After testing:
# gcc inlineasm.c
inlineasm.c: Assembler messages:
inlineasm.c:7: Error: suffix or operands invalid for `out'
[r...@debian-johnny] ~/workspace/test
# cat inlineasm.c
#include <stdio.h>
int main ()
{
unsigned int val = 5, tmp = 10;
asm volatile ("outb $0x27, %%al"
:
: "a" (0xb2), "b"(val), "c" (tmp)
);
}
It seems the source of outb instruction cannot be a constant. Is
there a AT&T instructions document for x86?
BRs, H. Johnny
> Why not just:
> ("outb $0x27, %%al" : : "a" (0xb2), "b"(val), "c" (tmp));
> --
> js
> Faculty of Informatics, Masaryk University
> Suse Labs, Novell
>
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