Inline assembler operands on x86
Darryl Dixon
esrever_otua@hotmail.com
Thu Feb 12 02:59:00 GMT 2004
Hi,
I'm trying to define a C function that accepts some variables and uses
them in some x86 assembler. When I try to compile I get:
/tmp/cc7VC4SL.s: Assembler messages:
/tmp/cc7VC4SL.s:16: Error: suffix or operands invalid for `in'
/tmp/cc7VC4SL.s:16: Error: suffix or operands invalid for `mov'
The code in question is:
--------------8<------------
static int set_hci(int eaxvalue, int ebxvalue, int ecxvalue)
{
int outval;
asm ("inb %[baseport],%%al; movb %%ah,%[OUTVAL]" \
:[OUTVAL]"=r"(outval) \
:"a"(eaxvalue), "b"(ebxvalue), "c"(ecxvalue),
[baseport]"r"(BASEPORT));
return outval;
}
--------------8<------------
This code compiles fine if I drop the OUTVAL and baseport operands and just
put raw $values in the asm template. What am I missing here?
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