MIPS32 (PIC32) assembly and machine language

This is a listing of notes and readings for our discussion of MIPS32.

PIC32 in CSCI 255 — an overview
Easy Expressions — C to C
Chapter 10 to chapter 16 of Programmed Introduction to MIPS Assembly Language
Some examples
- grade = grade + 30 ;
- grade = grade + 30000000 ;
- z = a*x*x + b*x + c ;
- div256 = x >> 8 ;
- div256 = x >>> 8 ; /* Java only */
- PORTB &= ~(B00100000) ; /* Arduino */
- Swapping variables without a temp
Relational and logical operators — C to C
Control structures — C to C
Some examples
- done = x < y ;
- done = y < x ;
- if (x < y && y < z) max = z ;
A serious example
Chapter 17 and chapter 18 of Programmed Introduction to MIPS Assembly Language
A look at the MIPS instruction set, paying attention to the problem of encoding a 32-bit address within a 32-bit instruction
Instruction encoding
- Addresses
  - Memory layout — text, stack, data, heap
  - Compile/Assemble, link and load — Where will it be located?
  - How will it be located — relatively!
    - Local variables – relative to the stack pointer
    - Global variables – relative to the global pointer
    - Class and structure fields – relative to a base register
    - Instructions – relative to the program counter
    - Nearby locations – relative to current page or segment
- Notes for University of Washington CSE 378
- On-line MIPS converter
- MIPS Reference Sheet from University of Arizona ECE 369
- MIPS32^® Instruction Set Quick Reference
- A small table for class

count = 0 ;
while (x != 1) {
  if (x%2 == 1) {
    x = 3*x + 1 ;
  } else {
    x = x/2 ;
  }
  ++count ;
}

What’s left?

The following topics will be covered in Chapter 6.