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[/] [openrisc/] [trunk/] [gnu-old/] [binutils-2.18.50/] [gas/] [config/] [tc-openrisc.c] - Blame information for rev 816

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/* tc-openrisc.c -- Assembler for the OpenRISC family.
2
   Copyright 2001, 2002, 2003, 2005, 2006, 2007 Free Software Foundation.
3
   Contributed by Johan Rydberg, jrydberg@opencores.org
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 "subsegs.h"
24
#include "symcat.h"
25
#include "opcodes/openrisc-desc.h"
26
#include "opcodes/openrisc-opc.h"
27
#include "cgen.h"
28
 
29
/* Structure to hold all of the different components describing
30
   an individual instruction.  */
31
typedef struct openrisc_insn openrisc_insn;
32
 
33
struct openrisc_insn
34
{
35
  const CGEN_INSN *     insn;
36
  const CGEN_INSN *     orig_insn;
37
  CGEN_FIELDS           fields;
38
#if CGEN_INT_INSN_P
39
  CGEN_INSN_INT         buffer [1];
40
#define INSN_VALUE(buf) (*(buf))
41
#else
42
  unsigned char         buffer [CGEN_MAX_INSN_SIZE];
43
#define INSN_VALUE(buf) (buf)
44
#endif
45
  char *                addr;
46
  fragS *               frag;
47
  int                   num_fixups;
48
  fixS *                fixups [GAS_CGEN_MAX_FIXUPS];
49
  int                   indices [MAX_OPERAND_INSTANCES];
50
};
51
 
52
 
53
const char comment_chars[]        = "#";
54
const char line_comment_chars[]   = "#";
55
const char line_separator_chars[] = ";";
56
const char EXP_CHARS[]            = "eE";
57
const char FLT_CHARS[]            = "dD";
58
 
59
 
60
#define OPENRISC_SHORTOPTS "m:"
61
const char * md_shortopts = OPENRISC_SHORTOPTS;
62
 
63
struct option md_longopts[] =
64
{
65
  {NULL, no_argument, NULL, 0}
66
};
67
size_t md_longopts_size = sizeof (md_longopts);
68
 
69
unsigned long openrisc_machine = 0; /* default */
70
 
71
int
72
md_parse_option (int c ATTRIBUTE_UNUSED, char * arg ATTRIBUTE_UNUSED)
73
{
74
  return 0;
75
}
76
 
77
void
78
md_show_usage (FILE * stream ATTRIBUTE_UNUSED)
79
{
80
}
81
 
82
static void
83
ignore_pseudo (int val ATTRIBUTE_UNUSED)
84
{
85
  discard_rest_of_line ();
86
}
87
 
88
const char openrisc_comment_chars [] = ";#";
89
 
90
/* The target specific pseudo-ops which we support.  */
91
const pseudo_typeS md_pseudo_table[] =
92
{
93
  { "word",     cons,           4 },
94
  { "proc",     ignore_pseudo,  0 },
95
  { "endproc",  ignore_pseudo,  0 },
96
  { NULL,       NULL,           0 }
97
};
98
 
99
 
100
 
101
void
102
md_begin (void)
103
{
104
  /* Initialize the `cgen' interface.  */
105
 
106
  /* Set the machine number and endian.  */
107
  gas_cgen_cpu_desc = openrisc_cgen_cpu_open (CGEN_CPU_OPEN_MACHS, 0,
108
                                              CGEN_CPU_OPEN_ENDIAN,
109
                                              CGEN_ENDIAN_BIG,
110
                                              CGEN_CPU_OPEN_END);
111
  openrisc_cgen_init_asm (gas_cgen_cpu_desc);
112
 
113
  /* This is a callback from cgen to gas to parse operands.  */
114
  cgen_set_parse_operand_fn (gas_cgen_cpu_desc, gas_cgen_parse_operand);
115
}
116
 
117
void
118
md_assemble (char * str)
119
{
120
  static int last_insn_had_delay_slot = 0;
121
  openrisc_insn insn;
122
  char *    errmsg;
123
 
124
  /* Initialize GAS's cgen interface for a new instruction.  */
125
  gas_cgen_init_parse ();
126
 
127
  insn.insn = openrisc_cgen_assemble_insn
128
    (gas_cgen_cpu_desc, str, & insn.fields, insn.buffer, & errmsg);
129
 
130
  if (!insn.insn)
131
    {
132
      as_bad (errmsg);
133
      return;
134
    }
135
 
136
  /* Doesn't really matter what we pass for RELAX_P here.  */
137
  gas_cgen_finish_insn (insn.insn, insn.buffer,
138
                        CGEN_FIELDS_BITSIZE (& insn.fields), 1, NULL);
139
 
140
  last_insn_had_delay_slot
141
    = CGEN_INSN_ATTR_VALUE (insn.insn, CGEN_INSN_DELAY_SLOT);
142
}
143
 
144
 
145
/* The syntax in the manual says constants begin with '#'.
146
   We just ignore it.  */
147
 
148
void
149
md_operand (expressionS * expressionP)
150
{
151
  if (* input_line_pointer == '#')
152
    {
153
      input_line_pointer ++;
154
      expression (expressionP);
155
    }
156
}
157
 
158
valueT
159
md_section_align (segT segment, valueT size)
160
{
161
  int align = bfd_get_section_alignment (stdoutput, segment);
162
  return ((size + (1 << align) - 1) & (-1 << align));
163
}
164
 
165
symbolS *
166
md_undefined_symbol (char * name ATTRIBUTE_UNUSED)
167
{
168
  return 0;
169
}
170
 
171
 
172
/* Interface to relax_segment.  */
173
 
174
/* FIXME: Look through this.  */
175
 
176
const relax_typeS md_relax_table[] =
177
{
178
/* The fields are:
179
   1) most positive reach of this state,
180
   2) most negative reach of this state,
181
   3) how many bytes this mode will add to the size of the current frag
182
   4) which index into the table to try if we can't fit into this one.  */
183
 
184
  /* The first entry must be unused because an `rlx_more' value of zero ends
185
     each list.  */
186
  {1, 1, 0, 0},
187
 
188
  /* The displacement used by GAS is from the end of the 2 byte insn,
189
     so we subtract 2 from the following.  */
190
  /* 16 bit insn, 8 bit disp -> 10 bit range.
191
     This doesn't handle a branch in the right slot at the border:
192
     the "& -4" isn't taken into account.  It's not important enough to
193
     complicate things over it, so we subtract an extra 2 (or + 2 in -ve
194
     case).  */
195
  {511 - 2 - 2, -512 - 2 + 2, 0, 2 },
196
  /* 32 bit insn, 24 bit disp -> 26 bit range.  */
197
  {0x2000000 - 1 - 2, -0x2000000 - 2, 2, 0 },
198
  /* Same thing, but with leading nop for alignment.  */
199
  {0x2000000 - 1 - 2, -0x2000000 - 2, 4, 0 }
200
};
201
 
202
/* Return an initial guess of the length by which a fragment must grow to
203
   hold a branch to reach its destination.
204
   Also updates fr_type/fr_subtype as necessary.
205
 
206
   Called just before doing relaxation.
207
   Any symbol that is now undefined will not become defined.
208
   The guess for fr_var is ACTUALLY the growth beyond fr_fix.
209
   Whatever we do to grow fr_fix or fr_var contributes to our returned value.
210
   Although it may not be explicit in the frag, pretend fr_var starts with a
211
 
212
 
213
int
214
md_estimate_size_before_relax (fragS * fragP, segT segment)
215
{
216
  /* The only thing we have to handle here are symbols outside of the
217
     current segment.  They may be undefined or in a different segment in
218
     which case linker scripts may place them anywhere.
219
     However, we can't finish the fragment here and emit the reloc as insn
220
     alignment requirements may move the insn about.  */
221
 
222
  if (S_GET_SEGMENT (fragP->fr_symbol) != segment)
223
    {
224
      /* The symbol is undefined in this segment.
225
         Change the relaxation subtype to the max allowable and leave
226
         all further handling to md_convert_frag.  */
227
      fragP->fr_subtype = 2;
228
 
229
      {
230
        const CGEN_INSN * insn;
231
        int               i;
232
 
233
        /* Update the recorded insn.
234
           Fortunately we don't have to look very far.
235
           FIXME: Change this to record in the instruction the next higher
236
           relaxable insn to use.  */
237
        for (i = 0, insn = fragP->fr_cgen.insn; i < 4; i++, insn++)
238
          {
239
            if ((strcmp (CGEN_INSN_MNEMONIC (insn),
240
                         CGEN_INSN_MNEMONIC (fragP->fr_cgen.insn))
241
                 == 0)
242
                && CGEN_INSN_ATTR_VALUE (insn, CGEN_INSN_RELAXED))
243
              break;
244
          }
245
        if (i == 4)
246
          abort ();
247
 
248
        fragP->fr_cgen.insn = insn;
249
        return 2;
250
      }
251
    }
252
 
253
  return md_relax_table[fragP->fr_subtype].rlx_length;
254
}
255
 
256
/* *fragP has been relaxed to its final size, and now needs to have
257
   the bytes inside it modified to conform to the new size.
258
 
259
   Called after relaxation is finished.
260
   fragP->fr_type == rs_machine_dependent.
261
   fragP->fr_subtype is the subtype of what the address relaxed to.  */
262
 
263
void
264
md_convert_frag (bfd *   abfd ATTRIBUTE_UNUSED,
265
                 segT    sec  ATTRIBUTE_UNUSED,
266
                 fragS * fragP ATTRIBUTE_UNUSED)
267
{
268
  /* FIXME */
269
}
270
 
271
 
272
/* Functions concerning relocs.  */
273
 
274
/* The location from which a PC relative jump should be calculated,
275
   given a PC relative reloc.  */
276
 
277
long
278
md_pcrel_from_section (fixS * fixP, segT sec)
279
{
280
  if (fixP->fx_addsy != (symbolS *) NULL
281
      && (! S_IS_DEFINED (fixP->fx_addsy)
282
          || S_GET_SEGMENT (fixP->fx_addsy) != sec))
283
    /* The symbol is undefined (or is defined but not in this section).
284
       Let the linker figure it out.  */
285
    return 0;
286
 
287
  return (fixP->fx_frag->fr_address + fixP->fx_where) & ~1;
288
}
289
 
290
 
291
/* Return the bfd reloc type for OPERAND of INSN at fixup FIXP.
292
   Returns BFD_RELOC_NONE if no reloc type can be found.
293
   *FIXP may be modified if desired.  */
294
 
295
bfd_reloc_code_real_type
296
md_cgen_lookup_reloc (const CGEN_INSN *    insn ATTRIBUTE_UNUSED,
297
                      const CGEN_OPERAND * operand,
298
                      fixS *               fixP)
299
{
300
  bfd_reloc_code_real_type type;
301
 
302
  switch (operand->type)
303
    {
304
    case OPENRISC_OPERAND_ABS_26:
305
      fixP->fx_pcrel = 0;
306
      type = BFD_RELOC_OPENRISC_ABS_26;
307
      goto emit;
308
    case OPENRISC_OPERAND_DISP_26:
309
      fixP->fx_pcrel = 1;
310
      type = BFD_RELOC_OPENRISC_REL_26;
311
      goto emit;
312
 
313
    case OPENRISC_OPERAND_HI16:
314
      type = BFD_RELOC_HI16;
315
      goto emit;
316
 
317
    case OPENRISC_OPERAND_LO16:
318
      type = BFD_RELOC_LO16;
319
      goto emit;
320
 
321
    emit:
322
      return type;
323
 
324
    default : /* avoid -Wall warning */
325
      break;
326
    }
327
 
328
  return BFD_RELOC_NONE;
329
}
330
 
331
/* Write a value out to the object file, using the appropriate endianness.  */
332
 
333
void
334
md_number_to_chars (char * buf, valueT val, int n)
335
{
336
  number_to_chars_bigendian (buf, val, n);
337
}
338
 
339
/* Turn a string in input_line_pointer into a floating point constant of type
340
   type, and store the appropriate bytes in *litP.  The number of LITTLENUMS
341
   emitted is stored in *sizeP .  An error message is returned, or NULL on OK.
342
*/
343
 
344
/* Equal to MAX_PRECISION in atof-ieee.c */
345
#define MAX_LITTLENUMS 6
346
 
347
char *
348
md_atof (int type, char * litP, int *  sizeP)
349
{
350
  return ieee_md_atof (type, litP, sizeP, TRUE);
351
}
352
 
353
bfd_boolean
354
openrisc_fix_adjustable (fixS * fixP)
355
{
356
  /* We need the symbol name for the VTABLE entries.  */
357
  if (fixP->fx_r_type == BFD_RELOC_VTABLE_INHERIT
358
      || fixP->fx_r_type == BFD_RELOC_VTABLE_ENTRY)
359
    return 0;
360
 
361
  return 1;
362
}

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