arch/v850/kernel/bug.c

   1 /*
   2  * arch/v850/kernel/bug.c -- Bug reporting functions
   3  *
   4  *  Copyright (C) 2001,02,03  NEC Electronics Corporation
   5  *  Copyright (C) 2001,02,03  Miles Bader <miles@gnu.org>
   6  *
   7  * This file is subject to the terms and conditions of the GNU General
   8  * Public License.  See the file COPYING in the main directory of this
   9  * archive for more details.
  10  *
  11  * Written by Miles Bader <miles@gnu.org>
  12  */
  13
  14 #include <linux/kernel.h>
  15 #include <linux/reboot.h>
  16 #include <linux/sched.h>
  17 #include <linux/module.h>
  18
  19 #include <asm/errno.h>
  20 #include <asm/ptrace.h>
  21 #include <asm/processor.h>
  22 #include <asm/current.h>
  23
  24 /* We should use __builtin_return_address, but it doesn't work in gcc-2.90
  25    (which is currently our standard compiler on the v850).  */
  26 #define ret_addr() ({ register u32 lp asm ("lp"); lp; })
  27 #define stack_addr() ({ register u32 sp asm ("sp"); sp; })
  28
  29 void __bug ()
  30 {
  31         printk (KERN_CRIT "kernel BUG at PC 0x%x (SP ~0x%x)!\n",
  32                 ret_addr() - 4, /* - 4 for `jarl' */
  33                 stack_addr());
  34         machine_halt ();
  35 }
  36
  37 int bad_trap (int trap_num, struct pt_regs *regs)
  38 {
  39         printk (KERN_CRIT
  40                 "unimplemented trap %d called at 0x%08lx, pid %d!\n",
  41                 trap_num, regs->pc, current->pid);
  42         return -ENOSYS;
  43 }
  44
  45 #ifdef CONFIG_RESET_GUARD
  46 void unexpected_reset (unsigned long ret_addr, unsigned long kmode,
  47                        struct task_struct *task, unsigned long sp)
  48 {
  49         printk (KERN_CRIT
  50                 "unexpected reset in %s mode, pid %d"
  51                 " (ret_addr = 0x%lx, sp = 0x%lx)\n",
  52                 kmode ? "kernel" : "user",
  53                 task ? task->pid : -1,
  54                 ret_addr, sp);
  55
  56         machine_halt ();
  57 }
  58 #endif /* CONFIG_RESET_GUARD */
  59
  60 \f
  61
  62 struct spec_reg_name {
  63         const char *name;
  64         int gpr;
  65 };
  66
  67 struct spec_reg_name spec_reg_names[] = {
  68         { "sp", GPR_SP },
  69         { "gp", GPR_GP },
  70         { "tp", GPR_TP },
  71         { "ep", GPR_EP },
  72         { "lp", GPR_LP },
  73         { 0, 0 }
  74 };
  75
  76 void show_regs (struct pt_regs *regs)
  77 {
  78         int gpr_base, gpr_offs;
  79
  80         printk ("     pc 0x%08lx    psw 0x%08lx                       kernel_mode %d\n",
  81                 regs->pc, regs->psw, regs->kernel_mode);
  82         printk ("   ctpc 0x%08lx  ctpsw 0x%08lx   ctbp 0x%08lx\n",
  83                 regs->ctpc, regs->ctpsw, regs->ctbp);
  84
  85         for (gpr_base = 0; gpr_base < NUM_GPRS; gpr_base += 4) {
  86                 for (gpr_offs = 0; gpr_offs < 4; gpr_offs++) {
  87                         int gpr = gpr_base + gpr_offs;
  88                         long val = regs->gpr[gpr];
  89                         struct spec_reg_name *srn;
  90
  91                         for (srn = spec_reg_names; srn->name; srn++)
  92                                 if (srn->gpr == gpr)
  93                                         break;
  94
  95                         if (srn->name)
  96                                 printk ("%7s 0x%08lx", srn->name, val);
  97                         else
  98                                 printk ("    r%02d 0x%08lx", gpr, val);
  99                 }
 100
 101                 printk ("\n");
 102         }
 103 }
 104
 105 /*
 106  * TASK is a pointer to the task whose backtrace we want to see (or NULL
 107  * for current task), SP is the stack pointer of the first frame that
 108  * should be shown in the back trace (or NULL if the entire call-chain of
 109  * the task should be shown).
 110  */
 111 void show_stack (struct task_struct *task, unsigned long *sp)
 112 {
 113         unsigned long addr, end;
 114
 115         if (sp)
 116                 addr = (unsigned long)sp;
 117         else if (task)
 118                 addr = task_sp (task);
 119         else
 120                 addr = stack_addr ();
 121
 122         addr = addr & ~3;
 123         end = (addr + THREAD_SIZE - 1) & THREAD_MASK;
 124
 125         while (addr < end) {
 126                 printk ("%8lX: ", addr);
 127                 while (addr < end) {
 128                         printk (" %8lX", *(unsigned long *)addr);
 129                         addr += sizeof (unsigned long);
 130                         if (! (addr & 0xF))
 131                                 break;
 132                 }
 133                 printk ("\n");
 134         }
 135 }
 136
 137 void dump_stack ()
 138 {
 139         show_stack (0, 0);
 140 }
 141
 142 EXPORT_SYMBOL(dump_stack);