From: erik quanstrom <quanstro@quanstro.net>
To: 9fans@9fans.net
Subject: Re: [9fans] sysrfork fp bug?
Date: Mon, 21 Nov 2011 17:08:47 -0500 [thread overview]
Message-ID: <1f44256f014adb8ba778c7fdf5951b43@brasstown.quanstro.net> (raw)
In-Reply-To: <CAOw7k5hcpmt26NppfrFENPWS9_g6jD=XMhQzVMeS1usGQrwL0w@mail.gmail.c>
On Mon Nov 21 10:34:15 EST 2011, charles.forsyth@gmail.com wrote:
> registers are dead on entry to a function, so there's no point in saving
> particular values, because they won't be used. on an amd64, however,
> the kernel should
> reset the FP-used flag, to cause the preset values to be set in the high FP
> registers if the fork'd process does touch the FP.
>
why does pc/trap.c:/^syscall take pains to save the fp registers, then?
- erik
next prev parent reply other threads:[~2011-11-21 22:08 UTC|newest]
Thread overview: 9+ messages / expand[flat|nested] mbox.gz Atom feed top
2011-11-21 15:08 erik quanstrom
2011-11-21 15:33 ` Charles Forsyth
[not found] ` <CAOw7k5hcpmt26NppfrFENPWS9_g6jD=XMhQzVMeS1usGQrwL0w@mail.gmail.c>
2011-11-21 15:43 ` erik quanstrom
2011-11-21 23:01 ` erik quanstrom
2011-11-21 15:48 ` erik quanstrom
2011-11-21 22:08 ` erik quanstrom [this message]
2011-11-21 23:14 ` Charles Forsyth
2011-11-21 23:18 ` Charles Forsyth
[not found] ` <CAOw7k5it_OV56ZNnPygDjh+rA=xC-+-x+DJuSWBCBRC-XhXECw@mail.gmail.c>
2011-11-22 1:52 ` erik quanstrom
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