x86 fasm

x86-64/hello.asm

@@ -0,0 +1,19 @@
+format ELF64 executable 3
+
+segment readable executable
+
+entry main
+
+main:
+	lea rsi, [msg]			; load effective address of msg into rdi
+	mov rax, 0x01 			; move 1 into rax (write syscall)
+	mov rdi, 1				; stdout = 1
+	mov rdx, 14				; add length to rdx register
+	syscall
+
+	mov rdi, 0				; 0 return code
+	mov rax, 0x3c			# exit syscall number
+	syscall
+
+segment readable writable
+msg	db "Hello world!", 10, 0

x86-64/minimum/minimum.asm

@@ -0,0 +1,47 @@
+;###############################
+;
+; MINIMUM IN X64
+;
+;##############################
+
+; =============================
+; Find smallest number
+; rax = current item
+; rbx = index of data_items
+; rcx = smallest item found
+; rdi = return value
+; =============================
+
+format ELF64 executable 0
+
+segment readable executable
+
+entry main
+main:
+	mov rbx, 0
+	mov rax, [data_items + rbx * 8]
+	mov rcx, rax
+
+loop_through:
+	cmp rax, 255
+	je exit
+	inc rbx
+
+	mov rax, [data_items + rbx * 8]
+	cmp rax, rcx
+	jge loop_through
+
+	mov rcx, rax
+	jmp loop_through
+
+print: 
+	mov rax, 0x01
+	mov rdi, 1
+	mov esi 
+
+exit:
+	mov rax, 0x3c
+	syscall
+
+segment readable writable
+	data_items dq 3, 67, 34, 222, 45, 75, 54, 34, 44, 33, 22, 11, 66, 255

x86/minimum/Makefile

@@ -0,0 +1,3 @@
+default:
+	as minimum.asm --32 -o minimum.o
+	gcc -o minimum.elf -m32 minimum.o -nostdlib

x86/minimum/minimum.asm

@@ -0,0 +1,32 @@
+# FIND SMALLEST NUMBER
+# edi = index of data_items
+# ebx = smallest item found
+# eax = current item 
+
+.global _start
+.intel_syntax noprefix
+.section .text
+
+_start:
+	mov edi, 0									# move 0 to edi (first index)
+	mov eax, [data_items + edi * 4]				# move first number to eax
+	mov ebx, eax								# move eax to ebx
+
+start_loop:
+	cmp eax, 255								# compare eax to 0
+	je loop_exit								# if eax == 0, jump to loop_exit
+	inc edi										# increment edi by 1
+
+	mov eax, [data_items + edi * 4]				# move next number to eax
+	cmp eax, ebx								# compare smallest item (ebx) to current item (eax)
+	jge start_loop								# if ebx is greater than eax, jump to start loop
+
+	mov ebx, eax								# move eax to ebx
+	jmp start_loop								# jump back to start_loop
+
+loop_exit:
+	mov eax, 1 									# move 1 to eax (syscall number)
+	int 0x80									# kernel interrupt
+
+.section .data
+	data_items: .long 3, 67, 34, 222, 45, 75, 54, 34, 44, 33, 22, 11, 66, 255