How to specify the command prefix field, the command field itself, the addressing mode field?
Sleeping Owl
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Ivan1009 Ivan1009
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- @Ivan1009, specify the question, which prefix is needed, which command, which addressing mode? - insolor
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1 answer
The machine command generally looks like this: first the prefixes come, each prefix takes 1 byte, then the command field goes - usually takes 1-2 bytes, then the mod r / m byte can go to indicate the addressing mode, then depending on the field values byte mod r / m can go byte sib (scale-index-base), then there can be a numerical offset or an immediate operand.
On this topic, you can read the following:
- "Disassembling Subtleties (Disassembling in the Mind)" by Chris Kaspersky (pdf)
- The book of Pirogov V. "Assembler and disassembly" chapter "Format of commands of the Intel microprocessor"
- For more information you need to read Intel manuals.
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