1 /* SPDX-License-Identifier: GPL-2.0-only */ 2 /* 3 * Just-In-Time compiler for BPF filters on MIPS 4 * 5 * Copyright (c) 2014 Imagination Technologies Ltd. 6 * Author: Markos Chandras <markos.chandras@imgtec.com> 7 */ 8 9 #ifndef BPF_JIT_MIPS_OP_H 10 #define BPF_JIT_MIPS_OP_H 11 12 /* Registers used by JIT */ 13 #define MIPS_R_ZERO 0 14 #define MIPS_R_V0 2 15 #define MIPS_R_A0 4 16 #define MIPS_R_A1 5 17 #define MIPS_R_T4 12 18 #define MIPS_R_T5 13 19 #define MIPS_R_T6 14 20 #define MIPS_R_T7 15 21 #define MIPS_R_S0 16 22 #define MIPS_R_S1 17 23 #define MIPS_R_S2 18 24 #define MIPS_R_S3 19 25 #define MIPS_R_S4 20 26 #define MIPS_R_S5 21 27 #define MIPS_R_S6 22 28 #define MIPS_R_S7 23 29 #define MIPS_R_SP 29 30 #define MIPS_R_RA 31 31 32 /* Conditional codes */ 33 #define MIPS_COND_EQ 0x1 34 #define MIPS_COND_GE (0x1 << 1) 35 #define MIPS_COND_GT (0x1 << 2) 36 #define MIPS_COND_NE (0x1 << 3) 37 #define MIPS_COND_ALL (0x1 << 4) 38 /* Conditionals on X register or K immediate */ 39 #define MIPS_COND_X (0x1 << 5) 40 #define MIPS_COND_K (0x1 << 6) 41 42 #define r_ret MIPS_R_V0 43 44 /* 45 * Use 2 scratch registers to avoid pipeline interlocks. 46 * There is no overhead during epilogue and prologue since 47 * any of the $s0-$s6 registers will only be preserved if 48 * they are going to actually be used. 49 */ 50 #define r_skb_hl MIPS_R_S0 /* skb header length */ 51 #define r_skb_data MIPS_R_S1 /* skb actual data */ 52 #define r_off MIPS_R_S2 53 #define r_A MIPS_R_S3 54 #define r_X MIPS_R_S4 55 #define r_skb MIPS_R_S5 56 #define r_M MIPS_R_S6 57 #define r_skb_len MIPS_R_S7 58 #define r_s0 MIPS_R_T4 /* scratch reg 1 */ 59 #define r_s1 MIPS_R_T5 /* scratch reg 2 */ 60 #define r_tmp_imm MIPS_R_T6 /* No need to preserve this */ 61 #define r_tmp MIPS_R_T7 /* No need to preserve this */ 62 #define r_zero MIPS_R_ZERO 63 #define r_sp MIPS_R_SP 64 #define r_ra MIPS_R_RA 65 66 #ifndef __ASSEMBLY__ 67 68 /* Declare ASM helpers */ 69 70 #define DECLARE_LOAD_FUNC(func) \ 71 extern u8 func(unsigned long *skb, int offset); \ 72 extern u8 func##_negative(unsigned long *skb, int offset); \ 73 extern u8 func##_positive(unsigned long *skb, int offset) 74 75 DECLARE_LOAD_FUNC(sk_load_word); 76 DECLARE_LOAD_FUNC(sk_load_half); 77 DECLARE_LOAD_FUNC(sk_load_byte); 78 79 #endif 80 81 #endif /* BPF_JIT_MIPS_OP_H */ 82
