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- /*
- * 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 */
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