A.70 write state register, A.71 deprecated instructions, A.71.10 store barrier – FUJITSU Implementation Supplement Fujitsu SPARC64 V User Manual
Page 70: Write state register 59 deprecated instructions 59, Store barrier 59
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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
MEMBAR
s for all memory accesses.
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