Work through open and closed subroutines, the argument and result registers, and how blBranch with link; writes return address to X30. and retReturn; jumps to Xn (default X30). Halts when X30 is the `__main_return` sentinel. carry the return address.
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Knowledge Check
What is the primary advantage of using an open (inline) subroutine?
Knowledge Check
A program uses the instruction bl to call a subroutine. What instruction would normally be used to return to the calling code?
Knowledge Check
Under the AArch64 procedure call convention, where are the first eight integer or pointer arguments normally passed to a procedure?
Knowledge Check
A subroutine uses a stack frame to keep track of its local data. Which register is conventionally used as the frame pointer in AArch64?
Knowledge Check
What is a key characteristic of a closed subroutine?
Knowledge Check
When a bl instruction calls a subroutine, what happens to the return address?