cachepc-linux

Fork of AMDESE/linux with modifications for CachePC side-channel attack
git clone https://git.sinitax.com/sinitax/cachepc-linux
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bpf_jit.h (1526B)

      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 */