bpf, x86_64: remove obsolete exception handling from div/mod (3e5b1a39) · Commits · 戴 / test

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:

arch/x86/net/bpf_jit_comp.c

+0 −20

Original line number	Diff line number	Diff line
		@@ -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);