Hi,

Attached a patch to get cross compiled go binaries to run on 9vx and
native Plan 9.

I tried the 9vx-0.12 binaries from http://swtch.com/9vx on a x86-64
linux, but they don't contain support for the CMPXCHG instruction.
After recompiling 9vx from rminnich branch, I can get hello.go to run
correctly both on 9vx and a Plan 9 terminal inside qemu-kvm with this
patch.

Unfortunately rfork seems to be broken (on the 9vx); The PUSHAL, POPAL
instructions are not supported so I had to comment out
PUSHAL
CALL	runtime·emptyfunc(SB)
POPAL
in src/runtime/plan9/386/sys.s, and then 9vx crashes:

% goroutines
9vx panic: kernel fault: signo=11 addr=0[ffffffffbf44a000] 1 eip=0
esp=7f37b5eecd70
aborting, to dump core.

I have no idea what is causing it to die, I've tried adding a bunch of
INT $3 to see how far in the flow I can get, but all I get this:

9vx panic: unknown trap/intr: 0x203
aborting, to dump core.

for an INT $3 just before
CALL	SI	// fn()

Pavel