Commit | Line | Data |
---|---|---|
252b5132 RH |
1 | /* Motorola 68k series support for 32-bit ELF |
2 | Copyright 1993, 95, 96, 97, 98, 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 | #include "bfd.h" | |
21 | #include "sysdep.h" | |
22 | #include "bfdlink.h" | |
23 | #include "libbfd.h" | |
24 | #include "elf-bfd.h" | |
25 | #include "elf/m68k.h" | |
26 | ||
27 | static reloc_howto_type *reloc_type_lookup | |
28 | PARAMS ((bfd *, bfd_reloc_code_real_type)); | |
29 | static void rtype_to_howto | |
30 | PARAMS ((bfd *, arelent *, Elf32_Internal_Rela *)); | |
31 | static struct bfd_hash_entry *elf_m68k_link_hash_newfunc | |
32 | PARAMS ((struct bfd_hash_entry *, struct bfd_hash_table *, const char *)); | |
33 | static struct bfd_link_hash_table *elf_m68k_link_hash_table_create | |
34 | PARAMS ((bfd *)); | |
35 | static boolean elf_m68k_check_relocs | |
36 | PARAMS ((bfd *, struct bfd_link_info *, asection *, | |
37 | const Elf_Internal_Rela *)); | |
38 | static asection *elf_m68k_gc_mark_hook | |
39 | PARAMS ((bfd *, struct bfd_link_info *, Elf_Internal_Rela *, | |
40 | struct elf_link_hash_entry *, Elf_Internal_Sym *)); | |
41 | static boolean elf_m68k_gc_sweep_hook | |
42 | PARAMS ((bfd *, struct bfd_link_info *, asection *, | |
43 | const Elf_Internal_Rela *)); | |
44 | static boolean elf_m68k_adjust_dynamic_symbol | |
45 | PARAMS ((struct bfd_link_info *, struct elf_link_hash_entry *)); | |
46 | static boolean elf_m68k_adjust_dynindx | |
47 | PARAMS ((struct elf_link_hash_entry *, PTR)); | |
48 | static boolean elf_m68k_size_dynamic_sections | |
49 | PARAMS ((bfd *, struct bfd_link_info *)); | |
50 | static boolean elf_m68k_relocate_section | |
51 | PARAMS ((bfd *, struct bfd_link_info *, bfd *, asection *, bfd_byte *, | |
52 | Elf_Internal_Rela *, Elf_Internal_Sym *, asection **)); | |
53 | static boolean elf_m68k_finish_dynamic_symbol | |
54 | PARAMS ((bfd *, struct bfd_link_info *, struct elf_link_hash_entry *, | |
55 | Elf_Internal_Sym *)); | |
56 | static boolean elf_m68k_finish_dynamic_sections | |
57 | PARAMS ((bfd *, struct bfd_link_info *)); | |
58 | ||
59 | static reloc_howto_type howto_table[] = { | |
60 | HOWTO(R_68K_NONE, 0, 0, 0, false,0, complain_overflow_dont, bfd_elf_generic_reloc, "R_68K_NONE", false, 0, 0x00000000,false), | |
61 | HOWTO(R_68K_32, 0, 2,32, false,0, complain_overflow_bitfield, bfd_elf_generic_reloc, "R_68K_32", false, 0, 0xffffffff,false), | |
62 | HOWTO(R_68K_16, 0, 1,16, false,0, complain_overflow_bitfield, bfd_elf_generic_reloc, "R_68K_16", false, 0, 0x0000ffff,false), | |
63 | HOWTO(R_68K_8, 0, 0, 8, false,0, complain_overflow_bitfield, bfd_elf_generic_reloc, "R_68K_8", false, 0, 0x000000ff,false), | |
64 | HOWTO(R_68K_PC32, 0, 2,32, true, 0, complain_overflow_bitfield, bfd_elf_generic_reloc, "R_68K_PC32", false, 0, 0xffffffff,true), | |
65 | HOWTO(R_68K_PC16, 0, 1,16, true, 0, complain_overflow_signed, bfd_elf_generic_reloc, "R_68K_PC16", false, 0, 0x0000ffff,true), | |
66 | HOWTO(R_68K_PC8, 0, 0, 8, true, 0, complain_overflow_signed, bfd_elf_generic_reloc, "R_68K_PC8", false, 0, 0x000000ff,true), | |
67 | HOWTO(R_68K_GOT32, 0, 2,32, true, 0, complain_overflow_bitfield, bfd_elf_generic_reloc, "R_68K_GOT32", false, 0, 0xffffffff,true), | |
68 | HOWTO(R_68K_GOT16, 0, 1,16, true, 0, complain_overflow_signed, bfd_elf_generic_reloc, "R_68K_GOT16", false, 0, 0x0000ffff,true), | |
69 | HOWTO(R_68K_GOT8, 0, 0, 8, true, 0, complain_overflow_signed, bfd_elf_generic_reloc, "R_68K_GOT8", false, 0, 0x000000ff,true), | |
70 | HOWTO(R_68K_GOT32O, 0, 2,32, false,0, complain_overflow_bitfield, bfd_elf_generic_reloc, "R_68K_GOT32O", false, 0, 0xffffffff,false), | |
71 | HOWTO(R_68K_GOT16O, 0, 1,16, false,0, complain_overflow_signed, bfd_elf_generic_reloc, "R_68K_GOT16O", false, 0, 0x0000ffff,false), | |
72 | HOWTO(R_68K_GOT8O, 0, 0, 8, false,0, complain_overflow_signed, bfd_elf_generic_reloc, "R_68K_GOT8O", false, 0, 0x000000ff,false), | |
73 | HOWTO(R_68K_PLT32, 0, 2,32, true, 0, complain_overflow_bitfield, bfd_elf_generic_reloc, "R_68K_PLT32", false, 0, 0xffffffff,true), | |
74 | HOWTO(R_68K_PLT16, 0, 1,16, true, 0, complain_overflow_signed, bfd_elf_generic_reloc, "R_68K_PLT16", false, 0, 0x0000ffff,true), | |
75 | HOWTO(R_68K_PLT8, 0, 0, 8, true, 0, complain_overflow_signed, bfd_elf_generic_reloc, "R_68K_PLT8", false, 0, 0x000000ff,true), | |
76 | HOWTO(R_68K_PLT32O, 0, 2,32, false,0, complain_overflow_bitfield, bfd_elf_generic_reloc, "R_68K_PLT32O", false, 0, 0xffffffff,false), | |
77 | HOWTO(R_68K_PLT16O, 0, 1,16, false,0, complain_overflow_signed, bfd_elf_generic_reloc, "R_68K_PLT16O", false, 0, 0x0000ffff,false), | |
78 | HOWTO(R_68K_PLT8O, 0, 0, 8, false,0, complain_overflow_signed, bfd_elf_generic_reloc, "R_68K_PLT8O", false, 0, 0x000000ff,false), | |
79 | HOWTO(R_68K_COPY, 0, 0, 0, false,0, complain_overflow_dont, bfd_elf_generic_reloc, "R_68K_COPY", false, 0, 0xffffffff,false), | |
80 | HOWTO(R_68K_GLOB_DAT, 0, 2,32, false,0, complain_overflow_dont, bfd_elf_generic_reloc, "R_68K_GLOB_DAT", false, 0, 0xffffffff,false), | |
81 | HOWTO(R_68K_JMP_SLOT, 0, 2,32, false,0, complain_overflow_dont, bfd_elf_generic_reloc, "R_68K_JMP_SLOT", false, 0, 0xffffffff,false), | |
82 | HOWTO(R_68K_RELATIVE, 0, 2,32, false,0, complain_overflow_dont, bfd_elf_generic_reloc, "R_68K_RELATIVE", false, 0, 0xffffffff,false), | |
83 | /* GNU extension to record C++ vtable hierarchy */ | |
84 | HOWTO (R_68K_GNU_VTINHERIT, /* type */ | |
85 | 0, /* rightshift */ | |
86 | 2, /* size (0 = byte, 1 = short, 2 = long) */ | |
87 | 0, /* bitsize */ | |
88 | false, /* pc_relative */ | |
89 | 0, /* bitpos */ | |
90 | complain_overflow_dont, /* complain_on_overflow */ | |
91 | NULL, /* special_function */ | |
92 | "R_68K_GNU_VTINHERIT", /* name */ | |
93 | false, /* partial_inplace */ | |
94 | 0, /* src_mask */ | |
95 | 0, /* dst_mask */ | |
96 | false), | |
97 | /* GNU extension to record C++ vtable member usage */ | |
98 | HOWTO (R_68K_GNU_VTENTRY, /* type */ | |
99 | 0, /* rightshift */ | |
100 | 2, /* size (0 = byte, 1 = short, 2 = long) */ | |
101 | 0, /* bitsize */ | |
102 | false, /* pc_relative */ | |
103 | 0, /* bitpos */ | |
104 | complain_overflow_dont, /* complain_on_overflow */ | |
105 | _bfd_elf_rel_vtable_reloc_fn, /* special_function */ | |
106 | "R_68K_GNU_VTENTRY", /* name */ | |
107 | false, /* partial_inplace */ | |
108 | 0, /* src_mask */ | |
109 | 0, /* dst_mask */ | |
110 | false), | |
111 | }; | |
112 | ||
113 | static void | |
114 | rtype_to_howto (abfd, cache_ptr, dst) | |
115 | bfd *abfd; | |
116 | arelent *cache_ptr; | |
117 | Elf_Internal_Rela *dst; | |
118 | { | |
119 | BFD_ASSERT (ELF32_R_TYPE(dst->r_info) < (unsigned int) R_68K_max); | |
120 | cache_ptr->howto = &howto_table[ELF32_R_TYPE(dst->r_info)]; | |
121 | } | |
122 | ||
123 | #define elf_info_to_howto rtype_to_howto | |
124 | ||
125 | static const struct | |
126 | { | |
127 | bfd_reloc_code_real_type bfd_val; | |
128 | int elf_val; | |
129 | } reloc_map[] = { | |
130 | { BFD_RELOC_NONE, R_68K_NONE }, | |
131 | { BFD_RELOC_32, R_68K_32 }, | |
132 | { BFD_RELOC_16, R_68K_16 }, | |
133 | { BFD_RELOC_8, R_68K_8 }, | |
134 | { BFD_RELOC_32_PCREL, R_68K_PC32 }, | |
135 | { BFD_RELOC_16_PCREL, R_68K_PC16 }, | |
136 | { BFD_RELOC_8_PCREL, R_68K_PC8 }, | |
137 | { BFD_RELOC_32_GOT_PCREL, R_68K_GOT32 }, | |
138 | { BFD_RELOC_16_GOT_PCREL, R_68K_GOT16 }, | |
139 | { BFD_RELOC_8_GOT_PCREL, R_68K_GOT8 }, | |
140 | { BFD_RELOC_32_GOTOFF, R_68K_GOT32O }, | |
141 | { BFD_RELOC_16_GOTOFF, R_68K_GOT16O }, | |
142 | { BFD_RELOC_8_GOTOFF, R_68K_GOT8O }, | |
143 | { BFD_RELOC_32_PLT_PCREL, R_68K_PLT32 }, | |
144 | { BFD_RELOC_16_PLT_PCREL, R_68K_PLT16 }, | |
145 | { BFD_RELOC_8_PLT_PCREL, R_68K_PLT8 }, | |
146 | { BFD_RELOC_32_PLTOFF, R_68K_PLT32O }, | |
147 | { BFD_RELOC_16_PLTOFF, R_68K_PLT16O }, | |
148 | { BFD_RELOC_8_PLTOFF, R_68K_PLT8O }, | |
149 | { BFD_RELOC_NONE, R_68K_COPY }, | |
150 | { BFD_RELOC_68K_GLOB_DAT, R_68K_GLOB_DAT }, | |
151 | { BFD_RELOC_68K_JMP_SLOT, R_68K_JMP_SLOT }, | |
152 | { BFD_RELOC_68K_RELATIVE, R_68K_RELATIVE }, | |
153 | { BFD_RELOC_CTOR, R_68K_32 }, | |
154 | { BFD_RELOC_VTABLE_INHERIT, R_68K_GNU_VTINHERIT }, | |
155 | { BFD_RELOC_VTABLE_ENTRY, R_68K_GNU_VTENTRY }, | |
156 | }; | |
157 | ||
158 | static reloc_howto_type * | |
159 | reloc_type_lookup (abfd, code) | |
160 | bfd *abfd; | |
161 | bfd_reloc_code_real_type code; | |
162 | { | |
163 | unsigned int i; | |
164 | for (i = 0; i < sizeof (reloc_map) / sizeof (reloc_map[0]); i++) | |
165 | { | |
166 | if (reloc_map[i].bfd_val == code) | |
167 | return &howto_table[reloc_map[i].elf_val]; | |
168 | } | |
169 | return 0; | |
170 | } | |
171 | ||
172 | #define bfd_elf32_bfd_reloc_type_lookup reloc_type_lookup | |
173 | #define ELF_ARCH bfd_arch_m68k | |
174 | /* end code generated by elf.el */ | |
175 | ||
176 | #define USE_RELA | |
177 | ||
178 | \f | |
179 | /* Functions for the m68k ELF linker. */ | |
180 | ||
181 | /* The name of the dynamic interpreter. This is put in the .interp | |
182 | section. */ | |
183 | ||
184 | #define ELF_DYNAMIC_INTERPRETER "/usr/lib/libc.so.1" | |
185 | ||
186 | /* The size in bytes of an entry in the procedure linkage table. */ | |
187 | ||
188 | #define PLT_ENTRY_SIZE 20 | |
189 | ||
190 | /* The first entry in a procedure linkage table looks like this. See | |
191 | the SVR4 ABI m68k supplement to see how this works. */ | |
192 | ||
193 | static const bfd_byte elf_m68k_plt0_entry[PLT_ENTRY_SIZE] = | |
194 | { | |
195 | 0x2f, 0x3b, 0x01, 0x70, /* move.l (%pc,addr),-(%sp) */ | |
196 | 0, 0, 0, 0, /* replaced with offset to .got + 4. */ | |
197 | 0x4e, 0xfb, 0x01, 0x71, /* jmp ([%pc,addr]) */ | |
198 | 0, 0, 0, 0, /* replaced with offset to .got + 8. */ | |
199 | 0, 0, 0, 0 /* pad out to 20 bytes. */ | |
200 | }; | |
201 | ||
202 | /* Subsequent entries in a procedure linkage table look like this. */ | |
203 | ||
204 | static const bfd_byte elf_m68k_plt_entry[PLT_ENTRY_SIZE] = | |
205 | { | |
206 | 0x4e, 0xfb, 0x01, 0x71, /* jmp ([%pc,symbol@GOTPC]) */ | |
207 | 0, 0, 0, 0, /* replaced with offset to symbol's .got entry. */ | |
208 | 0x2f, 0x3c, /* move.l #offset,-(%sp) */ | |
209 | 0, 0, 0, 0, /* replaced with offset into relocation table. */ | |
210 | 0x60, 0xff, /* bra.l .plt */ | |
211 | 0, 0, 0, 0 /* replaced with offset to start of .plt. */ | |
212 | }; | |
213 | ||
214 | /* The m68k linker needs to keep track of the number of relocs that it | |
215 | decides to copy in check_relocs for each symbol. This is so that it | |
216 | can discard PC relative relocs if it doesn't need them when linking | |
217 | with -Bsymbolic. We store the information in a field extending the | |
218 | regular ELF linker hash table. */ | |
219 | ||
220 | /* This structure keeps track of the number of PC relative relocs we have | |
221 | copied for a given symbol. */ | |
222 | ||
223 | struct elf_m68k_pcrel_relocs_copied | |
224 | { | |
225 | /* Next section. */ | |
226 | struct elf_m68k_pcrel_relocs_copied *next; | |
227 | /* A section in dynobj. */ | |
228 | asection *section; | |
229 | /* Number of relocs copied in this section. */ | |
230 | bfd_size_type count; | |
231 | }; | |
232 | ||
233 | /* m68k ELF linker hash entry. */ | |
234 | ||
235 | struct elf_m68k_link_hash_entry | |
236 | { | |
237 | struct elf_link_hash_entry root; | |
238 | ||
239 | /* Number of PC relative relocs copied for this symbol. */ | |
240 | struct elf_m68k_pcrel_relocs_copied *pcrel_relocs_copied; | |
241 | }; | |
242 | ||
243 | /* m68k ELF linker hash table. */ | |
244 | ||
245 | struct elf_m68k_link_hash_table | |
246 | { | |
247 | struct elf_link_hash_table root; | |
248 | }; | |
249 | ||
250 | /* Declare this now that the above structures are defined. */ | |
251 | ||
252 | static boolean elf_m68k_discard_copies | |
253 | PARAMS ((struct elf_m68k_link_hash_entry *, PTR)); | |
254 | ||
255 | /* Traverse an m68k ELF linker hash table. */ | |
256 | ||
257 | #define elf_m68k_link_hash_traverse(table, func, info) \ | |
258 | (elf_link_hash_traverse \ | |
259 | (&(table)->root, \ | |
260 | (boolean (*) PARAMS ((struct elf_link_hash_entry *, PTR))) (func), \ | |
261 | (info))) | |
262 | ||
263 | /* Get the m68k ELF linker hash table from a link_info structure. */ | |
264 | ||
265 | #define elf_m68k_hash_table(p) \ | |
266 | ((struct elf_m68k_link_hash_table *) (p)->hash) | |
267 | ||
268 | /* Create an entry in an m68k ELF linker hash table. */ | |
269 | ||
270 | static struct bfd_hash_entry * | |
271 | elf_m68k_link_hash_newfunc (entry, table, string) | |
272 | struct bfd_hash_entry *entry; | |
273 | struct bfd_hash_table *table; | |
274 | const char *string; | |
275 | { | |
276 | struct elf_m68k_link_hash_entry *ret = | |
277 | (struct elf_m68k_link_hash_entry *) entry; | |
278 | ||
279 | /* Allocate the structure if it has not already been allocated by a | |
280 | subclass. */ | |
281 | if (ret == (struct elf_m68k_link_hash_entry *) NULL) | |
282 | ret = ((struct elf_m68k_link_hash_entry *) | |
283 | bfd_hash_allocate (table, | |
284 | sizeof (struct elf_m68k_link_hash_entry))); | |
285 | if (ret == (struct elf_m68k_link_hash_entry *) NULL) | |
286 | return (struct bfd_hash_entry *) ret; | |
287 | ||
288 | /* Call the allocation method of the superclass. */ | |
289 | ret = ((struct elf_m68k_link_hash_entry *) | |
290 | _bfd_elf_link_hash_newfunc ((struct bfd_hash_entry *) ret, | |
291 | table, string)); | |
292 | if (ret != (struct elf_m68k_link_hash_entry *) NULL) | |
293 | { | |
294 | ret->pcrel_relocs_copied = NULL; | |
295 | } | |
296 | ||
297 | return (struct bfd_hash_entry *) ret; | |
298 | } | |
299 | ||
300 | /* Create an m68k ELF linker hash table. */ | |
301 | ||
302 | static struct bfd_link_hash_table * | |
303 | elf_m68k_link_hash_table_create (abfd) | |
304 | bfd *abfd; | |
305 | { | |
306 | struct elf_m68k_link_hash_table *ret; | |
307 | ||
308 | ret = ((struct elf_m68k_link_hash_table *) | |
309 | bfd_alloc (abfd, sizeof (struct elf_m68k_link_hash_table))); | |
310 | if (ret == (struct elf_m68k_link_hash_table *) NULL) | |
311 | return NULL; | |
312 | ||
313 | if (! _bfd_elf_link_hash_table_init (&ret->root, abfd, | |
314 | elf_m68k_link_hash_newfunc)) | |
315 | { | |
316 | bfd_release (abfd, ret); | |
317 | return NULL; | |
318 | } | |
319 | ||
320 | return &ret->root.root; | |
321 | } | |
322 | ||
323 | /* Look through the relocs for a section during the first phase, and | |
324 | allocate space in the global offset table or procedure linkage | |
325 | table. */ | |
326 | ||
327 | static boolean | |
328 | elf_m68k_check_relocs (abfd, info, sec, relocs) | |
329 | bfd *abfd; | |
330 | struct bfd_link_info *info; | |
331 | asection *sec; | |
332 | const Elf_Internal_Rela *relocs; | |
333 | { | |
334 | bfd *dynobj; | |
335 | Elf_Internal_Shdr *symtab_hdr; | |
336 | struct elf_link_hash_entry **sym_hashes; | |
337 | bfd_signed_vma *local_got_refcounts; | |
338 | const Elf_Internal_Rela *rel; | |
339 | const Elf_Internal_Rela *rel_end; | |
340 | asection *sgot; | |
341 | asection *srelgot; | |
342 | asection *sreloc; | |
343 | ||
344 | if (info->relocateable) | |
345 | return true; | |
346 | ||
347 | dynobj = elf_hash_table (info)->dynobj; | |
348 | symtab_hdr = &elf_tdata (abfd)->symtab_hdr; | |
349 | sym_hashes = elf_sym_hashes (abfd); | |
350 | local_got_refcounts = elf_local_got_refcounts (abfd); | |
351 | ||
352 | sgot = NULL; | |
353 | srelgot = NULL; | |
354 | sreloc = NULL; | |
355 | ||
356 | rel_end = relocs + sec->reloc_count; | |
357 | for (rel = relocs; rel < rel_end; rel++) | |
358 | { | |
359 | unsigned long r_symndx; | |
360 | struct elf_link_hash_entry *h; | |
361 | ||
362 | r_symndx = ELF32_R_SYM (rel->r_info); | |
363 | ||
364 | if (r_symndx < symtab_hdr->sh_info) | |
365 | h = NULL; | |
366 | else | |
367 | h = sym_hashes[r_symndx - symtab_hdr->sh_info]; | |
368 | ||
369 | switch (ELF32_R_TYPE (rel->r_info)) | |
370 | { | |
371 | case R_68K_GOT8: | |
372 | case R_68K_GOT16: | |
373 | case R_68K_GOT32: | |
374 | if (h != NULL | |
375 | && strcmp (h->root.root.string, "_GLOBAL_OFFSET_TABLE_") == 0) | |
376 | break; | |
377 | /* Fall through. */ | |
378 | case R_68K_GOT8O: | |
379 | case R_68K_GOT16O: | |
380 | case R_68K_GOT32O: | |
381 | /* This symbol requires a global offset table entry. */ | |
382 | ||
383 | if (dynobj == NULL) | |
384 | { | |
385 | /* Create the .got section. */ | |
386 | elf_hash_table (info)->dynobj = dynobj = abfd; | |
387 | if (!_bfd_elf_create_got_section (dynobj, info)) | |
388 | return false; | |
389 | } | |
390 | ||
391 | if (sgot == NULL) | |
392 | { | |
393 | sgot = bfd_get_section_by_name (dynobj, ".got"); | |
394 | BFD_ASSERT (sgot != NULL); | |
395 | } | |
396 | ||
397 | if (srelgot == NULL | |
398 | && (h != NULL || info->shared)) | |
399 | { | |
400 | srelgot = bfd_get_section_by_name (dynobj, ".rela.got"); | |
401 | if (srelgot == NULL) | |
402 | { | |
403 | srelgot = bfd_make_section (dynobj, ".rela.got"); | |
404 | if (srelgot == NULL | |
405 | || !bfd_set_section_flags (dynobj, srelgot, | |
406 | (SEC_ALLOC | |
407 | | SEC_LOAD | |
408 | | SEC_HAS_CONTENTS | |
409 | | SEC_IN_MEMORY | |
410 | | SEC_LINKER_CREATED | |
411 | | SEC_READONLY)) | |
412 | || !bfd_set_section_alignment (dynobj, srelgot, 2)) | |
413 | return false; | |
414 | } | |
415 | } | |
416 | ||
417 | if (h != NULL) | |
418 | { | |
419 | if (h->got.refcount == -1) | |
420 | { | |
421 | h->got.refcount = 1; | |
422 | ||
423 | /* Make sure this symbol is output as a dynamic symbol. */ | |
424 | if (h->dynindx == -1) | |
425 | { | |
426 | if (!bfd_elf32_link_record_dynamic_symbol (info, h)) | |
427 | return false; | |
428 | } | |
429 | ||
430 | /* Allocate space in the .got section. */ | |
431 | sgot->_raw_size += 4; | |
432 | /* Allocate relocation space. */ | |
433 | srelgot->_raw_size += sizeof (Elf32_External_Rela); | |
434 | } | |
435 | else | |
436 | h->got.refcount++; | |
437 | } | |
438 | else | |
439 | { | |
440 | /* This is a global offset table entry for a local symbol. */ | |
441 | if (local_got_refcounts == NULL) | |
442 | { | |
443 | size_t size; | |
444 | ||
445 | size = symtab_hdr->sh_info * sizeof (bfd_signed_vma); | |
446 | local_got_refcounts = ((bfd_signed_vma *) | |
447 | bfd_alloc (abfd, size)); | |
448 | if (local_got_refcounts == NULL) | |
449 | return false; | |
450 | elf_local_got_refcounts (abfd) = local_got_refcounts; | |
451 | memset (local_got_refcounts, -1, size); | |
452 | } | |
453 | if (local_got_refcounts[r_symndx] == -1) | |
454 | { | |
455 | local_got_refcounts[r_symndx] = 1; | |
456 | ||
457 | sgot->_raw_size += 4; | |
458 | if (info->shared) | |
459 | { | |
460 | /* If we are generating a shared object, we need to | |
461 | output a R_68K_RELATIVE reloc so that the dynamic | |
462 | linker can adjust this GOT entry. */ | |
463 | srelgot->_raw_size += sizeof (Elf32_External_Rela); | |
464 | } | |
465 | } | |
466 | else | |
467 | local_got_refcounts[r_symndx]++; | |
468 | } | |
469 | break; | |
470 | ||
471 | case R_68K_PLT8: | |
472 | case R_68K_PLT16: | |
473 | case R_68K_PLT32: | |
474 | /* This symbol requires a procedure linkage table entry. We | |
475 | actually build the entry in adjust_dynamic_symbol, | |
476 | because this might be a case of linking PIC code which is | |
477 | never referenced by a dynamic object, in which case we | |
478 | don't need to generate a procedure linkage table entry | |
479 | after all. */ | |
480 | ||
481 | /* If this is a local symbol, we resolve it directly without | |
482 | creating a procedure linkage table entry. */ | |
483 | if (h == NULL) | |
484 | continue; | |
485 | ||
486 | h->elf_link_hash_flags |= ELF_LINK_HASH_NEEDS_PLT; | |
487 | if (h->plt.refcount == -1) | |
488 | h->plt.refcount = 1; | |
489 | else | |
490 | h->plt.refcount++; | |
491 | break; | |
492 | ||
493 | case R_68K_PLT8O: | |
494 | case R_68K_PLT16O: | |
495 | case R_68K_PLT32O: | |
496 | /* This symbol requires a procedure linkage table entry. */ | |
497 | ||
498 | if (h == NULL) | |
499 | { | |
500 | /* It does not make sense to have this relocation for a | |
501 | local symbol. FIXME: does it? How to handle it if | |
502 | it does make sense? */ | |
503 | bfd_set_error (bfd_error_bad_value); | |
504 | return false; | |
505 | } | |
506 | ||
507 | /* Make sure this symbol is output as a dynamic symbol. */ | |
508 | if (h->dynindx == -1) | |
509 | { | |
510 | if (!bfd_elf32_link_record_dynamic_symbol (info, h)) | |
511 | return false; | |
512 | } | |
513 | ||
514 | h->elf_link_hash_flags |= ELF_LINK_HASH_NEEDS_PLT; | |
515 | if (h->plt.refcount == -1) | |
516 | h->plt.refcount = 1; | |
517 | else | |
518 | h->plt.refcount++; | |
519 | break; | |
520 | ||
521 | case R_68K_PC8: | |
522 | case R_68K_PC16: | |
523 | case R_68K_PC32: | |
524 | /* If we are creating a shared library and this is not a local | |
525 | symbol, we need to copy the reloc into the shared library. | |
526 | However when linking with -Bsymbolic and this is a global | |
527 | symbol which is defined in an object we are including in the | |
528 | link (i.e., DEF_REGULAR is set), then we can resolve the | |
529 | reloc directly. At this point we have not seen all the input | |
530 | files, so it is possible that DEF_REGULAR is not set now but | |
531 | will be set later (it is never cleared). We account for that | |
532 | possibility below by storing information in the | |
533 | pcrel_relocs_copied field of the hash table entry. */ | |
534 | if (!(info->shared | |
535 | && (sec->flags & SEC_ALLOC) != 0 | |
536 | && h != NULL | |
537 | && (!info->symbolic | |
538 | || (h->elf_link_hash_flags | |
539 | & ELF_LINK_HASH_DEF_REGULAR) == 0))) | |
540 | { | |
541 | if (h != NULL) | |
542 | { | |
543 | /* Make sure a plt entry is created for this symbol if | |
544 | it turns out to be a function defined by a dynamic | |
545 | object. */ | |
546 | if (h->plt.refcount == -1) | |
547 | h->plt.refcount = 1; | |
548 | else | |
549 | h->plt.refcount++; | |
550 | } | |
551 | break; | |
552 | } | |
553 | /* Fall through. */ | |
554 | case R_68K_8: | |
555 | case R_68K_16: | |
556 | case R_68K_32: | |
557 | if (h != NULL) | |
558 | { | |
559 | /* Make sure a plt entry is created for this symbol if it | |
560 | turns out to be a function defined by a dynamic object. */ | |
561 | if (h->plt.refcount == -1) | |
562 | h->plt.refcount = 1; | |
563 | else | |
564 | h->plt.refcount++; | |
565 | } | |
566 | ||
567 | /* If we are creating a shared library, we need to copy the | |
568 | reloc into the shared library. */ | |
569 | if (info->shared | |
570 | && (sec->flags & SEC_ALLOC) != 0) | |
571 | { | |
572 | /* When creating a shared object, we must copy these | |
573 | reloc types into the output file. We create a reloc | |
574 | section in dynobj and make room for this reloc. */ | |
575 | if (sreloc == NULL) | |
576 | { | |
577 | const char *name; | |
578 | ||
579 | name = (bfd_elf_string_from_elf_section | |
580 | (abfd, | |
581 | elf_elfheader (abfd)->e_shstrndx, | |
582 | elf_section_data (sec)->rel_hdr.sh_name)); | |
583 | if (name == NULL) | |
584 | return false; | |
585 | ||
586 | BFD_ASSERT (strncmp (name, ".rela", 5) == 0 | |
587 | && strcmp (bfd_get_section_name (abfd, sec), | |
588 | name + 5) == 0); | |
589 | ||
590 | sreloc = bfd_get_section_by_name (dynobj, name); | |
591 | if (sreloc == NULL) | |
592 | { | |
593 | sreloc = bfd_make_section (dynobj, name); | |
594 | if (sreloc == NULL | |
595 | || !bfd_set_section_flags (dynobj, sreloc, | |
596 | (SEC_ALLOC | |
597 | | SEC_LOAD | |
598 | | SEC_HAS_CONTENTS | |
599 | | SEC_IN_MEMORY | |
600 | | SEC_LINKER_CREATED | |
601 | | SEC_READONLY)) | |
602 | || !bfd_set_section_alignment (dynobj, sreloc, 2)) | |
603 | return false; | |
604 | } | |
605 | } | |
606 | ||
607 | sreloc->_raw_size += sizeof (Elf32_External_Rela); | |
608 | ||
609 | /* If we are linking with -Bsymbolic, we count the number of | |
610 | PC relative relocations we have entered for this symbol, | |
611 | so that we can discard them again if the symbol is later | |
612 | defined by a regular object. Note that this function is | |
613 | only called if we are using an m68kelf linker hash table, | |
614 | which means that h is really a pointer to an | |
615 | elf_m68k_link_hash_entry. */ | |
616 | if ((ELF32_R_TYPE (rel->r_info) == R_68K_PC8 | |
617 | || ELF32_R_TYPE (rel->r_info) == R_68K_PC16 | |
618 | || ELF32_R_TYPE (rel->r_info) == R_68K_PC32) | |
619 | && info->symbolic) | |
620 | { | |
621 | struct elf_m68k_link_hash_entry *eh; | |
622 | struct elf_m68k_pcrel_relocs_copied *p; | |
623 | ||
624 | eh = (struct elf_m68k_link_hash_entry *) h; | |
625 | ||
626 | for (p = eh->pcrel_relocs_copied; p != NULL; p = p->next) | |
627 | if (p->section == sreloc) | |
628 | break; | |
629 | ||
630 | if (p == NULL) | |
631 | { | |
632 | p = ((struct elf_m68k_pcrel_relocs_copied *) | |
633 | bfd_alloc (dynobj, sizeof *p)); | |
634 | if (p == NULL) | |
635 | return false; | |
636 | p->next = eh->pcrel_relocs_copied; | |
637 | eh->pcrel_relocs_copied = p; | |
638 | p->section = sreloc; | |
639 | p->count = 0; | |
640 | } | |
641 | ||
642 | ++p->count; | |
643 | } | |
644 | } | |
645 | ||
646 | break; | |
647 | ||
648 | /* This relocation describes the C++ object vtable hierarchy. | |
649 | Reconstruct it for later use during GC. */ | |
650 | case R_68K_GNU_VTINHERIT: | |
651 | if (!_bfd_elf32_gc_record_vtinherit (abfd, sec, h, rel->r_offset)) | |
652 | return false; | |
653 | break; | |
654 | ||
655 | /* This relocation describes which C++ vtable entries are actually | |
656 | used. Record for later use during GC. */ | |
657 | case R_68K_GNU_VTENTRY: | |
658 | if (!_bfd_elf32_gc_record_vtentry (abfd, sec, h, rel->r_addend)) | |
659 | return false; | |
660 | break; | |
661 | ||
662 | default: | |
663 | break; | |
664 | } | |
665 | } | |
666 | ||
667 | return true; | |
668 | } | |
669 | ||
670 | /* Return the section that should be marked against GC for a given | |
671 | relocation. */ | |
672 | ||
673 | static asection * | |
674 | elf_m68k_gc_mark_hook (abfd, info, rel, h, sym) | |
675 | bfd *abfd; | |
676 | struct bfd_link_info *info; | |
677 | Elf_Internal_Rela *rel; | |
678 | struct elf_link_hash_entry *h; | |
679 | Elf_Internal_Sym *sym; | |
680 | { | |
681 | if (h != NULL) | |
682 | { | |
683 | switch (ELF32_R_TYPE (rel->r_info)) | |
684 | { | |
685 | case R_68K_GNU_VTINHERIT: | |
686 | case R_68K_GNU_VTENTRY: | |
687 | break; | |
688 | ||
689 | default: | |
690 | switch (h->root.type) | |
691 | { | |
692 | default: | |
693 | break; | |
694 | ||
695 | case bfd_link_hash_defined: | |
696 | case bfd_link_hash_defweak: | |
697 | return h->root.u.def.section; | |
698 | ||
699 | case bfd_link_hash_common: | |
700 | return h->root.u.c.p->section; | |
701 | } | |
702 | } | |
703 | } | |
704 | else | |
705 | { | |
706 | if (!(elf_bad_symtab (abfd) | |
707 | && ELF_ST_BIND (sym->st_info) != STB_LOCAL) | |
708 | && ! ((sym->st_shndx <= 0 || sym->st_shndx >= SHN_LORESERVE) | |
709 | && sym->st_shndx != SHN_COMMON)) | |
710 | { | |
711 | return bfd_section_from_elf_index (abfd, sym->st_shndx); | |
712 | } | |
713 | } | |
714 | ||
715 | return NULL; | |
716 | } | |
717 | ||
718 | /* Update the got entry reference counts for the section being removed. */ | |
719 | ||
720 | static boolean | |
721 | elf_m68k_gc_sweep_hook (abfd, info, sec, relocs) | |
722 | bfd *abfd; | |
723 | struct bfd_link_info *info; | |
724 | asection *sec; | |
725 | const Elf_Internal_Rela *relocs; | |
726 | { | |
727 | Elf_Internal_Shdr *symtab_hdr; | |
728 | struct elf_link_hash_entry **sym_hashes; | |
729 | bfd_signed_vma *local_got_refcounts; | |
730 | const Elf_Internal_Rela *rel, *relend; | |
731 | unsigned long r_symndx; | |
732 | struct elf_link_hash_entry *h; | |
733 | bfd *dynobj; | |
734 | asection *sgot; | |
735 | asection *srelgot; | |
736 | ||
737 | symtab_hdr = &elf_tdata (abfd)->symtab_hdr; | |
738 | sym_hashes = elf_sym_hashes (abfd); | |
739 | local_got_refcounts = elf_local_got_refcounts (abfd); | |
740 | ||
741 | dynobj = elf_hash_table (info)->dynobj; | |
742 | if (dynobj) | |
743 | { | |
744 | sgot = bfd_get_section_by_name (dynobj, ".got"); | |
745 | srelgot = bfd_get_section_by_name (dynobj, ".rela.got"); | |
746 | } | |
747 | ||
748 | relend = relocs + sec->reloc_count; | |
749 | for (rel = relocs; rel < relend; rel++) | |
750 | { | |
751 | switch (ELF32_R_TYPE (rel->r_info)) | |
752 | { | |
753 | case R_68K_GOT8: | |
754 | case R_68K_GOT16: | |
755 | case R_68K_GOT32: | |
756 | case R_68K_GOT8O: | |
757 | case R_68K_GOT16O: | |
758 | case R_68K_GOT32O: | |
759 | r_symndx = ELF32_R_SYM (rel->r_info); | |
760 | if (r_symndx >= symtab_hdr->sh_info) | |
761 | { | |
762 | h = sym_hashes[r_symndx - symtab_hdr->sh_info]; | |
763 | if (h->got.refcount > 0) | |
764 | { | |
765 | --h->got.refcount; | |
766 | if (h->got.refcount == 0) | |
767 | { | |
768 | /* We don't need the .got entry any more. */ | |
769 | sgot->_raw_size -= 4; | |
770 | srelgot->_raw_size -= sizeof (Elf32_External_Rela); | |
771 | } | |
772 | } | |
773 | } | |
774 | else | |
775 | { | |
776 | if (local_got_refcounts[r_symndx] > 0) | |
777 | { | |
778 | --local_got_refcounts[r_symndx]; | |
779 | if (local_got_refcounts[r_symndx] == 0) | |
780 | { | |
781 | /* We don't need the .got entry any more. */ | |
782 | sgot->_raw_size -= 4; | |
783 | if (info->shared) | |
784 | srelgot->_raw_size -= sizeof (Elf32_External_Rela); | |
785 | } | |
786 | } | |
787 | } | |
788 | break; | |
789 | ||
790 | case R_68K_PLT8: | |
791 | case R_68K_PLT16: | |
792 | case R_68K_PLT32: | |
793 | case R_68K_PLT8O: | |
794 | case R_68K_PLT16O: | |
795 | case R_68K_PLT32O: | |
796 | case R_68K_PC8: | |
797 | case R_68K_PC16: | |
798 | case R_68K_PC32: | |
799 | case R_68K_8: | |
800 | case R_68K_16: | |
801 | case R_68K_32: | |
802 | r_symndx = ELF32_R_SYM (rel->r_info); | |
803 | if (r_symndx >= symtab_hdr->sh_info) | |
804 | { | |
805 | h = sym_hashes[r_symndx - symtab_hdr->sh_info]; | |
806 | if (h->plt.refcount > 0) | |
807 | --h->plt.refcount; | |
808 | } | |
809 | break; | |
810 | ||
811 | default: | |
812 | break; | |
813 | } | |
814 | } | |
815 | ||
816 | return true; | |
817 | } | |
818 | ||
819 | ||
820 | /* Adjust a symbol defined by a dynamic object and referenced by a | |
821 | regular object. The current definition is in some section of the | |
822 | dynamic object, but we're not including those sections. We have to | |
823 | change the definition to something the rest of the link can | |
824 | understand. */ | |
825 | ||
826 | static boolean | |
827 | elf_m68k_adjust_dynamic_symbol (info, h) | |
828 | struct bfd_link_info *info; | |
829 | struct elf_link_hash_entry *h; | |
830 | { | |
831 | bfd *dynobj; | |
832 | asection *s; | |
833 | unsigned int power_of_two; | |
834 | ||
835 | dynobj = elf_hash_table (info)->dynobj; | |
836 | ||
837 | /* Make sure we know what is going on here. */ | |
838 | BFD_ASSERT (dynobj != NULL | |
839 | && ((h->elf_link_hash_flags & ELF_LINK_HASH_NEEDS_PLT) | |
840 | || h->weakdef != NULL | |
841 | || ((h->elf_link_hash_flags | |
842 | & ELF_LINK_HASH_DEF_DYNAMIC) != 0 | |
843 | && (h->elf_link_hash_flags | |
844 | & ELF_LINK_HASH_REF_REGULAR) != 0 | |
845 | && (h->elf_link_hash_flags | |
846 | & ELF_LINK_HASH_DEF_REGULAR) == 0))); | |
847 | ||
848 | /* If this is a function, put it in the procedure linkage table. We | |
849 | will fill in the contents of the procedure linkage table later, | |
850 | when we know the address of the .got section. */ | |
851 | if (h->type == STT_FUNC | |
852 | || (h->elf_link_hash_flags & ELF_LINK_HASH_NEEDS_PLT) != 0) | |
853 | { | |
854 | if (! info->shared | |
855 | && (h->elf_link_hash_flags & ELF_LINK_HASH_DEF_DYNAMIC) == 0 | |
856 | && (h->elf_link_hash_flags & ELF_LINK_HASH_REF_DYNAMIC) == 0 | |
857 | /* We must always create the plt entry if it was referenced | |
858 | by a PLTxxO relocation. In this case we already recorded | |
859 | it as a dynamic symbol. */ | |
860 | && h->dynindx == -1) | |
861 | { | |
862 | /* This case can occur if we saw a PLTxx reloc in an input | |
863 | file, but the symbol was never referred to by a dynamic | |
864 | object. In such a case, we don't actually need to build | |
865 | a procedure linkage table, and we can just do a PCxx | |
866 | reloc instead. */ | |
867 | BFD_ASSERT ((h->elf_link_hash_flags & ELF_LINK_HASH_NEEDS_PLT) != 0); | |
868 | h->plt.offset = (bfd_vma) -1; | |
869 | return true; | |
870 | } | |
871 | ||
872 | /* GC may have rendered this entry unused. */ | |
873 | if (h->plt.refcount <= 0) | |
874 | { | |
875 | h->elf_link_hash_flags &= ~ELF_LINK_HASH_NEEDS_PLT; | |
876 | h->plt.offset = (bfd_vma) -1; | |
877 | return true; | |
878 | } | |
879 | ||
880 | /* Make sure this symbol is output as a dynamic symbol. */ | |
881 | if (h->dynindx == -1) | |
882 | { | |
883 | if (! bfd_elf32_link_record_dynamic_symbol (info, h)) | |
884 | return false; | |
885 | } | |
886 | ||
887 | s = bfd_get_section_by_name (dynobj, ".plt"); | |
888 | BFD_ASSERT (s != NULL); | |
889 | ||
890 | /* If this is the first .plt entry, make room for the special | |
891 | first entry. */ | |
892 | if (s->_raw_size == 0) | |
893 | s->_raw_size += PLT_ENTRY_SIZE; | |
894 | ||
895 | /* If this symbol is not defined in a regular file, and we are | |
896 | not generating a shared library, then set the symbol to this | |
897 | location in the .plt. This is required to make function | |
898 | pointers compare as equal between the normal executable and | |
899 | the shared library. */ | |
900 | if (!info->shared | |
901 | && (h->elf_link_hash_flags & ELF_LINK_HASH_DEF_REGULAR) == 0) | |
902 | { | |
903 | h->root.u.def.section = s; | |
904 | h->root.u.def.value = s->_raw_size; | |
905 | } | |
906 | ||
907 | h->plt.offset = s->_raw_size; | |
908 | ||
909 | /* Make room for this entry. */ | |
910 | s->_raw_size += PLT_ENTRY_SIZE; | |
911 | ||
912 | /* We also need to make an entry in the .got.plt section, which | |
913 | will be placed in the .got section by the linker script. */ | |
914 | ||
915 | s = bfd_get_section_by_name (dynobj, ".got.plt"); | |
916 | BFD_ASSERT (s != NULL); | |
917 | s->_raw_size += 4; | |
918 | ||
919 | /* We also need to make an entry in the .rela.plt section. */ | |
920 | ||
921 | s = bfd_get_section_by_name (dynobj, ".rela.plt"); | |
922 | BFD_ASSERT (s != NULL); | |
923 | s->_raw_size += sizeof (Elf32_External_Rela); | |
924 | ||
925 | return true; | |
926 | } | |
927 | ||
928 | /* Reinitialize the plt offset now that it is not used as a reference | |
929 | count any more. */ | |
930 | h->plt.offset = (bfd_vma) -1; | |
931 | ||
932 | /* If this is a weak symbol, and there is a real definition, the | |
933 | processor independent code will have arranged for us to see the | |
934 | real definition first, and we can just use the same value. */ | |
935 | if (h->weakdef != NULL) | |
936 | { | |
937 | BFD_ASSERT (h->weakdef->root.type == bfd_link_hash_defined | |
938 | || h->weakdef->root.type == bfd_link_hash_defweak); | |
939 | h->root.u.def.section = h->weakdef->root.u.def.section; | |
940 | h->root.u.def.value = h->weakdef->root.u.def.value; | |
941 | return true; | |
942 | } | |
943 | ||
944 | /* This is a reference to a symbol defined by a dynamic object which | |
945 | is not a function. */ | |
946 | ||
947 | /* If we are creating a shared library, we must presume that the | |
948 | only references to the symbol are via the global offset table. | |
949 | For such cases we need not do anything here; the relocations will | |
950 | be handled correctly by relocate_section. */ | |
951 | if (info->shared) | |
952 | return true; | |
953 | ||
954 | /* We must allocate the symbol in our .dynbss section, which will | |
955 | become part of the .bss section of the executable. There will be | |
956 | an entry for this symbol in the .dynsym section. The dynamic | |
957 | object will contain position independent code, so all references | |
958 | from the dynamic object to this symbol will go through the global | |
959 | offset table. The dynamic linker will use the .dynsym entry to | |
960 | determine the address it must put in the global offset table, so | |
961 | both the dynamic object and the regular object will refer to the | |
962 | same memory location for the variable. */ | |
963 | ||
964 | s = bfd_get_section_by_name (dynobj, ".dynbss"); | |
965 | BFD_ASSERT (s != NULL); | |
966 | ||
967 | /* We must generate a R_68K_COPY reloc to tell the dynamic linker to | |
968 | copy the initial value out of the dynamic object and into the | |
969 | runtime process image. We need to remember the offset into the | |
970 | .rela.bss section we are going to use. */ | |
971 | if ((h->root.u.def.section->flags & SEC_ALLOC) != 0) | |
972 | { | |
973 | asection *srel; | |
974 | ||
975 | srel = bfd_get_section_by_name (dynobj, ".rela.bss"); | |
976 | BFD_ASSERT (srel != NULL); | |
977 | srel->_raw_size += sizeof (Elf32_External_Rela); | |
978 | h->elf_link_hash_flags |= ELF_LINK_HASH_NEEDS_COPY; | |
979 | } | |
980 | ||
981 | /* We need to figure out the alignment required for this symbol. I | |
982 | have no idea how ELF linkers handle this. */ | |
983 | power_of_two = bfd_log2 (h->size); | |
984 | if (power_of_two > 3) | |
985 | power_of_two = 3; | |
986 | ||
987 | /* Apply the required alignment. */ | |
988 | s->_raw_size = BFD_ALIGN (s->_raw_size, | |
989 | (bfd_size_type) (1 << power_of_two)); | |
990 | if (power_of_two > bfd_get_section_alignment (dynobj, s)) | |
991 | { | |
992 | if (!bfd_set_section_alignment (dynobj, s, power_of_two)) | |
993 | return false; | |
994 | } | |
995 | ||
996 | /* Define the symbol as being at this point in the section. */ | |
997 | h->root.u.def.section = s; | |
998 | h->root.u.def.value = s->_raw_size; | |
999 | ||
1000 | /* Increment the section size to make room for the symbol. */ | |
1001 | s->_raw_size += h->size; | |
1002 | ||
1003 | return true; | |
1004 | } | |
1005 | ||
1006 | /* Set the sizes of the dynamic sections. */ | |
1007 | ||
1008 | static boolean | |
1009 | elf_m68k_size_dynamic_sections (output_bfd, info) | |
1010 | bfd *output_bfd; | |
1011 | struct bfd_link_info *info; | |
1012 | { | |
1013 | bfd *dynobj; | |
1014 | asection *s; | |
1015 | boolean plt; | |
1016 | boolean relocs; | |
1017 | boolean reltext; | |
1018 | ||
1019 | dynobj = elf_hash_table (info)->dynobj; | |
1020 | BFD_ASSERT (dynobj != NULL); | |
1021 | ||
1022 | if (elf_hash_table (info)->dynamic_sections_created) | |
1023 | { | |
1024 | /* Set the contents of the .interp section to the interpreter. */ | |
1025 | if (!info->shared) | |
1026 | { | |
1027 | s = bfd_get_section_by_name (dynobj, ".interp"); | |
1028 | BFD_ASSERT (s != NULL); | |
1029 | s->_raw_size = sizeof ELF_DYNAMIC_INTERPRETER; | |
1030 | s->contents = (unsigned char *) ELF_DYNAMIC_INTERPRETER; | |
1031 | } | |
1032 | } | |
1033 | else | |
1034 | { | |
1035 | /* We may have created entries in the .rela.got section. | |
1036 | However, if we are not creating the dynamic sections, we will | |
1037 | not actually use these entries. Reset the size of .rela.got, | |
1038 | which will cause it to get stripped from the output file | |
1039 | below. */ | |
1040 | s = bfd_get_section_by_name (dynobj, ".rela.got"); | |
1041 | if (s != NULL) | |
1042 | s->_raw_size = 0; | |
1043 | } | |
1044 | ||
1045 | /* If this is a -Bsymbolic shared link, then we need to discard all PC | |
1046 | relative relocs against symbols defined in a regular object. We | |
1047 | allocated space for them in the check_relocs routine, but we will not | |
1048 | fill them in in the relocate_section routine. */ | |
1049 | if (info->shared && info->symbolic) | |
1050 | elf_m68k_link_hash_traverse (elf_m68k_hash_table (info), | |
1051 | elf_m68k_discard_copies, | |
1052 | (PTR) NULL); | |
1053 | ||
1054 | /* The check_relocs and adjust_dynamic_symbol entry points have | |
1055 | determined the sizes of the various dynamic sections. Allocate | |
1056 | memory for them. */ | |
1057 | plt = false; | |
1058 | relocs = false; | |
1059 | reltext = false; | |
1060 | for (s = dynobj->sections; s != NULL; s = s->next) | |
1061 | { | |
1062 | const char *name; | |
1063 | boolean strip; | |
1064 | ||
1065 | if ((s->flags & SEC_LINKER_CREATED) == 0) | |
1066 | continue; | |
1067 | ||
1068 | /* It's OK to base decisions on the section name, because none | |
1069 | of the dynobj section names depend upon the input files. */ | |
1070 | name = bfd_get_section_name (dynobj, s); | |
1071 | ||
1072 | strip = false; | |
1073 | ||
1074 | if (strcmp (name, ".plt") == 0) | |
1075 | { | |
1076 | if (s->_raw_size == 0) | |
1077 | { | |
1078 | /* Strip this section if we don't need it; see the | |
1079 | comment below. */ | |
1080 | strip = true; | |
1081 | } | |
1082 | else | |
1083 | { | |
1084 | /* Remember whether there is a PLT. */ | |
1085 | plt = true; | |
1086 | } | |
1087 | } | |
1088 | else if (strncmp (name, ".rela", 5) == 0) | |
1089 | { | |
1090 | if (s->_raw_size == 0) | |
1091 | { | |
1092 | /* If we don't need this section, strip it from the | |
1093 | output file. This is mostly to handle .rela.bss and | |
1094 | .rela.plt. We must create both sections in | |
1095 | create_dynamic_sections, because they must be created | |
1096 | before the linker maps input sections to output | |
1097 | sections. The linker does that before | |
1098 | adjust_dynamic_symbol is called, and it is that | |
1099 | function which decides whether anything needs to go | |
1100 | into these sections. */ | |
1101 | strip = true; | |
1102 | } | |
1103 | else | |
1104 | { | |
1105 | asection *target; | |
1106 | ||
1107 | /* Remember whether there are any reloc sections other | |
1108 | than .rela.plt. */ | |
1109 | if (strcmp (name, ".rela.plt") != 0) | |
1110 | { | |
1111 | const char *outname; | |
1112 | ||
1113 | relocs = true; | |
1114 | ||
1115 | /* If this relocation section applies to a read only | |
1116 | section, then we probably need a DT_TEXTREL | |
1117 | entry. .rela.plt is actually associated with | |
1118 | .got.plt, which is never readonly. */ | |
1119 | outname = bfd_get_section_name (output_bfd, | |
1120 | s->output_section); | |
1121 | target = bfd_get_section_by_name (output_bfd, outname + 5); | |
1122 | if (target != NULL | |
1123 | && (target->flags & SEC_READONLY) != 0 | |
1124 | && (target->flags & SEC_ALLOC) != 0) | |
1125 | reltext = true; | |
1126 | } | |
1127 | ||
1128 | /* We use the reloc_count field as a counter if we need | |
1129 | to copy relocs into the output file. */ | |
1130 | s->reloc_count = 0; | |
1131 | } | |
1132 | } | |
1133 | else if (strncmp (name, ".got", 4) != 0) | |
1134 | { | |
1135 | /* It's not one of our sections, so don't allocate space. */ | |
1136 | continue; | |
1137 | } | |
1138 | ||
1139 | if (strip) | |
1140 | { | |
1141 | _bfd_strip_section_from_output (s); | |
1142 | continue; | |
1143 | } | |
1144 | ||
1145 | /* Allocate memory for the section contents. */ | |
1146 | s->contents = (bfd_byte *) bfd_alloc (dynobj, s->_raw_size); | |
1147 | if (s->contents == NULL && s->_raw_size != 0) | |
1148 | return false; | |
1149 | } | |
1150 | ||
1151 | if (elf_hash_table (info)->dynamic_sections_created) | |
1152 | { | |
1153 | /* Add some entries to the .dynamic section. We fill in the | |
1154 | values later, in elf_m68k_finish_dynamic_sections, but we | |
1155 | must add the entries now so that we get the correct size for | |
1156 | the .dynamic section. The DT_DEBUG entry is filled in by the | |
1157 | dynamic linker and used by the debugger. */ | |
1158 | if (!info->shared) | |
1159 | { | |
1160 | if (!bfd_elf32_add_dynamic_entry (info, DT_DEBUG, 0)) | |
1161 | return false; | |
1162 | } | |
1163 | ||
1164 | if (plt) | |
1165 | { | |
1166 | if (!bfd_elf32_add_dynamic_entry (info, DT_PLTGOT, 0) | |
1167 | || !bfd_elf32_add_dynamic_entry (info, DT_PLTRELSZ, 0) | |
1168 | || !bfd_elf32_add_dynamic_entry (info, DT_PLTREL, DT_RELA) | |
1169 | || !bfd_elf32_add_dynamic_entry (info, DT_JMPREL, 0)) | |
1170 | return false; | |
1171 | } | |
1172 | ||
1173 | if (relocs) | |
1174 | { | |
1175 | if (!bfd_elf32_add_dynamic_entry (info, DT_RELA, 0) | |
1176 | || !bfd_elf32_add_dynamic_entry (info, DT_RELASZ, 0) | |
1177 | || !bfd_elf32_add_dynamic_entry (info, DT_RELAENT, | |
1178 | sizeof (Elf32_External_Rela))) | |
1179 | return false; | |
1180 | } | |
1181 | ||
1182 | if (reltext) | |
1183 | { | |
1184 | if (!bfd_elf32_add_dynamic_entry (info, DT_TEXTREL, 0)) | |
1185 | return false; | |
1186 | } | |
1187 | } | |
1188 | ||
1189 | /* If we are generating a shared library, we generate a section | |
1190 | symbol for each output section for which we might need to copy | |
1191 | relocs. These are local symbols, which means that they must come | |
1192 | first in the dynamic symbol table. That means we must increment | |
1193 | the dynamic symbol index of every other dynamic symbol. */ | |
1194 | if (info->shared) | |
1195 | { | |
1196 | int c; | |
1197 | ||
1198 | c = 0; | |
1199 | for (s = output_bfd->sections; s != NULL; s = s->next) | |
1200 | { | |
1201 | if ((s->flags & SEC_LINKER_CREATED) != 0 | |
1202 | || (s->flags & SEC_ALLOC) == 0) | |
1203 | continue; | |
1204 | ||
1205 | elf_section_data (s)->dynindx = c + 1; | |
1206 | ||
1207 | /* These symbols will have no names, so we don't need to | |
1208 | fiddle with dynstr_index. */ | |
1209 | ||
1210 | ++c; | |
1211 | } | |
1212 | ||
1213 | elf_link_hash_traverse (elf_hash_table (info), | |
1214 | elf_m68k_adjust_dynindx, | |
1215 | (PTR) &c); | |
1216 | elf_hash_table (info)->dynsymcount += c; | |
1217 | } | |
1218 | ||
1219 | return true; | |
1220 | } | |
1221 | ||
1222 | /* Increment the index of a dynamic symbol by a given amount. Called | |
1223 | via elf_link_hash_traverse. */ | |
1224 | ||
1225 | static boolean | |
1226 | elf_m68k_adjust_dynindx (h, cparg) | |
1227 | struct elf_link_hash_entry *h; | |
1228 | PTR cparg; | |
1229 | { | |
1230 | int *cp = (int *) cparg; | |
1231 | ||
1232 | if (h->dynindx != -1) | |
1233 | h->dynindx += *cp; | |
1234 | return true; | |
1235 | } | |
1236 | ||
1237 | /* This function is called via elf_m68k_link_hash_traverse if we are | |
1238 | creating a shared object with -Bsymbolic. It discards the space | |
1239 | allocated to copy PC relative relocs against symbols which are defined | |
1240 | in regular objects. We allocated space for them in the check_relocs | |
1241 | routine, but we won't fill them in in the relocate_section routine. */ | |
1242 | ||
1243 | /*ARGSUSED*/ | |
1244 | static boolean | |
1245 | elf_m68k_discard_copies (h, ignore) | |
1246 | struct elf_m68k_link_hash_entry *h; | |
1247 | PTR ignore; | |
1248 | { | |
1249 | struct elf_m68k_pcrel_relocs_copied *s; | |
1250 | ||
1251 | /* We only discard relocs for symbols defined in a regular object. */ | |
1252 | if ((h->root.elf_link_hash_flags & ELF_LINK_HASH_DEF_REGULAR) == 0) | |
1253 | return true; | |
1254 | ||
1255 | for (s = h->pcrel_relocs_copied; s != NULL; s = s->next) | |
1256 | s->section->_raw_size -= s->count * sizeof (Elf32_External_Rela); | |
1257 | ||
1258 | return true; | |
1259 | } | |
1260 | ||
1261 | /* Relocate an M68K ELF section. */ | |
1262 | ||
1263 | static boolean | |
1264 | elf_m68k_relocate_section (output_bfd, info, input_bfd, input_section, | |
1265 | contents, relocs, local_syms, local_sections) | |
1266 | bfd *output_bfd; | |
1267 | struct bfd_link_info *info; | |
1268 | bfd *input_bfd; | |
1269 | asection *input_section; | |
1270 | bfd_byte *contents; | |
1271 | Elf_Internal_Rela *relocs; | |
1272 | Elf_Internal_Sym *local_syms; | |
1273 | asection **local_sections; | |
1274 | { | |
1275 | bfd *dynobj; | |
1276 | Elf_Internal_Shdr *symtab_hdr; | |
1277 | struct elf_link_hash_entry **sym_hashes; | |
1278 | bfd_vma *local_got_offsets; | |
1279 | asection *sgot; | |
1280 | asection *splt; | |
1281 | asection *sreloc; | |
1282 | Elf_Internal_Rela *rel; | |
1283 | Elf_Internal_Rela *relend; | |
1284 | ||
1285 | dynobj = elf_hash_table (info)->dynobj; | |
1286 | symtab_hdr = &elf_tdata (input_bfd)->symtab_hdr; | |
1287 | sym_hashes = elf_sym_hashes (input_bfd); | |
1288 | local_got_offsets = elf_local_got_offsets (input_bfd); | |
1289 | ||
1290 | sgot = NULL; | |
1291 | splt = NULL; | |
1292 | sreloc = NULL; | |
1293 | ||
1294 | rel = relocs; | |
1295 | relend = relocs + input_section->reloc_count; | |
1296 | for (; rel < relend; rel++) | |
1297 | { | |
1298 | int r_type; | |
1299 | reloc_howto_type *howto; | |
1300 | unsigned long r_symndx; | |
1301 | struct elf_link_hash_entry *h; | |
1302 | Elf_Internal_Sym *sym; | |
1303 | asection *sec; | |
1304 | bfd_vma relocation; | |
1305 | bfd_reloc_status_type r; | |
1306 | ||
1307 | r_type = ELF32_R_TYPE (rel->r_info); | |
1308 | if (r_type < 0 || r_type >= (int) R_68K_max) | |
1309 | { | |
1310 | bfd_set_error (bfd_error_bad_value); | |
1311 | return false; | |
1312 | } | |
1313 | howto = howto_table + r_type; | |
1314 | ||
1315 | r_symndx = ELF32_R_SYM (rel->r_info); | |
1316 | ||
1317 | if (info->relocateable) | |
1318 | { | |
1319 | /* This is a relocateable link. We don't have to change | |
1320 | anything, unless the reloc is against a section symbol, | |
1321 | in which case we have to adjust according to where the | |
1322 | section symbol winds up in the output section. */ | |
1323 | if (r_symndx < symtab_hdr->sh_info) | |
1324 | { | |
1325 | sym = local_syms + r_symndx; | |
1326 | if (ELF_ST_TYPE (sym->st_info) == STT_SECTION) | |
1327 | { | |
1328 | sec = local_sections[r_symndx]; | |
1329 | rel->r_addend += sec->output_offset + sym->st_value; | |
1330 | } | |
1331 | } | |
1332 | ||
1333 | continue; | |
1334 | } | |
1335 | ||
1336 | /* This is a final link. */ | |
1337 | h = NULL; | |
1338 | sym = NULL; | |
1339 | sec = NULL; | |
1340 | if (r_symndx < symtab_hdr->sh_info) | |
1341 | { | |
1342 | sym = local_syms + r_symndx; | |
1343 | sec = local_sections[r_symndx]; | |
1344 | relocation = (sec->output_section->vma | |
1345 | + sec->output_offset | |
1346 | + sym->st_value); | |
1347 | } | |
1348 | else | |
1349 | { | |
1350 | h = sym_hashes[r_symndx - symtab_hdr->sh_info]; | |
1351 | while (h->root.type == bfd_link_hash_indirect | |
1352 | || h->root.type == bfd_link_hash_warning) | |
1353 | h = (struct elf_link_hash_entry *) h->root.u.i.link; | |
1354 | if (h->root.type == bfd_link_hash_defined | |
1355 | || h->root.type == bfd_link_hash_defweak) | |
1356 | { | |
1357 | sec = h->root.u.def.section; | |
1358 | if (((r_type == R_68K_PLT8 | |
1359 | || r_type == R_68K_PLT16 | |
1360 | || r_type == R_68K_PLT32 | |
1361 | || r_type == R_68K_PLT8O | |
1362 | || r_type == R_68K_PLT16O | |
1363 | || r_type == R_68K_PLT32O) | |
1364 | && h->plt.offset != (bfd_vma) -1 | |
1365 | && elf_hash_table (info)->dynamic_sections_created) | |
1366 | || ((r_type == R_68K_GOT8O | |
1367 | || r_type == R_68K_GOT16O | |
1368 | || r_type == R_68K_GOT32O | |
1369 | || ((r_type == R_68K_GOT8 | |
1370 | || r_type == R_68K_GOT16 | |
1371 | || r_type == R_68K_GOT32) | |
1372 | && strcmp (h->root.root.string, | |
1373 | "_GLOBAL_OFFSET_TABLE_") != 0)) | |
1374 | && elf_hash_table (info)->dynamic_sections_created | |
1375 | && (! info->shared | |
1376 | || (! info->symbolic && h->dynindx != -1) | |
1377 | || (h->elf_link_hash_flags | |
1378 | & ELF_LINK_HASH_DEF_REGULAR) == 0)) | |
1379 | || (info->shared | |
1380 | && ((! info->symbolic && h->dynindx != -1) | |
1381 | || (h->elf_link_hash_flags | |
1382 | & ELF_LINK_HASH_DEF_REGULAR) == 0) | |
1383 | && (input_section->flags & SEC_ALLOC) != 0 | |
1384 | && (r_type == R_68K_8 | |
1385 | || r_type == R_68K_16 | |
1386 | || r_type == R_68K_32 | |
1387 | || r_type == R_68K_PC8 | |
1388 | || r_type == R_68K_PC16 | |
1389 | || r_type == R_68K_PC32))) | |
1390 | { | |
1391 | /* In these cases, we don't need the relocation | |
1392 | value. We check specially because in some | |
1393 | obscure cases sec->output_section will be NULL. */ | |
1394 | relocation = 0; | |
1395 | } | |
1396 | else | |
1397 | relocation = (h->root.u.def.value | |
1398 | + sec->output_section->vma | |
1399 | + sec->output_offset); | |
1400 | } | |
1401 | else if (h->root.type == bfd_link_hash_undefweak) | |
1402 | relocation = 0; | |
1403 | else if (info->shared && !info->symbolic && !info->no_undefined) | |
1404 | relocation = 0; | |
1405 | else | |
1406 | { | |
1407 | if (!(info->callbacks->undefined_symbol | |
1408 | (info, h->root.root.string, input_bfd, | |
1409 | input_section, rel->r_offset))) | |
1410 | return false; | |
1411 | relocation = 0; | |
1412 | } | |
1413 | } | |
1414 | ||
1415 | switch (r_type) | |
1416 | { | |
1417 | case R_68K_GOT8: | |
1418 | case R_68K_GOT16: | |
1419 | case R_68K_GOT32: | |
1420 | /* Relocation is to the address of the entry for this symbol | |
1421 | in the global offset table. */ | |
1422 | if (h != NULL | |
1423 | && strcmp (h->root.root.string, "_GLOBAL_OFFSET_TABLE_") == 0) | |
1424 | break; | |
1425 | /* Fall through. */ | |
1426 | case R_68K_GOT8O: | |
1427 | case R_68K_GOT16O: | |
1428 | case R_68K_GOT32O: | |
1429 | /* Relocation is the offset of the entry for this symbol in | |
1430 | the global offset table. */ | |
1431 | ||
1432 | { | |
1433 | bfd_vma off; | |
1434 | ||
1435 | if (sgot == NULL) | |
1436 | { | |
1437 | sgot = bfd_get_section_by_name (dynobj, ".got"); | |
1438 | BFD_ASSERT (sgot != NULL); | |
1439 | } | |
1440 | ||
1441 | if (h != NULL) | |
1442 | { | |
1443 | off = h->got.offset; | |
1444 | BFD_ASSERT (off != (bfd_vma) -1); | |
1445 | ||
1446 | if (!elf_hash_table (info)->dynamic_sections_created | |
1447 | || (info->shared | |
1448 | && (info->symbolic || h->dynindx == -1) | |
1449 | && (h->elf_link_hash_flags & ELF_LINK_HASH_DEF_REGULAR))) | |
1450 | { | |
1451 | /* This is actually a static link, or it is a | |
1452 | -Bsymbolic link and the symbol is defined | |
1453 | locally, or the symbol was forced to be local | |
1454 | because of a version file.. We must initialize | |
1455 | this entry in the global offset table. Since | |
1456 | the offset must always be a multiple of 4, we | |
1457 | use the least significant bit to record whether | |
1458 | we have initialized it already. | |
1459 | ||
1460 | When doing a dynamic link, we create a .rela.got | |
1461 | relocation entry to initialize the value. This | |
1462 | is done in the finish_dynamic_symbol routine. */ | |
1463 | if ((off & 1) != 0) | |
1464 | off &= ~1; | |
1465 | else | |
1466 | { | |
1467 | bfd_put_32 (output_bfd, relocation, | |
1468 | sgot->contents + off); | |
1469 | h->got.offset |= 1; | |
1470 | } | |
1471 | } | |
1472 | } | |
1473 | else | |
1474 | { | |
1475 | BFD_ASSERT (local_got_offsets != NULL | |
1476 | && local_got_offsets[r_symndx] != (bfd_vma) -1); | |
1477 | ||
1478 | off = local_got_offsets[r_symndx]; | |
1479 | ||
1480 | /* The offset must always be a multiple of 4. We use | |
1481 | the least significant bit to record whether we have | |
1482 | already generated the necessary reloc. */ | |
1483 | if ((off & 1) != 0) | |
1484 | off &= ~1; | |
1485 | else | |
1486 | { | |
1487 | bfd_put_32 (output_bfd, relocation, sgot->contents + off); | |
1488 | ||
1489 | if (info->shared) | |
1490 | { | |
1491 | asection *srelgot; | |
1492 | Elf_Internal_Rela outrel; | |
1493 | ||
1494 | srelgot = bfd_get_section_by_name (dynobj, ".rela.got"); | |
1495 | BFD_ASSERT (srelgot != NULL); | |
1496 | ||
1497 | outrel.r_offset = (sgot->output_section->vma | |
1498 | + sgot->output_offset | |
1499 | + off); | |
1500 | outrel.r_info = ELF32_R_INFO (0, R_68K_RELATIVE); | |
1501 | outrel.r_addend = relocation; | |
1502 | bfd_elf32_swap_reloca_out (output_bfd, &outrel, | |
1503 | (((Elf32_External_Rela *) | |
1504 | srelgot->contents) | |
1505 | + srelgot->reloc_count)); | |
1506 | ++srelgot->reloc_count; | |
1507 | } | |
1508 | ||
1509 | local_got_offsets[r_symndx] |= 1; | |
1510 | } | |
1511 | } | |
1512 | ||
1513 | relocation = sgot->output_offset + off; | |
1514 | if (r_type == R_68K_GOT8O | |
1515 | || r_type == R_68K_GOT16O | |
1516 | || r_type == R_68K_GOT32O) | |
1517 | { | |
1518 | /* This relocation does not use the addend. */ | |
1519 | rel->r_addend = 0; | |
1520 | } | |
1521 | else | |
1522 | relocation += sgot->output_section->vma; | |
1523 | } | |
1524 | break; | |
1525 | ||
1526 | case R_68K_PLT8: | |
1527 | case R_68K_PLT16: | |
1528 | case R_68K_PLT32: | |
1529 | /* Relocation is to the entry for this symbol in the | |
1530 | procedure linkage table. */ | |
1531 | ||
1532 | /* Resolve a PLTxx reloc against a local symbol directly, | |
1533 | without using the procedure linkage table. */ | |
1534 | if (h == NULL) | |
1535 | break; | |
1536 | ||
1537 | if (h->plt.offset == (bfd_vma) -1 | |
1538 | || !elf_hash_table (info)->dynamic_sections_created) | |
1539 | { | |
1540 | /* We didn't make a PLT entry for this symbol. This | |
1541 | happens when statically linking PIC code, or when | |
1542 | using -Bsymbolic. */ | |
1543 | break; | |
1544 | } | |
1545 | ||
1546 | if (splt == NULL) | |
1547 | { | |
1548 | splt = bfd_get_section_by_name (dynobj, ".plt"); | |
1549 | BFD_ASSERT (splt != NULL); | |
1550 | } | |
1551 | ||
1552 | relocation = (splt->output_section->vma | |
1553 | + splt->output_offset | |
1554 | + h->plt.offset); | |
1555 | break; | |
1556 | ||
1557 | case R_68K_PLT8O: | |
1558 | case R_68K_PLT16O: | |
1559 | case R_68K_PLT32O: | |
1560 | /* Relocation is the offset of the entry for this symbol in | |
1561 | the procedure linkage table. */ | |
1562 | BFD_ASSERT (h != NULL && h->plt.offset != (bfd_vma) -1); | |
1563 | ||
1564 | if (splt == NULL) | |
1565 | { | |
1566 | splt = bfd_get_section_by_name (dynobj, ".plt"); | |
1567 | BFD_ASSERT (splt != NULL); | |
1568 | } | |
1569 | ||
1570 | relocation = h->plt.offset; | |
1571 | ||
1572 | /* This relocation does not use the addend. */ | |
1573 | rel->r_addend = 0; | |
1574 | ||
1575 | break; | |
1576 | ||
1577 | case R_68K_PC8: | |
1578 | case R_68K_PC16: | |
1579 | case R_68K_PC32: | |
1580 | if (h == NULL) | |
1581 | break; | |
1582 | /* Fall through. */ | |
1583 | case R_68K_8: | |
1584 | case R_68K_16: | |
1585 | case R_68K_32: | |
1586 | if (info->shared | |
1587 | && (input_section->flags & SEC_ALLOC) != 0 | |
1588 | && ((r_type != R_68K_PC8 | |
1589 | && r_type != R_68K_PC16 | |
1590 | && r_type != R_68K_PC32) | |
1591 | || (!info->symbolic | |
1592 | || (h->elf_link_hash_flags | |
1593 | & ELF_LINK_HASH_DEF_REGULAR) == 0))) | |
1594 | { | |
1595 | Elf_Internal_Rela outrel; | |
1596 | boolean skip, relocate; | |
1597 | ||
1598 | /* When generating a shared object, these relocations | |
1599 | are copied into the output file to be resolved at run | |
1600 | time. */ | |
1601 | ||
1602 | if (sreloc == NULL) | |
1603 | { | |
1604 | const char *name; | |
1605 | ||
1606 | name = (bfd_elf_string_from_elf_section | |
1607 | (input_bfd, | |
1608 | elf_elfheader (input_bfd)->e_shstrndx, | |
1609 | elf_section_data (input_section)->rel_hdr.sh_name)); | |
1610 | if (name == NULL) | |
1611 | return false; | |
1612 | ||
1613 | BFD_ASSERT (strncmp (name, ".rela", 5) == 0 | |
1614 | && strcmp (bfd_get_section_name (input_bfd, | |
1615 | input_section), | |
1616 | name + 5) == 0); | |
1617 | ||
1618 | sreloc = bfd_get_section_by_name (dynobj, name); | |
1619 | BFD_ASSERT (sreloc != NULL); | |
1620 | } | |
1621 | ||
1622 | skip = false; | |
1623 | ||
1624 | if (elf_section_data (input_section)->stab_info == NULL) | |
1625 | outrel.r_offset = rel->r_offset; | |
1626 | else | |
1627 | { | |
1628 | bfd_vma off; | |
1629 | ||
1630 | off = (_bfd_stab_section_offset | |
1631 | (output_bfd, &elf_hash_table (info)->stab_info, | |
1632 | input_section, | |
1633 | &elf_section_data (input_section)->stab_info, | |
1634 | rel->r_offset)); | |
1635 | if (off == (bfd_vma) -1) | |
1636 | skip = true; | |
1637 | outrel.r_offset = off; | |
1638 | } | |
1639 | ||
1640 | outrel.r_offset += (input_section->output_section->vma | |
1641 | + input_section->output_offset); | |
1642 | ||
1643 | if (skip) | |
1644 | { | |
1645 | memset (&outrel, 0, sizeof outrel); | |
1646 | relocate = false; | |
1647 | } | |
1648 | /* h->dynindx may be -1 if the symbol was marked to | |
1649 | become local. */ | |
1650 | else if (h != NULL | |
1651 | && ((! info->symbolic && h->dynindx != -1) | |
1652 | || (h->elf_link_hash_flags | |
1653 | & ELF_LINK_HASH_DEF_REGULAR) == 0)) | |
1654 | { | |
1655 | BFD_ASSERT (h->dynindx != -1); | |
1656 | relocate = false; | |
1657 | outrel.r_info = ELF32_R_INFO (h->dynindx, r_type); | |
1658 | outrel.r_addend = relocation + rel->r_addend; | |
1659 | } | |
1660 | else | |
1661 | { | |
1662 | if (r_type == R_68K_32) | |
1663 | { | |
1664 | relocate = true; | |
1665 | outrel.r_info = ELF32_R_INFO (0, R_68K_RELATIVE); | |
1666 | outrel.r_addend = relocation + rel->r_addend; | |
1667 | } | |
1668 | else | |
1669 | { | |
1670 | long indx; | |
1671 | ||
1672 | if (h == NULL) | |
1673 | sec = local_sections[r_symndx]; | |
1674 | else | |
1675 | { | |
1676 | BFD_ASSERT (h->root.type == bfd_link_hash_defined | |
1677 | || (h->root.type | |
1678 | == bfd_link_hash_defweak)); | |
1679 | sec = h->root.u.def.section; | |
1680 | } | |
1681 | if (sec != NULL && bfd_is_abs_section (sec)) | |
1682 | indx = 0; | |
1683 | else if (sec == NULL || sec->owner == NULL) | |
1684 | { | |
1685 | bfd_set_error (bfd_error_bad_value); | |
1686 | return false; | |
1687 | } | |
1688 | else | |
1689 | { | |
1690 | asection *osec; | |
1691 | ||
1692 | osec = sec->output_section; | |
1693 | indx = elf_section_data (osec)->dynindx; | |
1694 | BFD_ASSERT (indx > 0); | |
1695 | } | |
1696 | ||
1697 | relocate = false; | |
1698 | outrel.r_info = ELF32_R_INFO (indx, r_type); | |
1699 | outrel.r_addend = relocation + rel->r_addend; | |
1700 | } | |
1701 | } | |
1702 | ||
1703 | bfd_elf32_swap_reloca_out (output_bfd, &outrel, | |
1704 | (((Elf32_External_Rela *) | |
1705 | sreloc->contents) | |
1706 | + sreloc->reloc_count)); | |
1707 | ++sreloc->reloc_count; | |
1708 | ||
1709 | /* This reloc will be computed at runtime, so there's no | |
1710 | need to do anything now, except for R_68K_32 | |
1711 | relocations that have been turned into | |
1712 | R_68K_RELATIVE. */ | |
1713 | if (!relocate) | |
1714 | continue; | |
1715 | } | |
1716 | ||
1717 | break; | |
1718 | ||
1719 | case R_68K_GNU_VTINHERIT: | |
1720 | case R_68K_GNU_VTENTRY: | |
1721 | /* These are no-ops in the end. */ | |
1722 | continue; | |
1723 | ||
1724 | default: | |
1725 | break; | |
1726 | } | |
1727 | ||
1728 | r = _bfd_final_link_relocate (howto, input_bfd, input_section, | |
1729 | contents, rel->r_offset, | |
1730 | relocation, rel->r_addend); | |
1731 | ||
1732 | if (r != bfd_reloc_ok) | |
1733 | { | |
1734 | switch (r) | |
1735 | { | |
1736 | default: | |
1737 | case bfd_reloc_outofrange: | |
1738 | abort (); | |
1739 | case bfd_reloc_overflow: | |
1740 | { | |
1741 | const char *name; | |
1742 | ||
1743 | if (h != NULL) | |
1744 | name = h->root.root.string; | |
1745 | else | |
1746 | { | |
1747 | name = bfd_elf_string_from_elf_section (input_bfd, | |
1748 | symtab_hdr->sh_link, | |
1749 | sym->st_name); | |
1750 | if (name == NULL) | |
1751 | return false; | |
1752 | if (*name == '\0') | |
1753 | name = bfd_section_name (input_bfd, sec); | |
1754 | } | |
1755 | if (!(info->callbacks->reloc_overflow | |
1756 | (info, name, howto->name, (bfd_vma) 0, | |
1757 | input_bfd, input_section, rel->r_offset))) | |
1758 | return false; | |
1759 | } | |
1760 | break; | |
1761 | } | |
1762 | } | |
1763 | } | |
1764 | ||
1765 | return true; | |
1766 | } | |
1767 | ||
1768 | /* Finish up dynamic symbol handling. We set the contents of various | |
1769 | dynamic sections here. */ | |
1770 | ||
1771 | static boolean | |
1772 | elf_m68k_finish_dynamic_symbol (output_bfd, info, h, sym) | |
1773 | bfd *output_bfd; | |
1774 | struct bfd_link_info *info; | |
1775 | struct elf_link_hash_entry *h; | |
1776 | Elf_Internal_Sym *sym; | |
1777 | { | |
1778 | bfd *dynobj; | |
1779 | ||
1780 | dynobj = elf_hash_table (info)->dynobj; | |
1781 | ||
1782 | if (h->plt.offset != (bfd_vma) -1) | |
1783 | { | |
1784 | asection *splt; | |
1785 | asection *sgot; | |
1786 | asection *srela; | |
1787 | bfd_vma plt_index; | |
1788 | bfd_vma got_offset; | |
1789 | Elf_Internal_Rela rela; | |
1790 | ||
1791 | /* This symbol has an entry in the procedure linkage table. Set | |
1792 | it up. */ | |
1793 | ||
1794 | BFD_ASSERT (h->dynindx != -1); | |
1795 | ||
1796 | splt = bfd_get_section_by_name (dynobj, ".plt"); | |
1797 | sgot = bfd_get_section_by_name (dynobj, ".got.plt"); | |
1798 | srela = bfd_get_section_by_name (dynobj, ".rela.plt"); | |
1799 | BFD_ASSERT (splt != NULL && sgot != NULL && srela != NULL); | |
1800 | ||
1801 | /* Get the index in the procedure linkage table which | |
1802 | corresponds to this symbol. This is the index of this symbol | |
1803 | in all the symbols for which we are making plt entries. The | |
1804 | first entry in the procedure linkage table is reserved. */ | |
1805 | plt_index = h->plt.offset / PLT_ENTRY_SIZE - 1; | |
1806 | ||
1807 | /* Get the offset into the .got table of the entry that | |
1808 | corresponds to this function. Each .got entry is 4 bytes. | |
1809 | The first three are reserved. */ | |
1810 | got_offset = (plt_index + 3) * 4; | |
1811 | ||
1812 | /* Fill in the entry in the procedure linkage table. */ | |
1813 | memcpy (splt->contents + h->plt.offset, elf_m68k_plt_entry, | |
1814 | PLT_ENTRY_SIZE); | |
1815 | /* The offset is relative to the first extension word. */ | |
1816 | bfd_put_32 (output_bfd, | |
1817 | (sgot->output_section->vma | |
1818 | + sgot->output_offset | |
1819 | + got_offset | |
1820 | - (splt->output_section->vma | |
1821 | + h->plt.offset + 2)), | |
1822 | splt->contents + h->plt.offset + 4); | |
1823 | ||
1824 | bfd_put_32 (output_bfd, plt_index * sizeof (Elf32_External_Rela), | |
1825 | splt->contents + h->plt.offset + 10); | |
1826 | bfd_put_32 (output_bfd, - (h->plt.offset + 16), | |
1827 | splt->contents + h->plt.offset + 16); | |
1828 | ||
1829 | /* Fill in the entry in the global offset table. */ | |
1830 | bfd_put_32 (output_bfd, | |
1831 | (splt->output_section->vma | |
1832 | + splt->output_offset | |
1833 | + h->plt.offset | |
1834 | + 8), | |
1835 | sgot->contents + got_offset); | |
1836 | ||
1837 | /* Fill in the entry in the .rela.plt section. */ | |
1838 | rela.r_offset = (sgot->output_section->vma | |
1839 | + sgot->output_offset | |
1840 | + got_offset); | |
1841 | rela.r_info = ELF32_R_INFO (h->dynindx, R_68K_JMP_SLOT); | |
1842 | rela.r_addend = 0; | |
1843 | bfd_elf32_swap_reloca_out (output_bfd, &rela, | |
1844 | ((Elf32_External_Rela *) srela->contents | |
1845 | + plt_index)); | |
1846 | ||
1847 | if ((h->elf_link_hash_flags & ELF_LINK_HASH_DEF_REGULAR) == 0) | |
1848 | { | |
1849 | /* Mark the symbol as undefined, rather than as defined in | |
1850 | the .plt section. Leave the value alone. */ | |
1851 | sym->st_shndx = SHN_UNDEF; | |
1852 | } | |
1853 | } | |
1854 | ||
1855 | if (h->got.offset != (bfd_vma) -1) | |
1856 | { | |
1857 | asection *sgot; | |
1858 | asection *srela; | |
1859 | Elf_Internal_Rela rela; | |
1860 | ||
1861 | /* This symbol has an entry in the global offset table. Set it | |
1862 | up. */ | |
1863 | ||
1864 | sgot = bfd_get_section_by_name (dynobj, ".got"); | |
1865 | srela = bfd_get_section_by_name (dynobj, ".rela.got"); | |
1866 | BFD_ASSERT (sgot != NULL && srela != NULL); | |
1867 | ||
1868 | rela.r_offset = (sgot->output_section->vma | |
1869 | + sgot->output_offset | |
1870 | + (h->got.offset &~ 1)); | |
1871 | ||
1872 | /* If this is a -Bsymbolic link, and the symbol is defined | |
1873 | locally, we just want to emit a RELATIVE reloc. Likewise if | |
1874 | the symbol was forced to be local because of a version file. | |
1875 | The entry in the global offset table will already have been | |
1876 | initialized in the relocate_section function. */ | |
1877 | if (info->shared | |
1878 | && (info->symbolic || h->dynindx == -1) | |
1879 | && (h->elf_link_hash_flags & ELF_LINK_HASH_DEF_REGULAR)) | |
1880 | { | |
1881 | rela.r_info = ELF32_R_INFO (0, R_68K_RELATIVE); | |
1882 | rela.r_addend = bfd_get_signed_32 (output_bfd, | |
1883 | (sgot->contents | |
1884 | + (h->got.offset & ~1))); | |
1885 | } | |
1886 | else | |
1887 | { | |
1888 | bfd_put_32 (output_bfd, (bfd_vma) 0, | |
1889 | sgot->contents + (h->got.offset & ~1)); | |
1890 | rela.r_info = ELF32_R_INFO (h->dynindx, R_68K_GLOB_DAT); | |
1891 | rela.r_addend = 0; | |
1892 | } | |
1893 | ||
1894 | bfd_elf32_swap_reloca_out (output_bfd, &rela, | |
1895 | ((Elf32_External_Rela *) srela->contents | |
1896 | + srela->reloc_count)); | |
1897 | ++srela->reloc_count; | |
1898 | } | |
1899 | ||
1900 | if ((h->elf_link_hash_flags & ELF_LINK_HASH_NEEDS_COPY) != 0) | |
1901 | { | |
1902 | asection *s; | |
1903 | Elf_Internal_Rela rela; | |
1904 | ||
1905 | /* This symbol needs a copy reloc. Set it up. */ | |
1906 | ||
1907 | BFD_ASSERT (h->dynindx != -1 | |
1908 | && (h->root.type == bfd_link_hash_defined | |
1909 | || h->root.type == bfd_link_hash_defweak)); | |
1910 | ||
1911 | s = bfd_get_section_by_name (h->root.u.def.section->owner, | |
1912 | ".rela.bss"); | |
1913 | BFD_ASSERT (s != NULL); | |
1914 | ||
1915 | rela.r_offset = (h->root.u.def.value | |
1916 | + h->root.u.def.section->output_section->vma | |
1917 | + h->root.u.def.section->output_offset); | |
1918 | rela.r_info = ELF32_R_INFO (h->dynindx, R_68K_COPY); | |
1919 | rela.r_addend = 0; | |
1920 | bfd_elf32_swap_reloca_out (output_bfd, &rela, | |
1921 | ((Elf32_External_Rela *) s->contents | |
1922 | + s->reloc_count)); | |
1923 | ++s->reloc_count; | |
1924 | } | |
1925 | ||
1926 | /* Mark _DYNAMIC and _GLOBAL_OFFSET_TABLE_ as absolute. */ | |
1927 | if (strcmp (h->root.root.string, "_DYNAMIC") == 0 | |
1928 | || strcmp (h->root.root.string, "_GLOBAL_OFFSET_TABLE_") == 0) | |
1929 | sym->st_shndx = SHN_ABS; | |
1930 | ||
1931 | return true; | |
1932 | } | |
1933 | ||
1934 | /* Finish up the dynamic sections. */ | |
1935 | ||
1936 | static boolean | |
1937 | elf_m68k_finish_dynamic_sections (output_bfd, info) | |
1938 | bfd *output_bfd; | |
1939 | struct bfd_link_info *info; | |
1940 | { | |
1941 | bfd *dynobj; | |
1942 | asection *sgot; | |
1943 | asection *sdyn; | |
1944 | ||
1945 | dynobj = elf_hash_table (info)->dynobj; | |
1946 | ||
1947 | sgot = bfd_get_section_by_name (dynobj, ".got.plt"); | |
1948 | BFD_ASSERT (sgot != NULL); | |
1949 | sdyn = bfd_get_section_by_name (dynobj, ".dynamic"); | |
1950 | ||
1951 | if (elf_hash_table (info)->dynamic_sections_created) | |
1952 | { | |
1953 | asection *splt; | |
1954 | Elf32_External_Dyn *dyncon, *dynconend; | |
1955 | ||
1956 | splt = bfd_get_section_by_name (dynobj, ".plt"); | |
1957 | BFD_ASSERT (splt != NULL && sdyn != NULL); | |
1958 | ||
1959 | dyncon = (Elf32_External_Dyn *) sdyn->contents; | |
1960 | dynconend = (Elf32_External_Dyn *) (sdyn->contents + sdyn->_raw_size); | |
1961 | for (; dyncon < dynconend; dyncon++) | |
1962 | { | |
1963 | Elf_Internal_Dyn dyn; | |
1964 | const char *name; | |
1965 | asection *s; | |
1966 | ||
1967 | bfd_elf32_swap_dyn_in (dynobj, dyncon, &dyn); | |
1968 | ||
1969 | switch (dyn.d_tag) | |
1970 | { | |
1971 | default: | |
1972 | break; | |
1973 | ||
1974 | case DT_PLTGOT: | |
1975 | name = ".got"; | |
1976 | goto get_vma; | |
1977 | case DT_JMPREL: | |
1978 | name = ".rela.plt"; | |
1979 | get_vma: | |
1980 | s = bfd_get_section_by_name (output_bfd, name); | |
1981 | BFD_ASSERT (s != NULL); | |
1982 | dyn.d_un.d_ptr = s->vma; | |
1983 | bfd_elf32_swap_dyn_out (output_bfd, &dyn, dyncon); | |
1984 | break; | |
1985 | ||
1986 | case DT_PLTRELSZ: | |
1987 | s = bfd_get_section_by_name (output_bfd, ".rela.plt"); | |
1988 | BFD_ASSERT (s != NULL); | |
1989 | if (s->_cooked_size != 0) | |
1990 | dyn.d_un.d_val = s->_cooked_size; | |
1991 | else | |
1992 | dyn.d_un.d_val = s->_raw_size; | |
1993 | bfd_elf32_swap_dyn_out (output_bfd, &dyn, dyncon); | |
1994 | break; | |
1995 | ||
1996 | case DT_RELASZ: | |
1997 | /* The procedure linkage table relocs (DT_JMPREL) should | |
1998 | not be included in the overall relocs (DT_RELA). | |
1999 | Therefore, we override the DT_RELASZ entry here to | |
2000 | make it not include the JMPREL relocs. Since the | |
2001 | linker script arranges for .rela.plt to follow all | |
2002 | other relocation sections, we don't have to worry | |
2003 | about changing the DT_RELA entry. */ | |
2004 | s = bfd_get_section_by_name (output_bfd, ".rela.plt"); | |
2005 | if (s != NULL) | |
2006 | { | |
2007 | if (s->_cooked_size != 0) | |
2008 | dyn.d_un.d_val -= s->_cooked_size; | |
2009 | else | |
2010 | dyn.d_un.d_val -= s->_raw_size; | |
2011 | } | |
2012 | bfd_elf32_swap_dyn_out (output_bfd, &dyn, dyncon); | |
2013 | break; | |
2014 | } | |
2015 | } | |
2016 | ||
2017 | /* Fill in the first entry in the procedure linkage table. */ | |
2018 | if (splt->_raw_size > 0) | |
2019 | { | |
2020 | memcpy (splt->contents, elf_m68k_plt0_entry, PLT_ENTRY_SIZE); | |
2021 | bfd_put_32 (output_bfd, | |
2022 | (sgot->output_section->vma | |
2023 | + sgot->output_offset + 4 | |
2024 | - (splt->output_section->vma + 2)), | |
2025 | splt->contents + 4); | |
2026 | bfd_put_32 (output_bfd, | |
2027 | (sgot->output_section->vma | |
2028 | + sgot->output_offset + 8 | |
2029 | - (splt->output_section->vma + 10)), | |
2030 | splt->contents + 12); | |
2031 | } | |
2032 | ||
2033 | elf_section_data (splt->output_section)->this_hdr.sh_entsize | |
2034 | = PLT_ENTRY_SIZE; | |
2035 | } | |
2036 | ||
2037 | /* Fill in the first three entries in the global offset table. */ | |
2038 | if (sgot->_raw_size > 0) | |
2039 | { | |
2040 | if (sdyn == NULL) | |
2041 | bfd_put_32 (output_bfd, (bfd_vma) 0, sgot->contents); | |
2042 | else | |
2043 | bfd_put_32 (output_bfd, | |
2044 | sdyn->output_section->vma + sdyn->output_offset, | |
2045 | sgot->contents); | |
2046 | bfd_put_32 (output_bfd, (bfd_vma) 0, sgot->contents + 4); | |
2047 | bfd_put_32 (output_bfd, (bfd_vma) 0, sgot->contents + 8); | |
2048 | } | |
2049 | ||
2050 | elf_section_data (sgot->output_section)->this_hdr.sh_entsize = 4; | |
2051 | ||
2052 | if (info->shared) | |
2053 | { | |
2054 | asection *sdynsym; | |
2055 | asection *s; | |
2056 | Elf_Internal_Sym sym; | |
2057 | int c; | |
2058 | ||
2059 | /* Set up the section symbols for the output sections. */ | |
2060 | ||
2061 | sdynsym = bfd_get_section_by_name (dynobj, ".dynsym"); | |
2062 | BFD_ASSERT (sdynsym != NULL); | |
2063 | ||
2064 | sym.st_size = 0; | |
2065 | sym.st_name = 0; | |
2066 | sym.st_info = ELF_ST_INFO (STB_LOCAL, STT_SECTION); | |
2067 | sym.st_other = 0; | |
2068 | ||
2069 | c = 0; | |
2070 | for (s = output_bfd->sections; s != NULL; s = s->next) | |
2071 | { | |
2072 | int indx; | |
2073 | ||
2074 | if (elf_section_data (s)->dynindx == 0) | |
2075 | continue; | |
2076 | ||
2077 | sym.st_value = s->vma; | |
2078 | ||
2079 | indx = elf_section_data (s)->this_idx; | |
2080 | BFD_ASSERT (indx > 0); | |
2081 | sym.st_shndx = indx; | |
2082 | ||
2083 | bfd_elf32_swap_symbol_out (output_bfd, &sym, | |
2084 | (PTR) (((Elf32_External_Sym *) | |
2085 | sdynsym->contents) | |
2086 | + elf_section_data (s)->dynindx)); | |
2087 | ||
2088 | ++c; | |
2089 | } | |
2090 | ||
2091 | /* Set the sh_info field of the output .dynsym section to the | |
2092 | index of the first global symbol. */ | |
2093 | elf_section_data (sdynsym->output_section)->this_hdr.sh_info = c + 1; | |
2094 | } | |
2095 | ||
2096 | return true; | |
2097 | } | |
2098 | ||
2099 | #define TARGET_BIG_SYM bfd_elf32_m68k_vec | |
2100 | #define TARGET_BIG_NAME "elf32-m68k" | |
2101 | #define ELF_MACHINE_CODE EM_68K | |
2102 | #define ELF_MAXPAGESIZE 0x2000 | |
2103 | #define elf_backend_create_dynamic_sections \ | |
2104 | _bfd_elf_create_dynamic_sections | |
2105 | #define bfd_elf32_bfd_link_hash_table_create \ | |
2106 | elf_m68k_link_hash_table_create | |
2107 | #define bfd_elf32_bfd_final_link _bfd_elf32_gc_common_final_link | |
2108 | ||
2109 | #define elf_backend_check_relocs elf_m68k_check_relocs | |
2110 | #define elf_backend_adjust_dynamic_symbol \ | |
2111 | elf_m68k_adjust_dynamic_symbol | |
2112 | #define elf_backend_size_dynamic_sections \ | |
2113 | elf_m68k_size_dynamic_sections | |
2114 | #define elf_backend_relocate_section elf_m68k_relocate_section | |
2115 | #define elf_backend_finish_dynamic_symbol \ | |
2116 | elf_m68k_finish_dynamic_symbol | |
2117 | #define elf_backend_finish_dynamic_sections \ | |
2118 | elf_m68k_finish_dynamic_sections | |
2119 | #define elf_backend_gc_mark_hook elf_m68k_gc_mark_hook | |
2120 | #define elf_backend_gc_sweep_hook elf_m68k_gc_sweep_hook | |
2121 | #define elf_backend_can_gc_sections 1 | |
2122 | #define elf_backend_want_got_plt 1 | |
2123 | #define elf_backend_plt_readonly 1 | |
2124 | #define elf_backend_want_plt_sym 0 | |
2125 | #define elf_backend_got_header_size 12 | |
2126 | #define elf_backend_plt_header_size PLT_ENTRY_SIZE | |
2127 | ||
2128 | #include "elf32-target.h" |