bpf, x86_64: 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 x86_64 JIT.

Signed-off-by: Daniel Borkmann <daniel@iogearbox.net>
Acked-by: Alexei Starovoitov <ast@kernel.org>
Signed-off-by: Alexei Starovoitov <ast@kernel.org>

1 files changed, 0 insertions, 20 deletions

diff --git a/arch/x86/net/bpf_jit_comp.c b/arch/x86/net/bpf_jit_comp.c
index 5acee5139e28..4923d92f918d 100644
--- a/arch/x86/net/bpf_jit_comp.c
+++ b/arch/x86/net/bpf_jit_comp.c
@@ -568,26 +568,6 @@ static int do_jit(struct bpf_prog *bpf_prog, int *addrs, u8 *image,
                          */
                         EMIT2(0x31, 0xd2);
 
-                        if (BPF_SRC(insn->code) == BPF_X) {
-                                /* if (src_reg == 0) return 0 */
-
-                                /* cmp r11, 0 */
-                                EMIT4(0x49, 0x83, 0xFB, 0x00);
-
-                                /* jne .+9 (skip over pop, pop, xor and jmp) */
-                                EMIT2(X86_JNE, 1 + 1 + 2 + 5);
-                                EMIT1(0x5A); /* pop rdx */
-                                EMIT1(0x58); /* pop rax */
-                                EMIT2(0x31, 0xc0); /* xor eax, eax */
-
-                                /* jmp cleanup_addr
-                                 * addrs[i] - 11, because there are 11 bytes
-                                 * after this insn: div, mov, pop, pop, mov
-                                 */
-                                jmp_offset = ctx->cleanup_addr - (addrs[i] - 11);
-                                EMIT1_off32(0xE9, jmp_offset);
-                        }
-
                         if (BPF_CLASS(insn->code) == BPF_ALU64)
                                 /* div r11 */
                                 EMIT3(0x49, 0xF7, 0xF3);