diff --git a/tools/testing/selftests/bpf/progs/verifier_loops1.c b/tools/testing/selftests/bpf/progs/verifier_loops1.c index d248ce877f14..48a966cda199 100644 --- a/tools/testing/selftests/bpf/progs/verifier_loops1.c +++ b/tools/testing/selftests/bpf/progs/verifier_loops1.c @@ -303,4 +303,40 @@ __naked void maybe_exit_scc_bug1(void) ::: __clobber_all); } +/* + * The loop reads zero from the caller's stack on its first iteration and + * one from the callee's stack on its second iteration. At the loop header, + * only the frame number of the pointer in r1 changes. + */ +static __naked __noinline __used +void loop_stack_frames_reg(void) +{ + asm volatile ( + "*(u64 *)(r10 - 8) = 1;" +"1:" + "r0 = *(u64 *)(r1 + 0);" + "if r0 != 0 goto 2f;" + "r1 = r10;" + "r1 += -8;" + "goto 1b;" +"2:" + "exit;" + ::: __clobber_all); +} + +SEC("xdp") +__description("bounded loop changing stack frame in a register") +__success __retval(1) +__flag(BPF_F_TEST_STATE_FREQ) +__naked void bounded_loop_stack_frames_reg(void) +{ + asm volatile ( + "*(u64 *)(r10 - 8) = 0;" + "r1 = r10;" + "r1 += -8;" + "call loop_stack_frames_reg;" + "exit;" + ::: __clobber_all); +} + char _license[] SEC("license") = "GPL";