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20135e4c | 1 | /* moxie-specific support for 32-bit ELF. |
b90efa5b | 2 | Copyright (C) 2009-2015 Free Software Foundation, Inc. |
20135e4c NC |
3 | |
4 | Copied from elf32-fr30.c which is.. | |
b90efa5b | 5 | Copyright (C) 1998-2015 Free Software Foundation, Inc. |
20135e4c NC |
6 | |
7 | This file is part of BFD, the Binary File Descriptor library. | |
8 | ||
9 | This program is free software; you can redistribute it and/or modify | |
10 | it under the terms of the GNU General Public License as published by | |
11 | the Free Software Foundation; either version 3 of the License, or | |
12 | (at your option) any later version. | |
13 | ||
14 | This program is distributed in the hope that it will be useful, | |
15 | but WITHOUT ANY WARRANTY; without even the implied warranty of | |
16 | MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the | |
17 | GNU General Public License for more details. | |
18 | ||
19 | You should have received a copy of the GNU General Public License | |
20 | along with this program; if not, write to the Free Software | |
21 | Foundation, Inc., 51 Franklin Street - Fifth Floor, Boston, | |
22 | MA 02110-1301, USA. */ | |
23 | ||
24 | #include "sysdep.h" | |
25 | #include "bfd.h" | |
26 | #include "libbfd.h" | |
27 | #include "elf-bfd.h" | |
28 | #include "elf/moxie.h" | |
29 | ||
30 | /* Forward declarations. */ | |
31 | ||
32 | static reloc_howto_type moxie_elf_howto_table [] = | |
33 | { | |
34 | /* This reloc does nothing. */ | |
35 | HOWTO (R_MOXIE_NONE, /* type */ | |
36 | 0, /* rightshift */ | |
6346d5ca AM |
37 | 3, /* size (0 = byte, 1 = short, 2 = long) */ |
38 | 0, /* bitsize */ | |
20135e4c NC |
39 | FALSE, /* pc_relative */ |
40 | 0, /* bitpos */ | |
6346d5ca | 41 | complain_overflow_dont, /* complain_on_overflow */ |
20135e4c NC |
42 | bfd_elf_generic_reloc, /* special_function */ |
43 | "R_MOXIE_NONE", /* name */ | |
44 | FALSE, /* partial_inplace */ | |
45 | 0, /* src_mask */ | |
46 | 0, /* dst_mask */ | |
47 | FALSE), /* pcrel_offset */ | |
48 | ||
49 | /* A 32 bit absolute relocation. */ | |
50 | HOWTO (R_MOXIE_32, /* type */ | |
51 | 0, /* rightshift */ | |
52 | 2, /* size (0 = byte, 1 = short, 2 = long) */ | |
53 | 32, /* bitsize */ | |
54 | FALSE, /* pc_relative */ | |
55 | 0, /* bitpos */ | |
56 | complain_overflow_bitfield, /* complain_on_overflow */ | |
57 | bfd_elf_generic_reloc, /* special_function */ | |
58 | "R_MOXIE_32", /* name */ | |
59 | FALSE, /* partial_inplace */ | |
60 | 0x00000000, /* src_mask */ | |
61 | 0xffffffff, /* dst_mask */ | |
62 | FALSE), /* pcrel_offset */ | |
f865a31d AG |
63 | |
64 | /* A 10 bit PC-relative relocation. */ | |
65 | HOWTO (R_MOXIE_PCREL10, /* type. */ | |
66 | 1, /* rightshift. */ | |
67 | 1, /* size (0 = byte, 1 = short, 2 = long). */ | |
68 | 10, /* bitsize. */ | |
69 | TRUE, /* pc_relative. */ | |
70 | 0, /* bitpos. */ | |
71 | complain_overflow_signed, /* complain_on_overflow. */ | |
72 | bfd_elf_generic_reloc, /* special_function. */ | |
73 | "R_MOXIE_PCREL10", /* name. */ | |
74 | FALSE, /* partial_inplace. */ | |
75 | 0, /* src_mask. */ | |
76 | 0x000003FF, /* dst_mask. */ | |
77 | TRUE), /* pcrel_offset. */ | |
20135e4c NC |
78 | }; |
79 | \f | |
80 | /* Map BFD reloc types to MOXIE ELF reloc types. */ | |
81 | ||
82 | struct moxie_reloc_map | |
83 | { | |
84 | bfd_reloc_code_real_type bfd_reloc_val; | |
85 | unsigned int moxie_reloc_val; | |
86 | }; | |
87 | ||
88 | static const struct moxie_reloc_map moxie_reloc_map [] = | |
89 | { | |
f865a31d AG |
90 | { BFD_RELOC_NONE, R_MOXIE_NONE }, |
91 | { BFD_RELOC_32, R_MOXIE_32 }, | |
92 | { BFD_RELOC_MOXIE_10_PCREL, R_MOXIE_PCREL10 }, | |
20135e4c NC |
93 | }; |
94 | ||
95 | static reloc_howto_type * | |
96 | moxie_reloc_type_lookup (bfd *abfd ATTRIBUTE_UNUSED, | |
97 | bfd_reloc_code_real_type code) | |
98 | { | |
99 | unsigned int i; | |
100 | ||
101 | for (i = sizeof (moxie_reloc_map) / sizeof (moxie_reloc_map[0]); | |
0ba38529 | 102 | i--;) |
20135e4c NC |
103 | if (moxie_reloc_map [i].bfd_reloc_val == code) |
104 | return & moxie_elf_howto_table [moxie_reloc_map[i].moxie_reloc_val]; | |
105 | ||
106 | return NULL; | |
107 | } | |
108 | ||
109 | static reloc_howto_type * | |
110 | moxie_reloc_name_lookup (bfd *abfd ATTRIBUTE_UNUSED, const char *r_name) | |
111 | { | |
112 | unsigned int i; | |
113 | ||
114 | for (i = 0; | |
115 | i < sizeof (moxie_elf_howto_table) / sizeof (moxie_elf_howto_table[0]); | |
116 | i++) | |
117 | if (moxie_elf_howto_table[i].name != NULL | |
118 | && strcasecmp (moxie_elf_howto_table[i].name, r_name) == 0) | |
119 | return &moxie_elf_howto_table[i]; | |
120 | ||
121 | return NULL; | |
122 | } | |
123 | ||
124 | /* Set the howto pointer for an MOXIE ELF reloc. */ | |
125 | ||
126 | static void | |
127 | moxie_info_to_howto_rela (bfd *abfd ATTRIBUTE_UNUSED, | |
128 | arelent *cache_ptr, | |
129 | Elf_Internal_Rela *dst) | |
130 | { | |
131 | unsigned int r_type; | |
132 | ||
133 | r_type = ELF32_R_TYPE (dst->r_info); | |
5860e3f8 NC |
134 | if (r_type >= (unsigned int) R_MOXIE_max) |
135 | { | |
64d29018 | 136 | _bfd_error_handler (_("%B: invalid Moxie reloc number: %d"), abfd, r_type); |
5860e3f8 NC |
137 | r_type = 0; |
138 | } | |
20135e4c NC |
139 | cache_ptr->howto = & moxie_elf_howto_table [r_type]; |
140 | } | |
141 | \f | |
142 | /* Perform a single relocation. By default we use the standard BFD | |
143 | routines, but a few relocs, we have to do them ourselves. */ | |
144 | ||
145 | static bfd_reloc_status_type | |
146 | moxie_final_link_relocate (reloc_howto_type *howto, | |
147 | bfd *input_bfd, | |
148 | asection *input_section, | |
149 | bfd_byte *contents, | |
150 | Elf_Internal_Rela *rel, | |
151 | bfd_vma relocation) | |
152 | { | |
153 | bfd_reloc_status_type r = bfd_reloc_ok; | |
154 | ||
155 | switch (howto->type) | |
156 | { | |
157 | default: | |
158 | r = _bfd_final_link_relocate (howto, input_bfd, input_section, | |
159 | contents, rel->r_offset, | |
160 | relocation, rel->r_addend); | |
161 | } | |
162 | ||
163 | return r; | |
164 | } | |
165 | \f | |
166 | /* Relocate an MOXIE ELF section. | |
167 | ||
168 | The RELOCATE_SECTION function is called by the new ELF backend linker | |
169 | to handle the relocations for a section. | |
170 | ||
171 | The relocs are always passed as Rela structures; if the section | |
172 | actually uses Rel structures, the r_addend field will always be | |
173 | zero. | |
174 | ||
175 | This function is responsible for adjusting the section contents as | |
176 | necessary, and (if using Rela relocs and generating a relocatable | |
177 | output file) adjusting the reloc addend as necessary. | |
178 | ||
179 | This function does not have to worry about setting the reloc | |
180 | address or the reloc symbol index. | |
181 | ||
182 | LOCAL_SYMS is a pointer to the swapped in local symbols. | |
183 | ||
184 | LOCAL_SECTIONS is an array giving the section in the input file | |
185 | corresponding to the st_shndx field of each local symbol. | |
186 | ||
187 | The global hash table entry for the global symbols can be found | |
188 | via elf_sym_hashes (input_bfd). | |
189 | ||
190 | When generating relocatable output, this function must handle | |
191 | STB_LOCAL/STT_SECTION symbols specially. The output symbol is | |
192 | going to be the section symbol corresponding to the output | |
193 | section, which means that the addend must be adjusted | |
194 | accordingly. */ | |
195 | ||
196 | static bfd_boolean | |
197 | moxie_elf_relocate_section (bfd *output_bfd, | |
198 | struct bfd_link_info *info, | |
199 | bfd *input_bfd, | |
200 | asection *input_section, | |
201 | bfd_byte *contents, | |
202 | Elf_Internal_Rela *relocs, | |
203 | Elf_Internal_Sym *local_syms, | |
204 | asection **local_sections) | |
205 | { | |
206 | Elf_Internal_Shdr *symtab_hdr; | |
207 | struct elf_link_hash_entry **sym_hashes; | |
208 | Elf_Internal_Rela *rel; | |
209 | Elf_Internal_Rela *relend; | |
210 | ||
211 | symtab_hdr = & elf_tdata (input_bfd)->symtab_hdr; | |
212 | sym_hashes = elf_sym_hashes (input_bfd); | |
213 | relend = relocs + input_section->reloc_count; | |
214 | ||
215 | for (rel = relocs; rel < relend; rel ++) | |
216 | { | |
217 | reloc_howto_type *howto; | |
218 | unsigned long r_symndx; | |
219 | Elf_Internal_Sym *sym; | |
220 | asection *sec; | |
221 | struct elf_link_hash_entry *h; | |
222 | bfd_vma relocation; | |
223 | bfd_reloc_status_type r; | |
224 | const char *name; | |
225 | int r_type; | |
226 | ||
227 | r_type = ELF32_R_TYPE (rel->r_info); | |
20135e4c | 228 | r_symndx = ELF32_R_SYM (rel->r_info); |
c7e2358a | 229 | howto = moxie_elf_howto_table + r_type; |
20135e4c NC |
230 | h = NULL; |
231 | sym = NULL; | |
232 | sec = NULL; | |
233 | ||
234 | if (r_symndx < symtab_hdr->sh_info) | |
235 | { | |
236 | sym = local_syms + r_symndx; | |
237 | sec = local_sections [r_symndx]; | |
238 | relocation = _bfd_elf_rela_local_sym (output_bfd, sym, &sec, rel); | |
239 | ||
240 | name = bfd_elf_string_from_elf_section | |
241 | (input_bfd, symtab_hdr->sh_link, sym->st_name); | |
242 | name = (name == NULL) ? bfd_section_name (input_bfd, sec) : name; | |
243 | } | |
244 | else | |
245 | { | |
62d887d4 | 246 | bfd_boolean unresolved_reloc, warned, ignored; |
20135e4c NC |
247 | |
248 | RELOC_FOR_GLOBAL_SYMBOL (info, input_bfd, input_section, rel, | |
249 | r_symndx, symtab_hdr, sym_hashes, | |
250 | h, sec, relocation, | |
62d887d4 | 251 | unresolved_reloc, warned, ignored); |
20135e4c NC |
252 | |
253 | name = h->root.root.string; | |
254 | } | |
255 | ||
dbaa2011 | 256 | if (sec != NULL && discarded_section (sec)) |
e4067dbb | 257 | RELOC_AGAINST_DISCARDED_SECTION (info, input_bfd, input_section, |
545fd46b | 258 | rel, 1, relend, howto, 0, contents); |
20135e4c | 259 | |
0e1862bb | 260 | if (bfd_link_relocatable (info)) |
20135e4c NC |
261 | continue; |
262 | ||
263 | r = moxie_final_link_relocate (howto, input_bfd, input_section, | |
264 | contents, rel, relocation); | |
265 | ||
266 | if (r != bfd_reloc_ok) | |
267 | { | |
268 | const char * msg = NULL; | |
269 | ||
270 | switch (r) | |
271 | { | |
272 | case bfd_reloc_overflow: | |
273 | r = info->callbacks->reloc_overflow | |
274 | (info, (h ? &h->root : NULL), name, howto->name, | |
275 | (bfd_vma) 0, input_bfd, input_section, rel->r_offset); | |
276 | break; | |
277 | ||
278 | case bfd_reloc_undefined: | |
279 | r = info->callbacks->undefined_symbol | |
280 | (info, name, input_bfd, input_section, rel->r_offset, | |
281 | TRUE); | |
282 | break; | |
283 | ||
284 | case bfd_reloc_outofrange: | |
285 | msg = _("internal error: out of range error"); | |
286 | break; | |
287 | ||
288 | case bfd_reloc_notsupported: | |
289 | msg = _("internal error: unsupported relocation error"); | |
290 | break; | |
291 | ||
292 | case bfd_reloc_dangerous: | |
293 | msg = _("internal error: dangerous relocation"); | |
294 | break; | |
295 | ||
296 | default: | |
297 | msg = _("internal error: unknown error"); | |
298 | break; | |
299 | } | |
300 | ||
301 | if (msg) | |
302 | r = info->callbacks->warning | |
303 | (info, msg, name, input_bfd, input_section, rel->r_offset); | |
304 | ||
305 | if (! r) | |
306 | return FALSE; | |
307 | } | |
308 | } | |
309 | ||
310 | return TRUE; | |
311 | } | |
312 | \f | |
313 | /* Return the section that should be marked against GC for a given | |
314 | relocation. */ | |
315 | ||
316 | static asection * | |
317 | moxie_elf_gc_mark_hook (asection *sec, | |
318 | struct bfd_link_info *info, | |
319 | Elf_Internal_Rela *rel, | |
320 | struct elf_link_hash_entry *h, | |
321 | Elf_Internal_Sym *sym) | |
322 | { | |
323 | return _bfd_elf_gc_mark_hook (sec, info, rel, h, sym); | |
324 | } | |
325 | ||
326 | /* Look through the relocs for a section during the first phase. | |
327 | Since we don't do .gots or .plts, we just need to consider the | |
328 | virtual table relocs for gc. */ | |
329 | ||
330 | static bfd_boolean | |
331 | moxie_elf_check_relocs (bfd *abfd, | |
332 | struct bfd_link_info *info, | |
333 | asection *sec, | |
334 | const Elf_Internal_Rela *relocs) | |
335 | { | |
336 | Elf_Internal_Shdr *symtab_hdr; | |
337 | struct elf_link_hash_entry **sym_hashes; | |
338 | const Elf_Internal_Rela *rel; | |
339 | const Elf_Internal_Rela *rel_end; | |
340 | ||
0e1862bb | 341 | if (bfd_link_relocatable (info)) |
20135e4c NC |
342 | return TRUE; |
343 | ||
344 | symtab_hdr = &elf_tdata (abfd)->symtab_hdr; | |
345 | sym_hashes = elf_sym_hashes (abfd); | |
346 | ||
347 | rel_end = relocs + sec->reloc_count; | |
348 | for (rel = relocs; rel < rel_end; rel++) | |
349 | { | |
350 | struct elf_link_hash_entry *h; | |
351 | unsigned long r_symndx; | |
352 | ||
353 | r_symndx = ELF32_R_SYM (rel->r_info); | |
354 | if (r_symndx < symtab_hdr->sh_info) | |
355 | h = NULL; | |
356 | else | |
357 | { | |
358 | h = sym_hashes[r_symndx - symtab_hdr->sh_info]; | |
359 | while (h->root.type == bfd_link_hash_indirect | |
360 | || h->root.type == bfd_link_hash_warning) | |
361 | h = (struct elf_link_hash_entry *) h->root.u.i.link; | |
81fbe831 AM |
362 | |
363 | /* PR15323, ref flags aren't set for references in the same | |
364 | object. */ | |
365 | h->root.non_ir_ref = 1; | |
20135e4c NC |
366 | } |
367 | } | |
368 | ||
369 | return TRUE; | |
370 | } | |
371 | \f | |
372 | #define ELF_ARCH bfd_arch_moxie | |
373 | #define ELF_MACHINE_CODE EM_MOXIE | |
400cf8cb | 374 | #define ELF_MACHINE_ALT1 EM_MOXIE_OLD |
20135e4c NC |
375 | #define ELF_MAXPAGESIZE 0x1 |
376 | ||
6d00b590 | 377 | #define TARGET_BIG_SYM moxie_elf32_be_vec |
e202fa84 | 378 | #define TARGET_BIG_NAME "elf32-bigmoxie" |
6d00b590 | 379 | #define TARGET_LITTLE_SYM moxie_elf32_le_vec |
e202fa84 | 380 | #define TARGET_LITTLE_NAME "elf32-littlemoxie" |
20135e4c NC |
381 | |
382 | #define elf_info_to_howto_rel NULL | |
383 | #define elf_info_to_howto moxie_info_to_howto_rela | |
384 | #define elf_backend_relocate_section moxie_elf_relocate_section | |
385 | #define elf_backend_gc_mark_hook moxie_elf_gc_mark_hook | |
386 | #define elf_backend_check_relocs moxie_elf_check_relocs | |
387 | ||
388 | #define elf_backend_can_gc_sections 1 | |
389 | #define elf_backend_rela_normal 1 | |
390 | ||
391 | #define bfd_elf32_bfd_reloc_type_lookup moxie_reloc_type_lookup | |
392 | #define bfd_elf32_bfd_reloc_name_lookup moxie_reloc_name_lookup | |
393 | ||
394 | #include "elf32-target.h" |