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