1 /* BFD back-end for Motorola MCore COFF/PE
2 Copyright (C) 1999-2017 Free Software Foundation, Inc.
4 This file is part of BFD, the Binary File Descriptor library.
6 This program is free software; you can redistribute it and/or modify
7 it under the terms of the GNU General Public License as published by
8 the Free Software Foundation; either version 3 of the License, or
9 (at your option) any later version.
11 This program is distributed in the hope that it will be useful,
12 but WITHOUT ANY WARRANTY; without even the implied warranty of
13 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
14 GNU General Public License for more details.
16 You should have received a copy of the GNU General Public License
17 along with this program; if not, write to the Free Software
18 Foundation, 51 Franklin Street - Fifth Floor,
19 Boston, MA 02110-1301, USA. */
24 #include "coff/mcore.h"
25 #include "coff/internal.h"
32 #define BADMAG(x) MCOREBADMAG(x)
35 #define NUM_ELEM(A) (sizeof (A) / sizeof (A)[0])
38 /* This file is compiled more than once, but we only compile the
39 final_link routine once. */
40 extern bfd_boolean mcore_bfd_coff_final_link
41 (bfd *, struct bfd_link_info *);
42 static bfd_reloc_status_type mcore_coff_unsupported_reloc
43 (bfd *, arelent *, asymbol *, void *, asection *, bfd *, char **);
46 /* The NT loader points the toc register to &toc + 32768, in order to
47 use the complete range of a 16-bit displacement. We have to adjust
48 for this when we fix up loads displaced off the toc reg. */
49 #define TOC_LOAD_ADJUSTMENT (-32768)
50 #define TOC_SECTION_NAME ".private.toc"
52 /* The main body of code is in coffcode.h. */
53 #define COFF_DEFAULT_SECTION_ALIGNMENT_POWER 2
55 /* In case we're on a 32-bit machine, construct a 64-bit "-1" value
56 from smaller values. Start with zero, widen, *then* decrement. */
57 #define MINUS_ONE (((bfd_vma)0) - 1)
59 static reloc_howto_type mcore_coff_howto_table[] =
62 HOWTO (IMAGE_REL_MCORE_ABSOLUTE,/* type */
64 0, /* size (0 = byte, 1 = short, 2 = long) */
66 FALSE, /* pc_relative */
68 complain_overflow_dont, /* dont complain_on_overflow */
69 NULL, /* special_function */
70 "ABSOLUTE", /* name */
71 FALSE, /* partial_inplace */
74 FALSE), /* pcrel_offset */
76 HOWTO (IMAGE_REL_MCORE_ADDR32,/* type */
78 2, /* size (0 = byte, 1 = short, 2 = long) */
80 FALSE, /* pc_relative */
82 complain_overflow_bitfield, /* complain_on_overflow */
83 NULL, /* special_function */
85 TRUE, /* partial_inplace */
86 0xffffffff, /* src_mask */
87 0xffffffff, /* dst_mask */
88 FALSE), /* pcrel_offset */
90 /* 8 bits + 2 zero bits; jmpi/jsri/lrw instructions.
91 Should not appear in object files. */
92 HOWTO (IMAGE_REL_MCORE_PCREL_IMM8BY4, /* type */
94 1, /* size (0 = byte, 1 = short, 2 = long) */
96 TRUE, /* pc_relative */
98 complain_overflow_bitfield, /* complain_on_overflow */
99 mcore_coff_unsupported_reloc, /* special_function */
100 "IMM8BY4", /* name */
101 FALSE, /* partial_inplace */
104 TRUE), /* pcrel_offset */
106 /* bsr/bt/bf/br instructions; 11 bits + 1 zero bit
107 Span 2k instructions == 4k bytes.
108 Only useful pieces at the relocated address are the opcode (5 bits) */
109 HOWTO (IMAGE_REL_MCORE_PCREL_IMM11BY2,/* type */
111 1, /* size (0 = byte, 1 = short, 2 = long) */
113 TRUE, /* pc_relative */
115 complain_overflow_signed, /* complain_on_overflow */
116 NULL, /* special_function */
117 "IMM11BY2", /* name */
118 FALSE, /* partial_inplace */
120 0x7ff, /* dst_mask */
121 TRUE), /* pcrel_offset */
123 /* 4 bits + 1 zero bit; 'loopt' instruction only; unsupported. */
124 HOWTO (IMAGE_REL_MCORE_PCREL_IMM4BY2, /* type */
126 1, /* size (0 = byte, 1 = short, 2 = long) */
128 TRUE, /* pc_relative */
130 complain_overflow_bitfield, /* complain_on_overflow */
131 mcore_coff_unsupported_reloc, /* special_function */
132 "IMM4BY2", /* name */
133 FALSE, /* partial_inplace */
136 TRUE), /* pcrel_offset */
138 /* 32-bit pc-relative. Eventually this will help support PIC code. */
139 HOWTO (IMAGE_REL_MCORE_PCREL_32,/* type */
141 2, /* size (0 = byte, 1 = short, 2 = long) */
143 TRUE, /* pc_relative */
145 complain_overflow_bitfield, /* complain_on_overflow */
146 NULL, /* special_function */
147 "PCREL_32", /* name */
148 FALSE, /* partial_inplace */
150 0xffffffff, /* dst_mask */
151 TRUE), /* pcrel_offset */
153 /* Like PCREL_IMM11BY2, this relocation indicates that there is a
154 'jsri' at the specified address. There is a separate relocation
155 entry for the literal pool entry that it references, but we
156 might be able to change the jsri to a bsr if the target turns out
157 to be close enough [even though we won't reclaim the literal pool
158 entry, we'll get some runtime efficiency back]. Note that this
159 is a relocation that we are allowed to safely ignore. */
160 HOWTO (IMAGE_REL_MCORE_PCREL_JSR_IMM11BY2,/* type */
162 1, /* size (0 = byte, 1 = short, 2 = long) */
164 TRUE, /* pc_relative */
166 complain_overflow_signed, /* complain_on_overflow */
167 NULL, /* special_function */
168 "JSR_IMM11BY2", /* name */
169 FALSE, /* partial_inplace */
171 0x7ff, /* dst_mask */
172 TRUE), /* pcrel_offset */
174 HOWTO (IMAGE_REL_MCORE_RVA, /* type */
176 2, /* size (0 = byte, 1 = short, 2 = long) */
178 FALSE, /* pc_relative */
180 complain_overflow_signed, /* complain_on_overflow */
181 NULL, /* special_function */
182 "MCORE_RVA", /* name */
183 TRUE, /* partial_inplace */
184 0xffffffff, /* src_mask */
185 0xffffffff, /* dst_mask */
186 TRUE) /* pcrel_offset */
189 /* Extend the coff_link_hash_table structure with a few M*Core specific fields.
190 This allows us to store global data here without actually creating any
191 global variables, which is a no-no in the BFD world. */
192 typedef struct coff_mcore_link_hash_table
194 /* The original coff_link_hash_table structure. MUST be first field. */
195 struct coff_link_hash_table root;
197 bfd * bfd_of_toc_owner;
198 long int global_toc_size;
199 long int import_table_size;
200 long int first_thunk_address;
205 /* Get the MCore coff linker hash table from a link_info structure. */
206 #define coff_mcore_hash_table(info) \
207 ((mcore_hash_table *) ((info)->hash))
210 /* Add an entry to the base file. */
213 mcore_emit_base_file_entry (struct bfd_link_info *info,
215 asection *input_section,
216 bfd_vma reloc_offset)
218 bfd_vma addr = reloc_offset
220 + input_section->output_offset
221 + input_section->output_section->vma;
223 if (coff_data (output_bfd)->pe)
224 addr -= pe_data (output_bfd)->pe_opthdr.ImageBase;
226 if (fwrite (&addr, sizeof (addr), 1, (FILE *) info->base_file) == 1)
229 bfd_set_error (bfd_error_system_call);
233 static bfd_reloc_status_type
234 mcore_coff_unsupported_reloc (bfd * abfd,
235 arelent * reloc_entry,
236 asymbol * symbol ATTRIBUTE_UNUSED,
237 void * data ATTRIBUTE_UNUSED,
238 asection * input_section ATTRIBUTE_UNUSED,
239 bfd * output_bfd ATTRIBUTE_UNUSED,
240 char ** error_message ATTRIBUTE_UNUSED)
242 BFD_ASSERT (reloc_entry->howto != (reloc_howto_type *)0);
244 /* xgettext: c-format */
245 _bfd_error_handler (_("%B: Relocation %s (%d) is not currently supported.\n"),
247 reloc_entry->howto->name,
248 reloc_entry->howto->type);
250 return bfd_reloc_notsupported;
253 /* A cheesy little macro to make the code a little more readable. */
254 #define HOW2MAP(bfd_rtype, mcore_rtype) \
255 case bfd_rtype: return & mcore_coff_howto_table [mcore_rtype]
257 static reloc_howto_type *
258 mcore_coff_reloc_type_lookup (bfd * abfd ATTRIBUTE_UNUSED,
259 bfd_reloc_code_real_type code)
263 HOW2MAP (BFD_RELOC_32, IMAGE_REL_MCORE_ADDR32);
264 HOW2MAP (BFD_RELOC_MCORE_PCREL_IMM8BY4, IMAGE_REL_MCORE_PCREL_IMM8BY4);
265 HOW2MAP (BFD_RELOC_MCORE_PCREL_IMM11BY2, IMAGE_REL_MCORE_PCREL_IMM11BY2);
266 HOW2MAP (BFD_RELOC_MCORE_PCREL_IMM4BY2, IMAGE_REL_MCORE_PCREL_IMM4BY2);
267 HOW2MAP (BFD_RELOC_32_PCREL, IMAGE_REL_MCORE_PCREL_32);
268 HOW2MAP (BFD_RELOC_MCORE_PCREL_JSR_IMM11BY2, IMAGE_REL_MCORE_PCREL_JSR_IMM11BY2);
269 HOW2MAP (BFD_RELOC_RVA, IMAGE_REL_MCORE_RVA);
277 #define NUM_HOWTOS NUM_ELEM (mcore_coff_howto_table)
279 static reloc_howto_type *
280 mcore_coff_reloc_name_lookup (bfd *abfd ATTRIBUTE_UNUSED,
285 for (i = 0; i < NUM_HOWTOS; i++)
286 if (mcore_coff_howto_table[i].name != NULL
287 && strcasecmp (mcore_coff_howto_table[i].name, r_name) == 0)
288 return &mcore_coff_howto_table[i];
293 #define RTYPE2HOWTO(cache_ptr, dst) \
294 ((cache_ptr)->howto = \
295 ((dst)->r_type < NUM_HOWTOS \
296 ? mcore_coff_howto_table + (dst)->r_type \
299 static reloc_howto_type *
300 coff_mcore_rtype_to_howto (bfd * abfd ATTRIBUTE_UNUSED,
302 struct internal_reloc * rel,
303 struct coff_link_hash_entry * h ATTRIBUTE_UNUSED,
304 struct internal_syment * sym,
307 reloc_howto_type * howto;
309 if (rel->r_type >= NUM_HOWTOS)
312 howto = mcore_coff_howto_table + rel->r_type;
314 if (rel->r_type == IMAGE_REL_MCORE_RVA)
315 * addendp -= pe_data (sec->output_section->owner)->pe_opthdr.ImageBase;
317 else if (howto->pc_relative)
319 * addendp = sec->vma - 2; /* XXX guess - is this right ? */
321 /* If the symbol is defined, then the generic code is going to
322 add back the symbol value in order to cancel out an
323 adjustment it made to the addend. However, we set the addend
324 to 0 at the start of this function. We need to adjust here,
325 to avoid the adjustment the generic code will make. FIXME:
326 This is getting a bit hackish. */
327 if (sym != NULL && sym->n_scnum != 0)
328 * addendp -= sym->n_value;
336 /* Return TRUE if this relocation should appear in the output .reloc section.
337 This function is referenced in pe_mkobject in peicode.h. */
340 in_reloc_p (bfd * abfd ATTRIBUTE_UNUSED, reloc_howto_type * howto)
342 return ! howto->pc_relative && howto->type != IMAGE_REL_MCORE_RVA;
345 /* The reloc processing routine for the optimized COFF linker. */
347 coff_mcore_relocate_section (bfd * output_bfd,
348 struct bfd_link_info * info,
350 asection * input_section,
352 struct internal_reloc * relocs,
353 struct internal_syment * syms,
354 asection ** sections)
356 struct internal_reloc * rel;
357 struct internal_reloc * relend;
359 /* If we are performing a relocatable link, we don't need to do a
360 thing. The caller will take care of adjusting the reloc
361 addresses and symbol indices. */
362 if (bfd_link_relocatable (info))
365 /* Check if we have the same endianness */
366 if ( input_bfd->xvec->byteorder != output_bfd->xvec->byteorder
367 && output_bfd->xvec->byteorder != BFD_ENDIAN_UNKNOWN)
370 /* xgettext: c-format */
371 (_("%B: compiled for a %s system and target is %s.\n"),
373 bfd_big_endian (input_bfd) ? _("big endian") : _("little endian"),
374 bfd_big_endian (output_bfd) ? _("big endian") : _("little endian"));
376 bfd_set_error (bfd_error_wrong_format);
381 relend = rel + input_section->reloc_count;
383 for (; rel < relend; rel++)
386 struct internal_syment * sym;
389 bfd_reloc_status_type rstat;
391 unsigned short r_type = rel->r_type;
392 reloc_howto_type * howto = NULL;
393 struct coff_link_hash_entry * h;
394 const char * my_name;
396 symndx = rel->r_symndx;
397 loc = contents + rel->r_vaddr - input_section->vma;
406 h = obj_coff_sym_hashes (input_bfd)[symndx];
412 /* Get the howto and initialise the addend. */
413 howto = bfd_coff_rtype_to_howto (input_bfd, input_section, rel, h,
426 asection * sec = sections[symndx];
429 + sec->output_section->vma
430 + sec->output_offset);
433 my_name = "*unknown*";
434 else if ( sym->_n._n_n._n_zeroes == 0
435 && sym->_n._n_n._n_offset != 0)
436 my_name = obj_coff_strings (input_bfd) + sym->_n._n_n._n_offset;
439 static char buf [SYMNMLEN + 1];
441 strncpy (buf, sym->_n._n_name, SYMNMLEN);
442 buf[SYMNMLEN] = '\0';
449 if ( h->root.type == bfd_link_hash_defined
450 || h->root.type == bfd_link_hash_defweak)
452 asection * sec = h->root.u.def.section;
454 val = (h->root.u.def.value
455 + sec->output_section->vma
456 + sec->output_offset);
459 (*info->callbacks->undefined_symbol)
460 (info, h->root.root.string, input_bfd, input_section,
461 rel->r_vaddr - input_section->vma, TRUE);
463 my_name = h->root.root.string;
466 rstat = bfd_reloc_ok;
468 /* Each case must do its own relocation, setting rstat appropriately. */
472 /* xgettext: c-format */
473 _bfd_error_handler (_("%B: unsupported relocation type 0x%02x"),
475 bfd_set_error (bfd_error_bad_value);
478 case IMAGE_REL_MCORE_ABSOLUTE:
480 /* xgettext: c-format */
481 (_("Warning: unsupported reloc %s <file %B, section %A>\n"
482 "sym %ld (%s), r_vaddr %ld (%lx)"),
483 input_bfd, input_section, howto->name,
484 rel->r_symndx, my_name, (long) rel->r_vaddr,
485 (unsigned long) rel->r_vaddr);
488 case IMAGE_REL_MCORE_PCREL_IMM8BY4:
489 case IMAGE_REL_MCORE_PCREL_IMM11BY2:
490 case IMAGE_REL_MCORE_PCREL_IMM4BY2:
491 case IMAGE_REL_MCORE_PCREL_32:
492 case IMAGE_REL_MCORE_PCREL_JSR_IMM11BY2:
493 case IMAGE_REL_MCORE_ADDR32:
494 /* XXX fixme - shouldn't this be like the code for the RVA reloc ? */
495 rstat = _bfd_relocate_contents (howto, input_bfd, val, loc);
498 case IMAGE_REL_MCORE_RVA:
499 rstat = _bfd_final_link_relocate
501 input_section, contents, rel->r_vaddr - input_section->vma,
506 /* Emit a reloc if the backend thinks it needs it. */
509 && pe_data (output_bfd)->in_reloc_p (output_bfd, howto)
510 && !mcore_emit_base_file_entry (info, output_bfd, input_section,
522 case bfd_reloc_overflow:
523 (*info->callbacks->reloc_overflow)
524 (info, (h ? &h->root : NULL), my_name, howto->name,
525 (bfd_vma) 0, input_bfd,
526 input_section, rel->r_vaddr - input_section->vma);
533 /* Tailor coffcode.h -- macro heaven. */
535 /* We use the special COFF backend linker, with our own special touch. */
537 #define coff_bfd_reloc_type_lookup mcore_coff_reloc_type_lookup
538 #define coff_bfd_reloc_name_lookup mcore_coff_reloc_name_lookup
539 #define coff_relocate_section coff_mcore_relocate_section
540 #define coff_rtype_to_howto coff_mcore_rtype_to_howto
542 #define SELECT_RELOC(internal, howto) {internal.r_type = howto->type;}
544 /* Make sure that the 'r_offset' field is copied properly
545 so that identical binaries will compare the same. */
546 #define SWAP_IN_RELOC_OFFSET H_GET_32
547 #define SWAP_OUT_RELOC_OFFSET H_PUT_32
549 #define COFF_PAGE_SIZE 0x1000
551 #include "coffcode.h"
553 /* Forward declaration to initialise alternative_target field. */
554 extern const bfd_target TARGET_LITTLE_SYM;
556 /* The transfer vectors that lead the outside world to all of the above. */
557 CREATE_BIG_COFF_TARGET_VEC (TARGET_BIG_SYM, TARGET_BIG_NAME, D_PAGED,
558 (SEC_CODE | SEC_DATA | SEC_DEBUGGING | SEC_READONLY | SEC_LINK_ONCE | SEC_LINK_DUPLICATES),
559 0, & TARGET_LITTLE_SYM, COFF_SWAP_TABLE)
560 CREATE_LITTLE_COFF_TARGET_VEC (TARGET_LITTLE_SYM, TARGET_LITTLE_NAME, D_PAGED,
561 (SEC_CODE | SEC_DATA | SEC_DEBUGGING | SEC_READONLY | SEC_LINK_ONCE | SEC_LINK_DUPLICATES),
562 0, & TARGET_BIG_SYM, COFF_SWAP_TABLE)