105462310SMichael Holzheu /* 205462310SMichael Holzheu * BPF Jit compiler defines 305462310SMichael Holzheu * 405462310SMichael Holzheu * Copyright IBM Corp. 2012,2015 505462310SMichael Holzheu * 605462310SMichael Holzheu * Author(s): Martin Schwidefsky <schwidefsky@de.ibm.com> 705462310SMichael Holzheu * Michael Holzheu <holzheu@linux.vnet.ibm.com> 805462310SMichael Holzheu */ 905462310SMichael Holzheu 1005462310SMichael Holzheu #ifndef __ARCH_S390_NET_BPF_JIT_H 1105462310SMichael Holzheu #define __ARCH_S390_NET_BPF_JIT_H 1205462310SMichael Holzheu 1305462310SMichael Holzheu #ifndef __ASSEMBLY__ 1405462310SMichael Holzheu 1505462310SMichael Holzheu #include <linux/filter.h> 1605462310SMichael Holzheu #include <linux/types.h> 1705462310SMichael Holzheu 1805462310SMichael Holzheu extern u8 sk_load_word_pos[], sk_load_half_pos[], sk_load_byte_pos[]; 1905462310SMichael Holzheu extern u8 sk_load_word[], sk_load_half[], sk_load_byte[]; 2005462310SMichael Holzheu 2105462310SMichael Holzheu #endif /* __ASSEMBLY__ */ 2205462310SMichael Holzheu 2305462310SMichael Holzheu /* 2405462310SMichael Holzheu * Stackframe layout (packed stack): 2505462310SMichael Holzheu * 2605462310SMichael Holzheu * ^ high 2705462310SMichael Holzheu * +---------------+ | 2805462310SMichael Holzheu * | old backchain | | 2905462310SMichael Holzheu * +---------------+ | 3005462310SMichael Holzheu * | r15 - r6 | | 316651ee07SMichael Holzheu * +---------------+ | 326651ee07SMichael Holzheu * | 4 byte align | | 336651ee07SMichael Holzheu * | tail_call_cnt | | 3405462310SMichael Holzheu * BFP -> +===============+ | 3505462310SMichael Holzheu * | | | 3605462310SMichael Holzheu * | BPF stack | | 3705462310SMichael Holzheu * | | | 3805462310SMichael Holzheu * +---------------+ | 3905462310SMichael Holzheu * | 8 byte hlen | | 4005462310SMichael Holzheu * R15+168 -> +---------------+ | 4105462310SMichael Holzheu * | 4 byte align | | 4205462310SMichael Holzheu * +---------------+ | 4305462310SMichael Holzheu * | 4 byte temp | | 4405462310SMichael Holzheu * | for bpf_jit.S | | 4505462310SMichael Holzheu * R15+160 -> +---------------+ | 4605462310SMichael Holzheu * | new backchain | | 4705462310SMichael Holzheu * R15+152 -> +---------------+ | 4805462310SMichael Holzheu * | + 152 byte SA | | 4905462310SMichael Holzheu * R15 -> +---------------+ + low 5005462310SMichael Holzheu * 5105462310SMichael Holzheu * We get 160 bytes stack space from calling function, but only use 526651ee07SMichael Holzheu * 12 * 8 byte for old backchain, r15..r6, and tail_call_cnt. 5305462310SMichael Holzheu */ 54bbac1c94SMichael Holzheu #define STK_SPACE (MAX_BPF_STACK + 8 + 4 + 4 + 160) 556651ee07SMichael Holzheu #define STK_160_UNUSED (160 - 12 * 8) 56bbac1c94SMichael Holzheu #define STK_OFF (STK_SPACE - STK_160_UNUSED) 5705462310SMichael Holzheu #define STK_OFF_TMP 160 /* Offset of tmp buffer on stack */ 5805462310SMichael Holzheu #define STK_OFF_HLEN 168 /* Offset of SKB header length on stack */ 5905462310SMichael Holzheu 606651ee07SMichael Holzheu #define STK_OFF_R6 (160 - 11 * 8) /* Offset of r6 on stack */ 616651ee07SMichael Holzheu #define STK_OFF_TCCNT (160 - 12 * 8) /* Offset of tail_call_cnt on stack */ 626651ee07SMichael Holzheu 6305462310SMichael Holzheu /* Offset to skip condition code check */ 6405462310SMichael Holzheu #define OFF_OK 4 6505462310SMichael Holzheu 6605462310SMichael Holzheu #endif /* __ARCH_S390_NET_BPF_JIT_H */ 67