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[binutils.git] / bfd / aout-encap.c
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1 /* BFD back-end for a.out files encapsulated with COFF headers.
2 Copyright 1990, 1991, 1994, 1995, 2000, 2001, 2002, 2003
3 Free Software Foundation, Inc.
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., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA. */
21 /* THIS MODULE IS NOT FINISHED. IT PROBABLY DOESN'T EVEN COMPILE. */
23 #if 0
24 #define TARGET_PAGE_SIZE 4096
25 #define SEGMENT_SIZE TARGET_PAGE_SIZE
26 #define TEXT_START_ADDR 0
27 #endif
29 #include "bfd.h"
30 #include "sysdep.h"
31 #include "libbfd.h"
32 #include "aout/aout64.h"
33 #include "aout/stab_gnu.h"
34 #include "aout/ar.h"
35 #include "libaout.h" /* BFD a.out internal data structures */
37 const bfd_target *encap_real_callback ();
39 const bfd_target *
40 encap_object_p (abfd)
41 bfd *abfd;
43 unsigned char magicbuf[4]; /* Raw bytes of magic number from file */
44 unsigned long magic; /* Swapped magic number */
45 short coff_magic;
46 struct external_exec exec_bytes;
47 struct internal_exec exec;
48 bfd_size_type amt = sizeof (magicbuf);
50 if (bfd_bread ((PTR) magicbuf, amt, abfd) != amt)
52 if (bfd_get_error () != bfd_error_system_call)
53 bfd_set_error (bfd_error_wrong_format);
54 return 0;
57 coff_magic = H_GET_16 (abfd, magicbuf);
58 if (coff_magic != COFF_MAGIC)
59 return 0; /* Not an encap coff file */
61 magic = H_GET_32 (abfd, magicbuf);
63 if (N_BADMAG (*((struct internal_exec *) &magic)))
64 return 0;
66 if (bfd_seek (abfd, (file_ptr) sizeof (struct coffheader), SEEK_SET) != 0)
67 return 0;
69 amt = EXEC_BYTES_SIZE;
70 if (bfd_bread ((PTR) &exec_bytes, amt, abfd) != amt)
72 if (bfd_get_error () != bfd_error_system_call)
73 bfd_set_error (bfd_error_wrong_format);
74 return 0;
76 NAME(aout,swap_exec_header_in) (abfd, &exec_bytes, &exec);
78 return aout_32_some_aout_object_p (abfd, &exec, encap_realcallback);
81 /* Finish up the reading of an encapsulated-coff a.out file header. */
82 const bfd_target *
83 encap_real_callback (abfd)
84 bfd *abfd;
86 struct internal_exec *execp = exec_hdr (abfd);
88 MY(callback) (abfd, execp);
90 /* If we have a coff header, it can give us better values for
91 text_start and exec_data_start. This is particularly useful
92 for remote debugging of embedded systems. */
93 if (N_FLAGS(exec_aouthdr) & N_FLAGS_COFF_ENCAPSULATE)
95 struct coffheader ch;
96 int val;
97 val = lseek (execchan, -(sizeof (AOUTHDR) + sizeof (ch)), 1);
98 if (val == -1)
99 perror_with_name (filename);
100 val = myread (execchan, &ch, sizeof (ch));
101 if (val < 0)
102 perror_with_name (filename);
103 text_start = ch.text_start;
104 exec_data_start = ch.data_start;
106 else
108 text_start =
109 IS_OBJECT_FILE (exec_aouthdr) ? 0 : N_TXTADDR (exec_aouthdr);
110 exec_data_start = (IS_OBJECT_FILE (exec_aouthdr)
111 ? exec_aouthdr.a_text
112 : N_DATADDR (exec_aouthdr));
115 /* Determine the architecture and machine type of the object file. */
116 bfd_default_set_arch_mach(abfd, bfd_arch_m68k, 0); /* FIXME */
118 return abfd->xvec;
121 /* Write an object file in Encapsulated COFF format.
122 Section contents have already been written. We write the
123 file header, symbols, and relocation. */
125 bfd_boolean
126 encap_write_object_contents (abfd)
127 bfd *abfd;
129 bfd_size_type data_pad = 0;
130 struct external_exec exec_bytes;
131 struct internal_exec *execp = exec_hdr (abfd);
133 /* FIXME: Fragments from the old GNU LD program for dealing with
134 encap coff. */
135 struct coffheader coffheader;
136 int need_coff_header;
138 /* Determine whether to count the header as part of
139 the text size, and initialize the text size accordingly.
140 This depends on the kind of system and on the output format selected. */
142 N_SET_MAGIC (outheader, magic);
143 #ifdef INITIALIZE_HEADER
144 INITIALIZE_HEADER;
145 #endif
147 text_size = sizeof (struct exec);
148 #ifdef COFF_ENCAPSULATE
149 if (relocatable_output == 0 && file_table[0].just_syms_flag == 0)
151 need_coff_header = 1;
152 /* set this flag now, since it will change the values of N_TXTOFF, etc */
153 N_SET_FLAGS (outheader, aout_backend_info (abfd)->exec_hdr_flags);
154 text_size += sizeof (struct coffheader);
156 #endif
158 #ifdef COFF_ENCAPSULATE
159 if (need_coff_header)
161 /* We are encapsulating BSD format within COFF format. */
162 struct coffscn *tp, *dp, *bp;
164 tp = &coffheader.scns[0];
165 dp = &coffheader.scns[1];
166 bp = &coffheader.scns[2];
168 strcpy (tp->s_name, ".text");
169 tp->s_paddr = text_start;
170 tp->s_vaddr = text_start;
171 tp->s_size = text_size;
172 tp->s_scnptr = sizeof (struct coffheader) + sizeof (struct exec);
173 tp->s_relptr = 0;
174 tp->s_lnnoptr = 0;
175 tp->s_nreloc = 0;
176 tp->s_nlnno = 0;
177 tp->s_flags = 0x20;
178 strcpy (dp->s_name, ".data");
179 dp->s_paddr = data_start;
180 dp->s_vaddr = data_start;
181 dp->s_size = data_size;
182 dp->s_scnptr = tp->s_scnptr + tp->s_size;
183 dp->s_relptr = 0;
184 dp->s_lnnoptr = 0;
185 dp->s_nreloc = 0;
186 dp->s_nlnno = 0;
187 dp->s_flags = 0x40;
188 strcpy (bp->s_name, ".bss");
189 bp->s_paddr = dp->s_vaddr + dp->s_size;
190 bp->s_vaddr = bp->s_paddr;
191 bp->s_size = bss_size;
192 bp->s_scnptr = 0;
193 bp->s_relptr = 0;
194 bp->s_lnnoptr = 0;
195 bp->s_nreloc = 0;
196 bp->s_nlnno = 0;
197 bp->s_flags = 0x80;
199 coffheader.f_magic = COFF_MAGIC;
200 coffheader.f_nscns = 3;
201 /* store an unlikely time so programs can
202 * tell that there is a bsd header
204 coffheader.f_timdat = 1;
205 coffheader.f_symptr = 0;
206 coffheader.f_nsyms = 0;
207 coffheader.f_opthdr = 28;
208 coffheader.f_flags = 0x103;
209 /* aouthdr */
210 coffheader.magic = ZMAGIC;
211 coffheader.vstamp = 0;
212 coffheader.tsize = tp->s_size;
213 coffheader.dsize = dp->s_size;
214 coffheader.bsize = bp->s_size;
215 coffheader.entry = outheader.a_entry;
216 coffheader.text_start = tp->s_vaddr;
217 coffheader.data_start = dp->s_vaddr;
219 #endif
221 #ifdef COFF_ENCAPSULATE
222 if (need_coff_header)
223 mywrite (&coffheader, sizeof coffheader, 1, outdesc);
224 #endif
226 #ifndef COFF_ENCAPSULATE
227 padfile (N_TXTOFF (outheader) - sizeof outheader, outdesc);
228 #endif
230 text_size -= N_TXTOFF (outheader);
231 WRITE_HEADERS(abfd, execp);
232 return TRUE;
235 #define MY_write_object_content encap_write_object_contents
236 #define MY_object_p encap_object_p
237 #define MY_exec_hdr_flags N_FLAGS_COFF_ENCAPSULATE
239 #include "aout-target.h"