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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
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 #define BYTES_IN_WORD 4
28 #endif
30 #include "bfd.h"
31 #include "sysdep.h"
32 #include "libbfd.h"
33 #include "aout/aout64.h"
34 #include "aout/stab_gnu.h"
35 #include "aout/ar.h"
36 #include "libaout.h" /* BFD a.out internal data structures */
38 const bfd_target *encap_real_callback ();
40 const bfd_target *
41 encap_object_p (abfd)
42 bfd *abfd;
44 unsigned char magicbuf[4]; /* Raw bytes of magic number from file */
45 unsigned long magic; /* Swapped magic number */
46 short coff_magic;
47 struct external_exec exec_bytes;
48 struct internal_exec exec;
49 bfd_size_type amt = sizeof (magicbuf);
51 if (bfd_bread ((PTR) magicbuf, amt, abfd) != amt)
53 if (bfd_get_error () != bfd_error_system_call)
54 bfd_set_error (bfd_error_wrong_format);
55 return 0;
58 coff_magic = H_GET_16 (abfd, magicbuf);
59 if (coff_magic != COFF_MAGIC)
60 return 0; /* Not an encap coff file */
62 magic = H_GET_32 (abfd, magicbuf);
64 if (N_BADMAG (*((struct internal_exec *) &magic)))
65 return 0;
67 if (bfd_seek (abfd, (file_ptr) sizeof (struct coffheader), SEEK_SET) != 0)
68 return 0;
70 amt = EXEC_BYTES_SIZE;
71 if (bfd_bread ((PTR) &exec_bytes, amt, abfd) != amt)
73 if (bfd_get_error () != bfd_error_system_call)
74 bfd_set_error (bfd_error_wrong_format);
75 return 0;
77 NAME(aout,swap_exec_header_in) (abfd, &exec_bytes, &exec);
79 return aout_32_some_aout_object_p (abfd, &exec, encap_realcallback);
82 /* Finish up the reading of an encapsulated-coff a.out file header. */
83 const bfd_target *
84 encap_real_callback (abfd)
85 bfd *abfd;
87 struct internal_exec *execp = exec_hdr (abfd);
89 MY(callback) (abfd, execp);
91 /* If we have a coff header, it can give us better values for
92 text_start and exec_data_start. This is particularly useful
93 for remote debugging of embedded systems. */
94 if (N_FLAGS(exec_aouthdr) & N_FLAGS_COFF_ENCAPSULATE)
96 struct coffheader ch;
97 int val;
98 val = lseek (execchan, -(sizeof (AOUTHDR) + sizeof (ch)), 1);
99 if (val == -1)
100 perror_with_name (filename);
101 val = myread (execchan, &ch, sizeof (ch));
102 if (val < 0)
103 perror_with_name (filename);
104 text_start = ch.text_start;
105 exec_data_start = ch.data_start;
107 else
109 text_start =
110 IS_OBJECT_FILE (exec_aouthdr) ? 0 : N_TXTADDR (exec_aouthdr);
111 exec_data_start = (IS_OBJECT_FILE (exec_aouthdr)
112 ? exec_aouthdr.a_text
113 : N_DATADDR (exec_aouthdr));
116 /* Determine the architecture and machine type of the object file. */
117 bfd_default_set_arch_mach(abfd, bfd_arch_m68k, 0); /* FIXME */
119 return abfd->xvec;
122 /* Write an object file in Encapsulated COFF format.
123 Section contents have already been written. We write the
124 file header, symbols, and relocation. */
126 boolean
127 encap_write_object_contents (abfd)
128 bfd *abfd;
130 bfd_size_type data_pad = 0;
131 struct external_exec exec_bytes;
132 struct internal_exec *execp = exec_hdr (abfd);
134 /* FIXME: Fragments from the old GNU LD program for dealing with
135 encap coff. */
136 struct coffheader coffheader;
137 int need_coff_header;
139 /* Determine whether to count the header as part of
140 the text size, and initialize the text size accordingly.
141 This depends on the kind of system and on the output format selected. */
143 N_SET_MAGIC (outheader, magic);
144 #ifdef INITIALIZE_HEADER
145 INITIALIZE_HEADER;
146 #endif
148 text_size = sizeof (struct exec);
149 #ifdef COFF_ENCAPSULATE
150 if (relocatable_output == 0 && file_table[0].just_syms_flag == 0)
152 need_coff_header = 1;
153 /* set this flag now, since it will change the values of N_TXTOFF, etc */
154 N_SET_FLAGS (outheader, aout_backend_info (abfd)->exec_hdr_flags);
155 text_size += sizeof (struct coffheader);
157 #endif
159 #ifdef COFF_ENCAPSULATE
160 if (need_coff_header)
162 /* We are encapsulating BSD format within COFF format. */
163 struct coffscn *tp, *dp, *bp;
165 tp = &coffheader.scns[0];
166 dp = &coffheader.scns[1];
167 bp = &coffheader.scns[2];
169 strcpy (tp->s_name, ".text");
170 tp->s_paddr = text_start;
171 tp->s_vaddr = text_start;
172 tp->s_size = text_size;
173 tp->s_scnptr = sizeof (struct coffheader) + sizeof (struct exec);
174 tp->s_relptr = 0;
175 tp->s_lnnoptr = 0;
176 tp->s_nreloc = 0;
177 tp->s_nlnno = 0;
178 tp->s_flags = 0x20;
179 strcpy (dp->s_name, ".data");
180 dp->s_paddr = data_start;
181 dp->s_vaddr = data_start;
182 dp->s_size = data_size;
183 dp->s_scnptr = tp->s_scnptr + tp->s_size;
184 dp->s_relptr = 0;
185 dp->s_lnnoptr = 0;
186 dp->s_nreloc = 0;
187 dp->s_nlnno = 0;
188 dp->s_flags = 0x40;
189 strcpy (bp->s_name, ".bss");
190 bp->s_paddr = dp->s_vaddr + dp->s_size;
191 bp->s_vaddr = bp->s_paddr;
192 bp->s_size = bss_size;
193 bp->s_scnptr = 0;
194 bp->s_relptr = 0;
195 bp->s_lnnoptr = 0;
196 bp->s_nreloc = 0;
197 bp->s_nlnno = 0;
198 bp->s_flags = 0x80;
200 coffheader.f_magic = COFF_MAGIC;
201 coffheader.f_nscns = 3;
202 /* store an unlikely time so programs can
203 * tell that there is a bsd header
205 coffheader.f_timdat = 1;
206 coffheader.f_symptr = 0;
207 coffheader.f_nsyms = 0;
208 coffheader.f_opthdr = 28;
209 coffheader.f_flags = 0x103;
210 /* aouthdr */
211 coffheader.magic = ZMAGIC;
212 coffheader.vstamp = 0;
213 coffheader.tsize = tp->s_size;
214 coffheader.dsize = dp->s_size;
215 coffheader.bsize = bp->s_size;
216 coffheader.entry = outheader.a_entry;
217 coffheader.text_start = tp->s_vaddr;
218 coffheader.data_start = dp->s_vaddr;
220 #endif
222 #ifdef COFF_ENCAPSULATE
223 if (need_coff_header)
224 mywrite (&coffheader, sizeof coffheader, 1, outdesc);
225 #endif
227 #ifndef COFF_ENCAPSULATE
228 padfile (N_TXTOFF (outheader) - sizeof outheader, outdesc);
229 #endif
231 text_size -= N_TXTOFF (outheader);
232 WRITE_HEADERS(abfd, execp);
233 return true;
236 #define MY_write_object_content encap_write_object_contents
237 #define MY_object_p encap_object_p
238 #define MY_exec_hdr_flags N_FLAGS_COFF_ENCAPSULATE
240 #include "aout-target.h"