Re: [RFC PATCH bpf-next] RV32G eBPF JIT

From: BjÃrn TÃpel
Date: Mon Jun 24 2019 - 06:12:00 EST

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On Sat, 22 Jun 2019 at 00:59, Luke Nelson <lukenels@xxxxxxxxxxxxxxxxx> wrote:
>
> From: Luke Nelson <luke.r.nels@xxxxxxxxx>
>

Yay! Thanks for working on this! Nice work!

> This is an eBPF JIT for RV32G, adapted from the JIT for RV64G.
> Any feedback would be greatly appreciated.
>
> It passes 359 out of 378 tests in test_bpf.ko. The failing tests are
> features that are not supported right now:
> - ALU64 DIV/MOD:
> These require loops to emulate on 32-bit hardware,
> and are not supported on other 32-bit JITs like
> ARM32.
> - BPF_XADD | BPF_DW:
> RV32G does not have atomic instructions for operating
> on double words. This is similar to ARM32.
> - Tail calls:
> I'm working on adding support for these now, but couldn't
> find any test cases that use them. What's the best way
> of testing tail call code?

Have a look at the selftests (tools/testing/selftests/). The bpf
section has a lot a tests involving tail calls, e.g. test_progs and
test_verifier.

> - Far branches
> These are not supported in RV64G either.

This would be really nice to have, now that the size of BPF programs
are getting larger.

I'll try to a review/test run when I have some time over!

BjÃrn

>
> There are two main changes required for this to work compared to the
> RV64 JIT.
>
> First, eBPF registers are 64-bit, while RV32G registers are 32-bit.
> I take an approach similar to ARM32: most BPF registers map directly to
> 2 RISC-V registers, while some reside in stack scratch space and must
> be saved / restored when used.
>
> Second, many 64-bit ALU operations do not trivially map to 32-bit
> operations. Operations that move bits between high and low words, such
> as ADD, LSH, MUL, and others must emulate the 64-bit behavior in terms
> of 32-bit instructions.
>
> Signed-off-by: Luke Nelson <luke.r.nels@xxxxxxxxx>
> Cc: Xi Wang <xi.wang@xxxxxxxxx>
> ---
> arch/riscv/Kconfig | 2 +-
> arch/riscv/net/Makefile | 7 +-
> arch/riscv/net/bpf_jit_comp32.c | 1460 +++++++++++++++++++++++++++++++
> 3 files changed, 1467 insertions(+), 2 deletions(-)
> create mode 100644 arch/riscv/net/bpf_jit_comp32.c
>
> diff --git a/arch/riscv/Kconfig b/arch/riscv/Kconfig
> index 0c4b12205632..153ff9ee6e6c 100644
> --- a/arch/riscv/Kconfig
> +++ b/arch/riscv/Kconfig
> @@ -49,7 +49,7 @@ config RISCV
> select GENERIC_IRQ_MULTI_HANDLER
> select ARCH_HAS_PTE_SPECIAL
> select ARCH_HAS_MMIOWB
> - select HAVE_EBPF_JIT if 64BIT
> + select HAVE_EBPF_JIT
>
> config MMU
> def_bool y
> diff --git a/arch/riscv/net/Makefile b/arch/riscv/net/Makefile
> index ec5b14763316..5511fb1dd40e 100644
> --- a/arch/riscv/net/Makefile
> +++ b/arch/riscv/net/Makefile
> @@ -1,2 +1,7 @@
> # SPDX-License-Identifier: GPL-2.0-only
> -obj-$(CONFIG_BPF_JIT) += bpf_jit_comp.o
> +
> +ifeq ($(CONFIG_ARCH_RV64I),y)
> + obj-$(CONFIG_BPF_JIT) += bpf_jit_comp.o
> +else
> + obj-$(CONFIG_BPF_JIT) += bpf_jit_comp32.o
> +endif
> diff --git a/arch/riscv/net/bpf_jit_comp32.c b/arch/riscv/net/bpf_jit_comp32.c
> new file mode 100644
> index 000000000000..8790fd931aed
> --- /dev/null
> +++ b/arch/riscv/net/bpf_jit_comp32.c
> @@ -0,0 +1,1460 @@
> +// SPDX-License-Identifier: GPL-2.0
> +/* BPF JIT compiler for RV32G
> + *
> + * Copyright(c) 2019 Luke Nelson <luke.r.nels@xxxxxxxxx>
> + * This code is based on the code and ideas from
> + * BjÃrn TÃpel <bjorn.topel@xxxxxxxxx>,
> + * who wrote the rv64g BPF JIT, and
> + * Shubham Bansal <illusionist.neo@xxxxxxxxx> and
> + * Mircea Gherzan <mgherzan@xxxxxxxxx>,
> + * who wrote the 32-bit ARM BPF JIT.
> + */
> +
> +#include <linux/bpf.h>
> +#include <linux/filter.h>
> +#include <asm/cacheflush.h>
> +
> +enum {
> + RV_REG_ZERO = 0, /* The constant value 0 */
> + RV_REG_RA = 1, /* Return address */
> + RV_REG_SP = 2, /* Stack pointer */
> + RV_REG_GP = 3, /* Global pointer */
> + RV_REG_TP = 4, /* Thread pointer */
> + RV_REG_T0 = 5, /* Temporaries */
> + RV_REG_T1 = 6,
> + RV_REG_T2 = 7,
> + RV_REG_FP = 8,
> + RV_REG_S1 = 9, /* Saved registers */
> + RV_REG_A0 = 10, /* Function argument/return values */
> + RV_REG_A1 = 11, /* Function arguments */
> + RV_REG_A2 = 12,
> + RV_REG_A3 = 13,
> + RV_REG_A4 = 14,
> + RV_REG_A5 = 15,
> + RV_REG_A6 = 16,
> + RV_REG_A7 = 17,
> + RV_REG_S2 = 18, /* Saved registers */
> + RV_REG_S3 = 19,
> + RV_REG_S4 = 20,
> + RV_REG_S5 = 21,
> + RV_REG_S6 = 22,
> + RV_REG_S7 = 23,
> + RV_REG_S8 = 24,
> + RV_REG_S9 = 25,
> + RV_REG_S10 = 26,
> + RV_REG_S11 = 27,
> + RV_REG_T3 = 28, /* Temporaries */
> + RV_REG_T4 = 29,
> + RV_REG_T5 = 30,
> + RV_REG_T6 = 31,
> +};
> +
> +enum {
> + /* Stack layout - these are offsets from (top of stack - 4) */
> + BPF_R6_HI,
> + BPF_R6_LO,
> + BPF_R7_HI,
> + BPF_R7_LO,
> + BPF_R8_HI,
> + BPF_R8_LO,
> + BPF_R9_HI,
> + BPF_R9_LO,
> + BPF_TC_HI,
> + BPF_TC_LO,
> + BPF_AX_HI,
> + BPF_AX_LO,
> + /* Stack space for BPF_REG_6, BPF_REG_7, BPF_REG_8, BPF_REG_9,
> + * BPF_REG_AX and tail call counts.
> + */
> + BPF_JIT_SCRATCH_REGS,
> +};
> +
> +#define STACK_OFFSET(k) (-4 - ((k) * 4))
> +
> +#define TMP_REG_1 (MAX_BPF_JIT_REG + 0) /* TEMP Register 1 */
> +#define TMP_REG_2 (MAX_BPF_JIT_REG + 1) /* TEMP Register 2 */
> +#define TCALL_CNT (MAX_BPF_JIT_REG + 2) /* Tail Call Count */
> +
> +static const s8 bpf2rv32[][2] = {
> + /* Return value from in-kernel function, and exit value from eBPF */
> + [BPF_REG_0] = {RV_REG_S2, RV_REG_S1},
> + /* Arguments from eBPF program to in-kernel function */
> + [BPF_REG_1] = {RV_REG_A1, RV_REG_A0},
> + [BPF_REG_2] = {RV_REG_A3, RV_REG_A2},
> + [BPF_REG_3] = {RV_REG_A5, RV_REG_A4},
> + [BPF_REG_4] = {RV_REG_A7, RV_REG_A6},
> + [BPF_REG_5] = {RV_REG_S4, RV_REG_S3},
> + /* Callee saved registers that in-kernel function will preserve */
> + /* Stored on stack scratch space */
> + [BPF_REG_6] = {STACK_OFFSET(BPF_R6_HI), STACK_OFFSET(BPF_R6_LO)},
> + [BPF_REG_7] = {STACK_OFFSET(BPF_R7_HI), STACK_OFFSET(BPF_R7_LO)},
> + [BPF_REG_8] = {STACK_OFFSET(BPF_R8_HI), STACK_OFFSET(BPF_R8_LO)},
> + [BPF_REG_9] = {STACK_OFFSET(BPF_R9_HI), STACK_OFFSET(BPF_R9_LO)},
> + /* Read only Frame Pointer to access Stack */
> + [BPF_REG_FP] = {RV_REG_S6, RV_REG_S5},
> + /* Temporary Register for internal BPF JIT, can be used
> + * for constant blindings and others. Save T0 and T1
> + * for use internal to one instruction.
> + */
> + [TMP_REG_1] = {RV_REG_T3, RV_REG_T2},
> + [TMP_REG_2] = {RV_REG_T5, RV_REG_T4},
> + /* Tail call count. Stored on stack scratch space. */
> + [TCALL_CNT] = {STACK_OFFSET(BPF_TC_HI), STACK_OFFSET(BPF_TC_LO)},
> + /* Temporary register for blinding constants.
> + * Stored on stack scratch space.
> + */
> + [BPF_REG_AX] = {STACK_OFFSET(BPF_AX_HI), STACK_OFFSET(BPF_AX_LO)},
> +};
> +
> +struct rv_jit_context {
> + struct bpf_prog *prog;
> + u32 *insns; /* RV insns */
> + int ninsns;
> + int epilogue_offset;
> + int *offset; /* BPF to RV */
> + unsigned long flags;
> + int stack_size;
> +};
> +
> +struct rv_jit_data {
> + struct bpf_binary_header *header;
> + u8 *image;
> + struct rv_jit_context ctx;
> +};
> +
> +static void emit(const u32 insn, struct rv_jit_context *ctx)
> +{
> + if (ctx->insns)
> + ctx->insns[ctx->ninsns] = insn;
> +
> + ctx->ninsns++;
> +}
> +
> +static u32 rv_r_insn(u8 funct7, u8 rs2, u8 rs1, u8 funct3, u8 rd, u8 opcode)
> +{
> + return (funct7 << 25) | (rs2 << 20) | (rs1 << 15) | (funct3 << 12) |
> + (rd << 7) | opcode;
> +}
> +
> +static u32 rv_i_insn(u16 imm11_0, u8 rs1, u8 funct3, u8 rd, u8 opcode)
> +{
> + return (imm11_0 << 20) | (rs1 << 15) | (funct3 << 12) | (rd << 7) |
> + opcode;
> +}
> +
> +static u32 rv_s_insn(u16 imm11_0, u8 rs2, u8 rs1, u8 funct3, u8 opcode)
> +{
> + u8 imm11_5 = imm11_0 >> 5, imm4_0 = imm11_0 & 0x1f;
> +
> + return (imm11_5 << 25) | (rs2 << 20) | (rs1 << 15) | (funct3 << 12) |
> + (imm4_0 << 7) | opcode;
> +}
> +
> +static u32 rv_sb_insn(u16 imm12_1, u8 rs2, u8 rs1, u8 funct3, u8 opcode)
> +{
> + u8 imm12 = ((imm12_1 & 0x800) >> 5) | ((imm12_1 & 0x3f0) >> 4);
> + u8 imm4_1 = ((imm12_1 & 0xf) << 1) | ((imm12_1 & 0x400) >> 10);
> +
> + return (imm12 << 25) | (rs2 << 20) | (rs1 << 15) | (funct3 << 12) |
> + (imm4_1 << 7) | opcode;
> +}
> +
> +static u32 rv_u_insn(u32 imm31_12, u8 rd, u8 opcode)
> +{
> + return (imm31_12 << 12) | (rd << 7) | opcode;
> +}
> +
> +static u32 rv_uj_insn(u32 imm20_1, u8 rd, u8 opcode)
> +{
> + u32 imm;
> +
> + imm = (imm20_1 & 0x80000) | ((imm20_1 & 0x3ff) << 9) |
> + ((imm20_1 & 0x400) >> 2) | ((imm20_1 & 0x7f800) >> 11);
> +
> + return (imm << 12) | (rd << 7) | opcode;
> +}
> +
> +static u32 rv_amo_insn(u8 funct5, u8 aq, u8 rl, u8 rs2, u8 rs1,
> + u8 funct3, u8 rd, u8 opcode)
> +{
> + u8 funct7 = (funct5 << 2) | (aq << 1) | rl;
> +
> + return rv_r_insn(funct7, rs2, rs1, funct3, rd, opcode);
> +}
> +
> +static u32 rv_addi(u8 rd, u8 rs1, u16 imm11_0)
> +{
> + return rv_i_insn(imm11_0, rs1, 0, rd, 0x13);
> +}
> +
> +static u32 rv_add(u8 rd, u8 rs1, u8 rs2)
> +{
> + return rv_r_insn(0, rs2, rs1, 0, rd, 0x33);
> +}
> +
> +static u32 rv_sub(u8 rd, u8 rs1, u8 rs2)
> +{
> + return rv_r_insn(0x20, rs2, rs1, 0, rd, 0x33);
> +}
> +
> +static u32 rv_and(u8 rd, u8 rs1, u8 rs2)
> +{
> + return rv_r_insn(0, rs2, rs1, 7, rd, 0x33);
> +}
> +
> +static u32 rv_or(u8 rd, u8 rs1, u8 rs2)
> +{
> + return rv_r_insn(0, rs2, rs1, 6, rd, 0x33);
> +}
> +
> +static u32 rv_xor(u8 rd, u8 rs1, u8 rs2)
> +{
> + return rv_r_insn(0, rs2, rs1, 4, rd, 0x33);
> +}
> +
> +static u32 rv_mul(u8 rd, u8 rs1, u8 rs2)
> +{
> + return rv_r_insn(1, rs2, rs1, 0, rd, 0x33);
> +}
> +
> +static u32 rv_mulhu(u8 rd, u8 rs1, u8 rs2)
> +{
> + return rv_r_insn(1, rs2, rs1, 3, rd, 0x33);
> +}
> +
> +static u32 rv_divu(u8 rd, u8 rs1, u8 rs2)
> +{
> + return rv_r_insn(1, rs2, rs1, 5, rd, 0x33);
> +}
> +
> +static u32 rv_remu(u8 rd, u8 rs1, u8 rs2)
> +{
> + return rv_r_insn(1, rs2, rs1, 7, rd, 0x33);
> +}
> +
> +static u32 rv_sll(u8 rd, u8 rs1, u8 rs2)
> +{
> + return rv_r_insn(0, rs2, rs1, 1, rd, 0x33);
> +}
> +
> +static u32 rv_srl(u8 rd, u8 rs1, u8 rs2)
> +{
> + return rv_r_insn(0, rs2, rs1, 5, rd, 0x33);
> +}
> +
> +static u32 rv_sra(u8 rd, u8 rs1, u8 rs2)
> +{
> + return rv_r_insn(0x20, rs2, rs1, 5, rd, 0x33);
> +}
> +
> +static u32 rv_sltu(u8 rd, u8 rs1, u8 rs2)
> +{
> + return rv_r_insn(0, rs2, rs1, 3, rd, 0x33);
> +}
> +
> +static u32 rv_lui(u8 rd, u32 imm31_12)
> +{
> + return rv_u_insn(imm31_12, rd, 0x37);
> +}
> +
> +static u32 rv_slli(u8 rd, u8 rs1, u16 imm11_0)
> +{
> + return rv_i_insn(imm11_0, rs1, 1, rd, 0x13);
> +}
> +
> +static u32 rv_srli(u8 rd, u8 rs1, u16 imm11_0)
> +{
> + return rv_i_insn(imm11_0, rs1, 5, rd, 0x13);
> +}
> +
> +static u32 rv_srai(u8 rd, u8 rs1, u16 imm11_0)
> +{
> + return rv_i_insn(0x400 | imm11_0, rs1, 5, rd, 0x13);
> +}
> +
> +static u32 rv_andi(u8 rd, u8 rs1, u16 imm11_0)
> +{
> + return rv_i_insn(imm11_0, rs1, 7, rd, 0x13);
> +}
> +
> +static u32 rv_jal(u8 rd, u32 imm20_1)
> +{
> + return rv_uj_insn(imm20_1, rd, 0x6f);
> +}
> +
> +static u32 rv_jalr(u8 rd, u8 rs1, u16 imm11_0)
> +{
> + return rv_i_insn(imm11_0, rs1, 0, rd, 0x67);
> +}
> +
> +static u32 rv_beq(u8 rs1, u8 rs2, u16 imm12_1)
> +{
> + return rv_sb_insn(imm12_1, rs2, rs1, 0, 0x63);
> +}
> +
> +static u32 rv_bltu(u8 rs1, u8 rs2, u16 imm12_1)
> +{
> + return rv_sb_insn(imm12_1, rs2, rs1, 6, 0x63);
> +}
> +
> +static u32 rv_bgeu(u8 rs1, u8 rs2, u16 imm12_1)
> +{
> + return rv_sb_insn(imm12_1, rs2, rs1, 7, 0x63);
> +}
> +
> +static u32 rv_bne(u8 rs1, u8 rs2, u16 imm12_1)
> +{
> + return rv_sb_insn(imm12_1, rs2, rs1, 1, 0x63);
> +}
> +
> +static u32 rv_blt(u8 rs1, u8 rs2, u16 imm12_1)
> +{
> + return rv_sb_insn(imm12_1, rs2, rs1, 4, 0x63);
> +}
> +
> +static u32 rv_bge(u8 rs1, u8 rs2, u16 imm12_1)
> +{
> + return rv_sb_insn(imm12_1, rs2, rs1, 5, 0x63);
> +}
> +
> +static u32 rv_sb(u8 rs1, u16 imm11_0, u8 rs2)
> +{
> + return rv_s_insn(imm11_0, rs2, rs1, 0, 0x23);
> +}
> +
> +static u32 rv_sh(u8 rs1, u16 imm11_0, u8 rs2)
> +{
> + return rv_s_insn(imm11_0, rs2, rs1, 1, 0x23);
> +}
> +
> +static u32 rv_sw(u8 rs1, u16 imm11_0, u8 rs2)
> +{
> + return rv_s_insn(imm11_0, rs2, rs1, 2, 0x23);
> +}
> +
> +static u32 rv_lbu(u8 rd, u16 imm11_0, u8 rs1)
> +{
> + return rv_i_insn(imm11_0, rs1, 4, rd, 0x03);
> +}
> +
> +static u32 rv_lhu(u8 rd, u16 imm11_0, u8 rs1)
> +{
> + return rv_i_insn(imm11_0, rs1, 5, rd, 0x03);
> +}
> +
> +static u32 rv_lw(u8 rd, u16 imm11_0, u8 rs1)
> +{
> + return rv_i_insn(imm11_0, rs1, 2, rd, 0x03);
> +}
> +
> +static u32 rv_amoadd_w(u8 rd, u8 rs2, u8 rs1, u8 aq, u8 rl)
> +{
> + return rv_amo_insn(0, aq, rl, rs2, rs1, 2, rd, 0x2f);
> +}
> +
> +static bool is_13b_int(s32 val)
> +{
> + return -(1 << 12) <= val && val < (1 << 12);
> +}
> +
> +static bool is_21b_int(s32 val)
> +{
> + return -(1L << 20) <= val && val < (1L << 20);
> +}
> +
> +static int is_13b_check(int off, int insn)
> +{
> + if (!is_13b_int(off)) {
> + pr_err("bpf-jit: insn=%d offset=%d not supported yet!\n",
> + insn, off);
> + return -1;
> + }
> + return 0;
> +}
> +
> +static int is_21b_check(int off, int insn)
> +{
> + if (!is_21b_int(off)) {
> + pr_err("bpf-jit: insn=%d offset=%d not supported yet!\n",
> + insn, off);
> + return -1;
> + }
> + return 0;
> +}
> +
> +static void emit_imm(const s8 rd, s32 imm, struct rv_jit_context *ctx)
> +{
> + u32 upper = (imm + (1 << 11)) >> 12;
> + u32 lower = imm & 0xfff;
> +
> + if (upper) {
> + emit(rv_lui(rd, upper), ctx);
> + emit(rv_addi(rd, rd, lower), ctx);
> + } else {
> + emit(rv_addi(rd, RV_REG_ZERO, lower), ctx);
> + }
> +}
> +
> +static void emit_imm32(const s8 *rd, s32 imm, struct rv_jit_context *ctx)
> +{
> + /* Emit immediate into lower bits */
> + emit_imm(rd[1], imm, ctx);
> +
> + /* Sign-extend into upper bits */
> + emit(rv_addi(rd[0], rd[1], 0), ctx);
> + emit(rv_srai(rd[0], rd[0], 31), ctx);
> +}
> +
> +static void emit_imm64(const s8 *rd, s32 imm_hi, s32 imm_lo,
> + struct rv_jit_context *ctx)
> +{
> + emit_imm(rd[1], imm_lo, ctx);
> + emit_imm(rd[0], imm_hi, ctx);
> +}
> +
> +static int rv_offset(int bpf_to, int bpf_from, struct rv_jit_context *ctx)
> +{
> + int from = ctx->offset[bpf_from] - 1, to = ctx->offset[bpf_to];
> +
> + return (to - from) << 2;
> +}
> +
> +static int epilogue_offset(struct rv_jit_context *ctx)
> +{
> + int to = ctx->epilogue_offset, from = ctx->ninsns;
> +
> + return (to - from) << 2;
> +}
> +
> +static void build_epilogue(struct rv_jit_context *ctx)
> +{
> + int stack_adjust = ctx->stack_size, store_offset = stack_adjust - 8;
> + const s8 *r0 = bpf2rv32[BPF_REG_0];
> +
> + store_offset -= 4 * BPF_JIT_SCRATCH_REGS;
> +
> + /* Set return value. */
> + emit(rv_addi(RV_REG_A0, r0[1], 0), ctx);
> + emit(rv_addi(RV_REG_A1, r0[0], 0), ctx);
> +
> + /* Restore callee-saved registers. */
> + emit(rv_lw(RV_REG_RA, store_offset - 0, RV_REG_SP), ctx);
> + emit(rv_lw(RV_REG_FP, store_offset - 4, RV_REG_SP), ctx);
> + emit(rv_lw(RV_REG_S1, store_offset - 8, RV_REG_SP), ctx);
> + emit(rv_lw(RV_REG_S2, store_offset - 12, RV_REG_SP), ctx);
> + emit(rv_lw(RV_REG_S3, store_offset - 16, RV_REG_SP), ctx);
> + emit(rv_lw(RV_REG_S4, store_offset - 20, RV_REG_SP), ctx);
> + emit(rv_lw(RV_REG_S5, store_offset - 24, RV_REG_SP), ctx);
> + emit(rv_lw(RV_REG_S6, store_offset - 28, RV_REG_SP), ctx);
> +
> + emit(rv_addi(RV_REG_SP, RV_REG_SP, stack_adjust), ctx);
> + emit(rv_jalr(RV_REG_ZERO, RV_REG_RA, 0), ctx);
> +}
> +
> +static int rv_offset_check(int *rvoff, s16 off, int insn,
> + struct rv_jit_context *ctx)
> +{
> + *rvoff = rv_offset(insn + off, insn, ctx);
> + return is_13b_check(*rvoff, insn);
> +}
> +
> +static bool is_stacked(s8 reg)
> +{
> + return reg < 0;
> +}
> +
> +static const s8 *rv32_bpf_get_reg64(const s8 *reg, const s8 *tmp,
> + struct rv_jit_context *ctx)
> +{
> + if (is_stacked(reg[0])) {
> + emit(rv_lw(tmp[0], reg[0], RV_REG_FP), ctx);
> + emit(rv_lw(tmp[1], reg[1], RV_REG_FP), ctx);
> + reg = tmp;
> + }
> + return reg;
> +}
> +
> +static void rv32_bpf_put_reg64(const s8 *reg, const s8 *src,
> + struct rv_jit_context *ctx)
> +{
> + if (is_stacked(reg[0])) {
> + emit(rv_sw(RV_REG_FP, reg[0], src[0]), ctx);
> + emit(rv_sw(RV_REG_FP, reg[1], src[1]), ctx);
> + }
> +}
> +
> +static const s8 *rv32_bpf_get_reg32(const s8 *reg, const s8 *tmp,
> + struct rv_jit_context *ctx)
> +{
> + if (is_stacked(reg[1])) {
> + emit(rv_lw(tmp[1], reg[1], RV_REG_FP), ctx);
> + reg = tmp;
> + }
> + return reg;
> +}
> +
> +static void rv32_bpf_put_reg32(const s8 *reg, const s8 *src,
> + struct rv_jit_context *ctx)
> +{
> + if (is_stacked(reg[1])) {
> + emit(rv_sw(RV_REG_FP, reg[1], src[1]), ctx);
> + emit(rv_sw(RV_REG_FP, reg[0], RV_REG_ZERO), ctx);
> + } else {
> + emit(rv_addi(reg[0], RV_REG_ZERO, 0), ctx);
> + }
> +}
> +
> +static void emit_rv32_alu_i64(const s8 dst[], s32 imm,
> + struct rv_jit_context *ctx,
> + const u8 op)
> +{
> + const s8 *tmp1 = bpf2rv32[TMP_REG_1];
> + const s8 *rd = rv32_bpf_get_reg64(dst, tmp1, ctx);
> +
> + switch (op) {
> + case BPF_MOV:
> + emit_imm32(rd, imm, ctx);
> + break;
> + }
> +
> + rv32_bpf_put_reg64(dst, rd, ctx);
> +}
> +
> +static void emit_rv32_alu_i32(const s8 dst[], s32 imm,
> + struct rv_jit_context *ctx,
> + const u8 op)
> +{
> + const s8 *tmp1 = bpf2rv32[TMP_REG_1];
> + const s8 *rd = rv32_bpf_get_reg32(dst, tmp1, ctx);
> +
> + switch (op) {
> + case BPF_MOV:
> + emit_imm32(rd, imm, ctx);
> + break;
> + }
> +
> + rv32_bpf_put_reg32(dst, rd, ctx);
> +}
> +
> +static void emit_rv32_alu_r64(const s8 dst[], const s8 src[],
> + struct rv_jit_context *ctx,
> + const u8 op)
> +{
> + const s8 *tmp1 = bpf2rv32[TMP_REG_1];
> + const s8 *tmp2 = bpf2rv32[TMP_REG_2];
> + const s8 *rd = rv32_bpf_get_reg64(dst, tmp1, ctx);
> + const s8 *rs = rv32_bpf_get_reg64(src, tmp2, ctx);
> +
> + switch (op) {
> + case BPF_MOV:
> + emit(rv_addi(rd[0], rs[0], 0), ctx);
> + emit(rv_addi(rd[1], rs[1], 0), ctx);
> + break;
> + case BPF_ADD:
> + emit(rv_addi(RV_REG_T0, rd[1], 0), ctx);
> + emit(rv_add(rd[1], rd[1], rs[1]), ctx);
> + emit(rv_sltu(RV_REG_T0, rd[1], RV_REG_T0), ctx);
> + emit(rv_add(rd[0], rd[0], rs[0]), ctx);
> + emit(rv_add(rd[0], rd[0], RV_REG_T0), ctx);
> + break;
> + case BPF_SUB:
> + emit(rv_addi(RV_REG_T0, rd[1], 0), ctx);
> + emit(rv_sub(rd[1], rd[1], rs[1]), ctx);
> + emit(rv_sltu(RV_REG_T0, RV_REG_T0, rd[1]), ctx);
> + emit(rv_sub(rd[0], rd[0], rs[0]), ctx);
> + emit(rv_sub(rd[0], rd[0], RV_REG_T0), ctx);
> + break;
> + case BPF_AND:
> + emit(rv_and(rd[0], rd[0], rs[0]), ctx);
> + emit(rv_and(rd[1], rd[1], rs[1]), ctx);
> + break;
> + case BPF_OR:
> + emit(rv_or(rd[0], rd[0], rs[0]), ctx);
> + emit(rv_or(rd[1], rd[1], rs[1]), ctx);
> + break;
> + case BPF_XOR:
> + emit(rv_xor(rd[0], rd[0], rs[0]), ctx);
> + emit(rv_xor(rd[1], rd[1], rs[1]), ctx);
> + break;
> + case BPF_MUL:
> + emit(rv_mul(RV_REG_T0, rs[0], rd[1]), ctx);
> + emit(rv_mul(rd[0], rd[0], rs[1]), ctx);
> + emit(rv_mulhu(RV_REG_T1, rd[1], rs[1]), ctx);
> + emit(rv_add(rd[0], rd[0], RV_REG_T0), ctx);
> + emit(rv_mul(rd[1], rd[1], rs[1]), ctx);
> + emit(rv_add(rd[0], rd[0], RV_REG_T1), ctx);
> + break;
> + case BPF_LSH:
> + emit(rv_addi(RV_REG_T0, rs[1], -32), ctx);
> + emit(rv_blt(RV_REG_T0, RV_REG_ZERO, 16 >> 1), ctx);
> +
> + emit(rv_sll(rd[0], rd[1], RV_REG_T0), ctx);
> + emit(rv_addi(rd[1], RV_REG_ZERO, 0), ctx);
> + emit(rv_jal(RV_REG_ZERO, 32 >> 1), ctx);
> +
> + emit(rv_addi(RV_REG_T1, RV_REG_ZERO, 31), ctx);
> + emit(rv_srli(RV_REG_T0, rd[1], 1), ctx);
> + emit(rv_sub(RV_REG_T1, RV_REG_T1, rs[1]), ctx);
> + emit(rv_srl(RV_REG_T0, RV_REG_T0, RV_REG_T1), ctx);
> + emit(rv_sll(rd[0], rd[0], rs[1]), ctx);
> + emit(rv_or(rd[0], RV_REG_T0, rd[0]), ctx);
> + emit(rv_sll(rd[1], rd[1], rs[1]), ctx);
> + break;
> + case BPF_RSH:
> + emit(rv_addi(RV_REG_T0, rs[1], -32), ctx);
> + emit(rv_blt(RV_REG_T0, RV_REG_ZERO, 16 >> 1), ctx);
> +
> + emit(rv_srl(rd[1], rd[0], RV_REG_T0), ctx);
> + emit(rv_addi(rd[0], RV_REG_ZERO, 0), ctx);
> + emit(rv_jal(RV_REG_ZERO, 32 >> 1), ctx);
> +
> + emit(rv_addi(RV_REG_T1, RV_REG_ZERO, 31), ctx);
> + emit(rv_slli(RV_REG_T0, rd[0], 1), ctx);
> + emit(rv_sub(RV_REG_T1, RV_REG_T1, rs[1]), ctx);
> + emit(rv_sll(RV_REG_T0, RV_REG_T0, RV_REG_T1), ctx);
> + emit(rv_srl(rd[1], rd[1], rs[1]), ctx);
> + emit(rv_or(rd[1], RV_REG_T0, rd[1]), ctx);
> + emit(rv_srl(rd[0], rd[0], rs[1]), ctx);
> + break;
> + case BPF_ARSH:
> + emit(rv_addi(RV_REG_T0, rs[1], -32), ctx);
> + emit(rv_blt(RV_REG_T0, RV_REG_ZERO, 16 >> 1), ctx);
> +
> + emit(rv_sra(rd[1], rd[0], RV_REG_T0), ctx);
> + emit(rv_srai(rd[0], rd[0], 0x1f), ctx);
> + emit(rv_jal(RV_REG_ZERO, 32 >> 1), ctx);
> +
> + emit(rv_addi(RV_REG_T1, RV_REG_ZERO, 31), ctx);
> + emit(rv_slli(RV_REG_T0, rd[0], 1), ctx);
> + emit(rv_sub(RV_REG_T1, RV_REG_T1, rs[1]), ctx);
> + emit(rv_sll(RV_REG_T0, RV_REG_T0, RV_REG_T1), ctx);
> + emit(rv_srl(rd[1], rd[1], rs[1]), ctx);
> + emit(rv_or(rd[1], RV_REG_T0, rd[1]), ctx);
> + emit(rv_sra(rd[0], rd[0], rs[1]), ctx);
> + break;
> + case BPF_NEG:
> + emit(rv_sub(rd[1], RV_REG_ZERO, rd[1]), ctx);
> + emit(rv_sltu(RV_REG_T0, RV_REG_ZERO, rd[1]), ctx);
> + emit(rv_sub(rd[0], RV_REG_ZERO, rd[0]), ctx);
> + emit(rv_sub(rd[0], rd[0], RV_REG_T0), ctx);
> + break;
> + }
> +
> + rv32_bpf_put_reg64(dst, rd, ctx);
> +}
> +
> +static void emit_rv32_alu_r32(const s8 dst[], const s8 src[],
> + struct rv_jit_context *ctx,
> + const u8 op)
> +{
> + const s8 *tmp1 = bpf2rv32[TMP_REG_1];
> + const s8 *tmp2 = bpf2rv32[TMP_REG_2];
> + const s8 *rd = rv32_bpf_get_reg32(dst, tmp1, ctx);
> + const s8 *rs = rv32_bpf_get_reg32(src, tmp2, ctx);
> +
> + switch (op) {
> + case BPF_MOV:
> + emit(rv_addi(rd[1], rs[1], 0), ctx);
> + break;
> + case BPF_ADD:
> + emit(rv_add(rd[1], rd[1], rs[1]), ctx);
> + break;
> + case BPF_SUB:
> + emit(rv_sub(rd[1], rd[1], rs[1]), ctx);
> + break;
> + case BPF_AND:
> + emit(rv_and(rd[1], rd[1], rs[1]), ctx);
> + break;
> + case BPF_OR:
> + emit(rv_or(rd[1], rd[1], rs[1]), ctx);
> + break;
> + case BPF_XOR:
> + emit(rv_xor(rd[1], rd[1], rs[1]), ctx);
> + break;
> + case BPF_MUL:
> + emit(rv_mul(rd[1], rd[1], rs[1]), ctx);
> + break;
> + case BPF_DIV:
> + emit(rv_divu(rd[1], rd[1], rs[1]), ctx);
> + break;
> + case BPF_MOD:
> + emit(rv_remu(rd[1], rd[1], rs[1]), ctx);
> + break;
> + case BPF_LSH:
> + emit(rv_sll(rd[1], rd[1], rs[1]), ctx);
> + break;
> + case BPF_RSH:
> + emit(rv_srl(rd[1], rd[1], rs[1]), ctx);
> + break;
> + case BPF_ARSH:
> + emit(rv_sra(rd[1], rd[1], rs[1]), ctx);
> + break;
> + case BPF_NEG:
> + emit(rv_sub(rd[1], RV_REG_ZERO, rd[1]), ctx);
> + break;
> + }
> +
> + rv32_bpf_put_reg32(dst, rd, ctx);
> +}
> +
> +static int emit_rv32_jump_r64(const s8 src1[], const s8 src2[],
> + s16 off, int insn,
> + struct rv_jit_context *ctx,
> + const u8 op)
> +{
> + int rvoff;
> + const s8 *tmp1 = bpf2rv32[TMP_REG_1];
> + const s8 *tmp2 = bpf2rv32[TMP_REG_2];
> + const s8 *rs1 = rv32_bpf_get_reg64(src1, tmp1, ctx);
> + const s8 *rs2 = rv32_bpf_get_reg64(src2, tmp2, ctx);
> +
> + if (rv_offset_check(&rvoff, off, insn, ctx))
> + return -1;
> +
> + switch (op) {
> + case BPF_JEQ:
> + emit(rv_bne(rs1[0], rs2[0], 8 >> 1), ctx);
> + emit(rv_beq(rs1[1], rs2[1], rvoff >> 1), ctx);
> + break;
> + case BPF_JNE:
> + emit(rv_bne(rs1[0], rs2[0], (rvoff + 4) >> 1), ctx);
> + emit(rv_bne(rs1[1], rs2[1], rvoff >> 1), ctx);
> + break;
> + case BPF_JLE:
> + emit(rv_bltu(rs1[0], rs2[0], (rvoff + 8) >> 1), ctx);
> + emit(rv_bltu(rs2[0], rs1[0], 8 >> 1), ctx);
> + emit(rv_bgeu(rs2[1], rs1[1], rvoff >> 1), ctx);
> + break;
> + case BPF_JLT:
> + emit(rv_bltu(rs1[0], rs2[0], (rvoff + 8) >> 1), ctx);
> + emit(rv_bltu(rs2[0], rs1[0], 8 >> 1), ctx);
> + emit(rv_bltu(rs1[1], rs2[1], rvoff >> 1), ctx);
> + break;
> + case BPF_JGE:
> + emit(rv_bltu(rs2[0], rs1[0], (rvoff + 8) >> 1), ctx);
> + emit(rv_bltu(rs1[0], rs2[0], 8 >> 1), ctx);
> + emit(rv_bgeu(rs1[1], rs2[1], rvoff >> 1), ctx);
> + break;
> + case BPF_JGT:
> + emit(rv_bltu(rs2[0], rs1[0], (rvoff + 8) >> 1), ctx);
> + emit(rv_bltu(rs1[0], rs2[0], 8 >> 1), ctx);
> + emit(rv_bltu(rs2[1], rs1[1], rvoff >> 1), ctx);
> + break;
> + case BPF_JSLE:
> + emit(rv_blt(rs1[0], rs2[0], (rvoff + 8) >> 1), ctx);
> + emit(rv_bne(rs2[0], rs1[0], 8 >> 1), ctx);
> + emit(rv_bgeu(rs2[1], rs1[1], rvoff >> 1), ctx);
> + break;
> + case BPF_JSLT:
> + emit(rv_blt(rs1[0], rs2[0], (rvoff + 8) >> 1), ctx);
> + emit(rv_bne(rs2[0], rs1[0], 8 >> 1), ctx);
> + emit(rv_bltu(rs1[1], rs2[1], rvoff >> 1), ctx);
> + break;
> + case BPF_JSGE:
> + emit(rv_blt(rs2[0], rs1[0], (rvoff + 8) >> 1), ctx);
> + emit(rv_bne(rs1[0], rs2[0], 8 >> 1), ctx);
> + emit(rv_bgeu(rs1[1], rs2[1], rvoff >> 1), ctx);
> + break;
> + case BPF_JSGT:
> + emit(rv_blt(rs2[0], rs1[0], (rvoff + 8) >> 1), ctx);
> + emit(rv_bne(rs1[0], rs2[0], 8 >> 1), ctx);
> + emit(rv_bltu(rs2[1], rs1[1], rvoff >> 1), ctx);
> + break;
> + case BPF_JSET:
> + emit(rv_and(RV_REG_T0, rs1[0], rs2[0]), ctx);
> + emit(rv_bne(RV_REG_T0, RV_REG_ZERO, (rvoff + 8) >> 1), ctx);
> + emit(rv_and(RV_REG_T0, rs1[1], rs2[1]), ctx);
> + emit(rv_bne(RV_REG_T0, RV_REG_ZERO, rvoff >> 1), ctx);
> + break;
> + }
> +
> + return 0;
> +}
> +
> +static int emit_rv32_jump_r32(const s8 src1[], const s8 src2[],
> + s16 off, int insn,
> + struct rv_jit_context *ctx,
> + const u8 op)
> +{
> + int rvoff;
> + const s8 *tmp1 = bpf2rv32[TMP_REG_1];
> + const s8 *tmp2 = bpf2rv32[TMP_REG_2];
> + const s8 *rs1 = rv32_bpf_get_reg32(src1, tmp1, ctx);
> + const s8 *rs2 = rv32_bpf_get_reg32(src2, tmp2, ctx);
> +
> + if (rv_offset_check(&rvoff, off, insn, ctx))
> + return -1;
> +
> + switch (op) {
> + case BPF_JEQ:
> + emit(rv_beq(rs1[1], rs2[1], rvoff >> 1), ctx);
> + break;
> + case BPF_JNE:
> + emit(rv_bne(rs1[1], rs2[1], rvoff >> 1), ctx);
> + break;
> + case BPF_JLE:
> + emit(rv_bgeu(rs2[1], rs1[1], rvoff >> 1), ctx);
> + break;
> + case BPF_JLT:
> + emit(rv_bltu(rs1[1], rs2[1], rvoff >> 1), ctx);
> + break;
> + case BPF_JGE:
> + emit(rv_bgeu(rs1[1], rs2[1], rvoff >> 1), ctx);
> + break;
> + case BPF_JGT:
> + emit(rv_bltu(rs2[1], rs1[1], rvoff >> 1), ctx);
> + break;
> + case BPF_JSLE:
> + emit(rv_bge(rs2[1], rs1[1], rvoff >> 1), ctx);
> + break;
> + case BPF_JSLT:
> + emit(rv_blt(rs1[1], rs2[1], rvoff >> 1), ctx);
> + break;
> + case BPF_JSGE:
> + emit(rv_bge(rs1[1], rs2[1], rvoff >> 1), ctx);
> + break;
> + case BPF_JSGT:
> + emit(rv_blt(rs2[1], rs1[1], rvoff >> 1), ctx);
> + break;
> + case BPF_JSET:
> + emit(rv_and(RV_REG_T0, rs1[1], rs2[1]), ctx);
> + emit(rv_bne(RV_REG_T0, RV_REG_ZERO, rvoff >> 1), ctx);
> + break;
> + }
> +
> + return 0;
> +}
> +
> +static int emit_rv32_load_r64(const s8 dst[], const s8 src[],
> + s16 off,
> + struct rv_jit_context *ctx,
> + const u8 size)
> +{
> + const s8 *tmp1 = bpf2rv32[TMP_REG_1];
> + const s8 *tmp2 = bpf2rv32[TMP_REG_2];
> + const s8 *rd = rv32_bpf_get_reg64(dst, tmp1, ctx);
> + const s8 *rs = rv32_bpf_get_reg64(src, tmp2, ctx);
> +
> + emit_imm(RV_REG_T0, off, ctx);
> + emit(rv_add(RV_REG_T0, RV_REG_T0, rs[1]), ctx);
> +
> + switch (size) {
> + case BPF_B:
> + emit(rv_lbu(rd[1], 0, RV_REG_T0), ctx);
> + emit(rv_addi(rd[0], RV_REG_ZERO, 0), ctx);
> + break;
> + case BPF_H:
> + emit(rv_lhu(rd[1], 0, RV_REG_T0), ctx);
> + emit(rv_addi(rd[0], RV_REG_ZERO, 0), ctx);
> + break;
> + case BPF_W:
> + emit(rv_lw(rd[1], 0, RV_REG_T0), ctx);
> + emit(rv_addi(rd[0], RV_REG_ZERO, 0), ctx);
> + break;
> + case BPF_DW:
> + emit(rv_lw(rd[1], 0, RV_REG_T0), ctx);
> + emit(rv_lw(rd[0], 4, RV_REG_T0), ctx);
> + break;
> + }
> +
> + rv32_bpf_put_reg64(dst, rd, ctx);
> + return 0;
> +}
> +
> +static int emit_rv32_store_r64(const s8 dst[], const s8 src[],
> + s16 off,
> + struct rv_jit_context *ctx,
> + const u8 size, const u8 mode)
> +{
> + const s8 *tmp1 = bpf2rv32[TMP_REG_1];
> + const s8 *tmp2 = bpf2rv32[TMP_REG_2];
> + const s8 *rd = rv32_bpf_get_reg64(dst, tmp1, ctx);
> + const s8 *rs = rv32_bpf_get_reg64(src, tmp2, ctx);
> +
> + if (mode == BPF_XADD && size != BPF_W)
> + return -1;
> +
> + emit_imm(RV_REG_T0, off, ctx);
> + emit(rv_add(RV_REG_T0, RV_REG_T0, rd[1]), ctx);
> +
> + switch (size) {
> + case BPF_B:
> + emit(rv_sb(RV_REG_T0, 0, rs[1]), ctx);
> + break;
> + case BPF_H:
> + emit(rv_sh(RV_REG_T0, 0, rs[1]), ctx);
> + break;
> + case BPF_W:
> + switch (mode) {
> + case BPF_MEM:
> + emit(rv_sw(RV_REG_T0, 0, rs[1]), ctx);
> + break;
> + case BPF_XADD:
> + emit(rv_amoadd_w(RV_REG_ZERO, rs[1], RV_REG_T0, 0, 0), ctx);
> + break;
> + }
> + break;
> + case BPF_DW:
> + emit(rv_sw(RV_REG_T0, 0, rs[1]), ctx);
> + emit(rv_sw(RV_REG_T0, 4, rs[0]), ctx);
> + break;
> + }
> +
> + return 0;
> +}
> +
> +static void emit_rv32_rev16(const s8 rd, struct rv_jit_context *ctx)
> +{
> + emit(rv_addi(RV_REG_T1, RV_REG_ZERO, 0), ctx);
> +
> + emit(rv_andi(RV_REG_T0, rd, 0xff), ctx);
> + emit(rv_add(RV_REG_T1, RV_REG_T1, RV_REG_T0), ctx);
> + emit(rv_slli(RV_REG_T1, RV_REG_T1, 8), ctx);
> + emit(rv_srli(rd, rd, 8), ctx);
> +
> + emit(rv_andi(RV_REG_T0, rd, 0xff), ctx);
> + emit(rv_add(RV_REG_T1, RV_REG_T1, RV_REG_T0), ctx);
> +
> + emit(rv_addi(rd, RV_REG_T1, 0), ctx);
> +}
> +
> +static void emit_rv32_rev32(const s8 rd, struct rv_jit_context *ctx)
> +{
> + emit(rv_addi(RV_REG_T1, RV_REG_ZERO, 0), ctx);
> +
> + emit(rv_andi(RV_REG_T0, rd, 0xff), ctx);
> + emit(rv_add(RV_REG_T1, RV_REG_T1, RV_REG_T0), ctx);
> + emit(rv_slli(RV_REG_T1, RV_REG_T1, 8), ctx);
> + emit(rv_srli(rd, rd, 8), ctx);
> +
> + emit(rv_andi(RV_REG_T0, rd, 0xff), ctx);
> + emit(rv_add(RV_REG_T1, RV_REG_T1, RV_REG_T0), ctx);
> + emit(rv_slli(RV_REG_T1, RV_REG_T1, 8), ctx);
> + emit(rv_srli(rd, rd, 8), ctx);
> +
> + emit(rv_andi(RV_REG_T0, rd, 0xff), ctx);
> + emit(rv_add(RV_REG_T1, RV_REG_T1, RV_REG_T0), ctx);
> + emit(rv_slli(RV_REG_T1, RV_REG_T1, 8), ctx);
> + emit(rv_srli(rd, rd, 8), ctx);
> + emit(rv_andi(RV_REG_T0, rd, 0xff), ctx);
> + emit(rv_add(RV_REG_T1, RV_REG_T1, RV_REG_T0), ctx);
> +
> + emit(rv_addi(rd, RV_REG_T1, 0), ctx);
> +}
> +
> +static int emit_insn(const struct bpf_insn *insn,
> + struct rv_jit_context *ctx,
> + bool extra_pass)
> +{
> + int rvoff, i = insn - ctx->prog->insnsi;
> + u8 code = insn->code;
> + s16 off = insn->off;
> + s32 imm = insn->imm;
> +
> + const s8 *dst = bpf2rv32[insn->dst_reg];
> + const s8 *src = bpf2rv32[insn->src_reg];
> + const s8 *tmp1 = bpf2rv32[TMP_REG_1];
> + const s8 *tmp2 = bpf2rv32[TMP_REG_2];
> +
> + switch (code) {
> + case BPF_ALU64 | BPF_MOV | BPF_X:
> +
> + case BPF_ALU64 | BPF_ADD | BPF_X:
> + case BPF_ALU64 | BPF_ADD | BPF_K:
> +
> + case BPF_ALU64 | BPF_SUB | BPF_X:
> + case BPF_ALU64 | BPF_SUB | BPF_K:
> +
> + case BPF_ALU64 | BPF_AND | BPF_X:
> + case BPF_ALU64 | BPF_AND | BPF_K:
> +
> + case BPF_ALU64 | BPF_OR | BPF_X:
> + case BPF_ALU64 | BPF_OR | BPF_K:
> +
> + case BPF_ALU64 | BPF_XOR | BPF_X:
> + case BPF_ALU64 | BPF_XOR | BPF_K:
> +
> + case BPF_ALU64 | BPF_MUL | BPF_X:
> + case BPF_ALU64 | BPF_MUL | BPF_K:
> +
> + case BPF_ALU64 | BPF_LSH | BPF_X:
> + case BPF_ALU64 | BPF_LSH | BPF_K:
> +
> + case BPF_ALU64 | BPF_RSH | BPF_X:
> + case BPF_ALU64 | BPF_RSH | BPF_K:
> +
> + case BPF_ALU64 | BPF_ARSH | BPF_X:
> + case BPF_ALU64 | BPF_ARSH | BPF_K:
> + if (BPF_SRC(code) == BPF_K) {
> + emit_imm32(tmp2, imm, ctx);
> + src = tmp2;
> + }
> + emit_rv32_alu_r64(dst, src, ctx, BPF_OP(code));
> + break;
> +
> + case BPF_ALU64 | BPF_NEG:
> + emit_rv32_alu_r64(dst, tmp2, ctx, BPF_OP(code));
> + break;
> +
> + case BPF_ALU64 | BPF_DIV | BPF_X:
> + case BPF_ALU64 | BPF_DIV | BPF_K:
> + case BPF_ALU64 | BPF_MOD | BPF_X:
> + case BPF_ALU64 | BPF_MOD | BPF_K:
> + goto notsupported;
> +
> + case BPF_ALU64 | BPF_MOV | BPF_K:
> + emit_rv32_alu_i64(dst, imm, ctx, BPF_OP(code));
> + break;
> +
> + case BPF_ALU | BPF_MOV | BPF_X:
> +
> + case BPF_ALU | BPF_ADD | BPF_X:
> + case BPF_ALU | BPF_ADD | BPF_K:
> +
> + case BPF_ALU | BPF_SUB | BPF_X:
> + case BPF_ALU | BPF_SUB | BPF_K:
> +
> + case BPF_ALU | BPF_AND | BPF_X:
> + case BPF_ALU | BPF_AND | BPF_K:
> +
> + case BPF_ALU | BPF_OR | BPF_X:
> + case BPF_ALU | BPF_OR | BPF_K:
> +
> + case BPF_ALU | BPF_XOR | BPF_X:
> + case BPF_ALU | BPF_XOR | BPF_K:
> +
> + case BPF_ALU | BPF_MUL | BPF_X:
> + case BPF_ALU | BPF_MUL | BPF_K:
> +
> + case BPF_ALU | BPF_DIV | BPF_X:
> + case BPF_ALU | BPF_DIV | BPF_K:
> +
> + case BPF_ALU | BPF_MOD | BPF_X:
> + case BPF_ALU | BPF_MOD | BPF_K:
> +
> + case BPF_ALU | BPF_LSH | BPF_X:
> + case BPF_ALU | BPF_LSH | BPF_K:
> +
> + case BPF_ALU | BPF_RSH | BPF_X:
> + case BPF_ALU | BPF_RSH | BPF_K:
> +
> + case BPF_ALU | BPF_ARSH | BPF_X:
> + case BPF_ALU | BPF_ARSH | BPF_K:
> + if (BPF_SRC(code) == BPF_K) {
> + emit_imm32(tmp2, imm, ctx);
> + src = tmp2;
> + }
> + emit_rv32_alu_r32(dst, src, ctx, BPF_OP(code));
> + break;
> +
> + case BPF_ALU | BPF_MOV | BPF_K:
> + emit_rv32_alu_i32(dst, imm, ctx, BPF_OP(code));
> + break;
> +
> + case BPF_ALU | BPF_NEG:
> + /* src is ignored---choose a register known not to be stacked */
> + emit_rv32_alu_r32(dst, tmp2, ctx, BPF_OP(code));
> + break;
> +
> + case BPF_ALU | BPF_END | BPF_FROM_LE:
> + {
> + const s8 *rd = rv32_bpf_get_reg64(dst, tmp1, ctx);
> +
> + switch (imm) {
> + case 16:
> + emit(rv_slli(rd[1], rd[1], 16), ctx);
> + emit(rv_srli(rd[1], rd[1], 16), ctx);
> + /* Fallthrough to clear high bits. */
> + case 32:
> + emit(rv_addi(rd[0], RV_REG_ZERO, 0), ctx);
> + break;
> + case 64:
> + /* Do nothing. */
> + break;
> + default:
> + pr_err("bpf-jit: BPF_END imm %d invalid\n", imm);
> + return -1;
> + }
> +
> + rv32_bpf_put_reg64(dst, rd, ctx);
> + break;
> + }
> +
> + case BPF_ALU | BPF_END | BPF_FROM_BE:
> + {
> + const s8 *rd = rv32_bpf_get_reg64(dst, tmp1, ctx);
> +
> + switch (imm) {
> + case 16:
> + emit_rv32_rev16(rd[1], ctx);
> + emit(rv_addi(rd[0], RV_REG_ZERO, 0), ctx);
> + break;
> + case 32:
> + emit_rv32_rev32(rd[1], ctx);
> + emit(rv_addi(rd[0], RV_REG_ZERO, 0), ctx);
> + break;
> + case 64:
> + /* Swap upper and lower halves. */
> + emit(rv_addi(RV_REG_T0, rd[1], 0), ctx);
> + emit(rv_addi(rd[1], rd[0], 0), ctx);
> + emit(rv_addi(rd[0], RV_REG_T0, 0), ctx);
> +
> + /* Swap each half. */
> + emit_rv32_rev32(rd[1], ctx);
> + emit_rv32_rev32(rd[0], ctx);
> + break;
> + default:
> + pr_err("bpf-jit: BPF_END imm %d invalid\n", imm);
> + return -1;
> + }
> +
> + rv32_bpf_put_reg64(dst, rd, ctx);
> + break;
> + }
> +
> + case BPF_JMP | BPF_JA:
> + rvoff = rv_offset(i + off, i, ctx);
> + if (!is_21b_int(rvoff)) {
> + pr_err("bpf-jit: insn=%d offset=%d not supported yet!\n",
> + i, rvoff);
> + return -1;
> + }
> + emit(rv_jal(RV_REG_ZERO, rvoff >> 1), ctx);
> + break;
> +
> + case BPF_JMP | BPF_CALL:
> + {
> + bool fixed;
> + int ret;
> + u64 addr;
> + const s8 *r0 = bpf2rv32[BPF_REG_0];
> + const s8 *r5 = bpf2rv32[BPF_REG_5];
> +
> + ret = bpf_jit_get_func_addr(ctx->prog, insn, extra_pass, &addr,
> + &fixed);
> + if (ret < 0)
> + return ret;
> + if (fixed) {
> + emit_imm(RV_REG_T0, (u32) addr, ctx);
> + } else {
> + pr_err("bpf-jit: pseudocall call not supported yet!\n");
> + return -1;
> + }
> +
> + /* R1-R4 already in correct reigsters---need to push R5 to stack */
> + emit(rv_addi(RV_REG_SP, RV_REG_SP, -8), ctx);
> + emit(rv_sw(RV_REG_SP, 0, r5[1]), ctx);
> + emit(rv_sw(RV_REG_SP, 4, r5[0]), ctx);
> +
> + emit(rv_jalr(RV_REG_RA, RV_REG_T0, 0), ctx);
> +
> + /* Set return value */
> + emit(rv_addi(r0[1], RV_REG_A0, 0), ctx);
> + emit(rv_addi(r0[0], RV_REG_A1, 0), ctx);
> + emit(rv_addi(RV_REG_SP, RV_REG_SP, 8), ctx);
> + break;
> + }
> +
> + case BPF_JMP | BPF_JEQ | BPF_X:
> + case BPF_JMP | BPF_JEQ | BPF_K:
> + case BPF_JMP32 | BPF_JEQ | BPF_X:
> + case BPF_JMP32 | BPF_JEQ | BPF_K:
> +
> + case BPF_JMP | BPF_JNE | BPF_X:
> + case BPF_JMP | BPF_JNE | BPF_K:
> + case BPF_JMP32 | BPF_JNE | BPF_X:
> + case BPF_JMP32 | BPF_JNE | BPF_K:
> +
> + case BPF_JMP | BPF_JLE | BPF_X:
> + case BPF_JMP | BPF_JLE | BPF_K:
> + case BPF_JMP32 | BPF_JLE | BPF_X:
> + case BPF_JMP32 | BPF_JLE | BPF_K:
> +
> + case BPF_JMP | BPF_JLT | BPF_X:
> + case BPF_JMP | BPF_JLT | BPF_K:
> + case BPF_JMP32 | BPF_JLT | BPF_X:
> + case BPF_JMP32 | BPF_JLT | BPF_K:
> +
> + case BPF_JMP | BPF_JGE | BPF_X:
> + case BPF_JMP | BPF_JGE | BPF_K:
> + case BPF_JMP32 | BPF_JGE | BPF_X:
> + case BPF_JMP32 | BPF_JGE | BPF_K:
> +
> + case BPF_JMP | BPF_JGT | BPF_X:
> + case BPF_JMP | BPF_JGT | BPF_K:
> + case BPF_JMP32 | BPF_JGT | BPF_X:
> + case BPF_JMP32 | BPF_JGT | BPF_K:
> +
> + case BPF_JMP | BPF_JSLE | BPF_X:
> + case BPF_JMP | BPF_JSLE | BPF_K:
> + case BPF_JMP32 | BPF_JSLE | BPF_X:
> + case BPF_JMP32 | BPF_JSLE | BPF_K:
> +
> + case BPF_JMP | BPF_JSLT | BPF_X:
> + case BPF_JMP | BPF_JSLT | BPF_K:
> + case BPF_JMP32 | BPF_JSLT | BPF_X:
> + case BPF_JMP32 | BPF_JSLT | BPF_K:
> +
> + case BPF_JMP | BPF_JSGE | BPF_X:
> + case BPF_JMP | BPF_JSGE | BPF_K:
> + case BPF_JMP32 | BPF_JSGE | BPF_X:
> + case BPF_JMP32 | BPF_JSGE | BPF_K:
> +
> + case BPF_JMP | BPF_JSGT | BPF_X:
> + case BPF_JMP | BPF_JSGT | BPF_K:
> + case BPF_JMP32 | BPF_JSGT | BPF_X:
> + case BPF_JMP32 | BPF_JSGT | BPF_K:
> +
> + case BPF_JMP | BPF_JSET | BPF_X:
> + case BPF_JMP | BPF_JSET | BPF_K:
> + case BPF_JMP32 | BPF_JSET | BPF_X:
> + case BPF_JMP32 | BPF_JSET | BPF_K:
> + if (BPF_SRC(code) == BPF_K) {
> + emit_imm32(tmp2, imm, ctx);
> + src = tmp2;
> + }
> + switch (BPF_CLASS(code)) {
> + case BPF_JMP:
> + if (emit_rv32_jump_r64(dst, src, off, i, ctx, BPF_OP(code)))
> + return -1;
> + break;
> + case BPF_JMP32:
> + if (emit_rv32_jump_r32(dst, src, off, i, ctx, BPF_OP(code)))
> + return -1;
> + break;
> + }
> + break;
> +
> + case BPF_JMP | BPF_EXIT:
> + if (i == ctx->prog->len - 1)
> + break;
> +
> + rvoff = epilogue_offset(ctx);
> + if (is_21b_check(rvoff, i))
> + return -1;
> + emit(rv_jal(RV_REG_ZERO, rvoff >> 1), ctx);
> + break;
> +
> + case BPF_LD | BPF_IMM | BPF_DW:
> + {
> + struct bpf_insn insn1 = insn[1];
> + s32 imm_lo = imm;
> + s32 imm_hi = insn1.imm;
> + const s8 *rd = rv32_bpf_get_reg64(dst, tmp1, ctx);
> +
> + emit_imm64(rd, imm_hi, imm_lo, ctx);
> + rv32_bpf_put_reg64(dst, rd, ctx);
> + return 1;
> + }
> +
> + case BPF_LDX | BPF_MEM | BPF_B:
> + case BPF_LDX | BPF_MEM | BPF_H:
> + case BPF_LDX | BPF_MEM | BPF_W:
> + case BPF_LDX | BPF_MEM | BPF_DW:
> + if (emit_rv32_load_r64(dst, src, off, ctx, BPF_SIZE(code)))
> + return -1;
> + break;
> +
> +
> + case BPF_ST | BPF_MEM | BPF_B:
> + case BPF_STX | BPF_MEM | BPF_B:
> + case BPF_ST | BPF_MEM | BPF_H:
> + case BPF_STX | BPF_MEM | BPF_H:
> + case BPF_ST | BPF_MEM | BPF_W:
> + case BPF_STX | BPF_MEM | BPF_W:
> + case BPF_ST | BPF_MEM | BPF_DW:
> + case BPF_STX | BPF_MEM | BPF_DW:
> +
> + case BPF_STX | BPF_XADD | BPF_W:
> + if (BPF_CLASS(code) == BPF_ST) {
> + emit_imm32(tmp2, imm, ctx);
> + src = tmp2;
> + }
> +
> + if (emit_rv32_store_r64(dst, src, off, ctx, BPF_SIZE(code), BPF_MODE(code)))
> + return -1;
> + break;
> +
> + case BPF_STX | BPF_XADD | BPF_DW:
> + goto notsupported;
> +
> +notsupported:
> + pr_info_once("*** NOT SUPPORTED: opcode %02x ***\n", code);
> + return -EFAULT;
> +
> + default:
> + pr_err("bpf-jit: unknown opcode %02x\n", code);
> + return -EINVAL;
> + }
> +
> + return 0;
> +}
> +
> +static void build_prologue(struct rv_jit_context *ctx)
> +{
> + int stack_adjust = 32, store_offset, bpf_stack_adjust;
> +
> + stack_adjust = round_up(stack_adjust, 16);
> + bpf_stack_adjust = round_up(ctx->prog->aux->stack_depth, 16);
> + stack_adjust += bpf_stack_adjust;
> +
> + store_offset = stack_adjust - 8;
> +
> + stack_adjust += 4 * BPF_JIT_SCRATCH_REGS;
> +
> + emit(rv_addi(RV_REG_SP, RV_REG_SP, -stack_adjust), ctx);
> +
> + /* Save callee-save registers */
> + emit(rv_sw(RV_REG_SP, store_offset - 0, RV_REG_RA), ctx);
> + emit(rv_sw(RV_REG_SP, store_offset - 4, RV_REG_FP), ctx);
> + emit(rv_sw(RV_REG_SP, store_offset - 8, RV_REG_S1), ctx);
> + emit(rv_sw(RV_REG_SP, store_offset - 12, RV_REG_S2), ctx);
> + emit(rv_sw(RV_REG_SP, store_offset - 16, RV_REG_S3), ctx);
> + emit(rv_sw(RV_REG_SP, store_offset - 20, RV_REG_S4), ctx);
> + emit(rv_sw(RV_REG_SP, store_offset - 24, RV_REG_S5), ctx);
> + emit(rv_sw(RV_REG_SP, store_offset - 28, RV_REG_S6), ctx);
> +
> + emit(rv_addi(RV_REG_FP, RV_REG_SP, stack_adjust), ctx);
> +
> + /* Set up BPF stack pointer */
> + emit(rv_addi(bpf2rv32[BPF_REG_FP][1], RV_REG_SP, bpf_stack_adjust), ctx);
> + emit(rv_addi(bpf2rv32[BPF_REG_FP][0], RV_REG_ZERO, 0), ctx);
> +
> + /* Set up context pointer */
> + emit(rv_addi(bpf2rv32[BPF_REG_1][1], RV_REG_A0, 0), ctx);
> + emit(rv_addi(bpf2rv32[BPF_REG_1][0], RV_REG_ZERO, 0), ctx);
> +
> + ctx->stack_size = stack_adjust;
> +}
> +
> +static int build_body(struct rv_jit_context *ctx, bool extra_pass)
> +{
> + const struct bpf_prog *prog = ctx->prog;
> + int i;
> +
> + for (i = 0; i < prog->len; i++) {
> + const struct bpf_insn *insn = &prog->insnsi[i];
> + int ret;
> +
> + ret = emit_insn(insn, ctx, extra_pass);
> + if (ret > 0) {
> + i++;
> + if (ctx->insns == NULL)
> + ctx->offset[i] = ctx->ninsns;
> + continue;
> + }
> + if (ctx->insns == NULL)
> + ctx->offset[i] = ctx->ninsns;
> + if (ret)
> + return ret;
> + }
> + return 0;
> +}
> +
> +static void bpf_fill_ill_insns(void *area, unsigned int size)
> +{
> + memset(area, 0, size);
> +}
> +
> +static void bpf_flush_icache(void *start, void *end)
> +{
> + flush_icache_range((unsigned long)start, (unsigned long)end);
> +}
> +
> +struct bpf_prog *bpf_int_jit_compile(struct bpf_prog *prog)
> +{
> + bool tmp_blinded = false, extra_pass = false;
> + struct bpf_prog *tmp, *orig_prog = prog;
> + struct rv_jit_data *jit_data;
> + struct rv_jit_context *ctx;
> + unsigned int image_size;
> +
> + if (!prog->jit_requested)
> + return orig_prog;
> +
> + tmp = bpf_jit_blind_constants(prog);
> + if (IS_ERR(tmp))
> + return orig_prog;
> + if (tmp != prog) {
> + tmp_blinded = true;
> + prog = tmp;
> + }
> +
> + jit_data = prog->aux->jit_data;
> + if (!jit_data) {
> + jit_data = kzalloc(sizeof(*jit_data), GFP_KERNEL);
> + if (!jit_data) {
> + prog = orig_prog;
> + goto out;
> + }
> + prog->aux->jit_data = jit_data;
> + }
> +
> + ctx = &jit_data->ctx;
> +
> + if (ctx->offset) {
> + extra_pass = true;
> + image_size = sizeof(u32) * ctx->ninsns;
> + goto skip_init_ctx;
> + }
> +
> + ctx->prog = prog;
> + ctx->offset = kcalloc(prog->len, sizeof(int), GFP_KERNEL);
> + if (!ctx->offset) {
> + prog = orig_prog;
> + goto out_offset;
> + }
> +
> + /* First pass generates the ctx->offset, but does not emit an image. */
> + if (build_body(ctx, extra_pass)) {
> + prog = orig_prog;
> + goto out_offset;
> + }
> + build_prologue(ctx);
> + ctx->epilogue_offset = ctx->ninsns;
> + build_epilogue(ctx);
> +
> + /* Allocate image, now that we know the size. */
> + image_size = sizeof(u32) * ctx->ninsns;
> + jit_data->header = bpf_jit_binary_alloc(image_size, &jit_data->image,
> + sizeof(u32),
> + bpf_fill_ill_insns);
> + if (!jit_data->header) {
> + prog = orig_prog;
> + goto out_offset;
> + }
> +
> + /* Second, real pass, that acutally emits the image. */
> + ctx->insns = (u32 *)jit_data->image;
> +skip_init_ctx:
> + ctx->ninsns = 0;
> +
> + build_prologue(ctx);
> + if (build_body(ctx, extra_pass)) {
> + bpf_jit_binary_free(jit_data->header);
> + prog = orig_prog;
> + goto out_offset;
> + }
> + build_epilogue(ctx);
> +
> + if (bpf_jit_enable > 1)
> + bpf_jit_dump(prog->len, image_size, 2, ctx->insns);
> +
> + prog->bpf_func = (void *)ctx->insns;
> + prog->jited = 1;
> + prog->jited_len = image_size;
> +
> + bpf_flush_icache(jit_data->header, ctx->insns + ctx->ninsns);
> +
> + if (!prog->is_func || extra_pass) {
> +out_offset:
> + kfree(ctx->offset);
> + kfree(jit_data);
> + prog->aux->jit_data = NULL;
> + }
> +out:
> + if (tmp_blinded)
> + bpf_jit_prog_release_other(prog, prog == orig_prog ?
> + tmp : orig_prog);
> + return prog;
> +}
> --
> 2.20.1
>

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