Memory Addressing

Notes

• Jorgensen chapter 8
• We have seen mov r8, [label]
• Just a little formality
• mov [ imm + reg * imm + imm]
  • In general, remember when accessing an array the formula is
  • A[i] = baseadd + i * size_of(element) + offset into element
• These are in byte addresses, not bits.
• Think of an array of structures (classes)

  • struct MyDataT {
        short value;
        char letter;
    };
    
    MyDataT ary[3];

  • The base address will be the entire record
  • The offset for the first field will be 0 bytes
  • The offset for the second field will be 2 bytes (endiness)
  • And one byte will be padding.
• ary.asm is a simple array
• ary2.asm is the array of structures from above.