UMBC CMSC 313, Computer Organization & Assembly Language, Fall 2003, Section 0101

i386 Assembly Language II

Thursday 09/11, 2001

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Assigned Reading in Murdocca & Heuring:   

Assigned Reading in Neveln:  6.1-6.5

Assigned:   

Due:   

Topics Covered:

• Slides are available in PDF: Slides05.pdf
• Discussed Project 1.
• Reviewed i386 basic architecture.
• Reviewed "toupper.asm". Used gdb debugger to trace through the execution of the program.
• i386 Instruction set overview.
• CISC versus RISC design philosophies.
• How to read the friendly manual, including the notation for common addressing modes.
• The EFLAGS register. Flags we care about: OF, SF, ZF, CF.
• The basic instructions: ADD, SUB, INC, DEC, MOV, NOP.
• Branching instructions: unconditional and conditional jumps.
• The CMP (compare) instruction, signed versus unsigned jumps.

Programs shown:

• We reviewed toupper.asm. The debugging session is also available.