162306a36Sopenharmony_ci/* SPDX-License-Identifier: GPL-2.0 */
262306a36Sopenharmony_ci/*
362306a36Sopenharmony_ci * BPF Jit compiler defines
462306a36Sopenharmony_ci *
562306a36Sopenharmony_ci * Copyright IBM Corp. 2012,2015
662306a36Sopenharmony_ci *
762306a36Sopenharmony_ci * Author(s): Martin Schwidefsky <schwidefsky@de.ibm.com>
862306a36Sopenharmony_ci *	      Michael Holzheu <holzheu@linux.vnet.ibm.com>
962306a36Sopenharmony_ci */
1062306a36Sopenharmony_ci
1162306a36Sopenharmony_ci#ifndef __ARCH_S390_NET_BPF_JIT_H
1262306a36Sopenharmony_ci#define __ARCH_S390_NET_BPF_JIT_H
1362306a36Sopenharmony_ci
1462306a36Sopenharmony_ci#ifndef __ASSEMBLY__
1562306a36Sopenharmony_ci
1662306a36Sopenharmony_ci#include <linux/filter.h>
1762306a36Sopenharmony_ci#include <linux/types.h>
1862306a36Sopenharmony_ci
1962306a36Sopenharmony_ci#endif /* __ASSEMBLY__ */
2062306a36Sopenharmony_ci
2162306a36Sopenharmony_ci/*
2262306a36Sopenharmony_ci * Stackframe layout (packed stack):
2362306a36Sopenharmony_ci *
2462306a36Sopenharmony_ci *				    ^ high
2562306a36Sopenharmony_ci *	      +---------------+     |
2662306a36Sopenharmony_ci *	      | old backchain |     |
2762306a36Sopenharmony_ci *	      +---------------+     |
2862306a36Sopenharmony_ci *	      |   r15 - r6    |     |
2962306a36Sopenharmony_ci *	      +---------------+     |
3062306a36Sopenharmony_ci *	      | 4 byte align  |     |
3162306a36Sopenharmony_ci *	      | tail_call_cnt |     |
3262306a36Sopenharmony_ci * BFP	   -> +===============+     |
3362306a36Sopenharmony_ci *	      |		      |     |
3462306a36Sopenharmony_ci *	      |   BPF stack   |     |
3562306a36Sopenharmony_ci *	      |		      |     |
3662306a36Sopenharmony_ci * R15+160 -> +---------------+     |
3762306a36Sopenharmony_ci *	      | new backchain |     |
3862306a36Sopenharmony_ci * R15+152 -> +---------------+     |
3962306a36Sopenharmony_ci *	      | + 152 byte SA |     |
4062306a36Sopenharmony_ci * R15	   -> +---------------+     + low
4162306a36Sopenharmony_ci *
4262306a36Sopenharmony_ci * We get 160 bytes stack space from calling function, but only use
4362306a36Sopenharmony_ci * 12 * 8 byte for old backchain, r15..r6, and tail_call_cnt.
4462306a36Sopenharmony_ci *
4562306a36Sopenharmony_ci * The stack size used by the BPF program ("BPF stack" above) is passed
4662306a36Sopenharmony_ci * via "aux->stack_depth".
4762306a36Sopenharmony_ci */
4862306a36Sopenharmony_ci#define STK_SPACE_ADD	(160)
4962306a36Sopenharmony_ci#define STK_160_UNUSED	(160 - 12 * 8)
5062306a36Sopenharmony_ci#define STK_OFF		(STK_SPACE_ADD - STK_160_UNUSED)
5162306a36Sopenharmony_ci
5262306a36Sopenharmony_ci#define STK_OFF_R6	(160 - 11 * 8)	/* Offset of r6 on stack */
5362306a36Sopenharmony_ci#define STK_OFF_TCCNT	(160 - 12 * 8)	/* Offset of tail_call_cnt on stack */
5462306a36Sopenharmony_ci
5562306a36Sopenharmony_ci#endif /* __ARCH_S390_NET_BPF_JIT_H */
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