From: Russ Cox <rsc@swtch.com>
To: Fans of the OS Plan 9 from Bell Labs <9fans@9fans.net>
Cc: charles.forsyth@gmail.com
Subject: Re: [9fans] 6a bug
Date: Thu, 17 Nov 2011 11:07:40 -0500 [thread overview]
Message-ID: <CADSkJJU2s1r8Qi=F9eT=+i2mCatxB+c_70teMBkQ3ToOsazGDA@mail.gmail.com> (raw)
In-Reply-To: <ccbc861901e3a2d4cfd944c7bcb815aa@brasstown.quanstro.net>
On Wed, Nov 16, 2011 at 7:50 PM, erik quanstrom <quanstro@quanstro.net> wrote:
> well my example is slightly booged then. i just needed a label.
> the point still stands that 6l is not liking the *value*. this actually
> comes from _start64v, and i wanted to simplify it. if you replace
> the given value with $10, it 6l will not complain.
This is a detail of the x86-64 architecture.
An immediate in an arithmetic instruction must
fit in a signed 32-bit int, and this one does not.
You've written an impossible instruction, and the
linker is telling you in own cryptic way.
The assemblers do not know such details, never have.
You need to MOVQ that constant into a register
and then use the register as the argument to ADDQ.
Russ
next prev parent reply other threads:[~2011-11-17 16:07 UTC|newest]
Thread overview: 9+ messages / expand[flat|nested] mbox.gz Atom feed top
2011-11-16 22:25 erik quanstrom
2011-11-16 22:35 ` Charles Forsyth
2011-11-16 22:36 ` Charles Forsyth
2011-11-16 22:50 ` Russ Cox
2011-11-16 23:27 ` Charles Forsyth
[not found] ` <CAOw7k5hJz=F13tUpq7mU3gSnSWr7H=y4rKCN-OUO-FOavBGygA@mail.gmail.c>
2011-11-17 0:50 ` erik quanstrom
2011-11-17 16:07 ` Russ Cox [this message]
2011-11-17 16:13 ` Charles Forsyth
[not found] ` <CADSkJJU2s1r8Qi=F9eT=+i2mCatxB+c_70teMBkQ3ToOsazGDA@mail.gmail.c>
2011-11-17 16:15 ` erik quanstrom
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