/*
 * Copyright 2019 The Hafnium Authors.
 *
 * Licensed under the Apache License, Version 2.0 (the "License");
 * you may not use this file except in compliance with the License.
 * You may obtain a copy of the License at
 *
 *     https://www.apache.org/licenses/LICENSE-2.0
 *
 * Unless required by applicable law or agreed to in writing, software
 * distributed under the License is distributed on an "AS IS" BASIS,
 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 * See the License for the specific language governing permissions and
 * limitations under the License.
 */

#include "sysregs.h"

#include "hf/arch/vm/interrupts.h"

#include "primary_with_secondary.h"
#include "util.h"

/**
 * Tracks the number of times the exception handler has been invoked.
 */
static int num_exceptions = 0;

static bool handle_exception(void)
{
	dlog("%s function is triggered!\n", __func__);
	++num_exceptions;

	/* Skip instruction that triggered the exception. */
	uint64_t next_pc = read_msr(elr_el1);
	next_pc += 4UL;
	write_msr(elr_el1, next_pc);

	/* Indicate that elr_el1 should not be restored. */
	return true;
}

SET_UP(sysregs)
{
	exception_setup(NULL, handle_exception);
}

/**
 * Test that accessing LOR registers would inject an exception.
 */
TEST(sysregs, lor_exception)
{
	num_exceptions = 0;

	EXPECT_EQ(hf_vm_get_id(), HF_PRIMARY_VM_ID);
	TRY_READ(MSR_LORC_EL1);

	EXPECT_EQ(num_exceptions, 1);
}