mirror of
https://mirrors.bfsu.edu.cn/git/linux.git
synced 2024-12-05 18:14:07 +08:00
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>
This commit is contained in:
parent
f6b1b3bf0d
commit
3e5b1a39d7
@ -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);
|
||||
|
Loading…
Reference in New Issue
Block a user