i386/ucla/src/lab4/lib/panic.c

   1
   2 #include <inc/lib.h>
   3
   4 char *argv0;
   5
   6 /*
   7  * Panic is called on unresolvable fatal errors.
   8  * It prints "panic: <message>", then causes a breakpoint exception,
   9  * which causes JOS to enter the JOS kernel monitor.
  10  */
  11 void
  12 _panic(const char *file, int line, const char *fmt, ...)
  13 {
  14         va_list ap;
  15
  16         va_start(ap, fmt);
  17
  18         // Print the panic message
  19         if (argv0)
  20                 cprintf("%s: ", argv0);
  21         cprintf("user panic in %s at %s:%d: ", binaryname, file, line);
  22         vcprintf(fmt, ap);
  23         cprintf("\n");
  24
  25         // Cause a breakpoint exception
  26         while (1)
  27                 asm volatile("int3");
  28 }
  29