toolchain/elf2flt/elf2flt/flat.h

   1 /*
   2  * Copyright (C) 2002-2005  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  * This is Free Software, under the GNU Public Licence v2 or greater.
  10  *
  11  */
  12
  13 #ifndef _LINUX_FLAT_H
  14 #define _LINUX_FLAT_H
  15
  16 #ifdef __KERNEL__
  17 #include <linux/types.h>
  18 #include <asm/flat.h>
  19 #endif
  20
  21 #define FLAT_VERSION                    0x00000004L
  22
  23 #ifdef CONFIG_BINFMT_SHARED_FLAT
  24 #define MAX_SHARED_LIBS                 (4)
  25 #else
  26 #define MAX_SHARED_LIBS                 (1)
  27 #endif
  28
  29 /*
  30  * To make everything easier to port and manage cross platform
  31  * development,  all fields are in network byte order.
  32  */
  33
  34 struct flat_hdr {
  35     char magic[4];
  36     uint32_t rev;          /* version (as above) */
  37     uint32_t entry;        /* Offset of first executable instruction
  38                               with text segment from beginning of file */
  39     uint32_t data_start;   /* Offset of data segment from beginning of
  40                               file */
  41     uint32_t data_end;     /* Offset of end of data segment from beginning
  42                               of file */
  43     uint32_t bss_end;      /* Offset of end of bss segment from beginning
  44                               of file */
  45
  46     /* (It is assumed that data_end through bss_end forms the bss segment.) */
  47
  48     uint32_t stack_size;   /* Size of stack, in bytes */
  49     uint32_t reloc_start;  /* Offset of relocation records from beginning
  50                               of file */
  51     uint32_t reloc_count;  /* Number of relocation records */
  52     uint32_t flags;
  53     uint32_t build_date;   /* When the program/library was built */
  54     uint32_t filler[5];    /* Reservered, set to zero */
  55 };
  56
  57 #define FLAT_FLAG_RAM    0x0001 /* load program entirely into RAM */
  58 #define FLAT_FLAG_GOTPIC 0x0002 /* program is PIC with GOT */
  59 #define FLAT_FLAG_GZIP   0x0004 /* all but the header is compressed */
  60 #define FLAT_FLAG_GZDATA 0x0008 /* only data/relocs are compressed (for XIP) */
  61 #define FLAT_FLAG_KTRACE 0x0010 /* output useful kernel trace for debugging */
  62
  63 #ifdef __KERNEL__ /* so systems without linux headers can compile the apps */
  64 /*
  65  * While it would be nice to keep this header clean,  users of older
  66  * tools still need this support in the kernel.  So this section is
  67  * purely for compatibility with old tool chains.
  68  *
  69  * DO NOT make changes or enhancements to the old format please,  just work
  70  *        with the format above,  except to fix bugs with old format support.
  71  */
  72
  73 #include <asm/byteorder.h>
  74
  75 #define OLD_FLAT_VERSION                0x00000002L
  76 #define OLD_FLAT_RELOC_TYPE_TEXT        0
  77 #define OLD_FLAT_RELOC_TYPE_DATA        1
  78 #define OLD_FLAT_RELOC_TYPE_BSS         2
  79
  80 typedef union {
  81     uint32_t        value;
  82     struct {
  83 # if defined(mc68000) && !defined(CONFIG_COLDFIRE)
  84         int32_t     offset : 30;
  85         uint32_t    type   : 2;
  86 #       define OLD_FLAT_FLAG_RAM    0x1 /* load program entirely into RAM */
  87 # elif defined(__BIG_ENDIAN_BITFIELD)
  88         uint32_t    type   : 2;
  89         int32_t     offset : 30;
  90 #       define OLD_FLAT_FLAG_RAM    0x1 /* load program entirely into RAM */
  91 # elif defined(__LITTLE_ENDIAN_BITFIELD)
  92         int32_t     offset : 30;
  93         uint32_t    type   : 2;
  94 #       define OLD_FLAT_FLAG_RAM    0x1 /* load program entirely into RAM */
  95 # else
  96 #       error "Unknown bitfield order for flat files."
  97 # endif
  98     } reloc;
  99 } flat_v2_reloc_t;
 100
 101 #endif /* __KERNEL__ */
 102
 103 #endif /* _LINUX_FLAT_H */
 104
 105 /* this __MUST__ be at the VERY end of the file - do NOT move!!
 106  * Local Variables:
 107  * c-basic-offset: 4
 108  * tab-width: 8
 109  * end:
 110  * vi: tabstop=8 shiftwidth=4 textwidth=79 noexpandtab
 111  */