1/*-
2 * Copyright (c) 2015 The FreeBSD Foundation
3 *
4 * This software was developed by Semihalf under
5 * the sponsorship of the FreeBSD Foundation.
6 *
7 * Redistribution and use in source and binary forms, with or without
8 * modification, are permitted provided that the following conditions
9 * are met:
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#include <sys/param.h>
30#include <sys/proc.h>
31#include <vm/vm.h>
32#include <vm/pmap.h>
33#include <vm/vm_map.h>
34
35#ifdef KDB
36#include <sys/kdb.h>
37#endif
38
39#include <ddb/ddb.h>
40#include <ddb/db_variables.h>
41
42#include <machine/cpu.h>
43#include <machine/pcb.h>
44#include <machine/stack.h>
45#include <machine/vmparam.h>
46
47static int
48db_frame(struct db_variable *vp, db_expr_t *valuep, int op)
49{
50	long *reg;
51
52	if (kdb_frame == NULL)
53		return (0);
54
55	reg = (long *)((uintptr_t)kdb_frame + (db_expr_t)vp->valuep);
56	if (op == DB_VAR_GET)
57		*valuep = *reg;
58	else
59		*reg = *valuep;
60	return (1);
61}
62
63#define DB_OFFSET(x)	(db_expr_t *)offsetof(struct trapframe, x)
64struct db_variable db_regs[] = {
65	{ "ra",		DB_OFFSET(tf_ra),	db_frame },
66	{ "sp",		DB_OFFSET(tf_sp),	db_frame },
67	{ "gp",		DB_OFFSET(tf_gp),	db_frame },
68	{ "tp",		DB_OFFSET(tf_tp),	db_frame },
69	{ "t0",		DB_OFFSET(tf_t[0]),	db_frame },
70	{ "t1",		DB_OFFSET(tf_t[1]),	db_frame },
71	{ "t2",		DB_OFFSET(tf_t[2]),	db_frame },
72	{ "t3",		DB_OFFSET(tf_t[3]),	db_frame },
73	{ "t4",		DB_OFFSET(tf_t[4]),	db_frame },
74	{ "t5",		DB_OFFSET(tf_t[5]),	db_frame },
75	{ "t6",		DB_OFFSET(tf_t[6]),	db_frame },
76	{ "s0",		DB_OFFSET(tf_s[0]),	db_frame },
77	{ "s1",		DB_OFFSET(tf_s[1]),	db_frame },
78	{ "s2",		DB_OFFSET(tf_s[2]),	db_frame },
79	{ "s3",		DB_OFFSET(tf_s[3]),	db_frame },
80	{ "s4",		DB_OFFSET(tf_s[4]),	db_frame },
81	{ "s5",		DB_OFFSET(tf_s[5]),	db_frame },
82	{ "s6",		DB_OFFSET(tf_s[6]),	db_frame },
83	{ "s7",		DB_OFFSET(tf_s[7]),	db_frame },
84	{ "s8",		DB_OFFSET(tf_s[8]),	db_frame },
85	{ "s9",		DB_OFFSET(tf_s[9]),	db_frame },
86	{ "s10",	DB_OFFSET(tf_s[10]),	db_frame },
87	{ "s11",	DB_OFFSET(tf_s[11]),	db_frame },
88	{ "a0",		DB_OFFSET(tf_a[0]),	db_frame },
89	{ "a1",		DB_OFFSET(tf_a[1]),	db_frame },
90	{ "a2",		DB_OFFSET(tf_a[2]),	db_frame },
91	{ "a3",		DB_OFFSET(tf_a[3]),	db_frame },
92	{ "a4",		DB_OFFSET(tf_a[4]),	db_frame },
93	{ "a5",		DB_OFFSET(tf_a[5]),	db_frame },
94	{ "a6",		DB_OFFSET(tf_a[6]),	db_frame },
95	{ "a7",		DB_OFFSET(tf_a[7]),	db_frame },
96	{ "sepc",	DB_OFFSET(tf_sepc),	db_frame },
97	{ "sstatus",	DB_OFFSET(tf_sstatus),	db_frame },
98	{ "stval",	DB_OFFSET(tf_stval),	db_frame },
99	{ "scause",	DB_OFFSET(tf_scause),	db_frame },
100};
101
102struct db_variable *db_eregs = db_regs + nitems(db_regs);
103
104void
105db_show_mdpcpu(struct pcpu *pc)
106{
107	db_printf("curpmap      = %p\n", pc->pc_curpmap);
108	db_printf("pending_ipis = %x\n", pc->pc_pending_ipis);
109	db_printf("hart         = %u\n", pc->pc_hart);
110}
111
112/*
113 * Read bytes from kernel address space for debugger.
114 */
115int
116db_read_bytes(vm_offset_t addr, size_t size, char *data)
117{
118	jmp_buf jb;
119	void *prev_jb;
120	const char *src;
121	int ret;
122
123	prev_jb = kdb_jmpbuf(jb);
124	ret = setjmp(jb);
125
126	if (ret == 0) {
127		src = (const char *)addr;
128		while (size-- > 0)
129			*data++ = *src++;
130	}
131	(void)kdb_jmpbuf(prev_jb);
132
133	return (ret);
134}
135
136/*
137 * Write bytes to kernel address space for debugger.
138 */
139int
140db_write_bytes(vm_offset_t addr, size_t size, char *data)
141{
142	jmp_buf jb;
143	void *prev_jb;
144	char *dst;
145	int ret;
146
147	prev_jb = kdb_jmpbuf(jb);
148	ret = setjmp(jb);
149	if (ret == 0) {
150		dst = (char *)addr;
151		while (size-- > 0)
152			*dst++ = *data++;
153
154		/* Invalidate I-cache */
155		fence_i();
156	}
157	(void)kdb_jmpbuf(prev_jb);
158
159	return (ret);
160}
161