/*
 * Copyright 2004-2009 Analog Devices Inc.
 *
 * Licensed under the GPL-2 or later
 */

#include <linux/bug.h>
#include <linux/uaccess.h>
#include <linux/interrupt.h>
#include <linux/module.h>
#include <linux/kallsyms.h>
#include <linux/fs.h>
#include <linux/rbtree.h>
#include <asm/traps.h>
#include <asm/cacheflush.h>
#include <asm/cplb.h>
#include <asm/dma.h>
#include <asm/blackfin.h>
#include <asm/irq_handler.h>
#include <linux/irq.h>
#include <asm/trace.h>
#include <asm/fixed_code.h>

#ifdef CONFIG_KGDB
# include <linux/kgdb.h>

# define CHK_DEBUGGER_TRAP() \
        do { \
                kgdb_handle_exception(trapnr, sig, info.si_code, fp); \
        } while (0)
# define CHK_DEBUGGER_TRAP_MAYBE() \
        do { \
                if (kgdb_connected) \
                        CHK_DEBUGGER_TRAP(); \
        } while (0)
#else
# define CHK_DEBUGGER_TRAP() do { } while (0)
# define CHK_DEBUGGER_TRAP_MAYBE() do { } while (0)
#endif


#ifdef CONFIG_DEBUG_VERBOSE
#define verbose_printk(fmt, arg...) \
        printk(fmt, ##arg)
#else
#define verbose_printk(fmt, arg...) \
        ({ if (0) printk(fmt, ##arg); 0; })
#endif

#if defined(CONFIG_DEBUG_MMRS) || defined(CONFIG_DEBUG_MMRS_MODULE)
u32 last_seqstat;
#ifdef CONFIG_DEBUG_MMRS_MODULE
EXPORT_SYMBOL(last_seqstat);
#endif
#endif

/* Initiate the event table handler */
void __init trap_init(void)
{
        CSYNC();
        bfin_write_EVT3(trap);
        CSYNC();
}

static void decode_address(char *buf, unsigned long address)
{
#ifdef CONFIG_DEBUG_VERBOSE
        struct task_struct *p;
        struct mm_struct *mm;
        unsigned long flags, offset;
        unsigned char in_atomic = (bfin_read_IPEND() & 0x10) || in_atomic();
        struct rb_node *n;

#ifdef CONFIG_KALLSYMS
        unsigned long symsize;
        const char *symname;
        char *modname;
        char *delim = ":";
        char namebuf[128];
#endif

        buf += sprintf(buf, "<0x%08lx> ", address);

#ifdef CONFIG_KALLSYMS
        /* look up the address and see if we are in kernel space */
        symname = kallsyms_lookup(address, &symsize, &offset, &modname, namebuf);

        if (symname) {
                /* yeah! kernel space! */
                if (!modname)
                        modname = delim = "";
                sprintf(buf, "{ %s%s%s%s + 0x%lx }",
                        delim, modname, delim, symname,
                        (unsigned long)offset);
                return;
        }
#endif

        if (address >= FIXED_CODE_START && address < FIXED_CODE_END) {
                /* Problem in fixed code section? */
                strcat(buf, "/* Maybe fixed code section */");
                return;

        } else if (address < CONFIG_BOOT_LOAD) {
                /* Problem somewhere before the kernel start address */
                strcat(buf, "/* Maybe null pointer? */");
                return;

        } else if (address >= COREMMR_BASE) {
                strcat(buf, "/* core mmrs */");
                return;

        } else if (address >= SYSMMR_BASE) {
                strcat(buf, "/* system mmrs */");
                return;

        } else if (address >= L1_ROM_START && address < L1_ROM_START + L1_ROM_LENGTH) {
                strcat(buf, "/* on-chip L1 ROM */");
                return;
        }

        /* looks like we're off in user-land, so let's walk all the
         * mappings of all our processes and see if we can't be a whee
         * bit more specific
         */
        write_lock_irqsave(&tasklist_lock, flags);
        for_each_process(p) {
                mm = (in_atomic ? p->mm : get_task_mm(p));
                if (!mm)
                        continue;

                for (n = rb_first(&mm->mm_rb); n; n = rb_next(n)) {
                        struct vm_area_struct *vma;

                        vma = rb_entry(n, struct vm_area_struct, vm_rb);

                        if (address >= vma->vm_start && address < vma->vm_end) {
                                char _tmpbuf[256];
                                char *name = p->comm;
                                struct file *file = vma->vm_file;

                                if (file) {
                                        char *d_name = d_path(&file->f_path, _tmpbuf,
                                                      sizeof(_tmpbuf));
                                        if (!IS_ERR(d_name))
                                                name = d_name;
                                }

                                /* FLAT does not have its text aligned to the start of
                                 * the map while FDPIC ELF does ...
                                 */

                                /* before we can check flat/fdpic, we need to
                                 * make sure current is valid
                                 */
                                if ((unsigned long)current >= FIXED_CODE_START &&
                                    !((unsigned long)current & 0x3)) {
                                        if (current->mm &&
                                            (address > current->mm->start_code) &&
                                            (address < current->mm->end_code))
                                                offset = address - current->mm->start_code;
                                        else
                                                offset = (address - vma->vm_start) +
                                                         (vma->vm_pgoff << PAGE_SHIFT);

                                        sprintf(buf, "[ %s + 0x%lx ]", name, offset);
                                } else
                                        sprintf(buf, "[ %s vma:0x%lx-0x%lx]",
                                                name, vma->vm_start, vma->vm_end);

                                if (!in_atomic)
                                        mmput(mm);

                                if (buf[0] == '\0')
                                        sprintf(buf, "[ %s ] dynamic memory", name);

                                goto done;
                        }
                }
                if (!in_atomic)
                        mmput(mm);
        }

        /* we were unable to find this address anywhere */
        sprintf(buf, "/* kernel dynamic memory */");

done:
        write_unlock_irqrestore(&tasklist_lock, flags);
#else
        sprintf(buf, " ");
#endif
}

asmlinkage void double_fault_c(struct pt_regs *fp)
{
#ifdef CONFIG_DEBUG_BFIN_HWTRACE_ON
        int j;
        trace_buffer_save(j);
#endif

        console_verbose();
        oops_in_progress = 1;
#ifdef CONFIG_DEBUG_VERBOSE
        printk(KERN_EMERG "Double Fault\n");
#ifdef CONFIG_DEBUG_DOUBLEFAULT_PRINT
        if (((long)fp->seqstat &  SEQSTAT_EXCAUSE) == VEC_UNCOV) {
                unsigned int cpu = raw_smp_processor_id();
                char buf[150];
                decode_address(buf, cpu_pda[cpu].retx_doublefault);
                printk(KERN_EMERG "While handling exception (EXCAUSE = 0x%x) at %s:\n",
                        (unsigned int)cpu_pda[cpu].seqstat_doublefault & SEQSTAT_EXCAUSE, buf);
                decode_address(buf, cpu_pda[cpu].dcplb_doublefault_addr);
                printk(KERN_NOTICE "   DCPLB_FAULT_ADDR: %s\n", buf);
                decode_address(buf, cpu_pda[cpu].icplb_doublefault_addr);
                printk(KERN_NOTICE "   ICPLB_FAULT_ADDR: %s\n", buf);

                decode_address(buf, fp->retx);
                printk(KERN_NOTICE "The instruction at %s caused a double exception\n", buf);
        } else
#endif
        {
                dump_bfin_process(fp);
                dump_bfin_mem(fp);
                show_regs(fp);
                dump_bfin_trace_buffer();
        }
#endif
        panic("Double Fault - unrecoverable event");

}

static int kernel_mode_regs(struct pt_regs *regs)
{
        return regs->ipend & 0xffc0;
}

asmlinkage notrace void trap_c(struct pt_regs *fp)
{
#ifdef CONFIG_DEBUG_BFIN_HWTRACE_ON
        int j;
#endif
#ifdef CONFIG_DEBUG_HUNT_FOR_ZERO
        unsigned int cpu = raw_smp_processor_id();
#endif
        const char *strerror = NULL;
        int sig = 0;
        siginfo_t info;
        unsigned long trapnr = fp->seqstat & SEQSTAT_EXCAUSE;

        trace_buffer_save(j);
#if defined(CONFIG_DEBUG_MMRS) || defined(CONFIG_DEBUG_MMRS_MODULE)
        last_seqstat = (u32)fp->seqstat;
#endif

        /* Important - be very careful dereferncing pointers - will lead to
         * double faults if the stack has become corrupt
         */

        /* trap_c() will be called for exceptions. During exceptions
         * processing, the pc value should be set with retx value.
         * With this change we can cleanup some code in signal.c- TODO
         */
        fp->orig_pc = fp->retx;
        /* printk("exception: 0x%x, ipend=%x, reti=%x, retx=%x\n",
                trapnr, fp->ipend, fp->pc, fp->retx); */

        /* send the appropriate signal to the user program */
        switch (trapnr) {

        /* This table works in conjuction with the one in ./mach-common/entry.S
         * Some exceptions are handled there (in assembly, in exception space)
         * Some are handled here, (in C, in interrupt space)
         * Some, like CPLB, are handled in both, where the normal path is
         * handled in assembly/exception space, and the error path is handled
         * here
         */

        /* 0x00 - Linux Syscall, getting here is an error */
        /* 0x01 - userspace gdb breakpoint, handled here */
        case VEC_EXCPT01:
                info.si_code = TRAP_ILLTRAP;
                sig = SIGTRAP;
                CHK_DEBUGGER_TRAP_MAYBE();
                /* Check if this is a breakpoint in kernel space */
                if (kernel_mode_regs(fp))
                        goto traps_done;
                else
                        break;
        /* 0x03 - User Defined, userspace stack overflow */
        case VEC_EXCPT03:
                info.si_code = SEGV_STACKFLOW;
                sig = SIGSEGV;
                strerror = KERN_NOTICE EXC_0x03(KERN_NOTICE);
                CHK_DEBUGGER_TRAP_MAYBE();
                break;
        /* 0x02 - KGDB initial connection and break signal trap */
        case VEC_EXCPT02:
#ifdef CONFIG_KGDB
                info.si_code = TRAP_ILLTRAP;
                sig = SIGTRAP;
                CHK_DEBUGGER_TRAP();
                goto traps_done;
#endif
        /* 0x04 - User Defined */
        /* 0x05 - User Defined */
        /* 0x06 - User Defined */
        /* 0x07 - User Defined */
        /* 0x08 - User Defined */
        /* 0x09 - User Defined */
        /* 0x0A - User Defined */
        /* 0x0B - User Defined */
        /* 0x0C - User Defined */
        /* 0x0D - User Defined */
        /* 0x0E - User Defined */
        /* 0x0F - User Defined */
        /* If we got here, it is most likely that someone was trying to use a
         * custom exception handler, and it is not actually installed properly
         */
        case VEC_EXCPT04 ... VEC_EXCPT15:
                info.si_code = ILL_ILLPARAOP;
                sig = SIGILL;
                strerror = KERN_NOTICE EXC_0x04(KERN_NOTICE);
                CHK_DEBUGGER_TRAP_MAYBE();
                break;
        /* 0x10 HW Single step, handled here */
        case VEC_STEP:
                info.si_code = TRAP_STEP;
                sig = SIGTRAP;
                CHK_DEBUGGER_TRAP_MAYBE();
                /* Check if this is a single step in kernel space */
                if (kernel_mode_regs(fp))
                        goto traps_done;
                else
                        break;
        /* 0x11 - Trace Buffer Full, handled here */
        case VEC_OVFLOW:
                info.si_code = TRAP_TRACEFLOW;
                sig = SIGTRAP;
                strerror = KERN_NOTICE EXC_0x11(KERN_NOTICE);
                CHK_DEBUGGER_TRAP_MAYBE();
                break;
        /* 0x12 - Reserved, Caught by default */
        /* 0x13 - Reserved, Caught by default */
        /* 0x14 - Reserved, Caught by default */
        /* 0x15 - Reserved, Caught by default */
        /* 0x16 - Reserved, Caught by default */
        /* 0x17 - Reserved, Caught by default */
        /* 0x18 - Reserved, Caught by default */
        /* 0x19 - Reserved, Caught by default */
        /* 0x1A - Reserved, Caught by default */
        /* 0x1B - Reserved, Caught by default */
        /* 0x1C - Reserved, Caught by default */
        /* 0x1D - Reserved, Caught by default */
        /* 0x1E - Reserved, Caught by default */
        /* 0x1F - Reserved, Caught by default */
        /* 0x20 - Reserved, Caught by default */
        /* 0x21 - Undefined Instruction, handled here */
        case VEC_UNDEF_I:
#ifdef CONFIG_BUG
                if (kernel_mode_regs(fp)) {
                        switch (report_bug(fp->pc, fp)) {
                        case BUG_TRAP_TYPE_NONE:
                                break;
                        case BUG_TRAP_TYPE_WARN:
                                dump_bfin_trace_buffer();
                                fp->pc += 2;
                                goto traps_done;
                        case BUG_TRAP_TYPE_BUG:
                                /* call to panic() will dump trace, and it is
                                 * off at this point, so it won't be clobbered
                                 */
                                panic("BUG()");
                        }
                }
#endif
                info.si_code = ILL_ILLOPC;
                sig = SIGILL;
                strerror = KERN_NOTICE EXC_0x21(KERN_NOTICE);
                CHK_DEBUGGER_TRAP_MAYBE();
                break;
        /* 0x22 - Illegal Instruction Combination, handled here */
        case VEC_ILGAL_I:
                info.si_code = ILL_ILLPARAOP;
                sig = SIGILL;
                strerror = KERN_NOTICE EXC_0x22(KERN_NOTICE);
                CHK_DEBUGGER_TRAP_MAYBE();
                break;
        /* 0x23 - Data CPLB protection violation, handled here */
        case VEC_CPLB_VL:
                info.si_code = ILL_CPLB_VI;
                sig = SIGSEGV;
                strerror = KERN_NOTICE EXC_0x23(KERN_NOTICE);
                CHK_DEBUGGER_TRAP_MAYBE();
                break;
        /* 0x24 - Data access misaligned, handled here */
        case VEC_MISALI_D:
                info.si_code = BUS_ADRALN;
                sig = SIGBUS;
                strerror = KERN_NOTICE EXC_0x24(KERN_NOTICE);
                CHK_DEBUGGER_TRAP_MAYBE();
                break;
        /* 0x25 - Unrecoverable Event, handled here */
        case VEC_UNCOV:
                info.si_code = ILL_ILLEXCPT;
                sig = SIGILL;
                strerror = KERN_NOTICE EXC_0x25(KERN_NOTICE);
                CHK_DEBUGGER_TRAP_MAYBE();
                break;
        /* 0x26 - Data CPLB Miss, normal case is handled in _cplb_hdr,
                error case is handled here */
        case VEC_CPLB_M:
                info.si_code = BUS_ADRALN;
                sig = SIGBUS;
                strerror = KERN_NOTICE EXC_0x26(KERN_NOTICE);
                break;
        /* 0x27 - Data CPLB Multiple Hits - Linux Trap Zero, handled here */
        case VEC_CPLB_MHIT:
                info.si_code = ILL_CPLB_MULHIT;
                sig = SIGSEGV;
#ifdef CONFIG_DEBUG_HUNT_FOR_ZERO
                if (cpu_pda[cpu].dcplb_fault_addr < FIXED_CODE_START)
                        strerror = KERN_NOTICE "NULL pointer access\n";
                else
#endif
                        strerror = KERN_NOTICE EXC_0x27(KERN_NOTICE);
                CHK_DEBUGGER_TRAP_MAYBE();
                break;
        /* 0x28 - Emulation Watchpoint, handled here */
        case VEC_WATCH:
                info.si_code = TRAP_WATCHPT;
                sig = SIGTRAP;
                pr_debug(EXC_0x28(KERN_DEBUG));
                CHK_DEBUGGER_TRAP_MAYBE();
                /* Check if this is a watchpoint in kernel space */
                if (kernel_mode_regs(fp))
                        goto traps_done;
                else
                        break;
#ifdef CONFIG_BF535
        /* 0x29 - Instruction fetch access error (535 only) */
        case VEC_ISTRU_VL:      /* ADSP-BF535 only (MH) */
                info.si_code = BUS_OPFETCH;
                sig = SIGBUS;
                strerror = KERN_NOTICE "BF535: VEC_ISTRU_VL\n";
                CHK_DEBUGGER_TRAP_MAYBE();
                break;
#else
        /* 0x29 - Reserved, Caught by default */
#endif
        /* 0x2A - Instruction fetch misaligned, handled here */
        case VEC_MISALI_I:
                info.si_code = BUS_ADRALN;
                sig = SIGBUS;
                strerror = KERN_NOTICE EXC_0x2A(KERN_NOTICE);
                CHK_DEBUGGER_TRAP_MAYBE();
                break;
        /* 0x2B - Instruction CPLB protection violation, handled here */
        case VEC_CPLB_I_VL:
                info.si_code = ILL_CPLB_VI;
                sig = SIGBUS;
                strerror = KERN_NOTICE EXC_0x2B(KERN_NOTICE);
                CHK_DEBUGGER_TRAP_MAYBE();
                break;
        /* 0x2C - Instruction CPLB miss, handled in _cplb_hdr */
        case VEC_CPLB_I_M:
                info.si_code = ILL_CPLB_MISS;
                sig = SIGBUS;
                strerror = KERN_NOTICE EXC_0x2C(KERN_NOTICE);
                break;
        /* 0x2D - Instruction CPLB Multiple Hits, handled here */
        case VEC_CPLB_I_MHIT:
                info.si_code = ILL_CPLB_MULHIT;
                sig = SIGSEGV;
#ifdef CONFIG_DEBUG_HUNT_FOR_ZERO
                if (cpu_pda[cpu].icplb_fault_addr < FIXED_CODE_START)
                        strerror = KERN_NOTICE "Jump to NULL address\n";
                else
#endif
                        strerror = KERN_NOTICE EXC_0x2D(KERN_NOTICE);
                CHK_DEBUGGER_TRAP_MAYBE();
                break;
        /* 0x2E - Illegal use of Supervisor Resource, handled here */
        case VEC_ILL_RES:
                info.si_code = ILL_PRVOPC;
                sig = SIGILL;
                strerror = KERN_NOTICE EXC_0x2E(KERN_NOTICE);
                CHK_DEBUGGER_TRAP_MAYBE();
                break;
        /* 0x2F - Reserved, Caught by default */
        /* 0x30 - Reserved, Caught by default */
        /* 0x31 - Reserved, Caught by default */
        /* 0x32 - Reserved, Caught by default */
        /* 0x33 - Reserved, Caught by default */
        /* 0x34 - Reserved, Caught by default */
        /* 0x35 - Reserved, Caught by default */
        /* 0x36 - Reserved, Caught by default */
        /* 0x37 - Reserved, Caught by default */
        /* 0x38 - Reserved, Caught by default */
        /* 0x39 - Reserved, Caught by default */
        /* 0x3A - Reserved, Caught by default */
        /* 0x3B - Reserved, Caught by default */
        /* 0x3C - Reserved, Caught by default */
        /* 0x3D - Reserved, Caught by default */
        /* 0x3E - Reserved, Caught by default */
        /* 0x3F - Reserved, Caught by default */
        case VEC_HWERR:
                info.si_code = BUS_ADRALN;
                sig = SIGBUS;
                switch (fp->seqstat & SEQSTAT_HWERRCAUSE) {
                /* System MMR Error */
                case (SEQSTAT_HWERRCAUSE_SYSTEM_MMR):
                        info.si_code = BUS_ADRALN;
                        sig = SIGBUS;
                        strerror = KERN_NOTICE HWC_x2(KERN_NOTICE);
                        break;
                /* External Memory Addressing Error */
                case (SEQSTAT_HWERRCAUSE_EXTERN_ADDR):
                        info.si_code = BUS_ADRERR;
                        sig = SIGBUS;
                        strerror = KERN_NOTICE HWC_x3(KERN_NOTICE);
                        break;
                /* Performance Monitor Overflow */
                case (SEQSTAT_HWERRCAUSE_PERF_FLOW):
                        strerror = KERN_NOTICE HWC_x12(KERN_NOTICE);
                        break;
                /* RAISE 5 instruction */
                case (SEQSTAT_HWERRCAUSE_RAISE_5):
                        printk(KERN_NOTICE HWC_x18(KERN_NOTICE));
                        break;
                default:        /* Reserved */
                        printk(KERN_NOTICE HWC_default(KERN_NOTICE));
                        break;
                }
                CHK_DEBUGGER_TRAP_MAYBE();
                break;
        /*
         * We should be handling all known exception types above,
         * if we get here we hit a reserved one, so panic
         */
        default:
                info.si_code = ILL_ILLPARAOP;
                sig = SIGILL;
                verbose_printk(KERN_EMERG "Caught Unhandled Exception, code = %08lx\n",
                        (fp->seqstat & SEQSTAT_EXCAUSE));
                CHK_DEBUGGER_TRAP_MAYBE();
                break;
        }

        BUG_ON(sig == 0);

        /* If the fault was caused by a kernel thread, or interrupt handler
         * we will kernel panic, so the system reboots.
         */
        if (kernel_mode_regs(fp) || (current && !current->mm)) {
                console_verbose();
                oops_in_progress = 1;
        }

        if (sig != SIGTRAP) {
                if (strerror)
                        verbose_printk(strerror);

                dump_bfin_process(fp);
                dump_bfin_mem(fp);
                show_regs(fp);

                /* Print out the trace buffer if it makes sense */
#ifndef CONFIG_DEBUG_BFIN_NO_KERN_HWTRACE
                if (trapnr == VEC_CPLB_I_M || trapnr == VEC_CPLB_M)
                        verbose_printk(KERN_NOTICE "No trace since you do not have "
                               "CONFIG_DEBUG_BFIN_NO_KERN_HWTRACE enabled\n\n");
                else
#endif
                        dump_bfin_trace_buffer();

                if (oops_in_progress) {
                        /* Dump the current kernel stack */
                        verbose_printk(KERN_NOTICE "Kernel Stack\n");
                        show_stack(current, NULL);
                        print_modules();
#ifndef CONFIG_ACCESS_CHECK
                        verbose_printk(KERN_EMERG "Please turn on "
                               "CONFIG_ACCESS_CHECK\n");
#endif
                        panic("Kernel exception");
                } else {
#ifdef CONFIG_DEBUG_VERBOSE
                        unsigned long *stack;
                        /* Dump the user space stack */
                        stack = (unsigned long *)rdusp();
                        verbose_printk(KERN_NOTICE "Userspace Stack\n");
                        show_stack(NULL, stack);
#endif
                }
        }

#ifdef CONFIG_IPIPE
        if (!ipipe_trap_notify(fp->seqstat & 0x3f, fp))
#endif
        {
                info.si_signo = sig;
                info.si_errno = 0;
                info.si_addr = (void __user *)fp->pc;
                force_sig_info(sig, &info, current);
        }

        if ((ANOMALY_05000461 && trapnr == VEC_HWERR && !access_ok(VERIFY_READ, fp->pc, 8)) ||
            (ANOMALY_05000281 && trapnr == VEC_HWERR) ||
            (ANOMALY_05000189 && (trapnr == VEC_CPLB_I_VL || trapnr == VEC_CPLB_VL)))
                fp->pc = SAFE_USER_INSTRUCTION;

 traps_done:
        trace_buffer_restore(j);
}

/* Typical exception handling routines  */

#define EXPAND_LEN ((1 << CONFIG_DEBUG_BFIN_HWTRACE_EXPAND_LEN) * 256 - 1)

/*
 * Similar to get_user, do some address checking, then dereference
 * Return true on sucess, false on bad address
 */
static bool get_instruction(unsigned short *val, unsigned short *address)
{
        unsigned long addr = (unsigned long)address;

        /* Check for odd addresses */
        if (addr & 0x1)
                return false;

        /* MMR region will never have instructions */
        if (addr >= SYSMMR_BASE)
                return false;

        switch (bfin_mem_access_type(addr, 2)) {
                case BFIN_MEM_ACCESS_CORE:
                case BFIN_MEM_ACCESS_CORE_ONLY:
                        *val = *address;
                        return true;
                case BFIN_MEM_ACCESS_DMA:
                        dma_memcpy(val, address, 2);
                        return true;
                case BFIN_MEM_ACCESS_ITEST:
                        isram_memcpy(val, address, 2);
                        return true;
                default: /* invalid access */
                        return false;
        }
}

/*
 * decode the instruction if we are printing out the trace, as it
 * makes things easier to follow, without running it through objdump
 * These are the normal instructions which cause change of flow, which
 * would be at the source of the trace buffer
 */
#if defined(CONFIG_DEBUG_VERBOSE) && defined(CONFIG_DEBUG_BFIN_HWTRACE_ON)
static void decode_instruction(unsigned short *address)
{
        unsigned short opcode;

        if (get_instruction(&opcode, address)) {
                if (opcode == 0x0010)
                        verbose_printk("RTS");
                else if (opcode == 0x0011)
                        verbose_printk("RTI");
                else if (opcode == 0x0012)
                        verbose_printk("RTX");
                else if (opcode == 0x0013)
                        verbose_printk("RTN");
                else if (opcode == 0x0014)
                        verbose_printk("RTE");
                else if (opcode == 0x0025)
                        verbose_printk("EMUEXCPT");
                else if (opcode == 0x0040 && opcode <= 0x0047)
                        verbose_printk("STI R%i", opcode & 7);
                else if (opcode >= 0x0050 && opcode <= 0x0057)
                        verbose_printk("JUMP (P%i)", opcode & 7);
                else if (opcode >= 0x0060 && opcode <= 0x0067)
                        verbose_printk("CALL (P%i)", opcode & 7);
                else if (opcode >= 0x0070 && opcode <= 0x0077)
                        verbose_printk("CALL (PC+P%i)", opcode & 7);
                else if (opcode >= 0x0080 && opcode <= 0x0087)
                        verbose_printk("JUMP (PC+P%i)", opcode & 7);
                else if (opcode >= 0x0090 && opcode <= 0x009F)
                        verbose_printk("RAISE 0x%x", opcode & 0xF);
                else if (opcode >= 0x00A0 && opcode <= 0x00AF)
                        verbose_printk("EXCPT 0x%x", opcode & 0xF);
                else if ((opcode >= 0x1000 && opcode <= 0x13FF) || (opcode >= 0x1800 && opcode <= 0x1BFF))
                        verbose_printk("IF !CC JUMP");
                else if ((opcode >= 0x1400 && opcode <= 0x17ff) || (opcode >= 0x1c00 && opcode <= 0x1fff))
                        verbose_printk("IF CC JUMP");
                else if (opcode >= 0x2000 && opcode <= 0x2fff)
                        verbose_printk("JUMP.S");
                else if (opcode >= 0xe080 && opcode <= 0xe0ff)
                        verbose_printk("LSETUP");
                else if (opcode >= 0xe200 && opcode <= 0xe2ff)
                        verbose_printk("JUMP.L");
                else if (opcode >= 0xe300 && opcode <= 0xe3ff)
                        verbose_printk("CALL pcrel");
                else
                        verbose_printk("0x%04x", opcode);
        }

}
#endif

void dump_bfin_trace_buffer(void)
{
#ifdef CONFIG_DEBUG_VERBOSE
#ifdef CONFIG_DEBUG_BFIN_HWTRACE_ON
        int tflags, i = 0;
        char buf[150];
        unsigned short *addr;
#ifdef CONFIG_DEBUG_BFIN_HWTRACE_EXPAND
        int j, index;
#endif

        trace_buffer_save(tflags);

        printk(KERN_NOTICE "Hardware Trace:\n");

#ifdef CONFIG_DEBUG_BFIN_HWTRACE_EXPAND
        printk(KERN_NOTICE "WARNING: Expanded trace turned on - can not trace exceptions\n");
#endif

        if (likely(bfin_read_TBUFSTAT() & TBUFCNT)) {
                for (; bfin_read_TBUFSTAT() & TBUFCNT; i++) {
                        decode_address(buf, (unsigned long)bfin_read_TBUF());
                        printk(KERN_NOTICE "%4i Target : %s\n", i, buf);
                        addr = (unsigned short *)bfin_read_TBUF();
                        decode_address(buf, (unsigned long)addr);
                        printk(KERN_NOTICE "     Source : %s ", buf);
                        decode_instruction(addr);
                        printk("\n");
                }
        }

#ifdef CONFIG_DEBUG_BFIN_HWTRACE_EXPAND
        if (trace_buff_offset)
                index = trace_buff_offset / 4;
        else
                index = EXPAND_LEN;

        j = (1 << CONFIG_DEBUG_BFIN_HWTRACE_EXPAND_LEN) * 128;
        while (j) {
                decode_address(buf, software_trace_buff[index]);
                printk(KERN_NOTICE "%4i Target : %s\n", i, buf);
                index -= 1;
                if (index < 0 )
                        index = EXPAND_LEN;
                decode_address(buf, software_trace_buff[index]);
                printk(KERN_NOTICE "     Source : %s ", buf);
                decode_instruction((unsigned short *)software_trace_buff[index]);
                printk("\n");
                index -= 1;
                if (index < 0)
                        index = EXPAND_LEN;
                j--;
                i++;
        }
#endif

        trace_buffer_restore(tflags);
#endif
#endif
}
EXPORT_SYMBOL(dump_bfin_trace_buffer);

#ifdef CONFIG_BUG
int is_valid_bugaddr(unsigned long addr)
{
        unsigned short opcode;

        if (!get_instruction(&opcode, (unsigned short *)addr))
                return 0;

        return opcode == BFIN_BUG_OPCODE;
}
#endif

/*
 * Checks to see if the address pointed to is either a
 * 16-bit CALL instruction, or a 32-bit CALL instruction
 */
static bool is_bfin_call(unsigned short *addr)
{
        unsigned short opcode = 0, *ins_addr;
        ins_addr = (unsigned short *)addr;

        if (!get_instruction(&opcode, ins_addr))
                return false;

        if ((opcode >= 0x0060 && opcode <= 0x0067) ||
            (opcode >= 0x0070 && opcode <= 0x0077))
                return true;

        ins_addr--;
        if (!get_instruction(&opcode, ins_addr))
                return false;

        if (opcode >= 0xE300 && opcode <= 0xE3FF)
                return true;

        return false;

}

void show_stack(struct task_struct *task, unsigned long *stack)
{
#ifdef CONFIG_PRINTK
        unsigned int *addr, *endstack, *fp = 0, *frame;
        unsigned short *ins_addr;
        char buf[150];
        unsigned int i, j, ret_addr, frame_no = 0;

        /*
         * If we have been passed a specific stack, use that one otherwise
         *    if we have been passed a task structure, use that, otherwise
         *    use the stack of where the variable "stack" exists
         */

        if (stack == NULL) {
                if (task) {
                        /* We know this is a kernel stack, so this is the start/end */
                        stack = (unsigned long *)task->thread.ksp;
                        endstack = (unsigned int *)(((unsigned int)(stack) & ~(THREAD_SIZE - 1)) + THREAD_SIZE);
                } else {
                        /* print out the existing stack info */
                        stack = (unsigned long *)&stack;
                        endstack = (unsigned int *)PAGE_ALIGN((unsigned int)stack);
                }
        } else
                endstack = (unsigned int *)PAGE_ALIGN((unsigned int)stack);

        printk(KERN_NOTICE "Stack info:\n");
        decode_address(buf, (unsigned int)stack);
        printk(KERN_NOTICE " SP: [0x%p] %s\n", stack, buf);

        if (!access_ok(VERIFY_READ, stack, (unsigned int)endstack - (unsigned int)stack)) {
                printk(KERN_NOTICE "Invalid stack pointer\n");
                return;
        }

        /* First thing is to look for a frame pointer */
        for (addr = (unsigned int *)((unsigned int)stack & ~0xF); addr < endstack; addr++) {
                if (*addr & 0x1)
                        continue;
                ins_addr = (unsigned short *)*addr;
                ins_addr--;
                if (is_bfin_call(ins_addr))
                        fp = addr - 1;

                if (fp) {
                        /* Let's check to see if it is a frame pointer */
                        while (fp >= (addr - 1) && fp < endstack
                               && fp && ((unsigned int) fp & 0x3) == 0)
                                fp = (unsigned int *)*fp;
                        if (fp == 0 || fp == endstack) {
                                fp = addr - 1;
                                break;
                        }
                        fp = 0;
                }
        }
        if (fp) {
                frame = fp;
                printk(KERN_NOTICE " FP: (0x%p)\n", fp);
        } else
                frame = 0;

        /*
         * Now that we think we know where things are, we
         * walk the stack again, this time printing things out
         * incase there is no frame pointer, we still look for
         * valid return addresses
         */

        /* First time print out data, next time, print out symbols */
        for (j = 0; j <= 1; j++) {
                if (j)
                        printk(KERN_NOTICE "Return addresses in stack:\n");
                else
                        printk(KERN_NOTICE " Memory from 0x%08lx to %p", ((long unsigned int)stack & ~0xF), endstack);

                fp = frame;
                frame_no = 0;

                for (addr = (unsigned int *)((unsigned int)stack & ~0xF), i = 0;
                     addr < endstack; addr++, i++) {

                        ret_addr = 0;
                        if (!j && i % 8 == 0)
                                printk(KERN_NOTICE "%p:",addr);

                        /* if it is an odd address, or zero, just skip it */
                        if (*addr & 0x1 || !*addr)
                                goto print;

                        ins_addr = (unsigned short *)*addr;

                        /* Go back one instruction, and see if it is a CALL */
                        ins_addr--;
                        ret_addr = is_bfin_call(ins_addr);
 print:
                        if (!j && stack == (unsigned long *)addr)
                                printk("[%08x]", *addr);
                        else if (ret_addr)
                                if (j) {
                                        decode_address(buf, (unsigned int)*addr);
                                        if (frame == addr) {
                                                printk(KERN_NOTICE "   frame %2i : %s\n", frame_no, buf);
                                                continue;
                                        }
                                        printk(KERN_NOTICE "    address : %s\n", buf);
                                } else
                                        printk("<%08x>", *addr);
                        else if (fp == addr) {
                                if (j)
                                        frame = addr+1;
                                else
                                        printk("(%08x)", *addr);

                                fp = (unsigned int *)*addr;
                                frame_no++;

                        } else if (!j)
                                printk(" %08x ", *addr);
                }
                if (!j)
                        printk("\n");
        }
#endif
}
EXPORT_SYMBOL(show_stack);

void dump_stack(void)
{
        unsigned long stack;
#ifdef CONFIG_DEBUG_BFIN_HWTRACE_ON
        int tflags;
#endif
        trace_buffer_save(tflags);
        dump_bfin_trace_buffer();
        show_stack(current, &stack);
        trace_buffer_restore(tflags);
}
EXPORT_SYMBOL(dump_stack);

void dump_bfin_process(struct pt_regs *fp)
{
#ifdef CONFIG_DEBUG_VERBOSE
        /* We should be able to look at fp->ipend, but we don't push it on the
         * stack all the time, so do this until we fix that */
        unsigned int context = bfin_read_IPEND();

        if (oops_in_progress)
                verbose_printk(KERN_EMERG "Kernel OOPS in progress\n");

        if (context & 0x0020 && (fp->seqstat & SEQSTAT_EXCAUSE) == VEC_HWERR)
                verbose_printk(KERN_NOTICE "HW Error context\n");
        else if (context & 0x0020)
                verbose_printk(KERN_NOTICE "Deferred Exception context\n");
        else if (context & 0x3FC0)
                verbose_printk(KERN_NOTICE "Interrupt context\n");
        else if (context & 0x4000)
                verbose_printk(KERN_NOTICE "Deferred Interrupt context\n");
        else if (context & 0x8000)
                verbose_printk(KERN_NOTICE "Kernel process context\n");

        /* Because we are crashing, and pointers could be bad, we check things
         * pretty closely before we use them
         */
        if ((unsigned long)current >= FIXED_CODE_START &&
            !((unsigned long)current & 0x3) && current->pid) {
                verbose_printk(KERN_NOTICE "CURRENT PROCESS:\n");
                if (current->comm >= (char *)FIXED_CODE_START)
                        verbose_printk(KERN_NOTICE "COMM=%s PID=%d\n",
                                current->comm, current->pid);
                else
                        verbose_printk(KERN_NOTICE "COMM= invalid\n");

                printk(KERN_NOTICE "CPU = %d\n", current_thread_info()->cpu);
                if (!((unsigned long)current->mm & 0x3) && (unsigned long)current->mm >= FIXED_CODE_START)
                        verbose_printk(KERN_NOTICE
                                "TEXT = 0x%p-0x%p        DATA = 0x%p-0x%p\n"
                                " BSS = 0x%p-0x%p  USER-STACK = 0x%p\n\n",
                                (void *)current->mm->start_code,
                                (void *)current->mm->end_code,
                                (void *)current->mm->start_data,
                                (void *)current->mm->end_data,
                                (void *)current->mm->end_data,
                                (void *)current->mm->brk,
                                (void *)current->mm->start_stack);
                else
                        verbose_printk(KERN_NOTICE "invalid mm\n");
        } else
                verbose_printk(KERN_NOTICE
                               "No Valid process in current context\n");

#endif
}

void dump_bfin_mem(struct pt_regs *fp)
{
#ifdef CONFIG_DEBUG_VERBOSE
        unsigned short *addr, *erraddr, val = 0, err = 0;
        char sti = 0, buf[6];

        erraddr = (void *)fp->pc;

        verbose_printk(KERN_NOTICE "return address: [0x%p]; contents of:", erraddr);

        for (addr = (unsigned short *)((unsigned long)erraddr & ~0xF) - 0x10;
             addr < (unsigned short *)((unsigned long)erraddr & ~0xF) + 0x10;
             addr++) {
                if (!((unsigned long)addr & 0xF))
                        verbose_printk(KERN_NOTICE "0x%p: ", addr);

                if (!get_instruction(&val, addr)) {
                                val = 0;
                                sprintf(buf, "????");
                } else
                        sprintf(buf, "%04x", val);

                if (addr == erraddr) {
                        verbose_printk("[%s]", buf);
                        err = val;
                } else
                        verbose_printk(" %s ", buf);

                /* Do any previous instructions turn on interrupts? */
                if (addr <= erraddr &&                          /* in the past */
                    ((val >= 0x0040 && val <= 0x0047) ||        /* STI instruction */
                      val == 0x017b))                           /* [SP++] = RETI */
                        sti = 1;
        }

        verbose_printk("\n");

        /* Hardware error interrupts can be deferred */
        if (unlikely(sti && (fp->seqstat & SEQSTAT_EXCAUSE) == VEC_HWERR &&
            oops_in_progress)){
                verbose_printk(KERN_NOTICE "Looks like this was a deferred error - sorry\n");
#ifndef CONFIG_DEBUG_HWERR
                verbose_printk(KERN_NOTICE
"The remaining message may be meaningless\n"
"You should enable CONFIG_DEBUG_HWERR to get a better idea where it came from\n");
#else
                /* If we are handling only one peripheral interrupt
                 * and current mm and pid are valid, and the last error
                 * was in that user space process's text area
                 * print it out - because that is where the problem exists
                 */
                if ((!(((fp)->ipend & ~0x30) & (((fp)->ipend & ~0x30) - 1))) &&
                     (current->pid && current->mm)) {
                        /* And the last RETI points to the current userspace context */
                        if ((fp + 1)->pc >= current->mm->start_code &&
                            (fp + 1)->pc <= current->mm->end_code) {
                                verbose_printk(KERN_NOTICE "It might be better to look around here : \n");
                                verbose_printk(KERN_NOTICE "-------------------------------------------\n");
                                show_regs(fp + 1);
                                verbose_printk(KERN_NOTICE "-------------------------------------------\n");
                        }
                }
#endif
        }
#endif
}

void show_regs(struct pt_regs *fp)
{
#ifdef CONFIG_DEBUG_VERBOSE
        char buf [150];
        struct irqaction *action;
        unsigned int i;
        unsigned long flags = 0;
        unsigned int cpu = raw_smp_processor_id();
        unsigned char in_atomic = (bfin_read_IPEND() & 0x10) || in_atomic();

        verbose_printk(KERN_NOTICE "\n");
        if (CPUID != bfin_cpuid())
                verbose_printk(KERN_NOTICE "Compiled for cpu family 0x%04x (Rev %d), "
                        "but running on:0x%04x (Rev %d)\n",
                        CPUID, bfin_compiled_revid(), bfin_cpuid(), bfin_revid());

        verbose_printk(KERN_NOTICE "ADSP-%s-0.%d",
                CPU, bfin_compiled_revid());

        if (bfin_compiled_revid() !=  bfin_revid())
                verbose_printk("(Detected 0.%d)", bfin_revid());

        verbose_printk(" %lu(MHz CCLK) %lu(MHz SCLK) (%s)\n",
                get_cclk()/1000000, get_sclk()/1000000,
#ifdef CONFIG_MPU
                "mpu on"
#else
                "mpu off"
#endif
                );

        verbose_printk(KERN_NOTICE "%s", linux_banner);

        verbose_printk(KERN_NOTICE "\nSEQUENCER STATUS:\t\t%s\n", print_tainted());
        verbose_printk(KERN_NOTICE " SEQSTAT: %08lx  IPEND: %04lx  IMASK: %04lx  SYSCFG: %04lx\n",
                (long)fp->seqstat, fp->ipend, cpu_pda[raw_smp_processor_id()].ex_imask, fp->syscfg);
        if (fp->ipend & EVT_IRPTEN)
                verbose_printk(KERN_NOTICE "  Global Interrupts Disabled (IPEND[4])\n");
        if (!(cpu_pda[raw_smp_processor_id()].ex_imask & (EVT_IVG13 | EVT_IVG12 | EVT_IVG11 |
                        EVT_IVG10 | EVT_IVG9 | EVT_IVG8 | EVT_IVG7 | EVT_IVTMR)))
                verbose_printk(KERN_NOTICE "  Peripheral interrupts masked off\n");
        if (!(cpu_pda[raw_smp_processor_id()].ex_imask & (EVT_IVG15 | EVT_IVG14)))
                verbose_printk(KERN_NOTICE "  Kernel interrupts masked off\n");
        if ((fp->seqstat & SEQSTAT_EXCAUSE) == VEC_HWERR) {
                verbose_printk(KERN_NOTICE "  HWERRCAUSE: 0x%lx\n",
                        (fp->seqstat & SEQSTAT_HWERRCAUSE) >> 14);
#ifdef EBIU_ERRMST
                /* If the error was from the EBIU, print it out */
                if (bfin_read_EBIU_ERRMST() & CORE_ERROR) {
                        verbose_printk(KERN_NOTICE "  EBIU Error Reason  : 0x%04x\n",
                                bfin_read_EBIU_ERRMST());
                        verbose_printk(KERN_NOTICE "  EBIU Error Address : 0x%08x\n",
                                bfin_read_EBIU_ERRADD());
                }
#endif
        }
        verbose_printk(KERN_NOTICE "  EXCAUSE   : 0x%lx\n",
                fp->seqstat & SEQSTAT_EXCAUSE);
        for (i = 2; i <= 15 ; i++) {
                if (fp->ipend & (1 << i)) {
                        if (i != 4) {
                                decode_address(buf, bfin_read32(EVT0 + 4*i));
                                verbose_printk(KERN_NOTICE "  physical IVG%i asserted : %s\n", i, buf);
                        } else
                                verbose_printk(KERN_NOTICE "  interrupts disabled\n");
                }
        }

        /* if no interrupts are going off, don't print this out */
        if (fp->ipend & ~0x3F) {
                for (i = 0; i < (NR_IRQS - 1); i++) {
                        if (!in_atomic)
                                spin_lock_irqsave(&irq_desc[i].lock, flags);

                        action = irq_desc[i].action;
                        if (!action)
                                goto unlock;

                        decode_address(buf, (unsigned int)action->handler);
                        verbose_printk(KERN_NOTICE "  logical irq %3d mapped  : %s", i, buf);
                        for (action = action->next; action; action = action->next) {
                                decode_address(buf, (unsigned int)action->handler);
                                verbose_printk(", %s", buf);
                        }
                        verbose_printk("\n");
unlock:
                        if (!in_atomic)
                                spin_unlock_irqrestore(&irq_desc[i].lock, flags);
                }
        }

        decode_address(buf, fp->rete);
        verbose_printk(KERN_NOTICE " RETE: %s\n", buf);
        decode_address(buf, fp->retn);
        verbose_printk(KERN_NOTICE " RETN: %s\n", buf);
        decode_address(buf, fp->retx);
        verbose_printk(KERN_NOTICE " RETX: %s\n", buf);
        decode_address(buf, fp->rets);
        verbose_printk(KERN_NOTICE " RETS: %s\n", buf);
        decode_address(buf, fp->pc);
        verbose_printk(KERN_NOTICE " PC  : %s\n", buf);

        if (((long)fp->seqstat &  SEQSTAT_EXCAUSE) &&
            (((long)fp->seqstat & SEQSTAT_EXCAUSE) != VEC_HWERR)) {
                decode_address(buf, cpu_pda[cpu].dcplb_fault_addr);
                verbose_printk(KERN_NOTICE "DCPLB_FAULT_ADDR: %s\n", buf);
                decode_address(buf, cpu_pda[cpu].icplb_fault_addr);
                verbose_printk(KERN_NOTICE "ICPLB_FAULT_ADDR: %s\n", buf);
        }

        verbose_printk(KERN_NOTICE "PROCESSOR STATE:\n");
        verbose_printk(KERN_NOTICE " R0 : %08lx    R1 : %08lx    R2 : %08lx    R3 : %08lx\n",
                fp->r0, fp->r1, fp->r2, fp->r3);
        verbose_printk(KERN_NOTICE " R4 : %08lx    R5 : %08lx    R6 : %08lx    R7 : %08lx\n",
                fp->r4, fp->r5, fp->r6, fp->r7);
        verbose_printk(KERN_NOTICE " P0 : %08lx    P1 : %08lx    P2 : %08lx    P3 : %08lx\n",
                fp->p0, fp->p1, fp->p2, fp->p3);
        verbose_printk(KERN_NOTICE " P4 : %08lx    P5 : %08lx    FP : %08lx    SP : %08lx\n",
                fp->p4, fp->p5, fp->fp, (long)fp);
        verbose_printk(KERN_NOTICE " LB0: %08lx    LT0: %08lx    LC0: %08lx\n",
                fp->lb0, fp->lt0, fp->lc0);
        verbose_printk(KERN_NOTICE " LB1: %08lx    LT1: %08lx    LC1: %08lx\n",
                fp->lb1, fp->lt1, fp->lc1);
        verbose_printk(KERN_NOTICE " B0 : %08lx    L0 : %08lx    M0 : %08lx    I0 : %08lx\n",
                fp->b0, fp->l0, fp->m0, fp->i0);
        verbose_printk(KERN_NOTICE " B1 : %08lx    L1 : %08lx    M1 : %08lx    I1 : %08lx\n",
                fp->b1, fp->l1, fp->m1, fp->i1);
        verbose_printk(KERN_NOTICE " B2 : %08lx    L2 : %08lx    M2 : %08lx    I2 : %08lx\n",
                fp->b2, fp->l2, fp->m2, fp->i2);
        verbose_printk(KERN_NOTICE " B3 : %08lx    L3 : %08lx    M3 : %08lx    I3 : %08lx\n",
                fp->b3, fp->l3, fp->m3, fp->i3);
        verbose_printk(KERN_NOTICE "A0.w: %08lx   A0.x: %08lx   A1.w: %08lx   A1.x: %08lx\n",
                fp->a0w, fp->a0x, fp->a1w, fp->a1x);

        verbose_printk(KERN_NOTICE "USP : %08lx  ASTAT: %08lx\n",
                rdusp(), fp->astat);

        verbose_printk(KERN_NOTICE "\n");
#endif
}

#ifdef CONFIG_SYS_BFIN_SPINLOCK_L1
asmlinkage int sys_bfin_spinlock(int *spinlock)__attribute__((l1_text));
#endif

static DEFINE_SPINLOCK(bfin_spinlock_lock);

asmlinkage int sys_bfin_spinlock(int *p)
{
        int ret, tmp = 0;

        spin_lock(&bfin_spinlock_lock); /* This would also hold kernel preemption. */
        ret = get_user(tmp, p);
        if (likely(ret == 0)) {
                if (unlikely(tmp))
                        ret = 1;
                else
                        put_user(1, p);
        }
        spin_unlock(&bfin_spinlock_lock);
        return ret;
}

int bfin_request_exception(unsigned int exception, void (*handler)(void))
{
        void (*curr_handler)(void);

        if (exception > 0x3F)
                return -EINVAL;

        curr_handler = ex_table[exception];

        if (curr_handler != ex_replaceable)
                return -EBUSY;

        ex_table[exception] = handler;

        return 0;
}
EXPORT_SYMBOL(bfin_request_exception);

int bfin_free_exception(unsigned int exception, void (*handler)(void))
{
        void (*curr_handler)(void);

        if (exception > 0x3F)
                return -EINVAL;

        curr_handler = ex_table[exception];

        if (curr_handler != handler)
                return -EBUSY;

        ex_table[exception] = ex_replaceable;

        return 0;
}
EXPORT_SYMBOL(bfin_free_exception);

void panic_cplb_error(int cplb_panic, struct pt_regs *fp)
{
        switch (cplb_panic) {
        case CPLB_NO_UNLOCKED:
                printk(KERN_EMERG "All CPLBs are locked\n");
                break;
        case CPLB_PROT_VIOL:
                return;
        case CPLB_NO_ADDR_MATCH:
                return;
        case CPLB_UNKNOWN_ERR:
                printk(KERN_EMERG "Unknown CPLB Exception\n");
                break;
        }

        oops_in_progress = 1;

        dump_bfin_process(fp);
        dump_bfin_mem(fp);
        show_regs(fp);
        dump_stack();
        panic("Unrecoverable event");
}