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| author | Yang Shi <yang.shi@linaro.org> | 2015-11-30 14:24:07 -0800 |
|---|---|---|
| committer | David S. Miller <davem@davemloft.net> | 2015-12-03 11:38:31 -0500 |
| commit | df849ba3a88cdf4480decd7008f95ff627387c0f (patch) | |
| tree | 44808eda4e18942ec50fa20340fed46fd075e8d5 /arch/arm64/net | |
| parent | 6bd4f355df2eae80b8a5c7b097371cd1e05f20d5 (diff) | |
| download | linux-df849ba3a88cdf4480decd7008f95ff627387c0f.tar.gz linux-df849ba3a88cdf4480decd7008f95ff627387c0f.tar.xz | |
arm64: bpf: add 'store immediate' instruction
aarch64 doesn't have native store immediate instruction, such operation
has to be implemented by the below instruction sequence:
Load immediate to register
Store register
Signed-off-by: Yang Shi <yang.shi@linaro.org>
CC: Zi Shen Lim <zlim.lnx@gmail.com>
CC: Xi Wang <xi.wang@gmail.com>
Reviewed-by: Zi Shen Lim <zlim.lnx@gmail.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
Diffstat (limited to 'arch/arm64/net')
| -rw-r--r-- | arch/arm64/net/bpf_jit_comp.c | 20 |
1 files changed, 19 insertions, 1 deletions
diff --git a/arch/arm64/net/bpf_jit_comp.c b/arch/arm64/net/bpf_jit_comp.c index 7cf032bebf8c..b162ad70effc 100644 --- a/arch/arm64/net/bpf_jit_comp.c +++ b/arch/arm64/net/bpf_jit_comp.c @@ -590,7 +590,25 @@ emit_cond_jmp: case BPF_ST | BPF_MEM | BPF_H: case BPF_ST | BPF_MEM | BPF_B: case BPF_ST | BPF_MEM | BPF_DW: - goto notyet; + /* Load imm to a register then store it */ + ctx->tmp_used = 1; + emit_a64_mov_i(1, tmp2, off, ctx); + emit_a64_mov_i(1, tmp, imm, ctx); + switch (BPF_SIZE(code)) { + case BPF_W: + emit(A64_STR32(tmp, dst, tmp2), ctx); + break; + case BPF_H: + emit(A64_STRH(tmp, dst, tmp2), ctx); + break; + case BPF_B: + emit(A64_STRB(tmp, dst, tmp2), ctx); + break; + case BPF_DW: + emit(A64_STR64(tmp, dst, tmp2), ctx); + break; + } + break; /* STX: *(size *)(dst + off) = src */ case BPF_STX | BPF_MEM | BPF_W: |