Tag · psABI

Four stages have only read input. This lab writes output for the first time: plan a minimal executable image, serialize the ELF header and two program headers by hand, and let the Linux kernel run it and return 42.

Follow a runnable Linux program from an unresolved call to four final instruction bytes. Distinguish section offsets, file offsets, P, and next RIP before deriving S+A-P; then explore negative displacements, absolute pointers, addends, overflow, and instruction relaxation.