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Function DisasmInstruction

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Disassebles a single CPU instruction.

 

Unit

EDisAsm

 

Syntax

 

Code (Delphi)

function DisasmInstruction(

var Address: PAddress;

const AEncrypt: Boolean = False

): String;

 

Parameters

Address [in, out]

A pointer to CPU instruction. On input: a pointer to CPU instruction to disassemble. On output: a pointer to the next CPU instruction.

 

Return value

Textual representation of disassemled CPU instruction. This includes Address, RAW bytes, instruction itself and optional comments.

 

Remarks

Function disassembles a single CPU instruction, returns its textual representation and advances Address to the next instruction. The last can be used to walk through code while diassembling it.

 

Sample output:

 

Code

006989A2 E805C2F8FF CALL -$073DFB ; ($00624BB0) Unit1.TForm1.CheckVisible

 

• First part ("006989A2" in the above example) repeats Address and it's always 8 hex characters for 32-bit process and 16 hex characters for 64-bit process.
• Second part ("E805C2F8FF" in the above example) indicate RAW instruction bytes. Its size varies from 2 characters (1 byte) up to 30 characters (15 bytes) for x86-32 - depending on actual CPU instruction. These bytes includes any prefix, opcode, MOD/RM byte, SIB byte, displacement bytes, immediate value bytes.
• Third part ("CALL -$073DFB" in the above example) shows actual textual representation of disassembled instruction.
• Fourth part ("; ($00624BB0) Unit1.TForm1.CheckVisible" in the above example; optional) contains an optional comment for the instruction (such as call/jmp destination or string data dump).

 

Note

This hi-level function is a simple combination of low-level DecodeInstruction and InstructionToString. This function is used as base for DisasmFunction function.

 

See also



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Last edited: 2024-12-19
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