1 /* BFD back-end for Intel 960 COFF files.
2 Copyright (C) 1990, 1991, 1992, 1993, 1994 Free Software Foundation, Inc.
3 Written by Cygnus Support.
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. */
22 #define BADMAG(x) I960BADMAG(x)
28 #include "coff/i960.h"
29 #include "coff/internal.h"
30 #include "libcoff.h" /* to allow easier abstraction-breaking */
32 static bfd_reloc_status_type optcall_callback
33 PARAMS ((bfd *, arelent *, asymbol *, PTR, asection *, bfd *, char **));
34 static bfd_reloc_status_type coff_i960_relocate
35 PARAMS ((bfd *, arelent *, asymbol *, PTR, asection *, bfd *, char **));
37 #define COFF_LONG_FILENAMES
39 #define CALLS 0x66003800 /* Template for 'calls' instruction */
40 #define BAL 0x0b000000 /* Template for 'bal' instruction */
41 #define BAL_MASK 0x00ffffff
43 static bfd_reloc_status_type
44 optcall_callback (abfd, reloc_entry, symbol_in, data,
45 ignore_input_section, ignore_bfd, error_message)
50 asection *ignore_input_section;
54 /* This item has already been relocated correctly, but we may be
55 * able to patch in yet better code - done by digging out the
56 * correct info on this symbol */
57 bfd_reloc_status_type result;
58 coff_symbol_type *cs = coffsymbol(symbol_in);
60 /* So the target symbol has to be of coff type, and the symbol
61 has to have the correct native information within it */
62 if ((bfd_asymbol_flavour(&cs->symbol) != bfd_target_coff_flavour)
63 || (cs->native == (combined_entry_type *)NULL))
65 /* This is interesting, consider the case where we're outputting coff
66 from a mix n match input, linking from coff to a symbol defined in a
67 bout file will cause this match to be true. Should I complain? This
68 will only work if the bout symbol is non leaf. */
70 (char *) "uncertain calling convention for non-COFF symbol";
71 result = bfd_reloc_dangerous;
75 switch (cs->native->u.syment.n_sclass)
79 /* This is a call to a leaf procedure, replace instruction with a bal
80 to the correct location. */
82 union internal_auxent *aux = &((cs->native+2)->u.auxent);
83 int word = bfd_get_32(abfd, (bfd_byte *)data + reloc_entry->address);
84 int olf = (aux->x_bal.x_balntry - cs->native->u.syment.n_value);
85 BFD_ASSERT(cs->native->u.syment.n_numaux==2);
87 /* We replace the original call instruction with a bal to
88 the bal entry point - the offset of which is described in
89 the 2nd auxent of the original symbol. We keep the native
90 sym and auxents untouched, so the delta between the two
91 is the offset of the bal entry point. */
92 word = ((word + olf) & BAL_MASK) | BAL;
93 bfd_put_32(abfd, word, (bfd_byte *) data + reloc_entry->address);
95 result = bfd_reloc_ok;
98 /* This is a call to a system call, replace with a calls to # */
100 result = bfd_reloc_ok;
103 result = bfd_reloc_ok;
110 /* i960 COFF is used by VxWorks 5.1. However, VxWorks 5.1 does not
111 appear to correctly handle a reloc against a symbol defined in the
112 same object file. It appears to simply discard such relocs, rather
113 than adding their values into the object file. We handle this here
114 by converting all relocs against defined symbols into relocs
115 against the section symbol, when generating a relocateable output
118 static bfd_reloc_status_type
119 coff_i960_relocate (abfd, reloc_entry, symbol, data, input_section,
120 output_bfd, error_message)
122 arelent *reloc_entry;
125 asection *input_section;
127 char **error_message;
129 const char *sec_name;
130 asymbol **syms, **sym_end;
132 if (output_bfd == NULL)
134 /* Not generating relocateable output file. */
135 return bfd_reloc_continue;
138 if (bfd_is_und_section (bfd_get_section (symbol)))
140 /* Symbol is not defined, so no need to worry about it. */
141 return bfd_reloc_continue;
144 /* Convert the reloc to use the section symbol. FIXME: This method
146 sec_name = bfd_get_section_name (output_bfd,
147 bfd_get_section (symbol)->output_section);
148 syms = bfd_get_outsymbols (output_bfd);
149 sym_end = syms + bfd_get_symcount (output_bfd);
150 for (; syms < sym_end; syms++)
152 if (bfd_asymbol_name (*syms) != NULL
153 && strcmp (bfd_asymbol_name (*syms), sec_name) == 0
154 && (*syms)->value == 0)
156 reloc_entry->sym_ptr_ptr = syms;
164 /* Let bfd_perform_relocation do its thing, which will include
165 stuffing the symbol addend into the object file. */
166 return bfd_reloc_continue;
169 static reloc_howto_type howto_rellong =
170 HOWTO ((unsigned int) R_RELLONG, 0, 2, 32,false, 0,
171 complain_overflow_bitfield, coff_i960_relocate,"rellong", true,
172 0xffffffff, 0xffffffff, 0);
173 static reloc_howto_type howto_iprmed =
174 HOWTO (R_IPRMED, 0, 2, 24,true,0, complain_overflow_signed,
175 coff_i960_relocate, "iprmed ", true, 0x00ffffff, 0x00ffffff, 0);
176 static reloc_howto_type howto_optcall =
177 HOWTO (R_OPTCALL, 0,2,24,true,0, complain_overflow_signed,
178 optcall_callback, "optcall", true, 0x00ffffff, 0x00ffffff, 0);
180 static const reloc_howto_type *
181 coff_i960_reloc_type_lookup (abfd, code)
183 bfd_reloc_code_real_type code;
189 case BFD_RELOC_I960_CALLJ:
190 return &howto_optcall;
193 return &howto_rellong;
194 case BFD_RELOC_24_PCREL:
195 return &howto_iprmed;
199 /* The real code is in coffcode.h */
201 #define RTYPE2HOWTO(cache_ptr, dst) \
203 reloc_howto_type *howto_ptr; \
204 switch ((dst)->r_type) { \
205 case 17: howto_ptr = &howto_rellong; break; \
206 case 25: howto_ptr = &howto_iprmed; break; \
207 case 27: howto_ptr = &howto_optcall; break; \
208 default: howto_ptr = 0; break; \
210 cache_ptr->howto = howto_ptr; \
213 #include "coffcode.h"
215 #undef coff_bfd_reloc_type_lookup
216 #define coff_bfd_reloc_type_lookup coff_i960_reloc_type_lookup
218 const bfd_target icoff_little_vec =
220 "coff-Intel-little", /* name */
221 bfd_target_coff_flavour,
222 false, /* data byte order is little */
223 false, /* header byte order is little */
225 (HAS_RELOC | EXEC_P | /* object flags */
226 HAS_LINENO | HAS_DEBUG |
227 HAS_SYMS | HAS_LOCALS | WP_TEXT),
229 (SEC_HAS_CONTENTS | SEC_ALLOC | SEC_LOAD | SEC_RELOC), /* section flags */
230 '_', /* leading underscore */
231 '/', /* ar_pad_char */
232 15, /* ar_max_namelen */
234 3, /* minimum alignment power */
235 bfd_getl64, bfd_getl_signed_64, bfd_putl64,
236 bfd_getl32, bfd_getl_signed_32, bfd_putl32,
237 bfd_getl16, bfd_getl_signed_16, bfd_putl16, /* data */
238 bfd_getl64, bfd_getl_signed_64, bfd_putl64,
239 bfd_getl32, bfd_getl_signed_32, bfd_putl32,
240 bfd_getl16, bfd_getl_signed_16, bfd_putl16, /* hdrs */
242 {_bfd_dummy_target, coff_object_p, /* bfd_check_format */
243 bfd_generic_archive_p, _bfd_dummy_target},
244 {bfd_false, coff_mkobject, /* bfd_set_format */
245 _bfd_generic_mkarchive, bfd_false},
246 {bfd_false, coff_write_object_contents, /* bfd_write_contents */
247 _bfd_write_archive_contents, bfd_false},
249 BFD_JUMP_TABLE_GENERIC (coff),
250 BFD_JUMP_TABLE_COPY (coff),
251 BFD_JUMP_TABLE_CORE (_bfd_nocore),
252 BFD_JUMP_TABLE_ARCHIVE (_bfd_archive_coff),
253 BFD_JUMP_TABLE_SYMBOLS (coff),
254 BFD_JUMP_TABLE_RELOCS (coff),
255 BFD_JUMP_TABLE_WRITE (coff),
256 BFD_JUMP_TABLE_LINK (coff),
257 BFD_JUMP_TABLE_DYNAMIC (_bfd_nodynamic),
263 const bfd_target icoff_big_vec =
265 "coff-Intel-big", /* name */
266 bfd_target_coff_flavour,
267 false, /* data byte order is little */
268 true, /* header byte order is big */
270 (HAS_RELOC | EXEC_P | /* object flags */
271 HAS_LINENO | HAS_DEBUG |
272 HAS_SYMS | HAS_LOCALS | WP_TEXT),
274 (SEC_HAS_CONTENTS | SEC_ALLOC | SEC_LOAD | SEC_RELOC), /* section flags */
275 '_', /* leading underscore */
276 '/', /* ar_pad_char */
277 15, /* ar_max_namelen */
279 3, /* minimum alignment power */
280 bfd_getl64, bfd_getl_signed_64, bfd_putl64,
281 bfd_getl32, bfd_getl_signed_32, bfd_putl32,
282 bfd_getl16, bfd_getl_signed_16, bfd_putl16, /* data */
283 bfd_getb64, bfd_getb_signed_64, bfd_putb64,
284 bfd_getb32, bfd_getb_signed_32, bfd_putb32,
285 bfd_getb16, bfd_getb_signed_16, bfd_putb16, /* hdrs */
287 {_bfd_dummy_target, coff_object_p, /* bfd_check_format */
288 bfd_generic_archive_p, _bfd_dummy_target},
289 {bfd_false, coff_mkobject, /* bfd_set_format */
290 _bfd_generic_mkarchive, bfd_false},
291 {bfd_false, coff_write_object_contents, /* bfd_write_contents */
292 _bfd_write_archive_contents, bfd_false},
294 BFD_JUMP_TABLE_GENERIC (coff),
295 BFD_JUMP_TABLE_COPY (coff),
296 BFD_JUMP_TABLE_CORE (_bfd_nocore),
297 BFD_JUMP_TABLE_ARCHIVE (_bfd_archive_coff),
298 BFD_JUMP_TABLE_SYMBOLS (coff),
299 BFD_JUMP_TABLE_RELOCS (coff),
300 BFD_JUMP_TABLE_WRITE (coff),
301 BFD_JUMP_TABLE_LINK (coff),
302 BFD_JUMP_TABLE_DYNAMIC (_bfd_nodynamic),