| /* |
| * 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 */ |
