1 /* $NetBSD: db_trace.c,v 1.8 2003/01/17 22:28:48 thorpej Exp $ */
4 * Copyright (c) 2000, 2001 Ben Harris
5 * Copyright (c) 1996 Scott K. Stevens
7 * Mach Operating System
8 * Copyright (c) 1991,1990 Carnegie Mellon University
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.
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.
21 * Carnegie Mellon requests users of this software to return to
23 * Software Distribution Coordinator or Software.Distribution@CS.CMU.EDU
24 * School of Computer Science
25 * Carnegie Mellon University
26 * Pittsburgh PA 15213-3890
28 * any improvements or extensions that they make and grant Carnegie the
29 * rights to redistribute these changes.
33 #include <sys/cdefs.h>
34 __FBSDID("$FreeBSD$");
35 #include <sys/param.h>
36 #include <sys/systm.h>
40 #include <sys/stack.h>
42 #include <machine/armreg.h>
43 #include <machine/asm.h>
44 #include <machine/cpufunc.h>
45 #include <machine/db_machdep.h>
46 #include <machine/debug_monitor.h>
47 #include <machine/pcb.h>
48 #include <machine/stack.h>
49 #include <machine/vmparam.h>
52 #include <ddb/db_access.h>
53 #include <ddb/db_sym.h>
54 #include <ddb/db_output.h>
57 db_stack_trace_cmd(struct unwind_state *state)
70 finished = unwind_stack_one(state, 1);
72 /* Print the frame details */
73 sym = db_search_symbol(state->start_pc, DB_STGY_ANY, &offset);
74 if (sym == C_DB_SYM_NULL) {
78 db_symbol_values(sym, &name, &value);
79 db_printf("%s() at ", name);
80 db_printsym(state->start_pc, DB_STGY_PROC);
82 db_printf("\t pc = 0x%08x lr = 0x%08x (", state->start_pc,
83 state->registers[LR]);
84 db_printsym(state->registers[LR], DB_STGY_PROC);
86 db_printf("\t sp = 0x%08x fp = 0x%08x",
87 state->registers[SP], state->registers[FP]);
89 /* Don't print the registers we have already printed */
90 upd_mask = state->update_mask &
91 ~((1 << SP) | (1 << FP) | (1 << LR) | (1 << PC));
93 for (i = 0, reg = 0; upd_mask != 0; upd_mask >>= 1, reg++) {
94 if ((upd_mask & 1) != 0) {
95 db_printf("%s%sr%d = 0x%08x", sep,
96 (reg < 10) ? " " : "", reg,
97 state->registers[reg]);
112 * Stop if directed to do so, or if we've unwound back to the
113 * kernel entry point, or if the unwind function didn't change
114 * anything (to avoid getting stuck in this loop forever).
115 * If the latter happens, it's an indication that the unwind
116 * information is incorrect somehow for the function named in
117 * the last frame printed before you see the unwind failure
118 * message (maybe it needs a STOP_UNWINDING).
120 if (state->registers[PC] < VM_MIN_KERNEL_ADDRESS) {
121 db_printf("Unable to unwind into user mode\n");
123 } else if (state->update_mask == 0) {
124 db_printf("Unwind failure (no registers changed)\n");
131 db_md_list_watchpoints(void)
134 dbg_show_watchpoint();
138 db_trace_thread(struct thread *thr, int count)
140 struct unwind_state state;
143 if (thr != curthread) {
144 ctx = kdb_thr_ctx(thr);
146 state.registers[FP] = ctx->pcb_regs.sf_r11;
147 state.registers[SP] = ctx->pcb_regs.sf_sp;
148 state.registers[LR] = ctx->pcb_regs.sf_lr;
149 state.registers[PC] = ctx->pcb_regs.sf_pc;
151 db_stack_trace_cmd(&state);
160 struct unwind_state state;
163 /* Read the stack pointer */
164 __asm __volatile("mov %0, sp" : "=&r" (sp));
166 state.registers[FP] = (uint32_t)__builtin_frame_address(0);
167 state.registers[SP] = sp;
168 state.registers[LR] = (uint32_t)__builtin_return_address(0);
169 state.registers[PC] = (uint32_t)db_trace_self;
171 db_stack_trace_cmd(&state);