1 /* D30V-specific support for 32-bit ELF
2 Copyright (C) 1997-2021 Free Software Foundation, Inc.
3 Contributed by Martin Hunt (hunt@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 "elf-bfd.h"
26 #include "elf/d30v.h"
27
28 #define MAX32 ((bfd_signed_vma) 0x7fffffff)
29 #define MIN32 (- MAX32 - 1)
30
31 static bfd_reloc_status_type
bfd_elf_d30v_reloc(bfd * abfd,arelent * reloc_entry,asymbol * symbol,void * data,asection * input_section,bfd * output_bfd,char ** error_message)32 bfd_elf_d30v_reloc (bfd *abfd,
33 arelent *reloc_entry,
34 asymbol *symbol,
35 void * data,
36 asection *input_section,
37 bfd *output_bfd,
38 char **error_message)
39 {
40 bfd_signed_vma relocation;
41 bfd_vma in1, in2, num;
42 bfd_vma tmp_addr = 0;
43 bfd_reloc_status_type r;
44 asection *reloc_target_output_section;
45 bfd_size_type addr = reloc_entry->address;
46 bfd_reloc_status_type flag = bfd_reloc_ok;
47 bfd_vma output_base = 0;
48 reloc_howto_type *howto = reloc_entry->howto;
49 int make_absolute = 0;
50
51 if (output_bfd != NULL)
52 {
53 /* Partial linking -- do nothing. */
54 reloc_entry->address += input_section->output_offset;
55 return bfd_reloc_ok;
56 }
57
58 r = bfd_elf_generic_reloc (abfd, reloc_entry, symbol, data,
59 input_section, output_bfd, error_message);
60 if (r != bfd_reloc_continue)
61 return r;
62
63 /* A hacked-up version of bfd_perform_reloc() follows. */
64 if (bfd_is_und_section (symbol->section)
65 && (symbol->flags & BSF_WEAK) == 0
66 && output_bfd == NULL)
67 flag = bfd_reloc_undefined;
68
69 /* Is the address of the relocation really within the section? */
70 if (reloc_entry->address > bfd_get_section_limit (abfd, input_section))
71 return bfd_reloc_outofrange;
72
73 /* Work out which section the relocation is targeted at and the
74 initial relocation command value. */
75
76 /* Get symbol value. (Common symbols are special.) */
77 if (bfd_is_com_section (symbol->section))
78 relocation = 0;
79 else
80 relocation = symbol->value;
81
82 reloc_target_output_section = symbol->section->output_section;
83
84 /* Convert input-section-relative symbol value to absolute. */
85 output_base = reloc_target_output_section->vma;
86 relocation += output_base + symbol->section->output_offset;
87
88 /* Add in supplied addend. */
89 relocation += reloc_entry->addend;
90
91 /* Here the variable relocation holds the final address of the
92 symbol we are relocating against, plus any addend. */
93 if (howto->pc_relative)
94 {
95 tmp_addr = input_section->output_section->vma
96 + input_section->output_offset
97 + reloc_entry->address;
98 relocation -= tmp_addr;
99 }
100
101 in1 = bfd_get_32 (abfd, (bfd_byte *) data + addr);
102 in2 = bfd_get_32 (abfd, (bfd_byte *) data + addr + 4);
103
104 /* Extract the addend. */
105 num = ((in2 & 0x3FFFF)
106 | ((in2 & 0xFF00000) >> 2)
107 | ((in1 & 0x3F) << 26));
108 in1 &= 0xFFFFFFC0;
109 in2 = 0x80000000;
110
111 relocation += num;
112
113 if (howto->pc_relative && howto->bitsize == 32)
114 {
115 /* The D30V has a PC that doesn't wrap and PC-relative jumps are
116 signed, so a PC-relative jump can't be more than +/- 2^31 bytes.
117 If one exceeds this, change it to an absolute jump. */
118 if (relocation > MAX32 || relocation < MIN32)
119 {
120 relocation = (relocation + tmp_addr) & 0xffffffff;
121 make_absolute = 1;
122 }
123 }
124
125 in1 |= (relocation >> 26) & 0x3F; /* Top 6 bits. */
126 in2 |= ((relocation & 0x03FC0000) << 2); /* Next 8 bits. */
127 in2 |= relocation & 0x0003FFFF; /* Bottom 18 bits. */
128
129 /* Change a PC-relative instruction to its
130 absolute equivalent with this simple hack. */
131 if (make_absolute)
132 in1 |= 0x00100000;
133
134 bfd_put_32 (abfd, in1, (bfd_byte *) data + addr);
135 bfd_put_32 (abfd, in2, (bfd_byte *) data + addr + 4);
136
137 return flag;
138 }
139
140 static bfd_reloc_status_type
bfd_elf_d30v_reloc_21(bfd * abfd,arelent * reloc_entry,asymbol * symbol,void * data,asection * input_section,bfd * output_bfd,char ** error_message)141 bfd_elf_d30v_reloc_21 (bfd *abfd,
142 arelent *reloc_entry,
143 asymbol *symbol,
144 void * data,
145 asection *input_section,
146 bfd *output_bfd,
147 char **error_message)
148 {
149 bfd_vma relocation;
150 bfd_vma in1, num;
151 bfd_reloc_status_type r;
152 asection *reloc_target_output_section;
153 bfd_size_type addr = reloc_entry->address;
154 bfd_reloc_status_type flag = bfd_reloc_ok;
155 bfd_vma output_base = 0;
156 reloc_howto_type *howto = reloc_entry->howto;
157 int mask, max;
158
159 if (output_bfd != NULL)
160 {
161 /* Partial linking -- do nothing. */
162 reloc_entry->address += input_section->output_offset;
163 return bfd_reloc_ok;
164 }
165
166 r = bfd_elf_generic_reloc (abfd, reloc_entry, symbol, data,
167 input_section, output_bfd, error_message);
168 if (r != bfd_reloc_continue)
169 return r;
170
171 /* A hacked-up version of bfd_perform_reloc() follows. */
172 if (bfd_is_und_section (symbol->section)
173 && (symbol->flags & BSF_WEAK) == 0
174 && output_bfd == NULL)
175 flag = bfd_reloc_undefined;
176
177 /* Is the address of the relocation really within the section? */
178 if (reloc_entry->address > bfd_get_section_limit (abfd, input_section))
179 return bfd_reloc_outofrange;
180
181 /* Work out which section the relocation is targeted at and the
182 initial relocation command value. */
183
184 /* Get symbol value. (Common symbols are special.) */
185 if (bfd_is_com_section (symbol->section))
186 relocation = 0;
187 else
188 relocation = symbol->value;
189
190 reloc_target_output_section = symbol->section->output_section;
191
192 /* Convert input-section-relative symbol value to absolute. */
193 output_base = reloc_target_output_section->vma;
194 relocation += output_base + symbol->section->output_offset;
195
196 /* Add in supplied addend. */
197 relocation += reloc_entry->addend;
198
199 /* Here the variable relocation holds the final address of the
200 symbol we are relocating against, plus any addend. */
201
202 if (howto->pc_relative)
203 {
204 relocation -= (input_section->output_section->vma
205 + input_section->output_offset);
206 if (howto->pcrel_offset)
207 relocation -= reloc_entry->address;
208 }
209
210 in1 = bfd_get_32 (abfd, (bfd_byte *) data + addr);
211
212 mask = (1 << howto->bitsize) - 1;
213 if (howto->bitsize == 6)
214 mask <<= 12;
215 max = (1 << (howto->bitsize + 2)) - 1;
216
217 /* Extract the addend. */
218 num = in1 & mask; /* 18 bits. */
219 if (howto->bitsize == 6)
220 num >>= 12;
221 num <<= 3; /* shift left 3. */
222 in1 &= ~mask; /* Mask out addend. */
223
224 relocation += num;
225 if (howto->type == R_D30V_21_PCREL_R
226 || howto->type == R_D30V_15_PCREL_R
227 || howto->type == R_D30V_9_PCREL_R)
228 relocation += 4;
229
230 if ((int) relocation < 0)
231 {
232 if (~ (int) relocation > max)
233 flag = bfd_reloc_overflow;
234 }
235 else
236 {
237 if ((int) relocation > max)
238 flag = bfd_reloc_overflow;
239 }
240
241 relocation >>= 3;
242 if (howto->bitsize == 6)
243 in1 |= ((relocation & (mask >> 12)) << 12);
244 else
245 in1 |= relocation & mask;
246
247 bfd_put_32 (abfd, in1, (bfd_byte *) data + addr);
248
249 return flag;
250 }
251
252 static reloc_howto_type elf_d30v_howto_table[] =
253 {
254 /* This reloc does nothing. */
255 HOWTO (R_D30V_NONE, /* Type. */
256 0, /* Rightshift. */
257 3, /* Size (0 = byte, 1 = short, 2 = long). */
258 0, /* Bitsize. */
259 false, /* PC_relative. */
260 0, /* Bitpos. */
261 complain_overflow_dont, /* Complain_on_overflow. */
262 bfd_elf_generic_reloc, /* Special_function. */
263 "R_D30V_NONE", /* Name. */
264 false, /* Partial_inplace. */
265 0, /* Src_mask. */
266 0, /* Dst_mask. */
267 false), /* PCrel_offset. */
268
269 /* A 6 bit absolute relocation. */
270 HOWTO (R_D30V_6, /* Type. */
271 0, /* Rightshift. */
272 2, /* Size (0 = byte, 1 = short, 2 = long). */
273 6, /* Bitsize. */
274 false, /* PC_relative. */
275 0, /* Bitpos. */
276 complain_overflow_bitfield, /* Complain_on_overflow. */
277 bfd_elf_generic_reloc, /* Special_function. */
278 "R_D30V_6", /* Name. */
279 false, /* Partial_inplace. */
280 0x3f, /* Src_mask. */
281 0x3f, /* Dst_mask. */
282 false), /* PCrel_offset. */
283
284 /* A relative 9 bit relocation, right shifted by 3. */
285 HOWTO (R_D30V_9_PCREL, /* Type. */
286 3, /* Rightshift. */
287 2, /* Size (0 = byte, 1 = short, 2 = long). */
288 6, /* Bitsize. */
289 true, /* PC_relative. */
290 0, /* Bitpos. */
291 complain_overflow_signed, /* Complain_on_overflow. */
292 bfd_elf_d30v_reloc_21, /* Special_function. */
293 "R_D30V_9_PCREL", /* Name. */
294 false, /* Partial_inplace. */
295 0x3f, /* Src_mask. */
296 0x3f, /* Dst_mask. */
297 true), /* PCrel_offset. */
298
299 /* A relative 9 bit relocation, right shifted by 3. */
300 HOWTO (R_D30V_9_PCREL_R, /* Type. */
301 3, /* Rightshift. */
302 2, /* Size (0 = byte, 1 = short, 2 = long). */
303 6, /* Bitsize. */
304 true, /* PC_relative. */
305 0, /* Bitpos. */
306 complain_overflow_signed, /* Complain_on_overflow. */
307 bfd_elf_d30v_reloc_21, /* Special_function. */
308 "R_D30V_9_PCREL_R", /* Name. */
309 false, /* Partial_inplace. */
310 0x3f, /* Src_mask. */
311 0x3f, /* Dst_mask. */
312 true), /* PCrel_offset. */
313
314 /* An absolute 15 bit relocation, right shifted by 3. */
315 HOWTO (R_D30V_15, /* Type. */
316 3, /* Rightshift. */
317 2, /* Size (0 = byte, 1 = short, 2 = long). */
318 12, /* Bitsize. */
319 false, /* PC_relative. */
320 0, /* Bitpos. */
321 complain_overflow_signed, /* Complain_on_overflow. */
322 bfd_elf_generic_reloc, /* Special_function. */
323 "R_D30V_15", /* Name. */
324 false, /* Partial_inplace. */
325 0xfff, /* Src_mask. */
326 0xfff, /* Dst_mask. */
327 false), /* PCrel_offset. */
328
329 /* A relative 15 bit relocation, right shifted by 3. */
330 HOWTO (R_D30V_15_PCREL, /* Type. */
331 3, /* Rightshift. */
332 2, /* Size (0 = byte, 1 = short, 2 = long). */
333 12, /* Bitsize. */
334 true, /* PC_relative. */
335 0, /* Bitpos. */
336 complain_overflow_signed, /* Complain_on_overflow. */
337 bfd_elf_d30v_reloc_21, /* Special_function. */
338 "R_D30V_15_PCREL", /* Name. */
339 false, /* Partial_inplace. */
340 0xfff, /* Src_mask. */
341 0xfff, /* Dst_mask. */
342 true), /* PCrel_offset. */
343
344 /* A relative 15 bit relocation, right shifted by 3. */
345 HOWTO (R_D30V_15_PCREL_R, /* Type. */
346 3, /* Rightshift. */
347 2, /* Size (0 = byte, 1 = short, 2 = long). */
348 12, /* Bitsize. */
349 true, /* PC_relative. */
350 0, /* Bitpos. */
351 complain_overflow_signed, /* Complain_on_overflow. */
352 bfd_elf_d30v_reloc_21, /* Special_function. */
353 "R_D30V_15_PCREL_R", /* Name. */
354 false, /* Partial_inplace. */
355 0xfff, /* Src_mask. */
356 0xfff, /* Dst_mask. */
357 true), /* PCrel_offset. */
358
359 /* An absolute 21 bit relocation, right shifted by 3. */
360 HOWTO (R_D30V_21, /* Type. */
361 3, /* Rightshift. */
362 2, /* Size (0 = byte, 1 = short, 2 = long). */
363 18, /* Bitsize. */
364 false, /* PC_relative. */
365 0, /* Bitpos. */
366 complain_overflow_signed, /* Complain_on_overflow. */
367 bfd_elf_generic_reloc, /* Special_function. */
368 "R_D30V_21", /* Name. */
369 false, /* Partial_inplace. */
370 0x3ffff, /* Src_mask. */
371 0x3ffff, /* Dst_mask. */
372 false), /* PCrel_offset. */
373
374 /* A relative 21 bit relocation, right shifted by 3. */
375 HOWTO (R_D30V_21_PCREL, /* Type. */
376 3, /* Rightshift. */
377 2, /* Size (0 = byte, 1 = short, 2 = long). */
378 18, /* Bitsize. */
379 true, /* PC_relative. */
380 0, /* Bitpos. */
381 complain_overflow_signed, /* Complain_on_overflow. */
382 bfd_elf_d30v_reloc_21, /* Special_function. */
383 "R_D30V_21_PCREL", /* Name. */
384 false, /* Partial_inplace. */
385 0x3ffff, /* Src_mask. */
386 0x3ffff, /* Dst_mask. */
387 true), /* PCrel_offset. */
388
389 /* A relative 21 bit relocation, right shifted by 3, in the Right container. */
390 HOWTO (R_D30V_21_PCREL_R, /* Type. */
391 3, /* Rightshift. */
392 2, /* Size (0 = byte, 1 = short, 2 = long). */
393 18, /* Bitsize. */
394 true, /* PC_relative. */
395 0, /* Bitpos. */
396 complain_overflow_signed, /* Complain_on_overflow. */
397 bfd_elf_d30v_reloc_21, /* Special_function. */
398 "R_D30V_21_PCREL_R", /* Name. */
399 false, /* Partial_inplace. */
400 0x3ffff, /* Src_mask. */
401 0x3ffff, /* Dst_mask. */
402 true), /* PCrel_offset. */
403
404 /* A D30V 32 bit absolute relocation. */
405 HOWTO (R_D30V_32, /* Type. */
406 0, /* Rightshift. */
407 4, /* Size (0 = byte, 1 = short, 2 = long). */
408 32, /* Bitsize. */
409 false, /* PC_relative. */
410 0, /* Bitpos. */
411 complain_overflow_bitfield, /* Complain_on_overflow. */
412 bfd_elf_d30v_reloc, /* Special_function. */
413 "R_D30V_32", /* Name. */
414 false, /* Partial_inplace. */
415 0xffffffff, /* Src_mask. */
416 0xffffffff, /* Dst_mask. */
417 false), /* PCrel_offset. */
418
419 /* A relative 32 bit relocation. */
420 HOWTO (R_D30V_32_PCREL, /* Type. */
421 0, /* Rightshift. */
422 4, /* Size (0 = byte, 1 = short, 2 = long). */
423 32, /* Bitsize. */
424 true, /* PC_relative. */
425 0, /* Bitpos. */
426 complain_overflow_signed, /* Complain_on_overflow. */
427 bfd_elf_d30v_reloc, /* Special_function. */
428 "R_D30V_32_PCREL", /* Name. */
429 false, /* Partial_inplace. */
430 0xffffffff, /* Src_mask. */
431 0xffffffff, /* Dst_mask. */
432 true), /* PCrel_offset. */
433
434 /* A regular 32 bit absolute relocation. */
435 HOWTO (R_D30V_32_NORMAL, /* Type. */
436 0, /* Rightshift. */
437 2, /* Size (0 = byte, 1 = short, 2 = long). */
438 32, /* Bitsize. */
439 false, /* PC_relative. */
440 0, /* Bitpos. */
441 complain_overflow_bitfield, /* Complain_on_overflow. */
442 bfd_elf_generic_reloc, /* Special_function. */
443 "R_D30V_32_NORMAL", /* Name. */
444 false, /* Partial_inplace. */
445 0xffffffff, /* Src_mask. */
446 0xffffffff, /* Dst_mask. */
447 false), /* PCrel_offset. */
448
449 };
450
451 /* Map BFD reloc types to D30V ELF reloc types. */
452
453 struct d30v_reloc_map
454 {
455 bfd_reloc_code_real_type bfd_reloc_val;
456 unsigned char elf_reloc_val;
457 };
458
459 static const struct d30v_reloc_map d30v_reloc_map[] =
460 {
461 { BFD_RELOC_NONE, R_D30V_NONE, },
462 { BFD_RELOC_D30V_6, R_D30V_6 },
463 { BFD_RELOC_D30V_9_PCREL, R_D30V_9_PCREL },
464 { BFD_RELOC_D30V_9_PCREL_R, R_D30V_9_PCREL_R },
465 { BFD_RELOC_D30V_15, R_D30V_15 },
466 { BFD_RELOC_D30V_15_PCREL, R_D30V_15_PCREL },
467 { BFD_RELOC_D30V_15_PCREL_R, R_D30V_15_PCREL_R },
468 { BFD_RELOC_D30V_21, R_D30V_21 },
469 { BFD_RELOC_D30V_21_PCREL, R_D30V_21_PCREL },
470 { BFD_RELOC_D30V_21_PCREL_R, R_D30V_21_PCREL_R },
471 { BFD_RELOC_D30V_32, R_D30V_32 },
472 { BFD_RELOC_D30V_32_PCREL, R_D30V_32_PCREL },
473 { BFD_RELOC_32, R_D30V_32_NORMAL },
474 };
475
476 static reloc_howto_type *
bfd_elf32_bfd_reloc_type_lookup(bfd * abfd ATTRIBUTE_UNUSED,bfd_reloc_code_real_type code)477 bfd_elf32_bfd_reloc_type_lookup (bfd *abfd ATTRIBUTE_UNUSED,
478 bfd_reloc_code_real_type code)
479 {
480 unsigned int i;
481
482 for (i = 0;
483 i < sizeof (d30v_reloc_map) / sizeof (struct d30v_reloc_map);
484 i++)
485 {
486 if (d30v_reloc_map[i].bfd_reloc_val == code)
487 return &elf_d30v_howto_table[d30v_reloc_map[i].elf_reloc_val];
488 }
489
490 return NULL;
491 }
492
493 static reloc_howto_type *
bfd_elf32_bfd_reloc_name_lookup(bfd * abfd ATTRIBUTE_UNUSED,const char * r_name)494 bfd_elf32_bfd_reloc_name_lookup (bfd *abfd ATTRIBUTE_UNUSED,
495 const char *r_name)
496 {
497 unsigned int i;
498
499 for (i = 0;
500 i < sizeof (elf_d30v_howto_table) / sizeof (elf_d30v_howto_table[0]);
501 i++)
502 if (elf_d30v_howto_table[i].name != NULL
503 && strcasecmp (elf_d30v_howto_table[i].name, r_name) == 0)
504 return &elf_d30v_howto_table[i];
505
506 return NULL;
507 }
508
509 /* Set the howto pointer for an D30V ELF reloc (type REL). */
510
511 static bool
d30v_info_to_howto_rel(bfd * abfd,arelent * cache_ptr,Elf_Internal_Rela * dst)512 d30v_info_to_howto_rel (bfd *abfd,
513 arelent *cache_ptr,
514 Elf_Internal_Rela *dst)
515 {
516 unsigned int r_type;
517
518 r_type = ELF32_R_TYPE (dst->r_info);
519 if (r_type >= (unsigned int) R_D30V_max)
520 {
521 /* xgettext:c-format */
522 _bfd_error_handler (_("%pB: unsupported relocation type %#x"),
523 abfd, r_type);
524 bfd_set_error (bfd_error_bad_value);
525 return false;
526 }
527 cache_ptr->howto = &elf_d30v_howto_table[r_type];
528 return true;
529 }
530
531 /* Set the howto pointer for an D30V ELF reloc (type RELA). */
532
533 static bool
d30v_info_to_howto_rela(bfd * abfd,arelent * cache_ptr,Elf_Internal_Rela * dst)534 d30v_info_to_howto_rela (bfd *abfd,
535 arelent *cache_ptr,
536 Elf_Internal_Rela *dst)
537 {
538 unsigned int r_type;
539
540 r_type = ELF32_R_TYPE (dst->r_info);
541 if (r_type >= (unsigned int) R_D30V_max)
542 {
543 /* xgettext:c-format */
544 _bfd_error_handler (_("%pB: unsupported relocation type %#x"),
545 abfd, r_type);
546 bfd_set_error (bfd_error_bad_value);
547 return false;
548 }
549 cache_ptr->howto = &elf_d30v_howto_table[r_type];
550 return true;
551 }
552
553 #define ELF_ARCH bfd_arch_d30v
554 #define ELF_MACHINE_CODE EM_D30V
555 #define ELF_MACHINE_ALT1 EM_CYGNUS_D30V
556 #define ELF_MAXPAGESIZE 0x1000
557
558 #define TARGET_BIG_SYM d30v_elf32_vec
559 #define TARGET_BIG_NAME "elf32-d30v"
560
561 #define elf_info_to_howto d30v_info_to_howto_rela
562 #define elf_info_to_howto_rel d30v_info_to_howto_rel
563 #define elf_backend_object_p 0
564
565 #include "elf32-target.h"
566