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Re: x86 leal quirk
- From: Ulrich Drepper <drepper at redhat dot com>
- To: Richard Henderson <rth at twiddle dot net>
- Cc: binutils at gcc dot gnu dot org
- Date: Mon, 23 Sep 2002 15:33:04 -0700
- Subject: Re: x86 leal quirk
- References: <20020923152308.A28797@twiddle.net>
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Richard Henderson wrote:
> leal %gs:j@NTPOFF, %eax
>
> I guess I can see how it kinda makes sense, encoding-wise,
> but it'd be nice if it at least gave a warning, since it
> doesn't really do what you expect it to do.
I understand completely where you come from, having been bitten by the
same bug.
But where would you stop?
.byte 0x65
leal j@NTPOFF, %eax
What is the assembler supposed to do with that? Or even something as
sick as
jne 1f
.byte 0x65
1: leal j@NTPOFF, %eax
And while we're at it
leal %ds:j@NTPOFF, %eax
(or %cs or %es). There is no guarantee that those segments have a zero
offset.
- --
- ---------------. ,-. 1325 Chesapeake Terrace
Ulrich Drepper \ ,-------------------' \ Sunnyvale, CA 94089 USA
Red Hat `--' drepper at redhat.com `------------------------
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