/* SPDX-License-Identifier: GPL-2.0 */ /* * BPF Jit compiler defines * * Copyright IBM Corp. 2012,2015 * * Author(s): Martin Schwidefsky <schwidefsky@de.ibm.com> * Michael Holzheu <holzheu@linux.vnet.ibm.com> */ #ifndef __ARCH_S390_NET_BPF_JIT_H #define __ARCH_S390_NET_BPF_JIT_H #ifndef __ASSEMBLY__ #include <linux/filter.h> #include <linux/types.h> #endif /* __ASSEMBLY__ */ /* * Stackframe layout (packed stack): * * ^ high * +---------------+ | * | old backchain | | * +---------------+ | * | r15 - r6 | | * +---------------+ | * | 4 byte align | | * | tail_call_cnt | | * BFP -> +===============+ | * | | | * | BPF stack | | * | | | * R15+160 -> +---------------+ | * | new backchain | | * R15+152 -> +---------------+ | * | + 152 byte SA | | * R15 -> +---------------+ + low * * We get 160 bytes stack space from calling function, but only use * 12 * 8 byte for old backchain, r15..r6, and tail_call_cnt. * * The stack size used by the BPF program ("BPF stack" above) is passed * via "aux->stack_depth". */ #define STK_SPACE_ADD (160) #define STK_160_UNUSED (160 - 12 * 8) #define STK_OFF (STK_SPACE_ADD - STK_160_UNUSED) #define STK_OFF_R6 (160 - 11 * 8) /* Offset of r6 on stack */ #define STK_OFF_TCCNT (160 - 12 * 8) /* Offset of tail_call_cnt on stack */ #endif /* __ARCH_S390_NET_BPF_JIT_H */