Mode registers in ARM state-EEWORLD

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Summary of each mode register in ARM state

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All 37 registers are divided into two categories:

31 general-purpose 32-bit registers (actually all corresponding physical registers)

6 status registers

R8 and R8_fig are different registers

R0-R7 are ungrouped registers. For any processor mode, these registers correspond to the same 32-bit physical registers.

R8-R12 has 2 groups of physical registers, one for FIQ mode and one for other modes (this can speed up FIQ processing)

R13-R14 has 6 groups of physical registers, one for user and system mode, and the rest for 5 exception modes

R13 as stack pointer (sp)

R14 is used as the link register (LR) for subroutine or exception return addresses

R15 Program Counter (PC)

CPSR Program Status Register

SPSR program status save register, only exists in exception mode (only when entering exception mode do you need to back up the program status)

Reference address：Mode registers in ARM state

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