1 /* BFD backend for MIPS BSD (a.out) binaries.
2 Copyright (C) 1993, 94, 95, 97, 98, 1999 Free Software Foundation, Inc.
3 Written by Ralph Campbell.
5 This file is part of BFD, the Binary File Descriptor library.
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 2 of the License, or
10 (at your option) any later version.
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.
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., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA. */
21 #define BYTES_IN_WORD 4
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 */\
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'
38 #define MY(OP) CAT(mipsbsd_,OP)
45 #define SET_ARCH_MACH(ABFD, EXEC) \
46 MY(set_arch_mach)(ABFD, N_MACHTYPE (EXEC)); \
47 MY(choose_reloc_size)(ABFD);
48 static void MY(set_arch_mach) PARAMS ((bfd *abfd, int machtype));
49 static void MY(choose_reloc_size) PARAMS ((bfd *abfd));
51 #define MY_write_object_contents MY(write_object_contents)
52 static boolean MY(write_object_contents) PARAMS ((bfd *abfd));
54 /* We can't use MY(x) here because it leads to a recursive call to CAT
55 when expanded inside JUMP_TABLE. */
56 #define MY_bfd_reloc_type_lookup mipsbsd_reloc_howto_type_lookup
57 #define MY_canonicalize_reloc mipsbsd_canonicalize_reloc
59 #define MY_bfd_link_hash_table_create _bfd_generic_link_hash_table_create
60 #define MY_bfd_link_add_symbols _bfd_generic_link_add_symbols
61 #define MY_final_link_callback unused
62 #define MY_bfd_final_link _bfd_generic_final_link
64 #define MY_backend_data &MY(backend_data)
67 #include "aout-target.h"
70 MY(set_arch_mach) (abfd, machtype)
74 enum bfd_architecture arch;
77 /* Determine the architecture and machine type of the object file. */
91 arch = bfd_arch_obscure;
95 bfd_set_arch_mach(abfd, arch, machine);
98 /* Determine the size of a relocation entry, based on the architecture */
100 MY(choose_reloc_size) (abfd)
103 switch (bfd_get_arch(abfd)) {
107 obj_reloc_entry_size (abfd) = RELOC_EXT_SIZE;
110 obj_reloc_entry_size (abfd) = RELOC_STD_SIZE;
115 /* Write an object file in BSD a.out format.
116 Section contents have already been written. We write the
117 file header, symbols, and relocation. */
120 MY(write_object_contents) (abfd)
123 struct external_exec exec_bytes;
124 struct internal_exec *execp = exec_hdr (abfd);
126 /* Magic number, maestro, please! */
127 switch (bfd_get_arch(abfd)) {
129 switch (bfd_get_mach(abfd)) {
130 case bfd_mach_m68010:
131 N_SET_MACHTYPE(*execp, M_68010);
134 case bfd_mach_m68020:
135 N_SET_MACHTYPE(*execp, M_68020);
140 N_SET_MACHTYPE(*execp, M_SPARC);
143 N_SET_MACHTYPE(*execp, M_386);
146 N_SET_MACHTYPE(*execp, M_29K);
149 switch (bfd_get_mach(abfd)) {
152 N_SET_MACHTYPE(*execp, M_MIPS2);
155 N_SET_MACHTYPE(*execp, M_MIPS1);
160 N_SET_MACHTYPE(*execp, M_UNKNOWN);
163 MY(choose_reloc_size)(abfd);
165 WRITE_HEADERS(abfd, execp);
171 * MIPS relocation types.
173 #define MIPS_RELOC_32 0
174 #define MIPS_RELOC_JMP 1
175 #define MIPS_RELOC_WDISP16 2
176 #define MIPS_RELOC_HI16 3
177 #define MIPS_RELOC_HI16_S 4
178 #define MIPS_RELOC_LO16 5
181 * This is only called when performing a BFD_RELOC_MIPS_JMP relocation.
182 * The jump destination address is formed from the upper 4 bits of the
183 * "current" program counter concatenated with the jump instruction's
184 * 26 bit field and two trailing zeros.
185 * If the destination address is not in the same segment as the "current"
186 * program counter, then we need to signal an error.
188 static bfd_reloc_status_type
189 mips_fix_jmp_addr (abfd,reloc_entry,symbol,data,input_section,output_bfd)
190 bfd *abfd ATTRIBUTE_UNUSED;
191 arelent *reloc_entry;
192 struct symbol_cache_entry *symbol;
193 PTR data ATTRIBUTE_UNUSED;
194 asection *input_section;
197 bfd_vma relocation, pc;
199 /* If this is a partial relocation, just continue. */
200 if (output_bfd != (bfd *)NULL)
201 return bfd_reloc_continue;
203 /* If this is an undefined symbol, return error */
204 if (bfd_is_und_section (symbol->section)
205 && (symbol->flags & BSF_WEAK) == 0)
206 return bfd_reloc_undefined;
209 * Work out which section the relocation is targetted at and the
210 * initial relocation command value.
212 if (bfd_is_com_section (symbol->section))
215 relocation = symbol->value;
217 relocation += symbol->section->output_section->vma;
218 relocation += symbol->section->output_offset;
219 relocation += reloc_entry->addend;
221 pc = input_section->output_section->vma + input_section->output_offset +
222 reloc_entry->address + 4;
224 if ((relocation & 0xF0000000) != (pc & 0xF0000000))
225 return bfd_reloc_overflow;
227 return bfd_reloc_continue;
231 * This is only called when performing a BFD_RELOC_HI16_S relocation.
232 * We need to see if bit 15 is set in the result. If it is, we add
233 * 0x10000 and continue normally. This will compensate for the sign extension
234 * when the low bits are added at run time.
236 static bfd_reloc_status_type
237 mips_fix_hi16_s PARAMS ((bfd *, arelent *, asymbol *, PTR,
238 asection *, bfd *, char **));
240 static bfd_reloc_status_type
241 mips_fix_hi16_s (abfd, reloc_entry, symbol, data, input_section,
242 output_bfd, error_message)
243 bfd *abfd ATTRIBUTE_UNUSED;
244 arelent *reloc_entry;
246 PTR data ATTRIBUTE_UNUSED;
247 asection *input_section ATTRIBUTE_UNUSED;
249 char **error_message ATTRIBUTE_UNUSED;
253 /* If this is a partial relocation, just continue. */
254 if (output_bfd != (bfd *)NULL)
255 return bfd_reloc_continue;
257 /* If this is an undefined symbol, return error */
258 if (bfd_is_und_section (symbol->section)
259 && (symbol->flags & BSF_WEAK) == 0)
260 return bfd_reloc_undefined;
263 * Work out which section the relocation is targetted at and the
264 * initial relocation command value.
266 if (bfd_is_com_section (symbol->section))
269 relocation = symbol->value;
271 relocation += symbol->section->output_section->vma;
272 relocation += symbol->section->output_offset;
273 relocation += reloc_entry->addend;
275 if (relocation & 0x8000)
276 reloc_entry->addend += 0x10000;
278 return bfd_reloc_continue;
281 static reloc_howto_type mips_howto_table_ext[] = {
282 {MIPS_RELOC_32, 0, 2, 32, false, 0, complain_overflow_bitfield, 0,
283 "32", false, 0, 0xffffffff, false},
284 {MIPS_RELOC_JMP, 2, 2, 26, false, 0, complain_overflow_dont,
286 "MIPS_JMP", false, 0, 0x03ffffff, false},
287 {MIPS_RELOC_WDISP16, 2, 2, 16, true, 0, complain_overflow_signed, 0,
288 "WDISP16", false, 0, 0x0000ffff, false},
289 {MIPS_RELOC_HI16, 16, 2, 16, false, 0, complain_overflow_bitfield, 0,
290 "HI16", false, 0, 0x0000ffff, false},
291 {MIPS_RELOC_HI16_S, 16, 2, 16, false, 0, complain_overflow_bitfield,
293 "HI16_S", false, 0, 0x0000ffff, false},
294 {MIPS_RELOC_LO16, 0, 2, 16, false, 0, complain_overflow_dont, 0,
295 "LO16", false, 0, 0x0000ffff, false},
298 static reloc_howto_type *
299 MY(reloc_howto_type_lookup) (abfd, code)
301 bfd_reloc_code_real_type code;
304 if (bfd_get_arch (abfd) != bfd_arch_mips)
311 return (&mips_howto_table_ext[MIPS_RELOC_32]);
312 case BFD_RELOC_MIPS_JMP:
313 return (&mips_howto_table_ext[MIPS_RELOC_JMP]);
314 case BFD_RELOC_16_PCREL_S2:
315 return (&mips_howto_table_ext[MIPS_RELOC_WDISP16]);
317 return (&mips_howto_table_ext[MIPS_RELOC_HI16]);
318 case BFD_RELOC_HI16_S:
319 return (&mips_howto_table_ext[MIPS_RELOC_HI16_S]);
321 return (&mips_howto_table_ext[MIPS_RELOC_LO16]);
328 * This is just like the standard aoutx.h version but we need to do our
329 * own mapping of external reloc type values to howto entries.
332 MY(canonicalize_reloc)(abfd, section, relptr, symbols)
338 arelent *tblptr = section->relocation;
339 unsigned int count, c;
340 extern reloc_howto_type NAME(aout,ext_howto_table)[];
342 /* If we have already read in the relocation table, return the values. */
343 if (section->flags & SEC_CONSTRUCTOR) {
344 arelent_chain *chain = section->constructor_chain;
346 for (count = 0; count < section->reloc_count; count++) {
347 *relptr++ = &chain->relent;
351 return section->reloc_count;
353 if (tblptr && section->reloc_count) {
354 for (count = 0; count++ < section->reloc_count;)
355 *relptr++ = tblptr++;
357 return section->reloc_count;
360 if (!NAME(aout,slurp_reloc_table)(abfd, section, symbols))
362 tblptr = section->relocation;
364 /* fix up howto entries */
365 for (count = 0; count++ < section->reloc_count;)
367 c = tblptr->howto - NAME(aout,ext_howto_table);
368 tblptr->howto = &mips_howto_table_ext[c];
370 *relptr++ = tblptr++;
373 return section->reloc_count;
376 static CONST struct aout_backend_data MY(backend_data) = {
377 0, /* zmagic contiguous */
378 1, /* text incl header */
379 0, /* entry is text address */
380 0, /* exec_hdr_flags */
381 TARGET_PAGE_SIZE, /* text vma */
383 0, /* text size includes exec header */
384 0, /* add_dynamic_symbols */
385 0, /* add_one_symbol */
386 0, /* link_dynamic_object */
387 0, /* write_dynamic_symbol */
388 0, /* check_dynamic_reloc */
389 0 /* finish_dynamic_link */
392 extern const bfd_target aout_mips_big_vec;
394 const bfd_target aout_mips_little_vec =
396 "a.out-mips-little", /* name */
397 bfd_target_aout_flavour,
398 BFD_ENDIAN_LITTLE, /* target byte order (little) */
399 BFD_ENDIAN_LITTLE, /* target headers byte order (little) */
400 (HAS_RELOC | EXEC_P | /* object flags */
401 HAS_LINENO | HAS_DEBUG |
402 HAS_SYMS | HAS_LOCALS | WP_TEXT | D_PAGED),
403 (SEC_HAS_CONTENTS | SEC_ALLOC | SEC_LOAD | SEC_RELOC | SEC_CODE | SEC_DATA),
404 MY_symbol_leading_char,
405 ' ', /* ar_pad_char */
406 15, /* ar_max_namelen */
407 bfd_getl64, bfd_getl_signed_64, bfd_putl64,
408 bfd_getl32, bfd_getl_signed_32, bfd_putl32,
409 bfd_getl16, bfd_getl_signed_16, bfd_putl16, /* data */
410 bfd_getl64, bfd_getl_signed_64, bfd_putl64,
411 bfd_getl32, bfd_getl_signed_32, bfd_putl32,
412 bfd_getl16, bfd_getl_signed_16, bfd_putl16, /* hdrs */
413 {_bfd_dummy_target, MY_object_p, /* bfd_check_format */
414 bfd_generic_archive_p, MY_core_file_p},
415 {bfd_false, MY_mkobject, /* bfd_set_format */
416 _bfd_generic_mkarchive, bfd_false},
417 {bfd_false, MY_write_object_contents, /* bfd_write_contents */
418 _bfd_write_archive_contents, bfd_false},
420 BFD_JUMP_TABLE_GENERIC (MY),
421 BFD_JUMP_TABLE_COPY (MY),
422 BFD_JUMP_TABLE_CORE (MY),
423 BFD_JUMP_TABLE_ARCHIVE (MY),
424 BFD_JUMP_TABLE_SYMBOLS (MY),
425 BFD_JUMP_TABLE_RELOCS (MY),
426 BFD_JUMP_TABLE_WRITE (MY),
427 BFD_JUMP_TABLE_LINK (MY),
428 BFD_JUMP_TABLE_DYNAMIC (_bfd_nodynamic),
432 (PTR) MY_backend_data
435 const bfd_target aout_mips_big_vec =
437 "a.out-mips-big", /* name */
438 bfd_target_aout_flavour,
439 BFD_ENDIAN_BIG, /* target byte order (big) */
440 BFD_ENDIAN_BIG, /* target headers byte order (big) */
441 (HAS_RELOC | EXEC_P | /* object flags */
442 HAS_LINENO | HAS_DEBUG |
443 HAS_SYMS | HAS_LOCALS | WP_TEXT | D_PAGED),
444 (SEC_HAS_CONTENTS | SEC_ALLOC | SEC_LOAD | SEC_RELOC | SEC_CODE | SEC_DATA),
445 MY_symbol_leading_char,
446 ' ', /* ar_pad_char */
447 15, /* ar_max_namelen */
448 bfd_getb64, bfd_getb_signed_64, bfd_putb64,
449 bfd_getb32, bfd_getb_signed_32, bfd_putb32,
450 bfd_getb16, bfd_getb_signed_16, bfd_putb16, /* data */
451 bfd_getb64, bfd_getb_signed_64, bfd_putb64,
452 bfd_getb32, bfd_getb_signed_32, bfd_putb32,
453 bfd_getb16, bfd_getb_signed_16, bfd_putb16, /* hdrs */
454 {_bfd_dummy_target, MY_object_p, /* bfd_check_format */
455 bfd_generic_archive_p, MY_core_file_p},
456 {bfd_false, MY_mkobject, /* bfd_set_format */
457 _bfd_generic_mkarchive, bfd_false},
458 {bfd_false, MY_write_object_contents, /* bfd_write_contents */
459 _bfd_write_archive_contents, bfd_false},
461 BFD_JUMP_TABLE_GENERIC (MY),
462 BFD_JUMP_TABLE_COPY (MY),
463 BFD_JUMP_TABLE_CORE (MY),
464 BFD_JUMP_TABLE_ARCHIVE (MY),
465 BFD_JUMP_TABLE_SYMBOLS (MY),
466 BFD_JUMP_TABLE_RELOCS (MY),
467 BFD_JUMP_TABLE_WRITE (MY),
468 BFD_JUMP_TABLE_LINK (MY),
469 BFD_JUMP_TABLE_DYNAMIC (_bfd_nodynamic),
471 & aout_mips_little_vec,
473 (PTR) MY_backend_data