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
  10 extern void reset_watchdog(void);
  11 extern void stop_watchdog(void);
  12
  13 extern int raw_printk(const char *fmt, ...);
  14
  15 void
  16 show_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])) {
  91 bad_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  */
 111 void
 112 watchdog_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. */
 127 void
 128 die_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
 153 void 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 }