Date: Wed, 14 Oct 2009 00:19:32 +0200 From: Juergen Lock <nox@jelal.kn-bremen.de> To: Juergen Lock <nox@jelal.kn-bremen.de> Cc: Blue Swirl <blauwirbel@gmail.com>, freebsd-emulation@freebsd.org, qemu-devel@nongnu.org, Aleksej Saushev <asau@inbox.ru>, Toni <tonygio04@gmail.com> Subject: Re: [Qemu-devel] Re: playing with qemu usermode emulation on FreeBSD... Message-ID: <20091013221932.GA32808@triton8.kn-bremen.de> In-Reply-To: <20091012222058.GA43121@triton8.kn-bremen.de> References: <20091007220549.GA65997@triton8.kn-bremen.de> <20091011221840.GA55502@triton8.kn-bremen.de> <f43fc5580910121255i626e8c53t3ada32be0aa25a8f@mail.gmail.com> <20091012222058.GA43121@triton8.kn-bremen.de>
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On Tue, Oct 13, 2009 at 12:20:58AM +0200, Juergen Lock wrote: > On Mon, Oct 12, 2009 at 10:55:24PM +0300, Blue Swirl wrote: > > On Mon, Oct 12, 2009 at 1:18 AM, Juergen Lock <nox@jelal.kn-bremen.de> wrote: > > > On Thu, Oct 08, 2009 at 12:05:49AM +0200, Juergen Lock wrote: > > >> I recently noticed there are x86 bsd-user targets now (yeah I totally > > >> missed those commits...) and now got it working a tiny little bit: > > >> I can run > > >> qemu-x86_64 -bsd freebsd /rescue/echo foo bar > > >> here on FreeBSD 8/amd64 and it echoes foo bar as expected, but > > >> segfaults afterwards. :) (in pthread_setcancelstate() invoked from > > >> a guest write() syscall, in case anyone is wondering.) Other things > > >> I tried either exit with errors or segfault as well, and i386 hosts > > >> probably still don't work at all yet. (qemu-i386 here on amd64 does > > >> at least something, but probably needs lock_user() treatment for all > > >> kinds of syscalls, I only tried adding that for sysctl so far.) > > >> > > >> Anyway, here is an emulators/qemu-devel git head snapshot port > > >> update with my current patches (files/patch-bsd-user), feel free to > > >> test/debug/improve: > > >> http://people.freebsd.org/~nox/qemu/qemu-devel-20091007.patch > > >> (For the folks reading this on the qemu list: I shall start doing > > >> `proper' patch submissions later, this is more for the FreeBSD folks > > >> and because I was asked to send what I have...) > > > > > > New version at the same place, which now runs FreeBSD/{i386,sparc64} > > > /rescue/echo on FreeBSD/amd64, the FreeBSD/amd64 target now segfaults > > > in pthread_setcancelstate() invoked from the final writev() tho. > > > Oh and I also uploaded the snapshot tarball so others can now actually > > > build the port too... :) And I have switched to the cpu-exec.c patch > > > posted by Aleksej Saushev on the qemu list and added back amd64 > > > code there. > > > > > > Here is the bsd-user patch again: > > > > Please add Signed-off-by: line and use 'diff -u' (or preferably git diff). > > > Well I wasn't expecting this diff to be committed just yet anyway, > it's still more a wip version... > > > > + if (1 /* bsd_type == target_freebsd */) > > > + regs->rdi = infop->start_stack; > > > > Why the if and comment? > > > > > + if (1 /* bsd_type == target_freebsd */) { > > > + regs->u_regs[8] = infop->start_stack; > > > + regs->u_regs[11] = infop->start_stack; > > > > Same here. > > > Because bsd_type isn't available at these places in the code but > probably should be checked, I still wanted to fix that. (Maybe > make it global?) > I still haven't fixed this... > > > case 0x100: > > > + /* FreeBSD uses 0x141 for syscalls too */ > > > + case 0x141: > > > + if (bsd_type != target_freebsd) > > > + goto badtrap; > > > > You are now also trapping on case 0x100 if bsd_type != target_freebsd, > > which probably breaks other BSDs. > > > Right, thats broken, the 0x141 case should come before the 0x100 > here of course. > ...but this I just fixed, and I added the multiboot.S patch, and fixed the port's cdrom dma disable knob (files/cdrom-dma-patch). (And I added the cpu-exec.c whitspace fix that was already in the patch I posted in the BSD support thread.) New version at the same place, http://people.freebsd.org/~nox/qemu/qemu-devel-20091007.patch and I now also made a shar of the patched port: http://people.freebsd.org/~nox/qemu/qemu-devel-20091007.shar Cheers, Juergen
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