Re: [Qemu-devel] [PATCH, RFC] BSD user emulator

[Alexander Graf]

On Aug 30, 2008, at 10:31 AM, Blue Swirl wrote:

> Hi,
>
> This version can actually execute some programs, for example:
>
> ./sparc64-bsd-user/qemu-sparc64 -d in_asm /bin/cat /etc/motd
> OpenBSD 4.4 (GENERIC) #1715: Mon Aug 11 17:55:10 MDT 2008
>
> Welcome to OpenBSD: The proactively secure Unix-like operating system.
>
> Please use the sendbug(1) utility to report bugs in the system.
> Before reporting a bug, please try to reproduce it with the latest
> version of the code.  With bug reports, please try to ensure that
> enough information to reproduce the problem is enclosed, and if a
> known fix for it exists, include that as well.
>
> Something is not correct with errno handling, it could also be a bug
> in CPU emulation:
> /sparc64-bsd-user/qemu-sparc64 -d in_asm /bin/cat /foobar
> cat: /foobar: Undefined error: 0
>
> Some other programs just fail:
> ./sparc64-bsd-user/qemu-sparc64 -d in_asm /bin/ls
> ls: Cannot allocate memory
> ./sparc64-bsd-user/qemu-sparc64 -d in_asm /bin/ksh
> ksh in malloc(): error: chunk overflow
> ./sparc64-bsd-user/qemu-sparc64 -d in_asm /usr/bin/id
> Segmentation fault
> ./sparc64-bsd-user/qemu-sparc64 -d in_asm /sbin/ifconfig
> lo0: flags=8049<UP,LOOPBACK,RUNNING,MULTICAST> mtu 0¸
> ifconfig: getifgroups: Cannot allocate memory
>
> I've cleaned up the patch a bit. Signals, ioctls and structure
> conversions are still unimplemented and as usual, no docs.
>
> I think this is getting ready to be committed pretty soon. Any
> comments, objections?

Just off the top of my head: Shouldn't BSD userspace and Darwin  
userspace emulation be able to share a good bunch of syscalls?
IIRC the positive Darwin syscalls should be some recent FreeBSD  
syscalls that should look pretty similar to OpenBSD syscalls. I might  
be totally wrong here though ;-).

Alex