AMD64 registers

Register names, numbers and purposes on the AMD64 architecture running Linux.
For more information see AMD64 ABI.

Dwarf2 number

0

3

2

1

4

5

6

7

8

9

10

11

12

13

14

15

16

Preserved across function calls

Yes

Yes

Yes

Yes

Yes

Yes

Yes

N/A

Function parameter

4^th

3^rd

2^nd

1^st

5^th

6^th

N/A

Return register

1^st

2^nd

N/A

Kernel parameter

#NR

3^rd

2^nd

1^st

5^th

6^th

4^th

N/A

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