How to pass a #defined constant as an address to the inline assembler
Ian Lance Taylor
ian@zembu.com
Wed Sep 1 07:37:00 GMT 1999
Date: Wed, 01 Sep 1999 10:20:48 +0200
From: Mark Jonas <jonas@informatik.uni-freiburg.de>
unsigned short foo;
#define MODBASE 0xFFFFF000L
#define CNTR1 (MODBASE+0x060A)
asm volatile ("move.w %1,%0" : "=g" (foo) : "g" (CNTR1));
The 'g' constraint permits an immediate operand, and that's what
you're getting. Try using the 'm' constraint instead for CNTR1.
I haven't tried this myself, so I don't know whether it will work.
However, in general I think you need to find the right constraint to
tell gcc to emit a memory address rather than an immediate value.
Ian
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