| // testset instruction | |
| //TESTSET is an atomic test-and-set. | |
| //If the lock was not set prior to the TESTSET, cc is set, the lock bit is set, | |
| //and this processor gets the lock. If the lock was set | |
| //prior to the TESTSET, cc is cleared, the lock bit is still set, | |
| //but the processor fails to acquire the lock. | |
| # mach: bfin | |
| .include "testutils.inc" | |
| start | |
| loadsym P0, datalabel; | |
| R0 = 0; | |
| CC = R0; | |
| R0 = B [ P0 ] (Z); | |
| DBGA ( R0.L , 0 ); | |
| TESTSET ( P0 ); | |
| R0 = CC; | |
| DBGA ( R0.L , 1 ); | |
| R0 = B [ P0 ] (Z); | |
| DBGA ( R0.L , 0x80 ); | |
| R0 = 0; | |
| CC = R0; | |
| TESTSET ( P0 ); | |
| R0 = CC; | |
| DBGA ( R0.L , 0 ); | |
| R0 = B [ P0 ] (Z); | |
| DBGA ( R0.L , 0x80 ); | |
| pass | |
| .data | |
| datalabel: | |
| .dw 0 |