1/* SPDX-License-Identifier: GPL-2.0 */
 2/*
 3 * BPF Jit compiler defines
 4 *
 5 * Copyright IBM Corp. 2012,2015
 6 *
 7 * Author(s): Martin Schwidefsky <schwidefsky@de.ibm.com>
 8 *	      Michael Holzheu <holzheu@linux.vnet.ibm.com>
 9 */
10
11#ifndef __ARCH_S390_NET_BPF_JIT_H
12#define __ARCH_S390_NET_BPF_JIT_H
13
14#ifndef __ASSEMBLY__
15
16#include <linux/filter.h>
17#include <linux/types.h>
18
 
 
 
19#endif /* __ASSEMBLY__ */
20
21/*
22 * Stackframe layout (packed stack):
23 *
24 *				    ^ high
25 *	      +---------------+     |
26 *	      | old backchain |     |
27 *	      +---------------+     |
28 *	      |   r15 - r6    |     |
29 *	      +---------------+     |
30 *	      | 4 byte align  |     |
31 *	      | tail_call_cnt |     |
32 * BFP	   -> +===============+     |
33 *	      |		      |     |
34 *	      |   BPF stack   |     |
35 *	      |		      |     |
 
 
 
 
 
 
 
 
 
36 * R15+160 -> +---------------+     |
37 *	      | new backchain |     |
38 * R15+152 -> +---------------+     |
39 *	      | + 152 byte SA |     |
40 * R15	   -> +---------------+     + low
41 *
42 * We get 160 bytes stack space from calling function, but only use
43 * 12 * 8 byte for old backchain, r15..r6, and tail_call_cnt.
44 *
45 * The stack size used by the BPF program ("BPF stack" above) is passed
46 * via "aux->stack_depth".
47 */
48#define STK_SPACE_ADD	(160)
49#define STK_160_UNUSED	(160 - 12 * 8)
50#define STK_OFF		(STK_SPACE_ADD - STK_160_UNUSED)
 
 
 
51
52#define STK_OFF_R6	(160 - 11 * 8)	/* Offset of r6 on stack */
53#define STK_OFF_TCCNT	(160 - 12 * 8)	/* Offset of tail_call_cnt on stack */
 
 
 
54
55#endif /* __ARCH_S390_NET_BPF_JIT_H */

 
 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 *	      +---------------+     |
32 *	      | 4 byte align  |     |
33 *	      | tail_call_cnt |     |
34 * BFP	   -> +===============+     |
35 *	      |		      |     |
36 *	      |   BPF stack   |     |
37 *	      |		      |     |
38 *	      +---------------+     |
39 *	      | 8 byte skbp   |     |
40 * R15+170 -> +---------------+     |
41 *	      | 8 byte hlen   |     |
42 * R15+168 -> +---------------+     |
43 *	      | 4 byte align  |     |
44 *	      +---------------+     |
45 *	      | 4 byte temp   |     |
46 *	      | for bpf_jit.S |     |
47 * R15+160 -> +---------------+     |
48 *	      | new backchain |     |
49 * R15+152 -> +---------------+     |
50 *	      | + 152 byte SA |     |
51 * R15	   -> +---------------+     + low
52 *
53 * We get 160 bytes stack space from calling function, but only use
54 * 12 * 8 byte for old backchain, r15..r6, and tail_call_cnt.
 
 
 
55 */
56#define STK_SPACE	(MAX_BPF_STACK + 8 + 8 + 4 + 4 + 160)
57#define STK_160_UNUSED	(160 - 12 * 8)
58#define STK_OFF		(STK_SPACE - STK_160_UNUSED)
59#define STK_OFF_TMP	160	/* Offset of tmp buffer on stack */
60#define STK_OFF_HLEN	168	/* Offset of SKB header length on stack */
61#define STK_OFF_SKBP	170	/* Offset of SKB pointer on stack */
62
63#define STK_OFF_R6	(160 - 11 * 8)	/* Offset of r6 on stack */
64#define STK_OFF_TCCNT	(160 - 12 * 8)	/* Offset of tail_call_cnt on stack */
65
66/* Offset to skip condition code check */
67#define OFF_OK		4
68
69#endif /* __ARCH_S390_NET_BPF_JIT_H */