1 /* BFD back-end for Motorola MCore COFF/PE
2 Copyright 1999, 2000, 2001, 2002, 2003 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 2 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, 59 Temple Place - Suite 330,
19 Boston, MA 02111-1307, 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 PARAMS ((bfd *, struct bfd_link_info *));
43 static struct bfd_link_hash_table *coff_mcore_link_hash_table_create
46 static bfd_reloc_status_type mcore_coff_unsupported_reloc
47 PARAMS ((bfd *, arelent *, asymbol *, PTR, asection *, bfd *, char **));
48 static bfd_boolean coff_mcore_relocate_section
49 PARAMS ((bfd *, struct bfd_link_info *, bfd *, asection *, bfd_byte *,
50 struct internal_reloc *, struct internal_syment *, asection **));
51 static reloc_howto_type *mcore_coff_reloc_type_lookup
52 PARAMS ((bfd *, bfd_reloc_code_real_type));
53 static reloc_howto_type *coff_mcore_rtype_to_howto
54 PARAMS ((bfd *, asection *, struct internal_reloc *,
55 struct coff_link_hash_entry *, struct internal_syment *,
57 static void mcore_emit_base_file_entry
58 PARAMS ((struct bfd_link_info *, bfd *, asection *, bfd_vma));
59 static bfd_boolean in_reloc_p PARAMS ((bfd *, reloc_howto_type *));
61 /* The NT loader points the toc register to &toc + 32768, in order to
62 use the complete range of a 16-bit displacement. We have to adjust
63 for this when we fix up loads displaced off the toc reg. */
64 #define TOC_LOAD_ADJUSTMENT (-32768)
65 #define TOC_SECTION_NAME ".private.toc"
67 /* The main body of code is in coffcode.h. */
68 #define COFF_DEFAULT_SECTION_ALIGNMENT_POWER 2
70 /* In case we're on a 32-bit machine, construct a 64-bit "-1" value
71 from smaller values. Start with zero, widen, *then* decrement. */
72 #define MINUS_ONE (((bfd_vma)0) - 1)
74 static reloc_howto_type mcore_coff_howto_table[] =
77 HOWTO (IMAGE_REL_MCORE_ABSOLUTE,/* type */
79 0, /* size (0 = byte, 1 = short, 2 = long) */
81 FALSE, /* pc_relative */
83 complain_overflow_dont, /* dont complain_on_overflow */
84 NULL, /* special_function */
85 "ABSOLUTE", /* name */
86 FALSE, /* partial_inplace */
89 FALSE), /* pcrel_offset */
91 HOWTO (IMAGE_REL_MCORE_ADDR32,/* type */
93 2, /* size (0 = byte, 1 = short, 2 = long) */
95 FALSE, /* pc_relative */
97 complain_overflow_bitfield, /* complain_on_overflow */
98 NULL, /* special_function */
100 TRUE, /* partial_inplace */
101 0xffffffff, /* src_mask */
102 0xffffffff, /* dst_mask */
103 FALSE), /* pcrel_offset */
105 /* 8 bits + 2 zero bits; jmpi/jsri/lrw instructions.
106 Should not appear in object files. */
107 HOWTO (IMAGE_REL_MCORE_PCREL_IMM8BY4, /* type */
109 1, /* size (0 = byte, 1 = short, 2 = long) */
111 TRUE, /* pc_relative */
113 complain_overflow_bitfield, /* complain_on_overflow */
114 mcore_coff_unsupported_reloc, /* special_function */
115 "IMM8BY4", /* name */
116 FALSE, /* partial_inplace */
119 TRUE), /* pcrel_offset */
121 /* bsr/bt/bf/br instructions; 11 bits + 1 zero bit
122 Span 2k instructions == 4k bytes.
123 Only useful pieces at the relocated address are the opcode (5 bits) */
124 HOWTO (IMAGE_REL_MCORE_PCREL_IMM11BY2,/* type */
126 1, /* size (0 = byte, 1 = short, 2 = long) */
128 TRUE, /* pc_relative */
130 complain_overflow_signed, /* complain_on_overflow */
131 NULL, /* special_function */
132 "IMM11BY2", /* name */
133 FALSE, /* partial_inplace */
135 0x7ff, /* dst_mask */
136 TRUE), /* pcrel_offset */
138 /* 4 bits + 1 zero bit; 'loopt' instruction only; unsupported. */
139 HOWTO (IMAGE_REL_MCORE_PCREL_IMM4BY2, /* type */
141 1, /* size (0 = byte, 1 = short, 2 = long) */
143 TRUE, /* pc_relative */
145 complain_overflow_bitfield, /* complain_on_overflow */
146 mcore_coff_unsupported_reloc, /* special_function */
147 "IMM4BY2", /* name */
148 FALSE, /* partial_inplace */
151 TRUE), /* pcrel_offset */
153 /* 32-bit pc-relative. Eventually this will help support PIC code. */
154 HOWTO (IMAGE_REL_MCORE_PCREL_32,/* type */
156 2, /* size (0 = byte, 1 = short, 2 = long) */
158 TRUE, /* pc_relative */
160 complain_overflow_bitfield, /* complain_on_overflow */
161 NULL, /* special_function */
162 "PCREL_32", /* name */
163 FALSE, /* partial_inplace */
165 0xffffffff, /* dst_mask */
166 TRUE), /* pcrel_offset */
168 /* Like PCREL_IMM11BY2, this relocation indicates that there is a
169 'jsri' at the specified address. There is a separate relocation
170 entry for the literal pool entry that it references, but we
171 might be able to change the jsri to a bsr if the target turns out
172 to be close enough [even though we won't reclaim the literal pool
173 entry, we'll get some runtime efficiency back]. Note that this
174 is a relocation that we are allowed to safely ignore. */
175 HOWTO (IMAGE_REL_MCORE_PCREL_JSR_IMM11BY2,/* type */
177 1, /* size (0 = byte, 1 = short, 2 = long) */
179 TRUE, /* pc_relative */
181 complain_overflow_signed, /* complain_on_overflow */
182 NULL, /* special_function */
183 "JSR_IMM11BY2", /* name */
184 FALSE, /* partial_inplace */
186 0x7ff, /* dst_mask */
187 TRUE), /* pcrel_offset */
189 HOWTO (IMAGE_REL_MCORE_RVA, /* type */
191 2, /* size (0 = byte, 1 = short, 2 = long) */
193 FALSE, /* pc_relative */
195 complain_overflow_signed, /* complain_on_overflow */
196 NULL, /* special_function */
197 "MCORE_RVA", /* name */
198 TRUE, /* partial_inplace */
199 0xffffffff, /* src_mask */
200 0xffffffff, /* dst_mask */
201 TRUE) /* pcrel_offset */
204 /* Extend the coff_link_hash_table structure with a few M*Core specific fields.
205 This allows us to store global data here without actually creating any
206 global variables, which is a no-no in the BFD world. */
207 typedef struct coff_mcore_link_hash_table
209 /* The original coff_link_hash_table structure. MUST be first field. */
210 struct coff_link_hash_table root;
212 bfd * bfd_of_toc_owner;
213 long int global_toc_size;
214 long int import_table_size;
215 long int first_thunk_address;
220 /* Get the MCore coff linker hash table from a link_info structure. */
221 #define coff_mcore_hash_table(info) \
222 ((mcore_hash_table *) ((info)->hash))
225 /* Create an MCore coff linker hash table. */
227 static struct bfd_link_hash_table *
228 coff_mcore_link_hash_table_create (abfd)
231 mcore_hash_table * ret;
233 ret = (mcore_hash_table *) bfd_malloc ((bfd_size_type) sizeof (* ret));
234 if (ret == (mcore_hash_table *) NULL)
237 if (! _bfd_coff_link_hash_table_init
238 (& ret->root, abfd, _bfd_coff_link_hash_newfunc))
241 return (struct bfd_link_hash_table *) NULL;
244 ret->bfd_of_toc_owner = NULL;
245 ret->global_toc_size = 0;
246 ret->import_table_size = 0;
247 ret->first_thunk_address = 0;
250 return & ret->root.root;
254 /* Add an entry to the base file. */
257 mcore_emit_base_file_entry (info, output_bfd, input_section, reloc_offset)
258 struct bfd_link_info * info;
260 asection * input_section;
261 bfd_vma reloc_offset;
263 bfd_vma addr = reloc_offset
265 + input_section->output_offset
266 + input_section->output_section->vma;
268 if (coff_data (output_bfd)->pe)
269 addr -= pe_data (output_bfd)->pe_opthdr.ImageBase;
271 fwrite (&addr, 1, sizeof (addr), (FILE *) info->base_file);
274 static bfd_reloc_status_type
275 mcore_coff_unsupported_reloc (abfd, reloc_entry, symbol, data, input_section,
276 output_bfd, error_message)
278 arelent * reloc_entry;
279 asymbol * symbol ATTRIBUTE_UNUSED;
280 PTR data ATTRIBUTE_UNUSED;
281 asection * input_section ATTRIBUTE_UNUSED;
282 bfd * output_bfd ATTRIBUTE_UNUSED;
283 char ** error_message ATTRIBUTE_UNUSED;
285 BFD_ASSERT (reloc_entry->howto != (reloc_howto_type *)0);
287 _bfd_error_handler (_("%s: Relocation %s (%d) is not currently supported.\n"),
288 bfd_archive_filename (abfd),
289 reloc_entry->howto->name,
290 reloc_entry->howto->type);
292 return bfd_reloc_notsupported;
295 /* A cheesy little macro to make the code a little more readable. */
296 #define HOW2MAP(bfd_rtype, mcore_rtype) \
297 case bfd_rtype: return & mcore_coff_howto_table [mcore_rtype]
299 static reloc_howto_type *
300 mcore_coff_reloc_type_lookup (abfd, code)
301 bfd * abfd ATTRIBUTE_UNUSED;
302 bfd_reloc_code_real_type code;
306 HOW2MAP (BFD_RELOC_32, IMAGE_REL_MCORE_ADDR32);
307 HOW2MAP (BFD_RELOC_MCORE_PCREL_IMM8BY4, IMAGE_REL_MCORE_PCREL_IMM8BY4);
308 HOW2MAP (BFD_RELOC_MCORE_PCREL_IMM11BY2, IMAGE_REL_MCORE_PCREL_IMM11BY2);
309 HOW2MAP (BFD_RELOC_MCORE_PCREL_IMM4BY2, IMAGE_REL_MCORE_PCREL_IMM4BY2);
310 HOW2MAP (BFD_RELOC_32_PCREL, IMAGE_REL_MCORE_PCREL_32);
311 HOW2MAP (BFD_RELOC_MCORE_PCREL_JSR_IMM11BY2, IMAGE_REL_MCORE_PCREL_JSR_IMM11BY2);
312 HOW2MAP (BFD_RELOC_RVA, IMAGE_REL_MCORE_RVA);
321 #define RTYPE2HOWTO(cache_ptr, dst) \
322 (cache_ptr)->howto = mcore_coff_howto_table + (dst)->r_type;
324 static reloc_howto_type *
325 coff_mcore_rtype_to_howto (abfd, sec, rel, h, sym, addendp)
326 bfd * abfd ATTRIBUTE_UNUSED;
328 struct internal_reloc * rel;
329 struct coff_link_hash_entry * h ATTRIBUTE_UNUSED;
330 struct internal_syment * sym;
333 reloc_howto_type * howto;
335 if (rel->r_type >= NUM_ELEM (mcore_coff_howto_table))
338 howto = mcore_coff_howto_table + rel->r_type;
340 if (rel->r_type == IMAGE_REL_MCORE_RVA)
341 * addendp -= pe_data (sec->output_section->owner)->pe_opthdr.ImageBase;
343 else if (howto->pc_relative)
345 * addendp = sec->vma - 2; /* XXX guess - is this right ? */
347 /* If the symbol is defined, then the generic code is going to
348 add back the symbol value in order to cancel out an
349 adjustment it made to the addend. However, we set the addend
350 to 0 at the start of this function. We need to adjust here,
351 to avoid the adjustment the generic code will make. FIXME:
352 This is getting a bit hackish. */
353 if (sym != NULL && sym->n_scnum != 0)
354 * addendp -= sym->n_value;
362 /* Return TRUE if this relocation should appear in the output .reloc section.
363 This function is referenced in pe_mkobject in peicode.h. */
366 in_reloc_p (abfd, howto)
367 bfd * abfd ATTRIBUTE_UNUSED;
368 reloc_howto_type * howto;
370 return ! howto->pc_relative && howto->type != IMAGE_REL_MCORE_RVA;
373 /* The reloc processing routine for the optimized COFF linker. */
375 coff_mcore_relocate_section (output_bfd, info, input_bfd, input_section,
376 contents, relocs, syms, sections)
378 struct bfd_link_info * info;
380 asection * input_section;
382 struct internal_reloc * relocs;
383 struct internal_syment * syms;
384 asection ** sections;
386 struct internal_reloc * rel;
387 struct internal_reloc * relend;
391 /* If we are performing a relocatable link, we don't need to do a
392 thing. The caller will take care of adjusting the reloc
393 addresses and symbol indices. */
394 if (info->relocatable)
397 /* Check if we have the same endianess */
398 if ( input_bfd->xvec->byteorder != output_bfd->xvec->byteorder
399 && output_bfd->xvec->byteorder != BFD_ENDIAN_UNKNOWN)
401 (*_bfd_error_handler)
402 (_("%s: compiled for a %s system and target is %s.\n"),
403 bfd_archive_filename (input_bfd),
404 bfd_big_endian (input_bfd) ? _("big endian") : _("little endian"),
405 bfd_big_endian (output_bfd) ? _("big endian") : _("little endian"));
407 bfd_set_error (bfd_error_wrong_format);
415 relend = rel + input_section->reloc_count;
417 for (; rel < relend; rel++)
420 struct internal_syment * sym;
423 bfd_reloc_status_type rstat;
425 unsigned short r_type = rel->r_type;
426 reloc_howto_type * howto = NULL;
427 struct coff_link_hash_entry * h;
428 const char * my_name;
430 symndx = rel->r_symndx;
431 loc = contents + rel->r_vaddr - input_section->vma;
440 h = obj_coff_sym_hashes (input_bfd)[symndx];
446 /* Get the howto and initialise the addend. */
447 howto = bfd_coff_rtype_to_howto (input_bfd, input_section, rel, h,
460 asection * sec = sections[symndx];
463 + sec->output_section->vma
464 + sec->output_offset);
467 my_name = "*unknown*";
468 else if ( sym->_n._n_n._n_zeroes == 0
469 && sym->_n._n_n._n_offset != 0)
470 my_name = obj_coff_strings (input_bfd) + sym->_n._n_n._n_offset;
473 static char buf [SYMNMLEN + 1];
475 strncpy (buf, sym->_n._n_name, SYMNMLEN);
476 buf[SYMNMLEN] = '\0';
483 if ( h->root.type == bfd_link_hash_defined
484 || h->root.type == bfd_link_hash_defweak)
486 asection * sec = h->root.u.def.section;
488 val = (h->root.u.def.value
489 + sec->output_section->vma
490 + sec->output_offset);
494 if (! ((*info->callbacks->undefined_symbol)
495 (info, h->root.root.string, input_bfd, input_section,
496 rel->r_vaddr - input_section->vma, TRUE)))
500 my_name = h->root.root.string;
503 rstat = bfd_reloc_ok;
505 /* Each case must do its own relocation, setting rstat appropriately. */
509 _bfd_error_handler (_("%s: unsupported relocation type 0x%02x"),
510 bfd_archive_filename (input_bfd), r_type);
511 bfd_set_error (bfd_error_bad_value);
514 case IMAGE_REL_MCORE_ABSOLUTE:
516 _("Warning: unsupported reloc %s <file %s, section %s>\n"),
518 bfd_archive_filename (input_bfd),
519 input_section->name);
521 fprintf (stderr,"sym %ld (%s), r_vaddr %ld (%lx)\n",
522 rel->r_symndx, my_name, (long) rel->r_vaddr,
523 (unsigned long) rel->r_vaddr);
526 case IMAGE_REL_MCORE_PCREL_IMM8BY4:
527 case IMAGE_REL_MCORE_PCREL_IMM11BY2:
528 case IMAGE_REL_MCORE_PCREL_IMM4BY2:
529 case IMAGE_REL_MCORE_PCREL_32:
530 case IMAGE_REL_MCORE_PCREL_JSR_IMM11BY2:
531 case IMAGE_REL_MCORE_ADDR32:
532 /* XXX fixme - shouldn't this be like the code for the RVA reloc ? */
533 rstat = _bfd_relocate_contents (howto, input_bfd, val, loc);
536 case IMAGE_REL_MCORE_RVA:
537 rstat = _bfd_final_link_relocate
539 input_section, contents, rel->r_vaddr - input_section->vma,
546 /* Emit a reloc if the backend thinks it needs it. */
547 if (sym && pe_data (output_bfd)->in_reloc_p (output_bfd, howto))
548 mcore_emit_base_file_entry (info, output_bfd, input_section, rel->r_vaddr);
559 case bfd_reloc_overflow:
560 if (! ((*info->callbacks->reloc_overflow)
561 (info, my_name, howto->name,
562 (bfd_vma) 0, input_bfd,
563 input_section, rel->r_vaddr - input_section->vma)))
571 /* Tailor coffcode.h -- macro heaven. */
573 /* We use the special COFF backend linker, with our own special touch. */
575 #define coff_bfd_reloc_type_lookup mcore_coff_reloc_type_lookup
576 #define coff_relocate_section coff_mcore_relocate_section
577 #define coff_rtype_to_howto coff_mcore_rtype_to_howto
579 #define SELECT_RELOC(internal, howto) {internal.r_type = howto->type;}
581 /* Make sure that the 'r_offset' field is copied properly
582 so that identical binaries will compare the same. */
583 #define SWAP_IN_RELOC_OFFSET H_GET_32
584 #define SWAP_OUT_RELOC_OFFSET H_PUT_32
586 #define COFF_PAGE_SIZE 0x1000
588 #include "coffcode.h"
590 /* Forward declaration to initialise alterbative_target field. */
591 extern const bfd_target TARGET_LITTLE_SYM;
593 /* The transfer vectors that lead the outside world to all of the above. */
594 CREATE_BIG_COFF_TARGET_VEC (TARGET_BIG_SYM, TARGET_BIG_NAME, D_PAGED,
595 (SEC_CODE | SEC_DATA | SEC_DEBUGGING | SEC_READONLY | SEC_LINK_ONCE | SEC_LINK_DUPLICATES),
596 0, & TARGET_LITTLE_SYM, COFF_SWAP_TABLE)
597 CREATE_LITTLE_COFF_TARGET_VEC (TARGET_LITTLE_SYM, TARGET_LITTLE_NAME, D_PAGED,
598 (SEC_CODE | SEC_DATA | SEC_DEBUGGING | SEC_READONLY | SEC_LINK_ONCE | SEC_LINK_DUPLICATES),
599 0, & TARGET_BIG_SYM, COFF_SWAP_TABLE)