linux/include/linux/flat.h
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   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
  30struct 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
  77typedef 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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