| Message ID | 20230906183320.1959008-2-puranjay12@gmail.com |
|---|---|
| State | Superseded |
| Headers | show |
| Series | arm32, bpf: add support for cpuv4 insns | expand |
On Wed, Sep 06, 2023 at 06:33:13PM +0000, Puranjay Mohan wrote: > The cpuv4 adds unconditional jump with 32-bit offset where the immediate > field of the instruction is to be used to calculate the jump offset. > > BPF_JA | BPF_K | BPF_JMP32 => gotol +imm => PC += imm. > > Signed-off-by: Puranjay Mohan <puranjay12@gmail.com> Reviewed-by: Russell King (Oracle) <rmk+kernel@armlinux.org.uk> Thanks!
diff --git a/arch/arm/net/bpf_jit_32.c b/arch/arm/net/bpf_jit_32.c index 6a1c9fca5260..c03600fe86f6 100644 --- a/arch/arm/net/bpf_jit_32.c +++ b/arch/arm/net/bpf_jit_32.c @@ -1761,10 +1761,15 @@ static int build_insn(const struct bpf_insn *insn, struct jit_ctx *ctx) break; /* JMP OFF */ case BPF_JMP | BPF_JA: + case BPF_JMP32 | BPF_JA: { - if (off == 0) + if (BPF_CLASS(code) == BPF_JMP32 && imm != 0) + jmp_offset = bpf2a32_offset(i + imm, i, ctx); + else if (BPF_CLASS(code) == BPF_JMP && off != 0) + jmp_offset = bpf2a32_offset(i + off, i, ctx); + else break; - jmp_offset = bpf2a32_offset(i+off, i, ctx); + check_imm24(jmp_offset); emit(ARM_B(jmp_offset), ctx); break;
The cpuv4 adds unconditional jump with 32-bit offset where the immediate field of the instruction is to be used to calculate the jump offset. BPF_JA | BPF_K | BPF_JMP32 => gotol +imm => PC += imm. Signed-off-by: Puranjay Mohan <puranjay12@gmail.com> --- arch/arm/net/bpf_jit_32.c | 9 +++++++-- 1 file changed, 7 insertions(+), 2 deletions(-)