netbsd.h revision 77298 
1/* BFD back-end definitions used by all NetBSD targets.
2   Copyright (C) 1990, 91, 92, 94, 95, 96, 97, 98, 2000
3   Free Software Foundation, Inc.
4
5This file is part of BFD, the Binary File Descriptor library.
6
7This program is free software; you can redistribute it and/or modify
8it under the terms of the GNU General Public License as published by
9the Free Software Foundation; either version 2 of the License, or
10(at your option) any later version.
11
12This program is distributed in the hope that it will be useful,
13but WITHOUT ANY WARRANTY; without even the implied warranty of
14MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
15GNU General Public License for more details.
16
17You should have received a copy of the GNU General Public License
18along with this program; if not, write to the Free Software
19Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307,
20USA.  */
21
22/* Check for our machine type (part of magic number).  */
23#ifndef MACHTYPE_OK
24#define MACHTYPE_OK(m) ((m) == DEFAULT_MID || (m) == M_UNKNOWN)
25#endif
26
27/* This is the normal load address for executables.  */
28#define TEXT_START_ADDR		TARGET_PAGE_SIZE
29
30/* NetBSD ZMAGIC has its header in the text segment.  */
31#define N_HEADER_IN_TEXT(x)	1
32
33/* Determine if this is a shared library using the flags.  */
34#define N_SHARED_LIB(x) 	(N_DYNAMIC(x))
35
36/* We have 6 bits of flags and 10 bits of machine ID.  */
37#define N_MACHTYPE(exec) \
38	((enum machine_type) (((exec).a_info >> 16) & 0x03ff))
39#define N_FLAGS(exec) \
40	(((exec).a_info >> 26) & 0x3f)
41
42#define N_SET_INFO(exec, magic, type, flags) \
43	((exec).a_info = ((magic) & 0xffff) \
44	 | (((int) (type) & 0x3ff) << 16) \
45	 | (((flags) & 0x3f) << 24))
46#define N_SET_MACHTYPE(exec, machtype) \
47	((exec).a_info = \
48         ((exec).a_info & 0xfb00ffff) | ((((int) (machtype))&0x3ff) << 16))
49#define N_SET_FLAGS(exec, flags) \
50	((exec).a_info = \
51	 ((exec).a_info & 0x03ffffff) | ((flags & 0x03f) << 26))
52
53#include "bfd.h"
54#include "sysdep.h"
55#include "libbfd.h"
56#include "libaout.h"
57
58/* On NetBSD, the magic number is always in ntohl's "network" (big-endian)
59   format.  */
60#define SWAP_MAGIC(ext) bfd_getb32 (ext)
61
62/* On NetBSD, the entry point may be taken to be the start of the text
63   section.  */
64#define MY_entry_is_text_address 1
65
66#define MY_write_object_contents MY(write_object_contents)
67static boolean MY(write_object_contents) PARAMS ((bfd *abfd));
68#define MY_text_includes_header 1
69
70#include "aout-target.h"
71
72/* Write an object file.
73   Section contents have already been written.  We write the
74   file header, symbols, and relocation.  */
75
76static boolean
77MY(write_object_contents) (abfd)
78     bfd *abfd;
79{
80  struct external_exec exec_bytes;
81  struct internal_exec *execp = exec_hdr (abfd);
82
83  /* We must make certain that the magic number has been set.  This
84     will normally have been done by set_section_contents, but only if
85     there actually are some section contents.  */
86  if (! abfd->output_has_begun)
87    {
88      bfd_size_type text_size;
89      file_ptr text_end;
90
91      NAME(aout,adjust_sizes_and_vmas) (abfd, &text_size, &text_end);
92    }
93
94  obj_reloc_entry_size (abfd) = RELOC_STD_SIZE;
95
96  /* Magic number, maestro, please!  */
97  switch (bfd_get_arch(abfd)) {
98  case DEFAULT_ARCH:
99    N_SET_MACHTYPE(*execp, DEFAULT_MID);
100    break;
101  default:
102    N_SET_MACHTYPE(*execp, M_UNKNOWN);
103    break;
104  }
105
106  /* The NetBSD magic number is always big-endian */
107#ifndef TARGET_IS_BIG_ENDIAN_P
108  /* XXX aren't there any macro to change byteorder of a word independent of
109     the host's or target's endianesses?  */
110  execp->a_info
111    = (execp->a_info & 0xff) << 24 | (execp->a_info & 0xff00) << 8
112      | (execp->a_info & 0xff0000) >> 8 | (execp->a_info & 0xff000000) >> 24;
113#endif
114
115  WRITE_HEADERS(abfd, execp);
116
117  return true;
118}
119