1/* BFD back-end for WDC 65816 COFF binaries.
2   Copyright 1995, 1996, 1997, 1999, 2000, 2001, 2002, 2003
3   Free Software Foundation, Inc.
4   Written by Steve Chamberlain, <sac@cygnus.com>.
5
6This file is part of BFD, the Binary File Descriptor library.
7
8This program is free software; you can redistribute it and/or modify
9it under the terms of the GNU General Public License as published by
10the Free Software Foundation; either version 2 of the License, or
11(at your option) any later version.
12
13This program is distributed in the hope that it will be useful,
14but WITHOUT ANY WARRANTY; without even the implied warranty of
15MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
16GNU General Public License for more details.
17
18You should have received a copy of the GNU General Public License
19along with this program; if not, write to the Free Software
20Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA.  */
21
22#include "bfd.h"
23#include "sysdep.h"
24#include "libbfd.h"
25#include "bfdlink.h"
26#include "coff/w65.h"
27#include "coff/internal.h"
28#include "libcoff.h"
29
30static int  select_reloc              PARAMS ((reloc_howto_type *));
31static void rtype2howto               PARAMS ((arelent *, struct internal_reloc *));
32static void reloc_processing          PARAMS ((arelent *, struct internal_reloc *, asymbol **, bfd *, asection *));
33static int  w65_reloc16_estimate    PARAMS ((bfd *, asection *, arelent *, unsigned int, struct bfd_link_info *));
34static void w65_reloc16_extra_cases PARAMS ((bfd *,struct bfd_link_info *, struct bfd_link_order *, arelent *, bfd_byte *, unsigned int *, unsigned int *));
35
36#define COFF_DEFAULT_SECTION_ALIGNMENT_POWER (1)
37static reloc_howto_type howto_table[] =
38  {
39    HOWTO (R_W65_ABS8,    0,  0, 8,  FALSE, 0, complain_overflow_bitfield, 0, "abs8", TRUE, 0x000000ff, 0x000000ff, FALSE),
40    HOWTO (R_W65_ABS16,   1,  0, 16, FALSE, 0, complain_overflow_bitfield, 0, "abs16", TRUE, 0x0000ffff, 0x0000ffff, FALSE),
41    HOWTO (R_W65_ABS24,   0,  2, 32, FALSE, 0, complain_overflow_bitfield, 0, "abs24", TRUE, 0x00ffffff, 0x00ffffff, FALSE),
42    HOWTO (R_W65_ABS8S8,  0,  0, 8,  FALSE, 0, complain_overflow_bitfield, 0, ">abs8", TRUE, 0x000000ff, 0x000000ff, FALSE),
43    HOWTO (R_W65_ABS8S16, 0,  0, 8,  FALSE, 0, complain_overflow_bitfield, 0, "^abs8", TRUE, 0x000000ff, 0x000000ff, FALSE),
44    HOWTO (R_W65_ABS16S8, 1,  0, 16, FALSE, 0, complain_overflow_bitfield, 0, ">abs16", TRUE, 0x0000ffff, 0x0000ffff, FALSE),
45    HOWTO (R_W65_ABS16S16,1,  0, 16, FALSE, 0, complain_overflow_bitfield, 0, "^abs16", TRUE, 0x0000ffff, 0x0000ffff, FALSE),
46    HOWTO (R_W65_PCR8,    0,  0, 8,  FALSE, 0, complain_overflow_bitfield, 0, "pcrel8", TRUE, 0x000000ff, 0x000000ff, TRUE),
47    HOWTO (R_W65_PCR16,   1,  0, 16, FALSE, 0, complain_overflow_bitfield, 0, "pcrel16", TRUE, 0x0000ffff, 0x0000ffff, TRUE),
48    HOWTO (R_W65_DP,      0,  0, 8,  FALSE, 0, complain_overflow_bitfield, 0, "dp", TRUE, 0x000000ff, 0x000000ff, FALSE),
49  };
50
51/* Turn a howto into a reloc number.  */
52
53#define SELECT_RELOC(x,howto) \
54  { x.r_type = select_reloc(howto); }
55
56#define BADMAG(x) (W65BADMAG(x))
57#define W65 1			/* Customize coffcode.h */
58#define __A_MAGIC_SET__
59
60/* Code to swap in the reloc */
61#define SWAP_IN_RELOC_OFFSET	H_GET_32
62#define SWAP_OUT_RELOC_OFFSET	H_PUT_32
63#define SWAP_OUT_RELOC_EXTRA(abfd, src, dst) \
64  dst->r_stuff[0] = 'S'; \
65  dst->r_stuff[1] = 'C';
66
67static int
68select_reloc (howto)
69     reloc_howto_type *howto;
70{
71  return howto->type ;
72}
73
74/* Code to turn a r_type into a howto ptr, uses the above howto table.  */
75
76static void
77rtype2howto (internal, dst)
78     arelent *internal;
79     struct internal_reloc *dst;
80{
81  internal->howto = howto_table + dst->r_type - 1;
82}
83
84#define RTYPE2HOWTO(internal, relocentry) rtype2howto(internal,relocentry)
85
86/* Perform any necessary magic to the addend in a reloc entry.  */
87
88#define CALC_ADDEND(abfd, symbol, ext_reloc, cache_ptr) \
89 cache_ptr->addend =  ext_reloc.r_offset;
90
91#define RELOC_PROCESSING(relent,reloc,symbols,abfd,section) \
92 reloc_processing(relent, reloc, symbols, abfd, section)
93
94static void
95reloc_processing (relent, reloc, symbols, abfd, section)
96     arelent * relent;
97     struct internal_reloc *reloc;
98     asymbol ** symbols;
99     bfd * abfd;
100     asection * section;
101{
102  relent->address = reloc->r_vaddr;
103  rtype2howto (relent, reloc);
104
105  if (((int) reloc->r_symndx) > 0)
106    relent->sym_ptr_ptr = symbols + obj_convert (abfd)[reloc->r_symndx];
107  else
108    relent->sym_ptr_ptr = (asymbol **)&(bfd_abs_symbol);
109
110  relent->addend = reloc->r_offset;
111
112  relent->address -= section->vma;
113  /*  relent->section = 0;*/
114}
115
116static int
117w65_reloc16_estimate (abfd, input_section, reloc, shrink, link_info)
118     bfd *abfd;
119     asection *input_section;
120     arelent *reloc;
121     unsigned int shrink;
122     struct bfd_link_info *link_info;
123{
124  bfd_vma value;
125  bfd_vma dot;
126  bfd_vma gap;
127
128  /* The address of the thing to be relocated will have moved back by
129   the size of the shrink  - but we don't change reloc->address here,
130   since we need it to know where the relocation lives in the source
131   uncooked section.  */
132
133  /*  reloc->address -= shrink;   conceptual */
134
135  bfd_vma address = reloc->address - shrink;
136
137  switch (reloc->howto->type)
138    {
139    case R_MOV16B2:
140    case R_JMP2:
141      shrink+=2;
142      break;
143
144      /* Thing is a move one byte.  */
145    case R_MOV16B1:
146      value = bfd_coff_reloc16_get_value (reloc, link_info, input_section);
147
148      if (value >= 0xff00)
149	{
150	  /* Change the reloc type from 16bit, possible 8 to 8bit
151	     possible 16.  */
152	  reloc->howto = reloc->howto + 1;
153	  /* The place to relc moves back by one.  */
154	  /* This will be two bytes smaller in the long run.  */
155	  shrink += 2;
156	  bfd_perform_slip (abfd, 2, input_section, address);
157	}
158
159      break;
160      /* This is the 24 bit branch which could become an 8 bitter,
161	 the relocation points to the first byte of the insn, not the
162	 actual data.  */
163
164    case R_JMPL1:
165      value = bfd_coff_reloc16_get_value (reloc, link_info, input_section);
166
167      dot = input_section->output_section->vma +
168	input_section->output_offset + address;
169
170      /* See if the address we're looking at within 127 bytes of where
171	 we are, if so then we can use a small branch rather than the
172	 jump we were going to.  */
173      gap = value - dot;
174
175      if (-120 < (long) gap && (long) gap < 120)
176	{
177	  /* Change the reloc type from 24bit, possible 8 to 8bit
178	     possible 32.  */
179	  reloc->howto = reloc->howto + 1;
180	  /* This will be two bytes smaller in the long run.  */
181	  shrink += 2;
182	  bfd_perform_slip (abfd, 2, input_section, address);
183	}
184      break;
185
186    case R_JMP1:
187      value = bfd_coff_reloc16_get_value (reloc, link_info, input_section);
188
189      dot = input_section->output_section->vma +
190	input_section->output_offset + address;
191
192      /* See if the address we're looking at within 127 bytes of where
193	 we are, if so then we can use a small branch rather than the
194	 jump we were going to.  */
195      gap = value - (dot - shrink);
196
197      if (-120 < (long) gap && (long) gap < 120)
198	{
199	  /* Change the reloc type from 16bit, possible 8 to 8bit
200	     possible 16.  */
201	  reloc->howto = reloc->howto + 1;
202	  /* The place to relc moves back by one.  */
203
204	  /* This will be two bytes smaller in the long run.  */
205	  shrink += 2;
206	  bfd_perform_slip (abfd, 2, input_section, address);
207	}
208      break;
209    }
210
211  return shrink;
212}
213
214/* First phase of a relaxing link.  */
215
216/* Reloc types
217   large		small
218   R_MOV16B1		R_MOV16B2	mov.b with 16bit or 8 bit address
219   R_JMP1		R_JMP2		jmp or pcrel branch
220   R_JMPL1		R_JMPL_B8	24jmp or pcrel branch
221   R_MOV24B1		R_MOV24B2	24 or 8 bit reloc for mov.b  */
222
223static void
224w65_reloc16_extra_cases (abfd, link_info, link_order, reloc, data, src_ptr,
225			   dst_ptr)
226     bfd *abfd;
227     struct bfd_link_info *link_info;
228     struct bfd_link_order *link_order;
229     arelent *reloc;
230     bfd_byte *data;
231     unsigned int *src_ptr;
232     unsigned int *dst_ptr;
233{
234  unsigned int src_address = *src_ptr;
235  unsigned int dst_address = *dst_ptr;
236  asection *input_section = link_order->u.indirect.section;
237
238  switch (reloc->howto->type)
239    {
240    case R_W65_ABS8:
241    case R_W65_DP:
242      {
243	unsigned int gap = bfd_coff_reloc16_get_value (reloc, link_info,
244						       input_section);
245	bfd_put_8 (abfd, gap, data + dst_address);
246	dst_address += 1;
247	src_address += 1;
248      }
249      break;
250
251    case R_W65_ABS8S8:
252      {
253	unsigned int gap = bfd_coff_reloc16_get_value (reloc, link_info,
254						       input_section);
255	gap >>= 8;
256	bfd_put_8 (abfd, gap, data + dst_address);
257	dst_address += 1;
258	src_address += 1;
259      }
260      break;
261
262    case R_W65_ABS8S16:
263      {
264	unsigned int gap = bfd_coff_reloc16_get_value (reloc, link_info,
265						       input_section);
266	gap >>= 16;
267	bfd_put_8 (abfd, gap, data + dst_address);
268	dst_address += 1;
269	src_address += 1;
270      }
271      break;
272
273    case R_W65_ABS16:
274      {
275	unsigned int gap = bfd_coff_reloc16_get_value (reloc, link_info,
276						       input_section);
277
278	bfd_put_16 (abfd, (bfd_vma) gap, data + dst_address);
279	dst_address += 2;
280	src_address += 2;
281      }
282      break;
283    case R_W65_ABS16S8:
284      {
285	unsigned int gap = bfd_coff_reloc16_get_value (reloc, link_info,
286						       input_section);
287	gap >>= 8;
288	bfd_put_16 (abfd, (bfd_vma) gap, data + dst_address);
289	dst_address += 2;
290	src_address += 2;
291      }
292      break;
293    case R_W65_ABS16S16:
294      {
295	unsigned int gap = bfd_coff_reloc16_get_value (reloc, link_info,
296						       input_section);
297	gap >>= 16;
298	bfd_put_16 (abfd, (bfd_vma) gap, data + dst_address);
299	dst_address += 2;
300	src_address += 2;
301      }
302      break;
303
304    case R_W65_ABS24:
305      {
306	unsigned int gap = bfd_coff_reloc16_get_value (reloc, link_info,
307						       input_section);
308	bfd_put_16 (abfd, (bfd_vma) gap, data + dst_address);
309	bfd_put_8 (abfd, gap >> 16, data+dst_address + 2);
310	dst_address += 3;
311	src_address += 3;
312      }
313      break;
314
315    case R_W65_PCR8:
316      {
317	int gap = bfd_coff_reloc16_get_value (reloc, link_info,
318					      input_section);
319	bfd_vma dot = link_order->offset
320	  + dst_address
321	    + link_order->u.indirect.section->output_section->vma;
322
323	gap -= dot + 1;
324	if (gap < -128 || gap > 127)
325	  {
326	    if (! ((*link_info->callbacks->reloc_overflow)
327		   (link_info, bfd_asymbol_name (*reloc->sym_ptr_ptr),
328		    reloc->howto->name, reloc->addend, input_section->owner,
329		    input_section, reloc->address)))
330	      abort ();
331	  }
332	bfd_put_8 (abfd, gap, data + dst_address);
333	dst_address += 1;
334	src_address += 1;
335      }
336      break;
337
338    case R_W65_PCR16:
339      {
340	bfd_vma gap = bfd_coff_reloc16_get_value (reloc, link_info,
341						  input_section);
342	bfd_vma dot = link_order->offset
343	  + dst_address
344	    + link_order->u.indirect.section->output_section->vma;
345
346	/* This wraps within the page, so ignore the relativeness, look at the
347	   high part.  */
348	if ((gap & 0xf0000) != (dot & 0xf0000))
349	  {
350	    if (! ((*link_info->callbacks->reloc_overflow)
351		   (link_info, bfd_asymbol_name (*reloc->sym_ptr_ptr),
352		    reloc->howto->name, reloc->addend, input_section->owner,
353		    input_section, reloc->address)))
354	      abort ();
355	  }
356
357	gap -= dot + 2;
358	bfd_put_16 (abfd, gap, data + dst_address);
359	dst_address += 2;
360	src_address += 2;
361      }
362      break;
363    default:
364      printf (_("ignoring reloc %s\n"), reloc->howto->name);
365      break;
366
367    }
368  *src_ptr = src_address;
369  *dst_ptr = dst_address;
370}
371
372#define coff_reloc16_extra_cases w65_reloc16_extra_cases
373#define coff_reloc16_estimate w65_reloc16_estimate
374
375#include "coffcode.h"
376
377#undef coff_bfd_get_relocated_section_contents
378#undef coff_bfd_relax_section
379#define coff_bfd_get_relocated_section_contents \
380  bfd_coff_reloc16_get_relocated_section_contents
381#define coff_bfd_relax_section bfd_coff_reloc16_relax_section
382
383CREATE_LITTLE_COFF_TARGET_VEC (w65_vec, "coff-w65", BFD_IS_RELAXABLE, 0, '_', NULL, COFF_SWAP_TABLE)
384