/sys$common/syshlp/helplib.hlb MACRO, VAX MACRO Assembler, Instructions, MFPR  *Conan The Librarian (sorry for the slow response - running on an old VAX)

    Purpose:        Move from processor register - access
                    internal privileged registers
    Format:         opcode procreg.rl,dst.wl
    Operation:      if {PSL<current-mode> NEQ 0} then {reserved
                    instruction fault}; dst = PRS[procreg]
    C. Codes:       N = {dst LSS 0}, Z = {dst EQL 0}, V = 0, C = C

                    C. Codes not affected if destination is not
                    replaced.
    Exceptions:     Reserved operand, privileged instruction
    Opcode:         DB    MFPR     Move from processor register
    Description:    The specified register is stored in dst. The first
                    operand procreg is a longword that contains the
                    register number. Execution may have register
                    specific side effects. A reserved operand fault
                    can occur if the register does not exist. A
                    reserved instruction fault will occur if MFPR
                    is executed in other than kernel mode.

  Additional Information (explode) :

• Processor Registers