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1 | /* ft32-specific support for 32-bit ELF. |
2 | Copyright (C) 2013-2015 Free Software Foundation, Inc. | |
3 | ||
4 | Copied from elf32-moxie.c which is.. | |
5 | Copyright (C) 2009-2015 Free Software Foundation, Inc. | |
6 | Free Software Foundation, Inc. | |
7 | ||
8 | This file is part of BFD, the Binary File Descriptor library. | |
9 | ||
10 | This program is free software; you can redistribute it and/or modify | |
11 | it under the terms of the GNU General Public License as published by | |
12 | the Free Software Foundation; either version 3 of the License, or | |
13 | (at your option) any later version. | |
14 | ||
15 | This program is distributed in the hope that it will be useful, | |
16 | but WITHOUT ANY WARRANTY; without even the implied warranty of | |
17 | MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the | |
18 | GNU General Public License for more details. | |
19 | ||
20 | You should have received a copy of the GNU General Public License | |
21 | along with this program; if not, write to the Free Software | |
22 | Foundation, Inc., 51 Franklin Street - Fifth Floor, Boston, | |
23 | MA 02110-1301, USA. */ | |
24 | ||
25 | #include "sysdep.h" | |
26 | #include "bfd.h" | |
27 | #include "libbfd.h" | |
28 | #include "elf-bfd.h" | |
29 | #include "elf/ft32.h" | |
30 | ||
31 | /* Forward declarations. */ | |
32 | ||
33 | static reloc_howto_type ft32_elf_howto_table [] = | |
34 | { | |
35 | /* This reloc does nothing. */ | |
36 | HOWTO (R_FT32_NONE, /* type */ | |
37 | 0, /* rightshift */ | |
38 | 2, /* size (0 = byte, 1 = short, 2 = long) */ | |
39 | 32, /* bitsize */ | |
40 | FALSE, /* pc_relative */ | |
41 | 0, /* bitpos */ | |
42 | complain_overflow_bitfield, /* complain_on_overflow */ | |
43 | bfd_elf_generic_reloc, /* special_function */ | |
44 | "R_FT32_NONE", /* name */ | |
45 | FALSE, /* partial_inplace */ | |
46 | 0, /* src_mask */ | |
47 | 0, /* dst_mask */ | |
48 | FALSE), /* pcrel_offset */ | |
49 | ||
50 | /* A 32 bit absolute relocation. */ | |
51 | ||
52 | HOWTO (R_FT32_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_FT32_32", /* name */ | |
61 | FALSE, /* partial_inplace */ | |
62 | 0x00000000, /* src_mask */ | |
63 | 0xffffffff, /* dst_mask */ | |
64 | FALSE), /* pcrel_offset */ | |
65 | ||
66 | HOWTO (R_FT32_16, /* type */ | |
67 | 0, /* rightshift */ | |
68 | 1, /* size (0 = byte, 1 = short, 2 = long) */ | |
69 | 16, /* bitsize */ | |
70 | FALSE, /* pc_relative */ | |
71 | 0, /* bitpos */ | |
72 | complain_overflow_bitfield, /* complain_on_overflow */ | |
73 | bfd_elf_generic_reloc, /* special_function */ | |
74 | "R_FT32_16", /* name */ | |
75 | FALSE, /* partial_inplace */ | |
76 | 0x00000000, /* src_mask */ | |
77 | 0x0000ffff, /* dst_mask */ | |
78 | FALSE), /* pcrel_offset */ | |
79 | ||
80 | HOWTO (R_FT32_8, /* type */ | |
81 | 0, /* rightshift */ | |
82 | 0, /* size (0 = byte, 1 = short, 2 = long) */ | |
83 | 8, /* bitsize */ | |
84 | FALSE, /* pc_relative */ | |
85 | 0, /* bitpos */ | |
86 | complain_overflow_signed, /* complain_on_overflow */ | |
87 | bfd_elf_generic_reloc, /* special_function */ | |
88 | "R_FT32_8", /* name */ | |
89 | FALSE, /* partial_inplace */ | |
90 | 0x00000000, /* src_mask */ | |
91 | 0x000000ff, /* dst_mask */ | |
92 | FALSE), /* pcrel_offset */ | |
93 | ||
94 | HOWTO (R_FT32_10, /* type */ | |
95 | 0, /* rightshift */ | |
96 | 1, /* size (0 = byte, 1 = short, 2 = long) */ | |
97 | 10, /* bitsize */ | |
98 | FALSE, /* pc_relative */ | |
99 | 4, /* bitpos */ | |
100 | complain_overflow_signed, /* complain_on_overflow */ | |
101 | bfd_elf_generic_reloc, /* special_function */ | |
102 | "R_FT32_10", /* name */ | |
103 | FALSE, /* partial_inplace */ | |
104 | 0x00000000, /* src_mask */ | |
105 | 0x00003ff0, /* dst_mask */ | |
106 | FALSE), /* pcrel_offset */ | |
107 | ||
108 | HOWTO (R_FT32_20, /* type */ | |
109 | 0, /* rightshift */ | |
110 | 2, /* size (0 = byte, 1 = short, 2 = long) */ | |
111 | 20, /* bitsize */ | |
112 | FALSE, /* pc_relative */ | |
113 | 0, /* bitpos */ | |
114 | complain_overflow_dont, /* complain_on_overflow */ | |
115 | bfd_elf_generic_reloc, /* special_function */ | |
116 | "R_FT32_20", /* name */ | |
117 | FALSE, /* partial_inplace */ | |
118 | 0x00000000, /* src_mask */ | |
119 | 0x000fffff, /* dst_mask */ | |
120 | FALSE), /* pcrel_offset */ | |
121 | ||
122 | HOWTO (R_FT32_17, /* type */ | |
123 | 0, /* rightshift */ | |
124 | 2, /* size (0 = byte, 1 = short, 2 = long) */ | |
125 | 17, /* bitsize */ | |
126 | FALSE, /* pc_relative */ | |
127 | 0, /* bitpos */ | |
128 | complain_overflow_dont, /* complain_on_overflow */ | |
129 | bfd_elf_generic_reloc, /* special_function */ | |
130 | "R_FT32_17", /* name */ | |
131 | FALSE, /* partial_inplace */ | |
132 | 0x00000000, /* src_mask */ | |
133 | 0x0001ffff, /* dst_mask */ | |
134 | FALSE), /* pcrel_offset */ | |
135 | ||
136 | HOWTO (R_FT32_18, /* type */ | |
137 | 2, /* rightshift */ | |
138 | 2, /* size (0 = byte, 1 = short, 2 = long) */ | |
139 | 18, /* bitsize */ | |
140 | FALSE, /* pc_relative */ | |
141 | 0, /* bitpos */ | |
142 | complain_overflow_signed, /* complain_on_overflow */ | |
143 | bfd_elf_generic_reloc, /* special_function */ | |
144 | "R_FT32_18", /* name */ | |
145 | FALSE, /* partial_inplace */ | |
146 | 0x00000000, /* src_mask */ | |
147 | 0x0003ffff, /* dst_mask */ | |
148 | FALSE), /* pcrel_offset */ | |
149 | ||
150 | }; | |
151 | \f | |
152 | /* Map BFD reloc types to FT32 ELF reloc types. */ | |
153 | ||
154 | struct ft32_reloc_map | |
155 | { | |
156 | bfd_reloc_code_real_type bfd_reloc_val; | |
157 | unsigned int ft32_reloc_val; | |
158 | }; | |
159 | ||
160 | static const struct ft32_reloc_map ft32_reloc_map [] = | |
161 | { | |
162 | { BFD_RELOC_NONE, R_FT32_NONE }, | |
163 | { BFD_RELOC_32, R_FT32_20 }, | |
164 | { BFD_RELOC_16, R_FT32_16 }, | |
165 | { BFD_RELOC_8, R_FT32_8 }, | |
166 | { BFD_RELOC_FT32_10, R_FT32_10 }, | |
167 | { BFD_RELOC_FT32_20, R_FT32_20 }, | |
168 | { BFD_RELOC_FT32_17, R_FT32_17 }, | |
169 | { BFD_RELOC_FT32_18, R_FT32_18 }, | |
170 | }; | |
171 | ||
172 | static reloc_howto_type * | |
173 | ft32_reloc_type_lookup (bfd *abfd ATTRIBUTE_UNUSED, | |
174 | bfd_reloc_code_real_type code) | |
175 | { | |
176 | unsigned int i; | |
177 | ||
178 | for (i = sizeof (ft32_reloc_map) / sizeof (ft32_reloc_map[0]); | |
179 | --i;) | |
180 | if (ft32_reloc_map [i].bfd_reloc_val == code) | |
181 | return & ft32_elf_howto_table [ft32_reloc_map[i].ft32_reloc_val]; | |
182 | ||
183 | return NULL; | |
184 | } | |
185 | ||
186 | static reloc_howto_type * | |
187 | ft32_reloc_name_lookup (bfd *abfd ATTRIBUTE_UNUSED, const char *r_name) | |
188 | { | |
189 | unsigned int i; | |
190 | ||
191 | for (i = 0; | |
192 | i < sizeof (ft32_elf_howto_table) / sizeof (ft32_elf_howto_table[0]); | |
193 | i++) | |
194 | if (ft32_elf_howto_table[i].name != NULL | |
195 | && strcasecmp (ft32_elf_howto_table[i].name, r_name) == 0) | |
196 | return &ft32_elf_howto_table[i]; | |
197 | ||
198 | return NULL; | |
199 | } | |
200 | ||
201 | /* Set the howto pointer for an FT32 ELF reloc. */ | |
202 | ||
203 | static void | |
204 | ft32_info_to_howto_rela (bfd *abfd ATTRIBUTE_UNUSED, | |
205 | arelent *cache_ptr, | |
206 | Elf_Internal_Rela *dst) | |
207 | { | |
208 | unsigned int r_type; | |
209 | ||
210 | r_type = ELF32_R_TYPE (dst->r_info); | |
211 | BFD_ASSERT (r_type < (unsigned int) R_FT32_max); | |
212 | cache_ptr->howto = & ft32_elf_howto_table [r_type]; | |
213 | } | |
214 | \f | |
215 | /* Relocate an FT32 ELF section. | |
216 | ||
217 | The RELOCATE_SECTION function is called by the new ELF backend linker | |
218 | to handle the relocations for a section. | |
219 | ||
220 | The relocs are always passed as Rela structures; if the section | |
221 | actually uses Rel structures, the r_addend field will always be | |
222 | zero. | |
223 | ||
224 | This function is responsible for adjusting the section contents as | |
225 | necessary, and (if using Rela relocs and generating a relocatable | |
226 | output file) adjusting the reloc addend as necessary. | |
227 | ||
228 | This function does not have to worry about setting the reloc | |
229 | address or the reloc symbol index. | |
230 | ||
231 | LOCAL_SYMS is a pointer to the swapped in local symbols. | |
232 | ||
233 | LOCAL_SECTIONS is an array giving the section in the input file | |
234 | corresponding to the st_shndx field of each local symbol. | |
235 | ||
236 | The global hash table entry for the global symbols can be found | |
237 | via elf_sym_hashes (input_bfd). | |
238 | ||
239 | When generating relocatable output, this function must handle | |
240 | STB_LOCAL/STT_SECTION symbols specially. The output symbol is | |
241 | going to be the section symbol corresponding to the output | |
242 | section, which means that the addend must be adjusted | |
243 | accordingly. */ | |
244 | ||
245 | static bfd_boolean | |
246 | ft32_elf_relocate_section (bfd *output_bfd, | |
247 | struct bfd_link_info *info, | |
248 | bfd *input_bfd, | |
249 | asection *input_section, | |
250 | bfd_byte *contents, | |
251 | Elf_Internal_Rela *relocs, | |
252 | Elf_Internal_Sym *local_syms, | |
253 | asection **local_sections) | |
254 | { | |
255 | Elf_Internal_Shdr *symtab_hdr; | |
256 | struct elf_link_hash_entry **sym_hashes; | |
257 | Elf_Internal_Rela *rel; | |
258 | Elf_Internal_Rela *relend; | |
259 | ||
260 | symtab_hdr = & elf_tdata (input_bfd)->symtab_hdr; | |
261 | sym_hashes = elf_sym_hashes (input_bfd); | |
262 | relend = relocs + input_section->reloc_count; | |
263 | ||
264 | for (rel = relocs; rel < relend; rel ++) | |
265 | { | |
266 | reloc_howto_type *howto; | |
267 | unsigned long r_symndx; | |
268 | Elf_Internal_Sym *sym; | |
269 | asection *sec; | |
270 | struct elf_link_hash_entry *h; | |
271 | bfd_vma relocation; | |
272 | bfd_reloc_status_type r; | |
273 | const char *name; | |
274 | int r_type; | |
275 | ||
276 | r_type = ELF32_R_TYPE (rel->r_info); | |
277 | r_symndx = ELF32_R_SYM (rel->r_info); | |
278 | howto = ft32_elf_howto_table + r_type; | |
279 | h = NULL; | |
280 | sym = NULL; | |
281 | sec = NULL; | |
282 | ||
283 | if (r_symndx < symtab_hdr->sh_info) | |
284 | { | |
285 | sym = local_syms + r_symndx; | |
286 | sec = local_sections [r_symndx]; | |
287 | relocation = _bfd_elf_rela_local_sym (output_bfd, sym, &sec, rel); | |
288 | ||
289 | name = bfd_elf_string_from_elf_section | |
290 | (input_bfd, symtab_hdr->sh_link, sym->st_name); | |
291 | name = (name == NULL) ? bfd_section_name (input_bfd, sec) : name; | |
292 | } | |
293 | else | |
294 | { | |
295 | bfd_boolean unresolved_reloc, warned, ignored; | |
296 | ||
297 | RELOC_FOR_GLOBAL_SYMBOL (info, input_bfd, input_section, rel, | |
298 | r_symndx, symtab_hdr, sym_hashes, | |
299 | h, sec, relocation, | |
300 | unresolved_reloc, warned, ignored); | |
301 | ||
302 | name = h->root.root.string; | |
303 | } | |
304 | ||
305 | if (sec != NULL && discarded_section (sec)) | |
306 | RELOC_AGAINST_DISCARDED_SECTION (info, input_bfd, input_section, | |
307 | rel, 1, relend, howto, 0, contents); | |
308 | ||
309 | if (info->relocatable) | |
310 | continue; | |
311 | ||
312 | r = _bfd_final_link_relocate (howto, input_bfd, input_section, | |
313 | contents, rel->r_offset, | |
314 | relocation, rel->r_addend); | |
315 | ||
316 | if (r != bfd_reloc_ok) | |
317 | { | |
318 | const char * msg = NULL; | |
319 | ||
320 | switch (r) | |
321 | { | |
322 | case bfd_reloc_overflow: | |
323 | r = info->callbacks->reloc_overflow | |
324 | (info, (h ? &h->root : NULL), name, howto->name, | |
325 | (bfd_vma) 0, input_bfd, input_section, rel->r_offset); | |
326 | break; | |
327 | ||
328 | case bfd_reloc_undefined: | |
329 | r = info->callbacks->undefined_symbol | |
330 | (info, name, input_bfd, input_section, rel->r_offset, | |
331 | TRUE); | |
332 | break; | |
333 | ||
334 | case bfd_reloc_outofrange: | |
335 | msg = _("internal error: out of range error"); | |
336 | break; | |
337 | ||
338 | case bfd_reloc_notsupported: | |
339 | msg = _("internal error: unsupported relocation error"); | |
340 | break; | |
341 | ||
342 | case bfd_reloc_dangerous: | |
343 | msg = _("internal error: dangerous relocation"); | |
344 | break; | |
345 | ||
346 | default: | |
347 | msg = _("internal error: unknown error"); | |
348 | break; | |
349 | } | |
350 | ||
351 | if (msg) | |
352 | r = info->callbacks->warning | |
353 | (info, msg, name, input_bfd, input_section, rel->r_offset); | |
354 | ||
355 | if (! r) | |
356 | return FALSE; | |
357 | } | |
358 | } | |
359 | ||
360 | return TRUE; | |
361 | } | |
362 | \f | |
363 | #define ELF_ARCH bfd_arch_ft32 | |
364 | #define ELF_MACHINE_CODE EM_FT32 | |
365 | #define ELF_MAXPAGESIZE 0x1 | |
366 | ||
367 | #define TARGET_LITTLE_SYM ft32_elf32_vec | |
368 | #define TARGET_LITTLE_NAME "elf32-ft32" | |
369 | ||
370 | #define elf_info_to_howto_rel NULL | |
371 | #define elf_info_to_howto ft32_info_to_howto_rela | |
372 | #define elf_backend_relocate_section ft32_elf_relocate_section | |
373 | ||
374 | #define elf_backend_can_gc_sections 1 | |
375 | #define elf_backend_rela_normal 1 | |
376 | ||
377 | #define bfd_elf32_bfd_reloc_type_lookup ft32_reloc_type_lookup | |
378 | #define bfd_elf32_bfd_reloc_name_lookup ft32_reloc_name_lookup | |
379 | ||
380 | #include "elf32-target.h" |