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.
6 This file is part of BFD, the Binary File Descriptor library.
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.
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.
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., 59 Temple Place - Suite 330, Boston, MA 02110-1301, USA. */
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 /* Do not "beautify" the CONCAT* macro args. Traditional C will not
39 remove whitespace added here, and thus will fail to concatenate
41 #define MY(OP) CONCAT2 (mipsbsd_,OP)
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));
54 #define MY_write_object_contents MY(write_object_contents)
55 static bfd_boolean MY(write_object_contents) PARAMS ((bfd *abfd));
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
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
67 #define MY_backend_data &MY(backend_data)
70 #include "aout-target.h"
72 static bfd_reloc_status_type mips_fix_jmp_addr
73 PARAMS ((bfd *, arelent *, struct bfd_symbol *, PTR, asection *,
75 static reloc_howto_type *MY(reloc_howto_type_lookup)
76 PARAMS ((bfd *, bfd_reloc_code_real_type));
78 long MY(canonicalize_reloc) PARAMS ((bfd *, sec_ptr, arelent **, asymbol **));
81 MY(set_arch_mach) (abfd, machtype)
83 unsigned long machtype;
85 enum bfd_architecture arch;
88 /* Determine the architecture and machine type of the object file. */
93 machine = bfd_mach_mips3000;
98 machine = bfd_mach_mips4000;
102 arch = bfd_arch_obscure;
107 bfd_set_arch_mach (abfd, arch, machine);
110 /* Determine the size of a relocation entry, based on the architecture */
112 MY (choose_reloc_size) (abfd)
115 switch (bfd_get_arch (abfd))
120 obj_reloc_entry_size (abfd) = RELOC_EXT_SIZE;
123 obj_reloc_entry_size (abfd) = RELOC_STD_SIZE;
128 /* Write an object file in BSD a.out format.
129 Section contents have already been written. We write the
130 file header, symbols, and relocation. */
133 MY (write_object_contents) (abfd)
136 struct external_exec exec_bytes;
137 struct internal_exec *execp = exec_hdr (abfd);
139 /* Magic number, maestro, please! */
140 switch (bfd_get_arch (abfd))
143 switch (bfd_get_mach (abfd))
145 case bfd_mach_m68010:
146 N_SET_MACHTYPE (*execp, M_68010);
149 case bfd_mach_m68020:
150 N_SET_MACHTYPE (*execp, M_68020);
155 N_SET_MACHTYPE (*execp, M_SPARC);
158 N_SET_MACHTYPE (*execp, M_386);
161 N_SET_MACHTYPE (*execp, M_29K);
164 switch (bfd_get_mach (abfd))
166 case bfd_mach_mips4000:
167 case bfd_mach_mips6000:
168 N_SET_MACHTYPE (*execp, M_MIPS2);
171 N_SET_MACHTYPE (*execp, M_MIPS1);
176 N_SET_MACHTYPE (*execp, M_UNKNOWN);
179 MY (choose_reloc_size) (abfd);
181 WRITE_HEADERS (abfd, execp);
186 /* MIPS relocation types. */
187 #define MIPS_RELOC_32 0
188 #define MIPS_RELOC_JMP 1
189 #define MIPS_RELOC_WDISP16 2
190 #define MIPS_RELOC_HI16 3
191 #define MIPS_RELOC_HI16_S 4
192 #define MIPS_RELOC_LO16 5
194 /* This is only called when performing a BFD_RELOC_MIPS_JMP relocation.
195 The jump destination address is formed from the upper 4 bits of the
196 "current" program counter concatenated with the jump instruction's
197 26 bit field and two trailing zeros.
198 If the destination address is not in the same segment as the "current"
199 program counter, then we need to signal an error. */
201 static bfd_reloc_status_type
202 mips_fix_jmp_addr (abfd, reloc_entry, symbol, data, input_section, output_bfd,
204 bfd *abfd ATTRIBUTE_UNUSED;
205 arelent *reloc_entry;
206 struct bfd_symbol *symbol;
207 PTR data ATTRIBUTE_UNUSED;
208 asection *input_section;
210 char **error_message ATTRIBUTE_UNUSED;
212 bfd_vma relocation, pc;
214 /* If this is a partial relocation, just continue. */
215 if (output_bfd != (bfd *)NULL)
216 return bfd_reloc_continue;
218 /* If this is an undefined symbol, return error */
219 if (bfd_is_und_section (symbol->section)
220 && (symbol->flags & BSF_WEAK) == 0)
221 return bfd_reloc_undefined;
223 /* Work out which section the relocation is targeted at and the
224 initial relocation command value. */
225 if (bfd_is_com_section (symbol->section))
228 relocation = symbol->value;
230 relocation += symbol->section->output_section->vma;
231 relocation += symbol->section->output_offset;
232 relocation += reloc_entry->addend;
234 pc = input_section->output_section->vma + input_section->output_offset +
235 reloc_entry->address + 4;
237 if ((relocation & 0xF0000000) != (pc & 0xF0000000))
238 return bfd_reloc_overflow;
240 return bfd_reloc_continue;
243 /* This is only called when performing a BFD_RELOC_HI16_S relocation.
244 We need to see if bit 15 is set in the result. If it is, we add
245 0x10000 and continue normally. This will compensate for the sign extension
246 when the low bits are added at run time. */
248 static bfd_reloc_status_type
249 mips_fix_hi16_s PARAMS ((bfd *, arelent *, asymbol *, PTR,
250 asection *, bfd *, char **));
252 static bfd_reloc_status_type
253 mips_fix_hi16_s (abfd, reloc_entry, symbol, data, input_section,
254 output_bfd, error_message)
255 bfd *abfd ATTRIBUTE_UNUSED;
256 arelent *reloc_entry;
258 PTR data ATTRIBUTE_UNUSED;
259 asection *input_section ATTRIBUTE_UNUSED;
261 char **error_message ATTRIBUTE_UNUSED;
265 /* If this is a partial relocation, just continue. */
266 if (output_bfd != (bfd *)NULL)
267 return bfd_reloc_continue;
269 /* If this is an undefined symbol, return error. */
270 if (bfd_is_und_section (symbol->section)
271 && (symbol->flags & BSF_WEAK) == 0)
272 return bfd_reloc_undefined;
274 /* Work out which section the relocation is targeted at and the
275 initial relocation command value. */
276 if (bfd_is_com_section (symbol->section))
279 relocation = symbol->value;
281 relocation += symbol->section->output_section->vma;
282 relocation += symbol->section->output_offset;
283 relocation += reloc_entry->addend;
285 if (relocation & 0x8000)
286 reloc_entry->addend += 0x10000;
288 return bfd_reloc_continue;
291 static reloc_howto_type mips_howto_table_ext[] = {
292 {MIPS_RELOC_32, 0, 2, 32, FALSE, 0, complain_overflow_bitfield, 0,
293 "32", FALSE, 0, 0xffffffff, FALSE},
294 {MIPS_RELOC_JMP, 2, 2, 26, FALSE, 0, complain_overflow_dont,
296 "MIPS_JMP", FALSE, 0, 0x03ffffff, FALSE},
297 {MIPS_RELOC_WDISP16, 2, 2, 16, TRUE, 0, complain_overflow_signed, 0,
298 "WDISP16", FALSE, 0, 0x0000ffff, FALSE},
299 {MIPS_RELOC_HI16, 16, 2, 16, FALSE, 0, complain_overflow_bitfield, 0,
300 "HI16", FALSE, 0, 0x0000ffff, FALSE},
301 {MIPS_RELOC_HI16_S, 16, 2, 16, FALSE, 0, complain_overflow_bitfield,
303 "HI16_S", FALSE, 0, 0x0000ffff, FALSE},
304 {MIPS_RELOC_LO16, 0, 2, 16, FALSE, 0, complain_overflow_dont, 0,
305 "LO16", FALSE, 0, 0x0000ffff, FALSE},
308 static reloc_howto_type *
309 MY(reloc_howto_type_lookup) (abfd, code)
311 bfd_reloc_code_real_type code;
314 if (bfd_get_arch (abfd) != bfd_arch_mips)
321 return (&mips_howto_table_ext[MIPS_RELOC_32]);
322 case BFD_RELOC_MIPS_JMP:
323 return (&mips_howto_table_ext[MIPS_RELOC_JMP]);
324 case BFD_RELOC_16_PCREL_S2:
325 return (&mips_howto_table_ext[MIPS_RELOC_WDISP16]);
327 return (&mips_howto_table_ext[MIPS_RELOC_HI16]);
328 case BFD_RELOC_HI16_S:
329 return (&mips_howto_table_ext[MIPS_RELOC_HI16_S]);
331 return (&mips_howto_table_ext[MIPS_RELOC_LO16]);
337 /* This is just like the standard aoutx.h version but we need to do our
338 own mapping of external reloc type values to howto entries. */
340 MY(canonicalize_reloc) (abfd, section, relptr, symbols)
346 arelent *tblptr = section->relocation;
347 unsigned int count, c;
348 extern reloc_howto_type NAME(aout,ext_howto_table)[];
350 /* If we have already read in the relocation table, return the values. */
351 if (section->flags & SEC_CONSTRUCTOR)
353 arelent_chain *chain = section->constructor_chain;
355 for (count = 0; count < section->reloc_count; count++)
357 *relptr++ = &chain->relent;
361 return section->reloc_count;
364 if (tblptr && section->reloc_count)
366 for (count = 0; count++ < section->reloc_count;)
367 *relptr++ = tblptr++;
369 return section->reloc_count;
372 if (!NAME(aout,slurp_reloc_table) (abfd, section, symbols))
374 tblptr = section->relocation;
376 /* fix up howto entries. */
377 for (count = 0; count++ < section->reloc_count;)
379 c = tblptr->howto - NAME(aout,ext_howto_table);
380 tblptr->howto = &mips_howto_table_ext[c];
382 *relptr++ = tblptr++;
385 return section->reloc_count;
388 static const struct aout_backend_data MY(backend_data) = {
389 0, /* zmagic contiguous */
390 1, /* text incl header */
391 0, /* entry is text address */
392 0, /* exec_hdr_flags */
393 TARGET_PAGE_SIZE, /* text vma */
395 0, /* text size includes exec header */
396 0, /* add_dynamic_symbols */
397 0, /* add_one_symbol */
398 0, /* link_dynamic_object */
399 0, /* write_dynamic_symbol */
400 0, /* check_dynamic_reloc */
401 0 /* finish_dynamic_link */
404 extern const bfd_target aout_mips_big_vec;
406 const bfd_target aout_mips_little_vec =
408 "a.out-mips-little", /* name */
409 bfd_target_aout_flavour,
410 BFD_ENDIAN_LITTLE, /* target byte order (little) */
411 BFD_ENDIAN_LITTLE, /* target headers byte order (little) */
412 (HAS_RELOC | EXEC_P | /* object flags */
413 HAS_LINENO | HAS_DEBUG |
414 HAS_SYMS | HAS_LOCALS | WP_TEXT | D_PAGED),
415 (SEC_HAS_CONTENTS | SEC_ALLOC | SEC_LOAD | SEC_RELOC | SEC_CODE | SEC_DATA),
416 MY_symbol_leading_char,
417 ' ', /* ar_pad_char */
418 15, /* ar_max_namelen */
419 bfd_getl64, bfd_getl_signed_64, bfd_putl64,
420 bfd_getl32, bfd_getl_signed_32, bfd_putl32,
421 bfd_getl16, bfd_getl_signed_16, bfd_putl16, /* data */
422 bfd_getl64, bfd_getl_signed_64, bfd_putl64,
423 bfd_getl32, bfd_getl_signed_32, bfd_putl32,
424 bfd_getl16, bfd_getl_signed_16, bfd_putl16, /* hdrs */
425 {_bfd_dummy_target, MY_object_p, /* bfd_check_format */
426 bfd_generic_archive_p, MY_core_file_p},
427 {bfd_false, MY_mkobject, /* bfd_set_format */
428 _bfd_generic_mkarchive, bfd_false},
429 {bfd_false, MY_write_object_contents, /* bfd_write_contents */
430 _bfd_write_archive_contents, bfd_false},
432 BFD_JUMP_TABLE_GENERIC (MY),
433 BFD_JUMP_TABLE_COPY (MY),
434 BFD_JUMP_TABLE_CORE (MY),
435 BFD_JUMP_TABLE_ARCHIVE (MY),
436 BFD_JUMP_TABLE_SYMBOLS (MY),
437 BFD_JUMP_TABLE_RELOCS (MY),
438 BFD_JUMP_TABLE_WRITE (MY),
439 BFD_JUMP_TABLE_LINK (MY),
440 BFD_JUMP_TABLE_DYNAMIC (_bfd_nodynamic),
444 (PTR) MY_backend_data
447 const bfd_target aout_mips_big_vec =
449 "a.out-mips-big", /* name */
450 bfd_target_aout_flavour,
451 BFD_ENDIAN_BIG, /* target byte order (big) */
452 BFD_ENDIAN_BIG, /* target headers byte order (big) */
453 (HAS_RELOC | EXEC_P | /* object flags */
454 HAS_LINENO | HAS_DEBUG |
455 HAS_SYMS | HAS_LOCALS | WP_TEXT | D_PAGED),
456 (SEC_HAS_CONTENTS | SEC_ALLOC | SEC_LOAD | SEC_RELOC | SEC_CODE | SEC_DATA),
457 MY_symbol_leading_char,
458 ' ', /* ar_pad_char */
459 15, /* ar_max_namelen */
460 bfd_getb64, bfd_getb_signed_64, bfd_putb64,
461 bfd_getb32, bfd_getb_signed_32, bfd_putb32,
462 bfd_getb16, bfd_getb_signed_16, bfd_putb16, /* data */
463 bfd_getb64, bfd_getb_signed_64, bfd_putb64,
464 bfd_getb32, bfd_getb_signed_32, bfd_putb32,
465 bfd_getb16, bfd_getb_signed_16, bfd_putb16, /* hdrs */
466 {_bfd_dummy_target, MY_object_p, /* bfd_check_format */
467 bfd_generic_archive_p, MY_core_file_p},
468 {bfd_false, MY_mkobject, /* bfd_set_format */
469 _bfd_generic_mkarchive, bfd_false},
470 {bfd_false, MY_write_object_contents, /* bfd_write_contents */
471 _bfd_write_archive_contents, bfd_false},
473 BFD_JUMP_TABLE_GENERIC (MY),
474 BFD_JUMP_TABLE_COPY (MY),
475 BFD_JUMP_TABLE_CORE (MY),
476 BFD_JUMP_TABLE_ARCHIVE (MY),
477 BFD_JUMP_TABLE_SYMBOLS (MY),
478 BFD_JUMP_TABLE_RELOCS (MY),
479 BFD_JUMP_TABLE_WRITE (MY),
480 BFD_JUMP_TABLE_LINK (MY),
481 BFD_JUMP_TABLE_DYNAMIC (_bfd_nodynamic),
483 & aout_mips_little_vec,
485 (PTR) MY_backend_data