aboutsummaryrefslogtreecommitdiff
path: root/bfd/coff-w65.c
blob: c9c58f74cf511ae69531030a1644b83645be0a78 (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
/* BFD back-end for WDC 65816 COFF binaries.
   Copyright (C) 1995-2018 Free Software Foundation, Inc.
   Written by Steve Chamberlain, <sac@cygnus.com>.

   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 3 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., 51 Franklin Street - Fifth Floor, Boston,
   MA 02110-1301, USA.  */

#include "sysdep.h"
#include "bfd.h"
#include "libbfd.h"
#include "bfdlink.h"
#include "coff/w65.h"
#include "coff/internal.h"
#include "libcoff.h"

#define COFF_DEFAULT_SECTION_ALIGNMENT_POWER (1)
static reloc_howto_type howto_table[] =
{
  HOWTO (R_W65_ABS8,    0,  0, 8,  FALSE, 0, complain_overflow_bitfield, 0, "abs8", TRUE, 0x000000ff, 0x000000ff, FALSE),
  HOWTO (R_W65_ABS16,   1,  0, 16, FALSE, 0, complain_overflow_bitfield, 0, "abs16", TRUE, 0x0000ffff, 0x0000ffff, FALSE),
  HOWTO (R_W65_ABS24,   0,  2, 32, FALSE, 0, complain_overflow_bitfield, 0, "abs24", TRUE, 0x00ffffff, 0x00ffffff, FALSE),
  HOWTO (R_W65_ABS8S8,  0,  0, 8,  FALSE, 0, complain_overflow_bitfield, 0, ">abs8", TRUE, 0x000000ff, 0x000000ff, FALSE),
  HOWTO (R_W65_ABS8S16, 0,  0, 8,  FALSE, 0, complain_overflow_bitfield, 0, "^abs8", TRUE, 0x000000ff, 0x000000ff, FALSE),
  HOWTO (R_W65_ABS16S8, 1,  0, 16, FALSE, 0, complain_overflow_bitfield, 0, ">abs16", TRUE, 0x0000ffff, 0x0000ffff, FALSE),
  HOWTO (R_W65_ABS16S16,1,  0, 16, FALSE, 0, complain_overflow_bitfield, 0, "^abs16", TRUE, 0x0000ffff, 0x0000ffff, FALSE),
  HOWTO (R_W65_PCR8,    0,  0, 8,  FALSE, 0, complain_overflow_bitfield, 0, "pcrel8", TRUE, 0x000000ff, 0x000000ff, TRUE),
  HOWTO (R_W65_PCR16,   1,  0, 16, FALSE, 0, complain_overflow_bitfield, 0, "pcrel16", TRUE, 0x0000ffff, 0x0000ffff, TRUE),
  HOWTO (R_W65_DP,      0,  0, 8,  FALSE, 0, complain_overflow_bitfield, 0, "dp", TRUE, 0x000000ff, 0x000000ff, FALSE),
};

#define NUM_HOWTOS (sizeof (howto_table) / sizeof (howto_table[0]))

/* Turn a howto into a reloc number.  */

#define SELECT_RELOC(x,howto) \
  { x.r_type = select_reloc(howto); }

#define BADMAG(x) (W65BADMAG(x))
#define W65 1			/* Customize coffcode.h */
#define __A_MAGIC_SET__

/* Code to swap in the reloc */
#define SWAP_IN_RELOC_OFFSET	H_GET_32
#define SWAP_OUT_RELOC_OFFSET	H_PUT_32
#define SWAP_OUT_RELOC_EXTRA(abfd, src, dst) \
  dst->r_stuff[0] = 'S'; \
  dst->r_stuff[1] = 'C';

static int
select_reloc (reloc_howto_type *howto)
{
  return howto->type;
}

/* Code to turn a r_type into a howto ptr, uses the above howto table.  */

static void
rtype2howto (arelent *internal,
	     struct internal_reloc *dst)
{
  if (dst->r_type > 0 && dst->r_type <= NUM_HOWTOS)
    internal->howto = howto_table + dst->r_type - 1;
  else
    internal->howto = NULL;
}

#define RTYPE2HOWTO(internal, relocentry) rtype2howto(internal,relocentry)

/* Perform any necessary magic to the addend in a reloc entry.  */

#define CALC_ADDEND(abfd, symbol, ext_reloc, cache_ptr) \
 cache_ptr->addend =  ext_reloc.r_offset;

#define RELOC_PROCESSING(relent,reloc,symbols,abfd,section) \
 reloc_processing(relent, reloc, symbols, abfd, section)

static void
reloc_processing (arelent * relent,
		  struct internal_reloc *reloc,
		  asymbol ** symbols,
		  bfd * abfd,
		  asection * section)
{
  relent->address = reloc->r_vaddr;
  rtype2howto (relent, reloc);

  if (((int) reloc->r_symndx) > 0)
    relent->sym_ptr_ptr = symbols + obj_convert (abfd)[reloc->r_symndx];
  else
    relent->sym_ptr_ptr = (asymbol **) bfd_abs_section_ptr->symbol_ptr_ptr;

  relent->addend = reloc->r_offset;

  relent->address -= section->vma;
  /*  relent->section = 0;*/
}

static int
w65_reloc16_estimate (bfd *abfd,
		      asection *input_section,
		      arelent *reloc,
		      unsigned int shrink,
		      struct bfd_link_info *link_info)
{
  bfd_vma value;
  bfd_vma dot;
  bfd_vma gap;

  /* The address of the thing to be relocated will have moved back by
     the size of the shrink  - but we don't change reloc->address here,
     since we need it to know where the relocation lives in the source
     uncooked section.  */

  /*  reloc->address -= shrink;   conceptual */

  bfd_vma address = reloc->address - shrink;

  switch (reloc->howto->type)
    {
    case R_MOV16B2:
    case R_JMP2:
      shrink+=2;
      break;

      /* Thing is a move one byte.  */
    case R_MOV16B1:
      value = bfd_coff_reloc16_get_value (reloc, link_info, input_section);

      if (value >= 0xff00)
	{
	  /* Change the reloc type from 16bit, possible 8 to 8bit
	     possible 16.  */
	  reloc->howto = reloc->howto + 1;
	  /* The place to relc moves back by one.  */
	  /* This will be two bytes smaller in the long run.  */
	  shrink += 2;
	  bfd_perform_slip (abfd, 2, input_section, address);
	}

      break;
      /* This is the 24 bit branch which could become an 8 bitter,
	 the relocation points to the first byte of the insn, not the
	 actual data.  */

    case R_JMPL1:
      value = bfd_coff_reloc16_get_value (reloc, link_info, input_section);

      dot = input_section->output_section->vma +
	input_section->output_offset + address;

      /* See if the address we're looking at within 127 bytes of where
	 we are, if so then we can use a small branch rather than the
	 jump we were going to.  */
      gap = value - dot;

      if (-120 < (long) gap && (long) gap < 120)
	{
	  /* Change the reloc type from 24bit, possible 8 to 8bit
	     possible 32.  */
	  reloc->howto = reloc->howto + 1;
	  /* This will be two bytes smaller in the long run.  */
	  shrink += 2;
	  bfd_perform_slip (abfd, 2, input_section, address);
	}
      break;

    case R_JMP1:
      value = bfd_coff_reloc16_get_value (reloc, link_info, input_section);

      dot = input_section->output_section->vma +
	input_section->output_offset + address;

      /* See if the address we're looking at within 127 bytes of where
	 we are, if so then we can use a small branch rather than the
	 jump we were going to.  */
      gap = value - (dot - shrink);

      if (-120 < (long) gap && (long) gap < 120)
	{
	  /* Change the reloc type from 16bit, possible 8 to 8bit
	     possible 16.  */
	  reloc->howto = reloc->howto + 1;
	  /* The place to relc moves back by one.  */

	  /* This will be two bytes smaller in the long run.  */
	  shrink += 2;
	  bfd_perform_slip (abfd, 2, input_section, address);
	}
      break;
    }

  return shrink;
}

/* First phase of a relaxing link.  */

/* Reloc types
   large		small
   R_MOV16B1		R_MOV16B2	mov.b with 16bit or 8 bit address
   R_JMP1		R_JMP2		jmp or pcrel branch
   R_JMPL1		R_JMPL_B8	24jmp or pcrel branch
   R_MOV24B1		R_MOV24B2	24 or 8 bit reloc for mov.b  */

static void
w65_reloc16_extra_cases (bfd *abfd,
			 struct bfd_link_info *link_info,
			 struct bfd_link_order *link_order,
			 arelent *reloc,
			 bfd_byte *data,
			 unsigned int *src_ptr,
			 unsigned int *dst_ptr)
{
  unsigned int src_address = *src_ptr;
  unsigned int dst_address = *dst_ptr;
  asection *input_section = link_order->u.indirect.section;

  switch (reloc->howto->type)
    {
    case R_W65_ABS8:
    case R_W65_DP:
      {
	unsigned int gap = bfd_coff_reloc16_get_value (reloc, link_info,
						       input_section);
	bfd_put_8 (abfd, gap, data + dst_address);
	dst_address += 1;
	src_address += 1;
      }
      break;

    case R_W65_ABS8S8:
      {
	unsigned int gap = bfd_coff_reloc16_get_value (reloc, link_info,
						       input_section);
	gap >>= 8;
	bfd_put_8 (abfd, gap, data + dst_address);
	dst_address += 1;
	src_address += 1;
      }
      break;

    case R_W65_ABS8S16:
      {
	unsigned int gap = bfd_coff_reloc16_get_value (reloc, link_info,
						       input_section);
	gap >>= 16;
	bfd_put_8 (abfd, gap, data + dst_address);
	dst_address += 1;
	src_address += 1;
      }
      break;

    case R_W65_ABS16:
      {
	unsigned int gap = bfd_coff_reloc16_get_value (reloc, link_info,
						       input_section);

	bfd_put_16 (abfd, (bfd_vma) gap, data + dst_address);
	dst_address += 2;
	src_address += 2;
      }
      break;
    case R_W65_ABS16S8:
      {
	unsigned int gap = bfd_coff_reloc16_get_value (reloc, link_info,
						       input_section);
	gap >>= 8;
	bfd_put_16 (abfd, (bfd_vma) gap, data + dst_address);
	dst_address += 2;
	src_address += 2;
      }
      break;
    case R_W65_ABS16S16:
      {
	unsigned int gap = bfd_coff_reloc16_get_value (reloc, link_info,
						       input_section);
	gap >>= 16;
	bfd_put_16 (abfd, (bfd_vma) gap, data + dst_address);
	dst_address += 2;
	src_address += 2;
      }
      break;

    case R_W65_ABS24:
      {
	unsigned int gap = bfd_coff_reloc16_get_value (reloc, link_info,
						       input_section);
	bfd_put_16 (abfd, (bfd_vma) gap, data + dst_address);
	bfd_put_8 (abfd, gap >> 16, data+dst_address + 2);
	dst_address += 3;
	src_address += 3;
      }
      break;

    case R_W65_PCR8:
      {
	int gap = bfd_coff_reloc16_get_value (reloc, link_info,
					      input_section);
	bfd_vma dot = (dst_address
		       + input_section->output_offset
		       + input_section->output_section->vma);

	gap -= dot + 1;
	if (gap < -128 || gap > 127)
	  (*link_info->callbacks->reloc_overflow)
	    (link_info, NULL, bfd_asymbol_name (*reloc->sym_ptr_ptr),
	     reloc->howto->name, reloc->addend, input_section->owner,
	     input_section, reloc->address);

	bfd_put_8 (abfd, gap, data + dst_address);
	dst_address += 1;
	src_address += 1;
      }
      break;

    case R_W65_PCR16:
      {
	bfd_vma gap = bfd_coff_reloc16_get_value (reloc, link_info,
						  input_section);
	bfd_vma dot = (dst_address
		       + input_section->output_offset
		       + input_section->output_section->vma);

	/* This wraps within the page, so ignore the relativeness, look at the
	   high part.  */
	if ((gap & 0xf0000) != (dot & 0xf0000))
	  (*link_info->callbacks->reloc_overflow)
	    (link_info, NULL, bfd_asymbol_name (*reloc->sym_ptr_ptr),
	     reloc->howto->name, reloc->addend, input_section->owner,
	     input_section, reloc->address);

	gap -= dot + 2;
	bfd_put_16 (abfd, gap, data + dst_address);
	dst_address += 2;
	src_address += 2;
      }
      break;
    default:
      printf (_("ignoring reloc %s\n"), reloc->howto->name);
      break;

    }
  *src_ptr = src_address;
  *dst_ptr = dst_address;
}

#define coff_reloc16_extra_cases w65_reloc16_extra_cases
#define coff_reloc16_estimate w65_reloc16_estimate

#ifndef bfd_pe_print_pdata
#define bfd_pe_print_pdata	NULL
#endif

#include "coffcode.h"

#undef coff_bfd_get_relocated_section_contents
#undef coff_bfd_relax_section
#define coff_bfd_get_relocated_section_contents \
  bfd_coff_reloc16_get_relocated_section_contents
#define coff_bfd_relax_section bfd_coff_reloc16_relax_section

CREATE_LITTLE_COFF_TARGET_VEC (w65_coff_vec, "coff-w65", BFD_IS_RELAXABLE, 0, '_', NULL, COFF_SWAP_TABLE)