include/uapi/linux/flat.h

   1 /* SPDX-License-Identifier: GPL-2.0 WITH Linux-syscall-note */
   2 /*
   3  * Copyright (C) 2002-2003  David McCullough <davidm@snapgear.com>
   4  * Copyright (C) 1998       Kenneth Albanowski <kjahds@kjahds.com>
   5  *                          The Silver Hammer Group, Ltd.
   6  *
   7  * This file provides the definitions and structures needed to
   8  * support uClinux flat-format executables.
   9  */
  10
  11 #ifndef _UAPI_LINUX_FLAT_H
  12 #define _UAPI_LINUX_FLAT_H
  13
  14
  15 #define FLAT_VERSION                    0x00000004L
  16
  17 #ifdef CONFIG_BINFMT_SHARED_FLAT
  18 #define MAX_SHARED_LIBS                 (4)
  19 #else
  20 #define MAX_SHARED_LIBS                 (1)
  21 #endif
  22
  23 /*
  24  * To make everything easier to port and manage cross platform
  25  * development,  all fields are in network byte order.
  26  */
  27
  28 struct flat_hdr {
  29         char magic[4];
  30         unsigned long rev;          /* version (as above) */
  31         unsigned long entry;        /* Offset of first executable instruction
  32                                        with text segment from beginning of file */
  33         unsigned long data_start;   /* Offset of data segment from beginning of
  34                                        file */
  35         unsigned long data_end;     /* Offset of end of data segment
  36                                        from beginning of file */
  37         unsigned long bss_end;      /* Offset of end of bss segment from beginning
  38                                        of file */
  39
  40         /* (It is assumed that data_end through bss_end forms the bss segment.) */
  41
  42         unsigned long stack_size;   /* Size of stack, in bytes */
  43         unsigned long reloc_start;  /* Offset of relocation records from
  44                                        beginning of file */
  45         unsigned long reloc_count;  /* Number of relocation records */
  46         unsigned long flags;
  47         unsigned long build_date;   /* When the program/library was built */
  48         unsigned long filler[5];    /* Reservered, set to zero */
  49 };
  50
  51 #define FLAT_FLAG_RAM    0x0001 /* load program entirely into RAM */
  52 #define FLAT_FLAG_GOTPIC 0x0002 /* program is PIC with GOT */
  53 #define FLAT_FLAG_GZIP   0x0004 /* all but the header is compressed */
  54 #define FLAT_FLAG_GZDATA 0x0008 /* only data/relocs are compressed (for XIP) */
  55 #define FLAT_FLAG_KTRACE 0x0010 /* output useful kernel trace for debugging */
  56
  57
  58
  59 #endif /* _UAPI_LINUX_FLAT_H */