OpenCores
URL https://opencores.org/ocsvn/openrisc/openrisc/trunk

Subversion Repositories openrisc

[/] [openrisc/] [trunk/] [gnu-old/] [binutils-2.18.50/] [include/] [aout/] [encap.h] - Blame information for rev 824

Go to most recent revision | Details | Compare with Previous | View Log

Line No. Rev Author Line
1 38 julius
/* Yet Another Try at encapsulating bsd object files in coff.
2
   Copyright 1988, 1989, 1991 Free Software Foundation, Inc.
3
   Written by Pace Willisson 12/9/88
4
 
5
   This file is obsolete.  It needs to be converted to just define a bunch
6
   of stuff that BFD can use to do coff-encapsulated files.  --gnu@cygnus.com
7
 
8
This program is free software; you can redistribute it and/or modify
9
it under the terms of the GNU General Public License as published by
10
the Free Software Foundation; either version 2 of the License, or
11
(at your option) any later version.
12
 
13
This program is distributed in the hope that it will be useful,
14
but WITHOUT ANY WARRANTY; without even the implied warranty of
15
MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
16
GNU General Public License for more details.
17
 
18
You should have received a copy of the GNU General Public License
19
along with this program; if not, write to the Free Software
20
Foundation, Inc., 51 Franklin Street - Fifth Floor, Boston, MA 02110-1301, USA.  */
21
 
22
/*
23
 * We only use the coff headers to tell the kernel
24
 * how to exec the file.  Therefore, the only fields that need to
25
 * be filled in are the scnptr and vaddr for the text and data
26
 * sections, and the vaddr for the bss.  As far as coff is concerned,
27
 * there is no symbol table, relocation, or line numbers.
28
 *
29
 * A normal bsd header (struct exec) is placed after the coff headers,
30
 * and before the real text.  I defined a the new fields 'a_machtype'
31
 * and a_flags.  If a_machtype is M_386, and a_flags & A_ENCAP is
32
 * true, then the bsd header is preceeded by a coff header.  Macros
33
 * like N_TXTOFF and N_TXTADDR use this field to find the bsd header.
34
 *
35
 * The only problem is to track down the bsd exec header.  The
36
 * macros HEADER_OFFSET, etc do this.
37
 */
38
 
39
#define N_FLAGS_COFF_ENCAPSULATE 0x20 /* coff header precedes bsd header */
40
 
41
/* Describe the COFF header used for encapsulation.  */
42
 
43
struct coffheader
44
{
45
  /* filehdr */
46
  unsigned short f_magic;
47
  unsigned short f_nscns;
48
  long f_timdat;
49
  long f_symptr;
50
  long f_nsyms;
51
  unsigned short f_opthdr;
52
  unsigned short f_flags;
53
  /* aouthdr */
54
  short magic;
55
  short vstamp;
56
  long tsize;
57
  long dsize;
58
  long bsize;
59
  long entry;
60
  long text_start;
61
  long data_start;
62
  struct coffscn
63
    {
64
      char s_name[8];
65
      long s_paddr;
66
      long s_vaddr;
67
      long s_size;
68
      long s_scnptr;
69
      long s_relptr;
70
      long s_lnnoptr;
71
      unsigned short s_nreloc;
72
      unsigned short s_nlnno;
73
      long s_flags;
74
    } scns[3];
75
};
76
 
77
/* Describe some of the parameters of the encapsulation,
78
   including how to find the encapsulated BSD header.  */
79
 
80
/* FIXME, this is dumb.  The same tools can't handle a.outs for different
81
   architectures, just because COFF_MAGIC is different; so you need a
82
   separate GNU nm for every architecture!!?  Unfortunately, it needs to
83
   be this way, since the COFF_MAGIC value is determined by the kernel
84
   we're trying to fool here.  */
85
 
86
#define COFF_MAGIC_I386 0514 /* I386MAGIC */
87
#define COFF_MAGIC_M68K 0520 /* MC68MAGIC */
88
 
89
#ifdef COFF_MAGIC
90
short __header_offset_temp;
91
#define HEADER_OFFSET(f) \
92
        (__header_offset_temp = 0, \
93
         fread ((char *)&__header_offset_temp, sizeof (short), 1, (f)), \
94
         fseek ((f), -sizeof (short), 1), \
95
         __header_offset_temp==COFF_MAGIC ? sizeof(struct coffheader) : 0)
96
#else
97
#define HEADER_OFFSET(f) 0
98
#endif
99
 
100
#define HEADER_SEEK(f) (fseek ((f), HEADER_OFFSET((f)), 1))
101
 
102
/* Describe the characteristics of the BSD header
103
   that appears inside the encapsulation.  */
104
 
105
/* Encapsulated coff files that are linked ZMAGIC have a text segment
106
   offset just past the header (and a matching TXTADDR), excluding
107
   the headers from the text segment proper but keeping the physical
108
   layout and the virtual memory layout page-aligned.
109
 
110
   Non-encapsulated a.out files that are linked ZMAGIC have a text
111
   segment that starts at 0 and an N_TXTADR similarly offset to 0.
112
   They too are page-aligned with each other, but they include the
113
   a.out header as part of the text.
114
 
115
   The _N_HDROFF gets sizeof struct exec added to it, so we have
116
   to compensate here.  See <a.out.gnu.h>.  */
117
 
118
#undef _N_HDROFF
119
#undef N_TXTADDR
120
#undef N_DATADDR
121
 
122
#define _N_HDROFF(x) ((N_FLAGS(x) & N_FLAGS_COFF_ENCAPSULATE) ? \
123
                      sizeof (struct coffheader) : 0)
124
 
125
/* Address of text segment in memory after it is loaded.  */
126
#define N_TXTADDR(x) \
127
        ((N_FLAGS(x) & N_FLAGS_COFF_ENCAPSULATE) ? \
128
         sizeof (struct coffheader) + sizeof (struct exec) : 0)
129
#define SEGMENT_SIZE 0x400000
130
 
131
#define N_DATADDR(x) \
132
        ((N_FLAGS(x) & N_FLAGS_COFF_ENCAPSULATE) ? \
133
         (SEGMENT_SIZE + ((N_TXTADDR(x)+(x).a_text-1) & ~(SEGMENT_SIZE-1))) : \
134
         (N_TXTADDR(x)+(x).a_text))

powered by: WebSVN 2.1.0

© copyright 1999-2024 OpenCores.org, equivalent to Oliscience, all rights reserved. OpenCores®, registered trademark.