CMSC 313 — Fall 2015

Midterm Review Guide

CMSC 313 MT Study Guide

The exam will be a mix of True/False, multiple choice, short answers, one or two longer answers, and some short and medium-length coding, as well as understanding provided assembly code.

We will make the toupper.asm program available during the exam.

Midterm Topic Outline:

• Base Conversion--between any two bases
  - focus mainly on binary, hexadecimal, octal
• Data Representation
  • negative numbers: 2's complement, 1's complement, signed magnitude
  • ASCII
  • little endian vs big endian
• - Intel CPU
  • Registers
  • Addressing modes
  • Condition flags
  • Common instructions
• Basic Instructions
  • ADD, SUB, INC, DEC, MOV, NOP
• Comparison & conditional jump instructions
  • JMP, CMP, Jcc
  • signed vs unsigned conditional jumps (e.g. ja vs jg)
• More Arithmetic Instructions
  • NEG, MUL, DIV
• Logical (bit manipulation) Instructions
  • AND, OR, NOT, SHL, SHR, SAL, SAR, ROL, ROR, RCL, RCR
• Subroutine Instructions
  • PUSH, POP, CALL, RET
• NASM
  • How to assemble
  • .data, .bss, .text sections
  • dd, dw, db, resd, resw, resb directives
  • %define!
• System calls for read & write
• Interrupts (general principles)