Difference between revisions of "Machine language"

Revision as of 11:24, 14 December 2014

This shows a mapping of x86 machine language to assembler

x86 machine language	assembler command	remark
00 01	add BYTE PTR [bx+di],al
00 41 41	add BYTE PTR [bx+di+0x41],al
0a	.byte 0xa
40	inc ax
41	inc cx
54	push rsp
85 c0	test eax,eax
90	NOP
b8 00 00 00 00	mov eax,0x0
c3	ret
cd 10	int 10
eb fd	short jump to executing the byte before eb
fa	cli	This will clear the interrupt flag in the processor meaning interrupts will not be processed after the flag is set again. This means a high risk - no more keyboard input etc.. So this is a privileged command and may only be executed by the operating system.

@@ Line 9: / Line 9: @@
 |-
 | 0a                   || .byte 0xa ||
+|-
+| 40                   || inc    ax ||
 |-
 | 41                   || inc    cx ||