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2004-03-17 Paolo Bonzini <bonzini@gnu.org>
[binutils.git] / bfd / elf32-d30v.c
blobb08977f2f9674c66a2a1e152d3803d2aaf48de2d
1 /* D30V-specific support for 32-bit ELF
2 Copyright 1997, 1998, 1999, 2000, 2001, 2002
3 Free Software Foundation, Inc.
4 Contributed by Martin Hunt (hunt@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 2 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., 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 "elf-bfd.h"
26 #include "elf/d30v.h"
27
28 static reloc_howto_type *bfd_elf32_bfd_reloc_type_lookup
29 PARAMS ((bfd *abfd, bfd_reloc_code_real_type code));
30 static void d30v_info_to_howto_rel
31 PARAMS ((bfd *, arelent *, Elf_Internal_Rela *));
32 static void d30v_info_to_howto_rela
33 PARAMS ((bfd *, arelent *, Elf_Internal_Rela *));
34 static bfd_reloc_status_type bfd_elf_d30v_reloc PARAMS ((
35 bfd *abfd,
36 arelent *reloc_entry,
37 asymbol *symbol,
38 PTR data,
39 asection *input_section,
40 bfd *output_bfd,
41 char **error_message));
42 static bfd_reloc_status_type bfd_elf_d30v_reloc_21 PARAMS ((
43 bfd *abfd,
44 arelent *reloc_entry,
45 asymbol *symbol,
46 PTR data,
47 asection *input_section,
48 bfd *output_bfd,
49 char **error_message));
50
51 static reloc_howto_type elf_d30v_howto_table[] =
52 {
53 /* This reloc does nothing. */
54 HOWTO (R_D30V_NONE, /* type */
55 0, /* rightshift */
56 2, /* size (0 = byte, 1 = short, 2 = long) */
57 32, /* bitsize */
58 FALSE, /* pc_relative */
59 0, /* bitpos */
60 complain_overflow_bitfield, /* complain_on_overflow */
61 bfd_elf_generic_reloc, /* special_function */
62 "R_D30V_NONE", /* name */
63 FALSE, /* partial_inplace */
64 0, /* src_mask */
65 0, /* dst_mask */
66 FALSE), /* pcrel_offset */
67
68 /* A 6 bit absolute relocation */
69 HOWTO (R_D30V_6, /* type */
70 0, /* rightshift */
71 2, /* size (0 = byte, 1 = short, 2 = long) */
72 6, /* bitsize */
73 FALSE, /* pc_relative */
74 0, /* bitpos */
75 complain_overflow_bitfield, /* complain_on_overflow */
76 bfd_elf_generic_reloc, /* special_function */
77 "R_D30V_6", /* name */
78 FALSE, /* partial_inplace */
79 0x3f, /* src_mask */
80 0x3f, /* dst_mask */
81 FALSE), /* pcrel_offset */
82
83 /* A relative 9 bit relocation, right shifted by 3 */
84 HOWTO (R_D30V_9_PCREL, /* type */
85 3, /* rightshift */
86 2, /* size (0 = byte, 1 = short, 2 = long) */
87 6, /* bitsize */
88 TRUE, /* pc_relative */
89 0, /* bitpos */
90 complain_overflow_signed, /* complain_on_overflow */
91 bfd_elf_d30v_reloc_21, /* special_function */
92 "R_D30V_9_PCREL", /* name */
93 FALSE, /* partial_inplace */
94 0x3f, /* src_mask */
95 0x3f, /* dst_mask */
96 TRUE), /* pcrel_offset */
97
98 /* A relative 9 bit relocation, right shifted by 3 */
99 HOWTO (R_D30V_9_PCREL_R, /* type */
100 3, /* rightshift */
101 2, /* size (0 = byte, 1 = short, 2 = long) */
102 6, /* bitsize */
103 TRUE, /* pc_relative */
104 0, /* bitpos */
105 complain_overflow_signed, /* complain_on_overflow */
106 bfd_elf_d30v_reloc_21, /* special_function */
107 "R_D30V_9_PCREL_R", /* name */
108 FALSE, /* partial_inplace */
109 0x3f, /* src_mask */
110 0x3f, /* dst_mask */
111 TRUE), /* pcrel_offset */
112
113 /* An absolute 15 bit relocation, right shifted by 3 */
114 HOWTO (R_D30V_15, /* type */
115 3, /* rightshift */
116 2, /* size (0 = byte, 1 = short, 2 = long) */
117 12, /* bitsize */
118 FALSE, /* pc_relative */
119 0, /* bitpos */
120 complain_overflow_signed, /* complain_on_overflow */
121 bfd_elf_generic_reloc, /* special_function */
122 "R_D30V_15", /* name */
123 FALSE, /* partial_inplace */
124 0xfff, /* src_mask */
125 0xfff, /* dst_mask */
126 FALSE), /* pcrel_offset */
127
128 /* A relative 15 bit relocation, right shifted by 3 */
129 HOWTO (R_D30V_15_PCREL, /* type */
130 3, /* rightshift */
131 2, /* size (0 = byte, 1 = short, 2 = long) */
132 12, /* bitsize */
133 TRUE, /* pc_relative */
134 0, /* bitpos */
135 complain_overflow_signed, /* complain_on_overflow */
136 bfd_elf_d30v_reloc_21, /* special_function */
137 "R_D30V_15_PCREL", /* name */
138 FALSE, /* partial_inplace */
139 0xfff, /* src_mask */
140 0xfff, /* dst_mask */
141 TRUE), /* pcrel_offset */
142
143 /* A relative 15 bit relocation, right shifted by 3 */
144 HOWTO (R_D30V_15_PCREL_R, /* type */
145 3, /* rightshift */
146 2, /* size (0 = byte, 1 = short, 2 = long) */
147 12, /* bitsize */
148 TRUE, /* pc_relative */
149 0, /* bitpos */
150 complain_overflow_signed, /* complain_on_overflow */
151 bfd_elf_d30v_reloc_21, /* special_function */
152 "R_D30V_15_PCREL_R", /* name */
153 FALSE, /* partial_inplace */
154 0xfff, /* src_mask */
155 0xfff, /* dst_mask */
156 TRUE), /* pcrel_offset */
157
158 /* An absolute 21 bit relocation, right shifted by 3 */
159 HOWTO (R_D30V_21, /* type */
160 3, /* rightshift */
161 2, /* size (0 = byte, 1 = short, 2 = long) */
162 18, /* bitsize */
163 FALSE, /* pc_relative */
164 0, /* bitpos */
165 complain_overflow_signed, /* complain_on_overflow */
166 bfd_elf_generic_reloc, /* special_function */
167 "R_D30V_21", /* name */
168 FALSE, /* partial_inplace */
169 0x3ffff, /* src_mask */
170 0x3ffff, /* dst_mask */
171 FALSE), /* pcrel_offset */
172
173 /* A relative 21 bit relocation, right shifted by 3 */
174 HOWTO (R_D30V_21_PCREL, /* type */
175 3, /* rightshift */
176 2, /* size (0 = byte, 1 = short, 2 = long) */
177 18, /* bitsize */
178 TRUE, /* pc_relative */
179 0, /* bitpos */
180 complain_overflow_signed, /* complain_on_overflow */
181 bfd_elf_d30v_reloc_21, /* special_function */
182 "R_D30V_21_PCREL", /* name */
183 FALSE, /* partial_inplace */
184 0x3ffff, /* src_mask */
185 0x3ffff, /* dst_mask */
186 TRUE), /* pcrel_offset */
187
188 /* A relative 21 bit relocation, right shifted by 3, in the Right container */
189 HOWTO (R_D30V_21_PCREL_R, /* type */
190 3, /* rightshift */
191 2, /* size (0 = byte, 1 = short, 2 = long) */
192 18, /* bitsize */
193 TRUE, /* pc_relative */
194 0, /* bitpos */
195 complain_overflow_signed, /* complain_on_overflow */
196 bfd_elf_d30v_reloc_21, /* special_function */
197 "R_D30V_21_PCREL_R", /* name */
198 FALSE, /* partial_inplace */
199 0x3ffff, /* src_mask */
200 0x3ffff, /* dst_mask */
201 TRUE), /* pcrel_offset */
202
203 /* A D30V 32 bit absolute relocation */
204 HOWTO (R_D30V_32, /* type */
205 0, /* rightshift */
206 4, /* size (0 = byte, 1 = short, 2 = long) */
207 32, /* bitsize */
208 FALSE, /* pc_relative */
209 0, /* bitpos */
210 complain_overflow_bitfield, /* complain_on_overflow */
211 bfd_elf_d30v_reloc, /* special_function */
212 "R_D30V_32", /* name */
213 FALSE, /* partial_inplace */
214 0xffffffff, /* src_mask */
215 0xffffffff, /* dst_mask */
216 FALSE), /* pcrel_offset */
217
218 /* A relative 32 bit relocation */
219 HOWTO (R_D30V_32_PCREL, /* type */
220 0, /* rightshift */
221 4, /* size (0 = byte, 1 = short, 2 = long) */
222 32, /* bitsize */
223 TRUE, /* pc_relative */
224 0, /* bitpos */
225 complain_overflow_signed, /* complain_on_overflow */
226 bfd_elf_d30v_reloc, /* special_function */
227 "R_D30V_32_PCREL", /* name */
228 FALSE, /* partial_inplace */
229 0xffffffff, /* src_mask */
230 0xffffffff, /* dst_mask */
231 TRUE), /* pcrel_offset */
232
233 /* A regular 32 bit absolute relocation */
234 HOWTO (R_D30V_32_NORMAL, /* type */
235 0, /* rightshift */
236 2, /* size (0 = byte, 1 = short, 2 = long) */
237 32, /* bitsize */
238 FALSE, /* pc_relative */
239 0, /* bitpos */
240 complain_overflow_bitfield, /* complain_on_overflow */
241 bfd_elf_generic_reloc, /* special_function */
242 "R_D30V_32_NORMAL", /* name */
243 FALSE, /* partial_inplace */
244 0xffffffff, /* src_mask */
245 0xffffffff, /* dst_mask */
246 FALSE), /* pcrel_offset */
247
248 };
249
250 #define MAX32 ((bfd_signed_vma) 0x7fffffff)
251 #define MIN32 (- MAX32 - 1)
252
253 static bfd_reloc_status_type
254 bfd_elf_d30v_reloc (abfd, reloc_entry, symbol, data, input_section, output_bfd, error_message)
255 bfd *abfd;
256 arelent *reloc_entry;
257 asymbol *symbol;
258 PTR data;
259 asection *input_section;
260 bfd *output_bfd;
261 char **error_message;
262 {
263 bfd_signed_vma relocation;
264 bfd_vma in1, in2, num;
265 bfd_vma tmp_addr = 0;
266 bfd_reloc_status_type r;
267 asection *reloc_target_output_section;
268 bfd_size_type addr = reloc_entry->address;
269 bfd_reloc_status_type flag = bfd_reloc_ok;
270 bfd_vma output_base = 0;
271 reloc_howto_type *howto = reloc_entry->howto;
272 int make_absolute = 0;
273
274 if (output_bfd != (bfd *) NULL)
275 {
276 /* Partial linking -- do nothing. */
277 reloc_entry->address += input_section->output_offset;
278 return bfd_reloc_ok;
279 }
280
281 r = bfd_elf_generic_reloc (abfd, reloc_entry, symbol, data,
282 input_section, output_bfd, error_message);
283 if (r != bfd_reloc_continue)
284 return r;
285
286 /* a hacked-up version of bfd_perform_reloc() follows */
287 if (bfd_is_und_section (symbol->section)
288 && (symbol->flags & BSF_WEAK) == 0
289 && output_bfd == (bfd *) NULL)
290 flag = bfd_reloc_undefined;
291
292 /* Is the address of the relocation really within the section? */
293 if (reloc_entry->address > input_section->_cooked_size)
294 return bfd_reloc_outofrange;
295
296 /* Work out which section the relocation is targeted at and the
297 initial relocation command value. */
298
299 /* Get symbol value. (Common symbols are special.) */
300 if (bfd_is_com_section (symbol->section))
301 relocation = 0;
302 else
303 relocation = symbol->value;
304
305 reloc_target_output_section = symbol->section->output_section;
306
307 /* Convert input-section-relative symbol value to absolute. */
308 output_base = reloc_target_output_section->vma;
309 relocation += output_base + symbol->section->output_offset;
310
311 /* Add in supplied addend. */
312 relocation += reloc_entry->addend;
313
314 /* Here the variable relocation holds the final address of the
315 symbol we are relocating against, plus any addend. */
316
317 if (howto->pc_relative)
318 {
319 tmp_addr = input_section->output_section->vma + input_section->output_offset
320 + reloc_entry->address;
321 relocation -= tmp_addr;
322 }
323
324 in1 = bfd_get_32 (abfd, (bfd_byte *) data + addr);
325 in2 = bfd_get_32 (abfd, (bfd_byte *) data + addr + 4);
326
327 /* extract the addend */
328 num = ((in2 & 0x3FFFF)
329 | ((in2 & 0xFF00000) >> 2)
330 | ((in1 & 0x3F) << 26));
331 in1 &= 0xFFFFFFC0;
332 in2 = 0x80000000;
333
334 relocation += num;
335
336 if (howto->pc_relative && howto->bitsize == 32)
337 {
338 /* The D30V has a PC that doesn't wrap and PC-relative jumps are
339 signed, so a PC-relative jump can't be more than +/- 2^31 bytes.
340 If one exceeds this, change it to an absolute jump. */
341 if (relocation > MAX32 || relocation < MIN32)
342 {
343 relocation = (relocation + tmp_addr) & 0xffffffff;
344 make_absolute = 1;
345 }
346 }
347
348 in1 |= (relocation >> 26) & 0x3F; /* top 6 bits */
349 in2 |= ((relocation & 0x03FC0000) << 2); /* next 8 bits */
350 in2 |= relocation & 0x0003FFFF; /* bottom 18 bits */
351
352 /* change a PC-relative instruction to its absolute equivalent */
353 /* with this simple hack */
354 if (make_absolute)
355 in1 |= 0x00100000;
356
357 bfd_put_32 (abfd, in1, (bfd_byte *) data + addr);
358 bfd_put_32 (abfd, in2, (bfd_byte *) data + addr + 4);
359
360 return flag;
361 }
362
363 static bfd_reloc_status_type
364 bfd_elf_d30v_reloc_21 (abfd, reloc_entry, symbol, data, input_section, output_bfd, error_message)
365 bfd *abfd;
366 arelent *reloc_entry;
367 asymbol *symbol;
368 PTR data;
369 asection *input_section;
370 bfd *output_bfd;
371 char **error_message;
372 {
373 bfd_vma relocation;
374 bfd_vma in1, num;
375 bfd_reloc_status_type r;
376 asection *reloc_target_output_section;
377 bfd_size_type addr = reloc_entry->address;
378 bfd_reloc_status_type flag = bfd_reloc_ok;
379 bfd_vma output_base = 0;
380 reloc_howto_type *howto = reloc_entry->howto;
381 int mask, max;
382
383 if (output_bfd != (bfd *) NULL)
384 {
385 /* Partial linking -- do nothing. */
386 reloc_entry->address += input_section->output_offset;
387 return bfd_reloc_ok;
388 }
389
390 r = bfd_elf_generic_reloc (abfd, reloc_entry, symbol, data,
391 input_section, output_bfd, error_message);
392 if (r != bfd_reloc_continue)
393 return r;
394
395 /* a hacked-up version of bfd_perform_reloc() follows */
396 if (bfd_is_und_section (symbol->section)
397 && (symbol->flags & BSF_WEAK) == 0
398 && output_bfd == (bfd *) NULL)
399 flag = bfd_reloc_undefined;
400
401 /* Is the address of the relocation really within the section? */
402 if (reloc_entry->address > input_section->_cooked_size)
403 return bfd_reloc_outofrange;
404
405 /* Work out which section the relocation is targeted at and the
406 initial relocation command value. */
407
408 /* Get symbol value. (Common symbols are special.) */
409 if (bfd_is_com_section (symbol->section))
410 relocation = 0;
411 else
412 relocation = symbol->value;
413
414 reloc_target_output_section = symbol->section->output_section;
415
416 /* Convert input-section-relative symbol value to absolute. */
417 output_base = reloc_target_output_section->vma;
418 relocation += output_base + symbol->section->output_offset;
419
420 /* Add in supplied addend. */
421 relocation += reloc_entry->addend;
422
423 /* Here the variable relocation holds the final address of the
424 symbol we are relocating against, plus any addend. */
425
426 if (howto->pc_relative)
427 {
428 relocation -= (input_section->output_section->vma
429 + input_section->output_offset);
430 if (howto->pcrel_offset)
431 relocation -= reloc_entry->address;
432 }
433
434 in1 = bfd_get_32 (abfd, (bfd_byte *) data + addr);
435
436 mask = (1 << howto->bitsize) - 1;
437 if (howto->bitsize == 6)
438 mask <<= 12;
439 max = (1 << (howto->bitsize + 2)) - 1;
440
441 /* extract the addend */
442 num = in1 & mask; /* 18 bits */
443 if (howto->bitsize == 6)
444 num >>= 12;
445 num <<= 3; /* shift left 3 */
446 in1 &= ~mask; /* mask out addend */
447
448 relocation += num;
449 if (howto->type == R_D30V_21_PCREL_R || howto->type == R_D30V_15_PCREL_R ||
450 howto->type == R_D30V_9_PCREL_R )
451 {
452 relocation += 4;
453 }
454
455 if ((int)relocation < 0 )
456 {
457 if (~(int)relocation > max)
458 flag = bfd_reloc_overflow;
459 }
460 else
461 {
462 if ((int)relocation > max)
463 flag = bfd_reloc_overflow;
464 }
465 relocation >>= 3;
466 if (howto->bitsize == 6)
467 in1 |= ((relocation & (mask >> 12)) << 12);
468 else
469 in1 |= relocation & mask;
470
471 bfd_put_32 (abfd, in1, (bfd_byte *) data + addr);
472
473 return flag;
474 }
475
476 /* Map BFD reloc types to D30V ELF reloc types. */
477
478 struct d30v_reloc_map
479 {
480 bfd_reloc_code_real_type bfd_reloc_val;
481 unsigned char elf_reloc_val;
482 };
483
484 static const struct d30v_reloc_map d30v_reloc_map[] =
485 {
486 { BFD_RELOC_NONE, R_D30V_NONE, },
487 { BFD_RELOC_D30V_6, R_D30V_6 },
488 { BFD_RELOC_D30V_9_PCREL, R_D30V_9_PCREL },
489 { BFD_RELOC_D30V_9_PCREL_R, R_D30V_9_PCREL_R },
490 { BFD_RELOC_D30V_15, R_D30V_15 },
491 { BFD_RELOC_D30V_15_PCREL, R_D30V_15_PCREL },
492 { BFD_RELOC_D30V_15_PCREL_R, R_D30V_15_PCREL_R },
493 { BFD_RELOC_D30V_21, R_D30V_21 },
494 { BFD_RELOC_D30V_21_PCREL, R_D30V_21_PCREL },
495 { BFD_RELOC_D30V_21_PCREL_R, R_D30V_21_PCREL_R },
496 { BFD_RELOC_D30V_32, R_D30V_32 },
497 { BFD_RELOC_D30V_32_PCREL, R_D30V_32_PCREL },
498 { BFD_RELOC_32, R_D30V_32_NORMAL },
499 };
500
501 static reloc_howto_type *
502 bfd_elf32_bfd_reloc_type_lookup (abfd, code)
503 bfd *abfd ATTRIBUTE_UNUSED;
504 bfd_reloc_code_real_type code;
505 {
506 unsigned int i;
507
508 for (i = 0;
509 i < sizeof (d30v_reloc_map) / sizeof (struct d30v_reloc_map);
510 i++)
511 {
512 if (d30v_reloc_map[i].bfd_reloc_val == code)
513 return &elf_d30v_howto_table[d30v_reloc_map[i].elf_reloc_val];
514 }
515
516 return NULL;
517 }
518
519 /* Set the howto pointer for an D30V ELF reloc (type REL). */
520
521 static void
522 d30v_info_to_howto_rel (abfd, cache_ptr, dst)
523 bfd *abfd ATTRIBUTE_UNUSED;
524 arelent *cache_ptr;
525 Elf_Internal_Rela *dst;
526 {
527 unsigned int r_type;
528
529 r_type = ELF32_R_TYPE (dst->r_info);
530 BFD_ASSERT (r_type < (unsigned int) R_D30V_max);
531 cache_ptr->howto = &elf_d30v_howto_table[r_type];
532 }
533
534 /* Set the howto pointer for an D30V ELF reloc (type RELA). */
535
536 static void
537 d30v_info_to_howto_rela (abfd, cache_ptr, dst)
538 bfd *abfd ATTRIBUTE_UNUSED;
539 arelent *cache_ptr;
540 Elf_Internal_Rela *dst;
541 {
542 unsigned int r_type;
543
544 r_type = ELF32_R_TYPE (dst->r_info);
545 BFD_ASSERT (r_type < (unsigned int) R_D30V_max);
546 cache_ptr->howto = &elf_d30v_howto_table[r_type];
547 }
548
549 #define ELF_ARCH bfd_arch_d30v
550 #define ELF_MACHINE_CODE EM_D30V
551 #define ELF_MACHINE_ALT1 EM_CYGNUS_D30V
552 #define ELF_MAXPAGESIZE 0x1000
553
554 #define TARGET_BIG_SYM bfd_elf32_d30v_vec
555 #define TARGET_BIG_NAME "elf32-d30v"
556
557 #define elf_info_to_howto d30v_info_to_howto_rela
558 #define elf_info_to_howto_rel d30v_info_to_howto_rel
559 #define elf_backend_object_p 0
560 #define elf_backend_final_write_processing 0
561
562 #include "elf32-target.h"
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