1/*-
2 * Copyright (c) 2015 The FreeBSD Foundation
3 * All rights reserved.
4 *
5 * This software was developed by Semihalf under
6 * the sponsorship of the FreeBSD Foundation.
7 *
8 * Redistribution and use in source and binary forms, with or without
9 * modification, are permitted provided that the following conditions
10 * are met:
11 * 1. Redistributions of source code must retain the above copyright
12 *    notice, this list of conditions and the following disclaimer.
13 * 2. Redistributions in binary form must reproduce the above copyright
14 *    notice, this list of conditions and the following disclaimer in the
15 *    documentation and/or other materials provided with the distribution.
16 *
17 * THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND
18 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
19 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
20 * ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
21 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
22 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
23 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
24 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
25 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
26 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
27 * SUCH DAMAGE.
28 */
29
30#include <sys/cdefs.h>
31__FBSDID("$FreeBSD$");
32#include <sys/param.h>
33#include <sys/proc.h>
34#include <vm/vm.h>
35#include <vm/pmap.h>
36#include <vm/vm_map.h>
37
38#ifdef KDB
39#include <sys/kdb.h>
40#endif
41
42#include <ddb/ddb.h>
43#include <ddb/db_variables.h>
44
45#include <machine/cpu.h>
46#include <machine/pcb.h>
47#include <machine/stack.h>
48#include <machine/vmparam.h>
49
50static int
51db_frame(struct db_variable *vp, db_expr_t *valuep, int op)
52{
53	long *reg;
54
55	if (kdb_frame == NULL)
56		return (0);
57
58	reg = (long *)((uintptr_t)kdb_frame + (db_expr_t)vp->valuep);
59	if (op == DB_VAR_GET)
60		*valuep = *reg;
61	else
62		*reg = *valuep;
63	return (1);
64}
65
66#define DB_OFFSET(x)	(db_expr_t *)offsetof(struct trapframe, x)
67struct db_variable db_regs[] = {
68	{ "spsr", DB_OFFSET(tf_spsr),	db_frame },
69	{ "x0", DB_OFFSET(tf_x[0]),	db_frame },
70	{ "x1", DB_OFFSET(tf_x[1]),	db_frame },
71	{ "x2", DB_OFFSET(tf_x[2]),	db_frame },
72	{ "x3", DB_OFFSET(tf_x[3]),	db_frame },
73	{ "x4", DB_OFFSET(tf_x[4]),	db_frame },
74	{ "x5", DB_OFFSET(tf_x[5]),	db_frame },
75	{ "x6", DB_OFFSET(tf_x[6]),	db_frame },
76	{ "x7", DB_OFFSET(tf_x[7]),	db_frame },
77	{ "x8", DB_OFFSET(tf_x[8]),	db_frame },
78	{ "x9", DB_OFFSET(tf_x[9]),	db_frame },
79	{ "x10", DB_OFFSET(tf_x[10]),	db_frame },
80	{ "x11", DB_OFFSET(tf_x[11]),	db_frame },
81	{ "x12", DB_OFFSET(tf_x[12]),	db_frame },
82	{ "x13", DB_OFFSET(tf_x[13]),	db_frame },
83	{ "x14", DB_OFFSET(tf_x[14]),	db_frame },
84	{ "x15", DB_OFFSET(tf_x[15]),	db_frame },
85	{ "x16", DB_OFFSET(tf_x[16]),	db_frame },
86	{ "x17", DB_OFFSET(tf_x[17]),	db_frame },
87	{ "x18", DB_OFFSET(tf_x[18]),	db_frame },
88	{ "x19", DB_OFFSET(tf_x[19]),	db_frame },
89	{ "x20", DB_OFFSET(tf_x[20]),	db_frame },
90	{ "x21", DB_OFFSET(tf_x[21]),	db_frame },
91	{ "x22", DB_OFFSET(tf_x[22]),	db_frame },
92	{ "x23", DB_OFFSET(tf_x[23]),	db_frame },
93	{ "x24", DB_OFFSET(tf_x[24]),	db_frame },
94	{ "x25", DB_OFFSET(tf_x[25]),	db_frame },
95	{ "x26", DB_OFFSET(tf_x[26]),	db_frame },
96	{ "x27", DB_OFFSET(tf_x[27]),	db_frame },
97	{ "x28", DB_OFFSET(tf_x[28]),	db_frame },
98	{ "x29", DB_OFFSET(tf_x[29]),	db_frame },
99	{ "lr", DB_OFFSET(tf_lr),	db_frame },
100	{ "elr", DB_OFFSET(tf_elr),	db_frame },
101	{ "sp", DB_OFFSET(tf_sp), db_frame },
102};
103
104struct db_variable *db_eregs = db_regs + nitems(db_regs);
105
106void
107db_show_mdpcpu(struct pcpu *pc)
108{
109}
110
111/*
112 * Read bytes from kernel address space for debugger.
113 */
114int
115db_read_bytes(vm_offset_t addr, size_t size, char *data)
116{
117	jmp_buf jb;
118	void *prev_jb;
119	const char *src;
120	int ret;
121
122	prev_jb = kdb_jmpbuf(jb);
123	ret = setjmp(jb);
124
125	if (ret == 0) {
126		src = (const char *)addr;
127		while (size-- > 0)
128			*data++ = *src++;
129	}
130	(void)kdb_jmpbuf(prev_jb);
131
132	return (ret);
133}
134
135/*
136 * Write bytes to kernel address space for debugger.
137 */
138int
139db_write_bytes(vm_offset_t addr, size_t size, char *data)
140{
141	jmp_buf jb;
142	void *prev_jb;
143	char *dst;
144	int ret;
145
146	prev_jb = kdb_jmpbuf(jb);
147	ret = setjmp(jb);
148	if (ret == 0) {
149		dst = (char *)addr;
150		while (size-- > 0)
151			*dst++ = *data++;
152
153		dsb(ish);
154
155		/* Clean D-cache and invalidate I-cache */
156		cpu_dcache_wb_range(addr, (vm_size_t)size);
157		cpu_icache_sync_range(addr, (vm_size_t)size);
158	}
159	(void)kdb_jmpbuf(prev_jb);
160
161	return (ret);
162}
163