projects / deliverable / linux.git / blame
| Commit | Line | Data |
|---|---|---|
| c6610de3 MC |
1 | /* |
| 2 | * Just-In-Time compiler for BPF filters on MIPS | |
| 3 | * | |
| 4 | * Copyright (c) 2014 Imagination Technologies Ltd. | |
| 5 | * Author: Markos Chandras <markos.chandras@imgtec.com> | |
| 6 | * | |
| 7 | * This program is free software; you can redistribute it and/or modify it | |
| 8 | * under the terms of the GNU General Public License as published by the | |
| 9 | * Free Software Foundation; version 2 of the License. | |
| 10 | */ | |
| 11 | ||
| 12 | #ifndef BPF_JIT_MIPS_OP_H | |
| 13 | #define BPF_JIT_MIPS_OP_H | |
| 14 | ||
| 15 | /* Registers used by JIT */ | |
| 16 | #define MIPS_R_ZERO 0 | |
| 17 | #define MIPS_R_V0 2 | |
| c6610de3 MC |
18 | #define MIPS_R_A0 4 |
| 19 | #define MIPS_R_A1 5 | |
| ad152bd6 MC |
20 | #define MIPS_R_T4 12 |
| 21 | #define MIPS_R_T5 13 | |
| c6610de3 MC |
22 | #define MIPS_R_T6 14 |
| 23 | #define MIPS_R_T7 15 | |
| 24 | #define MIPS_R_S0 16 | |
| 25 | #define MIPS_R_S1 17 | |
| 26 | #define MIPS_R_S2 18 | |
| 27 | #define MIPS_R_S3 19 | |
| 28 | #define MIPS_R_S4 20 | |
| 29 | #define MIPS_R_S5 21 | |
| 30 | #define MIPS_R_S6 22 | |
| 31 | #define MIPS_R_S7 23 | |
| 32 | #define MIPS_R_SP 29 | |
| 33 | #define MIPS_R_RA 31 | |
| 34 | ||
| 35 | /* Conditional codes */ | |
| 36 | #define MIPS_COND_EQ 0x1 | |
| 37 | #define MIPS_COND_GE (0x1 << 1) | |
| 38 | #define MIPS_COND_GT (0x1 << 2) | |
| 39 | #define MIPS_COND_NE (0x1 << 3) | |
| 40 | #define MIPS_COND_ALL (0x1 << 4) | |
| 41 | /* Conditionals on X register or K immediate */ | |
| 42 | #define MIPS_COND_X (0x1 << 5) | |
| 43 | #define MIPS_COND_K (0x1 << 6) | |
| 44 | ||
| 79a8855c MC |
45 | #define r_ret MIPS_R_V0 |
| 46 | ||
| 47 | /* | |
| 48 | * Use 2 scratch registers to avoid pipeline interlocks. | |
| 49 | * There is no overhead during epilogue and prologue since | |
| 50 | * any of the $s0-$s6 registers will only be preserved if | |
| 51 | * they are going to actually be used. | |
| 52 | */ | |
| 266a88e2 MC |
53 | #define r_skb_hl MIPS_R_S0 /* skb header length */ |
| 54 | #define r_skb_data MIPS_R_S1 /* skb actual data */ | |
| 79a8855c MC |
55 | #define r_off MIPS_R_S2 |
| 56 | #define r_A MIPS_R_S3 | |
| 57 | #define r_X MIPS_R_S4 | |
| 58 | #define r_skb MIPS_R_S5 | |
| 59 | #define r_M MIPS_R_S6 | |
| 266a88e2 | 60 | #define r_skb_len MIPS_R_S7 |
| 79a8855c MC |
61 | #define r_s0 MIPS_R_T4 /* scratch reg 1 */ |
| 62 | #define r_s1 MIPS_R_T5 /* scratch reg 2 */ | |
| 63 | #define r_tmp_imm MIPS_R_T6 /* No need to preserve this */ | |
| 64 | #define r_tmp MIPS_R_T7 /* No need to preserve this */ | |
| 65 | #define r_zero MIPS_R_ZERO | |
| 66 | #define r_sp MIPS_R_SP | |
| 67 | #define r_ra MIPS_R_RA | |
| 68 | ||
| 266a88e2 MC |
69 | #ifndef __ASSEMBLY__ |
| 70 | ||
| 71 | /* Declare ASM helpers */ | |
| 72 | ||
| 73 | #define DECLARE_LOAD_FUNC(func) \ | |
| 74 | extern u8 func(unsigned long *skb, int offset); \ | |
| 75 | extern u8 func##_negative(unsigned long *skb, int offset); \ | |
| 76 | extern u8 func##_positive(unsigned long *skb, int offset) | |
| 77 | ||
| 78 | DECLARE_LOAD_FUNC(sk_load_word); | |
| 79 | DECLARE_LOAD_FUNC(sk_load_half); | |
| 80 | DECLARE_LOAD_FUNC(sk_load_byte); | |
| 81 | ||
| 82 | #endif | |
| 83 | ||
| c6610de3 | 84 | #endif /* BPF_JIT_MIPS_OP_H */ |