1 /*
2 * Copyright (C) 2002-2003 David McCullough <davidm@snapgear.com>
3 * Copyright (C) 1998 Kenneth Albanowski <kjahds@kjahds.com>
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 _LINUX_FLAT_H
11 #define _LINUX_FLAT_H
12
13 #ifdef __KERNEL__
14 #include <asm/flat.h>
15 #endif
16
17 #define FLAT_VERSION 0x00000004L
18
19 #ifdef CONFIG_BINFMT_SHARED_FLAT
20 #define MAX_SHARED_LIBS (4)
21 #else
22 #define MAX_SHARED_LIBS (1)
23 #endif
24
25 /*
26 * To make everything easier to port and manage cross platform
27 * development, all fields are in network byte order.
28 */
29
30 struct flat_hdr {
31 char magic[4];
32 unsigned long rev; /* version (as above) */
33 unsigned long entry; /* Offset of first executable instruction
34 with text segment from beginning of file */
35 unsigned long data_start; /* Offset of data segment from beginning of
36 file */
37 unsigned long data_end; /* Offset of end of data segment
38 from beginning of file */
39 unsigned long bss_end; /* Offset of end of bss segment from beginning
40 of file */
41
42 /* (It is assumed that data_end through bss_end forms the bss segment.) */
43
44 unsigned long stack_size; /* Size of stack, in bytes */
45 unsigned long reloc_start; /* Offset of relocation records from
46 beginning of file */
47 unsigned long reloc_count; /* Number of relocation records */
48 unsigned long flags;
49 unsigned long build_date; /* When the program/library was built */
50 unsigned long filler[5]; /* Reservered, set to zero */
51 };
52
53 #define FLAT_FLAG_RAM 0x0001 /* load program entirely into RAM */
54 #define FLAT_FLAG_GOTPIC 0x0002 /* program is PIC with GOT */
55 #define FLAT_FLAG_GZIP 0x0004 /* all but the header is compressed */
56 #define FLAT_FLAG_GZDATA 0x0008 /* only data/relocs are compressed (for XIP) */
57 #define FLAT_FLAG_KTRACE 0x0010 /* output useful kernel trace for debugging */
58
59
60 #ifdef __KERNEL__ /* so systems without linux headers can compile the apps */
61 /*
62 * While it would be nice to keep this header clean, users of older
63 * tools still need this support in the kernel. So this section is
64 * purely for compatibility with old tool chains.
65 *
66 * DO NOT make changes or enhancements to the old format please, just work
67 * with the format above, except to fix bugs with old format support.
68 */
69
70 #include <asm/byteorder.h>
71
72 #define OLD_FLAT_VERSION 0x00000002L
73 #define OLD_FLAT_RELOC_TYPE_TEXT 0
74 #define OLD_FLAT_RELOC_TYPE_DATA 1
75 #define OLD_FLAT_RELOC_TYPE_BSS 2
76
77 typedef union {
78 unsigned long value;
79 struct {
80 # if defined(mc68000) && !defined(CONFIG_COLDFIRE)
81 signed long offset : 30;
82 unsigned long type : 2;
83 # define OLD_FLAT_FLAG_RAM 0x1 /* load program entirely into RAM */
84 # elif defined(__BIG_ENDIAN_BITFIELD)
85 unsigned long type : 2;
86 signed long offset : 30;
87 # define OLD_FLAT_FLAG_RAM 0x1 /* load program entirely into RAM */
88 # elif defined(__LITTLE_ENDIAN_BITFIELD)
89 signed long offset : 30;
90 unsigned long type : 2;
91 # define OLD_FLAT_FLAG_RAM 0x1 /* load program entirely into RAM */
92 # else
93 # error "Unknown bitfield order for flat files."
94 # endif
95 } reloc;
96 } flat_v2_reloc_t;
97
98 #endif /* __KERNEL__ */
99
100 #endif /* _LINUX_FLAT_H */
101
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