1b2441318SGreg Kroah-Hartman /* SPDX-License-Identifier: GPL-2.0 */ 205462310SMichael Holzheu /* 305462310SMichael Holzheu * BPF Jit compiler defines 405462310SMichael Holzheu * 505462310SMichael Holzheu * Copyright IBM Corp. 2012,2015 605462310SMichael Holzheu * 705462310SMichael Holzheu * Author(s): Martin Schwidefsky <schwidefsky@de.ibm.com> 805462310SMichael Holzheu * Michael Holzheu <holzheu@linux.vnet.ibm.com> 905462310SMichael Holzheu */ 1005462310SMichael Holzheu 1105462310SMichael Holzheu #ifndef __ARCH_S390_NET_BPF_JIT_H 1205462310SMichael Holzheu #define __ARCH_S390_NET_BPF_JIT_H 1305462310SMichael Holzheu 1405462310SMichael Holzheu #ifndef __ASSEMBLY__ 1505462310SMichael Holzheu 1605462310SMichael Holzheu #include <linux/filter.h> 1705462310SMichael Holzheu #include <linux/types.h> 1805462310SMichael Holzheu 1905462310SMichael Holzheu #endif /* __ASSEMBLY__ */ 2005462310SMichael Holzheu 2105462310SMichael Holzheu /* 2205462310SMichael Holzheu * Stackframe layout (packed stack): 2305462310SMichael Holzheu * 2405462310SMichael Holzheu * ^ high 2505462310SMichael Holzheu * +---------------+ | 2605462310SMichael Holzheu * | old backchain | | 2705462310SMichael Holzheu * +---------------+ | 2805462310SMichael Holzheu * | r15 - r6 | | 296651ee07SMichael Holzheu * +---------------+ | 306651ee07SMichael Holzheu * | 4 byte align | | 316651ee07SMichael Holzheu * | tail_call_cnt | | 3205462310SMichael Holzheu * BFP -> +===============+ | 3305462310SMichael Holzheu * | | | 3405462310SMichael Holzheu * | BPF stack | | 3505462310SMichael Holzheu * | | | 3605462310SMichael Holzheu * R15+160 -> +---------------+ | 3705462310SMichael Holzheu * | new backchain | | 3805462310SMichael Holzheu * R15+152 -> +---------------+ | 3905462310SMichael Holzheu * | + 152 byte SA | | 4005462310SMichael Holzheu * R15 -> +---------------+ + low 4105462310SMichael Holzheu * 4205462310SMichael Holzheu * We get 160 bytes stack space from calling function, but only use 436651ee07SMichael Holzheu * 12 * 8 byte for old backchain, r15..r6, and tail_call_cnt. 4478372709SMichael Holzheu * 4578372709SMichael Holzheu * The stack size used by the BPF program ("BPF stack" above) is passed 4678372709SMichael Holzheu * via "aux->stack_depth". 4705462310SMichael Holzheu */ 48e1cf4befSDaniel Borkmann #define STK_SPACE_ADD (160) 496651ee07SMichael Holzheu #define STK_160_UNUSED (160 - 12 * 8) 5078372709SMichael Holzheu #define STK_OFF (STK_SPACE_ADD - STK_160_UNUSED) 5105462310SMichael Holzheu 526651ee07SMichael Holzheu #define STK_OFF_R6 (160 - 11 * 8) /* Offset of r6 on stack */ 536651ee07SMichael Holzheu #define STK_OFF_TCCNT (160 - 12 * 8) /* Offset of tail_call_cnt on stack */ 546651ee07SMichael Holzheu 5505462310SMichael Holzheu #endif /* __ARCH_S390_NET_BPF_JIT_H */ 56