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