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- /*
- * int cas(ulong *p, ulong ov, ulong nv);
- */
- #define CLREX WORD $0xf57ff01f
- #define LDREX(a,r) WORD $(0xe<<28|0x01900f9f | (a)<<16 | (r)<<12)
- /* `The order of operands is from left to right in dataflow order' - asm man */
- #define STREX(v,a,r) WORD $(0xe<<28|0x01800f90 | (a)<<16 | (r)<<12 | (v)<<0)
- TEXT cas+0(SB),0,$0 /* r0 holds p */
- TEXT casp+0(SB),0,$0 /* r0 holds p */
- MOVW ov+4(FP), R1
- MOVW nv+8(FP), R2
- spincas:
- LDREX(0,3) /* LDREX 0(R0),R3 */
- CMP.S R3, R1
- BNE fail
- STREX(2,0,4) /* STREX 0(R0),R2,R4 */
- CMP.S $0, R4
- BNE spincas
- MOVW $1, R0
- RET
- fail:
- // CLREX /* fpiarm in pre-v7 ports needs to emulate this */
- MOVW $0, R0
- RET
- TEXT _xinc(SB), $0 /* void _xinc(long *); */
- TEXT ainc(SB), $0 /* long ainc(long *); */
- spinainc:
- LDREX(0,3) /* LDREX 0(R0),R3 */
- ADD $1,R3
- STREX(3,0,4) /* STREX 0(R0),R3,R4 */
- CMP.S $0, R4
- BNE spinainc
- MOVW R3, R0
- RET
- TEXT _xdec(SB), $0 /* long _xdec(long *); */
- TEXT adec(SB), $0 /* long adec(long *); */
- spinadec:
- LDREX(0,3) /* LDREX 0(R0),R3 */
- SUB $1,R3
- STREX(3,0,4) /* STREX 0(R0),R3,R4 */
- CMP.S $0, R4
- BNE spinadec
- MOVW R3, R0
- RET
- TEXT loadlinked(SB), $0 /* long loadlinked(long *); */
- LDREX(0,0) /* LDREX 0(R0),R0 */
- RET
- TEXT storecond(SB), $0 /* int storecond(long *, long); */
- MOVW ov+4(FP), R3
- STREX(3,0,0) /* STREX 0(R0),R3,R0 */
- RSB $1, R0
- RET
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