Tiny 128 byte ARM ELF Hello World

hello_world_128

hello_xxd

$ xxd hello_world_128

0000000: 7f45 4c46 0101 0100 0000 0000 0000 0000  .ELF............
0000010: 0200 2800 0100 0000 5480 0000 3400 0000  ..(.....T...4...
0000020: b800 0000 0202 0005 3400 2000 0100 2800  ........4. ...(.
0000030: 0400 0300 0100 0000 0000 0000 0080 0000  ................
0000040: 0080 0000 8000 0000 8000 0000 0500 0000  ................
0000050: 0080 0000 0100 8fe2 10ff 2fe1 0120 0349  ........../.. .I
0000060: 0e22 0427 00df 0127 00df 0000 7080 0000  .".'...'....p...
0000070: 4865 6c6c 6f2c 2077 6f72 6c64 0a00 c046  Hello, world...F

make.sh

#! /bin/sh
as -mthumb -R -o shell.o -k shell.s &&  ld -o shell shell.o && objdump -d shell && strip shell

shell.s

.data
hello_world:
    .asciz "Hello, world\n"

len_hi = . - hello_world

.section .text
.global _start
_start:
    //Switch to thumb for smaller code
    .code 32
    add r0, pc, #1
    bx r0
    .code 16
    //write(1,&hello_world,strlen(hello_world));
    mov r0, #1
    ldr r1, =hello_world
    ldr r2, =len_hi
    mov r7, #4
    svc #0
    //exit(0)
    mov r7, #1
    svc #0