aboutsummaryrefslogtreecommitdiff
path: root/bfd/aout-ns32k.c
blob: c1335aa84d7d522a98345dfb2c0bd16f405a1f29 (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
/* BFD back-end for ns32k a.out-ish binaries.
   Copyright (C) 1990, 91, 92, 94, 95, 96, 1998 Free Software Foundation, Inc.
   Contributed by Ian Dall (idall@eleceng.adelaide.edu.au).

This file is part of BFD, the Binary File Descriptor library.

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.  */

#define BYTES_IN_WORD 4

#include "bfd.h"
#include "aout/aout64.h"
#include "ns32k.h"

#define MYNS(OP) CAT(ns32kaout_,OP)
reloc_howto_type *
MYNS(bfd_reloc_type_lookup)
  PARAMS((bfd *abfd AND
	  bfd_reloc_code_real_type code));

boolean
MYNS(write_object_contents)
  PARAMS((bfd *abfd));

/* Avoid multiple definitions from aoutx if supporting standard a.out format(s)
 * as well as this one
 */
#define NAME(x,y) CAT3(ns32kaout,_32_,y)

void bfd_ns32k_arch PARAMS ((void));

#include "libaout.h"

#define MY(OP) MYNS(OP)

#define MY_swap_std_reloc_in MY(swap_std_reloc_in)
#define MY_swap_std_reloc_out MY(swap_std_reloc_out)

static void
MY_swap_std_reloc_in PARAMS ((bfd *abfd, struct reloc_std_external *bytes,
			      arelent *cache_ptr, asymbol **symbols,
			      bfd_size_type symcount));

static void
MY_swap_std_reloc_out PARAMS ((bfd *abfd, arelent *g,
			       struct reloc_std_external *natptr));

/* The ns32k series is ah, unusual, when it comes to relocation.
 * There are three storage methods for relocateable objects.  There
 * are displacements, immediate operands and ordinary twos complement
 * data. Of these, only the last fits into the standard relocation
 * scheme.  Immediate operands are stored huffman encoded and
 * immediate operands are stored big endian (where as the natural byte
 * order is little endian for this achitecture).

 * Note that the ns32k displacement storage method is orthogonal to
 * whether the relocation is pc relative or not. The "displacement"
 * storage scheme is used for essentially all address constants. The
 * displacement can be relative to zero (absolute displacement),
 * relative to the pc (pc relative), the stack pointer, the frame
 * pointer, the static base register and general purpose register etc.

 * For example:
 *
 *  sym1: .long .	# pc relative 2's complement
 *  sym1: .long foo	# 2's complement not pc relative
 *
 *  self:  movd @self, r0 # pc relative displacement
 *	   movd foo, r0 # non pc relative displacement
 *
 *  self:  movd self, r0 # pc relative immediate
 *         movd foo, r0 # non pc relative immediate
 *
 * In addition, for historical reasons the encoding of the relocation types
 * in the a.out format relocation entries is such that even the relocation
 * methods which are standard are not encoded the standard way.
 *
 */

reloc_howto_type MY(howto_table)[] = 
{
  /* ns32k immediate operands */
  HOWTO (BFD_RELOC_NS32K_IMM_8, 0, 0, 8, false, 0, true,
	 _bfd_ns32k_reloc_imm, "NS32K_IMM_8",
	 true, 0x000000ff,0x000000ff, false),
  HOWTO (BFD_RELOC_NS32K_IMM_16, 0, 1, 16, false, 0, true,
	 _bfd_ns32k_reloc_imm,  "NS32K_IMM_16",
	 true, 0x0000ffff,0x0000ffff, false),
  HOWTO (BFD_RELOC_NS32K_IMM_32, 0, 2, 32, false, 0, true,
	 _bfd_ns32k_reloc_imm, "NS32K_IMM_32",
	 true, 0xffffffff,0xffffffff, false),
  HOWTO (BFD_RELOC_NS32K_IMM_8_PCREL, 0, 0, 8, true, 0, false,
	 _bfd_ns32k_reloc_imm, "PCREL_NS32K_IMM_8",
	 true, 0x000000ff, 0x000000ff, false),
  HOWTO (BFD_RELOC_NS32K_IMM_16_PCREL, 0, 1, 16, true, 0, false,
	 _bfd_ns32k_reloc_imm, "PCREL_NS32K_IMM_16",
	 true, 0x0000ffff,0x0000ffff, false),
  HOWTO (BFD_RELOC_NS32K_IMM_32_PCREL, 0, 2, 32, true, 0, false,
	 _bfd_ns32k_reloc_imm, "PCREL_NS32K_IMM_32",
	 true, 0xffffffff,0xffffffff, false),

  /* ns32k displacements */
  HOWTO (BFD_RELOC_NS32K_DISP_8, 0, 0, 8, false, 0, true,
	 _bfd_ns32k_reloc_disp, "NS32K_DISP_8",
	 true, 0x000000ff,0x000000ff, false),
  HOWTO (BFD_RELOC_NS32K_DISP_16, 0, 1, 16, false, 0, true,
	 _bfd_ns32k_reloc_disp, "NS32K_DISP_16",
	 true, 0x0000ffff, 0x0000ffff, false),
  HOWTO (BFD_RELOC_NS32K_DISP_32, 0, 2, 32, false, 0, true,
	 _bfd_ns32k_reloc_disp, "NS32K_DISP_32",
	 true, 0xffffffff, 0xffffffff, false),
  HOWTO (BFD_RELOC_NS32K_DISP_8_PCREL, 0, 0, 8, true, 0, false,
	 _bfd_ns32k_reloc_disp, "PCREL_NS32K_DISP_8",
	 true, 0x000000ff,0x000000ff, false),
  HOWTO (BFD_RELOC_NS32K_DISP_16_PCREL, 0, 1, 16, true, 0, false,
	 _bfd_ns32k_reloc_disp, "PCREL_NS32K_DISP_16",
	 true, 0x0000ffff,0x0000ffff, false),
  HOWTO (BFD_RELOC_NS32K_DISP_32_PCREL, 0, 2, 32, true, 0, false,
	 _bfd_ns32k_reloc_disp, "PCREL_NS32K_DISP_32",
	 true, 0xffffffff,0xffffffff, false),

  /* Normal 2's complement */
  HOWTO (BFD_RELOC_8, 0, 0, 8, false, 0, complain_overflow_bitfield,0,
	 "8", true, 0x000000ff,0x000000ff, false),
  HOWTO (BFD_RELOC_16, 0, 1, 16, false, 0, complain_overflow_bitfield,0,
	 "16", true, 0x0000ffff,0x0000ffff, false),
  HOWTO (BFD_RELOC_32, 0, 2, 32, false, 0, complain_overflow_bitfield,0,
	 "32", true, 0xffffffff,0xffffffff, false),
  HOWTO (BFD_RELOC_8_PCREL, 0, 0, 8, true, 0, complain_overflow_signed, 0,
	 "PCREL_8", true, 0x000000ff,0x000000ff, false),
  HOWTO (BFD_RELOC_16_PCREL, 0, 1, 16, true, 0, complain_overflow_signed, 0,
	 "PCREL_16", true, 0x0000ffff,0x0000ffff, false),
  HOWTO (BFD_RELOC_32_PCREL, 0, 2, 32, true, 0, complain_overflow_signed, 0,
	 "PCREL_32", true, 0xffffffff,0xffffffff, false),
};


#define CTOR_TABLE_RELOC_HOWTO(BFD) (MY(howto_table) + 14)

#define RELOC_STD_BITS_NS32K_TYPE_BIG 0x06
#define RELOC_STD_BITS_NS32K_TYPE_LITTLE 0x60
#define RELOC_STD_BITS_NS32K_TYPE_SH_BIG 1
#define RELOC_STD_BITS_NS32K_TYPE_SH_LITTLE 5

reloc_howto_type *
MY(reloc_howto)(abfd, rel, r_index, r_extern, r_pcrel)
     bfd *abfd;
     struct reloc_std_external *rel;
     int *r_index;
     int *r_extern;
     int *r_pcrel;
{
  unsigned int r_length;
  int r_ns32k_type;
/*  BFD_ASSERT(bfd_header_little_endian (abfd)); */
  *r_index =  ((rel->r_index[2] << 16)
	       | (rel->r_index[1] << 8)
	       |  rel->r_index[0] );
  *r_extern  = (0 != (rel->r_type[0] & RELOC_STD_BITS_EXTERN_LITTLE));
  *r_pcrel   = (0 != (rel->r_type[0] & RELOC_STD_BITS_PCREL_LITTLE));
  r_length  =  ((rel->r_type[0] & RELOC_STD_BITS_LENGTH_LITTLE)
		>> RELOC_STD_BITS_LENGTH_SH_LITTLE);
  r_ns32k_type  =  ((rel->r_type[0] & RELOC_STD_BITS_NS32K_TYPE_LITTLE)
		    >> RELOC_STD_BITS_NS32K_TYPE_SH_LITTLE);
  return (MY(howto_table) + r_length + 3 * (*r_pcrel) + 6 * r_ns32k_type);
}

#define MY_reloc_howto(BFD,REL,IN,EX,PC) MY(reloc_howto)(BFD, REL, &IN, &EX, &PC)

void
MY(put_reloc)(abfd, r_extern, r_index, value, howto, reloc)
     bfd *abfd;
     int r_extern;
     int r_index;
     long value;
     reloc_howto_type *howto;
     struct reloc_std_external *reloc;
{
  unsigned int r_length;
  int r_pcrel;
  int r_ns32k_type;
  PUT_WORD (abfd, value, reloc->r_address);
  r_length = howto->size ;	/* Size as a power of two */
  r_pcrel  = (int) howto->pc_relative; /* Relative to PC? */
  r_ns32k_type = (howto - MY(howto_table) )/6;
/*  BFD_ASSERT (bfd_header_little_endian (abfd)); */
  reloc->r_index[2] = r_index >> 16;
  reloc->r_index[1] = r_index >> 8;
  reloc->r_index[0] = r_index;
  reloc->r_type[0] =
    (r_extern?    RELOC_STD_BITS_EXTERN_LITTLE: 0)
      | (r_pcrel?     RELOC_STD_BITS_PCREL_LITTLE: 0)
	| (r_length <<  RELOC_STD_BITS_LENGTH_SH_LITTLE)
	  | (r_ns32k_type <<  RELOC_STD_BITS_NS32K_TYPE_SH_LITTLE);
}

#define MY_put_reloc(BFD, EXT, IDX, VAL, HOWTO, RELOC) \
  MY(put_reloc)(BFD, EXT, IDX, VAL, HOWTO, RELOC)

#define STAT_FOR_EXEC

#define MY_final_link_relocate _bfd_ns32k_final_link_relocate
#define MY_relocate_contents _bfd_ns32k_relocate_contents

#include <aoutx.h>

reloc_howto_type *
MY(bfd_reloc_type_lookup)(abfd,code)
     bfd *abfd;
     bfd_reloc_code_real_type code;
{

#define ENTRY(i,j)	case i: return &MY(howto_table)[j]

  int ext = obj_reloc_entry_size (abfd) == RELOC_EXT_SIZE;

  BFD_ASSERT(ext == 0);
  if (code == BFD_RELOC_CTOR)
    switch (bfd_get_arch_info (abfd)->bits_per_address)
      {
      case 32:
	code = BFD_RELOC_32;
	break;
      }
  switch (code)
    {
      ENTRY(BFD_RELOC_NS32K_IMM_8, 0);
      ENTRY(BFD_RELOC_NS32K_IMM_16, 1);
      ENTRY(BFD_RELOC_NS32K_IMM_32, 2);
      ENTRY(BFD_RELOC_NS32K_IMM_8_PCREL, 3);
      ENTRY(BFD_RELOC_NS32K_IMM_16_PCREL, 4);
      ENTRY(BFD_RELOC_NS32K_IMM_32_PCREL, 5);
      ENTRY(BFD_RELOC_NS32K_DISP_8, 6);
      ENTRY(BFD_RELOC_NS32K_DISP_16, 7);
      ENTRY(BFD_RELOC_NS32K_DISP_32, 8);
      ENTRY(BFD_RELOC_NS32K_DISP_8_PCREL, 9);
      ENTRY(BFD_RELOC_NS32K_DISP_16_PCREL, 10);
      ENTRY(BFD_RELOC_NS32K_DISP_32_PCREL, 11);
      ENTRY(BFD_RELOC_8, 12);
      ENTRY(BFD_RELOC_16, 13);
      ENTRY(BFD_RELOC_32, 14);
      ENTRY(BFD_RELOC_8_PCREL, 15);
      ENTRY(BFD_RELOC_16_PCREL, 16);
      ENTRY(BFD_RELOC_32_PCREL, 17);
    default: return (reloc_howto_type *) NULL;
    }
#undef ENTRY
}


static void
MY_swap_std_reloc_in (abfd, bytes, cache_ptr, symbols, symcount)
     bfd *abfd;
     struct reloc_std_external *bytes;
     arelent *cache_ptr;
     asymbol **symbols;
     bfd_size_type symcount;
{
  int r_index;
  int r_extern;
  int r_pcrel;
  struct aoutdata  *su = &(abfd->tdata.aout_data->a);

  cache_ptr->address = bfd_h_get_32 (abfd, bytes->r_address);

  /* now the fun stuff */

  cache_ptr->howto = MY_reloc_howto(abfd, bytes, r_index, r_extern, r_pcrel);

  MOVE_ADDRESS(0);
}

static void
MY_swap_std_reloc_out (abfd, g, natptr)
     bfd *abfd;
     arelent *g;
     struct reloc_std_external *natptr;
{
  int r_index;
  asymbol *sym = *(g->sym_ptr_ptr);
  int r_extern;
  unsigned int r_addend;
  asection *output_section = sym->section->output_section;

  r_addend = g->addend + (*(g->sym_ptr_ptr))->section->output_section->vma;
    
  /* name was clobbered by aout_write_syms to be symbol index */

  /* If this relocation is relative to a symbol then set the 
     r_index to the symbols index, and the r_extern bit.

     Absolute symbols can come in in two ways, either as an offset
     from the abs section, or as a symbol which has an abs value.
     Check for that here.  */

  if (bfd_is_com_section (output_section)
      || output_section == &bfd_abs_section
      || output_section == &bfd_und_section) 
    {
      if (bfd_abs_section.symbol == sym)
	{
	  /* Whoops, looked like an abs symbol, but is really an offset
	     from the abs section */
	  r_index = 0;
	  r_extern = 0;
	}
      else 
	{
	  /* Fill in symbol */
	  r_extern = 1;
#undef KEEPIT
#define KEEPIT udata.i
	  r_index =  (*(g->sym_ptr_ptr))->KEEPIT;
#undef KEEPIT     
	}
    }
  else 
    {
      /* Just an ordinary section */
      r_extern = 0;
      r_index  = output_section->target_index;      
    }

  MY_put_reloc (abfd, r_extern, r_index, g->address, g->howto, natptr);
}

bfd_reloc_status_type
_bfd_ns32k_relocate_contents (howto, input_bfd, relocation, location)
     reloc_howto_type *howto;
     bfd *input_bfd;
     bfd_vma relocation;
     bfd_byte *location;
{
  int r_ns32k_type = (howto - MY(howto_table)) / 6;
  long (*get_data) PARAMS ((bfd_byte *, long, long));
  int (*put_data) PARAMS ((long, bfd_byte *, long, long));

  switch (r_ns32k_type)
    {
    case 0:
      get_data = _bfd_ns32k_get_immediate;
      put_data = _bfd_ns32k_put_immediate;
      break;
    case 1:
      get_data = _bfd_ns32k_get_displacement;
      put_data = _bfd_ns32k_put_displacement;
      break;
    case 2:
      return _bfd_relocate_contents (howto, input_bfd, relocation,
				    location);
      /* NOT REACHED */
      break;
    default:
      return bfd_reloc_notsupported;
    }
  return _bfd_do_ns32k_reloc_contents (howto, input_bfd, relocation,
				       location, get_data, put_data);
}