arch/cris/arch-v10/kernel/traps.c

   1 /* $Id: traps.c,v 1.4 2005/04/24 18:47:55 starvik Exp $
   2  *
   3  *  linux/arch/cris/arch-v10/traps.c
   4  *
   5  *  Heler functions for trap handlers
   6  *
   7  *  Copyright (C) 2000-2002 Axis Communications AB
   8  *
   9  *  Authors:   Bjorn Wesen
  10  *             Hans-Peter Nilsson
  11  *
  12  */
  13
  14 #include <linux/config.h>
  15 #include <linux/ptrace.h>
  16 #include <asm/uaccess.h>
  17 #include <asm/arch/sv_addr_ag.h>
  18
  19 extern int raw_printk(const char *fmt, ...);
  20
  21 void
  22 show_registers(struct pt_regs * regs)
  23 {
  24         /* We either use rdusp() - the USP register, which might not
  25            correspond to the current process for all cases we're called,
  26            or we use the current->thread.usp, which is not up to date for
  27            the current process.  Experience shows we want the USP
  28            register.  */
  29         unsigned long usp = rdusp();
  30
  31         raw_printk("IRP: %08lx SRP: %08lx DCCR: %08lx USP: %08lx MOF: %08lx\n",
  32                regs->irp, regs->srp, regs->dccr, usp, regs->mof );
  33         raw_printk(" r0: %08lx  r1: %08lx   r2: %08lx  r3: %08lx\n",
  34                regs->r0, regs->r1, regs->r2, regs->r3);
  35         raw_printk(" r4: %08lx  r5: %08lx   r6: %08lx  r7: %08lx\n",
  36                regs->r4, regs->r5, regs->r6, regs->r7);
  37         raw_printk(" r8: %08lx  r9: %08lx  r10: %08lx r11: %08lx\n",
  38                regs->r8, regs->r9, regs->r10, regs->r11);
  39         raw_printk("r12: %08lx r13: %08lx oR10: %08lx  sp: %08lx\n",
  40                regs->r12, regs->r13, regs->orig_r10, regs);
  41         raw_printk("R_MMU_CAUSE: %08lx\n", (unsigned long)*R_MMU_CAUSE);
  42         raw_printk("Process %s (pid: %d, stackpage=%08lx)\n",
  43                current->comm, current->pid, (unsigned long)current);
  44
  45         /*
  46          * When in-kernel, we also print out the stack and code at the
  47          * time of the fault..
  48          */
  49         if (! user_mode(regs)) {
  50                 int i;
  51
  52                 show_stack(NULL, (unsigned long*)usp);
  53
  54                 /* Dump kernel stack if the previous dump wasn't one.  */
  55                 if (usp != 0)
  56                         show_stack (NULL, NULL);
  57
  58                 raw_printk("\nCode: ");
  59                 if(regs->irp < PAGE_OFFSET)
  60                         goto bad;
  61
  62                 /* Often enough the value at regs->irp does not point to
  63                    the interesting instruction, which is most often the
  64                    _previous_ instruction.  So we dump at an offset large
  65                    enough that instruction decoding should be in sync at
  66                    the interesting point, but small enough to fit on a row
  67                    (sort of).  We point out the regs->irp location in a
  68                    ksymoops-friendly way by wrapping the byte for that
  69                    address in parentheses.  */
  70                 for(i = -12; i < 12; i++)
  71                 {
  72                         unsigned char c;
  73                         if(__get_user(c, &((unsigned char*)regs->irp)[i])) {
  74 bad:
  75                                 raw_printk(" Bad IP value.");
  76                                 break;
  77                         }
  78
  79                         if (i == 0)
  80                           raw_printk("(%02x) ", c);
  81                         else
  82                           raw_printk("%02x ", c);
  83                 }
  84                 raw_printk("\n");
  85         }
  86 }
  87
  88 /* Called from entry.S when the watchdog has bitten
  89  * We print out something resembling an oops dump, and if
  90  * we have the nice doggy development flag set, we halt here
  91  * instead of rebooting.
  92  */
  93
  94 extern void reset_watchdog(void);
  95 extern void stop_watchdog(void);
  96
  97
  98 void
  99 watchdog_bite_hook(struct pt_regs *regs)
 100 {
 101 #ifdef CONFIG_ETRAX_WATCHDOG_NICE_DOGGY
 102         local_irq_disable();
 103         stop_watchdog();
 104         show_registers(regs);
 105         while(1) /* nothing */;
 106 #else
 107         show_registers(regs);
 108 #endif
 109 }
 110
 111 /* This is normally the 'Oops' routine */
 112 void
 113 die_if_kernel(const char * str, struct pt_regs * regs, long err)
 114 {
 115         if(user_mode(regs))
 116                 return;
 117
 118 #ifdef CONFIG_ETRAX_WATCHDOG_NICE_DOGGY
 119         /* This printout might take too long and trigger the
 120          * watchdog normally. If we're in the nice doggy
 121          * development mode, stop the watchdog during printout.
 122          */
 123         stop_watchdog();
 124 #endif
 125
 126         raw_printk("%s: %04lx\n", str, err & 0xffff);
 127
 128         show_registers(regs);
 129
 130 #ifdef CONFIG_ETRAX_WATCHDOG_NICE_DOGGY
 131         reset_watchdog();
 132 #endif
 133         do_exit(SIGSEGV);
 134 }
 135
 136 void arch_enable_nmi(void)
 137 {
 138   asm volatile("setf m");
 139 }