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
47 static int
db_frame(struct db_variable * vp,db_expr_t * valuep,int op)48 db_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)
64 struct 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
102 struct db_variable *db_eregs = db_regs + nitems(db_regs);
103
104 void
db_show_mdpcpu(struct pcpu * pc)105 db_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 */
115 int
db_read_bytes(vm_offset_t addr,size_t size,char * data)116 db_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 */
139 int
db_write_bytes(vm_offset_t addr,size_t size,char * data)140 db_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