1                                  SEGMENT .text
     2                                  GLOBAL _start
     3                                  _start:
     4 00000000 B802000000              	MOV RAX, 2		; open(filename, flags)
     5 00000005 48BF-                   	MOV RDI, filename
     5 00000007 [0000000000000000] 
     6 0000000F 4831F6                  	XOR RSI, RSI		; set flags to 0: RD_ONLY
     7 00000012 0F05                    	SYSCALL
     8 00000014 4883F8FF                	CMP RAX, -1
     9 00000018 7433                    	JE err
    10 0000001A 4889C7                  	MOV RDI, RAX		; file descriptor
    11 0000001D 4831C0                  	XOR RAX, RAX		; read(fd, buf, count)
    12 00000020 48BE-                   	MOV RSI, buf
    12 00000022 [0000000000000000] 
    13 0000002A BA13000000              	MOV RDX, 19		; We read at most 19 bytes
    14 0000002F 0F05                    	SYSCALL
    15 00000031 4883F8FF                	CMP RAX, -1
    16 00000035 7416                    	JE err
    17 00000037 B801000000              	MOV RAX, 1		; write(fd, buf) (buf is already set from previous call)
    18 0000003C BF01000000              	MOV RDI, 1		; standard output
    19 00000041 0F05                    	SYSCALL
    20 00000043 B83C000000              	MOV RAX, 60		; exit(code)
    21 00000048 4831FF                  	XOR RDI, RDI		; success
    22 0000004B 0F05                    	SYSCALL
    23                                  err:
    24 0000004D B83C000000              	MOV RAX, 60		; exit(code)
    25 00000052 BF01000000              	MOV RDI, 1		; 1 (fail)
    26 00000057 0F05                    	SYSCALL
    27                                  	
    28                                  SEGMENT .bss
    29 00000000 <res 00000014>          buf RESB 20
    30                                  
    31                                  SEGMENT .rodata
    32 00000000 66696C6500              filename DB "file",0