1 /* BFD backend for MIPS BSD (a.out) binaries.
2 Copyright (C) 1993 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_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)) {
131 N_SET_MACHTYPE(*execp, M_68010);
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_HI16_S relocation.
182 * We need to see if bit 15 is set in the result. If it is, we add
183 * 0x10000 and continue normally. This will compensate for the sign extension
184 * when the low bits are added at run time.
186 static bfd_reloc_status_type
187 mips_fix_hi16_s PARAMS ((bfd *, arelent *, asymbol *, PTR,
188 asection *, bfd *, char **));
190 static bfd_reloc_status_type
191 mips_fix_hi16_s (abfd, reloc_entry, symbol, data, input_section,
192 output_bfd, error_message)
194 arelent *reloc_entry;
197 asection *input_section;
199 char **error_message;
203 /* If this is a partial relocation, just continue. */
204 if (output_bfd != (bfd *)NULL)
205 return bfd_reloc_continue;
208 * Work out which section the relocation is targetted at and the
209 * initial relocation command value.
211 if (symbol->section == &bfd_com_section)
214 relocation = symbol->value;
216 relocation += symbol->section->output_section->vma;
217 relocation += symbol->section->output_offset;
218 relocation += reloc_entry->addend;
220 if (relocation & 0x8000)
221 reloc_entry->addend += 0x10000;
223 return bfd_reloc_continue;
226 static reloc_howto_type mips_howto_table_ext[] = {
227 {MIPS_RELOC_32, 0, 2, 32, false, 0, complain_overflow_bitfield, 0,
228 "32", false, 0, 0xffffffff, false},
229 {MIPS_RELOC_JMP, 2, 2, 26, false, 0, complain_overflow_bitfield, 0,
230 "MIPS_JMP", false, 0, 0x03ffffff, false},
231 {MIPS_RELOC_WDISP16, 2, 1, 16, true, 0, complain_overflow_signed, 0,
232 "WDISP16", false, 0, 0x0000ffff, false},
233 {MIPS_RELOC_HI16, 16, 1, 16, false, 0, complain_overflow_bitfield, 0,
234 "HI16", false, 0, 0x0000ffff, false},
235 {MIPS_RELOC_HI16_S, 16, 1, 16, false, 0, complain_overflow_bitfield,
237 "HI16_S", false, 0, 0x0000ffff, false},
238 {MIPS_RELOC_LO16, 0, 1, 16, false, 0, complain_overflow_dont, 0,
239 "LO16", false, 0, 0x0000ffff, false},
242 static const reloc_howto_type *
243 MY(reloc_howto_type_lookup) (abfd, code)
245 bfd_reloc_code_real_type code;
248 if (bfd_get_arch (abfd) != bfd_arch_mips)
254 return (&mips_howto_table_ext[MIPS_RELOC_32]);
255 case BFD_RELOC_MIPS_JMP:
256 return (&mips_howto_table_ext[MIPS_RELOC_JMP]);
257 case BFD_RELOC_16_PCREL_S2:
258 return (&mips_howto_table_ext[MIPS_RELOC_WDISP16]);
260 return (&mips_howto_table_ext[MIPS_RELOC_HI16]);
261 case BFD_RELOC_HI16_S:
262 return (&mips_howto_table_ext[MIPS_RELOC_HI16_S]);
264 return (&mips_howto_table_ext[MIPS_RELOC_LO16]);
271 * This is just like the standard aoutx.h version but we need to do our
272 * own mapping of external reloc type values to howto entries.
275 MY(canonicalize_reloc)(abfd, section, relptr, symbols)
281 arelent *tblptr = section->relocation;
282 unsigned int count, c;
283 extern reloc_howto_type NAME(aout,ext_howto_table)[];
285 /* If we have already read in the relocation table, return the values. */
286 if (section->flags & SEC_CONSTRUCTOR) {
287 arelent_chain *chain = section->constructor_chain;
289 for (count = 0; count < section->reloc_count; count++) {
290 *relptr++ = &chain->relent;
294 return section->reloc_count;
296 if (tblptr && section->reloc_count) {
297 for (count = 0; count++ < section->reloc_count;)
298 *relptr++ = tblptr++;
300 return section->reloc_count;
303 if (!NAME(aout,slurp_reloc_table)(abfd, section, symbols))
305 tblptr = section->relocation;
307 /* fix up howto entries */
308 for (count = 0; count++ < section->reloc_count;)
310 c = tblptr->howto - NAME(aout,ext_howto_table);
311 tblptr->howto = &mips_howto_table_ext[c];
313 *relptr++ = tblptr++;
316 return section->reloc_count;
319 static CONST struct aout_backend_data MY(backend_data) = {
320 0, /* zmagic contiguous */
321 1, /* text incl header */
322 PAGE_SIZE, /* text vma */
324 0, /* text size includes exec header */
327 bfd_target aout_mips_little_vec =
329 "a.out-mips-little", /* name */
330 bfd_target_aout_flavour,
331 false, /* target byte order (little) */
332 false, /* target headers byte order (little) */
333 (HAS_RELOC | EXEC_P | /* object flags */
334 HAS_LINENO | HAS_DEBUG |
335 HAS_SYMS | HAS_LOCALS | WP_TEXT | D_PAGED),
336 (SEC_HAS_CONTENTS | SEC_ALLOC | SEC_LOAD | SEC_RELOC), /* section flags */
337 MY_symbol_leading_char,
338 ' ', /* ar_pad_char */
339 15, /* ar_max_namelen */
340 1, /* minimum alignment */
341 bfd_getl64, bfd_getl_signed_64, bfd_putl64,
342 bfd_getl32, bfd_getl_signed_32, bfd_putl32,
343 bfd_getl16, bfd_getl_signed_16, bfd_putl16, /* data */
344 bfd_getl64, bfd_getl_signed_64, bfd_putl64,
345 bfd_getl32, bfd_getl_signed_32, bfd_putl32,
346 bfd_getl16, bfd_getl_signed_16, bfd_putl16, /* hdrs */
347 {_bfd_dummy_target, MY_object_p, /* bfd_check_format */
348 bfd_generic_archive_p, MY_core_file_p},
349 {bfd_false, MY_mkobject, /* bfd_set_format */
350 _bfd_generic_mkarchive, bfd_false},
351 {bfd_false, MY_write_object_contents, /* bfd_write_contents */
352 _bfd_write_archive_contents, bfd_false},
354 BFD_JUMP_TABLE_GENERIC (MY),
355 BFD_JUMP_TABLE_COPY (MY),
356 BFD_JUMP_TABLE_CORE (MY),
357 BFD_JUMP_TABLE_ARCHIVE (MY),
358 BFD_JUMP_TABLE_SYMBOLS (MY),
359 BFD_JUMP_TABLE_RELOCS (MY),
360 BFD_JUMP_TABLE_WRITE (MY),
361 BFD_JUMP_TABLE_LINK (MY),
363 (PTR) MY_backend_data,
366 bfd_target aout_mips_big_vec =
368 "a.out-mips-big", /* name */
369 bfd_target_aout_flavour,
370 true, /* target byte order (big) */
371 true, /* target headers byte order (big) */
372 (HAS_RELOC | EXEC_P | /* object flags */
373 HAS_LINENO | HAS_DEBUG |
374 HAS_SYMS | HAS_LOCALS | WP_TEXT | D_PAGED),
375 (SEC_HAS_CONTENTS | SEC_ALLOC | SEC_LOAD | SEC_RELOC), /* section flags */
376 MY_symbol_leading_char,
377 ' ', /* ar_pad_char */
378 15, /* ar_max_namelen */
379 1, /* minimum alignment */
380 bfd_getb64, bfd_getb_signed_64, bfd_putb64,
381 bfd_getb32, bfd_getb_signed_32, bfd_putb32,
382 bfd_getb16, bfd_getb_signed_16, bfd_putb16, /* data */
383 bfd_getb64, bfd_getb_signed_64, bfd_putb64,
384 bfd_getb32, bfd_getb_signed_32, bfd_putb32,
385 bfd_getb16, bfd_getb_signed_16, bfd_putb16, /* hdrs */
386 {_bfd_dummy_target, MY_object_p, /* bfd_check_format */
387 bfd_generic_archive_p, MY_core_file_p},
388 {bfd_false, MY_mkobject, /* bfd_set_format */
389 _bfd_generic_mkarchive, bfd_false},
390 {bfd_false, MY_write_object_contents, /* bfd_write_contents */
391 _bfd_write_archive_contents, bfd_false},
393 BFD_JUMP_TABLE_GENERIC (MY),
394 BFD_JUMP_TABLE_COPY (MY),
395 BFD_JUMP_TABLE_CORE (MY),
396 BFD_JUMP_TABLE_ARCHIVE (MY),
397 BFD_JUMP_TABLE_SYMBOLS (MY),
398 BFD_JUMP_TABLE_RELOCS (MY),
399 BFD_JUMP_TABLE_WRITE (MY),
400 BFD_JUMP_TABLE_LINK (MY),
402 (PTR) MY_backend_data,