2 * BPF Jit compiler defines
4 * Copyright IBM Corp. 2012,2015
6 * Author(s): Martin Schwidefsky <schwidefsky@de.ibm.com>
7 * Michael Holzheu <holzheu@linux.vnet.ibm.com>
10 #ifndef __ARCH_S390_NET_BPF_JIT_H
11 #define __ARCH_S390_NET_BPF_JIT_H
15 #include <linux/filter.h>
16 #include <linux/types.h>
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[];
21 #endif /* __ASSEMBLY__ */
24 * Stackframe layout (packed stack):
31 * BFP -> +===============+ |
37 * R15+168 -> +---------------+ |
42 * R15+160 -> +---------------+ |
44 * R15+152 -> +---------------+ |
46 * R15 -> +---------------+ + low
48 * We get 160 bytes stack space from calling function, but only use
49 * 11 * 8 byte (old backchain + r15 - r6) for storing registers.
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 */
57 /* Offset to skip condition code check */
60 #endif /* __ARCH_S390_NET_BPF_JIT_H */