trap.c

RT-Thread是发展中的下一代微内核嵌入式实时操作系统

/*
 * File      : trap.c
 * This file is part of RT-Thread RTOS
 * COPYRIGHT (C) 2006, RT-Thread Development Team
 *
 * The license and distribution terms for this file may be
 * found in the file LICENSE in this distribution or at
 * http://www.fayfayspace.org/license/LICENSE.
 *
 * Change Logs:
 * Date           Author       Notes
 * 2006-03-13     Bernard      first version
 * 2006-05-27     Bernard      add skyeye support
 */

#include <rtthread.h>
#include <rthw.h>

#include "s3c4510.h"

/*!
 * \addtogroup xgs3c4510
 */
/*@{*/

/*!
 * \brief show CPU's registers
 *
 * this function will show registers of CPU
 *
 * \param regs the registers point
 */
void rt_hw_show_register (struct rt_hw_register *regs)
{
	rt_kprintf("Execption:\n");
	rt_kprintf("r00:0x%08x r01:0x%08x r02:0x%08x r03:0x%08x\n", regs->r0, regs->r1, regs->r2, regs->r3);
	rt_kprintf("r04:0x%08x r05:0x%08x r06:0x%08x r07:0x%08x\n", regs->r4, regs->r5, regs->r6, regs->r7);
	rt_kprintf("r08:0x%08x r09:0x%08x r10:0x%08x\n", regs->r8, regs->r9, regs->r10);
	rt_kprintf("fp :0x%08x ip :0x%08x\n", regs->fp, regs->ip);
	rt_kprintf("sp :0x%08x lr :0x%08x pc :0x%08x\n", regs->sp, regs->lr, regs->pc);
	rt_kprintf("cpsr:0x%08x\n", regs->cpsr);
}

/*!
 * \brief trap because undefined instruction
 *
 * When ARM7TDMI comes across an instruction which it cannot handle, 
 * it takes the undefined instruction trap.
 *
 * \param regs system registers
 *
 * \note never invoke this function in application
 */
void rt_hw_trap_udef(struct rt_hw_register *regs)
{
    rt_kprintf("undefined instruction\n");
    rt_hw_show_register(regs);
    rt_hw_cpu_shutdown();
}

/*!
 * \brief trap because software interrupt
 *
 * The software interrupt instruction (SWI) is used for entering 
 * Supervisor mode, usually to request a particular supervisor 
 * function.
 *
 * \param regs system registers
 *
 * \note never invoke this function in application
 */
void rt_hw_trap_swi(struct rt_hw_register *regs)
{
    rt_kprintf("software interrupt\n");
    rt_hw_show_register(regs);
    rt_hw_cpu_shutdown();
}

/*!
 * \brief trap because abort occurs during an instruction prefetch.
 *
 * An abort indicates that the current memory access cannot be completed,
 * which occurs during an instruction prefetch.
 *
 * \param regs system registers
 *
 * \note never invoke this function in application
 */
void rt_hw_trap_pabt(struct rt_hw_register *regs)
{
    rt_kprintf("prefetch abort\n");
    rt_hw_show_register(regs);
    rt_hw_cpu_shutdown();
}

/*!
 * \brief trap because abort occurs during a data access.
 *
 * An abort indicates that the current memory access cannot be completed,
 * which occurs during a data access.
 *
 * \param regs system registers
 *
 * \note never invoke this function in application
 */
void rt_hw_trap_dabt(struct rt_hw_register *regs)
{
    rt_kprintf("Data Abort ");
    rt_hw_show_register(regs);
    rt_hw_cpu_shutdown();
}

/*!
 * \brief trap because reserved reason
 *
 * normally, never reach here
 *
 * \param regs system registers
 *
 * \note never invoke this function in application
 */
void rt_hw_trap_resv(struct rt_hw_register *regs)
{
    rt_kprintf("not used\n");
    rt_hw_show_register(regs);
    rt_hw_cpu_shutdown();
}

#define __SKYEYE__
extern rt_isr_handler_t isr_table[];
void rt_hw_trap_irq()
{
#ifndef __SKYEYE__
	unsigned long intstat;
	rt_isr_handler_t isr_func;

	intstat = INTOFFSET;

	/* check pending according um_4510b */
	if ( intstat == 0x54 ) return;
	else intstat = intstat >> 2;

	/* get interrupt service routine */
	isr_func = isr_table[intstat];

	/* turn to interrupt service routine */
	isr_func(intstat);

	/* clear pending register */
	INTPEND = 1 << intstat;
#else
	register int offset;
	unsigned long pend;
	rt_isr_handler_t isr_func;

	pend = INTPEND;

	for (offset = 0; offset < INTGLOBAL; offset ++)
	{
		if (pend & (1 << offset)) break;
	}
	if (offset == INTGLOBAL) return;

	/* get interrupt service routine */
	isr_func = isr_table[offset];

	/* turn to interrupt service routine */
	isr_func(offset);

	/* clear pending register */
	INTPEND = 1 << offset;
#endif 
}

void rt_hw_trap_fiq()
{
    rt_kprintf("fast interrupt request\n");
}

/*@}*/