Plan 9 from User Space's /usr/local/plan9/src/libthread/Linux-386-asm.s 

.globl _tas
_tas:
	movl $0xCAFEBABE, %eax
	movl 4(%esp), %ecx
	xchgl %eax, 0(%ecx)
	ret

Space Glenda

Copyright © 2005 Lucent Technologies, Russ Cox, MIT.
See license for details.