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

   1 /*
   2  * Helper functions for trap handlers
   3  *
   4  * Copyright (C) 2000-2007, Axis Communications AB.
   5  *
   6  * Authors:   Bjorn Wesen
   7  *            Hans-Peter Nilsson
   8  *
   9  */
  10
  11 #include <linux/ptrace.h>
  12 #include <asm/uaccess.h>
  13 #include <arch/sv_addr_ag.h>
  14 #include <arch/system.h>
  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 process for all cases this
  22          * function is called, and current->thread.usp isn't up to date for the
  23          * current process. Experience shows that using USP is the way to go.
  24          */
  25         unsigned long usp = rdusp();
  26
  27         printk("IRP: %08lx SRP: %08lx DCCR: %08lx USP: %08lx MOF: %08lx\n",
  28                regs->irp, regs->srp, regs->dccr, 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  sp: %08lx\n",
  40                regs->r12, regs->r13, regs->orig_r10, (long unsigned)regs);
  41
  42         printk("R_MMU_CAUSE: %08lx\n", (unsigned long)*R_MMU_CAUSE);
  43
  44         printk("Process %s (pid: %d, stackpage=%08lx)\n",
  45                current->comm, current->pid, (unsigned long)current);
  46
  47         /*
  48          * When in-kernel, we also print out the stack and code at the
  49          * time of the fault..
  50          */
  51         if (!user_mode(regs)) {
  52                 int i;
  53
  54                 show_stack(NULL, (unsigned long *)usp);
  55
  56                 /*
  57                  * If the previous stack-dump wasn't a kernel one, dump the
  58                  * kernel stack now.
  59                  */
  60                 if (usp != 0)
  61                         show_stack(NULL, NULL);
  62
  63                 printk("\nCode: ");
  64
  65                 if (regs->irp < PAGE_OFFSET)
  66                         goto bad_value;
  67
  68                 /*
  69                  * Quite often the value at regs->irp doesn't point to the
  70                  * interesting instruction, which often is the previous
  71                  * instruction. So dump at an offset large enough that the
  72                  * instruction decoding should be in sync at the interesting
  73                  * point, but small enough to fit on a row. The regs->irp
  74                  * location is pointed out in a ksymoops-friendly way by
  75                  * wrapping the byte for that address in parenthesises.
  76                  */
  77                 for (i = -12; i < 12; i++) {
  78                         unsigned char c;
  79
  80                         if (__get_user(c, &((unsigned char *)regs->irp)[i])) {
  81 bad_value:
  82                                 printk(" Bad IP value.");
  83                                 break;
  84                         }
  85
  86                         if (i == 0)
  87                                 printk("(%02x) ", c);
  88                         else
  89                                 printk("%02x ", c);
  90                 }
  91                 printk("\n");
  92         }
  93 }
  94
  95 void
  96 arch_enable_nmi(void)
  97 {
  98         asm volatile ("setf m");
  99 }
 100
 101 extern void (*nmi_handler)(struct pt_regs *);
 102 void handle_nmi(struct pt_regs *regs)
 103 {
 104         if (nmi_handler)
 105                 nmi_handler(regs);
 106
 107         /* Wait until nmi is no longer active. (We enable NMI immediately after
 108            returning from this function, and we don't want it happening while
 109            exiting from the NMI interrupt handler.) */
 110         while (*R_IRQ_MASK0_RD & IO_STATE(R_IRQ_MASK0_RD, nmi_pin, active))
 111                 ;
 112 }
 113
 114 #ifdef CONFIG_DEBUG_BUGVERBOSE
 115 void
 116 handle_BUG(struct pt_regs *regs)
 117 {
 118         struct bug_frame f;
 119         unsigned char c;
 120         unsigned long irp = regs->irp;
 121
 122         if (__copy_from_user(&f, (const void __user *)(irp - 8), sizeof f))
 123                 return;
 124         if (f.prefix != BUG_PREFIX || f.magic != BUG_MAGIC)
 125                 return;
 126         if (__get_user(c, f.filename))
 127                 f.filename = "<bad filename>";
 128
 129         printk("kernel BUG at %s:%d!\n", f.filename, f.line);
 130 }
 131 #endif