From: Mukesh Rathor <mukesh.rathor@oracle.com>
To: "Xen-devel@lists.xensource.com" <Xen-devel@lists.xensource.com>
Subject: [help] rsp in case of interrupt/exception in ring0
Date: Tue, 23 Feb 2010 19:39:57 -0800 [thread overview]
Message-ID: <20100223193957.33c3e13e@mantra.us.oracle.com> (raw)
Hi,
can someone help me understand this.
When a cpu is in hyp code and int/exception comes in, how/where is rsp
saved? According to intel manual if there's no ring transition, then
the cpu doesn't save ss/rsp.
Following trail from entry.S to show_registers(), I don't see where
regs->rsp is loaded, yet show_registers() displays it happily.
show_stack() uses it.
This also means that regs->rsp is actually going
to prev frame where orig hyp function was executing.
thanks,
Mukesh
next reply other threads:[~2010-02-24 3:39 UTC|newest]
Thread overview: 3+ messages / expand[flat|nested] mbox.gz Atom feed top
2010-02-24 3:39 Mukesh Rathor [this message]
2010-02-24 8:35 ` [help] rsp in case of interrupt/exception in ring0 Jan Beulich
2010-02-25 4:42 ` Mukesh Rathor
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