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assembly - What is the expansion of the MSR and MRS instructions in ARM . . . Special Purpose Registers are architecturally defined internal state of the processor, such as the ALU flags, the exception model state, security controls, etc These are distinct from the r0-r14 'general purpose' registers which are available to the main part of the instruction set
Documentation - Arm Developer This MRS 32-bit Thumb instruction is available in ARMv7-A and ARMv7-R There are no 16-bit Thumb versions of these instructions ARM Architecture Reference Manual
ARM assembly: MRS and MSR instructions - Programmer All MRS command: Execute the status register CPSR and SPSR Read operation The working status of the current processor can be obtained by reading CPSR Reading the SPSR register can obtain the processor state before entering the exception (because there is only the SPSR register in the exception mode)
[ARM] MRS MSR instruction - Programmer Sought The ARM instruction set provides two instructions to directly control the Program State Register (PSR) The MRS instruction is used to transfer the value of CPSR or SPSR to a register; on the contrary, MSR transfers the content of a register to CPSR or SPSR The combination of these two instructions can be used to read write CPSR and SPSR
The use of arm assembly instructions MSR and MRS The MRS instruction is used to read the contents of the status register into the general register When an exception allows nesting, it is necessary to save the SPSR corresponding to the current processor mode before entering the exception interrupt and occurring after entering the nested interrupt
Documentation - Arm Developer The Arm Developer Program brings together developers from across the globe and provides the perfect space to learn from leading experts, take advantage of the latest tools, and network
Use a system counter | Arm Learning Paths There are two Arm instructions that allow access to system registers These are MSR to write a system register and MRS to read a system register These are the only two instructions required for counting Using assembly for system counter access If you only need to count time cycles, then the system counter can be used You can do this from