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| author | Xu Kuohai <xukuohai@huawei.com> | 2023-08-15 11:41:54 -0400 |
|---|---|---|
| committer | Daniel Borkmann <daniel@iogearbox.net> | 2023-08-18 15:45:58 +0200 |
| commit | bb0a1d6b49cb8293b09d290536315b4a134ef1e7 (patch) | |
| tree | 363b297ca0a1461c8ac0a4572468be6e465a9c43 /arch/arm64/net | |
| parent | cc88f540da52d418ede80846c2fd771a4ef19227 (diff) | |
| download | lwn-bb0a1d6b49cb8293b09d290536315b4a134ef1e7.tar.gz lwn-bb0a1d6b49cb8293b09d290536315b4a134ef1e7.zip | |
bpf, arm64: Support sign-extension mov instructions
Add JIT support for BPF sign-extension mov instructions with arm64
SXTB/SXTH/SXTW instructions.
Signed-off-by: Xu Kuohai <xukuohai@huawei.com>
Signed-off-by: Daniel Borkmann <daniel@iogearbox.net>
Tested-by: Florent Revest <revest@chromium.org>
Acked-by: Florent Revest <revest@chromium.org>
Link: https://lore.kernel.org/bpf/20230815154158.717901-4-xukuohai@huaweicloud.com
Diffstat (limited to 'arch/arm64/net')
| -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: |