NAME
compat_netbsd32 —
setup procedure for
32-bit compatibility on 64-bit platforms
DESCRIPTION
The
compat_netbsd32 module allows
NetBSD/sparc64 to run
NetBSD/sparc executables, and
NetBSD/amd64 to run
NetBSD/i386 executables.
To use
compat_netbsd32, one must either have
COMPAT_NETBSD32
and
EXEC_ELF32
in the kernel, or load the compat_netbsd32 and exec_netbsd32 kernel modules.
Static executables typically need no additional setup. Dynamic binaries require
the dynamic linker plus shared libraries. Most of these files will need to be
placed under
/emul/netbsd32.
The easiest method of installing support for these is via the
emulators/netbsd32_compat14,
emulators/netbsd32_compat15, and
emulators/netbsd32_compat16 packages, provided in the
NetBSD packages collection. These install 32-bit a.out
and ELF compatibility libraries, respectively. The details of what is actually
necessary for correct operation are given below. This obviously is handled by
the emulator packages.
For a.out compatibility,
/usr/libexec/ld.so from a 32-bit
distribution is required to exist as
/emul/netbsd32/usr/libexec/ld.so. For 32-bit ELF
compatibility,
/usr/libexec/ld.elf_so needs to be in
/emul/netbsd32/usr/libexec/ld.elf_so.
The shared libraries for a.out binaries do not live under the
/emul/netbsd32 directory, but under the
/emul/aout directory, where the a.out dynamic linker will
find them.
BUGS
A list of things which fail to work in compatibility mode should be here.
IPC is not well supported.
sysctl(3) is not well
supported.