/*
* Copyright (c) 2021 Apple Inc. All rights reserved.
*
* @APPLE_OSREFERENCE_LICENSE_HEADER_START@
*
* This file contains Original Code and/or Modifications of Original Code
* as defined in and that are subject to the Apple Public Source License
* Version 2.0 (the 'License'). You may not use this file except in
* compliance with the License. The rights granted to you under the License
* may not be used to create, or enable the creation or redistribution of,
* unlawful or unlicensed copies of an Apple operating system, or to
* circumvent, violate, or enable the circumvention or violation of, any
* terms of an Apple operating system software license agreement.
*
* Please obtain a copy of the License at
* http://www.opensource.apple.com/apsl/ and read it before using this file.
*
* The Original Code and all software distributed under the License are
* distributed on an 'AS IS' basis, WITHOUT WARRANTY OF ANY KIND, EITHER
* EXPRESS OR IMPLIED, AND APPLE HEREBY DISCLAIMS ALL SUCH WARRANTIES,
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*/
#include <darwintest.h>
#include <pthread.h>
#include <sys/types.h>
#include <sys/sysctl.h>
T_GLOBAL_META(
T_META_NAMESPACE("xnu.arm"),
T_META_RADAR_COMPONENT_NAME("xnu"),
T_META_RADAR_COMPONENT_VERSION("arm"),
T_META_OWNER("joster"),
T_META_RUN_CONCURRENTLY(true),
T_META_TAG_VM_PREFERRED);
T_DECL(x18_unentitled,
"Test that x18 is trashed when unentitled.")
{
#ifndef __arm64__
T_SKIP("Running on non-arm64 target, skipping...");
#else
uint64_t x18_val;
for (uint64_t i = 0xFEEDB0B000000000ULL; i < 0xFEEDB0B000000000ULL + 10000; ++i) {
asm volatile ("mov x18, %0" : : "r"(i));
sched_yield();
asm volatile ("mov %0, x18" : "=r"(x18_val));
T_QUIET; T_ASSERT_EQ(x18_val, 0ULL, "check that x18 is cleared after yield");
}
#endif
}