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flat.h
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1 /*
2  * Copyright (C) 2002-2003 David McCullough <[email protected]>
3  * Copyright (C) 1998 Kenneth Albanowski <[email protected]>
4  * The Silver Hammer Group, Ltd.
5  *
6  * This file provides the definitions and structures needed to
7  * support uClinux flat-format executables.
8  */
9 
10 #ifndef _UAPI_LINUX_FLAT_H
11 #define _UAPI_LINUX_FLAT_H
12 
13 
14 #define FLAT_VERSION 0x00000004L
15 
16 #ifdef CONFIG_BINFMT_SHARED_FLAT
17 #define MAX_SHARED_LIBS (4)
18 #else
19 #define MAX_SHARED_LIBS (1)
20 #endif
21 
22 /*
23  * To make everything easier to port and manage cross platform
24  * development, all fields are in network byte order.
25  */
26 
27 struct flat_hdr {
28  char magic[4];
29  unsigned long rev; /* version (as above) */
30  unsigned long entry; /* Offset of first executable instruction
31  with text segment from beginning of file */
32  unsigned long data_start; /* Offset of data segment from beginning of
33  file */
34  unsigned long data_end; /* Offset of end of data segment
35  from beginning of file */
36  unsigned long bss_end; /* Offset of end of bss segment from beginning
37  of file */
38 
39  /* (It is assumed that data_end through bss_end forms the bss segment.) */
40 
41  unsigned long stack_size; /* Size of stack, in bytes */
42  unsigned long reloc_start; /* Offset of relocation records from
43  beginning of file */
44  unsigned long reloc_count; /* Number of relocation records */
45  unsigned long flags;
46  unsigned long build_date; /* When the program/library was built */
47  unsigned long filler[5]; /* Reservered, set to zero */
48 };
49 
50 #define FLAT_FLAG_RAM 0x0001 /* load program entirely into RAM */
51 #define FLAT_FLAG_GOTPIC 0x0002 /* program is PIC with GOT */
52 #define FLAT_FLAG_GZIP 0x0004 /* all but the header is compressed */
53 #define FLAT_FLAG_GZDATA 0x0008 /* only data/relocs are compressed (for XIP) */
54 #define FLAT_FLAG_KTRACE 0x0010 /* output useful kernel trace for debugging */
55 
56 
57 
58 #endif /* _UAPI_LINUX_FLAT_H */