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