1/*
2 * BPF Jit compiler defines
3 *
4 * Copyright IBM Corp. 2012,2015
5 *
6 * Author(s): Martin Schwidefsky <schwidefsky@de.ibm.com>
7 *	      Michael Holzheu <holzheu@linux.vnet.ibm.com>
8 */
9
10#ifndef __ARCH_S390_NET_BPF_JIT_H
11#define __ARCH_S390_NET_BPF_JIT_H
12
13#ifndef __ASSEMBLY__
14
15#include <linux/filter.h>
16#include <linux/types.h>
17
18extern u8 sk_load_word_pos[], sk_load_half_pos[], sk_load_byte_pos[];
19extern u8 sk_load_word[], sk_load_half[], sk_load_byte[];
20
21#endif /* __ASSEMBLY__ */
22
23/*
24 * Stackframe layout (packed stack):
25 *
26 *				    ^ high
27 *	      +---------------+     |
28 *	      | old backchain |     |
29 *	      +---------------+     |
30 *	      |   r15 - r6    |     |
31 * BFP	   -> +===============+     |
32 *	      |		      |     |
33 *	      |   BPF stack   |     |
34 *	      |		      |     |
35 *	      +---------------+     |
36 *	      | 8 byte hlen   |     |
37 * R15+168 -> +---------------+     |
38 *	      | 4 byte align  |     |
39 *	      +---------------+     |
40 *	      | 4 byte temp   |     |
41 *	      | for bpf_jit.S |     |
42 * R15+160 -> +---------------+     |
43 *	      | new backchain |     |
44 * R15+152 -> +---------------+     |
45 *	      | + 152 byte SA |     |
46 * R15	   -> +---------------+     + low
47 *
48 * We get 160 bytes stack space from calling function, but only use
49 * 11 * 8 byte (old backchain + r15 - r6) for storing registers.
50 */
51#define STK_SPACE	(MAX_BPF_STACK + 8 + 4 + 4 + 160)
52#define STK_160_UNUSED	(160 - 11 * 8)
53#define STK_OFF		(STK_SPACE - STK_160_UNUSED)
54#define STK_OFF_TMP	160	/* Offset of tmp buffer on stack */
55#define STK_OFF_HLEN	168	/* Offset of SKB header length on stack */
56
57/* Offset to skip condition code check */
58#define OFF_OK		4
59
60#endif /* __ARCH_S390_NET_BPF_JIT_H */
61