Difference between revisions of "Machine language"

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Line 15: Line 15:
 
|-
 
|-
 
| 41                  || inc    cx ||
 
| 41                  || inc    cx ||
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|-
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| 42                  || inc    dx ||
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|-
 +
| 43                  || inc    bx ||
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|-
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| 44                  || inc    sp ||
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|-
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| 45                  || inc    bp ||
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|-
 +
| 46                  || inc    si ||
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|-
 +
| 47                  || inc    di ||
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|-
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| 48                  || dec    ax ||
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|-
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| 49                  || dec    cx ||
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|-
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| 4a                  || dec    dx ||
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|-
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| 4b                  || dec    bx ||
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|-
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| 4c                  || dec    sp ||
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|-
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| 4d                  || dec    bp ||
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|-
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| 4e                  || dec    si ||
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|-
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| 4f                  || dec    di ||
 
|-
 
|-
 
| 54                  || push  rsp ||
 
| 54                  || push  rsp ||

Revision as of 10:32, 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.