Date: Mon, 25 Jan 2016 19:06:38 +0100 From: Zbigniew Bodek <zbb@semihalf.com> To: "freebsd-arm@freebsd.org" <freebsd-arm@freebsd.org> Subject: Re: RFC: HW watchpoints and single stepping for ARMv6/v7 Message-ID: <CAG7dG%2ByJRj3-c4ZcBzv%2BruMmMwMsZc%2BnEWQNYk7UdkQwH2pEow@mail.gmail.com> In-Reply-To: <CAG7dG%2BxBoL63mWG8cK%2BFh2jRyfBOsxXfWt4aWtwpyrXt3aOW_g@mail.gmail.com> References: <CAG7dG%2BwpDk7ADEMkxE2qidmESBGLreK-GgCUdHhD1DkHw7zd9w@mail.gmail.com> <CAG7dG%2BxBoL63mWG8cK%2BFh2jRyfBOsxXfWt4aWtwpyrXt3aOW_g@mail.gmail.com>
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Hello, Thank you all for testing. Went upstream: r294740 Best regards zbb 2015-10-31 17:21 GMT+01:00 Zbigniew Bodek <zbb@semihalf.com>: > Hello again, > > I should have post some more information about testing this patch. Here it > goes: > ------------------------------------------------------------------ > One can enter kernel debugger by one of those: > > press: ~, ctrl + b > or > type: sysctl -w debug.kdb.enter=1 > > You can then set a HW watchpoint on any memory location at <address> > by invoking following command in KDB: > db> hwatch <address>, <size> > > <size> parameter is optional, the default is 4. > > To display watchpoints: > db> show watch > > To remove watchpoint: > db> dhwatch <address> > > Press "c" to continue. > > ------------------------------------------------------------------ > While in KDB you can step through the kernel code using "s" BUT you > need to apply a dependent patch: https://reviews.freebsd.org/D4036 > otherwise you will cause the kernel panic. > > Thanks again > zbb > > 2015-10-30 17:25 GMT+01:00 Zbigniew Bodek <zbb@semihalf.com>: > > Hello, > > > > We would like to add HW watchpoints and HW single step support to ARMv6 > kernel. > > Please check this review: https://reviews.freebsd.org/D4037 > > > > Since there are differences between debug architectures on ARM (v6, > > v6.1, v7, v7.1) I would like to ask for some testing on your machines. > > I was able to test this on Pandaboard and Arndale but please check > > whether this works on your targets as well. > > > > Rise a red flag if you see any issues or in worst case scenario - > > "undefined instruction" error. > > > > Best regards > > zbb >
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