My application programmer instincts failed when debugging assembler
2 days ago
- #low-level programming
- #debugging
- #assembler
- The author recounts debugging challenges while working on an OS project in assembler, contrasting it with high-level application programming.
- Big error #1: Forgetting a 'ret' in a naked assembler function led to unexpected execution flow, a problem not encountered in application programming.
- Big error #2: An incorrect type in a packed struct caused issues when accessed in assembler, highlighting the lack of abstraction in low-level code.
- Smaller error #3: A typo in '__attribute__' syntax compiled without errors, showcasing C's forgiving parsing.
- Key lesson: Debugging assembler requires focusing on raw memory and registers, not abstractions, which differs from application debugging instincts.
- The author reflects on the power of handling data directly on the stack and the enjoyment of debugging assembler over highly abstracted frameworks.
- Final thoughts: Encouragement for application programmers to explore low-level programming, with a note on ChatGPT's limitations in debugging assembler.