35.1.7. IA-32 (X86)

 
  THIS SECTION IS UNDER CONSTRUCTION  
 

  


8086:
  


80386DX:
  


80486SX:
  


Pentium:
  




  
  Эволюция 
 

[только Intel]
	8086 ['78] --- > 8088 ['79]
	 |
	 V
	80286 ['82]
	 |
	 V
IA32:	80386DX ['85] -- > 80386SX ['88]
	 |
	 V
	80486 ['89] -- > 80486SX ['91]
	 |
	 V
       Pentium  ['93] --> Pentum w/MMX ['97]
	 |
	 V
      Pentium Pro ['95]
	 |
	 V
      Pentium II ['97] --> Celeron
	 |
	 V
      Pentium III ['99] --> Pentium M
	 |
	 V
      Pentium 4 ['00]



  
  Регистры 
 

 -----------------------------------------------------------------
	eax	ax	al
	ebx	bx	bl
	ecx	cx	cl
	edx	dx	dl
	esi	si
	edi	di
	ebp	bp		<- Frame pointer
	esp	sp
	Note: Floating Point operation processed specially on x86, 'cos
	      of FP. Stack architecture.
	      But also possible to use MMX2 for single operations.
	Zero Register:	None
	Direction:
			<------------
	Memory Access:
		mov	ebx,[eax+ecx+esi*2]
	Immediately Data
		add	ah,23h
	Byte order:		Little-endian
	Instruction Len:	variable 1-15 bytes long
	Main Generations:
	8086+			16-bit
	386+			32-bit

	Регистр флагов:
		13..12	IOPL
		9	IF
		8	TF
		THIS SECTION IS UNDER CONSTRUCTION
	--------------------------------------------------------------	

Форматы обращения к памяти:
	на самом деле архитектура сегментная поэтому зависит от регистра

16bit memory (No 32 bit memory address prefix):
MMM	Default	MM  Field
Field	Sreg	00		01		10		11=MMM is reg 
000	DS	[BX+SI]		[BX+SI+O8]	[BX+SI+O16]
001	DS	[BX+DI]		[BX+DI+O8]	[BX+SI+O16]
010	SS	[BP+SI]		[BP+SI+O8]	[BP+SI+O16]
011	SS	[BP+DI]		[BP+DI+O8]	[BP+DI+O16]
100	DS	[SI]		[SI+O8]		[SI+O16]
101	DS	[DI]		[DI+O8]		[DI+O16]
110	SS	[O16]		[BP+O8]		[BP+O16]
111	DS	[BX]		[BX+O8]		[BX+O16]
Note: MMM=110,MM=00 Default Sreg is DS !!!!

32bit memory (Has 67h 32 bit memory address prefix):
MMM	Default	MM  Field
Field	Sreg	00		01		10		11=MMM is reg 
000	DS	[EAX]		[EAX+O8]	[EAX+O32]
001	DS	[ECX]		[ECX+O8]	[ECX+O32]
010	DS	[EDX]		[EDX+O8]	[EDX+O32]
011	DS	[EBX]		[EBX+O8]	[EBX+O32]
100 see SIB	[SIB]		[SIB+O8]	[SIB+O32]
101	SS	[O32]		[EBP+O8]	[EBP+O32]
110	DS	[ESI]		[ESI+O8]	[ESI+O32]
111	DS	[EDI]		[EDI+O8]	[EDI+O32]
Note: MMM=110,MM=00 Default Sreg is DS !!!!


SIB is (Scale/Base/Index):
  SS  BBB  III
Note: SIB address calculated as :
        =+*(2^(Scale))

Field	Default	Base
BBB     Sreg	Register	Note
000	DS	EAX
001	DS	ECX
010	DS	EDX
011	DS	EBX
100	SS	ESP
101	DS	O32		If MM=00   (Postbyte)
	SS	EBP		If MM<>00  (Postbyte)
110	DS	ESI
111	DS	EDI

Field	Index
III	register	Note
000	EAX
001	ECX
010	EDX
011	EBX
100			Never Index SS can be 00
101	EBP
110	ESI
111	EDI


Field	Scale coefficient
SS      =2^(SS)
00	1
01	2
10	4
11	8
			



  
  Особенности 
 
	CISC микропроцессор с частичной RISC архитектурой
	Little-endian
	Самый сложный набор инструкций из всех
	Расширения Multimedia: MMX,SSE,SSE2,SSE3 {3DNow!}