1 /* 32-bit ELF support for ARM old abi option.
2 Copyright 1999, 2000, 2001, 2002 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 #define OLD_ARM_ABI
21 #define bfd_elf32_arm_allocate_interworking_sections \
22 bfd_elf32_arm_oabi_allocate_interworking_sections
23 #define bfd_elf32_arm_get_bfd_for_interworking \
24 bfd_elf32_arm_oabi_get_bfd_for_interworking
25 #define bfd_elf32_arm_process_before_allocation \
26 bfd_elf32_arm_oabi_process_before_allocation
27 #define bfd_elf32_arm_add_glue_sections_to_bfd \
28 bfd_elf32_arm_oabi_add_glue_sections_to_bfd
29
30 #include "elf/arm.h"
31 #include "bfd.h"
32 #include "sysdep.h"
33 #include "libbfd.h"
34 #include "elf-bfd.h"
35
36 #ifndef NUM_ELEM
37 #define NUM_ELEM(a) (sizeof (a) / sizeof (a)[0])
38 #endif
39
40 #define TARGET_LITTLE_SYM bfd_elf32_littlearm_oabi_vec
41 #define TARGET_LITTLE_NAME "elf32-littlearm-oabi"
42 #define TARGET_BIG_SYM bfd_elf32_bigarm_oabi_vec
43 #define TARGET_BIG_NAME "elf32-bigarm-oabi"
44
45 #define elf_info_to_howto elf32_arm_info_to_howto
46 #define elf_info_to_howto_rel 0
47
48 #define ARM_ELF_ABI_VERSION 0
49 #define ARM_ELF_OS_ABI_VERSION 0
50
51 static reloc_howto_type * find_howto PARAMS ((unsigned int));
52 static void elf32_arm_info_to_howto PARAMS ((bfd *, arelent *, Elf_Internal_Rela *));
53 static reloc_howto_type * elf32_arm_reloc_type_lookup PARAMS ((bfd *, bfd_reloc_code_real_type));
54
55 static reloc_howto_type elf32_arm_howto_table[] =
56 {
57 /* No relocation. */
58 HOWTO (R_ARM_NONE, /* type */
59 0, /* rightshift */
60 0, /* size (0 = byte, 1 = short, 2 = long) */
61 0, /* bitsize */
62 FALSE, /* pc_relative */
63 0, /* bitpos */
64 complain_overflow_dont, /* complain_on_overflow */
65 bfd_elf_generic_reloc, /* special_function */
66 "R_ARM_NONE", /* name */
67 FALSE, /* partial_inplace */
68 0, /* src_mask */
69 0, /* dst_mask */
70 FALSE), /* pcrel_offset */
71
72 HOWTO (R_ARM_PC24, /* type */
73 2, /* rightshift */
74 2, /* size (0 = byte, 1 = short, 2 = long) */
75 24, /* bitsize */
76 TRUE, /* pc_relative */
77 0, /* bitpos */
78 complain_overflow_signed, /* complain_on_overflow */
79 bfd_elf_generic_reloc, /* special_function */
80 "R_ARM_PC24", /* name */
81 FALSE, /* partial_inplace */
82 0x00ffffff, /* src_mask */
83 0x00ffffff, /* dst_mask */
84 TRUE), /* pcrel_offset */
85
86 /* 32 bit absolute. */
87 HOWTO (R_ARM_ABS32, /* type */
88 0, /* rightshift */
89 2, /* size (0 = byte, 1 = short, 2 = long) */
90 32, /* bitsize */
91 FALSE, /* pc_relative */
92 0, /* bitpos */
93 complain_overflow_bitfield, /* complain_on_overflow */
94 bfd_elf_generic_reloc, /* special_function */
95 "R_ARM_ABS32", /* name */
96 FALSE, /* partial_inplace */
97 0xffffffff, /* src_mask */
98 0xffffffff, /* dst_mask */
99 FALSE), /* pcrel_offset */
100
101 /* Standard 32bit pc-relative reloc. */
102 HOWTO (R_ARM_REL32, /* type */
103 0, /* rightshift */
104 2, /* size (0 = byte, 1 = short, 2 = long) */
105 32, /* bitsize */
106 TRUE, /* pc_relative */
107 0, /* bitpos */
108 complain_overflow_bitfield, /* complain_on_overflow */
109 bfd_elf_generic_reloc, /* special_function */
110 "R_ARM_REL32", /* name */
111 FALSE, /* partial_inplace */
112 0xffffffff, /* src_mask */
113 0xffffffff, /* dst_mask */
114 TRUE), /* pcrel_offset */
115
116 /* 8 bit absolute. */
117 HOWTO (R_ARM_ABS8, /* type */
118 0, /* rightshift */
119 0, /* size (0 = byte, 1 = short, 2 = long) */
120 8, /* bitsize */
121 FALSE, /* pc_relative */
122 0, /* bitpos */
123 complain_overflow_bitfield, /* complain_on_overflow */
124 bfd_elf_generic_reloc, /* special_function */
125 "R_ARM_ABS8", /* name */
126 FALSE, /* partial_inplace */
127 0x000000ff, /* src_mask */
128 0x000000ff, /* dst_mask */
129 FALSE), /* pcrel_offset */
130
131 /* 16 bit absolute. */
132 HOWTO (R_ARM_ABS16, /* type */
133 0, /* rightshift */
134 1, /* size (0 = byte, 1 = short, 2 = long) */
135 16, /* bitsize */
136 FALSE, /* pc_relative */
137 0, /* bitpos */
138 complain_overflow_bitfield, /* complain_on_overflow */
139 bfd_elf_generic_reloc, /* special_function */
140 "R_ARM_ABS16", /* name */
141 FALSE, /* partial_inplace */
142 0, /* src_mask */
143 0, /* dst_mask */
144 FALSE), /* pcrel_offset */
145
146 /* 12 bit absolute. */
147 HOWTO (R_ARM_ABS12, /* type */
148 0, /* rightshift */
149 2, /* size (0 = byte, 1 = short, 2 = long) */
150 12, /* bitsize */
151 FALSE, /* pc_relative */
152 0, /* bitpos */
153 complain_overflow_bitfield, /* complain_on_overflow */
154 bfd_elf_generic_reloc, /* special_function */
155 "R_ARM_ABS12", /* name */
156 FALSE, /* partial_inplace */
157 0x000008ff, /* src_mask */
158 0x000008ff, /* dst_mask */
159 FALSE), /* pcrel_offset */
160
161 HOWTO (R_ARM_THM_ABS5, /* type */
162 6, /* rightshift */
163 1, /* size (0 = byte, 1 = short, 2 = long) */
164 5, /* bitsize */
165 FALSE, /* pc_relative */
166 0, /* bitpos */
167 complain_overflow_bitfield, /* complain_on_overflow */
168 bfd_elf_generic_reloc, /* special_function */
169 "R_ARM_THM_ABS5", /* name */
170 FALSE, /* partial_inplace */
171 0x000007e0, /* src_mask */
172 0x000007e0, /* dst_mask */
173 FALSE), /* pcrel_offset */
174
175 HOWTO (R_ARM_THM_PC22, /* type */
176 1, /* rightshift */
177 2, /* size (0 = byte, 1 = short, 2 = long) */
178 23, /* bitsize */
179 TRUE, /* pc_relative */
180 0, /* bitpos */
181 complain_overflow_signed, /* complain_on_overflow */
182 bfd_elf_generic_reloc, /* special_function */
183 "R_ARM_THM_PC22", /* name */
184 FALSE, /* partial_inplace */
185 0x07ff07ff, /* src_mask */
186 0x07ff07ff, /* dst_mask */
187 TRUE), /* pcrel_offset */
188
189 HOWTO (R_ARM_SBREL32, /* type */
190 0, /* rightshift */
191 0, /* size (0 = byte, 1 = short, 2 = long) */
192 0, /* bitsize */
193 FALSE, /* pc_relative */
194 0, /* bitpos */
195 complain_overflow_dont,/* complain_on_overflow */
196 bfd_elf_generic_reloc, /* special_function */
197 "R_ARM_SBREL32", /* name */
198 FALSE, /* partial_inplace */
199 0, /* src_mask */
200 0, /* dst_mask */
201 FALSE), /* pcrel_offset */
202
203 HOWTO (R_ARM_AMP_VCALL9, /* type */
204 1, /* rightshift */
205 1, /* size (0 = byte, 1 = short, 2 = long) */
206 8, /* bitsize */
207 TRUE, /* pc_relative */
208 0, /* bitpos */
209 complain_overflow_signed, /* complain_on_overflow */
210 bfd_elf_generic_reloc, /* special_function */
211 "R_ARM_AMP_VCALL9", /* name */
212 FALSE, /* partial_inplace */
213 0x000000ff, /* src_mask */
214 0x000000ff, /* dst_mask */
215 TRUE), /* pcrel_offset */
216
217 /* 12 bit pc relative. */
218 HOWTO (R_ARM_THM_PC11, /* type */
219 1, /* rightshift */
220 1, /* size (0 = byte, 1 = short, 2 = long) */
221 11, /* bitsize */
222 TRUE, /* pc_relative */
223 0, /* bitpos */
224 complain_overflow_signed, /* complain_on_overflow */
225 bfd_elf_generic_reloc, /* special_function */
226 "R_ARM_THM_PC11", /* name */
227 FALSE, /* partial_inplace */
228 0x000007ff, /* src_mask */
229 0x000007ff, /* dst_mask */
230 TRUE), /* pcrel_offset */
231
232 /* 12 bit pc relative. */
233 HOWTO (R_ARM_THM_PC9, /* type */
234 1, /* rightshift */
235 1, /* size (0 = byte, 1 = short, 2 = long) */
236 8, /* bitsize */
237 TRUE, /* pc_relative */
238 0, /* bitpos */
239 complain_overflow_signed, /* complain_on_overflow */
240 bfd_elf_generic_reloc, /* special_function */
241 "R_ARM_THM_PC9", /* name */
242 FALSE, /* partial_inplace */
243 0x000000ff, /* src_mask */
244 0x000000ff, /* dst_mask */
245 TRUE), /* pcrel_offset */
246
247 /* GNU extension to record C++ vtable hierarchy. */
248 HOWTO (R_ARM_GNU_VTINHERIT, /* type */
249 0, /* rightshift */
250 2, /* size (0 = byte, 1 = short, 2 = long) */
251 0, /* bitsize */
252 FALSE, /* pc_relative */
253 0, /* bitpos */
254 complain_overflow_dont, /* complain_on_overflow */
255 NULL, /* special_function */
256 "R_ARM_GNU_VTINHERIT", /* name */
257 FALSE, /* partial_inplace */
258 0, /* src_mask */
259 0, /* dst_mask */
260 FALSE), /* pcrel_offset */
261
262 /* GNU extension to record C++ vtable member usage. */
263 HOWTO (R_ARM_GNU_VTENTRY, /* type */
264 0, /* rightshift */
265 2, /* size (0 = byte, 1 = short, 2 = long) */
266 0, /* bitsize */
267 FALSE, /* pc_relative */
268 0, /* bitpos */
269 complain_overflow_dont, /* complain_on_overflow */
270 _bfd_elf_rel_vtable_reloc_fn, /* special_function */
271 "R_ARM_GNU_VTENTRY", /* name */
272 FALSE, /* partial_inplace */
273 0, /* src_mask */
274 0, /* dst_mask */
275 FALSE), /* pcrel_offset */
276
277 /* XXX - gap in index numbering here. */
278
279 HOWTO (R_ARM_PLT32, /* type */
280 2, /* rightshift */
281 2, /* size (0 = byte, 1 = short, 2 = long) */
282 26, /* bitsize */
283 TRUE, /* pc_relative */
284 0, /* bitpos */
285 complain_overflow_bitfield,/* complain_on_overflow */
286 bfd_elf_generic_reloc, /* special_function */
287 "R_ARM_PLT32", /* name */
288 TRUE, /* partial_inplace */
289 0x00ffffff, /* src_mask */
290 0x00ffffff, /* dst_mask */
291 TRUE), /* pcrel_offset */
292
293 /* XXX - gap in index numbering here. */
294
295 HOWTO (R_ARM_RREL32, /* type */
296 0, /* rightshift */
297 0, /* size (0 = byte, 1 = short, 2 = long) */
298 0, /* bitsize */
299 FALSE, /* pc_relative */
300 0, /* bitpos */
301 complain_overflow_dont, /* complain_on_overflow */
302 bfd_elf_generic_reloc, /* special_function */
303 "R_ARM_RREL32", /* name */
304 FALSE, /* partial_inplace */
305 0, /* src_mask */
306 0, /* dst_mask */
307 FALSE), /* pcrel_offset */
308
309 HOWTO (R_ARM_RABS32, /* type */
310 0, /* rightshift */
311 0, /* size (0 = byte, 1 = short, 2 = long) */
312 0, /* bitsize */
313 FALSE, /* pc_relative */
314 0, /* bitpos */
315 complain_overflow_dont, /* complain_on_overflow */
316 bfd_elf_generic_reloc, /* special_function */
317 "R_ARM_RABS32", /* name */
318 FALSE, /* partial_inplace */
319 0, /* src_mask */
320 0, /* dst_mask */
321 FALSE), /* pcrel_offset */
322
323 HOWTO (R_ARM_RPC24, /* type */
324 0, /* rightshift */
325 0, /* size (0 = byte, 1 = short, 2 = long) */
326 0, /* bitsize */
327 FALSE, /* pc_relative */
328 0, /* bitpos */
329 complain_overflow_dont, /* complain_on_overflow */
330 bfd_elf_generic_reloc, /* special_function */
331 "R_ARM_RPC24", /* name */
332 FALSE, /* partial_inplace */
333 0, /* src_mask */
334 0, /* dst_mask */
335 FALSE), /* pcrel_offset */
336
337 HOWTO (R_ARM_RBASE, /* type */
338 0, /* rightshift */
339 0, /* size (0 = byte, 1 = short, 2 = long) */
340 0, /* bitsize */
341 FALSE, /* pc_relative */
342 0, /* bitpos */
343 complain_overflow_dont, /* complain_on_overflow */
344 bfd_elf_generic_reloc, /* special_function */
345 "R_ARM_RBASE", /* name */
346 FALSE, /* partial_inplace */
347 0, /* src_mask */
348 0, /* dst_mask */
349 FALSE) /* pcrel_offset */
350 };
351
352 /* Locate a reloc in the howto table. This function must be used
353 when the entry number is is > R_ARM_GNU_VTINHERIT. */
354
355 static reloc_howto_type *
find_howto(r_type)356 find_howto (r_type)
357 unsigned int r_type;
358 {
359 int i;
360
361 for (i = NUM_ELEM (elf32_arm_howto_table); i--;)
362 if (elf32_arm_howto_table [i].type == r_type)
363 return elf32_arm_howto_table + i;
364
365 return NULL;
366 }
367
368 static void
elf32_arm_info_to_howto(abfd,bfd_reloc,elf_reloc)369 elf32_arm_info_to_howto (abfd, bfd_reloc, elf_reloc)
370 bfd *abfd ATTRIBUTE_UNUSED;
371 arelent *bfd_reloc;
372 Elf_Internal_Rela *elf_reloc;
373 {
374 unsigned int r_type;
375
376 r_type = ELF32_R_TYPE (elf_reloc->r_info);
377
378 if (r_type <= R_ARM_GNU_VTINHERIT)
379 bfd_reloc->howto = & elf32_arm_howto_table[r_type];
380 else
381 bfd_reloc->howto = find_howto (r_type);
382 }
383
384 struct elf32_arm_reloc_map
385 {
386 bfd_reloc_code_real_type bfd_reloc_val;
387 unsigned char elf_reloc_val;
388 };
389
390 static const struct elf32_arm_reloc_map elf32_arm_reloc_map[] =
391 {
392 {BFD_RELOC_NONE, R_ARM_NONE },
393 {BFD_RELOC_ARM_PCREL_BRANCH, R_ARM_PC24 },
394 {BFD_RELOC_32, R_ARM_ABS32 },
395 {BFD_RELOC_32_PCREL, R_ARM_REL32 },
396 {BFD_RELOC_8, R_ARM_ABS8 },
397 {BFD_RELOC_16, R_ARM_ABS16 },
398 {BFD_RELOC_ARM_OFFSET_IMM, R_ARM_ABS12 },
399 {BFD_RELOC_ARM_THUMB_OFFSET, R_ARM_THM_ABS5 },
400 {BFD_RELOC_THUMB_PCREL_BRANCH23, R_ARM_THM_PC22 },
401 {BFD_RELOC_NONE, R_ARM_SBREL32 },
402 {BFD_RELOC_NONE, R_ARM_AMP_VCALL9 },
403 {BFD_RELOC_THUMB_PCREL_BRANCH12, R_ARM_THM_PC11 },
404 {BFD_RELOC_THUMB_PCREL_BRANCH9, R_ARM_THM_PC9 },
405 {BFD_RELOC_VTABLE_INHERIT, R_ARM_GNU_VTINHERIT },
406 {BFD_RELOC_VTABLE_ENTRY, R_ARM_GNU_VTENTRY }
407 };
408
409 static reloc_howto_type *
elf32_arm_reloc_type_lookup(abfd,code)410 elf32_arm_reloc_type_lookup (abfd, code)
411 bfd * abfd ATTRIBUTE_UNUSED;
412 bfd_reloc_code_real_type code;
413 {
414 unsigned int i;
415
416 for (i = NUM_ELEM (elf32_arm_reloc_map); i--;)
417 if (elf32_arm_reloc_map[i].bfd_reloc_val == code)
418 return & elf32_arm_howto_table [elf32_arm_reloc_map[i].elf_reloc_val];
419
420 if (code == BFD_RELOC_ARM_PLT32)
421 return find_howto (R_ARM_PLT32);
422
423 return NULL;
424 }
425
426 #include "elf32-arm.h"
427