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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 v6 6/6] selftest/bpf: Add tailcall verifier selftest for powerpc64 Date: Thu, 28 May 2026 21:58:55 -0400 Message-ID: <20260529015855.364704-7-adubey@linux.ibm.com> X-Mailer: git-send-email 2.52.0 In-Reply-To: <20260529015855.364704-1-adubey@linux.ibm.com> References: <20260529015855.364704-1-adubey@linux.ibm.com> Precedence: bulk X-Mailing-List: stable@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 Content-Transfer-Encoding: 8bit X-TM-AS-GCONF: 00 X-Authority-Analysis: v=2.4 cv=L4MtheT8 c=1 sm=1 tr=0 ts=6a18bab8 cx=c_pps a=AfN7/Ok6k8XGzOShvHwTGQ==:117 a=AfN7/Ok6k8XGzOShvHwTGQ==:17 a=NGcC8JguVDcA:10 a=VkNPw1HP01LnGYTKEx00:22 a=RnoormkPH1_aCDwRdu11:22 a=iQ6ETzBq9ecOQQE5vZCe:22 a=VnNF1IyMAAAA:8 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malwarescore=0 bulkscore=0 impostorscore=0 adultscore=0 priorityscore=1501 spamscore=0 classifier=typeunknown authscore=0 authtc= authcc= route=outbound adjust=0 reason=mlx scancount=1 engine=8.22.0-2605210000 definitions=main-2605280218 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 8d60c634a114..b754b76420c9 100644 --- a/tools/testing/selftests/bpf/progs/verifier_tailcall_jit.c +++ b/tools/testing/selftests/bpf/progs/verifier_tailcall_jit.c @@ -90,6 +90,75 @@ __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