The Design and Implementation of the FreeBSD Operating System, Second Edition
Now available: The Design and Implementation of the FreeBSD Operating System (Second Edition)


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FreeBSD/Linux Kernel Cross Reference
sys/kernel/exception.c

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    1 /* This file contains a simple exception handler.  Exceptions in user
    2  * processes are converted to signals. Exceptions in a kernel task cause
    3  * a panic.
    4  */
    5 
    6 #include "kernel.h"
    7 #include <signal.h>
    8 #include "proc.h"
    9 
   10 /*===========================================================================*
   11  *                              exception                                    *
   12  *===========================================================================*/
   13 PUBLIC void exception(vec_nr)
   14 unsigned vec_nr;
   15 {
   16 /* An exception or unexpected interrupt has occurred. */
   17 
   18   struct ex_s {
   19         char *msg;
   20         int signum;
   21         int minprocessor;
   22   };
   23   static struct ex_s ex_data[] = {
   24         { "Divide error", SIGFPE, 86 },
   25         { "Debug exception", SIGTRAP, 86 },
   26         { "Nonmaskable interrupt", SIGBUS, 86 },
   27         { "Breakpoint", SIGEMT, 86 },
   28         { "Overflow", SIGFPE, 86 },
   29         { "Bounds check", SIGFPE, 186 },
   30         { "Invalid opcode", SIGILL, 186 },
   31         { "Coprocessor not available", SIGFPE, 186 },
   32         { "Double fault", SIGBUS, 286 },
   33         { "Copressor segment overrun", SIGSEGV, 286 },
   34         { "Invalid TSS", SIGSEGV, 286 },
   35         { "Segment not present", SIGSEGV, 286 },
   36         { "Stack exception", SIGSEGV, 286 },    /* STACK_FAULT already used */
   37         { "General protection", SIGSEGV, 286 },
   38         { "Page fault", SIGSEGV, 386 },         /* not close */
   39         { NIL_PTR, SIGILL, 0 },                 /* probably software trap */
   40         { "Coprocessor error", SIGFPE, 386 },
   41   };
   42   register struct ex_s *ep;
   43   struct proc *saved_proc;
   44 
   45   /* Save proc_ptr, because it may be changed by debug statements. */
   46   saved_proc = proc_ptr;        
   47 
   48   ep = &ex_data[vec_nr];
   49 
   50   if (vec_nr == 2) {            /* spurious NMI on some machines */
   51         kprintf("got spurious NMI\n");
   52         return;
   53   }
   54 
   55   /* If an exception occurs while running a process, the k_reenter variable 
   56    * will be zero. Exceptions in interrupt handlers or system traps will make 
   57    * k_reenter larger than zero.
   58    */
   59   if (k_reenter == 0 && ! iskernelp(saved_proc)) {
   60         cause_sig(proc_nr(saved_proc), ep->signum);
   61         return;
   62   }
   63 
   64   /* Exception in system code. This is not supposed to happen. */
   65   if (ep->msg == NIL_PTR || machine.processor < ep->minprocessor)
   66         kprintf("\nIntel-reserved exception %d\n", vec_nr);
   67   else
   68         kprintf("\n%s\n", ep->msg);
   69   kprintf("k_reenter = %d ", k_reenter);
   70   kprintf("process %d (%s), ", proc_nr(saved_proc), saved_proc->p_name);
   71   kprintf("pc = %u:0x%x", (unsigned) saved_proc->p_reg.cs,
   72   (unsigned) saved_proc->p_reg.pc);
   73 
   74   panic("exception in a kernel task", NO_NUM);
   75 }
   76 

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