* elf32-spu.c (build_stub): Fix malloc under-allocation.
[binutils.git] / bfd / elf32-xstormy16.c
blob614178337e9a86c82d4808aa2133bf136c9354c8
1 /* Xstormy16-specific support for 32-bit ELF.
2 Copyright 2000, 2001, 2002, 2003, 2004, 2005, 2006, 2007, 2010, 2011
3 Free Software Foundation, Inc.
5 This file is part of BFD, the Binary File Descriptor library.
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.
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.
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. */
22 #include "sysdep.h"
23 #include "bfd.h"
24 #include "libbfd.h"
25 #include "elf-bfd.h"
26 #include "elf/xstormy16.h"
27 #include "libiberty.h"
29 /* Handle the R_XSTORMY16_24 reloc, which has an odd bit arrangement. */
31 static bfd_reloc_status_type
32 xstormy16_elf_24_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 ATTRIBUTE_UNUSED)
40 bfd_vma relocation, x;
42 if (output_bfd != NULL)
44 reloc_entry->address += input_section->output_offset;
45 return bfd_reloc_ok;
48 if (reloc_entry->address > bfd_get_section_limit (abfd, input_section))
49 return bfd_reloc_outofrange;
51 if (bfd_is_com_section (symbol->section))
52 relocation = 0;
53 else
54 relocation = symbol->value;
56 relocation += symbol->section->output_section->vma;
57 relocation += symbol->section->output_offset;
58 relocation += reloc_entry->addend;
60 x = bfd_get_32 (abfd, (bfd_byte *) data + reloc_entry->address);
61 x &= 0x0000ff00;
62 x |= relocation & 0xff;
63 x |= (relocation << 8) & 0xffff0000;
64 bfd_put_32 (abfd, x, (bfd_byte *) data + reloc_entry->address);
66 if (relocation & ~ (bfd_vma) 0xffffff)
67 return bfd_reloc_overflow;
69 return bfd_reloc_ok;
72 static reloc_howto_type xstormy16_elf_howto_table [] =
74 /* This reloc does nothing. */
75 HOWTO (R_XSTORMY16_NONE, /* type */
76 0, /* rightshift */
77 2, /* size (0 = byte, 1 = short, 2 = long) */
78 32, /* bitsize */
79 FALSE, /* pc_relative */
80 0, /* bitpos */
81 complain_overflow_bitfield, /* complain_on_overflow */
82 bfd_elf_generic_reloc, /* special_function */
83 "R_XSTORMY16_NONE", /* name */
84 FALSE, /* partial_inplace */
85 0, /* src_mask */
86 0, /* dst_mask */
87 FALSE), /* pcrel_offset */
89 /* A 32 bit absolute relocation. */
90 HOWTO (R_XSTORMY16_32, /* type */
91 0, /* rightshift */
92 2, /* size (0 = byte, 1 = short, 2 = long) */
93 32, /* bitsize */
94 FALSE, /* pc_relative */
95 0, /* bitpos */
96 complain_overflow_dont, /* complain_on_overflow */
97 bfd_elf_generic_reloc, /* special_function */
98 "R_XSTORMY16_32", /* name */
99 FALSE, /* partial_inplace */
100 0, /* src_mask */
101 0xffffffff, /* dst_mask */
102 FALSE), /* pcrel_offset */
104 /* A 16 bit absolute relocation. */
105 HOWTO (R_XSTORMY16_16, /* type */
106 0, /* rightshift */
107 1, /* size (0 = byte, 1 = short, 2 = long) */
108 16, /* bitsize */
109 FALSE, /* pc_relative */
110 0, /* bitpos */
111 complain_overflow_bitfield, /* complain_on_overflow */
112 bfd_elf_generic_reloc, /* special_function */
113 "R_XSTORMY16_16", /* name */
114 FALSE, /* partial_inplace */
115 0, /* src_mask */
116 0xffff, /* dst_mask */
117 FALSE), /* pcrel_offset */
119 /* An 8 bit absolute relocation. */
120 HOWTO (R_XSTORMY16_8, /* type */
121 0, /* rightshift */
122 0, /* size (0 = byte, 1 = short, 2 = long) */
123 8, /* bitsize */
124 FALSE, /* pc_relative */
125 0, /* bitpos */
126 complain_overflow_unsigned, /* complain_on_overflow */
127 bfd_elf_generic_reloc, /* special_function */
128 "R_XSTORMY16_8", /* name */
129 FALSE, /* partial_inplace */
130 0, /* src_mask */
131 0xff, /* dst_mask */
132 FALSE), /* pcrel_offset */
134 /* A 32 bit pc-relative relocation. */
135 HOWTO (R_XSTORMY16_PC32, /* type */
136 0, /* rightshift */
137 2, /* size (0 = byte, 1 = short, 2 = long) */
138 32, /* bitsize */
139 TRUE, /* pc_relative */
140 0, /* bitpos */
141 complain_overflow_dont, /* complain_on_overflow */
142 bfd_elf_generic_reloc, /* special_function */
143 "R_XSTORMY16_PC32", /* name */
144 FALSE, /* partial_inplace */
145 0, /* src_mask */
146 0xffffffff, /* dst_mask */
147 TRUE), /* pcrel_offset */
149 /* A 16 bit pc-relative relocation. */
150 HOWTO (R_XSTORMY16_PC16, /* type */
151 0, /* rightshift */
152 1, /* size (0 = byte, 1 = short, 2 = long) */
153 16, /* bitsize */
154 TRUE, /* pc_relative */
155 0, /* bitpos */
156 complain_overflow_signed, /* complain_on_overflow */
157 bfd_elf_generic_reloc, /* special_function */
158 "R_XSTORMY16_PC16", /* name */
159 FALSE, /* partial_inplace */
160 0, /* src_mask */
161 0xffffffff, /* dst_mask */
162 TRUE), /* pcrel_offset */
164 /* An 8 bit pc-relative relocation. */
165 HOWTO (R_XSTORMY16_PC8, /* type */
166 0, /* rightshift */
167 0, /* size (0 = byte, 1 = short, 2 = long) */
168 8, /* bitsize */
169 TRUE, /* pc_relative */
170 0, /* bitpos */
171 complain_overflow_signed, /* complain_on_overflow */
172 bfd_elf_generic_reloc, /* special_function */
173 "R_XSTORMY16_PC8", /* name */
174 FALSE, /* partial_inplace */
175 0, /* src_mask */
176 0xffffffff, /* dst_mask */
177 TRUE), /* pcrel_offset */
179 /* A 12-bit pc-relative relocation suitable for the branch instructions. */
180 HOWTO (R_XSTORMY16_REL_12, /* type */
181 1, /* rightshift */
182 1, /* size (0 = byte, 1 = short, 2 = long) */
183 11, /* bitsize */
184 TRUE, /* pc_relative */
185 1, /* bitpos */
186 complain_overflow_signed, /* complain_on_overflow */
187 bfd_elf_generic_reloc, /* special_function */
188 "R_XSTORMY16_REL_12", /* name */
189 FALSE, /* partial_inplace */
190 0, /* src_mask */
191 0x0ffe, /* dst_mask */
192 TRUE), /* pcrel_offset */
194 /* A 24-bit absolute relocation suitable for the jump instructions. */
195 HOWTO (R_XSTORMY16_24, /* type */
196 0, /* rightshift */
197 2, /* size (0 = byte, 1 = short, 2 = long) */
198 24, /* bitsize */
199 FALSE, /* pc_relative */
200 0, /* bitpos */
201 complain_overflow_unsigned, /* complain_on_overflow */
202 xstormy16_elf_24_reloc, /* special_function */
203 "R_XSTORMY16_24", /* name */
204 TRUE, /* partial_inplace */
205 0, /* src_mask */
206 0xffff00ff, /* dst_mask */
207 TRUE), /* pcrel_offset */
209 /* A 16 bit absolute relocation to a function pointer. */
210 HOWTO (R_XSTORMY16_FPTR16, /* type */
211 0, /* rightshift */
212 1, /* size (0 = byte, 1 = short, 2 = long) */
213 16, /* bitsize */
214 FALSE, /* pc_relative */
215 0, /* bitpos */
216 complain_overflow_bitfield, /* complain_on_overflow */
217 bfd_elf_generic_reloc, /* special_function */
218 "R_XSTORMY16_FPTR16", /* name */
219 FALSE, /* partial_inplace */
220 0, /* src_mask */
221 0xffffffff, /* dst_mask */
222 FALSE), /* pcrel_offset */
224 /* Low order 16 bit value of a high memory address. */
225 HOWTO (R_XSTORMY16_LO16, /* type */
226 0, /* rightshift */
227 1, /* size (0 = byte, 1 = short, 2 = long) */
228 16, /* bitsize */
229 FALSE, /* pc_relative */
230 0, /* bitpos */
231 complain_overflow_dont, /* complain_on_overflow */
232 bfd_elf_generic_reloc, /* special_function */
233 "R_XSTORMY16_LO16", /* name */
234 FALSE, /* partial_inplace */
235 0, /* src_mask */
236 0xffff, /* dst_mask */
237 FALSE), /* pcrel_offset */
239 /* High order 16 bit value of a high memory address. */
240 HOWTO (R_XSTORMY16_HI16, /* type */
241 16, /* rightshift */
242 1, /* size (0 = byte, 1 = short, 2 = long) */
243 16, /* bitsize */
244 FALSE, /* pc_relative */
245 0, /* bitpos */
246 complain_overflow_dont, /* complain_on_overflow */
247 bfd_elf_generic_reloc, /* special_function */
248 "R_XSTORMY16_HI16", /* name */
249 FALSE, /* partial_inplace */
250 0, /* src_mask */
251 0xffff, /* dst_mask */
252 FALSE), /* pcrel_offset */
254 /* A 12 bit absolute relocation. */
255 HOWTO (R_XSTORMY16_12, /* type */
256 0, /* rightshift */
257 1, /* size (0 = byte, 1 = short, 2 = long) */
258 12, /* bitsize */
259 FALSE, /* pc_relative */
260 0, /* bitpos */
261 complain_overflow_signed, /* complain_on_overflow */
262 bfd_elf_generic_reloc, /* special_function */
263 "R_XSTORMY16_12", /* name */
264 FALSE, /* partial_inplace */
265 0x0000, /* src_mask */
266 0x0fff, /* dst_mask */
267 FALSE), /* pcrel_offset */
270 static reloc_howto_type xstormy16_elf_howto_table2 [] =
272 /* GNU extension to record C++ vtable hierarchy */
273 HOWTO (R_XSTORMY16_GNU_VTINHERIT, /* type */
274 0, /* rightshift */
275 2, /* size (0 = byte, 1 = short, 2 = long) */
276 0, /* bitsize */
277 FALSE, /* pc_relative */
278 0, /* bitpos */
279 complain_overflow_dont, /* complain_on_overflow */
280 NULL, /* special_function */
281 "R_XSTORMY16_GNU_VTINHERIT", /* name */
282 FALSE, /* partial_inplace */
283 0, /* src_mask */
284 0, /* dst_mask */
285 FALSE), /* pcrel_offset */
287 /* GNU extension to record C++ vtable member usage */
288 HOWTO (R_XSTORMY16_GNU_VTENTRY, /* type */
289 0, /* rightshift */
290 2, /* size (0 = byte, 1 = short, 2 = long) */
291 0, /* bitsize */
292 FALSE, /* pc_relative */
293 0, /* bitpos */
294 complain_overflow_dont, /* complain_on_overflow */
295 _bfd_elf_rel_vtable_reloc_fn, /* special_function */
296 "R_XSTORMY16_GNU_VTENTRY", /* name */
297 FALSE, /* partial_inplace */
298 0, /* src_mask */
299 0, /* dst_mask */
300 FALSE), /* pcrel_offset */
304 /* Map BFD reloc types to XSTORMY16 ELF reloc types. */
306 typedef struct xstormy16_reloc_map
308 bfd_reloc_code_real_type bfd_reloc_val;
309 unsigned int xstormy16_reloc_val;
310 reloc_howto_type * table;
311 } reloc_map;
313 static const reloc_map xstormy16_reloc_map [] =
315 { BFD_RELOC_NONE, R_XSTORMY16_NONE, xstormy16_elf_howto_table },
316 { BFD_RELOC_32, R_XSTORMY16_32, xstormy16_elf_howto_table },
317 { BFD_RELOC_16, R_XSTORMY16_16, xstormy16_elf_howto_table },
318 { BFD_RELOC_8, R_XSTORMY16_8, xstormy16_elf_howto_table },
319 { BFD_RELOC_32_PCREL, R_XSTORMY16_PC32, xstormy16_elf_howto_table },
320 { BFD_RELOC_16_PCREL, R_XSTORMY16_PC16, xstormy16_elf_howto_table },
321 { BFD_RELOC_8_PCREL, R_XSTORMY16_PC8, xstormy16_elf_howto_table },
322 { BFD_RELOC_XSTORMY16_REL_12, R_XSTORMY16_REL_12, xstormy16_elf_howto_table },
323 { BFD_RELOC_XSTORMY16_24, R_XSTORMY16_24, xstormy16_elf_howto_table },
324 { BFD_RELOC_XSTORMY16_FPTR16, R_XSTORMY16_FPTR16, xstormy16_elf_howto_table },
325 { BFD_RELOC_LO16, R_XSTORMY16_LO16, xstormy16_elf_howto_table },
326 { BFD_RELOC_HI16, R_XSTORMY16_HI16, xstormy16_elf_howto_table },
327 { BFD_RELOC_XSTORMY16_12, R_XSTORMY16_12, xstormy16_elf_howto_table },
328 { BFD_RELOC_VTABLE_INHERIT, R_XSTORMY16_GNU_VTINHERIT, xstormy16_elf_howto_table2 },
329 { BFD_RELOC_VTABLE_ENTRY, R_XSTORMY16_GNU_VTENTRY, xstormy16_elf_howto_table2 },
332 static reloc_howto_type *
333 xstormy16_reloc_type_lookup (bfd * abfd ATTRIBUTE_UNUSED,
334 bfd_reloc_code_real_type code)
336 unsigned int i;
338 for (i = ARRAY_SIZE (xstormy16_reloc_map); --i;)
340 const reloc_map * entry;
342 entry = xstormy16_reloc_map + i;
344 if (entry->bfd_reloc_val == code)
345 return entry->table + (entry->xstormy16_reloc_val
346 - entry->table[0].type);
349 return NULL;
352 static reloc_howto_type *
353 xstormy16_reloc_name_lookup (bfd *abfd ATTRIBUTE_UNUSED,
354 const char *r_name)
356 unsigned int i;
358 for (i = 0;
359 i < (sizeof (xstormy16_elf_howto_table)
360 / sizeof (xstormy16_elf_howto_table[0]));
361 i++)
362 if (xstormy16_elf_howto_table[i].name != NULL
363 && strcasecmp (xstormy16_elf_howto_table[i].name, r_name) == 0)
364 return &xstormy16_elf_howto_table[i];
366 for (i = 0;
367 i < (sizeof (xstormy16_elf_howto_table2)
368 / sizeof (xstormy16_elf_howto_table2[0]));
369 i++)
370 if (xstormy16_elf_howto_table2[i].name != NULL
371 && strcasecmp (xstormy16_elf_howto_table2[i].name, r_name) == 0)
372 return &xstormy16_elf_howto_table2[i];
374 return NULL;
377 /* Set the howto pointer for an XSTORMY16 ELF reloc. */
379 static void
380 xstormy16_info_to_howto_rela (bfd * abfd ATTRIBUTE_UNUSED,
381 arelent * cache_ptr,
382 Elf_Internal_Rela * dst)
384 unsigned int r_type = ELF32_R_TYPE (dst->r_info);
386 if (r_type <= (unsigned int) R_XSTORMY16_12)
387 cache_ptr->howto = &xstormy16_elf_howto_table [r_type];
388 else if (r_type - R_XSTORMY16_GNU_VTINHERIT
389 <= (unsigned int) R_XSTORMY16_GNU_VTENTRY)
390 cache_ptr->howto
391 = &xstormy16_elf_howto_table2 [r_type - R_XSTORMY16_GNU_VTINHERIT];
392 else
393 abort ();
396 /* We support 16-bit pointers to code above 64k by generating a thunk
397 below 64k containing a JMPF instruction to the final address. We
398 cannot, unfortunately, minimize the number of thunks unless the
399 -relax switch is given, as otherwise we have no idea where the
400 sections will fall in the address space. */
402 static bfd_boolean
403 xstormy16_elf_check_relocs (bfd *abfd,
404 struct bfd_link_info *info,
405 asection *sec,
406 const Elf_Internal_Rela *relocs)
408 const Elf_Internal_Rela *rel, *relend;
409 struct elf_link_hash_entry **sym_hashes;
410 Elf_Internal_Shdr *symtab_hdr;
411 bfd_vma *local_plt_offsets;
412 asection *splt;
413 bfd *dynobj;
415 if (info->relocatable)
416 return TRUE;
418 symtab_hdr = &elf_tdata(abfd)->symtab_hdr;
419 sym_hashes = elf_sym_hashes (abfd);
420 local_plt_offsets = elf_local_got_offsets (abfd);
421 splt = NULL;
422 dynobj = elf_hash_table(info)->dynobj;
424 relend = relocs + sec->reloc_count;
425 for (rel = relocs; rel < relend; ++rel)
427 unsigned long r_symndx;
428 struct elf_link_hash_entry *h;
429 bfd_vma *offset;
431 r_symndx = ELF32_R_SYM (rel->r_info);
432 if (r_symndx < symtab_hdr->sh_info)
433 h = NULL;
434 else
436 h = sym_hashes[r_symndx - symtab_hdr->sh_info];
437 while (h->root.type == bfd_link_hash_indirect
438 || h->root.type == bfd_link_hash_warning)
439 h = (struct elf_link_hash_entry *) h->root.u.i.link;
442 switch (ELF32_R_TYPE (rel->r_info))
444 /* This relocation describes a 16-bit pointer to a function.
445 We may need to allocate a thunk in low memory; reserve memory
446 for it now. */
447 case R_XSTORMY16_FPTR16:
448 if (rel->r_addend != 0)
450 (*info->callbacks->warning)
451 (info, _("non-zero addend in @fptr reloc"), 0,
452 abfd, 0, 0);
455 if (dynobj == NULL)
456 elf_hash_table (info)->dynobj = dynobj = abfd;
457 if (splt == NULL)
459 splt = bfd_get_section_by_name (dynobj, ".plt");
460 if (splt == NULL)
462 splt = bfd_make_section_with_flags (dynobj, ".plt",
463 (SEC_ALLOC
464 | SEC_LOAD
465 | SEC_HAS_CONTENTS
466 | SEC_IN_MEMORY
467 | SEC_LINKER_CREATED
468 | SEC_READONLY
469 | SEC_CODE));
471 if (splt == NULL
472 || ! bfd_set_section_alignment (dynobj, splt, 1))
473 return FALSE;
477 if (h != NULL)
478 offset = &h->plt.offset;
479 else
481 if (local_plt_offsets == NULL)
483 size_t size;
484 unsigned int i;
486 size = symtab_hdr->sh_info * sizeof (bfd_vma);
487 local_plt_offsets = bfd_alloc (abfd, size);
488 if (local_plt_offsets == NULL)
489 return FALSE;
490 elf_local_got_offsets (abfd) = local_plt_offsets;
492 for (i = 0; i < symtab_hdr->sh_info; i++)
493 local_plt_offsets[i] = (bfd_vma) -1;
495 offset = &local_plt_offsets[r_symndx];
498 if (*offset == (bfd_vma) -1)
500 *offset = splt->size;
501 splt->size += 4;
503 break;
505 /* This relocation describes the C++ object vtable hierarchy.
506 Reconstruct it for later use during GC. */
507 case R_XSTORMY16_GNU_VTINHERIT:
508 if (!bfd_elf_gc_record_vtinherit (abfd, sec, h, rel->r_offset))
509 return FALSE;
510 break;
512 /* This relocation describes which C++ vtable entries are actually
513 used. Record for later use during GC. */
514 case R_XSTORMY16_GNU_VTENTRY:
515 BFD_ASSERT (h != NULL);
516 if (h != NULL
517 && !bfd_elf_gc_record_vtentry (abfd, sec, h, rel->r_addend))
518 return FALSE;
519 break;
523 return TRUE;
526 /* A subroutine of xstormy16_elf_relax_section. If the global symbol H
527 is within the low 64k, remove any entry for it in the plt. */
529 struct relax_plt_data
531 asection *splt;
532 bfd_boolean *again;
535 static bfd_boolean
536 xstormy16_relax_plt_check (struct elf_link_hash_entry *h, void * xdata)
538 struct relax_plt_data *data = (struct relax_plt_data *) xdata;
540 if (h->plt.offset != (bfd_vma) -1)
542 bfd_vma address;
544 if (h->root.type == bfd_link_hash_undefined
545 || h->root.type == bfd_link_hash_undefweak)
546 address = 0;
547 else
548 address = (h->root.u.def.section->output_section->vma
549 + h->root.u.def.section->output_offset
550 + h->root.u.def.value);
552 if (address <= 0xffff)
554 h->plt.offset = -1;
555 data->splt->size -= 4;
556 *data->again = TRUE;
560 return TRUE;
563 /* A subroutine of xstormy16_elf_relax_section. If the global symbol H
564 previously had a plt entry, give it a new entry offset. */
566 static bfd_boolean
567 xstormy16_relax_plt_realloc (struct elf_link_hash_entry *h, void * xdata)
569 bfd_vma *entry = (bfd_vma *) xdata;
571 if (h->plt.offset != (bfd_vma) -1)
573 h->plt.offset = *entry;
574 *entry += 4;
577 return TRUE;
580 static bfd_boolean
581 xstormy16_elf_relax_section (bfd *dynobj,
582 asection *splt,
583 struct bfd_link_info *info,
584 bfd_boolean *again)
586 struct relax_plt_data relax_plt_data;
587 bfd *ibfd;
589 /* Assume nothing changes. */
590 *again = FALSE;
592 if (info->relocatable)
593 return TRUE;
595 /* We only relax the .plt section at the moment. */
596 if (dynobj != elf_hash_table (info)->dynobj
597 || strcmp (splt->name, ".plt") != 0)
598 return TRUE;
600 /* Quick check for an empty plt. */
601 if (splt->size == 0)
602 return TRUE;
604 /* Map across all global symbols; see which ones happen to
605 fall in the low 64k. */
606 relax_plt_data.splt = splt;
607 relax_plt_data.again = again;
608 elf_link_hash_traverse (elf_hash_table (info), xstormy16_relax_plt_check,
609 &relax_plt_data);
611 /* Likewise for local symbols, though that's somewhat less convenient
612 as we have to walk the list of input bfds and swap in symbol data. */
613 for (ibfd = info->input_bfds; ibfd ; ibfd = ibfd->link_next)
615 bfd_vma *local_plt_offsets = elf_local_got_offsets (ibfd);
616 Elf_Internal_Shdr *symtab_hdr;
617 Elf_Internal_Sym *isymbuf = NULL;
618 unsigned int idx;
620 if (! local_plt_offsets)
621 continue;
623 symtab_hdr = &elf_tdata (ibfd)->symtab_hdr;
624 if (symtab_hdr->sh_info != 0)
626 isymbuf = (Elf_Internal_Sym *) symtab_hdr->contents;
627 if (isymbuf == NULL)
628 isymbuf = bfd_elf_get_elf_syms (ibfd, symtab_hdr,
629 symtab_hdr->sh_info, 0,
630 NULL, NULL, NULL);
631 if (isymbuf == NULL)
632 return FALSE;
635 for (idx = 0; idx < symtab_hdr->sh_info; ++idx)
637 Elf_Internal_Sym *isym;
638 asection *tsec;
639 bfd_vma address;
641 if (local_plt_offsets[idx] == (bfd_vma) -1)
642 continue;
644 isym = &isymbuf[idx];
645 if (isym->st_shndx == SHN_UNDEF)
646 continue;
647 else if (isym->st_shndx == SHN_ABS)
648 tsec = bfd_abs_section_ptr;
649 else if (isym->st_shndx == SHN_COMMON)
650 tsec = bfd_com_section_ptr;
651 else
652 tsec = bfd_section_from_elf_index (ibfd, isym->st_shndx);
654 address = (tsec->output_section->vma
655 + tsec->output_offset
656 + isym->st_value);
657 if (address <= 0xffff)
659 local_plt_offsets[idx] = -1;
660 splt->size -= 4;
661 *again = TRUE;
665 if (isymbuf != NULL
666 && symtab_hdr->contents != (unsigned char *) isymbuf)
668 if (! info->keep_memory)
669 free (isymbuf);
670 else
672 /* Cache the symbols for elf_link_input_bfd. */
673 symtab_hdr->contents = (unsigned char *) isymbuf;
678 /* If we changed anything, walk the symbols again to reallocate
679 .plt entry addresses. */
680 if (*again && splt->size > 0)
682 bfd_vma entry = 0;
684 elf_link_hash_traverse (elf_hash_table (info),
685 xstormy16_relax_plt_realloc, &entry);
687 for (ibfd = info->input_bfds; ibfd ; ibfd = ibfd->link_next)
689 bfd_vma *local_plt_offsets = elf_local_got_offsets (ibfd);
690 unsigned int nlocals = elf_tdata (ibfd)->symtab_hdr.sh_info;
691 unsigned int idx;
693 if (! local_plt_offsets)
694 continue;
696 for (idx = 0; idx < nlocals; ++idx)
697 if (local_plt_offsets[idx] != (bfd_vma) -1)
699 local_plt_offsets[idx] = entry;
700 entry += 4;
705 return TRUE;
708 static bfd_boolean
709 xstormy16_elf_always_size_sections (bfd *output_bfd ATTRIBUTE_UNUSED,
710 struct bfd_link_info *info)
712 bfd *dynobj;
713 asection *splt;
715 if (info->relocatable)
716 return TRUE;
718 dynobj = elf_hash_table (info)->dynobj;
719 if (dynobj == NULL)
720 return TRUE;
722 splt = bfd_get_section_by_name (dynobj, ".plt");
723 BFD_ASSERT (splt != NULL);
725 splt->contents = bfd_zalloc (dynobj, splt->size);
726 if (splt->contents == NULL)
727 return FALSE;
729 return TRUE;
732 /* Relocate an XSTORMY16 ELF section.
734 The RELOCATE_SECTION function is called by the new ELF backend linker
735 to handle the relocations for a section.
737 The relocs are always passed as Rela structures; if the section
738 actually uses Rel structures, the r_addend field will always be
739 zero.
741 This function is responsible for adjusting the section contents as
742 necessary, and (if using Rela relocs and generating a relocatable
743 output file) adjusting the reloc addend as necessary.
745 This function does not have to worry about setting the reloc
746 address or the reloc symbol index.
748 LOCAL_SYMS is a pointer to the swapped in local symbols.
750 LOCAL_SECTIONS is an array giving the section in the input file
751 corresponding to the st_shndx field of each local symbol.
753 The global hash table entry for the global symbols can be found
754 via elf_sym_hashes (input_bfd).
756 When generating relocatable output, this function must handle
757 STB_LOCAL/STT_SECTION symbols specially. The output symbol is
758 going to be the section symbol corresponding to the output
759 section, which means that the addend must be adjusted
760 accordingly. */
762 static bfd_boolean
763 xstormy16_elf_relocate_section (bfd * output_bfd ATTRIBUTE_UNUSED,
764 struct bfd_link_info * info,
765 bfd * input_bfd,
766 asection * input_section,
767 bfd_byte * contents,
768 Elf_Internal_Rela * relocs,
769 Elf_Internal_Sym * local_syms,
770 asection ** local_sections)
772 Elf_Internal_Shdr * symtab_hdr;
773 struct elf_link_hash_entry ** sym_hashes;
774 Elf_Internal_Rela * rel;
775 Elf_Internal_Rela * relend;
776 bfd *dynobj;
777 asection *splt;
779 symtab_hdr = & elf_tdata (input_bfd)->symtab_hdr;
780 sym_hashes = elf_sym_hashes (input_bfd);
781 relend = relocs + input_section->reloc_count;
783 dynobj = elf_hash_table (info)->dynobj;
784 splt = NULL;
785 if (dynobj != NULL)
786 splt = bfd_get_section_by_name (dynobj, ".plt");
788 for (rel = relocs; rel < relend; rel ++)
790 reloc_howto_type * howto;
791 unsigned long r_symndx;
792 Elf_Internal_Sym * sym;
793 asection * sec;
794 struct elf_link_hash_entry * h;
795 bfd_vma relocation;
796 bfd_reloc_status_type r;
797 const char * name = NULL;
798 int r_type;
800 r_type = ELF32_R_TYPE (rel->r_info);
802 if ( r_type == R_XSTORMY16_GNU_VTINHERIT
803 || r_type == R_XSTORMY16_GNU_VTENTRY)
804 continue;
806 r_symndx = ELF32_R_SYM (rel->r_info);
807 howto = xstormy16_elf_howto_table + ELF32_R_TYPE (rel->r_info);
808 h = NULL;
809 sym = NULL;
810 sec = NULL;
812 if (r_symndx < symtab_hdr->sh_info)
814 sym = local_syms + r_symndx;
815 sec = local_sections [r_symndx];
816 relocation = _bfd_elf_rela_local_sym (output_bfd, sym, &sec, rel);
818 else
820 bfd_boolean unresolved_reloc, warned;
822 RELOC_FOR_GLOBAL_SYMBOL (info, input_bfd, input_section, rel,
823 r_symndx, symtab_hdr, sym_hashes,
824 h, sec, relocation,
825 unresolved_reloc, warned);
828 if (sec != NULL && elf_discarded_section (sec))
829 RELOC_AGAINST_DISCARDED_SECTION (info, input_bfd, input_section,
830 rel, relend, howto, contents);
832 if (info->relocatable)
833 continue;
835 if (h != NULL)
836 name = h->root.root.string;
837 else
839 name = (bfd_elf_string_from_elf_section
840 (input_bfd, symtab_hdr->sh_link, sym->st_name));
841 if (name == NULL || *name == '\0')
842 name = bfd_section_name (input_bfd, sec);
845 switch (ELF32_R_TYPE (rel->r_info))
847 case R_XSTORMY16_24:
849 bfd_vma reloc = relocation + rel->r_addend;
850 unsigned int x;
852 x = bfd_get_32 (input_bfd, contents + rel->r_offset);
853 x &= 0x0000ff00;
854 x |= reloc & 0xff;
855 x |= (reloc << 8) & 0xffff0000;
856 bfd_put_32 (input_bfd, x, contents + rel->r_offset);
858 if (reloc & ~0xffffff)
859 r = bfd_reloc_overflow;
860 else
861 r = bfd_reloc_ok;
862 break;
865 case R_XSTORMY16_FPTR16:
867 bfd_vma *plt_offset;
869 if (h != NULL)
870 plt_offset = &h->plt.offset;
871 else
872 plt_offset = elf_local_got_offsets (input_bfd) + r_symndx;
874 if (relocation <= 0xffff)
876 /* If the symbol is in range for a 16-bit address, we should
877 have deallocated the plt entry in relax_section. */
878 BFD_ASSERT (*plt_offset == (bfd_vma) -1);
880 else
882 /* If the symbol is out of range for a 16-bit address,
883 we must have allocated a plt entry. */
884 BFD_ASSERT (*plt_offset != (bfd_vma) -1);
886 /* If this is the first time we've processed this symbol,
887 fill in the plt entry with the correct symbol address. */
888 if ((*plt_offset & 1) == 0)
890 unsigned int x;
892 x = 0x00000200; /* jmpf */
893 x |= relocation & 0xff;
894 x |= (relocation << 8) & 0xffff0000;
895 bfd_put_32 (input_bfd, x, splt->contents + *plt_offset);
896 *plt_offset |= 1;
899 relocation = (splt->output_section->vma
900 + splt->output_offset
901 + (*plt_offset & -2));
903 r = _bfd_final_link_relocate (howto, input_bfd, input_section,
904 contents, rel->r_offset,
905 relocation, 0);
906 break;
909 default:
910 r = _bfd_final_link_relocate (howto, input_bfd, input_section,
911 contents, rel->r_offset,
912 relocation, rel->r_addend);
913 break;
916 if (r != bfd_reloc_ok)
918 const char * msg = NULL;
920 switch (r)
922 case bfd_reloc_overflow:
923 r = info->callbacks->reloc_overflow
924 (info, (h ? &h->root : NULL), name, howto->name,
925 (bfd_vma) 0, input_bfd, input_section, rel->r_offset);
926 break;
928 case bfd_reloc_undefined:
929 r = info->callbacks->undefined_symbol
930 (info, name, input_bfd, input_section, rel->r_offset,
931 TRUE);
932 break;
934 case bfd_reloc_outofrange:
935 msg = _("internal error: out of range error");
936 break;
938 case bfd_reloc_notsupported:
939 msg = _("internal error: unsupported relocation error");
940 break;
942 case bfd_reloc_dangerous:
943 msg = _("internal error: dangerous relocation");
944 break;
946 default:
947 msg = _("internal error: unknown error");
948 break;
951 if (msg)
952 r = info->callbacks->warning
953 (info, msg, name, input_bfd, input_section, rel->r_offset);
955 if (! r)
956 return FALSE;
960 return TRUE;
963 /* This must exist if dynobj is ever set. */
965 static bfd_boolean
966 xstormy16_elf_finish_dynamic_sections (bfd *abfd ATTRIBUTE_UNUSED,
967 struct bfd_link_info *info)
969 bfd *dynobj;
970 asection *splt;
972 /* As an extra sanity check, verify that all plt entries have
973 been filled in. */
975 if ((dynobj = elf_hash_table (info)->dynobj) != NULL
976 && (splt = bfd_get_section_by_name (dynobj, ".plt")) != NULL)
978 bfd_byte *contents = splt->contents;
979 unsigned int i, size = splt->size;
981 for (i = 0; i < size; i += 4)
983 unsigned int x = bfd_get_32 (dynobj, contents + i);
985 BFD_ASSERT (x != 0);
989 return TRUE;
992 /* Return the section that should be marked against GC for a given
993 relocation. */
995 static asection *
996 xstormy16_elf_gc_mark_hook (asection *sec,
997 struct bfd_link_info *info,
998 Elf_Internal_Rela *rel,
999 struct elf_link_hash_entry *h,
1000 Elf_Internal_Sym *sym)
1002 if (h != NULL)
1003 switch (ELF32_R_TYPE (rel->r_info))
1005 case R_XSTORMY16_GNU_VTINHERIT:
1006 case R_XSTORMY16_GNU_VTENTRY:
1007 return NULL;
1010 return _bfd_elf_gc_mark_hook (sec, info, rel, h, sym);
1013 #define ELF_ARCH bfd_arch_xstormy16
1014 #define ELF_MACHINE_CODE EM_XSTORMY16
1015 #define ELF_MAXPAGESIZE 0x100
1017 #define TARGET_LITTLE_SYM bfd_elf32_xstormy16_vec
1018 #define TARGET_LITTLE_NAME "elf32-xstormy16"
1020 #define elf_info_to_howto_rel NULL
1021 #define elf_info_to_howto xstormy16_info_to_howto_rela
1022 #define elf_backend_relocate_section xstormy16_elf_relocate_section
1023 #define elf_backend_gc_mark_hook xstormy16_elf_gc_mark_hook
1024 #define elf_backend_check_relocs xstormy16_elf_check_relocs
1025 #define elf_backend_always_size_sections \
1026 xstormy16_elf_always_size_sections
1027 #define elf_backend_omit_section_dynsym \
1028 ((bfd_boolean (*) (bfd *, struct bfd_link_info *, asection *)) bfd_true)
1029 #define elf_backend_finish_dynamic_sections \
1030 xstormy16_elf_finish_dynamic_sections
1032 #define elf_backend_can_gc_sections 1
1033 #define elf_backend_rela_normal 1
1035 #define bfd_elf32_bfd_reloc_type_lookup xstormy16_reloc_type_lookup
1036 #define bfd_elf32_bfd_reloc_name_lookup \
1037 xstormy16_reloc_name_lookup
1038 #define bfd_elf32_bfd_relax_section xstormy16_elf_relax_section
1040 #include "elf32-target.h"