bpf, arm64: Support sign-extension mov instructions

[linux-2.6-microblaze.git] / arch / arm64 / net / bpf_jit_comp.c

diff --git a/arch/arm64/net/bpf_jit_comp.c b/arch/arm64/net/bpf_jit_comp.c
index 22f1b0d..9b796e7 100644 (file)
--- a/arch/arm64/net/bpf_jit_comp.c
+++ b/arch/arm64/net/bpf_jit_comp.c
@@ -786,7 +786,20 @@ static int build_insn(const struct bpf_insn *insn, struct jit_ctx *ctx,
        /* dst = src */
        case BPF_ALU | BPF_MOV | BPF_X:
        case BPF_ALU64 | BPF_MOV | BPF_X:
-               emit(A64_MOV(is64, dst, src), ctx);
+               switch (insn->off) {
+               case 0:
+                       emit(A64_MOV(is64, dst, src), ctx);
+                       break;
+               case 8:
+                       emit(A64_SXTB(is64, dst, src), ctx);
+                       break;
+               case 16:
+                       emit(A64_SXTH(is64, dst, src), ctx);
+                       break;
+               case 32:
+                       emit(A64_SXTW(is64, dst, src), ctx);
+                       break;
+               }
                break;
        /* dst = dst OP src */
        case BPF_ALU | BPF_ADD | BPF_X: