nx_nxld.nx

nxld.nx -- Nishi sovereign linker. Replaces gcc-ld in verify.sh. Reads RV64 object files (ELF relocatable), resolves symbols across them, and produces a statically-linked RV64 Linux ELF executable. Scope (v0.0.1): - Single-output static linking (no .so / dynamic linking) - RV64 only (Sv39 virtual memory layout) - ELF relocations: R_RISCV_64, R_RISCV_BRANCH, R_RISCV_JAL, R_RISCV_CALL, R_RISCV_HI20, R_RISCV_LO12_I, R_RISCV_LO12_S, R_RISCV_PCREL_HI20, R_RISCV_PCREL_LO12_I - Single .text section + single .data section + single .bss - Entry point = _start (RV64 Linux convention) - Output base vaddr = 0x10000 (matches elf_writer.nx) Out of scope (v0.0.1): - Section ordering directives - Linker scripts - LTO bytecode handling - Position-independent code - Garbage collection of unreferenced sections - Debug info preservation (DWARF stripped) These are deliberate v0.0.1 limits. v0.1.0 closes them. Pipeline: 1. Open + parse each input ELF (header, sections, symbols, relocs) 2. Group sections by type: .text, .data, .bss 3. Resolve undefined symbols across input objects 4. Lay out output sections (text starts at 0x10000 + 0x1000 header) 5. Apply relocations now that final addresses are known 6. Build output ELF (header + program headers + sections) 7. Write to output file