85 lines
2.2 KiB
C
85 lines
2.2 KiB
C
/*
|
|
* Just-In-Time compiler for BPF filters on MIPS
|
|
*
|
|
* Copyright (c) 2014 Imagination Technologies Ltd.
|
|
* Author: Markos Chandras <markos.chandras@imgtec.com>
|
|
*
|
|
* This program is free software; you can redistribute it and/or modify it
|
|
* under the terms of the GNU General Public License as published by the
|
|
* Free Software Foundation; version 2 of the License.
|
|
*/
|
|
|
|
#ifndef BPF_JIT_MIPS_OP_H
|
|
#define BPF_JIT_MIPS_OP_H
|
|
|
|
/* Registers used by JIT */
|
|
#define MIPS_R_ZERO 0
|
|
#define MIPS_R_V0 2
|
|
#define MIPS_R_A0 4
|
|
#define MIPS_R_A1 5
|
|
#define MIPS_R_T4 12
|
|
#define MIPS_R_T5 13
|
|
#define MIPS_R_T6 14
|
|
#define MIPS_R_T7 15
|
|
#define MIPS_R_S0 16
|
|
#define MIPS_R_S1 17
|
|
#define MIPS_R_S2 18
|
|
#define MIPS_R_S3 19
|
|
#define MIPS_R_S4 20
|
|
#define MIPS_R_S5 21
|
|
#define MIPS_R_S6 22
|
|
#define MIPS_R_S7 23
|
|
#define MIPS_R_SP 29
|
|
#define MIPS_R_RA 31
|
|
|
|
/* Conditional codes */
|
|
#define MIPS_COND_EQ 0x1
|
|
#define MIPS_COND_GE (0x1 << 1)
|
|
#define MIPS_COND_GT (0x1 << 2)
|
|
#define MIPS_COND_NE (0x1 << 3)
|
|
#define MIPS_COND_ALL (0x1 << 4)
|
|
/* Conditionals on X register or K immediate */
|
|
#define MIPS_COND_X (0x1 << 5)
|
|
#define MIPS_COND_K (0x1 << 6)
|
|
|
|
#define r_ret MIPS_R_V0
|
|
|
|
/*
|
|
* Use 2 scratch registers to avoid pipeline interlocks.
|
|
* There is no overhead during epilogue and prologue since
|
|
* any of the $s0-$s6 registers will only be preserved if
|
|
* they are going to actually be used.
|
|
*/
|
|
#define r_skb_hl MIPS_R_S0 /* skb header length */
|
|
#define r_skb_data MIPS_R_S1 /* skb actual data */
|
|
#define r_off MIPS_R_S2
|
|
#define r_A MIPS_R_S3
|
|
#define r_X MIPS_R_S4
|
|
#define r_skb MIPS_R_S5
|
|
#define r_M MIPS_R_S6
|
|
#define r_skb_len MIPS_R_S7
|
|
#define r_s0 MIPS_R_T4 /* scratch reg 1 */
|
|
#define r_s1 MIPS_R_T5 /* scratch reg 2 */
|
|
#define r_tmp_imm MIPS_R_T6 /* No need to preserve this */
|
|
#define r_tmp MIPS_R_T7 /* No need to preserve this */
|
|
#define r_zero MIPS_R_ZERO
|
|
#define r_sp MIPS_R_SP
|
|
#define r_ra MIPS_R_RA
|
|
|
|
#ifndef __ASSEMBLY__
|
|
|
|
/* Declare ASM helpers */
|
|
|
|
#define DECLARE_LOAD_FUNC(func) \
|
|
extern u8 func(unsigned long *skb, int offset); \
|
|
extern u8 func##_negative(unsigned long *skb, int offset); \
|
|
extern u8 func##_positive(unsigned long *skb, int offset)
|
|
|
|
DECLARE_LOAD_FUNC(sk_load_word);
|
|
DECLARE_LOAD_FUNC(sk_load_half);
|
|
DECLARE_LOAD_FUNC(sk_load_byte);
|
|
|
|
#endif
|
|
|
|
#endif /* BPF_JIT_MIPS_OP_H */
|