Commit 7b6b13d3 authored by Hengqi Chen's avatar Hengqi Chen Committed by Huacai Chen
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LoongArch: BPF: Support signed mod instructions 



Add support for signed mod instructions.

Signed-off-by: default avatarHengqi Chen <hengqi.chen@gmail.com>
Signed-off-by: default avatarHuacai Chen <chenhuacai@loongson.cn>
parent 2425c9e0

arch/loongarch/net/bpf_jit.c

+25 −9
Original line number Diff line number Diff line
@@ -588,20 +588,36 @@ static int build_insn(const struct bpf_insn *insn, struct jit_ctx *ctx, bool ext 
	/* dst = dst % src */

	case BPF_ALU | BPF_MOD | BPF_X:

	case BPF_ALU64 | BPF_MOD | BPF_X:

		if (!off) {

			emit_zext_32(ctx, dst, is32);

			move_reg(ctx, t1, src);

			emit_zext_32(ctx, t1, is32);

			emit_insn(ctx, moddu, dst, dst, t1);

			emit_zext_32(ctx, dst, is32);

		} else {

			emit_sext_32(ctx, dst, is32);

			move_reg(ctx, t1, src);

			emit_sext_32(ctx, t1, is32);

			emit_insn(ctx, modd, dst, dst, t1);

			emit_sext_32(ctx, dst, is32);

		}

		break;



	/* dst = dst % imm */

	case BPF_ALU | BPF_MOD | BPF_K:

	case BPF_ALU64 | BPF_MOD | BPF_K:

		if (!off) {

			move_imm(ctx, t1, imm, is32);

			emit_zext_32(ctx, dst, is32);

			emit_insn(ctx, moddu, dst, dst, t1);

			emit_zext_32(ctx, dst, is32);

		} else {

			move_imm(ctx, t1, imm, false);

			emit_sext_32(ctx, t1, is32);

			emit_sext_32(ctx, dst, is32);

			emit_insn(ctx, modd, dst, dst, t1);

			emit_sext_32(ctx, dst, is32);

		}

		break;



	/* dst = -dst */