1/*-
2 * Copyright (c) 2015-2016 Ruslan Bukin <br@bsdpad.com>
3 * All rights reserved.
4 *
5 * Portions of this software were developed by SRI International and the
6 * University of Cambridge Computer Laboratory under DARPA/AFRL contract
7 * FA8750-10-C-0237 ("CTSRD"), as part of the DARPA CRASH research programme.
8 *
9 * Portions of this software were developed by the University of Cambridge
10 * Computer Laboratory as part of the CTSRD Project, with support from the
11 * UK Higher Education Innovation Fund (HEIF).
12 *
13 * Redistribution and use in source and binary forms, with or without
14 * modification, are permitted provided that the following conditions
15 * are met:
16 * 1. Redistributions of source code must retain the above copyright
17 *    notice, this list of conditions and the following disclaimer.
18 * 2. Redistributions in binary form must reproduce the above copyright
19 *    notice, this list of conditions and the following disclaimer in the
20 *    documentation and/or other materials provided with the distribution.
21 *
22 * THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND
23 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
24 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
25 * ARE DISCLAIMED.  IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
26 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
27 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
28 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
29 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
30 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
31 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
32 * SUCH DAMAGE.
33 *
34 * $FreeBSD$
35 */
36
37#ifndef	_MACHINE_DB_MACHDEP_H_
38#define	_MACHINE_DB_MACHDEP_H_
39
40#include <machine/riscvreg.h>
41#include <machine/frame.h>
42#include <machine/trap.h>
43
44#define	T_BREAKPOINT	(EXCP_INSTR_BREAKPOINT)
45#define	T_WATCHPOINT	(0)
46
47typedef vm_offset_t	db_addr_t;
48typedef long		db_expr_t;
49
50#define	PC_REGS()	((db_addr_t)kdb_thrctx->pcb_sepc)
51
52#define	BKPT_INST	(0x00100073)
53#define	BKPT_SIZE	(INSN_SIZE)
54#define	BKPT_SET(inst)	(BKPT_INST)
55
56#define	BKPT_SKIP do {				\
57	kdb_frame->tf_sepc += BKPT_SIZE;	\
58} while (0)
59
60#define	db_clear_single_step	kdb_cpu_clear_singlestep
61#define	db_set_single_step	kdb_cpu_set_singlestep
62
63#define	IS_BREAKPOINT_TRAP(type, code)	(type == T_BREAKPOINT)
64#define	IS_WATCHPOINT_TRAP(type, code)	(type == T_WATCHPOINT)
65
66#define	inst_trap_return(ins)	(ins == 0x10000073)	/* eret */
67#define	inst_return(ins)	(ins == 0x00008067)	/* ret */
68#define	inst_call(ins)		(((ins) & 0x7f) == 111 || \
69				 ((ins) & 0x7f) == 103) /* jal, jalr */
70
71#define	inst_load(ins) ({							\
72	uint32_t tmp_instr = db_get_value(PC_REGS(), sizeof(uint32_t), FALSE);	\
73	is_load_instr(tmp_instr);						\
74})
75
76#define	inst_store(ins) ({							\
77	uint32_t tmp_instr = db_get_value(PC_REGS(), sizeof(uint32_t), FALSE);	\
78	is_store_instr(tmp_instr);						\
79})
80
81#define	is_load_instr(ins)	(((ins) & 0x7f) == 3)
82#define	is_store_instr(ins)	(((ins) & 0x7f) == 35)
83
84#define	next_instr_address(pc, bd)	((bd) ? (pc) : ((pc) + 4))
85
86#define	DB_SMALL_VALUE_MAX	(0x7fffffff)
87#define	DB_SMALL_VALUE_MIN	(-0x40001)
88
89#define	DB_ELFSIZE		64
90
91#endif /* !_MACHINE_DB_MACHDEP_H_ */
92