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Diffstat (limited to 'arch/s390/net/bpf_jit.h')
| -rw-r--r-- | arch/s390/net/bpf_jit.h | 60 |
1 files changed, 60 insertions, 0 deletions
diff --git a/arch/s390/net/bpf_jit.h b/arch/s390/net/bpf_jit.h new file mode 100644 index 000000000..de156ba3b --- /dev/null +++ b/arch/s390/net/bpf_jit.h @@ -0,0 +1,60 @@ +/* + * 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 | | + * BFP -> +===============+ | + * | | | + * | BPF stack | | + * | | | + * +---------------+ | + * | 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 + * 11 * 8 byte (old backchain + r15 - r6) for storing registers. + */ +#define STK_SPACE (MAX_BPF_STACK + 8 + 4 + 4 + 160) +#define STK_160_UNUSED (160 - 11 * 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 */ + +/* Offset to skip condition code check */ +#define OFF_OK 4 + +#endif /* __ARCH_S390_NET_BPF_JIT_H */ |