1/* $NetBSD: db_machdep.h,v 1.2 2018/04/19 21:50:07 christos Exp $ */
2
3/*-
4 * Copyright (c) 2014 The NetBSD Foundation, Inc.
5 * All rights reserved.
6 *
7 * This code is derived from software contributed to The NetBSD Foundation
8 * by Matt Thomas of 3am Software Foundry.
9 *
10 * Redistribution and use in source and binary forms, with or without
11 * modification, are permitted provided that the following conditions
12 * are met:
13 * 1. Redistributions of source code must retain the above copyright
14 *    notice, this list of conditions and the following disclaimer.
15 * 2. Redistributions in binary form must reproduce the above copyright
16 *    notice, this list of conditions and the following disclaimer in the
17 *    documentation and/or other materials provided with the distribution.
18 *
19 * THIS SOFTWARE IS PROVIDED BY THE NETBSD FOUNDATION, INC. AND CONTRIBUTORS
20 * ``AS IS'' AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED
21 * TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
22 * PURPOSE ARE DISCLAIMED.  IN NO EVENT SHALL THE FOUNDATION OR CONTRIBUTORS
23 * BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
24 * CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
25 * SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
26 * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
27 * CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
28 * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
29 * POSSIBILITY OF SUCH DAMAGE.
30 */
31
32#ifndef _OR1K_DB_MACHDEP_H_
33#define _OR1K_DB_MACHDEP_H_
34
35#include <or1k/frame.h>
36
37typedef long int db_expr_t;
38#define DDB_EXPR_FMT "lx"
39typedef uintptr_t db_addr_t;
40#define DDB_ADDR_FMT PRIxPTR
41
42#define BKPT_ADDR(addr)		(addr)
43#define BKPT_SIZE		4
44#define BKPT_INSN		0x21000000
45#define	BKPT_SET(insn, addr)	(BKPT_INSN)
46
47typedef struct trapframe db_regs_t;
48extern db_regs_t ddb_regs;
49#define DDB_REGS		(&ddb_regs)
50#define PC_REGS(tf)		((tf)->tf_pc)
51
52#define	DB_TRAP_UNKNOWN		0
53#define	DB_TRAP_BREAKPOINT	1
54#define	DB_TRAP_BKPT_INSN	2
55#define	DB_TRAP_WATCHPOINT	3
56
57#define IS_BREAKPOINT_TRAP(type, code) \
58	((type) == DB_TRAP_BREAKPOINT || (type) == DB_TRAP_BKPT_INSN)
59#define IS_WATCHPOINT_TRAP(type, code) \
60	((type) == DB_TRAP_WATCHPOINT)
61
62static __inline bool
63inst_call(db_expr_t insn)
64{
65	return (insn & 0xfc000000) == 0x04000000	/* l.jal */
66	    || (insn & 0xffff07ff) == 0x48000000;	/* l.jalr */
67}
68
69static __inline bool
70inst_load(db_expr_t insn)
71{
72	const unsigned int opcode = isns >> 26;
73	/* l.lwa (0x1b), l.ld (0x20) l.lwz (0x21), l.lws (0x22), */
74	/* l.lbz (0x23), l.lbs (0x24), l.lhz (0x25), l.lhs (0x26) */
75	return opcode == 0x1b || (opcode >= 0x20 && opcode <= 0x26);
76}
77
78static __inline bool
79inst_return(db_expr_t insn)
80{
81	return insn == 0x44004800;			/* l.jr r9 */
82}
83
84static __inline bool
85inst_store(db_expr_t insn)
86{
87	const unsigned int opcode = isns >> 26;
88 	/* l.swa (0x33), l.sd (0x33), l.sw (0x35), l.sb (0x36), l.sh (0x37) */
89	return opcode >= 0x33 && opcode <= 0x37;
90}
91
92static __inline bool
93inst_trap_return(db_expr_t insn)
94{
95	return insn == 0x24000000;			/* l.rfe */
96}
97
98#endif /* _OR1K_DB_MACHDEP_H_ */
99