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bpf, arm64: remove obsolete exception handling from div/mod 

Since we've changed div/mod exception handling for src_reg in
eBPF verifier itself, remove the leftovers from arm64 JIT.

Signed-off-by: Daniel Borkmann <daniel@iogearbox.net>
Acked-by: Alexei Starovoitov <ast@kernel.org>
Signed-off-by: Alexei Starovoitov <ast@kernel.org>
This commit is contained in:
Daniel Borkmann 2018-01-26 23:33:41 +01:00 committed by Alexei Starovoitov
parent 3e5b1a39d7
commit 96a71005bd
1 changed files with 0 additions and 13 deletions
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13
arch/arm64/net/bpf_jit_comp.c
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@ -390,18 +390,6 @@ static int build_insn(const struct bpf_insn *insn, struct jit_ctx *ctx)
case BPF_ALU64 | BPF_DIV | BPF_X:
case BPF_ALU | BPF_MOD | BPF_X:
case BPF_ALU64 | BPF_MOD | BPF_X:
{
const u8 r0 = bpf2a64[BPF_REG_0];
/* if (src == 0) return 0 */
jmp_offset = 3; /* skip ahead to else path */
check_imm19(jmp_offset);
emit(A64_CBNZ(is64, src, jmp_offset), ctx);
emit(A64_MOVZ(1, r0, 0, 0), ctx);
jmp_offset = epilogue_offset(ctx);
check_imm26(jmp_offset);
emit(A64_B(jmp_offset), ctx);
/* else */
switch (BPF_OP(code)) {
case BPF_DIV:
emit(A64_UDIV(is64, dst, dst, src), ctx);
@ -413,7 +401,6 @@ static int build_insn(const struct bpf_insn *insn, struct jit_ctx *ctx)
break;
}
break;
}
case BPF_ALU | BPF_LSH | BPF_X:
case BPF_ALU64 | BPF_LSH | BPF_X:
emit(A64_LSLV(is64, dst, dst, src), ctx);