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/param.h>
41 #include <sys/kdb.h>
42 #include <sys/proc.h>
43
44 #include <ddb/ddb.h>
45 #include <ddb/db_sym.h>
46
47 #include <machine/pcb.h>
48 #include <machine/riscvreg.h>
49 #include <machine/stack.h>
50 #include <machine/vmparam.h>
51
52 void
db_md_list_watchpoints(void)53 db_md_list_watchpoints(void)
54 {
55
56 }
57
58 static void
db_stack_trace_cmd(struct thread * td,struct unwind_state * frame)59 db_stack_trace_cmd(struct thread *td, struct unwind_state *frame)
60 {
61 const char *name;
62 db_expr_t offset;
63 db_expr_t value;
64 c_db_sym_t sym;
65 uint64_t pc;
66
67 while (1) {
68 pc = frame->pc;
69
70 sym = db_search_symbol(pc, DB_STGY_ANY, &offset);
71 if (sym == C_DB_SYM_NULL) {
72 value = 0;
73 name = "(null)";
74 } else
75 db_symbol_values(sym, &name, &value);
76
77 db_printf("%s() at ", name);
78 db_printsym(frame->pc, DB_STGY_PROC);
79 db_printf("\n");
80
81 if (strcmp(name, "cpu_exception_handler_supervisor") == 0 ||
82 strcmp(name, "cpu_exception_handler_user") == 0) {
83 struct trapframe *tf;
84
85 tf = (struct trapframe *)(uintptr_t)frame->sp;
86 if (!__is_aligned(tf, _Alignof(struct trapframe)) ||
87 !kstack_contains(td, (vm_offset_t)tf,
88 sizeof(*tf))) {
89 db_printf("--- invalid trapframe %p\n", tf);
90 break;
91 }
92
93 if ((tf->tf_scause & SCAUSE_INTR) != 0) {
94 db_printf("--- interrupt %ld\n",
95 tf->tf_scause & SCAUSE_CODE);
96 } else if (tf->tf_scause == SCAUSE_ECALL_USER) {
97 db_printf("--- syscall");
98 db_decode_syscall(td, td->td_sa.code);
99 db_printf("\n");
100 } else {
101 db_printf("--- exception %ld, tval = %#lx\n",
102 tf->tf_scause & SCAUSE_CODE,
103 tf->tf_stval);
104 }
105 frame->sp = tf->tf_sp;
106 frame->fp = tf->tf_s[0];
107 frame->pc = tf->tf_sepc;
108 if (!INKERNEL(frame->fp))
109 break;
110 continue;
111 }
112
113 if (strcmp(name, "fork_trampoline") == 0)
114 break;
115
116 if (!unwind_frame(td, frame))
117 break;
118 }
119 }
120
121 int
db_trace_thread(struct thread * thr,int count)122 db_trace_thread(struct thread *thr, int count)
123 {
124 struct unwind_state frame;
125 struct pcb *ctx;
126
127 ctx = kdb_thr_ctx(thr);
128
129 frame.sp = ctx->pcb_sp;
130 frame.fp = ctx->pcb_s[0];
131 frame.pc = ctx->pcb_ra;
132 db_stack_trace_cmd(thr, &frame);
133 return (0);
134 }
135
136 void
db_trace_self(void)137 db_trace_self(void)
138 {
139 struct unwind_state frame;
140 uintptr_t sp;
141
142 __asm __volatile("mv %0, sp" : "=&r" (sp));
143
144 frame.sp = sp;
145 frame.fp = (uintptr_t)__builtin_frame_address(0);
146 frame.pc = (uintptr_t)db_trace_self;
147 db_stack_trace_cmd(curthread, &frame);
148 }
149