Function handle_trap

libcpu/risc-v/common64/trap.c:295–386

Trap entry */

/* Trap entry */
void handle_trap(rt_ubase_t scause, rt_ubase_t stval, rt_ubase_t sepc,
                 struct rt_hw_stack_frame *sp)
{
    ENTER_TRAP;
    rt_ubase_t id = __MASKVALUE(scause, __MASK(63UL));
    const char *msg;

    /* supervisor external interrupt */
    if ((SCAUSE_INTERRUPT & scause) &&
        SCAUSE_S_EXTERNAL_INTR == (scause & 0xff))
    {
        rt_interrupt_enter();
        plic_handle_irq();
        rt_interrupt_leave();
    }
    else if ((SCAUSE_INTERRUPT | SCAUSE_S_TIMER_INTR) == scause)
    {
        /* supervisor timer */
        rt_interrupt_enter();
        tick_isr();
        rt_interrupt_leave();
    }
    else
    {
        if (SCAUSE_INTERRUPT & scause)
        {
            if (id < sizeof(Interrupt_Name) / sizeof(const char *))
            {
                msg = Interrupt_Name[id];
            }
            else
            {
                msg = "Unknown Interrupt";
            }

            LOG_E("Unhandled Interrupt %ld:%s\n", id, msg);
        }
        else
        {
#ifdef ARCH_RISCV_VECTOR
            if (scause == 0x2)
            {
                if (!(sp->sstatus & SSTATUS_VS) &&
                    illegal_inst_recoverable(stval, sp))
                    goto _exit;
            }
#endif /* ARCH_RISCV_VECTOR */
#ifdef RT_USING_SMART
            if (!(sp->sstatus & 0x100) || (PAGE_FAULT && IN_USER_SPACE))
            {
                handle_user(scause, stval, sepc, sp);
                // if handle_user() return here, jump to u mode then
                goto _exit;
            }
#endif

            // handle kernel exception:
            rt_kprintf("Unhandled Exception %ld:%s\n", id,