Strange prelink phenomenon

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#113

From: John Krew
Date: Thu, 29 Sep 2005 19:05

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I was wondering if someone could explain to me the following strange phenomenon.  The scenario has
been simplified to isolate the essential differences between the two contradictory cases.

A simple C program ("Hello world") is compiled.  The object deck output is input to the prelink
utility, followed by the object deck of an assembler program.  The output of the prelink is input to
the linkage editor, producing a load module.

I receive two completely different results, depending on which assembler program is included in the
input to the prelink.  For program ASM1,  the prelink first outputs a CEESTART binary deck, followed
by the binary deck of the C program code, and then that of the asembler routine. The resulting load
module has the CEESTART csect at offset +0 (i.e., the first csect in the module).

For program ASM2, the prelink does not output a CEESTART binary deck, but only the binary deck of
the C program and that of the asembler routine.  The linkage editor then retrieves a copy of
CEESTART from SYSLIB, and the CEESTART csect is at a nonzero offset within the resultant load
module.

By the way, the prelink report (SYSPRINT dataset) in *both* cases indicates that the CEESTART csect
is being output, but in actual fact it is *not* when ASM2 is included in the prelink.  (I also
checked the respective outputs from the prelink to make sure).

Both assembler programs use the EDCPRLG/EDCEPIL macros.

Anybody have a notion of what is going on?

John Krew

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From: John Krew <john_krew@hotmail.com>
Newsgroups: bit.listserv.asm370
Subject: Strange prelink phenomenon
Date: Thu, 29 Sep 2005 21:05:27 +0200
Organization: SAS Inc.
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