From 913f0b045e4f79c633f5c530ba83e5126d7db5b8 Mon Sep 17 00:00:00 2001
From: ragge <ragge@NetBSD.org>
Date: Fri, 16 Jun 1995 15:17:27 +0000
Subject: [PATCH] DDB support. splddb() and trapcode for ddb.

---
 sys/arch/vax/include/db_machdep.h | 73 +++++++++++++++++++++++++++++++
 sys/arch/vax/include/param.h      |  3 +-
 sys/arch/vax/include/trap.h       |  6 +--
 3 files changed, 78 insertions(+), 4 deletions(-)
 create mode 100644 sys/arch/vax/include/db_machdep.h

diff --git a/sys/arch/vax/include/db_machdep.h b/sys/arch/vax/include/db_machdep.h
new file mode 100644
index 000000000000..b2a9fd686423
--- /dev/null
+++ b/sys/arch/vax/include/db_machdep.h
@@ -0,0 +1,73 @@
+/*	$NetBSD: db_machdep.h,v 1.1 1995/06/16 15:17:27 ragge Exp $	*/
+
+/* 
+ * Mach Operating System
+ * Copyright (c) 1991,1990 Carnegie Mellon University
+ * All Rights Reserved.
+ * 
+ * Permission to use, copy, modify and distribute this software and its
+ * documentation is hereby granted, provided that both the copyright
+ * notice and this permission notice appear in all copies of the
+ * software, derivative works or modified versions, and any portions
+ * thereof, and that both notices appear in supporting documentation.
+ * 
+ * CARNEGIE MELLON ALLOWS FREE USE OF THIS SOFTWARE IN ITS "AS IS"
+ * CONDITION.  CARNEGIE MELLON DISCLAIMS ANY LIABILITY OF ANY KIND FOR
+ * ANY DAMAGES WHATSOEVER RESULTING FROM THE USE OF THIS SOFTWARE.
+ * 
+ * Carnegie Mellon requests users of this software to return to
+ * 
+ *  Software Distribution Coordinator  or  Software.Distribution@CS.CMU.EDU
+ *  School of Computer Science
+ *  Carnegie Mellon University
+ *  Pittsburgh PA 15213-3890
+ * 
+ * any improvements or extensions that they make and grant Carnegie Mellon
+ * the rights to redistribute these changes.
+ */
+
+#ifndef	_VAX_DB_MACHDEP_H_
+#define	_VAX_DB_MACHDEP_H_
+
+/*
+ * Machine-dependent defines for new kernel debugger.
+ * Modified for vax out of i386 code.
+ */
+
+#include <sys/param.h>
+#include <vm/vm.h>
+#include <machine/trap.h>
+
+typedef	vm_offset_t	db_addr_t;	/* address - unsigned */
+typedef	int		db_expr_t;	/* expression - signed */
+
+typedef struct trapframe db_regs_t;
+db_regs_t	ddb_regs;	/* register state */
+#define	DDB_REGS	(&ddb_regs)
+
+#define	PC_REGS(regs)	((db_addr_t)(regs)->pc)
+
+#define	BKPT_INST	0x03		/* breakpoint instruction */
+#define	BKPT_SIZE	(1)		/* size of breakpoint inst */
+#define	BKPT_SET(inst)	(BKPT_INST)
+
+#define	FIXUP_PC_AFTER_BREAK		ddb_regs.pc -= BKPT_SIZE;
+
+#define	db_clear_single_step(regs)	((regs)->psl &= ~PSL_T)
+#define	db_set_single_step(regs)	((regs)->psl |=  PSL_T)
+
+#define	IS_BREAKPOINT_TRAP(type, code)	((type) == T_BPTFLT)
+#define IS_WATCHPOINT_TRAP(type, code)	((type) == T_TRCTRAP)
+
+#define	I_CALL		0xfb
+#define	I_RET		0x04
+#define	I_IRET		0x02
+
+#define	inst_trap_return(ins)	(((ins)&0xff) == I_IRET)
+#define	inst_return(ins)	(((ins)&0xff) == I_RET)
+#define	inst_call(ins)		(((ins)&0xff) == I_CALL)
+
+#define inst_load(ins)		0
+#define inst_store(ins)		0
+
+#endif	/* _VAX_DB_MACHDEP_H_ */
diff --git a/sys/arch/vax/include/param.h b/sys/arch/vax/include/param.h
index 752ce4ce2f2b..e643dfc0921a 100644
--- a/sys/arch/vax/include/param.h
+++ b/sys/arch/vax/include/param.h
@@ -1,4 +1,4 @@
-/*      $NetBSD: param.h,v 1.8 1995/05/03 19:53:46 ragge Exp $    */
+/*      $NetBSD: param.h,v 1.9 1995/06/16 15:17:33 ragge Exp $    */
 
 /*-
  * Copyright (c) 1990 The Regents of the University of California.
@@ -184,6 +184,7 @@
 #define	spl0()		splx(0)		/* IPL0  */
 #define splsoftclock()  splx(8)		/* IPL08 */
 #define splnet()        splx(0xc)	/* IPL0C */
+#define	splddb()	splx(0xf)	/* IPL0F */
 #define spl4()          splx(0x14)	/* IPL14 */
 #define spltty()        splx(0x15)	/* IPL15 */
 #define splbio()        splx(0x15)	/* IPL15 */
diff --git a/sys/arch/vax/include/trap.h b/sys/arch/vax/include/trap.h
index 7f01984584f8..b1cafc137852 100644
--- a/sys/arch/vax/include/trap.h
+++ b/sys/arch/vax/include/trap.h
@@ -1,4 +1,4 @@
-/*      $NetBSD: trap.h,v 1.7 1995/06/05 17:18:00 ragge Exp $     */
+/*      $NetBSD: trap.h,v 1.8 1995/06/16 15:17:40 ragge Exp $     */
 
 /*-
  * Copyright (c) 1990 The Regents of the University of California.
@@ -59,9 +59,9 @@
 #define	T_ACCFLT	12	/* Access violation fault */
 /* #define	T_TABLEFLT	13	/* page table fault */
 /* #define	T_ALIGNFLT	14	/* alignment fault */
-/* #define	T_KSPNOTVAL	15	/* kernel stack pointer not valid */
+#define	T_KSPNOTVAL	15	/* kernel stack pointer not valid */
 /* #define	T_BUSERR	16	/* bus error */
-/* #define	T_KDBTRAP	17	/* kernel debugger trap */
+#define	T_KDBTRAP	17	/* kernel debugger trap */
 
 /* #define	T_DIVIDE	18	/* integer divide fault */
 /* #define	T_NMI		19	/* non-maskable trap */