1 /* BFD backend for MIPS BSD (a.out) binaries.
2 Copyright 1993, 1994, 1995, 1997, 1998, 1999, 2000, 2001, 2002, 2003
3 Free Software Foundation, Inc.
4 Written by Ralph Campbell.
5
6 This file is part of BFD, the Binary File Descriptor library.
7
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.
12
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.
17
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
20 Foundation, Inc., 51 Franklin Street - Fifth Floor, Boston, MA 02110-1301, USA. */
21
22 /* #define ENTRY_CAN_BE_ZERO */
23 #define N_HEADER_IN_TEXT(x) 1
24 #define N_SHARED_LIB(x) 0
25 #define N_TXTADDR(x) \
26 (N_MAGIC(x) != ZMAGIC ? (x).a_entry : /* object file or NMAGIC */\
27 TEXT_START_ADDR + EXEC_BYTES_SIZE /* no padding */\
28 )
29 #define N_DATADDR(x) (N_TXTADDR(x)+N_TXTSIZE(x))
30 #define TEXT_START_ADDR 4096
31 #define TARGET_PAGE_SIZE 4096
32 #define SEGMENT_SIZE TARGET_PAGE_SIZE
33 #define DEFAULT_ARCH bfd_arch_mips
34 #define MACHTYPE_OK(mtype) ((mtype) == M_UNKNOWN \
35 || (mtype) == M_MIPS1 || (mtype) == M_MIPS2)
36 #define MY_symbol_leading_char '\0'
37
38 /* Do not "beautify" the CONCAT* macro args. Traditional C will not
39 remove whitespace added here, and thus will fail to concatenate
40 the tokens. */
41 #define MY(OP) CONCAT2 (mipsbsd_,OP)
42
43 #include "bfd.h"
44 #include "sysdep.h"
45 #include "libbfd.h"
46 #include "libaout.h"
47
48 #define SET_ARCH_MACH(ABFD, EXEC) \
49 MY(set_arch_mach) (ABFD, N_MACHTYPE (EXEC)); \
50 MY(choose_reloc_size) (ABFD);
51 static void MY(set_arch_mach) PARAMS ((bfd *abfd, unsigned long machtype));
52 static void MY(choose_reloc_size) PARAMS ((bfd *abfd));
53
54 #define MY_write_object_contents MY(write_object_contents)
55 static bfd_boolean MY(write_object_contents) PARAMS ((bfd *abfd));
56
57 /* We can't use MY(x) here because it leads to a recursive call to CONCAT2
58 when expanded inside JUMP_TABLE. */
59 #define MY_bfd_reloc_type_lookup mipsbsd_reloc_howto_type_lookup
60 #define MY_canonicalize_reloc mipsbsd_canonicalize_reloc
61
62 #define MY_bfd_link_hash_table_create _bfd_generic_link_hash_table_create
63 #define MY_bfd_link_add_symbols _bfd_generic_link_add_symbols
64 #define MY_final_link_callback unused
65 #define MY_bfd_final_link _bfd_generic_final_link
66
67 #define MY_backend_data &MY(backend_data)
68 #define MY_BFD_TARGET
69
70 #include "aout-target.h"
71
72 static bfd_reloc_status_type mips_fix_jmp_addr
73 PARAMS ((bfd *, arelent *, struct bfd_symbol *, PTR, asection *,
74 bfd *, char **));
75 static reloc_howto_type *MY(reloc_howto_type_lookup)
76 PARAMS ((bfd *, bfd_reloc_code_real_type));
77
78 long MY(canonicalize_reloc) PARAMS ((bfd *, sec_ptr, arelent **, asymbol **));
79
80 static void
81 MY(set_arch_mach) (abfd, machtype)
82 bfd *abfd;
83 unsigned long machtype;
84 {
85 enum bfd_architecture arch;
86 unsigned int machine;
87
88 /* Determine the architecture and machine type of the object file. */
89 switch (machtype)
90 {
91 case M_MIPS1:
92 arch = bfd_arch_mips;
93 machine = bfd_mach_mips3000;
94 break;
95
96 case M_MIPS2:
97 arch = bfd_arch_mips;
98 machine = bfd_mach_mips4000;
99 break;
100
101 default:
102 arch = bfd_arch_obscure;
103 machine = 0;
104 break;
105 }
106
107 bfd_set_arch_mach (abfd, arch, machine);
108 }
109
110 /* Determine the size of a relocation entry, based on the architecture */
111 static void
112 MY (choose_reloc_size) (abfd)
113 bfd *abfd;
114 {
115 switch (bfd_get_arch (abfd))
116 {
117 case bfd_arch_sparc:
118 case bfd_arch_mips:
119 obj_reloc_entry_size (abfd) = RELOC_EXT_SIZE;
120 break;
121 default:
122 obj_reloc_entry_size (abfd) = RELOC_STD_SIZE;
123 break;
124 }
125 }
126
127 /* Write an object file in BSD a.out format.
128 Section contents have already been written. We write the
129 file header, symbols, and relocation. */
130
131 static bfd_boolean
132 MY (write_object_contents) (abfd)
133 bfd *abfd;
134 {
135 struct external_exec exec_bytes;
136 struct internal_exec *execp = exec_hdr (abfd);
137
138 /* Magic number, maestro, please! */
139 switch (bfd_get_arch (abfd))
140 {
141 case bfd_arch_m68k:
142 switch (bfd_get_mach (abfd))
143 {
144 case bfd_mach_m68010:
145 N_SET_MACHTYPE (*execp, M_68010);
146 break;
147 default:
148 case bfd_mach_m68020:
149 N_SET_MACHTYPE (*execp, M_68020);
150 break;
151 }
152 break;
153 case bfd_arch_sparc:
154 N_SET_MACHTYPE (*execp, M_SPARC);
155 break;
156 case bfd_arch_i386:
157 N_SET_MACHTYPE (*execp, M_386);
158 break;
159 case bfd_arch_mips:
160 switch (bfd_get_mach (abfd))
161 {
162 case bfd_mach_mips4000:
163 case bfd_mach_mips6000:
164 N_SET_MACHTYPE (*execp, M_MIPS2);
165 break;
166 default:
167 N_SET_MACHTYPE (*execp, M_MIPS1);
168 break;
169 }
170 break;
171 default:
172 N_SET_MACHTYPE (*execp, M_UNKNOWN);
173 }
174
175 MY (choose_reloc_size) (abfd);
176
177 WRITE_HEADERS (abfd, execp);
178
179 return TRUE;
180 }
181
182 /* MIPS relocation types. */
183 #define MIPS_RELOC_32 0
184 #define MIPS_RELOC_JMP 1
185 #define MIPS_RELOC_WDISP16 2
186 #define MIPS_RELOC_HI16 3
187 #define MIPS_RELOC_HI16_S 4
188 #define MIPS_RELOC_LO16 5
189
190 /* This is only called when performing a BFD_RELOC_MIPS_JMP relocation.
191 The jump destination address is formed from the upper 4 bits of the
192 "current" program counter concatenated with the jump instruction's
193 26 bit field and two trailing zeros.
194 If the destination address is not in the same segment as the "current"
195 program counter, then we need to signal an error. */
196
197 static bfd_reloc_status_type
mips_fix_jmp_addr(abfd,reloc_entry,symbol,data,input_section,output_bfd,error_message)198 mips_fix_jmp_addr (abfd, reloc_entry, symbol, data, input_section, output_bfd,
199 error_message)
200 bfd *abfd ATTRIBUTE_UNUSED;
201 arelent *reloc_entry;
202 struct bfd_symbol *symbol;
203 PTR data ATTRIBUTE_UNUSED;
204 asection *input_section;
205 bfd *output_bfd;
206 char **error_message ATTRIBUTE_UNUSED;
207 {
208 bfd_vma relocation, pc;
209
210 /* If this is a partial relocation, just continue. */
211 if (output_bfd != (bfd *)NULL)
212 return bfd_reloc_continue;
213
214 /* If this is an undefined symbol, return error */
215 if (bfd_is_und_section (symbol->section)
216 && (symbol->flags & BSF_WEAK) == 0)
217 return bfd_reloc_undefined;
218
219 /* Work out which section the relocation is targeted at and the
220 initial relocation command value. */
221 if (bfd_is_com_section (symbol->section))
222 relocation = 0;
223 else
224 relocation = symbol->value;
225
226 relocation += symbol->section->output_section->vma;
227 relocation += symbol->section->output_offset;
228 relocation += reloc_entry->addend;
229
230 pc = input_section->output_section->vma + input_section->output_offset +
231 reloc_entry->address + 4;
232
233 if ((relocation & 0xF0000000) != (pc & 0xF0000000))
234 return bfd_reloc_overflow;
235
236 return bfd_reloc_continue;
237 }
238
239 /* This is only called when performing a BFD_RELOC_HI16_S relocation.
240 We need to see if bit 15 is set in the result. If it is, we add
241 0x10000 and continue normally. This will compensate for the sign extension
242 when the low bits are added at run time. */
243
244 static bfd_reloc_status_type
245 mips_fix_hi16_s PARAMS ((bfd *, arelent *, asymbol *, PTR,
246 asection *, bfd *, char **));
247
248 static bfd_reloc_status_type
mips_fix_hi16_s(abfd,reloc_entry,symbol,data,input_section,output_bfd,error_message)249 mips_fix_hi16_s (abfd, reloc_entry, symbol, data, input_section,
250 output_bfd, error_message)
251 bfd *abfd ATTRIBUTE_UNUSED;
252 arelent *reloc_entry;
253 asymbol *symbol;
254 PTR data ATTRIBUTE_UNUSED;
255 asection *input_section ATTRIBUTE_UNUSED;
256 bfd *output_bfd;
257 char **error_message ATTRIBUTE_UNUSED;
258 {
259 bfd_vma relocation;
260
261 /* If this is a partial relocation, just continue. */
262 if (output_bfd != (bfd *)NULL)
263 return bfd_reloc_continue;
264
265 /* If this is an undefined symbol, return error. */
266 if (bfd_is_und_section (symbol->section)
267 && (symbol->flags & BSF_WEAK) == 0)
268 return bfd_reloc_undefined;
269
270 /* Work out which section the relocation is targeted at and the
271 initial relocation command value. */
272 if (bfd_is_com_section (symbol->section))
273 relocation = 0;
274 else
275 relocation = symbol->value;
276
277 relocation += symbol->section->output_section->vma;
278 relocation += symbol->section->output_offset;
279 relocation += reloc_entry->addend;
280
281 if (relocation & 0x8000)
282 reloc_entry->addend += 0x10000;
283
284 return bfd_reloc_continue;
285 }
286
287 static reloc_howto_type mips_howto_table_ext[] = {
288 {MIPS_RELOC_32, 0, 2, 32, FALSE, 0, complain_overflow_bitfield, 0,
289 "32", FALSE, 0, 0xffffffff, FALSE},
290 {MIPS_RELOC_JMP, 2, 2, 26, FALSE, 0, complain_overflow_dont,
291 mips_fix_jmp_addr,
292 "MIPS_JMP", FALSE, 0, 0x03ffffff, FALSE},
293 {MIPS_RELOC_WDISP16, 2, 2, 16, TRUE, 0, complain_overflow_signed, 0,
294 "WDISP16", FALSE, 0, 0x0000ffff, FALSE},
295 {MIPS_RELOC_HI16, 16, 2, 16, FALSE, 0, complain_overflow_bitfield, 0,
296 "HI16", FALSE, 0, 0x0000ffff, FALSE},
297 {MIPS_RELOC_HI16_S, 16, 2, 16, FALSE, 0, complain_overflow_bitfield,
298 mips_fix_hi16_s,
299 "HI16_S", FALSE, 0, 0x0000ffff, FALSE},
300 {MIPS_RELOC_LO16, 0, 2, 16, FALSE, 0, complain_overflow_dont, 0,
301 "LO16", FALSE, 0, 0x0000ffff, FALSE},
302 };
303
304 static reloc_howto_type *
305 MY(reloc_howto_type_lookup) (abfd, code)
306 bfd *abfd;
307 bfd_reloc_code_real_type code;
308 {
309
310 if (bfd_get_arch (abfd) != bfd_arch_mips)
311 return 0;
312
313 switch (code)
314 {
315 case BFD_RELOC_CTOR:
316 case BFD_RELOC_32:
317 return (&mips_howto_table_ext[MIPS_RELOC_32]);
318 case BFD_RELOC_MIPS_JMP:
319 return (&mips_howto_table_ext[MIPS_RELOC_JMP]);
320 case BFD_RELOC_16_PCREL_S2:
321 return (&mips_howto_table_ext[MIPS_RELOC_WDISP16]);
322 case BFD_RELOC_HI16:
323 return (&mips_howto_table_ext[MIPS_RELOC_HI16]);
324 case BFD_RELOC_HI16_S:
325 return (&mips_howto_table_ext[MIPS_RELOC_HI16_S]);
326 case BFD_RELOC_LO16:
327 return (&mips_howto_table_ext[MIPS_RELOC_LO16]);
328 default:
329 return 0;
330 }
331 }
332
333 /* This is just like the standard aoutx.h version but we need to do our
334 own mapping of external reloc type values to howto entries. */
335 long
336 MY(canonicalize_reloc) (abfd, section, relptr, symbols)
337 bfd *abfd;
338 sec_ptr section;
339 arelent **relptr;
340 asymbol **symbols;
341 {
342 arelent *tblptr = section->relocation;
343 unsigned int count, c;
344 extern reloc_howto_type NAME(aout,ext_howto_table)[];
345
346 /* If we have already read in the relocation table, return the values. */
347 if (section->flags & SEC_CONSTRUCTOR)
348 {
349 arelent_chain *chain = section->constructor_chain;
350
351 for (count = 0; count < section->reloc_count; count++)
352 {
353 *relptr++ = &chain->relent;
354 chain = chain->next;
355 }
356 *relptr = 0;
357 return section->reloc_count;
358 }
359
360 if (tblptr && section->reloc_count)
361 {
362 for (count = 0; count++ < section->reloc_count;)
363 *relptr++ = tblptr++;
364 *relptr = 0;
365 return section->reloc_count;
366 }
367
368 if (!NAME(aout,slurp_reloc_table) (abfd, section, symbols))
369 return -1;
370 tblptr = section->relocation;
371
372 /* fix up howto entries. */
373 for (count = 0; count++ < section->reloc_count;)
374 {
375 c = tblptr->howto - NAME(aout,ext_howto_table);
376 tblptr->howto = &mips_howto_table_ext[c];
377
378 *relptr++ = tblptr++;
379 }
380 *relptr = 0;
381 return section->reloc_count;
382 }
383
384 static const struct aout_backend_data MY(backend_data) = {
385 0, /* zmagic contiguous */
386 1, /* text incl header */
387 0, /* entry is text address */
388 0, /* exec_hdr_flags */
389 TARGET_PAGE_SIZE, /* text vma */
390 MY_set_sizes,
391 0, /* text size includes exec header */
392 0, /* add_dynamic_symbols */
393 0, /* add_one_symbol */
394 0, /* link_dynamic_object */
395 0, /* write_dynamic_symbol */
396 0, /* check_dynamic_reloc */
397 0 /* finish_dynamic_link */
398 };
399
400 extern const bfd_target aout_mips_big_vec;
401
402 const bfd_target aout_mips_little_vec =
403 {
404 "a.out-mips-little", /* name */
405 bfd_target_aout_flavour,
406 BFD_ENDIAN_LITTLE, /* target byte order (little) */
407 BFD_ENDIAN_LITTLE, /* target headers byte order (little) */
408 (HAS_RELOC | EXEC_P | /* object flags */
409 HAS_LINENO | HAS_DEBUG |
410 HAS_SYMS | HAS_LOCALS | WP_TEXT | D_PAGED),
411 (SEC_HAS_CONTENTS | SEC_ALLOC | SEC_LOAD | SEC_RELOC | SEC_CODE | SEC_DATA),
412 MY_symbol_leading_char,
413 ' ', /* ar_pad_char */
414 15, /* ar_max_namelen */
415 bfd_getl64, bfd_getl_signed_64, bfd_putl64,
416 bfd_getl32, bfd_getl_signed_32, bfd_putl32,
417 bfd_getl16, bfd_getl_signed_16, bfd_putl16, /* data */
418 bfd_getl64, bfd_getl_signed_64, bfd_putl64,
419 bfd_getl32, bfd_getl_signed_32, bfd_putl32,
420 bfd_getl16, bfd_getl_signed_16, bfd_putl16, /* hdrs */
421 {_bfd_dummy_target, MY_object_p, /* bfd_check_format */
422 bfd_generic_archive_p, MY_core_file_p},
423 {bfd_false, MY_mkobject, /* bfd_set_format */
424 _bfd_generic_mkarchive, bfd_false},
425 {bfd_false, MY_write_object_contents, /* bfd_write_contents */
426 _bfd_write_archive_contents, bfd_false},
427
428 BFD_JUMP_TABLE_GENERIC (MY),
429 BFD_JUMP_TABLE_COPY (MY),
430 BFD_JUMP_TABLE_CORE (MY),
431 BFD_JUMP_TABLE_ARCHIVE (MY),
432 BFD_JUMP_TABLE_SYMBOLS (MY),
433 BFD_JUMP_TABLE_RELOCS (MY),
434 BFD_JUMP_TABLE_WRITE (MY),
435 BFD_JUMP_TABLE_LINK (MY),
436 BFD_JUMP_TABLE_DYNAMIC (_bfd_nodynamic),
437
438 & aout_mips_big_vec,
439
440 (PTR) MY_backend_data
441 };
442
443 const bfd_target aout_mips_big_vec =
444 {
445 "a.out-mips-big", /* name */
446 bfd_target_aout_flavour,
447 BFD_ENDIAN_BIG, /* target byte order (big) */
448 BFD_ENDIAN_BIG, /* target headers byte order (big) */
449 (HAS_RELOC | EXEC_P | /* object flags */
450 HAS_LINENO | HAS_DEBUG |
451 HAS_SYMS | HAS_LOCALS | WP_TEXT | D_PAGED),
452 (SEC_HAS_CONTENTS | SEC_ALLOC | SEC_LOAD | SEC_RELOC | SEC_CODE | SEC_DATA),
453 MY_symbol_leading_char,
454 ' ', /* ar_pad_char */
455 15, /* ar_max_namelen */
456 bfd_getb64, bfd_getb_signed_64, bfd_putb64,
457 bfd_getb32, bfd_getb_signed_32, bfd_putb32,
458 bfd_getb16, bfd_getb_signed_16, bfd_putb16, /* data */
459 bfd_getb64, bfd_getb_signed_64, bfd_putb64,
460 bfd_getb32, bfd_getb_signed_32, bfd_putb32,
461 bfd_getb16, bfd_getb_signed_16, bfd_putb16, /* hdrs */
462 {_bfd_dummy_target, MY_object_p, /* bfd_check_format */
463 bfd_generic_archive_p, MY_core_file_p},
464 {bfd_false, MY_mkobject, /* bfd_set_format */
465 _bfd_generic_mkarchive, bfd_false},
466 {bfd_false, MY_write_object_contents, /* bfd_write_contents */
467 _bfd_write_archive_contents, bfd_false},
468
469 BFD_JUMP_TABLE_GENERIC (MY),
470 BFD_JUMP_TABLE_COPY (MY),
471 BFD_JUMP_TABLE_CORE (MY),
472 BFD_JUMP_TABLE_ARCHIVE (MY),
473 BFD_JUMP_TABLE_SYMBOLS (MY),
474 BFD_JUMP_TABLE_RELOCS (MY),
475 BFD_JUMP_TABLE_WRITE (MY),
476 BFD_JUMP_TABLE_LINK (MY),
477 BFD_JUMP_TABLE_DYNAMIC (_bfd_nodynamic),
478
479 & aout_mips_little_vec,
480
481 (PTR) MY_backend_data
482 };
483