1 /* BFD back-end for Zilog Z800n COFF binaries.
2 Copyright (C) 1992-2023 Free Software Foundation, Inc.
3 Contributed by Cygnus Support.
4 Written by Steve Chamberlain, <sac@cygnus.com>.
5
6 This file is part of BFD, the Binary File Descriptor library.
7
8 This program is free software; you can redistribute it and/or modify
9 it under the terms of the GNU General Public License as published by
10 the Free Software Foundation; either version 3 of the License, or
11 (at your option) any later version.
12
13 This program is distributed in the hope that it will be useful,
14 but WITHOUT ANY WARRANTY; without even the implied warranty of
15 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
16 GNU General Public License for more details.
17
18 You should have received a copy of the GNU General Public License
19 along with this program; if not, write to the Free Software
20 Foundation, Inc., 51 Franklin Street - Fifth Floor, Boston,
21 MA 02110-1301, USA. */
22
23 #include "sysdep.h"
24 #include "bfd.h"
25 #include "libbfd.h"
26 #include "bfdlink.h"
27 #include "coff/z8k.h"
28 #include "coff/internal.h"
29 #include "libcoff.h"
30
31 #define COFF_DEFAULT_SECTION_ALIGNMENT_POWER (1)
32
33 static reloc_howto_type r_imm32 =
34 HOWTO (R_IMM32, 0, 4, 32, false, 0,
35 complain_overflow_bitfield, 0, "r_imm32", true, 0xffffffff,
36 0xffffffff, false);
37
38 static reloc_howto_type r_imm4l =
39 HOWTO (R_IMM4L, 0, 1, 4, false, 0,
40 complain_overflow_bitfield, 0, "r_imm4l", true, 0xf, 0xf, false);
41
42 static reloc_howto_type r_da =
43 HOWTO (R_IMM16, 0, 2, 16, false, 0,
44 complain_overflow_bitfield, 0, "r_da", true, 0x0000ffff, 0x0000ffff,
45 false);
46
47 static reloc_howto_type r_imm8 =
48 HOWTO (R_IMM8, 0, 1, 8, false, 0,
49 complain_overflow_bitfield, 0, "r_imm8", true, 0x000000ff, 0x000000ff,
50 false);
51
52 static reloc_howto_type r_rel16 =
53 HOWTO (R_REL16, 0, 2, 16, false, 0,
54 complain_overflow_bitfield, 0, "r_rel16", true, 0x0000ffff, 0x0000ffff,
55 true);
56
57 static reloc_howto_type r_jr =
58 HOWTO (R_JR, 1, 1, 8, true, 0, complain_overflow_signed, 0,
59 "r_jr", true, 0xff, 0xff, true);
60
61 static reloc_howto_type r_disp7 =
62 HOWTO (R_DISP7, 0, 1, 7, true, 0, complain_overflow_bitfield, 0,
63 "r_disp7", true, 0x7f, 0x7f, true);
64
65 static reloc_howto_type r_callr =
66 HOWTO (R_CALLR, 1, 2, 12, true, 0, complain_overflow_signed, 0,
67 "r_callr", true, 0xfff, 0xfff, true);
68
69 #define BADMAG(x) Z8KBADMAG(x)
70 #define Z8K 1 /* Customize coffcode.h. */
71 #define __A_MAGIC_SET__
72
73 /* Code to swap in the reloc. */
74 #define SWAP_IN_RELOC_OFFSET H_GET_32
75 #define SWAP_OUT_RELOC_OFFSET H_PUT_32
76 #define SWAP_OUT_RELOC_EXTRA(abfd, src, dst) \
77 dst->r_stuff[0] = 'S'; \
78 dst->r_stuff[1] = 'C';
79
80 /* Code to turn a r_type into a howto ptr, uses the above howto table. */
81
82 static void
83 rtype2howto (arelent *internal, struct internal_reloc *dst)
84 {
85 switch (dst->r_type)
86 {
87 default:
88 internal->howto = NULL;
89 break;
90 case R_IMM8:
91 internal->howto = &r_imm8;
92 break;
93 case R_IMM16:
94 internal->howto = &r_da;
95 break;
96 case R_JR:
97 internal->howto = &r_jr;
98 break;
99 case R_DISP7:
100 internal->howto = &r_disp7;
101 break;
102 case R_CALLR:
103 internal->howto = &r_callr;
104 break;
105 case R_REL16:
106 internal->howto = &r_rel16;
107 break;
108 case R_IMM32:
109 internal->howto = &r_imm32;
110 break;
111 case R_IMM4L:
112 internal->howto = &r_imm4l;
113 break;
114 }
115 }
116
117 #define RTYPE2HOWTO(internal, relocentry) rtype2howto (internal, relocentry)
118
119 static reloc_howto_type *
120 coff_z8k_reloc_type_lookup (bfd *abfd ATTRIBUTE_UNUSED,
121 bfd_reloc_code_real_type code)
122 {
123 switch (code)
124 {
125 case BFD_RELOC_8: return & r_imm8;
126 case BFD_RELOC_16: return & r_da;
127 case BFD_RELOC_32: return & r_imm32;
128 case BFD_RELOC_8_PCREL: return & r_jr;
129 case BFD_RELOC_16_PCREL: return & r_rel16;
130 case BFD_RELOC_Z8K_DISP7: return & r_disp7;
131 case BFD_RELOC_Z8K_CALLR: return & r_callr;
132 case BFD_RELOC_Z8K_IMM4L: return & r_imm4l;
133 default: BFD_FAIL ();
134 return 0;
135 }
136 }
137
138 static reloc_howto_type *
139 coff_z8k_reloc_name_lookup (bfd *abfd ATTRIBUTE_UNUSED,
140 const char *r_name)
141 {
142 if (strcasecmp (r_imm8.name, r_name) == 0)
143 return &r_imm8;
144 if (strcasecmp (r_da.name, r_name) == 0)
145 return &r_da;
146 if (strcasecmp (r_imm32.name, r_name) == 0)
147 return &r_imm32;
148 if (strcasecmp (r_jr.name, r_name) == 0)
149 return &r_jr;
150 if (strcasecmp (r_rel16.name, r_name) == 0)
151 return &r_rel16;
152 if (strcasecmp (r_disp7.name, r_name) == 0)
153 return &r_disp7;
154 if (strcasecmp (r_callr.name, r_name) == 0)
155 return &r_callr;
156 if (strcasecmp (r_imm4l.name, r_name) == 0)
157 return &r_imm4l;
158
159 return NULL;
160 }
161
162 /* Perform any necessary magic to the addend in a reloc entry. */
163
164 #define CALC_ADDEND(abfd, symbol, ext_reloc, cache_ptr) \
165 cache_ptr->addend = ext_reloc.r_offset;
166
167 #define RELOC_PROCESSING(relent,reloc,symbols,abfd,section) \
168 reloc_processing(relent, reloc, symbols, abfd, section)
169
170 static void
171 reloc_processing (arelent *relent,
172 struct internal_reloc *reloc,
173 asymbol **symbols,
174 bfd *abfd,
175 asection *section)
176 {
177 relent->address = reloc->r_vaddr;
178 rtype2howto (relent, reloc);
179
180 if (reloc->r_symndx == -1 || symbols == NULL)
181 relent->sym_ptr_ptr = bfd_abs_section_ptr->symbol_ptr_ptr;
182 else if (reloc->r_symndx >= 0 && reloc->r_symndx < obj_conv_table_size (abfd))
183 relent->sym_ptr_ptr = symbols + obj_convert (abfd)[reloc->r_symndx];
184 else
185 {
186 _bfd_error_handler
187 /* xgettext:c-format */
188 (_("%pB: warning: illegal symbol index %ld in relocs"),
189 abfd, reloc->r_symndx);
190 relent->sym_ptr_ptr = bfd_abs_section_ptr->symbol_ptr_ptr;
191 }
192 relent->addend = reloc->r_offset;
193 relent->address -= section->vma;
194 }
195
196 static bool
197 extra_case (bfd *in_abfd,
198 struct bfd_link_info *link_info,
199 struct bfd_link_order *link_order,
200 arelent *reloc,
201 bfd_byte *data,
202 size_t *src_ptr,
203 size_t *dst_ptr)
204 {
205 asection * input_section = link_order->u.indirect.section;
206 bfd_size_type end = bfd_get_section_limit_octets (in_abfd, input_section);
207 bfd_size_type reloc_size = bfd_get_reloc_size (reloc->howto);
208
209 if (*src_ptr > end
210 || reloc_size > end - *src_ptr)
211 {
212 link_info->callbacks->einfo
213 /* xgettext:c-format */
214 (_("%X%P: %pB(%pA): relocation \"%pR\" goes out of range\n"),
215 in_abfd, input_section, reloc);
216 return false;
217 }
218
219 switch (reloc->howto->type)
220 {
221 case R_IMM8:
222 bfd_put_8 (in_abfd,
223 bfd_coff_reloc16_get_value (reloc, link_info, input_section),
224 data + *dst_ptr);
225 *dst_ptr += 1;
226 *src_ptr += 1;
227 break;
228
229 case R_IMM32:
230 /* If no flags are set, assume immediate value. */
231 if (! (*reloc->sym_ptr_ptr)->section->flags)
232 {
233 bfd_put_32 (in_abfd,
234 bfd_coff_reloc16_get_value (reloc, link_info,
235 input_section),
236 data + *dst_ptr);
237 }
238 else
239 {
240 bfd_vma dst = bfd_coff_reloc16_get_value (reloc, link_info,
241 input_section);
242 /* Addresses are 23 bit, and the layout of those in a 32-bit
243 value is as follows:
244 1AAAAAAA xxxxxxxx AAAAAAAA AAAAAAAA
245 (A - address bits, x - ignore). */
246 dst = (dst & 0xffff) | ((dst & 0xff0000) << 8) | 0x80000000;
247 bfd_put_32 (in_abfd, dst, data + *dst_ptr);
248 }
249 *dst_ptr += 4;
250 *src_ptr += 4;
251 break;
252
253 case R_IMM4L:
254 bfd_put_8 (in_abfd,
255 ((bfd_get_8 (in_abfd, data + *dst_ptr) & 0xf0)
256 | (0x0f & bfd_coff_reloc16_get_value (reloc, link_info,
257 input_section))),
258 data + *dst_ptr);
259 *dst_ptr += 1;
260 *src_ptr += 1;
261 break;
262
263 case R_IMM16:
264 bfd_put_16 (in_abfd,
265 bfd_coff_reloc16_get_value (reloc, link_info, input_section),
266 data + *dst_ptr);
267 *dst_ptr += 2;
268 *src_ptr += 2;
269 break;
270
271 case R_JR:
272 {
273 bfd_vma dst = bfd_coff_reloc16_get_value (reloc, link_info,
274 input_section);
275 bfd_vma dot = (*dst_ptr
276 + input_section->output_offset
277 + input_section->output_section->vma);
278 /* -1, since we're in the odd byte of the word and the pc has
279 been incremented. */
280 bfd_signed_vma gap = dst - dot - 1;
281
282 if ((gap & 1) != 0 || gap > 254 || gap < -256)
283 {
284 link_info->callbacks->reloc_overflow
285 (link_info, NULL, bfd_asymbol_name (*reloc->sym_ptr_ptr),
286 reloc->howto->name, reloc->addend, input_section->owner,
287 input_section, reloc->address);
288 return false;
289 }
290
291 bfd_put_8 (in_abfd, gap / 2, data + *dst_ptr);
292 *dst_ptr += 1;
293 *src_ptr += 1;
294 break;
295 }
296
297 case R_DISP7:
298 {
299 bfd_vma dst = bfd_coff_reloc16_get_value (reloc, link_info,
300 input_section);
301 bfd_vma dot = (*dst_ptr
302 + input_section->output_offset
303 + input_section->output_section->vma);
304 bfd_signed_vma gap = dst - dot - 1;
305
306 if ((gap & 1) != 0 || gap > 0 || gap < -254)
307 {
308 link_info->callbacks->reloc_overflow
309 (link_info, NULL, bfd_asymbol_name (*reloc->sym_ptr_ptr),
310 reloc->howto->name, reloc->addend, input_section->owner,
311 input_section, reloc->address);
312 return false;
313 }
314
315 bfd_put_8 (in_abfd,
316 ((bfd_get_8 (in_abfd, data + *dst_ptr) & 0x80)
317 + (-gap / 2 & 0x7f)),
318 data + *dst_ptr);
319 *dst_ptr += 1;
320 *src_ptr += 1;
321 break;
322 }
323
324 case R_CALLR:
325 {
326 bfd_vma dst = bfd_coff_reloc16_get_value (reloc, link_info,
327 input_section);
328 bfd_vma dot = (*dst_ptr
329 + input_section->output_offset
330 + input_section->output_section->vma);
331 bfd_signed_vma gap = dst - dot - 2;
332
333 if ((gap & 1) != 0 || gap > 4096 || gap < -4095)
334 {
335 link_info->callbacks->reloc_overflow
336 (link_info, NULL, bfd_asymbol_name (*reloc->sym_ptr_ptr),
337 reloc->howto->name, reloc->addend, input_section->owner,
338 input_section, reloc->address);
339 return false;
340 }
341
342 bfd_put_16 (in_abfd,
343 ((bfd_get_16 (in_abfd, data + *dst_ptr) & 0xf000)
344 | (-gap / 2 & 0x0fff)),
345 data + *dst_ptr);
346 *dst_ptr += 2;
347 *src_ptr += 2;
348 break;
349 }
350
351 case R_REL16:
352 {
353 bfd_vma dst = bfd_coff_reloc16_get_value (reloc, link_info,
354 input_section);
355 bfd_vma dot = (*dst_ptr
356 + input_section->output_offset
357 + input_section->output_section->vma);
358 bfd_signed_vma gap = dst - dot - 2;
359
360 if (gap > 32767 || gap < -32768)
361 {
362 link_info->callbacks->reloc_overflow
363 (link_info, NULL, bfd_asymbol_name (*reloc->sym_ptr_ptr),
364 reloc->howto->name, reloc->addend, input_section->owner,
365 input_section, reloc->address);
366 return false;
367 }
368
369 bfd_put_16 (in_abfd, gap, data + *dst_ptr);
370 *dst_ptr += 2;
371 *src_ptr += 2;
372 break;
373 }
374
375 default:
376 link_info->callbacks->einfo
377 /* xgettext:c-format */
378 (_("%X%P: %pB(%pA): relocation \"%pR\" is not supported\n"),
379 in_abfd, input_section, reloc);
380 return false;
381 }
382 return true;
383 }
384
385 #define coff_reloc16_extra_cases extra_case
386 #define coff_bfd_reloc_type_lookup coff_z8k_reloc_type_lookup
387 #define coff_bfd_reloc_name_lookup coff_z8k_reloc_name_lookup
388
389 #ifndef bfd_pe_print_pdata
390 #define bfd_pe_print_pdata NULL
391 #endif
392
393 #include "coffcode.h"
394
395 #undef coff_bfd_get_relocated_section_contents
396 #define coff_bfd_get_relocated_section_contents \
397 bfd_coff_reloc16_get_relocated_section_contents
398
399 #undef coff_bfd_relax_section
400 #define coff_bfd_relax_section bfd_coff_reloc16_relax_section
401
402 CREATE_BIG_COFF_TARGET_VEC (z8k_coff_vec, "coff-z8k", 0, 0, '_', NULL, COFF_SWAP_TABLE)