1 /* BFD back-end for WDC 65816 COFF binaries.
2 Copyright (C) 1995-2014 Free Software Foundation, Inc.
3 Written by Steve Chamberlain, <sac@cygnus.com>.
4
5 This file is part of BFD, the Binary File Descriptor library.
6
7 This program 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 of the License, or
10 (at your option) any later version.
11
12 This program 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 this program; if not, write to the Free Software
19 Foundation, Inc., 51 Franklin Street - Fifth Floor, Boston,
20 MA 02110-1301, USA. */
21
22 #include "sysdep.h"
23 #include "bfd.h"
24 #include "libbfd.h"
25 #include "bfdlink.h"
26 #include "coff/w65.h"
27 #include "coff/internal.h"
28 #include "libcoff.h"
29
30 #define COFF_DEFAULT_SECTION_ALIGNMENT_POWER (1)
31 static reloc_howto_type howto_table[] =
32 {
33 HOWTO (R_W65_ABS8, 0, 0, 8, FALSE, 0, complain_overflow_bitfield, 0, "abs8", TRUE, 0x000000ff, 0x000000ff, FALSE),
34 HOWTO (R_W65_ABS16, 1, 0, 16, FALSE, 0, complain_overflow_bitfield, 0, "abs16", TRUE, 0x0000ffff, 0x0000ffff, FALSE),
35 HOWTO (R_W65_ABS24, 0, 2, 32, FALSE, 0, complain_overflow_bitfield, 0, "abs24", TRUE, 0x00ffffff, 0x00ffffff, FALSE),
36 HOWTO (R_W65_ABS8S8, 0, 0, 8, FALSE, 0, complain_overflow_bitfield, 0, ">abs8", TRUE, 0x000000ff, 0x000000ff, FALSE),
37 HOWTO (R_W65_ABS8S16, 0, 0, 8, FALSE, 0, complain_overflow_bitfield, 0, "^abs8", TRUE, 0x000000ff, 0x000000ff, FALSE),
38 HOWTO (R_W65_ABS16S8, 1, 0, 16, FALSE, 0, complain_overflow_bitfield, 0, ">abs16", TRUE, 0x0000ffff, 0x0000ffff, FALSE),
39 HOWTO (R_W65_ABS16S16,1, 0, 16, FALSE, 0, complain_overflow_bitfield, 0, "^abs16", TRUE, 0x0000ffff, 0x0000ffff, FALSE),
40 HOWTO (R_W65_PCR8, 0, 0, 8, FALSE, 0, complain_overflow_bitfield, 0, "pcrel8", TRUE, 0x000000ff, 0x000000ff, TRUE),
41 HOWTO (R_W65_PCR16, 1, 0, 16, FALSE, 0, complain_overflow_bitfield, 0, "pcrel16", TRUE, 0x0000ffff, 0x0000ffff, TRUE),
42 HOWTO (R_W65_DP, 0, 0, 8, FALSE, 0, complain_overflow_bitfield, 0, "dp", TRUE, 0x000000ff, 0x000000ff, FALSE),
43 };
44
45 /* Turn a howto into a reloc number. */
46
47 #define SELECT_RELOC(x,howto) \
48 { x.r_type = select_reloc(howto); }
49
50 #define BADMAG(x) (W65BADMAG(x))
51 #define W65 1 /* Customize coffcode.h */
52 #define __A_MAGIC_SET__
53
54 /* Code to swap in the reloc */
55 #define SWAP_IN_RELOC_OFFSET H_GET_32
56 #define SWAP_OUT_RELOC_OFFSET H_PUT_32
57 #define SWAP_OUT_RELOC_EXTRA(abfd, src, dst) \
58 dst->r_stuff[0] = 'S'; \
59 dst->r_stuff[1] = 'C';
60
61 static int
select_reloc(reloc_howto_type * howto)62 select_reloc (reloc_howto_type *howto)
63 {
64 return howto->type ;
65 }
66
67 /* Code to turn a r_type into a howto ptr, uses the above howto table. */
68
69 static void
rtype2howto(arelent * internal,struct internal_reloc * dst)70 rtype2howto (arelent *internal,
71 struct internal_reloc *dst)
72 {
73 internal->howto = howto_table + dst->r_type - 1;
74 }
75
76 #define RTYPE2HOWTO(internal, relocentry) rtype2howto(internal,relocentry)
77
78 /* Perform any necessary magic to the addend in a reloc entry. */
79
80 #define CALC_ADDEND(abfd, symbol, ext_reloc, cache_ptr) \
81 cache_ptr->addend = ext_reloc.r_offset;
82
83 #define RELOC_PROCESSING(relent,reloc,symbols,abfd,section) \
84 reloc_processing(relent, reloc, symbols, abfd, section)
85
86 static void
reloc_processing(arelent * relent,struct internal_reloc * reloc,asymbol ** symbols,bfd * abfd,asection * section)87 reloc_processing (arelent * relent,
88 struct internal_reloc *reloc,
89 asymbol ** symbols,
90 bfd * abfd,
91 asection * section)
92 {
93 relent->address = reloc->r_vaddr;
94 rtype2howto (relent, reloc);
95
96 if (((int) reloc->r_symndx) > 0)
97 relent->sym_ptr_ptr = symbols + obj_convert (abfd)[reloc->r_symndx];
98 else
99 relent->sym_ptr_ptr = (asymbol **) bfd_abs_section_ptr->symbol_ptr_ptr;
100
101 relent->addend = reloc->r_offset;
102
103 relent->address -= section->vma;
104 /* relent->section = 0;*/
105 }
106
107 static int
w65_reloc16_estimate(bfd * abfd,asection * input_section,arelent * reloc,unsigned int shrink,struct bfd_link_info * link_info)108 w65_reloc16_estimate (bfd *abfd,
109 asection *input_section,
110 arelent *reloc,
111 unsigned int shrink,
112 struct bfd_link_info *link_info)
113 {
114 bfd_vma value;
115 bfd_vma dot;
116 bfd_vma gap;
117
118 /* The address of the thing to be relocated will have moved back by
119 the size of the shrink - but we don't change reloc->address here,
120 since we need it to know where the relocation lives in the source
121 uncooked section. */
122
123 /* reloc->address -= shrink; conceptual */
124
125 bfd_vma address = reloc->address - shrink;
126
127 switch (reloc->howto->type)
128 {
129 case R_MOV16B2:
130 case R_JMP2:
131 shrink+=2;
132 break;
133
134 /* Thing is a move one byte. */
135 case R_MOV16B1:
136 value = bfd_coff_reloc16_get_value (reloc, link_info, input_section);
137
138 if (value >= 0xff00)
139 {
140 /* Change the reloc type from 16bit, possible 8 to 8bit
141 possible 16. */
142 reloc->howto = reloc->howto + 1;
143 /* The place to relc moves back by one. */
144 /* This will be two bytes smaller in the long run. */
145 shrink += 2;
146 bfd_perform_slip (abfd, 2, input_section, address);
147 }
148
149 break;
150 /* This is the 24 bit branch which could become an 8 bitter,
151 the relocation points to the first byte of the insn, not the
152 actual data. */
153
154 case R_JMPL1:
155 value = bfd_coff_reloc16_get_value (reloc, link_info, input_section);
156
157 dot = input_section->output_section->vma +
158 input_section->output_offset + address;
159
160 /* See if the address we're looking at within 127 bytes of where
161 we are, if so then we can use a small branch rather than the
162 jump we were going to. */
163 gap = value - dot;
164
165 if (-120 < (long) gap && (long) gap < 120)
166 {
167 /* Change the reloc type from 24bit, possible 8 to 8bit
168 possible 32. */
169 reloc->howto = reloc->howto + 1;
170 /* This will be two bytes smaller in the long run. */
171 shrink += 2;
172 bfd_perform_slip (abfd, 2, input_section, address);
173 }
174 break;
175
176 case R_JMP1:
177 value = bfd_coff_reloc16_get_value (reloc, link_info, input_section);
178
179 dot = input_section->output_section->vma +
180 input_section->output_offset + address;
181
182 /* See if the address we're looking at within 127 bytes of where
183 we are, if so then we can use a small branch rather than the
184 jump we were going to. */
185 gap = value - (dot - shrink);
186
187 if (-120 < (long) gap && (long) gap < 120)
188 {
189 /* Change the reloc type from 16bit, possible 8 to 8bit
190 possible 16. */
191 reloc->howto = reloc->howto + 1;
192 /* The place to relc moves back by one. */
193
194 /* This will be two bytes smaller in the long run. */
195 shrink += 2;
196 bfd_perform_slip (abfd, 2, input_section, address);
197 }
198 break;
199 }
200
201 return shrink;
202 }
203
204 /* First phase of a relaxing link. */
205
206 /* Reloc types
207 large small
208 R_MOV16B1 R_MOV16B2 mov.b with 16bit or 8 bit address
209 R_JMP1 R_JMP2 jmp or pcrel branch
210 R_JMPL1 R_JMPL_B8 24jmp or pcrel branch
211 R_MOV24B1 R_MOV24B2 24 or 8 bit reloc for mov.b */
212
213 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)214 w65_reloc16_extra_cases (bfd *abfd,
215 struct bfd_link_info *link_info,
216 struct bfd_link_order *link_order,
217 arelent *reloc,
218 bfd_byte *data,
219 unsigned int *src_ptr,
220 unsigned int *dst_ptr)
221 {
222 unsigned int src_address = *src_ptr;
223 unsigned int dst_address = *dst_ptr;
224 asection *input_section = link_order->u.indirect.section;
225
226 switch (reloc->howto->type)
227 {
228 case R_W65_ABS8:
229 case R_W65_DP:
230 {
231 unsigned int gap = bfd_coff_reloc16_get_value (reloc, link_info,
232 input_section);
233 bfd_put_8 (abfd, gap, data + dst_address);
234 dst_address += 1;
235 src_address += 1;
236 }
237 break;
238
239 case R_W65_ABS8S8:
240 {
241 unsigned int gap = bfd_coff_reloc16_get_value (reloc, link_info,
242 input_section);
243 gap >>= 8;
244 bfd_put_8 (abfd, gap, data + dst_address);
245 dst_address += 1;
246 src_address += 1;
247 }
248 break;
249
250 case R_W65_ABS8S16:
251 {
252 unsigned int gap = bfd_coff_reloc16_get_value (reloc, link_info,
253 input_section);
254 gap >>= 16;
255 bfd_put_8 (abfd, gap, data + dst_address);
256 dst_address += 1;
257 src_address += 1;
258 }
259 break;
260
261 case R_W65_ABS16:
262 {
263 unsigned int gap = bfd_coff_reloc16_get_value (reloc, link_info,
264 input_section);
265
266 bfd_put_16 (abfd, (bfd_vma) gap, data + dst_address);
267 dst_address += 2;
268 src_address += 2;
269 }
270 break;
271 case R_W65_ABS16S8:
272 {
273 unsigned int gap = bfd_coff_reloc16_get_value (reloc, link_info,
274 input_section);
275 gap >>= 8;
276 bfd_put_16 (abfd, (bfd_vma) gap, data + dst_address);
277 dst_address += 2;
278 src_address += 2;
279 }
280 break;
281 case R_W65_ABS16S16:
282 {
283 unsigned int gap = bfd_coff_reloc16_get_value (reloc, link_info,
284 input_section);
285 gap >>= 16;
286 bfd_put_16 (abfd, (bfd_vma) gap, data + dst_address);
287 dst_address += 2;
288 src_address += 2;
289 }
290 break;
291
292 case R_W65_ABS24:
293 {
294 unsigned int gap = bfd_coff_reloc16_get_value (reloc, link_info,
295 input_section);
296 bfd_put_16 (abfd, (bfd_vma) gap, data + dst_address);
297 bfd_put_8 (abfd, gap >> 16, data+dst_address + 2);
298 dst_address += 3;
299 src_address += 3;
300 }
301 break;
302
303 case R_W65_PCR8:
304 {
305 int gap = bfd_coff_reloc16_get_value (reloc, link_info,
306 input_section);
307 bfd_vma dot = (dst_address
308 + input_section->output_offset
309 + input_section->output_section->vma);
310
311 gap -= dot + 1;
312 if (gap < -128 || gap > 127)
313 {
314 if (! ((*link_info->callbacks->reloc_overflow)
315 (link_info, NULL,
316 bfd_asymbol_name (*reloc->sym_ptr_ptr),
317 reloc->howto->name, reloc->addend, input_section->owner,
318 input_section, reloc->address)))
319 abort ();
320 }
321 bfd_put_8 (abfd, gap, data + dst_address);
322 dst_address += 1;
323 src_address += 1;
324 }
325 break;
326
327 case R_W65_PCR16:
328 {
329 bfd_vma gap = bfd_coff_reloc16_get_value (reloc, link_info,
330 input_section);
331 bfd_vma dot = (dst_address
332 + input_section->output_offset
333 + input_section->output_section->vma);
334
335 /* This wraps within the page, so ignore the relativeness, look at the
336 high part. */
337 if ((gap & 0xf0000) != (dot & 0xf0000))
338 {
339 if (! ((*link_info->callbacks->reloc_overflow)
340 (link_info, NULL,
341 bfd_asymbol_name (*reloc->sym_ptr_ptr),
342 reloc->howto->name, reloc->addend, input_section->owner,
343 input_section, reloc->address)))
344 abort ();
345 }
346
347 gap -= dot + 2;
348 bfd_put_16 (abfd, gap, data + dst_address);
349 dst_address += 2;
350 src_address += 2;
351 }
352 break;
353 default:
354 printf (_("ignoring reloc %s\n"), reloc->howto->name);
355 break;
356
357 }
358 *src_ptr = src_address;
359 *dst_ptr = dst_address;
360 }
361
362 #define coff_reloc16_extra_cases w65_reloc16_extra_cases
363 #define coff_reloc16_estimate w65_reloc16_estimate
364
365 #ifndef bfd_pe_print_pdata
366 #define bfd_pe_print_pdata NULL
367 #endif
368
369 #include "coffcode.h"
370
371 #undef coff_bfd_get_relocated_section_contents
372 #undef coff_bfd_relax_section
373 #define coff_bfd_get_relocated_section_contents \
374 bfd_coff_reloc16_get_relocated_section_contents
375 #define coff_bfd_relax_section bfd_coff_reloc16_relax_section
376
377 CREATE_LITTLE_COFF_TARGET_VEC (w65_coff_vec, "coff-w65", BFD_IS_RELAXABLE, 0, '_', NULL, COFF_SWAP_TABLE)
378