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

[M. Warner Losh]

In message: <address@hidden>
            Alexander Graf <address@hidden> writes:
: 
: 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 ;-).

Kinda.

The system calls are mostly similar between the BSDs, but do vary for
syscalls added since 4.4BSD Lite-2.

Warner