Запустить, тем более на спор, это пол дела.
Надо же ещё что-то сассемблировать.
На AMD64 это как два байта переслать:

$ cat  fasm_samples/console/00/a00.fasm
; fasm demonstration of writing 64-bit ELF executable
; note that linux from kernel 2.6.??? needs last segment to be writeable
; else segmentation fault is generated
; compiled with fasm 1.66
; syscall numbers: /usr/src/linux/include/asm-x86_64/unistd.h
; kernel parameters:
; r9    ; 6th param
; r8    ; 5th param
; r10    ; 4th param
; rdx    ; 3rd param
; rsi    ; 2nd param
; rdi    ; 1st param
; eax    ; syscall_number
; syscall
;
; return register:
; rax    ; 1st
; rdx    ; 2nd
;
; preserved accross function call: RBX RBP ESP R12 R13 R14 R15
;
; function parameter (when linked with external libraries):
; r9    ; 6th param
; r8    ; 5th param
; rcx    ; 4th param
; rdx    ; 3rd param
; rsi    ; 2nd param
; rdi    ; 1st param
; call library
format ELF64 executable at 0000000100000000h    ; put image over 32-bit limit
segment readable executable
entry $
    mov    edx,msg_size    ; CPU zero extends 32-bit operation to 64-bit
                ; we can use less bytes than in case mov rdx,...
    lea    rsi,[msg]
    mov    edi,1        ; STDOUT
    mov    eax,1        ; sys_write
    syscall
    xor    edi,edi        ; exit code 0
    mov    eax,60        ; sys_exit
    syscall
segment readable writeable
msg db 'Hello 64-bit world!',0xA
msg_size = $-msg

$ fasm  fasm_samples/console/00/a00.fasm
flat assembler  version 1.73.12  (16384 kilobytes memory)
3 passes, 229 bytes.

$ ./fasm_samples/console/00/a00
Hello 64-bit world!

А для RISC-V где вот эти удобства?