Commit | Line | Data |
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59d23ada | 1 | /* Motorola MCore specific support for 32-bit ELF |
252b5132 RH |
2 | Copyright 1994, 1995, 1999 Free Software Foundation, Inc. |
3 | ||
4 | This file is part of BFD, the Binary File Descriptor library. | |
5 | ||
6 | This program is free software; you can redistribute it and/or modify | |
7 | it under the terms of the GNU General Public License as published by | |
8 | the Free Software Foundation; either version 2 of the License, or | |
9 | (at your option) any later version. | |
10 | ||
11 | This program is distributed in the hope that it will be useful, | |
12 | but WITHOUT ANY WARRANTY; without even the implied warranty of | |
13 | MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the | |
14 | GNU General Public License for more details. | |
15 | ||
16 | You should have received a copy of the GNU General Public License | |
17 | along with this program; if not, write to the Free Software | |
18 | Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA. */ | |
19 | ||
20 | /* This file is based on a preliminary RCE ELF ABI. The | |
21 | information may not match the final RCE ELF ABI. */ | |
22 | ||
23 | #include "bfd.h" | |
24 | #include "sysdep.h" | |
25 | #include "bfdlink.h" | |
26 | #include "libbfd.h" | |
27 | #include "elf-bfd.h" | |
28 | #include "elf/mcore.h" | |
29 | #include <assert.h> | |
30 | ||
31 | #define USE_RELA /* Only USE_REL is actually significant, but this is | |
32 | here are a reminder... */ | |
33 | ||
34 | static void mcore_elf_howto_init | |
35 | PARAMS ((void)); | |
36 | static reloc_howto_type * mcore_elf_reloc_type_lookup | |
37 | PARAMS ((bfd *, bfd_reloc_code_real_type)); | |
38 | static void mcore_elf_info_to_howto | |
39 | PARAMS ((bfd *, arelent *, Elf32_Internal_Rela *)); | |
40 | static boolean mcore_elf_set_private_flags | |
41 | PARAMS ((bfd *, flagword)); | |
42 | static boolean mcore_elf_copy_private_bfd_data | |
43 | PARAMS ((bfd *, bfd *)); | |
44 | static boolean mcore_elf_merge_private_bfd_data | |
45 | PARAMS ((bfd *, bfd *)); | |
46 | static bfd_reloc_status_type mcore_elf_unsupported_reloc | |
47 | PARAMS ((bfd *, arelent *, asymbol *, PTR, asection *, bfd *, char **)); | |
48 | static boolean mcore_elf_relocate_section | |
49 | PARAMS ((bfd *, struct bfd_link_info *, bfd *, asection *, bfd_byte *, | |
50 | Elf_Internal_Rela *, Elf_Internal_Sym *, asection **)); | |
51 | ||
52 | static reloc_howto_type * mcore_elf_howto_table [(int) R_MCORE_max]; | |
53 | ||
54 | static reloc_howto_type mcore_elf_howto_raw[] = | |
55 | { | |
56 | /* This reloc does nothing. */ | |
57 | HOWTO (R_MCORE_NONE, /* type */ | |
58 | 0, /* rightshift */ | |
59 | 2, /* size (0 = byte, 1 = short, 2 = long) */ | |
59d23ada NC |
60 | 32, /* bitsize */ |
61 | false, /* pc_relative */ | |
252b5132 RH |
62 | 0, /* bitpos */ |
63 | complain_overflow_bitfield, /* complain_on_overflow */ | |
59d23ada | 64 | NULL, /* special_function */ |
252b5132 RH |
65 | "R_MCORE_NONE", /* name */ |
66 | false, /* partial_inplace */ | |
67 | 0, /* src_mask */ | |
68 | 0, /* dst_mask */ | |
59d23ada | 69 | false), /* pcrel_offset */ |
252b5132 RH |
70 | |
71 | /* A standard 32 bit relocation. */ | |
72 | HOWTO (R_MCORE_ADDR32, /* type */ | |
73 | 0, /* rightshift */ | |
74 | 2, /* size (0 = byte, 1 = short, 2 = long) */ | |
75 | 32, /* bitsize */ | |
76 | false, /* pc_relative */ | |
77 | 0, /* bitpos */ | |
78 | complain_overflow_bitfield, /* complain_on_overflow */ | |
79 | bfd_elf_generic_reloc, /* special_function */ | |
80 | "ADDR32", /* name *//* For compatability with coff/pe port. */ | |
81 | false, /* partial_inplace */ | |
82 | 0x0, /* src_mask */ | |
83 | 0xffffffff, /* dst_mask */ | |
84 | false), /* pcrel_offset */ | |
85 | ||
86 | /* 8 bits + 2 zero bits; jmpi/jsri/lrw instructions. | |
87 | Should not appear in object files. */ | |
88 | HOWTO (R_MCORE_PCRELIMM8BY4, /* type */ | |
89 | 2, /* rightshift */ | |
90 | 1, /* size (0 = byte, 1 = short, 2 = long) */ | |
91 | 8, /* bitsize */ | |
92 | true, /* pc_relative */ | |
93 | 0, /* bitpos */ | |
94 | complain_overflow_bitfield, /* complain_on_overflow */ | |
95 | mcore_elf_unsupported_reloc, /* special_function */ | |
96 | "R_MCORE_PCRELIMM8BY4",/* name */ | |
97 | false, /* partial_inplace */ | |
98 | 0, /* src_mask */ | |
99 | 0, /* dst_mask */ | |
100 | true), /* pcrel_offset */ | |
101 | ||
102 | /* bsr/bt/bf/br instructions; 11 bits + 1 zero bit | |
103 | Span 2k instructions == 4k bytes. | |
104 | Only useful pieces at the relocated address are the opcode (5 bits) */ | |
105 | HOWTO (R_MCORE_PCRELIMM11BY2,/* type */ | |
106 | 1, /* rightshift */ | |
107 | 1, /* size (0 = byte, 1 = short, 2 = long) */ | |
108 | 11, /* bitsize */ | |
109 | true, /* pc_relative */ | |
110 | 0, /* bitpos */ | |
111 | complain_overflow_signed, /* complain_on_overflow */ | |
112 | bfd_elf_generic_reloc, /* special_function */ | |
113 | "R_MCORE_PCRELIMM11BY2",/* name */ | |
114 | false, /* partial_inplace */ | |
115 | 0x0, /* src_mask */ | |
116 | 0x7ff, /* dst_mask */ | |
117 | true), /* pcrel_offset */ | |
118 | ||
119 | /* 4 bits + 1 zero bit; 'loopt' instruction only; unsupported. */ | |
120 | HOWTO (R_MCORE_PCRELIMM4BY2, /* type */ | |
121 | 1, /* rightshift */ | |
122 | 1, /* size (0 = byte, 1 = short, 2 = long) */ | |
123 | 4, /* bitsize */ | |
124 | true, /* pc_relative */ | |
125 | 0, /* bitpos */ | |
126 | complain_overflow_bitfield, /* complain_on_overflow */ | |
127 | mcore_elf_unsupported_reloc,/* special_function */ | |
128 | "R_MCORE_PCRELIMM4BY2",/* name */ | |
129 | false, /* partial_inplace */ | |
130 | 0, /* src_mask */ | |
131 | 0, /* dst_mask */ | |
132 | true), /* pcrel_offset */ | |
133 | ||
134 | /* 32-bit pc-relative. Eventually this will help support PIC code. */ | |
135 | HOWTO (R_MCORE_PCREL32, /* type */ | |
136 | 0, /* rightshift */ | |
137 | 2, /* size (0 = byte, 1 = short, 2 = long) */ | |
138 | 32, /* bitsize */ | |
139 | true, /* pc_relative */ | |
140 | 0, /* bitpos */ | |
141 | complain_overflow_bitfield, /* complain_on_overflow */ | |
142 | bfd_elf_generic_reloc, /* special_function */ | |
143 | "R_MCORE_PCREL32", /* name */ | |
144 | false, /* partial_inplace */ | |
145 | 0x0, /* src_mask */ | |
146 | 0xffffffff, /* dst_mask */ | |
147 | true), /* pcrel_offset */ | |
148 | ||
149 | /* Like PCRELIMM11BY2, this relocation indicates that there is a | |
150 | 'jsri' at the specified address. There is a separate relocation | |
151 | entry for the literal pool entry that it references, but we | |
152 | might be able to change the jsri to a bsr if the target turns out | |
153 | to be close enough [even though we won't reclaim the literal pool | |
154 | entry, we'll get some runtime efficiency back]. Note that this | |
155 | is a relocation that we are allowed to safely ignore. */ | |
156 | HOWTO (R_MCORE_PCRELJSR_IMM11BY2,/* type */ | |
157 | 1, /* rightshift */ | |
158 | 1, /* size (0 = byte, 1 = short, 2 = long) */ | |
159 | 11, /* bitsize */ | |
160 | true, /* pc_relative */ | |
161 | 0, /* bitpos */ | |
162 | complain_overflow_signed, /* complain_on_overflow */ | |
163 | bfd_elf_generic_reloc, /* special_function */ | |
164 | "R_MCORE_PCRELJSR_IMM11BY2", /* name */ | |
165 | false, /* partial_inplace */ | |
166 | 0x0, /* src_mask */ | |
167 | 0x7ff, /* dst_mask */ | |
168 | true), /* pcrel_offset */ | |
169 | ||
170 | /* GNU extension to record C++ vtable hierarchy */ | |
171 | HOWTO (R_MCORE_GNU_VTINHERIT, /* type */ | |
172 | 0, /* rightshift */ | |
173 | 2, /* size (0 = byte, 1 = short, 2 = long) */ | |
174 | 0, /* bitsize */ | |
175 | false, /* pc_relative */ | |
176 | 0, /* bitpos */ | |
177 | complain_overflow_dont, /* complain_on_overflow */ | |
178 | NULL, /* special_function */ | |
179 | "R_MCORE_GNU_VTINHERIT", /* name */ | |
180 | false, /* partial_inplace */ | |
181 | 0, /* src_mask */ | |
182 | 0, /* dst_mask */ | |
183 | false), /* pcrel_offset */ | |
184 | ||
185 | /* GNU extension to record C++ vtable member usage */ | |
186 | HOWTO (R_MCORE_GNU_VTENTRY, /* type */ | |
187 | 0, /* rightshift */ | |
188 | 2, /* size (0 = byte, 1 = short, 2 = long) */ | |
189 | 0, /* bitsize */ | |
190 | false, /* pc_relative */ | |
191 | 0, /* bitpos */ | |
192 | complain_overflow_dont,/* complain_on_overflow */ | |
193 | _bfd_elf_rel_vtable_reloc_fn, /* special_function */ | |
194 | "R_MCORE_GNU_VTENTRY", /* name */ | |
195 | false, /* partial_inplace */ | |
196 | 0, /* src_mask */ | |
197 | 0, /* dst_mask */ | |
198 | false), /* pcrel_offset */ | |
36797d47 NC |
199 | |
200 | HOWTO (R_MCORE_RELATIVE, /* type */ | |
201 | 0, /* rightshift */ | |
202 | 2, /* size (0 = byte, 1 = short, 2 = long) */ | |
203 | 32, /* bitsize */ | |
204 | false, /* pc_relative */ | |
205 | 0, /* bitpos */ | |
206 | complain_overflow_signed, /* complain_on_overflow */ | |
207 | NULL, /* special_function */ | |
208 | "R_MCORE_RELATIVE", /* name */ | |
209 | true, /* partial_inplace */ | |
210 | 0xffffffff, /* src_mask */ | |
211 | 0xffffffff, /* dst_mask */ | |
59d23ada | 212 | false) /* pcrel_offset */ |
252b5132 RH |
213 | }; |
214 | ||
215 | #ifndef NUM_ELEM | |
216 | #define NUM_ELEM(a) (sizeof (a) / sizeof (a)[0]) | |
217 | #endif | |
218 | \f | |
219 | /* Initialize the mcore_elf_howto_table, so that linear accesses can be done. */ | |
220 | static void | |
221 | mcore_elf_howto_init () | |
222 | { | |
223 | unsigned int i; | |
224 | ||
225 | for (i = NUM_ELEM (mcore_elf_howto_raw); i--;) | |
226 | { | |
227 | unsigned int type; | |
228 | ||
229 | type = mcore_elf_howto_raw[i].type; | |
230 | ||
231 | BFD_ASSERT (type < NUM_ELEM (mcore_elf_howto_table)); | |
232 | ||
233 | mcore_elf_howto_table [type] = & mcore_elf_howto_raw [i]; | |
234 | } | |
235 | } | |
236 | ||
237 | \f | |
238 | static reloc_howto_type * | |
239 | mcore_elf_reloc_type_lookup (abfd, code) | |
5f771d47 | 240 | bfd * abfd ATTRIBUTE_UNUSED; |
252b5132 RH |
241 | bfd_reloc_code_real_type code; |
242 | { | |
243 | enum elf_mcore_reloc_type mcore_reloc = R_MCORE_NONE; | |
244 | ||
245 | switch (code) | |
246 | { | |
247 | case BFD_RELOC_NONE: mcore_reloc = R_MCORE_NONE; break; | |
248 | case BFD_RELOC_32: mcore_reloc = R_MCORE_ADDR32; break; | |
249 | case BFD_RELOC_MCORE_PCREL_IMM8BY4: mcore_reloc = R_MCORE_PCRELIMM8BY4; break; | |
250 | case BFD_RELOC_MCORE_PCREL_IMM11BY2: mcore_reloc = R_MCORE_PCRELIMM11BY2; break; | |
251 | case BFD_RELOC_MCORE_PCREL_IMM4BY2: mcore_reloc = R_MCORE_PCRELIMM4BY2; break; | |
252 | case BFD_RELOC_32_PCREL: mcore_reloc = R_MCORE_PCREL32; break; | |
253 | case BFD_RELOC_MCORE_PCREL_JSR_IMM11BY2: mcore_reloc = R_MCORE_PCRELJSR_IMM11BY2; break; | |
254 | case BFD_RELOC_VTABLE_INHERIT: mcore_reloc = R_MCORE_GNU_VTINHERIT; break; | |
255 | case BFD_RELOC_VTABLE_ENTRY: mcore_reloc = R_MCORE_GNU_VTENTRY; break; | |
36797d47 | 256 | case BFD_RELOC_RVA: mcore_reloc = R_MCORE_RELATIVE; break; |
252b5132 RH |
257 | default: |
258 | return (reloc_howto_type *)NULL; | |
259 | } | |
260 | ||
261 | if (! mcore_elf_howto_table [R_MCORE_PCRELIMM8BY4]) /* Initialize howto table if needed */ | |
262 | mcore_elf_howto_init (); | |
263 | ||
264 | return mcore_elf_howto_table [(int) mcore_reloc]; | |
265 | }; | |
266 | ||
267 | /* Set the howto pointer for a RCE ELF reloc. */ | |
268 | static void | |
269 | mcore_elf_info_to_howto (abfd, cache_ptr, dst) | |
5f771d47 | 270 | bfd * abfd ATTRIBUTE_UNUSED; |
252b5132 RH |
271 | arelent * cache_ptr; |
272 | Elf32_Internal_Rela * dst; | |
273 | { | |
274 | if (! mcore_elf_howto_table [R_MCORE_PCRELIMM8BY4]) /* Initialize howto table if needed */ | |
275 | mcore_elf_howto_init (); | |
276 | ||
277 | BFD_ASSERT (ELF32_R_TYPE (dst->r_info) < (unsigned int) R_MCORE_max); | |
278 | ||
279 | cache_ptr->howto = mcore_elf_howto_table [ELF32_R_TYPE (dst->r_info)]; | |
280 | } | |
281 | ||
282 | /* Function to set whether a module needs the -mrelocatable bit set. */ | |
283 | static boolean | |
284 | mcore_elf_set_private_flags (abfd, flags) | |
285 | bfd * abfd; | |
286 | flagword flags; | |
287 | { | |
288 | BFD_ASSERT (! elf_flags_init (abfd) | |
289 | || elf_elfheader (abfd)->e_flags == flags); | |
290 | ||
291 | elf_elfheader (abfd)->e_flags = flags; | |
292 | elf_flags_init (abfd) = true; | |
293 | return true; | |
294 | } | |
295 | ||
296 | /* Copy backend specific data from one object module to another. */ | |
297 | static boolean | |
298 | mcore_elf_copy_private_bfd_data (ibfd, obfd) | |
299 | bfd * ibfd; | |
300 | bfd * obfd; | |
301 | { | |
302 | if ( bfd_get_flavour (ibfd) != bfd_target_elf_flavour | |
303 | || bfd_get_flavour (obfd) != bfd_target_elf_flavour) | |
304 | return true; | |
305 | ||
306 | BFD_ASSERT (! elf_flags_init (obfd) | |
307 | || elf_elfheader (obfd)->e_flags == elf_elfheader (ibfd)->e_flags); | |
308 | ||
309 | elf_elfheader (obfd)->e_flags = elf_elfheader (ibfd)->e_flags; | |
310 | elf_flags_init (obfd) = true; | |
311 | return true; | |
312 | } | |
313 | ||
314 | /* Merge backend specific data from an object file to the output | |
315 | object file when linking. */ | |
316 | static boolean | |
317 | mcore_elf_merge_private_bfd_data (ibfd, obfd) | |
318 | bfd * ibfd; | |
319 | bfd * obfd; | |
320 | { | |
321 | flagword old_flags; | |
322 | flagword new_flags; | |
252b5132 RH |
323 | |
324 | /* Check if we have the same endianess */ | |
325 | if ( ibfd->xvec->byteorder != obfd->xvec->byteorder | |
326 | && obfd->xvec->byteorder != BFD_ENDIAN_UNKNOWN) | |
327 | { | |
328 | (*_bfd_error_handler) | |
329 | (_("%s: compiled for a %s endian system and target is %s endian.\n"), | |
330 | bfd_get_filename (ibfd), | |
331 | bfd_big_endian (ibfd) ? "big" : "little", | |
332 | bfd_big_endian (obfd) ? "big" : "little"); | |
333 | ||
334 | bfd_set_error (bfd_error_wrong_format); | |
335 | return false; | |
336 | } | |
337 | ||
338 | if ( bfd_get_flavour (ibfd) != bfd_target_elf_flavour | |
339 | || bfd_get_flavour (obfd) != bfd_target_elf_flavour) | |
340 | return true; | |
341 | ||
342 | new_flags = elf_elfheader (ibfd)->e_flags; | |
343 | old_flags = elf_elfheader (obfd)->e_flags; | |
344 | ||
345 | if (! elf_flags_init (obfd)) /* First call, no flags set */ | |
346 | { | |
347 | elf_flags_init (obfd) = true; | |
348 | elf_elfheader (obfd)->e_flags = new_flags; | |
349 | } | |
350 | else if (new_flags == old_flags) /* Compatible flags are ok */ | |
351 | ; | |
5f771d47 ILT |
352 | else |
353 | { | |
354 | /* FIXME */ | |
355 | } | |
356 | ||
252b5132 RH |
357 | return true; |
358 | } | |
359 | ||
360 | \f | |
361 | /* Don't pretend we can deal with unsupported relocs. */ | |
362 | ||
363 | /*ARGSUSED*/ | |
364 | static bfd_reloc_status_type | |
365 | mcore_elf_unsupported_reloc (abfd, reloc_entry, symbol, data, input_section, | |
366 | output_bfd, error_message) | |
367 | bfd * abfd; | |
368 | arelent * reloc_entry; | |
5f771d47 ILT |
369 | asymbol * symbol ATTRIBUTE_UNUSED; |
370 | PTR data ATTRIBUTE_UNUSED; | |
371 | asection * input_section ATTRIBUTE_UNUSED; | |
372 | bfd * output_bfd ATTRIBUTE_UNUSED; | |
373 | char ** error_message ATTRIBUTE_UNUSED; | |
252b5132 RH |
374 | { |
375 | BFD_ASSERT (reloc_entry->howto != (reloc_howto_type *)0); | |
376 | ||
377 | _bfd_error_handler (_("%s: Relocation %s (%d) is not currently supported.\n"), | |
378 | bfd_get_filename (abfd), | |
379 | reloc_entry->howto->name, | |
380 | reloc_entry->howto->type); | |
381 | ||
382 | return bfd_reloc_notsupported; | |
383 | } | |
384 | ||
385 | \f | |
386 | /* The RELOCATE_SECTION function is called by the ELF backend linker | |
387 | to handle the relocations for a section. | |
388 | ||
389 | The relocs are always passed as Rela structures; if the section | |
390 | actually uses Rel structures, the r_addend field will always be | |
391 | zero. | |
392 | ||
393 | This function is responsible for adjust the section contents as | |
394 | necessary, and (if using Rela relocs and generating a | |
395 | relocateable output file) adjusting the reloc addend as | |
396 | necessary. | |
397 | ||
398 | This function does not have to worry about setting the reloc | |
399 | address or the reloc symbol index. | |
400 | ||
401 | LOCAL_SYMS is a pointer to the swapped in local symbols. | |
402 | ||
403 | LOCAL_SECTIONS is an array giving the section in the input file | |
404 | corresponding to the st_shndx field of each local symbol. | |
405 | ||
406 | The global hash table entry for the global symbols can be found | |
407 | via elf_sym_hashes (input_bfd). | |
408 | ||
409 | When generating relocateable output, this function must handle | |
410 | STB_LOCAL/STT_SECTION symbols specially. The output symbol is | |
411 | going to be the section symbol corresponding to the output | |
412 | section, which means that the addend must be adjusted | |
413 | accordingly. */ | |
414 | ||
415 | static boolean | |
416 | mcore_elf_relocate_section (output_bfd, info, input_bfd, input_section, | |
417 | contents, relocs, local_syms, local_sections) | |
5f771d47 | 418 | bfd * output_bfd ATTRIBUTE_UNUSED; |
252b5132 RH |
419 | struct bfd_link_info * info; |
420 | bfd * input_bfd; | |
421 | asection * input_section; | |
422 | bfd_byte * contents; | |
423 | Elf_Internal_Rela * relocs; | |
424 | Elf_Internal_Sym * local_syms; | |
425 | asection ** local_sections; | |
426 | { | |
427 | Elf_Internal_Shdr * symtab_hdr = & elf_tdata (input_bfd)->symtab_hdr; | |
428 | struct elf_link_hash_entry ** sym_hashes = elf_sym_hashes (input_bfd); | |
429 | Elf_Internal_Rela * rel = relocs; | |
430 | Elf_Internal_Rela * relend = relocs + input_section->reloc_count; | |
431 | boolean ret = true; | |
252b5132 RH |
432 | |
433 | #ifdef DEBUG | |
434 | fprintf (stderr, | |
435 | "mcore_elf_relocate_section called for %s section %s, %ld relocations%s\n", | |
436 | bfd_get_filename (input_bfd), | |
437 | bfd_section_name(input_bfd, input_section), | |
438 | (long) input_section->reloc_count, | |
439 | (info->relocateable) ? " (relocatable)" : ""); | |
440 | #endif | |
441 | ||
442 | if (! mcore_elf_howto_table [R_MCORE_PCRELIMM8BY4]) /* Initialize howto table if needed */ | |
443 | mcore_elf_howto_init (); | |
444 | ||
445 | for (; rel < relend; rel++) | |
446 | { | |
447 | enum elf_mcore_reloc_type r_type = (enum elf_mcore_reloc_type) ELF32_R_TYPE (rel->r_info); | |
448 | bfd_vma offset = rel->r_offset; | |
449 | bfd_vma addend = rel->r_addend; | |
450 | bfd_reloc_status_type r = bfd_reloc_other; | |
451 | asection * sec = (asection *) 0; | |
452 | reloc_howto_type * howto; | |
453 | bfd_vma relocation; | |
454 | Elf_Internal_Sym * sym = (Elf_Internal_Sym *) 0; | |
455 | unsigned long r_symndx; | |
456 | struct elf_link_hash_entry * h = (struct elf_link_hash_entry *) 0; | |
457 | unsigned short oldinst; | |
458 | ||
459 | /* Unknown relocation handling */ | |
460 | if ((unsigned) r_type >= (unsigned) R_MCORE_max | |
461 | || ! mcore_elf_howto_table [(int)r_type]) | |
462 | { | |
463 | _bfd_error_handler (_("%s: Unknown relocation type %d\n"), | |
464 | bfd_get_filename (input_bfd), | |
465 | (int) r_type); | |
466 | ||
467 | bfd_set_error (bfd_error_bad_value); | |
468 | ret = false; | |
469 | continue; | |
470 | } | |
471 | ||
472 | howto = mcore_elf_howto_table [(int) r_type]; | |
473 | r_symndx = ELF32_R_SYM (rel->r_info); | |
474 | ||
475 | if (info->relocateable) | |
476 | { | |
477 | /* This is a relocateable link. We don't have to change | |
478 | anything, unless the reloc is against a section symbol, | |
479 | in which case we have to adjust according to where the | |
480 | section symbol winds up in the output section. */ | |
481 | if (r_symndx < symtab_hdr->sh_info) | |
482 | { | |
483 | sym = local_syms + r_symndx; | |
484 | ||
485 | if ((unsigned)ELF_ST_TYPE (sym->st_info) == STT_SECTION) | |
486 | { | |
487 | sec = local_sections[r_symndx]; | |
488 | addend = rel->r_addend += sec->output_offset + sym->st_value; | |
489 | } | |
490 | } | |
491 | ||
492 | #ifdef DEBUG | |
493 | fprintf (stderr, "\ttype = %s (%d), symbol index = %ld, offset = %ld, addend = %ld\n", | |
494 | howto->name, (int) r_type, r_symndx, (long) offset, (long) addend); | |
495 | #endif | |
496 | continue; | |
497 | } | |
498 | ||
499 | /* This is a final link. */ | |
500 | ||
501 | /* Complain about known relocation that are not yet supported */ | |
502 | if (howto->special_function == mcore_elf_unsupported_reloc) | |
503 | { | |
504 | _bfd_error_handler (_("%s: Relocation %s (%d) is not currently supported.\n"), | |
505 | bfd_get_filename (input_bfd), | |
506 | howto->name, | |
507 | (int)r_type); | |
508 | ||
509 | bfd_set_error (bfd_error_bad_value); | |
510 | ret = false; | |
511 | continue; | |
512 | } | |
513 | ||
514 | if (r_symndx < symtab_hdr->sh_info) | |
515 | { | |
516 | sym = local_syms + r_symndx; | |
517 | sec = local_sections [r_symndx]; | |
518 | relocation = (sec->output_section->vma | |
519 | + sec->output_offset | |
520 | + sym->st_value); | |
521 | } | |
522 | else | |
523 | { | |
524 | h = sym_hashes [r_symndx - symtab_hdr->sh_info]; | |
525 | if ( h->root.type == bfd_link_hash_defined | |
526 | || h->root.type == bfd_link_hash_defweak) | |
527 | { | |
528 | sec = h->root.u.def.section; | |
529 | relocation = (h->root.u.def.value | |
530 | + sec->output_section->vma | |
531 | + sec->output_offset); | |
532 | } | |
533 | else if (h->root.type == bfd_link_hash_undefweak) | |
534 | relocation = 0; | |
535 | else if (info->shared) | |
536 | relocation = 0; | |
537 | else | |
538 | { | |
539 | if (! ((*info->callbacks->undefined_symbol) | |
540 | (info, h->root.root.string, input_bfd, | |
5cc7c785 | 541 | input_section, rel->r_offset, true))) |
252b5132 RH |
542 | return false; |
543 | ||
544 | ret = false; | |
545 | continue; | |
546 | } | |
547 | } | |
548 | ||
549 | switch (r_type) | |
550 | { | |
551 | default: | |
252b5132 RH |
552 | break; |
553 | ||
554 | case R_MCORE_PCRELJSR_IMM11BY2: | |
555 | oldinst = bfd_get_16 (input_bfd, contents + offset); | |
556 | #define MCORE_INST_BSR 0xF800 | |
557 | bfd_put_16 (input_bfd, MCORE_INST_BSR, contents + offset); | |
558 | break; | |
559 | } | |
560 | ||
561 | ||
562 | #ifdef DEBUG | |
563 | fprintf (stderr, "\ttype = %s (%d), symbol index = %ld, offset = %ld, addend = %ld\n", | |
564 | howto->name, r_type, r_symndx, (long) offset, (long) addend); | |
565 | #endif | |
566 | ||
567 | r = _bfd_final_link_relocate | |
568 | (howto, input_bfd, input_section, contents, offset, relocation, addend); | |
569 | ||
570 | if (r != bfd_reloc_ok && r_type == R_MCORE_PCRELJSR_IMM11BY2) | |
571 | { | |
572 | /* Wasn't ok, back it out and give up. */ | |
573 | bfd_put_16 (input_bfd, oldinst, contents + offset); | |
574 | r = bfd_reloc_ok; | |
575 | } | |
576 | ||
577 | if (r != bfd_reloc_ok) | |
578 | { | |
579 | ret = false; | |
580 | ||
581 | switch (r) | |
582 | { | |
583 | default: | |
584 | break; | |
585 | ||
586 | case bfd_reloc_overflow: | |
587 | { | |
588 | const char * name; | |
589 | ||
590 | if (h != NULL) | |
591 | name = h->root.root.string; | |
592 | else | |
593 | { | |
594 | name = bfd_elf_string_from_elf_section | |
595 | (input_bfd, symtab_hdr->sh_link, sym->st_name); | |
596 | ||
597 | if (name == NULL) | |
598 | break; | |
599 | ||
600 | if (* name == '\0') | |
601 | name = bfd_section_name (input_bfd, sec); | |
602 | } | |
603 | ||
604 | (*info->callbacks->reloc_overflow) | |
605 | (info, name, howto->name, (bfd_vma) 0, input_bfd, input_section, | |
606 | offset); | |
607 | } | |
608 | break; | |
609 | } | |
610 | } | |
611 | } | |
612 | ||
613 | #ifdef DEBUG | |
614 | fprintf (stderr, "\n"); | |
615 | #endif | |
616 | ||
617 | return ret; | |
618 | } | |
619 | \f | |
620 | /* Return the section that should be marked against GC for a given | |
621 | relocation. */ | |
622 | ||
623 | static asection * | |
624 | mcore_elf_gc_mark_hook (abfd, info, rel, h, sym) | |
625 | bfd * abfd; | |
5f771d47 | 626 | struct bfd_link_info * info ATTRIBUTE_UNUSED; |
252b5132 RH |
627 | Elf_Internal_Rela * rel; |
628 | struct elf_link_hash_entry * h; | |
629 | Elf_Internal_Sym * sym; | |
630 | { | |
631 | if (h != NULL) | |
632 | { | |
633 | switch (ELF32_R_TYPE (rel->r_info)) | |
634 | { | |
635 | case R_MCORE_GNU_VTINHERIT: | |
636 | case R_MCORE_GNU_VTENTRY: | |
637 | break; | |
638 | ||
639 | default: | |
640 | switch (h->root.type) | |
641 | { | |
642 | case bfd_link_hash_defined: | |
643 | case bfd_link_hash_defweak: | |
644 | return h->root.u.def.section; | |
645 | ||
646 | case bfd_link_hash_common: | |
647 | return h->root.u.c.p->section; | |
e049a0de ILT |
648 | |
649 | default: | |
650 | break; | |
252b5132 RH |
651 | } |
652 | } | |
653 | } | |
654 | else | |
655 | { | |
656 | if (!(elf_bad_symtab (abfd) | |
657 | && ELF_ST_BIND (sym->st_info) != STB_LOCAL) | |
658 | && ! ((sym->st_shndx <= 0 || sym->st_shndx >= SHN_LORESERVE) | |
659 | && sym->st_shndx != SHN_COMMON)) | |
660 | { | |
661 | return bfd_section_from_elf_index (abfd, sym->st_shndx); | |
662 | } | |
663 | } | |
664 | ||
665 | return NULL; | |
666 | } | |
667 | ||
668 | /* Update the got entry reference counts for the section being removed. */ | |
669 | ||
670 | static boolean | |
671 | mcore_elf_gc_sweep_hook (abfd, info, sec, relocs) | |
5f771d47 ILT |
672 | bfd * abfd ATTRIBUTE_UNUSED; |
673 | struct bfd_link_info * info ATTRIBUTE_UNUSED; | |
674 | asection * sec ATTRIBUTE_UNUSED; | |
675 | const Elf_Internal_Rela * relocs ATTRIBUTE_UNUSED; | |
252b5132 RH |
676 | { |
677 | return true; | |
678 | } | |
679 | ||
680 | /* Look through the relocs for a section during the first phase. | |
681 | Since we don't do .gots or .plts, we just need to consider the | |
682 | virtual table relocs for gc. */ | |
683 | ||
684 | static boolean | |
685 | mcore_elf_check_relocs (abfd, info, sec, relocs) | |
686 | bfd * abfd; | |
687 | struct bfd_link_info * info; | |
688 | asection * sec; | |
689 | const Elf_Internal_Rela * relocs; | |
690 | { | |
691 | Elf_Internal_Shdr * symtab_hdr; | |
692 | struct elf_link_hash_entry ** sym_hashes; | |
693 | struct elf_link_hash_entry ** sym_hashes_end; | |
694 | const Elf_Internal_Rela * rel; | |
695 | const Elf_Internal_Rela * rel_end; | |
696 | ||
697 | if (info->relocateable) | |
698 | return true; | |
699 | ||
700 | symtab_hdr = & elf_tdata (abfd)->symtab_hdr; | |
701 | sym_hashes = elf_sym_hashes (abfd); | |
702 | sym_hashes_end = sym_hashes + symtab_hdr->sh_size / sizeof (Elf32_External_Sym); | |
703 | if (!elf_bad_symtab (abfd)) | |
704 | sym_hashes_end -= symtab_hdr->sh_info; | |
705 | ||
706 | rel_end = relocs + sec->reloc_count; | |
707 | ||
708 | for (rel = relocs; rel < rel_end; rel++) | |
709 | { | |
710 | struct elf_link_hash_entry * h; | |
711 | unsigned long r_symndx; | |
712 | ||
713 | r_symndx = ELF32_R_SYM (rel->r_info); | |
714 | ||
715 | if (r_symndx < symtab_hdr->sh_info) | |
716 | h = NULL; | |
717 | else | |
718 | h = sym_hashes [r_symndx - symtab_hdr->sh_info]; | |
719 | ||
720 | switch (ELF32_R_TYPE (rel->r_info)) | |
721 | { | |
722 | /* This relocation describes the C++ object vtable hierarchy. | |
723 | Reconstruct it for later use during GC. */ | |
724 | case R_MCORE_GNU_VTINHERIT: | |
725 | if (!_bfd_elf32_gc_record_vtinherit (abfd, sec, h, rel->r_offset)) | |
726 | return false; | |
727 | break; | |
728 | ||
729 | /* This relocation describes which C++ vtable entries are actually | |
730 | used. Record for later use during GC. */ | |
731 | case R_MCORE_GNU_VTENTRY: | |
732 | if (!_bfd_elf32_gc_record_vtentry (abfd, sec, h, rel->r_addend)) | |
733 | return false; | |
734 | break; | |
735 | } | |
736 | } | |
737 | ||
738 | return true; | |
739 | } | |
740 | ||
741 | #define TARGET_BIG_SYM bfd_elf32_mcore_big_vec | |
742 | #define TARGET_BIG_NAME "elf32-mcore-big" | |
743 | #define TARGET_LITTLE_SYM bfd_elf32_mcore_little_vec | |
744 | #define TARGET_LITTLE_NAME "elf32-mcore-little" | |
745 | ||
746 | #define ELF_ARCH bfd_arch_mcore | |
747 | #define ELF_MACHINE_CODE EM_MCORE | |
748 | #define ELF_MAXPAGESIZE 0x1000 /* 4k, if we ever have 'em */ | |
749 | #define elf_info_to_howto mcore_elf_info_to_howto | |
750 | #define elf_info_to_howto_rel NULL | |
751 | ||
752 | ||
753 | #define bfd_elf32_bfd_copy_private_bfd_data mcore_elf_copy_private_bfd_data | |
754 | #define bfd_elf32_bfd_merge_private_bfd_data mcore_elf_merge_private_bfd_data | |
755 | #define bfd_elf32_bfd_set_private_flags mcore_elf_set_private_flags | |
756 | #define bfd_elf32_bfd_reloc_type_lookup mcore_elf_reloc_type_lookup | |
757 | #define elf_backend_relocate_section mcore_elf_relocate_section | |
758 | #define elf_backend_gc_mark_hook mcore_elf_gc_mark_hook | |
759 | #define elf_backend_gc_sweep_hook mcore_elf_gc_sweep_hook | |
760 | #define elf_backend_check_relocs mcore_elf_check_relocs | |
761 | ||
762 | #define elf_backend_can_gc_sections 1 | |
763 | ||
764 | #include "elf32-target.h" |