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 * +---------------+ | 32 * | 4 byte align | | 33 * | tail_call_cnt | | 34 * BFP -> +===============+ | 35 * | | | 36 * | BPF stack | | 37 * | | | 38 * +---------------+ | 39 * | 8 byte skbp | | 40 * R15+176 -> +---------------+ | 41 * | 8 byte hlen | | 42 * R15+168 -> +---------------+ | 43 * | 4 byte align | | 44 * +---------------+ | 45 * | 4 byte temp | | 46 * | for bpf_jit.S | | 47 * R15+160 -> +---------------+ | 48 * | new backchain | | 49 * R15+152 -> +---------------+ | 50 * | + 152 byte SA | | 51 * R15 -> +---------------+ + low 52 * 53 * We get 160 bytes stack space from calling function, but only use 54 * 12 * 8 byte for old backchain, r15..r6, and tail_call_cnt. 55 */ 56 #define STK_SPACE (MAX_BPF_STACK + 8 + 8 + 4 + 4 + 160) 57 #define STK_160_UNUSED (160 - 12 * 8) 58 #define STK_OFF (STK_SPACE - STK_160_UNUSED) 59 #define STK_OFF_TMP 160 /* Offset of tmp buffer on stack */ 60 #define STK_OFF_HLEN 168 /* Offset of SKB header length on stack */ 61 #define STK_OFF_SKBP 176 /* Offset of SKB pointer on stack */ 62 63 #define STK_OFF_R6 (160 - 11 * 8) /* Offset of r6 on stack */ 64 #define STK_OFF_TCCNT (160 - 12 * 8) /* Offset of tail_call_cnt on stack */ 65 66 /* Offset to skip condition code check */ 67 #define OFF_OK 4 68 69 #endif /* __ARCH_S390_NET_BPF_JIT_H */ 70