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d9352518 DB |
1 | /* MeP-specific support for 32-bit ELF. |
2 | Copyright (C) 2001, 2002, 2003, 2004, 2005, 2006 | |
3 | Free Software Foundation, Inc. | |
4 | ||
5 | This file is part of BFD, the Binary File Descriptor library. | |
6 | ||
7 | This program is free software; you can redistribute it and/or modify | |
8 | it under the terms of the GNU General Public License as published by | |
9 | the Free Software Foundation; either version 2 of the License, or | |
10 | (at your option) any later version. | |
11 | ||
12 | This program is distributed in the hope that it will be useful, | |
13 | but WITHOUT ANY WARRANTY; without even the implied warranty of | |
14 | MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the | |
15 | GNU General Public License for more details. | |
16 | ||
17 | You should have received a copy of the GNU General Public License | |
18 | along with this program; if not, write to the Free Software | |
19 | Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301, USA. */ | |
20 | ||
21 | #include "bfd.h" | |
22 | #include "sysdep.h" | |
23 | #include "libbfd.h" | |
24 | #include "elf-bfd.h" | |
25 | #include "elf/mep.h" | |
26 | #include "libiberty.h" | |
27 | ||
28 | /* Forward declarations. */ | |
29 | ||
30 | /* Private relocation functions. */ | |
31 | \f | |
32 | #define MEPREL(type, size, bits, right, left, pcrel, overflow, mask) \ | |
33 | {(unsigned)type, right, size, bits, pcrel, left, overflow, mep_reloc, #type, FALSE, 0, mask, 0 } | |
34 | ||
35 | #define N complain_overflow_dont | |
36 | #define S complain_overflow_signed | |
37 | #define U complain_overflow_unsigned | |
38 | ||
39 | static bfd_reloc_status_type mep_reloc (bfd *, arelent *, struct bfd_symbol *, | |
40 | void *, asection *, bfd *, char **); | |
41 | ||
42 | static reloc_howto_type mep_elf_howto_table [] = | |
43 | { | |
44 | /* type, size, bits, leftshift, rightshift, pcrel, OD/OS/OU, mask. */ | |
45 | MEPREL (R_MEP_NONE, 0, 0, 0, 0, 0, N, 0), | |
46 | MEPREL (R_RELC, 0, 0, 0, 0, 0, N, 0), | |
47 | /* MEPRELOC:HOWTO */ | |
48 | /* This section generated from bfd/mep-relocs.pl from include/elf/mep.h. */ | |
49 | MEPREL (R_MEP_8, 0, 8, 0, 0, 0, U, 0xff), | |
50 | MEPREL (R_MEP_16, 1, 16, 0, 0, 0, U, 0xffff), | |
51 | MEPREL (R_MEP_32, 2, 32, 0, 0, 0, U, 0xffffffff), | |
52 | MEPREL (R_MEP_PCREL8A2, 1, 8, 1, 1, 1, S, 0x00fe), | |
53 | MEPREL (R_MEP_PCREL12A2,1, 12, 1, 1, 1, S, 0x0ffe), | |
54 | MEPREL (R_MEP_PCREL17A2,2, 17, 0, 1, 1, S, 0x0000ffff), | |
55 | MEPREL (R_MEP_PCREL24A2,2, 24, 0, 1, 1, S, 0x07f0ffff), | |
56 | MEPREL (R_MEP_PCABS24A2,2, 24, 0, 1, 0, U, 0x07f0ffff), | |
57 | MEPREL (R_MEP_LOW16, 2, 16, 0, 0, 0, N, 0x0000ffff), | |
58 | MEPREL (R_MEP_HI16U, 2, 32, 0,16, 0, N, 0x0000ffff), | |
59 | MEPREL (R_MEP_HI16S, 2, 32, 0,16, 0, N, 0x0000ffff), | |
60 | MEPREL (R_MEP_GPREL, 2, 16, 0, 0, 0, S, 0x0000ffff), | |
61 | MEPREL (R_MEP_TPREL, 2, 16, 0, 0, 0, S, 0x0000ffff), | |
62 | MEPREL (R_MEP_TPREL7, 1, 7, 0, 0, 0, U, 0x007f), | |
63 | MEPREL (R_MEP_TPREL7A2, 1, 7, 1, 1, 0, U, 0x007e), | |
64 | MEPREL (R_MEP_TPREL7A4, 1, 7, 2, 2, 0, U, 0x007c), | |
65 | MEPREL (R_MEP_UIMM24, 2, 24, 0, 0, 0, U, 0x00ffffff), | |
66 | MEPREL (R_MEP_ADDR24A4, 2, 24, 0, 2, 0, U, 0x00fcffff), | |
67 | MEPREL (R_MEP_GNU_VTINHERIT,1, 0,16,32, 0, N, 0x0000), | |
68 | MEPREL (R_MEP_GNU_VTENTRY,1, 0,16,32, 0, N, 0x0000), | |
69 | /* MEPRELOC:END */ | |
70 | }; | |
71 | ||
72 | #define VALID_MEP_RELOC(N) ((N) >= 0 \ | |
73 | && (N) < ARRAY_SIZE (mep_elf_howto_table) | |
74 | ||
75 | #undef N | |
76 | #undef S | |
77 | #undef U | |
78 | ||
79 | static bfd_reloc_status_type | |
80 | mep_reloc | |
81 | (bfd * abfd ATTRIBUTE_UNUSED, | |
82 | arelent * reloc_entry ATTRIBUTE_UNUSED, | |
83 | struct bfd_symbol * symbol ATTRIBUTE_UNUSED, | |
84 | void * data ATTRIBUTE_UNUSED, | |
85 | asection * input_section ATTRIBUTE_UNUSED, | |
86 | bfd * output_bfd ATTRIBUTE_UNUSED, | |
87 | char ** error_message ATTRIBUTE_UNUSED) | |
88 | { | |
89 | return bfd_reloc_ok; | |
90 | } | |
91 | ||
92 | \f | |
93 | ||
94 | #define BFD_RELOC_MEP_NONE BFD_RELOC_NONE | |
95 | #if defined (__STDC__) || defined (ALMOST_STDC) || defined (HAVE_STRINGIZE) | |
96 | #define MAP(n) case BFD_RELOC_MEP_##n: type = R_MEP_##n; break | |
97 | #else | |
98 | #define MAP(n) case BFD_RELOC_MEP_/**/n: type = R_MEP_/**/n; break | |
99 | #endif | |
100 | ||
101 | static reloc_howto_type * | |
102 | mep_reloc_type_lookup | |
103 | (bfd * abfd ATTRIBUTE_UNUSED, | |
104 | bfd_reloc_code_real_type code) | |
105 | { | |
106 | unsigned int type = 0; | |
107 | ||
108 | switch (code) | |
109 | { | |
110 | MAP(NONE); | |
111 | case BFD_RELOC_8: | |
112 | type = R_MEP_8; | |
113 | break; | |
114 | case BFD_RELOC_16: | |
115 | type = R_MEP_16; | |
116 | break; | |
117 | case BFD_RELOC_32: | |
118 | type = R_MEP_32; | |
119 | break; | |
120 | case BFD_RELOC_VTABLE_ENTRY: | |
121 | type = R_MEP_GNU_VTENTRY; | |
122 | break; | |
123 | case BFD_RELOC_VTABLE_INHERIT: | |
124 | type = R_MEP_GNU_VTINHERIT; | |
125 | break; | |
126 | case BFD_RELOC_RELC: | |
127 | type = R_RELC; | |
128 | break; | |
129 | ||
130 | /* MEPRELOC:MAP */ | |
131 | /* This section generated from bfd/mep-relocs.pl from include/elf/mep.h. */ | |
132 | MAP(8); | |
133 | MAP(16); | |
134 | MAP(32); | |
135 | MAP(PCREL8A2); | |
136 | MAP(PCREL12A2); | |
137 | MAP(PCREL17A2); | |
138 | MAP(PCREL24A2); | |
139 | MAP(PCABS24A2); | |
140 | MAP(LOW16); | |
141 | MAP(HI16U); | |
142 | MAP(HI16S); | |
143 | MAP(GPREL); | |
144 | MAP(TPREL); | |
145 | MAP(TPREL7); | |
146 | MAP(TPREL7A2); | |
147 | MAP(TPREL7A4); | |
148 | MAP(UIMM24); | |
149 | MAP(ADDR24A4); | |
150 | MAP(GNU_VTINHERIT); | |
151 | MAP(GNU_VTENTRY); | |
152 | /* MEPRELOC:END */ | |
153 | ||
154 | default: | |
155 | /* Pacify gcc -Wall. */ | |
156 | fprintf (stderr, "mep: no reloc for code %d\n", code); | |
157 | return NULL; | |
158 | } | |
159 | ||
160 | if (mep_elf_howto_table[type].type != type) | |
161 | { | |
162 | fprintf (stderr, "MeP: howto %d has type %d\n", type, mep_elf_howto_table[type].type); | |
163 | abort (); | |
164 | } | |
165 | ||
166 | return mep_elf_howto_table + type; | |
167 | } | |
168 | ||
169 | #undef MAP | |
170 | ||
171 | \f | |
172 | /* Perform a single relocation. */ | |
173 | ||
174 | static struct bfd_link_info *mep_info; | |
175 | static int warn_tp = 0, warn_sda = 0; | |
176 | ||
177 | static bfd_vma | |
178 | mep_lookup_global | |
179 | (char * name, | |
180 | bfd_vma ofs, | |
181 | bfd_vma * cache, | |
182 | int * warn) | |
183 | { | |
184 | struct bfd_link_hash_entry *h; | |
185 | ||
186 | if (*cache || *warn) | |
187 | return *cache; | |
188 | ||
189 | h = bfd_link_hash_lookup (mep_info->hash, name, FALSE, FALSE, TRUE); | |
190 | if (h == 0 || h->type != bfd_link_hash_defined) | |
191 | { | |
192 | *warn = ofs + 1; | |
193 | return 0; | |
194 | } | |
195 | *cache = (h->u.def.value | |
196 | + h->u.def.section->output_section->vma | |
197 | + h->u.def.section->output_offset); | |
198 | return *cache; | |
199 | } | |
200 | ||
201 | static bfd_vma | |
202 | mep_tpoff_base (bfd_vma ofs) | |
203 | { | |
204 | static bfd_vma cache = 0; | |
205 | return mep_lookup_global ("__tpbase", ofs, &cache, &warn_tp); | |
206 | } | |
207 | ||
208 | static bfd_vma | |
209 | mep_sdaoff_base (bfd_vma ofs) | |
210 | { | |
211 | static bfd_vma cache = 0; | |
212 | return mep_lookup_global ("__sdabase", ofs, &cache, &warn_sda); | |
213 | } | |
214 | ||
215 | static bfd_reloc_status_type | |
216 | mep_final_link_relocate | |
217 | (reloc_howto_type * howto, | |
218 | bfd * input_bfd, | |
219 | asection * input_section, | |
220 | bfd_byte * contents, | |
221 | Elf_Internal_Rela * rel, | |
222 | bfd_vma relocation) | |
223 | { | |
224 | unsigned long u; | |
225 | long s; | |
226 | unsigned char *byte; | |
227 | bfd_vma pc; | |
228 | bfd_reloc_status_type r = bfd_reloc_ok; | |
229 | int e2, e4; | |
230 | ||
231 | if (bfd_big_endian (input_bfd)) | |
232 | { | |
233 | e2 = 0; | |
234 | e4 = 0; | |
235 | } | |
236 | else | |
237 | { | |
238 | e2 = 1; | |
239 | e4 = 3; | |
240 | } | |
241 | ||
242 | pc = (input_section->output_section->vma | |
243 | + input_section->output_offset | |
244 | + rel->r_offset); | |
245 | ||
246 | s = relocation + rel->r_addend; | |
247 | ||
248 | byte = (unsigned char *)contents + rel->r_offset; | |
249 | ||
250 | if (howto->type == R_MEP_PCREL24A2 | |
251 | && s == 0 | |
252 | && pc >= 0x800000) | |
253 | { | |
254 | /* This is an unreachable branch to an undefined weak function. | |
255 | Silently ignore it, since the opcode can't do that but should | |
256 | never be executed anyway. */ | |
257 | return bfd_reloc_ok; | |
258 | } | |
259 | ||
260 | if (howto->pc_relative) | |
261 | s -= pc; | |
262 | ||
263 | u = (unsigned long) s; | |
264 | ||
265 | switch (howto->type) | |
266 | { | |
267 | /* MEPRELOC:APPLY */ | |
268 | /* This section generated from bfd/mep-relocs.pl from include/elf/mep.h. */ | |
269 | case R_MEP_8: /* 76543210 */ | |
270 | if (u > 255) r = bfd_reloc_overflow; | |
271 | byte[0] = (u & 0xff); | |
272 | break; | |
273 | case R_MEP_16: /* fedcba9876543210 */ | |
274 | if (u > 65535) r = bfd_reloc_overflow; | |
275 | byte[0^e2] = ((u >> 8) & 0xff); | |
276 | byte[1^e2] = (u & 0xff); | |
277 | break; | |
278 | case R_MEP_32: /* vutsrqponmlkjihgfedcba9876543210 */ | |
279 | byte[0^e4] = ((u >> 24) & 0xff); | |
280 | byte[1^e4] = ((u >> 16) & 0xff); | |
281 | byte[2^e4] = ((u >> 8) & 0xff); | |
282 | byte[3^e4] = (u & 0xff); | |
283 | break; | |
284 | case R_MEP_PCREL8A2: /* --------7654321- */ | |
285 | if (-128 > s || s > 127) r = bfd_reloc_overflow; | |
286 | byte[1^e2] = (byte[1^e2] & 0x01) | (s & 0xfe); | |
287 | break; | |
288 | case R_MEP_PCREL12A2: /* ----ba987654321- */ | |
289 | if (-2048 > s || s > 2047) r = bfd_reloc_overflow; | |
290 | byte[0^e2] = (byte[0^e2] & 0xf0) | ((s >> 8) & 0x0f); | |
291 | byte[1^e2] = (byte[1^e2] & 0x01) | (s & 0xfe); | |
292 | break; | |
293 | case R_MEP_PCREL17A2: /* ----------------gfedcba987654321 */ | |
294 | if (-65536 > s || s > 65535) r = bfd_reloc_overflow; | |
295 | byte[2^e2] = ((s >> 9) & 0xff); | |
296 | byte[3^e2] = ((s >> 1) & 0xff); | |
297 | break; | |
298 | case R_MEP_PCREL24A2: /* -----7654321----nmlkjihgfedcba98 */ | |
299 | if (-8388608 > s || s > 8388607) r = bfd_reloc_overflow; | |
300 | byte[0^e2] = (byte[0^e2] & 0xf8) | ((s >> 5) & 0x07); | |
301 | byte[1^e2] = (byte[1^e2] & 0x0f) | ((s << 3) & 0xf0); | |
302 | byte[2^e2] = ((s >> 16) & 0xff); | |
303 | byte[3^e2] = ((s >> 8) & 0xff); | |
304 | break; | |
305 | case R_MEP_PCABS24A2: /* -----7654321----nmlkjihgfedcba98 */ | |
306 | if (u > 16777215) r = bfd_reloc_overflow; | |
307 | byte[0^e2] = (byte[0^e2] & 0xf8) | ((u >> 5) & 0x07); | |
308 | byte[1^e2] = (byte[1^e2] & 0x0f) | ((u << 3) & 0xf0); | |
309 | byte[2^e2] = ((u >> 16) & 0xff); | |
310 | byte[3^e2] = ((u >> 8) & 0xff); | |
311 | break; | |
312 | case R_MEP_LOW16: /* ----------------fedcba9876543210 */ | |
313 | byte[2^e2] = ((u >> 8) & 0xff); | |
314 | byte[3^e2] = (u & 0xff); | |
315 | break; | |
316 | case R_MEP_HI16U: /* ----------------vutsrqponmlkjihg */ | |
317 | byte[2^e2] = ((u >> 24) & 0xff); | |
318 | byte[3^e2] = ((u >> 16) & 0xff); | |
319 | break; | |
320 | case R_MEP_HI16S: /* ----------------vutsrqponmlkjihg */ | |
321 | byte[2^e2] = ((s >> 24) & 0xff); | |
322 | byte[3^e2] = ((s >> 16) & 0xff); | |
323 | break; | |
324 | case R_MEP_GPREL: /* ----------------fedcba9876543210 */ | |
325 | s -= mep_sdaoff_base(rel->r_offset); | |
326 | if (-32768 > s || s > 32767) r = bfd_reloc_overflow; | |
327 | byte[2^e2] = ((s >> 8) & 0xff); | |
328 | byte[3^e2] = (s & 0xff); | |
329 | break; | |
330 | case R_MEP_TPREL: /* ----------------fedcba9876543210 */ | |
331 | s -= mep_tpoff_base(rel->r_offset); | |
332 | if (-32768 > s || s > 32767) r = bfd_reloc_overflow; | |
333 | byte[2^e2] = ((s >> 8) & 0xff); | |
334 | byte[3^e2] = (s & 0xff); | |
335 | break; | |
336 | case R_MEP_TPREL7: /* ---------6543210 */ | |
337 | u -= mep_tpoff_base(rel->r_offset); | |
338 | if (u > 127) r = bfd_reloc_overflow; | |
339 | byte[1^e2] = (byte[1^e2] & 0x80) | (u & 0x7f); | |
340 | break; | |
341 | case R_MEP_TPREL7A2: /* ---------654321- */ | |
342 | u -= mep_tpoff_base(rel->r_offset); | |
343 | if (u > 127) r = bfd_reloc_overflow; | |
344 | byte[1^e2] = (byte[1^e2] & 0x81) | (u & 0x7e); | |
345 | break; | |
346 | case R_MEP_TPREL7A4: /* ---------65432-- */ | |
347 | u -= mep_tpoff_base(rel->r_offset); | |
348 | if (u > 127) r = bfd_reloc_overflow; | |
349 | byte[1^e2] = (byte[1^e2] & 0x83) | (u & 0x7c); | |
350 | break; | |
351 | case R_MEP_UIMM24: /* --------76543210nmlkjihgfedcba98 */ | |
352 | if (u > 16777215) r = bfd_reloc_overflow; | |
353 | byte[1^e2] = (u & 0xff); | |
354 | byte[2^e2] = ((u >> 16) & 0xff); | |
355 | byte[3^e2] = ((u >> 8) & 0xff); | |
356 | break; | |
357 | case R_MEP_ADDR24A4: /* --------765432--nmlkjihgfedcba98 */ | |
358 | if (u > 16777215) r = bfd_reloc_overflow; | |
359 | byte[1^e2] = (byte[1^e2] & 0x03) | (u & 0xfc); | |
360 | byte[2^e2] = ((u >> 16) & 0xff); | |
361 | byte[3^e2] = ((u >> 8) & 0xff); | |
362 | break; | |
363 | case R_MEP_GNU_VTINHERIT: /* ---------------- */ | |
364 | break; | |
365 | case R_MEP_GNU_VTENTRY: /* ---------------- */ | |
366 | break; | |
367 | /* MEPRELOC:END */ | |
368 | default: | |
369 | abort (); | |
370 | } | |
371 | ||
372 | return r; | |
373 | } | |
374 | \f | |
375 | /* Set the howto pointer for a MEP ELF reloc. */ | |
376 | ||
377 | static void | |
378 | mep_info_to_howto_rela | |
379 | (bfd * abfd ATTRIBUTE_UNUSED, | |
380 | arelent * cache_ptr, | |
381 | Elf_Internal_Rela * dst) | |
382 | { | |
383 | unsigned int r_type; | |
384 | ||
385 | r_type = ELF32_R_TYPE (dst->r_info); | |
386 | cache_ptr->howto = & mep_elf_howto_table [r_type]; | |
387 | } | |
388 | ||
389 | /* Look through the relocs for a section during the first phase. | |
390 | Since we don't do .gots or .plts, we just need to consider the | |
391 | virtual table relocs for gc. */ | |
392 | ||
393 | static bfd_boolean | |
394 | mep_elf_check_relocs | |
395 | (bfd * abfd, | |
396 | struct bfd_link_info * info, | |
397 | asection * sec, | |
398 | const Elf_Internal_Rela * relocs) | |
399 | { | |
400 | Elf_Internal_Shdr * symtab_hdr; | |
401 | struct elf_link_hash_entry ** sym_hashes; | |
402 | struct elf_link_hash_entry ** sym_hashes_end; | |
403 | const Elf_Internal_Rela * rel; | |
404 | const Elf_Internal_Rela * rel_end; | |
405 | ||
406 | if (info->relocatable) | |
407 | return TRUE; | |
408 | ||
409 | symtab_hdr = &elf_tdata (abfd)->symtab_hdr; | |
410 | sym_hashes = elf_sym_hashes (abfd); | |
411 | sym_hashes_end = sym_hashes + symtab_hdr->sh_size / sizeof (Elf32_External_Sym); | |
412 | if (!elf_bad_symtab (abfd)) | |
413 | sym_hashes_end -= symtab_hdr->sh_info; | |
414 | ||
415 | rel_end = relocs + sec->reloc_count; | |
416 | for (rel = relocs; rel < rel_end; rel++) | |
417 | { | |
418 | struct elf_link_hash_entry *h; | |
419 | unsigned long r_symndx; | |
420 | ||
421 | r_symndx = ELF32_R_SYM (rel->r_info); | |
422 | if (r_symndx < symtab_hdr->sh_info) | |
423 | h = NULL; | |
424 | else | |
425 | h = sym_hashes[r_symndx - symtab_hdr->sh_info]; | |
426 | } | |
427 | return TRUE; | |
428 | } | |
429 | ||
430 | \f | |
431 | /* Relocate a MEP ELF section. | |
432 | There is some attempt to make this function usable for many architectures, | |
433 | both USE_REL and USE_RELA ['twould be nice if such a critter existed], | |
434 | if only to serve as a learning tool. | |
435 | ||
436 | The RELOCATE_SECTION function is called by the new ELF backend linker | |
437 | to handle the relocations for a section. | |
438 | ||
439 | The relocs are always passed as Rela structures; if the section | |
440 | actually uses Rel structures, the r_addend field will always be | |
441 | zero. | |
442 | ||
443 | This function is responsible for adjusting the section contents as | |
444 | necessary, and (if using Rela relocs and generating a relocatable | |
445 | output file) adjusting the reloc addend as necessary. | |
446 | ||
447 | This function does not have to worry about setting the reloc | |
448 | address or the reloc symbol index. | |
449 | ||
450 | LOCAL_SYMS is a pointer to the swapped in local symbols. | |
451 | ||
452 | LOCAL_SECTIONS is an array giving the section in the input file | |
453 | corresponding to the st_shndx field of each local symbol. | |
454 | ||
455 | The global hash table entry for the global symbols can be found | |
456 | via elf_sym_hashes (input_bfd). | |
457 | ||
458 | When generating relocatable output, this function must handle | |
459 | STB_LOCAL/STT_SECTION symbols specially. The output symbol is | |
460 | going to be the section symbol corresponding to the output | |
461 | section, which means that the addend must be adjusted | |
462 | accordingly. */ | |
463 | ||
464 | static bfd_boolean | |
465 | mep_elf_relocate_section | |
466 | (bfd * output_bfd ATTRIBUTE_UNUSED, | |
467 | struct bfd_link_info * info, | |
468 | bfd * input_bfd, | |
469 | asection * input_section, | |
470 | bfd_byte * contents, | |
471 | Elf_Internal_Rela * relocs, | |
472 | Elf_Internal_Sym * local_syms, | |
473 | asection ** local_sections) | |
474 | { | |
475 | Elf_Internal_Shdr * symtab_hdr; | |
476 | struct elf_link_hash_entry ** sym_hashes; | |
477 | Elf_Internal_Rela * rel; | |
478 | Elf_Internal_Rela * relend; | |
479 | ||
480 | symtab_hdr = & elf_tdata (input_bfd)->symtab_hdr; | |
481 | sym_hashes = elf_sym_hashes (input_bfd); | |
482 | relend = relocs + input_section->reloc_count; | |
483 | ||
484 | mep_info = info; | |
485 | ||
486 | for (rel = relocs; rel < relend; rel ++) | |
487 | { | |
488 | reloc_howto_type * howto; | |
489 | unsigned long r_symndx; | |
490 | Elf_Internal_Sym * sym; | |
491 | asection * sec; | |
492 | struct elf_link_hash_entry * h; | |
493 | bfd_vma relocation; | |
494 | bfd_reloc_status_type r; | |
495 | const char * name = NULL; | |
496 | int r_type; | |
497 | ||
498 | r_type = ELF32_R_TYPE (rel->r_info); | |
499 | ||
500 | r_symndx = ELF32_R_SYM (rel->r_info); | |
501 | ||
502 | if (info->relocatable) | |
503 | { | |
504 | /* This is a relocatable link. We don't have to change | |
505 | anything, unless the reloc is against a section symbol, | |
506 | in which case we have to adjust according to where the | |
507 | section symbol winds up in the output section. */ | |
508 | if (r_symndx < symtab_hdr->sh_info) | |
509 | { | |
510 | sym = local_syms + r_symndx; | |
511 | ||
512 | if (ELF_ST_TYPE (sym->st_info) == STT_SECTION) | |
513 | { | |
514 | sec = local_sections [r_symndx]; | |
515 | rel->r_addend += sec->output_offset + sym->st_value; | |
516 | } | |
517 | } | |
518 | ||
519 | continue; | |
520 | } | |
521 | ||
522 | /* Is this a complex relocation? */ | |
523 | if (ELF32_R_TYPE (rel->r_info) == R_RELC) | |
524 | { | |
525 | bfd_elf_perform_complex_relocation (output_bfd, info, | |
526 | input_bfd, input_section, contents, | |
527 | rel, local_syms, local_sections); | |
528 | continue; | |
529 | } | |
530 | ||
531 | /* This is a final link. */ | |
532 | howto = mep_elf_howto_table + ELF32_R_TYPE (rel->r_info); | |
533 | h = NULL; | |
534 | sym = NULL; | |
535 | sec = NULL; | |
536 | ||
537 | if (r_symndx < symtab_hdr->sh_info) | |
538 | { | |
539 | sym = local_syms + r_symndx; | |
540 | sec = local_sections [r_symndx]; | |
541 | relocation = _bfd_elf_rela_local_sym (output_bfd, sym, &sec, rel); | |
542 | ||
543 | name = bfd_elf_string_from_elf_section | |
544 | (input_bfd, symtab_hdr->sh_link, sym->st_name); | |
545 | name = (name == NULL) ? bfd_section_name (input_bfd, sec) : name; | |
546 | #if 0 | |
547 | fprintf (stderr, "local: sec: %s, sym: %s (%d), value: %x + %x + %x addend %x\n", | |
548 | sec->name, name, sym->st_name, | |
549 | sec->output_section->vma, sec->output_offset, | |
550 | sym->st_value, rel->r_addend); | |
551 | #endif | |
552 | } | |
553 | else | |
554 | { | |
555 | h = sym_hashes [r_symndx]; | |
556 | ||
557 | while (h->root.type == bfd_link_hash_indirect | |
558 | || h->root.type == bfd_link_hash_warning) | |
559 | h = (struct elf_link_hash_entry *) h->root.u.i.link; | |
560 | ||
561 | name = h->root.root.string; | |
562 | ||
563 | if (h->root.type == bfd_link_hash_defined | |
564 | || h->root.type == bfd_link_hash_defweak) | |
565 | { | |
566 | sec = h->root.u.def.section; | |
567 | relocation = (h->root.u.def.value | |
568 | + sec->output_section->vma | |
569 | + sec->output_offset); | |
570 | #if 0 | |
571 | fprintf (stderr, | |
572 | "defined: sec: %s, name: %s, value: %x + %x + %x gives: %x\n", | |
573 | sec->name, name, h->root.u.def.value, | |
574 | sec->output_section->vma, sec->output_offset, relocation); | |
575 | #endif | |
576 | } | |
577 | else if (h->root.type == bfd_link_hash_undefweak) | |
578 | { | |
579 | #if 0 | |
580 | fprintf (stderr, "undefined: sec: %s, name: %s\n", | |
581 | sec->name, name); | |
582 | #endif | |
583 | relocation = 0; | |
584 | } | |
585 | else | |
586 | { | |
587 | if (! ((*info->callbacks->undefined_symbol) | |
588 | (info, h->root.root.string, input_bfd, | |
589 | input_section, rel->r_offset, | |
590 | (!info->shared && info->unresolved_syms_in_objects == RM_GENERATE_ERROR)))) | |
591 | return FALSE; | |
592 | #if 0 | |
593 | fprintf (stderr, "unknown: name: %s\n", name); | |
594 | #endif | |
595 | relocation = 0; | |
596 | } | |
597 | } | |
598 | ||
599 | switch (r_type) | |
600 | { | |
601 | default: | |
602 | r = mep_final_link_relocate (howto, input_bfd, input_section, | |
603 | contents, rel, relocation); | |
604 | break; | |
605 | } | |
606 | ||
607 | if (r != bfd_reloc_ok) | |
608 | { | |
609 | const char * msg = (const char *) NULL; | |
610 | ||
611 | switch (r) | |
612 | { | |
613 | case bfd_reloc_overflow: | |
614 | r = info->callbacks->reloc_overflow | |
615 | (info, (h ? &h->root : NULL), name, howto->name, (bfd_vma) 0, | |
616 | input_bfd, input_section, rel->r_offset); | |
617 | break; | |
618 | ||
619 | case bfd_reloc_undefined: | |
620 | r = info->callbacks->undefined_symbol | |
621 | (info, name, input_bfd, input_section, rel->r_offset, TRUE); | |
622 | break; | |
623 | ||
624 | case bfd_reloc_outofrange: | |
625 | msg = _("internal error: out of range error"); | |
626 | break; | |
627 | ||
628 | case bfd_reloc_notsupported: | |
629 | msg = _("internal error: unsupported relocation error"); | |
630 | break; | |
631 | ||
632 | case bfd_reloc_dangerous: | |
633 | msg = _("internal error: dangerous relocation"); | |
634 | break; | |
635 | ||
636 | default: | |
637 | msg = _("internal error: unknown error"); | |
638 | break; | |
639 | } | |
640 | ||
641 | if (msg) | |
642 | r = info->callbacks->warning | |
643 | (info, msg, name, input_bfd, input_section, rel->r_offset); | |
644 | ||
645 | if (! r) | |
646 | return FALSE; | |
647 | } | |
648 | } | |
649 | ||
650 | if (warn_tp) | |
651 | info->callbacks->undefined_symbol | |
652 | (info, "__tpbase", input_bfd, input_section, warn_tp-1, TRUE); | |
653 | if (warn_sda) | |
654 | info->callbacks->undefined_symbol | |
655 | (info, "__sdabase", input_bfd, input_section, warn_sda-1, TRUE); | |
656 | if (warn_sda || warn_tp) | |
657 | return FALSE; | |
658 | ||
659 | return TRUE; | |
660 | } | |
661 | \f | |
662 | ||
663 | /* Update the got entry reference counts for the section being | |
664 | removed. */ | |
665 | ||
666 | static bfd_boolean | |
667 | mep_elf_gc_sweep_hook | |
668 | (bfd * abfd ATTRIBUTE_UNUSED, | |
669 | struct bfd_link_info * info ATTRIBUTE_UNUSED, | |
670 | asection * sec ATTRIBUTE_UNUSED, | |
671 | const Elf_Internal_Rela * relocs ATTRIBUTE_UNUSED) | |
672 | { | |
673 | return TRUE; | |
674 | } | |
675 | ||
676 | /* Return the section that should be marked against GC for a given | |
677 | relocation. */ | |
678 | ||
679 | static asection * | |
680 | mep_elf_gc_mark_hook | |
681 | (asection * sec, | |
682 | struct bfd_link_info * info ATTRIBUTE_UNUSED, | |
683 | Elf_Internal_Rela * rel, | |
684 | struct elf_link_hash_entry * h, | |
685 | Elf_Internal_Sym * sym) | |
686 | { | |
687 | if (h != NULL) | |
688 | { | |
689 | switch (ELF32_R_TYPE (rel->r_info)) | |
690 | { | |
691 | default: | |
692 | switch (h->root.type) | |
693 | { | |
694 | case bfd_link_hash_defined: | |
695 | case bfd_link_hash_defweak: | |
696 | return h->root.u.def.section; | |
697 | ||
698 | case bfd_link_hash_common: | |
699 | return h->root.u.c.p->section; | |
700 | ||
701 | default: | |
702 | break; | |
703 | } | |
704 | } | |
705 | } | |
706 | else | |
707 | { | |
708 | if (!(elf_bad_symtab (sec->owner) | |
709 | && ELF_ST_BIND (sym->st_info) != STB_LOCAL) | |
710 | && ! ((sym->st_shndx <= 0 || sym->st_shndx >= SHN_LORESERVE) | |
711 | && sym->st_shndx != SHN_COMMON)) | |
712 | return bfd_section_from_elf_index (sec->owner, sym->st_shndx); | |
713 | } | |
714 | ||
715 | return NULL; | |
716 | } | |
717 | ||
718 | \f | |
719 | /* Function to set the ELF flag bits. */ | |
720 | ||
721 | static bfd_boolean | |
722 | mep_elf_set_private_flags (bfd * abfd, | |
723 | flagword flags) | |
724 | { | |
725 | elf_elfheader (abfd)->e_flags = flags; | |
726 | elf_flags_init (abfd) = TRUE; | |
727 | return TRUE; | |
728 | } | |
729 | ||
730 | static bfd_boolean | |
731 | mep_elf_copy_private_bfd_data (bfd * ibfd, bfd * obfd) | |
732 | { | |
733 | if (bfd_get_flavour (ibfd) != bfd_target_elf_flavour | |
734 | || bfd_get_flavour (obfd) != bfd_target_elf_flavour) | |
735 | return TRUE; | |
736 | ||
737 | elf_elfheader (obfd)->e_flags = elf_elfheader (ibfd)->e_flags; | |
738 | elf_flags_init (obfd) = TRUE; | |
739 | return TRUE; | |
740 | } | |
741 | ||
742 | /* Merge backend specific data from an object file to the output | |
743 | object file when linking. */ | |
744 | ||
745 | static bfd_boolean | |
746 | mep_elf_merge_private_bfd_data (bfd * ibfd, bfd * obfd) | |
747 | { | |
748 | static bfd *last_ibfd = 0; | |
749 | flagword old_flags, new_flags; | |
750 | flagword old_partial, new_partial; | |
751 | ||
752 | /* Check if we have the same endianess. */ | |
753 | if (_bfd_generic_verify_endian_match (ibfd, obfd) == FALSE) | |
754 | return FALSE; | |
755 | ||
756 | new_flags = elf_elfheader (ibfd)->e_flags; | |
757 | old_flags = elf_elfheader (obfd)->e_flags; | |
758 | ||
759 | #ifdef DEBUG | |
760 | _bfd_error_handler ("%B: old_flags = 0x%.8lx, new_flags = 0x%.8lx, init = %s", | |
761 | ibfd, old_flags, new_flags, elf_flags_init (obfd) ? "yes" : "no"); | |
762 | #endif | |
763 | ||
764 | /* First call, no flags set. */ | |
765 | if (!elf_flags_init (obfd)) | |
766 | { | |
767 | elf_flags_init (obfd) = TRUE; | |
768 | old_flags = new_flags; | |
769 | } | |
770 | else if ((new_flags | old_flags) & EF_MEP_LIBRARY) | |
771 | { | |
772 | /* Non-library flags trump library flags. The choice doesn't really | |
773 | matter if both OLD_FLAGS and NEW_FLAGS have EF_MEP_LIBRARY set. */ | |
774 | if (old_flags & EF_MEP_LIBRARY) | |
775 | old_flags = new_flags; | |
776 | } | |
777 | else | |
778 | { | |
779 | /* Make sure they're for the same mach. Allow upgrade from the "mep" | |
780 | mach. */ | |
781 | new_partial = (new_flags & EF_MEP_CPU_MASK); | |
782 | old_partial = (old_flags & EF_MEP_CPU_MASK); | |
783 | if (new_partial == old_partial) | |
784 | ; | |
785 | else if (new_partial == EF_MEP_CPU_MEP) | |
786 | ; | |
787 | else if (old_partial == EF_MEP_CPU_MEP) | |
788 | old_flags = (old_flags & ~EF_MEP_CPU_MASK) | new_partial; | |
789 | else | |
790 | { | |
791 | _bfd_error_handler (_("%B and %B are for different cores"), last_ibfd, ibfd); | |
792 | bfd_set_error (bfd_error_invalid_target); | |
793 | return FALSE; | |
794 | } | |
795 | ||
796 | /* Make sure they're for the same me_module. Allow basic config to | |
797 | mix with any other. */ | |
798 | new_partial = (new_flags & EF_MEP_INDEX_MASK); | |
799 | old_partial = (old_flags & EF_MEP_INDEX_MASK); | |
800 | if (new_partial == old_partial) | |
801 | ; | |
802 | else if (new_partial == 0) | |
803 | ; | |
804 | else if (old_partial == 0) | |
805 | old_flags = (old_flags & ~EF_MEP_INDEX_MASK) | new_partial; | |
806 | else | |
807 | { | |
808 | _bfd_error_handler (_("%B and %B are for different configurations"), last_ibfd, ibfd); | |
809 | bfd_set_error (bfd_error_invalid_target); | |
810 | return FALSE; | |
811 | } | |
812 | } | |
813 | ||
814 | elf_elfheader (obfd)->e_flags = old_flags; | |
815 | last_ibfd = ibfd; | |
816 | return TRUE; | |
817 | } | |
818 | ||
819 | /* This will be edited by the MeP configration tool. */ | |
820 | static const char * config_names[] = | |
821 | { | |
822 | "basic" | |
823 | /* start-mepcfgtool */ | |
824 | ,"simple" | |
825 | ,"fmax" | |
826 | /* end-mepcfgtool */ | |
827 | }; | |
828 | ||
829 | static const char * core_names[] = | |
830 | { | |
831 | "MeP", "MeP-c2", "MeP-c3", "MeP-h1" | |
832 | }; | |
833 | ||
834 | static bfd_boolean | |
835 | mep_elf_print_private_bfd_data (bfd * abfd, void * ptr) | |
836 | { | |
837 | FILE * file = (FILE *) ptr; | |
838 | flagword flags, partial_flags; | |
839 | ||
840 | BFD_ASSERT (abfd != NULL && ptr != NULL); | |
841 | ||
842 | /* Print normal ELF private data. */ | |
843 | _bfd_elf_print_private_bfd_data (abfd, ptr); | |
844 | ||
845 | flags = elf_elfheader (abfd)->e_flags; | |
846 | fprintf (file, _("private flags = 0x%lx"), (long)flags); | |
847 | ||
848 | partial_flags = (flags & EF_MEP_CPU_MASK) >> 24; | |
849 | if (partial_flags < ARRAY_SIZE (core_names)) | |
850 | fprintf (file, " core: %s", core_names[(long)partial_flags]); | |
851 | ||
852 | partial_flags = flags & EF_MEP_INDEX_MASK; | |
853 | if (partial_flags < ARRAY_SIZE (config_names)) | |
854 | fprintf (file, " me_module: %s", config_names[(long)partial_flags]); | |
855 | ||
856 | fputc ('\n', file); | |
857 | ||
858 | return TRUE; | |
859 | } | |
860 | ||
861 | /* Return the machine subcode from the ELF e_flags header. */ | |
862 | ||
863 | static int | |
864 | elf32_mep_machine (bfd * abfd) | |
865 | { | |
866 | switch (elf_elfheader (abfd)->e_flags & EF_MEP_CPU_MASK) | |
867 | { | |
868 | default: break; | |
869 | case EF_MEP_CPU_C2: return bfd_mach_mep; | |
870 | case EF_MEP_CPU_C3: return bfd_mach_mep; | |
871 | case EF_MEP_CPU_C4: return bfd_mach_mep; | |
872 | case EF_MEP_CPU_H1: return bfd_mach_mep_h1; | |
873 | } | |
874 | ||
875 | return bfd_mach_mep; | |
876 | } | |
877 | ||
878 | static bfd_boolean | |
879 | mep_elf_object_p (bfd * abfd) | |
880 | { | |
881 | /* Irix 5 and 6 is broken. Object file symbol tables are not always | |
882 | sorted correctly such that local symbols preceed global symbols, | |
883 | and the sh_info field in the symbol table is not always right. */ | |
884 | /* This is needed for the RELC support code. */ | |
885 | elf_bad_symtab (abfd) = TRUE; | |
886 | bfd_default_set_arch_mach (abfd, bfd_arch_mep, elf32_mep_machine (abfd)); | |
887 | return TRUE; | |
888 | } | |
889 | ||
890 | static bfd_boolean | |
891 | mep_elf_section_flags (flagword * flags, const Elf_Internal_Shdr * hdr) | |
892 | { | |
893 | if (hdr->sh_flags & SHF_MEP_VLIW) | |
894 | * flags |= SEC_MEP_VLIW; | |
895 | return TRUE; | |
896 | } | |
897 | ||
898 | static bfd_boolean | |
899 | mep_elf_fake_sections (bfd * abfd ATTRIBUTE_UNUSED, | |
900 | Elf_Internal_Shdr * hdr, | |
901 | asection * sec) | |
902 | { | |
903 | if (sec->flags & SEC_MEP_VLIW) | |
904 | hdr->sh_flags |= SHF_MEP_VLIW; | |
905 | return TRUE; | |
906 | } | |
907 | ||
908 | \f | |
909 | #define ELF_ARCH bfd_arch_mep | |
910 | #define ELF_MACHINE_CODE EM_CYGNUS_MEP | |
911 | #define ELF_MAXPAGESIZE 0x1000 | |
912 | ||
913 | #define TARGET_BIG_SYM bfd_elf32_mep_vec | |
914 | #define TARGET_BIG_NAME "elf32-mep" | |
915 | ||
916 | #define TARGET_LITTLE_SYM bfd_elf32_mep_little_vec | |
917 | #define TARGET_LITTLE_NAME "elf32-mep-little" | |
918 | ||
919 | #define elf_info_to_howto_rel NULL | |
920 | #define elf_info_to_howto mep_info_to_howto_rela | |
921 | #define elf_backend_relocate_section mep_elf_relocate_section | |
922 | #define elf_backend_gc_mark_hook mep_elf_gc_mark_hook | |
923 | #define elf_backend_gc_sweep_hook mep_elf_gc_sweep_hook | |
924 | #define elf_backend_check_relocs mep_elf_check_relocs | |
925 | #define elf_backend_object_p mep_elf_object_p | |
926 | #define elf_backend_section_flags mep_elf_section_flags | |
927 | #define elf_backend_fake_sections mep_elf_fake_sections | |
928 | ||
929 | #define elf_backend_can_gc_sections 1 | |
930 | ||
931 | #define bfd_elf32_bfd_reloc_type_lookup mep_reloc_type_lookup | |
932 | #define bfd_elf32_bfd_set_private_flags mep_elf_set_private_flags | |
933 | #define bfd_elf32_bfd_copy_private_bfd_data mep_elf_copy_private_bfd_data | |
934 | #define bfd_elf32_bfd_merge_private_bfd_data mep_elf_merge_private_bfd_data | |
935 | #define bfd_elf32_bfd_print_private_bfd_data mep_elf_print_private_bfd_data | |
936 | ||
937 | /* We use only the RELA entries. */ | |
938 | #define USE_RELA | |
939 | ||
940 | #include "elf32-target.h" |