elfwrap(1)							   User Commands							elfwrap(1)

NAME

       elfwrap - wrap data in an ELF file

SYNOPSIS

       elfwrap [-64] [-o relobj-file] [-z target=sparc | x86]
       data-file...

DESCRIPTION

       The  elfwrap utility creates an ELF relocatable object file from one or more data files. The relocatable object encapsulates each data file
       within an individual section, together with symbols that can be used to reference the section. The relocatable object  is  appropriate  for
       inclusion with a subsequent link-edit. Users can reference the encapsulated data using the associated symbols.

       By default, a 32-bit ELF relocatable object is created that is appropriate for the machine on which elfwrap is executed. The -64 option can
       be used to create a 64-bit ELF relocatable object. The -z target option can be used to create a relocatable object for a  specific  machine
       type.

       Note -

	 Any data encapsulated with elfwrap must be in a format appropriate for the destination target.

       By default, the relocatable object a.wrap.o is created. The -o option can be used to specify an alternative relocatable object name.

       The  basename(1)  of  each data file is used to create various pieces of  ELF information.  For example, if the input data file is ISV/isv-
       data, the following ELF information is created within the relocatable object.

       An ELF section named .isv-data

	   This section contains the entire contents of the input data file.

       An ELF symbol named isv-data_start

	   This symbol reflects the starting address of the .isv-data section.

       An ELF symbol named isv-data_end

	   This symbol reflects the address of the first location after the .isv-data section.

OPTIONS

       The following options are supported:

       -64

	   Create a 64-bit ELF relocatable object.

       -o relobj-file

	   Produce a relocatable object that is named relobj-file.

       -z target=sparc | x86

	   Specifies the machine type for the output relocatable object. Supported targets are sparc and x86. The  32-bit  machine  type  for  the
	   specified  target  is  used	unless	the  -64  option  is also present, in which case the corresponding 64-bit machine type is used. By
	   default, the relocatable object that is generated is 32-bit for the machine one which elfwrap is executed.

EXAMPLES

       The following example encapsulates the system passwd file and the system group file within a relocatable object passgroup.o.

	 example% elfwrap -o passgroup.o /etc/passwd /etc/group
	 example% elfdump -s passgroup.o | egrep "passwd|group"
	   [2]	0x00000000 0x00000000  SECT LOCL  D  0 .passwd
	   [3]	0x00000000 0x00000000  SECT LOCL  D  0 .group
	   [7]	0x00000000 0x000002f0  OBJT GLOB  D  0 .passwd	passwd_start
	   [8]	0x000002f0 0x00000000  OBJT GLOB  D  0 .passwd	passwd_end
	   [9]	0x00000000 0x00000121  OBJT GLOB  D  0 .group	group_start
	  [10]	0x00000121 0x00000000  OBJT GLOB  D  0 .group	group_end
	 example% strings -N.passwd passgroup.o | head -1
	 root:x:0:0:Super-User:/:/sbin/sh
	 example% strings -N.group passgroup.o | head -1
	 root::0:

       This relocatable object can be referenced from the following user code.

	 example% cat main.c
	 #include	 <stdio.h>

	 extern char	 passwd_start, passwd_end;

	 void main()
	 {
	     char    *pstart = &passwd_start, *pend = &passwd_end;
	     char    *str, *lstr;

	     for (lstr = str = pstart; str < pend; str++) {
		 if ((*str == '0) && (str != (pend - 1)))  {
		     (void) printf("%.*s", (++str - lstr), lstr);
		  lstr = str;
		 }
	     }
	 }
	 example% cc -o main main.c passgroup.o
	 example% ./main
	 root:x:0:0:Super-User:/:/sbin/sh
	 ....
	 nobody4:x:65534:65534:SunOS 4.x NFS Anonymous Access User:/:

FILES

       a.wrap.o    The default relocatable object file created.

ATTRIBUTES

       See attributes(5) for descriptions of the following attributes:

       +-----------------------------+-----------------------------+
       |      ATTRIBUTE TYPE	     |	    ATTRIBUTE VALUE	   |
       +-----------------------------+-----------------------------+
       |Availability		     |SUNWtoo			   |
       +-----------------------------+-----------------------------+
       |Interface Stability	     |Committed 		   |
       +-----------------------------+-----------------------------+

SEE ALSO

       elfdump(1), ld(1), strings(1), elf(3ELF), attributes(5), ddi_modopen(9F)

       Linker and Libraries Guide

SunOS 5.11							   17 March 2008							elfwrap(1)