1 .. contents::
2 .. sectnum::
3
4 ==============================================
5 BPF ABI Recommended Conventions and Guidelines
6 ==============================================
7
8 This is version 1.0 of an informational docume
9 conventions and guidelines for producing porta
10
11 Registers and calling convention
12 ================================
13
14 BPF has 10 general purpose registers and a rea
15 all of which are 64-bits wide.
16
17 The BPF calling convention is defined as:
18
19 * R0: return value from function calls, and ex
20 * R1 - R5: arguments for function calls
21 * R6 - R9: callee saved registers that functio
22 * R10: read-only frame pointer to access stack
23
24 R0 - R5 are scratch registers and BPF programs
25 necessary across calls.
26
27 The BPF program needs to store the return valu
28 ``EXIT``.
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