mips, bpf: Remove old BPF JIT implementations

This patch removes the old 32-bit cBPF and 64-bit eBPF JIT implementations.
They are replaced by a new eBPF implementation that supports both 32-bit
and 64-bit MIPS CPUs.

Signed-off-by: Johan Almbladh <johan.almbladh@anyfinetworks.com>
Signed-off-by: Daniel Borkmann <daniel@iogearbox.net>
Signed-off-by: Andrii Nakryiko <andrii@kernel.org>
Link: https://lore.kernel.org/bpf/20211005165408.2305108-8-johan.almbladh@anyfinetworks.com

4 files changed, 0 insertions, 3603 deletions

diff --git a/arch/mips/net/bpf_jit.c b/arch/mips/net/bpf_jit.c
deleted file mode 100644
index cb6d22439f71..000000000000
--- a/arch/mips/net/bpf_jit.c
+++ /dev/null
@@ -1,1299 +0,0 @@
-/*
- * 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.
- */
-
-#include <linux/bitops.h>
-#include <linux/compiler.h>
-#include <linux/errno.h>
-#include <linux/filter.h>
-#include <linux/if_vlan.h>
-#include <linux/moduleloader.h>
-#include <linux/netdevice.h>
-#include <linux/string.h>
-#include <linux/slab.h>
-#include <linux/types.h>
-#include <asm/asm.h>
-#include <asm/bitops.h>
-#include <asm/cacheflush.h>
-#include <asm/cpu-features.h>
-#include <asm/uasm.h>
-
-#include "bpf_jit.h"
-
-/* ABI
- * r_skb_hl	SKB header length
- * r_data	SKB data pointer
- * r_off	Offset
- * r_A		BPF register A
- * r_X		BPF register X
- * r_skb	*skb
- * r_M		*scratch memory
- * r_skb_len	SKB length
- *
- * On entry (*bpf_func)(*skb, *filter)
- * a0 = MIPS_R_A0 = skb;
- * a1 = MIPS_R_A1 = filter;
- *
- * Stack
- * ...
- * M[15]
- * M[14]
- * M[13]
- * ...
- * M[0] <-- r_M
- * saved reg k-1
- * saved reg k-2
- * ...
- * saved reg 0 <-- r_sp
- * <no argument area>
- *
- *                     Packet layout
- *
- * <--------------------- len ------------------------>
- * <--skb-len(r_skb_hl)-->< ----- skb->data_len ------>
- * ----------------------------------------------------
- * |                  skb->data                       |
- * ----------------------------------------------------
- */
-
-#define ptr typeof(unsigned long)
-
-#define SCRATCH_OFF(k)		(4 * (k))
-
-/* JIT flags */
-#define SEEN_CALL		(1 << BPF_MEMWORDS)
-#define SEEN_SREG_SFT		(BPF_MEMWORDS + 1)
-#define SEEN_SREG_BASE		(1 << SEEN_SREG_SFT)
-#define SEEN_SREG(x)		(SEEN_SREG_BASE << (x))
-#define SEEN_OFF		SEEN_SREG(2)
-#define SEEN_A			SEEN_SREG(3)
-#define SEEN_X			SEEN_SREG(4)
-#define SEEN_SKB		SEEN_SREG(5)
-#define SEEN_MEM		SEEN_SREG(6)
-/* SEEN_SK_DATA also implies skb_hl an skb_len */
-#define SEEN_SKB_DATA		(SEEN_SREG(7) | SEEN_SREG(1) | SEEN_SREG(0))
-
-/* Arguments used by JIT */
-#define ARGS_USED_BY_JIT	2 /* only applicable to 64-bit */
-
-#define SBIT(x)			(1 << (x)) /* Signed version of BIT() */
-
-/**
- * struct jit_ctx - JIT context
- * @skf:		The sk_filter
- * @prologue_bytes:	Number of bytes for prologue
- * @idx:		Instruction index
- * @flags:		JIT flags
- * @offsets:		Instruction offsets
- * @target:		Memory location for the compiled filter
- */
-struct jit_ctx {
-	const struct bpf_prog *skf;
-	unsigned int prologue_bytes;
-	u32 idx;
-	u32 flags;
-	u32 *offsets;
-	u32 *target;
-};
-
-
-static inline int optimize_div(u32 *k)
-{
-	/* power of 2 divides can be implemented with right shift */
-	if (!(*k & (*k-1))) {
-		*k = ilog2(*k);
-		return 1;
-	}
-
-	return 0;
-}
-
-static inline void emit_jit_reg_move(ptr dst, ptr src, struct jit_ctx *ctx);
-
-/* Simply emit the instruction if the JIT memory space has been allocated */
-#define emit_instr(ctx, func, ...)			\
-do {							\
-	if ((ctx)->target != NULL) {			\
-		u32 *p = &(ctx)->target[ctx->idx];	\
-		uasm_i_##func(&p, ##__VA_ARGS__);	\
-	}						\
-	(ctx)->idx++;					\
-} while (0)
-
-/*
- * Similar to emit_instr but it must be used when we need to emit
- * 32-bit or 64-bit instructions
- */
-#define emit_long_instr(ctx, func, ...)			\
-do {							\
-	if ((ctx)->target != NULL) {			\
-		u32 *p = &(ctx)->target[ctx->idx];	\
-		UASM_i_##func(&p, ##__VA_ARGS__);	\
-	}						\
-	(ctx)->idx++;					\
-} while (0)
-
-/* Determine if immediate is within the 16-bit signed range */
-static inline bool is_range16(s32 imm)
-{
-	return !(imm >= SBIT(15) || imm < -SBIT(15));
-}
-
-static inline void emit_addu(unsigned int dst, unsigned int src1,
-			     unsigned int src2, struct jit_ctx *ctx)
-{
-	emit_instr(ctx, addu, dst, src1, src2);
-}
-
-static inline void emit_nop(struct jit_ctx *ctx)
-{
-	emit_instr(ctx, nop);
-}
-
-/* Load a u32 immediate to a register */
-static inline void emit_load_imm(unsigned int dst, u32 imm, struct jit_ctx *ctx)
-{
-	if (ctx->target != NULL) {
-		/* addiu can only handle s16 */
-		if (!is_range16(imm)) {
-			u32 *p = &ctx->target[ctx->idx];
-			uasm_i_lui(&p, r_tmp_imm, (s32)imm >> 16);
-			p = &ctx->target[ctx->idx + 1];
-			uasm_i_ori(&p, dst, r_tmp_imm, imm & 0xffff);
-		} else {
-			u32 *p = &ctx->target[ctx->idx];
-			uasm_i_addiu(&p, dst, r_zero, imm);
-		}
-	}
-	ctx->idx++;
-
-	if (!is_range16(imm))
-		ctx->idx++;
-}
-
-static inline void emit_or(unsigned int dst, unsigned int src1,
-			   unsigned int src2, struct jit_ctx *ctx)
-{
-	emit_instr(ctx, or, dst, src1, src2);
-}
-
-static inline void emit_ori(unsigned int dst, unsigned src, u32 imm,
-			    struct jit_ctx *ctx)
-{
-	if (imm >= BIT(16)) {
-		emit_load_imm(r_tmp, imm, ctx);
-		emit_or(dst, src, r_tmp, ctx);
-	} else {
-		emit_instr(ctx, ori, dst, src, imm);
-	}
-}
-
-static inline void emit_daddiu(unsigned int dst, unsigned int src,
-			       int imm, struct jit_ctx *ctx)
-{
-	/*
-	 * Only used for stack, so the imm is relatively small
-	 * and it fits in 15-bits
-	 */
-	emit_instr(ctx, daddiu, dst, src, imm);
-}
-
-static inline void emit_addiu(unsigned int dst, unsigned int src,
-			      u32 imm, struct jit_ctx *ctx)
-{
-	if (!is_range16(imm)) {
-		emit_load_imm(r_tmp, imm, ctx);
-		emit_addu(dst, r_tmp, src, ctx);
-	} else {
-		emit_instr(ctx, addiu, dst, src, imm);
-	}
-}
-
-static inline void emit_and(unsigned int dst, unsigned int src1,
-			    unsigned int src2, struct jit_ctx *ctx)
-{
-	emit_instr(ctx, and, dst, src1, src2);
-}
-
-static inline void emit_andi(unsigned int dst, unsigned int src,
-			     u32 imm, struct jit_ctx *ctx)
-{
-	/* If imm does not fit in u16 then load it to register */
-	if (imm >= BIT(16)) {
-		emit_load_imm(r_tmp, imm, ctx);
-		emit_and(dst, src, r_tmp, ctx);
-	} else {
-		emit_instr(ctx, andi, dst, src, imm);
-	}
-}
-
-static inline void emit_xor(unsigned int dst, unsigned int src1,
-			    unsigned int src2, struct jit_ctx *ctx)
-{
-	emit_instr(ctx, xor, dst, src1, src2);
-}
-
-static inline void emit_xori(ptr dst, ptr src, u32 imm, struct jit_ctx *ctx)
-{
-	/* If imm does not fit in u16 then load it to register */
-	if (imm >= BIT(16)) {
-		emit_load_imm(r_tmp, imm, ctx);
-		emit_xor(dst, src, r_tmp, ctx);
-	} else {
-		emit_instr(ctx, xori, dst, src, imm);
-	}
-}
-
-static inline void emit_stack_offset(int offset, struct jit_ctx *ctx)
-{
-	emit_long_instr(ctx, ADDIU, r_sp, r_sp, offset);
-}
-
-static inline void emit_subu(unsigned int dst, unsigned int src1,
-			     unsigned int src2, struct jit_ctx *ctx)
-{
-	emit_instr(ctx, subu, dst, src1, src2);
-}
-
-static inline void emit_neg(unsigned int reg, struct jit_ctx *ctx)
-{
-	emit_subu(reg, r_zero, reg, ctx);
-}
-
-static inline void emit_sllv(unsigned int dst, unsigned int src,
-			     unsigned int sa, struct jit_ctx *ctx)
-{
-	emit_instr(ctx, sllv, dst, src, sa);
-}
-
-static inline void emit_sll(unsigned int dst, unsigned int src,
-			    unsigned int sa, struct jit_ctx *ctx)
-{
-	/* sa is 5-bits long */
-	if (sa >= BIT(5))
-		/* Shifting >= 32 results in zero */
-		emit_jit_reg_move(dst, r_zero, ctx);
-	else
-		emit_instr(ctx, sll, dst, src, sa);
-}
-
-static inline void emit_srlv(unsigned int dst, unsigned int src,
-			     unsigned int sa, struct jit_ctx *ctx)
-{
-	emit_instr(ctx, srlv, dst, src, sa);
-}
-
-static inline void emit_srl(unsigned int dst, unsigned int src,
-			    unsigned int sa, struct jit_ctx *ctx)
-{
-	/* sa is 5-bits long */
-	if (sa >= BIT(5))
-		/* Shifting >= 32 results in zero */
-		emit_jit_reg_move(dst, r_zero, ctx);
-	else
-		emit_instr(ctx, srl, dst, src, sa);
-}
-
-static inline void emit_slt(unsigned int dst, unsigned int src1,
-			    unsigned int src2, struct jit_ctx *ctx)
-{
-	emit_instr(ctx, slt, dst, src1, src2);
-}
-
-static inline void emit_sltu(unsigned int dst, unsigned int src1,
-			     unsigned int src2, struct jit_ctx *ctx)
-{
-	emit_instr(ctx, sltu, dst, src1, src2);
-}
-
-static inline void emit_sltiu(unsigned dst, unsigned int src,
-			      unsigned int imm, struct jit_ctx *ctx)
-{
-	/* 16 bit immediate */
-	if (!is_range16((s32)imm)) {
-		emit_load_imm(r_tmp, imm, ctx);
-		emit_sltu(dst, src, r_tmp, ctx);
-	} else {
-		emit_instr(ctx, sltiu, dst, src, imm);
-	}
-
-}
-
-/* Store register on the stack */
-static inline void emit_store_stack_reg(ptr reg, ptr base,
-					unsigned int offset,
-					struct jit_ctx *ctx)
-{
-	emit_long_instr(ctx, SW, reg, offset, base);
-}
-
-static inline void emit_store(ptr reg, ptr base, unsigned int offset,
-			      struct jit_ctx *ctx)
-{
-	emit_instr(ctx, sw, reg, offset, base);
-}
-
-static inline void emit_load_stack_reg(ptr reg, ptr base,
-				       unsigned int offset,
-				       struct jit_ctx *ctx)
-{
-	emit_long_instr(ctx, LW, reg, offset, base);
-}
-
-static inline void emit_load(unsigned int reg, unsigned int base,
-			     unsigned int offset, struct jit_ctx *ctx)
-{
-	emit_instr(ctx, lw, reg, offset, base);
-}
-
-static inline void emit_load_byte(unsigned int reg, unsigned int base,
-				  unsigned int offset, struct jit_ctx *ctx)
-{
-	emit_instr(ctx, lb, reg, offset, base);
-}
-
-static inline void emit_half_load(unsigned int reg, unsigned int base,
-				  unsigned int offset, struct jit_ctx *ctx)
-{
-	emit_instr(ctx, lh, reg, offset, base);
-}
-
-static inline void emit_half_load_unsigned(unsigned int reg, unsigned int base,
-					   unsigned int offset, struct jit_ctx *ctx)
-{
-	emit_instr(ctx, lhu, reg, offset, base);
-}
-
-static inline void emit_mul(unsigned int dst, unsigned int src1,
-			    unsigned int src2, struct jit_ctx *ctx)
-{
-	emit_instr(ctx, mul, dst, src1, src2);
-}
-
-static inline void emit_div(unsigned int dst, unsigned int src,
-			    struct jit_ctx *ctx)
-{
-	if (ctx->target != NULL) {
-		u32 *p = &ctx->target[ctx->idx];
-		uasm_i_divu(&p, dst, src);
-		p = &ctx->target[ctx->idx + 1];
-		uasm_i_mflo(&p, dst);
-	}
-	ctx->idx += 2; /* 2 insts */
-}
-
-static inline void emit_mod(unsigned int dst, unsigned int src,
-			    struct jit_ctx *ctx)
-{
-	if (ctx->target != NULL) {
-		u32 *p = &ctx->target[ctx->idx];
-		uasm_i_divu(&p, dst, src);
-		p = &ctx->target[ctx->idx + 1];
-		uasm_i_mfhi(&p, dst);
-	}
-	ctx->idx += 2; /* 2 insts */
-}
-
-static inline void emit_dsll(unsigned int dst, unsigned int src,
-			     unsigned int sa, struct jit_ctx *ctx)
-{
-	emit_instr(ctx, dsll, dst, src, sa);
-}
-
-static inline void emit_dsrl32(unsigned int dst, unsigned int src,
-			       unsigned int sa, struct jit_ctx *ctx)
-{
-	emit_instr(ctx, dsrl32, dst, src, sa);
-}
-
-static inline void emit_wsbh(unsigned int dst, unsigned int src,
-			     struct jit_ctx *ctx)
-{
-	emit_instr(ctx, wsbh, dst, src);
-}
-
-/* load pointer to register */
-static inline void emit_load_ptr(unsigned int dst, unsigned int src,
-				     int imm, struct jit_ctx *ctx)
-{
-	/* src contains the base addr of the 32/64-pointer */
-	emit_long_instr(ctx, LW, dst, imm, src);
-}
-
-/* load a function pointer to register */
-static inline void emit_load_func(unsigned int reg, ptr imm,
-				  struct jit_ctx *ctx)
-{
-	if (IS_ENABLED(CONFIG_64BIT)) {
-		/* At this point imm is always 64-bit */
-		emit_load_imm(r_tmp, (u64)imm >> 32, ctx);
-		emit_dsll(r_tmp_imm, r_tmp, 16, ctx); /* left shift by 16 */
-		emit_ori(r_tmp, r_tmp_imm, (imm >> 16) & 0xffff, ctx);
-		emit_dsll(r_tmp_imm, r_tmp, 16, ctx); /* left shift by 16 */
-		emit_ori(reg, r_tmp_imm, imm & 0xffff, ctx);
-	} else {
-		emit_load_imm(reg, imm, ctx);
-	}
-}
-
-/* Move to real MIPS register */
-static inline void emit_reg_move(ptr dst, ptr src, struct jit_ctx *ctx)
-{
-	emit_long_instr(ctx, ADDU, dst, src, r_zero);
-}
-
-/* Move to JIT (32-bit) register */
-static inline void emit_jit_reg_move(ptr dst, ptr src, struct jit_ctx *ctx)
-{
-	emit_addu(dst, src, r_zero, ctx);
-}
-
-/* Compute the immediate value for PC-relative branches. */
-static inline u32 b_imm(unsigned int tgt, struct jit_ctx *ctx)
-{
-	if (ctx->target == NULL)
-		return 0;
-
-	/*
-	 * We want a pc-relative branch. We only do forward branches
-	 * so tgt is always after pc. tgt is the instruction offset
-	 * we want to jump to.
-
-	 * Branch on MIPS:
-	 * I: target_offset <- sign_extend(offset)
-	 * I+1: PC += target_offset (delay slot)
-	 *
-	 * ctx->idx currently points to the branch instruction
-	 * but the offset is added to the delay slot so we need
-	 * to subtract 4.
-	 */
-	return ctx->offsets[tgt] -
-		(ctx->idx * 4 - ctx->prologue_bytes) - 4;
-}
-
-static inline void emit_bcond(int cond, unsigned int reg1, unsigned int reg2,
-			     unsigned int imm, struct jit_ctx *ctx)
-{
-	if (ctx->target != NULL) {
-		u32 *p = &ctx->target[ctx->idx];
-
-		switch (cond) {
-		case MIPS_COND_EQ:
-			uasm_i_beq(&p, reg1, reg2, imm);
-			break;
-		case MIPS_COND_NE:
-			uasm_i_bne(&p, reg1, reg2, imm);
-			break;
-		case MIPS_COND_ALL:
-			uasm_i_b(&p, imm);
-			break;
-		default:
-			pr_warn("%s: Unhandled branch conditional: %d\n",
-				__func__, cond);
-		}
-	}
-	ctx->idx++;
-}
-
-static inline void emit_b(unsigned int imm, struct jit_ctx *ctx)
-{
-	emit_bcond(MIPS_COND_ALL, r_zero, r_zero, imm, ctx);
-}
-
-static inline void emit_jalr(unsigned int link, unsigned int reg,
-			     struct jit_ctx *ctx)
-{
-	emit_instr(ctx, jalr, link, reg);
-}
-
-static inline void emit_jr(unsigned int reg, struct jit_ctx *ctx)
-{
-	emit_instr(ctx, jr, reg);
-}
-
-static inline u16 align_sp(unsigned int num)
-{
-	/* Double word alignment for 32-bit, quadword for 64-bit */
-	unsigned int align = IS_ENABLED(CONFIG_64BIT) ? 16 : 8;
-	num = (num + (align - 1)) & -align;
-	return num;
-}
-
-static void save_bpf_jit_regs(struct jit_ctx *ctx, unsigned offset)
-{
-	int i = 0, real_off = 0;
-	u32 sflags, tmp_flags;
-
-	/* Adjust the stack pointer */
-	if (offset)
-		emit_stack_offset(-align_sp(offset), ctx);
-
-	tmp_flags = sflags = ctx->flags >> SEEN_SREG_SFT;
-	/* sflags is essentially a bitmap */
-	while (tmp_flags) {
-		if ((sflags >> i) & 0x1) {
-			emit_store_stack_reg(MIPS_R_S0 + i, r_sp, real_off,
-					     ctx);
-			real_off += SZREG;
-		}
-		i++;
-		tmp_flags >>= 1;
-	}
-
-	/* save return address */
-	if (ctx->flags & SEEN_CALL) {
-		emit_store_stack_reg(r_ra, r_sp, real_off, ctx);
-		real_off += SZREG;
-	}
-
-	/* Setup r_M leaving the alignment gap if necessary */
-	if (ctx->flags & SEEN_MEM) {
-		if (real_off % (SZREG * 2))
-			real_off += SZREG;
-		emit_long_instr(ctx, ADDIU, r_M, r_sp, real_off);
-	}
-}
-
-static void restore_bpf_jit_regs(struct jit_ctx *ctx,
-				 unsigned int offset)
-{
-	int i, real_off = 0;
-	u32 sflags, tmp_flags;
-
-	tmp_flags = sflags = ctx->flags >> SEEN_SREG_SFT;
-	/* sflags is a bitmap */
-	i = 0;
-	while (tmp_flags) {
-		if ((sflags >> i) & 0x1) {
-			emit_load_stack_reg(MIPS_R_S0 + i, r_sp, real_off,
-					    ctx);
-			real_off += SZREG;
-		}
-		i++;
-		tmp_flags >>= 1;
-	}
-
-	/* restore return address */
-	if (ctx->flags & SEEN_CALL)
-		emit_load_stack_reg(r_ra, r_sp, real_off, ctx);
-
-	/* Restore the sp and discard the scrach memory */
-	if (offset)
-		emit_stack_offset(align_sp(offset), ctx);
-}
-
-static unsigned int get_stack_depth(struct jit_ctx *ctx)
-{
-	int sp_off = 0;
-
-
-	/* How may s* regs do we need to preserved? */
-	sp_off += hweight32(ctx->flags >> SEEN_SREG_SFT) * SZREG;
-
-	if (ctx->flags & SEEN_MEM)
-		sp_off += 4 * BPF_MEMWORDS; /* BPF_MEMWORDS are 32-bit */
-
-	if (ctx->flags & SEEN_CALL)
-		sp_off += SZREG; /* Space for our ra register */
-
-	return sp_off;
-}
-
-static void build_prologue(struct jit_ctx *ctx)
-{
-	int sp_off;
-
-	/* Calculate the total offset for the stack pointer */
-	sp_off = get_stack_depth(ctx);
-	save_bpf_jit_regs(ctx, sp_off);
-
-	if (ctx->flags & SEEN_SKB)
-		emit_reg_move(r_skb, MIPS_R_A0, ctx);
-
-	if (ctx->flags & SEEN_SKB_DATA) {
-		/* Load packet length */
-		emit_load(r_skb_len, r_skb, offsetof(struct sk_buff, len),
-			  ctx);
-		emit_load(r_tmp, r_skb, offsetof(struct sk_buff, data_len),
-			  ctx);
-		/* Load the data pointer */
-		emit_load_ptr(r_skb_data, r_skb,
-			      offsetof(struct sk_buff, data), ctx);
-		/* Load the header length */
-		emit_subu(r_skb_hl, r_skb_len, r_tmp, ctx);
-	}
-
-	if (ctx->flags & SEEN_X)
-		emit_jit_reg_move(r_X, r_zero, ctx);
-
-	/*
-	 * Do not leak kernel data to userspace, we only need to clear
-	 * r_A if it is ever used.  In fact if it is never used, we
-	 * will not save/restore it, so clearing it in this case would
-	 * corrupt the state of the caller.
-	 */
-	if (bpf_needs_clear_a(&ctx->skf->insns[0]) &&
-	    (ctx->flags & SEEN_A))
-		emit_jit_reg_move(r_A, r_zero, ctx);
-}
-
-static void build_epilogue(struct jit_ctx *ctx)
-{
-	unsigned int sp_off;
-
-	/* Calculate the total offset for the stack pointer */
-
-	sp_off = get_stack_depth(ctx);
-	restore_bpf_jit_regs(ctx, sp_off);
-
-	/* Return */
-	emit_jr(r_ra, ctx);
-	emit_nop(ctx);
-}
-
-#define CHOOSE_LOAD_FUNC(K, func) \
-	((int)K < 0 ? ((int)K >= SKF_LL_OFF ? func##_negative : func) : \
-	 func##_positive)
-
-static bool is_bad_offset(int b_off)
-{
-	return b_off > 0x1ffff || b_off < -0x20000;
-}
-
-static int build_body(struct jit_ctx *ctx)
-{
-	const struct bpf_prog *prog = ctx->skf;
-	const struct sock_filter *inst;
-	unsigned int i, off, condt;
-	u32 k, b_off __maybe_unused;
-	u8 (*sk_load_func)(unsigned long *skb, int offset);
-
-	for (i = 0; i < prog->len; i++) {
-		u16 code;
-
-		inst = &(prog->insns[i]);
-		pr_debug("%s: code->0x%02x, jt->0x%x, jf->0x%x, k->0x%x\n",
-			 __func__, inst->code, inst->jt, inst->jf, inst->k);
-		k = inst->k;
-		code = bpf_anc_helper(inst);
-
-		if (ctx->target == NULL)
-			ctx->offsets[i] = ctx->idx * 4;
-
-		switch (code) {
-		case BPF_LD | BPF_IMM:
-			/* A <- k ==> li r_A, k */
-			ctx->flags |= SEEN_A;
-			emit_load_imm(r_A, k, ctx);
-			break;
-		case BPF_LD | BPF_W | BPF_LEN:
-			BUILD_BUG_ON(sizeof_field(struct sk_buff, len) != 4);
-			/* A <- len ==> lw r_A, offset(skb) */
-			ctx->flags |= SEEN_SKB | SEEN_A;
-			off = offsetof(struct sk_buff, len);
-			emit_load(r_A, r_skb, off, ctx);
-			break;
-		case BPF_LD | BPF_MEM:
-			/* A <- M[k] ==> lw r_A, offset(M) */
-			ctx->flags |= SEEN_MEM | SEEN_A;
-			emit_load(r_A, r_M, SCRATCH_OFF(k), ctx);
-			break;
-		case BPF_LD | BPF_W | BPF_ABS:
-			/* A <- P[k:4] */
-			sk_load_func = CHOOSE_LOAD_FUNC(k, sk_load_word);
-			goto load;
-		case BPF_LD | BPF_H | BPF_ABS:
-			/* A <- P[k:2] */
-			sk_load_func = CHOOSE_LOAD_FUNC(k, sk_load_half);
-			goto load;
-		case BPF_LD | BPF_B | BPF_ABS:
-			/* A <- P[k:1] */
-			sk_load_func = CHOOSE_LOAD_FUNC(k, sk_load_byte);
-load:
-			emit_load_imm(r_off, k, ctx);
-load_common:
-			ctx->flags |= SEEN_CALL | SEEN_OFF |
-				SEEN_SKB | SEEN_A | SEEN_SKB_DATA;
-
-			emit_load_func(r_s0, (ptr)sk_load_func, ctx);
-			emit_reg_move(MIPS_R_A0, r_skb, ctx);
-			emit_jalr(MIPS_R_RA, r_s0, ctx);
-			/* Load second argument to delay slot */
-			emit_reg_move(MIPS_R_A1, r_off, ctx);
-			/* Check the error value */
-			emit_bcond(MIPS_COND_EQ, r_ret, 0, b_imm(i + 1, ctx),
-				   ctx);
-			/* Load return register on DS for failures */
-			emit_reg_move(r_ret, r_zero, ctx);
-			/* Return with error */
-			b_off = b_imm(prog->len, ctx);
-			if (is_bad_offset(b_off))
-				return -E2BIG;
-			emit_b(b_off, ctx);
-			emit_nop(ctx);
-			break;
-		case BPF_LD | BPF_W | BPF_IND:
-			/* A <- P[X + k:4] */
-			sk_load_func = sk_load_word;
-			goto load_ind;
-		case BPF_LD | BPF_H | BPF_IND:
-			/* A <- P[X + k:2] */
-			sk_load_func = sk_load_half;
-			goto load_ind;
-		case BPF_LD | BPF_B | BPF_IND:
-			/* A <- P[X + k:1] */
-			sk_load_func = sk_load_byte;
-load_ind:
-			ctx->flags |= SEEN_OFF | SEEN_X;
-			emit_addiu(r_off, r_X, k, ctx);
-			goto load_common;
-		case BPF_LDX | BPF_IMM:
-			/* X <- k */
-			ctx->flags |= SEEN_X;
-			emit_load_imm(r_X, k, ctx);
-			break;
-		case BPF_LDX | BPF_MEM:
-			/* X <- M[k] */
-			ctx->flags |= SEEN_X | SEEN_MEM;
-			emit_load(r_X, r_M, SCRATCH_OFF(k), ctx);
-			break;
-		case BPF_LDX | BPF_W | BPF_LEN:
-			/* X <- len */
-			ctx->flags |= SEEN_X | SEEN_SKB;
-			off = offsetof(struct sk_buff, len);
-			emit_load(r_X, r_skb, off, ctx);
-			break;
-		case BPF_LDX | BPF_B | BPF_MSH:
-			/* X <- 4 * (P[k:1] & 0xf) */
-			ctx->flags |= SEEN_X | SEEN_CALL | SEEN_SKB;
-			/* Load offset to a1 */
-			emit_load_func(r_s0, (ptr)sk_load_byte, ctx);
-			/*
-			 * This may emit two instructions so it may not fit
-			 * in the delay slot. So use a0 in the delay slot.
-			 */
-			emit_load_imm(MIPS_R_A1, k, ctx);
-			emit_jalr(MIPS_R_RA, r_s0, ctx);
-			emit_reg_move(MIPS_R_A0, r_skb, ctx); /* delay slot */
-			/* Check the error value */
-			b_off = b_imm(prog->len, ctx);
-			if (is_bad_offset(b_off))
-				return -E2BIG;
-			emit_bcond(MIPS_COND_NE, r_ret, 0, b_off, ctx);
-			emit_reg_move(r_ret, r_zero, ctx);
-			/* We are good */
-			/* X <- P[1:K] & 0xf */
-			emit_andi(r_X, r_A, 0xf, ctx);
-			/* X << 2 */
-			emit_b(b_imm(i + 1, ctx), ctx);
-			emit_sll(r_X, r_X, 2, ctx); /* delay slot */
-			break;
-		case BPF_ST:
-			/* M[k] <- A */
-			ctx->flags |= SEEN_MEM | SEEN_A;
-			emit_store(r_A, r_M, SCRATCH_OFF(k), ctx);
-			break;
-		case BPF_STX:
-			/* M[k] <- X */
-			ctx->flags |= SEEN_MEM | SEEN_X;
-			emit_store(r_X, r_M, SCRATCH_OFF(k), ctx);
-			break;
-		case BPF_ALU | BPF_ADD | BPF_K:
-			/* A += K */
-			ctx->flags |= SEEN_A;
-			emit_addiu(r_A, r_A, k, ctx);
-			break;
-		case BPF_ALU | BPF_ADD | BPF_X:
-			/* A += X */
-			ctx->flags |= SEEN_A | SEEN_X;
-			emit_addu(r_A, r_A, r_X, ctx);
-			break;
-		case BPF_ALU | BPF_SUB | BPF_K:
-			/* A -= K */
-			ctx->flags |= SEEN_A;
-			emit_addiu(r_A, r_A, -k, ctx);
-			break;
-		case BPF_ALU | BPF_SUB | BPF_X:
-			/* A -= X */
-			ctx->flags |= SEEN_A | SEEN_X;
-			emit_subu(r_A, r_A, r_X, ctx);
-			break;
-		case BPF_ALU | BPF_MUL | BPF_K:
-			/* A *= K */
-			/* Load K to scratch register before MUL */
-			ctx->flags |= SEEN_A;
-			emit_load_imm(r_s0, k, ctx);
-			emit_mul(r_A, r_A, r_s0, ctx);
-			break;
-		case BPF_ALU | BPF_MUL | BPF_X:
-			/* A *= X */
-			ctx->flags |= SEEN_A | SEEN_X;
-			emit_mul(r_A, r_A, r_X, ctx);
-			break;
-		case BPF_ALU | BPF_DIV | BPF_K:
-			/* A /= k */
-			if (k == 1)
-				break;
-			if (optimize_div(&k)) {
-				ctx->flags |= SEEN_A;
-				emit_srl(r_A, r_A, k, ctx);
-				break;
-			}
-			ctx->flags |= SEEN_A;
-			emit_load_imm(r_s0, k, ctx);
-			emit_div(r_A, r_s0, ctx);
-			break;
-		case BPF_ALU | BPF_MOD | BPF_K:
-			/* A %= k */
-			if (k == 1) {
-				ctx->flags |= SEEN_A;
-				emit_jit_reg_move(r_A, r_zero, ctx);
-			} else {
-				ctx->flags |= SEEN_A;
-				emit_load_imm(r_s0, k, ctx);
-				emit_mod(r_A, r_s0, ctx);
-			}
-			break;
-		case BPF_ALU | BPF_DIV | BPF_X:
-			/* A /= X */
-			ctx->flags |= SEEN_X | SEEN_A;
-			/* Check if r_X is zero */
-			b_off = b_imm(prog->len, ctx);
-			if (is_bad_offset(b_off))
-				return -E2BIG;
-			emit_bcond(MIPS_COND_EQ, r_X, r_zero, b_off, ctx);
-			emit_load_imm(r_ret, 0, ctx); /* delay slot */
-			emit_div(r_A, r_X, ctx);
-			break;
-		case BPF_ALU | BPF_MOD | BPF_X:
-			/* A %= X */
-			ctx->flags |= SEEN_X | SEEN_A;
-			/* Check if r_X is zero */
-			b_off = b_imm(prog->len, ctx);
-			if (is_bad_offset(b_off))
-				return -E2BIG;
-			emit_bcond(MIPS_COND_EQ, r_X, r_zero, b_off, ctx);
-			emit_load_imm(r_ret, 0, ctx); /* delay slot */
-			emit_mod(r_A, r_X, ctx);
-			break;
-		case BPF_ALU | BPF_OR | BPF_K:
-			/* A |= K */
-			ctx->flags |= SEEN_A;
-			emit_ori(r_A, r_A, k, ctx);
-			break;
-		case BPF_ALU | BPF_OR | BPF_X:
-			/* A |= X */
-			ctx->flags |= SEEN_A;
-			emit_ori(r_A, r_A, r_X, ctx);
-			break;
-		case BPF_ALU | BPF_XOR | BPF_K:
-			/* A ^= k */
-			ctx->flags |= SEEN_A;
-			emit_xori(r_A, r_A, k, ctx);
-			break;
-		case BPF_ANC | SKF_AD_ALU_XOR_X:
-		case BPF_ALU | BPF_XOR | BPF_X:
-			/* A ^= X */
-			ctx->flags |= SEEN_A;
-			emit_xor(r_A, r_A, r_X, ctx);
-			break;
-		case BPF_ALU | BPF_AND | BPF_K:
-			/* A &= K */
-			ctx->flags |= SEEN_A;
-			emit_andi(r_A, r_A, k, ctx);
-			break;
-		case BPF_ALU | BPF_AND | BPF_X:
-			/* A &= X */
-			ctx->flags |= SEEN_A | SEEN_X;
-			emit_and(r_A, r_A, r_X, ctx);
-			break;
-		case BPF_ALU | BPF_LSH | BPF_K:
-			/* A <<= K */
-			ctx->flags |= SEEN_A;
-			emit_sll(r_A, r_A, k, ctx);
-			break;
-		case BPF_ALU | BPF_LSH | BPF_X:
-			/* A <<= X */
-			ctx->flags |= SEEN_A | SEEN_X;
-			emit_sllv(r_A, r_A, r_X, ctx);
-			break;
-		case BPF_ALU | BPF_RSH | BPF_K:
-			/* A >>= K */
-			ctx->flags |= SEEN_A;
-			emit_srl(r_A, r_A, k, ctx);
-			break;
-		case BPF_ALU | BPF_RSH | BPF_X:
-			ctx->flags |= SEEN_A | SEEN_X;
-			emit_srlv(r_A, r_A, r_X, ctx);
-			break;
-		case BPF_ALU | BPF_NEG:
-			/* A = -A */
-			ctx->flags |= SEEN_A;
-			emit_neg(r_A, ctx);
-			break;
-		case BPF_JMP | BPF_JA:
-			/* pc += K */
-			b_off = b_imm(i + k + 1, ctx);
-			if (is_bad_offset(b_off))
-				return -E2BIG;
-			emit_b(b_off, ctx);
-			emit_nop(ctx);
-			break;
-		case BPF_JMP | BPF_JEQ | BPF_K:
-			/* pc += ( A == K ) ? pc->jt : pc->jf */
-			condt = MIPS_COND_EQ | MIPS_COND_K;
-			goto jmp_cmp;
-		case BPF_JMP | BPF_JEQ | BPF_X:
-			ctx->flags |= SEEN_X;
-			/* pc += ( A == X ) ? pc->jt : pc->jf */
-			condt = MIPS_COND_EQ | MIPS_COND_X;
-			goto jmp_cmp;
-		case BPF_JMP | BPF_JGE | BPF_K:
-			/* pc += ( A >= K ) ? pc->jt : pc->jf */
-			condt = MIPS_COND_GE | MIPS_COND_K;
-			goto jmp_cmp;
-		case BPF_JMP | BPF_JGE | BPF_X:
-			ctx->flags |= SEEN_X;
-			/* pc += ( A >= X ) ? pc->jt : pc->jf */
-			condt = MIPS_COND_GE | MIPS_COND_X;
-			goto jmp_cmp;
-		case BPF_JMP | BPF_JGT | BPF_K:
-			/* pc += ( A > K ) ? pc->jt : pc->jf */
-			condt = MIPS_COND_GT | MIPS_COND_K;
-			goto jmp_cmp;
-		case BPF_JMP | BPF_JGT | BPF_X:
-			ctx->flags |= SEEN_X;
-			/* pc += ( A > X ) ? pc->jt : pc->jf */
-			condt = MIPS_COND_GT | MIPS_COND_X;
-jmp_cmp:
-			/* Greater or Equal */
-			if ((condt & MIPS_COND_GE) ||
-			    (condt & MIPS_COND_GT)) {
-				if (condt & MIPS_COND_K) { /* K */
-					ctx->flags |= SEEN_A;
-					emit_sltiu(r_s0, r_A, k, ctx);
-				} else { /* X */
-					ctx->flags |= SEEN_A |
-						SEEN_X;
-					emit_sltu(r_s0, r_A, r_X, ctx);
-				}
-				/* A < (K|X) ? r_scrach = 1 */
-				b_off = b_imm(i + inst->jf + 1, ctx);
-				emit_bcond(MIPS_COND_NE, r_s0, r_zero, b_off,
-					   ctx);
-				emit_nop(ctx);
-				/* A > (K|X) ? scratch = 0 */
-				if (condt & MIPS_COND_GT) {
-					/* Checking for equality */
-					ctx->flags |= SEEN_A | SEEN_X;
-					if (condt & MIPS_COND_K)
-						emit_load_imm(r_s0, k, ctx);
-					else
-						emit_jit_reg_move(r_s0, r_X,
-								  ctx);
-					b_off = b_imm(i + inst->jf + 1, ctx);
-					emit_bcond(MIPS_COND_EQ, r_A, r_s0,
-						   b_off, ctx);
-					emit_nop(ctx);
-					/* Finally, A > K|X */
-					b_off = b_imm(i + inst->jt + 1, ctx);
-					emit_b(b_off, ctx);
-					emit_nop(ctx);
-				} else {
-					/* A >= (K|X) so jump */
-					b_off = b_imm(i + inst->jt + 1, ctx);
-					emit_b(b_off, ctx);
-					emit_nop(ctx);
-				}
-			} else {
-				/* A == K|X */
-				if (condt & MIPS_COND_K) { /* K */
-					ctx->flags |= SEEN_A;
-					emit_load_imm(r_s0, k, ctx);
-					/* jump true */
-					b_off = b_imm(i + inst->jt + 1, ctx);
-					emit_bcond(MIPS_COND_EQ, r_A, r_s0,
-						   b_off, ctx);
-					emit_nop(ctx);
-					/* jump false */
-					b_off = b_imm(i + inst->jf + 1,
-						      ctx);
-					emit_bcond(MIPS_COND_NE, r_A, r_s0,
-						   b_off, ctx);
-					emit_nop(ctx);
-				} else { /* X */
-					/* jump true */
-					ctx->flags |= SEEN_A | SEEN_X;
-					b_off = b_imm(i + inst->jt + 1,
-						      ctx);
-					emit_bcond(MIPS_COND_EQ, r_A, r_X,
-						   b_off, ctx);
-					emit_nop(ctx);
-					/* jump false */
-					b_off = b_imm(i + inst->jf + 1, ctx);
-					emit_bcond(MIPS_COND_NE, r_A, r_X,
-						   b_off, ctx);
-					emit_nop(ctx);
-				}
-			}
-			break;
-		case BPF_JMP | BPF_JSET | BPF_K:
-			ctx->flags |= SEEN_A;
-			/* pc += (A & K) ? pc -> jt : pc -> jf */
-			emit_load_imm(r_s1, k, ctx);
-			emit_and(r_s0, r_A, r_s1, ctx);
-			/* jump true */
-			b_off = b_imm(i + inst->jt + 1, ctx);
-			emit_bcond(MIPS_COND_NE, r_s0, r_zero, b_off, ctx);
-			emit_nop(ctx);
-			/* jump false */
-			b_off = b_imm(i + inst->jf + 1, ctx);
-			emit_b(b_off, ctx);
-			emit_nop(ctx);
-			break;
-		case BPF_JMP | BPF_JSET | BPF_X:
-			ctx->flags |= SEEN_X | SEEN_A;
-			/* pc += (A & X) ? pc -> jt : pc -> jf */
-			emit_and(r_s0, r_A, r_X, ctx);
-			/* jump true */
-			b_off = b_imm(i + inst->jt + 1, ctx);
-			emit_bcond(MIPS_COND_NE, r_s0, r_zero, b_off, ctx);
-			emit_nop(ctx);
-			/* jump false */
-			b_off = b_imm(i + inst->jf + 1, ctx);
-			emit_b(b_off, ctx);
-			emit_nop(ctx);
-			break;
-		case BPF_RET | BPF_A:
-			ctx->flags |= SEEN_A;
-			if (i != prog->len - 1) {
-				/*
-				 * If this is not the last instruction
-				 * then jump to the epilogue
-				 */
-				b_off = b_imm(prog->len, ctx);
-				if (is_bad_offset(b_off))
-					return -E2BIG;
-				emit_b(b_off, ctx);
-			}
-			emit_reg_move(r_ret, r_A, ctx); /* delay slot */
-			break;
-		case BPF_RET | BPF_K:
-			/*
-			 * It can emit two instructions so it does not fit on
-			 * the delay slot.
-			 */
-			emit_load_imm(r_ret, k, ctx);
-			if (i != prog->len - 1) {
-				/*
-				 * If this is not the last instruction
-				 * then jump to the epilogue
-				 */
-				b_off = b_imm(prog->len, ctx);
-				if (is_bad_offset(b_off))
-					return -E2BIG;
-				emit_b(b_off, ctx);
-				emit_nop(ctx);
-			}
-			break;
-		case BPF_MISC | BPF_TAX:
-			/* X = A */
-			ctx->flags |= SEEN_X | SEEN_A;
-			emit_jit_reg_move(r_X, r_A, ctx);
-			break;
-		case BPF_MISC | BPF_TXA:
-			/* A = X */
-			ctx->flags |= SEEN_A | SEEN_X;
-			emit_jit_reg_move(r_A, r_X, ctx);
-			break;
-		/* AUX */
-		case BPF_ANC | SKF_AD_PROTOCOL:
-			/* A = ntohs(skb->protocol */
-			ctx->flags |= SEEN_SKB | SEEN_OFF | SEEN_A;
-			BUILD_BUG_ON(sizeof_field(struct sk_buff,
-						  protocol) != 2);
-			off = offsetof(struct sk_buff, protocol);
-			emit_half_load(r_A, r_skb, off, ctx);
-#ifdef CONFIG_CPU_LITTLE_ENDIAN
-			/* This needs little endian fixup */
-			if (cpu_has_wsbh) {
-				/* R2 and later have the wsbh instruction */
-				emit_wsbh(r_A, r_A, ctx);
-			} else {
-				/* Get first byte */
-				emit_andi(r_tmp_imm, r_A, 0xff, ctx);
-				/* Shift it */
-				emit_sll(r_tmp, r_tmp_imm, 8, ctx);
-				/* Get second byte */
-				emit_srl(r_tmp_imm, r_A, 8, ctx);
-				emit_andi(r_tmp_imm, r_tmp_imm, 0xff, ctx);
-				/* Put everyting together in r_A */
-				emit_or(r_A, r_tmp, r_tmp_imm, ctx);
-			}
-#endif
-			break;
-		case BPF_ANC | SKF_AD_CPU:
-			ctx->flags |= SEEN_A | SEEN_OFF;
-			/* A = current_thread_info()->cpu */
-			BUILD_BUG_ON(sizeof_field(struct thread_info,
-						  cpu) != 4);
-			off = offsetof(struct thread_info, cpu);
-			/* $28/gp points to the thread_info struct */
-			emit_load(r_A, 28, off, ctx);
-			break;
-		case BPF_ANC | SKF_AD_IFINDEX:
-			/* A = skb->dev->ifindex */
-		case BPF_ANC | SKF_AD_HATYPE:
-			/* A = skb->dev->type */
-			ctx->flags |= SEEN_SKB | SEEN_A;
-			off = offsetof(struct sk_buff, dev);
-			/* Load *dev pointer */
-			emit_load_ptr(r_s0, r_skb, off, ctx);
-			/* error (0) in the delay slot */
-			b_off = b_imm(prog->len, ctx);
-			if (is_bad_offset(b_off))
-				return -E2BIG;
-			emit_bcond(MIPS_COND_EQ, r_s0, r_zero, b_off, ctx);
-			emit_reg_move(r_ret, r_zero, ctx);
-			if (code == (BPF_ANC | SKF_AD_IFINDEX)) {
-				BUILD_BUG_ON(sizeof_field(struct net_device, ifindex) != 4);
-				off = offsetof(struct net_device, ifindex);
-				emit_load(r_A, r_s0, off, ctx);
-			} else { /* (code == (BPF_ANC | SKF_AD_HATYPE) */
-				BUILD_BUG_ON(sizeof_field(struct net_device, type) != 2);
-				off = offsetof(struct net_device, type);
-				emit_half_load_unsigned(r_A, r_s0, off, ctx);
-			}
-			break;
-		case BPF_ANC | SKF_AD_MARK:
-			ctx->flags |= SEEN_SKB | SEEN_A;
-			BUILD_BUG_ON(sizeof_field(struct sk_buff, mark) != 4);
-			off = offsetof(struct sk_buff, mark);
-			emit_load(r_A, r_skb, off, ctx);
-			break;
-		case BPF_ANC | SKF_AD_RXHASH:
-			ctx->flags |= SEEN_SKB | SEEN_A;
-			BUILD_BUG_ON(sizeof_field(struct sk_buff, hash) != 4);
-			off = offsetof(struct sk_buff, hash);
-			emit_load(r_A, r_skb, off, ctx);
-			break;
-		case BPF_ANC | SKF_AD_VLAN_TAG:
-			ctx->flags |= SEEN_SKB | SEEN_A;
-			BUILD_BUG_ON(sizeof_field(struct sk_buff,
-						  vlan_tci) != 2);
-			off = offsetof(struct sk_buff, vlan_tci);
-			emit_half_load_unsigned(r_A, r_skb, off, ctx);
-			break;
-		case BPF_ANC | SKF_AD_VLAN_TAG_PRESENT:
-			ctx->flags |= SEEN_SKB | SEEN_A;
-			emit_load_byte(r_A, r_skb, PKT_VLAN_PRESENT_OFFSET(), ctx);
-			if (PKT_VLAN_PRESENT_BIT)
-				emit_srl(r_A, r_A, PKT_VLAN_PRESENT_BIT, ctx);
-			if (PKT_VLAN_PRESENT_BIT < 7)
-				emit_andi(r_A, r_A, 1, ctx);
-			break;
-		case BPF_ANC | SKF_AD_PKTTYPE:
-			ctx->flags |= SEEN_SKB;
-
-			emit_load_byte(r_tmp, r_skb, PKT_TYPE_OFFSET(), ctx);
-			/* Keep only the last 3 bits */
-			emit_andi(r_A, r_tmp, PKT_TYPE_MAX, ctx);
-#ifdef __BIG_ENDIAN_BITFIELD
-			/* Get the actual packet type to the lower 3 bits */
-			emit_srl(r_A, r_A, 5, ctx);
-#endif
-			break;
-		case BPF_ANC | SKF_AD_QUEUE:
-			ctx->flags |= SEEN_SKB | SEEN_A;
-			BUILD_BUG_ON(sizeof_field(struct sk_buff,
-						  queue_mapping) != 2);
-			BUILD_BUG_ON(offsetof(struct sk_buff,
-					      queue_mapping) > 0xff);
-			off = offsetof(struct sk_buff, queue_mapping);
-			emit_half_load_unsigned(r_A, r_skb, off, ctx);
-			break;
-		default:
-			pr_debug("%s: Unhandled opcode: 0x%02x\n", __FILE__,
-				 inst->code);
-			return -1;
-		}
-	}
-
-	/* compute offsets only during the first pass */
-	if (ctx->target == NULL)
-		ctx->offsets[i] = ctx->idx * 4;
-
-	return 0;
-}
-
-void bpf_jit_compile(struct bpf_prog *fp)
-{
-	struct jit_ctx ctx;
-	unsigned int alloc_size, tmp_idx;
-
-	if (!bpf_jit_enable)
-		return;
-
-	memset(&ctx, 0, sizeof(ctx));
-
-	ctx.offsets = kcalloc(fp->len + 1, sizeof(*ctx.offsets), GFP_KERNEL);
-	if (ctx.offsets == NULL)
-		return;
-
-	ctx.skf = fp;
-
-	if (build_body(&ctx))
-		goto out;
-
-	tmp_idx = ctx.idx;
-	build_prologue(&ctx);
-	ctx.prologue_bytes = (ctx.idx - tmp_idx) * 4;
-	/* just to complete the ctx.idx count */
-	build_epilogue(&ctx);
-
-	alloc_size = 4 * ctx.idx;
-	ctx.target = module_alloc(alloc_size);
-	if (ctx.target == NULL)
-		goto out;
-
-	/* Clean it */
-	memset(ctx.target, 0, alloc_size);
-
-	ctx.idx = 0;
-
-	/* Generate the actual JIT code */
-	build_prologue(&ctx);
-	if (build_body(&ctx)) {
-		module_memfree(ctx.target);
-		goto out;
-	}
-	build_epilogue(&ctx);
-
-	/* Update the icache */
-	flush_icache_range((ptr)ctx.target, (ptr)(ctx.target + ctx.idx));
-
-	if (bpf_jit_enable > 1)
-		/* Dump JIT code */
-		bpf_jit_dump(fp->len, alloc_size, 2, ctx.target);
-
-	fp->bpf_func = (void *)ctx.target;
-	fp->jited = 1;
-
-out:
-	kfree(ctx.offsets);
-}
-
-void bpf_jit_free(struct bpf_prog *fp)
-{
-	if (fp->jited)
-		module_memfree(fp->bpf_func);
-
-	bpf_prog_unlock_free(fp);
-}
diff --git a/arch/mips/net/bpf_jit.h b/arch/mips/net/bpf_jit.h
deleted file mode 100644
index 166ca06c9da9..000000000000
--- a/arch/mips/net/bpf_jit.h
+++ /dev/null
@@ -1,81 +0,0 @@
-/* SPDX-License-Identifier: GPL-2.0-only */
-/*
- * Just-In-Time compiler for BPF filters on MIPS
- *
- * Copyright (c) 2014 Imagination Technologies Ltd.
- * Author: Markos Chandras <markos.chandras@imgtec.com>
- */
-
-#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 */
diff --git a/arch/mips/net/bpf_jit_asm.S b/arch/mips/net/bpf_jit_asm.S
deleted file mode 100644
index 57154c5883b6..000000000000
--- a/arch/mips/net/bpf_jit_asm.S
+++ /dev/null
@@ -1,285 +0,0 @@
-/*
- * bpf_jib_asm.S: Packet/header access helper functions for MIPS/MIPS64 BPF
- * compiler.
- *
- * Copyright (C) 2015 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.
- */
-
-#include <asm/asm.h>
-#include <asm/isa-rev.h>
-#include <asm/regdef.h>
-#include "bpf_jit.h"
-
-/* ABI
- *
- * r_skb_hl	skb header length
- * r_skb_data	skb data
- * r_off(a1)	offset register
- * r_A		BPF register A
- * r_X		PF register X
- * r_skb(a0)	*skb
- * r_M		*scratch memory
- * r_skb_le	skb length
- * r_s0		Scratch register 0
- * r_s1		Scratch register 1
- *
- * On entry:
- * a0: *skb
- * a1: offset (imm or imm + X)
- *
- * All non-BPF-ABI registers are free for use. On return, we only
- * care about r_ret. The BPF-ABI registers are assumed to remain
- * unmodified during the entire filter operation.
- */
-
-#define skb	a0
-#define offset	a1
-#define SKF_LL_OFF  (-0x200000) /* Can't include linux/filter.h in assembly */
-
-	/* We know better :) so prevent assembler reordering etc */
-	.set 	noreorder
-
-#define is_offset_negative(TYPE)				\
-	/* If offset is negative we have more work to do */	\
-	slti	t0, offset, 0;					\
-	bgtz	t0, bpf_slow_path_##TYPE##_neg;			\
-	/* Be careful what follows in DS. */
-
-#define is_offset_in_header(SIZE, TYPE)				\
-	/* Reading from header? */				\
-	addiu	$r_s0, $r_skb_hl, -SIZE;			\
-	slt	t0, $r_s0, offset;				\
-	bgtz	t0, bpf_slow_path_##TYPE;			\
-
-LEAF(sk_load_word)
-	is_offset_negative(word)
-FEXPORT(sk_load_word_positive)
-	is_offset_in_header(4, word)
-	/* Offset within header boundaries */
-	PTR_ADDU t1, $r_skb_data, offset
-	.set	reorder
-	lw	$r_A, 0(t1)
-	.set	noreorder
-#ifdef CONFIG_CPU_LITTLE_ENDIAN
-# if MIPS_ISA_REV >= 2
-	wsbh	t0, $r_A
-	rotr	$r_A, t0, 16
-# else
-	sll	t0, $r_A, 24
-	srl	t1, $r_A, 24
-	srl	t2, $r_A, 8
-	or	t0, t0, t1
-	andi	t2, t2, 0xff00
-	andi	t1, $r_A, 0xff00
-	or	t0, t0, t2
-	sll	t1, t1, 8
-	or	$r_A, t0, t1
-# endif
-#endif
-	jr	$r_ra
-	 move	$r_ret, zero
-	END(sk_load_word)
-
-LEAF(sk_load_half)
-	is_offset_negative(half)
-FEXPORT(sk_load_half_positive)
-	is_offset_in_header(2, half)
-	/* Offset within header boundaries */
-	PTR_ADDU t1, $r_skb_data, offset
-	lhu	$r_A, 0(t1)
-#ifdef CONFIG_CPU_LITTLE_ENDIAN
-# if MIPS_ISA_REV >= 2
-	wsbh	$r_A, $r_A
-# else
-	sll	t0, $r_A, 8
-	srl	t1, $r_A, 8
-	andi	t0, t0, 0xff00
-	or	$r_A, t0, t1
-# endif
-#endif
-	jr	$r_ra
-	 move	$r_ret, zero
-	END(sk_load_half)
-
-LEAF(sk_load_byte)
-	is_offset_negative(byte)
-FEXPORT(sk_load_byte_positive)
-	is_offset_in_header(1, byte)
-	/* Offset within header boundaries */
-	PTR_ADDU t1, $r_skb_data, offset
-	lbu	$r_A, 0(t1)
-	jr	$r_ra
-	 move	$r_ret, zero
-	END(sk_load_byte)
-
-/*
- * call skb_copy_bits:
- * (prototype in linux/skbuff.h)
- *
- * int skb_copy_bits(sk_buff *skb, int offset, void *to, int len)
- *
- * o32 mandates we leave 4 spaces for argument registers in case
- * the callee needs to use them. Even though we don't care about
- * the argument registers ourselves, we need to allocate that space
- * to remain ABI compliant since the callee may want to use that space.
- * We also allocate 2 more spaces for $r_ra and our return register (*to).
- *
- * n64 is a bit different. The *caller* will allocate the space to preserve
- * the arguments. So in 64-bit kernels, we allocate the 4-arg space for no
- * good reason but it does not matter that much really.
- *
- * (void *to) is returned in r_s0
- *
- */
-#ifdef CONFIG_CPU_LITTLE_ENDIAN
-#define DS_OFFSET(SIZE) (4 * SZREG)
-#else
-#define DS_OFFSET(SIZE) ((4 * SZREG) + (4 - SIZE))
-#endif
-#define bpf_slow_path_common(SIZE)				\
-	/* Quick check. Are we within reasonable boundaries? */ \
-	LONG_ADDIU	$r_s1, $r_skb_len, -SIZE;		\
-	sltu		$r_s0, offset, $r_s1;			\
-	beqz		$r_s0, fault;				\
-	/* Load 4th argument in DS */				\
-	 LONG_ADDIU	a3, zero, SIZE;				\
-	PTR_ADDIU	$r_sp, $r_sp, -(6 * SZREG);		\
-	PTR_LA		t0, skb_copy_bits;			\
-	PTR_S		$r_ra, (5 * SZREG)($r_sp);		\
-	/* Assign low slot to a2 */				\
-	PTR_ADDIU	a2, $r_sp, DS_OFFSET(SIZE);		\
-	jalr		t0;					\
-	/* Reset our destination slot (DS but it's ok) */	\
-	 INT_S		zero, (4 * SZREG)($r_sp);		\
-	/*							\
-	 * skb_copy_bits returns 0 on success and -EFAULT	\
-	 * on error. Our data live in a2. Do not bother with	\
-	 * our data if an error has been returned.		\
-	 */							\
-	/* Restore our frame */					\
-	PTR_L		$r_ra, (5 * SZREG)($r_sp);		\
-	INT_L		$r_s0, (4 * SZREG)($r_sp);		\
-	bltz		v0, fault;				\
-	 PTR_ADDIU	$r_sp, $r_sp, 6 * SZREG;		\
-	move		$r_ret, zero;				\
-
-NESTED(bpf_slow_path_word, (6 * SZREG), $r_sp)
-	bpf_slow_path_common(4)
-#ifdef CONFIG_CPU_LITTLE_ENDIAN
-# if MIPS_ISA_REV >= 2
-	wsbh	t0, $r_s0
-	jr	$r_ra
-	 rotr	$r_A, t0, 16
-# else
-	sll	t0, $r_s0, 24
-	srl	t1, $r_s0, 24
-	srl	t2, $r_s0, 8
-	or	t0, t0, t1
-	andi	t2, t2, 0xff00
-	andi	t1, $r_s0, 0xff00
-	or	t0, t0, t2
-	sll	t1, t1, 8
-	jr	$r_ra
-	 or	$r_A, t0, t1
-# endif
-#else
-	jr	$r_ra
-	 move	$r_A, $r_s0
-#endif
-
-	END(bpf_slow_path_word)
-
-NESTED(bpf_slow_path_half, (6 * SZREG), $r_sp)
-	bpf_slow_path_common(2)
-#ifdef CONFIG_CPU_LITTLE_ENDIAN
-# if MIPS_ISA_REV >= 2
-	jr	$r_ra
-	 wsbh	$r_A, $r_s0
-# else
-	sll	t0, $r_s0, 8
-	andi	t1, $r_s0, 0xff00
-	andi	t0, t0, 0xff00
-	srl	t1, t1, 8
-	jr	$r_ra
-	 or	$r_A, t0, t1
-# endif
-#else
-	jr	$r_ra
-	 move	$r_A, $r_s0
-#endif
-
-	END(bpf_slow_path_half)
-
-NESTED(bpf_slow_path_byte, (6 * SZREG), $r_sp)
-	bpf_slow_path_common(1)
-	jr	$r_ra
-	 move	$r_A, $r_s0
-
-	END(bpf_slow_path_byte)
-
-/*
- * Negative entry points
- */
-	.macro bpf_is_end_of_data
-	li	t0, SKF_LL_OFF
-	/* Reading link layer data? */
-	slt	t1, offset, t0
-	bgtz	t1, fault
-	/* Be careful what follows in DS. */
-	.endm
-/*
- * call skb_copy_bits:
- * (prototype in linux/filter.h)
- *
- * void *bpf_internal_load_pointer_neg_helper(const struct sk_buff *skb,
- *                                            int k, unsigned int size)
- *
- * see above (bpf_slow_path_common) for ABI restrictions
- */
-#define bpf_negative_common(SIZE)					\
-	PTR_ADDIU	$r_sp, $r_sp, -(6 * SZREG);			\
-	PTR_LA		t0, bpf_internal_load_pointer_neg_helper;	\
-	PTR_S		$r_ra, (5 * SZREG)($r_sp);			\
-	jalr		t0;						\
-	 li		a2, SIZE;					\
-	PTR_L		$r_ra, (5 * SZREG)($r_sp);			\
-	/* Check return pointer */					\
-	beqz		v0, fault;					\
-	 PTR_ADDIU	$r_sp, $r_sp, 6 * SZREG;			\
-	/* Preserve our pointer */					\
-	move		$r_s0, v0;					\
-	/* Set return value */						\
-	move		$r_ret, zero;					\
-
-bpf_slow_path_word_neg:
-	bpf_is_end_of_data
-NESTED(sk_load_word_negative, (6 * SZREG), $r_sp)
-	bpf_negative_common(4)
-	jr	$r_ra
-	 lw	$r_A, 0($r_s0)
-	END(sk_load_word_negative)
-
-bpf_slow_path_half_neg:
-	bpf_is_end_of_data
-NESTED(sk_load_half_negative, (6 * SZREG), $r_sp)
-	bpf_negative_common(2)
-	jr	$r_ra
-	 lhu	$r_A, 0($r_s0)
-	END(sk_load_half_negative)
-
-bpf_slow_path_byte_neg:
-	bpf_is_end_of_data
-NESTED(sk_load_byte_negative, (6 * SZREG), $r_sp)
-	bpf_negative_common(1)
-	jr	$r_ra
-	 lbu	$r_A, 0($r_s0)
-	END(sk_load_byte_negative)
-
-fault:
-	jr	$r_ra
-	 addiu $r_ret, zero, 1
diff --git a/arch/mips/net/ebpf_jit.c b/arch/mips/net/ebpf_jit.c
deleted file mode 100644
index 3a73e9375712..000000000000
--- a/arch/mips/net/ebpf_jit.c
+++ /dev/null
@@ -1,1938 +0,0 @@
-// SPDX-License-Identifier: GPL-2.0-only
-/*
- * Just-In-Time compiler for eBPF filters on MIPS
- *
- * Copyright (c) 2017 Cavium, Inc.
- *
- * Based on code from:
- *
- * Copyright (c) 2014 Imagination Technologies Ltd.
- * Author: Markos Chandras <markos.chandras@imgtec.com>
- */
-
-#include <linux/bitops.h>
-#include <linux/errno.h>
-#include <linux/filter.h>
-#include <linux/bpf.h>
-#include <linux/slab.h>
-#include <asm/bitops.h>
-#include <asm/byteorder.h>
-#include <asm/cacheflush.h>
-#include <asm/cpu-features.h>
-#include <asm/isa-rev.h>
-#include <asm/uasm.h>
-
-/* Registers used by JIT */
-#define MIPS_R_ZERO	0
-#define MIPS_R_AT	1
-#define MIPS_R_V0	2	/* BPF_R0 */
-#define MIPS_R_V1	3
-#define MIPS_R_A0	4	/* BPF_R1 */
-#define MIPS_R_A1	5	/* BPF_R2 */
-#define MIPS_R_A2	6	/* BPF_R3 */
-#define MIPS_R_A3	7	/* BPF_R4 */
-#define MIPS_R_A4	8	/* BPF_R5 */
-#define MIPS_R_T4	12	/* BPF_AX */
-#define MIPS_R_T5	13
-#define MIPS_R_T6	14
-#define MIPS_R_T7	15
-#define MIPS_R_S0	16	/* BPF_R6 */
-#define MIPS_R_S1	17	/* BPF_R7 */
-#define MIPS_R_S2	18	/* BPF_R8 */
-#define MIPS_R_S3	19	/* BPF_R9 */
-#define MIPS_R_S4	20	/* BPF_TCC */
-#define MIPS_R_S5	21
-#define MIPS_R_S6	22
-#define MIPS_R_S7	23
-#define MIPS_R_T8	24
-#define MIPS_R_T9	25
-#define MIPS_R_SP	29
-#define MIPS_R_RA	31
-
-/* eBPF flags */
-#define EBPF_SAVE_S0	BIT(0)
-#define EBPF_SAVE_S1	BIT(1)
-#define EBPF_SAVE_S2	BIT(2)
-#define EBPF_SAVE_S3	BIT(3)
-#define EBPF_SAVE_S4	BIT(4)
-#define EBPF_SAVE_RA	BIT(5)
-#define EBPF_SEEN_FP	BIT(6)
-#define EBPF_SEEN_TC	BIT(7)
-#define EBPF_TCC_IN_V1	BIT(8)
-
-/*
- * For the mips64 ISA, we need to track the value range or type for
- * each JIT register.  The BPF machine requires zero extended 32-bit
- * values, but the mips64 ISA requires sign extended 32-bit values.
- * At each point in the BPF program we track the state of every
- * register so that we can zero extend or sign extend as the BPF
- * semantics require.
- */
-enum reg_val_type {
-	/* uninitialized */
-	REG_UNKNOWN,
-	/* not known to be 32-bit compatible. */
-	REG_64BIT,
-	/* 32-bit compatible, no truncation needed for 64-bit ops. */
-	REG_64BIT_32BIT,
-	/* 32-bit compatible, need truncation for 64-bit ops. */
-	REG_32BIT,
-	/* 32-bit no sign/zero extension needed. */
-	REG_32BIT_POS
-};
-
-/*
- * high bit of offsets indicates if long branch conversion done at
- * this insn.
- */
-#define OFFSETS_B_CONV	BIT(31)
-
-/**
- * struct jit_ctx - JIT context
- * @skf:		The sk_filter
- * @stack_size:		eBPF stack size
- * @idx:		Instruction index
- * @flags:		JIT flags
- * @offsets:		Instruction offsets
- * @target:		Memory location for the compiled filter
- * @reg_val_types	Packed enum reg_val_type for each register.
- */
-struct jit_ctx {
-	const struct bpf_prog *skf;
-	int stack_size;
-	u32 idx;
-	u32 flags;
-	u32 *offsets;
-	u32 *target;
-	u64 *reg_val_types;
-	unsigned int long_b_conversion:1;
-	unsigned int gen_b_offsets:1;
-	unsigned int use_bbit_insns:1;
-};
-
-static void set_reg_val_type(u64 *rvt, int reg, enum reg_val_type type)
-{
-	*rvt &= ~(7ull << (reg * 3));
-	*rvt |= ((u64)type << (reg * 3));
-}
-
-static enum reg_val_type get_reg_val_type(const struct jit_ctx *ctx,
-					  int index, int reg)
-{
-	return (ctx->reg_val_types[index] >> (reg * 3)) & 7;
-}
-
-/* Simply emit the instruction if the JIT memory space has been allocated */
-#define emit_instr_long(ctx, func64, func32, ...)		\
-do {								\
-	if ((ctx)->target != NULL) {				\
-		u32 *p = &(ctx)->target[ctx->idx];		\
-		if (IS_ENABLED(CONFIG_64BIT))			\
-			uasm_i_##func64(&p, ##__VA_ARGS__);	\
-		else						\
-			uasm_i_##func32(&p, ##__VA_ARGS__);	\
-	}							\
-	(ctx)->idx++;						\
-} while (0)
-
-#define emit_instr(ctx, func, ...)				\
-	emit_instr_long(ctx, func, func, ##__VA_ARGS__)
-
-static unsigned int j_target(struct jit_ctx *ctx, int target_idx)
-{
-	unsigned long target_va, base_va;
-	unsigned int r;
-
-	if (!ctx->target)
-		return 0;
-
-	base_va = (unsigned long)ctx->target;
-	target_va = base_va + (ctx->offsets[target_idx] & ~OFFSETS_B_CONV);
-
-	if ((base_va & ~0x0ffffffful) != (target_va & ~0x0ffffffful))
-		return (unsigned int)-1;
-	r = target_va & 0x0ffffffful;
-	return r;
-}
-
-/* Compute the immediate value for PC-relative branches. */
-static u32 b_imm(unsigned int tgt, struct jit_ctx *ctx)
-{
-	if (!ctx->gen_b_offsets)
-		return 0;
-
-	/*
-	 * We want a pc-relative branch.  tgt is the instruction offset
-	 * we want to jump to.
-
-	 * Branch on MIPS:
-	 * I: target_offset <- sign_extend(offset)
-	 * I+1: PC += target_offset (delay slot)
-	 *
-	 * ctx->idx currently points to the branch instruction
-	 * but the offset is added to the delay slot so we need
-	 * to subtract 4.
-	 */
-	return (ctx->offsets[tgt] & ~OFFSETS_B_CONV) -
-		(ctx->idx * 4) - 4;
-}
-
-enum which_ebpf_reg {
-	src_reg,
-	src_reg_no_fp,
-	dst_reg,
-	dst_reg_fp_ok
-};
-
-/*
- * For eBPF, the register mapping naturally falls out of the
- * requirements of eBPF and the MIPS n64 ABI.  We don't maintain a
- * separate frame pointer, so BPF_REG_10 relative accesses are
- * adjusted to be $sp relative.
- */
-static int ebpf_to_mips_reg(struct jit_ctx *ctx,
-			    const struct bpf_insn *insn,
-			    enum which_ebpf_reg w)
-{
-	int ebpf_reg = (w == src_reg || w == src_reg_no_fp) ?
-		insn->src_reg : insn->dst_reg;
-
-	switch (ebpf_reg) {
-	case BPF_REG_0:
-		return MIPS_R_V0;
-	case BPF_REG_1:
-		return MIPS_R_A0;
-	case BPF_REG_2:
-		return MIPS_R_A1;
-	case BPF_REG_3:
-		return MIPS_R_A2;
-	case BPF_REG_4:
-		return MIPS_R_A3;
-	case BPF_REG_5:
-		return MIPS_R_A4;
-	case BPF_REG_6:
-		ctx->flags |= EBPF_SAVE_S0;
-		return MIPS_R_S0;
-	case BPF_REG_7:
-		ctx->flags |= EBPF_SAVE_S1;
-		return MIPS_R_S1;
-	case BPF_REG_8:
-		ctx->flags |= EBPF_SAVE_S2;
-		return MIPS_R_S2;
-	case BPF_REG_9:
-		ctx->flags |= EBPF_SAVE_S3;
-		return MIPS_R_S3;
-	case BPF_REG_10:
-		if (w == dst_reg || w == src_reg_no_fp)
-			goto bad_reg;
-		ctx->flags |= EBPF_SEEN_FP;
-		/*
-		 * Needs special handling, return something that
-		 * cannot be clobbered just in case.
-		 */
-		return MIPS_R_ZERO;
-	case BPF_REG_AX:
-		return MIPS_R_T4;
-	default:
-bad_reg:
-		WARN(1, "Illegal bpf reg: %d\n", ebpf_reg);
-		return -EINVAL;
-	}
-}
-/*
- * eBPF stack frame will be something like:
- *
- *  Entry $sp ------>   +--------------------------------+
- *                      |   $ra  (optional)              |
- *                      +--------------------------------+
- *                      |   $s0  (optional)              |
- *                      +--------------------------------+
- *                      |   $s1  (optional)              |
- *                      +--------------------------------+
- *                      |   $s2  (optional)              |
- *                      +--------------------------------+
- *                      |   $s3  (optional)              |
- *                      +--------------------------------+
- *                      |   $s4  (optional)              |
- *                      +--------------------------------+
- *                      |   tmp-storage  (if $ra saved)  |
- * $sp + tmp_offset --> +--------------------------------+ <--BPF_REG_10
- *                      |   BPF_REG_10 relative storage  |
- *                      |    MAX_BPF_STACK (optional)    |
- *                      |      .                         |
- *                      |      .                         |
- *                      |      .                         |
- *     $sp -------->    +--------------------------------+
- *
- * If BPF_REG_10 is never referenced, then the MAX_BPF_STACK sized
- * area is not allocated.
- */
-static int gen_int_prologue(struct jit_ctx *ctx)
-{
-	int stack_adjust = 0;
-	int store_offset;
-	int locals_size;
-
-	if (ctx->flags & EBPF_SAVE_RA)
-		/*
-		 * If RA we are doing a function call and may need
-		 * extra 8-byte tmp area.
-		 */
-		stack_adjust += 2 * sizeof(long);
-	if (ctx->flags & EBPF_SAVE_S0)
-		stack_adjust += sizeof(long);
-	if (ctx->flags & EBPF_SAVE_S1)
-		stack_adjust += sizeof(long);
-	if (ctx->flags & EBPF_SAVE_S2)
-		stack_adjust += sizeof(long);
-	if (ctx->flags & EBPF_SAVE_S3)
-		stack_adjust += sizeof(long);
-	if (ctx->flags & EBPF_SAVE_S4)
-		stack_adjust += sizeof(long);
-
-	BUILD_BUG_ON(MAX_BPF_STACK & 7);
-	locals_size = (ctx->flags & EBPF_SEEN_FP) ? MAX_BPF_STACK : 0;
-
-	stack_adjust += locals_size;
-
-	ctx->stack_size = stack_adjust;
-
-	/*
-	 * First instruction initializes the tail call count (TCC).
-	 * On tail call we skip this instruction, and the TCC is
-	 * passed in $v1 from the caller.
-	 */
-	emit_instr(ctx, addiu, MIPS_R_V1, MIPS_R_ZERO, MAX_TAIL_CALL_CNT);
-	if (stack_adjust)
-		emit_instr_long(ctx, daddiu, addiu,
-					MIPS_R_SP, MIPS_R_SP, -stack_adjust);
-	else
-		return 0;
-
-	store_offset = stack_adjust - sizeof(long);
-
-	if (ctx->flags & EBPF_SAVE_RA) {
-		emit_instr_long(ctx, sd, sw,
-					MIPS_R_RA, store_offset, MIPS_R_SP);
-		store_offset -= sizeof(long);
-	}
-	if (ctx->flags & EBPF_SAVE_S0) {
-		emit_instr_long(ctx, sd, sw,
-					MIPS_R_S0, store_offset, MIPS_R_SP);
-		store_offset -= sizeof(long);
-	}
-	if (ctx->flags & EBPF_SAVE_S1) {
-		emit_instr_long(ctx, sd, sw,
-					MIPS_R_S1, store_offset, MIPS_R_SP);
-		store_offset -= sizeof(long);
-	}
-	if (ctx->flags & EBPF_SAVE_S2) {
-		emit_instr_long(ctx, sd, sw,
-					MIPS_R_S2, store_offset, MIPS_R_SP);
-		store_offset -= sizeof(long);
-	}
-	if (ctx->flags & EBPF_SAVE_S3) {
-		emit_instr_long(ctx, sd, sw,
-					MIPS_R_S3, store_offset, MIPS_R_SP);
-		store_offset -= sizeof(long);
-	}
-	if (ctx->flags & EBPF_SAVE_S4) {
-		emit_instr_long(ctx, sd, sw,
-					MIPS_R_S4, store_offset, MIPS_R_SP);
-		store_offset -= sizeof(long);
-	}
-
-	if ((ctx->flags & EBPF_SEEN_TC) && !(ctx->flags & EBPF_TCC_IN_V1))
-		emit_instr_long(ctx, daddu, addu,
-					MIPS_R_S4, MIPS_R_V1, MIPS_R_ZERO);
-
-	return 0;
-}
-
-static int build_int_epilogue(struct jit_ctx *ctx, int dest_reg)
-{
-	const struct bpf_prog *prog = ctx->skf;
-	int stack_adjust = ctx->stack_size;
-	int store_offset = stack_adjust - sizeof(long);
-	enum reg_val_type td;
-	int r0 = MIPS_R_V0;
-
-	if (dest_reg == MIPS_R_RA) {
-		/* Don't let zero extended value escape. */
-		td = get_reg_val_type(ctx, prog->len, BPF_REG_0);
-		if (td == REG_64BIT)
-			emit_instr(ctx, sll, r0, r0, 0);
-	}
-
-	if (ctx->flags & EBPF_SAVE_RA) {
-		emit_instr_long(ctx, ld, lw,
-					MIPS_R_RA, store_offset, MIPS_R_SP);
-		store_offset -= sizeof(long);
-	}
-	if (ctx->flags & EBPF_SAVE_S0) {
-		emit_instr_long(ctx, ld, lw,
-					MIPS_R_S0, store_offset, MIPS_R_SP);
-		store_offset -= sizeof(long);
-	}
-	if (ctx->flags & EBPF_SAVE_S1) {
-		emit_instr_long(ctx, ld, lw,
-					MIPS_R_S1, store_offset, MIPS_R_SP);
-		store_offset -= sizeof(long);
-	}
-	if (ctx->flags & EBPF_SAVE_S2) {
-		emit_instr_long(ctx, ld, lw,
-				MIPS_R_S2, store_offset, MIPS_R_SP);
-		store_offset -= sizeof(long);
-	}
-	if (ctx->flags & EBPF_SAVE_S3) {
-		emit_instr_long(ctx, ld, lw,
-					MIPS_R_S3, store_offset, MIPS_R_SP);
-		store_offset -= sizeof(long);
-	}
-	if (ctx->flags & EBPF_SAVE_S4) {
-		emit_instr_long(ctx, ld, lw,
-					MIPS_R_S4, store_offset, MIPS_R_SP);
-		store_offset -= sizeof(long);
-	}
-	emit_instr(ctx, jr, dest_reg);
-
-	if (stack_adjust)
-		emit_instr_long(ctx, daddiu, addiu,
-					MIPS_R_SP, MIPS_R_SP, stack_adjust);
-	else
-		emit_instr(ctx, nop);
-
-	return 0;
-}
-
-static void gen_imm_to_reg(const struct bpf_insn *insn, int reg,
-			   struct jit_ctx *ctx)
-{
-	if (insn->imm >= S16_MIN && insn->imm <= S16_MAX) {
-		emit_instr(ctx, addiu, reg, MIPS_R_ZERO, insn->imm);
-	} else {
-		int lower = (s16)(insn->imm & 0xffff);
-		int upper = insn->imm - lower;
-
-		emit_instr(ctx, lui, reg, upper >> 16);
-		emit_instr(ctx, addiu, reg, reg, lower);
-	}
-}
-
-static int gen_imm_insn(const struct bpf_insn *insn, struct jit_ctx *ctx,
-			int idx)
-{
-	int upper_bound, lower_bound;
-	int dst = ebpf_to_mips_reg(ctx, insn, dst_reg);
-
-	if (dst < 0)
-		return dst;
-
-	switch (BPF_OP(insn->code)) {
-	case BPF_MOV:
-	case BPF_ADD:
-		upper_bound = S16_MAX;
-		lower_bound = S16_MIN;
-		break;
-	case BPF_SUB:
-		upper_bound = -(int)S16_MIN;
-		lower_bound = -(int)S16_MAX;
-		break;
-	case BPF_AND:
-	case BPF_OR:
-	case BPF_XOR:
-		upper_bound = 0xffff;
-		lower_bound = 0;
-		break;
-	case BPF_RSH:
-	case BPF_LSH:
-	case BPF_ARSH:
-		/* Shift amounts are truncated, no need for bounds */
-		upper_bound = S32_MAX;
-		lower_bound = S32_MIN;
-		break;
-	default:
-		return -EINVAL;
-	}
-
-	/*
-	 * Immediate move clobbers the register, so no sign/zero
-	 * extension needed.
-	 */
-	if (BPF_CLASS(insn->code) == BPF_ALU64 &&
-	    BPF_OP(insn->code) != BPF_MOV &&
-	    get_reg_val_type(ctx, idx, insn->dst_reg) == REG_32BIT)
-		emit_instr(ctx, dinsu, dst, MIPS_R_ZERO, 32, 32);
-	/* BPF_ALU | BPF_LSH doesn't need separate sign extension */
-	if (BPF_CLASS(insn->code) == BPF_ALU &&
-	    BPF_OP(insn->code) != BPF_LSH &&
-	    BPF_OP(insn->code) != BPF_MOV &&
-	    get_reg_val_type(ctx, idx, insn->dst_reg) != REG_32BIT)
-		emit_instr(ctx, sll, dst, dst, 0);
-
-	if (insn->imm >= lower_bound && insn->imm <= upper_bound) {
-		/* single insn immediate case */
-		switch (BPF_OP(insn->code) | BPF_CLASS(insn->code)) {
-		case BPF_ALU64 | BPF_MOV:
-			emit_instr(ctx, daddiu, dst, MIPS_R_ZERO, insn->imm);
-			break;
-		case BPF_ALU64 | BPF_AND:
-		case BPF_ALU | BPF_AND:
-			emit_instr(ctx, andi, dst, dst, insn->imm);
-			break;
-		case BPF_ALU64 | BPF_OR:
-		case BPF_ALU | BPF_OR:
-			emit_instr(ctx, ori, dst, dst, insn->imm);
-			break;
-		case BPF_ALU64 | BPF_XOR:
-		case BPF_ALU | BPF_XOR:
-			emit_instr(ctx, xori, dst, dst, insn->imm);
-			break;
-		case BPF_ALU64 | BPF_ADD:
-			emit_instr(ctx, daddiu, dst, dst, insn->imm);
-			break;
-		case BPF_ALU64 | BPF_SUB:
-			emit_instr(ctx, daddiu, dst, dst, -insn->imm);
-			break;
-		case BPF_ALU64 | BPF_RSH:
-			emit_instr(ctx, dsrl_safe, dst, dst, insn->imm & 0x3f);
-			break;
-		case BPF_ALU | BPF_RSH:
-			emit_instr(ctx, srl, dst, dst, insn->imm & 0x1f);
-			break;
-		case BPF_ALU64 | BPF_LSH:
-			emit_instr(ctx, dsll_safe, dst, dst, insn->imm & 0x3f);
-			break;
-		case BPF_ALU | BPF_LSH:
-			emit_instr(ctx, sll, dst, dst, insn->imm & 0x1f);
-			break;
-		case BPF_ALU64 | BPF_ARSH:
-			emit_instr(ctx, dsra_safe, dst, dst, insn->imm & 0x3f);
-			break;
-		case BPF_ALU | BPF_ARSH:
-			emit_instr(ctx, sra, dst, dst, insn->imm & 0x1f);
-			break;
-		case BPF_ALU | BPF_MOV:
-			emit_instr(ctx, addiu, dst, MIPS_R_ZERO, insn->imm);
-			break;
-		case BPF_ALU | BPF_ADD:
-			emit_instr(ctx, addiu, dst, dst, insn->imm);
-			break;
-		case BPF_ALU | BPF_SUB:
-			emit_instr(ctx, addiu, dst, dst, -insn->imm);
-			break;
-		default:
-			return -EINVAL;
-		}
-	} else {
-		/* multi insn immediate case */
-		if (BPF_OP(insn->code) == BPF_MOV) {
-			gen_imm_to_reg(insn, dst, ctx);
-		} else {
-			gen_imm_to_reg(insn, MIPS_R_AT, ctx);
-			switch (BPF_OP(insn->code) | BPF_CLASS(insn->code)) {
-			case BPF_ALU64 | BPF_AND:
-			case BPF_ALU | BPF_AND:
-				emit_instr(ctx, and, dst, dst, MIPS_R_AT);
-				break;
-			case BPF_ALU64 | BPF_OR:
-			case BPF_ALU | BPF_OR:
-				emit_instr(ctx, or, dst, dst, MIPS_R_AT);
-				break;
-			case BPF_ALU64 | BPF_XOR:
-			case BPF_ALU | BPF_XOR:
-				emit_instr(ctx, xor, dst, dst, MIPS_R_AT);
-				break;
-			case BPF_ALU64 | BPF_ADD:
-				emit_instr(ctx, daddu, dst, dst, MIPS_R_AT);
-				break;
-			case BPF_ALU64 | BPF_SUB:
-				emit_instr(ctx, dsubu, dst, dst, MIPS_R_AT);
-				break;
-			case BPF_ALU | BPF_ADD:
-				emit_instr(ctx, addu, dst, dst, MIPS_R_AT);
-				break;
-			case BPF_ALU | BPF_SUB:
-				emit_instr(ctx, subu, dst, dst, MIPS_R_AT);
-				break;
-			default:
-				return -EINVAL;
-			}
-		}
-	}
-
-	return 0;
-}
-
-static void emit_const_to_reg(struct jit_ctx *ctx, int dst, u64 value)
-{
-	if (value >= 0xffffffffffff8000ull || value < 0x8000ull) {
-		emit_instr(ctx, daddiu, dst, MIPS_R_ZERO, (int)value);
-	} else if (value >= 0xffffffff80000000ull ||
-		   (value < 0x80000000 && value > 0xffff)) {
-		emit_instr(ctx, lui, dst, (s32)(s16)(value >> 16));
-		emit_instr(ctx, ori, dst, dst, (unsigned int)(value & 0xffff));
-	} else {
-		int i;
-		bool seen_part = false;
-		int needed_shift = 0;
-
-		for (i = 0; i < 4; i++) {
-			u64 part = (value >> (16 * (3 - i))) & 0xffff;
-
-			if (seen_part && needed_shift > 0 && (part || i == 3)) {
-				emit_instr(ctx, dsll_safe, dst, dst, needed_shift);
-				needed_shift = 0;
-			}
-			if (part) {
-				if (i == 0 || (!seen_part && i < 3 && part < 0x8000)) {
-					emit_instr(ctx, lui, dst, (s32)(s16)part);
-					needed_shift = -16;
-				} else {
-					emit_instr(ctx, ori, dst,
-						   seen_part ? dst : MIPS_R_ZERO,
-						   (unsigned int)part);
-				}
-				seen_part = true;
-			}
-			if (seen_part)
-				needed_shift += 16;
-		}
-	}
-}
-
-static int emit_bpf_tail_call(struct jit_ctx *ctx, int this_idx)
-{
-	int off, b_off;
-	int tcc_reg;
-
-	ctx->flags |= EBPF_SEEN_TC;
-	/*
-	 * if (index >= array->map.max_entries)
-	 *     goto out;
-	 */
-	off = offsetof(struct bpf_array, map.max_entries);
-	emit_instr(ctx, lwu, MIPS_R_T5, off, MIPS_R_A1);
-	emit_instr(ctx, sltu, MIPS_R_AT, MIPS_R_T5, MIPS_R_A2);
-	b_off = b_imm(this_idx + 1, ctx);
-	emit_instr(ctx, bne, MIPS_R_AT, MIPS_R_ZERO, b_off);
-	/*
-	 * if (TCC-- < 0)
-	 *     goto out;
-	 */
-	/* Delay slot */
-	tcc_reg = (ctx->flags & EBPF_TCC_IN_V1) ? MIPS_R_V1 : MIPS_R_S4;
-	emit_instr(ctx, daddiu, MIPS_R_T5, tcc_reg, -1);
-	b_off = b_imm(this_idx + 1, ctx);
-	emit_instr(ctx, bltz, tcc_reg, b_off);
-	/*
-	 * prog = array->ptrs[index];
-	 * if (prog == NULL)
-	 *     goto out;
-	 */
-	/* Delay slot */
-	emit_instr(ctx, dsll, MIPS_R_T8, MIPS_R_A2, 3);
-	emit_instr(ctx, daddu, MIPS_R_T8, MIPS_R_T8, MIPS_R_A1);
-	off = offsetof(struct bpf_array, ptrs);
-	emit_instr(ctx, ld, MIPS_R_AT, off, MIPS_R_T8);
-	b_off = b_imm(this_idx + 1, ctx);
-	emit_instr(ctx, beq, MIPS_R_AT, MIPS_R_ZERO, b_off);
-	/* Delay slot */
-	emit_instr(ctx, nop);
-
-	/* goto *(prog->bpf_func + 4); */
-	off = offsetof(struct bpf_prog, bpf_func);
-	emit_instr(ctx, ld, MIPS_R_T9, off, MIPS_R_AT);
-	/* All systems are go... propagate TCC */
-	emit_instr(ctx, daddu, MIPS_R_V1, MIPS_R_T5, MIPS_R_ZERO);
-	/* Skip first instruction (TCC initialization) */
-	emit_instr(ctx, daddiu, MIPS_R_T9, MIPS_R_T9, 4);
-	return build_int_epilogue(ctx, MIPS_R_T9);
-}
-
-static bool is_bad_offset(int b_off)
-{
-	return b_off > 0x1ffff || b_off < -0x20000;
-}
-
-/* Returns the number of insn slots consumed. */
-static int build_one_insn(const struct bpf_insn *insn, struct jit_ctx *ctx,
-			  int this_idx, int exit_idx)
-{
-	int src, dst, r, td, ts, mem_off, b_off;
-	bool need_swap, did_move, cmp_eq;
-	unsigned int target = 0;
-	u64 t64;
-	s64 t64s;
-	int bpf_op = BPF_OP(insn->code);
-
-	if (IS_ENABLED(CONFIG_32BIT) && ((BPF_CLASS(insn->code) == BPF_ALU64)
-						|| (bpf_op == BPF_DW)))
-		return -EINVAL;
-
-	switch (insn->code) {
-	case BPF_ALU64 | BPF_ADD | BPF_K: /* ALU64_IMM */
-	case BPF_ALU64 | BPF_SUB | BPF_K: /* ALU64_IMM */
-	case BPF_ALU64 | BPF_OR | BPF_K: /* ALU64_IMM */
-	case BPF_ALU64 | BPF_AND | BPF_K: /* ALU64_IMM */
-	case BPF_ALU64 | BPF_LSH | BPF_K: /* ALU64_IMM */
-	case BPF_ALU64 | BPF_RSH | BPF_K: /* ALU64_IMM */
-	case BPF_ALU64 | BPF_XOR | BPF_K: /* ALU64_IMM */
-	case BPF_ALU64 | BPF_ARSH | BPF_K: /* ALU64_IMM */
-	case BPF_ALU64 | BPF_MOV | BPF_K: /* ALU64_IMM */
-	case BPF_ALU | BPF_MOV | BPF_K: /* ALU32_IMM */
-	case BPF_ALU | BPF_ADD | BPF_K: /* ALU32_IMM */
-	case BPF_ALU | BPF_SUB | BPF_K: /* ALU32_IMM */
-	case BPF_ALU | BPF_OR | BPF_K: /* ALU64_IMM */
-	case BPF_ALU | BPF_AND | BPF_K: /* ALU64_IMM */
-	case BPF_ALU | BPF_LSH | BPF_K: /* ALU64_IMM */
-	case BPF_ALU | BPF_RSH | BPF_K: /* ALU64_IMM */
-	case BPF_ALU | BPF_XOR | BPF_K: /* ALU64_IMM */
-	case BPF_ALU | BPF_ARSH | BPF_K: /* ALU64_IMM */
-		r = gen_imm_insn(insn, ctx, this_idx);
-		if (r < 0)
-			return r;
-		break;
-	case BPF_ALU64 | BPF_MUL | BPF_K: /* ALU64_IMM */
-		dst = ebpf_to_mips_reg(ctx, insn, dst_reg);
-		if (dst < 0)
-			return dst;
-		if (get_reg_val_type(ctx, this_idx, insn->dst_reg) == REG_32BIT)
-			emit_instr(ctx, dinsu, dst, MIPS_R_ZERO, 32, 32);
-		if (insn->imm == 1) /* Mult by 1 is a nop */
-			break;
-		gen_imm_to_reg(insn, MIPS_R_AT, ctx);
-		if (MIPS_ISA_REV >= 6) {
-			emit_instr(ctx, dmulu, dst, dst, MIPS_R_AT);
-		} else {
-			emit_instr(ctx, dmultu, MIPS_R_AT, dst);
-			emit_instr(ctx, mflo, dst);
-		}
-		break;
-	case BPF_ALU64 | BPF_NEG | BPF_K: /* ALU64_IMM */
-		dst = ebpf_to_mips_reg(ctx, insn, dst_reg);
-		if (dst < 0)
-			return dst;
-		if (get_reg_val_type(ctx, this_idx, insn->dst_reg) == REG_32BIT)
-			emit_instr(ctx, dinsu, dst, MIPS_R_ZERO, 32, 32);
-		emit_instr(ctx, dsubu, dst, MIPS_R_ZERO, dst);
-		break;
-	case BPF_ALU | BPF_MUL | BPF_K: /* ALU_IMM */
-		dst = ebpf_to_mips_reg(ctx, insn, dst_reg);
-		if (dst < 0)
-			return dst;
-		td = get_reg_val_type(ctx, this_idx, insn->dst_reg);
-		if (td == REG_64BIT) {
-			/* sign extend */
-			emit_instr(ctx, sll, dst, dst, 0);
-		}
-		if (insn->imm == 1) /* Mult by 1 is a nop */
-			break;
-		gen_imm_to_reg(insn, MIPS_R_AT, ctx);
-		if (MIPS_ISA_REV >= 6) {
-			emit_instr(ctx, mulu, dst, dst, MIPS_R_AT);
-		} else {
-			emit_instr(ctx, multu, dst, MIPS_R_AT);
-			emit_instr(ctx, mflo, dst);
-		}
-		break;
-	case BPF_ALU | BPF_NEG | BPF_K: /* ALU_IMM */
-		dst = ebpf_to_mips_reg(ctx, insn, dst_reg);
-		if (dst < 0)
-			return dst;
-		td = get_reg_val_type(ctx, this_idx, insn->dst_reg);
-		if (td == REG_64BIT) {
-			/* sign extend */
-			emit_instr(ctx, sll, dst, dst, 0);
-		}
-		emit_instr(ctx, subu, dst, MIPS_R_ZERO, dst);
-		break;
-	case BPF_ALU | BPF_DIV | BPF_K: /* ALU_IMM */
-	case BPF_ALU | BPF_MOD | BPF_K: /* ALU_IMM */
-		if (insn->imm == 0)
-			return -EINVAL;
-		dst = ebpf_to_mips_reg(ctx, insn, dst_reg);
-		if (dst < 0)
-			return dst;
-		td = get_reg_val_type(ctx, this_idx, insn->dst_reg);
-		if (td == REG_64BIT)
-			/* sign extend */
-			emit_instr(ctx, sll, dst, dst, 0);
-		if (insn->imm == 1) {
-			/* div by 1 is a nop, mod by 1 is zero */
-			if (bpf_op == BPF_MOD)
-				emit_instr(ctx, addu, dst, MIPS_R_ZERO, MIPS_R_ZERO);
-			break;
-		}
-		gen_imm_to_reg(insn, MIPS_R_AT, ctx);
-		if (MIPS_ISA_REV >= 6) {
-			if (bpf_op == BPF_DIV)
-				emit_instr(ctx, divu_r6, dst, dst, MIPS_R_AT);
-			else
-				emit_instr(ctx, modu, dst, dst, MIPS_R_AT);
-			break;
-		}
-		emit_instr(ctx, divu, dst, MIPS_R_AT);
-		if (bpf_op == BPF_DIV)
-			emit_instr(ctx, mflo, dst);
-		else
-			emit_instr(ctx, mfhi, dst);
-		break;
-	case BPF_ALU64 | BPF_DIV | BPF_K: /* ALU_IMM */
-	case BPF_ALU64 | BPF_MOD | BPF_K: /* ALU_IMM */
-		if (insn->imm == 0)
-			return -EINVAL;
-		dst = ebpf_to_mips_reg(ctx, insn, dst_reg);
-		if (dst < 0)
-			return dst;
-		if (get_reg_val_type(ctx, this_idx, insn->dst_reg) == REG_32BIT)
-			emit_instr(ctx, dinsu, dst, MIPS_R_ZERO, 32, 32);
-		if (insn->imm == 1) {
-			/* div by 1 is a nop, mod by 1 is zero */
-			if (bpf_op == BPF_MOD)
-				emit_instr(ctx, addu, dst, MIPS_R_ZERO, MIPS_R_ZERO);
-			break;
-		}
-		gen_imm_to_reg(insn, MIPS_R_AT, ctx);
-		if (MIPS_ISA_REV >= 6) {
-			if (bpf_op == BPF_DIV)
-				emit_instr(ctx, ddivu_r6, dst, dst, MIPS_R_AT);
-			else
-				emit_instr(ctx, modu, dst, dst, MIPS_R_AT);
-			break;
-		}
-		emit_instr(ctx, ddivu, dst, MIPS_R_AT);
-		if (bpf_op == BPF_DIV)
-			emit_instr(ctx, mflo, dst);
-		else
-			emit_instr(ctx, mfhi, dst);
-		break;
-	case BPF_ALU64 | BPF_MOV | BPF_X: /* ALU64_REG */
-	case BPF_ALU64 | BPF_ADD | BPF_X: /* ALU64_REG */
-	case BPF_ALU64 | BPF_SUB | BPF_X: /* ALU64_REG */
-	case BPF_ALU64 | BPF_XOR | BPF_X: /* ALU64_REG */
-	case BPF_ALU64 | BPF_OR | BPF_X: /* ALU64_REG */
-	case BPF_ALU64 | BPF_AND | BPF_X: /* ALU64_REG */
-	case BPF_ALU64 | BPF_MUL | BPF_X: /* ALU64_REG */
-	case BPF_ALU64 | BPF_DIV | BPF_X: /* ALU64_REG */
-	case BPF_ALU64 | BPF_MOD | BPF_X: /* ALU64_REG */
-	case BPF_ALU64 | BPF_LSH | BPF_X: /* ALU64_REG */
-	case BPF_ALU64 | BPF_RSH | BPF_X: /* ALU64_REG */
-	case BPF_ALU64 | BPF_ARSH | BPF_X: /* ALU64_REG */
-		src = ebpf_to_mips_reg(ctx, insn, src_reg);
-		dst = ebpf_to_mips_reg(ctx, insn, dst_reg);
-		if (src < 0 || dst < 0)
-			return -EINVAL;
-		if (get_reg_val_type(ctx, this_idx, insn->dst_reg) == REG_32BIT)
-			emit_instr(ctx, dinsu, dst, MIPS_R_ZERO, 32, 32);
-		did_move = false;
-		if (insn->src_reg == BPF_REG_10) {
-			if (bpf_op == BPF_MOV) {
-				emit_instr(ctx, daddiu, dst, MIPS_R_SP, MAX_BPF_STACK);
-				did_move = true;
-			} else {
-				emit_instr(ctx, daddiu, MIPS_R_AT, MIPS_R_SP, MAX_BPF_STACK);
-				src = MIPS_R_AT;
-			}
-		} else if (get_reg_val_type(ctx, this_idx, insn->src_reg) == REG_32BIT) {
-			int tmp_reg = MIPS_R_AT;
-
-			if (bpf_op == BPF_MOV) {
-				tmp_reg = dst;
-				did_move = true;
-			}
-			emit_instr(ctx, daddu, tmp_reg, src, MIPS_R_ZERO);
-			emit_instr(ctx, dinsu, tmp_reg, MIPS_R_ZERO, 32, 32);
-			src = MIPS_R_AT;
-		}
-		switch (bpf_op) {
-		case BPF_MOV:
-			if (!did_move)
-				emit_instr(ctx, daddu, dst, src, MIPS_R_ZERO);
-			break;
-		case BPF_ADD:
-			emit_instr(ctx, daddu, dst, dst, src);
-			break;
-		case BPF_SUB:
-			emit_instr(ctx, dsubu, dst, dst, src);
-			break;
-		case BPF_XOR:
-			emit_instr(ctx, xor, dst, dst, src);
-			break;
-		case BPF_OR:
-			emit_instr(ctx, or, dst, dst, src);
-			break;
-		case BPF_AND:
-			emit_instr(ctx, and, dst, dst, src);
-			break;
-		case BPF_MUL:
-			if (MIPS_ISA_REV >= 6) {
-				emit_instr(ctx, dmulu, dst, dst, src);
-			} else {
-				emit_instr(ctx, dmultu, dst, src);
-				emit_instr(ctx, mflo, dst);
-			}
-			break;
-		case BPF_DIV:
-		case BPF_MOD:
-			if (MIPS_ISA_REV >= 6) {
-				if (bpf_op == BPF_DIV)
-					emit_instr(ctx, ddivu_r6,
-							dst, dst, src);
-				else
-					emit_instr(ctx, modu, dst, dst, src);
-				break;
-			}
-			emit_instr(ctx, ddivu, dst, src);
-			if (bpf_op == BPF_DIV)
-				emit_instr(ctx, mflo, dst);
-			else
-				emit_instr(ctx, mfhi, dst);
-			break;
-		case BPF_LSH:
-			emit_instr(ctx, dsllv, dst, dst, src);
-			break;
-		case BPF_RSH:
-			emit_instr(ctx, dsrlv, dst, dst, src);
-			break;
-		case BPF_ARSH:
-			emit_instr(ctx, dsrav, dst, dst, src);
-			break;
-		default:
-			pr_err("ALU64_REG NOT HANDLED\n");
-			return -EINVAL;
-		}
-		break;
-	case BPF_ALU | BPF_MOV | BPF_X: /* ALU_REG */
-	case BPF_ALU | BPF_ADD | BPF_X: /* ALU_REG */
-	case BPF_ALU | BPF_SUB | BPF_X: /* ALU_REG */
-	case BPF_ALU | BPF_XOR | BPF_X: /* ALU_REG */
-	case BPF_ALU | BPF_OR | BPF_X: /* ALU_REG */
-	case BPF_ALU | BPF_AND | BPF_X: /* ALU_REG */
-	case BPF_ALU | BPF_MUL | BPF_X: /* ALU_REG */
-	case BPF_ALU | BPF_DIV | BPF_X: /* ALU_REG */
-	case BPF_ALU | BPF_MOD | BPF_X: /* ALU_REG */
-	case BPF_ALU | BPF_LSH | BPF_X: /* ALU_REG */
-	case BPF_ALU | BPF_RSH | BPF_X: /* ALU_REG */
-	case BPF_ALU | BPF_ARSH | BPF_X: /* ALU_REG */
-		src = ebpf_to_mips_reg(ctx, insn, src_reg_no_fp);
-		dst = ebpf_to_mips_reg(ctx, insn, dst_reg);
-		if (src < 0 || dst < 0)
-			return -EINVAL;
-		td = get_reg_val_type(ctx, this_idx, insn->dst_reg);
-		if (td == REG_64BIT) {
-			/* sign extend */
-			emit_instr(ctx, sll, dst, dst, 0);
-		}
-		did_move = false;
-		ts = get_reg_val_type(ctx, this_idx, insn->src_reg);
-		if (ts == REG_64BIT) {
-			int tmp_reg = MIPS_R_AT;
-
-			if (bpf_op == BPF_MOV) {
-				tmp_reg = dst;
-				did_move = true;
-			}
-			/* sign extend */
-			emit_instr(ctx, sll, tmp_reg, src, 0);
-			src = MIPS_R_AT;
-		}
-		switch (bpf_op) {
-		case BPF_MOV:
-			if (!did_move)
-				emit_instr(ctx, addu, dst, src, MIPS_R_ZERO);
-			break;
-		case BPF_ADD:
-			emit_instr(ctx, addu, dst, dst, src);
-			break;
-		case BPF_SUB:
-			emit_instr(ctx, subu, dst, dst, src);
-			break;
-		case BPF_XOR:
-			emit_instr(ctx, xor, dst, dst, src);
-			break;
-		case BPF_OR:
-			emit_instr(ctx, or, dst, dst, src);
-			break;
-		case BPF_AND:
-			emit_instr(ctx, and, dst, dst, src);
-			break;
-		case BPF_MUL:
-			emit_instr(ctx, mul, dst, dst, src);
-			break;
-		case BPF_DIV:
-		case BPF_MOD:
-			if (MIPS_ISA_REV >= 6) {
-				if (bpf_op == BPF_DIV)
-					emit_instr(ctx, divu_r6, dst, dst, src);
-				else
-					emit_instr(ctx, modu, dst, dst, src);
-				break;
-			}
-			emit_instr(ctx, divu, dst, src);
-			if (bpf_op == BPF_DIV)
-				emit_instr(ctx, mflo, dst);
-			else
-				emit_instr(ctx, mfhi, dst);
-			break;
-		case BPF_LSH:
-			emit_instr(ctx, sllv, dst, dst, src);
-			break;
-		case BPF_RSH:
-			emit_instr(ctx, srlv, dst, dst, src);
-			break;
-		case BPF_ARSH:
-			emit_instr(ctx, srav, dst, dst, src);
-			break;
-		default:
-			pr_err("ALU_REG NOT HANDLED\n");
-			return -EINVAL;
-		}
-		break;
-	case BPF_JMP | BPF_EXIT:
-		if (this_idx + 1 < exit_idx) {
-			b_off = b_imm(exit_idx, ctx);
-			if (is_bad_offset(b_off))
-				return -E2BIG;
-			emit_instr(ctx, beq, MIPS_R_ZERO, MIPS_R_ZERO, b_off);
-			emit_instr(ctx, nop);
-		}
-		break;
-	case BPF_JMP | BPF_JEQ | BPF_K: /* JMP_IMM */
-	case BPF_JMP | BPF_JNE | BPF_K: /* JMP_IMM */
-		cmp_eq = (bpf_op == BPF_JEQ);
-		dst = ebpf_to_mips_reg(ctx, insn, dst_reg_fp_ok);
-		if (dst < 0)
-			return dst;
-		if (insn->imm == 0) {
-			src = MIPS_R_ZERO;
-		} else {
-			gen_imm_to_reg(insn, MIPS_R_AT, ctx);
-			src = MIPS_R_AT;
-		}
-		goto jeq_common;
-	case BPF_JMP | BPF_JEQ | BPF_X: /* JMP_REG */
-	case BPF_JMP | BPF_JNE | BPF_X:
-	case BPF_JMP | BPF_JSLT | BPF_X:
-	case BPF_JMP | BPF_JSLE | BPF_X:
-	case BPF_JMP | BPF_JSGT | BPF_X:
-	case BPF_JMP | BPF_JSGE | BPF_X:
-	case BPF_JMP | BPF_JLT | BPF_X:
-	case BPF_JMP | BPF_JLE | BPF_X:
-	case BPF_JMP | BPF_JGT | BPF_X:
-	case BPF_JMP | BPF_JGE | BPF_X:
-	case BPF_JMP | BPF_JSET | BPF_X:
-		src = ebpf_to_mips_reg(ctx, insn, src_reg_no_fp);
-		dst = ebpf_to_mips_reg(ctx, insn, dst_reg);
-		if (src < 0 || dst < 0)
-			return -EINVAL;
-		td = get_reg_val_type(ctx, this_idx, insn->dst_reg);
-		ts = get_reg_val_type(ctx, this_idx, insn->src_reg);
-		if (td == REG_32BIT && ts != REG_32BIT) {
-			emit_instr(ctx, sll, MIPS_R_AT, src, 0);
-			src = MIPS_R_AT;
-		} else if (ts == REG_32BIT && td != REG_32BIT) {
-			emit_instr(ctx, sll, MIPS_R_AT, dst, 0);
-			dst = MIPS_R_AT;
-		}
-		if (bpf_op == BPF_JSET) {
-			emit_instr(ctx, and, MIPS_R_AT, dst, src);
-			cmp_eq = false;
-			dst = MIPS_R_AT;
-			src = MIPS_R_ZERO;
-		} else if (bpf_op == BPF_JSGT || bpf_op == BPF_JSLE) {
-			emit_instr(ctx, dsubu, MIPS_R_AT, dst, src);
-			if ((insn + 1)->code == (BPF_JMP | BPF_EXIT) && insn->off == 1) {
-				b_off = b_imm(exit_idx, ctx);
-				if (is_bad_offset(b_off))
-					return -E2BIG;
-				if (bpf_op == BPF_JSGT)
-					emit_instr(ctx, blez, MIPS_R_AT, b_off);
-				else
-					emit_instr(ctx, bgtz, MIPS_R_AT, b_off);
-				emit_instr(ctx, nop);
-				return 2; /* We consumed the exit. */
-			}
-			b_off = b_imm(this_idx + insn->off + 1, ctx);
-			if (is_bad_offset(b_off))
-				return -E2BIG;
-			if (bpf_op == BPF_JSGT)
-				emit_instr(ctx, bgtz, MIPS_R_AT, b_off);
-			else
-				emit_instr(ctx, blez, MIPS_R_AT, b_off);
-			emit_instr(ctx, nop);
-			break;
-		} else if (bpf_op == BPF_JSGE || bpf_op == BPF_JSLT) {
-			emit_instr(ctx, slt, MIPS_R_AT, dst, src);
-			cmp_eq = bpf_op == BPF_JSGE;
-			dst = MIPS_R_AT;
-			src = MIPS_R_ZERO;
-		} else if (bpf_op == BPF_JGT || bpf_op == BPF_JLE) {
-			/* dst or src could be AT */
-			emit_instr(ctx, dsubu, MIPS_R_T8, dst, src);
-			emit_instr(ctx, sltu, MIPS_R_AT, dst, src);
-			/* SP known to be non-zero, movz becomes boolean not */
-			if (MIPS_ISA_REV >= 6) {
-				emit_instr(ctx, seleqz, MIPS_R_T9,
-						MIPS_R_SP, MIPS_R_T8);
-			} else {
-				emit_instr(ctx, movz, MIPS_R_T9,
-						MIPS_R_SP, MIPS_R_T8);
-				emit_instr(ctx, movn, MIPS_R_T9,
-						MIPS_R_ZERO, MIPS_R_T8);
-			}
-			emit_instr(ctx, or, MIPS_R_AT, MIPS_R_T9, MIPS_R_AT);
-			cmp_eq = bpf_op == BPF_JGT;
-			dst = MIPS_R_AT;
-			src = MIPS_R_ZERO;
-		} else if (bpf_op == BPF_JGE || bpf_op == BPF_JLT) {
-			emit_instr(ctx, sltu, MIPS_R_AT, dst, src);
-			cmp_eq = bpf_op == BPF_JGE;
-			dst = MIPS_R_AT;
-			src = MIPS_R_ZERO;
-		} else { /* JNE/JEQ case */
-			cmp_eq = (bpf_op == BPF_JEQ);
-		}
-jeq_common:
-		/*
-		 * If the next insn is EXIT and we are jumping arround
-		 * only it, invert the sense of the compare and
-		 * conditionally jump to the exit.  Poor man's branch
-		 * chaining.
-		 */
-		if ((insn + 1)->code == (BPF_JMP | BPF_EXIT) && insn->off == 1) {
-			b_off = b_imm(exit_idx, ctx);
-			if (is_bad_offset(b_off)) {
-				target = j_target(ctx, exit_idx);
-				if (target == (unsigned int)-1)
-					return -E2BIG;
-				cmp_eq = !cmp_eq;
-				b_off = 4 * 3;
-				if (!(ctx->offsets[this_idx] & OFFSETS_B_CONV)) {
-					ctx->offsets[this_idx] |= OFFSETS_B_CONV;
-					ctx->long_b_conversion = 1;
-				}
-			}
-
-			if (cmp_eq)
-				emit_instr(ctx, bne, dst, src, b_off);
-			else
-				emit_instr(ctx, beq, dst, src, b_off);
-			emit_instr(ctx, nop);
-			if (ctx->offsets[this_idx] & OFFSETS_B_CONV) {
-				emit_instr(ctx, j, target);
-				emit_instr(ctx, nop);
-			}
-			return 2; /* We consumed the exit. */
-		}
-		b_off = b_imm(this_idx + insn->off + 1, ctx);
-		if (is_bad_offset(b_off)) {
-			target = j_target(ctx, this_idx + insn->off + 1);
-			if (target == (unsigned int)-1)
-				return -E2BIG;
-			cmp_eq = !cmp_eq;
-			b_off = 4 * 3;
-			if (!(ctx->offsets[this_idx] & OFFSETS_B_CONV)) {
-				ctx->offsets[this_idx] |= OFFSETS_B_CONV;
-				ctx->long_b_conversion = 1;
-			}
-		}
-
-		if (cmp_eq)
-			emit_instr(ctx, beq, dst, src, b_off);
-		else
-			emit_instr(ctx, bne, dst, src, b_off);
-		emit_instr(ctx, nop);
-		if (ctx->offsets[this_idx] & OFFSETS_B_CONV) {
-			emit_instr(ctx, j, target);
-			emit_instr(ctx, nop);
-		}
-		break;
-	case BPF_JMP | BPF_JSGT | BPF_K: /* JMP_IMM */
-	case BPF_JMP | BPF_JSGE | BPF_K: /* JMP_IMM */
-	case BPF_JMP | BPF_JSLT | BPF_K: /* JMP_IMM */
-	case BPF_JMP | BPF_JSLE | BPF_K: /* JMP_IMM */
-		cmp_eq = (bpf_op == BPF_JSGE);
-		dst = ebpf_to_mips_reg(ctx, insn, dst_reg_fp_ok);
-		if (dst < 0)
-			return dst;
-
-		if (insn->imm == 0) {
-			if ((insn + 1)->code == (BPF_JMP | BPF_EXIT) && insn->off == 1) {
-				b_off = b_imm(exit_idx, ctx);
-				if (is_bad_offset(b_off))
-					return -E2BIG;
-				switch (bpf_op) {
-				case BPF_JSGT:
-					emit_instr(ctx, blez, dst, b_off);
-					break;
-				case BPF_JSGE:
-					emit_instr(ctx, bltz, dst, b_off);
-					break;
-				case BPF_JSLT:
-					emit_instr(ctx, bgez, dst, b_off);
-					break;
-				case BPF_JSLE:
-					emit_instr(ctx, bgtz, dst, b_off);
-					break;
-				}
-				emit_instr(ctx, nop);
-				return 2; /* We consumed the exit. */
-			}
-			b_off = b_imm(this_idx + insn->off + 1, ctx);
-			if (is_bad_offset(b_off))
-				return -E2BIG;
-			switch (bpf_op) {
-			case BPF_JSGT:
-				emit_instr(ctx, bgtz, dst, b_off);
-				break;
-			case BPF_JSGE:
-				emit_instr(ctx, bgez, dst, b_off);
-				break;
-			case BPF_JSLT:
-				emit_instr(ctx, bltz, dst, b_off);
-				break;
-			case BPF_JSLE:
-				emit_instr(ctx, blez, dst, b_off);
-				break;
-			}
-			emit_instr(ctx, nop);
-			break;
-		}
-		/*
-		 * only "LT" compare available, so we must use imm + 1
-		 * to generate "GT" and imm -1 to generate LE
-		 */
-		if (bpf_op == BPF_JSGT)
-			t64s = insn->imm + 1;
-		else if (bpf_op == BPF_JSLE)
-			t64s = insn->imm + 1;
-		else
-			t64s = insn->imm;
-
-		cmp_eq = bpf_op == BPF_JSGT || bpf_op == BPF_JSGE;
-		if (t64s >= S16_MIN && t64s <= S16_MAX) {
-			emit_instr(ctx, slti, MIPS_R_AT, dst, (int)t64s);
-			src = MIPS_R_AT;
-			dst = MIPS_R_ZERO;
-			goto jeq_common;
-		}
-		emit_const_to_reg(ctx, MIPS_R_AT, (u64)t64s);
-		emit_instr(ctx, slt, MIPS_R_AT, dst, MIPS_R_AT);
-		src = MIPS_R_AT;
-		dst = MIPS_R_ZERO;
-		goto jeq_common;
-
-	case BPF_JMP | BPF_JGT | BPF_K:
-	case BPF_JMP | BPF_JGE | BPF_K:
-	case BPF_JMP | BPF_JLT | BPF_K:
-	case BPF_JMP | BPF_JLE | BPF_K:
-		cmp_eq = (bpf_op == BPF_JGE);
-		dst = ebpf_to_mips_reg(ctx, insn, dst_reg_fp_ok);
-		if (dst < 0)
-			return dst;
-		/*
-		 * only "LT" compare available, so we must use imm + 1
-		 * to generate "GT" and imm -1 to generate LE
-		 */
-		if (bpf_op == BPF_JGT)
-			t64s = (u64)(u32)(insn->imm) + 1;
-		else if (bpf_op == BPF_JLE)
-			t64s = (u64)(u32)(insn->imm) + 1;
-		else
-			t64s = (u64)(u32)(insn->imm);
-
-		cmp_eq = bpf_op == BPF_JGT || bpf_op == BPF_JGE;
-
-		emit_const_to_reg(ctx, MIPS_R_AT, (u64)t64s);
-		emit_instr(ctx, sltu, MIPS_R_AT, dst, MIPS_R_AT);
-		src = MIPS_R_AT;
-		dst = MIPS_R_ZERO;
-		goto jeq_common;
-
-	case BPF_JMP | BPF_JSET | BPF_K: /* JMP_IMM */
-		dst = ebpf_to_mips_reg(ctx, insn, dst_reg_fp_ok);
-		if (dst < 0)
-			return dst;
-
-		if (ctx->use_bbit_insns && hweight32((u32)insn->imm) == 1) {
-			if ((insn + 1)->code == (BPF_JMP | BPF_EXIT) && insn->off == 1) {
-				b_off = b_imm(exit_idx, ctx);
-				if (is_bad_offset(b_off))
-					return -E2BIG;
-				emit_instr(ctx, bbit0, dst, ffs((u32)insn->imm) - 1, b_off);
-				emit_instr(ctx, nop);
-				return 2; /* We consumed the exit. */
-			}
-			b_off = b_imm(this_idx + insn->off + 1, ctx);
-			if (is_bad_offset(b_off))
-				return -E2BIG;
-			emit_instr(ctx, bbit1, dst, ffs((u32)insn->imm) - 1, b_off);
-			emit_instr(ctx, nop);
-			break;
-		}
-		t64 = (u32)insn->imm;
-		emit_const_to_reg(ctx, MIPS_R_AT, t64);
-		emit_instr(ctx, and, MIPS_R_AT, dst, MIPS_R_AT);
-		src = MIPS_R_AT;
-		dst = MIPS_R_ZERO;
-		cmp_eq = false;
-		goto jeq_common;
-
-	case BPF_JMP | BPF_JA:
-		/*
-		 * Prefer relative branch for easier debugging, but
-		 * fall back if needed.
-		 */
-		b_off = b_imm(this_idx + insn->off + 1, ctx);
-		if (is_bad_offset(b_off)) {
-			target = j_target(ctx, this_idx + insn->off + 1);
-			if (target == (unsigned int)-1)
-				return -E2BIG;
-			emit_instr(ctx, j, target);
-		} else {
-			emit_instr(ctx, b, b_off);
-		}
-		emit_instr(ctx, nop);
-		break;
-	case BPF_LD | BPF_DW | BPF_IMM:
-		if (insn->src_reg != 0)
-			return -EINVAL;
-		dst = ebpf_to_mips_reg(ctx, insn, dst_reg);
-		if (dst < 0)
-			return dst;
-		t64 = ((u64)(u32)insn->imm) | ((u64)(insn + 1)->imm << 32);
-		emit_const_to_reg(ctx, dst, t64);
-		return 2; /* Double slot insn */
-
-	case BPF_JMP | BPF_CALL:
-		ctx->flags |= EBPF_SAVE_RA;
-		t64s = (s64)insn->imm + (long)__bpf_call_base;
-		emit_const_to_reg(ctx, MIPS_R_T9, (u64)t64s);
-		emit_instr(ctx, jalr, MIPS_R_RA, MIPS_R_T9);
-		/* delay slot */
-		emit_instr(ctx, nop);
-		break;
-
-	case BPF_JMP | BPF_TAIL_CALL:
-		if (emit_bpf_tail_call(ctx, this_idx))
-			return -EINVAL;
-		break;
-
-	case BPF_ALU | BPF_END | BPF_FROM_BE:
-	case BPF_ALU | BPF_END | BPF_FROM_LE:
-		dst = ebpf_to_mips_reg(ctx, insn, dst_reg);
-		if (dst < 0)
-			return dst;
-		td = get_reg_val_type(ctx, this_idx, insn->dst_reg);
-		if (insn->imm == 64 && td == REG_32BIT)
-			emit_instr(ctx, dinsu, dst, MIPS_R_ZERO, 32, 32);
-
-		if (insn->imm != 64 && td == REG_64BIT) {
-			/* sign extend */
-			emit_instr(ctx, sll, dst, dst, 0);
-		}
-
-#ifdef __BIG_ENDIAN
-		need_swap = (BPF_SRC(insn->code) == BPF_FROM_LE);
-#else
-		need_swap = (BPF_SRC(insn->code) == BPF_FROM_BE);
-#endif
-		if (insn->imm == 16) {
-			if (need_swap)
-				emit_instr(ctx, wsbh, dst, dst);
-			emit_instr(ctx, andi, dst, dst, 0xffff);
-		} else if (insn->imm == 32) {
-			if (need_swap) {
-				emit_instr(ctx, wsbh, dst, dst);
-				emit_instr(ctx, rotr, dst, dst, 16);
-			}
-		} else { /* 64-bit*/
-			if (need_swap) {
-				emit_instr(ctx, dsbh, dst, dst);
-				emit_instr(ctx, dshd, dst, dst);
-			}
-		}
-		break;
-
-	case BPF_ST | BPF_NOSPEC: /* speculation barrier */
-		break;
-
-	case BPF_ST | BPF_B | BPF_MEM:
-	case BPF_ST | BPF_H | BPF_MEM:
-	case BPF_ST | BPF_W | BPF_MEM:
-	case BPF_ST | BPF_DW | BPF_MEM:
-		if (insn->dst_reg == BPF_REG_10) {
-			ctx->flags |= EBPF_SEEN_FP;
-			dst = MIPS_R_SP;
-			mem_off = insn->off + MAX_BPF_STACK;
-		} else {
-			dst = ebpf_to_mips_reg(ctx, insn, dst_reg);
-			if (dst < 0)
-				return dst;
-			mem_off = insn->off;
-		}
-		gen_imm_to_reg(insn, MIPS_R_AT, ctx);
-		switch (BPF_SIZE(insn->code)) {
-		case BPF_B:
-			emit_instr(ctx, sb, MIPS_R_AT, mem_off, dst);
-			break;
-		case BPF_H:
-			emit_instr(ctx, sh, MIPS_R_AT, mem_off, dst);
-			break;
-		case BPF_W:
-			emit_instr(ctx, sw, MIPS_R_AT, mem_off, dst);
-			break;
-		case BPF_DW:
-			emit_instr(ctx, sd, MIPS_R_AT, mem_off, dst);
-			break;
-		}
-		break;
-
-	case BPF_LDX | BPF_B | BPF_MEM:
-	case BPF_LDX | BPF_H | BPF_MEM:
-	case BPF_LDX | BPF_W | BPF_MEM:
-	case BPF_LDX | BPF_DW | BPF_MEM:
-		if (insn->src_reg == BPF_REG_10) {
-			ctx->flags |= EBPF_SEEN_FP;
-			src = MIPS_R_SP;
-			mem_off = insn->off + MAX_BPF_STACK;
-		} else {
-			src = ebpf_to_mips_reg(ctx, insn, src_reg_no_fp);
-			if (src < 0)
-				return src;
-			mem_off = insn->off;
-		}
-		dst = ebpf_to_mips_reg(ctx, insn, dst_reg);
-		if (dst < 0)
-			return dst;
-		switch (BPF_SIZE(insn->code)) {
-		case BPF_B:
-			emit_instr(ctx, lbu, dst, mem_off, src);
-			break;
-		case BPF_H:
-			emit_instr(ctx, lhu, dst, mem_off, src);
-			break;
-		case BPF_W:
-			emit_instr(ctx, lw, dst, mem_off, src);
-			break;
-		case BPF_DW:
-			emit_instr(ctx, ld, dst, mem_off, src);
-			break;
-		}
-		break;
-
-	case BPF_STX | BPF_B | BPF_MEM:
-	case BPF_STX | BPF_H | BPF_MEM:
-	case BPF_STX | BPF_W | BPF_MEM:
-	case BPF_STX | BPF_DW | BPF_MEM:
-	case BPF_STX | BPF_W | BPF_ATOMIC:
-	case BPF_STX | BPF_DW | BPF_ATOMIC:
-		if (insn->dst_reg == BPF_REG_10) {
-			ctx->flags |= EBPF_SEEN_FP;
-			dst = MIPS_R_SP;
-			mem_off = insn->off + MAX_BPF_STACK;
-		} else {
-			dst = ebpf_to_mips_reg(ctx, insn, dst_reg);
-			if (dst < 0)
-				return dst;
-			mem_off = insn->off;
-		}
-		src = ebpf_to_mips_reg(ctx, insn, src_reg_no_fp);
-		if (src < 0)
-			return src;
-		if (BPF_MODE(insn->code) == BPF_ATOMIC) {
-			if (insn->imm != BPF_ADD) {
-				pr_err("ATOMIC OP %02x NOT HANDLED\n", insn->imm);
-				return -EINVAL;
-			}
-
-			/*
-			 * If mem_off does not fit within the 9 bit ll/sc
-			 * instruction immediate field, use a temp reg.
-			 */
-			if (MIPS_ISA_REV >= 6 &&
-			    (mem_off >= BIT(8) || mem_off < -BIT(8))) {
-				emit_instr(ctx, daddiu, MIPS_R_T6,
-						dst, mem_off);
-				mem_off = 0;
-				dst = MIPS_R_T6;
-			}
-			switch (BPF_SIZE(insn->code)) {
-			case BPF_W:
-				if (get_reg_val_type(ctx, this_idx, insn->src_reg) == REG_32BIT) {
-					emit_instr(ctx, sll, MIPS_R_AT, src, 0);
-					src = MIPS_R_AT;
-				}
-				emit_instr(ctx, ll, MIPS_R_T8, mem_off, dst);
-				emit_instr(ctx, addu, MIPS_R_T8, MIPS_R_T8, src);
-				emit_instr(ctx, sc, MIPS_R_T8, mem_off, dst);
-				/*
-				 * On failure back up to LL (-4
-				 * instructions of 4 bytes each
-				 */
-				emit_instr(ctx, beq, MIPS_R_T8, MIPS_R_ZERO, -4 * 4);
-				emit_instr(ctx, nop);
-				break;
-			case BPF_DW:
-				if (get_reg_val_type(ctx, this_idx, insn->src_reg) == REG_32BIT) {
-					emit_instr(ctx, daddu, MIPS_R_AT, src, MIPS_R_ZERO);
-					emit_instr(ctx, dinsu, MIPS_R_AT, MIPS_R_ZERO, 32, 32);
-					src = MIPS_R_AT;
-				}
-				emit_instr(ctx, lld, MIPS_R_T8, mem_off, dst);
-				emit_instr(ctx, daddu, MIPS_R_T8, MIPS_R_T8, src);
-				emit_instr(ctx, scd, MIPS_R_T8, mem_off, dst);
-				emit_instr(ctx, beq, MIPS_R_T8, MIPS_R_ZERO, -4 * 4);
-				emit_instr(ctx, nop);
-				break;
-			}
-		} else { /* BPF_MEM */
-			switch (BPF_SIZE(insn->code)) {
-			case BPF_B:
-				emit_instr(ctx, sb, src, mem_off, dst);
-				break;
-			case BPF_H:
-				emit_instr(ctx, sh, src, mem_off, dst);
-				break;
-			case BPF_W:
-				emit_instr(ctx, sw, src, mem_off, dst);
-				break;
-			case BPF_DW:
-				if (get_reg_val_type(ctx, this_idx, insn->src_reg) == REG_32BIT) {
-					emit_instr(ctx, daddu, MIPS_R_AT, src, MIPS_R_ZERO);
-					emit_instr(ctx, dinsu, MIPS_R_AT, MIPS_R_ZERO, 32, 32);
-					src = MIPS_R_AT;
-				}
-				emit_instr(ctx, sd, src, mem_off, dst);
-				break;
-			}
-		}
-		break;
-
-	default:
-		pr_err("NOT HANDLED %d - (%02x)\n",
-		       this_idx, (unsigned int)insn->code);
-		return -EINVAL;
-	}
-	return 1;
-}
-
-#define RVT_VISITED_MASK 0xc000000000000000ull
-#define RVT_FALL_THROUGH 0x4000000000000000ull
-#define RVT_BRANCH_TAKEN 0x8000000000000000ull
-#define RVT_DONE (RVT_FALL_THROUGH | RVT_BRANCH_TAKEN)
-
-static int build_int_body(struct jit_ctx *ctx)
-{
-	const struct bpf_prog *prog = ctx->skf;
-	const struct bpf_insn *insn;
-	int i, r;
-
-	for (i = 0; i < prog->len; ) {
-		insn = prog->insnsi + i;
-		if ((ctx->reg_val_types[i] & RVT_VISITED_MASK) == 0) {
-			/* dead instruction, don't emit it. */
-			i++;
-			continue;
-		}
-
-		if (ctx->target == NULL)
-			ctx->offsets[i] = (ctx->offsets[i] & OFFSETS_B_CONV) | (ctx->idx * 4);
-
-		r = build_one_insn(insn, ctx, i, prog->len);
-		if (r < 0)
-			return r;
-		i += r;
-	}
-	/* epilogue offset */
-	if (ctx->target == NULL)
-		ctx->offsets[i] = ctx->idx * 4;
-
-	/*
-	 * All exits have an offset of the epilogue, some offsets may
-	 * not have been set due to banch-around threading, so set
-	 * them now.
-	 */
-	if (ctx->target == NULL)
-		for (i = 0; i < prog->len; i++) {
-			insn = prog->insnsi + i;
-			if (insn->code == (BPF_JMP | BPF_EXIT))
-				ctx->offsets[i] = ctx->idx * 4;
-		}
-	return 0;
-}
-
-/* return the last idx processed, or negative for error */
-static int reg_val_propagate_range(struct jit_ctx *ctx, u64 initial_rvt,
-				   int start_idx, bool follow_taken)
-{
-	const struct bpf_prog *prog = ctx->skf;
-	const struct bpf_insn *insn;
-	u64 exit_rvt = initial_rvt;
-	u64 *rvt = ctx->reg_val_types;
-	int idx;
-	int reg;
-
-	for (idx = start_idx; idx < prog->len; idx++) {
-		rvt[idx] = (rvt[idx] & RVT_VISITED_MASK) | exit_rvt;
-		insn = prog->insnsi + idx;
-		switch (BPF_CLASS(insn->code)) {
-		case BPF_ALU:
-			switch (BPF_OP(insn->code)) {
-			case BPF_ADD:
-			case BPF_SUB:
-			case BPF_MUL:
-			case BPF_DIV:
-			case BPF_OR:
-			case BPF_AND:
-			case BPF_LSH:
-			case BPF_RSH:
-			case BPF_NEG:
-			case BPF_MOD:
-			case BPF_XOR:
-				set_reg_val_type(&exit_rvt, insn->dst_reg, REG_32BIT);
-				break;
-			case BPF_MOV:
-				if (BPF_SRC(insn->code)) {
-					set_reg_val_type(&exit_rvt, insn->dst_reg, REG_32BIT);
-				} else {
-					/* IMM to REG move*/
-					if (insn->imm >= 0)
-						set_reg_val_type(&exit_rvt, insn->dst_reg, REG_32BIT_POS);
-					else
-						set_reg_val_type(&exit_rvt, insn->dst_reg, REG_32BIT);
-				}
-				break;
-			case BPF_END:
-				if (insn->imm == 64)
-					set_reg_val_type(&exit_rvt, insn->dst_reg, REG_64BIT);
-				else if (insn->imm == 32)
-					set_reg_val_type(&exit_rvt, insn->dst_reg, REG_32BIT);
-				else /* insn->imm == 16 */
-					set_reg_val_type(&exit_rvt, insn->dst_reg, REG_32BIT_POS);
-				break;
-			}
-			rvt[idx] |= RVT_DONE;
-			break;
-		case BPF_ALU64:
-			switch (BPF_OP(insn->code)) {
-			case BPF_MOV:
-				if (BPF_SRC(insn->code)) {
-					/* REG to REG move*/
-					set_reg_val_type(&exit_rvt, insn->dst_reg, REG_64BIT);
-				} else {
-					/* IMM to REG move*/
-					if (insn->imm >= 0)
-						set_reg_val_type(&exit_rvt, insn->dst_reg, REG_32BIT_POS);
-					else
-						set_reg_val_type(&exit_rvt, insn->dst_reg, REG_64BIT_32BIT);
-				}
-				break;
-			default:
-				set_reg_val_type(&exit_rvt, insn->dst_reg, REG_64BIT);
-			}
-			rvt[idx] |= RVT_DONE;
-			break;
-		case BPF_LD:
-			switch (BPF_SIZE(insn->code)) {
-			case BPF_DW:
-				if (BPF_MODE(insn->code) == BPF_IMM) {
-					s64 val;
-
-					val = (s64)((u32)insn->imm | ((u64)(insn + 1)->imm << 32));
-					if (val > 0 && val <= S32_MAX)
-						set_reg_val_type(&exit_rvt, insn->dst_reg, REG_32BIT_POS);
-					else if (val >= S32_MIN && val <= S32_MAX)
-						set_reg_val_type(&exit_rvt, insn->dst_reg, REG_64BIT_32BIT);
-					else
-						set_reg_val_type(&exit_rvt, insn->dst_reg, REG_64BIT);
-					rvt[idx] |= RVT_DONE;
-					idx++;
-				} else {
-					set_reg_val_type(&exit_rvt, insn->dst_reg, REG_64BIT);
-				}
-				break;
-			case BPF_B:
-			case BPF_H:
-				set_reg_val_type(&exit_rvt, insn->dst_reg, REG_32BIT_POS);
-				break;
-			case BPF_W:
-				if (BPF_MODE(insn->code) == BPF_IMM)
-					set_reg_val_type(&exit_rvt, insn->dst_reg,
-							 insn->imm >= 0 ? REG_32BIT_POS : REG_32BIT);
-				else
-					set_reg_val_type(&exit_rvt, insn->dst_reg, REG_32BIT);
-				break;
-			}
-			rvt[idx] |= RVT_DONE;
-			break;
-		case BPF_LDX:
-			switch (BPF_SIZE(insn->code)) {
-			case BPF_DW:
-				set_reg_val_type(&exit_rvt, insn->dst_reg, REG_64BIT);
-				break;
-			case BPF_B:
-			case BPF_H:
-				set_reg_val_type(&exit_rvt, insn->dst_reg, REG_32BIT_POS);
-				break;
-			case BPF_W:
-				set_reg_val_type(&exit_rvt, insn->dst_reg, REG_32BIT);
-				break;
-			}
-			rvt[idx] |= RVT_DONE;
-			break;
-		case BPF_JMP:
-			switch (BPF_OP(insn->code)) {
-			case BPF_EXIT:
-				rvt[idx] = RVT_DONE | exit_rvt;
-				rvt[prog->len] = exit_rvt;
-				return idx;
-			case BPF_JA:
-				rvt[idx] |= RVT_DONE;
-				idx += insn->off;
-				break;
-			case BPF_JEQ:
-			case BPF_JGT:
-			case BPF_JGE:
-			case BPF_JLT:
-			case BPF_JLE:
-			case BPF_JSET:
-			case BPF_JNE:
-			case BPF_JSGT:
-			case BPF_JSGE:
-			case BPF_JSLT:
-			case BPF_JSLE:
-				if (follow_taken) {
-					rvt[idx] |= RVT_BRANCH_TAKEN;
-					idx += insn->off;
-					follow_taken = false;
-				} else {
-					rvt[idx] |= RVT_FALL_THROUGH;
-				}
-				break;
-			case BPF_CALL:
-				set_reg_val_type(&exit_rvt, BPF_REG_0, REG_64BIT);
-				/* Upon call return, argument registers are clobbered. */
-				for (reg = BPF_REG_0; reg <= BPF_REG_5; reg++)
-					set_reg_val_type(&exit_rvt, reg, REG_64BIT);
-
-				rvt[idx] |= RVT_DONE;
-				break;
-			default:
-				WARN(1, "Unhandled BPF_JMP case.\n");
-				rvt[idx] |= RVT_DONE;
-				break;
-			}
-			break;
-		default:
-			rvt[idx] |= RVT_DONE;
-			break;
-		}
-	}
-	return idx;
-}
-
-/*
- * Track the value range (i.e. 32-bit vs. 64-bit) of each register at
- * each eBPF insn.  This allows unneeded sign and zero extension
- * operations to be omitted.
- *
- * Doesn't handle yet confluence of control paths with conflicting
- * ranges, but it is good enough for most sane code.
- */
-static int reg_val_propagate(struct jit_ctx *ctx)
-{
-	const struct bpf_prog *prog = ctx->skf;
-	u64 exit_rvt;
-	int reg;
-	int i;
-
-	/*
-	 * 11 registers * 3 bits/reg leaves top bits free for other
-	 * uses.  Bit-62..63 used to see if we have visited an insn.
-	 */
-	exit_rvt = 0;
-
-	/* Upon entry, argument registers are 64-bit. */
-	for (reg = BPF_REG_1; reg <= BPF_REG_5; reg++)
-		set_reg_val_type(&exit_rvt, reg, REG_64BIT);
-
-	/*
-	 * First follow all conditional branches on the fall-through
-	 * edge of control flow..
-	 */
-	reg_val_propagate_range(ctx, exit_rvt, 0, false);
-restart_search:
-	/*
-	 * Then repeatedly find the first conditional branch where
-	 * both edges of control flow have not been taken, and follow
-	 * the branch taken edge.  We will end up restarting the
-	 * search once per conditional branch insn.
-	 */
-	for (i = 0; i < prog->len; i++) {
-		u64 rvt = ctx->reg_val_types[i];
-
-		if ((rvt & RVT_VISITED_MASK) == RVT_DONE ||
-		    (rvt & RVT_VISITED_MASK) == 0)
-			continue;
-		if ((rvt & RVT_VISITED_MASK) == RVT_FALL_THROUGH) {
-			reg_val_propagate_range(ctx, rvt & ~RVT_VISITED_MASK, i, true);
-		} else { /* RVT_BRANCH_TAKEN */
-			WARN(1, "Unexpected RVT_BRANCH_TAKEN case.\n");
-			reg_val_propagate_range(ctx, rvt & ~RVT_VISITED_MASK, i, false);
-		}
-		goto restart_search;
-	}
-	/*
-	 * Eventually all conditional branches have been followed on
-	 * both branches and we are done.  Any insn that has not been
-	 * visited at this point is dead.
-	 */
-
-	return 0;
-}
-
-static void jit_fill_hole(void *area, unsigned int size)
-{
-	u32 *p;
-
-	/* We are guaranteed to have aligned memory. */
-	for (p = area; size >= sizeof(u32); size -= sizeof(u32))
-		uasm_i_break(&p, BRK_BUG); /* Increments p */
-}
-
-struct bpf_prog *bpf_int_jit_compile(struct bpf_prog *prog)
-{
-	struct bpf_prog *orig_prog = prog;
-	bool tmp_blinded = false;
-	struct bpf_prog *tmp;
-	struct bpf_binary_header *header = NULL;
-	struct jit_ctx ctx;
-	unsigned int image_size;
-	u8 *image_ptr;
-
-	if (!prog->jit_requested)
-		return prog;
-
-	tmp = bpf_jit_blind_constants(prog);
-	/* If blinding was requested and we failed during blinding,
-	 * we must fall back to the interpreter.
-	 */
-	if (IS_ERR(tmp))
-		return orig_prog;
-	if (tmp != prog) {
-		tmp_blinded = true;
-		prog = tmp;
-	}
-
-	memset(&ctx, 0, sizeof(ctx));
-
-	preempt_disable();
-	switch (current_cpu_type()) {
-	case CPU_CAVIUM_OCTEON:
-	case CPU_CAVIUM_OCTEON_PLUS:
-	case CPU_CAVIUM_OCTEON2:
-	case CPU_CAVIUM_OCTEON3:
-		ctx.use_bbit_insns = 1;
-		break;
-	default:
-		ctx.use_bbit_insns = 0;
-	}
-	preempt_enable();
-
-	ctx.offsets = kcalloc(prog->len + 1, sizeof(*ctx.offsets), GFP_KERNEL);
-	if (ctx.offsets == NULL)
-		goto out_err;
-
-	ctx.reg_val_types = kcalloc(prog->len + 1, sizeof(*ctx.reg_val_types), GFP_KERNEL);
-	if (ctx.reg_val_types == NULL)
-		goto out_err;
-
-	ctx.skf = prog;
-
-	if (reg_val_propagate(&ctx))
-		goto out_err;
-
-	/*
-	 * First pass discovers used resources and instruction offsets
-	 * assuming short branches are used.
-	 */
-	if (build_int_body(&ctx))
-		goto out_err;
-
-	/*
-	 * If no calls are made (EBPF_SAVE_RA), then tail call count
-	 * in $v1, else we must save in n$s4.
-	 */
-	if (ctx.flags & EBPF_SEEN_TC) {
-		if (ctx.flags & EBPF_SAVE_RA)
-			ctx.flags |= EBPF_SAVE_S4;
-		else
-			ctx.flags |= EBPF_TCC_IN_V1;
-	}
-
-	/*
-	 * Second pass generates offsets, if any branches are out of
-	 * range a jump-around long sequence is generated, and we have
-	 * to try again from the beginning to generate the new
-	 * offsets.  This is done until no additional conversions are
-	 * necessary.
-	 */
-	do {
-		ctx.idx = 0;
-		ctx.gen_b_offsets = 1;
-		ctx.long_b_conversion = 0;
-		if (gen_int_prologue(&ctx))
-			goto out_err;
-		if (build_int_body(&ctx))
-			goto out_err;
-		if (build_int_epilogue(&ctx, MIPS_R_RA))
-			goto out_err;
-	} while (ctx.long_b_conversion);
-
-	image_size = 4 * ctx.idx;
-
-	header = bpf_jit_binary_alloc(image_size, &image_ptr,
-				      sizeof(u32), jit_fill_hole);
-	if (header == NULL)
-		goto out_err;
-
-	ctx.target = (u32 *)image_ptr;
-
-	/* Third pass generates the code */
-	ctx.idx = 0;
-	if (gen_int_prologue(&ctx))
-		goto out_err;
-	if (build_int_body(&ctx))
-		goto out_err;
-	if (build_int_epilogue(&ctx, MIPS_R_RA))
-		goto out_err;
-
-	/* Update the icache */
-	flush_icache_range((unsigned long)ctx.target,
-			   (unsigned long)&ctx.target[ctx.idx]);
-
-	if (bpf_jit_enable > 1)
-		/* Dump JIT code */
-		bpf_jit_dump(prog->len, image_size, 2, ctx.target);
-
-	bpf_jit_binary_lock_ro(header);
-	prog->bpf_func = (void *)ctx.target;
-	prog->jited = 1;
-	prog->jited_len = image_size;
-out_normal:
-	if (tmp_blinded)
-		bpf_jit_prog_release_other(prog, prog == orig_prog ?
-					   tmp : orig_prog);
-	kfree(ctx.offsets);
-	kfree(ctx.reg_val_types);
-
-	return prog;
-
-out_err:
-	prog = orig_prog;
-	if (header)
-		bpf_jit_binary_free(header);
-	goto out_normal;
-}