The patch at http://people.freebsd.org/~nwhitehorn/compat_freebsd32.diff (pre-generated freebsd32 syscalls stuff is included, which will be done in two steps on commit) provides groundwork for supporting 32-bit compatibility for 64-bit MIPS and PowerPC systems. It has been tested on amd64 and powerpc64, and compile-tested on ia64. There are two main parts to the patch:

1) COMPAT_IA32 is renamed COMPAT_FREEBSD32, in analogy to COMPAT_LINUX32, etc. This requires updating kernel configurations, but is less painful than filling machine-independent bits of the kernel with #if defined(COMPAT_IA32) || defined(COMPAT_PPC32) || defined(COMPAT_MIPS32) || ..., and is no less descriptive than the old name.

2) Modifications to the freebsd32 compat layer to support big-endian architectures.

I would appreciate any comments, bugs, or test results on ia64.
-Nathan
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