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Message-Id: <20211005165408.2305108-5-johan.almbladh@anyfinetworks.com>
Date: Tue, 5 Oct 2021 18:54:05 +0200
From: Johan Almbladh <johan.almbladh@...finetworks.com>
To: ast@...nel.org, daniel@...earbox.net, andrii@...nel.org,
paulburton@...nel.org
Cc: kafai@...com, songliubraving@...com, yhs@...com,
john.fastabend@...il.com, kpsingh@...nel.org,
tsbogend@...ha.franken.de, chenhuacai@...nel.org,
jiaxun.yang@...goat.com, yangtiezhu@...ngson.cn,
tony.ambardar@...il.com, bpf@...r.kernel.org,
linux-mips@...r.kernel.org, netdev@...r.kernel.org,
Johan Almbladh <johan.almbladh@...finetworks.com>
Subject: [PATCH 4/7] mips: bpf: Add new eBPF JIT for 64-bit MIPS
This is an implementation on of an eBPF JIT for 64-bit MIPS III-V and
MIPS64r1-r6. It uses the same framework introduced by the 32-bit JIT.
Signed-off-by: Johan Almbladh <johan.almbladh@...finetworks.com>
---
arch/mips/net/bpf_jit_comp64.c | 1052 ++++++++++++++++++++++++++++++++
1 file changed, 1052 insertions(+)
create mode 100644 arch/mips/net/bpf_jit_comp64.c
diff --git a/arch/mips/net/bpf_jit_comp64.c b/arch/mips/net/bpf_jit_comp64.c
new file mode 100644
index 000000000000..ca49d3ef7ff4
--- /dev/null
+++ b/arch/mips/net/bpf_jit_comp64.c
@@ -0,0 +1,1052 @@
+// 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@...il.com>
+ *
+ * Based on code and ideas from
+ * Copyright (c) 2017 Cavium, Inc.
+ * Copyright (c) 2017 Shubham Bansal <illusionist.neo@...il.com>
+ * Copyright (c) 2011 Mircea Gherzan <mgherzan@...il.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 k;
+
+ for (k = 0; k < 4; k++) {
+ u16 half = imm64 >> (48 - 16 * k);
+
+ if (acc == dst)
+ emit(ctx, dsll, dst, dst, 16);
+
+ if (half) {
+ emit(ctx, ori, dst, acc, half);
+ acc = dst;
+ }
+ }
+ }
+ 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;
+
+ 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, beqz, t2, -16);
+ 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;
+
+ 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, beqz, t2, -20);
+ 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);
+ 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;
+
+ /*
+ * 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, addiu, tc, MIPS_R_ZERO, min(MAX_TAIL_CALL_CNT + 1, 0xffff));
+
+ /* === 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;
+}
--
2.30.2
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