18c2ecf20Sopenharmony_ci/* SPDX-License-Identifier: GPL-2.0 */
28c2ecf20Sopenharmony_ci/*
38c2ecf20Sopenharmony_ci * BPF Jit compiler defines
48c2ecf20Sopenharmony_ci *
58c2ecf20Sopenharmony_ci * Copyright IBM Corp. 2012,2015
68c2ecf20Sopenharmony_ci *
78c2ecf20Sopenharmony_ci * Author(s): Martin Schwidefsky <schwidefsky@de.ibm.com>
88c2ecf20Sopenharmony_ci *	      Michael Holzheu <holzheu@linux.vnet.ibm.com>
98c2ecf20Sopenharmony_ci */
108c2ecf20Sopenharmony_ci
118c2ecf20Sopenharmony_ci#ifndef __ARCH_S390_NET_BPF_JIT_H
128c2ecf20Sopenharmony_ci#define __ARCH_S390_NET_BPF_JIT_H
138c2ecf20Sopenharmony_ci
148c2ecf20Sopenharmony_ci#ifndef __ASSEMBLY__
158c2ecf20Sopenharmony_ci
168c2ecf20Sopenharmony_ci#include <linux/filter.h>
178c2ecf20Sopenharmony_ci#include <linux/types.h>
188c2ecf20Sopenharmony_ci
198c2ecf20Sopenharmony_ci#endif /* __ASSEMBLY__ */
208c2ecf20Sopenharmony_ci
218c2ecf20Sopenharmony_ci/*
228c2ecf20Sopenharmony_ci * Stackframe layout (packed stack):
238c2ecf20Sopenharmony_ci *
248c2ecf20Sopenharmony_ci *				    ^ high
258c2ecf20Sopenharmony_ci *	      +---------------+     |
268c2ecf20Sopenharmony_ci *	      | old backchain |     |
278c2ecf20Sopenharmony_ci *	      +---------------+     |
288c2ecf20Sopenharmony_ci *	      |   r15 - r6    |     |
298c2ecf20Sopenharmony_ci *	      +---------------+     |
308c2ecf20Sopenharmony_ci *	      | 4 byte align  |     |
318c2ecf20Sopenharmony_ci *	      | tail_call_cnt |     |
328c2ecf20Sopenharmony_ci * BFP	   -> +===============+     |
338c2ecf20Sopenharmony_ci *	      |		      |     |
348c2ecf20Sopenharmony_ci *	      |   BPF stack   |     |
358c2ecf20Sopenharmony_ci *	      |		      |     |
368c2ecf20Sopenharmony_ci * R15+160 -> +---------------+     |
378c2ecf20Sopenharmony_ci *	      | new backchain |     |
388c2ecf20Sopenharmony_ci * R15+152 -> +---------------+     |
398c2ecf20Sopenharmony_ci *	      | + 152 byte SA |     |
408c2ecf20Sopenharmony_ci * R15	   -> +---------------+     + low
418c2ecf20Sopenharmony_ci *
428c2ecf20Sopenharmony_ci * We get 160 bytes stack space from calling function, but only use
438c2ecf20Sopenharmony_ci * 12 * 8 byte for old backchain, r15..r6, and tail_call_cnt.
448c2ecf20Sopenharmony_ci *
458c2ecf20Sopenharmony_ci * The stack size used by the BPF program ("BPF stack" above) is passed
468c2ecf20Sopenharmony_ci * via "aux->stack_depth".
478c2ecf20Sopenharmony_ci */
488c2ecf20Sopenharmony_ci#define STK_SPACE_ADD	(160)
498c2ecf20Sopenharmony_ci#define STK_160_UNUSED	(160 - 12 * 8)
508c2ecf20Sopenharmony_ci#define STK_OFF		(STK_SPACE_ADD - STK_160_UNUSED)
518c2ecf20Sopenharmony_ci
528c2ecf20Sopenharmony_ci#define STK_OFF_R6	(160 - 11 * 8)	/* Offset of r6 on stack */
538c2ecf20Sopenharmony_ci#define STK_OFF_TCCNT	(160 - 12 * 8)	/* Offset of tail_call_cnt on stack */
548c2ecf20Sopenharmony_ci
558c2ecf20Sopenharmony_ci#endif /* __ARCH_S390_NET_BPF_JIT_H */
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