67 lines
1.9 KiB
C
67 lines
1.9 KiB
C
/*
|
|
* 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 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 + 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_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 */
|