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 */ 56