140 lines
4.1 KiB
NASM
140 lines
4.1 KiB
NASM
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linux_read_system_call = 0
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linux_write_system_call = 1
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linux_open_system_call = 2
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linux_close_system_call = 3
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linux_exit_system_call = 60
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standard_input = 0
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standard_output = 1
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format ELF64 executable 3
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segment readable executable
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main:
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nop
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nop
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nop
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mov rdi, text_data ; text);
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call echo ; echo (
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loop_1:
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cmp [main_x], 16
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jnb loop_1e
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xor rdx, rdx
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mov eax, [main_x]
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mov ebx, 15
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idiv rbx
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cmp edx, 0
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jne n3
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mov rdi, fb
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call echo
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jmp n0
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n3:
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xor rdx, rdx
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mov eax, [main_x]
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mov ebx, 3
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idiv rbx
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cmp edx, 0
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jne n1
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mov rdi, f
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call echo
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jmp n0
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n1:
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xor rdx, rdx
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mov eax, [main_x]
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mov ebx, 5
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idiv rbx
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cmp edx, 0
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jne n2
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mov rdi, b
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call echo
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jmp n0
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n2:
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mov rdi, n
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call echo
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n0:
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inc [main_x]
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jmp loop_1
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loop_1e:
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;
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mov rax, linux_exit_system_call ; <main> return;;
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xor rdi, rdi
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syscall
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;~string_length (character * text):
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;~natural length = 0;
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;~loop (* (text + length++));
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;~return (length);;
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;~48 C7 C7 BD 11 40 00 E8 CA 00 00 00 83 3D F3 10 00 00 10 0F 83 83 00 00 00 48 31 D2 8B 05 E4 10 00 00 BB 0F 00 00 00 48 F7 FB 83 FA 00 75 0E 48 C7 C7
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;~CA 11 40 00 E8 9B 00 00 00 EB 54 48 31 D2 8B 05 C0 10 00 00 BB 03 00 00 00 48 F7 FB 83 FA 00 75 0E 48 C7 C7 D4 11 40 00 E8 77 00 00 00 EB 30 48 31 D2
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;~8B 05 9C 10 00 00 BB 05 00 00 00 48 F7 FB 83 FA 00 75 0E 48 C7 C7 DA 11 40 00 E8 53 00 00 00 EB 0C 48 C7 C7 E0 11 40 00 E8 45 00 00 00 FF 05 6F 10 00
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;~00 E9 70 FF FF FF 48 C7 C0 3C 00 00 00 48 31 FF 0F 05
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;~57 C8 00 00 00 C7 05 48 10 00 00 00 00 00 00 48 31 C0 80 3F 00 74 0B FF 05 3A 10 00 00 48 FF C7 EB F0 C9 8B 05 2E 10 00 00 5F C3
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;~57 C8 00 00 00 E8 C5 FF FF FF 48 89 C2 48 89 FE 48 C7 C7 01 00 00 00 48 C7 C0 01 00 00 00 0F 05 48 31 C0 C9 5F C3
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;~00 00 00 00 01 00 00 00 48 65 79 6F 20 77 6F 72 6C 64 21 0A 00 66 69 7A 7A 62 75 7A 7A 0A 00 66 69 7A 7A 0A 00 62 75 7A 7A 0A 00 6E 75 6D 62 65 72 0A 00
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;~string_length (character * string) > natural:
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;~length: natural = 0;
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;~loop (string [length]) length++;
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;~return (length);;
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string_length: ; string_length
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nop
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nop
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nop
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push rdi
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enter 0, 0
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mov [string_length_length], 0
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xor rax, rax
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loop_0: ; loop_0
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cmp byte [rdi], 0 ; (* (text + length)) != '\0'
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je loop_0e
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inc [string_length_length] ; text + length
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inc rdi ; length++
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jmp loop_0 ; if not go loop_0
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loop_0e:
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leave
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mov eax, [string_length_length]
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pop rdi
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ret ; ;
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;~echo (character * text):
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;~system (linux_write_system_call, standard_output, text, string_length (text));
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;~return;;
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echo: ; echo )
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nop
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nop
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nop
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push rdi
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enter 0, 0
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call string_length ; |
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mov rdx, rax ; | string_length (text)
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mov rsi, rdi ; text
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mov rdi, standard_output ; standard_output
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mov rax, linux_write_system_call ; linux_write_system_call
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syscall ; system (
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xor rax, rax ; return;;
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leave
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pop rdi
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ret ;
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nop
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nop
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nop
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segment readable writable
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; variable
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string_length_length dd 0 ; natural length = 0;
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main_x dd 1 ; integer x = 0;
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; data
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text_data db 'Heyo world!', 10, 0
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fb db 'fizzbuzz', 10, 0
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f db 'fizz', 10, 0
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b db 'buzz', 10, 0
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n db 'number', 10, 0
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