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

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