linux-kernel - Re: [PATCH 2/7] KVM: arm: guest debug, define API headers

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Message-ID: <CAFEAcA-ikeiciAh4RXpKQQ_pY9FRePxR7nEBUEjcaaxB0ZAAtA@mail.gmail.com>
Date:	Tue, 25 Nov 2014 17:13:04 +0000
From:	Peter Maydell <peter.maydell@...aro.org>
To:	Paolo Bonzini <pbonzini@...hat.com>
Cc:	Alex Bennée <alex.bennee@...aro.org>,
	kvm-devel <kvm@...r.kernel.org>,
	arm-mail-list <linux-arm-kernel@...ts.infradead.org>,
	"kvmarm@...ts.cs.columbia.edu" <kvmarm@...ts.cs.columbia.edu>,
	Christoffer Dall <christoffer.dall@...aro.org>,
	Marc Zyngier <marc.zyngier@....com>,
	Alexander Graf <agraf@...e.de>,
	"J. Kiszka" <jan.kiszka@...mens.com>,
	David Hildenbrand <dahi@...ux.vnet.ibm.com>,
	Bharat Bhushan <r65777@...escale.com>, bp@...e.de,
	Catalin Marinas <catalin.marinas@....com>,
	Will Deacon <will.deacon@....com>,
	open list <linux-kernel@...r.kernel.org>
Subject: Re: [PATCH 2/7] KVM: arm: guest debug, define API headers

On 25 November 2014 at 17:05, Paolo Bonzini <pbonzini@...hat.com> wrote:
> So there is no register that says "this breakpoint has triggered" or
> "this watchpoint has triggered"?

Nope. You take a debug exception; the syndrome register tells
you if it was a bp or a wp, and if it was a wp the fault address
register tells you the address being accessed (if it was a bp
you know the program counter, obviously). The debugger is expected
to be able to figure it out from there, if it cares.

-- PMM
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