Moving and consolidating repos

x86_64/stack/stask.asm

@@ -0,0 +1,168 @@
+section .data
+	SYS_WRITE	equ 1
+	STD_IN		equ 1
+	SYS_EXIT	equ 60
+	EXIT_CODE	equ 0
+
+	NEW_LINE	db 0xa
+	WRONG_ARGC	db "Must be two command line argument", 0xa
+
+section .text
+	global	_start
+
+_start:
+	;; rcx - argc
+	pop	rcx
+
+	;;
+	;; Check argc
+	;;
+	cmp	rcx, 3
+	jne	argcError
+
+	;;
+	;; start to sum arguments
+	;;
+
+	;; skip argv[0] - program name
+	add	rsp, 8
+
+	;; get argv[1]
+	pop	rsi
+	;; convert argv[1] str to int
+	call	str_to_int
+	;; put first num to r10
+	mov	r10, rax
+	;; get argv[2]
+	pop	rsi
+	;; convert argv[2] str to int
+	call	str_to_int
+	;; put second num to r11
+	mov	r11, rax
+	;; sum it
+	add	r10, r11
+
+	;;
+	;; Convert to string
+	;;
+	mov	rax, r10
+	;; number counter
+	xor	r12, r12
+	;; convert to string
+	jmp	int_to_str
+
+;;
+;; Print argc error
+;;
+argcError:
+	;; sys_write syscall
+	mov	rax, 1
+	;; file descritor, standard output
+	mov	rdi, 1
+	;; message address
+	mov	rsi, WRONG_ARGC
+	;; length of message
+	mov	rdx, 34
+	;; call write syscall
+	syscall
+	;; exit from program
+	jmp	exit
+
+
+;;
+;; Convert int to string
+;;
+int_to_str:
+	;; reminder from division
+	mov	rdx, 0
+	;; base
+	mov	rbx, 10
+	;; rax = rax / 10
+	div	rbx
+	;; add \0
+	add	rdx, 48
+	;; push reminder to stack
+	push	rdx
+	;; go next
+	inc	r12
+	;; check factor with 0
+	cmp	rax, 0x0
+	;; loop again
+	jne	int_to_str
+	;; print result
+	jmp	print
+
+;;
+;; Convert string to int
+;;
+str_to_int:
+	;; accumulator
+	xor	rax, rax
+	;; base for multiplication
+	mov	rcx,  10
+next:
+	;; check that it is end of string
+	cmp	[rsi], byte 0
+	;; return int
+	je	return_str
+	;; mov current char to bl
+	mov	bl, [rsi]
+	;; get number
+	sub	bl, 48
+	;; rax = rax * 10
+	mul	rcx
+	;; ax = ax + digit
+	add	rax, rbx
+	;; get next number
+	inc	rsi
+	;; again
+	jmp	next
+
+return_str:
+	ret
+
+
+;;
+;; Print number
+;;
+print:
+	;;;; calculate number length
+	mov	rax, 1
+	mul	r12
+	mov	r12, 8
+	mul	r12
+	mov	rdx, rax
+	;;;;
+
+	;;;; print sum
+	mov	rax, SYS_WRITE
+	mov	rdi, STD_IN
+	mov	rsi, rsp
+	;; call sys_write
+	syscall
+	;;
+
+	;; newline
+	jmp	printNewline
+
+;;
+;; Print number
+;;
+printNewline:
+	mov	rax, SYS_WRITE
+	mov	rdi, STD_IN
+	mov	rsi, NEW_LINE
+	mov	rdx, 1
+	syscall
+	jmp	exit
+
+;;
+;; Exit from program
+;;
+exit:
+	;; syscall number
+	mov	rax, SYS_EXIT
+	;; exit code
+	mov	rdi, EXIT_CODE
+	;; call sys_exit
+	syscall