1 /* $NetBSD: db_trace.c,v 1.8 2003/01/17 22:28:48 thorpej Exp $ */
2
3 /*-
4 * Copyright (c) 2000, 2001 Ben Harris
5 * Copyright (c) 1996 Scott K. Stevens
6 *
7 * Mach Operating System
8 * Copyright (c) 1991,1990 Carnegie Mellon University
9 * All Rights Reserved.
10 *
11 * Permission to use, copy, modify and distribute this software and its
12 * documentation is hereby granted, provided that both the copyright
13 * notice and this permission notice appear in all copies of the
14 * software, derivative works or modified versions, and any portions
15 * thereof, and that both notices appear in supporting documentation.
16 *
17 * CARNEGIE MELLON ALLOWS FREE USE OF THIS SOFTWARE IN ITS "AS IS"
18 * CONDITION. CARNEGIE MELLON DISCLAIMS ANY LIABILITY OF ANY KIND FOR
19 * ANY DAMAGES WHATSOEVER RESULTING FROM THE USE OF THIS SOFTWARE.
20 *
21 * Carnegie Mellon requests users of this software to return to
22 *
23 * Software Distribution Coordinator or Software.Distribution@CS.CMU.EDU
24 * School of Computer Science
25 * Carnegie Mellon University
26 * Pittsburgh PA 15213-3890
27 *
28 * any improvements or extensions that they make and grant Carnegie the
29 * rights to redistribute these changes.
30 */
31 #include "opt_ddb.h"
32
33 #include <sys/param.h>
34 #include <sys/systm.h>
35
36 #include <sys/proc.h>
37 #include <sys/kdb.h>
38 #include <sys/stack.h>
39
40 #include <machine/armreg.h>
41 #include <machine/asm.h>
42 #include <machine/cpufunc.h>
43 #include <machine/db_machdep.h>
44 #include <machine/debug_monitor.h>
45 #include <machine/pcb.h>
46 #include <machine/stack.h>
47 #include <machine/vmparam.h>
48
49 #include <ddb/ddb.h>
50 #include <ddb/db_access.h>
51 #include <ddb/db_sym.h>
52 #include <ddb/db_output.h>
53
54 static void
db_stack_trace_cmd(struct unwind_state * state)55 db_stack_trace_cmd(struct unwind_state *state)
56 {
57 const char *name;
58 db_expr_t value;
59 db_expr_t offset;
60 c_db_sym_t sym;
61 u_int reg, i;
62 char *sep;
63 uint16_t upd_mask;
64 bool finished;
65
66 finished = false;
67 while (!finished) {
68 finished = unwind_stack_one(state, 1);
69
70 /* Print the frame details */
71 sym = db_search_symbol(state->start_pc, DB_STGY_ANY, &offset);
72 if (sym == C_DB_SYM_NULL) {
73 value = 0;
74 name = "(null)";
75 } else
76 db_symbol_values(sym, &name, &value);
77 db_printf("%s() at ", name);
78 db_printsym(state->start_pc, DB_STGY_PROC);
79 db_printf("\n");
80 db_printf("\t pc = 0x%08x lr = 0x%08x (", state->start_pc,
81 state->registers[LR]);
82 db_printsym(state->registers[LR], DB_STGY_PROC);
83 db_printf(")\n");
84 db_printf("\t sp = 0x%08x fp = 0x%08x",
85 state->registers[SP], state->registers[FP]);
86
87 /* Don't print the registers we have already printed */
88 upd_mask = state->update_mask &
89 ~((1 << SP) | (1 << FP) | (1 << LR) | (1 << PC));
90 sep = "\n\t";
91 for (i = 0, reg = 0; upd_mask != 0; upd_mask >>= 1, reg++) {
92 if ((upd_mask & 1) != 0) {
93 db_printf("%s%sr%d = 0x%08x", sep,
94 (reg < 10) ? " " : "", reg,
95 state->registers[reg]);
96 i++;
97 if (i == 2) {
98 sep = "\n\t";
99 i = 0;
100 } else
101 sep = " ";
102 }
103 }
104 db_printf("\n");
105
106 if (finished)
107 break;
108
109 /*
110 * Stop if directed to do so, or if we've unwound back to the
111 * kernel entry point, or if the unwind function didn't change
112 * anything (to avoid getting stuck in this loop forever).
113 * If the latter happens, it's an indication that the unwind
114 * information is incorrect somehow for the function named in
115 * the last frame printed before you see the unwind failure
116 * message (maybe it needs a STOP_UNWINDING).
117 */
118 if (state->registers[PC] < VM_MIN_KERNEL_ADDRESS) {
119 db_printf("Unable to unwind into user mode\n");
120 finished = true;
121 } else if (state->update_mask == 0) {
122 db_printf("Unwind failure (no registers changed)\n");
123 finished = true;
124 }
125 }
126 }
127
128 void
db_md_list_watchpoints(void)129 db_md_list_watchpoints(void)
130 {
131
132 dbg_show_watchpoint();
133 }
134
135 int
db_trace_thread(struct thread * thr,int count)136 db_trace_thread(struct thread *thr, int count)
137 {
138 struct unwind_state state;
139 struct pcb *ctx;
140
141 if (thr != curthread) {
142 ctx = kdb_thr_ctx(thr);
143
144 state.registers[FP] = ctx->pcb_regs.sf_r11;
145 state.registers[SP] = ctx->pcb_regs.sf_sp;
146 state.registers[LR] = ctx->pcb_regs.sf_lr;
147 state.registers[PC] = ctx->pcb_regs.sf_pc;
148
149 db_stack_trace_cmd(&state);
150 } else
151 db_trace_self();
152 return (0);
153 }
154
155 void
db_trace_self(void)156 db_trace_self(void)
157 {
158 struct unwind_state state;
159 uint32_t sp;
160
161 /* Read the stack pointer */
162 __asm __volatile("mov %0, sp" : "=&r" (sp));
163
164 state.registers[FP] = (uint32_t)__builtin_frame_address(0);
165 state.registers[SP] = sp;
166 state.registers[LR] = (uint32_t)__builtin_return_address(0);
167 state.registers[PC] = (uint32_t)db_trace_self;
168
169 db_stack_trace_cmd(&state);
170 }
171