/* * 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 */Overall Contributors
| Person | Tokens | Prop | Commits | CommitProp |
| Markos Chandras | 213 | 100.00% | 4 | 100.00% |
| Total | 213 | 100.00% | 4 | 100.00% |