1 /*-
2 * Copyright (c) 2015 The FreeBSD Foundation
3 * Copyright (c) 2016 Ruslan Bukin <br@bsdpad.com>
4 * All rights reserved.
5 * Copyright (c) 2020 John Baldwin <jhb@FreeBSD.org>
6 *
7 * Portions of this software were developed by Semihalf under
8 * the sponsorship of the FreeBSD Foundation.
9 *
10 * Portions of this software were developed by SRI International and the
11 * University of Cambridge Computer Laboratory under DARPA/AFRL contract
12 * FA8750-10-C-0237 ("CTSRD"), as part of the DARPA CRASH research programme.
13 *
14 * Portions of this software were developed by the University of Cambridge
15 * Computer Laboratory as part of the CTSRD Project, with support from the
16 * UK Higher Education Innovation Fund (HEIF).
17 *
18 * Redistribution and use in source and binary forms, with or without
19 * modification, are permitted provided that the following conditions
20 * are met:
21 * 1. Redistributions of source code must retain the above copyright
22 * notice, this list of conditions and the following disclaimer.
23 * 2. Redistributions in binary form must reproduce the above copyright
24 * notice, this list of conditions and the following disclaimer in the
25 * documentation and/or other materials provided with the distribution.
26 *
27 * THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND
28 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
29 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
30 * ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
31 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
32 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
33 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
34 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
35 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
36 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
37 * SUCH DAMAGE.
38 */
39
40 #include <sys/cdefs.h>
41 __FBSDID("$FreeBSD$");
42
43 #include <sys/param.h>
44 #include <sys/kdb.h>
45 #include <sys/proc.h>
46
47 #include <ddb/ddb.h>
48 #include <ddb/db_sym.h>
49
50 #include <machine/pcb.h>
51 #include <machine/riscvreg.h>
52 #include <machine/stack.h>
53 #include <machine/vmparam.h>
54
55 void
56 db_md_list_watchpoints(void)
57 {
58
59 }
60
61 int
62 db_md_clr_watchpoint(db_expr_t addr, db_expr_t size)
63 {
64
65 return (0);
66 }
67
68 int
69 db_md_set_watchpoint(db_expr_t addr, db_expr_t size)
70 {
71
72 return (0);
73 }
74
75 static void
76 db_stack_trace_cmd(struct unwind_state *frame)
77 {
78 const char *name;
79 db_expr_t offset;
80 db_expr_t value;
81 c_db_sym_t sym;
82 uint64_t pc;
83
84 while (1) {
85 pc = frame->pc;
86
87 sym = db_search_symbol(pc, DB_STGY_ANY, &offset);
88 if (sym == C_DB_SYM_NULL) {
89 value = 0;
90 name = "(null)";
91 } else
92 db_symbol_values(sym, &name, &value);
93
94 db_printf("%s() at ", name);
95 db_printsym(frame->pc, DB_STGY_PROC);
96 db_printf("\n");
97
98 if (strcmp(name, "cpu_exception_handler_supervisor") == 0 ||
99 strcmp(name, "cpu_exception_handler_user") == 0) {
100 struct trapframe *tf;
101
102 tf = (struct trapframe *)(uintptr_t)frame->sp;
103
104 if (tf->tf_scause & EXCP_INTR)
105 db_printf("--- interrupt %ld\n",
106 tf->tf_scause & EXCP_MASK);
107 else
108 db_printf("--- exception %ld, tval = %#lx\n",
109 tf->tf_scause & EXCP_MASK,
110 tf->tf_stval);
111 frame->sp = (uint64_t)tf->tf_sp;
112 frame->fp = (uint64_t)tf->tf_s[0];
113 frame->pc = (uint64_t)tf->tf_sepc;
114 if (!INKERNEL(frame->fp))
115 break;
116 continue;
117 }
118
119 if (strcmp(name, "fork_trampoline") == 0)
120 break;
121
122 if (unwind_frame(frame) < 0)
123 break;
124 }
125 }
126
127 int
128 db_trace_thread(struct thread *thr, int count)
129 {
130 struct unwind_state frame;
131 struct pcb *ctx;
132
133 ctx = kdb_thr_ctx(thr);
134
135 frame.sp = (uint64_t)ctx->pcb_sp;
136 frame.fp = (uint64_t)ctx->pcb_s[0];
137 frame.pc = (uint64_t)ctx->pcb_ra;
138 db_stack_trace_cmd(&frame);
139 return (0);
140 }
141
142 void
143 db_trace_self(void)
144 {
145 struct unwind_state frame;
146 uint64_t sp;
147
148 __asm __volatile("mv %0, sp" : "=&r" (sp));
149
150 frame.sp = sp;
151 frame.fp = (uint64_t)__builtin_frame_address(0);
152 frame.pc = (uint64_t)db_trace_self;
153 db_stack_trace_cmd(&frame);
154 }
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