65 lines
2.4 KiB
Markdown
65 lines
2.4 KiB
Markdown
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---
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title: Instructions
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TARGET DECK: Obsidian::STEM
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FILE TAGS: x86-64
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tags:
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- x86-64
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---
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## Overview
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x86-64 instructions are designed so that commonly used instructions and those with fewer operands are encoded in a smaller number of bytes. Instructions range in length from 1 to 15 bytes.
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x86-64 assembly comes in two flavors: ATT and Intel. ATT is most common in Linux systems so I focus on that. The most important distinction between the two is operand ordering: Intel syntax lists multiple operands in reverse order compared to ATT.
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%%ANKI
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Basic
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x86-64 assembly comes in what two formats?
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Back: ATT and Intel.
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Reference: Bryant, Randal E., and David O'Hallaron. *Computer Systems: A Programmer's Perspective*. Third edition, Global edition. Always Learning. Pearson, 2016.
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<!--ID: 1710959313804-->
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END%%
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%%ANKI
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Basic
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Which x86-64 assembly format does Linux use?
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Back: ATT.
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Reference: Bryant, Randal E., and David O'Hallaron. *Computer Systems: A Programmer's Perspective*. Third edition, Global edition. Always Learning. Pearson, 2016.
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<!--ID: 1710959313810-->
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END%%
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%%ANKI
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Basic
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Which x86-64 assembly format does Microsoft use?
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Back: Intel.
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Reference: Bryant, Randal E., and David O'Hallaron. *Computer Systems: A Programmer's Perspective*. Third edition, Global edition. Always Learning. Pearson, 2016.
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<!--ID: 1710959313814-->
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END%%
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%%ANKI
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Basic
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What is the "most confusing" difference between ATT and Intel assembly?
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Back: Multiple operands in one are listed in reverse order relative to the other.
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Reference: Bryant, Randal E., and David O'Hallaron. *Computer Systems: A Programmer's Perspective*. Third edition, Global edition. Always Learning. Pearson, 2016.
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<!--ID: 1710959313818-->
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END%%
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%%ANKI
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Basic
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What term describes assembly lines with a leading `.`?
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Back: Directives.
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Reference: Bryant, Randal E., and David O'Hallaron. *Computer Systems: A Programmer's Perspective*. Third edition, Global edition. Always Learning. Pearson, 2016.
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<!--ID: 1710959313822-->
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END%%
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%%ANKI
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Basic
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Assembly directives are important for what two programs?
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Back: The assembler and the linker.
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Reference: Bryant, Randal E., and David O'Hallaron. *Computer Systems: A Programmer's Perspective*. Third edition, Global edition. Always Learning. Pearson, 2016.
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<!--ID: 1710959313826-->
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END%%
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## References
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* Bryant, Randal E., and David O'Hallaron. *Computer Systems: A Programmer's Perspective*. Third edition, Global edition. Always Learning. Pearson, 2016.
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