Commit | Line | Data |
---|---|---|
adde6300 | 1 | /* AVR-specific support for 32-bit ELF |
df406460 | 2 | Copyright 1999, 2000, 2001, 2002, 2003, 2004, 2006 |
b2a8e766 | 3 | Free Software Foundation, Inc. |
adde6300 AM |
4 | Contributed by Denis Chertykov <denisc@overta.ru> |
5 | ||
750bce0e | 6 | This file is part of BFD, the Binary File Descriptor library. |
adde6300 | 7 | |
750bce0e NC |
8 | This program is free software; you can redistribute it and/or modify |
9 | it under the terms of the GNU General Public License as published by | |
10 | the Free Software Foundation; either version 2 of the License, or | |
11 | (at your option) any later version. | |
adde6300 | 12 | |
750bce0e NC |
13 | This program is distributed in the hope that it will be useful, |
14 | but WITHOUT ANY WARRANTY; without even the implied warranty of | |
15 | MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the | |
16 | GNU General Public License for more details. | |
adde6300 | 17 | |
750bce0e NC |
18 | You should have received a copy of the GNU General Public License |
19 | along with this program; if not, write to the Free Software | |
4cdc7696 | 20 | Foundation, Inc., 51 Franklin Street - Fifth Floor, |
df406460 | 21 | Boston, MA 02110-1301, USA. */ |
adde6300 | 22 | |
adde6300 AM |
23 | #include "bfd.h" |
24 | #include "sysdep.h" | |
25 | #include "libbfd.h" | |
26 | #include "elf-bfd.h" | |
27 | #include "elf/avr.h" | |
28c9d252 NC |
28 | #include "elf32-avr.h" |
29 | ||
30 | /* Enable debugging printout at stdout with this variable. */ | |
31 | static bfd_boolean debug_relax = FALSE; | |
32 | ||
33 | /* Enable debugging printout at stdout with this variable. */ | |
34 | static bfd_boolean debug_stubs = FALSE; | |
35 | ||
36 | /* Hash table initialization and handling. Code is taken from the hppa port | |
37 | and adapted to the needs of AVR. */ | |
38 | ||
39 | /* We use two hash tables to hold information for linking avr objects. | |
40 | ||
41 | The first is the elf32_avr_link_hash_tablse which is derived from the | |
42 | stanard ELF linker hash table. We use this as a place to attach the other | |
43 | hash table and some static information. | |
44 | ||
45 | The second is the stub hash table which is derived from the base BFD | |
46 | hash table. The stub hash table holds the information on the linker | |
47 | stubs. */ | |
48 | ||
49 | struct elf32_avr_stub_hash_entry | |
50 | { | |
51 | /* Base hash table entry structure. */ | |
52 | struct bfd_hash_entry bh_root; | |
53 | ||
54 | /* Offset within stub_sec of the beginning of this stub. */ | |
55 | bfd_vma stub_offset; | |
56 | ||
57 | /* Given the symbol's value and its section we can determine its final | |
58 | value when building the stubs (so the stub knows where to jump). */ | |
59 | bfd_vma target_value; | |
60 | ||
61 | /* This way we could mark stubs to be no longer necessary. */ | |
62 | bfd_boolean is_actually_needed; | |
63 | }; | |
64 | ||
65 | struct elf32_avr_link_hash_table | |
66 | { | |
67 | /* The main hash table. */ | |
68 | struct elf_link_hash_table etab; | |
69 | ||
70 | /* The stub hash table. */ | |
71 | struct bfd_hash_table bstab; | |
72 | ||
73 | bfd_boolean no_stubs; | |
74 | ||
75 | /* Linker stub bfd. */ | |
76 | bfd *stub_bfd; | |
77 | ||
78 | /* The stub section. */ | |
79 | asection *stub_sec; | |
80 | ||
81 | /* Usually 0, unless we are generating code for a bootloader. Will | |
82 | be initialized by elf32_avr_size_stubs to the vma offset of the | |
83 | output section associated with the stub section. */ | |
84 | bfd_vma vector_base; | |
85 | ||
86 | /* Assorted information used by elf32_avr_size_stubs. */ | |
87 | unsigned int bfd_count; | |
88 | int top_index; | |
89 | asection ** input_list; | |
90 | Elf_Internal_Sym ** all_local_syms; | |
91 | ||
92 | /* Tables for mapping vma beyond the 128k boundary to the address of the | |
93 | corresponding stub. (AMT) | |
94 | "amt_max_entry_cnt" reflects the number of entries that memory is allocated | |
95 | for in the "amt_stub_offsets" and "amt_destination_addr" arrays. | |
96 | "amt_entry_cnt" informs how many of these entries actually contain | |
97 | useful data. */ | |
98 | unsigned int amt_entry_cnt; | |
99 | unsigned int amt_max_entry_cnt; | |
100 | bfd_vma * amt_stub_offsets; | |
101 | bfd_vma * amt_destination_addr; | |
102 | }; | |
103 | ||
104 | /* Various hash macros and functions. */ | |
105 | #define avr_link_hash_table(p) \ | |
106 | ((struct elf32_avr_link_hash_table *) ((p)->hash)) | |
107 | ||
108 | #define avr_stub_hash_entry(ent) \ | |
109 | ((struct elf32_avr_stub_hash_entry *)(ent)) | |
110 | ||
111 | #define avr_stub_hash_lookup(table, string, create, copy) \ | |
112 | ((struct elf32_avr_stub_hash_entry *) \ | |
113 | bfd_hash_lookup ((table), (string), (create), (copy))) | |
adde6300 | 114 | |
adde6300 AM |
115 | static reloc_howto_type elf_avr_howto_table[] = |
116 | { | |
117 | HOWTO (R_AVR_NONE, /* type */ | |
118 | 0, /* rightshift */ | |
119 | 2, /* size (0 = byte, 1 = short, 2 = long) */ | |
120 | 32, /* bitsize */ | |
b34976b6 | 121 | FALSE, /* pc_relative */ |
adde6300 AM |
122 | 0, /* bitpos */ |
123 | complain_overflow_bitfield, /* complain_on_overflow */ | |
124 | bfd_elf_generic_reloc, /* special_function */ | |
125 | "R_AVR_NONE", /* name */ | |
b34976b6 | 126 | FALSE, /* partial_inplace */ |
adde6300 AM |
127 | 0, /* src_mask */ |
128 | 0, /* dst_mask */ | |
b34976b6 | 129 | FALSE), /* pcrel_offset */ |
adde6300 AM |
130 | |
131 | HOWTO (R_AVR_32, /* type */ | |
132 | 0, /* rightshift */ | |
133 | 2, /* size (0 = byte, 1 = short, 2 = long) */ | |
134 | 32, /* bitsize */ | |
b34976b6 | 135 | FALSE, /* pc_relative */ |
adde6300 AM |
136 | 0, /* bitpos */ |
137 | complain_overflow_bitfield, /* complain_on_overflow */ | |
138 | bfd_elf_generic_reloc, /* special_function */ | |
139 | "R_AVR_32", /* name */ | |
b34976b6 | 140 | FALSE, /* partial_inplace */ |
adde6300 AM |
141 | 0xffffffff, /* src_mask */ |
142 | 0xffffffff, /* dst_mask */ | |
b34976b6 | 143 | FALSE), /* pcrel_offset */ |
adde6300 AM |
144 | |
145 | /* A 7 bit PC relative relocation. */ | |
146 | HOWTO (R_AVR_7_PCREL, /* type */ | |
147 | 1, /* rightshift */ | |
148 | 1, /* size (0 = byte, 1 = short, 2 = long) */ | |
149 | 7, /* bitsize */ | |
b34976b6 | 150 | TRUE, /* pc_relative */ |
adde6300 AM |
151 | 3, /* bitpos */ |
152 | complain_overflow_bitfield, /* complain_on_overflow */ | |
153 | bfd_elf_generic_reloc, /* special_function */ | |
154 | "R_AVR_7_PCREL", /* name */ | |
b34976b6 | 155 | FALSE, /* partial_inplace */ |
adde6300 AM |
156 | 0xffff, /* src_mask */ |
157 | 0xffff, /* dst_mask */ | |
b34976b6 | 158 | TRUE), /* pcrel_offset */ |
adde6300 AM |
159 | |
160 | /* A 13 bit PC relative relocation. */ | |
161 | HOWTO (R_AVR_13_PCREL, /* type */ | |
162 | 1, /* rightshift */ | |
163 | 1, /* size (0 = byte, 1 = short, 2 = long) */ | |
164 | 13, /* bitsize */ | |
b34976b6 | 165 | TRUE, /* pc_relative */ |
adde6300 AM |
166 | 0, /* bitpos */ |
167 | complain_overflow_bitfield, /* complain_on_overflow */ | |
168 | bfd_elf_generic_reloc, /* special_function */ | |
169 | "R_AVR_13_PCREL", /* name */ | |
b34976b6 | 170 | FALSE, /* partial_inplace */ |
adde6300 AM |
171 | 0xfff, /* src_mask */ |
172 | 0xfff, /* dst_mask */ | |
b34976b6 | 173 | TRUE), /* pcrel_offset */ |
adde6300 AM |
174 | |
175 | /* A 16 bit absolute relocation. */ | |
176 | HOWTO (R_AVR_16, /* type */ | |
177 | 0, /* rightshift */ | |
178 | 1, /* size (0 = byte, 1 = short, 2 = long) */ | |
179 | 16, /* bitsize */ | |
b34976b6 | 180 | FALSE, /* pc_relative */ |
adde6300 AM |
181 | 0, /* bitpos */ |
182 | complain_overflow_dont, /* complain_on_overflow */ | |
183 | bfd_elf_generic_reloc, /* special_function */ | |
184 | "R_AVR_16", /* name */ | |
b34976b6 | 185 | FALSE, /* partial_inplace */ |
adde6300 AM |
186 | 0xffff, /* src_mask */ |
187 | 0xffff, /* dst_mask */ | |
b34976b6 | 188 | FALSE), /* pcrel_offset */ |
adde6300 | 189 | |
28c9d252 NC |
190 | /* A 16 bit absolute relocation for command address |
191 | Will be changed when linker stubs are needed. */ | |
adde6300 AM |
192 | HOWTO (R_AVR_16_PM, /* type */ |
193 | 1, /* rightshift */ | |
194 | 1, /* size (0 = byte, 1 = short, 2 = long) */ | |
195 | 16, /* bitsize */ | |
b34976b6 | 196 | FALSE, /* pc_relative */ |
adde6300 AM |
197 | 0, /* bitpos */ |
198 | complain_overflow_bitfield, /* complain_on_overflow */ | |
199 | bfd_elf_generic_reloc, /* special_function */ | |
200 | "R_AVR_16_PM", /* name */ | |
b34976b6 | 201 | FALSE, /* partial_inplace */ |
adde6300 AM |
202 | 0xffff, /* src_mask */ |
203 | 0xffff, /* dst_mask */ | |
b34976b6 | 204 | FALSE), /* pcrel_offset */ |
adde6300 AM |
205 | /* A low 8 bit absolute relocation of 16 bit address. |
206 | For LDI command. */ | |
207 | HOWTO (R_AVR_LO8_LDI, /* type */ | |
208 | 0, /* rightshift */ | |
209 | 1, /* size (0 = byte, 1 = short, 2 = long) */ | |
210 | 8, /* bitsize */ | |
b34976b6 | 211 | FALSE, /* pc_relative */ |
adde6300 AM |
212 | 0, /* bitpos */ |
213 | complain_overflow_dont, /* complain_on_overflow */ | |
214 | bfd_elf_generic_reloc, /* special_function */ | |
215 | "R_AVR_LO8_LDI", /* name */ | |
b34976b6 | 216 | FALSE, /* partial_inplace */ |
adde6300 AM |
217 | 0xffff, /* src_mask */ |
218 | 0xffff, /* dst_mask */ | |
b34976b6 | 219 | FALSE), /* pcrel_offset */ |
adde6300 AM |
220 | /* A high 8 bit absolute relocation of 16 bit address. |
221 | For LDI command. */ | |
222 | HOWTO (R_AVR_HI8_LDI, /* type */ | |
223 | 8, /* rightshift */ | |
224 | 1, /* size (0 = byte, 1 = short, 2 = long) */ | |
225 | 8, /* bitsize */ | |
b34976b6 | 226 | FALSE, /* pc_relative */ |
adde6300 AM |
227 | 0, /* bitpos */ |
228 | complain_overflow_dont, /* complain_on_overflow */ | |
229 | bfd_elf_generic_reloc, /* special_function */ | |
230 | "R_AVR_HI8_LDI", /* name */ | |
b34976b6 | 231 | FALSE, /* partial_inplace */ |
adde6300 AM |
232 | 0xffff, /* src_mask */ |
233 | 0xffff, /* dst_mask */ | |
b34976b6 | 234 | FALSE), /* pcrel_offset */ |
adde6300 | 235 | /* A high 6 bit absolute relocation of 22 bit address. |
4cdc7696 | 236 | For LDI command. As well second most significant 8 bit value of |
df406460 | 237 | a 32 bit link-time constant. */ |
adde6300 AM |
238 | HOWTO (R_AVR_HH8_LDI, /* type */ |
239 | 16, /* rightshift */ | |
240 | 1, /* size (0 = byte, 1 = short, 2 = long) */ | |
241 | 8, /* bitsize */ | |
b34976b6 | 242 | FALSE, /* pc_relative */ |
adde6300 AM |
243 | 0, /* bitpos */ |
244 | complain_overflow_dont, /* complain_on_overflow */ | |
245 | bfd_elf_generic_reloc, /* special_function */ | |
246 | "R_AVR_HH8_LDI", /* name */ | |
b34976b6 | 247 | FALSE, /* partial_inplace */ |
adde6300 AM |
248 | 0xffff, /* src_mask */ |
249 | 0xffff, /* dst_mask */ | |
b34976b6 | 250 | FALSE), /* pcrel_offset */ |
adde6300 AM |
251 | /* A negative low 8 bit absolute relocation of 16 bit address. |
252 | For LDI command. */ | |
253 | HOWTO (R_AVR_LO8_LDI_NEG, /* type */ | |
254 | 0, /* rightshift */ | |
255 | 1, /* size (0 = byte, 1 = short, 2 = long) */ | |
256 | 8, /* bitsize */ | |
b34976b6 | 257 | FALSE, /* pc_relative */ |
adde6300 AM |
258 | 0, /* bitpos */ |
259 | complain_overflow_dont, /* complain_on_overflow */ | |
260 | bfd_elf_generic_reloc, /* special_function */ | |
261 | "R_AVR_LO8_LDI_NEG", /* name */ | |
b34976b6 | 262 | FALSE, /* partial_inplace */ |
adde6300 AM |
263 | 0xffff, /* src_mask */ |
264 | 0xffff, /* dst_mask */ | |
b34976b6 | 265 | FALSE), /* pcrel_offset */ |
df406460 | 266 | /* A negative high 8 bit absolute relocation of 16 bit address. |
adde6300 AM |
267 | For LDI command. */ |
268 | HOWTO (R_AVR_HI8_LDI_NEG, /* type */ | |
269 | 8, /* rightshift */ | |
270 | 1, /* size (0 = byte, 1 = short, 2 = long) */ | |
271 | 8, /* bitsize */ | |
b34976b6 | 272 | FALSE, /* pc_relative */ |
adde6300 AM |
273 | 0, /* bitpos */ |
274 | complain_overflow_dont, /* complain_on_overflow */ | |
275 | bfd_elf_generic_reloc, /* special_function */ | |
276 | "R_AVR_HI8_LDI_NEG", /* name */ | |
b34976b6 | 277 | FALSE, /* partial_inplace */ |
adde6300 AM |
278 | 0xffff, /* src_mask */ |
279 | 0xffff, /* dst_mask */ | |
b34976b6 | 280 | FALSE), /* pcrel_offset */ |
df406460 | 281 | /* A negative high 6 bit absolute relocation of 22 bit address. |
adde6300 AM |
282 | For LDI command. */ |
283 | HOWTO (R_AVR_HH8_LDI_NEG, /* type */ | |
284 | 16, /* rightshift */ | |
285 | 1, /* size (0 = byte, 1 = short, 2 = long) */ | |
286 | 8, /* bitsize */ | |
b34976b6 | 287 | FALSE, /* pc_relative */ |
adde6300 AM |
288 | 0, /* bitpos */ |
289 | complain_overflow_dont, /* complain_on_overflow */ | |
290 | bfd_elf_generic_reloc, /* special_function */ | |
291 | "R_AVR_HH8_LDI_NEG", /* name */ | |
b34976b6 | 292 | FALSE, /* partial_inplace */ |
adde6300 AM |
293 | 0xffff, /* src_mask */ |
294 | 0xffff, /* dst_mask */ | |
b34976b6 | 295 | FALSE), /* pcrel_offset */ |
adde6300 | 296 | /* A low 8 bit absolute relocation of 24 bit program memory address. |
28c9d252 | 297 | For LDI command. Will not be changed when linker stubs are needed. */ |
adde6300 AM |
298 | HOWTO (R_AVR_LO8_LDI_PM, /* type */ |
299 | 1, /* rightshift */ | |
300 | 1, /* size (0 = byte, 1 = short, 2 = long) */ | |
301 | 8, /* bitsize */ | |
b34976b6 | 302 | FALSE, /* pc_relative */ |
adde6300 AM |
303 | 0, /* bitpos */ |
304 | complain_overflow_dont, /* complain_on_overflow */ | |
305 | bfd_elf_generic_reloc, /* special_function */ | |
306 | "R_AVR_LO8_LDI_PM", /* name */ | |
b34976b6 | 307 | FALSE, /* partial_inplace */ |
adde6300 AM |
308 | 0xffff, /* src_mask */ |
309 | 0xffff, /* dst_mask */ | |
b34976b6 | 310 | FALSE), /* pcrel_offset */ |
28c9d252 NC |
311 | /* A low 8 bit absolute relocation of 24 bit program memory address. |
312 | For LDI command. Will not be changed when linker stubs are needed. */ | |
adde6300 AM |
313 | HOWTO (R_AVR_HI8_LDI_PM, /* type */ |
314 | 9, /* rightshift */ | |
315 | 1, /* size (0 = byte, 1 = short, 2 = long) */ | |
316 | 8, /* bitsize */ | |
b34976b6 | 317 | FALSE, /* pc_relative */ |
adde6300 AM |
318 | 0, /* bitpos */ |
319 | complain_overflow_dont, /* complain_on_overflow */ | |
320 | bfd_elf_generic_reloc, /* special_function */ | |
321 | "R_AVR_HI8_LDI_PM", /* name */ | |
b34976b6 | 322 | FALSE, /* partial_inplace */ |
adde6300 AM |
323 | 0xffff, /* src_mask */ |
324 | 0xffff, /* dst_mask */ | |
b34976b6 | 325 | FALSE), /* pcrel_offset */ |
28c9d252 NC |
326 | /* A low 8 bit absolute relocation of 24 bit program memory address. |
327 | For LDI command. Will not be changed when linker stubs are needed. */ | |
adde6300 AM |
328 | HOWTO (R_AVR_HH8_LDI_PM, /* type */ |
329 | 17, /* rightshift */ | |
330 | 1, /* size (0 = byte, 1 = short, 2 = long) */ | |
331 | 8, /* bitsize */ | |
b34976b6 | 332 | FALSE, /* pc_relative */ |
adde6300 AM |
333 | 0, /* bitpos */ |
334 | complain_overflow_dont, /* complain_on_overflow */ | |
335 | bfd_elf_generic_reloc, /* special_function */ | |
336 | "R_AVR_HH8_LDI_PM", /* name */ | |
b34976b6 | 337 | FALSE, /* partial_inplace */ |
adde6300 AM |
338 | 0xffff, /* src_mask */ |
339 | 0xffff, /* dst_mask */ | |
b34976b6 | 340 | FALSE), /* pcrel_offset */ |
28c9d252 NC |
341 | /* A low 8 bit absolute relocation of 24 bit program memory address. |
342 | For LDI command. Will not be changed when linker stubs are needed. */ | |
adde6300 AM |
343 | HOWTO (R_AVR_LO8_LDI_PM_NEG, /* type */ |
344 | 1, /* rightshift */ | |
345 | 1, /* size (0 = byte, 1 = short, 2 = long) */ | |
346 | 8, /* bitsize */ | |
b34976b6 | 347 | FALSE, /* pc_relative */ |
adde6300 AM |
348 | 0, /* bitpos */ |
349 | complain_overflow_dont, /* complain_on_overflow */ | |
350 | bfd_elf_generic_reloc, /* special_function */ | |
351 | "R_AVR_LO8_LDI_PM_NEG", /* name */ | |
b34976b6 | 352 | FALSE, /* partial_inplace */ |
adde6300 AM |
353 | 0xffff, /* src_mask */ |
354 | 0xffff, /* dst_mask */ | |
b34976b6 | 355 | FALSE), /* pcrel_offset */ |
28c9d252 NC |
356 | /* A low 8 bit absolute relocation of 24 bit program memory address. |
357 | For LDI command. Will not be changed when linker stubs are needed. */ | |
adde6300 AM |
358 | HOWTO (R_AVR_HI8_LDI_PM_NEG, /* type */ |
359 | 9, /* rightshift */ | |
360 | 1, /* size (0 = byte, 1 = short, 2 = long) */ | |
361 | 8, /* bitsize */ | |
b34976b6 | 362 | FALSE, /* pc_relative */ |
adde6300 AM |
363 | 0, /* bitpos */ |
364 | complain_overflow_dont, /* complain_on_overflow */ | |
365 | bfd_elf_generic_reloc, /* special_function */ | |
366 | "R_AVR_HI8_LDI_PM_NEG", /* name */ | |
b34976b6 | 367 | FALSE, /* partial_inplace */ |
adde6300 AM |
368 | 0xffff, /* src_mask */ |
369 | 0xffff, /* dst_mask */ | |
b34976b6 | 370 | FALSE), /* pcrel_offset */ |
28c9d252 NC |
371 | /* A low 8 bit absolute relocation of 24 bit program memory address. |
372 | For LDI command. Will not be changed when linker stubs are needed. */ | |
adde6300 AM |
373 | HOWTO (R_AVR_HH8_LDI_PM_NEG, /* type */ |
374 | 17, /* rightshift */ | |
375 | 1, /* size (0 = byte, 1 = short, 2 = long) */ | |
376 | 8, /* bitsize */ | |
b34976b6 | 377 | FALSE, /* pc_relative */ |
adde6300 AM |
378 | 0, /* bitpos */ |
379 | complain_overflow_dont, /* complain_on_overflow */ | |
380 | bfd_elf_generic_reloc, /* special_function */ | |
381 | "R_AVR_HH8_LDI_PM_NEG", /* name */ | |
b34976b6 | 382 | FALSE, /* partial_inplace */ |
adde6300 AM |
383 | 0xffff, /* src_mask */ |
384 | 0xffff, /* dst_mask */ | |
b34976b6 | 385 | FALSE), /* pcrel_offset */ |
adde6300 AM |
386 | /* Relocation for CALL command in ATmega. */ |
387 | HOWTO (R_AVR_CALL, /* type */ | |
388 | 1, /* rightshift */ | |
389 | 2, /* size (0 = byte, 1 = short, 2 = long) */ | |
390 | 23, /* bitsize */ | |
b34976b6 | 391 | FALSE, /* pc_relative */ |
adde6300 | 392 | 0, /* bitpos */ |
750bce0e | 393 | complain_overflow_dont,/* complain_on_overflow */ |
adde6300 AM |
394 | bfd_elf_generic_reloc, /* special_function */ |
395 | "R_AVR_CALL", /* name */ | |
b34976b6 | 396 | FALSE, /* partial_inplace */ |
adde6300 AM |
397 | 0xffffffff, /* src_mask */ |
398 | 0xffffffff, /* dst_mask */ | |
750bce0e NC |
399 | FALSE), /* pcrel_offset */ |
400 | /* A 16 bit absolute relocation of 16 bit address. | |
401 | For LDI command. */ | |
402 | HOWTO (R_AVR_LDI, /* type */ | |
403 | 0, /* rightshift */ | |
404 | 1, /* size (0 = byte, 1 = short, 2 = long) */ | |
405 | 16, /* bitsize */ | |
406 | FALSE, /* pc_relative */ | |
407 | 0, /* bitpos */ | |
408 | complain_overflow_dont,/* complain_on_overflow */ | |
409 | bfd_elf_generic_reloc, /* special_function */ | |
410 | "R_AVR_LDI", /* name */ | |
411 | FALSE, /* partial_inplace */ | |
412 | 0xffff, /* src_mask */ | |
413 | 0xffff, /* dst_mask */ | |
414 | FALSE), /* pcrel_offset */ | |
415 | /* A 6 bit absolute relocation of 6 bit offset. | |
416 | For ldd/sdd command. */ | |
417 | HOWTO (R_AVR_6, /* type */ | |
418 | 0, /* rightshift */ | |
419 | 0, /* size (0 = byte, 1 = short, 2 = long) */ | |
420 | 6, /* bitsize */ | |
421 | FALSE, /* pc_relative */ | |
422 | 0, /* bitpos */ | |
423 | complain_overflow_dont,/* complain_on_overflow */ | |
424 | bfd_elf_generic_reloc, /* special_function */ | |
425 | "R_AVR_6", /* name */ | |
426 | FALSE, /* partial_inplace */ | |
427 | 0xffff, /* src_mask */ | |
428 | 0xffff, /* dst_mask */ | |
429 | FALSE), /* pcrel_offset */ | |
430 | /* A 6 bit absolute relocation of 6 bit offset. | |
431 | For sbiw/adiw command. */ | |
432 | HOWTO (R_AVR_6_ADIW, /* type */ | |
433 | 0, /* rightshift */ | |
434 | 0, /* size (0 = byte, 1 = short, 2 = long) */ | |
435 | 6, /* bitsize */ | |
436 | FALSE, /* pc_relative */ | |
437 | 0, /* bitpos */ | |
438 | complain_overflow_dont,/* complain_on_overflow */ | |
439 | bfd_elf_generic_reloc, /* special_function */ | |
440 | "R_AVR_6_ADIW", /* name */ | |
441 | FALSE, /* partial_inplace */ | |
442 | 0xffff, /* src_mask */ | |
443 | 0xffff, /* dst_mask */ | |
df406460 NC |
444 | FALSE), /* pcrel_offset */ |
445 | /* Most significant 8 bit value of a 32 bit link-time constant. */ | |
446 | HOWTO (R_AVR_MS8_LDI, /* type */ | |
447 | 24, /* rightshift */ | |
448 | 1, /* size (0 = byte, 1 = short, 2 = long) */ | |
449 | 8, /* bitsize */ | |
450 | FALSE, /* pc_relative */ | |
451 | 0, /* bitpos */ | |
452 | complain_overflow_dont, /* complain_on_overflow */ | |
453 | bfd_elf_generic_reloc, /* special_function */ | |
454 | "R_AVR_MS8_LDI", /* name */ | |
455 | FALSE, /* partial_inplace */ | |
456 | 0xffff, /* src_mask */ | |
457 | 0xffff, /* dst_mask */ | |
458 | FALSE), /* pcrel_offset */ | |
459 | /* Negative most significant 8 bit value of a 32 bit link-time constant. */ | |
460 | HOWTO (R_AVR_MS8_LDI_NEG, /* type */ | |
461 | 24, /* rightshift */ | |
462 | 1, /* size (0 = byte, 1 = short, 2 = long) */ | |
463 | 8, /* bitsize */ | |
464 | FALSE, /* pc_relative */ | |
465 | 0, /* bitpos */ | |
466 | complain_overflow_dont, /* complain_on_overflow */ | |
467 | bfd_elf_generic_reloc, /* special_function */ | |
468 | "R_AVR_MS8_LDI_NEG", /* name */ | |
469 | FALSE, /* partial_inplace */ | |
470 | 0xffff, /* src_mask */ | |
471 | 0xffff, /* dst_mask */ | |
28c9d252 NC |
472 | FALSE), /* pcrel_offset */ |
473 | /* A low 8 bit absolute relocation of 24 bit program memory address. | |
474 | For LDI command. Will be changed when linker stubs are needed. */ | |
475 | HOWTO (R_AVR_LO8_LDI_GS, /* type */ | |
476 | 1, /* rightshift */ | |
477 | 1, /* size (0 = byte, 1 = short, 2 = long) */ | |
478 | 8, /* bitsize */ | |
479 | FALSE, /* pc_relative */ | |
480 | 0, /* bitpos */ | |
481 | complain_overflow_dont, /* complain_on_overflow */ | |
482 | bfd_elf_generic_reloc, /* special_function */ | |
483 | "R_AVR_LO8_LDI_GS", /* name */ | |
484 | FALSE, /* partial_inplace */ | |
485 | 0xffff, /* src_mask */ | |
486 | 0xffff, /* dst_mask */ | |
487 | FALSE), /* pcrel_offset */ | |
488 | /* A low 8 bit absolute relocation of 24 bit program memory address. | |
489 | For LDI command. Will be changed when linker stubs are needed. */ | |
490 | HOWTO (R_AVR_HI8_LDI_GS, /* type */ | |
491 | 9, /* rightshift */ | |
492 | 1, /* size (0 = byte, 1 = short, 2 = long) */ | |
493 | 8, /* bitsize */ | |
494 | FALSE, /* pc_relative */ | |
495 | 0, /* bitpos */ | |
496 | complain_overflow_dont, /* complain_on_overflow */ | |
497 | bfd_elf_generic_reloc, /* special_function */ | |
498 | "R_AVR_HI8_LDI_GS", /* name */ | |
499 | FALSE, /* partial_inplace */ | |
500 | 0xffff, /* src_mask */ | |
501 | 0xffff, /* dst_mask */ | |
502 | FALSE) /* pcrel_offset */ | |
adde6300 AM |
503 | }; |
504 | ||
505 | /* Map BFD reloc types to AVR ELF reloc types. */ | |
506 | ||
507 | struct avr_reloc_map | |
508 | { | |
509 | bfd_reloc_code_real_type bfd_reloc_val; | |
510 | unsigned int elf_reloc_val; | |
511 | }; | |
512 | ||
28c9d252 | 513 | static const struct avr_reloc_map avr_reloc_map[] = |
adde6300 AM |
514 | { |
515 | { BFD_RELOC_NONE, R_AVR_NONE }, | |
516 | { BFD_RELOC_32, R_AVR_32 }, | |
517 | { BFD_RELOC_AVR_7_PCREL, R_AVR_7_PCREL }, | |
518 | { BFD_RELOC_AVR_13_PCREL, R_AVR_13_PCREL }, | |
519 | { BFD_RELOC_16, R_AVR_16 }, | |
520 | { BFD_RELOC_AVR_16_PM, R_AVR_16_PM }, | |
521 | { BFD_RELOC_AVR_LO8_LDI, R_AVR_LO8_LDI}, | |
522 | { BFD_RELOC_AVR_HI8_LDI, R_AVR_HI8_LDI }, | |
523 | { BFD_RELOC_AVR_HH8_LDI, R_AVR_HH8_LDI }, | |
df406460 | 524 | { BFD_RELOC_AVR_MS8_LDI, R_AVR_MS8_LDI }, |
adde6300 AM |
525 | { BFD_RELOC_AVR_LO8_LDI_NEG, R_AVR_LO8_LDI_NEG }, |
526 | { BFD_RELOC_AVR_HI8_LDI_NEG, R_AVR_HI8_LDI_NEG }, | |
527 | { BFD_RELOC_AVR_HH8_LDI_NEG, R_AVR_HH8_LDI_NEG }, | |
df406460 | 528 | { BFD_RELOC_AVR_MS8_LDI_NEG, R_AVR_MS8_LDI_NEG }, |
adde6300 | 529 | { BFD_RELOC_AVR_LO8_LDI_PM, R_AVR_LO8_LDI_PM }, |
28c9d252 | 530 | { BFD_RELOC_AVR_LO8_LDI_GS, R_AVR_LO8_LDI_GS }, |
adde6300 | 531 | { BFD_RELOC_AVR_HI8_LDI_PM, R_AVR_HI8_LDI_PM }, |
28c9d252 | 532 | { BFD_RELOC_AVR_HI8_LDI_GS, R_AVR_HI8_LDI_GS }, |
adde6300 AM |
533 | { BFD_RELOC_AVR_HH8_LDI_PM, R_AVR_HH8_LDI_PM }, |
534 | { BFD_RELOC_AVR_LO8_LDI_PM_NEG, R_AVR_LO8_LDI_PM_NEG }, | |
535 | { BFD_RELOC_AVR_HI8_LDI_PM_NEG, R_AVR_HI8_LDI_PM_NEG }, | |
536 | { BFD_RELOC_AVR_HH8_LDI_PM_NEG, R_AVR_HH8_LDI_PM_NEG }, | |
750bce0e NC |
537 | { BFD_RELOC_AVR_CALL, R_AVR_CALL }, |
538 | { BFD_RELOC_AVR_LDI, R_AVR_LDI }, | |
539 | { BFD_RELOC_AVR_6, R_AVR_6 }, | |
540 | { BFD_RELOC_AVR_6_ADIW, R_AVR_6_ADIW } | |
adde6300 AM |
541 | }; |
542 | ||
df406460 | 543 | /* Meant to be filled one day with the wrap around address for the |
4cdc7696 | 544 | specific device. I.e. should get the value 0x4000 for 16k devices, |
df406460 | 545 | 0x8000 for 32k devices and so on. |
4cdc7696 | 546 | |
df406460 | 547 | We initialize it here with a value of 0x1000000 resulting in |
4cdc7696 NC |
548 | that we will never suggest a wrap-around jump during relaxation. |
549 | The logic of the source code later on assumes that in | |
df406460 | 550 | avr_pc_wrap_around one single bit is set. */ |
28c9d252 NC |
551 | static bfd_vma avr_pc_wrap_around = 0x10000000; |
552 | ||
553 | /* If this variable holds a value different from zero, the linker relaxation | |
554 | machine will try to optimize call/ret sequences by a single jump | |
555 | instruction. This option could be switched off by a linker switch. */ | |
556 | static int avr_replace_call_ret_sequences = 1; | |
557 | \f | |
558 | /* Initialize an entry in the stub hash table. */ | |
559 | ||
560 | static struct bfd_hash_entry * | |
561 | stub_hash_newfunc (struct bfd_hash_entry *entry, | |
562 | struct bfd_hash_table *table, | |
563 | const char *string) | |
564 | { | |
565 | /* Allocate the structure if it has not already been allocated by a | |
566 | subclass. */ | |
567 | if (entry == NULL) | |
568 | { | |
569 | entry = bfd_hash_allocate (table, | |
570 | sizeof (struct elf32_avr_stub_hash_entry)); | |
571 | if (entry == NULL) | |
572 | return entry; | |
573 | } | |
574 | ||
575 | /* Call the allocation method of the superclass. */ | |
576 | entry = bfd_hash_newfunc (entry, table, string); | |
577 | if (entry != NULL) | |
578 | { | |
579 | struct elf32_avr_stub_hash_entry *hsh; | |
580 | ||
581 | /* Initialize the local fields. */ | |
582 | hsh = avr_stub_hash_entry (entry); | |
583 | hsh->stub_offset = 0; | |
584 | hsh->target_value = 0; | |
585 | } | |
586 | ||
587 | return entry; | |
588 | } | |
589 | ||
590 | /* Create the derived linker hash table. The AVR ELF port uses the derived | |
591 | hash table to keep information specific to the AVR ELF linker (without | |
592 | using static variables). */ | |
593 | ||
594 | static struct bfd_link_hash_table * | |
595 | elf32_avr_link_hash_table_create (bfd *abfd) | |
596 | { | |
597 | struct elf32_avr_link_hash_table *htab; | |
598 | bfd_size_type amt = sizeof (*htab); | |
599 | ||
600 | htab = bfd_malloc (amt); | |
601 | if (htab == NULL) | |
602 | return NULL; | |
603 | ||
604 | if (!_bfd_elf_link_hash_table_init (&htab->etab, abfd, | |
605 | _bfd_elf_link_hash_newfunc, | |
606 | sizeof (struct elf_link_hash_entry))) | |
607 | { | |
608 | free (htab); | |
609 | return NULL; | |
610 | } | |
611 | ||
612 | /* Init the stub hash table too. */ | |
613 | if (!bfd_hash_table_init (&htab->bstab, stub_hash_newfunc, | |
614 | sizeof (struct elf32_avr_stub_hash_entry))) | |
615 | return NULL; | |
4cdc7696 | 616 | |
28c9d252 NC |
617 | htab->stub_bfd = NULL; |
618 | htab->stub_sec = NULL; | |
619 | ||
620 | /* Initialize the address mapping table. */ | |
621 | htab->amt_stub_offsets = NULL; | |
622 | htab->amt_destination_addr = NULL; | |
623 | htab->amt_entry_cnt = 0; | |
624 | htab->amt_max_entry_cnt = 0; | |
625 | ||
626 | return &htab->etab.root; | |
627 | } | |
628 | ||
629 | /* Free the derived linker hash table. */ | |
630 | ||
631 | static void | |
632 | elf32_avr_link_hash_table_free (struct bfd_link_hash_table *btab) | |
633 | { | |
634 | struct elf32_avr_link_hash_table *htab | |
635 | = (struct elf32_avr_link_hash_table *) btab; | |
636 | ||
637 | /* Free the address mapping table. */ | |
638 | if (htab->amt_stub_offsets != NULL) | |
639 | free (htab->amt_stub_offsets); | |
640 | if (htab->amt_destination_addr != NULL) | |
641 | free (htab->amt_destination_addr); | |
642 | ||
643 | bfd_hash_table_free (&htab->bstab); | |
644 | _bfd_generic_link_hash_table_free (btab); | |
645 | } | |
df406460 NC |
646 | |
647 | /* Calculates the effective distance of a pc relative jump/call. */ | |
73160847 | 648 | |
df406460 NC |
649 | static int |
650 | avr_relative_distance_considering_wrap_around (unsigned int distance) | |
4cdc7696 | 651 | { |
df406460 | 652 | unsigned int wrap_around_mask = avr_pc_wrap_around - 1; |
df406460 NC |
653 | int dist_with_wrap_around = distance & wrap_around_mask; |
654 | ||
4cdc7696 | 655 | if (dist_with_wrap_around > ((int) (avr_pc_wrap_around >> 1))) |
df406460 NC |
656 | dist_with_wrap_around -= avr_pc_wrap_around; |
657 | ||
658 | return dist_with_wrap_around; | |
659 | } | |
660 | ||
661 | ||
adde6300 | 662 | static reloc_howto_type * |
4cdc7696 NC |
663 | bfd_elf32_bfd_reloc_type_lookup (bfd *abfd ATTRIBUTE_UNUSED, |
664 | bfd_reloc_code_real_type code) | |
adde6300 AM |
665 | { |
666 | unsigned int i; | |
667 | ||
668 | for (i = 0; | |
669 | i < sizeof (avr_reloc_map) / sizeof (struct avr_reloc_map); | |
670 | i++) | |
73160847 NC |
671 | if (avr_reloc_map[i].bfd_reloc_val == code) |
672 | return &elf_avr_howto_table[avr_reloc_map[i].elf_reloc_val]; | |
adde6300 AM |
673 | |
674 | return NULL; | |
675 | } | |
676 | ||
677 | /* Set the howto pointer for an AVR ELF reloc. */ | |
678 | ||
679 | static void | |
4cdc7696 NC |
680 | avr_info_to_howto_rela (bfd *abfd ATTRIBUTE_UNUSED, |
681 | arelent *cache_ptr, | |
682 | Elf_Internal_Rela *dst) | |
adde6300 AM |
683 | { |
684 | unsigned int r_type; | |
685 | ||
686 | r_type = ELF32_R_TYPE (dst->r_info); | |
687 | BFD_ASSERT (r_type < (unsigned int) R_AVR_max); | |
688 | cache_ptr->howto = &elf_avr_howto_table[r_type]; | |
689 | } | |
690 | ||
adde6300 AM |
691 | /* Look through the relocs for a section during the first phase. |
692 | Since we don't do .gots or .plts, we just need to consider the | |
693 | virtual table relocs for gc. */ | |
694 | ||
b34976b6 | 695 | static bfd_boolean |
4cdc7696 NC |
696 | elf32_avr_check_relocs (bfd *abfd, |
697 | struct bfd_link_info *info, | |
698 | asection *sec, | |
699 | const Elf_Internal_Rela *relocs) | |
adde6300 AM |
700 | { |
701 | Elf_Internal_Shdr *symtab_hdr; | |
702 | struct elf_link_hash_entry **sym_hashes, **sym_hashes_end; | |
703 | const Elf_Internal_Rela *rel; | |
704 | const Elf_Internal_Rela *rel_end; | |
705 | ||
1049f94e | 706 | if (info->relocatable) |
b34976b6 | 707 | return TRUE; |
adde6300 AM |
708 | |
709 | symtab_hdr = &elf_tdata (abfd)->symtab_hdr; | |
710 | sym_hashes = elf_sym_hashes (abfd); | |
4cdc7696 | 711 | sym_hashes_end = sym_hashes + symtab_hdr->sh_size / sizeof (Elf32_External_Sym); |
adde6300 AM |
712 | if (!elf_bad_symtab (abfd)) |
713 | sym_hashes_end -= symtab_hdr->sh_info; | |
714 | ||
715 | rel_end = relocs + sec->reloc_count; | |
716 | for (rel = relocs; rel < rel_end; rel++) | |
717 | { | |
718 | struct elf_link_hash_entry *h; | |
719 | unsigned long r_symndx; | |
720 | ||
721 | r_symndx = ELF32_R_SYM (rel->r_info); | |
722 | if (r_symndx < symtab_hdr->sh_info) | |
723 | h = NULL; | |
724 | else | |
973a3492 L |
725 | { |
726 | h = sym_hashes[r_symndx - symtab_hdr->sh_info]; | |
727 | while (h->root.type == bfd_link_hash_indirect | |
728 | || h->root.type == bfd_link_hash_warning) | |
729 | h = (struct elf_link_hash_entry *) h->root.u.i.link; | |
730 | } | |
adde6300 AM |
731 | } |
732 | ||
b34976b6 | 733 | return TRUE; |
adde6300 AM |
734 | } |
735 | ||
28c9d252 NC |
736 | static bfd_boolean |
737 | avr_stub_is_required_for_16_bit_reloc (bfd_vma relocation) | |
738 | { | |
739 | return (relocation >= 0x020000); | |
740 | } | |
741 | ||
742 | /* Returns the address of the corresponding stub if there is one. | |
743 | Returns otherwise an address above 0x020000. This function | |
744 | could also be used, if there is no knowledge on the section where | |
745 | the destination is found. */ | |
746 | ||
747 | static bfd_vma | |
748 | avr_get_stub_addr (bfd_vma srel, | |
749 | struct elf32_avr_link_hash_table *htab) | |
750 | { | |
751 | unsigned int index; | |
752 | bfd_vma stub_sec_addr = | |
753 | (htab->stub_sec->output_section->vma + | |
754 | htab->stub_sec->output_offset); | |
755 | ||
756 | for (index = 0; index < htab->amt_max_entry_cnt; index ++) | |
757 | if (htab->amt_destination_addr[index] == srel) | |
758 | return htab->amt_stub_offsets[index] + stub_sec_addr; | |
759 | ||
760 | /* Return an address that could not be reached by 16 bit relocs. */ | |
761 | return 0x020000; | |
762 | } | |
763 | ||
adde6300 AM |
764 | /* Perform a single relocation. By default we use the standard BFD |
765 | routines, but a few relocs, we have to do them ourselves. */ | |
766 | ||
767 | static bfd_reloc_status_type | |
28c9d252 NC |
768 | avr_final_link_relocate (reloc_howto_type * howto, |
769 | bfd * input_bfd, | |
770 | asection * input_section, | |
771 | bfd_byte * contents, | |
772 | Elf_Internal_Rela * rel, | |
773 | bfd_vma relocation, | |
774 | struct elf32_avr_link_hash_table * htab) | |
adde6300 AM |
775 | { |
776 | bfd_reloc_status_type r = bfd_reloc_ok; | |
777 | bfd_vma x; | |
778 | bfd_signed_vma srel; | |
28c9d252 NC |
779 | bfd_signed_vma reloc_addr; |
780 | bfd_boolean use_stubs = FALSE; | |
781 | /* Usually is 0, unless we are generating code for a bootloader. */ | |
782 | bfd_signed_vma base_addr = htab->vector_base; | |
783 | ||
784 | /* Absolute addr of the reloc in the final excecutable. */ | |
785 | reloc_addr = rel->r_offset + input_section->output_section->vma | |
786 | + input_section->output_offset; | |
adde6300 AM |
787 | |
788 | switch (howto->type) | |
789 | { | |
790 | case R_AVR_7_PCREL: | |
791 | contents += rel->r_offset; | |
792 | srel = (bfd_signed_vma) relocation; | |
793 | srel += rel->r_addend; | |
794 | srel -= rel->r_offset; | |
a7c10850 | 795 | srel -= 2; /* Branch instructions add 2 to the PC... */ |
adde6300 AM |
796 | srel -= (input_section->output_section->vma + |
797 | input_section->output_offset); | |
798 | ||
799 | if (srel & 1) | |
800 | return bfd_reloc_outofrange; | |
801 | if (srel > ((1 << 7) - 1) || (srel < - (1 << 7))) | |
802 | return bfd_reloc_overflow; | |
803 | x = bfd_get_16 (input_bfd, contents); | |
804 | x = (x & 0xfc07) | (((srel >> 1) << 3) & 0x3f8); | |
805 | bfd_put_16 (input_bfd, x, contents); | |
806 | break; | |
807 | ||
808 | case R_AVR_13_PCREL: | |
809 | contents += rel->r_offset; | |
810 | srel = (bfd_signed_vma) relocation; | |
811 | srel += rel->r_addend; | |
812 | srel -= rel->r_offset; | |
a7c10850 | 813 | srel -= 2; /* Branch instructions add 2 to the PC... */ |
adde6300 AM |
814 | srel -= (input_section->output_section->vma + |
815 | input_section->output_offset); | |
816 | ||
817 | if (srel & 1) | |
818 | return bfd_reloc_outofrange; | |
819 | ||
df406460 NC |
820 | srel = avr_relative_distance_considering_wrap_around (srel); |
821 | ||
adde6300 AM |
822 | /* AVR addresses commands as words. */ |
823 | srel >>= 1; | |
824 | ||
825 | /* Check for overflow. */ | |
826 | if (srel < -2048 || srel > 2047) | |
827 | { | |
df406460 NC |
828 | /* Relative distance is too large. */ |
829 | ||
830 | /* Always apply WRAPAROUND for avr2 and avr4. */ | |
65aa24b6 | 831 | switch (bfd_get_mach (input_bfd)) |
adde6300 | 832 | { |
65aa24b6 NC |
833 | case bfd_mach_avr2: |
834 | case bfd_mach_avr4: | |
835 | break; | |
836 | ||
837 | default: | |
838 | return bfd_reloc_overflow; | |
adde6300 | 839 | } |
adde6300 AM |
840 | } |
841 | ||
842 | x = bfd_get_16 (input_bfd, contents); | |
843 | x = (x & 0xf000) | (srel & 0xfff); | |
844 | bfd_put_16 (input_bfd, x, contents); | |
845 | break; | |
846 | ||
847 | case R_AVR_LO8_LDI: | |
848 | contents += rel->r_offset; | |
849 | srel = (bfd_signed_vma) relocation + rel->r_addend; | |
850 | x = bfd_get_16 (input_bfd, contents); | |
851 | x = (x & 0xf0f0) | (srel & 0xf) | ((srel << 4) & 0xf00); | |
852 | bfd_put_16 (input_bfd, x, contents); | |
853 | break; | |
854 | ||
750bce0e NC |
855 | case R_AVR_LDI: |
856 | contents += rel->r_offset; | |
857 | srel = (bfd_signed_vma) relocation + rel->r_addend; | |
4cdc7696 NC |
858 | if (((srel > 0) && (srel & 0xffff) > 255) |
859 | || ((srel < 0) && ((-srel) & 0xffff) > 128)) | |
df406460 NC |
860 | /* Remove offset for data/eeprom section. */ |
861 | return bfd_reloc_overflow; | |
862 | ||
750bce0e NC |
863 | x = bfd_get_16 (input_bfd, contents); |
864 | x = (x & 0xf0f0) | (srel & 0xf) | ((srel << 4) & 0xf00); | |
865 | bfd_put_16 (input_bfd, x, contents); | |
866 | break; | |
867 | ||
868 | case R_AVR_6: | |
869 | contents += rel->r_offset; | |
870 | srel = (bfd_signed_vma) relocation + rel->r_addend; | |
871 | if (((srel & 0xffff) > 63) || (srel < 0)) | |
872 | /* Remove offset for data/eeprom section. */ | |
873 | return bfd_reloc_overflow; | |
874 | x = bfd_get_16 (input_bfd, contents); | |
4cdc7696 | 875 | x = (x & 0xd3f8) | ((srel & 7) | ((srel & (3 << 3)) << 7) |
df406460 | 876 | | ((srel & (1 << 5)) << 8)); |
750bce0e NC |
877 | bfd_put_16 (input_bfd, x, contents); |
878 | break; | |
879 | ||
880 | case R_AVR_6_ADIW: | |
881 | contents += rel->r_offset; | |
882 | srel = (bfd_signed_vma) relocation + rel->r_addend; | |
883 | if (((srel & 0xffff) > 63) || (srel < 0)) | |
884 | /* Remove offset for data/eeprom section. */ | |
885 | return bfd_reloc_overflow; | |
886 | x = bfd_get_16 (input_bfd, contents); | |
4cdc7696 | 887 | x = (x & 0xff30) | (srel & 0xf) | ((srel & 0x30) << 2); |
750bce0e NC |
888 | bfd_put_16 (input_bfd, x, contents); |
889 | break; | |
890 | ||
adde6300 AM |
891 | case R_AVR_HI8_LDI: |
892 | contents += rel->r_offset; | |
893 | srel = (bfd_signed_vma) relocation + rel->r_addend; | |
894 | srel = (srel >> 8) & 0xff; | |
895 | x = bfd_get_16 (input_bfd, contents); | |
896 | x = (x & 0xf0f0) | (srel & 0xf) | ((srel << 4) & 0xf00); | |
897 | bfd_put_16 (input_bfd, x, contents); | |
898 | break; | |
899 | ||
900 | case R_AVR_HH8_LDI: | |
901 | contents += rel->r_offset; | |
902 | srel = (bfd_signed_vma) relocation + rel->r_addend; | |
903 | srel = (srel >> 16) & 0xff; | |
904 | x = bfd_get_16 (input_bfd, contents); | |
905 | x = (x & 0xf0f0) | (srel & 0xf) | ((srel << 4) & 0xf00); | |
906 | bfd_put_16 (input_bfd, x, contents); | |
907 | break; | |
908 | ||
df406460 NC |
909 | case R_AVR_MS8_LDI: |
910 | contents += rel->r_offset; | |
911 | srel = (bfd_signed_vma) relocation + rel->r_addend; | |
912 | srel = (srel >> 24) & 0xff; | |
913 | x = bfd_get_16 (input_bfd, contents); | |
914 | x = (x & 0xf0f0) | (srel & 0xf) | ((srel << 4) & 0xf00); | |
915 | bfd_put_16 (input_bfd, x, contents); | |
916 | break; | |
917 | ||
adde6300 AM |
918 | case R_AVR_LO8_LDI_NEG: |
919 | contents += rel->r_offset; | |
920 | srel = (bfd_signed_vma) relocation + rel->r_addend; | |
921 | srel = -srel; | |
922 | x = bfd_get_16 (input_bfd, contents); | |
923 | x = (x & 0xf0f0) | (srel & 0xf) | ((srel << 4) & 0xf00); | |
924 | bfd_put_16 (input_bfd, x, contents); | |
925 | break; | |
926 | ||
927 | case R_AVR_HI8_LDI_NEG: | |
928 | contents += rel->r_offset; | |
929 | srel = (bfd_signed_vma) relocation + rel->r_addend; | |
930 | srel = -srel; | |
931 | srel = (srel >> 8) & 0xff; | |
932 | x = bfd_get_16 (input_bfd, contents); | |
933 | x = (x & 0xf0f0) | (srel & 0xf) | ((srel << 4) & 0xf00); | |
934 | bfd_put_16 (input_bfd, x, contents); | |
935 | break; | |
936 | ||
937 | case R_AVR_HH8_LDI_NEG: | |
938 | contents += rel->r_offset; | |
939 | srel = (bfd_signed_vma) relocation + rel->r_addend; | |
940 | srel = -srel; | |
941 | srel = (srel >> 16) & 0xff; | |
942 | x = bfd_get_16 (input_bfd, contents); | |
943 | x = (x & 0xf0f0) | (srel & 0xf) | ((srel << 4) & 0xf00); | |
944 | bfd_put_16 (input_bfd, x, contents); | |
945 | break; | |
946 | ||
df406460 NC |
947 | case R_AVR_MS8_LDI_NEG: |
948 | contents += rel->r_offset; | |
949 | srel = (bfd_signed_vma) relocation + rel->r_addend; | |
950 | srel = -srel; | |
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 | ||
28c9d252 NC |
957 | case R_AVR_LO8_LDI_GS: |
958 | use_stubs = (!htab->no_stubs); | |
959 | /* Fall through. */ | |
adde6300 AM |
960 | case R_AVR_LO8_LDI_PM: |
961 | contents += rel->r_offset; | |
962 | srel = (bfd_signed_vma) relocation + rel->r_addend; | |
28c9d252 NC |
963 | |
964 | if (use_stubs | |
965 | && avr_stub_is_required_for_16_bit_reloc (srel - base_addr)) | |
966 | { | |
967 | bfd_vma old_srel = srel; | |
968 | ||
969 | /* We need to use the address of the stub instead. */ | |
970 | srel = avr_get_stub_addr (srel, htab); | |
971 | if (debug_stubs) | |
972 | printf ("LD: Using jump stub (at 0x%x) with destination 0x%x for " | |
973 | "reloc at address 0x%x.\n", | |
974 | (unsigned int) srel, | |
975 | (unsigned int) old_srel, | |
976 | (unsigned int) reloc_addr); | |
977 | ||
978 | if (avr_stub_is_required_for_16_bit_reloc (srel - base_addr)) | |
979 | return bfd_reloc_outofrange; | |
980 | } | |
981 | ||
adde6300 AM |
982 | if (srel & 1) |
983 | return bfd_reloc_outofrange; | |
984 | srel = srel >> 1; | |
985 | x = bfd_get_16 (input_bfd, contents); | |
986 | x = (x & 0xf0f0) | (srel & 0xf) | ((srel << 4) & 0xf00); | |
987 | bfd_put_16 (input_bfd, x, contents); | |
988 | break; | |
989 | ||
28c9d252 NC |
990 | case R_AVR_HI8_LDI_GS: |
991 | use_stubs = (!htab->no_stubs); | |
992 | /* Fall through. */ | |
adde6300 AM |
993 | case R_AVR_HI8_LDI_PM: |
994 | contents += rel->r_offset; | |
995 | srel = (bfd_signed_vma) relocation + rel->r_addend; | |
28c9d252 NC |
996 | |
997 | if (use_stubs | |
998 | && avr_stub_is_required_for_16_bit_reloc (srel - base_addr)) | |
999 | { | |
1000 | bfd_vma old_srel = srel; | |
1001 | ||
1002 | /* We need to use the address of the stub instead. */ | |
1003 | srel = avr_get_stub_addr (srel, htab); | |
1004 | if (debug_stubs) | |
1005 | printf ("LD: Using jump stub (at 0x%x) with destination 0x%x for " | |
1006 | "reloc at address 0x%x.\n", | |
1007 | (unsigned int) srel, | |
1008 | (unsigned int) old_srel, | |
1009 | (unsigned int) reloc_addr); | |
1010 | ||
1011 | if (avr_stub_is_required_for_16_bit_reloc (srel - base_addr)) | |
1012 | return bfd_reloc_outofrange; | |
1013 | } | |
1014 | ||
adde6300 AM |
1015 | if (srel & 1) |
1016 | return bfd_reloc_outofrange; | |
1017 | srel = srel >> 1; | |
1018 | srel = (srel >> 8) & 0xff; | |
1019 | x = bfd_get_16 (input_bfd, contents); | |
1020 | x = (x & 0xf0f0) | (srel & 0xf) | ((srel << 4) & 0xf00); | |
1021 | bfd_put_16 (input_bfd, x, contents); | |
1022 | break; | |
1023 | ||
1024 | case R_AVR_HH8_LDI_PM: | |
1025 | contents += rel->r_offset; | |
1026 | srel = (bfd_signed_vma) relocation + rel->r_addend; | |
1027 | if (srel & 1) | |
1028 | return bfd_reloc_outofrange; | |
1029 | srel = srel >> 1; | |
1030 | srel = (srel >> 16) & 0xff; | |
1031 | x = bfd_get_16 (input_bfd, contents); | |
1032 | x = (x & 0xf0f0) | (srel & 0xf) | ((srel << 4) & 0xf00); | |
1033 | bfd_put_16 (input_bfd, x, contents); | |
1034 | break; | |
1035 | ||
1036 | case R_AVR_LO8_LDI_PM_NEG: | |
1037 | contents += rel->r_offset; | |
1038 | srel = (bfd_signed_vma) relocation + rel->r_addend; | |
1039 | srel = -srel; | |
1040 | if (srel & 1) | |
1041 | return bfd_reloc_outofrange; | |
1042 | srel = srel >> 1; | |
1043 | x = bfd_get_16 (input_bfd, contents); | |
1044 | x = (x & 0xf0f0) | (srel & 0xf) | ((srel << 4) & 0xf00); | |
1045 | bfd_put_16 (input_bfd, x, contents); | |
1046 | break; | |
1047 | ||
1048 | case R_AVR_HI8_LDI_PM_NEG: | |
1049 | contents += rel->r_offset; | |
1050 | srel = (bfd_signed_vma) relocation + rel->r_addend; | |
1051 | srel = -srel; | |
1052 | if (srel & 1) | |
1053 | return bfd_reloc_outofrange; | |
1054 | srel = srel >> 1; | |
1055 | srel = (srel >> 8) & 0xff; | |
1056 | x = bfd_get_16 (input_bfd, contents); | |
1057 | x = (x & 0xf0f0) | (srel & 0xf) | ((srel << 4) & 0xf00); | |
1058 | bfd_put_16 (input_bfd, x, contents); | |
1059 | break; | |
1060 | ||
1061 | case R_AVR_HH8_LDI_PM_NEG: | |
1062 | contents += rel->r_offset; | |
1063 | srel = (bfd_signed_vma) relocation + rel->r_addend; | |
1064 | srel = -srel; | |
1065 | if (srel & 1) | |
1066 | return bfd_reloc_outofrange; | |
1067 | srel = srel >> 1; | |
1068 | srel = (srel >> 16) & 0xff; | |
1069 | x = bfd_get_16 (input_bfd, contents); | |
1070 | x = (x & 0xf0f0) | (srel & 0xf) | ((srel << 4) & 0xf00); | |
1071 | bfd_put_16 (input_bfd, x, contents); | |
1072 | break; | |
1073 | ||
1074 | case R_AVR_CALL: | |
1075 | contents += rel->r_offset; | |
1076 | srel = (bfd_signed_vma) relocation + rel->r_addend; | |
1077 | if (srel & 1) | |
1078 | return bfd_reloc_outofrange; | |
1079 | srel = srel >> 1; | |
1080 | x = bfd_get_16 (input_bfd, contents); | |
1081 | x |= ((srel & 0x10000) | ((srel << 3) & 0x1f00000)) >> 16; | |
1082 | bfd_put_16 (input_bfd, x, contents); | |
dc810e39 | 1083 | bfd_put_16 (input_bfd, (bfd_vma) srel & 0xffff, contents+2); |
adde6300 AM |
1084 | break; |
1085 | ||
28c9d252 NC |
1086 | case R_AVR_16_PM: |
1087 | use_stubs = (!htab->no_stubs); | |
1088 | contents += rel->r_offset; | |
1089 | srel = (bfd_signed_vma) relocation + rel->r_addend; | |
1090 | ||
1091 | if (use_stubs | |
1092 | && avr_stub_is_required_for_16_bit_reloc (srel - base_addr)) | |
1093 | { | |
1094 | bfd_vma old_srel = srel; | |
1095 | ||
1096 | /* We need to use the address of the stub instead. */ | |
1097 | srel = avr_get_stub_addr (srel,htab); | |
1098 | if (debug_stubs) | |
1099 | printf ("LD: Using jump stub (at 0x%x) with destination 0x%x for " | |
1100 | "reloc at address 0x%x.\n", | |
1101 | (unsigned int) srel, | |
1102 | (unsigned int) old_srel, | |
1103 | (unsigned int) reloc_addr); | |
1104 | ||
1105 | if (avr_stub_is_required_for_16_bit_reloc (srel - base_addr)) | |
1106 | return bfd_reloc_outofrange; | |
1107 | } | |
1108 | ||
1109 | if (srel & 1) | |
1110 | return bfd_reloc_outofrange; | |
1111 | srel = srel >> 1; | |
1112 | bfd_put_16 (input_bfd, (bfd_vma) srel &0x00ffff, contents); | |
1113 | break; | |
1114 | ||
adde6300 AM |
1115 | default: |
1116 | r = _bfd_final_link_relocate (howto, input_bfd, input_section, | |
1117 | contents, rel->r_offset, | |
1118 | relocation, rel->r_addend); | |
1119 | } | |
1120 | ||
1121 | return r; | |
1122 | } | |
1123 | ||
1124 | /* Relocate an AVR ELF section. */ | |
4cdc7696 | 1125 | |
b34976b6 | 1126 | static bfd_boolean |
4cdc7696 NC |
1127 | elf32_avr_relocate_section (bfd *output_bfd ATTRIBUTE_UNUSED, |
1128 | struct bfd_link_info *info, | |
1129 | bfd *input_bfd, | |
1130 | asection *input_section, | |
1131 | bfd_byte *contents, | |
1132 | Elf_Internal_Rela *relocs, | |
1133 | Elf_Internal_Sym *local_syms, | |
1134 | asection **local_sections) | |
adde6300 AM |
1135 | { |
1136 | Elf_Internal_Shdr * symtab_hdr; | |
1137 | struct elf_link_hash_entry ** sym_hashes; | |
1138 | Elf_Internal_Rela * rel; | |
1139 | Elf_Internal_Rela * relend; | |
28c9d252 | 1140 | struct elf32_avr_link_hash_table * htab = avr_link_hash_table (info); |
adde6300 | 1141 | |
1049f94e | 1142 | if (info->relocatable) |
b34976b6 | 1143 | return TRUE; |
f0fe0e16 | 1144 | |
adde6300 AM |
1145 | symtab_hdr = & elf_tdata (input_bfd)->symtab_hdr; |
1146 | sym_hashes = elf_sym_hashes (input_bfd); | |
1147 | relend = relocs + input_section->reloc_count; | |
1148 | ||
1149 | for (rel = relocs; rel < relend; rel ++) | |
1150 | { | |
1151 | reloc_howto_type * howto; | |
1152 | unsigned long r_symndx; | |
1153 | Elf_Internal_Sym * sym; | |
1154 | asection * sec; | |
1155 | struct elf_link_hash_entry * h; | |
1156 | bfd_vma relocation; | |
1157 | bfd_reloc_status_type r; | |
dfeffb9f | 1158 | const char * name; |
adde6300 AM |
1159 | int r_type; |
1160 | ||
f0fe0e16 | 1161 | /* This is a final link. */ |
adde6300 AM |
1162 | r_type = ELF32_R_TYPE (rel->r_info); |
1163 | r_symndx = ELF32_R_SYM (rel->r_info); | |
adde6300 AM |
1164 | howto = elf_avr_howto_table + ELF32_R_TYPE (rel->r_info); |
1165 | h = NULL; | |
1166 | sym = NULL; | |
1167 | sec = NULL; | |
1168 | ||
1169 | if (r_symndx < symtab_hdr->sh_info) | |
1170 | { | |
1171 | sym = local_syms + r_symndx; | |
1172 | sec = local_sections [r_symndx]; | |
8517fae7 | 1173 | relocation = _bfd_elf_rela_local_sym (output_bfd, sym, &sec, rel); |
adde6300 AM |
1174 | |
1175 | name = bfd_elf_string_from_elf_section | |
1176 | (input_bfd, symtab_hdr->sh_link, sym->st_name); | |
1177 | name = (name == NULL) ? bfd_section_name (input_bfd, sec) : name; | |
1178 | } | |
1179 | else | |
1180 | { | |
59c2e50f | 1181 | bfd_boolean unresolved_reloc, warned; |
adde6300 | 1182 | |
b2a8e766 AM |
1183 | RELOC_FOR_GLOBAL_SYMBOL (info, input_bfd, input_section, rel, |
1184 | r_symndx, symtab_hdr, sym_hashes, | |
1185 | h, sec, relocation, | |
1186 | unresolved_reloc, warned); | |
dfeffb9f L |
1187 | |
1188 | name = h->root.root.string; | |
adde6300 AM |
1189 | } |
1190 | ||
1191 | r = avr_final_link_relocate (howto, input_bfd, input_section, | |
28c9d252 | 1192 | contents, rel, relocation, htab); |
adde6300 AM |
1193 | |
1194 | if (r != bfd_reloc_ok) | |
1195 | { | |
1196 | const char * msg = (const char *) NULL; | |
1197 | ||
1198 | switch (r) | |
1199 | { | |
1200 | case bfd_reloc_overflow: | |
1201 | r = info->callbacks->reloc_overflow | |
dfeffb9f L |
1202 | (info, (h ? &h->root : NULL), |
1203 | name, howto->name, (bfd_vma) 0, | |
adde6300 AM |
1204 | input_bfd, input_section, rel->r_offset); |
1205 | break; | |
1206 | ||
1207 | case bfd_reloc_undefined: | |
1208 | r = info->callbacks->undefined_symbol | |
b34976b6 | 1209 | (info, name, input_bfd, input_section, rel->r_offset, TRUE); |
adde6300 AM |
1210 | break; |
1211 | ||
1212 | case bfd_reloc_outofrange: | |
1213 | msg = _("internal error: out of range error"); | |
1214 | break; | |
1215 | ||
1216 | case bfd_reloc_notsupported: | |
1217 | msg = _("internal error: unsupported relocation error"); | |
1218 | break; | |
1219 | ||
1220 | case bfd_reloc_dangerous: | |
1221 | msg = _("internal error: dangerous relocation"); | |
1222 | break; | |
1223 | ||
1224 | default: | |
1225 | msg = _("internal error: unknown error"); | |
1226 | break; | |
1227 | } | |
1228 | ||
1229 | if (msg) | |
1230 | r = info->callbacks->warning | |
1231 | (info, msg, name, input_bfd, input_section, rel->r_offset); | |
1232 | ||
1233 | if (! r) | |
b34976b6 | 1234 | return FALSE; |
adde6300 AM |
1235 | } |
1236 | } | |
1237 | ||
b34976b6 | 1238 | return TRUE; |
adde6300 AM |
1239 | } |
1240 | ||
1241 | /* The final processing done just before writing out a AVR ELF object | |
1242 | file. This gets the AVR architecture right based on the machine | |
1243 | number. */ | |
1244 | ||
1245 | static void | |
4cdc7696 NC |
1246 | bfd_elf_avr_final_write_processing (bfd *abfd, |
1247 | bfd_boolean linker ATTRIBUTE_UNUSED) | |
adde6300 AM |
1248 | { |
1249 | unsigned long val; | |
1250 | ||
1251 | switch (bfd_get_mach (abfd)) | |
1252 | { | |
1253 | default: | |
1254 | case bfd_mach_avr2: | |
1255 | val = E_AVR_MACH_AVR2; | |
1256 | break; | |
1257 | ||
1258 | case bfd_mach_avr1: | |
1259 | val = E_AVR_MACH_AVR1; | |
1260 | break; | |
1261 | ||
1262 | case bfd_mach_avr3: | |
1263 | val = E_AVR_MACH_AVR3; | |
1264 | break; | |
1265 | ||
1266 | case bfd_mach_avr4: | |
1267 | val = E_AVR_MACH_AVR4; | |
1268 | break; | |
1269 | ||
65aa24b6 NC |
1270 | case bfd_mach_avr5: |
1271 | val = E_AVR_MACH_AVR5; | |
1272 | break; | |
28c9d252 NC |
1273 | |
1274 | case bfd_mach_avr6: | |
1275 | val = E_AVR_MACH_AVR6; | |
1276 | break; | |
adde6300 AM |
1277 | } |
1278 | ||
1279 | elf_elfheader (abfd)->e_machine = EM_AVR; | |
1280 | elf_elfheader (abfd)->e_flags &= ~ EF_AVR_MACH; | |
1281 | elf_elfheader (abfd)->e_flags |= val; | |
df406460 | 1282 | elf_elfheader (abfd)->e_flags |= EF_AVR_LINKRELAX_PREPARED; |
adde6300 AM |
1283 | } |
1284 | ||
1285 | /* Set the right machine number. */ | |
1286 | ||
b34976b6 | 1287 | static bfd_boolean |
4cdc7696 | 1288 | elf32_avr_object_p (bfd *abfd) |
adde6300 | 1289 | { |
dc810e39 | 1290 | unsigned int e_set = bfd_mach_avr2; |
4cdc7696 | 1291 | |
aa4f99bb AO |
1292 | if (elf_elfheader (abfd)->e_machine == EM_AVR |
1293 | || elf_elfheader (abfd)->e_machine == EM_AVR_OLD) | |
adde6300 AM |
1294 | { |
1295 | int e_mach = elf_elfheader (abfd)->e_flags & EF_AVR_MACH; | |
4cdc7696 | 1296 | |
adde6300 AM |
1297 | switch (e_mach) |
1298 | { | |
1299 | default: | |
1300 | case E_AVR_MACH_AVR2: | |
1301 | e_set = bfd_mach_avr2; | |
1302 | break; | |
1303 | ||
1304 | case E_AVR_MACH_AVR1: | |
1305 | e_set = bfd_mach_avr1; | |
1306 | break; | |
1307 | ||
1308 | case E_AVR_MACH_AVR3: | |
1309 | e_set = bfd_mach_avr3; | |
1310 | break; | |
1311 | ||
1312 | case E_AVR_MACH_AVR4: | |
1313 | e_set = bfd_mach_avr4; | |
1314 | break; | |
65aa24b6 NC |
1315 | |
1316 | case E_AVR_MACH_AVR5: | |
1317 | e_set = bfd_mach_avr5; | |
1318 | break; | |
28c9d252 NC |
1319 | |
1320 | case E_AVR_MACH_AVR6: | |
1321 | e_set = bfd_mach_avr6; | |
1322 | break; | |
adde6300 AM |
1323 | } |
1324 | } | |
1325 | return bfd_default_set_arch_mach (abfd, bfd_arch_avr, | |
1326 | e_set); | |
1327 | } | |
1328 | ||
df406460 | 1329 | |
4cdc7696 NC |
1330 | /* Delete some bytes from a section while changing the size of an instruction. |
1331 | The parameter "addr" denotes the section-relative offset pointing just | |
1332 | behind the shrinked instruction. "addr+count" point at the first | |
1333 | byte just behind the original unshrinked instruction. */ | |
1334 | ||
1335 | static bfd_boolean | |
1336 | elf32_avr_relax_delete_bytes (bfd *abfd, | |
73160847 | 1337 | asection *sec, |
4cdc7696 | 1338 | bfd_vma addr, |
73160847 | 1339 | int count) |
4cdc7696 NC |
1340 | { |
1341 | Elf_Internal_Shdr *symtab_hdr; | |
1342 | unsigned int sec_shndx; | |
1343 | bfd_byte *contents; | |
1344 | Elf_Internal_Rela *irel, *irelend; | |
1345 | Elf_Internal_Rela *irelalign; | |
1346 | Elf_Internal_Sym *isym; | |
1347 | Elf_Internal_Sym *isymbuf = NULL; | |
1348 | Elf_Internal_Sym *isymend; | |
1349 | bfd_vma toaddr; | |
1350 | struct elf_link_hash_entry **sym_hashes; | |
1351 | struct elf_link_hash_entry **end_hashes; | |
1352 | unsigned int symcount; | |
1353 | ||
1354 | symtab_hdr = &elf_tdata (abfd)->symtab_hdr; | |
1355 | sec_shndx = _bfd_elf_section_from_bfd_section (abfd, sec); | |
1356 | contents = elf_section_data (sec)->this_hdr.contents; | |
1357 | ||
1358 | /* The deletion must stop at the next ALIGN reloc for an aligment | |
1359 | power larger than the number of bytes we are deleting. */ | |
1360 | ||
1361 | irelalign = NULL; | |
1362 | toaddr = sec->size; | |
1363 | ||
1364 | irel = elf_section_data (sec)->relocs; | |
1365 | irelend = irel + sec->reloc_count; | |
1366 | ||
1367 | /* Actually delete the bytes. */ | |
1368 | if (toaddr - addr - count > 0) | |
1369 | memmove (contents + addr, contents + addr + count, | |
1370 | (size_t) (toaddr - addr - count)); | |
1371 | sec->size -= count; | |
1372 | ||
73160847 | 1373 | /* Adjust all the reloc addresses. */ |
4cdc7696 NC |
1374 | for (irel = elf_section_data (sec)->relocs; irel < irelend; irel++) |
1375 | { | |
4cdc7696 NC |
1376 | bfd_vma old_reloc_address; |
1377 | bfd_vma shrinked_insn_address; | |
1378 | ||
1379 | old_reloc_address = (sec->output_section->vma | |
1380 | + sec->output_offset + irel->r_offset); | |
1381 | shrinked_insn_address = (sec->output_section->vma | |
1382 | + sec->output_offset + addr - count); | |
1383 | ||
1384 | /* Get the new reloc address. */ | |
1385 | if ((irel->r_offset > addr | |
1386 | && irel->r_offset < toaddr)) | |
1387 | { | |
28c9d252 | 1388 | if (debug_relax) |
4cdc7696 NC |
1389 | printf ("Relocation at address 0x%x needs to be moved.\n" |
1390 | "Old section offset: 0x%x, New section offset: 0x%x \n", | |
1391 | (unsigned int) old_reloc_address, | |
1392 | (unsigned int) irel->r_offset, | |
1393 | (unsigned int) ((irel->r_offset) - count)); | |
1394 | ||
1395 | irel->r_offset -= count; | |
1396 | } | |
1397 | ||
73160847 | 1398 | } |
4cdc7696 | 1399 | |
73160847 NC |
1400 | /* The reloc's own addresses are now ok. However, we need to readjust |
1401 | the reloc's addend, i.e. the reloc's value if two conditions are met: | |
1402 | 1.) the reloc is relative to a symbol in this section that | |
1403 | is located in front of the shrinked instruction | |
28c9d252 NC |
1404 | 2.) symbol plus addend end up behind the shrinked instruction. |
1405 | ||
73160847 NC |
1406 | The most common case where this happens are relocs relative to |
1407 | the section-start symbol. | |
28c9d252 | 1408 | |
73160847 NC |
1409 | This step needs to be done for all of the sections of the bfd. */ |
1410 | ||
1411 | { | |
1412 | struct bfd_section *isec; | |
1413 | ||
1414 | for (isec = abfd->sections; isec; isec = isec->next) | |
1415 | { | |
1416 | bfd_vma symval; | |
1417 | bfd_vma shrinked_insn_address; | |
1418 | ||
1419 | shrinked_insn_address = (sec->output_section->vma | |
1420 | + sec->output_offset + addr - count); | |
1421 | ||
1422 | irelend = elf_section_data (isec)->relocs + isec->reloc_count; | |
28c9d252 | 1423 | for (irel = elf_section_data (isec)->relocs; |
73160847 NC |
1424 | irel < irelend; |
1425 | irel++) | |
1426 | { | |
28c9d252 | 1427 | /* Read this BFD's local symbols if we haven't done |
73160847 NC |
1428 | so already. */ |
1429 | if (isymbuf == NULL && symtab_hdr->sh_info != 0) | |
1430 | { | |
1431 | isymbuf = (Elf_Internal_Sym *) symtab_hdr->contents; | |
1432 | if (isymbuf == NULL) | |
1433 | isymbuf = bfd_elf_get_elf_syms (abfd, symtab_hdr, | |
1434 | symtab_hdr->sh_info, 0, | |
1435 | NULL, NULL, NULL); | |
1436 | if (isymbuf == NULL) | |
1437 | return FALSE; | |
1438 | } | |
1439 | ||
1440 | /* Get the value of the symbol referred to by the reloc. */ | |
1441 | if (ELF32_R_SYM (irel->r_info) < symtab_hdr->sh_info) | |
1442 | { | |
1443 | /* A local symbol. */ | |
1444 | Elf_Internal_Sym *isym; | |
1445 | asection *sym_sec; | |
1446 | ||
1447 | isym = isymbuf + ELF32_R_SYM (irel->r_info); | |
1448 | sym_sec = bfd_section_from_elf_index (abfd, isym->st_shndx); | |
1449 | symval = isym->st_value; | |
1450 | /* If the reloc is absolute, it will not have | |
1451 | a symbol or section associated with it. */ | |
1452 | if (sym_sec == sec) | |
28c9d252 | 1453 | { |
73160847 NC |
1454 | symval += sym_sec->output_section->vma |
1455 | + sym_sec->output_offset; | |
4cdc7696 | 1456 | |
28c9d252 | 1457 | if (debug_relax) |
73160847 NC |
1458 | printf ("Checking if the relocation's " |
1459 | "addend needs corrections.\n" | |
1460 | "Address of anchor symbol: 0x%x \n" | |
1461 | "Address of relocation target: 0x%x \n" | |
1462 | "Address of relaxed insn: 0x%x \n", | |
1463 | (unsigned int) symval, | |
1464 | (unsigned int) (symval + irel->r_addend), | |
1465 | (unsigned int) shrinked_insn_address); | |
1466 | ||
1467 | if (symval <= shrinked_insn_address | |
1468 | && (symval + irel->r_addend) > shrinked_insn_address) | |
1469 | { | |
1470 | irel->r_addend -= count; | |
1471 | ||
28c9d252 | 1472 | if (debug_relax) |
73160847 NC |
1473 | printf ("Relocation's addend needed to be fixed \n"); |
1474 | } | |
4cdc7696 | 1475 | } |
73160847 | 1476 | /* else...Reference symbol is absolute. No adjustment needed. */ |
28c9d252 NC |
1477 | } |
1478 | /* else...Reference symbol is extern. No need for adjusting | |
73160847 | 1479 | the addend. */ |
28c9d252 | 1480 | } |
73160847 NC |
1481 | } |
1482 | } | |
4cdc7696 NC |
1483 | |
1484 | /* Adjust the local symbols defined in this section. */ | |
1485 | isym = (Elf_Internal_Sym *) symtab_hdr->contents; | |
1486 | isymend = isym + symtab_hdr->sh_info; | |
1487 | for (; isym < isymend; isym++) | |
1488 | { | |
1489 | if (isym->st_shndx == sec_shndx | |
1490 | && isym->st_value > addr | |
1491 | && isym->st_value < toaddr) | |
1492 | isym->st_value -= count; | |
1493 | } | |
1494 | ||
1495 | /* Now adjust the global symbols defined in this section. */ | |
1496 | symcount = (symtab_hdr->sh_size / sizeof (Elf32_External_Sym) | |
1497 | - symtab_hdr->sh_info); | |
1498 | sym_hashes = elf_sym_hashes (abfd); | |
1499 | end_hashes = sym_hashes + symcount; | |
1500 | for (; sym_hashes < end_hashes; sym_hashes++) | |
1501 | { | |
1502 | struct elf_link_hash_entry *sym_hash = *sym_hashes; | |
1503 | if ((sym_hash->root.type == bfd_link_hash_defined | |
1504 | || sym_hash->root.type == bfd_link_hash_defweak) | |
1505 | && sym_hash->root.u.def.section == sec | |
1506 | && sym_hash->root.u.def.value > addr | |
1507 | && sym_hash->root.u.def.value < toaddr) | |
1508 | { | |
1509 | sym_hash->root.u.def.value -= count; | |
1510 | } | |
1511 | } | |
1512 | ||
1513 | return TRUE; | |
1514 | } | |
1515 | ||
df406460 NC |
1516 | /* This function handles relaxing for the avr. |
1517 | Many important relaxing opportunities within functions are already | |
1518 | realized by the compiler itself. | |
1519 | Here we try to replace call (4 bytes) -> rcall (2 bytes) | |
4cdc7696 NC |
1520 | and jump -> rjmp (safes also 2 bytes). |
1521 | As well we now optimize seqences of | |
df406460 NC |
1522 | - call/rcall function |
1523 | - ret | |
1524 | to yield | |
1525 | - jmp/rjmp function | |
1526 | - ret | |
1527 | . In case that within a sequence | |
1528 | - jmp/rjmp label | |
1529 | - ret | |
1530 | the ret could no longer be reached it is optimized away. In order | |
1531 | to check if the ret is no longer needed, it is checked that the ret's address | |
1532 | is not the target of a branch or jump within the same section, it is checked | |
1533 | that there is no skip instruction before the jmp/rjmp and that there | |
1534 | is no local or global label place at the address of the ret. | |
4cdc7696 | 1535 | |
df406460 | 1536 | We refrain from relaxing within sections ".vectors" and |
4cdc7696 | 1537 | ".jumptables" in order to maintain the position of the instructions. |
df406460 | 1538 | There, however, we substitute jmp/call by a sequence rjmp,nop/rcall,nop |
4cdc7696 | 1539 | if possible. (In future one could possibly use the space of the nop |
df406460 NC |
1540 | for the first instruction of the irq service function. |
1541 | ||
1542 | The .jumptables sections is meant to be used for a future tablejump variant | |
1543 | for the devices with 3-byte program counter where the table itself | |
4cdc7696 | 1544 | contains 4-byte jump instructions whose relative offset must not |
df406460 | 1545 | be changed. */ |
4cdc7696 | 1546 | |
28c9d252 | 1547 | static bfd_boolean |
4cdc7696 NC |
1548 | elf32_avr_relax_section (bfd *abfd, |
1549 | asection *sec, | |
df406460 NC |
1550 | struct bfd_link_info *link_info, |
1551 | bfd_boolean *again) | |
1552 | { | |
1553 | Elf_Internal_Shdr *symtab_hdr; | |
1554 | Elf_Internal_Rela *internal_relocs; | |
1555 | Elf_Internal_Rela *irel, *irelend; | |
1556 | bfd_byte *contents = NULL; | |
1557 | Elf_Internal_Sym *isymbuf = NULL; | |
1558 | static asection *last_input_section = NULL; | |
1559 | static Elf_Internal_Rela *last_reloc = NULL; | |
28c9d252 NC |
1560 | struct elf32_avr_link_hash_table *htab; |
1561 | ||
1562 | htab = avr_link_hash_table (link_info); | |
df406460 NC |
1563 | |
1564 | /* Assume nothing changes. */ | |
1565 | *again = FALSE; | |
1566 | ||
28c9d252 NC |
1567 | if ((!htab->no_stubs) && (sec == htab->stub_sec)) |
1568 | { | |
1569 | /* We are just relaxing the stub section. | |
1570 | Let's calculate the size needed again. */ | |
1571 | bfd_size_type last_estimated_stub_section_size = htab->stub_sec->size; | |
1572 | ||
1573 | if (debug_relax) | |
1574 | printf ("Relaxing the stub section. Size prior to this pass: %i\n", | |
1575 | (int) last_estimated_stub_section_size); | |
1576 | ||
1577 | elf32_avr_size_stubs (htab->stub_sec->output_section->owner, | |
1578 | link_info, FALSE); | |
1579 | ||
1580 | /* Check if the number of trampolines changed. */ | |
1581 | if (last_estimated_stub_section_size != htab->stub_sec->size) | |
1582 | *again = TRUE; | |
1583 | ||
1584 | if (debug_relax) | |
1585 | printf ("Size of stub section after this pass: %i\n", | |
1586 | (int) htab->stub_sec->size); | |
1587 | ||
1588 | return TRUE; | |
1589 | } | |
1590 | ||
df406460 NC |
1591 | /* We don't have to do anything for a relocatable link, if |
1592 | this section does not have relocs, or if this is not a | |
1593 | code section. */ | |
1594 | if (link_info->relocatable | |
1595 | || (sec->flags & SEC_RELOC) == 0 | |
1596 | || sec->reloc_count == 0 | |
1597 | || (sec->flags & SEC_CODE) == 0) | |
1598 | return TRUE; | |
4cdc7696 | 1599 | |
df406460 NC |
1600 | /* Check if the object file to relax uses internal symbols so that we |
1601 | could fix up the relocations. */ | |
df406460 NC |
1602 | if (!(elf_elfheader (abfd)->e_flags & EF_AVR_LINKRELAX_PREPARED)) |
1603 | return TRUE; | |
df406460 NC |
1604 | |
1605 | symtab_hdr = &elf_tdata (abfd)->symtab_hdr; | |
1606 | ||
1607 | /* Get a copy of the native relocations. */ | |
1608 | internal_relocs = (_bfd_elf_link_read_relocs | |
4cdc7696 | 1609 | (abfd, sec, NULL, NULL, link_info->keep_memory)); |
df406460 NC |
1610 | if (internal_relocs == NULL) |
1611 | goto error_return; | |
1612 | ||
1613 | if (sec != last_input_section) | |
1614 | last_reloc = NULL; | |
1615 | ||
1616 | last_input_section = sec; | |
1617 | ||
1618 | /* Walk through the relocs looking for relaxing opportunities. */ | |
1619 | irelend = internal_relocs + sec->reloc_count; | |
1620 | for (irel = internal_relocs; irel < irelend; irel++) | |
1621 | { | |
1622 | bfd_vma symval; | |
1623 | ||
4cdc7696 | 1624 | if ( ELF32_R_TYPE (irel->r_info) != R_AVR_13_PCREL |
df406460 NC |
1625 | && ELF32_R_TYPE (irel->r_info) != R_AVR_7_PCREL |
1626 | && ELF32_R_TYPE (irel->r_info) != R_AVR_CALL) | |
1627 | continue; | |
4cdc7696 | 1628 | |
df406460 NC |
1629 | /* Get the section contents if we haven't done so already. */ |
1630 | if (contents == NULL) | |
1631 | { | |
1632 | /* Get cached copy if it exists. */ | |
1633 | if (elf_section_data (sec)->this_hdr.contents != NULL) | |
1634 | contents = elf_section_data (sec)->this_hdr.contents; | |
1635 | else | |
1636 | { | |
1637 | /* Go get them off disk. */ | |
4cdc7696 | 1638 | if (! bfd_malloc_and_get_section (abfd, sec, &contents)) |
df406460 NC |
1639 | goto error_return; |
1640 | } | |
1641 | } | |
1642 | ||
1643 | /* Read this BFD's local symbols if we haven't done so already. */ | |
1644 | if (isymbuf == NULL && symtab_hdr->sh_info != 0) | |
1645 | { | |
1646 | isymbuf = (Elf_Internal_Sym *) symtab_hdr->contents; | |
1647 | if (isymbuf == NULL) | |
1648 | isymbuf = bfd_elf_get_elf_syms (abfd, symtab_hdr, | |
1649 | symtab_hdr->sh_info, 0, | |
1650 | NULL, NULL, NULL); | |
1651 | if (isymbuf == NULL) | |
1652 | goto error_return; | |
1653 | } | |
1654 | ||
1655 | ||
1656 | /* Get the value of the symbol referred to by the reloc. */ | |
1657 | if (ELF32_R_SYM (irel->r_info) < symtab_hdr->sh_info) | |
1658 | { | |
1659 | /* A local symbol. */ | |
1660 | Elf_Internal_Sym *isym; | |
1661 | asection *sym_sec; | |
1662 | ||
1663 | isym = isymbuf + ELF32_R_SYM (irel->r_info); | |
1664 | sym_sec = bfd_section_from_elf_index (abfd, isym->st_shndx); | |
1665 | symval = isym->st_value; | |
1666 | /* If the reloc is absolute, it will not have | |
1667 | a symbol or section associated with it. */ | |
1668 | if (sym_sec) | |
1669 | symval += sym_sec->output_section->vma | |
1670 | + sym_sec->output_offset; | |
1671 | } | |
1672 | else | |
1673 | { | |
1674 | unsigned long indx; | |
1675 | struct elf_link_hash_entry *h; | |
1676 | ||
1677 | /* An external symbol. */ | |
1678 | indx = ELF32_R_SYM (irel->r_info) - symtab_hdr->sh_info; | |
1679 | h = elf_sym_hashes (abfd)[indx]; | |
1680 | BFD_ASSERT (h != NULL); | |
1681 | if (h->root.type != bfd_link_hash_defined | |
1682 | && h->root.type != bfd_link_hash_defweak) | |
4cdc7696 NC |
1683 | /* This appears to be a reference to an undefined |
1684 | symbol. Just ignore it--it will be caught by the | |
1685 | regular reloc processing. */ | |
1686 | continue; | |
1687 | ||
df406460 NC |
1688 | symval = (h->root.u.def.value |
1689 | + h->root.u.def.section->output_section->vma | |
1690 | + h->root.u.def.section->output_offset); | |
1691 | } | |
1692 | ||
1693 | /* For simplicity of coding, we are going to modify the section | |
1694 | contents, the section relocs, and the BFD symbol table. We | |
1695 | must tell the rest of the code not to free up this | |
1696 | information. It would be possible to instead create a table | |
1697 | of changes which have to be made, as is done in coff-mips.c; | |
1698 | that would be more work, but would require less memory when | |
1699 | the linker is run. */ | |
1700 | switch (ELF32_R_TYPE (irel->r_info)) | |
1701 | { | |
1702 | /* Try to turn a 22-bit absolute call/jump into an 13-bit | |
1703 | pc-relative rcall/rjmp. */ | |
1704 | case R_AVR_CALL: | |
1705 | { | |
1706 | bfd_vma value = symval + irel->r_addend; | |
1707 | bfd_vma dot, gap; | |
1708 | int distance_short_enough = 0; | |
1709 | ||
1710 | /* Get the address of this instruction. */ | |
1711 | dot = (sec->output_section->vma | |
1712 | + sec->output_offset + irel->r_offset); | |
1713 | ||
1714 | /* Compute the distance from this insn to the branch target. */ | |
1715 | gap = value - dot; | |
1716 | ||
1717 | /* If the distance is within -4094..+4098 inclusive, then we can | |
1718 | relax this jump/call. +4098 because the call/jump target | |
4cdc7696 | 1719 | will be closer after the relaxation. */ |
df406460 NC |
1720 | if ((int) gap >= -4094 && (int) gap <= 4098) |
1721 | distance_short_enough = 1; | |
1722 | ||
1723 | /* Here we handle the wrap-around case. E.g. for a 16k device | |
4cdc7696 | 1724 | we could use a rjmp to jump from address 0x100 to 0x3d00! |
df406460 NC |
1725 | In order to make this work properly, we need to fill the |
1726 | vaiable avr_pc_wrap_around with the appropriate value. | |
1727 | I.e. 0x4000 for a 16k device. */ | |
1728 | { | |
1729 | /* Shrinking the code size makes the gaps larger in the | |
1730 | case of wrap-arounds. So we use a heuristical safety | |
1731 | margin to avoid that during relax the distance gets | |
1732 | again too large for the short jumps. Let's assume | |
1733 | a typical code-size reduction due to relax for a | |
1734 | 16k device of 600 bytes. So let's use twice the | |
4cdc7696 | 1735 | typical value as safety margin. */ |
df406460 NC |
1736 | int rgap; |
1737 | int safety_margin; | |
1738 | ||
1739 | int assumed_shrink = 600; | |
1740 | if (avr_pc_wrap_around > 0x4000) | |
1741 | assumed_shrink = 900; | |
4cdc7696 | 1742 | |
df406460 NC |
1743 | safety_margin = 2 * assumed_shrink; |
1744 | ||
1745 | rgap = avr_relative_distance_considering_wrap_around (gap); | |
4cdc7696 NC |
1746 | |
1747 | if (rgap >= (-4092 + safety_margin) | |
df406460 | 1748 | && rgap <= (4094 - safety_margin)) |
4cdc7696 NC |
1749 | distance_short_enough = 1; |
1750 | } | |
df406460 NC |
1751 | |
1752 | if (distance_short_enough) | |
1753 | { | |
1754 | unsigned char code_msb; | |
1755 | unsigned char code_lsb; | |
1756 | ||
28c9d252 | 1757 | if (debug_relax) |
df406460 NC |
1758 | printf ("shrinking jump/call instruction at address 0x%x" |
1759 | " in section %s\n\n", | |
1760 | (int) dot, sec->name); | |
1761 | ||
1762 | /* Note that we've changed the relocs, section contents, | |
1763 | etc. */ | |
1764 | elf_section_data (sec)->relocs = internal_relocs; | |
1765 | elf_section_data (sec)->this_hdr.contents = contents; | |
1766 | symtab_hdr->contents = (unsigned char *) isymbuf; | |
1767 | ||
1768 | /* Get the instruction code for relaxing. */ | |
1769 | code_lsb = bfd_get_8 (abfd, contents + irel->r_offset); | |
1770 | code_msb = bfd_get_8 (abfd, contents + irel->r_offset + 1); | |
1771 | ||
1772 | /* Mask out the relocation bits. */ | |
1773 | code_msb &= 0x94; | |
1774 | code_lsb &= 0x0E; | |
1775 | if (code_msb == 0x94 && code_lsb == 0x0E) | |
1776 | { | |
1777 | /* we are changing call -> rcall . */ | |
1778 | bfd_put_8 (abfd, 0x00, contents + irel->r_offset); | |
1779 | bfd_put_8 (abfd, 0xD0, contents + irel->r_offset + 1); | |
1780 | } | |
1781 | else if (code_msb == 0x94 && code_lsb == 0x0C) | |
1782 | { | |
1783 | /* we are changeing jump -> rjmp. */ | |
1784 | bfd_put_8 (abfd, 0x00, contents + irel->r_offset); | |
1785 | bfd_put_8 (abfd, 0xC0, contents + irel->r_offset + 1); | |
1786 | } | |
4cdc7696 | 1787 | else |
df406460 NC |
1788 | abort (); |
1789 | ||
1790 | /* Fix the relocation's type. */ | |
1791 | irel->r_info = ELF32_R_INFO (ELF32_R_SYM (irel->r_info), | |
1792 | R_AVR_13_PCREL); | |
1793 | ||
1794 | /* Check for the vector section. There we don't want to | |
1795 | modify the ordering! */ | |
1796 | ||
1797 | if (!strcmp (sec->name,".vectors") | |
1798 | || !strcmp (sec->name,".jumptables")) | |
1799 | { | |
1800 | /* Let's insert a nop. */ | |
1801 | bfd_put_8 (abfd, 0x00, contents + irel->r_offset + 2); | |
1802 | bfd_put_8 (abfd, 0x00, contents + irel->r_offset + 3); | |
1803 | } | |
1804 | else | |
1805 | { | |
1806 | /* Delete two bytes of data. */ | |
1807 | if (!elf32_avr_relax_delete_bytes (abfd, sec, | |
1808 | irel->r_offset + 2, 2)) | |
1809 | goto error_return; | |
1810 | ||
1811 | /* That will change things, so, we should relax again. | |
1812 | Note that this is not required, and it may be slow. */ | |
1813 | *again = TRUE; | |
1814 | } | |
1815 | } | |
1816 | } | |
4cdc7696 | 1817 | |
df406460 NC |
1818 | default: |
1819 | { | |
1820 | unsigned char code_msb; | |
1821 | unsigned char code_lsb; | |
1822 | bfd_vma dot; | |
1823 | ||
1824 | code_msb = bfd_get_8 (abfd, contents + irel->r_offset + 1); | |
1825 | code_lsb = bfd_get_8 (abfd, contents + irel->r_offset + 0); | |
1826 | ||
1827 | /* Get the address of this instruction. */ | |
1828 | dot = (sec->output_section->vma | |
1829 | + sec->output_offset + irel->r_offset); | |
4cdc7696 NC |
1830 | |
1831 | /* Here we look for rcall/ret or call/ret sequences that could be | |
28c9d252 NC |
1832 | safely replaced by rjmp/ret or jmp/ret. */ |
1833 | if (((code_msb & 0xf0) == 0xd0) | |
1834 | && avr_replace_call_ret_sequences) | |
df406460 NC |
1835 | { |
1836 | /* This insn is a rcall. */ | |
1837 | unsigned char next_insn_msb = 0; | |
1838 | unsigned char next_insn_lsb = 0; | |
1839 | ||
1840 | if (irel->r_offset + 3 < sec->size) | |
1841 | { | |
4cdc7696 | 1842 | next_insn_msb = |
df406460 | 1843 | bfd_get_8 (abfd, contents + irel->r_offset + 3); |
4cdc7696 | 1844 | next_insn_lsb = |
df406460 NC |
1845 | bfd_get_8 (abfd, contents + irel->r_offset + 2); |
1846 | } | |
4cdc7696 NC |
1847 | |
1848 | if ((0x95 == next_insn_msb) && (0x08 == next_insn_lsb)) | |
df406460 NC |
1849 | { |
1850 | /* The next insn is a ret. We now convert the rcall insn | |
1851 | into a rjmp instruction. */ | |
df406460 NC |
1852 | code_msb &= 0xef; |
1853 | bfd_put_8 (abfd, code_msb, contents + irel->r_offset + 1); | |
28c9d252 | 1854 | if (debug_relax) |
df406460 NC |
1855 | printf ("converted rcall/ret sequence at address 0x%x" |
1856 | " into rjmp/ret sequence. Section is %s\n\n", | |
1857 | (int) dot, sec->name); | |
1858 | *again = TRUE; | |
1859 | break; | |
1860 | } | |
1861 | } | |
1862 | else if ((0x94 == (code_msb & 0xfe)) | |
28c9d252 NC |
1863 | && (0x0e == (code_lsb & 0x0e)) |
1864 | && avr_replace_call_ret_sequences) | |
df406460 NC |
1865 | { |
1866 | /* This insn is a call. */ | |
1867 | unsigned char next_insn_msb = 0; | |
1868 | unsigned char next_insn_lsb = 0; | |
1869 | ||
1870 | if (irel->r_offset + 5 < sec->size) | |
1871 | { | |
1872 | next_insn_msb = | |
1873 | bfd_get_8 (abfd, contents + irel->r_offset + 5); | |
1874 | next_insn_lsb = | |
1875 | bfd_get_8 (abfd, contents + irel->r_offset + 4); | |
1876 | } | |
4cdc7696 | 1877 | |
df406460 NC |
1878 | if ((0x95 == next_insn_msb) && (0x08 == next_insn_lsb)) |
1879 | { | |
1880 | /* The next insn is a ret. We now convert the call insn | |
1881 | into a jmp instruction. */ | |
1882 | ||
1883 | code_lsb &= 0xfd; | |
1884 | bfd_put_8 (abfd, code_lsb, contents + irel->r_offset); | |
28c9d252 | 1885 | if (debug_relax) |
df406460 NC |
1886 | printf ("converted call/ret sequence at address 0x%x" |
1887 | " into jmp/ret sequence. Section is %s\n\n", | |
1888 | (int) dot, sec->name); | |
1889 | *again = TRUE; | |
1890 | break; | |
1891 | } | |
1892 | } | |
4cdc7696 NC |
1893 | else if ((0xc0 == (code_msb & 0xf0)) |
1894 | || ((0x94 == (code_msb & 0xfe)) | |
df406460 NC |
1895 | && (0x0c == (code_lsb & 0x0e)))) |
1896 | { | |
4cdc7696 | 1897 | /* This insn is a rjmp or a jmp. */ |
df406460 NC |
1898 | unsigned char next_insn_msb = 0; |
1899 | unsigned char next_insn_lsb = 0; | |
1900 | int insn_size; | |
1901 | ||
1902 | if (0xc0 == (code_msb & 0xf0)) | |
1903 | insn_size = 2; /* rjmp insn */ | |
1904 | else | |
1905 | insn_size = 4; /* jmp insn */ | |
1906 | ||
1907 | if (irel->r_offset + insn_size + 1 < sec->size) | |
1908 | { | |
4cdc7696 NC |
1909 | next_insn_msb = |
1910 | bfd_get_8 (abfd, contents + irel->r_offset | |
df406460 | 1911 | + insn_size + 1); |
4cdc7696 NC |
1912 | next_insn_lsb = |
1913 | bfd_get_8 (abfd, contents + irel->r_offset | |
df406460 NC |
1914 | + insn_size); |
1915 | } | |
1916 | ||
1917 | if ((0x95 == next_insn_msb) && (0x08 == next_insn_lsb)) | |
1918 | { | |
1919 | /* The next insn is a ret. We possibly could delete | |
1920 | this ret. First we need to check for preceeding | |
1921 | sbis/sbic/sbrs or cpse "skip" instructions. */ | |
1922 | ||
1923 | int there_is_preceeding_non_skip_insn = 1; | |
1924 | bfd_vma address_of_ret; | |
1925 | ||
1926 | address_of_ret = dot + insn_size; | |
1927 | ||
28c9d252 | 1928 | if (debug_relax && (insn_size == 2)) |
4cdc7696 | 1929 | printf ("found rjmp / ret sequence at address 0x%x\n", |
df406460 | 1930 | (int) dot); |
28c9d252 | 1931 | if (debug_relax && (insn_size == 4)) |
4cdc7696 | 1932 | printf ("found jmp / ret sequence at address 0x%x\n", |
df406460 NC |
1933 | (int) dot); |
1934 | ||
1935 | /* We have to make sure that there is a preceeding insn. */ | |
1936 | if (irel->r_offset >= 2) | |
1937 | { | |
1938 | unsigned char preceeding_msb; | |
1939 | unsigned char preceeding_lsb; | |
4cdc7696 | 1940 | preceeding_msb = |
df406460 | 1941 | bfd_get_8 (abfd, contents + irel->r_offset - 1); |
4cdc7696 | 1942 | preceeding_lsb = |
df406460 NC |
1943 | bfd_get_8 (abfd, contents + irel->r_offset - 2); |
1944 | ||
1945 | /* sbic. */ | |
4cdc7696 | 1946 | if (0x99 == preceeding_msb) |
df406460 NC |
1947 | there_is_preceeding_non_skip_insn = 0; |
1948 | ||
1949 | /* sbis. */ | |
4cdc7696 | 1950 | if (0x9b == preceeding_msb) |
df406460 NC |
1951 | there_is_preceeding_non_skip_insn = 0; |
1952 | ||
1953 | /* sbrc */ | |
1954 | if ((0xfc == (preceeding_msb & 0xfe) | |
1955 | && (0x00 == (preceeding_lsb & 0x08)))) | |
1956 | there_is_preceeding_non_skip_insn = 0; | |
1957 | ||
4cdc7696 | 1958 | /* sbrs */ |
df406460 NC |
1959 | if ((0xfe == (preceeding_msb & 0xfe) |
1960 | && (0x00 == (preceeding_lsb & 0x08)))) | |
1961 | there_is_preceeding_non_skip_insn = 0; | |
4cdc7696 | 1962 | |
df406460 NC |
1963 | /* cpse */ |
1964 | if (0x10 == (preceeding_msb & 0xfc)) | |
1965 | there_is_preceeding_non_skip_insn = 0; | |
4cdc7696 | 1966 | |
df406460 | 1967 | if (there_is_preceeding_non_skip_insn == 0) |
28c9d252 | 1968 | if (debug_relax) |
df406460 NC |
1969 | printf ("preceeding skip insn prevents deletion of" |
1970 | " ret insn at addr 0x%x in section %s\n", | |
1971 | (int) dot + 2, sec->name); | |
1972 | } | |
1973 | else | |
1974 | { | |
1975 | /* There is no previous instruction. */ | |
1976 | there_is_preceeding_non_skip_insn = 0; | |
4cdc7696 | 1977 | } |
df406460 NC |
1978 | |
1979 | if (there_is_preceeding_non_skip_insn) | |
1980 | { | |
1981 | /* We now only have to make sure that there is no | |
1982 | local label defined at the address of the ret | |
1983 | instruction and that there is no local relocation | |
1984 | in this section pointing to the ret. */ | |
1985 | ||
1986 | int deleting_ret_is_safe = 1; | |
4cdc7696 | 1987 | unsigned int section_offset_of_ret_insn = |
df406460 NC |
1988 | irel->r_offset + insn_size; |
1989 | Elf_Internal_Sym *isym, *isymend; | |
1990 | unsigned int sec_shndx; | |
4cdc7696 NC |
1991 | |
1992 | sec_shndx = | |
1993 | _bfd_elf_section_from_bfd_section (abfd, sec); | |
df406460 NC |
1994 | |
1995 | /* Check for local symbols. */ | |
1996 | isym = (Elf_Internal_Sym *) symtab_hdr->contents; | |
1997 | isymend = isym + symtab_hdr->sh_info; | |
1998 | for (; isym < isymend; isym++) | |
1999 | { | |
2000 | if (isym->st_value == section_offset_of_ret_insn | |
2001 | && isym->st_shndx == sec_shndx) | |
2002 | { | |
2003 | deleting_ret_is_safe = 0; | |
28c9d252 | 2004 | if (debug_relax) |
df406460 NC |
2005 | printf ("local label prevents deletion of ret " |
2006 | "insn at address 0x%x\n", | |
2007 | (int) dot + insn_size); | |
2008 | } | |
2009 | } | |
2010 | ||
2011 | /* Now check for global symbols. */ | |
2012 | { | |
2013 | int symcount; | |
2014 | struct elf_link_hash_entry **sym_hashes; | |
2015 | struct elf_link_hash_entry **end_hashes; | |
2016 | ||
4cdc7696 | 2017 | symcount = (symtab_hdr->sh_size |
df406460 NC |
2018 | / sizeof (Elf32_External_Sym) |
2019 | - symtab_hdr->sh_info); | |
2020 | sym_hashes = elf_sym_hashes (abfd); | |
2021 | end_hashes = sym_hashes + symcount; | |
2022 | for (; sym_hashes < end_hashes; sym_hashes++) | |
2023 | { | |
4cdc7696 | 2024 | struct elf_link_hash_entry *sym_hash = |
df406460 NC |
2025 | *sym_hashes; |
2026 | if ((sym_hash->root.type == bfd_link_hash_defined | |
4cdc7696 NC |
2027 | || sym_hash->root.type == |
2028 | bfd_link_hash_defweak) | |
df406460 | 2029 | && sym_hash->root.u.def.section == sec |
4cdc7696 | 2030 | && sym_hash->root.u.def.value == section_offset_of_ret_insn) |
df406460 NC |
2031 | { |
2032 | deleting_ret_is_safe = 0; | |
28c9d252 | 2033 | if (debug_relax) |
df406460 NC |
2034 | printf ("global label prevents deletion of " |
2035 | "ret insn at address 0x%x\n", | |
2036 | (int) dot + insn_size); | |
2037 | } | |
2038 | } | |
2039 | } | |
2040 | /* Now we check for relocations pointing to ret. */ | |
2041 | { | |
2042 | Elf_Internal_Rela *irel; | |
2043 | Elf_Internal_Rela *relend; | |
2044 | Elf_Internal_Shdr *symtab_hdr; | |
2045 | ||
4cdc7696 NC |
2046 | symtab_hdr = &elf_tdata (abfd)->symtab_hdr; |
2047 | relend = elf_section_data (sec)->relocs | |
df406460 NC |
2048 | + sec->reloc_count; |
2049 | ||
4cdc7696 | 2050 | for (irel = elf_section_data (sec)->relocs; |
df406460 NC |
2051 | irel < relend; irel++) |
2052 | { | |
2053 | bfd_vma reloc_target = 0; | |
2054 | bfd_vma symval; | |
2055 | Elf_Internal_Sym *isymbuf = NULL; | |
4cdc7696 NC |
2056 | |
2057 | /* Read this BFD's local symbols if we haven't | |
df406460 NC |
2058 | done so already. */ |
2059 | if (isymbuf == NULL && symtab_hdr->sh_info != 0) | |
2060 | { | |
4cdc7696 | 2061 | isymbuf = (Elf_Internal_Sym *) |
df406460 NC |
2062 | symtab_hdr->contents; |
2063 | if (isymbuf == NULL) | |
4cdc7696 NC |
2064 | isymbuf = bfd_elf_get_elf_syms |
2065 | (abfd, | |
2066 | symtab_hdr, | |
2067 | symtab_hdr->sh_info, 0, | |
2068 | NULL, NULL, NULL); | |
df406460 NC |
2069 | if (isymbuf == NULL) |
2070 | break; | |
2071 | } | |
4cdc7696 NC |
2072 | |
2073 | /* Get the value of the symbol referred to | |
df406460 | 2074 | by the reloc. */ |
4cdc7696 | 2075 | if (ELF32_R_SYM (irel->r_info) |
df406460 NC |
2076 | < symtab_hdr->sh_info) |
2077 | { | |
2078 | /* A local symbol. */ | |
2079 | Elf_Internal_Sym *isym; | |
2080 | asection *sym_sec; | |
2081 | ||
4cdc7696 | 2082 | isym = isymbuf |
df406460 | 2083 | + ELF32_R_SYM (irel->r_info); |
4cdc7696 NC |
2084 | sym_sec = bfd_section_from_elf_index |
2085 | (abfd, isym->st_shndx); | |
2086 | symval = isym->st_value; | |
2087 | ||
2088 | /* If the reloc is absolute, it will not | |
df406460 NC |
2089 | have a symbol or section associated |
2090 | with it. */ | |
4cdc7696 | 2091 | |
df406460 | 2092 | if (sym_sec) |
4cdc7696 NC |
2093 | { |
2094 | symval += | |
df406460 NC |
2095 | sym_sec->output_section->vma |
2096 | + sym_sec->output_offset; | |
2097 | reloc_target = symval + irel->r_addend; | |
2098 | } | |
2099 | else | |
2100 | { | |
2101 | reloc_target = symval + irel->r_addend; | |
4cdc7696 | 2102 | /* Reference symbol is absolute. */ |
df406460 NC |
2103 | } |
2104 | } | |
4cdc7696 NC |
2105 | /* else ... reference symbol is extern. */ |
2106 | ||
df406460 | 2107 | if (address_of_ret == reloc_target) |
4cdc7696 | 2108 | { |
df406460 | 2109 | deleting_ret_is_safe = 0; |
28c9d252 | 2110 | if (debug_relax) |
df406460 NC |
2111 | printf ("ret from " |
2112 | "rjmp/jmp ret sequence at address" | |
2113 | " 0x%x could not be deleted. ret" | |
2114 | " is target of a relocation.\n", | |
2115 | (int) address_of_ret); | |
2116 | } | |
2117 | } | |
2118 | } | |
2119 | ||
2120 | if (deleting_ret_is_safe) | |
2121 | { | |
28c9d252 | 2122 | if (debug_relax) |
df406460 NC |
2123 | printf ("unreachable ret instruction " |
2124 | "at address 0x%x deleted.\n", | |
2125 | (int) dot + insn_size); | |
4cdc7696 | 2126 | |
df406460 NC |
2127 | /* Delete two bytes of data. */ |
2128 | if (!elf32_avr_relax_delete_bytes (abfd, sec, | |
2129 | irel->r_offset + insn_size, 2)) | |
2130 | goto error_return; | |
2131 | ||
4cdc7696 NC |
2132 | /* That will change things, so, we should relax |
2133 | again. Note that this is not required, and it | |
df406460 | 2134 | may be slow. */ |
df406460 NC |
2135 | *again = TRUE; |
2136 | break; | |
2137 | } | |
2138 | } | |
4cdc7696 NC |
2139 | |
2140 | } | |
2141 | } | |
df406460 NC |
2142 | break; |
2143 | } | |
2144 | } | |
2145 | } | |
2146 | ||
2147 | if (contents != NULL | |
2148 | && elf_section_data (sec)->this_hdr.contents != contents) | |
2149 | { | |
2150 | if (! link_info->keep_memory) | |
2151 | free (contents); | |
2152 | else | |
2153 | { | |
2154 | /* Cache the section contents for elf_link_input_bfd. */ | |
2155 | elf_section_data (sec)->this_hdr.contents = contents; | |
2156 | } | |
2157 | } | |
2158 | ||
2159 | if (internal_relocs != NULL | |
2160 | && elf_section_data (sec)->relocs != internal_relocs) | |
2161 | free (internal_relocs); | |
2162 | ||
2163 | return TRUE; | |
2164 | ||
2165 | error_return: | |
2166 | if (isymbuf != NULL | |
2167 | && symtab_hdr->contents != (unsigned char *) isymbuf) | |
2168 | free (isymbuf); | |
2169 | if (contents != NULL | |
2170 | && elf_section_data (sec)->this_hdr.contents != contents) | |
2171 | free (contents); | |
2172 | if (internal_relocs != NULL | |
2173 | && elf_section_data (sec)->relocs != internal_relocs) | |
2174 | free (internal_relocs); | |
2175 | ||
4cdc7696 | 2176 | return FALSE; |
df406460 NC |
2177 | } |
2178 | ||
2179 | /* This is a version of bfd_generic_get_relocated_section_contents | |
4cdc7696 | 2180 | which uses elf32_avr_relocate_section. |
df406460 | 2181 | |
4cdc7696 | 2182 | For avr it's essentially a cut and paste taken from the H8300 port. |
df406460 | 2183 | The author of the relaxation support patch for avr had absolutely no |
4cdc7696 | 2184 | clue what is happening here but found out that this part of the code |
df406460 NC |
2185 | seems to be important. */ |
2186 | ||
2187 | static bfd_byte * | |
2188 | elf32_avr_get_relocated_section_contents (bfd *output_bfd, | |
2189 | struct bfd_link_info *link_info, | |
2190 | struct bfd_link_order *link_order, | |
2191 | bfd_byte *data, | |
2192 | bfd_boolean relocatable, | |
2193 | asymbol **symbols) | |
2194 | { | |
2195 | Elf_Internal_Shdr *symtab_hdr; | |
2196 | asection *input_section = link_order->u.indirect.section; | |
2197 | bfd *input_bfd = input_section->owner; | |
2198 | asection **sections = NULL; | |
2199 | Elf_Internal_Rela *internal_relocs = NULL; | |
2200 | Elf_Internal_Sym *isymbuf = NULL; | |
2201 | ||
2202 | /* We only need to handle the case of relaxing, or of having a | |
2203 | particular set of section contents, specially. */ | |
2204 | if (relocatable | |
2205 | || elf_section_data (input_section)->this_hdr.contents == NULL) | |
2206 | return bfd_generic_get_relocated_section_contents (output_bfd, link_info, | |
2207 | link_order, data, | |
2208 | relocatable, | |
2209 | symbols); | |
2210 | symtab_hdr = &elf_tdata (input_bfd)->symtab_hdr; | |
2211 | ||
2212 | memcpy (data, elf_section_data (input_section)->this_hdr.contents, | |
2213 | (size_t) input_section->size); | |
2214 | ||
2215 | if ((input_section->flags & SEC_RELOC) != 0 | |
2216 | && input_section->reloc_count > 0) | |
2217 | { | |
2218 | asection **secpp; | |
2219 | Elf_Internal_Sym *isym, *isymend; | |
2220 | bfd_size_type amt; | |
2221 | ||
2222 | internal_relocs = (_bfd_elf_link_read_relocs | |
4cdc7696 | 2223 | (input_bfd, input_section, NULL, NULL, FALSE)); |
df406460 NC |
2224 | if (internal_relocs == NULL) |
2225 | goto error_return; | |
2226 | ||
2227 | if (symtab_hdr->sh_info != 0) | |
2228 | { | |
2229 | isymbuf = (Elf_Internal_Sym *) symtab_hdr->contents; | |
2230 | if (isymbuf == NULL) | |
2231 | isymbuf = bfd_elf_get_elf_syms (input_bfd, symtab_hdr, | |
2232 | symtab_hdr->sh_info, 0, | |
2233 | NULL, NULL, NULL); | |
2234 | if (isymbuf == NULL) | |
2235 | goto error_return; | |
2236 | } | |
2237 | ||
2238 | amt = symtab_hdr->sh_info; | |
2239 | amt *= sizeof (asection *); | |
4cdc7696 | 2240 | sections = bfd_malloc (amt); |
df406460 NC |
2241 | if (sections == NULL && amt != 0) |
2242 | goto error_return; | |
2243 | ||
2244 | isymend = isymbuf + symtab_hdr->sh_info; | |
2245 | for (isym = isymbuf, secpp = sections; isym < isymend; ++isym, ++secpp) | |
2246 | { | |
2247 | asection *isec; | |
2248 | ||
2249 | if (isym->st_shndx == SHN_UNDEF) | |
2250 | isec = bfd_und_section_ptr; | |
2251 | else if (isym->st_shndx == SHN_ABS) | |
2252 | isec = bfd_abs_section_ptr; | |
2253 | else if (isym->st_shndx == SHN_COMMON) | |
2254 | isec = bfd_com_section_ptr; | |
2255 | else | |
2256 | isec = bfd_section_from_elf_index (input_bfd, isym->st_shndx); | |
2257 | ||
2258 | *secpp = isec; | |
2259 | } | |
2260 | ||
2261 | if (! elf32_avr_relocate_section (output_bfd, link_info, input_bfd, | |
2262 | input_section, data, internal_relocs, | |
2263 | isymbuf, sections)) | |
2264 | goto error_return; | |
2265 | ||
2266 | if (sections != NULL) | |
2267 | free (sections); | |
2268 | if (isymbuf != NULL | |
2269 | && symtab_hdr->contents != (unsigned char *) isymbuf) | |
2270 | free (isymbuf); | |
2271 | if (elf_section_data (input_section)->relocs != internal_relocs) | |
2272 | free (internal_relocs); | |
2273 | } | |
2274 | ||
2275 | return data; | |
2276 | ||
2277 | error_return: | |
2278 | if (sections != NULL) | |
2279 | free (sections); | |
2280 | if (isymbuf != NULL | |
2281 | && symtab_hdr->contents != (unsigned char *) isymbuf) | |
2282 | free (isymbuf); | |
2283 | if (internal_relocs != NULL | |
2284 | && elf_section_data (input_section)->relocs != internal_relocs) | |
2285 | free (internal_relocs); | |
2286 | return NULL; | |
2287 | } | |
2288 | ||
2289 | ||
28c9d252 NC |
2290 | /* Determines the hash entry name for a particular reloc. It consists of |
2291 | the identifier of the symbol section and the added reloc addend and | |
2292 | symbol offset relative to the section the symbol is attached to. */ | |
2293 | ||
2294 | static char * | |
2295 | avr_stub_name (const asection *symbol_section, | |
2296 | const bfd_vma symbol_offset, | |
2297 | const Elf_Internal_Rela *rela) | |
2298 | { | |
2299 | char *stub_name; | |
2300 | bfd_size_type len; | |
2301 | ||
2302 | len = 8 + 1 + 8 + 1 + 1; | |
2303 | stub_name = bfd_malloc (len); | |
2304 | ||
2305 | sprintf (stub_name, "%08x+%08x", | |
2306 | symbol_section->id & 0xffffffff, | |
2307 | (unsigned int) ((rela->r_addend & 0xffffffff) + symbol_offset)); | |
2308 | ||
2309 | return stub_name; | |
2310 | } | |
2311 | ||
2312 | ||
2313 | /* Add a new stub entry to the stub hash. Not all fields of the new | |
2314 | stub entry are initialised. */ | |
2315 | ||
2316 | static struct elf32_avr_stub_hash_entry * | |
2317 | avr_add_stub (const char *stub_name, | |
2318 | struct elf32_avr_link_hash_table *htab) | |
2319 | { | |
2320 | struct elf32_avr_stub_hash_entry *hsh; | |
2321 | ||
2322 | /* Enter this entry into the linker stub hash table. */ | |
2323 | hsh = avr_stub_hash_lookup (&htab->bstab, stub_name, TRUE, FALSE); | |
2324 | ||
2325 | if (hsh == NULL) | |
2326 | { | |
2327 | (*_bfd_error_handler) (_("%B: cannot create stub entry %s"), | |
2328 | NULL, stub_name); | |
2329 | return NULL; | |
2330 | } | |
2331 | ||
2332 | hsh->stub_offset = 0; | |
2333 | return hsh; | |
2334 | } | |
2335 | ||
2336 | /* We assume that there is already space allocated for the stub section | |
2337 | contents and that before building the stubs the section size is | |
2338 | initialized to 0. We assume that within the stub hash table entry, | |
2339 | the absolute position of the jmp target has been written in the | |
2340 | target_value field. We write here the offset of the generated jmp insn | |
2341 | relative to the trampoline section start to the stub_offset entry in | |
2342 | the stub hash table entry. */ | |
2343 | ||
2344 | static bfd_boolean | |
2345 | avr_build_one_stub (struct bfd_hash_entry *bh, void *in_arg) | |
2346 | { | |
2347 | struct elf32_avr_stub_hash_entry *hsh; | |
2348 | struct bfd_link_info *info; | |
2349 | struct elf32_avr_link_hash_table *htab; | |
2350 | bfd *stub_bfd; | |
2351 | bfd_byte *loc; | |
2352 | bfd_vma target; | |
2353 | bfd_vma starget; | |
2354 | ||
2355 | /* Basic opcode */ | |
2356 | bfd_vma jmp_insn = 0x0000940c; | |
2357 | ||
2358 | /* Massage our args to the form they really have. */ | |
2359 | hsh = avr_stub_hash_entry (bh); | |
2360 | ||
2361 | if (!hsh->is_actually_needed) | |
2362 | return TRUE; | |
2363 | ||
2364 | info = (struct bfd_link_info *) in_arg; | |
2365 | ||
2366 | htab = avr_link_hash_table (info); | |
2367 | ||
2368 | target = hsh->target_value; | |
2369 | ||
2370 | /* Make a note of the offset within the stubs for this entry. */ | |
2371 | hsh->stub_offset = htab->stub_sec->size; | |
2372 | loc = htab->stub_sec->contents + hsh->stub_offset; | |
2373 | ||
2374 | stub_bfd = htab->stub_sec->owner; | |
2375 | ||
2376 | if (debug_stubs) | |
2377 | printf ("Building one Stub. Address: 0x%x, Offset: 0x%x\n", | |
2378 | (unsigned int) target, | |
2379 | (unsigned int) hsh->stub_offset); | |
2380 | ||
2381 | /* We now have to add the information on the jump target to the bare | |
2382 | opcode bits already set in jmp_insn. */ | |
2383 | ||
2384 | /* Check for the alignment of the address. */ | |
2385 | if (target & 1) | |
2386 | return FALSE; | |
2387 | ||
2388 | starget = target >> 1; | |
2389 | jmp_insn |= ((starget & 0x10000) | ((starget << 3) & 0x1f00000)) >> 16; | |
2390 | bfd_put_16 (stub_bfd, jmp_insn, loc); | |
2391 | bfd_put_16 (stub_bfd, (bfd_vma) starget & 0xffff, loc + 2); | |
2392 | ||
2393 | htab->stub_sec->size += 4; | |
2394 | ||
2395 | /* Now add the entries in the address mapping table if there is still | |
2396 | space left. */ | |
2397 | { | |
2398 | unsigned int nr; | |
2399 | ||
2400 | nr = htab->amt_entry_cnt + 1; | |
2401 | if (nr <= htab->amt_max_entry_cnt) | |
2402 | { | |
2403 | htab->amt_entry_cnt = nr; | |
2404 | ||
2405 | htab->amt_stub_offsets[nr - 1] = hsh->stub_offset; | |
2406 | htab->amt_destination_addr[nr - 1] = target; | |
2407 | } | |
2408 | } | |
2409 | ||
2410 | return TRUE; | |
2411 | } | |
2412 | ||
2413 | static bfd_boolean | |
2414 | avr_mark_stub_not_to_be_necessary (struct bfd_hash_entry *bh, | |
2415 | void *in_arg) | |
2416 | { | |
2417 | struct elf32_avr_stub_hash_entry *hsh; | |
2418 | struct elf32_avr_link_hash_table *htab; | |
2419 | ||
2420 | htab = in_arg; | |
2421 | hsh = avr_stub_hash_entry (bh); | |
2422 | hsh->is_actually_needed = FALSE; | |
2423 | ||
2424 | return TRUE; | |
2425 | } | |
2426 | ||
2427 | static bfd_boolean | |
2428 | avr_size_one_stub (struct bfd_hash_entry *bh, void *in_arg) | |
2429 | { | |
2430 | struct elf32_avr_stub_hash_entry *hsh; | |
2431 | struct elf32_avr_link_hash_table *htab; | |
2432 | int size; | |
2433 | ||
2434 | /* Massage our args to the form they really have. */ | |
2435 | hsh = avr_stub_hash_entry (bh); | |
2436 | htab = in_arg; | |
2437 | ||
2438 | if (hsh->is_actually_needed) | |
2439 | size = 4; | |
2440 | else | |
2441 | size = 0; | |
2442 | ||
2443 | htab->stub_sec->size += size; | |
2444 | return TRUE; | |
2445 | } | |
2446 | ||
2447 | void | |
2448 | elf32_avr_setup_params (struct bfd_link_info *info, | |
2449 | bfd *avr_stub_bfd, | |
2450 | asection *avr_stub_section, | |
2451 | bfd_boolean no_stubs, | |
2452 | bfd_boolean deb_stubs, | |
2453 | bfd_boolean deb_relax, | |
2454 | bfd_vma pc_wrap_around, | |
2455 | bfd_boolean call_ret_replacement) | |
2456 | { | |
2457 | struct elf32_avr_link_hash_table *htab = avr_link_hash_table(info); | |
2458 | ||
2459 | htab->stub_sec = avr_stub_section; | |
2460 | htab->stub_bfd = avr_stub_bfd; | |
2461 | htab->no_stubs = no_stubs; | |
2462 | ||
2463 | debug_relax = deb_relax; | |
2464 | debug_stubs = deb_stubs; | |
2465 | avr_pc_wrap_around = pc_wrap_around; | |
2466 | avr_replace_call_ret_sequences = call_ret_replacement; | |
2467 | } | |
2468 | ||
2469 | ||
2470 | /* Set up various things so that we can make a list of input sections | |
2471 | for each output section included in the link. Returns -1 on error, | |
2472 | 0 when no stubs will be needed, and 1 on success. It also sets | |
2473 | information on the stubs bfd and the stub section in the info | |
2474 | struct. */ | |
2475 | ||
2476 | int | |
2477 | elf32_avr_setup_section_lists (bfd *output_bfd, | |
2478 | struct bfd_link_info *info) | |
2479 | { | |
2480 | bfd *input_bfd; | |
2481 | unsigned int bfd_count; | |
2482 | int top_id, top_index; | |
2483 | asection *section; | |
2484 | asection **input_list, **list; | |
2485 | bfd_size_type amt; | |
2486 | struct elf32_avr_link_hash_table *htab = avr_link_hash_table(info); | |
2487 | ||
2488 | if (htab->no_stubs) | |
2489 | return 0; | |
2490 | ||
2491 | /* Count the number of input BFDs and find the top input section id. */ | |
2492 | for (input_bfd = info->input_bfds, bfd_count = 0, top_id = 0; | |
2493 | input_bfd != NULL; | |
2494 | input_bfd = input_bfd->link_next) | |
2495 | { | |
2496 | bfd_count += 1; | |
2497 | for (section = input_bfd->sections; | |
2498 | section != NULL; | |
2499 | section = section->next) | |
2500 | if (top_id < section->id) | |
2501 | top_id = section->id; | |
2502 | } | |
2503 | ||
2504 | htab->bfd_count = bfd_count; | |
2505 | ||
2506 | /* We can't use output_bfd->section_count here to find the top output | |
2507 | section index as some sections may have been removed, and | |
2508 | strip_excluded_output_sections doesn't renumber the indices. */ | |
2509 | for (section = output_bfd->sections, top_index = 0; | |
2510 | section != NULL; | |
2511 | section = section->next) | |
2512 | if (top_index < section->index) | |
2513 | top_index = section->index; | |
2514 | ||
2515 | htab->top_index = top_index; | |
2516 | amt = sizeof (asection *) * (top_index + 1); | |
2517 | input_list = bfd_malloc (amt); | |
2518 | htab->input_list = input_list; | |
2519 | if (input_list == NULL) | |
2520 | return -1; | |
2521 | ||
2522 | /* For sections we aren't interested in, mark their entries with a | |
2523 | value we can check later. */ | |
2524 | list = input_list + top_index; | |
2525 | do | |
2526 | *list = bfd_abs_section_ptr; | |
2527 | while (list-- != input_list); | |
2528 | ||
2529 | for (section = output_bfd->sections; | |
2530 | section != NULL; | |
2531 | section = section->next) | |
2532 | if ((section->flags & SEC_CODE) != 0) | |
2533 | input_list[section->index] = NULL; | |
2534 | ||
2535 | return 1; | |
2536 | } | |
2537 | ||
2538 | ||
2539 | /* Read in all local syms for all input bfds, and create hash entries | |
2540 | for export stubs if we are building a multi-subspace shared lib. | |
2541 | Returns -1 on error, 0 otherwise. */ | |
2542 | ||
2543 | static int | |
2544 | get_local_syms (bfd *input_bfd, struct bfd_link_info *info) | |
2545 | { | |
2546 | unsigned int bfd_indx; | |
2547 | Elf_Internal_Sym *local_syms, **all_local_syms; | |
2548 | struct elf32_avr_link_hash_table *htab = avr_link_hash_table (info); | |
2549 | ||
2550 | /* We want to read in symbol extension records only once. To do this | |
2551 | we need to read in the local symbols in parallel and save them for | |
2552 | later use; so hold pointers to the local symbols in an array. */ | |
2553 | bfd_size_type amt = sizeof (Elf_Internal_Sym *) * htab->bfd_count; | |
2554 | all_local_syms = bfd_zmalloc (amt); | |
2555 | htab->all_local_syms = all_local_syms; | |
2556 | if (all_local_syms == NULL) | |
2557 | return -1; | |
2558 | ||
2559 | /* Walk over all the input BFDs, swapping in local symbols. | |
2560 | If we are creating a shared library, create hash entries for the | |
2561 | export stubs. */ | |
2562 | for (bfd_indx = 0; | |
2563 | input_bfd != NULL; | |
2564 | input_bfd = input_bfd->link_next, bfd_indx++) | |
2565 | { | |
2566 | Elf_Internal_Shdr *symtab_hdr; | |
2567 | ||
2568 | /* We'll need the symbol table in a second. */ | |
2569 | symtab_hdr = &elf_tdata (input_bfd)->symtab_hdr; | |
2570 | if (symtab_hdr->sh_info == 0) | |
2571 | continue; | |
2572 | ||
2573 | /* We need an array of the local symbols attached to the input bfd. */ | |
2574 | local_syms = (Elf_Internal_Sym *) symtab_hdr->contents; | |
2575 | if (local_syms == NULL) | |
2576 | { | |
2577 | local_syms = bfd_elf_get_elf_syms (input_bfd, symtab_hdr, | |
2578 | symtab_hdr->sh_info, 0, | |
2579 | NULL, NULL, NULL); | |
2580 | /* Cache them for elf_link_input_bfd. */ | |
2581 | symtab_hdr->contents = (unsigned char *) local_syms; | |
2582 | } | |
2583 | if (local_syms == NULL) | |
2584 | return -1; | |
2585 | ||
2586 | all_local_syms[bfd_indx] = local_syms; | |
2587 | } | |
2588 | ||
2589 | return 0; | |
2590 | } | |
2591 | ||
2592 | #define ADD_DUMMY_STUBS_FOR_DEBUGGING 0 | |
2593 | ||
2594 | bfd_boolean | |
2595 | elf32_avr_size_stubs (bfd *output_bfd, | |
2596 | struct bfd_link_info *info, | |
2597 | bfd_boolean is_prealloc_run) | |
2598 | { | |
2599 | struct elf32_avr_link_hash_table *htab; | |
2600 | int stub_changed = 0; | |
2601 | ||
2602 | htab = avr_link_hash_table (info); | |
2603 | ||
2604 | /* At this point we initialize htab->vector_base | |
2605 | To the start of the text output section. */ | |
2606 | htab->vector_base = htab->stub_sec->output_section->vma; | |
2607 | ||
2608 | if (get_local_syms (info->input_bfds, info)) | |
2609 | { | |
2610 | if (htab->all_local_syms) | |
2611 | goto error_ret_free_local; | |
2612 | return FALSE; | |
2613 | } | |
2614 | ||
2615 | if (ADD_DUMMY_STUBS_FOR_DEBUGGING) | |
2616 | { | |
2617 | struct elf32_avr_stub_hash_entry *test; | |
2618 | ||
2619 | test = avr_add_stub ("Hugo",htab); | |
2620 | test->target_value = 0x123456; | |
2621 | test->stub_offset = 13; | |
2622 | ||
2623 | test = avr_add_stub ("Hugo2",htab); | |
2624 | test->target_value = 0x84210; | |
2625 | test->stub_offset = 14; | |
2626 | } | |
2627 | ||
2628 | while (1) | |
2629 | { | |
2630 | bfd *input_bfd; | |
2631 | unsigned int bfd_indx; | |
2632 | ||
2633 | /* We will have to re-generate the stub hash table each time anything | |
2634 | in memory has changed. */ | |
2635 | ||
2636 | bfd_hash_traverse (&htab->bstab, avr_mark_stub_not_to_be_necessary, htab); | |
2637 | for (input_bfd = info->input_bfds, bfd_indx = 0; | |
2638 | input_bfd != NULL; | |
2639 | input_bfd = input_bfd->link_next, bfd_indx++) | |
2640 | { | |
2641 | Elf_Internal_Shdr *symtab_hdr; | |
2642 | asection *section; | |
2643 | Elf_Internal_Sym *local_syms; | |
2644 | ||
2645 | /* We'll need the symbol table in a second. */ | |
2646 | symtab_hdr = &elf_tdata (input_bfd)->symtab_hdr; | |
2647 | if (symtab_hdr->sh_info == 0) | |
2648 | continue; | |
2649 | ||
2650 | local_syms = htab->all_local_syms[bfd_indx]; | |
2651 | ||
2652 | /* Walk over each section attached to the input bfd. */ | |
2653 | for (section = input_bfd->sections; | |
2654 | section != NULL; | |
2655 | section = section->next) | |
2656 | { | |
2657 | Elf_Internal_Rela *internal_relocs, *irelaend, *irela; | |
2658 | ||
2659 | /* If there aren't any relocs, then there's nothing more | |
2660 | to do. */ | |
2661 | if ((section->flags & SEC_RELOC) == 0 | |
2662 | || section->reloc_count == 0) | |
2663 | continue; | |
2664 | ||
2665 | /* If this section is a link-once section that will be | |
2666 | discarded, then don't create any stubs. */ | |
2667 | if (section->output_section == NULL | |
2668 | || section->output_section->owner != output_bfd) | |
2669 | continue; | |
2670 | ||
2671 | /* Get the relocs. */ | |
2672 | internal_relocs | |
2673 | = _bfd_elf_link_read_relocs (input_bfd, section, NULL, NULL, | |
2674 | info->keep_memory); | |
2675 | if (internal_relocs == NULL) | |
2676 | goto error_ret_free_local; | |
2677 | ||
2678 | /* Now examine each relocation. */ | |
2679 | irela = internal_relocs; | |
2680 | irelaend = irela + section->reloc_count; | |
2681 | for (; irela < irelaend; irela++) | |
2682 | { | |
2683 | unsigned int r_type, r_indx; | |
2684 | struct elf32_avr_stub_hash_entry *hsh; | |
2685 | asection *sym_sec; | |
2686 | bfd_vma sym_value; | |
2687 | bfd_vma destination; | |
2688 | struct elf_link_hash_entry *hh; | |
2689 | char *stub_name; | |
2690 | ||
2691 | r_type = ELF32_R_TYPE (irela->r_info); | |
2692 | r_indx = ELF32_R_SYM (irela->r_info); | |
2693 | ||
2694 | /* Only look for 16 bit GS relocs. No other reloc will need a | |
2695 | stub. */ | |
2696 | if (!((r_type == R_AVR_16_PM) | |
2697 | || (r_type == R_AVR_LO8_LDI_GS) | |
2698 | || (r_type == R_AVR_HI8_LDI_GS))) | |
2699 | continue; | |
2700 | ||
2701 | /* Now determine the call target, its name, value, | |
2702 | section. */ | |
2703 | sym_sec = NULL; | |
2704 | sym_value = 0; | |
2705 | destination = 0; | |
2706 | hh = NULL; | |
2707 | if (r_indx < symtab_hdr->sh_info) | |
2708 | { | |
2709 | /* It's a local symbol. */ | |
2710 | Elf_Internal_Sym *sym; | |
2711 | Elf_Internal_Shdr *hdr; | |
2712 | ||
2713 | sym = local_syms + r_indx; | |
2714 | hdr = elf_elfsections (input_bfd)[sym->st_shndx]; | |
2715 | sym_sec = hdr->bfd_section; | |
2716 | if (ELF_ST_TYPE (sym->st_info) != STT_SECTION) | |
2717 | sym_value = sym->st_value; | |
2718 | destination = (sym_value + irela->r_addend | |
2719 | + sym_sec->output_offset | |
2720 | + sym_sec->output_section->vma); | |
2721 | } | |
2722 | else | |
2723 | { | |
2724 | /* It's an external symbol. */ | |
2725 | int e_indx; | |
2726 | ||
2727 | e_indx = r_indx - symtab_hdr->sh_info; | |
2728 | hh = elf_sym_hashes (input_bfd)[e_indx]; | |
2729 | ||
2730 | while (hh->root.type == bfd_link_hash_indirect | |
2731 | || hh->root.type == bfd_link_hash_warning) | |
2732 | hh = (struct elf_link_hash_entry *) | |
2733 | (hh->root.u.i.link); | |
2734 | ||
2735 | if (hh->root.type == bfd_link_hash_defined | |
2736 | || hh->root.type == bfd_link_hash_defweak) | |
2737 | { | |
2738 | sym_sec = hh->root.u.def.section; | |
2739 | sym_value = hh->root.u.def.value; | |
2740 | if (sym_sec->output_section != NULL) | |
2741 | destination = (sym_value + irela->r_addend | |
2742 | + sym_sec->output_offset | |
2743 | + sym_sec->output_section->vma); | |
2744 | } | |
2745 | else if (hh->root.type == bfd_link_hash_undefweak) | |
2746 | { | |
2747 | if (! info->shared) | |
2748 | continue; | |
2749 | } | |
2750 | else if (hh->root.type == bfd_link_hash_undefined) | |
2751 | { | |
2752 | if (! (info->unresolved_syms_in_objects == RM_IGNORE | |
2753 | && (ELF_ST_VISIBILITY (hh->other) | |
2754 | == STV_DEFAULT))) | |
2755 | continue; | |
2756 | } | |
2757 | else | |
2758 | { | |
2759 | bfd_set_error (bfd_error_bad_value); | |
2760 | ||
2761 | error_ret_free_internal: | |
2762 | if (elf_section_data (section)->relocs == NULL) | |
2763 | free (internal_relocs); | |
2764 | goto error_ret_free_local; | |
2765 | } | |
2766 | } | |
2767 | ||
2768 | if (! avr_stub_is_required_for_16_bit_reloc | |
2769 | (destination - htab->vector_base)) | |
2770 | { | |
2771 | if (!is_prealloc_run) | |
2772 | /* We are having a reloc that does't need a stub. */ | |
2773 | continue; | |
2774 | ||
2775 | /* We don't right now know if a stub will be needed. | |
2776 | Let's rather be on the safe side. */ | |
2777 | } | |
2778 | ||
2779 | /* Get the name of this stub. */ | |
2780 | stub_name = avr_stub_name (sym_sec, sym_value, irela); | |
2781 | ||
2782 | if (!stub_name) | |
2783 | goto error_ret_free_internal; | |
2784 | ||
2785 | ||
2786 | hsh = avr_stub_hash_lookup (&htab->bstab, | |
2787 | stub_name, | |
2788 | FALSE, FALSE); | |
2789 | if (hsh != NULL) | |
2790 | { | |
2791 | /* The proper stub has already been created. Mark it | |
2792 | to be used and write the possibly changed destination | |
2793 | value. */ | |
2794 | hsh->is_actually_needed = TRUE; | |
2795 | hsh->target_value = destination; | |
2796 | free (stub_name); | |
2797 | continue; | |
2798 | } | |
2799 | ||
2800 | hsh = avr_add_stub (stub_name, htab); | |
2801 | if (hsh == NULL) | |
2802 | { | |
2803 | free (stub_name); | |
2804 | goto error_ret_free_internal; | |
2805 | } | |
2806 | ||
2807 | hsh->is_actually_needed = TRUE; | |
2808 | hsh->target_value = destination; | |
2809 | ||
2810 | if (debug_stubs) | |
2811 | printf ("Adding stub with destination 0x%x to the" | |
2812 | " hash table.\n", (unsigned int) destination); | |
2813 | if (debug_stubs) | |
2814 | printf ("(Pre-Alloc run: %i)\n", is_prealloc_run); | |
2815 | ||
2816 | stub_changed = TRUE; | |
2817 | } | |
2818 | ||
2819 | /* We're done with the internal relocs, free them. */ | |
2820 | if (elf_section_data (section)->relocs == NULL) | |
2821 | free (internal_relocs); | |
2822 | } | |
2823 | } | |
2824 | ||
2825 | /* Re-Calculate the number of needed stubs. */ | |
2826 | htab->stub_sec->size = 0; | |
2827 | bfd_hash_traverse (&htab->bstab, avr_size_one_stub, htab); | |
2828 | ||
2829 | if (!stub_changed) | |
2830 | break; | |
2831 | ||
2832 | stub_changed = FALSE; | |
2833 | } | |
2834 | ||
2835 | free (htab->all_local_syms); | |
2836 | return TRUE; | |
2837 | ||
2838 | error_ret_free_local: | |
2839 | free (htab->all_local_syms); | |
2840 | return FALSE; | |
2841 | } | |
2842 | ||
2843 | ||
2844 | /* Build all the stubs associated with the current output file. The | |
2845 | stubs are kept in a hash table attached to the main linker hash | |
2846 | table. We also set up the .plt entries for statically linked PIC | |
2847 | functions here. This function is called via hppaelf_finish in the | |
2848 | linker. */ | |
2849 | ||
2850 | bfd_boolean | |
2851 | elf32_avr_build_stubs (struct bfd_link_info *info) | |
2852 | { | |
2853 | asection *stub_sec; | |
2854 | struct bfd_hash_table *table; | |
2855 | struct elf32_avr_link_hash_table *htab; | |
2856 | bfd_size_type total_size = 0; | |
2857 | ||
2858 | htab = avr_link_hash_table (info); | |
2859 | ||
2860 | /* In case that there were several stub sections: */ | |
2861 | for (stub_sec = htab->stub_bfd->sections; | |
2862 | stub_sec != NULL; | |
2863 | stub_sec = stub_sec->next) | |
2864 | { | |
2865 | bfd_size_type size; | |
2866 | ||
2867 | /* Allocate memory to hold the linker stubs. */ | |
2868 | size = stub_sec->size; | |
2869 | total_size += size; | |
2870 | ||
2871 | stub_sec->contents = bfd_zalloc (htab->stub_bfd, size); | |
2872 | if (stub_sec->contents == NULL && size != 0) | |
2873 | return FALSE; | |
2874 | stub_sec->size = 0; | |
2875 | } | |
2876 | ||
2877 | /* Allocate memory for the adress mapping table. */ | |
2878 | htab->amt_entry_cnt = 0; | |
2879 | htab->amt_max_entry_cnt = total_size / 4; | |
2880 | htab->amt_stub_offsets = bfd_malloc (sizeof (bfd_vma) | |
2881 | * htab->amt_max_entry_cnt); | |
2882 | htab->amt_destination_addr = bfd_malloc (sizeof (bfd_vma) | |
2883 | * htab->amt_max_entry_cnt ); | |
2884 | ||
2885 | if (debug_stubs) | |
2886 | printf ("Allocating %i entries in the AMT\n", htab->amt_max_entry_cnt); | |
2887 | ||
2888 | /* Build the stubs as directed by the stub hash table. */ | |
2889 | table = &htab->bstab; | |
2890 | bfd_hash_traverse (table, avr_build_one_stub, info); | |
2891 | ||
2892 | if (debug_stubs) | |
2893 | printf ("Final Stub section Size: %i\n", (int) htab->stub_sec->size); | |
2894 | ||
2895 | return TRUE; | |
2896 | } | |
2897 | ||
adde6300 AM |
2898 | #define ELF_ARCH bfd_arch_avr |
2899 | #define ELF_MACHINE_CODE EM_AVR | |
aa4f99bb | 2900 | #define ELF_MACHINE_ALT1 EM_AVR_OLD |
adde6300 AM |
2901 | #define ELF_MAXPAGESIZE 1 |
2902 | ||
2903 | #define TARGET_LITTLE_SYM bfd_elf32_avr_vec | |
2904 | #define TARGET_LITTLE_NAME "elf32-avr" | |
2905 | ||
28c9d252 NC |
2906 | #define bfd_elf32_bfd_link_hash_table_create elf32_avr_link_hash_table_create |
2907 | #define bfd_elf32_bfd_link_hash_table_free elf32_avr_link_hash_table_free | |
2908 | ||
adde6300 AM |
2909 | #define elf_info_to_howto avr_info_to_howto_rela |
2910 | #define elf_info_to_howto_rel NULL | |
2911 | #define elf_backend_relocate_section elf32_avr_relocate_section | |
adde6300 AM |
2912 | #define elf_backend_check_relocs elf32_avr_check_relocs |
2913 | #define elf_backend_can_gc_sections 1 | |
f0fe0e16 | 2914 | #define elf_backend_rela_normal 1 |
adde6300 AM |
2915 | #define elf_backend_final_write_processing \ |
2916 | bfd_elf_avr_final_write_processing | |
2917 | #define elf_backend_object_p elf32_avr_object_p | |
2918 | ||
df406460 NC |
2919 | #define bfd_elf32_bfd_relax_section elf32_avr_relax_section |
2920 | #define bfd_elf32_bfd_get_relocated_section_contents \ | |
2921 | elf32_avr_get_relocated_section_contents | |
2922 | ||
adde6300 | 2923 | #include "elf32-target.h" |