linux/arch/cris/arch-v32/kernel/traps.c
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   1/*
   2 * Copyright (C) 2003-2006, Axis Communications AB.
   3 */
   4
   5#include <linux/ptrace.h>
   6#include <linux/module.h>
   7#include <asm/uaccess.h>
   8#include <hwregs/supp_reg.h>
   9#include <hwregs/intr_vect_defs.h>
  10#include <asm/irq.h>
  11
  12void
  13show_registers(struct pt_regs *regs)
  14{
  15        /*
  16         * It's possible to use either the USP register or current->thread.usp.
  17         * USP might not correspond to the current process for all cases this
  18         * function is called, and current->thread.usp isn't up to date for the
  19         * current process. Experience shows that using USP is the way to go.
  20         */
  21        unsigned long usp = rdusp();
  22        unsigned long d_mmu_cause;
  23        unsigned long i_mmu_cause;
  24
  25        printk("CPU: %d\n", smp_processor_id());
  26
  27        printk("ERP: %08lx SRP: %08lx  CCS: %08lx USP: %08lx MOF: %08lx\n",
  28               regs->erp, regs->srp, regs->ccs, usp, regs->mof);
  29
  30        printk(" r0: %08lx  r1: %08lx   r2: %08lx  r3: %08lx\n",
  31               regs->r0, regs->r1, regs->r2, regs->r3);
  32
  33        printk(" r4: %08lx  r5: %08lx   r6: %08lx  r7: %08lx\n",
  34               regs->r4, regs->r5, regs->r6, regs->r7);
  35
  36        printk(" r8: %08lx  r9: %08lx  r10: %08lx r11: %08lx\n",
  37               regs->r8, regs->r9, regs->r10, regs->r11);
  38
  39        printk("r12: %08lx r13: %08lx oR10: %08lx acr: %08lx\n",
  40               regs->r12, regs->r13, regs->orig_r10, regs->acr);
  41
  42        printk(" sp: %08lx\n", (unsigned long)regs);
  43
  44        SUPP_BANK_SEL(BANK_IM);
  45        SUPP_REG_RD(RW_MM_CAUSE, i_mmu_cause);
  46
  47        SUPP_BANK_SEL(BANK_DM);
  48        SUPP_REG_RD(RW_MM_CAUSE, d_mmu_cause);
  49
  50        printk("       Data MMU Cause: %08lx\n", d_mmu_cause);
  51        printk("Instruction MMU Cause: %08lx\n", i_mmu_cause);
  52
  53        printk("Process %s (pid: %d, stackpage=%08lx)\n",
  54               current->comm, current->pid, (unsigned long)current);
  55
  56        /*
  57         * When in-kernel, we also print out the stack and code at the
  58         * time of the fault..
  59         */
  60        if (!user_mode(regs)) {
  61                int i;
  62
  63                show_stack(NULL, (unsigned long *)usp);
  64
  65                /*
  66                 * If the previous stack-dump wasn't a kernel one, dump the
  67                 * kernel stack now.
  68                 */
  69                if (usp != 0)
  70                        show_stack(NULL, NULL);
  71
  72                printk("\nCode: ");
  73
  74                if (regs->erp < PAGE_OFFSET)
  75                        goto bad_value;
  76
  77                /*
  78                 * Quite often the value at regs->erp doesn't point to the
  79                 * interesting instruction, which often is the previous
  80                 * instruction. So dump at an offset large enough that the
  81                 * instruction decoding should be in sync at the interesting
  82                 * point, but small enough to fit on a row. The regs->erp
  83                 * location is pointed out in a ksymoops-friendly way by
  84                 * wrapping the byte for that address in parenthesises.
  85                 */
  86                for (i = -12; i < 12; i++) {
  87                        unsigned char c;
  88
  89                        if (__get_user(c, &((unsigned char *)regs->erp)[i])) {
  90bad_value:
  91                                printk(" Bad IP value.");
  92                                break;
  93                        }
  94
  95                        if (i == 0)
  96                                printk("(%02x) ", c);
  97                        else
  98                                printk("%02x ", c);
  99                }
 100                printk("\n");
 101        }
 102}
 103
 104void
 105arch_enable_nmi(void)
 106{
 107        unsigned long flags;
 108
 109        local_save_flags(flags);
 110        flags |= (1 << 30); /* NMI M flag is at bit 30 */
 111        local_irq_restore(flags);
 112}
 113
 114extern void (*nmi_handler)(struct pt_regs *);
 115void handle_nmi(struct pt_regs *regs)
 116{
 117#ifdef CONFIG_ETRAXFS
 118        reg_intr_vect_r_nmi r;
 119#endif
 120
 121        if (nmi_handler)
 122                nmi_handler(regs);
 123
 124#ifdef CONFIG_ETRAXFS
 125        /* Wait until nmi is no longer active. */
 126        do {
 127                r = REG_RD(intr_vect, regi_irq, r_nmi);
 128        } while (r.ext == regk_intr_vect_on);
 129#endif
 130}
 131
 132
 133#ifdef CONFIG_BUG
 134extern void die_if_kernel(const char *str, struct pt_regs *regs, long err);
 135
 136/* Copy of the regs at BUG() time.  */
 137struct pt_regs BUG_regs;
 138
 139void do_BUG(char *file, unsigned int line)
 140{
 141        printk("kernel BUG at %s:%d!\n", file, line);
 142        die_if_kernel("Oops", &BUG_regs, 0);
 143}
 144EXPORT_SYMBOL(do_BUG);
 145
 146void fixup_BUG(struct pt_regs *regs)
 147{
 148        BUG_regs = *regs;
 149
 150#ifdef CONFIG_DEBUG_BUGVERBOSE
 151        /*
 152         * Fixup the BUG arguments through exception handlers.
 153         */
 154        {
 155                const struct exception_table_entry *fixup;
 156
 157                /*
 158                 * ERP points at the "break 14" + 2, compensate for the 2
 159                 * bytes.
 160                 */
 161                fixup = search_exception_tables(instruction_pointer(regs) - 2);
 162                if (fixup) {
 163                        /* Adjust the instruction pointer in the stackframe. */
 164                        instruction_pointer(regs) = fixup->fixup;
 165                        arch_fixup(regs);
 166                }
 167        }
 168#else
 169        /* Dont try to lookup the filename + line, just dump regs.  */
 170        do_BUG("unknown", 0);
 171#endif
 172}
 173
 174/*
 175 * Break 14 handler. Save regs and jump into the fixup_BUG.
 176 */
 177__asm__  ( ".text\n\t"
 178           ".global breakh_BUG\n\t"
 179           "breakh_BUG:\n\t"
 180           SAVE_ALL
 181           KGDB_FIXUP
 182           "move.d $sp, $r10\n\t"
 183           "jsr fixup_BUG\n\t"
 184           "nop\n\t"
 185           "jump ret_from_intr\n\t"
 186           "nop\n\t");
 187
 188
 189#ifdef CONFIG_DEBUG_BUGVERBOSE
 190void
 191handle_BUG(struct pt_regs *regs)
 192{
 193}
 194#endif
 195#endif
 196