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):
34 * BFP -> +===============+ |
40 * R15+168 -> +---------------+ |
45 * R15+160 -> +---------------+ |
47 * R15+152 -> +---------------+ |
49 * R15 -> +---------------+ + low
51 * We get 160 bytes stack space from calling function, but only use
52 * 12 * 8 byte for old backchain, r15..r6, and tail_call_cnt.
54 #define STK_SPACE (MAX_BPF_STACK + 8 + 4 + 4 + 160)
55 #define STK_160_UNUSED (160 - 12 * 8)
56 #define STK_OFF (STK_SPACE - STK_160_UNUSED)
57 #define STK_OFF_TMP 160 /* Offset of tmp buffer on stack */
58 #define STK_OFF_HLEN 168 /* Offset of SKB header length on stack */
60 #define STK_OFF_R6 (160 - 11 * 8) /* Offset of r6 on stack */
61 #define STK_OFF_TCCNT (160 - 12 * 8) /* Offset of tail_call_cnt on stack */
63 /* Offset to skip condition code check */
66 #endif /* __ARCH_S390_NET_BPF_JIT_H */