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- /*
- * 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>
- extern u8 sk_load_word_pos[], sk_load_half_pos[], sk_load_byte_pos[];
- extern u8 sk_load_word[], sk_load_half[], sk_load_byte[];
- #endif /* __ASSEMBLY__ */
- /*
- * Stackframe layout (packed stack):
- *
- * ^ high
- * +---------------+ |
- * | old backchain | |
- * +---------------+ |
- * | r15 - r6 | |
- * +---------------+ |
- * | 4 byte align | |
- * | tail_call_cnt | |
- * BFP -> +===============+ |
- * | | |
- * | BPF stack | |
- * | | |
- * +---------------+ |
- * | 8 byte skbp | |
- * R15+176 -> +---------------+ |
- * | 8 byte hlen | |
- * R15+168 -> +---------------+ |
- * | 4 byte align | |
- * +---------------+ |
- * | 4 byte temp | |
- * | for bpf_jit.S | |
- * 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.
- */
- #define STK_SPACE (MAX_BPF_STACK + 8 + 8 + 4 + 4 + 160)
- #define STK_160_UNUSED (160 - 12 * 8)
- #define STK_OFF (STK_SPACE - STK_160_UNUSED)
- #define STK_OFF_TMP 160 /* Offset of tmp buffer on stack */
- #define STK_OFF_HLEN 168 /* Offset of SKB header length on stack */
- #define STK_OFF_SKBP 176 /* Offset of SKB pointer on stack */
- #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 */
- /* Offset to skip condition code check */
- #define OFF_OK 4
- #endif /* __ARCH_S390_NET_BPF_JIT_H */
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