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, 4 insertions, 53 deletions

diff --git a/sys/ddb/db_command.c b/sys/ddb/db_command.c
index 70b3556..954a0d3 100644
--- a/sys/ddb/db_command.c
+++ b/sys/ddb/db_command.c
@@ -37,6 +37,7 @@ __FBSDID("$FreeBSD$");
 #include <sys/param.h>
 #include <sys/linker_set.h>
 #include <sys/lock.h>
+#include <sys/kdb.h>
 #include <sys/mutex.h>
 #include <sys/proc.h>
 #include <sys/reboot.h>
@@ -58,7 +59,6 @@ __FBSDID("$FreeBSD$");
  */
 boolean_t	db_cmd_loop_done;
 db_addr_t	db_dot;
-jmp_buf		db_jmpbuf;
 db_addr_t	db_last_addr;
 db_addr_t	db_prev;
 db_addr_t	db_next;
@@ -67,7 +67,6 @@ SET_DECLARE(db_cmd_set, struct command);
 SET_DECLARE(db_show_cmd_set, struct command);
 
 static db_cmdfcn_t	db_fncall;
-static db_cmdfcn_t	db_gdb;
 static db_cmdfcn_t	db_kill;
 static db_cmdfcn_t	db_reset;
 static db_cmdfcn_t	db_watchdog;
@@ -375,9 +374,6 @@ db_command(last_cmdp, cmd_table, aux_cmd_tablep, aux_cmd_tablep_end)
  */
 
 static struct command db_show_all_cmds[] = {
-#if 0
-	{ "threads",	db_show_all_threads,	0,	0 },
-#endif
 	{ "procs",	db_ps,			0,	0 },
 	{ (char *)0 }
 };
@@ -386,10 +382,7 @@ static struct command db_show_cmds[] = {
 	{ "all",	0,			0,	db_show_all_cmds },
 	{ "registers",	db_show_regs,		0,	0 },
 	{ "breaks",	db_listbreak_cmd, 	0,	0 },
-	{ "thread",	db_show_one_thread,	0,	0 },
-#if 0
-	{ "port",	ipc_port_print,		0,	0 },
-#endif
+	{ "threads",	db_show_threads,	0,	0 },
 	{ (char *)0, }
 };
 
@@ -421,29 +414,15 @@ static struct command db_command_table[] = {
 	{ "call",	db_fncall,		CS_OWN,	0 },
 	{ "show",	0,			0,	db_show_cmds },
 	{ "ps",		db_ps,			0,	0 },
-	{ "gdb",	db_gdb,			0,	0 },
 	{ "reset",	db_reset,		0,	0 },
 	{ "kill",	db_kill,		CS_OWN,	0 },
 	{ "watchdog",	db_watchdog,		0,	0 },
+	{ "thread",	db_set_thread,		CS_OWN,	0 },
 	{ (char *)0, }
 };
 
 static struct command	*db_last_command = 0;
 
-#if 0
-void
-db_help_cmd()
-{
-	struct command *cmd = db_command_table;
-
-	while (cmd->name != 0) {
-	    db_printf("%-12s", cmd->name);
-	    db_end_line();
-	    cmd++;
-	}
-}
-#endif
-
 /*
  * At least one non-optional command must be implemented using
  * DB_COMMAND() so that db_cmd_set gets created.  Here is one.
@@ -464,8 +443,6 @@ db_command_loop()
 
 	db_cmd_loop_done = 0;
 	while (!db_cmd_loop_done) {
-
-	    (void) setjmp(db_jmpbuf);
 	    if (db_print_position() != 0)
 		db_printf("\n");
 
@@ -484,7 +461,7 @@ db_error(s)
 	if (s)
 	    db_printf("%s", s);
 	db_flush_lex();
-	longjmp(db_jmpbuf, 1);
+	kdb_reenter();
 }
 
 
@@ -553,32 +530,6 @@ db_fncall(dummy1, dummy2, dummy3, dummy4)
 	db_printf("%#lr\n", (long)retval);
 }
 
-/* Enter GDB remote protocol debugger on the next trap. */
-
-void	  *gdb_arg = NULL;
-cn_getc_t *gdb_getc;
-cn_putc_t *gdb_putc;
-
-static void
-db_gdb (dummy1, dummy2, dummy3, dummy4)
-	db_expr_t	dummy1;
-	boolean_t	dummy2;
-	db_expr_t	dummy3;
-	char *		dummy4;
-{
-
-	if (gdb_arg == NULL) {
-		db_printf("No gdb port enabled. Set flag 0x80 on desired port\n");
-		db_printf("in your configuration file (currently sio only).\n");
-		return;
-	}
-	boothowto ^= RB_GDB;
-
-	db_printf("Next trap will enter %s\n",
-		   boothowto & RB_GDB ? "GDB remote protocol mode"
-				      : "DDB debugger");
-}
-
 static void
 db_kill(dummy1, dummy2, dummy3, dummy4)
 	db_expr_t	dummy1;