/*
 * Copyright (c) 2014 Wind River Systems, Inc.
 *
 * SPDX-License-Identifier: Apache-2.0
 */

/**
 * @file
 * @brief Common fault handler for ARCv2
 *
 * Common fault handler for ARCv2 processors.
 */

#include <toolchain.h>
#include <linker/sections.h>
#include <inttypes.h>

#include <kernel.h>
#include <kernel_structs.h>
#include <misc/printk.h>

/*
 * @brief Fault handler
 *
 * This routine is called when fatal error conditions are detected by hardware
 * and is responsible only for reporting the error. Once reported, it then
 * invokes the user provided routine _SysFatalErrorHandler() which is
 * responsible for implementing the error handling policy.
 *
 * @return This function does not return.
 */
void _Fault(void)
{
	u32_t vector, code, parameter;
	u32_t exc_addr = _arc_v2_aux_reg_read(_ARC_V2_EFA);
	u32_t ecr = _arc_v2_aux_reg_read(_ARC_V2_ECR);

	vector = _ARC_V2_ECR_VECTOR(ecr);
	code =  _ARC_V2_ECR_CODE(ecr);
	parameter = _ARC_V2_ECR_PARAMETER(ecr);

	printk("Exception vector: 0x%x, cause code: 0x%x, parameter 0x%x\n",
	       vector, code, parameter);
	printk("Address 0x%x\n", exc_addr);
#ifdef CONFIG_ARC_STACK_CHECKING
	/* Vector 6 = EV_ProV. Regardless of code, parameter 2 means stack
	 * check violation
	 */
	if (vector == 6 && parameter == 2) {
		_NanoFatalErrorHandler(_NANO_ERR_STACK_CHK_FAIL, &_default_esf);
	}
#endif
	_NanoFatalErrorHandler(_NANO_ERR_HW_EXCEPTION, &_default_esf);
}