Add support for sign-extension mov instructions.
Signed-off-by: Hengqi Chen <hengqi.chen@xxxxxxxxx>
---
arch/loongarch/net/bpf_jit.c | 19 +++++++++++++++++--
1 file changed, 17 insertions(+), 2 deletions(-)
diff --git a/arch/loongarch/net/bpf_jit.c b/arch/loongarch/net/bpf_jit.c
index 0c2bbca527ef..ac9edf02675c 100644
--- a/arch/loongarch/net/bpf_jit.c
+++ b/arch/loongarch/net/bpf_jit.c
@@ -472,8 +472,23 @@ static int build_insn(const struct bpf_insn *insn, struct jit_ctx *ctx, bool ext
/* dst = src */
case BPF_ALU | BPF_MOV | BPF_X:
case BPF_ALU64 | BPF_MOV | BPF_X:
- move_reg(ctx, dst, src);
- emit_zext_32(ctx, dst, is32);
+ switch (off) {
+ case 0:
+ move_reg(ctx, dst, src);
+ emit_zext_32(ctx, dst, is32);
+ break;
+ case 8:
+ move_reg(ctx, t1, src);
+ emit_insn(ctx, extwb, dst, t1);
+ break;
+ case 16:
+ move_reg(ctx, t1, src);
+ emit_insn(ctx, extwh, dst, t1);
+ break;
+ case 32:
+ emit_insn(ctx, addw, dst, src, LOONGARCH_GPR_ZERO);
+ break;
+ }
break;
/* dst = imm */
--
2.34.1
