linux-user/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_USER_FLAT_H
  11 #define LINUX_USER_FLAT_H
  12
  13 #define FLAT_VERSION                    0x00000004L
  14
  15 #ifdef CONFIG_BINFMT_SHARED_FLAT
  16 #define MAX_SHARED_LIBS                 (4)
  17 #else
  18 #define MAX_SHARED_LIBS                 (1)
  19 #endif
  20
  21 /*
  22  * To make everything easier to port and manage cross platform
  23  * development,  all fields are in network byte order.
  24  */
  25
  26 struct flat_hdr {
  27         char magic[4];
  28         abi_ulong rev;          /* version (as above) */
  29         abi_ulong entry;        /* Offset of first executable instruction
  30                                    with text segment from beginning of file */
  31         abi_ulong data_start;   /* Offset of data segment from beginning of
  32                                    file */
  33         abi_ulong data_end;     /* Offset of end of data segment
  34                                    from beginning of file */
  35         abi_ulong bss_end;      /* Offset of end of bss segment from beginning
  36                                    of file */
  37
  38         /* (It is assumed that data_end through bss_end forms the bss segment.) */
  39
  40         abi_ulong stack_size;   /* Size of stack, in bytes */
  41         abi_ulong reloc_start;  /* Offset of relocation records from
  42                                    beginning of file */
  43         abi_ulong reloc_count;  /* Number of relocation records */
  44         abi_ulong flags;
  45         abi_ulong build_date;   /* When the program/library was built */
  46         abi_ulong filler[5];    /* Reserved, set to zero */
  47 };
  48
  49 #define FLAT_FLAG_RAM    0x0001 /* load program entirely into RAM */
  50 #define FLAT_FLAG_GOTPIC 0x0002 /* program is PIC with GOT */
  51 #define FLAT_FLAG_GZIP   0x0004 /* all but the header is compressed */
  52 #define FLAT_FLAG_GZDATA 0x0008 /* only data/relocs are compressed (for XIP) */
  53 #define FLAT_FLAG_KTRACE 0x0010 /* output useful kernel trace for debugging */
  54
  55
  56 /*
  57  * While it would be nice to keep this header clean,  users of older
  58  * tools still need this support in the kernel.  So this section is
  59  * purely for compatibility with old tool chains.
  60  *
  61  * DO NOT make changes or enhancements to the old format please,  just work
  62  *        with the format above,  except to fix bugs with old format support.
  63  */
  64
  65 #define OLD_FLAT_VERSION                        0x00000002L
  66 #define OLD_FLAT_RELOC_TYPE_TEXT        0
  67 #define OLD_FLAT_RELOC_TYPE_DATA        1
  68 #define OLD_FLAT_RELOC_TYPE_BSS         2
  69
  70 #       define OLD_FLAT_FLAG_RAM    0x1 /* load program entirely into RAM */
  71
  72 #endif