CPU Registers are small amounts of memory located on the processor. They provide a fast way to process data.
x86 registers
General purpose registers
32 bit
16 bit
8 high bit
8 low bit
description
eax
ax
ah
al
accumulator
ebx
bx
bh
bl
base
ecx
cx
ch
cl
counter
edx
dx
dh
dl
data
Segment registers
16 bit
description
cs
code segment
ds
data segment
es, fs, gs
extra segment
ss
stack segment
Index registers
32 bit
16 bit
description
esi
si
source index
edi
di
destination index
Pointer registers
32 bit
16 bit
description
ebp
bp
base pointer
esp
sp
stack pointer
eip
ip
index pointer
EFLAGS register
bit
label
description
0
cf
carry flag
2
pf
parity flag
4
af
auxiliary flag
6
zf
zero flag
7
sf
sign flag
8
tf
trap flag
9
if
interrupt flag
10
df
direction flag
11
of
overflow flag
12-13
iopl
i/o priviledge level
14
nt
nested task flag
16
rf
resume flag
17
vm
virtual 8086 mode flag
18
ac
alignment check flag
19
vif
virtual interrupt flag
20
vip
virtual interrupt pending
21
id
id flag
Control registers
Debug registers
dr0
dr1
dr2
dr3
dr4
dr5
dr6
dr7
Test registers
Pmode segmentation registers
gdtr
global descriptor table register
idtr
interrupt descriptor table register
ldtr
local descriptor table register
tr
task register
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