ref: 9532b43d320db70875771836dd170e645306b923
dir: /sys/src/libthread/xincmips.s/
/* * R4000 user level lock code */ #define LL(base, rt) WORD $((060<<26)|((base)<<21)|((rt)<<16)) #define SC(base, rt) WORD $((070<<26)|((base)<<21)|((rt)<<16)) #define NOOP WORD $0x27 #ifdef oldstyle TEXT xadd(SB), $0 MOVW R1, R2 /* address of counter */ loop: MOVW n+4(FP), R3 /* increment */ LL(2, 1) NOOP ADD R1,R3,R3 SC(2, 3) NOOP BEQ R3,loop RET #endif TEXT _xinc(SB), $0 MOVW R1, R2 /* address of counter */ loop: MOVW $1, R3 LL(2, 1) NOOP ADD R1,R3,R3 SC(2, 3) NOOP BEQ R3,loop RET TEXT _xdec(SB), $0 MOVW R1, R2 /* address of counter */ loop1: MOVW $-1, R3 LL(2, 1) NOOP ADD R1,R3,R3 MOVW R3, R1 SC(2, 3) NOOP BEQ R3,loop1 RET