From e8b45fe8b5c6801f60e2825d09a2bda22e80372a Mon Sep 17 00:00:00 2001
From: Justus Winter <justus@gnupg.org>
Date: Sun, 2 Apr 2017 00:13:56 +0200
Subject: ddb: debug traps and port references

* ddb/db_command.c (db_debug_all_traps_cmd): New declaration and
function.
(db_debug_port_references_cmd): Likewise.
* doc/mach.texi: Describe new commands.
* i386/i386/db_interface.h (db_debug_all_traps): New declaration.
* i386/i386/trap.c (db_debug_all_traps): New function.
* ipc/mach_port.c (db_debug_port_references): New function.
* ipc/mach_port.h (db_debug_port_references): New declaration.
---
 ddb/db_command.c         | 46 ++++++++++++++++++++++++++++++++++++++++++++++
 doc/mach.texi            |  8 ++++++++
 i386/i386/db_interface.h |  2 ++
 i386/i386/trap.c         | 10 ++++++++++
 ipc/mach_port.c          | 10 ++++++++++
 ipc/mach_port.h          |  4 ++++
 6 files changed, 80 insertions(+)

diff --git a/ddb/db_command.c b/ddb/db_command.c
index 721f04fe..11bca7ac 100644
--- a/ddb/db_command.c
+++ b/ddb/db_command.c
@@ -332,6 +332,23 @@ struct db_command db_show_cmds[] = {
 	{ (char *)0, }
 };
 
+void
+db_debug_all_traps_cmd(db_expr_t addr,
+		int have_addr,
+		db_expr_t count,
+		const char *modif);
+void
+db_debug_port_references_cmd(db_expr_t addr,
+			 int have_addr,
+			 db_expr_t count,
+			 const char *modif);
+
+struct db_command db_debug_cmds[] = {
+	{ "traps",		db_debug_all_traps_cmd,		0,	0 },
+	{ "references",		db_debug_port_references_cmd,	0,	0 },
+	{ (char *)0, }
+};
+
 struct db_command db_command_table[] = {
 #ifdef DB_MACHINE_COMMANDS
   /* this must be the first entry, if it exists */
@@ -364,6 +381,7 @@ struct db_command db_command_table[] = {
 	{ "macro",	db_def_macro_cmd,	CS_OWN,	 	0 },
 	{ "dmacro",	db_del_macro_cmd,	CS_OWN,		0 },
 	{ "show",	0,			0,	db_show_cmds },
+	{ "debug",	0,			0,	db_debug_cmds },
 	{ "reset",	db_reset_cpu,		0,		0 },
 	{ "reboot",	db_reset_cpu,		0,		0 },
 	{ "halt",	db_halt_cpu,		0,		0 },
@@ -538,4 +556,32 @@ db_option(modif, option)
 	return(FALSE);
 }
 
+void
+db_debug_all_traps_cmd(db_expr_t addr,
+		       int have_addr,
+		       db_expr_t count,
+		       const char *modif)
+{
+  if (strcmp (modif, "on") == 0)
+    db_debug_all_traps (TRUE);
+  else if (strcmp (modif, "off") == 0)
+    db_debug_all_traps (FALSE);
+  else
+    db_error ("debug traps /on|/off\n");
+}
+
+void
+db_debug_port_references_cmd(db_expr_t addr,
+			     int have_addr,
+			     db_expr_t count,
+			     const char *modif)
+{
+  if (strcmp (modif, "on") == 0)
+    db_debug_port_references (TRUE);
+  else if (strcmp (modif, "off") == 0)
+    db_debug_port_references (FALSE);
+  else
+    db_error ("debug references /on|/off\n");
+}
+
 #endif /* MACH_KDB */
diff --git a/doc/mach.texi b/doc/mach.texi
index 1f13b12c..b2357b81 100644
--- a/doc/mach.texi
+++ b/doc/mach.texi
@@ -7125,6 +7125,14 @@ If you want to clear a watch point in user space, specify @code{T} and
 parameter is omitted, a task of the default target thread or a current
 task is assumed.  If you specify a wrong space address, the request is
 rejected with an error message.
+
+@item debug traps /on|/off
+Enables or disables debugging of all traps with @code{ddb}.
+
+@item debug references /on|/off
+Enables or disables debugging of all port reference counting errors
+with @code{ddb}.
+
 @end table
 
 
diff --git a/i386/i386/db_interface.h b/i386/i386/db_interface.h
index 8d7daeae..9ffb6a60 100644
--- a/i386/i386/db_interface.h
+++ b/i386/i386/db_interface.h
@@ -129,4 +129,6 @@ db_write_bytes_user_space(
 	char		*data,
 	task_t		task);
 
+void db_debug_all_traps (boolean_t enable);
+
 #endif /* _I386_DB_INTERFACE_H_ */
diff --git a/i386/i386/trap.c b/i386/i386/trap.c
index d4bdc7f2..d3f61314 100644
--- a/i386/i386/trap.c
+++ b/i386/i386/trap.c
@@ -626,3 +626,13 @@ interrupted_pc(t)
  	return iss->eip;
 }
 #endif	/* MACH_PCSAMPLE > 0 */
+
+#if	MACH_KDB
+
+void
+db_debug_all_traps (boolean_t enable)
+{
+	debug_all_traps_with_kdb = enable;
+}
+
+#endif	/* MACH_KDB */
diff --git a/ipc/mach_port.c b/ipc/mach_port.c
index 5cc39984..b30dcd6c 100644
--- a/ipc/mach_port.c
+++ b/ipc/mach_port.c
@@ -1566,3 +1566,13 @@ mach_port_clear_protected_payload(
 	ip_unlock(port);
 	return KERN_SUCCESS;
 }
+
+#if	MACH_KDB
+
+void
+db_debug_port_references (boolean_t enable)
+{
+	mach_port_deallocate_debug = enable;
+}
+
+#endif	/* MACH_KDB */
diff --git a/ipc/mach_port.h b/ipc/mach_port.h
index c4d9a1c3..073f7946 100644
--- a/ipc/mach_port.h
+++ b/ipc/mach_port.h
@@ -65,4 +65,8 @@ mach_port_get_receive_status(
 	mach_port_t 		name,
 	mach_port_status_t 	*statusp);
 
+#if	MACH_KDB
+void db_debug_port_references (boolean_t enable);
+#endif	/* MACH_KDB */
+
 #endif /* _IPC_MACH_PORT_H_ */
-- 
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