Do not allow symbols to be created in the absolute section.
[binutils.git] / bfd / coff-mcore.c
blobf15102dff1c882ad637abb8e4b310500708a2e26
1 /* BFD back-end for Motorola MCore COFF/PE
2 Copyright 1999, 2000, 2001, 2002 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. */
21 #include "bfd.h"
22 #include "sysdep.h"
23 #include "libbfd.h"
24 #include "coff/mcore.h"
25 #include "coff/internal.h"
26 #include "coff/pe.h"
27 #include "libcoff.h"
29 #ifdef BADMAG
30 #undef BADMAG
31 #endif
32 #define BADMAG(x) MCOREBADMAG(x)
34 #ifndef NUM_ELEM
35 #define NUM_ELEM(A) (sizeof (A) / sizeof (A)[0])
36 #endif
38 /* This file is compiled more than once, but we only compile the
39 final_link routine once. */
40 extern boolean mcore_bfd_coff_final_link
41 PARAMS ((bfd *, struct bfd_link_info *));
42 #if 0
43 static struct bfd_link_hash_table * coff_mcore_link_hash_table_create
44 PARAMS ((bfd *));
45 #endif
46 static bfd_reloc_status_type mcore_coff_unsupported_reloc
47 PARAMS ((bfd *, arelent *, asymbol *, PTR, asection *, bfd *, char **));
48 static 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 *, bfd_vma *));
56 static void mcore_emit_base_file_entry
57 PARAMS ((struct bfd_link_info *, bfd *, asection *, bfd_vma));
58 static boolean in_reloc_p PARAMS ((bfd *, reloc_howto_type *));
60 /* The NT loader points the toc register to &toc + 32768, in order to
61 use the complete range of a 16-bit displacement. We have to adjust
62 for this when we fix up loads displaced off the toc reg. */
63 #define TOC_LOAD_ADJUSTMENT (-32768)
64 #define TOC_SECTION_NAME ".private.toc"
66 /* The main body of code is in coffcode.h. */
67 #define COFF_DEFAULT_SECTION_ALIGNMENT_POWER 2
69 /* In case we're on a 32-bit machine, construct a 64-bit "-1" value
70 from smaller values. Start with zero, widen, *then* decrement. */
71 #define MINUS_ONE (((bfd_vma)0) - 1)
73 static reloc_howto_type mcore_coff_howto_table[] =
75 /* Unused: */
76 HOWTO (IMAGE_REL_MCORE_ABSOLUTE,/* type */
77 0, /* rightshift */
78 0, /* size (0 = byte, 1 = short, 2 = long) */
79 0, /* bitsize */
80 false, /* pc_relative */
81 0, /* bitpos */
82 complain_overflow_dont, /* dont complain_on_overflow */
83 NULL, /* special_function */
84 "ABSOLUTE", /* name */
85 false, /* partial_inplace */
86 0x00, /* src_mask */
87 0x00, /* dst_mask */
88 false), /* pcrel_offset */
90 HOWTO (IMAGE_REL_MCORE_ADDR32,/* type */
91 0, /* rightshift */
92 2, /* size (0 = byte, 1 = short, 2 = long) */
93 32, /* bitsize */
94 false, /* pc_relative */
95 0, /* bitpos */
96 complain_overflow_bitfield, /* complain_on_overflow */
97 NULL, /* special_function */
98 "ADDR32", /* name */
99 true, /* partial_inplace */
100 0xffffffff, /* src_mask */
101 0xffffffff, /* dst_mask */
102 false), /* pcrel_offset */
104 /* 8 bits + 2 zero bits; jmpi/jsri/lrw instructions.
105 Should not appear in object files. */
106 HOWTO (IMAGE_REL_MCORE_PCREL_IMM8BY4, /* type */
107 2, /* rightshift */
108 1, /* size (0 = byte, 1 = short, 2 = long) */
109 8, /* bitsize */
110 true, /* pc_relative */
111 0, /* bitpos */
112 complain_overflow_bitfield, /* complain_on_overflow */
113 mcore_coff_unsupported_reloc, /* special_function */
114 "IMM8BY4", /* name */
115 false, /* partial_inplace */
116 0, /* src_mask */
117 0, /* dst_mask */
118 true), /* pcrel_offset */
120 /* bsr/bt/bf/br instructions; 11 bits + 1 zero bit
121 Span 2k instructions == 4k bytes.
122 Only useful pieces at the relocated address are the opcode (5 bits) */
123 HOWTO (IMAGE_REL_MCORE_PCREL_IMM11BY2,/* type */
124 1, /* rightshift */
125 1, /* size (0 = byte, 1 = short, 2 = long) */
126 11, /* bitsize */
127 true, /* pc_relative */
128 0, /* bitpos */
129 complain_overflow_signed, /* complain_on_overflow */
130 NULL, /* special_function */
131 "IMM11BY2", /* name */
132 false, /* partial_inplace */
133 0x0, /* src_mask */
134 0x7ff, /* dst_mask */
135 true), /* pcrel_offset */
137 /* 4 bits + 1 zero bit; 'loopt' instruction only; unsupported. */
138 HOWTO (IMAGE_REL_MCORE_PCREL_IMM4BY2, /* type */
139 1, /* rightshift */
140 1, /* size (0 = byte, 1 = short, 2 = long) */
141 4, /* bitsize */
142 true, /* pc_relative */
143 0, /* bitpos */
144 complain_overflow_bitfield, /* complain_on_overflow */
145 mcore_coff_unsupported_reloc, /* special_function */
146 "IMM4BY2", /* name */
147 false, /* partial_inplace */
148 0, /* src_mask */
149 0, /* dst_mask */
150 true), /* pcrel_offset */
152 /* 32-bit pc-relative. Eventually this will help support PIC code. */
153 HOWTO (IMAGE_REL_MCORE_PCREL_32,/* type */
154 0, /* rightshift */
155 2, /* size (0 = byte, 1 = short, 2 = long) */
156 32, /* bitsize */
157 true, /* pc_relative */
158 0, /* bitpos */
159 complain_overflow_bitfield, /* complain_on_overflow */
160 NULL, /* special_function */
161 "PCREL_32", /* name */
162 false, /* partial_inplace */
163 0x0, /* src_mask */
164 0xffffffff, /* dst_mask */
165 true), /* pcrel_offset */
167 /* Like PCREL_IMM11BY2, this relocation indicates that there is a
168 'jsri' at the specified address. There is a separate relocation
169 entry for the literal pool entry that it references, but we
170 might be able to change the jsri to a bsr if the target turns out
171 to be close enough [even though we won't reclaim the literal pool
172 entry, we'll get some runtime efficiency back]. Note that this
173 is a relocation that we are allowed to safely ignore. */
174 HOWTO (IMAGE_REL_MCORE_PCREL_JSR_IMM11BY2,/* type */
175 1, /* rightshift */
176 1, /* size (0 = byte, 1 = short, 2 = long) */
177 11, /* bitsize */
178 true, /* pc_relative */
179 0, /* bitpos */
180 complain_overflow_signed, /* complain_on_overflow */
181 NULL, /* special_function */
182 "JSR_IMM11BY2", /* name */
183 false, /* partial_inplace */
184 0x0, /* src_mask */
185 0x7ff, /* dst_mask */
186 true), /* pcrel_offset */
188 HOWTO (IMAGE_REL_MCORE_RVA, /* type */
189 0, /* rightshift */
190 2, /* size (0 = byte, 1 = short, 2 = long) */
191 32, /* bitsize */
192 false, /* pc_relative */
193 0, /* bitpos */
194 complain_overflow_signed, /* complain_on_overflow */
195 NULL, /* special_function */
196 "MCORE_RVA", /* name */
197 true, /* partial_inplace */
198 0xffffffff, /* src_mask */
199 0xffffffff, /* dst_mask */
200 true) /* pcrel_offset */
203 /* Extend the coff_link_hash_table structure with a few M*Core specific fields.
204 This allows us to store global data here without actually creating any
205 global variables, which is a no-no in the BFD world. */
206 typedef struct coff_mcore_link_hash_table
208 /* The original coff_link_hash_table structure. MUST be first field. */
209 struct coff_link_hash_table root;
211 bfd * bfd_of_toc_owner;
212 long int global_toc_size;
213 long int import_table_size;
214 long int first_thunk_address;
215 long int thunk_size;
217 mcore_hash_table;
219 /* Get the MCore coff linker hash table from a link_info structure. */
220 #define coff_mcore_hash_table(info) \
221 ((mcore_hash_table *) ((info)->hash))
223 #if 0
224 /* Create an MCore coff linker hash table. */
226 static struct bfd_link_hash_table *
227 coff_mcore_link_hash_table_create (abfd)
228 bfd * abfd;
230 mcore_hash_table * ret;
232 ret = (mcore_hash_table *) bfd_malloc ((bfd_size_type) sizeof (* ret));
233 if (ret == (mcore_hash_table *) NULL)
234 return NULL;
236 if (! _bfd_coff_link_hash_table_init
237 (& ret->root, abfd, _bfd_coff_link_hash_newfunc))
239 free (ret);
240 return (struct bfd_link_hash_table *) NULL;
243 ret->bfd_of_toc_owner = NULL;
244 ret->global_toc_size = 0;
245 ret->import_table_size = 0;
246 ret->first_thunk_address = 0;
247 ret->thunk_size = 0;
249 return & ret->root.root;
251 #endif
253 /* Add an entry to the base file. */
255 static void
256 mcore_emit_base_file_entry (info, output_bfd, input_section, reloc_offset)
257 struct bfd_link_info * info;
258 bfd * output_bfd;
259 asection * input_section;
260 bfd_vma reloc_offset;
262 bfd_vma addr = reloc_offset
263 - input_section->vma
264 + input_section->output_offset
265 + input_section->output_section->vma;
267 if (coff_data (output_bfd)->pe)
268 addr -= pe_data (output_bfd)->pe_opthdr.ImageBase;
270 fwrite (&addr, 1, sizeof (addr), (FILE *) info->base_file);
273 static bfd_reloc_status_type
274 mcore_coff_unsupported_reloc (abfd, reloc_entry, symbol, data, input_section,
275 output_bfd, error_message)
276 bfd * abfd;
277 arelent * reloc_entry;
278 asymbol * symbol ATTRIBUTE_UNUSED;
279 PTR data ATTRIBUTE_UNUSED;
280 asection * input_section ATTRIBUTE_UNUSED;
281 bfd * output_bfd ATTRIBUTE_UNUSED;
282 char ** error_message ATTRIBUTE_UNUSED;
284 BFD_ASSERT (reloc_entry->howto != (reloc_howto_type *)0);
286 _bfd_error_handler (_("%s: Relocation %s (%d) is not currently supported.\n"),
287 bfd_archive_filename (abfd),
288 reloc_entry->howto->name,
289 reloc_entry->howto->type);
291 return bfd_reloc_notsupported;
294 /* A cheesy little macro to make the code a little more readable. */
295 #define HOW2MAP(bfd_rtype, mcore_rtype) \
296 case bfd_rtype: return & mcore_coff_howto_table [mcore_rtype]
298 static reloc_howto_type *
299 mcore_coff_reloc_type_lookup (abfd, code)
300 bfd * abfd ATTRIBUTE_UNUSED;
301 bfd_reloc_code_real_type code;
303 switch (code)
305 HOW2MAP (BFD_RELOC_32, IMAGE_REL_MCORE_ADDR32);
306 HOW2MAP (BFD_RELOC_MCORE_PCREL_IMM8BY4, IMAGE_REL_MCORE_PCREL_IMM8BY4);
307 HOW2MAP (BFD_RELOC_MCORE_PCREL_IMM11BY2, IMAGE_REL_MCORE_PCREL_IMM11BY2);
308 HOW2MAP (BFD_RELOC_MCORE_PCREL_IMM4BY2, IMAGE_REL_MCORE_PCREL_IMM4BY2);
309 HOW2MAP (BFD_RELOC_32_PCREL, IMAGE_REL_MCORE_PCREL_32);
310 HOW2MAP (BFD_RELOC_MCORE_PCREL_JSR_IMM11BY2, IMAGE_REL_MCORE_PCREL_JSR_IMM11BY2);
311 HOW2MAP (BFD_RELOC_RVA, IMAGE_REL_MCORE_RVA);
312 default:
313 return NULL;
315 /*NOTREACHED*/
318 #undef HOW2MAP
320 #define RTYPE2HOWTO(cache_ptr, dst) \
321 (cache_ptr)->howto = mcore_coff_howto_table + (dst)->r_type;
323 static reloc_howto_type *
324 coff_mcore_rtype_to_howto (abfd, sec, rel, h, sym, addendp)
325 bfd * abfd ATTRIBUTE_UNUSED;
326 asection * sec;
327 struct internal_reloc * rel;
328 struct coff_link_hash_entry * h ATTRIBUTE_UNUSED;
329 struct internal_syment * sym;
330 bfd_vma * addendp;
332 reloc_howto_type * howto;
334 if (rel->r_type >= NUM_ELEM (mcore_coff_howto_table))
335 return NULL;
337 howto = mcore_coff_howto_table + rel->r_type;
339 if (rel->r_type == IMAGE_REL_MCORE_RVA)
340 * addendp -= pe_data (sec->output_section->owner)->pe_opthdr.ImageBase;
342 else if (howto->pc_relative)
344 * addendp = sec->vma - 2; /* XXX guess - is this right ? */
346 /* If the symbol is defined, then the generic code is going to
347 add back the symbol value in order to cancel out an
348 adjustment it made to the addend. However, we set the addend
349 to 0 at the start of this function. We need to adjust here,
350 to avoid the adjustment the generic code will make. FIXME:
351 This is getting a bit hackish. */
352 if (sym != NULL && sym->n_scnum != 0)
353 * addendp -= sym->n_value;
355 else
356 * addendp = 0;
358 return howto;
361 /* Return true if this relocation should appear in the output .reloc section.
362 This function is referenced in pe_mkobject in peicode.h. */
364 static boolean
365 in_reloc_p (abfd, howto)
366 bfd * abfd ATTRIBUTE_UNUSED;
367 reloc_howto_type * howto;
369 return ! howto->pc_relative && howto->type != IMAGE_REL_MCORE_RVA;
372 /* The reloc processing routine for the optimized COFF linker. */
373 static boolean
374 coff_mcore_relocate_section (output_bfd, info, input_bfd, input_section,
375 contents, relocs, syms, sections)
376 bfd * output_bfd;
377 struct bfd_link_info * info;
378 bfd * input_bfd;
379 asection * input_section;
380 bfd_byte * contents;
381 struct internal_reloc * relocs;
382 struct internal_syment * syms;
383 asection ** sections;
385 struct internal_reloc * rel;
386 struct internal_reloc * relend;
387 boolean hihalf;
388 bfd_vma hihalf_val;
390 /* If we are performing a relocateable link, we don't need to do a
391 thing. The caller will take care of adjusting the reloc
392 addresses and symbol indices. */
393 if (info->relocateable)
394 return true;
396 /* Check if we have the same endianess */
397 if ( input_bfd->xvec->byteorder != output_bfd->xvec->byteorder
398 && output_bfd->xvec->byteorder != BFD_ENDIAN_UNKNOWN)
400 (*_bfd_error_handler)
401 (_("%s: compiled for a %s system and target is %s.\n"),
402 bfd_archive_filename (input_bfd),
403 bfd_big_endian (input_bfd) ? _("big endian") : _("little endian"),
404 bfd_big_endian (output_bfd) ? _("big endian") : _("little endian"));
406 bfd_set_error (bfd_error_wrong_format);
407 return false;
410 hihalf = false;
411 hihalf_val = 0;
413 rel = relocs;
414 relend = rel + input_section->reloc_count;
416 for (; rel < relend; rel++)
418 long symndx;
419 struct internal_syment * sym;
420 bfd_vma val;
421 bfd_vma addend;
422 bfd_reloc_status_type rstat;
423 bfd_byte * loc;
424 unsigned short r_type = rel->r_type;
425 reloc_howto_type * howto = NULL;
426 struct coff_link_hash_entry * h;
427 const char * my_name;
429 symndx = rel->r_symndx;
430 loc = contents + rel->r_vaddr - input_section->vma;
432 if (symndx == -1)
434 h = NULL;
435 sym = NULL;
437 else
439 h = obj_coff_sym_hashes (input_bfd)[symndx];
440 sym = syms + symndx;
443 addend = 0;
445 /* Get the howto and initialise the addend. */
446 howto = bfd_coff_rtype_to_howto (input_bfd, input_section, rel, h,
447 sym, & addend);
448 if (howto == NULL)
449 return false;
451 val = 0;
453 if (h == NULL)
455 if (symndx == -1)
456 my_name = "*ABS*";
457 else
459 asection * sec = sections[symndx];
461 val = (sym->n_value
462 + sec->output_section->vma
463 + sec->output_offset);
465 if (sym == NULL)
466 my_name = "*unknown*";
467 else if ( sym->_n._n_n._n_zeroes == 0
468 && sym->_n._n_n._n_offset != 0)
469 my_name = obj_coff_strings (input_bfd) + sym->_n._n_n._n_offset;
470 else
472 static char buf [SYMNMLEN + 1];
474 strncpy (buf, sym->_n._n_name, SYMNMLEN);
475 buf[SYMNMLEN] = '\0';
476 my_name = buf;
480 else
482 if ( h->root.type == bfd_link_hash_defined
483 || h->root.type == bfd_link_hash_defweak)
485 asection * sec = h->root.u.def.section;
487 val = (h->root.u.def.value
488 + sec->output_section->vma
489 + sec->output_offset);
491 else
493 if (! ((*info->callbacks->undefined_symbol)
494 (info, h->root.root.string, input_bfd, input_section,
495 rel->r_vaddr - input_section->vma, true)))
496 return false;
499 my_name = h->root.root.string;
502 rstat = bfd_reloc_ok;
504 /* Each case must do its own relocation, setting rstat appropriately. */
505 switch (r_type)
507 default:
508 _bfd_error_handler (_("%s: unsupported relocation type 0x%02x"),
509 bfd_archive_filename (input_bfd), r_type);
510 bfd_set_error (bfd_error_bad_value);
511 return false;
513 case IMAGE_REL_MCORE_ABSOLUTE:
514 fprintf (stderr,
515 _("Warning: unsupported reloc %s <file %s, section %s>\n"),
516 howto->name,
517 bfd_archive_filename (input_bfd),
518 input_section->name);
520 fprintf (stderr,"sym %ld (%s), r_vaddr %ld (%lx)\n",
521 rel->r_symndx, my_name, (long) rel->r_vaddr,
522 (unsigned long) rel->r_vaddr);
523 break;
525 case IMAGE_REL_MCORE_PCREL_IMM8BY4:
526 case IMAGE_REL_MCORE_PCREL_IMM11BY2:
527 case IMAGE_REL_MCORE_PCREL_IMM4BY2:
528 case IMAGE_REL_MCORE_PCREL_32:
529 case IMAGE_REL_MCORE_PCREL_JSR_IMM11BY2:
530 case IMAGE_REL_MCORE_ADDR32:
531 /* XXX fixme - shouldn't this be like the code for the RVA reloc ? */
532 rstat = _bfd_relocate_contents (howto, input_bfd, val, loc);
533 break;
535 case IMAGE_REL_MCORE_RVA:
536 rstat = _bfd_final_link_relocate
537 (howto, input_bfd,
538 input_section, contents, rel->r_vaddr - input_section->vma,
539 val, addend);
540 break;
543 if (info->base_file)
545 /* Emit a reloc if the backend thinks it needs it. */
546 if (sym && pe_data (output_bfd)->in_reloc_p (output_bfd, howto))
547 mcore_emit_base_file_entry (info, output_bfd, input_section, rel->r_vaddr);
550 switch (rstat)
552 default:
553 abort ();
555 case bfd_reloc_ok:
556 break;
558 case bfd_reloc_overflow:
559 if (! ((*info->callbacks->reloc_overflow)
560 (info, my_name, howto->name,
561 (bfd_vma) 0, input_bfd,
562 input_section, rel->r_vaddr - input_section->vma)))
563 return false;
567 return true;
570 /* Tailor coffcode.h -- macro heaven. */
572 /* We use the special COFF backend linker, with our own special touch. */
574 #define coff_bfd_reloc_type_lookup mcore_coff_reloc_type_lookup
575 #define coff_relocate_section coff_mcore_relocate_section
576 #define coff_rtype_to_howto coff_mcore_rtype_to_howto
578 #define SELECT_RELOC(internal, howto) {internal.r_type = howto->type;}
580 #define COFF_PAGE_SIZE 0x1000
582 #include "coffcode.h"
584 /* Forward declaration to initialise alterbative_target field. */
585 extern const bfd_target TARGET_LITTLE_SYM;
587 /* The transfer vectors that lead the outside world to all of the above. */
588 CREATE_BIG_COFF_TARGET_VEC (TARGET_BIG_SYM, TARGET_BIG_NAME, D_PAGED,
589 (SEC_CODE | SEC_DATA | SEC_DEBUGGING | SEC_READONLY | SEC_LINK_ONCE | SEC_LINK_DUPLICATES),
590 0, & TARGET_LITTLE_SYM)
591 CREATE_LITTLE_COFF_TARGET_VEC (TARGET_LITTLE_SYM, TARGET_LITTLE_NAME, D_PAGED,
592 (SEC_CODE | SEC_DATA | SEC_DEBUGGING | SEC_READONLY | SEC_LINK_ONCE | SEC_LINK_DUPLICATES),
593 0, & TARGET_BIG_SYM)