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From: smith@compound.se (Bj|rn Smith)
Newsgroups: comp.unix.xenix.sco
Subject: Relocating data space
Keywords: relocate link ld shared memory shmat
Message-ID: <252@comsys.UUCP>
Date: 18 Feb 91 08:33:08 GMT
Reply-To: smith@compound.se (Bj|rn Smith)
Organization: Compound Systems
Lines: 42
UUCP-Path: sunic!comsys!smith


Is there a way of linking a program in such a way that the data area
(or a part of the data area) is relocated to an address outside
the process address space ?

This is the case:

	.
	.
	int shdata[1024];
	.
	.
	main()
	{
	    .
	    /* Before accessing any data: Allocate a shared memory */
	    /* segment which normally returns an address 64000000 hex. */
	    .
	    shdata[0] = 37;	/* This will access the first int in the */
				/* shared memory segment. */
	    .
	    .
Now I want to link the program so that references to "shdata" will end
up on addresses 64000000 hex and above.

I have tried cc prog.c -o prog -link -Rd 64000000
which did what I wanted but when trying to run the program it fails to
execute and I get "prog: Killed" and a return code 137 (dec).

Anyone have any ideas how do this ?

(I know that shared memory should be accessed through the pointer
 returned by shmat() but thats not the point. The object file
 accessing "shdata" is produces in a language unable to reference
 addresses.)

Thanks in advance for any kind of help !

--
Bj|rn Smith	Compound Systems, phone +46 8 7923689
UUCP:	 	{uunet,mcsun}!sunic!comsys!smith
Internet:	smith@compound.se