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81 lines
2.1 KiB
81 lines
2.1 KiB
/* SPDX-License-Identifier: GPL-2.0-only */ |
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/* |
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* Just-In-Time compiler for BPF filters on MIPS |
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* |
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* Copyright (c) 2014 Imagination Technologies Ltd. |
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* Author: Markos Chandras <[email protected]> |
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*/ |
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#ifndef BPF_JIT_MIPS_OP_H |
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#define BPF_JIT_MIPS_OP_H |
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/* Registers used by JIT */ |
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#define MIPS_R_ZERO 0 |
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#define MIPS_R_V0 2 |
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#define MIPS_R_A0 4 |
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#define MIPS_R_A1 5 |
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#define MIPS_R_T4 12 |
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#define MIPS_R_T5 13 |
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#define MIPS_R_T6 14 |
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#define MIPS_R_T7 15 |
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#define MIPS_R_S0 16 |
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#define MIPS_R_S1 17 |
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#define MIPS_R_S2 18 |
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#define MIPS_R_S3 19 |
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#define MIPS_R_S4 20 |
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#define MIPS_R_S5 21 |
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#define MIPS_R_S6 22 |
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#define MIPS_R_S7 23 |
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#define MIPS_R_SP 29 |
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#define MIPS_R_RA 31 |
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/* Conditional codes */ |
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#define MIPS_COND_EQ 0x1 |
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#define MIPS_COND_GE (0x1 << 1) |
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#define MIPS_COND_GT (0x1 << 2) |
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#define MIPS_COND_NE (0x1 << 3) |
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#define MIPS_COND_ALL (0x1 << 4) |
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/* Conditionals on X register or K immediate */ |
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#define MIPS_COND_X (0x1 << 5) |
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#define MIPS_COND_K (0x1 << 6) |
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#define r_ret MIPS_R_V0 |
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/* |
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* Use 2 scratch registers to avoid pipeline interlocks. |
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* There is no overhead during epilogue and prologue since |
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* any of the $s0-$s6 registers will only be preserved if |
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* they are going to actually be used. |
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*/ |
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#define r_skb_hl MIPS_R_S0 /* skb header length */ |
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#define r_skb_data MIPS_R_S1 /* skb actual data */ |
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#define r_off MIPS_R_S2 |
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#define r_A MIPS_R_S3 |
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#define r_X MIPS_R_S4 |
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#define r_skb MIPS_R_S5 |
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#define r_M MIPS_R_S6 |
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#define r_skb_len MIPS_R_S7 |
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#define r_s0 MIPS_R_T4 /* scratch reg 1 */ |
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#define r_s1 MIPS_R_T5 /* scratch reg 2 */ |
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#define r_tmp_imm MIPS_R_T6 /* No need to preserve this */ |
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#define r_tmp MIPS_R_T7 /* No need to preserve this */ |
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#define r_zero MIPS_R_ZERO |
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#define r_sp MIPS_R_SP |
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#define r_ra MIPS_R_RA |
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#ifndef __ASSEMBLY__ |
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/* Declare ASM helpers */ |
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#define DECLARE_LOAD_FUNC(func) \ |
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extern u8 func(unsigned long *skb, int offset); \ |
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extern u8 func##_negative(unsigned long *skb, int offset); \ |
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extern u8 func##_positive(unsigned long *skb, int offset) |
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DECLARE_LOAD_FUNC(sk_load_word); |
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DECLARE_LOAD_FUNC(sk_load_half); |
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DECLARE_LOAD_FUNC(sk_load_byte); |
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#endif |
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#endif /* BPF_JIT_MIPS_OP_H */
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