LXR linux/arch/cris/arch-v32/kernel/traps.c

   1/*
   2 * Copyright (C) 2003, Axis Communications AB.
   3 */
   4
   5#include <linux/ptrace.h>
   6#include <asm/uaccess.h>
   7
   8#include <asm/arch/hwregs/supp_reg.h>
   9
  10extern void reset_watchdog(void);
  11extern void stop_watchdog(void);
  12
  13extern int raw_printk(const char *fmt, ...);
  14
  15void
  16show_registers(struct pt_regs *regs)
  17{
  18        /*
  19         * It's possible to use either the USP register or current->thread.usp.
  20         * USP might not correspond to the current proccess for all cases this
  21         * function is called, and current->thread.usp isn't up to date for the
  22         * current proccess. Experience shows that using USP is the way to go.
  23         */
  24        unsigned long usp;
  25        unsigned long d_mmu_cause;
  26        unsigned long i_mmu_cause;
  27
  28        usp = rdusp();
  29
  30        raw_printk("CPU: %d\n", smp_processor_id());
  31
  32        raw_printk("ERP: %08lx SRP: %08lx  CCS: %08lx USP: %08lx MOF: %08lx\n",
  33                regs->erp, regs->srp, regs->ccs, usp, regs->mof);
  34
  35        raw_printk(" r0: %08lx  r1: %08lx   r2: %08lx  r3: %08lx\n",
  36                regs->r0, regs->r1, regs->r2, regs->r3);
  37
  38        raw_printk(" r4: %08lx  r5: %08lx   r6: %08lx  r7: %08lx\n",
  39                regs->r4, regs->r5, regs->r6, regs->r7);
  40
  41        raw_printk(" r8: %08lx  r9: %08lx  r10: %08lx r11: %08lx\n",
  42                regs->r8, regs->r9, regs->r10, regs->r11);
  43
  44        raw_printk("r12: %08lx r13: %08lx oR10: %08lx acr: %08lx\n",
  45                regs->r12, regs->r13, regs->orig_r10, regs->acr);
  46
  47        raw_printk("sp: %08lx\n", regs);
  48
  49        SUPP_BANK_SEL(BANK_IM);
  50        SUPP_REG_RD(RW_MM_CAUSE, i_mmu_cause);
  51
  52        SUPP_BANK_SEL(BANK_DM);
  53        SUPP_REG_RD(RW_MM_CAUSE, d_mmu_cause);
  54
  55        raw_printk("       Data MMU Cause: %08lx\n", d_mmu_cause);
  56        raw_printk("Instruction MMU Cause: %08lx\n", i_mmu_cause);
  57
  58        raw_printk("Process %s (pid: %d, stackpage: %08lx)\n",
  59                current->comm, current->pid, (unsigned long) current);
  60
  61        /* Show additional info if in kernel-mode. */
  62        if (!user_mode(regs)) {
  63                int i;
  64                unsigned char c;
  65
  66                show_stack(NULL, (unsigned long *) usp);
  67
  68                /*
  69                 * If the previous stack-dump wasn't a kernel one, dump the
  70                 * kernel stack now.
  71                 */
  72                if (usp != 0)
  73                        show_stack(NULL, NULL);
  74
  75                raw_printk("\nCode: ");
  76
  77                if (regs->erp < PAGE_OFFSET)
  78                        goto bad_value;
  79
  80                /*
  81                 * Quite often the value at regs->erp doesn't point to the
  82                 * interesting instruction, which often is the previous
  83                 * instruction. So dump at an offset large enough that the
  84                 * instruction decoding should be in sync at the interesting
  85                 * point, but small enough to fit on a row. The regs->erp
  86                 * location is pointed out in a ksymoops-friendly way by
  87                 * wrapping the byte for that address in parenthesis.
  88                 */
  89                for (i = -12; i < 12; i++) {
  90                        if (__get_user(c, &((unsigned char *) regs->erp)[i])) {
  91bad_value:
  92                                raw_printk(" Bad IP value.");
  93                                break;
  94                        }
  95
  96                        if (i == 0)
  97                                raw_printk("(%02x) ", c);
  98                        else
  99                                raw_printk("%02x ", c);
 100                }
 101
 102                raw_printk("\n");
 103        }
 104}
 105
 106/*
 107 * This gets called from entry.S when the watchdog has bitten. Show something
 108 * similiar to an Oops dump, and if the kernel if configured to be a nice doggy;
 109 * halt instead of reboot.
 110 */
 111void
 112watchdog_bite_hook(struct pt_regs *regs)
 113{
 114#ifdef CONFIG_ETRAX_WATCHDOG_NICE_DOGGY
 115        local_irq_disable();
 116        stop_watchdog();
 117        show_registers(regs);
 118
 119        while (1)
 120                ; /* Do nothing. */
 121#else
 122        show_registers(regs);
 123#endif
 124}
 125
 126/* This is normally the Oops function. */
 127void
 128die_if_kernel(const char *str, struct pt_regs *regs, long err)
 129{
 130        if (user_mode(regs))
 131                return;
 132
 133#ifdef CONFIG_ETRAX_WATCHDOG_NICE_DOGGY
 134        /*
 135         * This printout might take too long and could trigger
 136         * the watchdog normally. If NICE_DOGGY is set, simply
 137         * stop the watchdog during the printout.
 138         */
 139        stop_watchdog();
 140#endif
 141
 142        raw_printk("%s: %04lx\n", str, err & 0xffff);
 143
 144        show_registers(regs);
 145
 146#ifdef CONFIG_ETRAX_WATCHDOG_NICE_DOGGY
 147        reset_watchdog();
 148#endif
 149
 150        do_exit(SIGSEGV);
 151}
 152
 153void arch_enable_nmi(void)
 154{
 155        unsigned long flags;
 156        local_save_flags(flags);
 157        flags |= (1<<30); /* NMI M flag is at bit 30 */
 158        local_irq_restore(flags);
 159}
 160