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[FreeBSD/FreeBSD.git] / sys / arm64 / arm64 / db_trace.c
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 <sys/cdefs.h>
31 __FBSDID("$FreeBSD$");
32 #include <sys/param.h>
33 #include <sys/proc.h>
34 #include <sys/kdb.h>
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
43 void
44 db_md_list_watchpoints()
45 {
46
47         dbg_show_watchpoint();
48 }
49
50 int
51 db_md_clr_watchpoint(db_expr_t addr, db_expr_t size)
52 {
53
54         return (dbg_remove_watchpoint(addr, size, DBG_FROM_EL1));
55 }
56
57 int
58 db_md_set_watchpoint(db_expr_t addr, db_expr_t size)
59 {
60
61         return (dbg_setup_watchpoint(addr, size, DBG_FROM_EL1,
62             HW_BREAKPOINT_RW));
63 }
64
65 static void
66 db_stack_trace_cmd(struct unwind_state *frame)
67 {
68         c_db_sym_t sym;
69         const char *name;
70         db_expr_t value;
71         db_expr_t offset;
72
73         while (1) {
74                 uint64_t pc = frame->pc;
75                 int ret;
76
77                 ret = unwind_frame(frame);
78                 if (ret < 0)
79                         break;
80
81                 sym = db_search_symbol(pc, DB_STGY_ANY, &offset);
82                 if (sym == C_DB_SYM_NULL) {
83                         value = 0;
84                         name = "(null)";
85                 } else
86                         db_symbol_values(sym, &name, &value);
87
88                 db_printf("%s() at ", name);
89                 db_printsym(frame->pc, DB_STGY_PROC);
90                 db_printf("\n");
91
92                 db_printf("\t pc = 0x%016lx  lr = 0x%016lx\n", pc,
93                     frame->pc);
94                 db_printf("\t sp = 0x%016lx  fp = 0x%016lx\n", frame->sp,
95                     frame->fp);
96                 /* TODO: Show some more registers */
97                 db_printf("\n");
98         }
99 }
100
101 int
102 db_trace_thread(struct thread *thr, int count)
103 {
104         struct unwind_state frame;
105         struct pcb *ctx;
106
107         if (thr != curthread) {
108                 ctx = kdb_thr_ctx(thr);
109
110                 frame.sp = (uint64_t)ctx->pcb_sp;
111                 frame.fp = (uint64_t)ctx->pcb_x[29];
112                 frame.pc = (uint64_t)ctx->pcb_x[30];
113                 db_stack_trace_cmd(&frame);
114         } else
115                 db_trace_self();
116         return (0);
117 }
118
119 void
120 db_trace_self(void)
121 {
122         struct unwind_state frame;
123         uint64_t sp;
124
125         __asm __volatile("mov %0, sp" : "=&r" (sp));
126
127         frame.sp = sp;
128         frame.fp = (uint64_t)__builtin_frame_address(0);
129         frame.pc = (uint64_t)db_trace_self;
130         db_stack_trace_cmd(&frame);
131 }