[Qemu-devel] QEMU under FreeBSD

[Brion Vibber]

Since my fast x86 box is running FreeBSD 5.2, I thought I'd give QEMU a 
whirl under it. It doesn't compile natively yet, but the 0.5.2 i386 
Linux binary is pretty much willing to run. I had to manually brand the 
executables as Linux:
  brandelf -t Linux /usr/local/bin/qemu*

System emulation works; I loaded up the FreeDOS and Linux images for a 
few minutes, and successfully ran nbench in the Linux image (about 15x 
slower than optimized native code). qemu-fast fails mysteriously, 
though; when run with X11 forwarded over SSH it dies with 
"_X11TransSocketINETConnect: Can't get address for localhost". With a 
direct TCP connection or -nographics it initializes the display, then 
hangs using full CPU. It doesn't load the BIOS or the Linux kernel.

A few spot checks on user-mode emulation: qemu-i386 and qemu-arm will 
run the basic commands I tried (even nano-tiny for ARM!), but 
qemu-sparc segfaults and qemu-ppc just hangs at 99% CPU on any commands 
I try.

Attached is a quick and dirty patch to get compilation to go a little 
further on FreeBSD; it ought to do some actual tests in the configure 
script, though, rather than special-casing for `uname` = 'FreeBSD'. The 
makefile requires gmake rather than BSD make, and the documentation 
needs texi2html installed (available in ports). Detection for SDL seems 
to fail also, I haven't looked into that.

Naturally it all falls down when it gets to syscall.c... probably 
simpler to run the Linux binary, as the FreeBSD kernel already does 
Linux syscall translation for us. ;)

The patched source compiles to the same binaries as the unpatched 
version on my Linux box.

-- brion vibber (brion @ pobox.com)

bsd-fix.diff
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