1 /* BFD back-end for WDC 65816 COFF binaries.
2 Copyright (C) 1995-2016 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 #define NUM_HOWTOS (sizeof (howto_table) / sizeof (howto_table[0]))
46
47 /* Turn a howto into a reloc number. */
48
49 #define SELECT_RELOC(x,howto) \
50 { x.r_type = select_reloc(howto); }
51
52 #define BADMAG(x) (W65BADMAG(x))
53 #define W65 1 /* Customize coffcode.h */
54 #define __A_MAGIC_SET__
55
56 /* Code to swap in the reloc */
57 #define SWAP_IN_RELOC_OFFSET H_GET_32
58 #define SWAP_OUT_RELOC_OFFSET H_PUT_32
59 #define SWAP_OUT_RELOC_EXTRA(abfd, src, dst) \
60 dst->r_stuff[0] = 'S'; \
61 dst->r_stuff[1] = 'C';
62
63 static int
select_reloc(reloc_howto_type * howto)64 select_reloc (reloc_howto_type *howto)
65 {
66 return howto->type;
67 }
68
69 /* Code to turn a r_type into a howto ptr, uses the above howto table. */
70
71 static void
rtype2howto(arelent * internal,struct internal_reloc * dst)72 rtype2howto (arelent *internal,
73 struct internal_reloc *dst)
74 {
75 if (dst->r_type > 0 && dst->r_type <= NUM_HOWTOS)
76 internal->howto = howto_table + dst->r_type - 1;
77 else
78 internal->howto = NULL;
79 }
80
81 #define RTYPE2HOWTO(internal, relocentry) rtype2howto(internal,relocentry)
82
83 /* Perform any necessary magic to the addend in a reloc entry. */
84
85 #define CALC_ADDEND(abfd, symbol, ext_reloc, cache_ptr) \
86 cache_ptr->addend = ext_reloc.r_offset;
87
88 #define RELOC_PROCESSING(relent,reloc,symbols,abfd,section) \
89 reloc_processing(relent, reloc, symbols, abfd, section)
90
91 static void
reloc_processing(arelent * relent,struct internal_reloc * reloc,asymbol ** symbols,bfd * abfd,asection * section)92 reloc_processing (arelent * relent,
93 struct internal_reloc *reloc,
94 asymbol ** symbols,
95 bfd * abfd,
96 asection * section)
97 {
98 relent->address = reloc->r_vaddr;
99 rtype2howto (relent, reloc);
100
101 if (((int) reloc->r_symndx) > 0)
102 relent->sym_ptr_ptr = symbols + obj_convert (abfd)[reloc->r_symndx];
103 else
104 relent->sym_ptr_ptr = (asymbol **) bfd_abs_section_ptr->symbol_ptr_ptr;
105
106 relent->addend = reloc->r_offset;
107
108 relent->address -= section->vma;
109 /* relent->section = 0;*/
110 }
111
112 static int
w65_reloc16_estimate(bfd * abfd,asection * input_section,arelent * reloc,unsigned int shrink,struct bfd_link_info * link_info)113 w65_reloc16_estimate (bfd *abfd,
114 asection *input_section,
115 arelent *reloc,
116 unsigned int shrink,
117 struct bfd_link_info *link_info)
118 {
119 bfd_vma value;
120 bfd_vma dot;
121 bfd_vma gap;
122
123 /* The address of the thing to be relocated will have moved back by
124 the size of the shrink - but we don't change reloc->address here,
125 since we need it to know where the relocation lives in the source
126 uncooked section. */
127
128 /* reloc->address -= shrink; conceptual */
129
130 bfd_vma address = reloc->address - shrink;
131
132 switch (reloc->howto->type)
133 {
134 case R_MOV16B2:
135 case R_JMP2:
136 shrink+=2;
137 break;
138
139 /* Thing is a move one byte. */
140 case R_MOV16B1:
141 value = bfd_coff_reloc16_get_value (reloc, link_info, input_section);
142
143 if (value >= 0xff00)
144 {
145 /* Change the reloc type from 16bit, possible 8 to 8bit
146 possible 16. */
147 reloc->howto = reloc->howto + 1;
148 /* The place to relc moves back by one. */
149 /* This will be two bytes smaller in the long run. */
150 shrink += 2;
151 bfd_perform_slip (abfd, 2, input_section, address);
152 }
153
154 break;
155 /* This is the 24 bit branch which could become an 8 bitter,
156 the relocation points to the first byte of the insn, not the
157 actual data. */
158
159 case R_JMPL1:
160 value = bfd_coff_reloc16_get_value (reloc, link_info, input_section);
161
162 dot = input_section->output_section->vma +
163 input_section->output_offset + address;
164
165 /* See if the address we're looking at within 127 bytes of where
166 we are, if so then we can use a small branch rather than the
167 jump we were going to. */
168 gap = value - dot;
169
170 if (-120 < (long) gap && (long) gap < 120)
171 {
172 /* Change the reloc type from 24bit, possible 8 to 8bit
173 possible 32. */
174 reloc->howto = reloc->howto + 1;
175 /* This will be two bytes smaller in the long run. */
176 shrink += 2;
177 bfd_perform_slip (abfd, 2, input_section, address);
178 }
179 break;
180
181 case R_JMP1:
182 value = bfd_coff_reloc16_get_value (reloc, link_info, input_section);
183
184 dot = input_section->output_section->vma +
185 input_section->output_offset + address;
186
187 /* See if the address we're looking at within 127 bytes of where
188 we are, if so then we can use a small branch rather than the
189 jump we were going to. */
190 gap = value - (dot - shrink);
191
192 if (-120 < (long) gap && (long) gap < 120)
193 {
194 /* Change the reloc type from 16bit, possible 8 to 8bit
195 possible 16. */
196 reloc->howto = reloc->howto + 1;
197 /* The place to relc moves back by one. */
198
199 /* This will be two bytes smaller in the long run. */
200 shrink += 2;
201 bfd_perform_slip (abfd, 2, input_section, address);
202 }
203 break;
204 }
205
206 return shrink;
207 }
208
209 /* First phase of a relaxing link. */
210
211 /* Reloc types
212 large small
213 R_MOV16B1 R_MOV16B2 mov.b with 16bit or 8 bit address
214 R_JMP1 R_JMP2 jmp or pcrel branch
215 R_JMPL1 R_JMPL_B8 24jmp or pcrel branch
216 R_MOV24B1 R_MOV24B2 24 or 8 bit reloc for mov.b */
217
218 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)219 w65_reloc16_extra_cases (bfd *abfd,
220 struct bfd_link_info *link_info,
221 struct bfd_link_order *link_order,
222 arelent *reloc,
223 bfd_byte *data,
224 unsigned int *src_ptr,
225 unsigned int *dst_ptr)
226 {
227 unsigned int src_address = *src_ptr;
228 unsigned int dst_address = *dst_ptr;
229 asection *input_section = link_order->u.indirect.section;
230
231 switch (reloc->howto->type)
232 {
233 case R_W65_ABS8:
234 case R_W65_DP:
235 {
236 unsigned int gap = bfd_coff_reloc16_get_value (reloc, link_info,
237 input_section);
238 bfd_put_8 (abfd, gap, data + dst_address);
239 dst_address += 1;
240 src_address += 1;
241 }
242 break;
243
244 case R_W65_ABS8S8:
245 {
246 unsigned int gap = bfd_coff_reloc16_get_value (reloc, link_info,
247 input_section);
248 gap >>= 8;
249 bfd_put_8 (abfd, gap, data + dst_address);
250 dst_address += 1;
251 src_address += 1;
252 }
253 break;
254
255 case R_W65_ABS8S16:
256 {
257 unsigned int gap = bfd_coff_reloc16_get_value (reloc, link_info,
258 input_section);
259 gap >>= 16;
260 bfd_put_8 (abfd, gap, data + dst_address);
261 dst_address += 1;
262 src_address += 1;
263 }
264 break;
265
266 case R_W65_ABS16:
267 {
268 unsigned int gap = bfd_coff_reloc16_get_value (reloc, link_info,
269 input_section);
270
271 bfd_put_16 (abfd, (bfd_vma) gap, data + dst_address);
272 dst_address += 2;
273 src_address += 2;
274 }
275 break;
276 case R_W65_ABS16S8:
277 {
278 unsigned int gap = bfd_coff_reloc16_get_value (reloc, link_info,
279 input_section);
280 gap >>= 8;
281 bfd_put_16 (abfd, (bfd_vma) gap, data + dst_address);
282 dst_address += 2;
283 src_address += 2;
284 }
285 break;
286 case R_W65_ABS16S16:
287 {
288 unsigned int gap = bfd_coff_reloc16_get_value (reloc, link_info,
289 input_section);
290 gap >>= 16;
291 bfd_put_16 (abfd, (bfd_vma) gap, data + dst_address);
292 dst_address += 2;
293 src_address += 2;
294 }
295 break;
296
297 case R_W65_ABS24:
298 {
299 unsigned int gap = bfd_coff_reloc16_get_value (reloc, link_info,
300 input_section);
301 bfd_put_16 (abfd, (bfd_vma) gap, data + dst_address);
302 bfd_put_8 (abfd, gap >> 16, data+dst_address + 2);
303 dst_address += 3;
304 src_address += 3;
305 }
306 break;
307
308 case R_W65_PCR8:
309 {
310 int gap = bfd_coff_reloc16_get_value (reloc, link_info,
311 input_section);
312 bfd_vma dot = (dst_address
313 + input_section->output_offset
314 + input_section->output_section->vma);
315
316 gap -= dot + 1;
317 if (gap < -128 || gap > 127)
318 (*link_info->callbacks->reloc_overflow)
319 (link_info, NULL, bfd_asymbol_name (*reloc->sym_ptr_ptr),
320 reloc->howto->name, reloc->addend, input_section->owner,
321 input_section, reloc->address);
322
323 bfd_put_8 (abfd, gap, data + dst_address);
324 dst_address += 1;
325 src_address += 1;
326 }
327 break;
328
329 case R_W65_PCR16:
330 {
331 bfd_vma gap = bfd_coff_reloc16_get_value (reloc, link_info,
332 input_section);
333 bfd_vma dot = (dst_address
334 + input_section->output_offset
335 + input_section->output_section->vma);
336
337 /* This wraps within the page, so ignore the relativeness, look at the
338 high part. */
339 if ((gap & 0xf0000) != (dot & 0xf0000))
340 (*link_info->callbacks->reloc_overflow)
341 (link_info, NULL, bfd_asymbol_name (*reloc->sym_ptr_ptr),
342 reloc->howto->name, reloc->addend, input_section->owner,
343 input_section, reloc->address);
344
345 gap -= dot + 2;
346 bfd_put_16 (abfd, gap, data + dst_address);
347 dst_address += 2;
348 src_address += 2;
349 }
350 break;
351 default:
352 printf (_("ignoring reloc %s\n"), reloc->howto->name);
353 break;
354
355 }
356 *src_ptr = src_address;
357 *dst_ptr = dst_address;
358 }
359
360 #define coff_reloc16_extra_cases w65_reloc16_extra_cases
361 #define coff_reloc16_estimate w65_reloc16_estimate
362
363 #ifndef bfd_pe_print_pdata
364 #define bfd_pe_print_pdata NULL
365 #endif
366
367 #include "coffcode.h"
368
369 #undef coff_bfd_get_relocated_section_contents
370 #undef coff_bfd_relax_section
371 #define coff_bfd_get_relocated_section_contents \
372 bfd_coff_reloc16_get_relocated_section_contents
373 #define coff_bfd_relax_section bfd_coff_reloc16_relax_section
374
375 CREATE_LITTLE_COFF_TARGET_VEC (w65_coff_vec, "coff-w65", BFD_IS_RELAXABLE, 0, '_', NULL, COFF_SWAP_TABLE)
376