/*
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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 <markos.chandras@imgtec.com>
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*
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* This program is free software; you can redistribute it and/or modify it
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* under the terms of the GNU General Public License as published by the
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* Free Software Foundation; version 2 of the License.
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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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