Date: Sat, 14 Nov 1998 11:04:28 -0800 From: Mike Smith <mike@smith.net.au> To: Ruslan Ermilov <ru@ucb.crimea.ua> Cc: Robert Nordier <rnordier@nordier.com>, FreeBSD Hackers <hackers@FreeBSD.ORG> Subject: Re: FreeBSD on i386 memory model Message-ID: <199811141904.LAA06709@dingo.cdrom.com> In-Reply-To: Your message of "Sat, 14 Nov 1998 19:15:56 %2B0200." <19981114191556.A17660@ucb.crimea.ua>
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> > FWIW, here's a small standalone i386 assembler program:
> >
> > main: call .+0x5
> > popl %ebp
> > subl $0x5,%ebp
> > pushl $msg.1-msg
> > leal msg-main(%ebp),%eax
> > pushl %eax
> > pushl $0x1
> > movl $0x4,%eax
> > call .+0x5 <-- why this one?
> > lcall $0x7,$0x0
> > pushl $0x0
> > movl $0x1,%eax
> > call .+0x5 <-- and this one?
> > lcall $0x7,$0x0
> > msg: .ascii "hello, world!\n"
> > msg.1:
>
> Unfortunately, I can't compile it, as(1) gives the following:
>
> {standard input}: Assembler messages:
> {standard input}:5: Error: Unimplemented segment type 0 in parse_operand
> {standard input}:10: Error: operands given don't match any known 386 instruction
> {standard input}:14: Error: operands given don't match any known 386 instruction
>
> It seems that as(1) doesn't understand ``lcall $SECTION, $OFFSET''.
> At least on my 2.2.1, 2.2.5 and 2.2.7+ machines:
No, it doesn't. You can either upgrade to a newer assembler, or
do it the "old" way:
#define LCALL(x,y) .byte 0x9a ; .long y; .word x
Note that on 3.0 systems we use int 0x80 for kernel entry, as it's
faster.
--
\\ Sometimes you're ahead, \\ Mike Smith
\\ sometimes you're behind. \\ mike@smith.net.au
\\ The race is long, and in the \\ msmith@freebsd.org
\\ end it's only with yourself. \\ msmith@cdrom.com
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