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-rw-r--r--arch/riscv/Kconfig2
-rw-r--r--arch/riscv/net/bpf_jit_comp64.c49
2 files changed, 33 insertions, 18 deletions
diff --git a/arch/riscv/Kconfig b/arch/riscv/Kconfig
index a197258595ef..62f7bfeb709e 100644
--- a/arch/riscv/Kconfig
+++ b/arch/riscv/Kconfig
@@ -55,7 +55,7 @@ config RISCV
select ARCH_HAS_PTE_SPECIAL
select ARCH_HAS_MMIOWB
select ARCH_HAS_DEBUG_VIRTUAL
- select HAVE_EBPF_JIT
+ select HAVE_EBPF_JIT if MMU
select EDAC_SUPPORT
select ARCH_HAS_GIGANTIC_PAGE
select ARCH_HAS_SET_DIRECT_MAP
diff --git a/arch/riscv/net/bpf_jit_comp64.c b/arch/riscv/net/bpf_jit_comp64.c
index cc1985d8750a..d208a9fd6c52 100644
--- a/arch/riscv/net/bpf_jit_comp64.c
+++ b/arch/riscv/net/bpf_jit_comp64.c
@@ -110,6 +110,16 @@ static bool is_32b_int(s64 val)
return -(1L << 31) <= val && val < (1L << 31);
}
+static bool in_auipc_jalr_range(s64 val)
+{
+ /*
+ * auipc+jalr can reach any signed PC-relative offset in the range
+ * [-2^31 - 2^11, 2^31 - 2^11).
+ */
+ return (-(1L << 31) - (1L << 11)) <= val &&
+ val < ((1L << 31) - (1L << 11));
+}
+
static void emit_imm(u8 rd, s64 val, struct rv_jit_context *ctx)
{
/* Note that the immediate from the add is sign-extended,
@@ -380,20 +390,24 @@ static void emit_sext_32_rd(u8 *rd, struct rv_jit_context *ctx)
*rd = RV_REG_T2;
}
-static void emit_jump_and_link(u8 rd, s64 rvoff, bool force_jalr,
- struct rv_jit_context *ctx)
+static int emit_jump_and_link(u8 rd, s64 rvoff, bool force_jalr,
+ struct rv_jit_context *ctx)
{
s64 upper, lower;
if (rvoff && is_21b_int(rvoff) && !force_jalr) {
emit(rv_jal(rd, rvoff >> 1), ctx);
- return;
+ return 0;
+ } else if (in_auipc_jalr_range(rvoff)) {
+ upper = (rvoff + (1 << 11)) >> 12;
+ lower = rvoff & 0xfff;
+ emit(rv_auipc(RV_REG_T1, upper), ctx);
+ emit(rv_jalr(rd, RV_REG_T1, lower), ctx);
+ return 0;
}
- upper = (rvoff + (1 << 11)) >> 12;
- lower = rvoff & 0xfff;
- emit(rv_auipc(RV_REG_T1, upper), ctx);
- emit(rv_jalr(rd, RV_REG_T1, lower), ctx);
+ pr_err("bpf-jit: target offset 0x%llx is out of range\n", rvoff);
+ return -ERANGE;
}
static bool is_signed_bpf_cond(u8 cond)
@@ -407,18 +421,16 @@ static int emit_call(bool fixed, u64 addr, struct rv_jit_context *ctx)
s64 off = 0;
u64 ip;
u8 rd;
+ int ret;
if (addr && ctx->insns) {
ip = (u64)(long)(ctx->insns + ctx->ninsns);
off = addr - ip;
- if (!is_32b_int(off)) {
- pr_err("bpf-jit: target call addr %pK is out of range\n",
- (void *)addr);
- return -ERANGE;
- }
}
- emit_jump_and_link(RV_REG_RA, off, !fixed, ctx);
+ ret = emit_jump_and_link(RV_REG_RA, off, !fixed, ctx);
+ if (ret)
+ return ret;
rd = bpf_to_rv_reg(BPF_REG_0, ctx);
emit(rv_addi(rd, RV_REG_A0, 0), ctx);
return 0;
@@ -429,7 +441,7 @@ int bpf_jit_emit_insn(const struct bpf_insn *insn, struct rv_jit_context *ctx,
{
bool is64 = BPF_CLASS(insn->code) == BPF_ALU64 ||
BPF_CLASS(insn->code) == BPF_JMP;
- int s, e, rvoff, i = insn - ctx->prog->insnsi;
+ int s, e, rvoff, ret, i = insn - ctx->prog->insnsi;
struct bpf_prog_aux *aux = ctx->prog->aux;
u8 rd = -1, rs = -1, code = insn->code;
s16 off = insn->off;
@@ -699,7 +711,9 @@ out_be:
/* JUMP off */
case BPF_JMP | BPF_JA:
rvoff = rv_offset(i, off, ctx);
- emit_jump_and_link(RV_REG_ZERO, rvoff, false, ctx);
+ ret = emit_jump_and_link(RV_REG_ZERO, rvoff, false, ctx);
+ if (ret)
+ return ret;
break;
/* IF (dst COND src) JUMP off */
@@ -801,7 +815,6 @@ out_be:
case BPF_JMP | BPF_CALL:
{
bool fixed;
- int ret;
u64 addr;
mark_call(ctx);
@@ -826,7 +839,9 @@ out_be:
break;
rvoff = epilogue_offset(ctx);
- emit_jump_and_link(RV_REG_ZERO, rvoff, false, ctx);
+ ret = emit_jump_and_link(RV_REG_ZERO, rvoff, false, ctx);
+ if (ret)
+ return ret;
break;
/* dst = imm64 */