In the following inline assembly code, my input parameters need to be
prefixed with "c" rather than "r".
I.e. "c0" can be considered an alias for r0, and "c1" for r1, etc. I
found several instances of inline assembly
in the linux kernel which punted when it came to this - assuming that
the function doesn't get inlined, and they
hard-code c0 and c1 in cases similar to the one below.
I've found current documentation on arm-specific constraints, which
don't mention coprocessor registers,
and I tried "c" as below, hoping that it would work. The "mrc"
instruction syntax requires "c" registers for its
source operands, although they are actually the regular registers.
Any advice?
unsigned foo( unsigned a, unsigned b)
{
int rc;
__asm__( "mrc p6,0,%0,%1,%2,5": "=r"(rc): "c"(a),"c"(b));
return( rc);
}
if not inlined, this needs to assemble as "mrc p6,0,r0,c0,c1,5", but I
really don't want to hard-code c0 and c1"
