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30dc85f1 ILT |
1 | /* Motorola 68k series support for 32-bit ELF |
2 | Copyright 1993 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 | |
943fbd5b | 18 | Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA. */ |
30dc85f1 ILT |
19 | |
20 | #include "bfd.h" | |
21 | #include "sysdep.h" | |
22 | #include "bfdlink.h" | |
23 | #include "libbfd.h" | |
24 | #include "libelf.h" | |
25 | ||
26 | static reloc_howto_type *reloc_type_lookup | |
27 | PARAMS ((bfd *, bfd_reloc_code_real_type)); | |
28 | static void rtype_to_howto | |
29 | PARAMS ((bfd *, arelent *, Elf32_Internal_Rela *)); | |
30 | static void rtype_to_howto_rel | |
31 | PARAMS ((bfd *, arelent *, Elf32_Internal_Rel *)); | |
30dc85f1 ILT |
32 | static boolean elf_m68k_check_relocs |
33 | PARAMS ((bfd *, struct bfd_link_info *, asection *, | |
34 | const Elf_Internal_Rela *)); | |
35 | static boolean elf_m68k_adjust_dynamic_symbol | |
36 | PARAMS ((struct bfd_link_info *, struct elf_link_hash_entry *)); | |
37 | static boolean elf_m68k_adjust_dynindx | |
38 | PARAMS ((struct elf_link_hash_entry *, PTR)); | |
39 | static boolean elf_m68k_size_dynamic_sections | |
40 | PARAMS ((bfd *, struct bfd_link_info *)); | |
41 | static boolean elf_m68k_relocate_section | |
42 | PARAMS ((bfd *, struct bfd_link_info *, bfd *, asection *, bfd_byte *, | |
43 | Elf_Internal_Rela *, Elf_Internal_Sym *, asection **)); | |
44 | static boolean elf_m68k_finish_dynamic_symbol | |
45 | PARAMS ((bfd *, struct bfd_link_info *, struct elf_link_hash_entry *, | |
46 | Elf_Internal_Sym *)); | |
47 | static boolean elf_m68k_finish_dynamic_sections | |
48 | PARAMS ((bfd *, struct bfd_link_info *)); | |
49 | ||
50 | /* elf32 m68k code, generated by elf.el */ | |
51 | enum reloc_type { | |
52 | R_68K_NONE = 0, | |
53 | R_68K_32 = 1, | |
54 | R_68K_16 = 2, | |
55 | R_68K_8 = 3, | |
56 | R_68K_PC32 = 4, | |
57 | R_68K_PC16 = 5, | |
58 | R_68K_PC8 = 6, | |
59 | R_68K_GOT32 = 7, | |
60 | R_68K_GOT16 = 8, | |
61 | R_68K_GOT8 = 9, | |
62 | R_68K_GOT32O = 10, | |
63 | R_68K_GOT16O = 11, | |
64 | R_68K_GOT8O = 12, | |
65 | R_68K_PLT32 = 13, | |
66 | R_68K_PLT16 = 14, | |
67 | R_68K_PLT8 = 15, | |
68 | R_68K_PLT32O = 16, | |
69 | R_68K_PLT16O = 17, | |
70 | R_68K_PLT8O = 18, | |
71 | R_68K_COPY = 19, | |
72 | R_68K_GLOB_DAT = 20, | |
73 | R_68K_JMP_SLOT = 21, | |
74 | R_68K_RELATIVE = 22, | |
75 | R_68K__max | |
76 | }; | |
77 | ||
78 | static reloc_howto_type howto_table[] = { | |
79 | HOWTO(R_68K_NONE, 0, 0, 0, false,0, complain_overflow_dont, bfd_elf_generic_reloc, "R_68K_NONE", false, 0x00000000, 0x00000000,false), | |
80 | HOWTO(R_68K_32, 0, 2,32, false,0, complain_overflow_bitfield, bfd_elf_generic_reloc, "R_68K_32", false, 0xffffffff, 0xffffffff,false), | |
81 | HOWTO(R_68K_16, 0, 1,16, false,0, complain_overflow_bitfield, bfd_elf_generic_reloc, "R_68K_16", false, 0x0000ffff, 0x0000ffff,false), | |
82 | HOWTO(R_68K_8, 0, 0, 8, false,0, complain_overflow_bitfield, bfd_elf_generic_reloc, "R_68K_8", false, 0x000000ff, 0x000000ff,false), | |
83 | HOWTO(R_68K_PC32, 0, 2,32, true, 0, complain_overflow_signed, bfd_elf_generic_reloc, "R_68K_PC32", false, 0xffffffff, 0xffffffff,true), | |
84 | HOWTO(R_68K_PC16, 0, 1,16, true, 0, complain_overflow_signed, bfd_elf_generic_reloc, "R_68K_PC16", false, 0x0000ffff, 0x0000ffff,true), | |
85 | HOWTO(R_68K_PC8, 0, 0, 8, true, 0, complain_overflow_signed, bfd_elf_generic_reloc, "R_68K_PC8", false, 0x000000ff, 0x000000ff,true), | |
86 | HOWTO(R_68K_GOT32, 0, 2,32, true, 0, complain_overflow_signed, bfd_elf_generic_reloc, "R_68K_GOT32", false, 0xffffffff, 0xffffffff,true), | |
87 | HOWTO(R_68K_GOT16, 0, 1,16, true, 0, complain_overflow_signed, bfd_elf_generic_reloc, "R_68K_GOT16", false, 0x0000ffff, 0x0000ffff,true), | |
88 | HOWTO(R_68K_GOT8, 0, 0, 8, true, 0, complain_overflow_signed, bfd_elf_generic_reloc, "R_68K_GOT8", false, 0x000000ff, 0x000000ff,true), | |
89 | HOWTO(R_68K_GOT32O, 0, 2,32, false,0, complain_overflow_signed, bfd_elf_generic_reloc, "R_68K_GOT32O", false, 0xffffffff, 0xffffffff,false), | |
90 | HOWTO(R_68K_GOT16O, 0, 1,16, false,0, complain_overflow_signed, bfd_elf_generic_reloc, "R_68K_GOT16O", false, 0x0000ffff, 0x0000ffff,false), | |
91 | HOWTO(R_68K_GOT8O, 0, 0, 8, false,0, complain_overflow_signed, bfd_elf_generic_reloc, "R_68K_GOT8O", false, 0x000000ff, 0x000000ff,false), | |
92 | HOWTO(R_68K_PLT32, 0, 2,32, true, 0, complain_overflow_signed, bfd_elf_generic_reloc, "R_68K_PLT32", false, 0xffffffff, 0xffffffff,true), | |
93 | HOWTO(R_68K_PLT16, 0, 1,16, true, 0, complain_overflow_signed, bfd_elf_generic_reloc, "R_68K_PLT16", false, 0x0000ffff, 0x0000ffff,true), | |
94 | HOWTO(R_68K_PLT8, 0, 0, 8, true, 0, complain_overflow_signed, bfd_elf_generic_reloc, "R_68K_PLT8", false, 0x000000ff, 0x000000ff,true), | |
95 | HOWTO(R_68K_PLT32O, 0, 2,32, false,0, complain_overflow_signed, bfd_elf_generic_reloc, "R_68K_PLT32O", false, 0xffffffff, 0xffffffff,false), | |
96 | HOWTO(R_68K_PLT16O, 0, 1,16, false,0, complain_overflow_signed, bfd_elf_generic_reloc, "R_68K_PLT16O", false, 0x0000ffff, 0x0000ffff,false), | |
97 | HOWTO(R_68K_PLT8O, 0, 0, 8, false,0, complain_overflow_signed, bfd_elf_generic_reloc, "R_68K_PLT8O", false, 0x000000ff, 0x000000ff,false), | |
98 | HOWTO(R_68K_COPY, 0, 0, 0, false,0, complain_overflow_dont, bfd_elf_generic_reloc, "R_68K_COPY", false, 0xffffffff, 0xffffffff,false), | |
99 | HOWTO(R_68K_GLOB_DAT, 0, 2,32, false,0, complain_overflow_dont, bfd_elf_generic_reloc, "R_68K_GLOB_DAT", false, 0xffffffff, 0xffffffff,false), | |
100 | HOWTO(R_68K_JMP_SLOT, 0, 2,32, false,0, complain_overflow_dont, bfd_elf_generic_reloc, "R_68K_JMP_SLOT", false, 0xffffffff, 0xffffffff,false), | |
101 | HOWTO(R_68K_RELATIVE, 0, 2,32, false,0, complain_overflow_dont, bfd_elf_generic_reloc, "R_68K_RELATIVE", false, 0xffffffff, 0xffffffff,false), | |
102 | }; | |
103 | ||
104 | static void | |
105 | rtype_to_howto (abfd, cache_ptr, dst) | |
106 | bfd *abfd; | |
107 | arelent *cache_ptr; | |
108 | Elf_Internal_Rela *dst; | |
109 | { | |
110 | BFD_ASSERT (ELF32_R_TYPE(dst->r_info) < (unsigned int) R_68K__max); | |
111 | cache_ptr->howto = &howto_table[ELF32_R_TYPE(dst->r_info)]; | |
112 | } | |
113 | ||
114 | static void | |
115 | rtype_to_howto_rel (abfd, cache_ptr, dst) | |
116 | bfd *abfd; | |
117 | arelent *cache_ptr; | |
118 | Elf_Internal_Rel *dst; | |
119 | { | |
120 | BFD_ASSERT (ELF32_R_TYPE(dst->r_info) < (unsigned int) R_68K__max); | |
121 | cache_ptr->howto = &howto_table[ELF32_R_TYPE(dst->r_info)]; | |
122 | } | |
123 | ||
124 | #define elf_info_to_howto rtype_to_howto | |
125 | #define elf_info_to_howto_rel rtype_to_howto_rel | |
126 | ||
127 | static const struct { unsigned char bfd_val, elf_val; } reloc_map[] = { | |
128 | { BFD_RELOC_NONE, R_68K_NONE }, | |
129 | { BFD_RELOC_32, R_68K_32 }, | |
130 | { BFD_RELOC_16, R_68K_16 }, | |
131 | { BFD_RELOC_8, R_68K_8 }, | |
132 | { BFD_RELOC_32_PCREL, R_68K_PC32 }, | |
133 | { BFD_RELOC_16_PCREL, R_68K_PC16 }, | |
134 | { BFD_RELOC_8_PCREL, R_68K_PC8 }, | |
135 | { BFD_RELOC_32_GOT_PCREL, R_68K_GOT32 }, | |
136 | { BFD_RELOC_16_GOT_PCREL, R_68K_GOT16 }, | |
137 | { BFD_RELOC_8_GOT_PCREL, R_68K_GOT8 }, | |
138 | { BFD_RELOC_32_GOTOFF, R_68K_GOT32O }, | |
139 | { BFD_RELOC_16_GOTOFF, R_68K_GOT16O }, | |
140 | { BFD_RELOC_8_GOTOFF, R_68K_GOT8O }, | |
141 | { BFD_RELOC_32_PLT_PCREL, R_68K_PLT32 }, | |
142 | { BFD_RELOC_16_PLT_PCREL, R_68K_PLT16 }, | |
143 | { BFD_RELOC_8_PLT_PCREL, R_68K_PLT8 }, | |
144 | { BFD_RELOC_32_PLTOFF, R_68K_PLT32O }, | |
145 | { BFD_RELOC_16_PLTOFF, R_68K_PLT16O }, | |
146 | { BFD_RELOC_8_PLTOFF, R_68K_PLT8O }, | |
147 | { BFD_RELOC_NONE, R_68K_COPY }, | |
148 | { BFD_RELOC_68K_GLOB_DAT, R_68K_GLOB_DAT }, | |
149 | { BFD_RELOC_68K_JMP_SLOT, R_68K_JMP_SLOT }, | |
150 | { BFD_RELOC_68K_RELATIVE, R_68K_RELATIVE }, | |
151 | { BFD_RELOC_CTOR, R_68K_32 }, | |
152 | }; | |
153 | ||
154 | static reloc_howto_type * | |
155 | reloc_type_lookup (abfd, code) | |
156 | bfd *abfd; | |
157 | bfd_reloc_code_real_type code; | |
158 | { | |
159 | int i; | |
160 | for (i = 0; i < sizeof (reloc_map) / sizeof (reloc_map[0]); i++) | |
161 | { | |
162 | if (reloc_map[i].bfd_val == code) | |
163 | return &howto_table[(int) reloc_map[i].elf_val]; | |
164 | } | |
165 | return 0; | |
166 | } | |
167 | ||
168 | #define bfd_elf32_bfd_reloc_type_lookup reloc_type_lookup | |
169 | #define ELF_ARCH bfd_arch_m68k | |
170 | /* end code generated by elf.el */ | |
171 | ||
172 | #define USE_RELA | |
173 | ||
174 | \f | |
175 | /* Functions for the m68k ELF linker. */ | |
176 | ||
177 | /* The name of the dynamic interpreter. This is put in the .interp | |
178 | section. */ | |
179 | ||
180 | #define ELF_DYNAMIC_INTERPRETER "/usr/lib/libc.so.1" | |
181 | ||
182 | /* The size in bytes of an entry in the procedure linkage table. */ | |
183 | ||
184 | #define PLT_ENTRY_SIZE 20 | |
185 | ||
186 | /* The first entry in a procedure linkage table looks like this. See | |
187 | the SVR4 ABI m68k supplement to see how this works. */ | |
188 | ||
189 | static const bfd_byte elf_m68k_plt0_entry[PLT_ENTRY_SIZE] = | |
190 | { | |
191 | 0x2f, 0x3b, 0x01, 0x70, /* move.l (%pc,addr),-(%sp) */ | |
192 | 0, 0, 0, 0, /* replaced with address of .got + 4. */ | |
193 | 0x4e, 0xfb, 0x01, 0x71, /* jmp ([%pc,addr]) */ | |
194 | 0, 0, 0, 0, /* replaced with address of .got + 8. */ | |
195 | 0, 0, 0, 0 /* pad out to 20 bytes. */ | |
196 | }; | |
197 | ||
198 | /* Subsequent entries in a procedure linkage table look like this. */ | |
199 | ||
200 | static const bfd_byte elf_m68k_plt_entry[PLT_ENTRY_SIZE] = | |
201 | { | |
202 | 0x4e, 0xfb, 0x01, 0x71, /* jmp ([addr]) */ | |
203 | 0, 0, 0, 0, /* replaced with address of this symbol in .got. */ | |
204 | 0x2f, 0x3c, /* move.l #offset,-(%sp) */ | |
205 | 0, 0, 0, 0, /* replaced with offset into relocation table. */ | |
206 | 0x60, 0xff, /* bra.l .plt */ | |
207 | 0, 0, 0, 0 /* replaced with offset to start of .plt. */ | |
208 | }; | |
209 | ||
30dc85f1 ILT |
210 | /* Look through the relocs for a section during the first phase, and |
211 | allocate space in the global offset table or procedure linkage | |
212 | table. */ | |
213 | ||
214 | static boolean | |
215 | elf_m68k_check_relocs (abfd, info, sec, relocs) | |
216 | bfd *abfd; | |
217 | struct bfd_link_info *info; | |
218 | asection *sec; | |
219 | const Elf_Internal_Rela *relocs; | |
220 | { | |
221 | bfd *dynobj; | |
222 | Elf_Internal_Shdr *symtab_hdr; | |
223 | struct elf_link_hash_entry **sym_hashes; | |
224 | bfd_vma *local_got_offsets; | |
225 | const Elf_Internal_Rela *rel; | |
226 | const Elf_Internal_Rela *rel_end; | |
227 | asection *sgot; | |
228 | asection *srelgot; | |
229 | asection *sreloc; | |
230 | ||
231 | if (info->relocateable) | |
232 | return true; | |
233 | ||
234 | dynobj = elf_hash_table (info)->dynobj; | |
235 | symtab_hdr = &elf_tdata (abfd)->symtab_hdr; | |
236 | sym_hashes = elf_sym_hashes (abfd); | |
237 | local_got_offsets = elf_local_got_offsets (abfd); | |
238 | ||
239 | sgot = NULL; | |
240 | srelgot = NULL; | |
241 | sreloc = NULL; | |
242 | ||
243 | rel_end = relocs + sec->reloc_count; | |
244 | for (rel = relocs; rel < rel_end; rel++) | |
245 | { | |
246 | long r_symndx; | |
247 | struct elf_link_hash_entry *h; | |
248 | ||
249 | r_symndx = ELF32_R_SYM (rel->r_info); | |
250 | ||
251 | if (r_symndx < symtab_hdr->sh_info) | |
252 | h = NULL; | |
253 | else | |
254 | h = sym_hashes[r_symndx - symtab_hdr->sh_info]; | |
255 | ||
256 | switch (ELF32_R_TYPE (rel->r_info)) | |
257 | { | |
258 | case R_68K_GOT8: | |
259 | case R_68K_GOT16: | |
260 | case R_68K_GOT32: | |
261 | case R_68K_GOT8O: | |
262 | case R_68K_GOT16O: | |
263 | case R_68K_GOT32O: | |
264 | /* This symbol requires a global offset table entry. */ | |
265 | ||
266 | if (h != NULL | |
267 | && strcmp (h->root.root.string, "_GLOBAL_OFFSET_TABLE_") == 0) | |
268 | break; | |
269 | ||
270 | if (dynobj == NULL) | |
271 | { | |
272 | /* Create the .got section. */ | |
273 | elf_hash_table (info)->dynobj = dynobj = abfd; | |
ede4eed4 | 274 | if (!_bfd_elf_create_got_section (dynobj, info)) |
30dc85f1 ILT |
275 | return false; |
276 | } | |
277 | ||
278 | if (sgot == NULL) | |
279 | { | |
280 | sgot = bfd_get_section_by_name (dynobj, ".got"); | |
281 | BFD_ASSERT (sgot != NULL); | |
282 | } | |
283 | ||
284 | if (srelgot == NULL | |
285 | && (h != NULL || info->shared)) | |
286 | { | |
287 | srelgot = bfd_get_section_by_name (dynobj, ".rela.got"); | |
288 | if (srelgot == NULL) | |
289 | { | |
290 | srelgot = bfd_make_section (dynobj, ".rela.got"); | |
291 | if (srelgot == NULL | |
292 | || !bfd_set_section_flags (dynobj, srelgot, | |
293 | (SEC_ALLOC | |
294 | | SEC_LOAD | |
295 | | SEC_HAS_CONTENTS | |
296 | | SEC_IN_MEMORY | |
297 | | SEC_READONLY)) | |
298 | || !bfd_set_section_alignment (dynobj, srelgot, 2)) | |
299 | return false; | |
300 | } | |
301 | } | |
302 | ||
303 | if (h != NULL) | |
304 | { | |
305 | if (h->got_offset != (bfd_vma) -1) | |
306 | { | |
307 | /* We have already allocated space in the .got. */ | |
308 | break; | |
309 | } | |
310 | h->got_offset = sgot->_raw_size; | |
311 | ||
312 | /* Make sure this symbol is output as a dynamic symbol. */ | |
313 | if (h->dynindx == -1) | |
314 | { | |
315 | if (!bfd_elf32_link_record_dynamic_symbol (info, h)) | |
316 | return false; | |
317 | } | |
318 | ||
319 | srelgot->_raw_size += sizeof (Elf32_External_Rela); | |
320 | } | |
321 | else | |
322 | { | |
323 | /* This is a global offset table entry for a local | |
324 | symbol. */ | |
325 | if (local_got_offsets == NULL) | |
326 | { | |
327 | size_t size; | |
328 | register int i; | |
329 | ||
330 | size = symtab_hdr->sh_info * sizeof (bfd_vma); | |
331 | local_got_offsets = (bfd_vma *) bfd_alloc (abfd, size); | |
332 | if (local_got_offsets == NULL) | |
333 | { | |
334 | bfd_set_error (bfd_error_no_memory); | |
335 | return false; | |
336 | } | |
337 | elf_local_got_offsets (abfd) = local_got_offsets; | |
338 | for (i = 0; i < symtab_hdr->sh_info; i++) | |
339 | local_got_offsets[i] = (bfd_vma) -1; | |
340 | } | |
341 | if (local_got_offsets[r_symndx] != (bfd_vma) -1) | |
342 | { | |
343 | /* We have already allocated space in the .got. */ | |
344 | break; | |
345 | } | |
346 | local_got_offsets[r_symndx] = sgot->_raw_size; | |
347 | ||
348 | if (info->shared) | |
349 | { | |
350 | /* If we are generating a shared object, we need to | |
351 | output a R_68K_RELATIVE reloc so that the dynamic | |
352 | linker can adjust this GOT entry. */ | |
353 | srelgot->_raw_size += sizeof (Elf32_External_Rela); | |
354 | } | |
355 | } | |
356 | ||
357 | sgot->_raw_size += 4; | |
358 | break; | |
359 | ||
360 | case R_68K_PLT8: | |
361 | case R_68K_PLT16: | |
362 | case R_68K_PLT32: | |
363 | case R_68K_PLT8O: | |
364 | case R_68K_PLT16O: | |
365 | case R_68K_PLT32O: | |
366 | /* This symbol requires a procedure linkage table entry. We | |
367 | actually build the entry in adjust_dynamic_symbol, | |
368 | because this might be a case of linking PIC code without | |
369 | linking in any dynamic objects, in which case we don't | |
370 | need to generate a procedure linkage table after all. */ | |
371 | ||
372 | /* If this is a local symbol, we resolve it directly without | |
373 | creating a procedure linkage table entry. */ | |
374 | if (h == NULL) | |
375 | continue; | |
376 | ||
377 | /* Make sure this symbol is output as a dynamic symbol. */ | |
378 | if (h->dynindx == -1) | |
379 | { | |
380 | if (!bfd_elf32_link_record_dynamic_symbol (info, h)) | |
381 | return false; | |
382 | } | |
383 | ||
384 | h->elf_link_hash_flags |= ELF_LINK_HASH_NEEDS_PLT; | |
385 | break; | |
386 | ||
387 | case R_68K_8: | |
388 | case R_68K_16: | |
389 | case R_68K_32: | |
390 | case R_68K_PC8: | |
391 | case R_68K_PC16: | |
392 | case R_68K_PC32: | |
393 | if (info->shared | |
394 | && (sec->flags & SEC_ALLOC) != 0) | |
395 | { | |
396 | /* When creating a shared object, we must copy these | |
397 | reloc types into the output file. We create a reloc | |
398 | section in dynobj and make room for this reloc. */ | |
399 | if (sreloc == NULL) | |
400 | { | |
401 | const char *name; | |
402 | ||
ede4eed4 | 403 | name = (bfd_elf_string_from_elf_section |
30dc85f1 ILT |
404 | (abfd, |
405 | elf_elfheader (abfd)->e_shstrndx, | |
406 | elf_section_data (sec)->rel_hdr.sh_name)); | |
407 | if (name == NULL) | |
408 | return false; | |
409 | ||
410 | BFD_ASSERT (strncmp (name, ".rela", 5) == 0 | |
411 | && strcmp (bfd_get_section_name (abfd, sec), | |
412 | name + 5) == 0); | |
413 | ||
414 | sreloc = bfd_get_section_by_name (dynobj, name); | |
415 | if (sreloc == NULL) | |
416 | { | |
417 | sreloc = bfd_make_section (dynobj, name); | |
418 | if (sreloc == NULL | |
419 | || !bfd_set_section_flags (dynobj, sreloc, | |
420 | (SEC_ALLOC | |
421 | | SEC_LOAD | |
422 | | SEC_HAS_CONTENTS | |
423 | | SEC_IN_MEMORY | |
424 | | SEC_READONLY)) | |
425 | || !bfd_set_section_alignment (dynobj, sreloc, 2)) | |
426 | return false; | |
427 | } | |
428 | } | |
429 | ||
430 | sreloc->_raw_size += sizeof (Elf32_External_Rela); | |
431 | } | |
432 | ||
433 | break; | |
434 | ||
435 | default: | |
436 | break; | |
437 | } | |
438 | } | |
439 | ||
440 | return true; | |
441 | } | |
442 | ||
443 | /* Adjust a symbol defined by a dynamic object and referenced by a | |
444 | regular object. The current definition is in some section of the | |
445 | dynamic object, but we're not including those sections. We have to | |
446 | change the definition to something the rest of the link can | |
447 | understand. */ | |
448 | ||
449 | static boolean | |
450 | elf_m68k_adjust_dynamic_symbol (info, h) | |
451 | struct bfd_link_info *info; | |
452 | struct elf_link_hash_entry *h; | |
453 | { | |
454 | bfd *dynobj; | |
455 | asection *s; | |
456 | unsigned int power_of_two; | |
457 | ||
458 | dynobj = elf_hash_table (info)->dynobj; | |
459 | ||
460 | /* Make sure we know what is going on here. */ | |
3004a68c ILT |
461 | BFD_ASSERT (dynobj != NULL |
462 | && ((h->elf_link_hash_flags & ELF_LINK_HASH_NEEDS_PLT) | |
463 | || ((h->elf_link_hash_flags | |
464 | & ELF_LINK_HASH_DEF_DYNAMIC) != 0 | |
465 | && (h->elf_link_hash_flags | |
466 | & ELF_LINK_HASH_REF_REGULAR) != 0 | |
467 | && (h->elf_link_hash_flags | |
468 | & ELF_LINK_HASH_DEF_REGULAR) == 0))); | |
30dc85f1 ILT |
469 | |
470 | /* If this is a function, put it in the procedure linkage table. We | |
471 | will fill in the contents of the procedure linkage table later, | |
472 | when we know the address of the .got section. */ | |
473 | if (h->type == STT_FUNC | |
474 | || (h->elf_link_hash_flags & ELF_LINK_HASH_NEEDS_PLT) != 0) | |
475 | { | |
476 | if (!elf_hash_table (info)->dynamic_sections_created) | |
477 | { | |
478 | /* This case can occur if we saw a PLT32 reloc in an input | |
479 | file, but none of the input files were dynamic objects. | |
480 | In such a case, we don't actually need to build a | |
481 | procedure linkage table, and we can just do a PC32 reloc | |
482 | instead. */ | |
483 | BFD_ASSERT ((h->elf_link_hash_flags & ELF_LINK_HASH_NEEDS_PLT) != 0); | |
484 | return true; | |
485 | } | |
486 | ||
487 | s = bfd_get_section_by_name (dynobj, ".plt"); | |
488 | BFD_ASSERT (s != NULL); | |
489 | ||
490 | /* If this is the first .plt entry, make room for the special | |
491 | first entry. */ | |
492 | if (s->_raw_size == 0) | |
493 | s->_raw_size += PLT_ENTRY_SIZE; | |
494 | ||
495 | /* If this symbol is not defined in a regular file, and we are | |
496 | not generating a shared library, then set the symbol to this | |
497 | location in the .plt. This is required to make function | |
498 | pointers compare as equal between the normal executable and | |
499 | the shared library. */ | |
500 | if (!info->shared | |
501 | && (h->elf_link_hash_flags & ELF_LINK_HASH_DEF_REGULAR) == 0) | |
502 | { | |
503 | h->root.u.def.section = s; | |
504 | h->root.u.def.value = s->_raw_size; | |
505 | } | |
506 | ||
507 | h->plt_offset = s->_raw_size; | |
508 | ||
509 | /* Make room for this entry. */ | |
510 | s->_raw_size += PLT_ENTRY_SIZE; | |
511 | ||
512 | /* We also need to make an entry in the .got.plt section, which | |
513 | will be placed in the .got section by the linker script. */ | |
514 | ||
515 | s = bfd_get_section_by_name (dynobj, ".got.plt"); | |
516 | BFD_ASSERT (s != NULL); | |
517 | s->_raw_size += 4; | |
518 | ||
519 | /* We also need to make an entry in the .rela.plt section. */ | |
520 | ||
521 | s = bfd_get_section_by_name (dynobj, ".rela.plt"); | |
522 | BFD_ASSERT (s != NULL); | |
523 | s->_raw_size += sizeof (Elf32_External_Rela); | |
524 | ||
525 | return true; | |
526 | } | |
527 | ||
528 | /* If this is a weak symbol, and there is a real definition, the | |
529 | processor independent code will have arranged for us to see the | |
530 | real definition first, and we can just use the same value. */ | |
531 | if (h->weakdef != NULL) | |
532 | { | |
533 | BFD_ASSERT (h->weakdef->root.type == bfd_link_hash_defined | |
534 | || h->weakdef->root.type == bfd_link_hash_defweak); | |
535 | h->root.u.def.section = h->weakdef->root.u.def.section; | |
536 | h->root.u.def.value = h->weakdef->root.u.def.value; | |
537 | return true; | |
538 | } | |
539 | ||
540 | /* This is a reference to a symbol defined by a dynamic object which | |
541 | is not a function. */ | |
542 | ||
543 | /* If we are creating a shared library, we must presume that the | |
544 | only references to the symbol are via the global offset table. | |
545 | For such cases we need not do anything here; the relocations will | |
546 | be handled correctly by relocate_section. */ | |
547 | if (info->shared) | |
548 | return true; | |
549 | ||
550 | /* We must allocate the symbol in our .dynbss section, which will | |
551 | become part of the .bss section of the executable. There will be | |
552 | an entry for this symbol in the .dynsym section. The dynamic | |
553 | object will contain position independent code, so all references | |
554 | from the dynamic object to this symbol will go through the global | |
555 | offset table. The dynamic linker will use the .dynsym entry to | |
556 | determine the address it must put in the global offset table, so | |
557 | both the dynamic object and the regular object will refer to the | |
558 | same memory location for the variable. */ | |
559 | ||
560 | s = bfd_get_section_by_name (dynobj, ".dynbss"); | |
561 | BFD_ASSERT (s != NULL); | |
562 | ||
563 | /* If the symbol is currently defined in the .bss section of the | |
564 | dynamic object, then it is OK to simply initialize it to zero. | |
565 | If the symbol is in some other section, we must generate a | |
566 | R_68K_COPY reloc to tell the dynamic linker to copy the initial | |
567 | value out of the dynamic object and into the runtime process | |
568 | image. We need to remember the offset into the .rela.bss section | |
569 | we are going to use. */ | |
570 | if ((h->root.u.def.section->flags & SEC_LOAD) != 0) | |
571 | { | |
572 | asection *srel; | |
573 | ||
574 | srel = bfd_get_section_by_name (dynobj, ".rela.bss"); | |
575 | BFD_ASSERT (srel != NULL); | |
576 | srel->_raw_size += sizeof (Elf32_External_Rela); | |
577 | h->elf_link_hash_flags |= ELF_LINK_HASH_NEEDS_COPY; | |
578 | } | |
579 | ||
580 | /* We need to figure out the alignment required for this symbol. I | |
581 | have no idea how ELF linkers handle this. */ | |
582 | power_of_two = bfd_log2 (h->size); | |
583 | if (power_of_two > 3) | |
584 | power_of_two = 3; | |
585 | ||
586 | /* Apply the required alignment. */ | |
587 | s->_raw_size = BFD_ALIGN (s->_raw_size, | |
588 | (bfd_size_type) (1 << power_of_two)); | |
589 | if (power_of_two > bfd_get_section_alignment (dynobj, s)) | |
590 | { | |
591 | if (!bfd_set_section_alignment (dynobj, s, power_of_two)) | |
592 | return false; | |
593 | } | |
594 | ||
595 | /* Define the symbol as being at this point in the section. */ | |
596 | h->root.u.def.section = s; | |
597 | h->root.u.def.value = s->_raw_size; | |
598 | ||
599 | /* Increment the section size to make room for the symbol. */ | |
600 | s->_raw_size += h->size; | |
601 | ||
602 | return true; | |
603 | } | |
604 | ||
605 | /* Set the sizes of the dynamic sections. */ | |
606 | ||
607 | static boolean | |
608 | elf_m68k_size_dynamic_sections (output_bfd, info) | |
609 | bfd *output_bfd; | |
610 | struct bfd_link_info *info; | |
611 | { | |
612 | bfd *dynobj; | |
613 | asection *s; | |
614 | boolean plt; | |
615 | boolean relocs; | |
616 | boolean reltext; | |
617 | ||
618 | dynobj = elf_hash_table (info)->dynobj; | |
619 | BFD_ASSERT (dynobj != NULL); | |
620 | ||
621 | if (elf_hash_table (info)->dynamic_sections_created) | |
622 | { | |
623 | /* Set the contents of the .interp section to the interpreter. */ | |
624 | if (!info->shared) | |
625 | { | |
626 | s = bfd_get_section_by_name (dynobj, ".interp"); | |
627 | BFD_ASSERT (s != NULL); | |
628 | s->_raw_size = sizeof ELF_DYNAMIC_INTERPRETER; | |
629 | s->contents = (unsigned char *) ELF_DYNAMIC_INTERPRETER; | |
630 | } | |
631 | } | |
632 | else | |
633 | { | |
634 | /* We may have created entries in the .rela.got section. | |
635 | However, if we are not creating the dynamic sections, we will | |
636 | not actually use these entries. Reset the size of .rela.got, | |
637 | which will cause it to get stripped from the output file | |
638 | below. */ | |
639 | s = bfd_get_section_by_name (dynobj, ".rela.got"); | |
640 | if (s != NULL) | |
641 | s->_raw_size = 0; | |
642 | } | |
643 | ||
644 | /* The check_relocs and adjust_dynamic_symbol entry points have | |
645 | determined the sizes of the various dynamic sections. Allocate | |
646 | memory for them. */ | |
647 | plt = false; | |
648 | relocs = false; | |
649 | reltext = false; | |
650 | for (s = dynobj->sections; s != NULL; s = s->next) | |
651 | { | |
652 | const char *name; | |
653 | boolean strip; | |
654 | ||
655 | if ((s->flags & SEC_IN_MEMORY) == 0) | |
656 | continue; | |
657 | ||
658 | /* It's OK to base decisions on the section name, because none | |
659 | of the dynobj section names depend upon the input files. */ | |
660 | name = bfd_get_section_name (dynobj, s); | |
661 | ||
662 | strip = false; | |
663 | ||
664 | if (strcmp (name, ".plt") == 0) | |
665 | { | |
666 | if (s->_raw_size == 0) | |
667 | { | |
668 | /* Strip this section if we don't need it; see the | |
669 | comment below. */ | |
670 | strip = true; | |
671 | } | |
672 | else | |
673 | { | |
674 | /* Remember whether there is a PLT. */ | |
675 | plt = true; | |
676 | } | |
677 | } | |
678 | else if (strncmp (name, ".rela", 5) == 0) | |
679 | { | |
680 | if (s->_raw_size == 0) | |
681 | { | |
682 | /* If we don't need this section, strip it from the | |
683 | output file. This is mostly to handle .rela.bss and | |
684 | .rela.plt. We must create both sections in | |
685 | create_dynamic_sections, because they must be created | |
686 | before the linker maps input sections to output | |
687 | sections. The linker does that before | |
688 | adjust_dynamic_symbol is called, and it is that | |
689 | function which decides whether anything needs to go | |
690 | into these sections. */ | |
691 | strip = true; | |
692 | } | |
693 | else | |
694 | { | |
695 | asection *target; | |
696 | ||
697 | /* Remember whether there are any reloc sections other | |
698 | than .rela.plt. */ | |
699 | if (strcmp (name, ".rela.plt") != 0) | |
700 | { | |
701 | relocs = true; | |
702 | ||
703 | /* If this relocation section applies to a read only | |
704 | section, then we probably need a DT_TEXTREL | |
705 | entry. .rela.plt is actually associated with | |
706 | .got.plt, which is never readonly. */ | |
707 | target = bfd_get_section_by_name (output_bfd, name + 5); | |
708 | if (target != NULL | |
709 | && (target->flags & SEC_READONLY) != 0) | |
710 | reltext = true; | |
711 | } | |
712 | ||
713 | /* We use the reloc_count field as a counter if we need | |
714 | to copy relocs into the output file. */ | |
715 | s->reloc_count = 0; | |
716 | } | |
717 | } | |
718 | else if (strncmp (name, ".got", 4) != 0) | |
719 | { | |
720 | /* It's not one of our sections, so don't allocate space. */ | |
721 | continue; | |
722 | } | |
723 | ||
724 | if (strip) | |
725 | { | |
726 | asection **spp; | |
727 | ||
728 | for (spp = &s->output_section->owner->sections; | |
729 | *spp != s->output_section; | |
730 | spp = &(*spp)->next) | |
731 | ; | |
732 | *spp = s->output_section->next; | |
733 | --s->output_section->owner->section_count; | |
734 | ||
735 | continue; | |
736 | } | |
737 | ||
738 | /* Allocate memory for the section contents. */ | |
739 | s->contents = (bfd_byte *) bfd_alloc (dynobj, s->_raw_size); | |
740 | if (s->contents == NULL && s->_raw_size != 0) | |
741 | { | |
742 | bfd_set_error (bfd_error_no_memory); | |
743 | return false; | |
744 | } | |
745 | } | |
746 | ||
747 | if (elf_hash_table (info)->dynamic_sections_created) | |
748 | { | |
749 | /* Add some entries to the .dynamic section. We fill in the | |
750 | values later, in elf_m68k_finish_dynamic_sections, but we | |
751 | must add the entries now so that we get the correct size for | |
752 | the .dynamic section. The DT_DEBUG entry is filled in by the | |
753 | dynamic linker and used by the debugger. */ | |
754 | if (!info->shared) | |
755 | { | |
756 | if (!bfd_elf32_add_dynamic_entry (info, DT_DEBUG, 0)) | |
757 | return false; | |
758 | } | |
759 | ||
760 | if (plt) | |
761 | { | |
762 | if (!bfd_elf32_add_dynamic_entry (info, DT_PLTGOT, 0) | |
763 | || !bfd_elf32_add_dynamic_entry (info, DT_PLTRELSZ, 0) | |
764 | || !bfd_elf32_add_dynamic_entry (info, DT_PLTREL, DT_RELA) | |
765 | || !bfd_elf32_add_dynamic_entry (info, DT_JMPREL, 0)) | |
766 | return false; | |
767 | } | |
768 | ||
769 | if (relocs) | |
770 | { | |
771 | if (!bfd_elf32_add_dynamic_entry (info, DT_RELA, 0) | |
772 | || !bfd_elf32_add_dynamic_entry (info, DT_RELASZ, 0) | |
773 | || !bfd_elf32_add_dynamic_entry (info, DT_RELAENT, | |
774 | sizeof (Elf32_External_Rela))) | |
775 | return false; | |
776 | } | |
777 | ||
778 | if (reltext) | |
779 | { | |
780 | if (!bfd_elf32_add_dynamic_entry (info, DT_TEXTREL, 0)) | |
781 | return false; | |
782 | } | |
783 | } | |
784 | ||
785 | /* If we are generating a shared library, we generate a section | |
786 | symbol for each output section. These are local symbols, which | |
787 | means that they must come first in the dynamic symbol table. | |
788 | That means we must increment the dynamic symbol index of every | |
789 | other dynamic symbol. */ | |
790 | if (info->shared) | |
791 | { | |
792 | int c, i; | |
793 | ||
794 | c = bfd_count_sections (output_bfd); | |
795 | elf_link_hash_traverse (elf_hash_table (info), | |
796 | elf_m68k_adjust_dynindx, | |
797 | (PTR) &c); | |
798 | elf_hash_table (info)->dynsymcount += c; | |
799 | ||
800 | for (i = 1, s = output_bfd->sections; s != NULL; s = s->next, i++) | |
801 | { | |
802 | elf_section_data (s)->dynindx = i; | |
803 | /* These symbols will have no names, so we don't need to | |
804 | fiddle with dynstr_index. */ | |
805 | } | |
806 | } | |
807 | ||
808 | return true; | |
809 | } | |
810 | ||
811 | /* Increment the index of a dynamic symbol by a given amount. Called | |
812 | via elf_link_hash_traverse. */ | |
813 | ||
814 | static boolean | |
815 | elf_m68k_adjust_dynindx (h, cparg) | |
816 | struct elf_link_hash_entry *h; | |
817 | PTR cparg; | |
818 | { | |
819 | int *cp = (int *) cparg; | |
820 | ||
821 | if (h->dynindx != -1) | |
822 | h->dynindx += *cp; | |
823 | return true; | |
824 | } | |
825 | ||
826 | /* Relocate an M68K ELF section. */ | |
827 | ||
828 | static boolean | |
829 | elf_m68k_relocate_section (output_bfd, info, input_bfd, input_section, | |
830 | contents, relocs, local_syms, local_sections) | |
831 | bfd *output_bfd; | |
832 | struct bfd_link_info *info; | |
833 | bfd *input_bfd; | |
834 | asection *input_section; | |
835 | bfd_byte *contents; | |
836 | Elf_Internal_Rela *relocs; | |
837 | Elf_Internal_Sym *local_syms; | |
838 | asection **local_sections; | |
839 | { | |
840 | bfd *dynobj; | |
841 | Elf_Internal_Shdr *symtab_hdr; | |
842 | struct elf_link_hash_entry **sym_hashes; | |
843 | bfd_vma *local_got_offsets; | |
844 | asection *sgot; | |
845 | asection *sgotplt; | |
846 | asection *splt; | |
847 | asection *sreloc; | |
848 | Elf_Internal_Rela *rel; | |
849 | Elf_Internal_Rela *relend; | |
850 | ||
851 | dynobj = elf_hash_table (info)->dynobj; | |
852 | symtab_hdr = &elf_tdata (input_bfd)->symtab_hdr; | |
853 | sym_hashes = elf_sym_hashes (input_bfd); | |
854 | local_got_offsets = elf_local_got_offsets (input_bfd); | |
855 | ||
856 | sgot = NULL; | |
857 | sgotplt = NULL; | |
858 | splt = NULL; | |
859 | sreloc = NULL; | |
860 | ||
861 | rel = relocs; | |
862 | relend = relocs + input_section->reloc_count; | |
863 | for (; rel < relend; rel++) | |
864 | { | |
865 | int r_type; | |
866 | reloc_howto_type *howto; | |
867 | long r_symndx; | |
868 | struct elf_link_hash_entry *h; | |
869 | Elf_Internal_Sym *sym; | |
870 | asection *sec; | |
871 | bfd_vma relocation; | |
872 | bfd_reloc_status_type r; | |
873 | ||
874 | r_type = ELF32_R_TYPE (rel->r_info); | |
875 | if (r_type < 0 || r_type >= (int) R_68K__max) | |
876 | { | |
877 | bfd_set_error (bfd_error_bad_value); | |
878 | return false; | |
879 | } | |
880 | howto = howto_table + r_type; | |
881 | ||
882 | r_symndx = ELF32_R_SYM (rel->r_info); | |
883 | ||
884 | if (info->relocateable) | |
885 | { | |
886 | /* This is a relocateable link. We don't have to change | |
887 | anything, unless the reloc is against a section symbol, | |
888 | in which case we have to adjust according to where the | |
889 | section symbol winds up in the output section. */ | |
890 | if (r_symndx < symtab_hdr->sh_info) | |
891 | { | |
892 | sym = local_syms + r_symndx; | |
893 | if (ELF_ST_TYPE (sym->st_info) == STT_SECTION) | |
894 | { | |
895 | sec = local_sections[r_symndx]; | |
896 | rel->r_addend += sec->output_offset + sym->st_value; | |
897 | } | |
898 | } | |
899 | ||
900 | continue; | |
901 | } | |
902 | ||
903 | /* This is a final link. */ | |
904 | h = NULL; | |
905 | sym = NULL; | |
906 | sec = NULL; | |
907 | if (r_symndx < symtab_hdr->sh_info) | |
908 | { | |
909 | sym = local_syms + r_symndx; | |
910 | sec = local_sections[r_symndx]; | |
911 | relocation = (sec->output_section->vma | |
912 | + sec->output_offset | |
913 | + sym->st_value); | |
914 | } | |
915 | else | |
916 | { | |
917 | h = sym_hashes[r_symndx - symtab_hdr->sh_info]; | |
918 | if (h->root.type == bfd_link_hash_defined | |
919 | || h->root.type == bfd_link_hash_defweak) | |
920 | { | |
921 | sec = h->root.u.def.section; | |
922 | if (((r_type == R_68K_PLT8 | |
923 | || r_type == R_68K_PLT16 | |
924 | || r_type == R_68K_PLT32 | |
925 | || r_type == R_68K_PLT8O | |
926 | || r_type == R_68K_PLT16O | |
927 | || r_type == R_68K_PLT32O) | |
928 | && h->plt_offset != (bfd_vma) -1) | |
929 | || ((r_type == R_68K_GOT8O | |
930 | || r_type == R_68K_GOT16O | |
931 | || r_type == R_68K_GOT32O | |
932 | || ((r_type == R_68K_GOT8 | |
933 | || r_type == R_68K_GOT16 | |
934 | || r_type == R_68K_GOT32) | |
935 | && strcmp (h->root.root.string, | |
936 | "_GLOBAL_OFFSET_TABLE_") != 0)) | |
937 | && elf_hash_table (info)->dynamic_sections_created) | |
938 | || (info->shared | |
939 | && (input_section->flags & SEC_ALLOC) != 0 | |
940 | && (r_type == R_68K_8 | |
941 | || r_type == R_68K_16 | |
942 | || r_type == R_68K_32 | |
943 | || r_type == R_68K_PC8 | |
944 | || r_type == R_68K_PC16 | |
945 | || r_type == R_68K_PC32))) | |
946 | { | |
947 | /* In these cases, we don't need the relocation | |
948 | value. We check specially because in some | |
949 | obscure cases sec->output_section will be NULL. */ | |
950 | relocation = 0; | |
951 | } | |
952 | else | |
953 | relocation = (h->root.u.def.value | |
954 | + sec->output_section->vma | |
955 | + sec->output_offset); | |
956 | } | |
957 | else if (h->root.type == bfd_link_hash_undefweak) | |
958 | relocation = 0; | |
959 | else if (info->shared) | |
960 | relocation = 0; | |
961 | else | |
962 | { | |
963 | if (!(info->callbacks->undefined_symbol | |
964 | (info, h->root.root.string, input_bfd, | |
965 | input_section, rel->r_offset))) | |
966 | return false; | |
967 | relocation = 0; | |
968 | } | |
969 | } | |
970 | ||
971 | switch (r_type) | |
972 | { | |
973 | case R_68K_GOT8: | |
974 | case R_68K_GOT16: | |
975 | case R_68K_GOT32: | |
976 | /* Relocation is to the entry for this symbol in the global | |
977 | offset table. */ | |
978 | if (h != NULL | |
979 | && strcmp (h->root.root.string, "_GLOBAL_OFFSET_TABLE_") == 0) | |
980 | break; | |
981 | /* Fall through. */ | |
982 | case R_68K_GOT8O: | |
983 | case R_68K_GOT16O: | |
984 | case R_68K_GOT32O: | |
985 | /* Relocation is the offset of the entry for this symbol in | |
986 | the global offset table. */ | |
987 | ||
988 | if (sgot == NULL) | |
989 | { | |
990 | sgot = bfd_get_section_by_name (dynobj, ".got"); | |
991 | BFD_ASSERT (sgot != NULL); | |
992 | } | |
993 | ||
994 | if (sgotplt == NULL) | |
995 | { | |
996 | sgotplt = bfd_get_section_by_name (dynobj, ".got.plt"); | |
997 | BFD_ASSERT (sgotplt != NULL); | |
998 | } | |
999 | ||
1000 | if (h != NULL) | |
1001 | { | |
1002 | bfd_vma off; | |
1003 | ||
1004 | off = h->got_offset; | |
1005 | BFD_ASSERT (off != (bfd_vma) -1); | |
1006 | ||
1007 | if (!elf_hash_table (info)->dynamic_sections_created) | |
1008 | { | |
1009 | /* This is actually a static link. We must | |
1010 | initialize this entry in the global offset table. | |
1011 | Since the offset must always be a multiple of 4, | |
1012 | we use the least significant bit to record | |
1013 | whether we have initialized it already. | |
1014 | ||
1015 | When doing a dynamic link, we create a .rela.got | |
1016 | relocation entry to initialize the value. This | |
1017 | is done in the finish_dynamic_symbol routine. */ | |
1018 | if ((off & 1) != 0) | |
1019 | off &= ~1; | |
1020 | else | |
1021 | { | |
1022 | bfd_put_32 (output_bfd, relocation, | |
1023 | sgot->contents + off); | |
1024 | h->got_offset |= 1; | |
1025 | } | |
1026 | } | |
1027 | ||
1028 | relocation = sgot->output_offset + off; | |
1029 | if (r_type == R_68K_GOT8O | |
1030 | || r_type == R_68K_GOT16O | |
1031 | || r_type == R_68K_GOT32O) | |
1032 | relocation -= sgotplt->output_offset; | |
1033 | } | |
1034 | else | |
1035 | { | |
1036 | bfd_vma off; | |
1037 | ||
1038 | BFD_ASSERT (local_got_offsets != NULL | |
1039 | && local_got_offsets[r_symndx] != (bfd_vma) -1); | |
1040 | ||
1041 | off = local_got_offsets[r_symndx]; | |
1042 | ||
1043 | /* The offset must always be a multiple of 4. We use | |
1044 | the least significant bit to record whether we have | |
1045 | already generated the necessary reloc. */ | |
1046 | if ((off & 1) != 0) | |
1047 | off &= ~1; | |
1048 | else | |
1049 | { | |
1050 | bfd_put_32 (output_bfd, relocation, sgot->contents + off); | |
1051 | ||
1052 | if (info->shared) | |
1053 | { | |
1054 | asection *srelgot; | |
1055 | Elf_Internal_Rela outrel; | |
1056 | ||
1057 | srelgot = bfd_get_section_by_name (dynobj, ".rela.got"); | |
1058 | BFD_ASSERT (srelgot != NULL); | |
1059 | ||
1060 | outrel.r_offset = (sgot->output_section->vma | |
1061 | + sgot->output_offset | |
1062 | + off); | |
1063 | outrel.r_info = ELF32_R_INFO (0, R_68K_RELATIVE); | |
1064 | outrel.r_addend = 0; | |
1065 | bfd_elf32_swap_reloca_out (output_bfd, &outrel, | |
1066 | (((Elf32_External_Rela *) | |
1067 | srelgot->contents) | |
1068 | + srelgot->reloc_count)); | |
1069 | ++srelgot->reloc_count; | |
1070 | } | |
1071 | ||
1072 | local_got_offsets[r_symndx] |= 1; | |
1073 | } | |
1074 | ||
1075 | relocation = sgot->output_offset + off; | |
1076 | if (r_type == R_68K_GOT8O | |
1077 | || r_type == R_68K_GOT16O | |
1078 | || r_type == R_68K_GOT32O) | |
1079 | relocation -= sgotplt->output_offset; | |
1080 | } | |
1081 | ||
1082 | break; | |
1083 | ||
1084 | case R_68K_PLT8: | |
1085 | case R_68K_PLT16: | |
1086 | case R_68K_PLT32: | |
1087 | /* Relocation is to the entry for this symbol in the | |
1088 | procedure linkage table. */ | |
1089 | ||
1090 | /* Resolve a PLT32 reloc against a local symbol directly, | |
1091 | without using the procedure linkage table. */ | |
1092 | if (h == NULL) | |
1093 | break; | |
1094 | ||
1095 | if (h->plt_offset == (bfd_vma) -1) | |
1096 | { | |
1097 | /* We didn't make a PLT entry for this symbol. This | |
1098 | happens when statically linking PIC code. */ | |
1099 | break; | |
1100 | } | |
1101 | ||
1102 | if (splt == NULL) | |
1103 | { | |
1104 | splt = bfd_get_section_by_name (dynobj, ".plt"); | |
1105 | BFD_ASSERT (splt != NULL); | |
1106 | } | |
1107 | ||
1108 | relocation = (splt->output_section->vma | |
1109 | + splt->output_offset | |
1110 | + h->plt_offset); | |
1111 | break; | |
1112 | ||
1113 | case R_68K_PLT8O: | |
1114 | case R_68K_PLT16O: | |
1115 | case R_68K_PLT32O: | |
1116 | /* Relocation is the offset of the entry for this symbol in | |
1117 | the procedure linkage table. */ | |
1118 | BFD_ASSERT (h != NULL); | |
1119 | ||
1120 | if (h->plt_offset == (bfd_vma) -1) | |
1121 | { | |
1122 | /* We didn't make a PLT entry for this symbol. This | |
1123 | happens when statically linking PIC code. */ | |
1124 | break; | |
1125 | } | |
1126 | ||
1127 | if (splt == NULL) | |
1128 | { | |
1129 | splt = bfd_get_section_by_name (dynobj, ".plt"); | |
1130 | BFD_ASSERT (splt != NULL); | |
1131 | } | |
1132 | ||
1133 | relocation = h->plt_offset; | |
1134 | break; | |
1135 | ||
1136 | case R_68K_8: | |
1137 | case R_68K_16: | |
1138 | case R_68K_32: | |
1139 | case R_68K_PC8: | |
1140 | case R_68K_PC16: | |
1141 | case R_68K_PC32: | |
1142 | if (info->shared | |
1143 | && (input_section->flags & SEC_ALLOC) != 0) | |
1144 | { | |
1145 | Elf_Internal_Rela outrel; | |
1146 | ||
1147 | /* When generating a shared object, these relocations | |
1148 | are copied into the output file to be resolved at run | |
1149 | time. */ | |
1150 | ||
1151 | if (sreloc == NULL) | |
1152 | { | |
1153 | const char *name; | |
1154 | ||
ede4eed4 | 1155 | name = (bfd_elf_string_from_elf_section |
30dc85f1 ILT |
1156 | (input_bfd, |
1157 | elf_elfheader (input_bfd)->e_shstrndx, | |
1158 | elf_section_data (input_section)->rel_hdr.sh_name)); | |
1159 | if (name == NULL) | |
1160 | return false; | |
1161 | ||
1162 | BFD_ASSERT (strncmp (name, ".rela", 5) == 0 | |
1163 | && strcmp (bfd_get_section_name (input_bfd, | |
1164 | input_section), | |
1165 | name + 5) == 0); | |
1166 | ||
1167 | sreloc = bfd_get_section_by_name (dynobj, name); | |
1168 | BFD_ASSERT (sreloc != NULL); | |
1169 | } | |
1170 | ||
1171 | outrel.r_offset = (rel->r_offset | |
1172 | + input_section->output_section->vma | |
1173 | + input_section->output_offset); | |
1174 | if (h != NULL) | |
1175 | { | |
1176 | BFD_ASSERT (h->dynindx != -1); | |
1177 | outrel.r_info = ELF32_R_INFO (h->dynindx, r_type); | |
1178 | outrel.r_addend = rel->r_addend; | |
1179 | } | |
1180 | else | |
1181 | { | |
1182 | if (r_type == R_68K_32) | |
1183 | { | |
1184 | outrel.r_info = ELF32_R_INFO (0, R_68K_RELATIVE); | |
1185 | outrel.r_addend = relocation + rel->r_addend; | |
1186 | } | |
1187 | else | |
1188 | { | |
1189 | long indx; | |
1190 | ||
1191 | sym = local_syms + r_symndx; | |
1192 | ||
1193 | BFD_ASSERT (ELF_ST_TYPE (sym->st_info) == STT_SECTION); | |
1194 | ||
1195 | sec = local_sections[r_symndx]; | |
1196 | if (sec != NULL && bfd_is_abs_section (sec)) | |
1197 | indx = 0; | |
1198 | else if (sec == NULL || sec->owner == NULL) | |
1199 | { | |
1200 | bfd_set_error (bfd_error_bad_value); | |
1201 | return false; | |
1202 | } | |
1203 | else | |
1204 | { | |
1205 | asection *osec; | |
1206 | ||
1207 | osec = sec->output_section; | |
1208 | indx = elf_section_data (osec)->dynindx; | |
1209 | if (indx == 0) | |
1210 | abort (); | |
1211 | } | |
1212 | ||
1213 | outrel.r_info = ELF32_R_INFO (indx, r_type); | |
1214 | outrel.r_addend = relocation + rel->r_addend; | |
1215 | } | |
1216 | } | |
1217 | ||
1218 | bfd_elf32_swap_reloca_out (output_bfd, &outrel, | |
1219 | (((Elf32_External_Rela *) | |
1220 | sreloc->contents) | |
1221 | + sreloc->reloc_count)); | |
1222 | ++sreloc->reloc_count; | |
1223 | ||
1224 | /* This reloc will be computed at runtime, so there's no | |
1225 | need to do anything now. */ | |
1226 | continue; | |
1227 | } | |
1228 | ||
1229 | break; | |
1230 | ||
1231 | default: | |
1232 | break; | |
1233 | } | |
1234 | ||
1235 | r = _bfd_final_link_relocate (howto, input_bfd, input_section, | |
1236 | contents, rel->r_offset, | |
1237 | relocation, rel->r_addend); | |
1238 | ||
1239 | if (r != bfd_reloc_ok) | |
1240 | { | |
1241 | switch (r) | |
1242 | { | |
1243 | default: | |
1244 | case bfd_reloc_outofrange: | |
1245 | abort (); | |
1246 | case bfd_reloc_overflow: | |
1247 | { | |
1248 | const char *name; | |
1249 | ||
1250 | if (h != NULL) | |
1251 | name = h->root.root.string; | |
1252 | else | |
1253 | { | |
ede4eed4 KR |
1254 | name = bfd_elf_string_from_elf_section (input_bfd, |
1255 | symtab_hdr->sh_link, | |
1256 | sym->st_name); | |
30dc85f1 ILT |
1257 | if (name == NULL) |
1258 | return false; | |
1259 | if (*name == '\0') | |
1260 | name = bfd_section_name (input_bfd, sec); | |
1261 | } | |
1262 | if (!(info->callbacks->reloc_overflow | |
1263 | (info, name, howto->name, (bfd_vma) 0, | |
1264 | input_bfd, input_section, rel->r_offset))) | |
1265 | return false; | |
1266 | } | |
1267 | break; | |
1268 | } | |
1269 | } | |
1270 | } | |
1271 | ||
1272 | return true; | |
1273 | } | |
1274 | ||
1275 | /* Finish up dynamic symbol handling. We set the contents of various | |
1276 | dynamic sections here. */ | |
1277 | ||
1278 | static boolean | |
1279 | elf_m68k_finish_dynamic_symbol (output_bfd, info, h, sym) | |
1280 | bfd *output_bfd; | |
1281 | struct bfd_link_info *info; | |
1282 | struct elf_link_hash_entry *h; | |
1283 | Elf_Internal_Sym *sym; | |
1284 | { | |
1285 | bfd *dynobj; | |
1286 | ||
1287 | dynobj = elf_hash_table (info)->dynobj; | |
1288 | ||
1289 | if (h->plt_offset != (bfd_vma) -1) | |
1290 | { | |
1291 | asection *splt; | |
1292 | asection *sgot; | |
1293 | asection *srela; | |
1294 | bfd_vma plt_index; | |
1295 | bfd_vma got_offset; | |
1296 | Elf_Internal_Rela rela; | |
1297 | ||
1298 | /* This symbol has an entry in the procedure linkage table. Set | |
1299 | it up. */ | |
1300 | ||
1301 | BFD_ASSERT (h->dynindx != -1); | |
1302 | ||
1303 | splt = bfd_get_section_by_name (dynobj, ".plt"); | |
1304 | sgot = bfd_get_section_by_name (dynobj, ".got.plt"); | |
1305 | srela = bfd_get_section_by_name (dynobj, ".rela.plt"); | |
1306 | BFD_ASSERT (splt != NULL && sgot != NULL && srela != NULL); | |
1307 | ||
1308 | /* Get the index in the procedure linkage table which | |
1309 | corresponds to this symbol. This is the index of this symbol | |
1310 | in all the symbols for which we are making plt entries. The | |
1311 | first entry in the procedure linkage table is reserved. */ | |
1312 | plt_index = h->plt_offset / PLT_ENTRY_SIZE - 1; | |
1313 | ||
1314 | /* Get the offset into the .got table of the entry that | |
1315 | corresponds to this function. Each .got entry is 4 bytes. | |
1316 | The first three are reserved. */ | |
1317 | got_offset = (plt_index + 3) * 4; | |
1318 | ||
1319 | /* Fill in the entry in the procedure linkage table. */ | |
1320 | memcpy (splt->contents + h->plt_offset, elf_m68k_plt_entry, | |
1321 | PLT_ENTRY_SIZE); | |
1322 | /* The offset is relative to the first extension word. */ | |
1323 | bfd_put_32 (output_bfd, | |
1324 | (sgot->output_section->vma | |
1325 | + sgot->output_offset | |
1326 | + got_offset | |
1327 | - (splt->output_section->vma | |
1328 | + h->plt_offset + 2)), | |
1329 | splt->contents + h->plt_offset + 4); | |
1330 | ||
1331 | bfd_put_32 (output_bfd, plt_index * sizeof (Elf32_External_Rela), | |
1332 | splt->contents + h->plt_offset + 10); | |
1333 | bfd_put_32 (output_bfd, - (h->plt_offset + 16), | |
1334 | splt->contents + h->plt_offset + 16); | |
1335 | ||
1336 | /* Fill in the entry in the global offset table. */ | |
1337 | bfd_put_32 (output_bfd, | |
1338 | (splt->output_section->vma | |
1339 | + splt->output_offset | |
1340 | + h->plt_offset | |
1341 | + 8), | |
1342 | sgot->contents + got_offset); | |
1343 | ||
1344 | /* Fill in the entry in the .rela.plt section. */ | |
1345 | rela.r_offset = (sgot->output_section->vma | |
1346 | + sgot->output_offset | |
1347 | + got_offset); | |
1348 | rela.r_info = ELF32_R_INFO (h->dynindx, R_68K_JMP_SLOT); | |
1349 | rela.r_addend = 0; | |
1350 | bfd_elf32_swap_reloca_out (output_bfd, &rela, | |
1351 | ((Elf32_External_Rela *) srela->contents | |
1352 | + plt_index)); | |
1353 | ||
1354 | if ((h->elf_link_hash_flags & ELF_LINK_HASH_DEF_REGULAR) == 0) | |
1355 | { | |
1356 | /* Mark the symbol as undefined, rather than as defined in | |
1357 | the .plt section. Leave the value alone. */ | |
1358 | sym->st_shndx = SHN_UNDEF; | |
1359 | } | |
1360 | } | |
1361 | ||
1362 | if (h->got_offset != (bfd_vma) -1) | |
1363 | { | |
1364 | asection *sgot; | |
1365 | asection *srela; | |
1366 | Elf_Internal_Rela rela; | |
1367 | ||
1368 | /* This symbol has an entry in the global offset table. Set it | |
1369 | up. */ | |
1370 | ||
1371 | BFD_ASSERT (h->dynindx != -1); | |
1372 | ||
1373 | sgot = bfd_get_section_by_name (dynobj, ".got"); | |
1374 | srela = bfd_get_section_by_name (dynobj, ".rela.got"); | |
1375 | BFD_ASSERT (sgot != NULL && srela != NULL); | |
1376 | ||
1377 | bfd_put_32 (output_bfd, (bfd_vma) 0, sgot->contents + h->got_offset); | |
1378 | ||
1379 | rela.r_offset = (sgot->output_section->vma | |
1380 | + sgot->output_offset | |
1381 | + h->got_offset); | |
1382 | rela.r_info = ELF32_R_INFO (h->dynindx, R_68K_GLOB_DAT); | |
1383 | rela.r_addend = 0; | |
1384 | bfd_elf32_swap_reloca_out (output_bfd, &rela, | |
1385 | ((Elf32_External_Rela *) srela->contents | |
1386 | + srela->reloc_count)); | |
1387 | ++srela->reloc_count; | |
1388 | } | |
1389 | ||
1390 | if ((h->elf_link_hash_flags & ELF_LINK_HASH_NEEDS_COPY) != 0) | |
1391 | { | |
1392 | asection *s; | |
1393 | Elf_Internal_Rela rela; | |
1394 | ||
1395 | /* This symbol needs a copy reloc. Set it up. */ | |
1396 | ||
1397 | BFD_ASSERT (h->dynindx != -1 | |
1398 | && (h->root.type == bfd_link_hash_defined | |
1399 | || h->root.type == bfd_link_hash_defweak)); | |
1400 | ||
1401 | s = bfd_get_section_by_name (h->root.u.def.section->owner, | |
1402 | ".rela.bss"); | |
1403 | BFD_ASSERT (s != NULL); | |
1404 | ||
1405 | rela.r_offset = (h->root.u.def.value | |
1406 | + h->root.u.def.section->output_section->vma | |
1407 | + h->root.u.def.section->output_offset); | |
1408 | rela.r_info = ELF32_R_INFO (h->dynindx, R_68K_COPY); | |
1409 | rela.r_addend = 0; | |
1410 | bfd_elf32_swap_reloca_out (output_bfd, &rela, | |
1411 | ((Elf32_External_Rela *) s->contents | |
1412 | + s->reloc_count)); | |
1413 | ++s->reloc_count; | |
1414 | } | |
1415 | ||
1416 | /* Mark _DYNAMIC and _GLOBAL_OFFSET_TABLE_ as absolute. */ | |
1417 | if (strcmp (h->root.root.string, "_DYNAMIC") == 0 | |
1418 | || strcmp (h->root.root.string, "_GLOBAL_OFFSET_TABLE_") == 0) | |
1419 | sym->st_shndx = SHN_ABS; | |
1420 | ||
1421 | return true; | |
1422 | } | |
1423 | ||
1424 | /* Finish up the dynamic sections. */ | |
1425 | ||
1426 | static boolean | |
1427 | elf_m68k_finish_dynamic_sections (output_bfd, info) | |
1428 | bfd *output_bfd; | |
1429 | struct bfd_link_info *info; | |
1430 | { | |
1431 | bfd *dynobj; | |
1432 | asection *sgot; | |
1433 | asection *sdyn; | |
1434 | ||
1435 | dynobj = elf_hash_table (info)->dynobj; | |
1436 | ||
1437 | sgot = bfd_get_section_by_name (dynobj, ".got.plt"); | |
1438 | BFD_ASSERT (sgot != NULL); | |
1439 | sdyn = bfd_get_section_by_name (dynobj, ".dynamic"); | |
1440 | ||
1441 | if (elf_hash_table (info)->dynamic_sections_created) | |
1442 | { | |
1443 | asection *splt; | |
1444 | Elf32_External_Dyn *dyncon, *dynconend; | |
1445 | ||
1446 | splt = bfd_get_section_by_name (dynobj, ".plt"); | |
1447 | BFD_ASSERT (splt != NULL && sdyn != NULL); | |
1448 | ||
1449 | dyncon = (Elf32_External_Dyn *) sdyn->contents; | |
1450 | dynconend = (Elf32_External_Dyn *) (sdyn->contents + sdyn->_raw_size); | |
1451 | for (; dyncon < dynconend; dyncon++) | |
1452 | { | |
1453 | Elf_Internal_Dyn dyn; | |
1454 | const char *name; | |
1455 | asection *s; | |
1456 | ||
1457 | bfd_elf32_swap_dyn_in (dynobj, dyncon, &dyn); | |
1458 | ||
1459 | switch (dyn.d_tag) | |
1460 | { | |
1461 | default: | |
1462 | break; | |
1463 | ||
1464 | case DT_PLTGOT: | |
1465 | name = ".got"; | |
1466 | goto get_vma; | |
1467 | case DT_JMPREL: | |
1468 | name = ".rela.plt"; | |
1469 | get_vma: | |
1470 | s = bfd_get_section_by_name (output_bfd, name); | |
1471 | BFD_ASSERT (s != NULL); | |
1472 | dyn.d_un.d_ptr = s->vma; | |
1473 | bfd_elf32_swap_dyn_out (output_bfd, &dyn, dyncon); | |
1474 | break; | |
1475 | ||
1476 | case DT_PLTRELSZ: | |
1477 | s = bfd_get_section_by_name (output_bfd, ".rela.plt"); | |
1478 | BFD_ASSERT (s != NULL); | |
1479 | if (s->_cooked_size != 0) | |
1480 | dyn.d_un.d_val = s->_cooked_size; | |
1481 | else | |
1482 | dyn.d_un.d_val = s->_raw_size; | |
1483 | bfd_elf32_swap_dyn_out (output_bfd, &dyn, dyncon); | |
1484 | break; | |
1485 | ||
1486 | case DT_RELASZ: | |
1487 | /* My reading of the SVR4 ABI indicates that the | |
1488 | procedure linkage table relocs (DT_JMPREL) should be | |
1489 | included in the overall relocs (DT_RELA). This is | |
1490 | what Solaris does. However, UnixWare can not handle | |
1491 | that case. Therefore, we override the DT_RELASZ entry | |
1492 | here to make it not include the JMPREL relocs. Since | |
1493 | the linker script arranges for .rela.plt to follow all | |
1494 | other relocation sections, we don't have to worry | |
1495 | about changing the DT_RELA entry. */ | |
1496 | /* FIXME: This comment is from elf32-i386.c, what about | |
1497 | the SVR4/m68k implementations? */ | |
1498 | s = bfd_get_section_by_name (output_bfd, ".rela.plt"); | |
1499 | if (s != NULL) | |
1500 | { | |
1501 | if (s->_cooked_size != 0) | |
1502 | dyn.d_un.d_val -= s->_cooked_size; | |
1503 | else | |
1504 | dyn.d_un.d_val -= s->_raw_size; | |
1505 | } | |
1506 | bfd_elf32_swap_dyn_out (output_bfd, &dyn, dyncon); | |
1507 | break; | |
1508 | } | |
1509 | } | |
1510 | ||
1511 | /* Fill in the first entry in the procedure linkage table. */ | |
1512 | if (splt->_raw_size > 0) | |
1513 | { | |
1514 | memcpy (splt->contents, elf_m68k_plt0_entry, PLT_ENTRY_SIZE); | |
1515 | bfd_put_32 (output_bfd, | |
1516 | (sgot->output_section->vma | |
1517 | + sgot->output_offset + 4 | |
1518 | - (splt->output_section->vma + 2)), | |
1519 | splt->contents + 4); | |
1520 | bfd_put_32 (output_bfd, | |
1521 | (sgot->output_section->vma | |
1522 | + sgot->output_offset + 8 | |
1523 | - (splt->output_section->vma + 10)), | |
1524 | splt->contents + 12); | |
1525 | } | |
1526 | ||
1527 | elf_section_data (splt->output_section)->this_hdr.sh_entsize | |
1528 | = PLT_ENTRY_SIZE; | |
1529 | } | |
1530 | ||
1531 | /* Fill in the first three entries in the global offset table. */ | |
1532 | if (sgot->_raw_size > 0) | |
1533 | { | |
1534 | if (sdyn == NULL) | |
1535 | bfd_put_32 (output_bfd, (bfd_vma) 0, sgot->contents); | |
1536 | else | |
1537 | bfd_put_32 (output_bfd, | |
1538 | sdyn->output_section->vma + sdyn->output_offset, | |
1539 | sgot->contents); | |
1540 | bfd_put_32 (output_bfd, (bfd_vma) 0, sgot->contents + 4); | |
1541 | bfd_put_32 (output_bfd, (bfd_vma) 0, sgot->contents + 8); | |
1542 | } | |
1543 | ||
1544 | elf_section_data (sgot->output_section)->this_hdr.sh_entsize = 4; | |
1545 | ||
1546 | return true; | |
1547 | } | |
1548 | ||
1549 | #define TARGET_BIG_SYM bfd_elf32_m68k_vec | |
1550 | #define TARGET_BIG_NAME "elf32-m68k" | |
1551 | #define ELF_MACHINE_CODE EM_68K | |
1552 | #define ELF_MAXPAGESIZE 0x2000 | |
1553 | #define elf_backend_create_dynamic_sections \ | |
ede4eed4 | 1554 | _bfd_elf_create_dynamic_sections |
30dc85f1 ILT |
1555 | #define elf_backend_check_relocs elf_m68k_check_relocs |
1556 | #define elf_backend_adjust_dynamic_symbol \ | |
1557 | elf_m68k_adjust_dynamic_symbol | |
1558 | #define elf_backend_size_dynamic_sections \ | |
1559 | elf_m68k_size_dynamic_sections | |
1560 | #define elf_backend_relocate_section elf_m68k_relocate_section | |
1561 | #define elf_backend_finish_dynamic_symbol \ | |
1562 | elf_m68k_finish_dynamic_symbol | |
1563 | #define elf_backend_finish_dynamic_sections \ | |
1564 | elf_m68k_finish_dynamic_sections | |
ede4eed4 KR |
1565 | #define elf_backend_want_got_plt 1 |
1566 | #define elf_backend_plt_readonly 1 | |
1567 | #define elf_backend_want_plt_sym 0 | |
30dc85f1 ILT |
1568 | |
1569 | #include "elf32-target.h" |