Assembly Language and Low Level Debugging Questions

Skills for debugging and diagnosing problems at the assembly and machine code level. This includes reading disassembly output produced by compilers, mapping high level source to assembly, understanding how compiler optimizations can reorder instructions and eliminate variables, and interpreting stack frames and register contents. Practical debugger skills include setting breakpoints and watchpoints, single stepping at the instruction level, inspecting and modifying registers and memory, interpreting core dumps and crash backtraces, using tools such as GDB, LLDB, objdump, readelf, and addr2line, and leveraging hardware debug features on embedded platforms. Candidates should be able to use assembly-level inspection to verify correctness, find subtle bugs introduced by optimization or calling convention mismatches, and validate fixes or performance changes.