1/* BFD back-end for os9000 i386 binaries.
2   Copyright 1990, 1991, 1992, 1993, 1994, 1995, 1998, 1999, 2001, 2002,
3   2004, 2005, 2006 Free Software Foundation, Inc.
4   Written by Cygnus Support.
5
6This file is part of BFD, the Binary File Descriptor library.
7
8This program is free software; you can redistribute it and/or modify
9it under the terms of the GNU General Public License as published by
10the Free Software Foundation; either version 2 of the License, or
11(at your option) any later version.
12
13This program is distributed in the hope that it will be useful,
14but WITHOUT ANY WARRANTY; without even the implied warranty of
15MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
16GNU General Public License for more details.
17
18You should have received a copy of the GNU General Public License
19along with this program; if not, write to the Free Software
20Foundation, Inc., 51 Franklin Street - Fifth Floor, Boston, MA 02110-1301, USA.  */
21
22
23#include "bfd.h"
24#include "sysdep.h"
25#include "libbfd.h"
26#include "bfdlink.h"
27#include "libaout.h"		/* BFD a.out internal data structures */
28#include "os9k.h"
29
30/* Swaps the information in an executable header taken from a raw byte
31   stream memory image, into the internal exec_header structure.  */
32static bfd_boolean
33os9k_swap_exec_header_in (bfd *abfd,
34			  mh_com *raw_bytes,
35			  struct internal_exec *execp)
36{
37  mh_com *bytes = (mh_com *) raw_bytes;
38  unsigned int dload, dmemsize, dmemstart;
39
40  /* Now fill in fields in the execp, from the bytes in the raw data.  */
41  execp->a_info = H_GET_16 (abfd, bytes->m_sync);
42  execp->a_syms = 0;
43  execp->a_entry = H_GET_32 (abfd, bytes->m_exec);
44  execp->a_talign = 2;
45  execp->a_dalign = 2;
46  execp->a_balign = 2;
47
48  dload = H_GET_32 (abfd, bytes->m_idata);
49  execp->a_data = dload + 8;
50
51  if (bfd_seek (abfd, (file_ptr) dload, SEEK_SET) != 0
52      || (bfd_bread (&dmemstart, (bfd_size_type) sizeof (dmemstart), abfd)
53	  != sizeof (dmemstart))
54      || (bfd_bread (&dmemsize, (bfd_size_type) sizeof (dmemsize), abfd)
55	  != sizeof (dmemsize)))
56    return FALSE;
57
58  execp->a_tload = 0;
59  execp->a_dload = H_GET_32 (abfd, (unsigned char *) &dmemstart);
60  execp->a_text = dload - execp->a_tload;
61  execp->a_data = H_GET_32 (abfd, (unsigned char *) &dmemsize);
62  execp->a_bss = H_GET_32 (abfd, bytes->m_data) - execp->a_data;
63
64  execp->a_trsize = 0;
65  execp->a_drsize = 0;
66
67  return TRUE;
68}
69
70
71/* Finish up the opening of a b.out file for reading.  Fill in all the
72   fields that are not handled by common code.  */
73
74static const bfd_target *
75os9k_callback (bfd *abfd)
76{
77  struct internal_exec *execp = exec_hdr (abfd);
78  unsigned long bss_start;
79
80  /* Architecture and machine type.  */
81  bfd_set_arch_mach (abfd, bfd_arch_i386, 0);
82
83  /* The positions of the string table and symbol table.  */
84  obj_str_filepos (abfd) = 0;
85  obj_sym_filepos (abfd) = 0;
86
87  /* The alignments of the sections.  */
88  obj_textsec (abfd)->alignment_power = execp->a_talign;
89  obj_datasec (abfd)->alignment_power = execp->a_dalign;
90  obj_bsssec (abfd)->alignment_power = execp->a_balign;
91
92  /* The starting addresses of the sections.  */
93  obj_textsec (abfd)->vma = execp->a_tload;
94  obj_datasec (abfd)->vma = execp->a_dload;
95
96  /* And reload the sizes, since the aout module zaps them.  */
97  obj_textsec (abfd)->size = execp->a_text;
98
99  bss_start = execp->a_dload + execp->a_data;	/* BSS = end of data section.  */
100  obj_bsssec (abfd)->vma = align_power (bss_start, execp->a_balign);
101
102  /* The file positions of the sections.  */
103  obj_textsec (abfd)->filepos = execp->a_entry;
104  obj_datasec (abfd)->filepos = execp->a_dload;
105
106  /* The file positions of the relocation info ***
107  obj_textsec (abfd)->rel_filepos = N_TROFF(*execp);
108  obj_datasec (abfd)->rel_filepos =  N_DROFF(*execp);  */
109
110  adata (abfd).page_size = 1;	/* Not applicable.  */
111  adata (abfd).segment_size = 1;/* Not applicable.  */
112  adata (abfd).exec_bytes_size = MHCOM_BYTES_SIZE;
113
114  return abfd->xvec;
115}
116
117static const bfd_target *
118os9k_object_p (bfd *abfd)
119{
120  struct internal_exec anexec;
121  mh_com exec_bytes;
122
123  if (bfd_bread ((PTR) &exec_bytes, (bfd_size_type) MHCOM_BYTES_SIZE, abfd)
124      != MHCOM_BYTES_SIZE)
125    {
126      if (bfd_get_error () != bfd_error_system_call)
127	bfd_set_error (bfd_error_wrong_format);
128      return 0;
129    }
130
131  anexec.a_info = H_GET_16 (abfd, exec_bytes.m_sync);
132  if (N_BADMAG (anexec))
133    {
134      bfd_set_error (bfd_error_wrong_format);
135      return 0;
136    }
137
138  if (! os9k_swap_exec_header_in (abfd, &exec_bytes, &anexec))
139    {
140      if (bfd_get_error () != bfd_error_system_call)
141	bfd_set_error (bfd_error_wrong_format);
142      return NULL;
143    }
144  return aout_32_some_aout_object_p (abfd, &anexec, os9k_callback);
145}
146
147static int
148os9k_sizeof_headers (bfd *abfd ATTRIBUTE_UNUSED,
149		     struct bfd_link_info *info ATTRIBUTE_UNUSED)
150{
151  return sizeof (struct internal_exec);
152}
153
154
155
156#define aout_32_close_and_cleanup aout_32_bfd_free_cached_info
157
158#define aout_32_bfd_make_debug_symbol _bfd_nosymbols_bfd_make_debug_symbol
159
160#define aout_32_bfd_reloc_type_lookup _bfd_norelocs_bfd_reloc_type_lookup
161
162#define aout_32_get_section_contents_in_window \
163  _bfd_generic_get_section_contents_in_window
164
165#define os9k_bfd_get_relocated_section_contents \
166  bfd_generic_get_relocated_section_contents
167#define os9k_bfd_relax_section bfd_generic_relax_section
168#define os9k_bfd_gc_sections bfd_generic_gc_sections
169#define os9k_bfd_merge_sections bfd_generic_merge_sections
170#define os9k_bfd_is_group_section bfd_generic_is_group_section
171#define os9k_bfd_discard_group bfd_generic_discard_group
172#define os9k_section_already_linked \
173  _bfd_generic_section_already_linked
174#define os9k_bfd_link_hash_table_create _bfd_generic_link_hash_table_create
175#define os9k_bfd_link_hash_table_free _bfd_generic_link_hash_table_free
176#define os9k_bfd_link_add_symbols _bfd_generic_link_add_symbols
177#define os9k_bfd_link_just_syms _bfd_generic_link_just_syms
178#define os9k_bfd_final_link _bfd_generic_final_link
179#define os9k_bfd_link_split_section  _bfd_generic_link_split_section
180
181const bfd_target i386os9k_vec =
182  {
183    "i386os9k",			/* name */
184    bfd_target_os9k_flavour,
185    BFD_ENDIAN_LITTLE,		/* data byte order is little */
186    BFD_ENDIAN_LITTLE,		/* hdr byte order is little */
187    (HAS_RELOC | EXEC_P | WP_TEXT),	/* object flags */
188    (SEC_HAS_CONTENTS | SEC_ALLOC | SEC_LOAD),	/* section flags */
189    0,				/* symbol leading char */
190    ' ',				/* ar_pad_char */
191    16,				/* ar_max_namelen */
192
193    bfd_getl64, bfd_getl_signed_64, bfd_putl64,
194    bfd_getl32, bfd_getl_signed_32, bfd_putl32,
195    bfd_getl16, bfd_getl_signed_16, bfd_putl16,	/* data */
196    bfd_getl64, bfd_getl_signed_64, bfd_putl64,
197    bfd_getl32, bfd_getl_signed_32, bfd_putl32,
198    bfd_getl16, bfd_getl_signed_16, bfd_putl16,	/* hdrs */
199    {_bfd_dummy_target, os9k_object_p,	/* bfd_check_format */
200     bfd_generic_archive_p, _bfd_dummy_target},
201    {bfd_false, bfd_false,	/* bfd_set_format */
202     _bfd_generic_mkarchive, bfd_false},
203    {bfd_false, bfd_false,	/* bfd_write_contents */
204     _bfd_write_archive_contents, bfd_false},
205
206    BFD_JUMP_TABLE_GENERIC (aout_32),
207    BFD_JUMP_TABLE_COPY (_bfd_generic),
208    BFD_JUMP_TABLE_CORE (_bfd_nocore),
209    BFD_JUMP_TABLE_ARCHIVE (_bfd_archive_bsd),
210    BFD_JUMP_TABLE_SYMBOLS (aout_32),
211    BFD_JUMP_TABLE_RELOCS (aout_32),
212    BFD_JUMP_TABLE_WRITE (aout_32),
213    BFD_JUMP_TABLE_LINK (os9k),
214    BFD_JUMP_TABLE_DYNAMIC (_bfd_nodynamic),
215
216    NULL,
217
218    (PTR) 0,
219  };
220