_by)
330
{
331
  char c;
332
 
333
  /* Restore the colon, and advance input_line_pointer to
334
     the end of the new symbol.  */
335
  * input_line_pointer = ':';
336
  input_line_pointer += advance_i_l_p_by;
337
  c = * input_line_pointer;
338
  * input_line_pointer = 0;
339
 
340
  return c;
341
}
342
 
343
/* Determines if the symbol starting at START and ending in
344
   a colon that was at the location pointed to by INPUT_LINE_POINTER
345
   (but which has now been replaced bu a NUL) is in fact an
346
   LDI:8, LDI:20, LDI:32, CALL:D. JMP:D, RET:D or Bcc:D instruction.
347
   If it is, then it restores the colon, advances INPUT_LINE_POINTER
348
   to the real end of the instruction/symbol, and returns the character
349
   that really terminated the symbol.  Otherwise it returns 0.  */
350
char
351
fr30_is_colon_insn (char *  start)
352
{
353
  char * i_l_p = input_line_pointer;
354
 
355
  /* Check to see if the symbol parsed so far is 'ldi'.  */
356
  if (   (start[0] != 'l' && start[0] != 'L')
357
      || (start[1] != 'd' && start[1] != 'D')
358
      || (start[2] != 'i' && start[2] != 'I')
359
      || start[3] != 0)
360
    {
361
      /* Nope - check to see a 'd' follows the colon.  */
362
      if (   (i_l_p[1] == 'd' || i_l_p[1] == 'D')
363
          && (i_l_p[2] == ' ' || i_l_p[2] == '\t' || i_l_p[2] == '\n'))
364
        {
365
          /* Yup - it might be delay slot instruction.  */
366
          int           i;
367
          static char * delay_insns [] =
368
          {
369
            "call", "jmp", "ret", "bra", "bno",
370
            "beq",  "bne", "bc",  "bnc", "bn",
371
            "bp",   "bv",  "bnv", "blt", "bge",
372
            "ble",  "bgt", "bls", "bhi"
373
          };
374
 
375
          for (i = sizeof (delay_insns) / sizeof (delay_insns[0]); i--;)
376
            {
377
              char * insn = delay_insns[i];
378
              int    len  = strlen (insn);
379
 
380
              if (start [len] != 0)
381
                continue;
382
 
383
              while (len --)
384
                if (TOLOWER (start [len]) != insn [len])
385
                  break;
386
 
387
              if (len == -1)
388
                return restore_colon (1);
389
            }
390
        }
391
 
392
      /* Nope - it is a normal label.  */
393
      return 0;
394
    }
395
 
396
  /* Check to see if the text following the colon is '8'.  */
397
  if (i_l_p[1] == '8' && (i_l_p[2] == ' ' || i_l_p[2] == '\t'))
398
    return restore_colon (2);
399
 
400
  /* Check to see if the text following the colon is '20'.  */
401
  else if (i_l_p[1] == '2' && i_l_p[2] =='0' && (i_l_p[3] == ' ' || i_l_p[3] == '\t'))
402
    return restore_colon (3);
403
 
404
  /* Check to see if the text following the colon is '32'.  */
405
  else if (i_l_p[1] == '3' && i_l_p[2] =='2' && (i_l_p[3] == ' ' || i_l_p[3] == '\t'))
406
    return restore_colon (3);
407
 
408
  return 0;
409
}
410
 
411
bfd_boolean
412
fr30_fix_adjustable (fixS * fixP)
413
{
414
  /* We need the symbol name for the VTABLE entries.  */
415
  if (fixP->fx_r_type == BFD_RELOC_VTABLE_INHERIT
416
      || fixP->fx_r_type == BFD_RELOC_VTABLE_ENTRY)
417
    return 0;
418
 
419
  return 1;
420
}

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