到底是什么含义要由协处理器来解释的，语法的含义就是你所说的那样。
Syntax
CDP{<cond>} <coproc>, <opcode_1>, <CRd>, <CRn>, <CRm>, <opcode_2>
CDP2 <coproc>, <opcode_1>, <CRd>, <CRn>, <CRm>, <opcode_2>
where:
<cond> Is the condition under which the instruction is executed. The conditions are defined
in The condition field on page A3-3. If <cond> is omitted, the AL (always) condition
is used.
CDP2 Causes the condition field of the instruction to be set to 0b1111. This provides
additional opcode space for coprocessor designers. The resulting instructions can
only be executed unconditionally.
<coproc> Specifies the name of the coprocessor, and causes the corresponding coprocessor
number to be placed in the cp_num field of the instruction. The standard generic
coprocessor names are p0, p1, ..., p15.
<opcode_1> Specifies (in a coprocessor-specific manner) which coprocessor operation is to be
performed.
<CRd> Specifies the destination coprocessor register for the instruction.
<CRn> Specifies the coprocessor register that contains the first operand.
<CRm> Specifies the coprocessor register that contains the second operand.
<opcode_2> Specifies (in a coprocessor-specific manner) which coprocessor operation is to be
performed.
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