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- 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
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