x86 architecture
debug registers




 
DR0...15
 
name 6
3
6
2
6
1
6
0
5
9
5
8
5
7
5
6
5
5
5
4
5
3
5
2
5
1
5
0
4
9
4
8
4
7
4
6
4
5
4
4
4
3
4
2
4
1
4
0
3
9
3
8
3
7
3
6
3
5
3
4
3
3
3
2
3
1
3
0
2
9
2
8
2
7
2
6
2
5
2
4
2
3
2
2
2
1
2
0
1
9
1
8
1
7
1
6
1
5
1
4
1
3
1
2
1
1
1
0
9 8 7 6 5 4 3 2 1 0
DR0  
breakpoint #0 virtual address
 
 
breakpoint #0 virtual address
 
DR1  
breakpoint #1 virtual address
 
 
breakpoint #1 virtual address
 
DR2  
breakpoint #2 virtual address
 
 
breakpoint #2 virtual address
 
DR3  
breakpoint #3 virtual address
 
 
breakpoint #3 virtual address
 
DR4  
reserved
 
 
reserved
 
DR5  
reserved
 
 
reserved
 
DR6  
reserved
 
1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 R
T
M
B
T
B
S
B
D
S
M
M
B
L
D
1 1 1 1 1 1 1 B
3
B
2
B
1
B
0
DR7  
reserved
 
LEN
3
R/W
3
LEN
2
R/W
2
LEN
1
R/W
1
LEN
0
R/W
0
T
T
T
B
G
D
I
C
E
R
T
M
1 G
E
L
E
G
3
L
3
G
2
L
2
G
1
L
1
G
0
L
0
DR8  
reserved
 
 
reserved
 
DR9  
reserved
 
 
reserved
 
DR10  
reserved
 
 
reserved
 
DR11  
reserved
 
 
reserved
 
DR12  
reserved
 
 
reserved
 
DR13  
reserved
 
 
reserved
 
DR14  
reserved
 
 
reserved
 
DR15  
reserved
 
 
reserved
 
DR16
...
DR31
 
reserved
 
 
reserved
 

note: In LM a LENn value of 10b is no longer reserved. Instead it selects an 8 byte breakpoint.



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