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bpf@vger.kernel.org Cc: hbathini@linux.ibm.com, linuxppc-dev@lists.ozlabs.org, maddy@linux.ibm.com, ast@kernel.org, andrii@kernel.org, daniel@iogearbox.net, shuah@kernel.org, linux-kselftest@vger.kernel.org, stable@vger.kernel.org, Abhishek Dubey Subject: [PATCH bpf v9 6/8] selftest/bpf: Add tailcall verifier selftest for powerpc64 Date: Tue, 23 Jun 2026 19:14:09 -0400 Message-ID: <20260623231411.6216-7-adubey@linux.ibm.com> X-Mailer: git-send-email 2.52.0 In-Reply-To: <20260623231411.6216-1-adubey@linux.ibm.com> References: <20260623231411.6216-1-adubey@linux.ibm.com> Precedence: bulk X-Mailing-List: linux-kselftest@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 Content-Transfer-Encoding: 8bit X-TM-AS-GCONF: 00 X-Proofpoint-GUID: LlbwPd6zez2tNwdw64WoHQADCwZgJBK6 X-Proofpoint-Spam-Info: AW1haW4tMjYwNjIzMDE1NSBTYWx0ZWRfX3kOlTw7vRDe5 1i7XjTwvTDp9i+OtRCUEiHlQZPN4BcO/mrwEVArhA7wZFUwnw/45EaLyJhxYiCUOS/W4GwZyWdQ OvYxJeN0mjVcMgb0PNKTp1/3W9/eOF4= 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engine=ICAP:2.0.293,Aquarius:18.0.1143,Hydra:6.1.125,FMLib:17.12.100.49 definitions=2026-06-23_03,2026-06-23_01,2025-10-01_01 X-Proofpoint-Spam-Details: rule=outbound_notspam policy=outbound score=0 lowpriorityscore=0 impostorscore=0 adultscore=0 clxscore=1015 suspectscore=0 priorityscore=1501 phishscore=0 spamscore=0 bulkscore=0 malwarescore=0 classifier=typeunknown authscore=0 authtc= authcc= route=outbound adjust=0 reason=mlx scancount=1 engine=8.22.0-2606150000 definitions=main-2606230155 From: Abhishek Dubey Verifier testcase result for tailcalls: # ./test_progs -t verifier_tailcall #618/1 verifier_tailcall/invalid map type for tail call:OK #618/2 verifier_tailcall/invalid map type for tail call @unpriv:OK #618 verifier_tailcall:OK #619/1 verifier_tailcall_jit/main:OK #619 verifier_tailcall_jit:OK Summary: 2/3 PASSED, 0 SKIPPED, 0 FAILED Signed-off-by: Abhishek Dubey --- .../bpf/progs/verifier_tailcall_jit.c | 69 +++++++++++++++++++ 1 file changed, 69 insertions(+) diff --git a/tools/testing/selftests/bpf/progs/verifier_tailcall_jit.c b/tools/testing/selftests/bpf/progs/verifier_tailcall_jit.c index 48fa34d2959f..09d7e92c8491 100644 --- a/tools/testing/selftests/bpf/progs/verifier_tailcall_jit.c +++ b/tools/testing/selftests/bpf/progs/verifier_tailcall_jit.c @@ -91,6 +91,75 @@ __jited(" popq %rax") __jited(" jmp {{.*}}") /* jump to tail call tgt */ __jited("L0: leave") __jited(" {{(retq|jmp 0x)}}") /* return or jump to rethunk */ +__arch_powerpc64 +/* program entry for main(), regular function prologue */ +__jited(" nop") +__jited("...") /* ld 2, 16(13) absent with CONFIG_PPC_KERNEL_PCREL */ +__jited(" li 9, 0") +__jited(" std 9, -8(1)") +__jited(" mflr 0") +__jited(" std 0, 16(1)") +__jited(" stdu 1, {{.*}}(1)") +/* load address and call sub() via count register */ +__jited(" lis 12, {{.*}}") +__jited(" sldi 12, 12, 32") +__jited(" oris 12, 12, {{.*}}") +__jited(" ori 12, 12, {{.*}}") +__jited(" mtctr 12") +__jited(" bctrl") +__jited(" mr 8, 3") +__jited(" li 8, 0") +__jited(" addi 1, 1, {{.*}}") +__jited(" ld 0, 16(1)") +__jited(" mtlr 0") +__jited(" mr 3, 8") +__jited(" blr") +__jited("...") +__jited("func #1") +/* subprogram entry for sub() */ +__jited(" nop") +__jited("...") /* ld 2, 16(13) absent with CONFIG_PPC_KERNEL_PCREL */ +/* tail call prologue for subprogram */ +__jited(" ld 10, 0(1)") +__jited(" ld 9, -8(10)") +__jited(" cmpldi 9, 33") +__jited(" bt {{.*}}, {{.*}}") +__jited(" addi 9, 10, -8") +__jited(" std 9, -8(1)") +__jited(" lis {{.*}}, {{.*}}") +__jited(" sldi {{.*}}, {{.*}}, 32") +__jited(" oris {{.*}}, {{.*}}, {{.*}}") +__jited(" ori {{.*}}, {{.*}}, {{.*}}") +__jited(" li {{.*}}, 0") +__jited(" lwz 9, {{.*}}({{.*}})") +__jited(" slwi {{.*}}, {{.*}}, 0") +__jited(" cmplw {{.*}}, 9") +__jited(" bf 0, {{.*}}") +/* bpf_tail_call implementation */ +__jited(" ld 9, -8(1)") +__jited(" cmpldi 9, 33") +__jited(" bf {{.*}}, {{.*}}") +__jited(" ld 9, 0(9)") +__jited(" cmpldi 9, 33") +__jited(" bt {{.*}}, {{.*}}") +__jited(" addi 9, 9, 1") +__jited(" mulli 10, {{.*}}, 8") +__jited(" add 10, 10, {{.*}}") +__jited(" ld 10, {{.*}}(10)") +__jited(" cmpldi 10, 0") +__jited(" bt {{.*}}, {{.*}}") +__jited(" ld 10, {{.*}}(10)") +__jited(" addi 10, 10, {{.*}}") /* offset depends on CONFIG_PPC_KERNEL_PCREL */ +__jited(" mtctr 10") +__jited(" ld 10, -8(1)") +__jited(" cmpldi 10, 33") +__jited(" bt {{.*}}, {{.*}}") +__jited(" addi 10, 1, -8") +__jited(" std 9, 0(10)") +__jited(" bctr") +__jited(" mr 3, 8") +__jited(" blr") + SEC("tc") __naked int main(void) { -- 2.52.0