1 /* BFD backend for MIPS BSD (a.out) binaries.
2 Copyright 1993, 1994, 1995, 1997, 1998, 1999, 2000, 2001
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 02111-1307, USA. */
22 #define BYTES_IN_WORD 4
23 /* #define ENTRY_CAN_BE_ZERO */
24 #define N_HEADER_IN_TEXT(x) 1
25 #define N_SHARED_LIB(x) 0
26 #define N_TXTADDR(x) \
27 (N_MAGIC(x) != ZMAGIC ? (x).a_entry : /* object file or NMAGIC */\
28 TEXT_START_ADDR + EXEC_BYTES_SIZE /* no padding */\
30 #define N_DATADDR(x) (N_TXTADDR(x)+N_TXTSIZE(x))
31 #define TEXT_START_ADDR 4096
32 #define TARGET_PAGE_SIZE 4096
33 #define SEGMENT_SIZE TARGET_PAGE_SIZE
34 #define DEFAULT_ARCH bfd_arch_mips
35 #define MACHTYPE_OK(mtype) ((mtype) == M_UNKNOWN \
36 || (mtype) == M_MIPS1 || (mtype) == M_MIPS2)
37 #define MY_symbol_leading_char '\0'
39 #define MY(OP) CAT(mipsbsd_,OP)
46 #define SET_ARCH_MACH(ABFD, EXEC) \
47 MY(set_arch_mach) (ABFD, N_MACHTYPE (EXEC)); \
48 MY(choose_reloc_size) (ABFD);
49 static void MY(set_arch_mach
) PARAMS ((bfd
*abfd
, int machtype
));
50 static void MY(choose_reloc_size
) PARAMS ((bfd
*abfd
));
52 #define MY_write_object_contents MY(write_object_contents)
53 static boolean
MY(write_object_contents
) PARAMS ((bfd
*abfd
));
55 /* We can't use MY(x) here because it leads to a recursive call to CAT
56 when expanded inside JUMP_TABLE. */
57 #define MY_bfd_reloc_type_lookup mipsbsd_reloc_howto_type_lookup
58 #define MY_canonicalize_reloc mipsbsd_canonicalize_reloc
60 #define MY_bfd_link_hash_table_create _bfd_generic_link_hash_table_create
61 #define MY_bfd_link_add_symbols _bfd_generic_link_add_symbols
62 #define MY_final_link_callback unused
63 #define MY_bfd_final_link _bfd_generic_final_link
65 #define MY_backend_data &MY(backend_data)
68 #include "aout-target.h"
70 static bfd_reloc_status_type mips_fix_jmp_addr
PARAMS ((bfd
*, arelent
*, struct symbol_cache_entry
*, PTR
, asection
*, bfd
*));
71 static reloc_howto_type
* MY(reloc_howto_type_lookup
) PARAMS ((bfd
*, bfd_reloc_code_real_type
));
73 long MY(canonicalize_reloc
) PARAMS ((bfd
*, sec_ptr
, arelent
**, asymbol
**));
76 MY(set_arch_mach
) (abfd
, machtype
)
80 enum bfd_architecture arch
;
83 /* Determine the architecture and machine type of the object file. */
97 arch
= bfd_arch_obscure
;
102 bfd_set_arch_mach (abfd
, arch
, machine
);
105 /* Determine the size of a relocation entry, based on the architecture */
107 MY (choose_reloc_size
) (abfd
)
110 switch (bfd_get_arch (abfd
))
115 obj_reloc_entry_size (abfd
) = RELOC_EXT_SIZE
;
118 obj_reloc_entry_size (abfd
) = RELOC_STD_SIZE
;
123 /* Write an object file in BSD a.out format.
124 Section contents have already been written. We write the
125 file header, symbols, and relocation. */
128 MY (write_object_contents
) (abfd
)
131 struct external_exec exec_bytes
;
132 struct internal_exec
*execp
= exec_hdr (abfd
);
134 /* Magic number, maestro, please! */
135 switch (bfd_get_arch (abfd
))
138 switch (bfd_get_mach (abfd
))
140 case bfd_mach_m68010
:
141 N_SET_MACHTYPE (*execp
, M_68010
);
144 case bfd_mach_m68020
:
145 N_SET_MACHTYPE (*execp
, M_68020
);
150 N_SET_MACHTYPE (*execp
, M_SPARC
);
153 N_SET_MACHTYPE (*execp
, M_386
);
156 N_SET_MACHTYPE (*execp
, M_29K
);
159 switch (bfd_get_mach (abfd
))
163 N_SET_MACHTYPE (*execp
, M_MIPS2
);
166 N_SET_MACHTYPE (*execp
, M_MIPS1
);
171 N_SET_MACHTYPE (*execp
, M_UNKNOWN
);
174 MY (choose_reloc_size
) (abfd
);
176 WRITE_HEADERS (abfd
, execp
);
181 /* MIPS relocation types. */
182 #define MIPS_RELOC_32 0
183 #define MIPS_RELOC_JMP 1
184 #define MIPS_RELOC_WDISP16 2
185 #define MIPS_RELOC_HI16 3
186 #define MIPS_RELOC_HI16_S 4
187 #define MIPS_RELOC_LO16 5
189 /* This is only called when performing a BFD_RELOC_MIPS_JMP relocation.
190 The jump destination address is formed from the upper 4 bits of the
191 "current" program counter concatenated with the jump instruction's
192 26 bit field and two trailing zeros.
193 If the destination address is not in the same segment as the "current"
194 program counter, then we need to signal an error. */
196 static bfd_reloc_status_type
197 mips_fix_jmp_addr (abfd
,reloc_entry
,symbol
,data
,input_section
,output_bfd
)
198 bfd
*abfd ATTRIBUTE_UNUSED
;
199 arelent
*reloc_entry
;
200 struct symbol_cache_entry
*symbol
;
201 PTR data ATTRIBUTE_UNUSED
;
202 asection
*input_section
;
205 bfd_vma relocation
, pc
;
207 /* If this is a partial relocation, just continue. */
208 if (output_bfd
!= (bfd
*)NULL
)
209 return bfd_reloc_continue
;
211 /* If this is an undefined symbol, return error */
212 if (bfd_is_und_section (symbol
->section
)
213 && (symbol
->flags
& BSF_WEAK
) == 0)
214 return bfd_reloc_undefined
;
216 /* Work out which section the relocation is targetted at and the
217 initial relocation command value. */
218 if (bfd_is_com_section (symbol
->section
))
221 relocation
= symbol
->value
;
223 relocation
+= symbol
->section
->output_section
->vma
;
224 relocation
+= symbol
->section
->output_offset
;
225 relocation
+= reloc_entry
->addend
;
227 pc
= input_section
->output_section
->vma
+ input_section
->output_offset
+
228 reloc_entry
->address
+ 4;
230 if ((relocation
& 0xF0000000) != (pc
& 0xF0000000))
231 return bfd_reloc_overflow
;
233 return bfd_reloc_continue
;
236 /* This is only called when performing a BFD_RELOC_HI16_S relocation.
237 We need to see if bit 15 is set in the result. If it is, we add
238 0x10000 and continue normally. This will compensate for the sign extension
239 when the low bits are added at run time. */
241 static bfd_reloc_status_type
242 mips_fix_hi16_s
PARAMS ((bfd
*, arelent
*, asymbol
*, PTR
,
243 asection
*, bfd
*, char **));
245 static bfd_reloc_status_type
246 mips_fix_hi16_s (abfd
, reloc_entry
, symbol
, data
, input_section
,
247 output_bfd
, error_message
)
248 bfd
*abfd ATTRIBUTE_UNUSED
;
249 arelent
*reloc_entry
;
251 PTR data ATTRIBUTE_UNUSED
;
252 asection
*input_section ATTRIBUTE_UNUSED
;
254 char **error_message ATTRIBUTE_UNUSED
;
258 /* If this is a partial relocation, just continue. */
259 if (output_bfd
!= (bfd
*)NULL
)
260 return bfd_reloc_continue
;
262 /* If this is an undefined symbol, return error. */
263 if (bfd_is_und_section (symbol
->section
)
264 && (symbol
->flags
& BSF_WEAK
) == 0)
265 return bfd_reloc_undefined
;
267 /* Work out which section the relocation is targetted at and the
268 initial relocation command value. */
269 if (bfd_is_com_section (symbol
->section
))
272 relocation
= symbol
->value
;
274 relocation
+= symbol
->section
->output_section
->vma
;
275 relocation
+= symbol
->section
->output_offset
;
276 relocation
+= reloc_entry
->addend
;
278 if (relocation
& 0x8000)
279 reloc_entry
->addend
+= 0x10000;
281 return bfd_reloc_continue
;
284 static reloc_howto_type mips_howto_table_ext
[] = {
285 {MIPS_RELOC_32
, 0, 2, 32, false, 0, complain_overflow_bitfield
, 0,
286 "32", false, 0, 0xffffffff, false},
287 {MIPS_RELOC_JMP
, 2, 2, 26, false, 0, complain_overflow_dont
,
289 "MIPS_JMP", false, 0, 0x03ffffff, false},
290 {MIPS_RELOC_WDISP16
, 2, 2, 16, true, 0, complain_overflow_signed
, 0,
291 "WDISP16", false, 0, 0x0000ffff, false},
292 {MIPS_RELOC_HI16
, 16, 2, 16, false, 0, complain_overflow_bitfield
, 0,
293 "HI16", false, 0, 0x0000ffff, false},
294 {MIPS_RELOC_HI16_S
, 16, 2, 16, false, 0, complain_overflow_bitfield
,
296 "HI16_S", false, 0, 0x0000ffff, false},
297 {MIPS_RELOC_LO16
, 0, 2, 16, false, 0, complain_overflow_dont
, 0,
298 "LO16", false, 0, 0x0000ffff, false},
301 static reloc_howto_type
*
302 MY(reloc_howto_type_lookup
) (abfd
, code
)
304 bfd_reloc_code_real_type code
;
307 if (bfd_get_arch (abfd
) != bfd_arch_mips
)
314 return (&mips_howto_table_ext
[MIPS_RELOC_32
]);
315 case BFD_RELOC_MIPS_JMP
:
316 return (&mips_howto_table_ext
[MIPS_RELOC_JMP
]);
317 case BFD_RELOC_16_PCREL_S2
:
318 return (&mips_howto_table_ext
[MIPS_RELOC_WDISP16
]);
320 return (&mips_howto_table_ext
[MIPS_RELOC_HI16
]);
321 case BFD_RELOC_HI16_S
:
322 return (&mips_howto_table_ext
[MIPS_RELOC_HI16_S
]);
324 return (&mips_howto_table_ext
[MIPS_RELOC_LO16
]);
330 /* This is just like the standard aoutx.h version but we need to do our
331 own mapping of external reloc type values to howto entries. */
333 MY(canonicalize_reloc
) (abfd
, section
, relptr
, symbols
)
339 arelent
*tblptr
= section
->relocation
;
340 unsigned int count
, c
;
341 extern reloc_howto_type
NAME(aout
,ext_howto_table
)[];
343 /* If we have already read in the relocation table, return the values. */
344 if (section
->flags
& SEC_CONSTRUCTOR
)
346 arelent_chain
*chain
= section
->constructor_chain
;
348 for (count
= 0; count
< section
->reloc_count
; count
++)
350 *relptr
++ = &chain
->relent
;
354 return section
->reloc_count
;
357 if (tblptr
&& section
->reloc_count
)
359 for (count
= 0; count
++ < section
->reloc_count
;)
360 *relptr
++ = tblptr
++;
362 return section
->reloc_count
;
365 if (!NAME(aout
,slurp_reloc_table
) (abfd
, section
, symbols
))
367 tblptr
= section
->relocation
;
369 /* fix up howto entries. */
370 for (count
= 0; count
++ < section
->reloc_count
;)
372 c
= tblptr
->howto
- NAME(aout
,ext_howto_table
);
373 tblptr
->howto
= &mips_howto_table_ext
[c
];
375 *relptr
++ = tblptr
++;
378 return section
->reloc_count
;
381 static CONST
struct aout_backend_data
MY(backend_data
) = {
382 0, /* zmagic contiguous */
383 1, /* text incl header */
384 0, /* entry is text address */
385 0, /* exec_hdr_flags */
386 TARGET_PAGE_SIZE
, /* text vma */
388 0, /* text size includes exec header */
389 0, /* add_dynamic_symbols */
390 0, /* add_one_symbol */
391 0, /* link_dynamic_object */
392 0, /* write_dynamic_symbol */
393 0, /* check_dynamic_reloc */
394 0 /* finish_dynamic_link */
397 extern const bfd_target aout_mips_big_vec
;
399 const bfd_target aout_mips_little_vec
=
401 "a.out-mips-little", /* name */
402 bfd_target_aout_flavour
,
403 BFD_ENDIAN_LITTLE
, /* target byte order (little) */
404 BFD_ENDIAN_LITTLE
, /* target headers byte order (little) */
405 (HAS_RELOC
| EXEC_P
| /* object flags */
406 HAS_LINENO
| HAS_DEBUG
|
407 HAS_SYMS
| HAS_LOCALS
| WP_TEXT
| D_PAGED
),
408 (SEC_HAS_CONTENTS
| SEC_ALLOC
| SEC_LOAD
| SEC_RELOC
| SEC_CODE
| SEC_DATA
),
409 MY_symbol_leading_char
,
410 ' ', /* ar_pad_char */
411 15, /* ar_max_namelen */
412 bfd_getl64
, bfd_getl_signed_64
, bfd_putl64
,
413 bfd_getl32
, bfd_getl_signed_32
, bfd_putl32
,
414 bfd_getl16
, bfd_getl_signed_16
, bfd_putl16
, /* data */
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
, /* hdrs */
418 {_bfd_dummy_target
, MY_object_p
, /* bfd_check_format */
419 bfd_generic_archive_p
, MY_core_file_p
},
420 {bfd_false
, MY_mkobject
, /* bfd_set_format */
421 _bfd_generic_mkarchive
, bfd_false
},
422 {bfd_false
, MY_write_object_contents
, /* bfd_write_contents */
423 _bfd_write_archive_contents
, bfd_false
},
425 BFD_JUMP_TABLE_GENERIC (MY
),
426 BFD_JUMP_TABLE_COPY (MY
),
427 BFD_JUMP_TABLE_CORE (MY
),
428 BFD_JUMP_TABLE_ARCHIVE (MY
),
429 BFD_JUMP_TABLE_SYMBOLS (MY
),
430 BFD_JUMP_TABLE_RELOCS (MY
),
431 BFD_JUMP_TABLE_WRITE (MY
),
432 BFD_JUMP_TABLE_LINK (MY
),
433 BFD_JUMP_TABLE_DYNAMIC (_bfd_nodynamic
),
437 (PTR
) MY_backend_data
440 const bfd_target aout_mips_big_vec
=
442 "a.out-mips-big", /* name */
443 bfd_target_aout_flavour
,
444 BFD_ENDIAN_BIG
, /* target byte order (big) */
445 BFD_ENDIAN_BIG
, /* target headers byte order (big) */
446 (HAS_RELOC
| EXEC_P
| /* object flags */
447 HAS_LINENO
| HAS_DEBUG
|
448 HAS_SYMS
| HAS_LOCALS
| WP_TEXT
| D_PAGED
),
449 (SEC_HAS_CONTENTS
| SEC_ALLOC
| SEC_LOAD
| SEC_RELOC
| SEC_CODE
| SEC_DATA
),
450 MY_symbol_leading_char
,
451 ' ', /* ar_pad_char */
452 15, /* ar_max_namelen */
453 bfd_getb64
, bfd_getb_signed_64
, bfd_putb64
,
454 bfd_getb32
, bfd_getb_signed_32
, bfd_putb32
,
455 bfd_getb16
, bfd_getb_signed_16
, bfd_putb16
, /* data */
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
, /* hdrs */
459 {_bfd_dummy_target
, MY_object_p
, /* bfd_check_format */
460 bfd_generic_archive_p
, MY_core_file_p
},
461 {bfd_false
, MY_mkobject
, /* bfd_set_format */
462 _bfd_generic_mkarchive
, bfd_false
},
463 {bfd_false
, MY_write_object_contents
, /* bfd_write_contents */
464 _bfd_write_archive_contents
, bfd_false
},
466 BFD_JUMP_TABLE_GENERIC (MY
),
467 BFD_JUMP_TABLE_COPY (MY
),
468 BFD_JUMP_TABLE_CORE (MY
),
469 BFD_JUMP_TABLE_ARCHIVE (MY
),
470 BFD_JUMP_TABLE_SYMBOLS (MY
),
471 BFD_JUMP_TABLE_RELOCS (MY
),
472 BFD_JUMP_TABLE_WRITE (MY
),
473 BFD_JUMP_TABLE_LINK (MY
),
474 BFD_JUMP_TABLE_DYNAMIC (_bfd_nodynamic
),
476 & aout_mips_little_vec
,
478 (PTR
) MY_backend_data