diff options
| -rw-r--r-- | arch/arm64/net/bpf_jit.h | 5 | ||||
| -rw-r--r-- | arch/arm64/net/bpf_jit_comp.c | 15 |
2 files changed, 19 insertions, 1 deletions
diff --git a/arch/arm64/net/bpf_jit.h b/arch/arm64/net/bpf_jit.h index 086ffbad0eb5..949810a0c48c 100644 --- a/arch/arm64/net/bpf_jit.h +++ b/arch/arm64/net/bpf_jit.h @@ -192,6 +192,11 @@ #define A64_UXTH(sf, Rd, Rn) A64_UBFM(sf, Rd, Rn, 0, 15) #define A64_UXTW(sf, Rd, Rn) A64_UBFM(sf, Rd, Rn, 0, 31) +/* Sign extend */ +#define A64_SXTB(sf, Rd, Rn) A64_SBFM(sf, Rd, Rn, 0, 7) +#define A64_SXTH(sf, Rd, Rn) A64_SBFM(sf, Rd, Rn, 0, 15) +#define A64_SXTW(sf, Rd, Rn) A64_SBFM(sf, Rd, Rn, 0, 31) + /* Move wide (immediate) */ #define A64_MOVEW(sf, Rd, imm16, shift, type) \ aarch64_insn_gen_movewide(Rd, imm16, shift, \ diff --git a/arch/arm64/net/bpf_jit_comp.c b/arch/arm64/net/bpf_jit_comp.c index 22f1b0d5fb3c..9b796e74ef42 100644 --- 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: |