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