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20135e4c NC |
1 | /* moxie-specific support for 32-bit ELF. |
2 | Copyright 2008 Anthony Green. | |
3 | Copyright 2009 Free Software Foundation, Inc. | |
4 | ||
5 | Copied from elf32-fr30.c which is.. | |
6 | Copyright 1998, 1999, 2000, 2001, 2002, 2003, 2004, 2005, 2006, 2007 | |
7 | Free Software Foundation, Inc. | |
8 | ||
9 | This file is part of BFD, the Binary File Descriptor library. | |
10 | ||
11 | This program is free software; you can redistribute it and/or modify | |
12 | it under the terms of the GNU General Public License as published by | |
13 | the Free Software Foundation; either version 3 of the License, or | |
14 | (at your option) any later version. | |
15 | ||
16 | This program is distributed in the hope that it will be useful, | |
17 | but WITHOUT ANY WARRANTY; without even the implied warranty of | |
18 | MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the | |
19 | GNU General Public License for more details. | |
20 | ||
21 | You should have received a copy of the GNU General Public License | |
22 | along with this program; if not, write to the Free Software | |
23 | Foundation, Inc., 51 Franklin Street - Fifth Floor, Boston, | |
24 | MA 02110-1301, USA. */ | |
25 | ||
26 | #include "sysdep.h" | |
27 | #include "bfd.h" | |
28 | #include "libbfd.h" | |
29 | #include "elf-bfd.h" | |
30 | #include "elf/moxie.h" | |
31 | ||
32 | /* Forward declarations. */ | |
33 | ||
34 | static reloc_howto_type moxie_elf_howto_table [] = | |
35 | { | |
36 | /* This reloc does nothing. */ | |
37 | HOWTO (R_MOXIE_NONE, /* type */ | |
38 | 0, /* rightshift */ | |
39 | 2, /* size (0 = byte, 1 = short, 2 = long) */ | |
40 | 32, /* bitsize */ | |
41 | FALSE, /* pc_relative */ | |
42 | 0, /* bitpos */ | |
43 | complain_overflow_bitfield, /* complain_on_overflow */ | |
44 | bfd_elf_generic_reloc, /* special_function */ | |
45 | "R_MOXIE_NONE", /* name */ | |
46 | FALSE, /* partial_inplace */ | |
47 | 0, /* src_mask */ | |
48 | 0, /* dst_mask */ | |
49 | FALSE), /* pcrel_offset */ | |
50 | ||
51 | /* A 32 bit absolute relocation. */ | |
52 | HOWTO (R_MOXIE_32, /* type */ | |
53 | 0, /* rightshift */ | |
54 | 2, /* size (0 = byte, 1 = short, 2 = long) */ | |
55 | 32, /* bitsize */ | |
56 | FALSE, /* pc_relative */ | |
57 | 0, /* bitpos */ | |
58 | complain_overflow_bitfield, /* complain_on_overflow */ | |
59 | bfd_elf_generic_reloc, /* special_function */ | |
60 | "R_MOXIE_32", /* name */ | |
61 | FALSE, /* partial_inplace */ | |
62 | 0x00000000, /* src_mask */ | |
63 | 0xffffffff, /* dst_mask */ | |
64 | FALSE), /* pcrel_offset */ | |
65 | }; | |
66 | \f | |
67 | /* Map BFD reloc types to MOXIE ELF reloc types. */ | |
68 | ||
69 | struct moxie_reloc_map | |
70 | { | |
71 | bfd_reloc_code_real_type bfd_reloc_val; | |
72 | unsigned int moxie_reloc_val; | |
73 | }; | |
74 | ||
75 | static const struct moxie_reloc_map moxie_reloc_map [] = | |
76 | { | |
77 | { BFD_RELOC_NONE, R_MOXIE_NONE }, | |
78 | { BFD_RELOC_32, R_MOXIE_32 }, | |
79 | }; | |
80 | ||
81 | static reloc_howto_type * | |
82 | moxie_reloc_type_lookup (bfd *abfd ATTRIBUTE_UNUSED, | |
83 | bfd_reloc_code_real_type code) | |
84 | { | |
85 | unsigned int i; | |
86 | ||
87 | for (i = sizeof (moxie_reloc_map) / sizeof (moxie_reloc_map[0]); | |
88 | --i;) | |
89 | if (moxie_reloc_map [i].bfd_reloc_val == code) | |
90 | return & moxie_elf_howto_table [moxie_reloc_map[i].moxie_reloc_val]; | |
91 | ||
92 | return NULL; | |
93 | } | |
94 | ||
95 | static reloc_howto_type * | |
96 | moxie_reloc_name_lookup (bfd *abfd ATTRIBUTE_UNUSED, const char *r_name) | |
97 | { | |
98 | unsigned int i; | |
99 | ||
100 | for (i = 0; | |
101 | i < sizeof (moxie_elf_howto_table) / sizeof (moxie_elf_howto_table[0]); | |
102 | i++) | |
103 | if (moxie_elf_howto_table[i].name != NULL | |
104 | && strcasecmp (moxie_elf_howto_table[i].name, r_name) == 0) | |
105 | return &moxie_elf_howto_table[i]; | |
106 | ||
107 | return NULL; | |
108 | } | |
109 | ||
110 | /* Set the howto pointer for an MOXIE ELF reloc. */ | |
111 | ||
112 | static void | |
113 | moxie_info_to_howto_rela (bfd *abfd ATTRIBUTE_UNUSED, | |
114 | arelent *cache_ptr, | |
115 | Elf_Internal_Rela *dst) | |
116 | { | |
117 | unsigned int r_type; | |
118 | ||
119 | r_type = ELF32_R_TYPE (dst->r_info); | |
120 | BFD_ASSERT (r_type < (unsigned int) R_MOXIE_max); | |
121 | cache_ptr->howto = & moxie_elf_howto_table [r_type]; | |
122 | } | |
123 | \f | |
124 | /* Perform a single relocation. By default we use the standard BFD | |
125 | routines, but a few relocs, we have to do them ourselves. */ | |
126 | ||
127 | static bfd_reloc_status_type | |
128 | moxie_final_link_relocate (reloc_howto_type *howto, | |
129 | bfd *input_bfd, | |
130 | asection *input_section, | |
131 | bfd_byte *contents, | |
132 | Elf_Internal_Rela *rel, | |
133 | bfd_vma relocation) | |
134 | { | |
135 | bfd_reloc_status_type r = bfd_reloc_ok; | |
136 | ||
137 | switch (howto->type) | |
138 | { | |
139 | default: | |
140 | r = _bfd_final_link_relocate (howto, input_bfd, input_section, | |
141 | contents, rel->r_offset, | |
142 | relocation, rel->r_addend); | |
143 | } | |
144 | ||
145 | return r; | |
146 | } | |
147 | \f | |
148 | /* Relocate an MOXIE ELF section. | |
149 | ||
150 | The RELOCATE_SECTION function is called by the new ELF backend linker | |
151 | to handle the relocations for a section. | |
152 | ||
153 | The relocs are always passed as Rela structures; if the section | |
154 | actually uses Rel structures, the r_addend field will always be | |
155 | zero. | |
156 | ||
157 | This function is responsible for adjusting the section contents as | |
158 | necessary, and (if using Rela relocs and generating a relocatable | |
159 | output file) adjusting the reloc addend as necessary. | |
160 | ||
161 | This function does not have to worry about setting the reloc | |
162 | address or the reloc symbol index. | |
163 | ||
164 | LOCAL_SYMS is a pointer to the swapped in local symbols. | |
165 | ||
166 | LOCAL_SECTIONS is an array giving the section in the input file | |
167 | corresponding to the st_shndx field of each local symbol. | |
168 | ||
169 | The global hash table entry for the global symbols can be found | |
170 | via elf_sym_hashes (input_bfd). | |
171 | ||
172 | When generating relocatable output, this function must handle | |
173 | STB_LOCAL/STT_SECTION symbols specially. The output symbol is | |
174 | going to be the section symbol corresponding to the output | |
175 | section, which means that the addend must be adjusted | |
176 | accordingly. */ | |
177 | ||
178 | static bfd_boolean | |
179 | moxie_elf_relocate_section (bfd *output_bfd, | |
180 | struct bfd_link_info *info, | |
181 | bfd *input_bfd, | |
182 | asection *input_section, | |
183 | bfd_byte *contents, | |
184 | Elf_Internal_Rela *relocs, | |
185 | Elf_Internal_Sym *local_syms, | |
186 | asection **local_sections) | |
187 | { | |
188 | Elf_Internal_Shdr *symtab_hdr; | |
189 | struct elf_link_hash_entry **sym_hashes; | |
190 | Elf_Internal_Rela *rel; | |
191 | Elf_Internal_Rela *relend; | |
192 | ||
193 | symtab_hdr = & elf_tdata (input_bfd)->symtab_hdr; | |
194 | sym_hashes = elf_sym_hashes (input_bfd); | |
195 | relend = relocs + input_section->reloc_count; | |
196 | ||
197 | for (rel = relocs; rel < relend; rel ++) | |
198 | { | |
199 | reloc_howto_type *howto; | |
200 | unsigned long r_symndx; | |
201 | Elf_Internal_Sym *sym; | |
202 | asection *sec; | |
203 | struct elf_link_hash_entry *h; | |
204 | bfd_vma relocation; | |
205 | bfd_reloc_status_type r; | |
206 | const char *name; | |
207 | int r_type; | |
208 | ||
209 | r_type = ELF32_R_TYPE (rel->r_info); | |
210 | ||
211 | r_symndx = ELF32_R_SYM (rel->r_info); | |
212 | ||
213 | howto = moxie_elf_howto_table + ELF32_R_TYPE (rel->r_info); | |
214 | h = NULL; | |
215 | sym = NULL; | |
216 | sec = NULL; | |
217 | ||
218 | if (r_symndx < symtab_hdr->sh_info) | |
219 | { | |
220 | sym = local_syms + r_symndx; | |
221 | sec = local_sections [r_symndx]; | |
222 | relocation = _bfd_elf_rela_local_sym (output_bfd, sym, &sec, rel); | |
223 | ||
224 | name = bfd_elf_string_from_elf_section | |
225 | (input_bfd, symtab_hdr->sh_link, sym->st_name); | |
226 | name = (name == NULL) ? bfd_section_name (input_bfd, sec) : name; | |
227 | } | |
228 | else | |
229 | { | |
230 | bfd_boolean unresolved_reloc, warned; | |
231 | ||
232 | RELOC_FOR_GLOBAL_SYMBOL (info, input_bfd, input_section, rel, | |
233 | r_symndx, symtab_hdr, sym_hashes, | |
234 | h, sec, relocation, | |
235 | unresolved_reloc, warned); | |
236 | ||
237 | name = h->root.root.string; | |
238 | } | |
239 | ||
240 | if (sec != NULL && elf_discarded_section (sec)) | |
241 | { | |
242 | /* For relocs against symbols from removed linkonce sections, | |
243 | or sections discarded by a linker script, we just want the | |
244 | section contents zeroed. Avoid any special processing. */ | |
245 | _bfd_clear_contents (howto, input_bfd, contents + rel->r_offset); | |
246 | rel->r_info = 0; | |
247 | rel->r_addend = 0; | |
248 | continue; | |
249 | } | |
250 | ||
251 | if (info->relocatable) | |
252 | continue; | |
253 | ||
254 | r = moxie_final_link_relocate (howto, input_bfd, input_section, | |
255 | contents, rel, relocation); | |
256 | ||
257 | if (r != bfd_reloc_ok) | |
258 | { | |
259 | const char * msg = NULL; | |
260 | ||
261 | switch (r) | |
262 | { | |
263 | case bfd_reloc_overflow: | |
264 | r = info->callbacks->reloc_overflow | |
265 | (info, (h ? &h->root : NULL), name, howto->name, | |
266 | (bfd_vma) 0, input_bfd, input_section, rel->r_offset); | |
267 | break; | |
268 | ||
269 | case bfd_reloc_undefined: | |
270 | r = info->callbacks->undefined_symbol | |
271 | (info, name, input_bfd, input_section, rel->r_offset, | |
272 | TRUE); | |
273 | break; | |
274 | ||
275 | case bfd_reloc_outofrange: | |
276 | msg = _("internal error: out of range error"); | |
277 | break; | |
278 | ||
279 | case bfd_reloc_notsupported: | |
280 | msg = _("internal error: unsupported relocation error"); | |
281 | break; | |
282 | ||
283 | case bfd_reloc_dangerous: | |
284 | msg = _("internal error: dangerous relocation"); | |
285 | break; | |
286 | ||
287 | default: | |
288 | msg = _("internal error: unknown error"); | |
289 | break; | |
290 | } | |
291 | ||
292 | if (msg) | |
293 | r = info->callbacks->warning | |
294 | (info, msg, name, input_bfd, input_section, rel->r_offset); | |
295 | ||
296 | if (! r) | |
297 | return FALSE; | |
298 | } | |
299 | } | |
300 | ||
301 | return TRUE; | |
302 | } | |
303 | \f | |
304 | /* Return the section that should be marked against GC for a given | |
305 | relocation. */ | |
306 | ||
307 | static asection * | |
308 | moxie_elf_gc_mark_hook (asection *sec, | |
309 | struct bfd_link_info *info, | |
310 | Elf_Internal_Rela *rel, | |
311 | struct elf_link_hash_entry *h, | |
312 | Elf_Internal_Sym *sym) | |
313 | { | |
314 | return _bfd_elf_gc_mark_hook (sec, info, rel, h, sym); | |
315 | } | |
316 | ||
317 | /* Look through the relocs for a section during the first phase. | |
318 | Since we don't do .gots or .plts, we just need to consider the | |
319 | virtual table relocs for gc. */ | |
320 | ||
321 | static bfd_boolean | |
322 | moxie_elf_check_relocs (bfd *abfd, | |
323 | struct bfd_link_info *info, | |
324 | asection *sec, | |
325 | const Elf_Internal_Rela *relocs) | |
326 | { | |
327 | Elf_Internal_Shdr *symtab_hdr; | |
328 | struct elf_link_hash_entry **sym_hashes; | |
329 | const Elf_Internal_Rela *rel; | |
330 | const Elf_Internal_Rela *rel_end; | |
331 | ||
332 | if (info->relocatable) | |
333 | return TRUE; | |
334 | ||
335 | symtab_hdr = &elf_tdata (abfd)->symtab_hdr; | |
336 | sym_hashes = elf_sym_hashes (abfd); | |
337 | ||
338 | rel_end = relocs + sec->reloc_count; | |
339 | for (rel = relocs; rel < rel_end; rel++) | |
340 | { | |
341 | struct elf_link_hash_entry *h; | |
342 | unsigned long r_symndx; | |
343 | ||
344 | r_symndx = ELF32_R_SYM (rel->r_info); | |
345 | if (r_symndx < symtab_hdr->sh_info) | |
346 | h = NULL; | |
347 | else | |
348 | { | |
349 | h = sym_hashes[r_symndx - symtab_hdr->sh_info]; | |
350 | while (h->root.type == bfd_link_hash_indirect | |
351 | || h->root.type == bfd_link_hash_warning) | |
352 | h = (struct elf_link_hash_entry *) h->root.u.i.link; | |
353 | } | |
354 | } | |
355 | ||
356 | return TRUE; | |
357 | } | |
358 | \f | |
359 | #define ELF_ARCH bfd_arch_moxie | |
360 | #define ELF_MACHINE_CODE EM_MOXIE | |
361 | #define ELF_MAXPAGESIZE 0x1 | |
362 | ||
363 | #define TARGET_BIG_SYM bfd_elf32_moxie_vec | |
364 | #define TARGET_BIG_NAME "elf32-moxie" | |
365 | ||
366 | #define elf_info_to_howto_rel NULL | |
367 | #define elf_info_to_howto moxie_info_to_howto_rela | |
368 | #define elf_backend_relocate_section moxie_elf_relocate_section | |
369 | #define elf_backend_gc_mark_hook moxie_elf_gc_mark_hook | |
370 | #define elf_backend_check_relocs moxie_elf_check_relocs | |
371 | ||
372 | #define elf_backend_can_gc_sections 1 | |
373 | #define elf_backend_rela_normal 1 | |
374 | ||
375 | #define bfd_elf32_bfd_reloc_type_lookup moxie_reloc_type_lookup | |
376 | #define bfd_elf32_bfd_reloc_name_lookup moxie_reloc_name_lookup | |
377 | ||
378 | #include "elf32-target.h" |