i386/junos/ucla/src/lab5/lib/panic.c

   1 #include <inc/lib.h>
   2
   3 const char *argv0;
   4
   5 /*
   6  * Panic is called on unresolvable fatal errors.
   7  * It prints "panic: <message>", then causes a breakpoint exception,
   8  * which causes JOS to enter the JOS kernel monitor.
   9  */
  10 void
  11 _panic(const char *file, int line, const char *fmt, ...)
  12 {
  13         va_list ap;
  14
  15         va_start(ap, fmt);
  16
  17         // Print the panic message
  18         if (argv0)
  19                 cprintf("%s: ", argv0);
  20         cprintf("[%08x] user panic in %s at %s:%d: ",
  21                 sys_getenvid(), binaryname, file, line);
  22         vcprintf(fmt, ap);
  23         cprintf("\n");
  24
  25         // Cause a breakpoint exception
  26         while (1)
  27                 asm volatile("int3");
  28 }