September 2015
Beginner
330 pages
7h 10m
English
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Registers
The microprocessor has a set of internal memory scratchpads called registers. These are divided into categories and sub-functions. For 32-bit designs, the general-purpose registers, or rather multipurpose registers, (E is for extended) are EAX, EBX, ECX, EDX, EBP, ESI, EDI, and ESP. Their 16-bit counterparts are AX, BX, CX, DX, BP, SI, DI, and SP
Four of them have the following 8-bit subdivisions, where H means High and L means Low:
- AX = AH,AL
- BX = BH,BL
- CX = CH,CL
- DX = DH,DL
For 64-bit programming, the general-purpose registers are RAX, RBX, RCX, RDX, RBP, RSI, RDI, and RSP:
- RAX (addressable as EAX/AX/AH/AL) plays the standard role of an accumulator. It is also used as the placeholder for the return value of a function call. All registers ...
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