include/linux/flat.h

   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 */