Date: Thu, 8 Sep 2016 16:05:16 +0100 From: Andrew Turner <andrew@fubar.geek.nz> To: Ed Schouten <ed@nuxi.nl> Cc: src-committers <src-committers@freebsd.org>, svn-src-all@freebsd.org, svn-src-head@freebsd.org Subject: Re: svn commit: r305607 - head/sys/arm64/arm64 Message-ID: <20160908160516.4bfe3045@zapp> In-Reply-To: <CABh_MKmiEFrbTY%2BZMsh2yq8NANcE_ZSYbwL2UV2KFEVRMNoUgw@mail.gmail.com> References: <201609081253.u88Cr18b036987@repo.freebsd.org> <CABh_MKmiEFrbTY%2BZMsh2yq8NANcE_ZSYbwL2UV2KFEVRMNoUgw@mail.gmail.com>
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On Thu, 8 Sep 2016 16:48:45 +0200 Ed Schouten <ed@nuxi.nl> wrote: > Hi Andrew, > > 2016-09-08 14:53 GMT+02:00 Andrew Turner <andrew@freebsd.org>: > > Trap msr/mrs instructions. These are privileged arm64 > > instructions and shouldn't normally be used. > > It depends on which system register is being used, right? System > registers like TPIDR_EL0 are accessed by userspace all the time. > Correct, the trap is only hit when userspace doesn't have permission to access the register. Andrew
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