1 /*-
2 * Copyright (c) 2015 The FreeBSD Foundation
3 * Copyright (c) 2016 Ruslan Bukin <br@bsdpad.com>
4 * All rights reserved.
5 *
6 * Portions of this software were developed by Semihalf under
7 * the sponsorship of the FreeBSD Foundation.
8 *
9 * Portions of this software were developed by SRI International and the
10 * University of Cambridge Computer Laboratory under DARPA/AFRL contract
11 * FA8750-10-C-0237 ("CTSRD"), as part of the DARPA CRASH research programme.
12 *
13 * Portions of this software were developed by the University of Cambridge
14 * Computer Laboratory as part of the CTSRD Project, with support from the
15 * UK Higher Education Innovation Fund (HEIF).
16 *
17 * Redistribution and use in source and binary forms, with or without
18 * modification, are permitted provided that the following conditions
19 * are met:
20 * 1. Redistributions of source code must retain the above copyright
21 * notice, this list of conditions and the following disclaimer.
22 * 2. Redistributions in binary form must reproduce the above copyright
23 * notice, this list of conditions and the following disclaimer in the
24 * documentation and/or other materials provided with the distribution.
25 *
26 * THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND
27 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
28 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
29 * ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
30 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
31 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
32 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
33 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
34 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
35 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
36 * SUCH DAMAGE.
37 */
38
39 #include <sys/cdefs.h>
40 __FBSDID("$FreeBSD: releng/12.0/sys/riscv/riscv/db_trace.c 296614 2016-03-10 15:51:43Z br $");
41 #include <sys/param.h>
42 #include <sys/proc.h>
43 #include <sys/kdb.h>
44 #include <machine/pcb.h>
45 #include <ddb/ddb.h>
46 #include <ddb/db_sym.h>
47
48 #include <machine/riscvreg.h>
49 #include <machine/stack.h>
50
51 void
52 db_md_list_watchpoints()
53 {
54
55 }
56
57 int
58 db_md_clr_watchpoint(db_expr_t addr, db_expr_t size)
59 {
60
61 return (0);
62 }
63
64 int
65 db_md_set_watchpoint(db_expr_t addr, db_expr_t size)
66 {
67
68 return (0);
69 }
70
71 static void
72 db_stack_trace_cmd(struct unwind_state *frame)
73 {
74 const char *name;
75 db_expr_t offset;
76 db_expr_t value;
77 c_db_sym_t sym;
78 uint64_t pc;
79
80 while (1) {
81 pc = frame->pc;
82
83 if (unwind_frame(frame) < 0)
84 break;
85
86 sym = db_search_symbol(pc, DB_STGY_ANY, &offset);
87 if (sym == C_DB_SYM_NULL) {
88 value = 0;
89 name = "(null)";
90 } else
91 db_symbol_values(sym, &name, &value);
92
93 db_printf("%s() at ", name);
94 db_printsym(frame->pc, DB_STGY_PROC);
95 db_printf("\n");
96
97 db_printf("\t pc = 0x%016lx ra = 0x%016lx\n",
98 pc, frame->pc);
99 db_printf("\t sp = 0x%016lx fp = 0x%016lx\n",
100 frame->sp, frame->fp);
101 db_printf("\n");
102 }
103 }
104
105 int
106 db_trace_thread(struct thread *thr, int count)
107 {
108 struct unwind_state frame;
109 struct pcb *ctx;
110
111 if (thr != curthread) {
112 ctx = kdb_thr_ctx(thr);
113
114 frame.sp = (uint64_t)ctx->pcb_sp;
115 frame.fp = (uint64_t)ctx->pcb_s[0];
116 frame.pc = (uint64_t)ctx->pcb_ra;
117 db_stack_trace_cmd(&frame);
118 } else
119 db_trace_self();
120 return (0);
121 }
122
123 void
124 db_trace_self(void)
125 {
126 struct unwind_state frame;
127 uint64_t sp;
128
129 __asm __volatile("mv %0, sp" : "=&r" (sp));
130
131 frame.sp = sp;
132 frame.fp = (uint64_t)__builtin_frame_address(0);
133 frame.pc = (uint64_t)db_trace_self;
134 db_stack_trace_cmd(&frame);
135 }
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