Adding upstream version 6.1.76.upstream/6.1.76

Signed-off-by: Daniel Baumann <daniel.baumann@progress-linux.org>

5 files changed, 4253 insertions, 0 deletions

diff --git a/arch/mips/net/Makefile b/arch/mips/net/Makefile
new file mode 100644
index 000000000..e3e6ae651
--- /dev/null
+++ b/arch/mips/net/Makefile
@@ -0,0 +1,10 @@
+# SPDX-License-Identifier: GPL-2.0-only
+# MIPS networking code
+
+obj-$(CONFIG_BPF_JIT) += bpf_jit_comp.o
+
+ifeq ($(CONFIG_32BIT),y)
+        obj-$(CONFIG_BPF_JIT) += bpf_jit_comp32.o
+else
+        obj-$(CONFIG_BPF_JIT) += bpf_jit_comp64.o
+endif
diff --git a/arch/mips/net/bpf_jit_comp.c b/arch/mips/net/bpf_jit_comp.c
new file mode 100644
index 000000000..b17130d51
--- /dev/null
+++ b/arch/mips/net/bpf_jit_comp.c
@@ -0,0 +1,1034 @@
+// SPDX-License-Identifier: GPL-2.0-only
+/*
+ * Just-In-Time compiler for eBPF bytecode on MIPS.
+ * Implementation of JIT functions common to 32-bit and 64-bit CPUs.
+ *
+ * Copyright (c) 2021 Anyfi Networks AB.
+ * Author: Johan Almbladh <johan.almbladh@gmail.com>
+ *
+ * Based on code and ideas from
+ * Copyright (c) 2017 Cavium, Inc.
+ * Copyright (c) 2017 Shubham Bansal <illusionist.neo@gmail.com>
+ * Copyright (c) 2011 Mircea Gherzan <mgherzan@gmail.com>
+ */
+
+/*
+ * Code overview
+ * =============
+ *
+ * - bpf_jit_comp.h
+ *   Common definitions and utilities.
+ *
+ * - bpf_jit_comp.c
+ *   Implementation of JIT top-level logic and exported JIT API functions.
+ *   Implementation of internal operations shared by 32-bit and 64-bit code.
+ *   JMP and ALU JIT control code, register control code, shared ALU and
+ *   JMP/JMP32 JIT operations.
+ *
+ * - bpf_jit_comp32.c
+ *   Implementation of functions to JIT prologue, epilogue and a single eBPF
+ *   instruction for 32-bit MIPS CPUs. The functions use shared operations
+ *   where possible, and implement the rest for 32-bit MIPS such as ALU64
+ *   operations.
+ *
+ * - bpf_jit_comp64.c
+ *   Ditto, for 64-bit MIPS CPUs.
+ *
+ * Zero and sign extension
+ * ========================
+ * 32-bit MIPS instructions on 64-bit MIPS registers use sign extension,
+ * but the eBPF instruction set mandates zero extension. We let the verifier
+ * insert explicit zero-extensions after 32-bit ALU operations, both for
+ * 32-bit and 64-bit MIPS JITs. Conditional JMP32 operations on 64-bit MIPs
+ * are JITed with sign extensions inserted when so expected.
+ *
+ * ALU operations
+ * ==============
+ * ALU operations on 32/64-bit MIPS and ALU64 operations on 64-bit MIPS are
+ * JITed in the following steps. ALU64 operations on 32-bit MIPS are more
+ * complicated and therefore only processed by special implementations in
+ * step (3).
+ *
+ * 1) valid_alu_i:
+ *    Determine if an immediate operation can be emitted as such, or if
+ *    we must fall back to the register version.
+ *
+ * 2) rewrite_alu_i:
+ *    Convert BPF operation and immediate value to a canonical form for
+ *    JITing. In some degenerate cases this form may be a no-op.
+ *
+ * 3) emit_alu_{i,i64,r,64}:
+ *    Emit instructions for an ALU or ALU64 immediate or register operation.
+ *
+ * JMP operations
+ * ==============
+ * JMP and JMP32 operations require an JIT instruction offset table for
+ * translating the jump offset. This table is computed by dry-running the
+ * JIT without actually emitting anything. However, the computed PC-relative
+ * offset may overflow the 18-bit offset field width of the native MIPS
+ * branch instruction. In such cases, the long jump is converted into the
+ * following sequence.
+ *
+ *    <branch> !<cond> +2    Inverted PC-relative branch
+ *    nop                    Delay slot
+ *    j <offset>             Unconditional absolute long jump
+ *    nop                    Delay slot
+ *
+ * Since this converted sequence alters the offset table, all offsets must
+ * be re-calculated. This may in turn trigger new branch conversions, so
+ * the process is repeated until no further changes are made. Normally it
+ * completes in 1-2 iterations. If JIT_MAX_ITERATIONS should reached, we
+ * fall back to converting every remaining jump operation. The branch
+ * conversion is independent of how the JMP or JMP32 condition is JITed.
+ *
+ * JMP32 and JMP operations are JITed as follows.
+ *
+ * 1) setup_jmp_{i,r}:
+ *    Convert jump conditional and offset into a form that can be JITed.
+ *    This form may be a no-op, a canonical form, or an inverted PC-relative
+ *    jump if branch conversion is necessary.
+ *
+ * 2) valid_jmp_i:
+ *    Determine if an immediate operations can be emitted as such, or if
+ *    we must fall back to the register version. Applies to JMP32 for 32-bit
+ *    MIPS, and both JMP and JMP32 for 64-bit MIPS.
+ *
+ * 3) emit_jmp_{i,i64,r,r64}:
+ *    Emit instructions for an JMP or JMP32 immediate or register operation.
+ *
+ * 4) finish_jmp_{i,r}:
+ *    Emit any instructions needed to finish the jump. This includes a nop
+ *    for the delay slot if a branch was emitted, and a long absolute jump
+ *    if the branch was converted.
+ */
+
+#include <linux/limits.h>
+#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/cacheflush.h>
+#include <asm/cpu-features.h>
+#include <asm/isa-rev.h>
+#include <asm/uasm.h>
+
+#include "bpf_jit_comp.h"
+
+/* Convenience macros for descriptor access */
+#define CONVERTED(desc)	((desc) & JIT_DESC_CONVERT)
+#define INDEX(desc)	((desc) & ~JIT_DESC_CONVERT)
+
+/*
+ * Push registers on the stack, starting at a given depth from the stack
+ * pointer and increasing. The next depth to be written is returned.
+ */
+int push_regs(struct jit_context *ctx, u32 mask, u32 excl, int depth)
+{
+	int reg;
+
+	for (reg = 0; reg < BITS_PER_BYTE * sizeof(mask); reg++)
+		if (mask & BIT(reg)) {
+			if ((excl & BIT(reg)) == 0) {
+				if (sizeof(long) == 4)
+					emit(ctx, sw, reg, depth, MIPS_R_SP);
+				else /* sizeof(long) == 8 */
+					emit(ctx, sd, reg, depth, MIPS_R_SP);
+			}
+			depth += sizeof(long);
+		}
+
+	ctx->stack_used = max((int)ctx->stack_used, depth);
+	return depth;
+}
+
+/*
+ * Pop registers from the stack, starting at a given depth from the stack
+ * pointer and increasing. The next depth to be read is returned.
+ */
+int pop_regs(struct jit_context *ctx, u32 mask, u32 excl, int depth)
+{
+	int reg;
+
+	for (reg = 0; reg < BITS_PER_BYTE * sizeof(mask); reg++)
+		if (mask & BIT(reg)) {
+			if ((excl & BIT(reg)) == 0) {
+				if (sizeof(long) == 4)
+					emit(ctx, lw, reg, depth, MIPS_R_SP);
+				else /* sizeof(long) == 8 */
+					emit(ctx, ld, reg, depth, MIPS_R_SP);
+			}
+			depth += sizeof(long);
+		}
+
+	return depth;
+}
+
+/* Compute the 28-bit jump target address from a BPF program location */
+int get_target(struct jit_context *ctx, u32 loc)
+{
+	u32 index = INDEX(ctx->descriptors[loc]);
+	unsigned long pc = (unsigned long)&ctx->target[ctx->jit_index];
+	unsigned long addr = (unsigned long)&ctx->target[index];
+
+	if (!ctx->target)
+		return 0;
+
+	if ((addr ^ pc) & ~MIPS_JMP_MASK)
+		return -1;
+
+	return addr & MIPS_JMP_MASK;
+}
+
+/* Compute the PC-relative offset to relative BPF program offset */
+int get_offset(const struct jit_context *ctx, int off)
+{
+	return (INDEX(ctx->descriptors[ctx->bpf_index + off]) -
+		ctx->jit_index - 1) * sizeof(u32);
+}
+
+/* dst = imm (register width) */
+void emit_mov_i(struct jit_context *ctx, u8 dst, s32 imm)
+{
+	if (imm >= -0x8000 && imm <= 0x7fff) {
+		emit(ctx, addiu, dst, MIPS_R_ZERO, imm);
+	} else {
+		emit(ctx, lui, dst, (s16)((u32)imm >> 16));
+		emit(ctx, ori, dst, dst, (u16)(imm & 0xffff));
+	}
+	clobber_reg(ctx, dst);
+}
+
+/* dst = src (register width) */
+void emit_mov_r(struct jit_context *ctx, u8 dst, u8 src)
+{
+	emit(ctx, ori, dst, src, 0);
+	clobber_reg(ctx, dst);
+}
+
+/* Validate ALU immediate range */
+bool valid_alu_i(u8 op, s32 imm)
+{
+	switch (BPF_OP(op)) {
+	case BPF_NEG:
+	case BPF_LSH:
+	case BPF_RSH:
+	case BPF_ARSH:
+		/* All legal eBPF values are valid */
+		return true;
+	case BPF_ADD:
+		/* imm must be 16 bits */
+		return imm >= -0x8000 && imm <= 0x7fff;
+	case BPF_SUB:
+		/* -imm must be 16 bits */
+		return imm >= -0x7fff && imm <= 0x8000;
+	case BPF_AND:
+	case BPF_OR:
+	case BPF_XOR:
+		/* imm must be 16 bits unsigned */
+		return imm >= 0 && imm <= 0xffff;
+	case BPF_MUL:
+		/* imm must be zero or a positive power of two */
+		return imm == 0 || (imm > 0 && is_power_of_2(imm));
+	case BPF_DIV:
+	case BPF_MOD:
+		/* imm must be an 17-bit power of two */
+		return (u32)imm <= 0x10000 && is_power_of_2((u32)imm);
+	}
+	return false;
+}
+
+/* Rewrite ALU immediate operation */
+bool rewrite_alu_i(u8 op, s32 imm, u8 *alu, s32 *val)
+{
+	bool act = true;
+
+	switch (BPF_OP(op)) {
+	case BPF_LSH:
+	case BPF_RSH:
+	case BPF_ARSH:
+	case BPF_ADD:
+	case BPF_SUB:
+	case BPF_OR:
+	case BPF_XOR:
+		/* imm == 0 is a no-op */
+		act = imm != 0;
+		break;
+	case BPF_MUL:
+		if (imm == 1) {
+			/* dst * 1 is a no-op */
+			act = false;
+		} else if (imm == 0) {
+			/* dst * 0 is dst & 0 */
+			op = BPF_AND;
+		} else {
+			/* dst * (1 << n) is dst << n */
+			op = BPF_LSH;
+			imm = ilog2(abs(imm));
+		}
+		break;
+	case BPF_DIV:
+		if (imm == 1) {
+			/* dst / 1 is a no-op */
+			act = false;
+		} else {
+			/* dst / (1 << n) is dst >> n */
+			op = BPF_RSH;
+			imm = ilog2(imm);
+		}
+		break;
+	case BPF_MOD:
+		/* dst % (1 << n) is dst & ((1 << n) - 1) */
+		op = BPF_AND;
+		imm--;
+		break;
+	}
+
+	*alu = op;
+	*val = imm;
+	return act;
+}
+
+/* ALU immediate operation (32-bit) */
+void emit_alu_i(struct jit_context *ctx, u8 dst, s32 imm, u8 op)
+{
+	switch (BPF_OP(op)) {
+	/* dst = -dst */
+	case BPF_NEG:
+		emit(ctx, subu, dst, MIPS_R_ZERO, dst);
+		break;
+	/* dst = dst & imm */
+	case BPF_AND:
+		emit(ctx, andi, dst, dst, (u16)imm);
+		break;
+	/* dst = dst | imm */
+	case BPF_OR:
+		emit(ctx, ori, dst, dst, (u16)imm);
+		break;
+	/* dst = dst ^ imm */
+	case BPF_XOR:
+		emit(ctx, xori, dst, dst, (u16)imm);
+		break;
+	/* dst = dst << imm */
+	case BPF_LSH:
+		emit(ctx, sll, dst, dst, imm);
+		break;
+	/* dst = dst >> imm */
+	case BPF_RSH:
+		emit(ctx, srl, dst, dst, imm);
+		break;
+	/* dst = dst >> imm (arithmetic) */
+	case BPF_ARSH:
+		emit(ctx, sra, dst, dst, imm);
+		break;
+	/* dst = dst + imm */
+	case BPF_ADD:
+		emit(ctx, addiu, dst, dst, imm);
+		break;
+	/* dst = dst - imm */
+	case BPF_SUB:
+		emit(ctx, addiu, dst, dst, -imm);
+		break;
+	}
+	clobber_reg(ctx, dst);
+}
+
+/* ALU register operation (32-bit) */
+void emit_alu_r(struct jit_context *ctx, u8 dst, u8 src, u8 op)
+{
+	switch (BPF_OP(op)) {
+	/* dst = dst & src */
+	case BPF_AND:
+		emit(ctx, and, dst, dst, src);
+		break;
+	/* dst = dst | src */
+	case BPF_OR:
+		emit(ctx, or, dst, dst, src);
+		break;
+	/* dst = dst ^ src */
+	case BPF_XOR:
+		emit(ctx, xor, dst, dst, src);
+		break;
+	/* dst = dst << src */
+	case BPF_LSH:
+		emit(ctx, sllv, dst, dst, src);
+		break;
+	/* dst = dst >> src */
+	case BPF_RSH:
+		emit(ctx, srlv, dst, dst, src);
+		break;
+	/* dst = dst >> src (arithmetic) */
+	case BPF_ARSH:
+		emit(ctx, srav, dst, dst, src);
+		break;
+	/* dst = dst + src */
+	case BPF_ADD:
+		emit(ctx, addu, dst, dst, src);
+		break;
+	/* dst = dst - src */
+	case BPF_SUB:
+		emit(ctx, subu, dst, dst, src);
+		break;
+	/* dst = dst * src */
+	case BPF_MUL:
+		if (cpu_has_mips32r1 || cpu_has_mips32r6) {
+			emit(ctx, mul, dst, dst, src);
+		} else {
+			emit(ctx, multu, dst, src);
+			emit(ctx, mflo, dst);
+		}
+		break;
+	/* dst = dst / src */
+	case BPF_DIV:
+		if (cpu_has_mips32r6) {
+			emit(ctx, divu_r6, dst, dst, src);
+		} else {
+			emit(ctx, divu, dst, src);
+			emit(ctx, mflo, dst);
+		}
+		break;
+	/* dst = dst % src */
+	case BPF_MOD:
+		if (cpu_has_mips32r6) {
+			emit(ctx, modu, dst, dst, src);
+		} else {
+			emit(ctx, divu, dst, src);
+			emit(ctx, mfhi, dst);
+		}
+		break;
+	}
+	clobber_reg(ctx, dst);
+}
+
+/* Atomic read-modify-write (32-bit) */
+void emit_atomic_r(struct jit_context *ctx, u8 dst, u8 src, s16 off, u8 code)
+{
+	LLSC_sync(ctx);
+	emit(ctx, ll, MIPS_R_T9, off, dst);
+	switch (code) {
+	case BPF_ADD:
+	case BPF_ADD | BPF_FETCH:
+		emit(ctx, addu, MIPS_R_T8, MIPS_R_T9, src);
+		break;
+	case BPF_AND:
+	case BPF_AND | BPF_FETCH:
+		emit(ctx, and, MIPS_R_T8, MIPS_R_T9, src);
+		break;
+	case BPF_OR:
+	case BPF_OR | BPF_FETCH:
+		emit(ctx, or, MIPS_R_T8, MIPS_R_T9, src);
+		break;
+	case BPF_XOR:
+	case BPF_XOR | BPF_FETCH:
+		emit(ctx, xor, MIPS_R_T8, MIPS_R_T9, src);
+		break;
+	case BPF_XCHG:
+		emit(ctx, move, MIPS_R_T8, src);
+		break;
+	}
+	emit(ctx, sc, MIPS_R_T8, off, dst);
+	emit(ctx, LLSC_beqz, MIPS_R_T8, -16 - LLSC_offset);
+	emit(ctx, nop); /* Delay slot */
+
+	if (code & BPF_FETCH) {
+		emit(ctx, move, src, MIPS_R_T9);
+		clobber_reg(ctx, src);
+	}
+}
+
+/* Atomic compare-and-exchange (32-bit) */
+void emit_cmpxchg_r(struct jit_context *ctx, u8 dst, u8 src, u8 res, s16 off)
+{
+	LLSC_sync(ctx);
+	emit(ctx, ll, MIPS_R_T9, off, dst);
+	emit(ctx, bne, MIPS_R_T9, res, 12);
+	emit(ctx, move, MIPS_R_T8, src);     /* Delay slot */
+	emit(ctx, sc, MIPS_R_T8, off, dst);
+	emit(ctx, LLSC_beqz, MIPS_R_T8, -20 - LLSC_offset);
+	emit(ctx, move, res, MIPS_R_T9);     /* Delay slot */
+	clobber_reg(ctx, res);
+}
+
+/* Swap bytes and truncate a register word or half word */
+void emit_bswap_r(struct jit_context *ctx, u8 dst, u32 width)
+{
+	u8 tmp = MIPS_R_T8;
+	u8 msk = MIPS_R_T9;
+
+	switch (width) {
+	/* Swap bytes in a word */
+	case 32:
+		if (cpu_has_mips32r2 || cpu_has_mips32r6) {
+			emit(ctx, wsbh, dst, dst);
+			emit(ctx, rotr, dst, dst, 16);
+		} else {
+			emit(ctx, sll, tmp, dst, 16);    /* tmp  = dst << 16 */
+			emit(ctx, srl, dst, dst, 16);    /* dst = dst >> 16  */
+			emit(ctx, or, dst, dst, tmp);    /* dst = dst | tmp  */
+
+			emit(ctx, lui, msk, 0xff);       /* msk = 0x00ff0000 */
+			emit(ctx, ori, msk, msk, 0xff);  /* msk = msk | 0xff */
+
+			emit(ctx, and, tmp, dst, msk);   /* tmp = dst & msk  */
+			emit(ctx, sll, tmp, tmp, 8);     /* tmp = tmp << 8   */
+			emit(ctx, srl, dst, dst, 8);     /* dst = dst >> 8   */
+			emit(ctx, and, dst, dst, msk);   /* dst = dst & msk  */
+			emit(ctx, or, dst, dst, tmp);    /* reg = dst | tmp  */
+		}
+		break;
+	/* Swap bytes in a half word */
+	case 16:
+		if (cpu_has_mips32r2 || cpu_has_mips32r6) {
+			emit(ctx, wsbh, dst, dst);
+			emit(ctx, andi, dst, dst, 0xffff);
+		} else {
+			emit(ctx, andi, tmp, dst, 0xff00); /* t = d & 0xff00 */
+			emit(ctx, srl, tmp, tmp, 8);       /* t = t >> 8     */
+			emit(ctx, andi, dst, dst, 0x00ff); /* d = d & 0x00ff */
+			emit(ctx, sll, dst, dst, 8);       /* d = d << 8     */
+			emit(ctx, or,  dst, dst, tmp);     /* d = d | t      */
+		}
+		break;
+	}
+	clobber_reg(ctx, dst);
+}
+
+/* Validate jump immediate range */
+bool valid_jmp_i(u8 op, s32 imm)
+{
+	switch (op) {
+	case JIT_JNOP:
+		/* Immediate value not used */
+		return true;
+	case BPF_JEQ:
+	case BPF_JNE:
+		/* No immediate operation */
+		return false;
+	case BPF_JSET:
+	case JIT_JNSET:
+		/* imm must be 16 bits unsigned */
+		return imm >= 0 && imm <= 0xffff;
+	case BPF_JGE:
+	case BPF_JLT:
+	case BPF_JSGE:
+	case BPF_JSLT:
+		/* imm must be 16 bits */
+		return imm >= -0x8000 && imm <= 0x7fff;
+	case BPF_JGT:
+	case BPF_JLE:
+	case BPF_JSGT:
+	case BPF_JSLE:
+		/* imm + 1 must be 16 bits */
+		return imm >= -0x8001 && imm <= 0x7ffe;
+	}
+	return false;
+}
+
+/* Invert a conditional jump operation */
+static u8 invert_jmp(u8 op)
+{
+	switch (op) {
+	case BPF_JA: return JIT_JNOP;
+	case BPF_JEQ: return BPF_JNE;
+	case BPF_JNE: return BPF_JEQ;
+	case BPF_JSET: return JIT_JNSET;
+	case BPF_JGT: return BPF_JLE;
+	case BPF_JGE: return BPF_JLT;
+	case BPF_JLT: return BPF_JGE;
+	case BPF_JLE: return BPF_JGT;
+	case BPF_JSGT: return BPF_JSLE;
+	case BPF_JSGE: return BPF_JSLT;
+	case BPF_JSLT: return BPF_JSGE;
+	case BPF_JSLE: return BPF_JSGT;
+	}
+	return 0;
+}
+
+/* Prepare a PC-relative jump operation */
+static void setup_jmp(struct jit_context *ctx, u8 bpf_op,
+		      s16 bpf_off, u8 *jit_op, s32 *jit_off)
+{
+	u32 *descp = &ctx->descriptors[ctx->bpf_index];
+	int op = bpf_op;
+	int offset = 0;
+
+	/* Do not compute offsets on the first pass */
+	if (INDEX(*descp) == 0)
+		goto done;
+
+	/* Skip jumps never taken */
+	if (bpf_op == JIT_JNOP)
+		goto done;
+
+	/* Convert jumps always taken */
+	if (bpf_op == BPF_JA)
+		*descp |= JIT_DESC_CONVERT;
+
+	/*
+	 * Current ctx->jit_index points to the start of the branch preamble.
+	 * Since the preamble differs among different branch conditionals,
+	 * the current index cannot be used to compute the branch offset.
+	 * Instead, we use the offset table value for the next instruction,
+	 * which gives the index immediately after the branch delay slot.
+	 */
+	if (!CONVERTED(*descp)) {
+		int target = ctx->bpf_index + bpf_off + 1;
+		int origin = ctx->bpf_index + 1;
+
+		offset = (INDEX(ctx->descriptors[target]) -
+			  INDEX(ctx->descriptors[origin]) + 1) * sizeof(u32);
+	}
+
+	/*
+	 * The PC-relative branch offset field on MIPS is 18 bits signed,
+	 * so if the computed offset is larger than this we generate a an
+	 * absolute jump that we skip with an inverted conditional branch.
+	 */
+	if (CONVERTED(*descp) || offset < -0x20000 || offset > 0x1ffff) {
+		offset = 3 * sizeof(u32);
+		op = invert_jmp(bpf_op);
+		ctx->changes += !CONVERTED(*descp);
+		*descp |= JIT_DESC_CONVERT;
+	}
+
+done:
+	*jit_off = offset;
+	*jit_op = op;
+}
+
+/* Prepare a PC-relative jump operation with immediate conditional */
+void setup_jmp_i(struct jit_context *ctx, s32 imm, u8 width,
+		 u8 bpf_op, s16 bpf_off, u8 *jit_op, s32 *jit_off)
+{
+	bool always = false;
+	bool never = false;
+
+	switch (bpf_op) {
+	case BPF_JEQ:
+	case BPF_JNE:
+		break;
+	case BPF_JSET:
+	case BPF_JLT:
+		never = imm == 0;
+		break;
+	case BPF_JGE:
+		always = imm == 0;
+		break;
+	case BPF_JGT:
+		never = (u32)imm == U32_MAX;
+		break;
+	case BPF_JLE:
+		always = (u32)imm == U32_MAX;
+		break;
+	case BPF_JSGT:
+		never = imm == S32_MAX && width == 32;
+		break;
+	case BPF_JSGE:
+		always = imm == S32_MIN && width == 32;
+		break;
+	case BPF_JSLT:
+		never = imm == S32_MIN && width == 32;
+		break;
+	case BPF_JSLE:
+		always = imm == S32_MAX && width == 32;
+		break;
+	}
+
+	if (never)
+		bpf_op = JIT_JNOP;
+	if (always)
+		bpf_op = BPF_JA;
+	setup_jmp(ctx, bpf_op, bpf_off, jit_op, jit_off);
+}
+
+/* Prepare a PC-relative jump operation with register conditional */
+void setup_jmp_r(struct jit_context *ctx, bool same_reg,
+		 u8 bpf_op, s16 bpf_off, u8 *jit_op, s32 *jit_off)
+{
+	switch (bpf_op) {
+	case BPF_JSET:
+		break;
+	case BPF_JEQ:
+	case BPF_JGE:
+	case BPF_JLE:
+	case BPF_JSGE:
+	case BPF_JSLE:
+		if (same_reg)
+			bpf_op = BPF_JA;
+		break;
+	case BPF_JNE:
+	case BPF_JLT:
+	case BPF_JGT:
+	case BPF_JSGT:
+	case BPF_JSLT:
+		if (same_reg)
+			bpf_op = JIT_JNOP;
+		break;
+	}
+	setup_jmp(ctx, bpf_op, bpf_off, jit_op, jit_off);
+}
+
+/* Finish a PC-relative jump operation */
+int finish_jmp(struct jit_context *ctx, u8 jit_op, s16 bpf_off)
+{
+	/* Emit conditional branch delay slot */
+	if (jit_op != JIT_JNOP)
+		emit(ctx, nop);
+	/*
+	 * Emit an absolute long jump with delay slot,
+	 * if the PC-relative branch was converted.
+	 */
+	if (CONVERTED(ctx->descriptors[ctx->bpf_index])) {
+		int target = get_target(ctx, ctx->bpf_index + bpf_off + 1);
+
+		if (target < 0)
+			return -1;
+		emit(ctx, j, target);
+		emit(ctx, nop);
+	}
+	return 0;
+}
+
+/* Jump immediate (32-bit) */
+void emit_jmp_i(struct jit_context *ctx, u8 dst, s32 imm, s32 off, u8 op)
+{
+	switch (op) {
+	/* No-op, used internally for branch optimization */
+	case JIT_JNOP:
+		break;
+	/* PC += off if dst & imm */
+	case BPF_JSET:
+		emit(ctx, andi, MIPS_R_T9, dst, (u16)imm);
+		emit(ctx, bnez, MIPS_R_T9, off);
+		break;
+	/* PC += off if (dst & imm) == 0 (not in BPF, used for long jumps) */
+	case JIT_JNSET:
+		emit(ctx, andi, MIPS_R_T9, dst, (u16)imm);
+		emit(ctx, beqz, MIPS_R_T9, off);
+		break;
+	/* PC += off if dst > imm */
+	case BPF_JGT:
+		emit(ctx, sltiu, MIPS_R_T9, dst, imm + 1);
+		emit(ctx, beqz, MIPS_R_T9, off);
+		break;
+	/* PC += off if dst >= imm */
+	case BPF_JGE:
+		emit(ctx, sltiu, MIPS_R_T9, dst, imm);
+		emit(ctx, beqz, MIPS_R_T9, off);
+		break;
+	/* PC += off if dst < imm */
+	case BPF_JLT:
+		emit(ctx, sltiu, MIPS_R_T9, dst, imm);
+		emit(ctx, bnez, MIPS_R_T9, off);
+		break;
+	/* PC += off if dst <= imm */
+	case BPF_JLE:
+		emit(ctx, sltiu, MIPS_R_T9, dst, imm + 1);
+		emit(ctx, bnez, MIPS_R_T9, off);
+		break;
+	/* PC += off if dst > imm (signed) */
+	case BPF_JSGT:
+		emit(ctx, slti, MIPS_R_T9, dst, imm + 1);
+		emit(ctx, beqz, MIPS_R_T9, off);
+		break;
+	/* PC += off if dst >= imm (signed) */
+	case BPF_JSGE:
+		emit(ctx, slti, MIPS_R_T9, dst, imm);
+		emit(ctx, beqz, MIPS_R_T9, off);
+		break;
+	/* PC += off if dst < imm (signed) */
+	case BPF_JSLT:
+		emit(ctx, slti, MIPS_R_T9, dst, imm);
+		emit(ctx, bnez, MIPS_R_T9, off);
+		break;
+	/* PC += off if dst <= imm (signed) */
+	case BPF_JSLE:
+		emit(ctx, slti, MIPS_R_T9, dst, imm + 1);
+		emit(ctx, bnez, MIPS_R_T9, off);
+		break;
+	}
+}
+
+/* Jump register (32-bit) */
+void emit_jmp_r(struct jit_context *ctx, u8 dst, u8 src, s32 off, u8 op)
+{
+	switch (op) {
+	/* No-op, used internally for branch optimization */
+	case JIT_JNOP:
+		break;
+	/* PC += off if dst == src */
+	case BPF_JEQ:
+		emit(ctx, beq, dst, src, off);
+		break;
+	/* PC += off if dst != src */
+	case BPF_JNE:
+		emit(ctx, bne, dst, src, off);
+		break;
+	/* PC += off if dst & src */
+	case BPF_JSET:
+		emit(ctx, and, MIPS_R_T9, dst, src);
+		emit(ctx, bnez, MIPS_R_T9, off);
+		break;
+	/* PC += off if (dst & imm) == 0 (not in BPF, used for long jumps) */
+	case JIT_JNSET:
+		emit(ctx, and, MIPS_R_T9, dst, src);
+		emit(ctx, beqz, MIPS_R_T9, off);
+		break;
+	/* PC += off if dst > src */
+	case BPF_JGT:
+		emit(ctx, sltu, MIPS_R_T9, src, dst);
+		emit(ctx, bnez, MIPS_R_T9, off);
+		break;
+	/* PC += off if dst >= src */
+	case BPF_JGE:
+		emit(ctx, sltu, MIPS_R_T9, dst, src);
+		emit(ctx, beqz, MIPS_R_T9, off);
+		break;
+	/* PC += off if dst < src */
+	case BPF_JLT:
+		emit(ctx, sltu, MIPS_R_T9, dst, src);
+		emit(ctx, bnez, MIPS_R_T9, off);
+		break;
+	/* PC += off if dst <= src */
+	case BPF_JLE:
+		emit(ctx, sltu, MIPS_R_T9, src, dst);
+		emit(ctx, beqz, MIPS_R_T9, off);
+		break;
+	/* PC += off if dst > src (signed) */
+	case BPF_JSGT:
+		emit(ctx, slt, MIPS_R_T9, src, dst);
+		emit(ctx, bnez, MIPS_R_T9, off);
+		break;
+	/* PC += off if dst >= src (signed) */
+	case BPF_JSGE:
+		emit(ctx, slt, MIPS_R_T9, dst, src);
+		emit(ctx, beqz, MIPS_R_T9, off);
+		break;
+	/* PC += off if dst < src (signed) */
+	case BPF_JSLT:
+		emit(ctx, slt, MIPS_R_T9, dst, src);
+		emit(ctx, bnez, MIPS_R_T9, off);
+		break;
+	/* PC += off if dst <= src (signed) */
+	case BPF_JSLE:
+		emit(ctx, slt, MIPS_R_T9, src, dst);
+		emit(ctx, beqz, MIPS_R_T9, off);
+		break;
+	}
+}
+
+/* Jump always */
+int emit_ja(struct jit_context *ctx, s16 off)
+{
+	int target = get_target(ctx, ctx->bpf_index + off + 1);
+
+	if (target < 0)
+		return -1;
+	emit(ctx, j, target);
+	emit(ctx, nop);
+	return 0;
+}
+
+/* Jump to epilogue */
+int emit_exit(struct jit_context *ctx)
+{
+	int target = get_target(ctx, ctx->program->len);
+
+	if (target < 0)
+		return -1;
+	emit(ctx, j, target);
+	emit(ctx, nop);
+	return 0;
+}
+
+/* Build the program body from eBPF bytecode */
+static int build_body(struct jit_context *ctx)
+{
+	const struct bpf_prog *prog = ctx->program;
+	unsigned int i;
+
+	ctx->stack_used = 0;
+	for (i = 0; i < prog->len; i++) {
+		const struct bpf_insn *insn = &prog->insnsi[i];
+		u32 *descp = &ctx->descriptors[i];
+		int ret;
+
+		access_reg(ctx, insn->src_reg);
+		access_reg(ctx, insn->dst_reg);
+
+		ctx->bpf_index = i;
+		if (ctx->target == NULL) {
+			ctx->changes += INDEX(*descp) != ctx->jit_index;
+			*descp &= JIT_DESC_CONVERT;
+			*descp |= ctx->jit_index;
+		}
+
+		ret = build_insn(insn, ctx);
+		if (ret < 0)
+			return ret;
+
+		if (ret > 0) {
+			i++;
+			if (ctx->target == NULL)
+				descp[1] = ctx->jit_index;
+		}
+	}
+
+	/* Store the end offset, where the epilogue begins */
+	ctx->descriptors[prog->len] = ctx->jit_index;
+	return 0;
+}
+
+/* Set the branch conversion flag on all instructions */
+static void set_convert_flag(struct jit_context *ctx, bool enable)
+{
+	const struct bpf_prog *prog = ctx->program;
+	u32 flag = enable ? JIT_DESC_CONVERT : 0;
+	unsigned int i;
+
+	for (i = 0; i <= prog->len; i++)
+		ctx->descriptors[i] = INDEX(ctx->descriptors[i]) | flag;
+}
+
+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 */
+}
+
+bool bpf_jit_needs_zext(void)
+{
+	return true;
+}
+
+struct bpf_prog *bpf_int_jit_compile(struct bpf_prog *prog)
+{
+	struct bpf_prog *tmp, *orig_prog = prog;
+	struct bpf_binary_header *header = NULL;
+	struct jit_context ctx;
+	bool tmp_blinded = false;
+	unsigned int tmp_idx;
+	unsigned int image_size;
+	u8 *image_ptr;
+	int tries;
+
+	/*
+	 * If BPF JIT was not enabled then we must fall back to
+	 * the interpreter.
+	 */
+	if (!prog->jit_requested)
+		return orig_prog;
+	/*
+	 * If constant blinding was enabled and we failed during blinding
+	 * then we must fall back to the interpreter. Otherwise, we save
+	 * the new JITed code.
+	 */
+	tmp = bpf_jit_blind_constants(prog);
+	if (IS_ERR(tmp))
+		return orig_prog;
+	if (tmp != prog) {
+		tmp_blinded = true;
+		prog = tmp;
+	}
+
+	memset(&ctx, 0, sizeof(ctx));
+	ctx.program = prog;
+
+	/*
+	 * Not able to allocate memory for descriptors[], then
+	 * we must fall back to the interpreter
+	 */
+	ctx.descriptors = kcalloc(prog->len + 1, sizeof(*ctx.descriptors),
+				  GFP_KERNEL);
+	if (ctx.descriptors == NULL)
+		goto out_err;
+
+	/* First pass discovers used resources */
+	if (build_body(&ctx) < 0)
+		goto out_err;
+	/*
+	 * Second pass computes instruction offsets.
+	 * If any PC-relative branches are out of range, a sequence of
+	 * a PC-relative branch + a jump 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.
+	 * The last two iterations are done with all branches being
+	 * converted, to guarantee offset table convergence within a
+	 * fixed number of iterations.
+	 */
+	ctx.jit_index = 0;
+	build_prologue(&ctx);
+	tmp_idx = ctx.jit_index;
+
+	tries = JIT_MAX_ITERATIONS;
+	do {
+		ctx.jit_index = tmp_idx;
+		ctx.changes = 0;
+		if (tries == 2)
+			set_convert_flag(&ctx, true);
+		if (build_body(&ctx) < 0)
+			goto out_err;
+	} while (ctx.changes > 0 && --tries > 0);
+
+	if (WARN_ONCE(ctx.changes > 0, "JIT offsets failed to converge"))
+		goto out_err;
+
+	build_epilogue(&ctx, MIPS_R_RA);
+
+	/* Now we know the size of the structure to make */
+	image_size = sizeof(u32) * ctx.jit_index;
+	header = bpf_jit_binary_alloc(image_size, &image_ptr,
+				      sizeof(u32), jit_fill_hole);
+	/*
+	 * Not able to allocate memory for the structure then
+	 * we must fall back to the interpretation
+	 */
+	if (header == NULL)
+		goto out_err;
+
+	/* Actual pass to generate final JIT code */
+	ctx.target = (u32 *)image_ptr;
+	ctx.jit_index = 0;
+
+	/*
+	 * If building the JITed code fails somehow,
+	 * we fall back to the interpretation.
+	 */
+	build_prologue(&ctx);
+	if (build_body(&ctx) < 0)
+		goto out_err;
+	build_epilogue(&ctx, MIPS_R_RA);
+
+	/* Populate line info meta data */
+	set_convert_flag(&ctx, false);
+	bpf_prog_fill_jited_linfo(prog, &ctx.descriptors[1]);
+
+	/* Set as read-only exec and flush instruction cache */
+	bpf_jit_binary_lock_ro(header);
+	flush_icache_range((unsigned long)header,
+			   (unsigned long)&ctx.target[ctx.jit_index]);
+
+	if (bpf_jit_enable > 1)
+		bpf_jit_dump(prog->len, image_size, 2, ctx.target);
+
+	prog->bpf_func = (void *)ctx.target;
+	prog->jited = 1;
+	prog->jited_len = image_size;
+
+out:
+	if (tmp_blinded)
+		bpf_jit_prog_release_other(prog, prog == orig_prog ?
+					   tmp : orig_prog);
+	kfree(ctx.descriptors);
+	return prog;
+
+out_err:
+	prog = orig_prog;
+	if (header)
+		bpf_jit_binary_free(header);
+	goto out;
+}
diff --git a/arch/mips/net/bpf_jit_comp.h b/arch/mips/net/bpf_jit_comp.h
new file mode 100644
index 000000000..a37fe2081
--- /dev/null
+++ b/arch/mips/net/bpf_jit_comp.h
@@ -0,0 +1,235 @@
+/* SPDX-License-Identifier: GPL-2.0-only */
+/*
+ * Just-In-Time compiler for eBPF bytecode on 32-bit and 64-bit MIPS.
+ *
+ * Copyright (c) 2021 Anyfi Networks AB.
+ * Author: Johan Almbladh <johan.almbladh@gmail.com>
+ *
+ * Based on code and ideas from
+ * Copyright (c) 2017 Cavium, Inc.
+ * Copyright (c) 2017 Shubham Bansal <illusionist.neo@gmail.com>
+ * Copyright (c) 2011 Mircea Gherzan <mgherzan@gmail.com>
+ */
+
+#ifndef _BPF_JIT_COMP_H
+#define _BPF_JIT_COMP_H
+
+/* MIPS registers */
+#define MIPS_R_ZERO	0   /* Const zero */
+#define MIPS_R_AT	1   /* Asm temp   */
+#define MIPS_R_V0	2   /* Result     */
+#define MIPS_R_V1	3   /* Result     */
+#define MIPS_R_A0	4   /* Argument   */
+#define MIPS_R_A1	5   /* Argument   */
+#define MIPS_R_A2	6   /* Argument   */
+#define MIPS_R_A3	7   /* Argument   */
+#define MIPS_R_A4	8   /* Arg (n64)  */
+#define MIPS_R_A5	9   /* Arg (n64)  */
+#define MIPS_R_A6	10  /* Arg (n64)  */
+#define MIPS_R_A7	11  /* Arg (n64)  */
+#define MIPS_R_T0	8   /* Temp (o32) */
+#define MIPS_R_T1	9   /* Temp (o32) */
+#define MIPS_R_T2	10  /* Temp (o32) */
+#define MIPS_R_T3	11  /* Temp (o32) */
+#define MIPS_R_T4	12  /* Temporary  */
+#define MIPS_R_T5	13  /* Temporary  */
+#define MIPS_R_T6	14  /* Temporary  */
+#define MIPS_R_T7	15  /* Temporary  */
+#define MIPS_R_S0	16  /* Saved      */
+#define MIPS_R_S1	17  /* Saved      */
+#define MIPS_R_S2	18  /* Saved      */
+#define MIPS_R_S3	19  /* Saved      */
+#define MIPS_R_S4	20  /* Saved      */
+#define MIPS_R_S5	21  /* Saved      */
+#define MIPS_R_S6	22  /* Saved      */
+#define MIPS_R_S7	23  /* Saved      */
+#define MIPS_R_T8	24  /* Temporary  */
+#define MIPS_R_T9	25  /* Temporary  */
+/*      MIPS_R_K0	26     Reserved   */
+/*      MIPS_R_K1	27     Reserved   */
+#define MIPS_R_GP	28  /* Global ptr */
+#define MIPS_R_SP	29  /* Stack ptr  */
+#define MIPS_R_FP	30  /* Frame ptr  */
+#define MIPS_R_RA	31  /* Return     */
+
+/*
+ * Jump address mask for immediate jumps. The four most significant bits
+ * must be equal to PC.
+ */
+#define MIPS_JMP_MASK	0x0fffffffUL
+
+/* Maximum number of iterations in offset table computation */
+#define JIT_MAX_ITERATIONS	8
+
+/*
+ * Jump pseudo-instructions used internally
+ * for branch conversion and branch optimization.
+ */
+#define JIT_JNSET	0xe0
+#define JIT_JNOP	0xf0
+
+/* Descriptor flag for PC-relative branch conversion */
+#define JIT_DESC_CONVERT	BIT(31)
+
+/* JIT context for an eBPF program */
+struct jit_context {
+	struct bpf_prog *program;     /* The eBPF program being JITed        */
+	u32 *descriptors;             /* eBPF to JITed CPU insn descriptors  */
+	u32 *target;                  /* JITed code buffer                   */
+	u32 bpf_index;                /* Index of current BPF program insn   */
+	u32 jit_index;                /* Index of current JIT target insn    */
+	u32 changes;                  /* Number of PC-relative branch conv   */
+	u32 accessed;                 /* Bit mask of read eBPF registers     */
+	u32 clobbered;                /* Bit mask of modified CPU registers  */
+	u32 stack_size;               /* Total allocated stack size in bytes */
+	u32 saved_size;               /* Size of callee-saved registers      */
+	u32 stack_used;               /* Stack size used for function calls  */
+};
+
+/* Emit the instruction if the JIT memory space has been allocated */
+#define __emit(ctx, func, ...)					\
+do {								\
+	if ((ctx)->target != NULL) {				\
+		u32 *p = &(ctx)->target[ctx->jit_index];	\
+		uasm_i_##func(&p, ##__VA_ARGS__);		\
+	}							\
+	(ctx)->jit_index++;					\
+} while (0)
+#define emit(...) __emit(__VA_ARGS__)
+
+/* Workaround for R10000 ll/sc errata */
+#ifdef CONFIG_WAR_R10000_LLSC
+#define LLSC_beqz	beqzl
+#else
+#define LLSC_beqz	beqz
+#endif
+
+/* Workaround for Loongson-3 ll/sc errata */
+#ifdef CONFIG_CPU_LOONGSON3_WORKAROUNDS
+#define LLSC_sync(ctx)	emit(ctx, sync, 0)
+#define LLSC_offset	4
+#else
+#define LLSC_sync(ctx)
+#define LLSC_offset	0
+#endif
+
+/* Workaround for Loongson-2F jump errata */
+#ifdef CONFIG_CPU_JUMP_WORKAROUNDS
+#define JALR_MASK	0xffffffffcfffffffULL
+#else
+#define JALR_MASK	(~0ULL)
+#endif
+
+/*
+ * Mark a BPF register as accessed, it needs to be
+ * initialized by the program if expected, e.g. FP.
+ */
+static inline void access_reg(struct jit_context *ctx, u8 reg)
+{
+	ctx->accessed |= BIT(reg);
+}
+
+/*
+ * Mark a CPU register as clobbered, it needs to be
+ * saved/restored by the program if callee-saved.
+ */
+static inline void clobber_reg(struct jit_context *ctx, u8 reg)
+{
+	ctx->clobbered |= BIT(reg);
+}
+
+/*
+ * Push registers on the stack, starting at a given depth from the stack
+ * pointer and increasing. The next depth to be written is returned.
+ */
+int push_regs(struct jit_context *ctx, u32 mask, u32 excl, int depth);
+
+/*
+ * Pop registers from the stack, starting at a given depth from the stack
+ * pointer and increasing. The next depth to be read is returned.
+ */
+int pop_regs(struct jit_context *ctx, u32 mask, u32 excl, int depth);
+
+/* Compute the 28-bit jump target address from a BPF program location */
+int get_target(struct jit_context *ctx, u32 loc);
+
+/* Compute the PC-relative offset to relative BPF program offset */
+int get_offset(const struct jit_context *ctx, int off);
+
+/* dst = imm (32-bit) */
+void emit_mov_i(struct jit_context *ctx, u8 dst, s32 imm);
+
+/* dst = src (32-bit) */
+void emit_mov_r(struct jit_context *ctx, u8 dst, u8 src);
+
+/* Validate ALU/ALU64 immediate range */
+bool valid_alu_i(u8 op, s32 imm);
+
+/* Rewrite ALU/ALU64 immediate operation */
+bool rewrite_alu_i(u8 op, s32 imm, u8 *alu, s32 *val);
+
+/* ALU immediate operation (32-bit) */
+void emit_alu_i(struct jit_context *ctx, u8 dst, s32 imm, u8 op);
+
+/* ALU register operation (32-bit) */
+void emit_alu_r(struct jit_context *ctx, u8 dst, u8 src, u8 op);
+
+/* Atomic read-modify-write (32-bit) */
+void emit_atomic_r(struct jit_context *ctx, u8 dst, u8 src, s16 off, u8 code);
+
+/* Atomic compare-and-exchange (32-bit) */
+void emit_cmpxchg_r(struct jit_context *ctx, u8 dst, u8 src, u8 res, s16 off);
+
+/* Swap bytes and truncate a register word or half word */
+void emit_bswap_r(struct jit_context *ctx, u8 dst, u32 width);
+
+/* Validate JMP/JMP32 immediate range */
+bool valid_jmp_i(u8 op, s32 imm);
+
+/* Prepare a PC-relative jump operation with immediate conditional */
+void setup_jmp_i(struct jit_context *ctx, s32 imm, u8 width,
+		 u8 bpf_op, s16 bpf_off, u8 *jit_op, s32 *jit_off);
+
+/* Prepare a PC-relative jump operation with register conditional */
+void setup_jmp_r(struct jit_context *ctx, bool same_reg,
+		 u8 bpf_op, s16 bpf_off, u8 *jit_op, s32 *jit_off);
+
+/* Finish a PC-relative jump operation */
+int finish_jmp(struct jit_context *ctx, u8 jit_op, s16 bpf_off);
+
+/* Conditional JMP/JMP32 immediate */
+void emit_jmp_i(struct jit_context *ctx, u8 dst, s32 imm, s32 off, u8 op);
+
+/* Conditional JMP/JMP32 register */
+void emit_jmp_r(struct jit_context *ctx, u8 dst, u8 src, s32 off, u8 op);
+
+/* Jump always */
+int emit_ja(struct jit_context *ctx, s16 off);
+
+/* Jump to epilogue */
+int emit_exit(struct jit_context *ctx);
+
+/*
+ * Build program prologue to set up the stack and registers.
+ * This function is implemented separately for 32-bit and 64-bit JITs.
+ */
+void build_prologue(struct jit_context *ctx);
+
+/*
+ * Build the program epilogue to restore the stack and registers.
+ * This function is implemented separately for 32-bit and 64-bit JITs.
+ */
+void build_epilogue(struct jit_context *ctx, int dest_reg);
+
+/*
+ * Convert an eBPF instruction to native instruction, i.e
+ * JITs an eBPF instruction.
+ * Returns :
+ *	0  - Successfully JITed an 8-byte eBPF instruction
+ *	>0 - Successfully JITed a 16-byte eBPF instruction
+ *	<0 - Failed to JIT.
+ * This function is implemented separately for 32-bit and 64-bit JITs.
+ */
+int build_insn(const struct bpf_insn *insn, struct jit_context *ctx);
+
+#endif /* _BPF_JIT_COMP_H */
diff --git a/arch/mips/net/bpf_jit_comp32.c b/arch/mips/net/bpf_jit_comp32.c
new file mode 100644
index 000000000..ace5db3fb
--- /dev/null
+++ b/arch/mips/net/bpf_jit_comp32.c
@@ -0,0 +1,1906 @@
+// SPDX-License-Identifier: GPL-2.0-only
+/*
+ * Just-In-Time compiler for eBPF bytecode on MIPS.
+ * Implementation of JIT functions for 32-bit CPUs.
+ *
+ * Copyright (c) 2021 Anyfi Networks AB.
+ * Author: Johan Almbladh <johan.almbladh@gmail.com>
+ *
+ * Based on code and ideas from
+ * Copyright (c) 2017 Cavium, Inc.
+ * Copyright (c) 2017 Shubham Bansal <illusionist.neo@gmail.com>
+ * Copyright (c) 2011 Mircea Gherzan <mgherzan@gmail.com>
+ */
+
+#include <linux/math64.h>
+#include <linux/errno.h>
+#include <linux/filter.h>
+#include <linux/bpf.h>
+#include <asm/cpu-features.h>
+#include <asm/isa-rev.h>
+#include <asm/uasm.h>
+
+#include "bpf_jit_comp.h"
+
+/* MIPS a4-a7 are not available in the o32 ABI */
+#undef MIPS_R_A4
+#undef MIPS_R_A5
+#undef MIPS_R_A6
+#undef MIPS_R_A7
+
+/* Stack is 8-byte aligned in o32 ABI */
+#define MIPS_STACK_ALIGNMENT 8
+
+/*
+ * The top 16 bytes of a stack frame is reserved for the callee in O32 ABI.
+ * This corresponds to stack space for register arguments a0-a3.
+ */
+#define JIT_RESERVED_STACK 16
+
+/* Temporary 64-bit register used by JIT */
+#define JIT_REG_TMP MAX_BPF_JIT_REG
+
+/*
+ * Number of prologue bytes to skip when doing a tail call.
+ * Tail call count (TCC) initialization (8 bytes) always, plus
+ * R0-to-v0 assignment (4 bytes) if big endian.
+ */
+#ifdef __BIG_ENDIAN
+#define JIT_TCALL_SKIP 12
+#else
+#define JIT_TCALL_SKIP 8
+#endif
+
+/* CPU registers holding the callee return value */
+#define JIT_RETURN_REGS	  \
+	(BIT(MIPS_R_V0) | \
+	 BIT(MIPS_R_V1))
+
+/* CPU registers arguments passed to callee directly */
+#define JIT_ARG_REGS      \
+	(BIT(MIPS_R_A0) | \
+	 BIT(MIPS_R_A1) | \
+	 BIT(MIPS_R_A2) | \
+	 BIT(MIPS_R_A3))
+
+/* CPU register arguments passed to callee on stack */
+#define JIT_STACK_REGS    \
+	(BIT(MIPS_R_T0) | \
+	 BIT(MIPS_R_T1) | \
+	 BIT(MIPS_R_T2) | \
+	 BIT(MIPS_R_T3) | \
+	 BIT(MIPS_R_T4) | \
+	 BIT(MIPS_R_T5))
+
+/* Caller-saved CPU registers */
+#define JIT_CALLER_REGS    \
+	(JIT_RETURN_REGS | \
+	 JIT_ARG_REGS    | \
+	 JIT_STACK_REGS)
+
+/* Callee-saved CPU registers */
+#define JIT_CALLEE_REGS   \
+	(BIT(MIPS_R_S0) | \
+	 BIT(MIPS_R_S1) | \
+	 BIT(MIPS_R_S2) | \
+	 BIT(MIPS_R_S3) | \
+	 BIT(MIPS_R_S4) | \
+	 BIT(MIPS_R_S5) | \
+	 BIT(MIPS_R_S6) | \
+	 BIT(MIPS_R_S7) | \
+	 BIT(MIPS_R_GP) | \
+	 BIT(MIPS_R_FP) | \
+	 BIT(MIPS_R_RA))
+
+/*
+ * Mapping of 64-bit eBPF registers to 32-bit native MIPS registers.
+ *
+ * 1) Native register pairs are ordered according to CPU endiannes, following
+ *    the MIPS convention for passing 64-bit arguments and return values.
+ * 2) The eBPF return value, arguments and callee-saved registers are mapped
+ *    to their native MIPS equivalents.
+ * 3) Since the 32 highest bits in the eBPF FP register are always zero,
+ *    only one general-purpose register is actually needed for the mapping.
+ *    We use the fp register for this purpose, and map the highest bits to
+ *    the MIPS register r0 (zero).
+ * 4) We use the MIPS gp and at registers as internal temporary registers
+ *    for constant blinding. The gp register is callee-saved.
+ * 5) One 64-bit temporary register is mapped for use when sign-extending
+ *    immediate operands. MIPS registers t6-t9 are available to the JIT
+ *    for as temporaries when implementing complex 64-bit operations.
+ *
+ * With this scheme all eBPF registers are being mapped to native MIPS
+ * registers without having to use any stack scratch space. The direct
+ * register mapping (2) simplifies the handling of function calls.
+ */
+static const u8 bpf2mips32[][2] = {
+	/* Return value from in-kernel function, and exit value from eBPF */
+	[BPF_REG_0] = {MIPS_R_V1, MIPS_R_V0},
+	/* Arguments from eBPF program to in-kernel function */
+	[BPF_REG_1] = {MIPS_R_A1, MIPS_R_A0},
+	[BPF_REG_2] = {MIPS_R_A3, MIPS_R_A2},
+	/* Remaining arguments, to be passed on the stack per O32 ABI */
+	[BPF_REG_3] = {MIPS_R_T1, MIPS_R_T0},
+	[BPF_REG_4] = {MIPS_R_T3, MIPS_R_T2},
+	[BPF_REG_5] = {MIPS_R_T5, MIPS_R_T4},
+	/* Callee-saved registers that in-kernel function will preserve */
+	[BPF_REG_6] = {MIPS_R_S1, MIPS_R_S0},
+	[BPF_REG_7] = {MIPS_R_S3, MIPS_R_S2},
+	[BPF_REG_8] = {MIPS_R_S5, MIPS_R_S4},
+	[BPF_REG_9] = {MIPS_R_S7, MIPS_R_S6},
+	/* Read-only frame pointer to access the eBPF stack */
+#ifdef __BIG_ENDIAN
+	[BPF_REG_FP] = {MIPS_R_FP, MIPS_R_ZERO},
+#else
+	[BPF_REG_FP] = {MIPS_R_ZERO, MIPS_R_FP},
+#endif
+	/* Temporary register for blinding constants */
+	[BPF_REG_AX] = {MIPS_R_GP, MIPS_R_AT},
+	/* Temporary register for internal JIT use */
+	[JIT_REG_TMP] = {MIPS_R_T7, MIPS_R_T6},
+};
+
+/* Get low CPU register for a 64-bit eBPF register mapping */
+static inline u8 lo(const u8 reg[])
+{
+#ifdef __BIG_ENDIAN
+	return reg[0];
+#else
+	return reg[1];
+#endif
+}
+
+/* Get high CPU register for a 64-bit eBPF register mapping */
+static inline u8 hi(const u8 reg[])
+{
+#ifdef __BIG_ENDIAN
+	return reg[1];
+#else
+	return reg[0];
+#endif
+}
+
+/*
+ * Mark a 64-bit CPU register pair as clobbered, it needs to be
+ * saved/restored by the program if callee-saved.
+ */
+static void clobber_reg64(struct jit_context *ctx, const u8 reg[])
+{
+	clobber_reg(ctx, reg[0]);
+	clobber_reg(ctx, reg[1]);
+}
+
+/* dst = imm (sign-extended) */
+static void emit_mov_se_i64(struct jit_context *ctx, const u8 dst[], s32 imm)
+{
+	emit_mov_i(ctx, lo(dst), imm);
+	if (imm < 0)
+		emit(ctx, addiu, hi(dst), MIPS_R_ZERO, -1);
+	else
+		emit(ctx, move, hi(dst), MIPS_R_ZERO);
+	clobber_reg64(ctx, dst);
+}
+
+/* Zero extension, if verifier does not do it for us  */
+static void emit_zext_ver(struct jit_context *ctx, const u8 dst[])
+{
+	if (!ctx->program->aux->verifier_zext) {
+		emit(ctx, move, hi(dst), MIPS_R_ZERO);
+		clobber_reg(ctx, hi(dst));
+	}
+}
+
+/* Load delay slot, if ISA mandates it */
+static void emit_load_delay(struct jit_context *ctx)
+{
+	if (!cpu_has_mips_2_3_4_5_r)
+		emit(ctx, nop);
+}
+
+/* ALU immediate operation (64-bit) */
+static void emit_alu_i64(struct jit_context *ctx,
+			 const u8 dst[], s32 imm, u8 op)
+{
+	u8 src = MIPS_R_T6;
+
+	/*
+	 * ADD/SUB with all but the max negative imm can be handled by
+	 * inverting the operation and the imm value, saving one insn.
+	 */
+	if (imm > S32_MIN && imm < 0)
+		switch (op) {
+		case BPF_ADD:
+			op = BPF_SUB;
+			imm = -imm;
+			break;
+		case BPF_SUB:
+			op = BPF_ADD;
+			imm = -imm;
+			break;
+		}
+
+	/* Move immediate to temporary register */
+	emit_mov_i(ctx, src, imm);
+
+	switch (op) {
+	/* dst = dst + imm */
+	case BPF_ADD:
+		emit(ctx, addu, lo(dst), lo(dst), src);
+		emit(ctx, sltu, MIPS_R_T9, lo(dst), src);
+		emit(ctx, addu, hi(dst), hi(dst), MIPS_R_T9);
+		if (imm < 0)
+			emit(ctx, addiu, hi(dst), hi(dst), -1);
+		break;
+	/* dst = dst - imm */
+	case BPF_SUB:
+		emit(ctx, sltu, MIPS_R_T9, lo(dst), src);
+		emit(ctx, subu, lo(dst), lo(dst), src);
+		emit(ctx, subu, hi(dst), hi(dst), MIPS_R_T9);
+		if (imm < 0)
+			emit(ctx, addiu, hi(dst), hi(dst), 1);
+		break;
+	/* dst = dst | imm */
+	case BPF_OR:
+		emit(ctx, or, lo(dst), lo(dst), src);
+		if (imm < 0)
+			emit(ctx, addiu, hi(dst), MIPS_R_ZERO, -1);
+		break;
+	/* dst = dst & imm */
+	case BPF_AND:
+		emit(ctx, and, lo(dst), lo(dst), src);
+		if (imm >= 0)
+			emit(ctx, move, hi(dst), MIPS_R_ZERO);
+		break;
+	/* dst = dst ^ imm */
+	case BPF_XOR:
+		emit(ctx, xor, lo(dst), lo(dst), src);
+		if (imm < 0) {
+			emit(ctx, subu, hi(dst), MIPS_R_ZERO, hi(dst));
+			emit(ctx, addiu, hi(dst), hi(dst), -1);
+		}
+		break;
+	}
+	clobber_reg64(ctx, dst);
+}
+
+/* ALU register operation (64-bit) */
+static void emit_alu_r64(struct jit_context *ctx,
+			 const u8 dst[], const u8 src[], u8 op)
+{
+	switch (BPF_OP(op)) {
+	/* dst = dst + src */
+	case BPF_ADD:
+		if (src == dst) {
+			emit(ctx, srl, MIPS_R_T9, lo(dst), 31);
+			emit(ctx, addu, lo(dst), lo(dst), lo(dst));
+		} else {
+			emit(ctx, addu, lo(dst), lo(dst), lo(src));
+			emit(ctx, sltu, MIPS_R_T9, lo(dst), lo(src));
+		}
+		emit(ctx, addu, hi(dst), hi(dst), hi(src));
+		emit(ctx, addu, hi(dst), hi(dst), MIPS_R_T9);
+		break;
+	/* dst = dst - src */
+	case BPF_SUB:
+		emit(ctx, sltu, MIPS_R_T9, lo(dst), lo(src));
+		emit(ctx, subu, lo(dst), lo(dst), lo(src));
+		emit(ctx, subu, hi(dst), hi(dst), hi(src));
+		emit(ctx, subu, hi(dst), hi(dst), MIPS_R_T9);
+		break;
+	/* dst = dst | src */
+	case BPF_OR:
+		emit(ctx, or, lo(dst), lo(dst), lo(src));
+		emit(ctx, or, hi(dst), hi(dst), hi(src));
+		break;
+	/* dst = dst & src */
+	case BPF_AND:
+		emit(ctx, and, lo(dst), lo(dst), lo(src));
+		emit(ctx, and, hi(dst), hi(dst), hi(src));
+		break;
+	/* dst = dst ^ src */
+	case BPF_XOR:
+		emit(ctx, xor, lo(dst), lo(dst), lo(src));
+		emit(ctx, xor, hi(dst), hi(dst), hi(src));
+		break;
+	}
+	clobber_reg64(ctx, dst);
+}
+
+/* ALU invert (64-bit) */
+static void emit_neg_i64(struct jit_context *ctx, const u8 dst[])
+{
+	emit(ctx, sltu, MIPS_R_T9, MIPS_R_ZERO, lo(dst));
+	emit(ctx, subu, lo(dst), MIPS_R_ZERO, lo(dst));
+	emit(ctx, subu, hi(dst), MIPS_R_ZERO, hi(dst));
+	emit(ctx, subu, hi(dst), hi(dst), MIPS_R_T9);
+
+	clobber_reg64(ctx, dst);
+}
+
+/* ALU shift immediate (64-bit) */
+static void emit_shift_i64(struct jit_context *ctx,
+			   const u8 dst[], u32 imm, u8 op)
+{
+	switch (BPF_OP(op)) {
+	/* dst = dst << imm */
+	case BPF_LSH:
+		if (imm < 32) {
+			emit(ctx, srl, MIPS_R_T9, lo(dst), 32 - imm);
+			emit(ctx, sll, lo(dst), lo(dst), imm);
+			emit(ctx, sll, hi(dst), hi(dst), imm);
+			emit(ctx, or, hi(dst), hi(dst), MIPS_R_T9);
+		} else {
+			emit(ctx, sll, hi(dst), lo(dst), imm - 32);
+			emit(ctx, move, lo(dst), MIPS_R_ZERO);
+		}
+		break;
+	/* dst = dst >> imm */
+	case BPF_RSH:
+		if (imm < 32) {
+			emit(ctx, sll, MIPS_R_T9, hi(dst), 32 - imm);
+			emit(ctx, srl, lo(dst), lo(dst), imm);
+			emit(ctx, srl, hi(dst), hi(dst), imm);
+			emit(ctx, or, lo(dst), lo(dst), MIPS_R_T9);
+		} else {
+			emit(ctx, srl, lo(dst), hi(dst), imm - 32);
+			emit(ctx, move, hi(dst), MIPS_R_ZERO);
+		}
+		break;
+	/* dst = dst >> imm (arithmetic) */
+	case BPF_ARSH:
+		if (imm < 32) {
+			emit(ctx, sll, MIPS_R_T9, hi(dst), 32 - imm);
+			emit(ctx, srl, lo(dst), lo(dst), imm);
+			emit(ctx, sra, hi(dst), hi(dst), imm);
+			emit(ctx, or, lo(dst), lo(dst), MIPS_R_T9);
+		} else {
+			emit(ctx, sra, lo(dst), hi(dst), imm - 32);
+			emit(ctx, sra, hi(dst), hi(dst), 31);
+		}
+		break;
+	}
+	clobber_reg64(ctx, dst);
+}
+
+/* ALU shift register (64-bit) */
+static void emit_shift_r64(struct jit_context *ctx,
+			   const u8 dst[], u8 src, u8 op)
+{
+	u8 t1 = MIPS_R_T8;
+	u8 t2 = MIPS_R_T9;
+
+	emit(ctx, andi, t1, src, 32);              /* t1 = src & 32          */
+	emit(ctx, beqz, t1, 16);                   /* PC += 16 if t1 == 0    */
+	emit(ctx, nor, t2, src, MIPS_R_ZERO);      /* t2 = ~src (delay slot) */
+
+	switch (BPF_OP(op)) {
+	/* dst = dst << src */
+	case BPF_LSH:
+		/* Next: shift >= 32 */
+		emit(ctx, sllv, hi(dst), lo(dst), src);    /* dh = dl << src */
+		emit(ctx, move, lo(dst), MIPS_R_ZERO);     /* dl = 0         */
+		emit(ctx, b, 20);                          /* PC += 20       */
+		/* +16: shift < 32 */
+		emit(ctx, srl, t1, lo(dst), 1);            /* t1 = dl >> 1   */
+		emit(ctx, srlv, t1, t1, t2);               /* t1 = t1 >> t2  */
+		emit(ctx, sllv, lo(dst), lo(dst), src);    /* dl = dl << src */
+		emit(ctx, sllv, hi(dst), hi(dst), src);    /* dh = dh << src */
+		emit(ctx, or, hi(dst), hi(dst), t1);       /* dh = dh | t1   */
+		break;
+	/* dst = dst >> src */
+	case BPF_RSH:
+		/* Next: shift >= 32 */
+		emit(ctx, srlv, lo(dst), hi(dst), src);    /* dl = dh >> src */
+		emit(ctx, move, hi(dst), MIPS_R_ZERO);     /* dh = 0         */
+		emit(ctx, b, 20);                          /* PC += 20       */
+		/* +16: shift < 32 */
+		emit(ctx, sll, t1, hi(dst), 1);            /* t1 = dl << 1   */
+		emit(ctx, sllv, t1, t1, t2);               /* t1 = t1 << t2  */
+		emit(ctx, srlv, lo(dst), lo(dst), src);    /* dl = dl >> src */
+		emit(ctx, srlv, hi(dst), hi(dst), src);    /* dh = dh >> src */
+		emit(ctx, or, lo(dst), lo(dst), t1);       /* dl = dl | t1   */
+		break;
+	/* dst = dst >> src (arithmetic) */
+	case BPF_ARSH:
+		/* Next: shift >= 32 */
+		emit(ctx, srav, lo(dst), hi(dst), src);   /* dl = dh >>a src */
+		emit(ctx, sra, hi(dst), hi(dst), 31);     /* dh = dh >>a 31  */
+		emit(ctx, b, 20);                         /* PC += 20        */
+		/* +16: shift < 32 */
+		emit(ctx, sll, t1, hi(dst), 1);           /* t1 = dl << 1    */
+		emit(ctx, sllv, t1, t1, t2);              /* t1 = t1 << t2   */
+		emit(ctx, srlv, lo(dst), lo(dst), src);   /* dl = dl >>a src */
+		emit(ctx, srav, hi(dst), hi(dst), src);   /* dh = dh >> src  */
+		emit(ctx, or, lo(dst), lo(dst), t1);      /* dl = dl | t1    */
+		break;
+	}
+
+	/* +20: Done */
+	clobber_reg64(ctx, dst);
+}
+
+/* ALU mul immediate (64x32-bit) */
+static void emit_mul_i64(struct jit_context *ctx, const u8 dst[], s32 imm)
+{
+	u8 src = MIPS_R_T6;
+	u8 tmp = MIPS_R_T9;
+
+	switch (imm) {
+	/* dst = dst * 1 is a no-op */
+	case 1:
+		break;
+	/* dst = dst * -1 */
+	case -1:
+		emit_neg_i64(ctx, dst);
+		break;
+	case 0:
+		emit_mov_r(ctx, lo(dst), MIPS_R_ZERO);
+		emit_mov_r(ctx, hi(dst), MIPS_R_ZERO);
+		break;
+	/* Full 64x32 multiply */
+	default:
+		/* hi(dst) = hi(dst) * src(imm) */
+		emit_mov_i(ctx, src, imm);
+		if (cpu_has_mips32r1 || cpu_has_mips32r6) {
+			emit(ctx, mul, hi(dst), hi(dst), src);
+		} else {
+			emit(ctx, multu, hi(dst), src);
+			emit(ctx, mflo, hi(dst));
+		}
+
+		/* hi(dst) = hi(dst) - lo(dst) */
+		if (imm < 0)
+			emit(ctx, subu, hi(dst), hi(dst), lo(dst));
+
+		/* tmp = lo(dst) * src(imm) >> 32 */
+		/* lo(dst) = lo(dst) * src(imm) */
+		if (cpu_has_mips32r6) {
+			emit(ctx, muhu, tmp, lo(dst), src);
+			emit(ctx, mulu, lo(dst), lo(dst), src);
+		} else {
+			emit(ctx, multu, lo(dst), src);
+			emit(ctx, mflo, lo(dst));
+			emit(ctx, mfhi, tmp);
+		}
+
+		/* hi(dst) += tmp */
+		emit(ctx, addu, hi(dst), hi(dst), tmp);
+		clobber_reg64(ctx, dst);
+		break;
+	}
+}
+
+/* ALU mul register (64x64-bit) */
+static void emit_mul_r64(struct jit_context *ctx,
+			 const u8 dst[], const u8 src[])
+{
+	u8 acc = MIPS_R_T8;
+	u8 tmp = MIPS_R_T9;
+
+	/* acc = hi(dst) * lo(src) */
+	if (cpu_has_mips32r1 || cpu_has_mips32r6) {
+		emit(ctx, mul, acc, hi(dst), lo(src));
+	} else {
+		emit(ctx, multu, hi(dst), lo(src));
+		emit(ctx, mflo, acc);
+	}
+
+	/* tmp = lo(dst) * hi(src) */
+	if (cpu_has_mips32r1 || cpu_has_mips32r6) {
+		emit(ctx, mul, tmp, lo(dst), hi(src));
+	} else {
+		emit(ctx, multu, lo(dst), hi(src));
+		emit(ctx, mflo, tmp);
+	}
+
+	/* acc += tmp */
+	emit(ctx, addu, acc, acc, tmp);
+
+	/* tmp = lo(dst) * lo(src) >> 32 */
+	/* lo(dst) = lo(dst) * lo(src) */
+	if (cpu_has_mips32r6) {
+		emit(ctx, muhu, tmp, lo(dst), lo(src));
+		emit(ctx, mulu, lo(dst), lo(dst), lo(src));
+	} else {
+		emit(ctx, multu, lo(dst), lo(src));
+		emit(ctx, mflo, lo(dst));
+		emit(ctx, mfhi, tmp);
+	}
+
+	/* hi(dst) = acc + tmp */
+	emit(ctx, addu, hi(dst), acc, tmp);
+	clobber_reg64(ctx, dst);
+}
+
+/* Helper function for 64-bit modulo */
+static u64 jit_mod64(u64 a, u64 b)
+{
+	u64 rem;
+
+	div64_u64_rem(a, b, &rem);
+	return rem;
+}
+
+/* ALU div/mod register (64-bit) */
+static void emit_divmod_r64(struct jit_context *ctx,
+			    const u8 dst[], const u8 src[], u8 op)
+{
+	const u8 *r0 = bpf2mips32[BPF_REG_0]; /* Mapped to v0-v1 */
+	const u8 *r1 = bpf2mips32[BPF_REG_1]; /* Mapped to a0-a1 */
+	const u8 *r2 = bpf2mips32[BPF_REG_2]; /* Mapped to a2-a3 */
+	int exclude, k;
+	u32 addr = 0;
+
+	/* Push caller-saved registers on stack */
+	push_regs(ctx, ctx->clobbered & JIT_CALLER_REGS,
+		  0, JIT_RESERVED_STACK);
+
+	/* Put 64-bit arguments 1 and 2 in registers a0-a3 */
+	for (k = 0; k < 2; k++) {
+		emit(ctx, move, MIPS_R_T9, src[k]);
+		emit(ctx, move, r1[k], dst[k]);
+		emit(ctx, move, r2[k], MIPS_R_T9);
+	}
+
+	/* Emit function call */
+	switch (BPF_OP(op)) {
+	/* dst = dst / src */
+	case BPF_DIV:
+		addr = (u32)&div64_u64;
+		break;
+	/* dst = dst % src */
+	case BPF_MOD:
+		addr = (u32)&jit_mod64;
+		break;
+	}
+	emit_mov_i(ctx, MIPS_R_T9, addr);
+	emit(ctx, jalr, MIPS_R_RA, MIPS_R_T9);
+	emit(ctx, nop); /* Delay slot */
+
+	/* Store the 64-bit result in dst */
+	emit(ctx, move, dst[0], r0[0]);
+	emit(ctx, move, dst[1], r0[1]);
+
+	/* Restore caller-saved registers, excluding the computed result */
+	exclude = BIT(lo(dst)) | BIT(hi(dst));
+	pop_regs(ctx, ctx->clobbered & JIT_CALLER_REGS,
+		 exclude, JIT_RESERVED_STACK);
+	emit_load_delay(ctx);
+
+	clobber_reg64(ctx, dst);
+	clobber_reg(ctx, MIPS_R_V0);
+	clobber_reg(ctx, MIPS_R_V1);
+	clobber_reg(ctx, MIPS_R_RA);
+}
+
+/* Swap bytes in a register word */
+static void emit_swap8_r(struct jit_context *ctx, u8 dst, u8 src, u8 mask)
+{
+	u8 tmp = MIPS_R_T9;
+
+	emit(ctx, and, tmp, src, mask); /* tmp = src & 0x00ff00ff */
+	emit(ctx, sll, tmp, tmp, 8);    /* tmp = tmp << 8         */
+	emit(ctx, srl, dst, src, 8);    /* dst = src >> 8         */
+	emit(ctx, and, dst, dst, mask); /* dst = dst & 0x00ff00ff */
+	emit(ctx, or,  dst, dst, tmp);  /* dst = dst | tmp        */
+}
+
+/* Swap half words in a register word */
+static void emit_swap16_r(struct jit_context *ctx, u8 dst, u8 src)
+{
+	u8 tmp = MIPS_R_T9;
+
+	emit(ctx, sll, tmp, src, 16);  /* tmp = src << 16 */
+	emit(ctx, srl, dst, src, 16);  /* dst = src >> 16 */
+	emit(ctx, or,  dst, dst, tmp); /* dst = dst | tmp */
+}
+
+/* Swap bytes and truncate a register double word, word or half word */
+static void emit_bswap_r64(struct jit_context *ctx, const u8 dst[], u32 width)
+{
+	u8 tmp = MIPS_R_T8;
+
+	switch (width) {
+	/* Swap bytes in a double word */
+	case 64:
+		if (cpu_has_mips32r2 || cpu_has_mips32r6) {
+			emit(ctx, rotr, tmp, hi(dst), 16);
+			emit(ctx, rotr, hi(dst), lo(dst), 16);
+			emit(ctx, wsbh, lo(dst), tmp);
+			emit(ctx, wsbh, hi(dst), hi(dst));
+		} else {
+			emit_swap16_r(ctx, tmp, lo(dst));
+			emit_swap16_r(ctx, lo(dst), hi(dst));
+			emit(ctx, move, hi(dst), tmp);
+
+			emit(ctx, lui, tmp, 0xff);      /* tmp = 0x00ff0000 */
+			emit(ctx, ori, tmp, tmp, 0xff); /* tmp = 0x00ff00ff */
+			emit_swap8_r(ctx, lo(dst), lo(dst), tmp);
+			emit_swap8_r(ctx, hi(dst), hi(dst), tmp);
+		}
+		break;
+	/* Swap bytes in a word */
+	/* Swap bytes in a half word */
+	case 32:
+	case 16:
+		emit_bswap_r(ctx, lo(dst), width);
+		emit(ctx, move, hi(dst), MIPS_R_ZERO);
+		break;
+	}
+	clobber_reg64(ctx, dst);
+}
+
+/* Truncate a register double word, word or half word */
+static void emit_trunc_r64(struct jit_context *ctx, const u8 dst[], u32 width)
+{
+	switch (width) {
+	case 64:
+		break;
+	/* Zero-extend a word */
+	case 32:
+		emit(ctx, move, hi(dst), MIPS_R_ZERO);
+		clobber_reg(ctx, hi(dst));
+		break;
+	/* Zero-extend a half word */
+	case 16:
+		emit(ctx, move, hi(dst), MIPS_R_ZERO);
+		emit(ctx, andi, lo(dst), lo(dst), 0xffff);
+		clobber_reg64(ctx, dst);
+		break;
+	}
+}
+
+/* Load operation: dst = *(size*)(src + off) */
+static void emit_ldx(struct jit_context *ctx,
+		     const u8 dst[], u8 src, s16 off, u8 size)
+{
+	switch (size) {
+	/* Load a byte */
+	case BPF_B:
+		emit(ctx, lbu, lo(dst), off, src);
+		emit(ctx, move, hi(dst), MIPS_R_ZERO);
+		break;
+	/* Load a half word */
+	case BPF_H:
+		emit(ctx, lhu, lo(dst), off, src);
+		emit(ctx, move, hi(dst), MIPS_R_ZERO);
+		break;
+	/* Load a word */
+	case BPF_W:
+		emit(ctx, lw, lo(dst), off, src);
+		emit(ctx, move, hi(dst), MIPS_R_ZERO);
+		break;
+	/* Load a double word */
+	case BPF_DW:
+		if (dst[1] == src) {
+			emit(ctx, lw, dst[0], off + 4, src);
+			emit(ctx, lw, dst[1], off, src);
+		} else {
+			emit(ctx, lw, dst[1], off, src);
+			emit(ctx, lw, dst[0], off + 4, src);
+		}
+		emit_load_delay(ctx);
+		break;
+	}
+	clobber_reg64(ctx, dst);
+}
+
+/* Store operation: *(size *)(dst + off) = src */
+static void emit_stx(struct jit_context *ctx,
+		     const u8 dst, const u8 src[], s16 off, u8 size)
+{
+	switch (size) {
+	/* Store a byte */
+	case BPF_B:
+		emit(ctx, sb, lo(src), off, dst);
+		break;
+	/* Store a half word */
+	case BPF_H:
+		emit(ctx, sh, lo(src), off, dst);
+		break;
+	/* Store a word */
+	case BPF_W:
+		emit(ctx, sw, lo(src), off, dst);
+		break;
+	/* Store a double word */
+	case BPF_DW:
+		emit(ctx, sw, src[1], off, dst);
+		emit(ctx, sw, src[0], off + 4, dst);
+		break;
+	}
+}
+
+/* Atomic read-modify-write (32-bit, non-ll/sc fallback) */
+static void emit_atomic_r32(struct jit_context *ctx,
+			    u8 dst, u8 src, s16 off, u8 code)
+{
+	u32 exclude = 0;
+	u32 addr = 0;
+
+	/* Push caller-saved registers on stack */
+	push_regs(ctx, ctx->clobbered & JIT_CALLER_REGS,
+		  0, JIT_RESERVED_STACK);
+	/*
+	 * Argument 1: dst+off if xchg, otherwise src, passed in register a0
+	 * Argument 2: src if xchg, otherwise dst+off, passed in register a1
+	 */
+	emit(ctx, move, MIPS_R_T9, dst);
+	if (code == BPF_XCHG) {
+		emit(ctx, move, MIPS_R_A1, src);
+		emit(ctx, addiu, MIPS_R_A0, MIPS_R_T9, off);
+	} else {
+		emit(ctx, move, MIPS_R_A0, src);
+		emit(ctx, addiu, MIPS_R_A1, MIPS_R_T9, off);
+	}
+
+	/* Emit function call */
+	switch (code) {
+	case BPF_ADD:
+		addr = (u32)&atomic_add;
+		break;
+	case BPF_ADD | BPF_FETCH:
+		addr = (u32)&atomic_fetch_add;
+		break;
+	case BPF_SUB:
+		addr = (u32)&atomic_sub;
+		break;
+	case BPF_SUB | BPF_FETCH:
+		addr = (u32)&atomic_fetch_sub;
+		break;
+	case BPF_OR:
+		addr = (u32)&atomic_or;
+		break;
+	case BPF_OR | BPF_FETCH:
+		addr = (u32)&atomic_fetch_or;
+		break;
+	case BPF_AND:
+		addr = (u32)&atomic_and;
+		break;
+	case BPF_AND | BPF_FETCH:
+		addr = (u32)&atomic_fetch_and;
+		break;
+	case BPF_XOR:
+		addr = (u32)&atomic_xor;
+		break;
+	case BPF_XOR | BPF_FETCH:
+		addr = (u32)&atomic_fetch_xor;
+		break;
+	case BPF_XCHG:
+		addr = (u32)&atomic_xchg;
+		break;
+	}
+	emit_mov_i(ctx, MIPS_R_T9, addr);
+	emit(ctx, jalr, MIPS_R_RA, MIPS_R_T9);
+	emit(ctx, nop); /* Delay slot */
+
+	/* Update src register with old value, if specified */
+	if (code & BPF_FETCH) {
+		emit(ctx, move, src, MIPS_R_V0);
+		exclude = BIT(src);
+		clobber_reg(ctx, src);
+	}
+
+	/* Restore caller-saved registers, except any fetched value */
+	pop_regs(ctx, ctx->clobbered & JIT_CALLER_REGS,
+		 exclude, JIT_RESERVED_STACK);
+	emit_load_delay(ctx);
+	clobber_reg(ctx, MIPS_R_RA);
+}
+
+/* Helper function for 64-bit atomic exchange */
+static s64 jit_xchg64(s64 a, atomic64_t *v)
+{
+	return atomic64_xchg(v, a);
+}
+
+/* Atomic read-modify-write (64-bit) */
+static void emit_atomic_r64(struct jit_context *ctx,
+			    u8 dst, const u8 src[], s16 off, u8 code)
+{
+	const u8 *r0 = bpf2mips32[BPF_REG_0]; /* Mapped to v0-v1 */
+	const u8 *r1 = bpf2mips32[BPF_REG_1]; /* Mapped to a0-a1 */
+	u32 exclude = 0;
+	u32 addr = 0;
+
+	/* Push caller-saved registers on stack */
+	push_regs(ctx, ctx->clobbered & JIT_CALLER_REGS,
+		  0, JIT_RESERVED_STACK);
+	/*
+	 * Argument 1: 64-bit src, passed in registers a0-a1
+	 * Argument 2: 32-bit dst+off, passed in register a2
+	 */
+	emit(ctx, move, MIPS_R_T9, dst);
+	emit(ctx, move, r1[0], src[0]);
+	emit(ctx, move, r1[1], src[1]);
+	emit(ctx, addiu, MIPS_R_A2, MIPS_R_T9, off);
+
+	/* Emit function call */
+	switch (code) {
+	case BPF_ADD:
+		addr = (u32)&atomic64_add;
+		break;
+	case BPF_ADD | BPF_FETCH:
+		addr = (u32)&atomic64_fetch_add;
+		break;
+	case BPF_SUB:
+		addr = (u32)&atomic64_sub;
+		break;
+	case BPF_SUB | BPF_FETCH:
+		addr = (u32)&atomic64_fetch_sub;
+		break;
+	case BPF_OR:
+		addr = (u32)&atomic64_or;
+		break;
+	case BPF_OR | BPF_FETCH:
+		addr = (u32)&atomic64_fetch_or;
+		break;
+	case BPF_AND:
+		addr = (u32)&atomic64_and;
+		break;
+	case BPF_AND | BPF_FETCH:
+		addr = (u32)&atomic64_fetch_and;
+		break;
+	case BPF_XOR:
+		addr = (u32)&atomic64_xor;
+		break;
+	case BPF_XOR | BPF_FETCH:
+		addr = (u32)&atomic64_fetch_xor;
+		break;
+	case BPF_XCHG:
+		addr = (u32)&jit_xchg64;
+		break;
+	}
+	emit_mov_i(ctx, MIPS_R_T9, addr);
+	emit(ctx, jalr, MIPS_R_RA, MIPS_R_T9);
+	emit(ctx, nop); /* Delay slot */
+
+	/* Update src register with old value, if specified */
+	if (code & BPF_FETCH) {
+		emit(ctx, move, lo(src), lo(r0));
+		emit(ctx, move, hi(src), hi(r0));
+		exclude = BIT(src[0]) | BIT(src[1]);
+		clobber_reg64(ctx, src);
+	}
+
+	/* Restore caller-saved registers, except any fetched value */
+	pop_regs(ctx, ctx->clobbered & JIT_CALLER_REGS,
+		 exclude, JIT_RESERVED_STACK);
+	emit_load_delay(ctx);
+	clobber_reg(ctx, MIPS_R_RA);
+}
+
+/* Atomic compare-and-exchange (32-bit, non-ll/sc fallback) */
+static void emit_cmpxchg_r32(struct jit_context *ctx, u8 dst, u8 src, s16 off)
+{
+	const u8 *r0 = bpf2mips32[BPF_REG_0];
+
+	/* Push caller-saved registers on stack */
+	push_regs(ctx, ctx->clobbered & JIT_CALLER_REGS,
+		  JIT_RETURN_REGS, JIT_RESERVED_STACK + 2 * sizeof(u32));
+	/*
+	 * Argument 1: 32-bit dst+off, passed in register a0
+	 * Argument 2: 32-bit r0, passed in register a1
+	 * Argument 3: 32-bit src, passed in register a2
+	 */
+	emit(ctx, addiu, MIPS_R_T9, dst, off);
+	emit(ctx, move, MIPS_R_T8, src);
+	emit(ctx, move, MIPS_R_A1, lo(r0));
+	emit(ctx, move, MIPS_R_A0, MIPS_R_T9);
+	emit(ctx, move, MIPS_R_A2, MIPS_R_T8);
+
+	/* Emit function call */
+	emit_mov_i(ctx, MIPS_R_T9, (u32)&atomic_cmpxchg);
+	emit(ctx, jalr, MIPS_R_RA, MIPS_R_T9);
+	emit(ctx, nop); /* Delay slot */
+
+#ifdef __BIG_ENDIAN
+	emit(ctx, move, lo(r0), MIPS_R_V0);
+#endif
+	/* Restore caller-saved registers, except the return value */
+	pop_regs(ctx, ctx->clobbered & JIT_CALLER_REGS,
+		 JIT_RETURN_REGS, JIT_RESERVED_STACK + 2 * sizeof(u32));
+	emit_load_delay(ctx);
+	clobber_reg(ctx, MIPS_R_V0);
+	clobber_reg(ctx, MIPS_R_V1);
+	clobber_reg(ctx, MIPS_R_RA);
+}
+
+/* Atomic compare-and-exchange (64-bit) */
+static void emit_cmpxchg_r64(struct jit_context *ctx,
+			     u8 dst, const u8 src[], s16 off)
+{
+	const u8 *r0 = bpf2mips32[BPF_REG_0];
+	const u8 *r2 = bpf2mips32[BPF_REG_2];
+
+	/* Push caller-saved registers on stack */
+	push_regs(ctx, ctx->clobbered & JIT_CALLER_REGS,
+		  JIT_RETURN_REGS, JIT_RESERVED_STACK + 2 * sizeof(u32));
+	/*
+	 * Argument 1: 32-bit dst+off, passed in register a0 (a1 unused)
+	 * Argument 2: 64-bit r0, passed in registers a2-a3
+	 * Argument 3: 64-bit src, passed on stack
+	 */
+	push_regs(ctx, BIT(src[0]) | BIT(src[1]), 0, JIT_RESERVED_STACK);
+	emit(ctx, addiu, MIPS_R_T9, dst, off);
+	emit(ctx, move, r2[0], r0[0]);
+	emit(ctx, move, r2[1], r0[1]);
+	emit(ctx, move, MIPS_R_A0, MIPS_R_T9);
+
+	/* Emit function call */
+	emit_mov_i(ctx, MIPS_R_T9, (u32)&atomic64_cmpxchg);
+	emit(ctx, jalr, MIPS_R_RA, MIPS_R_T9);
+	emit(ctx, nop); /* Delay slot */
+
+	/* Restore caller-saved registers, except the return value */
+	pop_regs(ctx, ctx->clobbered & JIT_CALLER_REGS,
+		 JIT_RETURN_REGS, JIT_RESERVED_STACK + 2 * sizeof(u32));
+	emit_load_delay(ctx);
+	clobber_reg(ctx, MIPS_R_V0);
+	clobber_reg(ctx, MIPS_R_V1);
+	clobber_reg(ctx, MIPS_R_RA);
+}
+
+/*
+ * Conditional movz or an emulated equivalent.
+ * Note that the rs register may be modified.
+ */
+static void emit_movz_r(struct jit_context *ctx, u8 rd, u8 rs, u8 rt)
+{
+	if (cpu_has_mips_2) {
+		emit(ctx, movz, rd, rs, rt);           /* rd = rt ? rd : rs  */
+	} else if (cpu_has_mips32r6) {
+		if (rs != MIPS_R_ZERO)
+			emit(ctx, seleqz, rs, rs, rt); /* rs = 0 if rt == 0  */
+		emit(ctx, selnez, rd, rd, rt);         /* rd = 0 if rt != 0  */
+		if (rs != MIPS_R_ZERO)
+			emit(ctx, or, rd, rd, rs);     /* rd = rd | rs       */
+	} else {
+		emit(ctx, bnez, rt, 8);                /* PC += 8 if rd != 0 */
+		emit(ctx, nop);                        /* +0: delay slot     */
+		emit(ctx, or, rd, rs, MIPS_R_ZERO);    /* +4: rd = rs        */
+	}
+	clobber_reg(ctx, rd);
+	clobber_reg(ctx, rs);
+}
+
+/*
+ * Conditional movn or an emulated equivalent.
+ * Note that the rs register may be modified.
+ */
+static void emit_movn_r(struct jit_context *ctx, u8 rd, u8 rs, u8 rt)
+{
+	if (cpu_has_mips_2) {
+		emit(ctx, movn, rd, rs, rt);           /* rd = rt ? rs : rd  */
+	} else if (cpu_has_mips32r6) {
+		if (rs != MIPS_R_ZERO)
+			emit(ctx, selnez, rs, rs, rt); /* rs = 0 if rt == 0  */
+		emit(ctx, seleqz, rd, rd, rt);         /* rd = 0 if rt != 0  */
+		if (rs != MIPS_R_ZERO)
+			emit(ctx, or, rd, rd, rs);     /* rd = rd | rs       */
+	} else {
+		emit(ctx, beqz, rt, 8);                /* PC += 8 if rd == 0 */
+		emit(ctx, nop);                        /* +0: delay slot     */
+		emit(ctx, or, rd, rs, MIPS_R_ZERO);    /* +4: rd = rs        */
+	}
+	clobber_reg(ctx, rd);
+	clobber_reg(ctx, rs);
+}
+
+/* Emulation of 64-bit sltiu rd, rs, imm, where imm may be S32_MAX + 1 */
+static void emit_sltiu_r64(struct jit_context *ctx, u8 rd,
+			   const u8 rs[], s64 imm)
+{
+	u8 tmp = MIPS_R_T9;
+
+	if (imm < 0) {
+		emit_mov_i(ctx, rd, imm);                 /* rd = imm        */
+		emit(ctx, sltu, rd, lo(rs), rd);          /* rd = rsl < rd   */
+		emit(ctx, sltiu, tmp, hi(rs), -1);        /* tmp = rsh < ~0U */
+		emit(ctx, or, rd, rd, tmp);               /* rd = rd | tmp   */
+	} else { /* imm >= 0 */
+		if (imm > 0x7fff) {
+			emit_mov_i(ctx, rd, (s32)imm);     /* rd = imm       */
+			emit(ctx, sltu, rd, lo(rs), rd);   /* rd = rsl < rd  */
+		} else {
+			emit(ctx, sltiu, rd, lo(rs), imm); /* rd = rsl < imm */
+		}
+		emit_movn_r(ctx, rd, MIPS_R_ZERO, hi(rs)); /* rd = 0 if rsh  */
+	}
+}
+
+/* Emulation of 64-bit sltu rd, rs, rt */
+static void emit_sltu_r64(struct jit_context *ctx, u8 rd,
+			  const u8 rs[], const u8 rt[])
+{
+	u8 tmp = MIPS_R_T9;
+
+	emit(ctx, sltu, rd, lo(rs), lo(rt));           /* rd = rsl < rtl     */
+	emit(ctx, subu, tmp, hi(rs), hi(rt));          /* tmp = rsh - rth    */
+	emit_movn_r(ctx, rd, MIPS_R_ZERO, tmp);        /* rd = 0 if tmp != 0 */
+	emit(ctx, sltu, tmp, hi(rs), hi(rt));          /* tmp = rsh < rth    */
+	emit(ctx, or, rd, rd, tmp);                    /* rd = rd | tmp      */
+}
+
+/* Emulation of 64-bit slti rd, rs, imm, where imm may be S32_MAX + 1 */
+static void emit_slti_r64(struct jit_context *ctx, u8 rd,
+			  const u8 rs[], s64 imm)
+{
+	u8 t1 = MIPS_R_T8;
+	u8 t2 = MIPS_R_T9;
+	u8 cmp;
+
+	/*
+	 * if ((rs < 0) ^ (imm < 0)) t1 = imm >u rsl
+	 * else                      t1 = rsl <u imm
+	 */
+	emit_mov_i(ctx, rd, (s32)imm);
+	emit(ctx, sltu, t1, lo(rs), rd);               /* t1 = rsl <u imm   */
+	emit(ctx, sltu, t2, rd, lo(rs));               /* t2 = imm <u rsl   */
+	emit(ctx, srl, rd, hi(rs), 31);                /* rd = rsh >> 31    */
+	if (imm < 0)
+		emit_movz_r(ctx, t1, t2, rd);          /* t1 = rd ? t1 : t2 */
+	else
+		emit_movn_r(ctx, t1, t2, rd);          /* t1 = rd ? t2 : t1 */
+	/*
+	 * if ((imm < 0 && rsh != 0xffffffff) ||
+	 *     (imm >= 0 && rsh != 0))
+	 *      t1 = 0
+	 */
+	if (imm < 0) {
+		emit(ctx, addiu, rd, hi(rs), 1);       /* rd = rsh + 1 */
+		cmp = rd;
+	} else { /* imm >= 0 */
+		cmp = hi(rs);
+	}
+	emit_movn_r(ctx, t1, MIPS_R_ZERO, cmp);        /* t1 = 0 if cmp != 0 */
+
+	/*
+	 * if (imm < 0) rd = rsh < -1
+	 * else         rd = rsh != 0
+	 * rd = rd | t1
+	 */
+	emit(ctx, slti, rd, hi(rs), imm < 0 ? -1 : 0); /* rd = rsh < hi(imm) */
+	emit(ctx, or, rd, rd, t1);                     /* rd = rd | t1       */
+}
+
+/* Emulation of 64-bit(slt rd, rs, rt) */
+static void emit_slt_r64(struct jit_context *ctx, u8 rd,
+			 const u8 rs[], const u8 rt[])
+{
+	u8 t1 = MIPS_R_T7;
+	u8 t2 = MIPS_R_T8;
+	u8 t3 = MIPS_R_T9;
+
+	/*
+	 * if ((rs < 0) ^ (rt < 0)) t1 = rtl <u rsl
+	 * else                     t1 = rsl <u rtl
+	 * if (rsh == rth)          t1 = 0
+	 */
+	emit(ctx, sltu, t1, lo(rs), lo(rt));           /* t1 = rsl <u rtl   */
+	emit(ctx, sltu, t2, lo(rt), lo(rs));           /* t2 = rtl <u rsl   */
+	emit(ctx, xor, t3, hi(rs), hi(rt));            /* t3 = rlh ^ rth    */
+	emit(ctx, srl, rd, t3, 31);                    /* rd = t3 >> 31     */
+	emit_movn_r(ctx, t1, t2, rd);                  /* t1 = rd ? t2 : t1 */
+	emit_movn_r(ctx, t1, MIPS_R_ZERO, t3);         /* t1 = 0 if t3 != 0 */
+
+	/* rd = (rsh < rth) | t1 */
+	emit(ctx, slt, rd, hi(rs), hi(rt));            /* rd = rsh <s rth   */
+	emit(ctx, or, rd, rd, t1);                     /* rd = rd | t1      */
+}
+
+/* Jump immediate (64-bit) */
+static void emit_jmp_i64(struct jit_context *ctx,
+			 const u8 dst[], s32 imm, s32 off, u8 op)
+{
+	u8 tmp = MIPS_R_T6;
+
+	switch (op) {
+	/* No-op, used internally for branch optimization */
+	case JIT_JNOP:
+		break;
+	/* PC += off if dst == imm */
+	/* PC += off if dst != imm */
+	case BPF_JEQ:
+	case BPF_JNE:
+		if (imm >= -0x7fff && imm <= 0x8000) {
+			emit(ctx, addiu, tmp, lo(dst), -imm);
+		} else if ((u32)imm <= 0xffff) {
+			emit(ctx, xori, tmp, lo(dst), imm);
+		} else {       /* Register fallback */
+			emit_mov_i(ctx, tmp, imm);
+			emit(ctx, xor, tmp, lo(dst), tmp);
+		}
+		if (imm < 0) { /* Compare sign extension */
+			emit(ctx, addu, MIPS_R_T9, hi(dst), 1);
+			emit(ctx, or, tmp, tmp, MIPS_R_T9);
+		} else {       /* Compare zero extension */
+			emit(ctx, or, tmp, tmp, hi(dst));
+		}
+		if (op == BPF_JEQ)
+			emit(ctx, beqz, tmp, off);
+		else   /* BPF_JNE */
+			emit(ctx, bnez, tmp, off);
+		break;
+	/* PC += off if dst & imm */
+	/* PC += off if (dst & imm) == 0 (not in BPF, used for long jumps) */
+	case BPF_JSET:
+	case JIT_JNSET:
+		if ((u32)imm <= 0xffff) {
+			emit(ctx, andi, tmp, lo(dst), imm);
+		} else {     /* Register fallback */
+			emit_mov_i(ctx, tmp, imm);
+			emit(ctx, and, tmp, lo(dst), tmp);
+		}
+		if (imm < 0) /* Sign-extension pulls in high word */
+			emit(ctx, or, tmp, tmp, hi(dst));
+		if (op == BPF_JSET)
+			emit(ctx, bnez, tmp, off);
+		else   /* JIT_JNSET */
+			emit(ctx, beqz, tmp, off);
+		break;
+	/* PC += off if dst > imm */
+	case BPF_JGT:
+		emit_sltiu_r64(ctx, tmp, dst, (s64)imm + 1);
+		emit(ctx, beqz, tmp, off);
+		break;
+	/* PC += off if dst >= imm */
+	case BPF_JGE:
+		emit_sltiu_r64(ctx, tmp, dst, imm);
+		emit(ctx, beqz, tmp, off);
+		break;
+	/* PC += off if dst < imm */
+	case BPF_JLT:
+		emit_sltiu_r64(ctx, tmp, dst, imm);
+		emit(ctx, bnez, tmp, off);
+		break;
+	/* PC += off if dst <= imm */
+	case BPF_JLE:
+		emit_sltiu_r64(ctx, tmp, dst, (s64)imm + 1);
+		emit(ctx, bnez, tmp, off);
+		break;
+	/* PC += off if dst > imm (signed) */
+	case BPF_JSGT:
+		emit_slti_r64(ctx, tmp, dst, (s64)imm + 1);
+		emit(ctx, beqz, tmp, off);
+		break;
+	/* PC += off if dst >= imm (signed) */
+	case BPF_JSGE:
+		emit_slti_r64(ctx, tmp, dst, imm);
+		emit(ctx, beqz, tmp, off);
+		break;
+	/* PC += off if dst < imm (signed) */
+	case BPF_JSLT:
+		emit_slti_r64(ctx, tmp, dst, imm);
+		emit(ctx, bnez, tmp, off);
+		break;
+	/* PC += off if dst <= imm (signed) */
+	case BPF_JSLE:
+		emit_slti_r64(ctx, tmp, dst, (s64)imm + 1);
+		emit(ctx, bnez, tmp, off);
+		break;
+	}
+}
+
+/* Jump register (64-bit) */
+static void emit_jmp_r64(struct jit_context *ctx,
+			 const u8 dst[], const u8 src[], s32 off, u8 op)
+{
+	u8 t1 = MIPS_R_T6;
+	u8 t2 = MIPS_R_T7;
+
+	switch (op) {
+	/* No-op, used internally for branch optimization */
+	case JIT_JNOP:
+		break;
+	/* PC += off if dst == src */
+	/* PC += off if dst != src */
+	case BPF_JEQ:
+	case BPF_JNE:
+		emit(ctx, subu, t1, lo(dst), lo(src));
+		emit(ctx, subu, t2, hi(dst), hi(src));
+		emit(ctx, or, t1, t1, t2);
+		if (op == BPF_JEQ)
+			emit(ctx, beqz, t1, off);
+		else   /* BPF_JNE */
+			emit(ctx, bnez, t1, off);
+		break;
+	/* PC += off if dst & src */
+	/* PC += off if (dst & imm) == 0 (not in BPF, used for long jumps) */
+	case BPF_JSET:
+	case JIT_JNSET:
+		emit(ctx, and, t1, lo(dst), lo(src));
+		emit(ctx, and, t2, hi(dst), hi(src));
+		emit(ctx, or, t1, t1, t2);
+		if (op == BPF_JSET)
+			emit(ctx, bnez, t1, off);
+		else   /* JIT_JNSET */
+			emit(ctx, beqz, t1, off);
+		break;
+	/* PC += off if dst > src */
+	case BPF_JGT:
+		emit_sltu_r64(ctx, t1, src, dst);
+		emit(ctx, bnez, t1, off);
+		break;
+	/* PC += off if dst >= src */
+	case BPF_JGE:
+		emit_sltu_r64(ctx, t1, dst, src);
+		emit(ctx, beqz, t1, off);
+		break;
+	/* PC += off if dst < src */
+	case BPF_JLT:
+		emit_sltu_r64(ctx, t1, dst, src);
+		emit(ctx, bnez, t1, off);
+		break;
+	/* PC += off if dst <= src */
+	case BPF_JLE:
+		emit_sltu_r64(ctx, t1, src, dst);
+		emit(ctx, beqz, t1, off);
+		break;
+	/* PC += off if dst > src (signed) */
+	case BPF_JSGT:
+		emit_slt_r64(ctx, t1, src, dst);
+		emit(ctx, bnez, t1, off);
+		break;
+	/* PC += off if dst >= src (signed) */
+	case BPF_JSGE:
+		emit_slt_r64(ctx, t1, dst, src);
+		emit(ctx, beqz, t1, off);
+		break;
+	/* PC += off if dst < src (signed) */
+	case BPF_JSLT:
+		emit_slt_r64(ctx, t1, dst, src);
+		emit(ctx, bnez, t1, off);
+		break;
+	/* PC += off if dst <= src (signed) */
+	case BPF_JSLE:
+		emit_slt_r64(ctx, t1, src, dst);
+		emit(ctx, beqz, t1, off);
+		break;
+	}
+}
+
+/* Function call */
+static int emit_call(struct jit_context *ctx, const struct bpf_insn *insn)
+{
+	bool fixed;
+	u64 addr;
+
+	/* Decode the call address */
+	if (bpf_jit_get_func_addr(ctx->program, insn, false,
+				  &addr, &fixed) < 0)
+		return -1;
+	if (!fixed)
+		return -1;
+
+	/* Push stack arguments */
+	push_regs(ctx, JIT_STACK_REGS, 0, JIT_RESERVED_STACK);
+
+	/* Emit function call */
+	emit_mov_i(ctx, MIPS_R_T9, addr);
+	emit(ctx, jalr, MIPS_R_RA, MIPS_R_T9);
+	emit(ctx, nop); /* Delay slot */
+
+	clobber_reg(ctx, MIPS_R_RA);
+	clobber_reg(ctx, MIPS_R_V0);
+	clobber_reg(ctx, MIPS_R_V1);
+	return 0;
+}
+
+/* Function tail call */
+static int emit_tail_call(struct jit_context *ctx)
+{
+	u8 ary = lo(bpf2mips32[BPF_REG_2]);
+	u8 ind = lo(bpf2mips32[BPF_REG_3]);
+	u8 t1 = MIPS_R_T8;
+	u8 t2 = MIPS_R_T9;
+	int off;
+
+	/*
+	 * Tail call:
+	 * eBPF R1   - function argument (context ptr), passed in a0-a1
+	 * eBPF R2   - ptr to object with array of function entry points
+	 * eBPF R3   - array index of function to be called
+	 * stack[sz] - remaining tail call count, initialized in prologue
+	 */
+
+	/* if (ind >= ary->map.max_entries) goto out */
+	off = offsetof(struct bpf_array, map.max_entries);
+	if (off > 0x7fff)
+		return -1;
+	emit(ctx, lw, t1, off, ary);             /* t1 = ary->map.max_entries*/
+	emit_load_delay(ctx);                    /* Load delay slot          */
+	emit(ctx, sltu, t1, ind, t1);            /* t1 = ind < t1            */
+	emit(ctx, beqz, t1, get_offset(ctx, 1)); /* PC += off(1) if t1 == 0  */
+						 /* (next insn delay slot)   */
+	/* if (TCC-- <= 0) goto out */
+	emit(ctx, lw, t2, ctx->stack_size, MIPS_R_SP);  /* t2 = *(SP + size) */
+	emit_load_delay(ctx);                     /* Load delay slot         */
+	emit(ctx, blez, t2, get_offset(ctx, 1));  /* PC += off(1) if t2 <= 0 */
+	emit(ctx, addiu, t2, t2, -1);             /* t2-- (delay slot)       */
+	emit(ctx, sw, t2, ctx->stack_size, MIPS_R_SP);  /* *(SP + size) = t2 */
+
+	/* prog = ary->ptrs[ind] */
+	off = offsetof(struct bpf_array, ptrs);
+	if (off > 0x7fff)
+		return -1;
+	emit(ctx, sll, t1, ind, 2);               /* t1 = ind << 2           */
+	emit(ctx, addu, t1, t1, ary);             /* t1 += ary               */
+	emit(ctx, lw, t2, off, t1);               /* t2 = *(t1 + off)        */
+	emit_load_delay(ctx);                     /* Load delay slot         */
+
+	/* if (prog == 0) goto out */
+	emit(ctx, beqz, t2, get_offset(ctx, 1));  /* PC += off(1) if t2 == 0 */
+	emit(ctx, nop);                           /* Delay slot              */
+
+	/* func = prog->bpf_func + 8 (prologue skip offset) */
+	off = offsetof(struct bpf_prog, bpf_func);
+	if (off > 0x7fff)
+		return -1;
+	emit(ctx, lw, t1, off, t2);                /* t1 = *(t2 + off)       */
+	emit_load_delay(ctx);                      /* Load delay slot        */
+	emit(ctx, addiu, t1, t1, JIT_TCALL_SKIP);  /* t1 += skip (8 or 12)   */
+
+	/* goto func */
+	build_epilogue(ctx, t1);
+	return 0;
+}
+
+/*
+ * Stack frame layout for a JITed program (stack grows down).
+ *
+ * Higher address  : Caller's stack frame       :
+ *                 :----------------------------:
+ *                 : 64-bit eBPF args r3-r5     :
+ *                 :----------------------------:
+ *                 : Reserved / tail call count :
+ *                 +============================+  <--- MIPS sp before call
+ *                 | Callee-saved registers,    |
+ *                 | including RA and FP        |
+ *                 +----------------------------+  <--- eBPF FP (MIPS zero,fp)
+ *                 | Local eBPF variables       |
+ *                 | allocated by program       |
+ *                 +----------------------------+
+ *                 | Reserved for caller-saved  |
+ *                 | registers                  |
+ *                 +----------------------------+
+ *                 | Reserved for 64-bit eBPF   |
+ *                 | args r3-r5 & args passed   |
+ *                 | on stack in kernel calls   |
+ * Lower address   +============================+  <--- MIPS sp
+ */
+
+/* Build program prologue to set up the stack and registers */
+void build_prologue(struct jit_context *ctx)
+{
+	const u8 *r1 = bpf2mips32[BPF_REG_1];
+	const u8 *fp = bpf2mips32[BPF_REG_FP];
+	int stack, saved, locals, reserved;
+
+	/*
+	 * In the unlikely event that the TCC limit is raised to more
+	 * than 16 bits, it is clamped to the maximum value allowed for
+	 * the generated code (0xffff). It is better fail to compile
+	 * instead of degrading gracefully.
+	 */
+	BUILD_BUG_ON(MAX_TAIL_CALL_CNT > 0xffff);
+
+	/*
+	 * The first two instructions initialize TCC in the reserved (for us)
+	 * 16-byte area in the parent's stack frame. On a tail call, the
+	 * calling function jumps into the prologue after these instructions.
+	 */
+	emit(ctx, ori, MIPS_R_T9, MIPS_R_ZERO, MAX_TAIL_CALL_CNT);
+	emit(ctx, sw, MIPS_R_T9, 0, MIPS_R_SP);
+
+	/*
+	 * Register eBPF R1 contains the 32-bit context pointer argument.
+	 * A 32-bit argument is always passed in MIPS register a0, regardless
+	 * of CPU endianness. Initialize R1 accordingly and zero-extend.
+	 */
+#ifdef __BIG_ENDIAN
+	emit(ctx, move, lo(r1), MIPS_R_A0);
+#endif
+
+	/* === Entry-point for tail calls === */
+
+	/* Zero-extend the 32-bit argument */
+	emit(ctx, move, hi(r1), MIPS_R_ZERO);
+
+	/* If the eBPF frame pointer was accessed it must be saved */
+	if (ctx->accessed & BIT(BPF_REG_FP))
+		clobber_reg64(ctx, fp);
+
+	/* Compute the stack space needed for callee-saved registers */
+	saved = hweight32(ctx->clobbered & JIT_CALLEE_REGS) * sizeof(u32);
+	saved = ALIGN(saved, MIPS_STACK_ALIGNMENT);
+
+	/* Stack space used by eBPF program local data */
+	locals = ALIGN(ctx->program->aux->stack_depth, MIPS_STACK_ALIGNMENT);
+
+	/*
+	 * If we are emitting function calls, reserve extra stack space for
+	 * caller-saved registers and function arguments passed on the stack.
+	 * The required space is computed automatically during resource
+	 * usage discovery (pass 1).
+	 */
+	reserved = ctx->stack_used;
+
+	/* Allocate the stack frame */
+	stack = ALIGN(saved + locals + reserved, MIPS_STACK_ALIGNMENT);
+	emit(ctx, addiu, MIPS_R_SP, MIPS_R_SP, -stack);
+
+	/* Store callee-saved registers on stack */
+	push_regs(ctx, ctx->clobbered & JIT_CALLEE_REGS, 0, stack - saved);
+
+	/* Initialize the eBPF frame pointer if accessed */
+	if (ctx->accessed & BIT(BPF_REG_FP))
+		emit(ctx, addiu, lo(fp), MIPS_R_SP, stack - saved);
+
+	ctx->saved_size = saved;
+	ctx->stack_size = stack;
+}
+
+/* Build the program epilogue to restore the stack and registers */
+void build_epilogue(struct jit_context *ctx, int dest_reg)
+{
+	/* Restore callee-saved registers from stack */
+	pop_regs(ctx, ctx->clobbered & JIT_CALLEE_REGS, 0,
+		 ctx->stack_size - ctx->saved_size);
+	/*
+	 * A 32-bit return value is always passed in MIPS register v0,
+	 * but on big-endian targets the low part of R0 is mapped to v1.
+	 */
+#ifdef __BIG_ENDIAN
+	emit(ctx, move, MIPS_R_V0, MIPS_R_V1);
+#endif
+
+	/* Jump to the return address and adjust the stack pointer */
+	emit(ctx, jr, dest_reg);
+	emit(ctx, addiu, MIPS_R_SP, MIPS_R_SP, ctx->stack_size);
+}
+
+/* Build one eBPF instruction */
+int build_insn(const struct bpf_insn *insn, struct jit_context *ctx)
+{
+	const u8 *dst = bpf2mips32[insn->dst_reg];
+	const u8 *src = bpf2mips32[insn->src_reg];
+	const u8 *res = bpf2mips32[BPF_REG_0];
+	const u8 *tmp = bpf2mips32[JIT_REG_TMP];
+	u8 code = insn->code;
+	s16 off = insn->off;
+	s32 imm = insn->imm;
+	s32 val, rel;
+	u8 alu, jmp;
+
+	switch (code) {
+	/* ALU operations */
+	/* dst = imm */
+	case BPF_ALU | BPF_MOV | BPF_K:
+		emit_mov_i(ctx, lo(dst), imm);
+		emit_zext_ver(ctx, dst);
+		break;
+	/* dst = src */
+	case BPF_ALU | BPF_MOV | BPF_X:
+		if (imm == 1) {
+			/* Special mov32 for zext */
+			emit_mov_i(ctx, hi(dst), 0);
+		} else {
+			emit_mov_r(ctx, lo(dst), lo(src));
+			emit_zext_ver(ctx, dst);
+		}
+		break;
+	/* dst = -dst */
+	case BPF_ALU | BPF_NEG:
+		emit_alu_i(ctx, lo(dst), 0, BPF_NEG);
+		emit_zext_ver(ctx, dst);
+		break;
+	/* dst = dst & imm */
+	/* dst = dst | imm */
+	/* dst = dst ^ imm */
+	/* dst = dst << imm */
+	/* dst = dst >> imm */
+	/* dst = dst >> imm (arithmetic) */
+	/* dst = dst + imm */
+	/* dst = dst - imm */
+	/* dst = dst * imm */
+	/* dst = dst / imm */
+	/* dst = dst % imm */
+	case BPF_ALU | BPF_OR | BPF_K:
+	case BPF_ALU | BPF_AND | BPF_K:
+	case BPF_ALU | BPF_XOR | BPF_K:
+	case BPF_ALU | BPF_LSH | BPF_K:
+	case BPF_ALU | BPF_RSH | BPF_K:
+	case BPF_ALU | BPF_ARSH | BPF_K:
+	case BPF_ALU | BPF_ADD | BPF_K:
+	case BPF_ALU | BPF_SUB | BPF_K:
+	case BPF_ALU | BPF_MUL | BPF_K:
+	case BPF_ALU | BPF_DIV | BPF_K:
+	case BPF_ALU | BPF_MOD | BPF_K:
+		if (!valid_alu_i(BPF_OP(code), imm)) {
+			emit_mov_i(ctx, MIPS_R_T6, imm);
+			emit_alu_r(ctx, lo(dst), MIPS_R_T6, BPF_OP(code));
+		} else if (rewrite_alu_i(BPF_OP(code), imm, &alu, &val)) {
+			emit_alu_i(ctx, lo(dst), val, alu);
+		}
+		emit_zext_ver(ctx, dst);
+		break;
+	/* dst = dst & src */
+	/* dst = dst | src */
+	/* dst = dst ^ src */
+	/* dst = dst << src */
+	/* dst = dst >> src */
+	/* dst = dst >> src (arithmetic) */
+	/* dst = dst + src */
+	/* dst = dst - src */
+	/* dst = dst * src */
+	/* dst = dst / src */
+	/* dst = dst % src */
+	case BPF_ALU | BPF_AND | BPF_X:
+	case BPF_ALU | BPF_OR | BPF_X:
+	case BPF_ALU | BPF_XOR | BPF_X:
+	case BPF_ALU | BPF_LSH | BPF_X:
+	case BPF_ALU | BPF_RSH | BPF_X:
+	case BPF_ALU | BPF_ARSH | BPF_X:
+	case BPF_ALU | BPF_ADD | BPF_X:
+	case BPF_ALU | BPF_SUB | BPF_X:
+	case BPF_ALU | BPF_MUL | BPF_X:
+	case BPF_ALU | BPF_DIV | BPF_X:
+	case BPF_ALU | BPF_MOD | BPF_X:
+		emit_alu_r(ctx, lo(dst), lo(src), BPF_OP(code));
+		emit_zext_ver(ctx, dst);
+		break;
+	/* dst = imm (64-bit) */
+	case BPF_ALU64 | BPF_MOV | BPF_K:
+		emit_mov_se_i64(ctx, dst, imm);
+		break;
+	/* dst = src (64-bit) */
+	case BPF_ALU64 | BPF_MOV | BPF_X:
+		emit_mov_r(ctx, lo(dst), lo(src));
+		emit_mov_r(ctx, hi(dst), hi(src));
+		break;
+	/* dst = -dst (64-bit) */
+	case BPF_ALU64 | BPF_NEG:
+		emit_neg_i64(ctx, dst);
+		break;
+	/* dst = dst & imm (64-bit) */
+	case BPF_ALU64 | BPF_AND | BPF_K:
+		emit_alu_i64(ctx, dst, imm, BPF_OP(code));
+		break;
+	/* dst = dst | imm (64-bit) */
+	/* dst = dst ^ imm (64-bit) */
+	/* dst = dst + imm (64-bit) */
+	/* dst = dst - imm (64-bit) */
+	case BPF_ALU64 | BPF_OR | BPF_K:
+	case BPF_ALU64 | BPF_XOR | BPF_K:
+	case BPF_ALU64 | BPF_ADD | BPF_K:
+	case BPF_ALU64 | BPF_SUB | BPF_K:
+		if (imm)
+			emit_alu_i64(ctx, dst, imm, BPF_OP(code));
+		break;
+	/* dst = dst << imm (64-bit) */
+	/* dst = dst >> imm (64-bit) */
+	/* dst = dst >> imm (64-bit, arithmetic) */
+	case BPF_ALU64 | BPF_LSH | BPF_K:
+	case BPF_ALU64 | BPF_RSH | BPF_K:
+	case BPF_ALU64 | BPF_ARSH | BPF_K:
+		if (imm)
+			emit_shift_i64(ctx, dst, imm, BPF_OP(code));
+		break;
+	/* dst = dst * imm (64-bit) */
+	case BPF_ALU64 | BPF_MUL | BPF_K:
+		emit_mul_i64(ctx, dst, imm);
+		break;
+	/* dst = dst / imm (64-bit) */
+	/* dst = dst % imm (64-bit) */
+	case BPF_ALU64 | BPF_DIV | BPF_K:
+	case BPF_ALU64 | BPF_MOD | BPF_K:
+		/*
+		 * Sign-extend the immediate value into a temporary register,
+		 * and then do the operation on this register.
+		 */
+		emit_mov_se_i64(ctx, tmp, imm);
+		emit_divmod_r64(ctx, dst, tmp, BPF_OP(code));
+		break;
+	/* dst = dst & src (64-bit) */
+	/* dst = dst | src (64-bit) */
+	/* dst = dst ^ src (64-bit) */
+	/* dst = dst + src (64-bit) */
+	/* dst = dst - src (64-bit) */
+	case BPF_ALU64 | BPF_AND | BPF_X:
+	case BPF_ALU64 | BPF_OR | BPF_X:
+	case BPF_ALU64 | BPF_XOR | BPF_X:
+	case BPF_ALU64 | BPF_ADD | BPF_X:
+	case BPF_ALU64 | BPF_SUB | BPF_X:
+		emit_alu_r64(ctx, dst, src, BPF_OP(code));
+		break;
+	/* dst = dst << src (64-bit) */
+	/* dst = dst >> src (64-bit) */
+	/* dst = dst >> src (64-bit, arithmetic) */
+	case BPF_ALU64 | BPF_LSH | BPF_X:
+	case BPF_ALU64 | BPF_RSH | BPF_X:
+	case BPF_ALU64 | BPF_ARSH | BPF_X:
+		emit_shift_r64(ctx, dst, lo(src), BPF_OP(code));
+		break;
+	/* dst = dst * src (64-bit) */
+	case BPF_ALU64 | BPF_MUL | BPF_X:
+		emit_mul_r64(ctx, dst, src);
+		break;
+	/* dst = dst / src (64-bit) */
+	/* dst = dst % src (64-bit) */
+	case BPF_ALU64 | BPF_DIV | BPF_X:
+	case BPF_ALU64 | BPF_MOD | BPF_X:
+		emit_divmod_r64(ctx, dst, src, BPF_OP(code));
+		break;
+	/* dst = htole(dst) */
+	/* dst = htobe(dst) */
+	case BPF_ALU | BPF_END | BPF_FROM_LE:
+	case BPF_ALU | BPF_END | BPF_FROM_BE:
+		if (BPF_SRC(code) ==
+#ifdef __BIG_ENDIAN
+		    BPF_FROM_LE
+#else
+		    BPF_FROM_BE
+#endif
+		    )
+			emit_bswap_r64(ctx, dst, imm);
+		else
+			emit_trunc_r64(ctx, dst, imm);
+		break;
+	/* dst = imm64 */
+	case BPF_LD | BPF_IMM | BPF_DW:
+		emit_mov_i(ctx, lo(dst), imm);
+		emit_mov_i(ctx, hi(dst), insn[1].imm);
+		return 1;
+	/* LDX: dst = *(size *)(src + off) */
+	case BPF_LDX | BPF_MEM | BPF_W:
+	case BPF_LDX | BPF_MEM | BPF_H:
+	case BPF_LDX | BPF_MEM | BPF_B:
+	case BPF_LDX | BPF_MEM | BPF_DW:
+		emit_ldx(ctx, dst, lo(src), off, BPF_SIZE(code));
+		break;
+	/* ST: *(size *)(dst + off) = imm */
+	case BPF_ST | BPF_MEM | BPF_W:
+	case BPF_ST | BPF_MEM | BPF_H:
+	case BPF_ST | BPF_MEM | BPF_B:
+	case BPF_ST | BPF_MEM | BPF_DW:
+		switch (BPF_SIZE(code)) {
+		case BPF_DW:
+			/* Sign-extend immediate value into temporary reg */
+			emit_mov_se_i64(ctx, tmp, imm);
+			break;
+		case BPF_W:
+		case BPF_H:
+		case BPF_B:
+			emit_mov_i(ctx, lo(tmp), imm);
+			break;
+		}
+		emit_stx(ctx, lo(dst), tmp, off, BPF_SIZE(code));
+		break;
+	/* STX: *(size *)(dst + off) = src */
+	case BPF_STX | BPF_MEM | BPF_W:
+	case BPF_STX | BPF_MEM | BPF_H:
+	case BPF_STX | BPF_MEM | BPF_B:
+	case BPF_STX | BPF_MEM | BPF_DW:
+		emit_stx(ctx, lo(dst), src, off, BPF_SIZE(code));
+		break;
+	/* Speculation barrier */
+	case BPF_ST | BPF_NOSPEC:
+		break;
+	/* Atomics */
+	case BPF_STX | BPF_ATOMIC | BPF_W:
+		switch (imm) {
+		case BPF_ADD:
+		case BPF_ADD | BPF_FETCH:
+		case BPF_AND:
+		case BPF_AND | BPF_FETCH:
+		case BPF_OR:
+		case BPF_OR | BPF_FETCH:
+		case BPF_XOR:
+		case BPF_XOR | BPF_FETCH:
+		case BPF_XCHG:
+			if (cpu_has_llsc)
+				emit_atomic_r(ctx, lo(dst), lo(src), off, imm);
+			else /* Non-ll/sc fallback */
+				emit_atomic_r32(ctx, lo(dst), lo(src),
+						off, imm);
+			if (imm & BPF_FETCH)
+				emit_zext_ver(ctx, src);
+			break;
+		case BPF_CMPXCHG:
+			if (cpu_has_llsc)
+				emit_cmpxchg_r(ctx, lo(dst), lo(src),
+					       lo(res), off);
+			else /* Non-ll/sc fallback */
+				emit_cmpxchg_r32(ctx, lo(dst), lo(src), off);
+			/* Result zero-extension inserted by verifier */
+			break;
+		default:
+			goto notyet;
+		}
+		break;
+	/* Atomics (64-bit) */
+	case BPF_STX | BPF_ATOMIC | BPF_DW:
+		switch (imm) {
+		case BPF_ADD:
+		case BPF_ADD | BPF_FETCH:
+		case BPF_AND:
+		case BPF_AND | BPF_FETCH:
+		case BPF_OR:
+		case BPF_OR | BPF_FETCH:
+		case BPF_XOR:
+		case BPF_XOR | BPF_FETCH:
+		case BPF_XCHG:
+			emit_atomic_r64(ctx, lo(dst), src, off, imm);
+			break;
+		case BPF_CMPXCHG:
+			emit_cmpxchg_r64(ctx, lo(dst), src, off);
+			break;
+		default:
+			goto notyet;
+		}
+		break;
+	/* PC += off if dst == src */
+	/* PC += off if dst != src */
+	/* PC += off if dst & src */
+	/* PC += off if dst > src */
+	/* PC += off if dst >= src */
+	/* PC += off if dst < src */
+	/* PC += off if dst <= src */
+	/* PC += off if dst > src (signed) */
+	/* PC += off if dst >= src (signed) */
+	/* PC += off if dst < src (signed) */
+	/* PC += off if dst <= src (signed) */
+	case BPF_JMP32 | BPF_JEQ | BPF_X:
+	case BPF_JMP32 | BPF_JNE | BPF_X:
+	case BPF_JMP32 | BPF_JSET | BPF_X:
+	case BPF_JMP32 | BPF_JGT | BPF_X:
+	case BPF_JMP32 | BPF_JGE | BPF_X:
+	case BPF_JMP32 | BPF_JLT | BPF_X:
+	case BPF_JMP32 | BPF_JLE | BPF_X:
+	case BPF_JMP32 | BPF_JSGT | BPF_X:
+	case BPF_JMP32 | BPF_JSGE | BPF_X:
+	case BPF_JMP32 | BPF_JSLT | BPF_X:
+	case BPF_JMP32 | BPF_JSLE | BPF_X:
+		if (off == 0)
+			break;
+		setup_jmp_r(ctx, dst == src, BPF_OP(code), off, &jmp, &rel);
+		emit_jmp_r(ctx, lo(dst), lo(src), rel, jmp);
+		if (finish_jmp(ctx, jmp, off) < 0)
+			goto toofar;
+		break;
+	/* PC += off if dst == imm */
+	/* PC += off if dst != imm */
+	/* PC += off if dst & imm */
+	/* PC += off if dst > imm */
+	/* PC += off if dst >= imm */
+	/* PC += off if dst < imm */
+	/* PC += off if dst <= imm */
+	/* PC += off if dst > imm (signed) */
+	/* PC += off if dst >= imm (signed) */
+	/* PC += off if dst < imm (signed) */
+	/* PC += off if dst <= imm (signed) */
+	case BPF_JMP32 | BPF_JEQ | BPF_K:
+	case BPF_JMP32 | BPF_JNE | BPF_K:
+	case BPF_JMP32 | BPF_JSET | BPF_K:
+	case BPF_JMP32 | BPF_JGT | BPF_K:
+	case BPF_JMP32 | BPF_JGE | BPF_K:
+	case BPF_JMP32 | BPF_JLT | BPF_K:
+	case BPF_JMP32 | BPF_JLE | BPF_K:
+	case BPF_JMP32 | BPF_JSGT | BPF_K:
+	case BPF_JMP32 | BPF_JSGE | BPF_K:
+	case BPF_JMP32 | BPF_JSLT | BPF_K:
+	case BPF_JMP32 | BPF_JSLE | BPF_K:
+		if (off == 0)
+			break;
+		setup_jmp_i(ctx, imm, 32, BPF_OP(code), off, &jmp, &rel);
+		if (valid_jmp_i(jmp, imm)) {
+			emit_jmp_i(ctx, lo(dst), imm, rel, jmp);
+		} else {
+			/* Move large immediate to register */
+			emit_mov_i(ctx, MIPS_R_T6, imm);
+			emit_jmp_r(ctx, lo(dst), MIPS_R_T6, rel, jmp);
+		}
+		if (finish_jmp(ctx, jmp, off) < 0)
+			goto toofar;
+		break;
+	/* PC += off if dst == src */
+	/* PC += off if dst != src */
+	/* PC += off if dst & src */
+	/* PC += off if dst > src */
+	/* PC += off if dst >= src */
+	/* PC += off if dst < src */
+	/* PC += off if dst <= src */
+	/* PC += off if dst > src (signed) */
+	/* PC += off if dst >= src (signed) */
+	/* PC += off if dst < src (signed) */
+	/* PC += off if dst <= src (signed) */
+	case BPF_JMP | BPF_JEQ | BPF_X:
+	case BPF_JMP | BPF_JNE | BPF_X:
+	case BPF_JMP | BPF_JSET | BPF_X:
+	case BPF_JMP | BPF_JGT | BPF_X:
+	case BPF_JMP | BPF_JGE | BPF_X:
+	case BPF_JMP | BPF_JLT | BPF_X:
+	case BPF_JMP | BPF_JLE | BPF_X:
+	case BPF_JMP | BPF_JSGT | BPF_X:
+	case BPF_JMP | BPF_JSGE | BPF_X:
+	case BPF_JMP | BPF_JSLT | BPF_X:
+	case BPF_JMP | BPF_JSLE | BPF_X:
+		if (off == 0)
+			break;
+		setup_jmp_r(ctx, dst == src, BPF_OP(code), off, &jmp, &rel);
+		emit_jmp_r64(ctx, dst, src, rel, jmp);
+		if (finish_jmp(ctx, jmp, off) < 0)
+			goto toofar;
+		break;
+	/* PC += off if dst == imm */
+	/* PC += off if dst != imm */
+	/* PC += off if dst & imm */
+	/* PC += off if dst > imm */
+	/* PC += off if dst >= imm */
+	/* PC += off if dst < imm */
+	/* PC += off if dst <= imm */
+	/* PC += off if dst > imm (signed) */
+	/* PC += off if dst >= imm (signed) */
+	/* PC += off if dst < imm (signed) */
+	/* PC += off if dst <= imm (signed) */
+	case BPF_JMP | BPF_JEQ | BPF_K:
+	case BPF_JMP | BPF_JNE | BPF_K:
+	case BPF_JMP | BPF_JSET | BPF_K:
+	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:
+	case BPF_JMP | BPF_JSGT | BPF_K:
+	case BPF_JMP | BPF_JSGE | BPF_K:
+	case BPF_JMP | BPF_JSLT | BPF_K:
+	case BPF_JMP | BPF_JSLE | BPF_K:
+		if (off == 0)
+			break;
+		setup_jmp_i(ctx, imm, 64, BPF_OP(code), off, &jmp, &rel);
+		emit_jmp_i64(ctx, dst, imm, rel, jmp);
+		if (finish_jmp(ctx, jmp, off) < 0)
+			goto toofar;
+		break;
+	/* PC += off */
+	case BPF_JMP | BPF_JA:
+		if (off == 0)
+			break;
+		if (emit_ja(ctx, off) < 0)
+			goto toofar;
+		break;
+	/* Tail call */
+	case BPF_JMP | BPF_TAIL_CALL:
+		if (emit_tail_call(ctx) < 0)
+			goto invalid;
+		break;
+	/* Function call */
+	case BPF_JMP | BPF_CALL:
+		if (emit_call(ctx, insn) < 0)
+			goto invalid;
+		break;
+	/* Function return */
+	case BPF_JMP | BPF_EXIT:
+		/*
+		 * Optimization: when last instruction is EXIT
+		 * simply continue to epilogue.
+		 */
+		if (ctx->bpf_index == ctx->program->len - 1)
+			break;
+		if (emit_exit(ctx) < 0)
+			goto toofar;
+		break;
+
+	default:
+invalid:
+		pr_err_once("unknown opcode %02x\n", code);
+		return -EINVAL;
+notyet:
+		pr_info_once("*** NOT YET: opcode %02x ***\n", code);
+		return -EFAULT;
+toofar:
+		pr_info_once("*** TOO FAR: jump at %u opcode %02x ***\n",
+			     ctx->bpf_index, code);
+		return -E2BIG;
+	}
+	return 0;
+}
diff --git a/arch/mips/net/bpf_jit_comp64.c b/arch/mips/net/bpf_jit_comp64.c
new file mode 100644
index 000000000..0e7c1bdcf
--- /dev/null
+++ b/arch/mips/net/bpf_jit_comp64.c
@@ -0,0 +1,1068 @@
+// SPDX-License-Identifier: GPL-2.0-only
+/*
+ * Just-In-Time compiler for eBPF bytecode on MIPS.
+ * Implementation of JIT functions for 64-bit CPUs.
+ *
+ * Copyright (c) 2021 Anyfi Networks AB.
+ * Author: Johan Almbladh <johan.almbladh@gmail.com>
+ *
+ * Based on code and ideas from
+ * Copyright (c) 2017 Cavium, Inc.
+ * Copyright (c) 2017 Shubham Bansal <illusionist.neo@gmail.com>
+ * Copyright (c) 2011 Mircea Gherzan <mgherzan@gmail.com>
+ */
+
+#include <linux/errno.h>
+#include <linux/filter.h>
+#include <linux/bpf.h>
+#include <asm/cpu-features.h>
+#include <asm/isa-rev.h>
+#include <asm/uasm.h>
+
+#include "bpf_jit_comp.h"
+
+/* MIPS t0-t3 are not available in the n64 ABI */
+#undef MIPS_R_T0
+#undef MIPS_R_T1
+#undef MIPS_R_T2
+#undef MIPS_R_T3
+
+/* Stack is 16-byte aligned in n64 ABI */
+#define MIPS_STACK_ALIGNMENT 16
+
+/* Extra 64-bit eBPF registers used by JIT */
+#define JIT_REG_TC (MAX_BPF_JIT_REG + 0)
+#define JIT_REG_ZX (MAX_BPF_JIT_REG + 1)
+
+/* Number of prologue bytes to skip when doing a tail call */
+#define JIT_TCALL_SKIP 4
+
+/* Callee-saved CPU registers that the JIT must preserve */
+#define JIT_CALLEE_REGS   \
+	(BIT(MIPS_R_S0) | \
+	 BIT(MIPS_R_S1) | \
+	 BIT(MIPS_R_S2) | \
+	 BIT(MIPS_R_S3) | \
+	 BIT(MIPS_R_S4) | \
+	 BIT(MIPS_R_S5) | \
+	 BIT(MIPS_R_S6) | \
+	 BIT(MIPS_R_S7) | \
+	 BIT(MIPS_R_GP) | \
+	 BIT(MIPS_R_FP) | \
+	 BIT(MIPS_R_RA))
+
+/* Caller-saved CPU registers available for JIT use */
+#define JIT_CALLER_REGS	  \
+	(BIT(MIPS_R_A5) | \
+	 BIT(MIPS_R_A6) | \
+	 BIT(MIPS_R_A7))
+/*
+ * Mapping of 64-bit eBPF registers to 64-bit native MIPS registers.
+ * MIPS registers t4 - t7 may be used by the JIT as temporary registers.
+ * MIPS registers t8 - t9 are reserved for single-register common functions.
+ */
+static const u8 bpf2mips64[] = {
+	/* Return value from in-kernel function, and exit value from eBPF */
+	[BPF_REG_0] = MIPS_R_V0,
+	/* Arguments from eBPF program to in-kernel function */
+	[BPF_REG_1] = MIPS_R_A0,
+	[BPF_REG_2] = MIPS_R_A1,
+	[BPF_REG_3] = MIPS_R_A2,
+	[BPF_REG_4] = MIPS_R_A3,
+	[BPF_REG_5] = MIPS_R_A4,
+	/* Callee-saved registers that in-kernel function will preserve */
+	[BPF_REG_6] = MIPS_R_S0,
+	[BPF_REG_7] = MIPS_R_S1,
+	[BPF_REG_8] = MIPS_R_S2,
+	[BPF_REG_9] = MIPS_R_S3,
+	/* Read-only frame pointer to access the eBPF stack */
+	[BPF_REG_FP] = MIPS_R_FP,
+	/* Temporary register for blinding constants */
+	[BPF_REG_AX] = MIPS_R_AT,
+	/* Tail call count register, caller-saved */
+	[JIT_REG_TC] = MIPS_R_A5,
+	/* Constant for register zero-extension */
+	[JIT_REG_ZX] = MIPS_R_V1,
+};
+
+/*
+ * MIPS 32-bit operations on 64-bit registers generate a sign-extended
+ * result. However, the eBPF ISA mandates zero-extension, so we rely on the
+ * verifier to add that for us (emit_zext_ver). In addition, ALU arithmetic
+ * operations, right shift and byte swap require properly sign-extended
+ * operands or the result is unpredictable. We emit explicit sign-extensions
+ * in those cases.
+ */
+
+/* Sign extension */
+static void emit_sext(struct jit_context *ctx, u8 dst, u8 src)
+{
+	emit(ctx, sll, dst, src, 0);
+	clobber_reg(ctx, dst);
+}
+
+/* Zero extension */
+static void emit_zext(struct jit_context *ctx, u8 dst)
+{
+	if (cpu_has_mips64r2 || cpu_has_mips64r6) {
+		emit(ctx, dinsu, dst, MIPS_R_ZERO, 32, 32);
+	} else {
+		emit(ctx, and, dst, dst, bpf2mips64[JIT_REG_ZX]);
+		access_reg(ctx, JIT_REG_ZX); /* We need the ZX register */
+	}
+	clobber_reg(ctx, dst);
+}
+
+/* Zero extension, if verifier does not do it for us  */
+static void emit_zext_ver(struct jit_context *ctx, u8 dst)
+{
+	if (!ctx->program->aux->verifier_zext)
+		emit_zext(ctx, dst);
+}
+
+/* dst = imm (64-bit) */
+static void emit_mov_i64(struct jit_context *ctx, u8 dst, u64 imm64)
+{
+	if (imm64 >= 0xffffffffffff8000ULL || imm64 < 0x8000ULL) {
+		emit(ctx, daddiu, dst, MIPS_R_ZERO, (s16)imm64);
+	} else if (imm64 >= 0xffffffff80000000ULL ||
+		   (imm64 < 0x80000000 && imm64 > 0xffff)) {
+		emit(ctx, lui, dst, (s16)(imm64 >> 16));
+		emit(ctx, ori, dst, dst, (u16)imm64 & 0xffff);
+	} else {
+		u8 acc = MIPS_R_ZERO;
+		int shift = 0;
+		int k;
+
+		for (k = 0; k < 4; k++) {
+			u16 half = imm64 >> (48 - 16 * k);
+
+			if (acc == dst)
+				shift += 16;
+
+			if (half) {
+				if (shift)
+					emit(ctx, dsll_safe, dst, dst, shift);
+				emit(ctx, ori, dst, acc, half);
+				acc = dst;
+				shift = 0;
+			}
+		}
+		if (shift)
+			emit(ctx, dsll_safe, dst, dst, shift);
+	}
+	clobber_reg(ctx, dst);
+}
+
+/* ALU immediate operation (64-bit) */
+static void emit_alu_i64(struct jit_context *ctx, u8 dst, s32 imm, u8 op)
+{
+	switch (BPF_OP(op)) {
+	/* dst = dst | imm */
+	case BPF_OR:
+		emit(ctx, ori, dst, dst, (u16)imm);
+		break;
+	/* dst = dst ^ imm */
+	case BPF_XOR:
+		emit(ctx, xori, dst, dst, (u16)imm);
+		break;
+	/* dst = -dst */
+	case BPF_NEG:
+		emit(ctx, dsubu, dst, MIPS_R_ZERO, dst);
+		break;
+	/* dst = dst << imm */
+	case BPF_LSH:
+		emit(ctx, dsll_safe, dst, dst, imm);
+		break;
+	/* dst = dst >> imm */
+	case BPF_RSH:
+		emit(ctx, dsrl_safe, dst, dst, imm);
+		break;
+	/* dst = dst >> imm (arithmetic) */
+	case BPF_ARSH:
+		emit(ctx, dsra_safe, dst, dst, imm);
+		break;
+	/* dst = dst + imm */
+	case BPF_ADD:
+		emit(ctx, daddiu, dst, dst, imm);
+		break;
+	/* dst = dst - imm */
+	case BPF_SUB:
+		emit(ctx, daddiu, dst, dst, -imm);
+		break;
+	default:
+		/* Width-generic operations */
+		emit_alu_i(ctx, dst, imm, op);
+	}
+	clobber_reg(ctx, dst);
+}
+
+/* ALU register operation (64-bit) */
+static void emit_alu_r64(struct jit_context *ctx, u8 dst, u8 src, u8 op)
+{
+	switch (BPF_OP(op)) {
+	/* dst = dst << src */
+	case BPF_LSH:
+		emit(ctx, dsllv, dst, dst, src);
+		break;
+	/* dst = dst >> src */
+	case BPF_RSH:
+		emit(ctx, dsrlv, dst, dst, src);
+		break;
+	/* dst = dst >> src (arithmetic) */
+	case BPF_ARSH:
+		emit(ctx, dsrav, dst, dst, src);
+		break;
+	/* dst = dst + src */
+	case BPF_ADD:
+		emit(ctx, daddu, dst, dst, src);
+		break;
+	/* dst = dst - src */
+	case BPF_SUB:
+		emit(ctx, dsubu, dst, dst, src);
+		break;
+	/* dst = dst * src */
+	case BPF_MUL:
+		if (cpu_has_mips64r6) {
+			emit(ctx, dmulu, dst, dst, src);
+		} else {
+			emit(ctx, dmultu, dst, src);
+			emit(ctx, mflo, dst);
+		}
+		break;
+	/* dst = dst / src */
+	case BPF_DIV:
+		if (cpu_has_mips64r6) {
+			emit(ctx, ddivu_r6, dst, dst, src);
+		} else {
+			emit(ctx, ddivu, dst, src);
+			emit(ctx, mflo, dst);
+		}
+		break;
+	/* dst = dst % src */
+	case BPF_MOD:
+		if (cpu_has_mips64r6) {
+			emit(ctx, dmodu, dst, dst, src);
+		} else {
+			emit(ctx, ddivu, dst, src);
+			emit(ctx, mfhi, dst);
+		}
+		break;
+	default:
+		/* Width-generic operations */
+		emit_alu_r(ctx, dst, src, op);
+	}
+	clobber_reg(ctx, dst);
+}
+
+/* Swap sub words in a register double word */
+static void emit_swap_r64(struct jit_context *ctx, u8 dst, u8 mask, u32 bits)
+{
+	u8 tmp = MIPS_R_T9;
+
+	emit(ctx, and, tmp, dst, mask);  /* tmp = dst & mask  */
+	emit(ctx, dsll, tmp, tmp, bits); /* tmp = tmp << bits */
+	emit(ctx, dsrl, dst, dst, bits); /* dst = dst >> bits */
+	emit(ctx, and, dst, dst, mask);  /* dst = dst & mask  */
+	emit(ctx, or, dst, dst, tmp);    /* dst = dst | tmp   */
+}
+
+/* Swap bytes and truncate a register double word, word or half word */
+static void emit_bswap_r64(struct jit_context *ctx, u8 dst, u32 width)
+{
+	switch (width) {
+	/* Swap bytes in a double word */
+	case 64:
+		if (cpu_has_mips64r2 || cpu_has_mips64r6) {
+			emit(ctx, dsbh, dst, dst);
+			emit(ctx, dshd, dst, dst);
+		} else {
+			u8 t1 = MIPS_R_T6;
+			u8 t2 = MIPS_R_T7;
+
+			emit(ctx, dsll32, t2, dst, 0);  /* t2 = dst << 32    */
+			emit(ctx, dsrl32, dst, dst, 0); /* dst = dst >> 32   */
+			emit(ctx, or, dst, dst, t2);    /* dst = dst | t2    */
+
+			emit(ctx, ori, t2, MIPS_R_ZERO, 0xffff);
+			emit(ctx, dsll32, t1, t2, 0);   /* t1 = t2 << 32     */
+			emit(ctx, or, t1, t1, t2);      /* t1 = t1 | t2      */
+			emit_swap_r64(ctx, dst, t1, 16);/* dst = swap16(dst) */
+
+			emit(ctx, lui, t2, 0xff);       /* t2 = 0x00ff0000   */
+			emit(ctx, ori, t2, t2, 0xff);   /* t2 = t2 | 0x00ff  */
+			emit(ctx, dsll32, t1, t2, 0);   /* t1 = t2 << 32     */
+			emit(ctx, or, t1, t1, t2);      /* t1 = t1 | t2      */
+			emit_swap_r64(ctx, dst, t1, 8); /* dst = swap8(dst)  */
+		}
+		break;
+	/* Swap bytes in a half word */
+	/* Swap bytes in a word */
+	case 32:
+	case 16:
+		emit_sext(ctx, dst, dst);
+		emit_bswap_r(ctx, dst, width);
+		if (cpu_has_mips64r2 || cpu_has_mips64r6)
+			emit_zext(ctx, dst);
+		break;
+	}
+	clobber_reg(ctx, dst);
+}
+
+/* Truncate a register double word, word or half word */
+static void emit_trunc_r64(struct jit_context *ctx, u8 dst, u32 width)
+{
+	switch (width) {
+	case 64:
+		break;
+	/* Zero-extend a word */
+	case 32:
+		emit_zext(ctx, dst);
+		break;
+	/* Zero-extend a half word */
+	case 16:
+		emit(ctx, andi, dst, dst, 0xffff);
+		break;
+	}
+	clobber_reg(ctx, dst);
+}
+
+/* Load operation: dst = *(size*)(src + off) */
+static void emit_ldx(struct jit_context *ctx, u8 dst, u8 src, s16 off, u8 size)
+{
+	switch (size) {
+	/* Load a byte */
+	case BPF_B:
+		emit(ctx, lbu, dst, off, src);
+		break;
+	/* Load a half word */
+	case BPF_H:
+		emit(ctx, lhu, dst, off, src);
+		break;
+	/* Load a word */
+	case BPF_W:
+		emit(ctx, lwu, dst, off, src);
+		break;
+	/* Load a double word */
+	case BPF_DW:
+		emit(ctx, ld, dst, off, src);
+		break;
+	}
+	clobber_reg(ctx, dst);
+}
+
+/* Store operation: *(size *)(dst + off) = src */
+static void emit_stx(struct jit_context *ctx, u8 dst, u8 src, s16 off, u8 size)
+{
+	switch (size) {
+	/* Store a byte */
+	case BPF_B:
+		emit(ctx, sb, src, off, dst);
+		break;
+	/* Store a half word */
+	case BPF_H:
+		emit(ctx, sh, src, off, dst);
+		break;
+	/* Store a word */
+	case BPF_W:
+		emit(ctx, sw, src, off, dst);
+		break;
+	/* Store a double word */
+	case BPF_DW:
+		emit(ctx, sd, src, off, dst);
+		break;
+	}
+}
+
+/* Atomic read-modify-write */
+static void emit_atomic_r64(struct jit_context *ctx,
+			    u8 dst, u8 src, s16 off, u8 code)
+{
+	u8 t1 = MIPS_R_T6;
+	u8 t2 = MIPS_R_T7;
+
+	LLSC_sync(ctx);
+	emit(ctx, lld, t1, off, dst);
+	switch (code) {
+	case BPF_ADD:
+	case BPF_ADD | BPF_FETCH:
+		emit(ctx, daddu, t2, t1, src);
+		break;
+	case BPF_AND:
+	case BPF_AND | BPF_FETCH:
+		emit(ctx, and, t2, t1, src);
+		break;
+	case BPF_OR:
+	case BPF_OR | BPF_FETCH:
+		emit(ctx, or, t2, t1, src);
+		break;
+	case BPF_XOR:
+	case BPF_XOR | BPF_FETCH:
+		emit(ctx, xor, t2, t1, src);
+		break;
+	case BPF_XCHG:
+		emit(ctx, move, t2, src);
+		break;
+	}
+	emit(ctx, scd, t2, off, dst);
+	emit(ctx, LLSC_beqz, t2, -16 - LLSC_offset);
+	emit(ctx, nop); /* Delay slot */
+
+	if (code & BPF_FETCH) {
+		emit(ctx, move, src, t1);
+		clobber_reg(ctx, src);
+	}
+}
+
+/* Atomic compare-and-exchange */
+static void emit_cmpxchg_r64(struct jit_context *ctx, u8 dst, u8 src, s16 off)
+{
+	u8 r0 = bpf2mips64[BPF_REG_0];
+	u8 t1 = MIPS_R_T6;
+	u8 t2 = MIPS_R_T7;
+
+	LLSC_sync(ctx);
+	emit(ctx, lld, t1, off, dst);
+	emit(ctx, bne, t1, r0, 12);
+	emit(ctx, move, t2, src);      /* Delay slot */
+	emit(ctx, scd, t2, off, dst);
+	emit(ctx, LLSC_beqz, t2, -20 - LLSC_offset);
+	emit(ctx, move, r0, t1);       /* Delay slot */
+
+	clobber_reg(ctx, r0);
+}
+
+/* Function call */
+static int emit_call(struct jit_context *ctx, const struct bpf_insn *insn)
+{
+	u8 zx = bpf2mips64[JIT_REG_ZX];
+	u8 tmp = MIPS_R_T6;
+	bool fixed;
+	u64 addr;
+
+	/* Decode the call address */
+	if (bpf_jit_get_func_addr(ctx->program, insn, false,
+				  &addr, &fixed) < 0)
+		return -1;
+	if (!fixed)
+		return -1;
+
+	/* Push caller-saved registers on stack */
+	push_regs(ctx, ctx->clobbered & JIT_CALLER_REGS, 0, 0);
+
+	/* Emit function call */
+	emit_mov_i64(ctx, tmp, addr & JALR_MASK);
+	emit(ctx, jalr, MIPS_R_RA, tmp);
+	emit(ctx, nop); /* Delay slot */
+
+	/* Restore caller-saved registers */
+	pop_regs(ctx, ctx->clobbered & JIT_CALLER_REGS, 0, 0);
+
+	/* Re-initialize the JIT zero-extension register if accessed */
+	if (ctx->accessed & BIT(JIT_REG_ZX)) {
+		emit(ctx, daddiu, zx, MIPS_R_ZERO, -1);
+		emit(ctx, dsrl32, zx, zx, 0);
+	}
+
+	clobber_reg(ctx, MIPS_R_RA);
+	clobber_reg(ctx, MIPS_R_V0);
+	clobber_reg(ctx, MIPS_R_V1);
+	return 0;
+}
+
+/* Function tail call */
+static int emit_tail_call(struct jit_context *ctx)
+{
+	u8 ary = bpf2mips64[BPF_REG_2];
+	u8 ind = bpf2mips64[BPF_REG_3];
+	u8 tcc = bpf2mips64[JIT_REG_TC];
+	u8 tmp = MIPS_R_T6;
+	int off;
+
+	/*
+	 * Tail call:
+	 * eBPF R1 - function argument (context ptr), passed in a0-a1
+	 * eBPF R2 - ptr to object with array of function entry points
+	 * eBPF R3 - array index of function to be called
+	 */
+
+	/* if (ind >= ary->map.max_entries) goto out */
+	off = offsetof(struct bpf_array, map.max_entries);
+	if (off > 0x7fff)
+		return -1;
+	emit(ctx, lwu, tmp, off, ary);            /* tmp = ary->map.max_entrs*/
+	emit(ctx, sltu, tmp, ind, tmp);           /* tmp = ind < t1          */
+	emit(ctx, beqz, tmp, get_offset(ctx, 1)); /* PC += off(1) if tmp == 0*/
+
+	/* if (--TCC < 0) goto out */
+	emit(ctx, daddiu, tcc, tcc, -1);          /* tcc-- (delay slot)      */
+	emit(ctx, bltz, tcc, get_offset(ctx, 1)); /* PC += off(1) if tcc < 0 */
+						  /* (next insn delay slot)  */
+	/* prog = ary->ptrs[ind] */
+	off = offsetof(struct bpf_array, ptrs);
+	if (off > 0x7fff)
+		return -1;
+	emit(ctx, dsll, tmp, ind, 3);             /* tmp = ind << 3          */
+	emit(ctx, daddu, tmp, tmp, ary);          /* tmp += ary              */
+	emit(ctx, ld, tmp, off, tmp);             /* tmp = *(tmp + off)      */
+
+	/* if (prog == 0) goto out */
+	emit(ctx, beqz, tmp, get_offset(ctx, 1)); /* PC += off(1) if tmp == 0*/
+	emit(ctx, nop);                           /* Delay slot              */
+
+	/* func = prog->bpf_func + 8 (prologue skip offset) */
+	off = offsetof(struct bpf_prog, bpf_func);
+	if (off > 0x7fff)
+		return -1;
+	emit(ctx, ld, tmp, off, tmp);                /* tmp = *(tmp + off)   */
+	emit(ctx, daddiu, tmp, tmp, JIT_TCALL_SKIP); /* tmp += skip (4)      */
+
+	/* goto func */
+	build_epilogue(ctx, tmp);
+	access_reg(ctx, JIT_REG_TC);
+	return 0;
+}
+
+/*
+ * Stack frame layout for a JITed program (stack grows down).
+ *
+ * Higher address  : Previous stack frame      :
+ *                 +===========================+  <--- MIPS sp before call
+ *                 | Callee-saved registers,   |
+ *                 | including RA and FP       |
+ *                 +---------------------------+  <--- eBPF FP (MIPS fp)
+ *                 | Local eBPF variables      |
+ *                 | allocated by program      |
+ *                 +---------------------------+
+ *                 | Reserved for caller-saved |
+ *                 | registers                 |
+ * Lower address   +===========================+  <--- MIPS sp
+ */
+
+/* Build program prologue to set up the stack and registers */
+void build_prologue(struct jit_context *ctx)
+{
+	u8 fp = bpf2mips64[BPF_REG_FP];
+	u8 tc = bpf2mips64[JIT_REG_TC];
+	u8 zx = bpf2mips64[JIT_REG_ZX];
+	int stack, saved, locals, reserved;
+
+	/*
+	 * In the unlikely event that the TCC limit is raised to more
+	 * than 16 bits, it is clamped to the maximum value allowed for
+	 * the generated code (0xffff). It is better fail to compile
+	 * instead of degrading gracefully.
+	 */
+	BUILD_BUG_ON(MAX_TAIL_CALL_CNT > 0xffff);
+
+	/*
+	 * The first instruction initializes the tail call count register.
+	 * On a tail call, the calling function jumps into the prologue
+	 * after this instruction.
+	 */
+	emit(ctx, ori, tc, MIPS_R_ZERO, MAX_TAIL_CALL_CNT);
+
+	/* === Entry-point for tail calls === */
+
+	/*
+	 * If the eBPF frame pointer and tail call count registers were
+	 * accessed they must be preserved. Mark them as clobbered here
+	 * to save and restore them on the stack as needed.
+	 */
+	if (ctx->accessed & BIT(BPF_REG_FP))
+		clobber_reg(ctx, fp);
+	if (ctx->accessed & BIT(JIT_REG_TC))
+		clobber_reg(ctx, tc);
+	if (ctx->accessed & BIT(JIT_REG_ZX))
+		clobber_reg(ctx, zx);
+
+	/* Compute the stack space needed for callee-saved registers */
+	saved = hweight32(ctx->clobbered & JIT_CALLEE_REGS) * sizeof(u64);
+	saved = ALIGN(saved, MIPS_STACK_ALIGNMENT);
+
+	/* Stack space used by eBPF program local data */
+	locals = ALIGN(ctx->program->aux->stack_depth, MIPS_STACK_ALIGNMENT);
+
+	/*
+	 * If we are emitting function calls, reserve extra stack space for
+	 * caller-saved registers needed by the JIT. The required space is
+	 * computed automatically during resource usage discovery (pass 1).
+	 */
+	reserved = ctx->stack_used;
+
+	/* Allocate the stack frame */
+	stack = ALIGN(saved + locals + reserved, MIPS_STACK_ALIGNMENT);
+	if (stack)
+		emit(ctx, daddiu, MIPS_R_SP, MIPS_R_SP, -stack);
+
+	/* Store callee-saved registers on stack */
+	push_regs(ctx, ctx->clobbered & JIT_CALLEE_REGS, 0, stack - saved);
+
+	/* Initialize the eBPF frame pointer if accessed */
+	if (ctx->accessed & BIT(BPF_REG_FP))
+		emit(ctx, daddiu, fp, MIPS_R_SP, stack - saved);
+
+	/* Initialize the ePF JIT zero-extension register if accessed */
+	if (ctx->accessed & BIT(JIT_REG_ZX)) {
+		emit(ctx, daddiu, zx, MIPS_R_ZERO, -1);
+		emit(ctx, dsrl32, zx, zx, 0);
+	}
+
+	ctx->saved_size = saved;
+	ctx->stack_size = stack;
+}
+
+/* Build the program epilogue to restore the stack and registers */
+void build_epilogue(struct jit_context *ctx, int dest_reg)
+{
+	/* Restore callee-saved registers from stack */
+	pop_regs(ctx, ctx->clobbered & JIT_CALLEE_REGS, 0,
+		 ctx->stack_size - ctx->saved_size);
+
+	/* Release the stack frame */
+	if (ctx->stack_size)
+		emit(ctx, daddiu, MIPS_R_SP, MIPS_R_SP, ctx->stack_size);
+
+	/* Jump to return address and sign-extend the 32-bit return value */
+	emit(ctx, jr, dest_reg);
+	emit(ctx, sll, MIPS_R_V0, MIPS_R_V0, 0); /* Delay slot */
+}
+
+/* Build one eBPF instruction */
+int build_insn(const struct bpf_insn *insn, struct jit_context *ctx)
+{
+	u8 dst = bpf2mips64[insn->dst_reg];
+	u8 src = bpf2mips64[insn->src_reg];
+	u8 res = bpf2mips64[BPF_REG_0];
+	u8 code = insn->code;
+	s16 off = insn->off;
+	s32 imm = insn->imm;
+	s32 val, rel;
+	u8 alu, jmp;
+
+	switch (code) {
+	/* ALU operations */
+	/* dst = imm */
+	case BPF_ALU | BPF_MOV | BPF_K:
+		emit_mov_i(ctx, dst, imm);
+		emit_zext_ver(ctx, dst);
+		break;
+	/* dst = src */
+	case BPF_ALU | BPF_MOV | BPF_X:
+		if (imm == 1) {
+			/* Special mov32 for zext */
+			emit_zext(ctx, dst);
+		} else {
+			emit_mov_r(ctx, dst, src);
+			emit_zext_ver(ctx, dst);
+		}
+		break;
+	/* dst = -dst */
+	case BPF_ALU | BPF_NEG:
+		emit_sext(ctx, dst, dst);
+		emit_alu_i(ctx, dst, 0, BPF_NEG);
+		emit_zext_ver(ctx, dst);
+		break;
+	/* dst = dst & imm */
+	/* dst = dst | imm */
+	/* dst = dst ^ imm */
+	/* dst = dst << imm */
+	case BPF_ALU | BPF_OR | BPF_K:
+	case BPF_ALU | BPF_AND | BPF_K:
+	case BPF_ALU | BPF_XOR | BPF_K:
+	case BPF_ALU | BPF_LSH | BPF_K:
+		if (!valid_alu_i(BPF_OP(code), imm)) {
+			emit_mov_i(ctx, MIPS_R_T4, imm);
+			emit_alu_r(ctx, dst, MIPS_R_T4, BPF_OP(code));
+		} else if (rewrite_alu_i(BPF_OP(code), imm, &alu, &val)) {
+			emit_alu_i(ctx, dst, val, alu);
+		}
+		emit_zext_ver(ctx, dst);
+		break;
+	/* dst = dst >> imm */
+	/* dst = dst >> imm (arithmetic) */
+	/* dst = dst + imm */
+	/* dst = dst - imm */
+	/* dst = dst * imm */
+	/* dst = dst / imm */
+	/* dst = dst % imm */
+	case BPF_ALU | BPF_RSH | BPF_K:
+	case BPF_ALU | BPF_ARSH | BPF_K:
+	case BPF_ALU | BPF_ADD | BPF_K:
+	case BPF_ALU | BPF_SUB | BPF_K:
+	case BPF_ALU | BPF_MUL | BPF_K:
+	case BPF_ALU | BPF_DIV | BPF_K:
+	case BPF_ALU | BPF_MOD | BPF_K:
+		if (!valid_alu_i(BPF_OP(code), imm)) {
+			emit_sext(ctx, dst, dst);
+			emit_mov_i(ctx, MIPS_R_T4, imm);
+			emit_alu_r(ctx, dst, MIPS_R_T4, BPF_OP(code));
+		} else if (rewrite_alu_i(BPF_OP(code), imm, &alu, &val)) {
+			emit_sext(ctx, dst, dst);
+			emit_alu_i(ctx, dst, val, alu);
+		}
+		emit_zext_ver(ctx, dst);
+		break;
+	/* dst = dst & src */
+	/* dst = dst | src */
+	/* dst = dst ^ src */
+	/* dst = dst << src */
+	case BPF_ALU | BPF_AND | BPF_X:
+	case BPF_ALU | BPF_OR | BPF_X:
+	case BPF_ALU | BPF_XOR | BPF_X:
+	case BPF_ALU | BPF_LSH | BPF_X:
+		emit_alu_r(ctx, dst, src, BPF_OP(code));
+		emit_zext_ver(ctx, dst);
+		break;
+	/* dst = dst >> src */
+	/* dst = dst >> src (arithmetic) */
+	/* dst = dst + src */
+	/* dst = dst - src */
+	/* dst = dst * src */
+	/* dst = dst / src */
+	/* dst = dst % src */
+	case BPF_ALU | BPF_RSH | BPF_X:
+	case BPF_ALU | BPF_ARSH | BPF_X:
+	case BPF_ALU | BPF_ADD | BPF_X:
+	case BPF_ALU | BPF_SUB | BPF_X:
+	case BPF_ALU | BPF_MUL | BPF_X:
+	case BPF_ALU | BPF_DIV | BPF_X:
+	case BPF_ALU | BPF_MOD | BPF_X:
+		emit_sext(ctx, dst, dst);
+		emit_sext(ctx, MIPS_R_T4, src);
+		emit_alu_r(ctx, dst, MIPS_R_T4, BPF_OP(code));
+		emit_zext_ver(ctx, dst);
+		break;
+	/* dst = imm (64-bit) */
+	case BPF_ALU64 | BPF_MOV | BPF_K:
+		emit_mov_i(ctx, dst, imm);
+		break;
+	/* dst = src (64-bit) */
+	case BPF_ALU64 | BPF_MOV | BPF_X:
+		emit_mov_r(ctx, dst, src);
+		break;
+	/* dst = -dst (64-bit) */
+	case BPF_ALU64 | BPF_NEG:
+		emit_alu_i64(ctx, dst, 0, BPF_NEG);
+		break;
+	/* dst = dst & imm (64-bit) */
+	/* dst = dst | imm (64-bit) */
+	/* dst = dst ^ imm (64-bit) */
+	/* dst = dst << imm (64-bit) */
+	/* dst = dst >> imm (64-bit) */
+	/* dst = dst >> imm ((64-bit, arithmetic) */
+	/* dst = dst + imm (64-bit) */
+	/* dst = dst - imm (64-bit) */
+	/* dst = dst * imm (64-bit) */
+	/* dst = dst / imm (64-bit) */
+	/* dst = dst % imm (64-bit) */
+	case BPF_ALU64 | BPF_AND | BPF_K:
+	case BPF_ALU64 | BPF_OR | BPF_K:
+	case BPF_ALU64 | BPF_XOR | BPF_K:
+	case BPF_ALU64 | BPF_LSH | BPF_K:
+	case BPF_ALU64 | BPF_RSH | BPF_K:
+	case BPF_ALU64 | BPF_ARSH | BPF_K:
+	case BPF_ALU64 | BPF_ADD | BPF_K:
+	case BPF_ALU64 | BPF_SUB | BPF_K:
+	case BPF_ALU64 | BPF_MUL | BPF_K:
+	case BPF_ALU64 | BPF_DIV | BPF_K:
+	case BPF_ALU64 | BPF_MOD | BPF_K:
+		if (!valid_alu_i(BPF_OP(code), imm)) {
+			emit_mov_i(ctx, MIPS_R_T4, imm);
+			emit_alu_r64(ctx, dst, MIPS_R_T4, BPF_OP(code));
+		} else if (rewrite_alu_i(BPF_OP(code), imm, &alu, &val)) {
+			emit_alu_i64(ctx, dst, val, alu);
+		}
+		break;
+	/* dst = dst & src (64-bit) */
+	/* dst = dst | src (64-bit) */
+	/* dst = dst ^ src (64-bit) */
+	/* dst = dst << src (64-bit) */
+	/* dst = dst >> src (64-bit) */
+	/* dst = dst >> src (64-bit, arithmetic) */
+	/* dst = dst + src (64-bit) */
+	/* dst = dst - src (64-bit) */
+	/* dst = dst * src (64-bit) */
+	/* dst = dst / src (64-bit) */
+	/* dst = dst % src (64-bit) */
+	case BPF_ALU64 | BPF_AND | BPF_X:
+	case BPF_ALU64 | BPF_OR | BPF_X:
+	case BPF_ALU64 | BPF_XOR | BPF_X:
+	case BPF_ALU64 | BPF_LSH | BPF_X:
+	case BPF_ALU64 | BPF_RSH | BPF_X:
+	case BPF_ALU64 | BPF_ARSH | BPF_X:
+	case BPF_ALU64 | BPF_ADD | BPF_X:
+	case BPF_ALU64 | BPF_SUB | BPF_X:
+	case BPF_ALU64 | BPF_MUL | BPF_X:
+	case BPF_ALU64 | BPF_DIV | BPF_X:
+	case BPF_ALU64 | BPF_MOD | BPF_X:
+		emit_alu_r64(ctx, dst, src, BPF_OP(code));
+		break;
+	/* dst = htole(dst) */
+	/* dst = htobe(dst) */
+	case BPF_ALU | BPF_END | BPF_FROM_LE:
+	case BPF_ALU | BPF_END | BPF_FROM_BE:
+		if (BPF_SRC(code) ==
+#ifdef __BIG_ENDIAN
+		    BPF_FROM_LE
+#else
+		    BPF_FROM_BE
+#endif
+		    )
+			emit_bswap_r64(ctx, dst, imm);
+		else
+			emit_trunc_r64(ctx, dst, imm);
+		break;
+	/* dst = imm64 */
+	case BPF_LD | BPF_IMM | BPF_DW:
+		emit_mov_i64(ctx, dst, (u32)imm | ((u64)insn[1].imm << 32));
+		return 1;
+	/* LDX: dst = *(size *)(src + off) */
+	case BPF_LDX | BPF_MEM | BPF_W:
+	case BPF_LDX | BPF_MEM | BPF_H:
+	case BPF_LDX | BPF_MEM | BPF_B:
+	case BPF_LDX | BPF_MEM | BPF_DW:
+		emit_ldx(ctx, dst, src, off, BPF_SIZE(code));
+		break;
+	/* ST: *(size *)(dst + off) = imm */
+	case BPF_ST | BPF_MEM | BPF_W:
+	case BPF_ST | BPF_MEM | BPF_H:
+	case BPF_ST | BPF_MEM | BPF_B:
+	case BPF_ST | BPF_MEM | BPF_DW:
+		emit_mov_i(ctx, MIPS_R_T4, imm);
+		emit_stx(ctx, dst, MIPS_R_T4, off, BPF_SIZE(code));
+		break;
+	/* STX: *(size *)(dst + off) = src */
+	case BPF_STX | BPF_MEM | BPF_W:
+	case BPF_STX | BPF_MEM | BPF_H:
+	case BPF_STX | BPF_MEM | BPF_B:
+	case BPF_STX | BPF_MEM | BPF_DW:
+		emit_stx(ctx, dst, src, off, BPF_SIZE(code));
+		break;
+	/* Speculation barrier */
+	case BPF_ST | BPF_NOSPEC:
+		break;
+	/* Atomics */
+	case BPF_STX | BPF_ATOMIC | BPF_W:
+	case BPF_STX | BPF_ATOMIC | BPF_DW:
+		switch (imm) {
+		case BPF_ADD:
+		case BPF_ADD | BPF_FETCH:
+		case BPF_AND:
+		case BPF_AND | BPF_FETCH:
+		case BPF_OR:
+		case BPF_OR | BPF_FETCH:
+		case BPF_XOR:
+		case BPF_XOR | BPF_FETCH:
+		case BPF_XCHG:
+			if (BPF_SIZE(code) == BPF_DW) {
+				emit_atomic_r64(ctx, dst, src, off, imm);
+			} else if (imm & BPF_FETCH) {
+				u8 tmp = dst;
+
+				if (src == dst) { /* Don't overwrite dst */
+					emit_mov_r(ctx, MIPS_R_T4, dst);
+					tmp = MIPS_R_T4;
+				}
+				emit_sext(ctx, src, src);
+				emit_atomic_r(ctx, tmp, src, off, imm);
+				emit_zext_ver(ctx, src);
+			} else { /* 32-bit, no fetch */
+				emit_sext(ctx, MIPS_R_T4, src);
+				emit_atomic_r(ctx, dst, MIPS_R_T4, off, imm);
+			}
+			break;
+		case BPF_CMPXCHG:
+			if (BPF_SIZE(code) == BPF_DW) {
+				emit_cmpxchg_r64(ctx, dst, src, off);
+			} else {
+				u8 tmp = res;
+
+				if (res == dst)   /* Don't overwrite dst */
+					tmp = MIPS_R_T4;
+				emit_sext(ctx, tmp, res);
+				emit_sext(ctx, MIPS_R_T5, src);
+				emit_cmpxchg_r(ctx, dst, MIPS_R_T5, tmp, off);
+				if (res == dst)   /* Restore result */
+					emit_mov_r(ctx, res, MIPS_R_T4);
+				/* Result zext inserted by verifier */
+			}
+			break;
+		default:
+			goto notyet;
+		}
+		break;
+	/* PC += off if dst == src */
+	/* PC += off if dst != src */
+	/* PC += off if dst & src */
+	/* PC += off if dst > src */
+	/* PC += off if dst >= src */
+	/* PC += off if dst < src */
+	/* PC += off if dst <= src */
+	/* PC += off if dst > src (signed) */
+	/* PC += off if dst >= src (signed) */
+	/* PC += off if dst < src (signed) */
+	/* PC += off if dst <= src (signed) */
+	case BPF_JMP32 | BPF_JEQ | BPF_X:
+	case BPF_JMP32 | BPF_JNE | BPF_X:
+	case BPF_JMP32 | BPF_JSET | BPF_X:
+	case BPF_JMP32 | BPF_JGT | BPF_X:
+	case BPF_JMP32 | BPF_JGE | BPF_X:
+	case BPF_JMP32 | BPF_JLT | BPF_X:
+	case BPF_JMP32 | BPF_JLE | BPF_X:
+	case BPF_JMP32 | BPF_JSGT | BPF_X:
+	case BPF_JMP32 | BPF_JSGE | BPF_X:
+	case BPF_JMP32 | BPF_JSLT | BPF_X:
+	case BPF_JMP32 | BPF_JSLE | BPF_X:
+		if (off == 0)
+			break;
+		setup_jmp_r(ctx, dst == src, BPF_OP(code), off, &jmp, &rel);
+		emit_sext(ctx, MIPS_R_T4, dst); /* Sign-extended dst */
+		emit_sext(ctx, MIPS_R_T5, src); /* Sign-extended src */
+		emit_jmp_r(ctx, MIPS_R_T4, MIPS_R_T5, rel, jmp);
+		if (finish_jmp(ctx, jmp, off) < 0)
+			goto toofar;
+		break;
+	/* PC += off if dst == imm */
+	/* PC += off if dst != imm */
+	/* PC += off if dst & imm */
+	/* PC += off if dst > imm */
+	/* PC += off if dst >= imm */
+	/* PC += off if dst < imm */
+	/* PC += off if dst <= imm */
+	/* PC += off if dst > imm (signed) */
+	/* PC += off if dst >= imm (signed) */
+	/* PC += off if dst < imm (signed) */
+	/* PC += off if dst <= imm (signed) */
+	case BPF_JMP32 | BPF_JEQ | BPF_K:
+	case BPF_JMP32 | BPF_JNE | BPF_K:
+	case BPF_JMP32 | BPF_JSET | BPF_K:
+	case BPF_JMP32 | BPF_JGT | BPF_K:
+	case BPF_JMP32 | BPF_JGE | BPF_K:
+	case BPF_JMP32 | BPF_JLT | BPF_K:
+	case BPF_JMP32 | BPF_JLE | BPF_K:
+	case BPF_JMP32 | BPF_JSGT | BPF_K:
+	case BPF_JMP32 | BPF_JSGE | BPF_K:
+	case BPF_JMP32 | BPF_JSLT | BPF_K:
+	case BPF_JMP32 | BPF_JSLE | BPF_K:
+		if (off == 0)
+			break;
+		setup_jmp_i(ctx, imm, 32, BPF_OP(code), off, &jmp, &rel);
+		emit_sext(ctx, MIPS_R_T4, dst); /* Sign-extended dst */
+		if (valid_jmp_i(jmp, imm)) {
+			emit_jmp_i(ctx, MIPS_R_T4, imm, rel, jmp);
+		} else {
+			/* Move large immediate to register, sign-extended */
+			emit_mov_i(ctx, MIPS_R_T5, imm);
+			emit_jmp_r(ctx, MIPS_R_T4, MIPS_R_T5, rel, jmp);
+		}
+		if (finish_jmp(ctx, jmp, off) < 0)
+			goto toofar;
+		break;
+	/* PC += off if dst == src */
+	/* PC += off if dst != src */
+	/* PC += off if dst & src */
+	/* PC += off if dst > src */
+	/* PC += off if dst >= src */
+	/* PC += off if dst < src */
+	/* PC += off if dst <= src */
+	/* PC += off if dst > src (signed) */
+	/* PC += off if dst >= src (signed) */
+	/* PC += off if dst < src (signed) */
+	/* PC += off if dst <= src (signed) */
+	case BPF_JMP | BPF_JEQ | BPF_X:
+	case BPF_JMP | BPF_JNE | BPF_X:
+	case BPF_JMP | BPF_JSET | BPF_X:
+	case BPF_JMP | BPF_JGT | BPF_X:
+	case BPF_JMP | BPF_JGE | BPF_X:
+	case BPF_JMP | BPF_JLT | BPF_X:
+	case BPF_JMP | BPF_JLE | BPF_X:
+	case BPF_JMP | BPF_JSGT | BPF_X:
+	case BPF_JMP | BPF_JSGE | BPF_X:
+	case BPF_JMP | BPF_JSLT | BPF_X:
+	case BPF_JMP | BPF_JSLE | BPF_X:
+		if (off == 0)
+			break;
+		setup_jmp_r(ctx, dst == src, BPF_OP(code), off, &jmp, &rel);
+		emit_jmp_r(ctx, dst, src, rel, jmp);
+		if (finish_jmp(ctx, jmp, off) < 0)
+			goto toofar;
+		break;
+	/* PC += off if dst == imm */
+	/* PC += off if dst != imm */
+	/* PC += off if dst & imm */
+	/* PC += off if dst > imm */
+	/* PC += off if dst >= imm */
+	/* PC += off if dst < imm */
+	/* PC += off if dst <= imm */
+	/* PC += off if dst > imm (signed) */
+	/* PC += off if dst >= imm (signed) */
+	/* PC += off if dst < imm (signed) */
+	/* PC += off if dst <= imm (signed) */
+	case BPF_JMP | BPF_JEQ | BPF_K:
+	case BPF_JMP | BPF_JNE | BPF_K:
+	case BPF_JMP | BPF_JSET | BPF_K:
+	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:
+	case BPF_JMP | BPF_JSGT | BPF_K:
+	case BPF_JMP | BPF_JSGE | BPF_K:
+	case BPF_JMP | BPF_JSLT | BPF_K:
+	case BPF_JMP | BPF_JSLE | BPF_K:
+		if (off == 0)
+			break;
+		setup_jmp_i(ctx, imm, 64, BPF_OP(code), off, &jmp, &rel);
+		if (valid_jmp_i(jmp, imm)) {
+			emit_jmp_i(ctx, dst, imm, rel, jmp);
+		} else {
+			/* Move large immediate to register */
+			emit_mov_i(ctx, MIPS_R_T4, imm);
+			emit_jmp_r(ctx, dst, MIPS_R_T4, rel, jmp);
+		}
+		if (finish_jmp(ctx, jmp, off) < 0)
+			goto toofar;
+		break;
+	/* PC += off */
+	case BPF_JMP | BPF_JA:
+		if (off == 0)
+			break;
+		if (emit_ja(ctx, off) < 0)
+			goto toofar;
+		break;
+	/* Tail call */
+	case BPF_JMP | BPF_TAIL_CALL:
+		if (emit_tail_call(ctx) < 0)
+			goto invalid;
+		break;
+	/* Function call */
+	case BPF_JMP | BPF_CALL:
+		if (emit_call(ctx, insn) < 0)
+			goto invalid;
+		break;
+	/* Function return */
+	case BPF_JMP | BPF_EXIT:
+		/*
+		 * Optimization: when last instruction is EXIT
+		 * simply continue to epilogue.
+		 */
+		if (ctx->bpf_index == ctx->program->len - 1)
+			break;
+		if (emit_exit(ctx) < 0)
+			goto toofar;
+		break;
+
+	default:
+invalid:
+		pr_err_once("unknown opcode %02x\n", code);
+		return -EINVAL;
+notyet:
+		pr_info_once("*** NOT YET: opcode %02x ***\n", code);
+		return -EFAULT;
+toofar:
+		pr_info_once("*** TOO FAR: jump at %u opcode %02x ***\n",
+			     ctx->bpf_index, code);
+		return -E2BIG;
+	}
+	return 0;
+}