1 /* Freescale XGATE-specific support for 32-bit ELF
2 Copyright (C) 2010-2023 Free Software Foundation, Inc.
3 Contributed by Sean Keys(skeys@ipdatasys.com)
4
5 This file is part of BFD, the Binary File Descriptor library.
6
7 This program is free software; you can redistribute it and/or modify
8 it under the terms of the GNU General Public License as published by
9 the Free Software Foundation; either version 3 of the License, or
10 (at your option) any later version.
11
12 This program is distributed in the hope that it will be useful,
13 but WITHOUT ANY WARRANTY; without even the implied warranty of
14 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
15 GNU General Public License for more details.
16
17 You should have received a copy of the GNU General Public License
18 along with this program; if not, write to the Free Software
19 Foundation, Inc., 51 Franklin Street - Fifth Floor, Boston,
20 MA 02110-1301, USA. */
21
22 #include "sysdep.h"
23 #include "bfd.h"
24 #include "bfdlink.h"
25 #include "libbfd.h"
26 #include "elf-bfd.h"
27 #include "elf/xgate.h"
28 #include "opcode/xgate.h"
29 #include "libiberty.h"
30
31 /* Forward declarations. */
32 static bfd_reloc_status_type xgate_elf_ignore_reloc
33 (bfd *, arelent *, asymbol *, void *, asection *, bfd *, char **);
34 static bfd_reloc_status_type xgate_elf_special_reloc
35 (bfd *, arelent *, asymbol *, void *, asection *, bfd *, char **);
36
37 /* Use REL instead of RELA to save space */
38 #define USE_REL 1
39
40 static reloc_howto_type elf_xgate_howto_table[] =
41 {
42 /* This reloc does nothing. */
43 HOWTO (R_XGATE_NONE, /* type */
44 0, /* rightshift */
45 0, /* size */
46 0, /* bitsize */
47 false, /* pc_relative */
48 0, /* bitpos */
49 complain_overflow_dont,/* complain_on_overflow */
50 bfd_elf_generic_reloc, /* special_function */
51 "R_XGATE_NONE", /* name */
52 false, /* partial_inplace */
53 0, /* src_mask */
54 0, /* dst_mask */
55 false), /* pcrel_offset */
56
57 /* A 8 bit absolute relocation. */
58 HOWTO (R_XGATE_8, /* type */
59 0, /* rightshift */
60 1, /* size */
61 8, /* bitsize */
62 false, /* pc_relative */
63 0, /* bitpos */
64 complain_overflow_bitfield, /* complain_on_overflow */
65 bfd_elf_generic_reloc, /* special_function */
66 "R_XGATE_8", /* name */
67 false, /* partial_inplace */
68 0x00ff, /* src_mask */
69 0x00ff, /* dst_mask */
70 false), /* pcrel_offset */
71
72 /* A 8 bit PC-rel relocation. */
73 HOWTO (R_XGATE_PCREL_8, /* type */
74 0, /* rightshift */
75 1, /* size */
76 8, /* bitsize */
77 true, /* pc_relative */
78 0, /* bitpos */
79 complain_overflow_bitfield, /* complain_on_overflow */
80 bfd_elf_generic_reloc, /* special_function */
81 "R_XGATE_PCREL_8", /* name */
82 false, /* partial_inplace */
83 0x00ff, /* src_mask */
84 0x00ff, /* dst_mask */
85 true), /* pcrel_offset */
86
87 /* A 16 bit absolute relocation. */
88 HOWTO (R_XGATE_16, /* type */
89 0, /* rightshift */
90 2, /* size */
91 16, /* bitsize */
92 false, /* pc_relative */
93 0, /* bitpos */
94 complain_overflow_dont /*bitfield */, /* complain_on_overflow */
95 bfd_elf_generic_reloc, /* special_function */
96 "R_XGATE_16", /* name */
97 false, /* partial_inplace */
98 0xffff, /* src_mask */
99 0xffff, /* dst_mask */
100 false), /* pcrel_offset */
101
102 /* A 32 bit absolute relocation. This one is never used for the
103 code relocation. It's used by gas for -gstabs generation. */
104 HOWTO (R_XGATE_32, /* type */
105 0, /* rightshift */
106 4, /* size */
107 32, /* bitsize */
108 false, /* pc_relative */
109 0, /* bitpos */
110 complain_overflow_bitfield, /* complain_on_overflow */
111 bfd_elf_generic_reloc, /* special_function */
112 "R_XGATE_32", /* name */
113 false, /* partial_inplace */
114 0xffffffff, /* src_mask */
115 0xffffffff, /* dst_mask */
116 false), /* pcrel_offset */
117
118 /* A 16 bit PC-rel relocation. */
119 HOWTO (R_XGATE_PCREL_16, /* type */
120 0, /* rightshift */
121 2, /* size */
122 16, /* bitsize */
123 true, /* pc_relative */
124 0, /* bitpos */
125 complain_overflow_dont, /* complain_on_overflow */
126 bfd_elf_generic_reloc, /* special_function */
127 "R_XGATE_PCREL_16", /* name */
128 false, /* partial_inplace */
129 0xffff, /* src_mask */
130 0xffff, /* dst_mask */
131 true), /* pcrel_offset */
132
133 /* GNU extension to record C++ vtable hierarchy. */
134 HOWTO (R_XGATE_GNU_VTINHERIT, /* type */
135 0, /* rightshift */
136 2, /* size */
137 0, /* bitsize */
138 false, /* pc_relative */
139 0, /* bitpos */
140 complain_overflow_dont, /* complain_on_overflow */
141 NULL, /* special_function */
142 "R_XGATE_GNU_VTINHERIT", /* name */
143 false, /* partial_inplace */
144 0, /* src_mask */
145 0, /* dst_mask */
146 false), /* pcrel_offset */
147
148 /* GNU extension to record C++ vtable member usage. */
149 HOWTO (R_XGATE_GNU_VTENTRY, /* type */
150 0, /* rightshift */
151 2, /* size */
152 0, /* bitsize */
153 false, /* pc_relative */
154 0, /* bitpos */
155 complain_overflow_dont, /* complain_on_overflow */
156 _bfd_elf_rel_vtable_reloc_fn, /* special_function */
157 "R_XGATE_GNU_VTENTRY", /* name */
158 false, /* partial_inplace */
159 0, /* src_mask */
160 0, /* dst_mask */
161 false), /* pcrel_offset */
162
163 /* A 24 bit relocation. */
164 HOWTO (R_XGATE_24, /* type */
165 0, /* rightshift */
166 2, /* size */
167 16, /* bitsize */
168 false, /* pc_relative */
169 0, /* bitpos */
170 complain_overflow_dont, /* complain_on_overflow */
171 bfd_elf_generic_reloc, /* special_function */
172 "R_XGATE_IMM8_LO", /* name */
173 false, /* partial_inplace */
174 0x00ff, /* src_mask */
175 0x00ff, /* dst_mask */
176 false), /* pcrel_offset */
177
178 /* A 16-bit low relocation. */
179 HOWTO (R_XGATE_LO16, /* type */
180 8, /* rightshift */
181 2, /* size */
182 16, /* bitsize */
183 false, /* pc_relative */
184 0, /* bitpos */
185 complain_overflow_dont, /* complain_on_overflow */
186 bfd_elf_generic_reloc, /* special_function */
187 "R_XGATE_IMM8_HI", /* name */
188 false, /* partial_inplace */
189 0x00ff, /* src_mask */
190 0x00ff, /* dst_mask */
191 false), /* pcrel_offset */
192
193 /* A page relocation. */
194 HOWTO (R_XGATE_GPAGE, /* type */
195 0, /* rightshift */
196 1, /* size */
197 8, /* bitsize */
198 false, /* pc_relative */
199 0, /* bitpos */
200 complain_overflow_dont, /* complain_on_overflow */
201 xgate_elf_special_reloc,/* special_function */
202 "R_XGATE_GPAGE", /* name */
203 false, /* partial_inplace */
204 0x00ff, /* src_mask */
205 0x00ff, /* dst_mask */
206 false), /* pcrel_offset */
207
208 /* A 9 bit absolute relocation. */
209 HOWTO (R_XGATE_PCREL_9, /* type */
210 0, /* rightshift */
211 2, /* size */
212 9, /* bitsize */
213 true, /* pc_relative */
214 0, /* bitpos */
215 complain_overflow_bitfield, /* complain_on_overflow */
216 bfd_elf_generic_reloc, /* special_function */
217 "R_XGATE_PCREL_9", /* name */
218 false, /* partial_inplace */
219 0xffff, /* src_mask */
220 0xffff, /* dst_mask */
221 true), /* pcrel_offset */
222
223 /* A 8 bit absolute relocation (upper address). */
224 HOWTO (R_XGATE_PCREL_10, /* type */
225 8, /* rightshift */
226 1, /* size */
227 10, /* bitsize */
228 true, /* pc_relative */
229 0, /* bitpos */
230 complain_overflow_dont, /* complain_on_overflow */
231 bfd_elf_generic_reloc, /* special_function */
232 "R_XGATE_PCREL_10", /* name */
233 false, /* partial_inplace */
234 0x00ff, /* src_mask */
235 0x00ff, /* dst_mask */
236 true), /* pcrel_offset */
237
238 /* A 8 bit absolute relocation. */
239 HOWTO (R_XGATE_IMM8_LO, /* type */
240 0, /* rightshift */
241 2, /* size */
242 16, /* bitsize */
243 false, /* pc_relative */
244 0, /* bitpos */
245 complain_overflow_dont, /* complain_on_overflow */
246 bfd_elf_generic_reloc, /* special_function */
247 "R_XGATE_IMM8_LO", /* name */
248 false, /* partial_inplace */
249 0xffff, /* src_mask */
250 0xffff, /* dst_mask */
251 false), /* pcrel_offset */
252
253 /* A 16 bit absolute relocation (upper address). */
254 HOWTO (R_XGATE_IMM8_HI, /* type */
255 8, /* rightshift */
256 2, /* size */
257 16, /* bitsize */
258 false, /* pc_relative */
259 0, /* bitpos */
260 complain_overflow_dont, /* complain_on_overflow */
261 bfd_elf_generic_reloc, /* special_function */
262 "R_XGATE_IMM8_HI", /* name */
263 false, /* partial_inplace */
264 0x00ff, /* src_mask */
265 0x00ff, /* dst_mask */
266 false), /* pcrel_offset */
267
268 /* A 3 bit absolute relocation. */
269 HOWTO (R_XGATE_IMM3, /* type */
270 8, /* rightshift */
271 2, /* size */
272 16, /* bitsize */
273 false, /* pc_relative */
274 0, /* bitpos */
275 complain_overflow_dont, /* complain_on_overflow */
276 bfd_elf_generic_reloc, /* special_function */
277 "R_XGATE_IMM3", /* name */
278 false, /* partial_inplace */
279 0x00ff, /* src_mask */
280 0x00ff, /* dst_mask */
281 false), /* pcrel_offset */
282
283 /* A 4 bit absolute relocation. */
284 HOWTO (R_XGATE_IMM4, /* type */
285 8, /* rightshift */
286 2, /* size */
287 16, /* bitsize */
288 false, /* pc_relative */
289 0, /* bitpos */
290 complain_overflow_dont, /* complain_on_overflow */
291 bfd_elf_generic_reloc, /* special_function */
292 "R_XGATE_IMM4", /* name */
293 false, /* partial_inplace */
294 0x00ff, /* src_mask */
295 0x00ff, /* dst_mask */
296 false), /* pcrel_offset */
297
298 /* A 5 bit absolute relocation. */
299 HOWTO (R_XGATE_IMM5, /* type */
300 8, /* rightshift */
301 2, /* size */
302 16, /* bitsize */
303 false, /* pc_relative */
304 0, /* bitpos */
305 complain_overflow_dont, /* complain_on_overflow */
306 bfd_elf_generic_reloc, /* special_function */
307 "R_XGATE_IMM5", /* name */
308 false, /* partial_inplace */
309 0x00ff, /* src_mask */
310 0x00ff, /* dst_mask */
311 false), /* pcrel_offset */
312
313 /* Mark beginning of a jump instruction (any form). */
314 HOWTO (R_XGATE_RL_JUMP, /* type */
315 0, /* rightshift */
316 2, /* size */
317 0, /* bitsize */
318 false, /* pc_relative */
319 0, /* bitpos */
320 complain_overflow_dont, /* complain_on_overflow */
321 xgate_elf_ignore_reloc, /* special_function */
322 "R_XGATE_RL_JUMP", /* name */
323 true, /* partial_inplace */
324 0, /* src_mask */
325 0, /* dst_mask */
326 true), /* pcrel_offset */
327
328 /* Mark beginning of Gcc relaxation group instruction. */
329 HOWTO (R_XGATE_RL_GROUP, /* type */
330 0, /* rightshift */
331 2, /* size */
332 0, /* bitsize */
333 false, /* pc_relative */
334 0, /* bitpos */
335 complain_overflow_dont, /* complain_on_overflow */
336 xgate_elf_ignore_reloc, /* special_function */
337 "R_XGATE_RL_GROUP", /* name */
338 true, /* partial_inplace */
339 0, /* src_mask */
340 0, /* dst_mask */
341 true), /* pcrel_offset */
342 };
343
344 /* Map BFD reloc types to XGATE ELF reloc types. */
345
346 struct xgate_reloc_map
347 {
348 bfd_reloc_code_real_type bfd_reloc_val;
349 unsigned char elf_reloc_val;
350 };
351
352 static const struct xgate_reloc_map xgate_reloc_map[] =
353 {
354 {BFD_RELOC_NONE, R_XGATE_NONE},
355 {BFD_RELOC_8, R_XGATE_8},
356 {BFD_RELOC_8_PCREL, R_XGATE_PCREL_8},
357 {BFD_RELOC_16_PCREL, R_XGATE_PCREL_16},
358 {BFD_RELOC_16, R_XGATE_16},
359 {BFD_RELOC_32, R_XGATE_32},
360
361 {BFD_RELOC_VTABLE_INHERIT, R_XGATE_GNU_VTINHERIT},
362 {BFD_RELOC_VTABLE_ENTRY, R_XGATE_GNU_VTENTRY},
363
364 {BFD_RELOC_XGATE_LO16, R_XGATE_LO16},
365 {BFD_RELOC_XGATE_GPAGE, R_XGATE_GPAGE},
366 {BFD_RELOC_XGATE_24, R_XGATE_24},
367 {BFD_RELOC_XGATE_PCREL_9, R_XGATE_PCREL_9},
368 {BFD_RELOC_XGATE_PCREL_10, R_XGATE_PCREL_10},
369 {BFD_RELOC_XGATE_IMM8_LO, R_XGATE_IMM8_LO},
370 {BFD_RELOC_XGATE_IMM8_HI, R_XGATE_IMM8_HI},
371 {BFD_RELOC_XGATE_IMM3, R_XGATE_IMM3},
372 {BFD_RELOC_XGATE_IMM4, R_XGATE_IMM4},
373 {BFD_RELOC_XGATE_IMM5, R_XGATE_IMM5},
374
375 {BFD_RELOC_XGATE_RL_JUMP, R_XGATE_RL_JUMP},
376 {BFD_RELOC_XGATE_RL_GROUP, R_XGATE_RL_GROUP},
377 };
378
379 static reloc_howto_type *
380 bfd_elf32_bfd_reloc_type_lookup (bfd *abfd ATTRIBUTE_UNUSED,
381 bfd_reloc_code_real_type code)
382 {
383 unsigned int i;
384
385 for (i = 0; i < ARRAY_SIZE (xgate_reloc_map); i++)
386 if (xgate_reloc_map[i].bfd_reloc_val == code)
387 return &elf_xgate_howto_table[xgate_reloc_map[i].elf_reloc_val];
388
389 return NULL;
390 }
391
392 static reloc_howto_type *
393 bfd_elf32_bfd_reloc_name_lookup (bfd *abfd ATTRIBUTE_UNUSED, const char *r_name)
394 {
395 unsigned int i;
396
397 for (i = 0; i < ARRAY_SIZE (elf_xgate_howto_table); i++)
398 if (elf_xgate_howto_table[i].name != NULL
399 && strcasecmp (elf_xgate_howto_table[i].name, r_name) == 0)
400 return &elf_xgate_howto_table[i];
401
402 return NULL;
403 }
404
405 /* Set the howto pointer for an XGATE ELF reloc. */
406
407 static bool
408 xgate_info_to_howto_rel (bfd *abfd,
409 arelent *cache_ptr,
410 Elf_Internal_Rela *dst)
411 {
412 unsigned int r_type;
413
414 r_type = ELF32_R_TYPE (dst->r_info);
415 if (r_type >= (unsigned int) R_XGATE_max)
416 {
417 /* xgettext:c-format */
418 _bfd_error_handler (_("%pB: unsupported relocation type %#x"),
419 abfd, r_type);
420 bfd_set_error (bfd_error_bad_value);
421 return false;
422 }
423 cache_ptr->howto = &elf_xgate_howto_table[r_type];
424 return true;
425 }
426
427 /* Specific sections:
428 - The .page0 is a data section that is mapped in [0x0000..0x00FF].
429 Page0 accesses are faster on the M68HC12.
430 - The .vectors is the section that represents the interrupt
431 vectors.
432 - The .xgate section is starts in 0xE08800 or as xgate sees it 0x0800. */
433 static const struct bfd_elf_special_section elf32_xgate_special_sections[] =
434 {
435 { STRING_COMMA_LEN (".eeprom"), 0, SHT_PROGBITS, SHF_ALLOC + SHF_WRITE },
436 { STRING_COMMA_LEN (".page0"), 0, SHT_PROGBITS, SHF_ALLOC + SHF_WRITE },
437 { STRING_COMMA_LEN (".softregs"), 0, SHT_NOBITS, SHF_ALLOC + SHF_WRITE },
438 { STRING_COMMA_LEN (".vectors"), 0, SHT_PROGBITS, SHF_ALLOC },
439 /*{ STRING_COMMA_LEN (".xgate"), 0, SHT_PROGBITS, SHF_ALLOC + SHF_WRITE },
440 TODO finish this implementation */
441 { NULL, 0, 0, 0, 0 }
442 };
443
444 /* Hook called when reading symbols. */
445
446 static void
447 elf32_xgate_backend_symbol_processing (bfd *abfd ATTRIBUTE_UNUSED,
448 asymbol *sym)
449 {
450 /* Mark xgate symbols. */
451 ((elf_symbol_type *) sym)->internal_elf_sym.st_target_internal = 1;
452 }
453
454 /* This function is used for relocs which are only used for relaxing,
455 which the linker should otherwise ignore. */
456
457 static bfd_reloc_status_type
458 xgate_elf_ignore_reloc (bfd *abfd ATTRIBUTE_UNUSED,
459 arelent *reloc_entry,
460 asymbol *symbol ATTRIBUTE_UNUSED,
461 void *data ATTRIBUTE_UNUSED,
462 asection *input_section,
463 bfd *output_bfd,
464 char **error_message ATTRIBUTE_UNUSED)
465 {
466 if (output_bfd != NULL)
467 reloc_entry->address += input_section->output_offset;
468 return bfd_reloc_ok;
469 }
470
471 static bfd_reloc_status_type
472 xgate_elf_special_reloc (bfd *abfd ATTRIBUTE_UNUSED,
473 arelent *reloc_entry ATTRIBUTE_UNUSED,
474 asymbol *symbol ATTRIBUTE_UNUSED,
475 void *data ATTRIBUTE_UNUSED,
476 asection *input_section ATTRIBUTE_UNUSED,
477 bfd *output_bfd ATTRIBUTE_UNUSED,
478 char **error_message ATTRIBUTE_UNUSED)
479 {
480 abort ();
481 }
482
483 static bool
484 _bfd_xgate_elf_print_private_bfd_data (bfd *abfd, void *ptr)
485 {
486 FILE *file = (FILE *) ptr;
487
488 BFD_ASSERT (abfd != NULL && ptr != NULL);
489
490 /* Print normal ELF private data. */
491 _bfd_elf_print_private_bfd_data (abfd, ptr);
492
493 /* xgettext:c-format */
494 fprintf (file, _("private flags = %lx:"), elf_elfheader (abfd)->e_flags);
495
496 if (elf_elfheader (abfd)->e_flags & E_XGATE_I32)
497 fprintf (file, _("[abi=32-bit int, "));
498 else
499 fprintf (file, _("[abi=16-bit int, "));
500
501 if (elf_elfheader (abfd)->e_flags & E_XGATE_F64)
502 fprintf (file, _("64-bit double, "));
503 else
504 fprintf (file, _("32-bit double, "));
505 if (elf_elfheader (abfd)->e_flags & EF_XGATE_MACH)
506 fprintf (file, _("cpu=XGATE]"));
507 else
508 fprintf (file, _("error reading cpu type from elf private data"));
509 fputc ('\n', file);
510
511 return true;
512 }
513
514 #define ELF_ARCH bfd_arch_xgate
515 #define ELF_MACHINE_CODE EM_XGATE
516
517 #define ELF_MAXPAGESIZE 0x1000
518
519 #define TARGET_BIG_SYM xgate_elf32_vec
520 #define TARGET_BIG_NAME "elf32-xgate"
521
522 #define elf_info_to_howto_rel xgate_info_to_howto_rel
523 #define elf_backend_special_sections elf32_xgate_special_sections
524 #define elf_backend_symbol_processing elf32_xgate_backend_symbol_processing
525 #define bfd_elf32_bfd_print_private_bfd_data _bfd_xgate_elf_print_private_bfd_data
526
527 #include "elf32-target.h"