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 encapsu-
lates 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 sub-
sequent 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 relocat-
able 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-datastart
This symbol reflects the starting address of the .isv-
data section.
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User Commands elfwrap(1)
An ELF symbol named isv-dataend
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 "passwdgroup"
[2] 0x00000000 0x00000000 SECT LOCL D 0 .passwd
[3] 0x00000000 0x00000000 SECT LOCL D 0 .group
[7] 0x00000000 0x000002f0 OBJT GLOB D 0 .passwd passwdstart
[8] 0x000002f0 0x00000000 OBJT GLOB D 0 .passwd passwdend
[9] 0x00000000 0x00000121 OBJT GLOB D 0 .group groupstart
[10] 0x00000121 0x00000000 OBJT GLOB D 0 .group groupend
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:
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User Commands elfwrap(1)
This relocatable object can be referenced from the following
user code.
example% cat main.c
#include
extern char passwdstart, passwdend;
void main()
{
char *pstart = &passwdstart, *pend = &passwdend;
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.
ATRIBUTES
See attributes(5) for descriptions of the following attri-
butes:
ATRIBUTE TYPE ATRIBUTE VALUE
Availability SUNWtoo
Interface Stability Committed
SEE ALSO
elfdump(1), ld(1), strings(1), elf(3ELF), attributes(5),
ddimodopen(9F)
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User Commands elfwrap(1)
Linker and Libraries Guide
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