Difference between revisions of "Machine language"

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

Revision as of 10:24, 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.