git: purgatorio

ref: 1f6de2fe3823cc6e749b8254187e81e20589bae8
dir: /lib9/lock-MacOSX-power.s/

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#include <architecture/ppc/asm_help.h>

LEAF(__tas)
	sync
	mr	r4,r3
	addi    r5,0,0x1
1:
	lwarx	r3,0,r4
	cmpwi   r3,0x0
	bne-    2f
	stwcx.	r5,0,r4
	bne-    1b		/* Lost reservation, try again */
2:
	sync
	blr
END(__tas)