does anyone understand the hex representation of x86 the opcodes
http://courses.ece.uiuc.edu/ece390/resources/opcodes.html

eg.

so what does the wrrr mean?

hi back' - this appears to me to be from an instructioni manual where they are trying to explain moving an immediate value (imm) (integer, etc.) to a register (reg). mov reg,imm as in mov ax,0x5.

regarding the 1011wrrr, look at the guide at the top of the spreadsheet on your link for an expaination of the meaning of rrr, mmm, sss, etc. it expains the opcodes for the various x86 instructions like mov, ret, etc.

Bit w means operand size. w=0: 8-bit, w=1: 16/32-bit
Bit field rrr means 3-bit register code, from 0 through 7.

Example:

Attached is program by Svin that lets you play with encoding and see direct translation in mnemonic. It removes all confusion on the matter.

Please, look at the bottom of this page for other such useful tools by Svin.

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Hello bitRAKE! You're still around here? Good to see you again. I doubted you gave up assembly since long time ago. I still remember your great posts at asmcommunity
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