Current File : //usr/src/linux-headers-5.15.0-125-generic/include/linux/flat.h
/* SPDX-License-Identifier: GPL-2.0 */
/*
* Copyright (C) 2002-2003 David McCullough <davidm@snapgear.com>
* Copyright (C) 1998 Kenneth Albanowski <kjahds@kjahds.com>
* The Silver Hammer Group, Ltd.
*
* This file provides the definitions and structures needed to
* support uClinux flat-format executables.
*/
#ifndef _LINUX_FLAT_H
#define _LINUX_FLAT_H
#define FLAT_VERSION 0x00000004L
/*
* To make everything easier to port and manage cross platform
* development, all fields are in network byte order.
*/
struct flat_hdr {
char magic[4];
__be32 rev; /* version (as above) */
__be32 entry; /* Offset of first executable instruction
with text segment from beginning of file */
__be32 data_start; /* Offset of data segment from beginning of
file */
__be32 data_end; /* Offset of end of data segment from beginning
of file */
__be32 bss_end; /* Offset of end of bss segment from beginning
of file */
/* (It is assumed that data_end through bss_end forms the bss segment.) */
__be32 stack_size; /* Size of stack, in bytes */
__be32 reloc_start; /* Offset of relocation records from beginning of
file */
__be32 reloc_count; /* Number of relocation records */
__be32 flags;
__be32 build_date; /* When the program/library was built */
__u32 filler[5]; /* Reservered, set to zero */
};
#define FLAT_FLAG_RAM 0x0001 /* load program entirely into RAM */
#define FLAT_FLAG_GOTPIC 0x0002 /* program is PIC with GOT */
#define FLAT_FLAG_GZIP 0x0004 /* all but the header is compressed */
#define FLAT_FLAG_GZDATA 0x0008 /* only data/relocs are compressed (for XIP) */
#define FLAT_FLAG_KTRACE 0x0010 /* output useful kernel trace for debugging */
/*
* While it would be nice to keep this header clean, users of older
* tools still need this support in the kernel. So this section is
* purely for compatibility with old tool chains.
*
* DO NOT make changes or enhancements to the old format please, just work
* with the format above, except to fix bugs with old format support.
*/
#define OLD_FLAT_VERSION 0x00000002L
#define OLD_FLAT_RELOC_TYPE_TEXT 0
#define OLD_FLAT_RELOC_TYPE_DATA 1
#define OLD_FLAT_RELOC_TYPE_BSS 2
typedef union {
u32 value;
struct {
#if defined(__LITTLE_ENDIAN_BITFIELD) || \
(defined(mc68000) && !defined(CONFIG_COLDFIRE))
s32 offset : 30;
u32 type : 2;
# elif defined(__BIG_ENDIAN_BITFIELD)
u32 type : 2;
s32 offset : 30;
# else
# error "Unknown bitfield order for flat files."
# endif
} reloc;
} flat_v2_reloc_t;
#endif /* _LINUX_FLAT_H */
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