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 #include <sys/param.h> 33 #include <sys/proc.h> 34 #include <sys/kdb.h> 35 36 #include <machine/pcb.h> 37 #include <ddb/ddb.h> 38 #include <ddb/db_sym.h> 39 40 #include <machine/armreg.h> 41 #include <machine/debug_monitor.h> 42 #include <machine/stack.h> 43 #include <machine/vmparam.h> 44 45 #define FRAME_NORMAL 0 46 #define FRAME_SYNC 1 47 #define FRAME_IRQ 2 48 #define FRAME_SERROR 3 49 #define FRAME_UNHANDLED 4 50 51 void 52 db_md_list_watchpoints(void) 53 { 54 55 dbg_show_watchpoint(); 56 } 57 58 static void __nosanitizeaddress 59 db_stack_trace_cmd(struct thread *td, struct unwind_state *frame) 60 { 61 c_db_sym_t sym; 62 const char *name; 63 db_expr_t value; 64 db_expr_t offset; 65 int frame_type; 66 67 while (1) { 68 sym = db_search_symbol(frame->pc, DB_STGY_ANY, &offset); 69 if (sym == C_DB_SYM_NULL) { 70 value = 0; 71 name = "(null)"; 72 } else 73 db_symbol_values(sym, &name, &value); 74 75 db_printf("%s() at ", name); 76 db_printsym(frame->pc, DB_STGY_PROC); 77 db_printf("\n"); 78 79 if (strcmp(name, "handle_el0_sync") == 0 || 80 strcmp(name, "handle_el1h_sync") == 0) 81 frame_type = FRAME_SYNC; 82 else if (strcmp(name, "handle_el0_irq") == 0 || 83 strcmp(name, "handle_el1h_irq") == 0) 84 frame_type = FRAME_IRQ; 85 else if (strcmp(name, "handle_serror") == 0) 86 frame_type = FRAME_SERROR; 87 else if (strcmp(name, "handle_empty_exception") == 0) 88 frame_type = FRAME_UNHANDLED; 89 else 90 frame_type = FRAME_NORMAL; 91 92 if (frame_type != FRAME_NORMAL) { 93 struct trapframe *tf; 94 95 tf = (struct trapframe *)(uintptr_t)frame->fp - 1; 96 if (!__is_aligned(tf, _Alignof(*tf)) || 97 !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 %#lx\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 %#lx\n", 113 tf->tf_esr); 114 break; 115 case FRAME_UNHANDLED: 116 db_printf("--- unhandled exception, esr %#lx\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 __nosanitizeaddress 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[PCB_FP]; 148 frame.pc = (uintptr_t)ctx->pcb_x[PCB_LR]; 149 db_stack_trace_cmd(thr, &frame); 150 } else 151 db_trace_self(); 152 return (0); 153 } 154 155 void __nosanitizeaddress 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