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