Initial commit

Dockerfile

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+FROM scratch
+ADD hello /
+CMD ["/hello"]

Makefile

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+hello: hello.asm
+	nasm -o $@ $<
+	chmod +x hello
+
+.PHONY: clean
+clean:
+	-rm -vf hello

hello.asm

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+; this is especially thanks to:
+; http://blog.markloiseau.com/2012/05/tiny-64-bit-elf-executables/
+
+BITS 64
+	org	0x00400000	; Program load offset
+
+; 64-bit ELF header
+ehdr:
+	;  1), 0 (ABI ver.)
+	db 0x7F, "ELF", 2, 1, 1, 0       ; e_ident
+	times 8 db 0                     ; reserved (zeroes)
+
+	dw 2              ; e_type:	Executable file
+	dw 0x3e           ; e_machine:	AMD64
+	dd 1              ; e_version:	current version
+	dq _start         ; e_entry:	program entry address (0x78)
+	dq phdr - $$      ; e_phoff	program header offset (0x40)
+	dq 0              ; e_shoff	no section headers
+	dd 0              ; e_flags	no flags
+	dw ehdrsize       ; e_ehsize:	ELF header size (0x40)
+	dw phdrsize       ; e_phentsize:	program header size (0x38)
+	dw 1              ; e_phnum:	one program header
+	dw 0              ; e_shentsize
+	dw 0              ; e_shnum
+	dw 0              ; e_shstrndx
+
+ehdrsize equ $ - ehdr
+
+; 64-bit ELF program header
+phdr:
+	dd 1              ; p_type:	loadable segment
+	dd 5              ; p_flags	read and execute
+	dq 0              ; p_offset
+	dq $$             ; p_vaddr:	start of the current section
+	dq $$             ; p_paddr:	"		"
+	dq filesize       ; p_filesz
+	dq filesize       ; p_memsz
+	dq 0x200000       ; p_align:	2^11=200000 = section alignment
+
+; program header size
+phdrsize equ $ - phdr
+
+; Hello World!/your program here
+_start:
+
+	; sys_write(stdout, message, length)
+	mov	rax, 1           ; sys_write
+	mov	rdi, 1           ; stdout
+	mov	rsi, message     ; message address
+	mov	rdx, length      ; message string length
+	syscall
+
+	; sys_exit(return_code)
+	mov	rax, 60          ; sys_exit
+	mov	rdi, 0           ; return 0 (success)
+	syscall
+
+	message:
+		db 'Hello from Docker.', 0x0A
+		db 'This message shows that your installation appears to be working correctly.', 0x0A
+		db 0x0A
+		db 'To generate this message, Docker took the following steps:', 0x0A
+		db ' 1. The Docker client contacted the Docker daemon.', 0x0A
+		db ' 2. The Docker daemon pulled the "hello-world" image from the Docker Hub.', 0x0A
+		db '    (Assuming that it was not already locally available.)', 0x0A
+		db ' 3. The Docker daemon created a new container from that image which runs the', 0x0A
+		db '    executable that produces the output you are currently reading.', 0x0A
+		db ' 4. The Docker daemon streamed that output to the Docker client, which', 0x0A
+		db '    placed it in your terminal.', 0x0A
+		db 0x0A
+		db 'To try something more ambitious, you can run an Ubuntu container with:', 0x0A
+		db ' $ docker run -it ubuntu bash', 0x0A
+		db 0x0A
+		db 'For more examples and ideas, visit:', 0x0A
+		db ' http://docs.docker.com/userguide/', 0x0A
+	length: equ	$-message            ; message length calculation
+
+; File size calculation
+filesize equ $ - $$