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