ref: 6b84c3a6548f1c577948763b0a09a7b6e2460e04
dir: purgatorio/lib9/lock-MacOSX-power.s
#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)