Search results
Results From The WOW.Com Content Network
The program counter (PC), [1] commonly called the instruction pointer (IP) in Intel x86 and Itanium microprocessors, and sometimes called the instruction address register (IAR), [2] [1] the instruction counter, [3] or just part of the instruction sequencer, [4] is a processor register that indicates where a computer is in its program sequence.
The operating system BRK or COP handler would retrieve the value of the program counter pushed to the stack, decrement it and read from the resulting memory location to get the signature. [8] [9] After converting the signature to a zero-based index, a simple lookup table can be consulted to load the program counter with the address of the proper
The program status word [a] (PSW) is a register that performs the function of a status register and program counter, and sometimes more. The term is also applied to a copy of the PSW in storage. The term is also applied to a copy of the PSW in storage.
A process control block (PCB), also sometimes called a process descriptor, is a data structure used by a computer operating system to store all the information about a process. When a process is created (initialized or installed), the operating system creates a corresponding process control block, which specifies and tracks the process state (i ...
r15 is the program counter, and not usable as a general purpose register; r13 is the stack pointer; r8–r13 can be switched out for others (banked) on a processor mode switch. Older versions had 26-bit addressing, [35] and used upper bits of the program counter (r15) for status flags, making that register 32-bit. ARM 32-bit (Thumb) 8: 16
The CPU knows what machine code to execute, based on its internal program counter. The program counter points to a memory address and is changed based on special instructions which may cause programmatic branches. The program counter is typically set to a hard coded value when the CPU is first powered on, and will hence execute whatever machine ...
The program counter (PC) is a register that holds the memory address of the next instruction to be executed. After each instruction copy to the memory address register (MAR), the PC can either increment the pointer to the next sequential instruction, jump to a specified pointer, or branch conditionally to a specified pointer. [2]
A status register, flag register, or condition code register (CCR) is a collection of status flag bits for a processor.Examples of such registers include FLAGS register in the x86 architecture, flags in the program status word (PSW) register in the IBM System/360 architecture through z/Architecture, and the application program status register (APSR) in the ARM Cortex-A architecture.