1/* BFD back-end definitions used by all FreeBSD targets.
2   Copyright 1990, 1991, 1992, 1996, 1997, 2000, 2001, 2002, 2005, 2007
3   Free Software Foundation, Inc.
4
5   This file is part of BFD, the Binary File Descriptor library.
6
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.
11
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.
16
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., 51 Franklin Street - Fifth Floor, Boston, MA 02110-1301,
20   USA.  */
21
22/* $FreeBSD$ */
23
24/* FreeBSD QMAGIC files have the header in the text. */
25#define	N_HEADER_IN_TEXT(x)	1
26#define MY_text_includes_header 1
27
28#define TEXT_START_ADDR		(TARGET_PAGE_SIZE + 0x20)
29
30/*
31 * FreeBSD uses a weird mix of byte orderings for its a_info field.
32 * Its assembler emits NetBSD style object files, with a big-endian
33 * a_info.  Its linker seems to accept either byte ordering, but
34 * emits a little-endian a_info.
35 *
36 * Here, we accept either byte ordering, but always produce
37 * little-endian.
38 *
39 * FIXME - Probably we should always produce the _native_ byte
40 * ordering.  I.e., it should be in the architecture-specific
41 * file, not here.  But in reality, there is no chance
42 * that FreeBSD will ever use a.out in a new port.
43 */
44
45#define N_MACHTYPE(exec) \
46	((enum machine_type) \
47	 ((freebsd_swap_magic(&(exec).a_info) >> 16) & 0x3ff))
48#define N_FLAGS(exec) \
49	((enum machine_type) \
50	 ((freebsd_swap_magic(&(exec).a_info) >> 26) & 0x3f))
51
52#define N_SET_INFO(exec, magic, type, flags) \
53	((exec).a_info = ((magic) & 0xffff) \
54	 | (((int)(type) & 0x3ff) << 16) \
55	 | (((flags) & 0x3f) << 26))
56#define N_SET_MACHTYPE(exec, machtype) \
57	((exec).a_info = \
58         ((exec).a_info & 0xfb00ffff) | ((((int) (machtype)) & 0x3ff) << 16))
59#define N_SET_FLAGS(exec, flags) \
60	((exec).a_info = \
61	 ((exec).a_info & 0x03ffffff) | ((flags & 0x03f) << 26))
62
63#include "sysdep.h"
64#include "bfd.h"
65#include "libbfd.h"
66#include "libaout.h"
67
68#define SWAP_MAGIC(ext)			(freebsd_swap_magic(ext))
69
70#define MY_bfd_final_link MY (bfd_final_link)
71#define MY_write_object_contents MY (write_object_contents)
72static bfd_boolean MY (bfd_final_link) (bfd *, struct bfd_link_info *);
73static bfd_boolean MY (write_object_contents) (bfd *);
74static long freebsd_swap_magic (void *);
75
76#include "aout-target.h"
77
78static bfd_boolean
79MY (bfd_final_link) (bfd *abfd, struct bfd_link_info *info)
80{
81  obj_aout_subformat (abfd) = q_magic_format;
82  return NAME(aout,final_link) (abfd, info, MY_final_link_callback);
83}
84
85/* Swap a magic number.  We accept either endian, whichever looks valid. */
86
87static long
88freebsd_swap_magic (void *ext)
89{
90  long linfo = bfd_getl32(ext);
91  long binfo = bfd_getb32(ext);
92  int lmagic = linfo & 0xffff;
93  int bmagic = binfo & 0xffff;
94  int lmagic_ok = lmagic == OMAGIC || lmagic == NMAGIC ||
95    lmagic == ZMAGIC || lmagic == QMAGIC;
96  int bmagic_ok = bmagic == OMAGIC || bmagic == NMAGIC ||
97    bmagic == ZMAGIC || bmagic == QMAGIC;
98
99  return bmagic_ok && !lmagic_ok ? binfo : linfo;
100}
101
102/* Write an object file.
103   Section contents have already been written.  We write the
104   file header, symbols, and relocation.  */
105
106static bfd_boolean
107MY (write_object_contents) (bfd *abfd)
108{
109  struct external_exec exec_bytes;
110  struct internal_exec *execp = exec_hdr (abfd);
111
112  obj_reloc_entry_size (abfd) = RELOC_STD_SIZE;
113
114  /* Magic number, maestro, please!  */
115  switch (bfd_get_arch(abfd))
116    {
117    case bfd_arch_m68k:
118      if (strcmp (abfd->xvec->name, "a.out-m68k4k-netbsd") == 0)
119	N_SET_MACHTYPE (*execp, M_68K4K_NETBSD);
120      else
121	N_SET_MACHTYPE (*execp, M_68K_NETBSD);
122      break;
123    case bfd_arch_sparc:
124      N_SET_MACHTYPE (*execp, M_SPARC_NETBSD);
125      break;
126    case bfd_arch_i386:
127      N_SET_MACHTYPE (*execp, M_386_NETBSD);
128      break;
129    case bfd_arch_ns32k:
130      N_SET_MACHTYPE (*execp, M_532_NETBSD);
131      break;
132    default:
133      N_SET_MACHTYPE (*execp, M_UNKNOWN);
134      break;
135    }
136
137  WRITE_HEADERS(abfd, execp);
138
139  return TRUE;
140}
141