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