arm中CPSR_C的说明

MSR - Load specified fields of the CPSR or SPSR with an immediate constant, or from the contents of a general-purpose register.


Syntax:


MSR{cond} <psr>_<fields>, #immed_8r MSR{cond} <psr>_<fields>, Rm where: cond is an optional condition code. <psr> is either CPSR or SPSR. <fields> specifies the field or fields to be moved. <fields> can be one or more of:


c control field mask byte (PSR[7:0]) x extension field mask byte (PSR[15:8]) s status field mask byte (PSR[23:16) f flags field mask byte (PSR[31:24]). immed_8r is an expression evaluating to a numeric constant. The constant must correspond to an 8-bit pattern rotated by an even number of bits within a 32-bit word. Rm is the source register.


C 控制域屏蔽字节(psr[7:0])
X 扩展域屏蔽字节(psr[15:8])
S 状态域屏蔽字节(psr[23:16])
F 标志域屏蔽字节(psr[31:24])