tjh.dev
+25
-9
arch/loongarch/net/bpf_jit.c
+25
-9
arch/loongarch/net/bpf_jit.c
···
588
588
/* dst = dst % src */
589
589
case BPF_ALU | BPF_MOD | BPF_X:
590
590
case BPF_ALU64 | BPF_MOD | BPF_X:
591
-
emit_zext_32(ctx, dst, is32);
592
-
move_reg(ctx, t1, src);
593
-
emit_zext_32(ctx, t1, is32);
594
-
emit_insn(ctx, moddu, dst, dst, t1);
595
-
emit_zext_32(ctx, dst, is32);
591
+
if (!off) {
592
+
emit_zext_32(ctx, dst, is32);
593
+
move_reg(ctx, t1, src);
594
+
emit_zext_32(ctx, t1, is32);
595
+
emit_insn(ctx, moddu, dst, dst, t1);
596
+
emit_zext_32(ctx, dst, is32);
597
+
} else {
598
+
emit_sext_32(ctx, dst, is32);
599
+
move_reg(ctx, t1, src);
600
+
emit_sext_32(ctx, t1, is32);
601
+
emit_insn(ctx, modd, dst, dst, t1);
602
+
emit_sext_32(ctx, dst, is32);
603
+
}
596
604
break;
597
605
598
606
/* dst = dst % imm */
599
607
case BPF_ALU | BPF_MOD | BPF_K:
600
608
case BPF_ALU64 | BPF_MOD | BPF_K:
601
-
move_imm(ctx, t1, imm, is32);
602
-
emit_zext_32(ctx, dst, is32);
603
-
emit_insn(ctx, moddu, dst, dst, t1);
604
-
emit_zext_32(ctx, dst, is32);
609
+
if (!off) {
610
+
move_imm(ctx, t1, imm, is32);
611
+
emit_zext_32(ctx, dst, is32);
612
+
emit_insn(ctx, moddu, dst, dst, t1);
613
+
emit_zext_32(ctx, dst, is32);
614
+
} else {
615
+
move_imm(ctx, t1, imm, false);
616
+
emit_sext_32(ctx, t1, is32);
617
+
emit_sext_32(ctx, dst, is32);
618
+
emit_insn(ctx, modd, dst, dst, t1);
619
+
emit_sext_32(ctx, dst, is32);
620
+
}
605
621
break;
606
622
607
623
/* dst = -dst */