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- Stack push and pop
- ==================
- Document conventions
- --------------------
- The ``push()`` and ``pop()`` instructions accept as their argument a register set containing
- a subset, or possibly all, of the general-purpose registers R0-R12 and the link register (lr or R14).
- As with any Python set the order in which the registers are specified is immaterial. Thus the
- in the following example the pop() instruction would restore R1, R7 and R8 to their contents prior
- to the push():
- * push({r1, r8, r7}) Save three registers on the stack.
- * pop({r7, r1, r8}) Restore them
- Stack operations
- ----------------
- * push({regset}) Push a set of registers onto the stack
- * pop({regset}) Restore a set of registers from the stack
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