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notes.md

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Stack stuff

  • No base pointer register
    • All local vars are referenced relative to the stack pointer
  • Stack grows upward

Calling Convention

Caller

  • Arguments are placed in r0, r1, and r2
    • More than 3 arguments is not supported
  • The call instruction pushes pc + 1 (the address of the instruction after the call instruction) and jumps to the callee

Callee

  • Arguments are stored in local variables if necessary (e.g. push r0)
  • Extra space for local variables is made on the stack at the beginning of the function if necessary (e.g. incr3 2)
  • The (optional) return value is placed in r0
  • At the end of the function, r3 should be equal to its value at the start of the function
  • The ret instruction pops the return address from the stack and jumps there