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2004-11-03 Randolph Chung <tausq@debian.org>
[deliverable/binutils-gdb.git] / bfd / elf32-xstormy16.c
CommitLineData
93fbbb04 1/* XSTORMY16-specific support for 32-bit ELF.
b2a8e766 2 Copyright 2000, 2001, 2002, 2003, 2004 Free Software Foundation, Inc.
93fbbb04
GK		 3
4This file is part of BFD, the Binary File Descriptor library.
5
6This program is free software; you can redistribute it and/or modify
7it under the terms of the GNU General Public License as published by
8the Free Software Foundation; either version 2 of the License, or
9(at your option) any later version.
10
11This program is distributed in the hope that it will be useful,
12but WITHOUT ANY WARRANTY; without even the implied warranty of
13MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
14GNU General Public License for more details.
15
16You should have received a copy of the GNU General Public License
17along with this program; if not, write to the Free Software
18Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA. */
19
20#include "bfd.h"
21#include "sysdep.h"
22#include "libbfd.h"
23#include "elf-bfd.h"
24#include "elf/xstormy16.h"
1f7fd478 25#include "libiberty.h"
93fbbb04
GK		 26
27/* Forward declarations. */
28static reloc_howto_type * xstormy16_reloc_type_lookup
29 PARAMS ((bfd *abfd, bfd_reloc_code_real_type code));
cedb70c5 30static void xstormy16_info_to_howto_rela
947216bf 31 PARAMS ((bfd *, arelent *, Elf_Internal_Rela *));
cedb70c5 32static bfd_reloc_status_type xstormy16_elf_24_reloc
93fbbb04
GK		 33 PARAMS ((bfd *abfd, arelent *reloc_entry, asymbol *symbol,
34 PTR data, asection *input_section, bfd *output_bfd,
35 char **error_message));
b34976b6 36static bfd_boolean xstormy16_elf_check_relocs
93fbbb04
GK		 37 PARAMS ((bfd *, struct bfd_link_info *, asection *,
38 const Elf_Internal_Rela *));
b34976b6 39static bfd_boolean xstormy16_relax_plt_check
93fbbb04 40 PARAMS ((struct elf_link_hash_entry *, PTR));
b34976b6 41static bfd_boolean xstormy16_relax_plt_realloc
93fbbb04 42 PARAMS ((struct elf_link_hash_entry *, PTR));
b34976b6 43static bfd_boolean xstormy16_elf_relax_section
93fbbb04 44 PARAMS ((bfd *abfd, asection *sec, struct bfd_link_info *link_info,
b34976b6
AM		 45 bfd_boolean *again));
46static bfd_boolean xstormy16_elf_always_size_sections
93fbbb04 47 PARAMS ((bfd *, struct bfd_link_info *));
b34976b6 48static bfd_boolean xstormy16_elf_relocate_section
93fbbb04
GK		 49 PARAMS ((bfd *, struct bfd_link_info *, bfd *, asection *, bfd_byte *,
50 Elf_Internal_Rela *, Elf_Internal_Sym *, asection **));
b34976b6 51static bfd_boolean xstormy16_elf_finish_dynamic_sections
93fbbb04 52 PARAMS((bfd *, struct bfd_link_info *));
b34976b6 53static bfd_boolean xstormy16_elf_gc_sweep_hook
93fbbb04
GK		 54 PARAMS ((bfd *, struct bfd_link_info *, asection *,
55 const Elf_Internal_Rela *));
56static asection * xstormy16_elf_gc_mark_hook
1e2f5b6e 57 PARAMS ((asection *, struct bfd_link_info *, Elf_Internal_Rela *,
93fbbb04
GK		 58 struct elf_link_hash_entry *, Elf_Internal_Sym *));
59
60static reloc_howto_type xstormy16_elf_howto_table [] =
61{
62 /* This reloc does nothing. */
63 HOWTO (R_XSTORMY16_NONE, /* type */
64 0, /* rightshift */
65 2, /* size (0 = byte, 1 = short, 2 = long) */
66 32, /* bitsize */
b34976b6 67 FALSE, /* pc_relative */
93fbbb04
GK		 68 0, /* bitpos */
69 complain_overflow_bitfield, /* complain_on_overflow */
70 bfd_elf_generic_reloc, /* special_function */
71 "R_XSTORMY16_NONE", /* name */
b34976b6 72 FALSE, /* partial_inplace */
93fbbb04
GK		 73 0, /* src_mask */
74 0, /* dst_mask */
b34976b6 75 FALSE), /* pcrel_offset */
93fbbb04
GK		 76
77 /* A 32 bit absolute relocation. */
78 HOWTO (R_XSTORMY16_32, /* type */
79 0, /* rightshift */
80 2, /* size (0 = byte, 1 = short, 2 = long) */
81 32, /* bitsize */
b34976b6 82 FALSE, /* pc_relative */
93fbbb04
GK		 83 0, /* bitpos */
84 complain_overflow_dont, /* complain_on_overflow */
85 bfd_elf_generic_reloc, /* special_function */
86 "R_XSTORMY16_32", /* name */
b34976b6 87 FALSE, /* partial_inplace */
93fbbb04
GK		 88 0, /* src_mask */
89 0xffffffff, /* dst_mask */
b34976b6 90 FALSE), /* pcrel_offset */
cedb70c5 91
93fbbb04
GK		 92 /* A 16 bit absolute relocation. */
93 HOWTO (R_XSTORMY16_16, /* type */
94 0, /* rightshift */
95 1, /* size (0 = byte, 1 = short, 2 = long) */
96 16, /* bitsize */
b34976b6 97 FALSE, /* pc_relative */
93fbbb04 98 0, /* bitpos */
0afb2dc0 99 complain_overflow_bitfield, /* complain_on_overflow */
93fbbb04
GK		 100 bfd_elf_generic_reloc, /* special_function */
101 "R_XSTORMY16_16", /* name */
b34976b6 102 FALSE, /* partial_inplace */
93fbbb04 103 0, /* src_mask */
4d2e1ff0 104 0xffff, /* dst_mask */
b34976b6 105 FALSE), /* pcrel_offset */
cedb70c5 106
93fbbb04 107 /* An 8 bit absolute relocation. */
4d2e1ff0 108 HOWTO (R_XSTORMY16_8, /* type */
93fbbb04
GK		 109 0, /* rightshift */
110 0, /* size (0 = byte, 1 = short, 2 = long) */
111 8, /* bitsize */
b34976b6 112 FALSE, /* pc_relative */
93fbbb04 113 0, /* bitpos */
4d2e1ff0 114 complain_overflow_unsigned, /* complain_on_overflow */
93fbbb04
GK		 115 bfd_elf_generic_reloc, /* special_function */
116 "R_XSTORMY16_8", /* name */
b34976b6 117 FALSE, /* partial_inplace */
93fbbb04 118 0, /* src_mask */
4d2e1ff0 119 0xff, /* dst_mask */
b34976b6 120 FALSE), /* pcrel_offset */
cedb70c5 121
93fbbb04
GK		 122 /* A 32 bit pc-relative relocation. */
123 HOWTO (R_XSTORMY16_PC32, /* type */
124 0, /* rightshift */
125 2, /* size (0 = byte, 1 = short, 2 = long) */
126 32, /* bitsize */
b34976b6 127 TRUE, /* pc_relative */
93fbbb04
GK		 128 0, /* bitpos */
129 complain_overflow_dont, /* complain_on_overflow */
130 bfd_elf_generic_reloc, /* special_function */
131 "R_XSTORMY16_PC32", /* name */
b34976b6 132 FALSE, /* partial_inplace */
93fbbb04
GK		 133 0, /* src_mask */
134 0xffffffff, /* dst_mask */
b34976b6 135 TRUE), /* pcrel_offset */
cedb70c5 136
93fbbb04
GK		 137 /* A 16 bit pc-relative relocation. */
138 HOWTO (R_XSTORMY16_PC16, /* type */
139 0, /* rightshift */
140 1, /* size (0 = byte, 1 = short, 2 = long) */
141 16, /* bitsize */
b34976b6 142 TRUE, /* pc_relative */
93fbbb04
GK		 143 0, /* bitpos */
144 complain_overflow_signed, /* complain_on_overflow */
145 bfd_elf_generic_reloc, /* special_function */
146 "R_XSTORMY16_PC16", /* name */
b34976b6 147 FALSE, /* partial_inplace */
93fbbb04
GK		 148 0, /* src_mask */
149 0xffffffff, /* dst_mask */
b34976b6 150 TRUE), /* pcrel_offset */
cedb70c5 151
93fbbb04
GK		 152 /* An 8 bit pc-relative relocation. */
153 HOWTO (R_XSTORMY16_PC8, /* type */
154 0, /* rightshift */
155 0, /* size (0 = byte, 1 = short, 2 = long) */
156 8, /* bitsize */
b34976b6 157 TRUE, /* pc_relative */
93fbbb04
GK		 158 0, /* bitpos */
159 complain_overflow_signed, /* complain_on_overflow */
160 bfd_elf_generic_reloc, /* special_function */
161 "R_XSTORMY16_PC8", /* name */
b34976b6 162 FALSE, /* partial_inplace */
93fbbb04
GK		 163 0, /* src_mask */
164 0xffffffff, /* dst_mask */
b34976b6 165 TRUE), /* pcrel_offset */
cedb70c5 166
93fbbb04
GK		 167 /* A 12-bit pc-relative relocation suitable for the branch instructions. */
168 HOWTO (R_XSTORMY16_REL_12, /* type */
169 1, /* rightshift */
170 1, /* size (0 = byte, 1 = short, 2 = long) */
171 11, /* bitsize */
b34976b6 172 TRUE, /* pc_relative */
93fbbb04
GK		 173 1, /* bitpos */
174 complain_overflow_signed, /* complain_on_overflow */
175 bfd_elf_generic_reloc, /* special_function */
176 "R_XSTORMY16_REL_12", /* name */
5c9e189c 177 FALSE, /* partial_inplace */
93fbbb04 178 0, /* src_mask */
60e42408 179 0x0ffe, /* dst_mask */
b34976b6 180 TRUE), /* pcrel_offset */
cedb70c5 181
93fbbb04
GK		 182 /* A 24-bit absolute relocation suitable for the jump instructions. */
183 HOWTO (R_XSTORMY16_24, /* type */
184 0, /* rightshift */
185 2, /* size (0 = byte, 1 = short, 2 = long) */
186 24, /* bitsize */
b34976b6 187 FALSE, /* pc_relative */
93fbbb04
GK		 188 0, /* bitpos */
189 complain_overflow_unsigned, /* complain_on_overflow */
190 xstormy16_elf_24_reloc, /* special_function */
191 "R_XSTORMY16_24", /* name */
b34976b6 192 TRUE, /* partial_inplace */
93fbbb04
GK		 193 0, /* src_mask */
194 0xffff00ff, /* dst_mask */
b34976b6 195 TRUE), /* pcrel_offset */
cedb70c5 196
93fbbb04
GK		 197 /* A 16 bit absolute relocation to a function pointer. */
198 HOWTO (R_XSTORMY16_FPTR16, /* type */
199 0, /* rightshift */
200 1, /* size (0 = byte, 1 = short, 2 = long) */
201 16, /* bitsize */
b34976b6 202 FALSE, /* pc_relative */
93fbbb04
GK		 203 0, /* bitpos */
204 complain_overflow_bitfield, /* complain_on_overflow */
205 bfd_elf_generic_reloc, /* special_function */
206 "R_XSTORMY16_FPTR16", /* name */
b34976b6 207 FALSE, /* partial_inplace */
93fbbb04
GK		 208 0, /* src_mask */
209 0xffffffff, /* dst_mask */
b34976b6 210 FALSE), /* pcrel_offset */
46f2b541
DD		 211
212 /* Low order 16 bit value of a high memory address. */
213 HOWTO (R_XSTORMY16_LO16, /* type */
214 0, /* rightshift */
215 1, /* size (0 = byte, 1 = short, 2 = long) */
216 16, /* bitsize */
217 FALSE, /* pc_relative */
218 0, /* bitpos */
219 complain_overflow_dont, /* complain_on_overflow */
220 bfd_elf_generic_reloc, /* special_function */
221 "R_XSTORMY16_LO16", /* name */
222 FALSE, /* partial_inplace */
223 0, /* src_mask */
224 0xffff, /* dst_mask */
225 FALSE), /* pcrel_offset */
226
227 /* High order 16 bit value of a high memory address. */
228 HOWTO (R_XSTORMY16_HI16, /* type */
229 16, /* rightshift */
230 1, /* size (0 = byte, 1 = short, 2 = long) */
231 16, /* bitsize */
232 FALSE, /* pc_relative */
233 0, /* bitpos */
234 complain_overflow_dont, /* complain_on_overflow */
235 bfd_elf_generic_reloc, /* special_function */
236 "R_XSTORMY16_HI16", /* name */
237 FALSE, /* partial_inplace */
238 0, /* src_mask */
239 0xffff, /* dst_mask */
240 FALSE), /* pcrel_offset */
5fd63999
DD		 241
242 /* A 12 bit absolute relocation. */
243 HOWTO (R_XSTORMY16_12, /* type */
244 0, /* rightshift */
245 1, /* size (0 = byte, 1 = short, 2 = long) */
246 12, /* bitsize */
247 FALSE, /* pc_relative */
248 0, /* bitpos */
249 complain_overflow_signed, /* complain_on_overflow */
250 bfd_elf_generic_reloc, /* special_function */
251 "R_XSTORMY16_12", /* name */
252 FALSE, /* partial_inplace */
253 0x0000, /* src_mask */
254 0x0fff, /* dst_mask */
255 FALSE), /* pcrel_offset */
93fbbb04 256};
cedb70c5 257
93fbbb04
GK		 258static reloc_howto_type xstormy16_elf_howto_table2 [] =
259{
260 /* GNU extension to record C++ vtable hierarchy */
261 HOWTO (R_XSTORMY16_GNU_VTINHERIT, /* type */
262 0, /* rightshift */
263 2, /* size (0 = byte, 1 = short, 2 = long) */
264 0, /* bitsize */
b34976b6 265 FALSE, /* pc_relative */
93fbbb04
GK		 266 0, /* bitpos */
267 complain_overflow_dont, /* complain_on_overflow */
268 NULL, /* special_function */
269 "R_XSTORMY16_GNU_VTINHERIT", /* name */
b34976b6 270 FALSE, /* partial_inplace */
93fbbb04
GK		 271 0, /* src_mask */
272 0, /* dst_mask */
b34976b6 273 FALSE), /* pcrel_offset */
93fbbb04
GK		 274
275 /* GNU extension to record C++ vtable member usage */
276 HOWTO (R_XSTORMY16_GNU_VTENTRY, /* type */
277 0, /* rightshift */
278 2, /* size (0 = byte, 1 = short, 2 = long) */
279 0, /* bitsize */
b34976b6 280 FALSE, /* pc_relative */
93fbbb04
GK		 281 0, /* bitpos */
282 complain_overflow_dont, /* complain_on_overflow */
283 _bfd_elf_rel_vtable_reloc_fn, /* special_function */
284 "R_XSTORMY16_GNU_VTENTRY", /* name */
b34976b6 285 FALSE, /* partial_inplace */
93fbbb04
GK		 286 0, /* src_mask */
287 0, /* dst_mask */
b34976b6 288 FALSE), /* pcrel_offset */
cedb70c5 289
93fbbb04
GK		 290};
291\f
292/* Map BFD reloc types to XSTORMY16 ELF reloc types. */
293
1f7fd478 294typedef struct xstormy16_reloc_map
93fbbb04 295{
1f7fd478
NC		 296 bfd_reloc_code_real_type bfd_reloc_val;
297 unsigned int xstormy16_reloc_val;
298 reloc_howto_type * table;
299} reloc_map;
93fbbb04 300
1f7fd478 301static const reloc_map xstormy16_reloc_map [] =
93fbbb04 302{
1f7fd478
NC		 303 { BFD_RELOC_NONE, R_XSTORMY16_NONE, xstormy16_elf_howto_table },
304 { BFD_RELOC_32, R_XSTORMY16_32, xstormy16_elf_howto_table },
305 { BFD_RELOC_16, R_XSTORMY16_16, xstormy16_elf_howto_table },
306 { BFD_RELOC_8, R_XSTORMY16_8, xstormy16_elf_howto_table },
307 { BFD_RELOC_32_PCREL, R_XSTORMY16_PC32, xstormy16_elf_howto_table },
308 { BFD_RELOC_16_PCREL, R_XSTORMY16_PC16, xstormy16_elf_howto_table },
309 { BFD_RELOC_8_PCREL, R_XSTORMY16_PC8, xstormy16_elf_howto_table },
310 { BFD_RELOC_XSTORMY16_REL_12, R_XSTORMY16_REL_12, xstormy16_elf_howto_table },
311 { BFD_RELOC_XSTORMY16_24, R_XSTORMY16_24, xstormy16_elf_howto_table },
312 { BFD_RELOC_XSTORMY16_FPTR16, R_XSTORMY16_FPTR16, xstormy16_elf_howto_table },
46f2b541
DD		 313 { BFD_RELOC_LO16, R_XSTORMY16_LO16, xstormy16_elf_howto_table },
314 { BFD_RELOC_HI16, R_XSTORMY16_HI16, xstormy16_elf_howto_table },
5fd63999 315 { BFD_RELOC_XSTORMY16_12, R_XSTORMY16_12, xstormy16_elf_howto_table },
1f7fd478
NC		 316 { BFD_RELOC_VTABLE_INHERIT, R_XSTORMY16_GNU_VTINHERIT, xstormy16_elf_howto_table2 },
317 { BFD_RELOC_VTABLE_ENTRY, R_XSTORMY16_GNU_VTENTRY, xstormy16_elf_howto_table2 },
93fbbb04
GK		 318};
319
320static reloc_howto_type *
321xstormy16_reloc_type_lookup (abfd, code)
322 bfd * abfd ATTRIBUTE_UNUSED;
323 bfd_reloc_code_real_type code;
324{
325 unsigned int i;
326
1f7fd478
NC		 327 for (i = ARRAY_SIZE (xstormy16_reloc_map); --i;)
328 {
329 const reloc_map * entry;
330
331 entry = xstormy16_reloc_map + i;
332
333 if (entry->bfd_reloc_val == code)
334 return entry->table + (entry->xstormy16_reloc_val
335 - entry->table[0].type);
336 }
cedb70c5 337
93fbbb04
GK		 338 return NULL;
339}
340
341/* Set the howto pointer for an XSTORMY16 ELF reloc. */
342
343static void
344xstormy16_info_to_howto_rela (abfd, cache_ptr, dst)
345 bfd * abfd ATTRIBUTE_UNUSED;
346 arelent * cache_ptr;
947216bf 347 Elf_Internal_Rela * dst;
93fbbb04
GK		 348{
349 unsigned int r_type = ELF32_R_TYPE (dst->r_info);
350
5fd63999 351 if (r_type <= (unsigned int) R_XSTORMY16_12)
93fbbb04
GK		 352 cache_ptr->howto = &xstormy16_elf_howto_table [r_type];
353 else if (r_type - R_XSTORMY16_GNU_VTINHERIT
354 <= (unsigned int) R_XSTORMY16_GNU_VTENTRY)
355 cache_ptr->howto
356 = &xstormy16_elf_howto_table2 [r_type - R_XSTORMY16_GNU_VTINHERIT];
357 else
358 abort ();
359}
360
361/* Handle the R_XSTORMY16_24 reloc, which has an odd bit arrangement. */
362
363static bfd_reloc_status_type
364xstormy16_elf_24_reloc (abfd, reloc_entry, symbol, data, input_section,
365 output_bfd, error_message)
366 bfd *abfd;
367 arelent *reloc_entry;
368 asymbol *symbol;
369 PTR data;
370 asection *input_section;
371 bfd *output_bfd;
372 char **error_message ATTRIBUTE_UNUSED;
373{
374 bfd_vma relocation, x;
375
376 if (output_bfd != NULL)
377 {
378 reloc_entry->address += input_section->output_offset;
379 return bfd_reloc_ok;
380 }
381
07515404 382 if (reloc_entry->address > bfd_get_section_limit (abfd, input_section))
93fbbb04
GK		 383 return bfd_reloc_outofrange;
384
385 if (bfd_is_com_section (symbol->section))
386 relocation = 0;
387 else
388 relocation = symbol->value;
389
390 relocation += symbol->section->output_section->vma;
391 relocation += symbol->section->output_offset;
392 relocation += reloc_entry->addend;
393
394 x = bfd_get_32 (abfd, (bfd_byte *) data + reloc_entry->address);
395 x &= 0x0000ff00;
396 x |= relocation & 0xff;
397 x |= (relocation << 8) & 0xffff0000;
398 bfd_put_32 (abfd, x, (bfd_byte *) data + reloc_entry->address);
399
400 if (relocation & ~ (bfd_vma) 0xffffff)
401 return bfd_reloc_overflow;
402
403 return bfd_reloc_ok;
404}
405\f
406/* We support 16-bit pointers to code above 64k by generating a thunk
407 below 64k containing a JMPF instruction to the final address. We
408 cannot, unfortunately, minimize the number of thunks unless the
409 -relax switch is given, as otherwise we have no idea where the
410 sections will fall in the address space. */
411
b34976b6 412static bfd_boolean
93fbbb04
GK		 413xstormy16_elf_check_relocs (abfd, info, sec, relocs)
414 bfd *abfd;
415 struct bfd_link_info *info;
416 asection *sec;
417 const Elf_Internal_Rela *relocs;
418{
419 const Elf_Internal_Rela *rel, *relend;
420 struct elf_link_hash_entry **sym_hashes;
421 Elf_Internal_Shdr *symtab_hdr;
422 bfd_vma *local_plt_offsets;
423 asection *splt;
424 bfd *dynobj;
425
1049f94e 426 if (info->relocatable)
b34976b6 427 return TRUE;
93fbbb04
GK		 428
429 symtab_hdr = &elf_tdata(abfd)->symtab_hdr;
430 sym_hashes = elf_sym_hashes (abfd);
431 local_plt_offsets = elf_local_got_offsets (abfd);
432 splt = NULL;
433 dynobj = elf_hash_table(info)->dynobj;
434
435 relend = relocs + sec->reloc_count;
436 for (rel = relocs; rel < relend; ++rel)
437 {
438 unsigned long r_symndx;
439 struct elf_link_hash_entry *h;
440 bfd_vma *offset;
441
442 r_symndx = ELF32_R_SYM (rel->r_info);
443 if (r_symndx < symtab_hdr->sh_info)
444 h = NULL;
445 else
446 {
447 h = sym_hashes[r_symndx - symtab_hdr->sh_info];
448 while (h->root.type == bfd_link_hash_indirect
449 || h->root.type == bfd_link_hash_warning)
450 h = (struct elf_link_hash_entry *) h->root.u.i.link;
451 }
452
453 switch (ELF32_R_TYPE (rel->r_info))
454 {
455 /* This relocation describes a 16-bit pointer to a function.
456 We may need to allocate a thunk in low memory; reserve memory
457 for it now. */
458 case R_XSTORMY16_FPTR16:
459 if (rel->r_addend != 0)
460 {
461 (*info->callbacks->warning)
462 (info, _("non-zero addend in @fptr reloc"), 0,
463 abfd, 0, 0);
464 }
465
466 if (dynobj == NULL)
467 elf_hash_table (info)->dynobj = dynobj = abfd;
468 if (splt == NULL)
469 {
470 splt = bfd_get_section_by_name (dynobj, ".plt");
471 if (splt == NULL)
472 {
473 splt = bfd_make_section (dynobj, ".plt");
474 if (splt == NULL
475 || ! bfd_set_section_flags (dynobj, splt,
476 (SEC_ALLOC
477 | SEC_LOAD
478 | SEC_HAS_CONTENTS
479 | SEC_IN_MEMORY
480 | SEC_LINKER_CREATED
481 | SEC_READONLY
482 | SEC_CODE))
483 || ! bfd_set_section_alignment (dynobj, splt, 1))
b34976b6 484 return FALSE;
93fbbb04
GK		 485 }
486 }
487
488 if (h != NULL)
489 offset = &h->plt.offset;
490 else
491 {
492 if (local_plt_offsets == NULL)
493 {
494 size_t size;
495 unsigned int i;
496
497 size = symtab_hdr->sh_info * sizeof (bfd_vma);
498 local_plt_offsets = (bfd_vma *) bfd_alloc (abfd, size);
499 if (local_plt_offsets == NULL)
b34976b6 500 return FALSE;
93fbbb04 501 elf_local_got_offsets (abfd) = local_plt_offsets;
cedb70c5 502
93fbbb04
GK		 503 for (i = 0; i < symtab_hdr->sh_info; i++)
504 local_plt_offsets[i] = (bfd_vma) -1;
505 }
506 offset = &local_plt_offsets[r_symndx];
507 }
508
509 if (*offset == (bfd_vma) -1)
510 {
eea6121a
AM		 511 *offset = splt->size;
512 splt->size += 4;
93fbbb04
GK		 513 }
514 break;
515
516 /* This relocation describes the C++ object vtable hierarchy.
517 Reconstruct it for later use during GC. */
518 case R_XSTORMY16_GNU_VTINHERIT:
c152c796 519 if (!bfd_elf_gc_record_vtinherit (abfd, sec, h, rel->r_offset))
b34976b6 520 return FALSE;
93fbbb04 521 break;
cedb70c5 522
93fbbb04
GK		 523 /* This relocation describes which C++ vtable entries are actually
524 used. Record for later use during GC. */
525 case R_XSTORMY16_GNU_VTENTRY:
c152c796 526 if (!bfd_elf_gc_record_vtentry (abfd, sec, h, rel->r_addend))
b34976b6 527 return FALSE;
93fbbb04
GK		 528 break;
529 }
530 }
531
b34976b6 532 return TRUE;
93fbbb04
GK		 533}
534
535/* A subroutine of xstormy16_elf_relax_section. If the global symbol H
536 is within the low 64k, remove any entry for it in the plt. */
537
538struct relax_plt_data
539{
540 asection *splt;
b34976b6 541 bfd_boolean *again;
93fbbb04
GK		 542};
543
b34976b6 544static bfd_boolean
93fbbb04
GK		 545xstormy16_relax_plt_check (h, xdata)
546 struct elf_link_hash_entry *h;
547 PTR xdata;
548{
549 struct relax_plt_data *data = (struct relax_plt_data *) xdata;
550
e92d460e
AM		 551 if (h->root.type == bfd_link_hash_warning)
552 h = (struct elf_link_hash_entry *) h->root.u.i.link;
553
93fbbb04
GK		 554 if (h->plt.offset != (bfd_vma) -1)
555 {
556 bfd_vma address;
557
558 if (h->root.type == bfd_link_hash_undefined
559 || h->root.type == bfd_link_hash_undefweak)
560 address = 0;
561 else
562 address = (h->root.u.def.section->output_section->vma
563 + h->root.u.def.section->output_offset
564 + h->root.u.def.value);
565
566 if (address <= 0xffff)
567 {
568 h->plt.offset = -1;
eea6121a 569 data->splt->size -= 4;
b34976b6 570 *data->again = TRUE;
93fbbb04
GK		 571 }
572 }
573
b34976b6 574 return TRUE;
93fbbb04
GK		 575}
576
577/* A subroutine of xstormy16_elf_relax_section. If the global symbol H
578 previously had a plt entry, give it a new entry offset. */
579
b34976b6 580static bfd_boolean
93fbbb04
GK		 581xstormy16_relax_plt_realloc (h, xdata)
582 struct elf_link_hash_entry *h;
583 PTR xdata;
584{
585 bfd_vma *entry = (bfd_vma *) xdata;
586
e92d460e
AM		 587 if (h->root.type == bfd_link_hash_warning)
588 h = (struct elf_link_hash_entry *) h->root.u.i.link;
589
93fbbb04
GK		 590 if (h->plt.offset != (bfd_vma) -1)
591 {
592 h->plt.offset = *entry;
593 *entry += 4;
594 }
595
b34976b6 596 return TRUE;
93fbbb04
GK		 597}
598
b34976b6 599static bfd_boolean
93fbbb04
GK		 600xstormy16_elf_relax_section (dynobj, splt, info, again)
601 bfd *dynobj;
602 asection *splt;
603 struct bfd_link_info *info;
b34976b6 604 bfd_boolean *again;
93fbbb04
GK		 605{
606 struct relax_plt_data relax_plt_data;
607 bfd *ibfd;
608
609 /* Assume nothing changes. */
b34976b6 610 *again = FALSE;
93fbbb04 611
1049f94e 612 if (info->relocatable)
b34976b6 613 return TRUE;
93fbbb04
GK		 614
615 /* We only relax the .plt section at the moment. */
616 if (dynobj != elf_hash_table (info)->dynobj
617 || strcmp (splt->name, ".plt") != 0)
b34976b6 618 return TRUE;
93fbbb04
GK		 619
620 /* Quick check for an empty plt. */
eea6121a 621 if (splt->size == 0)
b34976b6 622 return TRUE;
93fbbb04 623
cedb70c5 624 /* Map across all global symbols; see which ones happen to
93fbbb04
GK		 625 fall in the low 64k. */
626 relax_plt_data.splt = splt;
627 relax_plt_data.again = again;
628 elf_link_hash_traverse (elf_hash_table (info), xstormy16_relax_plt_check,
629 &relax_plt_data);
630
631 /* Likewise for local symbols, though that's somewhat less convenient
6cdc0ccc 632 as we have to walk the list of input bfds and swap in symbol data. */
93fbbb04
GK		 633 for (ibfd = info->input_bfds; ibfd ; ibfd = ibfd->link_next)
634 {
635 bfd_vma *local_plt_offsets = elf_local_got_offsets (ibfd);
636 Elf_Internal_Shdr *symtab_hdr;
6cdc0ccc 637 Elf_Internal_Sym *isymbuf = NULL;
93fbbb04
GK		 638 unsigned int idx;
639
640 if (! local_plt_offsets)
641 continue;
642
643 symtab_hdr = &elf_tdata (ibfd)->symtab_hdr;
6cdc0ccc 644 if (symtab_hdr->sh_info != 0)
93fbbb04 645 {
6cdc0ccc
AM		 646 isymbuf = (Elf_Internal_Sym *) symtab_hdr->contents;
647 if (isymbuf == NULL)
648 isymbuf = bfd_elf_get_elf_syms (ibfd, symtab_hdr,
649 symtab_hdr->sh_info, 0,
650 NULL, NULL, NULL);
651 if (isymbuf == NULL)
b34976b6 652 return FALSE;
9ad5cbcf
AM		 653 }
654
93fbbb04
GK		 655 for (idx = 0; idx < symtab_hdr->sh_info; ++idx)
656 {
6cdc0ccc 657 Elf_Internal_Sym *isym;
93fbbb04
GK		 658 asection *tsec;
659 bfd_vma address;
660
661 if (local_plt_offsets[idx] == (bfd_vma) -1)
662 continue;
663
6cdc0ccc
AM		 664 isym = &isymbuf[idx];
665 if (isym->st_shndx == SHN_UNDEF)
93fbbb04 666 continue;
6cdc0ccc 667 else if (isym->st_shndx == SHN_ABS)
93fbbb04 668 tsec = bfd_abs_section_ptr;
6cdc0ccc 669 else if (isym->st_shndx == SHN_COMMON)
9ad5cbcf 670 tsec = bfd_com_section_ptr;
93fbbb04 671 else
6cdc0ccc 672 tsec = bfd_section_from_elf_index (ibfd, isym->st_shndx);
93fbbb04
GK		 673
674 address = (tsec->output_section->vma
675 + tsec->output_offset
6cdc0ccc 676 + isym->st_value);
93fbbb04
GK		 677 if (address <= 0xffff)
678 {
679 local_plt_offsets[idx] = -1;
eea6121a 680 splt->size -= 4;
b34976b6 681 *again = TRUE;
93fbbb04
GK		 682 }
683 }
684
6cdc0ccc
AM		 685 if (isymbuf != NULL
686 && symtab_hdr->contents != (unsigned char *) isymbuf)
687 {
688 if (! info->keep_memory)
689 free (isymbuf);
690 else
691 {
692 /* Cache the symbols for elf_link_input_bfd. */
693 symtab_hdr->contents = (unsigned char *) isymbuf;
694 }
695 }
93fbbb04
GK		 696 }
697
698 /* If we changed anything, walk the symbols again to reallocate
699 .plt entry addresses. */
eea6121a 700 if (*again && splt->size > 0)
93fbbb04
GK		 701 {
702 bfd_vma entry = 0;
703
704 elf_link_hash_traverse (elf_hash_table (info),
705 xstormy16_relax_plt_realloc, &entry);
706
707 for (ibfd = info->input_bfds; ibfd ; ibfd = ibfd->link_next)
708 {
709 bfd_vma *local_plt_offsets = elf_local_got_offsets (ibfd);
710 unsigned int nlocals = elf_tdata (ibfd)->symtab_hdr.sh_info;
711 unsigned int idx;
712
713 if (! local_plt_offsets)
714 continue;
715
716 for (idx = 0; idx < nlocals; ++idx)
717 if (local_plt_offsets[idx] != (bfd_vma) -1)
718 {
719 local_plt_offsets[idx] = entry;
720 entry += 4;
721 }
722 }
723 }
724
b34976b6 725 return TRUE;
93fbbb04
GK		 726}
727
b34976b6 728static bfd_boolean
93fbbb04
GK		 729xstormy16_elf_always_size_sections (output_bfd, info)
730 bfd *output_bfd ATTRIBUTE_UNUSED;
731 struct bfd_link_info *info;
732{
733 bfd *dynobj;
734 asection *splt;
735
1049f94e 736 if (info->relocatable)
b34976b6 737 return TRUE;
93fbbb04
GK		 738
739 dynobj = elf_hash_table (info)->dynobj;
740 if (dynobj == NULL)
b34976b6 741 return TRUE;
93fbbb04
GK		 742
743 splt = bfd_get_section_by_name (dynobj, ".plt");
744 BFD_ASSERT (splt != NULL);
745
eea6121a 746 splt->contents = (bfd_byte *) bfd_zalloc (dynobj, splt->size);
93fbbb04 747 if (splt->contents == NULL)
b34976b6 748 return FALSE;
93fbbb04 749
b34976b6 750 return TRUE;
93fbbb04
GK		 751}
752\f
753/* Relocate an XSTORMY16 ELF section.
93fbbb04
GK		 754
755 The RELOCATE_SECTION function is called by the new ELF backend linker
756 to handle the relocations for a section.
757
758 The relocs are always passed as Rela structures; if the section
759 actually uses Rel structures, the r_addend field will always be
760 zero.
761
762 This function is responsible for adjusting the section contents as
1049f94e 763 necessary, and (if using Rela relocs and generating a relocatable
93fbbb04
GK		 764 output file) adjusting the reloc addend as necessary.
765
766 This function does not have to worry about setting the reloc
767 address or the reloc symbol index.
768
769 LOCAL_SYMS is a pointer to the swapped in local symbols.
770
771 LOCAL_SECTIONS is an array giving the section in the input file
772 corresponding to the st_shndx field of each local symbol.
773
774 The global hash table entry for the global symbols can be found
775 via elf_sym_hashes (input_bfd).
776
1049f94e 777 When generating relocatable output, this function must handle
93fbbb04
GK		 778 STB_LOCAL/STT_SECTION symbols specially. The output symbol is
779 going to be the section symbol corresponding to the output
780 section, which means that the addend must be adjusted
781 accordingly. */
782
b34976b6 783static bfd_boolean
93fbbb04
GK		 784xstormy16_elf_relocate_section (output_bfd, info, input_bfd, input_section,
785 contents, relocs, local_syms, local_sections)
786 bfd * output_bfd ATTRIBUTE_UNUSED;
787 struct bfd_link_info * info;
788 bfd * input_bfd;
789 asection * input_section;
790 bfd_byte * contents;
791 Elf_Internal_Rela * relocs;
792 Elf_Internal_Sym * local_syms;
793 asection ** local_sections;
794{
795 Elf_Internal_Shdr * symtab_hdr;
796 struct elf_link_hash_entry ** sym_hashes;
797 Elf_Internal_Rela * rel;
798 Elf_Internal_Rela * relend;
799 bfd *dynobj;
800 asection *splt;
801
1049f94e 802 if (info->relocatable)
b34976b6 803 return TRUE;
b491616a 804
93fbbb04
GK		 805 symtab_hdr = & elf_tdata (input_bfd)->symtab_hdr;
806 sym_hashes = elf_sym_hashes (input_bfd);
807 relend = relocs + input_section->reloc_count;
808
809 dynobj = elf_hash_table (info)->dynobj;
810 splt = NULL;
811 if (dynobj != NULL)
812 splt = bfd_get_section_by_name (dynobj, ".plt");
813
814 for (rel = relocs; rel < relend; rel ++)
815 {
816 reloc_howto_type * howto;
817 unsigned long r_symndx;
818 Elf_Internal_Sym * sym;
819 asection * sec;
820 struct elf_link_hash_entry * h;
821 bfd_vma relocation;
822 bfd_reloc_status_type r;
823 const char * name = NULL;
824 int r_type;
cedb70c5 825
93fbbb04 826 r_type = ELF32_R_TYPE (rel->r_info);
cedb70c5 827
93fbbb04
GK		 828 if ( r_type == R_XSTORMY16_GNU_VTINHERIT
829 || r_type == R_XSTORMY16_GNU_VTENTRY)
830 continue;
cedb70c5 831
93fbbb04 832 r_symndx = ELF32_R_SYM (rel->r_info);
93fbbb04
GK		 833 howto = xstormy16_elf_howto_table + ELF32_R_TYPE (rel->r_info);
834 h = NULL;
835 sym = NULL;
836 sec = NULL;
cedb70c5 837
93fbbb04
GK		 838 if (r_symndx < symtab_hdr->sh_info)
839 {
840 sym = local_syms + r_symndx;
841 sec = local_sections [r_symndx];
8517fae7 842 relocation = _bfd_elf_rela_local_sym (output_bfd, sym, &sec, rel);
93fbbb04
GK		 843 }
844 else
845 {
59c2e50f 846 bfd_boolean unresolved_reloc, warned;
cedb70c5 847
b2a8e766
AM		 848 RELOC_FOR_GLOBAL_SYMBOL (info, input_bfd, input_section, rel,
849 r_symndx, symtab_hdr, sym_hashes,
850 h, sec, relocation,
851 unresolved_reloc, warned);
93fbbb04 852 }
cedb70c5 853
00d962d1
NC		 854 if (h != NULL)
855 name = h->root.root.string;
856 else
857 {
858 name = (bfd_elf_string_from_elf_section
859 (input_bfd, symtab_hdr->sh_link, sym->st_name));
860 if (name == NULL || *name == '\0')
861 name = bfd_section_name (input_bfd, sec);
862 }
863
93fbbb04
GK		 864 switch (ELF32_R_TYPE (rel->r_info))
865 {
866 case R_XSTORMY16_24:
867 {
868 bfd_vma reloc = relocation + rel->r_addend;
869 unsigned int x;
cedb70c5 870
93fbbb04
GK		 871 x = bfd_get_32 (input_bfd, contents + rel->r_offset);
872 x &= 0x0000ff00;
873 x |= reloc & 0xff;
874 x |= (reloc << 8) & 0xffff0000;
875 bfd_put_32 (input_bfd, x, contents + rel->r_offset);
876
877 if (reloc & ~0xffffff)
878 r = bfd_reloc_overflow;
879 else
880 r = bfd_reloc_ok;
881 break;
882 }
883
884 case R_XSTORMY16_FPTR16:
885 {
886 bfd_vma *plt_offset;
887
888 if (h != NULL)
889 plt_offset = &h->plt.offset;
890 else
891 plt_offset = elf_local_got_offsets (input_bfd) + r_symndx;
892
893 if (relocation <= 0xffff)
894 {
895 /* If the symbol is in range for a 16-bit address, we should
896 have deallocated the plt entry in relax_section. */
897 BFD_ASSERT (*plt_offset == (bfd_vma) -1);
898 }
899 else
900 {
901 /* If the symbol is out of range for a 16-bit address,
902 we must have allocated a plt entry. */
903 BFD_ASSERT (*plt_offset != (bfd_vma) -1);
904
905 /* If this is the first time we've processed this symbol,
906 fill in the plt entry with the correct symbol address. */
907 if ((*plt_offset & 1) == 0)
908 {
909 unsigned int x;
910
911 x = 0x00000200; /* jmpf */
912 x |= relocation & 0xff;
913 x |= (relocation << 8) & 0xffff0000;
914 bfd_put_32 (input_bfd, x, splt->contents + *plt_offset);
915 *plt_offset |= 1;
916 }
917
918 relocation = (splt->output_section->vma
919 + splt->output_offset
920 + (*plt_offset & -2));
921 }
922 r = _bfd_final_link_relocate (howto, input_bfd, input_section,
923 contents, rel->r_offset,
924 relocation, 0);
925 break;
926 }
927
928 default:
929 r = _bfd_final_link_relocate (howto, input_bfd, input_section,
930 contents, rel->r_offset,
931 relocation, rel->r_addend);
932 break;
933 }
934
935 if (r != bfd_reloc_ok)
936 {
937 const char * msg = (const char *) NULL;
938
939 switch (r)
940 {
941 case bfd_reloc_overflow:
942 r = info->callbacks->reloc_overflow
dfeffb9f
L		 943 (info, (h ? &h->root : NULL), name, howto->name,
944 (bfd_vma) 0, input_bfd, input_section, rel->r_offset);
93fbbb04 945 break;
cedb70c5 946
93fbbb04
GK		 947 case bfd_reloc_undefined:
948 r = info->callbacks->undefined_symbol
949 (info, name, input_bfd, input_section, rel->r_offset,
b34976b6 950 TRUE);
93fbbb04 951 break;
cedb70c5 952
93fbbb04
GK		 953 case bfd_reloc_outofrange:
954 msg = _("internal error: out of range error");
955 break;
956
957 case bfd_reloc_notsupported:
958 msg = _("internal error: unsupported relocation error");
959 break;
960
961 case bfd_reloc_dangerous:
962 msg = _("internal error: dangerous relocation");
963 break;
964
965 default:
966 msg = _("internal error: unknown error");
967 break;
968 }
969
970 if (msg)
971 r = info->callbacks->warning
972 (info, msg, name, input_bfd, input_section, rel->r_offset);
973
974 if (! r)
b34976b6 975 return FALSE;
93fbbb04
GK		 976 }
977 }
978
b34976b6 979 return TRUE;
93fbbb04
GK		 980}
981
982/* This must exist if dynobj is ever set. */
983
b34976b6 984static bfd_boolean
93fbbb04
GK		 985xstormy16_elf_finish_dynamic_sections (abfd, info)
986 bfd *abfd ATTRIBUTE_UNUSED;
987 struct bfd_link_info *info;
988{
989 bfd *dynobj;
990 asection *splt;
991
992 /* As an extra sanity check, verify that all plt entries have
993 been filled in. */
994
995 if ((dynobj = elf_hash_table (info)->dynobj) != NULL
996 && (splt = bfd_get_section_by_name (dynobj, ".plt")) != NULL)
997 {
998 bfd_byte *contents = splt->contents;
eea6121a 999 unsigned int i, size = splt->size;
93fbbb04
GK		 1000 for (i = 0; i < size; i += 4)
1001 {
1002 unsigned int x = bfd_get_32 (dynobj, contents + i);
1003 BFD_ASSERT (x != 0);
1004 }
1005 }
1006
b34976b6 1007 return TRUE;
93fbbb04
GK		 1008}
1009\f
1010/* Return the section that should be marked against GC for a given
1011 relocation. */
1012
1013static asection *
1e2f5b6e
AM		 1014xstormy16_elf_gc_mark_hook (sec, info, rel, h, sym)
1015 asection * sec;
93fbbb04
GK		 1016 struct bfd_link_info * info ATTRIBUTE_UNUSED;
1017 Elf_Internal_Rela * rel;
1018 struct elf_link_hash_entry * h;
1019 Elf_Internal_Sym * sym;
1020{
1021 if (h != NULL)
1022 {
1023 switch (ELF32_R_TYPE (rel->r_info))
1024 {
1025 case R_XSTORMY16_GNU_VTINHERIT:
1026 case R_XSTORMY16_GNU_VTENTRY:
1027 break;
1028
1029 default:
1030 switch (h->root.type)
1031 {
1032 case bfd_link_hash_defined:
1033 case bfd_link_hash_defweak:
1034 return h->root.u.def.section;
1035
1036 case bfd_link_hash_common:
1037 return h->root.u.c.p->section;
1038
1039 default:
1040 break;
1041 }
1042 }
1043 }
1044 else
1e2f5b6e 1045 return bfd_section_from_elf_index (sec->owner, sym->st_shndx);
93fbbb04
GK		 1046
1047 return NULL;
1048}
1049
1050/* Update the got entry reference counts for the section being removed. */
1051
b34976b6 1052static bfd_boolean
93fbbb04
GK		 1053xstormy16_elf_gc_sweep_hook (abfd, info, sec, relocs)
1054 bfd * abfd ATTRIBUTE_UNUSED;
1055 struct bfd_link_info * info ATTRIBUTE_UNUSED;
1056 asection * sec ATTRIBUTE_UNUSED;
1057 const Elf_Internal_Rela * relocs ATTRIBUTE_UNUSED;
1058{
b34976b6 1059 return TRUE;
93fbbb04
GK		 1060}
1061\f
1062#define ELF_ARCH bfd_arch_xstormy16
1063#define ELF_MACHINE_CODE EM_XSTORMY16
1064#define ELF_MAXPAGESIZE 0x100
1065
1066#define TARGET_LITTLE_SYM bfd_elf32_xstormy16_vec
1067#define TARGET_LITTLE_NAME "elf32-xstormy16"
1068
1069#define elf_info_to_howto_rel NULL
1070#define elf_info_to_howto xstormy16_info_to_howto_rela
1071#define elf_backend_relocate_section xstormy16_elf_relocate_section
1072#define elf_backend_gc_mark_hook xstormy16_elf_gc_mark_hook
1073#define elf_backend_gc_sweep_hook xstormy16_elf_gc_sweep_hook
1074#define elf_backend_check_relocs xstormy16_elf_check_relocs
1075#define elf_backend_always_size_sections \
1076 xstormy16_elf_always_size_sections
1077#define elf_backend_finish_dynamic_sections \
1078 xstormy16_elf_finish_dynamic_sections
1079
1080#define elf_backend_can_gc_sections 1
b491616a 1081#define elf_backend_rela_normal 1
93fbbb04
GK		 1082
1083#define bfd_elf32_bfd_reloc_type_lookup xstormy16_reloc_type_lookup
1084#define bfd_elf32_bfd_relax_section xstormy16_elf_relax_section
1085
1086#include "elf32-target.h"
GDB Binutils - Deliverables
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