What is PSR instruction?
SPARC at Enchanted Learning. The processor state register (PSR) is a one-word register used to keep track of various aspects of the state of the CPU that are not stored elsewhere. It is composed of a number of bit fields, which are simply located together for convenience in a single 32-bit register.
What are MRS and MSR instructions?
Usage. The MRS instruction transfers the contents of VFPsysreg into Rd . The MSR instruction transfers the contents of Rd into VFPsysreg .
What is Mrs instruction in ARM?
ARM deprecates reading the CPSR endianness bit (E) with an MRS instruction. The CPSR execution state bits, other than the E bit, can only be read when the processor is in Debug state, halting debug-mode. The condition flags can be read in any mode on any processor.
What is Mrs in assembly language?
MRS (system coprocessor register to ARM register)
What is main stack pointer?
Main Stack Pointer (MSP) is the default stack pointer. It is used in the Thread mode when the CONTROL bit[1] (SPSEL) is 0, and it is always used in Handler mode. Stack operations like PUSH and POP instructions, and most instructions that use SP (R13) use the currently selected stack pointer.
What is function of PSR register?
The Current Program Status Register (CPSR) holds processor status and control information.
What is stack pointer in C?
A stack pointer is a small register that stores the address of the last program request in a stack. When a data item is “pulled” or “popped” from the top of a stack, the item is copied from the address of the stack pointer, and the stack pointer decrements to the next available item at the top of the stack.
How does ARM licensing work?
Every chip that contains ARM IP has a royalty associated with it. The royalty is typically 1 – 2% of the selling price of the chip. In cases of a POP license, the royalty is actually paid by the foundry and not the customer. The royalty is calculated per wafer and it works out to roughly a 0.5% adder per chip sold.