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Tobias Weingartner wrote:
[...]
> One thing your teacher may not know is that x86 assembly includes the
> 32-bit environment, and (now) also a 64-bit environment. However, running
> 16-bit code under OpenBSD i386 is going to be somewhat difficult. We don't
> bother supplying 16-bit services, and only consume 16-bit services (from
the
> bios) for a few things necessary. It is hard, and somewhat error prone.
Linux has a thing called elksemu. It is, basically, a binary loader that will
allow you to run 16-bit ELKS binaries on 32-bit Linux. (ELKS is a
now-moribund
port of a Linux subset to 8086 class machines, using modified Minix
binaries.)
It intercepts int 0x80 and converts the 16-bit ELKS syscalls to 32-bit Linux
ones.
So, write(0, "Hello, world!\n", 14) becomes:
mov ax, 0
mov bx, _label
mov cx, 14
int 0x80
...which is, I believe, exactly what the OP wanted.
elksemu does all the dirty work with the vm86() syscall, which was put in for
dosemu. I know that dosemu works, or at least worked, on NetBSD and FreeBSD
- --- does OpenBSD have this functionality?
- --
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b "There does not now, nor will there ever, exist a programming language in
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