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Release 1.0, 1 July 2002 F. Chapter A Instruction Definitions: SPARC64 V Extensions 59
A.70 Write State Register
In SPARC64 V, a WRPCR instruction will cause a
privileged_action
exception if
PSTATE.PRIV =0 and PCR.PRIV =1. If PSTATE.PRIV =0 and PCR.PRIV =0,
WRPCR causes a
privileged_action
exception only when an attempt is made to change
(that is, write 1 to) PCR.PRIV (impl. dep. #250).
A.71 Deprecated Instructions
The deprecated instructions in A.71 of Commonality are provided only for
compatibility with previous versions of the architecture. They should not be used in
new software.
A.71.10 Store Barrier
In SPARC64 V, STBAR behaves as NOP since the hardware memory models always
enforce the semantics of these MEMBARs for all memory accesses.