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 "opt_ddb.h"
30
31 #include <sys/param.h>
32 #include <sys/proc.h>
33 #include <sys/kdb.h>
34
35 #include <machine/pcb.h>
36 #include <ddb/ddb.h>
37 #include <ddb/db_sym.h>
38
39 #include <machine/armreg.h>
40 #include <machine/debug_monitor.h>
41 #include <machine/stack.h>
42 #include <machine/vmparam.h>
43
44 #define FRAME_NORMAL 0
45 #define FRAME_SYNC 1
46 #define FRAME_IRQ 2
47 #define FRAME_SERROR 3
48 #define FRAME_UNHANDLED 4
49
50 void
db_md_list_breakpoints(void)51 db_md_list_breakpoints(void)
52 {
53
54 dbg_show_breakpoint();
55 }
56
57 void
db_md_list_watchpoints(void)58 db_md_list_watchpoints(void)
59 {
60
61 dbg_show_watchpoint();
62 }
63
64 static void __nosanitizeaddress
db_stack_trace_cmd(struct thread * td,struct unwind_state * frame)65 db_stack_trace_cmd(struct thread *td, struct unwind_state *frame)
66 {
67 c_db_sym_t sym;
68 const char *name;
69 db_expr_t value;
70 db_expr_t offset;
71 int frame_type;
72
73 while (1) {
74 sym = db_search_symbol(frame->pc, DB_STGY_ANY, &offset);
75 if (sym == C_DB_SYM_NULL) {
76 value = 0;
77 name = "(null)";
78 } else
79 db_symbol_values(sym, &name, &value);
80
81 db_printf("%s() at ", name);
82 db_printsym(frame->pc, DB_STGY_PROC);
83 db_printf("\n");
84
85 if (strcmp(name, "handle_el0_sync") == 0 ||
86 strcmp(name, "handle_el1h_sync") == 0)
87 frame_type = FRAME_SYNC;
88 else if (strcmp(name, "handle_el0_irq") == 0 ||
89 strcmp(name, "handle_el1h_irq") == 0)
90 frame_type = FRAME_IRQ;
91 else if (strcmp(name, "handle_serror") == 0)
92 frame_type = FRAME_SERROR;
93 else if (strcmp(name, "handle_empty_exception") == 0)
94 frame_type = FRAME_UNHANDLED;
95 else
96 frame_type = FRAME_NORMAL;
97
98 if (frame_type != FRAME_NORMAL) {
99 struct trapframe *tf;
100
101 tf = (struct trapframe *)(uintptr_t)frame->fp - 1;
102 if (!__is_aligned(tf, _Alignof(struct trapframe)) ||
103 !kstack_contains(td, (vm_offset_t)tf,
104 sizeof(*tf))) {
105 db_printf("--- invalid trapframe %p\n", tf);
106 break;
107 }
108
109 switch (frame_type) {
110 case FRAME_SYNC:
111 db_printf("--- exception, esr %#lx\n",
112 tf->tf_esr);
113 break;
114 case FRAME_IRQ:
115 db_printf("--- interrupt\n");
116 break;
117 case FRAME_SERROR:
118 db_printf("--- system error, esr %#lx\n",
119 tf->tf_esr);
120 break;
121 case FRAME_UNHANDLED:
122 db_printf("--- unhandled exception, esr %#lx\n",
123 tf->tf_esr);
124 break;
125 default:
126 __assert_unreachable();
127 break;
128 }
129
130 frame->fp = tf->tf_x[29];
131 frame->pc = ADDR_MAKE_CANONICAL(tf->tf_elr);
132 if (!INKERNEL(frame->fp))
133 break;
134 } else {
135 if (strcmp(name, "fork_trampoline") == 0)
136 break;
137
138 if (!unwind_frame(td, frame))
139 break;
140 }
141 }
142 }
143
144 int __nosanitizeaddress
db_trace_thread(struct thread * thr,int count)145 db_trace_thread(struct thread *thr, int count)
146 {
147 struct unwind_state frame;
148 struct pcb *ctx;
149
150 if (thr != curthread) {
151 ctx = kdb_thr_ctx(thr);
152
153 frame.fp = (uintptr_t)ctx->pcb_x[PCB_FP];
154 frame.pc = (uintptr_t)ctx->pcb_x[PCB_LR];
155 db_stack_trace_cmd(thr, &frame);
156 } else
157 db_trace_self();
158 return (0);
159 }
160
161 void __nosanitizeaddress
db_trace_self(void)162 db_trace_self(void)
163 {
164 struct unwind_state frame;
165
166 frame.fp = (uintptr_t)__builtin_frame_address(0);
167 frame.pc = (uintptr_t)db_trace_self;
168 db_stack_trace_cmd(curthread, &frame);
169 }
170