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
52 static __inline size_t
gdb_cpu_regsz(int regnum __unused)53 gdb_cpu_regsz(int regnum __unused)
54 {
55
56 return (8);
57 }
58
59 static __inline int
gdb_cpu_query(void)60 gdb_cpu_query(void)
61 {
62 return (0);
63 }
64
65 static __inline void *
gdb_begin_write(void)66 gdb_begin_write(void)
67 {
68
69 return (NULL);
70 }
71
72 static __inline void
gdb_end_write(void * arg __unused)73 gdb_end_write(void *arg __unused)
74 {
75
76 }
77
78 static __inline void
gdb_cpu_stop_reason(int type __unused,int code __unused)79 gdb_cpu_stop_reason(int type __unused, int code __unused)
80 {
81
82 }
83
84 void *gdb_cpu_getreg(int, size_t *);
85 void gdb_cpu_setreg(int, void *);
86 int gdb_cpu_signal(int, int);
87
88 #endif /* !_MACHINE_GDB_MACHDEP_H_ */
89