linux-kernel - Re: [PATCH] RFC: arm: eBPF JIT compiler

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Date:   Tue, 23 May 2017 22:46:08 +0200
From:   Andrew Lunn <andrew@...n.ch>
To:     Shubham Bansal <illusionist.neo@...il.com>
Cc:     linux@...linux.org.uk, linux-kernel@...r.kernel.org,
        linux-arm-kernel@...ts.infradead.org
Subject: Re: [PATCH] RFC: arm: eBPF JIT compiler

On Wed, May 24, 2017 at 12:03:53AM +0530, Shubham Bansal wrote:
> The JIT compiler emits ARM 32 bit instructions. Currently, It supports
> eBPF only. Classic BPF is supported because of the conversion by BPF
> core.

make mvebu_v5_defconfig

make -s -j 16
arch/arm/net/bpf_jit_32.c: In function emit_rev16:
arch/arm/net/bpf_jit_32.c:1019:7: error: implicit declaration of function ARM_MOV_S [-Werror=implicit-function-declaration]
  emit(ARM_MOV_S(tmp2[0], rn, SRTYPE_LSR, 8), ctx);
       ^~~~~~~~~
arch/arm/net/bpf_jit_32.c: In function emit_rev32:
arch/arm/net/bpf_jit_32.c:1037:36: error: macro "ARM_MOV_I" passed 3 arguments, but takes just 2
  emit(ARM_MOV_I(tmp2[1], rn, 0xff00), ctx);
                                    ^
arch/arm/net/bpf_jit_32.c:1037:7: error: ARM_MOV_I undeclared (first use in this function)
  emit(ARM_MOV_I(tmp2[1], rn, 0xff00), ctx);
       ^~~~~~~~~
arch/arm/net/bpf_jit_32.c:1037:7: note: each undeclared identifier is reported only once for each function it appears in
arch/arm/net/bpf_jit_32.c:1039:41: error: macro "ARM_MOV_I" passed 3 arguments, but takes just 2
  emit(ARM_MOV_I(tmp2[0], tmp2[0], 0xff00), ctx);
                                         ^
arch/arm/net/bpf_jit_32.c: In function build_insn:
arch/arm/net/bpf_jit_32.c:1393:30: error: macro "ARM_AND_R" requires 3 arguments, but only 2 given
    emit(ARM_AND_R(rt, tmp2[1]), ctx);
                              ^
arch/arm/net/bpf_jit_32.c:1393:9: error: ARM_AND_R undeclared (first use in this function)
    emit(ARM_AND_R(rt, tmp2[1]), ctx);

    Andrew