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://openlab.rt-thread.com/license/LICENSE
 *
 * Change Logs:
 * Date           Author       Notes
 * 2006-09-03     Vai          Nintendo DS version
 */

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

#include "nds.h"

/**
 * @addtogroup nds
 */
/*@{*/

/**
 * 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);
}

/**
 * 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();
}

/**
 * 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();
}

/**
 * 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();
}

/**
 * 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();
}

/**
 * Normally, system will 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();
}

extern rt_isr_handler_t isr_table[];
void rt_hw_trap_irq()
{
    register int offset;
    unsigned long pend;
    rt_isr_handler_t isr_func;

    pend = *((volatile unsigned long *) NDS_IF);

    for (offset = 1; 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 irq */
    *((volatile unsigned long *) NDS_IF) = (0x1 << offset);

    return;
}

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

/*@}*/