cregit-Linux how code gets into the kernel

Release 4.12 include/uapi/linux/flat.h

 * Copyright (C) 2002-2003  David McCullough <>
 * Copyright (C) 1998       Kenneth Albanowski <>
 *                          The Silver Hammer Group, Ltd.
 * This file provides the definitions and structures needed to
 * support uClinux flat-format executables.



#define	FLAT_VERSION			0x00000004L


#define	MAX_SHARED_LIBS			(4)

#define	MAX_SHARED_LIBS			(1)

 * To make everything easier to port and manage cross platform
 * development,  all fields are in network byte order.

struct flat_hdr {
char magic[4];
unsigned long rev;          /* version (as above) */
unsigned long entry;        /* Offset of first executable instruction
                                       with text segment from beginning of file */
unsigned long data_start;   /* Offset of data segment from beginning of
                                       file */
unsigned long data_end;     /* Offset of end of data segment
                                       from beginning of file */
unsigned long bss_end;      /* Offset of end of bss segment from beginning
                                       of file */

	/* (It is assumed that data_end through bss_end forms the bss segment.) */

unsigned long stack_size;   /* Size of stack, in bytes */
unsigned long reloc_start;  /* Offset of relocation records from
                                       beginning of file */
unsigned long reloc_count;  /* Number of relocation records */
unsigned long flags;       
unsigned long build_date;   /* When the program/library was built */
unsigned long filler[5];    /* Reservered, set to zero */

#define FLAT_FLAG_RAM    0x0001 
/* load program entirely into RAM */

#define FLAT_FLAG_GOTPIC 0x0002 
/* program is PIC with GOT */

#define FLAT_FLAG_GZIP   0x0004 
/* all but the header is compressed */

#define FLAT_FLAG_GZDATA 0x0008 
/* only data/relocs are compressed (for XIP) */

#define FLAT_FLAG_KTRACE 0x0010 
/* output useful kernel trace for debugging */

#endif /* _UAPI_LINUX_FLAT_H */

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