[Top][All Lists]
[Date Prev][Date Next][Thread Prev][Thread Next][Date Index][Thread Index]
Re: [Qemu-devel] Re: playing with qemu usermode emulation on FreeBSD...
From: |
Blue Swirl |
Subject: |
Re: [Qemu-devel] Re: playing with qemu usermode emulation on FreeBSD... |
Date: |
Mon, 12 Oct 2009 22:55:24 +0300 |
On Mon, Oct 12, 2009 at 1:18 AM, Juergen Lock <address@hidden> 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).
> + 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.
> 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.
> +/* XXX this needs to be emulated on non-FreeBSD hosts... */
> +static abi_long do_freebsd_sysctl(abi_ulong namep, int32_t namelen,
> abi_ulong oldp,
> + abi_ulong oldlenp, abi_ulong newp, abi_ulong
> newlen)
What kind of call is this, is it possible to emulate on other BSDs? Is
it important? I'm just wondering if the cross-BSD emulation makes
sense after all. It would make the emulator much simpler if we could
assume that host_bsdness == target_bsdness.
- [Qemu-devel] playing with qemu usermode emulation on FreeBSD..., Juergen Lock, 2009/10/07
- [Qemu-devel] Re: playing with qemu usermode emulation on FreeBSD..., Juergen Lock, 2009/10/11
- Re: [Qemu-devel] Re: playing with qemu usermode emulation on FreeBSD...,
Blue Swirl <=
- Re: [Qemu-devel] Re: playing with qemu usermode emulation on FreeBSD..., Juergen Lock, 2009/10/12
- Re: [Qemu-devel] Re: playing with qemu usermode emulation on FreeBSD..., Juergen Lock, 2009/10/13
- Re: [Qemu-devel] Re: playing with qemu usermode emulation on FreeBSD..., Juergen Lock, 2009/10/16
- Re: [Qemu-devel] Re: playing with qemu usermode emulation on FreeBSD..., Blue Swirl, 2009/10/18
- Re: [Qemu-devel] Re: playing with qemu usermode emulation on FreeBSD..., Juergen Lock, 2009/10/18