Instruction Set Architecture

• Instruction set architecture allows us to use one set of software to interact with multiple different machines in the same way
• ISA’s often interact with the following portions of the computer and move in the following order to accomplish their tasks
  • memory for storage - virtual (cache) or physical
  • instructions - actually moving from one state to the next (ie. function calls)
  • program - the set of specified instructions
  • execution model - when and in what order do we execute all of the instructions that we had specified
• Procedure calling is not specified by the ISA
• The size of the address space is specified by the ISA

GDB

“53” contains an encoding of the register %rbx.

“53” contains an encoding of the push operation.