nx_x86_64_loadstore_test.nx

nx_x86_64_loadstore_test.nx -- session 2 smoke for load/store/GEP. Hand-builds a program that: 1. allocates a 32-byte stack buffer via subq $32, %rsp 2. stores a sequence of bytes into the buffer via different store widths (movb / movw / movl / movq) 3. loads them back via the corresponding load widths with the expected sign-extension behaviour 4. computes an expected output via a couple of adds, then writes the result via sys_write Test value: write the byte 'X' (0x58) to stdout, then exit 0. - movb $0x58, -1(%rbp) ; store byte - movzbq -1(%rbp), %rsi ; load unsigned byte into address-form We adapt: build a small in-stack buffer "X\n" and write 2 bytes.