Commit | Line | Data |
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59d23ada | 1 | /* Motorola MCore specific support for 32-bit ELF |
7898deda | 2 | Copyright 1994, 1995, 1999, 2000, 2001 Free Software Foundation, Inc. |
252b5132 RH |
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 | |
c3668558 | 32 | here are a reminder... */ |
252b5132 RH |
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. | |
c3668558 | 87 | Should not appear in object files. */ |
252b5132 RH |
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 | ||
c3668558 | 102 | /* bsr/bt/bf/br instructions; 11 bits + 1 zero bit |
252b5132 RH |
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 | ||
c3668558 | 119 | /* 4 bits + 1 zero bit; 'loopt' instruction only; unsupported. */ |
252b5132 RH |
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 | ||
c3668558 | 134 | /* 32-bit pc-relative. Eventually this will help support PIC code. */ |
252b5132 RH |
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 | |
c3668558 | 151 | entry for the literal pool entry that it references, but we |
252b5132 RH |
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 | |
c3668558 | 155 | is a relocation that we are allowed to safely ignore. */ |
252b5132 RH |
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 */ | |
c3668558 | 169 | |
252b5132 RH |
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 */ | |
c3668558 | 199 | |
36797d47 NC |
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; | |
c3668558 | 228 | |
252b5132 | 229 | type = mcore_elf_howto_raw[i].type; |
c3668558 | 230 | |
252b5132 | 231 | BFD_ASSERT (type < NUM_ELEM (mcore_elf_howto_table)); |
c3668558 | 232 | |
252b5132 RH |
233 | mcore_elf_howto_table [type] = & mcore_elf_howto_raw [i]; |
234 | } | |
235 | } | |
252b5132 RH |
236 | \f |
237 | static reloc_howto_type * | |
238 | mcore_elf_reloc_type_lookup (abfd, code) | |
5f771d47 | 239 | bfd * abfd ATTRIBUTE_UNUSED; |
252b5132 RH |
240 | bfd_reloc_code_real_type code; |
241 | { | |
242 | enum elf_mcore_reloc_type mcore_reloc = R_MCORE_NONE; | |
243 | ||
244 | switch (code) | |
245 | { | |
246 | case BFD_RELOC_NONE: mcore_reloc = R_MCORE_NONE; break; | |
247 | case BFD_RELOC_32: mcore_reloc = R_MCORE_ADDR32; break; | |
248 | case BFD_RELOC_MCORE_PCREL_IMM8BY4: mcore_reloc = R_MCORE_PCRELIMM8BY4; break; | |
249 | case BFD_RELOC_MCORE_PCREL_IMM11BY2: mcore_reloc = R_MCORE_PCRELIMM11BY2; break; | |
250 | case BFD_RELOC_MCORE_PCREL_IMM4BY2: mcore_reloc = R_MCORE_PCRELIMM4BY2; break; | |
251 | case BFD_RELOC_32_PCREL: mcore_reloc = R_MCORE_PCREL32; break; | |
252 | case BFD_RELOC_MCORE_PCREL_JSR_IMM11BY2: mcore_reloc = R_MCORE_PCRELJSR_IMM11BY2; break; | |
253 | case BFD_RELOC_VTABLE_INHERIT: mcore_reloc = R_MCORE_GNU_VTINHERIT; break; | |
254 | case BFD_RELOC_VTABLE_ENTRY: mcore_reloc = R_MCORE_GNU_VTENTRY; break; | |
36797d47 | 255 | case BFD_RELOC_RVA: mcore_reloc = R_MCORE_RELATIVE; break; |
252b5132 RH |
256 | default: |
257 | return (reloc_howto_type *)NULL; | |
258 | } | |
259 | ||
260 | if (! mcore_elf_howto_table [R_MCORE_PCRELIMM8BY4]) /* Initialize howto table if needed */ | |
261 | mcore_elf_howto_init (); | |
262 | ||
263 | return mcore_elf_howto_table [(int) mcore_reloc]; | |
264 | }; | |
265 | ||
266 | /* Set the howto pointer for a RCE ELF reloc. */ | |
267 | static void | |
268 | mcore_elf_info_to_howto (abfd, cache_ptr, dst) | |
5f771d47 | 269 | bfd * abfd ATTRIBUTE_UNUSED; |
252b5132 RH |
270 | arelent * cache_ptr; |
271 | Elf32_Internal_Rela * dst; | |
272 | { | |
273 | if (! mcore_elf_howto_table [R_MCORE_PCRELIMM8BY4]) /* Initialize howto table if needed */ | |
274 | mcore_elf_howto_init (); | |
275 | ||
276 | BFD_ASSERT (ELF32_R_TYPE (dst->r_info) < (unsigned int) R_MCORE_max); | |
c3668558 | 277 | |
252b5132 RH |
278 | cache_ptr->howto = mcore_elf_howto_table [ELF32_R_TYPE (dst->r_info)]; |
279 | } | |
280 | ||
c3668558 | 281 | /* Function to set whether a module needs the -mrelocatable bit set. */ |
252b5132 RH |
282 | static boolean |
283 | mcore_elf_set_private_flags (abfd, flags) | |
284 | bfd * abfd; | |
285 | flagword flags; | |
286 | { | |
287 | BFD_ASSERT (! elf_flags_init (abfd) | |
288 | || elf_elfheader (abfd)->e_flags == flags); | |
289 | ||
290 | elf_elfheader (abfd)->e_flags = flags; | |
291 | elf_flags_init (abfd) = true; | |
292 | return true; | |
293 | } | |
294 | ||
295 | /* Copy backend specific data from one object module to another. */ | |
296 | static boolean | |
297 | mcore_elf_copy_private_bfd_data (ibfd, obfd) | |
298 | bfd * ibfd; | |
299 | bfd * obfd; | |
300 | { | |
301 | if ( bfd_get_flavour (ibfd) != bfd_target_elf_flavour | |
302 | || bfd_get_flavour (obfd) != bfd_target_elf_flavour) | |
303 | return true; | |
304 | ||
305 | BFD_ASSERT (! elf_flags_init (obfd) | |
306 | || elf_elfheader (obfd)->e_flags == elf_elfheader (ibfd)->e_flags); | |
307 | ||
308 | elf_elfheader (obfd)->e_flags = elf_elfheader (ibfd)->e_flags; | |
309 | elf_flags_init (obfd) = true; | |
310 | return true; | |
311 | } | |
312 | ||
313 | /* Merge backend specific data from an object file to the output | |
314 | object file when linking. */ | |
315 | static boolean | |
316 | mcore_elf_merge_private_bfd_data (ibfd, obfd) | |
317 | bfd * ibfd; | |
318 | bfd * obfd; | |
319 | { | |
320 | flagword old_flags; | |
321 | flagword new_flags; | |
252b5132 RH |
322 | |
323 | /* Check if we have the same endianess */ | |
1fe494a5 NC |
324 | if (_bfd_generic_verify_endian_match (ibfd, obfd) == false) |
325 | return false; | |
252b5132 RH |
326 | |
327 | if ( bfd_get_flavour (ibfd) != bfd_target_elf_flavour | |
328 | || bfd_get_flavour (obfd) != bfd_target_elf_flavour) | |
329 | return true; | |
330 | ||
331 | new_flags = elf_elfheader (ibfd)->e_flags; | |
332 | old_flags = elf_elfheader (obfd)->e_flags; | |
c3668558 | 333 | |
252b5132 RH |
334 | if (! elf_flags_init (obfd)) /* First call, no flags set */ |
335 | { | |
336 | elf_flags_init (obfd) = true; | |
337 | elf_elfheader (obfd)->e_flags = new_flags; | |
338 | } | |
339 | else if (new_flags == old_flags) /* Compatible flags are ok */ | |
340 | ; | |
5f771d47 ILT |
341 | else |
342 | { | |
343 | /* FIXME */ | |
344 | } | |
345 | ||
252b5132 RH |
346 | return true; |
347 | } | |
252b5132 RH |
348 | \f |
349 | /* Don't pretend we can deal with unsupported relocs. */ | |
350 | ||
252b5132 RH |
351 | static bfd_reloc_status_type |
352 | mcore_elf_unsupported_reloc (abfd, reloc_entry, symbol, data, input_section, | |
353 | output_bfd, error_message) | |
354 | bfd * abfd; | |
355 | arelent * reloc_entry; | |
5f771d47 ILT |
356 | asymbol * symbol ATTRIBUTE_UNUSED; |
357 | PTR data ATTRIBUTE_UNUSED; | |
358 | asection * input_section ATTRIBUTE_UNUSED; | |
359 | bfd * output_bfd ATTRIBUTE_UNUSED; | |
360 | char ** error_message ATTRIBUTE_UNUSED; | |
252b5132 RH |
361 | { |
362 | BFD_ASSERT (reloc_entry->howto != (reloc_howto_type *)0); | |
c3668558 | 363 | |
252b5132 RH |
364 | _bfd_error_handler (_("%s: Relocation %s (%d) is not currently supported.\n"), |
365 | bfd_get_filename (abfd), | |
366 | reloc_entry->howto->name, | |
367 | reloc_entry->howto->type); | |
368 | ||
369 | return bfd_reloc_notsupported; | |
370 | } | |
252b5132 RH |
371 | \f |
372 | /* The RELOCATE_SECTION function is called by the ELF backend linker | |
373 | to handle the relocations for a section. | |
374 | ||
375 | The relocs are always passed as Rela structures; if the section | |
376 | actually uses Rel structures, the r_addend field will always be | |
377 | zero. | |
378 | ||
379 | This function is responsible for adjust the section contents as | |
380 | necessary, and (if using Rela relocs and generating a | |
381 | relocateable output file) adjusting the reloc addend as | |
382 | necessary. | |
383 | ||
384 | This function does not have to worry about setting the reloc | |
385 | address or the reloc symbol index. | |
386 | ||
387 | LOCAL_SYMS is a pointer to the swapped in local symbols. | |
388 | ||
389 | LOCAL_SECTIONS is an array giving the section in the input file | |
390 | corresponding to the st_shndx field of each local symbol. | |
391 | ||
392 | The global hash table entry for the global symbols can be found | |
393 | via elf_sym_hashes (input_bfd). | |
394 | ||
395 | When generating relocateable output, this function must handle | |
396 | STB_LOCAL/STT_SECTION symbols specially. The output symbol is | |
397 | going to be the section symbol corresponding to the output | |
398 | section, which means that the addend must be adjusted | |
399 | accordingly. */ | |
400 | ||
401 | static boolean | |
402 | mcore_elf_relocate_section (output_bfd, info, input_bfd, input_section, | |
403 | contents, relocs, local_syms, local_sections) | |
5f771d47 | 404 | bfd * output_bfd ATTRIBUTE_UNUSED; |
252b5132 RH |
405 | struct bfd_link_info * info; |
406 | bfd * input_bfd; | |
407 | asection * input_section; | |
408 | bfd_byte * contents; | |
409 | Elf_Internal_Rela * relocs; | |
410 | Elf_Internal_Sym * local_syms; | |
411 | asection ** local_sections; | |
412 | { | |
413 | Elf_Internal_Shdr * symtab_hdr = & elf_tdata (input_bfd)->symtab_hdr; | |
414 | struct elf_link_hash_entry ** sym_hashes = elf_sym_hashes (input_bfd); | |
415 | Elf_Internal_Rela * rel = relocs; | |
416 | Elf_Internal_Rela * relend = relocs + input_section->reloc_count; | |
417 | boolean ret = true; | |
252b5132 RH |
418 | |
419 | #ifdef DEBUG | |
420 | fprintf (stderr, | |
421 | "mcore_elf_relocate_section called for %s section %s, %ld relocations%s\n", | |
422 | bfd_get_filename (input_bfd), | |
423 | bfd_section_name(input_bfd, input_section), | |
424 | (long) input_section->reloc_count, | |
425 | (info->relocateable) ? " (relocatable)" : ""); | |
426 | #endif | |
427 | ||
428 | if (! mcore_elf_howto_table [R_MCORE_PCRELIMM8BY4]) /* Initialize howto table if needed */ | |
429 | mcore_elf_howto_init (); | |
430 | ||
431 | for (; rel < relend; rel++) | |
432 | { | |
433 | enum elf_mcore_reloc_type r_type = (enum elf_mcore_reloc_type) ELF32_R_TYPE (rel->r_info); | |
434 | bfd_vma offset = rel->r_offset; | |
435 | bfd_vma addend = rel->r_addend; | |
436 | bfd_reloc_status_type r = bfd_reloc_other; | |
437 | asection * sec = (asection *) 0; | |
438 | reloc_howto_type * howto; | |
439 | bfd_vma relocation; | |
440 | Elf_Internal_Sym * sym = (Elf_Internal_Sym *) 0; | |
441 | unsigned long r_symndx; | |
442 | struct elf_link_hash_entry * h = (struct elf_link_hash_entry *) 0; | |
86033394 | 443 | unsigned short oldinst = 0; |
c3668558 | 444 | |
252b5132 RH |
445 | /* Unknown relocation handling */ |
446 | if ((unsigned) r_type >= (unsigned) R_MCORE_max | |
447 | || ! mcore_elf_howto_table [(int)r_type]) | |
448 | { | |
449 | _bfd_error_handler (_("%s: Unknown relocation type %d\n"), | |
450 | bfd_get_filename (input_bfd), | |
451 | (int) r_type); | |
452 | ||
453 | bfd_set_error (bfd_error_bad_value); | |
454 | ret = false; | |
455 | continue; | |
456 | } | |
c3668558 | 457 | |
252b5132 RH |
458 | howto = mcore_elf_howto_table [(int) r_type]; |
459 | r_symndx = ELF32_R_SYM (rel->r_info); | |
c3668558 | 460 | |
252b5132 RH |
461 | if (info->relocateable) |
462 | { | |
463 | /* This is a relocateable link. We don't have to change | |
464 | anything, unless the reloc is against a section symbol, | |
465 | in which case we have to adjust according to where the | |
466 | section symbol winds up in the output section. */ | |
467 | if (r_symndx < symtab_hdr->sh_info) | |
468 | { | |
469 | sym = local_syms + r_symndx; | |
c3668558 | 470 | |
252b5132 RH |
471 | if ((unsigned)ELF_ST_TYPE (sym->st_info) == STT_SECTION) |
472 | { | |
473 | sec = local_sections[r_symndx]; | |
474 | addend = rel->r_addend += sec->output_offset + sym->st_value; | |
475 | } | |
476 | } | |
477 | ||
478 | #ifdef DEBUG | |
479 | fprintf (stderr, "\ttype = %s (%d), symbol index = %ld, offset = %ld, addend = %ld\n", | |
480 | howto->name, (int) r_type, r_symndx, (long) offset, (long) addend); | |
481 | #endif | |
482 | continue; | |
483 | } | |
484 | ||
485 | /* This is a final link. */ | |
486 | ||
a022216b | 487 | /* Complain about known relocation that are not yet supported. */ |
252b5132 RH |
488 | if (howto->special_function == mcore_elf_unsupported_reloc) |
489 | { | |
490 | _bfd_error_handler (_("%s: Relocation %s (%d) is not currently supported.\n"), | |
491 | bfd_get_filename (input_bfd), | |
492 | howto->name, | |
493 | (int)r_type); | |
494 | ||
495 | bfd_set_error (bfd_error_bad_value); | |
496 | ret = false; | |
497 | continue; | |
498 | } | |
499 | ||
500 | if (r_symndx < symtab_hdr->sh_info) | |
501 | { | |
502 | sym = local_syms + r_symndx; | |
503 | sec = local_sections [r_symndx]; | |
504 | relocation = (sec->output_section->vma | |
505 | + sec->output_offset | |
506 | + sym->st_value); | |
507 | } | |
508 | else | |
509 | { | |
510 | h = sym_hashes [r_symndx - symtab_hdr->sh_info]; | |
511 | if ( h->root.type == bfd_link_hash_defined | |
512 | || h->root.type == bfd_link_hash_defweak) | |
513 | { | |
514 | sec = h->root.u.def.section; | |
515 | relocation = (h->root.u.def.value | |
516 | + sec->output_section->vma | |
517 | + sec->output_offset); | |
518 | } | |
519 | else if (h->root.type == bfd_link_hash_undefweak) | |
520 | relocation = 0; | |
3a27a730 L |
521 | else if (info->shared |
522 | && ELF_ST_VISIBILITY (h->other) == STV_DEFAULT) | |
252b5132 RH |
523 | relocation = 0; |
524 | else | |
525 | { | |
526 | if (! ((*info->callbacks->undefined_symbol) | |
527 | (info, h->root.root.string, input_bfd, | |
5cc7c785 | 528 | input_section, rel->r_offset, true))) |
252b5132 RH |
529 | return false; |
530 | ||
531 | ret = false; | |
532 | continue; | |
533 | } | |
534 | } | |
535 | ||
536 | switch (r_type) | |
537 | { | |
538 | default: | |
252b5132 RH |
539 | break; |
540 | ||
541 | case R_MCORE_PCRELJSR_IMM11BY2: | |
542 | oldinst = bfd_get_16 (input_bfd, contents + offset); | |
543 | #define MCORE_INST_BSR 0xF800 | |
544 | bfd_put_16 (input_bfd, MCORE_INST_BSR, contents + offset); | |
545 | break; | |
546 | } | |
547 | ||
252b5132 RH |
548 | #ifdef DEBUG |
549 | fprintf (stderr, "\ttype = %s (%d), symbol index = %ld, offset = %ld, addend = %ld\n", | |
550 | howto->name, r_type, r_symndx, (long) offset, (long) addend); | |
551 | #endif | |
552 | ||
553 | r = _bfd_final_link_relocate | |
554 | (howto, input_bfd, input_section, contents, offset, relocation, addend); | |
555 | ||
556 | if (r != bfd_reloc_ok && r_type == R_MCORE_PCRELJSR_IMM11BY2) | |
557 | { | |
558 | /* Wasn't ok, back it out and give up. */ | |
559 | bfd_put_16 (input_bfd, oldinst, contents + offset); | |
560 | r = bfd_reloc_ok; | |
561 | } | |
c3668558 | 562 | |
252b5132 RH |
563 | if (r != bfd_reloc_ok) |
564 | { | |
565 | ret = false; | |
c3668558 | 566 | |
252b5132 RH |
567 | switch (r) |
568 | { | |
569 | default: | |
570 | break; | |
571 | ||
572 | case bfd_reloc_overflow: | |
573 | { | |
574 | const char * name; | |
575 | ||
576 | if (h != NULL) | |
577 | name = h->root.root.string; | |
578 | else | |
579 | { | |
580 | name = bfd_elf_string_from_elf_section | |
581 | (input_bfd, symtab_hdr->sh_link, sym->st_name); | |
c3668558 | 582 | |
252b5132 RH |
583 | if (name == NULL) |
584 | break; | |
585 | ||
586 | if (* name == '\0') | |
587 | name = bfd_section_name (input_bfd, sec); | |
588 | } | |
589 | ||
590 | (*info->callbacks->reloc_overflow) | |
591 | (info, name, howto->name, (bfd_vma) 0, input_bfd, input_section, | |
592 | offset); | |
593 | } | |
594 | break; | |
595 | } | |
596 | } | |
597 | } | |
598 | ||
599 | #ifdef DEBUG | |
600 | fprintf (stderr, "\n"); | |
601 | #endif | |
602 | ||
603 | return ret; | |
604 | } | |
605 | \f | |
606 | /* Return the section that should be marked against GC for a given | |
607 | relocation. */ | |
608 | ||
609 | static asection * | |
610 | mcore_elf_gc_mark_hook (abfd, info, rel, h, sym) | |
611 | bfd * abfd; | |
5f771d47 | 612 | struct bfd_link_info * info ATTRIBUTE_UNUSED; |
252b5132 RH |
613 | Elf_Internal_Rela * rel; |
614 | struct elf_link_hash_entry * h; | |
615 | Elf_Internal_Sym * sym; | |
616 | { | |
617 | if (h != NULL) | |
618 | { | |
619 | switch (ELF32_R_TYPE (rel->r_info)) | |
620 | { | |
621 | case R_MCORE_GNU_VTINHERIT: | |
622 | case R_MCORE_GNU_VTENTRY: | |
623 | break; | |
624 | ||
625 | default: | |
626 | switch (h->root.type) | |
627 | { | |
628 | case bfd_link_hash_defined: | |
629 | case bfd_link_hash_defweak: | |
630 | return h->root.u.def.section; | |
c3668558 | 631 | |
252b5132 RH |
632 | case bfd_link_hash_common: |
633 | return h->root.u.c.p->section; | |
e049a0de ILT |
634 | |
635 | default: | |
636 | break; | |
252b5132 RH |
637 | } |
638 | } | |
639 | } | |
640 | else | |
641 | { | |
642 | if (!(elf_bad_symtab (abfd) | |
643 | && ELF_ST_BIND (sym->st_info) != STB_LOCAL) | |
644 | && ! ((sym->st_shndx <= 0 || sym->st_shndx >= SHN_LORESERVE) | |
645 | && sym->st_shndx != SHN_COMMON)) | |
646 | { | |
647 | return bfd_section_from_elf_index (abfd, sym->st_shndx); | |
648 | } | |
649 | } | |
650 | ||
651 | return NULL; | |
652 | } | |
653 | ||
654 | /* Update the got entry reference counts for the section being removed. */ | |
655 | ||
656 | static boolean | |
657 | mcore_elf_gc_sweep_hook (abfd, info, sec, relocs) | |
5f771d47 ILT |
658 | bfd * abfd ATTRIBUTE_UNUSED; |
659 | struct bfd_link_info * info ATTRIBUTE_UNUSED; | |
660 | asection * sec ATTRIBUTE_UNUSED; | |
661 | const Elf_Internal_Rela * relocs ATTRIBUTE_UNUSED; | |
252b5132 RH |
662 | { |
663 | return true; | |
664 | } | |
665 | ||
666 | /* Look through the relocs for a section during the first phase. | |
667 | Since we don't do .gots or .plts, we just need to consider the | |
668 | virtual table relocs for gc. */ | |
c3668558 | 669 | |
252b5132 RH |
670 | static boolean |
671 | mcore_elf_check_relocs (abfd, info, sec, relocs) | |
672 | bfd * abfd; | |
673 | struct bfd_link_info * info; | |
674 | asection * sec; | |
675 | const Elf_Internal_Rela * relocs; | |
676 | { | |
677 | Elf_Internal_Shdr * symtab_hdr; | |
678 | struct elf_link_hash_entry ** sym_hashes; | |
679 | struct elf_link_hash_entry ** sym_hashes_end; | |
680 | const Elf_Internal_Rela * rel; | |
681 | const Elf_Internal_Rela * rel_end; | |
c3668558 | 682 | |
252b5132 RH |
683 | if (info->relocateable) |
684 | return true; | |
c3668558 | 685 | |
252b5132 RH |
686 | symtab_hdr = & elf_tdata (abfd)->symtab_hdr; |
687 | sym_hashes = elf_sym_hashes (abfd); | |
688 | sym_hashes_end = sym_hashes + symtab_hdr->sh_size / sizeof (Elf32_External_Sym); | |
689 | if (!elf_bad_symtab (abfd)) | |
690 | sym_hashes_end -= symtab_hdr->sh_info; | |
c3668558 | 691 | |
252b5132 | 692 | rel_end = relocs + sec->reloc_count; |
c3668558 | 693 | |
252b5132 RH |
694 | for (rel = relocs; rel < rel_end; rel++) |
695 | { | |
696 | struct elf_link_hash_entry * h; | |
697 | unsigned long r_symndx; | |
c3668558 | 698 | |
252b5132 | 699 | r_symndx = ELF32_R_SYM (rel->r_info); |
c3668558 | 700 | |
252b5132 RH |
701 | if (r_symndx < symtab_hdr->sh_info) |
702 | h = NULL; | |
703 | else | |
704 | h = sym_hashes [r_symndx - symtab_hdr->sh_info]; | |
c3668558 | 705 | |
252b5132 RH |
706 | switch (ELF32_R_TYPE (rel->r_info)) |
707 | { | |
708 | /* This relocation describes the C++ object vtable hierarchy. | |
709 | Reconstruct it for later use during GC. */ | |
710 | case R_MCORE_GNU_VTINHERIT: | |
711 | if (!_bfd_elf32_gc_record_vtinherit (abfd, sec, h, rel->r_offset)) | |
712 | return false; | |
713 | break; | |
c3668558 | 714 | |
252b5132 RH |
715 | /* This relocation describes which C++ vtable entries are actually |
716 | used. Record for later use during GC. */ | |
717 | case R_MCORE_GNU_VTENTRY: | |
718 | if (!_bfd_elf32_gc_record_vtentry (abfd, sec, h, rel->r_addend)) | |
719 | return false; | |
720 | break; | |
721 | } | |
722 | } | |
c3668558 | 723 | |
252b5132 RH |
724 | return true; |
725 | } | |
726 | ||
727 | #define TARGET_BIG_SYM bfd_elf32_mcore_big_vec | |
728 | #define TARGET_BIG_NAME "elf32-mcore-big" | |
729 | #define TARGET_LITTLE_SYM bfd_elf32_mcore_little_vec | |
730 | #define TARGET_LITTLE_NAME "elf32-mcore-little" | |
731 | ||
732 | #define ELF_ARCH bfd_arch_mcore | |
733 | #define ELF_MACHINE_CODE EM_MCORE | |
734 | #define ELF_MAXPAGESIZE 0x1000 /* 4k, if we ever have 'em */ | |
735 | #define elf_info_to_howto mcore_elf_info_to_howto | |
736 | #define elf_info_to_howto_rel NULL | |
737 | ||
252b5132 RH |
738 | #define bfd_elf32_bfd_copy_private_bfd_data mcore_elf_copy_private_bfd_data |
739 | #define bfd_elf32_bfd_merge_private_bfd_data mcore_elf_merge_private_bfd_data | |
740 | #define bfd_elf32_bfd_set_private_flags mcore_elf_set_private_flags | |
741 | #define bfd_elf32_bfd_reloc_type_lookup mcore_elf_reloc_type_lookup | |
742 | #define elf_backend_relocate_section mcore_elf_relocate_section | |
743 | #define elf_backend_gc_mark_hook mcore_elf_gc_mark_hook | |
744 | #define elf_backend_gc_sweep_hook mcore_elf_gc_sweep_hook | |
745 | #define elf_backend_check_relocs mcore_elf_check_relocs | |
746 | ||
747 | #define elf_backend_can_gc_sections 1 | |
748 | ||
749 | #include "elf32-target.h" |