From mboxrd@z Thu Jan 1 00:00:00 1970 From: pbonzini@redhat.com (Paolo Bonzini) Date: Tue, 25 Nov 2014 18:22:32 +0100 Subject: [PATCH 2/7] KVM: arm: guest debug, define API headers In-Reply-To: References: <1416931805-23223-1-git-send-email-alex.bennee@linaro.org> <1416931805-23223-3-git-send-email-alex.bennee@linaro.org> <5474B6BC.2060309@redhat.com> Message-ID: <5474BAD8.7010307@redhat.com> To: linux-arm-kernel@lists.infradead.org List-Id: linux-arm-kernel.lists.infradead.org On 25/11/2014 18:13, Peter Maydell wrote: > On 25 November 2014 at 17:05, Paolo Bonzini 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. That's already good enough---do the KVM_DEBUG_EXIT_* constants match the syndrome register, or if not why? Paolo