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You're reading from  Mastering Reverse Engineering

Product typeBook
Published inOct 2018
PublisherPackt
ISBN-139781788838849
Edition1st Edition
Tools
Linux
Concepts
Reverse Engineering
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Author (1)
Reginald Wong
Reginald Wong
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Reginald Wong

Reginald Wong has been in the software security industry for more than 15 years.Currently, Reggie is a lead anti-malware researcher at Vipre Security, a J2 Global company, covering various security technologies focused on attacks and malware. He previously worked for Trend Micro as the lead for the Heuristics team, dealing with forward-looking malware detection. Aside from his core work, he has also conducted in-house anti-malware training for fresh graduates. He is currently affiliated with CSPCert.ph, Philippines' CERT, and is a reporter for Wildlist.org. He has also been invited to speak at local security events, including Rootcon.
Read more about Reginald Wong

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x86

Like any other programming language, assembly language has its own variables, syntax, operations, and functions. Every line of code is processes a small amount of data. In other words, every byte is read or written per line of code.

 

Registers

In programming, processing data requires variables. You can simply think of registers as variables in assembly language. However, not all registers are treated as plain variables, but rather, each register has a designated purpose. The registers are categorized as being one of the following:

  • General purpose registers
  • Segment registers
  • Flag registers
  • Instruction pointers

In x86 architecture, each general purpose register has its designated purpose and is stored at WORD size, or 16 bits, as follows:

  • Accumulator (AX)
  • Counter (CX)
  • Data (DX)
  • Base (BX)
  • Stack pointer (SP)
  • Base pointer (BP)
  • Source index (SI)
  • Destination index (DI)

For registers AX, BX, CX, and DX, the least and most significant bytes can be accessed by smaller registers. For AX, the lower 8 bits can be...

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Mastering Reverse Engineering
Published in: Oct 2018Publisher: PacktISBN-13: 9781788838849
© 2018 Packt Publishing Limited All Rights Reserved

Author (1)

author image
Reginald Wong

Reginald Wong has been in the software security industry for more than 15 years.Currently, Reggie is a lead anti-malware researcher at Vipre Security, a J2 Global company, covering various security technologies focused on attacks and malware. He previously worked for Trend Micro as the lead for the Heuristics team, dealing with forward-looking malware detection. Aside from his core work, he has also conducted in-house anti-malware training for fresh graduates. He is currently affiliated with CSPCert.ph, Philippines' CERT, and is a reporter for Wildlist.org. He has also been invited to speak at local security events, including Rootcon.
Read more about Reginald Wong

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