X-Git-Url: https://pintos-os.org/cgi-bin/gitweb.cgi?a=blobdiff_plain;f=src%2Flib%2Fdebug.c;h=534fc02c6d9066438f04e3538bd4a09dd6c3a741;hb=9bade155997ac1dfe4eebb5b5dfe7ff2b38ffdc8;hp=577ab67f06c39f60f8fd606d157b6a8a564916bd;hpb=750d21936d284127e265d050ccbce76fca1ece1a;p=pintos-anon

diff --git a/src/lib/debug.c b/src/lib/debug.c
index 577ab67..534fc02 100644
--- a/src/lib/debug.c
+++ b/src/lib/debug.c
@@ -3,17 +3,103 @@
 #include "interrupt.h"
 #include "lib.h"
 
+#define MAX_CLASSES 16
+static bool all_enabled;
+static const char *enabled_classes[MAX_CLASSES];
+static size_t enabled_cnt;
+
+static bool class_is_enabled (const char *class);
+
+/* Enables the debug message classes specified in CLASSES.  The
+   string CLASSES is modified by and becomes owned by this
+   function. */
+void
+debug_enable (char *classes) 
+{
+  char *class, *save;
+
+  for (class = strtok_r (classes, ",", &save); class != NULL;
+       class = strtok_r (NULL, ",", &save))
+    {
+      if (strcmp (class, "all") && enabled_cnt < MAX_CLASSES)
+        enabled_classes[enabled_cnt++] = class;
+      else
+        all_enabled = true;
+    }
+}
+
+/* Prints a debug message along with the source file name, line
+   number, and function name of where it was emitted.  CLASS is
+   used to filter out unwanted messages. */
+void
+debug_message (const char *file, int line, const char *function,
+               const char *class, const char *message, ...) 
+{
+  if (class_is_enabled (class)) 
+    {
+      va_list args;
+
+      enum intr_level old_level = intr_disable ();
+      printk ("%s:%d: %s(): ", file, line, function);
+      va_start (args, message);
+      vprintk (message, args);
+      printk ("\n");
+      va_end (args);
+      intr_set_level (old_level);
+    }
+}
+
+/* Halts the OS, printing the source file name, line number, and
+   function name, plus a user-specific message. */
 void
-panic (const char *format, ...)
+debug_panic (const char *file, int line, const char *function,
+             const char *message, ...)
 {
   va_list args;
 
   intr_disable ();
 
-  va_start (args, format);
-  vprintk (format, args);
+  printk ("PANIC at %s:%d in %s(): ", file, line, function);
+  va_start (args, message);
+  vprintk (message, args);
   printk ("\n");
   va_end (args);
 
+  debug_backtrace ();
+
   for (;;);
 }
+
+/* Prints the call stack, that is, a list of addresses in each of
+   the functions we are nested within.  gdb or addr2line may be
+   applied to kernel.o to translate these into file names, line
+   numbers, and function names.  */
+void
+debug_backtrace (void) 
+{
+  void **frame;
+  
+  printk ("Call stack:");
+  for (frame = __builtin_frame_address (0);
+       frame != NULL && frame[0] != NULL;
+       frame = frame[0]) 
+    printk (" %p", frame[1]);
+  printk (".\n");
+}
+
+
+/* Returns true if CLASS is enabled, false otherwise. */
+static bool
+class_is_enabled (const char *class) 
+{
+  size_t i;
+  
+  if (all_enabled)
+    return true;
+
+  for (i = 0; i < enabled_cnt; i++)
+    if (!strcmp (enabled_classes[i], class))
+      return true;
+
+  return false;
+}