Annotation of src/external/gpl3/binutils.old/dist/include/aout/encap.h, Revision 1.1.1.3
1.1 christos 1: /* Yet Another Try at encapsulating bfd object files in coff.
1.1.1.3 ! christos 2: Copyright (C) 1988-2016 Free Software Foundation, Inc.
1.1 christos 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5: This file is obsolete.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 3 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,
21: MA 02110-1301, USA. */
22:
23: /*
24: * We only use the coff headers to tell the kernel
25: * how to exec the file. Therefore, the only fields that need to
26: * be filled in are the scnptr and vaddr for the text and data
27: * sections, and the vaddr for the bss. As far as coff is concerned,
28: * there is no symbol table, relocation, or line numbers.
29: *
30: * A normal bsd header (struct exec) is placed after the coff headers,
31: * and before the real text. I defined a the new fields 'a_machtype'
32: * and a_flags. If a_machtype is M_386, and a_flags & A_ENCAP is
33: * true, then the bsd header is preceeded by a coff header. Macros
34: * like N_TXTOFF and N_TXTADDR use this field to find the bsd header.
35: *
36: * The only problem is to track down the bsd exec header. The
37: * macros HEADER_OFFSET, etc do this.
38: */
39:
40: #define N_FLAGS_COFF_ENCAPSULATE 0x20 /* coff header precedes bsd header */
41:
42: /* Describe the COFF header used for encapsulation. */
43:
44: struct coffheader
45: {
46: /* filehdr */
47: unsigned short f_magic;
48: unsigned short f_nscns;
49: long f_timdat;
50: long f_symptr;
51: long f_nsyms;
52: unsigned short f_opthdr;
53: unsigned short f_flags;
54: /* aouthdr */
55: short magic;
56: short vstamp;
57: long tsize;
58: long dsize;
59: long bsize;
60: long entry;
61: long text_start;
62: long data_start;
63: struct coffscn
64: {
65: char s_name[8];
66: long s_paddr;
67: long s_vaddr;
68: long s_size;
69: long s_scnptr;
70: long s_relptr;
71: long s_lnnoptr;
72: unsigned short s_nreloc;
73: unsigned short s_nlnno;
74: long s_flags;
75: } scns[3];
76: };
77:
78: /* Describe some of the parameters of the encapsulation,
79: including how to find the encapsulated BSD header. */
80:
81: /* FIXME, this is dumb. The same tools can't handle a.outs for different
82: architectures, just because COFF_MAGIC is different; so you need a
83: separate GNU nm for every architecture!!? Unfortunately, it needs to
84: be this way, since the COFF_MAGIC value is determined by the kernel
85: we're trying to fool here. */
86:
87: #define COFF_MAGIC_I386 0514 /* I386MAGIC */
88: #define COFF_MAGIC_M68K 0520 /* MC68MAGIC */
89:
90: #ifdef COFF_MAGIC
91: short __header_offset_temp;
92: #define HEADER_OFFSET(f) \
93: (__header_offset_temp = 0, \
94: fread ((char *)&__header_offset_temp, sizeof (short), 1, (f)), \
95: fseek ((f), -sizeof (short), 1), \
96: __header_offset_temp==COFF_MAGIC ? sizeof(struct coffheader) : 0)
97: #else
98: #define HEADER_OFFSET(f) 0
99: #endif
100:
101: #define HEADER_SEEK(f) (fseek ((f), HEADER_OFFSET((f)), 1))
102:
103: /* Describe the characteristics of the BSD header
104: that appears inside the encapsulation. */
105:
106: /* Encapsulated coff files that are linked ZMAGIC have a text segment
107: offset just past the header (and a matching TXTADDR), excluding
108: the headers from the text segment proper but keeping the physical
109: layout and the virtual memory layout page-aligned.
110:
111: Non-encapsulated a.out files that are linked ZMAGIC have a text
112: segment that starts at 0 and an N_TXTADR similarly offset to 0.
113: They too are page-aligned with each other, but they include the
114: a.out header as part of the text.
115:
116: The _N_HDROFF gets sizeof struct exec added to it, so we have
117: to compensate here. See <a.out.gnu.h>. */
118:
119: #undef _N_HDROFF
120: #undef N_TXTADDR
121: #undef N_DATADDR
122:
123: #define _N_HDROFF(x) ((N_FLAGS(x) & N_FLAGS_COFF_ENCAPSULATE) ? \
124: sizeof (struct coffheader) : 0)
125:
126: /* Address of text segment in memory after it is loaded. */
127: #define N_TXTADDR(x) \
128: ((N_FLAGS(x) & N_FLAGS_COFF_ENCAPSULATE) ? \
129: sizeof (struct coffheader) + sizeof (struct exec) : 0)
130: #define SEGMENT_SIZE 0x400000
131:
132: #define N_DATADDR(x) \
133: ((N_FLAGS(x) & N_FLAGS_COFF_ENCAPSULATE) ? \
1.1.1.3 ! christos 134: (SEGMENT_SIZE + ((N_TXTADDR(x)+(x)->a_text-1) & ~(SEGMENT_SIZE-1))) : \
! 135: (N_TXTADDR(x)+(x)->a_text))
CVSweb <webmaster@jp.NetBSD.org>
![[BACK]](/icons/back.gif){kind=icon}
Return to encap.h CVS log ![[TXT]](/icons/text.gif){kind=icon}
![[DIR]](/icons/dir.gif){kind=icon}
Up to [cvs.NetBSD.org] / src / external / gpl3 / binutils.old / dist / include / aout