ref: bd773dee09460f5d77c96f2fe3d34ec5ee0b54ce
dir: /sys/src/libc/arm64/atomic64.s/
#define ISH (2<<2|3) /* get variants */ TEXT agetv+0(SB),1,$0 LDAR (R0), R0 DMB $ISH RETURN /* set variants */ TEXT aswapv+0(SB),1,$0 MOV 0x08(FP), R1 MOV R0, R2 _setv: LDXR (R2), R0 STXR R1, (R2), R3 CBNZW R3, _setv DMB $ISH RETURN /* inc variants */ TEXT aincv+0(SB),1,$0 MOV 0x08(FP), R1 MOV R0, R2 _incv: LDXR (R2), R0 ADD R1, R0, R3 STXR R3, (R2), R4 CBNZW R4, _incv DMB $ISH MOV R3, R0 RETURN /* cas variants */ TEXT acasv+0(SB),1,$0 MOV 0x08(FP), R1 MOV 0x10(FP), R2 DMB $ISH _casv: LDXR (R0), R3 CMP R1, R3 BNE _casvf STXR R2, (R0), R4 CBNZW R4, _casv MOV $1, R0 DMB $ISH RETURN _casvf: CLREX MOV $0, R0 DMB $ISH RETURN