Commit | Line | Data |
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adde6300 | 1 | /* AVR-specific support for 32-bit ELF |
4b95cf5c | 2 | Copyright (C) 1999-2014 Free Software Foundation, Inc. |
adde6300 AM |
3 | Contributed by Denis Chertykov <denisc@overta.ru> |
4 | ||
750bce0e | 5 | This file is part of BFD, the Binary File Descriptor library. |
adde6300 | 6 | |
750bce0e NC |
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 | |
cd123cb7 | 9 | the Free Software Foundation; either version 3 of the License, or |
750bce0e | 10 | (at your option) any later version. |
adde6300 | 11 | |
750bce0e NC |
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. | |
adde6300 | 16 | |
750bce0e NC |
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 | |
4cdc7696 | 19 | Foundation, Inc., 51 Franklin Street - Fifth Floor, |
df406460 | 20 | Boston, MA 02110-1301, USA. */ |
adde6300 | 21 | |
adde6300 | 22 | #include "sysdep.h" |
3db64b00 | 23 | #include "bfd.h" |
adde6300 AM |
24 | #include "libbfd.h" |
25 | #include "elf-bfd.h" | |
26 | #include "elf/avr.h" | |
28c9d252 NC |
27 | #include "elf32-avr.h" |
28 | ||
29 | /* Enable debugging printout at stdout with this variable. */ | |
30 | static bfd_boolean debug_relax = FALSE; | |
31 | ||
32 | /* Enable debugging printout at stdout with this variable. */ | |
33 | static bfd_boolean debug_stubs = FALSE; | |
34 | ||
e4ef1b6c | 35 | static bfd_reloc_status_type |
f36e8886 BS |
36 | bfd_elf_avr_diff_reloc (bfd *, arelent *, asymbol *, void *, |
37 | asection *, bfd *, char **); | |
e4ef1b6c | 38 | |
28c9d252 NC |
39 | /* Hash table initialization and handling. Code is taken from the hppa port |
40 | and adapted to the needs of AVR. */ | |
41 | ||
42 | /* We use two hash tables to hold information for linking avr objects. | |
43 | ||
4dfe6ac6 | 44 | The first is the elf32_avr_link_hash_table which is derived from the |
28c9d252 NC |
45 | stanard ELF linker hash table. We use this as a place to attach the other |
46 | hash table and some static information. | |
47 | ||
48 | The second is the stub hash table which is derived from the base BFD | |
49 | hash table. The stub hash table holds the information on the linker | |
50 | stubs. */ | |
51 | ||
52 | struct elf32_avr_stub_hash_entry | |
53 | { | |
54 | /* Base hash table entry structure. */ | |
55 | struct bfd_hash_entry bh_root; | |
56 | ||
57 | /* Offset within stub_sec of the beginning of this stub. */ | |
58 | bfd_vma stub_offset; | |
59 | ||
60 | /* Given the symbol's value and its section we can determine its final | |
61 | value when building the stubs (so the stub knows where to jump). */ | |
62 | bfd_vma target_value; | |
63 | ||
64 | /* This way we could mark stubs to be no longer necessary. */ | |
65 | bfd_boolean is_actually_needed; | |
66 | }; | |
67 | ||
68 | struct elf32_avr_link_hash_table | |
69 | { | |
70 | /* The main hash table. */ | |
71 | struct elf_link_hash_table etab; | |
72 | ||
73 | /* The stub hash table. */ | |
74 | struct bfd_hash_table bstab; | |
75 | ||
76 | bfd_boolean no_stubs; | |
77 | ||
78 | /* Linker stub bfd. */ | |
79 | bfd *stub_bfd; | |
80 | ||
81 | /* The stub section. */ | |
82 | asection *stub_sec; | |
83 | ||
84 | /* Usually 0, unless we are generating code for a bootloader. Will | |
85 | be initialized by elf32_avr_size_stubs to the vma offset of the | |
86 | output section associated with the stub section. */ | |
87 | bfd_vma vector_base; | |
88 | ||
89 | /* Assorted information used by elf32_avr_size_stubs. */ | |
90 | unsigned int bfd_count; | |
91 | int top_index; | |
92 | asection ** input_list; | |
93 | Elf_Internal_Sym ** all_local_syms; | |
94 | ||
95 | /* Tables for mapping vma beyond the 128k boundary to the address of the | |
96 | corresponding stub. (AMT) | |
97 | "amt_max_entry_cnt" reflects the number of entries that memory is allocated | |
98 | for in the "amt_stub_offsets" and "amt_destination_addr" arrays. | |
99 | "amt_entry_cnt" informs how many of these entries actually contain | |
100 | useful data. */ | |
101 | unsigned int amt_entry_cnt; | |
102 | unsigned int amt_max_entry_cnt; | |
103 | bfd_vma * amt_stub_offsets; | |
104 | bfd_vma * amt_destination_addr; | |
105 | }; | |
106 | ||
107 | /* Various hash macros and functions. */ | |
108 | #define avr_link_hash_table(p) \ | |
64ee10b6 | 109 | /* PR 3874: Check that we have an AVR style hash table before using it. */\ |
4dfe6ac6 NC |
110 | (elf_hash_table_id ((struct elf_link_hash_table *) ((p)->hash)) \ |
111 | == AVR_ELF_DATA ? ((struct elf32_avr_link_hash_table *) ((p)->hash)) : NULL) | |
28c9d252 NC |
112 | |
113 | #define avr_stub_hash_entry(ent) \ | |
114 | ((struct elf32_avr_stub_hash_entry *)(ent)) | |
115 | ||
116 | #define avr_stub_hash_lookup(table, string, create, copy) \ | |
117 | ((struct elf32_avr_stub_hash_entry *) \ | |
118 | bfd_hash_lookup ((table), (string), (create), (copy))) | |
adde6300 | 119 | |
adde6300 AM |
120 | static reloc_howto_type elf_avr_howto_table[] = |
121 | { | |
122 | HOWTO (R_AVR_NONE, /* type */ | |
123 | 0, /* rightshift */ | |
124 | 2, /* size (0 = byte, 1 = short, 2 = long) */ | |
125 | 32, /* bitsize */ | |
b34976b6 | 126 | FALSE, /* pc_relative */ |
adde6300 AM |
127 | 0, /* bitpos */ |
128 | complain_overflow_bitfield, /* complain_on_overflow */ | |
129 | bfd_elf_generic_reloc, /* special_function */ | |
130 | "R_AVR_NONE", /* name */ | |
b34976b6 | 131 | FALSE, /* partial_inplace */ |
adde6300 AM |
132 | 0, /* src_mask */ |
133 | 0, /* dst_mask */ | |
b34976b6 | 134 | FALSE), /* pcrel_offset */ |
adde6300 AM |
135 | |
136 | HOWTO (R_AVR_32, /* type */ | |
137 | 0, /* rightshift */ | |
138 | 2, /* size (0 = byte, 1 = short, 2 = long) */ | |
139 | 32, /* bitsize */ | |
b34976b6 | 140 | FALSE, /* pc_relative */ |
adde6300 AM |
141 | 0, /* bitpos */ |
142 | complain_overflow_bitfield, /* complain_on_overflow */ | |
143 | bfd_elf_generic_reloc, /* special_function */ | |
144 | "R_AVR_32", /* name */ | |
b34976b6 | 145 | FALSE, /* partial_inplace */ |
adde6300 AM |
146 | 0xffffffff, /* src_mask */ |
147 | 0xffffffff, /* dst_mask */ | |
b34976b6 | 148 | FALSE), /* pcrel_offset */ |
adde6300 AM |
149 | |
150 | /* A 7 bit PC relative relocation. */ | |
151 | HOWTO (R_AVR_7_PCREL, /* type */ | |
152 | 1, /* rightshift */ | |
153 | 1, /* size (0 = byte, 1 = short, 2 = long) */ | |
154 | 7, /* bitsize */ | |
b34976b6 | 155 | TRUE, /* pc_relative */ |
adde6300 AM |
156 | 3, /* bitpos */ |
157 | complain_overflow_bitfield, /* complain_on_overflow */ | |
158 | bfd_elf_generic_reloc, /* special_function */ | |
159 | "R_AVR_7_PCREL", /* name */ | |
b34976b6 | 160 | FALSE, /* partial_inplace */ |
adde6300 AM |
161 | 0xffff, /* src_mask */ |
162 | 0xffff, /* dst_mask */ | |
b34976b6 | 163 | TRUE), /* pcrel_offset */ |
adde6300 AM |
164 | |
165 | /* A 13 bit PC relative relocation. */ | |
166 | HOWTO (R_AVR_13_PCREL, /* type */ | |
167 | 1, /* rightshift */ | |
168 | 1, /* size (0 = byte, 1 = short, 2 = long) */ | |
169 | 13, /* bitsize */ | |
b34976b6 | 170 | TRUE, /* pc_relative */ |
adde6300 AM |
171 | 0, /* bitpos */ |
172 | complain_overflow_bitfield, /* complain_on_overflow */ | |
173 | bfd_elf_generic_reloc, /* special_function */ | |
174 | "R_AVR_13_PCREL", /* name */ | |
b34976b6 | 175 | FALSE, /* partial_inplace */ |
adde6300 AM |
176 | 0xfff, /* src_mask */ |
177 | 0xfff, /* dst_mask */ | |
b34976b6 | 178 | TRUE), /* pcrel_offset */ |
adde6300 AM |
179 | |
180 | /* A 16 bit absolute relocation. */ | |
181 | HOWTO (R_AVR_16, /* type */ | |
182 | 0, /* rightshift */ | |
183 | 1, /* size (0 = byte, 1 = short, 2 = long) */ | |
184 | 16, /* bitsize */ | |
b34976b6 | 185 | FALSE, /* pc_relative */ |
adde6300 AM |
186 | 0, /* bitpos */ |
187 | complain_overflow_dont, /* complain_on_overflow */ | |
188 | bfd_elf_generic_reloc, /* special_function */ | |
189 | "R_AVR_16", /* name */ | |
b34976b6 | 190 | FALSE, /* partial_inplace */ |
adde6300 AM |
191 | 0xffff, /* src_mask */ |
192 | 0xffff, /* dst_mask */ | |
b34976b6 | 193 | FALSE), /* pcrel_offset */ |
adde6300 | 194 | |
28c9d252 NC |
195 | /* A 16 bit absolute relocation for command address |
196 | Will be changed when linker stubs are needed. */ | |
adde6300 AM |
197 | HOWTO (R_AVR_16_PM, /* type */ |
198 | 1, /* rightshift */ | |
199 | 1, /* size (0 = byte, 1 = short, 2 = long) */ | |
200 | 16, /* bitsize */ | |
b34976b6 | 201 | FALSE, /* pc_relative */ |
adde6300 AM |
202 | 0, /* bitpos */ |
203 | complain_overflow_bitfield, /* complain_on_overflow */ | |
204 | bfd_elf_generic_reloc, /* special_function */ | |
205 | "R_AVR_16_PM", /* name */ | |
b34976b6 | 206 | FALSE, /* partial_inplace */ |
adde6300 AM |
207 | 0xffff, /* src_mask */ |
208 | 0xffff, /* dst_mask */ | |
b34976b6 | 209 | FALSE), /* pcrel_offset */ |
adde6300 AM |
210 | /* A low 8 bit absolute relocation of 16 bit address. |
211 | For LDI command. */ | |
212 | HOWTO (R_AVR_LO8_LDI, /* type */ | |
213 | 0, /* rightshift */ | |
214 | 1, /* size (0 = byte, 1 = short, 2 = long) */ | |
215 | 8, /* bitsize */ | |
b34976b6 | 216 | FALSE, /* pc_relative */ |
adde6300 AM |
217 | 0, /* bitpos */ |
218 | complain_overflow_dont, /* complain_on_overflow */ | |
219 | bfd_elf_generic_reloc, /* special_function */ | |
220 | "R_AVR_LO8_LDI", /* name */ | |
b34976b6 | 221 | FALSE, /* partial_inplace */ |
adde6300 AM |
222 | 0xffff, /* src_mask */ |
223 | 0xffff, /* dst_mask */ | |
b34976b6 | 224 | FALSE), /* pcrel_offset */ |
adde6300 AM |
225 | /* A high 8 bit absolute relocation of 16 bit address. |
226 | For LDI command. */ | |
227 | HOWTO (R_AVR_HI8_LDI, /* type */ | |
228 | 8, /* rightshift */ | |
229 | 1, /* size (0 = byte, 1 = short, 2 = long) */ | |
230 | 8, /* bitsize */ | |
b34976b6 | 231 | FALSE, /* pc_relative */ |
adde6300 AM |
232 | 0, /* bitpos */ |
233 | complain_overflow_dont, /* complain_on_overflow */ | |
234 | bfd_elf_generic_reloc, /* special_function */ | |
235 | "R_AVR_HI8_LDI", /* name */ | |
b34976b6 | 236 | FALSE, /* partial_inplace */ |
adde6300 AM |
237 | 0xffff, /* src_mask */ |
238 | 0xffff, /* dst_mask */ | |
b34976b6 | 239 | FALSE), /* pcrel_offset */ |
adde6300 | 240 | /* A high 6 bit absolute relocation of 22 bit address. |
4cdc7696 | 241 | For LDI command. As well second most significant 8 bit value of |
df406460 | 242 | a 32 bit link-time constant. */ |
adde6300 AM |
243 | HOWTO (R_AVR_HH8_LDI, /* type */ |
244 | 16, /* rightshift */ | |
245 | 1, /* size (0 = byte, 1 = short, 2 = long) */ | |
246 | 8, /* bitsize */ | |
b34976b6 | 247 | FALSE, /* pc_relative */ |
adde6300 AM |
248 | 0, /* bitpos */ |
249 | complain_overflow_dont, /* complain_on_overflow */ | |
250 | bfd_elf_generic_reloc, /* special_function */ | |
251 | "R_AVR_HH8_LDI", /* name */ | |
b34976b6 | 252 | FALSE, /* partial_inplace */ |
adde6300 AM |
253 | 0xffff, /* src_mask */ |
254 | 0xffff, /* dst_mask */ | |
b34976b6 | 255 | FALSE), /* pcrel_offset */ |
adde6300 AM |
256 | /* A negative low 8 bit absolute relocation of 16 bit address. |
257 | For LDI command. */ | |
258 | HOWTO (R_AVR_LO8_LDI_NEG, /* type */ | |
259 | 0, /* rightshift */ | |
260 | 1, /* size (0 = byte, 1 = short, 2 = long) */ | |
261 | 8, /* bitsize */ | |
b34976b6 | 262 | FALSE, /* pc_relative */ |
adde6300 AM |
263 | 0, /* bitpos */ |
264 | complain_overflow_dont, /* complain_on_overflow */ | |
265 | bfd_elf_generic_reloc, /* special_function */ | |
266 | "R_AVR_LO8_LDI_NEG", /* name */ | |
b34976b6 | 267 | FALSE, /* partial_inplace */ |
adde6300 AM |
268 | 0xffff, /* src_mask */ |
269 | 0xffff, /* dst_mask */ | |
b34976b6 | 270 | FALSE), /* pcrel_offset */ |
df406460 | 271 | /* A negative high 8 bit absolute relocation of 16 bit address. |
adde6300 AM |
272 | For LDI command. */ |
273 | HOWTO (R_AVR_HI8_LDI_NEG, /* type */ | |
274 | 8, /* rightshift */ | |
275 | 1, /* size (0 = byte, 1 = short, 2 = long) */ | |
276 | 8, /* bitsize */ | |
b34976b6 | 277 | FALSE, /* pc_relative */ |
adde6300 AM |
278 | 0, /* bitpos */ |
279 | complain_overflow_dont, /* complain_on_overflow */ | |
280 | bfd_elf_generic_reloc, /* special_function */ | |
281 | "R_AVR_HI8_LDI_NEG", /* name */ | |
b34976b6 | 282 | FALSE, /* partial_inplace */ |
adde6300 AM |
283 | 0xffff, /* src_mask */ |
284 | 0xffff, /* dst_mask */ | |
b34976b6 | 285 | FALSE), /* pcrel_offset */ |
df406460 | 286 | /* A negative high 6 bit absolute relocation of 22 bit address. |
adde6300 AM |
287 | For LDI command. */ |
288 | HOWTO (R_AVR_HH8_LDI_NEG, /* type */ | |
289 | 16, /* rightshift */ | |
290 | 1, /* size (0 = byte, 1 = short, 2 = long) */ | |
291 | 8, /* bitsize */ | |
b34976b6 | 292 | FALSE, /* pc_relative */ |
adde6300 AM |
293 | 0, /* bitpos */ |
294 | complain_overflow_dont, /* complain_on_overflow */ | |
295 | bfd_elf_generic_reloc, /* special_function */ | |
296 | "R_AVR_HH8_LDI_NEG", /* name */ | |
b34976b6 | 297 | FALSE, /* partial_inplace */ |
adde6300 AM |
298 | 0xffff, /* src_mask */ |
299 | 0xffff, /* dst_mask */ | |
b34976b6 | 300 | FALSE), /* pcrel_offset */ |
adde6300 | 301 | /* A low 8 bit absolute relocation of 24 bit program memory address. |
28c9d252 | 302 | For LDI command. Will not be changed when linker stubs are needed. */ |
adde6300 AM |
303 | HOWTO (R_AVR_LO8_LDI_PM, /* type */ |
304 | 1, /* rightshift */ | |
305 | 1, /* size (0 = byte, 1 = short, 2 = long) */ | |
306 | 8, /* bitsize */ | |
b34976b6 | 307 | FALSE, /* pc_relative */ |
adde6300 AM |
308 | 0, /* bitpos */ |
309 | complain_overflow_dont, /* complain_on_overflow */ | |
310 | bfd_elf_generic_reloc, /* special_function */ | |
311 | "R_AVR_LO8_LDI_PM", /* name */ | |
b34976b6 | 312 | FALSE, /* partial_inplace */ |
adde6300 AM |
313 | 0xffff, /* src_mask */ |
314 | 0xffff, /* dst_mask */ | |
b34976b6 | 315 | FALSE), /* pcrel_offset */ |
28c9d252 NC |
316 | /* A low 8 bit absolute relocation of 24 bit program memory address. |
317 | For LDI command. Will not be changed when linker stubs are needed. */ | |
adde6300 AM |
318 | HOWTO (R_AVR_HI8_LDI_PM, /* type */ |
319 | 9, /* rightshift */ | |
320 | 1, /* size (0 = byte, 1 = short, 2 = long) */ | |
321 | 8, /* bitsize */ | |
b34976b6 | 322 | FALSE, /* pc_relative */ |
adde6300 AM |
323 | 0, /* bitpos */ |
324 | complain_overflow_dont, /* complain_on_overflow */ | |
325 | bfd_elf_generic_reloc, /* special_function */ | |
326 | "R_AVR_HI8_LDI_PM", /* name */ | |
b34976b6 | 327 | FALSE, /* partial_inplace */ |
adde6300 AM |
328 | 0xffff, /* src_mask */ |
329 | 0xffff, /* dst_mask */ | |
b34976b6 | 330 | FALSE), /* pcrel_offset */ |
28c9d252 NC |
331 | /* A low 8 bit absolute relocation of 24 bit program memory address. |
332 | For LDI command. Will not be changed when linker stubs are needed. */ | |
adde6300 AM |
333 | HOWTO (R_AVR_HH8_LDI_PM, /* type */ |
334 | 17, /* rightshift */ | |
335 | 1, /* size (0 = byte, 1 = short, 2 = long) */ | |
336 | 8, /* bitsize */ | |
b34976b6 | 337 | FALSE, /* pc_relative */ |
adde6300 AM |
338 | 0, /* bitpos */ |
339 | complain_overflow_dont, /* complain_on_overflow */ | |
340 | bfd_elf_generic_reloc, /* special_function */ | |
341 | "R_AVR_HH8_LDI_PM", /* name */ | |
b34976b6 | 342 | FALSE, /* partial_inplace */ |
adde6300 AM |
343 | 0xffff, /* src_mask */ |
344 | 0xffff, /* dst_mask */ | |
b34976b6 | 345 | FALSE), /* pcrel_offset */ |
28c9d252 NC |
346 | /* A low 8 bit absolute relocation of 24 bit program memory address. |
347 | For LDI command. Will not be changed when linker stubs are needed. */ | |
adde6300 AM |
348 | HOWTO (R_AVR_LO8_LDI_PM_NEG, /* type */ |
349 | 1, /* rightshift */ | |
350 | 1, /* size (0 = byte, 1 = short, 2 = long) */ | |
351 | 8, /* bitsize */ | |
b34976b6 | 352 | FALSE, /* pc_relative */ |
adde6300 AM |
353 | 0, /* bitpos */ |
354 | complain_overflow_dont, /* complain_on_overflow */ | |
355 | bfd_elf_generic_reloc, /* special_function */ | |
356 | "R_AVR_LO8_LDI_PM_NEG", /* name */ | |
b34976b6 | 357 | FALSE, /* partial_inplace */ |
adde6300 AM |
358 | 0xffff, /* src_mask */ |
359 | 0xffff, /* dst_mask */ | |
b34976b6 | 360 | FALSE), /* pcrel_offset */ |
28c9d252 NC |
361 | /* A low 8 bit absolute relocation of 24 bit program memory address. |
362 | For LDI command. Will not be changed when linker stubs are needed. */ | |
adde6300 AM |
363 | HOWTO (R_AVR_HI8_LDI_PM_NEG, /* type */ |
364 | 9, /* rightshift */ | |
365 | 1, /* size (0 = byte, 1 = short, 2 = long) */ | |
366 | 8, /* bitsize */ | |
b34976b6 | 367 | FALSE, /* pc_relative */ |
adde6300 AM |
368 | 0, /* bitpos */ |
369 | complain_overflow_dont, /* complain_on_overflow */ | |
370 | bfd_elf_generic_reloc, /* special_function */ | |
371 | "R_AVR_HI8_LDI_PM_NEG", /* name */ | |
b34976b6 | 372 | FALSE, /* partial_inplace */ |
adde6300 AM |
373 | 0xffff, /* src_mask */ |
374 | 0xffff, /* dst_mask */ | |
b34976b6 | 375 | FALSE), /* pcrel_offset */ |
28c9d252 NC |
376 | /* A low 8 bit absolute relocation of 24 bit program memory address. |
377 | For LDI command. Will not be changed when linker stubs are needed. */ | |
adde6300 AM |
378 | HOWTO (R_AVR_HH8_LDI_PM_NEG, /* type */ |
379 | 17, /* rightshift */ | |
380 | 1, /* size (0 = byte, 1 = short, 2 = long) */ | |
381 | 8, /* bitsize */ | |
b34976b6 | 382 | FALSE, /* pc_relative */ |
adde6300 AM |
383 | 0, /* bitpos */ |
384 | complain_overflow_dont, /* complain_on_overflow */ | |
385 | bfd_elf_generic_reloc, /* special_function */ | |
386 | "R_AVR_HH8_LDI_PM_NEG", /* name */ | |
b34976b6 | 387 | FALSE, /* partial_inplace */ |
adde6300 AM |
388 | 0xffff, /* src_mask */ |
389 | 0xffff, /* dst_mask */ | |
b34976b6 | 390 | FALSE), /* pcrel_offset */ |
adde6300 AM |
391 | /* Relocation for CALL command in ATmega. */ |
392 | HOWTO (R_AVR_CALL, /* type */ | |
393 | 1, /* rightshift */ | |
394 | 2, /* size (0 = byte, 1 = short, 2 = long) */ | |
395 | 23, /* bitsize */ | |
b34976b6 | 396 | FALSE, /* pc_relative */ |
adde6300 | 397 | 0, /* bitpos */ |
750bce0e | 398 | complain_overflow_dont,/* complain_on_overflow */ |
adde6300 AM |
399 | bfd_elf_generic_reloc, /* special_function */ |
400 | "R_AVR_CALL", /* name */ | |
b34976b6 | 401 | FALSE, /* partial_inplace */ |
adde6300 AM |
402 | 0xffffffff, /* src_mask */ |
403 | 0xffffffff, /* dst_mask */ | |
750bce0e NC |
404 | FALSE), /* pcrel_offset */ |
405 | /* A 16 bit absolute relocation of 16 bit address. | |
406 | For LDI command. */ | |
407 | HOWTO (R_AVR_LDI, /* type */ | |
408 | 0, /* rightshift */ | |
409 | 1, /* size (0 = byte, 1 = short, 2 = long) */ | |
410 | 16, /* bitsize */ | |
411 | FALSE, /* pc_relative */ | |
412 | 0, /* bitpos */ | |
413 | complain_overflow_dont,/* complain_on_overflow */ | |
414 | bfd_elf_generic_reloc, /* special_function */ | |
415 | "R_AVR_LDI", /* name */ | |
416 | FALSE, /* partial_inplace */ | |
417 | 0xffff, /* src_mask */ | |
418 | 0xffff, /* dst_mask */ | |
419 | FALSE), /* pcrel_offset */ | |
420 | /* A 6 bit absolute relocation of 6 bit offset. | |
421 | For ldd/sdd command. */ | |
422 | HOWTO (R_AVR_6, /* type */ | |
423 | 0, /* rightshift */ | |
424 | 0, /* size (0 = byte, 1 = short, 2 = long) */ | |
425 | 6, /* bitsize */ | |
426 | FALSE, /* pc_relative */ | |
427 | 0, /* bitpos */ | |
428 | complain_overflow_dont,/* complain_on_overflow */ | |
429 | bfd_elf_generic_reloc, /* special_function */ | |
430 | "R_AVR_6", /* name */ | |
431 | FALSE, /* partial_inplace */ | |
432 | 0xffff, /* src_mask */ | |
433 | 0xffff, /* dst_mask */ | |
434 | FALSE), /* pcrel_offset */ | |
435 | /* A 6 bit absolute relocation of 6 bit offset. | |
436 | For sbiw/adiw command. */ | |
437 | HOWTO (R_AVR_6_ADIW, /* type */ | |
438 | 0, /* rightshift */ | |
439 | 0, /* size (0 = byte, 1 = short, 2 = long) */ | |
440 | 6, /* bitsize */ | |
441 | FALSE, /* pc_relative */ | |
442 | 0, /* bitpos */ | |
443 | complain_overflow_dont,/* complain_on_overflow */ | |
444 | bfd_elf_generic_reloc, /* special_function */ | |
445 | "R_AVR_6_ADIW", /* name */ | |
446 | FALSE, /* partial_inplace */ | |
447 | 0xffff, /* src_mask */ | |
448 | 0xffff, /* dst_mask */ | |
df406460 NC |
449 | FALSE), /* pcrel_offset */ |
450 | /* Most significant 8 bit value of a 32 bit link-time constant. */ | |
451 | HOWTO (R_AVR_MS8_LDI, /* type */ | |
452 | 24, /* rightshift */ | |
453 | 1, /* size (0 = byte, 1 = short, 2 = long) */ | |
454 | 8, /* bitsize */ | |
455 | FALSE, /* pc_relative */ | |
456 | 0, /* bitpos */ | |
457 | complain_overflow_dont, /* complain_on_overflow */ | |
458 | bfd_elf_generic_reloc, /* special_function */ | |
459 | "R_AVR_MS8_LDI", /* name */ | |
460 | FALSE, /* partial_inplace */ | |
461 | 0xffff, /* src_mask */ | |
462 | 0xffff, /* dst_mask */ | |
463 | FALSE), /* pcrel_offset */ | |
464 | /* Negative most significant 8 bit value of a 32 bit link-time constant. */ | |
465 | HOWTO (R_AVR_MS8_LDI_NEG, /* type */ | |
466 | 24, /* rightshift */ | |
467 | 1, /* size (0 = byte, 1 = short, 2 = long) */ | |
468 | 8, /* bitsize */ | |
469 | FALSE, /* pc_relative */ | |
470 | 0, /* bitpos */ | |
471 | complain_overflow_dont, /* complain_on_overflow */ | |
472 | bfd_elf_generic_reloc, /* special_function */ | |
473 | "R_AVR_MS8_LDI_NEG", /* name */ | |
474 | FALSE, /* partial_inplace */ | |
475 | 0xffff, /* src_mask */ | |
476 | 0xffff, /* dst_mask */ | |
28c9d252 NC |
477 | FALSE), /* pcrel_offset */ |
478 | /* A low 8 bit absolute relocation of 24 bit program memory address. | |
17e57237 | 479 | For LDI command. Will be changed when linker stubs are needed. */ |
28c9d252 NC |
480 | HOWTO (R_AVR_LO8_LDI_GS, /* type */ |
481 | 1, /* rightshift */ | |
482 | 1, /* size (0 = byte, 1 = short, 2 = long) */ | |
483 | 8, /* bitsize */ | |
484 | FALSE, /* pc_relative */ | |
485 | 0, /* bitpos */ | |
486 | complain_overflow_dont, /* complain_on_overflow */ | |
487 | bfd_elf_generic_reloc, /* special_function */ | |
488 | "R_AVR_LO8_LDI_GS", /* name */ | |
489 | FALSE, /* partial_inplace */ | |
490 | 0xffff, /* src_mask */ | |
491 | 0xffff, /* dst_mask */ | |
492 | FALSE), /* pcrel_offset */ | |
493 | /* A low 8 bit absolute relocation of 24 bit program memory address. | |
17e57237 | 494 | For LDI command. Will be changed when linker stubs are needed. */ |
28c9d252 NC |
495 | HOWTO (R_AVR_HI8_LDI_GS, /* type */ |
496 | 9, /* rightshift */ | |
497 | 1, /* size (0 = byte, 1 = short, 2 = long) */ | |
498 | 8, /* bitsize */ | |
499 | FALSE, /* pc_relative */ | |
500 | 0, /* bitpos */ | |
501 | complain_overflow_dont, /* complain_on_overflow */ | |
502 | bfd_elf_generic_reloc, /* special_function */ | |
503 | "R_AVR_HI8_LDI_GS", /* name */ | |
504 | FALSE, /* partial_inplace */ | |
505 | 0xffff, /* src_mask */ | |
506 | 0xffff, /* dst_mask */ | |
17e57237 NC |
507 | FALSE), /* pcrel_offset */ |
508 | /* 8 bit offset. */ | |
509 | HOWTO (R_AVR_8, /* type */ | |
510 | 0, /* rightshift */ | |
511 | 0, /* size (0 = byte, 1 = short, 2 = long) */ | |
512 | 8, /* bitsize */ | |
513 | FALSE, /* pc_relative */ | |
514 | 0, /* bitpos */ | |
515 | complain_overflow_bitfield,/* complain_on_overflow */ | |
516 | bfd_elf_generic_reloc, /* special_function */ | |
517 | "R_AVR_8", /* name */ | |
518 | FALSE, /* partial_inplace */ | |
519 | 0x000000ff, /* src_mask */ | |
520 | 0x000000ff, /* dst_mask */ | |
521 | FALSE), /* pcrel_offset */ | |
99700d6f NC |
522 | /* lo8-part to use in .byte lo8(sym). */ |
523 | HOWTO (R_AVR_8_LO8, /* type */ | |
524 | 0, /* rightshift */ | |
525 | 0, /* size (0 = byte, 1 = short, 2 = long) */ | |
526 | 8, /* bitsize */ | |
527 | FALSE, /* pc_relative */ | |
528 | 0, /* bitpos */ | |
529 | complain_overflow_dont,/* complain_on_overflow */ | |
530 | bfd_elf_generic_reloc, /* special_function */ | |
531 | "R_AVR_8_LO8", /* name */ | |
532 | FALSE, /* partial_inplace */ | |
533 | 0xffffff, /* src_mask */ | |
534 | 0xffffff, /* dst_mask */ | |
535 | FALSE), /* pcrel_offset */ | |
536 | /* hi8-part to use in .byte hi8(sym). */ | |
537 | HOWTO (R_AVR_8_HI8, /* type */ | |
538 | 8, /* rightshift */ | |
539 | 0, /* size (0 = byte, 1 = short, 2 = long) */ | |
540 | 8, /* bitsize */ | |
541 | FALSE, /* pc_relative */ | |
542 | 0, /* bitpos */ | |
543 | complain_overflow_dont,/* complain_on_overflow */ | |
544 | bfd_elf_generic_reloc, /* special_function */ | |
545 | "R_AVR_8_HI8", /* name */ | |
546 | FALSE, /* partial_inplace */ | |
547 | 0xffffff, /* src_mask */ | |
548 | 0xffffff, /* dst_mask */ | |
549 | FALSE), /* pcrel_offset */ | |
40551fb8 NC |
550 | /* hlo8-part to use in .byte hlo8(sym). */ |
551 | HOWTO (R_AVR_8_HLO8, /* type */ | |
99700d6f NC |
552 | 16, /* rightshift */ |
553 | 0, /* size (0 = byte, 1 = short, 2 = long) */ | |
554 | 8, /* bitsize */ | |
555 | FALSE, /* pc_relative */ | |
556 | 0, /* bitpos */ | |
557 | complain_overflow_dont,/* complain_on_overflow */ | |
558 | bfd_elf_generic_reloc, /* special_function */ | |
40551fb8 | 559 | "R_AVR_8_HLO8", /* name */ |
99700d6f NC |
560 | FALSE, /* partial_inplace */ |
561 | 0xffffff, /* src_mask */ | |
562 | 0xffffff, /* dst_mask */ | |
563 | FALSE), /* pcrel_offset */ | |
f36e8886 BS |
564 | HOWTO (R_AVR_DIFF8, /* type */ |
565 | 0, /* rightshift */ | |
566 | 0, /* size (0 = byte, 1 = short, 2 = long) */ | |
567 | 8, /* bitsize */ | |
568 | FALSE, /* pc_relative */ | |
569 | 0, /* bitpos */ | |
570 | complain_overflow_bitfield, /* complain_on_overflow */ | |
571 | bfd_elf_avr_diff_reloc, /* special_function */ | |
572 | "R_AVR_DIFF8", /* name */ | |
573 | FALSE, /* partial_inplace */ | |
574 | 0, /* src_mask */ | |
575 | 0xff, /* dst_mask */ | |
576 | FALSE), /* pcrel_offset */ | |
577 | HOWTO (R_AVR_DIFF16, /* type */ | |
578 | 0, /* rightshift */ | |
579 | 1, /* size (0 = byte, 1 = short, 2 = long) */ | |
580 | 16, /* bitsize */ | |
581 | FALSE, /* pc_relative */ | |
582 | 0, /* bitpos */ | |
583 | complain_overflow_bitfield, /* complain_on_overflow */ | |
584 | bfd_elf_avr_diff_reloc,/* special_function */ | |
585 | "R_AVR_DIFF16", /* name */ | |
586 | FALSE, /* partial_inplace */ | |
587 | 0, /* src_mask */ | |
588 | 0xffff, /* dst_mask */ | |
589 | FALSE), /* pcrel_offset */ | |
590 | HOWTO (R_AVR_DIFF32, /* type */ | |
591 | 0, /* rightshift */ | |
592 | 2, /* size (0 = byte, 1 = short, 2 = long) */ | |
593 | 32, /* bitsize */ | |
594 | FALSE, /* pc_relative */ | |
595 | 0, /* bitpos */ | |
596 | complain_overflow_bitfield, /* complain_on_overflow */ | |
597 | bfd_elf_avr_diff_reloc,/* special_function */ | |
598 | "R_AVR_DIFF32", /* name */ | |
599 | FALSE, /* partial_inplace */ | |
600 | 0, /* src_mask */ | |
601 | 0xffffffff, /* dst_mask */ | |
602 | FALSE), /* pcrel_offset */ | |
603 | /* 7 bit immediate for LDS/STS in Tiny core. */ | |
604 | HOWTO (R_AVR_LDS_STS_16, /* type */ | |
605 | 0, /* rightshift */ | |
606 | 1, /* size (0 = byte, 1 = short, 2 = long) */ | |
607 | 7, /* bitsize */ | |
608 | FALSE, /* pc_relative */ | |
609 | 0, /* bitpos */ | |
610 | complain_overflow_dont,/* complain_on_overflow */ | |
611 | bfd_elf_generic_reloc, /* special_function */ | |
612 | "R_AVR_LDS_STS_16", /* name */ | |
613 | FALSE, /* partial_inplace */ | |
614 | 0xffff, /* src_mask */ | |
615 | 0xffff, /* dst_mask */ | |
616 | FALSE) /* pcrel_offset */ | |
adde6300 AM |
617 | }; |
618 | ||
619 | /* Map BFD reloc types to AVR ELF reloc types. */ | |
620 | ||
621 | struct avr_reloc_map | |
622 | { | |
623 | bfd_reloc_code_real_type bfd_reloc_val; | |
624 | unsigned int elf_reloc_val; | |
625 | }; | |
626 | ||
28c9d252 | 627 | static const struct avr_reloc_map avr_reloc_map[] = |
adde6300 AM |
628 | { |
629 | { BFD_RELOC_NONE, R_AVR_NONE }, | |
630 | { BFD_RELOC_32, R_AVR_32 }, | |
631 | { BFD_RELOC_AVR_7_PCREL, R_AVR_7_PCREL }, | |
632 | { BFD_RELOC_AVR_13_PCREL, R_AVR_13_PCREL }, | |
633 | { BFD_RELOC_16, R_AVR_16 }, | |
634 | { BFD_RELOC_AVR_16_PM, R_AVR_16_PM }, | |
635 | { BFD_RELOC_AVR_LO8_LDI, R_AVR_LO8_LDI}, | |
636 | { BFD_RELOC_AVR_HI8_LDI, R_AVR_HI8_LDI }, | |
637 | { BFD_RELOC_AVR_HH8_LDI, R_AVR_HH8_LDI }, | |
df406460 | 638 | { BFD_RELOC_AVR_MS8_LDI, R_AVR_MS8_LDI }, |
adde6300 AM |
639 | { BFD_RELOC_AVR_LO8_LDI_NEG, R_AVR_LO8_LDI_NEG }, |
640 | { BFD_RELOC_AVR_HI8_LDI_NEG, R_AVR_HI8_LDI_NEG }, | |
641 | { BFD_RELOC_AVR_HH8_LDI_NEG, R_AVR_HH8_LDI_NEG }, | |
df406460 | 642 | { BFD_RELOC_AVR_MS8_LDI_NEG, R_AVR_MS8_LDI_NEG }, |
adde6300 | 643 | { BFD_RELOC_AVR_LO8_LDI_PM, R_AVR_LO8_LDI_PM }, |
28c9d252 | 644 | { BFD_RELOC_AVR_LO8_LDI_GS, R_AVR_LO8_LDI_GS }, |
adde6300 | 645 | { BFD_RELOC_AVR_HI8_LDI_PM, R_AVR_HI8_LDI_PM }, |
28c9d252 | 646 | { BFD_RELOC_AVR_HI8_LDI_GS, R_AVR_HI8_LDI_GS }, |
adde6300 AM |
647 | { BFD_RELOC_AVR_HH8_LDI_PM, R_AVR_HH8_LDI_PM }, |
648 | { BFD_RELOC_AVR_LO8_LDI_PM_NEG, R_AVR_LO8_LDI_PM_NEG }, | |
649 | { BFD_RELOC_AVR_HI8_LDI_PM_NEG, R_AVR_HI8_LDI_PM_NEG }, | |
650 | { BFD_RELOC_AVR_HH8_LDI_PM_NEG, R_AVR_HH8_LDI_PM_NEG }, | |
750bce0e NC |
651 | { BFD_RELOC_AVR_CALL, R_AVR_CALL }, |
652 | { BFD_RELOC_AVR_LDI, R_AVR_LDI }, | |
653 | { BFD_RELOC_AVR_6, R_AVR_6 }, | |
17e57237 | 654 | { BFD_RELOC_AVR_6_ADIW, R_AVR_6_ADIW }, |
99700d6f NC |
655 | { BFD_RELOC_8, R_AVR_8 }, |
656 | { BFD_RELOC_AVR_8_LO, R_AVR_8_LO8 }, | |
657 | { BFD_RELOC_AVR_8_HI, R_AVR_8_HI8 }, | |
e4ef1b6c DC |
658 | { BFD_RELOC_AVR_8_HLO, R_AVR_8_HLO8 }, |
659 | { BFD_RELOC_AVR_DIFF8, R_AVR_DIFF8 }, | |
660 | { BFD_RELOC_AVR_DIFF16, R_AVR_DIFF16 }, | |
f36e8886 BS |
661 | { BFD_RELOC_AVR_DIFF32, R_AVR_DIFF32 }, |
662 | { BFD_RELOC_AVR_LDS_STS_16, R_AVR_LDS_STS_16} | |
adde6300 AM |
663 | }; |
664 | ||
df406460 | 665 | /* Meant to be filled one day with the wrap around address for the |
4cdc7696 | 666 | specific device. I.e. should get the value 0x4000 for 16k devices, |
df406460 | 667 | 0x8000 for 32k devices and so on. |
4cdc7696 | 668 | |
df406460 | 669 | We initialize it here with a value of 0x1000000 resulting in |
4cdc7696 NC |
670 | that we will never suggest a wrap-around jump during relaxation. |
671 | The logic of the source code later on assumes that in | |
df406460 | 672 | avr_pc_wrap_around one single bit is set. */ |
28c9d252 NC |
673 | static bfd_vma avr_pc_wrap_around = 0x10000000; |
674 | ||
675 | /* If this variable holds a value different from zero, the linker relaxation | |
676 | machine will try to optimize call/ret sequences by a single jump | |
677 | instruction. This option could be switched off by a linker switch. */ | |
678 | static int avr_replace_call_ret_sequences = 1; | |
679 | \f | |
680 | /* Initialize an entry in the stub hash table. */ | |
681 | ||
682 | static struct bfd_hash_entry * | |
683 | stub_hash_newfunc (struct bfd_hash_entry *entry, | |
684 | struct bfd_hash_table *table, | |
685 | const char *string) | |
686 | { | |
687 | /* Allocate the structure if it has not already been allocated by a | |
688 | subclass. */ | |
689 | if (entry == NULL) | |
690 | { | |
691 | entry = bfd_hash_allocate (table, | |
692 | sizeof (struct elf32_avr_stub_hash_entry)); | |
693 | if (entry == NULL) | |
694 | return entry; | |
695 | } | |
696 | ||
697 | /* Call the allocation method of the superclass. */ | |
698 | entry = bfd_hash_newfunc (entry, table, string); | |
699 | if (entry != NULL) | |
700 | { | |
701 | struct elf32_avr_stub_hash_entry *hsh; | |
702 | ||
703 | /* Initialize the local fields. */ | |
704 | hsh = avr_stub_hash_entry (entry); | |
705 | hsh->stub_offset = 0; | |
706 | hsh->target_value = 0; | |
707 | } | |
708 | ||
709 | return entry; | |
710 | } | |
711 | ||
64ee10b6 NC |
712 | /* This function is just a straight passthrough to the real |
713 | function in linker.c. Its prupose is so that its address | |
714 | can be compared inside the avr_link_hash_table macro. */ | |
715 | ||
716 | static struct bfd_hash_entry * | |
717 | elf32_avr_link_hash_newfunc (struct bfd_hash_entry * entry, | |
718 | struct bfd_hash_table * table, | |
719 | const char * string) | |
720 | { | |
721 | return _bfd_elf_link_hash_newfunc (entry, table, string); | |
722 | } | |
723 | ||
68faa637 AM |
724 | /* Free the derived linker hash table. */ |
725 | ||
726 | static void | |
d495ab0d | 727 | elf32_avr_link_hash_table_free (bfd *obfd) |
68faa637 AM |
728 | { |
729 | struct elf32_avr_link_hash_table *htab | |
d495ab0d | 730 | = (struct elf32_avr_link_hash_table *) obfd->link.hash; |
68faa637 AM |
731 | |
732 | /* Free the address mapping table. */ | |
733 | if (htab->amt_stub_offsets != NULL) | |
734 | free (htab->amt_stub_offsets); | |
735 | if (htab->amt_destination_addr != NULL) | |
736 | free (htab->amt_destination_addr); | |
737 | ||
738 | bfd_hash_table_free (&htab->bstab); | |
d495ab0d | 739 | _bfd_elf_link_hash_table_free (obfd); |
68faa637 AM |
740 | } |
741 | ||
28c9d252 NC |
742 | /* Create the derived linker hash table. The AVR ELF port uses the derived |
743 | hash table to keep information specific to the AVR ELF linker (without | |
744 | using static variables). */ | |
745 | ||
746 | static struct bfd_link_hash_table * | |
747 | elf32_avr_link_hash_table_create (bfd *abfd) | |
748 | { | |
749 | struct elf32_avr_link_hash_table *htab; | |
750 | bfd_size_type amt = sizeof (*htab); | |
751 | ||
7bf52ea2 | 752 | htab = bfd_zmalloc (amt); |
28c9d252 NC |
753 | if (htab == NULL) |
754 | return NULL; | |
755 | ||
756 | if (!_bfd_elf_link_hash_table_init (&htab->etab, abfd, | |
64ee10b6 | 757 | elf32_avr_link_hash_newfunc, |
4dfe6ac6 NC |
758 | sizeof (struct elf_link_hash_entry), |
759 | AVR_ELF_DATA)) | |
28c9d252 NC |
760 | { |
761 | free (htab); | |
762 | return NULL; | |
763 | } | |
764 | ||
765 | /* Init the stub hash table too. */ | |
766 | if (!bfd_hash_table_init (&htab->bstab, stub_hash_newfunc, | |
767 | sizeof (struct elf32_avr_stub_hash_entry))) | |
d495ab0d AM |
768 | { |
769 | _bfd_elf_link_hash_table_free (abfd); | |
770 | return NULL; | |
771 | } | |
772 | htab->etab.root.hash_table_free = elf32_avr_link_hash_table_free; | |
4cdc7696 | 773 | |
28c9d252 NC |
774 | return &htab->etab.root; |
775 | } | |
776 | ||
df406460 | 777 | /* Calculates the effective distance of a pc relative jump/call. */ |
73160847 | 778 | |
df406460 NC |
779 | static int |
780 | avr_relative_distance_considering_wrap_around (unsigned int distance) | |
4cdc7696 | 781 | { |
df406460 | 782 | unsigned int wrap_around_mask = avr_pc_wrap_around - 1; |
df406460 NC |
783 | int dist_with_wrap_around = distance & wrap_around_mask; |
784 | ||
4cdc7696 | 785 | if (dist_with_wrap_around > ((int) (avr_pc_wrap_around >> 1))) |
df406460 NC |
786 | dist_with_wrap_around -= avr_pc_wrap_around; |
787 | ||
788 | return dist_with_wrap_around; | |
789 | } | |
790 | ||
791 | ||
adde6300 | 792 | static reloc_howto_type * |
4cdc7696 NC |
793 | bfd_elf32_bfd_reloc_type_lookup (bfd *abfd ATTRIBUTE_UNUSED, |
794 | bfd_reloc_code_real_type code) | |
adde6300 AM |
795 | { |
796 | unsigned int i; | |
797 | ||
798 | for (i = 0; | |
799 | i < sizeof (avr_reloc_map) / sizeof (struct avr_reloc_map); | |
800 | i++) | |
73160847 NC |
801 | if (avr_reloc_map[i].bfd_reloc_val == code) |
802 | return &elf_avr_howto_table[avr_reloc_map[i].elf_reloc_val]; | |
adde6300 AM |
803 | |
804 | return NULL; | |
805 | } | |
806 | ||
157090f7 AM |
807 | static reloc_howto_type * |
808 | bfd_elf32_bfd_reloc_name_lookup (bfd *abfd ATTRIBUTE_UNUSED, | |
809 | const char *r_name) | |
810 | { | |
811 | unsigned int i; | |
812 | ||
813 | for (i = 0; | |
814 | i < sizeof (elf_avr_howto_table) / sizeof (elf_avr_howto_table[0]); | |
815 | i++) | |
816 | if (elf_avr_howto_table[i].name != NULL | |
817 | && strcasecmp (elf_avr_howto_table[i].name, r_name) == 0) | |
818 | return &elf_avr_howto_table[i]; | |
819 | ||
820 | return NULL; | |
821 | } | |
822 | ||
adde6300 AM |
823 | /* Set the howto pointer for an AVR ELF reloc. */ |
824 | ||
825 | static void | |
4cdc7696 NC |
826 | avr_info_to_howto_rela (bfd *abfd ATTRIBUTE_UNUSED, |
827 | arelent *cache_ptr, | |
828 | Elf_Internal_Rela *dst) | |
adde6300 AM |
829 | { |
830 | unsigned int r_type; | |
831 | ||
832 | r_type = ELF32_R_TYPE (dst->r_info); | |
833 | BFD_ASSERT (r_type < (unsigned int) R_AVR_max); | |
834 | cache_ptr->howto = &elf_avr_howto_table[r_type]; | |
835 | } | |
836 | ||
28c9d252 NC |
837 | static bfd_boolean |
838 | avr_stub_is_required_for_16_bit_reloc (bfd_vma relocation) | |
839 | { | |
840 | return (relocation >= 0x020000); | |
841 | } | |
842 | ||
843 | /* Returns the address of the corresponding stub if there is one. | |
844 | Returns otherwise an address above 0x020000. This function | |
845 | could also be used, if there is no knowledge on the section where | |
846 | the destination is found. */ | |
847 | ||
848 | static bfd_vma | |
849 | avr_get_stub_addr (bfd_vma srel, | |
850 | struct elf32_avr_link_hash_table *htab) | |
851 | { | |
91d6fa6a | 852 | unsigned int sindex; |
28c9d252 NC |
853 | bfd_vma stub_sec_addr = |
854 | (htab->stub_sec->output_section->vma + | |
855 | htab->stub_sec->output_offset); | |
856 | ||
91d6fa6a NC |
857 | for (sindex = 0; sindex < htab->amt_max_entry_cnt; sindex ++) |
858 | if (htab->amt_destination_addr[sindex] == srel) | |
859 | return htab->amt_stub_offsets[sindex] + stub_sec_addr; | |
28c9d252 NC |
860 | |
861 | /* Return an address that could not be reached by 16 bit relocs. */ | |
862 | return 0x020000; | |
863 | } | |
864 | ||
e4ef1b6c DC |
865 | /* Perform a diff relocation. Nothing to do, as the difference value is already |
866 | written into the section's contents. */ | |
867 | ||
868 | static bfd_reloc_status_type | |
869 | bfd_elf_avr_diff_reloc (bfd *abfd ATTRIBUTE_UNUSED, | |
870 | arelent *reloc_entry ATTRIBUTE_UNUSED, | |
871 | asymbol *symbol ATTRIBUTE_UNUSED, | |
872 | void *data ATTRIBUTE_UNUSED, | |
873 | asection *input_section ATTRIBUTE_UNUSED, | |
874 | bfd *output_bfd ATTRIBUTE_UNUSED, | |
875 | char **error_message ATTRIBUTE_UNUSED) | |
876 | { | |
877 | return bfd_reloc_ok; | |
878 | } | |
879 | ||
880 | ||
adde6300 AM |
881 | /* Perform a single relocation. By default we use the standard BFD |
882 | routines, but a few relocs, we have to do them ourselves. */ | |
883 | ||
884 | static bfd_reloc_status_type | |
28c9d252 NC |
885 | avr_final_link_relocate (reloc_howto_type * howto, |
886 | bfd * input_bfd, | |
887 | asection * input_section, | |
888 | bfd_byte * contents, | |
889 | Elf_Internal_Rela * rel, | |
890 | bfd_vma relocation, | |
891 | struct elf32_avr_link_hash_table * htab) | |
adde6300 AM |
892 | { |
893 | bfd_reloc_status_type r = bfd_reloc_ok; | |
894 | bfd_vma x; | |
895 | bfd_signed_vma srel; | |
28c9d252 NC |
896 | bfd_signed_vma reloc_addr; |
897 | bfd_boolean use_stubs = FALSE; | |
898 | /* Usually is 0, unless we are generating code for a bootloader. */ | |
899 | bfd_signed_vma base_addr = htab->vector_base; | |
900 | ||
901 | /* Absolute addr of the reloc in the final excecutable. */ | |
902 | reloc_addr = rel->r_offset + input_section->output_section->vma | |
903 | + input_section->output_offset; | |
adde6300 AM |
904 | |
905 | switch (howto->type) | |
906 | { | |
907 | case R_AVR_7_PCREL: | |
908 | contents += rel->r_offset; | |
909 | srel = (bfd_signed_vma) relocation; | |
910 | srel += rel->r_addend; | |
911 | srel -= rel->r_offset; | |
a7c10850 | 912 | srel -= 2; /* Branch instructions add 2 to the PC... */ |
adde6300 AM |
913 | srel -= (input_section->output_section->vma + |
914 | input_section->output_offset); | |
915 | ||
916 | if (srel & 1) | |
917 | return bfd_reloc_outofrange; | |
918 | if (srel > ((1 << 7) - 1) || (srel < - (1 << 7))) | |
919 | return bfd_reloc_overflow; | |
920 | x = bfd_get_16 (input_bfd, contents); | |
921 | x = (x & 0xfc07) | (((srel >> 1) << 3) & 0x3f8); | |
922 | bfd_put_16 (input_bfd, x, contents); | |
923 | break; | |
924 | ||
925 | case R_AVR_13_PCREL: | |
926 | contents += rel->r_offset; | |
927 | srel = (bfd_signed_vma) relocation; | |
928 | srel += rel->r_addend; | |
929 | srel -= rel->r_offset; | |
a7c10850 | 930 | srel -= 2; /* Branch instructions add 2 to the PC... */ |
adde6300 AM |
931 | srel -= (input_section->output_section->vma + |
932 | input_section->output_offset); | |
933 | ||
934 | if (srel & 1) | |
935 | return bfd_reloc_outofrange; | |
936 | ||
df406460 NC |
937 | srel = avr_relative_distance_considering_wrap_around (srel); |
938 | ||
adde6300 AM |
939 | /* AVR addresses commands as words. */ |
940 | srel >>= 1; | |
941 | ||
942 | /* Check for overflow. */ | |
943 | if (srel < -2048 || srel > 2047) | |
944 | { | |
df406460 NC |
945 | /* Relative distance is too large. */ |
946 | ||
654c3c9f | 947 | /* Always apply WRAPAROUND for avr2, avr25, and avr4. */ |
65aa24b6 | 948 | switch (bfd_get_mach (input_bfd)) |
adde6300 | 949 | { |
65aa24b6 | 950 | case bfd_mach_avr2: |
654c3c9f | 951 | case bfd_mach_avr25: |
65aa24b6 NC |
952 | case bfd_mach_avr4: |
953 | break; | |
954 | ||
955 | default: | |
956 | return bfd_reloc_overflow; | |
adde6300 | 957 | } |
adde6300 AM |
958 | } |
959 | ||
960 | x = bfd_get_16 (input_bfd, contents); | |
961 | x = (x & 0xf000) | (srel & 0xfff); | |
962 | bfd_put_16 (input_bfd, x, contents); | |
963 | break; | |
964 | ||
965 | case R_AVR_LO8_LDI: | |
966 | contents += rel->r_offset; | |
967 | srel = (bfd_signed_vma) relocation + rel->r_addend; | |
968 | x = bfd_get_16 (input_bfd, contents); | |
969 | x = (x & 0xf0f0) | (srel & 0xf) | ((srel << 4) & 0xf00); | |
970 | bfd_put_16 (input_bfd, x, contents); | |
971 | break; | |
972 | ||
750bce0e NC |
973 | case R_AVR_LDI: |
974 | contents += rel->r_offset; | |
975 | srel = (bfd_signed_vma) relocation + rel->r_addend; | |
4cdc7696 NC |
976 | if (((srel > 0) && (srel & 0xffff) > 255) |
977 | || ((srel < 0) && ((-srel) & 0xffff) > 128)) | |
df406460 NC |
978 | /* Remove offset for data/eeprom section. */ |
979 | return bfd_reloc_overflow; | |
980 | ||
750bce0e NC |
981 | x = bfd_get_16 (input_bfd, contents); |
982 | x = (x & 0xf0f0) | (srel & 0xf) | ((srel << 4) & 0xf00); | |
983 | bfd_put_16 (input_bfd, x, contents); | |
984 | break; | |
985 | ||
986 | case R_AVR_6: | |
987 | contents += rel->r_offset; | |
988 | srel = (bfd_signed_vma) relocation + rel->r_addend; | |
989 | if (((srel & 0xffff) > 63) || (srel < 0)) | |
990 | /* Remove offset for data/eeprom section. */ | |
991 | return bfd_reloc_overflow; | |
992 | x = bfd_get_16 (input_bfd, contents); | |
4cdc7696 | 993 | x = (x & 0xd3f8) | ((srel & 7) | ((srel & (3 << 3)) << 7) |
df406460 | 994 | | ((srel & (1 << 5)) << 8)); |
750bce0e NC |
995 | bfd_put_16 (input_bfd, x, contents); |
996 | break; | |
997 | ||
998 | case R_AVR_6_ADIW: | |
999 | contents += rel->r_offset; | |
1000 | srel = (bfd_signed_vma) relocation + rel->r_addend; | |
1001 | if (((srel & 0xffff) > 63) || (srel < 0)) | |
1002 | /* Remove offset for data/eeprom section. */ | |
1003 | return bfd_reloc_overflow; | |
1004 | x = bfd_get_16 (input_bfd, contents); | |
4cdc7696 | 1005 | x = (x & 0xff30) | (srel & 0xf) | ((srel & 0x30) << 2); |
750bce0e NC |
1006 | bfd_put_16 (input_bfd, x, contents); |
1007 | break; | |
1008 | ||
adde6300 AM |
1009 | case R_AVR_HI8_LDI: |
1010 | contents += rel->r_offset; | |
1011 | srel = (bfd_signed_vma) relocation + rel->r_addend; | |
1012 | srel = (srel >> 8) & 0xff; | |
1013 | x = bfd_get_16 (input_bfd, contents); | |
1014 | x = (x & 0xf0f0) | (srel & 0xf) | ((srel << 4) & 0xf00); | |
1015 | bfd_put_16 (input_bfd, x, contents); | |
1016 | break; | |
1017 | ||
1018 | case R_AVR_HH8_LDI: | |
1019 | contents += rel->r_offset; | |
1020 | srel = (bfd_signed_vma) relocation + rel->r_addend; | |
1021 | srel = (srel >> 16) & 0xff; | |
1022 | x = bfd_get_16 (input_bfd, contents); | |
1023 | x = (x & 0xf0f0) | (srel & 0xf) | ((srel << 4) & 0xf00); | |
1024 | bfd_put_16 (input_bfd, x, contents); | |
1025 | break; | |
1026 | ||
df406460 NC |
1027 | case R_AVR_MS8_LDI: |
1028 | contents += rel->r_offset; | |
1029 | srel = (bfd_signed_vma) relocation + rel->r_addend; | |
1030 | srel = (srel >> 24) & 0xff; | |
1031 | x = bfd_get_16 (input_bfd, contents); | |
1032 | x = (x & 0xf0f0) | (srel & 0xf) | ((srel << 4) & 0xf00); | |
1033 | bfd_put_16 (input_bfd, x, contents); | |
1034 | break; | |
1035 | ||
adde6300 AM |
1036 | case R_AVR_LO8_LDI_NEG: |
1037 | contents += rel->r_offset; | |
1038 | srel = (bfd_signed_vma) relocation + rel->r_addend; | |
1039 | srel = -srel; | |
1040 | x = bfd_get_16 (input_bfd, contents); | |
1041 | x = (x & 0xf0f0) | (srel & 0xf) | ((srel << 4) & 0xf00); | |
1042 | bfd_put_16 (input_bfd, x, contents); | |
1043 | break; | |
1044 | ||
1045 | case R_AVR_HI8_LDI_NEG: | |
1046 | contents += rel->r_offset; | |
1047 | srel = (bfd_signed_vma) relocation + rel->r_addend; | |
1048 | srel = -srel; | |
1049 | srel = (srel >> 8) & 0xff; | |
1050 | x = bfd_get_16 (input_bfd, contents); | |
1051 | x = (x & 0xf0f0) | (srel & 0xf) | ((srel << 4) & 0xf00); | |
1052 | bfd_put_16 (input_bfd, x, contents); | |
1053 | break; | |
1054 | ||
1055 | case R_AVR_HH8_LDI_NEG: | |
1056 | contents += rel->r_offset; | |
1057 | srel = (bfd_signed_vma) relocation + rel->r_addend; | |
1058 | srel = -srel; | |
1059 | srel = (srel >> 16) & 0xff; | |
1060 | x = bfd_get_16 (input_bfd, contents); | |
1061 | x = (x & 0xf0f0) | (srel & 0xf) | ((srel << 4) & 0xf00); | |
1062 | bfd_put_16 (input_bfd, x, contents); | |
1063 | break; | |
1064 | ||
df406460 NC |
1065 | case R_AVR_MS8_LDI_NEG: |
1066 | contents += rel->r_offset; | |
1067 | srel = (bfd_signed_vma) relocation + rel->r_addend; | |
1068 | srel = -srel; | |
1069 | srel = (srel >> 24) & 0xff; | |
1070 | x = bfd_get_16 (input_bfd, contents); | |
1071 | x = (x & 0xf0f0) | (srel & 0xf) | ((srel << 4) & 0xf00); | |
1072 | bfd_put_16 (input_bfd, x, contents); | |
1073 | break; | |
1074 | ||
28c9d252 NC |
1075 | case R_AVR_LO8_LDI_GS: |
1076 | use_stubs = (!htab->no_stubs); | |
1077 | /* Fall through. */ | |
adde6300 AM |
1078 | case R_AVR_LO8_LDI_PM: |
1079 | contents += rel->r_offset; | |
1080 | srel = (bfd_signed_vma) relocation + rel->r_addend; | |
28c9d252 NC |
1081 | |
1082 | if (use_stubs | |
1083 | && avr_stub_is_required_for_16_bit_reloc (srel - base_addr)) | |
1084 | { | |
1085 | bfd_vma old_srel = srel; | |
1086 | ||
1087 | /* We need to use the address of the stub instead. */ | |
1088 | srel = avr_get_stub_addr (srel, htab); | |
1089 | if (debug_stubs) | |
1090 | printf ("LD: Using jump stub (at 0x%x) with destination 0x%x for " | |
1091 | "reloc at address 0x%x.\n", | |
1092 | (unsigned int) srel, | |
1093 | (unsigned int) old_srel, | |
1094 | (unsigned int) reloc_addr); | |
1095 | ||
1096 | if (avr_stub_is_required_for_16_bit_reloc (srel - base_addr)) | |
1097 | return bfd_reloc_outofrange; | |
1098 | } | |
1099 | ||
adde6300 AM |
1100 | if (srel & 1) |
1101 | return bfd_reloc_outofrange; | |
1102 | srel = srel >> 1; | |
1103 | x = bfd_get_16 (input_bfd, contents); | |
1104 | x = (x & 0xf0f0) | (srel & 0xf) | ((srel << 4) & 0xf00); | |
1105 | bfd_put_16 (input_bfd, x, contents); | |
1106 | break; | |
1107 | ||
28c9d252 NC |
1108 | case R_AVR_HI8_LDI_GS: |
1109 | use_stubs = (!htab->no_stubs); | |
1110 | /* Fall through. */ | |
adde6300 AM |
1111 | case R_AVR_HI8_LDI_PM: |
1112 | contents += rel->r_offset; | |
1113 | srel = (bfd_signed_vma) relocation + rel->r_addend; | |
28c9d252 NC |
1114 | |
1115 | if (use_stubs | |
1116 | && avr_stub_is_required_for_16_bit_reloc (srel - base_addr)) | |
1117 | { | |
1118 | bfd_vma old_srel = srel; | |
1119 | ||
1120 | /* We need to use the address of the stub instead. */ | |
1121 | srel = avr_get_stub_addr (srel, htab); | |
1122 | if (debug_stubs) | |
1123 | printf ("LD: Using jump stub (at 0x%x) with destination 0x%x for " | |
1124 | "reloc at address 0x%x.\n", | |
1125 | (unsigned int) srel, | |
1126 | (unsigned int) old_srel, | |
1127 | (unsigned int) reloc_addr); | |
1128 | ||
1129 | if (avr_stub_is_required_for_16_bit_reloc (srel - base_addr)) | |
1130 | return bfd_reloc_outofrange; | |
1131 | } | |
1132 | ||
adde6300 AM |
1133 | if (srel & 1) |
1134 | return bfd_reloc_outofrange; | |
1135 | srel = srel >> 1; | |
1136 | srel = (srel >> 8) & 0xff; | |
1137 | x = bfd_get_16 (input_bfd, contents); | |
1138 | x = (x & 0xf0f0) | (srel & 0xf) | ((srel << 4) & 0xf00); | |
1139 | bfd_put_16 (input_bfd, x, contents); | |
1140 | break; | |
1141 | ||
1142 | case R_AVR_HH8_LDI_PM: | |
1143 | contents += rel->r_offset; | |
1144 | srel = (bfd_signed_vma) relocation + rel->r_addend; | |
1145 | if (srel & 1) | |
1146 | return bfd_reloc_outofrange; | |
1147 | srel = srel >> 1; | |
1148 | srel = (srel >> 16) & 0xff; | |
1149 | x = bfd_get_16 (input_bfd, contents); | |
1150 | x = (x & 0xf0f0) | (srel & 0xf) | ((srel << 4) & 0xf00); | |
1151 | bfd_put_16 (input_bfd, x, contents); | |
1152 | break; | |
1153 | ||
1154 | case R_AVR_LO8_LDI_PM_NEG: | |
1155 | contents += rel->r_offset; | |
1156 | srel = (bfd_signed_vma) relocation + rel->r_addend; | |
1157 | srel = -srel; | |
1158 | if (srel & 1) | |
1159 | return bfd_reloc_outofrange; | |
1160 | srel = srel >> 1; | |
1161 | x = bfd_get_16 (input_bfd, contents); | |
1162 | x = (x & 0xf0f0) | (srel & 0xf) | ((srel << 4) & 0xf00); | |
1163 | bfd_put_16 (input_bfd, x, contents); | |
1164 | break; | |
1165 | ||
1166 | case R_AVR_HI8_LDI_PM_NEG: | |
1167 | contents += rel->r_offset; | |
1168 | srel = (bfd_signed_vma) relocation + rel->r_addend; | |
1169 | srel = -srel; | |
1170 | if (srel & 1) | |
1171 | return bfd_reloc_outofrange; | |
1172 | srel = srel >> 1; | |
1173 | srel = (srel >> 8) & 0xff; | |
1174 | x = bfd_get_16 (input_bfd, contents); | |
1175 | x = (x & 0xf0f0) | (srel & 0xf) | ((srel << 4) & 0xf00); | |
1176 | bfd_put_16 (input_bfd, x, contents); | |
1177 | break; | |
1178 | ||
1179 | case R_AVR_HH8_LDI_PM_NEG: | |
1180 | contents += rel->r_offset; | |
1181 | srel = (bfd_signed_vma) relocation + rel->r_addend; | |
1182 | srel = -srel; | |
1183 | if (srel & 1) | |
1184 | return bfd_reloc_outofrange; | |
1185 | srel = srel >> 1; | |
1186 | srel = (srel >> 16) & 0xff; | |
1187 | x = bfd_get_16 (input_bfd, contents); | |
1188 | x = (x & 0xf0f0) | (srel & 0xf) | ((srel << 4) & 0xf00); | |
1189 | bfd_put_16 (input_bfd, x, contents); | |
1190 | break; | |
1191 | ||
1192 | case R_AVR_CALL: | |
1193 | contents += rel->r_offset; | |
1194 | srel = (bfd_signed_vma) relocation + rel->r_addend; | |
1195 | if (srel & 1) | |
1196 | return bfd_reloc_outofrange; | |
1197 | srel = srel >> 1; | |
1198 | x = bfd_get_16 (input_bfd, contents); | |
1199 | x |= ((srel & 0x10000) | ((srel << 3) & 0x1f00000)) >> 16; | |
1200 | bfd_put_16 (input_bfd, x, contents); | |
dc810e39 | 1201 | bfd_put_16 (input_bfd, (bfd_vma) srel & 0xffff, contents+2); |
adde6300 AM |
1202 | break; |
1203 | ||
28c9d252 NC |
1204 | case R_AVR_16_PM: |
1205 | use_stubs = (!htab->no_stubs); | |
1206 | contents += rel->r_offset; | |
1207 | srel = (bfd_signed_vma) relocation + rel->r_addend; | |
1208 | ||
1209 | if (use_stubs | |
1210 | && avr_stub_is_required_for_16_bit_reloc (srel - base_addr)) | |
1211 | { | |
1212 | bfd_vma old_srel = srel; | |
1213 | ||
1214 | /* We need to use the address of the stub instead. */ | |
1215 | srel = avr_get_stub_addr (srel,htab); | |
1216 | if (debug_stubs) | |
1217 | printf ("LD: Using jump stub (at 0x%x) with destination 0x%x for " | |
1218 | "reloc at address 0x%x.\n", | |
1219 | (unsigned int) srel, | |
1220 | (unsigned int) old_srel, | |
1221 | (unsigned int) reloc_addr); | |
1222 | ||
1223 | if (avr_stub_is_required_for_16_bit_reloc (srel - base_addr)) | |
1224 | return bfd_reloc_outofrange; | |
1225 | } | |
1226 | ||
1227 | if (srel & 1) | |
1228 | return bfd_reloc_outofrange; | |
1229 | srel = srel >> 1; | |
1230 | bfd_put_16 (input_bfd, (bfd_vma) srel &0x00ffff, contents); | |
1231 | break; | |
1232 | ||
e4ef1b6c DC |
1233 | case R_AVR_DIFF8: |
1234 | case R_AVR_DIFF16: | |
1235 | case R_AVR_DIFF32: | |
1236 | /* Nothing to do here, as contents already contains the diff value. */ | |
1237 | r = bfd_reloc_ok; | |
1238 | break; | |
1239 | ||
f36e8886 BS |
1240 | case R_AVR_LDS_STS_16: |
1241 | contents += rel->r_offset; | |
1242 | srel = (bfd_signed_vma) relocation + rel->r_addend; | |
1243 | if ((srel & 0xFFFF) < 0x40 || (srel & 0xFFFF) > 0xbf) | |
1244 | return bfd_reloc_outofrange; | |
1245 | srel = srel & 0x7f; | |
1246 | x = bfd_get_16 (input_bfd, contents); | |
1247 | x |= (srel & 0x0f) | ((srel & 0x30) << 5) | ((srel & 0x40) << 2); | |
1248 | bfd_put_16 (input_bfd, x, contents); | |
1249 | break; | |
1250 | ||
adde6300 AM |
1251 | default: |
1252 | r = _bfd_final_link_relocate (howto, input_bfd, input_section, | |
1253 | contents, rel->r_offset, | |
1254 | relocation, rel->r_addend); | |
1255 | } | |
1256 | ||
1257 | return r; | |
1258 | } | |
1259 | ||
1260 | /* Relocate an AVR ELF section. */ | |
4cdc7696 | 1261 | |
b34976b6 | 1262 | static bfd_boolean |
4cdc7696 NC |
1263 | elf32_avr_relocate_section (bfd *output_bfd ATTRIBUTE_UNUSED, |
1264 | struct bfd_link_info *info, | |
1265 | bfd *input_bfd, | |
1266 | asection *input_section, | |
1267 | bfd_byte *contents, | |
1268 | Elf_Internal_Rela *relocs, | |
1269 | Elf_Internal_Sym *local_syms, | |
1270 | asection **local_sections) | |
adde6300 AM |
1271 | { |
1272 | Elf_Internal_Shdr * symtab_hdr; | |
1273 | struct elf_link_hash_entry ** sym_hashes; | |
1274 | Elf_Internal_Rela * rel; | |
1275 | Elf_Internal_Rela * relend; | |
28c9d252 | 1276 | struct elf32_avr_link_hash_table * htab = avr_link_hash_table (info); |
adde6300 | 1277 | |
4dfe6ac6 NC |
1278 | if (htab == NULL) |
1279 | return FALSE; | |
1280 | ||
adde6300 AM |
1281 | symtab_hdr = & elf_tdata (input_bfd)->symtab_hdr; |
1282 | sym_hashes = elf_sym_hashes (input_bfd); | |
1283 | relend = relocs + input_section->reloc_count; | |
1284 | ||
1285 | for (rel = relocs; rel < relend; rel ++) | |
1286 | { | |
1287 | reloc_howto_type * howto; | |
1288 | unsigned long r_symndx; | |
1289 | Elf_Internal_Sym * sym; | |
1290 | asection * sec; | |
1291 | struct elf_link_hash_entry * h; | |
1292 | bfd_vma relocation; | |
1293 | bfd_reloc_status_type r; | |
dfeffb9f | 1294 | const char * name; |
adde6300 AM |
1295 | int r_type; |
1296 | ||
1297 | r_type = ELF32_R_TYPE (rel->r_info); | |
1298 | r_symndx = ELF32_R_SYM (rel->r_info); | |
c7e2358a | 1299 | howto = elf_avr_howto_table + r_type; |
adde6300 AM |
1300 | h = NULL; |
1301 | sym = NULL; | |
1302 | sec = NULL; | |
1303 | ||
1304 | if (r_symndx < symtab_hdr->sh_info) | |
1305 | { | |
1306 | sym = local_syms + r_symndx; | |
1307 | sec = local_sections [r_symndx]; | |
8517fae7 | 1308 | relocation = _bfd_elf_rela_local_sym (output_bfd, sym, &sec, rel); |
adde6300 AM |
1309 | |
1310 | name = bfd_elf_string_from_elf_section | |
1311 | (input_bfd, symtab_hdr->sh_link, sym->st_name); | |
1312 | name = (name == NULL) ? bfd_section_name (input_bfd, sec) : name; | |
1313 | } | |
1314 | else | |
1315 | { | |
62d887d4 | 1316 | bfd_boolean unresolved_reloc, warned, ignored; |
adde6300 | 1317 | |
b2a8e766 AM |
1318 | RELOC_FOR_GLOBAL_SYMBOL (info, input_bfd, input_section, rel, |
1319 | r_symndx, symtab_hdr, sym_hashes, | |
1320 | h, sec, relocation, | |
62d887d4 | 1321 | unresolved_reloc, warned, ignored); |
dfeffb9f L |
1322 | |
1323 | name = h->root.root.string; | |
adde6300 AM |
1324 | } |
1325 | ||
dbaa2011 | 1326 | if (sec != NULL && discarded_section (sec)) |
e4067dbb | 1327 | RELOC_AGAINST_DISCARDED_SECTION (info, input_bfd, input_section, |
545fd46b | 1328 | rel, 1, relend, howto, 0, contents); |
ab96bf03 AM |
1329 | |
1330 | if (info->relocatable) | |
1331 | continue; | |
1332 | ||
adde6300 | 1333 | r = avr_final_link_relocate (howto, input_bfd, input_section, |
28c9d252 | 1334 | contents, rel, relocation, htab); |
adde6300 AM |
1335 | |
1336 | if (r != bfd_reloc_ok) | |
1337 | { | |
1338 | const char * msg = (const char *) NULL; | |
1339 | ||
1340 | switch (r) | |
1341 | { | |
1342 | case bfd_reloc_overflow: | |
1343 | r = info->callbacks->reloc_overflow | |
dfeffb9f L |
1344 | (info, (h ? &h->root : NULL), |
1345 | name, howto->name, (bfd_vma) 0, | |
adde6300 AM |
1346 | input_bfd, input_section, rel->r_offset); |
1347 | break; | |
1348 | ||
1349 | case bfd_reloc_undefined: | |
1350 | r = info->callbacks->undefined_symbol | |
b34976b6 | 1351 | (info, name, input_bfd, input_section, rel->r_offset, TRUE); |
adde6300 AM |
1352 | break; |
1353 | ||
1354 | case bfd_reloc_outofrange: | |
1355 | msg = _("internal error: out of range error"); | |
1356 | break; | |
1357 | ||
1358 | case bfd_reloc_notsupported: | |
1359 | msg = _("internal error: unsupported relocation error"); | |
1360 | break; | |
1361 | ||
1362 | case bfd_reloc_dangerous: | |
1363 | msg = _("internal error: dangerous relocation"); | |
1364 | break; | |
1365 | ||
1366 | default: | |
1367 | msg = _("internal error: unknown error"); | |
1368 | break; | |
1369 | } | |
1370 | ||
1371 | if (msg) | |
1372 | r = info->callbacks->warning | |
1373 | (info, msg, name, input_bfd, input_section, rel->r_offset); | |
1374 | ||
1375 | if (! r) | |
b34976b6 | 1376 | return FALSE; |
adde6300 AM |
1377 | } |
1378 | } | |
1379 | ||
b34976b6 | 1380 | return TRUE; |
adde6300 AM |
1381 | } |
1382 | ||
1383 | /* The final processing done just before writing out a AVR ELF object | |
1384 | file. This gets the AVR architecture right based on the machine | |
1385 | number. */ | |
1386 | ||
1387 | static void | |
4cdc7696 NC |
1388 | bfd_elf_avr_final_write_processing (bfd *abfd, |
1389 | bfd_boolean linker ATTRIBUTE_UNUSED) | |
adde6300 AM |
1390 | { |
1391 | unsigned long val; | |
1392 | ||
1393 | switch (bfd_get_mach (abfd)) | |
1394 | { | |
1395 | default: | |
1396 | case bfd_mach_avr2: | |
1397 | val = E_AVR_MACH_AVR2; | |
1398 | break; | |
1399 | ||
1400 | case bfd_mach_avr1: | |
1401 | val = E_AVR_MACH_AVR1; | |
1402 | break; | |
1403 | ||
7b21ac3f EW |
1404 | case bfd_mach_avr25: |
1405 | val = E_AVR_MACH_AVR25; | |
28b02751 | 1406 | break; |
7b21ac3f | 1407 | |
adde6300 AM |
1408 | case bfd_mach_avr3: |
1409 | val = E_AVR_MACH_AVR3; | |
1410 | break; | |
1411 | ||
7b21ac3f EW |
1412 | case bfd_mach_avr31: |
1413 | val = E_AVR_MACH_AVR31; | |
28b02751 | 1414 | break; |
7b21ac3f EW |
1415 | |
1416 | case bfd_mach_avr35: | |
1417 | val = E_AVR_MACH_AVR35; | |
28b02751 | 1418 | break; |
7b21ac3f | 1419 | |
adde6300 AM |
1420 | case bfd_mach_avr4: |
1421 | val = E_AVR_MACH_AVR4; | |
1422 | break; | |
1423 | ||
65aa24b6 NC |
1424 | case bfd_mach_avr5: |
1425 | val = E_AVR_MACH_AVR5; | |
1426 | break; | |
28c9d252 | 1427 | |
7b21ac3f EW |
1428 | case bfd_mach_avr51: |
1429 | val = E_AVR_MACH_AVR51; | |
1430 | break; | |
1431 | ||
28c9d252 NC |
1432 | case bfd_mach_avr6: |
1433 | val = E_AVR_MACH_AVR6; | |
1434 | break; | |
8cc66334 EW |
1435 | |
1436 | case bfd_mach_avrxmega1: | |
1437 | val = E_AVR_MACH_XMEGA1; | |
1438 | break; | |
1439 | ||
1440 | case bfd_mach_avrxmega2: | |
1441 | val = E_AVR_MACH_XMEGA2; | |
1442 | break; | |
1443 | ||
1444 | case bfd_mach_avrxmega3: | |
1445 | val = E_AVR_MACH_XMEGA3; | |
1446 | break; | |
1447 | ||
1448 | case bfd_mach_avrxmega4: | |
1449 | val = E_AVR_MACH_XMEGA4; | |
1450 | break; | |
1451 | ||
1452 | case bfd_mach_avrxmega5: | |
1453 | val = E_AVR_MACH_XMEGA5; | |
1454 | break; | |
1455 | ||
1456 | case bfd_mach_avrxmega6: | |
1457 | val = E_AVR_MACH_XMEGA6; | |
1458 | break; | |
1459 | ||
1460 | case bfd_mach_avrxmega7: | |
1461 | val = E_AVR_MACH_XMEGA7; | |
1462 | break; | |
f36e8886 BS |
1463 | |
1464 | case bfd_mach_avrtiny: | |
1465 | val = E_AVR_MACH_AVRTINY; | |
1466 | break; | |
adde6300 AM |
1467 | } |
1468 | ||
1469 | elf_elfheader (abfd)->e_machine = EM_AVR; | |
1470 | elf_elfheader (abfd)->e_flags &= ~ EF_AVR_MACH; | |
1471 | elf_elfheader (abfd)->e_flags |= val; | |
df406460 | 1472 | elf_elfheader (abfd)->e_flags |= EF_AVR_LINKRELAX_PREPARED; |
adde6300 AM |
1473 | } |
1474 | ||
1475 | /* Set the right machine number. */ | |
1476 | ||
b34976b6 | 1477 | static bfd_boolean |
4cdc7696 | 1478 | elf32_avr_object_p (bfd *abfd) |
adde6300 | 1479 | { |
dc810e39 | 1480 | unsigned int e_set = bfd_mach_avr2; |
4cdc7696 | 1481 | |
aa4f99bb AO |
1482 | if (elf_elfheader (abfd)->e_machine == EM_AVR |
1483 | || elf_elfheader (abfd)->e_machine == EM_AVR_OLD) | |
adde6300 AM |
1484 | { |
1485 | int e_mach = elf_elfheader (abfd)->e_flags & EF_AVR_MACH; | |
4cdc7696 | 1486 | |
adde6300 AM |
1487 | switch (e_mach) |
1488 | { | |
1489 | default: | |
1490 | case E_AVR_MACH_AVR2: | |
1491 | e_set = bfd_mach_avr2; | |
1492 | break; | |
1493 | ||
1494 | case E_AVR_MACH_AVR1: | |
1495 | e_set = bfd_mach_avr1; | |
1496 | break; | |
1497 | ||
7b21ac3f EW |
1498 | case E_AVR_MACH_AVR25: |
1499 | e_set = bfd_mach_avr25; | |
1500 | break; | |
1501 | ||
adde6300 AM |
1502 | case E_AVR_MACH_AVR3: |
1503 | e_set = bfd_mach_avr3; | |
1504 | break; | |
1505 | ||
7b21ac3f EW |
1506 | case E_AVR_MACH_AVR31: |
1507 | e_set = bfd_mach_avr31; | |
1508 | break; | |
1509 | ||
1510 | case E_AVR_MACH_AVR35: | |
1511 | e_set = bfd_mach_avr35; | |
1512 | break; | |
1513 | ||
adde6300 AM |
1514 | case E_AVR_MACH_AVR4: |
1515 | e_set = bfd_mach_avr4; | |
1516 | break; | |
65aa24b6 NC |
1517 | |
1518 | case E_AVR_MACH_AVR5: | |
1519 | e_set = bfd_mach_avr5; | |
1520 | break; | |
28c9d252 | 1521 | |
7b21ac3f EW |
1522 | case E_AVR_MACH_AVR51: |
1523 | e_set = bfd_mach_avr51; | |
1524 | break; | |
1525 | ||
28c9d252 NC |
1526 | case E_AVR_MACH_AVR6: |
1527 | e_set = bfd_mach_avr6; | |
1528 | break; | |
8cc66334 EW |
1529 | |
1530 | case E_AVR_MACH_XMEGA1: | |
1531 | e_set = bfd_mach_avrxmega1; | |
1532 | break; | |
1533 | ||
1534 | case E_AVR_MACH_XMEGA2: | |
1535 | e_set = bfd_mach_avrxmega2; | |
1536 | break; | |
1537 | ||
1538 | case E_AVR_MACH_XMEGA3: | |
1539 | e_set = bfd_mach_avrxmega3; | |
1540 | break; | |
1541 | ||
1542 | case E_AVR_MACH_XMEGA4: | |
1543 | e_set = bfd_mach_avrxmega4; | |
1544 | break; | |
1545 | ||
1546 | case E_AVR_MACH_XMEGA5: | |
1547 | e_set = bfd_mach_avrxmega5; | |
1548 | break; | |
1549 | ||
1550 | case E_AVR_MACH_XMEGA6: | |
1551 | e_set = bfd_mach_avrxmega6; | |
1552 | break; | |
1553 | ||
1554 | case E_AVR_MACH_XMEGA7: | |
1555 | e_set = bfd_mach_avrxmega7; | |
1556 | break; | |
f36e8886 BS |
1557 | |
1558 | case E_AVR_MACH_AVRTINY: | |
1559 | e_set = bfd_mach_avrtiny; | |
1560 | break; | |
adde6300 AM |
1561 | } |
1562 | } | |
1563 | return bfd_default_set_arch_mach (abfd, bfd_arch_avr, | |
1564 | e_set); | |
1565 | } | |
1566 | ||
e4ef1b6c DC |
1567 | /* Returns whether the relocation type passed is a diff reloc. */ |
1568 | ||
1569 | static bfd_boolean | |
1570 | elf32_avr_is_diff_reloc (Elf_Internal_Rela *irel) | |
1571 | { | |
1572 | return (ELF32_R_TYPE (irel->r_info) == R_AVR_DIFF8 | |
1573 | ||ELF32_R_TYPE (irel->r_info) == R_AVR_DIFF16 | |
1574 | || ELF32_R_TYPE (irel->r_info) == R_AVR_DIFF32); | |
1575 | } | |
1576 | ||
f36e8886 BS |
1577 | /* Reduce the diff value written in the section by count if the shrinked |
1578 | insn address happens to fall between the two symbols for which this | |
1579 | diff reloc was emitted. */ | |
e4ef1b6c DC |
1580 | |
1581 | static void | |
1582 | elf32_avr_adjust_diff_reloc_value (bfd *abfd, | |
1583 | struct bfd_section *isec, | |
1584 | Elf_Internal_Rela *irel, | |
1585 | bfd_vma symval, | |
1586 | bfd_vma shrinked_insn_address, | |
1587 | int count) | |
1588 | { | |
1589 | unsigned char *reloc_contents = NULL; | |
1590 | unsigned char *isec_contents = elf_section_data (isec)->this_hdr.contents; | |
1591 | if (isec_contents == NULL) | |
1592 | { | |
1593 | if (! bfd_malloc_and_get_section (abfd, isec, &isec_contents)) | |
1594 | return; | |
1595 | ||
1596 | elf_section_data (isec)->this_hdr.contents = isec_contents; | |
1597 | } | |
1598 | ||
1599 | reloc_contents = isec_contents + irel->r_offset; | |
1600 | ||
1601 | /* Read value written in object file. */ | |
1602 | bfd_vma x = 0; | |
1603 | switch (ELF32_R_TYPE (irel->r_info)) | |
1604 | { | |
1605 | case R_AVR_DIFF8: | |
1606 | { | |
1607 | x = *reloc_contents; | |
1608 | break; | |
1609 | } | |
1610 | case R_AVR_DIFF16: | |
1611 | { | |
1612 | x = bfd_get_16 (abfd, reloc_contents); | |
1613 | break; | |
1614 | } | |
1615 | case R_AVR_DIFF32: | |
1616 | { | |
1617 | x = bfd_get_32 (abfd, reloc_contents); | |
1618 | break; | |
1619 | } | |
1620 | default: | |
1621 | { | |
1622 | BFD_FAIL(); | |
1623 | } | |
1624 | } | |
1625 | ||
1626 | /* For a diff reloc sym1 - sym2 the diff at assembly time (x) is written | |
1627 | into the object file at the reloc offset. sym2's logical value is | |
1628 | symval (<start_of_section>) + reloc addend. Compute the start and end | |
1629 | addresses and check if the shrinked insn falls between sym1 and sym2. */ | |
1630 | ||
1631 | bfd_vma end_address = symval + irel->r_addend; | |
1632 | bfd_vma start_address = end_address - x; | |
1633 | ||
f36e8886 | 1634 | /* Reduce the diff value by count bytes and write it back into section |
e4ef1b6c DC |
1635 | contents. */ |
1636 | ||
f36e8886 BS |
1637 | if (shrinked_insn_address >= start_address |
1638 | && shrinked_insn_address <= end_address) | |
e4ef1b6c DC |
1639 | { |
1640 | switch (ELF32_R_TYPE (irel->r_info)) | |
1641 | { | |
1642 | case R_AVR_DIFF8: | |
1643 | { | |
1644 | *reloc_contents = (x - count); | |
1645 | break; | |
1646 | } | |
1647 | case R_AVR_DIFF16: | |
1648 | { | |
1649 | bfd_put_16 (abfd, (x - count) & 0xFFFF, reloc_contents); | |
1650 | break; | |
1651 | } | |
1652 | case R_AVR_DIFF32: | |
1653 | { | |
1654 | bfd_put_32 (abfd, (x - count) & 0xFFFFFFFF, reloc_contents); | |
1655 | break; | |
1656 | } | |
1657 | default: | |
1658 | { | |
1659 | BFD_FAIL(); | |
1660 | } | |
1661 | } | |
1662 | ||
1663 | } | |
1664 | } | |
df406460 | 1665 | |
4cdc7696 NC |
1666 | /* Delete some bytes from a section while changing the size of an instruction. |
1667 | The parameter "addr" denotes the section-relative offset pointing just | |
1668 | behind the shrinked instruction. "addr+count" point at the first | |
1669 | byte just behind the original unshrinked instruction. */ | |
1670 | ||
1671 | static bfd_boolean | |
1672 | elf32_avr_relax_delete_bytes (bfd *abfd, | |
73160847 | 1673 | asection *sec, |
4cdc7696 | 1674 | bfd_vma addr, |
73160847 | 1675 | int count) |
4cdc7696 NC |
1676 | { |
1677 | Elf_Internal_Shdr *symtab_hdr; | |
1678 | unsigned int sec_shndx; | |
1679 | bfd_byte *contents; | |
1680 | Elf_Internal_Rela *irel, *irelend; | |
4cdc7696 NC |
1681 | Elf_Internal_Sym *isym; |
1682 | Elf_Internal_Sym *isymbuf = NULL; | |
4cdc7696 NC |
1683 | bfd_vma toaddr; |
1684 | struct elf_link_hash_entry **sym_hashes; | |
1685 | struct elf_link_hash_entry **end_hashes; | |
1686 | unsigned int symcount; | |
1687 | ||
1688 | symtab_hdr = &elf_tdata (abfd)->symtab_hdr; | |
1689 | sec_shndx = _bfd_elf_section_from_bfd_section (abfd, sec); | |
1690 | contents = elf_section_data (sec)->this_hdr.contents; | |
1691 | ||
4cdc7696 NC |
1692 | toaddr = sec->size; |
1693 | ||
1694 | irel = elf_section_data (sec)->relocs; | |
1695 | irelend = irel + sec->reloc_count; | |
1696 | ||
1697 | /* Actually delete the bytes. */ | |
1698 | if (toaddr - addr - count > 0) | |
1699 | memmove (contents + addr, contents + addr + count, | |
1700 | (size_t) (toaddr - addr - count)); | |
1701 | sec->size -= count; | |
1702 | ||
73160847 | 1703 | /* Adjust all the reloc addresses. */ |
4cdc7696 NC |
1704 | for (irel = elf_section_data (sec)->relocs; irel < irelend; irel++) |
1705 | { | |
4cdc7696 | 1706 | bfd_vma old_reloc_address; |
4cdc7696 NC |
1707 | |
1708 | old_reloc_address = (sec->output_section->vma | |
1709 | + sec->output_offset + irel->r_offset); | |
4cdc7696 NC |
1710 | |
1711 | /* Get the new reloc address. */ | |
1712 | if ((irel->r_offset > addr | |
1713 | && irel->r_offset < toaddr)) | |
1714 | { | |
28c9d252 | 1715 | if (debug_relax) |
4cdc7696 NC |
1716 | printf ("Relocation at address 0x%x needs to be moved.\n" |
1717 | "Old section offset: 0x%x, New section offset: 0x%x \n", | |
1718 | (unsigned int) old_reloc_address, | |
1719 | (unsigned int) irel->r_offset, | |
1720 | (unsigned int) ((irel->r_offset) - count)); | |
1721 | ||
1722 | irel->r_offset -= count; | |
1723 | } | |
1724 | ||
73160847 | 1725 | } |
4cdc7696 | 1726 | |
73160847 NC |
1727 | /* The reloc's own addresses are now ok. However, we need to readjust |
1728 | the reloc's addend, i.e. the reloc's value if two conditions are met: | |
1729 | 1.) the reloc is relative to a symbol in this section that | |
1730 | is located in front of the shrinked instruction | |
28c9d252 NC |
1731 | 2.) symbol plus addend end up behind the shrinked instruction. |
1732 | ||
73160847 NC |
1733 | The most common case where this happens are relocs relative to |
1734 | the section-start symbol. | |
28c9d252 | 1735 | |
73160847 NC |
1736 | This step needs to be done for all of the sections of the bfd. */ |
1737 | ||
1738 | { | |
1739 | struct bfd_section *isec; | |
1740 | ||
1741 | for (isec = abfd->sections; isec; isec = isec->next) | |
1742 | { | |
1743 | bfd_vma symval; | |
1744 | bfd_vma shrinked_insn_address; | |
1745 | ||
a1c7aafb NC |
1746 | if (isec->reloc_count == 0) |
1747 | continue; | |
1748 | ||
73160847 NC |
1749 | shrinked_insn_address = (sec->output_section->vma |
1750 | + sec->output_offset + addr - count); | |
1751 | ||
a1c7aafb NC |
1752 | irel = elf_section_data (isec)->relocs; |
1753 | /* PR 12161: Read in the relocs for this section if necessary. */ | |
1754 | if (irel == NULL) | |
6aa82b64 | 1755 | irel = _bfd_elf_link_read_relocs (abfd, isec, NULL, NULL, TRUE); |
a1c7aafb NC |
1756 | |
1757 | for (irelend = irel + isec->reloc_count; | |
73160847 NC |
1758 | irel < irelend; |
1759 | irel++) | |
1760 | { | |
28c9d252 | 1761 | /* Read this BFD's local symbols if we haven't done |
73160847 NC |
1762 | so already. */ |
1763 | if (isymbuf == NULL && symtab_hdr->sh_info != 0) | |
1764 | { | |
1765 | isymbuf = (Elf_Internal_Sym *) symtab_hdr->contents; | |
1766 | if (isymbuf == NULL) | |
1767 | isymbuf = bfd_elf_get_elf_syms (abfd, symtab_hdr, | |
1768 | symtab_hdr->sh_info, 0, | |
1769 | NULL, NULL, NULL); | |
1770 | if (isymbuf == NULL) | |
1771 | return FALSE; | |
1772 | } | |
1773 | ||
1774 | /* Get the value of the symbol referred to by the reloc. */ | |
1775 | if (ELF32_R_SYM (irel->r_info) < symtab_hdr->sh_info) | |
1776 | { | |
1777 | /* A local symbol. */ | |
73160847 NC |
1778 | asection *sym_sec; |
1779 | ||
1780 | isym = isymbuf + ELF32_R_SYM (irel->r_info); | |
1781 | sym_sec = bfd_section_from_elf_index (abfd, isym->st_shndx); | |
1782 | symval = isym->st_value; | |
1783 | /* If the reloc is absolute, it will not have | |
1784 | a symbol or section associated with it. */ | |
1785 | if (sym_sec == sec) | |
28c9d252 | 1786 | { |
73160847 NC |
1787 | symval += sym_sec->output_section->vma |
1788 | + sym_sec->output_offset; | |
4cdc7696 | 1789 | |
28c9d252 | 1790 | if (debug_relax) |
73160847 NC |
1791 | printf ("Checking if the relocation's " |
1792 | "addend needs corrections.\n" | |
1793 | "Address of anchor symbol: 0x%x \n" | |
1794 | "Address of relocation target: 0x%x \n" | |
1795 | "Address of relaxed insn: 0x%x \n", | |
1796 | (unsigned int) symval, | |
1797 | (unsigned int) (symval + irel->r_addend), | |
1798 | (unsigned int) shrinked_insn_address); | |
1799 | ||
1800 | if (symval <= shrinked_insn_address | |
1801 | && (symval + irel->r_addend) > shrinked_insn_address) | |
1802 | { | |
e4ef1b6c DC |
1803 | if (elf32_avr_is_diff_reloc (irel)) |
1804 | { | |
1805 | elf32_avr_adjust_diff_reloc_value (abfd, isec, irel, | |
1806 | symval, | |
1807 | shrinked_insn_address, | |
1808 | count); | |
1809 | } | |
1810 | ||
73160847 NC |
1811 | irel->r_addend -= count; |
1812 | ||
28c9d252 | 1813 | if (debug_relax) |
73160847 NC |
1814 | printf ("Relocation's addend needed to be fixed \n"); |
1815 | } | |
4cdc7696 | 1816 | } |
73160847 | 1817 | /* else...Reference symbol is absolute. No adjustment needed. */ |
28c9d252 NC |
1818 | } |
1819 | /* else...Reference symbol is extern. No need for adjusting | |
73160847 | 1820 | the addend. */ |
28c9d252 | 1821 | } |
73160847 NC |
1822 | } |
1823 | } | |
4cdc7696 NC |
1824 | |
1825 | /* Adjust the local symbols defined in this section. */ | |
1826 | isym = (Elf_Internal_Sym *) symtab_hdr->contents; | |
12123067 NC |
1827 | /* Fix PR 9841, there may be no local symbols. */ |
1828 | if (isym != NULL) | |
4cdc7696 | 1829 | { |
12123067 NC |
1830 | Elf_Internal_Sym *isymend; |
1831 | ||
1832 | isymend = isym + symtab_hdr->sh_info; | |
1833 | for (; isym < isymend; isym++) | |
1834 | { | |
1835 | if (isym->st_shndx == sec_shndx | |
1836 | && isym->st_value > addr | |
1837 | && isym->st_value < toaddr) | |
1838 | isym->st_value -= count; | |
1839 | } | |
4cdc7696 NC |
1840 | } |
1841 | ||
1842 | /* Now adjust the global symbols defined in this section. */ | |
1843 | symcount = (symtab_hdr->sh_size / sizeof (Elf32_External_Sym) | |
1844 | - symtab_hdr->sh_info); | |
1845 | sym_hashes = elf_sym_hashes (abfd); | |
1846 | end_hashes = sym_hashes + symcount; | |
1847 | for (; sym_hashes < end_hashes; sym_hashes++) | |
1848 | { | |
1849 | struct elf_link_hash_entry *sym_hash = *sym_hashes; | |
1850 | if ((sym_hash->root.type == bfd_link_hash_defined | |
1851 | || sym_hash->root.type == bfd_link_hash_defweak) | |
1852 | && sym_hash->root.u.def.section == sec | |
1853 | && sym_hash->root.u.def.value > addr | |
1854 | && sym_hash->root.u.def.value < toaddr) | |
1855 | { | |
1856 | sym_hash->root.u.def.value -= count; | |
1857 | } | |
1858 | } | |
1859 | ||
1860 | return TRUE; | |
1861 | } | |
1862 | ||
df406460 NC |
1863 | /* This function handles relaxing for the avr. |
1864 | Many important relaxing opportunities within functions are already | |
1865 | realized by the compiler itself. | |
1866 | Here we try to replace call (4 bytes) -> rcall (2 bytes) | |
4cdc7696 NC |
1867 | and jump -> rjmp (safes also 2 bytes). |
1868 | As well we now optimize seqences of | |
df406460 NC |
1869 | - call/rcall function |
1870 | - ret | |
1871 | to yield | |
1872 | - jmp/rjmp function | |
1873 | - ret | |
1874 | . In case that within a sequence | |
1875 | - jmp/rjmp label | |
1876 | - ret | |
1877 | the ret could no longer be reached it is optimized away. In order | |
1878 | to check if the ret is no longer needed, it is checked that the ret's address | |
1879 | is not the target of a branch or jump within the same section, it is checked | |
1880 | that there is no skip instruction before the jmp/rjmp and that there | |
1881 | is no local or global label place at the address of the ret. | |
4cdc7696 | 1882 | |
df406460 | 1883 | We refrain from relaxing within sections ".vectors" and |
4cdc7696 | 1884 | ".jumptables" in order to maintain the position of the instructions. |
df406460 | 1885 | There, however, we substitute jmp/call by a sequence rjmp,nop/rcall,nop |
4cdc7696 | 1886 | if possible. (In future one could possibly use the space of the nop |
df406460 NC |
1887 | for the first instruction of the irq service function. |
1888 | ||
1889 | The .jumptables sections is meant to be used for a future tablejump variant | |
1890 | for the devices with 3-byte program counter where the table itself | |
4cdc7696 | 1891 | contains 4-byte jump instructions whose relative offset must not |
df406460 | 1892 | be changed. */ |
4cdc7696 | 1893 | |
28c9d252 | 1894 | static bfd_boolean |
4cdc7696 NC |
1895 | elf32_avr_relax_section (bfd *abfd, |
1896 | asection *sec, | |
df406460 NC |
1897 | struct bfd_link_info *link_info, |
1898 | bfd_boolean *again) | |
1899 | { | |
1900 | Elf_Internal_Shdr *symtab_hdr; | |
1901 | Elf_Internal_Rela *internal_relocs; | |
1902 | Elf_Internal_Rela *irel, *irelend; | |
1903 | bfd_byte *contents = NULL; | |
1904 | Elf_Internal_Sym *isymbuf = NULL; | |
28c9d252 NC |
1905 | struct elf32_avr_link_hash_table *htab; |
1906 | ||
526f25b2 | 1907 | /* If 'shrinkable' is FALSE, do not shrink by deleting bytes while |
68ffbac6 L |
1908 | relaxing. Such shrinking can cause issues for the sections such |
1909 | as .vectors and .jumptables. Instead the unused bytes should be | |
526f25b2 EW |
1910 | filled with nop instructions. */ |
1911 | bfd_boolean shrinkable = TRUE; | |
1912 | ||
1913 | if (!strcmp (sec->name,".vectors") | |
1914 | || !strcmp (sec->name,".jumptables")) | |
1915 | shrinkable = FALSE; | |
1916 | ||
c8a1f254 NS |
1917 | if (link_info->relocatable) |
1918 | (*link_info->callbacks->einfo) | |
1919 | (_("%P%F: --relax and -r may not be used together\n")); | |
1920 | ||
28c9d252 | 1921 | htab = avr_link_hash_table (link_info); |
64ee10b6 NC |
1922 | if (htab == NULL) |
1923 | return FALSE; | |
df406460 NC |
1924 | |
1925 | /* Assume nothing changes. */ | |
1926 | *again = FALSE; | |
1927 | ||
28c9d252 NC |
1928 | if ((!htab->no_stubs) && (sec == htab->stub_sec)) |
1929 | { | |
1930 | /* We are just relaxing the stub section. | |
1931 | Let's calculate the size needed again. */ | |
1932 | bfd_size_type last_estimated_stub_section_size = htab->stub_sec->size; | |
1933 | ||
1934 | if (debug_relax) | |
1935 | printf ("Relaxing the stub section. Size prior to this pass: %i\n", | |
1936 | (int) last_estimated_stub_section_size); | |
1937 | ||
1938 | elf32_avr_size_stubs (htab->stub_sec->output_section->owner, | |
1939 | link_info, FALSE); | |
1940 | ||
1941 | /* Check if the number of trampolines changed. */ | |
1942 | if (last_estimated_stub_section_size != htab->stub_sec->size) | |
1943 | *again = TRUE; | |
1944 | ||
1945 | if (debug_relax) | |
1946 | printf ("Size of stub section after this pass: %i\n", | |
1947 | (int) htab->stub_sec->size); | |
1948 | ||
1949 | return TRUE; | |
1950 | } | |
1951 | ||
df406460 NC |
1952 | /* We don't have to do anything for a relocatable link, if |
1953 | this section does not have relocs, or if this is not a | |
1954 | code section. */ | |
1955 | if (link_info->relocatable | |
1956 | || (sec->flags & SEC_RELOC) == 0 | |
1957 | || sec->reloc_count == 0 | |
1958 | || (sec->flags & SEC_CODE) == 0) | |
1959 | return TRUE; | |
4cdc7696 | 1960 | |
df406460 NC |
1961 | /* Check if the object file to relax uses internal symbols so that we |
1962 | could fix up the relocations. */ | |
df406460 NC |
1963 | if (!(elf_elfheader (abfd)->e_flags & EF_AVR_LINKRELAX_PREPARED)) |
1964 | return TRUE; | |
df406460 NC |
1965 | |
1966 | symtab_hdr = &elf_tdata (abfd)->symtab_hdr; | |
1967 | ||
1968 | /* Get a copy of the native relocations. */ | |
1969 | internal_relocs = (_bfd_elf_link_read_relocs | |
4cdc7696 | 1970 | (abfd, sec, NULL, NULL, link_info->keep_memory)); |
df406460 NC |
1971 | if (internal_relocs == NULL) |
1972 | goto error_return; | |
1973 | ||
df406460 NC |
1974 | /* Walk through the relocs looking for relaxing opportunities. */ |
1975 | irelend = internal_relocs + sec->reloc_count; | |
1976 | for (irel = internal_relocs; irel < irelend; irel++) | |
1977 | { | |
1978 | bfd_vma symval; | |
1979 | ||
4cdc7696 | 1980 | if ( ELF32_R_TYPE (irel->r_info) != R_AVR_13_PCREL |
f36e8886 BS |
1981 | && ELF32_R_TYPE (irel->r_info) != R_AVR_7_PCREL |
1982 | && ELF32_R_TYPE (irel->r_info) != R_AVR_CALL) | |
df406460 | 1983 | continue; |
4cdc7696 | 1984 | |
df406460 NC |
1985 | /* Get the section contents if we haven't done so already. */ |
1986 | if (contents == NULL) | |
1987 | { | |
1988 | /* Get cached copy if it exists. */ | |
1989 | if (elf_section_data (sec)->this_hdr.contents != NULL) | |
1990 | contents = elf_section_data (sec)->this_hdr.contents; | |
1991 | else | |
1992 | { | |
1993 | /* Go get them off disk. */ | |
4cdc7696 | 1994 | if (! bfd_malloc_and_get_section (abfd, sec, &contents)) |
df406460 NC |
1995 | goto error_return; |
1996 | } | |
1997 | } | |
1998 | ||
91d6fa6a | 1999 | /* Read this BFD's local symbols if we haven't done so already. */ |
df406460 NC |
2000 | if (isymbuf == NULL && symtab_hdr->sh_info != 0) |
2001 | { | |
2002 | isymbuf = (Elf_Internal_Sym *) symtab_hdr->contents; | |
2003 | if (isymbuf == NULL) | |
2004 | isymbuf = bfd_elf_get_elf_syms (abfd, symtab_hdr, | |
2005 | symtab_hdr->sh_info, 0, | |
2006 | NULL, NULL, NULL); | |
2007 | if (isymbuf == NULL) | |
2008 | goto error_return; | |
2009 | } | |
2010 | ||
2011 | ||
2012 | /* Get the value of the symbol referred to by the reloc. */ | |
2013 | if (ELF32_R_SYM (irel->r_info) < symtab_hdr->sh_info) | |
2014 | { | |
2015 | /* A local symbol. */ | |
2016 | Elf_Internal_Sym *isym; | |
2017 | asection *sym_sec; | |
2018 | ||
2019 | isym = isymbuf + ELF32_R_SYM (irel->r_info); | |
2020 | sym_sec = bfd_section_from_elf_index (abfd, isym->st_shndx); | |
2021 | symval = isym->st_value; | |
2022 | /* If the reloc is absolute, it will not have | |
2023 | a symbol or section associated with it. */ | |
2024 | if (sym_sec) | |
2025 | symval += sym_sec->output_section->vma | |
2026 | + sym_sec->output_offset; | |
2027 | } | |
2028 | else | |
2029 | { | |
2030 | unsigned long indx; | |
2031 | struct elf_link_hash_entry *h; | |
2032 | ||
2033 | /* An external symbol. */ | |
2034 | indx = ELF32_R_SYM (irel->r_info) - symtab_hdr->sh_info; | |
2035 | h = elf_sym_hashes (abfd)[indx]; | |
2036 | BFD_ASSERT (h != NULL); | |
2037 | if (h->root.type != bfd_link_hash_defined | |
2038 | && h->root.type != bfd_link_hash_defweak) | |
4cdc7696 NC |
2039 | /* This appears to be a reference to an undefined |
2040 | symbol. Just ignore it--it will be caught by the | |
2041 | regular reloc processing. */ | |
2042 | continue; | |
2043 | ||
df406460 NC |
2044 | symval = (h->root.u.def.value |
2045 | + h->root.u.def.section->output_section->vma | |
2046 | + h->root.u.def.section->output_offset); | |
2047 | } | |
2048 | ||
2049 | /* For simplicity of coding, we are going to modify the section | |
2050 | contents, the section relocs, and the BFD symbol table. We | |
2051 | must tell the rest of the code not to free up this | |
2052 | information. It would be possible to instead create a table | |
2053 | of changes which have to be made, as is done in coff-mips.c; | |
2054 | that would be more work, but would require less memory when | |
2055 | the linker is run. */ | |
2056 | switch (ELF32_R_TYPE (irel->r_info)) | |
2057 | { | |
91d6fa6a NC |
2058 | /* Try to turn a 22-bit absolute call/jump into an 13-bit |
2059 | pc-relative rcall/rjmp. */ | |
2060 | case R_AVR_CALL: | |
df406460 NC |
2061 | { |
2062 | bfd_vma value = symval + irel->r_addend; | |
2063 | bfd_vma dot, gap; | |
2064 | int distance_short_enough = 0; | |
2065 | ||
2066 | /* Get the address of this instruction. */ | |
2067 | dot = (sec->output_section->vma | |
2068 | + sec->output_offset + irel->r_offset); | |
2069 | ||
2070 | /* Compute the distance from this insn to the branch target. */ | |
2071 | gap = value - dot; | |
2072 | ||
526f25b2 EW |
2073 | /* Check if the gap falls in the range that can be accommodated |
2074 | in 13bits signed (It is 12bits when encoded, as we deal with | |
2075 | word addressing). */ | |
2076 | if (!shrinkable && ((int) gap >= -4096 && (int) gap <= 4095)) | |
2077 | distance_short_enough = 1; | |
2078 | /* If shrinkable, then we can check for a range of distance which | |
2079 | is two bytes farther on both the directions because the call | |
68ffbac6 | 2080 | or jump target will be closer by two bytes after the |
526f25b2 EW |
2081 | relaxation. */ |
2082 | else if (shrinkable && ((int) gap >= -4094 && (int) gap <= 4097)) | |
df406460 NC |
2083 | distance_short_enough = 1; |
2084 | ||
2085 | /* Here we handle the wrap-around case. E.g. for a 16k device | |
4cdc7696 | 2086 | we could use a rjmp to jump from address 0x100 to 0x3d00! |
df406460 NC |
2087 | In order to make this work properly, we need to fill the |
2088 | vaiable avr_pc_wrap_around with the appropriate value. | |
2089 | I.e. 0x4000 for a 16k device. */ | |
2090 | { | |
91d6fa6a NC |
2091 | /* Shrinking the code size makes the gaps larger in the |
2092 | case of wrap-arounds. So we use a heuristical safety | |
2093 | margin to avoid that during relax the distance gets | |
2094 | again too large for the short jumps. Let's assume | |
2095 | a typical code-size reduction due to relax for a | |
2096 | 16k device of 600 bytes. So let's use twice the | |
2097 | typical value as safety margin. */ | |
2098 | int rgap; | |
2099 | int safety_margin; | |
2100 | ||
2101 | int assumed_shrink = 600; | |
2102 | if (avr_pc_wrap_around > 0x4000) | |
2103 | assumed_shrink = 900; | |
2104 | ||
2105 | safety_margin = 2 * assumed_shrink; | |
2106 | ||
2107 | rgap = avr_relative_distance_considering_wrap_around (gap); | |
2108 | ||
2109 | if (rgap >= (-4092 + safety_margin) | |
2110 | && rgap <= (4094 - safety_margin)) | |
2111 | distance_short_enough = 1; | |
4cdc7696 | 2112 | } |
df406460 NC |
2113 | |
2114 | if (distance_short_enough) | |
2115 | { | |
2116 | unsigned char code_msb; | |
2117 | unsigned char code_lsb; | |
2118 | ||
28c9d252 | 2119 | if (debug_relax) |
df406460 NC |
2120 | printf ("shrinking jump/call instruction at address 0x%x" |
2121 | " in section %s\n\n", | |
2122 | (int) dot, sec->name); | |
2123 | ||
2124 | /* Note that we've changed the relocs, section contents, | |
2125 | etc. */ | |
2126 | elf_section_data (sec)->relocs = internal_relocs; | |
2127 | elf_section_data (sec)->this_hdr.contents = contents; | |
2128 | symtab_hdr->contents = (unsigned char *) isymbuf; | |
2129 | ||
2130 | /* Get the instruction code for relaxing. */ | |
2131 | code_lsb = bfd_get_8 (abfd, contents + irel->r_offset); | |
2132 | code_msb = bfd_get_8 (abfd, contents + irel->r_offset + 1); | |
2133 | ||
2134 | /* Mask out the relocation bits. */ | |
2135 | code_msb &= 0x94; | |
2136 | code_lsb &= 0x0E; | |
2137 | if (code_msb == 0x94 && code_lsb == 0x0E) | |
2138 | { | |
2139 | /* we are changing call -> rcall . */ | |
2140 | bfd_put_8 (abfd, 0x00, contents + irel->r_offset); | |
2141 | bfd_put_8 (abfd, 0xD0, contents + irel->r_offset + 1); | |
2142 | } | |
2143 | else if (code_msb == 0x94 && code_lsb == 0x0C) | |
2144 | { | |
2145 | /* we are changeing jump -> rjmp. */ | |
2146 | bfd_put_8 (abfd, 0x00, contents + irel->r_offset); | |
2147 | bfd_put_8 (abfd, 0xC0, contents + irel->r_offset + 1); | |
2148 | } | |
4cdc7696 | 2149 | else |
df406460 NC |
2150 | abort (); |
2151 | ||
2152 | /* Fix the relocation's type. */ | |
2153 | irel->r_info = ELF32_R_INFO (ELF32_R_SYM (irel->r_info), | |
2154 | R_AVR_13_PCREL); | |
2155 | ||
526f25b2 | 2156 | /* We should not modify the ordering if 'shrinkable' is |
68ffbac6 | 2157 | FALSE. */ |
526f25b2 | 2158 | if (!shrinkable) |
df406460 NC |
2159 | { |
2160 | /* Let's insert a nop. */ | |
2161 | bfd_put_8 (abfd, 0x00, contents + irel->r_offset + 2); | |
2162 | bfd_put_8 (abfd, 0x00, contents + irel->r_offset + 3); | |
2163 | } | |
2164 | else | |
2165 | { | |
2166 | /* Delete two bytes of data. */ | |
2167 | if (!elf32_avr_relax_delete_bytes (abfd, sec, | |
2168 | irel->r_offset + 2, 2)) | |
2169 | goto error_return; | |
2170 | ||
2171 | /* That will change things, so, we should relax again. | |
2172 | Note that this is not required, and it may be slow. */ | |
2173 | *again = TRUE; | |
2174 | } | |
2175 | } | |
2176 | } | |
4cdc7696 | 2177 | |
df406460 NC |
2178 | default: |
2179 | { | |
2180 | unsigned char code_msb; | |
2181 | unsigned char code_lsb; | |
2182 | bfd_vma dot; | |
2183 | ||
2184 | code_msb = bfd_get_8 (abfd, contents + irel->r_offset + 1); | |
2185 | code_lsb = bfd_get_8 (abfd, contents + irel->r_offset + 0); | |
2186 | ||
2187 | /* Get the address of this instruction. */ | |
2188 | dot = (sec->output_section->vma | |
2189 | + sec->output_offset + irel->r_offset); | |
4cdc7696 NC |
2190 | |
2191 | /* Here we look for rcall/ret or call/ret sequences that could be | |
28c9d252 NC |
2192 | safely replaced by rjmp/ret or jmp/ret. */ |
2193 | if (((code_msb & 0xf0) == 0xd0) | |
2194 | && avr_replace_call_ret_sequences) | |
df406460 NC |
2195 | { |
2196 | /* This insn is a rcall. */ | |
2197 | unsigned char next_insn_msb = 0; | |
2198 | unsigned char next_insn_lsb = 0; | |
2199 | ||
2200 | if (irel->r_offset + 3 < sec->size) | |
2201 | { | |
4cdc7696 | 2202 | next_insn_msb = |
91d6fa6a | 2203 | bfd_get_8 (abfd, contents + irel->r_offset + 3); |
4cdc7696 | 2204 | next_insn_lsb = |
91d6fa6a | 2205 | bfd_get_8 (abfd, contents + irel->r_offset + 2); |
df406460 | 2206 | } |
4cdc7696 NC |
2207 | |
2208 | if ((0x95 == next_insn_msb) && (0x08 == next_insn_lsb)) | |
df406460 NC |
2209 | { |
2210 | /* The next insn is a ret. We now convert the rcall insn | |
2211 | into a rjmp instruction. */ | |
df406460 NC |
2212 | code_msb &= 0xef; |
2213 | bfd_put_8 (abfd, code_msb, contents + irel->r_offset + 1); | |
28c9d252 | 2214 | if (debug_relax) |
df406460 NC |
2215 | printf ("converted rcall/ret sequence at address 0x%x" |
2216 | " into rjmp/ret sequence. Section is %s\n\n", | |
2217 | (int) dot, sec->name); | |
2218 | *again = TRUE; | |
2219 | break; | |
2220 | } | |
2221 | } | |
2222 | else if ((0x94 == (code_msb & 0xfe)) | |
28c9d252 NC |
2223 | && (0x0e == (code_lsb & 0x0e)) |
2224 | && avr_replace_call_ret_sequences) | |
df406460 NC |
2225 | { |
2226 | /* This insn is a call. */ | |
2227 | unsigned char next_insn_msb = 0; | |
2228 | unsigned char next_insn_lsb = 0; | |
2229 | ||
2230 | if (irel->r_offset + 5 < sec->size) | |
2231 | { | |
2232 | next_insn_msb = | |
91d6fa6a | 2233 | bfd_get_8 (abfd, contents + irel->r_offset + 5); |
df406460 | 2234 | next_insn_lsb = |
91d6fa6a | 2235 | bfd_get_8 (abfd, contents + irel->r_offset + 4); |
df406460 | 2236 | } |
4cdc7696 | 2237 | |
df406460 NC |
2238 | if ((0x95 == next_insn_msb) && (0x08 == next_insn_lsb)) |
2239 | { | |
2240 | /* The next insn is a ret. We now convert the call insn | |
2241 | into a jmp instruction. */ | |
2242 | ||
2243 | code_lsb &= 0xfd; | |
2244 | bfd_put_8 (abfd, code_lsb, contents + irel->r_offset); | |
28c9d252 | 2245 | if (debug_relax) |
df406460 NC |
2246 | printf ("converted call/ret sequence at address 0x%x" |
2247 | " into jmp/ret sequence. Section is %s\n\n", | |
2248 | (int) dot, sec->name); | |
2249 | *again = TRUE; | |
2250 | break; | |
2251 | } | |
2252 | } | |
4cdc7696 NC |
2253 | else if ((0xc0 == (code_msb & 0xf0)) |
2254 | || ((0x94 == (code_msb & 0xfe)) | |
df406460 NC |
2255 | && (0x0c == (code_lsb & 0x0e)))) |
2256 | { | |
4cdc7696 | 2257 | /* This insn is a rjmp or a jmp. */ |
df406460 NC |
2258 | unsigned char next_insn_msb = 0; |
2259 | unsigned char next_insn_lsb = 0; | |
2260 | int insn_size; | |
2261 | ||
2262 | if (0xc0 == (code_msb & 0xf0)) | |
2263 | insn_size = 2; /* rjmp insn */ | |
2264 | else | |
2265 | insn_size = 4; /* jmp insn */ | |
2266 | ||
2267 | if (irel->r_offset + insn_size + 1 < sec->size) | |
2268 | { | |
4cdc7696 | 2269 | next_insn_msb = |
91d6fa6a NC |
2270 | bfd_get_8 (abfd, contents + irel->r_offset |
2271 | + insn_size + 1); | |
4cdc7696 | 2272 | next_insn_lsb = |
91d6fa6a NC |
2273 | bfd_get_8 (abfd, contents + irel->r_offset |
2274 | + insn_size); | |
df406460 NC |
2275 | } |
2276 | ||
2277 | if ((0x95 == next_insn_msb) && (0x08 == next_insn_lsb)) | |
2278 | { | |
2279 | /* The next insn is a ret. We possibly could delete | |
cc643b88 | 2280 | this ret. First we need to check for preceding |
df406460 NC |
2281 | sbis/sbic/sbrs or cpse "skip" instructions. */ |
2282 | ||
cc643b88 | 2283 | int there_is_preceding_non_skip_insn = 1; |
df406460 NC |
2284 | bfd_vma address_of_ret; |
2285 | ||
2286 | address_of_ret = dot + insn_size; | |
2287 | ||
28c9d252 | 2288 | if (debug_relax && (insn_size == 2)) |
4cdc7696 | 2289 | printf ("found rjmp / ret sequence at address 0x%x\n", |
df406460 | 2290 | (int) dot); |
28c9d252 | 2291 | if (debug_relax && (insn_size == 4)) |
4cdc7696 | 2292 | printf ("found jmp / ret sequence at address 0x%x\n", |
df406460 NC |
2293 | (int) dot); |
2294 | ||
cc643b88 | 2295 | /* We have to make sure that there is a preceding insn. */ |
df406460 NC |
2296 | if (irel->r_offset >= 2) |
2297 | { | |
cc643b88 NC |
2298 | unsigned char preceding_msb; |
2299 | unsigned char preceding_lsb; | |
2300 | ||
2301 | preceding_msb = | |
91d6fa6a | 2302 | bfd_get_8 (abfd, contents + irel->r_offset - 1); |
cc643b88 | 2303 | preceding_lsb = |
91d6fa6a | 2304 | bfd_get_8 (abfd, contents + irel->r_offset - 2); |
df406460 NC |
2305 | |
2306 | /* sbic. */ | |
cc643b88 NC |
2307 | if (0x99 == preceding_msb) |
2308 | there_is_preceding_non_skip_insn = 0; | |
df406460 NC |
2309 | |
2310 | /* sbis. */ | |
cc643b88 NC |
2311 | if (0x9b == preceding_msb) |
2312 | there_is_preceding_non_skip_insn = 0; | |
df406460 NC |
2313 | |
2314 | /* sbrc */ | |
cc643b88 NC |
2315 | if ((0xfc == (preceding_msb & 0xfe) |
2316 | && (0x00 == (preceding_lsb & 0x08)))) | |
2317 | there_is_preceding_non_skip_insn = 0; | |
df406460 | 2318 | |
4cdc7696 | 2319 | /* sbrs */ |
cc643b88 NC |
2320 | if ((0xfe == (preceding_msb & 0xfe) |
2321 | && (0x00 == (preceding_lsb & 0x08)))) | |
2322 | there_is_preceding_non_skip_insn = 0; | |
4cdc7696 | 2323 | |
df406460 | 2324 | /* cpse */ |
cc643b88 NC |
2325 | if (0x10 == (preceding_msb & 0xfc)) |
2326 | there_is_preceding_non_skip_insn = 0; | |
4cdc7696 | 2327 | |
cc643b88 | 2328 | if (there_is_preceding_non_skip_insn == 0) |
28c9d252 | 2329 | if (debug_relax) |
cc643b88 NC |
2330 | printf ("preceding skip insn prevents deletion of" |
2331 | " ret insn at Addy 0x%x in section %s\n", | |
df406460 NC |
2332 | (int) dot + 2, sec->name); |
2333 | } | |
2334 | else | |
2335 | { | |
2336 | /* There is no previous instruction. */ | |
cc643b88 | 2337 | there_is_preceding_non_skip_insn = 0; |
4cdc7696 | 2338 | } |
df406460 | 2339 | |
cc643b88 | 2340 | if (there_is_preceding_non_skip_insn) |
df406460 NC |
2341 | { |
2342 | /* We now only have to make sure that there is no | |
2343 | local label defined at the address of the ret | |
2344 | instruction and that there is no local relocation | |
2345 | in this section pointing to the ret. */ | |
2346 | ||
2347 | int deleting_ret_is_safe = 1; | |
4cdc7696 | 2348 | unsigned int section_offset_of_ret_insn = |
91d6fa6a | 2349 | irel->r_offset + insn_size; |
df406460 NC |
2350 | Elf_Internal_Sym *isym, *isymend; |
2351 | unsigned int sec_shndx; | |
8d6a12ee | 2352 | struct bfd_section *isec; |
4cdc7696 NC |
2353 | |
2354 | sec_shndx = | |
2355 | _bfd_elf_section_from_bfd_section (abfd, sec); | |
df406460 NC |
2356 | |
2357 | /* Check for local symbols. */ | |
2358 | isym = (Elf_Internal_Sym *) symtab_hdr->contents; | |
2359 | isymend = isym + symtab_hdr->sh_info; | |
696b7ad2 NC |
2360 | /* PR 6019: There may not be any local symbols. */ |
2361 | for (; isym != NULL && isym < isymend; isym++) | |
91d6fa6a NC |
2362 | { |
2363 | if (isym->st_value == section_offset_of_ret_insn | |
2364 | && isym->st_shndx == sec_shndx) | |
2365 | { | |
2366 | deleting_ret_is_safe = 0; | |
2367 | if (debug_relax) | |
2368 | printf ("local label prevents deletion of ret " | |
2369 | "insn at address 0x%x\n", | |
2370 | (int) dot + insn_size); | |
2371 | } | |
2372 | } | |
2373 | ||
2374 | /* Now check for global symbols. */ | |
2375 | { | |
2376 | int symcount; | |
2377 | struct elf_link_hash_entry **sym_hashes; | |
2378 | struct elf_link_hash_entry **end_hashes; | |
2379 | ||
2380 | symcount = (symtab_hdr->sh_size | |
2381 | / sizeof (Elf32_External_Sym) | |
2382 | - symtab_hdr->sh_info); | |
2383 | sym_hashes = elf_sym_hashes (abfd); | |
2384 | end_hashes = sym_hashes + symcount; | |
2385 | for (; sym_hashes < end_hashes; sym_hashes++) | |
2386 | { | |
2387 | struct elf_link_hash_entry *sym_hash = | |
2388 | *sym_hashes; | |
2389 | if ((sym_hash->root.type == bfd_link_hash_defined | |
2390 | || sym_hash->root.type == | |
4cdc7696 | 2391 | bfd_link_hash_defweak) |
91d6fa6a NC |
2392 | && sym_hash->root.u.def.section == sec |
2393 | && sym_hash->root.u.def.value == section_offset_of_ret_insn) | |
2394 | { | |
2395 | deleting_ret_is_safe = 0; | |
2396 | if (debug_relax) | |
2397 | printf ("global label prevents deletion of " | |
2398 | "ret insn at address 0x%x\n", | |
2399 | (int) dot + insn_size); | |
2400 | } | |
2401 | } | |
2402 | } | |
91d6fa6a | 2403 | |
8d6a12ee NC |
2404 | /* Now we check for relocations pointing to ret. */ |
2405 | for (isec = abfd->sections; isec && deleting_ret_is_safe; isec = isec->next) | |
2406 | { | |
2407 | Elf_Internal_Rela *rel; | |
2408 | Elf_Internal_Rela *relend; | |
f36e8886 | 2409 | |
8d6a12ee NC |
2410 | rel = elf_section_data (isec)->relocs; |
2411 | if (rel == NULL) | |
2412 | rel = _bfd_elf_link_read_relocs (abfd, isec, NULL, NULL, TRUE); | |
91d6fa6a | 2413 | |
8d6a12ee | 2414 | relend = rel + isec->reloc_count; |
91d6fa6a | 2415 | |
8d6a12ee NC |
2416 | for (; rel && rel < relend; rel++) |
2417 | { | |
2418 | bfd_vma reloc_target = 0; | |
2419 | ||
2420 | /* Read this BFD's local symbols if we haven't | |
2421 | done so already. */ | |
2422 | if (isymbuf == NULL && symtab_hdr->sh_info != 0) | |
2423 | { | |
2424 | isymbuf = (Elf_Internal_Sym *) | |
2425 | symtab_hdr->contents; | |
2426 | if (isymbuf == NULL) | |
2427 | isymbuf = bfd_elf_get_elf_syms | |
2428 | (abfd, | |
2429 | symtab_hdr, | |
2430 | symtab_hdr->sh_info, 0, | |
2431 | NULL, NULL, NULL); | |
2432 | if (isymbuf == NULL) | |
2433 | break; | |
2434 | } | |
2435 | ||
2436 | /* Get the value of the symbol referred to | |
2437 | by the reloc. */ | |
2438 | if (ELF32_R_SYM (rel->r_info) | |
2439 | < symtab_hdr->sh_info) | |
2440 | { | |
2441 | /* A local symbol. */ | |
2442 | asection *sym_sec; | |
2443 | ||
2444 | isym = isymbuf | |
2445 | + ELF32_R_SYM (rel->r_info); | |
2446 | sym_sec = bfd_section_from_elf_index | |
2447 | (abfd, isym->st_shndx); | |
2448 | symval = isym->st_value; | |
2449 | ||
2450 | /* If the reloc is absolute, it will not | |
2451 | have a symbol or section associated | |
2452 | with it. */ | |
2453 | ||
2454 | if (sym_sec) | |
2455 | { | |
2456 | symval += | |
2457 | sym_sec->output_section->vma | |
2458 | + sym_sec->output_offset; | |
2459 | reloc_target = symval + rel->r_addend; | |
2460 | } | |
2461 | else | |
2462 | { | |
2463 | reloc_target = symval + rel->r_addend; | |
2464 | /* Reference symbol is absolute. */ | |
2465 | } | |
2466 | } | |
2467 | /* else ... reference symbol is extern. */ | |
2468 | ||
2469 | if (address_of_ret == reloc_target) | |
2470 | { | |
2471 | deleting_ret_is_safe = 0; | |
2472 | if (debug_relax) | |
2473 | printf ("ret from " | |
2474 | "rjmp/jmp ret sequence at address" | |
2475 | " 0x%x could not be deleted. ret" | |
2476 | " is target of a relocation.\n", | |
2477 | (int) address_of_ret); | |
91d6fa6a | 2478 | break; |
8d6a12ee NC |
2479 | } |
2480 | } | |
2481 | } | |
91d6fa6a NC |
2482 | |
2483 | if (deleting_ret_is_safe) | |
2484 | { | |
2485 | if (debug_relax) | |
2486 | printf ("unreachable ret instruction " | |
2487 | "at address 0x%x deleted.\n", | |
2488 | (int) dot + insn_size); | |
2489 | ||
2490 | /* Delete two bytes of data. */ | |
2491 | if (!elf32_avr_relax_delete_bytes (abfd, sec, | |
2492 | irel->r_offset + insn_size, 2)) | |
2493 | goto error_return; | |
2494 | ||
2495 | /* That will change things, so, we should relax | |
2496 | again. Note that this is not required, and it | |
2497 | may be slow. */ | |
2498 | *again = TRUE; | |
2499 | break; | |
2500 | } | |
df406460 | 2501 | } |
4cdc7696 NC |
2502 | } |
2503 | } | |
df406460 NC |
2504 | break; |
2505 | } | |
2506 | } | |
2507 | } | |
2508 | ||
2509 | if (contents != NULL | |
2510 | && elf_section_data (sec)->this_hdr.contents != contents) | |
2511 | { | |
2512 | if (! link_info->keep_memory) | |
2513 | free (contents); | |
2514 | else | |
2515 | { | |
2516 | /* Cache the section contents for elf_link_input_bfd. */ | |
2517 | elf_section_data (sec)->this_hdr.contents = contents; | |
2518 | } | |
2519 | } | |
2520 | ||
2521 | if (internal_relocs != NULL | |
2522 | && elf_section_data (sec)->relocs != internal_relocs) | |
2523 | free (internal_relocs); | |
2524 | ||
2525 | return TRUE; | |
2526 | ||
2527 | error_return: | |
2528 | if (isymbuf != NULL | |
2529 | && symtab_hdr->contents != (unsigned char *) isymbuf) | |
2530 | free (isymbuf); | |
2531 | if (contents != NULL | |
2532 | && elf_section_data (sec)->this_hdr.contents != contents) | |
2533 | free (contents); | |
2534 | if (internal_relocs != NULL | |
2535 | && elf_section_data (sec)->relocs != internal_relocs) | |
2536 | free (internal_relocs); | |
2537 | ||
4cdc7696 | 2538 | return FALSE; |
df406460 NC |
2539 | } |
2540 | ||
2541 | /* This is a version of bfd_generic_get_relocated_section_contents | |
4cdc7696 | 2542 | which uses elf32_avr_relocate_section. |
df406460 | 2543 | |
4cdc7696 | 2544 | For avr it's essentially a cut and paste taken from the H8300 port. |
df406460 | 2545 | The author of the relaxation support patch for avr had absolutely no |
4cdc7696 | 2546 | clue what is happening here but found out that this part of the code |
df406460 NC |
2547 | seems to be important. */ |
2548 | ||
2549 | static bfd_byte * | |
2550 | elf32_avr_get_relocated_section_contents (bfd *output_bfd, | |
2551 | struct bfd_link_info *link_info, | |
2552 | struct bfd_link_order *link_order, | |
2553 | bfd_byte *data, | |
2554 | bfd_boolean relocatable, | |
2555 | asymbol **symbols) | |
2556 | { | |
2557 | Elf_Internal_Shdr *symtab_hdr; | |
2558 | asection *input_section = link_order->u.indirect.section; | |
2559 | bfd *input_bfd = input_section->owner; | |
2560 | asection **sections = NULL; | |
2561 | Elf_Internal_Rela *internal_relocs = NULL; | |
2562 | Elf_Internal_Sym *isymbuf = NULL; | |
2563 | ||
2564 | /* We only need to handle the case of relaxing, or of having a | |
2565 | particular set of section contents, specially. */ | |
2566 | if (relocatable | |
2567 | || elf_section_data (input_section)->this_hdr.contents == NULL) | |
2568 | return bfd_generic_get_relocated_section_contents (output_bfd, link_info, | |
2569 | link_order, data, | |
2570 | relocatable, | |
2571 | symbols); | |
2572 | symtab_hdr = &elf_tdata (input_bfd)->symtab_hdr; | |
2573 | ||
2574 | memcpy (data, elf_section_data (input_section)->this_hdr.contents, | |
2575 | (size_t) input_section->size); | |
2576 | ||
2577 | if ((input_section->flags & SEC_RELOC) != 0 | |
2578 | && input_section->reloc_count > 0) | |
2579 | { | |
2580 | asection **secpp; | |
2581 | Elf_Internal_Sym *isym, *isymend; | |
2582 | bfd_size_type amt; | |
2583 | ||
2584 | internal_relocs = (_bfd_elf_link_read_relocs | |
4cdc7696 | 2585 | (input_bfd, input_section, NULL, NULL, FALSE)); |
df406460 NC |
2586 | if (internal_relocs == NULL) |
2587 | goto error_return; | |
2588 | ||
2589 | if (symtab_hdr->sh_info != 0) | |
2590 | { | |
2591 | isymbuf = (Elf_Internal_Sym *) symtab_hdr->contents; | |
2592 | if (isymbuf == NULL) | |
2593 | isymbuf = bfd_elf_get_elf_syms (input_bfd, symtab_hdr, | |
2594 | symtab_hdr->sh_info, 0, | |
2595 | NULL, NULL, NULL); | |
2596 | if (isymbuf == NULL) | |
2597 | goto error_return; | |
2598 | } | |
2599 | ||
2600 | amt = symtab_hdr->sh_info; | |
2601 | amt *= sizeof (asection *); | |
4cdc7696 | 2602 | sections = bfd_malloc (amt); |
df406460 NC |
2603 | if (sections == NULL && amt != 0) |
2604 | goto error_return; | |
2605 | ||
2606 | isymend = isymbuf + symtab_hdr->sh_info; | |
2607 | for (isym = isymbuf, secpp = sections; isym < isymend; ++isym, ++secpp) | |
2608 | { | |
2609 | asection *isec; | |
2610 | ||
2611 | if (isym->st_shndx == SHN_UNDEF) | |
2612 | isec = bfd_und_section_ptr; | |
2613 | else if (isym->st_shndx == SHN_ABS) | |
2614 | isec = bfd_abs_section_ptr; | |
2615 | else if (isym->st_shndx == SHN_COMMON) | |
2616 | isec = bfd_com_section_ptr; | |
2617 | else | |
2618 | isec = bfd_section_from_elf_index (input_bfd, isym->st_shndx); | |
2619 | ||
2620 | *secpp = isec; | |
2621 | } | |
2622 | ||
2623 | if (! elf32_avr_relocate_section (output_bfd, link_info, input_bfd, | |
2624 | input_section, data, internal_relocs, | |
2625 | isymbuf, sections)) | |
2626 | goto error_return; | |
2627 | ||
2628 | if (sections != NULL) | |
2629 | free (sections); | |
2630 | if (isymbuf != NULL | |
2631 | && symtab_hdr->contents != (unsigned char *) isymbuf) | |
2632 | free (isymbuf); | |
2633 | if (elf_section_data (input_section)->relocs != internal_relocs) | |
2634 | free (internal_relocs); | |
2635 | } | |
2636 | ||
2637 | return data; | |
2638 | ||
2639 | error_return: | |
2640 | if (sections != NULL) | |
2641 | free (sections); | |
2642 | if (isymbuf != NULL | |
2643 | && symtab_hdr->contents != (unsigned char *) isymbuf) | |
2644 | free (isymbuf); | |
2645 | if (internal_relocs != NULL | |
2646 | && elf_section_data (input_section)->relocs != internal_relocs) | |
2647 | free (internal_relocs); | |
2648 | return NULL; | |
2649 | } | |
2650 | ||
2651 | ||
28c9d252 NC |
2652 | /* Determines the hash entry name for a particular reloc. It consists of |
2653 | the identifier of the symbol section and the added reloc addend and | |
2654 | symbol offset relative to the section the symbol is attached to. */ | |
2655 | ||
2656 | static char * | |
2657 | avr_stub_name (const asection *symbol_section, | |
2658 | const bfd_vma symbol_offset, | |
2659 | const Elf_Internal_Rela *rela) | |
2660 | { | |
2661 | char *stub_name; | |
2662 | bfd_size_type len; | |
2663 | ||
2664 | len = 8 + 1 + 8 + 1 + 1; | |
2665 | stub_name = bfd_malloc (len); | |
2666 | ||
2667 | sprintf (stub_name, "%08x+%08x", | |
2668 | symbol_section->id & 0xffffffff, | |
2669 | (unsigned int) ((rela->r_addend & 0xffffffff) + symbol_offset)); | |
2670 | ||
2671 | return stub_name; | |
2672 | } | |
2673 | ||
2674 | ||
2675 | /* Add a new stub entry to the stub hash. Not all fields of the new | |
2676 | stub entry are initialised. */ | |
2677 | ||
2678 | static struct elf32_avr_stub_hash_entry * | |
2679 | avr_add_stub (const char *stub_name, | |
2680 | struct elf32_avr_link_hash_table *htab) | |
2681 | { | |
2682 | struct elf32_avr_stub_hash_entry *hsh; | |
2683 | ||
2684 | /* Enter this entry into the linker stub hash table. */ | |
2685 | hsh = avr_stub_hash_lookup (&htab->bstab, stub_name, TRUE, FALSE); | |
2686 | ||
2687 | if (hsh == NULL) | |
2688 | { | |
2689 | (*_bfd_error_handler) (_("%B: cannot create stub entry %s"), | |
2690 | NULL, stub_name); | |
2691 | return NULL; | |
2692 | } | |
2693 | ||
2694 | hsh->stub_offset = 0; | |
2695 | return hsh; | |
2696 | } | |
2697 | ||
2698 | /* We assume that there is already space allocated for the stub section | |
2699 | contents and that before building the stubs the section size is | |
2700 | initialized to 0. We assume that within the stub hash table entry, | |
2701 | the absolute position of the jmp target has been written in the | |
2702 | target_value field. We write here the offset of the generated jmp insn | |
2703 | relative to the trampoline section start to the stub_offset entry in | |
2704 | the stub hash table entry. */ | |
2705 | ||
2706 | static bfd_boolean | |
2707 | avr_build_one_stub (struct bfd_hash_entry *bh, void *in_arg) | |
2708 | { | |
2709 | struct elf32_avr_stub_hash_entry *hsh; | |
2710 | struct bfd_link_info *info; | |
2711 | struct elf32_avr_link_hash_table *htab; | |
2712 | bfd *stub_bfd; | |
2713 | bfd_byte *loc; | |
2714 | bfd_vma target; | |
2715 | bfd_vma starget; | |
2716 | ||
2717 | /* Basic opcode */ | |
2718 | bfd_vma jmp_insn = 0x0000940c; | |
2719 | ||
2720 | /* Massage our args to the form they really have. */ | |
2721 | hsh = avr_stub_hash_entry (bh); | |
2722 | ||
2723 | if (!hsh->is_actually_needed) | |
2724 | return TRUE; | |
2725 | ||
2726 | info = (struct bfd_link_info *) in_arg; | |
2727 | ||
2728 | htab = avr_link_hash_table (info); | |
64ee10b6 NC |
2729 | if (htab == NULL) |
2730 | return FALSE; | |
28c9d252 NC |
2731 | |
2732 | target = hsh->target_value; | |
2733 | ||
2734 | /* Make a note of the offset within the stubs for this entry. */ | |
2735 | hsh->stub_offset = htab->stub_sec->size; | |
2736 | loc = htab->stub_sec->contents + hsh->stub_offset; | |
2737 | ||
2738 | stub_bfd = htab->stub_sec->owner; | |
2739 | ||
2740 | if (debug_stubs) | |
2741 | printf ("Building one Stub. Address: 0x%x, Offset: 0x%x\n", | |
2742 | (unsigned int) target, | |
2743 | (unsigned int) hsh->stub_offset); | |
2744 | ||
2745 | /* We now have to add the information on the jump target to the bare | |
2746 | opcode bits already set in jmp_insn. */ | |
2747 | ||
2748 | /* Check for the alignment of the address. */ | |
2749 | if (target & 1) | |
2750 | return FALSE; | |
2751 | ||
2752 | starget = target >> 1; | |
2753 | jmp_insn |= ((starget & 0x10000) | ((starget << 3) & 0x1f00000)) >> 16; | |
2754 | bfd_put_16 (stub_bfd, jmp_insn, loc); | |
2755 | bfd_put_16 (stub_bfd, (bfd_vma) starget & 0xffff, loc + 2); | |
2756 | ||
2757 | htab->stub_sec->size += 4; | |
2758 | ||
2759 | /* Now add the entries in the address mapping table if there is still | |
2760 | space left. */ | |
2761 | { | |
2762 | unsigned int nr; | |
2763 | ||
2764 | nr = htab->amt_entry_cnt + 1; | |
2765 | if (nr <= htab->amt_max_entry_cnt) | |
2766 | { | |
2767 | htab->amt_entry_cnt = nr; | |
2768 | ||
2769 | htab->amt_stub_offsets[nr - 1] = hsh->stub_offset; | |
2770 | htab->amt_destination_addr[nr - 1] = target; | |
2771 | } | |
2772 | } | |
2773 | ||
2774 | return TRUE; | |
2775 | } | |
2776 | ||
2777 | static bfd_boolean | |
2778 | avr_mark_stub_not_to_be_necessary (struct bfd_hash_entry *bh, | |
c7e2358a | 2779 | void *in_arg ATTRIBUTE_UNUSED) |
28c9d252 NC |
2780 | { |
2781 | struct elf32_avr_stub_hash_entry *hsh; | |
28c9d252 | 2782 | |
28c9d252 NC |
2783 | hsh = avr_stub_hash_entry (bh); |
2784 | hsh->is_actually_needed = FALSE; | |
2785 | ||
2786 | return TRUE; | |
2787 | } | |
2788 | ||
2789 | static bfd_boolean | |
2790 | avr_size_one_stub (struct bfd_hash_entry *bh, void *in_arg) | |
2791 | { | |
2792 | struct elf32_avr_stub_hash_entry *hsh; | |
2793 | struct elf32_avr_link_hash_table *htab; | |
2794 | int size; | |
2795 | ||
2796 | /* Massage our args to the form they really have. */ | |
2797 | hsh = avr_stub_hash_entry (bh); | |
2798 | htab = in_arg; | |
2799 | ||
2800 | if (hsh->is_actually_needed) | |
2801 | size = 4; | |
2802 | else | |
2803 | size = 0; | |
2804 | ||
2805 | htab->stub_sec->size += size; | |
2806 | return TRUE; | |
2807 | } | |
2808 | ||
2809 | void | |
2810 | elf32_avr_setup_params (struct bfd_link_info *info, | |
2811 | bfd *avr_stub_bfd, | |
2812 | asection *avr_stub_section, | |
2813 | bfd_boolean no_stubs, | |
2814 | bfd_boolean deb_stubs, | |
2815 | bfd_boolean deb_relax, | |
2816 | bfd_vma pc_wrap_around, | |
2817 | bfd_boolean call_ret_replacement) | |
2818 | { | |
64ee10b6 | 2819 | struct elf32_avr_link_hash_table *htab = avr_link_hash_table (info); |
28c9d252 | 2820 | |
64ee10b6 NC |
2821 | if (htab == NULL) |
2822 | return; | |
28c9d252 NC |
2823 | htab->stub_sec = avr_stub_section; |
2824 | htab->stub_bfd = avr_stub_bfd; | |
2825 | htab->no_stubs = no_stubs; | |
2826 | ||
2827 | debug_relax = deb_relax; | |
2828 | debug_stubs = deb_stubs; | |
2829 | avr_pc_wrap_around = pc_wrap_around; | |
2830 | avr_replace_call_ret_sequences = call_ret_replacement; | |
2831 | } | |
2832 | ||
2833 | ||
2834 | /* Set up various things so that we can make a list of input sections | |
2835 | for each output section included in the link. Returns -1 on error, | |
2836 | 0 when no stubs will be needed, and 1 on success. It also sets | |
2837 | information on the stubs bfd and the stub section in the info | |
2838 | struct. */ | |
2839 | ||
2840 | int | |
2841 | elf32_avr_setup_section_lists (bfd *output_bfd, | |
2842 | struct bfd_link_info *info) | |
2843 | { | |
2844 | bfd *input_bfd; | |
2845 | unsigned int bfd_count; | |
2846 | int top_id, top_index; | |
2847 | asection *section; | |
2848 | asection **input_list, **list; | |
2849 | bfd_size_type amt; | |
4dfe6ac6 | 2850 | struct elf32_avr_link_hash_table *htab = avr_link_hash_table (info); |
28c9d252 | 2851 | |
64ee10b6 | 2852 | if (htab == NULL || htab->no_stubs) |
28c9d252 NC |
2853 | return 0; |
2854 | ||
2855 | /* Count the number of input BFDs and find the top input section id. */ | |
2856 | for (input_bfd = info->input_bfds, bfd_count = 0, top_id = 0; | |
2857 | input_bfd != NULL; | |
c72f2fb2 | 2858 | input_bfd = input_bfd->link.next) |
28c9d252 NC |
2859 | { |
2860 | bfd_count += 1; | |
2861 | for (section = input_bfd->sections; | |
2862 | section != NULL; | |
2863 | section = section->next) | |
2864 | if (top_id < section->id) | |
2865 | top_id = section->id; | |
2866 | } | |
2867 | ||
2868 | htab->bfd_count = bfd_count; | |
2869 | ||
2870 | /* We can't use output_bfd->section_count here to find the top output | |
2871 | section index as some sections may have been removed, and | |
2872 | strip_excluded_output_sections doesn't renumber the indices. */ | |
2873 | for (section = output_bfd->sections, top_index = 0; | |
2874 | section != NULL; | |
2875 | section = section->next) | |
2876 | if (top_index < section->index) | |
2877 | top_index = section->index; | |
2878 | ||
2879 | htab->top_index = top_index; | |
2880 | amt = sizeof (asection *) * (top_index + 1); | |
2881 | input_list = bfd_malloc (amt); | |
2882 | htab->input_list = input_list; | |
2883 | if (input_list == NULL) | |
2884 | return -1; | |
2885 | ||
2886 | /* For sections we aren't interested in, mark their entries with a | |
2887 | value we can check later. */ | |
2888 | list = input_list + top_index; | |
2889 | do | |
2890 | *list = bfd_abs_section_ptr; | |
2891 | while (list-- != input_list); | |
2892 | ||
2893 | for (section = output_bfd->sections; | |
2894 | section != NULL; | |
2895 | section = section->next) | |
2896 | if ((section->flags & SEC_CODE) != 0) | |
2897 | input_list[section->index] = NULL; | |
2898 | ||
2899 | return 1; | |
2900 | } | |
2901 | ||
2902 | ||
2903 | /* Read in all local syms for all input bfds, and create hash entries | |
2904 | for export stubs if we are building a multi-subspace shared lib. | |
2905 | Returns -1 on error, 0 otherwise. */ | |
2906 | ||
2907 | static int | |
2908 | get_local_syms (bfd *input_bfd, struct bfd_link_info *info) | |
2909 | { | |
2910 | unsigned int bfd_indx; | |
2911 | Elf_Internal_Sym *local_syms, **all_local_syms; | |
2912 | struct elf32_avr_link_hash_table *htab = avr_link_hash_table (info); | |
9a008db3 | 2913 | bfd_size_type amt; |
28c9d252 | 2914 | |
64ee10b6 NC |
2915 | if (htab == NULL) |
2916 | return -1; | |
2917 | ||
28c9d252 NC |
2918 | /* We want to read in symbol extension records only once. To do this |
2919 | we need to read in the local symbols in parallel and save them for | |
2920 | later use; so hold pointers to the local symbols in an array. */ | |
9a008db3 | 2921 | amt = sizeof (Elf_Internal_Sym *) * htab->bfd_count; |
28c9d252 NC |
2922 | all_local_syms = bfd_zmalloc (amt); |
2923 | htab->all_local_syms = all_local_syms; | |
2924 | if (all_local_syms == NULL) | |
2925 | return -1; | |
2926 | ||
2927 | /* Walk over all the input BFDs, swapping in local symbols. | |
2928 | If we are creating a shared library, create hash entries for the | |
2929 | export stubs. */ | |
2930 | for (bfd_indx = 0; | |
2931 | input_bfd != NULL; | |
c72f2fb2 | 2932 | input_bfd = input_bfd->link.next, bfd_indx++) |
28c9d252 NC |
2933 | { |
2934 | Elf_Internal_Shdr *symtab_hdr; | |
2935 | ||
2936 | /* We'll need the symbol table in a second. */ | |
2937 | symtab_hdr = &elf_tdata (input_bfd)->symtab_hdr; | |
2938 | if (symtab_hdr->sh_info == 0) | |
2939 | continue; | |
2940 | ||
2941 | /* We need an array of the local symbols attached to the input bfd. */ | |
2942 | local_syms = (Elf_Internal_Sym *) symtab_hdr->contents; | |
2943 | if (local_syms == NULL) | |
2944 | { | |
2945 | local_syms = bfd_elf_get_elf_syms (input_bfd, symtab_hdr, | |
2946 | symtab_hdr->sh_info, 0, | |
2947 | NULL, NULL, NULL); | |
2948 | /* Cache them for elf_link_input_bfd. */ | |
2949 | symtab_hdr->contents = (unsigned char *) local_syms; | |
2950 | } | |
2951 | if (local_syms == NULL) | |
2952 | return -1; | |
2953 | ||
2954 | all_local_syms[bfd_indx] = local_syms; | |
2955 | } | |
2956 | ||
2957 | return 0; | |
2958 | } | |
2959 | ||
2960 | #define ADD_DUMMY_STUBS_FOR_DEBUGGING 0 | |
2961 | ||
2962 | bfd_boolean | |
2963 | elf32_avr_size_stubs (bfd *output_bfd, | |
2964 | struct bfd_link_info *info, | |
2965 | bfd_boolean is_prealloc_run) | |
2966 | { | |
64ee10b6 NC |
2967 | struct elf32_avr_link_hash_table *htab; |
2968 | int stub_changed = 0; | |
28c9d252 | 2969 | |
64ee10b6 NC |
2970 | htab = avr_link_hash_table (info); |
2971 | if (htab == NULL) | |
2972 | return FALSE; | |
28c9d252 | 2973 | |
64ee10b6 NC |
2974 | /* At this point we initialize htab->vector_base |
2975 | To the start of the text output section. */ | |
2976 | htab->vector_base = htab->stub_sec->output_section->vma; | |
28c9d252 | 2977 | |
64ee10b6 NC |
2978 | if (get_local_syms (info->input_bfds, info)) |
2979 | { | |
2980 | if (htab->all_local_syms) | |
2981 | goto error_ret_free_local; | |
2982 | return FALSE; | |
2983 | } | |
28c9d252 NC |
2984 | |
2985 | if (ADD_DUMMY_STUBS_FOR_DEBUGGING) | |
2986 | { | |
2987 | struct elf32_avr_stub_hash_entry *test; | |
2988 | ||
2989 | test = avr_add_stub ("Hugo",htab); | |
2990 | test->target_value = 0x123456; | |
2991 | test->stub_offset = 13; | |
2992 | ||
2993 | test = avr_add_stub ("Hugo2",htab); | |
2994 | test->target_value = 0x84210; | |
2995 | test->stub_offset = 14; | |
2996 | } | |
2997 | ||
2998 | while (1) | |
2999 | { | |
3000 | bfd *input_bfd; | |
3001 | unsigned int bfd_indx; | |
3002 | ||
3003 | /* We will have to re-generate the stub hash table each time anything | |
3004 | in memory has changed. */ | |
3005 | ||
3006 | bfd_hash_traverse (&htab->bstab, avr_mark_stub_not_to_be_necessary, htab); | |
3007 | for (input_bfd = info->input_bfds, bfd_indx = 0; | |
3008 | input_bfd != NULL; | |
c72f2fb2 | 3009 | input_bfd = input_bfd->link.next, bfd_indx++) |
28c9d252 NC |
3010 | { |
3011 | Elf_Internal_Shdr *symtab_hdr; | |
3012 | asection *section; | |
3013 | Elf_Internal_Sym *local_syms; | |
3014 | ||
3015 | /* We'll need the symbol table in a second. */ | |
3016 | symtab_hdr = &elf_tdata (input_bfd)->symtab_hdr; | |
3017 | if (symtab_hdr->sh_info == 0) | |
3018 | continue; | |
3019 | ||
3020 | local_syms = htab->all_local_syms[bfd_indx]; | |
3021 | ||
3022 | /* Walk over each section attached to the input bfd. */ | |
3023 | for (section = input_bfd->sections; | |
3024 | section != NULL; | |
3025 | section = section->next) | |
3026 | { | |
3027 | Elf_Internal_Rela *internal_relocs, *irelaend, *irela; | |
3028 | ||
3029 | /* If there aren't any relocs, then there's nothing more | |
3030 | to do. */ | |
3031 | if ((section->flags & SEC_RELOC) == 0 | |
3032 | || section->reloc_count == 0) | |
3033 | continue; | |
3034 | ||
3035 | /* If this section is a link-once section that will be | |
3036 | discarded, then don't create any stubs. */ | |
3037 | if (section->output_section == NULL | |
3038 | || section->output_section->owner != output_bfd) | |
3039 | continue; | |
3040 | ||
3041 | /* Get the relocs. */ | |
3042 | internal_relocs | |
3043 | = _bfd_elf_link_read_relocs (input_bfd, section, NULL, NULL, | |
3044 | info->keep_memory); | |
3045 | if (internal_relocs == NULL) | |
3046 | goto error_ret_free_local; | |
3047 | ||
3048 | /* Now examine each relocation. */ | |
3049 | irela = internal_relocs; | |
3050 | irelaend = irela + section->reloc_count; | |
3051 | for (; irela < irelaend; irela++) | |
3052 | { | |
3053 | unsigned int r_type, r_indx; | |
3054 | struct elf32_avr_stub_hash_entry *hsh; | |
3055 | asection *sym_sec; | |
3056 | bfd_vma sym_value; | |
3057 | bfd_vma destination; | |
3058 | struct elf_link_hash_entry *hh; | |
3059 | char *stub_name; | |
3060 | ||
3061 | r_type = ELF32_R_TYPE (irela->r_info); | |
3062 | r_indx = ELF32_R_SYM (irela->r_info); | |
3063 | ||
3064 | /* Only look for 16 bit GS relocs. No other reloc will need a | |
3065 | stub. */ | |
3066 | if (!((r_type == R_AVR_16_PM) | |
3067 | || (r_type == R_AVR_LO8_LDI_GS) | |
3068 | || (r_type == R_AVR_HI8_LDI_GS))) | |
3069 | continue; | |
3070 | ||
3071 | /* Now determine the call target, its name, value, | |
3072 | section. */ | |
3073 | sym_sec = NULL; | |
3074 | sym_value = 0; | |
3075 | destination = 0; | |
3076 | hh = NULL; | |
3077 | if (r_indx < symtab_hdr->sh_info) | |
3078 | { | |
3079 | /* It's a local symbol. */ | |
3080 | Elf_Internal_Sym *sym; | |
3081 | Elf_Internal_Shdr *hdr; | |
4fbb74a6 | 3082 | unsigned int shndx; |
28c9d252 NC |
3083 | |
3084 | sym = local_syms + r_indx; | |
28c9d252 NC |
3085 | if (ELF_ST_TYPE (sym->st_info) != STT_SECTION) |
3086 | sym_value = sym->st_value; | |
4fbb74a6 AM |
3087 | shndx = sym->st_shndx; |
3088 | if (shndx < elf_numsections (input_bfd)) | |
3089 | { | |
3090 | hdr = elf_elfsections (input_bfd)[shndx]; | |
3091 | sym_sec = hdr->bfd_section; | |
3092 | destination = (sym_value + irela->r_addend | |
3093 | + sym_sec->output_offset | |
3094 | + sym_sec->output_section->vma); | |
3095 | } | |
28c9d252 NC |
3096 | } |
3097 | else | |
3098 | { | |
3099 | /* It's an external symbol. */ | |
3100 | int e_indx; | |
3101 | ||
3102 | e_indx = r_indx - symtab_hdr->sh_info; | |
3103 | hh = elf_sym_hashes (input_bfd)[e_indx]; | |
3104 | ||
3105 | while (hh->root.type == bfd_link_hash_indirect | |
3106 | || hh->root.type == bfd_link_hash_warning) | |
3107 | hh = (struct elf_link_hash_entry *) | |
3108 | (hh->root.u.i.link); | |
3109 | ||
3110 | if (hh->root.type == bfd_link_hash_defined | |
3111 | || hh->root.type == bfd_link_hash_defweak) | |
3112 | { | |
3113 | sym_sec = hh->root.u.def.section; | |
3114 | sym_value = hh->root.u.def.value; | |
3115 | if (sym_sec->output_section != NULL) | |
3116 | destination = (sym_value + irela->r_addend | |
3117 | + sym_sec->output_offset | |
3118 | + sym_sec->output_section->vma); | |
3119 | } | |
3120 | else if (hh->root.type == bfd_link_hash_undefweak) | |
3121 | { | |
3122 | if (! info->shared) | |
3123 | continue; | |
3124 | } | |
3125 | else if (hh->root.type == bfd_link_hash_undefined) | |
3126 | { | |
3127 | if (! (info->unresolved_syms_in_objects == RM_IGNORE | |
3128 | && (ELF_ST_VISIBILITY (hh->other) | |
3129 | == STV_DEFAULT))) | |
3130 | continue; | |
3131 | } | |
3132 | else | |
3133 | { | |
3134 | bfd_set_error (bfd_error_bad_value); | |
3135 | ||
3136 | error_ret_free_internal: | |
3137 | if (elf_section_data (section)->relocs == NULL) | |
3138 | free (internal_relocs); | |
3139 | goto error_ret_free_local; | |
3140 | } | |
3141 | } | |
3142 | ||
3143 | if (! avr_stub_is_required_for_16_bit_reloc | |
3144 | (destination - htab->vector_base)) | |
3145 | { | |
3146 | if (!is_prealloc_run) | |
3147 | /* We are having a reloc that does't need a stub. */ | |
3148 | continue; | |
3149 | ||
3150 | /* We don't right now know if a stub will be needed. | |
3151 | Let's rather be on the safe side. */ | |
3152 | } | |
3153 | ||
3154 | /* Get the name of this stub. */ | |
3155 | stub_name = avr_stub_name (sym_sec, sym_value, irela); | |
3156 | ||
3157 | if (!stub_name) | |
3158 | goto error_ret_free_internal; | |
3159 | ||
3160 | ||
3161 | hsh = avr_stub_hash_lookup (&htab->bstab, | |
3162 | stub_name, | |
3163 | FALSE, FALSE); | |
3164 | if (hsh != NULL) | |
3165 | { | |
3166 | /* The proper stub has already been created. Mark it | |
3167 | to be used and write the possibly changed destination | |
3168 | value. */ | |
3169 | hsh->is_actually_needed = TRUE; | |
3170 | hsh->target_value = destination; | |
3171 | free (stub_name); | |
3172 | continue; | |
3173 | } | |
3174 | ||
3175 | hsh = avr_add_stub (stub_name, htab); | |
3176 | if (hsh == NULL) | |
3177 | { | |
3178 | free (stub_name); | |
3179 | goto error_ret_free_internal; | |
3180 | } | |
3181 | ||
3182 | hsh->is_actually_needed = TRUE; | |
3183 | hsh->target_value = destination; | |
3184 | ||
3185 | if (debug_stubs) | |
3186 | printf ("Adding stub with destination 0x%x to the" | |
3187 | " hash table.\n", (unsigned int) destination); | |
3188 | if (debug_stubs) | |
3189 | printf ("(Pre-Alloc run: %i)\n", is_prealloc_run); | |
3190 | ||
3191 | stub_changed = TRUE; | |
3192 | } | |
3193 | ||
3194 | /* We're done with the internal relocs, free them. */ | |
3195 | if (elf_section_data (section)->relocs == NULL) | |
3196 | free (internal_relocs); | |
3197 | } | |
3198 | } | |
3199 | ||
3200 | /* Re-Calculate the number of needed stubs. */ | |
3201 | htab->stub_sec->size = 0; | |
3202 | bfd_hash_traverse (&htab->bstab, avr_size_one_stub, htab); | |
3203 | ||
3204 | if (!stub_changed) | |
3205 | break; | |
3206 | ||
3207 | stub_changed = FALSE; | |
3208 | } | |
3209 | ||
3210 | free (htab->all_local_syms); | |
3211 | return TRUE; | |
3212 | ||
3213 | error_ret_free_local: | |
3214 | free (htab->all_local_syms); | |
3215 | return FALSE; | |
3216 | } | |
3217 | ||
3218 | ||
3219 | /* Build all the stubs associated with the current output file. The | |
3220 | stubs are kept in a hash table attached to the main linker hash | |
3221 | table. We also set up the .plt entries for statically linked PIC | |
3222 | functions here. This function is called via hppaelf_finish in the | |
3223 | linker. */ | |
3224 | ||
3225 | bfd_boolean | |
3226 | elf32_avr_build_stubs (struct bfd_link_info *info) | |
3227 | { | |
3228 | asection *stub_sec; | |
3229 | struct bfd_hash_table *table; | |
3230 | struct elf32_avr_link_hash_table *htab; | |
3231 | bfd_size_type total_size = 0; | |
3232 | ||
3233 | htab = avr_link_hash_table (info); | |
64ee10b6 NC |
3234 | if (htab == NULL) |
3235 | return FALSE; | |
28c9d252 NC |
3236 | |
3237 | /* In case that there were several stub sections: */ | |
3238 | for (stub_sec = htab->stub_bfd->sections; | |
3239 | stub_sec != NULL; | |
3240 | stub_sec = stub_sec->next) | |
3241 | { | |
3242 | bfd_size_type size; | |
3243 | ||
3244 | /* Allocate memory to hold the linker stubs. */ | |
3245 | size = stub_sec->size; | |
3246 | total_size += size; | |
3247 | ||
3248 | stub_sec->contents = bfd_zalloc (htab->stub_bfd, size); | |
3249 | if (stub_sec->contents == NULL && size != 0) | |
3250 | return FALSE; | |
3251 | stub_sec->size = 0; | |
3252 | } | |
3253 | ||
3254 | /* Allocate memory for the adress mapping table. */ | |
3255 | htab->amt_entry_cnt = 0; | |
3256 | htab->amt_max_entry_cnt = total_size / 4; | |
3257 | htab->amt_stub_offsets = bfd_malloc (sizeof (bfd_vma) | |
3258 | * htab->amt_max_entry_cnt); | |
3259 | htab->amt_destination_addr = bfd_malloc (sizeof (bfd_vma) | |
3260 | * htab->amt_max_entry_cnt ); | |
3261 | ||
3262 | if (debug_stubs) | |
3263 | printf ("Allocating %i entries in the AMT\n", htab->amt_max_entry_cnt); | |
3264 | ||
3265 | /* Build the stubs as directed by the stub hash table. */ | |
3266 | table = &htab->bstab; | |
3267 | bfd_hash_traverse (table, avr_build_one_stub, info); | |
3268 | ||
3269 | if (debug_stubs) | |
3270 | printf ("Final Stub section Size: %i\n", (int) htab->stub_sec->size); | |
3271 | ||
3272 | return TRUE; | |
3273 | } | |
3274 | ||
adde6300 | 3275 | #define ELF_ARCH bfd_arch_avr |
ae95ffa6 | 3276 | #define ELF_TARGET_ID AVR_ELF_DATA |
adde6300 | 3277 | #define ELF_MACHINE_CODE EM_AVR |
aa4f99bb | 3278 | #define ELF_MACHINE_ALT1 EM_AVR_OLD |
adde6300 AM |
3279 | #define ELF_MAXPAGESIZE 1 |
3280 | ||
6d00b590 | 3281 | #define TARGET_LITTLE_SYM avr_elf32_vec |
adde6300 AM |
3282 | #define TARGET_LITTLE_NAME "elf32-avr" |
3283 | ||
28c9d252 | 3284 | #define bfd_elf32_bfd_link_hash_table_create elf32_avr_link_hash_table_create |
28c9d252 | 3285 | |
adde6300 AM |
3286 | #define elf_info_to_howto avr_info_to_howto_rela |
3287 | #define elf_info_to_howto_rel NULL | |
3288 | #define elf_backend_relocate_section elf32_avr_relocate_section | |
adde6300 | 3289 | #define elf_backend_can_gc_sections 1 |
f0fe0e16 | 3290 | #define elf_backend_rela_normal 1 |
adde6300 AM |
3291 | #define elf_backend_final_write_processing \ |
3292 | bfd_elf_avr_final_write_processing | |
3293 | #define elf_backend_object_p elf32_avr_object_p | |
3294 | ||
df406460 NC |
3295 | #define bfd_elf32_bfd_relax_section elf32_avr_relax_section |
3296 | #define bfd_elf32_bfd_get_relocated_section_contents \ | |
3297 | elf32_avr_get_relocated_section_contents | |
3298 | ||
adde6300 | 3299 | #include "elf32-target.h" |