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, 105 insertions, 0 deletions

diff --git a/sys/ddb/db_thread.c b/sys/ddb/db_thread.c
new file mode 100644
index 0000000..b58f0b0
--- /dev/null
+++ b/sys/ddb/db_thread.c
@@ -0,0 +1,105 @@
+/*
+ * Copyright (c) 2004 Marcel Moolenaar
+ * All rights reserved.
+ *
+ * Redistribution and use in source and binary forms, with or without
+ * modification, are permitted provided that the following conditions
+ * are met:
+ *
+ * 1. Redistributions of source code must retain the above copyright
+ *    notice, this list of conditions and the following disclaimer.
+ * 2. Redistributions in binary form must reproduce the above copyright
+ *    notice, this list of conditions and the following disclaimer in the
+ *    documentation and/or other materials provided with the distribution.
+ *
+ * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR
+ * IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
+ * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.
+ * IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT,
+ * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
+ * NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
+ * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
+ * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
+ * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF
+ * THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
+ */
+
+#include <sys/cdefs.h>
+__FBSDID("$FreeBSD$");
+
+#include <sys/param.h>
+#include <sys/systm.h>
+#include <sys/kdb.h>
+#include <sys/proc.h>
+
+#include <machine/pcb.h>
+
+#include <ddb/ddb.h>
+#include <ddb/db_command.h>
+#include <ddb/db_sym.h>
+
+void
+db_print_thread(void)
+{
+	db_printf("[thread %ld]\n", (long)kdb_thread->td_tid);
+}
+
+void
+db_set_thread(db_expr_t tid, boolean_t hastid, db_expr_t cnt, char *mod)
+{
+	struct thread *thr;
+	db_expr_t radix;
+	int err;
+
+	/*
+	 * We parse our own arguments. We don't like the default radix.
+	 */
+	radix = db_radix;
+	db_radix = 10;
+	hastid = db_expression(&tid);
+	db_radix = radix;
+	db_skip_to_eol();
+
+	if (hastid) {
+		thr = kdb_thr_lookup(tid);
+		if (thr != NULL) {
+			err = kdb_thr_select(thr);
+			if (err != 0) {
+				db_printf("unable to switch to thread %ld\n",
+				    (long)thr->td_tid);
+				return;
+			}
+			db_dot = PC_REGS();
+		} else {
+			db_printf("%d: invalid thread\n", (int)tid);
+			return;
+		}
+	}
+
+	db_print_thread();
+	db_print_loc_and_inst(PC_REGS());
+}
+
+void
+db_show_threads(db_expr_t addr, boolean_t hasaddr, db_expr_t cnt, char *mod)
+{
+	jmp_buf jb;
+	void *prev_jb;
+	struct thread *thr;
+	int pager_quit;
+
+	db_setup_paging(db_simple_pager, &pager_quit, DB_LINES_PER_PAGE);
+
+	pager_quit = 0;
+	thr = kdb_thr_first();
+	while (!pager_quit && thr != NULL) {
+		db_printf("  %6ld (%p)  ", (long)thr->td_tid, thr);
+		prev_jb = kdb_jmpbuf(jb);
+		if (setjmp(jb) == 0) {
+			if (db_trace_thread(thr, 1) != 0)
+				db_printf("***\n");
+		}
+		kdb_jmpbuf(prev_jb);
+		thr = kdb_thr_next(thr);
+	}
+}