1 /* 2 * BPF Jit compiler defines 3 * 4 * Copyright IBM Corp. 2012,2015 5 * 6 * Author(s): Martin Schwidefsky <schwidefsky@de.ibm.com> 7 * Michael Holzheu <holzheu@linux.vnet.ibm.com> 8 */ 9 10 #ifndef __ARCH_S390_NET_BPF_JIT_H 11 #define __ARCH_S390_NET_BPF_JIT_H 12 13 #ifndef __ASSEMBLY__ 14 15 #include <linux/filter.h> 16 #include <linux/types.h> 17 18 extern u8 sk_load_word_pos[], sk_load_half_pos[], sk_load_byte_pos[]; 19 extern u8 sk_load_word[], sk_load_half[], sk_load_byte[]; 20 21 #endif /* __ASSEMBLY__ */ 22 23 /* 24 * Stackframe layout (packed stack): 25 * 26 * ^ high 27 * +---------------+ | 28 * | old backchain | | 29 * +---------------+ | 30 * | r15 - r6 | | 31 * BFP -> +===============+ | 32 * | | | 33 * | BPF stack | | 34 * | | | 35 * +---------------+ | 36 * | 8 byte hlen | | 37 * R15+168 -> +---------------+ | 38 * | 4 byte align | | 39 * +---------------+ | 40 * | 4 byte temp | | 41 * | for bpf_jit.S | | 42 * R15+160 -> +---------------+ | 43 * | new backchain | | 44 * R15+152 -> +---------------+ | 45 * | + 152 byte SA | | 46 * R15 -> +---------------+ + low 47 * 48 * We get 160 bytes stack space from calling function, but only use 49 * 11 * 8 byte (old backchain + r15 - r6) for storing registers. 50 */ 51 #define STK_SPACE (MAX_BPF_STACK + 8 + 4 + 4 + 160) 52 #define STK_160_UNUSED (160 - 11 * 8) 53 #define STK_OFF (STK_SPACE - STK_160_UNUSED) 54 #define STK_OFF_TMP 160 /* Offset of tmp buffer on stack */ 55 #define STK_OFF_HLEN 168 /* Offset of SKB header length on stack */ 56 57 /* Offset to skip condition code check */ 58 #define OFF_OK 4 59 60 #endif /* __ARCH_S390_NET_BPF_JIT_H */ 61