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
37 typedef long int db_expr_t;
38 #define DDB_EXPR_FMT "lx"
39 typedef 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
47 typedef struct trapframe db_regs_t;
48 extern 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
62 static __inline bool
inst_call(db_expr_t insn)63 inst_call(db_expr_t insn)
64 {
65 return (insn & 0xfc000000) == 0x04000000 /* l.jal */
66 || (insn & 0xffff07ff) == 0x48000000; /* l.jalr */
67 }
68
69 static __inline bool
inst_load(db_expr_t insn)70 inst_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
78 static __inline bool
inst_return(db_expr_t insn)79 inst_return(db_expr_t insn)
80 {
81 return insn == 0x44004800; /* l.jr r9 */
82 }
83
84 static __inline bool
inst_store(db_expr_t insn)85 inst_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
92 static __inline bool
inst_trap_return(db_expr_t insn)93 inst_trap_return(db_expr_t insn)
94 {
95 return insn == 0x24000000; /* l.rfe */
96 }
97
98 #endif /* _OR1K_DB_MACHDEP_H_ */
99