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Rao" To: Michael Ellerman , Daniel Borkmann , Alexei Starovoitov Subject: [PATCH 11/13] powerpc64/bpf elfv2: Setup kernel TOC in r2 on entry Date: Thu, 6 Jan 2022 17:15:15 +0530 Message-Id: <4501050f6080f12bd3ba1b5d9d7bef8d3aa57d23.1641468127.git.naveen.n.rao@linux.vnet.ibm.com> X-Mailer: git-send-email 2.31.1 In-Reply-To: References: MIME-Version: 1.0 X-TM-AS-GCONF: 00 X-Proofpoint-ORIG-GUID: CHKuxuiRiQx7NG-hMlQFlqYVNjYYK-g6 X-Proofpoint-GUID: T82c7jQWwmqTmqQYGECtzLMGlNNXLnaN X-Proofpoint-Virus-Version: vendor=baseguard engine=ICAP:2.0.205,Aquarius:18.0.790,Hydra:6.0.425,FMLib:17.11.62.513 definitions=2022-01-06_04,2022-01-06_01,2021-12-02_01 X-Proofpoint-Spam-Details: rule=outbound_notspam policy=outbound score=0 priorityscore=1501 clxscore=1015 adultscore=0 impostorscore=0 mlxlogscore=999 lowpriorityscore=0 spamscore=0 suspectscore=0 mlxscore=0 phishscore=0 bulkscore=0 malwarescore=0 classifier=spam adjust=0 reason=mlx scancount=1 engine=8.12.0-2112160000 definitions=main-2201060081 X-BeenThere: linuxppc-dev@lists.ozlabs.org X-Mailman-Version: 2.1.29 Precedence: list List-Id: Linux on PowerPC Developers Mail List List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Cc: ykaliuta@redhat.com, johan.almbladh@anyfinetworks.com, linuxppc-dev@lists.ozlabs.org, song@kernel.org, bpf@vger.kernel.org, Jiri Olsa , Hari Bathini Errors-To: linuxppc-dev-bounces+incoming=patchwork.ozlabs.org@lists.ozlabs.org Sender: "Linuxppc-dev" In preparation for using kernel TOC, load the same in r2 on entry. With elfv1, the kernel TOC is already setup by our caller so we just emit a nop. We adjust the number of instructions to skip on a tail call accordingly. Signed-off-by: Naveen N. Rao --- arch/powerpc/net/bpf_jit_comp64.c | 8 +++++++- 1 file changed, 7 insertions(+), 1 deletion(-) diff --git a/arch/powerpc/net/bpf_jit_comp64.c b/arch/powerpc/net/bpf_jit_comp64.c index ce4fc59bbd6a92..e05b577d95bf11 100644 --- a/arch/powerpc/net/bpf_jit_comp64.c +++ b/arch/powerpc/net/bpf_jit_comp64.c @@ -73,6 +73,12 @@ void bpf_jit_build_prologue(u32 *image, struct codegen_context *ctx) { int i; +#ifdef PPC64_ELF_ABI_v2 + PPC_BPF_LL(_R2, _R13, offsetof(struct paca_struct, kernel_toc)); +#else + EMIT(PPC_RAW_NOP()); +#endif + /* * Initialize tail_call_cnt if we do tail calls. * Otherwise, put in NOPs so that it can be skipped when we are @@ -87,7 +93,7 @@ void bpf_jit_build_prologue(u32 *image, struct codegen_context *ctx) EMIT(PPC_RAW_NOP()); } -#define BPF_TAILCALL_PROLOGUE_SIZE 8 +#define BPF_TAILCALL_PROLOGUE_SIZE 12 if (bpf_has_stack_frame(ctx)) { /*