panic() cleanup.

this change
   - makes panic() variadic, doing full printf() formatting -
     no more NO_NUM, and no more separate printf() statements
     needed to print extra info (or something in hex) before panicing
   - unifies panic() - same panic() name and usage for everyone -
     vm, kernel and rest have different names/syntax currently
     in order to implement their own luxuries, but no longer
   - throws out the 1st argument, to make source less noisy.
     the panic() in syslib retrieves the server name from the kernel
     so it should be clear enough who is panicing; e.g.
         panic("sigaction failed: %d", errno);
     looks like:
         at_wini(73130): panic: sigaction failed: 0
         syslib:panic.c: stacktrace: 0x74dc 0x2025 0x100a
   - throws out report() - printf() is more convenient and powerful
   - harmonizes/fixes the use of panic() - there were a few places
     that used printf-style formatting (didn't work) and newlines
     (messes up the formatting) in panic()
   - throws out a few per-server panic() functions
   - cleans up a tie-in of tty with panic()

merging printf() and panic() statements to be done incrementally.

kernel/utility.c

@@ -1,42 +1,35 @@
 /* This file contains a collection of miscellaneous procedures:
- *   minix_panic:    abort MINIX due to a fatal error
+ *   panic:    abort MINIX due to a fatal error
  *   kputc:          buffered putc used by kernel printf
  */
 
 #include "kernel.h"
 #include "proc.h"
 
+#include <minix/syslib.h>
 #include <unistd.h>
+#include <stdarg.h>
 #include <signal.h>
 
 #include <minix/sys_config.h>
 
-/*===========================================================================*
- *			panic                                        *
- *===========================================================================*/
-PUBLIC void panic(char *what, char *mess,int nr)
-{
-/* This function is for when a library call wants to panic.
- * The library call calls printf() and tries to exit a process,
- * which isn't applicable in the kernel.
- */
-	minix_panic(mess, nr);
-}
+#define ARE_PANICING 0xDEADC0FF
 
 /*===========================================================================*
- *			minix_panic                                        *
+ *			panic                                          *
  *===========================================================================*/
-PUBLIC void minix_panic(char *mess,int nr)
+PUBLIC void panic(const char *fmt, ...)
 {
-/* The system has run aground of a fatal kernel error. Terminate execution. */
-if (minix_panicing++) {
+  va_list arg;
+  /* The system has run aground of a fatal kernel error. Terminate execution. */
+  if (minix_panicing == ARE_PANICING) {
 	arch_monitor();
-}
-
-  if (mess != NULL) {
-	printf("kernel panic: %s", mess);
-	if(nr != NO_NUM)
-		printf(" %d", nr);
+  }
+  minix_panicing = ARE_PANICING;
+  if (fmt != NULL) {
+	printf("kernel panic: ");
+  	va_start(arg, fmt);
+	vprintf(fmt, arg);
 	printf("\n");
   }