$ show jserv/min-dl
min-dl is a minimal ELF dynamic linker implementation that loads shared libraries, performs relocations, resolves symbols, and runs init/fini constructors without depending on glibc's ld-linux runtime. The codebase provides a clean API (lib-support.h) for loading ELF objects, symbol lookup, PLT resolution, and constructor/destructor execution. It supports multiple architectures (x86_64, ARM, AArch64, RISC-V) through architecture-specific headers and includes a comprehensive test suite validating functionality across platforms. The implementation demonstrates strong engineering practices in ELF parsing, memory management, error handling, and cross-platform support.
The LLM identified 2 files worth highlighting for reuse:
Defines a clean, portable API for loading ELF shared objects, resolving symbols, and executing constructors/destructors. Isolated from implementation details, depends only on stdint.h and conditionally included architecture headers. Demonstrates non-obvious skill in separating concerns (loading, symbol resolution, PLT handling, init/fini) while providing extensibility via function pointers.
Implements core dynamic linker functionality: ELF loading, segment mapping, BSS initialization, dynamic section processing (hash tables, relocation tables), symbol lookup (SysV/GNU hash), and relocation resolution (with lazy binding via PLT). Showcases non-obvious craftsmanship in ELF binary handling, memory protection management, and cross-architecture relocation type support while maintaining strict error checking.