| Message ID | 1377643952-10388-1-git-send-email-murzin.v@gmail.com (mailing list archive) |
|---|---|
| State | New, archived |
| Headers | show |
Ping On Wed, Aug 28, 2013 at 02:52:32AM +0400, Vladimir Murzin wrote: > commit b6069a9570 (filter: add MOD operation) added generic > support for modulus operation in BPF. > > This patch brings JIT support for ARM. > > Signed-off-by: Vladimir Murzin <murzin.v@gmail.com> > --- > arch/arm/net/bpf_jit_32.c | 18 ++++++++++++++++++ > 1 file changed, 18 insertions(+) > > diff --git a/arch/arm/net/bpf_jit_32.c b/arch/arm/net/bpf_jit_32.c > index f50d223..0bfff55 100644 > --- a/arch/arm/net/bpf_jit_32.c > +++ b/arch/arm/net/bpf_jit_32.c > @@ -636,6 +636,24 @@ load_ind: > update_on_xread(ctx); > emit(ARM_MUL(r_A, r_A, r_X), ctx); > break; > + case BPF_S_ALU_MOD_X: /* A %= X; */ > + update_on_xread(ctx); > + emit(ARM_CMP_I(r_X, 0), ctx); > + emit_err_ret(ARM_COND_EQ, ctx); > + emit_udiv(r_scratch, r_A, r_X, ctx); > + emit(ARM_MUL(r_scratch, r_X, r_scratch), ctx); > + emit(ARM_SUB_R(r_A, r_A, r_scratch), ctx); > + break; > + case BPF_S_ALU_MOD_K: /* A %= K; */ > + /* > + * reuse ARM_R1 as the temp register - it should be safe > + * as soon as udiv may touch it too. > + */ > + emit_mov_i(ARM_R1, k, ctx); > + emit_udiv(r_scratch, r_A, ARM_R1, ctx); > + emit(ARM_MUL(r_scratch, ARM_R1, r_scratch), ctx); > + emit(ARM_SUB_R(r_A, r_A, r_scratch), ctx); > + break; > case BPF_S_ALU_DIV_K: > /* current k == reciprocal_value(userspace k) */ > emit_mov_i(r_scratch, k, ctx); > -- > 1.8.1.5 >
diff --git a/arch/arm/net/bpf_jit_32.c b/arch/arm/net/bpf_jit_32.c index f50d223..0bfff55 100644 --- a/arch/arm/net/bpf_jit_32.c +++ b/arch/arm/net/bpf_jit_32.c @@ -636,6 +636,24 @@ load_ind: update_on_xread(ctx); emit(ARM_MUL(r_A, r_A, r_X), ctx); break; + case BPF_S_ALU_MOD_X: /* A %= X; */ + update_on_xread(ctx); + emit(ARM_CMP_I(r_X, 0), ctx); + emit_err_ret(ARM_COND_EQ, ctx); + emit_udiv(r_scratch, r_A, r_X, ctx); + emit(ARM_MUL(r_scratch, r_X, r_scratch), ctx); + emit(ARM_SUB_R(r_A, r_A, r_scratch), ctx); + break; + case BPF_S_ALU_MOD_K: /* A %= K; */ + /* + * reuse ARM_R1 as the temp register - it should be safe + * as soon as udiv may touch it too. + */ + emit_mov_i(ARM_R1, k, ctx); + emit_udiv(r_scratch, r_A, ARM_R1, ctx); + emit(ARM_MUL(r_scratch, ARM_R1, r_scratch), ctx); + emit(ARM_SUB_R(r_A, r_A, r_scratch), ctx); + break; case BPF_S_ALU_DIV_K: /* current k == reciprocal_value(userspace k) */ emit_mov_i(r_scratch, k, ctx);
commit b6069a9570 (filter: add MOD operation) added generic support for modulus operation in BPF. This patch brings JIT support for ARM. Signed-off-by: Vladimir Murzin <murzin.v@gmail.com> --- arch/arm/net/bpf_jit_32.c | 18 ++++++++++++++++++ 1 file changed, 18 insertions(+)