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From bde@kralizec.zeta.org.au Sun Jun 27 01:18:32 1993
Received: from ultima.socs.uts.EDU.AU by bsd.coe.montana.edu (5.67/KAOS-1)
id AA11952; Sun, 27 Jun 93 01:18:32 -0600
Received: by ultima.socs.uts.EDU.AU (5.65+/SMI-3.3)
id AA03033; Sun, 27 Jun 93 17:10:22 +1000
Received: by kralizec.zeta.org.au (4.0/SMI-4.0)
id AA15074; Sat, 26 Jun 93 02:32:58 EST
Date: Sat, 26 Jun 93 02:32:58 EST
From: bde@kralizec.zeta.org.au (Bruce Evans)
Message-Id: <9306251632.AA15074@kralizec.zeta.org.au>
To: nate@bsd.coe.montana.edu
Subject: Re: Trapframe information
Status: OR
tf_isp original esp (probably spare - popal ignores it)
tf_trapno s/w trap no (may be spare - trap.c has already looked at it)
tf_err h/w error code (probably spare - gets discarded before iret)
___fs not stored in 386BSD pcb. Constant anyway unless user has
screwed with it (?).
___gs ditto
___orig_eip in linux, this is on the stack just before the call to the
emulator. The reason that it's not a local variable is to
avoid passing around pointers to it - current->frame (or
whatever) points to everything in the stack frame. The
macros hide a lot of slow memory references
current->frame->var.
>(And I need to see if I can map orig_eip to one of the three that I'm unsure of
>in the BSD sources)
tf_isp is the least evil.
Bruce
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