1 /* BFD backend for MIPS BSD (a.out) binaries.
2 Copyright (C) 1993, 1994 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., 675 Mass Ave, Cambridge, MA 02139, USA. */
21 #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 PAGE_SIZE 4096
33 #define SEGMENT_SIZE 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 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"
71 MY(set_arch_mach
) (abfd
, machtype
)
75 enum bfd_architecture arch
;
78 /* Determine the architecture and machine type of the object file. */
92 arch
= bfd_arch_obscure
;
96 bfd_set_arch_mach(abfd
, arch
, machine
);
99 /* Determine the size of a relocation entry, based on the architecture */
101 MY(choose_reloc_size
) (abfd
)
104 switch (bfd_get_arch(abfd
)) {
108 obj_reloc_entry_size (abfd
) = RELOC_EXT_SIZE
;
111 obj_reloc_entry_size (abfd
) = RELOC_STD_SIZE
;
116 /* Write an object file in BSD a.out format.
117 Section contents have already been written. We write the
118 file header, symbols, and relocation. */
121 MY(write_object_contents
) (abfd
)
124 struct external_exec exec_bytes
;
125 struct internal_exec
*execp
= exec_hdr (abfd
);
127 /* Magic number, maestro, please! */
128 switch (bfd_get_arch(abfd
)) {
130 switch (bfd_get_mach(abfd
)) {
132 N_SET_MACHTYPE(*execp
, M_68010
);
136 N_SET_MACHTYPE(*execp
, M_68020
);
141 N_SET_MACHTYPE(*execp
, M_SPARC
);
144 N_SET_MACHTYPE(*execp
, M_386
);
147 N_SET_MACHTYPE(*execp
, M_29K
);
150 switch (bfd_get_mach(abfd
)) {
153 N_SET_MACHTYPE(*execp
, M_MIPS2
);
156 N_SET_MACHTYPE(*execp
, M_MIPS1
);
161 N_SET_MACHTYPE(*execp
, M_UNKNOWN
);
164 MY(choose_reloc_size
)(abfd
);
166 WRITE_HEADERS(abfd
, execp
);
172 * MIPS relocation types.
174 #define MIPS_RELOC_32 0
175 #define MIPS_RELOC_JMP 1
176 #define MIPS_RELOC_WDISP16 2
177 #define MIPS_RELOC_HI16 3
178 #define MIPS_RELOC_HI16_S 4
179 #define MIPS_RELOC_LO16 5
182 * This is only called when performing a BFD_RELOC_MIPS_JMP relocation.
183 * The jump destination address is formed from the upper 4 bits of the
184 * "current" program counter concatenated with the jump instruction's
185 * 26 bit field and two trailing zeros.
186 * If the destination address is not in the same segment as the "current"
187 * program counter, then we need to signal an error.
189 static bfd_reloc_status_type
190 mips_fix_jmp_addr (abfd
,reloc_entry
,symbol
,data
,input_section
,output_bfd
)
192 arelent
*reloc_entry
;
193 struct symbol_cache_entry
*symbol
;
195 asection
*input_section
;
198 bfd_vma relocation
, pc
;
200 /* If this is a partial relocation, just continue. */
201 if (output_bfd
!= (bfd
*)NULL
)
202 return bfd_reloc_continue
;
204 /* If this is an undefined symbol, return error */
205 if (symbol
->section
== &bfd_und_section
206 && (symbol
->flags
& BSF_WEAK
) == 0)
207 return bfd_reloc_undefined
;
210 * Work out which section the relocation is targetted at and the
211 * initial relocation command value.
213 if (bfd_is_com_section (symbol
->section
))
216 relocation
= symbol
->value
;
218 relocation
+= symbol
->section
->output_section
->vma
;
219 relocation
+= symbol
->section
->output_offset
;
220 relocation
+= reloc_entry
->addend
;
222 pc
= input_section
->output_section
->vma
+ input_section
->output_offset
+
223 reloc_entry
->address
+ 4;
225 if ((relocation
& 0xF0000000) != (pc
& 0xF0000000))
226 return bfd_reloc_overflow
;
228 return bfd_reloc_continue
;
232 * This is only called when performing a BFD_RELOC_HI16_S relocation.
233 * We need to see if bit 15 is set in the result. If it is, we add
234 * 0x10000 and continue normally. This will compensate for the sign extension
235 * when the low bits are added at run time.
237 static bfd_reloc_status_type
238 mips_fix_hi16_s
PARAMS ((bfd
*, arelent
*, asymbol
*, PTR
,
239 asection
*, bfd
*, char **));
241 static bfd_reloc_status_type
242 mips_fix_hi16_s (abfd
, reloc_entry
, symbol
, data
, input_section
,
243 output_bfd
, error_message
)
245 arelent
*reloc_entry
;
248 asection
*input_section
;
250 char **error_message
;
254 /* If this is a partial relocation, just continue. */
255 if (output_bfd
!= (bfd
*)NULL
)
256 return bfd_reloc_continue
;
258 /* If this is an undefined symbol, return error */
259 if (symbol
->section
== &bfd_und_section
260 && (symbol
->flags
& BSF_WEAK
) == 0)
261 return bfd_reloc_undefined
;
264 * Work out which section the relocation is targetted at and the
265 * initial relocation command value.
267 if (bfd_is_com_section (symbol
->section
))
270 relocation
= symbol
->value
;
272 relocation
+= symbol
->section
->output_section
->vma
;
273 relocation
+= symbol
->section
->output_offset
;
274 relocation
+= reloc_entry
->addend
;
276 if (relocation
& 0x8000)
277 reloc_entry
->addend
+= 0x10000;
279 return bfd_reloc_continue
;
282 static reloc_howto_type mips_howto_table_ext
[] = {
283 {MIPS_RELOC_32
, 0, 2, 32, false, 0, complain_overflow_bitfield
, 0,
284 "32", false, 0, 0xffffffff, false},
285 {MIPS_RELOC_JMP
, 2, 2, 26, false, 0, complain_overflow_dont
,
287 "MIPS_JMP", false, 0, 0x03ffffff, false},
288 {MIPS_RELOC_WDISP16
, 2, 1, 16, true, 0, complain_overflow_signed
, 0,
289 "WDISP16", false, 0, 0x0000ffff, false},
290 {MIPS_RELOC_HI16
, 16, 1, 16, false, 0, complain_overflow_bitfield
, 0,
291 "HI16", false, 0, 0x0000ffff, false},
292 {MIPS_RELOC_HI16_S
, 16, 1, 16, false, 0, complain_overflow_bitfield
,
294 "HI16_S", false, 0, 0x0000ffff, false},
295 {MIPS_RELOC_LO16
, 0, 1, 16, false, 0, complain_overflow_dont
, 0,
296 "LO16", false, 0, 0x0000ffff, false},
299 static const reloc_howto_type
*
300 MY(reloc_howto_type_lookup
) (abfd
, code
)
302 bfd_reloc_code_real_type code
;
305 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, /* exec_hdr_flags */
380 PAGE_SIZE
, /* text vma */
382 0, /* text size includes exec header */
383 0, /* add_dynamic_symbols */
384 0, /* add_one_symbol */
385 0, /* link_dynamic_object */
386 0, /* write_dynamic_symbol */
387 0, /* check_dynamic_reloc */
388 0 /* finish_dynamic_link */
391 const bfd_target aout_mips_little_vec
=
393 "a.out-mips-little", /* name */
394 bfd_target_aout_flavour
,
395 false, /* target byte order (little) */
396 false, /* target headers byte order (little) */
397 (HAS_RELOC
| EXEC_P
| /* object flags */
398 HAS_LINENO
| HAS_DEBUG
|
399 HAS_SYMS
| HAS_LOCALS
| WP_TEXT
| D_PAGED
),
400 (SEC_HAS_CONTENTS
| SEC_ALLOC
| SEC_LOAD
| SEC_RELOC
), /* section flags */
401 MY_symbol_leading_char
,
402 ' ', /* ar_pad_char */
403 15, /* ar_max_namelen */
404 1, /* minimum alignment */
405 bfd_getl64
, bfd_getl_signed_64
, bfd_putl64
,
406 bfd_getl32
, bfd_getl_signed_32
, bfd_putl32
,
407 bfd_getl16
, bfd_getl_signed_16
, bfd_putl16
, /* data */
408 bfd_getl64
, bfd_getl_signed_64
, bfd_putl64
,
409 bfd_getl32
, bfd_getl_signed_32
, bfd_putl32
,
410 bfd_getl16
, bfd_getl_signed_16
, bfd_putl16
, /* hdrs */
411 {_bfd_dummy_target
, MY_object_p
, /* bfd_check_format */
412 bfd_generic_archive_p
, MY_core_file_p
},
413 {bfd_false
, MY_mkobject
, /* bfd_set_format */
414 _bfd_generic_mkarchive
, bfd_false
},
415 {bfd_false
, MY_write_object_contents
, /* bfd_write_contents */
416 _bfd_write_archive_contents
, bfd_false
},
418 BFD_JUMP_TABLE_GENERIC (MY
),
419 BFD_JUMP_TABLE_COPY (MY
),
420 BFD_JUMP_TABLE_CORE (MY
),
421 BFD_JUMP_TABLE_ARCHIVE (MY
),
422 BFD_JUMP_TABLE_SYMBOLS (MY
),
423 BFD_JUMP_TABLE_RELOCS (MY
),
424 BFD_JUMP_TABLE_WRITE (MY
),
425 BFD_JUMP_TABLE_LINK (MY
),
426 BFD_JUMP_TABLE_DYNAMIC (_bfd_nodynamic
),
428 (PTR
) MY_backend_data
,
431 const bfd_target aout_mips_big_vec
=
433 "a.out-mips-big", /* name */
434 bfd_target_aout_flavour
,
435 true, /* target byte order (big) */
436 true, /* target headers byte order (big) */
437 (HAS_RELOC
| EXEC_P
| /* object flags */
438 HAS_LINENO
| HAS_DEBUG
|
439 HAS_SYMS
| HAS_LOCALS
| WP_TEXT
| D_PAGED
),
440 (SEC_HAS_CONTENTS
| SEC_ALLOC
| SEC_LOAD
| SEC_RELOC
), /* section flags */
441 MY_symbol_leading_char
,
442 ' ', /* ar_pad_char */
443 15, /* ar_max_namelen */
444 1, /* minimum alignment */
445 bfd_getb64
, bfd_getb_signed_64
, bfd_putb64
,
446 bfd_getb32
, bfd_getb_signed_32
, bfd_putb32
,
447 bfd_getb16
, bfd_getb_signed_16
, bfd_putb16
, /* data */
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
, /* hdrs */
451 {_bfd_dummy_target
, MY_object_p
, /* bfd_check_format */
452 bfd_generic_archive_p
, MY_core_file_p
},
453 {bfd_false
, MY_mkobject
, /* bfd_set_format */
454 _bfd_generic_mkarchive
, bfd_false
},
455 {bfd_false
, MY_write_object_contents
, /* bfd_write_contents */
456 _bfd_write_archive_contents
, bfd_false
},
458 BFD_JUMP_TABLE_GENERIC (MY
),
459 BFD_JUMP_TABLE_COPY (MY
),
460 BFD_JUMP_TABLE_CORE (MY
),
461 BFD_JUMP_TABLE_ARCHIVE (MY
),
462 BFD_JUMP_TABLE_SYMBOLS (MY
),
463 BFD_JUMP_TABLE_RELOCS (MY
),
464 BFD_JUMP_TABLE_WRITE (MY
),
465 BFD_JUMP_TABLE_LINK (MY
),
466 BFD_JUMP_TABLE_DYNAMIC (_bfd_nodynamic
),
468 (PTR
) MY_backend_data
,