Difference between revisions of "Machine language"

Revision as of 11:32, 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
00 ff	add bh,bh
0a	.byte 0xa
40	inc ax
41	inc cx
42	inc dx
43	inc bx
44	inc sp
45	inc bp
46	inc si
47	inc di
48	dec ax
49	dec cx
4a	dec dx
4b	dec bx
4c	dec sp
4d	dec bp
4e	dec si
4f	dec di
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 15: / Line 15: @@
 |-
 | 41                   || inc    cx ||
+|-
+| 42                   || inc    dx ||
+|-
+| 43                   || inc    bx ||
+|-
+| 44                   || inc    sp ||
+|-
+| 45                   || inc    bp ||
+|-
+| 46                   || inc    si ||
+|-
+| 47                   || inc    di ||
+|-
+| 48                   || dec    ax ||
+|-
+| 49                   || dec    cx ||
+|-
+| 4a                   || dec    dx ||
+|-
+| 4b                   || dec    bx ||
+|-
+| 4c                   || dec    sp ||
+|-
+| 4d                   || dec    bp ||
+|-
+| 4e                   || dec    si ||
+|-
+| 4f                   || dec    di ||
 |-
 | 54                   || push   rsp ||