1/*-
 2 * SPDX-License-Identifier: BSD-2-Clause
 3 *
 4 * Copyright (c) 2021 Mitchell Horne <mhorne@FreeBSD.org>
 5 *
 6 * Redistribution and use in source and binary forms, with or without
 7 * modification, are permitted provided that the following conditions
 8 * are met:
 9 *
10 * 1. Redistributions of source code must retain the above copyright
11 *    notice, this list of conditions and the following disclaimer.
12 * 2. Redistributions in binary form must reproduce the above copyright
13 *    notice, this list of conditions and the following disclaimer in the
14 *    documentation and/or other materials provided with the distribution.
15 *
16 * THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND
17 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
18 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
19 * ARE DISCLAIMED.  IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
20 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
21 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
22 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
23 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
24 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
25 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
26 * SUCH DAMAGE.
27 */
28
29#ifndef _MACHINE_GDB_MACHDEP_H_
30#define	_MACHINE_GDB_MACHDEP_H_
31
32#define	GDB_BUFSZ		4096
33#define	GDB_NREGS		33
34#define	GDB_REG_ZERO		0
35#define	GDB_REG_RA		1
36#define	GDB_REG_SP		2
37#define	GDB_REG_GP		3
38#define	GDB_REG_TP		4
39#define	GDB_REG_T0		5
40#define	GDB_REG_FP		8
41#define	GDB_REG_S1		9
42#define	GDB_REG_A0		10
43#define	GDB_REG_S2		18
44#define	GDB_REG_T3		28
45#define	GDB_REG_PC		32
46#define	GDB_REG_CSR_BASE	65
47#define	GDB_REG_SSTATUS		(GDB_REG_CSR_BASE + 0x100)
48#define	GDB_REG_SCAUSE		(GDB_REG_CSR_BASE + 0x142)
49#define	GDB_REG_STVAL		(GDB_REG_CSR_BASE + 0x143)
50_Static_assert(GDB_BUFSZ >= (GDB_NREGS * 8), "buffer fits 'g' regs");
51
52static __inline size_t
53gdb_cpu_regsz(int regnum __unused)
54{
55
56	return (8);
57}
58
59static __inline int
60gdb_cpu_query(void)
61{
62	return (0);
63}
64
65static __inline void *
66gdb_begin_write(void)
67{
68
69	return (NULL);
70}
71
72static __inline void
73gdb_end_write(void *arg __unused)
74{
75
76}
77
78static __inline void
79gdb_cpu_stop_reason(int type __unused, int code __unused)
80{
81
82}
83
84void	*gdb_cpu_getreg(int, size_t *);
85void	 gdb_cpu_setreg(int, void *);
86int	 gdb_cpu_signal(int, int);
87
88#endif /* !_MACHINE_GDB_MACHDEP_H_ */