Date: Mon, 30 Nov 2015 15:41:34 +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%2BzReo7M1o=MUnKA=H1BC7XohF-uFR73ucRN8oyc-urUkQ@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 again, It seems that this is the last chance to test this patch on other platforms than Rpi, Arndale and Pandaboard. Please check out this https://reviews.freebsd.org/D4037 I will be grateful if you had a chance to test this on something else than the above mentioned. 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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