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61ba1cf9 ILT |
1 | // target-reloc.h -- target specific relocation support -*- C++ -*- |
2 | ||
ebdbb458 | 3 | // Copyright 2006, 2007, 2008 Free Software Foundation, Inc. |
6cb15b7f ILT |
4 | // Written by Ian Lance Taylor <iant@google.com>. |
5 | ||
6 | // This file is part of gold. | |
7 | ||
8 | // This program is free software; you can redistribute it and/or modify | |
9 | // it under the terms of the GNU General Public License as published by | |
10 | // the Free Software Foundation; either version 3 of the License, or | |
11 | // (at your option) any later version. | |
12 | ||
13 | // This program is distributed in the hope that it will be useful, | |
14 | // but WITHOUT ANY WARRANTY; without even the implied warranty of | |
15 | // MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the | |
16 | // GNU General Public License for more details. | |
17 | ||
18 | // You should have received a copy of the GNU General Public License | |
19 | // along with this program; if not, write to the Free Software | |
20 | // Foundation, Inc., 51 Franklin Street - Fifth Floor, Boston, | |
21 | // MA 02110-1301, USA. | |
22 | ||
61ba1cf9 ILT |
23 | #ifndef GOLD_TARGET_RELOC_H |
24 | #define GOLD_TARGET_RELOC_H | |
25 | ||
26 | #include "elfcpp.h" | |
27 | #include "symtab.h" | |
6a74a719 | 28 | #include "reloc.h" |
c06b7b0b | 29 | #include "reloc-types.h" |
61ba1cf9 ILT |
30 | |
31 | namespace gold | |
32 | { | |
33 | ||
6a74a719 ILT |
34 | // This function implements the generic part of reloc scanning. The |
35 | // template parameter Scan must be a class type which provides two | |
36 | // functions: local() and global(). Those functions implement the | |
37 | // machine specific part of scanning. We do it this way to | |
38 | // avoidmaking a function call for each relocation, and to avoid | |
39 | // repeating the generic code for each target. | |
92e059d8 | 40 | |
ead1e424 ILT |
41 | template<int size, bool big_endian, typename Target_type, int sh_type, |
42 | typename Scan> | |
92e059d8 ILT |
43 | inline void |
44 | scan_relocs( | |
45 | const General_options& options, | |
46 | Symbol_table* symtab, | |
ead1e424 ILT |
47 | Layout* layout, |
48 | Target_type* target, | |
f6ce93d6 | 49 | Sized_relobj<size, big_endian>* object, |
a3ad94ed | 50 | unsigned int data_shndx, |
92e059d8 ILT |
51 | const unsigned char* prelocs, |
52 | size_t reloc_count, | |
730cdc88 ILT |
53 | Output_section* output_section, |
54 | bool needs_special_offset_handling, | |
92e059d8 | 55 | size_t local_count, |
730cdc88 | 56 | const unsigned char* plocal_syms) |
92e059d8 ILT |
57 | { |
58 | typedef typename Reloc_types<sh_type, size, big_endian>::Reloc Reltype; | |
59 | const int reloc_size = Reloc_types<sh_type, size, big_endian>::reloc_size; | |
60 | const int sym_size = elfcpp::Elf_sizes<size>::sym_size; | |
61 | Scan scan; | |
62 | ||
63 | for (size_t i = 0; i < reloc_count; ++i, prelocs += reloc_size) | |
64 | { | |
65 | Reltype reloc(prelocs); | |
66 | ||
730cdc88 ILT |
67 | if (needs_special_offset_handling |
68 | && !output_section->is_input_address_mapped(object, data_shndx, | |
69 | reloc.get_r_offset())) | |
70 | continue; | |
71 | ||
92e059d8 ILT |
72 | typename elfcpp::Elf_types<size>::Elf_WXword r_info = reloc.get_r_info(); |
73 | unsigned int r_sym = elfcpp::elf_r_sym<size>(r_info); | |
74 | unsigned int r_type = elfcpp::elf_r_type<size>(r_info); | |
75 | ||
76 | if (r_sym < local_count) | |
77 | { | |
a3ad94ed | 78 | gold_assert(plocal_syms != NULL); |
92e059d8 ILT |
79 | typename elfcpp::Sym<size, big_endian> lsym(plocal_syms |
80 | + r_sym * sym_size); | |
d491d34e ILT |
81 | unsigned int shndx = lsym.get_st_shndx(); |
82 | bool is_ordinary; | |
83 | shndx = object->adjust_sym_shndx(r_sym, shndx, &is_ordinary); | |
84 | if (is_ordinary | |
ead1e424 | 85 | && shndx != elfcpp::SHN_UNDEF |
d491d34e | 86 | && !object->is_section_included(shndx)) |
92e059d8 ILT |
87 | { |
88 | // RELOC is a relocation against a local symbol in a | |
89 | // section we are discarding. We can ignore this | |
90 | // relocation. It will eventually become a reloc | |
91 | // against the value zero. | |
92 | // | |
93 | // FIXME: We should issue a warning if this is an | |
94 | // allocated section; is this the best place to do it? | |
95 | // | |
96 | // FIXME: The old GNU linker would in some cases look | |
97 | // for the linkonce section which caused this section to | |
98 | // be discarded, and, if the other section was the same | |
99 | // size, change the reloc to refer to the other section. | |
100 | // That seems risky and weird to me, and I don't know of | |
101 | // any case where it is actually required. | |
102 | ||
103 | continue; | |
104 | } | |
105 | ||
a3ad94ed | 106 | scan.local(options, symtab, layout, target, object, data_shndx, |
07f397ab | 107 | output_section, reloc, r_type, lsym); |
92e059d8 ILT |
108 | } |
109 | else | |
110 | { | |
730cdc88 | 111 | Symbol* gsym = object->global_symbol(r_sym); |
a3ad94ed | 112 | gold_assert(gsym != NULL); |
92e059d8 ILT |
113 | if (gsym->is_forwarder()) |
114 | gsym = symtab->resolve_forwards(gsym); | |
115 | ||
a3ad94ed | 116 | scan.global(options, symtab, layout, target, object, data_shndx, |
07f397ab | 117 | output_section, reloc, r_type, gsym); |
92e059d8 ILT |
118 | } |
119 | } | |
120 | } | |
121 | ||
e94cf127 CC |
122 | // Behavior for relocations to discarded comdat sections. |
123 | ||
124 | enum Comdat_behavior | |
125 | { | |
126 | CB_UNDETERMINED, // Not yet determined -- need to look at section name. | |
127 | CB_PRETEND, // Attempt to map to the corresponding kept section. | |
128 | CB_IGNORE, // Ignore the relocation. | |
129 | CB_WARNING // Print a warning. | |
130 | }; | |
131 | ||
132 | // Decide what the linker should do for relocations that refer to discarded | |
133 | // comdat sections. This decision is based on the name of the section being | |
134 | // relocated. | |
135 | ||
136 | inline Comdat_behavior | |
137 | get_comdat_behavior(const char* name) | |
138 | { | |
139 | if (Layout::is_debug_info_section(name)) | |
140 | return CB_PRETEND; | |
141 | if (strcmp(name, ".eh_frame") == 0 | |
142 | || strcmp(name, ".gcc_except_table") == 0) | |
143 | return CB_IGNORE; | |
144 | return CB_WARNING; | |
145 | } | |
146 | ||
92e059d8 | 147 | // This function implements the generic part of relocation processing. |
6a74a719 ILT |
148 | // The template parameter Relocate must be a class type which provides |
149 | // a single function, relocate(), which implements the machine | |
150 | // specific part of a relocation. | |
61ba1cf9 ILT |
151 | |
152 | // SIZE is the ELF size: 32 or 64. BIG_ENDIAN is the endianness of | |
92e059d8 ILT |
153 | // the data. SH_TYPE is the section type: SHT_REL or SHT_RELA. |
154 | // RELOCATE implements operator() to do a relocation. | |
61ba1cf9 | 155 | |
92e059d8 | 156 | // PRELOCS points to the relocation data. RELOC_COUNT is the number |
730cdc88 ILT |
157 | // of relocs. OUTPUT_SECTION is the output section. |
158 | // NEEDS_SPECIAL_OFFSET_HANDLING is true if input offsets need to be | |
159 | // mapped to output offsets. | |
160 | ||
161 | // VIEW is the section data, VIEW_ADDRESS is its memory address, and | |
162 | // VIEW_SIZE is the size. These refer to the input section, unless | |
163 | // NEEDS_SPECIAL_OFFSET_HANDLING is true, in which case they refer to | |
164 | // the output section. | |
61ba1cf9 | 165 | |
ead1e424 ILT |
166 | template<int size, bool big_endian, typename Target_type, int sh_type, |
167 | typename Relocate> | |
61ba1cf9 ILT |
168 | inline void |
169 | relocate_section( | |
92e059d8 | 170 | const Relocate_info<size, big_endian>* relinfo, |
ead1e424 | 171 | Target_type* target, |
61ba1cf9 ILT |
172 | const unsigned char* prelocs, |
173 | size_t reloc_count, | |
730cdc88 ILT |
174 | Output_section* output_section, |
175 | bool needs_special_offset_handling, | |
61ba1cf9 ILT |
176 | unsigned char* view, |
177 | typename elfcpp::Elf_types<size>::Elf_Addr view_address, | |
fe8718a4 | 178 | section_size_type view_size) |
61ba1cf9 ILT |
179 | { |
180 | typedef typename Reloc_types<sh_type, size, big_endian>::Reloc Reltype; | |
181 | const int reloc_size = Reloc_types<sh_type, size, big_endian>::reloc_size; | |
182 | Relocate relocate; | |
183 | ||
730cdc88 ILT |
184 | Sized_relobj<size, big_endian>* object = relinfo->object; |
185 | unsigned int local_count = object->local_symbol_count(); | |
92e059d8 | 186 | |
e94cf127 CC |
187 | Comdat_behavior comdat_behavior = CB_UNDETERMINED; |
188 | ||
61ba1cf9 ILT |
189 | for (size_t i = 0; i < reloc_count; ++i, prelocs += reloc_size) |
190 | { | |
191 | Reltype reloc(prelocs); | |
192 | ||
fe8718a4 ILT |
193 | section_offset_type offset = |
194 | convert_to_section_size_type(reloc.get_r_offset()); | |
61ba1cf9 | 195 | |
730cdc88 ILT |
196 | if (needs_special_offset_handling) |
197 | { | |
198 | offset = output_section->output_offset(relinfo->object, | |
199 | relinfo->data_shndx, | |
200 | offset); | |
201 | if (offset == -1) | |
202 | continue; | |
203 | } | |
204 | ||
61ba1cf9 ILT |
205 | typename elfcpp::Elf_types<size>::Elf_WXword r_info = reloc.get_r_info(); |
206 | unsigned int r_sym = elfcpp::elf_r_sym<size>(r_info); | |
207 | unsigned int r_type = elfcpp::elf_r_type<size>(r_info); | |
208 | ||
c06b7b0b | 209 | const Sized_symbol<size>* sym; |
61ba1cf9 | 210 | |
b8e6aad9 ILT |
211 | Symbol_value<size> symval; |
212 | const Symbol_value<size> *psymval; | |
61ba1cf9 ILT |
213 | if (r_sym < local_count) |
214 | { | |
215 | sym = NULL; | |
730cdc88 | 216 | psymval = object->local_symbol(r_sym); |
e94cf127 CC |
217 | |
218 | // If the local symbol belongs to a section we are discarding, | |
219 | // and that section is a debug section, try to find the | |
220 | // corresponding kept section and map this symbol to its | |
221 | // counterpart in the kept section. | |
222 | bool is_ordinary; | |
223 | unsigned int shndx = psymval->input_shndx(&is_ordinary); | |
224 | if (is_ordinary | |
225 | && shndx != elfcpp::SHN_UNDEF | |
226 | && !object->is_section_included(shndx)) | |
227 | { | |
228 | if (comdat_behavior == CB_UNDETERMINED) | |
229 | { | |
4418b2d5 CC |
230 | std::string name = object->section_name(relinfo->data_shndx); |
231 | comdat_behavior = get_comdat_behavior(name.c_str()); | |
e94cf127 CC |
232 | } |
233 | if (comdat_behavior == CB_PRETEND) | |
234 | { | |
235 | bool found; | |
236 | typename elfcpp::Elf_types<size>::Elf_Addr value = | |
237 | object->map_to_kept_section(shndx, &found); | |
238 | if (found) | |
239 | symval.set_output_value(value + psymval->input_value()); | |
240 | else | |
241 | symval.set_output_value(0); | |
242 | } | |
243 | else | |
244 | { | |
245 | if (comdat_behavior == CB_WARNING) | |
246 | gold_warning_at_location(relinfo, i, offset, | |
247 | _("Relocation refers to discarded " | |
248 | "comdat section")); | |
249 | symval.set_output_value(0); | |
250 | } | |
251 | symval.set_no_output_symtab_entry(); | |
252 | psymval = &symval; | |
253 | } | |
61ba1cf9 ILT |
254 | } |
255 | else | |
256 | { | |
730cdc88 | 257 | const Symbol* gsym = object->global_symbol(r_sym); |
a3ad94ed | 258 | gold_assert(gsym != NULL); |
61ba1cf9 | 259 | if (gsym->is_forwarder()) |
92e059d8 | 260 | gsym = relinfo->symtab->resolve_forwards(gsym); |
61ba1cf9 | 261 | |
c06b7b0b | 262 | sym = static_cast<const Sized_symbol<size>*>(gsym); |
b8e6aad9 ILT |
263 | if (sym->has_symtab_index()) |
264 | symval.set_output_symtab_index(sym->symtab_index()); | |
265 | else | |
266 | symval.set_no_output_symtab_entry(); | |
267 | symval.set_output_value(sym->value()); | |
268 | psymval = &symval; | |
ead1e424 | 269 | } |
61ba1cf9 | 270 | |
b8e6aad9 | 271 | if (!relocate.relocate(relinfo, target, i, reloc, r_type, sym, psymval, |
ead1e424 ILT |
272 | view + offset, view_address + offset, view_size)) |
273 | continue; | |
274 | ||
fe8718a4 | 275 | if (offset < 0 || static_cast<section_size_type>(offset) >= view_size) |
ead1e424 | 276 | { |
75f2446e ILT |
277 | gold_error_at_location(relinfo, i, offset, |
278 | _("reloc has bad offset %zu"), | |
279 | static_cast<size_t>(offset)); | |
280 | continue; | |
61ba1cf9 ILT |
281 | } |
282 | ||
ead1e424 ILT |
283 | if (sym != NULL |
284 | && sym->is_undefined() | |
436ca963 | 285 | && sym->binding() != elfcpp::STB_WEAK |
9c2d0ef9 | 286 | && !target->is_defined_by_abi(sym) |
eb42429a ILT |
287 | && (!parameters->options().shared() // -shared |
288 | || parameters->options().defs())) // -z defs | |
75f2446e | 289 | gold_undefined_symbol(sym, relinfo, i, offset); |
f6ce93d6 ILT |
290 | |
291 | if (sym != NULL && sym->has_warning()) | |
75f2446e | 292 | relinfo->symtab->issue_warning(sym, relinfo, i, offset); |
61ba1cf9 ILT |
293 | } |
294 | } | |
295 | ||
6a74a719 ILT |
296 | // This class may be used as a typical class for the |
297 | // Scan_relocatable_reloc parameter to scan_relocatable_relocs. The | |
298 | // template parameter Classify_reloc must be a class type which | |
299 | // provides a function get_size_for_reloc which returns the number of | |
300 | // bytes to which a reloc applies. This class is intended to capture | |
301 | // the most typical target behaviour, while still permitting targets | |
302 | // to define their own independent class for Scan_relocatable_reloc. | |
303 | ||
304 | template<int sh_type, typename Classify_reloc> | |
305 | class Default_scan_relocatable_relocs | |
306 | { | |
307 | public: | |
308 | // Return the strategy to use for a local symbol which is not a | |
309 | // section symbol, given the relocation type. | |
310 | inline Relocatable_relocs::Reloc_strategy | |
311 | local_non_section_strategy(unsigned int, Relobj*) | |
312 | { return Relocatable_relocs::RELOC_COPY; } | |
313 | ||
314 | // Return the strategy to use for a local symbol which is a section | |
315 | // symbol, given the relocation type. | |
316 | inline Relocatable_relocs::Reloc_strategy | |
317 | local_section_strategy(unsigned int r_type, Relobj* object) | |
318 | { | |
319 | if (sh_type == elfcpp::SHT_RELA) | |
320 | return Relocatable_relocs::RELOC_ADJUST_FOR_SECTION_RELA; | |
321 | else | |
322 | { | |
323 | Classify_reloc classify; | |
324 | switch (classify.get_size_for_reloc(r_type, object)) | |
325 | { | |
326 | case 0: | |
7019cd25 | 327 | return Relocatable_relocs::RELOC_ADJUST_FOR_SECTION_0; |
6a74a719 ILT |
328 | case 1: |
329 | return Relocatable_relocs::RELOC_ADJUST_FOR_SECTION_1; | |
330 | case 2: | |
331 | return Relocatable_relocs::RELOC_ADJUST_FOR_SECTION_2; | |
332 | case 4: | |
333 | return Relocatable_relocs::RELOC_ADJUST_FOR_SECTION_4; | |
334 | case 8: | |
335 | return Relocatable_relocs::RELOC_ADJUST_FOR_SECTION_8; | |
336 | default: | |
337 | gold_unreachable(); | |
338 | } | |
339 | } | |
340 | } | |
341 | ||
342 | // Return the strategy to use for a global symbol, given the | |
343 | // relocation type, the object, and the symbol index. | |
344 | inline Relocatable_relocs::Reloc_strategy | |
345 | global_strategy(unsigned int, Relobj*, unsigned int) | |
346 | { return Relocatable_relocs::RELOC_COPY; } | |
347 | }; | |
348 | ||
349 | // Scan relocs during a relocatable link. This is a default | |
350 | // definition which should work for most targets. | |
351 | // Scan_relocatable_reloc must name a class type which provides three | |
352 | // functions which return a Relocatable_relocs::Reloc_strategy code: | |
353 | // global_strategy, local_non_section_strategy, and | |
354 | // local_section_strategy. Most targets should be able to use | |
355 | // Default_scan_relocatable_relocs as this class. | |
356 | ||
7019cd25 | 357 | template<int size, bool big_endian, int sh_type, |
6a74a719 ILT |
358 | typename Scan_relocatable_reloc> |
359 | void | |
360 | scan_relocatable_relocs( | |
361 | const General_options&, | |
362 | Symbol_table*, | |
363 | Layout*, | |
364 | Sized_relobj<size, big_endian>* object, | |
365 | unsigned int data_shndx, | |
366 | const unsigned char* prelocs, | |
367 | size_t reloc_count, | |
368 | Output_section* output_section, | |
369 | bool needs_special_offset_handling, | |
370 | size_t local_symbol_count, | |
371 | const unsigned char* plocal_syms, | |
372 | Relocatable_relocs* rr) | |
373 | { | |
374 | typedef typename Reloc_types<sh_type, size, big_endian>::Reloc Reltype; | |
375 | const int reloc_size = Reloc_types<sh_type, size, big_endian>::reloc_size; | |
376 | const int sym_size = elfcpp::Elf_sizes<size>::sym_size; | |
377 | Scan_relocatable_reloc scan; | |
378 | ||
379 | for (size_t i = 0; i < reloc_count; ++i, prelocs += reloc_size) | |
380 | { | |
381 | Reltype reloc(prelocs); | |
382 | ||
383 | Relocatable_relocs::Reloc_strategy strategy; | |
384 | ||
385 | if (needs_special_offset_handling | |
386 | && !output_section->is_input_address_mapped(object, data_shndx, | |
387 | reloc.get_r_offset())) | |
388 | strategy = Relocatable_relocs::RELOC_DISCARD; | |
389 | else | |
390 | { | |
391 | typename elfcpp::Elf_types<size>::Elf_WXword r_info = | |
392 | reloc.get_r_info(); | |
393 | const unsigned int r_sym = elfcpp::elf_r_sym<size>(r_info); | |
394 | const unsigned int r_type = elfcpp::elf_r_type<size>(r_info); | |
395 | ||
396 | if (r_sym >= local_symbol_count) | |
397 | strategy = scan.global_strategy(r_type, object, r_sym); | |
398 | else | |
399 | { | |
400 | gold_assert(plocal_syms != NULL); | |
401 | typename elfcpp::Sym<size, big_endian> lsym(plocal_syms | |
402 | + r_sym * sym_size); | |
d491d34e ILT |
403 | unsigned int shndx = lsym.get_st_shndx(); |
404 | bool is_ordinary; | |
405 | shndx = object->adjust_sym_shndx(r_sym, shndx, &is_ordinary); | |
406 | if (is_ordinary | |
6a74a719 | 407 | && shndx != elfcpp::SHN_UNDEF |
d491d34e | 408 | && !object->is_section_included(shndx)) |
6a74a719 ILT |
409 | { |
410 | // RELOC is a relocation against a local symbol | |
411 | // defined in a section we are discarding. Discard | |
412 | // the reloc. FIXME: Should we issue a warning? | |
413 | strategy = Relocatable_relocs::RELOC_DISCARD; | |
414 | } | |
415 | else if (lsym.get_st_type() != elfcpp::STT_SECTION) | |
416 | strategy = scan.local_non_section_strategy(r_type, object); | |
417 | else | |
418 | { | |
419 | strategy = scan.local_section_strategy(r_type, object); | |
420 | if (strategy != Relocatable_relocs::RELOC_DISCARD) | |
ef9beddf | 421 | object->output_section(shndx)->set_needs_symtab_index(); |
6a74a719 ILT |
422 | } |
423 | } | |
424 | } | |
425 | ||
426 | rr->set_next_reloc_strategy(strategy); | |
427 | } | |
428 | } | |
429 | ||
430 | // Relocate relocs during a relocatable link. This is a default | |
431 | // definition which should work for most targets. | |
432 | ||
7019cd25 | 433 | template<int size, bool big_endian, int sh_type> |
6a74a719 ILT |
434 | void |
435 | relocate_for_relocatable( | |
436 | const Relocate_info<size, big_endian>* relinfo, | |
437 | const unsigned char* prelocs, | |
438 | size_t reloc_count, | |
439 | Output_section* output_section, | |
ef9beddf | 440 | typename elfcpp::Elf_types<size>::Elf_Addr offset_in_output_section, |
6a74a719 ILT |
441 | const Relocatable_relocs* rr, |
442 | unsigned char* view, | |
6be6f3bd | 443 | typename elfcpp::Elf_types<size>::Elf_Addr view_address, |
6a74a719 ILT |
444 | section_size_type, |
445 | unsigned char* reloc_view, | |
446 | section_size_type reloc_view_size) | |
447 | { | |
ef9beddf | 448 | typedef typename elfcpp::Elf_types<size>::Elf_Addr Address; |
6a74a719 ILT |
449 | typedef typename Reloc_types<sh_type, size, big_endian>::Reloc Reltype; |
450 | typedef typename Reloc_types<sh_type, size, big_endian>::Reloc_write | |
451 | Reltype_write; | |
452 | const int reloc_size = Reloc_types<sh_type, size, big_endian>::reloc_size; | |
453 | ||
454 | Sized_relobj<size, big_endian>* const object = relinfo->object; | |
455 | const unsigned int local_count = object->local_symbol_count(); | |
456 | ||
457 | unsigned char* pwrite = reloc_view; | |
458 | ||
459 | for (size_t i = 0; i < reloc_count; ++i, prelocs += reloc_size) | |
460 | { | |
461 | Relocatable_relocs::Reloc_strategy strategy = rr->strategy(i); | |
462 | if (strategy == Relocatable_relocs::RELOC_DISCARD) | |
463 | continue; | |
464 | ||
465 | Reltype reloc(prelocs); | |
466 | Reltype_write reloc_write(pwrite); | |
467 | ||
468 | typename elfcpp::Elf_types<size>::Elf_WXword r_info = reloc.get_r_info(); | |
469 | const unsigned int r_sym = elfcpp::elf_r_sym<size>(r_info); | |
470 | const unsigned int r_type = elfcpp::elf_r_type<size>(r_info); | |
471 | ||
472 | // Get the new symbol index. | |
473 | ||
474 | unsigned int new_symndx; | |
475 | if (r_sym < local_count) | |
476 | { | |
477 | switch (strategy) | |
478 | { | |
479 | case Relocatable_relocs::RELOC_COPY: | |
480 | new_symndx = object->symtab_index(r_sym); | |
481 | gold_assert(new_symndx != -1U); | |
482 | break; | |
483 | ||
484 | case Relocatable_relocs::RELOC_ADJUST_FOR_SECTION_RELA: | |
7019cd25 | 485 | case Relocatable_relocs::RELOC_ADJUST_FOR_SECTION_0: |
6a74a719 ILT |
486 | case Relocatable_relocs::RELOC_ADJUST_FOR_SECTION_1: |
487 | case Relocatable_relocs::RELOC_ADJUST_FOR_SECTION_2: | |
488 | case Relocatable_relocs::RELOC_ADJUST_FOR_SECTION_4: | |
489 | case Relocatable_relocs::RELOC_ADJUST_FOR_SECTION_8: | |
490 | { | |
491 | // We are adjusting a section symbol. We need to find | |
492 | // the symbol table index of the section symbol for | |
493 | // the output section corresponding to input section | |
494 | // in which this symbol is defined. | |
495 | gold_assert(r_sym < local_count); | |
d491d34e ILT |
496 | bool is_ordinary; |
497 | unsigned int shndx = | |
498 | object->local_symbol_input_shndx(r_sym, &is_ordinary); | |
499 | gold_assert(is_ordinary); | |
ef9beddf | 500 | Output_section* os = object->output_section(shndx); |
6a74a719 ILT |
501 | gold_assert(os != NULL); |
502 | gold_assert(os->needs_symtab_index()); | |
503 | new_symndx = os->symtab_index(); | |
504 | } | |
505 | break; | |
506 | ||
507 | default: | |
508 | gold_unreachable(); | |
509 | } | |
510 | } | |
511 | else | |
512 | { | |
513 | const Symbol* gsym = object->global_symbol(r_sym); | |
514 | gold_assert(gsym != NULL); | |
515 | if (gsym->is_forwarder()) | |
516 | gsym = relinfo->symtab->resolve_forwards(gsym); | |
517 | ||
518 | gold_assert(gsym->has_symtab_index()); | |
519 | new_symndx = gsym->symtab_index(); | |
520 | } | |
521 | ||
522 | // Get the new offset--the location in the output section where | |
523 | // this relocation should be applied. | |
524 | ||
ef9beddf ILT |
525 | Address offset = reloc.get_r_offset(); |
526 | Address new_offset; | |
527 | if (offset_in_output_section != -1U) | |
6a74a719 ILT |
528 | new_offset = offset + offset_in_output_section; |
529 | else | |
530 | { | |
ef9beddf ILT |
531 | section_offset_type sot_offset = |
532 | convert_types<section_offset_type, Address>(offset); | |
533 | section_offset_type new_sot_offset = | |
534 | output_section->output_offset(object, relinfo->data_shndx, | |
535 | sot_offset); | |
536 | gold_assert(new_sot_offset != -1); | |
537 | new_offset = new_sot_offset; | |
6a74a719 ILT |
538 | } |
539 | ||
6be6f3bd ILT |
540 | // In an object file, r_offset is an offset within the section. |
541 | // In an executable or dynamic object, generated by | |
542 | // --emit-relocs, r_offset is an absolute address. | |
543 | if (!parameters->options().relocatable()) | |
e09ad04a ILT |
544 | { |
545 | new_offset += view_address; | |
ef9beddf | 546 | if (offset_in_output_section != -1U) |
e09ad04a ILT |
547 | new_offset -= offset_in_output_section; |
548 | } | |
6be6f3bd | 549 | |
6a74a719 ILT |
550 | reloc_write.put_r_offset(new_offset); |
551 | reloc_write.put_r_info(elfcpp::elf_r_info<size>(new_symndx, r_type)); | |
552 | ||
553 | // Handle the reloc addend based on the strategy. | |
554 | ||
555 | if (strategy == Relocatable_relocs::RELOC_COPY) | |
556 | { | |
557 | if (sh_type == elfcpp::SHT_RELA) | |
558 | Reloc_types<sh_type, size, big_endian>:: | |
559 | copy_reloc_addend(&reloc_write, | |
560 | &reloc); | |
561 | } | |
562 | else | |
563 | { | |
564 | // The relocation uses a section symbol in the input file. | |
565 | // We are adjusting it to use a section symbol in the output | |
566 | // file. The input section symbol refers to some address in | |
567 | // the input section. We need the relocation in the output | |
568 | // file to refer to that same address. This adjustment to | |
569 | // the addend is the same calculation we use for a simple | |
570 | // absolute relocation for the input section symbol. | |
571 | ||
572 | const Symbol_value<size>* psymval = object->local_symbol(r_sym); | |
573 | ||
574 | unsigned char* padd = view + offset; | |
575 | switch (strategy) | |
576 | { | |
577 | case Relocatable_relocs::RELOC_ADJUST_FOR_SECTION_RELA: | |
578 | { | |
579 | typename elfcpp::Elf_types<size>::Elf_Swxword addend; | |
580 | addend = Reloc_types<sh_type, size, big_endian>:: | |
581 | get_reloc_addend(&reloc); | |
582 | addend = psymval->value(object, addend); | |
583 | Reloc_types<sh_type, size, big_endian>:: | |
584 | set_reloc_addend(&reloc_write, addend); | |
585 | } | |
586 | break; | |
587 | ||
7019cd25 ILT |
588 | case Relocatable_relocs::RELOC_ADJUST_FOR_SECTION_0: |
589 | break; | |
590 | ||
6a74a719 ILT |
591 | case Relocatable_relocs::RELOC_ADJUST_FOR_SECTION_1: |
592 | Relocate_functions<size, big_endian>::rel8(padd, object, | |
593 | psymval); | |
594 | break; | |
595 | ||
596 | case Relocatable_relocs::RELOC_ADJUST_FOR_SECTION_2: | |
597 | Relocate_functions<size, big_endian>::rel16(padd, object, | |
598 | psymval); | |
599 | break; | |
600 | ||
601 | case Relocatable_relocs::RELOC_ADJUST_FOR_SECTION_4: | |
602 | Relocate_functions<size, big_endian>::rel32(padd, object, | |
603 | psymval); | |
604 | break; | |
605 | ||
606 | case Relocatable_relocs::RELOC_ADJUST_FOR_SECTION_8: | |
607 | Relocate_functions<size, big_endian>::rel64(padd, object, | |
608 | psymval); | |
609 | break; | |
610 | ||
611 | default: | |
612 | gold_unreachable(); | |
613 | } | |
614 | } | |
615 | ||
616 | pwrite += reloc_size; | |
617 | } | |
618 | ||
619 | gold_assert(static_cast<section_size_type>(pwrite - reloc_view) | |
620 | == reloc_view_size); | |
621 | } | |
622 | ||
61ba1cf9 ILT |
623 | } // End namespace gold. |
624 | ||
625 | #endif // !defined(GOLD_TARGET_RELOC_H) |