NetBSD and the experimental Darwin binary compatibility

This article is outdated and its information may no longer be relevant.

This is a work in progress, attempting to run some mach-o binaries on NetBSD (macppc in this case).

Appeared as a significant change in NetBSD 3.0.

Kernel stuff

/netbsd

Building the kernel with darwin support

Assuming you have set a default proper environment for compiling your kernel: In the /usr/src/sys/arch/YOUR_ARCH/conf/YOUR_CONFIG

At least, you have to enable these options:

options COMPAT_DARWIN # Darwin binary compatibility (experimental) options COMPAT_MACH # Mach compatibility, needed for COMPAT_DARWIN options EXEC_MACHO # Mach-O binary support, needed for COMPAT_MACH

Optionnaly, uncomment the following:

#options DEBUG_DARWIN # COMPAT_DARWIN debugging #options DEBUG_MACH # COMPAT_MACH debugging

After editing your configuration file, you can begin to build the kernel:

config YOUR_CONFIG cd ../compile/YOUR_CONFIG make depend make cp /netbsd /netbsd.old cp netbsd /netbsd

Then reboot..

Assembler messages: Error: bad expression Error: syntax error; found 4' but expected ,’ Error: junk at end of line: `4,0’ Error: bad expression

sysctl interface

By default:

sysctl -a | grep darwin emul.darwin.init.pid = 0 emul.darwin.ioframebuffer.unit = 0 emul.darwin.ioframebuffer.screen = 0 emul.darwin.iohidsystem.mux = 0

In the source code of darwin_sysctl.c, we can read:

/*
 * On Darwin, mach_init is the system bootstrap process. It is responsible
 * for forking the traditional UNIX init(8) and it does the Mach port naming
 * service. We need mach_init for the naming service, but unfortunately, it
 * will only act as such if its PID is 1. We use a sysctl
 * (emul.darwin.init.pid) to fool a given process into thinking its PID is 1.
 * That way we can run mach_init when we want to.
 * Typical use:
 * sysctl -w emul.darwin.init.pid=$$; exec /emul/darwin/sbin/mach_init
 *
 * The same problem exists after mach_init has forked init: the fork libc stub
 * really insist on the child to have PID 2 (if PID is not 2, then the stub
 * will issue bootstrap calls to an already running mach_init, which fails,
 * of course).
 */

darwin_lib

“These libraries are part of the Darwin compatibility option for

NetBSD/powerpc and NetBSD/i386. * * The kernel options EXEC_MACHO', COMPAT_MACH’ and `COMPAT_DARWIN’ must be in your kernel config file for this to work.“ from /usr/pkgsrc/emulators/darwin_lib/DESCR

cd /usr/pkgsrc/emulators/darwin_lib/ make install clean

If the build fails, you will probably need to edit /usr/pkgsrc/emulators/darwin_lib/Makefile and remove the problematic (XFree86) missing rpm in DISTFILES variable. Attempt to run a mach-o binary

No mach_init is present by default, and mach_init has been dropped…

sysctl -w emul.darwin.init.pid=$$ && exec /emul/darwin/sbin/mach_init

At the root of a mounted old darwin iso (ppc), populate the darwin userland shadow root:

scp -r bin sbin usr <NetBSD macppc host>:/emul/darwin

scp -r System/Library <NetBSD macppc host>:/emul/darwin/System

The process in `ps aux’:

USER PID %CPU %MEM VSZ RSS TTY STAT STARTED TIME COMMAND root 412 0.0 0.0 0 0 ttyE0 RW+ - 0:00.00 /emul/darwin/sbin/mach_init

FAIL!

cd /emul/darwin ./usr/bin/uname -a

same state..

root 421 0.0 0.0 0 0 ttyp0 RW+ - 0:00.00 ./usr/bin/uname -a

FAIL!

At this time,

Note: It seems memory is not allocated, an the RW+ status seems curious.

Please, let us know if you have a solution.

Ressources

http://netbsd.gw.com/cgi-bin/man-cgi/man?compat_darwin+8+NetBSD-current http://www.netbsd.org/docs/compat.html#ports http://hcpnet.free.fr/applebsd.html

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