Mega update for the KDB framework: turn DDB into a KDB backend.

Most of the changes are a direct result of adding thread awareness.
Typically, DDB_REGS is gone. All registers are taken from the
trapframe and backtraces use the PCB based contexts. DDB_REGS was
defined to be a trapframe on all platforms anyway.
Thread awareness introduces the following new commands:
	thread X	switch to thread X (where X is the TID),
	show threads	list all threads.

The backtrace code has been made more flexible so that one can
create backtraces for any thread by giving the thread ID as an
argument to trace.

With this change, ia64 has support for breakpoints.

1 files changed, 0 insertions, 43 deletions

diff --git a/sys/ddb/db_break.c b/sys/ddb/db_break.c
index 577e338..78f4f4f 100644
--- a/sys/ddb/db_break.c
+++ b/sys/ddb/db_break.c
@@ -367,46 +367,3 @@ db_map_addr(addr)
 #endif
 	    return kernel_map;
 }
-
-#ifdef ALT_BREAK_TO_DEBUGGER
-/*
- * Solaris implements a new BREAK which is initiated by a character sequence
- * CR ~ ^b which is similar to a familiar pattern used on Sun servers by the
- * Remote Console.
- *
- * Note that this function may be called from almost anywhere, with interrupts
- * disabled and with unknown locks held, so it must not access data other than
- * its arguments.  Its up to the caller to ensure that the state variable is
- * consistent.
- */
-
-#define	KEY_CR		13	/* CR '\r' */
-#define	KEY_TILDE	126	/* ~ */
-#define	KEY_CRTLB	2	/* ^B */
-
-int
-db_alt_break(int data, int *state)
-{
-	int brk = 0;
-
-	switch (data) {
-	case KEY_CR:
-		*state = KEY_TILDE;
-		break;
-	case KEY_TILDE:
-		if (*state == KEY_TILDE)
-			*state = KEY_CRTLB;
-		else
-			*state = 0;
-		break;
-	case KEY_CRTLB:
-		if (*state == KEY_CRTLB)
-			brk = 1;
-		/* FALLTHROUGH */
-	default:
-		*state = 0;
-		break;
-	}
-	return (brk);
-}
-#endif