NASM - The Netwide Assembler
NASM Forum => Programming with NASM => Topic started by: maplesirop on April 01, 2013, 05:34:08 PM
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I know how to get the number of bits of an opcode based on the number of instructions, but how do you know the size of the operand field for instance?
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As far as I understand, that information is not something you "get" with code. You need to know what platform you're coding for before you start coding. For example, if you want to write a program for the family of x86 or x86-64 CPU's, you can refer to the Intel manuals for this information. On the other hand, if you want to write a program for an ARM CPU, you would get the manual from ARM