Commit | Line | Data |
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adde6300 | 1 | /* AVR-specific support for 32-bit ELF |
4dfe6ac6 | 2 | Copyright 1999, 2000, 2001, 2002, 2003, 2004, 2005, 2006, 2007, 2008, 2009, |
dbaa2011 AM |
3 | 2010, 2011, 2012 |
4 | Free Software Foundation, Inc. | |
adde6300 AM |
5 | Contributed by Denis Chertykov <denisc@overta.ru> |
6 | ||
750bce0e | 7 | This file is part of BFD, the Binary File Descriptor library. |
adde6300 | 8 | |
750bce0e NC |
9 | This program is free software; you can redistribute it and/or modify |
10 | it under the terms of the GNU General Public License as published by | |
cd123cb7 | 11 | the Free Software Foundation; either version 3 of the License, or |
750bce0e | 12 | (at your option) any later version. |
adde6300 | 13 | |
750bce0e NC |
14 | This program is distributed in the hope that it will be useful, |
15 | but WITHOUT ANY WARRANTY; without even the implied warranty of | |
16 | MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the | |
17 | GNU General Public License for more details. | |
adde6300 | 18 | |
750bce0e NC |
19 | You should have received a copy of the GNU General Public License |
20 | along with this program; if not, write to the Free Software | |
4cdc7696 | 21 | Foundation, Inc., 51 Franklin Street - Fifth Floor, |
df406460 | 22 | Boston, MA 02110-1301, USA. */ |
adde6300 | 23 | |
adde6300 | 24 | #include "sysdep.h" |
3db64b00 | 25 | #include "bfd.h" |
adde6300 AM |
26 | #include "libbfd.h" |
27 | #include "elf-bfd.h" | |
28 | #include "elf/avr.h" | |
28c9d252 NC |
29 | #include "elf32-avr.h" |
30 | ||
31 | /* Enable debugging printout at stdout with this variable. */ | |
32 | static bfd_boolean debug_relax = FALSE; | |
33 | ||
34 | /* Enable debugging printout at stdout with this variable. */ | |
35 | static bfd_boolean debug_stubs = FALSE; | |
36 | ||
37 | /* Hash table initialization and handling. Code is taken from the hppa port | |
38 | and adapted to the needs of AVR. */ | |
39 | ||
40 | /* We use two hash tables to hold information for linking avr objects. | |
41 | ||
4dfe6ac6 | 42 | The first is the elf32_avr_link_hash_table which is derived from the |
28c9d252 NC |
43 | stanard ELF linker hash table. We use this as a place to attach the other |
44 | hash table and some static information. | |
45 | ||
46 | The second is the stub hash table which is derived from the base BFD | |
47 | hash table. The stub hash table holds the information on the linker | |
48 | stubs. */ | |
49 | ||
50 | struct elf32_avr_stub_hash_entry | |
51 | { | |
52 | /* Base hash table entry structure. */ | |
53 | struct bfd_hash_entry bh_root; | |
54 | ||
55 | /* Offset within stub_sec of the beginning of this stub. */ | |
56 | bfd_vma stub_offset; | |
57 | ||
58 | /* Given the symbol's value and its section we can determine its final | |
59 | value when building the stubs (so the stub knows where to jump). */ | |
60 | bfd_vma target_value; | |
61 | ||
62 | /* This way we could mark stubs to be no longer necessary. */ | |
63 | bfd_boolean is_actually_needed; | |
64 | }; | |
65 | ||
66 | struct elf32_avr_link_hash_table | |
67 | { | |
68 | /* The main hash table. */ | |
69 | struct elf_link_hash_table etab; | |
70 | ||
71 | /* The stub hash table. */ | |
72 | struct bfd_hash_table bstab; | |
73 | ||
74 | bfd_boolean no_stubs; | |
75 | ||
76 | /* Linker stub bfd. */ | |
77 | bfd *stub_bfd; | |
78 | ||
79 | /* The stub section. */ | |
80 | asection *stub_sec; | |
81 | ||
82 | /* Usually 0, unless we are generating code for a bootloader. Will | |
83 | be initialized by elf32_avr_size_stubs to the vma offset of the | |
84 | output section associated with the stub section. */ | |
85 | bfd_vma vector_base; | |
86 | ||
87 | /* Assorted information used by elf32_avr_size_stubs. */ | |
88 | unsigned int bfd_count; | |
89 | int top_index; | |
90 | asection ** input_list; | |
91 | Elf_Internal_Sym ** all_local_syms; | |
92 | ||
93 | /* Tables for mapping vma beyond the 128k boundary to the address of the | |
94 | corresponding stub. (AMT) | |
95 | "amt_max_entry_cnt" reflects the number of entries that memory is allocated | |
96 | for in the "amt_stub_offsets" and "amt_destination_addr" arrays. | |
97 | "amt_entry_cnt" informs how many of these entries actually contain | |
98 | useful data. */ | |
99 | unsigned int amt_entry_cnt; | |
100 | unsigned int amt_max_entry_cnt; | |
101 | bfd_vma * amt_stub_offsets; | |
102 | bfd_vma * amt_destination_addr; | |
103 | }; | |
104 | ||
105 | /* Various hash macros and functions. */ | |
106 | #define avr_link_hash_table(p) \ | |
64ee10b6 | 107 | /* PR 3874: Check that we have an AVR style hash table before using it. */\ |
4dfe6ac6 NC |
108 | (elf_hash_table_id ((struct elf_link_hash_table *) ((p)->hash)) \ |
109 | == AVR_ELF_DATA ? ((struct elf32_avr_link_hash_table *) ((p)->hash)) : NULL) | |
28c9d252 NC |
110 | |
111 | #define avr_stub_hash_entry(ent) \ | |
112 | ((struct elf32_avr_stub_hash_entry *)(ent)) | |
113 | ||
114 | #define avr_stub_hash_lookup(table, string, create, copy) \ | |
115 | ((struct elf32_avr_stub_hash_entry *) \ | |
116 | bfd_hash_lookup ((table), (string), (create), (copy))) | |
adde6300 | 117 | |
adde6300 AM |
118 | static reloc_howto_type elf_avr_howto_table[] = |
119 | { | |
120 | HOWTO (R_AVR_NONE, /* type */ | |
121 | 0, /* rightshift */ | |
122 | 2, /* size (0 = byte, 1 = short, 2 = long) */ | |
123 | 32, /* bitsize */ | |
b34976b6 | 124 | FALSE, /* pc_relative */ |
adde6300 AM |
125 | 0, /* bitpos */ |
126 | complain_overflow_bitfield, /* complain_on_overflow */ | |
127 | bfd_elf_generic_reloc, /* special_function */ | |
128 | "R_AVR_NONE", /* name */ | |
b34976b6 | 129 | FALSE, /* partial_inplace */ |
adde6300 AM |
130 | 0, /* src_mask */ |
131 | 0, /* dst_mask */ | |
b34976b6 | 132 | FALSE), /* pcrel_offset */ |
adde6300 AM |
133 | |
134 | HOWTO (R_AVR_32, /* type */ | |
135 | 0, /* rightshift */ | |
136 | 2, /* size (0 = byte, 1 = short, 2 = long) */ | |
137 | 32, /* bitsize */ | |
b34976b6 | 138 | FALSE, /* pc_relative */ |
adde6300 AM |
139 | 0, /* bitpos */ |
140 | complain_overflow_bitfield, /* complain_on_overflow */ | |
141 | bfd_elf_generic_reloc, /* special_function */ | |
142 | "R_AVR_32", /* name */ | |
b34976b6 | 143 | FALSE, /* partial_inplace */ |
adde6300 AM |
144 | 0xffffffff, /* src_mask */ |
145 | 0xffffffff, /* dst_mask */ | |
b34976b6 | 146 | FALSE), /* pcrel_offset */ |
adde6300 AM |
147 | |
148 | /* A 7 bit PC relative relocation. */ | |
149 | HOWTO (R_AVR_7_PCREL, /* type */ | |
150 | 1, /* rightshift */ | |
151 | 1, /* size (0 = byte, 1 = short, 2 = long) */ | |
152 | 7, /* bitsize */ | |
b34976b6 | 153 | TRUE, /* pc_relative */ |
adde6300 AM |
154 | 3, /* bitpos */ |
155 | complain_overflow_bitfield, /* complain_on_overflow */ | |
156 | bfd_elf_generic_reloc, /* special_function */ | |
157 | "R_AVR_7_PCREL", /* name */ | |
b34976b6 | 158 | FALSE, /* partial_inplace */ |
adde6300 AM |
159 | 0xffff, /* src_mask */ |
160 | 0xffff, /* dst_mask */ | |
b34976b6 | 161 | TRUE), /* pcrel_offset */ |
adde6300 AM |
162 | |
163 | /* A 13 bit PC relative relocation. */ | |
164 | HOWTO (R_AVR_13_PCREL, /* type */ | |
165 | 1, /* rightshift */ | |
166 | 1, /* size (0 = byte, 1 = short, 2 = long) */ | |
167 | 13, /* bitsize */ | |
b34976b6 | 168 | TRUE, /* pc_relative */ |
adde6300 AM |
169 | 0, /* bitpos */ |
170 | complain_overflow_bitfield, /* complain_on_overflow */ | |
171 | bfd_elf_generic_reloc, /* special_function */ | |
172 | "R_AVR_13_PCREL", /* name */ | |
b34976b6 | 173 | FALSE, /* partial_inplace */ |
adde6300 AM |
174 | 0xfff, /* src_mask */ |
175 | 0xfff, /* dst_mask */ | |
b34976b6 | 176 | TRUE), /* pcrel_offset */ |
adde6300 AM |
177 | |
178 | /* A 16 bit absolute relocation. */ | |
179 | HOWTO (R_AVR_16, /* type */ | |
180 | 0, /* rightshift */ | |
181 | 1, /* size (0 = byte, 1 = short, 2 = long) */ | |
182 | 16, /* bitsize */ | |
b34976b6 | 183 | FALSE, /* pc_relative */ |
adde6300 AM |
184 | 0, /* bitpos */ |
185 | complain_overflow_dont, /* complain_on_overflow */ | |
186 | bfd_elf_generic_reloc, /* special_function */ | |
187 | "R_AVR_16", /* name */ | |
b34976b6 | 188 | FALSE, /* partial_inplace */ |
adde6300 AM |
189 | 0xffff, /* src_mask */ |
190 | 0xffff, /* dst_mask */ | |
b34976b6 | 191 | FALSE), /* pcrel_offset */ |
adde6300 | 192 | |
28c9d252 NC |
193 | /* A 16 bit absolute relocation for command address |
194 | Will be changed when linker stubs are needed. */ | |
adde6300 AM |
195 | HOWTO (R_AVR_16_PM, /* type */ |
196 | 1, /* rightshift */ | |
197 | 1, /* size (0 = byte, 1 = short, 2 = long) */ | |
198 | 16, /* bitsize */ | |
b34976b6 | 199 | FALSE, /* pc_relative */ |
adde6300 AM |
200 | 0, /* bitpos */ |
201 | complain_overflow_bitfield, /* complain_on_overflow */ | |
202 | bfd_elf_generic_reloc, /* special_function */ | |
203 | "R_AVR_16_PM", /* name */ | |
b34976b6 | 204 | FALSE, /* partial_inplace */ |
adde6300 AM |
205 | 0xffff, /* src_mask */ |
206 | 0xffff, /* dst_mask */ | |
b34976b6 | 207 | FALSE), /* pcrel_offset */ |
adde6300 AM |
208 | /* A low 8 bit absolute relocation of 16 bit address. |
209 | For LDI command. */ | |
210 | HOWTO (R_AVR_LO8_LDI, /* type */ | |
211 | 0, /* rightshift */ | |
212 | 1, /* size (0 = byte, 1 = short, 2 = long) */ | |
213 | 8, /* bitsize */ | |
b34976b6 | 214 | FALSE, /* pc_relative */ |
adde6300 AM |
215 | 0, /* bitpos */ |
216 | complain_overflow_dont, /* complain_on_overflow */ | |
217 | bfd_elf_generic_reloc, /* special_function */ | |
218 | "R_AVR_LO8_LDI", /* name */ | |
b34976b6 | 219 | FALSE, /* partial_inplace */ |
adde6300 AM |
220 | 0xffff, /* src_mask */ |
221 | 0xffff, /* dst_mask */ | |
b34976b6 | 222 | FALSE), /* pcrel_offset */ |
adde6300 AM |
223 | /* A high 8 bit absolute relocation of 16 bit address. |
224 | For LDI command. */ | |
225 | HOWTO (R_AVR_HI8_LDI, /* type */ | |
226 | 8, /* rightshift */ | |
227 | 1, /* size (0 = byte, 1 = short, 2 = long) */ | |
228 | 8, /* bitsize */ | |
b34976b6 | 229 | FALSE, /* pc_relative */ |
adde6300 AM |
230 | 0, /* bitpos */ |
231 | complain_overflow_dont, /* complain_on_overflow */ | |
232 | bfd_elf_generic_reloc, /* special_function */ | |
233 | "R_AVR_HI8_LDI", /* name */ | |
b34976b6 | 234 | FALSE, /* partial_inplace */ |
adde6300 AM |
235 | 0xffff, /* src_mask */ |
236 | 0xffff, /* dst_mask */ | |
b34976b6 | 237 | FALSE), /* pcrel_offset */ |
adde6300 | 238 | /* A high 6 bit absolute relocation of 22 bit address. |
4cdc7696 | 239 | For LDI command. As well second most significant 8 bit value of |
df406460 | 240 | a 32 bit link-time constant. */ |
adde6300 AM |
241 | HOWTO (R_AVR_HH8_LDI, /* type */ |
242 | 16, /* rightshift */ | |
243 | 1, /* size (0 = byte, 1 = short, 2 = long) */ | |
244 | 8, /* bitsize */ | |
b34976b6 | 245 | FALSE, /* pc_relative */ |
adde6300 AM |
246 | 0, /* bitpos */ |
247 | complain_overflow_dont, /* complain_on_overflow */ | |
248 | bfd_elf_generic_reloc, /* special_function */ | |
249 | "R_AVR_HH8_LDI", /* name */ | |
b34976b6 | 250 | FALSE, /* partial_inplace */ |
adde6300 AM |
251 | 0xffff, /* src_mask */ |
252 | 0xffff, /* dst_mask */ | |
b34976b6 | 253 | FALSE), /* pcrel_offset */ |
adde6300 AM |
254 | /* A negative low 8 bit absolute relocation of 16 bit address. |
255 | For LDI command. */ | |
256 | HOWTO (R_AVR_LO8_LDI_NEG, /* type */ | |
257 | 0, /* rightshift */ | |
258 | 1, /* size (0 = byte, 1 = short, 2 = long) */ | |
259 | 8, /* bitsize */ | |
b34976b6 | 260 | FALSE, /* pc_relative */ |
adde6300 AM |
261 | 0, /* bitpos */ |
262 | complain_overflow_dont, /* complain_on_overflow */ | |
263 | bfd_elf_generic_reloc, /* special_function */ | |
264 | "R_AVR_LO8_LDI_NEG", /* name */ | |
b34976b6 | 265 | FALSE, /* partial_inplace */ |
adde6300 AM |
266 | 0xffff, /* src_mask */ |
267 | 0xffff, /* dst_mask */ | |
b34976b6 | 268 | FALSE), /* pcrel_offset */ |
df406460 | 269 | /* A negative high 8 bit absolute relocation of 16 bit address. |
adde6300 AM |
270 | For LDI command. */ |
271 | HOWTO (R_AVR_HI8_LDI_NEG, /* type */ | |
272 | 8, /* rightshift */ | |
273 | 1, /* size (0 = byte, 1 = short, 2 = long) */ | |
274 | 8, /* bitsize */ | |
b34976b6 | 275 | FALSE, /* pc_relative */ |
adde6300 AM |
276 | 0, /* bitpos */ |
277 | complain_overflow_dont, /* complain_on_overflow */ | |
278 | bfd_elf_generic_reloc, /* special_function */ | |
279 | "R_AVR_HI8_LDI_NEG", /* name */ | |
b34976b6 | 280 | FALSE, /* partial_inplace */ |
adde6300 AM |
281 | 0xffff, /* src_mask */ |
282 | 0xffff, /* dst_mask */ | |
b34976b6 | 283 | FALSE), /* pcrel_offset */ |
df406460 | 284 | /* A negative high 6 bit absolute relocation of 22 bit address. |
adde6300 AM |
285 | For LDI command. */ |
286 | HOWTO (R_AVR_HH8_LDI_NEG, /* type */ | |
287 | 16, /* rightshift */ | |
288 | 1, /* size (0 = byte, 1 = short, 2 = long) */ | |
289 | 8, /* bitsize */ | |
b34976b6 | 290 | FALSE, /* pc_relative */ |
adde6300 AM |
291 | 0, /* bitpos */ |
292 | complain_overflow_dont, /* complain_on_overflow */ | |
293 | bfd_elf_generic_reloc, /* special_function */ | |
294 | "R_AVR_HH8_LDI_NEG", /* name */ | |
b34976b6 | 295 | FALSE, /* partial_inplace */ |
adde6300 AM |
296 | 0xffff, /* src_mask */ |
297 | 0xffff, /* dst_mask */ | |
b34976b6 | 298 | FALSE), /* pcrel_offset */ |
adde6300 | 299 | /* A low 8 bit absolute relocation of 24 bit program memory address. |
28c9d252 | 300 | For LDI command. Will not be changed when linker stubs are needed. */ |
adde6300 AM |
301 | HOWTO (R_AVR_LO8_LDI_PM, /* type */ |
302 | 1, /* rightshift */ | |
303 | 1, /* size (0 = byte, 1 = short, 2 = long) */ | |
304 | 8, /* bitsize */ | |
b34976b6 | 305 | FALSE, /* pc_relative */ |
adde6300 AM |
306 | 0, /* bitpos */ |
307 | complain_overflow_dont, /* complain_on_overflow */ | |
308 | bfd_elf_generic_reloc, /* special_function */ | |
309 | "R_AVR_LO8_LDI_PM", /* name */ | |
b34976b6 | 310 | FALSE, /* partial_inplace */ |
adde6300 AM |
311 | 0xffff, /* src_mask */ |
312 | 0xffff, /* dst_mask */ | |
b34976b6 | 313 | FALSE), /* pcrel_offset */ |
28c9d252 NC |
314 | /* A low 8 bit absolute relocation of 24 bit program memory address. |
315 | For LDI command. Will not be changed when linker stubs are needed. */ | |
adde6300 AM |
316 | HOWTO (R_AVR_HI8_LDI_PM, /* type */ |
317 | 9, /* rightshift */ | |
318 | 1, /* size (0 = byte, 1 = short, 2 = long) */ | |
319 | 8, /* bitsize */ | |
b34976b6 | 320 | FALSE, /* pc_relative */ |
adde6300 AM |
321 | 0, /* bitpos */ |
322 | complain_overflow_dont, /* complain_on_overflow */ | |
323 | bfd_elf_generic_reloc, /* special_function */ | |
324 | "R_AVR_HI8_LDI_PM", /* name */ | |
b34976b6 | 325 | FALSE, /* partial_inplace */ |
adde6300 AM |
326 | 0xffff, /* src_mask */ |
327 | 0xffff, /* dst_mask */ | |
b34976b6 | 328 | FALSE), /* pcrel_offset */ |
28c9d252 NC |
329 | /* A low 8 bit absolute relocation of 24 bit program memory address. |
330 | For LDI command. Will not be changed when linker stubs are needed. */ | |
adde6300 AM |
331 | HOWTO (R_AVR_HH8_LDI_PM, /* type */ |
332 | 17, /* rightshift */ | |
333 | 1, /* size (0 = byte, 1 = short, 2 = long) */ | |
334 | 8, /* bitsize */ | |
b34976b6 | 335 | FALSE, /* pc_relative */ |
adde6300 AM |
336 | 0, /* bitpos */ |
337 | complain_overflow_dont, /* complain_on_overflow */ | |
338 | bfd_elf_generic_reloc, /* special_function */ | |
339 | "R_AVR_HH8_LDI_PM", /* name */ | |
b34976b6 | 340 | FALSE, /* partial_inplace */ |
adde6300 AM |
341 | 0xffff, /* src_mask */ |
342 | 0xffff, /* dst_mask */ | |
b34976b6 | 343 | FALSE), /* pcrel_offset */ |
28c9d252 NC |
344 | /* A low 8 bit absolute relocation of 24 bit program memory address. |
345 | For LDI command. Will not be changed when linker stubs are needed. */ | |
adde6300 AM |
346 | HOWTO (R_AVR_LO8_LDI_PM_NEG, /* type */ |
347 | 1, /* rightshift */ | |
348 | 1, /* size (0 = byte, 1 = short, 2 = long) */ | |
349 | 8, /* bitsize */ | |
b34976b6 | 350 | FALSE, /* pc_relative */ |
adde6300 AM |
351 | 0, /* bitpos */ |
352 | complain_overflow_dont, /* complain_on_overflow */ | |
353 | bfd_elf_generic_reloc, /* special_function */ | |
354 | "R_AVR_LO8_LDI_PM_NEG", /* name */ | |
b34976b6 | 355 | FALSE, /* partial_inplace */ |
adde6300 AM |
356 | 0xffff, /* src_mask */ |
357 | 0xffff, /* dst_mask */ | |
b34976b6 | 358 | FALSE), /* pcrel_offset */ |
28c9d252 NC |
359 | /* A low 8 bit absolute relocation of 24 bit program memory address. |
360 | For LDI command. Will not be changed when linker stubs are needed. */ | |
adde6300 AM |
361 | HOWTO (R_AVR_HI8_LDI_PM_NEG, /* type */ |
362 | 9, /* rightshift */ | |
363 | 1, /* size (0 = byte, 1 = short, 2 = long) */ | |
364 | 8, /* bitsize */ | |
b34976b6 | 365 | FALSE, /* pc_relative */ |
adde6300 AM |
366 | 0, /* bitpos */ |
367 | complain_overflow_dont, /* complain_on_overflow */ | |
368 | bfd_elf_generic_reloc, /* special_function */ | |
369 | "R_AVR_HI8_LDI_PM_NEG", /* name */ | |
b34976b6 | 370 | FALSE, /* partial_inplace */ |
adde6300 AM |
371 | 0xffff, /* src_mask */ |
372 | 0xffff, /* dst_mask */ | |
b34976b6 | 373 | FALSE), /* pcrel_offset */ |
28c9d252 NC |
374 | /* A low 8 bit absolute relocation of 24 bit program memory address. |
375 | For LDI command. Will not be changed when linker stubs are needed. */ | |
adde6300 AM |
376 | HOWTO (R_AVR_HH8_LDI_PM_NEG, /* type */ |
377 | 17, /* rightshift */ | |
378 | 1, /* size (0 = byte, 1 = short, 2 = long) */ | |
379 | 8, /* bitsize */ | |
b34976b6 | 380 | FALSE, /* pc_relative */ |
adde6300 AM |
381 | 0, /* bitpos */ |
382 | complain_overflow_dont, /* complain_on_overflow */ | |
383 | bfd_elf_generic_reloc, /* special_function */ | |
384 | "R_AVR_HH8_LDI_PM_NEG", /* name */ | |
b34976b6 | 385 | FALSE, /* partial_inplace */ |
adde6300 AM |
386 | 0xffff, /* src_mask */ |
387 | 0xffff, /* dst_mask */ | |
b34976b6 | 388 | FALSE), /* pcrel_offset */ |
adde6300 AM |
389 | /* Relocation for CALL command in ATmega. */ |
390 | HOWTO (R_AVR_CALL, /* type */ | |
391 | 1, /* rightshift */ | |
392 | 2, /* size (0 = byte, 1 = short, 2 = long) */ | |
393 | 23, /* bitsize */ | |
b34976b6 | 394 | FALSE, /* pc_relative */ |
adde6300 | 395 | 0, /* bitpos */ |
750bce0e | 396 | complain_overflow_dont,/* complain_on_overflow */ |
adde6300 AM |
397 | bfd_elf_generic_reloc, /* special_function */ |
398 | "R_AVR_CALL", /* name */ | |
b34976b6 | 399 | FALSE, /* partial_inplace */ |
adde6300 AM |
400 | 0xffffffff, /* src_mask */ |
401 | 0xffffffff, /* dst_mask */ | |
750bce0e NC |
402 | FALSE), /* pcrel_offset */ |
403 | /* A 16 bit absolute relocation of 16 bit address. | |
404 | For LDI command. */ | |
405 | HOWTO (R_AVR_LDI, /* type */ | |
406 | 0, /* rightshift */ | |
407 | 1, /* size (0 = byte, 1 = short, 2 = long) */ | |
408 | 16, /* bitsize */ | |
409 | FALSE, /* pc_relative */ | |
410 | 0, /* bitpos */ | |
411 | complain_overflow_dont,/* complain_on_overflow */ | |
412 | bfd_elf_generic_reloc, /* special_function */ | |
413 | "R_AVR_LDI", /* name */ | |
414 | FALSE, /* partial_inplace */ | |
415 | 0xffff, /* src_mask */ | |
416 | 0xffff, /* dst_mask */ | |
417 | FALSE), /* pcrel_offset */ | |
418 | /* A 6 bit absolute relocation of 6 bit offset. | |
419 | For ldd/sdd command. */ | |
420 | HOWTO (R_AVR_6, /* type */ | |
421 | 0, /* rightshift */ | |
422 | 0, /* size (0 = byte, 1 = short, 2 = long) */ | |
423 | 6, /* bitsize */ | |
424 | FALSE, /* pc_relative */ | |
425 | 0, /* bitpos */ | |
426 | complain_overflow_dont,/* complain_on_overflow */ | |
427 | bfd_elf_generic_reloc, /* special_function */ | |
428 | "R_AVR_6", /* name */ | |
429 | FALSE, /* partial_inplace */ | |
430 | 0xffff, /* src_mask */ | |
431 | 0xffff, /* dst_mask */ | |
432 | FALSE), /* pcrel_offset */ | |
433 | /* A 6 bit absolute relocation of 6 bit offset. | |
434 | For sbiw/adiw command. */ | |
435 | HOWTO (R_AVR_6_ADIW, /* type */ | |
436 | 0, /* rightshift */ | |
437 | 0, /* size (0 = byte, 1 = short, 2 = long) */ | |
438 | 6, /* bitsize */ | |
439 | FALSE, /* pc_relative */ | |
440 | 0, /* bitpos */ | |
441 | complain_overflow_dont,/* complain_on_overflow */ | |
442 | bfd_elf_generic_reloc, /* special_function */ | |
443 | "R_AVR_6_ADIW", /* name */ | |
444 | FALSE, /* partial_inplace */ | |
445 | 0xffff, /* src_mask */ | |
446 | 0xffff, /* dst_mask */ | |
df406460 NC |
447 | FALSE), /* pcrel_offset */ |
448 | /* Most significant 8 bit value of a 32 bit link-time constant. */ | |
449 | HOWTO (R_AVR_MS8_LDI, /* type */ | |
450 | 24, /* rightshift */ | |
451 | 1, /* size (0 = byte, 1 = short, 2 = long) */ | |
452 | 8, /* bitsize */ | |
453 | FALSE, /* pc_relative */ | |
454 | 0, /* bitpos */ | |
455 | complain_overflow_dont, /* complain_on_overflow */ | |
456 | bfd_elf_generic_reloc, /* special_function */ | |
457 | "R_AVR_MS8_LDI", /* name */ | |
458 | FALSE, /* partial_inplace */ | |
459 | 0xffff, /* src_mask */ | |
460 | 0xffff, /* dst_mask */ | |
461 | FALSE), /* pcrel_offset */ | |
462 | /* Negative most significant 8 bit value of a 32 bit link-time constant. */ | |
463 | HOWTO (R_AVR_MS8_LDI_NEG, /* type */ | |
464 | 24, /* rightshift */ | |
465 | 1, /* size (0 = byte, 1 = short, 2 = long) */ | |
466 | 8, /* bitsize */ | |
467 | FALSE, /* pc_relative */ | |
468 | 0, /* bitpos */ | |
469 | complain_overflow_dont, /* complain_on_overflow */ | |
470 | bfd_elf_generic_reloc, /* special_function */ | |
471 | "R_AVR_MS8_LDI_NEG", /* name */ | |
472 | FALSE, /* partial_inplace */ | |
473 | 0xffff, /* src_mask */ | |
474 | 0xffff, /* dst_mask */ | |
28c9d252 NC |
475 | FALSE), /* pcrel_offset */ |
476 | /* A low 8 bit absolute relocation of 24 bit program memory address. | |
17e57237 | 477 | For LDI command. Will be changed when linker stubs are needed. */ |
28c9d252 NC |
478 | HOWTO (R_AVR_LO8_LDI_GS, /* type */ |
479 | 1, /* rightshift */ | |
480 | 1, /* size (0 = byte, 1 = short, 2 = long) */ | |
481 | 8, /* bitsize */ | |
482 | FALSE, /* pc_relative */ | |
483 | 0, /* bitpos */ | |
484 | complain_overflow_dont, /* complain_on_overflow */ | |
485 | bfd_elf_generic_reloc, /* special_function */ | |
486 | "R_AVR_LO8_LDI_GS", /* name */ | |
487 | FALSE, /* partial_inplace */ | |
488 | 0xffff, /* src_mask */ | |
489 | 0xffff, /* dst_mask */ | |
490 | FALSE), /* pcrel_offset */ | |
491 | /* A low 8 bit absolute relocation of 24 bit program memory address. | |
17e57237 | 492 | For LDI command. Will be changed when linker stubs are needed. */ |
28c9d252 NC |
493 | HOWTO (R_AVR_HI8_LDI_GS, /* type */ |
494 | 9, /* rightshift */ | |
495 | 1, /* size (0 = byte, 1 = short, 2 = long) */ | |
496 | 8, /* bitsize */ | |
497 | FALSE, /* pc_relative */ | |
498 | 0, /* bitpos */ | |
499 | complain_overflow_dont, /* complain_on_overflow */ | |
500 | bfd_elf_generic_reloc, /* special_function */ | |
501 | "R_AVR_HI8_LDI_GS", /* name */ | |
502 | FALSE, /* partial_inplace */ | |
503 | 0xffff, /* src_mask */ | |
504 | 0xffff, /* dst_mask */ | |
17e57237 NC |
505 | FALSE), /* pcrel_offset */ |
506 | /* 8 bit offset. */ | |
507 | HOWTO (R_AVR_8, /* type */ | |
508 | 0, /* rightshift */ | |
509 | 0, /* size (0 = byte, 1 = short, 2 = long) */ | |
510 | 8, /* bitsize */ | |
511 | FALSE, /* pc_relative */ | |
512 | 0, /* bitpos */ | |
513 | complain_overflow_bitfield,/* complain_on_overflow */ | |
514 | bfd_elf_generic_reloc, /* special_function */ | |
515 | "R_AVR_8", /* name */ | |
516 | FALSE, /* partial_inplace */ | |
517 | 0x000000ff, /* src_mask */ | |
518 | 0x000000ff, /* dst_mask */ | |
519 | FALSE), /* pcrel_offset */ | |
99700d6f NC |
520 | /* lo8-part to use in .byte lo8(sym). */ |
521 | HOWTO (R_AVR_8_LO8, /* type */ | |
522 | 0, /* rightshift */ | |
523 | 0, /* size (0 = byte, 1 = short, 2 = long) */ | |
524 | 8, /* bitsize */ | |
525 | FALSE, /* pc_relative */ | |
526 | 0, /* bitpos */ | |
527 | complain_overflow_dont,/* complain_on_overflow */ | |
528 | bfd_elf_generic_reloc, /* special_function */ | |
529 | "R_AVR_8_LO8", /* name */ | |
530 | FALSE, /* partial_inplace */ | |
531 | 0xffffff, /* src_mask */ | |
532 | 0xffffff, /* dst_mask */ | |
533 | FALSE), /* pcrel_offset */ | |
534 | /* hi8-part to use in .byte hi8(sym). */ | |
535 | HOWTO (R_AVR_8_HI8, /* type */ | |
536 | 8, /* rightshift */ | |
537 | 0, /* size (0 = byte, 1 = short, 2 = long) */ | |
538 | 8, /* bitsize */ | |
539 | FALSE, /* pc_relative */ | |
540 | 0, /* bitpos */ | |
541 | complain_overflow_dont,/* complain_on_overflow */ | |
542 | bfd_elf_generic_reloc, /* special_function */ | |
543 | "R_AVR_8_HI8", /* name */ | |
544 | FALSE, /* partial_inplace */ | |
545 | 0xffffff, /* src_mask */ | |
546 | 0xffffff, /* dst_mask */ | |
547 | FALSE), /* pcrel_offset */ | |
40551fb8 NC |
548 | /* hlo8-part to use in .byte hlo8(sym). */ |
549 | HOWTO (R_AVR_8_HLO8, /* type */ | |
99700d6f NC |
550 | 16, /* rightshift */ |
551 | 0, /* size (0 = byte, 1 = short, 2 = long) */ | |
552 | 8, /* bitsize */ | |
553 | FALSE, /* pc_relative */ | |
554 | 0, /* bitpos */ | |
555 | complain_overflow_dont,/* complain_on_overflow */ | |
556 | bfd_elf_generic_reloc, /* special_function */ | |
40551fb8 | 557 | "R_AVR_8_HLO8", /* name */ |
99700d6f NC |
558 | FALSE, /* partial_inplace */ |
559 | 0xffffff, /* src_mask */ | |
560 | 0xffffff, /* dst_mask */ | |
561 | FALSE), /* pcrel_offset */ | |
adde6300 AM |
562 | }; |
563 | ||
564 | /* Map BFD reloc types to AVR ELF reloc types. */ | |
565 | ||
566 | struct avr_reloc_map | |
567 | { | |
568 | bfd_reloc_code_real_type bfd_reloc_val; | |
569 | unsigned int elf_reloc_val; | |
570 | }; | |
571 | ||
28c9d252 | 572 | static const struct avr_reloc_map avr_reloc_map[] = |
adde6300 AM |
573 | { |
574 | { BFD_RELOC_NONE, R_AVR_NONE }, | |
575 | { BFD_RELOC_32, R_AVR_32 }, | |
576 | { BFD_RELOC_AVR_7_PCREL, R_AVR_7_PCREL }, | |
577 | { BFD_RELOC_AVR_13_PCREL, R_AVR_13_PCREL }, | |
578 | { BFD_RELOC_16, R_AVR_16 }, | |
579 | { BFD_RELOC_AVR_16_PM, R_AVR_16_PM }, | |
580 | { BFD_RELOC_AVR_LO8_LDI, R_AVR_LO8_LDI}, | |
581 | { BFD_RELOC_AVR_HI8_LDI, R_AVR_HI8_LDI }, | |
582 | { BFD_RELOC_AVR_HH8_LDI, R_AVR_HH8_LDI }, | |
df406460 | 583 | { BFD_RELOC_AVR_MS8_LDI, R_AVR_MS8_LDI }, |
adde6300 AM |
584 | { BFD_RELOC_AVR_LO8_LDI_NEG, R_AVR_LO8_LDI_NEG }, |
585 | { BFD_RELOC_AVR_HI8_LDI_NEG, R_AVR_HI8_LDI_NEG }, | |
586 | { BFD_RELOC_AVR_HH8_LDI_NEG, R_AVR_HH8_LDI_NEG }, | |
df406460 | 587 | { BFD_RELOC_AVR_MS8_LDI_NEG, R_AVR_MS8_LDI_NEG }, |
adde6300 | 588 | { BFD_RELOC_AVR_LO8_LDI_PM, R_AVR_LO8_LDI_PM }, |
28c9d252 | 589 | { BFD_RELOC_AVR_LO8_LDI_GS, R_AVR_LO8_LDI_GS }, |
adde6300 | 590 | { BFD_RELOC_AVR_HI8_LDI_PM, R_AVR_HI8_LDI_PM }, |
28c9d252 | 591 | { BFD_RELOC_AVR_HI8_LDI_GS, R_AVR_HI8_LDI_GS }, |
adde6300 AM |
592 | { BFD_RELOC_AVR_HH8_LDI_PM, R_AVR_HH8_LDI_PM }, |
593 | { BFD_RELOC_AVR_LO8_LDI_PM_NEG, R_AVR_LO8_LDI_PM_NEG }, | |
594 | { BFD_RELOC_AVR_HI8_LDI_PM_NEG, R_AVR_HI8_LDI_PM_NEG }, | |
595 | { BFD_RELOC_AVR_HH8_LDI_PM_NEG, R_AVR_HH8_LDI_PM_NEG }, | |
750bce0e NC |
596 | { BFD_RELOC_AVR_CALL, R_AVR_CALL }, |
597 | { BFD_RELOC_AVR_LDI, R_AVR_LDI }, | |
598 | { BFD_RELOC_AVR_6, R_AVR_6 }, | |
17e57237 | 599 | { BFD_RELOC_AVR_6_ADIW, R_AVR_6_ADIW }, |
99700d6f NC |
600 | { BFD_RELOC_8, R_AVR_8 }, |
601 | { BFD_RELOC_AVR_8_LO, R_AVR_8_LO8 }, | |
602 | { BFD_RELOC_AVR_8_HI, R_AVR_8_HI8 }, | |
40551fb8 | 603 | { BFD_RELOC_AVR_8_HLO, R_AVR_8_HLO8 } |
adde6300 AM |
604 | }; |
605 | ||
df406460 | 606 | /* Meant to be filled one day with the wrap around address for the |
4cdc7696 | 607 | specific device. I.e. should get the value 0x4000 for 16k devices, |
df406460 | 608 | 0x8000 for 32k devices and so on. |
4cdc7696 | 609 | |
df406460 | 610 | We initialize it here with a value of 0x1000000 resulting in |
4cdc7696 NC |
611 | that we will never suggest a wrap-around jump during relaxation. |
612 | The logic of the source code later on assumes that in | |
df406460 | 613 | avr_pc_wrap_around one single bit is set. */ |
28c9d252 NC |
614 | static bfd_vma avr_pc_wrap_around = 0x10000000; |
615 | ||
616 | /* If this variable holds a value different from zero, the linker relaxation | |
617 | machine will try to optimize call/ret sequences by a single jump | |
618 | instruction. This option could be switched off by a linker switch. */ | |
619 | static int avr_replace_call_ret_sequences = 1; | |
620 | \f | |
621 | /* Initialize an entry in the stub hash table. */ | |
622 | ||
623 | static struct bfd_hash_entry * | |
624 | stub_hash_newfunc (struct bfd_hash_entry *entry, | |
625 | struct bfd_hash_table *table, | |
626 | const char *string) | |
627 | { | |
628 | /* Allocate the structure if it has not already been allocated by a | |
629 | subclass. */ | |
630 | if (entry == NULL) | |
631 | { | |
632 | entry = bfd_hash_allocate (table, | |
633 | sizeof (struct elf32_avr_stub_hash_entry)); | |
634 | if (entry == NULL) | |
635 | return entry; | |
636 | } | |
637 | ||
638 | /* Call the allocation method of the superclass. */ | |
639 | entry = bfd_hash_newfunc (entry, table, string); | |
640 | if (entry != NULL) | |
641 | { | |
642 | struct elf32_avr_stub_hash_entry *hsh; | |
643 | ||
644 | /* Initialize the local fields. */ | |
645 | hsh = avr_stub_hash_entry (entry); | |
646 | hsh->stub_offset = 0; | |
647 | hsh->target_value = 0; | |
648 | } | |
649 | ||
650 | return entry; | |
651 | } | |
652 | ||
64ee10b6 NC |
653 | /* This function is just a straight passthrough to the real |
654 | function in linker.c. Its prupose is so that its address | |
655 | can be compared inside the avr_link_hash_table macro. */ | |
656 | ||
657 | static struct bfd_hash_entry * | |
658 | elf32_avr_link_hash_newfunc (struct bfd_hash_entry * entry, | |
659 | struct bfd_hash_table * table, | |
660 | const char * string) | |
661 | { | |
662 | return _bfd_elf_link_hash_newfunc (entry, table, string); | |
663 | } | |
664 | ||
28c9d252 NC |
665 | /* Create the derived linker hash table. The AVR ELF port uses the derived |
666 | hash table to keep information specific to the AVR ELF linker (without | |
667 | using static variables). */ | |
668 | ||
669 | static struct bfd_link_hash_table * | |
670 | elf32_avr_link_hash_table_create (bfd *abfd) | |
671 | { | |
672 | struct elf32_avr_link_hash_table *htab; | |
673 | bfd_size_type amt = sizeof (*htab); | |
674 | ||
7bf52ea2 | 675 | htab = bfd_zmalloc (amt); |
28c9d252 NC |
676 | if (htab == NULL) |
677 | return NULL; | |
678 | ||
679 | if (!_bfd_elf_link_hash_table_init (&htab->etab, abfd, | |
64ee10b6 | 680 | elf32_avr_link_hash_newfunc, |
4dfe6ac6 NC |
681 | sizeof (struct elf_link_hash_entry), |
682 | AVR_ELF_DATA)) | |
28c9d252 NC |
683 | { |
684 | free (htab); | |
685 | return NULL; | |
686 | } | |
687 | ||
688 | /* Init the stub hash table too. */ | |
689 | if (!bfd_hash_table_init (&htab->bstab, stub_hash_newfunc, | |
690 | sizeof (struct elf32_avr_stub_hash_entry))) | |
691 | return NULL; | |
4cdc7696 | 692 | |
28c9d252 NC |
693 | return &htab->etab.root; |
694 | } | |
695 | ||
696 | /* Free the derived linker hash table. */ | |
697 | ||
698 | static void | |
699 | elf32_avr_link_hash_table_free (struct bfd_link_hash_table *btab) | |
700 | { | |
701 | struct elf32_avr_link_hash_table *htab | |
702 | = (struct elf32_avr_link_hash_table *) btab; | |
703 | ||
704 | /* Free the address mapping table. */ | |
705 | if (htab->amt_stub_offsets != NULL) | |
706 | free (htab->amt_stub_offsets); | |
707 | if (htab->amt_destination_addr != NULL) | |
708 | free (htab->amt_destination_addr); | |
709 | ||
710 | bfd_hash_table_free (&htab->bstab); | |
9f7c3e5e | 711 | _bfd_elf_link_hash_table_free (btab); |
28c9d252 | 712 | } |
df406460 NC |
713 | |
714 | /* Calculates the effective distance of a pc relative jump/call. */ | |
73160847 | 715 | |
df406460 NC |
716 | static int |
717 | avr_relative_distance_considering_wrap_around (unsigned int distance) | |
4cdc7696 | 718 | { |
df406460 | 719 | unsigned int wrap_around_mask = avr_pc_wrap_around - 1; |
df406460 NC |
720 | int dist_with_wrap_around = distance & wrap_around_mask; |
721 | ||
4cdc7696 | 722 | if (dist_with_wrap_around > ((int) (avr_pc_wrap_around >> 1))) |
df406460 NC |
723 | dist_with_wrap_around -= avr_pc_wrap_around; |
724 | ||
725 | return dist_with_wrap_around; | |
726 | } | |
727 | ||
728 | ||
adde6300 | 729 | static reloc_howto_type * |
4cdc7696 NC |
730 | bfd_elf32_bfd_reloc_type_lookup (bfd *abfd ATTRIBUTE_UNUSED, |
731 | bfd_reloc_code_real_type code) | |
adde6300 AM |
732 | { |
733 | unsigned int i; | |
734 | ||
735 | for (i = 0; | |
736 | i < sizeof (avr_reloc_map) / sizeof (struct avr_reloc_map); | |
737 | i++) | |
73160847 NC |
738 | if (avr_reloc_map[i].bfd_reloc_val == code) |
739 | return &elf_avr_howto_table[avr_reloc_map[i].elf_reloc_val]; | |
adde6300 AM |
740 | |
741 | return NULL; | |
742 | } | |
743 | ||
157090f7 AM |
744 | static reloc_howto_type * |
745 | bfd_elf32_bfd_reloc_name_lookup (bfd *abfd ATTRIBUTE_UNUSED, | |
746 | const char *r_name) | |
747 | { | |
748 | unsigned int i; | |
749 | ||
750 | for (i = 0; | |
751 | i < sizeof (elf_avr_howto_table) / sizeof (elf_avr_howto_table[0]); | |
752 | i++) | |
753 | if (elf_avr_howto_table[i].name != NULL | |
754 | && strcasecmp (elf_avr_howto_table[i].name, r_name) == 0) | |
755 | return &elf_avr_howto_table[i]; | |
756 | ||
757 | return NULL; | |
758 | } | |
759 | ||
adde6300 AM |
760 | /* Set the howto pointer for an AVR ELF reloc. */ |
761 | ||
762 | static void | |
4cdc7696 NC |
763 | avr_info_to_howto_rela (bfd *abfd ATTRIBUTE_UNUSED, |
764 | arelent *cache_ptr, | |
765 | Elf_Internal_Rela *dst) | |
adde6300 AM |
766 | { |
767 | unsigned int r_type; | |
768 | ||
769 | r_type = ELF32_R_TYPE (dst->r_info); | |
770 | BFD_ASSERT (r_type < (unsigned int) R_AVR_max); | |
771 | cache_ptr->howto = &elf_avr_howto_table[r_type]; | |
772 | } | |
773 | ||
28c9d252 NC |
774 | static bfd_boolean |
775 | avr_stub_is_required_for_16_bit_reloc (bfd_vma relocation) | |
776 | { | |
777 | return (relocation >= 0x020000); | |
778 | } | |
779 | ||
780 | /* Returns the address of the corresponding stub if there is one. | |
781 | Returns otherwise an address above 0x020000. This function | |
782 | could also be used, if there is no knowledge on the section where | |
783 | the destination is found. */ | |
784 | ||
785 | static bfd_vma | |
786 | avr_get_stub_addr (bfd_vma srel, | |
787 | struct elf32_avr_link_hash_table *htab) | |
788 | { | |
91d6fa6a | 789 | unsigned int sindex; |
28c9d252 NC |
790 | bfd_vma stub_sec_addr = |
791 | (htab->stub_sec->output_section->vma + | |
792 | htab->stub_sec->output_offset); | |
793 | ||
91d6fa6a NC |
794 | for (sindex = 0; sindex < htab->amt_max_entry_cnt; sindex ++) |
795 | if (htab->amt_destination_addr[sindex] == srel) | |
796 | return htab->amt_stub_offsets[sindex] + stub_sec_addr; | |
28c9d252 NC |
797 | |
798 | /* Return an address that could not be reached by 16 bit relocs. */ | |
799 | return 0x020000; | |
800 | } | |
801 | ||
adde6300 AM |
802 | /* Perform a single relocation. By default we use the standard BFD |
803 | routines, but a few relocs, we have to do them ourselves. */ | |
804 | ||
805 | static bfd_reloc_status_type | |
28c9d252 NC |
806 | avr_final_link_relocate (reloc_howto_type * howto, |
807 | bfd * input_bfd, | |
808 | asection * input_section, | |
809 | bfd_byte * contents, | |
810 | Elf_Internal_Rela * rel, | |
811 | bfd_vma relocation, | |
812 | struct elf32_avr_link_hash_table * htab) | |
adde6300 AM |
813 | { |
814 | bfd_reloc_status_type r = bfd_reloc_ok; | |
815 | bfd_vma x; | |
816 | bfd_signed_vma srel; | |
28c9d252 NC |
817 | bfd_signed_vma reloc_addr; |
818 | bfd_boolean use_stubs = FALSE; | |
819 | /* Usually is 0, unless we are generating code for a bootloader. */ | |
820 | bfd_signed_vma base_addr = htab->vector_base; | |
821 | ||
822 | /* Absolute addr of the reloc in the final excecutable. */ | |
823 | reloc_addr = rel->r_offset + input_section->output_section->vma | |
824 | + input_section->output_offset; | |
adde6300 AM |
825 | |
826 | switch (howto->type) | |
827 | { | |
828 | case R_AVR_7_PCREL: | |
829 | contents += rel->r_offset; | |
830 | srel = (bfd_signed_vma) relocation; | |
831 | srel += rel->r_addend; | |
832 | srel -= rel->r_offset; | |
a7c10850 | 833 | srel -= 2; /* Branch instructions add 2 to the PC... */ |
adde6300 AM |
834 | srel -= (input_section->output_section->vma + |
835 | input_section->output_offset); | |
836 | ||
837 | if (srel & 1) | |
838 | return bfd_reloc_outofrange; | |
839 | if (srel > ((1 << 7) - 1) || (srel < - (1 << 7))) | |
840 | return bfd_reloc_overflow; | |
841 | x = bfd_get_16 (input_bfd, contents); | |
842 | x = (x & 0xfc07) | (((srel >> 1) << 3) & 0x3f8); | |
843 | bfd_put_16 (input_bfd, x, contents); | |
844 | break; | |
845 | ||
846 | case R_AVR_13_PCREL: | |
847 | contents += rel->r_offset; | |
848 | srel = (bfd_signed_vma) relocation; | |
849 | srel += rel->r_addend; | |
850 | srel -= rel->r_offset; | |
a7c10850 | 851 | srel -= 2; /* Branch instructions add 2 to the PC... */ |
adde6300 AM |
852 | srel -= (input_section->output_section->vma + |
853 | input_section->output_offset); | |
854 | ||
855 | if (srel & 1) | |
856 | return bfd_reloc_outofrange; | |
857 | ||
df406460 NC |
858 | srel = avr_relative_distance_considering_wrap_around (srel); |
859 | ||
adde6300 AM |
860 | /* AVR addresses commands as words. */ |
861 | srel >>= 1; | |
862 | ||
863 | /* Check for overflow. */ | |
864 | if (srel < -2048 || srel > 2047) | |
865 | { | |
df406460 NC |
866 | /* Relative distance is too large. */ |
867 | ||
654c3c9f | 868 | /* Always apply WRAPAROUND for avr2, avr25, and avr4. */ |
65aa24b6 | 869 | switch (bfd_get_mach (input_bfd)) |
adde6300 | 870 | { |
65aa24b6 | 871 | case bfd_mach_avr2: |
654c3c9f | 872 | case bfd_mach_avr25: |
65aa24b6 NC |
873 | case bfd_mach_avr4: |
874 | break; | |
875 | ||
876 | default: | |
877 | return bfd_reloc_overflow; | |
adde6300 | 878 | } |
adde6300 AM |
879 | } |
880 | ||
881 | x = bfd_get_16 (input_bfd, contents); | |
882 | x = (x & 0xf000) | (srel & 0xfff); | |
883 | bfd_put_16 (input_bfd, x, contents); | |
884 | break; | |
885 | ||
886 | case R_AVR_LO8_LDI: | |
887 | contents += rel->r_offset; | |
888 | srel = (bfd_signed_vma) relocation + rel->r_addend; | |
889 | x = bfd_get_16 (input_bfd, contents); | |
890 | x = (x & 0xf0f0) | (srel & 0xf) | ((srel << 4) & 0xf00); | |
891 | bfd_put_16 (input_bfd, x, contents); | |
892 | break; | |
893 | ||
750bce0e NC |
894 | case R_AVR_LDI: |
895 | contents += rel->r_offset; | |
896 | srel = (bfd_signed_vma) relocation + rel->r_addend; | |
4cdc7696 NC |
897 | if (((srel > 0) && (srel & 0xffff) > 255) |
898 | || ((srel < 0) && ((-srel) & 0xffff) > 128)) | |
df406460 NC |
899 | /* Remove offset for data/eeprom section. */ |
900 | return bfd_reloc_overflow; | |
901 | ||
750bce0e NC |
902 | x = bfd_get_16 (input_bfd, contents); |
903 | x = (x & 0xf0f0) | (srel & 0xf) | ((srel << 4) & 0xf00); | |
904 | bfd_put_16 (input_bfd, x, contents); | |
905 | break; | |
906 | ||
907 | case R_AVR_6: | |
908 | contents += rel->r_offset; | |
909 | srel = (bfd_signed_vma) relocation + rel->r_addend; | |
910 | if (((srel & 0xffff) > 63) || (srel < 0)) | |
911 | /* Remove offset for data/eeprom section. */ | |
912 | return bfd_reloc_overflow; | |
913 | x = bfd_get_16 (input_bfd, contents); | |
4cdc7696 | 914 | x = (x & 0xd3f8) | ((srel & 7) | ((srel & (3 << 3)) << 7) |
df406460 | 915 | | ((srel & (1 << 5)) << 8)); |
750bce0e NC |
916 | bfd_put_16 (input_bfd, x, contents); |
917 | break; | |
918 | ||
919 | case R_AVR_6_ADIW: | |
920 | contents += rel->r_offset; | |
921 | srel = (bfd_signed_vma) relocation + rel->r_addend; | |
922 | if (((srel & 0xffff) > 63) || (srel < 0)) | |
923 | /* Remove offset for data/eeprom section. */ | |
924 | return bfd_reloc_overflow; | |
925 | x = bfd_get_16 (input_bfd, contents); | |
4cdc7696 | 926 | x = (x & 0xff30) | (srel & 0xf) | ((srel & 0x30) << 2); |
750bce0e NC |
927 | bfd_put_16 (input_bfd, x, contents); |
928 | break; | |
929 | ||
adde6300 AM |
930 | case R_AVR_HI8_LDI: |
931 | contents += rel->r_offset; | |
932 | srel = (bfd_signed_vma) relocation + rel->r_addend; | |
933 | srel = (srel >> 8) & 0xff; | |
934 | x = bfd_get_16 (input_bfd, contents); | |
935 | x = (x & 0xf0f0) | (srel & 0xf) | ((srel << 4) & 0xf00); | |
936 | bfd_put_16 (input_bfd, x, contents); | |
937 | break; | |
938 | ||
939 | case R_AVR_HH8_LDI: | |
940 | contents += rel->r_offset; | |
941 | srel = (bfd_signed_vma) relocation + rel->r_addend; | |
942 | srel = (srel >> 16) & 0xff; | |
943 | x = bfd_get_16 (input_bfd, contents); | |
944 | x = (x & 0xf0f0) | (srel & 0xf) | ((srel << 4) & 0xf00); | |
945 | bfd_put_16 (input_bfd, x, contents); | |
946 | break; | |
947 | ||
df406460 NC |
948 | case R_AVR_MS8_LDI: |
949 | contents += rel->r_offset; | |
950 | srel = (bfd_signed_vma) relocation + rel->r_addend; | |
951 | srel = (srel >> 24) & 0xff; | |
952 | x = bfd_get_16 (input_bfd, contents); | |
953 | x = (x & 0xf0f0) | (srel & 0xf) | ((srel << 4) & 0xf00); | |
954 | bfd_put_16 (input_bfd, x, contents); | |
955 | break; | |
956 | ||
adde6300 AM |
957 | case R_AVR_LO8_LDI_NEG: |
958 | contents += rel->r_offset; | |
959 | srel = (bfd_signed_vma) relocation + rel->r_addend; | |
960 | srel = -srel; | |
961 | x = bfd_get_16 (input_bfd, contents); | |
962 | x = (x & 0xf0f0) | (srel & 0xf) | ((srel << 4) & 0xf00); | |
963 | bfd_put_16 (input_bfd, x, contents); | |
964 | break; | |
965 | ||
966 | case R_AVR_HI8_LDI_NEG: | |
967 | contents += rel->r_offset; | |
968 | srel = (bfd_signed_vma) relocation + rel->r_addend; | |
969 | srel = -srel; | |
970 | srel = (srel >> 8) & 0xff; | |
971 | x = bfd_get_16 (input_bfd, contents); | |
972 | x = (x & 0xf0f0) | (srel & 0xf) | ((srel << 4) & 0xf00); | |
973 | bfd_put_16 (input_bfd, x, contents); | |
974 | break; | |
975 | ||
976 | case R_AVR_HH8_LDI_NEG: | |
977 | contents += rel->r_offset; | |
978 | srel = (bfd_signed_vma) relocation + rel->r_addend; | |
979 | srel = -srel; | |
980 | srel = (srel >> 16) & 0xff; | |
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 | ||
df406460 NC |
986 | case R_AVR_MS8_LDI_NEG: |
987 | contents += rel->r_offset; | |
988 | srel = (bfd_signed_vma) relocation + rel->r_addend; | |
989 | srel = -srel; | |
990 | srel = (srel >> 24) & 0xff; | |
991 | x = bfd_get_16 (input_bfd, contents); | |
992 | x = (x & 0xf0f0) | (srel & 0xf) | ((srel << 4) & 0xf00); | |
993 | bfd_put_16 (input_bfd, x, contents); | |
994 | break; | |
995 | ||
28c9d252 NC |
996 | case R_AVR_LO8_LDI_GS: |
997 | use_stubs = (!htab->no_stubs); | |
998 | /* Fall through. */ | |
adde6300 AM |
999 | case R_AVR_LO8_LDI_PM: |
1000 | contents += rel->r_offset; | |
1001 | srel = (bfd_signed_vma) relocation + rel->r_addend; | |
28c9d252 NC |
1002 | |
1003 | if (use_stubs | |
1004 | && avr_stub_is_required_for_16_bit_reloc (srel - base_addr)) | |
1005 | { | |
1006 | bfd_vma old_srel = srel; | |
1007 | ||
1008 | /* We need to use the address of the stub instead. */ | |
1009 | srel = avr_get_stub_addr (srel, htab); | |
1010 | if (debug_stubs) | |
1011 | printf ("LD: Using jump stub (at 0x%x) with destination 0x%x for " | |
1012 | "reloc at address 0x%x.\n", | |
1013 | (unsigned int) srel, | |
1014 | (unsigned int) old_srel, | |
1015 | (unsigned int) reloc_addr); | |
1016 | ||
1017 | if (avr_stub_is_required_for_16_bit_reloc (srel - base_addr)) | |
1018 | return bfd_reloc_outofrange; | |
1019 | } | |
1020 | ||
adde6300 AM |
1021 | if (srel & 1) |
1022 | return bfd_reloc_outofrange; | |
1023 | srel = srel >> 1; | |
1024 | x = bfd_get_16 (input_bfd, contents); | |
1025 | x = (x & 0xf0f0) | (srel & 0xf) | ((srel << 4) & 0xf00); | |
1026 | bfd_put_16 (input_bfd, x, contents); | |
1027 | break; | |
1028 | ||
28c9d252 NC |
1029 | case R_AVR_HI8_LDI_GS: |
1030 | use_stubs = (!htab->no_stubs); | |
1031 | /* Fall through. */ | |
adde6300 AM |
1032 | case R_AVR_HI8_LDI_PM: |
1033 | contents += rel->r_offset; | |
1034 | srel = (bfd_signed_vma) relocation + rel->r_addend; | |
28c9d252 NC |
1035 | |
1036 | if (use_stubs | |
1037 | && avr_stub_is_required_for_16_bit_reloc (srel - base_addr)) | |
1038 | { | |
1039 | bfd_vma old_srel = srel; | |
1040 | ||
1041 | /* We need to use the address of the stub instead. */ | |
1042 | srel = avr_get_stub_addr (srel, htab); | |
1043 | if (debug_stubs) | |
1044 | printf ("LD: Using jump stub (at 0x%x) with destination 0x%x for " | |
1045 | "reloc at address 0x%x.\n", | |
1046 | (unsigned int) srel, | |
1047 | (unsigned int) old_srel, | |
1048 | (unsigned int) reloc_addr); | |
1049 | ||
1050 | if (avr_stub_is_required_for_16_bit_reloc (srel - base_addr)) | |
1051 | return bfd_reloc_outofrange; | |
1052 | } | |
1053 | ||
adde6300 AM |
1054 | if (srel & 1) |
1055 | return bfd_reloc_outofrange; | |
1056 | srel = srel >> 1; | |
1057 | srel = (srel >> 8) & 0xff; | |
1058 | x = bfd_get_16 (input_bfd, contents); | |
1059 | x = (x & 0xf0f0) | (srel & 0xf) | ((srel << 4) & 0xf00); | |
1060 | bfd_put_16 (input_bfd, x, contents); | |
1061 | break; | |
1062 | ||
1063 | case R_AVR_HH8_LDI_PM: | |
1064 | contents += rel->r_offset; | |
1065 | srel = (bfd_signed_vma) relocation + rel->r_addend; | |
1066 | if (srel & 1) | |
1067 | return bfd_reloc_outofrange; | |
1068 | srel = srel >> 1; | |
1069 | srel = (srel >> 16) & 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 | ||
1075 | case R_AVR_LO8_LDI_PM_NEG: | |
1076 | contents += rel->r_offset; | |
1077 | srel = (bfd_signed_vma) relocation + rel->r_addend; | |
1078 | srel = -srel; | |
1079 | if (srel & 1) | |
1080 | return bfd_reloc_outofrange; | |
1081 | srel = srel >> 1; | |
1082 | x = bfd_get_16 (input_bfd, contents); | |
1083 | x = (x & 0xf0f0) | (srel & 0xf) | ((srel << 4) & 0xf00); | |
1084 | bfd_put_16 (input_bfd, x, contents); | |
1085 | break; | |
1086 | ||
1087 | case R_AVR_HI8_LDI_PM_NEG: | |
1088 | contents += rel->r_offset; | |
1089 | srel = (bfd_signed_vma) relocation + rel->r_addend; | |
1090 | srel = -srel; | |
1091 | if (srel & 1) | |
1092 | return bfd_reloc_outofrange; | |
1093 | srel = srel >> 1; | |
1094 | srel = (srel >> 8) & 0xff; | |
1095 | x = bfd_get_16 (input_bfd, contents); | |
1096 | x = (x & 0xf0f0) | (srel & 0xf) | ((srel << 4) & 0xf00); | |
1097 | bfd_put_16 (input_bfd, x, contents); | |
1098 | break; | |
1099 | ||
1100 | case R_AVR_HH8_LDI_PM_NEG: | |
1101 | contents += rel->r_offset; | |
1102 | srel = (bfd_signed_vma) relocation + rel->r_addend; | |
1103 | srel = -srel; | |
1104 | if (srel & 1) | |
1105 | return bfd_reloc_outofrange; | |
1106 | srel = srel >> 1; | |
1107 | srel = (srel >> 16) & 0xff; | |
1108 | x = bfd_get_16 (input_bfd, contents); | |
1109 | x = (x & 0xf0f0) | (srel & 0xf) | ((srel << 4) & 0xf00); | |
1110 | bfd_put_16 (input_bfd, x, contents); | |
1111 | break; | |
1112 | ||
1113 | case R_AVR_CALL: | |
1114 | contents += rel->r_offset; | |
1115 | srel = (bfd_signed_vma) relocation + rel->r_addend; | |
1116 | if (srel & 1) | |
1117 | return bfd_reloc_outofrange; | |
1118 | srel = srel >> 1; | |
1119 | x = bfd_get_16 (input_bfd, contents); | |
1120 | x |= ((srel & 0x10000) | ((srel << 3) & 0x1f00000)) >> 16; | |
1121 | bfd_put_16 (input_bfd, x, contents); | |
dc810e39 | 1122 | bfd_put_16 (input_bfd, (bfd_vma) srel & 0xffff, contents+2); |
adde6300 AM |
1123 | break; |
1124 | ||
28c9d252 NC |
1125 | case R_AVR_16_PM: |
1126 | use_stubs = (!htab->no_stubs); | |
1127 | contents += rel->r_offset; | |
1128 | srel = (bfd_signed_vma) relocation + rel->r_addend; | |
1129 | ||
1130 | if (use_stubs | |
1131 | && avr_stub_is_required_for_16_bit_reloc (srel - base_addr)) | |
1132 | { | |
1133 | bfd_vma old_srel = srel; | |
1134 | ||
1135 | /* We need to use the address of the stub instead. */ | |
1136 | srel = avr_get_stub_addr (srel,htab); | |
1137 | if (debug_stubs) | |
1138 | printf ("LD: Using jump stub (at 0x%x) with destination 0x%x for " | |
1139 | "reloc at address 0x%x.\n", | |
1140 | (unsigned int) srel, | |
1141 | (unsigned int) old_srel, | |
1142 | (unsigned int) reloc_addr); | |
1143 | ||
1144 | if (avr_stub_is_required_for_16_bit_reloc (srel - base_addr)) | |
1145 | return bfd_reloc_outofrange; | |
1146 | } | |
1147 | ||
1148 | if (srel & 1) | |
1149 | return bfd_reloc_outofrange; | |
1150 | srel = srel >> 1; | |
1151 | bfd_put_16 (input_bfd, (bfd_vma) srel &0x00ffff, contents); | |
1152 | break; | |
1153 | ||
adde6300 AM |
1154 | default: |
1155 | r = _bfd_final_link_relocate (howto, input_bfd, input_section, | |
1156 | contents, rel->r_offset, | |
1157 | relocation, rel->r_addend); | |
1158 | } | |
1159 | ||
1160 | return r; | |
1161 | } | |
1162 | ||
1163 | /* Relocate an AVR ELF section. */ | |
4cdc7696 | 1164 | |
b34976b6 | 1165 | static bfd_boolean |
4cdc7696 NC |
1166 | elf32_avr_relocate_section (bfd *output_bfd ATTRIBUTE_UNUSED, |
1167 | struct bfd_link_info *info, | |
1168 | bfd *input_bfd, | |
1169 | asection *input_section, | |
1170 | bfd_byte *contents, | |
1171 | Elf_Internal_Rela *relocs, | |
1172 | Elf_Internal_Sym *local_syms, | |
1173 | asection **local_sections) | |
adde6300 AM |
1174 | { |
1175 | Elf_Internal_Shdr * symtab_hdr; | |
1176 | struct elf_link_hash_entry ** sym_hashes; | |
1177 | Elf_Internal_Rela * rel; | |
1178 | Elf_Internal_Rela * relend; | |
28c9d252 | 1179 | struct elf32_avr_link_hash_table * htab = avr_link_hash_table (info); |
adde6300 | 1180 | |
4dfe6ac6 NC |
1181 | if (htab == NULL) |
1182 | return FALSE; | |
1183 | ||
adde6300 AM |
1184 | symtab_hdr = & elf_tdata (input_bfd)->symtab_hdr; |
1185 | sym_hashes = elf_sym_hashes (input_bfd); | |
1186 | relend = relocs + input_section->reloc_count; | |
1187 | ||
1188 | for (rel = relocs; rel < relend; rel ++) | |
1189 | { | |
1190 | reloc_howto_type * howto; | |
1191 | unsigned long r_symndx; | |
1192 | Elf_Internal_Sym * sym; | |
1193 | asection * sec; | |
1194 | struct elf_link_hash_entry * h; | |
1195 | bfd_vma relocation; | |
1196 | bfd_reloc_status_type r; | |
dfeffb9f | 1197 | const char * name; |
adde6300 AM |
1198 | int r_type; |
1199 | ||
1200 | r_type = ELF32_R_TYPE (rel->r_info); | |
1201 | r_symndx = ELF32_R_SYM (rel->r_info); | |
c7e2358a | 1202 | howto = elf_avr_howto_table + r_type; |
adde6300 AM |
1203 | h = NULL; |
1204 | sym = NULL; | |
1205 | sec = NULL; | |
1206 | ||
1207 | if (r_symndx < symtab_hdr->sh_info) | |
1208 | { | |
1209 | sym = local_syms + r_symndx; | |
1210 | sec = local_sections [r_symndx]; | |
8517fae7 | 1211 | relocation = _bfd_elf_rela_local_sym (output_bfd, sym, &sec, rel); |
adde6300 AM |
1212 | |
1213 | name = bfd_elf_string_from_elf_section | |
1214 | (input_bfd, symtab_hdr->sh_link, sym->st_name); | |
1215 | name = (name == NULL) ? bfd_section_name (input_bfd, sec) : name; | |
1216 | } | |
1217 | else | |
1218 | { | |
59c2e50f | 1219 | bfd_boolean unresolved_reloc, warned; |
adde6300 | 1220 | |
b2a8e766 AM |
1221 | RELOC_FOR_GLOBAL_SYMBOL (info, input_bfd, input_section, rel, |
1222 | r_symndx, symtab_hdr, sym_hashes, | |
1223 | h, sec, relocation, | |
1224 | unresolved_reloc, warned); | |
dfeffb9f L |
1225 | |
1226 | name = h->root.root.string; | |
adde6300 AM |
1227 | } |
1228 | ||
dbaa2011 | 1229 | if (sec != NULL && discarded_section (sec)) |
e4067dbb | 1230 | RELOC_AGAINST_DISCARDED_SECTION (info, input_bfd, input_section, |
545fd46b | 1231 | rel, 1, relend, howto, 0, contents); |
ab96bf03 AM |
1232 | |
1233 | if (info->relocatable) | |
1234 | continue; | |
1235 | ||
adde6300 | 1236 | r = avr_final_link_relocate (howto, input_bfd, input_section, |
28c9d252 | 1237 | contents, rel, relocation, htab); |
adde6300 AM |
1238 | |
1239 | if (r != bfd_reloc_ok) | |
1240 | { | |
1241 | const char * msg = (const char *) NULL; | |
1242 | ||
1243 | switch (r) | |
1244 | { | |
1245 | case bfd_reloc_overflow: | |
1246 | r = info->callbacks->reloc_overflow | |
dfeffb9f L |
1247 | (info, (h ? &h->root : NULL), |
1248 | name, howto->name, (bfd_vma) 0, | |
adde6300 AM |
1249 | input_bfd, input_section, rel->r_offset); |
1250 | break; | |
1251 | ||
1252 | case bfd_reloc_undefined: | |
1253 | r = info->callbacks->undefined_symbol | |
b34976b6 | 1254 | (info, name, input_bfd, input_section, rel->r_offset, TRUE); |
adde6300 AM |
1255 | break; |
1256 | ||
1257 | case bfd_reloc_outofrange: | |
1258 | msg = _("internal error: out of range error"); | |
1259 | break; | |
1260 | ||
1261 | case bfd_reloc_notsupported: | |
1262 | msg = _("internal error: unsupported relocation error"); | |
1263 | break; | |
1264 | ||
1265 | case bfd_reloc_dangerous: | |
1266 | msg = _("internal error: dangerous relocation"); | |
1267 | break; | |
1268 | ||
1269 | default: | |
1270 | msg = _("internal error: unknown error"); | |
1271 | break; | |
1272 | } | |
1273 | ||
1274 | if (msg) | |
1275 | r = info->callbacks->warning | |
1276 | (info, msg, name, input_bfd, input_section, rel->r_offset); | |
1277 | ||
1278 | if (! r) | |
b34976b6 | 1279 | return FALSE; |
adde6300 AM |
1280 | } |
1281 | } | |
1282 | ||
b34976b6 | 1283 | return TRUE; |
adde6300 AM |
1284 | } |
1285 | ||
1286 | /* The final processing done just before writing out a AVR ELF object | |
1287 | file. This gets the AVR architecture right based on the machine | |
1288 | number. */ | |
1289 | ||
1290 | static void | |
4cdc7696 NC |
1291 | bfd_elf_avr_final_write_processing (bfd *abfd, |
1292 | bfd_boolean linker ATTRIBUTE_UNUSED) | |
adde6300 AM |
1293 | { |
1294 | unsigned long val; | |
1295 | ||
1296 | switch (bfd_get_mach (abfd)) | |
1297 | { | |
1298 | default: | |
1299 | case bfd_mach_avr2: | |
1300 | val = E_AVR_MACH_AVR2; | |
1301 | break; | |
1302 | ||
1303 | case bfd_mach_avr1: | |
1304 | val = E_AVR_MACH_AVR1; | |
1305 | break; | |
1306 | ||
7b21ac3f EW |
1307 | case bfd_mach_avr25: |
1308 | val = E_AVR_MACH_AVR25; | |
28b02751 | 1309 | break; |
7b21ac3f | 1310 | |
adde6300 AM |
1311 | case bfd_mach_avr3: |
1312 | val = E_AVR_MACH_AVR3; | |
1313 | break; | |
1314 | ||
7b21ac3f EW |
1315 | case bfd_mach_avr31: |
1316 | val = E_AVR_MACH_AVR31; | |
28b02751 | 1317 | break; |
7b21ac3f EW |
1318 | |
1319 | case bfd_mach_avr35: | |
1320 | val = E_AVR_MACH_AVR35; | |
28b02751 | 1321 | break; |
7b21ac3f | 1322 | |
adde6300 AM |
1323 | case bfd_mach_avr4: |
1324 | val = E_AVR_MACH_AVR4; | |
1325 | break; | |
1326 | ||
65aa24b6 NC |
1327 | case bfd_mach_avr5: |
1328 | val = E_AVR_MACH_AVR5; | |
1329 | break; | |
28c9d252 | 1330 | |
7b21ac3f EW |
1331 | case bfd_mach_avr51: |
1332 | val = E_AVR_MACH_AVR51; | |
1333 | break; | |
1334 | ||
28c9d252 NC |
1335 | case bfd_mach_avr6: |
1336 | val = E_AVR_MACH_AVR6; | |
1337 | break; | |
8cc66334 EW |
1338 | |
1339 | case bfd_mach_avrxmega1: | |
1340 | val = E_AVR_MACH_XMEGA1; | |
1341 | break; | |
1342 | ||
1343 | case bfd_mach_avrxmega2: | |
1344 | val = E_AVR_MACH_XMEGA2; | |
1345 | break; | |
1346 | ||
1347 | case bfd_mach_avrxmega3: | |
1348 | val = E_AVR_MACH_XMEGA3; | |
1349 | break; | |
1350 | ||
1351 | case bfd_mach_avrxmega4: | |
1352 | val = E_AVR_MACH_XMEGA4; | |
1353 | break; | |
1354 | ||
1355 | case bfd_mach_avrxmega5: | |
1356 | val = E_AVR_MACH_XMEGA5; | |
1357 | break; | |
1358 | ||
1359 | case bfd_mach_avrxmega6: | |
1360 | val = E_AVR_MACH_XMEGA6; | |
1361 | break; | |
1362 | ||
1363 | case bfd_mach_avrxmega7: | |
1364 | val = E_AVR_MACH_XMEGA7; | |
1365 | break; | |
adde6300 AM |
1366 | } |
1367 | ||
1368 | elf_elfheader (abfd)->e_machine = EM_AVR; | |
1369 | elf_elfheader (abfd)->e_flags &= ~ EF_AVR_MACH; | |
1370 | elf_elfheader (abfd)->e_flags |= val; | |
df406460 | 1371 | elf_elfheader (abfd)->e_flags |= EF_AVR_LINKRELAX_PREPARED; |
adde6300 AM |
1372 | } |
1373 | ||
1374 | /* Set the right machine number. */ | |
1375 | ||
b34976b6 | 1376 | static bfd_boolean |
4cdc7696 | 1377 | elf32_avr_object_p (bfd *abfd) |
adde6300 | 1378 | { |
dc810e39 | 1379 | unsigned int e_set = bfd_mach_avr2; |
4cdc7696 | 1380 | |
aa4f99bb AO |
1381 | if (elf_elfheader (abfd)->e_machine == EM_AVR |
1382 | || elf_elfheader (abfd)->e_machine == EM_AVR_OLD) | |
adde6300 AM |
1383 | { |
1384 | int e_mach = elf_elfheader (abfd)->e_flags & EF_AVR_MACH; | |
4cdc7696 | 1385 | |
adde6300 AM |
1386 | switch (e_mach) |
1387 | { | |
1388 | default: | |
1389 | case E_AVR_MACH_AVR2: | |
1390 | e_set = bfd_mach_avr2; | |
1391 | break; | |
1392 | ||
1393 | case E_AVR_MACH_AVR1: | |
1394 | e_set = bfd_mach_avr1; | |
1395 | break; | |
1396 | ||
7b21ac3f EW |
1397 | case E_AVR_MACH_AVR25: |
1398 | e_set = bfd_mach_avr25; | |
1399 | break; | |
1400 | ||
adde6300 AM |
1401 | case E_AVR_MACH_AVR3: |
1402 | e_set = bfd_mach_avr3; | |
1403 | break; | |
1404 | ||
7b21ac3f EW |
1405 | case E_AVR_MACH_AVR31: |
1406 | e_set = bfd_mach_avr31; | |
1407 | break; | |
1408 | ||
1409 | case E_AVR_MACH_AVR35: | |
1410 | e_set = bfd_mach_avr35; | |
1411 | break; | |
1412 | ||
adde6300 AM |
1413 | case E_AVR_MACH_AVR4: |
1414 | e_set = bfd_mach_avr4; | |
1415 | break; | |
65aa24b6 NC |
1416 | |
1417 | case E_AVR_MACH_AVR5: | |
1418 | e_set = bfd_mach_avr5; | |
1419 | break; | |
28c9d252 | 1420 | |
7b21ac3f EW |
1421 | case E_AVR_MACH_AVR51: |
1422 | e_set = bfd_mach_avr51; | |
1423 | break; | |
1424 | ||
28c9d252 NC |
1425 | case E_AVR_MACH_AVR6: |
1426 | e_set = bfd_mach_avr6; | |
1427 | break; | |
8cc66334 EW |
1428 | |
1429 | case E_AVR_MACH_XMEGA1: | |
1430 | e_set = bfd_mach_avrxmega1; | |
1431 | break; | |
1432 | ||
1433 | case E_AVR_MACH_XMEGA2: | |
1434 | e_set = bfd_mach_avrxmega2; | |
1435 | break; | |
1436 | ||
1437 | case E_AVR_MACH_XMEGA3: | |
1438 | e_set = bfd_mach_avrxmega3; | |
1439 | break; | |
1440 | ||
1441 | case E_AVR_MACH_XMEGA4: | |
1442 | e_set = bfd_mach_avrxmega4; | |
1443 | break; | |
1444 | ||
1445 | case E_AVR_MACH_XMEGA5: | |
1446 | e_set = bfd_mach_avrxmega5; | |
1447 | break; | |
1448 | ||
1449 | case E_AVR_MACH_XMEGA6: | |
1450 | e_set = bfd_mach_avrxmega6; | |
1451 | break; | |
1452 | ||
1453 | case E_AVR_MACH_XMEGA7: | |
1454 | e_set = bfd_mach_avrxmega7; | |
1455 | break; | |
adde6300 AM |
1456 | } |
1457 | } | |
1458 | return bfd_default_set_arch_mach (abfd, bfd_arch_avr, | |
1459 | e_set); | |
1460 | } | |
1461 | ||
df406460 | 1462 | |
4cdc7696 NC |
1463 | /* Delete some bytes from a section while changing the size of an instruction. |
1464 | The parameter "addr" denotes the section-relative offset pointing just | |
1465 | behind the shrinked instruction. "addr+count" point at the first | |
1466 | byte just behind the original unshrinked instruction. */ | |
1467 | ||
1468 | static bfd_boolean | |
1469 | elf32_avr_relax_delete_bytes (bfd *abfd, | |
73160847 | 1470 | asection *sec, |
4cdc7696 | 1471 | bfd_vma addr, |
73160847 | 1472 | int count) |
4cdc7696 NC |
1473 | { |
1474 | Elf_Internal_Shdr *symtab_hdr; | |
1475 | unsigned int sec_shndx; | |
1476 | bfd_byte *contents; | |
1477 | Elf_Internal_Rela *irel, *irelend; | |
4cdc7696 NC |
1478 | Elf_Internal_Sym *isym; |
1479 | Elf_Internal_Sym *isymbuf = NULL; | |
4cdc7696 NC |
1480 | bfd_vma toaddr; |
1481 | struct elf_link_hash_entry **sym_hashes; | |
1482 | struct elf_link_hash_entry **end_hashes; | |
1483 | unsigned int symcount; | |
1484 | ||
1485 | symtab_hdr = &elf_tdata (abfd)->symtab_hdr; | |
1486 | sec_shndx = _bfd_elf_section_from_bfd_section (abfd, sec); | |
1487 | contents = elf_section_data (sec)->this_hdr.contents; | |
1488 | ||
4cdc7696 NC |
1489 | toaddr = sec->size; |
1490 | ||
1491 | irel = elf_section_data (sec)->relocs; | |
1492 | irelend = irel + sec->reloc_count; | |
1493 | ||
1494 | /* Actually delete the bytes. */ | |
1495 | if (toaddr - addr - count > 0) | |
1496 | memmove (contents + addr, contents + addr + count, | |
1497 | (size_t) (toaddr - addr - count)); | |
1498 | sec->size -= count; | |
1499 | ||
73160847 | 1500 | /* Adjust all the reloc addresses. */ |
4cdc7696 NC |
1501 | for (irel = elf_section_data (sec)->relocs; irel < irelend; irel++) |
1502 | { | |
4cdc7696 | 1503 | bfd_vma old_reloc_address; |
4cdc7696 NC |
1504 | |
1505 | old_reloc_address = (sec->output_section->vma | |
1506 | + sec->output_offset + irel->r_offset); | |
4cdc7696 NC |
1507 | |
1508 | /* Get the new reloc address. */ | |
1509 | if ((irel->r_offset > addr | |
1510 | && irel->r_offset < toaddr)) | |
1511 | { | |
28c9d252 | 1512 | if (debug_relax) |
4cdc7696 NC |
1513 | printf ("Relocation at address 0x%x needs to be moved.\n" |
1514 | "Old section offset: 0x%x, New section offset: 0x%x \n", | |
1515 | (unsigned int) old_reloc_address, | |
1516 | (unsigned int) irel->r_offset, | |
1517 | (unsigned int) ((irel->r_offset) - count)); | |
1518 | ||
1519 | irel->r_offset -= count; | |
1520 | } | |
1521 | ||
73160847 | 1522 | } |
4cdc7696 | 1523 | |
73160847 NC |
1524 | /* The reloc's own addresses are now ok. However, we need to readjust |
1525 | the reloc's addend, i.e. the reloc's value if two conditions are met: | |
1526 | 1.) the reloc is relative to a symbol in this section that | |
1527 | is located in front of the shrinked instruction | |
28c9d252 NC |
1528 | 2.) symbol plus addend end up behind the shrinked instruction. |
1529 | ||
73160847 NC |
1530 | The most common case where this happens are relocs relative to |
1531 | the section-start symbol. | |
28c9d252 | 1532 | |
73160847 NC |
1533 | This step needs to be done for all of the sections of the bfd. */ |
1534 | ||
1535 | { | |
1536 | struct bfd_section *isec; | |
1537 | ||
1538 | for (isec = abfd->sections; isec; isec = isec->next) | |
1539 | { | |
1540 | bfd_vma symval; | |
1541 | bfd_vma shrinked_insn_address; | |
1542 | ||
a1c7aafb NC |
1543 | if (isec->reloc_count == 0) |
1544 | continue; | |
1545 | ||
73160847 NC |
1546 | shrinked_insn_address = (sec->output_section->vma |
1547 | + sec->output_offset + addr - count); | |
1548 | ||
a1c7aafb NC |
1549 | irel = elf_section_data (isec)->relocs; |
1550 | /* PR 12161: Read in the relocs for this section if necessary. */ | |
1551 | if (irel == NULL) | |
6aa82b64 | 1552 | irel = _bfd_elf_link_read_relocs (abfd, isec, NULL, NULL, TRUE); |
a1c7aafb NC |
1553 | |
1554 | for (irelend = irel + isec->reloc_count; | |
73160847 NC |
1555 | irel < irelend; |
1556 | irel++) | |
1557 | { | |
28c9d252 | 1558 | /* Read this BFD's local symbols if we haven't done |
73160847 NC |
1559 | so already. */ |
1560 | if (isymbuf == NULL && symtab_hdr->sh_info != 0) | |
1561 | { | |
1562 | isymbuf = (Elf_Internal_Sym *) symtab_hdr->contents; | |
1563 | if (isymbuf == NULL) | |
1564 | isymbuf = bfd_elf_get_elf_syms (abfd, symtab_hdr, | |
1565 | symtab_hdr->sh_info, 0, | |
1566 | NULL, NULL, NULL); | |
1567 | if (isymbuf == NULL) | |
1568 | return FALSE; | |
1569 | } | |
1570 | ||
1571 | /* Get the value of the symbol referred to by the reloc. */ | |
1572 | if (ELF32_R_SYM (irel->r_info) < symtab_hdr->sh_info) | |
1573 | { | |
1574 | /* A local symbol. */ | |
73160847 NC |
1575 | asection *sym_sec; |
1576 | ||
1577 | isym = isymbuf + ELF32_R_SYM (irel->r_info); | |
1578 | sym_sec = bfd_section_from_elf_index (abfd, isym->st_shndx); | |
1579 | symval = isym->st_value; | |
1580 | /* If the reloc is absolute, it will not have | |
1581 | a symbol or section associated with it. */ | |
1582 | if (sym_sec == sec) | |
28c9d252 | 1583 | { |
73160847 NC |
1584 | symval += sym_sec->output_section->vma |
1585 | + sym_sec->output_offset; | |
4cdc7696 | 1586 | |
28c9d252 | 1587 | if (debug_relax) |
73160847 NC |
1588 | printf ("Checking if the relocation's " |
1589 | "addend needs corrections.\n" | |
1590 | "Address of anchor symbol: 0x%x \n" | |
1591 | "Address of relocation target: 0x%x \n" | |
1592 | "Address of relaxed insn: 0x%x \n", | |
1593 | (unsigned int) symval, | |
1594 | (unsigned int) (symval + irel->r_addend), | |
1595 | (unsigned int) shrinked_insn_address); | |
1596 | ||
1597 | if (symval <= shrinked_insn_address | |
1598 | && (symval + irel->r_addend) > shrinked_insn_address) | |
1599 | { | |
1600 | irel->r_addend -= count; | |
1601 | ||
28c9d252 | 1602 | if (debug_relax) |
73160847 NC |
1603 | printf ("Relocation's addend needed to be fixed \n"); |
1604 | } | |
4cdc7696 | 1605 | } |
73160847 | 1606 | /* else...Reference symbol is absolute. No adjustment needed. */ |
28c9d252 NC |
1607 | } |
1608 | /* else...Reference symbol is extern. No need for adjusting | |
73160847 | 1609 | the addend. */ |
28c9d252 | 1610 | } |
73160847 NC |
1611 | } |
1612 | } | |
4cdc7696 NC |
1613 | |
1614 | /* Adjust the local symbols defined in this section. */ | |
1615 | isym = (Elf_Internal_Sym *) symtab_hdr->contents; | |
12123067 NC |
1616 | /* Fix PR 9841, there may be no local symbols. */ |
1617 | if (isym != NULL) | |
4cdc7696 | 1618 | { |
12123067 NC |
1619 | Elf_Internal_Sym *isymend; |
1620 | ||
1621 | isymend = isym + symtab_hdr->sh_info; | |
1622 | for (; isym < isymend; isym++) | |
1623 | { | |
1624 | if (isym->st_shndx == sec_shndx | |
1625 | && isym->st_value > addr | |
1626 | && isym->st_value < toaddr) | |
1627 | isym->st_value -= count; | |
1628 | } | |
4cdc7696 NC |
1629 | } |
1630 | ||
1631 | /* Now adjust the global symbols defined in this section. */ | |
1632 | symcount = (symtab_hdr->sh_size / sizeof (Elf32_External_Sym) | |
1633 | - symtab_hdr->sh_info); | |
1634 | sym_hashes = elf_sym_hashes (abfd); | |
1635 | end_hashes = sym_hashes + symcount; | |
1636 | for (; sym_hashes < end_hashes; sym_hashes++) | |
1637 | { | |
1638 | struct elf_link_hash_entry *sym_hash = *sym_hashes; | |
1639 | if ((sym_hash->root.type == bfd_link_hash_defined | |
1640 | || sym_hash->root.type == bfd_link_hash_defweak) | |
1641 | && sym_hash->root.u.def.section == sec | |
1642 | && sym_hash->root.u.def.value > addr | |
1643 | && sym_hash->root.u.def.value < toaddr) | |
1644 | { | |
1645 | sym_hash->root.u.def.value -= count; | |
1646 | } | |
1647 | } | |
1648 | ||
1649 | return TRUE; | |
1650 | } | |
1651 | ||
df406460 NC |
1652 | /* This function handles relaxing for the avr. |
1653 | Many important relaxing opportunities within functions are already | |
1654 | realized by the compiler itself. | |
1655 | Here we try to replace call (4 bytes) -> rcall (2 bytes) | |
4cdc7696 NC |
1656 | and jump -> rjmp (safes also 2 bytes). |
1657 | As well we now optimize seqences of | |
df406460 NC |
1658 | - call/rcall function |
1659 | - ret | |
1660 | to yield | |
1661 | - jmp/rjmp function | |
1662 | - ret | |
1663 | . In case that within a sequence | |
1664 | - jmp/rjmp label | |
1665 | - ret | |
1666 | the ret could no longer be reached it is optimized away. In order | |
1667 | to check if the ret is no longer needed, it is checked that the ret's address | |
1668 | is not the target of a branch or jump within the same section, it is checked | |
1669 | that there is no skip instruction before the jmp/rjmp and that there | |
1670 | is no local or global label place at the address of the ret. | |
4cdc7696 | 1671 | |
df406460 | 1672 | We refrain from relaxing within sections ".vectors" and |
4cdc7696 | 1673 | ".jumptables" in order to maintain the position of the instructions. |
df406460 | 1674 | There, however, we substitute jmp/call by a sequence rjmp,nop/rcall,nop |
4cdc7696 | 1675 | if possible. (In future one could possibly use the space of the nop |
df406460 NC |
1676 | for the first instruction of the irq service function. |
1677 | ||
1678 | The .jumptables sections is meant to be used for a future tablejump variant | |
1679 | for the devices with 3-byte program counter where the table itself | |
4cdc7696 | 1680 | contains 4-byte jump instructions whose relative offset must not |
df406460 | 1681 | be changed. */ |
4cdc7696 | 1682 | |
28c9d252 | 1683 | static bfd_boolean |
4cdc7696 NC |
1684 | elf32_avr_relax_section (bfd *abfd, |
1685 | asection *sec, | |
df406460 NC |
1686 | struct bfd_link_info *link_info, |
1687 | bfd_boolean *again) | |
1688 | { | |
1689 | Elf_Internal_Shdr *symtab_hdr; | |
1690 | Elf_Internal_Rela *internal_relocs; | |
1691 | Elf_Internal_Rela *irel, *irelend; | |
1692 | bfd_byte *contents = NULL; | |
1693 | Elf_Internal_Sym *isymbuf = NULL; | |
28c9d252 NC |
1694 | struct elf32_avr_link_hash_table *htab; |
1695 | ||
526f25b2 | 1696 | /* If 'shrinkable' is FALSE, do not shrink by deleting bytes while |
68ffbac6 L |
1697 | relaxing. Such shrinking can cause issues for the sections such |
1698 | as .vectors and .jumptables. Instead the unused bytes should be | |
526f25b2 EW |
1699 | filled with nop instructions. */ |
1700 | bfd_boolean shrinkable = TRUE; | |
1701 | ||
1702 | if (!strcmp (sec->name,".vectors") | |
1703 | || !strcmp (sec->name,".jumptables")) | |
1704 | shrinkable = FALSE; | |
1705 | ||
c8a1f254 NS |
1706 | if (link_info->relocatable) |
1707 | (*link_info->callbacks->einfo) | |
1708 | (_("%P%F: --relax and -r may not be used together\n")); | |
1709 | ||
28c9d252 | 1710 | htab = avr_link_hash_table (link_info); |
64ee10b6 NC |
1711 | if (htab == NULL) |
1712 | return FALSE; | |
df406460 NC |
1713 | |
1714 | /* Assume nothing changes. */ | |
1715 | *again = FALSE; | |
1716 | ||
28c9d252 NC |
1717 | if ((!htab->no_stubs) && (sec == htab->stub_sec)) |
1718 | { | |
1719 | /* We are just relaxing the stub section. | |
1720 | Let's calculate the size needed again. */ | |
1721 | bfd_size_type last_estimated_stub_section_size = htab->stub_sec->size; | |
1722 | ||
1723 | if (debug_relax) | |
1724 | printf ("Relaxing the stub section. Size prior to this pass: %i\n", | |
1725 | (int) last_estimated_stub_section_size); | |
1726 | ||
1727 | elf32_avr_size_stubs (htab->stub_sec->output_section->owner, | |
1728 | link_info, FALSE); | |
1729 | ||
1730 | /* Check if the number of trampolines changed. */ | |
1731 | if (last_estimated_stub_section_size != htab->stub_sec->size) | |
1732 | *again = TRUE; | |
1733 | ||
1734 | if (debug_relax) | |
1735 | printf ("Size of stub section after this pass: %i\n", | |
1736 | (int) htab->stub_sec->size); | |
1737 | ||
1738 | return TRUE; | |
1739 | } | |
1740 | ||
df406460 NC |
1741 | /* We don't have to do anything for a relocatable link, if |
1742 | this section does not have relocs, or if this is not a | |
1743 | code section. */ | |
1744 | if (link_info->relocatable | |
1745 | || (sec->flags & SEC_RELOC) == 0 | |
1746 | || sec->reloc_count == 0 | |
1747 | || (sec->flags & SEC_CODE) == 0) | |
1748 | return TRUE; | |
4cdc7696 | 1749 | |
df406460 NC |
1750 | /* Check if the object file to relax uses internal symbols so that we |
1751 | could fix up the relocations. */ | |
df406460 NC |
1752 | if (!(elf_elfheader (abfd)->e_flags & EF_AVR_LINKRELAX_PREPARED)) |
1753 | return TRUE; | |
df406460 NC |
1754 | |
1755 | symtab_hdr = &elf_tdata (abfd)->symtab_hdr; | |
1756 | ||
1757 | /* Get a copy of the native relocations. */ | |
1758 | internal_relocs = (_bfd_elf_link_read_relocs | |
4cdc7696 | 1759 | (abfd, sec, NULL, NULL, link_info->keep_memory)); |
df406460 NC |
1760 | if (internal_relocs == NULL) |
1761 | goto error_return; | |
1762 | ||
df406460 NC |
1763 | /* Walk through the relocs looking for relaxing opportunities. */ |
1764 | irelend = internal_relocs + sec->reloc_count; | |
1765 | for (irel = internal_relocs; irel < irelend; irel++) | |
1766 | { | |
1767 | bfd_vma symval; | |
1768 | ||
4cdc7696 | 1769 | if ( ELF32_R_TYPE (irel->r_info) != R_AVR_13_PCREL |
91d6fa6a NC |
1770 | && ELF32_R_TYPE (irel->r_info) != R_AVR_7_PCREL |
1771 | && ELF32_R_TYPE (irel->r_info) != R_AVR_CALL) | |
df406460 | 1772 | continue; |
4cdc7696 | 1773 | |
df406460 NC |
1774 | /* Get the section contents if we haven't done so already. */ |
1775 | if (contents == NULL) | |
1776 | { | |
1777 | /* Get cached copy if it exists. */ | |
1778 | if (elf_section_data (sec)->this_hdr.contents != NULL) | |
1779 | contents = elf_section_data (sec)->this_hdr.contents; | |
1780 | else | |
1781 | { | |
1782 | /* Go get them off disk. */ | |
4cdc7696 | 1783 | if (! bfd_malloc_and_get_section (abfd, sec, &contents)) |
df406460 NC |
1784 | goto error_return; |
1785 | } | |
1786 | } | |
1787 | ||
91d6fa6a | 1788 | /* Read this BFD's local symbols if we haven't done so already. */ |
df406460 NC |
1789 | if (isymbuf == NULL && symtab_hdr->sh_info != 0) |
1790 | { | |
1791 | isymbuf = (Elf_Internal_Sym *) symtab_hdr->contents; | |
1792 | if (isymbuf == NULL) | |
1793 | isymbuf = bfd_elf_get_elf_syms (abfd, symtab_hdr, | |
1794 | symtab_hdr->sh_info, 0, | |
1795 | NULL, NULL, NULL); | |
1796 | if (isymbuf == NULL) | |
1797 | goto error_return; | |
1798 | } | |
1799 | ||
1800 | ||
1801 | /* Get the value of the symbol referred to by the reloc. */ | |
1802 | if (ELF32_R_SYM (irel->r_info) < symtab_hdr->sh_info) | |
1803 | { | |
1804 | /* A local symbol. */ | |
1805 | Elf_Internal_Sym *isym; | |
1806 | asection *sym_sec; | |
1807 | ||
1808 | isym = isymbuf + ELF32_R_SYM (irel->r_info); | |
1809 | sym_sec = bfd_section_from_elf_index (abfd, isym->st_shndx); | |
1810 | symval = isym->st_value; | |
1811 | /* If the reloc is absolute, it will not have | |
1812 | a symbol or section associated with it. */ | |
1813 | if (sym_sec) | |
1814 | symval += sym_sec->output_section->vma | |
1815 | + sym_sec->output_offset; | |
1816 | } | |
1817 | else | |
1818 | { | |
1819 | unsigned long indx; | |
1820 | struct elf_link_hash_entry *h; | |
1821 | ||
1822 | /* An external symbol. */ | |
1823 | indx = ELF32_R_SYM (irel->r_info) - symtab_hdr->sh_info; | |
1824 | h = elf_sym_hashes (abfd)[indx]; | |
1825 | BFD_ASSERT (h != NULL); | |
1826 | if (h->root.type != bfd_link_hash_defined | |
1827 | && h->root.type != bfd_link_hash_defweak) | |
4cdc7696 NC |
1828 | /* This appears to be a reference to an undefined |
1829 | symbol. Just ignore it--it will be caught by the | |
1830 | regular reloc processing. */ | |
1831 | continue; | |
1832 | ||
df406460 NC |
1833 | symval = (h->root.u.def.value |
1834 | + h->root.u.def.section->output_section->vma | |
1835 | + h->root.u.def.section->output_offset); | |
1836 | } | |
1837 | ||
1838 | /* For simplicity of coding, we are going to modify the section | |
1839 | contents, the section relocs, and the BFD symbol table. We | |
1840 | must tell the rest of the code not to free up this | |
1841 | information. It would be possible to instead create a table | |
1842 | of changes which have to be made, as is done in coff-mips.c; | |
1843 | that would be more work, but would require less memory when | |
1844 | the linker is run. */ | |
1845 | switch (ELF32_R_TYPE (irel->r_info)) | |
1846 | { | |
91d6fa6a NC |
1847 | /* Try to turn a 22-bit absolute call/jump into an 13-bit |
1848 | pc-relative rcall/rjmp. */ | |
1849 | case R_AVR_CALL: | |
df406460 NC |
1850 | { |
1851 | bfd_vma value = symval + irel->r_addend; | |
1852 | bfd_vma dot, gap; | |
1853 | int distance_short_enough = 0; | |
1854 | ||
1855 | /* Get the address of this instruction. */ | |
1856 | dot = (sec->output_section->vma | |
1857 | + sec->output_offset + irel->r_offset); | |
1858 | ||
1859 | /* Compute the distance from this insn to the branch target. */ | |
1860 | gap = value - dot; | |
1861 | ||
526f25b2 EW |
1862 | /* Check if the gap falls in the range that can be accommodated |
1863 | in 13bits signed (It is 12bits when encoded, as we deal with | |
1864 | word addressing). */ | |
1865 | if (!shrinkable && ((int) gap >= -4096 && (int) gap <= 4095)) | |
1866 | distance_short_enough = 1; | |
1867 | /* If shrinkable, then we can check for a range of distance which | |
1868 | is two bytes farther on both the directions because the call | |
68ffbac6 | 1869 | or jump target will be closer by two bytes after the |
526f25b2 EW |
1870 | relaxation. */ |
1871 | else if (shrinkable && ((int) gap >= -4094 && (int) gap <= 4097)) | |
df406460 NC |
1872 | distance_short_enough = 1; |
1873 | ||
1874 | /* Here we handle the wrap-around case. E.g. for a 16k device | |
4cdc7696 | 1875 | we could use a rjmp to jump from address 0x100 to 0x3d00! |
df406460 NC |
1876 | In order to make this work properly, we need to fill the |
1877 | vaiable avr_pc_wrap_around with the appropriate value. | |
1878 | I.e. 0x4000 for a 16k device. */ | |
1879 | { | |
91d6fa6a NC |
1880 | /* Shrinking the code size makes the gaps larger in the |
1881 | case of wrap-arounds. So we use a heuristical safety | |
1882 | margin to avoid that during relax the distance gets | |
1883 | again too large for the short jumps. Let's assume | |
1884 | a typical code-size reduction due to relax for a | |
1885 | 16k device of 600 bytes. So let's use twice the | |
1886 | typical value as safety margin. */ | |
1887 | int rgap; | |
1888 | int safety_margin; | |
1889 | ||
1890 | int assumed_shrink = 600; | |
1891 | if (avr_pc_wrap_around > 0x4000) | |
1892 | assumed_shrink = 900; | |
1893 | ||
1894 | safety_margin = 2 * assumed_shrink; | |
1895 | ||
1896 | rgap = avr_relative_distance_considering_wrap_around (gap); | |
1897 | ||
1898 | if (rgap >= (-4092 + safety_margin) | |
1899 | && rgap <= (4094 - safety_margin)) | |
1900 | distance_short_enough = 1; | |
4cdc7696 | 1901 | } |
df406460 NC |
1902 | |
1903 | if (distance_short_enough) | |
1904 | { | |
1905 | unsigned char code_msb; | |
1906 | unsigned char code_lsb; | |
1907 | ||
28c9d252 | 1908 | if (debug_relax) |
df406460 NC |
1909 | printf ("shrinking jump/call instruction at address 0x%x" |
1910 | " in section %s\n\n", | |
1911 | (int) dot, sec->name); | |
1912 | ||
1913 | /* Note that we've changed the relocs, section contents, | |
1914 | etc. */ | |
1915 | elf_section_data (sec)->relocs = internal_relocs; | |
1916 | elf_section_data (sec)->this_hdr.contents = contents; | |
1917 | symtab_hdr->contents = (unsigned char *) isymbuf; | |
1918 | ||
1919 | /* Get the instruction code for relaxing. */ | |
1920 | code_lsb = bfd_get_8 (abfd, contents + irel->r_offset); | |
1921 | code_msb = bfd_get_8 (abfd, contents + irel->r_offset + 1); | |
1922 | ||
1923 | /* Mask out the relocation bits. */ | |
1924 | code_msb &= 0x94; | |
1925 | code_lsb &= 0x0E; | |
1926 | if (code_msb == 0x94 && code_lsb == 0x0E) | |
1927 | { | |
1928 | /* we are changing call -> rcall . */ | |
1929 | bfd_put_8 (abfd, 0x00, contents + irel->r_offset); | |
1930 | bfd_put_8 (abfd, 0xD0, contents + irel->r_offset + 1); | |
1931 | } | |
1932 | else if (code_msb == 0x94 && code_lsb == 0x0C) | |
1933 | { | |
1934 | /* we are changeing jump -> rjmp. */ | |
1935 | bfd_put_8 (abfd, 0x00, contents + irel->r_offset); | |
1936 | bfd_put_8 (abfd, 0xC0, contents + irel->r_offset + 1); | |
1937 | } | |
4cdc7696 | 1938 | else |
df406460 NC |
1939 | abort (); |
1940 | ||
1941 | /* Fix the relocation's type. */ | |
1942 | irel->r_info = ELF32_R_INFO (ELF32_R_SYM (irel->r_info), | |
1943 | R_AVR_13_PCREL); | |
1944 | ||
526f25b2 | 1945 | /* We should not modify the ordering if 'shrinkable' is |
68ffbac6 | 1946 | FALSE. */ |
526f25b2 | 1947 | if (!shrinkable) |
df406460 NC |
1948 | { |
1949 | /* Let's insert a nop. */ | |
1950 | bfd_put_8 (abfd, 0x00, contents + irel->r_offset + 2); | |
1951 | bfd_put_8 (abfd, 0x00, contents + irel->r_offset + 3); | |
1952 | } | |
1953 | else | |
1954 | { | |
1955 | /* Delete two bytes of data. */ | |
1956 | if (!elf32_avr_relax_delete_bytes (abfd, sec, | |
1957 | irel->r_offset + 2, 2)) | |
1958 | goto error_return; | |
1959 | ||
1960 | /* That will change things, so, we should relax again. | |
1961 | Note that this is not required, and it may be slow. */ | |
1962 | *again = TRUE; | |
1963 | } | |
1964 | } | |
1965 | } | |
4cdc7696 | 1966 | |
df406460 NC |
1967 | default: |
1968 | { | |
1969 | unsigned char code_msb; | |
1970 | unsigned char code_lsb; | |
1971 | bfd_vma dot; | |
1972 | ||
1973 | code_msb = bfd_get_8 (abfd, contents + irel->r_offset + 1); | |
1974 | code_lsb = bfd_get_8 (abfd, contents + irel->r_offset + 0); | |
1975 | ||
1976 | /* Get the address of this instruction. */ | |
1977 | dot = (sec->output_section->vma | |
1978 | + sec->output_offset + irel->r_offset); | |
4cdc7696 NC |
1979 | |
1980 | /* Here we look for rcall/ret or call/ret sequences that could be | |
28c9d252 NC |
1981 | safely replaced by rjmp/ret or jmp/ret. */ |
1982 | if (((code_msb & 0xf0) == 0xd0) | |
1983 | && avr_replace_call_ret_sequences) | |
df406460 NC |
1984 | { |
1985 | /* This insn is a rcall. */ | |
1986 | unsigned char next_insn_msb = 0; | |
1987 | unsigned char next_insn_lsb = 0; | |
1988 | ||
1989 | if (irel->r_offset + 3 < sec->size) | |
1990 | { | |
4cdc7696 | 1991 | next_insn_msb = |
91d6fa6a | 1992 | bfd_get_8 (abfd, contents + irel->r_offset + 3); |
4cdc7696 | 1993 | next_insn_lsb = |
91d6fa6a | 1994 | bfd_get_8 (abfd, contents + irel->r_offset + 2); |
df406460 | 1995 | } |
4cdc7696 NC |
1996 | |
1997 | if ((0x95 == next_insn_msb) && (0x08 == next_insn_lsb)) | |
df406460 NC |
1998 | { |
1999 | /* The next insn is a ret. We now convert the rcall insn | |
2000 | into a rjmp instruction. */ | |
df406460 NC |
2001 | code_msb &= 0xef; |
2002 | bfd_put_8 (abfd, code_msb, contents + irel->r_offset + 1); | |
28c9d252 | 2003 | if (debug_relax) |
df406460 NC |
2004 | printf ("converted rcall/ret sequence at address 0x%x" |
2005 | " into rjmp/ret sequence. Section is %s\n\n", | |
2006 | (int) dot, sec->name); | |
2007 | *again = TRUE; | |
2008 | break; | |
2009 | } | |
2010 | } | |
2011 | else if ((0x94 == (code_msb & 0xfe)) | |
28c9d252 NC |
2012 | && (0x0e == (code_lsb & 0x0e)) |
2013 | && avr_replace_call_ret_sequences) | |
df406460 NC |
2014 | { |
2015 | /* This insn is a call. */ | |
2016 | unsigned char next_insn_msb = 0; | |
2017 | unsigned char next_insn_lsb = 0; | |
2018 | ||
2019 | if (irel->r_offset + 5 < sec->size) | |
2020 | { | |
2021 | next_insn_msb = | |
91d6fa6a | 2022 | bfd_get_8 (abfd, contents + irel->r_offset + 5); |
df406460 | 2023 | next_insn_lsb = |
91d6fa6a | 2024 | bfd_get_8 (abfd, contents + irel->r_offset + 4); |
df406460 | 2025 | } |
4cdc7696 | 2026 | |
df406460 NC |
2027 | if ((0x95 == next_insn_msb) && (0x08 == next_insn_lsb)) |
2028 | { | |
2029 | /* The next insn is a ret. We now convert the call insn | |
2030 | into a jmp instruction. */ | |
2031 | ||
2032 | code_lsb &= 0xfd; | |
2033 | bfd_put_8 (abfd, code_lsb, contents + irel->r_offset); | |
28c9d252 | 2034 | if (debug_relax) |
df406460 NC |
2035 | printf ("converted call/ret sequence at address 0x%x" |
2036 | " into jmp/ret sequence. Section is %s\n\n", | |
2037 | (int) dot, sec->name); | |
2038 | *again = TRUE; | |
2039 | break; | |
2040 | } | |
2041 | } | |
4cdc7696 NC |
2042 | else if ((0xc0 == (code_msb & 0xf0)) |
2043 | || ((0x94 == (code_msb & 0xfe)) | |
df406460 NC |
2044 | && (0x0c == (code_lsb & 0x0e)))) |
2045 | { | |
4cdc7696 | 2046 | /* This insn is a rjmp or a jmp. */ |
df406460 NC |
2047 | unsigned char next_insn_msb = 0; |
2048 | unsigned char next_insn_lsb = 0; | |
2049 | int insn_size; | |
2050 | ||
2051 | if (0xc0 == (code_msb & 0xf0)) | |
2052 | insn_size = 2; /* rjmp insn */ | |
2053 | else | |
2054 | insn_size = 4; /* jmp insn */ | |
2055 | ||
2056 | if (irel->r_offset + insn_size + 1 < sec->size) | |
2057 | { | |
4cdc7696 | 2058 | next_insn_msb = |
91d6fa6a NC |
2059 | bfd_get_8 (abfd, contents + irel->r_offset |
2060 | + insn_size + 1); | |
4cdc7696 | 2061 | next_insn_lsb = |
91d6fa6a NC |
2062 | bfd_get_8 (abfd, contents + irel->r_offset |
2063 | + insn_size); | |
df406460 NC |
2064 | } |
2065 | ||
2066 | if ((0x95 == next_insn_msb) && (0x08 == next_insn_lsb)) | |
2067 | { | |
2068 | /* The next insn is a ret. We possibly could delete | |
cc643b88 | 2069 | this ret. First we need to check for preceding |
df406460 NC |
2070 | sbis/sbic/sbrs or cpse "skip" instructions. */ |
2071 | ||
cc643b88 | 2072 | int there_is_preceding_non_skip_insn = 1; |
df406460 NC |
2073 | bfd_vma address_of_ret; |
2074 | ||
2075 | address_of_ret = dot + insn_size; | |
2076 | ||
28c9d252 | 2077 | if (debug_relax && (insn_size == 2)) |
4cdc7696 | 2078 | printf ("found rjmp / ret sequence at address 0x%x\n", |
df406460 | 2079 | (int) dot); |
28c9d252 | 2080 | if (debug_relax && (insn_size == 4)) |
4cdc7696 | 2081 | printf ("found jmp / ret sequence at address 0x%x\n", |
df406460 NC |
2082 | (int) dot); |
2083 | ||
cc643b88 | 2084 | /* We have to make sure that there is a preceding insn. */ |
df406460 NC |
2085 | if (irel->r_offset >= 2) |
2086 | { | |
cc643b88 NC |
2087 | unsigned char preceding_msb; |
2088 | unsigned char preceding_lsb; | |
2089 | ||
2090 | preceding_msb = | |
91d6fa6a | 2091 | bfd_get_8 (abfd, contents + irel->r_offset - 1); |
cc643b88 | 2092 | preceding_lsb = |
91d6fa6a | 2093 | bfd_get_8 (abfd, contents + irel->r_offset - 2); |
df406460 NC |
2094 | |
2095 | /* sbic. */ | |
cc643b88 NC |
2096 | if (0x99 == preceding_msb) |
2097 | there_is_preceding_non_skip_insn = 0; | |
df406460 NC |
2098 | |
2099 | /* sbis. */ | |
cc643b88 NC |
2100 | if (0x9b == preceding_msb) |
2101 | there_is_preceding_non_skip_insn = 0; | |
df406460 NC |
2102 | |
2103 | /* sbrc */ | |
cc643b88 NC |
2104 | if ((0xfc == (preceding_msb & 0xfe) |
2105 | && (0x00 == (preceding_lsb & 0x08)))) | |
2106 | there_is_preceding_non_skip_insn = 0; | |
df406460 | 2107 | |
4cdc7696 | 2108 | /* sbrs */ |
cc643b88 NC |
2109 | if ((0xfe == (preceding_msb & 0xfe) |
2110 | && (0x00 == (preceding_lsb & 0x08)))) | |
2111 | there_is_preceding_non_skip_insn = 0; | |
4cdc7696 | 2112 | |
df406460 | 2113 | /* cpse */ |
cc643b88 NC |
2114 | if (0x10 == (preceding_msb & 0xfc)) |
2115 | there_is_preceding_non_skip_insn = 0; | |
4cdc7696 | 2116 | |
cc643b88 | 2117 | if (there_is_preceding_non_skip_insn == 0) |
28c9d252 | 2118 | if (debug_relax) |
cc643b88 NC |
2119 | printf ("preceding skip insn prevents deletion of" |
2120 | " ret insn at Addy 0x%x in section %s\n", | |
df406460 NC |
2121 | (int) dot + 2, sec->name); |
2122 | } | |
2123 | else | |
2124 | { | |
2125 | /* There is no previous instruction. */ | |
cc643b88 | 2126 | there_is_preceding_non_skip_insn = 0; |
4cdc7696 | 2127 | } |
df406460 | 2128 | |
cc643b88 | 2129 | if (there_is_preceding_non_skip_insn) |
df406460 NC |
2130 | { |
2131 | /* We now only have to make sure that there is no | |
2132 | local label defined at the address of the ret | |
2133 | instruction and that there is no local relocation | |
2134 | in this section pointing to the ret. */ | |
2135 | ||
2136 | int deleting_ret_is_safe = 1; | |
4cdc7696 | 2137 | unsigned int section_offset_of_ret_insn = |
91d6fa6a | 2138 | irel->r_offset + insn_size; |
df406460 NC |
2139 | Elf_Internal_Sym *isym, *isymend; |
2140 | unsigned int sec_shndx; | |
4cdc7696 NC |
2141 | |
2142 | sec_shndx = | |
2143 | _bfd_elf_section_from_bfd_section (abfd, sec); | |
df406460 NC |
2144 | |
2145 | /* Check for local symbols. */ | |
2146 | isym = (Elf_Internal_Sym *) symtab_hdr->contents; | |
2147 | isymend = isym + symtab_hdr->sh_info; | |
696b7ad2 NC |
2148 | /* PR 6019: There may not be any local symbols. */ |
2149 | for (; isym != NULL && isym < isymend; isym++) | |
91d6fa6a NC |
2150 | { |
2151 | if (isym->st_value == section_offset_of_ret_insn | |
2152 | && isym->st_shndx == sec_shndx) | |
2153 | { | |
2154 | deleting_ret_is_safe = 0; | |
2155 | if (debug_relax) | |
2156 | printf ("local label prevents deletion of ret " | |
2157 | "insn at address 0x%x\n", | |
2158 | (int) dot + insn_size); | |
2159 | } | |
2160 | } | |
2161 | ||
2162 | /* Now check for global symbols. */ | |
2163 | { | |
2164 | int symcount; | |
2165 | struct elf_link_hash_entry **sym_hashes; | |
2166 | struct elf_link_hash_entry **end_hashes; | |
2167 | ||
2168 | symcount = (symtab_hdr->sh_size | |
2169 | / sizeof (Elf32_External_Sym) | |
2170 | - symtab_hdr->sh_info); | |
2171 | sym_hashes = elf_sym_hashes (abfd); | |
2172 | end_hashes = sym_hashes + symcount; | |
2173 | for (; sym_hashes < end_hashes; sym_hashes++) | |
2174 | { | |
2175 | struct elf_link_hash_entry *sym_hash = | |
2176 | *sym_hashes; | |
2177 | if ((sym_hash->root.type == bfd_link_hash_defined | |
2178 | || sym_hash->root.type == | |
4cdc7696 | 2179 | bfd_link_hash_defweak) |
91d6fa6a NC |
2180 | && sym_hash->root.u.def.section == sec |
2181 | && sym_hash->root.u.def.value == section_offset_of_ret_insn) | |
2182 | { | |
2183 | deleting_ret_is_safe = 0; | |
2184 | if (debug_relax) | |
2185 | printf ("global label prevents deletion of " | |
2186 | "ret insn at address 0x%x\n", | |
2187 | (int) dot + insn_size); | |
2188 | } | |
2189 | } | |
2190 | } | |
2191 | /* Now we check for relocations pointing to ret. */ | |
2192 | { | |
2193 | Elf_Internal_Rela *rel; | |
2194 | Elf_Internal_Rela *relend; | |
2195 | ||
2196 | relend = elf_section_data (sec)->relocs | |
2197 | + sec->reloc_count; | |
2198 | ||
2199 | for (rel = elf_section_data (sec)->relocs; | |
2200 | rel < relend; rel++) | |
2201 | { | |
2202 | bfd_vma reloc_target = 0; | |
2203 | ||
2204 | /* Read this BFD's local symbols if we haven't | |
2205 | done so already. */ | |
2206 | if (isymbuf == NULL && symtab_hdr->sh_info != 0) | |
2207 | { | |
2208 | isymbuf = (Elf_Internal_Sym *) | |
2209 | symtab_hdr->contents; | |
2210 | if (isymbuf == NULL) | |
2211 | isymbuf = bfd_elf_get_elf_syms | |
2212 | (abfd, | |
2213 | symtab_hdr, | |
2214 | symtab_hdr->sh_info, 0, | |
2215 | NULL, NULL, NULL); | |
2216 | if (isymbuf == NULL) | |
2217 | break; | |
2218 | } | |
2219 | ||
2220 | /* Get the value of the symbol referred to | |
2221 | by the reloc. */ | |
2222 | if (ELF32_R_SYM (rel->r_info) | |
2223 | < symtab_hdr->sh_info) | |
2224 | { | |
2225 | /* A local symbol. */ | |
2226 | asection *sym_sec; | |
2227 | ||
2228 | isym = isymbuf | |
2229 | + ELF32_R_SYM (rel->r_info); | |
2230 | sym_sec = bfd_section_from_elf_index | |
2231 | (abfd, isym->st_shndx); | |
2232 | symval = isym->st_value; | |
2233 | ||
2234 | /* If the reloc is absolute, it will not | |
2235 | have a symbol or section associated | |
2236 | with it. */ | |
2237 | ||
2238 | if (sym_sec) | |
2239 | { | |
2240 | symval += | |
2241 | sym_sec->output_section->vma | |
2242 | + sym_sec->output_offset; | |
2243 | reloc_target = symval + rel->r_addend; | |
2244 | } | |
2245 | else | |
2246 | { | |
2247 | reloc_target = symval + rel->r_addend; | |
2248 | /* Reference symbol is absolute. */ | |
2249 | } | |
2250 | } | |
2251 | /* else ... reference symbol is extern. */ | |
2252 | ||
2253 | if (address_of_ret == reloc_target) | |
2254 | { | |
2255 | deleting_ret_is_safe = 0; | |
2256 | if (debug_relax) | |
2257 | printf ("ret from " | |
2258 | "rjmp/jmp ret sequence at address" | |
2259 | " 0x%x could not be deleted. ret" | |
2260 | " is target of a relocation.\n", | |
2261 | (int) address_of_ret); | |
2262 | } | |
2263 | } | |
2264 | } | |
2265 | ||
2266 | if (deleting_ret_is_safe) | |
2267 | { | |
2268 | if (debug_relax) | |
2269 | printf ("unreachable ret instruction " | |
2270 | "at address 0x%x deleted.\n", | |
2271 | (int) dot + insn_size); | |
2272 | ||
2273 | /* Delete two bytes of data. */ | |
2274 | if (!elf32_avr_relax_delete_bytes (abfd, sec, | |
2275 | irel->r_offset + insn_size, 2)) | |
2276 | goto error_return; | |
2277 | ||
2278 | /* That will change things, so, we should relax | |
2279 | again. Note that this is not required, and it | |
2280 | may be slow. */ | |
2281 | *again = TRUE; | |
2282 | break; | |
2283 | } | |
df406460 | 2284 | } |
4cdc7696 NC |
2285 | |
2286 | } | |
2287 | } | |
df406460 NC |
2288 | break; |
2289 | } | |
2290 | } | |
2291 | } | |
2292 | ||
2293 | if (contents != NULL | |
2294 | && elf_section_data (sec)->this_hdr.contents != contents) | |
2295 | { | |
2296 | if (! link_info->keep_memory) | |
2297 | free (contents); | |
2298 | else | |
2299 | { | |
2300 | /* Cache the section contents for elf_link_input_bfd. */ | |
2301 | elf_section_data (sec)->this_hdr.contents = contents; | |
2302 | } | |
2303 | } | |
2304 | ||
2305 | if (internal_relocs != NULL | |
2306 | && elf_section_data (sec)->relocs != internal_relocs) | |
2307 | free (internal_relocs); | |
2308 | ||
2309 | return TRUE; | |
2310 | ||
2311 | error_return: | |
2312 | if (isymbuf != NULL | |
2313 | && symtab_hdr->contents != (unsigned char *) isymbuf) | |
2314 | free (isymbuf); | |
2315 | if (contents != NULL | |
2316 | && elf_section_data (sec)->this_hdr.contents != contents) | |
2317 | free (contents); | |
2318 | if (internal_relocs != NULL | |
2319 | && elf_section_data (sec)->relocs != internal_relocs) | |
2320 | free (internal_relocs); | |
2321 | ||
4cdc7696 | 2322 | return FALSE; |
df406460 NC |
2323 | } |
2324 | ||
2325 | /* This is a version of bfd_generic_get_relocated_section_contents | |
4cdc7696 | 2326 | which uses elf32_avr_relocate_section. |
df406460 | 2327 | |
4cdc7696 | 2328 | For avr it's essentially a cut and paste taken from the H8300 port. |
df406460 | 2329 | The author of the relaxation support patch for avr had absolutely no |
4cdc7696 | 2330 | clue what is happening here but found out that this part of the code |
df406460 NC |
2331 | seems to be important. */ |
2332 | ||
2333 | static bfd_byte * | |
2334 | elf32_avr_get_relocated_section_contents (bfd *output_bfd, | |
2335 | struct bfd_link_info *link_info, | |
2336 | struct bfd_link_order *link_order, | |
2337 | bfd_byte *data, | |
2338 | bfd_boolean relocatable, | |
2339 | asymbol **symbols) | |
2340 | { | |
2341 | Elf_Internal_Shdr *symtab_hdr; | |
2342 | asection *input_section = link_order->u.indirect.section; | |
2343 | bfd *input_bfd = input_section->owner; | |
2344 | asection **sections = NULL; | |
2345 | Elf_Internal_Rela *internal_relocs = NULL; | |
2346 | Elf_Internal_Sym *isymbuf = NULL; | |
2347 | ||
2348 | /* We only need to handle the case of relaxing, or of having a | |
2349 | particular set of section contents, specially. */ | |
2350 | if (relocatable | |
2351 | || elf_section_data (input_section)->this_hdr.contents == NULL) | |
2352 | return bfd_generic_get_relocated_section_contents (output_bfd, link_info, | |
2353 | link_order, data, | |
2354 | relocatable, | |
2355 | symbols); | |
2356 | symtab_hdr = &elf_tdata (input_bfd)->symtab_hdr; | |
2357 | ||
2358 | memcpy (data, elf_section_data (input_section)->this_hdr.contents, | |
2359 | (size_t) input_section->size); | |
2360 | ||
2361 | if ((input_section->flags & SEC_RELOC) != 0 | |
2362 | && input_section->reloc_count > 0) | |
2363 | { | |
2364 | asection **secpp; | |
2365 | Elf_Internal_Sym *isym, *isymend; | |
2366 | bfd_size_type amt; | |
2367 | ||
2368 | internal_relocs = (_bfd_elf_link_read_relocs | |
4cdc7696 | 2369 | (input_bfd, input_section, NULL, NULL, FALSE)); |
df406460 NC |
2370 | if (internal_relocs == NULL) |
2371 | goto error_return; | |
2372 | ||
2373 | if (symtab_hdr->sh_info != 0) | |
2374 | { | |
2375 | isymbuf = (Elf_Internal_Sym *) symtab_hdr->contents; | |
2376 | if (isymbuf == NULL) | |
2377 | isymbuf = bfd_elf_get_elf_syms (input_bfd, symtab_hdr, | |
2378 | symtab_hdr->sh_info, 0, | |
2379 | NULL, NULL, NULL); | |
2380 | if (isymbuf == NULL) | |
2381 | goto error_return; | |
2382 | } | |
2383 | ||
2384 | amt = symtab_hdr->sh_info; | |
2385 | amt *= sizeof (asection *); | |
4cdc7696 | 2386 | sections = bfd_malloc (amt); |
df406460 NC |
2387 | if (sections == NULL && amt != 0) |
2388 | goto error_return; | |
2389 | ||
2390 | isymend = isymbuf + symtab_hdr->sh_info; | |
2391 | for (isym = isymbuf, secpp = sections; isym < isymend; ++isym, ++secpp) | |
2392 | { | |
2393 | asection *isec; | |
2394 | ||
2395 | if (isym->st_shndx == SHN_UNDEF) | |
2396 | isec = bfd_und_section_ptr; | |
2397 | else if (isym->st_shndx == SHN_ABS) | |
2398 | isec = bfd_abs_section_ptr; | |
2399 | else if (isym->st_shndx == SHN_COMMON) | |
2400 | isec = bfd_com_section_ptr; | |
2401 | else | |
2402 | isec = bfd_section_from_elf_index (input_bfd, isym->st_shndx); | |
2403 | ||
2404 | *secpp = isec; | |
2405 | } | |
2406 | ||
2407 | if (! elf32_avr_relocate_section (output_bfd, link_info, input_bfd, | |
2408 | input_section, data, internal_relocs, | |
2409 | isymbuf, sections)) | |
2410 | goto error_return; | |
2411 | ||
2412 | if (sections != NULL) | |
2413 | free (sections); | |
2414 | if (isymbuf != NULL | |
2415 | && symtab_hdr->contents != (unsigned char *) isymbuf) | |
2416 | free (isymbuf); | |
2417 | if (elf_section_data (input_section)->relocs != internal_relocs) | |
2418 | free (internal_relocs); | |
2419 | } | |
2420 | ||
2421 | return data; | |
2422 | ||
2423 | error_return: | |
2424 | if (sections != NULL) | |
2425 | free (sections); | |
2426 | if (isymbuf != NULL | |
2427 | && symtab_hdr->contents != (unsigned char *) isymbuf) | |
2428 | free (isymbuf); | |
2429 | if (internal_relocs != NULL | |
2430 | && elf_section_data (input_section)->relocs != internal_relocs) | |
2431 | free (internal_relocs); | |
2432 | return NULL; | |
2433 | } | |
2434 | ||
2435 | ||
28c9d252 NC |
2436 | /* Determines the hash entry name for a particular reloc. It consists of |
2437 | the identifier of the symbol section and the added reloc addend and | |
2438 | symbol offset relative to the section the symbol is attached to. */ | |
2439 | ||
2440 | static char * | |
2441 | avr_stub_name (const asection *symbol_section, | |
2442 | const bfd_vma symbol_offset, | |
2443 | const Elf_Internal_Rela *rela) | |
2444 | { | |
2445 | char *stub_name; | |
2446 | bfd_size_type len; | |
2447 | ||
2448 | len = 8 + 1 + 8 + 1 + 1; | |
2449 | stub_name = bfd_malloc (len); | |
2450 | ||
2451 | sprintf (stub_name, "%08x+%08x", | |
2452 | symbol_section->id & 0xffffffff, | |
2453 | (unsigned int) ((rela->r_addend & 0xffffffff) + symbol_offset)); | |
2454 | ||
2455 | return stub_name; | |
2456 | } | |
2457 | ||
2458 | ||
2459 | /* Add a new stub entry to the stub hash. Not all fields of the new | |
2460 | stub entry are initialised. */ | |
2461 | ||
2462 | static struct elf32_avr_stub_hash_entry * | |
2463 | avr_add_stub (const char *stub_name, | |
2464 | struct elf32_avr_link_hash_table *htab) | |
2465 | { | |
2466 | struct elf32_avr_stub_hash_entry *hsh; | |
2467 | ||
2468 | /* Enter this entry into the linker stub hash table. */ | |
2469 | hsh = avr_stub_hash_lookup (&htab->bstab, stub_name, TRUE, FALSE); | |
2470 | ||
2471 | if (hsh == NULL) | |
2472 | { | |
2473 | (*_bfd_error_handler) (_("%B: cannot create stub entry %s"), | |
2474 | NULL, stub_name); | |
2475 | return NULL; | |
2476 | } | |
2477 | ||
2478 | hsh->stub_offset = 0; | |
2479 | return hsh; | |
2480 | } | |
2481 | ||
2482 | /* We assume that there is already space allocated for the stub section | |
2483 | contents and that before building the stubs the section size is | |
2484 | initialized to 0. We assume that within the stub hash table entry, | |
2485 | the absolute position of the jmp target has been written in the | |
2486 | target_value field. We write here the offset of the generated jmp insn | |
2487 | relative to the trampoline section start to the stub_offset entry in | |
2488 | the stub hash table entry. */ | |
2489 | ||
2490 | static bfd_boolean | |
2491 | avr_build_one_stub (struct bfd_hash_entry *bh, void *in_arg) | |
2492 | { | |
2493 | struct elf32_avr_stub_hash_entry *hsh; | |
2494 | struct bfd_link_info *info; | |
2495 | struct elf32_avr_link_hash_table *htab; | |
2496 | bfd *stub_bfd; | |
2497 | bfd_byte *loc; | |
2498 | bfd_vma target; | |
2499 | bfd_vma starget; | |
2500 | ||
2501 | /* Basic opcode */ | |
2502 | bfd_vma jmp_insn = 0x0000940c; | |
2503 | ||
2504 | /* Massage our args to the form they really have. */ | |
2505 | hsh = avr_stub_hash_entry (bh); | |
2506 | ||
2507 | if (!hsh->is_actually_needed) | |
2508 | return TRUE; | |
2509 | ||
2510 | info = (struct bfd_link_info *) in_arg; | |
2511 | ||
2512 | htab = avr_link_hash_table (info); | |
64ee10b6 NC |
2513 | if (htab == NULL) |
2514 | return FALSE; | |
28c9d252 NC |
2515 | |
2516 | target = hsh->target_value; | |
2517 | ||
2518 | /* Make a note of the offset within the stubs for this entry. */ | |
2519 | hsh->stub_offset = htab->stub_sec->size; | |
2520 | loc = htab->stub_sec->contents + hsh->stub_offset; | |
2521 | ||
2522 | stub_bfd = htab->stub_sec->owner; | |
2523 | ||
2524 | if (debug_stubs) | |
2525 | printf ("Building one Stub. Address: 0x%x, Offset: 0x%x\n", | |
2526 | (unsigned int) target, | |
2527 | (unsigned int) hsh->stub_offset); | |
2528 | ||
2529 | /* We now have to add the information on the jump target to the bare | |
2530 | opcode bits already set in jmp_insn. */ | |
2531 | ||
2532 | /* Check for the alignment of the address. */ | |
2533 | if (target & 1) | |
2534 | return FALSE; | |
2535 | ||
2536 | starget = target >> 1; | |
2537 | jmp_insn |= ((starget & 0x10000) | ((starget << 3) & 0x1f00000)) >> 16; | |
2538 | bfd_put_16 (stub_bfd, jmp_insn, loc); | |
2539 | bfd_put_16 (stub_bfd, (bfd_vma) starget & 0xffff, loc + 2); | |
2540 | ||
2541 | htab->stub_sec->size += 4; | |
2542 | ||
2543 | /* Now add the entries in the address mapping table if there is still | |
2544 | space left. */ | |
2545 | { | |
2546 | unsigned int nr; | |
2547 | ||
2548 | nr = htab->amt_entry_cnt + 1; | |
2549 | if (nr <= htab->amt_max_entry_cnt) | |
2550 | { | |
2551 | htab->amt_entry_cnt = nr; | |
2552 | ||
2553 | htab->amt_stub_offsets[nr - 1] = hsh->stub_offset; | |
2554 | htab->amt_destination_addr[nr - 1] = target; | |
2555 | } | |
2556 | } | |
2557 | ||
2558 | return TRUE; | |
2559 | } | |
2560 | ||
2561 | static bfd_boolean | |
2562 | avr_mark_stub_not_to_be_necessary (struct bfd_hash_entry *bh, | |
c7e2358a | 2563 | void *in_arg ATTRIBUTE_UNUSED) |
28c9d252 NC |
2564 | { |
2565 | struct elf32_avr_stub_hash_entry *hsh; | |
28c9d252 | 2566 | |
28c9d252 NC |
2567 | hsh = avr_stub_hash_entry (bh); |
2568 | hsh->is_actually_needed = FALSE; | |
2569 | ||
2570 | return TRUE; | |
2571 | } | |
2572 | ||
2573 | static bfd_boolean | |
2574 | avr_size_one_stub (struct bfd_hash_entry *bh, void *in_arg) | |
2575 | { | |
2576 | struct elf32_avr_stub_hash_entry *hsh; | |
2577 | struct elf32_avr_link_hash_table *htab; | |
2578 | int size; | |
2579 | ||
2580 | /* Massage our args to the form they really have. */ | |
2581 | hsh = avr_stub_hash_entry (bh); | |
2582 | htab = in_arg; | |
2583 | ||
2584 | if (hsh->is_actually_needed) | |
2585 | size = 4; | |
2586 | else | |
2587 | size = 0; | |
2588 | ||
2589 | htab->stub_sec->size += size; | |
2590 | return TRUE; | |
2591 | } | |
2592 | ||
2593 | void | |
2594 | elf32_avr_setup_params (struct bfd_link_info *info, | |
2595 | bfd *avr_stub_bfd, | |
2596 | asection *avr_stub_section, | |
2597 | bfd_boolean no_stubs, | |
2598 | bfd_boolean deb_stubs, | |
2599 | bfd_boolean deb_relax, | |
2600 | bfd_vma pc_wrap_around, | |
2601 | bfd_boolean call_ret_replacement) | |
2602 | { | |
64ee10b6 | 2603 | struct elf32_avr_link_hash_table *htab = avr_link_hash_table (info); |
28c9d252 | 2604 | |
64ee10b6 NC |
2605 | if (htab == NULL) |
2606 | return; | |
28c9d252 NC |
2607 | htab->stub_sec = avr_stub_section; |
2608 | htab->stub_bfd = avr_stub_bfd; | |
2609 | htab->no_stubs = no_stubs; | |
2610 | ||
2611 | debug_relax = deb_relax; | |
2612 | debug_stubs = deb_stubs; | |
2613 | avr_pc_wrap_around = pc_wrap_around; | |
2614 | avr_replace_call_ret_sequences = call_ret_replacement; | |
2615 | } | |
2616 | ||
2617 | ||
2618 | /* Set up various things so that we can make a list of input sections | |
2619 | for each output section included in the link. Returns -1 on error, | |
2620 | 0 when no stubs will be needed, and 1 on success. It also sets | |
2621 | information on the stubs bfd and the stub section in the info | |
2622 | struct. */ | |
2623 | ||
2624 | int | |
2625 | elf32_avr_setup_section_lists (bfd *output_bfd, | |
2626 | struct bfd_link_info *info) | |
2627 | { | |
2628 | bfd *input_bfd; | |
2629 | unsigned int bfd_count; | |
2630 | int top_id, top_index; | |
2631 | asection *section; | |
2632 | asection **input_list, **list; | |
2633 | bfd_size_type amt; | |
4dfe6ac6 | 2634 | struct elf32_avr_link_hash_table *htab = avr_link_hash_table (info); |
28c9d252 | 2635 | |
64ee10b6 | 2636 | if (htab == NULL || htab->no_stubs) |
28c9d252 NC |
2637 | return 0; |
2638 | ||
2639 | /* Count the number of input BFDs and find the top input section id. */ | |
2640 | for (input_bfd = info->input_bfds, bfd_count = 0, top_id = 0; | |
2641 | input_bfd != NULL; | |
2642 | input_bfd = input_bfd->link_next) | |
2643 | { | |
2644 | bfd_count += 1; | |
2645 | for (section = input_bfd->sections; | |
2646 | section != NULL; | |
2647 | section = section->next) | |
2648 | if (top_id < section->id) | |
2649 | top_id = section->id; | |
2650 | } | |
2651 | ||
2652 | htab->bfd_count = bfd_count; | |
2653 | ||
2654 | /* We can't use output_bfd->section_count here to find the top output | |
2655 | section index as some sections may have been removed, and | |
2656 | strip_excluded_output_sections doesn't renumber the indices. */ | |
2657 | for (section = output_bfd->sections, top_index = 0; | |
2658 | section != NULL; | |
2659 | section = section->next) | |
2660 | if (top_index < section->index) | |
2661 | top_index = section->index; | |
2662 | ||
2663 | htab->top_index = top_index; | |
2664 | amt = sizeof (asection *) * (top_index + 1); | |
2665 | input_list = bfd_malloc (amt); | |
2666 | htab->input_list = input_list; | |
2667 | if (input_list == NULL) | |
2668 | return -1; | |
2669 | ||
2670 | /* For sections we aren't interested in, mark their entries with a | |
2671 | value we can check later. */ | |
2672 | list = input_list + top_index; | |
2673 | do | |
2674 | *list = bfd_abs_section_ptr; | |
2675 | while (list-- != input_list); | |
2676 | ||
2677 | for (section = output_bfd->sections; | |
2678 | section != NULL; | |
2679 | section = section->next) | |
2680 | if ((section->flags & SEC_CODE) != 0) | |
2681 | input_list[section->index] = NULL; | |
2682 | ||
2683 | return 1; | |
2684 | } | |
2685 | ||
2686 | ||
2687 | /* Read in all local syms for all input bfds, and create hash entries | |
2688 | for export stubs if we are building a multi-subspace shared lib. | |
2689 | Returns -1 on error, 0 otherwise. */ | |
2690 | ||
2691 | static int | |
2692 | get_local_syms (bfd *input_bfd, struct bfd_link_info *info) | |
2693 | { | |
2694 | unsigned int bfd_indx; | |
2695 | Elf_Internal_Sym *local_syms, **all_local_syms; | |
2696 | struct elf32_avr_link_hash_table *htab = avr_link_hash_table (info); | |
9a008db3 | 2697 | bfd_size_type amt; |
28c9d252 | 2698 | |
64ee10b6 NC |
2699 | if (htab == NULL) |
2700 | return -1; | |
2701 | ||
28c9d252 NC |
2702 | /* We want to read in symbol extension records only once. To do this |
2703 | we need to read in the local symbols in parallel and save them for | |
2704 | later use; so hold pointers to the local symbols in an array. */ | |
9a008db3 | 2705 | amt = sizeof (Elf_Internal_Sym *) * htab->bfd_count; |
28c9d252 NC |
2706 | all_local_syms = bfd_zmalloc (amt); |
2707 | htab->all_local_syms = all_local_syms; | |
2708 | if (all_local_syms == NULL) | |
2709 | return -1; | |
2710 | ||
2711 | /* Walk over all the input BFDs, swapping in local symbols. | |
2712 | If we are creating a shared library, create hash entries for the | |
2713 | export stubs. */ | |
2714 | for (bfd_indx = 0; | |
2715 | input_bfd != NULL; | |
2716 | input_bfd = input_bfd->link_next, bfd_indx++) | |
2717 | { | |
2718 | Elf_Internal_Shdr *symtab_hdr; | |
2719 | ||
2720 | /* We'll need the symbol table in a second. */ | |
2721 | symtab_hdr = &elf_tdata (input_bfd)->symtab_hdr; | |
2722 | if (symtab_hdr->sh_info == 0) | |
2723 | continue; | |
2724 | ||
2725 | /* We need an array of the local symbols attached to the input bfd. */ | |
2726 | local_syms = (Elf_Internal_Sym *) symtab_hdr->contents; | |
2727 | if (local_syms == NULL) | |
2728 | { | |
2729 | local_syms = bfd_elf_get_elf_syms (input_bfd, symtab_hdr, | |
2730 | symtab_hdr->sh_info, 0, | |
2731 | NULL, NULL, NULL); | |
2732 | /* Cache them for elf_link_input_bfd. */ | |
2733 | symtab_hdr->contents = (unsigned char *) local_syms; | |
2734 | } | |
2735 | if (local_syms == NULL) | |
2736 | return -1; | |
2737 | ||
2738 | all_local_syms[bfd_indx] = local_syms; | |
2739 | } | |
2740 | ||
2741 | return 0; | |
2742 | } | |
2743 | ||
2744 | #define ADD_DUMMY_STUBS_FOR_DEBUGGING 0 | |
2745 | ||
2746 | bfd_boolean | |
2747 | elf32_avr_size_stubs (bfd *output_bfd, | |
2748 | struct bfd_link_info *info, | |
2749 | bfd_boolean is_prealloc_run) | |
2750 | { | |
64ee10b6 NC |
2751 | struct elf32_avr_link_hash_table *htab; |
2752 | int stub_changed = 0; | |
28c9d252 | 2753 | |
64ee10b6 NC |
2754 | htab = avr_link_hash_table (info); |
2755 | if (htab == NULL) | |
2756 | return FALSE; | |
28c9d252 | 2757 | |
64ee10b6 NC |
2758 | /* At this point we initialize htab->vector_base |
2759 | To the start of the text output section. */ | |
2760 | htab->vector_base = htab->stub_sec->output_section->vma; | |
28c9d252 | 2761 | |
64ee10b6 NC |
2762 | if (get_local_syms (info->input_bfds, info)) |
2763 | { | |
2764 | if (htab->all_local_syms) | |
2765 | goto error_ret_free_local; | |
2766 | return FALSE; | |
2767 | } | |
28c9d252 NC |
2768 | |
2769 | if (ADD_DUMMY_STUBS_FOR_DEBUGGING) | |
2770 | { | |
2771 | struct elf32_avr_stub_hash_entry *test; | |
2772 | ||
2773 | test = avr_add_stub ("Hugo",htab); | |
2774 | test->target_value = 0x123456; | |
2775 | test->stub_offset = 13; | |
2776 | ||
2777 | test = avr_add_stub ("Hugo2",htab); | |
2778 | test->target_value = 0x84210; | |
2779 | test->stub_offset = 14; | |
2780 | } | |
2781 | ||
2782 | while (1) | |
2783 | { | |
2784 | bfd *input_bfd; | |
2785 | unsigned int bfd_indx; | |
2786 | ||
2787 | /* We will have to re-generate the stub hash table each time anything | |
2788 | in memory has changed. */ | |
2789 | ||
2790 | bfd_hash_traverse (&htab->bstab, avr_mark_stub_not_to_be_necessary, htab); | |
2791 | for (input_bfd = info->input_bfds, bfd_indx = 0; | |
2792 | input_bfd != NULL; | |
2793 | input_bfd = input_bfd->link_next, bfd_indx++) | |
2794 | { | |
2795 | Elf_Internal_Shdr *symtab_hdr; | |
2796 | asection *section; | |
2797 | Elf_Internal_Sym *local_syms; | |
2798 | ||
2799 | /* We'll need the symbol table in a second. */ | |
2800 | symtab_hdr = &elf_tdata (input_bfd)->symtab_hdr; | |
2801 | if (symtab_hdr->sh_info == 0) | |
2802 | continue; | |
2803 | ||
2804 | local_syms = htab->all_local_syms[bfd_indx]; | |
2805 | ||
2806 | /* Walk over each section attached to the input bfd. */ | |
2807 | for (section = input_bfd->sections; | |
2808 | section != NULL; | |
2809 | section = section->next) | |
2810 | { | |
2811 | Elf_Internal_Rela *internal_relocs, *irelaend, *irela; | |
2812 | ||
2813 | /* If there aren't any relocs, then there's nothing more | |
2814 | to do. */ | |
2815 | if ((section->flags & SEC_RELOC) == 0 | |
2816 | || section->reloc_count == 0) | |
2817 | continue; | |
2818 | ||
2819 | /* If this section is a link-once section that will be | |
2820 | discarded, then don't create any stubs. */ | |
2821 | if (section->output_section == NULL | |
2822 | || section->output_section->owner != output_bfd) | |
2823 | continue; | |
2824 | ||
2825 | /* Get the relocs. */ | |
2826 | internal_relocs | |
2827 | = _bfd_elf_link_read_relocs (input_bfd, section, NULL, NULL, | |
2828 | info->keep_memory); | |
2829 | if (internal_relocs == NULL) | |
2830 | goto error_ret_free_local; | |
2831 | ||
2832 | /* Now examine each relocation. */ | |
2833 | irela = internal_relocs; | |
2834 | irelaend = irela + section->reloc_count; | |
2835 | for (; irela < irelaend; irela++) | |
2836 | { | |
2837 | unsigned int r_type, r_indx; | |
2838 | struct elf32_avr_stub_hash_entry *hsh; | |
2839 | asection *sym_sec; | |
2840 | bfd_vma sym_value; | |
2841 | bfd_vma destination; | |
2842 | struct elf_link_hash_entry *hh; | |
2843 | char *stub_name; | |
2844 | ||
2845 | r_type = ELF32_R_TYPE (irela->r_info); | |
2846 | r_indx = ELF32_R_SYM (irela->r_info); | |
2847 | ||
2848 | /* Only look for 16 bit GS relocs. No other reloc will need a | |
2849 | stub. */ | |
2850 | if (!((r_type == R_AVR_16_PM) | |
2851 | || (r_type == R_AVR_LO8_LDI_GS) | |
2852 | || (r_type == R_AVR_HI8_LDI_GS))) | |
2853 | continue; | |
2854 | ||
2855 | /* Now determine the call target, its name, value, | |
2856 | section. */ | |
2857 | sym_sec = NULL; | |
2858 | sym_value = 0; | |
2859 | destination = 0; | |
2860 | hh = NULL; | |
2861 | if (r_indx < symtab_hdr->sh_info) | |
2862 | { | |
2863 | /* It's a local symbol. */ | |
2864 | Elf_Internal_Sym *sym; | |
2865 | Elf_Internal_Shdr *hdr; | |
4fbb74a6 | 2866 | unsigned int shndx; |
28c9d252 NC |
2867 | |
2868 | sym = local_syms + r_indx; | |
28c9d252 NC |
2869 | if (ELF_ST_TYPE (sym->st_info) != STT_SECTION) |
2870 | sym_value = sym->st_value; | |
4fbb74a6 AM |
2871 | shndx = sym->st_shndx; |
2872 | if (shndx < elf_numsections (input_bfd)) | |
2873 | { | |
2874 | hdr = elf_elfsections (input_bfd)[shndx]; | |
2875 | sym_sec = hdr->bfd_section; | |
2876 | destination = (sym_value + irela->r_addend | |
2877 | + sym_sec->output_offset | |
2878 | + sym_sec->output_section->vma); | |
2879 | } | |
28c9d252 NC |
2880 | } |
2881 | else | |
2882 | { | |
2883 | /* It's an external symbol. */ | |
2884 | int e_indx; | |
2885 | ||
2886 | e_indx = r_indx - symtab_hdr->sh_info; | |
2887 | hh = elf_sym_hashes (input_bfd)[e_indx]; | |
2888 | ||
2889 | while (hh->root.type == bfd_link_hash_indirect | |
2890 | || hh->root.type == bfd_link_hash_warning) | |
2891 | hh = (struct elf_link_hash_entry *) | |
2892 | (hh->root.u.i.link); | |
2893 | ||
2894 | if (hh->root.type == bfd_link_hash_defined | |
2895 | || hh->root.type == bfd_link_hash_defweak) | |
2896 | { | |
2897 | sym_sec = hh->root.u.def.section; | |
2898 | sym_value = hh->root.u.def.value; | |
2899 | if (sym_sec->output_section != NULL) | |
2900 | destination = (sym_value + irela->r_addend | |
2901 | + sym_sec->output_offset | |
2902 | + sym_sec->output_section->vma); | |
2903 | } | |
2904 | else if (hh->root.type == bfd_link_hash_undefweak) | |
2905 | { | |
2906 | if (! info->shared) | |
2907 | continue; | |
2908 | } | |
2909 | else if (hh->root.type == bfd_link_hash_undefined) | |
2910 | { | |
2911 | if (! (info->unresolved_syms_in_objects == RM_IGNORE | |
2912 | && (ELF_ST_VISIBILITY (hh->other) | |
2913 | == STV_DEFAULT))) | |
2914 | continue; | |
2915 | } | |
2916 | else | |
2917 | { | |
2918 | bfd_set_error (bfd_error_bad_value); | |
2919 | ||
2920 | error_ret_free_internal: | |
2921 | if (elf_section_data (section)->relocs == NULL) | |
2922 | free (internal_relocs); | |
2923 | goto error_ret_free_local; | |
2924 | } | |
2925 | } | |
2926 | ||
2927 | if (! avr_stub_is_required_for_16_bit_reloc | |
2928 | (destination - htab->vector_base)) | |
2929 | { | |
2930 | if (!is_prealloc_run) | |
2931 | /* We are having a reloc that does't need a stub. */ | |
2932 | continue; | |
2933 | ||
2934 | /* We don't right now know if a stub will be needed. | |
2935 | Let's rather be on the safe side. */ | |
2936 | } | |
2937 | ||
2938 | /* Get the name of this stub. */ | |
2939 | stub_name = avr_stub_name (sym_sec, sym_value, irela); | |
2940 | ||
2941 | if (!stub_name) | |
2942 | goto error_ret_free_internal; | |
2943 | ||
2944 | ||
2945 | hsh = avr_stub_hash_lookup (&htab->bstab, | |
2946 | stub_name, | |
2947 | FALSE, FALSE); | |
2948 | if (hsh != NULL) | |
2949 | { | |
2950 | /* The proper stub has already been created. Mark it | |
2951 | to be used and write the possibly changed destination | |
2952 | value. */ | |
2953 | hsh->is_actually_needed = TRUE; | |
2954 | hsh->target_value = destination; | |
2955 | free (stub_name); | |
2956 | continue; | |
2957 | } | |
2958 | ||
2959 | hsh = avr_add_stub (stub_name, htab); | |
2960 | if (hsh == NULL) | |
2961 | { | |
2962 | free (stub_name); | |
2963 | goto error_ret_free_internal; | |
2964 | } | |
2965 | ||
2966 | hsh->is_actually_needed = TRUE; | |
2967 | hsh->target_value = destination; | |
2968 | ||
2969 | if (debug_stubs) | |
2970 | printf ("Adding stub with destination 0x%x to the" | |
2971 | " hash table.\n", (unsigned int) destination); | |
2972 | if (debug_stubs) | |
2973 | printf ("(Pre-Alloc run: %i)\n", is_prealloc_run); | |
2974 | ||
2975 | stub_changed = TRUE; | |
2976 | } | |
2977 | ||
2978 | /* We're done with the internal relocs, free them. */ | |
2979 | if (elf_section_data (section)->relocs == NULL) | |
2980 | free (internal_relocs); | |
2981 | } | |
2982 | } | |
2983 | ||
2984 | /* Re-Calculate the number of needed stubs. */ | |
2985 | htab->stub_sec->size = 0; | |
2986 | bfd_hash_traverse (&htab->bstab, avr_size_one_stub, htab); | |
2987 | ||
2988 | if (!stub_changed) | |
2989 | break; | |
2990 | ||
2991 | stub_changed = FALSE; | |
2992 | } | |
2993 | ||
2994 | free (htab->all_local_syms); | |
2995 | return TRUE; | |
2996 | ||
2997 | error_ret_free_local: | |
2998 | free (htab->all_local_syms); | |
2999 | return FALSE; | |
3000 | } | |
3001 | ||
3002 | ||
3003 | /* Build all the stubs associated with the current output file. The | |
3004 | stubs are kept in a hash table attached to the main linker hash | |
3005 | table. We also set up the .plt entries for statically linked PIC | |
3006 | functions here. This function is called via hppaelf_finish in the | |
3007 | linker. */ | |
3008 | ||
3009 | bfd_boolean | |
3010 | elf32_avr_build_stubs (struct bfd_link_info *info) | |
3011 | { | |
3012 | asection *stub_sec; | |
3013 | struct bfd_hash_table *table; | |
3014 | struct elf32_avr_link_hash_table *htab; | |
3015 | bfd_size_type total_size = 0; | |
3016 | ||
3017 | htab = avr_link_hash_table (info); | |
64ee10b6 NC |
3018 | if (htab == NULL) |
3019 | return FALSE; | |
28c9d252 NC |
3020 | |
3021 | /* In case that there were several stub sections: */ | |
3022 | for (stub_sec = htab->stub_bfd->sections; | |
3023 | stub_sec != NULL; | |
3024 | stub_sec = stub_sec->next) | |
3025 | { | |
3026 | bfd_size_type size; | |
3027 | ||
3028 | /* Allocate memory to hold the linker stubs. */ | |
3029 | size = stub_sec->size; | |
3030 | total_size += size; | |
3031 | ||
3032 | stub_sec->contents = bfd_zalloc (htab->stub_bfd, size); | |
3033 | if (stub_sec->contents == NULL && size != 0) | |
3034 | return FALSE; | |
3035 | stub_sec->size = 0; | |
3036 | } | |
3037 | ||
3038 | /* Allocate memory for the adress mapping table. */ | |
3039 | htab->amt_entry_cnt = 0; | |
3040 | htab->amt_max_entry_cnt = total_size / 4; | |
3041 | htab->amt_stub_offsets = bfd_malloc (sizeof (bfd_vma) | |
3042 | * htab->amt_max_entry_cnt); | |
3043 | htab->amt_destination_addr = bfd_malloc (sizeof (bfd_vma) | |
3044 | * htab->amt_max_entry_cnt ); | |
3045 | ||
3046 | if (debug_stubs) | |
3047 | printf ("Allocating %i entries in the AMT\n", htab->amt_max_entry_cnt); | |
3048 | ||
3049 | /* Build the stubs as directed by the stub hash table. */ | |
3050 | table = &htab->bstab; | |
3051 | bfd_hash_traverse (table, avr_build_one_stub, info); | |
3052 | ||
3053 | if (debug_stubs) | |
3054 | printf ("Final Stub section Size: %i\n", (int) htab->stub_sec->size); | |
3055 | ||
3056 | return TRUE; | |
3057 | } | |
3058 | ||
adde6300 | 3059 | #define ELF_ARCH bfd_arch_avr |
ae95ffa6 | 3060 | #define ELF_TARGET_ID AVR_ELF_DATA |
adde6300 | 3061 | #define ELF_MACHINE_CODE EM_AVR |
aa4f99bb | 3062 | #define ELF_MACHINE_ALT1 EM_AVR_OLD |
adde6300 AM |
3063 | #define ELF_MAXPAGESIZE 1 |
3064 | ||
3065 | #define TARGET_LITTLE_SYM bfd_elf32_avr_vec | |
3066 | #define TARGET_LITTLE_NAME "elf32-avr" | |
3067 | ||
28c9d252 NC |
3068 | #define bfd_elf32_bfd_link_hash_table_create elf32_avr_link_hash_table_create |
3069 | #define bfd_elf32_bfd_link_hash_table_free elf32_avr_link_hash_table_free | |
3070 | ||
adde6300 AM |
3071 | #define elf_info_to_howto avr_info_to_howto_rela |
3072 | #define elf_info_to_howto_rel NULL | |
3073 | #define elf_backend_relocate_section elf32_avr_relocate_section | |
adde6300 | 3074 | #define elf_backend_can_gc_sections 1 |
f0fe0e16 | 3075 | #define elf_backend_rela_normal 1 |
adde6300 AM |
3076 | #define elf_backend_final_write_processing \ |
3077 | bfd_elf_avr_final_write_processing | |
3078 | #define elf_backend_object_p elf32_avr_object_p | |
3079 | ||
df406460 NC |
3080 | #define bfd_elf32_bfd_relax_section elf32_avr_relax_section |
3081 | #define bfd_elf32_bfd_get_relocated_section_contents \ | |
3082 | elf32_avr_get_relocated_section_contents | |
3083 | ||
adde6300 | 3084 | #include "elf32-target.h" |