From: Trevor Scroggins <trevor.scroggins@gmail.com>
To: gcc@gcc.gnu.org
Subject: CONSTANT_POOL_BEFORE_FUNCTION has no effect in tm.h?
Date: Sun, 05 Jul 2009 20:56:00 -0000 [thread overview]
Message-ID: <ca05b9360907051356u109be34fo77e478519a5ecc9b@mail.gmail.com> (raw)
Hello, all. I'm attempting to port GCC 4.4.0 to a new m68k target. The
target begins execution in the first byte of the first text section.
Adding '#define CONSTANT_POOL_BEFORE_FUNCTION 0' in my target's tm.h
seems like the simplest way to avoid execution of read-only data;
however, defining the constant has no effect on compilation. (Note,
custom or missing startup code is common, so I can't work around it
there.)
The only references to CONSTANT_POOL_BEFORE_FUNCTION are in varasm.c,
and the only target current using the definition is pdp11--not exactly
current. Is CONSTANT_POOL_BEFORE_FUNCTION still being used, or have I
hit upon a section of dead code? Is there a simple way to relocate
read-only data to the end of a function without writing a
target-specific reorg routine? Jumping over the data in a prologue
might be an easy, quick and dirty solution, but the target is a
memory-constrained system, and that seems wasteful.
Thanks,
Trev
next reply other threads:[~2009-07-05 20:56 UTC|newest]
Thread overview: 11+ messages / expand[flat|nested] mbox.gz Atom feed top
2009-07-05 20:56 Trevor Scroggins [this message]
2009-07-06 6:14 ` Ian Lance Taylor
2009-07-06 16:29 ` Trevor Scroggins
2009-07-06 17:01 ` Ian Lance Taylor
2009-07-06 17:11 ` Trevor Scroggins
2009-07-06 18:29 ` Trevor Scroggins
2009-07-06 18:45 ` Ian Lance Taylor
2009-07-10 22:19 ` Trevor Scroggins
2009-07-10 22:20 ` Fwd: " Trevor Scroggins
2009-07-10 23:38 ` Ian Lance Taylor
2009-07-10 23:48 ` Trevor Scroggins
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