summaryrefslogtreecommitdiff
path: root/arch/riscv/net/bpf_jit_comp.c
diff options
context:
space:
mode:
Diffstat (limited to 'arch/riscv/net/bpf_jit_comp.c')
-rw-r--r--arch/riscv/net/bpf_jit_comp.c1643
1 files changed, 0 insertions, 1643 deletions
diff --git a/arch/riscv/net/bpf_jit_comp.c b/arch/riscv/net/bpf_jit_comp.c
deleted file mode 100644
index 5451ef3845f2..000000000000
--- a/arch/riscv/net/bpf_jit_comp.c
+++ /dev/null
@@ -1,1643 +0,0 @@
-// SPDX-License-Identifier: GPL-2.0
-/* BPF JIT compiler for RV64G
- *
- * Copyright(c) 2019 Björn Töpel <bjorn.topel@gmail.com>
- *
- */
-
-#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,
-};
-
-#define RV_REG_TCC RV_REG_A6
-#define RV_REG_TCC_SAVED RV_REG_S6 /* Store A6 in S6 if program do calls */
-
-static const int regmap[] = {
- [BPF_REG_0] = RV_REG_A5,
- [BPF_REG_1] = RV_REG_A0,
- [BPF_REG_2] = RV_REG_A1,
- [BPF_REG_3] = RV_REG_A2,
- [BPF_REG_4] = RV_REG_A3,
- [BPF_REG_5] = RV_REG_A4,
- [BPF_REG_6] = RV_REG_S1,
- [BPF_REG_7] = RV_REG_S2,
- [BPF_REG_8] = RV_REG_S3,
- [BPF_REG_9] = RV_REG_S4,
- [BPF_REG_FP] = RV_REG_S5,
- [BPF_REG_AX] = RV_REG_T0,
-};
-
-enum {
- RV_CTX_F_SEEN_TAIL_CALL = 0,
- RV_CTX_F_SEEN_CALL = RV_REG_RA,
- RV_CTX_F_SEEN_S1 = RV_REG_S1,
- RV_CTX_F_SEEN_S2 = RV_REG_S2,
- RV_CTX_F_SEEN_S3 = RV_REG_S3,
- RV_CTX_F_SEEN_S4 = RV_REG_S4,
- RV_CTX_F_SEEN_S5 = RV_REG_S5,
- RV_CTX_F_SEEN_S6 = RV_REG_S6,
-};
-
-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 u8 bpf_to_rv_reg(int bpf_reg, struct rv_jit_context *ctx)
-{
- u8 reg = regmap[bpf_reg];
-
- switch (reg) {
- case RV_CTX_F_SEEN_S1:
- case RV_CTX_F_SEEN_S2:
- case RV_CTX_F_SEEN_S3:
- case RV_CTX_F_SEEN_S4:
- case RV_CTX_F_SEEN_S5:
- case RV_CTX_F_SEEN_S6:
- __set_bit(reg, &ctx->flags);
- }
- return reg;
-};
-
-static bool seen_reg(int reg, struct rv_jit_context *ctx)
-{
- switch (reg) {
- case RV_CTX_F_SEEN_CALL:
- case RV_CTX_F_SEEN_S1:
- case RV_CTX_F_SEEN_S2:
- case RV_CTX_F_SEEN_S3:
- case RV_CTX_F_SEEN_S4:
- case RV_CTX_F_SEEN_S5:
- case RV_CTX_F_SEEN_S6:
- return test_bit(reg, &ctx->flags);
- }
- return false;
-}
-
-static void mark_call(struct rv_jit_context *ctx)
-{
- __set_bit(RV_CTX_F_SEEN_CALL, &ctx->flags);
-}
-
-static bool seen_call(struct rv_jit_context *ctx)
-{
- return test_bit(RV_CTX_F_SEEN_CALL, &ctx->flags);
-}
-
-static void mark_tail_call(struct rv_jit_context *ctx)
-{
- __set_bit(RV_CTX_F_SEEN_TAIL_CALL, &ctx->flags);
-}
-
-static bool seen_tail_call(struct rv_jit_context *ctx)
-{
- return test_bit(RV_CTX_F_SEEN_TAIL_CALL, &ctx->flags);
-}
-
-static u8 rv_tail_call_reg(struct rv_jit_context *ctx)
-{
- mark_tail_call(ctx);
-
- if (seen_call(ctx)) {
- __set_bit(RV_CTX_F_SEEN_S6, &ctx->flags);
- return RV_REG_S6;
- }
- return RV_REG_A6;
-}
-
-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_addiw(u8 rd, u8 rs1, u16 imm11_0)
-{
- return rv_i_insn(imm11_0, rs1, 0, rd, 0x1b);
-}
-
-static u32 rv_addi(u8 rd, u8 rs1, u16 imm11_0)
-{
- return rv_i_insn(imm11_0, rs1, 0, rd, 0x13);
-}
-
-static u32 rv_addw(u8 rd, u8 rs1, u8 rs2)
-{
- return rv_r_insn(0, rs2, rs1, 0, rd, 0x3b);
-}
-
-static u32 rv_add(u8 rd, u8 rs1, u8 rs2)
-{
- return rv_r_insn(0, rs2, rs1, 0, rd, 0x33);
-}
-
-static u32 rv_subw(u8 rd, u8 rs1, u8 rs2)
-{
- return rv_r_insn(0x20, rs2, rs1, 0, rd, 0x3b);
-}
-
-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_mulw(u8 rd, u8 rs1, u8 rs2)
-{
- return rv_r_insn(1, rs2, rs1, 0, rd, 0x3b);
-}
-
-static u32 rv_mul(u8 rd, u8 rs1, u8 rs2)
-{
- return rv_r_insn(1, rs2, rs1, 0, rd, 0x33);
-}
-
-static u32 rv_divuw(u8 rd, u8 rs1, u8 rs2)
-{
- return rv_r_insn(1, rs2, rs1, 5, rd, 0x3b);
-}
-
-static u32 rv_divu(u8 rd, u8 rs1, u8 rs2)
-{
- return rv_r_insn(1, rs2, rs1, 5, rd, 0x33);
-}
-
-static u32 rv_remuw(u8 rd, u8 rs1, u8 rs2)
-{
- return rv_r_insn(1, rs2, rs1, 7, rd, 0x3b);
-}
-
-static u32 rv_remu(u8 rd, u8 rs1, u8 rs2)
-{
- return rv_r_insn(1, rs2, rs1, 7, rd, 0x33);
-}
-
-static u32 rv_sllw(u8 rd, u8 rs1, u8 rs2)
-{
- return rv_r_insn(0, rs2, rs1, 1, rd, 0x3b);
-}
-
-static u32 rv_sll(u8 rd, u8 rs1, u8 rs2)
-{
- return rv_r_insn(0, rs2, rs1, 1, rd, 0x33);
-}
-
-static u32 rv_srlw(u8 rd, u8 rs1, u8 rs2)
-{
- return rv_r_insn(0, rs2, rs1, 5, rd, 0x3b);
-}
-
-static u32 rv_srl(u8 rd, u8 rs1, u8 rs2)
-{
- return rv_r_insn(0, rs2, rs1, 5, rd, 0x33);
-}
-
-static u32 rv_sraw(u8 rd, u8 rs1, u8 rs2)
-{
- return rv_r_insn(0x20, rs2, rs1, 5, rd, 0x3b);
-}
-
-static u32 rv_sra(u8 rd, u8 rs1, u8 rs2)
-{
- return rv_r_insn(0x20, rs2, rs1, 5, 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_andi(u8 rd, u8 rs1, u16 imm11_0)
-{
- return rv_i_insn(imm11_0, rs1, 7, rd, 0x13);
-}
-
-static u32 rv_ori(u8 rd, u8 rs1, u16 imm11_0)
-{
- return rv_i_insn(imm11_0, rs1, 6, rd, 0x13);
-}
-
-static u32 rv_xori(u8 rd, u8 rs1, u16 imm11_0)
-{
- return rv_i_insn(imm11_0, rs1, 4, rd, 0x13);
-}
-
-static u32 rv_slliw(u8 rd, u8 rs1, u16 imm11_0)
-{
- return rv_i_insn(imm11_0, rs1, 1, rd, 0x1b);
-}
-
-static u32 rv_srliw(u8 rd, u8 rs1, u16 imm11_0)
-{
- return rv_i_insn(imm11_0, rs1, 5, rd, 0x1b);
-}
-
-static u32 rv_srli(u8 rd, u8 rs1, u16 imm11_0)
-{
- return rv_i_insn(imm11_0, rs1, 5, rd, 0x13);
-}
-
-static u32 rv_sraiw(u8 rd, u8 rs1, u16 imm11_0)
-{
- return rv_i_insn(0x400 | imm11_0, rs1, 5, rd, 0x1b);
-}
-
-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_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_sd(u8 rs1, u16 imm11_0, u8 rs2)
-{
- return rv_s_insn(imm11_0, rs2, rs1, 3, 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_lwu(u8 rd, u16 imm11_0, u8 rs1)
-{
- return rv_i_insn(imm11_0, rs1, 6, rd, 0x03);
-}
-
-static u32 rv_ld(u8 rd, u16 imm11_0, u8 rs1)
-{
- return rv_i_insn(imm11_0, rs1, 3, 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 u32 rv_amoadd_d(u8 rd, u8 rs2, u8 rs1, u8 aq, u8 rl)
-{
- return rv_amo_insn(0, aq, rl, rs2, rs1, 3, rd, 0x2f);
-}
-
-static bool is_12b_int(s64 val)
-{
- return -(1 << 11) <= val && val < (1 << 11);
-}
-
-static bool is_13b_int(s64 val)
-{
- return -(1 << 12) <= val && val < (1 << 12);
-}
-
-static bool is_21b_int(s64 val)
-{
- return -(1L << 20) <= val && val < (1L << 20);
-}
-
-static bool is_32b_int(s64 val)
-{
- return -(1L << 31) <= val && val < (1L << 31);
-}
-
-static int is_12b_check(int off, int insn)
-{
- if (!is_12b_int(off)) {
- pr_err("bpf-jit: insn=%d offset=%d not supported yet!\n",
- insn, (int)off);
- return -1;
- }
- return 0;
-}
-
-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, (int)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, (int)off);
- return -1;
- }
- return 0;
-}
-
-static void emit_imm(u8 rd, s64 val, struct rv_jit_context *ctx)
-{
- /* Note that the immediate from the add is sign-extended,
- * which means that we need to compensate this by adding 2^12,
- * when the 12th bit is set. A simpler way of doing this, and
- * getting rid of the check, is to just add 2**11 before the
- * shift. The "Loading a 32-Bit constant" example from the
- * "Computer Organization and Design, RISC-V edition" book by
- * Patterson/Hennessy highlights this fact.
- *
- * This also means that we need to process LSB to MSB.
- */
- s64 upper = (val + (1 << 11)) >> 12, lower = val & 0xfff;
- int shift;
-
- if (is_32b_int(val)) {
- if (upper)
- emit(rv_lui(rd, upper), ctx);
-
- if (!upper) {
- emit(rv_addi(rd, RV_REG_ZERO, lower), ctx);
- return;
- }
-
- emit(rv_addiw(rd, rd, lower), ctx);
- return;
- }
-
- shift = __ffs(upper);
- upper >>= shift;
- shift += 12;
-
- emit_imm(rd, upper, ctx);
-
- emit(rv_slli(rd, rd, shift), ctx);
- if (lower)
- emit(rv_addi(rd, rd, lower), 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(u8 reg, struct rv_jit_context *ctx)
-{
- int stack_adjust = ctx->stack_size, store_offset = stack_adjust - 8;
-
- if (seen_reg(RV_REG_RA, ctx)) {
- emit(rv_ld(RV_REG_RA, store_offset, RV_REG_SP), ctx);
- store_offset -= 8;
- }
- emit(rv_ld(RV_REG_FP, store_offset, RV_REG_SP), ctx);
- store_offset -= 8;
- if (seen_reg(RV_REG_S1, ctx)) {
- emit(rv_ld(RV_REG_S1, store_offset, RV_REG_SP), ctx);
- store_offset -= 8;
- }
- if (seen_reg(RV_REG_S2, ctx)) {
- emit(rv_ld(RV_REG_S2, store_offset, RV_REG_SP), ctx);
- store_offset -= 8;
- }
- if (seen_reg(RV_REG_S3, ctx)) {
- emit(rv_ld(RV_REG_S3, store_offset, RV_REG_SP), ctx);
- store_offset -= 8;
- }
- if (seen_reg(RV_REG_S4, ctx)) {
- emit(rv_ld(RV_REG_S4, store_offset, RV_REG_SP), ctx);
- store_offset -= 8;
- }
- if (seen_reg(RV_REG_S5, ctx)) {
- emit(rv_ld(RV_REG_S5, store_offset, RV_REG_SP), ctx);
- store_offset -= 8;
- }
- if (seen_reg(RV_REG_S6, ctx)) {
- emit(rv_ld(RV_REG_S6, store_offset, RV_REG_SP), ctx);
- store_offset -= 8;
- }
-
- emit(rv_addi(RV_REG_SP, RV_REG_SP, stack_adjust), ctx);
- /* Set return value. */
- emit(rv_addi(RV_REG_A0, RV_REG_A5, 0), ctx);
- emit(rv_jalr(RV_REG_ZERO, reg, 0), ctx);
-}
-
-static void emit_zext_32(u8 reg, struct rv_jit_context *ctx)
-{
- emit(rv_slli(reg, reg, 32), ctx);
- emit(rv_srli(reg, reg, 32), ctx);
-}
-
-static int emit_bpf_tail_call(int insn, struct rv_jit_context *ctx)
-{
- int tc_ninsn, off, start_insn = ctx->ninsns;
- u8 tcc = rv_tail_call_reg(ctx);
-
- /* a0: &ctx
- * a1: &array
- * a2: index
- *
- * if (index >= array->map.max_entries)
- * goto out;
- */
- tc_ninsn = insn ? ctx->offset[insn] - ctx->offset[insn - 1] :
- ctx->offset[0];
- emit_zext_32(RV_REG_A2, ctx);
-
- off = offsetof(struct bpf_array, map.max_entries);
- if (is_12b_check(off, insn))
- return -1;
- emit(rv_lwu(RV_REG_T1, off, RV_REG_A1), ctx);
- off = (tc_ninsn - (ctx->ninsns - start_insn)) << 2;
- if (is_13b_check(off, insn))
- return -1;
- emit(rv_bgeu(RV_REG_A2, RV_REG_T1, off >> 1), ctx);
-
- /* if (--TCC < 0)
- * goto out;
- */
- emit(rv_addi(RV_REG_T1, tcc, -1), ctx);
- off = (tc_ninsn - (ctx->ninsns - start_insn)) << 2;
- if (is_13b_check(off, insn))
- return -1;
- emit(rv_blt(RV_REG_T1, RV_REG_ZERO, off >> 1), ctx);
-
- /* prog = array->ptrs[index];
- * if (!prog)
- * goto out;
- */
- emit(rv_slli(RV_REG_T2, RV_REG_A2, 3), ctx);
- emit(rv_add(RV_REG_T2, RV_REG_T2, RV_REG_A1), ctx);
- off = offsetof(struct bpf_array, ptrs);
- if (is_12b_check(off, insn))
- return -1;
- emit(rv_ld(RV_REG_T2, off, RV_REG_T2), ctx);
- off = (tc_ninsn - (ctx->ninsns - start_insn)) << 2;
- if (is_13b_check(off, insn))
- return -1;
- emit(rv_beq(RV_REG_T2, RV_REG_ZERO, off >> 1), ctx);
-
- /* goto *(prog->bpf_func + 4); */
- off = offsetof(struct bpf_prog, bpf_func);
- if (is_12b_check(off, insn))
- return -1;
- emit(rv_ld(RV_REG_T3, off, RV_REG_T2), ctx);
- emit(rv_addi(RV_REG_T3, RV_REG_T3, 4), ctx);
- emit(rv_addi(RV_REG_TCC, RV_REG_T1, 0), ctx);
- __build_epilogue(RV_REG_T3, ctx);
- return 0;
-}
-
-static void init_regs(u8 *rd, u8 *rs, const struct bpf_insn *insn,
- struct rv_jit_context *ctx)
-{
- u8 code = insn->code;
-
- switch (code) {
- case BPF_JMP | BPF_JA:
- case BPF_JMP | BPF_CALL:
- case BPF_JMP | BPF_EXIT:
- case BPF_JMP | BPF_TAIL_CALL:
- break;
- default:
- *rd = bpf_to_rv_reg(insn->dst_reg, ctx);
- }
-
- if (code & (BPF_ALU | BPF_X) || code & (BPF_ALU64 | BPF_X) ||
- code & (BPF_JMP | BPF_X) || code & (BPF_JMP32 | BPF_X) ||
- code & BPF_LDX || code & BPF_STX)
- *rs = bpf_to_rv_reg(insn->src_reg, 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 void emit_zext_32_rd_rs(u8 *rd, u8 *rs, struct rv_jit_context *ctx)
-{
- emit(rv_addi(RV_REG_T2, *rd, 0), ctx);
- emit_zext_32(RV_REG_T2, ctx);
- emit(rv_addi(RV_REG_T1, *rs, 0), ctx);
- emit_zext_32(RV_REG_T1, ctx);
- *rd = RV_REG_T2;
- *rs = RV_REG_T1;
-}
-
-static void emit_sext_32_rd_rs(u8 *rd, u8 *rs, struct rv_jit_context *ctx)
-{
- emit(rv_addiw(RV_REG_T2, *rd, 0), ctx);
- emit(rv_addiw(RV_REG_T1, *rs, 0), ctx);
- *rd = RV_REG_T2;
- *rs = RV_REG_T1;
-}
-
-static void emit_zext_32_rd_t1(u8 *rd, struct rv_jit_context *ctx)
-{
- emit(rv_addi(RV_REG_T2, *rd, 0), ctx);
- emit_zext_32(RV_REG_T2, ctx);
- emit_zext_32(RV_REG_T1, ctx);
- *rd = RV_REG_T2;
-}
-
-static void emit_sext_32_rd(u8 *rd, struct rv_jit_context *ctx)
-{
- emit(rv_addiw(RV_REG_T2, *rd, 0), ctx);
- *rd = RV_REG_T2;
-}
-
-static int emit_insn(const struct bpf_insn *insn, struct rv_jit_context *ctx,
- bool extra_pass)
-{
- bool is64 = BPF_CLASS(insn->code) == BPF_ALU64 ||
- BPF_CLASS(insn->code) == BPF_JMP;
- struct bpf_prog_aux *aux = ctx->prog->aux;
- int rvoff, i = insn - ctx->prog->insnsi;
- u8 rd = -1, rs = -1, code = insn->code;
- s16 off = insn->off;
- s32 imm = insn->imm;
-
- init_regs(&rd, &rs, insn, ctx);
-
- switch (code) {
- /* dst = src */
- case BPF_ALU | BPF_MOV | BPF_X:
- case BPF_ALU64 | BPF_MOV | BPF_X:
- if (imm == 1) {
- /* Special mov32 for zext */
- emit_zext_32(rd, ctx);
- break;
- }
- emit(is64 ? rv_addi(rd, rs, 0) : rv_addiw(rd, rs, 0), ctx);
- if (!is64 && !aux->verifier_zext)
- emit_zext_32(rd, ctx);
- break;
-
- /* dst = dst OP src */
- case BPF_ALU | BPF_ADD | BPF_X:
- case BPF_ALU64 | BPF_ADD | BPF_X:
- emit(is64 ? rv_add(rd, rd, rs) : rv_addw(rd, rd, rs), ctx);
- if (!is64 && !aux->verifier_zext)
- emit_zext_32(rd, ctx);
- break;
- case BPF_ALU | BPF_SUB | BPF_X:
- case BPF_ALU64 | BPF_SUB | BPF_X:
- emit(is64 ? rv_sub(rd, rd, rs) : rv_subw(rd, rd, rs), ctx);
- if (!is64 && !aux->verifier_zext)
- emit_zext_32(rd, ctx);
- break;
- case BPF_ALU | BPF_AND | BPF_X:
- case BPF_ALU64 | BPF_AND | BPF_X:
- emit(rv_and(rd, rd, rs), ctx);
- if (!is64 && !aux->verifier_zext)
- emit_zext_32(rd, ctx);
- break;
- case BPF_ALU | BPF_OR | BPF_X:
- case BPF_ALU64 | BPF_OR | BPF_X:
- emit(rv_or(rd, rd, rs), ctx);
- if (!is64 && !aux->verifier_zext)
- emit_zext_32(rd, ctx);
- break;
- case BPF_ALU | BPF_XOR | BPF_X:
- case BPF_ALU64 | BPF_XOR | BPF_X:
- emit(rv_xor(rd, rd, rs), ctx);
- if (!is64 && !aux->verifier_zext)
- emit_zext_32(rd, ctx);
- break;
- case BPF_ALU | BPF_MUL | BPF_X:
- case BPF_ALU64 | BPF_MUL | BPF_X:
- emit(is64 ? rv_mul(rd, rd, rs) : rv_mulw(rd, rd, rs), ctx);
- if (!is64 && !aux->verifier_zext)
- emit_zext_32(rd, ctx);
- break;
- case BPF_ALU | BPF_DIV | BPF_X:
- case BPF_ALU64 | BPF_DIV | BPF_X:
- emit(is64 ? rv_divu(rd, rd, rs) : rv_divuw(rd, rd, rs), ctx);
- if (!is64 && !aux->verifier_zext)
- emit_zext_32(rd, ctx);
- break;
- case BPF_ALU | BPF_MOD | BPF_X:
- case BPF_ALU64 | BPF_MOD | BPF_X:
- emit(is64 ? rv_remu(rd, rd, rs) : rv_remuw(rd, rd, rs), ctx);
- if (!is64 && !aux->verifier_zext)
- emit_zext_32(rd, ctx);
- break;
- case BPF_ALU | BPF_LSH | BPF_X:
- case BPF_ALU64 | BPF_LSH | BPF_X:
- emit(is64 ? rv_sll(rd, rd, rs) : rv_sllw(rd, rd, rs), ctx);
- if (!is64)
- emit_zext_32(rd, ctx);
- break;
- case BPF_ALU | BPF_RSH | BPF_X:
- case BPF_ALU64 | BPF_RSH | BPF_X:
- emit(is64 ? rv_srl(rd, rd, rs) : rv_srlw(rd, rd, rs), ctx);
- if (!is64 && !aux->verifier_zext)
- emit_zext_32(rd, ctx);
- break;
- case BPF_ALU | BPF_ARSH | BPF_X:
- case BPF_ALU64 | BPF_ARSH | BPF_X:
- emit(is64 ? rv_sra(rd, rd, rs) : rv_sraw(rd, rd, rs), ctx);
- if (!is64 && !aux->verifier_zext)
- emit_zext_32(rd, ctx);
- break;
-
- /* dst = -dst */
- case BPF_ALU | BPF_NEG:
- case BPF_ALU64 | BPF_NEG:
- emit(is64 ? rv_sub(rd, RV_REG_ZERO, rd) :
- rv_subw(rd, RV_REG_ZERO, rd), ctx);
- if (!is64 && !aux->verifier_zext)
- emit_zext_32(rd, ctx);
- break;
-
- /* dst = BSWAP##imm(dst) */
- case BPF_ALU | BPF_END | BPF_FROM_LE:
- {
- int shift = 64 - imm;
-
- emit(rv_slli(rd, rd, shift), ctx);
- emit(rv_srli(rd, rd, shift), ctx);
- break;
- }
- case BPF_ALU | BPF_END | BPF_FROM_BE:
- emit(rv_addi(RV_REG_T2, RV_REG_ZERO, 0), ctx);
-
- emit(rv_andi(RV_REG_T1, rd, 0xff), ctx);
- emit(rv_add(RV_REG_T2, RV_REG_T2, RV_REG_T1), ctx);
- emit(rv_slli(RV_REG_T2, RV_REG_T2, 8), ctx);
- emit(rv_srli(rd, rd, 8), ctx);
- if (imm == 16)
- goto out_be;
-
- emit(rv_andi(RV_REG_T1, rd, 0xff), ctx);
- emit(rv_add(RV_REG_T2, RV_REG_T2, RV_REG_T1), ctx);
- emit(rv_slli(RV_REG_T2, RV_REG_T2, 8), ctx);
- emit(rv_srli(rd, rd, 8), ctx);
-
- emit(rv_andi(RV_REG_T1, rd, 0xff), ctx);
- emit(rv_add(RV_REG_T2, RV_REG_T2, RV_REG_T1), ctx);
- emit(rv_slli(RV_REG_T2, RV_REG_T2, 8), ctx);
- emit(rv_srli(rd, rd, 8), ctx);
- if (imm == 32)
- goto out_be;
-
- emit(rv_andi(RV_REG_T1, rd, 0xff), ctx);
- emit(rv_add(RV_REG_T2, RV_REG_T2, RV_REG_T1), ctx);
- emit(rv_slli(RV_REG_T2, RV_REG_T2, 8), ctx);
- emit(rv_srli(rd, rd, 8), ctx);
-
- emit(rv_andi(RV_REG_T1, rd, 0xff), ctx);
- emit(rv_add(RV_REG_T2, RV_REG_T2, RV_REG_T1), ctx);
- emit(rv_slli(RV_REG_T2, RV_REG_T2, 8), ctx);
- emit(rv_srli(rd, rd, 8), ctx);
-
- emit(rv_andi(RV_REG_T1, rd, 0xff), ctx);
- emit(rv_add(RV_REG_T2, RV_REG_T2, RV_REG_T1), ctx);
- emit(rv_slli(RV_REG_T2, RV_REG_T2, 8), ctx);
- emit(rv_srli(rd, rd, 8), ctx);
-
- emit(rv_andi(RV_REG_T1, rd, 0xff), ctx);
- emit(rv_add(RV_REG_T2, RV_REG_T2, RV_REG_T1), ctx);
- emit(rv_slli(RV_REG_T2, RV_REG_T2, 8), ctx);
- emit(rv_srli(rd, rd, 8), ctx);
-out_be:
- emit(rv_andi(RV_REG_T1, rd, 0xff), ctx);
- emit(rv_add(RV_REG_T2, RV_REG_T2, RV_REG_T1), ctx);
-
- emit(rv_addi(rd, RV_REG_T2, 0), ctx);
- break;
-
- /* dst = imm */
- case BPF_ALU | BPF_MOV | BPF_K:
- case BPF_ALU64 | BPF_MOV | BPF_K:
- emit_imm(rd, imm, ctx);
- if (!is64 && !aux->verifier_zext)
- emit_zext_32(rd, ctx);
- break;
-
- /* dst = dst OP imm */
- case BPF_ALU | BPF_ADD | BPF_K:
- case BPF_ALU64 | BPF_ADD | BPF_K:
- if (is_12b_int(imm)) {
- emit(is64 ? rv_addi(rd, rd, imm) :
- rv_addiw(rd, rd, imm), ctx);
- } else {
- emit_imm(RV_REG_T1, imm, ctx);
- emit(is64 ? rv_add(rd, rd, RV_REG_T1) :
- rv_addw(rd, rd, RV_REG_T1), ctx);
- }
- if (!is64 && !aux->verifier_zext)
- emit_zext_32(rd, ctx);
- break;
- case BPF_ALU | BPF_SUB | BPF_K:
- case BPF_ALU64 | BPF_SUB | BPF_K:
- if (is_12b_int(-imm)) {
- emit(is64 ? rv_addi(rd, rd, -imm) :
- rv_addiw(rd, rd, -imm), ctx);
- } else {
- emit_imm(RV_REG_T1, imm, ctx);
- emit(is64 ? rv_sub(rd, rd, RV_REG_T1) :
- rv_subw(rd, rd, RV_REG_T1), ctx);
- }
- if (!is64 && !aux->verifier_zext)
- emit_zext_32(rd, ctx);
- break;
- case BPF_ALU | BPF_AND | BPF_K:
- case BPF_ALU64 | BPF_AND | BPF_K:
- if (is_12b_int(imm)) {
- emit(rv_andi(rd, rd, imm), ctx);
- } else {
- emit_imm(RV_REG_T1, imm, ctx);
- emit(rv_and(rd, rd, RV_REG_T1), ctx);
- }
- if (!is64 && !aux->verifier_zext)
- emit_zext_32(rd, ctx);
- break;
- case BPF_ALU | BPF_OR | BPF_K:
- case BPF_ALU64 | BPF_OR | BPF_K:
- if (is_12b_int(imm)) {
- emit(rv_ori(rd, rd, imm), ctx);
- } else {
- emit_imm(RV_REG_T1, imm, ctx);
- emit(rv_or(rd, rd, RV_REG_T1), ctx);
- }
- if (!is64 && !aux->verifier_zext)
- emit_zext_32(rd, ctx);
- break;
- case BPF_ALU | BPF_XOR | BPF_K:
- case BPF_ALU64 | BPF_XOR | BPF_K:
- if (is_12b_int(imm)) {
- emit(rv_xori(rd, rd, imm), ctx);
- } else {
- emit_imm(RV_REG_T1, imm, ctx);
- emit(rv_xor(rd, rd, RV_REG_T1), ctx);
- }
- if (!is64 && !aux->verifier_zext)
- emit_zext_32(rd, ctx);
- break;
- case BPF_ALU | BPF_MUL | BPF_K:
- case BPF_ALU64 | BPF_MUL | BPF_K:
- emit_imm(RV_REG_T1, imm, ctx);
- emit(is64 ? rv_mul(rd, rd, RV_REG_T1) :
- rv_mulw(rd, rd, RV_REG_T1), ctx);
- if (!is64 && !aux->verifier_zext)
- emit_zext_32(rd, ctx);
- break;
- case BPF_ALU | BPF_DIV | BPF_K:
- case BPF_ALU64 | BPF_DIV | BPF_K:
- emit_imm(RV_REG_T1, imm, ctx);
- emit(is64 ? rv_divu(rd, rd, RV_REG_T1) :
- rv_divuw(rd, rd, RV_REG_T1), ctx);
- if (!is64 && !aux->verifier_zext)
- emit_zext_32(rd, ctx);
- break;
- case BPF_ALU | BPF_MOD | BPF_K:
- case BPF_ALU64 | BPF_MOD | BPF_K:
- emit_imm(RV_REG_T1, imm, ctx);
- emit(is64 ? rv_remu(rd, rd, RV_REG_T1) :
- rv_remuw(rd, rd, RV_REG_T1), ctx);
- if (!is64 && !aux->verifier_zext)
- emit_zext_32(rd, ctx);
- break;
- case BPF_ALU | BPF_LSH | BPF_K:
- case BPF_ALU64 | BPF_LSH | BPF_K:
- emit(is64 ? rv_slli(rd, rd, imm) : rv_slliw(rd, rd, imm), ctx);
- if (!is64)
- emit_zext_32(rd, ctx);
- break;
- case BPF_ALU | BPF_RSH | BPF_K:
- case BPF_ALU64 | BPF_RSH | BPF_K:
- emit(is64 ? rv_srli(rd, rd, imm) : rv_srliw(rd, rd, imm), ctx);
- if (!is64)
- emit_zext_32(rd, ctx);
- break;
- case BPF_ALU | BPF_ARSH | BPF_K:
- case BPF_ALU64 | BPF_ARSH | BPF_K:
- emit(is64 ? rv_srai(rd, rd, imm) : rv_sraiw(rd, rd, imm), ctx);
- if (!is64)
- emit_zext_32(rd, ctx);
- break;
-
- /* JUMP off */
- 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;
-
- /* IF (dst COND src) JUMP off */
- case BPF_JMP | BPF_JEQ | BPF_X:
- case BPF_JMP32 | BPF_JEQ | BPF_X:
- if (rv_offset_check(&rvoff, off, i, ctx))
- return -1;
- if (!is64)
- emit_zext_32_rd_rs(&rd, &rs, ctx);
- emit(rv_beq(rd, rs, rvoff >> 1), ctx);
- break;
- case BPF_JMP | BPF_JGT | BPF_X:
- case BPF_JMP32 | BPF_JGT | BPF_X:
- if (rv_offset_check(&rvoff, off, i, ctx))
- return -1;
- if (!is64)
- emit_zext_32_rd_rs(&rd, &rs, ctx);
- emit(rv_bltu(rs, rd, rvoff >> 1), ctx);
- break;
- case BPF_JMP | BPF_JLT | BPF_X:
- case BPF_JMP32 | BPF_JLT | BPF_X:
- if (rv_offset_check(&rvoff, off, i, ctx))
- return -1;
- if (!is64)
- emit_zext_32_rd_rs(&rd, &rs, ctx);
- emit(rv_bltu(rd, rs, rvoff >> 1), ctx);
- break;
- case BPF_JMP | BPF_JGE | BPF_X:
- case BPF_JMP32 | BPF_JGE | BPF_X:
- if (rv_offset_check(&rvoff, off, i, ctx))
- return -1;
- if (!is64)
- emit_zext_32_rd_rs(&rd, &rs, ctx);
- emit(rv_bgeu(rd, rs, rvoff >> 1), ctx);
- break;
- case BPF_JMP | BPF_JLE | BPF_X:
- case BPF_JMP32 | BPF_JLE | BPF_X:
- if (rv_offset_check(&rvoff, off, i, ctx))
- return -1;
- if (!is64)
- emit_zext_32_rd_rs(&rd, &rs, ctx);
- emit(rv_bgeu(rs, rd, rvoff >> 1), ctx);
- break;
- case BPF_JMP | BPF_JNE | BPF_X:
- case BPF_JMP32 | BPF_JNE | BPF_X:
- if (rv_offset_check(&rvoff, off, i, ctx))
- return -1;
- if (!is64)
- emit_zext_32_rd_rs(&rd, &rs, ctx);
- emit(rv_bne(rd, rs, rvoff >> 1), ctx);
- break;
- case BPF_JMP | BPF_JSGT | BPF_X:
- case BPF_JMP32 | BPF_JSGT | BPF_X:
- if (rv_offset_check(&rvoff, off, i, ctx))
- return -1;
- if (!is64)
- emit_sext_32_rd_rs(&rd, &rs, ctx);
- emit(rv_blt(rs, rd, rvoff >> 1), ctx);
- break;
- case BPF_JMP | BPF_JSLT | BPF_X:
- case BPF_JMP32 | BPF_JSLT | BPF_X:
- if (rv_offset_check(&rvoff, off, i, ctx))
- return -1;
- if (!is64)
- emit_sext_32_rd_rs(&rd, &rs, ctx);
- emit(rv_blt(rd, rs, rvoff >> 1), ctx);
- break;
- case BPF_JMP | BPF_JSGE | BPF_X:
- case BPF_JMP32 | BPF_JSGE | BPF_X:
- if (rv_offset_check(&rvoff, off, i, ctx))
- return -1;
- if (!is64)
- emit_sext_32_rd_rs(&rd, &rs, ctx);
- emit(rv_bge(rd, rs, rvoff >> 1), ctx);
- break;
- case BPF_JMP | BPF_JSLE | BPF_X:
- case BPF_JMP32 | BPF_JSLE | BPF_X:
- if (rv_offset_check(&rvoff, off, i, ctx))
- return -1;
- if (!is64)
- emit_sext_32_rd_rs(&rd, &rs, ctx);
- emit(rv_bge(rs, rd, rvoff >> 1), ctx);
- break;
- case BPF_JMP | BPF_JSET | BPF_X:
- case BPF_JMP32 | BPF_JSET | BPF_X:
- if (rv_offset_check(&rvoff, off, i, ctx))
- return -1;
- if (!is64)
- emit_zext_32_rd_rs(&rd, &rs, ctx);
- emit(rv_and(RV_REG_T1, rd, rs), ctx);
- emit(rv_bne(RV_REG_T1, RV_REG_ZERO, rvoff >> 1), ctx);
- break;
-
- /* IF (dst COND imm) JUMP off */
- case BPF_JMP | BPF_JEQ | BPF_K:
- case BPF_JMP32 | BPF_JEQ | BPF_K:
- if (rv_offset_check(&rvoff, off, i, ctx))
- return -1;
- emit_imm(RV_REG_T1, imm, ctx);
- if (!is64)
- emit_zext_32_rd_t1(&rd, ctx);
- emit(rv_beq(rd, RV_REG_T1, rvoff >> 1), ctx);
- break;
- case BPF_JMP | BPF_JGT | BPF_K:
- case BPF_JMP32 | BPF_JGT | BPF_K:
- if (rv_offset_check(&rvoff, off, i, ctx))
- return -1;
- emit_imm(RV_REG_T1, imm, ctx);
- if (!is64)
- emit_zext_32_rd_t1(&rd, ctx);
- emit(rv_bltu(RV_REG_T1, rd, rvoff >> 1), ctx);
- break;
- case BPF_JMP | BPF_JLT | BPF_K:
- case BPF_JMP32 | BPF_JLT | BPF_K:
- if (rv_offset_check(&rvoff, off, i, ctx))
- return -1;
- emit_imm(RV_REG_T1, imm, ctx);
- if (!is64)
- emit_zext_32_rd_t1(&rd, ctx);
- emit(rv_bltu(rd, RV_REG_T1, rvoff >> 1), ctx);
- break;
- case BPF_JMP | BPF_JGE | BPF_K:
- case BPF_JMP32 | BPF_JGE | BPF_K:
- if (rv_offset_check(&rvoff, off, i, ctx))
- return -1;
- emit_imm(RV_REG_T1, imm, ctx);
- if (!is64)
- emit_zext_32_rd_t1(&rd, ctx);
- emit(rv_bgeu(rd, RV_REG_T1, rvoff >> 1), ctx);
- break;
- case BPF_JMP | BPF_JLE | BPF_K:
- case BPF_JMP32 | BPF_JLE | BPF_K:
- if (rv_offset_check(&rvoff, off, i, ctx))
- return -1;
- emit_imm(RV_REG_T1, imm, ctx);
- if (!is64)
- emit_zext_32_rd_t1(&rd, ctx);
- emit(rv_bgeu(RV_REG_T1, rd, rvoff >> 1), ctx);
- break;
- case BPF_JMP | BPF_JNE | BPF_K:
- case BPF_JMP32 | BPF_JNE | BPF_K:
- if (rv_offset_check(&rvoff, off, i, ctx))
- return -1;
- emit_imm(RV_REG_T1, imm, ctx);
- if (!is64)
- emit_zext_32_rd_t1(&rd, ctx);
- emit(rv_bne(rd, RV_REG_T1, rvoff >> 1), ctx);
- break;
- case BPF_JMP | BPF_JSGT | BPF_K:
- case BPF_JMP32 | BPF_JSGT | BPF_K:
- if (rv_offset_check(&rvoff, off, i, ctx))
- return -1;
- emit_imm(RV_REG_T1, imm, ctx);
- if (!is64)
- emit_sext_32_rd(&rd, ctx);
- emit(rv_blt(RV_REG_T1, rd, rvoff >> 1), ctx);
- break;
- case BPF_JMP | BPF_JSLT | BPF_K:
- case BPF_JMP32 | BPF_JSLT | BPF_K:
- if (rv_offset_check(&rvoff, off, i, ctx))
- return -1;
- emit_imm(RV_REG_T1, imm, ctx);
- if (!is64)
- emit_sext_32_rd(&rd, ctx);
- emit(rv_blt(rd, RV_REG_T1, rvoff >> 1), ctx);
- break;
- case BPF_JMP | BPF_JSGE | BPF_K:
- case BPF_JMP32 | BPF_JSGE | BPF_K:
- if (rv_offset_check(&rvoff, off, i, ctx))
- return -1;
- emit_imm(RV_REG_T1, imm, ctx);
- if (!is64)
- emit_sext_32_rd(&rd, ctx);
- emit(rv_bge(rd, RV_REG_T1, rvoff >> 1), ctx);
- break;
- case BPF_JMP | BPF_JSLE | BPF_K:
- case BPF_JMP32 | BPF_JSLE | BPF_K:
- if (rv_offset_check(&rvoff, off, i, ctx))
- return -1;
- emit_imm(RV_REG_T1, imm, ctx);
- if (!is64)
- emit_sext_32_rd(&rd, ctx);
- emit(rv_bge(RV_REG_T1, rd, rvoff >> 1), ctx);
- break;
- case BPF_JMP | BPF_JSET | BPF_K:
- case BPF_JMP32 | BPF_JSET | BPF_K:
- if (rv_offset_check(&rvoff, off, i, ctx))
- return -1;
- emit_imm(RV_REG_T1, imm, ctx);
- if (!is64)
- emit_zext_32_rd_t1(&rd, ctx);
- emit(rv_and(RV_REG_T1, rd, RV_REG_T1), ctx);
- emit(rv_bne(RV_REG_T1, RV_REG_ZERO, rvoff >> 1), ctx);
- break;
-
- /* function call */
- case BPF_JMP | BPF_CALL:
- {
- bool fixed;
- int i, ret;
- u64 addr;
-
- mark_call(ctx);
- ret = bpf_jit_get_func_addr(ctx->prog, insn, extra_pass, &addr,
- &fixed);
- if (ret < 0)
- return ret;
- if (fixed) {
- emit_imm(RV_REG_T1, addr, ctx);
- } else {
- i = ctx->ninsns;
- emit_imm(RV_REG_T1, addr, ctx);
- for (i = ctx->ninsns - i; i < 8; i++) {
- /* nop */
- emit(rv_addi(RV_REG_ZERO, RV_REG_ZERO, 0),
- ctx);
- }
- }
- emit(rv_jalr(RV_REG_RA, RV_REG_T1, 0), ctx);
- rd = bpf_to_rv_reg(BPF_REG_0, ctx);
- emit(rv_addi(rd, RV_REG_A0, 0), ctx);
- break;
- }
- /* tail call */
- case BPF_JMP | BPF_TAIL_CALL:
- if (emit_bpf_tail_call(i, ctx))
- return -1;
- break;
-
- /* function return */
- 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;
-
- /* dst = imm64 */
- case BPF_LD | BPF_IMM | BPF_DW:
- {
- struct bpf_insn insn1 = insn[1];
- u64 imm64;
-
- imm64 = (u64)insn1.imm << 32 | (u32)imm;
- emit_imm(rd, imm64, ctx);
- return 1;
- }
-
- /* LDX: dst = *(size *)(src + off) */
- case BPF_LDX | BPF_MEM | BPF_B:
- if (is_12b_int(off)) {
- emit(rv_lbu(rd, off, rs), ctx);
- break;
- }
-
- emit_imm(RV_REG_T1, off, ctx);
- emit(rv_add(RV_REG_T1, RV_REG_T1, rs), ctx);
- emit(rv_lbu(rd, 0, RV_REG_T1), ctx);
- if (insn_is_zext(&insn[1]))
- return 1;
- break;
- case BPF_LDX | BPF_MEM | BPF_H:
- if (is_12b_int(off)) {
- emit(rv_lhu(rd, off, rs), ctx);
- break;
- }
-
- emit_imm(RV_REG_T1, off, ctx);
- emit(rv_add(RV_REG_T1, RV_REG_T1, rs), ctx);
- emit(rv_lhu(rd, 0, RV_REG_T1), ctx);
- if (insn_is_zext(&insn[1]))
- return 1;
- break;
- case BPF_LDX | BPF_MEM | BPF_W:
- if (is_12b_int(off)) {
- emit(rv_lwu(rd, off, rs), ctx);
- break;
- }
-
- emit_imm(RV_REG_T1, off, ctx);
- emit(rv_add(RV_REG_T1, RV_REG_T1, rs), ctx);
- emit(rv_lwu(rd, 0, RV_REG_T1), ctx);
- if (insn_is_zext(&insn[1]))
- return 1;
- break;
- case BPF_LDX | BPF_MEM | BPF_DW:
- if (is_12b_int(off)) {
- emit(rv_ld(rd, off, rs), ctx);
- break;
- }
-
- emit_imm(RV_REG_T1, off, ctx);
- emit(rv_add(RV_REG_T1, RV_REG_T1, rs), ctx);
- emit(rv_ld(rd, 0, RV_REG_T1), ctx);
- break;
-
- /* ST: *(size *)(dst + off) = imm */
- case BPF_ST | BPF_MEM | BPF_B:
- emit_imm(RV_REG_T1, imm, ctx);
- if (is_12b_int(off)) {
- emit(rv_sb(rd, off, RV_REG_T1), ctx);
- break;
- }
-
- emit_imm(RV_REG_T2, off, ctx);
- emit(rv_add(RV_REG_T2, RV_REG_T2, rd), ctx);
- emit(rv_sb(RV_REG_T2, 0, RV_REG_T1), ctx);
- break;
-
- case BPF_ST | BPF_MEM | BPF_H:
- emit_imm(RV_REG_T1, imm, ctx);
- if (is_12b_int(off)) {
- emit(rv_sh(rd, off, RV_REG_T1), ctx);
- break;
- }
-
- emit_imm(RV_REG_T2, off, ctx);
- emit(rv_add(RV_REG_T2, RV_REG_T2, rd), ctx);
- emit(rv_sh(RV_REG_T2, 0, RV_REG_T1), ctx);
- break;
- case BPF_ST | BPF_MEM | BPF_W:
- emit_imm(RV_REG_T1, imm, ctx);
- if (is_12b_int(off)) {
- emit(rv_sw(rd, off, RV_REG_T1), ctx);
- break;
- }
-
- emit_imm(RV_REG_T2, off, ctx);
- emit(rv_add(RV_REG_T2, RV_REG_T2, rd), ctx);
- emit(rv_sw(RV_REG_T2, 0, RV_REG_T1), ctx);
- break;
- case BPF_ST | BPF_MEM | BPF_DW:
- emit_imm(RV_REG_T1, imm, ctx);
- if (is_12b_int(off)) {
- emit(rv_sd(rd, off, RV_REG_T1), ctx);
- break;
- }
-
- emit_imm(RV_REG_T2, off, ctx);
- emit(rv_add(RV_REG_T2, RV_REG_T2, rd), ctx);
- emit(rv_sd(RV_REG_T2, 0, RV_REG_T1), ctx);
- break;
-
- /* STX: *(size *)(dst + off) = src */
- case BPF_STX | BPF_MEM | BPF_B:
- if (is_12b_int(off)) {
- emit(rv_sb(rd, off, rs), ctx);
- break;
- }
-
- emit_imm(RV_REG_T1, off, ctx);
- emit(rv_add(RV_REG_T1, RV_REG_T1, rd), ctx);
- emit(rv_sb(RV_REG_T1, 0, rs), ctx);
- break;
- case BPF_STX | BPF_MEM | BPF_H:
- if (is_12b_int(off)) {
- emit(rv_sh(rd, off, rs), ctx);
- break;
- }
-
- emit_imm(RV_REG_T1, off, ctx);
- emit(rv_add(RV_REG_T1, RV_REG_T1, rd), ctx);
- emit(rv_sh(RV_REG_T1, 0, rs), ctx);
- break;
- case BPF_STX | BPF_MEM | BPF_W:
- if (is_12b_int(off)) {
- emit(rv_sw(rd, off, rs), ctx);
- break;
- }
-
- emit_imm(RV_REG_T1, off, ctx);
- emit(rv_add(RV_REG_T1, RV_REG_T1, rd), ctx);
- emit(rv_sw(RV_REG_T1, 0, rs), ctx);
- break;
- case BPF_STX | BPF_MEM | BPF_DW:
- if (is_12b_int(off)) {
- emit(rv_sd(rd, off, rs), ctx);
- break;
- }
-
- emit_imm(RV_REG_T1, off, ctx);
- emit(rv_add(RV_REG_T1, RV_REG_T1, rd), ctx);
- emit(rv_sd(RV_REG_T1, 0, rs), ctx);
- break;
- /* STX XADD: lock *(u32 *)(dst + off) += src */
- case BPF_STX | BPF_XADD | BPF_W:
- /* STX XADD: lock *(u64 *)(dst + off) += src */
- case BPF_STX | BPF_XADD | BPF_DW:
- if (off) {
- if (is_12b_int(off)) {
- emit(rv_addi(RV_REG_T1, rd, off), ctx);
- } else {
- emit_imm(RV_REG_T1, off, ctx);
- emit(rv_add(RV_REG_T1, RV_REG_T1, rd), ctx);
- }
-
- rd = RV_REG_T1;
- }
-
- emit(BPF_SIZE(code) == BPF_W ?
- rv_amoadd_w(RV_REG_ZERO, rs, rd, 0, 0) :
- rv_amoadd_d(RV_REG_ZERO, rs, rd, 0, 0), ctx);
- break;
- 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 = 0, store_offset, bpf_stack_adjust;
-
- if (seen_reg(RV_REG_RA, ctx))
- stack_adjust += 8;
- stack_adjust += 8; /* RV_REG_FP */
- if (seen_reg(RV_REG_S1, ctx))
- stack_adjust += 8;
- if (seen_reg(RV_REG_S2, ctx))
- stack_adjust += 8;
- if (seen_reg(RV_REG_S3, ctx))
- stack_adjust += 8;
- if (seen_reg(RV_REG_S4, ctx))
- stack_adjust += 8;
- if (seen_reg(RV_REG_S5, ctx))
- stack_adjust += 8;
- if (seen_reg(RV_REG_S6, ctx))
- stack_adjust += 8;
-
- 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;
-
- /* First instruction is always setting the tail-call-counter
- * (TCC) register. This instruction is skipped for tail calls.
- */
- emit(rv_addi(RV_REG_TCC, RV_REG_ZERO, MAX_TAIL_CALL_CNT), ctx);
-
- emit(rv_addi(RV_REG_SP, RV_REG_SP, -stack_adjust), ctx);
-
- if (seen_reg(RV_REG_RA, ctx)) {
- emit(rv_sd(RV_REG_SP, store_offset, RV_REG_RA), ctx);
- store_offset -= 8;
- }
- emit(rv_sd(RV_REG_SP, store_offset, RV_REG_FP), ctx);
- store_offset -= 8;
- if (seen_reg(RV_REG_S1, ctx)) {
- emit(rv_sd(RV_REG_SP, store_offset, RV_REG_S1), ctx);
- store_offset -= 8;
- }
- if (seen_reg(RV_REG_S2, ctx)) {
- emit(rv_sd(RV_REG_SP, store_offset, RV_REG_S2), ctx);
- store_offset -= 8;
- }
- if (seen_reg(RV_REG_S3, ctx)) {
- emit(rv_sd(RV_REG_SP, store_offset, RV_REG_S3), ctx);
- store_offset -= 8;
- }
- if (seen_reg(RV_REG_S4, ctx)) {
- emit(rv_sd(RV_REG_SP, store_offset, RV_REG_S4), ctx);
- store_offset -= 8;
- }
- if (seen_reg(RV_REG_S5, ctx)) {
- emit(rv_sd(RV_REG_SP, store_offset, RV_REG_S5), ctx);
- store_offset -= 8;
- }
- if (seen_reg(RV_REG_S6, ctx)) {
- emit(rv_sd(RV_REG_SP, store_offset, RV_REG_S6), ctx);
- store_offset -= 8;
- }
-
- emit(rv_addi(RV_REG_FP, RV_REG_SP, stack_adjust), ctx);
-
- if (bpf_stack_adjust)
- emit(rv_addi(RV_REG_S5, RV_REG_SP, bpf_stack_adjust), ctx);
-
- /* Program contains calls and tail calls, so RV_REG_TCC need
- * to be saved across calls.
- */
- if (seen_tail_call(ctx) && seen_call(ctx))
- emit(rv_addi(RV_REG_TCC_SAVED, RV_REG_TCC, 0), ctx);
-
- ctx->stack_size = stack_adjust;
-}
-
-static void build_epilogue(struct rv_jit_context *ctx)
-{
- __build_epilogue(RV_REG_RA, ctx);
-}
-
-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);
-}
-
-bool bpf_jit_needs_zext(void)
-{
- return true;
-}
-
-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;
-}
generated by cgit (git 2.34.1) at 2025-07-29 03:40:19 +0000