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 */