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9–5
RD_PS Read processor status
RD_PS writes the Processor Status (PS) to register R0.
READ_UNQ Read unique context
READ_UNQ reads the hardware process (thread) unique context value, if
previously written by WRITE_UNQ, and places that value in R0.
REI Return from exception or interrupt
The PS, PC, and saved R2..R7 are popped from the current stack and held in
temporary registers. The new PS is checked for validity and consistency. If it
is valid and consistent, the current stack pointer is then saved and a new stack
pointer is selected. Registers R2 through R7 are restored by using the saved
values held in the temporary registers. A check is made to determine if an
AST or interrupt is pending.If the enabling conditions are present for an inter-
rupt or AST at the completion of this instruction, the interrupt or AST occurs
before the next instruction.
REMQHIL Remove from longword queue at header, interlocked
The self-relative queue entry following the header, pointed to by R16, is
removed from the queue, and the address of the removed entry is returned in
R1. The removal is interlocked to prevent concurrent interlocked insertions or
removals at the head or tail of the same queue by another process, in a multi-
processor environment. The removal is a noninterruptible operation.
REMQHILR Remove from longword queue at header, interlocked resident
The queue entry following the header, pointed to by R16, is removed from the
self-relative queue, and the address of the removed entry is returned in R1.
The removal is interlocked to prevent concurrent interlocked insertions or
removals at the head or tail of the same queue by another process, in a multi-
processor environment. The removal is a noninterruptible operation. This
instruction requires that the queue be memory-resident and that the queue
header and elements are quadword-aligned.
REMQHIQ Remove from quadword queue at header, interlocked
The self-relative queue entry following the header, pointed to by R16, is
removed from the queue and the address of the removed entry is returned in
R1. The removal is interlocked to prevent concurrent interlocked insertions or
removals at the head or tail of the same queue by another process, in a multi-
processor environment. The removal is a noninterruptible operation.
Table 9–1 : Unprivileged OpenVMS Alpha PALcode Instruction Summary (Continued)
Mnemonic Operation and Description