Date: Fri, 20 Jun 2014 17:57:00 -0600 From: Ian Lepore <ian@FreeBSD.org> To: Aleksandr Rybalko <ray@ddteam.net> Cc: freebsd-arm@FreeBSD.org Subject: Re: locore.S and debugging initial stages of kernel Message-ID: <1403308620.20883.288.camel@revolution.hippie.lan> In-Reply-To: <0eac2533-d4bb-4bc6-9ba1-3dae40aa4360@email.android.com> References: <53A3619C.3020505@narod.ru> <776BC360-5D2F-435C-B2B0-38449D4AB56D@bsdimp.com> <1403230772.20883.281.camel@revolution.hippie.lan> <BFE35132-0A10-40E4-835A-0F35D3084F09@FreeBSD.org> <0eac2533-d4bb-4bc6-9ba1-3dae40aa4360@email.android.com>
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On Sat, 2014-06-21 at 01:18 +0300, Aleksandr Rybalko wrote: > On 20 =DE=C5=D2=D7=CE=D1 2014 =D2. 08:23:01 GMT+03:00, Rui Paulo <rpaul= o@FreeBSD.org> wrote: > >On Jun 19, 2014, at 19:19, Ian Lepore <ian@FreeBSD.org> wrote: > > > >> I usually emit single chars by writing directly the console uart > >> register. > > > >I use exactly the same method, but your code looks much better. :-) > > > >-- > >Rui Paulo > > > > > > > >_______________________________________________ > >freebsd-arm@freebsd.org mailing list > >http://lists.freebsd.org/mailman/listinfo/freebsd-arm > >To unsubscribe, send any mail to "freebsd-arm-unsubscribe@freebsd.org" >=20 > Is not it would be better to just load txd address, instead of ORing 2-= 4 times? :-D > WBW > ------ > Aleksandr Rybalko <ray@ddteam.net> >=20 >=20 You mean store the value in memory somewhere, and then at runtime load a pointer to where it's stored using only pc-relative instructions and then loading the actual value using the pointer? Harder to write, the code added for "quick debugging" would be more scattered, and it's actually slower (not that performance really matters here). It could be done as a 1-liner using "=3DVALUE" syntax, but chances are that turns int= o mov,orr,orr. :) -- Ian
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